CN212351789U

CN212351789U - Sleeve of pre-screwing bolt

Info

Publication number: CN212351789U
Application number: CN202021559477.0U
Authority: CN
Inventors: 张航; 韦成; 梁德昆
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-01-15
Anticipated expiration: 2030-07-31

Abstract

The utility model discloses a sleeve of pre-tightening bolt, including the spanner body, the one end of spanner body is equipped with the head of screwing up, the one end of spanner body is equipped with the encirclement the position sleeve that the head of screwing up set up, be equipped with the constant head tank that the multichannel set up around its central circumference extension on the outer wall of spanner body one end, be equipped with on the inner wall of position sleeve with the spacer pin of position groove looks adaptation, the spacer pin is in can radially stretch out and draw back on the inner wall of position sleeve. The utility model discloses a sleeve of prewirling bolt, structural design is reasonable, belongs to the machinery manufacturing assembly technical field, can solve the problem of prewirling the bolt to a certain specific technological requirement fast, and with low costs, maintain simply; the bolt pre-screwing device can be suitable for pre-screwing bolts with different process requirements, and is wide in application range; the adaptive range can be quickly adjusted according to different target parts.

Description

Sleeve of pre-screwing bolt

Technical Field

The utility model relates to a machine-building assembly technique, more specifically say, it relates to a sleeve of twisting bolt in advance.

Background

When mass producing mechanical products on a production line, it is often necessary to distribute the work steps over several different processes when assembling a part for the purpose of line balancing or for certain specific process requirements. For example, in the production of a certain type of internal combustion engine, when a common rail pipe is assembled, the balance of the overall beat is ensured in order to ensure the assembling quality. The common rail pipe assembling process of a certain type of internal combustion engine requires that a common rail pipe fixing bolt is firstly pre-tightened to a position of 2 mm on a binding surface in the step A, and then the common rail pipe fixing bolt is tightly tightened after a high-pressure oil pipe and the common rail pipe are assembled in the subsequent step B. The loose assembly process ensures that the joint surface of the pipe orifice is better matched when the high-pressure oil pipe and the common rail pipe are assembled, and reduces the occurrence of oil leakage faults. This has led to a technical need for a quick pretensioning of the bolt to a certain extent. However, in the current state of the art, there are no good tools and devices for quickly pre-tightening bolts to the specified degree of technical requirements. Large assembly facilities, if any, that require large capital investments are not the best solution for the enterprise.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to some not enough of the above-mentioned of prior art, the utility model aims at providing a sleeve of twisting bolt in advance with low costs, that maintenance is simple.

In order to realize the above-mentioned purpose, the utility model provides a screw bolt's sleeve in advance, including the spanner body, the one end of spanner body is equipped with the tightening head, the one end of spanner body is equipped with the encirclement the position sleeve that the tightening head set up, be equipped with the constant head tank that the multichannel set up around its central circumferential extension on the outer wall of spanner body one end, be equipped with on the inner wall of position sleeve with the spacer pin of position groove looks adaptation, the spacer pin is in can radially stretch out and draw back on the inner wall of position sleeve.

Furthermore, a sliding hole is formed in the inner wall of the positioning sleeve, and a spring matched with the outer end face of the limiting pin is arranged in the sliding hole.

Furthermore, the slide hole radially extends to the outer wall from the inner wall of the locating sleeve, the inner end of the slide hole is provided with a limiting step, the outer end of the limiting pin is provided with a limiting convex edge matched with the limiting step, and the outer end of the slide hole is provided with a screw cap.

Furthermore, the inner end of the limiting pin is of a round head structure; the inner end of the screw cap is provided with an accommodating groove matched with the spring.

As a further improvement, the tightening head at one end of the wrench body is a wrench sleeve, and the other end of the wrench body is provided with a relay sleeve; the locating slot is arranged on the outer wall of the wrench socket.

Furthermore, the middle of the wrench body is narrowed and arranged to form a dumbbell shape.

Advantageous effects

Compared with the prior art, the utility model discloses a twist telescopic beneficial effect of bolt in advance as follows:

1) the sleeve of the pre-screwing bolt of the utility model can solve the problem of quickly pre-screwing the bolt to a certain specific process requirement, and has low cost and simple maintenance;

2) the utility model discloses a sleeve of pre-screwing bolt, this device can be suitable for the bolt pre-screwing of multiple different technology demands, and application range is wide;

3) the device has strong modularity, and can quickly adjust the adaptive range according to different target parts;

4) the device can quickly realize bolt pre-screwing, is high in efficiency and is suitable for the operation beat of an industrial production line.

Drawings

Fig. 1 is a schematic structural view of a socket of a pre-screwed bolt of the present invention;

FIG. 2 is an enlarged schematic view of the structure of the positioning sleeve of the present invention;

FIG. 3 is an enlarged schematic view of the structure of the middle screw cap of the present invention;

fig. 4 is an enlarged schematic view of the structure of the stop pin of the present invention.

In the figure: 1. a wrench body; 2. tightening a head; 3. a positioning sleeve; 4. positioning a groove; 5. a spacing pin; 6. a slide hole; 7. a spring; 8. a limiting convex edge; 9. a screw cap; 10. accommodating grooves; 11. a relay sleeve; 12. a bolt; 13. and (5) a workpiece.

Detailed Description

The present invention will be further described with reference to the following examples, which are not intended to limit the scope of the present invention, but are intended to be covered by the appended claims in any way.

The specific embodiment of the present invention is such: referring to fig. 1-4, a socket for pre-screwing a bolt comprises a wrench body 1, wherein one end of the wrench body 1 is provided with a tightening head 2, one end of the wrench body 1 is provided with a positioning sleeve 3 surrounding the tightening head 2, the outer wall of one end of the wrench body 1 is provided with a plurality of positioning grooves 4 extending circumferentially around the center of the positioning sleeve, the inner wall of the positioning sleeve 3 is provided with a limit pin 5 matched with the positioning grooves 4, and the limit pin 5 can radially extend and retract on the inner wall of the positioning sleeve 3. The tightening head 2 at one end of the wrench body 1 is a wrench socket which is an inner hexagonal socket, and a plurality of winding positioning grooves 4 are arranged on the outer cylindrical surface of the wrench socket; the other end of the wrench body 1 is provided with a relay sleeve 11, and the relay sleeve 11 is an inner four-corner sleeve; the locating slot 4 is arranged on the outer wall of the wrench socket.

The middle of the wrench body 1 is narrowed, and is dumbbell-shaped, and is a barbell-shaped round rod, the middle of which is small and the two ends of which are large. The middle section of the wrench body 1 is mainly a solid round bar. The inner cavity of the relay sleeve 11 at the upper end of the wrench body 1 is in a concave quadrilateral hollow shape, the outer surface is cylindrical, and the relay sleeve is mainly used for being connected with a tightening tool. The tightening head 2 at the lower end of the wrench body 1 is mainly connected with the assembling bolt, the outer surface of the lower end of the wrench body 1 is cylindrical, but the outer surface of the cylinder is provided with a plurality of locating grooves 4 with semicircular sections for connecting and limiting with the locating sleeve 3. The wrench socket at the lower end of the wrench body 1 is mainly used for screwing the bolt.

In the sleeve of the pre-screwed bolt, a screwing head 2 of a wrench body 1 is axially limited with a positioning sleeve 3 through a limiting pin 5 and a positioning groove 4, and the screwing head 2 and the positioning sleeve 3 can relatively rotate; the distance between the tightening head 2 and the bottom surface of the positioning sleeve 3 is fixed, and when the bolt 12 is tightened by the tightening head 2, the positioning sleeve 3 abuts against the workpiece 13, and the tightening head 2 cannot continue to screw the bolt 12 into the workpiece 13, so that the pre-tightening length of the bolt 12 can be controlled. Therefore, the sleeve of the pre-screwing bolt can solve the problem that the bolt is quickly pre-screwed to the specific process requirement, and is low in cost and simple to maintain.

The axial relative position between the positioning sleeve 3 and the tightening head 2 can be adjusted by means of a plurality of positioning grooves 4, so that the pre-tightening length of the bolt 12 can be adjusted.

In this embodiment, a sliding hole 6 is formed in the inner wall of the positioning sleeve 3, a spring 7 adapted to the outer end surface of the stopper pin 5 is provided in the sliding hole 6, and the stopper pin 5 is radially ejected toward the inner side of the positioning sleeve 3. The stopper pin 5 is always kept in the ejected state by the elastic force of the spring 7. When a certain external force acts on the limit pin 5, the limit pin 5 is compressed towards the radial outer side of the locating sleeve 3. The spring 7 extrudes the limit pin 5 to enable the limit pin 5 to be clamped with the positioning groove 4; moreover, the limit pin 5 can be extended and contracted to facilitate the extraction of the tightening head 2 from the positioning sleeve 3.

In this embodiment, the slide hole 6 radially extends from the inner wall of the positioning sleeve 3 to the outer wall thereof, the inner end of the slide hole 6 is provided with a limiting step, the outer end of the limiting pin 5 is provided with a limiting convex edge 8 adapted to the limiting step, and the outer end of the slide hole 6 is provided with a screw cap 9. The limit pin 5 can be limited to slide in the slide hole 6 through the limit convex edge 8 and the screw cap 9.

In the embodiment, the inner end of the limit pin 5 is of a round head structure; the inner end of the screw cap 9 is provided with an accommodating groove 10 matched with the spring 7.

The concrete during operation: firstly, according to the pre-screwing process requirement of an operation bolt, the positioning sleeve 3 is sleeved into the lower end of the wrench body 1, and according to the pre-screwing gap requirement of different bolts, the positioning sleeve is respectively sleeved on different circular grooves on the outer surface of the lower end of the wrench body 1. The positioning sleeve 3 is sleeved on the wrench body 1 and is mainly clamped through a spring ball type clamping point on the inner surface of the positioning sleeve 3. When no external axial force acts on the positioning sleeve 3, the limiting pin 5 always keeps an ejection state through the elasticity of the spring 7, and the positioning sleeve 3 is clamped and fixed on a circular groove on the outer surface of the wrench body 1. When the positioning sleeve 3 needs to be replaced or the bolt screwing clearance perhaps needs to be adjusted, only the positioning sleeve 3 needs to be pulled out forcibly, the positioning sleeve 3 moves outwards under the action of radial force, the limiting pin 5 can be pressed down, and the positioning sleeve 3 can be pulled out.

When the device is used for screwing the bolt 12, the bolt can be screwed in at a certain distance from the binding surface, and as shown in figure 1, the distance from the flange surface of the bolt to the surface of a workpiece is h.

N positioning sleeves 3 with different specifications can be prepared for use according to different bolt pre-screwing process requirements. Simultaneously, the outer surface of the lower end of the wrench body 1 is also provided with N different circular grooves to adapt to different pre-screwing distances.

The above is only a preferred embodiment of the present invention, and it should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which will not affect the utility of the invention and the utility of the patent.

Claims

1. The utility model provides a socket of wrong bolt in advance, includes spanner body (1), its characterized in that, the one end of spanner body (1) is equipped with tightening head (2), the one end of spanner body (1) is equipped with surrounds tightening head (2) locating sleeve (3) that set up, be equipped with on the outer wall of spanner body (1) one end the multichannel around its central circumference constant head tank (4) that extend the setting, be equipped with on the inner wall of locating sleeve (3) with spacer pin (5) of constant head tank (4) looks adaptation, spacer pin (5) are in can radially stretch out and draw back on the inner wall of locating sleeve (3).

2. The socket for the pre-screwed bolt according to claim 1, characterized in that a sliding hole (6) is formed in the inner wall of the locating sleeve (3), and a spring (7) adapted to the outer end face of the limit pin (5) is arranged in the sliding hole (6).

3. The socket for the pre-screwed bolt according to claim 2, characterized in that the slide hole (6) extends from the inner wall of the locating sleeve (3) to the outer wall thereof in the radial direction, the inner end of the slide hole (6) is provided with a limiting step, the outer end of the limiting pin (5) is provided with a limiting convex edge (8) corresponding to the limiting step, and the outer end of the slide hole (6) is provided with a screw cap (9).

4. A socket for a pre-screwed bolt according to claim 3, characterized in that the inner end of the stopper pin (5) has a round head structure; the inner end of the screw cap (9) is provided with an accommodating groove (10) matched with the spring (7).

5. A socket for a pre-screwed bolt according to any one of claims 1 to 4, wherein the tightening head (2) at one end of the wrench body (1) is a wrench socket, and the other end of the wrench body (1) is provided with a relay socket (11); the positioning groove (4) is formed in the outer wall of the wrench socket.

6. A socket for a pre-screwed bolt according to claim 5, wherein the wrench body (1) is narrowed in the middle and has a dumbbell shape.