CN117277244A - Automatic discharge control system, control method and drag-type excavator - Google Patents
Automatic discharge control system, control method and drag-type excavator Download PDFInfo
- Publication number
- CN117277244A CN117277244A CN202311065932.XA CN202311065932A CN117277244A CN 117277244 A CN117277244 A CN 117277244A CN 202311065932 A CN202311065932 A CN 202311065932A CN 117277244 A CN117277244 A CN 117277244A
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- Prior art keywords
- control cabinet
- controller
- contactor
- circuit breaker
- relay
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000007599 discharging Methods 0.000 claims abstract description 57
- 230000006378 damage Effects 0.000 abstract description 4
- 208000027418 Wounds and injury Diseases 0.000 abstract description 3
- 208000014674 injury Diseases 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- Component Parts Of Construction Machinery (AREA)
Abstract
The invention discloses an automatic discharging control system, a control method and a drag-type excavator. Discharge units are arranged between the control cabinet circuit breaker and the electric control cabinet controller, and between the soft start controller and the electric control cabinet controller, and the output ends of the discharge units are connected with a ground wire. When discharging, the power supply is disconnected with the control cabinet circuit breaker, the electric control cabinet controller controls the discharging unit to be communicated with the control cabinet circuit breaker and the soft start controller, and charges are discharged through the ground wire. According to the invention, the automatic discharging of the system is realized through the electric control cabinet controller and the discharging unit, so that the discharging operation is safer, and the personal injury to operators is reduced.
Description
Technical Field
The invention relates to the technical field of electrical system design, in particular to an automatic discharge control system, a control method and a towed excavator.
Background
In recent years, the cost of fuel is gradually increased, and the use cost of the excavator using diesel as fuel is increased, so that the new energy excavator using the battery pack is always high due to cost limitation, and the drag excavator between the two is generated. Because of the length limitation of the cable, the towed excavator is often applied to a fixed place range, the power supply of the vehicle comes from a power distribution cabinet of a factory building, and the excavator is matched with different machines, such as a sucker, lotus claws and the like, so that the vehicle is more suitable for the fixed working environment of the factory building and the like, and the use cost of the vehicle is greatly reduced. As shown in fig. 1, the drag excavator is powered by a power distribution cabinet of a factory building as a power supply, and the power is transmitted to the excavator motor through a breaker of the vehicle-mounted control cabinet and vehicle-mounted soft start to finish the start.
The type excavator power supply is more used with voltage above 380V, when the excavator is powered off for maintenance, as the cable is capacitive, and the longer the cable line is, the easier the distributed capacitance exists, even though the circuit is powered off, a large amount of high-voltage charge is still kept in the cable line, if no effective discharging operation exists, the electrostatic charge in the cable line can bring serious damage to human bodies. The conventional discharging method is that after the whole vehicle is powered off, a professional discharging staff uses a discharging tool to perform manual discharging, the discharging mode cannot guarantee the safety of the discharging staff, and the discharging method has high requirements on the service capacity of the professional staff, and if the professional staff forgets to perform discharging operation, personal injury to the operator of the excavator is caused, so that the discharging method is very dangerous.
Disclosure of Invention
The invention aims to: aiming at the defect of low safety of manual discharge, the invention provides an automatic discharge control system, a control method and a towed excavator.
The technical scheme is as follows: in order to solve the problems, the invention adopts an automatic discharge control system, which comprises a power supply, a control cabinet circuit breaker connected with the power supply, a soft start controller connected with the control cabinet circuit breaker and an electric control cabinet controller; the control cabinet circuit breaker is connected with the electric control cabinet controller, a first discharging unit is arranged between the control cabinet circuit breaker and the electric control cabinet controller, the soft start controller is connected with the electric control cabinet controller, a second discharging unit is arranged between the soft start controller and the electric control cabinet controller, and the output ends of the first discharging unit and the second discharging unit are connected with a ground wire; the electric control cabinet controller is used for controlling the first discharging unit to be connected or disconnected with the control cabinet in a disconnected mode, and the second discharging unit to be connected or disconnected with the soft start controller; when discharging, the power supply is disconnected with the control cabinet circuit breaker, the electric control cabinet controller controls the first discharging unit and the second discharging unit to be respectively communicated with the control cabinet circuit breaker and the soft start controller, and charges are discharged through the ground wire.
Further, a first contactor is connected between the power supply and the circuit breaker of the control cabinet, and the power supply is connected with a normally closed contact of the first contactor; the first contactor is further connected with the electric control cabinet controller, a first relay is arranged between the first contactor and the electric control cabinet controller, and the first relay is used for adjusting the opening and closing conditions of the first contactor.
Furthermore, a first voltage instrument is arranged in front of the control cabinet circuit breaker and the electric control cabinet controller and used for detecting the voltage of the incoming line end of the control cabinet circuit breaker.
Further, the first discharging unit comprises a second voltage instrument, a second contactor and a second relay, the control cabinet circuit breaker is connected with the second voltage instrument, the second voltage instrument is connected with a normally open contact of the second contactor, the second contactor is connected with the second relay, the second relay is connected with the electric control cabinet controller, the second voltage instrument is used for detecting the voltage in the first discharging unit, the electric control cabinet controller is used for controlling the second relay, and the second relay is used for adjusting the opening and closing conditions of the second contactor; the output end of the second contactor is connected with the ground wire.
Further, the second discharging unit comprises a third voltage instrument, a third contactor and a third relay, the soft start controller is connected with the third voltage instrument, the third voltage instrument is connected with a normally open contact of the third contactor, the third contactor is connected with the third relay, the third relay is connected with the electric control cabinet controller, the third voltage instrument is used for detecting the voltage in the second discharging unit, the electric control cabinet controller is used for controlling the third relay, and the third relay is used for adjusting the opening and closing conditions of the third contactor; the output end of the third contactor is connected with the ground wire, and the second contactor is connected with the third contactor.
Further, the second contactor and the third contactor are attracted during discharging, so that the discharging wire of the circuit breaker of the control cabinet and the discharging wire of the soft start controller are grounded.
Further, the power supply equipment connected with the electric control cabinet controller is also arranged and is used for supplying power to the electric control cabinet controller under the condition that the power supply is disconnected.
Further, an alarm connected with the controller of the electric control cabinet is also arranged and used for giving out an alarm after the discharge is completed.
The invention also provides the drag-type excavator with the automatic discharge control system.
The invention also provides a control method of the automatic discharge control system, which comprises the following steps:
step 1, the power supply is powered off, and the controller of the electric control cabinet controls the power supply to be disconnected with the circuit breaker of the control cabinet;
step 2, an electric control cabinet controller controls a first discharging unit to be communicated with a control cabinet breaker, and a second discharging unit is communicated with a soft start controller;
step 3, setting discharge time by the controller of the electric control cabinet and discharging;
step 4, the controller of the electric control cabinet controls the first discharging unit to be disconnected with the circuit breaker of the control cabinet, and the second discharging unit is disconnected with the soft start controller;
and 5, controlling the power supply to be connected with the circuit breaker of the control cabinet by the controller of the electric control cabinet.
The beneficial effects are that: compared with the prior art, the invention has the remarkable advantages that the automatic discharging of the system is realized through the controller of the electric control cabinet, the first discharging unit and the second discharging unit, so that the discharging operation is safer, and the personal injury to operators is reduced.
Drawings
FIG. 1 is a schematic diagram of a power supply system for a drag-type excavator;
FIG. 2 is a schematic diagram of an automatic discharge control system according to the present invention;
FIG. 3 is a flow chart of an automatic discharge control method according to the present invention.
Detailed Description
As shown in fig. 2, an automatic discharge control system in this embodiment includes a power distribution cabinet of a factory building, a breaker of a vehicle-mounted control cabinet, a vehicle-mounted soft start, and a controller of an electric control cabinet. The power distribution cabinet of the factory building is connected with the contactor 1, the other end of the contactor 1 is connected with the breaker of the vehicle-mounted control cabinet, and the power distribution cabinet of the factory building is connected with the normally closed contact of the contactor 1, so that the power distribution cabinet of the factory building and the breaker of the vehicle-mounted control cabinet are kept in a connection state under the condition of no other interference; the contactor 1 is also connected with an electric control cabinet controller, and a relay 1 is connected between the contactor 1 and the electric control cabinet controller, and the electric control cabinet controller adjusts the opening and closing states of the contactor 1 by controlling the working state of the relay 1. The breaker of the vehicle-mounted control cabinet is connected with the vehicle-mounted soft start. When the excavator is powered, the vehicle-mounted soft start is connected with the excavator motor, the power distribution cabinet of the factory building is used as a power supply, and the power supply is sent to the excavator motor through the vehicle-mounted control cabinet circuit breaker and the vehicle-mounted soft start.
The vehicle-mounted control cabinet circuit breaker is connected with the electric instrument 2, and the electric instrument 2 is connected with a normally open contact of the contactor 2, so that a circuit of the vehicle-mounted control cabinet circuit breaker and the contactor 2 is in an off state under the condition of no external interference; the contactor 2 is connected with the relay 2, the relay 2 is connected with the controller of the electric control cabinet, and the electric elements are connected through discharge wires. The electric instrument 2 is used for detecting the voltage of a discharge loop, and the electric control cabinet controller adjusts the opening and closing conditions of the contactor 2 through the control relay 2.
The vehicle-mounted soft start is connected with the electric instrument 3, and the electric instrument 3 is connected with a normally open contact of the contactor 3, so that a circuit of the vehicle-mounted soft start and the contactor 3 is in a disconnection state under the condition of no external interference; the contactor 3 is connected with the relay 3, the relay 3 is connected with the controller of the electric control cabinet, and the electric elements are connected through discharge wires. The electric instrument 3 is used for detecting the voltage of a discharge loop, and the electric control cabinet controller adjusts the opening and closing conditions of the contactor 3 through the control relay 3. The contactor 2 is connected with the contactor 3 and the output ends of the contactor 2 and the contactor 3 are both grounded to the ground.
The vehicle-mounted control cabinet circuit breaker is also provided with another circuit which is directly connected with the electric control cabinet controller, and an electric instrument 1 is connected between the circuit breaker and the electric control cabinet controller and is used for detecting the voltage of the wire inlet end of the vehicle-mounted control cabinet circuit breaker. The electric control cabinet controller is externally connected with a storage battery and is used for supplying power to the electric control cabinet controller under the condition that the power distribution cabinet of the factory building is powered off, and when the excavator normally operates, the electric control cabinet controller can charge the storage battery. The electric control cabinet controller is also connected with a buzzer alarm, and when the system is discharged, the buzzer alarm flashes and gives an alarm.
As shown in fig. 3, the control method of the automatic discharging control system of the drag-type excavator comprises the following steps:
step 1, outage of a power distribution cabinet of a factory building, when an electric instrument 1 detects that the voltage of an incoming line end of a breaker of the vehicle-mounted control cabinet is 0, an electric control cabinet controller enables a normally closed contact of the contactor 1 to be opened and a normally open contact of the contactor 1 to be closed through controlling the contactor 1, and the breaker of the vehicle-mounted control cabinet is disconnected with the power distribution cabinet of the factory building.
Step 2, the controller of the electric control cabinet controls the relay 2 to be closed, so that a normally open contact of the contactor 2 is closed; the controller of the electric control cabinet controls the relay 3 to be closed, so that the normally open contact of the contactor 3 is closed; at this time, the discharge circuit is turned on, the contactor 2 and the contactor 3 are attracted, and the residual electric charge in the excavator power supply line is led out from the ground.
And 3, setting discharge time T to be more than or equal to 1min through an electric control cabinet controller, and simultaneously observing voltage readings of the electric instrument 2 and the electric instrument 3.
Step 4, when the readings of the electric instrument 2 and the electric instrument 3 are 0, indicating that the residual charges are all led out, and the electric control cabinet controller controls the relay 2 to be disconnected so that the normally open contact of the contactor 2 is disconnected; the electric control cabinet controller controls the relay 3 to be disconnected, so that the normally open contact of the contactor 3 is disconnected, and the discharging loop is disconnected with the vehicle-mounted control cabinet circuit breaker and the vehicle-mounted soft start.
And 5, the electric control cabinet controller controls the relay 1 to be opened, so that the normally closed contact of the contactor 1 is closed, the electric control cabinet controller controls the buzzer alarm to flash and give an alarm, and the power distribution cabinet of the factory building is connected with the breaker of the vehicle-mounted control cabinet in a recovery way.
Claims (10)
1. An automatic discharge control system is characterized by comprising a power supply, a control cabinet circuit breaker connected with the power supply, a soft start controller connected with the control cabinet circuit breaker and an electric control cabinet controller; the control cabinet circuit breaker is connected with the electric control cabinet controller, a first discharging unit is arranged between the control cabinet circuit breaker and the electric control cabinet controller, the soft start controller is connected with the electric control cabinet controller, a second discharging unit is arranged between the soft start controller and the electric control cabinet controller, and the output ends of the first discharging unit and the second discharging unit are connected with a ground wire; the electric control cabinet controller is used for controlling the first discharging unit to be connected or disconnected with the control cabinet in a disconnected mode, and the second discharging unit to be connected or disconnected with the soft start controller; when discharging, the power supply is disconnected with the control cabinet circuit breaker, the electric control cabinet controller controls the first discharging unit and the second discharging unit to be respectively communicated with the control cabinet circuit breaker and the soft start controller, and charges are discharged through the ground wire.
2. The automatic discharge control system of claim 1, wherein a first contactor is connected between the power supply and the control cabinet circuit breaker, and the power supply is connected with a normally closed contact of the first contactor; the first contactor is further connected with the electric control cabinet controller, a first relay is arranged between the first contactor and the electric control cabinet controller, and the first relay is used for adjusting the opening and closing conditions of the first contactor.
3. The automatic discharge control system of claim 2, wherein a first voltage meter is further provided before the control cabinet circuit breaker and the electric control cabinet controller for detecting a voltage at the incoming line terminal of the control cabinet circuit breaker.
4. The automatic discharge control system of claim 3, wherein the first discharge unit comprises a second voltage meter, a second contactor and a second relay, the control cabinet circuit breaker is connected with the second voltage meter, the second voltage meter is connected with a normally open contact of the second contactor, the second contactor is connected with the second relay, the second relay is connected with an electric cabinet controller, the second voltage meter is used for detecting the voltage in the first discharge unit, the electric cabinet controller is used for controlling the second relay, and the second relay is used for adjusting the opening and closing conditions of the second contactor; the output end of the second contactor is connected with the ground wire.
5. The automatic discharge control system of claim 4, wherein the second discharge unit comprises a third voltage meter, a third contactor and a third relay, the soft start controller is connected with the third voltage meter, the third voltage meter is connected with a normally open contact of the third contactor, the third contactor is connected with the third relay, the third relay is connected with the electric cabinet controller, the third voltage meter is used for detecting the voltage in the second discharge unit, the electric cabinet controller is used for controlling the third relay, and the third relay is used for adjusting the opening and closing conditions of the third contactor; the output end of the third contactor is connected with the ground wire, and the second contactor is connected with the third contactor.
6. The automatic discharge control system of claim 5, wherein the second contactor and the third contactor are engaged during discharge to ground the discharge line of the control cabinet circuit breaker and the discharge line of the soft start controller.
7. The automatic discharge control system of claim 1 further comprising a power supply device coupled to the cabinet controller for providing power to the cabinet controller in the event of a power failure.
8. The automatic discharge control system of claim 1 further comprising an alarm connected to the controller of the electronic control cabinet for alerting after the discharge is completed.
9. A drag-type excavator having the automatic discharge control system according to any one of claims 1 to 8.
10. A control method of the automatic discharge control system according to any one of claims 1 to 8, comprising the steps of:
step 1, the power supply is powered off, and the controller of the electric control cabinet controls the power supply to be disconnected with the circuit breaker of the control cabinet;
step 2, an electric control cabinet controller controls a first discharging unit to be communicated with a control cabinet breaker, and a second discharging unit is communicated with a soft start controller;
step 3, setting discharge time by the controller of the electric control cabinet and discharging;
step 4, the controller of the electric control cabinet controls the first discharging unit to be disconnected with the circuit breaker of the control cabinet, and the second discharging unit is disconnected with the soft start controller;
and 5, controlling the power supply to be connected with the circuit breaker of the control cabinet by the controller of the electric control cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311065932.XA CN117277244A (en) | 2023-08-23 | 2023-08-23 | Automatic discharge control system, control method and drag-type excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311065932.XA CN117277244A (en) | 2023-08-23 | 2023-08-23 | Automatic discharge control system, control method and drag-type excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117277244A true CN117277244A (en) | 2023-12-22 |
Family
ID=89211345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311065932.XA Pending CN117277244A (en) | 2023-08-23 | 2023-08-23 | Automatic discharge control system, control method and drag-type excavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117277244A (en) |
-
2023
- 2023-08-23 CN CN202311065932.XA patent/CN117277244A/en active Pending
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