Method for installing and removing sheath of pipe

Abstract

The present invention relates to the technical field of pipe protection, and discloses a method for installing and removing a sheath on a pipe, comprising the following steps: pipe pressure testing, and installing a sheath: a first clamping cylinder clamps the pipe, a shifting cylinder pushes the sheath into a preparatory groove, a propulsion cylinder clamps the sheath and moves the sheath toward the pipe, and installs the sheath at the end of the pipe; after surface treatment is completed, the pipe is transported to a sheath removal process; when the pipe arrives at the sheath removal station, the output end of the lifting cylinder clamps the sheath, the second clamping cylinder clamps the pipe, and the propulsion cylinder drives the second clamping cylinder to move backward, thereby driving the pipe to move backward and separate the pipe from the sheath. Through the cooperation of the first clamping cylinder and the propulsion cylinder, the sheath is installed on the pipe, foreign matter is prevented from entering the pipe, and the requirements for internal cleanliness of the pipe are met. Through the cooperation of the lifting cylinder, the second clamping cylinder, and the propulsion cylinder, the sheath is removed from the pipe, thereby improving assembly efficiency and saving labor costs.

Description

Technical Field

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

[0002] When performing surface treatment on the outer wall of a heat exchange tube, such as sandblasting, a jacket must be manually installed on the end of the tube to prevent impurities from entering the tube and ensure internal cleanliness. After the sandblasting is complete, the jacket must be manually removed. The jacket installation and removal process not only requires a lot of labor but also affects the processing efficiency of the heat exchange tube. Summary of the Invention

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

[0004] The present invention solves the above technical problems with the following technical solutions: A method for installing and removing a sheath on a pipe comprises the following steps:

[0005] Step S1, pipe pressure test: the pipe is pressure tested. If the pressure test is qualified, the sheath installation process is carried out; if it is unqualified, the sheath installation process is not carried out;

[0006] Step S2, installing the sheath: When the sensor detects that the pipe has reached the designated position, the first clamping cylinder clamps the pipe, the shifting cylinder pushes the sheath in the temporary storage tank into the preparatory tank, and the advancing cylinder clamps the sheath and moves it toward the pipe, installing the sheath at the end of the pipe;

[0007] Step S3, repeating step S2 to install another sheath on the other end of the pipe;

[0008] Step S4, performing surface treatment on the pipe: the pipe is transported to the surface treatment process, and the surface treatment is performed on the pipe. After the surface treatment is completed, the pipe is transported to the de-sheathing process;

[0009] Step S5, sheath removal: When the pipe reaches the sheath removal station, the output end of the lifting cylinder clamps the sheath, and the second clamping cylinder clamps the pipe through the claws. The pushing cylinder drives the second clamping cylinder to move backward, thereby driving the pipe backward to separate the pipe from the sheath;

[0010] Step S6, repeat step S5 to remove the sheath at the other end of the pipe.

[0011] On the basis of the above technical solution, the present invention can also make the following improvements:

[0012] Preferably, there is a step S10 between step S1 and step S2, in which the pipe is transported to a pressure testing device, wherein the pressure testing device includes a rotating shaft, a mounting plate and a pressure testing head, wherein the rotating shaft is connected to a driving source, a plurality of mounting plates are circumferentially mounted on the rotating shaft, a plurality of pressure testing heads are mounted on the mounting plates, the pressure testing heads are connected to an air source through a pipeline, and the position of the pressure testing heads corresponds to the position of the pipe.

[0013] 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;

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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

[0019] Figure 1 A schematic top view of the installation of the sheath in the present invention;

[0020] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0021] Figure 3 for Figure 1 A magnified schematic diagram of point B in the middle;

[0022] Figure 4 It is a schematic diagram of the lifting cylinder, the second clamping cylinder and the pushing cylinder in the present invention.

[0023] The accompanying drawings are marked as follows: 1. First clamping cylinder; 2. Temporary storage tank; 3. Preparation tank; 4. Transposition cylinder; 5. Propulsion cylinder; 6. Positioning tank; 7. Sheath; 8. Pipe; 9. Lifting cylinder; 10. U-shaped tank; 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 cylinder; 19. Pushing plate; 20. Conveying motor; 21. Conveying wheel. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first," "second," and so forth in the specification and claims of the present invention, as well as in the accompanying drawings, are used to distinguish similar objects and are not necessarily intended to describe a specific order or sequence. Terms such as "vertical," "upper," "lower," and "horizontal" indicate positions or relationships based on those shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0026] like Figures 1 to 4 As shown, the present invention discloses a method for installing and removing a sheath on a pipe, comprising the following steps:

[0027] Step S1, pressure test of pipe 8: pressure test is performed on pipe 8. If the pressure test is qualified, the sheath installation step 7 is performed; if it is unqualified, the sheath installation step 7 is not performed;

[0028] In step S10, the pipe 8 is transported to a pressure test device, which 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, which can be a driving motor or a rotary power cylinder. The driving source drives the rotating shaft 13 to rotate. Multiple mounting plates 14 are circumferentially mounted on the rotating shaft 13. The mounting plates 14 are U-shaped, and each mounting plate 14 is mounted with multiple pressure test heads 15. The pressure test heads 15 are connected to the air 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 head 15 is inserted into the pipe 8 to perform the pressure test.

[0029] Among them, multiple pressure test heads 15 of different sizes can be installed on the multiple mounting plates 14, so as to meet the pressure test requirements of pipes 8 of different sizes and improve the convenience of use.

[0030] Step S11: Pressure testing is performed on multiple pipes 8 simultaneously 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 a pipeline and to a pressure measuring instrument. Pressure testing is performed using the pressure measuring instrument. If the pressure test is qualified, the pipes 8 are transported to the jacket installation process, and the high-pressure valves are tested. Each time a high-pressure valve detects a signal, the qualified number count is incremented by one.

[0031] 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 sheath 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; by pressure testing a single pipe 8, misjudgment is avoided and the accuracy of the pressure test is improved.

[0032] The "Qualified Count" indicates the number of qualified heat exchange tubes, while the "Unqualified Count" indicates the number of unqualified tubes. Each heat exchange tube requires a jacket swap. When the sum of the "Qualified Count" and the "Unqualified Count" equals the "Jacket Swapping Count," the device is free of heat exchange tubes and the next batch of pressure tests can proceed. Specifically, when the "Jacket 7" swapping count equals the pressure test count, the unloading and screening solenoid valve activates, followed by the jacket swapping solenoid valve. After a 1-second delay, both the unloading and screening solenoid valves reset.

[0033] Step S2, installing the sheath 7: When the sensor detects that the pipe 8 has reached the specified position, the pipe 8 is located in the U-shaped positioning groove 6 with the opening facing upward, and the first clamping cylinder 1 is located on one side of the positioning groove 6. The first clamping cylinder 1 clamps the pipe 8. Both ends of the pipe 8 are provided with a sheath installation assembly, which includes a temporary storage groove 2, a preparatory groove 3, a shifting cylinder 4 and a propulsion cylinder 5. The sheath 7 is placed in the temporary storage groove 2. The temporary storage groove 2 is square in shape and has a semicircular inner wall. The groove is a semicircular groove for accommodating the sheath 7. The length and diameter of the semicircular groove are both larger than the sheath 7. The transposition cylinder 4 is arranged on one side of the temporary storage groove 2. The transposition cylinder 4 pushes the sheath 7 from the temporary storage groove 2 to the preparatory groove 3. The propulsion cylinder 5 is located at one end of the preparatory groove 3. The pipe 8 is located at the other end of the preparatory groove 3. The propulsion cylinder 5 clamps the sheath 7 in the preparatory groove 3 and pushes the sheath 7 toward the pipe 8 to install the sheath 7 on the pipe 8. At the same time, the sheath 7 transposition action count is increased by one.

[0034] In this embodiment, the shift 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 upward, which makes it convenient for the shift cylinder 4 to push the sheath 7 into the preparatory groove 3.

[0035] Furthermore, multiple sheaths 7 are arranged in a feeding pipe 17, and a blowing pipe is provided at one end of the feeding pipe 17. A blowing solenoid valve is provided on the blowing pipe. The blowing pipe is connected to the air compressor, and the blowing solenoid valve controls the blowing pipe to blow air into the upper feeding pipe 17, so that the sheaths 7 in the feeding pipe 17 are gradually transported to the temporary storage tank 2, thereby realizing automatic loading of the sheaths 7 and further improving work efficiency.

[0036] Step S3, repeating step S2, installing another sheath 7 on the other end of the pipe 8;

[0037] Step S4, performing surface treatment on the pipe 8. In this embodiment, the pipe 8 is sandblasted. After the sandblasting is completed, the pipe 8 is transported to the sheath removal process;

[0038] Step S5, removing the sheath 7: The photoelectric switch detects that the pipe 8 has reached the sheath removal station. The output end of the lifting cylinder 9 is provided with a U-shaped groove 10. The lifting cylinder 9 engages 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 in the U-shaped groove 10. The second clamping cylinder 11 clamps the pipe 8 with its claws. The push cylinder 12 drives the second clamping cylinder 11 to move, thereby driving the pipe 8 to move. Since the sheath 7 is stuck in the U-shaped groove 10, the pipe 8 is separated from the sheath 7.

[0039] Furthermore, 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. A conveying wheel 21 is installed on each roller. When the conveying motor 20 is working, the conveying wheel 21 is driven to rotate, thereby driving the pipe 8 along the Figure 4 Move in the direction of the middle arrow to adjust the position of the pipe 8 so that the U-shaped groove 10 can separate the sheath 7 from the pipe 8, thereby improving the convenience of use.

[0040] Step S6, repeat step S5 to remove the sheath 7 at the other end of the pipe 8.

[0041] Step S7, unloading: Specifically, a pushing cylinder 18 is also installed on the frame, and the output end of the pushing cylinder 18 is connected to 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.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection 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 S10, transporting the pipe (8) to a pressure test device, the pressure test device comprising a rotating shaft (13), a mounting plate (14) and a pressure test head (15), the rotating shaft (13) being connected to a driving source, a plurality of mounting plates (14) being mounted circumferentially on the rotating shaft (13), a plurality of pressure test heads (15) being mounted on the mounting plates (14), the pressure test heads (15) being connected to an air source via a pipeline, and the position of the pressure test heads (15) corresponding to the position of the pipe (8); 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 installs the sheath (7) on the end of the pipe (8), the shifting cylinder (4) and the propulsion cylinder (5) are arranged at 90 degrees, and the preparatory tank (3) is a U-shaped tank with an opening upward; 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), and the output end of the lifting cylinder (9) is provided with a U-shaped groove (10), 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 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 a sheath on a pipe according to claim 1, characterized in that: 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.

3. The method for installing and removing a sheath on a pipe according to claim 1, 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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