Deep cleaning system and method for sintered epoxy powder inner coating surface of steel pipe

Abstract

The invention relates to the field of steel pipeline sintering epoxy powder internal coating, in particular to a steel pipe sintering epoxy powder internal coating surface deep cleaning system which comprises a control unit, a supporting vibration unit, a degaussing unit and a scanning suction unit. The supporting vibration unit is used for fixing the steel pipe on one hand, and continuously vibrating the steel pipe in the cleaning process under the scheduling of the control unit on the other hand, so that scrap iron in the steel pipe moves towards the bottom of the steel pipe under the action of gravity. The degaussing unit degausses the steel pipe under the control of the control unit, so that the attraction force between the scrap iron and the steel pipe is eliminated, and the moving speed of the scrap iron towards the bottom of the steel pipe is increased. The scanning suction unit moves along the interior of the steel pipe, scans the bottom of the steel pipe and sucks scrap iron located at the bottom of the steel pipe, and cleaning work of the steel pipe is completed. The invention also comprises a method. The steel pipe cleaning device can enter steel pipes where workers cannot enter, demagnetization, vibration and vacuum suction are combined, automatic cleaning is completed, the working efficiency is high, and the cleaning effect is excellent.

Description

Technical Field

[0001] The invention relates to the field of fusion bonded epoxy powder internal coating of steel pipes, in particular to a system and method for deep cleaning the surface of fusion bonded epoxy powder internal coating of steel pipes. Background Art

[0002] Fusion-bonded epoxy powder coating is the mainstream technology for steel pipeline protection. Prior to fusion-bonded epoxy powder coating, the painted surface of the steel pipe must be derusted by spraying to achieve a surface finish of SA2.5 and an anchor mark depth of 40 to 100µm. Derusting quality is a key factor affecting the quality of fusion-bonded epoxy powder coating. In actual production, poor derusting often results in substandard coating adhesion and leaks, leading to coating rejection and financial losses for the processing company. The primary cause of substandard rust removal for fusion-bonded epoxy powder coatings is inadequate removal of iron oxide particles and dust deposited on the painted surface after derusting. For small and medium-sized steel pipes with a diameter of less than 508mm, derusting and dust removal by spraying is primarily accomplished with high-pressure air purging. However, due to the obstruction of anchor marks and the residual magnetic attraction of the steel pipe, the iron oxide particles and dust generated by derusting during spraying are difficult to completely remove from the painted surface. In addition, for small and medium diameter steel pipes with a diameter of less than 508mm, the leak points inside the pipes are difficult to repair because they are small in diameter and cannot be reached manually without special equipment. Summary of the Invention

[0003] The purpose of the present invention is to provide a system and method for deep cleaning the inner coating surface of steel pipes with fused epoxy powder, which mainly solves the problems existing in the above-mentioned prior art. It realizes deep cleaning of the coating surface after internal spraying and rust removal before fused epoxy powder coating of small and medium diameter steel pipes, meeting the actual needs of coating companies.

[0004] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is to provide a deep cleaning system for the surface of steel pipe fused epoxy powder internal coating, which is used to clean the inside of the steel pipe after spray derusting so as to perform the fused epoxy powder internal coating operation with high quality. It is characterized by comprising a control unit, a supporting vibration unit, a demagnetization unit and a scanning suction unit; On the one hand, the supporting vibration unit is used to fix the steel pipe, and on the other hand, under the scheduling of the control unit, continuously vibrates the steel pipe during the cleaning process, so that the iron filings in the steel pipe move to the bottom of the steel pipe under the action of gravity; the demagnetization unit demagnetizes the steel pipe under the control of the control unit, thereby eliminating the attraction between the iron filings and the steel pipe and accelerating the movement speed of the iron filings to the bottom of the steel pipe; the scanning and suction unit moves along the inside of the steel pipe under the control of the control unit, and scans the bottom of the steel pipe while moving, sucking the iron filings at the bottom of the steel pipe to complete the cleaning of the steel pipe.

[0005] Furthermore, the supporting vibration unit includes a workbench module, a vibration module and a fastening module; the workbench module is used to support the steel pipe; the fastening module is installed on the workbench module to fix the steel pipe to the workbench module; the vibration module is also installed on the workbench module to drive the workbench module to vibrate during cleaning work, thereby driving the steel pipe to vibrate synchronously.

[0006] Furthermore, the workbench module includes a table top and a buffer column; the table top is arranged horizontally and supported by the buffer column; the vibration module and the fastening module are arranged on the table top; the lower end of the buffer column is fixed to the ground, and the upper end is fixed to the table top through a buffer, isolating the table top from the ground and reducing the impact of the up and down vibration of the table top on the ground.

[0007] Furthermore, the vibration module includes a motor controller and a vibration motor; the motor controller is connected to the control unit, converts the instructions of the control unit into operating parameters of the vibration motor, and controls the operation of the vibration motor; the vibration motors are an even number and are symmetrically installed on the workbench module; the even number of vibration motors are divided into two groups, and under the control of the control unit, the two groups of vibration motors rotate in opposite directions at the same speed, so that the horizontal vibration offsets the superposition of the vertical vibration.

[0008] Furthermore, the fastening module includes a pipe seat and a fastener; there are multiple pipe seats, which are symmetrically arranged on the workbench module; the upper surface of the pipe seat is a circular arc surface, which matches the diameter of the steel pipe and is used to limit the self-rolling of the steel pipe; the fastener is arranged on both sides of the pipe seat, so that the steel pipe and the workbench module are connected as one.

[0009] Furthermore, the scanning and suction unit includes a vacuum suction module, a walking module and a scanning module; the vacuum suction module is connected to the scanning module to establish negative pressure for the scanning module; the scanning module is installed on the walking module to use negative pressure to suck the iron filings at the bottom of the steel pipe; the walking module matches the inner diameter of the steel pipe to drive the scanning module to move inside the steel pipe.

[0010] Furthermore, the vacuum suction module includes a vacuum generator, an exhaust hose and a hose reel; the vacuum generator is used to form negative pressure and is connected to the scanning module through the exhaust hose; the exhaust hose is wound around the hose reel; when the scanning module is at different positions in the steel pipe, the exhaust hose adapts to the distance between the scanning module and the vacuum generator, and is released or retracted from the hose reel.

[0011] Furthermore, the walking module includes a walking motor, walking wheels, supporting wheels and a walking trolley; the walking wheels are located at the bottom of the trolley, contacting the lower part of the steel pipe, and supporting the walking module and the scanning module from bottom to top; the supporting wheels are located on the side and top of the walking trolley, contacting the side walls and top of the steel pipe; the walking wheels and the supporting wheels cooperate to ensure that the walking trolley moves stably along the axial direction of the steel pipe; the walking motor is driven and connected to the walking wheels to provide power for the walking trolley.

[0012] Furthermore, the scanning module includes a swing motor, a swing drum and a scanning dust collection tube; the swing motor is installed on the walking module to drive the swing drum to swing; the scanning dust collection tube is fixed on the swing drum and is driven by the swing drum to swing, thereby scanning the bottom of the steel pipe back and forth; the scanning dust collection tube is connected to the vacuum suction module, obtains negative pressure from the vacuum suction module, and absorbs the iron filings at the bottom of the steel pipe during the swinging process.

[0013] The present invention also discloses a cleaning method using the above-mentioned steel pipe sintered epoxy powder internal coating surface deep cleaning system, which is characterized by comprising the steps of: Step S100, using the fastening module in the supporting vibration unit to fix the steel pipe on the workbench module in the supporting vibration unit; Step S200, configuring the operating parameters of the control unit, including the length of the steel pipe, demagnetization time, vacuum suction pressure, travel speed, and scanning speed; Step S300, using the control unit to start the demagnetization unit to demagnetize the steel pipe; after the demagnetization time has elapsed, the demagnetization unit is turned off; Step S400, using the control unit to start the walking module in the scanning and suction unit, driving the scanning module in the scanning and suction unit to enter one end of the steel pipe; Step S500: using the control unit to turn on the vibration module of the supporting vibration unit, vibrating the demagnetized steel pipe so that the iron filings fall below the center line of the inner wall of the steel pipe under the action of gravity; Step S600: using the control unit to start the vacuum suction module in the scanning suction unit, and then operating the walking module to drive the scanning module to move from one end to the other end in the steel pipe; Step S700: The vacuum suction module cooperates with the scanning module to clean the portion below the horizontal center line of the inner wall of the steel pipe and suck the fallen iron chips during the process of moving. Step S800: When the walking module reaches the other end of the steel pipe, the control unit turns off the vibration module, the walking module, the vacuum suction module, and the scanning module; In step S900 , the control unit controls the walking module to move in the reverse direction, drives the scanning module to retreat in the steel pipe, and finally exits from the entrance of the steel pipe to complete the cleaning.

[0014] In view of the above technical features, the deep cleaning system for the inner surface of steel pipe fusion-bonded epoxy powder coating of the present invention has the following advantages compared with the existing technology: 1. The deep cleaning system for the inner coating surface of steel pipes with fused epoxy powder of the present invention has a compact structure and can enter steel pipes that cannot be entered manually to complete automatic cleaning with high work efficiency.

[0015] 2. The present invention uses a cleaning method for a deep cleaning system for the inner coating surface of a steel pipe using sintered epoxy powder, which combines demagnetization, vibration and vacuum suction. Under the premise of reducing the magnetic force between iron filings and the steel pipe, up and down vibration is used to allow particles and dust on the upper part of the pipe to fall to the lower part. The particles and dust remaining on the lower part of the pipe are separated from the pipe wall due to the repeated instantaneous weight gain and weight loss, and are therefore more easily sucked away by the vacuum suction unit, resulting in excellent cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a system block diagram of a preferred embodiment of the steel pipe fusion epoxy powder coating surface deep cleaning system of the present invention; Figure 2 This is a schematic structural diagram of a preferred embodiment of the steel pipe fusion-bonded epoxy powder internal coating surface deep cleaning system of the present invention; Figure 3 It is a side view schematic diagram of the supporting vibration unit in a preferred embodiment of the deep cleaning system for the inner surface of steel pipe fusion-bonded epoxy powder coating of the present invention; Figure 4 yes Figure 3 Schematic top view of Figure 5 It is a side view schematic diagram of a scanning and suction unit in a preferred embodiment of the deep cleaning system for the inner surface of a steel pipe fused epoxy powder coating according to the present invention; Figure 6 This is a schematic diagram of the end face structure of a scanning and suction unit in a preferred embodiment of the deep cleaning system for the inner coating surface of a steel pipe fused epoxy powder according to the present invention; Figure 7 The present invention is a method flow chart of a preferred embodiment of a cleaning method using a deep cleaning system for inner coating surfaces of steel pipes using fused epoxy powder.

[0017] In the figure: 100-control unit, 200-support vibration unit, 300-demagnetization unit, 400-scanning suction unit, 500-steel pipe; 210-working platform module, 211-table top, 212-buffer column; 220-vibration module, 221-motor controller, 222-vibration motor; 230-fastening module, 231-tube holder, 232-fastener; 410 - vacuum suction module, 411 - vacuum generator, 412 - vacuum hose, 413 - hose reel; 420-travel module, 421-travel motor, 422-travel wheel, 423-support wheel, 424-travel trolley; 430 - scanning module, 431 - swing motor, 432 - swing drum, 433 - scanning dust suction pipe, 434 - air pipe moving slot. DETAILED DESCRIPTION

[0018] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0019] See also Figures 1 to 6 The present invention discloses a deep cleaning system for the inner surface of a steel pipe coated with fusion-bonded epoxy powder coating. As shown in the figure, a preferred embodiment thereof includes a control unit 100, a supporting vibration unit 200, a demagnetization unit 300, and a scanning suction unit 400.

[0020] The steel pipe 500 to be cleaned is a DN500 steel pipe with an outer diameter of Φ508mm, a wall thickness of 8mm, and a length of 12000mm. After the steel pipe 500 to be cleaned is cleaned and sprayed for rust removal, some iron filings will remain inside it. In order to ensure the reliability of the subsequent sintered epoxy powder coating operation, it is necessary to use this cleaning system to clean its inner surface. The control unit 100 is the control core of this system and is a programmable logic controller, specifically the Huichuan H3U programmable logic controller. It is connected to the supporting vibration unit 200, the demagnetization unit 300, and the scanning suction unit 400. It controls the demagnetization unit 300 to demagnetize the steel pipe 500, reduce the adsorption force between the iron filings and the steel pipe 500, and accelerate the movement speed of the iron filings to the bottom of the steel pipe. The demagnetization unit 300 is an MTS-500 high-intensity pulse frequency conversion demagnetizer with a demagnetization effect of less than 5GS. At the same time, the control unit 100 also dispatches the supporting vibration unit 200 and the scanning and suction unit 400 to cooperate, controlling the supporting vibration unit 200 to vibrate the steel pipe 500 in the vertical direction to accelerate the falling of iron chips, while driving the scanning and suction unit 400 to move axially inside the steel pipe 500, scanning the bottom of the steel pipe 500 while moving, sucking and cleaning the fallen iron chips, and completing the cleaning of the steel pipe 500.

[0021] The supporting vibration unit 200 is composed of a workbench module 210, a vibration module 220 and a fastening module 230. On the one hand, it fixes the steel pipe 500, and on the other hand, it continuously vibrates the steel pipe 500 during the cleaning process, so that the iron filings move to the bottom of the steel pipe 500 under the action of gravity.

[0022] The workbench module 210 is used to support the steel pipe 500 to be cleaned and includes a tabletop 211 and buffer columns 212. The tabletop 211 is arranged horizontally, with multiple buffer columns 212 positioned below it for support. The buffer columns 212 are fixed to the ground at their lower ends, and secured to the bottom of the tabletop 211 via buffers 213 at their upper ends, thereby isolating the tabletop 211 from the ground. This way, when the tabletop 211 is vibrated by the vibration module 220 during cleaning, the up and down vibrations of the tabletop 211 are absorbed by the buffers 213, significantly reducing the impact of the up and down vibrations of the tabletop 211 on the ground. Both the vibration module 220 and the fastening module 230 are mounted on the tabletop 211. The fastening module 230 includes a pipe holder 231 and a fastener 232, which are used to secure the steel pipe 500 to the tabletop 211. In this embodiment, two steel pipes 500 can be secured to the tabletop 211 at a time, thereby improving cleaning efficiency. The number of tube seats 231 corresponds to the number of steel pipes 500 fixed at one time, and can be multiple. In this embodiment, there are two, which are arranged symmetrically along the horizontal center line of the table 211. The upper surface of the tube seat 231 is a circular arc surface, which matches the diameter of the steel pipe 500. It holds the steel pipe 500 from below to limit the rolling of the steel pipe 500. There are also multiple fasteners 232, which are arranged on both sides of the tube seat 231. They radially abut the steel pipe 500 on both sides to connect the steel pipe 500 to the workbench module 210 as a whole. The tube seat 231 and the fastener 232 are used to ensure that during the vibration cleaning process, the steel pipe 500 will neither rotate around its own axis nor shift horizontally, thereby ensuring that the relative position of the scanning and suction unit 400 in the steel pipe 500 is stable during the cleaning operation.

[0023] The vibration module 220 includes a motor controller 221 and a vibration motor 222, which are used to drive the workbench module 210 to vibrate during cleaning operations, thereby causing the steel pipe 500 mounted thereon to vibrate synchronously. The motor controller 221 is connected to the control unit 100 and is controlled by the control unit 100. In this embodiment, the vibration motors 222 are two identical YZO-10-4 three-phase asynchronous motors, grade 4, with a rated power of 1.0 kW, an excitation force of 10 kN, and an amplitude of 2-4 mm. The motor controller 221 uses a Huama JB synchronous controller. The motor controller 221 is not mounted on the table 211, thereby reducing the impact of vibration on the motor controller 221. The motor controller 221 converts instructions from the control unit 100 into operating parameters for the vibration motor 222, thereby controlling the vibration motor 222's speed, operating time, and other behaviors. There is an even number of vibration motors 222, which are divided into two groups and symmetrically mounted on the workbench module 210. During the cleaning process, the vertical vibration of the steel pipe 500 is conducive to the falling of iron chips, but the horizontal vibration is not conducive to the suction of iron chips. The control unit 100 drives the two sets of vibration motors 222 to rotate in opposite directions at the same speed. Because the vibration motors 222 are installed symmetrically, the horizontal vibrations will cancel each other out, while the vertical vibrations will be superimposed. In this embodiment, two vibration motors 222 are provided, which are fixed at both ends of the table 211 and are located on the longitudinal centerline of the table 211 and symmetrically about the transverse centerline of the table 211.

[0024] The scanning and suction unit 400 includes a vacuum suction module 410, a walking module 420, and a scanning module 430. The vacuum suction module 410 consists of a vacuum generator 411, an exhaust hose 412, and a hose reel 413. The vacuum generator 411 uses a Karcher IVC60 / 24-2 AP industrial vacuum cleaner with a vacuum degree of 25.4 kPa, a rated power of 2.4 kW, and is equipped with a centrifugal separation, filtration, and cleaning system. The exhaust hose 412 is a DN40 carbon fiber tube with a diameter of DN40 mm. It is used to provide vacuum conditions and form negative pressure, and then is connected to the scanning module 430 through the exhaust hose 412 to provide negative pressure for suction. The hose reel 413 is used to store the exhaust hose 412 in a wound manner. During cleaning, the scanning module 430 moves within the steel pipe 500 along with the traveling module 420. Suction operation requires that the scanning module 430 receive negative pressure from the vacuum generator 411 regardless of its position within the steel pipe 500. Therefore, the hose reel 413 is used to adjust the distance between the scanning module 430 and the vacuum generator 411. When the distance is short, the suction hose 412 is retracted and wound around the hose reel 413. When the distance increases, the suction hose 412 is released from the hose reel 413. The hose reel 413 has a diameter of 600 mm.

[0025] The walking module 420 is composed of a walking motor 421, walking wheels 422, support wheels 423 and a walking trolley 424, which matches the inner diameter of the steel pipe 500 and drives the scanning module 430 to move inside the steel pipe. The walking motor 421 is a servo motor, model is Huichuan MS1H155B30CB, the motor rated power is 0.55kw, and the power supply mode is 220V AC. It is connected to the control unit 100 via a cable and is installed and fixed in the traveling trolley 424. The walking wheels 422 and the support wheels 423 cooperate with each other to ensure that the scanning module 430 is in a stable position when it moves along the axial direction of the steel pipe, thereby ensuring the suction efficiency. Specifically, there are multiple walking wheels 422, which are located at the bottom of the walking trolley 424. It contacts the lower part of the steel pipe and is responsible for supporting the walking module 420 and the scanning module 430 from the bottom to the top, and undertakes most of the support role. The travel wheels 422 are also connected to the travel motor 421. Under the control of the control module 100, they are driven by the travel motor 412 to rotate, driving the travel module 420 and the scanning module 430 to move back and forth within the steel pipe 500. In this embodiment, the travel motor 421 is only connected to the rear travel wheels 422. There are also multiple support wheels 423 (for example, 1 to 5). These are located on the sides and top of the travel carriage 424, abutting against the side walls and top of the steel pipe 500, and are used to limit the left and right swaying and upward jumping of the travel carriage 424 and the scanning module 430 mounted thereon within the steel pipe 500.

[0026] The scanning module 430 includes a swing motor 431, a swing drum 432, and a scanning dust collection tube 433. It is mounted on the travel module 420 and uses negative pressure to extract iron filings from the lower portion of the steel pipe 500. The swing motor 431 is a servo motor, model Novolux MS1H155B30CB, with a rated power of 0.55 kW and a 220V AC power supply. It is mounted on the travel trolley 424 and connected to the control unit 100 via a cable. The swing drum 432 is made of a thin-walled steel pipe with a length of 400 mm, an outer diameter of 100 mm, and a wall thickness of 3 mm. The swing drum 432 is perpendicular to the front end of the travel trolley 424 and penetrates the front end of the travel trolley 424, where it is fixedly connected to the swing motor 431 within the travel trolley 424. The swing drum 432 is connected to the front end of the travel trolley 424 via a bearing. The swing drum 432 swings under the drive of the swing motor 431. The scanning dust suction tube 433 is a 90-degree bend pipe, which is welded and fixed below the exposed part of the oscillating drum 432. The nozzle is vertically pointed to the lower wall of the steel pipe 500 and swings with the oscillating drum 432. The scanning dust suction tube 433 is made of steel pipe + PVC pipe, that is, the bend pipe is made of steel pipe, and the lower pipe head is made of PVC pipe. The nozzle is arc-shaped, and the distance between the nozzle and the pipe wall is 0.5-1.0mm. The swing angle of the scanning dust suction tube 433 is no more than 90 degrees on the left and right with the vertical line as the center line, so that the part below the center line of the steel pipe 500 can be scanned back and forth. The exhaust hose 412 of the trolley is introduced from the hose reel 413, passes through the air pipe movable slot 414 on the front end face of the trolley 424, and is sealed and connected to one end of the scanning dust suction tube 433, so that the scanning dust suction tube 433 obtains negative pressure from the vacuum generator 411. The air pipe slot 414 is arc-shaped, with its center located on the axis of the oscillating drum 432. The slot's width is greater than the diameter of the air extraction hose 412. The specific parameters of the air pipe slot 414 are a width of 60 mm and an arc of 200 degrees. The other end of the sweeping vacuum tube 433 is positioned close to the inner surface of the steel pipe 500, sucking up iron filings that fall to the bottom of the steel pipe 500 as it oscillates.

[0027] See also Figure 7 The present invention also discloses a cleaning method using the above steel pipe fused epoxy powder inner coating surface deep cleaning system, which is characterized by comprising the steps of: Step S1, fixing the steel pipe.

[0028] The steel pipe is secured to the workbench module using the fastening module in the support vibration unit. Specifically, a pipe holder is selected that matches the pipe, ensuring that the pipe's outer diameter aligns with the pipe holder's groove arc. The pipe is placed on the holder, and then multiple sets of fasteners are installed on both sides to clamp the pipe securely to the workbench.

[0029] Step S2: Configure working parameters.

[0030] The entire cleaning process is scheduled by the control unit. Therefore, before the cleaning work begins, the configuration of the control unit must be completed and its working parameters must be set, including the length of the steel pipe, vibration parameters (amplitude 3mm, vibration frequency 50Hz), demagnetization time, vacuum suction pressure (air flow 148l / s, output vacuum degree 25.4kPa), walking speed (1200mm / min), rotation frequency (30 cycles per minute) and rotation amplitude angle (left and right rotation amplitude is 90 degrees), etc.

[0031] Step S3, demagnetizing the steel pipe.

[0032] When the cleaning process begins, the control unit first activates the demagnetization unit to demagnetize the steel pipe. After a set demagnetization time based on operating parameters, the control unit instructs the demagnetization unit to shut down. Demagnetization reduces the magnetic force between the steel pipe and the iron filings trapped inside, reducing their overall adhesion and allowing them to more easily break away from the pipe's sidewalls and collect at the bottom.

[0033] Step S4, the scanning suction unit enters the steel pipe.

[0034] The control unit activates the travel module within the scanning and suction unit, driving it into one end of the steel pipe. After demagnetization, most of the iron filings have fallen to the bottom of the pipe due to gravity. The scanning module in the scanning and suction unit then prepares to perform a complete scan of the pipe, removing all the iron filings. The support wheels in the travel module maintain a constant pressure against the pipe wall, ensuring the travel trolley remains level and stable within the pipe.

[0035] Step S5, vibrating the steel pipe.

[0036] The control unit turns on the vibration module supporting the vibration unit and sends a control instruction to the motor controller. The motor controller drives the vibration motor to rotate based on the vibration parameters in the working parameters. The vibration motors in different groups in the vibration module operate at the same speed in opposite directions. Because the vibration motors in different groups are symmetrically distributed on the table, when the vibration motors are running, the horizontal vibrations are offset by each other while the vertical vibrations are strengthened. In this way, the steel pipe fixed on the table begins to vibrate up and down, causing the iron filings attached to the steel pipe to break away from the inner wall of the steel pipe under the action of vibration force and weightlessness, and fall to the part below the center line of the inner wall of the steel pipe. After the vibration stabilizes, step S6 is entered.

[0037] Step S6: start vacuum suction.

[0038] The control unit activates the vacuum module in the scanning and suction unit. Based on the vacuum pressure specified in the operating parameters, the vacuum generator activates, creating negative pressure. This negative pressure is transmitted through the vacuum hose to the scanning module's vacuum hose, which begins to suction the scrap metal between the hose and the inner wall of the steel pipe. Simultaneously, the oscillating motor activates, driving the oscillating drum to swing the vacuum hose across the lower half of the steel pipe at the frequency and amplitude specified in the operating parameters.

[0039] The control unit sends control instructions to the walking motor in the walking module, and the walking motor starts to drive the walking wheels to roll, driving the walking module and the scanning module to enter the steel pipe together at the walking speed configured by the working parameters, and move from one end to the other.

[0040] Step S7, cleaning the inside of the steel pipe.

[0041] During the process, the vacuum suction module and the scanning module cooperate to sweep and suction at the swing frequency and swing amplitude angle specified in the working parameters. This sweeps the area below the horizontal centerline of the steel pipe wall and sucks up the fallen iron chips. The sucked iron chips are sent to the vacuum generating unit through the suction hose, and then enter the dust collection container after centrifugal separation.

[0042] Step S8, reaching the end point of the steel pipe.

[0043] Based on the pipe length set in the operating parameters, the control unit shuts down the vibration module, the travel module, the vacuum module, and the scanning module when it determines that the travel module has reached the other end of the pipe. At this point, the scanning module has completed scanning and vacuum cleaning the entire pipe interior. The vacuum generator stops operating, and the negative pressure is eliminated.

[0044] Step S9: Recover the scanning and suction unit.

[0045] The control unit sends a return command to the walking module, the walking motor rotates in the opposite direction, driving the walking wheel to reverse, thereby driving the scanning module to retreat inside the steel pipe and finally exit from the entrance of the steel pipe, completing the recovery work after cleaning.

[0046] The effectiveness of this method was evaluated as follows. After 12 minutes of operation, the trolley reached the end of a DN500 steel pipe, completing a deep clean of the pipe's interior surface. A cleanliness comparison of the deep-cleaned steel pipes using adhesive tape was performed. The results showed that the deep-cleaned steel pipes using this method showed a significant reduction in debris and dust on the interior surface.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A deep cleaning system for the surface of steel pipe fused epoxy powder internal coating, used to clean the inside of steel pipes after spray derusting, so as to carry out high-quality fused epoxy powder internal coating operations, characterized in that: It includes a control unit, a supporting vibration unit, a demagnetizing unit and a scanning suction unit; On the one hand, the supporting vibration unit is used to fix the steel pipe, and on the other hand, under the scheduling of the control unit, continuously vibrates the steel pipe during the cleaning process, so that the iron filings in the steel pipe move to the bottom of the steel pipe under the action of gravity; the demagnetization unit demagnetizes the steel pipe under the control of the control unit, thereby eliminating the attraction between the iron filings and the steel pipe and accelerating the movement speed of the iron filings to the bottom of the steel pipe; the scanning and suction unit moves along the inside of the steel pipe under the control of the control unit, and scans the bottom of the steel pipe while moving, sucking the iron filings at the bottom of the steel pipe to complete the cleaning of the steel pipe.

2. The deep cleaning system for the inner surface of steel pipe fusion-bonded epoxy powder coating according to claim 1 is characterized in that: The supporting vibration unit includes a workbench module, a vibration module and a fastening module; the workbench module is used to support the steel pipe; the fastening module is installed on the workbench module to fix the steel pipe to the workbench module; the vibration module is also installed on the workbench module to drive the workbench module to vibrate during cleaning work, thereby driving the steel pipe to vibrate synchronously.

3. The deep cleaning system for the inner surface of steel pipe fusion-bonded epoxy powder coating according to claim 2 is characterized in that: The workbench module includes a table top and a buffer column; the table top is arranged horizontally and supported by the buffer column; the vibration module and the fastening module are arranged on the table top; the lower end of the buffer column is fixed to the ground, and the upper end is fixed to the table top through a buffer, isolating the table top from the ground and reducing the impact of the up and down vibration of the table top on the ground.

4. The deep cleaning system for the inner surface of steel pipe fusion-bonded epoxy powder coating according to claim 2 is characterized in that: The vibration module includes a motor controller and a vibration motor; the motor controller is connected to the control unit, converts the instructions of the control unit into operating parameters of the vibration motor, and controls the operation of the vibration motor; the vibration motors are an even number and are symmetrically installed on the workbench module; the even number of vibration motors are divided into two groups, and under the control of the control unit, the two groups of vibration motors rotate in opposite directions at the same speed, so that the horizontal vibration offsets the superposition of the vertical vibration.

5. The deep cleaning system for the inner surface of steel pipe fusion-bonded epoxy powder coating according to claim 2 is characterized in that: The fastening module includes a pipe seat and a fastener; there are multiple pipe seats, which are symmetrically arranged on the workbench module; the upper surface of the pipe seat is an arc surface, which matches the diameter of the steel pipe and is used to limit the self-rolling of the steel pipe; the fastener is arranged on both sides of the pipe seat, radially pressing against the steel pipe, so that the steel pipe and the workbench module are connected as one.

6. The deep cleaning system for the inner surface of steel pipe fusion-bonded epoxy powder coating according to claim 1 is characterized in that: The scanning and suction unit includes a vacuum suction module, a walking module and a scanning module; the vacuum suction module is connected to the scanning module to establish negative pressure for the scanning module; the scanning module is installed on the walking module and uses negative pressure to suck the iron filings at the bottom of the steel pipe; the walking module matches the inner diameter of the steel pipe and drives the scanning module to move inside the steel pipe.

7. The deep cleaning system for the inner surface of steel pipe fusion-bonded epoxy powder coating according to claim 6 is characterized in that: The vacuum suction module includes a vacuum generator, an exhaust hose and a hose reel; the vacuum generator is used to form negative pressure and is connected to the scanning module through the exhaust hose; the exhaust hose is wound around the hose reel; when the scanning module is at different positions in the steel pipe, the exhaust hose adapts to the distance between the scanning module and the vacuum generator, and is released or retracted from the hose reel.

8. The deep cleaning system for the inner surface of steel pipe fusion-bonded epoxy powder coating according to claim 6 is characterized in that: The walking module includes a walking motor, walking wheels, supporting wheels and a walking trolley; the walking wheels are located at the bottom of the trolley, contacting the lower part of the steel pipe, and supporting the walking module and the scanning module from bottom to top; the supporting wheels are located on the side and top of the walking trolley, contacting the side walls and top of the steel pipe; the walking wheels and the supporting wheels cooperate to ensure that the walking trolley moves stably along the axial direction of the steel pipe; the walking motor is driven and connected to the walking wheels to provide power for the walking trolley.

9. The deep cleaning system for the inner surface of steel pipe fusion-bonded epoxy powder coating according to claim 6, characterized in that: The scanning module includes a swing motor, a swing drum and a scanning dust collection tube; the swing motor is installed on the walking module to drive the swing drum to swing; the scanning dust collection tube is fixed on the swing drum and is driven by the swing drum to swing, thereby scanning the bottom of the steel pipe back and forth; the scanning dust collection tube is connected to the vacuum suction module, obtains negative pressure from the vacuum suction module, and absorbs the iron filings at the bottom of the steel pipe during the swinging process.

10. A cleaning method using the deep cleaning system for inner coating surface of steel pipe fusion bonded epoxy powder coating according to claim 1, characterized in that: Contains steps: Step S100, using the fastening module in the supporting vibration unit to fix the steel pipe on the workbench module in the supporting vibration unit; Step S200, configuring the operating parameters of the control unit, including the length of the steel pipe, demagnetization time, vacuum suction pressure, travel speed, and scanning speed; Step S300, using the control unit to start the demagnetization unit to demagnetize the steel pipe; after the demagnetization time has elapsed, the demagnetization unit is turned off; Step S400, using the control unit to start the walking module in the scanning and suction unit, driving the scanning module in the scanning and suction unit to enter one end of the steel pipe; Step S500: using the control unit to turn on the vibration module of the supporting vibration unit, vibrating the demagnetized steel pipe so that the iron filings fall below the center line of the inner wall of the steel pipe under the action of gravity; Step S600: using the control unit to start the vacuum suction module in the scanning suction unit, and then operating the walking module to drive the scanning module to move from one end to the other end in the steel pipe; Step S700: The vacuum suction module cooperates with the scanning module to clean the portion below the horizontal center line of the inner wall of the steel pipe and suck the fallen iron chips during the process of moving. Step S800: When the walking module reaches the other end of the steel pipe, the control unit turns off the vibration module, the walking module, the vacuum suction module, and the scanning module; In step S900 , the control unit controls the walking module to move in the reverse direction, drives the scanning module to retreat in the steel pipe, and finally exits from the entrance of the steel pipe to complete the cleaning.

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