A fatigue strength testing device for the opening and closing of the side panels of a semi-trailer.

Abstract

This invention belongs to the technical field of fatigue strength testing devices, and particularly relates to a fatigue strength testing device for the opening and closing of the side panels of a semi-trailer, comprising: a frame; a frame base, a positioning mechanism, a rocker arm, a crank arm, a power source, a connecting rod, an adjustment mechanism, and a locking mechanism; compared with the prior art, the fatigue strength testing device for the opening and closing of the side panels of a semi-trailer of this invention can meet the fatigue testing requirements for the opening and closing of large side panels or tailgates, and has the characteristics of adapting to different widths of trailers, convenient installation and positioning of the test panel, and efficient adjustment and locking operation of the clamping mechanism, and has the advantages of simple structure, convenient operation, and high testing accuracy.

Description

Technical Field

[0001] This invention belongs to the technical field of fatigue strength testing devices, and particularly relates to a fatigue strength testing device for the opening and closing of the side panels of a semi-trailer. Background Technology

[0002] The side panels and tailgates of semi-trailers and commercial trucks are critical components for loading and unloading cargo. Their hinges, locks, and other structural components are subjected to repeated opening and closing loads during long-term use, and their fatigue life directly affects driving safety and cargo sealing. Therefore, the opening and closing fatigue strength of the side panels / tailgates needs to be tested before the truck leaves the factory or during the design verification stage.

[0003] Currently, there is equipment available for fatigue testing of vehicle opening and closing components. For example, in the passenger car sector, there are robot-based door opening and closing durability testing systems that can perform whole-vehicle and body-in-white tests, evaluating the comprehensive performance and durability of side-opening door assemblies such as sheet metal, hinges, limiters, door locks, and sealing strips. In the railway vehicle sector, there are also fatigue testing devices for opening and closing operable windows or inspection doors, using cylinders or rotary cylinders to drive the door panels.

[0004] However, existing testing equipment has the following shortcomings: 1. Lack of dedicated testing equipment for large trailer side panels or tailgates: Existing equipment is mostly designed for passenger car doors or small inspection doors of railway vehicles. The output torque of its drive mechanism and the clamping method cannot meet the testing requirements of semi-trailer side panels / tailgates (width 1.5-2.5 meters, weight 80-200 kg).

[0005] 2. Difficulty in adapting to different widths of carriages: The width of carriages varies greatly among different vehicle models. The clamping mechanism of existing devices is mostly fixed. When the width of the test plate changes, the clamping mechanism cannot be flexibly adjusted to adapt to test objects of different sizes. As a result, a single device can only test carriage components of a single specification, resulting in poor equipment versatility.

[0006] 3. Inconvenient installation and positioning of the test panel: When installing the test panel or tailgate, the existing equipment lacks a structure that can quickly and accurately position the panel. Operators need to spend a lot of time on alignment and adjustment, resulting in low installation efficiency and difficulty in guaranteeing positioning accuracy.

[0007] 4. The position adjustment and locking operation of the clamping mechanism is cumbersome. In existing equipment, when it is necessary to adjust the position of the clamping mechanism on the rocker arm, it is usually necessary to operate multiple locking parts separately. After the adjustment is completed, they need to be locked one by one. The operation steps are numerous and the efficiency is low. Moreover, the clamping mechanism is prone to displacement or unreliable locking during the adjustment process.

[0008] Therefore, improvements to the existing testing equipment are still needed. Summary of the Invention

[0009] The purpose of this invention is to address the aforementioned technical problems by providing a fatigue strength testing device for the opening and closing of the side panels of a semi-trailer. This device can meet the fatigue testing requirements for the opening and closing of large side panels or tailgates, and features adaptability to different widths of trailers, convenient installation and positioning of the test panel, and efficient adjustment and locking of the clamping mechanism. It also has the advantages of simple structure, convenient operation, and high testing accuracy.

[0010] In view of this, the present invention provides a device for testing the fatigue strength of the opening and closing of the side panel of a semi-trailer, comprising: a frame; A frame base is provided with a positioning mechanism for mounting the hinge end of the board under test. The positioning mechanism includes a first positioning seat and a second positioning seat. The first positioning seat is provided with a first positioning hole for the lower end of the hinge end of the board under test to be inserted. The second positioning seat is detachably disposed above the first positioning seat. The bottom surface of the second positioning seat is provided with a second positioning hole for the upper end of the hinge end of the board under test to be inserted. The rocker arm has its first end rotatably connected to the frame, and its rotation center is coaxially distributed with the first positioning hole. The second end of the rocker arm is provided with a clamping mechanism for clamping the movable end of the test plate. The crank rod has its first end rotatably mounted on the frame and connected to a power source. The second end of the crank rod is connected to the first end of a connecting rod, and the second end of the connecting rod is connected to a rocker arm. The crank rod, connecting rod, and rocker arm form a crank-rocker mechanism. An adjustment mechanism is included, which can adjust the position of the clamping mechanism along the length of the rocker arm. The locking mechanism is located on the joystick and can lock or unlock the clamping mechanism at its current position on the joystick.

[0011] In the above technical solution, a first installation space is provided between the first positioning seat and the frame for the first end of the rocker arm to enter. The first end of the rocker arm is provided with a shaft hole. A detachable positioning post is provided on the frame, and the positioning post can be inserted into the shaft hole from the bottom of the frame.

[0012] In the above technical solution, a positioning screw is further provided on the frame base, and an insertion hole is provided on the second positioning seat. The second positioning seat is sleeved on the outside of the positioning screw through the insertion hole, and a limiting nut is provided on the positioning screw to restrict the second positioning seat from moving along the axial direction of the positioning screw.

[0013] In the above technical solution, furthermore, a mounting groove is provided at the end of the second end of the rocker arm, and the adjustment mechanism includes: An adjusting seat is slidably disposed in a mounting groove along the length of the rocker arm, and a clamping mechanism is disposed on the adjusting seat; A rack is provided at the bottom of the adjusting seat along the sliding direction of the adjusting seat; The gear is rotatably mounted in the mounting slot and meshes with the rack. When the gear rotates, it can drive the rack to move along the length of the rocker arm. One end of the gear's drive shaft extends to the outside of the rocker arm and has a handwheel at the end.

[0014] In the above technical solution, furthermore, multiple locking grooves are provided at intervals along the length direction of the rocker arm on both sides of the bottom surface of the adjusting seat, and the locking mechanism includes: The locking seat is set in the mounting groove in a direction perpendicular to the sliding direction of the adjusting seat. Multiple locking blocks are spaced apart on both sides of the locking seat along the length of the rocker arm. The number of locking blocks is less than the number of locking slots. When the locking seat moves toward the adjusting seat, the multiple locking blocks can be inserted into the corresponding multiple locking slots at the same time, thereby restricting the sliding of the adjusting seat. When the locking seat moves away from the adjusting seat, the multiple locking blocks can be disengaged from the corresponding multiple locking slots at the same time, thereby releasing the sliding restriction on the adjusting seat. The locking seat is rotatably mounted in the mounting groove in the middle. A locking tooth assembly is provided at the end of the locking seat near the gear. When the locking seat swings towards the gear, the locking tooth assembly can mesh with the gear, thereby restricting the rotation of the gear. When the locking seat swings away from the gear, the locking tooth assembly separates from the gear, thereby releasing the restriction on the rotation of the gear. The linkage transmission mechanism can drive the locking seat to swing towards the gear while simultaneously driving the locking seat to move closer to the adjusting seat; the linkage transmission mechanism can also drive the locking seat to swing away from the gear while simultaneously driving the locking seat to move away from the adjusting seat.

[0015] In the above technical solution, furthermore, a guide hole is provided on the adjusting seat along the length direction of the rocker arm, and the end of the locking seat away from the locking gear assembly is located below the locking seat. The linkage transmission mechanism includes: The lower end of the pressure rod is detachably mounted on the locking seat, and the upper end of the pressure rod extends through the guide hole to the top of the adjusting seat. The first reset elastic element is disposed on the bottom surface of the mounting groove, and the upper end of the first reset elastic element is in contact with the bottom surface of the locking seat. The second reset elastic element is disposed on the bottom surface of the mounting groove, and the upper end of the second reset elastic element contacts the bottom surface of the locking seat at the end away from the locking tooth assembly. The pressing component is mounted on the rocker arm and is located above the pressure rod. The pressing component can press the pressure rod downward, causing the locking seat to move downward away from the adjusting seat and compress the first reset elastic element. During this process, the locking seat presses the end of the locking seat away from the locking gear assembly downward and compresses the second reset elastic element, thereby causing the locking block to exit the locking groove and simultaneously driving the locking gear assembly away from the gear.

[0016] In the above technical solution, the pressing component further includes a fixed frame, a swing push plate, an electromagnet, an iron sheet, and a pressing power supply. The fixed frame is mounted on the rocker arm. The first end of the swing push plate is rotatably connected to the fixed frame. The bottom surface of the second end of the swing push plate contacts the upper surface of the pressing rod. The iron sheet is mounted on the second end of the swing push plate. The electromagnet is mounted on the rocker arm at a position opposite to the iron sheet. The pressing power supply is used to energize or de-energize the electromagnet.

[0017] In the above technical solution, the upper surface of the locking seat is provided with a positioning block, the positioning block is provided with a first connecting through hole, the bottom surface of the pressure rod is provided with a positioning groove, and the two side walls opposite to the positioning groove are provided with second connecting through holes. The positioning block can be inserted into the positioning groove. At this time, the first connecting through hole and the second connecting through hole are coaxially distributed. The pressure rod and the locking seat are fixed by the locking member cooperating with the first connecting through hole and the second connecting through hole.

[0018] In the above technical solution, the clamping mechanism further includes a base, two clamping plates and a clamping drive component. The base is mounted on the adjustment mechanism, and the two clamping plates are spaced apart on the base. A space is formed between the two clamping plates for the movable end of the board to be tested to be placed. The clamping drive component can drive the two clamping plates to move closer to each other or further away from each other, thereby clamping or releasing the movable end of the board to be tested.

[0019] In the above technical solution, a first sliding groove is provided on the crank rod along its length direction, a first sliding block is slidably disposed in the first sliding groove, and a first threaded locking member is provided on the crank rod to lock or unlock the first sliding block in the first sliding groove. The connection point between the first end of the connecting rod and the crank rod is located on the first sliding block. A second sliding groove is provided on the second end of the connecting rod along its length direction, a second sliding block is slidably disposed in the second sliding groove, and a second threaded locking member is provided on the connecting rod to lock or unlock the second sliding block in the second sliding groove. The connection point between the second end of the connecting rod and the rocker arm is located on the second sliding block.

[0020] The beneficial effects of this invention are: 1. By setting a first positioning seat and a second positioning seat on the frame base, the first positioning seat has a first positioning hole for the lower end of the hinge end of the board under test to be inserted, and the second positioning hole on the bottom surface of the second positioning seat is for the upper end of the hinge end of the board under test to be inserted. The rotation center of the rocker arm is coaxially distributed with the first positioning hole, ensuring that the hinge center of the board under test automatically coincides with the rotation center of the rocker arm after installation. The second positioning seat is detachably mounted above the first positioning seat, facilitating the insertion and removal of the board under test. This positioning method eliminates the need for complex alignment adjustments; the hinge end of the board under test only needs to be inserted into the corresponding positioning hole to achieve precise positioning, resulting in high installation efficiency and good positioning accuracy.

[0021] 2. By setting an adjustment seat, rack, gear, and handwheel in the mounting slot of the rocker arm, the operator only needs to turn the handwheel to drive the adjustment seat to move along the length of the rocker arm, realizing continuous adjustment of the clamping mechanism position to adapt to test plates of different widths. Through the cooperation of the locking seat, locking block, and linkage transmission mechanism, the dual locking and unlocking operation of the sliding of the adjustment seat and the rotation of the gear is realized. This linkage design allows the operator to complete the release or restoration of the sliding lock of the adjustment seat and the rotation lock of the gear with only one operation by pressing down, which greatly simplifies the operation steps, improves the adjustment efficiency, and avoids the safety hazards caused by forgetting to lock a certain part.

[0022] 3. By setting a first sliding groove and a first sliding block on the crank arm, and a second sliding groove and a second sliding block on the connecting rod, the connection point between the crank arm and the connecting rod, as well as the connection point between the connecting rod and the rocker arm, can be adjusted independently. This allows for flexible adjustment of the rocker arm's swing amplitude according to testing needs, enabling stepless adjustment of the opening and closing angle of the test plate and adapting to the testing requirements of different vehicle models.

[0023] 4. The rotational motion of the power source is converted into the reciprocating swing of the rocker arm through the crank-rocker mechanism. The driving method is simple and reliable, and can provide sufficient output torque to drive large side panels or tailgates to reciprocate opening and closing motion. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional structural diagram of the test board of the present invention.

[0026] Figure 2 This is a top view of the test board of the present invention.

[0027] Figure 3 This is a schematic diagram of the front view structure of the test board of the present invention.

[0028] Figure 4 for Figure 3 Schematic diagram of the cross-section structure in the AA direction.

[0029] Figure 5 This is a three-dimensional structural diagram of the detection device of the present invention.

[0030] Figure 6 This is a schematic diagram of the connection structure of the rocker arm, crank arm, connecting rod, and power source in this invention.

[0031] Figure 7 This is a schematic diagram of the rocker arm, clamping mechanism, and adjustment mechanism in this invention.

[0032] Figure 8 This is a top view of the rocker arm in this invention.

[0033] Figure 9 for Figure 8 The schematic diagram of the cross-sectional structure in the BB direction shows the installation positions of the adjustment mechanism and the locking mechanism in the rocker arm.

[0034] Figure 10 for Figure 9 The enlarged schematic diagram at point C shows the structure and connection relationship between the adjustment mechanism and the locking mechanism.

[0035] Figure 11 for Figure 8 The schematic diagram of the cross-sectional structure in the DD direction shows the structure and connection relationship of the locking mechanism.

[0036] Figure 12 This is a three-dimensional structural diagram of the bottom of the adjusting seat in this invention.

[0037] Figure 13 This is a three-dimensional structural diagram of the locking mechanism in this invention, showing the structure of the positioning block, the first connecting through hole, and the second connecting through hole.

[0038] Figure 14 This is a three-dimensional structural diagram of the locking mechanism in this invention, showing the structure of the positioning slot and the second connecting through hole.

[0039] Figure 15 This is a schematic diagram of the adjustable length structure of the crank and connecting rod in the crank-rocker mechanism of the present invention.

[0040] The markings in the diagram are as follows: G. Test board; 1. Frame; 2. Frame base; 3. First positioning seat; 301. First positioning hole; 4. Second positioning seat; 401. Second positioning hole; 402. Insertion hole; 5. Rocker arm; 501. Shaft hole; 502. Mounting slot; 6. Clamping mechanism; 601. Base; 602. Clamping plate; 603. Clamping drive component; 7. Crank rod; 701. First sliding groove; 702. First sliding block; 703. First threaded locking component; 8. Connecting rod; 801. Second sliding groove; 802. Second sliding block; 803. Second threaded locking component; 9. Power source; 10. Adjustment mechanism; 101. Adjustment seat; 1011. Locking groove; 1 012. Guide through hole; 102. Rack; 103. Gear; 104. Handwheel; 11. Positioning pin; 12. Locking mechanism; 121. Locking seat; 122. Locking block; 123. Locking seat; 124. Locking gear assembly; 1211. Positioning block; 1212. First connecting through hole; 1511. Positioning slot; 1512. Second connecting through hole; 13. Positioning screw; 14. Limiting nut; 151. Pressure rod; 152. First reset elastic element; 153. Second reset elastic element; 16. Pressing element; 161. Fixing frame; 162. Swinging push plate; 163. Electromagnet; 164. Iron sheet; 165. Pressing power supply. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the invention. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0043] Example 1

[0044] This invention provides a fatigue strength testing device for the opening and closing of the side panel of a semi-trailer, including a frame 1, a frame base 2, a rocker arm 5, a crank arm 7, an adjustment mechanism 10, and a locking mechanism 12.

[0045] The frame 1 is fixedly installed on the ground of the test site to support and fix other components; the frame 1 is made of welded steel structure and has sufficient strength and rigidity to withstand the dynamic load generated during the test.

[0046] Please see Figures 1-5 The frame base 2 is mounted on the frame 1, and the frame base 2 is equipped with a positioning mechanism for mounting the hinge end of the test board G. Please refer to [link / reference]. Figure 5 The positioning mechanism includes a first positioning seat 3 and a second positioning seat 4. The first positioning seat 3 is fixedly installed on the frame seat 2, and a first positioning hole 301 is provided on the first positioning seat 3 for the lower end of the hinge end of the test board G to be inserted. The second positioning seat 4 is detachably disposed above the first positioning seat 3, and a second positioning hole 401 is provided on the bottom surface of the second positioning seat 4 for the upper end of the hinge end of the test board G to be inserted. The first positioning hole 301 and the second positioning hole 401 are coaxially distributed and together form the positioning reference of the hinge end of the test board G. When installing the test board G, the lower end of the hinge end of the test board G is first inserted into the first positioning hole 301, and then the second positioning seat 4 is installed above the first positioning seat 3 so that the upper end of the hinge end of the test board G is inserted into the second positioning hole 401, thereby completing the positioning of the hinge end of the test board G.

[0047] Please see Figures 1-5 The first end of the rocker arm 5 is rotatably connected to the frame 1, and the rotation center of the rocker arm 5 is coaxially distributed with the first positioning hole 301. The second end of the rocker arm 5 is provided with a clamping mechanism 6 for clamping the movable end of the test plate G. The rocker arm 5 is a long strip-shaped rod structure made of high-strength steel.

[0048] Please see Figures 1-5 The first end of the crank lever 7 is rotatably mounted on the frame 1, and the first end of the crank lever 7 is connected to the power source 9. The power source 9 can be a combination of a servo motor and a reducer to provide rotational driving force for the crank lever 7. The second end of the crank lever 7 is connected to the first end of the connecting rod 8, and the second end of the connecting rod 8 is connected to the rocker arm 5. The crank lever 7, the connecting rod 8, and the rocker arm 5 together form a crank-rocker arm 5 mechanism. When the power source 9 drives the crank lever 7 to rotate, the crank lever 7 drives the rocker arm 5 to swing back and forth around its rotation center through the connecting rod 8. The rocker arm 5 drives the test plate G to open and close back and forth around its hinge end through the clamping mechanism 6.

[0049] The adjustment mechanism 10 can adjust the position of the clamping mechanism 6 along the length of the rocker arm 5. The locking mechanism 12 is provided on the rocker arm 5 and can lock or unlock the current position of the clamping mechanism 6 on the rocker arm 5.

[0050] In this embodiment, the rotational motion of the power source 9 is converted into the reciprocating swing of the rocker arm 5 through the crank-rocker arm 5 mechanism, which is simple and reliable. The position of the clamping mechanism 6 on the rocker arm 5 can be adjusted by the adjustment mechanism 10, so that the clamping mechanism 6 can clamp the movable end of the test plate G of different widths, which improves the versatility of the equipment. The position of the clamping mechanism 6 after adjustment can be locked by the locking mechanism 12 to ensure that the clamping mechanism 6 will not be displaced during the test.

[0051] Example 2

[0052] Based on Example 1, this embodiment further optimizes the structure of the detection device.

[0053] Please see Figure 4 An installation space is provided between the first positioning seat 3 and the frame 1 for the first end of the rocker arm 5 to enter. The first end of the rocker arm 5 is provided with a shaft hole 501. A detachable positioning post 11 is provided on the frame 1. The positioning post 11 can be inserted into the shaft hole 501 from the bottom of the frame 1. For example, the frame 1 is provided with a threaded hole at the position of the first end of the rocker arm 5, and the lower end of the positioning post 11 is provided with an external thread that engages with the threaded hole. The upper end of the positioning post 11 is smooth, and the upper end of the positioning post 11 is inserted into the shaft hole 501, so that the first end of the rocker arm 5 can rotate with the positioning post 11 as the fulcrum, thereby realizing the rotational connection between the rocker arm 5 and the frame 1. When it is necessary to disassemble the rocker arm 5, simply unscrew the positioning post 11 from below the frame 1 to remove the rocker arm 5 from the frame 1. This structure makes the installation and disassembly of the rocker arm 5 more convenient, and facilitates the maintenance of the equipment and the replacement of parts.

[0054] Please see Figure 4 and Figure 5 The frame base 2 is provided with a positioning screw 13, and the second positioning base 4 is provided with a hole 402. The diameter of the hole 402 is larger than the diameter of the positioning screw 13. The second positioning base 4 is sleeved on the outside of the positioning screw 13 through the hole 402. The positioning screw 13 is provided with a limiting nut 14 to restrict the second positioning base 4 from moving along the axial direction of the positioning screw 13. The limiting nut 14 is threadedly connected to the positioning screw 13. When installing the second positioning seat 4, align the insertion hole 402 of the second positioning seat 4 with the positioning screw 13 and insert it. Then, screw the limiting nut 14 into the positioning screw 13 and tighten it. This will fix the second positioning seat 4 above the first positioning seat 3. Since the diameter of the insertion hole 402 is larger than the diameter of the positioning screw 13, the second positioning seat 4 can be adjusted horizontally during installation. Please refer to [link / reference]. Figure 5When installing the test board G, the second positioning seat 4 can be rotated at a certain angle so that the test board G can be installed on the first positioning seat 3 from top to bottom. After the lower end of the hinge end of the test board G is inserted into the first positioning hole 301, the second positioning seat 4 is rotated back so that the upper end of the hinge end of the test board G is inserted into the second positioning hole 401. Then, the limit nut 14 is tightened to press the second positioning seat 4 onto the frame seat 2, restricting the movement or rotation of the second positioning seat 4. At this time, there is a gap between the bottom surface of the second positioning seat 4 and the test board G, which will not affect the rotation of the test board G. When it is necessary to disassemble the second positioning seat 4, simply loosen the limit nut 14 to remove the second positioning seat 4 from the positioning screw 13.

[0055] In this embodiment, the rotation center of the rocker arm 5 is coaxially distributed with the first positioning hole 301, ensuring that the hinge center of the test board G coincides with the rotation center of the rocker arm 5 after installation, so that the test board G can rotate around its own hinge axis when the rocker arm 5 swings, simulating the real opening and closing conditions; the matching structure of the positioning screw 13 and the limiting nut 14 makes the installation and disassembly of the second positioning seat 4 simple, while the limiting nut 14 can ensure the stability of the second positioning seat 4 during the test.

[0056] Example 3

[0057] Based on Embodiment 1 and / or Embodiment 2, this embodiment also discloses a structure of the adjustment mechanism 10.

[0058] In this embodiment, the second end of the rocker arm 5 is provided with a mounting groove 502, and the adjustment mechanism 10 includes an adjustment seat 101, a rack 102, a gear 103 and a handwheel 104; Please see Figures 7-10 The adjusting seat 101 is slidably disposed in the mounting groove 502 along the length direction of the rocker arm 5. The clamping mechanism 6 is disposed on the adjusting seat 101. The adjusting seat 101 and the mounting groove 502 can adopt a sliding rail and sliding groove matching structure to ensure the smoothness and guiding accuracy of the adjusting seat 101 when sliding. Please see Figure 10 and Figure 12 The rack 102 is disposed at the bottom of the adjusting seat 101 along the sliding direction of the adjusting seat 101. The rack 102 and the adjusting seat 101 can be integrally formed or fixedly connected by fasteners. Please see Figure 10 The gear 103 is rotatably disposed in the mounting groove 502. The gear 103 meshes with the rack 102. The rotation axis of the gear 103 is perpendicular to the sliding direction of the adjusting seat 101. When the gear 103 rotates, the meshing transmission between the gear 103 and the rack 102 can drive the rack 102 to move along the length direction of the rocker arm 5, thereby driving the adjusting seat 101 and the clamping mechanism 6 disposed on the adjusting seat 101 to move synchronously. Please see Figure 7 The handwheel 104 is located outside the rocker arm 5. The handwheel 104 is coaxially and fixedly connected to the gear 103. When the operator rotates the handwheel 104, the handwheel 104 drives the gear 103 to rotate, which in turn drives the adjustment seat 101 to move along the length of the rocker arm 5, thereby realizing the continuous adjustment of the position of the clamping mechanism 6. In this embodiment, the position of the clamping mechanism 6 is adjusted through the gear 103 and rack 102 transmission mechanism, which provides smooth transmission and high adjustment accuracy. The handwheel 104 is located outside the rocker arm 5, making it easy for operators to operate. This adjustment method can adapt to the testing requirements of test plates G of different widths, thus improving the versatility of the equipment.

[0059] Example 4

[0060] Based on Embodiment 3, this embodiment also discloses a structure of the locking mechanism 12.

[0061] In this embodiment, please refer to Figure 12 The bottom surface of the adjustment seat 101 has multiple locking slots 1011 spaced apart along the length of the rocker arm 5 on both sides. The locking mechanism 12 includes a locking seat 121, a locking seat 123 and a linkage transmission mechanism. Please see Figure 10 , Figure 11 as well as Figure 13 The locking seat 121 is disposed in the mounting groove 502 in a direction perpendicular to the sliding direction of the adjusting seat 101. Multiple locking blocks 122 are provided at intervals on both sides of the locking seat 121 along the length direction of the rocker arm 5. The number of locking blocks 122 is less than the number of locking grooves 1011. When the locking seat 121 moves toward the adjusting seat 101, the multiple locking blocks 122 can be inserted into the corresponding multiple locking grooves 1011 at the same time, thereby restricting the sliding of the adjusting seat 101 along the length direction of the rocker arm 5. When the locking seat 121 moves away from the adjusting seat 101, the multiple locking blocks 122 can be disengaged from the corresponding multiple locking grooves 1011 at the same time, thereby releasing the restriction on the sliding of the adjusting seat 101. Please see Figure 10 and Figure 13 The locking seat 123 is rotatably disposed in the mounting groove 502 at its middle part. A locking tooth assembly 124 is provided at one end of the locking seat 123 near the gear 103. When the locking seat 123 swings toward the gear 103, the locking tooth assembly 124 can mesh with the gear 103, thereby restricting the rotation of the gear 103. When the locking seat 123 swings away from the gear 103, the locking tooth assembly 124 separates from the gear 103, thereby releasing the restriction on the rotation of the gear 103. The linkage transmission mechanism can drive the locking seat 123 to swing towards the gear 103 while driving the locking seat 121 to move closer to the adjusting seat 101; the linkage transmission mechanism can also drive the locking seat 123 to swing away from the gear 103 while driving the locking seat 121 to move away from the adjusting seat 101. Please refer to the details. Figures 10-12 The adjusting seat 101 is provided with a guide through hole 1012 along the length direction of the rocker arm 5. The end of the locking seat 123 away from the locking tooth group 124 is located below the locking seat 121. The linkage transmission mechanism includes a pressure rod 151, a first reset elastic element 152, a second reset elastic element 153 and a lower pressure element 16. Please see Figure 10 The lower end of the pressure rod 151 is detachably mounted on the locking seat 121, and the upper end of the pressure rod 151 extends through the guide hole 1012 to the top of the adjusting seat 101. The guide hole 1012 is set along the length direction of the rocker arm 5, so that while the pressure rod 151 moves up and down with the locking seat 121, it can move relative to the rocker arm 5 in the guide hole 1012 along the length direction of the rocker arm 5 without interfering with the sliding of the adjusting seat 101. Please see Figure 10 The first reset elastic element 152 is disposed on the bottom surface of the mounting groove 502. The upper end of the first reset elastic element 152 is in contact with the bottom surface of the locking seat 121. The first reset elastic element 152 can be a compression spring, which always applies an upward elastic force to the locking seat 121. Please see Figure 10 The second reset elastic element 153 is disposed on the bottom surface of the mounting groove 502. The upper end of the second reset elastic element 153 is in contact with the bottom surface of the locking seat 123 away from the locking tooth group 124. The second reset elastic element 153 can be a compression spring, which always applies an upward elastic force to the end of the locking seat 123 away from the locking tooth group 124. The pressing member 16 is mounted on the rocker arm 5 and is located above the pressing rod 151. The pressing member 16 can press the pressing rod 151 downward, causing the locking seat 121 to move downward away from the adjusting seat 101 and compress the first reset elastic member 152. During the downward movement of the locking seat 121, the locking seat 121 presses down the end of the locking seat 123 away from the locking gear group 124 and compresses the second reset elastic member 153, thereby causing the locking block 122 to exit the locking groove 1011 and simultaneously driving the locking gear group 124 away from the gear 103. In this embodiment, the locking seat 121 and the locking seat 123 cooperate to achieve dual locking of the sliding of the adjusting seat 101 and the rotation of the gear 103. When the locking seat 121 moves downward, the locking block 122 exits from the locking groove 1011 to release the restriction on the sliding of the adjusting seat 101. At the same time, the locking gear group 124 separates from the gear 103 to release the restriction on the rotation of the gear 103. When the locking seat 121 returns to its original position, the locking block 122 re-inserts into the locking groove 1011 to restrict the sliding of the adjusting seat 101. At the same time, the locking gear group 124 re-meshes with the gear 103 to restrict the rotation of the gear 103. The two locking and unlocking actions are performed synchronously through the linkage transmission mechanism. The operator only needs to control the pressing part 16 to complete the switching between locking and unlocking. The operation is simple and efficient.

[0062] Example 5

[0063] Based on Example 4, this embodiment also discloses a structure of the pressing member 16.

[0064] In this embodiment, the pressing component 16 includes a fixed frame 161, a swing push plate 162, an electromagnet 163, an iron sheet 164, and a pressing power supply 165.

[0065] Please see Figure 8 and Figure 11 The fixed frame 161 is mounted on the rocker arm 5. The first end of the swing push plate 162 is rotatably connected to the fixed frame 161. The bottom surface of the second end of the swing push plate 162 is in contact with the upper surface of the pressure rod 151. The iron plate 164 is mounted on the second end of the swing push plate 162. The electromagnet 163 is mounted on the rocker arm 5 at a position opposite to the iron plate 164. The downward power supply 165 is used to energize or de-energize the electromagnet 163. When the current power supply 165 energizes the electromagnet 163, the electromagnet 163 generates magnetic force to attract the iron piece 164, causing the second end of the swing push plate 162 to swing downward. The bottom surface of the second end of the swing push plate 162 presses against the upper end of the pressure rod 151, causing the pressure rod 151 to move downward. When the current power supply 165 de-energizes the electromagnet 163, the electromagnet 163 loses its magnetic force. Under the elastic force of the first reset elastic element 152 and the second reset elastic element 153, the pressure rod 151 moves upward to reset, pushing the second end of the swing push plate 162 to swing upward to reset. Please see Figure 13 The upper surface of the locking base 121 is provided with a positioning block 1211, and the positioning block 1211 is provided with a first connecting through hole 1212; please refer to Figure 14The bottom surface of the pressure rod 151 is provided with a positioning groove 1511. Each of the two opposite sidewalls of the positioning groove 1511 is provided with a second connecting through hole 1512. The positioning block 1211 can be inserted into the positioning groove 1511. At this time, the first connecting through hole 1212 and the second connecting through hole 1512 are coaxially distributed. The pressure rod 151 is fixed to the locking seat 121 by a locking member cooperating with the first connecting through hole 1212 and the second connecting through hole 1512. For example, the locking member can be a locking pin or a screw and nut. The locking member passes through both the first connecting through hole 1212 and the second connecting through hole 1512, preventing the positioning block 1211 from exiting the positioning groove 1511, thereby fixing the pressure rod 151 to the locking seat 121. In this embodiment, the lower pressure member 16 is electrically controlled by the electromagnet 163 driving the swing push plate 162 to swing, which facilitates integration with the control system and realizes automated locking and unlocking operations. The cooperation structure between the positioning block 1211 and the positioning slot 1511 realizes the quick positioning and detachable connection between the pressure rod 151 and the locking seat 121, which facilitates the installation, disassembly and maintenance of the pressure rod 151. At the same time, the detachable connection between the pressure rod 151 and the locking seat 121 also facilitates the disassembly and assembly of the adjusting seat 101 and the rocker arm 5. When it is necessary to install or remove the adjusting seat 101, first separate the pressure rod 151 from the locking seat 121, and then use a tool to press the locking seat 121 down, so that the adjusting seat 101 can be installed into the mounting slot 502 or taken out of the mounting slot 502.

[0066] Example 6

[0067] Based on Embodiment 1, this embodiment also discloses a structure of the clamping mechanism 6.

[0068] In this embodiment, the clamping mechanism 6 includes a base 601, two clamping plates 602, and a clamping drive component 603.

[0069] Please see Figure 6 and Figure 7 The base 601 is set on the adjustment mechanism 10. Specifically, the base 601 is fixedly installed on the adjustment seat 101 and moves together with the adjustment seat 101. Two clamping plates 602 are spaced apart on the base 601, and a space is formed between the two clamping plates 602 for the movable end of the test plate G to be inserted. The two clamping plates 602 are arranged opposite to each other, and the distance between them is adjustable. The clamping drive 603 can drive the two clamping plates 602 to move closer or further apart, thereby clamping or releasing the movable end of the test plate G. The clamping drive 603 can adopt a screw mechanism. For example, a screw with opposite directions of rotation can be set on the base 601, and a threaded sleeve adapted to the threads at both ends of the screw can be set on the two clamping plates 602. In this way, rotating the screw can drive the two clamping plates 602 to move towards or away from each other. When clamping the test board G, the movable end of the test board G is placed in the space between the two clamping plates 602. Then, the clamping drive 603 drives the two clamping plates 602 to move closer to each other and clamp the movable end of the test board G. After the test is completed, the clamping drive 603 drives the two clamping plates 602 to move away from each other and release the movable end of the test board G. In this embodiment, the clamping mechanism 6 has a simple structure and is easy to operate. It can reliably clamp the movable end of the test board G, ensuring a stable connection between the test board G and the rocker arm 5 during the test.

[0070] Example 7

[0071] Based on Example 1, this embodiment further optimizes the structure of the crank-rocker 5 mechanism.

[0072] In this embodiment, please refer to Figure 15 A first sliding groove 701 is provided on the crank lever 7 along the length direction. A first sliding block 702 is slidably disposed in the first sliding groove 701. A first threaded locking member 703 is provided on the crank lever 7 to lock or unlock the first sliding block 702 in the first sliding groove 701. The connection point between the first end of the connecting rod 8 and the crank lever 7 is located on the first sliding block 702. The second end of the connecting rod 8 is provided with a second sliding groove 801 along the length direction. A second sliding block 802 is slidably disposed in the second sliding groove 801. A second threaded locking member 803 is provided on the connecting rod 8 to lock or unlock the second sliding block 802 in the second sliding groove 801. The connection point between the second end of the connecting rod 8 and the rocker 5 is located on the second sliding block 802. When it is necessary to adjust the swing amplitude of the rocker arm 5, the operator can first loosen the first threaded locking member 703, so that the first sliding block 702 can slide along the first sliding groove 701, thereby changing the position of the connection point between the crank rod 7 and the connecting rod 8, that is, changing the effective length of the crank; at the same time, the operator can loosen the second threaded locking member 803, so that the second sliding block 802 can slide along the second sliding groove 801, thereby changing the position of the connection point between the connecting rod 8 and the rocker arm 5, that is, changing the effective length of the connecting rod 8; after the adjustment is completed, tighten the first threaded locking member 703 and the second threaded locking member 803 to lock the first sliding block 702 and the second sliding block 802 in their respective positions; In this embodiment, the effective length of the crank and the effective length of the connecting rod 8 are independently adjusted by the cooperation of the first sliding groove 701 and the first sliding block 702, as well as the cooperation of the second sliding groove 801 and the second sliding block 802. This allows for flexible adjustment of the swing amplitude of the rocker arm 5 according to test requirements, enabling stepless adjustment of the opening and closing angle of the test plate G to adapt to the test requirements of different vehicle models.

[0073] Example 8

[0074] This embodiment discloses an operating method suitable for the aforementioned detection device, as follows: First, install the test board G. Insert the lower end of the hinge end of the test board G into the first positioning hole 301 on the first positioning seat 3. Then, the second positioning seat 4 is sleeved on the positioning screw 13 through the insertion hole 402, so that the upper end of the hinge end of the test board G is inserted into the second positioning hole 401 on the bottom surface of the second positioning seat 4. Tighten the limit nut 14 to fix the second positioning seat 4. At this time, the hinge center of the test board G and the rotation center of the rocker arm 5 automatically coincide. Then, adjust the position of the clamping mechanism 6 according to the width of the test plate G. Power is supplied to the electromagnet 163 by pressing down the power supply 165. The electromagnet 163 attracts the iron plate 164, causing the second end of the swing push plate 162 to swing downward. Pressing the pressure rod 151 causes the locking seat 121 to move downward, driving the locking block 122 to exit from the locking groove 1011. At the same time, it causes the locking gear assembly 124 to separate from the gear 103. The operator turns the handwheel 104, which drives the gear 103 to rotate. The gear 103 rotates through the rack 10 2. Drive the adjustment seat 101 to slide along the length of the rocker arm 5 to adjust the clamping mechanism 6 to a position that can clamp the movable end of the test plate G. After the adjustment is completed, press down the power supply 165 to cut off the power to the electromagnet 163. The first reset elastic element 152 pushes the locking seat 121 to move upward and reset. The locking block 122 is inserted into the locking groove 1011 to restrict the sliding of the adjustment seat 101. At the same time, the second reset elastic element 153 pushes the locking seat 123 to reset. The locking gear group 124 re-meshes with the gear 103 to restrict the rotation of the gear 103. Next, the movable end of the test board G is placed between the two clamping plates 602 of the clamping mechanism 6, and the two clamping plates 602 are driven to move closer to each other by the clamping drive 603 to clamp the movable end of the test board G. Next, adjust the crank-rocker 5 mechanism according to the opening and closing angle required for the test. Loosen the first threaded locking part 703, slide the first sliding block 702 along the first sliding groove 701, and adjust the position of the connection point between the crank rod 7 and the connecting rod 8. Loosen the second threaded locking part 803, slide the second sliding block 802 along the second sliding groove 801, and adjust the position of the connection point between the connecting rod 8 and the rocker 5. After the adjustment is completed, tighten the first threaded locking part 703 and the second threaded locking part 803. Finally, power source 9 is started, which drives crank 7 to rotate. Crank 7 drives rocker arm 5 to swing back and forth around its rotation center through connecting rod 8. Rocker arm 5 drives the test plate G to open and close back and forth around its hinge end through clamping mechanism 6 to perform fatigue strength test.

[0075] During the test, parameters such as the output torque of the power source 9 and the swing angle of the rocker arm 5 can be monitored in real time. When the hinge or lock of the test board G suffers fatigue damage, these parameters will change accordingly, and the fatigue life of the test board G can be determined based on this.

[0076] The embodiments of the present invention have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A device for testing the fatigue strength of the opening and closing of the side panels of a semi-trailer, characterized in that, include: Rack (1); A frame base (2) is provided with a positioning mechanism for mounting the hinge end of the test board (G). The positioning mechanism includes a first positioning base (3) and a second positioning base (4). The first positioning base (3) is provided with a first positioning hole (301) for the lower end of the hinge end of the test board (G) to be inserted. The second positioning base (4) is detachably disposed above the first positioning base (3). The bottom surface of the second positioning base (4) is provided with a second positioning hole (401) for the upper end of the hinge end of the test board (G) to be inserted. A rocker arm (5) is provided. The first end of the rocker arm (5) is rotatably connected to the frame (1). The rotation center of the rocker arm (5) is coaxially distributed with the first positioning hole (301). The second end of the rocker arm (5) is provided with a clamping mechanism (6) for clamping the movable end of the test plate (G). A crank rod (7) is provided, the first end of which is rotatably mounted on the frame (1). The first end of the crank rod (7) is connected to a power source (9). The second end of the crank rod (7) is connected to the first end of a connecting rod (8). The second end of the connecting rod (8) is connected to a rocker arm (5). The crank rod (7), the connecting rod (8), and the rocker arm (5) form a crank-rocker arm (5) mechanism. An adjustment mechanism (10) is provided, which can adjust the position of the clamping mechanism (6) along the length direction of the rocker arm (5); A locking mechanism (12) is provided on the rocker arm (5), which can lock or unlock the clamping mechanism (6) at its current position on the rocker arm (5).

2. The fatigue strength testing device for the opening and closing of the side panel of a semi-trailer according to claim 1, characterized in that: A first installation space is provided between the first positioning seat (3) and the frame (1) for the first end of the rocker arm (5) to enter. The first end of the rocker arm (5) is provided with a shaft hole (501). A detachable positioning post (11) is provided on the frame (1). The positioning post (11) can be inserted into the shaft hole (501) from the bottom of the frame (1).

3. The fatigue strength testing device for the opening and closing of the side panel of a semi-trailer according to claim 1, characterized in that: The frame base (2) is provided with a positioning screw (13), and the second positioning base (4) is provided with a socket (402). The second positioning base (4) is sleeved on the outside of the positioning screw (13) through the socket (402). The positioning screw (13) is provided with a limiting nut (14) to restrict the second positioning base (4) from moving axially along the positioning screw (13).

4. The fatigue strength testing device for the opening and closing of the side panel of a semi-trailer according to claim 1, characterized in that: The rocker arm (5) has a mounting groove (502) at its second end, and the adjustment mechanism (10) includes: An adjusting seat (101) is slidably disposed in the mounting groove (502) along the length direction of the rocker arm (5), and the clamping mechanism (6) is disposed on the adjusting seat (101); A rack (102) is disposed at the bottom of the adjusting seat (101) along the sliding direction of the adjusting seat (101); A gear (103) is rotatably disposed in the mounting groove (502). The gear (103) meshes with the rack (102). When the gear (103) rotates, it can drive the rack (102) to move along the length direction of the rocker arm (5). One end of the drive shaft of the gear (103) extends to the outside of the rocker arm (5) and a handwheel (104) is provided at the end.

5. The fatigue strength testing device for the opening and closing of the side panel of a semi-trailer according to claim 4, characterized in that: The bottom surface of the adjusting seat (101) has multiple locking slots (1011) spaced apart along the length of the rocker arm (5) on both sides. The locking mechanism (12) includes: A locking seat (121) is disposed in the mounting groove (502) in a direction perpendicular to the sliding direction of the adjusting seat (101). Multiple locking blocks (122) are spaced apart on both sides of the locking seat (121) along the length of the rocker arm (5). The number of locking blocks (122) is less than the number of locking slots (1011). When the locking seat (121) moves towards the adjusting seat (101), the multiple locking blocks (122) can simultaneously insert into the corresponding multiple locking slots (1011), thereby restricting the sliding of the adjusting seat (101). When the locking seat (121) moves away from the adjusting seat (101), the multiple locking blocks (122) can simultaneously exit the corresponding multiple locking slots (1011), thereby releasing the sliding restriction on the adjusting seat (101). A locking seat (123) is rotatably disposed in the mounting groove (502) at its center. A locking tooth assembly (124) is provided at one end of the locking seat (123) near the gear (103). When the locking seat (123) swings toward the gear (103), the locking tooth assembly (124) can mesh with the gear (103), thereby restricting the rotation of the gear (103). When the locking seat (123) swings away from the gear (103), the locking tooth assembly (124) separates from the gear (103), thereby releasing the restriction on the rotation of the gear (103). The linkage transmission mechanism can drive the locking seat (121) to move closer to the adjusting seat (101) while simultaneously driving the locking seat (123) to swing closer to the gear (103); the linkage transmission mechanism can also drive the locking seat (121) to move away from the adjusting seat (101) while simultaneously driving the locking seat (123) to swing away from the gear (103).

6. The fatigue strength testing device for the opening and closing of the side panel of a semi-trailer according to claim 5, characterized in that: The adjusting seat (101) is provided with a guide hole (1012) along the length direction of the rocker arm (5), and the end of the locking seat (123) away from the locking tooth assembly (124) is located below the locking seat (121). The linkage transmission mechanism includes: A pressure rod (151) is provided at its lower end on the locking seat (121), and at its upper end, it extends through the guide hole (1012) to the top of the adjusting seat (101). The first reset elastic element (152) is disposed on the bottom surface of the mounting groove (502), and the upper end of the first reset elastic element (152) is in contact with the bottom surface of the locking seat (121). The second reset elastic element (153) is disposed on the bottom surface of the mounting groove (502), and the upper end of the second reset elastic element (153) contacts the bottom surface of the locking seat (123) away from the locking tooth assembly (124). The pressing member (16) is disposed on the rocker arm (5) and is located above the pressing rod (151). The pressing member (16) can press the pressing rod (151) downward, causing the locking seat (121) to move downward away from the adjusting seat (101) and compress the first reset elastic member (152). During this process, the locking seat (121) presses the end of the locking seat (123) away from the locking gear group (124) downward and compresses the second reset elastic member (153), thereby causing the locking block (122) to exit the locking groove (1011) and simultaneously driving the locking gear group (124) away from the gear (103).

7. The fatigue strength testing device for the opening and closing of the side panel of a semi-trailer according to claim 6, characterized in that: The pressing component (16) includes a fixed frame (161), a swing push plate (162), an electromagnet (163), an iron sheet (164), and a pressing power supply (165). The fixed frame (161) is mounted on the rocker arm (5). The first end of the swing push plate (162) is rotatably connected to the fixed frame (161). The bottom surface of the second end of the swing push plate (162) is in contact with the upper surface of the pressing rod (151). The iron sheet (164) is mounted on the second end of the swing push plate (162). The electromagnet (163) is mounted on the rocker arm (5) at a position opposite to the iron sheet (164). The pressing power supply (165) is used to energize or de-energize the electromagnet (163).

8. The fatigue strength testing device for the opening and closing of the side panel of a semi-trailer according to claim 6, characterized in that: The upper surface of the locking seat (121) is provided with a positioning block (1211), the positioning block (1211) is provided with a first connecting through hole (1212), the bottom surface of the pressure rod (151) is provided with a positioning groove (1511), and the two opposite side walls of the positioning groove (1511) are provided with second connecting through holes (1512). The positioning block (1211) can be inserted into the positioning groove (1511). At this time, the first connecting through hole (1212) and the second connecting through hole (1512) are coaxially distributed. The pressure rod (151) and the locking seat (121) are fixed by the locking member cooperating with the first connecting through hole (1212) and the second connecting through hole (1512).

9. The fatigue strength testing device for the opening and closing of the side panel of a semi-trailer according to claim 1, characterized in that: The clamping mechanism (6) includes a base (601), two clamping plates (602), and a clamping drive (603). The base (601) is mounted on the adjusting mechanism (10). The two clamping plates (602) are spaced apart on the base (601). A space is formed between the two clamping plates (602) for the movable end of the test plate (G) to be placed. The clamping drive (603) can drive the two clamping plates (602) to move closer to each other or further away from each other, thereby clamping or releasing the movable end of the test plate (G).

10. The fatigue strength testing device for the opening and closing of the side panel of a semi-trailer according to claim 1, characterized in that: The crank (7) is provided with a first sliding groove (701) along its length direction, and a first sliding block (702) is slidably disposed in the first sliding groove (701). The crank (7) is provided with a first threaded locking member (703) for locking or unlocking the first sliding block (702) in the first sliding groove (701). The connection point between the first end of the connecting rod (8) and the crank (7) is located on the first sliding block (702). The second end of the connecting rod (8) is provided with a second sliding groove (801) along its length direction, and a second sliding block (802) is slidably disposed in the second sliding groove (801). The connecting rod (8) is provided with a second threaded locking member (803) for locking or unlocking the second sliding block (802) in the second sliding groove (801). The connection point between the second end of the connecting rod (8) and the rocker arm (5) is located on the second sliding block (802).

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