A wireless limiting positioning system and control method for a ladle tilting platform

Abstract

The application discloses a wireless limiting positioning system of a ladle tilting table, which comprises a limiting device arranged in the inner side of an ear shaft pushing cylinder, and the limiting device is limited through the knocking action of the ear shaft pushing cylinder, so that the limiting device generates a limiting signal; a signal receiving unit is used for receiving the limiting signal of the limiting device and outputting a control signal; and a driving device unit is used for receiving the control signal of the signal receiving unit and controlling the tilting table to rotate to a set angle. The application further discloses a wireless limiting positioning control method of a ladle tilting table. The application cancels the cable and reel of the existing positioning limiting device, and determines the actual position of the ear shaft by means of wireless signal transmission, so as to ensure the production safety.

Description

Technical Field

[0001] This invention relates to a ladle tilting table in converter production, and more specifically, to a wireless limit positioning system and control method for a ladle tilting table. Background Technology

[0002] In converter production, ladle tilting tables are widely used as repair and maintenance devices for converter ladle nozzles. As a ladle nozzle repair platform, such as... Figure 1 As shown, its working principle is as follows: after the ladle is placed in the tilting table working position 400, the trunnion 401 of the tilting table locks the ladle lifting ring. First, the ladle is rotated 180 degrees counterclockwise to pour out the waste residue inside the ladle; then, the ladle is rotated 90 degrees clockwise to repair the ladle sliding gate. However, during use, there have been multiple accidents where the ladle fell when it was rotated to 180 degrees, and there have also been accidents where operators mishandled the operation, causing the ladle to fall, or the crane pulled the entire tilting table off the ground, resulting in serious safety accidents and equipment failures.

[0003] Because the locking of the ladle's lifting rings is solely determined by the four "trunnion closed" limit switches, a malfunction in the equipment can cause a false signal, leading to the ladle tilting without being locked and resulting in a fall. Similarly, when the ladle is at 180 degrees, an operator may accidentally open the trunnion due to a signal malfunction or by accidentally striking the "trunnion open" button on the control panel, causing another ladle fall. The primary cause of these accidents is the abnormality of the four locking position limit signals. Further analysis reveals that because the tilting table is a rotating device, the limit signals are transmitted to the control cabinet via a reel and cable. These cables are susceptible to high-temperature melting and mechanical damage, causing signal abnormalities and ultimately leading to accidents. Summary of the Invention

[0004] To address the aforementioned deficiencies in the existing technology, the purpose of this invention is to provide a wireless limit positioning system and control method for a ladle tilting table, eliminating the need for existing positioning and limit cables and reels, and relying on wireless signal transmission to determine the actual position of the trunnion, thereby ensuring production safety.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] On the one hand, a wireless limit positioning system for a ladle tilting table includes:

[0007] A limiting device is located inside the trunnion pushing cylinder. The limiting device generates a limiting signal by the striking action of the trunnion pushing cylinder.

[0008] A signal receiving unit is used to receive the limit signal from the limiting device and output a control signal;

[0009] The drive unit is used to receive control signals from the signal receiving unit and control the tilt table to rotate to a set angle.

[0010] Preferably, the trunnion pushes the cylinder out, and the limiting device generates a locking limit signal; the trunnion pushes the cylinder in retraction, and the limiting device generates an opening limit signal.

[0011] Preferably, the limiting device includes a limiting housing and a signal sensing module, a signal processing module, a signal transmitting module, and a communication antenna disposed within the limiting housing and connected in sequence according to signals.

[0012] Preferably, the limiting housing is equipped with a power supply battery.

[0013] Preferably, the signal sensing module is a combination of a reed switch and a permanent magnet, or a combination of a spring, a striker, and a striker block.

[0014] Preferably, the signal receiving unit includes a base and a signal receiving antenna, a signal conversion module, a delay module, and a control relay disposed on the base and connected in sequence according to the signal.

[0015] The signal receiving antenna and the communication antenna are connected wirelessly.

[0016] Preferably, the drive unit is a motor;

[0017] The motor is equipped with an encoder.

[0018] On the other hand, a wireless limit positioning control method for a ladle tilting table uses the aforementioned wireless limit positioning system to achieve forward and reverse rotation control of the tilting table.

[0019] The forward rotation control includes the following steps:

[0020] S1. The crane hoists the ladle and places it on the tilting platform. The operator selects a tilting angle of 120 degrees. After the operator's forward rotation command is triggered, the control cabinet sends a command to the tilting platform to lock the trunnion and to move the locking pin, and the tilting platform starts to operate.

[0021] S2. When the locking pin is in the push position, the trunnion reaches the locking position, the photosensitive switch on the trunnion generates a signal, the delay module closes and sends a trunnion locking limit signal to the signal receiving unit at a preset time.

[0022] S3. The signal receiving unit receives the limit signal, the delay module locks the limit signal, the trunnion locks the limit conduction, and sends a control signal to the contactor that executes the forward rotation command.

[0023] S4. The motor drives the tilting table to rotate to 120 degrees, the encoder outputs a signal, and the tilting table stops rotating;

[0024] The inversion control includes the following steps:

[0025] A. When the tilt angle is selected as 0 degrees, the tilt table starts to operate after the operator's reverse command is triggered.

[0026] B. When the motor drives the tilting table to rotate to 0 degrees, the encoder outputs a signal, and the tilting table stops rotating.

[0027] C. After the tilting table returns to the zero position, the trunnion opens. When the trunnion reaches the open position, the photosensitive switch on the trunnion does not generate a signal. The delay module closes and sends a trunnion opening limit signal to the signal receiving unit according to a preset time.

[0028] D. The signal receiving unit receives the limit signal, the delay module locks the limit signal, the trunnion opens and the limit is turned on, an insertion command is sent to the locking pin, the delay module closes and sends the trunnion opening limit signal to the signal receiving unit at a preset time;

[0029] E. Send a signal to allow lifting; the indicator light will illuminate.

[0030] Preferably, both the forward control and the reverse control further include a control stop step, specifically:

[0031] When the stop button on the operator is triggered, the operator sends a stop rotation command to the tilting table, the stop relay closes, and the tilting table stops rotating.

[0032] This invention provides a wireless limit positioning system and control method for a ladle tilting table, which enables wireless limit control of the tilting table, ensuring operational safety, improving work efficiency, reducing equipment failure rate, and increasing economic benefits. Furthermore, this invention employs an RF agile transceiver integrating radio frequency and baseband processing, reducing the power consumption, size, and complexity of the RF circuit while ensuring excellent performance. Flexible configuration of communication frequency bands and operating modes can be achieved through software, not only increasing the effective remote control distance of the system but also making the system hardware platform universal and scalable, ensuring high efficiency and reliability. This technical approach facilitates the rapid implementation of intelligent tilting table control. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of an existing ladle tilting table;

[0034] Figure 2 This is a schematic diagram of the frame of the limiting device in the wireless limiting and positioning system of the ladle tilting table of the present invention;

[0035] Figure 3 This is a schematic diagram of the frame of the signal receiving unit in the wireless limit positioning system of the ladle tilting table of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the wireless limit positioning system for the ladle tilting table of the present invention;

[0037] Figure 5 This is a schematic diagram of the installation layout of the wireless limit positioning system for the ladle tilting table. Detailed Implementation

[0038] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] Combination Figures 2 to 5 As shown, the present invention provides a wireless limit positioning system for a ladle tilting table, characterized in that it includes:

[0040] The limiting device 1 is located inside the trunnion-driven cylinder 402. The trunnion-driven cylinder 402 is used to limit the movement by striking the cylinder, thereby generating a limiting signal.

[0041] The trunnion pushing the cylinder 402 out is a closed signal (locked), and the trunnion pushing the cylinder 402 retract is an open signal (unlocked / opened).

[0042] Signal receiving unit 2 is used to receive the limit signal from the limit device 1 and output a control signal;

[0043] The drive unit 3 is used to receive the control signal from the signal receiving unit 2 and control the tilt table to rotate to a set angle.

[0044] See again Figure 2 As shown, the limiting device 1 includes a limiting housing 101 and a signal sensing module 102, a signal processing module 103, a signal transmitting module 104 and a communication antenna 105 disposed within the limiting housing 101 and connected in sequence.

[0045] The limiting housing 101 is equipped with a power supply battery 106.

[0046] The signal sensing module 102 is a combination of a reed switch and a permanent magnet, or a combination of a spring 107, a striker 108, and a striker block (e.g.) Figure 4 (As shown). When the permanent magnet approaches the reed switch's sensing area, the reed switch turns on, sending a switching signal to the signal processing module.

[0047] The signal processing module 103 includes functions such as grouping, modulation, and digital filtering, and transmits the acquisition results to the signal receiving unit 2 in wireless mode.

[0048] See again Figure 3 As shown, the signal receiving unit 2 includes a base 201 and a signal receiving antenna 202, a signal conversion module 203, a delay module 204 and a control relay 205 disposed on the base 201, which are connected in sequence.

[0049] The signal receiving antenna 202 and the communication antenna 105 are connected wirelessly.

[0050] The signal receiving unit 2 and the control relay 205 form a whole, used to receive the signal sent by the limit device 1. The signal receiving unit 2 is used to decode the signal sent by the limit device 1, and after receiving the limit signal, it turns on the control driver condition to drive the drive device unit 3 to rotate the tilting table to the set angle.

[0051] The signal conversion module 203 has functions such as amplification, filtering, digital filtering, demodulation, and descrambling. It encodes the received wireless signal and then decodes it to obtain the control signal corresponding to the limit signal.

[0052] The delay module 204 is used for delayed disconnection and delayed connection after receiving a signal.

[0053] The signal sensing module 102 activates the control circuit based on the received signal. The pairing function in the signal transmitting module 104 is used for pairing and connecting the signal transmitting module 104 with the signal receiving unit 2 during state setting.

[0054] The drive unit 3 is a motor, and the motor is equipped with an encoder.

[0055] The trunnion open limit switch is connected to the control relay 205 through the open delay module 204, and the trunnion closed proximity switch is connected to the control relay 205 through the closed delay module 204. The delay module 204 can prevent the signal transmitting module 104 from being continuously turned on and transmitting signals when the trunnion limit is in the open or closed position, thus preventing the signal transmitting module 104 from being constantly turned on and burning out. It can also effectively avoid unnecessary waste caused by excessive power consumption of the remote control. If the signal transmitting module 104 is constantly transmitting signals, it will cause the signal transmitting module 104 to consume power quickly and overheat, leading to failure. In addition, the trunnion open relay and the trunnion closed relay are interlocked.

[0056] The trunnion open limit switch and trunnion closed limit switch adopt the reed switch node mode. A permanent magnet that cooperates with the reed switch is set on the cylinder. The beneficial effects of adopting the above-mentioned further solution are: the reed switch has a lower cost, higher sensitivity, and can adapt to the harsh environment of the steel plant.

[0057] A set of photosensitive switches is installed in the center of the trunnion. The normally closed signal is taken. When the trunnion is closed, the output signal is connected in series with the "trunnion closed" signal. The trunnion is determined to be closed only when both the magnetic switch signal and the "trunnion closed" signal are present. The tilting table is ready to rotate, and the ladle can rotate.

[0058] To prevent accidental operation in abnormal conditions, a selector switch for "rotation is allowed" and "rotation is not allowed" is added to the control panel. When "rotation is not allowed" is selected, the main circuit power supply of the system is cut off to ensure that the trunnion will not open and the ladle will not fall due to accidental operation during ladle repair. When "rotation is allowed" is selected, the main circuit power supply must be connected first, and the trunnion must be locked before the ladle can be rotated, ensuring that the ladle will not fall accidentally.

[0059] A square groove is added to the ladle lifting ring, and a square cam 403 is added to the trunnion 401 of the tilting table. When the trunnion 401 is locked, the cam 403 engages in the groove, more effectively locking the ladle lifting ring. Furthermore, if the trunnion cylinder on one side leaks internally during ladle maintenance, the cylinder on that side can effectively engage the lifting ring, allowing for an emergency return to the ladle's vertical position and preventing a ladle fall accident.

[0060] See again Figure 5 As shown, the present invention also discloses a wireless limit positioning control method for a ladle tilting table, which uses the wireless limit positioning system of the present invention to realize the forward and reverse rotation control of the tilting table.

[0061] Forward rotation control includes the following steps:

[0062] S1. The crane hoists the ladle and places it in the working position 400 of the tilting table. The operator selects a tilting angle of 120 degrees. After the operator's forward rotation command is triggered, the control cabinet sends a command to the tilting table to lock the trunnion 401 and to release the locking pin 404. The tilting table then begins to operate.

[0063] S2, when the locking pin 404 is in the push position, the trunnion 401 reaches the locking position, the photosensitive switch 405 on the trunnion 401 generates a signal, the delay module 204 closes and sends the trunnion locking limit signal to the signal receiving unit 2 according to the preset time;

[0064] S3. Signal receiving unit 2 receives the limit signal, delay module 204 locks the limit signal, trunnion lock limit is turned on, and a control signal is sent to the contactor that executes the forward rotation command.

[0065] S4. The motor drives the tilt table to rotate to 120 degrees, the encoder outputs a signal, and the tilt table stops rotating;

[0066] Reverse control includes the following steps:

[0067] A. When the tilt angle is selected as 0 degrees, the tilt table will start operating after the operator's reverse command is triggered.

[0068] B. When the motor drives the tilt table to rotate to 0 degrees, the encoder outputs a signal, and the tilt table stops rotating.

[0069] C. After the tilting table returns to the zero position, the trunnion 401 opens. When the trunnion 401 reaches the open position, the photosensitive switch 405 on the trunnion 401 does not generate a signal. The delay module 204 closes and sends the trunnion opening limit signal to the signal receiving unit 2 according to the preset time.

[0070] D. The signal receiving unit 2 receives the limit signal, the delay module 204 locks the limit signal, the trunnion 401 opens the limit conduction, sends an insertion command to the locking pin 404, the delay module 204 closes and sends the trunnion opening limit signal to the signal receiving unit 2 according to the preset time.

[0071] E. Send a signal to allow lifting; the indicator light will illuminate.

[0072] Both forward and reverse control include a stop control step, specifically:

[0073] When the stop button on the operator is triggered, the operator sends a stop rotation command to the tilting table, the stop relay closes, and the tilting table stops rotating.

[0074] Example

[0075] See again Figures 2 to 5 As shown in this embodiment, a ladle tilting table wireless limit positioning system and control method are used in the converter steelmaking operation area of ​​a steel plant for ladle tilting table maintenance of ladle sliding nozzle. The process is from ladle hoisting into place, nozzle inspection, and ladle hoisting away.

[0076] The ladle tilting table wireless positioning system of this embodiment is part of the tilting table electrical control system. It includes limit devices 1 (a total of 8, 4 in a group, one group is the trunnion unlocking signal and the other group is the trunnion locking signal) and signal receiving unit 2 installed in the control cabinet. The limit devices 1 are installed inside the trunnion pushing cylinder 402 on the tilting table, and the signal receiving unit 2 is installed in the control cabinet.

[0077] At the start of the work process, the overhead crane hoists the ladle for maintenance onto the tilting platform, places the ladle lifting ring in the trunnion locking position on the tilting platform, and begins the maintenance work. The tilting platform is set to a 90-degree tilt angle. After triggering the forward rotation command, the control cabinet sends trunnion locking and locking pin removal commands to the tilting platform, and the platform begins operation. The tilting platform has four trunnions 401 and four trunnion-driven cylinders 402. The trunnions 401 are locked by the trunnion-driven cylinders 402. When the trunnion-driven cylinders 402 are pushed out (locked), they strike the stop handle 108 of the limit device 1 (locked). The stop handle 108 actuates, causing the permanent magnet to approach the reed switch sensing area. The signal sensing module 102 receives the signal and transmits it to the signal processing module 103. The signal processing module 103 modulates and encodes the signal before transmitting it to the signal transmitting module 104. Finally, the position signal of the limit device 1 is transmitted via the communication antenna 105.

[0078] The signal receiving unit 2 includes a signal receiving antenna 202, a signal conversion module 203, a delay module 204, and a control relay 205. The signal receiving unit 2 receives the signal emitted by the communication antenna 105 through the signal receiving antenna 202, demodulates and encodes it through the signal conversion module 203, sends it to the delay module 204, locks the signal, and then transmits it to the control relay 205. Simultaneously, the photosensitive switch 405 receives a signal, the trunnion of the tilting table is locked, and a control signal is sent to the forward contactor. The forward contactor engages, and during the tilting table's rotation to 60 degrees, the encoder synchronously outputs a tilting table position signal. When the tilting table position signal outputs 60 degrees, the tilting table stops rotating and brakes; the replacement operation of the ladle sliding nozzle begins.

[0079] After the replacement of the ladle sliding gate is completed, the tilting table selects a tilt angle of 0 degrees and triggers a reverse command. The reverse contactor engages, and as the tilting table rotates to 0 degrees, the encoder synchronously outputs the tilting table position signal. When the tilting table position signal output signal is 0 degrees, the tilting table stops rotating and brakes. After the tilting table returns to 0 degrees, the control cabinet sends a locking pin insertion and trunnion unlocking command to the tilting table. The trunnion 401 pushes the cylinder 402 to unlock. When the trunnion pushes the cylinder 402 to retract (unlock), it strikes the strike handle 108 of the limit device 1 (unlock). The strike handle 108 moves the permanent magnet close to the reed switch sensing area. The signal sensing module 102 receives the signal and transmits it to the signal processing module 103. The signal processing module 103 modulates and encodes the signal and transmits it to the signal transmitting module 104. Finally, the position signal of the limit device 1 is sent through the communication antenna 105.

[0080] Signal receiving unit 2 receives the signal emitted by communication antenna 105 through signal receiving antenna 202, demodulates and encodes it through signal conversion module 203, sends it to delay module 204 and locks the signal, and then transmits it to control relay 205. When photosensitive switch 405 has no signal, the tilting table trunnion is unlocked and a lifting permission signal is sent, thus ending this maintenance operation.

[0081] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A wireless limit positioning system for a ladle tilting table, characterized in that, include: A limiting device is located inside the trunnion pushing cylinder. The limiting device generates a limiting signal by the striking action of the trunnion pushing cylinder. The limiting device includes a limiting housing and a signal sensing module, a signal processing module, a signal transmitting module, and a communication antenna disposed within the limiting housing and connected sequentially in order of signal transmission. The signal sensing module is a combination of a reed switch and a permanent magnet, or a combination of a spring, a striker, and a striker block; The trunnion pushes the cylinder to lock. When the trunnion pushes the cylinder out, it strikes the limit device's handle. The handle's action causes the permanent magnet to approach the reed switch's sensing area. The signal sensing module receives the signal and transmits it to the signal processing module. The signal processing module modulates and encodes the signal and transmits it to the signal transmitting module. Finally, the position signal of the limit device is sent through the communication antenna. A signal receiving unit is used to receive the limit signal from the limiting device and output a control signal; The drive unit is used to receive control signals from the signal receiving unit and control the tilt table to rotate to a set angle.

2. The wireless limit positioning system for a ladle tilting table according to claim 1, characterized in that: The trunnion pushes the cylinder outward, and the limiting device generates a locking limit signal; the trunnion pushes the cylinder inward, and the limiting device generates an opening limit signal.

3. The wireless limit positioning system for a ladle tilting table according to claim 1, characterized in that: The limiting housing is equipped with a power supply battery.

4. The wireless limit positioning system for a ladle tilting table according to claim 1, characterized in that: The signal receiving unit includes a base and a signal receiving antenna, a signal conversion module, a delay module, and a control relay disposed on the base and connected in sequence according to the signal; The signal receiving antenna and the communication antenna are connected wirelessly.

5. The wireless limit positioning system for a ladle tilting table according to claim 4, characterized in that: The drive unit is a motor; The motor is equipped with an encoder.

6. A wireless limit positioning control method for a ladle tilting table, characterized in that: The forward and reverse rotation control of the ladle tilting table is achieved by using the wireless limit positioning system for the ladle tilting table as described in any one of claims 4-5. The forward rotation control includes the following steps: S1. The crane hoists the ladle and places it on the tilting platform. The operator selects a tilting angle of 120 degrees. After the operator's forward rotation command is triggered, the control cabinet sends a command to the tilting platform to lock the trunnion and to move the locking pin, and the tilting platform starts to operate. S2. When the locking pin is in the push position, the trunnion reaches the locking position, the photosensitive switch on the trunnion generates a signal, the delay module closes and sends a trunnion locking limit signal to the signal receiving unit at a preset time. S3. The signal receiving unit receives the limit signal, the delay module locks the limit signal, the trunnion locks the limit conduction, and sends a control signal to the contactor that executes the forward rotation command. S4. The motor drives the tilting table to rotate to 120 degrees, the encoder outputs a signal, and the tilting table stops rotating; The inversion control includes the following steps: A. When the tilt angle is selected as 0 degrees, the tilt table starts to operate after the operator's reverse command is triggered. B. When the motor drives the tilting table to rotate to 0 degrees, the encoder outputs a signal, and the tilting table stops rotating. C. After the tilting table returns to the zero position, the trunnion opens. When the trunnion reaches the open position, the photosensitive switch on the trunnion does not generate a signal. The delay module closes and sends a trunnion opening limit signal to the signal receiving unit according to a preset time. D. The signal receiving unit receives the limit signal, the delay module locks the limit signal, the trunnion opens and the limit is turned on, an insertion command is sent to the locking pin, the delay module closes and sends the trunnion opening limit signal to the signal receiving unit at a preset time; E. Send a signal to allow lifting; the indicator light will illuminate.

7. The control method according to claim 6, characterized in that, Both the forward rotation control and the reverse rotation control also include a control stop step, specifically: When the stop button on the operator is triggered, the operator sends a stop rotation command to the tilting table, the stop relay closes, and the tilting table stops rotating.

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