A shaping mold and shaping method for shape memory patch tube

Abstract

A shaping die and shaping method for shape memory patching tubes, belonging to the technical field of industrial transmission pipeline repair. The present invention solves the problem that the existing shaping die is prone to cause the patching tube to rebound when pressurizing and shaping the multi-petal patching tube. It also includes at least two fixing rods, the upper end surface of the base is processed with a first arc-shaped ridge along its length direction, the pressure rod is horizontally fixed to the pressure head of the press and is located directly above the patching tube, the number of the fixing rods is an even number and they are arranged opposite to each other on the outside of the patching tube, the side of the fixing rod close to the patching tube is processed with a second arc-shaped ridge, and the two oppositely arranged fixing rods have their ends fixed by bolts, and the pressure rod, the first arc-shaped ridge and the second arc-shaped ridge are pressed one by one into the groove between each adjacent two petals on the shaping column.

Description

Technical Field

[0001] The invention relates to a shaping die and a shaping method for a shape memory patching tube, belonging to the technical field of industrial transmission pipeline repair. Background Art

[0002] In the field of industrial production, high-pressure gas and liquid pipelines, flammable and explosive, and toxic and corrosive gas and liquid special transmission pipelines face many practical problems. That is, due to the long-term transmission of corrosive gases and liquids, and the influence of external natural conditions, the transmission pipelines are severely corroded, causing damage to their local structures. Conventional repair methods in the past (cutting, welding, repair welding, etc.) were greatly restricted by on-site construction conditions, and many defective and damaged parts could not be completely repaired. Therefore, a method that can overcome the limitations of on-site conditions and conventional repair methods is urgently needed.

[0003] The invention patent application with application number 2018111074897 filed by the applicant on September 21, 2018, requests protection for a shape memory compensating tube and a forming mold for making the compensating tube, wherein the forming mold can be used to form the shape memory compensating tube. On this basis, the applicant conducted further research on the forming mold and found that when heating and forming the compensating tube with three petals or more (i.e., the compensating tube involved in the above patent application), because the press can only move up and down, each heating can achieve a concave surface or a vertically symmetrical shape. For the molding of two concave surfaces, when molding concave surfaces at other positions, it is necessary to remove the molding die first, rotate the patching tube circumferentially, and then repeat the previous molding operation; because the patching tube can only be pressurized and molded when it is heated above the glass transition temperature, but when the patching tube at the molded part is heated, the patching tube at this position will rebound, which will cause the petals of the patching tube after the final pressurized molding to be uneven, affecting the 360-degree full fit between the patching tube and the pipeline to be repaired, and further causing leakage of the gas or liquid transported in the pipeline to be repaired. Summary of the invention

[0004] The present invention aims to solve the problem that the existing shaping molds easily cause the multi-petal shaping tube to rebound when pressurizing the shaping tube, and further provides a shaping mold and shaping method for shape memory shaping tubes.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A forming mold for a shape memory patch tube, comprising a forming column, a base and a pressure rod, wherein the forming column is coaxially inserted into a horizontally arranged patch tube and has a multi-petal cross section, and the patch tube is horizontally arranged on the base, and further comprises at least two fixing rods, wherein the upper end surface of the base is processed with a first arc-shaped ridge along its length direction, and the pressure rod is horizontally fixed to the pressure head of a press and is located directly above the patch tube, and the number of the fixing rods is an even number and they are arranged opposite to each other on the outside of the patch tube, and a second arc-shaped ridge is processed on a side surface of the fixing rod close to the patch tube, and both ends of the two oppositely arranged fixing rods are fixed by bolts, and the pressure rod, the first arc-shaped ridge and the second arc-shaped ridge are pressed one by one into a groove between each adjacent two lobes on the forming column.

[0007] Furthermore, the first arc-shaped ridge is vertically arranged opposite to the press rod.

[0008] Furthermore, the shape of the lower end surface of the profiled rod is the same as the shape of the first arc-shaped convex ridge.

[0009] Furthermore, the shape of the second arc-shaped ridge is the same as the shape of the first arc-shaped ridge.

[0010] Furthermore, the shape of the lower end surface of the press rod, the shape of the first arc-shaped convex ridge, and the shape of the second arc-shaped convex ridge are all the same as the shape of the concave surface between two adjacent petals on the shaping column.

[0011] Furthermore, the cross section of the base is U-shaped, the first arc-shaped ridge is arranged on the inner bottom end surface of the base, and the fixing rod is arranged between the side wall of the base and the compensation tube, and is matched with the gap of the side wall of the base.

[0012] Furthermore, two ends of the two oppositely arranged fixing rods are fixedly connected by two bolts respectively.

[0013] A shaping method using the shaping mold comprises the following steps:

[0014] Step 1: Place the base on the working platform of the press and fix the pressing rod on the pressing head of the press;

[0015] Step 2: Place the circular patching tube with the shaping column horizontally on the base, and set the two concave surfaces on the shaping column facing each other vertically and directly between the pressing rod and the first arc-shaped convex ridge, which is the pressing position;

[0016] Step 3: After heating the patch tube to the glass transition temperature Tg, start the press machine to control the pressure head to press down, so that the pressing rod presses the patch tube into the groove with an upward opening on the forming column, and at the same time, the first arc-shaped convex ridge presses the patch tube into the groove with an downward opening on the forming column;

[0017] Step 4: Maintain the pressing state and lower the temperature of the subsidized tube to below Tg, cool it to room temperature, and complete the pressing of the first pair of concave surfaces on the subsidized tube;

[0018] Step 5: Control the pressure head to rise, and then rotate the patch tube and the molding column simultaneously until the other two concave surfaces on the molding column that are arranged opposite to each other reach the molding position;

[0019] Step 6: Take two fixing rods, and place the second arc-shaped ridges on the two fixing rods in the two concave surfaces on both sides of the patch tube that have been successfully pressed, and fix the two ends of the two fixing rods with bolts;

[0020] Step 7: Repeat the operations of steps 3 and 4 to complete the pressing of the second pair of concave surfaces on the patching tube;

[0021] Step 8. Keep the fixed fixing rod in place and repeat steps 5 to 7 until all the concave surfaces on the patch tube are shaped.

[0022] Compared with the prior art, the present invention has the following effects:

[0023] The present application realizes the profiling of the patching pipe by using the profiling rod and the first arc-shaped ridge, and realizes the constraint of the profiling part by setting the fixing rod, which effectively prevents the occurrence of the heating rebound phenomenon. Compared with the prior art, the rebound rate after profiling is greatly reduced, thereby forming a blind spot-free fit between the patching pipe and the repaired pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the pipe after being shaped by a shaped column with a four-petal cross section;

[0026] Figure 3 It is a structural schematic diagram of the profiled rod;

[0027] Figure 4 is a schematic diagram of the structure of the base;

[0028] Figure 5 It is a schematic diagram of the structure of the solid rod. DETAILED DESCRIPTION

[0029] Specific implementation method 1: Combination Figures 1 to 5The present embodiment is described as a forming mold for a shape memory patching tube, which includes a forming column 1, a base 2 and a pressing rod 3. The forming column 1 is coaxially inserted into a horizontally arranged patching tube 100 and has a multi-petal cross-section. The patching tube 100 is horizontally arranged on the base 2. It also includes at least two fixing rods 4. The upper end face of the base 2 is processed with a first arc-shaped ridge 21 along its length direction. The pressing rod 3 is horizontally fixed to the pressure head of the press and is located directly above the patching tube 100. The number of the fixing rods 4 is an even number and they are arranged opposite to each other on the outside of the patching tube 100. A second arc-shaped ridge 41 is processed on a side of the fixing rod 4 close to the patching tube 100. Both ends of the two oppositely arranged fixing rods 4 are fixed by bolts 5. The pressing rod 3, the first arc-shaped ridge 21 and the second arc-shaped ridge 41 are pressed one by one into a groove between each adjacent two lobes on the forming column 1.

[0030] Shape memory composite materials have high elastic modulus and strength, good stability and reliability in the recovery process, large deformation recovery force and deformation rate, high recovery rate, low density and low cost. At the same time, various shaping can be performed according to the on-site conditions, and will not be restricted by on-site conditions. More importantly, it can meet various parameter requirements for operating conditions and repair without blind spots, thus achieving the purpose of repair to the greatest extent. A handle is fixedly connected to one end of the shaping column 1. There is a clearance fit between the shaping column 1 and the patch tube 100, so that the shaping column 1 can be smoothly removed from the patch tube 100 during and after shaping. The number of petals in the cross section of the shaping column 1 is an even number.

[0031] The base 2 is placed or reached on the workbench of the press. During the process of pressurizing and molding the subsidizing tube 100, since the pressure head of the press can only move up and down, if the subsidizing tube 100 is to be pressed into the shape of the molding column 1, the best way is to choose symmetrical pressurization and molding. During the molding process, the subsidizing tube 100 can only be pressurized and molded when it is heated to above the glass transition temperature Tg.

[0032] The present application realizes the constraint of the pressed part by setting a fixing rod 4, and effectively prevents the occurrence of heating rebound phenomenon. For example, if the cross-sectional shape of the forming column 1 is a four-petal shape, two concave surfaces symmetrical up and down are pressed out by the pressing rod 3 on the press and the first arc-shaped ridge 21 on the base 2. After the temperature drops below Tg and is maintained for a period of time, the subsidizing tube 100 and the forming column 1 are rotated at the same time, and the two fixing rods 4 are used to fix the pressed concave surface, and tightened with bolts 5 to prevent the formed concave surface from rebounding during the process of heating and pressurizing the forming. The external fixed limiting effect of the fixing rod 4 can effectively ensure that the outer diameter of the deformed subsidizing tube 100 is smaller than the inner diameter of the repaired pipe, so that the subsidizing tube 100 can be smoothly installed at the position required to be repaired on the pipe to be repaired.

[0033] After the subsidizing tube 100 is installed at the designated position, it is heated to Tg, thereby unlocking the subsidizing tube 100 so that it gradually returns to its initial state, thereby forming a completely blind-spot-free fit to the damaged part of the transmission pipeline.

[0034] The first arc-shaped ridge 21 is arranged vertically opposite to the pressing rod 3 to ensure that the force on the patching tube 100 is uniform during the pressing process.

[0035] The shape of the lower end surface of the pressing rod 3 is the same as the shape of the first arc-shaped ridge 21, so that the concave shape pressed out on the patching tube 100 is the same.

[0036] The shape of the second arc-shaped ridge 41 is the same as that of the first arc-shaped ridge 21, so that the fixing rod 4 is closely fitted with the concave surface pressed out on the patching tube 100 to achieve better fixing.

[0037] The shape of the lower end surface of the pressing rod 3 , the shape of the first arcuate ridge 21 , and the shape of the second arcuate ridge 41 are all the same as the shape of the concave surface between two adjacent petals on the shaping column 1 .

[0038] The cross section of the base 2 is U-shaped, the first arc-shaped ridge 21 is arranged on the inner bottom end surface of the base 2, and the fixing rod 4 is arranged between the side wall of the base 2 and the patch tube 100, and is matched with the side wall of the base 2. The two side walls of the base 2 play a preliminary limiting role for the fixing rod 4, which facilitates the connection and tightening of the bolts 5 between the two oppositely arranged fixing rods 4.

[0039] The two ends of the two oppositely arranged fixing rods 4 are respectively fixedly connected by two bolts 5. The connection stability between the two fixing rods 4 is ensured to prevent the heating rebound of the patching tube 100.

[0040] A shaping method using the shaping mold comprises the following steps:

[0041] Step 1: Place the base 2 on the working platform of the press, and fix the pressing rod 3 on the pressing head of the press;

[0042] Step 2: Place the circular patching tube 100 with the shaping column 1 horizontally on the base 2, and set the two concave surfaces on the shaping column 1 facing each other vertically between the pressing rod 3 and the first arc-shaped convex ridge 21, which is the pressing position;

[0043] Step 3: After heating the patch tube 100 to the glass transition temperature Tg, start the press machine to control the pressure head to press down, so that the pressing rod 3 presses the patch tube 100 into the groove with an upward opening on the forming column 1, and at the same time, the first arc-shaped convex ridge 21 presses the patch tube 100 into the groove with an downward opening on the forming column 1;

[0044] Step 4: Maintain the pressing state and reduce the temperature of the subsidizing tube 100 to below Tg, cool to room temperature, and complete the pressing of the first pair of concave surfaces on the subsidizing tube 100;

[0045] Step 5: Control the pressure head to rise, and then rotate the patching tube 100 and the shaping column 1 simultaneously until the other two concave surfaces on the shaping column 1 that are arranged opposite to each other reach the shaping position;

[0046] Step 6: Take two fixing rods 4, and place the second arc-shaped ridges 41 on the two fixing rods 4 in the two concave surfaces on both sides of the patch tube 100 that have been successfully pressed, and fix the two ends of the two fixing rods 4 with bolts 5;

[0047] Step 7: Repeat the operations of steps 3 and 4 to complete the pressing of the second pair of concave surfaces on the patching tube 100;

[0048] Step 8: The fixed fixing rod 4 remains in position and the operations of steps 5 to 7 are repeated until all the concave surfaces on the patching tube 100 are formed.

Claims

1. A shaping mold for a shape memory patch tube, comprising a shaping column (1), a base (2) and a pressing rod (3), wherein the shaping column (1) is coaxially arranged in a horizontally arranged patch tube (100) and has a multi-petal cross section, and the patch tube (100) is horizontally arranged on the base (2), characterized in that: It also includes at least two fixing rods (4), the upper end surface of the base (2) is processed with a first arcuate ridge (21) along its length direction, the pressing rod (3) is horizontally fixed to the pressure head of the press and is located directly above the subsidizing tube (100), the number of the fixing rods (4) is an even number and they are arranged opposite to each other on the outside of the subsidizing tube (100), a second arcuate ridge (41) is processed on a side surface of the fixing rod (4) close to the subsidizing tube (100), both ends of the two oppositely arranged fixing rods (4) are fixedly connected by bolts (5), the pressing rod (3), the first arcuate ridge (21) and the second arcuate ridge (41) are pressed one by one into a groove between each adjacent two petals on the shaping column (1), the shaping column (1) and the subsidizing tube (100) are clearance-fitted, and a handle is fixedly connected to one end of the shaping column (1).

2. A shaping mold for a shape memory patch tube according to claim 1, characterized in that: The first arc-shaped ridge (21) is vertically arranged opposite to the press rod (3).

3. The forming mold for the shape memory patch tube according to claim 2, characterized in that: The shape of the lower end surface of the profiled rod (3) is the same as the shape of the first arc-shaped ridge (21).

4. The forming mold for the shape memory patch tube according to claim 3, characterized in that: The shape of the second arc-shaped ridge (41) is the same as the shape of the first arc-shaped ridge (21).

5. A shaping die for a shape memory patch tube according to claim 1, 2, 3 or 4, characterized in that: The shape of the lower end surface of the profiled rod (3), the shape of the first arcuate ridge (21), and the shape of the second arcuate ridge (41) are all the same as the shape of the concave surface between two adjacent petals on the profiled column (1).

6. The forming mold for the shape memory patch tube according to claim 5, characterized in that: The cross section of the base (2) is U-shaped, the first arc-shaped ridge (21) is arranged on the inner bottom end surface of the base (2), and the fixing rod (4) is arranged between the side wall of the base (2) and the patch tube (100), and is gap-matched with the side wall of the base (2).

7. A shaping die for a shape memory patch tube according to claim 1, 2, 3, 4 or 6, characterized in that: The two ends of the two oppositely arranged fixing rods (4) are fixedly connected by two bolts (5) respectively.

8. The shaping method of the shaping mold according to any one of claims 1 to 7, characterized in that: It includes the following steps: Step 1: Place the base (2) on the working platform of the press, and fix the pressing rod (3) on the pressing head of the press; Step 2: Place the circular patch tube (100) with the shaping column (1) horizontally on the base (2), and arrange the two concave surfaces on the shaping column (1) facing each other vertically between the pressing rod (3) and the first arc-shaped convex ridge (21), which is the pressing position; Step 3: After heating the subsidizing tube (100) to the glass transition temperature Tg, start the press machine to control the pressing head to press downward, so that the pressing rod (3) presses the subsidizing tube (100) into the groove with an upward opening on the shaping column (1), and at the same time, the first arc-shaped convex ridge (21) presses the subsidizing tube (100) into the groove with an upward opening on the shaping column (1); Step 4: maintaining the pressing state and lowering the temperature of the subsidizing tube (100) to below Tg, cooling to room temperature, and completing the pressing of the first pair of concave surfaces on the subsidizing tube (100); Step 5: Control the pressure head to rise, and then rotate the compensating tube (100) and the shaping column (1) simultaneously until the other two concave surfaces on the shaping column (1) that are arranged opposite to each other reach the shaping position; Step 6: Take two fixing rods (4), and place the second arc-shaped ridges (41) on the two fixing rods (4) in a corresponding manner in the two concave surfaces on both sides of the patch tube (100) that have been successfully pressed, and fix the two ends of the two fixing rods (4) by bolts (5); Step 7: Repeat the operations of steps 3 and 4 to complete the pressing of the second pair of concave surfaces on the patching tube (100); Step 8: The fixed fixing rod (4) remains in position and the operations of steps 5 to 7 are repeated until all the concave surfaces on the patching tube (100) are shaped.

Images