An explosion-proof elevator safety circuit monitoring system

Abstract

The utility model discloses a safety circuit monitoring system for explosion-proof elevators, the system includes multiple safety barriers and a safety circuit with multiple safety switches connected in series, wherein the safety switches are respectively arranged at different switch monitoring points of the explosion-proof elevator, the safety switches are in a normally closed state, and when a switch monitoring point fails, the safety switches enter an open state, the safety barrier includes at least one channel, and each channel corresponds to a detection status indicator light, and the number of channels of the safety barrier matches the number of safety switches; the two ends of each safety switch are connected to two signal input pins of a channel; the safety barrier is used to light up the detection status indicator light of the corresponding channel when the connected safety switch is in a closed state, and to extinguish the detection status indicator light of the corresponding channel when the connected safety switch is in an open state, so as to indicate that there is a fault at the switch monitoring point corresponding to the safety switch. The above system can realize fault location of explosion-proof elevators.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator control, in particular to an explosion-proof elevator safety circuit monitoring system. Background Art

[0002] The elevator safety circuit means that each safety component of the elevator is equipped with a safety switch. All safety switches are connected in series to control a safety relay. Only when all safety switches are in the on state will the safety relay be energized and the elevator can be powered on. Each safety switch on the safety circuit plays a safety monitoring role to ensure the safety of passengers or equipment in transportation. In particular, explosion-proof elevators in the application scenario of space launch sites are responsible for the key guarantee task of transporting to the tower in the site.

[0003] When there is a safety circuit fault in the existing explosion-proof elevators at the space launch site, the corresponding personnel are required to determine whether there is a fault in the elevator safety circuit by observing the status of the elevator control cabinet safety circuit contactor, the inverter display, the car instructions, etc. However, since the safety switches in the safety circuit are all connected in series and the components are distributed over a wide range, a large number of personnel are required to measure and troubleshoot the safety switches in the safety circuit one by one through measuring instruments such as clamp ammeters and multimeters, resulting in low troubleshooting efficiency. Utility Model Content

[0004] In view of this, the utility model provides an explosion-proof elevator safety circuit monitoring system, the main purpose of which is to solve the technical problem of low efficiency in troubleshooting safety faults of existing explosion-proof elevators.

[0005] To achieve the above-mentioned purpose, the utility model first provides an explosion-proof elevator safety circuit monitoring system, the circuit includes a plurality of safety barriers and a safety circuit with a plurality of safety switches connected in series, wherein the safety switches are respectively arranged at different switch monitoring points of the explosion-proof elevator, the safety switches are in a normally closed state, and in the event of a failure at the switch monitoring point, the safety switches enter an open state, the safety barrier includes at least one channel, and each of the channels corresponds to a detection status indicator light, and the number of channels of the safety barrier matches the number of the safety switches;

[0006] Two ends of each of the safety switches are connected to two signal input pins of one of the channels;

[0007] The safety barrier is used to light up the detection status indicator light of the corresponding channel when the connected safety switch is in the closed state, and to extinguish the detection status indicator light of the corresponding channel when the connected safety switch is in the open state, so as to indicate that there is a fault at the switch monitoring point corresponding to the safety switch.

[0008] Optionally, the system further comprises a controller, and the safety barrier is a single channel;

[0009] The signal output pins of the safety barriers are connected in series, the first non-common end of the signal output pins of all the safety barriers connected in series is connected to the first signal input pin of the controller, and the second non-common end is connected to the second signal input pin of the controller;

[0010] The safety barrier is also used to disconnect the internal normally closed switch between the corresponding signal output pins when the connected safety switch is in the open state, so as to interrupt the signal input to the controller;

[0011] The controller is used to control the explosion-proof elevator to stop running when the signals input by the first signal input pin and the second signal input pin are interrupted.

[0012] Optionally, the system further comprises a controller, and the safety barrier comprises two or more channels;

[0013] Wherein, each of the safety gates is connected in series between the signal output pins of the channel in use, the first non-common end of all the signal output pins of the channel in use connected in series is connected to the first signal input pin of the controller, the second non-common end is connected to the second signal input pin of the controller, and the channel in use is a safety gate channel where the signal input pin is connected to the safety switch;

[0014] The safety barrier is also used to disconnect the internal normally closed switch between the signal output pins of the corresponding channel when the connected safety switch is in the open state, so as to interrupt the signal input to the controller;

[0015] The controller is used to control the explosion-proof elevator to stop running when the signals input by the first signal input pin and the second signal input pin are interrupted.

[0016] Optionally, the controller is a programmable controller or a distributed control system.

[0017] Optionally, the safety barrier further includes a power indicator light, which indicates that a switch monitoring point corresponding to the safety switch has a fault, including:

[0018] When the power indicator light of the safety barrier is on and the detection status indicator light of the channel is off, it indicates that a fault exists at a switch monitoring point where the safety switch connected to the channel is located.

[0019] Optionally, the safety switch includes a control cabinet emergency stop switch, a first pit emergency stop switch, a second pit emergency stop switch, a car top emergency stop switch, a machine room emergency stop switch, an upper limit switch, a lower limit switch, a turning handwheel switch, a tensioning wheel switch, a speed limiter switch, a rope clamp switch and a safety clamp switch.

[0020] Optionally, when the car buffer of the explosion-proof elevator is a hydraulic buffer, the safety switch further includes a car buffer switch; and / or,

[0021] When the counterweight buffer of the explosion-proof elevator is a hydraulic buffer, the safety switch also includes a counterweight buffer switch.

[0022] Optionally, the system further comprises: an image acquisition device;

[0023] The image acquisition device is used to acquire in real time the video images of the structural surfaces where the detection status indicator lights of all the safety barriers are located, and store the video images.

[0024] Optionally, the system further comprises: a mobile terminal;

[0025] The image acquisition device is communicatively connected with the mobile terminal, and is used for responding to a video image retrieval instruction and sending a video image of a time interval matching the video image retrieval instruction to the mobile terminal.

[0026] The utility model provides an explosion-proof elevator safety circuit monitoring system, which can connect each safety switch in the safety circuit with a channel of the safety barrier, wherein the safety barrier includes at least one channel, and each of the channels corresponds to a detection status indicator light, and the number of channels of the safety barrier matches the number of the safety switches. The safety switch is in a normally closed state; in the event of a fault at the switch monitoring point, the safety switch enters an open state, and the detection status indicator light of the corresponding channel switches from a lit state to an off state. Through the above circuit, the opening and closing state of the safety switch can be represented by the state of the detection status indicator light of the corresponding safety barrier channel, avoiding the need to check the safety switches one by one, while ensuring the accuracy of the confirmation of the opening and closing state of the safety switch, thereby improving the efficiency of troubleshooting of safety circuit faults.

[0027] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0029] Figure 1 The following is a structural block diagram of a safety circuit monitoring system for explosion-proof elevators provided by an embodiment of the utility model;

[0030] Figure 2 A schematic diagram of pin connections between a safety barrier and a safety switch provided in an embodiment of the utility model is shown.

[0031] Figure 3 A schematic diagram of a circuit structure in which multiple safety barriers and multiple safety switches are connected is shown in an embodiment of the utility model. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0033] In order to further explain the technical means and effects adopted by the utility model to achieve the predetermined utility model purpose, the specific implementation methods, structures, features and effects of the utility model application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0034] Combine the following Figure 1 and Figure 2 The invention describes an explosion-proof elevator safety circuit monitoring system according to some embodiments of the present invention.

[0035] In one embodiment, Figure 1As shown, a safety circuit monitoring system for an explosion-proof elevator is provided. The circuit includes a plurality of safety barriers 10 and a safety circuit 30 with a plurality of safety switches 20 connected in series, wherein the safety switches 20 are respectively arranged at different switch monitoring points of the explosion-proof elevator, the safety switches 20 are in a normally closed state, and when a switch monitoring point fails, the safety switches 20 enter an open state, the safety barrier 10 includes at least one channel, and each channel corresponds to a detection status indicator light, and the number of channels of the safety barrier 10 matches the number of safety switches; both ends of each safety switch 20 are connected to two signal input pins of a channel; the safety barrier 10 is used to light up the detection status indicator light of the corresponding channel when the connected safety switch is in the closed state, and to extinguish the detection status indicator light of the corresponding channel when the connected safety switch 20 is in the open state, so as to indicate that there is a fault at the switch monitoring point corresponding to the safety switch 20.

[0036] In the above embodiment, the safety circuit is an object to be monitored, including multiple safety switches connected in series. The safety barrier is a monitoring execution device, including at least one channel, and each channel corresponds to a detection status indicator light, and the number of channels of the safety barrier matches the number of safety switches. For example, if all safety barriers are single-channel, the number of safety barriers is equal to the number of safety switches; if all safety barriers are dual-channel, the number of safety barriers is half the number of safety switches; if the safety barrier is a mixture of single-channel and dual-channel, the total number of channels of all safety barriers is greater than or equal to the number of safety switches. The two ends of each safety switch are connected to the two signal input pins of a channel of the safety barrier, and the power input pin of the safety barrier is connected to a power supply with matching power supply specifications. Taking an explosion-proof safety barrier as an example, the connection relationship between the safety barrier and the safety switch is as follows: Figure 2As shown, the signal input pins 9 and 10 of the safety barrier in the figure are respectively connected to the two ends of the safety switch of the same polarity, the power input pins 3 and 4 are connected to the 24V DC power supply, and the output pins 1 and 2 are used to connect the 1 and 2 pins of other safety barriers or the input pins of the controller in series in the embodiment connected with the controller. Among them, the safety switches are respectively arranged at different switch monitoring points of the explosion-proof elevator. The safety switch is in a normally closed closing state. In the case of a fault at the switch monitoring point, the safety switch enters the open state. When the connected safety switch is in the closed state, the safety barrier lights up the detection status indicator light of the corresponding channel, and when the connected safety switch is in the open state, the detection status indicator light of the corresponding channel is extinguished to indicate that there is a fault at the switch monitoring point corresponding to the safety switch. The specific fault location method can mark the corresponding safety switch name and position near the detection status indicator light of each channel, or predetermine a comparison table of channels and safety switches, so that when the detection status indicator light of a certain channel is extinguished, the corresponding safety switch is determined by the comparison table or mark, and then the corresponding fault position is determined, which is not specifically limited in the embodiment of the utility model. In addition, the safety barrier is a safety barrier that meets explosion-proof requirements and can also effectively ensure the safety and reliability requirements of explosion-proof elevators.

[0037] Working principle: The safety switch corresponds to each safety component in the explosion-proof elevator, and its opening and closing state is used to reflect the operating state of the corresponding safety component. The safety switch is a normally closed switch. When the safety component operates normally, it is in the closed state. When the safety component fails to operate, the state of the safety switch is switched from the closed state to the open (open) state. The two ends of the safety switch are connected to the two signal input pins of a channel of the safety barrier. When the safety switch is in the closed state, the detection status indicator of the corresponding safety barrier channel is lit. When the safety switch is in the open state, the detection status indicator of the corresponding safety barrier channel is off. When it is necessary to determine the fault location, it is only necessary to observe the on and off state of the safety barrier detection status indication. According to the safety switch corresponding to the channel with the lights off, the fault location can be determined. For example, the channel with the lights off corresponds to the car buffer switch, so the fault location can be determined to be near the car buffer. The channel with the lights off corresponds to the pit bottom emergency stop switch, so the fault location can be determined to be the pit bottom of the explosion-proof elevator. The above circuit can avoid checking each switch monitoring point of the explosion-proof elevator one by one, which saves manpower and time consumption for checking to a certain extent, ensures the efficiency of troubleshooting, and is conducive to the rapid positioning and maintenance of faults.

[0038] It should be noted that the circuit functions of the explosion-proof elevator safety circuit monitoring system provided in this embodiment are mainly realized through the circuit connection relationship between various circuit modules, and do not rely on the program module in a certain circuit module. In addition, each circuit module in the explosion-proof elevator safety circuit monitoring system can be realized by analog circuits or digital circuits, and for circuit modules that can be implanted with program modules, the realization of their module functions can be realized by program modules provided by the prior art.

[0039] The explosion-proof elevator safety circuit monitoring system proposed in the embodiment of the utility model can be connected by connecting each safety switch in the safety circuit to a channel of the safety barrier, wherein the safety barrier includes at least one channel, and each channel corresponds to a detection status indicator light, and the number of channels of the safety barrier matches the number of safety switches. The safety switch is in a normally closed state; in the event of a fault at the switch monitoring point, the safety switch enters an open state, and the detection status indicator light of the corresponding channel switches from a lit state to an off state. Through the above circuit, the opening and closing state of the safety switch can be represented by the state of the detection status indicator light of the corresponding safety barrier channel, avoiding the need to check the safety switches one by one, while ensuring the accuracy of the confirmation of the opening and closing state of the safety switch, thereby improving the efficiency of troubleshooting of safety circuit faults.

[0040] In one embodiment, the above-mentioned explosion-proof elevator safety circuit monitoring system also includes a controller, and the safety barrier is a single channel; wherein the signal output pins of each safety barrier are connected in series, the first non-common end of the signal output pins of all the safety barriers connected in series is connected to the first signal input pin of the controller, and the second non-common end is connected to the second signal input pin of the controller; the safety barrier is also used to disconnect the internal normally closed switch between the corresponding signal output pins when the connected safety switch is in the open state, so as to interrupt the signal input to the controller; the controller is used to control the explosion-proof elevator to stop running when the signals input from the first signal input pin and the second signal input pin are interrupted.

[0041] Specifically, inside the safety barrier, there is a normally closed switch between the signal output pins. When the signal input pin is connected to the safety switch in the closed state, the normally closed switch remains in the closed state. When the signal input pin is connected to the safety switch in the open state, the normally closed switch is triggered to switch to the open state. Figure 3As shown, the signal input pin of the safety barrier is connected to the corresponding safety switch, wherein 1U1 and 1U2 are two terminals of safety switch 1, 2U1 and 2U2 are two terminals of safety switch 2, and so on. The signal output pins of each safety barrier are connected in series in sequence. In the n safety barrier series circuit, a signal output pin 911 of the first safety barrier AP01 and a signal output pin 910 of the last safety barrier APn are connected to the signal input pin of the controller. The specific number of safety barriers and safety switches in the figure can be determined according to the actual application scenario and are not described one by one. Since the signal output pins of the safety barrier are connected in series, when all safety switches are in the closed state, the signal input pin of the controller continues to receive signals; when any safety switch is in the open state, the circuit connected in series is in the open circuit state, and the signal input pin of the controller also cannot receive signals. When the controller cannot receive signals, the explosion-proof elevator is immediately controlled to stop running. By introducing the controller, on the basis of monitoring the state of the safety switch and locating the fault position, the overall operation of the elevator is controlled in the fault state to avoid the elevator from running in the fault state, avoid the generation of derivative dangers, and ensure the safety of equipment and personnel in the elevator.

[0042] In one embodiment, the above-mentioned explosion-proof elevator safety circuit monitoring system also includes a controller, and the safety barrier includes two or more channels; wherein, each safety barrier is connected in series between the signal output pins of the use channel, the first non-common end of all the signal output pins of the use channel connected in series is connected to the first signal input pin of the controller, the second non-common end is connected to the second signal input pin of the controller, and the use channel is a safety barrier channel connected to the signal input pin of the safety switch; the safety barrier is also used to disconnect the internal normally closed switch between the signal output pins of the corresponding channel when the connected safety switch is in the open state, so as to interrupt the signal input to the controller; the controller is used to control the explosion-proof elevator to stop running when the signals input from the first signal input pin and the second signal input pin are interrupted.

[0043] Specifically, when the safety barrier used to connect the safety switch includes a dual-channel or multi-channel safety barrier, it is necessary not only to connect the safety barriers in series, but also to connect the two channels of the same safety barrier in series, so as to connect the signal output pins of the channels corresponding to all safety switches in series. The difference here from the single-channel safety barrier is that the minimum unit of the series connection is the channel of the safety barrier, not the individual safety barrier. The other circuit principles are the same and will not be repeated here. By using a dual-channel or multi-channel safety barrier, the use of the safety barrier can be reduced, thereby achieving the purpose of reducing the equipment cost of safety circuit monitoring.

[0044] In one embodiment, the controller in the above explosion-proof elevator safety circuit monitoring system is a programmable controller or a distributed control system.

[0045] Specifically, the controller may be a programmable logic controller (PLC) or a distributed control system (DSP). The controller may be selected based on the actual application scenario, and the embodiments of the present invention do not make any specific limitations.

[0046] In one embodiment, the safety barrier in the above-mentioned explosion-proof elevator safety circuit monitoring system also includes a power indicator light to indicate that there is a fault at the switch monitoring point corresponding to the safety switch, including: when the power indicator light of the safety barrier is on and the detection status indicator light of the channel is off, it indicates that there is a fault at the switch monitoring point where the safety switch connected to the channel is located.

[0047] Specifically, in addition to the detection status indicator light, the safety barrier also includes a power indicator light to indicate whether the current safety barrier is powered normally. When the detection status indicator light of the channel is off, there are two possibilities: one is that the safety switch connected to the current channel is in the open state, and the other is that the power supply of the safety barrier where the current channel is located is abnormal, resulting in the entire safety barrier being out of power. Therefore, it is necessary to further combine the power indicator light to eliminate the abnormal power supply of the safety barrier where the current channel is located, thereby improving the accuracy of fault location.

[0048] In one embodiment, the safety switches in the above-mentioned explosion-proof elevator safety circuit monitoring system include a control cabinet emergency stop switch, a first pit emergency stop switch, a second pit emergency stop switch, a car top emergency stop switch, a machine room emergency stop switch, an upper limit switch, a lower limit switch, a turning handwheel switch, a tensioner switch, a speed limiter switch, a rope clamp switch and a safety clamp switch.

[0049] Specifically, in actual application scenarios, the machine room emergency stop switch may also include a first machine room emergency stop switch and a second machine room emergency stop switch, which are switched from the closed state to the open state when the elevator machine room operates abnormally. The control cabinet emergency stop switch is a safety switch of the explosion-proof elevator control cabinet, which is switched from the closed state to the open state when the control cabinet circuit is abnormal. The first pit emergency stop switch is the first emergency stop switch at the bottom of the elevator shaft pit, and the second pit emergency stop switch is the second emergency stop switch at the bottom of the elevator shaft pit. The two emergency stop switches have a double insurance effect, thereby reducing the risk of the elevator rope causing harm to maintenance personnel. The car top emergency stop switch is a limit switch on the top of the elevator car. When the car roof exceeds the restricted height, it switches from the closed state to the open state. The upper and lower limit switches are safety switches that limit the upper and lower limit positions of the elevator. Once the elevator exceeds the corresponding position, the corresponding switch switches from the closed state to the open state. The handwheel switch is usually located inside the control box around the handwheel. It is used in emergency situations such as overload, blackout and other abnormal situations. This safety switch will immediately take effect and force the elevator to stop running to avoid dangerous accidents. The tensioner switch is a safety switch that reflects whether the tensioner is running normally. If the tensioner fails, the safety switch will switch from the closed state to the open state. The speed limiter switch is a safety switch that reflects whether the speed limiter is running normally. If the speed limiter fails, the safety switch will switch from the closed state to the open state. The rope clamp switch can stop the elevator in an emergency to protect the lives of passengers when the elevator speed is abnormal or the rope is broken. The safety clamp switch can quickly disconnect the corresponding power supply when the mechanical parts of the elevator move abnormally. By introducing the above safety switches, comprehensive monitoring of explosion-proof elevators can be achieved to ensure that the safety barrier fully monitors the opening and closing status of the safety switch.

[0050] In one embodiment, the safety switch in the above-mentioned explosion-proof elevator safety circuit monitoring system includes that when the car buffer of the explosion-proof elevator is a hydraulic buffer, the safety switch also includes a car buffer switch; and / or, when the counterweight buffer of the explosion-proof elevator is a hydraulic buffer, the safety switch also includes a counterweight buffer switch.

[0051] Specifically, the safety switch may include a car buffer switch and a counterweight buffer switch, or may not include them, which needs to be determined according to the type of buffer used in the explosion-proof elevator. If the car buffer is a hydraulic type, the safety switch includes a car buffer switch. Similarly, if the counterweight buffer is a hydraulic type, the safety switch includes a counterweight buffer switch. If the car buffer is a polyurethane type, the safety switch does not need to include a car buffer switch; similarly, if the counterweight buffer is a polyurethane type, the safety switch does not need to include a counterweight buffer switch. By introducing the above-mentioned safety switch, the monitoring of the safety barrier can be applied to explosion-proof elevators with different types of buffer configurations, thereby further improving the comprehensiveness of the safety barrier's monitoring of the opening and closing status of the safety switch.

[0052] In one embodiment, the above-mentioned explosion-proof elevator safety circuit monitoring system also includes: an image acquisition device; wherein the image acquisition device is used to acquire video images of the structural surface where the detection status indicator lights of all safety barriers are located in real time, and store the video images.

[0053] Specifically, in actual application scenarios, the safety switch may be temporarily opened, that is, the safety switch is opened and then closed again in a short time. Due to the short time, this situation may not cause the elevator to stop running, but it is also a situation that needs attention in elevator troubleshooting and monitoring. However, in reality, it is impossible to ensure that the detection status indicator light of the safety barrier is under the supervision of personnel throughout the process. The image acquisition device includes a storage unit. By introducing the image acquisition device into the system, the on and off status of the detection status indicator lights of all safety barriers are recorded in real time, and the corresponding video images are stored to provide data support for subsequent troubleshooting. Among them, the image acquisition device can be an industrial camera, a surveillance camera or a video camera, etc., which is not specifically limited in the embodiments of the utility model.

[0054] In one embodiment, the above-mentioned explosion-proof elevator safety circuit monitoring system also includes: a mobile terminal; an image acquisition device is communicatively connected to the mobile terminal, and is used to respond to a video image retrieval instruction and send a video image of a time interval matching the video image retrieval instruction to the mobile terminal.

[0055] Specifically, the image acquisition device includes a processor, which can be used to receive a retrieval instruction from a mobile terminal, retrieve video images according to the instruction, and send the video images to the mobile terminal. The mobile terminal can be a patrol communication terminal of an elevator patrol inspector, or a personal mobile device, such as a smart phone. The video image retrieval instruction can be issued by a mobile terminal or a computer device in a monitoring center. The video image retrieval instruction carries a time interval, that is, the time interval in which the video image needs to be retrieved. After receiving the video image retrieval instruction, the video image matching the time interval is retrieved from the video image storage space and sent to the mobile terminal. By introducing a mobile terminal, the status of the safety barrier detection status indicator light can be remotely confirmed, and the remote identification of the fault location of the safety component can be realized, thereby improving the flexibility and efficiency of fault location confirmation. Specific embodiment:

[0057] In one embodiment, Figure 1As shown, a safety circuit monitoring system for an explosion-proof elevator is provided. The circuit includes a plurality of safety barriers 10 and a safety circuit 30 with a plurality of safety switches 20 connected in series, wherein the safety switches 20 are respectively arranged at different switch monitoring points of the explosion-proof elevator, the safety switches 20 are in a normally closed state, and when a switch monitoring point fails, the safety switches 20 enter an open state, the safety barrier 10 includes at least one channel, and each channel corresponds to a detection status indicator light, and the number of channels of the safety barrier 10 matches the number of safety switches; both ends of each safety switch 20 are connected to two signal input pins of a channel; the safety barrier 10 is used to light up the detection status indicator light of the corresponding channel when the connected safety switch is in the closed state, and to extinguish the detection status indicator light of the corresponding channel when the connected safety switch 20 is in the open state, so as to indicate that there is a fault at the switch monitoring point corresponding to the safety switch 20.

[0058] In this embodiment, the explosion-proof elevator safety circuit monitoring system also includes a controller, and the safety barrier is a single channel; wherein the signal output pins of each safety barrier are connected in series, the first non-common end of the signal output pins of all the safety barriers connected in series is connected to the first signal input pin of the controller, and the second non-common end is connected to the second signal input pin of the controller; the safety barrier is also used to disconnect the internal normally closed switch between the corresponding signal output pins when the connected safety switch is in the open state, so as to interrupt the signal input to the controller; the controller is used to control the explosion-proof elevator to stop running when the signal input to the first signal input pin and the second signal input pin is interrupted. Wherein, the controller is a programmable controller or a distributed control system. The safety barrier also includes a power indicator light to indicate that there is a fault at the switch monitoring point corresponding to the safety switch, including: when the power indicator light of the safety barrier is on and the detection status indicator light of the channel is off, it indicates that there is a fault at the switch monitoring point where the safety switch connected to the channel is located.

[0059] In this embodiment, the explosion-proof elevator safety circuit monitoring system also includes a controller, and the safety barrier includes two or more channels; wherein each safety barrier is connected in series between the signal output pins of the use channel, and the first non-common end of all the signal output pins of the use channel is connected in series with the first signal input pin of the controller, and the second non-common end is connected with the second signal input pin of the controller, and the use channel is a safety barrier channel connected with the signal input pin and the safety switch; the safety barrier is also used to disconnect the internal normally closed switch between the signal output pins of the corresponding channel when the connected safety switch is in the open state, so that the signal input to the controller is interrupted; the controller is used to control the explosion-proof elevator to stop running when the signal input from the first signal input pin and the second signal input pin is interrupted. Wherein, the controller is a programmable controller or a distributed control system. The safety barrier also includes a power indicator light to indicate that there is a fault at the switch monitoring point corresponding to the safety switch, including: when the power indicator light of the safety barrier is on and the detection status indicator light of the channel is off, it indicates that there is a fault at the switch monitoring point where the safety switch connected to the channel is located.

[0060] In this embodiment, the safety switch includes a control cabinet emergency stop switch, a first pit emergency stop switch, a second pit emergency stop switch, a car top emergency stop switch, a machine room emergency stop switch, an upper limit switch, a lower limit switch, a turning hand wheel switch, a tensioner switch, a speed limiter switch, a rope clamp switch and a safety clamp switch. Wherein, when the car buffer of the explosion-proof elevator is a hydraulic buffer, the safety switch also includes a car buffer switch; and / or, when the counterweight buffer of the explosion-proof elevator is a hydraulic buffer, the safety switch also includes a counterweight buffer switch. The image acquisition device is communicatively connected to the mobile terminal, and is used to respond to the video image retrieval instruction and send a video image of a time interval matching the video image retrieval instruction to the mobile terminal.

[0061] In this embodiment, the explosion-proof elevator safety circuit monitoring system also includes: an image acquisition device and a mobile terminal; the image acquisition device is used to acquire video images of the structural surface where the detection status indicator lights of all the safety barriers are located in real time, and store the video images.

[0062] The explosion-proof elevator safety circuit monitoring system proposed in the embodiment of the utility model can be connected by connecting each safety switch in the safety circuit to a channel of the safety barrier, wherein the safety barrier includes at least one channel, and each channel corresponds to a detection status indicator light, and the number of channels of the safety barrier matches the number of safety switches. The safety switch is in a normally closed state; in the event of a fault at the switch monitoring point, the safety switch enters an open state, and the detection status indicator light of the corresponding channel switches from a lit state to an off state. Through the above circuit, the opening and closing state of the safety switch can be represented by the state of the detection status indicator light of the corresponding safety barrier channel, avoiding the need to check the safety switches one by one, while ensuring the accuracy of the confirmation of the opening and closing state of the safety switch, thereby improving the efficiency of troubleshooting of safety circuit faults.

[0063] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An explosion-proof elevator safety circuit monitoring system, characterized in that: The system includes a plurality of safety barriers and a safety circuit having a plurality of safety switches connected in series, wherein the safety switches are respectively arranged at different switch monitoring points of the explosion-proof elevator, the safety switches are in a normally closed state, and in the event of a failure at the switch monitoring point, the safety switches enter an open state, the safety barrier includes at least one channel, and each of the channels corresponds to a detection status indicator light, and the number of channels of the safety barrier matches the number of the safety switches; Two ends of each of the safety switches are connected to two signal input pins of one of the channels; The safety barrier is used to light up the detection status indicator light of the corresponding channel when the connected safety switch is in the closed state, and to extinguish the detection status indicator light of the corresponding channel when the connected safety switch is in the open state, so as to indicate that there is a fault at the switch monitoring point corresponding to the safety switch.

2. The explosion-proof elevator safety circuit monitoring system according to claim 1 is characterized in that: The system further comprises a controller, wherein the safety barrier is a single channel; The signal output pins of the safety barriers are connected in series, the first non-common end of the signal output pins of all the safety barriers connected in series is connected to the first signal input pin of the controller, and the second non-common end is connected to the second signal input pin of the controller; The safety barrier is also used to disconnect the internal normally closed switch between the corresponding signal output pins when the connected safety switch is in the open state, so as to interrupt the signal input to the controller; The controller is used to control the explosion-proof elevator to stop running when the signals input by the first signal input pin and the second signal input pin are interrupted.

3. The explosion-proof elevator safety circuit monitoring system according to claim 1 is characterized in that: The system further comprises a controller, wherein the safety barrier comprises two or more channels; Wherein, each of the safety gates is connected in series between the signal output pins of the channel in use, the first non-common end of all the signal output pins of the channel in use connected in series is connected to the first signal input pin of the controller, the second non-common end is connected to the second signal input pin of the controller, and the channel in use is a safety gate channel where the signal input pin is connected to the safety switch; The safety barrier is further used to disconnect the internal normally closed switch between the signal output pins of the corresponding channel when the connected safety switch is in the open state, so as to interrupt the signal input to the controller; The controller is used to control the explosion-proof elevator to stop running when the signals input by the first signal input pin and the second signal input pin are interrupted.

4. The explosion-proof elevator safety circuit monitoring system according to claim 2 or 3, characterized in that: The controller is a programmable controller or a distributed control system.

5. The explosion-proof elevator safety circuit monitoring system according to claim 4 is characterized in that: The safety barrier also includes a power indicator light, which indicates that a switch monitoring point corresponding to the safety switch has a fault, including: When the power indicator light of the safety barrier is on and the detection status indicator light of the channel is off, it indicates that a fault exists at a switch monitoring point where the safety switch connected to the channel is located.

6. The explosion-proof elevator safety circuit monitoring system according to claim 1, characterized in that: The safety switches include a control cabinet emergency stop switch, a first pit emergency stop switch, a second pit emergency stop switch, a car top emergency stop switch, a machine room emergency stop switch, an upper limit switch, a lower limit switch, a turning handwheel switch, a tensioner wheel switch, a speed limiter switch, a rope clamp switch and a safety clamp switch.

7. The explosion-proof elevator safety circuit monitoring system according to claim 6, characterized in that: When the car buffer of the explosion-proof elevator is a hydraulic buffer, the safety switch further includes a car buffer switch; and / or, When the counterweight buffer of the explosion-proof elevator is a hydraulic buffer, the safety switch also includes a counterweight buffer switch.

8. The explosion-proof elevator safety circuit monitoring system according to claim 1, characterized in that: The system also includes: an image acquisition device; The image acquisition device is used to acquire in real time the video images of the structural surfaces where the detection status indicator lights of all the safety barriers are located, and store the video images.

9. The explosion-proof elevator safety circuit monitoring system according to claim 8, characterized in that: The system further comprises: a mobile terminal; The image acquisition device is communicatively connected with the mobile terminal, and is used for responding to a video image retrieval instruction and sending a video image of a time interval matching the video image retrieval instruction to the mobile terminal.

Images