Tightening mechanism and tightening device

Abstract

The application discloses a tightening mechanism and a tightening device, and relates to the technical field of battery production equipment. The tightening mechanism comprises a connecting piece, a variable-distance driving module and a pressing piece tightening integrated mechanism. The pressing piece tightening integrated mechanism is arranged on the connecting piece and comprises a mounting piece, a first driver, a second driver, a pressing piece, a tightening structure and a positioning structure. The mounting piece is arranged on the connecting piece, the variable-distance driving module drives the mounting piece to move in the horizontal direction relative to the connecting piece, the pressing piece is arranged at the bottom of the mounting piece and is configured to press the product, the tightening structure is arranged on the mounting piece, the second driver drives the tightening structure to ascend and descend in the vertical direction relative to the mounting piece, the tightening mechanism has a rotatable tightening head which is configured to tighten the bolt on the product, and the positioning structure is configured to position the product before the pressing piece presses the product. The application provides the tightening mechanism which is compatible with different products, so that the cost of equipment reconfiguration is reduced, and the purpose of quick and efficient changeover is achieved.

Description

Technical Field

[0001] This application relates to the field of battery production equipment technology, and in particular to a tightening mechanism and tightening device. Background Technology

[0002] With the rapid development of the new energy power battery industry, the production process of power batteries has become increasingly advanced and sophisticated, and various processes have also placed higher demands on the production technology of the lithium battery industry. For example, in battery production, a cover needs to be attached to the casing.

[0003] In related technologies, for the locking of the top cover, during the process of tightening the bolts, the top cover is first pressed with a pressure piece. However, related technologies require the pressure piece to be customized according to the shape and size of the top cover, which not only makes the structure complex, but also increases the manufacturing time, the time for remodeling and reconstruction, and the equipment cost. Summary of the Invention

[0004] In view of the above problems, this application provides a tightening mechanism and a tightening device, which aims to provide a tightening mechanism that is compatible with different products, so as to reduce the cost of equipment changeover and reconstruction, and achieve the purpose of fast and efficient changeover.

[0005] This application provides a tightening mechanism, including a connector, a variable pitch drive module, and a clamping tightening integrated mechanism. The clamping tightening integrated mechanism is disposed on the connector and includes a mounting member, a first driver, a second driver, a clamping member, a tightening structure, and a positioning structure. The mounting member is disposed on the connector, and the variable pitch drive module drives the mounting member to move horizontally relative to the connector. The first driver is disposed on the mounting member and drives the mounting member to move vertically relative to the connector. The second driver is disposed on the mounting member. The clamping member is disposed at the bottom of the mounting member and is configured to clamp the product. The tightening structure is disposed on the mounting member, and the second driver drives the tightening structure to move vertically relative to the mounting member. The tightening mechanism has a rotatable tightening head configured to tighten a bolt onto the product. The positioning structure is configured to position the product before the clamping member clamps the product.

[0006] In the technical solution of this application embodiment, the pressing component and tightening structure are integrated onto the mounting component to form an integral pressing and tightening integrated mechanism. Under the action of the variable pitch drive module and the first driver, the pressing component and tightening structure can move together with the mounting component relative to the connecting component in the horizontal direction and rise and fall in the vertical direction, realizing a follow-up point pressing method in which the pressing component follows the movement of the tightening structure. This design allows the product to be positioned in a preset position by the positioning structure under the movement of the pressing and tightening integrated mechanism, and then the pressing component to press the product, so that the pressing component is pressed near the position where the bolt needs to be tightened, so that the bolt hole on the product can accurately correspond to the bolt on the tightening head. Then, the second driver drives the tightening structure to rise and fall in the vertical direction relative to the mounting component to tighten the bolt onto the product. Therefore, the pressing component can follow the movement of the tightening structure to the vicinity of the position where the bolt needs to be tightened, so as to press it near the position where the bolt needs to be tightened, without the need to customize the conforming pressing component according to the shape and size of the product, realizing the simplification of the structure and the compatibility effect, reducing the cost of equipment changeover and reconstruction, and achieving the purpose of fast and efficient changeover.

[0007] In some embodiments, the clamping member has a front side away from the connector, and the front side of the clamping member is provided with an inclined surface, which is configured to avoid the tightening structure. This design, due to the clamping member's proximity to the tightening structure, avoids interference between the clamping member and the tightening head during the tightening process. Therefore, an inclined surface is provided on the front side of the clamping member to effectively avoid the tightening structure. Furthermore, by designing an inclined surface to avoid the tightening structure, it is unnecessary to provide an excessively large clearance on the front side of the clamping member to prevent deformation of the clamping member caused by an excessively large clearance.

[0008] In some embodiments, the clamping member extends in a direction from close to the connector to far away from the connector. This design increases the clamping area of ​​the clamping member on the product, thereby improving the clamping stability of the clamping member on the product and thus improving the tightening accuracy of the tightening head on the bolt.

[0009] In some embodiments, the bottom of the pressure member is provided with a pressure-increasing section, the area of ​​which gradually increases from top to bottom. This design can further increase the pressing area on the product through the pressure-increasing section, thereby further improving the pressing stability of the pressure member on the product, and allowing the tightening head to tighten the bolts onto the product more smoothly.

[0010] In some embodiments, the pressure boosting section is an insulating and voltage-resistant component. This design, by using an insulating and voltage-resistant component as the pressure boosting section, not only allows the pressure component to maintain a good shape after repeated pressing of the product, resulting in a long service life, but also provides a certain degree of elasticity, which can reduce damage to the product during pressing. In addition, it can also prevent electrical conductivity between the pressure component and the product, thus avoiding potential safety hazards.

[0011] In some embodiments, the positioning structure includes a drive structure, a transmission structure, and a positioning block; the drive structure is disposed on the mounting component; the transmission structure is drively connected to the drive structure; the positioning block is connected to the transmission structure, and the drive structure drives the positioning block to move toward or away from the product through the transmission structure, thereby pushing the product to a preset position. With this design, before the clamping component presses the product, the drive structure first drives the positioning block toward the product through the transmission structure to push the product to a preset position, ensuring that the bolt holes on the product precisely align with the bolts on the tightening head, so that the bolt holes on the product are directly below the bolts. This allows the bolts to be precisely tightened into the bolt holes on the product when the tightening head descends.

[0012] In some embodiments, the positioning block has a clearance groove on the side near the tightening head, which is used to avoid the tightening head. With this design, as the positioning block moves toward the product, it also moves toward the tightening head. Therefore, by designing a clearance groove on the positioning block, the tightening head can be effectively avoided, so as to prevent the positioning block from colliding with the tightening head and causing interference when it moves toward the product.

[0013] In some embodiments, the positioning surface of the positioning block is provided with an insulating and pressure-resistant component. This design, by providing an insulating and pressure-resistant component on the positioning surface of the positioning block so that the insulating and pressure-resistant component contacts the product, not only allows the positioning block to maintain a good shape after repeated pushing of the product, thus extending the service life of the positioning block, but also provides the insulating and pressure-resistant component with a certain degree of elasticity, which can reduce damage to the product during pushing. In addition, it can also prevent electrical conduction between the positioning block and the product, thus avoiding safety hazards.

[0014] In some embodiments, at least two clamping members are provided, and the at least two clamping members are respectively disposed on opposite sides of the tightening head. This design, by providing clamping members on both opposite sides of the tightening head, allows the product to be simultaneously pressed by at least two clamping members on both sides before the tightening head tightens the bolt. This improves the clamping balance of the product and avoids the phenomenon of warping or deformation that occurs when only one side of the bolt hole is tightened. Therefore, it not only improves the clamping stability of the product, but also reduces damage to the product.

[0015] In some embodiments, the mounting component includes a first mounting component and a second mounting component; the first mounting component is connected to the connector, and a tightening structure is disposed on the first mounting component; the second mounting component is connected to the bottom of the first mounting component and is disposed at an angle to the first mounting component; a pressure member is connected to the second mounting component. This design, by using the first and second mounting components disposed at an angle to install the tightening structure and the pressure member respectively, makes it easier to install the tightening structure and the pressure member.

[0016] In some embodiments, the pressure member is connected to the second mounting member via a connecting guide rod; a buffer is provided between the connecting guide rod and the second mounting member. This design, by providing a buffer between the connecting guide rod and the second mounting member, allows the buffer to provide cushioning force to the pressure member during the product clamping process. This enables the connecting guide rod to move up and down slightly relative to the second mounting member, thereby causing the pressure member to move up and down slightly as well. This reduces the impact force on the product during clamping and prevents damage from excessive clamping force.

[0017] In some embodiments, the second mounting member has a through hole through which the tightening head passes. This design, by having the tightening head extend directly through the through hole of the second mounting member to the bottom of the second mounting member, not only achieves a compact structural design, but also allows for radial limiting of the tightening head through the through hole on the second mounting member, thereby reducing the radial amplitude generated by the tightening head during the tightening of the bolt and improving the accuracy of bolt tightening.

[0018] In some embodiments, the mounting component further includes a pitch-adjustable connector disposed on the connector and movable horizontally relative to the connector; a first mounting component disposed on the pitch-adjustable connector and movable vertically relative to the first mounting component. This design allows for precise position adjustment when the horizontal position of the clamping and tightening structures needs to be adjusted. The pitch-adjustable connector can move the clamping and tightening structures horizontally to the desired location on the product where bolts need to be tightened.

[0019] In some embodiments, a first actuator is located on the side of the first mounting member near the pitch connector and is driven to the pitch connector to drive the first mounting member to move vertically relative to the pitch connector; a second actuator is located on the side of the first mounting member away from the pitch connector and is driven to the tightening structure to drive the tightening structure to move vertically. This design allows the first mounting member, tightening structure, second mounting member, and pressure member to descend vertically simultaneously under the action of the first actuator, so that the pressure member presses against the product's bolt hole and the tightening structure is positioned above the product's bolt hole. Then, under the action of the second actuator, the tightening structure descends vertically to tighten the bolt into the product's bolt hole using the tightening head. Furthermore, by placing the first and second actuators on opposite sides of the first mounting member, a compact design can be achieved, improving space utilization.

[0020] In some embodiments, the first driver is driven to the pitch connector via a first floating joint; and / or, the tightening structure is driven to the second driver via a second floating joint. This design allows the first driver to transmit power to the pitch connector via the first floating joint when outputting power. Since the pitch connector is connected to the connecting parts of the entire machine, it does not move relative to the connecting parts in the vertical direction. This allows the first mounting part to move vertically relative to the pitch connector, thereby causing the tightening structure, the second mounting part, and the pressure member to move vertically. Furthermore, the design of the first floating joint provides cushioning and vibration damping, resulting in greater stability of the first mounting part during lifting. When the second driver outputs power, it transmits power to the tightening structure via the second floating joint, causing the tightening structure to move vertically. Again, the design of the second floating joint provides cushioning and vibration damping, resulting in greater stability of the tightening structure during lifting.

[0021] In some embodiments, the tightening structure includes a tightening connector, a tightening gun, a positioner, and a nail feeder. The tightening connector is disposed on the mounting component; the tightening gun is disposed on the tightening connector and is equipped with a tightening head; the positioner is disposed on the tightening connector and configured to acquire the tightening position of the product; the nail feeder is sleeved on the tightening head and configured to supply bolts to the tightening head. This design allows bolts to be automatically fed to the nail feeder via an external automatic nail feeding system, enabling automatic bolt delivery. The positioner is designed to photograph and locate the tightening position of the product, thereby precisely controlling the clamping position of the clamping component and the bolt tightening position of the tightening head.

[0022] In some embodiments, the tightening connector includes a clamping element configured to hold the tightening gun; the clamping element also includes a locking mechanism configured to secure the tightening gun. This design allows for reliable installation of the tightening gun by first opening the locking mechanism, then inserting the tightening gun into the clamping element, and finally locking the locking mechanism.

[0023] This application also provides a tightening device, including a transfer mechanism and a tightening mechanism; the tightening mechanism is drivenly connected to the transfer mechanism, and the transfer mechanism drives the tightening mechanism to move.

[0024] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of one embodiment of the tightening mechanism of this application;

[0027] Figure 2 This is a schematic diagram of the structure of the pressure member tightening integrated mechanism from one perspective in one embodiment of the tightening mechanism of this application;

[0028] Figure 3 This is a schematic diagram of the pressure member tightening integrated mechanism from another perspective in one embodiment of the tightening mechanism of this application;

[0029] Figure 4 This is a front view of the pressure member tightening integrated mechanism in one embodiment of the tightening mechanism of this application;

[0030] Figure 5 This is an exploded view of the pressure member tightening integrated mechanism in one embodiment of the tightening mechanism of this application;

[0031] Figure 6 This is a partial structural schematic diagram of the pressure member tightening integrated mechanism in one embodiment of the tightening mechanism of this application;

[0032] Figure 7 This is a partial structural cross-sectional view of the pressure member tightening integrated mechanism in one embodiment of the tightening mechanism of this application;

[0033] Figure 8 This is a schematic diagram of the structure of one embodiment of the tightening device of this application;

[0034] Figure 9 for Figure 8 The left view in the middle;

[0035] Figure 10 for Figure 8 The top view in the image.

[0036] Explanation of icon numbers:

[0037]

[0038] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0039] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0044] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width and / or height," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0045] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0046] With the rapid development of the new energy power battery industry, the production process of power batteries has become increasingly advanced and sophisticated, and various processes have also placed higher demands on the production technology of the lithium battery industry. For example, in battery production, a cover needs to be attached to the casing.

[0047] In related technologies, for the locking of the top cover, during the process of tightening the bolts, the top cover is first pressed with a pressure piece. However, related technologies require the pressure piece to be customized according to the shape and size of the top cover, which not only makes the structure complex, but also increases the manufacturing time, the time for remodeling and reconstruction, and the equipment cost.

[0048] Based on the above problems, this application proposes a tightening mechanism 100, which aims to provide a tightening mechanism 100 compatible with different products 300, so as to reduce the cost of equipment changeover and reconstruction, and achieve the purpose of fast and efficient changeover. The following detailed description is provided in conjunction with specific accompanying drawings and embodiments.

[0049] Please see Figures 1 to 7 In one embodiment of this application, the tightening mechanism 100 includes a connector 10, a variable pitch drive module 11, and a pressure member tightening integrated mechanism 20. The pressure member tightening integrated mechanism 20 is disposed on the connector 10 and includes a mounting member 21, a first driver 24, a second driver 25, a pressure member 22, a tightening structure 23, and a positioning structure 210. The mounting member 21 is disposed on the connector 10, and the variable pitch drive module 11 drives the mounting member 21 to move horizontally relative to the connector 10. The first driver 24 is disposed on the mounting member 21 and drives the mounting member 21 to move horizontally relative to the connector 10. Mounting member 21 moves vertically relative to connecting member 10; second actuator 25 is provided on mounting member 21; clamping member 22 is provided at the bottom of mounting member 21 and is configured to clamp product 300; tightening structure 23 is provided on mounting member 21, and second actuator 25 drives tightening structure 23 to move vertically relative to mounting member 21, tightening mechanism 100 has a rotatable tightening head 2321, tightening head 2321 is configured to tighten bolt 400 onto product 300; positioning structure 210 is configured to position product 300 before clamping product 300 by clamping member 22.

[0050] The connector 10 is a structural component used to install and fix the tightening integrated mechanism 20, and also to install the tightening mechanism 100 as a whole onto the transfer mechanism 200 or other mechanical drive equipment. The connector 10 can be a plate-shaped, strip-shaped, or block-shaped structural component. The tightening integrated mechanism 20 can be installed on the side of the connector 10 away from the transfer mechanism 200 or other mechanical drive equipment to facilitate convenient installation.

[0051] The clamping and tightening integrated mechanism 20 is an integrated mechanism for integrating the clamping component 22 and the tightening structure 23 together on the mounting component 21. This allows the clamping component 22 and the tightening structure 23 to move together with the mounting component 21 relative to the connecting component 10 in the horizontal direction and in the vertical direction, realizing a follow-up point pressing method in which the clamping component 22 follows the movement of the tightening structure 23. Specifically, when the clamping component 22 and the tightening structure 23 move together relative to the connecting component 10 in the horizontal direction, the positions of the clamping component 22 and the tightening structure 23 can be adjusted. For example, when there are two or more clamping and tightening integrated mechanisms 20 on the connecting component 10, the distance between two adjacent clamping and tightening integrated mechanisms 20 can be adjusted during the horizontal movement relative to the connecting component 10 to achieve variable pitch compatibility for different tightening positions. In addition, while the clamping member 22 and the tightening structure 23 move together in the horizontal direction and rise and fall in the vertical direction relative to the connecting member 10, the tightening structure 23 can also rise and fall in the vertical direction relative to the mounting member 21 and the clamping member 22, so that the tightening structure 23 can tighten the bolt 400 onto the product 300.

[0052] Among them, the variable pitch drive module 11 is a structural component with a power source such as a cylinder or a motor, which can drive the mounting component to move in the horizontal direction when outputting the power source, thereby driving the tightening structure 23 and the pressure component 22 to move in the horizontal direction.

[0053] The first driver 24 is also a structural component with a power source, such as a cylinder or a motor, which can drive the mounting component 21 to rise and fall in the vertical direction when outputting the power source, thereby driving the tightening structure 23 and the pressure component 22 to rise and fall in the vertical direction.

[0054] The second driver 25 is also a structural component with a power source, such as a cylinder or a motor, which can drive the tightening structure 23 to move up and down in the vertical direction when outputting the power source.

[0055] Among them, the pressure member 22 is a structural component used to press the product 300 before the tightening structure 23 tightens the bolt 400. For example, when the pressure member 22 descends, it can press the product 300 near the position where the bolt needs to be tightened, so as to prevent the product 300 from shifting position during the tightening structure 23 tightening the bolt 400, which would affect the tightening effect or even damage the product 300.

[0056] Among them, the tightening structure 23 is a structural component including a tightening gun 232. The end of the tightening gun 232 is provided with a tightening head 2321. The tightening gun 232 can drive the tightening head 2321 to rotate, and the bolt 400 can be tightened onto the product 300 under the rotation of the tightening head 2321.

[0057] The positioning structure 210 is a structural component used to position the product 300 in a preset position. The positioning structure 210 can position the product 300 in the preset position by means of pushing, clamping, or other methods.

[0058] In summary, the technical solution of this application embodiment integrates the pressure member 22 and the tightening structure 23 onto the mounting member 21 to form an integral pressure member tightening integrated mechanism 20. Under the action of the variable pitch drive module 11 and the first driver 24, the pressure member 22 and the tightening structure 23 can move together with the mounting member 21 relative to the connecting member 10 in the horizontal direction and rise and fall in the vertical direction, realizing the follow-up point pressure mode of the pressure member 22 following the movement of the tightening structure 23. This design allows the product 300 to be positioned in a preset position by the positioning structure 210 under the movement of the pressure member tightening integrated mechanism 20, and then the pressure member 22 to press the product 300, so that the pressure member 22 is pressed near the position where the bolt needs to be tightened, so that the bolt hole on the product 300 can accurately correspond to the bolt 400 on the tightening head 2321. Then, the second driver drives the tightening structure 23 to rise and fall in the vertical direction relative to the mounting member 21 to tighten the bolt 400 onto the product 300. Therefore, the clamping component 22 can follow the tightening structure 23 to the vicinity of the bolt position to be tightened, so as to press it in the vicinity of the bolt position. There is no need to customize the clamping component 22 according to the shape and size of the product 300, which simplifies the structure and achieves compatibility, reduces the cost of equipment changeover and reconstruction, and achieves the purpose of fast and efficient changeover.

[0059] Please see Figure 2 , Figure 3 In one embodiment of this application, the pressure member 22 has a front side away from the connector 10, and the front side of the pressure member 22 is provided with an inclined surface 221, which is configured to avoid the tightening structure 23.

[0060] The inclined surface 221 refers to the surface formed by the rearward tilt of the front side of the pressure member 22. Specifically, the pressure member 22 can be cut to form the inclined surface 221, or the inclined surface 221 can be formed directly in the mold during preparation.

[0061] In this design, because the pressure member 22 is located adjacent to the tightening structure 23, an inclined surface 221 is provided on the front side of the pressure member 22 to avoid interference between the tightening head 2321 and the pressure member 22 during the tightening of the bolt 400. This inclined surface 221 effectively avoids the tightening structure 23. In addition, by designing the inclined surface 221 to avoid the tightening structure 23, it is not necessary to provide an excessively large clearance on the front side of the pressure member 22 to avoid the tightening structure 23, thereby avoiding the problem of deformation of the pressure member 22 caused by an excessively large clearance.

[0062] Please see Figure 2 , Figure 3 In one embodiment of this application, the pressure member 22 extends in a direction from near the connector 10 to away from the connector 10.

[0063] The extension of the pressure member 22 in the direction from near the connector 10 to far away from the connector 10 means that the pressure member 22 is extended in the front-back direction, so that the width of the pressure member 22 in the front-back direction is greater than the width of the tightening head 2321 in the front-back direction.

[0064] This design increases the pressing area of ​​the pressure member 22 on the product 300, thereby improving the pressing stability of the pressure member 22 on the product 300 and thus improving the accuracy of the tightening head 2321 in tightening the bolt 400.

[0065] Please see Figure 2 , Figure 3 In one embodiment of this application, the bottom of the pressure member 22 is provided with a pressure boosting section 222, and the area of ​​the pressure boosting section 222 gradually increases from the top to the bottom.

[0066] The pressure boosting section 222 refers to a structural component that can increase the pressing area of ​​the product 300. The area of ​​the pressure boosting section 222 gradually increases from top to bottom, which means that the outer periphery of the pressure boosting section 222 has a downwardly increasing slope design.

[0067] This design can further increase the pressing area of ​​the product 300 through the design of the pressure boosting section 222, thereby further improving the pressing stability of the pressing component 22 on the product 300, so that the tightening head 2321 can tighten the bolt 400 onto the product 300 more smoothly.

[0068] Please see Figure 2 , Figure 3 In one embodiment of this application, the booster section 222 is an insulating and pressure-resistant component 2032.

[0069] Insulating and pressure-resistant components 2032 refer to structural components made of insulating and pressure-resistant materials, which have the functions of insulation and strong pressure resistance. Specific insulating and pressure-resistant materials can be natural rubber, styrene-butadiene rubber, butyl rubber, fluororubber, ceramic fiber, quartz fiber, etc.

[0070] This design, by using an insulating and pressure-resistant component 2032 as the pressure boosting section 222, not only allows the pressure component 22 to maintain a good shape after repeatedly pressing the product 300, thus extending its service life, but also ensures that the insulating and pressure-resistant component 2032 has a certain degree of elasticity, which can reduce damage to the product 300 when pressing it. In addition, it can also prevent electrical conductivity between the pressure component 22 and the product 300, thus avoiding potential safety hazards.

[0071] Please see Figures 5 to 7 In one embodiment of this application, the positioning structure 210 includes a driving structure 201, a transmission structure 202, and a positioning block 203; the driving structure 201 is disposed on the mounting member 21; the transmission structure 202 is connected to the driving structure 201; the positioning block 203 is connected to the transmission structure 202, and the driving structure 201 drives the positioning block 203 to move toward or away from the product 300 through the transmission structure 202, so as to push the product 300 to a preset position.

[0072] The drive structure 201 is a structural component with a power source, such as a cylinder or a motor, which can drive the positioning block 203 to move through the transmission structure 202 when outputting the power source.

[0073] The transmission structure 202 is a structural component used to connect the positioning block 203 and the drive structure 201. It can transmit the power source output by the drive structure 201 to the positioning block 203 to drive the positioning block 203 to move. The transmission structure 202 can be a structure in which a gear 2021 and a rack 2022 mesh, a structure in which a gear 2021 and a belt mesh, or a structure in which a lead screw and a nut mesh. In some embodiments, the transmission structure 202 can include a gear 2021 and a rack 2022. The gear 2021 is sleeved on the output shaft of the drive structure 201, and the rack 2022 meshes with the gear 2021. The positioning block 203 is connected to the rack 2022. When the drive structure 201 drives the gear 2021 to rotate, the gear 2021 drives the rack 2022 to move. The positioning block 203 can move with the rack 2022 and push the product 300 to push the product 300 to a preset position.

[0074] The positioning block 203 is a structural component that comes into contact with the product 300. The movement of the positioning block 203 can push the product 300 to a preset position.

[0075] In this design, before the clamping component 22 clamps the product 300, the drive structure 201 first drives the positioning block 203 to move toward the product 300 through the transmission structure 202, so as to push the product 300 to the preset position, so that the bolt hole on the product 300 can be precisely aligned with the bolt 400 on the tightening head 2321, so that the bolt hole on the product 300 is located directly below the bolt 400. In this way, when the tightening head 2321 descends, the bolt 400 can be precisely tightened into the bolt hole on the product 300.

[0076] Please see Figures 5 to 7 In one embodiment of this application, the positioning block 203 is provided with a relief groove 2031 on the side near the tightening head 2321, and the relief groove 2031 is used to avoid the tightening head 2321.

[0077] The design of the clearance groove 2031 allows the positioning block 203 to form a U-shaped structure, so that the positioning block 203 can fully avoid the tightening head 2321.

[0078] With this design, as the positioning block 203 moves toward the product 300, it will also move toward the tightening head 2321. Therefore, by designing an avoidance groove 2031 on the positioning block 203, the tightening head 2321 can be effectively avoided, so as to prevent the positioning block 203 from colliding with the tightening head 2321 and interfering when it moves toward the product 300.

[0079] Please see Figures 5 to 7 In one embodiment of this application, the positioning surface of the positioning block 203 is provided with an insulating and pressure-resistant component 2032.

[0080] Insulating and pressure-resistant components 2032 refer to structural components made of insulating and pressure-resistant materials, which have the functions of insulation and strong pressure resistance. Specific insulating and pressure-resistant materials can be natural rubber, styrene-butadiene rubber, butyl rubber, fluororubber, ceramic fiber, quartz fiber, etc.

[0081] This design, by setting an insulating and pressure-resistant component 2032 on the positioning surface of the positioning block 203 so that the insulating and pressure-resistant component 2032 contacts the product 300, not only allows the positioning block 203 to maintain a good shape after repeatedly pushing the product 300, thus extending the service life of the positioning block 203, but also the insulating and pressure-resistant component 2032 has a certain degree of elasticity, which can reduce damage to the product 300 when pushing it. In addition, it can also prevent electrical conductivity between the positioning block 203 and the product 300, thus avoiding safety hazards.

[0082] Please see Figures 1 to 7 In one embodiment of this application, the pressure member 22 is provided with at least two pieces, and the at least two pressure members 22 are respectively disposed on opposite sides of the tightening head 2321.

[0083] This design, by providing pressure members 22 on both sides of the tightening head 2321, allows at least two pressure members 22 on both sides to simultaneously press the product 300 before the tightening head 2321 tightens the bolt 400. This improves the balance of the pressure on the product 300 and avoids warping or deformation when only one side of the bolt hole on the product 300 is pressed. Therefore, it not only improves the stability of the pressure on the product 300 but also reduces damage to the product 300.

[0084] Please see Figure 5 In one embodiment of this application, the mounting component 21 includes a first mounting component 211 and a second mounting component 212; the first mounting component 211 is connected to the connector 10, and the tightening structure 23 is disposed on the first mounting component 211; the second mounting component 212 is connected to the bottom of the first mounting component 211 and is disposed at an angle to the first mounting component 211; the pressure component 22 is connected to the second mounting component 212.

[0085] The first mounting component 211 is a structural component used to install the tightening structure 23 and is connected to the connector 10. The first mounting component 211 can move horizontally and rise vertically relative to the connector 10, thereby causing the tightening structure 23 connected to the first mounting component 211, the second mounting component 212, and the pressure component 22 connected to the second mounting component 212 to move horizontally and rise vertically together. The first mounting component 211 can be a plate-shaped, strip-shaped, or block-shaped structural component.

[0086] The second mounting component 212 is a structural component used to mount the pressure component 22 and is connected to the first mounting component 211. The second mounting component 212 and the first mounting component 211 can be integrally formed structural components, or they can be connected together by screws, snap-fits, or other methods. The pressure component 22 and the second mounting component 212 can also be integrally formed structural components, or they can be connected together by screws, snap-fits, connecting guide rods 224, or other methods. The second mounting component 212 can be a plate-shaped, strip-shaped, or block-shaped structural component.

[0087] This design, by using a first mounting member 211 and a second mounting member 212 arranged at an angle to install the tightening structure 23 and the pressure member 22 respectively, makes it easier to install the tightening structure 23 and the pressure member 22.

[0088] Please see Figure 5 In one embodiment of this application, the pressure member 22 is connected to the second mounting member 212 via a connecting guide rod 224; a buffer member 225 is provided between the connecting guide rod 224 and the second mounting member 212.

[0089] The connecting guide rod 224 is a structural component used to connect the pressure member 22 to the second mounting member 212. The connecting guide rod 224 can be inserted into the mounting hole of the second mounting member 212, so that the connecting guide rod 224 can move up and down relative to the second mounting member 212 in the mounting hole.

[0090] The buffer component 225 is a structural component used to provide a buffering effect. Specifically, the buffer component 225 can be a spring, a sheet, silicone, rubber, or other structural component with a buffering function.

[0091] This design, by setting a buffer 225 between the connecting guide rod 224 and the second mounting member 212, allows the pressure member 22 to provide buffering force to the pressure member 22 through the connecting guide rod 224 during the pressing process of the pressure member 22 on the product 300. This allows the connecting guide rod 224 to move up and down slightly relative to the second mounting member 212, thereby driving the pressure member 22 to move up and down slightly. This reduces the impact force of the pressure member 22 on the product 300 when pressing it and prevents damage to the product 300 due to excessive pressing force.

[0092] Please see Figure 5 In one embodiment of this application, the second mounting member 212 is provided with a through hole 2121, and the tightening head 2321 passes through the through hole 2121.

[0093] This design, by having the tightening head 2321 extend directly through the through hole 2121 of the second mounting member 212 to the bottom of the second mounting member 212, not only achieves a compact design, but also allows for radial limiting of the tightening head 2321 through the through hole 2121 on the second mounting member 212. This reduces the radial amplitude generated by the tightening head 2321 during the tightening of the bolt 400, thereby improving the accuracy of tightening the bolt 400.

[0094] Please see Figure 5 In one embodiment of this application, the mounting member 21 further includes a variable pitch connector 213, which is disposed on the connector 10 and can move horizontally relative to the connector 10; the first mounting member 211 is disposed on the variable pitch connector 213 and can move vertically relative to the first mounting member 211.

[0095] The variable pitch connector 213 is a structural component used to simultaneously install the first mounting component 211, the tightening structure 23, the second mounting component 212, and the pressure component 22 onto the connector 10. When the variable pitch connector 213 moves horizontally relative to the connector 10, it can synchronously drive the first mounting component 211, the tightening structure 23, the second mounting component 212, and the pressure component 22 to move horizontally. The variable pitch connector 213 can be a plate-shaped, strip-shaped, or block-shaped structural component.

[0096] With this design, when it is necessary to adjust the position of the pressure member 22 and the tightening structure 23 in the horizontal direction, the pressure member 22 and the tightening structure 23 can be moved in the horizontal direction by the variable pitch connector 213, so as to move the pressure member 22 and the tightening structure 23 to the position where the bolt 400 needs to be tightened on the product 300, thereby achieving precise position adjustment.

[0097] In some embodiments, the tightening mechanism 100 may include at least two pressure member tightening integrated mechanisms 20, which are spaced apart along the length direction of the connector 10. The pressure member tightening integrated mechanisms 20 can move horizontally relative to the connector 10 along the length direction of the connector 10. Thus, with the movement of the variable pitch connector 213, the distance between two adjacent pressure member tightening integrated mechanisms 20 can be adjusted to achieve variable pitch compatibility at different tightening positions.

[0098] In some embodiments, the connector 10 may be provided with a first guide rail 12, a first slider 13, and a guide rail pad 14. The guide rail pad 14 is connected to the side of the connector 10 near the variable pitch connector 213. The first guide rail 12 is mounted on the guide rail pad 14 and extends along the length of the connector 10. The first slider 13 is slidably engaged with the first guide rail 12, and the variable pitch connector 213 is connected to the first slider 13. Thus, under the action of the variable pitch drive module 11, the first slider 13 can be driven to move horizontally along the first guide rail 12, thereby driving the variable pitch connector 213 to move horizontally.

[0099] Please see Figure 5 In one embodiment of this application, a first driver 24 is disposed on the side of the first mounting member 211 near the pitch connector 213 and is connected to the pitch connector 213 in a driving manner to drive the first mounting member 211 to move up and down in the vertical direction relative to the pitch connector 213; a second driver 25 is disposed on the side of the first mounting member 211 away from the pitch connector 213 and is connected to the tightening structure 23 in a driving manner to drive the tightening structure 23 to move up and down in the vertical direction.

[0100] The first driver 24 is a structural component with a power source, such as a cylinder or a motor. When outputting power, it can drive the first mounting member 211 to move up and down in the vertical direction, thereby driving the tightening structure 23, the second mounting member 212, and the pressure member 22 to move up and down in the vertical direction. In some embodiments, a second guide rail 281 and a second slider 282 can be provided on the side of the variable pitch connector 213 near the first mounting member 211. The second guide rail 281 extends in the vertical direction, and the second slider 282 slides in cooperation with the second guide rail 281. The first mounting member 211 is connected to the second slider 282. In this way, the stability of the first mounting member 211 during the lifting and lowering process can be improved with the cooperation of the second guide rail 281 and the second slider 282.

[0101] The second actuator 25 is also a structural component with a power source, such as a cylinder or a motor, which can drive the tightening structure 23 to move up and down in the vertical direction when outputting power. In some embodiments, a third guide rail 291 and a third slider 292 can be provided on the side of the first mounting member 211 away from the variable pitch connector 213. The third guide rail 291 extends in the vertical direction, and the third slider 292 slides in cooperation with the third guide rail 291. The tightening structure 23 is connected to the third slider 292. In this way, the stability of the tightening structure 23 during the lifting and lowering process can be improved with the cooperation of the third guide rail 291 and the third slider 292.

[0102] This design allows the first mounting component 211, tightening structure 23, second mounting component 212, and pressure component 22 to descend vertically simultaneously under the action of the first driver 24. This causes the pressure component 22 to press against the bolt hole of the product 300, and the tightening structure 23 to be positioned above the bolt hole of the product 300. Then, under the action of the second driver 25, the tightening structure 23 descends vertically to tighten the bolt 400 onto the bolt hole of the product 300 via the tightening head 2321. Furthermore, by positioning the first driver 24 and the second driver 25 on opposite sides of the first mounting component 211, a compact design can be achieved, improving space utilization.

[0103] Please see Figure 5 In one embodiment of this application, the first driver 24 is driven to the variable pitch connector 213 via the first floating joint 26; and / or, the tightening structure 23 is driven to the second driver 25 via the second floating joint 27.

[0104] The first floating joint 26 is used to connect the first driver 24 and the variable pitch connector 213, and has the functions of buffering and vibration reduction, which can improve the dynamic performance of the first driver 24 during power output. The second floating joint 27 is used to connect the second driver 25 and the tightening structure 23, and also has the functions of buffering and vibration reduction, which can improve the dynamic performance of the second driver 25 during power output.

[0105] This design allows the first drive 24 to transmit power to the variable pitch connector 213 via the first floating joint 26 when outputting power. Since the variable pitch connector 213 is connected to the connector 10 of the entire machine, it does not move relative to the connector 10 in the vertical direction. This allows the first mounting member 211 to move vertically relative to the variable pitch connector 213, thereby causing the tightening structure 23, the second mounting member 212, and the pressure member 22 to move vertically. Furthermore, the design of the first floating joint 26 provides cushioning and vibration damping, resulting in greater stability of the first mounting member 211 during lifting. Similarly, when the second drive 25 outputs power, it transmits power to the tightening structure 23 via the second floating joint 27, causing the tightening structure 23 to move vertically. Again, the design of the second floating joint 27 provides cushioning and vibration damping, further enhancing the stability of the tightening structure 23 during lifting.

[0106] Please see Figure 5 In one embodiment of this application, the tightening structure 23 includes a tightening connector 231, a tightening gun 232, a locator 233, and a nail feeder 234; the tightening connector 231 is disposed on the mounting member 21; the tightening gun 232 is disposed on the tightening connector 231 and is provided with a tightening head 2321; the locator 233 is disposed on the tightening connector 231 and is configured to obtain the tightening position of the product 300; the nail feeder 234 is sleeved on the tightening head 2321 and is configured to provide bolts 400 to the tightening head 2321.

[0107] The tightening connector 231 is a structural component used to install the tightening structure 23 as a whole onto the mounting component 21. The tightening connector 231 can be a structural component in the shape of a plate, strip, block, etc.

[0108] The tightening gun 232 is a structural component that outputs tightening power. It is used to provide power for the rotation of the tightening head 2321, thereby driving the bolt 400 to be tightened onto the bolt hole of the product 300 under the rotation of the tightening head 2321.

[0109] Positioner 233 is used to detect the position of bolt holes in product 300 and can transmit signals to the control terminal so that the control terminal can control the clamping tightening integrated mechanism 20 to move to the corresponding position. Positioner 233 can be a CCD camera.

[0110] The nail feeder 234 is a structural component used to provide bolts 400 one by one to the position of the tightening head 2321. The nail feeder 234 is fixedly installed below the second mounting member 212, and the tightening head 2321 can be inserted into the nail feeder 234.

[0111] This design allows for the automatic feeding of bolts 400 to the feeding cylinder 234 via an external automatic feeding system. The feeding cylinder 234 then automatically feeds each bolt 400 to the tightening head 2321, thus achieving automatic feeding of the bolts 400. The positioner 233 is designed to photograph and locate the tightening position of the product 300, thereby precisely controlling the clamping position of the clamping component 22 and the bolt tightening position of the tightening head 2321.

[0112] Please see Figure 5 In one embodiment of this application, the tightening connector 231 is provided with a clamping member 2311, which is configured to clamp the tightening gun 232; the clamping member 2311 is provided with a latch 2312, which is configured to fasten the tightening gun 232.

[0113] The clamping member 2311 is a structural component that secures the tightening gun 232 by clamping. It can be a pawl or two clamping blocks that are close to or far apart from each other. The locking buckle 2312 is a structural component used to lock the tightening gun 232 onto the clamping member 2311.

[0114] With this design, when installing the tightening gun 232, the locking buckle 2312 can be opened first, then the tightening gun 232 can be inserted into the clamping member 2311, and finally the locking buckle 2312 can be fastened to secure the tightening gun 232 onto the clamping member 2311, thus achieving reliable installation of the tightening gun 232.

[0115] Please see Figures 8 to 10 This application also proposes a tightening device 1000, which includes a transfer mechanism 200 and a tightening mechanism 100. The specific structure of the tightening mechanism 100 is as described in the above embodiments. Since this tightening device 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The tightening mechanism 100 is driven by the transfer mechanism 200, and the transfer mechanism 200 drives the tightening mechanism 100 to move.

[0116] Understandably, the transfer mechanism 200 can smoothly drive the tightening mechanism 100 to move as a whole, so that the tightening mechanism 100 can move precisely above the position on the product 300 where the bolt needs to be tightened. The transfer mechanism 200 can be a robotic arm or a transfer mechanism 200 composed of multiple linear modules.

[0117] According to some embodiments of this application, please refer to Figures 1 to 10 The tightening device 1000 provided in this application can tighten the bolt 400 in the following manner:

[0118] First, the bolts 400 are fed into the bolt feeding cylinder 234 via an external bolt feeding system; the handling equipment moves the box and the top cover to the bolt tightening station; the transfer mechanism 200 drives the tightening mechanism 100 to move, so as to take a picture and position the tightening position of the top cover by the positioner 233 in the tightening mechanism 100; the transfer mechanism 200 drives the tightening mechanism 100 to move above the tightening position of the top cover; the variable pitch drive module 11 on the connector 10 works to adjust the spacing between the two sets of pressure member tightening integrated mechanisms 20 on the tightening mechanism 100, so that the two sets of pressure member tightening integrated mechanisms 20 are respectively located above the two tightening positions of the top cover; then, the drive structure 201 of the positioning structure 210 works to drive the gear 2021 to rotate, and the rotation of the gear 2021 drives the rack 2 022 moves forward, thereby driving the positioning block 203 forward via the rack 2022, so that the positioning block 203 moves toward the side of the top cover, pushing the top cover to a preset position, so that the bolt holes on the top cover can precisely align with the bolts 400 on the tightening head 2321, so that the bolt holes on the top cover are directly below the bolts 400; then, the first driver 24 operates, synchronously driving the first mounting part 211, the tightening structure 23, the second mounting part 212, and the pressure part 22 to descend vertically, so that the pressure part 22 is pressed into the position near the bolt holes; then, the second driver 25 operates, driving the tightening structure 23 to descend vertically, while the tightening gun 232 drives the tightening head 2321 to rotate, so that the bolts 400 are tightened onto the bolt holes by the tightening head 2321. The transfer mechanism 200 operates again to complete the locking of the remaining bolts 400, thus realizing the assembly of the top cover and the box body.

[0119] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A tightening mechanism, characterized in that, include: Connectors; A variable pitch drive module is disposed on the connector; A clamping and tightening integrated mechanism is disposed on the connector, and the clamping and tightening integrated mechanism includes: The mounting component is disposed on the connector, and the variable pitch drive module drives the mounting component to move horizontally relative to the connector; A first actuator is provided on the mounting member, and the first actuator drives the mounting member to move up and down in the vertical direction relative to the connector; A second driver is provided on the mounting component; A clamping element, located at the bottom of the mounting component, is configured to clamp the product; A tightening structure is provided on the mounting member, and a second driver drives the tightening structure to move up and down in the vertical direction relative to the mounting member. The tightening mechanism has a rotatable tightening head configured to tighten bolts onto the product. A positioning structure configured to position the product before the clamping element presses it; the positioning structure includes: A drive structure, wherein the drive structure is disposed on the mounting component; A transmission structure, wherein the transmission structure is driveably connected to the drive structure; A positioning block is connected to the transmission structure. The driving structure drives the positioning block to move toward the side of the upper cover through the transmission structure, so as to push the upper cover to a preset position. The positioning block is located behind the tightening head. The side of the positioning block near the tightening head is provided with a relief groove. The relief groove is used to avoid the tightening head, so that the positioning block forms a U-shaped structure. When the positioning block moves toward the side of the upper cover, the tightening head is located in the relief groove. The two ends of the positioning block located on both sides of the relief groove abut against the side of the upper cover, so as to push the upper cover to the preset position. The transmission structure includes a gear and a rack. The output shaft of the drive structure passes through the clearance groove. The gear is sleeved on the output shaft of the drive structure. The rack meshes with the gear. The positioning block is connected below the rack.

2. The tightening mechanism as described in claim 1, characterized in that, The pressure member has a front side away from the connector, and the front side of the pressure member is provided with an inclined surface, which is configured to avoid the tightening structure.

3. The tightening mechanism as described in claim 2, characterized in that, The pressure member extends in a direction from near the connector to away from the connector.

4. The tightening mechanism as described in any one of claims 1 to 3, characterized in that, The bottom of the pressure component is provided with a pressure boosting section, and the area of ​​the pressure boosting section gradually increases from the top to the bottom.

5. The tightening mechanism as described in claim 4, characterized in that, The booster section is an insulating and pressure-resistant component.

6. The tightening mechanism as described in claim 1, characterized in that, The positioning surface of the positioning block is provided with an insulating and pressure-resistant component.

7. The tightening mechanism as described in any one of claims 1 to 3, characterized in that, The pressure component is provided in at least two parts, and the at least two pressure components are respectively located on opposite sides of the tightening head.

8. The tightening mechanism as described in any one of claims 1 to 3, characterized in that, The mounting component includes: A first mounting component is connected to the connecting component, and the tightening structure is provided on the first mounting component; The second mounting component is connected to the bottom of the first mounting component and is set at an angle to the first mounting component; the pressure component is connected to the second mounting component.

9. The tightening mechanism as described in claim 8, characterized in that, The pressure member is connected to the second mounting member via a connecting guide rod; a buffer member is provided between the connecting guide rod and the second mounting member.

10. The tightening mechanism as described in claim 8, characterized in that, The second mounting component has a through hole, and the tightening head passes through the through hole.

11. The tightening mechanism as described in claim 8, characterized in that, The mounting component further includes a variable pitch connector, which is disposed on the connector and can move horizontally relative to the connector; the first mounting component is disposed on the variable pitch connector and can move vertically relative to the first mounting component.

12. The tightening mechanism as described in claim 11, characterized in that, The first driver is located on the side of the first mounting member close to the pitch connector and is connected to the pitch connector in a driving manner to drive the first mounting member to move up and down in the vertical direction relative to the pitch connector. The second driver is located on the side of the first mounting member away from the variable pitch connector and is connected to the tightening structure in a transmission manner to drive the tightening structure to move up and down in the vertical direction.

13. The tightening mechanism as described in claim 12, characterized in that, The first driver is connected to the variable pitch connector via a first floating joint; And / or, the tightening structure is driven to the second driver via a second floating joint.

14. The tightening mechanism as described in any one of claims 1 to 3, characterized in that, The tightening structure includes: Tighten the connector, which is located on the mounting component; A tightening gun, wherein the tightening gun is disposed on the tightening connector and is provided with the tightening head; A locator, located on the tightening connector, is configured to determine the tightening position of the product; A nail feeder sleeve is fitted onto the tightening head and configured to supply a bolt to the tightening head.

15. The tightening mechanism as described in claim 14, characterized in that, The tightening connector is provided with a clamping member, which is configured to clamp the tightening gun; The clamping member is provided with a locking buckle, which is configured to fasten the tightening gun.

16. A tightening device, characterized in that, include: Transshipment agency; The tightening mechanism as described in any one of claims 1 to 15, wherein the tightening mechanism is throttle-connected to the transfer mechanism, and the transfer mechanism drives the tightening mechanism to move.

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