Fixing bolt

Abstract

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

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical parts technical field, concretely relates to a fixed bolt. BACKGROUND

[0002] Bolt is a kind of mechanical connecting piece, belongs to the fastener of standardization, is composed of head and screw rod (cylinder with external thread), usually needs to be used with nut, is used to connect two parts with through hole, the screw rod of bolt is mostly cylindrical, plays the role of guiding, is matched with hole to bear shearing force, it is equipped with thread on it, is responsible for the cooperation with nut or threaded hole, the head form of bolt is various, commonly known hexagonal head, round head, countersunk head etc., its role is to cooperate with tool (such as spanner) and exert reverse torque, ensure the fastening force of nut, and disperse stress when under tension, threaded hole or nut can be connected with workpiece quickly by bolt, it is convenient to use, and is widely used in various fields.

[0003] Although the above prior art can solve the corresponding technical problems, there are still some defects: the workpiece is installed into the bolt, some workpieces are poor in process or the top of threaded hole is damaged, the top of threaded hole is expanded, the entire threaded hole presents irregular conical state, and the bottom can be normally matched with the bolt, so that the top part of the bolt is easily loosened after the bolt is screwed in, and the fixing effect of the bolt is poor, which is prone to falling off. UTILITY MODEL CONTENTS

[0004] The utility model aims at the defects and deficiencies of prior art, and provides a fixed bolt with high adaptability and firm connection.

[0005] To achieve the above object, the utility model adopts the following technical scheme: a fixed bolt, including locking structure and head portion fixedly arranged at the top end of the locking structure, the locking structure includes the middle core with the head portion fixedly installed at the top end and the expansion sleeve fixedly arranged at the outer wall of the bottom of the middle core.

[0006] Further improvement is that the bottom of the middle core is further provided with a positioning block.

[0007] Further improvement is that the expansion sleeve includes the expansion sleeve body fixedly arranged at the bottom of the center and expanding from bottom to top and outward, and the deformed inner cavity formed in the expansion sleeve body, and the outer thread is integrally formed on the outer wall of the expansion sleeve body.

[0008] Further improvement is that a plurality of V-shaped deformation grooves are integrally formed on the expansion sleeve body.

[0009] Further improvement is that the head portion includes the head body and the cladding block arranged below the head body, the cladding block is a hollow structure and is integrally formed with the opening slot allowing the middle core to pass through at the bottom.

[0010] Further improvement is that the covering block is integrally formed with a reverse V-shaped compression groove.

[0011] After the technical scheme is applied, the utility model has the beneficial effects that when the utility model is screwed into the threaded hole, if the threaded hole presents an irregular conical state, then during the screwing process, the expansion sleeve can be attached to the inner wall of the threaded hole, and under the extrusion of the inner wall of the threaded hole, the expansion sleeve body is pressed to shrink, and then the expansion sleeve body is attached to the inner wall of the threaded hole, so that the external thread is more engaged with the internal thread of the inner wall of the threaded hole, thereby greatly improving the firmness of the connection, and the bolt is more difficult to fall off. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0013] Fig. 1 It is the structure schematic diagram of the fixed bolt front view section of the utility model;

[0014] Fig. 2 It is the structure schematic diagram of the expansion sleeve front view section of the utility model;

[0015] Fig. 3 It is the structure schematic diagram of the head front view section of the utility model. DETAILED DESCRIPTION

[0016] The utility model will be further explained in combination with the drawings and specific embodiments.

[0017] Referring to Figs. 1-3The technical scheme adopted in the embodiment is shown as follows: a fixing bolt, comprising a locking structure and a head 3 fixedly arranged at the top end of the locking structure, the head 3 comprising a head body 31 and a cladding block 32 arranged below the head body 31, the cladding block 32 being a hollow structure and integrally formed with an open slot at the bottom for the middle core 1 to pass through, the locking structure comprising the middle core 1 with the head 3 fixedly installed at the top end and an expansion sleeve 2 fixedly arranged at the outer wall of the bottom of the middle core 1, the expansion sleeve 2 comprising an expansion sleeve body 21 fixedly arranged at the bottom of the middle core 1 and expanding outward from bottom to top and a deformed inner cavity 22 formed in the expansion sleeve body 21, and the outer wall of the expansion sleeve body 21 is integrally formed with external threads 23. Compared with ordinary bolts, the bolt is longer, and there is more space for the thread hole to press the expansion sleeve 2. In use, the locking structure is aligned with the thread hole, and the head body 31 of the head 3 is screwed, so that the expansion sleeve 2 and the middle core 1 are screwed into the thread hole. At this time, if the thread hole is irregularly tapered, the expansion sleeve 2 can be fitted with the inner wall of the thread hole during screwing, and the expansion sleeve body 21 is pressed and shrunk under the extrusion of the inner wall of the thread hole during screwing into the thread hole, so that the expansion sleeve body 21 is deformed into a shape with the same inclination as the inner wall of the thread hole, and is fitted to the inner wall of the thread hole, so that the external threads 23 are more engaged with the internal threads of the inner wall of the thread hole, thereby greatly improving the firmness of the connection, making the bolt more difficult to fall off, and at the same time, when the head 3 is screwed to the bottom end, the cladding block 32 can also be screwed into the top of the thread hole, and the cladding block 32 is deformed under the extrusion, so that it is filled with the top of the thread hole, further improving the firmness of the bolt connection.

[0018] The bottom of the middle core 1 is also provided with a positioning block 4, which is beneficial to align the thread hole on the workpiece more conveniently when the bolt is screwed in, and the circular truncated cone structure can make the bottom end contact the outer wall of the thread hole and be precisely positioned and aligned with the bolt and the thread hole.

[0019] The expansion sleeve body 21 is integrally formed with a plurality of V-shaped deformation grooves 24, which is beneficial to make the expansion sleeve body 21 deform more easily, thereby reducing the resistance during screwing and making the screwing more smooth.

[0020] The cladding block 32 is integrally formed with a reverse V-shaped compression groove 33, which is beneficial to make the cladding block 32 deform at the position of the compression groove 33, thereby reducing the force required in the later stage of screwing and making the screwing more simple and labor-saving.

[0021] The utility model discloses a working principle: the utility model uses, and the lock -in structure is aligned to the screw hole, and the head body 31 of the head 3 is twisted, and the expansion sleeve 2 of lock -in structure is twisted into the screw hole with the middle core 1, at this moment, if the screw hole presents irregular conical state, then can be in the process of twisting, through expansion sleeve 2 to be fitted with the screw hole inner wall, and in the process of being screwed into the screw hole, be extruded by the screw hole inner wall, under the extrusion effect, make expansion sleeve body 21 be pressed and produce shrinkage, further make expansion sleeve body 21 deformation be the shape of the same inclination with the screw hole inner wall, further fit in the screw hole inner wall, thus to make external thread 23 more and more with the internal thread of screw hole inner wall mesh, thus to improve the firmness of connection greatly, make bolt more difficult to fall off, and simultaneously when twisting to the bottom end, at this moment, can make head 3 fit on workpiece surface, at this moment, can make the cladding block 32 also enter the top of screw hole, and along with bolt being twisted, cause cladding block 32 to be extruded deformation, thus to make it fill the top of screw hole sufficiently, further improve the connecting firmness of bolt.

[0022] The utility model wants to protect the structure of product, and the model of each element is not the content of the utility model protection, is also the prior art, and the element that can realize the function of the utility model on the market can be as a kind of selection application.Therefore the model of element and the like parameters are not detailed in the utility model.The contribution of the utility model is that each element is combined scientifically.

[0023] The basic principle and main features of the utility model and its advantages are shown and described above, and the skilled person in the art should understand that the utility model is not limited to the above examples, and the above examples and description are only illustrative of the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed, and the scope of protection of the utility model is defined by the attached claims and their equivalents.The utility model is not detailed, and all are the prior art of the skilled person.

Claims

1. A set screw characterized by: The application relates to a lock-in structure and a head (3) fixedly arranged at the top end of the lock-in structure, wherein the lock-in structure comprises a middle core (1) with the head (3) fixedly arranged at the top end and an expansion sleeve (2) fixedly arranged at the bottom outer wall of the middle core (1).

2. A set screw according to claim 1, wherein: The bottom of the middle core (1) is further provided with a positioning block (4).

3. A set screw according to claim 1, wherein: The expansion sleeve (2) comprises an expansion sleeve body (21) fixedly arranged at the bottom of the middle core (1) and expanding outward from bottom to top, and a deformation inner cavity (22) formed in the expansion sleeve body (21), and an outer thread (23) is integrally formed on the outer wall of the expansion sleeve body (21).

4. A set screw according to claim 3, wherein: A plurality of V-shaped deformation grooves (24) are integrally formed on the expansion sleeve body (21).

5. The set screw of 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 a hollow structure and is integrally formed with an open groove at the bottom, and the middle core (1) can pass through the open groove.

6. A set screw according to claim 5, wherein: A reverse V-shaped compression groove (33) is integrally formed on the cladding block (32).

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