Double-track ball bat fatigue test assembly and double-track ball bat fatigue testing machine comprising same

Abstract

The invention discloses a double-track ball bat fatigue test assembly and a double-track ball bat fatigue testing machine comprising the same, and relates to the technical field of ball bat fatigue tests. According to the invention, the problems of low single test efficiency, complicated installation and disassembly and incapability of accurately evaluating the axial load of the ball rod fatigue test of the existing ball rod type rolling contact fatigue testing machine are solved. A vertically-arranged linear sliding table is installed at the front end of a sliding table supporting frame, a motor is installed on a sliding table working plate of the linear sliding table, a main shaft of the motor is connected with the upper end of a bat test piece through a flexible coupler, and the lower end of the bat test piece sequentially penetrates through a test cabin cover, a thrust knuckle bearing, an upper-layer first loading ring and a second loading ring. The outer surface of the bat test piece is in contact with the upper and lower layers of test rolling bodies, and the power output end of the loading force mechanism abuts against the ball head pressure head. The device is used for testing the fatigue life of the bat, can simultaneously meet double tracks, accurately measures the input axial load, and simplifies the installation procedure.

Description

Technical Field

[0001] The present invention relates to the technical field of ball bat fatigue testing, and in particular to a device for testing the mechanical life of ball bats made of different materials under high-speed rotation and axial load conditions, and specifically to a dual-track ball bat fatigue testing assembly and a dual-track ball bat fatigue testing machine comprising the testing assembly. Background Art

[0002] In the modern aviation industry, aircraft engines are the power source and "heart" of aircraft, and are also the core key to whether aircraft can operate normally. The bearings of aircraft engines are the key factors that determine the life of aircraft engines. This places particularly high demands on the stability and reliability of bearing components. Compared with the main shaft bearing series of corresponding bearing steel materials used in foreign countries, the main shaft bearings commonly used in my country have the problem of lower life and reliability. Fatigue failure, as one of the main failure forms of bearings, seriously restricts the further improvement of bearing life.

[0003] Under laboratory conditions, by simulating the actual axial load of the bearing and eliminating many influencing factors, a reliable test method is provided for studying the fatigue failure behavior of bearing materials under real axial load conditions. This provides an efficient method for scientific researchers to more fully study the bearing fatigue failure mechanism, which is of great value to improving the bearing life.

[0004] The rolling contact fatigue life test of bearings is one of the important methods for evaluating the performance of bearing materials. It is a method that applies high-cycle contact loads to the material under test until the material is fatigue damaged. As the rolling contact material is repeatedly subjected to high contact stress, initial cracks will be generated at the maximum stress of the subsurface, and the cracks will extend to the surface, eventually causing fatigue spalling and bearing failure. At present, the testing machines used for bearing fatigue life tests are mainly ball-disc type, roller type and ball-and-stick type. The rolling contact of bearings can be divided into two contact modes: line contact and point contact. The ball-and-stick rolling contact fatigue testing machine is widely used because of its simple structure, high speed, and the closest to the actual working form of the bearing.

[0005] At present, the problems in the research of ball bat fatigue test mainly focus on single track, no coupling connection, and the inability to quantify the input force. This leads to low efficiency of single test of ball bat fatigue test, cumbersome installation and disassembly, and inability to accurately evaluate the axial load. Therefore, it is meaningful to develop an instrument that can meet dual tracks at the same time, accurately measure the input axial load, and simplify the installation procedure for testing the fatigue life of ball bats. Summary of the invention

[0006] The purpose of the present invention is to solve the problems of low single test efficiency of ball bat fatigue test, cumbersome installation and disassembly, and inability to accurately evaluate axial load in existing ball bat type rolling contact fatigue testing machines, and further to provide a dual-track ball bat fatigue testing assembly and a dual-track ball bat fatigue testing machine including the test assembly.

[0007] The technical solution of the present invention is:

[0008] A double-track ball bat fatigue test assembly, the test assembly comprises a test chamber and a ball bat test piece 100, the test chamber comprises a test base 101, a test chamber cover 102, a loading guide chamber 103, a spoke pressure sensor 104, a ball head pressure head 105, a thrust joint bearing 106, a second loading ring 107, a loading ring pad 108, two first loading rings 109 and six test rolling bodies 110, the test base 101 is a cylindrical structure, the test chamber cover 102 is installed on the upper end of the test base 101, the center of the upper surface of the test chamber cover 102 is processed with a test chamber cover through hole matching the ball bat test piece 100, the loading guide chamber 103, the spoke pressure sensor 104 and the ball head pressure head 105 are coaxially arranged in the test base 101 from top to bottom in a slidable manner, and the ball head pressure head 105 is arranged in a slidable manner in sequence. The upper end of the head 105 is connected to the center position of the lower end of the spoke-type pressure sensor 104. The loading guide cabin 103 is a cylindrical structure. The thrust spherical bearing 106, the second loading ring 107 and the loading ring pad 108 are coaxially arranged in sequence from top to bottom in the test cavity of the loading guide cabin 103. The two first loading rings 109 are respectively arranged between the thrust spherical bearing 106 and the second loading ring 107 and between the loading ring pad 108 and the second loading ring 107. Three test rolling bodies 110 are respectively arranged between the first loading ring 109 and the two adjacent second loading rings 107. The three test rolling bodies 110 are uniformly arranged around the ball and bat test piece 100 in the circumferential direction. The upper and lower ends of the inner hole surfaces of the second loading ring 107 and the two first loading rings 109 are processed into conical surfaces matching the test rolling bodies 110.

[0009] Furthermore, a test base loading force assembly port 1011 is provided at the lower side of the test base 101 of the test chamber body, and the test base loading force assembly port 1011 is a horizontally arranged rectangular countersunk hole, and the left and right side walls of the rectangular countersunk hole are respectively processed with two symmetrically arranged axial hole positions, and a vertically arranged test base oil inlet and return assembly port 1012 is provided at the upper side of the test base 101, and the upper part of the test base oil inlet and return assembly port 1012 passes through the upper surface of the test base 101, and the test base oil inlet and return assembly port 1012 and the test base loading force assembly port 1011 are respectively located on both sides of the test base 101.

[0010] Furthermore, the test chamber body also includes a first oil inlet 111, a second oil inlet 112 and an oil return port 113. The side of the loading guide chamber 103 is processed with a first oil inlet circuit, a second oil inlet circuit and an oil return circuit arranged radially from top to bottom. The first oil circuit and the second oil circuit are both connected to the inside of the loading guide chamber 103, and the first oil circuit and the second oil circuit correspond to the upper and lower layers of test rolling elements 110 respectively. An axially arranged oil return groove is processed at the center of the bottom of the loading guide chamber 103, and the third oil circuit is connected to the oil return groove. One end of the first oil inlet 111, the second oil inlet 112 and the oil return port 113 pass through the test base oil inlet and return assembly port 1012 of the test base 101, and are respectively spirally sealed and installed at the end of the first oil inlet circuit, the second oil inlet circuit and the oil return circuit.

[0011] A dual-track ball bat fatigue testing machine, the dual-track ball bat fatigue testing machine comprises the dual-track ball bat fatigue testing assembly 1 according to any one of claims 1 to 3, the dual-track ball bat fatigue testing machine also comprises a test bench 2, a slide support frame 3, a linear slide 4, a power system 5 and a loading force mechanism 6, the upper end of the test bench 2 is equipped with a slide support frame 3, the front end of the slide support frame 3 is equipped with a vertically arranged linear slide 4, the front of the linear slide 4 is provided with a power system 5, the power system 5 comprises an electric motor 501 and a flexible coupling 502, the electric motor 501 is installed on the linear slide On the slide work plate of table 4, the motor shaft 503 of the motor 501 is connected to the upper end of the ball-and-stick test piece 100 through the flexible coupling 502, and the lower end of the ball-and-stick test piece 100 passes through the test chamber cover 102, the thrust spherical bearing 106, the upper first loading ring 109 and the second loading ring 107 from bottom to top, and the outer surface of the ball-and-stick test piece 100 contacts the upper and lower test rolling bodies 110, and the loading force mechanism 6 is installed on the test bench 2, and the power output end of the loading force mechanism 6 passes through the test base loading force assembly port 1011 of the test base 101 and abuts against the ball head pressure head 105.

[0012] Furthermore, the loading force mechanism 6 of the dual-track ball bat fatigue testing machine includes a loading force traction assembly 600, a secondary pressure arm 601, a secondary pressure arm pin 602, a pressing ear 603, a pressing ear pin 604, a primary pressure arm 605, a primary pressure arm pin 606 and two primary pressure arm supports 607, the secondary pressure arm 601 is a rectangular rod-shaped structure, one end of the secondary pressure arm 601 is inserted into the test base loading force assembly port 1011 of the test base 101, the middle part of the secondary pressure arm 601 is rotatably connected to the two axial holes on the left and right sides of the hole wall of the test base loading force assembly port through the secondary pressure arm pin 602, the upper surface of one end of the secondary pressure arm 601 is against the ball head pressure head 105, and the upper surface of the other end of the secondary pressure arm 601 is processed with a V-shaped groove, and the primary pressure arm 605 includes a primary pressure arm straight rod end and a primary pressure arm annular rod section integrally formed with the end of the straight rod section, the primary pressure arm annular rod section is sleeved on the outside of the test base 101, the middle part of the primary pressure arm straight rod end is connected to the pressure ear 603 through the primary pressure arm pin 606, the lower end of the pressure ear 603 is processed into a V-shaped protrusion, and the V-shaped protrusion corresponds to the V-shaped groove of the secondary pressure arm 601, two primary pressure arm supports 607 are vertically symmetrically arranged on both sides of the end of the primary pressure arm straight rod end, the lower ends of the two primary pressure arm supports 607 are connected to the upper end of the test bench 2, the upper ends of the two primary pressure arm supports 607 are rotatably connected to the end of the primary pressure arm straight rod end through the primary pressure arm pin 606, and the end of the primary pressure arm annular rod section is connected to the loading force traction assembly 600.

[0013] Furthermore, the loading force traction assembly 600 of the dual-track ball bat fatigue testing machine includes a loading force traction line 608, a loading force screw rod 609, a loading force screw rod adjustment slider 610, a loading force handwheel frame 611, a loading force handwheel 612 and two loading force support rods 613, the loading force screw rod 609 is vertically arranged below the upper end plate of the test bench 2, the loading force handwheel frame 611 is horizontally arranged below the loading force screw rod 609, the loading force handwheel frame 611 is a rectangular block structure, the loading force handwheel frame 611 is connected to the support frame of the test bench 2, the lower end of the loading force screw rod 609 is rotatably connected to the middle part of the loading force handwheel frame 611, the loading force handwheel 612 is installed at the lower end of the loading force screw rod 609, and the loading force screw rod 6 09 is threadedly connected with a loading force bearing nut, and the loading force bearing nut is connected to the middle part of the loading force screw rod adjustment slider 610. Two loading force support rod mounting holes are respectively processed at both ends of the upper surface of the loading force screw rod adjustment slider 610. The two loading force support rods 613 are respectively vertically inserted into the two loading force support rod mounting holes. The lower end of the loading force support rod 613 is connected to the loading force handwheel frame 611, and the upper end of the loading force support rod 613 is connected to the upper end plate of the test bench 2. The upper end of the loading force traction line 608 is connected to the end of the first-level pressure arm annular rod segment. The upper end plate of the test bench 2 has a loading force traction line mounting hole, and the lower end of the loading force traction line 608 passes through the loading force traction line mounting hole and is connected to the loading force screw rod adjustment slider 610.

[0014] Furthermore, the slide support frame 3 of the dual-track ball bat fatigue testing machine includes a slide base plate 301, a slide cover plate 302, a slide working plate 303 and two slide stand plates 304. The slide cover plate 302 and the slide base plate 301 are horizontally arranged above the test bench 2 in sequence from top to bottom. The lower end of the slide base plate 301 is connected to the upper end of the test bench 2. Two slide stand plates 304 arranged vertically opposite to each other are arranged between the slide base plate 301 and the slide cover plate 302. The lower end of the slide stand plate 304 is connected to the upper end of the slide base plate 301, and the upper end of the slide stand plate 304 is connected to the lower end of the slide cover plate 302. The front ends of the two slide stand plates 304 are equipped with vertically arranged slide working plates 303.

[0015] Furthermore, the linear slide 4 of the dual-track bat fatigue testing machine includes a U-shaped slide frame 401, a slide handwheel 402, a slide connecting plate 403, a slide screw 404, two slide guide rails 405 and four slide blocks 406. The slide bottom plate of the U-shaped slide frame 401 is connected to the slide working plate 303. A vertically arranged slide screw 404 is provided in front of the slide bottom plate of the U-shaped slide frame 401. The upper and lower ends of the slide screw 404 are respectively connected to the slide top plate and the slide lower baffle of the U-shaped slide frame 401 for rotation. The slide handwheel 402 is installed on the upper end of the slide screw 404, and the slide bearing nut is installed on the slide screw 404. Two slide guide rails 405 arranged vertically and symmetrically are respectively arranged on both sides of the slide screw 404. The lower end of the slide guide rail 405 is connected to the slide base plate of the U-shaped slide frame 401. Two slide blocks 406 are slidably installed on each slide guide rail 405. The slide connecting plate 403 is vertically arranged in front of the U-shaped slide frame 401, and the rear end of the slide connecting plate 403 is connected to the four slide blocks 406.

[0016] Furthermore, the linear slide 4 of the dual-track ball bat fatigue testing machine also includes two upper stroke limit blocks 407 and two lower stroke limit blocks 408. Two symmetrically arranged upper stroke limit blocks 407 are provided on both sides of the upper end of the slide screw 404. The two upper stroke limit blocks 407 are installed on the front end surface of the slide bottom plate of the U-shaped slide frame 401. The lower end of the slide screw 404 is provided with two symmetrically arranged lower stroke limit blocks 408. The two lower stroke limit blocks 408 are installed on the front end surface of the slide bottom plate of the U-shaped slide frame 401.

[0017] Furthermore, the linear slide 4 of the dual-track ball bat fatigue testing machine also includes a displacement sensor assembly, which includes a displacement sensor 409, a stroke sensor baffle 410, a displacement sensor slider 411 and an inner sleeve of the displacement sensor slider. The center of the upper surface of the displacement sensor slider 411 is processed with an inner hole of the displacement sensor slider along the vertical direction. The inner sleeve of the displacement sensor slider is inserted into the inner hole of the displacement sensor slider. The inner sleeve of the displacement sensor slider is sleeved on the slide screw 404. A stroke sensor baffle 410 is installed on the side of the displacement sensor slider 411. The displacement sensor 409 is arranged on the side of the upper stroke limit block 407. The front surface of the displacement sensor 409 is provided with a slot that runs through the upper and lower surfaces of the displacement sensor 409 along the vertical direction, and the slot corresponds to the upper end of the stroke sensor baffle 410.

[0018] Compared with the prior art, the present invention has the following effects:

[0019] The dual-track ball bat fatigue testing machine described in the present invention improves the test efficiency of ball bat fatigue testing and develops a test method for studying the friction between the ball bat and the rolling ball. The use of a dual-track ball bat fatigue companion specimen as a connection can increase the number of friction pairs in a single test. The flexible coupling is used to connect the ball bat test piece to the motor main shaft to simplify installation. There is no need to perform shaft alignment during installation, which greatly improves the installation efficiency of a single test. It also ensures that there is no risk of unbalanced loading during the test, thereby affecting the test results. A thrust spherical bearing is used to unload the loading force applied to the test assembly to prevent the motor main shaft from being subjected to axial loads. At the same time, it can also adjust the partial posture of the entire test assembly to a horizontal level. Through the loading force mechanism, loading force arm and spoke pressure sensor, the fatigue effect of the friction pair composed of the rolling ball and the double-track ball bat fatigue specimen and the ball bat fatigue specimen on the ball bat under the action of different axial loads can be analyzed, and the fatigue of the ball bat can be evaluated at the friction track formed at the end, providing guidance for solving this form of fatigue in the future. At the same time, the installation of the slide and the displacement sensor can make it possible to conduct multiple groups of tests with different axial loads on the same ball bat without disassembling the test device, thereby improving the test efficiency.

[0020] The present invention also has the following advantages:

[0021] Dual-track advantages: improved test efficiency, enhanced stability of the test rod, and better ensured coaxiality between the center of the circle formed by the rolling element in the test chamber and the axis of the test rod.

[0022] Advantages of flexible couplings: No need to perform centering operations during installation, which simplifies the test installation process; when the test device is running, the stability of operation can be guaranteed.

[0023] Advantages of thrust spherical plain bearings: Ensure that the planes surrounded by the rolling elements in the cabin are horizontal, that is, the planes where each layer of rolling elements is located can be automatically adjusted to a horizontal level during installation.

[0024] The advantage of pressure sensor in end force measurement is that it can accurately measure the axial load on the test component. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a front view of the dual-track bat fatigue testing machine of the present invention;

[0026] Figure 2 is a top view of the dual-track ball bat fatigue testing machine of the present invention;

[0027] Figure 3 is a bottom view of the dual-track ball bat fatigue testing machine of the present invention;

[0028] Figure 4is a rear view of the dual-track bat fatigue testing machine of the present invention;

[0029] Figure 5 It is a left side view of the dual track ball bat fatigue testing machine of the present invention;

[0030] Figure 6 It is a right side view of the dual track ball bat fatigue testing machine of the present invention;

[0031] Figure 7 is an axonometric view of the dual-track bat fatigue testing machine of the present invention;

[0032] Figure 8 is a cross-sectional view of the dual-track bat fatigue testing machine of the present invention;

[0033] Fig. 9 It is a front view of the test chamber body and the loading force mechanism after the loading force traction assembly is removed in the dual-track ball bat fatigue testing machine of the present invention after being assembled;

[0034] Fig.10 It is an axonometric diagram of the test chamber in the dual-track ball bat fatigue testing machine of the present invention after the test chamber and the loading force mechanism after the loading force traction assembly is removed are assembled;

[0035] Fig.11 It is a side view of the test chamber body and the loading force mechanism after the loading force traction assembly is removed in the dual-track ball bat fatigue testing machine of the present invention after being assembled;

[0036] Fig.12 yes Fig.11 Sectional view at AA;

[0037] Fig.13 It is an axonometric diagram of the test chamber of the present invention after removing the test base and the test chamber cover;

[0038] Fig.14 It is a structural diagram of the test chamber of the present invention after removing the test base and the test chamber cover;

[0039] Fig.15 is an axonometric view of the test base of the present invention;

[0040] Fig.16 is a structural diagram of the test base of the present invention;

[0041] Fig.17 It is an enlarged cross-sectional view of the shaft system in the dual-track ball bat fatigue testing machine of the present invention;

[0042] Fig.18 is a top view of the axis system of the dual-track ball bat fatigue testing machine of the present invention;

[0043] Fig.19It is the force diagram of the shafting system in the double-track bat fatigue testing machine described in the present invention;

[0044] Fig. 20 It is the effect diagram of two tests on the same bat (where, Fig. 20 (a) is the track position of the first group of tests, Fig. 20 (b) is the track position of the second group of tests, and the "red line segment" is the track trace of the first group of tests, and the "green line segment" is the track trace of the second group of tests).

[0045] In the figure: 1. Double-track bat fatigue test component; 100. Bat test piece; 101. Test base; 1011. Loading force assembly port of the test base; 1012. Oil inlet and return port of the test base; 102. Test cabin cover; 103. Loading guide cabin; 104. Spoke-type pressure sensor; 105. Ball head indenter; 106. Thrust joint bearing; 107. Second loading ring; 108. Loading ring gasket; 109. First loading ring; 110. Test rolling body; 111. First oil inlet; 112. Second oil inlet; 113. Oil return port; 2. Test bench; 3. Slide support frame; 301. Slide frame bottom plate; 302. Slide frame cover plate; 303. Slide working plate; 304. Slide frame vertical plate; 4. Linear slide; 401. U-shaped slide frame; 402. Slide handwheel; 403. Slide connecting plate; 404. Slide lead screw; 405. Slide guide rail; 406. Slide slider; 407. Upper stroke limit block; 408. Lower stroke limit block; 409. Displacement sensor; 410. Stroke sensor stop piece; 411. Displacement sensor slider; 5. Power system; 501. Motor; 502. Flexible coupling; 503. Motor main shaft; 6. Loading force mechanism; 600. Loading force traction component; 601. Secondary pressure arm; 602. Secondary pressure arm pin shaft; 603. Pressure ear; 604. Pressure ear pin shaft; 605. Primary pressure arm; 606. Primary pressure arm pin shaft; 607. Primary pressure arm support; 608. Loading force traction line; 609. Loading force lead screw; 610. Loading force lead screw adjustment slider; 611. Loading force handwheel frame; 612. Loading force handwheel; 613. Loading force support rod. Detailed implementation manners

[0046] Detailed implementation manner one: In combination with Figures 9 to 20The present embodiment is described. A dual-track ball bat fatigue test assembly of the present embodiment comprises a test chamber and a ball bat test piece 100. The test chamber comprises a test base 101, a test chamber cover 102, a loading guide chamber 103, a spoke pressure sensor 104, a ball head pressure head 105, a thrust spherical bearing 106, a second loading ring 107, a loading ring pad 108, two first loading rings 109 and six test rolling bodies 110. The test base 101 is a cylindrical structure. The test chamber cover 102 is installed on the upper end of the test base 101. The center of the upper surface of the test chamber cover 102 is processed with a test chamber cover through hole matching the ball bat test piece 100. The loading guide chamber 103, the spoke pressure sensor 104 and the ball head pressure head 105 are coaxially arranged on the test base 101 in a slidable manner from top to bottom. 1, the upper end of the ball head pressure head 105 is connected to the center position of the lower end of the spoke type pressure sensor 104, the loading guide cabin 103 is a cylindrical structure, the thrust joint bearing 106, the second loading ring 107 and the loading ring pad 108 are coaxially arranged in the test cavity of the loading guide cabin 103 from top to bottom, the two first loading rings 109 are respectively arranged between the thrust joint bearing 106 and the second loading ring 107 and between the loading ring pad 108 and the second loading ring 107, three test rolling bodies 110 are respectively arranged between the first loading ring 109 and the two adjacent second loading rings 107, the three test rolling bodies 110 are uniformly arranged around the ball-bar test piece 100 in the circumferential direction, and the upper and lower ends of the inner hole surfaces of the second loading ring 107 and the two first loading rings 109 are processed into conical surfaces matching the test rolling bodies 110. With such a configuration, the loading guide cabin 103 and the spoke-type pressure sensor 104 are connected by screws, and the entire test friction pair is wrapped to ensure the safety of the test. At the same time, the axial vertical upward pressure transmitted by the pressure sensor is also received, and this pressure is transmitted to the test rolling element 110 and the first loading ring 109 and the second loading ring 107 to form a loading force. The existence of the second loading ring 107 enables two ball bat fatigue tests to be performed in one test. In addition, because the ball bat test piece 100 and the double-track ball bat fatigue companion test piece, the ball bat fatigue companion test piece and the loading guide cabin 103 are matched with a small clearance, the use of the thrust spherical bearing 106 can not only avoid the situation where the loading force directly acts on the motor main shaft, but also ensure that the entire test piece and the companion test piece group can ensure a horizontal posture when the test cavity cover is horizontal, ensuring the stability of the test bench operation.

[0047] The spoke pressure sensor 104 can be a spoke pressure sensor with mature technology on the market, which can accurately measure the axial load to meet the test requirements. This loading force system has good stability, simple construction, mature technology, and can adjust the axial load through simple operations.

[0048] Specific implementation method 2: Combination Figure 15 to Figure 16To explain this embodiment, a test base loading force assembly port 1011 is provided at the lower side of the test base 101 of the test chamber body of this embodiment. The test base loading force assembly port 1011 is a horizontally arranged rectangular countersunk hole, and two symmetrically arranged shaft holes are processed on the left and right side walls of the rectangular countersunk hole, respectively. A vertically arranged test base oil inlet and return assembly port 1012 is provided at the upper side of the test base 101. The upper part of the test base oil inlet and return assembly port 1012 passes through the upper surface of the test base 101. The test base oil inlet and return assembly port 1012 and the test base loading force assembly port 1011 are respectively located on both sides of the test base 101. Other components and connection relationships are the same as those of the first specific embodiment.

[0049] Specific implementation method three: Combination Figures 13 to 16 To illustrate the present embodiment, the test chamber body of the present embodiment further includes a first oil inlet 111, a second oil inlet 112 and an oil return port 113, and the side surface of the loading guide chamber 103 is processed with a first oil inlet circuit, a second oil inlet circuit and an oil return circuit arranged in a radial direction from top to bottom, the first oil circuit and the second oil circuit are both connected to the interior of the loading guide chamber 103, and the first oil circuit and the second oil circuit correspond one by one to the upper and lower layers of test rolling elements 110 respectively, and an axially arranged oil return groove is processed at the center position of the bottom of the loading guide chamber 103, the third oil circuit is connected to the oil return groove, and one end of the first oil inlet 111, the second oil inlet 112 and the oil return port 113 pass through the test base oil inlet and return assembly port 1012 of the test base 101, and are respectively spirally sealed and installed at the end of the first oil inlet circuit, the second oil inlet circuit and the oil return circuit. In this configuration, a common pneumatic valve on the market is selected as the oil inlet and return port, which is connected to the test cavity through a thread, and can be connected to an external oil pipeline through the clamping device of the pneumatic valve. Lubricating oil is transported to the first oil inlet 111 and the second oil inlet 112 through the outside world, so as to achieve the purpose of lubricating the friction pair composed of the rolling ball body and the rolling ball body and the double-track ball and bat fatigue test piece and the ball and bat fatigue test piece, and the friction pair composed of the rolling ball body and the ball and bat. The oil return port 113 is used to remove excess lubricating oil and waste oil from the test cavity to avoid affecting the test. Other components and connection relationships are the same as those of the first or second specific implementation method.

[0050] Specific implementation method four: Combination Figures 1 to 16The present embodiment is described. The present embodiment is a dual-track ball bat fatigue testing machine, the dual-track ball bat fatigue testing machine comprises the dual-track ball bat fatigue testing assembly 1 according to any one of claims 1 to 3, the dual-track ball bat fatigue testing machine also comprises a test bench 2, a slide support frame 3, a linear slide 4, a power system 5 and a loading force mechanism 6, the slide support frame 3 is installed at the upper end of the test bench 2, a vertically arranged linear slide 4 is installed at the front end of the slide support frame 3, a power system 5 is arranged in front of the linear slide 4, the power system 5 comprises an electric motor 501 and a flexible coupling 502, the electric motor 50 1 is installed on the slide work plate of the linear slide 4, the motor main shaft 503 of the motor 501 is connected to the upper end of the ball bat test piece 100 through the flexible coupling 502, the lower end of the ball bat test piece 100 passes through the test chamber cover 102, the thrust joint bearing 106, the upper first loading ring 109 and the second loading ring 107 from bottom to top, and the outer surface of the ball bat test piece 100 contacts the upper and lower test rolling bodies 110, the loading force mechanism 6 is installed on the test bench 2, and the power output end of the loading force mechanism 6 passes through the test base loading force assembly port 1011 of the test base 101 and abuts against the ball head pressure head 105. In this way, the motor main shaft 503 is connected to the ball bat test piece 100 through the flexible coupling 502, which provides power to it and ensures that the test ball bat does not have an unbalanced load during operation to affect the test results. Specifically, the flexible coupling 502 is used to connect the ball-stick test piece 100 with the motor main shaft 503, so that the test chamber does not need to adjust the ball-stick test piece 100 to be concentric with the motor main shaft 503 during installation, which simplifies the test operation. Moreover, when the motor 501 is running at high speed, the connection method of the flexible coupling 502 makes the entire test chamber more stable during the test, and does not cause partial load failure in the entire test chamber, thereby affecting the test effect. In order to enable the friction pair to meet the needs of different precise axial loads, a loading force mechanism and a pressure sensor are added to the test device. A pressure sensor is fixed under the test chamber to accurately measure the size of the axial load. In order to make each test simpler to operate, that is, to avoid the operation of the axis, a bellows coupling is used to connect the motor main shaft and the ball-stick test piece. Other types of flexible couplings can also be used to connect the motor main shaft and the ball-stick test piece. During the test, a vertical upward static pressure is applied to the two friction pairs through the loading force mechanism and the loading force arm, so that the two friction pairs are subjected to an axial loading force. Axial loads of different sizes can be achieved by adjusting the loading force mechanism. After receiving the abnormal vibration signal, the test is marked to be over. After the test, the motion trajectory formed by the friction between the rolling ball on the ball stick and the test ball stick can be observed to obtain the effect of ball stick material fatigue. For multiple ball stick fatigue tests under the same loading force, the life of the ball stick under this axial load can be summarized and analyzed. The other components and connection relationships are the same as those of the first, second or third specific implementations.

[0051] Among them, power system 5 is a customized high-speed electric spindle. This electric spindle is a mature product and has been used in many test systems. It can meet the use requirements under the conditions of axial load and high-speed rotation, and can run for a long time with stable state and high reliability. The ball bat test piece is a customized piece with a very mature customization process and has been used in many ball bat fatigue test systems.

[0052] Specific implementation method five: Combination Figure 1 , Figure 2 , Figure 3 , Figure 8 and Fig.10The present embodiment is described. The loading force mechanism 6 of the dual-track ball bat fatigue testing machine of the present embodiment includes a loading force traction assembly 600, a secondary pressure arm 601, a secondary pressure arm pin 602, a pressing ear 603, a pressing ear pin 604, a primary pressure arm 605, a primary pressure arm pin 606 and two primary pressure arm supports 607. The secondary pressure arm 601 is a rectangular rod-shaped structure. One end of the secondary pressure arm 601 is inserted into the test base loading force assembly port 1011 of the test base 101. The middle part of the secondary pressure arm 601 is rotatably connected to two axial holes on the left and right sides of the hole wall of the test base loading force assembly port through the secondary pressure arm pin 602. The upper surface of one end of the secondary pressure arm 601 is against the ball head pressure head 105. The upper surface of the other end of the secondary pressure arm 601 is processed with a V-shaped groove. The primary pressure arm 605 includes a primary pressure arm straight rod end and a primary pressure arm annular rod section integrally formed with the end of the straight rod section. The primary pressure arm annular rod section is sleeved on the outside of the test base 101. The middle of the primary pressure arm straight rod end is connected to the pressure ear 603 through the primary pressure arm pin 606. The lower end of the pressure ear 603 is processed into a V-shaped protrusion, which corresponds to the V-shaped groove of the secondary pressure arm 601. Two primary pressure arm supports 607 are vertically symmetrically arranged on both sides of the primary pressure arm straight rod end. The lower ends of the two primary pressure arm supports 607 are connected to the upper end of the test bench 2. The upper ends of the two primary pressure arm supports 607 are rotatably connected to the end of the primary pressure arm straight rod end through the primary pressure arm pin 606. The end of the primary pressure arm annular rod section is connected to the loading force traction assembly 600. In this way, in order to enable the test friction pair to meet different axial loads, an adjustable loading force system is added to the test machine. Specifically, the loading force traction assembly 600 is connected to the test chamber by using the primary and secondary pressure arm assemblies. At the same time, the secondary pressure arm 601 and the primary pressure arm 605 need to be kept horizontal during installation, so that the spoke pressure sensor 104 can accurately measure the vertical axial load. The flexible coupling 502 is respectively connected to the motor main shaft 503 and the ball bat test piece 100, which greatly reduces the difficulty of the installation operation and ensures that there will be no unbalanced load problems during the test operation. At the same time, the design of a multi-track ball bat fatigue test machine can also be realized by using the cooperation of multiple dual-track ball bat fatigue test pieces and ball bat fatigue test pieces. Other components and connection relationships are the same as those of specific embodiments one, two, three or four.

[0053] Specific implementation method six: Combination Figure 8Describe this embodiment. The loading force traction assembly 600 of the dual-track ball bat fatigue testing machine of this embodiment includes a loading force traction line 608, a loading force screw rod 609, a loading force screw rod adjustment slider 610, a loading force handwheel frame 611, a loading force handwheel 612 and two loading force support rods 613. The loading force screw rod 609 is vertically arranged below the upper end plate of the test bench 2, and the loading force handwheel frame 611 is horizontally arranged below the loading force screw rod 609. The loading force handwheel frame 611 is a rectangular block structure. The loading force handwheel frame 611 is connected to the support frame of the test bench 2. The lower end of the loading force screw rod 609 is rotatably connected to the middle part of the loading force handwheel frame 611. The loading force handwheel 612 is installed at the lower end of the loading force screw rod 609. A loading force bearing nut is threadedly connected to the force screw rod 609, and the loading force bearing nut is connected to the middle part of the loading force screw rod adjustment slider 610. Two loading force support rod mounting holes are respectively processed at both ends of the upper surface of the loading force screw rod adjustment slider 610. Two loading force support rods 613 are respectively vertically inserted into the two loading force support rod mounting holes. The lower end of the loading force support rod 613 is connected to the loading force handwheel frame 611, and the upper end of the loading force support rod 613 is connected to the upper end plate of the test bench 2. The upper end of the loading force traction line 608 is connected to the end of the first-level pressure arm annular rod segment. The upper end plate of the test bench 2 has a loading force traction line mounting hole, and the lower end of the loading force traction line 608 passes through the loading force traction line mounting hole and is connected to the loading force screw rod adjustment slider 610. With such a configuration, there is a loading force screw rod 609 below the test bench 2, and the loading force screw rod can be adjusted by the loading force hand wheel 612 to adjust the rising height of the slider 610, thereby giving a downward pulling force to the loading force traction line 608, and the loading force traction line 608 simultaneously transmits a downward pulling force to the primary pressure arm 605, and the primary pressure arm 605 can change the direction of the downward pulling force, and the loading force can achieve axial vertical loading while ensuring that the secondary pressure arm 601 is horizontal. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four or five.

[0054] Specific implementation method seven: Combination Figure 7 This embodiment is described. The slide support frame 3 of the double track ball bat fatigue tester of this embodiment includes a slide base plate 301, a slide cover plate 302, a slide work plate 303 and two slide stand plates 304. The slide cover plate 302 and the slide base plate 301 are horizontally arranged above the test bench 2 from top to bottom. The lower end of the slide base plate 301 is connected to the upper end of the test bench 2. Two slide stand plates 304 arranged vertically opposite to each other are arranged between the slide base plate 301 and the slide cover plate 302. The lower end of the slide stand plate 304 is connected to the upper end of the slide base plate 301, and the upper end of the slide stand plate 304 is connected to the lower end of the slide cover plate 302. The front ends of the two slide stand plates 304 are installed with vertically arranged slide work plates 303. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five or six.

[0055] Specific implementation method eight: Combination Figure 7 The present embodiment is described. The linear slide 4 of the dual-track ball bat fatigue testing machine of the present embodiment includes a U-shaped slide frame 401, a slide handwheel 402, a slide connecting plate 403, a slide screw 404, two slide guide rails 405 and four slide blocks 406. The slide bottom plate of the U-shaped slide frame 401 is connected to the slide working plate 303. A vertically arranged slide screw 404 is provided in front of the slide bottom plate of the U-shaped slide frame 401. The upper and lower ends of the slide screw 404 are respectively connected to the slide top plate and the slide bottom plate of the U-shaped slide frame 401. The baffle is rotatably connected, a slide handwheel 402 is installed on the upper end of the slide screw 404, a slide bearing nut is installed on the slide screw 404, two slide rails 405 arranged vertically and symmetrically are respectively arranged on both sides of the slide screw 404, the lower end of the slide rail 405 is connected to the slide bottom plate of the U-shaped slide frame 401, and two slide blocks 406 are slidably installed on each slide rail 405, and the slide connecting plate 403 is vertically arranged in front of the U-shaped slide frame 401, and the rear end of the slide connecting plate 403 is connected to the four slide blocks 406. With such a configuration, the linear slide 4 is installed above the test bench 2, and the use of the linear slide 4 to fix the motor 501 can conveniently adjust the height of the motor 501. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six or seven.

[0056] Among them, the linear slide 4 is a high-load slide. This slide is a mature product and has been applied to multiple test systems, including assessments of working conditions such as axial loads and high-speed rotation. It can meet the use requirements and operate for a long time with stable status and high reliability.

[0057] Specific implementation method nine: Combination Figure 7 To explain this embodiment, the linear slide 4 of the dual-track ball bat fatigue testing machine of this embodiment further includes two upper travel limit blocks 407 and two lower travel limit blocks 408. Two upper travel limit blocks 407 are symmetrically arranged on both sides of the upper end of the slide screw 404. The two upper travel limit blocks 407 are mounted on the front end surface of the slide bottom plate of the U-shaped slide frame 401. Two lower travel limit blocks 408 are symmetrically arranged on the lower end of the slide screw 404. The two lower travel limit blocks 408 are mounted on the front end surface of the slide bottom plate of the U-shaped slide frame 401. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six, seven or eight.

[0058] Specific implementation method ten: Combination Figure 8To explain this embodiment, the linear slide 4 of the dual-track ball bat fatigue testing machine of this embodiment also includes a displacement sensor assembly, which includes a displacement sensor 409, a travel sensor baffle 410, a displacement sensor slider 411 and a displacement sensor slider inner sleeve. The center of the upper surface of the displacement sensor slider 411 is processed with a displacement sensor slider inner hole in the vertical direction, the displacement sensor slider inner sleeve is inserted in the displacement sensor slider inner hole, the displacement sensor slider inner sleeve is sleeved on the slide screw 404, and a travel sensor baffle 410 is installed on the side of the displacement sensor slider 411. The displacement sensor 409 is set on the side of the upper travel limit block 407, and the front surface of the displacement sensor 409 is provided with a slot that runs through the upper and lower surfaces of the displacement sensor 409 in the vertical direction, and the slot corresponds to the upper end of the travel sensor baffle 410. In this way, the displacement sensor 409 is used to quantify the travel of the linear slide 4, which is convenient for controlling the track interval between different groups. The other components and connection relationships are the same as those of the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth embodiment.

[0059] The displacement sensor 409 is a common displacement sensor on the market with an accuracy higher than the millimeter level. The displacement sensor is an immature product and is also used in many systems on the market.

[0060] When the secondary pressure arm 601 applies a static vertical upward force to the ball head pressure head 105 in the dual-track ball bat fatigue test assembly 1, the spoke pressure sensor 104 can accurately measure the magnitude of the force applied in the vertical direction. Since the upper test chamber cover 102 and the test base 101 are fixed by screws, the loading force can be unloaded through the thrust spherical bearing 106, so that there is no vertical upward axial load on the motor spindle 503 or the flexible coupling 502. The ball bat fatigue test piece and the dual-track ball bat fatigue test piece are clearance-fitted with the test cavity, so the thrust spherical bearing 106 can adjust the posture of the entire test chamber part to achieve a horizontal posture.

[0061] The core part of the double track bat fatigue test assembly is an axis system consisting of a bat test piece 100, a first loading ring 109, a second loading ring 107 and a test rolling element 110. During the test, the three test rolling elements 110 of the upper or lower layer can be arranged around the bat test piece 100 at intervals of 120°. The axis system during the test is as follows: Fig.17 and Fig.18 shown.

[0062] like Fig.19 As shown, F 载荷 is the axial loading force applied by the test assembly to the first loading ring 109, F1 and F2 are F 载荷 The force acting on the test rolling element 110, F合 is the combined force of F1 and F2, and is also the radial contact stress of the ball-bat test piece 100. The dual-track ball-bat fatigue tester mainly improves the test efficiency by performing two sets of tests with the same stress conditions at one time. The special shaft system structure of the shaft system in the dual-track ball-bat fatigue tester and the flexible coupling 502 used to connect the ball-bat test piece 100 with the motor main shaft 503 ensure that the axial load of the entire shaft system will not be unbalanced during the test. During the test, in order to ensure that the stress conditions of the dual-track test are the same, that is, to ensure that the upper and lower layers of the test rolling elements 110 are subjected to the same stress, it is necessary to ensure that the α angle of the upper first loading ring 109 and the β angle of the lower first loading ring 109 are consistent, and thus the radial contact stress of the ball-bat test piece 100 can be calculated by the following formula.

[0063] F1=F 载荷 sinβ

[0064] F2=F 载荷 sinα

[0065] F 合 =F1cosβ+F2cosα=F 载荷 sinβcosβ+F 载荷 sinαcosα

[0066] How it works

[0067] Combination Figures 1 to 16 The working principle of the dual-track ball bat fatigue testing machine described in the present invention is described as follows: it is driven by the motor spindle 503, the spoke-type pressure sensor 104 detects the size of the axial load, the thrust spherical bearing 106 allows the entire ball bat test piece 100 to self-adjust to a horizontal posture, and the displacement sensor 409 allows the ball bat test piece 100 to reach the designated test area. It can also accurately adjust the spacing between the tracks, thereby achieving a dual-track fatigue test on a ball bat in a single test, and multiple groups of tests can be performed on a ball bat test piece without disassembling the test equipment, only by adjusting the slide stroke. After completing a group of fatigue tests, the slide can be used to adjust the position of the ball bat test piece 100 until the spacing between the two tracks interferes with each other, and the test can be repeated on the same ball bat. Fig. 20 shown.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-track bat fatigue test assembly, characterized in that: The test assembly comprises a test chamber and a ball-and-stick test piece (100); the test chamber comprises a test base (101), a test chamber cover (102), a loading guide chamber (103), a spoke-type pressure sensor (104), a ball head pressure head (105), a thrust joint bearing (106), a second loading ring (107), a loading ring gasket (108), two first loading rings (109) and six test rolling bodies (110); the test base (101) is a cylindrical structure; the test chamber cover (102) is mounted on the upper end of the test base (101); a test chamber cover through hole matching the ball-and-stick test piece (100) is machined at the center of the upper surface of the test chamber cover (102); the loading guide chamber (103), the spoke-type pressure sensor (104) and the ball head pressure head (105) are coaxially arranged in sequence from top to bottom in the test base (101) in a slidable manner; the ball head pressure head (105) is provided with a plurality of rollers. The end is connected to the center position of the lower end of the spoke-type pressure sensor (104); the loading guide cabin (103) is a cylindrical structure; the thrust joint bearing (106), the second loading ring (107) and the loading ring pad (108) are coaxially arranged in sequence from top to bottom in the test cavity of the loading guide cabin (103); the two first loading rings (109) are respectively arranged between the thrust joint bearing (106) and the second loading ring (107) and between the loading ring pad (108) and the second loading ring (107); three test rolling bodies (110) are respectively arranged between the first loading ring (109) and two adjacent second loading rings (107); the three test rolling bodies (110) are uniformly arranged around the ball-stick test piece (100) in the circumferential direction; the upper and lower ends of the inner hole surfaces of the second loading ring (107) and the two first loading rings (109) are processed into conical surfaces matching the test rolling bodies (110).

2. The dual track bat fatigue test assembly according to claim 1, characterized in that: A test base loading force assembly port (1011) is provided at the lower part of the side of the test base (101) of the test chamber body. The test base loading force assembly port (1011) is a horizontally arranged rectangular countersunk hole. The hole walls on the left and right sides of the rectangular countersunk hole are respectively processed with two symmetrically arranged axial holes. A vertically arranged test base oil inlet and return assembly port (1012) is provided at the upper part of the side of the test base (101). The upper part of the test base oil inlet and return assembly port (1012) penetrates the upper surface of the test base (101). The test base oil inlet and return assembly port (1012) and the test base loading force assembly port (1011) are respectively located on both sides of the test base (101).

3. The dual track bat fatigue test assembly according to claim 2, characterized in that: The test chamber body further comprises a first oil inlet (111), a second oil inlet (112) and an oil return port (113); a first oil inlet passage, a second oil inlet passage and an oil return passage are processed from top to bottom on the side of the loading guide chamber (103) in a radially arranged manner; the first oil passage and the second oil passage are both connected to the interior of the loading guide chamber (103), and the first oil passage and the second oil passage correspond to the upper and lower layers of test rolling bodies (110) respectively; an oil return groove is processed in an axially arranged manner at the center of the bottom of the loading guide chamber (103); the third oil passage is connected to the oil return groove; one end of the first oil inlet (111), the second oil inlet (112) and the oil return port (113) pass through the test base oil inlet and return assembly port (1012) of the test base (101) and are respectively spirally sealed and installed at the ends of the first oil inlet passage, the second oil inlet passage and the oil return passage.

4. A dual-track ball bat fatigue testing machine, characterized in that: The dual-track ball bat fatigue testing machine comprises the dual-track ball bat fatigue testing assembly (1) according to any one of claims 1 to 3, and the dual-track ball bat fatigue testing machine also comprises a test bench (2), a slide support frame (3), a linear slide (4), a power system (5) and a loading force mechanism (6), wherein the upper end of the test bench (2) is equipped with a slide support frame (3), a vertically arranged linear slide (4) is installed at the front end of the slide support frame (3), a power system (5) is provided in front of the linear slide (4), and the power system (5) comprises an electric motor (501) and a flexible coupling (502), and the electric motor (501) is installed at the slide working portion of the linear slide (4). The motor main shaft (503) of the motor (501) is connected to the upper end of the ball-and-stick test piece (100) through a flexible coupling (502); the lower end of the ball-and-stick test piece (100) passes through the test chamber cover (102), the thrust joint bearing (106), the upper first loading ring (109) and the second loading ring (107) in sequence from bottom to top, and the outer surface of the ball-and-stick test piece (100) contacts the upper and lower test rolling bodies (110); the loading force mechanism (6) is installed on the test bench (2); the power output end of the loading force mechanism (6) passes through the test base loading force assembly port (1011) of the test base (101) and abuts against the ball head pressure head (105).

5. The dual-track ball bat fatigue testing machine according to claim 4, characterized in that: The loading force mechanism (6) of the dual-track ball-stick fatigue testing machine comprises a loading force traction assembly (600), a secondary pressure arm (601), a secondary pressure arm pin (602), a pressure ear (603), a pressure ear pin (604), a primary pressure arm (605), a primary pressure arm pin (606) and two primary pressure arm supports (607). The secondary pressure arm (601) is a rectangular rod-shaped structure. One end of the secondary pressure arm (601) is inserted into a test base loading force assembly port (1011) of a test base (101). The middle part of the secondary pressure arm (601) is rotatably connected to two axial holes on the left and right side hole walls of the test base loading force assembly port through the secondary pressure arm pin (602). The upper surface of one end of the secondary pressure arm (601) abuts against the ball head pressure head (105). The upper surface of the other end of the secondary pressure arm (601) is processed with a V-shaped groove. The first-stage pressure arm (605) comprises a first-stage pressure arm straight rod end and a first-stage pressure arm annular rod section integrally formed with the end of the straight rod section, the first-stage pressure arm annular rod section is sleeved on the outside of the test base (101), the middle part of the first-stage pressure arm straight rod end is connected to the pressure ear (603) through the first-stage pressure arm pin shaft (606), the lower end of the pressure ear (603) is processed into a V-shaped protrusion, and the V-shaped protrusion corresponds to the V-shaped groove of the second-stage pressure arm (601), two first-stage pressure arm supports (607) are vertically symmetrically arranged on both sides of the first-stage pressure arm straight rod end, the lower ends of the two first-stage pressure arm supports (607) are connected to the upper end of the test bench (2), the upper ends of the two first-stage pressure arm supports (607) are rotatably connected to the end of the first-stage pressure arm straight rod end through the first-stage pressure arm pin shaft (606), and the end of the first-stage pressure arm annular rod section is connected to the loading force traction assembly (600).

6. The dual-track ball bat fatigue testing machine according to claim 5, characterized in that: The loading force traction assembly (600) of the dual-track ball-stick fatigue testing machine comprises a loading force traction line (608), a loading force screw rod (609), a loading force screw rod adjustment slider (610), a loading force handwheel frame (611), a loading force handwheel (612) and two loading force support rods (613), wherein the loading force screw rod (609) is vertically arranged below the upper end plate of the test bench (2), the loading force handwheel frame (611) is horizontally arranged below the loading force screw rod (609), the loading force handwheel frame (611) is a rectangular block structure, the loading force handwheel frame (611) is connected to the support frame of the test bench (2), the lower end of the loading force screw rod (609) is rotatably connected to the middle part of the loading force handwheel frame (611), the loading force handwheel (612) is installed at the lower end of the loading force screw rod (609), and the loading force A loading force bearing nut is threadedly connected to the screw rod (609), and the loading force bearing nut is connected to the middle part of the loading force screw rod adjustment slider (610). Two loading force support rod mounting holes are respectively processed at both ends of the upper surface of the loading force screw rod adjustment slider (610). Two loading force support rods (613) are respectively vertically inserted into the two loading force support rod mounting holes. The lower end of the loading force support rod (613) is connected to the loading force handwheel frame (611), and the upper end of the loading force support rod (613) is connected to the upper end plate of the test bench (2). The upper end of the loading force traction line (608) is connected to the end of the primary pressure arm annular rod segment. The upper end plate of the test bench (2) has a loading force traction line mounting hole, and the lower end of the loading force traction line (608) passes through the loading force traction line mounting hole and is connected to the loading force screw rod adjustment slider (610).

7. The dual-track ball bat fatigue testing machine according to claim 4, characterized in that: The slide support frame (3) of the double track ball stick fatigue testing machine comprises a slide base plate (301), a slide cover plate (302), a slide working plate (303) and two slide stand plates (304); the slide cover plate (302) and the slide base plate (301) are horizontally arranged above the test bench (2) in order from top to bottom; the lower end of the slide base plate (301) is connected to the upper end of the test bench (2); two slide stand plates (304) arranged vertically opposite to each other are arranged between the slide base plate (301) and the slide cover plate (302); the lower end of the slide stand plate (304) is connected to the upper end of the slide base plate (301); the upper end of the slide stand plate (304) is connected to the lower end of the slide cover plate (302); and the front ends of the two slide stand plates (304) are provided with vertically arranged slide working plates (303).

8. The dual-track ball bat fatigue testing machine according to claim 6 or 7, characterized in that: The linear slide (4) of the double-track ball bat fatigue testing machine comprises a U-shaped slide frame (401), a slide hand wheel (402), a slide connecting plate (403), a slide screw (404), two slide guide rails (405) and four slide blocks (406). The slide bottom plate of the U-shaped slide frame (401) is connected to the slide working plate (303). A vertically arranged slide screw (404) is provided in front of the slide bottom plate of the U-shaped slide frame (401). The upper and lower ends of the slide screw (404) are respectively rotatably connected to the slide top plate and the slide bottom baffle of the U-shaped slide frame (401). A slide hand wheel (402) is installed at the upper end of the slide screw (404), a slide bearing nut is installed on the slide screw (404), two slide rails (405) arranged vertically and symmetrically are respectively arranged on both sides of the slide screw (404), the lower end of the slide rail (405) is connected to the slide bottom plate of the U-shaped slide frame (401), and two slide sliders (406) are slidably installed on each slide rail (405), the slide connecting plate (403) is vertically arranged in front of the U-shaped slide frame (401), and the rear end of the slide connecting plate (403) is connected to the four slide sliders (406).

9. The dual-track ball bat fatigue testing machine according to claim 8, characterized in that: The linear slide (4) of the dual-track ball bat fatigue testing machine also includes two upper travel limit blocks (407) and two lower travel limit blocks (408); two upper travel limit blocks (407) are symmetrically arranged on both sides of the upper end of the slide screw (404); the two upper travel limit blocks (407) are mounted on the front end surface of the slide bottom plate of the U-shaped slide frame (401); two lower travel limit blocks (408) are symmetrically arranged on the lower end of the slide screw (404); the two lower travel limit blocks (408) are mounted on the front end surface of the slide bottom plate of the U-shaped slide frame (401).

10. The dual-track ball bat fatigue testing machine according to claim 9, characterized in that: The linear slide (4) of the dual-track ball bat fatigue testing machine also includes a displacement sensor assembly, which includes a displacement sensor (409), a travel sensor baffle (410), a displacement sensor slider (411) and a displacement sensor slider inner sleeve. The center of the upper surface of the displacement sensor slider (411) is processed with a displacement sensor slider inner hole in the vertical direction. The displacement sensor slider inner sleeve is inserted into the displacement sensor slider inner hole. The displacement sensor slider inner sleeve is sleeved on the slide screw (404). The side of the displacement sensor slider (411) is installed with a travel sensor baffle (410). The displacement sensor (409) is arranged on the side of the upper travel limit block (407). The front surface of the displacement sensor (409) is provided with a slot that runs through the upper and lower surfaces of the displacement sensor (409) in the vertical direction. The slot corresponds to the upper end of the travel sensor baffle (410).

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