A shock absorbing tube welding device

Abstract

The present invention relates to the field of vehicle shock absorption, and in particular, to a shock absorber cylinder welding device. A fixing component, the fixing component is a tubular body; a tensioning component, the tensioning component includes a head unit and a wedge unit; the head unit includes a second head portion; the second head portion includes a head body, a first mounting groove, and a first guide portion; a movable component, the tensioning component is sleeved on the outer peripheral side of the movable component; the shock absorber cylinder welding device includes a first state and a second state; the first state includes the first rod abutting against a side of the wedge unit close to the center axis of the head body, and the distance between the side of the wedge unit away from the center axis of the head body and the center axis of the head body is greater than the radius of the head body; the second state includes the distance between the side of the wedge unit away from the center axis of the head body and the center axis of the head body is less than or equal to the outer diameter of the head body. In this way, the problem of loose abutment of the shock absorber cylinder welding device is solved.

Description

Technical Field

[0001] The invention relates to the field of vehicle shock absorption, and in particular to a shock absorption tube welding device. Background Art

[0002] During the driving process of a vehicle, due to uneven road conditions, shock absorbers are usually installed on the vehicle to absorb the vibration caused by the uneven road surface during driving and improve the safety and stability of the vehicle. The welding quality of the shock absorber directly affects the performance and service life of the shock absorber.

[0003] The shock absorber cylinder is mainly composed of the shock absorber cylinder tube and the shock absorber cylinder cover. When welding the two, it is necessary not only to ensure the sealing and firmness between the shock absorber cylinder tube and the shock absorber cylinder cover, but also to ensure the smoothness of the inner wall of the shock absorber cylinder. A wedge unit is usually installed on the shock absorber cylinder welding device. During welding, the shock absorber cylinder welding device is fixed to the inner wall of the shock absorber cylinder through the wedge unit. However, during welding, the wedge unit may not be tightly connected to the shock absorber cylinder welding device or the inner wall of the shock absorber cylinder, resulting in a large contact resistance, causing sparks and burns at the contact point, affecting the performance and quality of the shock absorber cylinder. Summary of the invention

[0004] In order to solve the problem that the shock-absorbing cylinder welding device is not tightly abutted, the present invention provides a shock-absorbing cylinder welding device, comprising:

[0005] A fixing component, wherein the fixing component is a tubular body;

[0006] A tensioning assembly, the tensioning assembly includes a head unit and a wedge unit; the head unit includes a second head portion; the second head portion includes a head body, a first mounting groove, and a first guide portion; the head body is a tubular body; one end of the head body is detachably connected to the fixing assembly, and the other end extends away from the fixing assembly; the first mounting groove extends from the outer peripheral wall of the head body to the inner peripheral wall; the first guide portion is fixedly connected to an end of the first mounting groove away from the fixing assembly; the wedge unit is arranged in the first mounting groove; the wedge unit is slidably connected to the first guide portion; A<90°; wherein, A includes the minimum angle between the contact surface between the wedge unit and the first guide portion and the central axis of the head body;

[0007] A movable assembly, wherein the tensioning assembly is sleeved on the outer peripheral side of the movable assembly; the movable assembly comprises a first rod; the outer diameter of the first rod gradually decreases from an end away from the head body to an end close to the head body;

[0008] The shock-absorbing cylinder welding device includes a first state and a second state; the first state includes the first rod abutting against a side of the wedge block unit close to the central axis of the plug body, and a distance between a side of the wedge block unit away from the central axis of the plug body and the central axis of the plug body is greater than a radius of the plug body; the second state includes the distance between a side of the wedge block unit away from the central axis of the plug body and the central axis of the plug body is less than or equal to an outer diameter of the plug body.

[0009] In some embodiments, A>B; wherein, B includes the minimum angle between the normal line of the first rod inclined surface and the central axis of the head body.

[0010] In some embodiments, the second top head portion further includes a second guide portion; the second guide portion is fixedly connected to an end of the first mounting groove close to the fixing assembly.

[0011] In some embodiments, C≥A; wherein, C includes the minimum angle between the abutting surface of the wedge unit and the second guide portion and the central axis of the plug body.

[0012] In some embodiments, the second head portion further comprises at least one second mounting groove; the second mounting groove is recessed from the outer circumferential surface of the head body toward the inner circumferential surface of the head body; the second mounting groove is arranged along the circumferential direction of the head body;

[0013] The wedge unit comprises a wedge portion and a third mounting groove; the wedge portion is arranged in the first mounting groove; the wedge portion is slidably connected with the first guide portion; the wedge portion moves along the inclined surface of the first guide portion; the third mounting groove is recessed from one side of the wedge portion to the other side; the third mounting groove is connected with the second mounting groove;

[0014] The head unit further includes an elastic ring; the elastic ring is arranged in the third mounting groove and the second mounting groove;

[0015] The first state includes that the first rod abuts against a side of the wedge portion close to the central axis of the plug body, and the distance between the side of the wedge portion away from the central axis of the plug body and the central axis of the plug body is greater than the outer diameter of the plug body; the elastic ring deforms and applies a force to the wedge portion in a direction close to the plug body; the second state includes that the distance between the side of the wedge portion away from the central axis of the plug body and the central axis of the plug body is less than or equal to the outer diameter of the plug body.

[0016] In some embodiments, the wedge block portion includes a first wedge block and a second wedge block; the first wedge block is arranged in the first mounting groove; the first wedge block is slidably connected to the first guide portion; the first wedge block moves along the inclined surface of the first guide portion; the first wedge block and the second wedge block are detachably connected; the second wedge block is arranged on a side of the first wedge block away from the central axis of the head body; the second wedge block is slidably connected to the first guide portion; the second wedge block moves along the inclined surface of the first guide portion; the hardness of the first wedge block is greater than the hardness of the second wedge block;

[0017] The third mounting groove is recessed from one side of the second wedge away from the central axis of the head body toward the other side.

[0018] In some embodiments, the head unit includes a plurality of the first mounting grooves; the plurality of the first mounting grooves are arranged at intervals along the circumferential direction of the head body;

[0019] The tensioning assembly includes a plurality of wedge units; one wedge unit is arranged in each of the first mounting grooves.

[0020] In some embodiments, D<E; wherein D includes the distance between the portion of the second mounting groove away from the first mounting groove and the fixing assembly; and E includes the distance between the portion of the second mounting groove close to the first mounting groove and the fixing assembly;

[0021] F>G; wherein, F includes the distance between the portion of the third mounting slot away from the first mounting slot and the fixing assembly; and G includes the distance between the portion of the third mounting slot close to the first mounting slot and the fixing assembly.

[0022] In some embodiments, the head unit also includes a first head portion; one end of the first head portion is fixedly connected to an end of the second head portion away from the fixing assembly, and the other end extends in a direction away from the second head portion; the outer diameter of the first head portion gradually decreases from an end close to the second head portion to an end away from the second head portion.

[0023] In some embodiments, the fixing assembly includes a first base unit and a second base unit; the first base unit is fixedly connected to the second base unit; the second top head portion is detachably connected to an end of the first base unit away from the second base unit; and the outer diameter of the second base unit is larger than the outer diameter of the first base unit.

[0024] In order to solve the problem that the shock-absorbing tube welding device is not tightly connected, the present invention has the following advantages:

[0025] The first guide portion is fixedly connected to one end of the first mounting groove away from the fixing assembly, the wedge unit is slidably connected to the first guide portion, and the minimum angle A between the contact surface of the wedge unit and the first guide portion and the central axis of the head body is less than 90°, so that the pressure between the first guide portion and the wedge unit is reduced, thereby reducing the wear of the wedge unit when it moves and extending the service life of the wedge unit. At the same time, it also makes the contact between the wedge unit and the first guide portion tighter, the contact surface larger, and the contact resistance smaller, which is conducive to improving the welding quality of the shock absorber cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a shock-absorbing cylinder welding device according to a first embodiment is shown;

[0027] Figure 2 A schematic diagram of a shock-absorbing tube welding device according to a second embodiment is shown;

[0028] Figure 3 A schematic diagram of a shock-absorbing tube welding device according to a third embodiment is shown;

[0029] Figure 4 A partial schematic diagram of a shock-absorbing cylinder welding device according to a third embodiment is shown;

[0030] Figure 5 A schematic diagram of the welding assembly of the shock-absorbing cylinder of the first embodiment is shown;

[0031] Figure 6 A schematic diagram of the welding assembly of the shock-absorbing tube of the second embodiment is shown.

[0032] Figure numerals: 10 fixing assembly; 11 first base unit; 12 second base unit; 20 tensioning assembly; 21 head unit; 211 first head portion; 212 second head portion; 2121 head body; 2122 first mounting groove; 2123 second mounting groove; 2124 first guide portion; 2125 second guide portion; 213 elastic ring; 22 wedge unit; 221 wedge portion; 2211 first wedge; 2212 second wedge; 222 third mounting groove; 30 movable assembly; 31 first rod; 32 second rod; 40 shock-absorbing cylinder; 41 shock-absorbing cylinder tube; 42 shock-absorbing cylinder cover. DETAILED DESCRIPTION

[0033] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0034] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0035] Shock absorbers are usually installed on vehicles to absorb vibrations caused by uneven roads when the vehicle is driving, and the welding quality of the shock absorber cylinder 40 directly affects the performance and service life of the shock absorber. Figure 5 As shown, the shock absorber tube cover 42 and the shock absorber tube tube 41 are usually welded together during welding. If the wedge unit 22 is not tightly connected to the inner wall of the shock absorber tube 40 or the shock absorber tube 40 welding device, the contact resistance at the contact point may be too large, causing sparks and burns. This embodiment discloses a shock absorber tube 40 welding device, such as Figure 3 As shown, the shock-absorbing cylinder 40 welding device may include a fixing assembly 10 , a tensioning assembly 20 and a movable assembly 30 .

[0036] like Figure 6As shown, the fixing component 10 can be a tubular body, so that the shock absorbing cylinder 40 can be sleeved on the fixing component 10 to fix the relative position of the shock absorbing cylinder 40 and the fixing component 10.

[0037] like Figure 1 As shown, the tensioning assembly 20 may include a head unit 21 and a wedge unit 22. The head unit 21 may include a second head portion 212. The second head portion 212 may include a head body 2121, a first mounting groove 2122, and a first guide portion 2124. The head body 2121 may be a tubular body, one end of which is detachably connected to the fixing assembly 10, and the other end of which extends away from the fixing assembly 10. The first mounting groove 2122 may pass through from the outer circumferential wall of the head body 2121 to the inner circumferential wall, and the wedge unit 22 may be disposed in the first mounting groove 2122. The first guide portion 2124 may be fixedly connected to one end of the first mounting groove 2122 away from the fixing assembly 10, and the wedge unit 22 may be slidably connected to the first guide portion 2124. As shown Figure 4 As shown, the minimum angle between the contact surface between the wedge unit 22 and the first guide portion 2124 and the central axis may be A, and A may be less than 90°, so as to facilitate the movement of the wedge unit 22 in the first guide portion 2124.

[0038] The tensioning assembly 20 can be sleeved on the outer peripheral side of the movable assembly 30. The movable assembly 30 can include a first rod 31. The outer diameter of the first rod 31 gradually decreases from the end away from the head body 2121 to the end close to the head body 2121, so that the movement of the first rod 31 can provide the wedge unit 22 with a supporting force along the normal of the inclined surface of the first rod 31 and away from the central axis, thereby pushing the movement of the wedge unit 22. The minimum angle between the contact surface of the wedge unit 22 and the first guide portion 2124 and the central axis of the head body 2121 can be less than 90°, so that the first rod 31 can provide the wedge unit 22 with a thrust force along the direction of the first guide portion 2124, and the pressure between the first guide portion 2124 and the wedge unit 22 is reduced, thereby reducing the wear of the wedge unit 22 when it moves, and extending the service life of the wedge unit 22. At the same time, the contact between the wedge unit 22 and the first guide portion 2124 is made tighter, and the contact surface is larger. During the welding process, the current can flow from the shock absorber cylinder 40 through the wedge unit 22 into the shock absorber cylinder 40 welding device, and then flow out of the shock absorber cylinder 40 welding device from the fixing assembly 10. The larger contact area between the wedge unit 22 and the first guide portion 2124 reduces the contact resistance, which can reduce the risk of sparks and burns, and is beneficial to improving the welding quality of the shock absorber cylinder 40. In other embodiments, the shape of the contact point between the wedge unit 22 and the first rod 31 can be adapted to the conical surface of the first rod 31, so that the first rod 31 can better push the wedge unit 22 to move.

[0039] The shock-absorbing cylinder 40 welding device may include a first state and a second state. The first state may include the first rod 31 abutting against a side of the wedge unit 22 close to the central axis of the head body 2121, so that the wedge unit 22 can move in a direction away from the central axis, and the distance between the side of the wedge unit 22 away from the central axis of the head body 2121 and the central axis of the head body 2121 is greater than the radius of the head body 2121, so that the wedge unit 22 can contact the inner wall of the shock-absorbing cylinder 40, thereby playing a fixing role. The second state may include the first rod 31 moving along the central axis toward the fixing assembly 10, and the distance between the side of the first rod 31 wedge unit 22 away from the central axis of the head body 2121 and the central axis of the head body 2121 can be less than or equal to the outer diameter of the head body 2121, so that the wedge unit 22 can move relative to the shock-absorbing cylinder 40. In other embodiments, the movable component 30 may further include a second rod 32, which may be fixedly connected to an end of the first rod 31 away from the head body 2121, so that the second rod 32 can drive the first rod 31 to move along the central axis, thereby facilitating the control of switching between the first state and the second state of the shock-absorbing cylinder 40 welding device.

[0040] In this embodiment, if Figure 4 As shown, the minimum angle A between the contact surface of the wedge unit 22 and the first guide portion 2124 and the central axis can be greater than the minimum angle B between the normal line of the inclined surface of the first rod 31 and the central axis. This is convenient for the first rod 31 to drive the wedge unit 22 to move away from the central axis while providing a certain support force to the wedge, so that there is enough contact force between the wedge unit 22 and the first guide portion 2124, and prevent the contact resistance from being too large due to loose contact, thereby causing sparks inside the shock absorber 40 to form welding spots, affecting the normal use of the shock absorber 40.

[0041] In this embodiment, the second top portion 212 may further include a second guide portion 2125, which may be fixedly connected to one end of the first mounting groove 2122 close to the fixing assembly 10, so that the wedge unit 22 may move along the second guide portion 2125, further reducing the wear of the wedge unit 22 during movement and extending the service life of the wedge unit 22. At the same time, the wedge unit 22 and the second guide portion 2125 are more closely abutted, the contact surface is larger, and the contact resistance is smaller, which is conducive to improving the welding quality of the shock-absorbing cylinder 40.

[0042] In this embodiment, if Figure 4As shown, the minimum angle C between the contact surface of the wedge unit 22 and the second guide portion 2125 and the central axis can be greater than or equal to the minimum angle A between the contact surface of the wedge unit 22 and the first guide portion 2124 and the central axis. While the first rod 31 can drive the wedge unit 22 to move away from the central axis, the second guide portion 2125 can also ensure sufficient contact force between the wedge unit 22 and the first guide portion 2124, thereby preventing the contact resistance from being too large due to loose contact, thereby causing sparks inside the shock absorber 40 to form welding spots, and affecting the normal use of the shock absorber 40.

[0043] In this embodiment, the second head portion 212 may further include at least one second mounting groove 2123. The second mounting groove 2123 may be recessed from the outer circumferential surface of the head body 2121 toward the inner circumferential surface of the head body 2121. The second mounting groove 2123 may be arranged along the circumferential direction of the head body 2121.

[0044] The wedge unit 22 may include a wedge portion 221 and a third mounting groove 222. The wedge portion 221 may be disposed in the first mounting groove 2122. The wedge portion 221 may be slidably connected to the first guide portion 2124, so that the wedge portion 221 may move along the inclined surface of the first guide portion 2124. The third mounting groove 222 may be recessed from one side of the wedge portion 221 away from the central axis toward the other side. The third mounting groove 222 may be connected to the second mounting groove 2123.

[0045] The head unit 21 may further include an elastic ring 213. The elastic ring 213 may be disposed in the third mounting groove 222 and the second mounting groove 2123. The design that the second mounting groove 2123 and the third mounting groove 222 are recessed toward the central axis allows the elastic ring 213 to be embedded in the third mounting groove 222 and the second mounting groove 2123, which is convenient for fixing the position of the elastic ring 213. At the same time, the diameter of the elastic ring 213 may be smaller than the diameter of the outer peripheral surface of the head body 2121, thereby preventing the elastic ring 213 from having an excessively large diameter and affecting the placement of the shock-absorbing cylinder 40 welding device into the shock-absorbing cylinder 40.

[0046] The first state may include that the first rod 31 abuts against the side of the wedge block 221 close to the central axis of the head body 2121, and the distance between the side of the wedge block 221 away from the central axis of the head body 2121 and the central axis of the head body 2121 is greater than the outer diameter of the head body 2121, so that the wedge block 221 can abut against the inner wall of the shock-absorbing cylinder 40, fix the relative position of the shock-absorbing cylinder 40 and the shock-absorbing cylinder 40 welding device, and facilitate the welding of the shock-absorbing cylinder 40 tube and the shock-absorbing cylinder 40 cover. At this time, the elastic ring 213 can be deformed and exert a force on the wedge block 221 in the direction close to the head body 2121, so that the wedge block 221 moves in the direction close to the central axis in the second state. The second state may include that the distance between the side of the wedge block 221 away from the central axis of the head body 2121 and the central axis of the head body 2121 is less than or equal to the outer diameter of the head body 2121, so that the shock-absorbing cylinder 40 can move relative to the wedge block 221.

[0047] In this embodiment, the wedge block portion 221 may include a first wedge block 2211 and a second wedge block 2212. The first wedge block 2211 may be disposed in the first mounting groove 2122. The first wedge block 2211 may be slidably connected to the first guide portion 2124, so that the first wedge block 2211 may move along the inclined surface of the first guide portion 2124. The first wedge block 2211 and the second wedge block 2212 are detachably connected. The second wedge block 2212 may be disposed on a side of the first wedge block 2211 away from the central axis of the head body 2121, so that the second wedge block 2212 may be slidably connected to the first guide portion 2124. The second wedge block 2212 may move along the inclined surface of the first guide portion 2124. The hardness of the first wedge block 2211 may be greater than that of the second wedge block 2212. The lower hardness of the second wedge block 2212 allows the second wedge block 2212 to fit more closely with the first rod 31. The greater hardness of the first wedge block 2211 makes the first wedge block 2211 more durable, thereby increasing the service life of the shock absorber cylinder 40 welding device.

[0048] The third mounting groove 222 can be recessed from one side of the second wedge block 2212 away from the central axis of the head body 2121 to the other side, so as to facilitate fixing the position of the elastic ring 213 and also make the diameter of the elastic ring 213 smaller than the diameter of the outer peripheral surface of the head body 2121, so as to prevent the elastic ring 213 from being too large in diameter and affecting the placement of the shock-absorbing cylinder 40 welding device into the shock-absorbing cylinder 40.

[0049] In this embodiment, the head unit 21 may include a plurality of first mounting grooves 2122. The plurality of first mounting grooves 2122 are arranged at intervals along the circumferential direction of the head body 2121. The tensioning assembly 20 may include a plurality of wedge units 22. A wedge unit 22 may be arranged in each first mounting groove 2122. The plurality of wedge units 22 may be opened or tightened at the same time, thereby increasing the tightness of the connection between the wedge unit 22 and the inner wall of the shock-absorbing cylinder 40 when processing the shock-absorbing cylinder 40.

[0050] In this embodiment, the distance D between the portion of the second mounting groove 2123 away from the first mounting groove 2122 and the fixing assembly 10 is smaller than the distance E between the portion of the second mounting groove 2123 close to the first mounting groove 2122 and the fixing assembly 10, so that when the wedge unit 22 switches from the first state to the second state, the elastic ring 213 in the second mounting groove 2123 can reduce the pressure exerted by the wedge unit 22 on the guide portion along the radial direction of the head body 2121, and provide a component force along the direction of the first guide portion 2124, so that the wedge unit 22 can switch smoothly from the first state to the second state, while reducing the wear on the first guide portion 2124, so that the wedge unit 22 can switch from the first state to the second state.

[0051] The distance F between the portion of the third mounting groove 222 away from the first mounting groove 2122 and the fixing assembly 10 can be greater than the distance G between the portion of the third mounting groove 222 close to the first mounting groove 2122 and the fixing assembly 10, so that when the wedge unit 22 switches from the first state to the second state, the elastic ring 213 in the third mounting groove 222 can reduce the pressure exerted by the wedge unit 22 on the guide portion along the radial direction of the head body 2121, and at the same time provide a component force along the direction of the first guide portion 2124, so that the wedge unit 22 can switch smoothly from the first state to the second state, while reducing the wear on the first guide portion 2124, so that the wedge unit 22 can switch from the first state to the second state.

[0052] In this embodiment, the head unit 21 may further include a first head portion 211. One end of the first head portion 211 is fixedly connected to an end of the second head portion 212 away from the fixing assembly 10, thereby increasing the stability of the connection between the first head portion 211 and the second head portion 212. The other end of the first head portion 211 extends in a direction away from the second head portion 212. The outer diameter of the first head portion 211 gradually decreases from an end close to the second head portion 212 toward an end away from the second head portion 212. Even if there is an error in the position of the shock-absorbing cylinder 40 and the shock-absorbing cylinder 40 welding device during the alignment process, the shock-absorbing cylinder 40 can be guided to the correct position along the inclined surface of the first head portion 211, thereby playing a certain guiding role in the placement of the shock-absorbing cylinder 40, and facilitating the fixing of the relative position of the shock-absorbing cylinder 40 and the shock-absorbing cylinder 40 welding device.

[0053] In this embodiment, if Figure 2As shown, the fixing assembly 10 may include a first base unit 11 and a second base unit 12. The first base unit 11 and the second base unit 12 may be fixedly connected. The second top head 212 may be detachably connected to an end of the first base unit 11 away from the second base unit 12, so as to facilitate the disassembly and replacement of the second top head 212 and the first base unit 11. The outer diameter of the second base unit 12 may be greater than the outer diameter of the first base unit 11, so that when the shock-absorbing cylinder 40 is placed on the shock-absorbing cylinder 40 welding device, the shock-absorbing cylinder 40 may be axially positioned.

[0054] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A shock-absorbing cylinder welding device, It is characterized in that The shock-absorbing cylinder welding device comprises: A fixing component, wherein the fixing component is a tubular body; The tensioning assembly comprises a head unit and a wedge unit; the head unit comprises a second head portion; the second head portion comprises a head body, a first mounting groove and a first guide portion; the head body is a tubular body; one end of the head body is detachably connected to the fixing assembly, and the other end extends away from the fixing assembly; the first mounting groove extends from the outer peripheral wall of the head body to the inner peripheral wall; the first guide portion is fixedly connected to an end of the first mounting groove away from the fixing assembly; the wedge unit is arranged in the first mounting groove; the wedge unit is slidably connected to the first guide portion; A<90°; wherein, A comprises the minimum angle between the contact surface between the wedge unit and the first guide portion and the central axis of the head body; A movable assembly, wherein the tensioning assembly is sleeved on the outer peripheral side of the movable assembly; the movable assembly comprises a first rod; the outer diameter of the first rod gradually decreases from an end away from the head body to an end close to the head body; The shock-absorbing cylinder welding device includes a first state and a second state; the first state includes that the first rod abuts against a side of the wedge unit close to the central axis of the plug body, and the distance between the side of the wedge unit away from the central axis of the plug body and the central axis of the plug body is greater than the radius of the plug body; the second state includes that the distance between the side of the wedge unit away from the central axis of the plug body and the central axis of the plug body is less than or equal to the outer diameter of the plug body; The second head portion further comprises at least one second mounting groove; the second mounting groove is recessed from the outer circumferential surface of the head body toward the inner circumferential surface of the head body; the second mounting groove is arranged along the circumferential direction of the head body; The wedge unit comprises a wedge portion and a third mounting groove; the wedge portion is arranged in the first mounting groove; the wedge portion is slidably connected with the first guide portion; the wedge portion moves along the inclined surface of the first guide portion; the third mounting groove is recessed from one side of the wedge portion to the other side; the third mounting groove is connected with the second mounting groove; The head unit further includes an elastic ring; the elastic ring is arranged in the third mounting groove and the second mounting groove; The first state includes that the first rod abuts against a side of the wedge portion close to the central axis of the plug body, and the distance between the side of the wedge portion away from the central axis of the plug body and the central axis of the plug body is greater than the outer diameter of the plug body; the elastic ring deforms and applies a force to the wedge portion in a direction close to the plug body; the second state includes that the distance between the side of the wedge portion away from the central axis of the plug body and the central axis of the plug body is less than or equal to the outer diameter of the plug body.

2. A shock-absorbing cylinder welding device according to claim 1, It is characterized in that A>B; wherein, B includes the minimum angle between the normal line of the inclined surface of the first rod and the central axis of the plug body.

3. A shock-absorbing cylinder welding device according to claim 2, It is characterized in that The second top head portion further comprises a second guide portion; the second guide portion is fixedly connected to an end of the first installation slot close to the fixing assembly.

4. A shock-absorbing cylinder welding device according to claim 3, It is characterized in that C≥A; wherein, C includes the minimum angle between the wedge unit, the abutting surface of the second guide portion and the central axis of the plug body.

5. A shock-absorbing cylinder welding device according to claim 1, It is characterized in that The wedge block portion includes a first wedge block and a second wedge block; the first wedge block is arranged in the first mounting groove; the first wedge block is slidably connected to the first guide portion; the first wedge block moves along the inclined surface of the first guide portion; the first wedge block and the second wedge block are detachably connected; the second wedge block is arranged on a side of the first wedge block away from the central axis of the head body; the second wedge block is slidably connected to the first guide portion; the second wedge block moves along the inclined surface of the first guide portion; the hardness of the first wedge block is greater than the hardness of the second wedge block; The third mounting groove is recessed from one side of the second wedge away from the central axis of the head body toward the other side.

6. A shock-absorbing cylinder welding device according to claim 1, It is characterized in that The head unit comprises a plurality of the first mounting grooves; the plurality of the first mounting grooves are arranged at intervals along the circumferential direction of the head body; The tensioning assembly includes a plurality of wedge units; one wedge unit is arranged in each of the first mounting grooves.

7. A shock-absorbing cylinder welding device according to claim 1, It is characterized in that D<E; wherein D includes the distance between the portion of the second mounting groove away from the first mounting groove and the fixing assembly; and E includes the distance between the portion of the second mounting groove close to the first mounting groove and the fixing assembly; F>G; wherein, F includes the distance between the portion of the third mounting slot away from the first mounting slot and the fixing assembly; and G includes the distance between the portion of the third mounting slot close to the first mounting slot and the fixing assembly.

8. A shock-absorbing cylinder welding device according to claim 1, It is characterized in that The head unit also includes a first head portion; one end of the first head portion is fixedly connected to an end of the second head portion away from the fixing assembly, and the other end extends in a direction away from the second head portion; the outer diameter of the first head portion gradually decreases from an end close to the second head portion to an end away from the second head portion.

9. A shock-absorbing cylinder welding device according to claim 1, It is characterized in that The fixing assembly includes a first base unit and a second base unit; the first base unit is fixedly connected to the second base unit; the second top head portion is detachably connected to an end of the first base unit away from the second base unit; the outer diameter of the second base unit is greater than the outer diameter of the first base unit.

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