Metal watchcase production line

Abstract

The invention relates to the technical field of intelligent welding systems, and discloses a metal watchcase production line which comprises a base, a transfer seat and an automatic welding robot are fixedly installed on the base, a rotary disc is rotatably installed on the transfer seat, a plurality of material grooves are formed in the rotary disc in the circumferential direction, and the material grooves are used for conveying watchcases; a transfer seat is arranged on the base, a round hole is formed in the transfer seat, the round hole is located in the lower side of the automatic welding robot, a lifting seat is slidably installed on the base, a positioning rod is rotatably installed on the lifting seat, and a sliding groove is formed in the positioning rod. According to the metal watchcase production line, automatic conveying, accurate angular positioning and intelligent welding are integrated, ordered circulation of watchcases is achieved through cooperation of the rotating disc and the material groove, the positioning rod capable of lifting and rotating and a self-adaptive positioning block mechanism are adopted, and accurate angular positioning and fixing of the watchcases are completed by automatically inserting the positioning rod into a watch crown mounting hole at a welding station; therefore, the welding precision and the automation level are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent welding systems, in particular to a metal watchcase production line. BACKGROUND

[0002] Currently, in the production process of metal watchcases, especially in the welding link of watchcases and crown components, semi-automatic or manual assisted assembly line operation mode is generally adopted. The existing production line usually transports watchcases to the welding station by a conveyor belt or a fixed workstation, and then an operator or a simple mechanical hand performs feeding and rough positioning, and then a welding device performs welding operation.

[0003] However, such mode has the following outstanding problems: first, when the watchcase is transported to the welding station, only the center axis can be roughly centered, and the circumferential angular position of the crown mounting hole on the side wall cannot be accurately positioned and fixed. Due to the particularity of the crown mounting hole position (usually located at the asymmetric position of the side edge of the watchcase), if the hole angle is deviated during welding the crown or related accessories, it is easy to cause inaccurate welding position, part interference or insufficient welding strength, which seriously affects the quality and consistency of the finished product. Secondly, there is a lack of reliable clamping and real-time pose adjustment capability of the watchcase during the welding process, and only one side operation of the welding robot is relied on, which is difficult to meet the requirements of complex welds or multi-angle welding, and has poor flexibility. In addition, the feeding and welding processes are not smooth, the automation degree is limited, and the production efficiency and intelligent level are restricted.

[0004] Therefore, an intelligent welding production line capable of realizing automatic transportation of watchcases and automatic identification and accurate angular positioning of the crown mounting hole of the watchcase before welding is needed to improve the welding precision, automation degree and production efficiency. SUMMARY

[0005] The present application provides a metal watchcase production line, which has a metal watchcase production line integrating automatic transportation, accurate angular positioning and intelligent welding. The watchcases are orderly transferred through the cooperation of the turntable and the trough, and the positioning rod and the self-adaptive positioning block mechanism are innovatively used to automatically insert the crown mounting hole at the welding station to complete the accurate angular positioning and fixation of the watchcase, thereby significantly improving the welding precision and automation level, and solving the problems mentioned in the background art.

[0006] The present application provides the following technical scheme: a metal watchcase production line, comprising a base, a transfer seat and an automatic welding robot are fixedly installed on the base, a turntable is rotatably installed on the transfer seat, a plurality of troughs are circumferentially formed on the turntable, and the plurality of troughs are used for conveying watchcases. The transport seat is provided with a circular hole, the circular hole is located at the lower side of the automatic welding robot, a lifting seat is slidably installed on the base, a positioning rod is rotatably installed on the lifting seat, a sliding groove is formed in the positioning rod, a sliding seat is slidably installed in the sliding groove, a positioning block is slidably installed on the sliding seat, and the positioning block is fitted with a crown installing hole on the watch case; A cylinder is fixedly installed on the base, the output end of the cylinder is fixedly connected with the lifting seat, and in the process that the automatic welding robot welds the watch case, the lifting seat is pushed up by the cylinder, so that the positioning block is embedded in the crown installing hole to complete the positioning of the watch case.

[0007] As an optional solution of the metal watch case production line, a first motor, a first belt conveying device and a second belt conveying device are fixedly installed on the base, the output shaft of the first motor is fixedly connected with the rotating disc; The first belt conveying device is used for conveying the un-welded watch case to the rotating disc, and the second belt conveying device is used for conveying the welded watch case away from the rotating disc.

[0008] As an optional solution of the metal watch case production line, a second motor is fixedly installed on the base, a pawl is fixedly installed on the output shaft of the second motor, and two guide plates are fixedly installed on the first belt conveying device.

[0009] As an optional solution of the metal watch case production line, the sliding seat is elastically connected with the inner wall of the positioning rod through a first spring, a limiting rod is fixedly installed on the positioning block, the limiting rod is slidably connected with the sliding seat, and the limiting rod is elastically connected with the sliding seat through a second spring.

[0010] As an optional solution of the metal watch case production line, a limiting groove is formed in the positioning rod, the limiting rod is slidably connected in the limiting groove, the limiting groove comprises a first horizontal groove, an inclined groove and a second horizontal groove which are sequentially communicated from right to left, and the depth of the first horizontal groove is smaller than that of the second horizontal groove.

[0011] As an optional solution of the metal watch case production line, an electric three-jaw chuck is rotatably installed on the lifting seat, three clamping jaws are slidably installed on the electric three-jaw chuck, and the three clamping jaws are synchronously radially displaced based on the central axis of the electric three-jaw chuck to clamp or release the positioning rod; A rotating mechanism is further arranged on the lifting seat, and when the positioning block is embedded in the crown installing hole, the positioning rod and the watch case are driven to rotate by the rotating mechanism for welding.

[0012] As an optional solution of the metal watch shell production line, the rotating mechanism comprises a third motor fixedly installed on the positioning rod, a first gear fixedly installed on an output shaft of the third motor, a connecting ring fixedly installed on the motorized three-jaw chuck, a second gear fixedly installed on the connecting ring, and the second gear is engaged with the first gear.

[0013] As an optional solution of the metal watch shell production line, the connecting ring is rotatably installed on the motorized three-jaw chuck, an arc-shaped slot is formed in the connecting ring, an arc-shaped block is fixedly installed on the second gear, the arc-shaped block is slidably connected in the arc-shaped slot, and the arc-shaped block is elastically connected with an inner wall of the arc-shaped slot through a third spring.

[0014] As an optional solution of the metal watch shell production line, the arc-shaped block is in contact with an inner wall located in a counterclockwise direction of the arc-shaped slot through the elastic support of the third spring, a sensor is fixedly installed in the arc-shaped slot, and the sensor is in contact with the third spring to detect the change of the elastic force.

[0015] As an optional solution of the metal watch shell production line, when the crown mounting hole on the watch shell is positioned, the positioning rod is driven to rotate clockwise by the rotating mechanism. When the watch shell is welded, the positioning rod is driven to rotate counterclockwise by the rotating mechanism.

[0016] The present application has the following advantages: 1. The metal watch shell production line realizes automatic and orderly flow and accurate positioning of the watch shell. The circumferential groove formed in the rotating disc is arranged on the first belt conveyor, the second belt conveyor and the rotating disc driven by the first motor. The watch shell from the first belt conveyor is conveyed to the welding station in a step-by-step manner, and then conveyed out by the second belt conveyor after welding, forming a continuous automatic flow operation. In particular, the guide plate arranged on the first belt conveyor and the equidistant separation mechanism driven by the second motor and provided with a pawl ensure that the watch shell enters the rotating disc in an orderly and evenly spaced manner, laying a good foundation for accurate positioning, greatly improving the production efficiency and process stability.

[0017] 2、The metal watch case production line realizes automatic, self-adaptive and accurate angular positioning of the watch case crown mounting hole. In the welding station, the lifting seat is driven to rise by the cylinder, and the positioning rod and the positioning block on it approach the watch case. The positioning block is designed to match the shape of the crown mounting hole. When the crown mounting hole is not aligned, the positioning block contacts the edge of the watch case. At this time, in the positioning rod, through the cooperation of the limiting rod and the specially designed limiting groove (including the first horizontal groove, the inclined groove and the second horizontal groove), and the elastic action of the first spring and the second spring, the positioning rod is allowed to rotate to find the correct angle under the drive of the rotating mechanism. Once the positioning block is aligned and embedded in the crown mounting hole, the limiting rod slides into the second horizontal groove, and the mechanism is locked, thereby firmly and accurately fixing the angular position of the watch case, solving the problem of accurate positioning of the key feature hole before welding and ensuring the consistency of the welding quality.

[0018] 3、The metal watch case production line provides intelligent and flexible welding posture adjustment and process buffer function. The rotating mechanism is composed of a third motor, a first gear, a second gear, a connecting ring, an arc-shaped groove integrated with a third spring and a sensor, and an arc-shaped block structure. The mechanism clamps the positioning rod by the electric three-jaw chuck. In the positioning finding stage, the third motor drives the gear pair, and the torque is transmitted through the compression of the third spring, providing flexible rotary drive and contact buffer, and the sensor monitors the spring force change to judge whether the positioning block is successfully embedded, realizing intelligent detection. In the welding stage, the positioning rod and the fixed watch case can be driven counterclockwise by the rotating mechanism, which facilitates the multi-angle and omnidirectional welding of the automatic welding robot, improving the flexibility and quality of welding. The whole positioning and rotating process is automated and controllable, fully embodying the intelligence of the production line. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the overall structural schematic diagram of the present application.

[0020] Figure 2 It is the sectional view structural schematic diagram of the turntable in the present application.

[0021] Figure 3 It is the partial enlarged structural schematic diagram of A in the present application. Figure 2

[0022] Figure 4 It is the structural schematic diagram of the local part of the turntable in the present application.

[0023] Figure 5 It is the sectional view structural schematic diagram of the rotating mechanism in the present application.

[0024] Figure 6 It is the partial enlarged structural schematic diagram of B in the present application. Figure 5

[0025] Figure 7 ​​The first explosion structure schematic diagram of the present application.

[0026] Figure 8 The second explosion structure schematic diagram of the present application.

[0027] In the figure: 1, base; 101, transfer seat; 102, automatic welding robot; 103, turntable; 104, trough; 105, first motor; 106, first belt conveyor; 107, second belt conveyor; 108, second motor; 109, gear; 110, guide plate; 2, round hole; 3, lifting seat; 301, positioning rod; 302, air cylinder; 303, sliding groove; 304, sliding seat; 305, positioning block; 306, first spring; 307, limiting rod; 308, second spring; 309, limiting groove; 310, first horizontal groove; 311, inclined groove; 312, second horizontal groove; 313, electric three-jaw chuck; 314, jaw; 4, rotating mechanism; 401, third motor; 402, first gear; 403, connecting ring; 404, second gear; 405, arc-shaped groove; 406, arc-shaped block; 407, third spring; 408, sensor. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0029] Embodiment one, please refer to Figures 1-7 A metal watch case production line, comprising a base 1, the base 1 is fixedly installed with a transfer seat 101 and an automatic welding robot 102, the transfer seat 101 is rotatably installed with a turntable 103, the turntable 103 is circumferentially provided with a plurality of troughs 104, and the plurality of troughs 104 are used for conveying watch cases.

[0030] The transfer seat 101 is provided with a round hole 2, the round hole 2 is located at the lower side of the automatic welding robot 102, the base 1 is slidably installed with a lifting seat 3, the lifting seat 3 is rotatably installed with a positioning rod 301, the positioning rod 301 is provided with a sliding groove 303, the sliding groove 303 is slidably installed with a sliding seat 304, the sliding seat 304 is slidably installed with a positioning block 305, and the positioning block 305 is fitted with a crown installation hole on the watch case.

[0031] The base 1 is fixedly installed with an air cylinder 302, the output end of the air cylinder 302 is fixedly connected with the lifting seat 3, and in the process that the automatic welding robot 102 welds the watch case, the lifting seat 3 is pushed up by the air cylinder 302, so that the positioning block 305 is embedded into the crown installation hole to complete the positioning of the watch case.

[0032] A first motor 105, a first belt conveyor 106, and a second belt conveyor 107 are fixedly installed on the base 1. The output shaft of the first motor 105 is fixedly connected to the turntable 103.

[0033] The first belt conveyor 106 is used to convey the unwelded watch case to the turntable 103, and the second belt conveyor 107 is used to convey the welded watch case from the turntable 103.

[0034] A second motor 108 is fixedly installed on the base 1, and a gear 109 is fixedly installed on the output shaft of the second motor 108. Two guide plates 110 are fixedly installed on the first belt conveyor 106.

[0035] In this embodiment: the first belt conveyor 106 can be connected to the upstream of the watch case production line. The first belt conveyor 106 can be composed of pulleys, belts, motors, etc. A large number of watch cases are arranged from right to left on the belt of the first belt conveyor 106 and conveyed to the left. When passing the guide tooth 109, the guide tooth 109 can be driven to rotate by the second motor 108. The guide tooth 109 has multiple semi-circular grooves that fit with the watch cases. Each time it rotates through one semi-circular groove, a large number of watch cases can be conveyed to the left at equal intervals. During the conveying process, two guide plates 110 clamp the watch cases in the middle, which can complete the initial positioning of the watch cases.

[0036] When a watch case arrives at the transfer seat 101 and falls into one of the material troughs 104, the first motor 105 installed on the ground drives the turntable 103 to rotate, which can transport the watch cases one by one in a clockwise direction.

[0037] When the watch case rotates clockwise half a turn to the position of the automatic welding robot 102 on the left, the inner hole of the watch case is aligned with the circular hole 2. At this point, the first belt conveyor 106 and the turntable 103 are stopped. The lifting mechanism 3 is then raised as a whole by the cylinder 302.

[0038] Although the turntable 103 and material trough 104 position the central axis of the watch case during the conveying process, there may be welding requirements for specific structures on the watch case, such as when the watch crown is welded to the watch case by the automatic welding robot 102, the position of the crown positioning hole needs to be precisely positioned. Therefore, during the lifting process, the positioning block 305 can be automatically aligned with the crown positioning hole on the watch case and inserted through a specific structural setting (refer to Embodiment 2). This completes the positioning of the watch case.

[0039] After welding is completed, the turntable 103 continues to run clockwise to transport the welded watch case to the second belt conveyor 107. When the watch case is delivered to the second belt conveyor 107, it detaches from the turntable 103 and falls onto the second belt conveyor 107. The second belt conveyor 107 then transports the welded watch case from right to left to the downstream of the watch case production line.

[0040] It should be noted that the first belt conveyor 106, the second belt conveyor 107, and the automatic welding robot 102 mentioned above are conventional technical means, and their specific structures and working principles will not be described in detail.

[0041] Example 2, please refer to Figures 1-7 The slide block 304 is elastically connected to the inner wall of the positioning rod 301 via the first spring 306. A limit rod 307 is fixedly installed on the positioning block 305. The limit rod 307 is slidably connected to the slide block 304. The limit rod 307 is elastically connected to the slide block 304 via the second spring 308.

[0042] A limiting groove 309 is provided in the positioning rod 301, and the limiting rod 307 is slidably connected in the limiting groove 309. The limiting groove 309 includes a first horizontal groove 310, an inclined groove 311 and a second horizontal groove 312 connected sequentially from right to left. The depth of the first horizontal groove 310 is less than that of the second horizontal groove 312.

[0043] An electric three-jaw chuck 313 is rotatably mounted on the lifting seat 3. Three jaws 314 are slidably mounted on the electric three-jaw chuck 313. The three jaws 314 make synchronous radial displacement based on the central axis of the electric three-jaw chuck 313 to clamp or release the positioning rod 301.

[0044] The lifting seat 3 is also equipped with a rotating mechanism 4. When the positioning block 305 is embedded in the crown mounting hole, the rotating mechanism 4 drives the positioning rod 301 and the watch case to rotate for welding.

[0045] In this embodiment: As shown in the figure, the initial position of the positioning block 305 is set to the left. If a watch case is delivered to the position of the circular hole 2, and the crown mounting hole is also located on the left, the positioning rod 301 is moved upwards but not rotated. At this time, the positioning block 305 and the crown mounting hole are perfectly engaged.

[0046] If the initial position of the positioning block 305 does not perfectly align with the crown mounting hole, the positioning block 305 will abut against the edge of the watch case. Since the limiting rod 307 is in the first horizontal groove 310 at this time, the limiting rod 307 and the positioning block 305 cannot move to the right. At this time, the rising of the positioning rod 301 will cause the positioning block 305 and the slide 304 to move downward together relative to the positioning rod 301.

[0047] At this time, the control positioning rod 301 moves upward and rotates clockwise. Then, when the positioning rod 301 rotates to a certain angle, the positioning block 305 will be aligned with the crown mounting hole, and the positioning block 305 will also be embedded in the crown mounting hole.

[0048] The positioning rod 301, positioning block 305, and slide 304 are pushed upward together. The limiting rod 307 passes through the inclined groove 311 and enters the second horizontal groove 312. When the slide 304 reaches the bottom of the slide groove 303, the limiting rod 307 is not limited and can move to the right, while the slide 304 is restricted from moving downward.

[0049] Until welding is completed, the cylinder 302 drives the lifting seat 3 to descend as a whole, and the positioning block 305 disengages from the crown mounting hole. At this time, the slide 304 is pulled back to the right by the rebound force of the first spring 306 to the far right of the slide groove 303. At the same time, the limit rod 307 also moves along the second horizontal groove 312, the inclined groove 311 and the first horizontal groove 310 to reset.

[0050] Example 3, please refer to Figures 1-8 The rotating mechanism 4 includes a third motor 401 fixedly mounted on the positioning rod 301. A first gear 402 is fixedly mounted on the output shaft of the third motor 401. A connecting ring 403 is fixedly mounted on the electric three-jaw chuck 313. A second gear 404 is fixedly mounted on the connecting ring 403. The second gear 404 meshes with the first gear 402.

[0051] The connecting ring 403 is rotatably mounted on the electric three-jaw chuck 313. The connecting ring 403 has an arc-shaped groove 405. An arc-shaped block 406 is fixedly mounted on the second gear 404. The arc-shaped block 406 is slidably connected in the arc-shaped groove 405. The arc-shaped block 406 is elastically connected to the inner wall of the arc-shaped groove 405 through a third spring 407.

[0052] The third spring 407 provides elastic support, causing the arc-shaped block 406 to contact the inner wall of the arc-shaped groove 405 on the counterclockwise side. A sensor 408 is fixedly installed in the arc-shaped groove 405, and the sensor 408 contacts the third spring 407 to detect changes in its elastic force.

[0053] When positioning the crown mounting hole on the watch case, the positioning rod 301 is driven to rotate clockwise by the rotating mechanism 4.

[0054] During the welding of the watch case, the positioning rod 301 is driven to rotate counterclockwise by the rotating mechanism 4.

[0055] In this embodiment: by controlling the operation of the electric three-jaw chuck 313, the three jaws 314 of the electric three-jaw chuck 313 clamp the positioning rod 301. The electric three-jaw chuck 313 has a hollow center. The electric three-jaw chuck 313 can also be a pneumatic, hydraulic, or other automatic three-jaw chuck. As a conventional technical means, its specific structure and working principle will not be described in detail.

[0056] Since the crown mounting hole may be at various positions around the circumference when the positioning block 305 contacts the watch case, the positioning rod 301 needs to be rotated at different angles depending on the situation.

[0057] Specifically, after the electric three-jaw chuck 313 clamps the positioning rod 301, the third motor 401 does not operate initially, fixing the positions of the first gear 402 and the second gear 404, at which point the position of the positioning rod 301 is also fixed. Only when the positioning block 305 contacts the watch case does the third motor 401 control the first gear 402 to rotate counterclockwise, causing the second gear 404 and the arc-shaped block 406 to rotate clockwise.

[0058] The arc-shaped block 406 is initially positioned on one side of the arc-shaped groove 405 in the counterclockwise direction. At this time, the arc-shaped block 406 rotates clockwise along the arc-shaped groove 405, which will compress the third spring 407 and simultaneously drive the connecting ring 403 and the electric three-jaw chuck 313 to rotate clockwise.

[0059] If the crown mounting hole is initially in the left position, the positioning block 305 will be embedded in the crown mounting hole from the beginning. At this time, the connecting ring 403 and the electric three-jaw chuck 313 cannot rotate clockwise, and the third spring 407 will be further compressed, which plays a buffering role.

[0060] The force on the third spring 407 can be measured by sensor 408, or a negative feedback adjustment device can be installed at the end of the third motor 401 to determine the contact between the positioning hole 305 and the watch case.

[0061] If the crown mounting hole is not initially in the left position, the positioning rod 301 will rotate a certain angle, and the positioning block 305 will then be inserted into the crown mounting hole. At this time, the electric three-jaw chuck 313 will not be able to continue to rotate clockwise, the third spring 407 will be further compressed, and then the third motor 401 will be controlled to stop running.

[0062] During the welding of the watch case, the third motor 401 can be controlled to drive the first gear 402 to rotate clockwise and the second gear 404 to rotate counterclockwise. Since the arc-shaped block 406 is in contact with the inner wall of the arc-shaped groove 405 in the counterclockwise direction, the third spring 407 will not be compressed at this time. The arc-shaped block 406 will immediately drive the connecting ring 403 and the electric three-jaw chuck 313 to rotate counterclockwise, thereby driving the positioning rod 301 and the watch case to rotate counterclockwise.

[0063] The rotating case allows for rotation during welding.

[0064] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0065] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A metal watch case production line, comprising a base (1), characterized in that: A transfer seat (101) and an automatic welding robot (102) are fixedly installed on the base (1). A turntable (103) is rotatably installed on the transfer seat (101). Several material troughs (104) are circumferentially opened on the turntable (103). Several material troughs (104) are used to transport the watch case. The transfer seat (101) has a circular hole (2) located on the lower side of the automatic welding robot (102). A lifting seat (3) is slidably installed on the base (1). A positioning rod (301) is rotatably installed on the lifting seat (3). A sliding groove (303) is provided on the positioning rod (301). A sliding block (304) is slidably installed in the sliding groove (303). A positioning block (305) is slidably installed on the sliding block (304). The positioning block (305) fits into the crown mounting hole on the watch case. A cylinder (302) is fixedly installed on the base (1). The output end of the cylinder (302) is fixedly connected to the lifting seat (3). During the welding process of the automatic welding robot (102) on the watch case, the cylinder (302) pushes the lifting seat (3) to rise, so that the positioning block (305) is embedded in the crown mounting hole to complete the positioning of the watch case.

2. The metal watch case production line according to claim 1, characterized in that: The base (1) is fixedly installed with a first motor (105), a first belt conveyor (106), and a second belt conveyor (107). The output shaft of the first motor (105) is fixedly connected to the turntable (103). The first belt conveyor (106) is used to convey the unwelded watch case to the turntable (103), and the second belt conveyor (107) is used to convey the welded watch case from the turntable (103).

3. A metal watch case production line according to claim 2, characterized in that: A second motor (108) is fixedly installed on the base (1), and a gear (109) is fixedly installed on the output shaft of the second motor (108). Two guide plates (110) are fixedly installed on the first belt conveyor (106).

4. A metal watch case production line according to claim 1, characterized in that: The slide block (304) is elastically connected to the inner wall of the positioning rod (301) via a first spring (306). A limiting rod (307) is fixedly installed on the positioning block (305). The limiting rod (307) is slidably connected to the slide block (304). The limiting rod (307) is elastically connected to the slide block (304) via a second spring (308).

5. A metal watch case production line according to claim 4, characterized in that: The positioning rod (301) has a limiting groove (309) inside, and the limiting rod (307) is slidably connected in the limiting groove (309). The limiting groove (309) includes a first horizontal groove (310), an inclined groove (311), and a second horizontal groove (312) connected sequentially from right to left. The depth of the first horizontal groove (310) is less than that of the second horizontal groove (312).

6. A metal watch case production line according to claim 5, characterized in that: An electric three-jaw chuck (313) is rotatably mounted on the lifting seat (3), and three jaws (314) are slidably mounted on the electric three-jaw chuck (313). The three jaws (314) perform synchronous radial displacement based on the central axis of the electric three-jaw chuck (313) to clamp or release the positioning rod (301). The lifting seat (3) is also provided with a rotating mechanism (4). When the positioning block (305) is embedded in the crown mounting hole, the rotating mechanism (4) drives the positioning rod (301) and the watch case to rotate for welding.

7. A metal watch case production line according to claim 6, characterized in that: The rotating mechanism (4) includes a third motor (401) fixedly mounted on the positioning rod (301), a first gear (402) fixedly mounted on the output shaft of the third motor (401), a connecting ring (403) fixedly mounted on the electric three-jaw chuck (313), and a second gear (404) fixedly mounted on the connecting ring (403), the second gear (404) meshing with the first gear (402).

8. A metal watch case production line according to claim 7, characterized in that: The connecting ring (403) is rotatably mounted on the electric three-jaw chuck (313). An arc-shaped groove (405) is provided on the connecting ring (403). An arc-shaped block (406) is fixedly mounted on the second gear (404). The arc-shaped block (406) is slidably connected in the arc-shaped groove (405). The arc-shaped block (406) is elastically connected to the inner wall of the arc-shaped groove (405) through a third spring (407).

9. A metal watch case production line according to claim 8, characterized in that: The third spring (407) provides elastic support, causing the arc-shaped block (406) to contact the inner wall of the arc-shaped groove (405) on the counterclockwise side. A sensor (408) is fixedly installed in the arc-shaped groove (405), and the sensor (408) contacts the third spring (407) to detect changes in its elastic force.

10. A metal watch case production line according to claim 9, characterized in that: When positioning the crown mounting hole on the watch case, the positioning rod (301) is driven to rotate clockwise by the rotating mechanism (4); When welding the watch case, the positioning rod (301) is driven to rotate counterclockwise by the rotating mechanism (4).

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