A spherical bearing life test device with axial and radial coordinated fixation

Abstract

The present invention discloses a joint bearing life test device with axial and radial coordinated fixation, which relates to the technical field of bearing life test, including a test shaft, one end of which is connected to a driving mechanism, a rotatable lever amplifying device is provided above the test shaft, and a force-applying component for applying pressure to the other end of the test shaft is provided below the lever amplifying device; an axial tightening component is installed on the outside of the test shaft, a tightening hole is provided through the inside of the test shaft along the axial direction, a matching hole connected to the tightening hole is provided radially, and a radial tightening component is provided in the tightening hole to radially tighten the test bearing on the test shaft through the matching hole. The present invention fixes the test bearing through the axial tightening component and the radial tightening component, which can ensure the tightening of the test bearing during the test process and the accuracy of the test; and the stability of the loading force is ensured by cooperating with the force-applying component through the lever amplifying device.

Description

Technical Field

[0001] The invention relates to the technical field of bearing life testing, and in particular to a spherical bearing life testing device with axial and radial coordinated fixation. Background Art

[0002] The most direct and effective way to evaluate the life of spherical bearings under simulated working conditions is to use a spherical bearing life assessment test platform. Currently, there are a series of spherical bearing life test instruments, such as: CN 102221462A discloses a spherical bearing test detection device, CN 203324915U discloses a large constant load spherical bearing life testing machine, and CN106769038A discloses a combined loading motion spherical bearing testing machine.

[0003] Since the radial spherical plain bearing is only composed of an inner ring and an outer ring, the tightening method used in the test machine is to tighten the inner ring axially. During the long-term reciprocating swing process, the surface roughness of the tightened contact surface is easily reduced due to the reciprocating motion, which leads to a reduction in clamping force and eventually causes the inner ring and the shaft to slip. In actual engineering, the inner ring and the shaft of the radial spherical plain bearing adopt a transition fit, so the two rarely slip. If the life assessment evaluation test adopts the transition fit method, it will cause inconvenience in installation and testing. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a spherical bearing life test equipment with axial and radial coordinated fixation. The test bearing is fixed by an axial tightening assembly and a radial tightening assembly, which can ensure the tightening of the test bearing during the test and the accuracy of the test; and the stability of the loading force is ensured by a lever amplification device in combination with a force assembly.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] The embodiment of the present invention provides a spherical bearing life test device with axial and radial coordinated fixation, comprising a test shaft, one end of which is connected to a driving mechanism, a rotatable lever amplification device is provided above the test shaft, and a force-applying component for applying pressure to the other end of the test shaft is provided below the lever amplification device;

[0007] An axial clamping assembly is installed on the outside of the test shaft, a penetrating clamping hole is opened axially inside the test shaft, a matching hole connected to the clamping hole is opened radially, and a radial clamping assembly is arranged in the clamping hole to radially tighten the test bearing on the test shaft through the matching hole.

[0008] As a further implementation, the force-adding assembly includes a force-adding bracket and a pressure bearing mounted on the force-adding bracket;

[0009] The force-adding bracket is connected with the lever amplifying device through a vertical force transmission component, and the slide rail components are symmetrically installed on both sides of the force-adding bracket so that the force-adding bracket moves vertically when the lever amplifying device rotates.

[0010] As a further implementation, the vertical force transmission assembly includes a rod end ball bearing and a pressure plate connected to the rod end ball bearing, a force bracket is installed in the pressure plate, and a pressure sensor is installed between the force bracket and the rod end ball bearing.

[0011] As a further implementation, the lever amplification device includes an amplification rod, one end of which is connected to a counterweight, and the other end of which is connected to a tray for placing weights; the amplification rod is hinged to a support seat.

[0012] As a further implementation, the tightening hole is a threaded hole, the radial tightening assembly includes a first tightening rod and a second tightening rod that are arranged opposite to each other, and a radial tightening block corresponding to the matching hole is provided between the first tightening rod and the second tightening rod.

[0013] As a further implementation, the corresponding ends of the first tightening rod and the second tightening rod are respectively provided with inclined end faces, and the radial tightening block has side faces adapted to the end faces; the end of the second tightening rod extends out of the tightening hole.

[0014] As a further implementation, the matching holes are arranged in pairs, and the matching holes are fan-shaped holes; a groove for radially moving the clamping block is provided inside the fan-shaped hole.

[0015] As a further implementation, the axial tightening assembly includes an inner ring clamp and an outer ring clamp, and the outer ring clamp is connected to the temperature control device through a temperature control tube.

[0016] As a further implementation, the driving mechanism includes a power source and a transmission mechanism connected to the power source, wherein the transmission mechanism is disposed in the vacuum chamber.

[0017] As a further implementation, the transmission mechanism includes a torque sensor and a rotary joint connected in sequence, a temperature control shaft connected to the test shaft is installed in the rotary joint, and the rotary joint is connected to the temperature control device through a temperature control tube.

[0018] The beneficial effects of the present invention are as follows:

[0019] (1) An axial tightening assembly is installed on the outer side of the test shaft of the present invention to axially tighten the test bearing, and a radial tightening assembly is arranged inside the test shaft to radially tighten the test bearing on the test shaft through the matching hole, thereby ensuring stable fixation of the test bearing. This solves the problem of the traditional bearing tightening inner ring method that the tightening contact surface slips during long-term reciprocating motion, causing the inner ring and the shaft to be unable to maintain relative motion.

[0020] (2) The radial tightening assembly of the present invention includes a first tightening rod, a radial tightening block and a second tightening rod which are arranged inside the test shaft, and the second tightening rod extends out of the test shaft by a certain length so as to generate a thrust on the radial tightening block by rotating the second tightening rod, so that the radial tightening block moves radially along the matching hole on the test shaft, thereby realizing radial fixation of the test bearing; the axial tightening assembly includes an inner ring clamp and an outer ring clamp, thereby realizing simultaneous axial fixation of the inner and outer rings of the test bearing, and the inner ring clamp cooperates with the clamping nut to facilitate adjustment of the clamping force.

[0021] (3) The present invention adopts a weight loading method, which effectively reduces the mechanical motion mechanism inside the vacuum chamber and ensures the stability of the loading force; at the same time, a force amplification mechanism composed of an amplification rod, a counterweight and a weight is designed to achieve amplification of different proportions and meet the service condition testing requirements of the spherical bearing.

[0022] (4) The pressure bearing and the pressure bracket of the present invention are connected to the pressure plate, and a pressure sensor is arranged between the pressure bracket and the rod end ball bearing. The pressure bearing realizes loading on the test shaft under the rotation of the amplifying rod, thereby ensuring accurate control of the loading force. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 is a front view of the present invention according to one or more embodiments;

[0025] Figure 2 is a top view of the present invention according to one or more embodiments;

[0026] Figure 3 is a schematic diagram of the structure of a test part according to one or more embodiments of the present invention;

[0027] Figure 4 is a top view of a test portion according to one or more embodiments of the present invention;

[0028] Figure 5 is a cross-sectional view of a test portion according to one or more embodiments of the present invention;

[0029] Figure 6 is a schematic structural diagram of a tightening assembly and a force-applying assembly according to one or more embodiments of the present invention;

[0030] Figure 7 It is a partial enlarged view of the structural schematic diagram of the tightening assembly and the force-applying assembly according to one or more embodiments of the present invention;

[0031] FIG8( a) is a top view of a test shaft according to one or more embodiments of the present invention;

[0032] FIG8( b ) is a cross-sectional view taken along line AA of FIG8( a );

[0033] Fig. 9 is a front view of a test shaft according to one or more embodiments of the present invention.

[0034] Among them, 1. servo motor, 2. vacuum chamber, 3. vacuum tube, 4. main control box, 5. vacuum equipment, 6. temperature control equipment, 7. first temperature control tube, 101. flange, 102. torque sensor, 103. coupling, 104. rotary joint, 105. counterweight, 106. amplifying rod, 107. support plate, 108. slider, 109. weight, 1010. support seat, 1011. temperature control shaft, 1012. slide rail, 1013. second temperature control tube, 1014. first bracket, 1015. second bracket, 1016. third bracket, 1017. The fourth bracket, 1018. The outer ring clamp, 1019. The magnetic fluid sealing shaft, 1020. The pressure bearing, 1021. The self-aligning ball bearing, 1022. The rod end ball bearing, 1023. The pressure plate, 1024. The pressure sensor, 1025. The force bracket, 1026. The mounting shaft, 1027. The tray, 1028. The radial clamping block, 1029. The inner ring clamp, 1030. The clamping nut, 1031. The second clamping rod, 1032. The bolt, 1033. The first clamping rod, 1034. The test shaft, 1035. The matching hole. DETAILED DESCRIPTION

[0035] Embodiment 1:

[0036] This embodiment provides a spherical plain bearing life test device with axial and radial coordinated fixation, which is particularly suitable for coated self-lubricating spherical plain bearings, such as Figure 1 and Figure 2 As shown, it includes a driving mechanism, a test shaft 1034, a lever amplifying device, a force-applying component, etc. The life test of this embodiment is carried out in a vacuum environment, that is, except for the power source part of the driving mechanism, the remaining devices such as the test shaft 1034 and the lever amplifying device are all arranged in the vacuum chamber 2; the vacuum chamber 2 is connected to the vacuum equipment 5 through the vacuum tube 3.

[0037] Of course, in other embodiments, the life test may not be performed in a vacuum environment.

[0038] like Figure 3 and Figure 4 As shown, the driving mechanism includes a power source and a transmission mechanism. The power source of this embodiment adopts a servo motor 1. In order to realize the reciprocating swinging motion of the coated self-lubricating spherical bearing, the servo motor 1 is directly reciprocated.

[0039] The servo motor 1 is installed on the outside of the vacuum chamber 2 through the flange 101 . The servo motor 1 is connected to the magnetic fluid sealing shaft 1019 , the torque sensor 102 , and the temperature control shaft 1011 in sequence. The temperature control shaft 1011 is connected to the test shaft 1034 through the coupling 103 .

[0040] The bottom of the torque sensor 102 is supported by the first bracket 1014, and a rotary joint 104 is installed on the temperature control shaft 1011, and the rotary joint 104 is supported by the second bracket 1015. The rotary joint 104 has a through hole in the radial direction, and the through hole is connected to the temperature control device 6 through the first temperature control tube 7 to achieve cooling and heating of the transmission part.

[0041] like Figure 5 As shown, a self-aligning ball bearing 1021 is installed at one end of the test shaft 1034 close to the rotary joint 104, and the bottom of the self-aligning ball bearing 1021 is supported by the fourth bracket 1017. The self-aligning ball bearing 1021 is used to balance the test torque of the spherical bearing to ensure the accuracy of the test.

[0042] The test bearing is mounted on the test shaft 1034. The test bearing in this embodiment is a spherical bearing. The outer ring fixture 1018 and the inner ring fixture 1029 for axially tightening the spherical bearing are mounted on the outer side of the test shaft 1034. The radial tightening assembly for radially tightening the spherical bearing is arranged inside the test shaft 1034.

[0043] The inner ring fixture 1029 clamps the inner ring of the spherical bearing and is installed in the axial direction of the test shaft 1034. In order to further maintain the fixation of the inner ring of the bearing, two inner ring fixtures 1029 are symmetrically arranged relative to the spherical bearing. The inner ring fixtures 1029 can be implemented using existing technology as long as they can clamp the inner ring of the bearing. One of the inner ring fixtures 1029 fits against the shoulder of the test shaft 1034, and at least two clamping nuts 1030 are arranged on the side of the other inner ring fixture 1029, and the inner ring of the spherical bearing is clamped and fixed by rotating the clamping nuts 1030.

[0044] In this embodiment, the area where the inner ring fixture 1029 contacts the inner ring of the test bearing is provided with micro-texture to increase its friction.

[0045] The outer ring fixture 1018 includes a support body and a clamping part connected to the top of the support body. The clamping part has two clamping surfaces adapted to the spherical plain bearing. The top of the clamping surface is connected by bolts 1032 to clamp and fix the outer ring of the spherical plain bearing. The support body is connected to the temperature control device 6 through the second temperature control tube 1013 to adjust the ambient temperature required by the spherical plain bearing, which is used to provide high and low temperature working conditions testing for the coated self-lubricating spherical plain bearing.

[0046] like Figure 6 and Figure 7As shown, a tightening hole is axially opened inside the test shaft 1034. In order to facilitate the movement of the radial tightening assembly, the tightening hole of this embodiment is a threaded hole. The radial tightening assembly includes a first tightening rod 1033, a second tightening rod 1031 and a radial tightening block 1028. The outer surfaces of the first tightening rod 1033 and the second tightening rod 1031 are both provided with threads adapted to the tightening hole; the first tightening rod 1033 is screwed into one end of the tightening hole, and the second tightening rod 1031 is screwed into the other end of the tightening hole.

[0047] Furthermore, the end of the second tightening rod 1031 extends out of the tightening hole by a certain length, so that the radial tightening block 1028 can be pushed by rotating the second tightening rod 1031 .

[0048] The radial tightening block 1028 is arranged between the first tightening rod 1033 and the second tightening rod 1031. In order to ensure that the radial tightening block 1028 can radially load the spherical bearing, matching holes 1035 are opened in pairs at the position where the spherical bearing is installed on the test shaft 1034, and the matching holes 1035 are connected to the tightening holes.

[0049] In this embodiment, two matching holes 1035 are provided, as shown in FIG8(a), FIG8(b) and Fig. 9 As shown, the two matching holes 1035 are symmetrically arranged relative to the axis of the test shaft 1034. A radial tightening block 1028 is provided in each matching hole 1035. By rotating the second tightening rod 1031 to squeeze it inward, the radial tightening block 1028 moves along the matching hole 1035 to achieve radial tightening of the spherical bearing.

[0050] The first tightening rod 1033 and the second tightening rod 1031 are respectively provided with inclined end faces at their ends close to each other, and the radial tightening block 1028 has a side surface adapted to the end face, so that the first tightening rod 1033 and the second tightening rod 1031 form a thrust on the radial tightening block 1028 .

[0051] In this embodiment, the matching hole 1035 is a fan-shaped hole, and a groove is provided inside the fan-shaped hole. The side surface of the radial tightening block 1028 matches with the groove so as to move along the groove.

[0052] In this embodiment, a lever amplification device cooperates with a force-applying component to radially load the end of the test shaft 1034 away from the temperature control shaft 1011, such as Figure 5 and Figure 6As shown, the lever magnification device includes a magnification rod 106, a counterweight 105, and a tray 1027 for placing a weight 109. The magnification rod 106 is arranged at a set height above the test shaft 1034. One end of the magnification rod 106 is connected to the counterweight 105, and the other end is connected to the tray 1027. The counterweight 105 is used to offset the weight of the magnification rod 106, the tray 1027, etc. The end 105 of the magnification rod 106 close to the counterweight is hinged to the support seat 1010 so that it can rotate around the support seat 1010.

[0053] A force-applying component is installed at a set position between the hinged end of the amplifying rod 106 and one end connected to the tray 1027, for example, the force-applying component is installed at a middle position between the hinged end and the tray end. Of course, this position can be adjusted according to specific circumstances.

[0054] Specifically, the amplifying rod 106 is connected to the force-applying component through a vertical force transmission component, such as Figure 6 As shown, the vertical force transmission component includes a rod-end ball bearing 1022, a pressure plate 1023 and a pressure sensor 1024. The pressure plate 1023 is connected to the bottom of the rod-end ball bearing 1022, and the top of the rod-end ball bearing 1022 is connected to the amplifying rod 106. The connection method of the rod-end ball bearing 1022 can make the force applied to the force-adding bracket 1025 vertically downward; by adopting a lever amplifying device, a smaller weight can be used to obtain a multiplication of the applied force.

[0055] In this embodiment, the longitudinal section of the pressure plate 1023 is an inverted U-shaped structure. The pressure sensor 1024 is installed in the pressure plate 1023. The top of the pressure sensor 1024 is connected to the rod end ball bearing 1022, and the bottom is connected to the force component.

[0056] The force-adding assembly includes a force-adding bracket 1025 and a pressure bearing 1020. The force-adding bracket 1025 is arranged inside the pressure plate 1023. The pressure bearing 1020 is connected to the force-adding bracket 1025 through the mounting shaft 1026. The pressure bearing 1020 can directly contact the test shaft 1034, so that the test shaft 1034 is subjected to a constant force load during the reciprocating motion. The slide rail assemblies are symmetrically installed on both sides of the force-adding bracket 1025 to guide the longitudinal movement of the force-adding assembly.

[0057] The slide rail assembly includes a slide rail 1012 and a slider 108 slidably connected to the slide rail 1012 . The slider 108 is connected to a force-applying bracket 1025 . The slide rail 1012 is installed on the inner side of the support plate 107 .

[0058] This embodiment also includes a control part, which includes a main control box 4. The main control box 4 is connected to the driving mechanism, the torque sensor 102, the pressure sensor 1024, etc. through a control line. The main control box 4 is used to adjust different test conditions, collect sensor signals during the operation of the equipment, and display them in the form of charts.

[0059] The testing process of the life test equipment in this embodiment is as follows:

[0060] Step 1: Install the first tightening rod 1033, the radial tightening block 1028, the second tightening rod 1031, the inner ring fixture 1029, etc. on the test shaft 1034, and connect the test shaft 1034 to the driving mechanism;

[0061] Step 2: Install the outer side of the coated self-lubricating spherical plain bearing on the outer ring fixture 1018; fix the coated self-lubricating spherical plain bearing axially and the outer ring radially by rotating the compression nut 1030 and the bolt 1032. In addition, rotate the second tightening rod 1031 to fix the inner ring of the coated self-lubricating spherical plain bearing radially.

[0062] Step 4: Select a suitable weight 109 and place it on the tray 1027.

[0063] Step 5: Close the vacuum chamber 2, select the working condition through the control part, and observe the relevant sensing parameters.

[0064] Step 6: After the test is completed, shut down the equipment, remove the weight 109, and loosen the second tightening rod 1031, the clamping nut 1030, and the bolt 1032 to separate the test bearing from the test shaft 1034, and move the force bracket 1025 up along the guide rail 1012 to remove the test bearing.

[0065] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A spherical bearing life test device with axial and radial coordinated fixation, characterized in that: It includes a test shaft, one end of which is connected to a driving mechanism, a rotatable lever amplifying device is provided above the test shaft, and a force-applying component for applying pressure to the other end of the test shaft is provided below the lever amplifying device; An axial tightening assembly is installed on the outside of the test shaft, a tightening hole is opened in the axial direction inside the test shaft, a matching hole connected to the tightening hole is opened in the radial direction, and a radial tightening assembly is arranged in the tightening hole to radially tighten the test bearing on the test shaft through the matching hole; The tightening hole is a threaded hole, and the radial tightening assembly includes a first tightening rod and a second tightening rod arranged opposite to each other, and a radial tightening block corresponding to the matching hole is arranged between the first tightening rod and the second tightening rod; the corresponding ends of the first tightening rod and the second tightening rod are respectively provided with inclined end faces, and the radial tightening block has a side surface adapted to the end faces; the end of the second tightening rod extends out of the tightening hole; the matching holes are arranged in pairs, and the matching holes are fan-shaped holes; a groove for moving the radial tightening block is arranged on the inner side of the fan-shaped hole; The axial tightening assembly comprises an inner ring clamp and an outer ring clamp, and the outer ring clamp is connected to a temperature control device via a temperature control tube.

2. The axially and radially coordinated fixed spherical bearing life test equipment according to claim 1 is characterized in that: The force-adding assembly includes a force-adding bracket and a pressure bearing installed on the force-adding bracket; The force-adding bracket is connected with the lever amplifying device through a vertical force transmission component, and the slide rail components are symmetrically installed on both sides of the force-adding bracket so that the force-adding bracket moves vertically when the lever amplifying device rotates.

3. The axially and radially coordinated fixed spherical bearing life test equipment according to claim 2 is characterized in that: The vertical force transmission component comprises a rod end ball bearing and a pressure plate connected to the rod end ball bearing. A force bracket is installed in the pressure plate, and a pressure sensor is installed between the force bracket and the rod end ball bearing.

4. A spherical plain bearing life test device with axial and radial coordinated fixation according to claim 1 or 2, characterized in that: The lever magnifying device comprises a magnifying rod, one end of which is connected to a counterweight, and the other end of which is connected to a tray for placing weights; the magnifying rod is hinged to a supporting seat.

5. The axially and radially coordinated fixed spherical bearing life test equipment according to claim 1 is characterized in that: The driving mechanism comprises a power source and a transmission mechanism connected to the power source, wherein the transmission mechanism is arranged in the vacuum chamber.

6. The axially and radially coordinated fixed spherical bearing life test equipment according to claim 5 is characterized in that: The transmission mechanism comprises a torque sensor and a rotary joint which are connected in sequence. A temperature control shaft connected to the test shaft is installed in the rotary joint. The rotary joint is connected to a temperature control device via a temperature control tube.

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