CN205101372U - Bolt protective hood - Google Patents

Abstract

The utility model discloses a bolt protective hood, the safety cover is inside to be equipped with the first cavity that holds the gasket from bottom to top in proper order, hold the second cavity of nut and hold the end part of the screw rod's third cavity, first cavity, second cavity and third cavity communicate from beginning to end, the inner wall of third cavity is provided with the internal thread that matches with the the end part of the screw rod external screw thread, can fix on the inner wall of third cavity after messenger the end part of the screw rod stretches into.

Description

Bolt guard

technical field

The utility model relates to a bolt protection device, in particular to a bolt protection cover which is covered on gaskets, nuts and the ends of screw rods to prevent corrosion of the bolts and nuts and prevent them from falling off in a vibration environment.

Background technique

As a common connecting piece, bolts are widely used in various dynamic and static equipment, railways, bridges, shield tunnels, construction and other fields. A bolt is a fastener formed by screwing a screw and a nut through threads, and usually the end of the screw slightly protrudes from the nut. A gasket is also arranged under the nut. During use, bolts are usually exposed to the environment and are corroded by air, rain, snow and corrosive substances, which reduces the service life and may bring safety problems to production, living and transportation. At the same time, due to rust, the nut and screw rod are rusted together. , not easy to disassemble, bringing stability to maintenance and replacement.

In order to prevent the screw rod and the nut from corroding together and increase the service life of the bolt, a technical solution is to use stainless steel bolts, but the cost is greatly increased. The other is to smear grease on the bolts. Although this method can prevent rust, it will affect the appearance, and it is easy to cause the grease to drip to other related equipment or pollute adjacent objects. Another technology is to use the bolt protection cap, but because it is used in a place with vibration, the bite between the bolt and the protection cap is not enough, it will loosen and fall off after a period of time, and it may hit the moving equipment when it falls off , means of transport or other objects.

Utility model content

The purpose of the utility model is to provide a bolt protective cover, which can not only prevent the bolts and nuts from being corroded, but also prevent them from falling off in a vibration environment.

In order to achieve the above purpose, the utility model provides a bolt protective cover, the inside of the protective cover is sequentially provided with a first cavity for accommodating a gasket, a second cavity for accommodating a nut, and a third cavity for accommodating the end of a screw rod. cavity; the first cavity, the second cavity and the third cavity are connected end to end;

The inner wall of the third cavity is provided with an internal thread matching the external thread of the end of the screw, so that the end of the screw can be fixed on the inner wall of the third cavity after being inserted.

Preferably, the inner diameter of the first cavity is larger than the inner diameter of the second cavity, and the inner diameter of the second cavity is larger than the inner diameter of the third cavity, so that a stepped cavity is formed inside the bolt guard.

Preferably, an anti-skid portion is provided on the outer wall of the protective cover.

Further, the anti-slip part is a raised structure.

Furthermore, the protruding structure is arranged on the outer wall of the second cavity.

Optionally, the protruding structure is an anti-skid column extending longitudinally along the outer wall of the second cavity.

Preferably, the number of the anti-skid columns is at least two.

Preferably, the number of the protrusions is 8, and they are evenly distributed along the circumference of the outer wall of the second cavity.

Preferably, a flange extending outward is provided on the lower part of the outer wall of the first cavity, and the bottom surface of the flange is flush with the bottom surface of the outer wall of the first cavity.

Preferably, the outer diameter of the first cavity is larger than that of the second cavity, and the outer diameter of the second cavity is larger than that of the third cavity, so that the outer contour of the bolt guard is stepped.

Preferably, a sealant layer is provided on the inner wall of the first cavity.

In the bolt protective cover provided by the utility model, a first cavity for accommodating gaskets, a second cavity for accommodating nuts, and a third cavity for accommodating the end of a screw rod are sequentially provided in the protective cover from bottom to top; the first cavity The body, the second cavity and the third cavity are connected end to end, and the inner wall of the third cavity is provided with an internal thread that matches the external thread of the screw end, so that the screw end can be fixed on the inner wall of the third cavity after being inserted. . After adopting the above structure, on the one hand, the gaskets, nuts and screw ends exposed to the outside can be completely covered to prevent corrosion; The external structure is fixed, and it is not easy to fall off due to vibration.

Description of drawings

Fig. 1 is the main sectional view of the bolt protective cover provided by the utility model;

Fig. 2 is the top view of bolt guard;

Fig. 3 is a three-dimensional structural schematic diagram of the bolt protection cover.

In the picture:

1. First cavity 2. Second cavity 3. Third cavity 4. Internal thread 5. Anti-slip part 6. Flange

detailed description

In order to enable those skilled in the art to better understand the solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Explanation of terms: "Up" and "Down" in this utility model are only for convenience in describing the relative positional relationship between the components, which of course also includes the limitation of the equivalent relative positional relationship when different reference directions are used.

Please refer to Figure 1-3, a kind of bolt protective cover provided by the utility model has three cavities from bottom to top inside, which are respectively the first cavity 1, which can accommodate the gasket under the nut; the second cavity 2, capable of accommodating nuts mounted on the ends of bolts, and the third cavity 3, capable of accommodating the ends of bolts. Three cavities are arranged inside the bolt guard from bottom to top, and the inner diameter of the first cavity 1 is greater than the inner diameter of the second cavity 2, and the inner diameter of the second cavity 2 is greater than the inner diameter of the third cavity 3, thereby The three cavities form a stepped structure inside the bolt guard. Because under normal circumstances, at the end of the bolt, the diameter of the washer is larger than the diameter of the nut, and the diameter of the nut is larger than the diameter of the screw at the end, adopting this cavity with gradually increasing inner diameter can make each cavity and Washers, nuts and screw ends have good adaptability and play a role in stabilizing the overall structure.

Correspondingly, the outer diameter of the first cavity 1 is greater than the outer diameter of the second cavity 2, and the outer diameter of the second cavity 1 is greater than the outer diameter of the third cavity 3, so that the outer wall structure of the bolt guard also forms a Corresponding stepped structure inside. Since the internal and external structures are basically the same, the wall thickness of each part of each protective cover can be relatively uniform, and the force received by external vibration or impact is also more uniform, and local damage is not easy to occur.

An internal thread 4 is provided on the inner wall of the third cavity 3 so that the third cavity 3 forms a threaded hole, and the internal thread 4 is matched with the external thread of the screw rod at the end of the bolt. After the bolt protection cover is placed on the top of the bolt, the screw hole of the third cavity 3 can be matched with the external thread of the screw end by rotating the bolt protection cover, so as to fix the bolt protection cover and the bolt, effectively avoiding damage caused by external vibration or impact. Bolt guard comes off. In addition, since the length of the end of the screw (i.e. the length of the part protruding from the nut) is not fixed, the length of the third cavity 3 can be set to be greater than the length of the first cavity 1 and the second cavity 2, so that When the end of the screw is longer, the thread mating surface between the inner wall of the third cavity 3 and the end of the screw is larger, and the combination is tighter.

As a further improvement, an anti-slip portion 5 is provided on the outer wall of the bolt guard, and the anti-slip portion 5 may specifically be a protrusion provided on the outer wall of the second cavity 2, the protrusion starts from the bottom of the outer wall of the second cavity 2, Extending longitudinally along the outer wall of the second cavity 2, an anti-slip column is formed. When the staff installs the bolt protection cover, the width of the second cavity 2 is moderate, which is convenient for the hands to hold. When the bolt protection cover is rotated, the anti-slip column can avoid slipping of the hands and improve the installation efficiency. The structure of the anti-slip part 5 is not limited to the anti-slip column in this embodiment, and those skilled in the art can adopt other structures in the prior art that can play an anti-slip effect under the above-mentioned technical concept of the utility model, such as an anti-slip matte surface Or further apply the frosted surface to the non-slip posts.

The number of anti-skid columns is preferably 8, which are equally spaced and evenly distributed on the outer wall of the second cavity 2 along the circumferential direction. In this way, the number of anti-skid columns is relatively moderate, and the degree of density distributed on the outer wall of the second cavity 2 is also relatively appropriate. In addition, due to the uniform distribution of the anti-skid posts, it is more stable when handled by human hands.

Another improvement of the present invention is that a flange 6 is provided on the lower part of the outer wall of the third cavity 3 , and the bottom surface of the flange 6 is flush with the bottom surface of the outer wall of the third cavity 3 . Because there are tiny gaps between the bottom surface of the outer wall of the third cavity 3 and the surface of the equipment protected by the protective cover, rainwater and smoke may flow into the protective cover along these tiny gaps. By setting the above-mentioned flange 6, it is possible to These gaps are extended on the outside to make it difficult for rainwater and smoke to flow in. Even if corrosion occurs, it will first occur on the flange part. After the staff finds it, they can replace the bolt protection cover in time before the internal corrosion occurs.

A sealant is smeared on the inner wall of the first cavity to form a sealant layer, and when the bolt protection cover is tightened through the third cavity, the sealant is squeezed, so that the sealant is filled between the nut and the nut washer and the protection cover The gap between the bolts plays the role of isolating the air and further reducing the corrosion of the bolts.

The bolt protection cover provided by the utility model has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present utility model, and the descriptions of the above embodiments are only used to help understand the core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made to the utility model, and these improvements and modifications also fall into the protection of the claims of the utility model. within range.

Claims (10)

1. a bolt protective cover, is characterized in that, safety cover inside is provided with the first cavity holding pad, the second cavity holding nut from bottom to top successively and holds the 3rd cavity of screw rod end; First cavity, the second cavity are communicated with the 3rd cavity head and the tail;

The inwall of the 3rd cavity is provided with the internal thread mated with screw rod end outside thread, can be fixed on the inwall of the 3rd cavity after screw rod end is stretched into.

2. bolt protective cover according to claim 1, is characterized in that, the internal diameter of described first cavity is greater than the internal diameter of the second cavity, and the internal diameter of the second cavity is greater than the internal diameter of the 3rd cavity, makes the inside of bolt protective cover form the cavity volume of ladder-type.

3. bolt protective cover according to claim 1, is characterized in that, the outer wall of described safety cover is provided with anti-slip part.

4. bolt protective cover according to claim 3, is characterized in that, described anti-slip part is protruding structure.

5. bolt protective cover according to claim 4, is characterized in that, described protruding structure is arranged on the outer wall of the second cavity.

6. bolt protective cover according to claim 5, is characterized in that, described protruding structure is the cleat along the second chamber outer wall longitudinal extension.

7. bolt protective cover according to claim 6, is characterized in that, the quantity of described projection is 8, and is uniformly distributed along the circumference of the outer wall of the second cavity.

8., according to the arbitrary described bolt protective cover of claim 1-7, it is characterized in that, described first chamber outer wall bottom is provided with the flange extended laterally, and flange bottom surface is concordant with the bottom surface of the first chamber outer wall.

9., according to the arbitrary described bolt protective cover of claim 1-7, it is characterized in that, the external diameter of described first cavity is greater than the external diameter of the second cavity, and the external diameter of the second cavity is greater than the external diameter of the 3rd cavity, makes the external frame of bolt protective cover be ladder-type.

10., according to the arbitrary described bolt protective cover of claim 1-7, it is characterized in that, the first cavity inner wall is provided with sealant layer.