Dual-track bat fatigue test assembly and dual-track bat fatigue testing machine including the test assembly

Abstract

A dual-track ball bat fatigue test assembly and a dual-track ball bat fatigue testing machine including the test assembly, which relate to the technical field of ball bat fatigue testing. The present invention solves the problems of low efficiency of single test of ball bat fatigue test, cumbersome installation and disassembly, and inability to accurately evaluate axial load in existing ball bat rolling contact fatigue testing machines. A vertically arranged linear slide is installed at the front end of the slide support frame of the present invention, and the motor is installed on the slide working plate of the linear slide. The motor main shaft is connected to the upper end of the ball bat test piece through a flexible coupling, and the lower end of the ball bat test piece passes through the test cabin cover, the thrust spherical bearing, the upper first loading ring and the second loading ring in sequence. The outer surface of the ball bat test piece contacts the upper and lower test rolling bodies, and the power output end of the loading force mechanism is offset against the ball head pressure head. The present invention is used to test the fatigue life of a ball bat, and can simultaneously meet the requirements of dual tracks, accurately measure the input axial load, and simplify 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 including the test assembly. Background Art

[0002] In the modern aviation industry, aircraft engines are the power source and "heart" of aircraft, crucial to their proper operation. Aircraft engine bearings are a key factor in determining their lifespan. This places particularly stringent demands on the stability and reliability of bearing components. Compared to comparable bearing steels used internationally, currently commonly used aircraft engine main shaft bearings in my country suffer from lower lifespan and reliability. Fatigue failure, a primary mode of bearing failure, severely restricts further improvements in bearing lifespan.

[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 working conditions with axial loads. This provides an efficient method for scientific researchers to more fully study the fatigue failure mechanism of bearings, which is of great value to improving the life of bearings.

[0004] The rolling contact fatigue life test for bearings is an important method for evaluating the performance of bearing materials. It involves applying high-cycle contact loads to the material under test until fatigue damage occurs. Due to the repeated high contact stresses on the rolling contact material, initial cracks develop at the point of maximum stress on the subsurface. These cracks then propagate to the surface, eventually causing fatigue spalling and bearing failure. Currently, the testing machines used for bearing fatigue life testing primarily include ball-on-disc, roller, and ball-and-stick types. Bearing rolling contact can be categorized into two types: line contact and point contact. Ball-and-stick rolling contact fatigue testing machines are widely used due to their simple structure, high speed, and proximity to the actual working conditions of bearings.

[0005] At present, the problems in the research of ball-and-bat fatigue testing mainly focus on the single track, no coupling connection, and the inability to quantify the input force. This leads to low efficiency of single-test of ball-and-bat fatigue testing, cumbersome installation and disassembly, and inability to accurately evaluate the axial load. Therefore, it is meaningful to develop an instrument that can simultaneously meet dual tracks, accurately measure the input axial load, and simplify the installation procedure for testing the fatigue life of ball-and-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 rolling contact fatigue testing machines, and 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 dual-track ball bat fatigue test assembly, the test assembly includes a test chamber and a ball bat test piece 100, the test chamber includes 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 pad 108, two first loading rings 109 and six test rolling elements 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-type pressure sensor 104 and the ball head pressure head 105 are slidably coaxially arranged in sequence from top to bottom inside the test base 101, and the ball head pressure head 105 is arranged coaxially inside the test base 101. The upper end of the head 105 is connected to the center of the lower end of the spoke-type pressure sensor 104. The loading guide cabin 103 has 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 within the test cavity of the loading guide cabin 103. Two first loading rings 109 are respectively disposed 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 elements 110 are respectively disposed between the first loading ring 109 and the two adjacent second loading rings 107. The three test rolling elements 110 are evenly arranged around the ball and bat test piece 100 in the circumferential direction. The inner bore surfaces of the second loading ring 107 and the two first loading rings 109 are machined with tapered surfaces at both ends to match the test rolling elements 110.

[0009] Furthermore, a test base loading force assembly port 1011 is provided on the lower 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 left and right side walls of the rectangular countersunk hole are respectively processed with two symmetrically arranged axial hole positions. A vertically arranged test base oil inlet and return assembly port 1012 is provided on 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.

[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 oil circuit, a second oil inlet oil circuit and an oil return oil circuit arranged radially 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-to-one to the upper and lower layers of test rolling elements 110 respectively. An axially arranged oil return groove is processed at the center position 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 101's test base oil inlet and return assembly port 1012 and are respectively spirally sealed and installed at the end of the first oil inlet oil circuit, the second oil inlet oil circuit and the oil return oil circuit.

[0011] A dual-track ball bat fatigue testing machine, the dual-track ball bat fatigue testing machine includes 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 includes 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 includes 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 platform 4, the motor shaft 503 of the motor 501 is connected to the upper end of the ball-and-stick test piece 100 via a flexible coupling 502. 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 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 elements 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 indenter 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 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 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. 605 includes a first-level pressure arm straight rod end and a first-level pressure arm annular rod section integrally formed with the end of the straight rod section. The first-level pressure arm annular rod section is sleeved on the outside of the test base 101. The middle part of the first-level pressure arm straight rod end is connected to the pressure ear 603 through the first-level 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 second-level pressure arm 601. Two first-level pressure arm supports 607 are vertically symmetrically arranged on both sides of the first-level pressure arm straight rod end. The lower ends of the two first-level pressure arm supports 607 are connected to the upper end of the test bench 2. The upper ends of the two first-level pressure arm supports 607 are rotatably connected to the end of the first-level pressure arm straight rod end through the first-level pressure arm pin 606. The end of the first-level 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, 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. 09 is threadedly connected with a loading force bearing nut, which is connected to the middle part of the loading force screw 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 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 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 upright 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 upright plates 304 are vertically arranged opposite to each other between the slide base plate 301 and the slide cover plate 302. The lower end of the slide upright plate 304 is connected to the upper end of the slide base plate 301, and the upper end of the slide upright plate 304 is connected to the lower end of the slide cover plate 302. The front ends of the two slide upright plates 304 are equipped with vertically arranged slide working plates 303.

[0015] Furthermore, the linear slide 4 of the dual-track ball 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 base 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 base 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 upper end of the slide screw 404 is equipped with a slide handwheel 402, and the slide bearing nut is installed on the slide screw 404. Two slide guide rails 405 arranged vertically and symmetrically are respectively provided 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 upper stroke limit blocks 407 are symmetrically arranged 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 base plate of the U-shaped slide frame 401. The lower end of the slide screw 404 is provided with two lower stroke limit blocks 408 which are symmetrically arranged. The two lower stroke limit blocks 408 are installed on the front end surface of the slide base 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 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 along 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. 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 tests and develops a test method for studying the friction between the ball bat and the rolling ball. Using a dual-track ball bat fatigue test piece as a connection can increase the number of friction pairs in a single test. A 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. It also enables the entire test assembly to be partially adjusted to a horizontal position. Through the loading force mechanism, loading force arm and spoke-type pressure sensor, the fatigue effect of the friction pair composed of the rolling ball and the dual-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 final friction track, providing guidance for solving this form of fatigue in the future. At the same time, the installation of the slide and displacement sensor allows multiple groups of tests with different axial loads to be performed 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] Advantages of dual tracks: improved test efficiency, enhanced stability of the test rod, and better ensured coaxiality between the center of the circle formed by the rolling elements in the test chamber and the axis of the test rod.

[0022] Advantages of flexible couplings: No need for centering 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 the pressure sensor at the end force measurement is that it can accurately measure the axial load on the test component. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0033] Figure 9 This is a front view of the dual-track ball bat fatigue testing machine of the present invention after the test chamber and the loading force mechanism with the loading force traction assembly removed are assembled;

[0034] Figure 10 This is an axonometric diagram of the test chamber 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;

[0035] Figure 11 It is a side view of the test chamber 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;

[0036] Figure 12 yes Figure 11 Cross-sectional view at AA;

[0037] Figure 13 This is an axonometric view of the test chamber of the present invention with the test base and the test chamber cover removed;

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

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

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

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

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

[0043] Figure 19This is a schematic diagram of the force on the shaft system of the dual-track ball bat fatigue testing machine of the present invention;

[0044] Figure 20 This is a diagram showing the effect of two tests on the same bat of the present invention (wherein, Figure 20 (a) is the position of the first set of test trajectories, Figure 20 (b) is the position of the first group of experimental trajectories, the “red line segment” is the trace of the first group of experimental trajectories, and the “green line segment” is the trace of the second group of experimental trajectories).

[0045] Figure: 1. Dual-track ball-and-stick fatigue test assembly; 100. Ball-and-stick test piece; 101. Test base; 1011. Test base loading force assembly port; 1012. Test base oil inlet and return assembly port; 102. Test chamber cover; 103. Loading guide chamber; 104. Spoke pressure sensor; 105. Ball head pressure head; 106. Thrust spherical bearing; 107. Second loading ring; 108. Loading ring gasket ; 109, first loading ring; 110, test rolling element; 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 connection Plate; 404, slide screw; 405, slide guide rail; 406, slide block; 407, upper stroke limit block; 408, lower stroke limit block; 409, displacement sensor; 410, stroke sensor baffle; 411, displacement sensor slider; 5, power system; 501, motor; 502, flexible coupling; 503, motor spindle; 6, loading force mechanism; 600, loading force traction assembly; 601, secondary pressure arm; 602, secondary pressure arm pin; 603, pressure ear; 604, pressure ear pin; 605, primary pressure arm; 606, primary pressure arm pin; 607, primary pressure arm support; 608, loading force traction line; 609, loading force screw; 610, loading force screw adjustment slider; 611, loading force handwheel frame; 612, loading force handwheel; 613, loading force support rod. DETAILED DESCRIPTION

[0046] Specific implementation method 1: Combination Figures 9 to 20The present embodiment is described. A dual-track ball bat fatigue test assembly of the present embodiment includes a test chamber and a ball bat test piece 100. The test chamber includes a test base 101, a test chamber cover 102, a loading guide chamber 103, a spoke pressure sensor 104, a ball head indenter 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 elements 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 that matches the ball bat test piece 100. The loading guide chamber 103, the spoke pressure sensor 104 and the ball head indenter 105 are slidably arranged coaxially on the test base 101 from top to bottom. Inside, the upper end of the ball head pressure head 105 is connected to the center 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 within the test cavity of the loading guide cabin 103. 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 elements 110 are respectively provided between the first loading ring 109 and the two adjacent second loading rings 107. The three test rolling elements 110 are evenly arranged around the ball-stick test piece 100 in the circumferential direction. The upper and lower ends of the inner bore surfaces of the second loading ring 107 and the two first loading rings 109 are machined into tapered surfaces that match the test rolling elements 110. With this arrangement, the loading guide cabin 103 and spoke-type pressure sensor 104 are connected by screws, completely enclosing the test friction pair, ensuring test safety. The cabin also receives axial vertical upward pressure from the pressure sensor and transmits this pressure to the test rolling element 110, the first loading ring 109, and the second loading ring 107, forming a loading force. The presence of the second loading ring 107 enables two ball bat fatigue tests to be performed in one test. Furthermore, because the ball bat test specimen 100, the dual-track ball bat fatigue co-test specimen, and the ball bat fatigue co-test specimen are fitted with a small clearance against the loading guide cabin 103, the use of the thrust spherical bearing 106 not only prevents the loading force from directly acting on the motor spindle, but also ensures that the entire test specimen and co-test specimen assembly maintain a horizontal position when the test chamber cover is horizontal, thus ensuring the stability of the test bench operation.

[0047] The spoke-type pressure sensor 104 can be a commercially available, mature spoke-type pressure sensor, accurately measuring the axial load to meet test requirements. This loading system has good stability, is simple to set up, and uses mature technology, allowing the axial load to be adjusted through simple operations.

[0048] Specific implementation method 2: Combination Figures 15 and 16To describe this embodiment, a test base loading force assembly port 1011 is provided on the lower 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, and two symmetrically arranged axial holes are machined on the left and right side walls of the rectangular countersunk hole. A vertically arranged test base oil inlet and return assembly port 1012 is provided on the upper side of the test base 101. The upper portion 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 in the first specific embodiment.

[0049] Specific implementation method three: Combination Figures 13 to 16 To illustrate this embodiment, the test chamber body of this embodiment 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 oil circuit, a second oil inlet oil circuit and an oil return oil circuit arranged radially 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-to-one to the upper and lower layers of test rolling elements 110 respectively. An axially arranged oil return groove is processed at the center position 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 101's test base inlet and return oil assembly port 1012 and are respectively spirally sealed and installed at the end of the first oil inlet oil circuit, the second oil inlet oil circuit and the oil return oil circuit. This setup utilizes a common pneumatic valve as the oil inlet and return port, threadedly connected to the test chamber. The pneumatic valve's built-in clamping device allows connection to an external oil pipeline. Lubricating oil is delivered from the outside to the first and second oil inlets 111 and 112, achieving the purpose of lubricating the friction pairs consisting of the rolling ball and the dual-track ball-and-stick fatigue test piece, the ball-and-stick fatigue test piece, and the rolling ball and ball-and-stick fatigue test piece. Oil return port 113 removes excess lubricating oil and waste oil from the test chamber to prevent it from affecting the test. Other components and connections are identical to those in Specific Embodiments 1 or 2.

[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, which includes 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 includes 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 on the upper end of the test bench 2, and 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. The power system 5 includes an electric motor 501 and a flexible coupling 502. The electric motor 50 1 is mounted on the slide work plate of the linear slide 4. The motor shaft 503 of the motor 501 is connected to the upper end of the ball-bat test specimen 100 via a flexible coupling 502. The lower end of the ball-bat test specimen 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. The outer surface of the ball-bat test specimen 100 contacts the upper and lower test rolling elements 110. The loading mechanism 6 is mounted on the test bench 2. The power output end of the loading mechanism 6 passes through the test base loading force assembly port 1011 of the test base 101 and abuts against the ball head indenter 105. This arrangement connects the motor shaft 503 to the ball-bat test specimen 100 via the flexible coupling 502, providing power to it while also ensuring that the test ball-bat does not experience unbalanced loading during operation, which could affect the test results. Specifically, a flexible coupling 502 is used to connect the ball-and-stick test piece 100 to the motor shaft 503. This eliminates the need to adjust the ball-and-stick test piece 100 to be concentric with the motor shaft 503 during installation, simplifying the test procedure. Furthermore, when the motor 501 is running at high speed, the flexible coupling 502 provides greater stability during the test, preventing partial unbalanced loading of the entire test chamber, which could affect the test results. To ensure that the friction pair can meet the requirements of varying precision axial loads, a loading mechanism and a pressure sensor are added to the test apparatus. A pressure sensor is mounted below the test chamber to accurately measure the magnitude of the axial load. To simplify each test, eliminating the need for shaft alignment, a bellows coupling is used to connect the motor shaft and the ball-and-stick test piece. Other types of flexible couplings can also be used to connect the motor shaft and the ball-and-stick test piece. During the test, a loading mechanism and loading arm exert a vertical upward static pressure on the two friction pairs, subjecting them to an axial loading force. Adjusting the loading mechanism allows for varying axial loads. Receiving an abnormal vibration signal signals the end of the test. After the test, the motion trajectory formed by the friction between the rolling ball and the test bat can be observed to determine the fatigue effects of the bat material. Multiple fatigue tests under the same loading force can be used to analyze the bat's lifespan under this axial load. Other components and connections are identical to those in Specific Embodiments 1, 2, or 3.

[0051] Power System 5 is a customized high-speed electric spindle. This mature product has been used in multiple test systems, meeting operational requirements under conditions such as axial loads and high-speed rotation. It also operates stably and reliably over extended periods of time. The ball bat test piece is a custom-made component, manufactured using a sophisticated process, and has been used in multiple ball bat fatigue test systems.

[0052] Specific implementation method five: Combination Figure 1 、 Figure 2 、 Figure 3 、 Figure 8 and Figure 10Describing this embodiment, the loading force mechanism 6 of the dual-track ball bat fatigue testing machine of this embodiment includes 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 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 side 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 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. The primary pressure arm 605 comprises 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 onto the exterior of the test base 101. The middle portion of the primary pressure arm straight rod end is connected to the pressure ear 603 via a primary pressure arm pin 606. The lower end of the pressure ear 603 is machined into a V-shaped protrusion that corresponds to the V-shaped groove of the secondary pressure arm 601. Two primary pressure arm supports 607 are vertically symmetrically arranged on either side 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 primary pressure arm straight rod end via a primary pressure arm pin 606. The end of the primary pressure arm annular rod section is connected to the loading force traction assembly 600. With this arrangement, an adjustable loading force system is added to the testing machine to enable the test friction pair to meet different axial loads. Specifically, the loading force traction assembly 600 is connected to the test chamber using the primary and secondary pressure arm assemblies. Simultaneously, the secondary pressure arm 601 and the primary pressure arm 605 must be kept horizontal during installation, allowing the spoke-type pressure sensor 104 to accurately measure the vertical upward axial load. The flexible coupling 502 connects the motor spindle 503 and the bat test piece 100, respectively. This greatly reduces the difficulty of installation and ensures that there will be no unbalanced loading during the test. Furthermore, the design of a multi-track bat fatigue testing machine can be realized by utilizing the cooperation of multiple dual-track bat fatigue co-test pieces and bat fatigue test pieces. Other components and connection relationships are the same as those of the first, second, third, or fourth embodiments.

[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, 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 609, and the loading force bearing nut is connected to the middle part of the loading force screw 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 adjustment slider 610. The two loading force support rods 613 are vertically inserted into the two loading force support rod mounting holes respectively. 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 adjustment slider 610. With this configuration, a loading screw 609 is located below the test bench 2. The loading screw can be adjusted via a loading handwheel 612 to adjust the height of the slider 610, thereby applying a downward force to the loading pull line 608. This simultaneously transmits a downward pulling force to the primary pressure arm 605. The primary pressure arm 605 redirects the downward pulling force, ensuring that the secondary pressure arm 601 is horizontal, allowing the loading force to achieve axial vertical loading. The remaining components and connections are the same as those in Specific Embodiments 1, 2, 3, 4, or 5.

[0054] Specific implementation method seven: combination Figure 7 To describe this embodiment, 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, 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 are vertically arranged between the slide base plate 301 and the slide cover plate 302. The lower ends of the slide stand plates 304 are connected to the upper end of the slide base plate 301, and the upper ends of the slide stand plates 304 are connected to the lower end of the slide cover plate 302. The front ends of the two slide stand plates 304 are mounted with vertically arranged slide working plates 303. Other components and connections are the same as those of the first, second, third, fourth, fifth, or sixth embodiments.

[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 base 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 base 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, and two slide guide rails 405 arranged vertically and symmetrically are respectively provided 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. With this arrangement, the linear slide 4 is installed above the test bench 2. Using 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 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 used in multiple test systems, including assessments of working conditions such as axial load 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 describe this embodiment, the linear slide 4 of the dual-track ball bat fatigue testing machine further includes two upper travel limit blocks 407 and two lower travel limit blocks 408. The upper end of the slide screw 404 is symmetrically provided with two upper travel limit blocks 407 mounted on the front end surface of the slide base plate of the U-shaped slide frame 401. The lower end of the slide screw 404 is provided with two lower travel limit blocks 408 symmetrically mounted on the front end surface of the slide base plate of the U-shaped slide frame 401. Other components and connections are the same as those of the first, second, third, fourth, fifth, sixth, seventh, or eighth embodiments.

[0058] Specific implementation method ten: Combination Figure 8To describe this embodiment, the linear slide 4 of the dual-track ball bat fatigue testing machine also includes a displacement sensor assembly, comprising a displacement sensor 409, a travel sensor baffle 410, a displacement sensor slider 411, and a displacement sensor slider inner sleeve. A displacement sensor slider inner hole is machined vertically in the center of the upper surface of the displacement sensor slider 411. The displacement sensor slider inner sleeve is inserted into the displacement sensor slider inner hole, and the displacement sensor slider inner sleeve is mounted on the slide screw 404. A travel sensor baffle 410 is mounted on the side of the displacement sensor slider 411. The displacement sensor 409 is positioned on the side of the upper travel limit block 407. The front surface of the displacement sensor 409 has a slot extending vertically through the upper and lower surfaces of the displacement sensor 409, corresponding to the upper end of the travel sensor baffle 410. This arrangement allows the displacement sensor 409 to quantify the travel of the linear slide 4, facilitating control of the track spacing between different groups. The remaining components and connections are the same as those of the first, second, third, fourth, fifth, sixth, seventh, eighth, or ninth embodiments.

[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 co-test piece and the dual-track ball bat fatigue co-test piece are clearance-fitted with the test chamber, 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 dual-track ball bat fatigue test assembly is the shaft system consisting of the ball bat test piece 100, the first loading ring 109, the second loading ring 107 and the test rolling element 110. During the test, the three test rolling elements 110 on the upper or lower layer can be distributed around the ball bat test piece 100 at intervals of 120 degrees. The shaft system during the test is as follows: Figure 17 and Figure 18 shown.

[0062] like Figure 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 experienced by the ball-bat test piece 100. The dual-track ball-bat fatigue testing machine primarily improves testing efficiency by enabling two sets of tests with identical stress conditions to be performed simultaneously. The unique shafting structure of the dual-track ball-bat fatigue testing machine and the use of a flexible coupling 502 to connect the ball-bat test piece 100 to the motor main shaft 503 ensure that the entire shafting system will not experience axial load imbalance during testing. During the test, to ensure the same stress conditions in the dual-track test, that is, to ensure that the upper and lower layers of the test rolling elements 110 are subjected to the same stress, the angle α of the upper first loading ring 109 and the angle β of the lower first loading ring 109 must be consistent. The radial contact stress experienced by the ball-bat test piece 100 can thus be calculated using 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] Combine 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 joint bearing 106 allows the entire ball bat test piece 100 to self-adjust to a horizontal position, 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. In addition, multiple groups of tests can be performed on a ball bat test piece without disassembling the test equipment, simply 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. Repeated tests can then be performed on the same ball bat, such as Figure 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 they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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 various embodiments of the present invention.

Claims

1. A dual-track bat fatigue test assembly, characterized by: 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 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); a test chamber cover through hole matching the ball-and-stick test piece (100) is processed 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 slidably coaxially arranged in sequence from top to bottom inside the test base (101); the ball-head pressure head (105) is provided with a plurality of holes. 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 provided 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-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 that match the test rolling bodies (110).

2. The dual-track ball bat fatigue test assembly according to claim 1, characterized in that: A test base loading force assembly port (1011) is provided at the lower 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. Two symmetrically arranged axial holes are respectively processed on the left and right side walls of the rectangular countersunk hole. 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).

3. The dual-track ball 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 elements (110) respectively; an axially arranged oil return groove is processed at the center position 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 end 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 further 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 provided with a slide support frame (3), a vertically arranged linear slide (4) is provided 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 end of the linear slide (4). On the board, the motor main 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); 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 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 side 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) 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 first-level pressure arm (605) includes a first-level pressure arm straight rod end and a first-level pressure arm annular rod section integrally formed with the end of the straight rod end. The first-level pressure arm annular rod section is sleeved on the outside of the test base (101). The middle part of the first-level pressure arm straight rod end is connected to the pressure ear (603) through the first-level 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-level pressure arm (601). Two first-level pressure arm supports (607) are vertically symmetrically arranged on both sides of the end of the first-level pressure arm straight rod end. The lower ends of the two first-level pressure arm supports (607) are connected to the upper end of the test bench (2). The upper ends of the two first-level pressure arm supports (607) are rotatably connected to the end of the first-level pressure arm straight rod end through the first-level pressure arm pin shaft (606). The end of the first-level 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). 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). 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). 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). 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 ring rod segment. The upper end plate of the test bench (2) has a loading force traction line mounting hole. 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 dual-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 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 provided 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).

8. The dual-track ball bat fatigue testing machine according to claim 6 or 7, characterized in that: The linear slide (4) of the dual-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 base 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 base 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 lower baffle of the U-shaped slide frame (401). A slide handwheel (402) is installed on the upper end of the slide screw (404), and a slide bearing nut is installed on the slide screw (404). Two slide guide rails (405) arranged vertically and symmetrically are respectively provided on both sides of the slide screw (404). The lower end of the slide guide rail (405) is connected to the slide bottom 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).

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 further comprises 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); and 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 further comprises a displacement sensor assembly, the displacement sensor assembly comprising a displacement sensor (409), a stroke 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), 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), and a slot is opened on the front surface of the displacement sensor (409) along the vertical direction and penetrates the upper and lower surfaces of the displacement sensor (409), and the slot corresponds to the upper end of the stroke sensor baffle (410).

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