Structure of anti-loose double-end stud

Abstract

The utility model relates to an anti-loose double-end stud structure which comprises a threaded hole and a stud, the bottom of the threaded hole is a plane, and the end face of the end, connected with the threaded hole, of the stud is also a plane. The stud comprises a non-threaded section propped in the threaded hole, a first threaded section, a middle connecting rod, a second threaded section and a nut mounting section for mounting the nut; the end, making contact with the bottom of the threaded hole, of the non-threaded section is the stud and threaded hole connecting end, and the nut mounting section of the mounting nut and the nut connecting end are the stud and nut connecting end. The first threaded section and the second threaded section are equal in major diameter, and the diameter of the non-threaded section is smaller than the major diameter of the first threaded section. The flat bottom design and the size control of the threaded hole are more accurate, the stud and the bottom of the threaded hole are in plane contact, and the hexagonal prism structure design at the other end of the stud is combined, so that the two planes can be tightly propped against each other, each circle of threads are uniformly stressed when a machine runs for a long time, and meanwhile, the self-friction anti-loosening effect of the matched planes is achieved.

Description

Technical Field

[0001] The utility model relates to a double-ended stud, and in particular to a structure of an anti-loosening double-ended stud which mainly solves the technical problem that the existing double-ended stud can only manually screw a short threaded rod into a threaded hole of a connecting piece, and it is difficult to control the screw-in depth and the tightening degree, and the stud and nut are easy to loosen when the machine is running for a long time. Background Art

[0002] In engineering, compared with the connection and fastening methods of keys, pins, interference fit, welding, bonding, and riveting, the threaded connection method used by bolts and nuts is the most widely used. However, in some occasions where the thickness of the connecting parts is large or the connecting parts need to be frequently disassembled and assembled, if the connecting parts and accessories are connected by bolts, it will cause wear or even damage to the bolt threads. The use of studs greatly facilitates the disassembly and installation of accessories.

[0003] The structure of the existing studs is that both ends are threaded and the middle is a smooth connecting rod. When the connector and the accessory are connected, the short threaded rod is first buried in the threaded hole of the connector, and then the accessory is inserted into the middle connecting rod, and finally the ends are locked with a tightening washer and a nut. However, under some high-frequency rotation speed, vibration, high temperature and high pressure conditions of the internal environment, due to the long length of the stud body, it is easy to cause the stud buried in the connector end to loosen, causing liquid leakage at the mechanical connection end face, etc., which has a great impact on the safe operation of the machine.

[0004] The existing stud nut locking method will cause the stud and nut to loosen to a certain extent under the condition of high-frequency rotation speed, vibration, high temperature and high pressure in the internal environment of the machine for a long time. In addition, the existing double-headed stud has a structure with smooth connecting rods in the middle and threads at both ends. When the connector and the accessory are connected, the short threaded rod can only be manually screwed into the threaded hole of the connector, so it is difficult to control the screw-in depth and tightening degree. Utility Model Content

[0005] In view of the above problems, the main purpose of the utility model is to provide a structure of an anti-loosening stud bolt which mainly solves the technical problems that the existing stud bolts can only manually screw the short threaded rod into the threaded hole of the connecting piece, and it is difficult to control the screw-in depth and the tightening degree, and the stud bolt and the nut are easy to loosen when the machine runs for a long time.

[0006] The utility model solves the above technical problems through the following scheme: a structure of an anti-loosening double-head stud, the structure of the anti-loosening double-head stud comprises: a threaded hole, a stud, the bottom of the threaded hole is a plane, and the end surface of the connection end of the stud and the threaded hole is also a plane; the stud comprises a non-threaded section that is pushed into the threaded hole, a first threaded section, an intermediate connecting rod, a second threaded section, and a nut installation section for installing a nut; the end where the non-threaded section contacts the bottom of the threaded hole is the connection end between the stud and the threaded hole, and the connection end between the nut installation section for installing the nut and the nut is the connection end between the stud and the nut.

[0007] In a specific implementation example of the present invention, the major diameters of the first thread segment and the second thread segment are equal, both being d2, and the diameter d1 of the non-thread segment is less than the major diameter d2 of the first thread segment.

[0008] In a specific implementation example of the present utility model, the length of the non-threaded end at the top end of the threaded hole connection end is 7-12 mm.

[0009] In a specific implementation example of the utility model, there is a hexagonal prism structure of 8-15 mm in length outside the thread of the connecting end of the stud and the nut, and the size of the hexagonal prism structure is slightly smaller than the major diameter d2 of the thread section.

[0010] In a specific implementation example of the present invention, the entire stud is formed in one piece.

[0011] The positive progress of the utility model is that compared with the common similar technologies, the structure of the anti-loosening stud provided by the utility model has the following advantages: the flat bottom design of the threaded hole makes the size control more accurate, the stud and the bottom of the threaded hole adopt a plane contact, combined with the structural design of the hexagonal prism at the other end of the stud, the two planes can be tightly pressed, ensuring that the force of each circle of thread is uniform when the machine is running for a long time, and at the same time achieving the effect of anti-loosening with the plane self-friction. And the precise control of the size of the threaded hole and the stud will make the appearance of the machine more beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] Figure 2 Schematic diagram of the structure of the stud.

[0014] The following are the names corresponding to the label numbers in this utility model:

[0015] Threaded hole 1, stud 2, nut 3, bottom 101 of threaded hole, connecting end 201 of stud and threaded hole, connecting end 202 of stud and nut, non-threaded section 203, first threaded section 204, middle connecting rod 205, second threaded section 206, nut mounting section 207. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solution of the present invention in detail.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model. Figure 2 is a schematic diagram of the structure of the stud, such as Figure 1 and 2 As shown: the utility model provides a structure of a double-headed anti-loosening stud, which includes: a threaded hole 1, a stud 2, the bottom 101 of the threaded hole 1 is a plane, and the end surface 201 of the stud and the threaded hole connection end is also a plane; the stud 2 includes a non-threaded section 203 that is pressed into the threaded hole 1, a first threaded section 204, an intermediate connecting rod 205, a second threaded section 206, and a nut mounting section 207 for mounting the nut 3; in the specific implementation process, the entire stud 2 in the utility model is formed in one piece.

[0018] The end where the non-threaded section contacts the bottom 101 of the threaded hole 1 is the stud-threaded hole connection end 201 , and the connection end where the nut installation section 207 of the installation nut contacts the nut is the stud-nut connection end 202 .

[0019] The major diameters of the first thread segment 204 and the second thread segment 206 are equal, both being d2, and the diameter d1 of the non-thread segment 203 is less than the major diameter d2 of the first thread segment.

[0020] In a specific implementation process, the length of the non-threaded end at the top of the threaded hole connection end 201 in the present invention is 7-12 mm.

[0021] In a specific implementation process, the stud and nut connecting end 202 of the utility model has a hexagonal prism structure of 8-15 mm in length outside the thread, and the size of the hexagonal prism structure is slightly smaller than the major diameter d2 of the threaded section.

[0022] The bottom of the threaded hole in the utility model is changed to a plane design, the stud and the bottom of the threaded hole are in plane contact, the screwing depth is strictly controlled, and the force of each circle of thread is guaranteed to be uniform.

[0023] The connection end between the stud and the threaded hole in the utility model is similar to that of a common stud, and the top end has a non-threaded section with a diameter d1 less than the major thread diameter d2. This structural design makes it easier for the stud to be screwed into the threaded hole and at the same time provides a certain degree of protection for the thread on the top end of the stud.

[0024] The connecting end of the stud and the nut in the utility model is similar to that of a common stud, and the top end is provided with a hexagonal column structure, so that the stud and the threaded hole can be tightened by using a wrench.

[0025] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A structure of a stud bolt for preventing loosening, characterized in that: The structure of the anti-loosening double-head stud includes: a threaded hole and a stud. The bottom of the threaded hole is a plane, and the end face of the connecting end of the stud and the threaded hole is also a plane. The stud includes a non-threaded section that is pushed into the threaded hole, a first threaded section, an intermediate connecting rod, a second threaded section, and a nut mounting section for mounting a nut. The end where the non-threaded section contacts the bottom of the threaded hole is the connecting end between the stud and the threaded hole, and the connecting end between the nut mounting section for mounting the nut and the nut is the connecting end between the stud and the nut.

2. The structure of the anti-loosening stud according to claim 1, characterized in that: The major diameters of the first thread segment and the second thread segment are equal, both being d2, and the diameter d1 of the non-thread segment is less than the major diameter d2 of the first thread segment.

3. The structure of the anti-loosening stud according to claim 1, characterized in that: The length of the non-threaded end at the top of the threaded hole connection end is 7-12mm.

4. The structure of the anti-loosening stud according to claim 1, characterized in that: There is a hexagonal prism structure with a length of 8-15 mm outside the thread of the connection end of the stud and the nut, and the size of the hexagonal prism structure is slightly smaller than the major diameter d2 of the thread section.

5. The structure of the anti-loosening stud according to claim 1, characterized in that: The entire stud is molded in one piece.

Images