Positioning pin

Abstract

The positioning pin comprises an outer pin body, an inner pin body, expansion blocks and a pressing rod, the outer pin body is cylindrical, the inner pin body is coaxially inserted into the upper end of the outer pin body in a matched mode, a through opening is horizontally formed in the side wall of the inner pin body, a pair of expansion blocks is movably embedded in the through opening, a center joint is formed between the expansion blocks, and the pressing rod is arranged in the center joint. A hole connected into the through opening is formed in the upper end of the inner pin body, a pressing rod is inserted into the hole, the lower end of the pressing rod is connected into the center seam and abuts against the expansion block, and the pressing rod, the expansion block and the outer pin body are in interference fit with one another. By means of the mode, the locating pin achieves free stretching and retracting through a split structure of the inner pin body and the outer pin body, achieves the interference fit locking effect through expansion of the pressing rod on the expansion block, has good compatibility and is convenient to install and maintain.

Description

TECHNICAL FIELD

[0001] The utility model relates to tooling parts field especially relates to a positioning pin. BACKGROUND

[0002] Positioning pin is usually applied on tooling, it plays the effect of limiting automatic movement degree of object through the cooperation with pin hole. The length of the existing step positioning pin cannot be adjusted, if the length of the positioning pin is not suitable during the equipment debugging stage, the whole positioning pin needs to be replaced or the part needs to be redesigned, which not only wastes time, but also may cause the production schedule delay. In addition, the existing structure relies on the cooperation of the pin hole and the positioning pin which are processed with certain accuracy to ensure the reliability of the positioning accuracy. However, the processing accuracy of one pin hole and one positioning pin is low in replaceability, and when the processing accuracy cannot be reached, the positioning accuracy cannot be guaranteed. SUMMARY

[0003] The utility model mainly solves the technical problem to provide a kind of positioning pin, and the expansion of the expansion block is realized by the telescopic structure of inner and outer pin body, and the locking effect of interference fit is realized by the expansion of the expansion block by pressure rod, with better compatibility, and it is convenient to install and maintain.

[0004] To solve the above technical problems, one technical scheme of the utility model is provided: provide a kind of positioning pin, including outer pin body, inner pin body, expansion block, pressure rod, the outer pin body is cylindrical and is coaxially inserted and is connected with inner pin body in upper end, the lateral wall of the inner pin body is horizontally provided with through hole, a pair of expansion blocks are movably embedded in the through hole, the expansion block is formed between the expansion block, the upper end of the inner pin body is provided with the hole of access through hole, the pressure rod is inserted in the hole, the lower end of the pressure rod accesses the gap and is in contact with the expansion block, the pressure rod, expansion block and outer pin body are mutually interference fit.

[0005] In a preferred embodiment of the utility model, the shape of the hole is an internal thread step hole with three-step structure, the internal thread step hole is composed of upper thread part, middle sunk head part and lower sunk hole part, and the pressure rod is a sunk head pin structure and occupies the middle sunk head part and the lower sunk hole part.

[0006] In a preferred embodiment of the utility model, the lower end of the pressure rod and the upper part of the expansion block are provided with mutually matched inclined surfaces, and the inclined surfaces are equal in depth.

[0007] In a preferred embodiment of the utility model, the through hole and the expansion block are both T-shaped and seamlessly fit each other.

[0008] In a preferred embodiment of the utility model, a plurality of small springs are arranged between the expansion blocks, and the small springs connect the expansion blocks.

[0009] In a preferred embodiment of the present application, a large spring is arranged in the middle section countersunk head, and the large spring is sleeved on the pressing rod.

[0010] In a preferred embodiment of the present application, an adjusting top pin is threadedly connected to the upper section threaded part, and the adjusting top pin is press-connected to the top end of the pressing rod.

[0011] In a preferred embodiment of the present application, an inner thread is arranged on the lower end port of the outer pin body, and a bottom cover is threadedly installed on the inner thread, and the bottom cover completely covers the lower end surface of the outer pin body.

[0012] In a preferred embodiment of the present application, a bottom spring is arranged between the bottom cover and the inner pin body, and the bottom spring is in a compressed state.

[0013] In a preferred embodiment of the present application, a slide guide groove parallel to the central axis is formed on the inner wall of the outer pin body, and an integrally formed guide block is protrusively arranged on the outer wall of the inner pin body, and the guide block is movably fitted in the slide guide groove; a plurality of apertures are formed along the line on the slide guide groove, and the apertures are used for clamping the guide block.

[0014] The present application has the advantages that the positioning pin provided by the present application realizes free expansion through the split structure of the inner and outer pin bodies, and the expansion of the expansion block by the pressing rod realizes the interference fit locking effect, has good compatibility, and is convenient to install and maintain. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor, and the drawings are as follows:

[0016] Figure 1 is a whole structure diagram of a preferred embodiment of the positioning pin of the present application;

[0017] Figure 2 is an internal structure diagram of the inner pin body of a preferred embodiment of the positioning pin of the present application;

[0018] Figure 3 is a perspective view of the outer pin body of a preferred embodiment of the positioning pin of the present application;

[0019] Figure 4 is a sectional view of the inner pin body of a preferred embodiment of the positioning pin of the present application. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figures 1-4 As shown, the embodiments of this utility model include:

[0022] A positioning pin includes an outer pin body 1, an inner pin body 2, a tightening block 3, and a pressure rod 4. The outer pin body 1 is cylindrical and the inner pin body 2 is coaxially inserted into its upper end. The inner pin body 2 has a horizontal through-hole 5 on its side wall. A pair of tightening blocks 3 are movably embedded in the through-hole 5, and a central slit 6 is formed between the tightening blocks 3. The upper end of the inner pin body 2 has a hole 7 for connecting to the through-hole 5. The pressure rod 4 is inserted into the hole 7. The lower end of the pressure rod 4 connects to the central slit 6 and abuts against the tightening blocks 3. The pressure rod 4, the tightening blocks 3, and the outer pin body 1 are interference-fitted with each other.

[0023] The hole 7 is a three-stage internal thread stepped hole 7, which consists of an upper threaded section, a middle countersunk head section, and a lower countersunk hole section. The pressure rod 4 is a countersunk pin structure and occupies the middle countersunk head section and the lower countersunk hole section.

[0024] Furthermore, the lower end of the pressure rod 4 and the upper part of the expansion block 3 are both provided with mutually cooperating inclined surfaces, and the inclined surfaces are of equal depth.

[0025] Furthermore, both the through-hole 5 and the expansion block 3 are T-shaped and fit together seamlessly.

[0026] Furthermore, several small springs 8 are provided between the tensioning blocks 3, and the small springs 8 connect the tensioning blocks 3 together.

[0027] Furthermore, a large spring 9 is provided inside the middle section sinker head, and the large spring 9 is sleeved on the pressure rod 4.

[0028] Furthermore, the upper threaded section is threadedly connected to an adjusting screw 10, which is pressed against the top of the pressure rod 4.

[0029] Furthermore, the lower end of the outer pin 1 is provided with an internal thread and a bottom cover 11 is threadedly installed thereon, the bottom cover 11 completely covering the lower end face of the outer pin 1.

[0030] Furthermore, a bottom spring 12 is provided between the bottom cover 11 and the inner pin 2, and the bottom spring 12 is in a compressed state.

[0031] Further, the inner wall of the outer pin body 1 is provided with a sliding guide groove 13 parallel to the central axis, the outer wall of the inner pin body 2 is provided with an integrally formed guide block 14, and the guide block 14 is movably fitted in the sliding guide groove 13; the sliding guide groove 13 is provided with a plurality of openings 15 along the line, and the openings 15 are used for clamping the guide block 14.

[0032] The product has the following feature points: the bottom spring 12 is connected with the inner pin body 2 and the bottom cover 11 at both ends, the inner pin body 2 is sleeved into the outer pin body 1, and the bottom cover 11 is connected to the bottom of the outer pin body 1; the inner pin body 2 is installed in the sliding channel of the outer pin body 1, and the bottom cover 11 is at the bottom of the outer pin body 1.

[0033] In the above manner, the product realizes the length-adjustable function, the inner pin body 2 is elongated / shortened through the inner sliding channel of the outer pin body 1, that is, the two-stage length adjustment of the stepped positioning pin is realized. The product not only has high adaptability, but also can reduce the disassembly and assembly time when the equipment design is wrong or needs to be improved, and has a more convenient maintenance method.

[0034] The core structure of the product is a simple expansion type positioning structure, which is mainly realized by the inner pin body 2, the expansion blocks 3, the small spring 8, the large spring 9, the pressure rod 4 and the adjusting top screw 10. The small spring 8 connects the two expansion blocks 3, the pressure rod 4 presses down the large spring 9 and is in sliding fit with the expansion blocks 3; the adjusting top screw 10 is connected with the pressure rod 4; the expansion blocks 3, the pressure rod 4 and the adjusting top screw 10 are all in the corresponding holes 7 of the inner pin body 2. The simple expansion type positioning structure can make the pressure rod 4 press down the expansion blocks 3 to realize the corresponding locking function. That is, the pressure rod 4 realizes the expansion positioning.

[0035] The mechanism not only ensures the concentricity, but also uses the expansion mechanism to realize the purpose of filling the small gap between the hole 7 and the pin. It can adapt to different machining precision pin holes 7, and the expansion mechanism can be easily disassembled by relaxing the expansion force, and still maintains good performance when reinstalled, which is convenient for maintenance and repair, and prolongs the service life of the parts.

[0036] The product has simple structure and convenient installation. The assembly process is as follows: connect the bottom spring 12 with the inner pin body 2 and the bottom cover 11, sleeve into the outer pin body 1, press the bottom cover 11 into the outer pin body 1, insert the small spring 8 and the two expansion blocks 3 into the inner pin body 2 after welding, press the pressure rod 4 into the inner pin body 2 after passing through the large spring 9, and screw the adjusting top screw 10 into the threaded hole 7 at the top of the inner pin body 2, that is, the assembly process is completed.

[0037] In use, the assembled positioning pin outer pin body 1 part is loaded into the large pin hole 7 in a conventional manner, then the positioning pin is loaded into the part to be positioned, and the expansion positioning is achieved by tightening the top adjusting top pin 10, if thicker parts need to be loaded, the inner pin body 2 is lengthened and rotated to be clamped into the corresponding clamping groove, so that the length of the positioning pin can be adjusted, and thicker parts can be loaded.

[0038] In summary, the utility model provides a kind of positioning pin, and the free telescopic effect is realized by inner and outer pin body 1 split structure, and the expansion of expansion block 3 is realized by pressure rod 4, and the locking effect of interference fit is realized, with better compatibility, and it is convenient to install and maintain.

[0039] The above is only the embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process transformation using the content of the utility model specification, or direct or indirect application in other related technical fields, are also included in the patent protection range of the utility model.

Claims

1. A positioning pin, characterized in that, Including outer pin, inner pin, expansion block, pressure rod, the outer pin is cylindrical and coaxially inserts and matches with inner pin at the upper end, the side wall of the inner pin is horizontally provided with a through hole, a pair of expansion blocks are movably embedded in the through hole, a gap is formed between the expansion blocks, a hole is provided in the upper end of the inner pin and connected with the through hole, a pressure rod is inserted in the hole, the lower end of the pressure rod is connected with the gap and abuts against the expansion block, the pressure rod, the expansion block and the outer pin are mutually interference fitted.

2. The positioning pin of claim 1, wherein The shape of the hole is an internal thread step hole with three step structures, the internal thread step hole is composed of an upper thread part, a middle sunk head part and a lower sunk hole part, the pressure rod is a sunk head pin structure and occupies the middle sunk head part and the lower sunk hole part.

3. The positioning pin of claim 1, wherein, The lower end of the pressure rod and the upper part of the expansion block are provided with mutually matched inclined surfaces, and the inclined surfaces have the same depth.

4. The positioning pin of claim 1, wherein, The through hole and the expansion block are T-shaped and seamlessly and anastomosically matched.

5. The positioning pin of claim 1, wherein, A plurality of small springs are arranged between the expansion blocks, and the small springs connect the expansion blocks.

6. The positioning pin of claim 2, wherein, A large spring is arranged in the middle sunk head part and covers the pressure rod.

7. The positioning pin of claim 2, wherein, An adjusting top wire is threadedly connected with the upper thread part and is pressed against the top end of the pressure rod.

8. The positioning pin of claim 1, wherein, The lower end of the outer pin is provided with an internal thread and a bottom cover is threadedly installed, and the bottom cover completely covers the lower end surface of the outer pin.

9. The positioning pin of claim 8, wherein, A bottom spring is arranged between the bottom cover and the inner pin, and the bottom spring is in a compressed state.

10. The positioning pin of claim 1, wherein, A slide guide groove parallel to the central axis is formed in the inner wall of the outer pin, an integral guide block is protrusively arranged on the outer wall of the inner pin, the guide block is movably fitted in the slide guide groove, a plurality of openings are formed in the slide guide groove along the line, and the openings are used for clamping the guide block.

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