Fatigue test apparatus of vehicle manual brake controlling mechanism

[0015] like figure 1 , figure 2 , image 3 , Figure 4 As shown in the figure, the fatigue test device of the automobile hand brake operating mechanism includes a frame 10, two fatigue test mechanical units, a solenoid valve 7, and an electric control box 12. The support plate, the specimen mounting bracket 4 on the upper surface of the support plate, the cylinder I8, the cylinder II9, the first fixed pulley 1, the second fixed pulley 6, the movable pulley 5, the wire rope 2 and the counterweight 11, the axis of the cylinder I8 and the cylinder II9 Cross, the first fixed pulley 1 is located at the top of one side of the frame 10, the second fixed pulley 6 is located on the other side of the frame 10, one end of the wire rope 2 is fixed on the frame 10, and the other end of the wire rope 9 is connected with a counterweight Block 11, the wire rope 2 passes through the movable pulley 5, the second fixed pulley 6 and the first fixed pulley 1 in turn, the force F of the movable pulley pulling the specimen 3 is equal to twice the weight W of the counterweight block, so the weight of the counterweight block can be reduced. It is small, and realizes the lightweight of the test load counterweight, which is not only easy to operate during the test, does not require lifting equipment, but also reduces the volume of the rack and improves the utilization rate of the rack.

[0016] The test piece mounting bracket 4 is detachably connected to the frame 10, and can be adapted to various sizes and structures. The automobile hand brake operating mechanism of different specifications only needs to replace the test piece mounting bracket to perform the fatigue test. The electronic control part is connected with the electronic digital counter, which is convenient for users to record accurate numbers.

[0017] During the test, first install the test piece 3 of the automobile handbrake control mechanism on the test piece mounting bracket 4 with bolts. The starting position of specimen 3 is horizontal. The initial state of the cylinder I8 and the cylinder II9 is ​​the piston retracted state. Then, the piston rod of the cylinder I8 is fastened on the handle of the specimen 3 through the plane hinge mechanism, and the cylinder II9 is ​​fixed on the handle of the specimen through the fixing frame. Then connect the test piece to the movable pulley bracket, thread the wire rope 2, use a rope clip to make a loop on each end of the wire rope 2, one end of the wire rope 2 is fixed on the frame, and the other end is hung with the counterweight 11. Connect the power and air supply, press the start button, according to Figure 4 The electrical control schematic diagram shows that the magnetic switches "al, al', a2 are off, the magnetic switches a3, a4 are on, the relays K1 are on, K5 is on, K2, K3, K4, and K6 are off, and the solenoid valve coil of the cylinder I8 is controlled. Power on, the piston of the cylinder I8 extends until the magnetic switch a1' is turned on, causing K5 to be turned off, K6 to be turned on, the cylinder I8 piston continues to rise until the magnetic switch a1 is turned on, a1', a2, a3 are turned off, and a4 is turned on, Relays K1, K2, K5 are connected, K3, K4, K6 are disconnected, the solenoid valve coil of control cylinder I8 is de-energized, the piston of cylinder I8 stops rising, at the same time, the solenoid valve coil of another control cylinder II9 is ​​energized, and the piston of cylinder II9 extends , Press and hold the release button of the hand brake control mechanism until the magnetic switch a2 is turned on, at this time, a1', a3, a4 are turned off, the relays KI and K3 are turned on, and K2, K4, K5, and K6 are turned off. The solenoid valve coil of the control cylinder I8 is turned on. When the piston of the cylinder I8 retracts and meets the magnetic switch a1', a1' is turned on, the relay K6 is turned on, and the piston continues to retract. When it reaches the magnetic switch a3, a3 is turned on, and a2 is turned on. Connected, relays K1, K4 are connected, K2, K3, K5, K6 are disconnected, the piston of the cylinder II9 retracts, release the release button of the hand brake control mechanism 32, and enter the next cycle; repeat the cycle.