Tension detection structure

Abstract

The invention discloses a tension detection structure, and relates to the technical field of tension detection. The invention discloses a tension detection structure which is applied to a hydraulic riveting tool. The tension detection structure comprises a cylinder body part and a pipe body part which are connected, wherein the interior of the pipe body part is communicated with the interior of the cylinder body part; the cylinder body part is connected with a piston part in a sliding mode, the piston part divides the interior of the cylinder body part into a first cavity and a second cavity, and a first air hole communicated with the first cavity and a second air hole communicated with the second cavity are formed in the cylinder body part; the piston piece comprises a rod body extending into the pipe body piece, the rod body is attached to the pipe body piece, a storage cavity used for being communicated with the oil cavity is formed in the pipe body piece, and a detection piece used for detecting the pressure of oil in the storage cavity is installed on the pipe body piece. According to the method, the whole process of tension change when the rivet core is snapped can be accurately calculated.

Description

Technical Field

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

[0002] In the fastening and riveting of metal sheets and pipes, hydraulic riveting tools such as rivet guns are the core assembly tools. They use a power unit to drive a gripping structure to clamp the rivet core. Specifically, the power unit usually includes a piston disc. Inside the rivet gun, two oil chambers are formed on both sides of the piston disc. When oil is introduced into one of the oil chambers, the piston disc is pushed, which drives the gripping structure to grab the rivet core and pull it to gradually break it, thus completing the riveting. The actual tensile force value during the riveting process directly determines the tightness and reliability of the connected structure, and it is a key indicator for controlling the quality of the riveting process.

[0003] In existing technologies, tensile force detection for rivet guns is mostly simple auxiliary detection or there is no direct detection method. The mainstream approach is still to rely on the operator's experience to judge the riveting effect. A few rivet guns with matching detection structures only use a single sensor installed in the power unit or force-bearing component to indirectly calculate the tensile force value by converting the tensile force into an electrical signal or pressure signal. The tensile force needs to be transmitted through multiple stages before it can be collected by the sensor.

[0004] Traditional rivet guns, relying on operator experience to judge riveting effectiveness, struggle to ensure consistency across different operators and batches. They also lack the ability to monitor actual tensile force in real-time, making it difficult for operators to calculate the tensile force changes throughout the entire process from core stretching to breakage. This hinders the ability to determine if understretching leads to loosening or overstretching causes premature core breakage. Existing simple detection structures suffer from detection lag and low accuracy due to long force transmission paths. Furthermore, current technologies struggle to record and trace tensile data, failing to meet the core requirements of process quality control in industrial sectors with stringent connection strength requirements.

[0005] Therefore, how to accurately calculate the entire process of tensile force change when the nail core breaks is an urgent problem to be solved. Summary of the Invention

[0006] In order to accurately calculate the entire process of tensile force change when the nail core breaks, this application provides a tensile force detection structure.

[0007] The tensile testing structure provided in this application adopts the following technical solution: A tensile testing structure is applied to a riveting tool. The tensile testing structure includes a connected cylinder and a tubular component, the interior of which is in communication with the interior of the cylinder. A piston is slidably connected to the cylinder, the piston dividing the interior of the cylinder into a first chamber and a second chamber. The cylinder has a first vent hole communicating with the first chamber and a second vent hole communicating with the second chamber. The piston component includes a rod extending into the tube component and the rod being fitted to the tube component. The interior of the tube component is formed as a storage cavity for communicating with an oil chamber. A detection element for detecting the hydraulic pressure of the oil in the storage cavity is installed on the tube component. A tensile testing structure also includes a control module, with the testing component connected to the control module. The control module can control the riveting tool to work in response to the testing signal from the testing component.

[0008] By adopting the above technical solution, after connecting the storage chamber and the oil chamber and filling the storage chamber with oil, the piston can be moved by injecting air into the second or first vent. The movement of the piston can drive the rod to move, thereby pushing the oil into the oil chamber of the rivet gun. At this time, the rivet gun will perform the action of stretching the rivet core. As the rivet core is stretched, the oil pressure in the storage chamber will continuously increase until the rivet core is broken, and the oil pressure will drop. In this application, based on the ratio of riveting tension value to oil pressure value, the change in tension when the rivet core breaks can be calculated by detecting the hydraulic pressure in the storage chamber using a detection device.

[0009] Since the pressure of the oil in the storage chamber is also the pressure of the oil in the oil chamber of the rivet gun, the pressure transmission loss is low and there is almost no delay. Therefore, it is possible to accurately capture the changes in oil pressure throughout the entire process of the rivet core being stretched until it breaks, and to deduce the real-time tensile force changes. This application can easily determine whether under-stretching or over-stretching has occurred, and can facilitate the recording and traceability of tensile force data.

[0010] Preferably, the tube component includes an installation tube and a sealing tube. The installation tube is detachably connected to the cylinder component, and the installation tube presses and fixes the sealing tube onto the cylinder component. The rod body is fitted onto the sealing tube.

[0011] By adopting the above technical solution, the tube body is divided into a combined structure of an installation tube and a sealing tube. The detachable connection of the installation tube is used to compress and fix the sealing tube. This can not only ensure the sealing performance between the sealing tube and the cylinder body, avoiding the leakage of oil in the storage chamber from affecting the pressure detection accuracy, but also make the sealing tube, which is directly attached to the rod body, a vulnerable part that can be replaced separately, without the need to replace the entire tube body, thus greatly reducing the cost and difficulty of later maintenance.

[0012] Preferably, the sealing tube has an oil inlet hole, and the oil inlet hole is equipped with an oil replenishment device; the rod has a near rest position and a far rest position, and the process of the rod moving from the near rest position to the far rest position includes a pushing stroke. When the rod is in the near rest position, the oil inlet hole and the storage cavity are connected. When the rod is in the pushing stroke, the rod closes the oil inlet hole.

[0013] By adopting the above technical solution, when the rod is in the near-rest position during non-working, the oil inlet and the storage cavity remain connected. The oil replenishment device can replenish the oil in the storage cavity in a timely manner to ensure that the storage cavity is always full of oil, avoiding inaccurate pressure transmission due to oil deficiency. When the rod enters the working push stroke, the rod's own structure seals the oil inlet, thus forming a completely sealed pressure chamber in the storage cavity. The above design can ensure that during the oil injection process of the rod, the oil pressure in the storage cavity can change synchronously with the riveting tension, with no oil leakage from the oil inlet, so that the pressure data collected by the test piece can truly reflect the actual riveting tension.

[0014] Preferably, the oil replenishing device includes a unidirectional guiding element installed in the oil inlet and an oil replenishing component connected to the unidirectional guiding element.

[0015] By adopting the above technical solution, the unidirectional conduction element only allows oil to flow from the oil replenishment component to the storage chamber in one direction. This effectively prevents oil from flowing back from the oil inlet to the oil replenishment component during the operation when the pressure in the storage chamber increases, avoiding a sudden drop in pressure in the storage chamber due to oil backflow and ensuring the stability of pressure detection. The oil replenishment component provides a continuous source of oil supply to the storage chamber, which can compensate for the slight loss of oil during the riveting operation, keeping the storage chamber full of oil at all times and avoiding detection errors caused by insufficient oil from the source.

[0016] Preferably, the one-way conduction element is a one-way valve; the oil replenishing component is any one of an oil reservoir, an oil cup, an oil storage bladder, an oil pillow, or an oil tank.

[0017] Preferably, the mounting tube includes a connecting plate with a first connecting hole, and the cylinder body has a second connecting hole. Fasteners are detachably connected to the first connecting hole and the second connecting hole.

[0018] By adopting the above technical solution, the first connecting hole of the connecting plate and the second connecting hole of the cylinder body are used in conjunction with fasteners to achieve a detachable connection between the mounting pipe and the cylinder body. The connection structure is simple and the disassembly and assembly operation is convenient, which facilitates the overall assembly, disassembly and maintenance and component replacement of the pipe body.

[0019] Preferably, the inner wall of the mounting tube has a limiting part, which is located on the side of the rod away from the cylinder body.

[0020] By adopting the above technical solution, the limiting part forms a mechanical limit on the far stop position of the rod, which can effectively prevent the rod from detaching from the sealing tube or colliding hard with the tube body due to excessive movement during the pushing stroke.

[0021] Preferably, a sealing element is provided between the rod and the cylinder component, and between the rod and the tube component.

[0022] By adopting the above technical solution, the multi-seal protection structure can prevent the oil in the storage cavity from leaking from the mating gap, and at the same time prevent external dust and impurities from entering the storage cavity and contaminating the oil.

[0023] Preferably, the cylinder body is equipped with a first magnetic attractor and a second magnetic attractor, and the piston can slide and attract the first magnetic attractor or the second magnetic attractor.

[0024] By adopting the above technical solution, the first magnetic suction component and the second magnetic suction component can respectively achieve magnetic positioning of the piston component in the near rest position and the far rest position, so that the piston component can be stably kept in the designated position when not in operation, and avoid the piston component from sliding randomly due to the movement and vibration of the electric riveting tool.

[0025] Preferably, the detection element is a pressure sensor.

[0026] In summary, the present invention has at least one of the following beneficial technical effects: 1. After connecting the storage chamber and the oil chamber and filling the storage chamber with oil, the piston can be moved by injecting air into the second or first vent. The movement of the piston drives the rod to move, thus pushing the oil into the oil chamber of the rivet gun. At this time, the rivet gun will perform the action of stretching the rivet core. As the rivet core is stretched, the oil pressure in the storage chamber will continuously increase until the rivet core is broken, and the oil pressure will drop. In this application, based on the ratio of riveting tension value to oil pressure value, the change in tension when the rivet core breaks can be calculated by detecting the hydraulic pressure of the oil in the storage chamber through the detection component. Since the pressure of the oil in the storage chamber is also the pressure of the oil in the oil chamber of the rivet gun, the pressure transmission loss is low and there is almost no delay. Therefore, the change in oil pressure during the entire process of stretching the rivet core to breakage can be captured in real time and accurately to derive the real-time tension change. This application can facilitate the determination of whether under-stretching or over-stretching occurs, and can facilitate the recording and traceability of tension data. 2. When the rod is in the near-rest position during non-working, the oil inlet and the storage chamber remain connected. The oil replenishment device can replenish the oil in the storage chamber in a timely manner to ensure that the storage chamber is always full of oil and avoid inaccurate pressure transmission due to oil shortage. When the rod enters the working push stroke, the rod's own structure seals the oil inlet, thus forming a completely sealed pressure chamber in the storage chamber. The above design can ensure that during the oil injection process of the rod, the oil pressure in the storage chamber can change synchronously with the riveting tension, with no oil leakage from the oil inlet, so that the pressure data collected by the test piece can truly reflect the actual riveting tension. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a tensile testing structure according to an embodiment of this application; Figure 2 This is a cross-sectional view of a tensile testing structure; Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0028] The following are labels in the attached diagram: 1. Cylinder body; 11. First chamber; 12. Second chamber; 13. First vent; 14. Second vent; 15. Cylinder body; 16. End cap; 17. Locking pin; 2. Tube body; 21. Storage chamber; 22. Mounting tube; 23. Sealing tube; 24. Oil inlet; 25. Connecting plate; 26. First connecting hole; 27. Limiting part; 3. Piston; 31. Rod; 32. Piston plate; 4. Detector; 5. Oil replenishing device; 51. One-way conduction element; 52. Oil replenishing component; 6. First magnetic attraction component; 7. Second magnetic attraction component. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0031] This application discloses a tensile testing structure. It is used to accurately measure the pressure change in the oil chamber during the entire process of a nail core being stretched until it breaks, so as to calculate the entire process of the tensile force change when the nail core breaks.

[0032] Reference Figure 1 and Figure 2A tensile force detection structure includes a cylinder body 1, a tube body 2, a piston body 3, and a detection element 4. The cylinder body 1 is connected to the tube body 2, and the interior of the tube body 2 communicates with the interior of the cylinder body 1. The tube body 2 is located on the left side of the cylinder body 1. The piston body 3 is slidably connected to the interior of the cylinder body 1 and extends into the tube body 2. The detection element 4 is installed on the outer wall of the tube body 2 and is a pressure sensor. The tensile force detection structure also includes a control module. The detection element 4 is electrically connected to the control module. The control module can control the riveting tool to work in response to the detection signal from the detection element 4. In this embodiment, the riveting tool is a rivet gun; in other embodiments, it can also be a rivet nut gun.

[0033] Reference Figure 1 and Figure 2 Specifically, the piston component 3 includes a connected piston plate 32 and a rod 31. The piston plate 32 is slidably connected to the inner wall of the cylinder component 1. The left end of the rod 31 extends into the tube component 2 and is fitted to the tube component 2. The inside of the tube component 2 is formed as a storage cavity 21 for communicating with the oil chamber. The storage cavity 21 is used to store oil, and the detection component 4 is used to detect the oil pressure in the storage cavity 21. In order to facilitate the injection of oil into the storage cavity 21, an oil inlet 24 is opened on the tube component 2, and an oil replenishment device 5 is installed in the oil inlet 24. To facilitate the movement of the piston plate 32 within the cylinder body 1, the piston plate 32 divides the cylinder body 1 into a first chamber 11 and a second chamber 12. The first chamber 11 is located to the left of the second chamber 12. The cylinder body 1 has a first air hole 13 communicating with the first chamber 11 and a second air hole 14 communicating with the second chamber 12. When air is injected into the first air hole 13 alone, the piston 3 moves to the right. When air is injected into the second air hole 14 alone, the piston 3 moves to the left.

[0034] An external rigid pipe connects the pipe body 2 to the rivet gun, thus connecting the oil chamber of the rivet gun to the storage chamber 21. The oil replenishment device 5 injects oil into the storage chamber 21 through the oil inlet 24 until the storage chamber is full. Then, an external air injection device injects air into the second chamber 12 through the second air hole 14, causing the piston plate 32 to move to the left. The movement of the piston plate 32 drives the rod 31 to move to the left, thus pushing the oil into the oil chamber of the rivet gun, which is equivalent to injecting oil into the rivet gun. At this time, the rivet gun performs the nail core stretching action. As the nail core stretches, the oil pressure in the storage chamber 21 will continuously increase. During this process, the detection element 4 can detect the oil pressure. After the nail core is stretched, it will break, and the oil pressure will drop back to normal.

[0035] In this application, based on the ratio of riveting tension to oil pressure, the change in riveting tension can be easily calculated by measuring the pressure change of the oil in the oil chamber, i.e., storage chamber 21. The specific ratio of riveting tension to oil pressure needs to be determined according to the actual situation such as different types of oil and different types of rivet guns, which will not be elaborated in this application.

[0036] In this application, since the pressure of the oil in the storage chamber 21 is also the pressure of the oil in the oil chamber of the rivet gun, the pressure transmission loss is low and there is almost no delay. This allows for real-time and accurate capture of oil pressure changes throughout the entire process of the rivet core being stretched until it breaks, thus deriving real-time tension changes. Based on the observation of the hydraulic pressure, it is easy to determine whether under-tension or over-tension has occurred, facilitating the recording and traceability of tension data. Furthermore, in this application, the pushing of oil by the rod 31 drives the movement of the piston disc of the rivet gun; the two power actuators are directly linked, and the detection data more closely reflects actual riveting conditions.

[0037] Reference Figure 1 and Figure 2 The cylinder body 1 includes a cylinder body 15 and two end caps 16 located at both ends of the cylinder body 15. A sealing ring is provided between the cylinder body 15 and each end cap 16. The two end caps 16 are connected to a locking pin 17. The locking pin 17 is locked to each end cap 16 by a nut. Therefore, after the locking pin 17 is removed, the two end caps 16 can be separated from the cylinder body 15.

[0038] Reference Figure 2 and Figure 3 The tube body 2 includes an installation tube 22 and a sealing tube 23. The installation tube 22 is detachably connected to the cylinder body 1. The installation tube 22 presses and fixes the sealing tube 23 onto the cylinder body 1. The rod body 31 is slidably attached to the inner wall of the sealing tube 23.

[0039] Reference Figure 1 and Figure 3 The mounting tube 22 includes a connecting plate 25, which has a plurality of first connecting holes 26. The cylinder body 1 has a second connecting hole corresponding to each of the first connecting holes 26. The first connecting holes 26 and the corresponding second connecting holes are detachably connected to fasteners, such as screws.

[0040] Reference Figure 2 and Figure 3The oil replenishment device 5 includes a one-way flow element 51 installed in the oil inlet 24 and an oil replenishment component 52 connected to the one-way flow element 51. Specifically, in this application, the one-way flow element 51 is a one-way valve, and the oil replenishment component 52 is any one of an oil reservoir, oil cup, oil sac, oil pillow, or oil tank. The one-way flow element 51 only allows oil to flow unidirectionally from the oil replenishment component 52 to the storage chamber 21, which can effectively prevent oil from flowing back from the oil inlet 24 to the oil replenishment component 52 during the working process when the pressure in the storage chamber 21 increases, avoiding a sudden drop in pressure in the storage chamber 21 due to oil backflow, and ensuring the stability of pressure detection; the oil replenishment component 52 provides a continuous source of oil replenishment to the storage chamber 21, which can make up for the slight loss of oil during the riveting operation, keeping the storage chamber 21 full of oil at all times, and avoiding detection errors caused by insufficient oil from the source.

[0041] Reference Figure 2 and Figure 3 The rod 31 has a near-rest position and a far-rest position. The process of the rod 31 moving from the near-rest position to the far-rest position includes the push stroke, and the process of the rod 31 moving from the far-rest position to the near-rest position is the return stroke. When the rod 31 is in the near-rest position, the rod 31 does not close the oil inlet 24, and the oil inlet 24 is connected to the storage cavity 21. When the rod 31 is in the push stroke, the rod 31 closes the oil inlet 24.

[0042] When the rod 31 is in its near-rest position (not in operation), the oil inlet 24 remains connected to the storage chamber 21. The oil replenishment component 52 can replenish the storage chamber 21 in a timely manner, ensuring that the storage chamber 21 is always full of oil and preventing inaccurate pressure transmission due to oil shortage. When the rod 31 enters the working push stroke, the structure of the rod 31 itself seals the oil inlet 24, thus forming a completely sealed pressure chamber in the storage chamber 21. This design ensures that during the oil injection process of the rod 31, the oil pressure in the storage chamber 21 changes synchronously with the riveting tension, with no oil leakage from the oil inlet 24, allowing the pressure data collected by the detection component 4 to accurately reflect the actual riveting tension.

[0043] Reference Figure 2 and Figure 3 To minimize oil leakage from the mating gap within the storage chamber 21 and further ensure that the storage chamber 21 forms a completely sealed pressure chamber to guarantee the accuracy of the pressure data collected by the detection element 4, multiple seals, such as sealing rings, are provided between the rod body 31 and the cylinder body 1, as well as between the rod body 31 and the tube body 2.

[0044] Reference Figure 2To prevent the piston 31 (rod body 3) from over-moving, the inner wall of the mounting tube 22 has a limiting part 27 located on the left side of the rod 31. The limiting part 27 mechanically limits the far-end position of the rod 31, effectively preventing the rod 31 from detaching from the sealing tube 23 or colliding hard with the tube body 2 due to excessive movement during the push stroke. Furthermore, the reliable limitation of the far-end position of the rod 31 ensures control over the oil supply to the oil chamber of the rivet gun. The oil supply is related to the piston disc movement distance of the rivet gun, which is also related to the nail core extension length.

[0045] Reference Figure 2 The cylinder body 1 is equipped with a first magnetic attractor 6 and a second magnetic attractor 7. The first magnetic attractor 6 and the second magnetic attractor 7 are located on both sides of the piston plate 32. The first magnetic attractor 6 and the second magnetic attractor 7 are magnets. The piston plate 32 can slide and attract the first magnetic attractor 6 or the second magnetic attractor 7. The piston plate 32 is made of a metal that can attract magnets, such as plastic or carbon steel.

[0046] The first magnetic suction component 6 and the second magnetic suction component 7 can respectively achieve magnetic positioning of the piston component 3 in the near rest position and the far rest position, so that the piston component 3 can be stably stopped in the designated position when not in operation, and avoid the piston component 3 from sliding randomly due to the movement and vibration of the electric riveting tool.

[0047] Compared to the traditional method of directly injecting oil into the oil chamber of the rivet gun using a hydraulic pump, the amount of oil in the storage chamber 21 in this application is constant. Furthermore, due to the incompressible nature of the oil, the calculation of the hydraulic pressure is very accurate, and the oil pressure depends entirely on the resistance, i.e., the load, experienced when the nail core is stretched.

[0048] This application adopts a gas-liquid hybrid drive design. Gas, as the power source for pushing the piston 3, enables the piston 3 to respond quickly and without delay. Oil, as the intermediate transmission medium of power, can minimize noise, such as the impact sound of the piston 3. Oil itself has viscosity, and oil will buffer the movement of the piston 3.

[0049] Furthermore, real-time monitoring of the hydraulic pressure can help determine whether the gripping mechanism at the front end of the rivet gun is slipping on the nail core. If the hydraulic pressure drops rapidly before reaching the rated value, it can be inferred that the nail core has slipped. When the rivet gun is operating without a load, i.e., not gripping the nail core, the hydraulic pressure will be at the rated normal pressure. Therefore, if the hydraulic pressure is not at the rated normal pressure when the rivet gun is operating under no-load conditions, i.e., when the piston 3 moves to push the oil, it indicates that the rivet gun power unit has a fault and needs to be repaired.

[0050] The implementation principle of a tension detection structure in this embodiment is as follows: with the storage chamber 21 filled with oil, air is injected into the second chamber 12 through the second air hole 14, causing the piston plate 32 to move to the left. The movement of the piston plate 32 drives the rod 31 to move to the left, thereby realizing the injection of oil into the oil chamber of the rivet gun, which is equivalent to the rivet gun being filled with oil. At this time, the rivet gun performs the rivet core stretching action. As the rivet core stretches, the oil pressure in the storage chamber 21 will continuously increase. During this process, the detection element 4 can detect the oil pressure. After the rivet core is stretched, it will be broken, and the oil pressure will drop back to normal.

[0051] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A tensile force detection structure, characterized in that: Applied to riveting tools; a tensile testing structure includes a connected cylinder (1) and a tube (2), the interior of the tube (2) being in communication with the interior of the cylinder (1); the cylinder (1) is slidably connected to a piston (3), the piston (3) dividing the interior of the cylinder (1) into a first chamber (11) and a second chamber (12), the cylinder (1) having a first air hole (13) communicating with the first chamber (11) and a second air hole (14) communicating with the second chamber (12); The piston component (3) includes a rod (31) extending into the tube component (2) and the rod (31) is fitted to the tube component (2). The tube component (2) is formed inside a storage cavity (21) for communicating with an oil chamber. A detection component (4) for detecting the hydraulic pressure of the oil in the storage cavity (21) is installed on the tube component (2). A tensile testing structure also includes a control module. The testing component (4) is connected to the control module, and the control module can control the riveting tool to work in response to the testing signal of the testing component (4).

2. The tensile force detection structure according to claim 1, characterized in that: The tube component (2) includes an installation tube (22) and a sealing tube (23). The installation tube (22) is detachably connected to the cylinder component (1). The installation tube (22) presses and fixes the sealing tube (23) onto the cylinder component (1). The rod (31) is fitted onto the sealing tube (23).

3. The tensile force detection structure according to claim 2, characterized in that: The sealing tube (23) has an oil inlet hole (24), and the oil inlet hole (24) is equipped with an oil replenishment device (5); the rod (31) has a near rest position and a far rest position. The process of the rod (31) moving from the near rest position to the far rest position includes a push stroke. When the rod (31) is in the near rest position, the oil inlet hole (24) and the storage cavity (21) are connected. When the rod (31) is in the push stroke, the rod (31) closes the oil inlet hole (24).

4. The tensile force detection structure according to claim 3, characterized in that: The oil replenishment device (5) includes a one-way conduction element (51) installed in the oil inlet (24) and an oil replenishment component (52) connected to the one-way conduction element (51).

5. A tensile force detection structure according to claim 4, characterized in that: The one-way conduction element (51) is a one-way valve; the oil replenishment element (52) is any one of an oil reservoir, an oil replenishment cup, an oil storage bladder, an oil pillow, or an oil replenishment tank.

6. The tensile force detection structure according to claim 2, characterized in that: The mounting tube (22) includes a connecting plate (25), on which a first connecting hole (26) is opened, and on which a second connecting hole is opened, and the first connecting hole (26) and the second connecting hole are detachably connected with fasteners.

7. A tensile force detection structure according to claim 2, characterized in that: The inner wall of the mounting tube (22) has a limiting part (27), which is located on the side of the rod (31) away from the cylinder part (1).

8. A tensile force detection structure according to claim 1, characterized in that: Sealing elements are provided between the rod (31) and the cylinder (1) and between the rod (31) and the tube (2).

9. A tensile force detection structure according to claim 1, characterized in that: The cylinder body (1) is equipped with a first magnetic attractor (6) and a second magnetic attractor (7), and the piston (3) can slide and attract the first magnetic attractor (6) or the second magnetic attractor (7).

10. A tensile force detection structure according to claim 1, characterized in that: The detection component (4) is a pressure sensor.

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