Positioning pin and tool jig

Abstract

The positioning pin comprises a pin sleeve, a floating pin, a plunger and a spring, a through hole is formed in the pin sleeve in the axial direction, the floating pin is movably matched in the through hole, the diameter of one end of the through hole is smaller than that of the other end of the through hole, a step is formed at the diameter changing position of the through hole, and the floating pin sequentially comprises a positioning section, a guiding section and a limiting section. The positioning section extends out of one end of the through hole and comprises a frustum positioning section and a columnar positioning section, the larger-diameter end of the frustum positioning section is connected with the guiding section, the smaller-diameter end of the frustum positioning section is connected with the columnar positioning section, the diameter of the limiting section is larger than that of the guiding section, the guiding section is installed at the smaller-diameter end of the through hole, and the limiting section is installed at the larger-diameter end of the through hole; the plunger is fixedly installed at the other end of the through hole, and a spring is arranged between the floating pin and the plunger. The positioning pin provided with the frustum positioning section can automatically adjust the up-down floating amount according to the size of the product positioning hole, can better adapt to the product positioning holes with different diameters, and is wider in application range and more stable in positioning.

Description

Technical Field

[0001] The utility model relates to the field of product positioning tooling fixtures, in particular to a positioning pin. Background Art

[0002] During the production or assembly of products, it is generally necessary to position parts. At present, positioning is generally carried out by the cooperation of a positioning pin and a hole of a part. However, the existing positioning pin can only position parts with positioning holes of one hole diameter, with problems of narrow application range, unstable positioning, and difficult confirmation of the positioning position. Summary of the Utility Model

[0003] Based on this, the main purpose of the utility model is to provide a positioning pin for a tooling fixture that can automatically adjust the up and down floating amount according to the size of the product positioning hole.

[0004] A positioning pin includes a pin sleeve, a floating pin, a plunger and a spring. The pin sleeve is axially provided with a through hole. The floating pin is movably fitted in the through hole. The diameter of one end of the through hole is smaller than that of the other end. A step is formed at the change of the through hole diameter. The floating pin sequentially includes a positioning section, a guiding section and a limiting section. The positioning section extends out of one end of the through hole. The positioning section includes a frustum positioning section and a cylindrical positioning section. The larger diameter end of the frustum positioning section is connected to the guiding section. The smaller diameter end of the frustum positioning section is connected to the cylindrical positioning section. The guiding section is installed at the smaller diameter end of the through hole. The limiting section is installed at the larger diameter end of the through hole. The plunger is fixedly installed at the other end of the through hole. A spring is provided between the floating pin and the nut.

[0005] Further, the frustum positioning section includes an opposite top surface and bottom surface. The diameter of the top surface is smaller than that of the bottom surface. The diameter of the cylindrical positioning section is equal to that of the top surface. The diameter of the guiding section is equal to that of the bottom surface.

[0006] Further, the length of the guiding section is greater than the length of the smaller diameter end of the through hole.

[0007] Further, one end of the positioning section away from the guiding section is spherical.

[0008] Further, the plunger has an external thread and is connected to the other end of the through hole through the external thread.

[0009] Further, the plunger is an internal hexagonal bolt.

[0010] Further, the plunger is a slotted bolt.

[0011] Further, the end face of the pin sleeve at the smaller diameter end of the through hole is stepped.

[0012] The present application also provides a tooling fixture, which includes the positioning pin described in any one of the foregoing items.

[0013] Further, the tooling fixture further includes a fixture cover plate, a fixture and a base. The positioning pin is installed on the fixture. The fixture is arranged between the cover plate and the base. The base is provided with an electromagnet for adsorbing the fixture cover plate.

[0014] Advantageous effects of the present utility model:

[0015] In the present application, there is a floating pin with a frustum positioning section. The spring holds the floating pin at the highest position. During the process of the product being adapted to the fixture, when the product positioning hole is larger, the product positioning hole abuts against the outer surface of the larger end of the frustum positioning section of the floating pin, and the floating pin presses down the spring and moves downward a smaller distance. When the positioning hole is smaller, the product positioning hole abuts against the outer surface of the smaller end of the frustum positioning section of the floating pin or the cylindrical positioning section, and the floating pin presses down the spring and moves downward a larger distance, so that the floating pin can better adapt to product positioning holes with different diameters, and the floating pin can automatically adjust the up and down floating amount according to the diameter of the product positioning hole. When the product hole diameter is large, the downward movement amount of the floating pin is small, and when the product hole diameter is small, the downward movement amount of the floating pin is large. The application range is wider and the positioning is more stable. Description of the drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 It is a schematic cross-sectional view of the overall structure of the positioning pin of the tooling fixture;

[0018] Figure 2 It is a schematic diagram of the overall structure of the positioning pin of the tooling fixture;

[0019] Figure 3 It is a schematic diagram of the overall structure when the positioning pin of the tooling fixture is placed in the fixture.

[0020] Names and serial numbers of components in the figure;

[0021] 1 - bushing; 11 - through hole; 111 - step; 2 - floating pin; 21 - positioning section; 211 - frustum positioning section; 2111 - top surface; 2112 - bottom surface; 212 - cylindrical positioning section; 22 - guiding section; 23 - limiting section; 3 - spring; 4 - plunger; 5 - fixture cover plate; 6 - product; 7 - fixture; 8 - base; 81 - electromagnet.

[0022] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, "and / or" throughout the text includes three scenarios. Taking A and / or B as an example, it includes the technical solution of A, the technical solution of B, and the technical solution that A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0026] Referring to Figure 1 , the present utility model provides a positioning pin, which includes a pin sleeve 1, a floating pin 2, a spring 3 and a plunger 4. The pin sleeve 1 is provided with a through hole 11 along the axis. The floating pin 2 is slidably fitted in the through hole 11. One end of the through hole 11 has a smaller diameter than the other end, and a step 111 is formed at the diameter change of the through hole 11. The floating pin 2 successively includes a positioning section 21, a guiding section 22 and a limiting section 23. One end of the positioning section 21 extends out of the through hole 11. The positioning section 21 includes a frustum positioning section 211 and a columnar positioning section 212. The larger diameter end of the frustum positioning section 211 is connected to the guiding section 22, and the smaller diameter end of the frustum positioning section 211 is connected to the columnar positioning section 212. The guiding section 22 is installed at the smaller diameter end of the through hole 11, and the limiting section 23 is installed at the larger diameter end of the through hole 11. The plunger 4 is installed at the other end of the through hole 11, and a spring 3 is provided between the floating pin 2 and the plunger 4.

[0027] In this application, there is a floating pin 2 provided with a frustum positioning section 211. The spring 3 holds the floating pin 2 at the highest position. During the adaptation process of the product 6 and the fixture 7, when the positioning hole of the product 6 is larger, the positioning hole of the product 6 abuts against the outer surface of the larger end of the frustum positioning section 211 of the floating pin 2, and the floating pin 2 presses down the spring 3 and moves downward a small distance. When the positioning hole is smaller, the positioning hole of the product 6 abuts against the outer surface of the smaller end of the frustum positioning section 211 of the floating pin 2 or the cylindrical positioning section 212, and the floating pin 2 presses down the spring 3 and moves downward a larger distance, enabling the floating pin 2 to better adapt to product positioning holes with different diameters. Moreover, the floating pin 2 can automatically adjust the up-and-down floating amount according to the diameter of the product positioning hole. When the product aperture is large, the downward movement amount of the floating pin is small; when the product aperture is small, the downward movement amount of the floating pin is large. The applicable range is wider and the positioning is more stable.

[0028] Specifically, the frustum positioning section 211 includes an opposite top surface 2111 and a bottom surface 2112. The diameter of the cylindrical positioning section 212 is equal to the diameter of the top surface 2111. In this case, when the product positioning hole is positioned, it can better transition from the cylindrical positioning section 212 to the frustum positioning section 211; the diameter of the guiding section 22 is equal to the diameter of the bottom surface 2112, which can enhance the stiffness of the positioning section 21 and prevent the positioning section 21 from deforming easily.

[0029] Specifically, the length of the guiding section 22 is greater than the length of the smaller-diameter end of the through hole 11, so that the positioning section 211 can completely extend out of the pin sleeve 1. When the floating pin 2 is subjected to a downward external force, it will slide downward relative to the pin sleeve 1. At this time, the guiding section 22 with a larger length can slide more smoothly in the through hole 11; if the length of the guiding section 22 is less than the length of the smaller-diameter end of the through hole 11, the angle formed at the connection between the frustum positioning section 211 and the guiding section 22 will rub against the wall surface of the through hole 11, easily causing jamming.

[0030] Reference Figure 3 , a tooling fixture, including the above-mentioned positioning pin.

[0031] Specifically, it further includes a fixture cover plate 5, a fixture 7, and a base 8. The positioning pin is installed on the fixture 7, and the fixture 7 is arranged between the fixture cover plate 5 and the base 8. The base 8 is provided with an electromagnet 81 for adsorbing the fixture cover plate 5.

[0032] In this embodiment, the end of the positioning section 211 away from the guiding section 22 is a spherical surface. Before positioning the product, first place the positioning pin into a specific positioning hole in the fixture 7 for fixation, place the fixture 7 on the top surface of the base 8, and then place the product positioning hole onto the cylindrical positioning section 212. The spherical surface makes it smoother when the product positioning hole is placed onto the cylindrical positioning section 212 and is not likely to cause jamming. Finally, manually place the fixture cover plate 5 on the upper end of the product. After the preparation work is completed, there is a small gap between the bottom of the product and the surface of the fixture, and the gap is 1.16 mm. The electromagnet 81 is energized to tightly attract the fixture cover plate 5, so that the fixture cover plate 5 has a downward acting force to press the product downward until the bottom of the product 6 is completely attached to the surface of the fixture 7. The positioning pin will automatically adjust the up and down movement amount of the floating pin 2 according to the size of the product positioning hole. When the positioning hole is larger, the floating pin 2 moves upward until the outer surface of the tapered positioning section 211 of the floating pin 2 closely adheres to the product positioning hole. When the positioning hole is smaller, the floating pin 2 moves downward until the outer surface of the tapered positioning section 211 of the floating pin 2 closely adheres to the product positioning hole, effectively avoiding excessive product positioning errors caused by fluctuations in the size of the positioning hole and affecting the processing accuracy.

[0033] Reference Figure 2 , in this embodiment, the plunger 4 has an external thread and is connected to the other end of the through hole 11 through the external thread.

[0034] Specifically, in this application, the plunger 4 is an internal hexagonal bolt. When assembling the positioning pin of the tooling fixture, first install the floating pin 2 into the pin sleeve 1 with the through hole 11, then install the spring 3, and finally use a wrench to tighten the internal hexagonal bolt at the other end of the through hole 11; in another embodiment, the plunger 4 is a slotted bolt, and a screwdriver is used to screw the plunger 4 into the pin sleeve 1.

[0035] Furthermore, the end face of the pin sleeve near the smaller diameter end of the through hole is stepped.

[0036] Working principle: First, place the positioning pin of the tooling fixture into the specific positioning hole of the fixture 7 for fixation, place the fixture 7 on the top surface of the base 8, then place the product positioning hole on the columnar positioning section 212, and finally manually place the fixture cover plate 5 on the upper end of the product. After the preparation work is completed, there is a small gap between the bottom of the product and the surface of the fixture, and the gap is 1.16 mm. The electromagnet 81 is energized to tightly suck the fixture cover plate 5, so that the fixture cover plate 5 has a downward acting force to press the product downward until the bottom of the product 6 is completely attached to the surface of the fixture 7. During the adaptation process of the product 6 and the fixture 7, when the positioning hole of the product 6 is larger, the positioning hole of the product 6 abuts against the outer surface of the larger end of the tapered positioning section 211 of the floating pin 2, and the floating pin 2 presses the spring 3 to move downward a small distance. When the positioning hole is smaller, the positioning hole of the product 6 abuts against the outer surface of the smaller end of the tapered positioning section 211 of the floating pin 2 or the columnar positioning section 212, and the floating pin 2 presses the spring 3 to move downward a larger distance, so that the floating pin 2 can better adapt to product positioning holes with different diameters, and the floating pin 2 can adjust its up and down floating amount according to the diameter of the product positioning hole. When the product hole diameter is large, the downward movement amount of the floating pin is small, and when the product hole diameter is small, the downward movement amount of the floating pin is large, effectively avoiding excessive product positioning errors caused by fluctuations in the size of the positioning hole and affecting the processing accuracy.

[0037] The above is only the preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A positioning pin, characterized in that: It includes a pin sleeve, a floating pin, a plunger and a spring, the pin sleeve is axially provided with a through hole, the floating pin is slidably fitted in the through hole, the diameter of one end of the through hole is smaller than the other end, a step is formed at the place where the diameter of the through hole changes, the floating pin comprises a positioning section, a guide section and a limiting section in sequence, the positioning section extends out of one end of the through hole, the positioning section comprises a frustum positioning section and a columnar positioning section, the larger diameter end of the frustum positioning section is connected to the guide section, the smaller diameter end of the frustum positioning section is connected to the columnar positioning section, the diameter of the limiting section is larger than the diameter of the guide section, the guide section is installed at the smaller diameter end of the through hole, the limiting section is installed at the larger diameter end of the through hole, the plunger is fixedly installed at the other end of the through hole, and a spring is provided between the floating pin and the plunger.

2. A positioning pin according to claim 1, characterized in that: The frustum positioning section comprises a top surface and a bottom surface which are opposite to each other. The diameter of the columnar positioning section is equal to the diameter of the top surface, and the diameter of the guide section is equal to the diameter of the bottom surface.

3. A positioning pin according to claim 1, characterized in that: The length of the guide section is greater than the length of the end with a smaller diameter of the through hole.

4. A positioning pin according to claim 1, characterized in that: One end of the positioning section away from the guiding section is a spherical surface.

5. A positioning pin according to claim 1, characterized in that: The plunger has an external thread and is connected to the other end of the through hole via the external thread.

6. A positioning pin according to claim 5, characterized in that: The plunger is a hexagon socket bolt.

7. A positioning pin according to claim 5, characterized in that: The plunger is a slotted bolt.

8. A positioning pin according to claim 1, characterized in that: The end surface of the pin sleeve at the end of the through hole with a smaller diameter is stepped.

9. A tooling fixture, characterized in that: Including the positioning pin described in any one of claims 1-8.

10. A tooling fixture according to claim 9, characterized in that: It also includes a jig cover, a jig and a base, the positioning pin is installed on the jig, the jig is arranged between the cover and the base, and the base is provided with an electromagnet for adsorbing the jig cover.

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