A skeleton oil seal testing device

Abstract

The invention discloses a skeleton oil seal testing device, comprising a test bench, a mounting frame, a hydraulic motor, a slewing support frame, an oil circuit system and a load simulation mechanism, wherein the mounting frame, the slewing support frame and the load simulation mechanism are respectively fixed on the test bench at intervals, the hydraulic motor is fixed on the mounting frame, and the hydraulic motor is connected with an oil tank through the oil circuit system, a skeleton oil seal to be tested is installed on the output shaft of the hydraulic motor, the skeleton oil seal is located in an output sealing cover of the hydraulic motor, a transmission shaft is rotatably arranged on the slewing support frame, one end of the transmission shaft is coaxially fixed with the output shaft of the hydraulic motor, and the other end of the transmission shaft is coaxially fixed with the input end of the load simulation mechanism; the advantage is that the structure is simple and the performance of the skeleton oil seal can be effectively tested.

Description

Technical Field

[0001] The invention relates to a testing device, in particular to a skeleton oil seal testing device. Background Art

[0002] Skeleton oil seals are widely used in machinery, chemical industry and other industries due to their simple structure, significant effect and convenient maintenance and replacement. Existing skeleton oil seals include a skeleton, one side of which is connected to a waist and a lip, the lip is equipped with a surrounding spring, and the other side of the skeleton is connected to a dust lip. The thickness of the dust lip is roughly equal at all places, and its end is slightly in contact with the shaft to prevent dust from entering, so that the parts that need to be lubricated in the transmission parts are isolated from the output parts to prevent the leakage of lubricating oil. At present, skeleton oil seals are widely used in gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, hydraulic motors and other parts.

[0003] However, in the prior art, after the skeleton oil seal is produced, the quality inspection department often judges whether the skeleton oil seal is qualified by appearance, but the sealing performance of the skeleton oil seal cannot be tested. If it is directly applied to the product based on the manufacturer's guarantee without performance testing, there is a high risk of oil seal leakage, which may cause the entire product to be unable to be used normally. Summary of the invention

[0004] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a skeleton oil seal testing device, which has a simple structure and can effectively test the performance of the skeleton oil seal.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a skeleton oil seal testing device, comprising a test bench, a mounting frame, a hydraulic motor, a rotating support frame, an oil circuit system and a load simulation mechanism, the mounting frame, the rotating support frame and the load simulation mechanism are respectively fixed on the test bench at intervals, the hydraulic motor is fixed on the mounting frame, and the hydraulic motor is connected to the oil tank through the oil circuit system, a skeleton oil seal to be tested is installed on the output shaft of the hydraulic motor, and the skeleton oil seal is located in the output cover of the hydraulic motor, a transmission shaft is rotatably arranged on the rotating support frame, one end of the transmission shaft is coaxially fixed with the output shaft of the hydraulic motor, and the other end of the transmission shaft is coaxially fixed with the input end of the load simulation mechanism.

[0006] The load simulation mechanism includes a magnetic powder brake, which is fixed on the bench, and the input end of the magnetic powder brake is fixed to the transmission shaft through a first coupling. In this structure, the magnetic powder brake is a prior art, which transmits torque based on electromagnetic principles and magnetic powder, and can quickly adjust the torque according to the input current, so as to better simulate the performance of the skeleton oil seal without torque.

[0007] The output end of the hydraulic motor is fixed to the transmission shaft via a second coupling. In this structure, the second coupling serves to connect the output end of the hydraulic motor to the transmission shaft, so that the transmission shaft rotates more smoothly.

[0008] The slewing support frame is equipped with a torque sensor for detecting the torque of the transmission shaft and a speed sensor for detecting the speed of the transmission shaft, and the torque sensor and the speed sensor are electrically connected to the display respectively. In this structure, the torque sensor is used to detect the torque of the transmission shaft, and the speed sensor is used to detect the speed of the transmission shaft. Both are electrically connected to the display via signal lines, so that the values ​​of torque and speed can be displayed in real time.

[0009] The hydraulic motor has an oil inlet port, an oil return port, a first oil drain port and a second oil drain port. The oil circuit system includes a first oil suction filter, a variable pump, a first motor, a first non-return valve, a two-position four-way reversing valve, a first strong magnetic filter, a back pressure valve, a first throttle valve, a second throttle valve, a second strong magnetic filter, a second non-return valve, a heat exchanger and an oil return filter. The oil inlet of the first oil suction filter is connected to the oil tank, the output shaft of the first motor is connected to the variable pump, the oil outlet of the first oil suction filter is connected to the oil inlet of the variable pump, the oil outlet of the variable pump is connected to the P port of the two-position four-way reversing valve, the A port of the two-position four-way reversing valve is connected to the oil inlet of the first strong magnetic filter, and the oil outlet of the first strong magnetic filter is connected to the hydraulic motor. The oil inlet port of the back pressure valve is connected to the oil return port of the hydraulic motor, the oil outlet of the back pressure valve is connected to the oil inlet of the second strong magnetic filter, the oil outlet of the second strong magnetic filter is connected to the B port of the two-position four-way reversing valve, the T port of the two-position four-way reversing valve is connected to the oil inlet of the second one-way valve, the oil outlet of the second one-way valve is connected to the oil inlet of the heat exchanger, the oil outlet of the heat exchanger is connected to the oil tank through the return oil filter, the oil inlet of the first throttle valve is connected to the oil inlet of the back pressure valve, the oil outlet of the first throttle valve is connected to the first oil drain port, the second oil drain port is connected to the oil inlet of the second throttle valve, and the oil outlet of the second throttle valve is connected to the oil tank. In this structure, the hydraulic oil coming out of the oil tank is first filtered by the first oil suction filter and then transmitted to the variable pump. The variable pump is controlled by the first motor and can adjust the oil suction volume. Then the variable pump transports the hydraulic oil to the P port of the two-position four-way reversing valve, and then flows out from the A port of the two-position four-way reversing valve. After filtering and adsorbing by the first strong magnetic filter, it flows to the oil inlet port of the hydraulic motor and then flows out from the oil return port of the hydraulic motor, thereby driving the hydraulic motor to rotate. The hydraulic oil flowing out of the oil return port of the hydraulic motor passes through the back pressure valve and the second strong magnetic filter in turn and flows to the B port of the two-position four-way reversing valve, and then flows out from the T port of the two-position four-way reversing valve. The setting of the back pressure valve can adjust the oil pressure on the return oil pipeline. The hydraulic oil flowing out from the T port of the two-position four-way reversing valve passes through the second one-way valve, the heat exchanger and the return oil filter in turn and flows back to the oil tank to form a complete circulating oil system. The heat exchanger adopts a plate heat exchanger to play a role in rapid heat dissipation. The oil inlet of the first throttle valve is connected to the oil inlet of the back pressure valve, so that part of the hydraulic oil flowing out from the return oil port of the hydraulic motor enters the first oil drain port and then flows out from the second oil drain port. By adjusting the second throttle valve and the first throttle valve, the required shell cavity pressure of the hydraulic motor is achieved, thereby simulating the performance of the skeleton oil seal under no pressure. In addition, the return oil pressure must always be higher than the shell cavity pressure to ensure the shell cavity pressure building. The return oil pressure is adjusted by the back pressure valve on the return oil pipeline.

[0010] The oil tank is also connected to the second oil suction filter, the oil outlet of the second oil suction filter is connected to a hydraulic pump, the hydraulic pump is controlled by a servo motor, the oil outlet of the hydraulic pump is connected to a third one-way valve, and the oil outlet of the third one-way valve is connected to the P port of the two-position four-way reversing valve. In this structure, there are two routes to the P port of the two-position four-way reversing valve, one route is composed of a variable pump, and the other route is composed of a hydraulic pump. In this way, the required motor speed can be achieved by adjusting the flow of the variable pump and the hydraulic pump, which is converted into the linear speed of the skeleton oil seal. The structure is simple and practical.

[0011] The P port of the two-position four-way reversing valve is also connected to the oil tank through an overflow assembly. In this structure, the overflow assembly is composed of two overflow valves, which play a role in safe pressure relief and ensure the smoothness and safety of the entire oil circuit.

[0012] The oil inlet port of the hydraulic motor is also connected in parallel with a first pressure sensor and a first high-pressure manual ball valve, the oil outlet of the first high-pressure manual ball valve is connected to the oil tank, and the oil return port of the hydraulic motor is also connected in parallel with a second pressure sensor and a second high-pressure manual ball valve, the oil outlet of the second high-pressure manual ball valve is connected to the oil tank. In this structure, the first pressure sensor is used to detect the pressure at the oil inlet of the hydraulic motor in real time, the second pressure sensor is used to detect the pressure at the oil return port of the hydraulic motor in real time, and the first high-pressure manual ball valve and the second high-pressure manual ball valve are used to avoid hydraulic oil spraying when disassembling the oil circuit and can release pressure smoothly.

[0013] A filter and a flow meter are connected in sequence between the T port of the two-position four-way reversing valve and the second one-way valve. In this structure, the filter plays a role in further filtering impurities, and the flow meter is used to display the flow size of the oil circuit in real time.

[0014] Compared with the prior art, the advantages of the present invention are: the existing hydraulic motor is used to install the skeleton oil seal, which can better simulate the performance of the skeleton oil seal under real conditions; the oil circuit system plays a role in driving the hydraulic motor to rotate on the one hand, and on the other hand, it can build pressure on the shell cavity of the hydraulic motor to test the pressure resistance of the skeleton oil seal; the load simulation mechanism is connected to the output shaft of the hydraulic motor through the transmission shaft, and the load simulation mechanism is used to simulate the motor load, so as to test the performance of the skeleton oil seal under different load conditions; the present invention has a simple structure and can effectively test the performance of the skeleton oil seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the test state of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the skeleton oil seal in the present invention when it is installed and matched with the hydraulic motor;

[0017] Figure 3 It is a structural schematic diagram of the hydraulic motor in the present invention;

[0018] Figure 4 It is a principle block diagram of the hydraulic part in the present invention;

[0019] Figure 5 It is a principle block diagram of the circuit part in the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0021] Embodiment 1: As shown in the figure, a skeleton oil seal testing device includes a test bench 1, a mounting frame 2, a hydraulic motor 3, a slewing support frame 4, an oil circuit system 9 and a load simulation mechanism. The mounting frame 2, the slewing support frame 4 and the load simulation mechanism are respectively fixed on the test bench 1 at intervals, the hydraulic motor 3 is fixed on the mounting frame 2, and the hydraulic motor 3 is connected to the oil tank 5 through the oil circuit system 9. A skeleton oil seal 6 to be tested is installed on the output shaft of the hydraulic motor 3, and the skeleton oil seal 6 is located in the output cover of the hydraulic motor 3. A transmission shaft 41 is rotatably arranged on the slewing support frame 4, one end of the transmission shaft 41 is coaxially fixed to the output shaft of the hydraulic motor 3, and the other end of the transmission shaft 41 is coaxially fixed to the input end of the load simulation mechanism.

[0022] Embodiment 2: As shown in the figure, other structures are the same as those of embodiment 1, except that the load simulation mechanism includes a magnetic powder brake 7, which is fixed on the bench 1, and the input end of the magnetic powder brake 7 is fixed to the transmission shaft 41 through a first coupling 71. In this structure, the magnetic powder brake 7 is a prior art, which transmits torque based on the electromagnetic principle and utilizes magnetic powder, and can quickly adjust the torque according to the input current, so as to better simulate the performance of the skeleton oil seal 6 without torque.

[0023] The output end of the hydraulic motor 3 is fixed to the transmission shaft 41 via a second coupling 42. In this structure, the second coupling 42 is provided to connect the output end of the hydraulic motor 3 to the transmission shaft 41, so that the transmission shaft 41 rotates more smoothly.

[0024] The slewing support frame 4 is provided with a torque sensor 81 for detecting the torque of the transmission shaft 41 and a speed sensor 82 for detecting the speed of the transmission shaft 41. The torque sensor 81 and the speed sensor 82 are respectively electrically connected to a display 83. In this structure, the torque sensor 81 is used to detect the torque of the transmission shaft 41, and the speed sensor 82 is used to detect the speed of the transmission shaft 41. The two are respectively electrically connected to the display 83 through a signal line, so that the values ​​of the torque and the speed can be displayed in real time.

[0025] Embodiment 3: As shown in the figure, other structures are the same as those of Embodiment 2, except that the hydraulic motor 3 has an oil inlet port 31, an oil return port 32, a first oil drain port 33 and a second oil drain port 34, and the oil circuit system 9 includes a first oil suction filter 90, a variable pump 91, a first motor 92, a first non-return valve 93, a two-position four-way reversing valve 94, a first strong magnetic filter 95, a back pressure valve 96, a first throttle valve 97, a second throttle valve 98, a second strong magnetic filter 99, a second non-return valve 101, a heat exchanger 102 and an oil return filter 103, the oil inlet of the first oil suction filter 90 is connected to the oil tank 5, the output shaft of the first motor 92 is connected to the variable pump 91, the oil outlet of the first oil suction filter 90 is connected to the oil inlet of the variable pump 91, the oil outlet of the variable pump 91 is connected to the P port of the two-position four-way reversing valve 94, and the A port of the two-position four-way reversing valve 94 is connected to the first strong magnetic filter The oil inlet of the first strong magnetic filter 95 is connected to the oil inlet port 31 of the hydraulic motor 3, the oil inlet of the back pressure valve 96 is connected to the oil return port 32 of the hydraulic motor 3, the oil outlet of the back pressure valve 96 is connected to the oil inlet of the second strong magnetic filter 99, the oil outlet of the second strong magnetic filter 99 is connected to the B port of the two-position four-way reversing valve 94, the T port of the two-position four-way reversing valve 94 is connected to the oil inlet of the second check valve 101, and the oil inlet of the second check valve 101 is connected to the oil return port 32 of the hydraulic motor 3. The oil outlet of the second one-way valve 101 is connected to the oil inlet of the heat exchanger 102, the oil outlet of the heat exchanger 102 is connected to the oil tank 5 through the return oil filter 103, the oil inlet of the first throttle valve 97 is connected to the oil inlet of the back pressure valve 96, the oil outlet of the first throttle valve 97 is connected to the first oil drain port 33, the second oil drain port 34 is connected to the oil inlet of the second throttle valve 98, and the oil outlet of the second throttle valve 98 is connected to the oil tank 5.In this structure, the hydraulic oil coming out of the oil tank 5 is first filtered by the first oil suction filter 90 and then transmitted to the variable pump 91. The variable pump 91 is controlled by the first motor 92 and can adjust the oil suction amount. Then the variable pump 91 transports the hydraulic oil to the P port of the two-position four-way reversing valve 94, and then flows out from the A port of the two-position four-way reversing valve 94. After filtering and adsorbing by the first strong magnetic filter 95, it flows to the oil inlet port of the hydraulic motor 3, and then flows out from the oil return port of the hydraulic motor 3, thereby driving the hydraulic motor 3 to rotate. The hydraulic oil flowing out of the oil return port of the hydraulic motor 3 passes through the back pressure valve 96 and the second strong magnetic filter 99 in turn, and then flows to the B port of the two-position four-way reversing valve 94, and then flows out from the T port of the two-position four-way reversing valve 94. The setting of the back pressure valve 96 can adjust the oil pressure on the return oil pipeline. The hydraulic oil flowing out from the T port of the two-position four-way reversing valve 94 passes through the second one-way valve 101, the heat exchanger 102 and the return oil filter 103 in turn and flows back to the oil tank 5 to form a complete circulating oil circuit system 9. The heat exchanger 102 adopts a plate heat exchanger 102, which plays a role in rapid heat dissipation. The oil inlet of the first throttle valve 97 is connected to the oil inlet of the back pressure valve 96, so that part of the hydraulic oil flowing out from the return oil port of the hydraulic motor 3 enters the first oil drain port and then flows out from the second oil drain port. By adjusting the second throttle valve 98 and the first throttle valve 97, the required shell cavity pressure of the hydraulic motor 3 is achieved, thereby simulating the performance of the skeleton oil seal 6 under no pressure. In addition, the return oil pressure must always be higher than the shell cavity pressure to ensure the shell cavity pressure. The return oil pressure is adjusted by the back pressure valve 96 on the return oil pipeline.

[0026] The oil tank 5 is also connected to the second oil suction filter 104, the oil outlet of the second oil suction filter 104 is connected to the hydraulic pump 105, the hydraulic pump 105 is controlled by the servo motor 106, the oil outlet of the hydraulic pump 105 is connected to the third check valve 107, and the oil outlet of the third check valve 107 is connected to the P port of the two-position four-way reversing valve 94. In this structure, there are two routes to the P port of the two-position four-way reversing valve 94, one route is composed of the variable pump 91, and the other route is composed of the hydraulic pump 105. In this way, the required motor speed can be achieved by adjusting the flow of the variable pump 91 and the hydraulic pump 105, which is converted into the linear speed of the skeleton oil seal 6, and the structure is simple and practical.

[0027] The P port of the two-position four-way reversing valve 94 is also connected to the oil tank 5 through the overflow assembly 108. In this structure, the overflow assembly 108 is composed of two overflow valves, which play a role in safe pressure relief and ensure the smoothness and safety of the entire oil circuit.

[0028] The oil inlet of the hydraulic motor 3 is also connected in parallel with a first pressure sensor 109 and a first high-pressure manual ball valve 110, the oil outlet of the first high-pressure manual ball valve 110 is connected to the oil tank 5, and the oil outlet of the hydraulic motor 3 is also connected in parallel with a second pressure sensor 111 and a second high-pressure manual ball valve 112, the oil outlet of the second high-pressure manual ball valve 112 is connected to the oil tank 5. In this structure, the first pressure sensor 109 is used to detect the pressure at the oil inlet of the hydraulic motor 3 in real time, the second pressure sensor 111 is used to detect the pressure at the oil return port of the hydraulic motor 3 in real time, and the first high-pressure manual ball valve 110 and the second high-pressure manual ball valve 112 are used to avoid hydraulic oil spraying when disassembling the oil circuit, and can release pressure smoothly.

[0029] A filter 113 and a flow meter 114 are connected in sequence between the T port of the two-position four-way reversing valve 94 and the second one-way valve 101. In this structure, the filter 113 plays a role in further filtering impurities, and the flow meter 114 is used to display the flow size of the oil circuit in real time.

[0030] It is worth noting that the above is only a preferred embodiment of the present invention, and does not limit the scope of patent protection of the present invention. The present invention can also improve the materials and structures of the above-mentioned various parts, or replace them with technical equivalents. Therefore, all equivalent structural changes made by using the description and illustrations of the present invention, or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.

Claims

1. A skeleton oil seal testing device, characterized in that: It comprises a test bench, a mounting frame, a hydraulic motor, a slewing support frame, an oil circuit system and a load simulation mechanism, wherein the mounting frame, the slewing support frame and the load simulation mechanism are respectively fixed on the test bench at intervals, the hydraulic motor is fixed on the mounting frame, and the hydraulic motor is connected with an oil tank through the oil circuit system, a skeleton oil seal to be tested is installed on the output shaft of the hydraulic motor, and the skeleton oil seal is located in the output cover of the hydraulic motor, a transmission shaft is rotatably arranged on the slewing support frame, one end of the transmission shaft is coaxially fixed with the output shaft of the hydraulic motor, and the other end of the transmission shaft is coaxially fixed with the input end of the load simulation mechanism; The hydraulic motor has an oil inlet port, an oil return port, a first oil drain port and a second oil drain port. The oil circuit system includes a first oil suction filter, a variable pump, a first motor, a first non-return valve, a two-position four-way reversing valve, a first strong magnetic filter, a back pressure valve, a first throttle valve, a second throttle valve, a second strong magnetic filter, a second non-return valve, a heat exchanger and an oil return filter. The oil inlet of the first oil suction filter is connected to the oil tank, the output shaft of the first motor is connected to the variable pump, the oil outlet of the first oil suction filter is connected to the oil inlet of the variable pump, the oil outlet of the variable pump is connected to the P port of the two-position four-way reversing valve, the A port of the two-position four-way reversing valve is connected to the oil inlet of the first strong magnetic filter, and the oil outlet of the first strong magnetic filter is connected to the hydraulic motor. The oil inlet port of the back pressure valve is connected to the oil return port of the hydraulic motor, the oil outlet of the back pressure valve is connected to the oil inlet of the second strong magnetic filter, the oil outlet of the second strong magnetic filter is connected to the B port of the two-position four-way reversing valve, the T port of the two-position four-way reversing valve is connected to the oil inlet of the second one-way valve, the oil outlet of the second one-way valve is connected to the oil inlet of the heat exchanger, the oil outlet of the heat exchanger is connected to the oil tank through the return oil filter, the oil inlet of the first throttle valve is connected to the oil inlet of the back pressure valve, the oil outlet of the first throttle valve is connected to the first oil drain port, the second oil drain port is connected to the oil inlet of the second throttle valve, and the oil outlet of the second throttle valve is connected to the oil tank.

2. A skeleton oil seal testing device according to claim 1, characterized in that: The load simulation mechanism comprises a magnetic powder brake, which is fixed on the stand, and the input end of the magnetic powder brake is fixed to the transmission shaft through a first coupling.

3. A skeleton oil seal testing device according to claim 1, characterized in that: The output end of the hydraulic motor is fixed to the transmission shaft via a second coupling.

4. A skeleton oil seal testing device according to claim 1, characterized in that: A torque sensor for detecting the torque of the transmission shaft and a speed sensor for detecting the speed of the transmission shaft are installed on the slewing support frame. The torque sensor and the speed sensor are electrically connected to a display respectively.

5. A skeleton oil seal testing device according to claim 1, characterized in that: The oil tank is also connected to the second oil suction filter, the oil outlet of the second oil suction filter is connected to a hydraulic pump, the hydraulic pump is controlled by a servo motor, the oil outlet of the hydraulic pump is connected to a third one-way valve, and the oil outlet of the third one-way valve is connected to the P port of the two-position four-way reversing valve.

6. A skeleton oil seal testing device according to claim 1, characterized in that: The P port of the two-position four-way reversing valve is also connected to the oil tank through an overflow component.

7. A skeleton oil seal testing device according to claim 1, characterized in that: The oil inlet port of the hydraulic motor is also connected in parallel with a first pressure sensor and a first high-pressure manual ball valve, and the oil outlet of the first high-pressure manual ball valve is connected to the oil tank. The oil return port of the hydraulic motor is also connected in parallel with a second pressure sensor and a second high-pressure manual ball valve, and the oil outlet of the second high-pressure manual ball valve is connected to the oil tank.

8. A skeleton oil seal testing device according to claim 1, characterized in that: A filter element and a flow meter are connected in sequence between the T port of the two-position four-way reversing valve and the second one-way valve.

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