Bottom cover screwing machine for assembling threaded bottom cover of watch

Abstract

The utility model relates to the technical field of watch processing, and discloses a bottom cover screwing machine for assembling a watch threaded bottom cover, which can accurately control the screwing force and improve the screwing effect, and comprises a rack, a screwing assembly, a torsion sensor and a display device, the rack is movably placed on a workbench, the bottom surface of the rack is provided with a non-circular groove / hole, and the display device is arranged in the non-circular groove / hole. The rack comprises a mounting table, a vertical frame fixedly connected with the mounting table, and a cantilever fixed to the top end of the vertical frame and provided with a through hole. The screwing assembly comprises a connecting rod penetrating through the through hole, a handle fixed to the top of the connecting rod, a clamping head fixed to the bottom of the connecting rod, and two clamping jaws installed at the bottom of the clamping head and adjustable in position on the clamping head. The torsion sensor penetrates through the upper surface and the lower surface of the workbench and is fixedly connected with the workbench, the detection end of the torsion sensor extends out of the upper surface of the workbench and is inserted into the non-circular groove / hole, and the outer contour shape of the detection end of the torsion sensor is matched with the inner contour shape of the non-circular groove / hole; the display device is electrically connected with the torsion sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of watch processing, in particular to a bottom cover screwing machine used for assembling a threaded bottom cover of a watch. Background Art

[0002] The watch bottom cover screwing machine is a device used to tighten the threaded case and bottom cover to assemble the case and bottom cover. It replaces the method of grabbing the bottom cover with a clip and tightening the bottom cover, which improves the assembly efficiency of the case and bottom cover. However, the watch bottom cover screwing machines currently on the market only provide the case positioning and bottom cover grabbing and rotating functions. When assembling the bottom cover and the watch case, the operator mainly relies on experience to control the rotation force to tighten the bottom cover. Due to the limitations of the operator's operating level, it is easy to cause thread damage due to excessive tightening force, and it is also easy to cause the bottom cover to loosen due to insufficient tightening force. The tightening effect of the bottom cover is insufficient, and there is a major hidden danger in the product assembly quality. Utility Model Content

[0003] Based on this, it is necessary to provide a bottom cover screwing machine for assembling watch threaded bottom covers, which can accurately control the tightening force and improve the tightening effect, in order to address the above-mentioned shortcomings.

[0004] A bottom cover screwing machine for assembling a threaded bottom cover of a watch, comprising:

[0005] A frame, the frame is movably placed on the upper surface of the workbench, a non-circular groove / hole is opened on the bottom surface of the frame, the frame comprises a mounting platform for clamping the watch case, a stand located beside the mounting platform and fixedly connected to the mounting platform, a cantilever fixed to the top of the stand and located above the mounting platform, and a through hole extending in the vertical direction is opened on the cantilever;

[0006] A tightening assembly, the tightening assembly comprising a connecting rod passing through the through hole, a handle located above the cantilever and fixedly connected to the top of the connecting rod, a clamping head located below the cantilever and fixedly connected to the bottom of the connecting rod, and two clamping jaws arranged opposite to each other and installed at the bottom of the clamping head, wherein the position of the clamping jaws on the clamping head is adjustable, and a clamping area for clamping the bottom cover is formed between the two clamping jaws;

[0007] A torque sensor, wherein the torque sensor penetrates the upper surface and the lower surface of the workbench and is fixedly connected to the workbench, a detection end of the torque sensor extends out of the upper surface of the workbench and is inserted into the non-circular groove / hole, and an outer contour shape of the detection end of the torque sensor is adapted to an inner contour shape of the non-circular groove / hole; and

[0008] A display device is electrically connected to the torque sensor.

[0009] In one embodiment, the bottom capping machine further includes a sound alarm electrically connected to the torque sensor.

[0010] In one embodiment, the sound alarm is a buzzer.

[0011] In one of the embodiments, the cross-section of the detection end of the torque sensor is rectangular, and the cross-section of the non-circular groove / hole is rectangular.

[0012] In one of the embodiments, the frame further includes a bottom plate, which is located below the mounting platform and the stand and is fixedly connected to the mounting platform and the stand respectively, and the non-circular groove / hole is opened on the bottom surface of the bottom plate.

[0013] In one embodiment, the base plate is connected to the mounting platform and the stand by screws, or the base plate is fixed to the mounting platform and the stand by welding, or the base plate, the mounting platform, the stand and the cantilever are integrally formed.

[0014] In one embodiment, a shock absorbing spring is sleeved on the connecting rod between the handle and the cantilever.

[0015] In one of the embodiments, a guide groove is provided on the bottom surface of the chuck, and a limit hole connected to the guide groove is provided on the front side surface of the chuck. The tightening assembly also includes a first knob located on the left side of the chuck, a second knob located on the right side of the chuck, a first screw rod that passes through the left side wall of the chuck and is inserted into the guide groove and is fixedly connected to the first knob, a second screw rod that passes through the right side wall of the chuck and is inserted into the guide groove and is fixedly connected to the second knob, a first limit pin and a second limit pin that pass through the limit hole and are inserted into the guide groove, a first nut that is sleeved on the first screw rod and is respectively fixedly connected to the top of one jaw and the first limit pin, a second nut that is sleeved on the second screw rod and is respectively fixedly connected to the top of the other jaw and the second limit pin, and threaded holes corresponding to the threads of the first screw rod and the second screw rod are respectively provided on the left side wall and the right side wall of the chuck.

[0016] In one embodiment, a limiting groove is provided on the upper surface of the mounting platform, and the bottom cover screwing machine also includes a locking assembly, wherein the locking assembly includes a third knob and a fourth knob located on two opposite sides of the mounting platform, a third screw rod penetrating the side wall of the mounting platform and inserted into the limiting groove and fixedly connected to the third knob, a fourth screw rod penetrating the side wall of the mounting platform and inserted into the limiting groove and fixedly connected to the fourth knob, a third nut rotatably sleeved on the third screw rod, a first limiting block located above the mounting platform and fixedly connected to the third nut, a fourth nut rotatably sleeved on the fourth screw rod, a second limiting block located above the mounting platform and fixedly connected to the fourth nut, the lower surface of the first limiting block and the lower surface of the second limiting block respectively abut against the upper surface of the mounting platform, and a watch case clamping area is formed between the first limiting block and the second limiting block.

[0017] In one embodiment, two opposite sides of the upper surface of the first limit block each have a first installation notch for embedding the lug on one side of the watch case, and two opposite sides of the upper surface of the second limit block each have a second installation notch for embedding the lug on the other side of the watch case.

[0018] The present invention is used to implement a bottom cover screwing machine for assembling a threaded bottom cover of a watch. A torque sensor is arranged at the bottom of a frame, and a display device electrically connected to the torque sensor is installed. Since the frame is movably placed on a workbench, when the handle is rotated to drive the bottom cover to rotate on the watch case via a connecting rod, a chuck and a clamping claw, the watch case rotates synchronously driven by the bottom cover, thereby further driving the frame to rotate. When the frame rotates, the detection end of the torque sensor rotates through the cooperation between the non-circular groove / hole and the detection end of the torque sensor. The torque sensor further transmits the torque detected by its detection end to the display device and displays it. The operator can control the tightening geography of the bottom cover through the torque value displayed on the display device, realize accurate control of the torque between the bottom cover and the watch case, thereby improving the tightening effect of the bottom cover, and solving the quality hidden danger problem caused by the non-quantifiable torque size during product assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a bottom capping machine in one embodiment of the utility model;

[0020] Figure 2 It is a cross-sectional structural diagram of a bottom capping machine from one perspective in one embodiment of the utility model;

[0021] Figure 3 It is a cross-sectional structural diagram of another perspective of the bottom capping machine in one embodiment of the utility model;

[0022] Figure 4 for Figure 2 A schematic diagram of a partially enlarged structure of part A in the illustrated embodiment;

[0023] Figure 5 for Figure 3 A schematic diagram of the partial enlarged structure of part B in the illustrated embodiment. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0025] Please combine Figure 1-5 The utility model discloses a bottom cover screwing machine 10 for assembling a threaded bottom cover of a watch, which can accurately control the tightening force and improve the tightening effect. The bottom cover screwing machine includes a frame 100, a tightening assembly 200, a torque sensor 300 and a display device 400, wherein the frame 100 is movably placed on the upper surface of a workbench 20, that is, when the frame 100 is subjected to a horizontal force, it will move or rotate on the upper surface of the workbench 20. A non-circular groove / hole 110 is provided on the bottom surface of the frame 100, and the non-circular groove / hole 110 is used to provide a connection portion between the frame 100 and the torque sensor 300, so that when the frame 100 is rotated by an external torque, it can drive the detection end of the torque sensor 300 to move, so that the torque sensor 300 can detect the rotation of the frame 100. The frame 100 includes a mounting platform 120 for clamping the watch case, a stand 130 located beside the mounting platform 120 and fixedly connected to the mounting platform 120, and a cantilever 140 fixed to the top of the stand 130 and located above the mounting platform 120, and a through hole 141 extending in the vertical direction is opened on the cantilever 140. The tightening assembly 200 includes a connecting rod 210 penetrating the through hole 141, a handle 220 located above the cantilever 140 and fixedly connected to the top of the connecting rod 210, a clamping head 230 located below the cantilever 140 and fixedly connected to the bottom of the connecting rod 210, and two clamping jaws 240 arranged opposite to each other and mounted at the bottom of the clamping head 230, the position of the clamping jaws 240 on the clamping head 230 is adjustable, and a clamping area for clamping the bottom cover is formed between the two clamping jaws 240. The handle 220 is used to provide a gripping portion during operation, so that the operator can grip the handle 220 and drive the handle 220 and the connecting rod 210 to rotate, thereby realizing the rotation of the bottom cover; the clamping claw 240 is used to grip the bottom cover to be tightened, and by driving the bottom cover to rotate, the bottom cover is gradually tightened on the watch case.

[0026] The torque sensor 300 penetrates the upper surface and the lower surface of the workbench 20 and is fixedly connected to the workbench 20. Preferably, the torque sensor 300 is fixed to the workbench 20 by M4 screws. The detection end 310 of the torque sensor 300 extends out of the upper surface of the workbench 20 and is inserted into the non-circular groove / hole 110, and the outer contour shape of the detection end 310 of the torque sensor 300 is adapted to the inner contour shape of the non-circular groove / hole 110. In this way, through the mutual constraint of the ring side surface of the detection end 310 of the torque sensor 300 and the inner surface of the non-circular groove / hole 110, the horizontal direction of the two can be limited. When the rack 100 is subjected to horizontal torque and rotates, the rack 100 will further drive the detection end 310 of the torque sensor 300 to rotate, so that the torque sensor 300 detects the corresponding torque signal. Further, the cross section of the detection end 310 of the torque sensor 300 is rectangular, and the cross section of the non-circular groove / hole 110 is rectangular. Preferably, the cross-section of the detection end 310 of the torque sensor 300 is a square of 12.5 mm x 12.5 mm, and the cross-sectional shape and size of the non-circular groove / hole 110 match the cross-sectional shape and size of the detection end 310 of the torque sensor 300. In other embodiments, when the cross-sectional shape of the detection end 310 of the torque sensor 300 is a triangle, the cross-sectional shape of the non-circular groove / hole 110 is a triangle; when the cross-sectional shape of the detection end 310 of the torque sensor 300 is a pentagon, the cross-sectional shape of the non-circular groove / hole 110 is a pentagon. According to the different shapes of the detection end 310 of the torque sensor 300, the cross-sectional shape of the non-circular groove / hole 110 can be further adjusted, which will not be described in detail here. The display device 400 is electrically connected to the torque sensor 300, and is used to display the corresponding torque value when receiving the torque signal sent by the torque sensor 300, so as to provide a reference for the operator in the process of tightening the bottom cover.

[0027] It should be noted that, in this embodiment, the non-circular groove / hole 110 can be provided on the bottom surface of the mounting platform 120 or the bottom surface of the stand 130. Further, the rack 100 further includes a bottom plate 150, which is located below the mounting platform 120 and the stand 130 and is fixedly connected to the mounting platform 120 and the stand 130 respectively. The non-circular groove / hole 110 is provided on the bottom surface of the bottom plate 150. Of course, the bottom surface of the mounting platform 120 or the bottom surface of the stand 130 can also be provided with an extended hole corresponding to the non-circular groove / hole 110, so that when the detection end 310 of the torque sensor 300 is long, the top end of the detection end 310 of the torque sensor 300 can be inserted into the extended hole to increase the matching area between the torque sensor 300 and the rack 100. In this embodiment, the bottom plate 150 is made of aluminum alloy material, which ensures the mechanical strength of the bottom of the frame 100 and prevents the bottom plate 150 from causing damage to the detection end 310 of the torque sensor 300 when the bottom plate 150 drives the rotation, while reducing the weight of the entire frame 100. Further preferably, the projection area of ​​the bottom plate 150 on the upper surface of the workbench 20 is greater than the sum of the projection areas of the mounting platform 120 and the stand 130 on the upper surface of the workbench 20, thereby increasing the contact area between the frame 100 and the workbench 20, improving the stability of the frame 100 placed on the workbench 20, and preventing the frame 100 from tipping over. The bottom plate 150 can be connected to the mounting platform 120 and the stand 130 in a variety of replaceable ways. In one embodiment, the bottom plate 150 is connected to the mounting platform 120 and the stand 130 by screws. In another embodiment, the bottom plate 150 is fixed to the mounting platform 120 and the stand 130 by welding. In another embodiment, the bottom plate 150, the mounting platform 120, the stand 130 and the cantilever 140 are integrally formed. In this embodiment, the mounting platform 120, the stand 130 and the cantilever 140 are integrally formed, and the bottom plate 150 is screwed to the mounting platform 120 and the stand 130 respectively.

[0028] In one embodiment, a damping spring 250 is sleeved on the connecting rod 210 between the handle 220 and the cantilever 140. By providing the damping spring 250, the distance between the handle 220 and the cantilever 140 is limited. When the connecting rod 210 droops naturally, the bottom of the damping spring 250 abuts against the upper surface of the cantilever 140, which can avoid the problem of component damage caused by the handle 220 hitting the cantilever 140, thereby extending the service life of the bottom capping machine. The handle 220 of this embodiment can be at least one operating rod extending from the top of the connecting rod 210 to the direction away from the axis of the connecting rod 210, or it can be an operating ring located above the connecting rod 210 and fixedly connected to the connecting rod 210 through a connecting arm.

[0029] In one embodiment, a guide groove 231 is provided on the bottom surface of the chuck 230, and a limit through hole 232 connected to the guide groove 231 is provided on the front side of the chuck 230. The tightening assembly 200 also includes a first knob 233 located on the left side of the chuck 230, a second knob 234 located on the right side of the chuck 230, a first screw rod 235 that passes through the left side wall of the chuck 230 and is inserted into the guide groove 231 and is fixedly connected to the first knob 233, and a second screw rod 235 that passes through the right side wall of the chuck 230 and is inserted into the guide groove 231 and is fixedly connected to the second knob 234. The screw rod 236, the first limit pin 237 and the second limit pin 238 passing through the limit through hole 232 and inserted into the guide groove 231, the first nut 2351 sleeved on the first screw rod 235 and fixedly connected to the top of one clamping jaw 240 and the first limit pin 237 respectively, the second nut 2361 sleeved on the second screw rod 236 and fixedly connected to the top of the other clamping jaw 240 and the second limit pin 238 respectively, the left side wall and the right side wall of the chuck 230 are respectively provided with threaded holes corresponding to the first screw rod 235 and the second screw rod 236. When the first knob 233 is rotated, since the first limit pin 237 is fixedly connected to the first nut 2351, and the first nut 2351 is sleeved on the first screw rod 235, during the process of the first knob 233 driving the first screw rod 235 to rotate, the first nut 2351 is constrained by the first limit pin 237 to drive the clamping jaw 240 connected thereto to move along the length direction of the clamping head 230; similarly, when the second knob 234 is rotated, since the second limit pin 238 is fixedly connected to the second nut 2361, and the second nut 2361 is sleeved on the second screw rod 236, during the process of the second knob 234 driving the second screw rod 236 to rotate, the second nut 2361 is constrained by the second limit pin 238 to drive the clamping jaw 240 connected thereto to move along the length direction of the clamping head 230, thereby achieving the adjustment of the distance between the two clamping jaws 240, thereby adjusting the width of the clamping area to clamp the bottom cover. In this embodiment, it is agreed that the side of the chuck head 230 that is located in the vertical plane and faces the user is the front side of the chuck head 230, the two sides of the front side are the left side and the right side of the chuck head 230, and the side of the chuck head 230 that corresponds to the mounting platform 120 is the bottom surface of the chuck head 230. Further, the first screw rod 235 and the second screw rod 236 are integrally formed, and the screw thread on the first screw rod 235 is opposite to the screw thread on the second screw rod 236. In this way, only one of the first knob 233 and the second knob 234 needs to be turned to adjust the positions of the two clamping jaws 240 at the same time, so as to achieve the purpose of adjusting the width of the clamping area and clamping the bottom cover.

[0030] In order to achieve the clamping of the watch case, in one embodiment, a groove for embedding the watch case is provided on the upper surface of the mounting platform 120, and an elastic protective layer is provided on the inner surface of the groove to avoid scratching the watch case. In another embodiment, a limiting groove 121 is provided on the upper surface of the mounting platform 120, and the bottom cover screwing machine further includes a locking assembly 500, which includes a third knob 510 and a fourth knob 520 located on two opposite sides of the mounting platform 120, a third screw rod 530 that passes through the side wall of the mounting platform 120 and is inserted into the limiting groove 121 and is fixedly connected to the third knob 510, a fourth screw rod 540 that passes through the side wall of the mounting platform 120 and is inserted into the limiting groove 121 and is fixedly connected to the fourth knob 520, and a third screw rod 530 that is rotatably sleeved on the third knob 510. The third nut 550 on the screw rod 530, the first stopper 560 located above the mounting platform 120 and fixedly connected to the third nut 550, the fourth nut 570 rotatably sleeved on the fourth screw rod 540, the second stopper 580 located above the mounting platform 120 and fixedly connected to the fourth nut 570, the lower surface of the first stopper 560 and the lower surface of the second stopper 580 are respectively in contact with the upper surface of the mounting platform 120, and the case clamping area is formed between the first stopper 560 and the second stopper 580. Preferably, the first stopper 560 and the second stopper 580 are made of rubber, PVC or other plastic materials. Since the third screw rod 530 is threadedly matched with the third nut 550, the fourth screw rod 540 is threadedly matched with the fourth nut 570, and the bottom surface of the first limit block 560 and the bottom surface of the second limit block 580 are both in contact with the upper surface of the mounting platform 120, the upper surface of the mounting platform 120 will limit the rotation of the first limit block 560 and the second limit block 580. In this way, when the third knob 510 and the fourth knob 520 are rotated, the third nut 550 will drive the first limit block 560 to move along the length direction of the third screw rod 530, and the fourth nut 570 will drive the second limit block 580 to move along the length direction of the fourth screw rod 540, thereby achieving the purpose of adjusting the width of the watch case clamping area to clamp the watch case.

[0031] Furthermore, the third screw rod 530 and the fourth screw rod 540 are integrally formed, and the screw thread on the third screw rod 530 is opposite to the screw thread on the fourth screw rod 540. Thus, only one of the third knob 510 and the fourth knob 520 needs to be rotated to adjust the positions of the first limit block 560 and the second limit block 580 at the same time, so as to adjust the width of the clamping area of ​​the watch case and clamp the watch case. In addition, in this embodiment, two opposite sides of the upper surface of the first limit block 560 are respectively provided with a first installation notch 561 for embedding the lug on one side of the watch case, and two opposite sides of the upper surface of the second limit block 580 are respectively provided with a second installation notch 581 for embedding the lug on the other side of the watch case. By opening two first installation notches 561 on the first limit block 560 and two second installation notches 581 on the second limit block 580, the four lugs on the watch case can be supported, thereby clamping the watch case to prevent the watch case from leaving the watch case clamping area when squeezed by the first limit block 560 and the second limit block 580, thereby improving the stability and reliability of the watch case clamping.

[0032] In one embodiment, the bottom cover screwing machine also includes a sound alarm electrically connected to the torque sensor 300. Preferably, the sound alarm is a buzzer. Of course, in other embodiments, the sound alarm may also include an audio circuit and a speaker connected to the audio circuit. After the bottom cover screwing machine is assembled, the standard torque value is first set for the torque sensor 300 (for example, the standard torque value is set to 3.0NM), the watch case is fixed on the mounting table 120, and the bottom cover is placed on the watch case, the handle 220 is operated so that the clamping claw 240 is aligned with the clamping position on the bottom cover, and then the handle 220 is turned clockwise to rotate the bottom cover. During this process, the display device 400 will display the torque value in real time until the torque reaches the preset 3.0NM. At this time, the sound alarm emits an alarm sound to feedback that the bottom cover and the watch case are assembled in place, and the operator can stop the operation to avoid the bottom cover from loosening due to insufficient torque on the bottom cover, and the bottom cover thread damage caused by excessive torque.

[0033] The bottom cover screwing machine 10 for assembling the threaded bottom cover of a watch is provided with a torque sensor 300 at the bottom of the frame 100, and a display device 400 electrically connected to the torque sensor 300 is installed. Since the frame 100 is movably placed on the workbench 20, when the handle 220 is rotated to drive the bottom cover to rotate on the watch case via the connecting rod 210, the chuck 230 and the clamping claw 240, the watch case rotates synchronously driven by the bottom cover, thereby further driving the frame 100 to rotate. When the frame 100 rotates, the display device 400 electrically connected to the torque sensor 300 is installed. The cooperation between the non-circular groove / hole 110 and the detection end 310 of the torque sensor 300 causes the detection end 310 of the torque sensor 300 to rotate. The torque sensor 300 further transmits the torque detected by its detection end 310 to the display device 400 and displays it. The operator can control the tightening of the bottom cover through the torque value displayed on the display device 400, and realize precise control of the torque between the bottom cover and the watch case, thereby improving the tightening effect of the bottom cover and solving the quality risk problem caused by the non-quantifiable torque size during product assembly.

[0034] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A bottom cover screwing machine for assembling a threaded bottom cover of a watch, characterized in that: include: A frame, the frame is movably placed on the upper surface of the workbench, a non-circular groove / hole is opened on the bottom surface of the frame, the frame comprises a mounting platform for clamping the watch case, a stand located beside the mounting platform and fixedly connected to the mounting platform, a cantilever fixed to the top of the stand and located above the mounting platform, and a through hole extending in the vertical direction is opened on the cantilever; A tightening assembly, the tightening assembly comprising a connecting rod passing through the through hole, a handle located above the cantilever and fixedly connected to the top of the connecting rod, a clamping head located below the cantilever and fixedly connected to the bottom of the connecting rod, and two clamping jaws arranged opposite to each other and installed at the bottom of the clamping head, wherein the position of the clamping jaws on the clamping head is adjustable, and a clamping area for clamping the bottom cover is formed between the two clamping jaws; A torque sensor, wherein the torque sensor passes through the upper surface and the lower surface of the workbench and is fixedly connected to the workbench, a detection end of the torque sensor extends out of the upper surface of the workbench and is inserted into the non-circular groove / hole, and an outer contour shape of the detection end of the torque sensor is adapted to an inner contour shape of the non-circular groove / hole; as well as A display device is electrically connected to the torque sensor.

2. The bottom capping machine according to claim 1, characterized in that: Also included is a sound alarm electrically connected to the torque sensor.

3. The bottom capping machine according to claim 2, characterized in that: The sound alarm is a buzzer.

4. The bottom capping machine according to claim 1, characterized in that: The cross section of the detection end of the torque sensor is rectangular, and the cross section of the non-circular slot / hole is rectangular.

5. The bottom capping machine according to claim 1, characterized in that: The frame also includes a bottom plate, which is located below the mounting platform and the stand and is fixedly connected to the mounting platform and the stand respectively, and the non-circular groove / hole is opened on the bottom surface of the bottom plate.

6. The bottom capping machine according to claim 5, characterized in that: The bottom plate is connected to the mounting platform and the vertical frame by screws, or the bottom plate is fixed to the mounting platform and the vertical frame by welding, or the bottom plate, the mounting platform, the vertical frame and the cantilever are integrally formed.

7. The bottom capping machine according to claim 1, characterized in that: A shock-absorbing spring is sleeved on the connecting rod at a position between the handle and the cantilever.

8. The bottom capping machine according to claim 1, characterized in that: The bottom surface of the chuck is provided with a guide groove, and the front side surface of the chuck is provided with a limiting through hole connected with the guide groove, and the tightening assembly also includes a first knob located on the left side of the chuck, a second knob located on the right side of the chuck, a first screw rod that passes through the left side wall of the chuck and is inserted into the guide groove and is fixedly connected to the first knob, a second screw rod that passes through the right side wall of the chuck and is inserted into the guide groove and is fixedly connected to the second knob, a first limiting pin and a second limiting pin that pass through the limiting through hole and are inserted into the guide groove, a first nut that is sleeved on the first screw rod and is respectively fixedly connected to the top of one jaw and the first limiting pin, a second nut that is sleeved on the second screw rod and is respectively fixedly connected to the top of the other jaw and the second limiting pin, and the left side wall and the right side wall of the chuck are respectively provided with threaded holes corresponding to the first screw rod and the second screw rod.

9. The bottom capping machine according to claim 1, characterized in that: A limiting groove is provided on the upper surface of the mounting platform, and the bottom cover screwing machine also includes a locking assembly, which includes a third knob and a fourth knob located at two opposite sides of the mounting platform, a third screw rod penetrating the side wall of the mounting platform and inserted into the limiting groove and fixedly connected to the third knob, a fourth screw rod penetrating the side wall of the mounting platform and inserted into the limiting groove and fixedly connected to the fourth knob, a third nut rotatably sleeved on the third screw rod, a first limiting block located above the mounting platform and fixedly connected to the third nut, a fourth nut rotatably sleeved on the fourth screw rod, a second limiting block located above the mounting platform and fixedly connected to the fourth nut, the lower surface of the first limiting block and the lower surface of the second limiting block respectively abut against the upper surface of the mounting platform, and a watch case clamping area is formed between the first limiting block and the second limiting block.

10. The bottom capping machine according to claim 9, characterized in that: Two opposite sides of the upper surface of the first limit block each have a first installation notch for embedding the lug on one side of the watch case, and two opposite sides of the upper surface of the second limit block each have a second installation notch for embedding the lug on the other side of the watch case.

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