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Ikin Fluid attended the 2020 Bauma China

June 30, 2021June 29, 2021 by 爱金流体

Look back the 2020 Bauma China, Shanghai

On November 27th, the 4-days Bauma China Shanghai 2020 ended successfully.

Despite the impact of the covid pandemic, as well as four consecutive days of rainy, enthusiasm of the construction machinery industry still can not be stopped.

The major construction machinery companies showed their abilities and the creativity of the event dominated the audience.

The exhibitors showed more pleasantly surprise, with many bright spots.

Sany's "Online Bauma Show" becomes a new IP 23.5 billion signed orders!

The debut of the new product witnessed the strength of the “Trinity Steel Corps”.

C10 series new pump truck with comprehensive regulations and the longest boom
The new hundred-ton large excavator SY1250H
46 models of Sany’s latest equipment from 25 tons to 800 tons cranes
Unmanned road roller without cab
The world’s first plug-in hybrid paver
The world’s first mass-produced electric excavators and other dozens of the most cutting-edge products, all in full attack, stunning the audience!

And the below picture shows IKIN’s test coupling used in the Sany crane hydraulic system on the Bauma Exihibition.

The following is the live shooting at Sany’s booth. It is our IKIN hydraulic test coupling used on Sany crane.

We IKIN FLUID are serious at designing and manufacturing hydraulic test points.

Tee Hydraulic Test Coupling manufacturer in China

What is the common leakage problems and possible causes of Hydraulic Testings?

March 8, 2021

XCMG "Steel Corps" convergence Full of "Chinese Wisdom"

XCMG Group launched the global digital spare parts service information system (XCMG-Global Service System, referred to as X-GSS)”.

Promote digital, intelligent, and unmanned transformation and upgrading.

Again, IKIN FLUID pressure check test point is used in the XCMG’s booth.

Zoomlion signed over 9 billion RMB on the first day, the new product witnessed the world's most.

Zoomlion’s world’s highest self-propelled straight arm aerial work platform ZT68J
Zoomlion exhibited many “black technology” products
New high-tech products of Zoomlion，all demonstrate strong R&D and innovation capabilities.

The following picture shows the application of IKIN pressure test points, taken at the booth of Zoomlion:

In addition, below is the pressure test coupling used in many other customers booth exhibits.

Affected by the epidemic, the number of customers to participate in the show than in 2018 year has decreased, but many customers still come to the party.

The professional exhibits, with a sense of science and technology carefully prepared by IKIN, have attracted the attention of many customers.

Booth of IKIN

who we are?

China manufacturer
supplier for Sany Crane, XCMG Group, Zoomlion, GE and so on inbroad
specialize in hydrauli test fittings
reliable, high cost performanc

what do we manufacture?

hydraulic fittings, customized for pressure system

90°&45° hose fitting

microbore hose fittings, with ORFS female thread

microbore hose fittings, with ORFS male thread

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pressure test kit

Contact us, tell us your needs in hydraulic test！

what are the types of Hydraulic hose fittings and failure analysis？

September 6, 2021April 29, 2021 by 爱金流体

Hydraulic Hose Fitting with Banjo fitting manufacturer in China

Top 3 Manufacturer in China

hydraulic test point hose supplier

SGS Approved

what are the types of Hydraulic hose assembly and fittings？

With the rapid development of China’s construction machinery, the reliability of hydraulic hose assemblies has become one of the most concerned issues in the industry.

The hydraulic hose assembly is a basic element in the hydraulic transmission system. The quality of the hose assembly directly affects the performance of the hydraulic system and the main engine. Part of the failure of the hose assembly comes from the structure of the joint core.

The hose connector core is mainly divided into two parts, one is the connection structure, mostly based on SAE standards, ISO standards and KES standards; The other part is the structure of the crimping part (tail structure), which is matched with the outer jacket and the inner and outer rubber layers of the hose to form a reliable crimping deformation to meet the performance of the hose assembly.

If the structure of the joint core crimping part is unreasonable in the design of different types of hoses, product quality problems will occur to a large extent.

Therefore, the types of (designed) joint cores selected for hoses in different working environments are also different, and a reasonable design can avoid or reduce the occurrence of failures.

1. Types and characteristics of hose fittings

Throughout the entire hose assembly industry, there are mainly two types of reliable connections between hose joints and hoses: full withhold hose joints and detachable hose joints.

The full crimping joint is a process in which the eight-part crimping module of the crimping machine uniformly squeezes the hose joint to a certain extent after assembling the joint core, hose and outer jacket, so that the hose joint and the hose become a whole.

The detachable hose connector compresses the hose through the connector core with the outer cone and the connector core, so that the hose is close to the inner cone of the connector sleeve, forming a connection with a greater binding force.

1.1 Hose crimping form and characteristics

The type of withholding of the hose mainly depends on the type of hose (or the size of the inner and outer rubber) and the pressure environment of the hose assembly.

It is mainly divided into three categories: non-peeling rubber crimping, peeling outer rubber crimping, and inner and outer rubber peeling crimping.

The characteristics of each type are:

(1) Non-peeling and crimping: The inner and outer rubber of the hose does not need to be stripped, and the product can be completed by crimping after the hose is installed. The processing technology is simple.

This type of crimping is often used for steel wire braided hoses with relatively thin outer rubber layers such as GB/T3683, EN853 and SAE standards.

(2) Stripping and crimping: It is necessary to strip off the outer rubber layer of the hose to a certain length (the outer rubber layer is thicker), which is used to better make the steel wire reinforcement layer contact with the tooth groove of the jacket.

When the jacket shrinks and deforms under external force, it will firmly buckle the steel wire, thereby preventing the joint from pulling out when subjected to high pressure impact.

This type of crimping is mainly applicable to steel wire wound hoses such as GB/T10544, EN856, and SAE standards.

(3) Internal and external rubber stripping and crimping: the inner and outer rubber layers need to be stripped to a certain length (the thickness of the inner and outer rubber), the steel wire layer and the inner rubber layer are extruded into a wave shape, generally suitable for GB/T10544, EN856-R13, R15, etc. Specifications (32 or more including 32) ultra-high pressure steel wire spiral hose.

1.2. Withholding type hose connector

Withholding type hose joint is mainly composed of joint core, outer jacket (nut is an optional part) and other parts.

1) Joint core materials, types and characteristics

Commonly materials used for joint cores are 20, 35, and 45 steels. For straight joint cores, 35 and 45 steels are often used, which have strong resistance to deformation. Considering the manufacturability of bending joint cores, 20 or 35 steels are generally used.

With the popularization of hot bending technology, 35 and 45 steels can also be used for elbow joint cores.

The structural characteristics of the joint core are closely related to the hose crimping form, and according to the regularity of the structure, the types of joint cores are roughly divided into: zigzag structure, rectangular structure, internal locking structure, etc.

(1) Sawtooth structure joint core, commonly known as barbed type, is mainly composed of sawtooth grooves, and the angle between the hypotenuse and the axis is generally not more than 20°.

The top of the serration is arc-shaped or flat, and the plane and the short side of the serration are smooth rounded corners (0.2~0.5mm) to prevent damage to the inner rubber layer of the hose during assembly and crimping.

The joint core of this structure has strong sealing and pull-off resistance, and is mainly used for steel wire-wound rubber hoses.

(2) Rectangular structure joint core: mainly composed of several rectangular grooves, 5~7 groove bodies form a sealing groove, and the groove depth is generally 0.3~0.6mm.

The transition surface between the top of the groove and the bottom of the groove is generally smooth with rounded corners, with a radius of 0.1mm~0.3mm.

Prevent damage to the inner rubber layer of the hose during assembly and crimping. The overall structure is simple, with good sealing performance, but low pull-out resistance. This structure is often used for resin hoses, steel wire braided hoses and other types of hoses.

With the popularization of hot bending technology, 35 and 45 steels can also be used for elbow joint cores.

With the rapid development of China’s construction machinery, the reliability of hydraulic hose assemblies has become one of the most concerned issues in the industry.

If the structure of the joint core crimping part is unreasonable in the design of different types of hoses, product quality problems will occur to a large extent.

Therefore, the types of (designed) joint cores selected for hoses in different working environments are also different, and a reasonable design can avoid or reduce the occurrence of failures.

With the rapid development of China’s construction machinery, the reliability of hydraulic hose assemblies has become one of the most concerned issues in the industry.

If the structure of the joint core crimping part is unreasonable in the design of different types of hoses, product quality problems will occur to a large extent.

Therefore, the types of (designed) joint cores selected for hoses in different working environments are also different, and a reasonable design can avoid or reduce the occurrence of failures.

(3) Internal locking structure joint core, also known as anti-pull-out structure.

This type of structure is specially designed to prevent the hose from being pulled out of the hose joint, and the tightness is ensured by the rectangular structure.

Therefore, the inner locking structure joint core is actually a combination of the anti-pull-out structure and the rectangular structure.

This kind of joint has the characteristics of high reliability and long service life. It is mainly used for ultra-high pressure and large diameter steel wire winding hose and dynamic steel wire winding hose assembly under harsh working conditions.

2) Outer cap material, type and characteristics

The material of the outer jacket is generally 20 steel, and the good plastic deformation of the material is used to make the outer jacket tooth extruded rubber tube and the joint core sealing fit.

There are also many types of outer caps, mainly for different joint cores, different working environments, different specific working conditions, and different structural forms required.

Usually the inner side of the jacket is made up of some grooves or serrations. There are square grooves, trapezoids, zigzags, etc., which need to be used in conjunction with different types of joint cores.

The commonly used structure types of outer caps are roughly divided into the following three types:

(1) Wave-shaped tooth groove jacket. The outer surface of the wavy jacket is mainly a smooth cylinder, and the angle between the hypotenuse of the inner tooth and the axis is 25°~45°.

The radial side and the hypotenuse are connected by rounded corners of 0.2~0.5mm, generally composed of 3~5 internal teeth. Mainly suitable for non-peeling medium and low pressure hose assemblies, such as resin tubes and steel wire braided hoses; It can be used in conjunction with sawtooth structure and rectangular structure joint core, with weak pull-out resistance and simple processing technology.

(2) Trapezoidal tooth groove jacket. The outer surface is a smooth cylinder, and the inner surface is a groove with a certain number of trapezoidal teeth.

The angle between the hypotenuse and the axis is 25°~45°, and each serration is a rectangular groove. The top of the serration is a plane with a width of 1 to 2mm, and the sharp corners are transitioned with a rounded corner of 0.2mm.

It can be used in conjunction with a rectangular structure joint core to form an effective pull-out resistance, suitable for stripping medium and high pressure braided pipes and winding pipes.

(3) Compound alveolar cover. The outer surface is a T-shaped groove corresponding to the internal tooth dislocation, and the inner surface is a groove with a certain number of bilateral trapezoidal teeth.

It is suitable for use with the inner locking structure joint core and is used for ultra-high pressure and big flow rate hose assembly.

With the gradual development of large-scale construction machinery, the hydraulic system is also constantly developing in the direction of high pressure, and the application of this structural form is becoming more and more extensive.

2. Selection of the amount of joint crimping

According to different hose types and joint types, the appropriate crimping amount is also a key factor to ensure that the hose assembly is trouble-free.

The amount of crimping directly affects the sealing performance, pull-off strength and service life.

Generally, when judging the quality of the crimping deformation, see whether the gap between the inner tooth surface of the outer sleeve and the tooth groove of the joint core is filled by the rubber tube.

Only when the deformation is satisfied can the pull-out resistance and sealing performance be guaranteed.

Generally speaking, the crimping amount of inner rubber hose such as nitrile rubber should make the inner rubber layer compression (40%~45% for steel wire braided hose, 50%~55% for four-layer and six-layer steel wire wound hose); The crimping amount of the resin tube and the PTFE hose ensures that the compression amount of the inner rubber layer is 25% to 30%.

In the case of ensuring the seal, the smaller the amount of withholding, the better. Through calculation and verification, a certain amount of withholding is selected.

3. Conclusion

The article discusses the types of joint cores and outer caps used in the withholding hose assembly.

When the hose crimping has quality problems and the types of failures.

Analyzed the reasons and how to use reasonable crimping configuration and crimping joints, in order to avoid the problem of low hose assembly performance caused by unreasonable hose crimping structure.

Effectively improve and control the reliability of the hose assembly, and also provide strong support for the rapid development of various hydraulic engineering machinery.

Ikin Fluid

—— Top 3 manufacturer in China, specialize in hydraulic test point

Benefits You Can Find In Ikin

factory Price and low moq

reliable quality, supplier for Eaton, Hawee and so on

100% leakage Inspection Before finished

3 years warranty

10 working days for bulk shipping

match other fittings like minimess, stauff and so on

cone seal design structure, stable and long life

Get Your Free Sample

in 2 days

*We respect your confidentiality and all information are protected.

How to maintain and Manage Extrusion Press Hydraulic System

April 15, 2021April 15, 2021 by 爱金流体

pressure hose fittings manufacturer, China

How to maintain and Manage Extrusion Press Hydraulic System

Large aluminum extrusion presses can be used to produce high-specification aluminum extrusion products such as industrial profiles, rail transit profiles and large radiators.

It can be used in aerospace, rail transit, automobiles, ships, construction, machinery manufacturing, electronic power and other fields. In the working process of large aluminum extrusion press, to ensure the working accuracy and high performance, the premise is to have a certain degree of stability. Once the stability of the extruder fails to meet the production standards, the quality of the products produced will be greatly compromised. And enterprises will also suffer huge economic losses.

一. Common problems of hydraulic system of large aluminum extrusion press and their solutions

(一) Pipe leakage:

The welding position of the pipe and the flange is most likely to cause pipe leakage. In addition, the pipe flange installation surface and screw position are also extremely likely to cause pipe leakage.

The occurrence of pipe leakage is mainly caused by the loosening of the screw and pipe joints caused by long-term operation. At the same time, after the flange mounting surface seal is aging, the sealing ring will be damaged.

Improper welding caused pores and cracks, and leakage occurred. In addition, the use time was too long, the safety awareness was not strong, and timely maintenance was not carried out, which caused the situation to expand and eventually cause leakage. We can eliminate pipe vibration and improve stability by adding pipe clamps and brackets.

If the welding operation is not standardized, there are pores or cracks, we can polish in the original position, and after the debris is removed, we can weld again.

(二) Oil leakage in the cylinder:

1. The occurrence rate of oil cylinder leakage is relatively high. Due to the long-term working condition, it will inevitably cause a large amount of abrasive particles. At the same time, because the exposed position of the piston rod is exposed to the air for a long time, it is inevitable that there will be a large amount of dust and aluminum powder attached.

In such situations, a dust ring is usually used to scrape out. However, in view of the effect of the dust ring, it is difficult to completely scrape off, so that the piston rod seal is damaged, which in turn causes leakage. Therefore, two treatment methods are usually adopted for oil cylinder leakage: First, clean the oil cylinder and replace the seals; Second, confirm whether the surface layer of the piston rod is worn or not,

2. The axis of the cylinder is not parallel to the guide rail, and the error exceeds the standard range: 0.04-0.08mm/m. In turn, the end cover fixing bolts were loosened and the seal failed. Then we need to maintain parallelism and control the error within the standard range.

3. The seal is broken and the oil leakage occurs due to the back pressure and the pressure setting is too high. In turn, the seal is exposed to excessive pressure and the seal is broken. This requires resetting the hydraulic system pressure and testing the hydraulic control valve components.

4. The seals are severely worn and fail because the hydraulic oil is severely polluted and produces a lot of impurities. When the oil temperature is at a high temperature for a long time, the hydraulic oil is gradually oxidized, resulting in the production of colloidal deposits. When the oil temperature is in a low temperature state for a long time, the elasticity of the seal will be lost. The aging of the seal is caused by the accumulation of a large amount of oil residue.

Then we need to strengthen the management of hydraulic oil and strictly control the intrusion of pollution sources; Confirm the working condition of the cooling system of hydraulic equipment and ensure its normal operation. The most suitable temperature is 30-45℃.

5. When the appropriate seal is not selected for sealing treatment, when selecting the seal. In order to take into account the material, model and roughness of the seal, oil leakage occurs. Therefore, when selecting seals, carefully identify the characteristics of the seals and select the corresponding reasonable seals.

(三) Leakage of control valve components:

Internal leakage is the most common in leakage of control valve components. The root cause of internal leakage is the large accumulation of hydraulic impurities, which in turn blocks the control valve components; In addition, excessive wear of the valve core and improper closing can cause leakage.

Excessive pressure will cause hydraulic clamping of the spool, which will also cause leakage. It is recommended to clean the control valve repeatedly after disassembling, or to polish the control valve components. In order to improve its accuracy and restore it to its original appearance.

(四) Solenoid valve failure: Solenoid valve failure can be divided into the following types:

1. The spool does not move: (1) Electromagnet failure, combined with vibration and magnetic field detection, it can be seen that the spool does not move; (2) The valve core is clamped, the oil changes, and the return spring is faulty. After vibration detection, the valve core stuck failure can be seen;

2. Large pressure loss: (1) The flow is too large and the size is wrong, which can be seen by joint inspection of vibration and magnetic field; (2) The spool does not move in place, and the spool jamming fault can be seen through vibration detection;

3. Magnetic flux leakage: Defects appear on the surface of the electromagnetic coil, which can be seen by magnetic field detection.

4. Shock (vibration): The spool closing speed is too fast, and the screws are loose, which can be seen by vibration detection.

In view of the causes of the above problems, take corresponding measures to solve the problem.

二. Maintenance and management of hydraulic system of large aluminum extrusion press

(一) Draw up daily maintenance plan

(1) For some equipment exposed to the air for a long time, clean it regularly to keep the exposed parts of the equipment clean and free of impurities;

(2) Keep the operating environment clean and tidy to avoid the intrusion of dust and debris and pollute the hydraulic system;

(3) Carry out patrol inspections at any time where the oil leakage rate is relatively high, and once found, take corresponding measures to solve them immediately;

(4) Standardize the inspection process. Delineate the inspection route and the highest part of the oil spill point. After a certain stage of the inspection work is completed, it shall be handed over with the staff of the next stage, and the work progress of the previous stage shall be explained in detail;

(5) Record the original operating status in detail. Understanding the normal working conditions of the hydraulic system can help to discover and solve problems in time during the inspection process, improve work efficiency, and avoid safety risks.

(二) Develop a regular maintenance and inspection system and schedule a date to calibrate various instruments of the hydraulic system. Ensure that the meter is working properly and has a high degree of accuracy.

At the same time, the hydraulic system should be pressure tested to set a reasonable pressure value to maintain normal temperature. In order to avoid pressure imbalance, the temperature is too low or too high, resulting in leakage. Regularly clean and replace the filter element to determine the composition of debris and hydraulic oil pollution.

Confirm the degree of wear and wear of the hydraulic system, and sample and test the hydraulic oil of the extruder every three months. Check hydraulic oil viscosity, acid value, moisture, particles and other items so that reasonable measures can be taken to solve them.

三. Conclusion

Through analysis, it can be confirmed that the hydraulic system leakage of the aluminum extrusion press is mainly caused by the lack of stability of the hydraulic system. So we have to take corresponding measures.

However, solutions are always attributable to remedial measures, and cannot have a preventive effect.

Therefore, it is of great significance to take necessary hydraulic system maintenance and management in daily work.

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What is the Application of Hydraulic Rotary point

April 6, 2021April 6, 2021 by 爱金流体

hydraulic check damping valve manufaccturer in China

What is the Application of Hydraulic Rotary point

Hydraulic power system is widely used in the industrial field by virtue of its many advantages. When the rotating equipment needs to use hydraulic medium as the transmission power, there are strict requirements on the pressure and control accuracy of the hydraulic medium, usually a pressure above 30MP, and reliable operation.

For the development and application of rotary points, it is necessary to simplify the structure of the equipment while achieving a better conversion function. The most extensive and typical application of hydraulic rotary points is in the hot-rolled wide strip steel coilers of steel rolling equipment. And on the expansion and contraction cylinders of uncoilers, coilers and other equipment on the cold-rolled strip production line.

1. Structural principle analysis of hydraulic rotary point

1.1 Structure and Principle

The hydraulic rotary point has two control oil ports and a drain port, which are respectively connected to the fixed pipelines of the hydraulic system. Each external pipeline is statically connected to the shell of the rotary point.

The shell of the hydraulic rotary point is fixed on the shell of the matching main equipment, and keeps relatively static with the main equipment base, connected with the main equipment through the mandrel. The clearance between the outer diameter of the mandrel and the inner diameter of the hydraulic rotary joint. The gap between the cylinder barrel and the piston is required to be the same as that of the hydraulic cylinder, generally 0.04mm~0.07mm. When conditions permit, lower the limit as much as possible. Each time the hydraulic system is started, a static pressure oil film will be formed in the matching gap, which protects the mandrel and the hydraulic rotary joint from wear and tear, and plays a role of sealing.

The rotating seal is installed on the mandrel of the equipment, and its main function is to isolate the oil inlet cavity and the oil return cavity to form two independent sealed spaces. Most of the materials are wear-resistant composite materials or metal materials. Rotary seals need to withstand high pressures above 30MP, and are required to be resistant to high pressure shocks, not easy to deform, and have small leakage. The rotary seal and the inner wall of the rotary joint are not in contact, and there is fluid friction between the two.

The vibration and impact generated by the high-speed operation of the main equipment are transmitted to the hydraulic rotary joint through the mandrel, resulting in a certain swing of the rotary joint. Two bearings are used to support the axial force and radial force generated by the swing of the rotary joint housing, and to realize the precise positioning of the equipment core shaft and the rotary joint.

The end face seal adopts a skeleton lip seal, which is used to seal the leaking oil from the rotating seal. The leaking oil pressure generally does not exceed 0.3MP. Once the leakage increases, it is easy to damage the end seal and cause the hydraulic oil to leak outside. The oil port of the rotary joint shell is butted with the oil port on the mandrel of the equipment.

1.2 Analysis of internal sealing structure

There are two main types of rotary seals for rotary points, composite seals and mechanical seals. The sealing performance of the composite material seal is relatively better, and it is used where the hydraulic cylinder has an intermediate positioning. The rotary point sealed with composite materials can make the rotary point more compact and exquisite due to the small size of the seal itself. The cost of the composite seal itself is much cheaper than that of the mechanical seal.

The composite rotary seal is composed of two parts, a combination of an outer ring made of PTFE and an O-ring made of NBR. The O-ring plays the role of supporting the outer ring, making the entire rotary seal easier to install, sliding between the outer ring and the housing of the rotary joint. The manufacture of mechanical seals is more complicated, the precision requirements are also relatively high, and the relative price is relatively high.

2. Installation and maintenance of hydraulic rotary points

When installing the hydraulic rotary point on the mandrel of the main equipment, ensure that the cavity of the rotary joint and the mandrel of the main equipment have good coaxiality. It is generally required that the coaxiality between the axis of the rotary joint and the axis of the equipment should be controlled within ±1mm/m. Out-of-concentricity will cause the hydraulic rotary point to produce relatively large radial swings during high-speed rotation. The radial force causes the rotary joint and the mandrel to slide periodically in the axial direction. Not only the dynamic oil film is destroyed and the wear of the mating surface is increased, but also the end face of the seal is worn. At the same time, the bearing can withstand greater external impact. Therefore, poor coaxiality will cause great damage to the internal rotating seal and bearings, and affect the service life.

The housing of the rotary joint is fixed to prevent it from rotating synchronously with the spindle, so as long as it can be prevented from rotating in a circle.

Do not use more constraints. Radial or axial force acting on the shell will be transmitted to the bearing of the hydraulic rotary joint and the internal rotating seal through the shell, forcing the bearing or seal to wear or damage.

When connecting external oil pipes, strictly abide by the hydraulic equipment installation specifications. In particular, it is necessary to strictly check the cleanliness of each oil port to prevent external contaminants and machined burrs from being brought into the rotary joint. Due to the complex internal structure of the hydraulic rotary joint and the small matching clearance, once external contaminants enter the hydraulic rotary joint, it is easy to cause damage to the oil film, mechanical seals and bearing jams, and serious leakage.

The skeleton oil seal of the rotary joint is used to seal the rotating mandrel, so that the leaking oil of the rotary seal is drained from the leaking oil pipe to the oil tank. The pressure resistance of the oil seal is usually no more than 3bar, so the leaking oil pipe must be returned to the oil smoothly.

During installation, the leaking oil port of the rotary joint must not be blocked. If there is a valve on the leaking oil pipe, it must be opened before the medium is introduced, otherwise the oil seal will inevitably be squeezed out. It is also not possible to incorporate the leaking oil pipe into the oil return pipe, because the pressure of the oil return pipe usually exceeds 3 bar. Do not install a filter on the leaking oil pipe. Rotary joints usually have leakage, so they can’t be used in occasions where pressure is required. The leakage of mechanical seals is greater.

Servo control can be considered when it is required to control the stroke of the hydraulic cylinder to compensate for the leakage. When the hydraulic cylinder is not positioned in the middle, the problem will be simpler, as long as the hydraulic cylinder continues to supply the medium after the hydraulic cylinder moves to the limit position.

Rotary joints are generally lubricated and cooled by medium, so it is not possible to test or drive without passing the medium. Make sure to open the leaking oil pipe after overhauling the rotary joint or related equipment. The wear or damage of hydraulic rotary joints can be estimated by measuring the leakage. The leakage of rotary joints should be monitored and tracked regularly to monitor the operating conditions of rotary joints.

3. Common faults of hydraulic rotary joints

In actual use, hydraulic rotary joints mainly have two types of faults. One fault is manifested as the internal bearing damage of the rotary joint, and the other is the external leakage of the rotary joint.

Analyze the causes of internal bearing damage, there are three main points:

1) The hydraulic oil has poor cleanliness and granularity during installation or during use, resulting in serious wear and failure of the rolling elements of the bearing;

2) When the rotary joint is installed, the installation accuracy requirements are not met, resulting in uneven force under the static load state of the bearing and excessive vibration value under the dynamic load state, causing damage to the bearing;

3) The selected hydraulic rotary joint design and manufacturing quality do not meet the requirements of the working conditions of the equipment. The reasons for leakage outside the rotary joint are:

The machining accuracy of the mating surface of the installation seal is low, which cannot meet the accuracy requirements of the seal;

The selection and installation of the seal are not suitable for the requirements of the working conditions;

The installation accuracy of the rotary joint is poor, causing excessive vibration and damage to the seal.

4. Conclusion

In practical applications, due to the complex working conditions of the main equipment and the changeable environment. When selecting a specific application, a rotary joint suitable for a wide range of loads should be selected according to the specific working conditions. In order to meet the requirements of the main equipment from low pressure and low speed to high pressure and high speed in a wide range of working conditions. The high-precision mechanical seal hydraulic rotary joint can better realize the purpose of small leakage, reliable and durable operation.

By improving the processing accuracy and technical requirements of the parts, and improving the installation accuracy, the ability of the rotary joint to adapt to high speed and high pressure can be greatly improved, and the service life can be prolonged.

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How to Correctly use hydraulic self-sealing connectors and troubleshoot？

July 3, 2021April 2, 2021 by 爱金流体

Hydraulic Pressure Gauge Connector with 90° Elbow manufacturer in China

How to Correctly use hydraulic self-sealing connectors and troubleshoot？

With the development of construction machinery, there are more and more types of hydraulic machinery, so it is inevitable that many mechanical failures will be encountered.

Because of the different positions, the required accessories are also different, including hydraulic self-sealing joints.

In the process of using hydraulic self-sealing joints, failures will inevitably occur.

1. Common troubleshooting

(1) One side is conducting and the other side is cut off during operation，The reason is mostly caused by the difference in spring force of the two ball valve springs.

When the oil circuit is connected, the steel ball on the side with the smaller elasticity returns a long distance. The steel ball on the side with greater elasticity is not returned, and the ball valve on this side is still closed.

In addition, this failure can also occur when a side of the steel ball is stuck by debris.

The elimination method is to remove the self-sealing connector. Twist the adjusting bolts to make the springs on both sides consistent;When the steel ball is stuck by sundries, the ball valve should be disassembled to remove sundries, and then reinstalled after washing.

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(2) All pipelines on both sides are cut off during operation. The reason is that the elastic force of the springs on both sides is too weak, which makes the steel ball automatically cut off under the action of hydraulic force.

If the oil flow is blocked, or the internal wear of the self-sealing joint is worn, the two steel balls cannot push each other apart during normal installation.

The troubleshooting method is to turn the adjusting screw to increase the spring pre-tightening force or replace the spring;

When installing the self-sealing joint, add a gasket between the two steel balls to push the two steel balls apart.

2. use correctly

(1) The gasket between the self-sealing joint and the hydraulic oil pipe joint should be kept intact. If the gasket is lost, reinstall it in time. To prevent oil leakage and air intake.

(2) When connecting the pipeline, firstly wipe the butt end of the joint body assembly and the joint sleeve assembly clean.

Then push the connecting sleeve inward. Then insert the joint body assembly into the joint sleeve assembly, and finally loosen the coupling sleeve.

The locking steel ball is dropped into the groove of the joint body and locked to ensure that the two ball valves compress the spring at the same time and push each other open to connect the oil circuit.(Note: The sealing ring between the joint body and the joint sleeve should be kept intact.)

(3) When disassembling the pipeline, push the connecting sleeve inward.

Push inward from the joint sleeve and pull out the joint body assembly from the joint sleeve assembly.

The two ball valves simultaneously quickly close the leakage of the joint sleeve assembly and the mixing of air under the action of the spring.

(4) When the self-sealing joint is disconnected, it is strictly forbidden to load the pipeline through the control handle to prevent damage to the joint or bursting of the oil pipe.

(5) In order to prevent the self-sealing joint from being contaminated by dust and muddy water, it is best to wrap the joint with a plastic bag; When the connector is disconnected, cover the connector body and connector tightly with a cloth or plastic bag.

conclusion

When the hydraulic self-sealing joint fails, do not blindly repair it.

Using it in the correct way can greatly reduce the cost of machinery and reduce unnecessary troubles.

IKIN FLUID, your hydraulic test fittings supplier :