Safety circuit fault feedback device and escalator

Abstract

The utility model relates to a safety circuit fault feedback device and an escalator. The safety circuit fault feedback device comprises a power supply, a motor power supply controller coil, a current detection unit, a processing unit and a plurality of safety switches, the safety switch comprises a contact acting according to the fault of the safety component; the plurality of contacts are connected in series with a motor power supply controller coil and a power supply to form a safety loop; each contact is correspondingly connected with a resistor, each resistor is connected in series between the corresponding contact and the current detection unit, the plurality of contacts are connected in series with the respective corresponding resistors, the power supply and the current detection unit to form a plurality of first loops, and the plurality of first loops are connected in parallel to form a fault feedback loop; and the processing unit is connected with the current detection unit and is used for positioning the acting contact according to the current value of the fault feedback loop transmitted by the current detection unit. The safety loop and the fault feedback loop share the same auxiliary contact, the acting contact is positioned through the current value, fault collection points do not need to be arranged for all the switches, and the problem that the fault feedback cost is high is solved.

Description

Technical Field

[0001] The present application relates to the technical field of elevators, and in particular to a safety circuit fault feedback device and an escalator. Background Art

[0002] In special equipment such as elevators and escalators, there are a large number of safety switches, which are connected in series to form a safety circuit. The main function of the safety circuit is to ensure that the elevator and escalator can only operate when the safety circuit is connected. When any safety component fails or an abnormal situation occurs, the corresponding safety switch will be disconnected, causing the safety relay to lose power and release, thereby cutting off the power supply and stopping the elevator and escalator. This can effectively prevent the elevator and escalator from continuing to operate when a fault occurs, ensuring safe and stable operation.

[0003] In order to quickly locate the operating safety switch, the existing technology is to feed back the operating status of all safety switches to an independent data collection point through an independent fault feedback cable. This solution requires setting up a large number of data collection points and related cables, resulting in increased fault feedback costs.

[0004] With regard to the problem of high cost of fault feedback in related technologies, no effective solution has been proposed so far. Utility Model Content

[0005] Based on this, it is necessary to provide a safety loop fault feedback device and escalator that can reduce the fault feedback cost in response to the above technical problems.

[0006] In a first aspect, a safety circuit fault feedback device is provided in this embodiment, including: a power supply, a motor power supply controller coil, a current detection unit, a processing unit, and a plurality of safety switches; the safety switch includes a contact that operates according to a safety component fault;

[0007] A plurality of the contacts are connected in series with the motor power controller coil and the power supply to form a safety circuit;

[0008] Each of the contacts is connected to a resistor.

[0009] Each resistor is connected in series between the corresponding contact and the current detection unit, a number of contacts and their corresponding resistors, the power supply, and the current detection unit are connected in series to form a number of first loops, and a number of the first loops are connected in parallel to form a fault feedback loop;

[0010] The processing unit is connected to the current detection unit and is used to locate the contact point where the action occurs according to the current value of the fault feedback loop transmitted by the current detection unit.

[0011] In some of the embodiments, in the fault feedback loop, one end of the resistor is connected to one end of the corresponding contact, the other end of the resistor is connected to the input end of the current detection unit, the output end of the current detection unit is connected to one end of the power supply, and the other end of the power supply is connected to the other end of the contact.

[0012] In some of the embodiments, in the safety circuit, one end of a plurality of the contacts connected in series is connected to one end of the power source, and the other end is connected to one end of the motor power controller coil;

[0013] The other end of the motor power controller coil is connected to the other end of the power supply.

[0014] In some of the embodiments, the safety switch is arranged corresponding to the safety component.

[0015] In some of the embodiments, the contact is a normally closed contact.

[0016] In some embodiments, the resistance values ​​of the resistors are fixed and equal.

[0017] In some of the embodiments, the processing unit stores a preset relationship between the current value in the fault feedback loop and the contact action;

[0018] The processing unit is used to locate the contact point where the action occurs according to the current value of the fault feedback loop transmitted by the current detection unit and the preset relationship.

[0019] In some of the embodiments, it also includes:

[0020] An alarm unit is connected to the safety circuit and is used to issue an alarm when the safety circuit is disconnected.

[0021] In a second aspect, an escalator is provided in this embodiment, comprising the safety circuit fault feedback device as described in the first aspect.

[0022] In some of the embodiments, a safety switch in the safety circuit fault feedback device is provided at the handrail entrance, and / or the comb plate, and / or the drive chain of the escalator.

[0023] Compared with the related art, the safety circuit fault feedback device and escalator provided in this embodiment include: a power supply, a motor power supply controller coil, a current detection unit, a processing unit and several safety switches; the safety switch includes a contact that acts according to the fault of the safety component; several of the contacts are connected in series with the motor power supply controller coil and the power supply to form a safety circuit; each of the contacts is connected with a resistor, each of the resistors is connected in series between the corresponding contact and the current detection unit, several of the contacts are connected in series with the respective corresponding resistors, the power supply and the current detection unit to form several first circuits, and several of the first circuits are connected in parallel to form a fault feedback circuit; the processing unit is connected with the current detection unit to locate the contact that is in action according to the current value of the fault feedback circuit transmitted by the current detection unit. Through this embodiment, the safety circuit and the fault feedback circuit share the same auxiliary contact, and the safety switch that is in action is located by the current value in the fault feedback circuit, without the need to set a fault collection point and related cables for each switch, simplifying the circuit structure and solving the problem of high cost of fault feedback.

[0024] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 is a schematic diagram of the structure of a safety circuit fault feedback device in one embodiment;

[0027] Figure 2 is a schematic diagram of the structure of a safety circuit fault feedback device under a certain contact action in an embodiment;

[0028] Figure 3 It is a simplified structural diagram of a safety circuit fault feedback device under a certain contact action condition in one embodiment;

[0029] Figure 4 It is a schematic diagram of the structure of the minimum detection unit in an embodiment. DETAILED DESCRIPTION

[0030] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0031] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the", "these" and the like in this application do not represent quantitative restrictions, and they can be singular or plural. The terms "include", "comprise", "have" and any variants thereof involved in this application are intended to cover non-exclusive inclusions; for example, a process, method and system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether directly or indirectly. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. Usually, the character " / " indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0032] In special equipment such as elevators and escalators, there are a large number of safety switches, which are connected in series to form a safety circuit. The main function of the safety circuit is to ensure that the elevator and escalator can only operate when the safety circuit is connected. When any safety component fails or an abnormal situation occurs, the corresponding safety switch will be disconnected, causing the safety relay to lose power and release, thereby cutting off the power supply and stopping the elevator and escalator. This can effectively prevent the elevator and escalator from continuing to operate when a fault occurs, ensuring safe and stable operation.

[0033] The safety circuit in an elevator is mainly composed of safety switches distributed in the machine room, landing station, car and shaft; the safety circuit in an escalator is mainly composed of safety switches distributed in the truss. In order to quickly locate the operating safety switch, the existing technology is to feed back the operating status of all safety switches to an independent data collection point through an independent fault feedback cable. This solution requires the installation of a large number of data collection points and related cables, which increases the cost of fault feedback.

[0034] In this embodiment, a safety circuit fault feedback device is provided. Figure 1 is a schematic diagram of the structure of the safety circuit fault feedback device in this embodiment. Figure 1As shown, the device includes: a power supply, a motor power controller coil SW, a current detection unit, a processing unit and a plurality of safety switches (SW 1 , SW 2 ,……,SW n ); the safety switch includes contacts that operate in response to a safety component failure;

[0035] The contacts of each safety switch are connected in series with the motor power controller coil and the power supply to form a safety circuit;

[0036] Each contact is connected to a resistor (R1, R2, ..., R n ), each resistor is connected in series between the corresponding contact and the current detection unit, a number of contacts and their respective corresponding resistors, power supplies, and current detection units are connected in series to form a number of first loops, and a number of first loops are connected in parallel to form a fault feedback loop;

[0037] The processing unit is connected to the current detection unit and is used to locate the contact point where the action occurs according to the current value of the fault feedback loop transmitted by the current detection unit.

[0038] The power supply can be a voltage stabilizer, which is a voltage stabilizer that adds a voltage stabilization mechanism to a common power supply. Its main function is to provide a stable output voltage. This stabilization mechanism can be a simple voltage divider circuit or a complex electronic regulator.

[0039] The motor power controller coil SW controls the on / off of the motor power supply and the current to achieve the drive control of the escalator or elevator motor. When the escalator or elevator needs to be started or stopped, the controller will send instructions to the motor power controller coil to control the action of the coil and then control the operation of the motor. In addition, when the safety circuit is disconnected, the motor power controller coil SW loses power and the motor stops running accordingly.

[0040] The safety switch can be a safety relay, which is set corresponding to the safety components in the escalator or elevator, including contacts that operate according to the failure of the safety components. When the electromagnetic coil is activated, the pair of contacts will open or close the circuit, thereby realizing the function of the safety switch. In the safety switch, the contacts are divided into normally open contacts and normally closed contacts. Among them, the contacts that are in the open state under normal conditions (not activated) are called normally open contacts; the contacts that are in the closed state under normal conditions are called normally closed contacts. The working principle of the safety relay is to control the movement of the armature through electromagnetic induction, thereby driving the moving contact of the armature and the static contact (normally open contact or normally closed contact) to attract or release, so as to achieve the purpose of conducting or cutting off the circuit.

[0041] The device includes a safety circuit and a fault feedback circuit. Among them, the safety circuit is formed by the contacts in the safety switch, the motor power controller coil SW and the power supply in series. Under normal circumstances without faults, the power supply supplies power to the motor power controller coil SW, and the escalator or elevator operates normally. When the safety component fails, the safety circuit is disconnected, the motor power controller coil SW loses power, and the escalator or elevator stops running, ensuring safe operation.

[0042] Each contact has a corresponding resistor (R 1 , R 2 ,……,R n ), the resistor is connected in series between the corresponding contact and the current detection power supply, and the contacts in the safety switches and the corresponding resistors, current detection units and power supplies are connected in series to form a plurality of first loops, and the plurality of first loops are connected in parallel to form a fault feedback loop. Among them, the power supply provides a stable voltage for the safety switch and the corresponding resistor, and the current detection unit is used to detect the current value in the fault feedback circuit and transmit the current value to the processing unit.

[0043] The processing unit is connected to the current detection unit, and determines the action state of the safety switch according to the current value in the fault feedback circuit, locates the position of the contact where the action occurs, and thus determines the faulty safety component according to the safety switch.

[0044] Through the device provided in this embodiment, the current value in the fault feedback loop is used to locate the safety switch that has taken action, and there is no need to set up a fault collection point and related cables for each switch, which simplifies the circuit structure and thus saves the cost of fault feedback. At the same time, the safety loop and the fault feedback loop share the contacts of the same pair of safety switches, which not only saves the use of contacts, but also reduces the number of related cable cores. Such a structure is simpler and more conducive to manufacturing and installation.

[0045] Furthermore, since there is no need to connect all the contacts of the safety switches in series in the control cabinet via cables to form a safety circuit, the safety switches can be connected in series in the truss to form a safety circuit, thereby reducing the number of cables in the upper and lower machine rooms and trusses, making the wiring in the upper and lower machine rooms and trusses simpler and reducing safety hazards.

[0046] In some of the embodiments, the safety switch is provided corresponding to the safety component.

[0047] Among them, the safety switch is the detection element corresponding to the safety component. It uses the internal contact mechanism to continuously monitor the status of the safety component and trigger corresponding safety measures.

[0048] In some of the embodiments, in the safety circuit, one end of a plurality of contacts connected in series is connected to one end of a power source, and the other end is connected to one end of a motor power controller coil;

[0049] The other end of the motor power controller coil is connected to the other end of the power supply.

[0050] Specifically, in this embodiment, the contact is a normally closed contact, and under normal conditions, the contact does not move, that is, remains in a closed state. Figure 1 As shown, under normal circumstances without faults, the contacts do not move and remain closed, the safety circuit is closed, the power supply supplies power to the motor power controller coil SW, and the escalator or elevator operates normally.

[0051] Figure 2 FIG. 1 is a schematic diagram of the structure of the safety circuit fault feedback device under the condition of a certain contact action in this embodiment. Figure 2 As shown, when a safety component fails, a safety switch (SW 3 ) contact is actuated, the contact is in the disconnected state, the safety circuit is disconnected, the motor power controller coil SW loses power, and the escalator or elevator stops running to ensure safe operation.

[0052] In some of the embodiments, in the fault feedback loop, one end of the resistor is connected to one end of the corresponding contact, the other end of the resistor is connected to the input end of the current detection unit, the output end of the current detection unit is connected to one end of the power supply, and the other end of the power supply is connected to the other end of the contact.

[0053] Specifically, in this embodiment, the contact is a normally closed contact, and under normal conditions, the contact does not move, that is, remains in a closed state. Figure 1 As shown, under normal circumstances without faults, the contacts do not move and remain closed, and the positive pole of the power supply is connected to the safety switch, which is a safety switch (SW 1 , SW 2 ,……,SW n ) and the corresponding resistance (R 1 , R 2 ,……,R n ) provides a stable voltage, each resistor is connected in parallel, and the current value of each resistor in parallel in the fault feedback circuit is detected by the current detection unit, and the current value is transmitted to the processing unit. In this embodiment, the resistors are fixed value resistors with equal resistance values, so that the current value passing through the resistors is a fixed value, such as 0.001A or 0.002A, etc., to simplify the calculation.

[0054] like Figure 2 As shown, when a safety component fails, a safety switch (SW 3 ) contact is in the open state. Figure 3 FIG. 1 is a simplified structural diagram of a safety circuit fault feedback device under a certain contact action in this embodiment, such as Figure 3 As shown, in the fault feedback loop, the resistor R 1 and resistor R2 Parallel, power supply is safety switch (SW 1 and SW 2 ) and the corresponding resistance (R 1 and R 2 ) provides a stable voltage and detects the resistance R in the fault feedback circuit through the current detection unit 1 and resistor R 2 The current value is connected in parallel and transmitted to the processing unit.

[0055] In some of these embodiments, Figure 4 is a schematic diagram of the structure of the minimum detection unit in this embodiment, such as Figure 4 As shown, by the safety switch SW n And the corresponding resistance R n The series circuit composed of two components serves as the smallest detection unit in the device.

[0056] In some of the embodiments, the processing unit stores a preset relationship between the current value and the contact action in the fault feedback loop;

[0057] The processing unit is used to locate the contact point where the action occurs according to the current value of the fault feedback loop transmitted by the current detection unit and the preset relationship.

[0058] Specifically, the corresponding current value when each safety switch fails (i.e., the corresponding contact is disconnected) is preset to form a preset relationship between the current value and the contact action in the fault feedback loop, and is stored in the processing unit. In the processing unit, the contact that has been actuated is determined based on the detected current value in the fault feedback loop and the stored preset relationship, so that the faulty safety switch can be quickly determined and false fault alarms can be reduced.

[0059] In some of the embodiments, the device further comprises: an alarm unit connected to the safety circuit and configured to generate an alarm when the safety circuit is disconnected.

[0060] Specifically, the alarm unit can be a voice alarm, an audible and visual alarm, etc. When the contact is disconnected, the safety circuit is disconnected, the motor power controller coil SW loses power, and the escalator or elevator stops running to ensure safe operation. At the same time, the alarm unit is triggered to issue a timely warning.

[0061] In some of the embodiments, the processing unit may also be connected to a fault display device.

[0062] When the processing unit determines the contact that has been actuated based on the current value in the detected fault feedback loop and the stored preset relationship, and quickly identifies the faulty safety switch, the operating status of the escalator or elevator can be monitored in real time in the machine room through the fault display device. Once the equipment fails or is abnormal, a warning signal can be quickly issued to help administrators detect and deal with the problem in a timely manner.

[0063] The present embodiment is described and illustrated below through preferred embodiments.

[0064] In this embodiment, a safety circuit fault feedback device is provided, such as Figure 1 As shown, the device includes: a power supply, a motor power controller coil SW, a current detection unit, a processing unit and a plurality of safety switches (SW 1 , SW 2 ,……,SW n ); The safety switch includes contacts that operate in response to a safety component failure.

[0065] Each contact is connected in series with the motor power controller coil SW and the power supply to form a safety circuit, in which several safety switches (SW 1 , SW 2 ,……,SW n ) One end of the contacts connected in series is connected to the positive pole of the power supply, and the other end is connected to one end of the motor power controller coil; the other end of the motor power controller coil is connected to the negative pole of the power supply.

[0066] Each contact is connected to a resistor (R 1 , R 2 ,……,R n ), each resistor is connected in series between the corresponding contact and the current detection unit, and several contacts and their corresponding resistors, power supplies, and current detection units are connected in series to form several first loops, and several first loops are connected in parallel to form a fault feedback loop. 1 One end of the safety switch SW 1 One end of the middle contact is connected to the resistor R 1 The other end is connected to the input end of the current detection unit, the output end of the current detection unit is connected to the negative pole of the power supply, and the positive pole of the power supply is connected to the safety switch SW 1 The other end of the middle contact is connected in series to form the first circuit; the resistor R 2 One end of the safety switch SW 2 One end of the middle contact is connected to the resistor R 2 The other end is connected to the input end of the current detection unit, the output end of the current detection unit is connected to the negative pole of the power supply, and the positive pole of the power supply is connected to the safety switch SW 2 The other end of the middle contact is connected in series to form the first circuit; the resistor R 3 One end of the safety switch SW 3 One end of the middle contact is connected to the resistor R 3 The other end is connected to the input end of the current detection unit, the output end of the current detection unit is connected to the negative pole of the power supply, and the positive pole of the power supply is connected to the safety switch SW 3 The other end of the middle contact is connected in series to form the first circuit; the resistor Rn The other end is connected to the input end of the current detection unit, the output end of the current detection unit is connected to the negative pole of the power supply, and the positive pole of the power supply is connected to the safety switch SW n The other end of the middle contact is connected to form a first circuit in series. Several first circuits are connected in parallel to form a fault feedback circuit. The safety switch (SW 1 , SW 2 ,……,SW n ) are connected in series.

[0067] The processing unit stores the preset relationship between the current value in the fault feedback loop and the contact action; the processing unit is connected to the current detection unit and is used to locate the contact that has acted according to the current value of the fault feedback loop transmitted by the current detection unit and the preset relationship. In this embodiment, the following preset relationship is specifically set: For example, when the current value of the fault feedback loop I=I R1 When the corresponding safety switch SW 2 Fault, when the current value is I=I R1 +I R2 When the corresponding safety switch SW 3 Fault, when the current value is I=I R1 +I R2 +I R3 When the corresponding safety switch SW 4 Failure, and so on.

[0068] In one embodiment, the resistor R 1 , R 2 ,……,R n The resistance value of the fault feedback loop is set to I = I R1 =A, the corresponding fault point is SW 2 ; When the current value is set to I = 2A, the corresponding fault point is SW 3 ; When the current value is set to I = 3A, the corresponding fault point is SW 4 , and so on for more preset relationships.

[0069] Under normal conditions without any faults, such as Figure 1 As shown, the contact does not move and remains closed, the safety circuit is closed, the power supply is the motor power controller coil SW, and the escalator or elevator operates normally. In the fault feedback loop, the power supply is the safety switch (SW 1 , SW 2 ,……,SW n ) and the corresponding resistance (R 1 , R 2 ,……,R n) provides a stable voltage, the resistors are connected in parallel, and the current value of all the resistors in parallel in the fault feedback circuit is detected by the current detection unit, and the current value is transmitted to the processing unit.

[0070] In case of safety component failure, such as Figure 2 As shown, the corresponding safety switch (SW 3 ) contact is in the disconnected state, the safety circuit is disconnected, the motor power controller coil SW loses power, and the escalator or elevator stops running to ensure safe operation. In the fault feedback loop, the resistor R 1 and resistor R 2 Parallel, power supply is safety switch (SW 1 and SW 2 ) and the corresponding resistance (R 1 and R 2 ) provides a stable voltage and detects the resistance R in the fault feedback circuit through the current detection unit 1 and resistor R 2 The current value of the parallel connection is transmitted to the processing unit. 2 ) contact is actuated, the contact is in the disconnected state, the safety circuit is disconnected, the motor power controller coil SW loses power, and the escalator or elevator stops running to ensure safe operation. At this time, a resistor R is connected in series in the fault feedback loop 1 , power supply is safety switch SW 1 And the corresponding resistance R 1 Provides a stable voltage and detects the resistance R in the fault feedback circuit through the current detection unit 1 The current value is obtained and transmitted to the processing unit.

[0071] Through the device provided in this embodiment, the current value in the fault feedback loop is used to quickly locate the safety switch that has been actuated, and there is no need to set up a fault collection point and related cables for each switch, thereby saving the cost of fault feedback and reducing false fault reports. At the same time, the safety loop and the fault feedback loop share the contacts of the same pair of safety switches, which not only saves the use of contacts, but also reduces the number of related cable cores. Such a structure is simpler and more conducive to production and installation.

[0072] Furthermore, since there is no need to connect all the contacts of the safety switches in series in the control cabinet via cables to form a safety circuit, the safety switches can be connected in series in the truss to form a safety circuit, thereby reducing the number of cables in the upper and lower machine rooms and trusses, making the wiring in the upper and lower machine rooms and trusses simpler and reducing safety hazards.

[0073] In this embodiment, an escalator is also provided, comprising the safety circuit fault feedback device provided in the above embodiments.

[0074] The safety circuit fault feedback device in the escalator can ensure the safe operation of the escalator and help quickly locate the faulty safety switch in the escalator, improve maintenance efficiency, reduce maintenance costs, and avoid safety accidents caused by further development of the fault.

[0075] In some of the embodiments, a safety switch in a safety circuit fault feedback device is provided at the handrail entrance of the escalator, and / or in the comb plate, and / or in the drive chain.

[0076] Specifically, the safety switch at the entrance of the handrail is located at the entrance of the handrail into the escalator system, and is used to detect whether the handrail is operating normally; the safety switch in the comb plate area of ​​the escalator is used to detect whether the gap between the comb plate and the steps is normal; the safety switch near the drive chain is used to detect whether the drive chain is operating normally to avoid the escalator from stopping or reversing due to a break or jam of the drive chain. In addition, the escalator may also be equipped with safety switches for other safety components, such as emergency stop buttons, anti-pinch devices, anti-reversal devices and other safety components.

[0077] It should be understood that the specific embodiments described herein are only used to explain the application, rather than to limit it. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of this application.

[0078] Obviously, the drawings are only some examples or embodiments of the present application. For ordinary technicians in the field, the present application can also be applied to other similar situations based on these drawings without creative work. In addition, it is understandable that although the work done in this development process may be complicated and lengthy, for ordinary technicians in the field, certain changes in design, manufacturing or production based on the technical content disclosed in this application are only conventional technical means and should not be regarded as insufficient content disclosed in this application.

[0079] The term "embodiment" in this application refers to a specific feature, structure or characteristic described in conjunction with the embodiment that can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. It is clearly or implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.

[0080] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of patent protection. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the attached claims.

Claims

1. A safety circuit fault feedback device, characterized in that: include: A power supply, a motor power controller coil, a current detection unit, a processing unit, and a number of safety switches; the safety switches include contacts that operate according to safety component failures; A plurality of the contacts are connected in series with the motor power controller coil and the power supply to form a safety circuit; Each of the contacts is connected to a resistor. Each resistor is connected in series between the corresponding contact and the current detection unit, a number of contacts and their corresponding resistors, the power supply, and the current detection unit are connected in series to form a number of first loops, and a number of the first loops are connected in parallel to form a fault feedback loop; The processing unit is connected to the current detection unit and is used to locate the contact point where the action occurs according to the current value of the fault feedback loop transmitted by the current detection unit.

2. The safety circuit fault feedback device according to claim 1, characterized in that: In the fault feedback loop, one end of the resistor is connected to one end of the corresponding contact, the other end of the resistor is connected to the input end of the current detection unit, the output end of the current detection unit is connected to one end of the power supply, and the other end of the power supply is connected to the other end of the contact.

3. The safety circuit fault feedback device according to claim 1, characterized in that: In the safety circuit, one end of a plurality of contacts connected in series is connected to one end of the power supply, and the other end is connected to one end of the motor power controller coil; The other end of the motor power controller coil is connected to the other end of the power supply.

4. The safety circuit fault feedback device according to claim 1, characterized in that: The safety switch is arranged corresponding to the safety component.

5. The safety circuit fault feedback device according to claim 1, characterized in that: The contact is a normally closed contact.

6. The safety circuit fault feedback device according to claim 1, characterized in that: The resistance values ​​of the resistors are fixed and equal.

7. The safety circuit fault feedback device according to claim 1, characterized in that: The processing unit stores a preset relationship between the current value in the fault feedback loop and the contact action; The processing unit is used to locate the contact point where the action occurs according to the current value of the fault feedback loop transmitted by the current detection unit and the preset relationship.

8. The safety circuit fault feedback device according to claim 1, characterized in that: Also includes: An alarm unit is connected to the safety circuit and is used to issue an alarm when the safety circuit is disconnected.

9. An escalator, characterized in that: It comprises the safety circuit fault feedback device as claimed in any one of claims 1 to 8.

10. The escalator according to claim 9, characterized in that: The safety switch in the safety circuit fault feedback device is arranged at the handrail entrance of the escalator, and / or the comb plate, and / or the driving chain.

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