Pin correction device

By designing a pin correction device for crystal oscillator production, the pins of the crystal oscillator base are automatically corrected using the clamping mechanism to solve the problems of low manual correction efficiency and poor consistency, achieving more efficient production and better product performance.

CN120190293APending Publication Date: 2025-06-24GUANGDONG DAPU TELECOM TECH CO LTD
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Patent Information

Application Number
CN202510391671.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-31
Publication Date
2025-06-24

AI Technical Summary

Technical Problem

During the crystal oscillator production process, the pins of the crystal oscillator base are low efficiency and poor consistency, which affects product performance.

Method used

A pin correction device is designed, including a base, a support table and a clamping mechanism. The clamping mechanism consists of a first driving assembly, a second driving assembly and two clamping jaws. The driving assembly drives the clamping jaws to move in the vertical direction, thereby achieving automated correction of the tilted or bending pins.

Benefits of technology

Improves the consistency after pin correction, improves production efficiency, and facilitates assembly with PCBA boards, improving the product performance of crystal oscillators.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention belongs to the technical field of crystal oscillator production, and discloses a pin correction device. The pin correcting device comprises a base, a supporting table and a clamping mechanism, the supporting table is arranged on the base and used for placing a crystal oscillator base, the clamping mechanism comprises a first driving assembly, a second driving assembly and two clamping jaws, the first driving assembly is arranged on the base, the second driving assembly is arranged at the output end of the first driving assembly, and the two clamping jaws are arranged on the supporting table. The first driving assembly is used for driving the second driving assembly to drive the clamping jaws to move in the first direction, and the second driving assembly is used for driving the two clamping jaws to get close to each other in the second direction so that the two clamping jaws can jointly clamp the pins on the crystal oscillator base. According to the pin correction device provided by the invention, the inclined or bent pin can be corrected through the clamping action, so that automatic correction is realized, the production efficiency is improved, the consistency of the corrected pin can be improved, the pin correction device is more convenient to assemble with a PCBA (Printed Circuit Board Assembly), and the product performance of a crystal oscillator is improved.
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Description

Technical Field

[0001] The present invention relates to the technical field of crystal oscillator production, and particularly to a pin correction device. Background Art

[0002] As Figure 1 shown in the figure, during the current production of crystal oscillators, it is necessary to assemble the crystal oscillator base 10 and the PCBA board 20 together. When the pins 101 of the crystal oscillator base 10 are inclined or bent, it is necessary to manually hold the tweezers for correction and then insert them into the corresponding holes of the PCBA board 20. This manual correction method has low efficiency and poor correction consistency, which is likely to affect the product performance of the crystal oscillator.

[0003] Therefore, there is an urgent need to provide a pin correction device to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a pin correction device, which can improve the consistency after pin correction, is more convenient for assembly with the PCBA board, and improves the production efficiency.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A pin correction device, comprising:

[0007] A base;

[0008] A support platform, which is arranged on the base and is used for placing the crystal oscillator base;

[0009] A clamping mechanism, comprising a first driving component, a second driving component and two clamping jaws. The first driving component is arranged on the base, the second driving component is arranged at the output end of the first driving component. The first driving component is used to drive the second driving component to drive the clamping jaws to move along a first direction, and the second driving component is used to drive the two clamping jaws to approach each other in a second direction, so that the two clamping jaws jointly clamp the pins on the crystal oscillator base. The first direction is perpendicular to the second direction.

[0010] As an optional solution, cam grooves are respectively formed on the opposite sides of the two clamping jaws. The second driving component includes two follower components respectively cooperating with the corresponding cam grooves. The follower component includes a connecting block, a rotating shaft and a follower bearing. The connecting block is connected to the output end of the first driving component. The rotating shaft is erected on the connecting block. The follower bearing is rotatably arranged on the rotating shaft. The follower bearing is located in the cam groove and can cooperate with the side wall of the cam groove. The two follower bearings can drive the two clamping jaws to approach each other in the second direction while driving the corresponding clamping jaws to move along the first direction.

[0011] As an alternative solution, the first driving assembly includes a driving member and a mounting plate. The driving member is disposed on the base, the mounting plate is connected to the output shaft of the driving member, the second driving assembly is disposed on the mounting plate, and the driving member can drive the mounting plate to move along the first direction.

[0012] As an alternative solution, a transfer member is connected to the output shaft of the driving member. The transfer member includes a large-diameter section and a small-diameter section, and a step is formed at the junction of the large-diameter section and the small-diameter section. A connection groove is formed on the mounting plate. The connection groove sequentially includes a second groove and a first groove that are connected and communicated from the side close to the driving member. The size of the first groove in the second direction is larger than that of the second groove. The large-diameter section is located in the first groove, the small-diameter section is located in the second groove, and the step can abut against the side wall of the first groove.

[0013] As an alternative solution, the clamping mechanism further includes a first guiding assembly. The first guiding assembly includes a first guide rail and a first slider. The first guide rail is disposed on the base and extends along the first direction. The first slider is connected to the bottom of the mounting plate and is slidably connected to the first guide rail.

[0014] As an alternative solution, an elastic resetting member is connected between the two jaws.

[0015] As an alternative solution, the two jaws are defined as a first jaw and a second jaw respectively. Two first clamping portions are formed at the end of the first jaw and are spaced apart along the second direction. Two second clamping portions are formed at the end of the second jaw and are spaced apart along the second direction. The first clamping portions and the second clamping portions are arranged in one-to-one correspondence, and each first clamping portion and the corresponding second clamping portion are used to clamp one pin.

[0016] As an alternative solution, the clamping mechanism further includes a second guiding assembly. The second guiding assembly includes a second guide rail and a second slider. The second guide rail extends along the second direction. The second slider is connected to the bottom of the jaw and is slidably connected to the second guide rail.

[0017] As an alternative solution, the clamping mechanism further includes a third guiding assembly. The third guiding assembly includes a third guide rail, a third slider, and a connecting plate. The third guide rail is disposed on the base and extends along the first direction. The third slider is connected to the bottom of the connecting plate and is slidably connected to the third guide rail. The second guide rail is connected to the connecting plate.

[0018] As an alternative solution, two clamping mechanisms are provided, and the two clamping mechanisms are symmetrically arranged along the first direction.

[0019] Advantages of the present invention:

[0020] The present invention provides a pin correction device. When in use, first place the crystal oscillator base on the support table, and then drive the second drive assembly to move along the X-axis direction through the first drive assembly. The second drive assembly drives the two jaws to move along the X-axis direction, so that the jaws approach the pins. While approaching the pins, the second drive assembly drives the two jaws to approach each other in the second direction, so that the two jaws jointly clamp the pins on the crystal oscillator base, thereby correcting the inclined or bent pins through the clamping action, realizing automatic correction, improving production efficiency, and being able to improve the consistency after pin correction, making it more convenient to assemble with the PCBA board and enhancing the product performance of the crystal oscillator. Description of the drawings

[0021] Figure 1 is a schematic structural diagram of the cooperation between the crystal oscillator base and the PCBA board provided by the embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of the pin correction device provided by the embodiment of the present invention;

[0023] Figure 3 is Figure 2 a partial enlarged view of A in

[0024] Figure 4 is a schematic structural diagram of the cooperation between the jaw and the follower bearing provided by the embodiment of the present invention;

[0025] Figure 5 is Figure 2 a partial enlarged view of B in

[0026] Figure 6 is a partial structural diagram of the pin correction device provided by the embodiment of the present invention.

[0027] In the figure:

[0028] 10. Crystal oscillator base; 101. Pin; 20. PCBA board;

[0029] 1. Base;

[0030] 2. Support table;

[0031] 3. Clamping mechanism; 31. First driving component; 311. Driving part; 312. Mounting plate; 3121. Connecting groove; 31211. First groove; 31212. Second groove; 313. Adapter; 3131. Large-diameter section; 3132. Small-diameter section; 3133. Step; 32. Second driving component; 321. Follow-up part; 3211. Connecting block; 3212. Rotating shaft; 3213. Follow-up bearing; 33. Jaw; 331. Cam groove; 332. First jaw; 3321. First clamping part; 333. Second jaw; 3331. Second clamping part; 34. Elastic resetting part; 35. First guiding component; 351. First guide rail; 352. First slider; 36. Second guiding component; 361. Second guide rail; 362. Second slider; 37. Third guiding component; 371. Third guide rail; 372. Third slider; 373. Connecting plate. Detailed implementation mode

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0033] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operations, 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. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] As Figure 1 shown, during the current production process of crystal oscillators, it is necessary to assemble the crystal oscillator base 10 and the PCBA board 20 together. Four pins 101 are provided on each crystal oscillator base 10. When the pins 101 of the crystal oscillator base 10 are inclined or bent, it is necessary to manually use tweezers to correct them and then insert them into the corresponding holes of the PCBA board 20. This manual correction method has low efficiency and poor correction consistency, which is likely to affect the product performance of the crystal oscillator.

[0037] To solve the above problems, this embodiment provides a pin correction device, which can improve the consistency after the pins 101 are corrected, is more convenient for assembling with the PCBA board 20, improves the product performance of the crystal oscillator, and improves the production efficiency.

[0038] Specifically, as Figure 2 shown, the pin 101 correction device includes a base 1, a support table 2, and a clamping mechanism 3. The support table 2 is arranged on the base 1 and is used to place the crystal oscillator base 10. The clamping mechanism 3 includes a first driving component 31, a second driving component 32, and two clamping jaws 33. The first driving component 31 is arranged on the base 1, and the second driving component 32 is arranged at the output end of the first driving component 31. The first driving component 31 is used to drive the second driving component 32 to drive the clamping jaws 33 to move along the first direction, and the second driving component 32 is used to drive the two clamping jaws 33 to approach each other in the second direction so that the two clamping jaws 33 jointly clamp the pins 101 on the crystal oscillator base 10. The first direction is perpendicular to the second direction. For the convenience of understanding, in this embodiment, the first direction is defined as Figure 2 the X-axis direction in Figure 2 and the second direction is the Y-axis direction in

[0039] In use, first place the crystal oscillator base 10 on the support table 2, and then drive the second drive assembly 32 to move in the X-axis direction through the first drive assembly 31. The second drive assembly 32 drives the two jaws 33 to move in the X-axis direction, so that the jaws 33 approach the pin 101. While approaching the pin 101, the second drive assembly 32 drives the two jaws 33 to approach each other in the second direction, so that the two jaws 33 jointly clamp the pin 101 on the crystal oscillator base 10, thereby correcting the inclined or bent pin 101 through the clamping action, realizing automatic correction, improving production efficiency, and being able to improve the consistency of the pins 101 after correction, making it more convenient to assemble with the PCBA board 20, and further improving the product performance of the crystal oscillator.

[0040] As Figure 2 shown, in this embodiment, two clamping mechanisms 3 are provided, the support table 2 is arranged at the middle position of the base 1, and the two clamping mechanisms 3 are arranged at intervals in the first direction and symmetrically arranged with respect to the support table 2. The two clamping mechanisms 3 perform correction simultaneously, improving work efficiency.

[0041] Specifically, as Figure 1 shown, the first drive assembly 31 includes a drive member 311 and a mounting plate 312. The drive member 311 is arranged on the base 1, the mounting plate 312 is connected to the output shaft of the drive member 311, the second drive assembly 32 is arranged on the mounting plate 312, and the drive member 311 can drive the mounting plate 312 to move in the first direction, thereby driving the second drive assembly 32 to move in the first direction. In this embodiment, the drive member 311 can be selected as a cylinder, which has a compact structure, light weight, and small occupied space. In other alternative embodiments, the drive member 311 can also be selected as a linear motor or other drive structures capable of realizing linear movement.

[0042] In this embodiment, a floating connection is adopted between the output shaft of the drive member 311 and the mounting plate 312. Specifically, as Figure 3As shown, a transfer member 313 is connected to the output shaft of the driving member 311. The transfer member 313 includes a large-diameter section 3131 and a small-diameter section 3132. A step 3133 is formed at the junction of the large-diameter section 3131 and the small-diameter section 3132. A connection groove 3121 is formed on the mounting plate 312. The connection groove 3121 sequentially includes a second groove 31212 and a first groove 31211 that are connected and communicate with each other from the side close to the driving member 311. The dimension of the first groove 31211 in the second direction is greater than that of the second groove 31212. The large-diameter section 3131 is located in the first groove 31211, and the small-diameter section 3132 is located in the second groove 31212. The step 3133 can abut against the side wall of the first groove 31211. When the output shaft of the air cylinder drives the transfer member 313 to move in the first direction, through the cooperation of the large-diameter section 3131 and the first groove 31211, the mounting plate 312 can be driven to move in the first direction. This floating connection method can prevent over-positioning and cause the air cylinder to be stuck.

[0043] Combined with Figure 2 and Figure 4 , in order to realize the clamping actions of the two jaws 33, cam grooves 331 are respectively formed on the opposite sides of the two jaws 33. The second driving assembly 32 includes two follower members 321 respectively cooperating with the corresponding cam grooves 331. The follower member 321 includes a connection block 3211, a rotating shaft 3212, and a follower bearing 3213. The connection block 3211 is connected to the output end of the first driving assembly 31. The rotating shaft 3212 is erected on the connection block 3211. The follower bearing 3213 is rotatably arranged on the rotating shaft 3212. The follower bearing 3213 is located in the cam groove 331 and can cooperate with the side wall of the cam groove 331. The two follower bearings 3213 can drive the corresponding jaws 33 to move closer to each other in the second direction while driving the corresponding jaws 33 to move in the first direction.

[0044] When the first driving assembly 31 drives the two follower bearings 3213 to move in the positive X-axis direction, the follower bearings 3213 cooperate with the curved surface profile of the corresponding cam grooves 331. While pushing the jaws 33 to approach the lead 101 in the X-axis direction, the two jaws 33 are driven to approach each other so that the two jaws 33 jointly clamp the lead 101, thereby correcting the inclined or bent lead 101 through the clamping action. In this way, through one driving member 311 cooperating with two follower members 321, the clamping actions of the two jaws 33 can be realized, saving the driving structure for driving in the second direction, thus saving costs and reducing the size of the device. Moreover, the rolling friction between the follower bearing 3213 and the cam groove 331 reduces the frictional force and extends the service life of the components.

[0045] In other alternative embodiments, the use of the connection block 3211 can also be cancelled, and the rotating shaft 3212 can be directly connected to the mounting plate 312.

[0046] Further, as Figure 2 shown, a plurality of elastic reset members 34 are connected between the two jaws 33. When the output shaft of the cylinder retracts, it drives the follower bearing 3213 to move in the positive X-axis direction. The follower bearing 3213 pushes the jaws 33 to approach the pin 101 in the positive X-axis direction, and at the same time drives the two jaws 33 to approach each other against the elastic force of the elastic reset members 34, thereby clamping the pin 101 to achieve correction. After the correction is completed, the output shaft of the cylinder extends and drives the follower bearing 3213 to move in the negative X-axis direction. At the same time, under the action of the elastic reset members 34, the two jaws 33 move away from each other to release the pin 101, and then the follower bearing 3213 drives the jaws 33 in the negative X-axis direction, so that the jaws 33 are reset after moving away from the pin 101.

[0047] In this embodiment, the elastic reset member 34 is a spring. In other alternative embodiments, the elastic reset member 34 can also be a reset spring sheet or other elastic members with a reset function.

[0048] Further, as Figure 2 and Figure 5 shown, the two jaws 33 are defined as a first jaw 332 and a second jaw 333 respectively. Two first clamping portions 3321 are formed at the end of the first jaw 332 and are arranged at intervals along the second direction. Two second clamping portions 3331 are formed at the end of the second jaw 333 and are arranged at intervals along the second direction. The first clamping portions 3321 and the second clamping portions 3331 are arranged in one-to-one correspondence, and each first clamping portion 3321 and the corresponding second clamping portion 3331 are used to clamp a pin 101. In this way, each clamping mechanism 3 can simultaneously achieve the clamping and correction of two pins 101, and two opposite clamping mechanisms 3 can simultaneously achieve the correction of four pins 101. Therefore, the correction of the four pins 101 on a crystal oscillator base 10 can be completed at one time, greatly improving the work efficiency.

[0049] As Figure 2 and Figure 6 shown, the clamping mechanism 3 further includes a first guiding component 35. The first guiding component 35 includes a first guide rail 351 and a first slider 352. The first guide rail 351 is arranged on the base 1 and extends along the first direction. The first slider 352 is connected to the bottom of the mounting plate 312 and is slidably connected to the first guide rail 351. The first guiding component 35 can play a guiding role in the X-axis direction for the mounting plate 312, making the movement of the mounting plate 312 smoother and more stable.

[0050] In this embodiment, two first guiding components 35 are provided. The two first guiding components 35 are arranged at intervals in the Y-axis direction to play a stable guiding role. In other alternative embodiments, the first guiding component 35 can also be provided as one, three or more, and can be adaptively selected according to actual needs, and no specific limitation is made here.

[0051] Further, as Figure 6 shown, the clamping mechanism 3 further includes a second guiding component 36. The second guiding component 36 includes a second guide rail 361 and two second sliders 362. The second guide rail 361 extends along the second direction. The two second sliders 362 are respectively connected to the bottom of the corresponding jaw 33 and are both slidably connected to the second guide rail 361. The second guiding component 36 can play a guiding role in the Y-axis direction for the two jaws 33, so that the jaws 33 move more smoothly and stably in the Y-axis direction.

[0052] As Figure 6 shown, the clamping mechanism 3 further includes a third guiding component 37. The third guiding component 37 is located in the middle of the two first guiding components 35 to avoid interference. The third guiding component 37 includes a third guide rail 371, a third slider 372 and a connecting plate 373. The third guide rail 371 is arranged on the base 1 and extends along the first direction. The third slider 372 is connected to the bottom of the connecting plate 373 and is slidably connected to the third guide rail 371. The second guide rail 361 is connected to the connecting plate 373. The third guiding component 37 can play a guiding role in the X-axis direction for the jaws 33, so that the jaws 33 move more smoothly and stably in the X-axis direction.

[0053] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the embodiments of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A pin correction device, characterized in that: include: Base (1); A support platform (2) is arranged on the base (1) and is used to place the crystal oscillator base (10); The clamping mechanism (3) comprises a first driving component (31), a second driving component (32) and two clamping claws (33), wherein the first driving component (31) is arranged on the base (1), and the second driving component (32) is arranged at the output end of the first driving component (31), the first driving component (31) is used to drive the second driving component (32) to drive the clamping claws (33) to move along a first direction, and the second driving component (32) is used to drive the two clamping claws (33) to approach each other in a second direction so that the two clamping claws (33) jointly clamp the pins (101) on the crystal oscillator base (10), and the first direction is perpendicular to the second direction.

2. The pin correction device according to claim 1, characterized in that: Cam grooves (331) are respectively provided on opposite sides of the two clamping jaws (33). The second driving assembly (32) comprises two follower components (321) respectively matched with the corresponding cam grooves (331). The follower component (321) comprises a connecting block (3211), a rotating shaft (3212) and a follower bearing (3213). The connecting block (3211) is connected to the output end of the first driving assembly (31). The rotating shaft (3212) is vertically arranged on the connecting block (3211). The follower bearing (3213) is rotatably arranged on the rotating shaft (3212). The follower bearing (3213) is located in the cam groove (331) and can match with the side wall of the cam groove (331). The two follower bearings (3213) can simultaneously drive the two clamping jaws (33) to approach each other in the second direction when driving the corresponding clamping jaws (33) to move along the first direction.

3. The pin correction device according to claim 1, characterized in that: The first driving component (31) comprises a driving member (311) and a mounting plate (312); the driving member (311) is arranged on the base (1); the mounting plate (312) is connected to an output shaft of the driving member (311); the second driving component (32) is arranged on the mounting plate (312); and the driving member (311) is capable of driving the mounting plate (312) to move along the first direction.

4. The pin correction device according to claim 3, characterized in that: The output shaft of the driving member (311) is connected to an adapter member (313), the adapter member (313) comprises a large diameter section (3131) and a small diameter section (3132), a step (3133) is formed at the intersection of the large diameter section (3131) and the small diameter section (3132), a connecting groove (3121) is formed on the mounting plate (312), and the connecting groove (3121) sequentially includes a large diameter section (3131) and a small diameter section (3132) from a side close to the driving member (311). The invention comprises a second groove (31212) and a first groove (31211) which are connected to each other, wherein the size of the first groove (31211) in the second direction is larger than the size of the second groove (31212), the large diameter section (3131) is located in the first groove (31211), the small diameter section (3132) is located in the second groove (31212), and the step (3133) can abut against the side wall of the first groove (31211).

5. The pin correction device according to claim 3, characterized in that: The clamping mechanism (3) further comprises a first guide assembly (35), the first guide assembly (35) comprising a first guide rail (351) and a first slider (352), the first guide rail (351) being arranged on the base (1) and extending along the first direction, the first slider (352) being connected to the bottom of the mounting plate (312) and being slidably connected to the first guide rail (351).

6. The pin correction device according to claim 1, characterized in that: An elastic reset member (34) is connected between the two clamping jaws (33).

7. The pin correction device according to claim 1, characterized in that: The two clamping jaws (33) are defined as a first clamping jaw (332) and a second clamping jaw (333), respectively; the end of the first clamping jaw (332) is formed with two first clamping portions (3321) spaced apart along the second direction; the end of the second clamping jaw (333) is formed with two second clamping portions (3331) spaced apart along the second direction; the first clamping portions (3321) and the second clamping portions (3331) are arranged in a one-to-one correspondence; each of the first clamping portions (3321) and the corresponding second clamping portion (3331) are used to clamp one of the pins (101).

8. The pin correction device according to claim 1, characterized in that: The clamping mechanism (3) further comprises a second guide assembly (36), the second guide assembly (36) comprising a second guide rail (361) and a second slider (362), the second guide rail (361) extending along the second direction, the second slider (362) being connected to the bottom of the clamping jaw (33) and being slidably connected to the second guide rail (361).

9. The pin correction device according to claim 8, characterized in that: The clamping mechanism (3) further comprises a third guide assembly (37), the third guide assembly (37) comprising a third guide rail (371), a third slider (372) and a connecting plate (373), the third guide rail (371) being arranged on the base (1) and extending along the first direction, the third slider (372) being connected to the bottom of the connecting plate (373) and being slidably connected to the third guide rail (371), and the second guide rail (361) being connected to the connecting plate (373).

10. The pin correction device according to claim 1, characterized in that: The number of the clamping mechanisms (3) is two, and the two clamping mechanisms (3) are symmetrically arranged along the first direction.