Blast furnace top feeding winch control system

Abstract

The invention discloses a blast furnace top feeding winch control system which comprises four multi-transmission high-performance motion control frequency converters, and wire inlet structures of the transmission high-performance motion control frequency converters specifically comprise a system wire inlet structure A, a system wire inlet structure B and a system wire inlet structure C, the A system wire inlet structure comprises an A system wire inlet cabinet, an A system first rectifier cabinet, an A system second rectifier cabinet, an A system first inverter cabinet, an A system second inverter cabinet and an A system resistor cabinet; and B, a system wire inlet structure. A winch control system is optimized, a PLC alternating-current variable-frequency speed regulation mode is adopted, the speed dynamic response is high, the overload capacity is large, operation is safe and reliable, and the PLC self-control technology, the position encoder measurement technology, the large-scale variable-frequency speed regulation dragging technology and the intelligent master controller are organically combined and applied; and the faults of galloping, sliding, derailing and the like of the skip car in operation are reduced through double closed-loop control and multi-section speed control of a current loop and a speed loop of the motor.

Description

Technical Field

[0001] The invention relates to the technical field of winch control, in particular to a blast furnace top charging winch control system. Background Art

[0002] The winch is a part of the blast furnace transmission equipment and one of the most important equipment in the blast furnace transmission system. It is responsible for conveying materials in the blast furnace and is extremely important in production. The stability of the main winch system is directly related to whether the blast furnace can be normally fed. The stability of the winch control system is directly related to the stability of the feeding system and the output of molten iron. Only when the main winch system is stable can it continuously transport various raw materials necessary for smelting to the furnace body. There are two main forms of blast furnace feeding: one is the feeding by the material car winch; the other is the feeding by the conveyor belt. The feeding structure of the winch material car is compact and occupies a small area. It has sufficient feeding capacity for small and medium-sized blast furnaces and can realize automatic control, so it has been widely adopted;

[0003] In the prior art, the rotor winding of the wound-rotor asynchronous motor leads to three outlets through slip rings and brushes, and a three-phase adjustable resistor can be connected externally to improve the speed regulation performance. The rotor series resistor can convert the inherent mechanical characteristics of the motor into artificial mechanical characteristics, thereby achieving speed regulation. Cascade speed regulation must use a special motor. The rotor circuit of this type of motor requires an external speed regulation winding, which has a complex manufacturing process and high manufacturing cost. It is troublesome to repair and the maintenance cost is also relatively high. The reliability of the cascade speed regulation system is low when the power is large. In addition, there are slip rings on the motor rotor, and the maintenance workload is large. When the speed is high, the manufacturing process of the slip ring is complicated. The cascade speed regulation cannot be operated by one motor and multiple motors cannot be switched between the running motor and the standby motor. The control reliability is poor and the speed dynamic response is slow. Summary of the invention

[0004] Therefore, the purpose of the present invention is to provide a blast furnace top charging hoist control system, optimize the hoist control system, adopt PLC AC frequency conversion speed regulation mode, fast speed dynamic response, large overload capacity, safe and reliable operation, organically combine and utilize PLC self-control technology, position encoder measurement technology, large frequency conversion speed regulation drag technology and intelligent master controller, and double closed-loop control and multi-stage speed control of the motor's current loop and speed loop, which reduces the occurrence of faults such as running, slipping, and falling off the track during operation.

[0005] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions: a blast furnace top loading hoist control system, comprising four multi-drive high-performance motion control inverters, wherein the inlet structure of the drive high-performance motion control inverter specifically comprises:

[0006] A system incoming line structure, the A system incoming line structure includes an A system incoming line cabinet, a first rectifier cabinet of the A system, a second rectifier cabinet of the A system, a first inverter cabinet of the A system, a second inverter cabinet of the A system, and an A system resistor cabinet;

[0007] A B system incoming line structure, wherein the B system incoming line structure includes a B system incoming line cabinet, a B system first rectifier cabinet, a B system second rectifier cabinet, a B system first inverter cabinet, a B system second inverter cabinet, and a B system resistor cabinet;

[0008] The A system incoming line structure and the B system incoming line structure are respectively connected to the same outgoing line cabinet.

[0009] As a preferred solution of the blast furnace top loading hoist control system described in the present invention, the A system incoming line structure is used in normal production, the B system incoming line structure is used as a backup incoming line structure, and the control adopts master-slave control;

[0010] Among them, in the master-slave control, one inverter is the master inverter and the other inverter is the slave inverter.

[0011] As a preferred solution of the blast furnace top loading winch control system described in the present invention, data transmission between the master and slave inverters adopts simolink optical cable communication, the central processor adopts Siemens S7-200smartPLC, and the stroke control adopts LC1 intelligent master controller.

[0012] As a preferred solution of the blast furnace top loading hoist control system described in the present invention, the control system is provided with two incoming line cabinets, one for main use and one for standby;

[0013] 4 rectifier cabinets, of which two are main and two are standby;

[0014] 4 inverter cabinets, of which two are main and two are standby;

[0015] One outlet cabinet;

[0016] 2 resistor cabinets;

[0017] Among them, 4 inverter rectifier modules use basic rectifier modules.

[0018] As a preferred solution of the blast furnace top loading winch control system described in the present invention, the basic rectifier module cannot feed back the excess energy during braking to the power grid. If excessive regenerated energy is generated during braking, its energy will be converted into heat through the braking module and the braking resistor and dissipated. The control unit uses CU320-2PN, and the control unit provides a PROFINET interface.

[0019] As a preferred solution of a blast furnace top loading winch control system described in the present invention, the A system incoming line structure and the B system incoming line structure realize mutual switching between the online frequency converter and the standby frequency converter through a switching switch in the outgoing line cabinet.

[0020] As a preferred solution of the blast furnace top loading hoist control system described in the present invention, the switching content between the online frequency converter and the standby frequency converter specifically includes: power supply, control signal, motor pulse encoder signal;

[0021] Each frequency conversion speed regulation device is configured according to the Siemens SINAMIC S120 standard: incoming line circuit breaker, fast fuse, incoming line reactor, rectifier, inverter, outgoing line reactor and communication protocol module.

[0022] As a preferred solution of the blast furnace top loading winch control system described in the present invention, a high-performance intelligent communication link DRIVE-CLIQ is used between the components of the inverter, wherein the DRIVE-CLIQ network is distributed between the inverter components of the A system incoming line structure and the B system incoming line structure, and the control unit CU320-2PN has 4 DRIVE-CLIQ sockets, namely X100, X101, X102, and X103. The control unit is connected to the rectifier 1, rectifier 2, inverter 1, inverter 2, encoder module and expansion module through a DRIVE-CLIQ dedicated cable, and intelligent communication is carried out with each other.

[0023] As a preferred solution of the blast furnace top loading winch control system described in the present invention, the control unit CU320-2PN provides a PROFINET interface to complete the communication with the central processing unit CPU and the touch screen. In this control system, the A system incoming line structure and the B system incoming line structure are respectively controlled by independent PLCs, and the two share a touch screen. The A system control unit, the B system control unit, the touch screen, the A system PLC, and the B system PLC are all connected to a switch, and data exchange is performed through the switch.

[0024] As a preferred solution of the control system of a blast furnace top loading hoist described in the present invention, wherein, an opening and closing controller component, the controller component includes a controller body, a mounting frame fixed to the side wall of the controller body, a fixing plate fixed to the inner side of the mounting frame, a shifting plate arranged on the opposite side of the fixing plate, a threaded hole opened in the frame of the mounting frame, a threaded long rod passing through the threaded hole, and a round plate connected to the end of the threaded long rod;

[0025] A stabilizing component includes a first arc-shaped placement groove opened on the surface of the fixing plate, an annular placement plate inserted into the first arc-shaped placement groove, a strong magnetic strip arranged on the surface of the annular placement plate, a second arc-shaped placement groove opened on the surface of the displacement plate, an iron strip fixed on the surface of the displacement plate, and a cable arranged between the fixing plate and the displacement plate.

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] 1. Fast speed dynamic response, large overload capacity, safe and reliable operation.

[0028] 2. Organically combine and apply PLC self-control technology, position encoder measurement technology, large-scale variable frequency speed regulation traction technology and intelligent master controller.

[0029] 3. Double closed-loop control of the motor's current loop and speed loop and multi-speed control.

[0030] 4. Reduce the occurrence of material car running away, slipping, falling off the track and other faults during operation.

[0031] 5. Through the cooperation of the opening and closing controller component and the stabilizing component, the connection cables of the controller can be reserved and limited as a whole during use to avoid the cable connection port being loosened by external tension and causing it to fall off. Compared with the prior art in which the plate is pressed and limited, this solution increases the contact area with the cable from the entire circular surface of the cable, limits the cable as a whole, and avoids the cable being squeezed and deformed by force. In addition, the optimized structural design automatically brings the cable out of the placement slot when the shift plate is opened. This eliminates the need for staff to take out the cable, reduces the operating steps, and facilitates use.

[0032] In actual use, PLC AC frequency conversion speed control is adopted to control the blast furnace top loading winch. Its main transmission control device adopts 4 Siemens latest DC / AC multi-axis transmission frequency converters SINAMICS S120. The internal control software of S120 frequency converter is used to realize multi-level speed control, load balance control and brake control of the material car. Two of them are in production and two are in standby. The control adopts master-slave control, one frequency converter is the master frequency converter and the other is the slave frequency converter. The data transmission between the master and slave frequency converter adopts Simolink optical cable communication. The central processor adopts Siemens S7-200smart PLC, stroke control adopts LC1 intelligent master controller, and its electric control system consists of incoming line cabinet, rectifier cabinet, inverter cabinet, outgoing line cabinet, PLC cabinet, brake resistor cabinet, and machine side operation box to control the feeding trolley. This control system runs smoothly and reliably, and is energy-saving and environmentally friendly. It fully meets the production process requirements and replaces the traditional winding cascade speed regulation method, making the speed dynamic response fast, the overload capacity large, and the operation safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0034] Figure 1 It is a system scheme diagram of the present invention;

[0035] Figure 2 is a network communication distribution diagram of the present invention;

[0036] Figure 3 It is a structural diagram of the controller body of the present invention;

[0037] Figure 4 It is a position structure diagram of the first arc-shaped placement groove of the present invention;

[0038] Figure 5 It is a position structure diagram of the second arc-shaped placement groove of the present invention;

[0039] Figure 6 It is a distribution structure diagram of the cable of the present invention.

[0040] In the figure: 1. A system incoming cabinet; 2. B system incoming cabinet; 3. A system first rectifier cabinet; 4. A system second rectifier cabinet; 5. B system first rectifier cabinet; 6. B system second rectifier cabinet; 7. A system first inverter cabinet; 8. A system second inverter cabinet; 9. B system first inverter cabinet; 10. B system second inverter cabinet; 31. A system resistor cabinet; 32. Outgoing cabinet; 33. B system resistor cabinet; 11. Controller body; 12. Mounting frame; 13. Fixing plate; 14. Shifting plate; 15. Long threaded rod; 16. Threaded hole; 17. Round plate; 21. First arc-shaped placement groove; 22. Ring placement plate; 23. Strong magnetic strip; 24. Second arc-shaped placement groove; 25. Iron bar; 26. Cable. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general scale, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional space dimensions of length, width and depth should be included.

[0044] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0045] The invention provides a control system for a blast furnace top feeding hoist, optimizes the hoist control system, adopts a PLC AC variable frequency speed regulation mode, has fast speed dynamic response, large overload capacity, safe and reliable operation, organically combines and utilizes PLC self-control technology, position encoder measurement technology, large variable frequency speed regulation drag technology and an intelligent master controller, and has a current loop and speed loop double closed-loop control and multi-stage speed control of the motor, thereby reducing the occurrence of faults such as runaway, slipping and falling off the track of the material car during operation.

[0046] Figure 1-Figure 6 The overall structure diagram of a blast furnace top loading winch control system of the present invention is shown in FIG. Figure 1-Figure 6 The main structure of this implementation method includes four multi-drive high-performance motion control inverters, and the incoming line structure of the drive high-performance motion control inverter specifically includes:

[0047] A system incoming line structure, the A system incoming line structure includes an A system incoming line cabinet 1, a first A system rectifier cabinet 3, a second A system rectifier cabinet 4, a first A system inverter cabinet 7, a second A system inverter cabinet 8, and an A system resistor cabinet 31;

[0048] B system incoming line structure, the B system incoming line structure includes a B system incoming line cabinet 2, a B system first rectifier cabinet 5, a B system second rectifier cabinet 6, a B system first inverter cabinet 9, a B system second inverter cabinet 10 and a B system resistor cabinet 33;

[0049] The incoming line structure of system A and the incoming line structure of system B are respectively connected to the same outgoing line cabinet 32;

[0050] Normal production uses the A system incoming line structure, and the B system incoming line structure is used as a backup incoming line structure. The control adopts master-slave control;

[0051] Among them, in the master-slave control, one inverter is the master inverter and the other inverter is the slave inverter;

[0052] This control system is equipped with two incoming line cabinets, one for main use and one for standby;

[0053] 4 rectifier cabinets, of which two are main and two are standby;

[0054] 4 inverter cabinets, of which two are main and two are standby;

[0055] One outlet cabinet 32;

[0056] 2 resistor cabinets;

[0057] Among them, the rectifier modules of 4 inverters use basic rectifier modules;

[0058] In actual use, PLC AC frequency conversion speed control is adopted to control the blast furnace top loading winch. Its main transmission control device adopts 4 Siemens latest DC / AC multi-axis transmission frequency converters SINAMICS S120. The internal control software of S120 frequency converter is used to realize multi-level speed control, load balance control and brake control of the material car. Two of them are in production and two are in standby. The control adopts master-slave control, one frequency converter is the master frequency converter and the other is the slave frequency converter. The data transmission between the master and slave frequency converter adopts Simolink optical cable communication. The central processor adopts Siemens S7-200smart PLC, stroke control adopts LC1 intelligent master controller, and its electric control system consists of incoming line cabinet, rectifier cabinet, inverter cabinet, outgoing line cabinet, PLC cabinet, brake resistor cabinet, and machine side operation box to control the feeding trolley. This control system runs smoothly and reliably, and is energy-saving and environmentally friendly. It fully meets the production process requirements and replaces the traditional winding cascade speed regulation method, making the speed dynamic response fast, the overload capacity large, and the operation safe and reliable.

[0059] Furthermore, the opening and closing controller assembly is used in conjunction with the stabilizing assembly. Specifically, the controller assembly includes a controller body 11, a mounting frame 12 fixed to the side wall of the controller body 11, a fixing sheet 13 fixed to the inner side of the mounting frame 12, a shifting sheet 14 arranged on the opposite side of the fixing sheet 13, a threaded hole 16 opened in the frame of the mounting frame 12, a threaded long rod 15 passing through the threaded hole 16, and a round sheet 17 connected to the end of the threaded long rod 15;

[0060] During specific use, the user places the cable 26 between the fixed plate 13 and the shifting plate 14, and then the user rotates the threaded long rod 15, the threaded long rod 15 drives the round plate 17 to move forward, directly pressing the shifting plate 14, and the stabilizing component is installed and used based on the opening and closing controller component.

[0061] The stabilizing component is used to prevent the line from falling off and increase the contact area, prevent the line from being pressed and deformed, and there is no need to manually remove the cable 26. Specifically, the stabilizing component includes a first arc-shaped placement groove 21 opened on the surface of the fixing plate 13, an annular placement plate 22 inserted into the first arc-shaped placement groove 21, a strong magnetic strip 23 arranged on the surface of the annular placement plate 22, a second arc-shaped placement groove 24 opened on the surface of the displacement plate 14, an iron strip 25 fixed on the surface of the displacement plate 14, and a cable 26 arranged between the fixing plate 12 and the displacement plate 14;

[0062] During specific use, when the fixing plate 13 is docked with the shift plate 14, the cable 26 is limited in the first arc-shaped placement groove 21 and the second arc-shaped placement groove 22. The first arc-shaped placement groove 21 and the second arc-shaped placement groove 22 are docked to form a U-shaped groove, which completely includes the cable 26. Such a structural design is used when one end of the cable 26 is subjected to force, and the cable 26 is limited by the U-shaped structural distribution. In this way, the cable 26 located in the first arc-shaped placement groove 21 and the second arc-shaped placement groove 22 will move slowly, thereby relieving the tension and preventing the connecting end of the cable 26 from being subjected to force and causing it to fall off. In addition, such a slowly moving structural design prevents the cable 26 from being limited to a dead position, resulting in the cable 26 being directly broken when the tension is large. When the shift plate 14 is closed, the strong magnetic strip 23 is adsorbed by the iron bar 25. In this way, when the shift plate 14 is opened, the cable 26 is directly brought out by the distributed annular placement plate 22. In this way, there is no need to move the cable 26 out, which is convenient for use.

[0063] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A blast furnace top loading winch control system, comprising four multi-drive high-performance motion control inverters, characterized in that: The line-in structure of the transmission high-performance motion control inverter includes: A system incoming line structure, the A system incoming line structure comprising an A system incoming line cabinet (1), an A system first rectifier cabinet (3), an A system second rectifier cabinet (4), an A system first inverter cabinet (7), an A system second inverter cabinet (8), and an A system resistor cabinet (31); A B system incoming line structure, the B system incoming line structure comprising a B system incoming line cabinet (2), a B system first rectifier cabinet (5), a B system second rectifier cabinet (6), a B system first inverter cabinet (9), a B system second inverter cabinet (10) and a B system resistor cabinet (33); The A system incoming line structure and the B system incoming line structure are respectively connected to the same outgoing line cabinet (32).

2. A blast furnace top loading winch control system according to claim 1, characterized in that: Normal production uses the A system incoming line structure, and the B system incoming line structure is used as a backup incoming line structure. The control adopts master-slave control; The master-slave control includes two frequency converters, one frequency converter is a master frequency converter, and the other frequency converter is a slave frequency converter.

3. A blast furnace top loading winch control system according to claim 2, characterized in that: The data transmission between the master inverter and the slave inverter adopts simolink optical cable communication, the central processor adopts Siemens S7-200smartPLC, and the stroke control adopts LC1 intelligent master controller.

4. A blast furnace top loading hoist control system according to claim 3, characterized in that: It includes 2 incoming line cabinets, one for main use and one for backup; 4 rectifier cabinets, two for main use and two for standby use; 4 inverter cabinets, two inverter cabinets are used as main cabinets, and two inverter cabinets are used as backup cabinets; 1 outlet cabinet (32); 2 resistor cabinets; Among them, the rectifier modules of the four rectifier cabinets are basic rectifier modules.

5. A blast furnace top loading winch control system according to claim 4, characterized in that: The energy generated during braking is converted into heat through the braking module and the braking resistor. The control unit uses CU320-2PN, which provides a PROFINET interface.

6. A blast furnace top loading hoist control system according to claim 5, characterized in that: The A system incoming line structure and the B system incoming line structure realize mutual switching between the master frequency converter and the slave frequency converter through a switching switch of the outgoing line cabinet (32).

7. A blast furnace top loading hoist control system according to claim 6, characterized in that: The structure for switching between the master inverter and the slave inverter includes: power supply, control signal, motor pulse encoder signal; Each frequency conversion speed regulation device is configured according to the Siemens SINAMIC S120 standard: incoming line circuit breaker, fast fuse, incoming line reactor, rectifier, inverter, outgoing line reactor and communication protocol module.

8. A blast furnace top loading hoist control system according to claim 7, characterized in that: A high-performance intelligent communication link DRIVE-CLIQ is used between the inverter components. The DRIVE-CLIQ network is distributed between the inverter components of the A system incoming line structure and the B system incoming line structure. The control unit CU320-2PN has four DRIVE-CLIQ sockets, namely X100, X101, X102, and X103. The control unit is connected to rectifier 1, rectifier 2, inverter 1, inverter 2, encoder module and expansion module through DRIVE-CLIQ special cables to communicate with each other.

9. A blast furnace top loading hoist control system according to claim 8, characterized in that: The control unit CU320-2PN provides a PROFINET interface to complete the communication with the central processing unit CPU and the touch screen. In this control system, the incoming line structure of system A and the incoming line structure of system B are controlled by independent PLCs respectively, and the two share a touch screen. The control unit of system A, the control unit of system B, the touch screen, the PLC of system A, and the PLC of system B are all connected to a switch, and data is exchanged through the switch.

10. A blast furnace top loading hoist control system according to claim 9, characterized in that: Also includes: An opening and closing controller assembly, the controller assembly comprising a controller body (11), a mounting frame (12) fixed to a side wall of the controller body (11), a fixing plate (13) fixed to the inner side of the mounting frame (12), a shifting plate (14) arranged on the opposite side of the fixing plate (13), a threaded hole (16) provided in the frame of the mounting frame (12), a threaded long rod (15) passing through the threaded hole (16), and a round plate (17) connected to the end of the threaded long rod (15); A stabilizing component, the stabilizing component comprising a first arc-shaped placement groove (21) provided on the surface of the fixing plate (13), an annular placement plate (22) inserted into the first arc-shaped placement groove (21), a strong magnetic strip (23) provided on the surface of the annular placement plate (22), a second arc-shaped placement groove (24) provided on the surface of the displacement plate (14), an iron strip (25) fixed on the surface of the displacement plate (14), and a cable (26) provided between the fixing plate (12) and the displacement plate (14).

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