CN214798842U - Safety protection automatic control system for power supply loop of cantilever type heading machine - Google Patents
Safety protection automatic control system for power supply loop of cantilever type heading machine Download PDFInfo
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- CN214798842U CN214798842U CN202022876361.6U CN202022876361U CN214798842U CN 214798842 U CN214798842 U CN 214798842U CN 202022876361 U CN202022876361 U CN 202022876361U CN 214798842 U CN214798842 U CN 214798842U
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Abstract
The utility model relates to the technical field of engineering machinery, and discloses a safety protection automatic control system for a power supply loop of a cantilever type excavator, which comprises a safety relay, an emergency stop button, a main circuit breaker, a time delay tripping device and a mobile controller, wherein the input end of the main circuit breaker is connected with an AC1000V power supply of the main loop of the cantilever type excavator, and the output end of the main circuit breaker is connected with the safety relay through the time delay tripping device; the emergency stop button end of the safety relay is connected with the emergency stop button; one output point of the safety relay is connected with a limit switch of a cabinet door of the control cabinet in series and is connected with an undervoltage tripping device of the main circuit breaker through a delay tripping device; and other output points of the safety relay are connected into control loops of the cutting motor, the hydraulic motor, the first transportation motor and the second transportation motor. The utility model discloses can the remote control circuit breaker break-make, strengthened the maneuverability of circuit breaker. The safety of the whole system is enhanced.
Description
Technical Field
The utility model relates to an engineering machine tool technical field especially relates to a cantilever type entry driving machine power supply circuit safety protection automatic control system.
Background
The boom-type excavator is an important component of tunnel excavation engineering machinery, can realize continuous cutting, loading, transportation and other operations, and is large-scale excavating equipment. Both the loading power and the supply voltage are large. When field workers operate the heading machine, mechanical failure or some emergency special conditions are inevitable, and the heading machine which is performing excavation operation needs to be stopped quickly and reliably so as to avoid equipment damage or casualties.
The safety loop system of the cantilever type development machine designed in China mostly stops the operation of the control loops of all motors of the cantilever type development machine by pressing an emergency stop button arranged on a development machine body and disconnecting one path of normally closed contacts of the emergency stop button, and does not consider the problem of contact fusion of the normally closed contacts; the emergency stop button disconnects a control loop of the motor and then disconnects a power supply loop, the main power supply loop is still electrified, and the fault hidden danger of the electrified motor still exists; the scram button only has the stop protection on the hardware loop, and the stop protection on the software is ignored. In short, the safety and reliability of the protection device are low.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a cantilever type entry driving machine power supply circuit safety protection automatic control system aims at reinforcing high-pressure power supply circuit's security and reliability.
In order to achieve the purpose, the invention adopts the technical scheme that:
the safety protection automatic control system of the power supply loop of the cantilever type heading machine comprises a safety relay, an emergency stop device, a main circuit breaker, a time delay tripping device and a mobile controller, wherein the input end of the main circuit breaker is connected with an AC1000V power supply of the main loop of the cantilever type heading machine, and the output end of the main circuit breaker is connected with the safety relay through the time delay tripping device; the emergency stop end of the safety relay is connected with emergency stop equipment; a pair of normally open contacts of the emergency stop equipment is connected with the mobile controller;
one output point of the safety relay is connected with a limit switch of a cabinet door of the control cabinet in series and is connected with an undervoltage tripping device of the main circuit breaker through a delay tripping device;
and other output points of the safety relay are connected into control loops of the cutting motor, the hydraulic motor, the first transportation motor and the second transportation motor.
A boom-type roadheader power supply circuit safety protection automatic control system, the emergency stop equipment comprises: four emergency stop buttons, two belt conveyor pull rope switches, a belt conveyor controller emergency stop button, a control cabinet emergency stop button, a cab emergency stop button and a remote controller emergency stop button are arranged on the front, the rear, the left and the right of the whole cantilever excavator; normally closed contacts of all emergency stop buttons are connected with an emergency stop loop of a safety relay in series, and normally closed auxiliary points of starting contactors of the cutting motor, the hydraulic motor, the first motion motor and the second motion motor and a normally open contact of an operation relay of the mobile controller are all connected to a fault reset loop of the safety relay;
four emergency stop buttons, two belt conveyor pull rope switches, a belt conveyor controller emergency stop button, a control cabinet emergency stop button, a cab emergency stop button and a remote controller emergency stop button all comprise two pairs of normally closed contacts and a pair of normally open contacts, the two pairs of normally closed contacts of all emergency stop equipment are respectively connected in series, and then are connected to a safety relay to form a hardware protection device.
The safety protection automatic control system for the power supply loop of the cantilever type heading machine is characterized in that a main circuit breaker adopts NZMH3-AE630-S1 of Eaton Muller and is provided with an electric operating mechanism NZM3-XR208-240AC controlled by a remote switch, the electric operating mechanism is provided with an energy storage motor M, a switching-off coil C2 and a switching-on coil C1, the switching-on coil is closed, and the switching-off coil is opened.
A cantilever type development machine power supply loop safety protection automatic control system, the said time delay trip gear adopts Etton Muller UVU-NZM 220 and 240 VAC, it is DC18V voltage that the high voltage of the circuit that will be detected turns into the circuit breaker undervoltage trip gear needs; the threshold switch on the high-voltage side of the control cabinet and the output contact of the safety relay are connected in series to enter the delay tripping device, and the output voltage signal of the delay tripping device is connected into the undervoltage tripping device of the circuit breaker.
The automatic control system for the safety protection of the power supply loop of the cantilever type heading machine is characterized in that an undervoltage tripping device NZM 2/3-XUV is an accessory of a main circuit breaker for detecting whether the control voltage is normal or not.
The safety relay adopts a Schneider XPS AV11113 safety relay and is provided with 2 paths of parallel scram condition input points, 1 path of scram fault reset input points, 6 paths of safety relay safety output points and 3 paths of solid-state signal output points.
Due to the adoption of the technical scheme, the utility model discloses have following superiority:
a safety protection automatic control system and a method for a power supply loop of a cantilever type tunneling machine are a control system and a method for stopping the power supply loop of the tunneling machine when the tunneling machine breaks down. The invention is especially suitable for the tunnel excavation engineering machinery cantilever type tunneling, the safety protection of the whole power supply loop adopts the control mode of the electrical interlocking of equipment such as a safety relay, an emergency stop device, a main circuit breaker and the like, when a fault occurs, the main circuit breaker can be immediately tripped to cut off the power supply of the main loop, the control loops of all motors can be cut off through the safety relay, the power supply loop of each motor can be cut off, only after the power supply contactor of each motor loop is cut off, the safety relay can be reset after the fault point is removed, and each motor control loop can normally run. The safety relay and each motor control loop are electrically interlocked, so that the safety and the reliability of the electric control system are enhanced. The electric protection of a hardware loop and the program protection of a software loop are realized, and the safety and the reliability of the electric control system can be enhanced and the failure of the system can be reduced through double-loop protection. The concrete advantages are as follows:
1. the main circuit breaker adopts an electric control operating system, so that the on-off of the circuit breaker can be remotely controlled, and the operability of the circuit breaker is enhanced. The on-off of the circuit breaker and the hardware electrical interlocking among the actions of the control loop voltage, the threshold switch and the safety relay enhance the safety of the whole system.
2. The fault output normal open point of the safety relay is connected with each motor control loop, the normal close point of each motor operation contactor is connected with the reset loop of the safety relay, when the safety relay gives a fault alarm, each motor control loop is disconnected from hardware, and only after each motor contactor is disconnected with a motor and the motor is powered off, the safety relay can be reset, and through electrical interlocking, the control is safer.
3. One path of signal of the emergency stop equipment of the whole electric control system enters the mobile controller to be used as a software protection loop, so that the safety of the whole electric control system is further enhanced.
Drawings
FIG. 1 is a diagram of an electric control system of an emergency stop loop of a safety protection automatic control system of a power supply loop of a heading machine;
figure 2 is a schematic diagram of a main circuit breaker and time delay trip unit system;
FIG. 3 is a block diagram of a mobile controller protection function circuit of the automatic control system.
Fig. 4 is a circuit diagram of a control loop of the second motor.
Detailed Description
As shown in fig. 1, 2, 3 and 4, the safety protection automatic control system of the power supply loop of the cantilever type excavator comprises a safety relay, an emergency stop device, a main circuit breaker, a time delay tripping device and a mobile controller, wherein the input end of the main circuit breaker is connected with an AC1000V power supply of the main loop of the cantilever type excavator, and the output end of the main circuit breaker is connected with the safety relay through the time delay tripping device; the emergency stop end of the safety relay is connected with emergency stop equipment; a pair of normally open contacts of the emergency stop equipment is connected with the mobile controller; the scram device includes: four emergency stop buttons, two belt conveyor pull rope switches, a belt conveyor controller emergency stop button, a control cabinet emergency stop button, a cab emergency stop button and a remote controller emergency stop button are arranged on the front, the rear, the left and the right of the whole cantilever excavator.
Normally closed contacts of all emergency stop buttons are connected with an emergency stop loop of a safety relay in series, and normally closed auxiliary points of starting contactors of the cutting motor, the hydraulic motor, the first motion motor and the second motion motor and a normally open contact of an operation relay of the mobile controller are all connected to a fault reset loop of the safety relay;
one output point of the safety relay is connected with a limit switch of a cabinet door of the control cabinet in series and is connected with an undervoltage tripping device of the main circuit breaker through a delay tripping device;
and other output points of the safety relay are connected into control loops of the cutting motor, the hydraulic motor, the first transportation motor and the second transportation motor.
The main circuit breaker adopts NZMH3-AE630-S1 of Eaton Muller and is provided with an electric operating mechanism NZM3-XR208-240AC controlled by a remote switch, the electric operating mechanism is provided with an energy storage motor M, a switching-off coil C2 and a switching-on coil C1, the switching-on coil is closed when an electrified circuit breaker is switched on, and the switching-off coil is opened when the electrified circuit breaker is switched off.
The four emergency stop buttons, the two belt conveyor pull rope switches, the emergency stop button of the belt conveyor controller, the emergency stop button of the control cabinet, the emergency stop button of the cab and the emergency stop button of the remote controller all comprise two pairs of normally closed contacts and a pair of normally open contacts, the two pairs of normally closed contacts of all emergency stop equipment are respectively connected in series, and then are connected to the safety relay to form a hardware protection device.
The delay tripping device adopts Eaton Mueller UVU-NZM 220-plus 240 VAC, and converts the high voltage of a loop to be detected into DC18V voltage required by the undervoltage tripping device of the circuit breaker; the threshold switch on the high-voltage side of the control cabinet and the output contact of the safety relay are connected in series to enter the delay tripping device, and the output voltage signal of the delay tripping device is connected into the undervoltage tripping device of the circuit breaker. The undervoltage tripping device NZM 2/3-XUV is an accessory of the main circuit breaker for detecting whether the control voltage is normal or not.
The safety relay adopts a Schneider XPS AV11113 safety relay and is provided with 2 paths of parallel scram condition input points, 1 path of scram fault reset input points, 6 paths of safety relay safety output points and 3 paths of solid-state signal output points; the safety relay limits 2 paths of parallel scram condition input point signals to be switched on, and the scram fault reset input point signal is switched on, so that the safety relay can normally work.
The safety relay stops outputting as long as any one of the input signals of the 2-path parallel scram condition input points of the safety relay is disconnected; the input signals of the emergency stop fault reset input point of the 1-way safety relay are all switched on to normally work; when the safety relay works normally, the safety output points of the 6-path safety relay and the 3-path solid-state signal output points of the safety relay are all closed, and the safety output points of the 6-path safety relay and the 3-path solid-state signal output points are all disconnected when a fault occurs. The specific operation steps are as follows:
terminals S31 and S32, S21 and S22 of a safety relay 7K1 are two-way fault detection loops, four emergency stop buttons 8S 1-8S 4, a control cabinet emergency stop button 8AS1, 2 second-conveyor belt pull rope switches 8S 5-8S 6, a second-conveyor belt controller emergency stop button 26A1, a cab emergency stop button 2S4 and a remote controller emergency stop button 9AS1 of the heading machine, and two-way normally closed contacts of all emergency stop equipment and two-way normally open contacts of a mobile controller operation relay 39K1 are connected in series into the two-way fault detection loops of the safety relay;
when the safety relay normally operates, contacts connected with two fault detection circuits of the safety relay are in a closed state, and when the contact of any one device is disconnected, the safety relay can act; all the emergency stop equipment has a normally open contact to enter the mobile controller.
Terminals S33 and S34 of the safety relay 7K1 are reset circuits of the safety relay, and are connected in series with a normally closed contact of a 10K1 cutting motor bypass contactor, a normally closed contact of a 10K2 cutting motor high-speed contactor, a normally closed contact of a 10K3 cutting motor low-speed contactor, a normally closed contact of a 13K1 hydraulic motor main contactor, a normally closed contact of a 13K3 hydraulic motor star contactor, a normally closed contact of a 13K4 hydraulic motor angle contactor, normally closed contacts of 16K1 and 16K2 one-motion motor forward and reverse rotation contactors, a normally closed contact of an 18K1 two-motion motor contactor, a normally open contact of an operation relay in a 39K1 movement controller, a lamp reset button 7S1 of a control cabinet and a lamp reset button 6S1 of a cab;
when a fault occurs, after the generated fault is removed, all motors stop running, the normally closed contacts of the corresponding contactors are closed, the mobile controller normally runs, the safety relay can be reset by clicking a reset button with a lamp of a control cabinet or a cab, after the safety relay is reset, the fault state of the safety relay is removed, the output points of six output loops are closed, and all motor control loops enter the normal state; when a fault occurs, a red indicator lamp on the reset button is lightened, and after the fault is eliminated, the reset button is clicked, and the red indicator lamp is extinguished;
terminals 03 and 04, 13 and 14, 23 and 24 of the safety relay 7K1 are safety output channels which are instantly disconnected, terminals 37 and 38, 47 and 48, 57 and 58 are safety output channels which are disconnected in a delayed manner, and the safety channels are respectively connected into a cutting motor soft starter control circuit, a first-operation motor control circuit, a second-operation motor control circuit, a cutting motor control circuit, a hydraulic motor control circuit and a main circuit breaker control circuit;
when no fault exists, the safety relay safety output channel is closed, and each motor control loop is normal; when a fault occurs, the safety relay acts, the safety output channel is disconnected, each motor control loop is disconnected, and the motor stops running; before the safety relay is reset, all motor control loops are not switched on; terminals Y64, Y74 and Y84 are safety relay solid state signal output points into the mobile controller.
The output channel of the safety relay 7K1 is connected in series with the left and right threshold switches 4S1 and 4S2 of the control cabinet through the terminal 57 and the terminal 58 to be connected with the terminals X1 and X2 of the delay tripping device of the circuit breaker, the terminals 0 and 2 of the delay tripping device are connected with the control voltage AC220V, the output voltage control signal of the delay tripping device is connected with the terminals D1 and D2 of the circuit breaker through the terminals D1/51 and D2/52 to enter the undervoltage tripping device;
when the safety relay acts, the control cabinet door is opened or the AC220V control voltage is reduced, the main circuit breaker is subjected to undervoltage tripping and tripping, so that the power supply is disconnected;
as shown in fig. 3, one path of normally open contacts of the emergency stop button and the terminals Y64, Y74 and Y84 of the safety relay are all connected to the DI point of the mobile controller to perform a safety emergency stop protection procedure as software safety protection. When the contacts are disconnected, a software program in the mobile controller drives the intermediate relay to act, the control loop of each motor is disconnected, the alternating current contactor of the motor loop is disconnected, the power supply of the motor is disconnected, and the safety protection of the software loop is realized.
When an emergency occurs and one of the emergency stop buttons is pressed down, the main circuit breaker is opened from hardware, and the control circuit of each equipment motor is disconnected;
the contactors of the motors of all the devices are disconnected from software, and the power supply can be disconnected from hardware and software through a double-loop protection design, so that the double-circuit protection circuit has a double-insurance effect.
The main circuit breaker is provided with an electric operating mechanism controlled by a remote switch, adjusts a short-circuit instantaneous protection value and an overload protection value and is provided with an undervoltage tripping device; when the main circuit breaker trips due to short circuit, overcurrent or undervoltage, the circuit breaker is switched off to be in a tripping state, a tripping coil of an electric operating mechanism of the circuit breaker is automatically electrified through closing of a tripping auxiliary contact, the circuit breaker is moved to a tripping position, and the circuit breaker is prevented from being closed again due to misoperation; the terminals 71 of the main circuit breaker are the closing coil of the electric control operating mechanism, 70 is the opening coil, 75 is the circuit breaker closing indicating loop,
when the circuit breaker is in a closed mode, the indicator lamp 1H1 is lightened, the main circuit breaker remotely closes the circuit breaker through the control cabinet button 1S1, and the control cabinet button 1S2 remotely opens the circuit breaker; when the circuit breaker has a tripping fault, the tripping auxiliary point HIA is closed, the opening coil of the electric control operating mechanism is closed, the main circuit breaker is automatically disconnected, and the safety of the main power supply loop is enhanced.
When the voltage of a detection loop of the delay tripping device is reduced, the threshold switch of the control cabinet acts or the safety relay acts, the input voltage of the delay tripping device is smaller than DC18V due to one of the three conditions, and finally the undervoltage tripping device of the circuit breaker acts to trip the circuit breaker;
when the control voltage of the undervoltage tripping device is normal, the circuit breaker is normally closed, and when the control voltage is lower than the normal voltage by 15%, the undervoltage tripping device acts to trip and open the circuit breaker.
The control circuits of the motors are similar in structure, for example, a two-motion motor control circuit is taken as shown in fig. 4, an output circuit terminal 23 of a 7K1 safety relay, a terminal 24, a terminal 18F2 thermal relay normally closed contact, a 18K1 two-motion motor contactor coil, a 28K4 two-motion start-stop relay contact and an AC220V power supply are connected in series, the whole control circuit is electrified, the two-motion contactor is closed, the two-motion motor is started, the control circuit is disconnected, and the two-motion motor is stopped.
The main loop AC1000V power supply of the cantilever excavator is switched on and off by a molded case circuit breaker with rated voltage AC 1000V. Four emergency stop buttons, two belt conveyor pull rope switches, a belt conveyor controller emergency stop button, a control cabinet emergency stop button, a cab emergency stop button and a remote controller emergency stop button are arranged on the front, the rear, the left and the right of the whole cantilever excavator, and normally closed contacts of all the emergency stop buttons are connected in series and connected into a high-performance safety relay emergency stop loop; and meanwhile, the normally closed auxiliary points of the starting contactors of the cutting motor, the hydraulic motor, the first motion motor and the second motion motor and the normally open contact of the normal operation relay of the mobile controller are all connected to a fault reset circuit of the safety relay. One path of output point of the safety relay and a limit switch of a cabinet door of the control cabinet are connected in series and connected with a time delay tripping device and an undervoltage tripping device of the main circuit breaker; other output points of the safety relay are connected into control loops of the cutting motor, the hydraulic motor, the first transportation motor and the second transportation motor, and only when the safety relay has no fault alarm, each motor control loop can normally operate to serve as hardware loop safety protection. And the normally open contacts of all emergency stop buttons are connected into the DI point of the mobile controller to be used as a safety emergency stop protection program to be used as software safety protection. When an emergency occurs and a certain emergency stop button is pressed down, a main circuit breaker is opened from hardware, and control circuits of motors of all equipment are disconnected; the contactors of the motors of the respective devices are opened from the software. Through the double-loop protection design, the power supply can be disconnected from hardware and software, and the double-circuit protection circuit has the function of double insurance.
The main circuit breaker is provided with an electric operating mechanism, and can be controlled by a remote switch as shown in figure 2. The circuit breaker can adjust the short-circuit instantaneous protection value and the overload protection value and is provided with an undervoltage tripping device. When the circuit breaker trips because of short circuit, overcurrent or undervoltage and other reasons, the circuit breaker can break to the tripping state, and the opening coil of the circuit breaker electric operating mechanism is automatically electrified through the closing of the tripping auxiliary contact, so that the circuit breaker is moved to the opening position, and the circuit breaker is prevented from being closed again due to misoperation.
The four emergency stop buttons, the two belt conveyor pull rope switches, the emergency stop button of the belt conveyor controller, the emergency stop button of the control cabinet, the emergency stop button of the cab and the emergency stop button of the remote controller all comprise two pairs of normally closed contacts and a pair of normally open contacts, and the two pairs of normally closed contacts of all emergency stop equipment are respectively connected in series and are finally connected into the safety relay to serve as hardware protection. During operation, any one of the two pairs of normally closed contacts is opened, which causes the safety relay to act. A pair of normally open contacts of the scram equipment is introduced into the mobile controller to be used as software protection.
The delay tripping device is a component used together with the undervoltage tripping device of the main circuit breaker, and converts the high voltage of a loop required to be detected into DC18V voltage required by the undervoltage tripping device of the circuit breaker. The threshold switch on the high-voltage side of the control cabinet and the output contact of the safety relay are connected in series to enter the delay tripping device, and the output voltage signal of the delay tripping device is connected into the undervoltage tripping device of the circuit breaker. When the voltage of the detection loop is reduced, the threshold switch of the control cabinet acts or the safety relay acts, the input voltage of the delay tripping device is smaller than DC18V due to one of the three conditions, and finally the undervoltage tripping device of the circuit breaker acts to trip the circuit breaker.
The undervoltage tripping device is an accessory of the circuit breaker, detects whether the control voltage is normal or not, normally closes the circuit breaker when the control voltage is normal, and trips and opens the circuit breaker when the control voltage is lower than the normal voltage by 15%.
The safety relay is a core element of the whole emergency stop control and is provided with 2 paths of parallel emergency stop condition input points, 1 path of emergency stop fault reset input points, 6 paths of safety relay large-current fault output points and 3 paths of small-current fault output points. The safety relay can normally work only when two channel signals of the safety relay are normal; in the working process, as long as any one channel signal is disconnected, the safety relay stops outputting until the two channel signals are normal and can not normally work after being reset.
As shown in fig. 1. In the figure, 7K1 refers to a safety relay, terminals S31 and S32, S21 and S22 of the safety relay are two-way fault detection loops, four emergency stop buttons 8S 1-8S 4 of the heading machine, an emergency stop button 8AS1 of a control cabinet, 2 two-way belt pull rope switches 8S 5-8S 6, an emergency stop button 26A1 of a two-way belt controller, an emergency stop button 2S4 of a cab, an emergency stop button 9AS1 of a remote controller and other two-way normally closed contacts of all emergency stop equipment and two-way normally open contacts of a mobile controller operation relay 39K1 are connected in series into the fault detection loop of the safety relay. When the safety relay normally operates, contacts connected with two fault detection circuits of the safety relay are in a closed state, and when the contact of any one device is disconnected, the safety relay can act. All the emergency stop equipment in the figure has a normally open contact which enters the mobile controller for software protection.
The terminals S33 and S34 are reset circuits of safety relays and are connected in series with a normally closed contact of a 10K1 cutting motor bypass contactor, a normally closed contact of a 10K2 cutting motor high-speed contactor, a normally closed contact of a 10K3 cutting motor low-speed contactor, a normally closed contact of a 13K1 hydraulic motor main contactor, a normally closed contact of a 13K3 hydraulic motor star contactor, a normally closed contact of a 13K4 hydraulic motor angle contactor, normally closed contacts of 16K1 and 16K2 one-motion motor forward and reverse rotation contactors, a normally closed contact of an 18K1 two-motion motor contactor, a normally open contact of an operation relay in a 39K1 movement controller, a lamp-provided reset button 7S1 of a control cabinet and a lamp-provided reset button 6S1 of a cab. When a fault occurs, after the generated fault is removed, all motors stop running, the normally closed contacts of the corresponding contactors are closed, the mobile controller normally runs, the safety relay can be reset by clicking a reset button with a lamp of a control cabinet or a cab, after the safety relay is reset, the safety relay removes the fault state, the output points of the six output loops are closed, and all the motor control loops enter the normal state. When a fault occurs, a red indicator lamp on the reset button is lightened, and after the fault is eliminated, the reset button is clicked, and the red indicator lamp is extinguished.
The terminals 03 and 04, 13 and 14, 23 and 24 are safety output channels which are instantly disconnected, the terminals 37 and 38, 47 and 48, 57 and 58 are safety output channels which are disconnected in a delayed mode, and the safety channels are respectively connected into a cutting motor soft starter control circuit, a first-operation motor control circuit, a second-operation motor control circuit, a cutting motor control circuit, a hydraulic motor control circuit and a main circuit breaker control circuit. When no fault exists, the safety relay safety output channel is closed, and each motor control loop is normal; when a fault occurs, the safety relay acts, the safety output channel is disconnected, the control loops of the motors are disconnected, and the motors stop running. The individual motor control loops are not switched on until the safety relay is reset. The terminals Y64, Y74 and Y84 are safety relay action output points, safety relay internal K1-K2 output points and safety relay internal K3-K4 output points, and all the output points enter the mobile controller for software protection.
The control loop principle of each motor is shown in a control loop of a second-motion motor in fig. 3, an output loop terminal 23 of a 7K1 safety relay, a normally closed contact of a terminal 24, a normally closed contact of a 18F2 thermal relay, a contactor coil of the 18K1 second-motion motor, a contact of a 28K4 second-motion start-stop relay are connected with an AC220V power supply in series, the whole control loop is electrified, the second-motion contactor is closed, the second-motion motor is started, the control loop is disconnected, and the second-motion motor is stopped.
As shown in fig. 2, 6 is a main incoming line breaker, and 7 is a breaker delay trip device. The main circuit breaker is provided with an electric control operating mechanism, a terminal 71 is a closing coil of the electric control operating mechanism, a terminal 70 is an opening coil, a terminal 75 is a circuit breaker closing indicating circuit, and when the circuit breaker is in a closing type, an indicating lamp 1H1 is turned on. The main circuit breaker remotely closes the circuit breaker via the control cabinet button 1S1, and the control cabinet button 1S2 remotely opens the circuit breaker. When the circuit breaker has a tripping fault, the tripping auxiliary point HIA is closed, the opening coil of the electric control operating mechanism is closed, and the main circuit breaker is automatically disconnected. The safety of the main power supply loop is enhanced.
In fig. 2, 7K1 is a safety relay, the output channel of the safety relay is connected in series with the terminals X1 and X2 of the delay tripping device of the circuit breaker through the terminals 57 and 58 and the left and right threshold switches 4S1 and 4S2 of the control cabinet, the terminals 0 and 2 of the delay tripping device are connected to the control voltage AC220V, and the output voltage control signal of the delay tripping device is connected to the terminals D1 and D2 of the circuit breaker through the terminals D1/51 and D2/52 to enter the undervoltage tripping device. When the safety relay acts, the control cabinet door is opened or the AC220V control voltage is reduced, the main circuit breaker is tripped in an undervoltage tripping mode, and therefore the power supply is disconnected.
Claims (7)
1. A boom-type development machine power supply loop safety protection automatic control system is characterized in that: the system comprises a safety relay, an emergency stop device, a main breaker, a time delay tripping device and a mobile controller, wherein the input end of the main breaker is connected with a cantilever excavator main loop AC1000V power supply, and the output end of the main breaker is connected with the safety relay through the time delay tripping device; the emergency stop end of the safety relay is connected with emergency stop equipment; a pair of normally open contacts of the emergency stop equipment is connected with the mobile controller; one output point of the safety relay is connected with a limit switch of a cabinet door of the control cabinet in series and is connected with an undervoltage tripping device of the main circuit breaker through a delay tripping device; and the cutting, hydraulic, first transportation and second transportation output points of the safety relay are respectively connected with control loops of a cutting motor, a hydraulic motor, a first transportation motor and a second transportation motor.
2. The boom-type roadheader power supply circuit safety protection automatic control system as claimed in claim 1, wherein: the scram apparatus includes: four emergency stop buttons, two belt conveyor pull rope switches, a belt conveyor controller emergency stop button, a control cabinet emergency stop button, a cab emergency stop button and a remote controller emergency stop button are arranged on the front, the rear, the left and the right of the whole cantilever excavator; the normally closed contacts of all the emergency stop buttons are connected with an emergency stop loop of the safety relay in series, and the normally closed auxiliary points of the starting contactors of the cutting motor, the hydraulic motor, the first motion motor and the second motion motor and the normally open contact of the operation relay of the mobile controller are all connected to a fault reset loop of the safety relay.
3. The boom-type roadheader power supply circuit safety protection automatic control system as claimed in claim 2, wherein: the four emergency stop buttons, the two belt conveyor pull rope switches, the emergency stop button of the belt conveyor controller, the emergency stop button of the control cabinet, the emergency stop button of the cab and the emergency stop button of the remote controller all comprise two pairs of normally closed contacts and a pair of normally open contacts, the two pairs of normally closed contacts of all emergency stop equipment are respectively connected in series, and then are connected to the safety relay to form a hardware protection device.
4. The boom-type roadheader power supply circuit safety protection automatic control system as claimed in claim 1, wherein: the main circuit breaker adopts NZMH3-AE630-S1 of Eaton Muller and is provided with an electric operating mechanism NZM3-XR208-240AC controlled by a remote switch, the electric operating mechanism is provided with an energy storage motor M, a switching-off coil C2 and a switching-on coil C1, the switching-on coil is closed when an electrified circuit breaker is switched on, and the switching-off coil is opened when the electrified circuit breaker is switched off.
5. The boom-type roadheader power supply circuit safety protection automatic control system as claimed in claim 1, wherein: the delay tripping device adopts Eaton Mueller UVU-NZM 220-plus 240 VAC, and converts the high voltage of a loop to be detected into DC18V voltage required by the undervoltage tripping device of the circuit breaker; the threshold switch on the high-voltage side of the control cabinet and the output contact of the safety relay are connected in series to enter the delay tripping device, and the output voltage signal of the delay tripping device is connected into the undervoltage tripping device of the circuit breaker.
6. The boom-type roadheader power supply circuit safety protection automatic control system as claimed in claim 1, wherein: the undervoltage tripping device NZM 2/3-XUV is an accessory of the main circuit breaker for detecting whether the control voltage is normal or not.
7. The boom-type roadheader power supply circuit safety protection automatic control system as claimed in claim 1, wherein: the safety relay adopts a Schneider XPS AV11113 safety relay and is provided with 2 paths of parallel scram condition input points, 1 path of scram fault reset input points, 6 paths of safety relay safety output points and 3 paths of solid-state signal output points.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022876361.6U CN214798842U (en) | 2020-12-04 | 2020-12-04 | Safety protection automatic control system for power supply loop of cantilever type heading machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022876361.6U CN214798842U (en) | 2020-12-04 | 2020-12-04 | Safety protection automatic control system for power supply loop of cantilever type heading machine |
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| Publication Number | Publication Date |
|---|---|
| CN214798842U true CN214798842U (en) | 2021-11-19 |
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| CN202022876361.6U Active CN214798842U (en) | 2020-12-04 | 2020-12-04 | Safety protection automatic control system for power supply loop of cantilever type heading machine |
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| Country | Link |
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| CN (1) | CN214798842U (en) |
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