Escalator sensor emergency stop device

Abstract

An escalator sensing emergency stop device includes a controller and an emergency stop sensor belt arranged on the escalator, wherein the controller includes a first relay, a second relay, a first relay control circuit and a second relay control circuit, and the first relay contact and the second relay contact are connected in series to the power supply circuit of the driving mechanism of the escalator; the emergency stop sensor belt includes a first contact terminal and a second contact terminal that maintain a set distance under normal conditions, and under normal conditions, the first relay control circuit and the second relay control circuit drive the first relay and the second relay to close the contact of the first relay and the contact of the second relay, and under emergency conditions, an external force causes the first contact terminal and the second contact terminal to contact, and the first relay control circuit and the second relay control circuit drive the first relay and the second relay to open the contact of the first relay and / or the normal contact of the second relay, thereby stopping the escalator. The escalator sensing emergency stop device provided by the present invention is easy to use, has reliable performance, can self-diagnose device failures, and can be controlled anywhere within the entire length of the escalator to ensure the personal safety of passengers in the event of an accident.

Description

Technical Field

[0001] The invention relates to an escalator sensor emergency stop device, and in particular to a safe and reliable escalator sensor emergency stop device which is easy to use, reliable in performance, capable of self-diagnosing device failures and can be operated anywhere within the entire length of the escalator. Background Art

[0002] The emergency stop button of the existing escalator is an emergency stop button installed at the top or bottom of the escalator. When the passengers on the escalator are in danger due to an accident, the passengers are too far away from the emergency stop button and cannot touch the emergency stop button. The escalator cannot stop quickly, resulting in personal injury caused by the passengers falling.

[0003] The Chinese utility model patent with announcement number CN 205709419U discloses a safety protection device on an escalator, which includes a pull rope and a pull rope switch. The pull rope extends along the length direction of the escalator and is arranged below the steps or pedals. One end of the pull rope is fixed and the other end is connected to the pull rope switch. The pull rope switch is provided with a touch component for connecting the pull rope and driving the switch contact to move. The stroke of the touch component has a pull-out trigger section, a normal working section and a retracted trigger section from the inside to the outside. When the steps or pedals are in a sunken state, the pull rope is pressed down to pull the touch component out to the pull-out trigger section, and the pull rope switch is triggered to send a signal to stop the escalator; when the escalator is in a normal working state, the touch component is located in the normal working section, and the pull rope switch is not triggered; when the pull rope breaks, the touch component retracts inward to the retracted trigger section, and the pull rope switch is triggered to send a signal to stop the escalator.

[0004] The Chinese utility model patent with announcement number CN 206590751U discloses a power-off escalator safety protection device and an escalator, which includes a power-off conductive plate and a connecting plate, which are arranged at the lower part of the handrail along the length direction of the escalator, and the upper and lower circuits of the conductive plate are electrically connected to the contacts of the upper and lower emergency stop buttons of the escalator respectively. When an accident occurs to a person riding the escalator, he or she can directly smash the power-off conductive plate with his or her hands or feet to cut off the escalator control circuit, thereby achieving the purpose of controlling the escalator to stop suddenly and protecting the passengers from being injured by the escalator.

[0005] In Patent Document 1, although the safety protection device can realize full-range detection of the steps or pedals of the escalator and can effectively protect the lives of passengers in case of an emergency with the steps or pedals, the device cannot stop the escalator at all in the event of emergencies such as a shopping cart slipping, people falling while playing or other emergencies, and the body may be scratched on the steps or pedals many times, thus causing personal safety accidents.

[0006] The safety protection device mentioned in Patent Document 2 can achieve full control of the escalator during operation. Once the passengers encounter an emergency, the escalator can be emergency braked by breaking the conductive plate to achieve personal protection. However, on the one hand, an emergency may only occur in a very quick moment, and the passengers' reactions are limited; on the other hand, the emergency stop switch is triggered only by breaking the conductive plate, and the breaking force is relatively large. In critical situations, people's autonomous awareness will be reduced, so its disadvantages are also more obvious. Another problem is that its structure is complex, the manufacturing cost is high, and it is a disposable product with high use and maintenance costs. Therefore, the problems that need to be solved are also great. Summary of the invention

[0007] In order to solve the technical defect that the existing escalators cannot effectively avoid accidents, the purpose of the present invention is to provide a safe and reliable escalator sensor emergency stop device which is easy to use, reliable in performance, can self-diagnose device failures and can be operated anywhere within the entire length of the escalator, so as to ensure the personal safety of passengers in the event of an accident.

[0008] To achieve the above-mentioned purpose, the present invention provides an escalator sensing emergency stop device, which includes a controller, characterized in that it also includes an emergency stop sensor belt arranged on the escalator, the controller includes a first relay, a second relay, a first relay control circuit and a second relay control circuit, the first relay contact and the second relay contact are connected in series to the power supply circuit of the driving mechanism of the escalator; the emergency stop sensor belt includes a first contact terminal and a second contact terminal that maintain a set distance under normal conditions, under normal conditions, the first relay control circuit and the second relay control circuit drive the first relay and the second relay to close the contacts of the first relay and the second relay, in an emergency, an external force causes the first contact terminal and the second contact terminal to contact, the first relay control circuit and the second relay control circuit drive the first relay and the second relay to open the contacts of the first relay and / or the normal contacts of the second relay, thereby stopping the escalator.

[0009] Preferably, the relay control circuit includes a sampler, which includes at least a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series and connected between a power supply and a ground, and an intermediate node thereof provides a signal to the first relay drive circuit and the second relay drive circuit; and both ends of the first resistor are respectively connected to a first contact terminal and a second contact terminal.

[0010] Preferably, the relay control circuit includes an emergency stop detector, which includes a first comparator, which includes a first operational amplifier IC1, a third resistor R9 and a fourth resistor R8, wherein the third resistor R9 is connected between the output terminal and the non-inverting terminal of the first operational amplifier, the output terminal of the sampler is connected to the non-inverting terminal of the first operational amplifier via the fourth resistor R8, and the first reference voltage is connected to the inverting terminal of the first operational amplifier.

[0011] Preferably, the relay control circuit includes a fault detector, which includes a second operational amplifier IC2, a fifth resistor R11 and a sixth resistor R10, wherein the fifth resistor R11 is connected between the output terminal and the non-inverting terminal of the second operational amplifier, the output terminal of the sampler is connected to the inverting terminal of the second operational amplifier, the second reference voltage is connected to the non-inverting terminal of the second operational amplifier via the sixth resistor R10, and the first reference voltage is lower than the second reference voltage.

[0012] Preferably, the relay control circuit also includes an "AND gate" circuit, which includes a first diode D1, a second diode D2, a seventh resistor R12 and an eighth resistor R14, wherein the cathode of the first diode D1 is connected to the output end of the first comparator, and the anode is connected to the power supply via the seventh resistor R12 and the eighth resistor R14; the cathode of the second diode D2 is connected to the output end of the second comparator, and the anode is connected to the power supply via the seventh resistor R12 and the eighth resistor R14.

[0013] Preferably, the relay control circuit also includes a drive circuit and a self-locking circuit. When the output of the "AND gate" circuit is a low level, the drive circuit controls the relay to disconnect its contacts. Regardless of whether the output of the "AND gate" circuit is a high or low level, the self-locking circuit controls the relay through the drive circuit to keep its contacts disconnected.

[0014] Preferably, the driving circuit comprises a first transistor (Q1), the output end of the "AND gate" circuit is connected to the base of the first transistor, the emitter of the first transistor is grounded via an eighth resistor, and the collector is connected to the power supply via the coil of the first relay.

[0015] Preferably, the self-locking circuit includes a second transistor (Q2), a ninth resistor (R17) and a tenth resistor (R18), wherein the emitter of the second transistor is grounded, the collector is connected to the base of the first transistor, the first end of the ninth resistor is connected to the power supply via the coil of the first relay, and the second end is connected to the base of the second transistor; the first end of the tenth resistor is connected to the base of the second transistor, and the second end is connected to the ground.

[0016] Preferably, the emergency stop sensor belt is installed on the lower side plate of the escalator handrail, the apron plate, the handrail belt inlet and / or the upper and lower handrails of the escalator to prevent children from falling.

[0017] Preferably, the first contact terminal and the second contact terminal are made of a flexible conductive material made of a carbon material.

[0018] Compared with the existing escalator safety emergency stop technology, the escalator sensor emergency stop device provided by the present invention can achieve the following beneficial effects: A: The escalator can be braked at any position of the escalator to prevent accidents from harming passengers. B: When the safety flexible sensor protection belt is broken or short-circuited, the safety controller will issue a fault command to ensure the reliable operation of this safety protection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional schematic diagram of the emergency stop sensor belt provided by the present invention;

[0020] Figure 2 It is a schematic diagram of the installation position of the emergency stop sensor belt provided by the present invention on the escalator;

[0021] Figure 3 It is a schematic diagram of the push-button emergency stop sensor belt provided by the present invention;

[0022] Figure 4 It is a circuit diagram of the controller of the escalator sensor emergency stop device provided by the present invention;

[0023] Figure 5 The present invention provides a control flow chart of the escalator sensor emergency stop device. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be an electrical connection, a direct connection, an indirect connection through an intermediate medium, or the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Figure 1 is a cross-sectional schematic diagram of the emergency stop sensor belt provided by the present invention, such as Figure 1 As shown, according to one embodiment of the present invention, the emergency stop sensor belt includes an elastic shell 1 extending along a first direction X and a first contact terminal 2 and a second contact terminal 3 arranged on the upper surface and the lower surface of the shell and extending along the first direction, wherein the first contact terminal 2 and the second contact terminal 3 protrude relative to each other, the first contact terminal 2 is connected to an external circuit through a wire 5, and the second contact terminal 3 is connected to an external circuit through a wire 4. Figure 1 The first direction is a direction extending front to back.

[0028] According to an embodiment of the present invention, the cross-sections of the first contact terminal 2 and the second contact terminal 3 along the second direction Y and the third direction Z are at least partially triangular. The first direction X, the second direction Y and the third direction Z are in a right-handed coordinate system.

[0029] The first contact terminal 2 and the second contact terminal 3 are made of a flexible conductive material made of carbon nanomaterials. When not under stress, the first contact terminal 2 and the second contact terminal 3 are separated by a set distance, and a cavity is formed between the first contact terminal and the second contact terminal. When under stress, the first contact terminal 2 and the second contact terminal 3 are electrically connected. When in use, the shell of the emergency stop sensor belt is adhered to the supporting surface through the adhesive layer 15.

[0030] Figure 2 FIG. 1 is a schematic diagram of the installation position of the emergency stop sensor belt provided by the present invention on the escalator. Figure 2 As shown, the emergency stop sensor belt can be installed on the inner side plate 11 under the escalator handrail, such as a push-button emergency stop sensor belt; the emergency stop sensor belt can also be installed on the apron plate part 12, such as a push-button emergency stop sensor belt; the emergency stop sensor belt can also be installed on the handrail entrance guard plate 13 to prevent children from falling; the emergency stop sensor belt can also be installed on the handrail entrance guard plate 14 to prevent foreign objects or people from being pinched. The escalator manufacturer can determine the setting and installation type of the emergency stop sensor belt according to the actual installation occasion and requirements.

[0031] Figure 3 Schematic diagram of the push-button emergency stop sensor belt provided by the present invention, such as Figure 3As shown, according to one embodiment, a button-type emergency stop sensor belt is arranged at a corresponding position of the escalator 6. A plurality of openings are evenly arranged along the first direction on the escalator side wall 6, and a support groove 7 for accommodating the emergency stop sensor belt is arranged along the first direction. The emergency stop sensor belt is adhered to the surface in the support groove through an adhesive layer 15. The parts extending outward from the upper sides of the two sides of the support groove 7 are fixed to the edges of the openings. A plurality of openings are used to set a button assembly, and the button assembly includes a button bracket 9, an elastic button 8 and an acrylic button protective window 10. The button bracket 9 is arranged in the opening to support the elastic button 8. Normally, the lower part of the elastic button 8 is in contact with the emergency stop sensor belt 1, and the button protective window 10 is arranged on the upper part of the elastic button 8. In an emergency, the user breaks the button protective window 10 and further presses the elastic button 8 to make the first contact terminal 2 and the second contact terminal 3 of the emergency stop sensor belt electrically contact.

[0032] Figure 4 The present invention provides a circuit diagram of the controller of the escalator sensor emergency stop device. Figure 4 As shown, the controller includes a first relay J1, a second relay J2, a first relay control circuit and a second relay control circuit. The contact K1 of the first relay J1 and the contact K2 of the second relay are connected in series to the power supply circuit of the driving mechanism of the escalator. In normal state, the first contact terminal 2 and the second contact terminal 3 maintain a set distance, and the first relay control circuit and the second relay control circuit respectively drive the first relay and the second relay to close the contact of the first relay and the normally closed contact of the second relay. In an emergency, the emergency stop sensor belt is pressed, the first contact terminal 2 and the second contact terminal 3 are in contact, and the first relay control circuit and the second relay control circuit respectively drive the first relay and the second relay to open the contact of the first relay and / or the contact of the second relay, thereby stopping the escalator. In the present invention, the two relays and their control circuits are redundantly set to each other. This setting is to prevent the emergency stop device from losing control when one driver fails.

[0033] According to one embodiment of the present invention, the controller includes a sampler, and the sampler includes at least a resistor R1 and a resistor R2, wherein the resistor R1 and the resistor R2 are connected in series between the power supply VCC1 and the ground, and the intermediate node thereof provides a signal to the first relay J1 driving circuit and the second relay J2 driving circuit; the two contact terminals of the emergency stop sensor belt are connected in parallel to the two ends of the resistor R1 through the wire 4 and the wire 5, and are connected in series through the insurance resistor RS. When the button is pressed, the two contact terminals of the emergency stop sensor belt are electrically contacted.

[0034] According to one embodiment of the present invention, the relay control circuit further includes an emergency stop detector, the emergency stop detector includes a first comparator, the first comparator includes an operational amplifier IC1, a resistor R8 and a resistor R9, wherein the resistor R9 is connected between the output terminal and the in-phase terminal of the first operational amplifier IC1, the output terminal of the sampler is connected to the in-phase terminal of the first operational amplifier IC1 via the resistor R8, the first reference voltage is connected to the inverting terminal of the first operational amplifier IC1, the first reference voltage is obtained by voltage division of the resistor R6, the resistor R5 and the resistor R4, and the voltage applied to the inverting terminal of the first operational amplifier is ,

[0035] Under normal circumstances, the voltage at the in-phase terminal of the first operational amplifier IC1 is greater than the voltage at its inverting terminal, that is, At this time, the output terminal of the first operational amplifier IC1 is at a high level, and the first relay control circuit drives the relay J1 to close, so that the escalator can operate normally; when in an emergency, the user presses the button assembly, SE is turned on, and the voltage at the inverting terminal of the first operational amplifier IC1 is greater than the voltage at its inverting terminal, that is, At this time, the output terminal of the first operational amplifier IC1 is at a low level, and the first relay control circuit drives the first relay J1 to be disconnected, thereby stopping the escalator.

[0036] According to one embodiment of the present invention, the relay control circuit further includes a fault detector, wherein the second comparator of the fault detector includes a second operational amplifier IC2, a resistor R11 and a resistor R10, wherein the resistor R11 is connected between the output terminal and the non-inverting terminal of the second operational amplifier IC2, the output terminal of the sampler is connected to the inverting terminal of the second operational amplifier IC2, the second reference voltage is connected to the non-inverting terminal of the second operational amplifier IC2, and the first reference voltage is lower than the second reference voltage. In the present invention, the second reference voltage is obtained by voltage division of the resistors R6, R5 and R4, and the voltage applied to the non-inverting terminal of the second operational amplifier IC2 is Under normal circumstances, the voltage at the in-phase terminal of the second operational amplifier IC2 is greater than the voltage at its inverting terminal, that is, At this time, the output terminal of the second operational amplifier IC2 is high level, and the first relay control circuit drives the relay J1 to close, so that the escalator can operate normally; in the event of a fault, when the insurance resistor RS is disconnected or the SE and R1 emergency stop sensor belt are disconnected, the inverting terminal of the second operational amplifier IC2 is greater than its inverting terminal voltage, that is, At this time, the output end of the second operational amplifier IC2 is at a low level, and the first relay control circuit drives the first relay J1 to be disconnected, thereby stopping the escalator.

[0037] According to one embodiment of the present invention, a low-pass filter is also provided between the sampler and the emergency stop detector and the fault detector. The low-pass filter is composed of a resistor R7 and a capacitor C3 and is used to filter out high-frequency noise to prevent the high-frequency noise from interfering with the emergency stop detector and the fault detector.

[0038] According to one embodiment of the present invention, the relay control circuit further includes an "AND gate" circuit, the "AND gate" circuit includes a diode D1, a diode D2, and a pull-up resistor, wherein the cathode of the diode D2 is connected to the output end of the first comparator, and the anode is connected to the power supply VCC1 via the pull-up resistor; the cathode of the diode D1 is connected to the output end of the second comparator, and the anode is connected to the power supply VCC1 via the pull-up resistor, and the pull-up resistor is formed by a resistor R12 and a resistor R14 connected in series. The present invention sets an "AND gate" circuit after the emergency stop detector and the fault detector in order to ensure that the relay control circuit can disconnect the normally closed contact of the relay in either an emergency or a fault, thereby keeping the escalator from running.

[0039] According to one embodiment of the present invention, the relay control circuit further includes a drive circuit and a self-locking circuit. When the output of the "AND gate" circuit is a low level, the drive circuit controls the relay to disconnect its contacts; regardless of whether the output of the "AND gate" circuit is a high / or low level, the self-locking circuit controls the relay through the drive circuit to keep its contacts disconnected. The drive circuit includes a transistor Q1, the output end of the "AND gate" circuit is connected to the base of the transistor Q1 through a voltage divider circuit, the emitter of the transistor Q1 is grounded, and the collector is connected to the power supply through the coil of the first relay J1. The self-locking circuit includes a transistor Q2, a resistor R17 and a resistor R18, wherein the emitter of the transistor Q2 is grounded, the collector is connected to the base of the transistor Q1, the first end of the resistor R17 is connected to the power supply through the coil of the relay J1, and the second end is connected to the base of the transistor Q2; the first end of the resistor R18 is connected to the base of the transistor Q2, and the second end is connected to the ground. In the present invention, when the user presses a button, IC1 outputs a low level, diode D2 is turned on, the base of transistor Q1 is a low electrode, Q1 is turned off, the contact of relay J1 is disconnected, the escalator stops running, transistor Q2 is turned on, and its collector is at a low potential. At this time, if the user releases the button, operational amplifiers IC1 and IC2 output a high level, diodes D1 and diode D2 are turned off, and power supply VCC1 provides a high potential to the base of transistor Q1. However, since Q2 is turned on, Q1 is still turned off, the contact of relay J1 is disconnected, and the escalator still stops running.

[0040] According to one embodiment of the present invention, the relay control circuit further includes a third comparator, the third comparator includes an operational amplifier IC3 and a resistor R12, the positive electrodes of the diodes D1 and D2 are connected to the in-phase terminal of the operational amplifier IC3 via the resistor R12, the inverting terminal of the operational amplifier IC3 is connected to the second reference voltage, and the output terminal of the operational amplifier IC3 is connected to the input terminal of the relay driver, that is, the base of the transistor Q1 via the resistor R13. When the output of the first comparator and / or the second comparator is at a low level, the voltage at the in-phase terminal of the operational amplifier IC3 is lower than the voltage at its inverting terminal, and the output is at a low level, thus ensuring that the relay driving circuit disconnects the normally closed contact of the first relay J1; when the output of the first comparator and / or the second comparator is at a high level, the voltage at the in-phase terminal of the operational amplifier IC3 is higher than the voltage at its inverting terminal, and the output is at a high level. Due to the effect of the self-locking circuit, as long as the emergency stop device has been activated, the escalator still stops running.

[0041] In the present invention, the purpose of setting C1, C2 and C3 is to filter out clutter. The diode D3 is set between the collector of transistor Q1 and the ground to protect the relay.

[0042] In the present invention, the control circuit of the first relay J1 and the control circuit of the second relay J2 have the same structure, and both include the emergency stop detector, fault detector, third comparator, and relay drive circuit as described above, which will not be repeated here.

[0043] Figure 4 The emergency stop device shown detects the potential of the node C, and further compares it with the first reference voltage and the second reference voltage through the first comparator and the second comparator respectively to determine whether the circuit is faulty or whether the emergency stop button is pressed or a pinch occurs.

[0044] Figure 5 is a control flow chart of the escalator sensor emergency stop device provided by the present invention, such as Figure 5 As shown, according to another embodiment of the present invention, the present invention provides an escalator sensor emergency stop device which can also control the working state of the first and / or second relay by judging the impedance of the sensor, and the specific steps include:

[0045] The step of judging the impedance of the sensor, in which, if the impedance of the sensor is greater than an upper limit, it means that the circuit is faulty, and the first relay control circuit disconnects the contacts of the first relay and the second relay, so that the escalator stops running; if the impedance of the sensor is less than the upper limit, it is judged whether the impedance of the sensor is less than the lower limit. If so, it means that a user has pressed the button of the push-button sensor belt, and emergency situations such as pinching and falling of objects have occurred, so that the normally closed contacts of the first relay and the second relay are disconnected, so that the escalator stops running; if the impedance of the sensor is less than the upper limit and greater than the lower limit, it means that the circuit is not faulty and no emergency situation has occurred, so the normally closed contacts of the first relay and the second relay are closed, and the escalator works normally. Figure 4 In the embodiment, the sensor is composed of SE and resistor R1 connected in parallel and then connected in series with RS. According to another embodiment of the present invention, the sensor can also be composed of an emergency stop sensor with a resistor RX connected in series and then connected in parallel with the resistor R1, and then connected in series with a fuse resistor, which opens when the current is large.

[0046] The working principle of the present invention is described in detail above in conjunction with the accompanying drawings. However, those skilled in the art should understand that the description is only used to interpret the claims. However, the protection scope of the present invention is not limited to the description. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An escalator sensor emergency stop device, comprising a controller, characterized in that , also includes an emergency stop sensor belt arranged on the escalator, the controller includes a first relay, a second relay, a first relay control circuit and a second relay control circuit, the first relay contact and the second relay contact are connected in series to the power supply circuit of the driving mechanism of the escalator; the emergency stop sensor belt includes a first contact terminal and a second contact terminal that maintain a set distance under normal conditions, under normal conditions, the first relay control circuit and the second relay control circuit drive the first relay and the second relay to close the contacts of the first relay and the second relay, in an emergency, an external force causes the first contact terminal and the second contact terminal to contact, the first relay control circuit and the second relay control circuit drive the first relay and the second relay to open the contacts of the first relay and / or the normal contacts of the second relay, thereby stopping the escalator; the escalator sensor emergency stop device also includes a sensor, which controls the working state of the first relay and / or the second relay by judging the impedance of the sensor.

2. The escalator sensor emergency stop device according to claim 1, characterized in that: The relay control circuit includes a sampler, which includes at least a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series and connected between a power supply and a ground, and an intermediate node thereof provides a signal to a first relay drive circuit and a second relay drive circuit; and both ends of the first resistor are respectively connected to a first contact terminal and a second contact terminal.

3. The escalator sensor emergency stop device according to claim 2, characterized in that: The relay control circuit includes an emergency stop detector, which includes a first comparator, which includes a first operational amplifier (IC1), a third resistor (R9) and a fourth resistor (R8), wherein the third resistor (R9) is connected between an output terminal and a non-inverting terminal of the first operational amplifier, the output terminal of the sampler is connected to the non-inverting terminal of the first operational amplifier via the fourth resistor (R8), and the first reference voltage is connected to the inverting terminal of the first operational amplifier.

4. The escalator sensor emergency stop device according to claim 3, characterized in that: The relay control circuit includes a fault detector, which includes a second operational amplifier (IC2), a fifth resistor (R11) and a sixth resistor (R10), wherein the fifth resistor (R11) is connected between an output terminal and a non-inverting terminal of the second operational amplifier, the output terminal of the sampler is connected to an inverting terminal of the second operational amplifier, a second reference voltage is connected to the non-inverting terminal of the second operational amplifier via the sixth resistor (R10), and the first reference voltage is lower than the second reference voltage.

5. The escalator sensor emergency stop device according to claim 4, characterized in that: The relay control circuit also includes an AND gate circuit, which includes a first diode (D1), a second diode (D2), a seventh resistor (R12) and an eighth resistor (R14), wherein the cathode of the first diode (D1) is connected to the output end of the first comparator, and the anode is connected to the power supply via the seventh resistor (R12) and the eighth resistor (R14); the cathode of the second diode (D2) is connected to the output end of the second comparator, and the anode is connected to the power supply via the seventh resistor (R12) and the eighth resistor (R14).

6. The escalator sensor emergency stop device according to claim 5, characterized in that: The relay control circuit also includes a drive circuit and a self-locking circuit. When the output of the "AND gate" circuit is a low level, the drive circuit controls the relay to disconnect its contacts; regardless of whether the output of the "AND gate" circuit is a high or low level, the self-locking circuit controls the relay through the drive circuit to keep its contacts disconnected.

7. The escalator sensor emergency stop device according to claim 6, characterized in that: The driving circuit comprises a first transistor (Q1), the output end of the AND gate circuit is connected to the base of the first transistor, the emitter of the first transistor is grounded via an eighth resistor, and the collector is connected to the power supply via a coil of the first relay.

8. The escalator sensor emergency stop device according to claim 7, characterized in that: The self-locking circuit comprises a second transistor (Q2), a ninth resistor (R17) and a tenth resistor (R18), wherein the emitter of the second transistor is grounded, the collector is connected to the base of the first transistor, the first end of the ninth resistor is connected to the power supply via the coil of the first relay, and the second end is connected to the base of the second transistor; the first end of the tenth resistor is connected to the base of the second transistor, and the second end is connected to the ground.

9. The escalator sensor emergency stop device according to any one of claims 1 to 8, characterized in that: The emergency stop sensor belt is installed on the lower side plate of the escalator handrail, the apron plate, the handrail inlet and / or the upper and lower handrails of the escalator to prevent children from falling.

10. The escalator sensor emergency stop device according to claim 9, characterized in that: The first contact terminal and the second contact terminal are made of a flexible conductive material made of a carbon material.

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