LF (ladle furnace) buggy ladle positioning device

Abstract

The utility model relates to an LF (ladle furnace) buggy ladle position positioning device, which aims to solve the technical problems that the working environment of the LF buggy ladle is severe, and equipment is easy to damage, and adopts the technical scheme that the LF buggy ladle position positioning device comprises a buggy ladle, a position detection switch, a PLC (programmable logic controller) control system and a variable-frequency transmission system, and limiting points are arranged on a track and comprise a ladle seat position, a ladle hoisting position, a capping position and a smelting position; the position detection switch is arranged at a smelting position; the PLC control system is electrically connected with the variable-frequency transmission system and the position detection switch, and the variable-frequency transmission system is electrically connected with the buggy ladle and drives the buggy ladle to run along the track. The PLC control system reads the state information of the motor of the buggy ladle from the variable frequency transmission system in real time and determines the traveling distance of the buggy ladle according to the state information. According to the utility model, the buggy ladle can be positioned only by using one position detection switch at a smelting position, so that the severe environment under a furnace is avoided to the greatest extent, the damage rate of equipment is reduced, and the maintenance and overhaul are convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical automation, and in particular relates to a position positioning device for a ladle car of an LF furnace. Background Art

[0002] Currently, the main methods for locating the ladle cars in LF furnaces include position limiting, laser ranging, and encoder ranging. Ladle cars typically have positions such as smelting, ladle capping, ladle hanging, and ladle seating. If the position limiting method is used, each position requires a deceleration position sensor and a stop position sensor, requiring at least eight position limiting sensors. The harsh environment under the furnace makes the equipment extremely susceptible to damage, requiring extensive and dangerous maintenance, making it difficult to measure on-site. The laser ranging method, on the other hand, uses a laser rangefinder installed at the end of the track to measure the distance from the instrument to the vehicle, defining each position point using that distance. This method is relatively accurate but susceptible to interference, requiring the laser to be unobstructed. However, the complex on-site personnel and vehicles, the high dust content, the easily damaged reflectors installed on the vehicles due to high temperatures, the long measurement distance, and the frequent interference and malfunctions make this method unsuitable for on-site measurement. In addition, the encoder ranging method locates the vehicle by installing an encoder on the vehicle to count pulses. This method requires the laying of encoder cables, which are multi-core (more than seven cores) shielded flexible control cables. When burned, on-site repair wiring is difficult. On-site cables are extremely easy to burn and difficult to protect, so it is not conducive to on-site measurement.

[0003] Therefore, it is necessary to provide a stable and reliable positioning method and device for on-site positioning measurement of LF furnace ladle cars, which has high accuracy, is easy to use, and is easy to maintain. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and provide a positioning device for a ladle car of an LF furnace.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A positioning device for a ladle car of an LF furnace, comprising a ladle car, a position detection switch, a PLC control system and a variable frequency drive system, wherein limit points are set on the track, the limit points including a ladle seating position, a ladle hanging position, a capping position and a smelting position, and the position detection switch is set at the smelting position;

[0007] The PLC control system is electrically connected to the frequency conversion drive system and the position detection switch respectively. The frequency conversion drive system is electrically connected to the ladle car to drive the ladle car along the track. The PLC control system reads the status information of the ladle car motor from the frequency conversion drive system in real time and uses the status information to determine the vehicle's travel distance.

[0008] Furthermore, track stops are provided at both ends of the track.

[0009] Furthermore, an anti-collision marking is provided on the track inside the track stop, and the area between the track stop and the anti-collision marking is an anti-collision zone. An operating limit marking is provided on the track between the anti-collision marking and the ladle car, and the area between the anti-collision marking and the operating limit marking is an operating limit zone.

[0010] Furthermore, the variable frequency drive system adopts an encoderless vector control method.

[0011] Furthermore, it also includes an HMI human-computer interaction system, which is electrically connected to the PLC control system and is used to display the coordinate system image constructed by the PLC control system in real time.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The utility model can realize the positioning of the ladle car by using only one position detection switch at the smelting position, thus avoiding the harsh environment under the furnace to the greatest extent, reducing the damage rate of the equipment and facilitating maintenance and repair;

[0014] 2. The utility model can control the accurate positioning of the ladle car throughout the whole process, can automatically interlock and stop, and can perform follow-up control during the automatic tapping process of the LF furnace. At the same time, the device can save a large number of limit switches and cables, greatly reducing the maintenance workload; it can eliminate safety hazards, prevent the ladle car from being pushed over by the slag car during the tapping process, avoid accidents; prevent the cable from being pulled off by the passing vehicle, thereby effectively avoiding such accidents; and avoid the danger of personnel repairing the limit switch under the furnace, etc.

[0015] 2. The utility model sets track stops, operating limit zones and anti-collision zones on the track, which can limit the safe driving distance of the ladle car, so that the ladle car can run within a reasonable range, prevent the ladle car from hitting the track stops during the steel tapping process, avoid accidents and eliminate safety hazards;

[0016] 3. The HMI human-computer interaction system of the present invention can be used to display the coordinate system image constructed by the PLC control system in real time. Parameters such as the running status of the ladle car, such as the running direction and running distance, can also be set through the HMI human-computer interaction system. Automatic interlocking and automatic start and stop can be achieved through the PLC control system, and follow-up control can be performed during the automatic tapping process of the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 This is a schematic diagram of the electrical connection of the present utility model.

[0019] In the figure: 1. Track; 2. Ladle car; 3. Ladle seating position; 4. Ladle lifting position; 5. Covering position; 6. Smelting position; 7. Track stop; 8. Position detection switch; a. Anti-collision zone; b. Operation limit zone. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1-2 As shown, a positioning device for a ladle car of an LF furnace includes a ladle car 2, a position detection switch 8, a PLC control system, a variable frequency drive system and an HMI human-computer interaction system. Limit points are set on the track 1, and the limit points include a seating position 3, a hanging position 4, a covering position 5 and a smelting position 6. The position detection switch 8 is set at the smelting position 6. Track stops 7 are set at both ends of the track 1. An anti-collision marking line is provided on the track 1 inside the track stop 7. The anti-collision zone a is formed between the track stop 7 and the anti-collision marking line. An operating limit marking line is provided on the track 1 between the anti-collision marking line and the ladle car 2. The operating limit zone b is formed between the anti-collision marking line and the operating limit marking line.

[0022] The variable frequency drive system adopts an encoderless vector control method. The PLC control system is electrically connected to the variable frequency drive system, the position detection switch 8, and the HMI human-computer interaction system respectively. The variable frequency drive system is electrically connected to the ladle car 2 to drive the ladle car 2 along the track; the PLC control system reads the status information of the ladle car 2 motor from the variable frequency drive system in real time, and uses the status information to determine the vehicle's travel distance. The HMI human-computer interaction system is used to display the coordinate system image constructed by the PLC control system in real time.

[0023] The working process of this utility model:

[0024] The PLC control system reads the status information of the ladle car 2 motor in real time through the variable frequency drive system, including speed, travel direction, gear ratio, wheel circumference, etc. The obtained status information is used to determine the vehicle travel distance using the following formula:

[0025] Where L represents the vehicle travel distance, K represents the correction coefficient, n(t) represents the continuous time domain speed, Z represents the gear ratio, C represents the wheel circumference, ni represents the speed sampling value at different times, and Δt represents the sampling calculation period.

[0026] With smelting position 6 as the zero position and the length of track 1 as the horizontal coordinate, a coordinate system about the limit point is constructed;

[0027] The PLC control system obtains the zero position data measured by the position detection switch 8 in real time, and uses the zero position data as a calibration value. During the forward and reverse movement of the ladle car 2 along the track 1, a calibration value is assigned each time the ladle car 2 passes the position detection switch 8, and the travel distance of the ladle car 2 is corrected to eliminate the cumulative error. The position is automatically corrected at least once for each heat of steel to eliminate the cumulative error, so that the ladle car can be accurately positioned throughout the entire process.

[0028] The specific position of the ladle car 2 in the coordinate system is determined based on the corrected travel distance, and compared with the positions of each limit point to limit the position of the ladle car 2. During the automatic tapping process of the LF furnace, the ladle car 2 can be controlled to run between the limit points such as the smelting position 6, the capping position 5, the ladle hanging position 4, and the ladle seating position 3.

[0029] The HMI human-computer interaction system is connected to the PLC control system for interactive communication and is used to display the coordinate system image constructed by the PLC control system in real time. Parameters such as the running status of the ladle car, such as the running direction and running distance, are set through the HMI human-computer interaction system. Automatic interlocking and automatic start and stop are achieved through the PLC control system, and follow-up control can be performed during the automatic tapping process of the converter.

Claims

1. A LF furnace ladle car positioning device, characterized in that: The invention comprises a ladle car (2), a position detection switch (8), a PLC control system and a variable frequency drive system, wherein limit points are set on the track (1), the limit points including a ladle seating position (3), a ladle hanging position (4), a capping position (5) and a smelting position (6), and the position detection switch (8) is set at the smelting position (6); The PLC control system is electrically connected to the variable frequency drive system and the position detection switch (8) respectively. The variable frequency drive system is electrically connected to the ladle car (2) to drive the ladle car (2) to travel along the track. The PLC control system reads the status information of the motor of the ladle car (2) from the variable frequency drive system in real time and uses the status information to determine the travel distance of the vehicle.

2. The LF furnace ladle car positioning device according to claim 1, characterized in that: Track stops (7) are provided at both ends of the track (1).

3. The LF furnace ladle car positioning device according to claim 2, characterized in that: An anti-collision marking line is provided on the track (1) inside the track stop (7), and an anti-collision zone (a) is formed between the track stop (7) and the anti-collision marking line. An operation limit marking line is provided on the track (1) between the anti-collision marking line and the ladle car (2), and an operation limit zone (b) is formed between the anti-collision marking line and the operation limit marking line.

4. The LF furnace ladle car positioning device according to claim 1, characterized in that: The variable frequency drive system adopts an encoderless vector control method.

5. The LF furnace ladle car positioning device according to claim 1, characterized in that: It also includes an HMI human-computer interaction system, which is electrically connected to the PLC control system and is used to display the coordinate system image constructed by the PLC control system in real time.

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