CN115095589A

CN115095589A - Connecting pin

Info

Publication number: CN115095589A
Application number: CN202210711535.4A
Authority: CN
Inventors: 唐永斌; 刘晓薇; 张丽宏; 谭全洲; 宁浩
Original assignee: Sichuan Aerospace Changzheng Equipment Manufacturing Co Ltd
Current assignee: Sichuan Aerospace Changzheng Equipment Manufacturing Co Ltd
Priority date: 2022-06-22
Filing date: 2022-06-22
Publication date: 2022-09-23
Anticipated expiration: 2042-06-22
Also published as: CN115095589B

Abstract

The invention discloses a connecting pin which comprises a pin shell, a screw rod, a nut, a conical ring, a steel ball and a spring, wherein the nut is sleeved at the large end of the pin shell, a check ring is arranged between the nut and the pin shell, the small end of the pin shell is sequentially connected with the spring, the conical ring b, the steel ball, the conical ring a, the screw rod and a blocking plate, one end of the spring is abutted against the inner plane of the pin shell, and the other end of the spring is abutted against the conical ring b; the conical ring a and the conical ring b are assembled in a back-to-back manner, a steel ball is arranged between the conical ring a and the conical ring b, and the steel ball is arranged in the spiral groove of the pin shell; the screw thread end of the screw rod is screwed into the nut, a flat key is arranged in the key groove at the head part of the screw rod, and the flat key is arranged in the key groove of the pin shell. The nut connecting device realizes that the positioning and the connection of the connected piece can be completed by one-end screwing operation, has compact structure, simple and convenient operation and stable and reliable function, and is particularly suitable for occasions with narrow operation space and difficult or impossible screwing of the nut.

Description

Connecting pin

Technical Field

The invention belongs to the field of machining and relates to a connecting pin.

Background

The bolt connection is simple in structure, low in cost, convenient to install, free of limitation of connecting piece materials in use and wide in application, and is generally used for occasions where the thickness of a connected piece is small or the connected piece can be installed from two sides. The bolt connection is usually composed of fasteners such as a bolt, a flat pad, an elastic pad, a nut and the like, and is tightened by a wrench when in use.

The connecting pin is similar to a bolt for reaming holes, has the pin positioning function besides the connecting function of a common bolt, and is common in nonstandard design due to simple structure and easy manufacture. For some working conditions with narrow operating space, the nut at the tail end of the common connecting pin is difficult to screw down by using a conventional tool, and sometimes even cannot be operated. To solve the problem, the most convenient method is to manufacture a screw hole with a positioning step on one of the connected pieces, but the processing difficulty is undoubtedly increased, the position precision of the hole is more difficult to ensure during porous connection, and the process difficulty and the manufacturing cost are greatly increased. In addition, if the thickness of the connected piece is not enough, the screw hole with the positioning step cannot be arranged.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a connecting pin which can be operated on one side and solves the problem that a nut is difficult to screw in narrow operating space occasions.

In order to achieve the purpose, the invention adopts the following technical scheme:

a connecting pin comprises a pin shell, a screw rod, a nut, a conical ring, a steel ball and a spring, wherein the nut is sleeved at the large end of the pin shell, a check ring is arranged between the nut and the pin shell, the small end of the pin shell is sequentially connected with the spring, the conical ring b, the steel ball, the conical ring a, the screw rod and a blocking plate, one end of the spring is abutted to the inner plane of the pin shell, and the other end of the spring is abutted to the conical ring b; the conical ring a and the conical ring b are assembled in a back-to-back manner, a steel ball is arranged between the conical ring a and the conical ring b, and the steel ball is arranged in the spiral groove of the pin shell; the screw thread end of the screw rod is screwed into the nut, a flat key is arranged in the key groove at the head part of the screw rod, and the flat key is arranged in the key groove of the pin shell.

Preferably, the outer circle of the large end of the pin shell is provided with knurls for holding.

Preferably, the excircle of the large end of the pin shell is provided with a square flat potential and a small hole for a wrench or a steel bar to screw.

As a preferable mode, the middle part of the pin shell is provided with a spiral groove, and the cross section of the spiral groove is matched with the steel ball in size.

As a preferable mode, a chamfer is arranged in the pin shell, the chamfer gradually transits from small to large from the small end to the large end of the pin shell, and the steel ball automatically retracts along the radial direction during loosening operation so as to facilitate the insertion and the extraction of the connecting pin.

Preferably, the inner hole of the large end of the pin shell is matched with the shaft shoulder of the nut.

Preferably, the inner diameter of the small end of the pin shell is matched with the outer diameter of the conical ring.

Preferably, the retainer ring is arranged in a groove in the large end of the pin shell.

Preferably, the blocking plate is connected with the inner threads of the small end of the pin shell.

Preferably, a key groove is further formed in the pin housing to prevent the screw from rotating.

When the nut is screwed, the screw rod can be driven to move towards the large end to further push the conical ring a, meanwhile, under the action of the rebounding force of the spring, the conical ring b moves reversely, so that the steel ball clamped between the conical rings a and b is ejected outwards along the radial direction, and slides towards the large end along the spiral groove on the pin shell along with the continuous movement of the screw rod until the steel ball is abutted against the end face of the connected piece at the small end. When the connecting piece is loosened, the nut is reversely screwed, the steel ball slides back to the small end along the spiral groove of the pin shell, and the connecting pin can be pulled out after enough clearance, so that the connecting piece can be screwed down only on one side.

The invention has the following advantages:

the nut connecting device has the advantages that the positioning and the connection of the connected piece can be completed by one-end screwing operation, the structure is compact, the operation is simple and convenient, the function is stable and reliable, and the nut connecting device is particularly suitable for occasions with narrow operation space and difficult or impossible screwing of nuts.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 in the direction K;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a cross-sectional view B-B of FIG. 1;

FIG. 5 is a perspective view of the present invention;

FIG. 6 is a schematic view of a nut;

FIG. 7 is a schematic view of a pin housing construction;

FIG. 8 is a key slot structure;

FIG. 9 is a schematic view of a screw structure;

FIG. 10 is a schematic view of a closure plate configuration;

fig. 11 is a schematic view of a cone ring structure.

In the figure: 1-nut, 2-pin shell, 3-screw, 4-steel ball, 5-blocking plate, 6 a-conical ring a, 6 b-conical ring b, 7-spring, 8-check ring, 9-flat key, 10-square flat potential, 11-knurling, 12-spiral groove and 13-keyway.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example (b):

a connecting pin is positioned by utilizing a shaft shoulder, a nut 1 is sleeved in a pin shell 2, and a retainer ring 8 is arranged outside the pin shell 2 to prevent the nut from being separated. The small end of the pin shell is sequentially provided with a spring 7, a conical ring b6b, a steel ball 4, a conical ring a6a and a screw 3, and finally screwed into the blocking plate 5 for limiting. One end of the spring 7 is abutted against the inner plane of the pin housing, and the other end is abutted against the conical ring b6 b. The conical rings a6a and b6b are assembled in a back-to-back manner, 4 steel balls 4 are arranged between conical surfaces of the two conical rings, and the steel balls 4 are also respectively embedded into the spiral grooves 12 of the pin shell 2. The threaded end of the screw 3 is screwed into the nut 1, and the flat key 9 is arranged in the key groove 13 at the head part of the pin shell 2 and is clamped into the key groove 13 of the pin shell, so that the screw 3 can only translate and not rotate when working.

The pin shell 2 is used as a base body, the outer circle of the head part is knurled 11 so as to be held, and simultaneously, a square flat potential 10 and a small hole are formed for a wrench or a steel bar to be screwed. A guide oblique angle is formed at the front section of the pin positioning section, 4 spiral grooves 12 are uniformly distributed in the middle of the pin positioning section along the periphery of the pin positioning section, the cross section of each spiral groove is matched with the steel ball in size, a chamfer is formed by the position close to the inner part, and the width of the position close to the outer part needs to ensure that the steel ball does not separate when being protruded. The chamfer angle close to the inner part is gradually transited from small to large from the far end to the near end of the pin shell 2, and the main purpose is to ensure that the steel ball 4 automatically retracts along the radial direction during the loosening operation so as to be convenient for the insertion and the extraction of the connecting pin. The inner hole of the large end of the pin shell 2 is matched with the shaft shoulder of the nut 1, the inner diameter of the small end is matched with the outer diameter of the conical ring, a groove for installing the check ring 8 is further formed in the inner part of the large end, and an inner thread for installing the blocking plate 5 is formed in the inner part of the small end.

When the connecting pin is in work, the connecting pin is inserted into a pin hole of a connected piece, the large end of the pin shell 2 is held manually or the pin shell 2 is ensured to be not rotated by using a wrench, a steel bar and the like, the screw rod 3 can be driven to move towards the near end by screwing the nut 1, so that the conical ring a6a is further pushed, meanwhile, the other conical ring b6b moves in the reverse direction under the action of the rebounding force of the spring 7, and thus, the steel ball 4 clamped between the conical rings a6a and b6b is pushed out outwards along the conical surfaces of the two conical rings, and as the screw rod 3 continues to move, the steel ball 4 also slides towards the near end along the spiral groove 12 on the pin shell 2 until the steel ball is tightly abutted against the end surface of the connected piece at the far end. When the connecting pin is loosened, the nut 1 is reversely screwed, the screw rod 3 withdraws towards the far end, then the spring 7 pushes the conical ring to move backwards, the steel ball 4 slides back towards the far end along the spiral groove 12 of the pin shell 2, and the connecting pin can be integrally pulled out after the gap is enough.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.

Claims

1. A connecting pin, characterized by: the novel pin comprises a pin shell, a screw rod, a nut, a conical ring, a steel ball and a spring, wherein the nut is sleeved at the large end of the pin shell, a check ring is arranged between the nut and the pin shell, the small end of the pin shell is sequentially connected with the spring, the conical ring b, the steel ball, the conical ring a, the screw rod and a blocking plate, one end of the spring is abutted against the inner plane of the pin shell, and the other end of the spring is abutted against the conical ring b; the conical ring a and the conical ring b are assembled in a back-to-back manner, a steel ball is arranged between the conical ring a and the conical ring b, and the steel ball is arranged in the spiral groove of the pin shell; the screw thread end of the screw rod is screwed into the nut, a flat key is arranged in the key groove at the head part of the screw rod, and the flat key is arranged in the key groove of the pin shell.

2. A connecting pin according to claim 1, wherein: and a knurling is arranged on the outer circle of the large end of the pin shell.

3. A connecting pin according to claim 1, wherein: the excircle of the big end of the pin shell is provided with a square flat potential and a small hole.

4. A connecting pin according to claim 1, wherein: the middle part of the pin shell is provided with a spiral groove, and the cross section of the spiral groove is matched with the steel ball in size.

5. A connecting pin according to claim 1, wherein: a chamfer is arranged in the pin shell and gradually transits from small to large from the small end to the large end of the pin shell.

6. A connecting pin according to claim 1, wherein: and the inner hole of the large end of the pin shell is matched with the shaft shoulder of the nut.

7. A connecting pin according to claim 1, wherein: the inner diameter of the small end of the pin shell is matched with the outer diameter of the conical ring.

8. A connecting pin according to claim 1, wherein: the check ring is arranged in the groove in the large end of the pin shell.

9. A connecting pin according to claim 1, wherein: the blocking plate is connected with the internal thread inside the small end of the pin shell.

10. A connecting pin according to claim 1, wherein: the pin shell is internally provided with a key slot.