Square-head bolt for equipment installation

Abstract

A cylindrical table is arranged in the middle of the lower surface of a square head, the lower surface of the cylindrical table is connected with a screw through a frustum structure, the cylindrical table is of a flat cylinder structure, and the diameter of the upper surface and the diameter of the lower surface of the cylinder are smaller than the side length of the upper surface and the side length of the lower surface of the square head. The frustum structure is of a big-end-up frustum structure, and external threads are arranged on the outer surface of the screw rod. The bolt structure is suitable for installation and use of equipment parts, when a nut on the bolt is tightened for fastening, the square head is used for fixing the bolt and preventing the bolt from rotating so that the nut can be better tightened and the equipment parts can be installed and assembled together, and the bolt structure has the advantages of being convenient to use, universal, large in bearing torque, simple in structure, low in cost and the like. And the existing square-head bolt is supplemented.

Description

Technical Field

[0001] The utility model relates to the technical fields of equipment manufacturing, metallurgy, mining and the like, and in particular to a bolt structure. Background Art

[0002] At present, the equipment manufacturing industry needs to assemble the equipment to complete the manufacturing of the equipment when producing and manufacturing the equipment. Different connection methods are required when assembling the equipment, mainly riveting, welding, bolt connection, plug-in, etc. Among them, bolt connection is one of the most commonly used connection methods. It is convenient, fast and firm and is widely used. However, due to the limitations of equipment performance, space, fixing method, etc. when installing some parts, different bolt forms need to be used, namely, there are dozens of types such as hexagonal bolts, hexagonal bolts, oval head bolts, square head bolts, expansion bolts, etc.

[0003] During assembly, the bolts and nuts need to be tightened and fixed to play a connecting role. That is, when tightening the nut on the bolt, the bolt cannot rotate so that the nut can be tightened with a wrench. Otherwise, the nut cannot be tightened and cannot play a connecting role, and the bolt connection loses its meaning. Therefore, it is necessary to choose different anti-rotation structures to fix the bolts.

[0004] At present, there is a tenon bolt assembly, for example, the public document with publication number CN210599779U, publication date 2020-05-22, and patent name "A new type of flat round head tenon bolt", which discloses a flat round head tenon bolt, including a flat round head, a connecting mechanism is provided on the outer surface of one side of the flat round head, a stud is provided on one side of the connecting mechanism, and an external thread is provided on the outer surface of the stud, a bearing groove is provided in the middle of the outer surface of the other side of the flat round head, a hexagonal wrench groove is provided in the middle of the outer surface of one side of the bearing groove, a hexagonal limiting block is provided inside the hexagonal wrench groove, a connecting block is provided inside the bearing groove on one side of the hexagonal limiting block, a flat screwdriver groove is provided in the middle of the outer surface of one side of the connecting block, and a circular hole is provided on the outer surface of one side of the flat screwdriver groove.

[0005] Although similar bolt structures solve the anti-rotation problem, the overall structure of the bolt is complex, and its reliability is not as good as that of a simple bolt structure. In addition, the overall cost will also increase, which is not conducive to popularization and promotion. Summary of the invention

[0006] The technical problem to be solved by the utility model is to realize a bolt structure which has a more advantageous structure and is easier to process and manufacture than similar bolts, saving costs. The bolt structure is a square head bolt suitable for tightening bolts in special products and narrow spaces, when the bolts cannot be fixed by tightening equipment or are not easy to be fixed by manpower.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a square head bolt for equipment installation, a cylindrical table is provided in the middle of the lower surface of the square head, the lower surface of the cylindrical table is connected to the screw rod via a frustum structure, the cylindrical table is a flat cylindrical structure, the diameters of the upper and lower surfaces of the cylinder are smaller than the side lengths of the upper and lower surfaces of the square head, the frustum structure is a frustum structure with a larger upper part and a smaller lower part, and the outer surface of the screw rod is provided with an external thread.

[0008] The square head is a flat structure, and the upper surface and the lower surface are squares with equal sides.

[0009] The heights of the cylindrical cone and the frustum structure are designed according to needs, and the outer diameter of the upper surface of the frustum structure is the same as the outer diameter of the lower surface of the cylindrical cone.

[0010] The outer diameter of the lower surface of the frustum structure is slightly larger than the outer diameter of the screw rod, and the frustum structure and the screw rod are connected via a rounded transition.

[0011] The square head, cylindrical cone, frustum structure and screw rod are all arranged symmetrically about the same central axis.

[0012] The bolt holes of equipment components using square head bolts are provided with stops that protrude to contact the side of the square head.

[0013] The bolt holes of equipment components using square head bolts are provided with square countersunk holes that fit the square head clearance.

[0014] The upper part of the bolt hole is provided with an opening which is larger at the top and smaller at the bottom for placing the frustum structure, and a hole whose size matches the screw rod at the lower part.

[0015] The bolt hole is a hole that penetrates the equipment component, and the other end of the bolt hole is provided with a gasket and a nut fixed on the external thread of the screw.

[0016] The bolt structure of the utility model is suitable for the installation of equipment parts. When the nut on the bolt is tightened for fastening, the square head is used to fix the bolt and cannot rotate, so that the nut can be tightened better and the equipment parts can be installed and assembled together. It has the characteristics of convenience, versatility, large torque bearing capacity, simple structure, low cost, etc., and supplements the existing square head bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following is a brief description of the contents expressed in each figure in the utility model specification and the marks in the figure:

[0018] Figure 1 This is a schematic diagram of the square head bolt structure for equipment installation;

[0019] Figure 2 A schematic diagram of a square head bolt assembly scheme 1 for equipment installation;

[0020] Figure 3 Schematic diagram of square head bolt assembly scheme 2 for equipment installation;

[0021] The marks in the above figures are: 1. square head; 2. cylindrical table; 3. frustum structure; 4. screw; 5. fillet; 6. nut; 7. stopper; 8. equipment parts. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the specific implementation methods of the present invention, such as the shapes and structures of the components involved, the relative positions and connection relationships between the components, the functions and working principles of the components, the manufacturing process and the operation and use methods, etc., through the description of the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0023] like Figure 1 As shown, the square head 1 bolt for equipment installation is provided with a square head 1, a cylindrical table 2 is provided in the middle of the lower surface of the square head 1, the lower surface of the cylindrical table 2 is connected to the screw rod 4 through the frustum structure 3, the square head 1, the cylindrical table 2, the frustum structure 3 and the screw rod 4 are all symmetrically arranged with the same central axis. This bolt has the advantages of variable specifications, relatively convenient processing, relatively large force and torque, and variable fixing method. The square head 1 is a flat structure, and the upper and lower surfaces are squares of equal length. The square head 1 structure plays an anti-rotation role.

[0024] The cylindrical platform 2 is a flat cylindrical structure, and the diameters of the upper and lower surfaces are smaller than the side lengths of the upper and lower surfaces of the square head 1. Figure 2 , 3 In order to better show the overall structure of the bolt, the proportional length of the cylindrical base 2 and the fillet 5 is magnified. The cylindrical structure is easy to process and its height can be adjusted.

[0025] The frustum structure 3 has good bonding properties and a large force-bearing area. The outer diameter of the upper surface of the frustum structure 3 is the same as the outer diameter of the lower surface of the cylindrical cone 2. The frustum structure 3 is easier to process than the structure with tenon bolts and has lower cost. The outer diameter of the lower surface of the frustum structure 3 is slightly larger than the outer diameter of the screw 4. The frustum structure 3 and the screw 4 are transitionally connected through a fillet 5. The fillet 5 at the intersection of the frustum structure 3 and the bolt screw 4 can be enlarged to reduce stress concentration. The outer surface of the screw 4 is provided with an external thread. The screw 4 is a structure for tightening the nut 6, and threads and diameters of different specifications can be manufactured.

[0026] There are two ways to assemble: Figure 2 As shown, the bolt hole of the equipment component 8 using the square head 1 bolt is provided with a stopper 7 protruding for contacting the side of the square head 1. The square head 1 can be higher than the equipment installation surface. The bolt can be fixed by spot welding the fixing block on the surface. The conical hole of the conical part of the equipment is easier to process than the bolt hole with tenon, which saves cost.

[0027] like Figure 3 As shown, the square head 1 is sunk inside the equipment, that is, the bolt hole of the equipment component 8 using the square head 1 bolt is provided with a square countersunk hole that is clearance-matched with the square head 1. When the square head 1 of the bolt is sunk inside to prevent rotation, its equipment processing is easier than that of the tenon bolt.

[0028] In the above two assembly methods, the square head 1 is used to fix the bolt, and the purpose is to prevent the bolt from rotating when tightening the nut 6, otherwise the nut 6 cannot be tightened and the connection function cannot be achieved. The upper part of the bolt hole of the above bolt assembly structure is provided with an opening that is larger at the top and smaller at the bottom for placing the frustum structure 3, and a hole whose lower size matches the screw rod 4. The bolt hole is a hole that passes through the equipment component 8, and the other end of the bolt hole is provided with a gasket and a nut 6 fixed on the external thread of the screw rod 4.

[0029] The bolt can be selected according to the stress of the equipment, and different materials can be selected, which has strong selectivity. Compared with similar bolts, this kind of structural bolt has certain characteristics in processing, fixing, stress, etc. It is a supplement to the existing bolt types and has a wide range of application prospects and practical value.

[0030] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A square head bolt for equipment installation, characterized in that: A cylindrical cone is provided in the middle of the lower surface of the square head, and the lower surface of the cylindrical cone is connected to the screw via a frustum structure. The cylindrical cone is a flat cylindrical structure, and the diameters of the upper and lower surfaces of the cylinder are smaller than the side lengths of the upper and lower surfaces of the square head. The frustum structure is a frustum structure with a larger upper portion and a smaller lower portion, and the outer surface of the screw is provided with an external thread.

2. The equipment installation square head bolt according to claim 1, characterized in that: The square head is a flat structure, and the upper surface and the lower surface are squares with equal sides.

3. The equipment installation square head bolt according to claim 2, characterized in that: The heights of the cylindrical cone and the frustum structure are designed according to needs, and the outer diameter of the upper surface of the frustum structure is the same as the outer diameter of the lower surface of the cylindrical cone.

4. The equipment installation square head bolt according to claim 3, characterized in that: The outer diameter of the lower surface of the frustum structure is slightly larger than the outer diameter of the screw rod, and the frustum structure and the screw rod are connected via a rounded transition.

5. The equipment installation square head bolt according to any one of claims 1 to 4, characterized in that: The square head, cylindrical cone, frustum structure and screw rod are all arranged symmetrically about the same central axis.

6. The equipment mounting square head bolt according to claim 5, characterized in that: The bolt holes of equipment components using square head bolts are provided with stops that protrude to contact the side of the square head.

7. The equipment installation square head bolt according to claim 5, characterized in that: The bolt holes of equipment components using square head bolts are provided with square countersunk holes that match the clearance of the square head.

8. The equipment mounting square head bolt according to claim 6 or 7, characterized in that: The upper part of the bolt hole is provided with an opening which is larger at the top and smaller at the bottom for placing the frustum structure, and a hole whose size matches the screw rod at the lower part.

9. The equipment mounting square head bolt according to claim 8, characterized in that: The bolt hole is a hole that penetrates the equipment component, and the other end of the bolt hole is provided with a gasket and a nut fixed on the external thread of the screw.

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