A load adjustment mechanism for a pulley fatigue testing machine

Abstract

This utility model provides a load adjustment mechanism for a pulley fatigue testing machine, comprising: a tilting seat, driven to move laterally by a lateral drive device, wherein one end of the tilting seat is a large end with an outer diameter larger than the other end, and the other end is a small end; the upper and lower sides of the tilting seat are respectively provided with a single shaft for mounting a single pulley and a double shaft for mounting two pulleys, and a movable shaft for mounting a first corner pulley is provided between the double shafts for lateral movement; two guide seats, each laterally slidably connected to a guide rod, the two guide seats fitting and interlocking with the tilting seat to form a tilting area corresponding to the large end of the tilting seat; the tilting seat and the two guide seats are locked or unlocked by a locking mechanism. This not only allows the testing machine to improve the testing efficiency of small-sized pulleys through dual-wheel testing, but also improves the mode switching efficiency through the quick switching between single-wheel and dual-wheel modes of the tilting seat.

Description

Technical Field

[0001] This utility model relates to the field of fatigue testing machines, specifically to a load adjustment mechanism for a pulley fatigue testing machine. Background Technology

[0002] Belt pulleys play a crucial role in belt conveyors. Belt pulley fatigue testing machines are mainly used to test the durability and fatigue performance of belt pulleys by simulating actual working conditions, in order to inspect and further improve the belt pulleys. The parameters for simulating actual working conditions mainly include the adjustment of speed, load, and environmental parameters. Among them, the speed parameter is adjusted by the speed of the drive pulley, the load parameter is adjusted by increasing or decreasing the belt tension or the radial load of the test pulley, and the environmental parameters mainly include temperature and humidity, which can be adjusted through an environmental chamber.

[0003] The existing load adjustment mechanism of the pulley fatigue testing machine mainly adjusts the radial load by adding or removing load wheels in the radial direction of the test wheel. This is very cumbersome to disassemble and assemble. In addition, regardless of the size of the test wheel, only one test wheel can be tested at a time. This results in the testing machine occupying a large amount of horizontal and vertical space. Furthermore, when the test wheel size is small, it is impossible to test multiple test wheels at the same time, resulting in low testing efficiency.

[0004] The research objective of this invention is to design a load adjustment mechanism for a pulley fatigue testing machine that can improve testing efficiency, addressing the problems existing in the prior art. Utility Model Content

[0005] This invention provides a load adjustment mechanism for a pulley fatigue testing machine, which can effectively solve the above-mentioned problems.

[0006] This utility model is implemented as follows:

[0007] A load adjustment mechanism for a pulley fatigue testing machine, comprising:

[0008] The flipping seat is driven to move laterally by a lateral movement drive device. One end of the flipping seat is set as a large end with an outer diameter larger than the other end, and the other end is set as a small end. The upper and lower sides of the flipping seat are respectively provided with a single shaft for installing a single pulley and a double shaft for installing two pulleys. A movable shaft for lateral movement and installation of the first corner wheel is provided between the double shafts.

[0009] Two guide seats are slidably connected to guide rods laterally. The opposing sides of the two guide seats are adapted to fit and interlock with the flip seat to form a flipping area corresponding to the large end of the flip seat. The flip seat and the two guide seats are locked or unlocked by a locking mechanism. After the locking mechanism is unlocked, when the flip seat moves laterally away from the two guide seats until the small end is located in the flipping area, the flip seat can flip up and down. After flipping up and down, the flip seat moves laterally to reset and interlock with the two guide seats and is locked by the locking mechanism.

[0010] Furthermore, the lateral movement drive device includes a lateral movement screw driven by a motor, and the flipping seat is screwed onto the lateral movement screw. The large end of the flipping seat is provided with a telescopic docking rod that corresponds to the two guide seats respectively. The two guide seats are respectively recessed with docking grooves corresponding to the two docking rods. After the flipping seat flips up and down, the two docking rods extend and dock with the two docking grooves, and the lateral movement screw drives the flipping seat to move laterally and reset.

[0011] Furthermore, one end of the transverse lead screw is partially provided with an unthreaded clamping portion, and one end of each of the two docking rods is provided with a pushing portion. The flipping seat is provided with two clamping members connected to a return spring and longitudinally sliding. The proximal ends of the two clamping members respectively form clamping portions for limiting and clamping the clamped portion, and the distal ends respectively correspond to the two pushing portions. The two docking rods are driven to extend and retract laterally by the docking drive device. After the locking mechanism is unlocked, when the flipping seat moves laterally away from the two guide seats until the small end is located in the flipping area and the two clamping members correspond to the clamped portion, the two docking rods retract laterally and push the two clamping members to clamp the clamped portion towards each other through the pushing portion. After the flipping seat flips up and down, the two docking rods extend and dock with the two docking grooves, and the two clamping members are reset and disengaged from the clamping portion by the tension of the return spring.

[0012] Furthermore, the locking mechanism includes two locking members that are respectively slidably disposed longitudinally within the two guide seats and driven longitudinally by the locking drive device. The two docking grooves and the two docking rods have longitudinal through holes in their sidewalls. The opposing sides of the two guide seats are respectively provided with shock-absorbing layers, and the shock-absorbing layers are filled with shock-absorbing elements. After the two docking rods are respectively inserted into the two docking grooves, when the locking mechanism locks, the two locking members move toward each other and respectively penetrate and lock the docking grooves and docking rods.

[0013] Furthermore, the distal ends of the two locking members are respectively provided with actuating portions extending downwards. The locking mechanism also includes two limiting members respectively rotatably disposed in the lower part of the two guide seats by torsion springs. The upper end of the limiting member corresponds to the actuating portion, and the lower end forms a limiting portion corresponding to the arc shape of the outer wall of the guide rod. When the locking mechanism is unlocked, the two locking members move in opposite directions and are respectively actuated by the actuating portions to swing the lower ends of the two limiting members toward each other and limit them to fit against the outer wall of the guide rod. When the locking mechanism is locked, the two locking members move toward each other and respectively penetrate and lock the docking groove and the docking rod. The two limiting members are respectively driven by the torsion springs to reset and disengage from the guide rod.

[0014] Furthermore, the two guide rods are respectively recessed on their distal sides and provided with a plurality of axially spaced limiting grooves, the two limiting parts respectively corresponding to the plurality of limiting grooves, and the two guide seats are laterally limited and slidably configured.

[0015] Furthermore, the flipping seat is provided with a laterally extending slide groove, a top rod that is laterally screwed through one side of the slide groove, and an adjusting motor for driving the top rod to rotate. The movable shaft is laterally slidably connected to the slide groove via a slider, and the end of the top rod is rotatably connected to the slider. The adjusting motor drives the top rod to rotate to adjust the screwing depth, thereby driving the slider to move laterally for adjustment.

[0016] The beneficial effects of this utility model are:

[0017] 1. The design of the flip-top allows for testing in either single-pulley or double-pulley mode when dealing with pulleys of different sizes. Switching between these modes is achieved automatically by the flip-top, eliminating the need for manual disassembly and replacement of the base, and adjustment of component connections to meet test requirements. This significantly reduces the time spent switching between single-pulley and double-pulley modes, improving testing efficiency for small pulleys through double-pulley testing and enhancing mode switching efficiency through the rapid flip-top switching. Furthermore, to prevent interference during flip-top rotation, it is detachably integrated with the two guide seats. The flip-top is designed with one end larger than the other, and the two guide seats are designed to accommodate the larger end. The flipping area allows the flipping seat to flip up and down without interference when it moves laterally to the flipping area corresponding to the small end. This improves the ease of flipping the seat while avoiding interference. At the same time, to improve the connection stability between the flipping seat and the two guide seats, a locking mechanism is used to lock the two together. The large end of the flipping seat is close to the drive wheel. Thus, when it is necessary to increase the load and the flipping seat stretches the transmission belt away from the drive wheel, the large end of the flipping seat is fully limited and fitted into the flipping area, driving the two guide seats to move laterally. This ensures that the flipping seat will not detach from the two guide seats, greatly improving the connection stability between the flipping seat and the two guide seats. This achieves the effect that the flipping seat can both detach from the two guide seats for flipping and be stably connected to them for stable load increases and decreases.

[0018] 2. The accuracy of the load adjustment mechanism is improved by using a transverse lead screw. In order to achieve stable reset of the flip seat after flipping, a retractable connecting rod is added. When the flip seat is detached from the two guide seats and flips up and down but loses its limit and cannot be driven to move laterally by the transverse lead screw, the connecting rod can extend out to the docking groove of the two guide seats for limit guidance. Thus, the flip seat can be stably reset and connected to the two guide seats under the drive of the transverse lead screw. This ensures that the flip seat can be easily flipped to facilitate the switching between single-wheel mode and double-wheel mode. In addition, the lead screw and the two guide rods together guide the lateral movement of the connected flip seat and guide seats, improving the stability of the lateral movement of the three.

[0019] 3. By adding the clamping part and the clamping piece, after the locking mechanism is unlocked, the flipping seat moves laterally away from the two guide seats until the other end is located in the flipping area and the two clamping pieces correspond to the clamping part. The two docking rods retract laterally and push the two clamping pieces to clamp the clamping part towards each other through the pushing part. After the flipping seat flips up and down, the two docking rods extend out and dock with the two docking slots. The two clamping pieces are reset and released from the clamping part by the tension of the reset spring. Thus, under the premise that the flipping seat and guide seat move laterally towards the drive wheel until the pulley is detachable, the clamping part clamps the clamped part, and the long-distance screw connection between the flipping seat and the transverse lead screw is set to achieve a stable connection between the flipping seat and the transverse lead screw during flipping. This ensures that the flipping seat is not affected by its own weight, improves the stability and accuracy of the flipping seat flipping, and ensures that the flipping seat can be reset and engaged with the two guide seats after a precise 180° flipping. This ensures the stability of switching between single wheel mode and double wheel mode. Furthermore, the reset spring ensures that after the flipping seat is flipped, the two clamping parts reset and disengage from the transverse lead screw, thereby avoiding any impact on the transverse movement of the flipping seat and ensuring transverse movement stability.

[0020] 4. By bringing the large end of the tilting seat closer to the drive wheel to improve the stability of the connection between the three components when the load is increased, the longitudinal through-hole locking rod of the locking component is sufficient to ensure that the tilting seat will not detach from the two guide seats when the load needs to be reduced and the tilting seat moves towards the drive wheel. This further improves the stability of the connection between the three components. In addition, the addition of a shock-absorbing interlayer reduces the vibration intensity between the tilting seat and the two guide seats, thereby avoiding the high-frequency, high-intensity vibration between the tilting seat and the two guide seats during the test when the pulley rotates at high speed, which could cause the locking component, the connecting rod, etc. to break and the locking mechanism to fail. This improves the stability of the tilting seat and the two guide seats after they are connected during the test.

[0021] 5. By adding limiting components, when the locking mechanism is locked, the two locking components move towards each other, passing through the locking docking groove and the docking rod respectively. The two limiting components are then reset and disengaged from the guide rod by the torsion springs. This achieves the goal of limiting the guide rod's lateral movement by the limiting part of the limiting component when the locking mechanism unlocks and the flipping seat is about to disengage from the two guide seats. This prevents the guide seats from sliding during the flipping seat's lateral movement, which could lead to the docking rod not completely disengaging from the guide seats and preventing the flipping seat from flipping. It also prevents mechanical control errors caused by different docking progress of the two docking rods during the flipping seat's reset. The limiting component's setting of the guide seat ensures the stability of the disengagement and docking between the flipping seat and the guide seat. Furthermore, the limiting component is designed to be driven by the locking component, so that the flipping seat and the guide seat are engaged and the two docking rods extend into the docking groove simultaneously. After the locking component extends and passes through the docking rod, the limiting component can be reset under the action of the torsion spring, thus not affecting the lateral sliding of the flipping seat and the guide seat after successful docking. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a belt pulley fatigue testing machine.

[0023] Figure 2 for Figure 1 A schematic diagram of the structure after removing the base and protective cover.

[0024] Figure 3 This is a partial structural diagram of the load adjustment mechanism.

[0025] Figure 4 for Figure 3 A partial structural diagram of the flipper after it has been flipped over and a pulley has been installed.

[0026] Figure 5 for Figure 3 A schematic diagram of the vertical cross-sectional structure.

[0027] Figure 6 for Figure 3 A schematic diagram of the structure after removing one side of the guide seat.

[0028] Figure 7 This is a cross-sectional view of the structure of the flip seat in its flip-up state after unlocking.

[0029] Figure 8 This is a schematic diagram of the transverse cross-sectional structure when the flip seat is flipped and docked with the guide seat.

[0030] Figure 9 This is a partial structural diagram of the clamping component and the transverse lead screw.

[0031] Figure 10 This is a partial structural diagram of the clamping member and the transverse lead screw in another embodiment. Detailed Implementation

[0032] Reference Figure 1-10 As shown, a load adjustment mechanism for a pulley fatigue testing machine:

[0033] Specifically, the pulley fatigue testing machine includes:

[0034] The speed regulating mechanism 1 includes a transmission belt 11 and a drive wheel 12 driven to rotate by the rotation drive device 13;

[0035] Load regulating mechanism 2;

[0036] Angle adjustment mechanism 4 includes a first angle wheel 41 and two second angle wheels 42 located between the drive wheel 12 and the tilting seat 22 and driven by an adjustment drive device to press against the transmission belt 11. The first angle wheel 41 and the second angle wheel 42 are both located outside the transmission belt 11. The two second angle wheels 42 are respectively rotatably mounted on two drive seats 43. The adjustment drive device includes a first lead screw 44 driven by a motor to drive the two drive seats 43 to move longitudinally in opposite directions or in the same direction, and two second lead screws 45 driven by a motor to drive the first lead screw 44 to move laterally.

[0037] The machine base 6 and the protective cover 7 are mounted on the machine base 6. The load adjustment mechanism 2, the speed adjustment mechanism 1, and the wrap angle adjustment mechanism 4 are all mounted on the machine base 6 and located inside the protective cover 7.

[0038] Control system, used to control the operation of various mechanisms;

[0039] The detection system is used to detect various test data. Specifically, the detection system includes sensors for detecting load, tensile displacement, rotational speed, etc. The specific structure is not the focus of this application and will not be described in detail here. The speed adjustment mechanism 1 is mentioned.

[0040] The load adjustment mechanism 2 includes:

[0041] The flip seat 22 is driven to move laterally by the lateral movement drive device 21. One end of the flip seat 22 is a large end 221 with an outer diameter larger than the other end, and the other end is a small end 222. The upper and lower sides of the flip seat 22 are respectively provided with a single shaft 223 for installing a single pulley 5 and a double shaft 224 for installing two pulleys 5. A movable shaft 225 for lateral movement and installation of the first corner wheel 41 is provided between the double shafts 224.

[0042] Two guide seats 23 are slidably connected to guide rods 24. The two guide seats 23 are adapted to fit and interlock with the flip seat 22 on their opposite sides to form a flip area 231 corresponding to the large end 221 of the flip seat 22. The flip seat 22 and the two guide seats 23 are locked or unlocked by a locking mechanism 3. When the locking mechanism 3 is unlocked, the flip seat 22 moves laterally away from the two guide seats 23 until the small end 222 is located in the flip area 231. The flip seat 22 can then flip up and down. After flipping up and down, the flip seat 22 moves laterally back to fit into the two guide seats 23 and is locked by the locking mechanism 3.

[0043] The aforementioned structure, through the design of the flip seat 22, allows for selection of single-wheel or double-wheel mode for testing when facing pulleys 5 of different sizes. Switching between the two modes is achieved automatically by the flip seat 22, eliminating the need for manual disassembly and replacement of the seat body and adjustment of the connection accuracy of various parts to meet test requirements. This significantly saves time spent switching between single-wheel and double-wheel modes on the testing machine. Therefore, it not only improves the testing efficiency of small-sized pulleys 5 through double-wheel testing but also enhances mode switching efficiency through the rapid switching of the flip seat 22. Furthermore, to avoid interference during the flipping of the flip seat 22, it is detachably connected to the two guide seats 23. The flip seat 22 is designed with one end larger than the other, and a flipping area 231 between the two guide seats 23 is designed to accommodate the larger end 221, thus enabling the flip seat 22 to achieve its optimal configuration. When the flipping seat 22 is moved laterally to the flipping area 231 corresponding to the small end 222, it can flip up and down without interference. This improves the ease of flipping the flipping seat 22 while avoiding interference. At the same time, in order to improve the connection stability between the flipping seat 22 and the two guide seats 23, the two are locked by the locking mechanism 3. The large end 221 of the flipping seat 22 is close to the drive wheel 12. Thus, when it is necessary to increase the load and the flipping seat 22 stretches the transmission belt 11 away from the drive wheel 12, the large end 221 of the flipping seat 22 is fully limited and fitted into the flipping area 231 and drives the two guide seats 23 to move laterally. This ensures that the flipping seat 22 will not detach from the two guide seats 23, which greatly improves the connection stability between the flipping seat 22 and the two guide seats 23. This achieves the effect that the flipping seat 22 can both detach from the two guide seats 23 for flipping and can be stably connected to them for stable load increase and decrease.

[0044] To improve the driving accuracy of the lateral movement drive device 21, the lateral movement drive device 21 includes a lateral movement screw 211 driven by a motor. The flipping seat 22 is screwed onto the lateral movement screw 211. The large end 221 of the flipping seat 22 is provided with telescopic docking rods 226 that correspond to the two guide seats 23 respectively. The two guide seats 23 are respectively recessed with docking grooves 232 corresponding to the two docking rods 226. After the locking mechanism 3 is unlocked, when the flipping seat 22 moves laterally away from the two guide seats 23 until the small end 222 is located in the flipping area 231, the flipping seat 22 is rotated up and down by the rotation drive of the lateral movement screw 211. The two docking rods 226 extend and dock with the two docking grooves 232. The lateral movement screw 211 drives the flipping seat 22 to move laterally and reset. The above structure improves the accuracy of the load adjustment mechanism 2 through the transverse lead screw 211. On this basis, in order to achieve stable reset of the flip seat 22 after flipping, a telescopic docking rod 226 is added. When the flip seat 22 is disengaged from the two guide seats 23 and flips up and down but loses its limit and cannot be driven to move laterally by the transverse lead screw 211, the docking rod 226 can extend out to dock with the docking groove 232 of the two guide seats 23 for limit guidance. Thus, under the drive of the transverse lead screw 211, the flip seat 22 can be stably reset and fit into the two guide seats 23. This ensures that the flip seat 22 can be easily flipped to facilitate switching between single wheel mode and double wheel mode. In addition, the lead screw and the two guide rods 24 together guide the lateral movement of the connected flip seat 22 and guide seats 23, improving the stability of the lateral movement of the three.

[0045] Since the flip seat 22 has a certain weight, to prevent it from being unable to rotate and flip due to its own weight, or from failing to connect with the two guide seats 23 due to insufficient flipping angle, the flip seat 22 is provided with a partially unthreaded clamping part 2111 at one end to improve the flipping stability of the flip seat 22. A pushing part 2261 is provided at one end of each of the two connecting rods 226, and a connecting return spring 2 is provided inside the flip seat 22. 27. Two clamping members 228 are arranged longitudinally and slidingly. The proximal ends of the two clamping members 228 respectively form clamping parts 2281 for limiting and clamping the clamped part 2111, and the distal ends respectively correspond to the two pushing parts 2261. The two docking rods 226 are respectively driven by docking drive device 229 to extend and retract laterally. Specifically, the upper and lower sides of the clamping members 228 are respectively connected to the inner wall of the flipping seat 22 through return springs 227. The opposing sides of the two clamping parts 2281 are made of a high-friction, non-slip material. In another embodiment, the outer wall of the clamping portion 2111 may also be circumferentially recessed with a plurality of clamping grooves 2112, and the opposite sides of the two clamping portions 2281 may be provided with a plurality of clamping protrusions 2282 corresponding to the plurality of clamping grooves 2112, thereby further improving the limiting strength of the two clamping members 228 after clamping the clamping portion 2111; the above structure, through the addition of the clamping portion 2111 and the clamping member 228, allows the flipping seat 22 to move laterally away from the two clamping portions after the locking mechanism 3 is unlocked. When the guide seat 23 to the small end 222 is located within the flipping area 231 and the two clamping members 228 correspond to the clamped part 2111, the two docking rods 226 retract laterally and push the two clamping members 228 to clamp the clamped part 2111 towards each other through the pushing part 2261. After the flipping seat 22 flips up and down, the two docking rods 226 extend and dock with the two docking grooves 232. The two clamping members 228 are reset and disengaged from the clamping part 2281 by the tension of the reset spring 227. Thus, under the premise that the flipping seat 22 and the guide seat 23 can be detached from the pulley 5 when they move laterally toward the drive wheel 12, the clamping part 2281 clamps the clamped part 2111 and the long-distance screw connection between the flipping seat 22 and the transverse screw 211 is set to achieve a stable connection between the flipping seat 22 and the transverse screw 211 when flipping. This ensures that the flipping seat 22 is not affected by its own weight, improves the stability and accuracy of the flipping seat 22, and ensures that the flipping seat 22 can be reset and engaged with the two guide seats 23 after it has been accurately flipped 180°. This ensures the stability of the switching between single wheel mode and double wheel mode. Furthermore, the reset spring 227 ensures that after the flipping seat 22 is flipped, the two clamping parts 228 reset and disengage from the transverse screw 211, thereby avoiding any impact on the transverse movement of the flipping seat 22 and ensuring transverse movement stability.

[0046] To improve the connection stability between the flip seat 22 and the two guide seats 23, the locking mechanism 3 includes two locking members 31 that are respectively longitudinally slidably disposed in the two guide seats 23 and driven longitudinally by the locking drive device 32. The two docking grooves 232 and the two docking rods 226 have longitudinal through holes in their side walls. The opposing sides of the two guide seats 23 are respectively provided with shock-absorbing sandwich layers 233, and the shock-absorbing sandwich layers 233 are filled with shock-absorbing elements. Specifically, the shock-absorbing elements are a number of damping particles. When vibration occurs between the flip seat 22 and the guide seat 23, the energy can be weakened by the collision between the number of damping particles. After the two docking rods 226 are respectively inserted into the two docking grooves 232, when the locking mechanism 3 locks, the two locking members 31 move towards each other and respectively penetrate and lock the docking grooves 232 and the docking rods 226. By bringing the large end 221 of the flip seat 22 closer to the drive wheel 12 to improve the stability of the connection between the three components when the load is increased, the longitudinal through-hole locking rod 226 of the locking member 31 is sufficient to ensure that when the load needs to be reduced and the flip seat 22 moves towards the drive wheel 12, and the flip seat 22 is gradually reduced by the tension of the transmission belt 11, the flip seat 22 will not detach from the two guide seats 23, further improving the stability of the connection between the three components. In addition, the addition of the shock-absorbing interlayer 233 reduces the vibration intensity between the flip seat 22 and the two guide seats 23, thereby avoiding the high-frequency and high-intensity vibration between the flip seat 22 and the two guide seats 23 during the test when the pulley 5 rotates at high speed, which would cause the locking member 31, the locking rod 226, etc. to break, and cause the locking mechanism 3 to fail. This improves the stability of the flip seat 22 and the two guide seats 23 after connection during the test.

[0047] To ensure the stability of the docking of the flip seat 22 and the two guide seats 23, the distal ends of the two locking members 31 are respectively provided with actuating parts 33 extending downwards. The locking mechanism 3 also includes two limiting members 34 that are rotatably disposed in the lower part of the two guide seats 23 by torsion springs 35. The upper end of the limiting member 34 corresponds to the actuating part 33, and the lower end forms a limiting part corresponding to the arc shape of the outer wall of the guide rod 24. When the locking mechanism 3 is unlocked, the two locking members 31 move in opposite directions and are respectively actuated by the actuating part 33 to swing the lower ends of the two limiting members 34 toward each other and limit them to fit against the outer wall of the guide rod 24. With the addition of the limiting members 34, the above structure allows the two locking members 31 to move toward each other and pass through and lock the docking groove 232 and the docking rod 226 when the locking mechanism 3 is locked. The two limiting members 34 are respectively driven by the torsion springs 35 to reset and disengage from the guide rod 24. When the locking mechanism 3 unlocks and the flip seat 22 is about to detach from the two guide seats 23, the limiting part of the limiting member 34 limits the lateral movement of the guide seat 23 by adhering to the outer wall of the guide rod 24. This prevents the flip seat 22 from sliding when it detaches from the two guide seats 23, which could lead to the docking rod 226 not completely detaching from the guide seat 23 and thus preventing the flip seat 22 from flipping. Alternatively, it could prevent the two docking rods 226 from docking at different rates when the flip seat 22 is reset, resulting in mechanical control errors. The limiting member 34 ensures the stability of the detachment and docking between the flip seat 22 and the guide seat 23 by limiting the guide seat 23. Furthermore, the limiting member 34 is set to be driven by the locking member 31, so that the flipping seat 22 and the guide seat 23 are engaged and the two docking rods 226 are simultaneously extended into the docking groove 232. After the locking member 31 extends through the docking rod 226, the limiting member 34 can be reset under the action of the torsion spring 35, so as not to affect the lateral sliding after the flipping seat 22 and the guide seat 23 are successfully docked.

[0048] To improve the limiting stability of the limiting member 34, several axially spaced limiting grooves 241 are recessed on the distal sides of the two guide rods 24. Each of the two limiting parts corresponds to one of the limiting grooves 241. When the locking mechanism 3 unlocks, the two locking members 31 move in opposite directions and are respectively propelled by the actuating part 33 to swing and engage with the lower ends of the two limiting members 34 into the limiting grooves 241. The two guide seats 23 are laterally slidably limited. Specifically, the bottoms of the two guide seats 23 can be laterally slidably connected to the base 6 via sliders and slide rails. Thus, by adding the limiting grooves 241 and through the lateral limiting engagement of the limiting part and the limiting grooves 241, the limiting stability of the limiting member 34 is improved, further enhancing the stability of the limiting of the guide seats 23.

[0049] To improve the efficiency and accuracy of the lateral adjustment of the first corner pulley 41, the flipping seat 22 is provided with a laterally extending groove 46, a top rod 47 laterally screwed through one side of the groove 46, and an adjusting motor 48 for driving the top rod 47 to rotate. The movable shaft 225 is laterally slidably connected to the groove 46 via a slider, and the end of the top rod 47 is rotatably connected to the slider. The adjusting motor 48 drives the top rod 47 to rotate to adjust the screwing depth, thereby driving the slider to move laterally for adjustment. Thus, the automatic lateral movement of the first corner pulley 41 is achieved by the adjusting motor 48 driving the top rod 47, improving the efficiency and accuracy of the lateral adjustment of the first corner pulley 41, thereby improving the adaptability of the transmission belt 11 to the corner adjustment of the pulley 5, and improving the efficiency and accuracy of the corner adjustment.

[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A load adjusting mechanism for a pulley fatigue testing machine, characterized by, include: The flip seat (22) is driven to move laterally by the lateral drive device (21). One end of the flip seat (22) is set as a large end (221) with an outer diameter larger than the other end, and the other end is set as a small end (222). The upper and lower sides of the flip seat (22) are respectively provided with a single shaft (223) for installing a single pulley (5) and a double shaft (224) for installing two pulleys (5). A movable shaft (225) for lateral movement and for installing the first corner wheel (41) is provided between the double shafts (224). Two guide seats (23) are slidably connected to guide rods (24) respectively. The two guide seats (23) are adapted to fit and fit into the flip seat (22) on the opposite side to form a flip area (231) corresponding to the large end (221) of the flip seat (22). The flip seat (22) and the two guide seats (23) are locked or unlocked by a locking mechanism (3). After the locking mechanism (3) is unlocked, the flip seat (22) moves laterally away from the two guide seats (23) until the small end (222) is located in the flip area (231). The flip seat (22) can flip up and down. After flipping up and down, the flip seat (22) moves laterally back to fit into the two guide seats (23) and is locked by the locking mechanism (3).

2. A load adjusting mechanism for a pulley fatigue testing machine according to claim 1, wherein The transverse drive device (21) includes a transverse lead screw (211) driven by a motor. The flip seat (22) is screwed onto the transverse lead screw (211). The large end (221) of the flip seat (22) is provided with a telescopic docking rod (226) that corresponds to the two guide seats (23). The two guide seats (23) are respectively recessed with docking grooves (232) corresponding to the two docking rods (226). After the flip seat (22) flips up and down, the two docking rods (226) extend and dock with the two docking grooves (232). The transverse lead screw (211) drives the flip seat (22) to transversely move and reset.

3. A load adjusting mechanism for a pulley fatigue testing machine according to claim 2, wherein One end of the transverse lead screw (211) is partially provided with an unthreaded clamping part (2111), and one end of each of the two docking rods (226) is provided with a pushing part (2261). The flipping seat (22) is provided with two clamping members (228) connected to a return spring (227) and longitudinally sliding. The proximal ends of the two clamping members (228) respectively form clamping parts (2281) for limiting and clamping the clamping part (2111), and the distal ends respectively correspond to the two pushing parts (2261). The two docking rods (226) are driven to extend and retract laterally by the docking drive device (229). The locking mechanism (3) unlocks. Afterwards, when the flipping seat (22) moves laterally away from the two guide seats (23) until the small end (222) is located in the flipping area (231) and the two clamping members (228) correspond to the clamped part (2111), the two docking rods (226) retract laterally and push the two clamping members (228) to clamp the clamped part (2111) in opposite directions through the pushing part (2261). After the flipping seat (22) flips up and down, the two docking rods (226) extend and dock with the two docking grooves (232). The two clamping members (228) are reset and disengaged from the clamping part (2281) by the tension of the reset spring (227).

4. A load adjusting mechanism for a pulley fatigue testing machine according to claim 2, wherein The locking mechanism (3) includes two locking members (31) that are respectively slidably disposed in the two guide seats (23) and driven to move longitudinally by the locking drive device (32). The two docking grooves (232) and the two docking rods (226) have through holes that run longitudinally through their side walls. The two guide seats (23) have shock-absorbing sandwich layers (233) on their opposite sides, and the shock-absorbing sandwich layers (233) are filled with shock-absorbing elements. When the two docking rods (226) are inserted into the two docking grooves (232) respectively, the locking mechanism (3) locks the two locking members (31) and they move toward each other to lock the docking grooves (232) and the docking rods (226) respectively.

5. A load adjusting mechanism for a pulley fatigue testing machine as set forth in claim 4, wherein The two locking members (31) are respectively provided with a toggle part (33) extending downward from their distal ends. The locking mechanism (3) also includes two limiting members (34) which are respectively rotatably disposed in the lower part of the two guide seats (23) by torsion springs (35). The upper end of the limiting member (34) corresponds to the toggle part (33), and the lower end forms a limiting part corresponding to the arc shape of the outer wall of the guide rod (24). When the locking mechanism (3) is unlocked, the two locking members (31) move in opposite directions and respectively toggle the lower ends of the two limiting members (34) to swing towards each other and limit them to fit against the outer wall of the guide rod (24) by the toggle part (33). When the locking mechanism (3) is locked, the two locking members (31) move towards each other and respectively penetrate and lock the docking groove (232) and the docking rod (226). The two limiting members (34) are respectively driven by the torsion springs (35) to reset and disengage from the guide rod (24).

6. A load adjusting mechanism for a pulley fatigue testing machine as set forth in claim 5, wherein The two guide rods (24) are respectively recessed on their far sides and provided with a plurality of axially spaced limiting grooves (241). The two limiting parts correspond to the plurality of limiting grooves (241) respectively, and the two guide seats (23) are laterally limited and slidably arranged.

7. A load adjusting mechanism for a pulley fatigue testing machine as set forth in claim 1, wherein The flipping seat (22) is provided with a horizontally extending slide groove (46), a top rod (47) that is horizontally screwed through one side of the slide groove (46), and an adjusting motor (48) for driving the top rod (47) to rotate. The movable shaft (225) is horizontally slidably connected to the slide groove (46) through a slider. The end of the top rod (47) is rotatably connected to the slider. The adjusting motor (48) drives the top rod (47) to rotate to adjust the screwing depth, thereby driving the slider to move horizontally for adjustment.

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