CN217789290U - Voltage monitoring device for frequency conversion and speed regulation electrical system of electric shovel and electric shovel - Google Patents
Voltage monitoring device for frequency conversion and speed regulation electrical system of electric shovel and electric shovel Download PDFInfo
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- CN217789290U CN217789290U CN202220648989.7U CN202220648989U CN217789290U CN 217789290 U CN217789290 U CN 217789290U CN 202220648989 U CN202220648989 U CN 202220648989U CN 217789290 U CN217789290 U CN 217789290U
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Abstract
The application provides a voltage monitoring device and electric shovel of electric shovel variable frequency speed governing electrical system, its voltage monitoring device includes the voltage monitoring protector, monitors the voltage output of the control power supply of electric shovel variable frequency speed governing electrical system through the voltage monitoring protector, can turn-off when the voltage value of control power supply surpasss and sets for the threshold value. The output at voltage monitoring protector is connected with the relay, can control whether the circuit between direct current voltage source and the indicating component breaks off through the relay, and when voltage monitoring protector turn-offs, the normally closed contact of relay is turn-offs, then the circuit between indicating component and the direct current voltage source is broken off, thereby indicating component can't obtain the power and the action can indicate the staff to control the voltage of power too high. Above scheme of this application can monitor the control circuit voltage of power shovel, sends the suggestion when control circuit voltage appears unusual undulant, but in time discovers and handles when the power shovel because voltage fluctuation shuts down.
Description
Technical Field
The application relates to the technical field of circuit design, in particular to a voltage monitoring device for a variable-frequency speed regulation electrical system of an electric shovel and the electric shovel.
Background
The WK series mining mechanical face shovel type excavator is large-scale strip mine mining and loading equipment developed by Taiyuan heavy industry, and a frequency conversion speed regulation electrical system of the excavator consists of an upper human-computer interface, a PLC field bus and an AFE (Active Front End) frequency conversion transmission. The upper human-computer interface monitors the running state of the whole machine, the running state simulation display and fault self-diagnosis are realized, and the PLC is connected with the AFE, the inverter and the cab control part through a field bus to realize distributed control. The AFE powers the entire electric shovel. The total control Power source of the above system is an 11KW UPS (Uninterruptible Power Supply), which rectifies 220V ac of the external grid into 210V dc to charge the battery pack through an isolation transformer, and then inverts the dc to 220V constant voltage. In the actual use process, due to the fact that the voltage of an external network is unstable, the power supply voltage value of the UPS fluctuates greatly, the maximum value often exceeds the protection setting value of the UPS, the UPS power supply jumper is in a bypass mode, the control voltage of the whole machine is unstable, once the situation occurs in the operation process, various control faults can occur to the electric shovel, the power supply voltage of a control system is ultrahigh, each control plate can overload and operate in an overvoltage mode, each controller is burnt out, and even the controller is subjected to high-temperature fire.
Therefore, a voltage monitoring device in an electric shovel control system is needed.
Disclosure of Invention
The technical problem that this application will be solved is that the power supply system voltage fluctuation among the current electric shovel lacks effectual monitoring device and warning suggestion to probably break down in the electric shovel operation process that the too high power supply system voltage leads to can appear, for this reason, this application has provided a voltage monitoring device and electric shovel for electric shovel variable frequency speed governing electric system.
In view of the above technical problems, the present application provides the following technical solutions:
the embodiment of the application provides an electric shovel Variable Frequency Speed Governing (VFSG) electrical system's voltage monitoring device includes:
the voltage monitoring protector is connected with a voltage output end of a control power supply of the electric shovel frequency-conversion speed-regulation electrical system, and is turned off when the voltage value of the control power supply exceeds a set threshold value;
the input end of the relay is connected with the output end of the voltage monitoring protector, the first end of a normally closed contact of the relay is connected with a direct-current voltage source, when the voltage monitoring protector is turned off, the relay loses power, and the normally closed contact is turned off;
and the indicating component is connected with the second end of the normally closed contact of the relay, and acts to indicate that the voltage of the control power supply is too high when the normally closed contact is turned off.
Optionally, in some embodiments, in the voltage monitoring apparatus of the electric shovel variable-frequency speed-regulating electrical system, the indicating component is an indicator light, and the indicator light is turned off when the normally-closed contact is turned off.
Optionally, in some embodiments, the dc voltage source is a preset dc voltage source in the electric shovel variable frequency speed regulation electrical system.
Optionally, in some embodiments, the relay comprises a normally open contact;
the PLC power line of the electric shovel variable frequency speed regulation electrical system is connected with the first end of the normally open contact, when the voltage monitoring protector is turned off, the normally open contact is opened, and the port of the PLC controller connected with the PLC power line is powered off.
Optionally, in some embodiments, the PLC controller is internally provided with a time delay unit, and the time delay unit is triggered by a power-off signal of a PLC controller port connected to the PLC power line;
and the PLC is shut down after the set time triggered by the time delay unit.
Optionally, in some embodiments, the voltage monitoring device of the electric shovel variable frequency speed regulation electrical system is a self-resetting overvoltage and undervoltage protector.
Optionally, in some embodiments, the self-resetting overvoltage and undervoltage protector is connected to the output low-voltage contactor of the control power supply.
Optionally, in the voltage monitoring apparatus of the electric shovel variable frequency speed regulating electrical system in some embodiments, the surfaces of the normally open contact and the normally closed contact of the relay are plated with silver material layers.
Optionally, in some embodiments, the voltage monitoring device of the electric shovel variable frequency speed control electrical system, the voltage monitoring protector and the relay are both disposed in a control cabinet of the electric shovel variable frequency speed control electrical system.
The embodiment of the application also provides the electric shovel, and the control power supply of the electric shovel is provided with the voltage monitoring device of the electric shovel frequency conversion speed regulation electric system.
Compared with the prior art, the technical scheme of the application has the following technical effects:
the application provides a shovel variable frequency speed control electrical system's voltage monitoring device and shovel, its voltage monitoring device includes the voltage monitoring protector, monitors the voltage output of shovel variable frequency speed control electrical system's control power supply through the voltage monitoring protector, can turn-off when the voltage value of control power supply surpasss the settlement threshold value. The output at voltage monitoring protector is connected with the relay, can control whether the circuit between direct current voltage source and the indicating component breaks off through the relay, and when voltage monitoring protector turn-offs, the normally closed contact of relay is turn-offs, then the circuit between indicating component and the direct current voltage source is broken off, thereby indicating component can't obtain the power and the action can indicate the staff to control the voltage of power too high. Above scheme of this application can monitor the control circuit voltage of power shovel, sends the suggestion when control circuit voltage appears unusual undulant, but in time discovers and handles when the power shovel because voltage fluctuation shuts down.
Drawings
The objects and advantages of this application will be appreciated by the following detailed description of the preferred embodiments thereof, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a voltage monitoring device of a variable frequency speed regulation electrical system of an electric shovel according to an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating the connection relationship between the indicating component and the normally closed contact of the relay and the DC voltage source according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a voltage monitoring device of an electric shovel frequency conversion and speed regulation electrical system according to another embodiment of the present application;
fig. 4 is a schematic diagram illustrating a connection relationship between a PLC power line, a normally open contact of a relay, and an input board of a PLC controller according to an embodiment of the present application.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
The embodiment provides a voltage monitoring device of an electric shovel frequency conversion speed regulation electric system, as shown in fig. 1 and fig. 2, the voltage monitoring device comprises a voltage monitoring protector U1, a relay KF1 and an indicating component HL1. The voltage monitoring protector U1 is connected with a voltage output end of a control power supply UPS of the electric shovel frequency conversion and speed regulation electrical system, and the voltage monitoring protector U1 is turned off when the voltage value of the control power supply UPS exceeds a set threshold value; the input end of the relay KF1 is connected with the output end of the voltage monitoring protector U1, the first end of the normally closed contact of the relay KF1 is connected with a direct-current voltage source, and when the voltage monitoring protector U1 is turned off, the relay KF1 loses power and the normally closed contact is turned off; the indicating component HL1 is connected with the second end of the normally closed contact of the relay KF1, and when the normally closed contact is turned off, the indicating component HL1 acts to indicate that the voltage of the control power supply UPS is too high.
According to the scheme, the voltage monitoring protector U1 is used for monitoring the voltage output of the control power supply UPS of the electric shovel variable-frequency speed regulation electrical system, and the control power supply UPS can be turned off when the voltage value of the control power supply UPS exceeds a set threshold value. Be connected with relay KF1 at voltage monitoring protector U1's output, whether can control the circuit between direct current voltage source and the instruction component HL1 through relay KF1 and break off, when voltage monitoring protector U1 turn-offs, relay KF 1's normally closed contact is turn-offs, then instructs the circuit between component HL1 and the direct current voltage source to be broken off, thereby instruction component HL1 can't obtain the power and the action can indicate that the voltage of staff control power is too high. Above scheme can monitor the control circuit voltage of electric shovel, sends the suggestion when control circuit voltage appears the unusual fluctuation, but in time discovers and handles when the electric shovel is shut down because of voltage fluctuation.
In some aspects, the indicator HL1 can be an indicator light, such as a 24DC DN16-22FS alarm indicator light. The indicator lights are illuminated when powered and are extinguished when the indicator lights are not powered. Namely, the indicator light is turned off when the normally closed contact is turned off. As an implementation manner, the indication component HL1 may also be a sound component, for example, a sound prompt or the like may be emitted when the normally closed contact is turned off.
In the above scheme, as shown in the figure, the dc voltage source is a 24V dc voltage, and preferably, the dc voltage source is a preset dc voltage source in the electric shovel frequency conversion and speed regulation electrical system, that is, a dc power supply does not need to be additionally added, so that the integration of the whole device is improved, and the circuit design is simplified.
Further preferably, in the above solution, as shown in fig. 3 and 4, the relay KF1 includes a normally open contact; in the electric shovel frequency-conversion speed-regulation electrical system, a group of PLC power lines are led out to be connected with the first ends of the normally open contacts, and when the voltage monitoring protector U1 is turned off, the normally open contacts are opened, so that the port of a PLC controller connected with the PLC power lines is powered off. Therefore, a PLC controller connected with the PLC power line can immediately obtain a signal for controlling the voltage of the UPS to exceed a set threshold value. Furthermore, a time delay unit is arranged in a PLC controller connected with the PLC power line, and is triggered by a power-off signal of a PLC controller port connected with the PLC power line; and the PLC is shut down after the set time triggered by the time delay unit. Above scheme can monitor the control voltage's of power shovel change in the power shovel operation, when the outer net voltage is too high causes control power UPS wire jumper bypass mode, triggers the power shovel time delay and shuts down, guarantees the safe operation of power shovel equipment.
When the electric shovel variable-frequency speed regulation electric system is specifically designed, the voltage monitoring protector U1 and the relay KF1 are arranged in a control cabinet of the electric shovel variable-frequency speed regulation electric system, and the indicating component HL1 is positioned outside the control cabinet.
Further, in the above scheme, the voltage monitoring protector U1 is a self-resetting overvoltage and undervoltage protector, and in practical application, a XYLD-63S type double-flash self-resetting overvoltage and undervoltage protector can be selected. When wiring, the self-recovery overvoltage and undervoltage protector is connected with the output end low-voltage contactor of the control power supply UPS. The purpose of monitoring and controlling the power supply voltage of the UPS can be achieved on the premise that the original circuit design and the realization function of the electric shovel are not changed. And the XYLD-63S type double-flash self-recovery overvoltage and undervoltage protector can perform overvoltage protection, undervoltage protection, overcurrent protection, overload protection, short-circuit protection and lightning protection on a circuit, an overcurrent indicator lamp of the XYLD-63S type double-flash self-recovery overvoltage and undervoltage protector is turned on, namely, abnormal large current appears in a loop, and after fault processing is finished, the XYLD-63S type double-flash self-recovery overvoltage and undervoltage protector can reset automatically, and the fault is relieved.
In some schemes, silver material layers are plated on the surfaces of the normally open contact and the normally closed contact of the relay KF1, so that the electric signal response speed of the relay KF1 is improved. The relay KF1 can select 220AC JQX-62F-2Z intermediate relay.
When the circuit connection is realized, the XYLD-63S type double-flash self-recovery overvoltage and undervoltage protector and the 220ACJQX-62F-2Z intermediate relay are installed in a PLC control cabinet of the electric shovel, and the 24DC DN16-22FS alarm indicator lamp is installed in a motor control cabinet. A0.75 flat-band shielding communication cable is taken, the voltage at the upper end of a switch Q063 of a control power UPS is introduced into the N end and the L end of an XYLD-63S type double-flash self-recovery type under-voltage protector (note that a control live wire and a control zero line cannot be reversely connected), the voltage N end and the L end of the output end of the XYLD-63S type double-flash self-recovery type under-voltage protector are connected into 220AC JQX-62F-2Z intermediate relay coils A1 and A2 corresponding to normally closed contacts of an intermediate relay, a group of power lines are taken from a PLC power line terminal to be connected into normally open contacts of the intermediate relay, and a control line is led out from the normally open contacts of the intermediate relay to be connected into one port of an input board XB of the PLC. Can adopt the host computer to be connected with the PLC controller, so can record the fault condition when the voltage of the electric shovel that the PLC controller obtained is too high. When the voltage control device is applied, the power-off voltage of the XYLD-63S type double-flash self-recovery overvoltage-undervoltage protector is set to 225V, because the voltage of the control power supply UPS is generally 218V, when the voltage of the control power supply UPS rises to be larger than 225V, the XYLD-63S type double-flash self-recovery overvoltage-undervoltage protector is turned off, the 220AC JQX-62F-2Z intermediate relay is powered off, the normally closed contact is turned off, and the 24DCDN16-22FS alarm indicator lamp flickers to indicate that the voltage of the control power supply UPS is too high. Meanwhile, a normally open contact of the 220AC JQX-62F-2Z intermediate relay is opened, an electric signal input to the PLC controller through a PLC power line is disconnected, and the PLC controller detects that the voltage of the UPS is too high to control the electric shovel to be turned off in a delayed mode. If a delayed shutdown fault occurs during maintenance, and an alarm indicator lamp positioned outside the motor control cabinet flickers, the control power supply UPS is only needed to reset, and when the voltage output of the control voltage UPS is normal, the XYLD-63S type double-flashing self-resetting overvoltage and undervoltage protector can automatically reset, so that the fault can be relieved.
In addition, the protection current value of the XYLD-63S type double-flash self-recovery type overvoltage/undervoltage protector is set to be 25A (the operation current of the electric shovel control system is 10A when the electric shovel is stopped in a field test, and the current of the electric shovel control system is 19.6A when the electric shovel operates in a full-load operation, so that the maximum protection threshold value of the current of the monitoring device is determined to be 25A), when the protection current value of the XYLD-63S type double-flash self-recovery type overvoltage/undervoltage protector is larger than the set value of 25A, the protection current value of the XYLD-63S type double-flash self-recovery type overvoltage/undervoltage protector is turned off, an intermediate relay loses power, a normally closed contact is turned off, an indicator lamp flickers, a normally open contact of the intermediate relay is turned on, an electric signal input to a PLC through a PLC power line is turned off, and the PLC detects that the XYLD-63S type double-flash self-recovery type overvoltage/undervoltage protector is turned off, so that the electric shovel is controlled to be turned off in a delayed shutdown state. I.e. the working process is similar when the current is too large or the voltage is too large, and the description is omitted here.
In an embodiment of the present application, there is also provided an electric shovel, a control power supply of the electric shovel is configured with the voltage monitoring device of the electric shovel variable frequency speed control electrical system according to any one of the above aspects. The electric shovel that this embodiment provided can be for WK series electric shovel, install voltage monitoring device additional through the return circuit for control power supply, can monitor the change of electric shovel control system's voltage in the electric shovel operation, when the extranet voltage is too high to cause control power supply jumper bypass mode, trigger electric shovel time delay shutdown procedure, guarantee the safe operation of equipment, do not make electric shovel control system operating voltage too high cause local plate high temperature overload operation, stop consequently and the hidden danger of firing that produces.
In addition, the scheme provided in the above embodiment of the present application is described by taking the case of the control power supply with an ultrahigh voltage as an example, in fact, because the protection device selected for use in the embodiment of the present application can monitor the undervoltage, when the voltage of the control power supply UPS is too low, the scheme of the present application can also adopt the same working mode to perform alarm prompt, so that the electric shovel control system does not run under the undervoltage condition, the power failure hidden danger of the control contactor actuation unstable high-voltage cabinet vacuum contactor caused by too low control voltage is eliminated, and the reliable field monitoring is provided for maintenance personnel.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications from the teachings herein remain within the scope of this application.
Claims (10)
1. The utility model provides an electric shovel variable frequency speed control electrical system's voltage monitoring device which characterized in that includes:
the voltage monitoring protector is connected with a voltage output end of a control power supply of the electric shovel frequency-conversion speed-regulation electrical system, and is turned off when the voltage value of the control power supply exceeds a set threshold value;
the input end of the relay is connected with the output end of the voltage monitoring protector, the first end of a normally closed contact of the relay is connected with a direct-current voltage source, when the voltage monitoring protector is turned off, the relay loses power, and the normally closed contact is turned off;
and the indicating component is connected with the second end of the normally closed contact of the relay, and the indicating component acts to indicate that the voltage of the control power supply is too high when the normally closed contact is turned off.
2. The voltage monitoring device of the electric shovel variable frequency speed regulation electrical system according to claim 1, characterized in that:
the indicating component is an indicating lamp, and the indicating lamp is turned off when the normally closed contact is turned off.
3. The voltage monitoring device of the electric shovel variable frequency speed regulation electrical system according to claim 1, characterized in that:
the direct current voltage source is a preset direct current voltage source in the electric shovel frequency conversion speed regulation electrical system.
4. The voltage monitoring device of the electric shovel frequency conversion speed regulation electrical system according to claim 1, characterized in that:
the relay comprises a normally open contact;
the PLC power line of the electric shovel variable frequency speed regulation electrical system is connected with the first end of the normally open contact, when the voltage monitoring protector is turned off, the normally open contact is opened, and the port of the PLC controller connected with the PLC power line is powered off.
5. The voltage monitoring device of the electric shovel variable frequency speed regulation electrical system according to claim 4, characterized in that:
a time delay unit is arranged in the PLC, and is triggered by a power-off signal of a PLC port connected with the PLC power line;
and the PLC is shut down after the set time triggered by the time delay unit.
6. The voltage monitoring device of the electric shovel variable-frequency speed-regulating electrical system according to any one of claims 1 to 5, characterized in that:
the voltage monitoring protector is a self-recovery overvoltage and undervoltage protector.
7. The voltage monitoring device of the electric shovel frequency conversion speed regulation electrical system according to claim 6, characterized in that:
the self-recovery overvoltage and undervoltage protector is connected with the output end low-voltage contactor of the control power supply.
8. The voltage monitoring device of the electric shovel frequency conversion speed regulation electrical system according to claim 6, characterized in that:
and silver material layers are plated on the surfaces of the normally open contact and the normally closed contact of the relay.
9. The voltage monitoring device of the electric shovel variable frequency speed regulation electrical system according to claim 8, characterized in that:
and the voltage monitoring protector and the relay are arranged in a control cabinet of the electric shovel frequency conversion speed regulation electrical system.
10. An electric shovel characterized in that the control power supply of the shovel is provided with a voltage monitoring device of the electric shovel variable frequency speed control electrical system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220648989.7U CN217789290U (en) | 2022-03-23 | 2022-03-23 | Voltage monitoring device for frequency conversion and speed regulation electrical system of electric shovel and electric shovel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220648989.7U CN217789290U (en) | 2022-03-23 | 2022-03-23 | Voltage monitoring device for frequency conversion and speed regulation electrical system of electric shovel and electric shovel |
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| Publication Number | Publication Date |
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| CN217789290U true CN217789290U (en) | 2022-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220648989.7U Active CN217789290U (en) | 2022-03-23 | 2022-03-23 | Voltage monitoring device for frequency conversion and speed regulation electrical system of electric shovel and electric shovel |
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| CN (1) | CN217789290U (en) |
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- 2022-03-23 CN CN202220648989.7U patent/CN217789290U/en active Active
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