The correct selection of the high-pressure hose used in the hydraulic mud pump can ensure the safety of the entire hydraulic system, reasonably arrange the space, and better control the cost. Mainly pay attention to the following points:
According to the pressure of the hydraulic pump station system, choose the number of steel wire layers of the hose, the pressure is high, and the number of steel wires is more. Each type of hose has a maximum working pressure, and the burst pressure of the hose is 4 times the maximum working pressure. The higher the pressure resistance of the hose, the higher the price. Therefore, when selecting the high-pressure hose of the hydraulic mud pump, we should select the maximum working pressure of the hose according to the actual system pressure. The maximum working pressure of the selected hose can be 1.2-1.5 higher than the actual working pressure. Can maintain product economy and product performance. Of course, if the impact pressure is frequent in the hydraulic system used by the hydraulic mud pump, a particularly pulse-resistant hose can be selected.
Choose the inner diameter of the hose according to the flow rate of the hydraulic mud pump and the hydraulic pump station. Too small a pipe diameter will increase the flow rate of the medium in the pipe, cause the system to heat up, reduce efficiency, and cause excessive pressure drop, which affects the performance of the entire system. Excessive pipe diameter will increase the cost, so the inner diameter of the hose should be appropriate. When the hose is fixed with a pipe clamp or the hose passes through spacers such as steel plates, pay attention to the outer diameter of the hose.
When choosing a high-pressure hose, you should also pay attention to the bending radius of the high-pressure hose. When calculating the bending radius, you should subtract the crimping length of the front joint. If the bending radius of the installed hose is too small, it will reduce the pressure-bearing capacity of the hose and affect its life.
According to the hydraulic layout, the joint form should be selected reasonably, such as: SAE flange joint, internal thread joint or external thread joint, 90, 45 and other joint angles and the overall hose assembly angle.
Hydraulic hose is composed of inner and outer rubber layer and inner steel wire braided layer. According to the different pressure of the hydraulic hose, the number of steel wire layers inside is different. Generally, the steel wire layer is from 1 to 6 layers, and the maximum pressure can reach 60MPA. The inner rubber of the hydraulic hose is mineral oil, bio-oil, synthetic rubber with good swelling properties, and the outer layer is abrasion-resistant and anti-aging rubber. In the middle is a high tensile steel wire winding layer. The suitable medium for the hydraulic hose is mineral oil, oil-water mixture, polyethylene glycol base oil, synthetic grease base oil, rapeseed oil, etc. The suitable working temperature of commonly used hoses is -40℃-100℃, and the highest temperature is 125℃.