Method for assembling and disassembling sheath from pipe

Abstract

The invention relates to the technical field of pipe protection, and discloses a method for assembling and disassembling a sheath from a pipe, which comprises the following steps of: pipe pressure test and sheath installation: clamping the pipe by a first clamping cylinder, pushing the sheath into a preparation groove by a transposition cylinder, clamping the sheath by a pushing cylinder, moving the sheath towards the pipe, and installing the sheath at the end part of the pipe; after the surface treatment is completed, the pipe is conveyed to a sheath removing procedure; when the pipe reaches the sheath removing station, the output end of the jacking air cylinder is connected with the sheath in a clamped mode, the second clamping air cylinder clamps the pipe, and the pushing air cylinder drives the second clamping air cylinder to move backwards, so that the pipe is driven to move backwards, and the pipe is separated from the sheath. Through cooperation of the first clamping air cylinder and the pushing air cylinder, the protective sleeve is installed on the pipe, foreign matter is prevented from entering the pipe, the requirement for cleanliness of the interior of the pipe is met, through cooperation of the jacking air cylinder, the second clamping air cylinder and the pushing air cylinder, the protective sleeve is separated from the pipe, the assembling efficiency is improved, and the labor cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe protection, and particularly relates to a method for installing and removing a sheath for a pipe. Background Art

[0002] When performing surface treatment such as sandblasting on the outer wall of a heat exchange tube, in order to prevent impurities from entering the heat exchange tube to ensure the cleanliness inside the heat exchange tube, before processing, it is necessary to manually install a sheath at the end of the heat exchange tube, and after the sandblasting is completed, manually remove the sheath. The processes of installing and removing the sheath not only require a lot of labor but also affect the processing efficiency of the heat exchange tube. Summary of the Invention

[0003] The present invention provides a method for installing and removing a sheath for a pipe in view of the existing technical problems.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: A method for installing and removing a sheath for a pipe includes the following steps: Step S1, pipe pressure test: Perform a pressure test on the pipe. If the pressure test is qualified, execute the sheath installation process; if not, do not execute the sheath installation process. Step S2, sheath installation: When the sensor detects that the pipe reaches the specified position, the first clamping cylinder clamps the pipe, the transposition cylinder pushes the sheath in the temporary storage tank into the preparation tank, the propulsion cylinder clamps the sheath and moves the sheath towards the pipe, and installs the sheath at the end of the pipe. Step S3, repeat Step S2 to install another sheath at the other end of the pipe. Step S4, surface treatment of the pipe: Transport the pipe to the surface treatment process, perform surface treatment on the pipe, and after the surface treatment is completed, transport the pipe to the sheath removal process. Step S5, sheath removal: When the pipe reaches the sheath removal station, the output end of the lifting cylinder engages with the sheath, the second clamping cylinder clamps the pipe through the jaws, the pushing cylinder drives the second clamping cylinder to move backward, thereby driving the pipe to move backward and separating the pipe from the sheath. Step S6, repeat Step S5 to remove the sheath at the other end of the pipe.

[0005] On the basis of the above technical solution, the present invention can also be improved as follows: Preferably, there is also Step S10 between Step S1 and Step S2. Transport the pipe to the pressure test device. The pressure test device includes a rotating shaft, a mounting plate, and a pressure test head. The rotating shaft is connected to a driving source. A plurality of mounting plates are circumferentially installed on the rotating shaft. A plurality of pressure test heads are installed on the mounting plate. The pressure test heads are communicated with a gas source through a pipeline. The positions of the pressure test heads correspond to the positions of the pipes.

[0006] Preferably, there is a step S11 between step S10 and step S2, in which a plurality of pipes are pressure-tested simultaneously through a plurality of high-pressure valves. If the pressure test is qualified, the pipes are transported to the jacket installation process, and the condition of the high-pressure valves is tested. Each time a high-pressure valve detects a signal, the qualified number count is increased by one; If the pressure test fails, a single pipe pressure test will be performed. If the single pipe pressure test passes, the pipe will be transported to the sheath installation process and the qualified count will be increased by one; if the single pipe pressure test fails, the unqualified count will be increased by one.

[0007] Preferably, the transposition cylinder and the propulsion cylinder are arranged at 90 degrees, and the preparatory groove is a U-shaped groove with an opening facing upward.

[0008] Preferably, the output end of the lifting cylinder is provided with a U-shaped groove, and the diameter of the U-shaped groove is larger than the outer diameter of the pipe and smaller than the outer diameter of the sheath.

[0009] Preferably, step S7 is also included after step S6, unloading: the output end of the pushing cylinder is connected to a pushing plate, the top surface of the pushing plate is an inclined surface, and the pushing cylinder pushes the pushing plate to move upward, thereby pushing the pipe out of the U-shaped groove and transporting the pipe to the next process.

[0010] The beneficial effects of the present invention are as follows: after the pressure test, the sheath is installed on the pipe through the cooperation of the first clamping cylinder and the pushing cylinder, and then the pipe is surface treated to prevent foreign matter from entering the pipe, ensuring that the cleanliness of the pipe meets the requirements. After the surface treatment, the pipe is transported to the sheath removal station, and the sheath is automatically removed from the pipe through the cooperation of the lifting cylinder, the second clamping cylinder and the pushing cylinder, thereby realizing unmanned and fully automatic installation or removal of the sheath on the pipe, improving assembly efficiency and saving labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic top view of the installation of the sheath in the present invention; Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle; Figure 3 for Figure 1 A magnified schematic diagram of point B in the middle; Figure 4 It is a schematic diagram of the lifting cylinder, the second clamping cylinder and the pushing cylinder in the present invention.

[0012] The reference numerals are recorded as follows: 1. First clamping cylinder; 2. Temporary storage tank; 3. Preparation tank; 4. Transposition cylinder; 5. Pushing cylinder; 6. Positioning groove; 7. Sheath; 8. Pipe; 9. Lifting cylinder; 10. U-shaped groove; 11. Second clamping cylinder; 12. Pushing cylinder; 13. Rotating shaft; 14. Mounting plate; 15. Pressure test head; 16. Third clamping cylinder; 17. Feeding pipe; 18. Pushing material cylinder; 19. Pushing plate; 20. Conveyor motor; 21. Conveyor wheel. Detailed implementation manners

[0013] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0014] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. The orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0015] As Figures 1 to 4 shown, the present invention discloses a method for installing and removing a sheath from a pipe, including the following steps: Step S1, pressure testing of the pipe 8: The pipe 8 is pressure tested. If the pressure test is qualified, the process of installing the sheath 7 is performed; if not, the process of installing the sheath 7 is not performed. Step S10, conveying the pipe 8 to the pressure testing device. The pressure testing device includes a rotating shaft 13, a mounting plate 14, and a pressure test head 15. The rotating shaft 13 is connected to a driving source, and the driving source can be a driving motor or a rotating power cylinder. The driving source drives the rotating shaft 13 to rotate. A plurality of mounting plates 14 are circumferentially installed on the rotating shaft 13. The mounting plates 14 are U-shaped. A plurality of pressure test heads 15 are installed on each mounting plate 14. The pressure test heads 15 are communicated with a gas source through a pipeline, and a high-pressure valve is installed on the pipeline. The position of the pressure test heads 15 corresponds to the position of the pipe 8. During the pressure test, the third clamping cylinder 16 clamps the pipe 8, and the pressure test heads 15 are inserted into the pipe 8 for pressure testing.

[0016] Among them, various types of pressure test heads 15 with different sizes can be installed on multiple mounting plates 14, so as to meet the pressure test requirements of pipes 8 with different sizes and improve the convenience of use.

[0017] Step S11: Simultaneously perform pressure tests on multiple pipes 8 through multiple high-pressure valves. The high-pressure valves control the on-off of high-pressure gas. The high-pressure valves are connected to a high-pressure gas source through pipelines and are also connected to pressure measuring instruments. Pressure detection is carried out through the pressure measuring instruments. If the pressure test is qualified, the pipes 8 are conveyed to the installation sheath process, and the conditions of the high-pressure valves are detected. For each high-pressure valve that detects a signal, the qualified number count is incremented by one. If the pressure test is unqualified, single-pipe pressure test is performed. If a single pipe 8 passes the pressure test, the pipe 8 is conveyed to the installation sheath process, and the qualified count is incremented by one. If a single pipe 8 fails the pressure test, the unqualified count is incremented by one. By performing pressure tests on single pipes 8, the situation of misjudgment is avoided, and the accuracy of the pressure test is improved.

[0018] Among them, the qualified count represents the number of qualified heat exchange pipes, and the unqualified count represents the number of unqualified heat exchange pipes. For each heat exchange pipe, a sheath replacement action needs to be performed. When the sum of the qualified count and the unqualified count is equal to the sheath replacement action count, it means that there are no more heat exchange pipes on the device, and the next batch of pressure tests can be carried out. That is, when the replacement action count of the sheath 7 is equal to the pressure test count, the blanking screening solenoid valve acts, and then the sheath replacement solenoid valve acts. After a delay of 1 s, the blanking screening solenoid valve and the sheath replacement solenoid valve are reset.

[0019] Step S2: Install the sheath 7. When the sensor detects that the pipe 8 reaches the specified position, at this time, the pipe 8 is located in the U-shaped positioning groove 6 with an upward opening. The first clamping cylinder 1 is located on one side of the positioning groove 6. The first clamping cylinder 1 clamps the pipe 8. Sheath installation components are provided at both ends of the pipe 8. The sheath installation components include a temporary storage groove 2, a preparation groove 3, a replacement cylinder 4, and a propulsion cylinder 5. A sheath 7 is placed in the temporary storage groove 2. The temporary storage groove 2 is square in shape, and its inner wall is provided with a semi-circular groove for accommodating the sheath 7. The length and diameter of the semi-circular groove are both larger than the sheath 7. The replacement cylinder 4 is arranged on one side of the temporary storage groove 2. The replacement cylinder 4 pushes the sheath 7 from the temporary storage groove 2 into the preparation groove 3. The propulsion cylinder 5 is located at one end of the preparation groove 3, and the pipe 8 is located at the other end of the preparation groove 3. The propulsion cylinder 5 clamps the sheath 7 in the preparation groove 3 and pushes the sheath 7 towards the pipe 8 to install the sheath 7 on the pipe 8, and at the same time, the sheath replacement action count is incremented by one. In this embodiment, the replacement cylinder 4 and the propulsion cylinder 5 are arranged at a 90° angle, and the preparation groove 3 is a U-shaped groove with an upward opening, which is convenient for the replacement cylinder 4 to push the sheath 7 into the preparation groove 3.

[0020] Further, a plurality of sheaths 7 are arranged in the loading pipe 17. One end of the loading pipe 17 is provided with a blowing pipe, on which a blowing solenoid valve is arranged. The blowing pipe is communicated with an air compressor. By controlling the blowing solenoid valve to blow air into the loading pipe 17, the sheaths 7 in the loading pipe 17 are gradually conveyed to the temporary storage tank 2, realizing the automatic loading of the sheaths 7 and further improving the working efficiency.

[0021] Step S3: Repeat step S2, and install another sheath 7 at the other end of the pipe 8. Step S4: Perform surface treatment on the pipe 8. In this embodiment, sandblasting treatment is performed on the pipe 8. After the sandblasting treatment is completed, the pipe 8 is conveyed to the sheath removal process. Step S5: Remove the sheath 7. When the photoelectric switch detects that the pipe 8 reaches the sheath removal station, the output end of the lifting cylinder 9 is provided with a U-shaped groove 10. The lifting cylinder 9 clamps the sheath 7 through the U-shaped groove 10. Specifically, the diameter of the U-shaped groove 10 is larger than the outer diameter of the pipe 8 and smaller than the outer diameter of the sheath 7. The pipe 8 can pass through the U-shaped groove 10, but the sheath 7 will be stuck by the U-shaped groove 10. The second clamping cylinder 11 clamps the pipe 8 through the claws, and the pushing cylinder 12 drives the second clamping cylinder 11 to move, thereby driving the pipe 8 to move. Since the sheath 7 is stuck by the U-shaped groove 10, the separation of the pipe 8 and the sheath 7 is realized. Further, a conveying motor 20 is installed on the frame of the sheath removal station. The conveying motor 20 is connected to a plurality of rollers through a transmission belt or a transmission chain. The rollers are rotatably installed on the frame through bearings, and a conveying wheel 21 is installed on each roller. When the conveying motor 20 works, it drives the conveying wheel 21 to rotate, thereby driving the pipe 8 to move along Figure 4 the direction of the arrow in the figure, realizing the adjustment of the position of the pipe 8, so as to facilitate the separation of the sheath 7 and the pipe 8 by the U-shaped groove 10 and improve the convenience of use.

[0022] Step S6: Repeat step S5 to remove the sheath 7 at the other end of the pipe 8.

[0023] Step S7: Unloading: Specifically, a pushing cylinder 18 is also installed on the frame. The output end of the pushing cylinder 18 is connected with a pushing plate 19. The pushing plate 19 is arranged along the width direction of the frame, and the top surface of the pushing plate 19 is an inclined surface. After the pipe 8 completes the action of removing the sheath 7, the pushing cylinder 18 pushes the pushing plate 19 to move upward, thereby pushing the pipe 8 out of the U-shaped groove 10 and conveying the pipe 8 to the next process.

[0024] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for installing and removing a sheath on a pipe, characterized in that: The following steps are involved: Step S1, pipe pressure test: the pipe (8) is pressure tested. If the pressure test is qualified, the sheath installation process is performed. If it is unqualified, the sheath installation process is not performed. Step S2, installing the sheath: when the sensor detects that the pipe (8) reaches the designated position, the first clamping cylinder (1) clamps the pipe (8), the shifting cylinder (4) pushes the sheath (7) in the temporary storage tank (2) into the preparatory tank (3), the propulsion cylinder (5) clamps the sheath (7) and moves the sheath (7) toward the pipe (8), and the sheath (7) is installed on the end of the pipe (8); Step S3, repeating step S2, installing another sheath (7) on the other end of the pipe (8); Step S4, performing surface treatment on the pipe: transporting the pipe (8) to a surface treatment process, performing surface treatment on the pipe (8), and after the surface treatment is completed, transporting the pipe (8) to a sheath removal process; Step S5, removing the sheath: when the pipe (8) reaches the sheath removing station, the output end of the lifting cylinder (9) clamps the sheath (7), the second clamping cylinder (11) clamps the pipe (8) through the claws, and the pushing cylinder (12) drives the second clamping cylinder (11) to move backward, thereby driving the pipe (8) to move backward, and separating the pipe (8) from the sheath (7); Step S6, repeat step S5 to remove the sheath (7) at the other end of the pipe (8).

2. The method for installing and removing the sheath of the pipe according to claim 1, characterized in that, There is a step S10 between step S1 and step S2, in which the pipe (8) is transported to a pressure test device, wherein the pressure test device comprises a rotating shaft (13), a mounting plate (14) and a pressure test head (15), wherein the rotating shaft (13) is connected to a driving source, a plurality of mounting plates (14) are mounted circumferentially on the rotating shaft (13), a plurality of pressure test heads (15) are mounted on the mounting plates (14), and the pressure test heads (15) are connected to an air source through a pipeline, and the position of the pressure test heads (15) corresponds to the position of the pipe (8).

3. The method for installing and removing the sheath of the pipe according to claim 2, wherein, Between step S10 and step S2, there is a step S11, in which a plurality of pipes (8) are pressure-tested simultaneously through a plurality of high-pressure valves. If the pressure test is qualified, the pipes (8) are transported to the jacket installation process, and the condition of the high-pressure valves is detected. Each time a high-pressure valve detects a signal, the qualified number count is increased by one; If the pressure test fails, a single-tube pressure test is performed. If the single pipe (8) passes the pressure test, the pipe (8) is transported to the jacket installation process, and the qualified count is increased by one; if the single pipe (8) fails the pressure test, the unqualified count is increased by one.

4. The method for installing and removing a sheath on a pipe according to claim 1, characterized in that: In step S2, the transposition cylinder (4) and the propulsion cylinder (5) are arranged at 90 degrees, and the preparatory groove (3) is a U-shaped groove with an opening facing upward.

5. The method for installing and removing a sheath on a pipe according to claim 1, characterized in that: In step S5, a U-shaped groove (10) is provided at the output end of the lifting cylinder (9), and the diameter of the U-shaped groove (10) is larger than the outer diameter of the pipe (8) and smaller than the outer diameter of the sheath (7).

6. The method for installing and removing a sheath on a pipe according to claim 5, characterized in that: After step S6, step S7 is also included, unloading: the output end of the pushing cylinder (18) is connected to the pushing plate (19), the top surface of the pushing plate (19) is an inclined surface, and the pushing cylinder (18) pushes the pushing plate (19) to move upward, thereby pushing the pipe (8) out of the U-shaped groove (10) and transporting the pipe (8) to the next process.

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