A clamping tool for a pin shaft

By designing a clamping fixture for the pin shaft, a clamping channel is formed by the semi-circular grooves on the upper and lower clamping plates, and a locking block is used for fixation. This solves the problem of low efficiency in traditional pin shaft processing and enables simultaneous clamping and efficient processing of multiple pin shafts.

CN224373424UActive Publication Date: 2026-06-19PANZHIHUA PANMEI MINING MACHINERY MFG

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
PANZHIHUA PANMEI MINING MACHINERY MFG
Filing Date
2025-06-10
Publication Date
2026-06-19

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Abstract

This utility model relates to the field of pin machining technology, and particularly to a pin clamping fixture. A positioning rod is arranged parallel to one side of the worktable, and the positioning rod is arranged longitudinally along the worktable. The upper clamping member includes an upper clamping plate, and the lower clamping member includes a lower clamping plate. The upper and lower clamping plates are arranged opposite to each other and are slidably mounted on the positioning rod. The upper clamping plate has an upper semi-circular groove on the side near the lower clamping plate, and the upper semi-circular grooves are spaced apart along the length direction of the upper clamping plate. The lower clamping plate has a lower semi-circular groove on the side near the upper clamping plate, and the lower semi-circular grooves are spaced apart along the length direction of the lower clamping plate. The upper and lower semi-circular grooves form a clamping channel. A first locking block and a second locking block are slidably mounted on the positioning rod, and the first locking block abuts against the upper clamping plate, and the second locking block abuts against the lower clamping plate. The first and second locking blocks are detachably connected to the worktable. By forming multiple clamping channels on the upper and lower clamping plates, multiple pins can be clamped simultaneously.
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Description

Technical Field

[0001] This utility model relates to the field of pin processing technology, and in particular to a pin clamping fixture. Background Technology

[0002] A pin is a standardized fastener mainly used at the hinge joint of two parts to form a hinge connection. It can achieve a static fixed connection or allow the connected parts to move relative to each other. It is widely used in machinery manufacturing, automobile manufacturing, aerospace, shipbuilding, furniture and other fields to connect and fix components, transmit force and bear loads.

[0003] The original design purpose of machine tool pin fixtures is to improve the efficiency and accuracy of machine tool processing of pin-type parts. In the traditional pin processing process, due to the lack of suitable fixtures, operators need to manually adjust and clamp individual pins, which is inefficient and makes it difficult to clamp multiple pins at the same time. Utility Model Content

[0004] The purpose of this invention is to address the problem that in the traditional pin machining process, due to the lack of suitable tooling, operators need to manually adjust and clamp individual pins, which is inefficient and makes it difficult to clamp multiple pins simultaneously. This invention provides a pin clamping tooling.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A clamping fixture for a pin includes a worktable, an upper clamping member, a lower clamping member, a positioning rod, a first locking block, and a second locking block. The positioning rod is arranged parallel to one side of the worktable and is arranged longitudinally along the worktable.

[0007] The upper clamping member includes an upper clamping plate, and the lower clamping member includes a lower clamping plate. The upper clamping plate and the lower clamping plate are arranged opposite to each other, and the upper clamping plate and the lower clamping plate are slidably mounted on the positioning rod.

[0008] The upper clamping plate has an upper semi-circular groove on the side near the lower clamping plate, and the upper semi-circular groove is spaced apart along the length direction of the upper clamping plate. The lower clamping plate has a lower semi-circular groove on the side near the upper clamping plate, and the lower semi-circular groove is spaced apart along the length direction of the lower clamping plate. The upper semi-circular groove and the lower semi-circular groove form a clamping channel.

[0009] The first locking block and the second locking block are slidably mounted on the positioning rod, and the first locking block abuts against the side of the upper clamping plate away from the lower clamping plate, and the second locking block abuts against the side of the lower clamping plate away from the upper clamping plate. The first locking block and the second locking block are detachably connected to the worktable.

[0010] Preferably, the upper clamping plate has a first connecting portion at both ends, and the lower clamping plate has a second connecting portion at both ends, and the first connecting portion and the second connecting portion are connected by bolts.

[0011] Preferably, the upper clamping plate has a first channel at its end and the lower clamping plate has a second channel at its end. The first channel and the second channel are coaxial with the positioning rod, and the positioning rod passes through the first channel and the second channel.

[0012] Preferably, the upper clamping plate has a first locking block on the side away from the lower clamping plate, and the first locking block has a first locking groove on the side near the upper clamping plate, and the first locking block cooperates with the first locking groove;

[0013] The lower clamping plate has a second locking block on the side away from the upper clamping plate, and the second locking block has a second locking groove on the side near the lower clamping plate, and the second locking block cooperates with the second locking groove.

[0014] Preferably, the first locking block has a first bending plate at both ends, and the first bending plate is detachably connected to the workbench;

[0015] The second locking block has a second bent plate at both ends, and the second bent plate is detachably connected to the worktable.

[0016] Preferably, the workbench includes a panel and a mounting plate, the mounting plate being vertically connected to the side of the panel away from the positioning rod;

[0017] The panel is provided with a strip groove, and the first bent plate and the second bent plate are connected to the strip groove.

[0018] Preferably, the panel has a hollow groove area in the middle, and the strip groove is disposed on both longitudinal sides of the hollow groove area.

[0019] Preferably, the first locking block has a third channel at its end, and the second locking block has a fourth channel at its end. The third channel and the fourth channel are coaxial with the positioning rod, and the positioning rod passes through the third channel and the fourth channel.

[0020] Preferably, the worktable is provided with support seats at both ends in the longitudinal direction, and the positioning rod is installed on the support seats.

[0021] Preferably, the number of positioning rods is two;

[0022] The positioning rods are provided at both ends of the upper clamping plate and the lower clamping plate.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0024] This application discloses a clamping fixture for a pin, comprising an upper clamping plate and a lower clamping plate arranged opposite to each other, the upper and lower clamping plates being slidably mounted on a positioning rod. The upper clamping plate has an upper semi-circular groove on the side near the lower clamping plate, and the lower clamping plate has a lower semi-circular groove on the side near the upper clamping plate. The upper and lower semi-circular grooves form clamping channels to clamp the pin. Since the upper semi-circular grooves are spaced apart along the length of the upper clamping plate, and the lower semi-circular grooves are spaced apart along the length of the lower clamping plate, multiple clamping channels are formed on the upper and lower clamping plates, thereby simultaneously clamping multiple pins; furthermore, a first lock... The first locking block and the second locking block are slidably mounted on the positioning rod. The first locking block abuts against the side of the upper clamping plate away from the lower clamping plate, and the second locking block abuts against the side of the lower clamping plate away from the upper clamping plate. By detachably connecting the first locking block and the second locking block to the worktable, the first locking block and the second locking block are fixed to the worktable, restricting the sliding of the first locking block and the second locking block on the positioning rod. This, in turn, fixes the upper clamping plate and the lower clamping plate to a specified position on the positioning rod. Attached Figure Description

[0025] Figure 1 This is a top view of this application.

[0026] Figure 2 yes Figure 1 Sectional view at point AA.

[0027] Figure 3 This is a top view of the upper clamping component.

[0028] Figure 4 This is a front view of the upper clamping component.

[0029] Figure 5 This is a top view of the lower clamping component.

[0030] Figure 6 This is a top view of the first locking block.

[0031] Figure 7 This is a front view of the first locking block.

[0032] Figure 8 This is a top view of the second locking block.

[0033] Figure 9 This is a schematic diagram showing the connection between the first locking block and the worktable.

[0034] Marked in the image:

[0035] 1-Workbench, 11-Panel, 111-Empty Slot Area, 112-Strip Slot, 12-Mounting Plate, 2-Upper Clamping Component, 20-Upper Clamping Plate, 21-Upper Semicircular Slot, 22-First Connecting Part, 23-First Channel, 24-First Locking Block, 3-Lower Clamping Component, 30-Lower Clamping Plate, 31-Lower Semicircular Slot, 32-Second Connecting Part, 33-Second Channel, 34-Second Locking Block, 4-Positioning Rod, 5-Support Base, 6-First Locking Block, 61-First Slot, 62-Third Channel, 63-First Bending Plate, 7-Second Locking Block, 71-Second Slot, 72-Fourth Channel, 73-Second Bending Plate, 8-Locking Bolt, 9-Positioning Bolt, 100-Threaded Surface. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0037] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0038] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0039] Furthermore, the use of terms such as "first," "second," "third," etc. in terminology is merely for distinguishing identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0040] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0041] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0042] Example 1

[0043] like Figures 1-9 As shown, this embodiment discloses a clamping fixture for a pin, including a worktable 1, an upper clamping member 2, a lower clamping member 3, a positioning rod 4, a first locking block 6, and a second locking block 7. The positioning rod 4 is arranged parallel to one side of the worktable 1 and is arranged longitudinally along the worktable 1.

[0044] The upper clamping member 2 includes an upper clamping plate 20, and the lower clamping member 3 includes a lower clamping plate 30. The upper clamping plate 20 and the lower clamping plate 30 are arranged opposite to each other, and the upper clamping plate 20 and the lower clamping plate 30 are slidably mounted on the positioning rod 4.

[0045] The upper clamping plate 20 is provided with an upper semi-circular groove 21 on the side near the lower clamping plate 30. The upper semi-circular groove 21 is spaced apart along the length of the upper clamping plate 20. The lower clamping plate 30 is provided with a lower semi-circular groove 31 on the side near the upper clamping plate 20. The lower semi-circular groove 31 is spaced apart along the length of the lower clamping plate 30. The upper semi-circular groove 21 and the lower semi-circular groove 31 form a clamping channel.

[0046] The first locking block 6 and the second locking block 7 are slidably mounted on the positioning rod 4. The first locking block 6 abuts against the side of the upper clamping plate 20 away from the lower clamping plate 30, and the second locking block 7 abuts against the side of the lower clamping plate 30 away from the upper clamping plate 20. The first locking block 6 and the second locking block 7 are detachably connected to the worktable 1.

[0047] In this embodiment, the upper clamping plate 20 and the lower clamping plate 30 are arranged opposite to each other and are slidably mounted on the positioning rod 4. The upper clamping plate 20 has an upper semi-circular groove 21 on the side near the lower clamping plate 30, and the lower clamping plate 30 has a lower semi-circular groove 31 on the side near the upper clamping plate 20. The upper semi-circular groove 21 and the lower semi-circular groove 31 form a clamping channel to clamp the pin. Since the upper semi-circular groove 21 is spaced apart along the length direction of the upper clamping plate 20, and the lower semi-circular groove 31 is spaced apart along the length direction of the lower clamping plate 30, multiple clamping channels are formed on the upper clamping plate 20 and the lower clamping plate 30, thereby clamping multiple pins simultaneously. Further, the first locking block 6 and The second locking block 7 is slidably mounted on the positioning rod 4, and the first locking block 6 abuts against the side of the upper clamping plate 20 away from the lower clamping plate 30, and the second locking block 7 abuts against the side of the lower clamping plate 30 away from the upper clamping plate 20. By detachably connecting the first locking block 6 and the second locking block 7 to the worktable 1, the first locking block 6 and the second locking block 7 are fixed to the worktable 1, restricting the sliding of the first locking block 6 and the second locking block 7 on the positioning rod 4, thereby fixing the upper clamping plate 20 and the lower clamping plate 30 to a specified position on the positioning rod 4.

[0048] A preferred method, such as Figures 3-5 As shown, the upper clamping plate 20 has a first connecting part 22 at both ends, and the lower clamping plate 30 has a second connecting part 32 at both ends. The first connecting part 22 and the second connecting part 32 are connected by bolts.

[0049] The upper clamping plate 20 and the lower clamping plate 30 are connected together by bolts so that the upper clamping plate 20 and the lower clamping plate 30 can clamp the pin.

[0050] Furthermore, both the first connecting part 22 and the second connecting part 32 are provided with bolt holes, and the first connecting part 22 and the second connecting part 32 are fastened together by locking bolts 8, such as... Figure 1 .

[0051] In this embodiment, multiple pins are first installed on the upper clamping plate 20 and the lower clamping plate 30. Then, the upper clamping plate 20 and the lower clamping plate 30 are connected together by locking bolts 8. Then, the upper clamping plate 20 and the lower clamping plate 30 are moved, that is, the upper clamping plate 20 and the lower clamping plate 30 are moved on the positioning rod 4. After the upper clamping plate 20 and the lower clamping plate 30 are moved to the designated position, the upper clamping plate 20 and the lower clamping plate 30 are fixed at the designated position on the positioning rod 4 by the first locking block 6 and the second locking block 7.

[0052] A preferred method, such as Figure 4 As shown, the inner wall of the upper semicircular groove 21 has a threaded surface 100 to enhance the friction between the upper semicircular groove 21 and the pin, so as to clamp the pin.

[0053] A preferred method, such as Figures 3-5 As shown, the upper clamping plate 20 has a first channel 23 at its end, and the lower clamping plate 30 has a second channel 33 at its end. The first channel 23 and the second channel 33 are coaxial with the positioning rod 4, and the positioning rod 4 passes through the first channel 23 and the second channel 33.

[0054] By providing a first channel 2 at the end of the upper clamping plate 20 and a second channel 33 at the end of the lower clamping plate 30, the positioning rod 4 passes through the first channel 23 and the second channel 33, thereby allowing the upper clamping plate 20 and the lower clamping plate 30 to be slidably mounted on the positioning rod 4.

[0055] Furthermore, the positioning rod 4 is a smooth round rod, and the diameter of the first channel 23 and the second channel 33 is larger than the diameter of the positioning rod 4.

[0056] A preferred method, such as Figures 6-7 As shown, the first locking block 6 has a first bending plate 63 at both ends, and the first bending plate 63 is detachably connected to the worktable 1;

[0057] The second locking block 7 has a second bending plate 73 at both ends, and the second bending plate 73 is detachably connected to the worktable 1.

[0058] By setting first bending plates 63 at both ends of the first locking block 6, the first bending plates 63 are detachably connected to the workbench 1, thereby achieving temporary fixation between the first bending plates 63 and the workbench 1.

[0059] By setting second bending plates 73 at both ends of the second locking block 7, the second bending plates 73 are detachably connected to the worktable 1, thereby achieving temporary fixation between the second bending plates 73 and the worktable 1.

[0060] A preferred method, such as Figure 2 As shown, the workbench 1 includes a panel 11 and a mounting plate 12, with the mounting plate 12 vertically connected to the side of the panel 11 away from the positioning rod 4;

[0061] The panel 11 is provided with a strip groove 112, and the first bending plate 63 and the second bending plate 73 are connected to the strip groove 112.

[0062] Specifically, such as Figure 1 , Figure 9 As shown, the first bent plate 63 has a fixing hole at one end near the strip groove 112, and the first bent plate 63 is fixed to the strip groove 112 by the positioning bolt 9.

[0063] The second bent plate 73 is also provided with a fixing hole at one end near the strip groove 112. The second bent plate 73 is fixed to the strip groove 112 by the positioning bolt 9.

[0064] Furthermore, the workbench 1 includes a panel 11 and a mounting plate 12. The mounting plate 12 is vertically connected to the side of the panel 11 away from the positioning rod 4. By vertically providing the mounting plate 12 on the panel 11, the mounting plate 12 is used to connect to other equipment or machine tools, thereby mounting the pin clamping fixture of this embodiment on other equipment or machine tools.

[0065] A preferred method, such as Figure 1 As shown, the panel 11 has a hollow groove area 111 in the middle, and the strip groove 112 is arranged on both sides of the hollow groove area 111 longitudinally.

[0066] By setting a hollow groove area 111 in the middle of the panel 11, not only can the overall weight of the panel 11 be reduced, but it can also facilitate the installation of the pin and avoid interference between the pin and the panel 11 during installation.

[0067] Furthermore, the width of the empty slot area 111 is greater than the length of the upper clamping plate 20 and the lower clamping plate 30.

[0068] A preferred method, such as Figures 6-8 As shown, the first locking block 6 has a third channel 62 at its end, and the second locking block 7 has a fourth channel 72 at its end. The third channel 62 and the fourth channel 72 are coaxial with the positioning rod 4, and the positioning rod 4 passes through the third channel 62 and the fourth channel 72.

[0069] By providing a third channel 62 at the end of the first locking block 6 and a fourth channel 72 at the end of the second locking block 7, the positioning rod 4 passes through the third channel 62 and the fourth channel 72, thereby allowing the upper clamping plate 20 and the lower clamping plate 30 to be slidably mounted on the positioning rod 4.

[0070] Furthermore, the diameters of the third channel 62 and the fourth channel 72 are larger than the diameter of the positioning rod 4.

[0071] A preferred method, such as Figure 1 , Figure 2 As shown, the workbench 1 has support seats 5 at both ends in the longitudinal direction, and the positioning rod 4 is installed on the support seats 5.

[0072] Specifically, there are two sets of support seats 5, each set including two support seats 5, and the two support seats 5 are respectively installed at both ends of the longitudinal direction of the workbench 1, and a positioning rod 4 is fixed on the two support seats 5.

[0073] A preferred method, such as Figure 1 As shown, there are two positioning rods 4;

[0074] Positioning rods 4 are provided at both ends of the upper clamping plate 20 and the lower clamping plate 30.

[0075] Example 2

[0076] like Figures 3-8 As shown, based on embodiment 1, the upper clamping plate 20 is provided with a first locking block 24 on the side away from the lower clamping plate 30, and the first locking block 6 is provided with a first locking groove 61 on the side close to the upper clamping plate 20. The first locking block 24 cooperates with the first locking groove 61.

[0077] The lower clamping plate 30 is provided with a second locking block 34 on the side away from the upper clamping plate 20, and the second locking block 7 is provided with a second locking groove 71 on the side near the lower clamping plate 30. The second locking block 34 cooperates with the second locking groove 71.

[0078] like Figure 1 , Figure 2 As shown, by engaging the first locking block 24 of the upper clamping plate 20 with the first locking slot 61 of the first locking block 6, the upper clamping plate 20 and the first locking block 6 are more firmly abutted together;

[0079] Specifically, the size of the first card block 24 is adapted to the size of the first card slot 61, and part of the first card block 24 is embedded in the first card slot 61;

[0080] By engaging the second locking block 34 of the lower clamping plate 30 with the second locking slot 71 of the second locking block 7, the lower clamping plate 30 and the second locking block 7 are more firmly abutted together;

[0081] Specifically, the size of the second card block 34 is adapted to the size of the second card slot 71, and part of the second card block 34 is embedded in the second card slot 71.

[0082] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A clamping fixture for a pin, characterized in that, It includes a worktable (1), an upper clamping member (2), a lower clamping member (3), a positioning rod (4), a first locking block (6), and a second locking block (7). The positioning rod (4) is arranged parallel to one side of the worktable (1) and is arranged longitudinally along the worktable (1). The upper clamping member (2) includes an upper clamping plate (20), and the lower clamping member (3) includes a lower clamping plate (30). The upper clamping plate (20) and the lower clamping plate (30) are arranged opposite to each other, and the upper clamping plate (20) and the lower clamping plate (30) are slidably mounted on the positioning rod (4). The upper clamping plate (20) has an upper semi-circular groove (21) on the side near the lower clamping plate (30), and the upper semi-circular groove (21) is spaced apart along the length direction of the upper clamping plate (20). The lower clamping plate (30) has a lower semi-circular groove (31) on the side near the upper clamping plate (20), and the lower semi-circular groove (31) is spaced apart along the length direction of the lower clamping plate (30). The upper semi-circular groove (21) and the lower semi-circular groove (31) form a clamping channel. The first locking block (6) and the second locking block (7) are slidably mounted on the positioning rod (4), and the first locking block (6) abuts against the side of the upper clamping plate (20) away from the lower clamping plate (30), and the second locking block (7) abuts against the side of the lower clamping plate (30) away from the upper clamping plate (20). The first locking block (6) and the second locking block (7) are detachably connected to the workbench (1).

2. The clamping fixture for a pin according to claim 1, characterized in that, The upper clamping plate (20) has a first connecting part (22) at both ends, and the lower clamping plate (30) has a second connecting part (32) at both ends. The first connecting part (22) and the second connecting part (32) are connected by bolts.

3. The clamping fixture for a pin according to claim 2, characterized in that, The upper clamping plate (20) is provided with a first channel (23) at its end, and the lower clamping plate (30) is provided with a second channel (33) at its end. The first channel (23) and the second channel (33) are coaxial with the positioning rod (4), and the positioning rod (4) passes through the first channel (23) and the second channel (33).

4. The clamping fixture for a pin according to claim 3, characterized in that, The upper clamping plate (20) is provided with a first locking block (24) on the side away from the lower clamping plate (30), and the first locking block (6) is provided with a first locking groove (61) on the side close to the upper clamping plate (20). The first locking block (24) cooperates with the first locking groove (61). The lower clamping plate (30) has a second locking block (34) on the side away from the upper clamping plate (20), and the second locking block (7) has a second locking groove (71) on the side close to the lower clamping plate (30). The second locking block (34) cooperates with the second locking groove (71).

5. The clamping fixture for a pin according to claim 3, characterized in that, The first locking block (6) has a first bending plate (63) at both ends, and the first bending plate (63) is detachably connected to the workbench (1); The second locking block (7) has a second bending plate (73) at both ends, and the second bending plate (73) is detachably connected to the workbench (1).

6. The clamping fixture for a pin according to claim 5, characterized in that, The workbench (1) includes a panel (11) and a mounting plate (12), the mounting plate (12) being vertically connected to the side of the panel (11) away from the positioning rod (4); The panel (11) is provided with a strip groove (112), and the first bent plate (63) and the second bent plate (73) are connected to the strip groove (112).

7. The clamping fixture for a pin according to claim 6, characterized in that, The panel (11) has a hollow groove area (111) in the middle, and the strip groove (112) is arranged on both sides of the hollow groove area (111) longitudinally.

8. The clamping fixture for a pin according to claim 4, characterized in that, The first locking block (6) has a third channel (62) at its end, and the second locking block (7) has a fourth channel (72) at its end. The third channel (62) and the fourth channel (72) are coaxial with the positioning rod (4), and the positioning rod (4) passes through the third channel (62) and the fourth channel (72).

9. The clamping fixture for a pin according to claim 1, characterized in that, The workbench (1) has support seats (5) at both longitudinal ends, and the positioning rod (4) is installed on the support seats (5).

10. The clamping fixture for a pin according to claim 1, characterized in that, The number of positioning rods (4) is two; The upper clamping plate (20) and the lower clamping plate (30) are both provided with positioning rods (4).