Spring pin structure

Abstract

The utility model discloses a spring pin structure, which comprises a pin seat, a positioning pin and a spring, the positioning pin comprises a positioning head part and a guide rod part, the pin seat comprises a guide seat and a positioning base, and a mounting hole is arranged in the pin seat, and is characterized in that the outer diameter of the guide rod part is smaller than that of the positioning head part, and the mounting hole comprises a guide mounting section and a limit mounting section. The inner diameter of the guiding installation section is smaller than that of the limiting installation section, the guiding installation section is arranged in the guiding seat, a limiting baffle ring is detachably arranged at the bottom of the guiding rod part and can be arranged in the limiting installation section in a vertically movable mode, the outer diameter of the limiting baffle ring is larger than the inner diameter of the guiding installation section, and the spring is vertically arranged in the limiting installation section. The upper end of the spring abuts against the bottom of the limiting baffle ring. The utility model has the advantages of simple structure and good generality, and can effectively avoid interference with the product to ensure the positioning accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of machining positioning, in particular to a spring pin structure. Background Technique

[0002] The spring pin generally includes a pin seat, a positioning pin and a spring. The positioning pin includes a positioning head, a guiding and installing section and a limiting section which are integrally manufactured from top to bottom in sequence. The outer diameter of the guiding and installing section is usually equal from top to bottom, and its outer diameter is equal to the bottom outer diameter of the positioning head (for the convenience of installing the positioning pin from the bottom of the pin seat from bottom to top). The pin seat includes a guiding seat and a positioning base which are arranged in sequence from top to bottom. An installation hole which penetrates up and down is arranged in the pin seat. The installation hole includes an upper installation section and a lower installation section which are arranged in sequence from top to bottom. The upper installation section is arranged in the guiding seat. The inner diameter of the upper installation section is matched with the outer diameter of the guiding and installing section. The outer diameter of the limiting section is larger than the inner diameter of the upper installation section. The outer diameter of the lower installation section is matched with the outer diameter of the limiting section. The positioning pin is installed from bottom to top, so that the positioning head extends upward and is arranged outside the pin seat. The limiting section is arranged in the lower installation section in a vertically movable manner. The spring is arranged below the limiting section and is located in the lower installation section. In machining, the positioning holes of some products are relatively large, but the space for positioning and installing the spring pin is relatively limited. Then, for the spring pin with the above conventional structure, for the positioning hole with a large diameter, it is necessary to use a positioning head with a large outer diameter. The large outer diameter of the positioning head leads to the corresponding increase in the outer diameter of the guiding and installing section. Then, in order to cooperate with the vertical movable installation of the guiding and installing section with a large outer diameter, the inner diameter of the upper installation section also increases, and further the outer dimension of the guiding seat needs to increase. This forms a conflict with the limited space on the product for positioning and installing the spring pin, resulting in that the above traditional spring pin structure cannot be adapted to the positioning use of the product with a large positioning hole and a small installation space, causing interference between the spring pin and the product, and further affecting the positioning accuracy of the product. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a spring pin structure with simple structure, good versatility, which can effectively avoid interference with the product to ensure the positioning accuracy.

[0004] The technical scheme adopted by the utility model to solve the above technical problem is as follows:

[0005] A spring pin structure comprises a pin seat, a positioning pin and a spring, the positioning pin comprising a positioning head and a guide rod portion coaxially arranged in sequence from top to bottom, the pin seat comprising a guide seat and a positioning base arranged in sequence from top to bottom, a mounting hole penetrating up and down is arranged in the pin seat, the outer diameter of the guide rod portion is smaller than the outer diameter of the positioning head portion, the mounting hole comprises a guide mounting section and a limiting mounting section for limiting which are coaxially arranged in sequence from top to bottom and cooperate with the guide rod portion, the inner diameter of the guide mounting section is smaller than the inner diameter of the limiting mounting section, the guide mounting section is arranged in the guide seat, a limiting retaining ring is detachably provided at the bottom of the guide rod portion, the limiting retaining ring can be movably arranged in the limiting mounting section up and down, the outer diameter of the limiting retaining ring is larger than the inner diameter of the guide mounting section, the spring is vertically arranged in the limiting mounting section, and the upper end of the spring is abutted against the bottom of the limiting retaining ring.

[0006] The bottom center of the guide rod is provided with an internal thread connection hole, and the center of the limit stop ring is provided with a connection through hole that passes through from top to bottom. The rod of a matching screw passes through the connection through hole and is screwed into the internal thread connection hole to realize the detachable fixed connection between the limit stop ring and the bottom of the guide rod, and the head of the screw is arranged in the spring. The structure for realizing the detachable fixed connection between the limit stop ring and the guide rod is simple, the connection is stable, the disassembly and assembly are convenient, and the cost is low.

[0007] The positioning head includes a positioning part and a supporting part. The positioning part is a truncated cone with a gradually increasing outer diameter from top to bottom. The supporting part is a cylindrical body. The outer diameter of the supporting part is equal to the maximum outer diameter of the positioning part. The guide seat is provided with a recessed part coaxial with the mounting hole and matched with the supporting part. The supporting part can be movably arranged in the recessed part. After the product is positioned by the spring pin, the supporting part is embedded in the recessed part and cooperates with the recessed part to provide a stable positioning force for the positioning head and realize stable positioning support.

[0008] The support part and the guide rod part are connected via a coaxial receiving section, the outer diameter of the receiving section is smaller than the outer diameter of the guide rod part, and an annular depression is formed between the support part and the guide rod part, which is used to achieve accurate positioning accuracy between the positioning pin and the pin seat, making the positioning more reliable.

[0009] The side chips of the guide seat are provided with avoidance recesses. If permitted, the installation space required for the guide seat can be further reduced, thereby better avoiding interference with the product.

[0010] The described positioning base is provided with a positioning and installation hole that penetrates up and down, which is used to realize the installation of the spring pin on the tooling base plate.

[0011] Compared with the prior art, the advantages of the present utility model are as follows: the structure is simple, the spring pin is designed into a stepped structure. For products with different positioning hole diameters, the outer diameter of the guide rod part can remain unchanged, and only the size of the positioning head needs to be changed. Then, since the outer diameter of the guide rod part remains unchanged, the size of the guide seat can be kept unchanged, thereby avoiding the problem that the interference between the guide seat and the product due to the over-large size of the guide seat affects the positioning accuracy. It can be widely used for most machining positioning; the limiting snap ring for limiting and the guide rod part of the positioning pin are detachably connected, so that the stepped positioning pin can be inserted into the pin seat from top to bottom, and then the limiting snap ring is installed at the bottom to achieve limiting installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is the overall three-dimensional structure schematic diagram of the present utility model;

[0013] Figure 2 is the sectional structure schematic diagram of the present utility model;

[0014] Figure 3 is the exploded structure schematic diagram of the present utility model;

[0015] Figure 4 is the three-dimensional structure schematic diagram of the positioning pin in the present utility model;

[0016] Figure 5 is the sectional structure schematic diagram of the pin seat in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present utility model will be further described in detail below in conjunction with the embodiments of the drawings.

[0018] As shown in the figure, a spring pin structure includes a pin seat 1, a positioning pin 2 and a spring 3. The positioning pin 2 includes a positioning head 21 and a guide rod 22 which are coaxially arranged from top to bottom. The pin seat 1 includes a guide seat 11 and a positioning base 12 which are arranged from top to bottom. A mounting hole 13 which passes through the pin seat 1 is provided. The outer diameter of the guide rod 22 is smaller than the outer diameter of the positioning head 21. The mounting hole 13 includes a guide mounting section 131 and a guide mounting section 132 which are coaxially arranged from top to bottom and match the guide rod 22. The limiting installation section 132 is used for limiting, the inner diameter of the guide installation section 131 is smaller than the inner diameter of the limiting installation section 132, the guide installation section 131 is arranged in the guide seat 11, and a limiting retaining ring 4 is detachably arranged at the bottom of the guide rod portion 22, and the limiting retaining ring 4 can be movably arranged in the limiting installation section 132 up and down, the outer diameter of the limiting retaining ring 4 is larger than the inner diameter of the guide installation section 131, the spring 3 is vertically arranged in the limiting installation section 132, and the upper end of the spring 3 is against the bottom of the limiting retaining ring 4.

[0019] In this specific embodiment, the bottom center of the guide rod 22 is provided with an internal thread connection hole 221, and the center of the limit stop ring 4 is provided with a connection through hole 41 that passes through from top to bottom. The rod of the matching screw 20 passes through the connection through hole 41 and is screwed into the internal thread connection hole 221 to realize the detachable fixed connection between the limit stop ring 4 and the bottom of the guide rod 22, and the head of the screw 20 is arranged in the spring 3. The structure for realizing the detachable fixed connection between the limit stop ring 4 and the guide rod 22 is simple, the connection is stable, the disassembly and assembly are convenient, and the cost is low.

[0020] In this specific embodiment, the positioning head 21 includes a positioning part 211 and a supporting part 212. The positioning part 211 is a truncated cone with a gradually increasing outer diameter from top to bottom. The supporting part 212 is a cylinder. The outer diameter of the supporting part 212 is equal to the maximum outer diameter of the positioning part 211. The guide seat 11 is provided with a recessed part 111 which is coaxial with the mounting hole 13 and matches with the supporting part 212. The supporting part 212 can be movably arranged in the recessed part 111 up and down. After the product is positioned by this spring 3 pin, the supporting part 212 is embedded in the recessed part 111 and cooperates with the recessed part 111 to provide a stable positioning force to the positioning head 21 and realize a stable positioning support.

[0021] In this specific embodiment, the support portion 212 and the guide rod portion 22 are connected by a coaxial receiving section 23, the outer diameter of the receiving section 23 is smaller than the outer diameter of the guide rod portion 22, and an annular recess 24 is formed between the support portion 212 and the guide rod portion 22. It is used to achieve accurate positioning accuracy between the positioning pin and the pin seat, making the positioning more reliable.

[0022] In this specific embodiment, an avoidance recess 110 is provided on the side chip of the guide seat 11. If permitted, the required installation space for the guide seat 11 can be further reduced, thus better avoiding interference with the product.

[0023] In this specific embodiment, a positioning and installation hole 14 that penetrates up and down is provided on the positioning base 12. It is used to realize the installation of the spring 3 pin on the tooling base plate.

[0024] During assembly, the positioning pin 2 is inserted from top to bottom for installation. After the screw 20 passes through the limit retaining ring 4, the screw 20 and the limit retaining ring 4 are installed into the limit installation section 132 from bottom to top with a screwdriver and screwed into the internally threaded connection hole 221 correspondingly provided on the guide rod portion 22. Finally, the spring 3 is installed into the limit installation section 132.

Claims

1. A spring pin structure, comprising a pin seat, a positioning pin and a spring, wherein the positioning pin comprises a positioning head and a guide rod portion coaxially arranged in sequence from top to bottom, the pin seat comprises a guide seat and a positioning base arranged in sequence from top to bottom, and a mounting hole penetrating from top to bottom is provided in the pin seat, characterized in that: The outer diameter of the guide rod portion is smaller than the outer diameter of the positioning head portion, the mounting hole comprises a guide mounting section and a limit mounting section for limiting the position, which are coaxially arranged in sequence from top to bottom and cooperate with the guide rod portion, the inner diameter of the guide mounting section is smaller than the inner diameter of the limit mounting section, the guide mounting section is arranged in the guide seat, a limit stop ring is detachably arranged at the bottom of the guide rod portion, the limit stop ring can be movably arranged up and down in the limit mounting section, the outer diameter of the limit stop ring is larger than the inner diameter of the guide mounting section, the spring is vertically arranged in the limit mounting section, and the upper end of the spring is abutted against the bottom of the limit stop ring.

2. A spring pin structure according to claim 1, characterized in that: An internal threaded connecting hole is arranged at the bottom center of the guide rod portion, and a connecting through hole which passes through from top to bottom is arranged at the center of the limit stop ring. The limit stop ring is detachably fixedly connected to the bottom of the guide rod portion by passing the rod portion of a matching screw through the connecting through hole and being screwed into the internal threaded connecting hole. The head of the screw is arranged in the spring.

3. A spring pin structure according to claim 1, characterized in that: The positioning head includes a positioning part and a supporting part. The positioning part is a truncated cone with an outer diameter gradually increasing from top to bottom. The supporting part is a cylinder. The outer diameter of the supporting part is equal to the maximum outer diameter of the positioning part. The guide seat is recessed with a recessed part that is coaxial with the mounting hole and cooperates with the supporting part. The supporting part can be movably arranged up and down in the recessed part.

4. A spring pin structure according to claim 3, characterized in that: The support portion and the guide rod portion are connected via a coaxial receiving section, the outer diameter of the receiving section is smaller than the outer diameter of the guide rod portion, and an annular recess is formed between the support portion and the guide rod portion.

5. A spring pin structure according to claim 1, characterized in that: The side chip avoidance recess of the guide seat is provided.

6. A spring pin structure according to claim 1, characterized in that: The positioning base is provided with a positioning installation hole which passes through from top to bottom.

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