Elevator power-off emergency maintenance circuit

Abstract

The utility model discloses an elevator power-off emergency maintenance circuit, which relates to the technical field of elevator maintenance, and has the technical scheme that the elevator power-off emergency maintenance circuit comprises a maintenance circuit, a leveling circuit, a door opening circuit and a port J4, the maintenance circuit and the leveling circuit are delay circuits, the delay time of the maintenance circuit is shorter than that of the leveling circuit, and the port J4 is connected with the port J4. The time-delay circuit and the door-opening circuit are jointly and electrically connected with a voltage transformation circuit, the voltage transformation circuit is used for supplying power to the time-delay circuit and the door-opening circuit, the port J4 is electrically connected with the voltage transformation circuit, the door-opening circuit comprises a relay K3, and the voltage transformation circuit achieves switching of electrical connection with the time-delay circuit or the door-opening circuit through the relay K3. And the normally closed end of the relay K3 and the delay circuit form a closed circuit. Switching of the time delay circuit and the door opening circuit is achieved through the relay K3, it is guaranteed that an elevator safely reaches a flat layer and is opened, the voltage transformation circuit can be well compatible with voltages of different elevator system control circuits, and practicability under various conditions is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator maintenance, and more specifically, to an elevator power failure emergency maintenance circuit. Background Art

[0002] At present, most domestic elevator industry systems have emergency rescue function ports, which can achieve emergency rescue effects through external UPS equipment when the elevator power supply fails.

[0003] The elevator power failure emergency rescue device (UPS) is a device that automatically starts working when a running elevator suddenly encounters a power supply system failure, such as power failure, phase loss, or fire, causing the elevator control system to be unable to operate normally, thereby trapping passengers. It can provide the elevator with the required power within the set time, run the elevator to the leveling position, and open the car door to allow passengers to exit the elevator safely.

[0004] The current methods of connecting to an external UPS device are:

[0005] The emergency rescue function is realized by communicating with the elevator system through the matching protocol board;

[0006] The UPS output signal allows the elevator to automatically switch to the maintenance mode, and then go up to the leveling area for maintenance. The car door is opened to allow passengers to exit the elevator safely, thus achieving emergency rescue in case of power outage.

[0007] The elevator is powered by UPS, so that it enters normal mode and goes up to the nearest leveling floor. After the door is opened at the leveling floor and the rescue is completed, the UPS continues to output signals to keep the elevator door open, or inputs a set of signals into the UPS to shut it down and stop supplying power to the elevator.

[0008] However, many foreign elevator systems, such as Mitsubishi, Otis, Toshiba, etc., basically use communication protocols that are not open to the outside world to realize emergency rescue functions. The remaining methods mentioned above all require UPS to output multiple signals, which will lead to complex wiring, many problems encountered in on-site operation, and poor operability. You may encounter the following working conditions:

[0009] Various elevator systems have different requirements for the multiple groups of signals output by the UPS, and there will be time sequence requirements;

[0010] The signals output by many UPSs are not compatible with the voltages (such as DC12V, DC24V, DC30V, DC48V, etc.) of the control circuits on different elevator systems because their circuits are too simple.

[0011] After the elevator reaches the floor and opens the door, some elevator systems will have a function of restarting and forcing the door to close, or forcing the elevator to return to the base station, which may cause people to be trapped.

[0012] The diversity of leveling signals of various elevator systems, such as the power supply voltages of NPN optical level sensors and PNP optical level sensors are DC12V, DC24V, etc.;

[0013] The UPS used is not compatible with the elevator system on site and cannot realize the elevator emergency rescue function. It is necessary to temporarily connect multiple relays and time relays on site to realize the emergency rescue wiring in the maintenance mode;

[0014] The signals output by most UPS in maintenance mode are integrated on their main boards. When connecting to the elevator system, multiple signal cables are required for transmission. After the connection, it is not beautiful and neat, and the wiring is prone to detachment after a long time.

[0015] Therefore, it is necessary to provide an elevator power failure emergency maintenance circuit to solve the above problems. Utility Model Content

[0016] The utility model aims to provide an elevator power failure emergency maintenance circuit to solve the problems raised in the above background technology.

[0017] The above technical objectives of the utility model are achieved through the following technical solutions:

[0018] An elevator power failure emergency maintenance circuit includes a maintenance circuit, a leveling circuit and a door opening circuit, and also includes a port J3 and a port J4. The maintenance circuit and the leveling circuit are both delay circuits. The delay time of the maintenance circuit is shorter than the delay time of the leveling circuit. The delay circuit and the door opening circuit are electrically connected to a transformer circuit, and the transformer circuit is used to supply power to the delay circuit and the door opening circuit. The port J4 is electrically connected to the transformer circuit. The door opening circuit includes a relay K3. The transformer circuit is switched to be electrically connected to the delay circuit or the door opening circuit through the relay K3, and the normally closed end of the relay K3 forms a path with the delay circuit.

[0019] The technical solution of the utility model is further configured as follows: the maintenance circuit includes a voltage follower U4A, an electrolytic capacitor C5, a comparator U4B and a relay K1, the voltage follower U4A is provided with two input ports U4A-2 and U4A-3, the electrolytic capacitor C5 is electrically connected to the U4A-3, the other end of the electrolytic capacitor C5 is electrically connected to the transformer circuit, the U4A-2 is electrically connected to the leveling circuit, the voltage follower U4A is provided with an output port U4A-1, the U4A-1 is electrically connected to the comparator U4B, the comparator U4B is electrically connected to the relay K1, and the relay K1 is used to output a maintenance signal.

[0020] The technical solution of the utility model is further configured as follows: the leveling circuit includes a voltage follower U5A, an electrolytic capacitor C6, a comparator U5B and a relay K2, the voltage follower U5A is provided with two input ports U5A-2 and U5A-3, the electrolytic capacitor C6 is electrically connected to the U5A-3, the other end of the electrolytic capacitor C6 is electrically connected to the transformer circuit, the U5A-2 is electrically connected to the maintenance circuit, the voltage follower U5A is provided with an output port U5A-1, the U5A-1 is electrically connected to the comparator U5B, the comparator U5B is electrically connected to the relay K2, and the relay K2 is used to output an uplink signal.

[0021] The technical solution of the utility model is further configured as follows: the maintenance circuit further includes a resistor R17 electrically connected to the electrolytic capacitor C5, the leveling circuit further includes a resistor R18 electrically connected to the electrolytic capacitor C6, and the resistance value of the resistor R18 is greater than the resistance value of the resistor R17.

[0022] The technical solution of the utility model is further configured as follows: the door opening circuit also includes an optocoupler U2 and an optocoupler U3, the optocoupler U3 is electrically connected to the optocoupler U2, the optocoupler U2 is electrically connected to the relay K3, the door opening circuit also includes a relay K4, the relay K4 is electrically connected to the relay K3, and the relay K4 is used to output a door opening signal.

[0023] The technical solution of the utility model is further configured as follows: the voltage conversion circuit is a Buck step-down circuit, the voltage conversion circuit includes a switching regulator U1, and the input voltage of the switching regulator U1 is at most DC60V.

[0024] The technical solution of the utility model is further configured as follows: the voltage conversion circuit also includes an inductor L1, the switching regulator U1 is provided with an input port IN, an output port OUT and a feedback port FB, the input port IN of the switching regulator U1 is electrically connected to the port J4, the output port OUT of the switching regulator U1 is electrically connected to the inductor L1, and the inductor L1 is electrically connected to the feedback port FB of the switching regulator U1 through the capacitor CA1 and the resistor RA2.

[0025] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0026] The voltage transformer circuit makes the signal output by the circuit compatible with the power supply voltage of the elevator system control circuit so as to adapt to various elevators on the market. Since the resistance value of the resistor R17 is smaller than that of the resistor R18, the electrolytic capacitor C5 is easier to store full energy, and the electrolytic capacitor C6 needs a longer time, thereby achieving the effect of control delay, so that the elevator first enters the maintenance mode, and then enters the leveling mode to start ascending. The relay K3 is used to allow the elevator to reach the leveling floor and open the door, and at the same time disconnect the maintenance circuit and the leveling circuit to prevent elevator failure and avoid trapping people. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a circuit structure diagram of the utility model. DETAILED DESCRIPTION

[0028] In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0029] Example:

[0030] like Figure 1 As shown, the utility model provides an elevator power failure emergency maintenance circuit, including a maintenance circuit, a leveling circuit, a door opening circuit, a port J3 and a port J4. The maintenance circuit and the leveling circuit are both delay circuits. The delay time of the maintenance circuit is shorter than the delay time of the leveling circuit. The delay circuit and the door opening circuit are electrically connected to a transformer circuit, which is used to supply power to the delay circuit and the door opening circuit. Port J4 is electrically connected to the transformer circuit. The door opening circuit includes a relay K3. The transformer circuit is switched to be electrically connected to the delay circuit or the door opening circuit through the relay K3. The normally closed end of the relay K3 forms a path with the delay circuit.

[0031] like Figure 1 As shown, the voltage conversion circuit is a Buck step-down circuit, which includes a switching regulator U1. The input voltage of the switching regulator U1 is up to DC60V. The voltage conversion circuit also includes an inductor L1. The switching regulator U1 is provided with an input port IN, an output port OUT and a feedback port FB. The input port IN of the switching regulator U1 is electrically connected to the port J4, the output port OUT of the switching regulator U1 is electrically connected to the inductor L1, the inductor L1 is electrically connected to the feedback port FB of the switching regulator U1 through the capacitor CA1 and the resistor RA2, the input port IN of the switching regulator U1 is also electrically connected to the electrolytic capacitor C2, and the voltage conversion circuit also includes a resistor RA1, a SMD Schottky diode DA1, an electrolytic capacitor C1, a resistor R2 and a red diode LED0.

[0032] When the elevator power supply system fails and causes the elevator to lose power, the elevator power failure emergency rescue device (UPS) equipped with this circuit is connected to the elevator system control cabinet, and the switching power supply of the elevator system control cabinet outputs the supply voltage (VCC) to the port J4 of this circuit to power the UPS. The supply voltage is converted into 12V DC after internal processing of the transformer circuit. Since the input voltage of the switching regulator U1 in the transformer circuit is up to DC60V, this circuit can be well compatible with the supply voltages of the control circuits of different elevator systems, such as DC12V, DC24V, DC30V, and DC48V.

[0033] like Figure 1 As shown, the maintenance circuit includes a voltage follower U4A, an electrolytic capacitor C5, a comparator U4B and a relay K1. The voltage follower U4A is provided with two input ports U4A-2 and U4A-3. The electrolytic capacitor C5 is electrically connected to U4A-3. The other end of the electrolytic capacitor C5 is electrically connected to the transformer circuit. U4A-3 is also electrically connected to a resistor R16, a resistor R17 and a diode D10. U4A-2 is electrically connected to the leveling circuit. The voltage follower U4A is provided with an output port U4A-1. U4A-1 is electrically connected to the comparator U4B. The maintenance circuit also includes a voltage-stabilizing diode ZD2, a resistor R13, a diode D8, a resistor R11, an NPN transistor Q2, a diode D5, a resistor R7 and a green diode LED1. The comparator U4B forms a path with the voltage-stabilizing diode ZD2, a resistor R13, a diode D8, a resistor R11, an NPN transistor Q2, a diode D5, a resistor R7, a green diode LED1 and a relay K1. Relay K1 is used to output a maintenance signal.

[0034] The 12V DC output by the transformer circuit is blocked by the diode D10 and can only charge the electrolytic capacitor C5 after passing through the resistor R17. After the electrolytic capacitor C5 is fully charged, the DC12V passes through the resistor R17 and flows into the input port U4A-3 of the voltage follower U4A, thereby achieving a delay effect and turning on this part of the maintenance circuit, allowing the relay K1 to work and output a set of maintenance signals (maintenance signal 1 and maintenance signal 2), and the elevator enters the maintenance mode.

[0035] like Figure 1As shown, the leveling circuit includes a voltage follower U5A, an electrolytic capacitor C6, a comparator U5B and a relay K2. The voltage follower U5A is provided with two input ports U5A-2 and U5A-3. The electrolytic capacitor C6 is electrically connected to U5A-3. The other end of the electrolytic capacitor C6 is electrically connected to the transformer circuit. U5A-3 is also electrically connected to a resistor R15, a resistor R18 and a diode D9. The voltage follower U5A is provided with an output port U5A-1. U5A-1 is electrically connected to the comparator U5B. The leveling circuit also includes a resistor R14, a capacitor C4, Resistor R12, capacitor C3, Zener diode ZD1, resistor R9, diode D6, resistor R8, NPN transistor Q1, diode D4, resistor R6 and green diode LED2, U5A-2 forms a path with the maintenance circuit, resistor R14, capacitor C4, resistor R12, capacitor C3, comparator U5B forms a path with Zener diode ZD1, resistor R9, diode D6, resistor R8, NPN transistor Q1, diode D4, resistor R6, green diode LED2, relay K2, and relay K2 is used to output the uplink signal.

[0036] The 12V DC output by the transformer circuit is blocked by the diode D9 and can only charge the electrolytic capacitor C6 after passing through the resistor R18. After the electrolytic capacitor C6 is fully charged, the DC12V passes through the resistor R18 and flows into the input port U5A-3 of the voltage follower U5A, thereby achieving a delay effect and turning on this part of the leveling circuit, allowing the relay K2 to work and output a set of up signals (maintenance COM and maintenance up signal), and the elevator starts to move upward and enter the leveling floor.

[0037] like Figure 1 As shown, the resistance of resistor R18 is greater than that of resistor R17, so that the charging speed of electrolytic capacitor C6 is lower than the charging speed of electrolytic capacitor C5, so that after a short delay, the maintenance circuit works before the leveling circuit, ensuring the time sequence of the elevator system. The action timing of the above two signals can well solve the problem that some elevator systems cannot give a maintenance signal at the beginning after power-on, otherwise they will freeze or be unable to go up, and avoid the problem that the elevator does not move due to the maintenance and leveling signals being given at the same time.

[0038] like Figure 1As shown, the door opening circuit also includes optocoupler U2 and optocoupler U3, the optocoupler U3 is electrically connected to the optocoupler U2 and a resistor R4 is provided therebetween, the door opening circuit also includes resistor R5, diode D1, resistor R3, diode D3, resistor R1 and green diode LED3, the optocoupler U2 forms a path with resistor R3, diode D3, resistor R1, green diode LED3 and relay K3, the diode D1 is electrically connected to the optocoupler U2, the resistor R5 is electrically connected to the optocoupler U3, the door opening circuit also includes relay K4, diode D7, resistor R10 and green diode LED4, the relay K4 is electrically connected to the relay K3, and the relay K4 is used to output a door opening signal.

[0039] After the elevator goes up and reaches the leveling floor, the elevator leveling signal sends a group of signals to the VDD+ and VDD- of the J3 port, and the relay K3 controlled by the optical coupler U2 is actuated, so that the relay K3 is disconnected from the delay circuit. At this time, the voltage provided by the transformer circuit is transmitted to the relay K4 via the relay K3, and the relay K4 is actuated to output a group of door opening signals (door opening signal 1 and door opening signal 2). Since the relay K3 is disconnected from the delay circuit, the relay K1 and the relay K2 lose power, the inspection signal and the leveling signal stop being output, and the elevator switches to normal mode. The elevator opens the door and releases the trapped passengers. Because the door opening signal is maintained during the UPS power supply period, The elevator will not respond to calls from external call panels on other floors, or secondary starts caused by forced return to the base station of some systems, to avoid trapping people. If some elevator systems have a forced door closing function or the door does not open after leveling again after power failure, the door opening signal can also be output to the door machine inverter to force the door to open. Because the timing of the door opening signal input to the elevator is only after the maintenance mode and leveling mode are ended and the normal mode is switched, it can solve the problem of some elevator systems that there is a door opening signal input when the UPS is powered on to supply power to the elevator system, avoiding the problem of the elevator system initializing and running at the beginning, thereby reporting a fault.

[0040] Due to the circuit design of the optocoupler U3 and the optocoupler U2, the door opening signal in the U2 circuit will not affect the normal use of the leveling photoelectric sensor when the elevator is powered by normal mains electricity. It is well compatible with the leveling signals output by the NPN type optical level sensor and the PNP type optical level sensor, and is also compatible with the input of the signal voltage DC12V or DC24V. During the UPS power supply period, if the mains electricity is input, the UPS will output a set of signals to the VCC of port J4 to disconnect it. The entire UPS loses power due to VCC, all circuits stop working, and all signals return to normal, which does not affect the normal use of the elevator.

[0041] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An elevator power failure emergency maintenance circuit, including a maintenance circuit, a leveling circuit and a door opening circuit, characterized in that: It also includes port J3 and port J4. The maintenance circuit and the leveling circuit are both delay circuits. The delay time of the maintenance circuit is shorter than the delay time of the leveling circuit. The delay circuit and the door opening circuit are electrically connected to a transformer circuit. The transformer circuit is used to supply power to the delay circuit and the door opening circuit. The port J4 is electrically connected to the transformer circuit. The door opening circuit includes a relay K3. The transformer circuit is switched to be electrically connected to the delay circuit or the door opening circuit through the relay K3. The normally closed end of the relay K3 forms a path with the delay circuit.

2. An elevator power failure emergency maintenance circuit according to claim 1, characterized in that: The maintenance circuit includes a voltage follower U4A, an electrolytic capacitor C5, a comparator U4B and a relay K1. The voltage follower U4A is provided with two input ports U4A-2 and U4A-3. The electrolytic capacitor C5 is electrically connected to U4A-3. The other end of the electrolytic capacitor C5 is electrically connected to the transformer circuit. U4A-2 is electrically connected to the leveling circuit. The voltage follower U4A is provided with an output port U4A-1. U4A-1 is electrically connected to the comparator U4B. The comparator U4B is electrically connected to the relay K1. The relay K1 is used to output a maintenance signal.

3. An elevator power failure emergency maintenance circuit according to claim 2, characterized in that: The leveling circuit includes a voltage follower U5A, an electrolytic capacitor C6, a comparator U5B and a relay K2. The voltage follower U5A is provided with two input ports U5A-2 and U5A-3. The electrolytic capacitor C6 is electrically connected to U5A-3. The other end of the electrolytic capacitor C6 is electrically connected to the transformer circuit. U5A-2 is electrically connected to the maintenance circuit. The voltage follower U5A is provided with an output port U5A-1. U5A-1 is electrically connected to the comparator U5B. The comparator U5B is electrically connected to the relay K2. The relay K2 is used to output an uplink signal.

4. An elevator power failure emergency maintenance circuit according to claim 3, characterized in that: The maintenance circuit further includes a resistor R17 electrically connected to the electrolytic capacitor C5, and the leveling circuit further includes a resistor R18 electrically connected to the electrolytic capacitor C6, and the resistance value of the resistor R18 is greater than the resistance value of the resistor R17.

5. The elevator power failure emergency maintenance circuit according to claim 1, characterized in that: The door opening circuit also includes an optocoupler U2 and an optocoupler U3, wherein the optocoupler U3 is electrically connected to the optocoupler U2, and the optocoupler U2 is electrically connected to the relay K3. The door opening circuit also includes a relay K4, wherein the relay K4 is electrically connected to the relay K3, and the relay K4 is used to output a door opening signal.

6. The elevator power failure emergency maintenance circuit according to claim 1, characterized in that: The voltage conversion circuit is a Buck step-down circuit, and the voltage conversion circuit includes a switching regulator U1. The input voltage of the switching regulator U1 is at most DC60V.

7. An elevator power failure emergency maintenance circuit according to claim 6, characterized in that: The voltage conversion circuit also includes an inductor L1. The switching regulator U1 is provided with an input port IN, an output port OUT and a feedback port FB. The input port IN of the switching regulator U1 is electrically connected to the port J4, the output port OUT of the switching regulator U1 is electrically connected to the inductor L1, and the inductor L1 is electrically connected to the feedback port FB of the switching regulator U1 through the capacitor CA1 and the resistor RA2.

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