CN218940981U - Electric accident switching device for buggy ladle - Google Patents
Electric accident switching device for buggy ladle Download PDFInfo
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- CN218940981U CN218940981U CN202222972043.9U CN202222972043U CN218940981U CN 218940981 U CN218940981 U CN 218940981U CN 202222972043 U CN202222972043 U CN 202222972043U CN 218940981 U CN218940981 U CN 218940981U
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- contactor
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- bypass
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- 238000006243 chemical reaction Methods 0.000 claims description 28
- 230000001012 protector Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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Abstract
The utility model relates to the field of automatic control of buggy ladle, in particular to a buggy ladle electric accident switching device. The device comprises a main loop and a control loop; the main loop comprises a variable frequency loop, an accident bypass and an accident switching contactor group; switching the variable frequency loop and the accident bypass by the accident switching contactor group; the control loop comprises a master switch control group, an emergency control relay and a forward and reverse rotation emergency button, and can provide different control modes according to different electrical faults of the frequency converter, the communication network or the PLC system, so that the ladle car can be ensured to continue to run. The device has the advantages of convenient operation and high reliability, improves the running continuity of the ladle car, and can effectively avoid production interruption and safety accidents caused by electric faults.
Description
Technical Field
The utility model relates to the field of automatic control of buggy ladle, in particular to a buggy ladle electric accident switching device.
Background
The ladle car has the main functions of carrying and transferring molten steel in a steelmaking workshop, and is one of important equipment in converter and refining production. Because of the requirements of process linkage and positioning control, the buggy ladle basically adopts a working mode of a PLC+frequency converter, namely, the PLC sends a control instruction to the frequency converter through a bus network to drive the buggy ladle to walk. Steelmaking production environment is abominable, and various electrical faults often occur in the buggy ladle: the frequency converter and the accessory components are damaged, the communication network is failed and the PLC system is electrically failed. The electric faults can lead to the failure of the buggy ladle to walk, cause the interruption of the production of a converter or refining, even safety accidents and serious economic loss.
Disclosure of Invention
In order to solve the problems, the utility model provides the electric accident switching device for the buggy ladle, which is used for effectively improving the running continuity of the buggy ladle, ensuring that molten steel is transported to a safe production area and avoiding safety accidents.
The technical scheme adopted for solving the technical problems is as follows:
the electric accident switching device of the buggy ladle comprises a main loop and a control loop; the main loop comprises a frequency conversion loop, an accident bypass and an accident switching contactor group; the accident switching contactor set comprises a first contactor and a second contactor; the first contactor is connected in series with the output end of the frequency converter in the frequency conversion loop, the second contactor is connected in series with the output end of the motor protector in the accident bypass, and the wire outlet ends of the first contactor and the second contactor are connected in parallel and connected to the buggy ladle motor; the first contactor and the second contactor are mechanically and electrically interlocked;
the control loop comprises a master switch control group, an emergency control relay and a forward and reverse rotation emergency button;
the master switch control group comprises a first master switch and a second master switch; the first master switch comprises three working positions, and the first position of the first master switch is connected with a coil of a frequency conversion loop incoming line contactor and a coil of the first contactor and is connected with a multipoint electric interlocking signal of a frequency conversion loop in series; the second position of the first master switch is a vacancy; the third position of the first master switch is connected with the coil of the second contactor and is connected with a multipoint electric interlocking protection signal of an accident bypass in series; the second master switch comprises two working positions, wherein a first position gap of the second master switch is connected with a coil of the emergency control relay in series; the normally closed auxiliary contact of the emergency control relay is connected with a forward and reverse rotation control signal sent by the PLC; the normally open auxiliary contact of the emergency control relay is connected with a forward and reverse rotation emergency button; the forward and reverse rotation emergency button comprises a forward rotation emergency button and a reverse rotation emergency button; the forward rotation emergency button and the forward rotation control signal are connected with a coil of a forward rotation contactor in series, and the forward rotation operation electric interlocking signal and the accident bypass allowable interlocking signal are connected; the reversing emergency button and the reversing control signal are connected in series with the coil of the reversing contactor to reverse the operation electric interlocking signal and the accident bypass permission interlocking signal.
Further, the frequency conversion loop includes: switch fuse group, inlet wire contactor and converter.
Further, the accident bypass includes: a circuit breaker, a positive and negative switching contact set and a motor protector.
Further, the multipoint electric interlocking signal of the frequency conversion loop comprises a normally closed auxiliary contact of a second contactor connected in series, a normally closed contact of a forward switching contactor, a normally closed contact of a reverse switching contactor and a normal signal of the frequency conversion loop, wherein the normal signal of the frequency conversion loop is a comprehensive signal of normal operation of the frequency converter and switching on of a switch fuse set.
Further, the multipoint electric interlocking protection signal of the accident bypass comprises a normally closed auxiliary contact of the first contactor, a normally closed auxiliary contact of the frequency converter operation relay and an accident bypass main loop normal signal which is a comprehensive signal of normal operation of the circuit breaker closing and the motor protector.
Further, the forward running electric interlocking signal comprises a normally closed contact of the reverse contactor and a ladle car forward limit signal; the reverse running electric interlocking signal comprises a normally closed contact of the forward switching contactor and a buggy ladle backward limit signal.
Further, the accident bypass enable interlock signal comprises a scram signal and a normally open auxiliary contact of the second contactor.
The utility model realizes the following technical effects:
the utility model has the advantages of convenient operation and high reliability. Aiming at different electrical faults of a frequency converter, a communication network or a PLC system, the device can provide different control modes, ensure that the buggy ladle continues to operate, improve the continuity of buggy ladle operation, and effectively avoid production interruption and safety accidents caused by the electrical faults.
Drawings
FIG. 1 is a schematic diagram of a main circuit of a buggy ladle electrical accident switching apparatus of the present utility model;
fig. 2 is a schematic diagram of a control loop of the electric accident switching device of the buggy ladle.
Detailed Description
For further illustration of the various embodiments, the utility model is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present utility model.
The utility model will now be further described with reference to the drawings and detailed description.
The utility model provides a buggy ladle electrical accident switching device, wherein the circuit schematic diagram of a main loop is shown in fig. 1, and the schematic diagram of a control loop is shown in fig. 2.
In this embodiment, the main loop is composed of a variable frequency loop, an accident bypass, an accident switching contactor set, and the like.
The frequency conversion loop comprises a switch fuse set Q11, an incoming line contactor KM11 and a frequency converter U11; the accident bypass comprises a breaker Q21, forward and reverse contactor sets KM21, KM22 and a motor protector U21. Switching of the variable frequency loop and the accident bypass is completed through the accident switching contactor set.
The accident switching contactor set includes an accident switching first contactor KM12 and an accident switching second contactor KM23. The accident switching first contactor KM12 is connected in series with the output end of the frequency converter U11, the accident switching second contactor KM23 is connected in series with the output end of the motor protector U21, and the outlet sides of the two contactors are connected in parallel and connected to the buggy ladle motor. To ensure electrical safety, the two contactors are mechanically and electrically interlocked, ensuring that in any case only one main circuit works.
In this embodiment, the control loop is composed of a master switch control group, an emergency control relay, a forward/reverse rotation emergency button, and the like.
The master switch control group comprises a first master switch S101 and a second master switch S102, and the switching of the variable frequency loop and the accident bypass is performed by switching the master switch control group.
The first bit of the first master switch S101 activates the variable frequency loop. The first position of the first master switch S101 is connected with a coil of a frequency conversion loop incoming line contactor KM11 and a coil of an accident switching first contactor KM12, and then is connected with a multipoint electric interlocking protection signal of the frequency conversion loop in series. The multipoint electric interlocking protection signal of the frequency conversion loop comprises normally closed auxiliary contacts of the accident switching second contactor KM23 which are connected in series, normally closed contacts of the accident bypass forward and reverse rotation contactors KM21 and KM22 and a normal signal K102 of the frequency conversion loop. Normally closed auxiliary contacts of the contactors KM21, KM22 and KM23 are connected in series to form an electric safety chain. If any one of the three contactors is powered on, the variable frequency loop cannot be activated, so that the variable frequency loop cannot be switched to in an electrified manner when the accident bypass is switched on and the accident bypass is operated, and the electric safety when the main loop is switched is realized. The normal signal K102 of the frequency conversion circuit is a comprehensive signal of normal operation of the frequency converter U11 and closing of the switch fuse set Q11, and the interlocking signal ensures that the frequency conversion circuit can be effectively switched to the frequency conversion circuit under the condition that the frequency conversion circuit is electrically normal. The second position of the first master switch S101 is in a vacant position, zero signal protection is carried out, and the output of the main loop is cut off. The third bit of the first master switch S101 may activate the accident bypass. The third position of the first master switch S101 is connected with the coil of the accident switching second contactor KM23, and then is connected with the accident bypass multipoint electric interlocking protection signal in series. The accident bypass multipoint electric interlocking protection signal comprises a normally closed auxiliary contact of the accident switching first contactor KM12, a normally closed auxiliary contact of a frequency converter operation relay K101 and an accident bypass main loop normal signal K103 which are connected in series. The normally closed auxiliary contact of the contactor KM12 is connected in series with the normally closed auxiliary contact of the frequency converter operation relay K101 to form an electric safety chain, so that the frequency conversion loop is connected and the frequency converter cannot be switched to an accident bypass when in operation, and the electric safety is ensured when the accident bypass is switched. The accident bypass main circuit electrical normal signal K103 is a comprehensive signal of the closing of the breaker Q21 and the normal operation of the motor protector U21, and the signal linkage ensures that the accident bypass can be effectively switched to under the condition of the normal accident bypass electrical.
And a first position of a second master switch S102 in the control loop is in a vacant position, and a second position of the second master switch S102 is connected with a coil of an emergency control relay K104 in series. The normally closed auxiliary contact of the emergency control relay K104 is connected with PLC forward and reverse rotation control signals K105 and K106; the normally open auxiliary contact of the emergency control relay K104 is connected with the forward and reverse emergency buttons S103 and S104. The two control signals are electrically mutually exclusive, and only one control state is ensured to be valid in any situation. When the second master switch S102 selects the first position, the coil of the emergency control relay K104 is powered off, and the normally closed auxiliary contact is connected with the PLC forward and reverse rotation control signal. When the second master switch S102 selects the second position, the coil of the emergency control relay K104 is electrified, and the normally open contact is closed to switch on the forward and reverse rotation emergency button.
The positive and negative rotation control signals K105 and K106 of the PLC are control commands sent by the PLC according to the process production requirements. The forward rotation control signal K105 is connected with a coil of the forward rotation contactor KM21 in series, and is an electric interlock signal and an accident bypass permission interlock signal of forward movement; the reversing control signal K106 is connected with the coil of the reversing contactor KM22 in series, and is used for reversing the operation electric interlocking signal and the accident bypass allowable interlocking signal; under the condition that the electric interlocking and accident bypass allow interlocking signals to be met, after the PLC control K105 is closed, the forward switching contactor KM21 is powered on, and the ladle car is driven to run forward; after the PLC controls the K106 to be closed, the reversing contactor KM22 is powered on, and the ladle car is driven to reversely run.
The forward and reverse rotation emergency buttons S103 and S104 are arranged on the field operation box, so that the operation is convenient. The forward rotation emergency button S103 is connected with a coil of the bypass forward switching contactor KM21 in series, and is used for electrically interlocking signals of forward transport operation and accident bypass allowing interlocking signals; the reversing emergency button S104 serially reverses the coil of the contactor KM22, reverses the run electrical interlock signal and the accident bypass enable interlock signal. Under the condition that the electric interlocking signal and the accident bypass allow the interlocking signal to be met, an operator does not depend on a frequency converter, a communication network and a PLC system when controlling the buggy ladle to run, and can control the buggy ladle to advance and retreat by pressing a forward and reverse button on an operation box.
The forward running electric interlocking signal comprises a normally closed contact of a reverse contactor KM22 and a ladle car forward limit signal K107; the reverse running electric interlocking signal comprises a normally closed contact of a forward contact contactor KM21 and a buggy ladle backward limit signal K108; the coil of the positive and negative rotation contactor and the auxiliary contact are mutually exclusive in electric signals, so that the two contactors are not electrified at the same time, and electric protection is formed. The forward limit signal K107 and the reverse limit signal K108 ensure that the ladle car is operated in a safe travel region.
The accident bypass allowable interlock signal includes the emergency stop signal K109 and the normally open auxiliary contact of the accident switching second contactor KM23. The emergency stop signal K109 is a comprehensive signal of a buggy ladle emergency stop button and an emergency stop of a process system, and ensures that an accident bypasses emergency stops in an emergency situation. The normally open auxiliary contact of the KM23 can be closed only when the first master switch S101 is in the third position and the coil of the KM23 contactor is electrified, so that the control of the accident bypass is ensured to be activated when the first master switch S101 is in the third position.
Under normal conditions, the ladle car runs under the variable frequency loop, the first master switch S101 is in the first position, the second master switch S102 is in the first position, and the PLC controls the frequency converter to drive the ladle car to run through the bus network. When the frequency conversion system or bus communication of the buggy ladle breaks down, the first master switch S101 is switched to the third position to start the buggy ladle accident bypass, at the moment, the command of the PLC can control the accident bypass forward and reverse contactors KM21 and KM22 to drive the buggy ladle to run, production is kept continuous, and meanwhile, the electrical faults of the frequency conversion system or the communication network can be repaired manually. When the PLC system also fails, the first master switch S101 is kept at the third position, the second master switch S102 is switched to the second position, at the moment, the forward and reverse rotation emergency buttons S103 and S104 on the operation box can control the vehicle to run, the buggy ladle is run to the ladle lifting position to carry out lifting of the next procedure, safety accidents are avoided, and the continuous running of the next production procedure is ensured.
While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (7)
1. The electric accident switching device for the buggy ladle is characterized by comprising a main loop and a control loop;
the main loop comprises a frequency conversion loop, an accident bypass and an accident switching contactor group; the accident switching contactor set comprises a first contactor and a second contactor; the first contactor is connected in series with the output end of the frequency converter in the frequency conversion loop, the second contactor is connected in series with the output end of the motor protector in the accident bypass, and the wire outlet ends of the first contactor and the second contactor are connected in parallel and connected to the buggy ladle motor; the first contactor and the second contactor are mechanically and electrically interlocked;
the control loop comprises a master switch control group, an emergency control relay and a forward and reverse rotation emergency button;
the master switch control group comprises a first master switch and a second master switch; the first master switch comprises three working positions, and the first position of the first master switch is connected with a coil of a frequency conversion loop incoming line contactor and a coil of the first contactor and is connected with a multipoint electric interlocking signal of a frequency conversion loop in series; the second position of the first master switch is a vacancy; the third position of the first master switch is connected with the coil of the second contactor and is connected with a multipoint electric interlocking protection signal of an accident bypass in series; the second master switch comprises two working positions, wherein a first position gap of the second master switch is connected with a coil of the emergency control relay in series; the normally closed auxiliary contact of the emergency control relay is connected with a forward and reverse rotation control signal sent by the PLC; the normally open auxiliary contact of the emergency control relay is connected with a forward and reverse rotation emergency button; the forward and reverse rotation emergency button comprises a forward rotation emergency button and a reverse rotation emergency button; the forward rotation emergency button and the forward rotation control signal are connected with a coil of a forward rotation contactor in series, and the forward rotation operation electric interlocking signal and the accident bypass allowable interlocking signal are connected; the reversing emergency button and the reversing control signal are connected in series with the coil of the reversing contactor to reverse the operation electric interlocking signal and the accident bypass permission interlocking signal.
2. The buggy ladle electrical accident switching apparatus according to claim 1, wherein the frequency conversion circuit comprises: switch fuse group, inlet wire contactor and converter.
3. The buggy ladle electrical accident switching apparatus according to claim 1, wherein the accident bypass comprises: a circuit breaker, a positive and negative switching contact set and a motor protector.
4. The buggy ladle electrical accident switching apparatus of claim 1, wherein the multi-point electrical interlock signal of the frequency conversion circuit comprises a normally closed auxiliary contact of the second contactor connected in series, a normally closed contact of the forward contactor, a normally closed contact of the reverse contactor and a normal signal of the frequency conversion circuit, wherein the normal signal of the frequency conversion circuit is a comprehensive signal of normal operation of the frequency converter and closing of the switch fuse set.
5. The buggy ladle electrical accident switching apparatus of claim 1, wherein the multi-point electrical interlock protection signal of the accident bypass comprises a normally closed auxiliary contact of a first contactor, a normally closed auxiliary contact of a frequency converter operating relay and an accident bypass main loop normal signal which are connected in series, wherein the accident bypass main loop normal signal is a combined signal of a breaker closing and a motor protector operating normally.
6. The buggy ladle electrical accident switching apparatus of claim 1, wherein the forward travel electrical interlock signal comprises a normally closed contact of the reversing contactor and a buggy ladle forward limit signal; the reverse running electric interlocking signal comprises a normally closed contact of the forward switching contactor and a buggy ladle backward limit signal.
7. The buggy ladle electrical fault switching apparatus of claim 1, wherein the fault bypass enable interlock signal comprises a scram signal and a normally open auxiliary contact of the second contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222972043.9U CN218940981U (en) | 2022-11-08 | 2022-11-08 | Electric accident switching device for buggy ladle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222972043.9U CN218940981U (en) | 2022-11-08 | 2022-11-08 | Electric accident switching device for buggy ladle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218940981U true CN218940981U (en) | 2023-04-28 |
Family
ID=86092167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222972043.9U Active CN218940981U (en) | 2022-11-08 | 2022-11-08 | Electric accident switching device for buggy ladle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218940981U (en) |
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2022
- 2022-11-08 CN CN202222972043.9U patent/CN218940981U/en active Active
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