CN211059137U - A connection structure of FRP pipe - Google Patents

Abstract

The utility model discloses a connection structure of an FRP pipe, belonging to the technical field of composite material connection. The connection structure of the FRP pipe comprises an FRP pipe and a flange, and at least two blasting wedges are arranged inside the end of the FRP pipe. , the outer surface of the pull-explosion wedge is adapted to the shape of the inner hole of the FRP pipe, and the pull-explosion screw comprises a conical section that is adapted to the inner surface of the pull-explosion wedge and a A threaded section to which the small end of the tapered section is connected; the flange includes a flange body and a cylindrical portion sleeved on the outside of the FRP pipe, the end face of the FRP pipe abuts against the flange body, and the flange The middle part of the main body is provided with a first through hole through which the thread segment of the pull-and-explode screw is pierced, and a nut is connected to the thread segment's thread segment. The utility model is simple in structure, reliable in connection, and improves the bearing capacity of the FRP pipe.

Description

A connection structure of FRP pipe

technical field

The utility model belongs to the technical field of composite material connection, in particular to a connection structure of an FRP pipe.

Background technique

Fiber Reinforced Polymer (Fiber Reinforced Polymer, or Fiber Reinforced Plastic, FRP for short) is formed by reinforced fiber material, such as glass fiber, carbon fiber, aramid fiber, etc., and matrix material through winding, molding or pultrusion and other molding processes. composite material. Due to the advantages of light weight, high strength and corrosion resistance, composite materials have gradually been widely used in the engineering field.

At present, FRP pipes are connected by bonding a metal joint at both ends of the pipe body, and then connecting with other FRP pipes or parts through the metal joints. However, the bonding force of the FRP pipe and the metal joint is proportional to the bonding length within a certain range. After the critical length is exceeded, the bonding force does not increase with the increase of the bonding length. This phenomenon limits the bearing capacity of the FRP pipe, and the bonding There are obvious aging problems.

Therefore, in the field of composite material connection technology, there is still a need for research and improvement on the connection structure of FRP pipes, which is also a research hotspot and focus in the field of composite material connection technology at present, and is the starting point for the completion of the present utility model.

Utility model content

Therefore, the technical problem to be solved by the present invention is to provide a connection structure of the FRP pipe, which is simple in structure and reliable in connection, and can improve the bearing capacity of the FRP pipe.

In order to solve the above technical problems, the technical solution of the present utility model is: a connection structure of an FRP pipe, including a FRP pipe and a flange, and at least two pull-explosion wedges are arranged inside the end of the FRP pipe, and the pull-out wedges are arranged inside the end of the FRP pipe. The outer surface of the blasting wedge is adapted to the shape of the inner hole of the FRP pipe, and all the blasting wedges are enclosed to form an inner cavity for accommodating the blasting screw. A tapered section adapted to the inner surface of the wedge and a threaded section connected with the small end of the tapered section; the flange includes a flange body and a flange body located on one side and sleeved on the FRP pipe In the outer cylindrical part, the end face of the FRP pipe abuts against the flange body, and the middle part of the flange body is provided with a first through hole through which the threaded section of the pull-and-explode screw is passed. A nut is connected to the outgoing end of the segment.

As an improvement, a groove is provided on a side of the flange body away from the cylindrical portion, and both the nut and the penetrating end of the threaded section are located in the groove.

As an improvement, a rubber pad is arranged between the cylindrical portion and the FRP pipe.

As a further improvement, the rubber pad and the cylindrical portion are bonded together.

As an improvement, a plurality of second through holes are opened at the edge of the flange body.

As an improvement, the flange is a metal flange.

As an improvement, flanges are provided at both ends of the FRP pipe, and correspondingly, there are two tension bolts and two nuts.

After adopting the above-mentioned technical scheme, the beneficial effects of the present utility model are:

In the connection structure of the FRP pipe provided by the utility model, the flange, the blasting wedge, the blasting screw and the nut are designed, so that when in use, the blasting screw is put into the inner cavity enclosed by all blasting wedges. Then push the pull-explosion screw and all pull-explosive wedges into one end of the FRP pipe, and then assemble the flange so that the cylindrical part of the flange matches the outer circumference of the FRP pipe, and the flange body and the end face of the FRP pipe abut against each other, make the threaded section of the blasting screw go out of the flange body, and then tighten the nut. In the process of tightening the nut, as the blasting screw is gradually tightened, at least two blasting wedges gradually Move outward, pull the outer surface of the wedge to compress the FRP pipe on the cylindrical part of the flange, and generate enough pressing force. The contact area between the wedge block and the cylindrical part and the FRP pipe increases the pressing force, thereby improving the bearing capacity of the FRP pipe; in this way, when connecting two FRP pipes, first connect the flange to the end of each FRP pipe, and then Connect the flanges together to realize the connection of the FRP pipe. The connecting structure of the FRP pipe provided by the utility model does not damage the FRP pipe, has simple structure, reliable connection, and improves the bearing capacity of the FRP pipe.

Since the flange body is provided with a groove on the side away from the cylindrical portion, the threaded ends of the nut and the threaded section are both located in the groove, which can prevent the nut and the threaded section from passing through. The end takes up space, saves space, and at the same time facilitates the connection of FRP pipes.

Since a rubber pad is arranged between the cylindrical portion and the FRP pipe, the rubber pad can not only protect the FRP pipe, but also increase the frictional force between the FRP pipe and the cylindrical portion, thereby further improving the bearing capacity of the FRP pipe.

Since the rubber pad and the cylindrical portion are bonded together, it is convenient to assemble.

Since several second through holes are formed at the edge of the flange body, the flanges can be connected by fasteners such as bolts and nuts.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can also be obtained according to the extension of the drawings provided without creative efforts.

The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the conditions that the present invention can be implemented. The technical substantive significance, the modification of any structure, the change of the proportional relationship or the adjustment of the size, without affecting the effect that the utility model can produce and the purpose that can be achieved, should still fall within the scope disclosed in the present utility model. within the scope of technical content.

Fig. 1 is the structural representation of the connection structure of the FRP pipe provided by the first embodiment of the present invention;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is a partial enlarged view at B in Fig. 2;

Fig. 4 is the exploded view of Fig. 1;

Fig. 5 is the perspective view of pulling the wedge block;

Fig. 6 is the structural representation of the connection structure of the FRP pipe provided by the second embodiment of the present invention;

Fig. 7 is the structural representation of the connection state of two FRP pipes;

In the picture: 1-FRP pipe, 2-flange, 21-flange body, 211-first through hole, 212-second through hole, 22-cylindrical part, 23-groove, 3-pulling wedge , 4-pulling screw, 41-conical section, 42-thread section, 5-inner cavity, 6-nut, 7-bolt, 8-nut, 9-pad.

Detailed ways

The embodiments of the present invention will be described below by specific specific embodiments. Those who are familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are of the present invention. Some examples, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Terms such as "front", "rear", "left", "right", "inner", "outer", "middle", etc. quoted in this specification are only for the convenience of description and clarity, and are not used for The scope of implementation of the present invention is limited, and the change or adjustment of the relative relationship shall also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

Example 1

As shown in FIG. 1 to FIG. 5 together, a connection structure of an FRP pipe includes an FRP pipe 1 and a flange 2. In this embodiment, the flange 2 is a metal flange, for example, an aluminum alloy flange, and an aluminum alloy flange. The alloy is lighter in weight, and of course the flange 2 can also be made of other materials. The end of the FRP pipe 1 is provided with four blasting wedges 3. It should be noted that the number of blasting wedges 3 can be selected by those skilled in the art according to the actual situation, which can be two, three or five. Etc.; the outer surface of the blasting wedge 3 is adapted to the shape of the inner hole of the FRP pipe 1, and all the blasting wedges 3 are enclosed to form an inner cavity 5 for accommodating the blasting screw 4, and the blasting screw 4 includes and The inner surface of the blasting wedge 3 is fitted with a tapered section 41 and a threaded section 42 connected with the small end of the tapered section 41; the flange 2 includes a flange body 21 and a flange body 21 and a sleeve on one side of the flange body 21 In the cylindrical portion 22 outside the FRP pipe 1, the end face of the FRP pipe 1 abuts against the flange body 21, and the middle of the flange body 21 is provided with a first through hole 211 through which the threaded section 42 of the blasting screw 4 passes through, A nut 6 is connected to the outgoing end of the threaded section 42 .

In order to avoid the space occupied by the passing ends of the nut 6 and the threaded section 42, a groove 23 is provided on the side of the flange body 2 away from the cylindrical portion 22, and the passing ends of the nut 6 and the threaded section 42 are located in the groove 23, This saves space and at the same time facilitates the connection of the FRP pipe.

In this way, when in use, put the pulling screw 4 into the inner cavity 5 enclosed by all the pulling wedges 3, and then push the pulling screw 4 and all the pulling wedges 3 into one end of the FRP pipe 1 together, Then assemble the flange 2, so that the cylindrical part 22 of the flange 2 is matched with the outer circumference of the FRP pipe 1, the flange body 21 is abutted against the end face of the FRP pipe 1, and the threaded section 42 of the pulling and blasting screw 4 is passed through the method. Blue body 21, and then tighten the nut 6. In the process of tightening the nut 6, with the gradual tightening of the pulling and blasting screw 4, the four pulling and blasting wedges 3 gradually move outward, and the outer surface of the pulling and blasting wedges 3 is pulled. Press the FRP pipe 1 on the cylindrical part 22 of the flange 2 and generate sufficient pressing force. Compared with the glue connection in the prior art, the wedge block 3 and the cylindrical part 22 can be exploded by increasing the tension In this way, when connecting two FRP pipes, as shown in Figure 7, firstly connect the end of each FRP pipe 1 FRP pipe connection can be realized by connecting the two corresponding flanges 2 together.

In order to realize the connection between the flange and the flange, as shown in FIG. 4 , six second through holes 212 are formed on the edge of the flange body 21 . It should be noted that the number of the second through holes 212 is not limited to six. Those skilled in the art can choose according to actual needs, and details are not repeated here; as shown in FIG. Of course, as an alternative, the second through hole may not be provided, and the connection between the flange and the flange may be realized by welding or the like.

According to the connection requirements, both ends of the FRP pipe 1 can be provided with flanges 2 , and correspondingly, there are two pull-and-explode screws 4 and nuts 6 .

Embodiment 2

This embodiment is basically the same as the first embodiment. The difference is that, as shown in FIG. 6 , a rubber pad 9 is arranged between the cylindrical portion 22 and the FRP tube 1 . The rubber pad 9 can not only protect the FRP tube 1, but also The frictional force between the FRP pipe 1 and the cylindrical portion 22 can be increased, thereby further improving the bearing capacity of the FRP pipe 1 .

In order to facilitate assembly, the rubber pad 9 and the cylindrical portion 22 are bonded together.

The present embodiment also discloses a method for connecting an FRP pipe, which adopts the above-mentioned connecting structure of the FRP pipe and includes the following steps:

Put the blasting screw 4 into the inner cavity 5 enclosed by all the blasting wedges 3, and then push the blasting screw 4 and all the blasting wedges 3 into one end of the FRP pipe 1, including the rubber pad Step 9: Adhere to the cylindrical part 22, and then assemble the flange 2, so that the cylindrical part 22 of the flange 2 is matched with the outer circumference of the FRP pipe 1, the flange body 21 is abutted against the end face of the FRP pipe 1, and the pull-out The threaded section 42 of the screw rod 4 passes through the flange body 21 , and then the nut 6 is tightened.

To sum up, the connection structure of the FRP pipe provided by the present invention will not damage the FRP pipe, the structure is simple, the connection is reliable, and the bearing capacity of the FRP pipe is improved.

Although the present utility model has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention belong to the scope of protection of the present invention.

Claims (7)

1. a connection structure of FRP pipe, comprising FRP pipe and flange, it is characterized in that, the end of described FRP pipe is provided with at least two blasting wedges inside, the outer surface of described blasting wedges is The shape of the inner hole of the FRP pipe is adapted, and all the pull-explosion wedges are enclosed to form an inner cavity for accommodating the pull-explosion screw, and the pull-explosive screw includes an inner surface that is adapted to the pull-explosion wedge. The tapered section and the threaded section connected with the small end of the tapered section; the flange includes a flange body and a cylindrical portion located on one side of the flange body and sleeved outside the FRP pipe, the flange The end face of the FRP pipe abuts against the flange body, the middle of the flange body is provided with a first through hole through which the threaded section of the pull-and-explode screw is pierced, and the threaded section is connected with a threaded section. nut. 2 . The connection structure of the FRP pipe according to claim 1 , wherein a groove is provided on the side of the flange body away from the cylindrical portion, and the nut and the threaded end of the threaded section are provided. 3 . are located in the grooves. 3 . The connection structure of the FRP pipe according to claim 1 or 2 , wherein a rubber pad is provided between the cylindrical portion and the FRP pipe. 4 . 4 . The connection structure of the FRP pipe according to claim 3 , wherein the rubber pad and the cylindrical portion are bonded together. 5 . 5 . The connection structure of the FRP pipe according to claim 1 , wherein a plurality of second through holes are formed at the edge of the flange body. 6 . 6 . The connection structure of the FRP pipe according to claim 1 , wherein the flange is a metal flange. 7 . 7. The connection structure of the FRP pipe according to claim 1, characterized in that, both ends of the FRP pipe are provided with flanges, and correspondingly, there are two pull-and-explode screws and nuts.

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