Internal expansion positioning pin

Abstract

The utility model relates to an internal expansion positioning pin which comprises a pin body, an installation cavity is formed in the pin body, a plurality of sliding openings communicated with the installation cavity are formed in the side face of the pin body, expansion blocks matched with the sliding openings are arranged in the sliding openings in a sliding mode, and a driving column is connected in the installation cavity in a threaded mode. A circular-truncated-cone-shaped expansion jacking column with the small head end facing downwards is formed at the lower end of the driving column, and the expansion jacking column can abut against the inner side face of the expansion block to eject the outer side face of the expansion block out of the sliding opening when rotating downwards in the mounting cavity along with the driving column. According to the internal expansion positioning pin, the machining difficulty of the pin body is reduced, operation during positioning pin installation is facilitated, the expansion block abuts against the inner wall of the pin hole so that the pin body can be stably kept in the pin hole, the positioning pin is prevented from being disengaged from the pin hole, and the stability of the positioning pin after installation is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of hardware, in particular to an internal expansion positioning pin. Background Art

[0002] The locating pin is a hardware part that fixes and positions two structural parts by cooperating with the pin holes opened on the structural parts. During the machining, assembly and movement process, the locating pin is inserted into the pin holes of the structural parts to play a restraining role between the structural parts, which can improve the assembly efficiency of the product.

[0003] Existing locating pins are generally in the shape of polished rods. In order to ensure that the locating pins play an accurate fixing and positioning role when inserted into the pin holes, high precision is required during the processing of the locating pins to reduce the clearance between the locating pins and the inner wall of the pin holes after they are inserted into the pin holes. If there is a deviation between the inner diameter of the locating pins and the pin holes, the locating pins may easily fall out of the pin holes or cannot be conveniently inserted into the pin holes.

[0004] In view of the above problems, the present invention makes improvements. Utility Model Content

[0005] The utility model provides an internal expansion positioning pin, which solves the above-mentioned problems existing in the prior art during use.

[0006] The technical solution of the present utility model is achieved as follows:

[0007] An internal expansion positioning pin comprises a pin body, an installation cavity is provided in the pin body, a plurality of sliding openings connected to the installation cavity are provided on the side surface of the pin body, an expansion block matching the sliding opening is slidably provided in the sliding opening, a driving column is screwed in the installation cavity, a truncated cone-shaped expansion top column with a small head facing downward is formed at the lower end of the driving column, and the expansion top column can abut against the inner side surface of the expansion block when the driving column rotates downward in the installation cavity, thereby pushing the outer side surface of the expansion block out of the sliding opening.

[0008] Preferably, a limiting block is formed on the inner side surface of the expansion block so that the cross section of the expansion block is T-shaped.

[0009] Preferably, the outer side surface of the expansion block is in an arc shape, and the inner side surface of the expansion block is formed with a first positioning surface matched with the driving column and a second positioning surface matched with the expansion top column, which are connected and distributed up and down.

[0010] Preferably, an anti-slip pad layer is provided on the outer side surface of the expansion block.

[0011] Preferably, a plurality of snap-in grooves are provided on the outer surface of the expansion block, and a plurality of snap-in protrusions matching the snap-in grooves are formed on the inner surface of the anti-slip pad layer. The snap-in protrusions are snapped into the snap-in grooves to achieve a fixed connection between the anti-slip pad layer and the expansion block.

[0012] Preferably, the installation cavity passes through the pin body from top to bottom, a limiting ring is formed at the upper end of the pin body, and a plurality of swing openings connected to the installation cavity are opened at the lower end, and the swing opening is rotatably provided with an inverted L-shaped limiting swing arm, and a swing top column is formed at the lower end of the expansion top column, and the horizontal flat part of the limiting swing arm extends into the installation cavity and is located below the swing top column.

[0013] Preferably, the limiting ring is in the shape of a fan ring.

[0014] To sum up, the beneficial effect of the present invention is that after the pin body is inserted into the pin hole, the expansion block is pushed tightly against the inner wall of the pin hole by the expansion column to achieve fixed installation of the locating pin. The above method makes the outer diameter of the pin body smaller than the inner diameter of the pin hole, allowing a certain deviation value between the two sizes, reducing the difficulty of pin body processing, and because the outer diameter of the pin body is smaller than the inner diameter of the pin hole, the operation of inserting the pin body into the pin hole is very smooth and convenient, which facilitates the operation when installing the locating pin, and the expansion block is pressed against the inner wall of the pin hole to keep the pin body stably in the pin hole, preventing the locating pin from falling out of the pin hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0018] Figure 3 It is a cross-sectional schematic diagram of another direction of the utility model;

[0019] Figure 4 This is an exploded schematic diagram of the utility model;

[0020] Figure 5 This is a schematic structural diagram of the expansion block in the utility model;

[0021] Figure 6 It is a cross-sectional schematic diagram of the utility model in the expanded state.

[0022] In the figure: 1. Pin body; 11. Mounting cavity; 12. Sliding opening; 13. Limiting ring; 14. Swinging opening; 3. Expansion block; 31. Limiting block; 32. First positioning surface; 33. Second positioning surface; 34. Snap-fit ​​groove; 4. Driving column; 41. Expansion top column; 42. Swinging top column; 5. Anti-slip pad; 51. Snap-fit ​​protrusion; 6. Limiting swing arm. DETAILED DESCRIPTION

[0023] The following is a combination of the appended examples of the present invention Figure 1-6 , clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] As shown in the figure, an internal expansion positioning pin includes a pin body 1, an installation cavity 11 is opened in the pin body 1, and a plurality of sliding openings 12 connected to the installation cavity 11 are opened on the side of the pin body 1. An expansion block 3 matching the sliding opening 12 is slidably arranged in the sliding opening 12, and a driving column 4 is screwed in the installation cavity 11. The lower end of the driving column 4 is formed with a truncated cone-shaped expansion top column 41 with a small head facing downward. When the expansion top column 4 rotates downward in the installation cavity 11 as the driving column 4 rotates, it can abut against the inner side surface of the expansion block 3 and push the outer side surface of the expansion block 3 out of the sliding opening 12.

[0025] Specifically, a limiting block 31 is formed on the inner side surface of the expansion block 3 so that the cross section of the expansion block 3 is T-shaped.

[0026] Specifically, the outer side surface of the expansion block 3 is arc-shaped, and the inner side surface of the expansion block 3 is formed with a first positioning surface 32 matched with the driving column 4 and a second positioning surface 33 matched with the expansion top column 41 , which are connected and distributed up and down.

[0027] In the above structure, when installing the locating pin, the pin body 1 is inserted into the pin hole, and the driving column 4 is rotated through the hexagonal hole provided on the upper end surface of the driving column 4. The driving column 4 is screwed together with the inner wall of the installation cavity 11 and tightened downward during rotation. At the same time, the driving column 4 drives the expansion column 41 to rotate downward. In the process of the expansion column 41 rotating downward, the outer side surface of the expansion column 41 contacts the inner side surface of the expansion block 3, and the tapered outer side surface of the expansion column 41 drives several expansion blocks to slide at the sliding port. 12 at the same time slides outward, and the outer side surface of the expansion top block passes through the sliding opening 12 and is tightly against the inner wall of the pin hole, so that the positioning pin is installed in the pin hole. Through the above structure and method, the outer diameter of the pin body 1 is smaller than the inner diameter of the pin hole, and a certain deviation value is allowed between the two sizes, which reduces the difficulty of processing the pin body 1. Moreover, since the outer diameter of the pin body 1 is smaller than the inner diameter of the pin hole, the operation of inserting the pin body 1 into the pin hole is very smooth and convenient, which facilitates the operation when installing the positioning pin, and is tightly against the expansion block 3. The inner wall of the pin hole keeps the pin body 1 stably in the pin hole, preventing the positioning pin from falling out of the pin hole, and the limit block 31 formed on the inner side surface of the tightening block 3 plays a limiting role when the tightening block 3 slides outward in the sliding opening 12, preventing the tightening block 3 from falling out of the sliding opening 12 during the process of the pin body 1 being inserted into the pin hole, thereby facilitating the operation when installing the positioning pin, and when the driving column 4 drives the tightening top column 41 to push the tightening block 3 into place, the first positioning surface 32 and the second positioning surface 33 respectively align with the driving column 4 and the tightening top column 41 to push the tightening block 3 into place. The outer side surface of the column 41 fits tightly, which strengthens the supporting effect of the driving column 4 and the positioning column on the expansion block 3, thereby ensuring that the expansion block 3 is stably pressed against the inner wall of the pin hole and ensuring the stability of the positioning pin in the pin hole after installation. Of course, the length of the expansion block 3 and the position of the expansion block 3 on the pin body 1 can be adjusted as needed. Generally speaking, when installing the positioning pin to position and connect two structural members, the expansion block 3 can be set at the joint between the pin holes of the two structural members to enhance the stability of the two structural members after connection.

[0028] In addition, an anti-slip pad layer 5 is provided on the outer surface of the expansion block 3. The anti-slip pad layer 5 is in contact with the inner wall of the pin hole when the expansion block 3 is tightly pressed against the inner wall of the pin hole, thereby enhancing the friction between the expansion block 3 and the inner wall of the pin hole, thereby enhancing the stability of the locating pin after being installed in the pin hole. Moreover, through the deformation of the anti-slip pad layer 5, the deviation between the outer diameter of the pin body 1 and the inner diameter of the pin hole can be eliminated, thereby reducing the processing difficulty of the locating pin.

[0029] In addition, a plurality of snap-in grooves 34 are provided on the outer surface of the expansion block 3, and a plurality of snap-in protrusions 51 matching the snap-in grooves 34 are formed on the inner surface of the anti-slip pad layer 5. The snap-in protrusions 51 are snapped into the snap-in grooves 34 to achieve a fixed connection between the anti-slip pad layer 5 and the expansion block 3. The connection method between the anti-slip pad layer 5 and the expansion block 3 enables the anti-slip pad layer 5 to be easily disassembled and assembled, thereby facilitating the replacement of the anti-slip pad layer 5 when the locating pin is reused, so as to ensure the stability of the locating pin after being installed in the pin hole.

[0030] In addition, the installation cavity 11 passes through the pin body 1 from top to bottom, a limit ring 13 is formed on the upper end of the pin body 1, and a plurality of swing openings 14 communicating with the installation cavity 11 are opened at the lower end. The swing opening 14 is rotatably provided with an inverted L-shaped limit swing arm 6, and a swing top column 42 is formed at the lower end of the expansion top column 41. The horizontal flat portion of the limit swing arm 6 extends into the installation cavity 11 and is located below the swing top column 42. When installing the locating pin, the limit ring 13 abuts against the port of the pin hole, and the driving column 4 drives the expansion top column 41 to push the expansion block 3. At the same time, it drives the swinging top column 42 to rotate downward. During the downward rotation of the swinging top column 42, it contacts the horizontal part of the limiting swing arm 6 and drives the vertical part of the limiting swing arm 6 to swing outward in the swing opening 14, so that the vertical part of the limiting swing arm 6 swings out of the swing opening 14 and presses against the other end of the pin hole. The cooperation between the limiting ring 13 and the limiting swing arm 6 tightens the two connected structural parts to make them tightly connected, and applies axial limitation to the pin body 1, so that the pin body 1 can be kept more stably in the pin hole, thereby enhancing the stability of the locating pin after installation.

[0031] In addition, the limiting ring 13 is in the shape of a fan ring. After the locating pin is installed, the limiting ring 13 is embedded in the limiting groove that matches the limiting ring 13 on the pin hole end. The limiting groove applies circumferential limitation to the limiting ring 13 and applies circumferential limitation to the pin body 1, thereby enhancing the stability of the locating pin after installation.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An internal expansion positioning pin, comprising a pin body (1), characterized in that: The pin body (1) is provided with an installation cavity (11), and a plurality of sliding openings (12) communicating with the installation cavity (11) are provided on the side of the pin body (1). A tightening block (3) matching the sliding opening (12) is slidingly provided in the sliding opening (12), and a driving column (4) is screwed in the installation cavity (11). The lower end of the driving column (4) is formed with a truncated cone-shaped tightening top column (41) with a small head facing downward. When the driving column (4) rotates downward in the installation cavity (11), the tightening top column (41) can abut against the inner side surface of the tightening block (3) and push the outer side surface of the tightening block (3) out of the sliding opening (12).

2. The internal expansion positioning pin according to claim 1, characterized in that: A limiting block (31) is formed on the inner side surface of the expansion block (3) so that the cross section of the expansion block (3) is T-shaped.

3. The internal expansion positioning pin according to claim 2, characterized in that: The outer side surface of the expansion block (3) is in an arc shape, and the inner side surface of the expansion block (3) is formed with a first positioning surface (32) matching the driving column (4) and a second positioning surface (33) matching the expansion top column (41) that are connected and distributed up and down.

4. The internal expansion positioning pin according to claim 3, characterized in that: An anti-slip cushion layer (5) is provided on the outer side of the expansion block (3).

5. The internal expansion positioning pin according to claim 4, characterized in that: A plurality of snap-fit ​​grooves (34) are formed on the outer surface of the expansion block (3), and a plurality of snap-fit ​​protrusions (51) matching the snap-fit ​​grooves (34) are formed on the inner surface of the anti-slip pad layer (5). The snap-fit ​​protrusions (51) snap into the snap-fit ​​grooves (34) to achieve a fixed connection between the anti-slip pad layer (5) and the expansion block (3).

6. The internal expansion positioning pin according to claim 1, characterized in that: The mounting cavity (11) passes through the pin body (1) from top to bottom, a limiting ring (13) is formed at the upper end of the pin body (1), and a plurality of swing openings (14) communicating with the mounting cavity (11) are opened at the lower end, and an inverted L-shaped limiting swing arm (6) is rotatably provided at the swing opening (14), a swinging top column (42) is formed at the lower end of the expansion top column (41), and a horizontal flat portion of the limiting swing arm (6) extends into the mounting cavity (11) and is located below the swinging top column (42).

7. The internal expansion positioning pin according to claim 6, characterized in that: The limiting ring (13) is in the shape of a fan ring.

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