Chain tension testing equipment

Abstract

The utility model relates to the technical field of chain testing, and particularly discloses chain tension testing equipment which comprises a driving motor assembly, a rotating device, a tension device and a protection mechanism, the rotating device is installed on an output shaft of the driving motor assembly, and the driving motor assembly is used for driving the rotating device to move; the tension device is installed at the end, away from the driving motor assembly, of the rotating device and rotationally matched with the chain. The protection mechanism is detachably installed on the peripheral side of the tension device and comprises a protection shell, and a sliding hole is formed in the protection shell. The chain tension test device has the effect of preventing the broken chain from splashing when the tension test is carried out on the chain.

Description

Technical Field

[0001] This application relates to the technical field of chain testing, and in particular to a chain tensile testing device. Background Technology

[0002] Chains, as a key transmission component, are widely used in many fields such as machinery manufacturing, machine tool manufacturing, automated production lines, and rail transportation. The quality and performance of chains directly affect the operational safety and stability of various equipment, and tensile strength is one of the important indicators for measuring chain quality.

[0003] In related technologies, chain tension testing equipment uses a drive motor to move a threaded rod, which in turn moves a movable plate to adjust the position of a rotating roller, thus tensioning the chain fitted onto the outer surfaces of the rotating and drive rollers. A drive cylinder, in conjunction with a tension testing mechanism, detects the chain's tensile limit. Simultaneously, a spring adjusts the chain tension to reduce testing errors. However, in actual testing, when the chain breaks due to excessive tension, the broken chain fragments may eject from the drive and rotating rollers. This equipment lacks adequate protective measures and cannot effectively prevent the broken chain fragments from flying out, posing a threat to the personal safety of the operators.

[0004] Regarding the aforementioned technologies, since the chain may break during chain tensile testing, and the flying debris from the broken chain poses a safety threat to operators and surrounding equipment, it is imperative to develop a chain tensile testing device that can prevent the flying debris from broken chains. Utility Model Content

[0005] In order to prevent broken chains from flying during chain tensile testing, this application provides a chain tensile testing device.

[0006] This application provides a chain tensile testing device, which adopts the following technical solution:

[0007] A chain tension testing device includes a drive motor assembly, a rotating device, a tension device, and a protective mechanism. The rotating device is mounted on the output shaft of the drive motor assembly and is used to drive the rotating device to move. The tension device is mounted on the end of the rotating device away from the drive motor assembly, and the tension device and the chain rotate in coordination. The protective mechanism is detachably mounted on the periphery of the tension device and includes a protective shell with a sliding hole inside the protective shell for the chain to slide.

[0008] By adopting the above technical solution, during operation, the chain to be tested is installed on the tension device. When the drive motor assembly is working, it drives the rotating device to rotate, thereby causing the tension device to rotate and the chain to move within the sliding hole. The chain and the tension device achieve rotational engagement. The chain is tightened to a certain extent by the tension device. If the chain does not break, it indicates that the chain is qualified; if the chain breaks, it is unqualified. The sliding groove is used to limit the position of the chain during the test to prevent the chain from deviating. The protective shell is also used to block the splashes generated when the chain breaks, ensuring the safety of operators and surrounding equipment.

[0009] Preferably, the drive motor assembly includes a first drive motor and a second drive motor, and the rotating device includes a first rotating mechanism and a second rotating mechanism. The first rotating mechanism is mounted on the output shaft of the first drive motor, and the first drive motor is used to drive the first rotating mechanism to move. The second rotating mechanism is mounted on the output shaft of the second drive motor, and the second drive motor is used to drive the second rotating mechanism to move. One end of the pulling device is mounted on the end of the first rotating mechanism away from the first drive motor, and the other end of the pulling device is mounted on the end of the second rotating mechanism away from the second drive motor.

[0010] By adopting the above technical solution, the first drive motor is used to drive the first rotating mechanism to move, the second drive motor is used to drive the second rotating mechanism to move, and the tensioning device is used to apply tension to the chain and detect whether the chain breaks.

[0011] Preferably, the first rotating mechanism includes a first gear and a second gear, the first gear is mounted on the output shaft of the first drive motor, the second gear is mounted on the tension device near the end of the first drive motor, and the second gear meshes with the first gear; the second rotating mechanism includes a third gear and a fourth gear, the third gear is mounted on the output shaft of the second drive motor, the fourth gear is mounted on the tension device near the end of the second drive motor, and the fourth gear meshes with the third gear.

[0012] By adopting the above technical solution, the first drive motor starts, driving the first gear to rotate, which in turn drives the second gear to rotate; the second drive motor starts, driving the third gear to rotate, which in turn drives the fourth gear to rotate.

[0013] Preferably, the pulling device includes a first pulling mechanism and a second pulling mechanism. The first pulling mechanism is installed at the end of the first rotating mechanism away from the first drive motor, and the first rotating mechanism drives the first pulling mechanism to move synchronously. The second pulling mechanism is installed at the end of the second rotating mechanism away from the second drive motor, and the second rotating mechanism drives the second pulling mechanism to move synchronously.

[0014] By adopting the above technical solution, the first tension mechanism is driven by the first rotation mechanism, and the second tension mechanism is driven by the second rotation mechanism. By controlling the rotation speed of the rotation mechanism, the magnitude of the tension applied to the chain can be flexibly adjusted.

[0015] Preferably, the first tension mechanism includes a first tension sprocket and a first rotating wheel. The first tension sprocket is mounted on the top of the second gear and is coaxially arranged with the second gear. The first rotating wheel is mounted on the end of the first gear away from the first drive motor and is coaxially arranged with the first gear. A first gap is provided between the first tension sprocket and the first rotating wheel for the chain to pass through.

[0016] By adopting the above technical solution, the first tension mechanism can transmit the power of the first rotation mechanism to the chain by using the coaxial installation of the first tension sprocket and the second gear, and the coaxial installation of the first rotating wheel and the first gear. The chain passes through the first gap to realize the tension output of the first tension mechanism on the chain.

[0017] Preferably, the second tension mechanism includes a second tension sprocket and a second rotating wheel. The second tension sprocket is mounted on the top of the fourth gear and is coaxially arranged with the fourth gear. The second rotating wheel is mounted on the top of the third gear and is coaxially arranged with the third gear. A second gap is provided between the second tension sprocket and the second rotating wheel for the chain to pass through.

[0018] By adopting the above technical solution, the chain is placed in the second gap between the second tension sprocket and the second rotating wheel, ensuring that one end of the chain meshes with the second tension sprocket; the second drive motor is started, driving the third gear to rotate, thereby causing the second rotating wheel to rotate counterclockwise, while the fourth gear drives the second tension sprocket to rotate clockwise, causing one end of the chain to enter the sliding hole; when one end of the chain slides to the first rotating wheel, the first drive motor is started, driving the first gear to rotate, causing the first rotating wheel to rotate counterclockwise, while the second gear drives the first tension sprocket to rotate clockwise, the first tension sprocket, the first rotating wheel, the second tension sprocket, and the second rotating wheel... The rotating wheel drives the chain to move within the sliding hole until one end of the chain slides out from the first gap between the first tension sprocket and the first rotating wheel and engages with the first tension sprocket. At this point, the second drive motor maintains its original torque. The first drive motor is then adjusted to a higher torque, and the first tension sprocket moves at a faster speed. The end of the chain engaged with the first tension sprocket follows the movement of the first tension sprocket, and the chain is tightened. When the tension on the chain reaches the set value, if the chain does not break, the chain is qualified; if the chain breaks, the chain is unqualified. Subsequently, the first and second drive motors stop working, completing the chain tension test.

[0019] Preferably, a first fixing plate is mounted on one end of the first drive motor near the first gear. The first fixing plate is provided with a first mounting hole and a first mounting groove, the first mounting groove and the first mounting hole are connected, the first gear is located in the first mounting hole, and the second gear is installed in the first mounting groove; a second fixing plate is mounted on one end of the second drive motor near the third gear. The second fixing plate is provided with a second mounting hole and a second mounting groove, the second mounting groove and the second mounting hole are connected, the third gear is located in the second mounting hole, and the fourth gear is installed in the second mounting groove.

[0020] By adopting the above technical solution, the first mounting groove and the first mounting hole respectively play a positioning and supporting role for the first gear and the second gear, ensuring the meshing between the first gear and the second gear; the second mounting groove and the second mounting hole respectively play a positioning and supporting role for the third gear and the fourth gear, ensuring the meshing between the third gear and the fourth gear.

[0021] Preferably, a fixing bracket is fixedly installed on the outer periphery of the first fixing plate and the outer periphery of the second fixing plate.

[0022] By adopting the above technical solutions, the fixing frame can enhance the stability of the entire equipment, making the equipment more stable during operation.

[0023] Preferably, the protective shell is detachably installed on the fixed frame at one end away from both the first drive motor and the second drive motor, and the protective shell surrounds the periphery of the first and second rotating wheels.

[0024] By adopting the above technical solution, the protective shell can block the flying parts when the chain breaks, preventing them from causing injury to operators and surrounding equipment, and providing safety protection for the chain tensile testing process.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. During operation, the chain to be tested is installed on the tension device. When the drive motor assembly is working, it drives the rotating device to rotate, thereby causing the tension device to rotate and the chain to move within the sliding hole. The chain and the tension device achieve rotational engagement. The chain is tightened to a certain extent by the tension device. If the chain does not break, it means the chain is qualified. If the chain breaks, it is unqualified. The sliding groove is used to limit the position of the chain during the test to prevent the chain from deviating. The protective shell is also used to block the splashes generated when the chain breaks, ensuring the safety of the operator and surrounding equipment.

[0027] Insert the chain into the second gap between the second tension sprocket and the second rotating wheel, ensuring that one end of the chain engages with the second tension sprocket. Start the second drive motor, which drives the third gear to rotate, causing the second rotating wheel to rotate counter-clockwise. Simultaneously, the fourth gear drives the second tension sprocket to rotate clockwise, causing one end of the chain to enter the sliding hole. When one end of the chain slides to the first rotating wheel, the first drive motor starts, driving the first gear to rotate, causing the first rotating wheel to rotate counter-clockwise. Simultaneously, the second gear drives the first tension sprocket to rotate clockwise. The first tension sprocket, the first rotating wheel, the second tension sprocket, and the second rotating wheel together move... The moving chain moves within the sliding hole until one end of the chain slides out from the first gap between the first tension sprocket and the first rotating wheel and engages with the first tension sprocket. At this point, the second drive motor maintains its original torque. The first drive motor is then adjusted to a higher torque, and the first tension sprocket moves at a faster speed. The end of the chain engaged with the first tension sprocket follows the movement of the first tension sprocket, and the chain is tightened. When the tension on the chain reaches the set value, if the chain does not break, the chain is qualified; if the chain breaks, the chain is unqualified. Subsequently, the first and second drive motors stop working, completing the chain tension test.

[0028] 2. The protective shell can block the flying parts when the chain breaks, preventing them from causing injury to operators and surrounding equipment, and providing safety protection during the chain tensile testing process. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this application;

[0030] Figure 2 This is a structural schematic diagram highlighting the rotating device and sliding hole in this application.

[0031] Reference numerals: 1. Drive motor assembly; 11. First drive motor; 12. Second drive motor; 2. Rotating device; 21. First rotating mechanism; 211. First gear; 212. Second gear; 22. Second rotating mechanism; 221. Third gear; 222. Fourth gear; 3. Pulling device; 31. First pulling mechanism; 311. First pulling sprocket; 312. First rotating wheel; 313. First gap; 32. Second pulling mechanism; 321. Second pulling sprocket; 322. Second rotating wheel; 323. Second gap; 4. Protective mechanism; 41. Protective shell; 42. Sliding hole; 5. First fixing plate; 51. First mounting hole; 52. First mounting groove; 6. Second fixing plate; 61. Second mounting hole; 62. Second mounting groove; 7. Fixing frame. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.

[0033] This application discloses a chain tensile testing device.

[0034] Reference Figure 1 and Figure 2 A chain tension testing device includes a drive motor assembly 1, a rotating device 2, a tension device 3, and a protective mechanism 4. The rotating device 2 is mounted on the output shaft of the drive motor assembly 1, and the drive motor assembly 1 is used to drive the rotating device 2 to move. The tension device 3 is mounted on the end of the rotating device 2 away from the drive motor assembly 1, and the tension device 3 and the chain rotate in coordination. The protective mechanism 4 is detachably mounted on the periphery of the tension device 3. The protective mechanism 4 includes a protective shell 41, and a sliding hole 42 is provided inside the protective shell 41.

[0035] During operation, the chain to be tested is installed on the tension device 3. When the drive motor assembly 1 is working, it drives the rotating device 2 to rotate, thereby causing the tension device 3 to rotate and the chain to move within the sliding hole 42. The chain and the tension device 3 achieve rotational engagement. The chain is tightened to a certain extent by the tension device 3. If the chain does not break, it means that the chain is qualified; if the chain breaks, it is unqualified. The sliding hole 42 is used to limit the position of the chain during the test to prevent the chain from deviating. The protective shell 41 is also used to block the splashes generated when the chain breaks, ensuring the safety of the operator and surrounding equipment. The detachable installation method facilitates the disassembly and assembly of the protective shell 41.

[0036] The drive motor assembly 1 includes a first drive motor 11 and a second drive motor 12. The rotating device 2 includes a first rotating mechanism 21 and a second rotating mechanism 22. The first rotating mechanism 21 is mounted on the output shaft of the first drive motor 11, and the first drive motor 11 drives the first rotating mechanism 21 to move. The second rotating mechanism 22 is mounted on the output shaft of the second drive motor 12, and the second drive motor 12 drives the second rotating mechanism 22 to move. One end of the tensioning device 3 is mounted on the end of the first rotating mechanism 21 away from the first drive motor 11, and the other end of the tensioning device 3 is mounted on the end of the second rotating mechanism 22 away from the second drive motor 12.

[0037] The first rotating mechanism 21 includes a first gear 211 and a second gear 212. The first gear 211 is mounted on the output shaft of the first drive motor 11, and the second gear 212 is mounted on the tension device 3 near the end of the first drive motor 11, and the second gear 212 meshes with the first gear 211. The second rotating mechanism 22 includes a third gear 221 and a fourth gear 222. The third gear 221 is mounted on the output shaft of the second drive motor 12, and the fourth gear 222 is mounted on the tension device 3 near the end of the second drive motor 11, and the fourth gear 222 meshes with the third gear 221.

[0038] The tension device 3 includes a first tension mechanism 31 and a second tension mechanism 32. The first tension mechanism 31 is installed at the end of the first rotating mechanism 21 away from the first drive motor 11, and the first rotating mechanism 21 drives the first tension mechanism 31 to move synchronously. The second tension mechanism 32 is installed at the end of the second rotating mechanism 22 away from the second drive motor 12, and the second rotating mechanism 22 drives the second tension mechanism 32 to move synchronously.

[0039] The first tension mechanism 31 includes a first tension sprocket 311 and a first rotating wheel 312. The first tension sprocket 311 is mounted on the top of the second gear 212 and is coaxially arranged with the second gear 212. The first rotating wheel 312 is mounted on the end of the first gear 211 away from the first drive motor 11 and is coaxially arranged with the first gear 211. A first gap 313 is provided between the first tension sprocket 311 and the first rotating wheel 312 for the chain to pass through.

[0040] The second tension mechanism 32 includes a second tension sprocket 321 and a second rotating wheel 322. The second tension sprocket 321 is mounted on the top of the fourth gear 222 and is coaxially arranged with the fourth gear 222. The second rotating wheel 322 is mounted on the top of the third gear 221 and is coaxially arranged with the third gear 221. A second gap 323 is provided between the second tension sprocket 321 and the second rotating wheel 322 for the chain to pass through.

[0041] When conducting a chain tension test, the chain is placed in the second gap 323 between the second tension sprocket 321 and the second rotating wheel 322, ensuring that one end of the chain is engaged with the second tension sprocket 321. The second drive motor 12 is started, which drives the third gear 221 to rotate. The third gear 221 drives the second rotating wheel 322 to rotate counterclockwise. At the same time, the third gear 221 and the fourth gear 222 are engaged, thereby driving the fourth gear 222 to rotate. The fourth gear 222 drives the second tension sprocket 321 to rotate clockwise. The second tension sprocket 321 and the second rotating wheel 322 drive one end of the chain into the sliding hole 42 and move along the sliding hole 42.

[0042] When one end of the chain slides to the first rotating wheel 312, the first drive motor 11 starts, driving the first gear 211 to rotate. The first gear 211 drives the first rotating wheel 312 to rotate counterclockwise. The first rotating wheel 312 and the second rotating wheel 322 rotate at the same speed. The first rotating wheel 312 drives one end of the chain to rotate along the sliding hole 42. At the same time, the first gear 211 and the second gear 212 mesh, thereby driving the second gear 212 to rotate. The second gear 212 drives the first tension sprocket 311 to rotate clockwise. The first tension sprocket 311 and the second tension sprocket 321 rotate at the same speed. The first tension sprocket 311 and the first rotating wheel 312 continue to drive one end of the chain to move until one end of the chain slides out of the first gap 313 along the sliding hole 42 and engages with the first tension sprocket 311.

[0043] At this time, the second drive motor 12 maintains its original torque, and the other end of the chain is engaged with the second tension sprocket 321. The first drive motor 11 is adjusted to a larger torque, and the first tension sprocket 311 moves at a faster speed. The end of the chain engaged with the first tension sprocket 311 moves with the first tension sprocket 311, and the chain is tightened. During the test, the protective mechanism 4 protects the test area throughout the process. When the tension on the chain reaches the set value, and the chain is stretched to a certain extent without breaking, the chain is qualified, and the first drive motor 11 and the second drive motor 12 stop working, completing the chain tension test. If the tension on the chain reaches the set value, and the chain is stretched to a certain extent and breaks, the chain is unqualified, and the first drive motor 11 and the second drive motor 12 stop working, completing the chain tension test.

[0044] A first fixing plate 5 is mounted on one end of the first drive motor 11 near the first gear 211. The first fixing plate 5 has a first mounting groove 52 and a first mounting hole 51, which are connected. The first gear 211 is located in the first mounting hole 51, and the second gear 212 is mounted in the first mounting groove 52. A second fixing plate 6 is mounted on one end of the second drive motor 12 near the third gear 221. The second fixing plate 6 has a second mounting groove 62 and a second mounting hole 61, which are connected. The third gear 221 is located in the second mounting hole 61, and the fourth gear 222 is mounted in the second mounting groove 62.

[0045] A fixing bracket 7 is fixedly installed on the outer periphery of the first fixing plate 5 and the outer periphery of the second fixing plate 6. The fixing bracket 7 is used to fix the first fixing plate 5 and the second fixing plate 6 together.

[0046] The protective shell 41 is detachably mounted on the fixed frame 7 at one end away from the first drive motor 11 and one end away from the second drive motor 12, and the protective shell 41 surrounds the first rotating wheel 312 and the second rotating wheel 322.

[0047] The implementation principle of this application embodiment is as follows: When conducting a chain tension test, the chain is installed at the second tension mechanism 32, ensuring that the chain meshes with the second tension sprocket 321. The second drive motor 12 and the first drive motor 11 are started sequentially. The second drive motor 12 drives the second tension sprocket 321 to rotate through the second rotation mechanism 22, causing one end of the chain to enter the sliding hole 42. When one end of the chain slides to the first rotation mechanism 21, the first drive motor 11 drives the first tension mechanism 31 to rotate through the first rotation mechanism 21 until one end of the chain slides out of the sliding hole 42 and is engaged with the first tension sprocket 311. At this time, the second drive motor 12 maintains its original torque; the first drive motor 11 is adjusted to a larger torque, and the first tension sprocket 311 moves at a faster speed. The end of the chain engaged with the first tension sprocket 311 follows the movement of the first tension sprocket 311, and the chain is tightened. The first tension mechanism 31 and the second tension mechanism 32 apply tension to both ends of the chain. During the test, the protective mechanism 4 protects the chain throughout the process. When the tension of the equipment reaches the set value or the chain breaks, the second drive motor 12 and the first drive motor 11 are stopped, and the chain is observed to see if it has broken, thus completing the chain tension test.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A chain tension testing apparatus, characterized by, The device includes a drive motor assembly (1), a rotating device (2), a tensioning device (3), and a protective mechanism (4). The rotating device (2) is mounted on the output shaft of the drive motor assembly (1), and the drive motor assembly (1) is used to drive the rotating device (2) to move. The tensioning device (3) is mounted on the end of the rotating device (2) away from the drive motor assembly (1), and the tensioning device (3) and the chain rotate in coordination. The protective mechanism (4) is detachably mounted on the periphery of the tensioning device (3). The protective mechanism (4) includes a protective shell (41), and the interior of the protective shell (41) has a sliding hole (42) for the chain to slide.

2. A chain tension testing apparatus according to claim 1, wherein The drive motor assembly (1) includes a first drive motor (11) and a second drive motor (12). The rotating device (2) includes a first rotating mechanism (21) and a second rotating mechanism (22). The first rotating mechanism (21) is mounted on the output shaft of the first drive motor (11), and the first drive motor (11) is used to drive the first rotating mechanism (21) to move. The second rotating mechanism (22) is mounted on the output shaft of the second drive motor (12), and the second drive motor (12) is used to drive the second rotating mechanism (22) to move. One end of the tension device (3) is mounted on the end of the first rotating mechanism (21) away from the first drive motor (11), and the other end of the tension device (3) is mounted on the end of the second rotating mechanism (22) away from the second drive motor (12).

3. A chain tension testing apparatus according to claim 2, wherein The first rotating mechanism (21) includes a first gear (211) and a second gear (212). The first gear (211) is mounted on the output shaft of the first drive motor (11), and the second gear (212) is mounted on the end of the tension device (3) near the first drive motor (11), and the second gear (212) meshes with the first gear (211). The second rotating mechanism (22) includes a third gear (221) and a fourth gear (222). The third gear (221) is mounted on the output shaft of the second drive motor (12), and the fourth gear (222) is mounted on the end of the tension device (3) near the second drive motor (12), and the fourth gear (222) meshes with the third gear (221).

4. A chain tension testing apparatus according to claim 3, wherein The pulling device (3) includes a first pulling mechanism (31) and a second pulling mechanism (32). The first pulling mechanism (31) is installed at the end of the first rotating mechanism (21) away from the first drive motor (11), and the first rotating mechanism (21) drives the first pulling mechanism (31) to move synchronously. The second pulling mechanism (32) is installed at the end of the second rotating mechanism (22) away from the second drive motor (12), and the second rotating mechanism (22) drives the second pulling mechanism (32) to move synchronously.

5. A chain tension testing apparatus according to claim 4, wherein The first tension mechanism (31) includes a first tension sprocket (311) and a first rotating wheel (312). The first tension sprocket (311) is mounted on the second gear (212) and is coaxial with the second gear (212). The first rotating wheel (312) is mounted on the end of the first gear (211) away from the first drive motor (11) and is coaxial with the first gear (211). A first gap (313) is provided between the first tension sprocket (311) and the first rotating wheel (312) for the chain to pass through.

6. A chain tension testing apparatus according to claim 5, wherein The second tension mechanism (32) includes a second tension sprocket (321) and a second rotating wheel (322). The second tension sprocket (321) is mounted on the fourth gear (222) and is coaxially arranged with the fourth gear (222). The second rotating wheel (322) is mounted on the top of the third gear (221) and is coaxially arranged with the third gear (221). A second gap (323) is provided between the second tension sprocket (321) and the second rotating wheel (322) for the chain to pass through.

7. A chain tension testing apparatus according to claim 6, wherein The first drive motor (11) is equipped with a first fixing plate (5) near the first gear (211). The first fixing plate (5) is provided with a first mounting groove (52) and a first mounting hole (51). The first mounting groove (52) and the first mounting hole (51) are connected. The first gear (211) is located in the first mounting hole (51). The second gear (212) is installed in the first mounting groove (52). The second drive motor (12) is equipped with a second fixing plate (6) near the third gear (221). The second fixing plate (6) is provided with a second mounting groove (62) and a second mounting hole (61). The second mounting groove (62) and the second mounting hole (61) are connected. The third gear (221) is located in the second mounting hole (61). The fourth gear (222) is installed in the second mounting groove (62).

8. A chain tension testing apparatus according to claim 7, wherein A fixing bracket (7) is fixedly installed on the outer periphery of the first fixing plate (5) and the outer periphery of the second fixing plate (6).

9. A chain tension testing apparatus according to claim 8, wherein The protective shell (41) is detachably mounted on the fixed frame (7) at one end away from the first drive motor (11) and the second drive motor (12), and the protective shell surrounds the first wheel (312) and the second wheel (322).

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