CN223690151U - Fixing bolt - Google Patents

Abstract

The utility model relates to the technical field of mechanical parts, in particular to a fixing bolt which comprises a locking structure and a head part fixedly arranged at the top end of the locking structure, wherein the locking structure comprises a central core with the head part fixedly arranged at the top end and an expansion sleeve fixedly arranged on the outer wall of the bottom of the central core.

Description

Fixing bolt

Technical Field

The utility model relates to the technical field of mechanical parts, in particular to a fixing bolt.

Background

The bolt is a mechanical connecting piece, belongs to a standardized fastening piece, and consists of a head part and a screw rod (a cylinder with external threads), and is usually matched with a nut for use, and is used for connecting two parts with through holes, the screw rod of the bolt is mostly cylindrical, plays a guiding role, bears shearing force when matched with the hole, is provided with threads, is in charge of being matched with the nut or the threaded hole, the head forms of the bolts are various, and the bolts are commonly provided with a hexagon head, a round head, a countersunk head and the like, and the bolts are used for applying reverse torque in cooperation with a tool (such as a spanner), so that the fastening force of the nuts is ensured, and the stress is dispersed when the bolts are pulled, so that workpieces can be quickly connected through the cooperation of the bolts with threaded holes or the nuts, and the bolts are convenient to use and widely applied to various fields.

Although the prior art can solve the corresponding technical problems, certain defects still exist that the bolt is installed in a workpiece, the process of the workpiece is poor or the top of a threaded hole is worn and damaged, the top part of the threaded hole is outwards expanded, the whole threaded hole is in an irregular conical state, the bottom can be normally matched with the bolt, further, after the bolt is screwed in, the top part of the bolt is easily loosened, further, the fixing effect of the bolt is poor, and the bolt is easily dropped.

Disclosure of utility model

The utility model aims to provide a fixing bolt with strong adaptability and firm connection aiming at the defects and the shortcomings of the prior art.

The fixing bolt comprises a locking structure and a head part fixedly arranged at the top end of the locking structure, wherein the locking structure comprises a middle core with the head part fixedly arranged at the top end and an expansion sleeve fixedly arranged on the outer wall of the bottom of the middle core.

The improvement is that a positioning block is also arranged at the bottom of the middle core.

The expansion sleeve is further improved in that the expansion sleeve comprises an expansion sleeve body fixedly arranged at the bottom of the center and expanding outwards from bottom to top, and a deformation inner cavity formed in the expansion sleeve body, and the outer wall of the expansion sleeve body is integrally formed with external threads.

The expansion sleeve is further improved in that the expansion sleeve body is integrally formed with a plurality of V-shaped deformation grooves.

The head comprises a head body and a cladding block arranged below the head body, wherein the cladding block is of a hollow structure, and an opening groove through which a central core can pass is integrally formed at the bottom of the cladding block.

The improvement is that the cladding block is integrally provided with an inverted V-shaped compression groove.

After the technical scheme is adopted, when the expansion sleeve is screwed into the threaded hole, if the threaded hole is in an irregular conical state, the expansion sleeve can be attached to the inner wall of the threaded hole in the screwing process, and the expansion sleeve body is pressed to shrink under the extrusion action of the inner wall of the threaded hole, so that the expansion sleeve body is attached to the inner wall of the threaded hole, and the external thread is meshed with the internal thread of the inner wall of the threaded hole more, so that the connection firmness is greatly improved, and the bolt is not easy to fall off.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic view in elevation of a fixing bolt of the present utility model;

FIG. 2 is a schematic elevational view in cross-section of the expansion shell of the present utility model;

Fig. 3 is a schematic view of the head of the present utility model in elevation and cross section.

Detailed Description

The utility model will now be further described with reference to the drawings and specific examples.

Referring to fig. 1-3, the technical scheme adopted in the specific embodiment is as follows: the fixing bolt comprises a locking structure and a head 3 fixedly arranged at the top end of the locking structure, the head 3 comprises a head body 31 and a cladding block 32 arranged below the head body 31, the cladding block 32 is of a hollow structure, an opening groove allowing a middle core 1 to pass through is integrally formed at the bottom of the cladding block, the locking structure comprises the middle core 1 with the head 3 fixedly arranged at the top end and an expansion sleeve 2 fixedly arranged on the outer wall of the bottom of the middle core 1, the expansion sleeve 2 comprises an expansion sleeve body 21 fixedly arranged at the bottom of the center 1 and expanding outwards from bottom to top and a deformation inner cavity 22 formed in the expansion sleeve body 21, the outer wall of the expansion sleeve body 21 is integrally formed with an external thread 23, compared with a common bolt, the bolt has longer length and more screwing-in space for a threaded hole to extrude the expansion sleeve 2, when in use, the locking structure is aligned with the threaded hole, the head body 31 of the head 3 is screwed, the expansion sleeve 2 with the middle core 1 is screwed into the threaded hole, at the moment, if the threaded hole is in an irregular conical state, the expansion sleeve 2 can be attached to the inner wall of the threaded hole in the screwing process, and is extruded by the inner wall of the threaded hole in the screwing process, under the extrusion action, the expansion sleeve body 21 is pressed to shrink, the expansion sleeve body 21 is deformed into the shape with the same gradient as the inner wall of the threaded hole, and is attached to the inner wall of the threaded hole, thereby the external thread 23 is meshed with the internal thread of the inner wall of the threaded hole, the connection firmness is greatly improved, the bolt is not easy to fall off when being screwed into the bottom end, at this time, the head 3 can be attached to the surface of the workpiece, and the cladding block 32 can be inserted into the top of the threaded hole at this time and is extruded and deformed along with the screwing of the bolt, so that the top of the threaded hole is fully filled with the cladding block 32, and the connection firmness of the bolt is further improved;

the bottom of the middle core 1 is also provided with the positioning block 4, so that when a bolt is to be screwed in, the positioning block is more convenient to align with a threaded hole on a workpiece, and when the bottom end contacts the threaded hole through the round table-shaped structure of the positioning block, the positioning block can slide along the outer wall of the positioning block so as to accurately position the alignment bolt and the threaded hole;

The expansion sleeve body 21 is integrally formed with a plurality of V-shaped deformation grooves 24, which is beneficial to the expansion sleeve body 21 to be deformed more easily, so that the resistance during screwing is reduced, and the screwing is smoother;

The inverted V-shaped compression groove 33 is integrally formed on the cladding block 32, so that the cladding block 32 can deform at the position of the compression groove 33, the force required by screwing in the rear section is lower, and the screwing in is simpler and more labor-saving.

The utility model adopts the working principle that when the utility model is used, a locking structure is aligned with a threaded hole, and the head body 31 of the head 3 is screwed, so that the expansion sleeve 2 with the locking structure and the central core 1 are screwed into the threaded hole, at the moment, if the threaded hole is in an irregular conical state, the expansion sleeve 2 can be jointed with the inner wall of the threaded hole in the screwing process, and the expansion sleeve body 21 is pressed and contracted by the inner wall of the threaded hole in the screwing process, under the extrusion action, the expansion sleeve body 21 is deformed into the shape with the same gradient as the inner wall of the threaded hole, and is jointed with the inner wall of the threaded hole, thereby the external thread 23 is meshed with the internal thread of the inner wall of the threaded hole, the connection firmness is greatly improved, the bolt is more difficult to fall off, at the moment, the head 3 is jointed with the surface of a workpiece, at the moment, the coating block 32 is also put into the top of the threaded hole, and the coating block 32 is extruded and deformed along with the screwing of the bolt, thereby the top of the bolt is fully filled, and the connection firmness is further improved.

The utility model is to protect the structure of the product, the model of each element is not the content protected by the utility model, and the utility model is also known technology, and only the element capable of realizing the functions can be used as an option in the market. Therefore, parameters such as the type of the element will not be described in detail in the present utility model. The utility model is contributed to scientifically combining the elements together.

While the basic principles and main features of the present utility model and advantages thereof have been shown and described, it will be understood by those skilled in the art that the present utility model is not limited by the foregoing embodiments, which are described merely by way of illustration of the principles of the present utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model as defined in the appended claims and their equivalents. The present utility model is not described in detail in the present application, and is well known to those skilled in the art.

Claims (6)

1. The fixing bolt is characterized by comprising a locking structure and a head (3) fixedly arranged at the top end of the locking structure, wherein the locking structure comprises a middle core (1) with the head (3) fixedly arranged at the top end and an expansion sleeve (2) fixedly arranged on the outer wall of the bottom of the middle core (1).

2. The fixing bolt according to claim 1, wherein the bottom of the center core (1) is further provided with a positioning block (4).

3. The fixing bolt according to claim 1, wherein the expansion sleeve (2) comprises an expansion sleeve body (21) fixedly arranged at the bottom of the central core (1) and expanding outwards from bottom to top, and a deformation inner cavity (22) formed in the expansion sleeve body (21), and external threads (23) are integrally formed on the outer wall of the expansion sleeve body (21).

4. A fixing bolt according to claim 3, wherein the expansion sleeve body (21) is integrally formed with a plurality of V-shaped deformation grooves (24).

5. The fixing bolt according to claim 1, wherein the head (3) comprises a head body (31) and a cladding block (32) arranged below the head body (31), the cladding block (32) is of a hollow structure, and an open slot through which the central core (1) can pass is integrally formed at the bottom.

6. A fixing bolt according to claim 5, wherein the covering block (32) is integrally formed with an inverted V-shaped compression groove (33).