Control system for aluminum electrolysis multifunctional crown block

Abstract

A control system for an aluminum electrolysis multifunctional crown block relates to the technical field of crown block control and comprises a remote controller, a remote control signal receiver, a PLC master station, a switch, a first wireless transceiver, a second wireless transceiver and a PLC slave station. The remote controller is in signal connection with the remote control signal receiver, the remote control signal receiver is in signal connection with the PLC master station, the PLC master station is in signal connection with the first wireless transceiver through the switch, the first wireless transceiver is in signal connection with the second wireless transceiver, and the second wireless transceiver is in signal connection with the PLC slave station. And the control system can realize stable transmission of control signals between the PLC master station and the PLC slave station in the aluminum electrolysis workshop, and is convenient for workers to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of overhead crane control, in particular to a control system for a multifunctional overhead crane for aluminum electrolysis. Background Art

[0002] The overhead crane is the main equipment in the aluminum electrolysis workshop. It is mainly responsible for shelling, slag removal, adding electrodes and loading materials during the anode replacement process in the aluminum electrolysis workshop. Its technical performance indicators will have a significant impact on production.

[0003] However, due to the special features of multi-functional overhead cranes, including complex tool cart mechanisms, multiple functions, and numerous electrical components, workers are prone to errors when operating the cranes by manipulating buttons, joysticks, and other control components, which in turn affects the safety of overhead crane operations.

[0004] In addition, the PLC system of the multifunctional overhead crane needs to consist of two PLC stations. One PLC station is located in the electrical room of the beam and serves as the master station of the PLC system. The other PLC station is located in the power distribution cabinet of the tool vehicle and serves as the slave station of the PLC system. The CPU of the PLC system is arranged in the master station. The master station and the slave station exchange data information through Ethernet communication connection.

[0005] Traditionally, the master station and slave stations are connected via a 60m long Category 5e double-shielded network cable to achieve Ethernet communication between the PLC system master station and slave stations. However, since the PLC slave station needs to be installed on the body of the tool cart, and the body of the tool cart needs to be frequently moved back and forth during use to perform production operations, the network cable connecting the master station and slave stations needs to be arranged on the cable pulley of the tool cart, which moves back and forth with the tool cart. During use, the network cable will fold back and forth due to the forward and backward movement of the tool cart, resulting in frequent breakage and damage of the network cable after folding, or the internal conductor will break, but the outer sheathing layer will be intact. This will cause the multi-functional overhead crane PLC system station communication to be lost, and the equipment will not be able to operate. Troubleshooting and replacing the network cable consumes a lot of man-hours, seriously affecting the reliability and effective operation time of the overhead crane.

[0006] Therefore, we propose a control system that can achieve stable transmission of control signals between the PLC master station and the PLC slave station in the aluminum electrolysis workshop and is convenient for workers to operate. Utility Model Content

[0007] In order to overcome the deficiencies in the background technology, the utility model discloses a control system for an aluminum electrolysis multifunctional overhead crane.

[0008] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

[0009] A control system for an aluminum electrolysis multifunctional overhead crane includes a remote control, a remote control signal receiver, a PLC master station, a switch, a first wireless transceiver, a second wireless transceiver, and a PLC slave station; the remote control is signal-connected to the remote control signal receiver, the remote control signal receiver is signal-connected to the PLC master station, the PLC master station is signal-connected to the first wireless transceiver via the switch, the first wireless transceiver is signal-connected to the second wireless transceiver, and the second wireless transceiver is signal-connected to the PLC slave station.

[0010] Preferably, the first wireless transceiver and the second wireless transceiver both include an antenna group, a wireless receiving circuit and a wireless transmitting circuit. The antenna group is used to send and receive wireless signals, and the signal ends of the antenna group are electrically connected to the wireless receiving circuit and the wireless transmitting circuit respectively.

[0011] Preferably, the wireless receiving circuit includes a low-noise amplifier, a mixer, an intermediate frequency amplifier, a demodulation unit and a filter electrically connected in sequence; wherein the low-noise amplifier is used to amplify the weak signal received by the receiving antenna group after noise reduction;

[0012] The mixer is used to convert the amplified signal into an intermediate frequency signal;

[0013] The intermediate frequency amplifier is used to amplify the intermediate frequency signal;

[0014] The demodulation unit is used to extract original data from the intermediate frequency signal;

[0015] The filter is used to purify the raw data and output it to the PLC slave station.

[0016] Preferably, the wireless transmission circuit comprises an oscillator, a modulation unit and a power amplifier electrically connected in sequence; wherein the oscillator is used to generate a wireless frequency signal;

[0017] The modulation unit is used to embed the data sent by the PLC master station into the wireless frequency signal;

[0018] The power amplifier is used to amplify the radio frequency signal containing data and transmit the signal to the antenna group.

[0019] Preferably, the PLC master station is electrically connected to the actuator via a relay, and the actuator is signal-connected to the PLC master station.

[0020] Preferably, the input end of the switch is electrically connected to a variable frequency speed regulating device, and the variable frequency speed regulating device is electrically connected to a remote control signal receiver.

[0021] Preferably, the signal output end of the PLC slave station is electrically connected to an amplifier, the amplifier is electrically connected to the signal receiving end of the hydraulic system, and the hydraulic system is driven and connected to the actuator; the actuator is electrically connected to a sensor, and the sensor is signal-connected to the PLC slave station.

[0022] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0023] The utility model discloses a control system for an aluminum electrolysis multifunctional overhead crane. Through a remote controller and a remote control signal receiver, a worker can remotely control the remote controller to realize the movement of the overhead crane, effectively reducing the complexity of operating the overhead crane. The remote control is also safer and has a better field of view.

[0024] In addition, the use of wireless connection between the PLC master station and the PLC slave station can also effectively avoid the disadvantages of wired connection and improve the freedom of PLC slave station installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A structural diagram of the utility model;

[0026] Figure 2 This is another structural schematic diagram of the utility model;

[0027] Figure 3 Schematic diagram of the structure of the wireless transceiver.

[0028] In the figure: 1. remote control; 2. remote control signal receiver; 3. PLC master station; 4. switch; 5. first wireless transceiver; 6. second wireless transceiver; 7. PLC slave station; 8. antenna group; 9. wireless receiving circuit; 91. low noise amplifier; 92. mixer; 93. intermediate frequency amplifier; 94. demodulation unit; 95. filter; 10. wireless transmitting circuit; 101. oscillator; 102. modulation unit; 103. power amplifier; 11. relay; 12. actuator; 13. variable frequency speed regulation device; 14. amplifier; 15. hydraulic system; 16. actuator; 17. sensor. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" and the like indicating directions or positional relationships, these are merely corresponding to the drawings of the present invention and are for the convenience of describing the present invention. They do not indicate or imply that the devices or components referred to must have a specific direction.

[0030] Example 1 is:

[0031] Combined with attachment Figure 1-3The control system for a multifunctional overhead crane for aluminum electrolysis comprises a remote controller 1, a remote control signal receiver 2, a PLC master station 3, a switch 4, a first wireless transceiver 5, a second wireless transceiver 6, and a PLC slave station 7. The remote controller 1 is signal-connected to the remote control signal receiver 2, which is in turn signal-connected to the PLC master station 3. Through the remote controller 1 and the remote control signal receiver 2, workers can remotely control the remote controller 1 to achieve the movement of the overhead crane, effectively reducing the complexity of operating the overhead crane. Remote control also allows workers to control the movement of the overhead crane from a distance, thereby improving worker safety and providing a better field of view.

[0032] In addition, the remote control 1 and the remote control signal receiver 2 are connected via infrared signals, while the wireless signal receiver and the PLC master station 3 are connected via a device network.

[0033] The PLC master station 3 is connected to the first wireless transceiver 5 via the switch 4, the first wireless transceiver 5 is connected to the second wireless transceiver 6, and the second wireless transceiver 6 is connected to the PLC slave station 7. In addition, the wireless connection between the PLC master station 3 and the PLC slave station 7 can also effectively avoid the disadvantages of wired connection and improve the installation freedom of the PLC slave station 7.

[0034] In addition, the connections between the PLC master station 3 and the switch 4 , the connections between the switch 4 and the first wireless transceiver 5 , and the connections between the second wireless transceiver 6 and the PLC slave station 7 are all Ethernet wired connections.

[0035] Example 2 is:

[0036] Based on Example 1, the first and second wireless transceivers are further defined, wherein the first wireless transceiver 5 and the second wireless transceiver 6 have the same structure, and both wireless transceivers include an antenna group 8, a wireless receiving circuit 9, and a wireless transmitting circuit 10. The antenna group 8 is used to send and receive wireless signals, and the signal end of the antenna group 8 is electrically connected to the wireless receiving circuit 9 and the wireless transmitting circuit 10, respectively.

[0037] In addition, the wireless receiving circuit 9 includes a low-noise amplifier 91, a mixer 92, an intermediate frequency amplifier 93, a demodulation unit 94, and a filter 95, which are electrically connected in sequence. The low-noise amplifier 91 is used to amplify the weak signal received by the receiving antenna group 8 after noise reduction to ensure signal quality. In addition, the design of the low-noise amplifier 91 generally requires attention to gain and noise figure to improve the signal-to-noise ratio of the signal.

[0038] The mixer 92 is used to convert the amplified signal into an intermediate frequency signal, wherein the mixer 92 mixes the received wireless signal with the signal generated by the local oscillator 101 in the mixer to generate an intermediate frequency signal. The working principle of the mixer 92 is to add and subtract the two signal frequencies through a nonlinear process to obtain a new frequency component, that is, the intermediate frequency signal;

[0039] The intermediate frequency amplifier 93 is used to amplify the intermediate frequency signal, further improve the signal strength, reduce noise, and make the amplified signal more suitable for subsequent demodulation processing;

[0040] The demodulation unit 94 is used to extract the original data from the intermediate frequency signal. It should be noted that the intermediate frequency signal can be demodulated using an envelope detector, and the demodulated modulated signal is then demodulated using a phase-locked loop. The demodulated signal can restore the original information content;

[0041] The filter 95 is used to purify the original data, specifically to remove noise and unnecessary frequency components in the original data signal to keep the signal pure; the original data is finally output to the PLC slave station 7.

[0042] As needed, the wireless transmission circuit 10 includes an oscillator 101, a modulation unit 102, and a power amplifier 103 electrically connected in sequence; wherein the oscillator 101 is used to generate a wireless frequency signal, i.e., a carrier signal, and the oscillator 101 is generally a crystal oscillator or an LC oscillator. The crystal oscillator uses the resonance characteristics of the crystal to generate a very stable frequency and is suitable for applications requiring high stability; the LC oscillator adjusts the frequency through a combination of inductance and capacitance, and has a more flexible design.

[0043] The modulation unit 102 is used to embed the data sent by the PLC master station 3 into a wireless frequency signal. The modulation methods include amplitude modulation AM and frequency modulation FM. AM transmits information by changing the amplitude of the carrier signal, while FM transmits information by changing the frequency of the carrier. The modulated signal carries the data content and can be demodulated by the receiver.

[0044] The power amplifier 103 is used to amplify the wireless frequency signal containing data and transmit the signal to the antenna group 8. The amplified wireless frequency signal can be effectively transmitted through the wireless channel, thereby improving the transmission distance and effectiveness of the signal. The power amplifier 103 is generally a MOSFET or BJT, and the output power and gain need to be considered during design.

[0045] Example 3 is:

[0046] On the basis of Example 1, the control of the PLC master station 3 and the PLC slave station 7 is further defined as follows:

[0047] That is, the PLC master station 3 is electrically connected to the actuator 12 through the relay 11, and the actuator 12 is signal-connected to the PLC master station 3. The PLC master station 3 controls the action of the relay 11 to thereby control the actuator 12. In addition, the actuator 12 can send a feedback signal to the PLC master station 3, so that the PLC master station 3 can obtain the action result of the actuator 12, determine whether the instruction sent by itself is executed, and complete the self-inspection of the overhead crane operation.

[0048] In addition, the input end of the switch 4 is electrically connected to a variable frequency speed regulating device 13, which is electrically connected to the remote control signal receiver 2. The variable frequency speed regulating device 13 can receive the speed change signal of the remote control signal receiver 2 and send it to the switch 4, and finally transmit it to the PLC slave station 7 through the first wireless transceiver 5 and the second wireless transceiver 6.

[0049] As needed, the signal output end of the PLC slave station 7 is electrically connected to an amplifier 14, the amplifier 14 is electrically connected to the signal receiving end of the hydraulic system 15, and the hydraulic system 15 is drive-connected to the actuator 16; the actuator 16 is electrically connected to a sensor 17, and the sensor 17 is signal-connected to the PLC slave station 7. The sensor 17 is used to feedback the working status of the actuator 16 to the PLC slave station 7, such as whether the actuator 16 has run into place, whether it has run too far, or whether the operation will affect the staff. The PLC slave station 7 will also send the feedback status signal back to the PLC master station 3, and the CPU of the PLC master station 3 will determine whether the action of the actuator 16 is normal. If the action of the actuator 16 fails or has a safety hazard, it will be shut down in time to prevent accidents.

[0050] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

Claims

1. A control system for an aluminum electrolysis multifunctional overhead crane, characterized by: The invention comprises a remote controller (1), a remote control signal receiver (2), a PLC master station (3), a switch (4), a first wireless transceiver (5), a second wireless transceiver (6) and a PLC slave station (7); the remote controller (1) is signal-connected to the remote control signal receiver (2), the remote control signal receiver (2) is signal-connected to the PLC master station (3), the PLC master station (3) is signal-connected to the first wireless transceiver (5) via the switch (4), the first wireless transceiver (5) is signal-connected to the second wireless transceiver (6), and the second wireless transceiver (6) is signal-connected to the PLC slave station (7).

2. The control system for the aluminum electrolysis multifunctional overhead crane according to claim 1, characterized in that: The first wireless transceiver (5) and the second wireless transceiver (6) both comprise an antenna group (8), a wireless receiving circuit (9) and a wireless transmitting circuit (10); the antenna group (8) is used to transmit and receive wireless signals; and the signal end of the antenna group (8) is electrically connected to the wireless receiving circuit (9) and the wireless transmitting circuit (10), respectively.

3. The control system for the aluminum electrolysis multifunctional overhead crane according to claim 2, characterized in that: The wireless receiving circuit (9) comprises a low-noise amplifier (91), a mixer (92), an intermediate frequency amplifier (93), a demodulation unit (94) and a filter (95) which are electrically connected in sequence; wherein the low-noise amplifier (91) is used to reduce the noise of the weak signal received by the receiving antenna group (8) and amplify it; the mixer (92) is used to convert the amplified signal into an intermediate frequency signal; the intermediate frequency amplifier (93) is used to amplify the intermediate frequency signal; the demodulation unit (94) is used to extract original data from the intermediate frequency signal; and the filter (95) is used to purify the original data and output it to the PLC slave station (7).

4. The control system for the aluminum electrolysis multifunctional overhead crane according to claim 2, characterized in that: The wireless transmission circuit (10) comprises an oscillator (101), a modulation unit (102) and a power amplifier (103) which are electrically connected in sequence; wherein the oscillator (101) is used to generate a wireless frequency signal; the modulation unit (102) is used to add data sent by the PLC master station (3) to the wireless frequency signal; and the power amplifier (103) is used to amplify the wireless frequency signal containing the data and transmit the signal to the antenna group (8).

5. The control system for the aluminum electrolysis multifunctional overhead crane according to claim 1, characterized in that: The PLC master station (3) is electrically connected to an actuator (12) via a relay (11), and the actuator (12) is signal-connected to the PLC master station (3).

6. The control system for the aluminum electrolysis multifunctional overhead crane according to claim 1, characterized in that: The input end of the switch (4) is electrically connected to a variable frequency speed regulating device (13), and the variable frequency speed regulating device (13) is electrically connected to a remote control signal receiver (2).

7. The control system for the aluminum electrolysis multifunctional overhead crane according to claim 1, characterized in that: The signal output end of the PLC slave station (7) is electrically connected to an amplifier (14), the amplifier (14) is electrically connected to a signal receiving end of a hydraulic system (15), the hydraulic system (15) is drive-connected to an actuator (16); the actuator (16) is electrically connected to a sensor (17), and the sensor (17) is signal-connected to the PLC slave station (7).

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