Wear-resistant positioning pin assembly

Abstract

The utility model mainly relates to the technical field of positioning pins, in particular to a wear-resisting positioning pin assembly which comprises a positioning sleeve and a positioning rod piece detachably installed in the positioning sleeve, an annular material storage cavity is formed in the top of the positioning sleeve, and powder lubricating media are pre-stored in the annular material storage cavity. A plurality of first guide grooves which are evenly distributed are formed in the inner wall of the annular storage cavity, the tail ends of the first guide grooves penetrate through the outer wall of the positioning sleeve through the second guide grooves, columnar base bodies are slidably installed in the first guide grooves, first springs are arranged on the columnar base bodies, and arc-shaped abutting parts which are slidably arranged in the second guide grooves are formed in the columnar base bodies in an extending mode; the arc-shaped abutting part is partially exposed out of the outer wall of the positioning sleeve through the elastic force of the first spring; a guide through groove which penetrates through a body of the arc-shaped abutting part and extends into the columnar base body is formed in the end of the arc-shaped abutting part, and the guide through groove is communicated with a feeding hole formed in the surface of the columnar base body. During installation, the powder lubricating medium can reach the inner wall of the positioning hole for lubrication, abrasion is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This utility model mainly relates to the field of positioning pin technology, and specifically to a wear-resistant positioning pin assembly. Background Technology

[0002] Locating pins, as fundamental positioning elements in mechanical assembly, are widely used in molds, fixtures, and precision equipment. They achieve precise positioning through the interference fit between their outer wall and the workpiece's hole. Traditional locating pins often employ an integral cylindrical structure, manufactured from a single metal material (such as tool steel or cemented carbide) through quenching and grinding. In actual assembly, operators need to use external tools to hammer the end of the locating pin to embed it into the workpiece hole. Frequent installation and disassembly, along with high-intensity radial friction, easily lead to scratches, deformation, and even surface peeling on the outer wall of the locating pin, severely affecting positioning accuracy and shortening its service life. Furthermore, when the outer wall of the locating pin wears beyond the limit, the entire locating pin assembly must be discarded and replaced, resulting in material waste and increased maintenance costs. Therefore, they fail to meet the urgent needs of industrial scenarios for high reliability and low-cost maintenance of positioning elements. Utility Model Content

[0003] 1. The technical problem to be solved by the utility model:

[0004] This invention provides a wear-resistant positioning pin assembly to solve the technical problems existing in the background art.

[0005] 2. Technical Solution:

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows: a wear-resistant positioning pin assembly, including a positioning sleeve and a positioning rod detachably installed inside it, wherein the top of the positioning sleeve is provided with an annular storage cavity, and the annular storage cavity is pre-stored with powder lubricating medium;

[0007] The inner wall of the annular storage cavity is provided with a plurality of evenly distributed first guide grooves. The end of the first guide groove extends through the second guide groove to the outer wall of the positioning sleeve. A columnar base is slidably installed in the first guide groove. A first spring is provided on the columnar base, and an arc-shaped abutment portion is extended and slidably disposed in the second guide groove. The arc-shaped abutment portion is partially exposed to the outer wall of the positioning sleeve by the elastic force of the first spring.

[0008] The end of the arc-shaped contact portion is provided with a guide groove that penetrates its body and extends into the columnar substrate. The guide groove is connected to the feed hole opened on the surface of the columnar substrate.

[0009] Furthermore, the positioning rod is provided with an installation sleeve on its outer side, and the outer peripheral wall of the installation sleeve is formed with an external thread, which forms a threaded engagement with the internal thread opened on the inner wall of the positioning sleeve.

[0010] Furthermore, the inner circumferential wall of the mounting sleeve is evenly distributed with guide keys, which extend vertically and form a sliding fit with the groove opened on the outer circumferential wall of the positioning rod. The end of the guide key and the end of the groove are connected by a second spring.

[0011] Furthermore, a movable groove is provided at the bottom of the inner side of the positioning sleeve, and the movable groove is coaxial with the positioning rod and has the same radius.

[0012] Furthermore, it also includes a first annular body coaxially sleeved on the positioning rod, and a second annular body coaxially formed at the bottom of the first annular body with decreasing outer diameter, and the second annular body and the annular storage cavity are interlocked.

[0013] Furthermore, a rubber washer is fitted onto the positioning rod, and the rubber washer is located above the first annular body.

[0014] 3. Beneficial effects:

[0015] Compared with the prior art, the technical solution provided by this utility model has the following advantages: When the positioning sleeve is severely worn, it can be replaced separately, thereby avoiding material waste and reducing maintenance costs. When the positioning sleeve is inserted into the positioning hole of the workpiece, the part of the arc-shaped abutment portion exposed on the outer wall of the positioning sleeve will abut against the inner wall of the positioning hole, thereby pushing the columnar base to slide inward in the first guide groove until the feed hole extends into the annular storage cavity. At this time, in conjunction with the vibration generated by the hammer, the powder lubricating medium in the annular storage cavity can enter the guide groove through the feed hole and finally reach the inner wall of the positioning hole, thereby playing a lubricating role, reducing the wear of the outer wall of the positioning sleeve, and extending its service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the longitudinal section structure of this utility model;

[0019] Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle;

[0020] Figure 5 This is a schematic diagram of the transverse cross-section structure of this utility model;

[0021] Figure 6 For the present utility model Figure 5 Enlarged structural diagram at point B.

[0022] Figure label:

[0023] 1. Positioning sleeve; 101. Annular storage cavity; 102. First guide groove; 103. Second guide groove; 104. Internal thread; 105. Movable groove; 2. Positioning rod; 201. Slide groove; 3. Columnar base; 31. Arc-shaped abutment part; 311. Guide through groove; 312. Feed hole; 4. First spring; 5. Guide key; 6. Second spring; 7. First annular body; 8. Second annular body; 9. Rubber gasket; 10. Mounting sleeve; 1001. External thread. Detailed Implementation

[0024] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Example

[0028] See attached document Figure 1-6 A wear-resistant positioning pin assembly includes a positioning sleeve 1 and a positioning rod 2 detachably installed inside it. The top of the positioning sleeve 1 is provided with an annular storage cavity 101, and the annular storage cavity 101 is pre-stored with powder lubricating medium.

[0029] The inner wall of the annular storage cavity 101 is provided with a plurality of evenly distributed first guide grooves 102. The end of the first guide groove 102 passes through the second guide groove 103 to the outer wall of the positioning sleeve 1. A columnar base 3 is slidably installed in the first guide groove 102. A first spring 4 is provided on the columnar base 3, and an arc-shaped abutment part 31 is slidably disposed in the second guide groove 103. The arc-shaped abutment part 31 is partially exposed to the outer wall of the positioning sleeve 1 by the elastic force of the first spring 4.

[0030] The arc-shaped contact portion 31 has a guide groove 311 that penetrates its body and extends into the columnar base 3. The guide groove 311 communicates with the feed hole 312 opened on the surface of the columnar base 3.

[0031] In this embodiment, the positioning rod 2 is detachably installed on the positioning sleeve 1, so when the positioning sleeve 1 is severely worn, it can be replaced separately, thereby avoiding material waste and reducing maintenance costs.

[0032] When the positioning sleeve 1 is inserted into the positioning hole of the workpiece, the portion of the arc-shaped abutment part 31 that is partially exposed on the outer wall of the positioning sleeve 1 will abut against the inner wall of the positioning hole, thereby pushing the columnar base 3 to slide inward in the first guide groove 102 until the feed hole 312 extends into the annular storage cavity 101. At this time, in conjunction with the vibration generated by the hammer, the powder lubricating medium in the annular storage cavity 101 can enter the guide groove 311 through the feed hole 312 and finally reach the inner wall of the positioning hole, thereby playing a lubricating role, reducing the wear of the outer wall of the positioning sleeve 1, and extending its service life.

[0033] The positioning rod 2 is provided with an installation sleeve 10 on its outer side. The outer peripheral wall of the installation sleeve 10 is formed with an external thread 1001. The external thread 1001 and the internal thread 104 opened on the inner wall of the positioning sleeve 1 form a threaded engagement.

[0034] In this embodiment, the threaded engagement of the external thread 1001 and the internal thread 104 enables easy disassembly and installation of the positioning rod 2 and the positioning sleeve 1.

[0035] The inner circumferential wall of the mounting sleeve 10 is evenly distributed with guide keys 5. The guide keys 5 extend in the vertical direction and form a sliding fit with the groove 201 opened on the outer circumferential wall of the positioning rod 2. The end of the guide key 5 and the end of the groove 201 are connected by a second spring 6.

[0036] The bottom inner side of the positioning sleeve 1 is provided with a movable groove 105, which is coaxial with the positioning rod 2 and has the same radius.

[0037] In this embodiment, when the positioning rod 2 is struck by a hammer, it can move within the movable groove 105 through the sliding engagement of the guide key 5 and the slide groove 201, and return to its original position through the second spring 6, thereby reducing the damage to the external thread 1001 and the internal thread 104 caused by the impact.

[0038] It also includes a first annular body 7 coaxially sleeved on the positioning rod 2, and a second annular body 8 coaxially formed at the bottom of the first annular body 7 with decreasing outer diameter, and the second annular body 8 and the annular storage cavity 101 are connected in an insertion fit.

[0039] The positioning rod 2 is also fitted with a rubber washer 9, which is located above the first annular body 7.

[0040] In this embodiment, when the positioning rod 2 and the positioning sleeve 1 are installed, they will squeeze the second annular body 8 into the annular storage cavity 101 to close it. The rubber gasket 9 can provide shock absorption and buffer and protect the first annular body 7.

[0041] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0042] It should be noted that the above content falls within the scope of the inventor's technical knowledge. Due to the vast and complex nature of the technical content in this field, the above content of this application does not necessarily constitute prior art.

Claims

1. A wear-resistant dowel assembly, characterized by: The utility model relates to a positioning sleeve (1) and detachable installation positioning rod piece (2) in its inside, the top of positioning sleeve (1) is equipped with annular storage cavity (101), and the annular storage cavity (101) has pre-stored powder lubricating medium; Annular storage cavity (101) inner wall is equipped with a plurality of evenly distributed first guide groove (102), and the first guide groove (102) end penetrates to the outer wall of positioning sleeve (1) through second guide groove (103), the first guide groove (102) is slidably installed with columnar matrix (3), the first spring (4) is equipped on columnar matrix (3), and the arc abutment portion (31) that slides in second guide groove (103) is formed in extension, the arc abutment portion (31) is kept partially exposed to the outer wall of positioning sleeve (1) by the elastic force of first spring (4); The arc abutment portion (31) end is equipped with the guide through slot (311) that penetrates its body and extends to columnar matrix (3), and the guide through slot (311) is communicated with the feed hole (312) formed on the surface of columnar matrix (3).

2. A wear-resistant dowel assembly according to claim 1, wherein: The outer peripheral wall of mounting sleeve (10) is formed with external thread (1001), and the external thread (1001) is threadedly connected with the internal thread (104) formed on the inner wall of positioning sleeve (1).

3. A wear-resistant dowel assembly according to claim 2, wherein: The inner peripheral wall of mounting sleeve (10) is evenly distributed with guide sliding key (5) in circumference, the guide sliding key (5) extends along the vertical direction and is slidably connected with the sliding groove (201) formed on the outer peripheral wall of positioning rod piece (2), and the end of guide sliding key (5) is connected with the end of sliding groove (201) through second spring (6).

4. A wear-resistant dowel assembly according to claim 3, wherein: The inner side bottom of positioning sleeve (1) is equipped with movable slot (105), and the movable slot (105) is coaxial with positioning rod piece (2) and has the same radius.

5. A wear-resistant dowel assembly according to claim 1, wherein: It further comprises a first annular body (7) coaxially sleeved on the positioning rod piece (2), and the bottom of the first annular body (7) is integrally formed with a second annular body (8) coaxial and decreasing in outer diameter, and the second annular body (8) is in plug-in connection with the annular storage cavity (101).

6. A wear-resistant dowel assembly according to claim 1, wherein: The positioning rod piece (2) is further sleeved with a rubber gasket (9) above the first annular body (7).

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