Escalator electricity-saving device capable of preventing electric impact and escalator ascending and descending equipment
By using DC contactors and auxiliary relays in escalator equipment to control the parallel connection of DC buses, the problems of power shock and safety hazards are solved, and power saving and safety are improved.
Patent Information
- Application Number
- CN202422880713.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Existing escalator power-saving devices are costly and may cause power pollution or safety hazards. In addition, when directly connecting the escalator DC bus in parallel, the voltage difference is not considered, which may cause power shock and damage the equipment.
DC contactors and auxiliary relays are used to control the parallel connection of the DC buses of the two escalators. Through the electromagnetic force control of the DC contacts and coils, parallel conduction is ensured when the escalators are stopped to avoid power shocks caused by voltage differences. The status is monitored through the safety box knob switch and indicator light.
It improves the energy-saving efficiency and safety of escalator equipment, avoids damage caused by power shock, and reduces equipment costs and safety hazards.
Smart Images
Figure CN223457962U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of elevator technology, in particular to an escalator power-saving device capable of preventing power impact and an up-and-down escalator equipment. BACKGROUND
[0002] The existing up-and-down escalator equipment is usually provided with an escalator power-saving device. The conventional escalator power-saving device is mainly used to feed the regenerated energy of the escalator back to the power grid, which is high in cost and may pollute the power grid. Alternatively, the regenerated energy of the escalator is collected and reused, which is also high in cost and requires a large-capacity energy storage module. The large-capacity energy storage module not only increases the cost of the equipment, but also increases the possibility of fire accidents due to the instability of the large-capacity energy storage module.
[0003] In addition, for some solutions in which the direct-current bus lines of the up-and-down escalators are directly connected in parallel, the timing of the closed operation is not considered. When the voltage difference between the direct-current bus lines of the two escalators is too large, closing the parallel bus lines is equivalent to short-circuiting the two power sources, which may cause power impact and damage the equipment. Some solutions consider the voltage difference, but use a PLC or other logic controller and a voltage collector to obtain the voltage difference between the two escalators, which greatly increases the cost of hardware and software. SUMMARY
[0004] Therefore, it is necessary to provide an escalator power-saving device capable of controlling the on-off of the parallel circuit of the direct-current bus lines of two escalators, improving the power-saving efficiency, and improving the safety of the equipment and personnel.
[0005] In a first aspect, an escalator power-saving device capable of preventing power impact is provided, which is applied to an up-and-down escalator equipment. The up-and-down escalator equipment includes a first escalator system and a second escalator system. The first escalator system includes a first direct-current bus line and a first power source L1. The second escalator system includes a second direct-current bus line and a second power source L2. The escalator power-saving device includes a direct-current contactor and an auxiliary relay. The direct-current contactor includes a direct-current contact Z and a direct-current coil R1. The auxiliary relay includes an auxiliary contact K and an auxiliary coil R2.
[0006] One end of the auxiliary coil R2 is connected to the first power source L1 or the second power source L2, and the other end is connected to a common ground. One end of the auxiliary contact K is connected to the direct-current coil R1, and the other end of the auxiliary contact K is connected to the second power source L2. The other end of the direct-current coil R1 is connected to the first power source L1. One end of the direct-current contact Z is connected to the first direct-current bus line, and the other end of the direct-current contact Z is connected to the second direct-current bus line.
[0007] When the first power supply L1 of the first escalator system and the second power supply L2 of the second escalator system are normally powered, the auxiliary coil R2 is powered to generate a first electromagnetic force, the auxiliary contact K is controlled to be closed, the DC coil R1 is powered to generate a second electromagnetic force, the DC contact Z is controlled to be closed, and the first DC bus and the second DC bus are connected in parallel.
[0008] In one of the embodiments, the device further comprises:
[0009] A safety box knob switch S is connected in series with the DC coil R1, and is used to disconnect the parallel connection of the first DC bus and the second DC bus before the first escalator system or the second escalator system is powered off.
[0010] In one of the embodiments, the device further comprises:
[0011] An indicator light D1 is connected in parallel across the DC coil R1, and is used to display whether the first DC bus and the second DC bus are connected in parallel according to the brightness of the light.
[0012] In one of the embodiments, the DC contactor further comprises a DC contact Z', which is connected in series with the DC coil R1, and one end of which is connected to the first power supply L1 and the other end of which is connected to the second power supply L2.
[0013] The DC contact Z' is used to control the DC contact Z and the DC contact Z' to be synchronously closed to form a self-locking loop when the DC coil R1 is powered to generate a second electromagnetic force.
[0014] In one of the embodiments, the auxiliary contact K is connected in parallel across the DC contact Z', and the auxiliary contact K is closed or disconnected when the DC contact Z and the DC contact Z' are synchronously closed to form a self-locking loop, and the DC coil R1 is powered to generate a second electromagnetic force.
[0015] In the second aspect, an escalator equipment with up and down escalators is provided, which comprises a first escalator system, a second escalator system, and the escalator power-saving device against power impact as described in the first aspect.
[0016] In one of the embodiments, the first escalator system further comprises a first main air switch, which is connected to an external power supply voltage source and the first controller, and is used to connect the external power supply voltage source to the first controller when closed, and convert the external power supply voltage source into the first power supply L1. The first controller comprises a first rectifier module and a first inverter module, the first rectifier module is used to convert alternating current into direct current, the first inverter module is used to convert direct current into alternating current, and the first rectifier module and the first inverter module are connected through the first DC bus.
[0017] And / or, the second escalator system further comprises a second main air switch,
[0018] The second main air switch is connected with an external power supply voltage source and a second controller, and is used to connect the external power supply voltage source to the second controller when closed, and convert the external power supply voltage source into a second power supply L2. The second controller comprises a second rectifier module and a second inverter module. The second rectifier module is used to convert alternating current into direct current. The second inverter module is used to convert direct current into alternating current. The second rectifier module is connected with the second inverter module through a second direct current bus.
[0019] In one embodiment, the first escalator system comprises a main air switch linkage switch K1 connected in series with a direct current coil R1, which is used to link and close the conduction when the first main air switch is closed, and connect the first power supply L1 to the first escalator system; the second escalator system comprises a main air switch linkage switch K2 connected in series with the direct current coil R1, which is used to link and close the conduction when the second main air switch is closed, and connect the second power supply L2 to the second escalator system.
[0020] In one embodiment, the first escalator system further comprises a first main contactor, a first motor,
[0021] The first main contactor is connected with the first controller and the first motor, and is used to close and conduct according to the first signal sent by the first controller, and control the first motor to operate according to the first signal.
[0022] In one embodiment, the first escalator system further comprises an auxiliary linkage contact NC1 connected in series with the auxiliary coil R2, which is used to link and close the conduction when the first power supply L1 of the first escalator system is normally powered and the first main contactor is not closed, and the auxiliary coil R2 is powered to generate a first electromagnetic force.
[0023] The escalator power-saving device and the up-and-down escalator equipment prevent power impact by setting a DC contactor and an auxiliary relay between the first escalator system and the second escalator system, the DC contactor comprising a DC contact Z and a DC coil R1, the auxiliary relay comprising an auxiliary contact K and an auxiliary coil R2, when the first power supply L1 of the first escalator system and the second power supply L2 of the second escalator system are normally powered, the auxiliary coil R2 generates a first electromagnetic force to control the auxiliary contact K to be closed, and the DC coil R1 generates a second electromagnetic force to control the DC contact Z to be closed, so that the first DC bus and the second DC bus are connected in parallel when the two escalator systems are in the stop state, and the power impact damage to the equipment caused by the too large voltage difference between the two escalator DC buses is prevented, and the reliability and safety of the entire up-and-down escalator equipment are improved. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0025] Figure 1 The structure block diagram of the up-and-down escalator equipment of an embodiment;
[0026] Figure 2a The connection of the escalator power-saving device of an embodiment to prevent power impact Figure 1 ;
[0027] Figure 2b The connection diagram two of the escalator power-saving device of an embodiment to prevent power impact
[0028] Figure 3 The connection diagram of the auxiliary contact K, the DC coil R1 and the DC contact Z' of an embodiment;
[0029] Figure 4 The connection diagram of the auxiliary contact K, the DC coil R1, the DC contact Z' and the safety box knob switch S of an embodiment;
[0030] Figure 5 The connection diagram of the auxiliary contact K, the DC coil R1, the DC contact Z', the safety box knob switch S and the indicator light D1 of an embodiment;
[0031] Figure 6 The connection diagram of the auxiliary contact K, the DC coil R1, the DC contact Z', the safety box knob switch S, the indicator light D1 and the main air switch linkage switch K1 and the main air switch linkage switch K2 of an embodiment;
[0032] Figure 7 Connection diagram of the auxiliary coil R2 and the auxiliary linkage contacts NC1 and NC2 of an embodiment. DETAILED DESCRIPTION
[0033] For the purpose of promoting an understanding of the principles of the application, the application will be described with reference to the accompanying drawings. The embodiments disclosed in the drawings are intended to explain the principles of the present application and enable those of ordinary skill in the art to most benefit from the teachings herein. Accordingly, the drawings are not intended to limit the scope of the application as encompassed by the appended claims.
[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
[0035] It should be understood that the terms "first", "second" and so on as used herein are used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor can be called a second resistor without departing from the scope of the application, and similarly, a second resistor can be called a first resistor. The first resistor and the second resistor are both resistors, but they are not the same resistor.
[0036] It should be understood that "connection" in the following embodiments means "electrical connection", "communication connection", etc. if the circuits, modules, units, etc. connected to each other have electrical signal or data transmission between each other.
[0037] It should be understood that "at least one" means one or more, and "multiple" means two or more. "At least part of the element" means part or all of the element.
[0038] As used herein, the singular forms "a", "an" and "the" are intended to include plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", or "has" and / or "having", as used herein, specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
[0039] The power surge protection escalator power saving device of an embodiment can be applied to an up-down escalator device. The up-down escalator device includes a first escalator system A, a second escalator system B, and a power surge protection escalator power saving device C. As shown inFigure 1 As shown, the first escalator system A includes a first DC bus, a first power supply L1, a first main air switch 100, a first controller 101, a first main contactor 102, and a first motor 103. The first controller 101 includes a first rectifier module and a first inverter module. The first rectifier module is used to convert AC power into DC power, and the first inverter module is used to convert DC power into AC power. The first DC bus is connected between the first rectifier module and the first inverter module. The second escalator system B includes a second DC bus, a second power supply L2, a second main air switch, a second controller, a second main contactor, and a second motor. The second controller includes a second rectifier module and a second inverter module. The second rectifier module is used to convert AC power into DC power, and the second inverter module is used to convert DC power into AC power. The second DC bus is connected between the second rectifier module and the second inverter module.
[0040] The modules of the first escalator system A and the second escalator system B have the same functions. Take the module connection and function of the first escalator system A as an example:
[0041] The first controller 101 is used to control the operating state of the first escalator system A.
[0042] The first main air switch 100 is connected to the external power supply voltage source and the first controller 101, and is used to connect the external power supply voltage source to the first controller 101 when the first main air switch 100 is closed, and the first controller 101 performs voltage division to obtain the first power supply L1.
[0043] The first main contactor 102 is connected to the first controller 101 and the first motor 103 , and is configured to close and conduct the first main contactor 102 according to a first signal sent by the first controller 101 , thereby controlling the first motor 103 to operate according to the first signal.
[0044] In one embodiment, an escalator power-saving device C for preventing power surges includes a DC contactor and an auxiliary relay. The DC contactor and the auxiliary relay control the on / off switching between a first DC bus and a second DC bus. The DC contactor includes multiple DC contacts Z and a DC coil R1. When DC coil R1 is energized, each DC contact Z is synchronously closed. The auxiliary relay includes at least one auxiliary contact K and an auxiliary coil R2. When auxiliary coil R2 is energized, each auxiliary contact K is synchronously closed.
[0045] like Figure 1 As shown, one end of at least one DC contact Z is connected to the first DC bus, and the other end of the DC contact Z is connected to the second DC bus.
[0046] As shown in Figure 2a , Figure 2b , one end of the auxiliary coil R2 is connected to the first power supply L1 or the second power supply L2, and the other end is connected to the common ground. One end of the auxiliary contact K is connected to the DC coil R1, and the other end of the auxiliary contact K is connected to the second power supply L2; the other end of the DC coil R1 is connected to the first power supply L1. Alternatively, the power supply connected to one end of the auxiliary coil R2 can not be limited to the first power supply L1 or the second power supply L2, but can also be a power supply end with a voltage difference between the common ground in the first escalator system A or the second escalator system B.
[0047] When the first power supply L1 of the first escalator system and the second power supply L2 of the second escalator system are normally powered, the auxiliary coil R2 is powered to generate a first electromagnetic force, the auxiliary contact K is controlled to be closed, the DC coil R1 is powered to generate a second electromagnetic force, the DC contact Z is controlled to be closed, and the first DC bus and the second DC bus are connected in parallel.
[0048] In detail, when the first power supply L1 of the first escalator system and the second power supply L2 of the second escalator system are normally powered and both escalator systems are in a stopped and static state, the auxiliary coil R2 is powered to generate a first electromagnetic force, the auxiliary contact K is controlled to be closed, and at this time the DC coil R1 is powered to generate a second electromagnetic force, the DC contact Z is controlled to be closed, ensuring that the two escalators are operated in parallel with the DC bus when not running, avoiding power impact due to a large voltage difference between the DC buses of the two escalators.
[0049] Further, as shown in Figure 3 , the DC contactor further comprises a DC contact Z', which is connected in series with the DC coil R1, one end of which is connected to the first power supply L1 and the other end of which is connected to the second power supply L2. The auxiliary contact K is connected in parallel to the DC contact Z'. When the DC coil R1 is powered to generate a second electromagnetic force and control the DC contact Z to be closed, the DC contact Z' is synchronously closed to form a self-locking loop, and thereafter the auxiliary contact K is closed or opened, and the power-on state of the DC coil R1 is not affected.
[0050] In the embodiment, it is assumed that the first escalator system A is a down escalator and the second escalator system B is an up escalator. When the first escalator system A is down, if the load of the escalator is large, the first motor of the first escalator system A will rotate to cut the magnetic induction lines to generate an electromotive force; and the power consumption of the up escalator system B will increase with the increase of the load. In the case that the down escalator generates power and the up escalator consumes power, the direct current busbars of the two escalators are connected in parallel to complete the transfer of energy, so that the power that should be consumed by the braking resistor is provided to the up escalator, thereby reducing the power consumption of the up escalator from the power grid. In addition, in order to prevent the equipment from being damaged by power impact due to the large voltage difference between the direct current busbars of the two escalators when the parallel busbars are turned on, the direct busbar parallel connection of the two escalator systems is conducted when the two escalator systems are in the state that the main contactors are disconnected, i.e. the two escalator systems are in the state of stopping. Therefore, the power impact caused by the voltage difference between the direct current busbars of the two escalators is avoided, and the reliability and safety of the entire up and down escalator equipment are improved.
[0051] In one of the embodiments, as shown in Figure 4 the power impact preventing escalator power saving device further comprises a safety box knob switch S connected in series with the direct current coil R1, which is used to disconnect the parallel connection between the first direct current busbar and the second direct current busbar before the first escalator system or the second escalator system is powered off.
[0052] In detail, when the safety box knob switch S and the direct current contact Z are both closed, the closing or opening of the auxiliary contact K does not affect the parallel connection between the first direct current busbar and the second direct current busbar. When the first escalator system or the second escalator system needs to be powered off alone, the parallel connection between the two direct current busbars needs to be disconnected. Therefore, the safety box knob switch S is used to disconnect the parallel connection between the first direct current busbar and the second direct current busbar before the first escalator system or the second escalator system is powered off.
[0053] In the embodiment, the safety box knob switch S effectively disconnects the parallel connection. In the case of power failure or power-off maintenance of the equipment, the direct current busbar parallel line is disconnected in an emergency or automatically, thereby reducing the negative mutual interference between the equipment and increasing the intervention approach of professional personnel to emergency matters.
[0054] In one of the embodiments, as shown in Figure 5 the power impact preventing escalator power saving device further comprises an indicating lamp D1 connected in parallel across the direct current coil R1, which is used to display whether the first direct current busbar and the second direct current busbar are connected in parallel according to the bright and dark states of the light.
[0055] In detail, when the indicator light D1 is in the on state, it indicates that the direct current coil R1 is in the energized state, at this time the first direct current bus and the second direct current bus are in parallel conduction. When the indicator light D1 is in the off state, it indicates that the direct current coil R1 is in the de-energized state, at this time the first direct current bus and the second direct current bus are not in conduction.
[0056] In this embodiment, the state of the parallel bus conduction is prompted by the indicator light, which can be monitored by multiple arrangements.
[0057] In one of the embodiments, as shown in Figure 6 The first escalator system A includes a main air switch linkage switch K1 in series with the direct current coil R1 in the anti-power impact escalator power saving device, which is used to close the main air switch linkage switch K1 to connect the first power supply L1 to the first escalator system A when the first main air switch is closed. Similarly, the second escalator system B also includes a main air switch linkage switch K2 in series with the direct current coil R1 in the anti-power impact escalator power saving device, which is used to close the main air switch linkage switch K2 to connect the second power supply L2 to the second escalator system B when the second main air switch is closed.
[0058] In this embodiment, the main air switch linkage switch K1 of the first escalator system A and the main air switch linkage switch K2 of the second escalator system B are in series with the direct current coil R1 in the anti-power impact escalator power saving device. When the first main air switch of the first escalator system A and the second main air switch of the second escalator system B are closed, the main air switch linkage switch K1 and the main air switch linkage switch K2 are closed to connect the first power supply L1 of the first escalator system and the second power supply L2 of the second escalator system to the normal power supply, and the auxiliary coil R2 is energized to generate a first electromagnetic force to control the auxiliary contact K to close. At this time, the direct current coil R1 is energized to generate a second electromagnetic force to control the direct current contact Z to close, ensuring that the two escalators are in parallel operation when not running.
[0059] It should be noted that if the first direct current bus and the second direct current bus are connected in parallel, the main air switch linkage switch K1 of the first escalator system A is disconnected, or the main air switch linkage switch K2 of the second escalator system B is disconnected, then the direct current coil R1 and the self-locking loop of the direct current contact Z' are disconnected, so that the first direct current bus and the second direct current bus are disconnected in parallel.
[0060] In one of the embodiments, as shown in Figure 7As shown, the first escalator system A further includes an auxiliary interlocking contact NC1, which is connected in series with the auxiliary coil R2 in the escalator power saving device for preventing power surges. When the first power supply L1 of the first escalator system A is normally energized and the first main contactor 102 is not closed, the auxiliary interlocking contact NC1 acts as a normally closed switch, which is then closed and conducted, energizing the auxiliary coil R2 to generate a first electromagnetic force. Similarly, the second escalator system B further includes an auxiliary interlocking contact NC2, which is connected in series with the auxiliary coil R2 in the escalator power saving device for preventing power surges. When the second power supply L2 of the second escalator system B is normally energized and the second main contactor is not closed, the auxiliary interlocking contact NC2 acts as a normally closed switch, which is closed and conducted, energizing the auxiliary coil R2 to generate a first electromagnetic force.
[0061] The first main contactor 102 and the auxiliary interlocking contact NC1 are interlocking switches, and the auxiliary interlocking contact NC1 is a normally closed switch. When the first main contactor 102 is open, the auxiliary interlocking contact NC1 is closed; when the first main contactor 102 is closed, the auxiliary interlocking contact NC1 is open. The second main contactor and the auxiliary interlocking contact NC2 function similarly.
[0062] In this embodiment, the auxiliary interlocking contact NC1 of the first escalator system A and the auxiliary interlocking contact NC2 of the second escalator system B are connected in series with the auxiliary coil R2 in the escalator power saving device for preventing power shocks, ensuring that when the first main contactor 102 and the second main contactor are not closed, that is, when the first escalator system A and the second escalator system B are not running, the auxiliary interlocking contact NC1, the auxiliary interlocking contact NC2 and the auxiliary coil R2 form a closed loop, and the auxiliary coil R2 is energized to generate a first electromagnetic force. By connecting the direct buses of the two escalator systems in parallel when both escalator systems are in the stopped state, power shocks caused by the voltage difference between the DC buses of the two escalators are avoided.
[0063] It should be noted that in the above embodiments of the present application, devices such as contactors, relays, and coils are only used to control the on and off of the circuits. Other devices or apparatuses with on and off control functions can also be used to achieve the same functions as in the embodiments of the present application.
[0064] In the description of this specification, reference to the terms "some embodiments" or "other embodiments" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
[0065] Any technical features in the above-described embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations are described, however, as long as the combinations of technical features do not result in contradictions, they shall be considered within the scope of the present disclosure.
[0066] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the scope of the present application. It shall be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims
1. A power surge protection escalator power saving device applied to up and down escalator equipment, the up and down escalator equipment comprising a first escalator system, a second escalator system, the first escalator system comprising a first DC bus, a first power supply L1, the second escalator system comprising a second DC bus, a second power supply L2; characterized in that, The escalator power saving device comprises a DC contactor and an auxiliary relay, the DC contactor comprises a DC contact Z and a DC coil R1, and the auxiliary relay comprises an auxiliary contact K and an auxiliary coil R2; One end of the auxiliary coil R2 is connected with a first power supply L1 or a second power supply L2, and the other end is connected with a common ground; one end of the auxiliary contact K is connected with the DC coil R1, and the other end of the auxiliary contact K is connected with the second power supply L2; the other end of the DC coil R1 is connected with the first power supply L1; one end of the DC contact Z is connected with the first DC bus, and the other end of the DC contact Z is connected with the second DC bus; When the first power supply L1 of the first escalator system and the second power supply L2 of the second escalator system are normally powered, the auxiliary coil R2 generates a first electromagnetic force to control the auxiliary contact K to be closed, and the DC coil R1 generates a second electromagnetic force to control the DC contact Z to be closed, so that the first DC bus and the second DC bus are connected in parallel.
2. The power surge protection escalator power saving device according to claim 1, wherein, The device further comprises: A safety box knob switch S connected in series with the DC coil R1, used to disconnect the parallel connection of the first DC bus and the second DC bus before the first escalator system or the second escalator system is powered off.
3. The power surge protection escalator power saving device according to claim 2, wherein, The device further comprises: An indicator light D1 connected in parallel across the DC coil R1, used to display whether the first DC bus and the second DC bus are connected in parallel according to the brightness of the light.
4. The power surge protection escalator power saving device according to claim 1, wherein, The DC contactor further comprises a DC contact Z', which is connected in series with the DC coil R1, one end of the DC contact Z' is connected with the first power supply L1, and the other end of the DC contact Z' is connected with the second power supply L2; The DC contact Z' is used to generate a second electromagnetic force by the DC coil R1 to control the DC contact Z and the DC contact Z' to be synchronously closed to form a self-locking loop.
5. The power surge protected escalator power saving device of claim 4, wherein, The auxiliary contact K is connected in parallel with the DC contact Z', when the DC contact Z and the DC contact Z' are synchronously closed to form a self-locking loop, the auxiliary contact K is closed or disconnected, and the DC coil R1 is powered to generate a second electromagnetic force.
6. An escalator apparatus, characterized by The first escalator system further comprises a first main air switch, 7. Stairway installation according to claim 6, characterized in that The first main air switch is connected with an external power supply voltage source and a first controller, used to access the external power supply voltage source to the first controller when closed, and convert the external power supply voltage source into the first power supply L1, wherein the first controller comprises a first rectifier module and a first inverter module, the first rectifier module is used to convert alternating current into direct current, the first inverter module is used to convert direct current into alternating current, and the first rectifier module and the first inverter module are connected through a first DC bus; And / or, the second escalator system further comprises a second main air switch, The second main air switch is connected with an external power supply voltage source and a second controller, and is used to connect the external power supply voltage source to the second controller when closed, and convert the external power supply voltage source into a second power supply L2. The second controller includes a second rectifier module and a second inverter module. The second rectifier module is used to convert alternating current into direct current. The second inverter module is used to convert direct current into alternating current. The second rectifier module is connected with the second inverter module through a second direct current bus.
8. Stairway installation according to claim 7, characterized in that The first escalator system includes a main air switch linkage switch K1 connected in series with a direct current coil R1, and used to be linked and closed to be turned on when the first main air switch is closed, so as to connect the first power supply L1 to the first escalator system. The second escalator system includes a main air switch linkage switch K2 connected in series with the direct current coil R1, and used to be linked and closed to be turned on when the second main air switch is closed, so as to connect the second power supply L2 to the second escalator system.
9. Stairway installation according to claim 7, characterized in that The first escalator system further includes a first main contactor and a first motor, The first main contactor is connected with the first controller and the first motor, and is used to be turned on according to a first signal sent by the first controller, so as to control the first motor to operate according to the first signal.
10. Stairway installation according to claim 9, characterized in that The first escalator system further includes an auxiliary linkage contact NC1 connected in series with the auxiliary coil R2, and used to be linked and closed to be turned on when the first power supply L1 of the first escalator system is normally powered and the first main contactor is not closed, so that the auxiliary coil R2 is powered to generate a first electromagnetic force.