A tightening device

Abstract

The utility model provides a kind of tightening device, it is related to tightening installation technical field, and the tightening device includes base, driving mechanism and multiple torsion transmission mechanism, driving mechanism includes the first driving part being set to base, driving gear being connected with the first driving part and transmission gear being rotationally connected to base, transmission gear is equipped with outer tooth structure and inner tooth structure, driving gear is engaged with outer tooth structure, multiple torsion transmission mechanism is distributed on base along the circumference of transmission gear with interval, and is engaged with inner tooth structure respectively, the first driving part is used to drive transmission gear rotation by driving gear, and multiple torsion transmission mechanism is driven to rotate synchronously to output tightening torque. Thus, it can realize the output tightening torque of multiple pieces of to-be-tightened parts simultaneously, and then complete the tightening operation of multiple pieces of to-be-tightened parts at a time, not only can improve the installation efficiency of welding tooling, but also facilitate the control of torque during tightening process, ensure the consistency of output torque.

Description

Technical Field

[0001] This utility model relates to the field of tightening and installation technology, and more specifically, to a tightening device. Background Technology

[0002] Welding is a critical process for flat wire stators, and its quality and efficiency directly impact the overall capacity and production costs of the stator production line. During welding, welding fixtures are typically used to control the overlap of the welded wire leads in order to improve welding quality.

[0003] Currently, when installing welding fixtures on the production line for flat wire stators, operators use hand-held tightening guns to tighten the locking points of the welding fixtures. However, the welding fixtures have dozens (e.g., 54) locking points, resulting in low efficiency when tightening manually, and there is also a large error in controlling the torque during the tightening process. Utility Model Content

[0004] The problem this invention addresses is: how to improve the installation efficiency of welding fixtures on flat wire stator production lines.

[0005] To solve the above problems, this utility model provides a tightening device.

[0006] This utility model provides a tightening device, including a base, a drive mechanism, and multiple torque transmission mechanisms. The drive mechanism includes a first drive member disposed on the base, a drive gear connected to the first drive member, and a transmission gear rotatably connected to the base. The transmission gear has an external tooth structure and an internal tooth structure. The drive gear meshes with the external tooth structure. The multiple torque transmission mechanisms are distributed circumferentially on the base along the transmission gear and respectively mesh with the internal tooth structure. The first drive member is used to drive the transmission gear to rotate through the drive gear and drive the multiple torque transmission mechanisms to rotate synchronously to output tightening torque.

[0007] Optionally, the torque transmission mechanism includes a tightening shaft, a driven member connected to the tightening shaft, and a fixed bracket connected to the base. The lower end of the tightening shaft is used to connect the part to be tightened. The driven member is sleeved outside the tightening shaft and rotatably connected to the fixed bracket. The driven member meshes with the internal gear structure.

[0008] Optionally, the torque transmission mechanism further includes a transmission component, which is sleeved outside the tightening shaft. The end faces of the two axial ends of the transmission component are respectively in contact with the driven component and the tightening shaft. Torque is transmitted between the driven component and the transmission component, and between the transmission component and the tightening shaft, through friction.

[0009] Optionally, the torque transmission mechanism further includes an adjustment component and a first bearing. The upper end of the tightening shaft is rotatably connected to the adjustment component via the first bearing. The adjustment component is used to adjust the frictional force between the driven member and the transmission member, and between the transmission member and the tightening shaft.

[0010] Optionally, the adjusting assembly includes a housing, a spring, and an adjusting member. The housing is connected to the base, and the upper end of the tightening shaft is rotatably connected to the housing via the first bearing. The spring is disposed inside the housing, one end of the adjusting member is located outside the housing, and the other end of the adjusting member is inserted into the housing and abuts against the end of the spring away from the first bearing. The spring is used to apply an elastic force along the axial direction of the tightening shaft to the first bearing when compressed, and the adjusting member is used to move along the axial direction of the tightening shaft to adjust the compression of the spring.

[0011] Optionally, the base includes a third bearing and a first seat body with an annular structure. The transmission gear is rotatably connected to the first seat body through the third bearing. The first seat body is provided with a plurality of first mounting holes, and the fixing brackets of the plurality of torque transmission mechanisms are respectively inserted into the corresponding first mounting holes.

[0012] Optionally, the base includes a base plate and a first seat body, the transmission gear is rotatably connected to the first seat body, the first seat body is rotatably mounted on the base plate, the driving mechanism further includes a second driving member mounted on the base plate, the first seat body is also provided with a meshing block, the second driving member meshes with the meshing block and is used to drive the first seat body to rotate around the axis of the transmission gear through the meshing block.

[0013] Optionally, the tightening device further includes a locking mechanism disposed on the base plate, the locking mechanism being used to lock the first seat onto the base plate.

[0014] Optionally, the locking mechanism includes a gripper structure for clamping the first seat.

[0015] Optionally, the tightening device further includes a positioning mechanism, which includes a telescopic component and a positioning pressure head. One end of the telescopic component passes through the base and is connected to the positioning pressure head. A plurality of torque transmission mechanisms are arranged around the positioning pressure head, and the positioning pressure head is used to insert into the positioning hole on the welding fixture and abut against the welding surface of the welding fixture. The telescopic component is used to drive the positioning pressure head to move axially along the transmission gear.

[0016] The advantages of the tightening device of this utility model are as follows: A first driving component is mounted on a base, a transmission gear is rotatably connected to the base, and multiple torque transmission mechanisms are distributed circumferentially on the base to achieve assembly of the driving mechanism and multiple torque transmission mechanisms on the base. Simultaneously, by setting external and internal gear structures on the transmission gear, and meshing the first driving component with the external gear structure of the transmission gear, and meshing the multiple torque transmission mechanisms with the internal gear structure of the transmission gear respectively, when tightening the locking points of the welding fixture using the tightening device, the first driving component can drive the transmission gear to rotate via the drive gear, thereby causing the multiple torque transmission mechanisms meshing with the internal gear structure of the transmission gear to rotate synchronously. This achieves simultaneous output of tightening torque to multiple parts to be tightened, thus completing the tightening operation of multiple parts at once. This not only improves the installation efficiency of the welding fixture but also facilitates the control of torque during the tightening process, ensuring the consistency of the output torque. In addition, by forming an external mesh with the external tooth structure of the transmission gear and forming an internal mesh with the internal tooth structure of the transmission gear, the first driving member and the drive gear are located on the outside of the transmission gear. This not only provides a larger arrangement space, but also allows for the use of a smaller first driving member to output torque and a smaller drive gear to transmit torque. This reduces the space and weight occupied by the drive mechanism and lowers production costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the tightening device in an embodiment of the present invention; Figure 2 This is a partial cross-sectional schematic diagram of the base and torque transmission mechanism in an embodiment of this utility model; Figure 3 This is a schematic diagram of the transmission gear in an embodiment of the present invention; Figure 4 This is a structural schematic diagram of the transmission gear from another perspective in an embodiment of this utility model; Figure 5 This is a cross-sectional schematic diagram of the torque transmission mechanism in an embodiment of this utility model; Figure 6 This is an assembly diagram of the base, drive mechanism, and torque transmission mechanism in an embodiment of this utility model; Figure 7 This is a schematic diagram of the structure when the transmission gear is mounted on the base in an embodiment of this utility model; Figure 8 This is a schematic diagram of the base structure in an embodiment of the present utility model; Figure 9 This is a cross-sectional view of the transmission gear mounted on the base in an embodiment of this utility model; Figure 10This is a schematic diagram of the structure of the first seat in an embodiment of the present utility model; Figure 11 This is a schematic diagram of the tightening device at the positioning mechanism in an embodiment of the present invention; Figure 12 This is a schematic diagram of the positioning pressure head in an embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Base; 11. Third bearing; 12. First seat; 121. First annular boss; 1211. First mounting hole; 122. Second annular boss; 123. Meshing block; 124. Fourth annular boss; 13. Second seat; 131. Second mounting hole; 14. Base plate; 15. Flange; 16. Pressure plate; 17. First mounting bracket; 18. Second mounting bracket; 2. Drive mechanism; 21. First driving component; 22. Transmission gear; 221. External gear structure; 222. Internal gear structure; 223. Third annular boss; 23. Drive gear; 3. Torque transmission mechanism; 3 1. Tightening shaft; 32. Driven component; 33. Transmission component; 34. Fixed bracket; 35. Adjustment assembly; 351. Housing; 3511. First housing; 3512. Second housing; 3513. First through hole; 3514. Second through hole; 352. Spring; 353. Adjustment component; 36. First bearing; 37. Second bearing; 4. Locking mechanism; 41. Grip structure; 5. Positioning mechanism; 51. Telescopic assembly; 52. Positioning pressure head; 521. Pressure plate; 5211. Limiting protrusion; 522. Positioning pin; 600. Welding fixture; 610. Positioning hole; 620. Limiting groove. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0020] In the accompanying drawings, the Z-axis represents the vertical position, with the positive direction of the Z-axis representing upward and the negative direction representing downward. It should be noted that the aforementioned representation of the Z-axis is merely for the convenience of describing the invention and for simplification, and does 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, it should not be construed as a limitation of the invention.

[0021] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0022] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0023] In related technologies, welding is a key process for flat wire stators, and the welding quality and efficiency directly affect the capacity and production cost of the entire stator production line. During welding, welding fixtures are typically used to control the overlap of the welded wire leads to improve welding quality. Currently, when installing welding fixtures on the flat wire stator production line, operators use hand-held tightening guns to tighten the locking points of the welding fixtures. However, the welding fixtures have dozens (e.g., 54) locking points, resulting in low efficiency when tightening manually, and significant errors exist in controlling the torque during the tightening process.

[0024] To address the problems existing in the aforementioned related technologies, this utility model provides a tightening device.

[0025] Combination Figure 1 , Figure 2 and Figure 3 As shown, a tightening device according to an embodiment of the present invention includes a base 1, a drive mechanism 2, and multiple torque transmission mechanisms 3. The drive mechanism 2 includes a first drive member 21 disposed on the base 1, a drive gear 23 connected to the first drive member 21, and a transmission gear 22 rotatably connected to the base 1. The transmission gear 22 has an external tooth structure 221 and an internal tooth structure 222. The drive gear 23 meshes with the external tooth structure 221. Multiple torque transmission mechanisms 3 are distributed at intervals along the circumference of the transmission gear 22 on the base 1 and mesh with the internal tooth structure 222 respectively. The first drive member 21 is used to drive the transmission gear 22 to rotate through the drive gear 23 and drive the multiple torque transmission mechanisms 3 to rotate synchronously to output tightening torque.

[0026] It should be noted that, during use, the tightening shaft 31 of the torque transmission mechanism 3 is vertically positioned, i.e., along... Figure 1Since the Z-axis is set in the middle, the axial direction of the transmission gear 22 is also... Figure 1 The Z-axis direction, i.e., the up-down direction.

[0027] Specifically, the base 1 is the supporting component of the tightening device, used to support the drive mechanism 2, the torque transmission mechanism 3, and the locking mechanism 4 (described later). The first drive component 21 of the drive mechanism 2 can be a motor, which is usually fixed to the first mounting bracket 17 (described later) of the base 1 using a bracket structure (not shown in the figure). The drive gear 23 is fixed to the motor shaft. The transmission gear 22 of the drive mechanism 2 is rotatably connected to the first seat 12 (described later) of the base 1. The torque transmission mechanism 3 is used to output tightening torque to the parts to be tightened (i.e., bolts or nuts at the locking points of the welding fixture 600). Since the multiple locking points on the welding fixture 600 are distributed in a circular array, the multiple torque transmission mechanisms 3 are evenly distributed on the base 1 along the circumference of the transmission gear 22 and located within the area enclosed by the transmission gear 22, so as to output tightening torque to multiple parts to be tightened at the same time. The number of torque transmission mechanisms 3 can be the same as or an integer multiple of the number of locking points on the welding fixture 600. For example, if the welding fixture 600 has 54 locking points, the number of torque transmission mechanisms 3 can be set to 18, 27, or 54. Meanwhile, the outer and inner peripheral walls of the transmission gear 22 are respectively provided with external tooth structures 221 and internal tooth structures 222, such as... Figure 3 As shown, the external tooth structure 221 can be located above the internal tooth structure 222, below the internal tooth structure 222, or at the same height as the internal tooth structure 222; no specific limitation is made here. The driving gear 23 meshes with the external tooth structure 221 of the transmission gear 22, and multiple torque transmission mechanisms 3 mesh with the internal tooth structure 222 of the transmission gear 22 respectively.

[0028] In this embodiment, the first driving member 21 is mounted on the base 1, the transmission gear 22 is rotatably connected to the base 1, and multiple torque transmission mechanisms 3 are distributed circumferentially on the base 1 along the transmission gear 22, thereby achieving the assembly of the driving mechanism 2 and multiple torque transmission mechanisms 3 on the base 1. Simultaneously, by providing an external tooth structure 221 and an internal tooth structure 222 on the transmission gear 22, and by meshing the driving gear 23 with the external tooth structure 221 of the transmission gear 22, the multiple torque transmission mechanisms 3 are respectively meshed with the internal tooth structure 221 of the transmission gear 22. With two-phase meshing, when the tightening device is used to tighten the locking points of the welding fixture 600, the first driving component 21 can drive the transmission gear 22 to rotate through the driving gear 23, thereby driving multiple torque transmission mechanisms 3 that mesh with the internal gear structure 222 of the transmission gear 22 to rotate synchronously. This enables the simultaneous output of tightening torque to multiple parts to be tightened, thus completing the tightening operation of multiple parts to be tightened at one time. This not only improves the installation efficiency of the welding fixture 600, but also facilitates the control of torque during the tightening process, ensuring the consistency of the output torque. In addition, the first driving member 21 is externally meshed with the external tooth structure 221 of the transmission gear 22, and the multiple torque transmission mechanisms 3 are internally meshed with the internal tooth structure 222 of the transmission gear 22. This allows the first driving member 21 and the drive gear 23 to be located outside the transmission gear 22, which not only provides a larger arrangement space, but also allows the use of a smaller first driving member 21 to output torque and a smaller drive gear 23 to transmit torque. This reduces the space and weight occupied by the drive mechanism 2 and lowers production costs.

[0029] Optionally, combined Figure 3 As shown, the external gear structure 221 is located above the internal gear structure 222. This not only facilitates the installation of the torque transmission mechanism 3, but also reduces the height of the torque transmission mechanism 3 extending upwards from the transmission gear 22, thereby reducing the Z-axis dimension of the tightening device and facilitating its arrangement.

[0030] Optionally, combined Figure 2 and Figure 5 As shown, the torque transmission mechanism 3 includes a tightening shaft 31, a driven member 32, and a fixed bracket 34 connected to the base 1. The lower end of the tightening shaft 31 is used to connect the part to be tightened. The driven member 32 is sleeved on the tightening shaft 31 and rotatably connected to the fixed bracket 34. The driven member 32 meshes with the internal gear structure 222.

[0031] In this optional embodiment, the fixed bracket 34 can be bolted to, for example, the first base 12 (described later) of the base 1, to achieve the installation of the torque transmission mechanism 3 on the base 1. A second bearing 37 can be used to achieve a rotatable connection between the driven member 32 and the fixed bracket 34. Specifically, the inner and outer rings of the second bearing 37 are connected to the driven member 32 and the fixed bracket 34, respectively. The driven member 32 can be a bushing structure, and its outer peripheral wall is provided with a tooth structure that meshes with the internal tooth structure 222. Torque can be transmitted between the driven member 32 and the tightening shaft 31 through friction. In this case, friction plates or anti-slip structures can be provided between the driven member 32 and the tightening shaft 31 to increase friction. Torque can also be transmitted between the driven member 32 and the tightening shaft 31 through a key structure. In this case, the driven member 32 and the tightening shaft 31 are respectively provided with keyways for accommodating the key structure, so that the driven member 32 and the tightening shaft 31 are fixedly connected through the key structure, thereby allowing them to rotate synchronously. In this way, the torque output by the first driving member 21 can be transmitted sequentially through the driving gear 23 and the transmission gear 22 to the driven members 32 of the multiple torque transmission mechanisms 3, and then to the tightening shafts 31 of the multiple torque transmission mechanisms 3, so as to drive the multiple tightening shafts 31 to rotate synchronously, thereby realizing the simultaneous output of tightening torque to multiple parts to be tightened.

[0032] Optionally, combined Figure 2 and Figure 5 As shown, the torque transmission mechanism 3 also includes a transmission component 33, which is sleeved on the tightening shaft 31. The end faces of the two ends of the transmission component 33 in the axial direction are respectively in contact with the driven component 32 and the tightening shaft 31. Torque is transmitted between the driven component 32 and the transmission component 33 and between the transmission component 33 and the tightening shaft 31 through friction.

[0033] In this optional embodiment, the upper end of the tightening shaft 31 is provided with a shoulder structure, that is, the outer diameter of the upper end of the tightening shaft 31 is larger than the outer diameter of the shaft body in its middle part, so that the tightening shaft 31 has a shaft structure with a large end; the transmission member 33 can be a friction plate disposed between the driven member 32 and the large end of the tightening shaft 31, and is clamped between the upper end face of the driven member 32 and the lower end face of the large end of the tightening shaft 31 to realize the transmission of torque through friction. Compared with the use of a key structure to achieve a fixed connection to transmit torque, it is not necessary to additionally process keyways on the tightening shaft 31 and the driven member 32, thereby simplifying the structure and processing technology of the tightening shaft 31 and the driven member 32. Moreover, this connection method allows the transmission member 33 and the driven member 32 to provide an upward supporting force to the tightening shaft 31, thereby allowing the tightening shaft 31 to be maintained in the installation position for tightening operations.

[0034] Optionally, combined Figure 5As shown, the torque transmission mechanism 3 also includes an adjustment component 35 and a first bearing 36. The upper end of the tightening shaft 31 is rotatably connected to the adjustment component 35 through the first bearing 36. The adjustment component 35 is used to adjust the squeezing force between the driven member 32 and the transmission member 33, and between the transmission member 33 and the tightening shaft 31.

[0035] In this way, the adjusting component 35 can be used to act on the tightening shaft 31, for example, by pressing the tightening shaft 31, to adjust the pressing force between the driven member 32 and the transmission member 33, and between the transmission member 33 and the tightening shaft 31. This adjusts the friction between the driven member 32 and the transmission member 33, and between the transmission member 33 and the tightening shaft 31, thereby adjusting the torque transmitted to the part to be tightened and effectively controlling the torque during the tightening process. Moreover, by rotatably connecting the upper end of the tightening shaft 31 to the adjusting component 35 via the first bearing 36, the adjusting component 35 does not need to rotate with the tightening shaft 31, thus reducing the load during torque transmission and improving transmission efficiency.

[0036] Optionally, combined Figure 2 and Figure 5 As shown, the adjustment assembly 35 includes a housing 351, a spring 352, and an adjustment member 353. The housing 351 is connected to the base 1. The upper end of the tightening shaft 31 is rotatably connected to the housing 351 via a first bearing 36. The spring 352 is disposed inside the housing 351. One end of the adjustment member 353 is located outside the housing 351, and the other end of the adjustment member 353 is inserted into the housing 351 and abuts against the end of the spring 352 away from the first bearing 36. The spring 352 is used to apply an elastic force along the axial direction of the tightening shaft 31 to the first bearing 36 when compressed. The adjustment member 353 is used to move along the axial direction of the tightening shaft 31 to adjust the compression amount of the spring 352.

[0037] In this optional embodiment, the spring 352 can be a disc spring or a common helical spring, which can be selected according to the needs in actual application. When the housing 351 is a single-layer housing structure, the lower end of the housing 351 has an opening, and the lower end of the spring 352 extends from the opening and directly abuts against the upper end of the first bearing 36; when the housing 351 is a double-layer housing structure including a first housing 3511 and a second housing 3512 as described later, the lower end of the spring 352 abuts against the second housing 3512, and the lower end of the second housing 3512 abuts against the first bearing 36, that is, the spring 352 applies a downward compressive force to the tightening shaft 31 through the second housing 3512 and the first bearing 36. The adjusting member 353 can be an adjusting bolt. In this case, the upper end of the housing 351 is provided with a threaded hole or nut, and the adjusting member 353 is installed in the threaded hole or nut at the upper end of the housing 351 by means of a threaded connection, and the end of the adjusting member 353 inserted into the housing 351 abuts against the upper end of the spring 352. Thus, when it is necessary to adjust the compressive force applied to the tightening shaft 31, the length of the adjusting member 353 inserted into the housing 351 can be increased or decreased by turning the adjusting member 353, thereby changing the extension and contraction of the spring 352, and thus adjusting the compressive force between the driven member 32 and the transmission member 33 and between the transmission member 33 and the tightening shaft 31, thereby adjusting the torque transmitted to the part to be tightened.

[0038] Furthermore, combined Figure 5 As shown, the adjustment assembly 35 also includes a pin (not shown in the figure). The housing 351 includes a first housing 3511 and a second housing 3512. The first housing 3511 covers the second housing 3512 and is detachably connected to the base 1. The spring 352 is disposed inside the second housing 3512. The first housing 3511 and the second housing 3512 are respectively provided with a first through hole 3513 and a second through hole 3514 arranged coaxially. One end of the pin passes through the first through hole 3513 and is inserted into the second through hole 3514. The first housing 3511 can be fixed to the base 1, for example, the second seat 13 (described later) by bolts. In this way, when disassembling the adjustment assembly 35, it is only necessary to disconnect the connection between the first housing 3511 and the base 1 to remove the entire adjustment assembly 35 together, thereby preventing the second housing 3512 and the spring 352 located inside the first housing 3511 from falling off and being lost during the disassembly process.

[0039] Optionally, combined Figure 4 , Figures 7 to 10 As shown, the base 1 includes a third bearing 11 and a first seat 12 with an annular structure. The transmission gear 22 is rotatably connected to the first seat 12 through the third bearing 11. The first seat 12 is provided with a plurality of first mounting holes 1211. The fixing brackets 34 of the plurality of torque transmission mechanisms 3 are respectively inserted into the corresponding first mounting holes 1211.

[0040] In this optional embodiment, the inner peripheral wall of the first base 12 is provided with a first annular boss 121, and a first mounting hole 1211 is provided on the first annular boss 121. The fixing bracket 34 can be fixed with bolts at the first mounting hole 1211 of the first annular boss 121, and the tightening shaft 31 passes through the corresponding first mounting hole 1211. The inner peripheral wall of the first base 12 is also provided with a second annular boss 122, and the outer peripheral wall of the transmission gear 22 is provided with a third annular boss 223. The second annular boss 122 and the third annular boss 223 are respectively located at the two axial ends of the third bearing 11, and the outer ring and inner ring of the third bearing 11 are respectively connected to the second annular boss 122 and the third annular boss 223. In this way, by setting a third bearing 11 between the transmission gear 22 and the first base 12, the transmission gear 22 and the first base 12 can be rotated using the third bearing 11, ensuring that the transmission gear 22 can rotate relative to the first base 12; moreover, by setting a plurality of first mounting holes 1211 on the first base 12, a mounting position is provided for a plurality of torque transmission mechanisms 3, thereby realizing the mounting and fixing of a plurality of torque transmission mechanisms 3 on the base 1.

[0041] Furthermore, the base 1 also includes a first mounting bracket 17, with the first seat 12 connected to the upper end of the first mounting bracket 17, and the first mounting bracket 17 is used to fix the welding fixture 600 to the workbench of the production line. In this way, the tightening device is installed and fixed at the welding station of the production line.

[0042] Furthermore, combined Figures 6 to 8 As shown, the base 1 also includes a second seat 13 disposed on the first annular boss 121. The second seat 13 has a plurality of second mounting holes 131, which are coaxially arranged with a plurality of first mounting holes 1211. The adjusting components 35 of the plurality of torque transmission mechanisms 3 are respectively disposed at the corresponding second mounting holes 131 and connected to the second seat 13. Specifically, the housing 351 of the adjusting component 35 can be fixed with bolts at the second mounting holes 131 of the second seat 13. In this way, the second seat 13 provides an installation position for the adjusting component 35, preventing the adjusting component 35 from rotating or moving axially during tightening.

[0043] Furthermore, combined Figure 8 and Figure 9 As shown, the base 1 also includes a pressure plate 16 detachably connected to the first base body 12. The upper and lower ends of the third bearing 11 abut against the pressure plate 16 and the second annular boss 122, respectively. In this way, the pressure plate 16 and the second annular boss 122 are used to axially limit the third bearing 11, preventing the third bearing 11 from axially displacing during the tightening process and affecting the tightening effect.

[0044] Optionally, combined Figure 6 and Figure 7 As shown, the base 1 also includes a base plate 14, the first seat body 12 is rotatably connected to the base plate 14, the drive mechanism 2 also includes a second drive member (not shown in the figure) disposed on the base plate 14, the first seat body 12 is also provided with a meshing block 123, the second drive member meshes with the meshing block 123 and is used to drive the first seat body 12 to rotate around the axis of the transmission gear 22 through the meshing block 123.

[0045] In this optional embodiment, the base plate 14 is a stationary component in the base 1, meaning the base plate 14 is fixed, while the first seat body 12 is rotatably connected to the base plate 14, meaning the first seat body 12 can rotate relative to the base plate 14. Furthermore, the outer peripheral wall of the first seat body 12 is provided with a meshing block 123, which can be an arc-shaped structure with teeth, or an arc-shaped rack; the second driving component can be a motor, and the motor shaft of the motor is a gear shaft, which meshes with the teeth on the meshing block 123. In this way, when the number of locking points on the welding fixture 600 is an integer multiple of the torque transmission mechanism 3, after the multiple torque transmission mechanisms 3 have completed the tightening operation of a group of parts to be tightened, the second driving member drives the meshing block 123 to rotate, thereby causing the first seat 12 to rotate around the axis of the transmission gear 22. This changes the tightening position of the multiple torque transmission mechanisms 3 installed on the first seat 12, so that the multiple torque transmission mechanisms 3 are aligned with the second group of parts to be tightened, so as to facilitate the tightening operation of the second group of parts to be tightened, until all parts to be tightened are fastened. Moreover, this allows the tightening device to be applied to welding fixtures 600 with different numbers of locking points, improving the versatility of the tightening device.

[0046] Optionally, combined Figure 1 As shown, the tightening device also includes a locking mechanism 4 disposed on the base plate 14, which is used to lock the first seat 12 onto the base plate 14.

[0047] In this optional embodiment, the locking mechanism 4 is mounted on the fixed base plate 14. The locking mechanism 4 can lock the first seat 12 using the gripper structure 41 described later, or it can lock the first seat 12 using the cooperation of a pin and a pin hole. That is, multiple first pin holes are provided on the first seat 12, and second pin holes are provided on the base plate 14. After adjusting the rotation angle of the first seat 12 and aligning the second pin hole with one of the first pin holes, the pin is inserted into the aligned first and second pin holes in sequence to restrict the rotation of the first seat 12. In this way, the multiple torque transmission mechanisms 3 mounted on the first seat 12 are prevented from rotating around the axis of the transmission gear 22 during the tightening process, thereby improving the reliability of the tightening operation.

[0048] Optionally, combined Figure 1As shown, the locking mechanism 4 includes a gripper structure 41, which is used to clamp the first base 12 axially. In this way, the rotation angle of the multiple torque transmission mechanisms 3 mounted on the first base 12 around the axis of the transmission gear 22 can be infinitely adjusted within a preset angle range, thereby improving the adjustment accuracy.

[0049] Furthermore, combined Figure 1 , Figure 8 and Figure 9 As shown, the base 1 also includes a flange 15, which is sleeved on the first base 12 and detachably connected to it. A clamping structure 41 is used to clamp the flange 15 to lock the first base 12. Specifically, the flange 15 may be annular. The outer peripheral wall of the first base 12 is provided with a fourth annular boss 124 for mounting the flange 15. The flange 15 can be mounted on the fourth annular boss 124 of the first base 12 using fasteners such as bolts. After adjusting the rotation angle of the multiple torque transmission mechanisms 3, the clamping structure 41 of the locking mechanism 4 can be used to clamp the flange 15, fixing the flange 15 and the first base 12 in place, thereby locking the first base 12. In this way, by setting the flange 15 to lock the first seat 12, on the one hand, the outer diameter of the first seat 12 can be reduced, reducing the processing difficulty of the first seat 12; on the other hand, it is convenient to replace the flange 15 of different thicknesses to lock the first seat 12 according to actual needs, thereby improving the versatility of the tightening device.

[0050] Optionally, combined Figure 1 and Figure 11 As shown, the tightening device also includes a positioning mechanism 5, which includes a telescopic component 51 and a positioning head 52. One end of the telescopic component 51 passes through the base 1 and is connected to the positioning head 52. Multiple torque transmission mechanisms 3 are arranged around the positioning head 52. The positioning head 52 is used to insert into the positioning hole 610 on the welding fixture 600 and abut against the welding fixture 600. The telescopic component 51 is used to drive the positioning head 52 to move axially along the transmission gear 22.

[0051] In this optional embodiment, the telescopic component 51 can be fixed to the workbench of the welding fixture 600 via the second mounting bracket 53, for example, fixed to a column on the workbench, so as to install and fix the positioning mechanism 5 at the welding station of the production line. The positioning mechanism 5 can be a press, in which case the telescopic component 51 is a hydraulic cylinder, and the positioning pressure head 52 is connected to the telescopic end of the telescopic component 51. The first seat 12, the second seat 13 and the base plate 1 are all provided with through holes at their center positions. One end of the telescopic component 51 connected to the positioning pressure head 52 passes through the through holes on the second seat 13, the first seat 12 and the base plate 14 in sequence and extends to a position close to the welding surface of the welding fixture 600 (i.e., the upper end surface of the welding fixture 600). In this way, before the tightening operation, the telescopic component 51 can be used to drive the positioning head 52 to move downward into the positioning hole 610 of the welding fixture 600, so as to ensure that the tightening shafts 31 of the multiple torque transmission mechanisms 3 can be aligned with the multiple locking points on the welding fixture 600 respectively, and at the same time, the positioning head 52 abuts against the welding surface of the welding fixture 600 to press the welding fixture 600 and prevent the welding fixture 600 from rotating during the tightening process.

[0052] Optionally, combined Figure 11 and Figure 12 As shown, the positioning head 52 includes a pressure plate 521 and a positioning post 522. The positioning post 522 is used to be inserted into the positioning hole 610. The pressure plate 521 is provided with a limiting protrusion 5211. The welding fixture 600 is provided with a limiting groove 620. The limiting protrusion 5211 is used to be inserted into the limiting groove 620.

[0053] In this optional embodiment, since the welding surface of the welding fixture 600 is typically provided with multiple circularly arranged limiting grooves 620, and these multiple limiting grooves 620 surround the positioning hole 610, the pressure plate 521 can correspondingly be provided with multiple circularly arranged limiting protrusions 5211, and these multiple limiting protrusions 5211 surround the positioning post 522. When the telescopic component 51 drives the positioning pressure head 52 to move downward so that the positioning post 522 is inserted into the positioning hole 610 of the welding fixture 600, and the positioning pressure head 52 abuts against the welding surface of the welding fixture 600, the multiple limiting protrusions 5211 on the pressure plate 521 are respectively inserted into the corresponding limiting grooves 620 on the welding fixture 600. In this way, the limiting effect between the limiting protrusions 5211 and the limiting grooves 620 is used to further improve the connection strength between the pressure plate 521 and the welding fixture 600, ensuring that the welding fixture 600 will not rotate during the tightening process.

[0054] Furthermore, combined Figure 11 As shown, the telescopic component 51, the positioning pressure head 52, and the transmission gear 22 are arranged coaxially. This reduces the radial dimension of the transmission gear 22 and even the tightening device, thereby reducing the space occupied by the tightening device and facilitating its arrangement.

[0055] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A tightening device, characterized in that, The device includes a base (1), a drive mechanism (2), and multiple torque transmission mechanisms (3). The drive mechanism (2) includes a first drive member (21) disposed on the base (1), a drive gear (23) connected to the first drive member (21), and a transmission gear (22) rotatably connected to the base (1). The transmission gear (22) has an external tooth structure (221) and an internal tooth structure (222). The drive gear (23) meshes with the external tooth structure (221). Multiple torque transmission mechanisms (3) are distributed on the base (1) at intervals along the circumference of the transmission gear (22) and mesh with the internal tooth structure (222) respectively. The first drive member (21) is used to drive the transmission gear (22) to rotate through the drive gear (23) and drive the multiple torque transmission mechanisms (3) to rotate synchronously to output tightening torque.

2. The tightening device according to claim 1, characterized in that, The torque transmission mechanism (3) includes a tightening shaft (31), a driven member (32) connected to the tightening shaft (31), and a fixed bracket (34) connected to the base (1). The lower end of the tightening shaft (31) is used to connect the part to be tightened. The driven member (32) is sleeved on the tightening shaft (31) and rotatably connected to the fixed bracket (34). The driven member (32) meshes with the internal gear structure (222).

3. The tightening device according to claim 2, characterized in that, The torque transmission mechanism (3) further includes a transmission component (33), which is sleeved on the tightening shaft (31). The end faces of the two axial ends of the transmission component (33) are respectively in contact with the driven component (32) and the tightening shaft (31). Torque is transmitted between the driven component (32) and the transmission component (33) and between the transmission component (33) and the tightening shaft (31) through friction.

4. The tightening device according to claim 3, characterized in that, The torque transmission mechanism (3) further includes an adjustment component (35) and a first bearing (36). The upper end of the tightening shaft (31) is rotatably connected to the adjustment component (35) through the first bearing (36). The adjustment component (35) is used to adjust the friction between the driven member (32) and the transmission member (33) and between the transmission member (33) and the tightening shaft (31).

5. The tightening device according to claim 4, characterized in that, The adjustment assembly (35) includes a housing (351), a spring (352), and an adjustment member (353). The housing (351) is connected to the base (1). The upper end of the tightening shaft (31) is rotatably connected to the housing (351) via the first bearing (36). The spring (352) is disposed inside the housing (351). One end of the adjustment member (353) is located outside the housing (351), and the other end of the adjustment member (353) is inserted into the housing (351) and abuts against the end of the spring (352) away from the first bearing (36). The spring (352) is used to apply an elastic force along the axial direction of the tightening shaft (31) to the first bearing (36) when compressed. The adjustment member (353) is used to move along the axial direction of the tightening shaft (31) to adjust the compression amount of the spring (352).

6. The tightening device according to claim 2, characterized in that, The base (1) includes a third bearing (11) and a first seat (12) in a ring structure. The transmission gear (22) is rotatably connected to the first seat (12) through the third bearing (11). The first seat (12) is provided with a plurality of first mounting holes (1211). The fixing brackets (34) of the plurality of torque transmission mechanisms (3) are respectively inserted into the corresponding first mounting holes (1211).

7. The tightening device according to claim 1, characterized in that, The base (1) includes a base plate (14) and a first seat body (12). The transmission gear (22) is rotatably connected to the first seat body (12). The first seat body (12) is rotatably mounted on the base plate (14). The drive mechanism (2) also includes a second drive member mounted on the base plate (14). The first seat body (12) is also provided with a meshing block (123). The second drive member meshes with the meshing block (123) and is used to drive the first seat body (12) to rotate around the axis of the transmission gear (22) through the meshing block (123).

8. The tightening device according to claim 7, characterized in that, It also includes a locking mechanism (4) disposed on the base plate (14), the locking mechanism (4) being used to lock the first seat (12) onto the base plate (14).

9. The tightening device according to claim 8, characterized in that, The locking mechanism (4) includes a gripper structure (41) for clamping the first seat (12).

10. The tightening device according to any one of claims 1-9, characterized in that, It also includes a positioning mechanism (5), which includes a telescopic component (51) and a positioning head (52). One end of the telescopic component (51) passes through the base (1) and is connected to the positioning head (52). A plurality of torque transmission mechanisms (3) are arranged around the positioning head (52). The positioning head (52) is used to insert into the positioning hole (610) on the welding fixture (600) and abut against the welding fixture (600). The telescopic component (51) is used to drive the positioning head (52) to move axially along the transmission gear (22).

Images