Quick-change positioning pin structure for a machining clamp

Abstract

The utility model relates to mechanical processing fixture technical field, and disclose a kind of quick-change positioning pin structure for mechanical processing fixture, including workbench, the top of workbench is provided with fixture body, the inside of fixture body is provided with quick positioning assembly.The quick-change positioning pin structure for mechanical processing fixture is directly connected with positioning pin through locating guide pillar, without presetting guide column mounting structure inside fixture body, only need to construct locking system by knob driving threaded rod extruding spring when assembling, reverse rotation knob can be unlocked when disassembling, without knocking, prying and other violent operation, effectively reduce operation difficulty, the thrust provided by spring to locating guide pillar is combined continuously, the extrusion force of locating guide pillar to steel ball is stable, steel ball is always embedded in fixture groove, can avoid steel ball from coming out due to vibration and cutting force in processing process, ensure that positioning pin has no axial movement, and workpiece position keeps relatively stable.

Description

Technical Field

[0001] This utility model relates to the field of machining fixture technology, and in particular to a quick-change positioning pin structure for machining fixtures. Background Technology

[0002] As the core foundation of the machinery industry, machinery manufacturing refers to industrial production activities that transform raw materials or semi-finished products into mechanical products and parts with definite shapes, dimensions, precision, and functions through technical means such as machining, forming, assembly, quality inspection, and process planning. In the machinery manufacturing process, the quick-change positioning pin structure of machining fixtures is essentially a special pin-shaped structure that can be quickly disassembled and accurately positioned. During processing, the workpiece is firmly fixed in the correct position by inserting it into the preset positioning hole of the workpiece. It is a key tooling component in machinery manufacturing that improves processing efficiency and ensures positioning accuracy.

[0003] However, the existing quick-change locating pin structure for machining fixtures has the following disadvantages:

[0004] Traditional quick-change positioning pins rely on a structure of a round pin and a diamond pin with bolts for fixing. They lack the initial guiding role of a threaded rod. Because the gap between the round pin and the pin hole is extremely small to ensure precision, workers have to repeatedly adjust the angle of the positioning pin to align with the hole during installation. If there is a slight deviation, it will be difficult to install. Compared with the one-click operation of threaded rod guidance and steel ball locking, the whole process is cumbersome and greatly increases the time cost of fixture changeover, thus seriously affecting the production line changeover efficiency.

[0005] Therefore, this utility model provides a quick-change positioning pin structure for machining fixtures. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] The problem solved by this utility model is to provide a quick-change positioning pin structure for machining fixtures with high practicality, which solves the problem mentioned in the background art of the lack of a threaded rod guide and steel ball locking one-button operation that makes the whole process cumbersome.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: a quick-change positioning pin structure for a machining fixture, comprising a worktable, a fixture body on the top of the worktable, a quick positioning component inside the fixture body, the quick positioning component including multiple limiting grooves on the surface of the fixture body, a positioning pin slidably connected to the inner wall of the limiting groove, the positioning pin being adapted to the limiting groove, a movable groove below the middle of the positioning pin, a connecting post slidably connected to the inner wall of the movable groove, the connecting post being adapted to the movable groove, a threaded rod fixedly connected to the bottom of the connecting post, an insertion hole at the bottom of the positioning pin, a positioning guide post movably penetrating the inner wall of the insertion hole, the positioning guide post being adapted to the insertion hole, a spring connecting the threaded rod and the positioning guide post on opposite sides, multiple limiting holes on the surface of the positioning pin, steel balls movably connected to the inner wall of the limiting holes, the steel balls being adapted to the limiting holes.

[0010] Optionally, a handle is fixedly connected to the top of the connecting column. There are four handles, all located at the four corners of the clamp body. By leveraging the lever principle, the operating force is amplified. Rotating the handle can drive the threaded rod to rotate, which can easily screw in or out the positioning pin, solving the problem that traditional positioning pins require a wrench to tighten bolts, which is laborious.

[0011] Optionally, the surface of the positioning pin is provided with anti-slip texture, which is arranged in a circle to increase the friction between the hand and the positioning pin, making it less likely to slip when rotating the positioning pin and improving the convenience of disassembly and assembly operations.

[0012] Optionally, two threaded holes are provided on both sides of the fixture body, and bolts are threaded to the inner walls of the two threaded holes. The bolts are adapted to the threaded holes, so that the entire fixture body can be fastened to the worktable to prevent the fixture body from shifting during the processing and to ensure the reference stability of the positioning pin.

[0013] Optionally, a threaded groove is provided above the middle end of the positioning pin. The threaded groove is connected to the lower movable groove. The threaded groove is adapted to the threaded rod. The threaded rod is threaded to the inner wall of the threaded groove. When the throttle is rotated, the threaded rod will move spirally along the threaded groove, which not only realizes the axial fixation of the positioning pin, but also replaces the traditional hard insertion method and provides automatic guidance during installation.

[0014] Optionally, the surface of the positioning guide post is provided with rounded corners. The rounded corners of the positioning guide post contact the surface of the steel ball. When the positioning pin is screwed in, the threaded rod pushes the positioning guide post downwards, and the rounded corners squeeze the steel ball outwards, so that the steel ball is embedded in the groove of the clamp body to complete the locking.

[0015] (III) Beneficial Effects

[0016] This utility model provides a quick-change locating pin structure for machining fixtures, which has the following advantages:

[0017] This machining fixture uses a quick-change locating pin structure, which connects directly to the locating pin via a locating guide post. There is no need to pre-install a guide post within the fixture body. During assembly, simply driving the threaded rod with the throttle to compress the spring establishes the locking system. Disassembly unlocks by rotating the throttle in the opposite direction, eliminating the need for forceful operations such as hammering or prying, effectively reducing operational difficulty. Combined with the continuous thrust provided by the spring to the locating guide post, the compressive force of the locating guide post on the steel ball remains stable, ensuring the steel ball is always embedded in the fixture groove. This prevents the steel ball from dislodging due to vibration or cutting forces during machining, ensuring no axial movement of the locating pin and maintaining a relatively stable workpiece position. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the positioning pin body structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the bolt structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the spring structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the steel ball structure of this utility model.

[0022] In the diagram: 1. Workbench; 2. Quick positioning assembly; 201. Fixture body; 202. Positioning pin; 203. Connecting column; 204. Threaded rod; 205. Positioning guide column; 206. Spring; 207. Steel ball; 4. Turn handle; 5. Anti-slip texture; 6. Bolt. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] Please see Figures 1 to 4This utility model provides a technical solution: a quick-change positioning pin structure for a machining fixture, including a worktable 1, a fixture body 201 on the top of the worktable 1, a quick positioning component 2 inside the fixture body 201, the quick positioning component 2 including multiple limiting grooves formed on the surface of the fixture body 201, and positioning pins 202 slidably connected to the inner sidewalls of the limiting grooves. The positioning pins 202 are adapted to the limiting grooves and serve as positioning holes for direct insertion into the workpiece, restricting the movement and rotation of the workpiece along the X / Y / Z axes. The positioning pin 202 has a rotational degree of freedom and is made of 40Cr alloy structural steel, which combines high strength and wear resistance, and is suitable for cutting force impact. A movable groove is opened below the middle of the positioning pin 202. A connecting post 203 is slidably connected to the inner wall of the movable groove. The connecting post 203 is adapted to the movable groove. A threaded rod 204 is fixedly connected to the bottom of the connecting post 203. The threaded rod 204 mates with the threaded groove of the positioning pin 202, realizing the screwing in or out of the positioning pin 202. It is made of 20CrMnTi carburized steel, with excellent thread wear resistance. The thread specification is M8× 1.25. The bottom of the positioning pin 202 has an insertion hole, and a positioning guide post 205 movably passes through the inner wall of the insertion hole. The positioning guide post 205 is adapted to the insertion hole and is inserted into the bottom insertion hole of the positioning pin 202 to achieve initial centering of the positioning pin 202. At the same time, it bears the elastic force of the spring 206 to ensure the reliability of reset. It is made of GCr15 bearing steel with a fillet radius of R2mm. The threaded rod 204 and the positioning guide post 205 are connected by a spring 206 on the opposite side. The spring 206 provides the restoring force. The positioning guide post 205 is reset during disassembly, which drives the steel ball 207 to retract. It is made of 65Mn spring steel with an elastic limit σe≥800MPa. The surface of the positioning pin 202 has multiple limiting holes. The inner sidewall of the limiting hole is movably connected to the steel ball 207. The steel ball 207 is adapted to the limiting hole and is embedded in the groove of the clamp body 201 to achieve axial locking of the positioning pin 202. It uses GCr15 bearing steel ball with a surface roughness Ra≤0.025μm and sphericity error≤0.002mm.

[0025] The top of the connecting column 203 is fixedly connected to a handle 4, which is made of PA66 reinforced nylon with good insulation. There are four handles 4, all of which are located at the four corners of the clamp body 201. The operating force is amplified by lever principle. Rotating the handle 4 can drive the threaded rod 204 to rotate, which can easily screw in or out the positioning pin 202, solving the problem that the traditional positioning pin 202 requires a wrench to tighten the bolt 6, which is laborious.

[0026] The surface of the positioning pin 202 is provided with anti-slip texture 5, which is integrally processed with the positioning pin 202. It is made of 40Cr alloy structural steel with knurling treatment and a knurling depth of 0.2mm. The anti-slip texture 5 is arranged in a circle, which can increase the contact friction between the hand and the positioning pin 202, making it less likely to slip when rotating the positioning pin 202 and improving the convenience of disassembly and assembly operations.

[0027] Two threaded holes are provided on both sides of the fixture body 201. Bolts 6 are threaded to the inner sidewalls of the two threaded holes. The bolts are made of 8.8 grade high strength steel and 45 steel with heat treatment. They are suitable for the fastening requirements of heavy workpiece processing. The bolts 6 are compatible with the threaded holes and can fasten the entire fixture body 201 to the worktable 1 to prevent the fixture body 201 from shifting during processing and to ensure the reference stability of the positioning pin 202.

[0028] The locating pin 202 has a threaded groove above the middle end, which is connected to the lower movable groove. The threaded groove is adapted to the threaded rod 204, which is threaded to the inner wall of the threaded groove. When the throttle 4 is rotated, the threaded rod 204 will move spirally along the threaded groove, which not only achieves the axial fixation of the locating pin 202, but also replaces the traditional hard insertion method and provides automatic guidance during installation.

[0029] The surface of the positioning guide post 205 is rounded. The rounded corner of the positioning guide post 205 contacts the surface of the steel ball 207. When the positioning pin 202 is screwed in, the threaded rod 204 pushes the positioning guide post 205 down, and the rounded corner will squeeze the steel ball 207 outward, so that the steel ball 207 is embedded in the groove of the clamp body 201 to complete the locking.

[0030] In this invention, the working steps of the device are as follows:

[0031] Steps: First, the operator holds the positioning pin 202 and inserts the positioning guide post 205 into the insertion hole at the bottom of the positioning pin 202, so that the positioning guide post 205 and the positioning pin 202 form a sliding connection. Next, the operator rotates the handle 4 to drive the threaded rod 204 to gradually screw into the threaded groove. As the threaded rod 204 screws in, its bottom will contact the top of the spring 206. Continue rotating the handle 4 so that the threaded rod 204 will compress the spring 206, putting the spring 206 in a pre-compressed state. At the same time, the spring 206 pushes the positioning guide post. 205 moves downward along the insertion hole of the positioning pin 202. When the rounded corner of the positioning guide post 205 contacts the steel ball 207 in the limiting hole, as the positioning guide post 205 continues to move downward, the rounded corner exerts an outward squeezing force on the steel ball 207, causing the steel ball 207 to pop out from the limiting hole and thus embed into the corresponding groove of the limiting groove of the fixture body 201. When the steel ball 207 is completely embedded in the groove, the positioning pin 202 is axially locked and cannot be pulled out from the limiting groove or moved up and down. At this point, the installation of the positioning pin 202 is completed.

[0032] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above utility model, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming.

[0033] All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.

[0034] It will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick-change locating pin structure for a machining fixture, comprising a worktable (1), characterized in that: The workbench (1) is provided with a clamp body (201) on its top. The clamp body (201) is provided with a quick positioning component (2) inside. The quick positioning component (2) includes a plurality of limiting grooves formed on the surface of the clamp body (201). The inner sidewall of the limiting groove is slidably connected to a positioning pin (202). The positioning pin (202) is adapted to the limiting groove. The positioning pin (202) is provided with a movable groove below its middle end. The inner sidewall of the movable groove is slidably connected to a connecting post (203). The connecting post (203) is adapted to the movable groove. The bottom of the connecting column (203) is fixedly connected to a threaded rod (204). The bottom of the positioning pin (202) is provided with an insertion hole. The inner side wall of the insertion hole is movably connected to a positioning guide post (205). The positioning guide post (205) is adapted to the insertion hole. The threaded rod (204) and the positioning guide post (205) are connected together by a spring (206) on opposite sides. The surface of the positioning pin (202) is provided with multiple limiting holes. The inner side wall of the limiting hole is movably connected to a steel ball (207). The steel ball (207) is adapted to the limiting hole.

2. The quick-change locating pin structure for a machining fixture according to claim 1, characterized in that: The top of the connecting column (203) is fixedly connected to a throttle (4), and there are four throttles (4) which are all located at the four corners of the clamp body (201).

3. The quick-change locating pin structure for a machining fixture according to claim 1, characterized in that: The surface of the positioning pin (202) is provided with anti-slip texture (5), which is arranged in a circular pattern.

4. The quick-change locating pin structure for a machining fixture according to claim 1, characterized in that: The fixture body (201) has two threaded holes on both sides, and the inner walls of the two threaded holes are threaded with bolts (6), which are adapted to the threaded holes.

5. The quick-change locating pin structure for a machining fixture according to claim 1, characterized in that: The locating pin (202) has a threaded groove above the middle end, the threaded groove is connected to the lower movable groove, the threaded groove is adapted to the threaded rod (204), and the threaded rod (204) is threaded to the inner wall of the threaded groove.

6. The quick-change locating pin structure for a machining fixture according to claim 1, characterized in that: The surface of the positioning guide post (205) is provided with rounded corners, and the rounded corners of the positioning guide post (205) contact the surface of the steel ball (207).

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