A quick-change positioning pin structure

Abstract

The utility model discloses a quick-change locating pin structure, comprising a fixture base plate, a cylindrical locating pin and a diamond locating pin; the cylindrical locating pin and the diamond locating pin are detachably connected to the upper end surface of the fixture base plate; the long axis of the diamond locating pin is perpendicular to the line connecting the center points of the diamond locating pin and the cylindrical locating pin; the utility model can realize the rapid installation of two pins on one side, and the positioning accuracy of the locating pin body after installation is high, which fully meets the processing and use requirements. After the trial production of the workpiece is completed, the two locating pin bodies can be easily taken out, and the locating pin installation holes on the locating pin body and the fixture base plate are intact and undamaged, the locating pin body can be reused, and the fixture base plate can also be modified for the processing of other workpieces, and the reuse rate of the fixture base plate is improved; when trial-producing other workpieces, it is only necessary to select the locating pin body of the corresponding size according to the size of the process locating hole, without the need for re-production, thereby reducing the processing cost and improving the processing efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing fixtures, in particular to a quick-change positioning pin structure. Background Art

[0002] The positioning method of the prior art workpiece trial production is the "one side two pins" positioning method, that is, a fixture base plate with a positioning hole and two positioning pins, one of which is a cylindrical positioning pin and the other is a diamond positioning pin, which are used in pairs. The two positioning pins have an interference fit with the fixture base plate, and the positioning pins are hammered into the positioning holes of the fixture base plate with a copper hammer. During the installation of the positioning pins, very high assembly technology requirements are placed on the installers to ensure that the positioning accuracy of the positioning pins after installation meets the processing requirements; and after the trial production of the workpiece is completed, it is very difficult to remove the positioning pins. During the removal process, the positioning parts of the positioning pins inserted into the workpiece positioning part and the positioning parts of the base plate as well as the positioning holes on the fixture base plate will be damaged, and the two positioning pins cannot be used again. The possibility and number of times of modification and reuse of the fixture base plate are greatly reduced. Other workpieces need to re-make positioning pins during trial production, resulting in a waste of resources, increased processing costs, and reduced processing efficiency. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a quick-change positioning pin structure, which is easy to install, has no special requirements on the assembly technology of the installer, is convenient to disassemble without damage, has high positioning accuracy and can be used repeatedly.

[0004] The utility model provides a quick-change positioning pin structure, comprising a fixture bottom plate, a cylindrical positioning pin and a diamond positioning pin;

[0005] The cylindrical positioning pin and the diamond positioning pin are detachably connected to the upper end surface of the fixture bottom plate;

[0006] The long axis of the rhombus locating pin is perpendicular to the line connecting the center points of the rhombus locating pin and the cylindrical locating pin.

[0007] A pair of sunken circular grooves with the same structure are respectively provided on the upper end surface of the clamp bottom plate. Each sunken circular groove is a two-stage step structure, including an upper pin handle accommodating circular groove and a lower pin rod accommodating circular groove connected to its lower end. The diameter of the pin handle accommodating circular groove is larger than the diameter of the pin rod accommodating circular groove; the cylindrical locating pin and the diamond locating pin are respectively detachable and matched to be accommodated in a pair of sunken circular grooves, and the upper ends of the cylindrical locating pin and the diamond locating pin are exposed outside the upper end surface of the clamp bottom plate.

[0008] The inner wall of the pin rod accommodating groove is provided with an internal thread, and the cylindrical locating pin includes a cylindrical pin cap, a cylindrical pin handle and a cylindrical pin rod; the outer wall of the cylindrical pin rod is provided with an external thread, and the cylindrical pin rod can be screwed and fixed with the corresponding pin rod accommodating groove; the rhombus locating pin includes a rhombus pin cap, a rhombus pin handle and a rhombus pin rod; the rhombus pin handle and the rhombus pin rod have the same structure as the cylindrical pin handle and the cylindrical pin rod respectively, and the rhombus pin rod can be screwed and fixed with the corresponding pin rod accommodating groove; by clamping the outer wall of the cylindrical pin cap or the outer wall of the rhombus pin cap with a wrench or pliers and rotating it forward or backward, the cylindrical locating pin and the rhombus locating pin can be fixed / removed on the bottom plate of the fixture, so that the cylindrical locating pin and the rhombus locating pin can be used repeatedly, saving trial production and processing costs.

[0009] The upper end faces of the cylindrical pin cap and the upper end faces of the diamond pin cap are respectively provided with hexagonal grooves. The cylindrical locating pin and the diamond locating pin can be fixed / removed on the fixture bottom plate by inserting an hexagonal wrench into the hexagonal grooves on the upper ends of the cylindrical pin cap and the diamond pin cap. By rotating forward or backward, the cylindrical locating pin and the diamond locating pin can be fixed / removed on the fixture bottom plate, so that the cylindrical locating pin and the diamond locating pin can be repeatedly used, saving trial production and processing costs.

[0010] The cylindrical pin rod and the diamond pin rod are respectively matched with the pin rod accommodating circular groove with clearance, and the matching clearance is less than 0.01mm.

[0011] A regular hexagonal convex ring is respectively provided on the lower part of the circumferential outer wall of the cylindrical pin cap and the lower part of the circumferential outer wall of the diamond pin cap. The regular hexagonal convex ring can be engaged with an ordinary wrench or pliers, and the cylindrical locating pin and the diamond locating pin can be fixed / removed on the fixture bottom plate by rotating forward or backward, thereby realizing the repeated use of the cylindrical locating pin and the diamond locating pin, saving the trial production cost.

[0012] The rhombus pin rod has the same structure as the cylindrical pin rod. The upper end faces of the cylindrical pin cap and the rhombus pin cap are respectively provided with grooves with internal threads. By screwing the bolt into the groove with internal threads and pulling the bolt with pliers, the embedded cylindrical positioning pin or rhombus positioning pin can be pulled out from the pin rod accommodating circular groove. The cylindrical pin rod is a columnar body as a whole. The lower end face of the columnar body is provided with a pin rod inner groove upward. A limit clamp ring is protruded from the circumferential outer wall of the lower end of the columnar body. The circumferential side walls of the inner groove of the pin rod are Three slits are evenly arranged, and the circumferential side walls of the groove in the pin rod, the three slits and the limiting clamping ring together constitute the three limiting tongues of the cylindrical pin rod, and the three limiting tongues are matched and accommodated in the pin rod accommodating circular groove and are in close contact with the pin rod accommodating circular groove; so that when the cylindrical pin rod or the diamond pin rod is accommodated in the pin rod accommodating circular groove, the three limiting tongues can be deformed inwardly due to the flexibility of the plastic material and inserted into the pin rod accommodating circular groove, and are in close contact with the pin rod accommodating circular groove.

[0013] An inner concave annular groove is provided on the outer side wall of the cylindrical pin rod corresponding to the upper end of the inner groove of the pin rod, so that the three limiting tongues can be better flexibly deformed, making it convenient for the cylindrical pin rod or diamond-shaped pin rod to be inserted into or pulled out of the pin rod accommodating circular groove.

[0014] A limiting ring groove is provided on the inner wall of the pin rod accommodating circular groove corresponding to the position of the limiting snap ring. The limiting snap ring can be limitedly contacted in the limiting ring groove of the accommodating circular groove. This structure makes the cylindrical locating pin and the diamond locating pin firmly connected to the fixture base plate and will not easily loosen. Only when a large upward pulling force is applied to the pin caps at the upper ends of the cylindrical locating pins and the diamond locating pins can the cylindrical locating pins and the diamond locating pins be freed from the constraints of the fixture base plate.

[0015] Beneficial Effects

[0016] After using the utility model, the rapid installation of two pins on one side can be realized, and there is no special requirement for the operator's assembly technology. In addition, the positioning accuracy of the locating pin body after installation is high, which fully meets the processing and use requirements. After the trial production of the workpiece is completed, the two locating pin bodies can be easily taken out, and the locating pin installation holes on the locating pin body and the fixture bottom plate are intact and undamaged. The locating pin body can be reused, and the fixture bottom plate can also be modified for the processing of other workpieces, thereby improving the reuse rate of the fixture bottom plate. When trial-producing other workpieces, it is only necessary to select the locating pin body of the corresponding size according to the size of the process locating hole, without the need for re-production, thereby reducing the processing cost and improving the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the combined cross-sectional structure of the first embodiment of the utility model.

[0018] Figure 2 It is a schematic diagram of the exploded structure of the second embodiment of the utility model.

[0019] Figure 3 This is a schematic diagram of the combined cross-sectional structure of the third embodiment of the utility model.

[0020] Figure 4 A schematic diagram of the cross-sectional structure of a clamp bottom plate in a third embodiment of the present invention.

[0021] Figure 5 A schematic diagram of the three-dimensional structure of a cylindrical positioning pin according to a fourth embodiment of the present invention.

[0022] Figure 6 A schematic cross-sectional structure diagram of a cylindrical positioning pin according to a fourth embodiment of the present invention.

[0023] Figure 7 A schematic diagram of the three-dimensional structure of a diamond-shaped positioning pin in a fourth embodiment of the present utility model.

[0024] Figure 8 A schematic cross-sectional structure diagram of a diamond-shaped positioning pin according to a fourth embodiment of the present invention.

[0025] In the figure:

[0026] 1. Clamp bottom plate; 11. Sinking circular groove; 111. Pin handle accommodating circular groove; 112. Pin rod accommodating circular groove; 1121. accommodating circular groove limiting ring groove;

[0027] 2. Cylindrical locating pin; 21. Cylindrical pin cap; 22. Cylindrical pin handle; 23. Cylindrical pin rod;

[0028] 3. Diamond-shaped positioning pin; 31. Diamond-shaped pin cap; 32. Diamond-shaped pin handle; 33. Diamond-shaped pin rod;

[0029] 4. Inner groove of the pin rod; 41. Position limiting clamp ring; 42. Slit; 43. Inner concave ring groove. DETAILED DESCRIPTION

[0030] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example 1

[0034] See also Figure 1 As shown, a quick-change positioning pin structure includes a fixture base plate 1, a cylindrical positioning pin 2 and a diamond-shaped positioning pin 3;

[0035] The cylindrical positioning pin 2 and the diamond positioning pin 3 are detachably connected to the upper end surface of the fixture bottom plate 1;

[0036] The long axis of the rhombus locating pin 3 is perpendicular to the line connecting the center points of the rhombus locating pin 3 and the cylindrical locating pin 2 .

[0037] A pair of sunken circular grooves 11 with the same structure are respectively provided on the upper end surface of the clamp base plate 1. Each sunken circular groove 11 is a two-stage step structure, including an upper pin handle accommodating circular groove 111 and a lower pin rod accommodating circular groove 112 connected to its lower end. The diameter of the pin handle accommodating circular groove 111 is larger than the diameter of the pin rod accommodating circular groove 112; the cylindrical locating pin 2 and the diamond locating pin 3 are respectively detachably matched and accommodated in a pair of sunken circular grooves 11, and the upper ends of the cylindrical locating pin 2 and the diamond locating pin 3 are exposed outside the upper end surface of the clamp base plate 1.

[0038] The inner wall of the pin rod accommodating groove 112 is provided with an internal thread, and the cylindrical locating pin 2 includes a cylindrical pin cap 21, a cylindrical pin handle 22 and a cylindrical pin rod 23; the outer wall of the cylindrical pin rod 23 is provided with an external thread, and the cylindrical pin rod 23 can be screwed and fixed with the corresponding pin rod accommodating groove 112; the rhombus locating pin 3 includes a rhombus pin cap 31, a rhombus pin handle 32 and a rhombus pin rod 33; the rhombus pin handle 32 and the rhombus pin rod 33 have the same structure as the cylindrical pin handle 22 and the cylindrical pin rod 23, respectively, and the rhombus pin rod 33 can be screwed and fixed with the corresponding pin rod accommodating groove 112; the upper end surface of the cylindrical pin cap 21 and the upper end surface of the rhombus pin cap 31 are respectively provided with an inner hexagonal groove.

[0039] The cylindrical pin 23 and the rhombus pin 33 are respectively matched with the pin accommodating circular groove 112 with a clearance of 0.005 mm.

[0040] Example 2

[0041] See also Figure 2 As shown, a quick-change positioning pin structure includes a fixture base plate 1, a cylindrical positioning pin 2 and a diamond-shaped positioning pin 3;

[0042] The cylindrical positioning pin 2 and the diamond positioning pin 3 are detachably connected to the upper end surface of the fixture bottom plate 1;

[0043] The long axis of the rhombus locating pin 3 is perpendicular to the line connecting the center points of the rhombus locating pin 3 and the cylindrical locating pin 2 .

[0044] A pair of sunken circular grooves 11 with the same structure are respectively provided on the upper end surface of the clamp base plate 1. Each sunken circular groove 11 is a two-stage step structure, including an upper pin handle accommodating circular groove 111 and a lower pin rod accommodating circular groove 112 connected to its lower end. The diameter of the pin handle accommodating circular groove 111 is larger than the diameter of the pin rod accommodating circular groove 112; the cylindrical locating pin 2 and the diamond locating pin 3 are respectively detachably matched and accommodated in a pair of sunken circular grooves 11, and the upper ends of the cylindrical locating pin 2 and the diamond locating pin 3 are exposed outside the upper end surface of the clamp base plate 1.

[0045] The inner wall of the pin rod accommodating groove 112 is provided with an internal thread, and the cylindrical locating pin 2 includes a cylindrical pin cap 21, a cylindrical pin handle 22 and a cylindrical pin rod 23; the outer wall of the cylindrical pin rod 23 is provided with an external thread, and the cylindrical pin rod 23 can be screwed and fixed with the corresponding pin rod accommodating groove 112; the rhombus locating pin 3 includes a rhombus pin cap 31, a rhombus pin handle 32 and a rhombus pin rod 33; the rhombus pin handle 32 and the rhombus pin rod 33 have the same structure as the cylindrical pin handle 22 and the cylindrical pin rod 23 respectively, and the rhombus pin rod 33 can be screwed and fixed with the corresponding pin rod accommodating groove 112.

[0046] The cylindrical pin 23 and the rhombus pin 33 are respectively matched with the pin accommodating circular groove 112 with a clearance of 0.003 mm.

[0047] A regular hexagonal convex ring is respectively provided at the lower part of the circumferential outer side wall of the cylindrical pin cap 21 and the lower part of the circumferential outer side wall of the rhombus pin cap 31 .

[0048] Example 3

[0049] See also Figure 3-Figure 4 As shown, a quick-change positioning pin structure includes a fixture base plate 1, a cylindrical positioning pin 2 and a diamond-shaped positioning pin 3;

[0050] The cylindrical positioning pin 2 and the diamond positioning pin 3 are detachably connected to the upper end surface of the fixture bottom plate 1;

[0051] The long axis of the rhombus locating pin 3 is perpendicular to the line connecting the center points of the rhombus locating pin 3 and the cylindrical locating pin 2 .

[0052] A pair of sunken circular grooves 11 with the same structure are respectively provided on the upper end surface of the clamp base plate 1. Each sunken circular groove 11 is a two-stage step structure, including an upper pin handle accommodating circular groove 111 and a lower pin rod accommodating circular groove 112 connected to its lower end. The diameter of the pin handle accommodating circular groove 111 is larger than the diameter of the pin rod accommodating circular groove 112; the cylindrical locating pin 2 and the diamond locating pin 3 are respectively detachably matched and accommodated in a pair of sunken circular grooves 11, and the upper ends of the cylindrical locating pin 2 and the diamond locating pin 3 are exposed outside the upper end surface of the clamp base plate 1.

[0053] The cylindrical locating pin 2 includes a cylindrical pin cap 21, a cylindrical pin handle 22 and a cylindrical pin rod 23; the rhombus locating pin 3 includes a rhombus pin cap 31, a rhombus pin handle 32 and a rhombus pin rod 33; the rhombus pin rod 33 has the same structure as the cylindrical pin rod 23, the cylindrical pin rod 23 is a columnar body as a whole, the lower end surface of the columnar body is provided with a pin rod inner groove 4 upward, the circumferential outer wall of the lower end of the columnar body is protrudingly provided with a limiting snap ring 41, the circumferential side wall of the pin rod inner groove 4 is evenly provided with three slits 42, the circumferential side wall of the pin rod inner groove 4, the three slits 42 and the limiting snap ring 41 together constitute the three limiting tongues of the cylindrical pin rod 23, the three limiting tongues are matched and accommodated in the pin rod accommodating circular groove 112 and are in close contact with the pin rod accommodating circular groove 112.

[0054] Example 4

[0055] See also Figure 4-Figure 8 As shown, a quick-change positioning pin structure includes a fixture base plate 1, a cylindrical positioning pin 2 and a diamond-shaped positioning pin 3;

[0056] The cylindrical positioning pin 2 and the diamond positioning pin 3 are detachably connected to the upper end surface of the fixture bottom plate 1;

[0057] The long axis of the rhombus locating pin 3 is perpendicular to the line connecting the center points of the rhombus locating pin 3 and the cylindrical locating pin 2 .

[0058] A pair of sunken circular grooves 11 with the same structure are respectively provided on the upper end surface of the clamp base plate 1. Each sunken circular groove 11 is a two-stage step structure, including an upper pin handle accommodating circular groove 111 and a lower pin rod accommodating circular groove 112 connected to its lower end. The diameter of the pin handle accommodating circular groove 111 is larger than the diameter of the pin rod accommodating circular groove 112; the cylindrical locating pin 2 and the diamond locating pin 3 are respectively detachably matched and accommodated in a pair of sunken circular grooves 11, and the upper ends of the cylindrical locating pin 2 and the diamond locating pin 3 are exposed outside the upper end surface of the clamp base plate 1.

[0059] The cylindrical locating pin 2 includes a cylindrical pin cap 21, a cylindrical pin handle 22 and a cylindrical pin rod 23; the diamond locating pin 3 includes a diamond pin cap 31, a diamond pin handle 32 and a diamond pin rod 33; the upper end surfaces of the cylindrical pin cap 21 and the upper end surfaces of the diamond pin cap 31 are respectively provided with grooves with internal threads; the diamond pin rod 33 has the same structure as the cylindrical pin rod 23, the cylindrical pin rod 23 is a columnar body as a whole, the lower end surface of the columnar body is upwardly provided with a pin rod inner groove 4, the circumferential outer wall of the lower end of the columnar body is protruding with a limiting snap ring 41, the circumferential side wall of the pin rod inner groove 4 is evenly provided with three slits 42, the circumferential side wall of the pin rod inner groove 4, the three slits 42 and the limiting snap ring 41 together constitute the three limiting tongues of the cylindrical pin rod 23, the three limiting tongues are matched and accommodated in the pin rod accommodating circular groove 112 and are in close contact with the pin rod accommodating circular groove 112.

[0060] An inner concave annular groove 43 is provided on the outer side wall of the cylindrical pin rod 23 at a position corresponding to the upper end of the inner groove 4 of the pin rod.

[0061] An accommodating circular groove limiting ring groove 1121 is provided at the inner side wall of the pin rod accommodating circular groove 112 corresponding to the position of the limiting snap ring 41 , and the limiting snap ring 41 can be limitedly contacted in the accommodating circular groove limiting ring groove 1121 .

[0062] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A quick-change positioning pin structure, characterized in that: It comprises a fixture base plate (1), a cylindrical positioning pin (2) and a diamond-shaped positioning pin (3); The cylindrical positioning pin (2) and the diamond positioning pin (3) are detachably connected to the upper end surface of the fixture bottom plate (1); The long axis of the rhombus locating pin (3) is perpendicular to the line connecting the center points of the rhombus locating pin (3) and the cylindrical locating pin (2).

2. A quick-change positioning pin structure according to claim 1, characterized in that: A pair of sunken circular grooves (11) of identical structure are respectively provided on the upper end surface of the clamp bottom plate (1), and each sunken circular groove (11) is a two-stage step structure, comprising an upper pin handle accommodating circular groove (111) and a lower pin rod accommodating circular groove (112) connected to the lower end thereof, and the diameter of the pin handle accommodating circular groove (111) is larger than the diameter of the pin rod accommodating circular groove (112); the cylindrical positioning pin (2) and the diamond positioning pin (3) are respectively detachably matched and accommodated in the pair of sunken circular grooves (11), and the upper ends of the cylindrical positioning pin (2) and the diamond positioning pin (3) are both exposed outside the upper end surface of the clamp bottom plate (1).

3. A quick-change positioning pin structure according to claim 2, characterized in that: The inner side wall of the pin rod accommodating circular groove (112) is provided with an internal thread, and the cylindrical positioning pin (2) comprises a cylindrical pin cap (21), a cylindrical pin handle (22) and a cylindrical pin rod (23); the outer side wall of the cylindrical pin rod (23) is provided with an external thread, and the cylindrical pin rod (23) can be screwed and fixed with the corresponding pin rod accommodating circular groove (112); the rhombus positioning pin (3) comprises a rhombus pin cap (31), a rhombus pin handle (32) and a rhombus pin rod (33); the rhombus pin handle (32) and the rhombus pin rod (33) have the same structure as the cylindrical pin handle (22) and the cylindrical pin rod (23), respectively, and the rhombus pin rod (33) can be screwed and fixed with the corresponding pin rod accommodating circular groove (112).

4. A quick-change positioning pin structure according to claim 3, characterized in that: The upper end surface of the cylindrical pin cap (21) and the upper end surface of the rhombus pin cap (31) are respectively provided with hexagonal grooves.

5. A quick-change positioning pin structure according to claim 4, characterized in that: The cylindrical pin rod (23) and the rhombus pin rod (33) are respectively clearance-matched with the pin rod accommodating circular groove (112), and the clearance is less than 0.01 mm.

6. A quick-change positioning pin structure according to claim 5, characterized in that: A regular hexagonal convex ring is respectively provided at the lower part of the circumferential outer side wall of the cylindrical pin cap (21) and the lower part of the circumferential outer side wall of the rhombus pin cap (31).

7. The quick-change positioning pin structure according to claim 3, characterized in that: The rhombus pin rod (33) has the same structure as the cylindrical pin rod (23). The upper end surfaces of the cylindrical pin cap (21) and the rhombus pin cap (31) are respectively provided with grooves with internal threads. The cylindrical pin rod (23) is a columnar body as a whole. The lower end surface of the columnar body is provided with a pin rod inner groove (4) facing upward. A limiting snap ring (41) is protrudingly provided on the circumferential outer wall of the lower end of the columnar body. Three slits (42) are evenly provided on the circumferential side wall of the pin rod inner groove (4). The circumferential side wall of the pin rod inner groove (4), the three slits (42) and the limiting snap ring (41) together constitute three limiting tongues of the cylindrical pin rod (23). The three limiting tongues are matched and accommodated in the pin rod accommodating circular groove (112) and are in close contact with the pin rod accommodating circular groove (112).

8. The quick-change positioning pin structure according to claim 7, characterized in that: An inner concave annular groove (43) is provided on the outer side wall of the cylindrical pin rod (23) at a position corresponding to the upper end of the inner groove (4) of the pin rod.

9. The quick-change positioning pin structure according to claim 8, characterized in that: An accommodating circular groove limiting ring groove (1121) is provided on the inner side wall of the pin rod accommodating circular groove (112) at a position corresponding to the limiting snap ring (41), and the limiting snap ring (41) can be contacted in the accommodating circular groove limiting ring groove (1121).

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