What is the specific function of Pneumatic Quick Couplings?

Pneumatic Quick Couplings are mainly used for air piping and pneumatic tools. They can be used to connect or disconnect pipes without tools. When not connected-when the ferrule of the mother body is moved to the other end, stainless steel The bead automatically rolls outward, and the child body is disconnected by the action of the spring force of the valve of the mother and the child, and the valves of the child and the mother will be closed separately, blocking the fluid flow in an instant.

 Pneumatic quick couplings
Quick couplings are generally suitable for the connection of pneumatic pipelines, compressed air, and nitrogen. The pipelines can generally be placed in working positions that are often loaded and unloaded, such as the operation of pneumatic tools in the assembly line, and of course can also be used for hydraulic machines, chemical and marine piping Wait.

What is the specific function of Pneumatic Quick Couplings?
How to distinguish the quality of high pressure rubber hose

How to distinguish the quality of high pressure rubber hose

How to distinguish the quality of thehigh pressure rubber hose? Mainly distinguished from the following points:

1. First look at the outer rubber of the high-pressure tubing to see if the surface is smooth and flat, whether there are bubbles, bumps, sponges, trachoma, etc.; when seizing, use a peeling machine to remove the rubber to see if the peeled rubber is continuous and continuous The ones are of good quality.

2. Look at the brightness of the cross section of the high pressure rubber hose from the outside, the high-brightness is the top grade, and the gel layer is better with nails to pinch the gel to have good elasticity.

3. From the cross section of the high pressure rubber hose to see whether the steel wire layer inside is uniform, it is distinguished from the diameter of the steel wire. The steel wire mesh of the hose is evenly distributed and there is no missing knitting. The thicker the diameter of the inner steel wire, the better.

4. Look at the uniformity of the tube wall thickness of the inner rubber layer and the size of the inner hole of the rubber tube, and try to distinguish it with a standard joint.

5. Through the pressure test, the national standard requires the test pressure to be 2 times the working pressure, and the burst pressure is generally 3-4 times the working pressure to qualify.

6. Poor quality high pressure rubber hose will appear: high pressure rubber hose wall thickness is uneven; steel wire braiding is too tight, too loose or the number of steel wire layers is too small; the amount of deformation of the high pressure rubber hose is large after pressurization; poor air tightness of the outer rubber layer causes the steel wire to rust; the inner layer The poor sealability of the glue makes the high-pressure oil easily enter the steel wire layer; the glue layer and the steel wire layer have insufficient adhesion. The above conditions will reduce the bearing capacity of the high pressure rubber hose, and eventually burst at the weak point of the tube wall.

About the selection skills of high pressure rubber hose

high pressure rubber hose is one of the main connecting parts in modern industrial equipment and engineering machinery, and it is more widely used in hydraulic systems. The high pressure rubber hose structure is composed of a medium-resistant inner rubber layer, a middle rubber layer, a steel wire reinforcement layer, and a weather-resistant and wear-resistant outer rubber layer.

The accurate selection of high pressure rubber hose is related to the normal tasks of the entire hydraulic system and the purchase cost of the enterprise. Therefore, when selecting hydraulic hoses, you should refer to the equipment maintenance manual, focusing on the following aspects:

First, select the appropriate high pressure rubber hose according to the equipment working condition (temperature) and the condition of the hydraulic medium. The high or low temperature of the high-pressure hose working condition will affect the life and pressure performance of the hose, so the hose should be used within the limit that it should reach. For systems where the task temperature is not within the limit for a long time, hose protection should be used. Set or purchase extraordinary hoses. If it is an extraordinary medium, make sure that the inner and outer layers, joints, and sealing rings of the high pressure rubber hose are compatible with the medium.

Second, determine the maximum task pressure of the high pressure rubber hose according to the pressure of the system. Each high pressure rubber hose has a maximum task pressure. The burst pressure of the high pressure rubber hose is 3-4 times the maximum task pressure. The higher the pressure resistance of the high-pressure hose, the higher the price. Therefore, according to the actual pressure of the system, choose the high pressure rubber hose The maximum task pressure can ensure the normal operation of the system and save procurement costs. If the system has a high frequency of impact pressure, a high pressure rubber hose with a higher pulse life should be selected, and the maximum task pressure of the high-pressure hose should be selected appropriately.

Third, select the inner diameter of the high-pressure hose according to the flow rate. If the diameter of the pipe is too small, the flow rate of the medium in the pipe will be increased, the system will generate heat and the efficiency will be reduced, and excessive pressure drop will occur, which will affect the function of the entire system. Excessive pipe diameter will increase procurement costs and affect the normal operation of the system, so the inner diameter of the hose should be appropriate. When the high-pressure hose needs to be fixed with a pipe clamp or the hose passes through the steel plate, pay attention to the outer diameter of the hose.

Fourth, when choosing a high-pressure hose, you should pay attention to the bending radius of the high-pressure hose. When calculating the bending radius, the crimping length of the front joint should be subtracted. If the bending radius of the installed hose is too small, it will reduce the pressure-bearing performance of the hose and reduce its service life.

Fifth, the purchase of supporting assemblies for high pressure rubber hose. According to the installation space structure of the hydraulic hose, the joint type, the angle of the joint and the assembly angle of the hose assembly should be selected reasonably.

About the selection skills of high pressure rubber hose
Common problems when using high pressure rubber hose

Common problems when using high pressure rubber hose

Generally speaking, all hydraulic pipelines of fully mechanized coal mining and high-end general mining support equipment are basically composed of high pressure rubber hose assembly and related pipeline accessories. The high pressure rubber hose has many specifications and models, and the amount of use is large. The failure performance of the high pressure rubber hose There are many forms and the reasons are complicated. In the working face and roadway, hundreds of meters long, exposed high-pressure pipelines, any failure may increase safety hazards; failure will directly cause the working face to stop, affect production efficiency, increase maintenance costs; in addition, replace in harsh environments high pressure rubber hose will inevitably pollute the system, increase the hidden troubles of other links in the system, and reduce the reliability and efficiency of the entire hydraulic system. This is a concern for any hydraulic system.

1. The problem form and impact of high pressure rubber hose assembly

2. Reason analysis of high pressure rubber hose

The reasons for the failure of the mine high pressure rubber hose assembly and intermediate joint components are summarized as follows:

(1) The pressure source of the hydraulic (emulsion) system adopts a three-piston pump or a five-piston pump, with high rated pressure, large flow, and large pressure pulsation. Each component of the pipeline is easy to fatigue and damage.

(2) The emulsion medium has low privacy, high density, and relatively poor corrosion resistance. Especially, the pH of the water in different mining areas is very different, and the management is not strict during use. The underground emulsion often fails to reach the specified oil-water ratio, and the rubber has been in In the immersion of this medium, it will inevitably deteriorate, harden and age.

(3) The damage of the inner rubber layer of the high-pressure hose accelerates the corrosion of the steel wire mesh of the hose and reduces the compressive strength of the high pressure rubber hose. The pressure wave has a strong impact on the high pressure rubber hose assembly and joint components, and leads to the fracture of dangerous sections of the high pressure rubber hose assembly and joint components.

(4) The coal mine production environment is dusty, humid, and the water is weakly alkaline. The vibrating pipeline rubs against environmental objects, so that the rubber on the surface of the high-pressure hose is worn, and the anti-corrosion layer on the surface of the joint component falls off, which promotes the damage process.

(5) The factories that produce high pressure rubber hose assemblies and intermediate joint components are mostly small and medium-sized enterprises. They are restricted by technology, equipment, capital and other conditions, and some do not even process according to the process requirements of the drawings. The high-pressure hose assembly and piping accessories cannot meet the requirements. To the technical requirements, the product quality is uneven, the strength is low, the life is short, and the pollution is serious, laying hidden dangers for sudden safety accidents.

(6) The design layout is unreasonable. Under normal circumstances, the high-pressure hose is mainly subjected to internal pressure and a certain external force. The incorrect arrangement will cause the high-pressure hose to be subjected to additional additional force for a long time and reduce the service life of the high pressure rubber hose assembly.

(7) The failed pipeline components are used for over-life. Since it is impossible to inspect and accurately determine whether high-pressure hoses and pipeline components have failed or reached their service life, there are a large number of components used over-life on site. These high pressure rubber hose are often prone to failure during use, leading to an increase in failure rate.



Solutions to common problems of high pressure rubber hose

Solutions to common problems of high pressure rubber hose

Analysis and prevention shows that there are many reasons for the problems of high pressure rubber hose, and these causes and consequences are mutually supportive, and are malicious inducements in the laboratory and in actual use. high pressure rubber hose can be summarized as two factors: quality problems and system factors. System factors are determined by the composition of the system, which affect the improvement in the short term. Quality problems are characterized by clear human factors and are controlled and improved. Therefore, it can be considered that the key to removing high-pressure hose failures is the key to improving high pressure rubber hose Quality control in all aspects of manufacturing, design and use.

(1) Choose a suitable high-pressure hose host and strengthen high-pressure hose testing. The quality of high-pressure hose testing includes production, processing, inspection, testing, packaging and other aspects. The packaging of high-pressure hoses must be strictly controlled. . Standard requirements to ensure the normal use of high pressure rubber hose.

(2) Strengthen the management of the high pressure hose during the staying process, first in, first out, and pay attention to the middle high pressure hose to avoid dragging, corrosion, heat, etc. to damage the outer rubber layer, avoid heavy objects squeezing the foam, avoid excessive contamination, and affect the world The myocardium of the high pressure rubber hose.

(3) In the third-party installation and use of the high-pressure hose, follow the correct installation and assembly site to ensure the normal service life of the hose and control the quality to avoid accidental corrosion and damage to the high pressure rubber hose.

(4) Regularly inspect the quality of the high pressure rubber hose system in use, eliminate the fault in time, and avoid the loss of faults and unplanned working hours.

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