Automatic unblocking device for slag discharge pipe of circulating fluidized bed boiler and use method thereof

Abstract

The present invention discloses an automatic unblocking device for a circulating fluidized bed boiler slag pipe and a method for using the device. The device includes a dredging device, a propulsion device, a rotary drive device, a PLC control system, and a power supply. The dredging device includes a dredging pipe and a spring tube. The dredging pipe is provided with an electric gate valve. The front end of the spring tube is rotatably connected to a drill bit, and the spring tube extends into the dredging pipe and the slag pipe. The propulsion device is provided with a plurality of horizontally arranged guide wheel groups, a first drive motor, and a meter. Each guide wheel group consists of an upper guide wheel and a lower guide wheel, and the spring tube is located between the upper and lower guide wheels. The spring tube is connected to the housing of the rotary drive device via a connecting sleeve. The rotary drive device is provided with a second drive motor and a flexible shaft. One end of the flexible shaft is connected to the shaft of the second drive motor, and the other end passes through the spring tube and is connected to the drill bit. The present invention can automatically dredge a clogged boiler slag pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of circulating fluidized bed boiler slag discharge equipment, and particularly relates to an automatic unblocking device for a circulating fluidized bed boiler slag discharge pipe and a use method thereof. Background Art

[0002] Circulating fluidized bed boilers must maintain a certain amount of waste slag as bed material, while also preventing excessive amounts. Failure to promptly remove waste slag can negatively impact the boiler's normal operation. Therefore, slag discharge is generally controlled by bed pressure. In recent years, to meet energy conservation and environmental protection requirements, the incorporation of sewage sludge, filter mud, and biomass fuels has become commonplace. The increasingly complex fuel composition has led to an increasing number of slag pipe blockages, and the causes of these blockages are becoming increasingly complex. Currently, manufacturers address slag pipe blockages by manually using a long iron rod to crush the slag through the working hole or by using a hammer or air hammer to tap the blocked pipe. However, manual slag removal using a long rod is inefficient, labor-intensive, and the waste slag is hot. The slag removal process can easily cause burns and safety accidents. Using a hammer or air hammer to tap the blocked pipe can cause pipe deformation over time, posing a safety hazard to boiler operation. Furthermore, the blocked pipe can become increasingly blocked by tapping, defeating the purpose of slag removal. Summary of the Invention

[0003] In response to the above-mentioned shortcomings, the present invention discloses an automatic unblocking device for a circulating fluidized bed boiler slag discharge pipe and a method for using the same, which effectively solves the problem of boiler slag discharge pipe blockage without the need for personnel to be present on-site for operation, thereby reducing safety risks such as scalding and burns to employees and improving the company's safety production rate.

[0004] The present invention is achieved by adopting the following technical solutions:

[0005] An automatic unblocking device for a slag discharge pipe of a circulating fluidized bed boiler, comprising a unblocking device, a propulsion device, a rotary drive device, a PLC control system and a power supply;

[0006] The dredging device includes a dredging pipe and a spring tube; one end of the dredging pipe is connected to the slag discharge pipe at the bottom of the boiler, and the other end is sealed by a baffle with a central opening. The dredging pipe is provided with an electric gate valve; the front end of the spring tube is rotatably connected to a drill bit, and the spring tube passes through the hole in the head into the dredging pipe and then extends into the slag discharge pipe through the dredging pipe;

[0007] The propulsion device is provided with a plurality of horizontally arranged guide wheel groups, a first drive motor and a meter counter; each guide wheel group is composed of an upper guide wheel and a lower guide wheel, and the spring tube is located between the upper guide wheel and the lower guide wheel and is in contact with them; the first drive motor drives the upper guide wheel and the lower guide wheel to cooperate with each other to drive the spring tube forward or backward; the meter counter is used to measure the forward or backward length of the spring tube, and the forward length of the spring tube is monitored in real time by the meter counter to prevent the spring tube and the drill bit from extending into the furnace of the boiler, so as to prevent the high temperature of the furnace from damaging the spring and the drill bit;

[0008] The spring tube is connected to the housing of the rotary drive device through a connecting sleeve. The rotary drive device is provided with a second drive motor and a flexible shaft. One end of the flexible shaft is connected to the shaft of the second drive motor, and the other end passes through the spring tube and is connected to the drill bit.

[0009] The PLC control system is respectively connected to the first drive motor, the second drive motor, the meter counter, the electric gate valve and the power supply;

[0010] The power supply is connected to the first drive motor, the second drive motor, the meter counter and the electric gate valve respectively.

[0011] Furthermore, grooves are provided on the surfaces of the upper guide wheel and the lower guide wheel. By providing grooves on the surfaces of the upper guide wheel or the lower guide wheel, the friction between the upper guide wheel and the lower guide wheel and the spring tube can be increased, which is conducive to promoting the movement of the spring tube.

[0012] Furthermore, the angle between the dredging pipe and the slag discharge pipe is 30° to 45°. Setting the angle between the dredging pipe and the slag discharge pipe is conducive to the spring tube extending into the slag discharge pipe for dredging.

[0013] Furthermore, a slag collecting device is provided between the dredge pipe and the propulsion device. The slag collecting device comprises a box body with an open top, a discharge port provided at the bottom of the box body, and a flange seal at the top of the box body. An upwardly inclined inlet pipe is provided on one side of the box body, and an outlet pipe is symmetrically provided on the other side. The inlet pipe is connected to the baffle of the dredge pipe via a flange. A support leg is provided at the bottom of the box body. The spring tube passes through the outlet pipe into the box body and then passes through the inlet pipe and into the dredge pipe. Adding a slag collecting device is beneficial for collecting boiler slag entrained by the spring tube when it exits. The boiler slag can enter the box body along the inclined inlet pipe.

[0014] Furthermore, bristles are provided on the inner wall of the box, and the bristles are arranged around the connection between the outlet pipe and the box. When the spring tube exits the slag collecting device, the bristles can clean the boiler slag adhered to the spring tube and make the boiler slag fall into the box.

[0015] Furthermore, the outlet pipe is divided into an outer pipe and an inner pipe. The inner pipe is connected to the housing, and the outer pipe is used to pass a cooling fluid. The upper portion of the outer pipe is provided with a cooling fluid outlet, and the lower portion of the outer pipe is provided with a cooling fluid inlet. Cooling water, air, or nitrogen is passed into the outer pipe to cool the spring tube portion passing through the outlet pipe, preventing high temperature damage to the subsequent propulsion device and rotary drive device, and reducing the risk of burns to operators.

[0016] Furthermore, the outer surface of the box is wrapped with heat insulation cotton.

[0017] The method for using the automatic unblocking device for a slag discharge pipe of a circulating fluidized bed boiler comprises the following steps:

[0018] S1. Monitoring the changes in boiler bed pressure during boiler slagging through the boiler DCS system. If the pressure exceeds the normal range, it is determined that the boiler's slagging pipe is blocked. An operator or the boiler DCS system automatically sends a clearing instruction to the PLC control system of the circulating fluidized bed boiler slagging pipe automatic clearing device.

[0019] S2. After receiving the dredging instruction, the PLC control system first controls the electric gate valve to open, then controls the second drive motor to open, the second drive motor drives the flexible shaft to drive the drill bit to rotate, and then controls the first drive motor to open, the first drive motor drives the guide wheel assembly to drive the spring tube forward, and the spring tube drives the drill bit to move from the initial position at the baffle of the dredging tube through the dredging tube into the slag discharge tube. At the same time, the meter measures the forward length of the spring tube in real time and sends the length data to the PLC control system. When the forward length of the spring tube is equal to or close to the distance the drill bit moves from the dredging tube to the connection between the slag discharge tube and the boiler, the PLC control system controls the first drive motor to stop;

[0020] S3: The PLC control system controls the first drive motor to reverse and drive the guide wheel assembly to withdraw the spring tube. At the same time, the meter measures the withdrawal length of the spring tube in real time. When the forward length of the spring tube is equal to or close to the distance the drill bit moves from the dredging pipe to the connection between the slag discharge pipe and the boiler, the PLC control system controls the first drive motor to stop. At this time, the spring tube drives the drill bit to withdraw to the initial position at the dredging pipe baffle.

[0021] S4. Loop through steps S2 to S3. When the boiler bed pressure monitored by the boiler DCS system reaches the normal pressure range, a dredging completion instruction is sent to the PLC control system. After receiving the dredging completion instruction, the PLC control system controls the first drive motor to drive the spring tube and the drill bit to move to the initial position. Then, the PLC control system controls the first drive motor and the second drive motor to turn off, and simultaneously controls the electric gate valve to close.

[0022] Furthermore, the speed of the second drive motor is controlled between 600 and 800 rpm, the diameter of the drill bit is between 60 and 100 mm, and the diameter of the spring tube is 1 / 4 of the drill bit diameter. The second drive motor's high speed can drive the drill bit to perform dredging operations quickly, but severe boiler ash blockage creates significant resistance to dredging, which can deform and damage the spring. The spring diameter affects the drill bit's supporting force, which in turn determines the speed of dredging. A small drill bit can quickly penetrate the slag layer, but requires multiple back-and-forth drilling passes, which is inefficient. A large drill bit, while reducing the number of back-and-forth drilling passes, is less effective at penetrating the slag layer and can easily damage the spring and drill bit.

[0023] Furthermore, the forward or backward speed of the spring tube is controlled at 1 to 2 meters per minute.

[0024] Compared with the existing technology, this technical solution has the following beneficial effects:

[0025] The present invention effectively solves the problem of blockage in the boiler slag discharge process. Through the mutual cooperation of the propulsion device and the rotary drive device, the spring tube connected to the rotary drill bit is driven to move in the slag discharge pipe of the boiler, thereby clearing the slag material blocked in the slag discharge pipe. The slag clearing efficiency is high, the slag can be cleared quickly, and the safe operation of the boiler is not affected. At the same time, during the dredging process, no personnel need to be present to work on site, which reduces the safety risks of scalding and burns to employees and improves the safety productivity of the enterprise. Moreover, the dredging process is simple to operate and can be operated by the DCS position, which greatly reduces the labor intensity of employees. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the automatic unblocking device for the slag discharge pipe of a circulating fluidized bed boiler described in Example 1.

[0027] Figure 2 It is a structural schematic diagram of the automatic unblocking device for the slag discharge pipe of a circulating fluidized bed boiler described in Example 2.

[0028] Figure markings: 1-slag discharge pipe, 2-dredge pipe, 3-spring tube, 4-baffle, 5-electric gate valve, 6-drill bit, 7-upper guide wheel, 8-lower guide wheel, 9-meter counter, 10-connecting sleeve, 11-second drive motor, 12-inner tube, 13-flexible shaft, 14-PLC control system, 15-box, 16-discharge port, 17-flange, 18-inlet pipe, 19-outer tube, 20-support foot, 21-brush. DETAILED DESCRIPTION

[0029] The present invention is further illustrated by the following examples, which are not intended to limit the present invention. Specific experimental conditions and methods not specified in the following examples are conventional methods well known to those skilled in the art.

[0030] Example 1: An automatic unblocking device for a slag discharge pipe of a circulating fluidized bed boiler, comprising a unblocking device, a propulsion device, a rotary drive device, a PLC control system 14 and a power supply;

[0031] The dredging device includes a dredging pipe 2 and a spring tube 3; one end of the dredging pipe 2 is connected to the slag discharge pipe 1 at the bottom of the boiler, and the other end is sealed with a baffle 4 with a central opening. The dredging pipe 2 is provided with an electric gate valve 5; the front end of the spring tube 3 is rotatably connected to a drill bit 6, and the spring tube 3 penetrates into the dredging pipe 2 from the hole in the head and extends into the slag discharge pipe 1 through the dredging pipe 2; the angle between the dredging pipe 2 and the slag discharge pipe 1 is 30°.

[0032] The propulsion device is provided with a plurality of horizontally arranged guide wheel groups, a first drive motor and a meter counter 9; each guide wheel group is composed of an upper guide wheel 7 and a lower guide wheel 8, and the spring tube 3 is located between the upper guide wheel 7 and the lower guide wheel 8 and is in close contact with them; the first drive motor drives the upper guide wheel 7 and the lower guide wheel 8 to cooperate with each other to drive the spring tube 3 forward or backward; the meter counter 9 is used to measure the forward or backward length of the spring tube 3; grooves are provided on the surfaces of the upper guide wheel 7 and the lower guide wheel 8;

[0033] The spring tube 3 is connected to the housing of the rotary drive device through a connecting sleeve 10. The rotary drive device is provided with a second drive motor 11 and a flexible shaft 13. One end of the flexible shaft 13 is connected to the shaft of the second drive motor 11, and the other end passes through the spring tube 3 and is connected to the drill bit 6.

[0034] The PLC control system 14 is connected to the first drive motor, the second drive motor 11, the meter counter 9, the electric gate valve 5 and the power supply respectively;

[0035] The power supply is connected to the first drive motor, the second drive motor 11, the meter counter 9 and the electric gate valve 5 respectively;

[0036] The spring tube 3 is made of metal, the drill bit 6 is a ball-tooth spiral plum-shaped composite drill bit 6, and the flexible shaft 13 can be a steel wire flexible shaft 13.

[0037] The method for using the automatic unblocking device for a slag discharge pipe of a circulating fluidized bed boiler described in this embodiment comprises the following steps:

[0038] S1. The boiler bed pressure changes during the boiler slagging process are monitored by the boiler DCS system. If the pressure exceeds the normal range, it is determined that the boiler slagging pipe 1 is blocked. The operator or the boiler DCS system automatically sends a clearing instruction to the PLC control system 14 of the circulating fluidized bed boiler slagging pipe automatic clearing device;

[0039] S2. After receiving the dredging instruction, the PLC control system 14 first controls the electric gate valve 5 to open, and then controls the second drive motor 11 to open. The second drive motor 11 drives the flexible shaft 13 to drive the drill bit 6 to rotate, and then controls the first drive motor to open. The first drive motor drives the guide wheel group to drive the spring tube 3 forward. The spring tube 3 drives the drill bit 6 from the initial position at the baffle 4 of the dredging pipe 2 to move into the slag discharge pipe 1 through the dredging pipe 2. At the same time, the meter 9 measures the forward length of the spring tube 3 in real time and sends the length data to the PLC control system 14. When the forward length of the spring tube 3 is equal to or greater than When the drill bit 6 moves from the dredging pipe 2 to the distance between the slag discharge pipe 1 and the boiler, the PLC control system 14 controls the first drive motor to stop; S3, the PLC control system 14 controls the first drive motor to reverse and drive the guide wheel group to drive the spring tube 3 to withdraw, and at the same time the meter 9 measures the withdrawal length of the spring tube 3 in real time. When the forward length of the spring tube 3 is equal to or close to the distance between the drill bit 6 and the slag discharge pipe 1 and the boiler, the PLC control system 14 controls the first drive motor to stop, and at this time the spring tube 3 drives the drill bit 6 to withdraw to the initial position at the baffle 4 of the dredging pipe 2;

[0040] S4. Steps S2 to S3 are repeated repeatedly. When the boiler bed pressure monitored by the boiler DCS system reaches the normal pressure range, a dredging completion instruction is sent to the PLC control system 14. After receiving the dredging completion instruction, the PLC control system 14 controls the first drive motor to drive the spring tube 3 and the drill bit 6 to move to the initial position. Then, the PLC control system 14 controls the first drive motor and the second drive motor 11 to turn off, and simultaneously controls the electric gate valve 5 to close.

[0041] The speed of the second drive motor 11 is controlled at 725 rpm, the diameter of the drill bit 6 is 80 mm, and the diameter of the spring tube 3 is 1 / 4 of the diameter of the drill bit 6;

[0042] The forward or backward speed of the spring tube 3 is controlled at 1.5 m / min.

[0043] Taking the diameter of the boiler slag discharge pipe 1 as DN200 as an example, the slag clearing operation can be completed within 5 minutes by dredging according to the method of the present invention, and normal slag discharge can be restored. Compared with the 30 to 60 minutes of manual slag clearing operation, the operation efficiency is greatly improved, the labor intensity of employees is reduced, and safety hazards are reduced.

[0044] Example 2: The difference between the automatic unblocking device for the slag discharge pipe of a circulating fluidized bed boiler described in this example and the device described in Example 1 is that the angle between the dredging pipe 2 and the slag discharge pipe 1 is 35°, and a slag collecting device is provided between the dredging pipe 2 and the propulsion device. The slag collecting device includes a box body 15 with an upper end opening, a discharge port 16 is provided at the bottom of the box body 15, and the upper end of the box body 15 is sealed by a flange 17. An upwardly inclined inlet pipe 18 is provided on one side of the box body 15, and an outlet pipe is symmetrically provided on the other side. The inlet pipe 18 and the baffle of the dredging pipe 2 are connected. 4 is connected by a flange, and a support leg 20 is provided at the lower part of the box body 15. The spring tube 3 passes through the outlet pipe into the box body 15 and then passes through the inlet pipe 18 to enter the dredging pipe 2; bristles 21 are provided on the inner wall of the box body 15, and the bristles 21 are arranged around the connection between the outlet pipe and the box body 15; the outlet pipe is divided into an outer pipe 19 and an inner pipe 12, and the inner pipe 12 is connected to the box body 15. The outer pipe 19 is used to pass the cold fluid, and the upper part of the outer pipe 19 is provided with an outlet for the cold fluid, and the lower part of the outer pipe 19 is provided with an inlet for the cold fluid.

[0045] The method of using the automatic unblocking device for the slag discharge pipe of a circulating fluidized bed boiler described in this embodiment differs from the method of using described in Example 1 only in that, when the spring tube 3 exits, the boiler slag carried therewith enters the box 15 along the inlet pipe 18 for collection, and when the spring tube 3 exits the slag collecting device, the bristles 21 clean the boiler slag adhering to the spring tube 3, causing the boiler slag to fall into the box 15; cooling water is introduced into the outer tube 19 to cool the part of the spring tube 3 passing through the outlet pipe; the speed of the second drive motor 11 is controlled at 600 rpm, the diameter of the drill bit 6 is 60 mm, the diameter of the spring tube 3 is 1 / 4 of the diameter of the drill bit 6, and the forward or backward speed of the spring tube 3 is controlled at 1 m / min.

[0046] Example 3: The difference between the automatic unblocking device for the slag discharge pipe of a circulating fluidized bed boiler described in this example and the device described in Example 2 is only that the angle between the unblocking pipe 2 and the slag discharge pipe 1 is 45°, and the outer surface of the box body 15 is wrapped with insulation cotton.

[0047] The method of using the automatic unblocking device for the slag discharge pipe of a circulating fluidized bed boiler described in this embodiment differs from the method of using described in Example 1 only in that the rotation speed of the second drive motor 11 is controlled at 800 rpm, the diameter of the drill bit 6 is 100 mm, the diameter of the spring tube 3 is 1 / 4 of the diameter of the drill bit 6, and the forward or backward speed of the spring tube 3 is controlled at 2 m / min.

[0048] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An automatic unblocking device for a slag discharge pipe of a circulating fluidized bed boiler, characterized by: The invention comprises a dredging device, a propulsion device, a rotary drive device, a PLC control system (14) and a power supply; the dredging device comprises a dredging pipe (2) and a spring tube (3); one end of the dredging pipe (2) is connected to the slag discharge pipe (1) at the bottom of the boiler, and the other end is sealed by a baffle (4) with a central opening, and the dredging pipe (2) is provided with an electric gate valve (5); the front end of the spring tube (3) is rotatably connected to a drill bit (6), and the spring tube (3) penetrates from the hole of the baffle (4) into the dredging pipe (2) and extends into the slag discharge pipe (1) through the dredging pipe (2); the propulsion device is provided with a plurality of horizontally arranged guide wheel groups, a first drive motor and a meter (9); each guide wheel group consists of an upper guide wheel (7) and a lower guide wheel (8), and the spring tube (3) is located between the upper guide wheel (7) and the lower guide wheel (8) and is connected to them. The first drive motor drives the upper guide wheel (7) and the lower guide wheel (8) to cooperate with each other to drive the spring tube (3) to move forward or backward; the meter (9) is used to measure the length of the spring tube (3) moving forward or backward; the spring tube (3) is connected to the housing of the rotary drive device through a connecting sleeve (10); the rotary drive device is provided with a second drive motor (11) and a flexible shaft (13); one end of the flexible shaft (13) is connected to the shaft of the second drive motor (11), and the other end passes through the spring tube (3) and is connected to the drill bit (6); the PLC control system (14) is respectively connected to the first drive motor, the second drive motor (11), the meter (9), the electric gate valve (5) and the power supply; the power supply is respectively connected to the first drive motor, the second drive motor (11), the meter (9) and the electric gate valve (5); Grooves are provided on the surfaces of the upper guide wheel (7) and the lower guide wheel (8); A slag collecting device is provided between the dredging pipe (2) and the propulsion device, and the slag collecting device comprises a box body (15) with an upper end opening, a discharge port (16) is provided at the bottom of the box body (15), the upper end of the box body (15) is sealed by a flange (17), an upwardly inclined inlet pipe (18) is provided on one side of the box body (15), and an outlet pipe is symmetrically provided on the other side, the inlet pipe (18) is connected to the baffle (4) of the dredging pipe (2) through a flange, and a support leg (20) is provided at the lower part of the box body (15), and the spring tube (3) passes through the outlet pipe into the box body (15) and then passes through the inlet pipe (18) to enter the dredging pipe (2).

2. The automatic unblocking device for a slag discharge pipe of a circulating fluidized bed boiler according to claim 1, characterized in that: The angle between the dredging pipe (2) and the slag discharge pipe (1) is 30° to 45°.

3. The automatic unblocking device for a slag discharge pipe of a circulating fluidized bed boiler according to claim 1, characterized in that: Brushes (21) are provided on the inner wall of the box body (15), and the brushes (21) are arranged around the connection between the outlet pipe and the box body (15).

4. The automatic unblocking device for a slag discharge pipe of a circulating fluidized bed boiler according to claim 1, characterized in that: The outlet pipe is divided into an outer pipe (19) and an inner pipe (12). The inner pipe (12) is connected to the box (15). The outer pipe (19) is used to pass a cold fluid. The upper part of the outer pipe (19) is provided with an outlet for the cold fluid, and the lower part of the outer pipe (19) is provided with an inlet for the cold fluid.

5. The automatic unblocking device for a slag discharge pipe of a circulating fluidized bed boiler according to claim 1, characterized in that: The outer surface of the box body (15) is wrapped with heat insulation cotton.

6. The method for using the automatic unblocking device for a slag discharge pipe of a circulating fluidized bed boiler according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Monitoring the change of boiler bed pressure during boiler slagging through the boiler DCS system. If the pressure exceeds the normal pressure range, it is determined that the boiler slagging pipe (1) is blocked, and an operator or the boiler DCS system automatically sends a clearing instruction to the PLC control system (14) of the circulating fluidized bed boiler slagging pipe automatic clearing device; S2. After receiving the dredging instruction, the PLC control system (14) first controls the electric gate valve (5) to open, and then controls the second drive motor (11) to open. The second drive motor (11) drives the flexible shaft (13) to drive the drill bit (6) to rotate. Then, the first drive motor is controlled to open. The first drive motor drives the guide wheel group to drive the spring tube (3) forward. The spring tube (3) drives the drill bit (6) to move from the initial position at the baffle (4) of the dredging tube (2) through the dredging tube (2) to the inside of the slag discharge tube (1). At the same time, the meter (9) measures the forward length of the spring tube (3) in real time and sends the length data to the PLC control system (14). When the forward length of the spring tube (3) is equal to or close to the distance between the drill bit (6) and the connection between the dredging tube (2) and the slag discharge tube (1) and the boiler, the PLC control system (14) controls the first drive motor to stop. S3, the PLC control system (14) controls the first drive motor to reverse and drive the guide wheel group to drive the spring tube (3) to withdraw, and at the same time the meter (9) measures the withdrawal length of the spring tube (3) in real time. When the forward length of the spring tube (3) is equal to or close to the distance between the drill bit (6) and the connection between the dredging pipe (2) and the slag discharge pipe (1) and the boiler, the PLC control system (14) controls the first drive motor to stop, and at this time the spring tube (3) drives the drill bit (6) to withdraw to the initial position at the baffle (4) of the dredging pipe (2); S4, looping through steps S2 to S3, when the boiler bed pressure monitored by the boiler DCS system reaches the normal pressure range, sending a dredging completion instruction to the PLC control system (14), after receiving the dredging completion instruction, the PLC control system (14) controls the first drive motor to drive the spring tube (3) and the drill bit (6) to move to the initial position, and then the PLC control system (14) controls the first drive motor and the second drive motor (11) to turn off, and simultaneously controls the electric gate valve (5) to turn off.

7. The method of use according to claim 6, characterized in that: The rotation speed of the second drive motor (11) is controlled at 600-800 rpm, the diameter of the drill bit (6) is 60-100 mm, and the diameter of the spring tube (3) is 1 / 4 of the diameter of the drill bit (6).

8. The method of use according to claim 6, characterized in that: The forward or backward speed of the spring tube (3) is controlled at 1 to 2 meters per minute.

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