Cleaning device and method for tubular fixed bed reactor

Abstract

The invention relates to the technical field of cleaning of reaction tubes, and particularly discloses a cleaning device and method for a tubular fixed bed reactor, and the device comprises a grinding wheel which is in a circular ring shape, the outer surface of the grinding wheel is matched with the inner wall of a tube nest, and the grinding wheel is used for cleaning rusty spots on the inner wall of the tube nest; the plurality of guide wheels are used for providing guide thrust for the cleaning device to move along the tube nest; the motor is rotationally connected with the grinding wheel and the guide wheels; and the battery is electrically connected with the motor and is used for providing electric energy for the motor. According to the cleaning device for the tubular fixed bed reactor, the grinding wheel and the guide wheels are driven by the motor to work, the cleaning precision and reliability of the inner wall of a tube nest are improved, the labor intensity of field manual cleaning is reduced, contact between field workers and dust is reduced, and the health problem caused by the dust is solved.

Description

Technical Field

[0001] The invention relates to the cleaning technology field of reaction tubes, and in particular to a cleaning device and method for a tube-in-tube fixed bed reactor. Background Art

[0002] The quality of the catalyst used in the epoxidation of ethylene to produce ethylene oxide directly affects the quality and output of the product, and even safe production. When the catalyst is replaced, the inner wall of the reaction tube will have rust spots (carbon steel reaction tube), reaction by-products and impurities carried by the airflow due to long-term use, and it needs to be cleaned. If the reaction tube is not cleaned properly, the dust attached to and falling off the tube wall will affect the operation of the catalyst, resulting in significant differences in the heat release and heat transfer rate of each reaction tube, which in turn causes changes in the reaction temperature of each tube, and in severe cases causes local overheating and catalyst deactivation. In addition, dust during the cleaning of the reaction tube is also an important factor causing pollution and harming the health of operators.

[0003] Shell-and-tube reactors are widely used in ethylene epoxidation. The number of shell-and-tube reactors in my country has exceeded 30,000, and reactors with 10,000 to 20,000 are more common. Cleaning the reaction tubes of shell-and-tube reactors has become a more prominent problem. At present, most of the cleaning methods are manual cleaning, usually by manual spiral sandblasting. The specific method is to use an automatic sandblasting machine for sandblasting. The sand is required to be dry refined quartz sand with a specification of 20 to 40 mesh and a hardness of 6 to 7. The sand that has been blasted cannot be reused. Sandblasting test: 10 reaction tubes are randomly selected for test blasting. The sandblasting test time is determined by the patent owner, the owner and the construction party. All reaction tubes are sandblasted one by one. After each blasting, a cap of a specified color is placed on the upper tube mouth of the reaction tube. After the sandblasting of the reaction tube is completed, an endoscope is used to check and confirm.

[0004] During the cleaning operation, the reactor is a closed space, and the reaction tubes are filled with dust and sand. The operating environment is very harsh, which is not suitable for workers to work in the reactor for a long time and complete the cleaning work with high quality. In addition, manual operation cannot control the cleaning accuracy well, which will affect the production efficiency. Moreover, about 1%-3% of the tubes cannot be cleaned to meet the requirements and need to be reworked. Therefore, the current cleaning devices and methods have a certain degree of impact on the health of workers, the production time and benefits of enterprises.

[0005] Based on this background, the present invention develops a cleaning device and method for a tubular fixed bed reactor. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a cleaning device and method for a tubular fixed bed reactor. The device is provided with a circulation system, which can ensure that various parameters of the test solution remain stable, and at the same time has obvious improvements in operability, safety and environmental protection, and solves the problem that the conventional laboratory solution immersion method cannot control the volatilization of the chlorine dioxide solution and the concentration is unstable.

[0007] In order to achieve the above object, the present invention provides a cleaning device for a tubular fixed bed reactor in a first aspect, comprising:

[0008] A grinding wheel is in the shape of a ring, the outer surface of which is adapted to the inner wall of the tube, and is used to clean the rust spots on the inner wall of the tube;

[0009] A plurality of guide wheels, used for providing guiding thrust for the cleaning device to move along the tube array;

[0010] A motor is rotatably connected to the grinding wheel and the plurality of guide wheels respectively;

[0011] A battery is electrically connected to the motor and is used to provide electrical energy to the motor.

[0012] A second aspect of the present invention provides a method for using the cleaning device, comprising:

[0013] After the cleaning device is powered on, it is placed from above the tube array with the grinding wheel at the bottom and the guide wheel at the top;

[0014] The motor drives the guide wheel, and the guide wheel pushes the cleaning device downward. Meanwhile, during the downward process, the motor drives the grinding wheel to clean the pipe wall.

[0015] After the cleaning device drills out from under the tube array, it falls into the collector for collection.

[0016] The beneficial effects of the present invention include:

[0017] (1) The cleaning device for a tube-in-tube fixed-bed reactor proposed in the present invention drives a grinding wheel and a plurality of guide wheels to work by an electric motor, thereby improving the cleaning accuracy and reliability of the inner wall of the tube-in-tube, reducing the labor intensity of on-site manual cleaning, reducing the contact of on-site workers with dust, and reducing the health problems caused by dust.

[0018] (2) The cleaning device for a tube-in-tube fixed-bed reactor proposed in the present invention can adjust the diameter of the grinding wheel by adjusting the length of a plurality of adjustable support rods. At the same time, the diameter of the circle formed by the rims of a plurality of guide wheels can be adjusted by cooperating with a plurality of retractable support structures in conjunction with a second transmission device, thereby ensuring that the cleaning device can adapt to different tube diameters.

[0019] (3) The cleaning device for a tube-in-tube fixed bed reactor proposed in the present invention has a transmission device and a plurality of retractable support structures, which can ensure that the motor provides sufficient guide thrust for the plurality of guide wheels, thereby ensuring the reliability of the operation of the cleaning device and the cleaning effect of the inner wall of the tube-in-tube.

[0020] (4) The cleaning device for a tubular fixed bed reactor proposed in the present invention has a WIFI module and / or Bluetooth module, a power detection module and a timer arranged in the controller, which can not only control the start, shutdown, speed adjustment or reversal of the motor through external control instructions, but also send power and working time signals to the remote control terminal, which not only has a high degree of automation, but also ensures the cleaning quality of the reaction tube.

[0021] (5) The method for using the cleaning device for a tubular fixed bed reactor proposed in the present invention can monitor the battery power and working time in real time through a remote terminal during the downward movement of the cleaning device. When the battery power decreases rapidly, the motor speed can be adjusted through the remote terminal, or the motor can be controlled in reverse to make the cleaning device return to its original path and then replace the battery and / or grinding wheel, which is flexible and convenient.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0024] Figure 1 The figure is a schematic structural diagram of a cleaning device for a tubular fixed bed reactor proposed by the present invention.

[0025] Figure 2 The diagram is a top view of a grinding wheel in a cleaning device for a tubular fixed bed reactor proposed in the present invention.

[0026] Description of reference numerals:

[0027] 1- grinding wheel, 2- motor, 3- guide wheel, 4- battery;

[0028] 101-grinding block, 102-length-adjustable support rod, 103-clamping piece. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0030] In the present invention, unless otherwise specified, the directional words used, such as "upper and lower", generally refer to the upper and lower parts of the device in normal use, and "inside and outside" refer to the outline of the device. In addition, the terms "first, second, third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first, second, third" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0031] The present invention provides a cleaning device for a tubular fixed bed reactor, such as Figure 1 As shown, including:

[0032] The grinding wheel 1 is in the shape of a torus, and its outer surface is adapted to the inner wall of the tube, and is used to clean the rust spots on the inner wall of the tube;

[0033] A plurality of guide wheels 3 are used to provide guiding thrust for the cleaning device to move along the tube array;

[0034] The motor 2 is rotatably connected to the grinding wheel 1 and the plurality of guide wheels 3;

[0035] The battery is electrically connected to the motor 2 and is used to provide electrical energy to the motor 2 .

[0036] In the present invention, the grinding wheel 1 and the plurality of guide wheels 3 are driven by the motor 2 to work, thereby improving the cleaning accuracy and reliability of the inner wall of the tube array, reducing the labor intensity of on-site manual cleaning, reducing the contact between on-site workers and dust, and reducing the health problems caused by dust.

[0037] According to the present invention, it also includes:

[0038] The auxiliary support structure is cylindrical, with a grinding wheel 1 and a battery clamping structure provided at the head and tail, respectively, and a motor 2 and a plurality of guide wheels 3 provided in the middle;

[0039] The grinding wheel 1 and the battery clamping structure are used for disassembling, clamping or replacing the grinding wheel 1 and the battery respectively;

[0040] The grinding wheel includes a plurality of grinding blocks 101, a plurality of length-adjustable support rods 102 and a clamping member 103. Each grinding block 101 is in the shape of a fan ring, and the clamping member 103 is in the shape of a circular ring. The plurality of grinding blocks 101 are arranged in the shape of a circular ring, and the axis of the circular ring coincides with the axis of the clamping member 103, the radial plane where the high midpoint is located coincides with the radial plane where the high midpoint of the clamping member 103 is located, and the inner ring surface diameter is greater than the outer ring surface diameter of the clamping member 103.

[0041] The inner annular surface of each grinding block 101 is connected to the outer annular surface of the clamping member 103 via a length-adjustable support rod 102;

[0042] The motor 2 is provided with a switch, a speed adjustment button, and a reverse button. The switch is used to control the start and stop of the motor 2, the speed adjustment button is used to adjust the speed of the motor 2, and the reverse button is used to control the reverse rotation of the motor 2.

[0043] According to the present invention, a plurality of guide wheels 3 are evenly distributed along the radial direction of the cleaning device, the plane where the wheel surface of each guide wheel 3 is located is located on the radial plane of the cleaning device, and the wheel rim contacts the inner wall of the tube array.

[0044] Preferably, it also includes:

[0045] A mechanical transmission device, comprising a first transmission device (not shown) and a second transmission device (not shown);

[0046] One end of the first transmission device (not shown) is rotatably connected to the rotating shaft of the motor 2, and the other end is rotatably connected to the inner surface of the clamping member 103. The first transmission device (not shown) is used to convert the power of the motor 2 into the rotational force of the grinding wheel 1;

[0047] One end of the second transmission device (not shown) is rotationally connected to the rotating shaft of the motor 2, and the other end is rotationally connected to the axle of each guide wheel 3. The second transmission device (not shown) is used to convert the power of the motor 2 into the guide thrust of multiple guide wheels 3.

[0048] According to the present invention, it also includes:

[0049] A plurality of retractable support structures (not shown), each of which is disposed on a guide wheel 3 and is used to increase the contact force between the rim of the guide wheel 3 and the inner wall of the tube array;

[0050] A plurality of retractable support structures (not shown) cooperate with a second transmission device (not shown) to adjust the diameter of the circle formed by the rims of the plurality of guide wheels 3 as the diameter of the tube array changes.

[0051] In the present invention, the transmission device and multiple retractable support structures (not shown) provided in the cleaning device can ensure that the motor 2 provides sufficient guide thrust for the multiple guide wheels 3, thereby ensuring the reliability of the operation of the cleaning device and the cleaning effect of the inner wall of the tube array.

[0052] In the present invention, the diameter of the grinding wheel can be adjusted by adjusting the length of multiple adjustable length support rods 102. At the same time, the diameter of the circle formed by the rims of multiple guide wheels 3 can be adjusted by cooperating with multiple retractable support structures (not shown) and the second transmission device (not shown), thereby proving that the cleaning device can adapt to different pipe diameters.

[0053] Preferably, it also includes:

[0054] The controller is provided with a WIFI module and / or a Bluetooth module for receiving remote control instructions and controlling the start, shut down, speed adjustment or reversal of the motor 2 through the control instructions.

[0055] According to the present invention, the controller is also provided with a power detection module and a timer;

[0056] The power detection module is used to monitor the battery power and send the power to the remote control terminal through the WIFI module or Bluetooth module;

[0057] The timer is used to record the working time of the cleaning device and send the working time to the remote control terminal through the WIFI module or the Bluetooth module;

[0058] The remote control terminal is any one of a mobile phone, a computer, a single chip microcomputer, and a DSP.

[0059] In the present invention, the WIFI module and / or Bluetooth module, power detection module and timer arranged in the controller can not only control the start, shutdown, speed adjustment or reversal of the motor 2 through external control instructions, but also send power and working time signals to the remote control terminal, which not only has a high degree of automation, but also ensures the cleaning quality of the reaction tube.

[0060] According to the present invention, the outer diameter of the cleaning device is 20-60 mm.

[0061] The present invention also provides a method for using the cleaning device, comprising:

[0062] After the cleaning device is powered on, the grinding wheel 1 is placed at the bottom and the guide wheels 3 are placed at the top from above the tube array;

[0063] The motor 2 drives a plurality of guide wheels 3, and the plurality of guide wheels 3 push the cleaning device downward. Meanwhile, during the downward process, the motor 2 drives the grinding wheel 1 to clean the pipe wall.

[0064] After the cleaning device drills out from under the tube array, it falls into the collector for collection.

[0065] According to the present invention, during the downward movement of the cleaning device, the battery power is monitored in real time through a remote terminal. If the battery power drops rapidly, the motor speed is adjusted through the remote terminal, or the motor is controlled in reverse to allow the cleaning device to return to its original path and then replace the battery and / or grinding wheel 1.

[0066] In the present invention, when the battery power is abnormal during the downward movement of the cleaning device, the motor speed can be adjusted through the remote terminal, or the motor can be controlled in reverse to make the cleaning device return to its original path and then replace the battery and / or the grinding wheel 1, which is flexible and convenient.

[0067] The present invention will be described in more detail below by way of examples.

[0068] Example 1

[0069] This embodiment provides a cleaning device for a tubular fixed bed reactor, such as Figure 1 As shown, including:

[0070] The grinding wheel 1 is in the shape of a torus, and its outer surface is adapted to the inner wall of the tube, and is used to clean the rust spots on the inner wall of the tube;

[0071] A plurality of guide wheels 3 are used to provide guiding thrust for the cleaning device to move along the tube array;

[0072] The motor 2 is rotatably connected to the grinding wheel 1 and the plurality of guide wheels 3;

[0073] a battery, electrically connected to the motor 2, and used to provide electric energy to the motor 2;

[0074] The auxiliary support structure is cylindrical, with a grinding wheel 1 and a battery clamping structure provided at the head and tail, respectively, and a motor 2 and a plurality of guide wheels 3 provided in the middle;

[0075] The grinding wheel 1 and the battery clamping structure are used for disassembling, clamping or replacing the grinding wheel 1 and the battery respectively;

[0076] The grinding wheel includes a plurality of grinding blocks 101, a plurality of length-adjustable support rods 102 and a clamping member 103. Each grinding block 101 is in the shape of a fan ring, and the clamping member 103 is in the shape of a circular ring. The plurality of grinding blocks 101 are arranged in the shape of a circular ring, and the axis of the circular ring coincides with the axis of the clamping member 103, the radial plane where the high midpoint is located coincides with the radial plane where the high midpoint of the clamping member 103 is located, and the inner ring surface diameter is greater than the outer ring surface diameter of the clamping member 103.

[0077] The inner annular surface of each grinding block 101 is connected to the outer annular surface of the clamping member 103 via a length-adjustable support rod 102;

[0078] The motor 2 is provided with a switch, a speed adjustment button, and a reverse button. The switch is used to control the start and stop of the motor 2, the speed adjustment button is used to adjust the speed of the motor 2, and the reverse button is used to control the reverse of the motor 2;

[0079] A plurality of guide wheels 3 are evenly distributed along the radial direction of the cleaning device, the plane where the wheel surface of each guide wheel 3 is located is located on the radial surface of the cleaning device, and the wheel rim is in contact with the inner wall of the tube array;

[0080] The cleaning device of this embodiment further includes:

[0081] A mechanical transmission device, comprising a first transmission device (not shown) and a second transmission device (not shown);

[0082] One end of the first transmission device (not shown) is rotatably connected to the rotating shaft of the motor 2, and the other end is rotatably connected to the inner surface of the clamping member 103. The first transmission device (not shown) is used to convert the power of the motor 2 into the rotational force of the grinding wheel 1;

[0083] One end of the second transmission device (not shown) is rotatably connected to the rotating shaft of the motor 2, and the other end is rotatably connected to the axle of each guide wheel 3. The second transmission device (not shown) is used to convert the power of the motor 2 into the guide thrust of the multiple guide wheels 3;

[0084] A plurality of retractable support structures (not shown), each of which is disposed on a guide wheel 3 and is used to increase the contact force between the rim of the guide wheel 3 and the inner wall of the tube array;

[0085] A plurality of retractable support structures (not shown) cooperate with a second transmission device (not shown) to adjust the diameter of the circle formed by the rims of the plurality of guide wheels 3 as the diameter of the tube array changes;

[0086] The controller is provided with a WIFI module and / or a Bluetooth module, and is used to receive remote control instructions, and control the start, shut down, speed adjustment or reversal of the motor 2 through the control instructions;

[0087] The controller is also provided with a power detection module and a timer;

[0088] The power detection module is used to monitor the battery power and send the power to the remote control terminal through the WIFI module or Bluetooth module;

[0089] The timer is used to record the working time of the cleaning device and send the working time to the remote control terminal through the WIFI module or the Bluetooth module;

[0090] In this embodiment, the remote control terminal is a computer;

[0091] The outer diameter of the cleaning device is 20-60 mm.

[0092] This embodiment provides a method for using the cleaning device, including:

[0093] After the cleaning device is powered on, the grinding wheel 1 is placed at the bottom and the guide wheels 3 are placed at the top from above the tube array;

[0094] The motor 2 drives a plurality of guide wheels 3, and the plurality of guide wheels 3 push the cleaning device downward. Meanwhile, during the downward process, the motor 2 drives the grinding wheel 1 to clean the pipe wall.

[0095] After the cleaning device is drilled out from under the tube array, it falls into the collector for collection;

[0096] In this embodiment, during the downward movement of the cleaning device, the battery power is monitored in real time through the remote terminal. If the battery power drops rapidly, the motor speed is adjusted through the remote terminal, or the motor is controlled in reverse to allow the cleaning device to return to its original path and then replace the battery and / or grinding wheel 1.

[0097] Example 2

[0098] A carbon steel tubular reactor containing ten reaction tubes with a diameter of 38 mm and a length of 8 meters was prepared by four skilled workers and the sandblasting cleaning time was five hours. After cleaning, one reaction tube was not cleaned properly due to rust stains. The cleaning of the reaction tube did not meet the requirements and was cleaned again and met the standards.

[0099] The cleaning device for the tubular fixed bed reactor in Example 1 was used for cleaning, wherein the battery length of the cleaning device was set to 40 cm, the outer diameter of the grinding wheel 1 was adjusted to 38 mm, and a total of ten cleaning devices were used. The cleaning devices were placed in the reaction tubes in a manner such that the grinding wheel 1 was at the bottom and the guide wheel was at the top. The downward speed of the device was 2 m / h. It took a total of 4 hours for all ten reaction tubes to meet the cleaning requirements.

[0100] Example 3

[0101] A stainless steel tubular reactor containing six reaction tubes with a diameter of 42 mm and a length of 10 meters was cleaned by sandblasting for 6 hours using three skilled workers. After cleaning, two reaction tubes had white spots attached, which did not meet the cleaning requirements and had to be cleaned again to meet the standards.

[0102] The cleaning device for the tubular fixed bed reactor in Example 1 was used for cleaning, wherein the battery length of the cleaning device was set to 60 cm, the outer diameter of the grinding wheel 1 was adjusted to 42 mm, and a total of six cleaning devices were used. The cleaning devices were placed in the reaction tubes in a manner such that the grinding wheel 1 was at the bottom and the guide wheel was at the top. The downward speed of the cleaning device was 2 m / h. It took a total of 5 hours for all six reaction tubes to meet the cleaning requirements.

[0103] Example 4

[0104] A stainless steel tubular reactor containing three reaction tubes with a diameter of 50 mm and a length of 12 meters was cleaned by three skilled workers and the sandblasting time was 9 hours. After cleaning, one reaction tube did not meet the cleaning requirements due to the attachment of red impurities. It met the standards after re-cleaning.

[0105] The cleaning device for the tubular fixed bed reactor in Example 1 was used for cleaning, wherein the battery length of the cleaning device was set to 80 cm, the outer diameter of the grinding wheel 1 was adjusted to 50 mm, and a total of three cleaning devices were used. The cleaning devices were placed in the reaction tubes in a manner such that the grinding wheel 1 was at the bottom and the guide wheel was at the top. The downward speed of the cleaning device was 1.5 m / h. It took a total of 8 hours for all three reaction tubes to meet the cleaning requirements.

[0106] The cleaning device for a tube-type fixed-bed reactor proposed in an embodiment of the present invention drives a grinding wheel 1 and a plurality of guide wheels 3 to work by a motor 2, thereby improving the cleaning accuracy and reliability of the inner wall of the tube, reducing the labor intensity of on-site manual cleaning, reducing the contact of on-site workers with dust, and reducing the health problems caused by dust.

[0107] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A cleaning device for a tubular fixed bed reactor, characterized in that: include: A grinding wheel is in the shape of a ring, the outer surface of which is adapted to the inner wall of the tube, and is used to clean the rust spots on the inner wall of the tube; A plurality of guide wheels, used for providing guiding thrust for the cleaning device to move along the tube array; A motor is rotatably connected to the grinding wheel and the plurality of guide wheels respectively; A battery is electrically connected to the motor and is used to provide electrical energy to the motor.

2. The cleaning device according to claim 1, characterized in that Also includes; The auxiliary support structure is cylindrical, with a grinding wheel and a battery clamping structure respectively arranged at the head and tail, and the motor and a plurality of guide wheels arranged at the middle; The grinding wheel and battery clamping structures are used for disassembling, clamping or replacing the grinding wheel and battery respectively; The grinding wheel comprises a plurality of grinding blocks, a plurality of length-adjustable support rods and a clamping member, each grinding block is in the shape of a fan ring, the clamping member is in the shape of a circular ring, the plurality of grinding blocks are arranged in the shape of a circular ring, and the axis of the circular ring coincides with the axis of the clamping member, the radial plane where the midpoint of the height is located coincides with the radial plane where the midpoint of the height of the clamping member is located, and the inner ring surface diameter is greater than the outer ring surface diameter of the clamping member; The inner annular surface of each grinding block is connected to the outer annular surface of the clamping member through a length-adjustable support rod; The motor is provided with a switch, a speed adjustment button and a reverse button. The switch is used to control the start and stop of the motor, the speed adjustment button is used to adjust the speed of the motor, and the reverse button is used to control the reverse of the motor.

3. The cleaning device according to claim 2, characterized in that: The multiple guide wheels are evenly distributed along the radial direction of the cleaning device, the plane where the wheel surface of each guide wheel is located is located on the radial surface of the cleaning device, and the wheel rim is in contact with the inner wall of the tube array.

4. The cleaning device according to claim 3, characterized in that: Also includes: A mechanical transmission device, comprising a first transmission device and a second transmission device; One end of the first transmission device is rotatably connected to the rotating shaft of the motor, and the other end is rotatably connected to the inner surface of the clamping member, and the first transmission device is used to convert the power of the motor into the rotational force of the grinding wheel; One end of the second transmission device is rotationally connected to the rotating shaft of the motor, and the other end is rotationally connected to the axle of each guide wheel. The second transmission device is used to convert the power of the motor into the guide thrust of the multiple guide wheels.

5. The cleaning device according to claim 4, characterized in that: Also includes: A plurality of retractable support structures, each of which is disposed on a guide wheel and is used to increase the contact force between the rim of the guide wheel and the inner wall of the tube array; The multiple retractable support structures cooperate with the second transmission device to adjust the diameter of the circle formed by the rims of the multiple guide wheels as the diameter of the tube array changes.

6. The cleaning device according to claim 5, characterized in that: Also includes: The controller is provided with a WIFI module and / or a Bluetooth module for receiving remote control instructions and controlling the start, shut down, speed adjustment or reversal of the motor through the control instructions.

7. The cleaning device according to claim 6, characterized in that: The controller is also provided with a power detection module and a timer; The power detection module is used to monitor the power of the battery and send the power to the remote control terminal through the WIFI module or the Bluetooth module; The timer is used to record the working time of the cleaning device and send the working time to the remote control terminal through the WIFI module or the Bluetooth module; The remote control terminal is any one of a mobile phone, a computer, a single chip microcomputer, and a DSP.

8. The cleaning device according to claim 2, characterized in that: The outer diameter of the cleaning device is 20-60 mm.

9. A method for using the cleaning device according to any one of claims 1 to 8, characterized in that: include: After the cleaning device is powered on, it is placed from above the tube array in a manner that the grinding wheel is at the bottom and multiple guide wheels are at the top; The motor drives a plurality of guide wheels, and the plurality of guide wheels push the cleaning device downward. Meanwhile, during the downward process, the motor drives the grinding wheel to clean the pipe wall. After the cleaning device drills out from under the tube array, it falls into the collector for collection.

10. The method according to claim 9, characterized in that During the downward movement of the cleaning device, the battery power is monitored in real time through the remote terminal. If the battery power drops rapidly, the motor speed is adjusted through the remote terminal, or the motor is controlled in reverse to make the cleaning device return to its original path and then replace the battery and / or grinding wheel.

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