A hydraulic bearing load-bearing capacity test bench

Abstract

The present invention discloses a hydraulic bearing capacity test bench, which relates to the technical field of strength testing; in order to solve the lubrication problem; it specifically includes a stand supported on the ground by legs, a plurality of guide rails are fixed on the inner side of the stand, a slide seat is slidably connected to the upper sides of the guide rails, a hydraulic motor is fixed to the top outer wall of the slide seat by bolts, a shell is fixed to the upper middle part of the guide rail by bolts, a shell cover is provided on the top outer wall of the shell, a filter is installed on the top of the shell cover, and an oil drain nozzle is provided at the bottom of the shell. The present invention supplies oil to the filter by using a hydraulic integrated drive unit based on hydraulic drive, so that the bearing can be tested for bearing capacity when it is in a lubricated state during the test, and the filter can also filter oil to prevent impurities from damaging the bearing, so that the actual test conditions are consistent with the actual use conditions, and the accuracy of the test results is increased.

Description

Technical Field

[0001] The invention relates to the technical field of strength testing, and in particular to a hydraulic bearing load-bearing capacity testing platform. Background Art

[0002] Bearings are used to connect shafts and shaft seats. They convert sliding friction into rolling friction, thereby reducing friction resistance and friction loss. Bearings need to be tested for load capacity before leaving the factory, especially for angular contact bearings, thrust bearings and other bearings that bear axial loads. The axial load capacity test is more important.

[0003] After searching, the Chinese patent publication number CN221425956U discloses a bearing manufacturing load-bearing capacity detection device, including a base and a test bearing. A mounting frame is arranged on the base, a fixed seat is arranged on the top of the mounting frame, a cylinder is arranged on the fixed seat, a pressure assembly is arranged at the output end of the cylinder, a motor is arranged on the pressure assembly, and a first hydraulic telescopic rod is arranged on one side of the top of the mounting frame.

[0004] The above patent has the following deficiencies: while the inner and outer rings of the driving bearing rotate relative to each other, the load-bearing force is directly applied for testing, which will cause dry friction between the bearings. In actual use, the bearings are all used under lubrication, so the test conditions do not match the actual use conditions, and the corresponding test results do not match.

[0005] To this end, the present invention proposes a hydraulic bearing load-bearing capacity test bench. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a hydraulic bearing load-bearing capacity test bench.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A hydraulic bearing capacity test bench comprises a frame supported on the ground by legs,

[0009] A plurality of guide rails are fixed on the inner side of the platform, and a slide seat is slidably connected to the upper sides of the guide rails respectively, and a hydraulic motor is fixed to the top outer wall of the slide seat by bolts, and a housing is fixed to the upper middle part of the guide rail by bolts, and a housing cover is provided on the top outer wall of the housing, a filter is installed on the top of the housing cover, and an oil drain nozzle is provided at the bottom of the housing;

[0010] The output shafts of the hydraulic motors penetrate the side wall of the housing and fixed limiting components for limiting the inner and outer rings of the bearings are arranged on opposite sides of the output shafts of the two hydraulic motors;

[0011] The bottom outer wall of the slide is fixed with a load-bearing frame by bolts, the side wall of the load-bearing frame is fixed with a hydraulic rod by bolts, the other end of the hydraulic rod is fixed with a hydraulic piston by bolts, the outer wall of the hydraulic piston is slidably connected with a hydraulic cylinder fixed to the bottom of the guide rail, a limit ring is fixed to the middle inner wall of the hydraulic cylinder, and hydraulic nozzles communicating with the inner cavity of the hydraulic cylinder are arranged on both sides of the hydraulic cylinder;

[0012] A hydraulic integrated drive unit is provided at the bottom of the support leg, which supplies oil to the filter and receives the oil discharged from the oil discharge nozzle. At the same time, the hydraulic integrated drive unit is driven and connected to the hydraulic motor, the two hydraulic motors have opposite directions, and the hydraulic integrated drive unit supplies oil to and absorbs oil from the hydraulic nozzle.

[0013] Preferably: shaft sleeves are fixed to the inner walls on both sides of the housing, the output shaft of the hydraulic motor passes through the inner wall of the shaft sleeve, and the output shaft of the hydraulic motor and the shaft sleeve are clearance-matched.

[0014] Furthermore: the fixed limiting assembly includes a claw sleeve and a core shaft that cooperate with each other, the claw sleeve is coaxially fixed to the outer wall of the output shaft of one of the hydraulic motors, and the core shaft is fixed to the outer wall of the output shaft of the other hydraulic motor.

[0015] On the basis of the above-mentioned solution: the inner wall of the claw sleeve is provided with a step groove for limiting the outer ring of the bearing, and the outer wall of the core shaft is provided with a step shoulder for limiting the inner cavity of the bearing.

[0016] A better solution among the above-mentioned solutions is: the hydraulic integrated drive unit includes an oil tank fixed to the inner side of the bottom of the test bench and a two-way oil pump fixed to the oil port of the oil tank, the other end of the two-way oil pump is connected to a pressure three-way valve, one of the oil ports of the pressure three-way valve is directly connected to the hydraulic nozzle, the other oil port of the pressure three-way valve is connected to a three-way pipe, and the other two oil ports of the three-way pipe are respectively connected to the hydraulic motor and the filter.

[0017] As a further solution of the present invention: the pressure three-way valve includes a valve housing and an oil nozzle A arranged above the valve housing and connected to the two-way oil pump, an oil nozzle B arranged below the valve housing and connected to the hydraulic nozzle, and an oil nozzle C arranged below the valve housing and connected to the three-way pipe. A sliding plug valve core is slidably connected to the inner wall of the valve housing, a spring is arranged at the end of the sliding plug valve core, and a retaining ring for limiting the sliding plug valve core is arranged on the inner wall of the valve housing between the oil nozzles B and C.

[0018] At the same time, the other end of the spring is buckled with a slide plate, which is slidably connected to the inner cavity of the valve housing, and the other end of the slide plate is rotatably connected to an adjusting bolt, which is threadedly connected to the side wall of the valve housing.

[0019] As a preferred embodiment of the present invention: a heater for heating the oil is provided at the oil port of the three-way pipe connected to the filter, and a temperature sensor for sensing the temperature of the shell cover and the inner cavity of the shell is fixed to the side wall of the shell cover.

[0020] At the same time, the filter includes a filter seat fixed to the outer wall of the shell cover and an oil pipe fixed to the inner wall of the filter seat and connected to the shell body and the inner cavity of the shell cover. The outer wall of the filter seat is connected to the filter cover through an external threaded ring, and the inner side of the filter cover is provided with a filter element sleeved on the outer wall of the oil pipe.

[0021] As a more preferred solution of the present invention: both ends of the filter element are contacted and extruded to fit with the inner wall of the filter cover and the inner wall of the filter seat through sealing gaskets.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention, based on hydraulic drive, utilizes the hydraulic integrated drive unit to supply oil to the filter, so that the bearing can be tested for load-bearing capacity when it is in a lubricated state during the test, and the filter can also filter the oil to prevent impurities from damaging the bearing, so that the actual test conditions are consistent with the actual use conditions, thereby increasing the accuracy of the test results.

[0024] 2. The present invention uses a claw sleeve and a core shaft to limit the bearing, which is convenient for taking and placing the bearing on the one hand, and can fix bearings of different diameters on the other hand, thereby increasing the convenience of use.

[0025] 3. In the present invention, based on the fact that both the axial load of the bearing and the rotational drive are driven by hydraulics, the rotational drive is driven by a hydraulic motor. When the hydraulic motor is outputting, the solvent change rate in its inner cavity fluctuates, thereby causing the oil pressure at the inlet of the hydraulic motor to fluctuate. Furthermore, since the inlet of the hydraulic motor is connected to the hydraulic integrated drive unit, the pressure in the hydraulic integrated drive unit will fluctuate, causing the axial force on the bearing to fluctuate, thereby matching the load fluctuation of the bearing in actual use and further increasing the rationality of the test.

[0026] 4. The present invention, based on the fact that lubrication, rotational drive of the hydraulic motor and lateral drive of the hydraulic motor are all hydraulically driven, utilizes the ingenious pipeline design of the hydraulic integrated drive unit in conjunction with the unique structure of the pressure three-way valve. On the one hand, the drives of the three can all be driven by the same power source of the two-way oil pump, thereby increasing the linkage of each part; on the other hand, the bearing can be reliably limited and lubrication and rotational drive can only be performed after load is applied, and the switching process is automatically controlled by the reaction force of the applied load. In addition, the pressure three-way valve can automatically block the oil nozzle C path when resetting at the end of the test to prevent oil backflow at the filter and the hydraulic motor.

[0027] 5. The present invention, by providing components such as a spring, a slide plate, and an adjusting bolt, can change the oil pressure required for the sliding plug valve core to move by rotating the adjusting bolt, thereby changing the oil pressure of the oil flowing out through the oil nozzle B, thereby changing the axial load applied to the bearing, and thus the axial load can be changed specifically according to different test requirements.

[0028] 6. The present invention, by setting a heater, can control the test temperature of the bearing by controlling the temperature of the oil by the heater on the basis of oil lubrication, and can also feedback and adjust the heating power of the heater according to the temperature sensing of the temperature sensor, thereby realizing the testing of the bearing at different temperatures, and further increasing the comprehensiveness and rationality of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of a hydraulic bearing load-bearing capacity test bench proposed by the present invention;

[0030] Figure 2 This is a structural schematic diagram of a fixed limit assembly of a hydraulic bearing load-bearing capacity test bench proposed by the present invention;

[0031] Figure 3 This is a schematic structural diagram of the driving part of a slide seat of a hydraulic bearing load-bearing capacity test bench proposed by the present invention;

[0032] Figure 4 This is a structural schematic diagram of a hydraulic integrated drive unit of a hydraulic bearing load-bearing capacity test bench proposed by the present invention;

[0033] Figure 5 A schematic diagram of the structure of a pressure three-way valve of a hydraulic bearing load-bearing capacity test bench proposed by the present invention;

[0034] Figure 6 A schematic diagram of the piping structure of a hydraulic bearing load-bearing capacity test bench proposed by the present invention;

[0035] Figure 7 This is a schematic diagram of the internal structure of a filter of a hydraulic bearing load-bearing capacity test bench proposed by the present invention.

[0036] In the figure: 1, outrigger; 2, stand; 3, guide rail; 4, slide; 5, hydraulic motor; 6, housing; 7, housing cover; 8, filter; 9, fixed limit assembly; 10, oil drain nozzle; 11, hydraulic integrated drive unit; 12, claw sleeve; 13, step groove; 14, step shoulder; 15, mandrel; 16, load-bearing frame; 17, hydraulic rod; 18, hydraulic piston; 19, hydraulic cylinder; 20, limit ring; 21, hydraulic nozzle; 22, oil tank; 23. Two-way oil pump; 24. Pressure three-way valve; 25. Oil nozzle B; 26. Three-way pipe; 27. Heater; 28. Valve housing; 29. ​​Spring; 30. Slide plate; 31. Adjusting bolt; 32. Sliding plug valve core; 33. Oil nozzle C; 34. Retaining ring; 35. Oil nozzle A; 36. Temperature sensor; 37. Filter seat; 38. External thread ring; 39. Filter cover; 40. Filter element; 41. Sealing gasket; 42. Oil pipe; 43. Bushing. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. Example

[0039] A hydraulic bearing load-bearing capacity test bench, such as Figure 1-Figure 7 As shown, it includes a platform 2 supported on the ground by a support leg 1, a plurality of guide rails 3 are fixed on the inner side of the platform 2, a slide seat 4 is slidably connected to the upper side of both sides of the guide rail 3, a hydraulic motor 5 is fixed to the top outer wall of the slide seat 4 by bolts, a shell 6 is fixed to the upper middle part of the guide rail 3 by bolts, a shell cover 7 is provided on the top outer wall of the shell 6, a filter 8 is installed on the top of the shell cover 7, and an oil drain nozzle 10 is provided at the bottom of the shell 6.

[0040] The output shafts of the hydraulic motors 5 pass through the side wall of the housing 6 and a fixed limiting assembly 9 for limiting the inner and outer rings of the bearings is provided on opposite sides of the output shafts of the two hydraulic motors 5 .

[0041] A load-bearing frame 16 is fixed to the bottom outer wall of the slide 4 by bolts, a hydraulic rod 17 is fixed to the side wall of the load-bearing frame 16 by bolts, a hydraulic piston 18 is fixed to the other end of the hydraulic rod 17 by bolts, the outer wall of the hydraulic piston 18 is slidably connected to a hydraulic cylinder 19 fixed to the bottom of the guide rail 3, a limit ring 20 is fixed to the middle inner wall of the hydraulic cylinder 19, and hydraulic nozzles 21 connected to the inner cavity of the hydraulic cylinder 19 are arranged on both sides of the hydraulic cylinder 19.

[0042] A hydraulic integrated drive unit 11 is provided at the bottom of the support leg 1, which supplies oil to the filter 8 and receives the oil discharged from the oil discharge nozzle 10. At the same time, the hydraulic integrated drive unit 11 is driven and connected to the hydraulic motor 5. The two hydraulic motors 5 have opposite directions, and the hydraulic integrated drive unit 11 supplies oil and absorbs oil to the hydraulic nozzle 21.

[0043] In the present embodiment, there is no limitation on the specific connection method between the shell 6 and the shell cover 7, and they can be directly fixed with bolts, or with hinges on one side and bolts or snaps on the other side, or with sliding connections, etc. It is only necessary to ensure that the shell 6 and the shell cover 7 can be easily installed and separated to facilitate the removal and placement of the bearing, while also allowing the shell 6 and the shell cover 7 to form a relatively closed inner cavity.

[0044] When the device is in use, the bearing can be limited by the fixed limit assembly 9, and then the oil can be input into the inner cavity of the hydraulic cylinder 19 through the hydraulic nozzle 21 through the hydraulic integrated drive unit 11, and then the oil pressure hydraulic piston 18 can be moved inward, so that the slide 4 can be pulled through the hydraulic rod 17 and the load-bearing frame 16, so that the two hydraulic motors 5 are close to each other and apply axial force to the bearing, and then the hydraulic integrated drive unit 11 drives the two hydraulic motors 5 to rotate in the opposite direction, so that the inner and outer rings of the bearing rotate relative to each other, and oil is supplied to the filter 8 through the hydraulic integrated drive unit 11. After being filtered by the filter 8, the oil is sprayed onto the bearing limited by the fixed limit assembly 9 to lubricate the bearing, and then the oil is discharged from the oil discharge nozzle 10 by gravity and then received by the hydraulic integrated drive unit 11 to achieve the bearing capacity test.

[0045] This device, based on hydraulic drive, uses the hydraulic integrated drive unit 11 to supply oil to the filter 8, so that the bearing can be tested for load-bearing capacity when it is in a lubricated state during the test, and the filter 8 can also filter the oil to prevent impurities from damaging the bearing, so that the actual test conditions are consistent with the actual use conditions, thereby increasing the accuracy of the test results.

[0046] In order to solve the relative sealing problem; Figure 1 As shown, shaft sleeves 43 are fixed to the inner walls on both sides of the housing 6 , and the output shaft of the hydraulic motor 5 passes through the inner wall of the shaft sleeve 43 , and the output shaft of the hydraulic motor 5 and the shaft sleeve 43 are clearance-matched.

[0047] By providing the shaft sleeve 43 , a relative seal can be achieved to prevent the oil from splashing out directly from the gap between the output shaft of the hydraulic motor 5 and the housing 6 .

[0048] To solve the fixed problem; Figure 2As shown, the fixed limiting assembly 9 includes a claw sleeve 12 and a core shaft 15 that cooperate with each other. The claw sleeve 12 is coaxially fixed to the outer wall of the output shaft of one of the hydraulic motors 5, and the core shaft 15 is fixed to the outer wall of the output shaft of the other hydraulic motor 5.

[0049] The inner wall of the claw sleeve 12 is provided with a step groove 13 for limiting the outer ring of the bearing, and the outer wall of the core shaft 15 is provided with a step shoulder 14 for limiting the inner cavity of the bearing.

[0050] When in use, the inner ring of the bearing can be first sleeved on the outer wall of the step shoulder 14 or the outer ring of the bearing can be clamped on the inner wall of the step groove 13. Then the two hydraulic motors 5 will move closer to each other, which will make the claw sleeve 12 and the core shaft 15 move closer to each other, so that the step groove 13 and the outer ring of the bearing are in contact with each other to limit the position or the step shoulder 14 and the inner ring of the bearing are in contact, thereby achieving limit and pressure.

[0051] The device uses the claw sleeve 12 and the core shaft 15 to limit the bearing, which is convenient for taking and placing the bearing, and can fix bearings of different diameters, thereby increasing the convenience of use.

[0052] In order to solve the hydraulic drive problem; such as Figure 4 As shown, the hydraulic integrated drive unit 11 includes an oil tank 22 fixed to the inner side of the bottom of the stand 2 and a two-way oil pump 23 fixed to the oil port of the oil tank 22, the other end of the two-way oil pump 23 is connected to a pressure three-way valve 24, one of the oil ports of the pressure three-way valve 24 is directly connected to the hydraulic nozzle 21, and the other oil port of the pressure three-way valve 24 is connected to a three-way pipe 26, and the other two oil ports of the three-way pipe 26 are respectively connected to the hydraulic motor 5 and the filter 8.

[0053] The pressure three-way valve 24 includes a valve housing 28 and an oil nozzle A35 arranged above the valve housing 28 and connected to the two-way oil pump 23, an oil nozzle B25 arranged below the valve housing 28 and connected to the hydraulic nozzle 21, and an oil nozzle C33 arranged below the valve housing 28 and connected to the three-way pipe 26. A sliding plug valve core 32 is slidably connected to the inner wall of the valve housing 28, a spring 29 is arranged at the end of the sliding plug valve core 32, and a retaining ring 34 for limiting the sliding plug valve core 32 is arranged on the inner wall of the valve housing 28 between the oil nozzles B25 and C33.

[0054] During the test, after the bearing is limited to the claw sleeve 12 or the core shaft 15, the two-way oil pump 23 is started, which pumps the oil in the oil tank 22 to the oil nozzle A35 of the pressure three-way valve 24. At this time, since the sliding plug valve core 32 is affected by the elastic force of the spring 29, it is located at the position of blocking the oil nozzle C33. The oil flowing into the valve housing 28 flows into the hydraulic nozzle 21 through the oil nozzle B25, so that the two hydraulic pistons 18 are close to each other, thereby making the two hydraulic motors 5 close to each other, until the claw sleeve 12 and the core shaft 15 contact the bearing at the same time, the two-way oil pump 23 continues to transport oil, and uses the oil pressure to make the claw sleeve 12 and the core shaft 15 apply equal and opposite forces to the inner and outer rings of the bearing, thereby applying axial force, and at the same time, when the required After the required axial force is applied, the sliding plug valve core 32 will also move due to the liquid pressure to overcome the elastic force of the spring 29 until the oil nozzle C33 leaks out. The oil delivered by the two-way oil pump 23 will flow through the oil nozzle C33 while maintaining the pressure state of the oil nozzle B25 passage, and then drive the hydraulic motor 5 to rotate after the diversion through the three-way pipe 26, and lubricate through the filter 8 on the other hand. After the test, the two-way oil pump 23 is started in the reverse direction. At this time, the oil pressure in the inner cavity of the valve housing 28 disappears and becomes negative pressure. At the same time, the sliding plug valve core 32 is reset to block the oil nozzle C33. The two-way oil pump 23 draws the oil in the inner cavity of the hydraulic cylinder 19 through the oil nozzle B25, and the hydraulic piston 18 moves outward. Then the housing cover 7 is opened to take out the bearing.

[0055] In addition, based on the fact that both the axial load of the bearing and the rotational drive of the device are hydraulic, the rotational drive is driven by a hydraulic motor 5. When the hydraulic motor 5 outputs, the solvent change rate in its inner cavity fluctuates, thereby causing the oil pressure at the inlet of the hydraulic motor 5 to fluctuate. Furthermore, since the inlet of the hydraulic motor 5 is connected to the hydraulic integrated drive unit 11, the pressure in the hydraulic integrated drive unit 11 will fluctuate, causing the axial force on the bearing to fluctuate, thereby matching the load fluctuation of the bearing in actual use and further increasing the rationality of the test.

[0056] This device, based on the fact that lubrication, rotational drive of the hydraulic motor 5, and lateral drive of the hydraulic motor 5 are all hydraulically driven, utilizes the ingenious pipeline design of the hydraulic integrated drive unit 11 and the unique structure of the pressure three-way valve 24. On the one hand, the drives of the three can all be driven by the same power source of the two-way oil pump 23, thereby increasing the linkage of each part; on the other hand, it can also reliably limit the bearing and lubricate and rotate only after the load is applied, and the switching process is automatically controlled by the reaction force of the applied load. In addition, the pressure three-way valve 24 can automatically block the oil nozzle C33 path when resetting at the end of the test to prevent the oil from flowing back to the filter 8 and the hydraulic motor 5.

[0057] In order to solve the load regulation problem; Figure 5As shown, the other end of the spring 29 is buckled with a slide plate 30, which is slidably connected to the inner cavity of the valve housing 28, and the other end of the slide plate 30 is rotatably connected to an adjusting bolt 31, which is threadedly connected to the side wall of the valve housing 28.

[0058] When the adjusting bolt 31 is rotated, it will move axially through the threaded connection with the valve housing 28, thereby causing the slide plate 30 to move axially, changing the compression amount of the spring 29, so that the elastic force of the spring 29 on the sliding plug valve core 32 changes, thereby changing the oil pressure required for the sliding plug valve core 32 to move, thereby changing the oil pressure of the oil flowing out through the oil nozzle B25, and thus changing the axial load applied to the bearing.

[0059] The device is provided with components such as a spring 29, a slide plate 30, and an adjusting bolt 31. By rotating the adjusting bolt 31, the oil pressure required for the sliding plug valve core 32 to move can be changed, thereby changing the oil pressure of the oil flowing out through the oil nozzle B25, thereby changing the axial load applied to the bearing, so that the axial load can be changed specifically according to different test requirements.

[0060] In order to solve the temperature control problem, the three-way pipe 26 is connected to the oil port of the filter 8 and is provided with a heater 27 for heating the oil, and the side wall of the shell cover 7 is fixed with a temperature sensor 36 for sensing the temperature of the shell cover 7 and the inner cavity of the shell 6.

[0061] Since the temperature of the bearing varies when it is running, the device is provided with a heater 27. On the one hand, it can control the test temperature of the bearing by controlling the temperature of the oil by the heater 27 on the basis of oil lubrication. On the other hand, it can also feedback and adjust the heating power of the heater 27 according to the temperature sensing of the temperature sensor 36, thereby realizing the testing of the bearing at different temperatures, further increasing the comprehensiveness and rationality of the test.

[0062] When this embodiment is in use, the inner ring of the bearing can be sleeved on the outer wall of the step shoulder 14 or the outer ring of the bearing can be clamped on the inner wall of the step groove 13, and the two-way oil pump 23 can be started to pump the oil in the oil tank 22 to the oil nozzle A35 of the pressure three-way valve 24. At this time, since the sliding plug valve core 32 is affected by the elastic force of the spring 29, it is located at the position of blocking the oil nozzle C33. The oil flowing into the valve housing 28 flows into the hydraulic nozzle 21 through the oil nozzle B25, so that the two hydraulic pistons 18 are close to each other, thereby making the two hydraulic motors 5 close to each other until the claw sleeve 12 and the core shaft 15 contact the bearing at the same time. After that, the two-way oil pump 23 continues to deliver oil, using the oil pressure to make the claw sleeve 12 and the core shaft 15 apply equal and opposite forces to the inner and outer rings of the bearing, thereby applying axial force, and at the same time, after the required axial force is reached, the sliding plug valve core 32 will also move due to the hydraulic pressure to overcome the elastic force of the spring 29 until the oil nozzle C33 leaks out. The oil delivered by the two-way oil pump 23 will flow through the oil nozzle C33 while maintaining the pressure state of the oil nozzle B25 passage, and then after the diversion of the three-way pipe 26, it will drive the hydraulic motor 5 to rotate on the one hand, and lubricate it through the filter 8 on the other hand, and measure After the test is completed, the two-way oil pump 23 is started in the reverse direction. At this time, the oil pressure in the inner cavity of the valve housing 28 disappears and becomes negative pressure. At the same time, the sliding plug valve core 32 is reset to block the oil nozzle C33. The two-way oil pump 23 extracts the oil in the inner cavity of the hydraulic cylinder 19 through the oil nozzle B25, and the hydraulic piston 18 moves outward. Then, the housing cover 7 is opened to take out the bearing. At the same time, when the adjusting bolt 31 is rotated, it will move axially through the threaded connection with the valve housing 28, so that the slide plate 30 will move axially, changing the compression amount of the spring 29, so that the elastic force of the spring 29 on the sliding plug valve core 32 changes, thereby changing the sliding The oil pressure required for the movement of the plug valve core 32 changes the oil pressure of the oil flowing out through the oil nozzle B25, thereby changing the axial load applied to the bearing. In addition, since the temperature of the bearing is different when it is running, the device is provided with a heater 27. On the one hand, it can control the test temperature of the bearing by controlling the temperature of the oil by the heater 27 on the basis of oil lubrication. On the other hand, it can also feedback and adjust the heating power of the heater 27 according to the temperature sensing of the temperature sensor 36, thereby realizing the testing of the bearing at different temperatures, further increasing the comprehensiveness and rationality of the test. Example

[0063] A hydraulic bearing load-bearing capacity test bench, such as Figure 7As shown, in order to solve the filtering problem, this embodiment makes the following improvements on the basis of embodiment 1: the filter 8 includes a filter seat 37 fixed to the outer wall of the shell cover 7 and an oil pipe 42 fixed to the inner wall of the filter seat 37 and connected to the inner cavity of the shell 6 and the shell cover 7. The outer wall of the filter seat 37 is connected to the filter cover 39 through an external threaded ring 38. The inner side of the filter cover 39 is provided with a filter element 40 sleeved on the outer wall of the oil pipe 42. Both ends of the filter element 40 are contacted and extruded to the inner wall of the filter cover 39 and the inner wall of the filter seat 37 through a sealing gasket 41.

[0064] When the present embodiment is in use, oil can enter through one side of the filter cover 39 , and then flow into the shell cover 7 through the oil pipe 42 after being filtered by the filter element 40 .

[0065] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydraulic bearing capacity test bench, comprising a stand (2) supported on the ground by legs (1), characterized in that: A plurality of guide rails (3) are fixed on the inner side of the platform (2), a slide seat (4) is slidably connected to the upper sides of the guide rails (3), a hydraulic motor (5) is fixed to the top outer wall of the slide seat (4) by bolts, a housing (6) is fixed to the upper middle part of the guide rails (3) by bolts, a housing cover (7) is provided on the top outer wall of the housing (6), a filter (8) is installed on the top of the housing cover (7), and an oil drain nozzle (10) is provided at the bottom of the housing (6); The output shaft of the hydraulic motor (5) passes through the side wall of the housing (6), and a fixed limiting assembly (9) for limiting the inner ring and outer ring of the bearing is provided on opposite sides of the output shafts of the two hydraulic motors (5); A load-bearing frame (16) is fixed to the bottom outer wall of the slide seat (4) by bolts, a hydraulic rod (17) is fixed to the side wall of the load-bearing frame (16) by bolts, a hydraulic piston (18) is fixed to the other end of the hydraulic rod (17) by bolts, the outer wall of the hydraulic piston (18) is slidably connected to a hydraulic cylinder (19) fixed to the bottom of the guide rail (3), a limit ring (20) is fixed to the middle inner wall of the hydraulic cylinder (19), and hydraulic nozzles (21) connected to the inner cavity of the hydraulic cylinder (19) are arranged on both sides of the hydraulic cylinder (19); A hydraulic integrated drive unit (11) is provided at the bottom of the support leg (1), the hydraulic integrated drive unit (11) supplies oil to the filter (8) and receives oil discharged from the oil discharge nozzle (10), and the hydraulic integrated drive unit (11) is driven and connected to the hydraulic motor (5), the two hydraulic motors (5) rotate in opposite directions, and the hydraulic integrated drive unit (11) supplies oil to and absorbs oil from the hydraulic nozzle (21); The fixed limit assembly (9) comprises a claw sleeve (12) and a core shaft (15) that cooperate with each other, the claw sleeve (12) being coaxially fixed to the outer wall of the output shaft of one of the hydraulic motors (5), and the core shaft (15) being fixed to the outer wall of the output shaft of the other hydraulic motor (5); The inner wall of the claw sleeve (12) is provided with a step groove (13) for limiting the outer ring of the bearing, and the outer wall of the core shaft (15) is provided with a step shoulder (14) for limiting the inner cavity of the bearing.

2. A hydraulic bearing load capacity test bench according to claim 1, characterized in that: Shaft sleeves (43) are fixed to the inner walls on both sides of the housing (6), and the output shaft of the hydraulic motor (5) passes through the inner wall of the shaft sleeve (43), and the output shaft of the hydraulic motor (5) and the shaft sleeve (43) are clearance-matched.

3. A hydraulic bearing capacity test bench according to claim 1, characterized in that: The hydraulic integrated drive unit (11) comprises an oil tank (22) fixed to the inner side of the bottom of the platform (2) and a two-way oil pump (23) fixed to the oil port of the oil tank (22); the other end of the two-way oil pump (23) is connected to a pressure three-way valve (24); one of the oil ports of the pressure three-way valve (24) is directly connected to the hydraulic nozzle (21); the other oil port of the pressure three-way valve (24) is connected to a three-way pipe (26); the other two oil ports of the three-way pipe (26) are respectively connected to the hydraulic motor (5) and the filter (8).

4. A hydraulic bearing load capacity test bench according to claim 3, characterized in that: The pressure three-way valve (24) comprises a valve housing (28), an oil nozzle A (35) arranged above the valve housing (28) and connected to a two-way oil pump (23), an oil nozzle B (25) arranged below the valve housing (28) and connected to a hydraulic nozzle (21), and an oil nozzle C (33) arranged below the valve housing (28) and connected to a three-way pipe (26); a sliding plug valve core (32) is slidably connected to the inner wall of the valve housing (28); a spring (29) is arranged at the end of the sliding plug valve core (32); and a retaining ring (34) for limiting the position of the sliding plug valve core (32) is arranged on the inner wall of the valve housing (28) between the oil nozzle B (25) and the oil nozzle C (33).

5. A hydraulic bearing load capacity test bench according to claim 4, characterized in that: The other end of the spring (29) is buckled with a slide plate (30), which is slidably connected to the inner cavity of the valve housing (28), and the other end of the slide plate (30) is rotatably connected to an adjusting bolt (31), which is threadedly connected to the side wall of the valve housing (28).

6. A hydraulic bearing capacity test bench according to claim 4, characterized in that: The three-way pipe (26) is connected to the oil port of the filter (8) and is provided with a heater (27) for heating the oil, and a temperature sensor (36) for sensing the temperature of the inner cavity of the shell cover (7) and the housing (6) is fixed to the side wall of the shell cover (7).

7. The hydraulic bearing capacity test bench according to claim 1, characterized in that: The filter (8) comprises a filter seat (37) fixed to the outer wall of the shell cover (7) and an oil pipe (42) fixed to the inner wall of the filter seat (37) and connected to the inner cavity of the shell body (6) and the shell cover (7); the outer wall of the filter seat (37) is connected to the filter cover (39) via an external threaded ring (38); and a filter element (40) is provided on the inner side of the filter cover (39) and is sleeved on the outer wall of the oil pipe (42).

8. The hydraulic bearing capacity test bench according to claim 7, characterized in that: Both ends of the filter element (40) are contacted and extruded to fit with the inner wall of the filter cover (39) and the inner wall of the filter seat (37) through sealing gaskets (41).

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