Blast furnace body static pressure tapping pipe dredging system

Abstract

The utility model discloses a dredging system for static pressure tapping pipes of a blast furnace body, which is structurally characterized in that a pressure measuring blowback pipe arranged on each pressure tapping pipe is connected with an external nitrogen device sequentially through a pressure transmitter and a control valve, and each pressure tapping pipe is correspondingly provided with an electric screw dredging device. A drill rod, provided with a drill bit, of the electric screw dredging device can reciprocate in the corresponding pressure tapping pipe; a motor of each electric screw dredging device is sequentially connected with a motor controller and an acquisition module; all the acquisition modules and the control valves are connected with a computer through a PLC (Programmable Logic Controller); the operation parameters of the electric screw dredging device are collected through the computer, the computer controls the electric screw dredging device to execute the cleaning action on the pressure tapping pipe, the cleaning effect can be evaluated in real time, and dredging control is continuously optimized.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnace ironmaking, and relates to a dredging system for static pressure tapping pipes on the furnace body of a blast furnace. Background Art

[0002] During the blast furnace ironmaking process, real-time online monitoring of the furnace pressure at different parts inside the furnace is an important means to assist in judging the smelting conditions inside the blast furnace. The method of measuring the pressure inside the blast furnace hearth is to measure the pressure inside the furnace through a pressure tapping pipe inserted into the furnace hearth and via a pressure transmitter. Since there are a large amount of dust, molten substances, etc. inside the blast furnace hearth, the pressure tapping pipes inserted into the furnace hearth are very easy to be blocked, resulting in failure of pressure measurement. In order to ensure the smoothness of the pressure tapping pipes, high-pressure nitrogen higher than the furnace pressure needs to be continuously introduced into the pressure tapping pipes, and the flow rate needs to be maintained above 200 L / min to ensure that the pressure tapping pipes are not blocked. Since there are many pressure tapping points in the blast furnace hearth, a blast furnace has 12 - 18 pressure tapping points, and the consumption of nitrogen is 150 - 200 m 3 / h, with huge consumption! It causes great cost pressure on users to continuously use the static pressure system of the blast furnace furnace body. Therefore, a more effective, reliable, and low-cost pressure tapping pipe dredging method is needed. A method of dredging the pressure tapping pipe through a cylinder has also been disclosed (Patent CN201410230189), but this method has a single dredging method and cannot rotate and break the blockage, and the dredging ability is very limited; there is also a method of dredging through a spiral blade plus a pneumatic device that has been disclosed (CN202010283131). Although it has the functions of rotation and reciprocation, the spiral blade has limited crushing ability for stubborn blockages, and this method has a complex structure. In addition, the most important defect of these two methods is that nitrogen continuous purging is still required to ensure that the pressure tapping pipes are not blocked, and the purpose of reducing the use cost for users has not been achieved. Moreover, these methods are all open-loop control methods, which belong to blind dredging, and the situation of the pipeline dredging and the effect after dredging cannot be evaluated. Only when the pressure tapping pipe is completely blocked and no pressure can be obtained on the pressure tapping pipe, can the user know. At this time, this pressure tapping point cannot be used, and only when the furnace is stopped for blowing down, the device is opened for manual dredging. Since this completely solidified blockage is very tough and difficult to remove, a large amount of manpower and material resources are required for dredging. Summary of the Invention

[0003] Aiming at the above deficiencies existing in the current prior art, the purpose of the utility model is to provide a dredging system for static pressure tapping pipes on the furnace body of a blast furnace. The utility model collects the operation parameters of an electric screw dredging device through a computer, controls the electric screw dredging device by the computer to perform the cleaning action on the pressure tapping pipe, and can evaluate the cleaning effect in real time and continuously optimize the dredging control.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A blast furnace shaft static pressure tapping pipe dredging system includes a computer, a PLC, several acquisition modules, several pressure transmitters, several control valves, several motor controllers, several electric screw dredging devices, and several tapping pipes. All the tapping pipes are respectively installed on the furnace wall of the blast furnace, and the ends of the tapping pipes extend into the blast furnace hearth, while the fronts of the tapping pipes are outside the furnace wall of the blast furnace. It is characterized in that: the pressure measuring and backwashing pipes provided for each tapping pipe are sequentially connected to an external nitrogen device through a pressure transmitter and a control valve, an electric screw dredging device is correspondingly installed for each tapping pipe, and the drill rod with a drill bit of the electric screw dredging device can reciprocate in the corresponding tapping pipe; the motor of each electric screw dredging device is sequentially connected to a motor controller and an acquisition module, and all the acquisition modules and control valves are connected to the computer through the PLC.

[0006] The parameters of the automatic dredging program are set through the computer, and the parameters include the cleaning cycle and the number of cleaning cycles; the cleaning cycle refers to the interval time between two cleanings; the number of cleaning cycles is the number of times the electric screw dredging device extends out of the tapping pipe for cleaning during one cleaning cycle. When the set cleaning cycle is reached, the computer controls the electric screw dredging device to start and extend out for the cleaning operation. At the same time, the nitrogen control valve is opened, and high-pressure nitrogen is introduced through the tapping pipe for purging. After the cleaning cycle ends, the electric screw dredging device stops working, the nitrogen control valve is closed, and it waits for the next cleaning cycle.

[0007] During the whole cleaning process, the output current and the number of rotation turns of the electric screw dredging device are continuously collected through the computer to judge the crushing difficulty of the blockage and the cleaning effect, so as to automatically correct the cleaning cycle and the number of cleaning cycles of the dredging program, ensure the best cleaning effect, and keep the tapping pipe in a smooth state all the time.

[0008] The electric screw dredging device includes a drill bit, a drill rod, a connecting piece, a sealing piston, a screw, a coupling, a motor, a support rod assembly, a slip ring, a connecting flange, and a nut; the drill bit is installed at the head of the drill rod, and the drill bit can be disassembled from the drill rod for convenient replacement; the drill rod is connected to the connecting piece, and the drill rod can be disassembled from the connecting piece for convenient replacement; the connecting piece is connected to the sealing piston, the sealing piston is connected to the screw through the nut, the sealing piston is placed in the tapping pipe, and the screw is connected to the motor through the coupling; the motor is installed on four slip rings, the connecting flange and the four slip rings are respectively installed on the support rod assembly composed of four support rods, and the four slip rings can slide on the support rod assembly. Through the four slip rings, the motor can slide along the support rod assembly; the nut is installed on the connecting flange.

[0009] The core point of the electric screw dredging device is that the motor directly drives the screw to rotate. Through the interaction between the screw and the nut, the screw is simultaneously pushed to move reciprocally. Thus, the drill bit installed at the head of the drill pipe can perform reciprocating motion while rotating, giving full play to the dual functions of the drill bit in rotary crushing and forward pushing. When it is necessary to clean the pressure-taking pipe, the motor rotates forward, driving the screw to rotate forward. The screw drives the drill pipe to rotate forward through the piston and the connecting piece. At the same time, the screw and the nut interact with each other, pushing the screw forward, and thus pushing the drill pipe forward. At this time, the drill bit rotates and moves forward simultaneously, exerting a dual effect of rotary crushing and forward pushing on the sediment in the pressure-taking pipe. Meanwhile, through the pressure-measuring and back-blowing pipe, high-pressure nitrogen is introduced to further blow away the crushed sediment. When the drill bit moves forward to the predetermined position of the pressure-taking pipe, the motor starts to rotate in reverse, driving the drill pipe to move back through the screw. After reaching the starting position, the motor stops, and the high-pressure nitrogen introduced into the pressure-measuring and back-blowing pipe also stops purging, and a cleaning cycle is completed. When waiting for the next cleaning cycle, repeat the above cleaning actions.

[0010] The four support rods of the support rod assembly are respectively connected to the connecting flange and the support rod connecting piece to form an integral body.

[0011] The electric screw dredging device further includes a dust-proof bellows, which is installed between the motor and the connecting flange. It prevents dust from depositing on the screw, causing jamming when the screw and the nut interact.

[0012] The nut is a threaded nut, a ball nut or a roller nut.

[0013] An automatic dredging method using the above-mentioned blast furnace hearth static pressure-taking pipe dredging system is characterized by the following steps:

[0014] Step 1: Set the parameters of the automatic dredging program through a computer. The parameters include the cleaning cycle and the number of cleaning cycles. The cleaning cycle refers to the interval time between two cleanings. The number of cleaning cycles is the number of times the electric screw dredging device cleans the pressure-taking pipe forward in one cleaning cycle.

[0015] Step 2: When the set cleaning cycle is reached, the computer controls the motor of the electric screw dredging device to rotate forward, driving the screw to rotate forward. The screw drives the drill pipe to rotate forward through the piston and the connecting piece. At the same time, the screw and the nut interact to push the screw forward, thus driving the drill pipe forward. At this time, while the drill bit is rotating, it moves forward, playing a dual role of rotating and breaking and pushing forward the sediment in the pressure-taking pipe. At the same time, nitrogen is introduced through the pressure-measuring and back-blowing pipe to further blow away the broken sediment. When the drill bit moves forward to the predetermined position of the pressure-taking pipe, the motor starts to rotate in reverse, driving the drill pipe to move back through the screw. After reaching the starting position, the motor stops, completing one cleaning cycle. If multiple cleaning cycle times are set, the cleaning cycle will be carried out again according to the setting until the set number of cleaning cycles is completed.

[0016] During the cleaning cycle in Step 2 above, when the computer controls to turn on the electric screw dredging device, the computer collects the operating parameters of the electric screw dredging device through the acquisition module to automatically correct the parameters of the dredging program and evaluate the cleaning effect. The specific steps are as follows:

[0017] Step A: When the static pressure system of the blast furnace hearth is just installed, or when there is no blockage in the pressure-taking pipe, the electric screw dredging device performs a cleaning of the pressure-taking pipe. The computer automatically records the output current and the number of rotation cycles of the electric screw dredging device in this state as the initial operating parameters of the pressure-taking pipe. The output current is related to the output torque of the electric screw dredging device. The larger the output current, the larger the output torque, indicating that the blockage is more difficult to break. The number of rotation cycles is related to the forward position of the drill bit. When the drill bit reaches the outlet of the pressure-taking pipe, the number of rotation cycles of the motor represents the normal position that the drill bit can reach forward, that is, the position that the drill bit can reach when the pressure-taking pipe is not blocked.

[0018] Step B: Set the parameters of the initial cleaning cycle and the number of cleaning cycles of the dredging program on the computer in advance. The cleaning cycle is 1 - 24 hours, and the number of cleaning cycles is 1 - 5 times. The specific values depend on the operating conditions of the on-site blast furnace.

[0019] Step C: During the operation of the dredging program, the output current and the number of rotation cycles of the electric screw dredging device are monitored in real time to adjust the parameters of the dredging program in real time and judge the cleaning effect.

[0020] During the operation of the dredging program in Step C above, the output current of the electric screw dredging device is monitored in real time to judge the blockage situation of the pressure-taking pipe and appropriately adjust the parameters of the dredging program. There are the following specific situations:

[0021] 1. If the output current is 120%-150% of the initial output current of the pressure tapping tube, it indicates that blockage deposits in the pressure tapping tube start to accumulate. After completing this cleaning cycle, adjust the dredging program parameters: reduce the cleaning cycle of the dredging program by 30% to increase the cleaning frequency;

[0022] 2. If the output current is greater than 150% of the initial output current of the pressure tapping tube, it indicates that the accumulation of blockage in the pressure tapping tube starts to become serious. Then, immediately perform another cleaning cycle and continuously monitor the output current until the output current during the cleaning cycle is less than 150% of the initial output current, then stop the cleaning cycle; after completing this cleaning cycle, adjust the dredging program parameters: reduce the cleaning cycle of the dredging program by 50% and increase the number of cleaning cycles by 1 to increase the cleaning intensity;

[0023] 3. If the output current continuously remains greater than 150% of the initial output current of the pressure tapping tube, and at the same time, it is monitored that the number of rotation cycles when the motor rotates forward is less than the initial position value of the pressure tapping tube, it indicates that the drill bit is stuck. Then, stop the motor, immediately reverse and retreat, and perform another cleaning cycle; after continuously cleaning 5 times, if the number of rotation cycles of the motor is equal to the initial position value of the pressure tapping tube, complete this cleaning cycle, adjust the dredging program parameters: reduce the cleaning cycle of the dredging program by 50% and increase the number of cleaning cycles by 2 to further increase the cleaning intensity; after continuously cleaning 5 times, if the number of rotation cycles of the motor is still less than the initial position value of the pressure tapping tube and the drill bit is still stuck, then give an alarm output to prompt that manual intervention is required.

[0024] During the operation of the dredging program in step C, the number of rotation cycles of the motor of the electric screw dredging device is monitored in real time to determine whether the drill bit can extend forward to the normal position, so as to evaluate the cleaning effect; specifically, there are the following situations:

[0025] 1. If the monitoring shows that the drill bit extends forward to the normal position, it indicates that the cleaning this time reaches the expected effect;

[0026] 2. If the monitoring finds that the drill bit does not extend forward to the normal position, it indicates that the cleaning this time does not reach the expected effect. At this time, there will also be a situation where the motor current continuously remains greater than 150% of the initial output current of the pressure tapping tube, which indicates that the drill bit is stuck. Then, the motor immediately reverses and repeats a cleaning action; after continuously cleaning 5 times, if the number of rotation cycles of the motor is equal to the initial position value of the pressure tapping tube, it indicates that the cleaning this time reaches the expected effect; after continuously cleaning 5 times, if the number of rotation cycles of the motor is still less than the initial position value of the pressure tapping tube, it indicates that the cleaning this time does not reach the expected effect and the drill bit is still stuck, then give an alarm output to prompt that manual intervention is required.

[0027] The utility model realizes the on-demand automatic dredging of the pressure-taking pipe, can always ensure the smoothness of the pressure-taking pipe, solves the problem of a large amount of nitrogen consumption caused by the traditional continuous nitrogen purging to prevent the blockage of the pressure-taking pipe, and achieves the purpose of minimizing the nitrogen consumption on the premise of ensuring the continuous smoothness of the pressure-taking pipe. After measurement, under good furnace conditions, the utility model will reduce the nitrogen consumption by up to 90%, and at least can also reduce the nitrogen consumption by 50%, which can truly save a large amount of nitrogen usage cost for users. Brief Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the pressure-taking pipe dredging system for the static pressure of the blast furnace shaft of the utility model.

[0029] Figure 2 It is a schematic diagram of the electric screw dredging device of the utility model. Detailed Embodiment

[0030] The following further elaborates on the utility model in detail in conjunction with the drawings and specific embodiments, which is convenient for clearly understanding the utility model, but they do not constitute a limitation to the utility model. The computer, PLC, acquisition module, pressure transmitter, control valve, and motor controller of the utility model are all existing structures and can be directly purchased. Each component of the electric screw dredging device 8 is also an existing structure and can be directly purchased.

[0031] As Figure 1 shown, a pressure-taking pipe dredging system for the static pressure of the blast furnace shaft of the utility model includes a computer 1, a PLC 2, a plurality of acquisition modules 3, a plurality of pressure transmitters 4, a plurality of control valves 6, a plurality of motor controllers 7, a plurality of electric screw dredging devices 8, and a plurality of pressure-taking pipes 5; all the pressure-taking pipes 5 are respectively installed on the furnace wall of the blast furnace, and the end of the pressure-taking pipe 5 extends into the blast furnace hearth, and the front end of the pressure-taking pipe 5 is outside the furnace wall of the blast furnace; the characteristics are as follows: the pressure-measuring and back-blowing pipe 5-1 provided on each pressure-taking pipe 5 is successively connected to an external nitrogen device through a pressure transmitter 4 and a control valve 6, each pressure-taking pipe 5 is correspondingly installed with an electric screw dredging device 8, and the drill rod 8-2 of the electric screw dredging device 8 equipped with a drill bit 8-1 can reciprocate in the corresponding pressure-taking pipe 5; the motor of each electric screw dredging device 8 is successively connected to a motor controller 7 and an acquisition module 3, and all the acquisition modules 3 and control valves 6 are connected to the computer 1 through the PLC 2.

[0032] The computer 1 controls the parameters of the automatic dredging program, including the cleaning cycle and the number of cleaning cycles, and controls the electric screw dredging device 8 to achieve automatic cleaning. At the same time, the computer judges the cleaning difficulty and cleaning effect of the pipeline blockage by collecting the output current and the number of rotation turns of the motor of the electric screw dredging device through the acquisition module 3. While the electric screw dredging device is working, the computer 1 controls the high-pressure nitrogen of the external nitrogen device to blow through the control valve 6.

[0033] As Figure 2 shown, the electric screw dredging device involved in the present utility model includes a drill bit 8-1, a drill pipe 8-2, a connecting member 8-3, a sealing piston 8-4, a screw 8-5, a coupling 8-6, a motor 8-7, a support rod assembly 8-8, a slip ring 8-9, a connecting flange 8-10, a dust-proof bellows 8-11, and a nut 8-12; the drill bit 8-1 is installed at the head of the drill pipe 8-2, and the drill bit 8-1 can be disassembled and assembled from the drill pipe 8-2 for convenient replacement; the drill pipe 8-2 is connected to the connecting member 8-3, and the drill pipe 8-2 can be disassembled and assembled from the connecting member 8-3 for convenient replacement; the connecting member 8-3 is connected to the sealing piston 8-4, the sealing piston 8-4 is connected to the screw 8-5 through the nut 8-12, the sealing piston 8-4 is placed in the pressure-taking pipe 5, and the screw 8-5 is connected to the motor 8-7 through the coupling 8-6; the motor 8-7 is installed on four slip rings 8-9, the connecting flange 8-10 and the four slip rings 8-9 are respectively installed on the support rod assembly 8-8 composed of four support rods, and the four slip rings 8-9 can slide on the support rod assembly 8-8. Through the four slip rings 8-9, the motor 8-7 can slide along the support rod assembly 8-8. The four support rods of the support rod assembly 8-8 are respectively connected to the connecting flange 8-10 and the support rod connecting member 8-13 to form an integral body; between the motor 8-7 and the connecting flange 8-10, a dust-proof bellows 8-11 is installed; the nut 8-12 is installed on the connecting flange 8-10, and the dust-proof bellows 8-11 prevents dust from depositing on the screw 8-5, resulting in jamming when the screw 8-5 and the nut 8-12 interact.

[0034] The core point of the electric screw dredging device 8 is that the motor directly drives the screw 8-5 to rotate. Through the interaction between the screw 8-5 and the nut 8-12, the screw 8-5 is simultaneously pushed to move back and forth; thereby realizing that the drill bit 8-1 installed at the head of the drill pipe 8-2 moves back and forth while rotating, thus giving full play to the dual functions of the drill bit 8-1 for rotary crushing and forward pushing. The nut here can be a thread nut, a ball nut, a roller nut, etc., or other mechanical components that can achieve the same function.

[0035] When it is necessary to clean the pressure-taking pipe 5, the motor 8-7 rotates forward, driving the screw 8-5 to rotate forward. The screw 8-5 drives the drill pipe 8-2 to rotate forward through the piston 8-4 and the connecting piece 8-3. At the same time, the screw 8-5 and the nut 8-12 interact with each other, pushing the screw 8-5 to move forward, thereby pushing the drill pipe 8-2 to move forward. At this time, while the drill bit 8-1 rotates, it moves forward, playing a dual role of rotating and crushing and pushing forward the sediment in the pressure-taking pipe 5. At the same time, through the pressure-measuring and back-blowing pipe 5-1, high-pressure nitrogen is introduced to further blow away the crushed sediment.

[0036] When the drill bit 8-1 moves forward to the predetermined position of the pressure-taking pipe 5, the motor 8-7 starts to rotate in reverse, driving the drill pipe 8-2 to move back through the screw 8-5. After reaching the starting position, the motor 8-7 stops, and the high-pressure nitrogen introduced into the pressure-measuring and back-blowing pipe 5-1 also stops purging, and a cleaning cycle is completed. When waiting for the next cleaning cycle, repeat the above cleaning actions.

[0037] An automatic dredging method using the above-mentioned static pressure pressure-taking pipe dredging system for the blast furnace hearth is characterized by the following steps:

[0038] Step 1: Set the parameters of the automatic dredging program through a computer. The parameters include the cleaning cycle and the number of cleaning cycles. The cleaning cycle refers to the interval time between two cleanings. The number of cleaning cycles is the number of times the electric screw dredging device moves forward to clean the pressure-taking pipe during one cleaning cycle.

[0039] Step 2: When the set cleaning cycle arrives, the computer controls to turn on the motor of the electric screw dredging device, making the motor rotate forward, driving the screw to rotate forward. The screw drives the drill pipe to rotate forward through the piston and the connecting piece. At the same time, the screw and the nut interact with each other, pushing the screw forward, thereby pushing the drill pipe forward. At this time, while the drill bit rotates, it moves forward, playing a dual role of rotating and crushing and pushing forward the sediment in the pressure-taking pipe. At the same time, through the pressure-measuring and back-blowing pipe, nitrogen is introduced to further blow away the crushed sediment. When the drill bit moves forward to the predetermined position of the pressure-taking pipe, the motor starts to rotate in reverse, driving the drill pipe to move back through the screw. After reaching the starting position, the motor stops. That is, one cleaning cycle is completed. If there are multiple set cleaning cycles, the cleaning cycle is carried out again according to the setting until the set number of cleaning cycles is completed.

[0040] During the cleaning cycle in Step 2 above, when the computer controls to turn on the electric screw dredging device, the computer collects the operating parameters of the electric screw dredging device through the acquisition module to automatically correct the parameters of the dredging program and evaluate the cleaning effect. The specific steps are as follows:

[0041] Step A: When the static pressure system of the blast furnace shaft is just installed, or when there is no blockage in the pressure tapping pipe, the electric screw dredging device performs a cleaning of the pressure tapping pipe once, and the computer automatically records the output current and the number of rotation turns of the electric screw dredging device in this state as the initial operating parameters of the pressure tapping pipe; the output current is related to the output torque of the electric screw dredging device. The greater the output current, the greater the output torque, indicating that the blockage is more difficult to break; the number of rotation turns is related to the forward position of the drill bit. When the drill bit reaches the outlet of the pressure tapping pipe, the number of rotation turns of the motor represents the normal position that the drill bit can reach forward, that is, the position that the drill bit can reach when the pressure tapping pipe is not blocked;

[0042] Step B: Set the parameters of the initial cleaning cycle and the number of cleaning cycles of the dredging program in advance on the computer; the cleaning cycle is 1 - 24 hours, and the number of cleaning cycles is 1 - 5 times. The specific values depend on the operating conditions of the on-site blast furnace;

[0043] Step C: During the operation of the dredging program, monitor the output current and the number of rotation turns of the electric screw dredging device in real time to adjust the parameters of the dredging program in real time and judge the cleaning effect.

[0044] During the operation of the dredging program in Step C, monitor the output current of the electric screw dredging device in real time, judge the blockage situation of the pressure tapping pipe, and appropriately adjust the parameters of the dredging program. There are the following specific situations:

[0045] 1. If the output current is 120% - 150% of the initial output current of the pressure tapping pipe, it indicates that blockage accumulates in the pressure tapping pipe. After completing the current cleaning cycle, adjust the parameters of the dredging program: reduce the cleaning cycle of the dredging program by 30% to increase the cleaning frequency;

[0046] 2. If the output current is greater than 150% of the initial output current of the pressure tapping pipe, it indicates that the accumulation of blockage in the pressure tapping pipe begins to become serious. Then immediately perform another cleaning cycle and continuously monitor the output current until the output current is less than 150% of the initial output current during the cleaning cycle, then stop the cleaning cycle; after completing the current cleaning cycle, adjust the parameters of the dredging program: reduce the cleaning cycle of the dredging program by 50% and increase the number of cleaning cycles by 1 time to increase the cleaning intensity;

[0047] III. If the output current continuously exceeds 150% of the initial output current of the pressure extraction pipe, and the number of rotation cycles of the motor during forward rotation is less than the initial position value of the pressure extraction pipe, it indicates that the drill bit is stuck. In this case, stop the motor, immediately reverse and retreat, and perform a cleaning cycle again. After continuously cleaning 5 times, if the number of rotation cycles of the motor is equal to the initial position value of the pressure extraction pipe, the current cleaning cycle is completed, and the dredging program parameters are adjusted: reduce the cleaning cycle of the dredging program by 50% and increase the number of cleaning cycles by 2 times to further enhance the cleaning intensity. After continuously cleaning 5 times, if the number of rotation cycles of the motor is still less than the initial position value of the pressure extraction pipe and the drill bit is still stuck, an alarm is output to indicate that manual intervention is required.

[0048] During the operation of the dredging program in step C, the number of rotation cycles of the motor of the electric screw dredging device is monitored in real time to determine whether the drill bit can extend forward to the normal position, thereby evaluating the cleaning effect. There are the following specific situations:

[0049] I. If the monitoring shows that the drill bit extends forward to the normal position, it indicates that the current cleaning has achieved the expected effect.

[0050] II. If the monitoring finds that the drill bit does not extend forward to the normal position, it indicates that the current cleaning has not achieved the expected effect. At this time, there will also be a situation where the motor current continuously exceeds 150% of the initial output current of the pressure extraction pipe, indicating that the drill bit is stuck. Then the motor immediately reverses and repeats a cleaning action. After continuously cleaning 5 times, if the number of rotation cycles of the motor is equal to the initial position value of the pressure extraction pipe, it indicates that the current cleaning has achieved the expected effect. After continuously cleaning 5 times, if the number of rotation cycles of the motor is still less than the initial position value of the pressure extraction pipe, it indicates that the current cleaning has not achieved the expected effect and the drill bit is still stuck. Then an alarm is output to indicate that manual intervention is required.

[0051] The above example is one of the possible solutions and does not represent any other technical solutions developed using this core point, which are not within the protection scope of this utility model.

Claims

1. A blast furnace shaft static pressure tapping pipe dredging system, comprising a computer, a PLC, a plurality of acquisition modules, a plurality of pressure transmitters, a plurality of control valves, a plurality of motor controllers, a plurality of electric screw dredging devices, and a plurality of tapping pipes; all the tapping pipes are respectively installed on the furnace wall of the blast furnace, and the end of the tapping pipe extends into the blast furnace hearth, and the front end of the tapping pipe is outside the furnace wall of the blast furnace; characterized in that: Each pressure-taking pipe is provided with a pressure-measuring backflush pipe, which is successively connected to an external nitrogen device through a pressure transmitter and a control valve. An electric screw dredging device is correspondingly installed for each pressure-taking pipe, and the drill rod with a drill bit of the electric screw dredging device can reciprocate in the corresponding pressure-taking pipe. The motor of each electric screw dredging device is successively connected to a motor controller and a collection module, and all the collection modules and control valves are connected to a computer through a PLC.

2. The blast furnace shaft static pressure tapping pipe dredging system according to claim 1, wherein: The electric screw dredging device includes a drill bit, a drill rod, a connecting piece, a sealing piston, a screw, a coupling, a motor, a support rod assembly, a slip ring, a connecting flange, and a nut. The drill bit is installed at the head of the drill rod. The drill rod is connected to the connecting piece, the connecting piece is connected to the sealing piston, the sealing piston is connected to the screw through the nut, the sealing piston is placed in the pressure-taking pipe, and the screw is connected to the motor through the coupling. The motor is installed on four slip rings. The connecting flange and the four slip rings are respectively installed on a support rod assembly composed of four support rods, and the four slip rings can slide on the support rod assembly. The nut is installed on the connecting flange.

3. The blast furnace shaft static pressure tapping pipe dredging system according to claim 2, characterized in that: The four support rods of the support rod assembly are respectively connected to the connecting flange and the support rod connecting piece to form an integral body.

4. The blast furnace shaft static pressure tapping pipe dredging system according to claim 2, characterized in that: The electric screw dredging device further includes a dust-proof bellows, which is installed between the motor and the connecting flange.

5. The blast furnace shaft static pressure tapping pipe dredging system according to claim 2, wherein: The nut is a thread nut, a ball nut or a roller nut.

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