CN109885126B - Control system for preventing misoperation of emergency stop device - Google Patents
Control system for preventing misoperation of emergency stop device Download PDFInfo
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- CN109885126B CN109885126B CN201910218037.4A CN201910218037A CN109885126B CN 109885126 B CN109885126 B CN 109885126B CN 201910218037 A CN201910218037 A CN 201910218037A CN 109885126 B CN109885126 B CN 109885126B
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Abstract
The invention discloses a control system for preventing misoperation of an emergency stop device, wherein output signals of an emergency stop button are respectively sent into the emergency stop device and a control unit, the output end of the emergency stop device is respectively connected with the control unit and a power-off driving unit, the power-off driving unit is used for controlling equipment to be powered off and stopped, and the control unit outputs signals to the equipment and is used for controlling the equipment to be powered off and stopped after receiving the emergency stop signals of the emergency stop device and the emergency stop button. The invention has the advantages that: judging whether the signal of the emergency stop button is consistent with the emergency stop device or not through the control unit, so that the accuracy of software shutdown is improved; and the power failure of the hardware is further controlled by the relay arranged on the hardware, so that the emergency stop can be realized more accurately, and the shutdown caused by the misoperation of the emergency stop is reduced or avoided.
Description
Technical Field
The invention relates to the field of electric automation control, in particular to a control system for preventing misoperation of a tight stop device.
Background
In the steel production process, the function of emergency stop in automatic control is to protect the safe operation of equipment and the whole system. In some cases, the emergency stop device can malfunction. If the misoperation of the S5-95F emergency stop device occurs for a plurality of times in an automatic control system adopted in a certain iron and steel enterprise, the action time lasts only 0.1 second and is automatically recovered, which causes a serious production accident that the casting machine of the iron and steel enterprise is sluggish. In other automatic control environments, the production safety performance of enterprises can also be influenced by false actions.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a control system for preventing misoperation of an emergency stop device, which reduces or avoids the misoperation on the premise of ensuring the normal work of the emergency stop device.
In order to achieve the purpose, the invention adopts the technical scheme that: the output signals of the emergency stop button are respectively sent to the emergency stop device and the control unit, the output end of the emergency stop device is respectively connected with the control unit and the power-off driving unit, the power-off driving unit is used for controlling equipment to be powered off and stopped, and the control unit outputs signals to the equipment and is used for controlling the equipment to be powered off and stopped after receiving the emergency stop signals of the emergency stop device and the emergency stop button.
The power-off driving unit comprises a contactor, a normally open contact of the contactor is connected in series in a power supply loop of the equipment, and the contactor is driven to be closed and opened by the emergency stop device.
The control system also comprises a relay ZL1, wherein the relay ZL1 is controlled by a control unit to be closed and opened, a normally open contact of the relay ZL1 is connected with a coil of the relay ZL2 in series to form a relay protection circuit, and two ends of the relay protection circuit are respectively connected with the positive electrode and the negative electrode of the power supply; the normally open contact of relay ZL2 is connected in parallel with the normally open contact of the contactor.
The number of the relays ZL1 is two, the relays ZL1 are respectively controlled by the control unit, and the normally open contacts are connected in series and then connected into a relay protection loop.
The number of the relays ZL2 is multiple, and the normally open contacts of the relays ZL2 are correspondingly connected in parallel at two ends of the normally open contacts of the contactor.
And a normally open contact of a time relay is connected in series in the relay protection circuit, the time relay delays after receiving the control signal output by the emergency stop device, and the normally open contact is disconnected after the delay is finished.
The invention has the advantages that: judging whether the signal of the emergency stop button is consistent with the emergency stop device or not through the control unit, so that the accuracy of software shutdown is improved; and the power failure of the hardware is further controlled by the relay arranged on the hardware, so that the emergency stop can be realized more accurately, and the shutdown caused by the misoperation of the emergency stop is reduced or avoided.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a schematic diagram of the system mechanism of the present invention;
FIG. 2 is a schematic diagram of a relay protection circuit of the present invention;
fig. 3 is a schematic diagram of the time relay of the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
On the premise of ensuring the normal use of the existing emergency stop function, the identification of false operation signals is realized, and judgment removal or delayed filtering is carried out on software and hardware simultaneously, so that production accidents are avoided.
The emergency stop principle comprises that an emergency stop device sends a control signal to a control unit, the control unit sends the control signal to a controller of the equipment, and software of the controller is shut down and emergency stopped; the output end of the emergency stop device simultaneously cuts off the power supply of the equipment through the power-off driving module, so that the purpose of simultaneously emergency stop of software and hardware is achieved.
The invention is improved on the basis, and the occurrence of false operation is avoided. Wherein the emergency stop signal of the emergency stop button is respectively transmitted to the control unit and the emergency stop device, the emergency stop device outputs the emergency stop signal to the input end of the control unit, and the output end of the control unit is connected to the equipment. The control unit adopts a PLC controller to control the software of the equipment to be shut down. When the emergency stop signal sent by the emergency stop device is consistent with the emergency stop signal sent by the emergency stop button, the emergency stop state is considered to belong to the emergency stop state, and the control unit sends a control signal to a controller in the equipment to control the controller of the equipment to shut down. That is, only after the control unit receives the emergency stop signal of the emergency stop device and the emergency stop signal of the emergency stop button, the control unit sends the equipment stop signal to the controller of the equipment, and the controller of the control equipment automatically stops the equipment and stops the operation. Otherwise, if the output signals of the emergency stop device and the emergency stop button are not consistent, the emergency stop device is possible to be in misoperation, at the moment, the shutdown is not carried out, the control unit does not send a control signal to a controller of the equipment, and the software of the equipment is not in a shutdown state.
The hardware power-off emergency stop of the equipment is realized on the hardware emergency stop of the equipment. The emergency stop device outputs a control signal to the contactor, and a normally open contact of the contactor is connected in series in a power supply loop of equipment, namely, a power supply is connected with the equipment through the normally open contact of the contactor. If the emergency stop device fails, the emergency stop device controls the contactor to break the normally open contact, so that the power supply of the equipment is cut off and the equipment is stopped emergently. In order to avoid power-off shutdown caused by misoperation of the emergency stop device, the control unit outputs a control signal to the relay ZL1 for controlling the relay ZL1 to be closed and opened, a normally open contact of the relay is connected with a coil of the relay ZL2 in series to form a relay protection circuit, and two ends of the relay protection circuit are respectively connected with the anode and the cathode of a power supply; the normally open contact of relay ZL2 is connected in parallel with the normally open contact of the contactor. The working principle is as follows: when emergency stop device output malfunction, its normally open contact that can control contactor opens this moment makes equipment outage, and the control unit can be closed through the normally open contact of drive control relay ZL1, then relay ZL 2's coil circular telegram and make relay ZL 2's normally open contact closed, because relay ZL 2's normally open contact is closed, then power supply can switch on to equipment through ZL 2's normally open contact, make equipment continue the power supply work, thereby can avoid because the shut down that the malfunction caused appears in emergency stop device shuts down.
And a normally open contact of a time relay is arranged in the relay protection circuit in series, the time relay delays after receiving the control signal output by the emergency stop device, and the normally open contact is disconnected after the delay is finished. Because the general malfunction time of the emergency stop device is 0.1 second and automatically returns, a time relay is arranged to carry out time delay operation. The working principle is as follows: when emergency stop device and emergency stop button signal are inconsistent, the control unit judges as the maloperation this moment, can control relay ZL 1's normally open contact closure, and emergency stop button is then by emergency stop device output control signal to time relay under the malfunction circumstances, time relay's normally open contact closure to break off after the time delay, after time relay's normally open contact closure, relay ZL 2's normally open contact closure, equipment still supplies power the operation this moment. After the delay time reaches, the normally open contact of the time relay is disconnected, the normally open contact of the relay ZL2 is disconnected at the moment, if the emergency stop device belongs to the misoperation, the emergency stop device can be recovered to be normal after the delay, and the equipment still supplies power to work through the closing of the normally open contact of the contactor at the moment, so that the shutdown caused by the misoperation is avoided. After a delay, the emergency stop device is still not recovered, i.e. the contactor contacts are still open, and the equipment is powered off and stopped because the normally open contacts of ZL2 are also open. The mode protects that if the misoperation of the emergency stop device cannot be automatically recovered, the equipment is still stopped for the sake of safety, and the maintenance is convenient.
As shown in fig. 2 and 3, the number of the relay ZL1 is one or two, the relays are respectively controlled by the control unit, and the normally open contacts are connected in series and then connected in the relay protection circuit. The number of ZL1 is two to avoid the fault that the relay contact is stuck and cannot be disconnected. Of course, one or more than one of them can be set to avoid such a situation. The number of the relays ZL2 is multiple, and the normally open contacts of the relays ZL2 are correspondingly connected in parallel at two ends of the normally open contacts of the contactor. The reason that relay ZL2 set up a plurality of is for adapting to contactor contact number, because the emergency stop device of production facility can export a plurality of signal control equipment and shut down, consequently in order to adapt to the normally open contact of different equipment departments, sets up a plurality of relays ZL2 and corresponds the equipment that each contactor normally open contact corresponds respectively.
As shown in fig. 2 and 3, K1 and K12 are normally open contacts of two relays ZL1, K3 and K31 are normally open contacts of two time relays, and ZL21, ZL22, ZL23 and ZL24 are coils of a plurality of relays ZL 2. L + and M are the positive and negative poles of the power supply respectively. K4 is the normally open contact of relay ZL4, and ZL31, ZL32, ZL33, ZL34 are a plurality of time relays respectively. As shown in the figure, the positive pole of the power supply sequentially passes through the normally-open contacts K1, K12, K3, K31 and the coils of ZL21 and then is connected with the negative pole of the power supply, and the coils of ZL22, ZL23 and ZL24 are respectively connected with two ends of the ZL21 in parallel.
Regarding time relay, the make-and-break device output signal is to relay LZ4 drive ZL 4's normally open contact K4's closed disconnection, and K4 one end is connected the power anodal, and the other end is connected with the negative pole behind time relay's the coil, and time relay can set up a plurality ofly, conveniently adapts to the number of the contactor of make-and-break device.
When the control unit judges that the emergency stop signal output by the emergency stop button is inconsistent with the emergency stop device, the emergency stop device is considered to belong to a false operation, the control unit outputs a control signal to drive a coil of a relay ZL1 to be electrified, so that K1 and K12 are closed, and the two relays ZL1 are arranged to avoid the defect that when the emergency stop device needs to be disconnected, the relay contacts are adhered to cause disconnection. The emergency stop device can send the normally open contact disconnection of control command control contactor because the malfunction, and control relay ZL 4's normally open contact K4 is closed simultaneously, and its normally open contact K3, K31 are closed after time relay's coil got electric, and relay ZL2 opens the contact closure this moment for equipment power supply loop still can the closed power supply. One or more of K3 and K31 may be provided, and the plurality is also provided to prevent a malfunction due to sticking when the contacts are opened. After the delay time is reached, the time relay is switched off K3 and K31, at the moment, the relay ZL2 is switched off, if the emergency stop device automatically recovers after the delay is finished, at the moment, the power supply work is continuously carried out through the contactor, and the shutdown accident caused by misoperation can be avoided; if the fault still exists after the delay is finished, at this time, because the relay ZL2 is disconnected and the contactor is also disconnected, power cannot be supplied at this time, and the equipment is disconnected for power supply and stops. At the moment, the contactor is driven to be disconnected when the emergency stop device malfunctions, and the time relay is driven to be disconnected after a period of time, so that a middle time delay protection function is realized, if the emergency stop device automatically recovers in the time delay, the equipment continues to normally work, if any fault occurs, the equipment is powered off and stopped at the moment because the time delay protection of the relay is finished, and the emergency stop device is convenient to overhaul.
The automatic control system is used for collecting on-site emergency stop signals of all loops, the hardware is additionally provided with a relay protection loop and a delay loop which are connected in parallel with an output loop of the emergency stop device, so that the identification of false operation signals is realized on the premise of ensuring the normal use of the existing emergency stop function, judgment, cutting and delay filtering are simultaneously carried out on the software and the hardware, and the occurrence of production accidents is avoided
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (4)
1. A control system for preventing the misoperation of a tight stop device is characterized in that: the output signals of the emergency stop button are respectively sent to the emergency stop device and the control unit, the output end of the emergency stop device is respectively connected with the control unit and the power-off driving unit, the power-off driving unit is used for controlling equipment to be powered off and stopped, and the control unit outputs signals to the equipment and is used for controlling the equipment to be powered off and stopped after the emergency stop signals of the emergency stop device and the emergency stop button are received;
the power-off driving unit comprises a contactor, a normally open contact of the contactor is connected in series in a power supply loop of the equipment, and the contactor is driven to be closed and opened by the emergency stop device;
the control system also comprises a relay ZL1, wherein the relay ZL1 is controlled by a control unit to be closed and opened, a normally open contact of the relay ZL1 is connected with a coil of the relay ZL2 in series to form a relay protection circuit, and two ends of the relay protection circuit are respectively connected with the positive electrode and the negative electrode of the power supply; the normally open contact of relay ZL2 is connected in parallel with the normally open contact of the contactor.
2. A control system for preventing malfunction of an emergency stop device, as defined in claim 1, wherein: the number of the relays ZL1 is two, the relays ZL1 are respectively controlled by the control unit, and normally open contacts of the relays ZL1 are connected in series and then connected into a relay protection loop.
3. A control system for preventing malfunction of an emergency stop device, as defined in claim 1, wherein: the number of the relays ZL2 is multiple, and the normally open contacts of the relays ZL2 are correspondingly connected in parallel at two ends of the normally open contacts of the contactor.
4. A control system for preventing malfunction of an emergency stop device, as defined in claim 1, wherein: and a normally open contact of a time relay is connected in series in the relay protection circuit, and the time relay receives a control signal output by the emergency stop device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910218037.4A CN109885126B (en) | 2019-03-21 | 2019-03-21 | Control system for preventing misoperation of emergency stop device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910218037.4A CN109885126B (en) | 2019-03-21 | 2019-03-21 | Control system for preventing misoperation of emergency stop device |
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| CN109885126A CN109885126A (en) | 2019-06-14 |
| CN109885126B true CN109885126B (en) | 2020-08-21 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107368011A (en) * | 2017-08-21 | 2017-11-21 | 马鞍山钢铁股份有限公司 | Multiple spot series connection tightly stops signal condition supervisory circuit |
| CN207116276U (en) * | 2017-07-26 | 2018-03-16 | 东华理工大学 | A kind of controllable scram button |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100220472B1 (en) * | 1996-12-20 | 1999-09-15 | 정몽규 | Misuse preventing system of transmission test at the time of emergent stop |
| CN102787231B (en) * | 2011-05-17 | 2014-09-03 | 上海宝信软件股份有限公司 | Emergency stopping method and emergency stopping apparatus for vertical looper of continuous annealing unit |
| CN102902211A (en) * | 2012-09-28 | 2013-01-30 | 烟台宝钢钢管有限责任公司 | Method for preventing malfunction of emergency stop and quick stop signals in control system |
| CN104018895B (en) * | 2014-06-19 | 2015-07-22 | 南京科远自动化集团股份有限公司 | ETS protective unit and triply-redundant steam turbine emergency protection system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207116276U (en) * | 2017-07-26 | 2018-03-16 | 东华理工大学 | A kind of controllable scram button |
| CN107368011A (en) * | 2017-08-21 | 2017-11-21 | 马鞍山钢铁股份有限公司 | Multiple spot series connection tightly stops signal condition supervisory circuit |
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