Core rod winding and tightening device

Abstract

The utility model provides a core rod winding and clamping device which comprises two clamping assemblies which are oppositely arranged, a plurality of cooling through holes are formed in a battery cell and are parallel to each other, and the execution end of each clamping assembly can be inserted into the corresponding cooling through hole. The other end of each clamping assembly is connected to the execution end of the linear driving assembly, the linear driving assembly is installed on an external rotating assembly, the linear driving assembly is used for driving the clamping assemblies to be close to or away from the battery cells, and the rotating assembly is used for driving the linear driving assembly, the clamping assemblies and the battery cells to rotate. According to the core rod winding clamping device disclosed by the utility model, the production of a large-volume battery roll core fixed by a middle supporting structure can be realized, enough supporting force is provided by virtue of the supporting of the inserting column and the clamping force on the two sides, the core rod winding clamping device is suitable for preparing a large-monomer cooling roll core, and the inserting structure is firm and high in reliability.

Description

Technical Field

[0001] The utility model belongs to the field of battery core winding and packaging, in particular to a core rod winding and tightening device. Background Art

[0002] In recent years, the commercial application of lithium batteries has developed rapidly. In order to meet the increasing requirements of terminal application markets such as new energy vehicles for lithium batteries, emerging lithium battery technologies have continued to emerge, presenting a situation where multiple technical routes coexist. At present, the differences in the technical routes of lithium batteries are mainly reflected in the positive electrode material system and packaging form. There are differences in the packaging form of lithium batteries. The packaging form refers to the packaging structure of a single lithium battery. Different packaging forms should have different process processes, and also correspond to different forms of battery precision structural parts. At present, the technical routes of lithium battery packaging mainly include three forms: cylindrical, square, and soft pack. At present, the three types of lithium batteries, cylindrical, square and soft pack, have their own advantages and disadvantages. In the global market, there is a "three-way world" competition pattern, and all have a large market development space. However, square, cylindrical, and soft pack all have the problem that the internal temperature of the battery is higher than the outer surface. The larger the capacity of the battery cell, the greater the temperature difference. The large temperature difference limits the improvement of the battery cell performance and the improvement of the capacity of the single battery.

[0003] The cell structure with a support structure in the middle of the single winding core is common in cylindrical cells, and a plastic circular support structure is used in the middle. The plastic cylindrical support structure is put on the cylindrical winding needle, which is generally between 5-10mm and cylindrical. During the winding process, the plastic cylinder is first put on the winding needle, and the diaphragm is then hot-melted to the plastic cylinder. The equipment is running and the winding action begins. After winding to the predetermined length, the diaphragm and the positive and negative electrodes are cut, and a cylindrical cell is completed.

[0004] The diameter of the cylindrical winding needle is relatively small, and the support strength is relatively small, which is only suitable for the winding production of small batteries. The largest size of the cylindrical battery cell that has been mass-produced in the market is the 4695 model, that is, the maximum diameter of the cylindrical battery cell is 46mm, the maximum height of the cylindrical battery cell is 95mm, and the maximum weight of a single battery cell is only 700g, which can be supported by a single winding needle. However, the winding method of this mechanism is not suitable for the production of large batteries. In order to improve the integration and reduce the cost of integration of current energy storage or power battery products, the single battery cells are getting larger and larger. The current largest winding method can reach 1000AH, and the weight of a single battery cell can reach 20KG. Even with the current conventional 280AH, the weight of a single battery cell reaches 5.3KG, which cannot be supported by a cylindrical winding core with a diameter of a few millimeters.

[0005] The current cylindrical winding needle is a needle-shaped structure, and the size of a single winding needle is fixed, which can only be used for the production of cylindrical batteries of one specification. When the size of the cylindrical battery changes, the winding needle needs to be replaced, and the replacement time is 1-2 hours, which reduces the overall utilization rate of the equipment and is not conducive to improving production efficiency. Therefore, it is necessary to develop a multi-compatible winding and tightening device.

[0006] like Figure 6 As shown, the winding core with a cooling unit in the middle has a flat structure in the middle cooling core rod, which is incompatible with the current winding needle fixing device of the cylindrical winding equipment, and is also incompatible with the current square winding equipment winding needle method. In addition, there is currently no applicable winding clamping device, and it is necessary to develop a special clamping device suitable for the current cooling winding core structure to realize the production of cooling winding cores. Summary of the invention

[0007] In view of this, the utility model aims to propose a core rod winding and tightening device to solve the problems that the cooling cores for batteries in the prior art are mostly wrapped manually, or the cooling core wrapping tooling structure is complex and inconvenient to operate, and the production cost is high.

[0008] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0009] A core rod winding clamping device comprises two clamping assemblies arranged opposite to each other, a battery core is provided with a plurality of cooling through holes, and the plurality of cooling through holes are arranged parallel to each other, an execution end of each clamping assembly can be plugged into the cooling through hole, the other end of each clamping assembly is connected to an execution end of a linear drive assembly, and the linear drive assembly is installed to an external rotating assembly, the linear drive assembly is used to drive the clamping assembly to approach or move away from the battery core, and the rotating assembly is used to drive the linear drive assembly, the clamping assembly and the battery core to rotate.

[0010] Furthermore, the clamping assembly includes a support plate, one end of the support plate is fixedly mounted to the execution end of the linear drive assembly, and the other end of the support plate is rotatably connected to a lead screw, a sliding nut is threadedly connected to the lead screw, and the outer periphery of the sliding nut is slidably connected to the support plate. A drive motor is installed on the support plate, and the drive motor is used to drive the lead screw to rotate. A plug-in column is set on one side of the sliding nut, and the rotating lead screw can drive the sliding nut and the plug-in column to move axially.

[0011] Furthermore, a sliding rod is arranged on the support plate, and the outer contour of the sliding rod is a polygonal structure. The outer periphery of the sliding rod is slidably connected to the slider, the sliding nut can drive the slider to move, and a plug-in column is arranged on one side of the slider.

[0012] Furthermore, the sliding rod is fixedly mounted to one end of the supporting plate through the first support plate, and a sliding block is respectively arranged on both sides of the first support plate, the two sliding blocks are arranged opposite to each other, a return spring is arranged between each sliding block and the first support plate, and the return spring is located on the periphery of the sliding rod, and the return spring is used for the elastic return of the sliding block.

[0013] Furthermore, two threaded units are axially provided on the lead screw, and the thread directions of the two threaded units are opposite. A sliding nut is threadedly connected to each threaded unit. The rotating lead screw can drive the two sliding nuts to slide in opposite directions, and one side of each sliding nut abuts against one side of a slider.

[0014] Furthermore, a positioning switch is provided on the support plate, and the positioning switch includes a second support plate, which is fixedly mounted on the support plate, and a threaded hole is provided on the second support plate, a screw is threadedly connected in the threaded hole, and one end of the screw is rotatably sleeved on one side of the slide seat, and a first sliding hole is provided on the support plate, and the outer periphery of the slide seat is slidably connected to the first sliding hole, and a first touch switch is provided on the slide seat, and the lower end of the slider can contact the execution end of the first touch switch.

[0015] Furthermore, the slide seat is an L-shaped structure, a second sliding hole is provided on the first end of the slide seat, a push rod is slidably installed in the second sliding hole, a first touch switch is provided at the end of the push rod, an adjusting nut is provided on the lower side of the first end of the slide seat, the adjusting nut is threadedly connected to the periphery of the push rod, a third support plate is provided at the second end of the slide seat, a first through hole is provided on the third support plate, the periphery of the push rod is located in the first through hole, a first spring is provided on the periphery of the push rod, one end of the first spring abuts against the lower end of the adjusting nut, and the other end of the first spring is fixedly connected to the periphery of the push rod.

[0016] Furthermore, a first mounting hole is provided on one side of the first support plate, and the first mounting hole is a blind hole. A second touch switch is arranged in the first mounting hole, and one end of the second touch switch is connected to the bottom of the first mounting hole through a second spring, and one side of the sliding nut can abut against the execution end of the second touch switch.

[0017] Furthermore, a second mounting hole is provided on one side of the slider, and the second mounting hole is a blind hole. A third touch switch is arranged in the second mounting hole, one end of the third touch switch is connected to the bottom of the second mounting hole through a third spring, and one side of the sliding nut can abut against the execution end of the third touch switch.

[0018] Compared with the prior art, the core rod winding clamping device described in the utility model has the following beneficial effects: the clamping device can realize the production of battery cores with large-volume fixed intermediate support structures, relying on the support of plug-in columns and the clamping force on both sides to provide sufficient support strength, which is suitable for the preparation of large-cell cooling cores, and the plug-in structure is firm and highly reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0020] Figure 1 It is a structural schematic diagram of a mandrel winding and tightening device plugged into a battery core according to an embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of a mandrel winding and tightening device according to an embodiment of the utility model;

[0022] Figure 3 It is a front view schematic diagram of a mandrel winding and tightening device according to an embodiment of the utility model;

[0023] Figure 4 It is a side view schematic diagram of a mandrel winding and tightening device according to an embodiment of the utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the positioning switch according to an embodiment of the utility model;

[0025] Figure 6 It is a schematic structural diagram of a battery core according to an embodiment of the utility model.

[0026] Description of reference numerals:

[0027] 1-clamping assembly; 11-support plate; 12-lead screw; 13-sliding nut; 14-driving motor; 15-plug-in column; 16-first support plate; 17-slide rod; 18-reset spring; 19-slider; 2-battery core; 21-cooling through hole; 3-positioning switch; 31-second support plate; 32-screw; 33-slide seat; 34-top rod; 35-third support plate; 36-first spring. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0029] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0032] like Figure 1-Figure 6As shown, a core rod winding clamping device includes two clamping assemblies 1 arranged opposite to each other, a plurality of cooling through holes 21 are provided on the battery core 2, and the plurality of cooling through holes 21 are arranged parallel to each other, the execution end of each clamping assembly 1 can be inserted into the cooling through hole 21, the other end of each clamping assembly 1 is connected to the execution end of the linear drive assembly, and the linear drive assembly is installed to an external rotating assembly, the linear drive assembly is used to drive the clamping assembly 1 to approach or move away from the battery core 2, the rotating assembly is used to drive the linear drive assembly, the clamping assembly 1 and the battery core 2 to rotate, and the linear drive assembly is a linear drive motor 14 of the prior art, and the rotating assembly is a servo motor. During implementation, the two clamping assemblies 1, one of which is connected to the output shaft of the servo motor, and the other is rotatably sleeved to a fixed position through a bearing, and the two clamping assemblies 1 are coaxially arranged. The clamping device can realize the production of battery roll cores with large-volume intermediate support structures fixed thereto, relying on the support of the plug-in column 15 and the clamping force on both sides to provide sufficient support strength, which is suitable for the preparation of large-unit cooling roll cores, and the plug-in structure is firm and has high reliability. The control method of this embodiment is controlled by a controller, and the control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field, and this article is mainly used to protect mechanical devices. The control method and circuit connection are not explained in detail in this article.

[0033] The clamping assembly 1 includes a support plate 11, one end of the support plate 11 is fixedly mounted to the execution end of the linear drive assembly, and the other end of the support plate 11 is rotatably sleeved with a lead screw 12, and a sliding nut 13 is threadedly connected to the lead screw 12, and the periphery of the sliding nut 13 is slidably connected to the support plate 11, and a driving motor 14 is installed on the support plate 11, and the driving motor 14 is used to drive the lead screw 12 to rotate. A plug-in column 15 is arranged on one side of the sliding nut 13, and the rotating lead screw 12 can drive the sliding nut 13 and the plug-in column 15 to move axially, and a first gear is arranged on the lead screw 12, and the transmission gear of the driving motor 14 is meshed with the periphery of the first gear, and the transmission gear of the driving motor 14 drives the lead screw 12 to rotate through the first gear, and the sliding nut 13 slides linearly on the support plate 11, and the rotating lead screw 12 provides power for the sliding nut 13 to slide linearly on the support plate 11, and the linearly sliding sliding nut 13 drives the plug-in column 15 to adjust the relative position so as to be plugged into the corresponding cooling through hole 21.

[0034] A slide bar 17 is provided on the support plate 11, and the outer contour of the slide bar 17 is a polygonal structure. The outer periphery of the slide bar 17 is slidably connected to the slider 19, and the slide nut 13 can drive the slider 19 to move, and a plug-in column 15 is provided on one side of the slider 19. During implementation, the slide nut 13 abuts against one side of the slider 19, and the inner ring of the slider 19 is slidably connected to the slide bar 17 with a polygonal contour. The slide bar 17 can prevent the slider 19 from rotating relative to each other, and the slide nut 13 slides linearly on the support plate 11, so the slide nut 13 abuts against one side of the slider 19 to drive the slider 19 to move linearly, as shown in FIG. Figure 2 As shown, the slide rod 17 is fixedly installed to one end of the support plate 11 through the first support plate 16, and a slide block 19 is respectively arranged on both sides of the first support plate 16, and the two slide blocks 19 are arranged opposite to each other. A reset spring 18 is arranged between each slide block 19 and the first support plate 16, and the reset spring 18 is located on the periphery of the slide rod 17. The reset spring 18 is used for elastic reset of the slide block 19; two threaded units are axially arranged on the lead screw 12, and the thread directions of the two threaded units are opposite, and each threaded unit is threadedly connected to a sliding nut 13, and the rotating lead screw 1 2 can drive the two sliding nuts 13 to slide in opposite directions, one side of each sliding nut 13 abuts against one side of a slider 19, and the driving motor 14 can drive the two sliding nuts 13 to move toward each other or relative to each other when driving the lead screw 12 to rotate. When moving toward each other, each sliding nut 13 drives a slider 19 away from the first support plate 16, and when moving relative to each other, each slider 19 is moved toward the first support plate 16 by the action of the reset spring 18, so as to adjust the relative positions of the two plug-in posts 15 and realize the reset when plugging or unloading the battery core 2.

[0035] A positioning switch 3 is arranged on the support plate 11, and the positioning switch 3 includes a second support plate 31, and the second support plate 31 is fixedly installed on the support plate 11. A threaded hole is arranged on the second support plate 31, and a screw rod 32 is threadedly connected in the threaded hole, and one end of the screw rod 32 is rotatably sleeved on one side of a slide seat 33. A first sliding hole is arranged on the support plate 11, and the outer periphery of the slide seat 33 is slidably connected to the first sliding hole. A first touch switch is arranged on the slide seat 33, and the lower end of the slider 19 can contact the execution end of the first touch switch, and the first touch switch is a D2F-L small micro tripod limit switch. When the staff rotates the screw rod 32, since the screw rod 32 is threadedly connected to the second support plate 31, the end of the screw rod 32 can be relatively displaced along the axial direction, and the slide seat 33 is limited by the first sliding hole and slides in the first sliding hole without rotating. Therefore, rotating the screw rod 32 can adjust the relative position of the first touch switch, and the lower end of the slider 19 contacts the execution end of the first touch switch, which is a detection structure that the slider 19 reaches the set position.

[0036] The slide seat 33 is an L-shaped structure, and a second sliding hole is provided on the first end of the slide seat 33, and a push rod 34 is slidably installed in the second sliding hole, and a first touch switch is provided at the end of the push rod 34, and an adjusting nut is provided on the lower side of the first end of the slide seat 33, and the adjusting nut is threadedly connected to the outer periphery of the push rod 34, and a third support plate 35 is provided at the second end of the slide seat 33, and a first through hole is provided on the third support plate 35, and the outer periphery of the push rod 34 is located in the first through hole, and a first spring 36 is provided on the outer periphery of the push rod 34, one end of the first spring 36 abuts against the lower end of the adjusting nut, and the other end of the first spring 36 is fixedly connected to the outer periphery of the push rod 34, and the push rod 34 slides in the first through hole to prevent the first touch switch from rigidly contacting the bottom of the slider 19 to cause damage to parts, thereby improving the service life of parts, and the first spring 36 is used for elastic reset of the first touch switch.

[0037] A first mounting hole is provided on one side of the first support plate 16, and the first mounting hole is a blind hole. A second touch switch is arranged in the first mounting hole, and one end of the second touch switch is connected to the bottom of the first mounting hole through a second spring. One side of the sliding nut 13 can abut against the execution end of the second touch switch. The second touch switch is a D2F-L small micro tripod limit switch. One side of the sliding nut 13 abuts against the execution end of the second touch switch to form a stop structure for the movable nut to move to the origin.

[0038] A second mounting hole is provided on one side of the slider 19, and the second mounting hole is a blind hole. A third touch switch is arranged in the second mounting hole. One end of the third touch switch is connected to the bottom of the second mounting hole through a third spring. One side of the sliding nut 13 can abut against the execution end of the third touch switch. The third touch switch is a D2F-L small micro tripod limit switch. One side of the sliding nut 13 abuts against the execution end of the third touch switch, which is a detection structure of the sliding nut 13 abutting against the slider 19.

[0039] Working process of a mandrel winding and tightening device:

[0040] The staff places the battery cell 2 at the designated position, and the two oppositely arranged linear drive assemblies drive a clamping assembly 1 to move toward the battery cell 2. During the movement, the servo motor drives the lead screw 12 to rotate in the positive direction through the first gear, and the rotating lead screw 12 drives the slider 19 to move in the opposite direction. The sliding nut 13 contacts the third touch switch, and the signal is transmitted to the controller, which means that the sliding nut 13 drives the slider 19 to slide. During the movement of the slider 19, it can contact the execution end of the first touch switch, such as Figure 3As shown, two groups of first touch switches can be set to detect the position of different sliders 19. When the slider 19 reaches the predetermined displacement position, the servo motor stops rotating forward, and the linear drive assembly drives the clamping assembly 1 to move into position. At this time, the plug-in column 15 is plugged into the cooling through hole 21, and the servo motor rotates in the opposite direction. The slider 19 is out of contact with the sliding nut 13. At this time, the slider 19 is always reset elastic under the influence of the reset spring 18. The plug-in column 15 is clamped into the cooling through hole 21, and the rotating assembly drives the battery core 2 to rotate for wrapping. After rotating the rated number of times, the servo motor rotates forward to contact the third touch switch. After the servo motor rotates the rated number of times, the plug-in column 15 no longer clamps the cooling through hole 21, and the linear drive assembly is reset. The wrapped battery core 2 is out of contact with the clamping assembly 1, and the servo motor rotates in the opposite direction until the sliding nut 13 contacts the second touch switch, indicating that the sliding nut 13 is reset, and the slider 19 is reset under the influence of the reset spring 18.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mandrel winding and tightening device, characterized in that: The invention comprises two clamping assemblies (1) arranged opposite to each other, a plurality of cooling through holes (21) are arranged on the battery core (2), and the plurality of cooling through holes (21) are arranged parallel to each other, the execution end of each clamping assembly (1) can be inserted into the cooling through hole (21), the other end of each clamping assembly (1) is connected to the execution end of a linear drive assembly, and the linear drive assembly is installed on an external rotating assembly, the linear drive assembly is used to drive the clamping assembly (1) to approach or move away from the battery core (2), and the rotating assembly is used to drive the linear drive assembly, the clamping assembly (1) and the battery core (2) to rotate.

2. A mandrel winding and tightening device according to claim 1, characterized in that: The clamping assembly (1) comprises a support plate (11), one end of the support plate (11) is fixedly mounted on the execution end of the linear drive assembly, the other end of the support plate (11) is rotatably sleeved on a lead screw (12), a sliding nut (13) is threadedly connected to the lead screw (12), the outer periphery of the sliding nut (13) is slidably connected to the support plate (11), a driving motor (14) is mounted on the support plate (11), the driving motor (14) is used to drive the lead screw (12) to rotate, a plug-in column (15) is arranged on one side of the sliding nut (13), and the rotating lead screw (12) can drive the sliding nut (13) and the plug-in column (15) to move axially.

3. A mandrel winding and tightening device according to claim 2, characterized in that: A slide bar (17) is arranged on the support plate (11), and the outer contour of the slide bar (17) is a polygonal structure. The outer periphery of the slide bar (17) is slidably connected to the slider (19), the slide nut (13) can drive the slider (19) to move, and a plug-in column (15) is arranged on one side of the slider (19).

4. A mandrel winding and tightening device according to claim 3, characterized in that: The slide bar (17) is fixedly mounted to one end of the support plate (11) through the first support plate (16), and a slide block (19) is respectively arranged on both sides of the first support plate (16), and the two slide blocks (19) are arranged opposite to each other. A return spring (18) is arranged between each slide block (19) and the first support plate (16), and the return spring (18) is located on the periphery of the slide bar (17), and the return spring (18) is used for elastic return of the slide block (19).

5. The mandrel winding and tightening device according to claim 3, characterized in that: Two threaded units are axially arranged on the lead screw (12), and the thread directions of the two threaded units are opposite. A sliding nut (13) is threadedly connected to each threaded unit. The rotating lead screw (12) can drive the two sliding nuts (13) to slide in opposite directions, and one side of each sliding nut (13) abuts against one side of a slider (19).

6. The mandrel winding and tightening device according to claim 3, characterized in that: A positioning switch (3) is arranged on the support plate (11), and the positioning switch (3) comprises a second support plate (31), and the second support plate (31) is fixedly mounted on the support plate (11), and a threaded hole is arranged on the second support plate (31), and a screw rod (32) is threadedly connected in the threaded hole, and one end of the screw rod (32) is rotatably sleeved on one side of a slide seat (33), and a first sliding hole is arranged on the support plate (11), and the outer periphery of the slide seat (33) is slidably connected to the first sliding hole, and a first touch switch is arranged on the slide seat (33), and the lower end of the slider (19) can contact the execution end of the first touch switch.

7. A mandrel winding and tightening device according to claim 6, characterized in that: The slide seat (33) is an L-shaped structure. A second slide hole is provided on the first end of the slide seat (33). A push rod (34) is slidably installed in the second slide hole. A first touch switch is provided at the end of the push rod (34). An adjusting nut is provided on the lower side of the first end of the slide seat (33). The adjusting nut is threadedly connected to the outer periphery of the push rod (34). A third support plate (35) is provided at the second end of the slide seat (33). A first through hole is provided on the third support plate (35). The outer periphery of the push rod (34) is located in the first through hole. A first spring (36) is provided on the outer periphery of the push rod (34). One end of the first spring (36) abuts against the lower end of the adjusting nut. The other end of the first spring (36) is fixedly connected to the outer periphery of the push rod (34).

8. The mandrel winding and tightening device according to claim 2, characterized in that: A first mounting hole is provided on one side of the first support plate (16), and the first mounting hole is a blind hole. A second touch switch is provided in the first mounting hole, and one end of the second touch switch is connected to the bottom of the first mounting hole via a second spring. One side of the sliding nut (13) can abut against the execution end of the second touch switch.

9. The mandrel winding and tightening device according to claim 2, characterized in that: A second mounting hole is provided on one side of the slider (19), and the second mounting hole is a blind hole. A third touch switch is provided in the second mounting hole, and one end of the third touch switch is connected to the bottom of the second mounting hole via a third spring. One side of the sliding nut (13) can abut against the execution end of the third touch switch.

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