An automatic switching control device and method for a blast furnace stock flow valve group

Abstract

The present invention discloses an automatic switching control device for a blast furnace material flow valve group, which includes a circulation system and a hydraulic automatic switching control system. The circulation system includes a storage and conveying module, a power drive module connected to the storage and conveying module, and an oil filtration module connected to the storage and conveying module; the hydraulic automatic switching control system includes a valve platform connected to the circulation system, a material flow valve arranged above the circulation system and the valve platform, a plurality of proportional valve group modules arranged on the valve platform and connected to the storage and conveying module, and a solenoid valve module arranged on the valve platform and connected to the storage and conveying module; the present invention also discloses an automatic switching control method for a blast furnace material flow valve group, which includes constructing a hydraulic valve platform for automatic switching control of the blast furnace material flow valve group and formulating a valve group control strategy. The present invention can accurately and timely complete the conversion of the operation standby valve group, ensure the operation stability of the charging equipment, accurately control the material flow rate, reduce equipment losses and increase economic benefits.

Description

Technical Field

[0001] The present invention belongs to the field of blast furnace smelting, and particularly relates to a device and method for regulating and controlling the material flow during charging at the top of a blast furnace. Background Art

[0002] When charging at the top of a blast furnace, there are high requirements for the operating stability of the charging equipment and the control accuracy of the material flow rate. When a failure occurs in the hydraulic control system of the material flow valve, it affects the control of the opening and closing angle of the material flow valve, resulting in uneven burden distribution in the furnace. Although some ironmaking plants are equipped with a standby valve group for the hydraulic control of the material flow valve, in production practice, there are the following deficiencies in this technology:

[0003] 1. The conversion of the standby emergency solenoid valve group by on-site cabinet operation or remote operation takes a long time, affecting the normal production of the blast furnace, and even causing problems such as material shortage in the furnace, unstable gas flow, and furnace shutdown;

[0004] 2. Emergency manual operation is prone to misoperation. Controlling the opening of the material flow valve based on personal experience is not convenient, and the control of the material flow rate is inaccurate. Summary of the Invention

[0005] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title. However, such simplifications or omissions shall not be used to limit the scope of the present invention.

[0006] In view of the problems of long operation valve group conversion time and insufficient manual operation experience in the above-mentioned existing technology, the present invention is proposed.

[0007] To solve the above technical problems, the present invention provides the following technical solution: An automatic switching control device for a blast furnace material flow valve group, which includes a circulation system, including a storage and transportation module, a power drive module connected to the storage and transportation module, and an oil filtration module connected to the storage and transportation module; a hydraulic automatic switching control system, including a valve platform connected to the circulation system, a material flow valve arranged above the circulation system and the valve platform, a plurality of proportional valve group modules arranged on the valve platform and connected to the storage and transportation module, and a solenoid valve module arranged on the valve platform and connected to the storage and transportation module; at least two sets of proportional valve groups are provided in the hydraulic automatic switching control system.

[0008] As a preferred embodiment of the automatic switching control device for the blast furnace material flow valve group of the present invention, the following components are included: The storage and transportation module includes an oil tank, an inlet and outlet oil pipe connected to the oil tank, and a material flow valve oil cylinder connected to the inlet and outlet oil pipe; The power drive module includes a circulating oil pump disposed near the oil tank and connected to the inlet and outlet oil pipe, and a main oil pump of the oil station disposed near the circulating oil pump and connected to the inlet and outlet oil pipe; The oil filtration module includes an oil station circulating filter disposed near the oil tank and connected to the inlet and outlet oil pipe, and an inlet oil filter disposed on the valve platform and connected to the inlet and outlet oil pipe.

[0009] As a preferred embodiment of the automatic switching control device for the blast furnace material flow valve group of the present invention, the proportional valve group module includes a first proportional valve group connected to the inlet and outlet oil pipe, a second proportional valve group disposed on the valve platform and in parallel with the first proportional valve group, an Nth proportional valve group disposed on the valve platform and in parallel with the first proportional valve group and the second proportional valve group respectively, and a material flow encoder connected to one side of the material flow valve.

[0010] As a preferred embodiment of the automatic switching control device for the blast furnace material flow valve group of the present invention, the solenoid valve module includes a solenoid valve in parallel with the proportional valve group module, and a proximity switch connected to one side of the material flow valve.

[0011] As a preferred embodiment of the automatic switching control device for the blast furnace material flow valve group of the present invention, the first proportional valve group includes a first differential pressure transmitter connected to the inlet and outlet oil pipe, a first pilot valve connected to the first differential pressure transmitter, and a first proportional valve connected to the first pilot valve; The second proportional valve group includes a second differential pressure transmitter connected to the first proportional valve group, a second pilot valve connected to the second differential pressure transmitter, and a second proportional valve connected to the second pilot valve; The Nth proportional valve group includes an Nth differential pressure transmitter connected to the second proportional valve group, an Nth pilot valve connected to the Nth differential pressure transmitter, and an Nth proportional valve connected to the Nth pilot valve.

[0012] The beneficial effects of the automatic switching control device for the blast furnace material flow valve group of the present invention are as follows: The automatic switching control device for the blast furnace material flow valve group of the present invention consists of two operating systems, namely a circulating system that plays a role in protection, filtration, storage, and transportation, and a hydraulic automatic switching control system that plays a role in automatic switching control of hydraulic pressure; Specifically, first, the oil filtration module in the circulating system has the function of protecting the oil pump from inhaling large mechanical impurities, and then the storage and transportation module in the circulating system has the function of transporting a certain amount of oil to a predetermined position and temporarily storing a certain amount of oil. Among them, the power drive module in the circulating system provides hydraulic power to the required equipment, thereby driving each actuator on the equipment to complete the actions required by the equipment. Finally, the multiple proportional valve group modules and solenoid valve modules in the hydraulic automatic switching control system have the function of automatically switching and controlling hydraulic pressure under normal and abnormal conditions respectively.

[0013] In view of the problems of long conversion time of the operation valve group and insufficient manual operation experience in the above-mentioned existing technologies, in order to realize the automatic conversion of the valve group more accurately, error-free and in a timely manner, an automatic switching control method for the blast furnace material flow valve group is proposed.

[0014] To solve the above technical problems, the present invention also provides the following technical solutions: including the automatic switching control method for the blast furnace material flow valve group described in any one of the claims; and, including, constructing a hydraulic valve platform for automatic switching control of the blast furnace material flow valve group; formulating a valve group control strategy.

[0015] As a preferred solution of the automatic switching control method for the blast furnace material flow valve group of the present invention, wherein: constructing a hydraulic valve platform for automatic switching control of the blast furnace material flow valve group includes setting multiple groups of proportional valve group modules and a group of solenoid valves on the valve platform; setting corresponding differential pressure transmitters, pilot valves and proportional valves on the multiple groups of proportional valve group modules; setting proportional valve group automatic control mode and solenoid valve control mode.

[0016] As a preferred solution of the automatic switching control method for the blast furnace material flow valve group of the present invention, wherein: formulating a valve group control strategy includes setting the proportional valve group automatic control mode under normal conditions of the hydraulic automatic switching control system; setting the brake platform control mode under abnormal conditions of the hydraulic automatic switching control system.

[0017] As a preferred solution of the automatic switching control method for the blast furnace material flow valve group of the present invention, wherein: the proportional valve group automatic control mode under normal conditions of the hydraulic automatic switching control system includes setting material flow parameter values: setting the material flow angle as N, the actually measured material flow angle by the material flow encoder as N1, and setting the pressure difference as K; enabling the first proportional valve group during the adjustment of the material flow valve opening: first opening the first pilot valve, then outputting an analog quantity a to the first proportional valve, the hydraulic oil reaches the material flow valve cylinder through the oil circuit, the first differential pressure transmitter detects the pressure difference n, N1 = N, n < K.

[0018] As a preferred solution of the automatic switching control method for the blast furnace material flow valve group of the present invention, wherein: the brake platform control mode under abnormal conditions of the hydraulic automatic switching control system includes determining the source of the abnormal situation; the second proportional valve group control mode or the Nth proportional valve group control mode; the solenoid valve control mode; determining the source of the abnormal situation includes that the first differential pressure transmitter detects that the pressure difference n1 is greater than the set value K, and the detected value N1 by the material flow encoder is not equal to N, at this time it is determined that there is an abnormality in the first proportional valve group; the second differential pressure transmitter detects that the pressure difference n2 is greater than the set value K, and the detected value N1 by the material flow encoder is not equal to N, at this time it is determined that there is an abnormality in the second proportional valve group; the Nth differential pressure transmitter detects that the pressure difference n2 is greater than the set value K, and the detected value N1 by the material flow encoder is not equal to N, at this time it is determined that there is an abnormality in the Nth proportional valve group; the second proportional valve group control mode or the Nth proportional valve group control mode

[0019] The formula includes that when the first proportional valve group or the second proportional valve group is enabled during the opening adjustment of the material flow valve, if the differential pressure detected by the material flow encoder is greater than the set value K and an alarm warning pops up on the screen, the proportional valve group switching button on the screen can be immediately clicked to control the second proportional valve group or the Nth proportional valve group, or wait for M seconds under unattended monitoring for the program to automatically switch to control the second proportional valve group or the Nth proportional valve group; the solenoid valve control method includes that when there is an abnormality in the oil circuit of multiple proportional valve group modules, the valve group switching button on the screen can be immediately clicked to control the solenoid valve, or wait for M1 seconds under unattended monitoring for the program to automatically switch to control the solenoid valve.

[0020] The beneficial effects of the automatic switching control method for the blast furnace material flow valve group of the present invention are as follows: When a failure occurs in the hydraulic control system of the material flow valve, the present invention can accurately and timely realize the switching control of the standby valve group, reduce the failure handling time and the slow wind time of the equipment, and increase economic benefits. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0022] Figure 1 It is a layout diagram of the top charging equipment of the blast furnace.

[0023] Figure 2 It is a schematic diagram of the oil circuit flow of the blast furnace top material flow valve.

[0024] Figure 3 It is a hydraulic schematic diagram of the automatic switching control device for the blast furnace material flow valve group. Specific Embodiments

[0025] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the drawings of the specification.

[0026] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0027] Second, the "one embodiment" or "embodiment" referred to herein means a specific feature, structure, or characteristic that may be included in at least one implementation manner of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or selectively exclusive embodiments from other embodiments.

[0028] Embodiment 1

[0029] Referring to Figures 1 to 3 , it is the first embodiment of the present invention. This embodiment provides an automatic switching control device for a blast furnace material flow valve group, which can complete the conversion of the operation standby valve group within a short time through two sets of operating systems, ensuring the operation stability of the charging equipment and accurately controlling the material flow rate.

[0030] Specifically, the circulation system 100 includes a storage and transportation module 101, a power drive module 102 connected to the storage and transportation module 101, and an oil filtration module 103 connected to the storage and transportation module 101; the hydraulic automatic switching control system 200 includes a valve platform 201 connected to the circulation system 100, a material flow valve 202 arranged above the circulation system 100 and the valve platform 201, multiple proportional valve group modules 203 arranged on the valve platform 201 and connected to the storage and transportation module 101, and a solenoid valve module 204 arranged on the valve platform 201 and connected to the storage and transportation module 101; the hydraulic automatic switching control system 200 is provided with at least two sets of proportional valve groups 202.

[0031] The setting of the circulation system 100 serves a protective filtration and storage transportation function, and the setting of the hydraulic automatic switching control system 200 serves an automatic switching control hydraulic function; specifically, first, the oil filtration module 103 in the circulation system 100 has the function of protecting the oil pump from inhaling large mechanical impurities, and then the storage and transportation module 101 in the circulation system 100 has the function of transporting a certain amount of oil to a predetermined position and temporarily storing a certain amount of oil. Among them, the power drive module 102 in the circulation system 100 provides hydraulic power to the required equipment, so as to drive each actuator on the equipment to complete the actions required by the equipment. Finally, the multiple proportional valve group modules 203 and the solenoid valve module 204 in the hydraulic automatic switching control system 200 have the function of automatically switching and controlling the hydraulic pressure under normal and abnormal conditions respectively.

[0032] In use, first, the power drive module 102 in the circulation system 100 is driven by an external power source. Then, the power generated by the power drive module 102 is used to further drive the oil filtration module 103 to perform double impurity filtration on the hydraulic oil, and then the oil is transported to a predetermined position through the storage and transportation module 101. After that, the multi-group proportional valve module 203 and the solenoid valve module 204 in the hydraulic automatic switching control system 200 are used to complete the control of the hydraulic pressure under normal and abnormal conditions respectively.

[0033] It should be noted that in the blast furnace smelting process, there is a complete blast furnace top charging combined system (M). The blast furnace top charging combined system M includes a working system and a charging device.

[0034] The working system includes the circulation system 100 and the hydraulic automatic switching control system 200. The charging device includes a storage hopper 300, a valve box 400 connected to the bottom of the storage hopper 300, a manual knife gate valve 500 connected to the bottom of the valve box 400, a gearbox 600 connected to the manual knife gate valve 500, a burden distributing chute 700 arranged below the gearbox 600, and a blast furnace 800 arranged below the burden distributing chute 700.

[0035] The charging device is the main device in the entire blast furnace smelting technical process. According to the process production requirements, the raw fuel is fed by a feeder vibrating feeder, sized by a vibrating screen, weighed by a weighing hopper to obtain the batch weight of the required raw fuel, and then transported into the top receiving hopper through a charging belt conveyor. After the storage hopper 300 is emptied and the lower tight valve and the material flow valve 202 in the valve box 400 are closed, the relief valve in the valve box 400 is opened to relieve pressure, so that the pressure in the storage hopper 300 is balanced with the atmospheric pressure (the relief valve in the valve box 400 is closed). Then, the baffle valve and the upper tight valve in the valve box 400 are opened to put the raw fuel into the storage hopper 300. After the receiving hopper finishes discharging (the baffle valve and the upper tight valve in the valve box 400 are closed), the sounding rod descends to the set material line, the sounding rod is lifted, the equalizing valve in the valve box 400 is opened to increase the pressure, so that the pressure in the storage hopper is balanced with the pressure in the furnace (the equalizing valve in the valve box 400 is closed), and the lower tight valve and the material flow valve 202 in the valve box 400 are opened. The raw fuel is distributed through the burden distributing chute 700 according to the charging system, and all the raw fuel enters the blast furnace 800. The lower tight valve and the material flow valve are closed, the sounding rod is lowered, and the blast furnace burden demand is continuously met. Among them, the manual knife gate valve 500 and the gearbox 600 in the charging device play an auxiliary driving role.

[0036] The charging device is arranged in parallel on one side of the working system. The material flow valve 202 is used to set the angle of the distributing chute 700 and the number of revolutions at different angles, as well as the material flow angle at different numbers of revolutions, with controllable flow rate, in case of uneven burden surface or local caving in the blast furnace 800, so as to achieve uniform distribution of the burden on the burden surface in the furnace. The working system controls the operation of the material flow valve 202 by automatically switching and controlling multiple groups of proportional valve block modules 203 and solenoid valve modules 204.

[0037] In summary, through the settings of the two operating systems of the circulation system 100 and the hydraulic automatic switching control system 200, the conversion of the operating standby valve group can be completed in a short time, ensuring the operation stability of the charging equipment and accurately controlling the material flow rate.

[0038] Embodiment 2

[0039] Refer to Figures 1 to 3 , which is the second embodiment of the present invention. Based on the previous embodiment, a blast furnace material flow valve group automatic switching control device is provided, which can complete the conversion of the operating standby valve group in a short time through two operating systems, ensuring the operation stability of the charging equipment and accurately controlling the material flow rate; namely, the circulation system that plays a role in protecting, filtering, storing and transporting, and the hydraulic automatic switching control system that plays a role in automatically switching and controlling the hydraulic pressure.

[0040] Specifically, the circulation system 100 includes a storage and transportation module 101, a power drive module 102 connected to the storage and transportation module 101, and an oil filtration module 103 connected to the storage and transportation module 101; the hydraulic automatic switching control system 200 includes a valve platform 201 connected to the circulation system 100, a material flow valve 202 arranged above the circulation system 100 and the valve platform 201, multiple groups of proportional valve block modules 203 arranged on the valve platform 201 and connected to the storage and transportation module 101, and a solenoid valve module 204 arranged on the valve platform 201 and connected to the storage and transportation module 101; the hydraulic automatic switching control system 200 is provided with at least two groups of proportional valve groups 202.

[0041] Furthermore, the storage and transportation module 101 includes an oil tank 101a, an inlet and outlet oil pipe 101b connected to the oil tank 101a, and a material flow valve oil cylinder 101c connected to the inlet and outlet oil pipe 101b; the power drive module 102 includes a circulation oil pump 102a arranged near the oil tank 101a and connected to the inlet and outlet oil pipe 101b, and an oil station main oil pump 102b arranged near the circulation oil pump 102a and connected to the inlet and outlet oil pipe 101b; the oil filtration module 103 includes an oil station circulation filter 103a arranged near the oil tank 101a and connected to the inlet and outlet oil pipe 101b, and an inlet oil filter 103b arranged on the valve platform 201 and connected to the inlet and outlet oil pipe 101b.

[0042] It should be noted that the fuel tank 101a and the material flow valve oil cylinder 101c in the storage and transportation module 101 have the function of temporarily storing oil, and the hydraulic oil is circulated and transported to the designated equipment through the inlet and outlet oil pipes 101b; the circulating oil pump 102a in the power drive module 102 is used as the driving force of the circulation system to ensure the reuse of the hydraulic oil, while the main oil pump 102b in the power drive module 102 continuously ensures the transportation of the hydraulic oil during the normal operation of the equipment; the oil station circulation filter 103a and the inlet oil filter 103b in the oil filtration module 103 both protect the oil pump from inhaling larger mechanical impurities to avoid damage to the refined equipment.

[0043] Furthermore, the proportional valve group module 203 includes a first proportional valve group 203a connected to the inlet and outlet oil pipes 101b, a second proportional valve group 203b arranged on the valve platform 201 and in parallel with the first proportional valve group 203a, an Nth proportional valve group 203c arranged on the valve platform 201 and in parallel with the first proportional valve group 203a and the second proportional valve group 203b respectively, and a material flow encoder 203d connected to one side of the material flow valve 202.

[0044] It should be noted that the material flow encoder 203d is externally connected to the material flow valve 202 and is used to detect the material flow angle and feedback the current state of the material flow valve 202; the proportional valve group module 203 receives the signal from the material flow encoder 203d to adjust the size of the proportional valve oil circuit and control the amount of oil flowing to the material flow valve oil cylinder 101c to achieve the opening degree of the material flow valve 202.

[0045] Furthermore, the solenoid valve module 204 includes a solenoid valve 204a in parallel with the proportional valve group module 203, and a proximity switch 204b connected to one side of the material flow valve 202.

[0046] It should be noted that the solenoid valve 204a can only control two action states of the material flow valve - fully open and fully closed, and the material flow velocity cannot be controlled, so uniform cloth feeding cannot be achieved; the proximity switch 204b signals when it reaches the open position and the closed position, and finally the solenoid valve is disconnected through signal feedback interlock.

[0047] Furthermore, the first proportional valve group 203a includes a first differential pressure transmitter 203a-1 connected to the inlet and outlet oil pipes 101b, a first pilot valve 203a-2 connected to the first differential pressure transmitter 203a-1, and a first proportional valve 203a-3 connected to the first pilot valve 203a-2;

[0048] The second proportional valve group 203b includes a second differential pressure transmitter 203b-1 connected to the first proportional valve group 203a, a second pilot valve 203b-2 connected to the second differential pressure transmitter 203b-1, and a second proportional valve 203b-3 connected to the second pilot valve 203b-2;

[0049] The Nth proportional valve group 203c includes an Nth differential pressure transmitter 203c-1 connected to the second proportional valve group 203b, an Nth pilot valve 203c-2 connected to the Nth differential pressure transmitter 203c-1, and an Nth proportional valve 203c-3 connected to the Nth pilot valve 203c-2.

[0050] During use, first drive the circulating oil pump 102a and the main oil pump 102b of the oil station through an external power source, and then, through the power generated by driving the circulating oil pump 102a and the main oil pump 102b of the oil station, further drive the hydraulic oil in the fuel tank 101a to flow through the inlet and outlet pipes 101b. After double impurity filtration by the oil station circulating filter 103a and the inlet filter 103b, it finally reaches the material flow valve cylinder 101c; afterwards, detect the material flow angle through the material flow encoder 203d externally connected to the material flow valve 202, feedback the state of the material flow valve 202 at this time and transmit a signal to the proportional valve group module 203. Finally, the proportional valve group module 203 adjusts the size of the proportional valve oil circuit to control the amount of oil reaching the material flow valve cylinder 101c, so as to achieve the opening degree of the material flow valve 202.

[0051] In summary, through the settings of the two operating systems of the circulation system 100 and the hydraulic automatic switching control system 200, the conversion of the standby valve group can be completed in a short time, ensuring the operating stability of the charging equipment and accurately controlling the material flow rate; among them, the filtering functions of the oil station circulating filter 103a and the inlet filter 103b are the premise and foundation for protecting the equipment and ensuring the normal operation of the hydraulic automatic switching control system, and the detection function and signal transmission function of the material flow encoder 203d are the key points of the hydraulic automatic switching control system.

[0052] Embodiment 3

[0053] Refer to Figure 2 and Figure 3 , which is the third embodiment of the present invention. Different from the second embodiment, this embodiment provides a method for automatically switching and controlling a blast furnace material flow valve group.

[0054] Specifically, a method for automatically switching and controlling a blast furnace material flow valve group includes constructing a hydraulic valve platform for automatically switching and controlling the blast furnace material flow valve group and formulating a valve group control strategy. When a failure occurs in the material flow valve hydraulic control system, it can accurately and timely realize the switching control of the standby valve group, reduce the fault handling time and the equipment slow wind time, and increase economic benefits.

[0055] Further, the construction of the automatic switching control hydraulic valve platform for the blast furnace material flow valve group includes arranging multiple proportional valve group modules 203 and a set of solenoid valves 303 on the valve platform 201; arranging corresponding differential pressure transmitters, pilot valves and proportional valves on the multiple proportional valve group modules 203; and setting the proportional valve group automatic control mode and the solenoid valve control mode.

[0056] Further, formulating the valve group control strategy includes setting the proportional valve group automatic control mode under normal conditions of the hydraulic automatic switching control system 200; and setting the brake platform control mode under abnormal conditions of the hydraulic automatic switching control system 200.

[0057] Further, the proportional valve group automatic control mode under normal conditions of the hydraulic automatic switching control system 200 includes setting the material flow parameter values: setting the material flow angle as N, the actually measured material flow angle by the material flow encoder 203d as N1, and setting the pressure difference as K;

[0058] When enabling the first proportional valve group 203a during the opening adjustment of the material flow valve 202:

[0059] First open the first pilot valve 203a-2, then output the analog quantity a 4-20 mA to the first proportional valve 203a-3. The hydraulic oil reaches the material flow valve oil cylinder 101c through the oil circuit. The first differential pressure transmitter 203a-1 detects the pressure difference n, N1 = N, n < K.

[0060] Further, the brake platform control mode under abnormal conditions of the hydraulic automatic switching control system 200 includes determining the source of the abnormal situation; the control mode of the second proportional valve group 203b or the control mode of the Nth proportional valve group 203c;

[0061] the control mode of the solenoid valve 204a;

[0062] Determining the source of the abnormal situation and starting the corresponding equipment for switching control includes,

[0063] When the first differential pressure transmitter 203a-1 detects that the pressure difference n1 is greater than the set value K, and the detected value N1 by the material flow encoder 203d is not equal to N and an alarm warning pops up on the screen, it is determined at this time that there is an abnormality in the first proportional valve group 203a;

[0064] At this time, the proportional valve group switching button on the screen can be immediately clicked to control the second proportional valve group 203b, or wait for M seconds under unattended monitoring for the program to automatically switch to the control of the second proportional valve group 203b;

[0065] When the second proportional valve group 203b is working, the system will further detect the oil circuit problem of the first proportional valve group 203a according to the working condition of the second proportional valve group 203b and make a comparison, and then conduct background independent analysis based on the obtained data to give an operation plan. At this time, since there are only two proportional valve groups, the entire data analysis process will be relatively simple and fast. After the system operates according to the plan set in the background, if the detection value N1 of the material flow encoder 203d is equal to N and a green mark pops up on the screen, it is determined at this time that the first proportional valve group 203a has returned to normal, and it will automatically switch back to the first proportional valve group 203a and automatically close the second proportional valve group 203b. If the detection value N1 of the material flow encoder 203d is not equal to N and an alarm warning pops up on the screen, it is determined at this time that the first proportional valve group 203a is still abnormal, and a secondary alarm will be activated to remind the staff that the first proportional valve group 203a has encountered a fatal error that cannot be returned, so as to take manual intervention to solve the problem in time and avoid further damage to the equipment due to the problem not being solved in time.

[0066] When the differential pressure n2 detected by the second differential pressure transmitter 203b-1 is greater than the set value K, and the detection value N1 of the material flow encoder 203d is not equal to N and an alarm warning pops up on the screen, it is determined at this time that the second proportional valve group 203b is abnormal;

[0067] At this time, you can immediately click the proportional valve group switching button on the screen to control the Nth proportional valve group 203c, or wait for M seconds under unattended monitoring for the program to automatically switch to control the Nth proportional valve group 203c;

[0068] When the Nth proportional valve group 203c is working, the system will further detect the oil circuit problems of the first proportional valve group 203a and the second proportional valve group 203b according to the working condition of the Nth proportional valve group 203c and make a comparison, and then conduct background independent analysis based on the obtained data to give an operation plan. At this time, since there are two or more than two proportional valve groups, the entire data analysis process will be relatively complex and long. Therefore, when the system switches to the Nth proportional valve group 203c to work, the protection mode for the first proportional valve group 203a and the second proportional valve group 203b will be turned on simultaneously until the first proportional valve group 203a and the second proportional valve group 203b return to the normal working mode or are manually intervened;

[0069] When the system operates according to the background-set scheme, if the two detection values N1 of the material flow encoder 203d are equal to N and a green indicator pops up on the screen, it is determined at this time that the first proportional valve group 203a and the second proportional valve group 203b return to normal, and it will automatically switch back to the first proportional valve group 203a and automatically close the Nth proportional valve group 203c; if the detection value N1 of the material flow encoder 203d for the first proportional valve group 203a is equal to N and a green indicator pops up on the screen, while the detection value N1 for the second proportional valve group 203b is not equal to N and an alarm warning pops up on the screen, it will automatically switch back to the first proportional valve group 203a and automatically close the Nth proportional valve group 203c, and at the same time start the corresponding voice prompt alarm to remind the staff that the second proportional valve group 203b has encountered a fatal error that cannot be returned, so as to take manual intervention to solve the problem;

[0070] If the detection value N1 of the material flow encoder 203d for the second proportional valve group 203a is equal to N and a green indicator pops up on the screen, while the detection value N1 for the first proportional valve group 203a is not equal to N and an alarm warning pops up on the screen, it will automatically switch back to the second proportional valve group 203b and automatically close the Nth proportional valve group 203c, and at the same time start the corresponding voice prompt alarm to remind the staff that the first proportional valve group 203a has encountered a fatal error that cannot be returned, so as to take manual intervention to solve the problem;

[0071] If the two detection values N1 of the material flow encoder 203d are not equal to N and an alarm warning pops up on the screen, it is determined at this time that the first proportional valve group 203a and the second proportional valve group 203b are still abnormal, and multiple alarms will be started to remind the staff that the first proportional valve group 203a and the second proportional valve group 203b have encountered a fatal error that cannot be returned, so as to take manual intervention to solve the problem.

[0072] The differential pressure n2 detected by the Nth differential pressure transmitter 203c-1 is greater than the set value K, the detection value N1 of the material flow encoder 203d is not equal to N and an alarm warning pops up on the screen, and it is determined at this time that the Nth proportional valve group 203c is abnormal; at this time, the valve group switching button on the screen can be immediately clicked to control the solenoid valve 204a, or wait for M1 seconds for the program to automatically switch the solenoid valve 204a control under unattended monitoring;

[0073] When the solenoid valve 204a is working, the system will further detect the oil circuit problems of multiple proportional valve group modules 203 according to the working conditions of the solenoid valve 204a and make comparisons. Since the oil circuits of multiple proportional valve group modules 203 have problems at the same time, the total inspection and protection modes of multiple proportional valve group modules 203 will be started simultaneously, and then the background will perform autonomous analysis based on the obtained data to give an operation plan. At this time, although there are problems with multiple proportional valve groups, due to the pre-set total inspection mode being turned on, the entire data analysis process is both detailed and fast until multiple proportional valve group modules 203 return to the normal working mode or are manually intervened;

[0074] When the system operates according to the scheme set in the background, if the detected value N1 of the material flow encoder 203d for a certain proportional valve group is equal to N and a green identifier pops up on the screen, while the detected value N1 for other proportional valve groups is not equal to N and an alarm warning pops up on the screen, at this time, it is determined that a certain proportional valve group has returned to normal, and it will automatically switch back to a certain proportional valve group and detect and feedback signals through the signal of the proximity switch 204b. Finally, the system automatically cuts off the power supply of the solenoid valve 204a; at the same time, the corresponding voice prompts the alarm successively to remind the staff that the corresponding proportional valve group has encountered a fatal error that cannot be returned, so as to take manual intervention to solve the problem;

[0075] If the detected values N1 of the material flow encoder 203d for several or all proportional valve groups are equal to N and a green identifier pops up on the screen, at this time, it is determined that several or all proportional valve groups have returned to normal, and it will automatically switch back to the first proportional valve group 203a or the proportional valve group with a higher label and detect and feedback signals through the signal of the proximity switch 204b. Finally, the system automatically cuts off the power supply of the solenoid valve 204a;

[0076] If all the detected values N1 of the material flow encoder 203 are not equal to N and an alarm warning pops up on the screen, at this time, it is determined that all the proportional valve groups are still abnormal, and the ultimate alarm will be started to remind the staff that all the proportional valve groups have encountered a fatal error that cannot be returned, and the system will automatically send an email with the corresponding content to the mailbox of the leaders at each level, so as to call a professional review team for further manual inspection and finally determine the handling opinion.

[0077] The economic benefits are specifically manifested as follows:

[0078] Calculated according to the molten iron cost of about 3000 yuan / tFe, a total of 7 batches of materials are fed less in one hour, and the output loss due to one hour of blast furnace shutdown is about 800t. The total economic loss is reduced by about: 3000 * 800 = 2.4 million yuan.

[0079] As shown in the figure:

[0080] Table 1 Comparison of economic benefit calculation before and after the transformation of the present invention

[0081]

[0082] To sum up, when a failure occurs in the hydraulic control system of the material flow valve, the present invention can accurately, timely and error-free realize the switching control of the standby valve group through the background system, enter the corresponding problem handling mode according to different levels of abnormal conditions and report to the corresponding staff in time, reduce the fault handling time and the slow blast time of the equipment, and finally reduce the equipment loss and increase the economic benefits.

[0083] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An automatic switching control device for a blast furnace material flow valve group, characterized in that: including, a circulation system (100), comprising a storage and conveyance module (101), a power drive module (102) connected to the storage and conveyance module (101), and an oil filtration module (103) connected to the storage and conveyance module (101); a hydraulic automatic switching control system (200), comprising a valve platform (201) connected to the circulation system (100), a material flow valve (202) disposed above the circulation system (100) and the valve platform (201), a plurality of proportional valve group modules (203) disposed on the valve platform (201) and connected to the storage and conveyance module (101), and a solenoid valve module (204) disposed on the valve platform (201) and connected to the storage and conveyance module (101); the hydraulic automatic switching control system (200) is provided with at least two proportional valve group modules (203); the storage and conveyance module (101) comprises an oil tank (101a), an inlet and outlet oil pipe (101b) connected to the oil tank (101a), and a material flow valve cylinder (101c) connected to the inlet and outlet oil pipe (101b); the oil filtration module (103) comprises an oil station circulation filter (103a) disposed near the oil tank (101a) and connected to the inlet and outlet oil pipe (101b), and an inlet oil filter (103b) disposed on the valve platform (201) and connected to the inlet and outlet oil pipe (101b); the proportional valve group module (203) comprises a first proportional valve group (203a) connected to the inlet and outlet oil pipe (101b), a second proportional valve group (203b) disposed on the valve platform (201) and in parallel with the first proportional valve group (203a), an Nth proportional valve group (203c) disposed on the valve platform (201) and in parallel with the first proportional valve group (203a) and the second proportional valve group (203b), respectively, and a material flow encoder (203d) connected to one side of the material flow valve (202); 2. The automatic switching control device for a blast furnace material flow valve group according to claim 1, characterized in that: the power drive module (102) comprises a circulation oil pump (102a) disposed near the oil tank (101a) and connected to the inlet and outlet oil pipe (101b), and an oil station main oil pump (102b) disposed near the circulation oil pump (102a) and connected to the inlet and outlet oil pipe (101b); 3. The automatic switching control device for the blast furnace stock flow valve group according to any one of claims 1 to 2, characterized in that: the solenoid valve module (204) comprises a solenoid valve (204a) in parallel with the proportional valve group module (203), and a proximity switch (204b) connected to one side of the material flow valve (202); 4. The automatic switching control device for the blast furnace burden flow valve group according to claim 3, characterized in that: the first proportional valve group (203a) comprises a first differential pressure transmitter (203a-1) connected to the inlet and outlet oil pipe (101b), a first pilot valve (203a-2) connected to the first differential pressure transmitter (203a-1), and a first proportional valve (203a-3) connected to the first pilot valve (203a-2); The second proportional valve group (203b) includes a second differential pressure transmitter (203b-1) connected to the first proportional valve group (203a), a second pilot valve (203b-2) connected to the second differential pressure transmitter (203b-1), and a second proportional valve (203b-3) connected to the second pilot valve (203b-2); The Nth proportional valve group (203c) includes an Nth differential pressure transmitter (203c-1) connected to the second proportional valve group (203b), an Nth pilot valve (203c-2) connected to the Nth differential pressure transmitter (203c-1), and an Nth proportional valve (203c-3) connected to the Nth pilot valve (203c-2).

5. An automatic switching control method for a blast furnace burden flow valve group, characterized in that: including the automatic switching control device for the blast furnace burden flow valve group described in claim 4; and, including, constructing an automatic switching control hydraulic valve platform for the blast furnace burden flow valve group; formulating a valve group control strategy.

6. The automatic switching control method of the blast furnace burden flow valve group according to claim 5, characterized in that: The construction of the automatic switching control hydraulic valve platform for the blast furnace burden flow valve group includes, setting multiple groups of the proportional valve group modules (203) and a group of the solenoid valves (204a) on the valve platform (201); setting differential pressure transmitters, pilot valves, and proportional valves corresponding in number on the multiple groups of proportional valve group modules (203); setting the proportional valve group automatic control mode and the solenoid valve control mode.

7. The automatic switching control method of the blast furnace burden flow valve group according to claim 5 or 6, characterized in that: The formulation of the valve group control strategy includes, setting the proportional valve group automatic control method under normal conditions of the hydraulic automatic switching control system (200); mode; setting the gate control method under abnormal conditions of the hydraulic automatic switching control system (200).

8. The automatic switching control method for the blast furnace stock flow valve group according to claim 7, characterized in that: The proportional valve group automatic control method under normal conditions of the hydraulic automatic switching control system (200) includes, setting the material flow parameter values: setting the material flow angle as N, the actually measured material flow angle by the material flow encoder (203d) as N1, and setting the differential pressure as K; difference as K; enabling the first proportional valve group (203a) during the opening adjustment of the burden flow valve (202): first opening the first pilot valve (203a-2), then outputting an analog quantity a to the first proportional valve (203a-3), the hydraulic oil reaching the burden flow valve oil cylinder (101c) through the oil circuit, and the first differential pressure transmitter (203a-1) detecting a differential pressure n, N1 = N, n < K.

9. The automatic switching control method of the blast furnace stock flow valve group according to claim 8, characterized in that: The gate control method under abnormal conditions of the hydraulic automatic switching control system (200) includes, determining the source of the abnormal situation; the control method of the second proportional valve group (203b) or the control method of the Nth proportional valve group (203c); mode; the control method of the solenoid valve (204a); The determination of the source of the abnormal situation includes, the differential pressure n1 detected by the first differential pressure transmitter (203a-1) being greater than the set value K, and the detected value N1 by the material flow encoder (203d) not being equal to N, at this time it is determined that there is an abnormality in the first proportional valve group (203a); the differential pressure n1 detected by the first differential pressure transmitter (203a-1) is greater than the set value K, and the detected value N1 by the material flow encoder (203d) is not equal to N, at this time it is determined that there is an abnormality in the first proportional valve group (203a); the differential pressure n2 detected by the second differential pressure transmitter (203b-1) being greater than the set value K, and the detected value N1 by the material flow encoder (203d) not being equal to N, at this time it is determined that there is an abnormality in the second proportional valve group (203b); the differential pressure n2 detected by the second differential pressure transmitter (203b-1) is greater than the set value K, and the detected value N1 by the material flow encoder (203d) is not equal to N, at this time it is determined that there is an abnormality in the second proportional valve group (203b); The differential pressure transmitter (203c-1) of No. N detects that the differential pressure n2 is greater than the set value K, and the detection value N1 of the material flow encoder (203d) is not equal to N. At this time, it is determined that there is an abnormality in the proportional valve group (203c) of No. N; The control mode of the second proportional valve group (203b) or the control mode of the proportional valve group (203c) of No. N includes, When the first proportional valve group (203a) or the second proportional valve group (203b) is enabled during the opening adjustment of the material flow valve (202), the material flow encoder (203d) detects that the differential pressure is greater than the set value K and an alarm warning pops up on the screen. At this time, the proportional valve group switching button on the screen can be immediately clicked to control the second proportional valve group (203b) or the proportional valve group (203c) of No. N, or wait for M seconds for the program to automatically switch the control of the second proportional valve group (203b) or the proportional valve group (203c) of No. N under unattended monitoring; The control mode of the solenoid valve (204a) includes, When there is an abnormality in the oil circuit of multiple groups of the proportional valve group modules (203), the solenoid valve (204a) control can be immediately clicked by the valve group switching button on the screen, or wait for M1 seconds for the program to automatically switch the solenoid valve (204a) control under unattended monitoring.

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