Pneumatic expanding positioning pin

Abstract

The utility model discloses a pneumatic expanding positioning pin which comprises a pin body assembly, a steel ball, a guide assembly and a piston assembly, the steel ball is connected in a spherical groove in a sleeved mode, a bottom notch is formed in the bottom of a main rod body, and a guide sleeve in the guide assembly is connected in the bottom notch in a sleeved mode. The whole structure of the positioning pin is composed of the main rod body, the guide sleeve and the piston rod, the bottom notch formed in the bottom of the main rod body supports the guide sleeve, a sliding cavity is provided for the piston rod through the piston groove after the guide sleeve is connected in a sleeved mode, and the whole positioning pin is simple in structure, convenient to replace accessories and simple in overhaul and maintenance process. The practicability of the product is improved; the first O-shaped ring is arranged on the outer wall of the guide sleeve, the second O-shaped ring is arranged on the piston rod to be connected with the sealing rings in a sleeved mode, the sealing rings on the first O-shaped ring and the second O-shaped ring form a double-layer closed structure of the positioning pin in the working process, the sealing effect is guaranteed, gas leakage is prevented, and then the diameter expanding precision of the positioning pin is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic positioning pins, and particularly relates to a pneumatic diameter-expanding positioning pin. Background Technique

[0002] The pneumatic diameter-expanding positioning pin is a positioning pin with special functions. It realizes the function of diameter expansion and contraction through pneumatic control to achieve the purpose of high-precision positioning. During the use process, the diameter of the positioning pin can be adjusted according to needs to match the reference holes of workpieces with different sizes. In the diameter-expanded state, the gap between the positioning pin and the reference hole of the workpiece is zero, realizing high-precision positioning. This gapless positioning method helps to improve the machining accuracy and stability of the workpiece. At the same time, the pneumatic diameter-expanding positioning pin can shorten the clamping time and reduce the production cost. When the workpiece is moved in and out, the positioning pin can be reduced in diameter to provide sufficient clearance for the replacement and handling of the workpiece, thus improving the production efficiency. The existing pneumatic diameter-expanding positioning pins can basically meet the daily use requirements, but the overall structure of the positioning pin is complex, and the overhaul and maintenance process is cumbersome, which affects the practicability of the product. At the same time, the sealing structure of the positioning pin is simple, which affects the diameter-expanding accuracy of the positioning pin during use. Therefore, it is very necessary to design a pneumatic diameter-expanding positioning pin. Content of the Utility Model

[0003] The purpose of the utility model is to provide a pneumatic diameter-expanding positioning pin to solve the problems that the overall structure of the existing positioning pin is complex, the overhaul and maintenance process is cumbersome, which affects the practicability of the product, and at the same time, the sealing structure of the positioning pin is simple, which affects the diameter-expanding accuracy of the positioning pin during use.

[0004] To solve the above technical problems, the utility model provides the following technical solution: A pneumatic diameter-expanding positioning pin, comprising a pin body assembly, steel balls, a guiding assembly and a piston assembly. The pin body assembly consists of a main rod body, spherical grooves, side sealing frames, side groove holes and a bottom groove opening. Spherical grooves are symmetrically opened at the top of the main rod body, and steel balls are sleeved in the spherical grooves. A bottom groove opening is opened at the bottom of the main rod body, and a guiding sleeve in the guiding assembly is sleeved in the bottom groove opening. A piston groove is opened in the guiding sleeve, and a piston rod in the piston assembly is slidably connected in the piston groove.

[0005] As a further technical solution of the utility model, side sealing frames are symmetrically arranged on both sides of the main rod body, and side groove holes are opened on the side sealing frames.

[0006] As a further technical solution of the utility model, the guiding assembly consists of a guiding sleeve, a piston groove and a first O-ring. A first O-ring is opened on the side wall of the guiding sleeve.

[0007] As a further technical solution of the utility model, the piston assembly consists of a piston rod, a limiting groove, a limiting pin, a second O-ring, a top rod, a bottom limit and an annular groove. A top rod is arranged at the top of the piston rod.

[0008] As a further technical solution of the present utility model, a bottom limit is provided at the bottom of the piston rod, and an annular groove is formed on the side wall of the bottom limit.

[0009] As a further technical solution of the present utility model, a second O-ring is formed at the bottom of the piston rod.

[0010] As a further technical solution of the present utility model, a limit groove is formed at the top of the piston rod, and a limit pin is sleeved in the limit groove in a matching manner.

[0011] An pneumatic expanding positioning pin provided by the present utility model has the following advantages: the overall structure of the positioning pin is composed of a main rod body, a guide sleeve and a piston rod. The bottom notch formed at the bottom of the main rod body provides support for the guide sleeve, and after the guide sleeve is sleeved, a sliding cavity is provided for the piston rod through the piston groove. The structure of the whole positioning pin is simple, which is convenient for replacing accessories, and the maintenance process is simple, improving the practicability of the product; by forming a first O-ring on the outer wall of the guide sleeve and a second O-ring on the piston rod to sleeve the sealing ring, the sealing rings on the first O-ring and the second O-ring form a double-layer sealing structure of the positioning pin during the working process, ensuring the sealing effect and preventing gas leakage, thereby improving the expanding accuracy of the positioning pin. Description of the Drawings

[0012] 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 the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 It is a schematic diagram of a partial structure of the present utility model;

[0015] Figure 3 It is a sectional view of the guide sleeve in the present utility model;

[0016] Figure 4 It is a sectional view of the main rod body in the present utility model;

[0017] Figure 5 It is a top view of the overall structure of the present utility model.

[0018] In the figure: 1. Pin body assembly; 2. Steel ball; 3. Guide assembly; 4. Piston assembly; 10. Main rod body; 11. Spherical groove; 12. Side seal frame; 13. Side slot hole; 14. Bottom slot opening; 31. Guide sleeve; 32. Piston groove; 33. First O-ring; 41. Piston rod; 42. Limit groove; 43. Limit pin; 44. Second O-ring; 45. Top rod; 46. Bottom limit; 47. Annular groove. Detailed implementation manner

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0021] Please refer to the attached Figure 1 - attached Figure 5, an embodiment provided by the present utility model: a pneumatic diameter-expanding positioning pin, which includes a pin body assembly 1, steel balls 2, a guiding assembly 3, and a piston assembly 4. The pin body assembly 1 is composed of a main rod body 10, spherical grooves 11, side sealing frames 12, side slot holes 13, and a bottom slot opening 14. Spherical grooves 11 are symmetrically opened at the top of the main rod body 10, and steel balls 2 are sleeved in the spherical grooves 11. A bottom slot opening 14 is opened at the bottom of the main rod body 10, and a guiding sleeve 31 in the guiding assembly 3 is sleeved in the bottom slot opening 14. A piston slot 32 is opened in the guiding sleeve 31, and a piston rod 41 in the piston assembly 4 is slidably connected in the piston slot 32; side sealing frames 12 are symmetrically arranged on both sides of the main rod body 10, and side slot holes 13 are opened in the side sealing frames 12; the guiding assembly 3 is composed of a guiding sleeve 31, a piston slot 32, and a first O-ring 33. A first O-ring 33 is opened on the side wall of the guiding sleeve 31. The piston assembly 4 is composed of a piston rod 41, a limiting slot 42, a limiting pin 43, a second O-ring 44, a top rod 45, a bottom limit 46, and an annular groove 47. A top rod 45 is arranged at the top of the piston rod 41, a bottom limit 46 is arranged at the bottom of the piston rod 41, and an annular groove 47 is opened on the side wall of the bottom limit 46. A second O-ring 44 is opened at the bottom of the piston rod 41, a limiting slot 42 is opened at the top of the piston rod 41, and a limiting pin 43 is fitted and sleeved in the limiting slot 42. The limiting slot 42 is used for sleeving the limiting pin 43, and thus the piston rod 41 is limited by the limiting pin 43;

[0022] Specifically, during use, the overall structure of the positioning pin is composed of the main rod body 10, the guiding sleeve 31, and the piston rod 41. The bottom slot opening 14 opened at the bottom of the main rod body 10 provides support for the guiding sleeve 31, and after sleeving the guiding sleeve 31, a sliding cavity is provided for the piston rod 41 through the piston slot 32. The structure of the entire positioning pin is simple, which is convenient for replacing accessories, and the maintenance process is simple, improving the practicability of the product; by opening a first O-ring 33 on the outer wall of the guiding sleeve 31 and opening a second O-ring 44 on the piston rod 41 to sleeve the sealing ring, the sealing rings on the first O-ring 33 and the second O-ring 44 form a double-layer sealed structure of the positioning pin during the working process, ensuring the sealing effect and preventing gas leakage, and thus improving the diameter-expanding accuracy of the positioning pin.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0024] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or equivalently replace some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pneumatically expanded diameter positioning pin, comprising a pin body assembly (1), a steel ball (2), a guide assembly (3) and a piston assembly (4), characterized in that: The pin body assembly (1) is composed of a main rod body (10), a spherical groove (11), a side sealing frame (12), a side groove hole (13) and a bottom groove (14); the top of the main rod body (10) is symmetrically provided with a spherical groove (11), and a steel ball (2) is sleeved in the spherical groove (11); the bottom of the main rod body (10) is provided with a bottom groove (14), and a guide sleeve (31) in a guide assembly (3) is sleeved in the bottom groove (14); a piston groove (32) is provided in the guide sleeve (31), and a piston rod (41) in a piston assembly (4) is slidably connected in the piston groove (32).

2. A pneumatically expanded diameter positioning pin according to claim 1, characterized in that: Side sealing frames (12) are symmetrically arranged on both sides of the main rod body (10), and side slot holes (13) are opened on the side sealing frames (12).

3. A pneumatically expanded diameter positioning pin according to claim 1, characterized in that: The guide assembly (3) is composed of a guide sleeve (31), a piston groove (32) and a first O-ring (33). The first O-ring (33) is provided on the side wall of the guide sleeve (31).

4. A pneumatically expanded diameter positioning pin according to claim 1, characterized in that: The piston assembly (4) is composed of a piston rod (41), a limiting groove (42), a limiting pin (43), a second O-ring (44), a top rod (45), a bottom limiting groove (46) and an annular groove (47), and a top rod (45) is arranged at the top of the piston rod (41).

5. A pneumatically expanded diameter positioning pin according to claim 4, characterized in that: A bottom limiter (46) is provided at the bottom of the piston rod (41), and an annular groove (47) is provided on the side wall of the bottom limiter (46).

6. A pneumatically expanded diameter positioning pin according to claim 5, characterized in that: A second O-ring (44) is provided at the bottom of the piston rod (41).

7. A pneumatically expanded diameter positioning pin according to claim 6, characterized in that: A limiting groove (42) is provided on the top of the piston rod (41), and a limiting pin (43) is sleeved in the limiting groove (42).

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