Method for blocking air passage in processing of plastic reinforced pipe

Abstract

The application relates to a kind of air passage blockage methods in plastic reinforced pipeline processing, and belongs to the field of pipeline processing.In order to solve the problem of existing air passage blockage inconvenience, an air passage blockage method in plastic reinforced pipeline processing is provided, which includes under the action of traction, making the fiber reinforced layer continuously pass through the mold cavity and move forward into the vacuum sizing box, then pausing the traction, pushing the fiber away from the fiber reinforced layer between the vacuum sizing box and the forming mold to communicate with the inside;then the other end of the flexible pull rope is inserted from the pushed-away place and tied at the outlet end, then the air plug is put into the inside from the pushed-away place, and the outer peripheral edge elastically acts on the circumferential inner wall of the fiber reinforced layer;continue to move forward under the action of traction and drive the air plug to move forward synchronously, so that the air plug enters the channel of the vacuum sizing box until the flexible pull rope is tensioned and stops moving forward, and the fiber reinforced layer continues to move forward.The method has the advantages of convenient operation and effective air passage blockage in the inside.

Description

TECHNICAL FIELD

[0001] The application relates to a method for blocking air passages in plastic reinforced pipeline processing and belongs to the pipeline processing field. BACKGROUND

[0002] The plastic reinforced pipeline is formed by arranging reinforcing fiber materials in the pipeline and generally comprises three layers of an inner layer, a reinforcing layer and an outer layer. In the production and processing process, continuous reinforcing fibers are wound on a core pipe of a pipeline processing device to form a cylindrical reinforcing layer, the reinforcing layer is then combined with molten plastic materials in a mold cavity of a forming mold to be formed into a pipe blank in one time, the pipe blank is then introduced into a vacuum sizing box to be sized and cooled and shaped, and finally, the pipe blank is introduced into a cutting process to obtain the final plastic reinforced pipeline. However, in the sizing and cooling forming process of the continuous reinforced plastic pipeline in the vacuum sizing box, the pipe blank is sized by being adsorbed on the inner wall of the vacuum sizing sleeve through the vacuum effect in the vacuum sizing box. However, since the plastic material of the pipe blank is not fully cooled in the continuous processing process, the pipe blank will be partially collapsed in the processing process. The phenomenon also exists when the pipe blank enters the inlet of the vacuum sizing box. The pipe blank is sized by being adsorbed on the inner wall of the sizing sleeve through the vacuum negative pressure in the vacuum sizing and cooling box. However, since the inside of the pipe blank is empty, the pipe blank is not supported and will be collapsed, which will affect the sizing quality in the processing process and the quality of the final pipeline. In addition, the structure of the vacuum sizing box itself is designed to be blocked in the internal passage, which will affect the operation, such as the fiber reinforced layer passing through the internal passage of the vacuum sizing box in the process of being pulled by the fiber reinforced layer. The operation is not convenient, the fiber reinforced layer is not easy to pull, and the additional structure in the vacuum sizing box is not easy to operate. The operation is not convenient, and the fixed blocking structure in the internal passage is not easy to maintain and replace. SUMMARY

[0003] The application provides a method for blocking air passages in plastic reinforced pipeline processing to solve the problem of how to provide a new air passage blocking method and the performance of convenient operation.

[0004] The application aims to realize the following technical scheme, a method for blocking air passages in plastic reinforced pipeline processing, characterized in that the method comprises the following steps:

[0005] A, under the traction of the traction machine, the fiber reinforced layer in the form of a cylinder continuously passes through the mold cavity of the forming mold and moves forward into the passage of the vacuum sizing box, then the traction is paused to stop the forward movement of the fiber reinforced layer, the fibers are removed from the fiber reinforced layer between the vacuum sizing box and the forming mold to communicate with the inside;

[0006] B, the other end of the flexible pull rope, which is tied to the air plug, is inserted into the fiber reinforced layer from the removal position and tied to the outlet end of the forming mold, the air plug is then put into the inside of the fiber reinforced layer from the removal position, and the outer peripheral edge of the air plug elastically acts on the circumferential inner wall of the fiber reinforced layer;

[0007] C, the traction is then started again to make the fiber reinforced layer continue to move forward under the action of the traction force and drive the air plug to move forward synchronously, the air plug enters the passage of the vacuum sizing box until the flexible pull rope is in tension and stops moving forward, the inside passage of the fiber reinforced layer is blocked by the air plug, and the fiber reinforced layer continues to move forward.

[0008] By the pulling-in process of the continuous fiber reinforced layer in the previous stage, an opening is first opened at the fiber reinforced layer between the vacuum sizing box and the forming die, which is communicated with the inside of the fiber reinforced layer, so as to provide an operable opening. Then, the other end of the flexible pull rope tied to the air plug is inserted into the opening and fixed at the outlet end of the forming die, which is equivalent to being fixed on the forming die from the inside of the fiber reinforced layer through the flexible pull rope. Then, the elastic air plug is put into the inside of the fiber reinforced layer through the opening, and the elastic air plug has a certain friction force on the inner wall of the fiber reinforced layer by the elastic effect of the outer peripheral edge of the air plug. Therefore, during the continuous forward movement of the fiber reinforced layer, the air plug placed in it can also move forward synchronously under the friction force between them, so that the air plug can be effectively and quickly brought into the corresponding position inside the channel of the vacuum sizing box. A new air path plugging method is adopted, which has the advantages of convenient operation and does not need to make changes in the scope of the existing vacuum sizing box, so that the original production line can be basically maintained, which is conducive to cost control. At the same time, since the flexible pull rope is connected to the air plug, when the air plug moves forward synchronously with the fiber reinforced layer to a certain distance, i.e. in the state of tension of the flexible pull rope, the air plug will not stop at this position under the tension of the flexible pull rope, and the friction between the air plug and the inner wall of the fiber reinforced layer will not affect the continuous forward movement of the fiber reinforced layer and the subsequent pipe forming process. The elastic effect of the air plug on the inner wall surface of the fiber reinforced layer plays an effective plugging role, which is equivalent to plugging the channel in the fiber reinforced layer by the air plug, rather than being communicated, so as to block the gas in the fiber reinforced layer from the side of the forming die and effectively achieve the effect of plugging the channel.

[0009] In addition, by using the flexible pull rope to connect the air plug, the length of the flexible pull rope can be adjusted without pre-installing the air plug in the vacuum sizing box. The air plug can be effectively put into the inside of the fiber reinforced layer by operating outside the forming equipment, which avoids the problem of blocking in the channel of the vacuum sizing box and makes it more convenient and effective to pull the fiber reinforced layer through the channel of the vacuum sizing box. Similarly, it can also achieve the advantages of convenient processing operation and convenience. At the same time, by using the feature that the flexible pull rope enters the vacuum sizing box when it is straightened, the air plug can enter a deeper position in the vacuum sizing box, so that the distance between the air plug and the forming die is farther, which can increase the overall pressure maintaining length and improve the air path plugging effect of the internal channel, making it more convenient for subsequent pipe processing quality and sizing quality.

[0010] In the air path blocking method in the plastic reinforced pipe processing, as preferred, before the air plug is put into the inside of the fiber reinforced layer in step B, the air plug is first put into a plastic guide pipe, and the outer peripheral edge of the air plug is elastically acted on the circumferential inner wall of the plastic guide pipe, and then the plastic guide pipe with the air plug is put into the fiber reinforced layer from the place where the air plug is pried, and the outer diameter of the plastic guide pipe matches the inner diameter of the fiber reinforced layer.

[0011] Since the air plug set in the fiber reinforced layer will be inclined or deformed in the process of continuous forward movement, and the air plug cannot effectively block the air path after the subsequent flexible pull rope is tensioned and positioned, the plastic guide pipe is first set to put the air plug into the plastic guide pipe, the plastic guide pipe is driven to move forward by the friction between the fiber reinforced layer and the plastic guide pipe, and then the air plug is driven to move forward into the vacuum sizing box by the plastic guide pipe, which can utilize the protection function of the plastic guide pipe to the air plug, and is more conducive to making the air plug directly elastically act on the inner wall after the subsequent flexible pull rope is tensioned, so that the outer peripheral edge of the air plug can be completely acted on the inner wall as much as possible, avoiding the inclination and other defects of the air plug in the early moving process, and more conducive to achieving the blocking effect of the internal passage, and also improving the overall service life of the air plug.

[0012] In the air path blocking method in the plastic reinforced pipe processing, as preferred, when the flexible pull rope is in a tensioned state in step C, the fiber reinforced layer continues to move forward to drive the plastic guide pipe to move forward, the air plug stops moving forward under the tension of the flexible pull rope, and after the air plug is separated from the plastic guide pipe, the outer peripheral edge of the air plug is elastically acted on the circumferential inner wall of the fiber reinforced layer.

[0013] In the air path blocking method in the plastic reinforced pipe processing, as preferred, before the plastic guide pipe with the air plug enters the inlet of the channel of the vacuum sizing box in step C, the following steps are further included:

[0014] When the fiber reinforced layer moves forward to drive the plastic guide pipe to move forward to the channel inlet of the vacuum sizing box, the traction of the traction machine is first paused to stop the forward movement of the fiber reinforced layer, and then the fiber reinforced layer is backwinded for a distance to be loose;

[0015] The plastic guide pipe with the air plug is sent into the inlet of the channel of the vacuum sizing box, and then the traction is started to continue the forward movement of the fiber reinforced layer.

[0016] Since the fiber reinforced layer is in tension during the forward movement, the plastic guide tube may be deformed due to extrusion during the movement, which is not conducive to entering the inlet of the vacuum sizing box during the movement. Through the above operation, the backward retreat distance is reduced, so that the plastic guide tube can be reset and then placed into the inlet of the vacuum sizing box, which can better drive the plastic guide tube into the vacuum sizing box when the continuous fiber reinforced layer enters the vacuum sizing box, and is also convenient for operation.

[0017] In the above-mentioned air path blocking method in the plastic reinforced pipe processing, as a preferred, the flexible pull rope is tensioned and the air plug stops moving forward, and the air plug is located at the corresponding position of the vacuum sizing sleeve in the vacuum sizing box. By locating the air plug at the vacuum sizing sleeve, the cooperation between the air plug and the vacuum sizing sleeve can be better formed after the air path is blocked, which is more conducive to subsequent pipe forming processing, and a certain distance is formed, which can more effectively ensure the effectiveness of pipe processing after air path blocking.

[0018] In the above-mentioned air path blocking method in the plastic reinforced pipe processing, as a preferred, the fiber reinforced layer enters the forming mold in step A further includes the following steps:

[0019] The continuous fiber is wound on the outer periphery of the core pipe of the forming equipment by the winding machine to form the fiber reinforced layer. The continuous fiber is continuously wound on the core pipe to achieve the purpose of continuous production, which is conducive to realizing the continuous effect of one-time processing and is more conducive to improving the convenience of operation.

[0020] In the above-mentioned air path blocking method in the plastic reinforced pipe processing, as a preferred, the air plug in step B includes an elastic sealing piece in a circular shape, and the outer peripheral edge of the elastic sealing piece elastically acts on the inner wall of the fiber reinforced layer. A material with good elasticity is used to better block the air path of the channel in the fiber reinforced layer, and the use is also convenient. As a further preferred, the outer peripheral diameter of the elastic sealing piece is slightly larger than the inner diameter of the fiber reinforced layer. The elastic force can be effectively guaranteed and the effective air path blocking in the interior can be effectively avoided, and the influence of the fiber reinforced layer on the air plug during movement can be effectively avoided.

[0021] In summary, compared with the prior art, the present application has the following advantages:

[0022] 1. By pushing the opening on the fiber reinforced layer, placing the air plug and fixing it at the outlet end of the forming mold by the flexible pull rope, and then synchronously driving the air plug into the position in the vacuum sizing box during the forward movement of the fiber reinforced layer, the internal channel of the fiber reinforced layer is blocked, which has the advantages of convenient operation and effective air path blocking.

[0023] 2. By putting the air plug into the plastic guide pipe in advance and then into the inside of the fiber reinforced layer, the plastic guide pipe can protect the air plug, the circumferential uniformity of the air plug can be maintained as much as possible to fully act on the inner wall, the defects such as inclination caused by the air plug in the early moving process are removed, and the effect of forming blockage to the internal passage is more beneficial to be realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a plastic reinforced pipe processing process flowchart of the present application.

[0025] Figure 2 is Figure 1 the structure schematic diagram of the flexible pull rope after tensioning.

[0026] Figure 3 is a plastic reinforced pipe processing process flowchart of the present application after adding a plastic guide pipe.

[0027] Figure 4 is Figure 3 the structure schematic diagram of the flexible pull rope after tensioning.

[0028] In the figure, 1 is a forming die; 2 is a fiber reinforced layer; 3 is a vacuum sizing box; 31 is a vacuum sizing sleeve; 4 is an air plug; 41 is an elastic sealing piece; 5 is a flexible pull rope; and 6 is a plastic guide pipe. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be further specifically described below through specific embodiments and the accompanying drawings, but the present application is not limited to these embodiments.

[0030] Combined with Figure 1 , the air path blockage method in the plastic reinforced pipe processing can be specifically completed by the following methods:

[0031] On the production line of the forming equipment of the plastic pipe processing, under the traction of the traction machine, the fiber reinforced layer 2 in the form of a cylinder wound on the core pipe of the forming equipment continuously enters into the forming die 1, and after the fiber reinforced layer 2 continuously entering into the mold cavity of the forming die 1 is pulled out from the outlet and moves forward into the passage of the vacuum sizing box 3, the traction is paused to stop the forward movement of the fiber reinforced layer 2, and the fiber is pushed away from the fiber reinforced layer 2 between the vacuum sizing box 3 and the forming die 1 to be communicated with the inside; it is equivalent to pushing the fiber reinforced layer 2 to the both sides to form an opening communicated with the inside, so as to facilitate the subsequent operation;

[0032] Select a flexible air plug 4, a flexible rope 5 is tied in the middle of the air plug 4, and the other end of the flexible rope 5 tied on the air plug 4 is inserted into the outlet end of the forming mold 1 from the above dislodged place and tied on the outlet end of the forming mold 1, which is equivalent to providing a connecting piece for tying on the outlet end of the forming mold 1, which is located on the inner side of the fiber reinforced layer 2, and the air plug 4 is put into the inside of the fiber reinforced layer 2 from the dislodged place, and the outer peripheral edge of the air plug 4 elastically acts on the circumferential inner wall of the fiber reinforced layer 2; it is equivalent to that the outer peripheral edge of the air plug 4 elastically acts on the inner wall of the fiber reinforced layer 2, which can block the internal passage and has the blocking function, and the elastic action of the air plug 4 on the inner wall has a certain friction force, which can also more conveniently move forward through the fiber reinforced layer 2 and achieve the effect of synchronous movement;

[0033] After placing the above-mentioned air plug 4, restart the traction machine and continue to start traction to make the fiber reinforced layer 2 continue to move forward under the action of the traction force of the traction machine and drive the air plug 4 to move forward synchronously, which is equivalent to that the friction force of the above-mentioned air plug 4 elastically acting on the inner wall surface of the fiber reinforced layer 2 drives the air plug 4 to move forward, so that the air plug 4 enters the passage of the vacuum sizing box 3 until the flexible rope 5 is tensioned and stops moving forward, the air plug 4 blocks the internal passage of the fiber reinforced layer 2, and the fiber reinforced layer 2 continues to move forward. The above method effectively and conveniently realizes the blocking function of the internal passage of the fiber reinforced layer 2, and has the advantage of good blocking effect. The above uses the effect of the flexible rope 5, which is fixed at one end on the side of the forming mold 1 and at the other end on the air plug 4, so that when the flexible rope 5 is tensioned, the tension of the flexible rope 5 is used to fix the air plug 4, so that it will not move forward during the process of moving forward with the fiber reinforced layer 2, forming an effective fixed blocking effect, and having excellent blocking effect inside. When the pipeline is processed, the internal passage can be effectively blocked by inflating. The above-mentioned flexible rope 5 can be steel wire rope, braided wire rope and the like.

[0034] In a more preferred embodiment, before the air plug 4 is put into the fiber reinforced layer 2, the air plug 4 is first put into a plastic guide tube 6, and the outer peripheral edge of the air plug 4 elastically acts on the circumferential inner wall of the plastic guide tube 6, and then the plastic guide tube 6 with the air plug 4 is put into the fiber reinforced layer 2 from the place where it is pushed away, and the outer diameter of the plastic guide tube 6 matches the inner diameter of the fiber reinforced layer 2. Through the protection of the plastic guide tube 6, the air plug is prevented from being affected by external forces such as the forward movement of the fiber reinforced layer 2, and phenomena such as tilting may occur during the forward movement. By synchronously driving the air plug to move forward through the plastic guide tube 6 in advance, the air plug can better enter the predetermined position, and the influence on the air plug 4 during the movement is avoided, which is more conducive to forming an effective plugging effect.

[0035] In a further more preferred embodiment, when the flexible pull rope 5 is in a tensioned state, the fiber reinforced layer 2 continues to move forward to drive the plastic guide tube 6 to move forward, and the air plug 4 stops moving forward under the pulling force of the flexible pull rope 5, and after the air plug 4 is separated from the plastic guide tube 6, the outer peripheral edge of the air plug 4 elastically acts on the circumferential inner wall of the fiber reinforced layer 2.

[0036] In a further more preferred embodiment, before the plastic guide tube 6 with the air plug 4 enters the inlet of the channel of the vacuum sizing box 3, the following operations are further included:

[0037] When the fiber reinforced layer 2 moves forward to drive the plastic guide tube 6 to move forward to the inlet of the channel of the vacuum sizing box 3, it is equivalent to moving close to the inlet position of the vacuum sizing box 3, and the traction machine is first paused to stop the forward movement of the fiber reinforced layer 2, and then the fiber reinforced layer 2 is retracted by a certain distance to become slack; it is equivalent to allowing the traction machine in the subsequent process to release the retraction, so that the previously tensioned fiber reinforced layer 2 becomes slack, facilitating subsequent operations;

[0038] The plastic guide tube 6 with the air plug 4 is sent into the inlet of the channel of the vacuum sizing box 3, the traction machine is restarted, and the fiber reinforced layer 2 continues to move forward. Since the tension of the fiber during the continuous forward movement of the fiber reinforced layer 2 may cause the plastic guide tube 6 put inside to deform, it is not easy for it to enter the channel, and through the above operation, the plastic guide tube 6 can be restored to a circular shape and then put into the inlet, which is more convenient for operation.

[0039] In a further embodiment, when the flexible pull rope 5 is tensioned and the air plug 4 stops moving forward, the air plug 4 is located at a position corresponding to the vacuum sizing sleeve 31 in the vacuum sizing box 3. It is equivalent to that the distance of the air plug 4 entering the channel of the vacuum sizing box 3 is at the position of the vacuum sizing sleeve 31.

[0040] In a further embodiment, the continuous fiber is wound around the outer periphery of the core pipe of the forming device by a winding machine to form the fiber reinforced layer 2 in a cylindrical shape before entering the forming mold 1. Specifically, the fiber reinforced layer 2 can be formed on the outer periphery of the core pipe in the production line of the pipe processing, and specifically, the continuous fiber on the fiber unwinding device is pulled to form an axial fiber layer, and / or the continuous fiber is wound around the axial fiber layer in the circumferential direction of the core pipe to form a winding fiber layer, so that the axial fiber layer and the winding fiber layer together form the fiber reinforced layer 2. The winding method can be selected according to actual needs.

[0041] In a further preferred embodiment, the air plug 4 includes an elastic sealing piece 41 in a circular shape, and the outer peripheral edge of the elastic sealing piece 41 elastically acts on the inner wall of the fiber reinforced layer 2. This has the advantage of good plugging effect. Preferably, the outer diameter of the elastic sealing piece 41 is slightly larger than the inner diameter of the fiber reinforced layer 2. In a further embodiment, the elastic sealing piece 41 can be two, and the two elastic sealing pieces 41 are spaced apart along the axial direction of the connecting shaft, so that the two elastic sealing pieces 41 are sleeved on the connecting shaft for fixation. Each elastic sealing piece 41 is clamped and fixed by two clamping pieces, and the outer diameter of the elastic sealing piece 41 is larger than the outer diameter of the clamping piece. The elastic sealing piece 41 and the clamping piece are coaxially arranged. The flexible pull rope 6 can be fixed on the tether hole of the connecting shaft for connection and fixation, and the other end of the flexible pull rope 6 is fixed on the binding hole on the outlet side of the forming mold 3, which can better improve the stability of the connection and fixation of the flexible pull rope. The elastic sealing piece 41 can have a certain deformation interval, and the two elastic sealing pieces 41 are spaced apart, which can form two plugging effects, and can better improve the stability of the sealing. The elastic sealing piece 41 can be made of elastic rubber material.

[0042] The traction of the traction machine can pull the continuously outgoing fiber reinforced layer 2 through the front end of the traction pipe, drive the fiber reinforced layer 2 to move a certain distance, and then the continuously reinforced layer 2 from the outlet of the forming mold 1 forms a complete structure and then enters the subsequent operation.

[0043] The specific embodiments described in the present application are only examples of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0044] While the application has been described and illustrated with reference to specific embodiments, it will be apparent for those skilled in the art that various changes or modifications in form and detail can be made without departing from the spirit and scope of the application.

Claims

1. A method for blocking an air path in the processing of a plastic reinforced pipe, characterized in that: The method comprises the following steps: A. Under the pulling action of a traction machine, the cylindrical fiber-reinforced layer (2) continuously passes through the mold cavity of the forming mold (1) and moves forward into the passage of the vacuum sizing box (3), then the pulling is paused to stop the fiber-reinforced layer (2) from moving forward, and fibers are spread apart from the fiber-reinforced layer (2) between the vacuum sizing box (3) and the forming mold (1) to communicate with the interior; B. The other end of the flexible drawstring (5) with one end tied to the air plug (4) is then extended from the separated portion and tied to the outlet end of the molding die (1). The air plug (4) is then placed into the interior of the fiber reinforced layer (2) from the separated portion, with the outer peripheral edge of the air plug (4) elastically acting on the circumferential inner wall of the fiber reinforced layer (2); C. Continue to pull so that the fiber reinforced layer (2) continues to move forward under the action of the pulling force and drives the air plug (4) to move forward synchronously, so that the air plug (4) enters the channel of the vacuum sizing box (3) until the flexible pull rope (5) is tensioned and then stops moving forward, and the internal channel of the fiber reinforced layer (2) is blocked by the air plug (4), and the fiber reinforced layer (2) continues to move forward.

2. The method for blocking the gas path in the processing of plastic reinforced pipes according to claim 1, characterized in that: Before the air plug (4) is placed into the interior of the fiber reinforced layer (2) in step B, the air plug (4) is first placed in a plastic guide tube (6), and the outer peripheral edge of the air plug (4) elastically acts on the circumferential inner wall of the plastic guide tube (6), and then the plastic guide tube (6) with the air plug (4) is placed into the fiber reinforced layer (2) from the separated part, and the outer diameter of the plastic guide tube (6) matches the inner diameter of the fiber reinforced layer (2).

3. The method for blocking the gas path in the processing of plastic reinforced pipes according to claim 2, characterized in that: When the flexible pull rope (5) in step C is in a tensioned state, the fiber reinforced layer (2) continues to move forward to drive the plastic guide tube (6) to move forward, and the air plug (4) stops moving forward under the pulling force of the flexible pull rope (5). After the air plug (4) is separated from the plastic guide tube (6), the outer peripheral edge of the air plug (4) elastically acts on the circumferential inner wall of the fiber reinforced layer (2).

4. The method for blocking the gas path in the processing of plastic reinforced pipes according to claim 3, characterized in that: Before the plastic guide tube (6) with the air plug (4) enters the inlet of the channel of the vacuum calibrating box (3) in step C, the following steps are also included: When the fiber reinforced layer (2) moves forward and drives the plastic guide tube (6) to move forward to the channel entrance of the vacuum sizing box (3), the traction of the traction machine is first paused to stop the fiber reinforced layer (2) from moving forward, and then the fiber reinforced layer (2) is retreated a certain distance to become relaxed; The plastic guide tube (6) with the air plug (4) is sent into the inlet of the channel of the vacuum sizing box (3), and then traction is started to make the fiber reinforcement layer (2) continue to move forward.

5. The method for blocking the gas path in the processing of plastic reinforced pipes according to any one of claims 1 to 4, characterized in that: After the flexible pull rope (5) is tightened in step C and the air plug (4) stops moving forward, the air plug (4) is located at a position corresponding to the vacuum calibrating sleeve (31) in the vacuum calibrating box (3).

6. The method for blocking the gas path in the processing of plastic reinforced pipes according to any one of claims 1 to 4, characterized in that: Before the fiber-reinforced layer (2) enters the forming mold (1) in step A, the following steps are also included: The fiber-reinforced layer (2) is formed by winding continuous fibers around the outer periphery of a core tube of a forming device through a winding machine.

7. The method for blocking the gas path in the processing of plastic reinforced pipes according to any one of claims 1 to 4, characterized in that: The air plug (4) in step B comprises a circular elastic sealing sheet (41), the outer peripheral edge of the elastic sealing sheet (41) elastically acts on the inner wall of the fiber reinforced layer (2).

8. The method for blocking the gas path in the processing of plastic reinforced pipes according to claim 7, characterized in that: The outer diameter of the elastic sealing sheet (41) is slightly larger than the inner diameter of the fiber-reinforced layer (2).

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