CN204921618U - Locking fastening combination screw - Google Patents

Abstract

The utility model relates to a fastener, in particular to an anti-loosening fastening combination screw. The proposed anti-loosening fastening combination screw has a first-order screw (1) used to cooperate with the inner threaded hole of the connector; the first-order screw (1) has a structure with an inner threaded hole (14) at the center, and the inner thread The hole (14) is a through hole that runs through the whole first-order screw; the top surface of the first-order screw nut (12) is a plane; the second-order screw (3) is set; the diameter of the screw rod of the second-order screw (3) is greater than that of the first-order screw ( The diameter of the inner threaded hole of 1), the gasket (2) is set between the nut of the second-order screw (3) and the nut (12) of the first-order screw, and the gasket (2) is sleeved on the second-order screw (3) on the screw. The utility model avoids screw loosening to the greatest extent, and at the same time, the novel combination screw can also be disassembled, which solves the problem that the screw is not easy to disassemble due to the application of fastening glue in the tightening process.

Description

An anti-loosening fastening combination screw

technical field

The utility model relates to a fastener, in particular to a combination screw for anti-loosening fastening.

Background technique

Screws are widely used as fasteners in the mechanical field. However, in the process of fixing the connecting parts, the screws are prone to loosening due to repeated shaking and vibration, and may fall off, affecting the fastening effect. Therefore, it is necessary to design a A screw that minimizes loosening is an important problem that needs to be solved.

Utility model content

Aiming at the deficiencies of the prior art, the purpose of this utility model is to propose a combination screw for anti-loosening fastening.

The utility model adopts following technical scheme for accomplishing the above object:

An anti-loosening fastening combination screw, the combination screw has a first-order screw used to cooperate with the internal thread hole of the connector; the first-order screw has a structure with an internal thread hole at the center, and the internal thread The hole is a through hole that runs through the entire first-order screw; the top surface of the first-order screw nut is a plane; there is a second-order screw that tightens the first-order screw rod and tightens the first-order screw and the internal thread hole of the connector. The diameter of the screw rod of the second-order screw is greater than the diameter of the internal thread hole of the first-order screw, and a gasket is arranged between the nut of the second-order screw and the nut of the first-order screw, and the gasket is sleeved in the on the screw of the second order screw.

The length of the second-order screw is less than or equal to the length of the first-order screw.

The utility model proposes an anti-loosening combination screw, which combines the first-order screw, the gasket and the second-order screw together to form an anti-loosening fastener, and adds an internal thread through hole in the center of the first-order screw, and passes through the first-order screw. The micro-interference fit between the internal thread hole and the external thread of the second-order screw can expand the outer diameter of the screw rod of the first-order screw during the tightening process of the second-order screw to the inner thread hole of the first-order screw, and then make the first-order screw and the connection The threaded holes of the parts can be fastened to the greatest extent, so that the screws can be avoided to the greatest extent from loosening. At the same time, the new combination screws can also be disassembled, which solves the problem that the screws are not easy to disassemble due to the application of fastening glue during the tightening process.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a structural schematic diagram of a first-order screw in the utility model.

Among the figure: 1, first-order screw, 2, spacer, 3, second-order screw, 11, first-order screw rod, 12, first-order screw nut, 14, internally threaded hole.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:

As shown in Figure 1, combined with Figure 2, a combination screw for anti-loosening fastening, the combination screw has a first-order screw 1 used to cooperate with the internal threaded hole of the connector; the first-order screw 1 is the center It has a structure of an internally threaded hole 14, and the internally threaded hole 14 is a through hole that runs through the entire first-order screw; the length of the internally threaded hole 14 is equal to the total length of the first-order screw 1, and the diameter of the internally threaded hole 14 depends on different occasions. The required fastening degree is different and designed into different sizes. The top surface of the first-order screw nut 12 is a plane; the first-order screw rod 11 is provided with tension, so that the first-order screw 1 and the inner threaded hole of the connector are fastened to An integrated second-order screw 3; the screw rod of the second-order screw 3 has a slight interference fit with the internal thread hole of the first-order screw 1, and a pad is arranged between the nut of the second-order screw 3 and the first-order screw nut 12 2, and the gasket 2 is sleeved on the screw rod of the second-order screw 3; the length of the second-order screw 3 is less than or equal to the length of the first-order screw 1; install the first-order screw 1 to the connecting In the inner threaded hole of the first-order screw 1 and tighten it, put the gasket 2 on the screw rod of the second-order screw 3 and install it in the inner threaded hole 14 of the first-order screw 1 for tightening, because the inner threaded hole 14 of the first-order screw 1 and the second-order screw The external thread of the step screw 3 is a micro-interference fit. During the tightening process of the second step screw 3, the outer diameter of the screw rod 11 of the first step screw 1 expands, thereby making the first step screw 1 and the threaded hole of the connector more tightly matched. , and not easy to loosen, a new combination screw also solves the problem that the screw is not easy to disassemble due to the fastening glue applied.

Claims (2)

1. a locking fastening screw assemblies, described screw assemblies has the single order screw (1) in order to coordinate with the interior threaded hole of link; It is characterized in that: the structure centered by described single order screw (1) with interior threaded hole (14), and described interior threaded hole (14) is for running through the through hole of whole single order screw; The end face of single order screw nut (12) is plane; The second order screw (3) being provided with tensioner single order screw screw rod (11), single order screw (1) is fastened as a whole with the interior threaded hole of link; The screw diameter of described second order screw (3) is greater than the interior threaded hole diameter of single order screw (1), be provided with pad (2) between the nut of described second order screw (3) and single order screw nut (12), and described pad (2) is nested with on the described screw rod of second order screw (3).

2. the locking fastening screw assemblies of one according to claim 1, is characterized in that: the length of described second order screw is less than or equal to the length of single order screw.