Tapered positioning pin structure of elastic telescopic gauge

Abstract

The utility model discloses an elastic telescopic gauge conical positioning pin structure, which comprises a base, a guide sleeve, a spring, a positioning pin and a limit screw, a groove is arranged in the middle of the base, the lower end of the guide sleeve is arranged in the groove of the base, a first through hole is arranged on the side edge of the base, and an inner hole is arranged in the middle of the guide sleeve. The lower end of the positioning pin is a cylinder, the upper end of the positioning pin is of a cone structure, meanwhile, the lower end of the positioning pin is provided with a kidney-shaped groove, the lower end of the positioning pin is inserted into the inner hole of the guide sleeve, and the limiting screw is inserted from one side of the first through hole. According to the conical positioning pin structure of the elastic telescopic gauge, the positioning accuracy and the positioning stability of the gauge are improved, the positioning error and the measurement error of a part are reduced, and a higher measurement guarantee is provided for production and manufacturing of the part.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts inspection tools, specifically relating to the positioning of automotive parts on inspection tools. Background Technology

[0002] In automotive inspection fixtures, the parts to be inspected are generally positioned using two reference holes, B and C, and a reference surface, A. The positional tolerance of reference hole B is generally 0, serving as the primary reference. However, the hole diameter has a tolerance. The corresponding B locating pin on the fixture is designed according to the principle of the maximum material condition of the part's hole, i.e., the lower limit of the hole diameter limit. The size of the locating pin is fixed. When the hole diameter of the actual manufactured part deviates from the upper limit, positioning gaps will occur, causing positioning wobbling. The part cannot be positioned very accurately. For parts with high inspection accuracy requirements, the inspection accuracy of the fixture will be affected to some extent. Utility Model Content

[0003] The purpose of this utility model is to provide a conical positioning pin structure for an elastic telescopic gauge, in order to solve the problem that the existing positioning pins in the background art have fixed dimensions. When the hole diameter of the part being produced is off to the upper limit, positioning gaps will occur, causing positioning wobbling. The part cannot be positioned very accurately, and for parts with higher detection accuracy requirements, the detection accuracy of the gauge will be affected to a certain extent.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a conical positioning pin structure for an elastic telescopic gauge, comprising a base, a guide sleeve, a spring, a positioning pin, and a limiting screw. The base has a groove in the middle, and the lower end of the guide sleeve is installed in the groove of the base. The base also has a first through hole on its side. The guide sleeve has an inner hole in the middle, and a second through hole on its side. The spring is inserted into the bottom of the groove of the base through the inner hole on the guide sleeve. The positioning pin has a cylindrical lower end and a conical upper end, and a waist-shaped groove at its lower end. The lower end of the positioning pin is inserted into the inner hole of the guide sleeve. The limiting screw is inserted from one side of the first through hole, passes through the second through hole and the waist-shaped groove, and is then locked inside the other side of the first through hole.

[0005] Preferably, a first screw hole is provided around the inner hole, and a second screw hole corresponding to the first screw hole is provided around the groove.

[0006] Preferably, the first screw hole is a countersunk hole.

[0007] Preferably, the base has round holes on both sides of its bottom.

[0008] Preferably, the guide sleeve is fixed to the base by screws.

[0009] Preferably, the first through hole has internal threads that engage with the threads of the limiting screw.

[0010] Preferably, there are four first screw holes.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: the top positioning part of the positioning pin is designed to be tapered, making it easier to insert the positioning hole of the part to be tested into the positioning pin. When the positioning hole of the part to be tested is inserted into the positioning pin, a certain circle of the tapered part of the positioning pin will always contact the wall of the hole. After contact, under the downward pressure of the part, the positioning pin will be pressed down until the surface of the part is also guided to fit the surface. The positioning pin will always maintain complete contact with the hole of the part without gap. This results in higher positioning accuracy, more accurate detection of the corresponding part, improved positioning accuracy and stability of the fixture, reduced positioning and measurement errors of the part, and higher measurement assurance for the production and manufacturing of the part. Attached Figure Description

[0012] Figure 1 This is a partial cross-sectional view of the three-dimensional structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the base structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the guide sleeve structure of this utility model;

[0015] Figure 4 This is a schematic diagram of the positioning pin structure of this utility model;

[0016] Figure 5 This is a schematic diagram of the limiting screw structure of this utility model;

[0017] Figure 6 This is a schematic diagram of the application structure of this utility model;

[0018] Figure 7 This utility model Figure 6 Schematic diagram of the structure of section A.

[0019] In the diagram: 1. Base; 2. Guide sleeve; 3. Spring; 4. Positioning pin; 5. Limiting screw; 101. Groove; 102. First through hole; 103. Second screw hole; 104. Round hole; 201. Inner hole; 202. Second through hole; 203. First screw hole; 401. Waist-shaped groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-7 This utility model provides a technical solution: a conical positioning pin structure for an elastic telescopic gauge, including a base 1, a guide sleeve 2, a spring 3, a positioning pin 4, and a limiting screw 5. The base 1 has a groove 101 in the middle, and the lower end of the guide sleeve 2 is installed in the groove 101 of the base 1. A first through hole 102 is provided on the side of the base 1. An inner hole 201 is provided in the middle of the guide sleeve 2, and a second through hole 202 is provided on the side of the guide sleeve 2. The spring 3 is inserted into the bottom of the groove 101 of the base 1 through the inner hole 201 on the guide sleeve 2. The lower end of the positioning pin 4 is cylindrical, and the upper end is conical. The lower end of the positioning pin 4 is provided with a waist-shaped groove 401. The positioning pin 4 can move downward under the pressure of external force, and when the external force is released, it can be pushed upward under the action of spring force. The lower end of the positioning pin 4 is inserted into the inner hole 201 of the guide sleeve 2. The limiting screw 5 is inserted from one side of the first through hole 102, passes through the second through hole 202 and the waist-shaped groove 401 respectively, and is locked to the other side of the first through hole 102. This design can prevent the positioning pin 4 from falling out of the inner hole 201.

[0022] In this example, the inner hole 201 is provided with first screw holes 203 around its perimeter, and the groove 101 is provided with second screw holes 103 corresponding to the first screw holes 203 around its perimeter. The guide sleeve 2 is fixed to the base 1 with screws, which facilitates disassembly and installation.

[0023] In this example, the first screw hole 203 is a countersunk hole. The countersunk hole ensures that the screw head will not protrude above the upper plane of the guide sleeve 2 after the screw is tightened.

[0024] In this example, the base 1 has round holes 104 on both sides of its bottom, which makes it easy to install the base 1 on the gauge base plate or support by screws or pins.

[0025] In this example, the guide sleeve 2 is fixed to the base 1 by screws.

[0026] In this example, the first through hole 102 has a thread inside, which matches the thread of the limiting screw 5, making it convenient to fix each component with the limiting screw 5.

[0027] In this example, there are four screw holes 203.

[0028] Working principle: During assembly, first install the lower end of the guide sleeve 2 in the groove 101 of the base 1 and adjust its direction so that the second through hole 202 on the guide sleeve 2 is aligned with the first through hole 102 on the base 1, and the first screw hole 203 on the guide sleeve 2 is aligned with the second screw hole 103 on the base 1. Then, fix the guide sleeve 2 and the base 1 together with four screws. Insert the spring 3 into the groove 101 of the base 1 through the inner hole 201 of the guide sleeve 2. Then, insert the cylindrical end of the positioning pin 4 downward into the inner hole 201 of the guide sleeve 2 so that it presses on the spring 3. Align the opening direction of the waist-shaped groove 401 of the positioning pin 4 with the second through hole 202 on the guide sleeve 2. Then, insert the limiting screw 5 from one side of the first through hole 102 of the base 1, pass through the second through hole 202 and the waist-shaped groove 401 respectively, and lock it into the threaded hole on the other side of the first through hole 102 of the base 1 through the thread. Finally, install the base 1 on the inspection base plate or support with screws or pins. The assembly structure is complete.

[0029] When using the elastic telescopic gauge with tapered locating pin structure, after the part to be inspected comes into contact with the locating pin, the locating pin is pressed down under the pressure of the part until the part fits against the locating surface. This positioning is more accurate than that of conventional fixed locating pins and is not affected by changes in the diameter of the part's locating hole. It can always keep the center of the locating hole in the same position, thus completing the entire work. Furthermore, the contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0030] The terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A conical positioning pin structure for an elastic telescopic gauge, comprising a base (1), a guide sleeve (2), a spring (3), a positioning pin (4), and a limiting screw (5), characterized in that: The base (1) has a groove (101) in the middle, and the lower end of the guide sleeve (2) is installed in the groove (101) of the base (1). At the same time, the base (1) has a first through hole (102) on the side. The guide sleeve (2) has an inner hole (201) in the middle, and a second through hole (202) on the side. The spring (3) is inserted into the bottom of the groove (101) of the base (1) through the inner hole (201) on the guide sleeve (2). The lower end of the positioning pin (4) is cylindrical and the upper end is conical. The lower end of the positioning pin (4) has a waist-shaped groove (401). The lower end of the positioning pin (4) is inserted into the inner hole (201) of the guide sleeve (2). The limiting screw (5) is inserted from one side of the first through hole (102), passes through the second through hole (202) and the waist-shaped groove (401) respectively, and is locked to the other side of the first through hole (102).

2. The elastic telescopic gauge conical positioning pin structure according to claim 1, characterized in that: The inner hole (201) is provided with a first screw hole (203) around its perimeter, and the groove (101) is provided with a second screw hole (103) corresponding to the first screw hole (203) around its perimeter.

3. The elastic telescopic gauge tapered positioning pin structure according to claim 2, characterized in that: The first screw hole (203) is a countersunk hole.

4. The elastic telescopic gauge conical positioning pin structure according to claim 3, characterized in that: The base (1) has round holes (104) on both sides of its bottom.

5. The elastic telescopic gauge conical positioning pin structure according to claim 4, characterized in that: The guide sleeve (2) is fixed to the base (1) by screws.

6. The elastic telescopic gauge conical positioning pin structure according to claim 5, characterized in that: The first through hole (102) has a thread inside, which is matched with the thread of the limiting screw (5).

7. The elastic telescopic gauge conical positioning pin structure according to claim 2, characterized in that: There are four first screw holes (203).

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