High-pressure hose is an important hydraulic system component of the hydraulic system of pipeline construction machinery such as pressure tapping machine, self-climbing hydraulic pipe cutting machine, hydraulic mud pump, etc. Leakage, crack, rupture, loosening and other faults often occur in use. Pressure tapping construction operators often simply replace the hose without analyzing the cause of the fault, and the same fault will be repeated soon after use, which is finally attributed to the quality problem of high-pressure hose. In fact, the loosening or rupture of the high-pressure hose not only wastes hydraulic oil, pollutes the environment, but also affects work efficiency, and even accidents occur, endangering the safety of man-machine. Hose pipes for pipeline engineering machinery are divided into high pressure hose and low pressure hose.

Although vulcanized rubber strips have good comprehensive properties, not all products can be used in a wide range. NBR materials with good oil and solvent resistance are prone to aging and cracking under oxidation, and their cold resistance is relatively poor. It is quite targeted to distinguish the material types of rubber strips used as a reference. 3. In addition to the reference value of material and comprehensive performance, the sealing effect is also a core element that cannot be ignored for the distinction between the types of rubber strips, and to do this, it is necessary to select high quality manufacturers and products to ensure its effect.

The price is relatively low. Due to the different quality, the price is generally between 6000 yuan and 15000 yuan/ton. Low-end products due to the use of waste, alternative plasticizers and high filling amount, to make the rubber strip elasticity is poor, easy to harden, there is a thorn nose smell, easy to migrate to make the frame material yellow, short service life. A small number of doors and windows in the low level of price competition enterprises are still in use. Medium and high-end PVC rubber strips can reach the standard index, and the service life is relatively long. Because PVC products contain halogen, stabilizer contains heavy gold A, it is not conducive to environmental protection, so foreign developed countries and domestic Beijing and coastal cities have eliminated or restricted the use of PV.

This paper briefly introduces how to detect the quality of high-pressure rubber hose: first of all, starting from visual inspection, the wall thickness of rubber hose with poor quality is uneven, the steel wire is too tightly woven or the number of layers is too small, the rubber hose will deform greatly under slight pressure change, be easily corroded by corrosion, and the adhesive force between the rubber layer and the steel wire layer is lack, which will make the pipe wall easily burst. Secondly, improper selection of the buckling amount and buckling speed during the assembly of the hose and the joint, or unreasonable selection of the structure, material and size of the joint, can lead to too tight or too loose pressure between the hose and the joint, resulting in early damage to the joint. In addition, the joint design is unreasonable, poor processing quality, will also constitute the internal glue.

1, vulcanization did not reach positive vulcanization, the form of sulfur or sulfur. Due to the above two reasons, its various attributes and functions cannot meet the requirements, resulting in problems during use. 2. The wall thickness of the hose is uneven, especially the inner rubber layer has the greatest influence. 3. The steel wire weaving or winding process did not follow the design process, the weaving angle did not reach 54 degrees and 44 minutes, the steel wire weaving was too tight or too loose, and the deformation (elongation, shortening or bending deformation) of the high-pressure hose during use (after pressurization) was large. 4. Poor air tightness of the outer layer of glue leads to corrosion of the steel wire. 5, the inner layer of rubber sealing is poor and the high pressure oil easily into the steel wire