Knuckle bearing axial clearance measuring tool

Abstract

The utility model discloses a tool for measuring the axial clearance of a knuckle bearing, and relates to the technical field of knuckle bearings. The device comprises a positioning tool, a clamping tool and a measurement control device, wherein the measurement control device comprises a pull pressure sensor and a displacement measuring instrument; the positioning tool comprises a test bench lower plate, a test bench upper plate, a lower bottom support rod, an upper bottom support rod, an adapter rod conversion device and a test bench positioning plate. The clamping tool comprises a test piece pressing plate, an ejector rod and a screw rod; the test piece pressing plate is detachably mounted on the test bed positioning plate, and a mounting groove is formed in the middle of the test piece pressing plate; a displacement measuring instrument is fixed on the test bed positioning plate, and a detection head of the displacement measuring instrument is lapped on the screw rod; the test piece is located in the mounting groove, and the inner ring of the test piece is pressed in the mounting groove by tightening the screw. According to the utility model, the knuckle bearing does not need to be disassembled, in-situ measurement can be carried out, the maintenance cost is effectively reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of spherical bearings, and more specifically to a spherical bearing axial clearance measuring tool. Background Art

[0002] Spherical bearings have the characteristics of simple and compact structure, high load-bearing capacity, and strong impact resistance. They are often used in the actuators of aircraft flight control systems. Spherical bearings have a special structure, mainly consisting of an inner ring with an outer spherical surface and an outer ring with an inner spherical surface. The inner ring can rotate freely 360 degrees. The wear-resistant layer of the bearing is constantly worn during long-term use, resulting in a continuous increase in the gap between the inner and outer rings. When the gap increases to a certain extent, it will directly affect the safety performance, operating life and safety reliability of the aircraft. Therefore, during the service life cycle, the clearance of the spherical bearing needs to be measured regularly. The method for measuring the bearing clearance is to fix the inner and outer rings of the spherical bearing, apply the same force to the inner ring in two opposite directions along the axial direction, and measure the displacement of the inner ring, which is the spherical bearing clearance.

[0003] At present, the axial clearance measurement technology of spherical plain bearings requires removing the spherical plain bearings from the support and placing them on a bearing measuring instrument for testing. However, since the two end faces of the spherical plain bearings are closed during the actual assembly process, the disassembly process requires the destruction of the bearing bushing, which must then be press-fitted again using special equipment, increasing maintenance costs and labor intensity.

[0004] Among the existing patents, "A Rod End Joint Bearing Clearance Measuring Device" (application number: 202310749506.1) can effectively fix the outer ring of the rod end bearing and measure the radial clearance of the bearing, but this device cannot adapt to and fix rods of different diameters, and cannot measure the axial clearance of the bearing, and has low applicability; the clearance measuring device of "Method for Rapidly Detecting Joint Bearing Clearance" (application number: 201711193394.7) is relatively complex, and requires external force to apply the load, and the stability of the load cannot be guaranteed during the measurement process; "A Joint Bearing Spherical Surface Measurement Method" (application number: 202211518538.2) has extremely high requirements on the operator's proficiency, and does not solve the problem of needing to disassemble the bearing for measurement.

[0005] Therefore, it is necessary to develop a spherical bearing axial clearance measuring tool that can measure the axial clearance without disassembling the spherical bearing, ensure the accurate clearance value of the spherical bearing under a set load, and measure the axial clearance of spherical bearings of different models. Summary of the invention

[0006] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and to provide a joint bearing axial clearance measuring tool.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a joint bearing axial clearance measurement tool, characterized in that it includes a positioning tool, a clamping tool and a measurement control device, and the measurement control device includes a tension and pressure sensor and a displacement measuring instrument;

[0008] The positioning fixture includes a lower plate of the test bench, an upper plate of the test bench, a lower bottom support rod, an upper bottom support rod, a transfer rod conversion device and a test bench positioning plate; the lower end of the lower bottom support rod passes through the lower plate of the test bench and is threadedly connected to the lower plate of the test bench, and the upper end is connected to the transfer rod conversion device; the lower end of the upper bottom support rod is connected to the transfer rod conversion device, and the upper end is connected to the tension and pressure sensor; the test bench positioning plate is fixed on the upper plate of the test bench;

[0009] The clamping fixture comprises a test piece pressure plate, a push rod and a screw rod; the test piece pressure plate is detachably mounted on the test bench positioning plate, and a mounting groove is provided in the middle of the test piece pressure plate; the lower end of the push rod is connected to the tension and pressure sensor, and the upper end passes through the test piece pressure plate and is located in the mounting groove and is threadedly connected to the screw rod;

[0010] The displacement measuring instrument is fixed on the positioning plate of the test bench, and the detection head of the displacement measuring instrument is placed on the screw rod;

[0011] The test piece is located in the installation groove, and the screw is tightened so that the inner ring of the test piece is pressed into the installation groove.

[0012] In the above technical solution, two thrust bearings are symmetrically placed in the chamber of the transfer rod conversion device, and the two thrust bearings are respectively connected to the lower bottom support rod and the upper bottom support rod to convert the rotational lifting and lowering motion of the lower bottom support rod into vertical lifting motion.

[0013] In the above technical solution, the clamping fixture also includes a pressure strip, which is installed on the test piece pressure plate to press the test piece into the installation groove.

[0014] In the above technical solution, the pressure strip includes a left pressure strip and a right pressure strip, and the left pressure strip and the right pressure strip are both threadedly connected to the test piece pressure plate, and the screw is located between the left pressure strip and the right pressure strip.

[0015] In the above technical solution, the lower end of the lower support rod is connected to the hand crank.

[0016] Compared with the prior art, the utility model has the following advantages.

[0017] 1) The utility model does not need to disassemble the spherical bearing and can perform in-situ measurement, which effectively reduces maintenance costs and improves work efficiency.

[0018] 2) When measuring spherical bearings of different models, the utility model only needs to design and replace the clamping fixtures of corresponding sizes, thereby improving adaptability.

[0019] 3) The utility model realizes synchronization of load recording and displacement recording during the measurement process, has strong load loading operability, can further accurately control the load during the measurement process, and ensures the accuracy of the data.

[0020] 4) The outer ring clamping fixture of the joint bearing in the utility model can fit reliably, and can ensure that the joint bearing is not crushed during the measurement process, and the result is effective.

[0021] 5) The utility model relies on high-precision tension and pressure sensors and precise displacement sensors, which can effectively avoid situations such as damage to the test piece due to excessive load or inaccurate actual measurement values ​​due to too small load.

[0022] 6) The utility model utilizes the transfer rod conversion device in the positioning tooling to realize the conversion of rotary ascent into linear ascent motion, and has a simple structure and ingenious design. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the utility model.

[0024] Figure 2 It is the front view of the utility model.

[0025] Figure 3 It is a top view of the utility model.

[0026] Figure 4 Isometric drawing of the utility model.

[0027] Figure 5 It is a schematic diagram of the structure of the clamping tooling.

[0028] Figure 6 for Figure 5 Cross-sectional view at AA in the middle.

[0029] Figure 7 It is a structural schematic diagram of the transfer rod conversion device.

[0030] Figure 8 It is the front view of the transfer rod conversion device.

[0031] Fig. 9 for Figure 8 Cross-sectional view at BB in the middle.

[0032] Among them, 1-positioning fixture, 11-lower plate of test bench, 12-upper plate of test bench, 13-lower bottom support rod, 14-upper bottom support rod, 15-adapter rod conversion device, 151-thrust bearing, 16-test bench positioning plate, 17-hand crank, 2-clamping fixture, 21-test piece pressure plate, 211-installation groove, 22-top rod, 23-screw, 24-pressure strip, 241-left pressure strip, 242-right pressure strip, 3-measurement control device, 31-tension and pressure sensor, 32-displacement measuring instrument, 4-test piece. DETAILED DESCRIPTION

[0033] The following is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model and are only used as examples. At the same time, the advantages of the utility model will become clearer and easier to understand through the description.

[0034] Referring to the attached drawings, it can be seen that: a joint bearing axial clearance measuring tool comprises a positioning tool 1, a clamping tool 2 and a measuring control device 3, wherein the measuring control device 3 comprises a tension and pressure sensor 31 and a displacement measuring instrument 32;

[0035] The positioning fixture 1 includes a test bench lower plate 11, a test bench upper plate 12, a lower bottom support rod 13, an upper bottom support rod 14, a transfer rod conversion device 15 and a test bench positioning plate 16; the lower end of the lower bottom support rod 13 passes through the test bench lower plate 11 and is threadedly connected to the test bench lower plate 11, and the upper end is connected to the transfer rod conversion device 15; the lower end of the upper bottom support rod 14 is connected to the transfer rod conversion device 15, and the upper end is connected to the tension and pressure sensor 31; the test bench positioning plate 16 is fixed on the test bench upper plate 12;

[0036] The clamping fixture 2 includes a test piece pressing plate 21, a push rod 22 and a screw 23; the test piece pressing plate 21 is detachably mounted on the test bench positioning plate 16, and a mounting groove 211 is opened in the middle of the test piece pressing plate 21; the lower end of the push rod 22 is connected to the tension and pressure sensor 31, and the upper end passes through the test piece pressing plate 21 and is located in the mounting groove 211 and is threadedly connected to the screw 23; the upper end of the push rod 22 has a hole and passes through the test piece pressing plate 21, and the screw 23 is threadedly connected to the upper end hole of the push rod 22;

[0037] The displacement measuring instrument 32 is fixed on the test bench positioning plate 16, and the detection head of the displacement measuring instrument 32 is placed on the screw rod 23;

[0038] The test piece 4 is located in the installation groove 211 , and the screw 23 is tightened so that the inner ring of the test piece 4 is pressed into the installation groove 211 .

[0039] Two thrust bearings 151 are symmetrically placed in the chamber of the transfer rod conversion device 15. The two thrust bearings 151 are respectively connected to the lower bottom support rod 13 and the upper bottom support rod 14, and the rotational lifting and lowering movement of the lower bottom support rod 13 is converted into a vertical lifting movement, thereby ensuring that the tension and pressure sensor 31 only moves in the vertical direction during the measurement process and does not rotate.

[0040] The clamping fixture 2 further includes a pressure strip 24 , which is installed on the test piece pressing plate 21 to press the test piece 4 into the installation groove 211 .

[0041] The pressure strip 24 includes a left pressure strip 241 and a right pressure strip 242, and the left pressure strip 241 and the right pressure strip 242 are both threadedly connected to the test piece pressure plate 21, and the screw 23 is located between the left pressure strip 241 and the right pressure strip 242; the left pressure strip 241 and the right pressure strip 242 press the test piece 4, further ensuring that the lower end surface of the screw 23 is close to the inner ring of the joint bearing.

[0042] The lower end of the lower support rod 13 is connected to the hand crank 17 .

[0043] In actual use, the test piece 4 is a spherical bearing, and in-situ measurement means that the spherical bearing is not removed from the product during measurement. The lower plate 11 of the test bench is a circular flat plate with a threaded hole in the center; the upper plate 12 of the test bench and the positioning plate 16 of the test bench are both circular rings; the positioning plate 16 of the test bench has connection holes of different sizes to adapt to test piece pressure plates 21 of different sizes.

[0044] The use of the utility model comprises the following steps:

[0045] Step 1: Connect the hand crank 17 to the lower bottom support rod 13, connect the transfer rod conversion device 15 to the lower bottom support rod 13, connect one end of the tension pressure sensor 31 to the upper bottom support rod 14, and connect the other end to the top rod 22;

[0046] Step 2: Place the test piece 4 in the installation groove 211 of the test piece pressing plate 21, screw on the nuts of the left pressing strip 241 and the right pressing strip 242, and tighten the screw 23 to ensure that the test piece 4 is pressed tightly in the installation groove 211;

[0047] Step 3: Rotate the hand crank 17 and observe the displayed value of the tension pressure sensor 31 at the same time. When the displayed value is slightly greater than 0, stop rotating the hand crank 17;

[0048] Step 4: By rotating the hand crank 17 in the forward and reverse directions, tension and pressure can be applied to the test piece 4 to be measured. First, rotate the hand crank 17 clockwise to apply pressure to the test piece 4. While rotating the hand crank 17, observe the value of the tension and pressure sensor 31. When the specified value is reached, stop rotating the hand crank 17. At this time, place the detection head of the displacement measuring instrument 32 on the screw 23, adjust the pointer of the displacement measuring instrument 32 to zero, and then rotate the hand crank 17 counterclockwise to apply tension to the test piece 4. While rotating the hand crank 17, observe the reading of the tension and pressure sensor 31 until the reading reaches the specified value and stop. At this time, the reading of the displacement measuring instrument 32 is the axial clearance of the test piece 4, and the measurement is completed. After the measurement is completed, disassemble the relevant equipment and the test piece 4.

[0049] When measuring different types of spherical bearings, it is only necessary to design and replace the clamping fixture 2 of the corresponding size, which improves the adaptability;

[0050] Other parts not described belong to the prior art.

Claims

1. A tool for measuring axial clearance of a spherical plain bearing, characterized by: It comprises a positioning tool (1), a clamping tool (2) and a measurement control device (3), wherein the measurement control device (3) comprises a tension and pressure sensor (31) and a displacement measuring instrument (32); The positioning tool (1) comprises a test bench lower plate (11), a test bench upper plate (12), a lower bottom support rod (13), an upper bottom support rod (14), a transfer rod conversion device (15) and a test bench positioning plate (16); the lower end of the lower bottom support rod (13) passes through the test bench lower plate (11) and is threadedly connected to the test bench lower plate (11), and the upper end is connected to the transfer rod conversion device (15); the lower end of the upper bottom support rod (14) is connected to the transfer rod conversion device (15), and the upper end is connected to the tension and pressure sensor (31); the test bench positioning plate (16) is fixed on the test bench upper plate (12); The clamping fixture (2) comprises a test piece pressure plate (21), a push rod (22) and a screw (23); the test piece pressure plate (21) is detachably mounted on a test bench positioning plate (16), and a mounting groove (211) is provided in the middle of the test piece pressure plate (21); the lower end of the push rod (22) is connected to a tension and pressure sensor (31), and the upper end passes through the test piece pressure plate (21), is located in the mounting groove (211), and is then threadedly connected to the screw (23); The displacement measuring instrument (32) is fixed on the test bench positioning plate (16), and the detection head of the displacement measuring instrument (32) is placed on the screw rod (23); The test piece (4) is located in the installation groove (211), and the screw rod (23) is tightened so that the inner ring of the test piece (4) is pressed into the installation groove (211).

2. The axial clearance measuring tool for spherical plain bearing according to claim 1, characterized in that: Two thrust bearings (151) are symmetrically placed in the chamber of the transfer rod conversion device (15). The two thrust bearings (151) are respectively connected to the lower support rod (13) and the upper support rod (14) to convert the rotational lifting and lowering motion of the lower support rod (13) into vertical lifting and lowering motion.

3. The axial clearance measuring tool for spherical plain bearing according to claim 1 is characterized by: The clamping tool (2) also includes a pressure strip (24), which is installed on the test piece pressure plate (21) to press the test piece (4) into the installation groove (211).

4. The axial clearance measuring tool for spherical plain bearing according to claim 3 is characterized by: The pressure strip (24) comprises a left pressure strip (241) and a right pressure strip (242), and the left pressure strip (241) and the right pressure strip (242) are both threadedly connected to the test piece pressure plate (21), and the screw rod (23) is located between the left pressure strip (241) and the right pressure strip (242).

5. The axial clearance measuring tool for spherical plain bearing according to claim 1 is characterized by: The lower end of the lower support rod (13) is connected to the hand crank (17).

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