Method for manufacturing a pull-off force testing device for coated piston

【 Technical field 】

The utility model relates to a pull-off force testing device, in particular to a pull-off force testing device for a rubber coated piston.

【 Background Technology 】

[0002] In the suspension system, due to the vibration caused by the impact of the elastic element, in order to improve the ride comfort and comfort of the vehicle, the suspension and the elastic element are installed in parallel with the shock absorber.The pistons in the shock absorber move up and down as the frame and axle vibrate relative to each other.Due to the frequent relative movement of the piston and the shock absorber cylinder block, it is necessary to cover the surface of the piston with wear-resistant and low friction resistance materials, such as PTFE, to extend the service life.

[0003] After the piston is wrapped, it is necessary to test the piston to determine whether the product meets the design requirements (bearing capacity, friction resistance, sealing effect) and whether it is qualified (the greater the pulling force obtained by the test, the harder the coating is to fall off, that is, the better the performance of the piston).At present, the equipment which can test the pull-off force of the coated piston more accurately, and which is convenient to manufacture and low cost is urgently needed.

[0004] as a result, the applicant to apply for a package of rubber piston to take off the pull force testing device, including support, and drives the driving mechanism of stents elevation and subsidence movement of the bracket connected with the first hand the upper sensor, and the lower end of the dint sensor is connected to the piston rod, piston rod at least in part, to extend to a pressure tube, the lower end of the piston rod is fixed under test bag rubber piston,The pressure pipe is fixedly arranged in a fixed test cylinder, the test cylinder is arranged outside the side force loading device, the test cylinder is also provided with a heating device.This testing device, however, is a destructive process because the piston rod presses the piston from top to bottom until the coating on the piston falls off.In addition, when the bell mouth of the rubber piston is not fully opened, the pressure tube cannot be completely sealed due to the manufacturing process and other factors, which will cause oil leakage.

[Content of Utility Model]

The technical problem to be solved by the utility model is to provide a test device for the pulling force of the coated piston to prevent oil leakage in view of the problems existing in the prior art.

The technical solution adopted by the utility model to solve the technical problems is: a rubber covering piston pulling force testing device, including a working cylinder, a piston rod, a side force loading device and an oil cylinder, the working cylinder is formed in the cylindrical working cavity,Described one end of the piston rod is set to test a rubber piston and from the work described in the cavity inserted into the opening at the top of the work described in the cavity, the work described in the inner diameter of the cavity piston adaptation and stated, lateral force loading device installed in described above the piston rod in work outside of the cavity part, described the piston bottom sealing, of the outer edge of the work described in the cylinder wall is equipped with heating circle,The oil cylinder comprises an inlet oil pipe, a return oil pipe and an oil pressure gauge, the inlet oil pipe is communicated with the bottom of the working cavity, and the return oil pipe is communicated with the upper part of the working cavity.

The lower part of the outer wall of the working cylinder is provided with an oil inlet, the oil inlet is communicated with the bottom of the working chamber through an oil inlet channel formed in the working cylinder, and the oil inlet pipe is connected to the oil inlet;The upper part of the outer wall of the working cylinder is provided with an oil return port, the oil return port is communicated with the upper part of the working chamber through the oil return channel formed in the working cylinder, and the oil return pipe is connected to the oil return port, so that even if there is leakage of oil, the oil can be returned to the oil cylinder.