CN213568965U - Electronic safety plate and elevator electronic safety system - Google Patents
Electronic safety plate and elevator electronic safety system Download PDFInfo
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- CN213568965U CN213568965U CN202021688291.5U CN202021688291U CN213568965U CN 213568965 U CN213568965 U CN 213568965U CN 202021688291 U CN202021688291 U CN 202021688291U CN 213568965 U CN213568965 U CN 213568965U
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Abstract
The utility model provides an electronic safety plate and an elevator electronic safety system, wherein the electronic safety plate comprises a first communication unit, a logic control unit, a first conditioning circuit, a second conditioning circuit and at least one operation control button; the logic control unit is connected with the operation control button through the first conditioning circuit, is connected with an external operation control device through a second conditioning circuit and a first connecting cable, and sends the states of the operation control button and the operation control device through the first communication unit and a communication bus. The embodiment of the utility model provides a can simplify urgent electronic operation/maintenance controlling means's interconnecting link, reduce the contact quantity among the urgent electronic operation/maintenance controlling means, the cost is reduced.
Description
Technical Field
The embodiment of the utility model provides a relate to the elevator field, more specifically say, relate to an electron safety plate and elevator electron safety coefficient.
Background
With the development of cities, high-rise buildings rise frequently, and the use of elevators is more and more popular. The elevator is a device which vertically moves among different floors in a shaft, a car door is arranged on an elevator car, a shaft door is correspondingly arranged on the wall of the shaft and leads to each floor, and passengers can get in and out of the car by opening the car door and the shaft door.
As shown in fig. 1, in order to ensure the safety of the elevator, the elevator is required to have an emergency electric operation control device 12, a car top maintenance control device 13, a pit maintenance control device 14, and the like, which are specified in the elevator-related standards, wherein the emergency electric operation control device 12, the car top maintenance control device 13, and the pit maintenance control device 14 respectively include a plurality of operation buttons, and send signals (for example, the buttons are triggered) to the control cabinet 11, and the control cabinet 11 controls the elevator to enter various operation states according to the signals. After the elevator has entered the run state, the elevator safety circuit will be disconnected and remain until the corresponding run button is activated.
At present, the emergency electric operation control device 12, the car top maintenance control device 13, and the pit maintenance control device 14 are mainly connected to the control cabinet 11 through a wire harness, and since the emergency electric operation control device 12, the car top maintenance control device 13, and the pit maintenance control device 14 respectively include a plurality of buttons, that is, each device has a plurality of contacts (for example, the operation button in the emergency electric operation control device 12 needs 3 normally closed contacts and normally open contacts), so that complicated cables are required to connect, which is not only high in cost, but also inconvenient in later maintenance. In addition, the elevator system cannot detect the state of each contact in the above-described devices.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a to above-mentioned urgent electronic operation/maintenance controlling means lead to the problem that the circuit is complicated, with high costs, the later maintenance is inconvenient and can't detect the contact state to the switch board is connected to through the pencil, provide an electron safety plate and elevator electron safety coefficient.
The embodiment of the present invention provides an electronic safety board, which includes a first communication unit, a logic control unit, a first conditioning circuit, a second conditioning circuit, and at least one operation control button; the logic control unit is connected with the operation control button through the first conditioning circuit, is connected with an external operation control device through a second conditioning circuit and a first connecting cable, and sends the states of the operation control button and the operation control device through the first communication unit and a communication bus.
Preferably, the electronic safety board includes a third conditioning circuit, the logic control unit is connected to an external safety switch via the third conditioning circuit and a second connection cable, and the logic control unit sends the state of the safety switch via the first communication unit and a communication bus.
Preferably, the electronic safety board is located in a machine room, and the electronic safety board comprises a second communication unit;
the logic control unit receives signals sent by other electronic safety boards through the second communication unit and the safety serial bus, and sends the operation control button, the operation control device, the state of the safety switch and the signals sent by other electronic safety boards to the machine room control board through the first communication unit and the parallel or serial communication bus.
Preferably, the operation control device is an emergency electric operation control device;
the operation control button comprises an uplink button, an operation button and a downlink button, and the operation control device comprises an emergency stop button and an emergency electric button; or the operation control button comprises an uplink button, an operation button, a downlink button and an emergency electric button, and the operation control device comprises an emergency stop button.
Preferably, the electronic safety board is positioned on the car roof, the operation control device is a car roof maintenance control device, and the logic control unit sends the states of the operation control button, the operation control device and the safety switch to the electronic safety board in the machine room through the first communication unit and the safety serial bus;
the operation control button comprises an uplink button, an operation button and a downlink button, and the operation control device comprises an emergency stop button and an overhaul button; or the operation control button comprises an uplink button, an operation button, a downlink button and an overhaul button, and the operation control device comprises an emergency stop button.
Preferably, the electronic safety board is located in a pit, the operation control device is a pit maintenance control device, and the logic control unit sends the states of the operation control button, the operation control device and the safety switch to the electronic safety board in the machine room through the first communication unit and the safety serial bus;
the operation control button comprises an uplink button, an operation button and a downlink button, and the operation control device comprises an emergency stop button and an overhaul button; or the operation control button comprises an uplink button, an operation button, a downlink button and an overhaul button, and the operation control device comprises an emergency stop button.
The embodiment of the utility model provides an elevator electron safety coefficient is still provided, include the computer lab control panel, by as above the electron safety plate constitute and be located the computer lab electron safety plate of computer lab, just the first communication unit of computer lab electron safety plate is connected with the computer lab control panel via parallel or serial communication bus, and by the computer lab control panel basis operation control button operation control device and safety switch's state control elevator overhauls the operation.
Preferably, the elevator electronic safety system comprises a car top electronic safety plate which is formed by the electronic safety plate and is positioned on the car top;
the machine room electronic safety board further comprises a second communication unit, and the second communication unit of the machine room electronic safety board is connected with the first communication unit of the car top electronic safety board through a safety serial bus.
Preferably, the elevator electronic safety system comprises a pit electronic safety board which is composed of the electronic safety board and is positioned in a pit;
the machine room electronic safety board further comprises a second communication unit, and the second communication unit of the machine room electronic safety board is connected with the first communication unit of the pit electronic safety board through a safety serial bus.
Preferably, the elevator electronic safety system comprises a car top electronic safety plate, the car top electronic safety plate is connected with the machine room electronic safety plate through a safety serial bus, the car top electronic safety plate is connected with a car top overhaul control device through a third connecting cable, and the car top overhaul control device comprises an emergency stop button, an overhaul button, a downlink button, an operation button and an uplink button;
or, elevator electron safety coefficient includes pit electron safety plate, pit electron safety plate pass through safe serial bus with computer lab electron safety plate connects, pit electron safety plate passes through the fourth connecting cable and is connected with pit maintenance controlling means, just pit maintenance controlling means includes scram button, maintenance button, down button, operation button and goes upward the button.
Implement the utility model discloses electron safety plate and elevator electron safety coefficient have following beneficial effect: by integrating the operation control button to the electronic safety plate and realizing the input of the elevator maintenance operation signal together with the operation control device, the connecting circuit of the emergency electric operation/maintenance control device is simplified, the number of contacts in the emergency electric operation/maintenance control device is reduced, and the cost is reduced.
Drawings
FIG. 1 is a schematic connection diagram of a conventional emergency electric operation control device, a car roof maintenance control device and a pit maintenance control device with a control cabinet;
fig. 2 is a schematic view of an electronic security pane provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic safety board provided by an embodiment of the present invention as a machine room safety board;
fig. 4 is a schematic structural diagram of an electronic safety board provided in another embodiment of the present invention as a machine room safety board;
fig. 5 is a schematic view of an electronic elevator safety system provided by an embodiment of the present invention;
fig. 6 is a schematic view of an electronic elevator safety system according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the utility model provides a realize elevator emergency Electric operation/maintenance operation control based on PESSRAL (Programmable Electric Systems in Safety Related Applications for the Lifts), can simplify the wiring of elevator system, reduce elevator system's installation and maintenance cost.
As shown in fig. 2, be the embodiment of the utility model provides an electronic safety board's schematic structure, this electronic safety board 21 can be applied to elevator control system to can make the elevator get into and overhaul running state, whether detect the elevator by electronic safety board 21 promptly and whether triggered the maintenance operation, and when detecting the maintenance operation and triggered, supplementary elevator control system made the elevator get into and overhauls running state.
The electronic safety board 21 of the present embodiment includes a logic control unit 211, a first communication unit 212, at least one operation control button 213, a first conditioning circuit 214, and a second conditioning circuit 215. The logic control unit 211, the first communication unit 212, the operation control button 213, the first conditioning circuit 214, and the second conditioning circuit 215 may be respectively formed by a printed circuit board and an electronic component integrated on the printed circuit board.
The logic control unit 211 is connected to the operation control button 213 (for example, by a conductor on a printed circuit board) via a first conditioning circuit 214, and is connected to the external operation control device 22 via a second conditioning circuit 215 and a first connection cable. The first conditioning circuit 214 and the second conditioning circuit 215 are configured to implement voltage conversion, so as to convert states of the operation control button 213 and the operation control device 22 into corresponding voltage signals, and input the voltage signals to the logic control unit 211, so that the logic control unit 211 can detect states of the operation control button 213 and the operation control device 22 in real time. The operation control buttons 213 are implemented as on-board switches, which are directly disposed on the printed circuit board of the electronic security board 21. Furthermore, the second conditioning circuit 215 may include a plurality of connection terminals (the number of the connection terminals corresponds to the number of the operation buttons or switches of the operation control device 22), and each connection terminal is connected to one operation button or switch of the operation control device 22 (for example, connected to an electrical circuit in which the operation button or switch is located, a sampling element in the electrical circuit, etc.), that is, the level of the connection terminal corresponds to the state of each operation button or switch, and the logic control unit 211 is respectively connected to each connection terminal, so that the logic control unit 211 may collect the level of each connection terminal to obtain the state of the corresponding operation button or switch.
In this embodiment, the logic control Unit 211 may adopt a Micro Controller Unit (MCU), a Programmable Logic Controller (PLC), and the like, and may implement logic operation or processing. The logic control unit 211 is also connected to the first communication unit 212, and uploads the states of the operation control button 213, the operation control device 22, and the safety switch 23 through the first communication unit 212. The states of the operation control button 213, the operation control device 22, and the safety switch 23 are finally received by a machine room control board (the machine room may be connected to a frequency converter, etc., and is used to control the operation of the elevator, such as controlling the car to move up, down, stop, open/close the hall door and the car door, etc., according to an externally input call signal, feedback signals of various sensors or related components, etc.), and the machine room control board controls the operation of the elevator according to the states. For example, when any one of the operation control button 213 and the operation control device 22 is triggered, the machine room control panel controls the elevator to enter an emergency electric operation/maintenance operation state. Specifically, the logic control unit 211 of the electronic safety board 21 may upload the states of the operation control button 213, the operation control device 22, and the safety switch 23 according to a preset period, so that the machine room control board obtains the states of the respective maintenance operation buttons or switches in real time.
The electronic safety board integrates the operation control button 213 into the electronic safety board 21, and realizes the input of the elevator maintenance operation signal together with the operation control device 22, thereby simplifying the connecting circuit of the emergency electric operation/maintenance control device, reducing the number of contacts in the emergency electric operation/maintenance control device and reducing the cost.
In an embodiment of the present invention, the electronic safety board 21 may further include a third conditioning circuit 216, and the third conditioning circuit 216 may be integrated with the logic control unit 211, the first communication unit 212, the operation control button 213, the first conditioning circuit 214, and the second conditioning circuit 215 on the same printed circuit board.
The logic control unit 211 can be connected to an external safety switch 23 via a third conditioning circuit 216 and a second connecting cable. The third conditioning circuit 215 is configured to implement voltage conversion, so as to convert the state of the safety switch 23 into a corresponding voltage signal and input the voltage signal to the logic control unit 211, so that the logic control unit 211 can detect the state of the safety switch 23 in real time.
Of course, in practical applications, the monitoring of the state of the safety switch 23 can also be realized in a conventional manner, such as a conventional safety circuit.
In another embodiment of the present invention, the electronic safety board 21 can be located in a machine room, and at this time, the operation control device 22 connected to the electronic safety board 21 located in the machine room is an emergency electric operation control device, and the corresponding safety switch is a machine room safety switch. The electronic safety board 21 located in the machine room includes a second communication unit in addition to the logic control unit 211, the first communication unit 212, the at least one operation control button 213, the first conditioning circuit 214, the second conditioning circuit 215, and the third conditioning circuit 216. The logic control unit 211 receives signals (maintenance control signals) transmitted by other electronic safety boards via the second communication unit and the safety serial bus, and the logic control unit 211 transmits the operation control button 213, the operation control device 22, the state of the safety switch 23, and signals transmitted by other electronic safety boards to the machine room control board via the first communication unit 212 and the parallel or serial communication bus.
And, the operation control button 213 located on the electronic safety board 21 of the machine room includes an up button, an operation button and a down button, and the operation control device (i.e. the emergency electric operation control device 221) includes an emergency stop button and an emergency electric button, as shown in fig. 3; alternatively, the operation control buttons on the electronic safety board 21 of the machine room include an up button, an operation button, a down button and an emergency electric button, and the operation control device (i.e., the emergency electric operation control device 221) includes an emergency stop button, as shown in fig. 4.
In addition, the electronic safety board 21 shown in fig. 2 may also be located on the car roof, in this case, the operation control device 22 connected to the electronic safety board 21 located on the car roof is a car roof maintenance control device, the corresponding safety switch is a car roof safety switch, the logic control unit 211 of the electronic safety board 21 located on the car roof transmits the states of the operation control button 213, the operation control device 22, and the safety switch 23 to the electronic safety board in the machine room via the first communication unit 212 and the safety serial bus, and the electronic safety board in the machine room transfers the states of the operation control button 213, the operation control device 22, and the safety switch 23 transmitted by the electronic safety board 21 located on the car roof to the machine room control board. The elevator is controlled to enter an emergency electric operation/maintenance operation state by the machine room control panel according to the corresponding state.
The operation control button 213 of the electronic safety plate 21 on the car top comprises an up button, an operation button and a down button, and the operation control device 22 (i.e. the car top maintenance control device) comprises an emergency stop button and a maintenance button; alternatively, the operation control buttons 213 include an up button, an operation button, a down button, and a service button, and the operation control device 22 includes an emergency stop button.
Similarly, the electronic safety board 21 shown in fig. 2 may also be located in a pit, in this case, the operation control device 22 connected to the electronic safety board 21 located in the pit is a pit maintenance control device, the corresponding safety switch is a pit safety switch, and the logic control unit 211 of the electronic safety board 21 located in the pit transmits the states of the operation control button 213, the operation control device 22 and the safety switch 23 to the electronic safety board in the machine room via the first communication unit 212 and the safety serial bus, and the electronic safety board in the machine room uploads the states of the operation control button 213, the operation control device 22 and the safety switch 23 transmitted by the electronic safety board 21 located in the pit to the machine room control board. The elevator is controlled to enter an emergency electric operation/maintenance operation state by the machine room control panel according to the corresponding state.
The operation control button 213 of the electronic safety board 21 located in the pit comprises an up button, an operation button and a down button, and the operation control device 22 (i.e. the pit maintenance control device) comprises an emergency stop button and a maintenance button; alternatively, the operation control buttons 213 include an up button, an operation button, a down button, and a service button, and the operation control device 22 includes an emergency stop button.
As shown in fig. 5, the embodiment of the present invention further provides an elevator electronic safety system, which includes a machine room control board 52, a machine room electronic safety board 51 that is composed of the electronic safety boards 21 shown in fig. 2-4 and is located in the machine room, and the first communication unit of the machine room electronic safety board 51 is connected to the machine room control board 52 via a parallel or serial communication bus, and the machine room control board 52 controls the elevator maintenance operation according to the states of the operation control button, the operation control device 53 (i.e., the emergency electric operation control device) and the safety switch (i.e., the machine room safety switch).
According to the elevator electronic safety system, the elevator overhauling running state information is collected through the machine room electronic safety board 51, and the machine room control board 52 controls the elevator to enter the overhauling running state according to the elevator overhauling running state information. In the above manner, the operation button or switch for elevator maintenance is not required to be connected to the machine room control board 52 through an independent cable, thereby simplifying the circuit and reducing the cost.
In an embodiment of the present invention, the above-mentioned elevator electronic safety system further includes a car top electronic safety board 54 which is composed of the electronic safety board 21 shown in fig. 2 and is located on the car top, and this car top electronic safety board 54 is connected with the car top maintenance control device 55 and the car top safety switch respectively, accordingly, the machine room electronic safety board 51 further includes a second communication unit, the second communication unit of the machine room electronic safety board 51 is connected with the first communication unit of the car top electronic safety board 54 via a safety serial bus, so that the car top electronic safety board 54 can upload the operation control button collected by the car top electronic safety board, the state of the car top maintenance control device 55 and the car top safety switch to the machine room electronic safety board 51, and then upload the machine room electronic safety board 51 to the machine room control board 52 via the first communication unit thereof. The embodiment can further simplify the circuit in the elevator electronic safety system and reduce the cost.
In another embodiment of the invention, the elevator electronic safety system further comprises a pit electronic safety board 56 formed by the electronic safety board 21 as shown in fig. 2 and located in the pit, and the pit electronic safety board 56 is connected with the pit overhaul control device 57 and the pit safety switch, correspondingly, the machine room electronic safety board 51 further comprises a second communication unit, the second communication unit of the machine room electronic safety board 51 is connected with the first communication unit of the pit electronic safety board 56 via a safety serial bus, therefore, the state of the collected operation control button, the pit overhaul control device 57 and the pit safety switch can be uploaded to the machine room electronic safety board 51 by the pit electronic safety board 56, and then the state is uploaded to the machine room control board 52 by the machine room electronic safety board 51 through the first communication unit, so that the circuit in the elevator electronic safety system is further simplified, and the cost is reduced.
In addition, referring to fig. 6, in another embodiment of the elevator electronic safety system of the present invention, the machine room electronic safety board 61 is formed of the electronic safety board shown in any one of fig. 2 to 4, and the machine room electronic safety board 61 is connected to the machine room control board 62 and the emergency electric operation control device 63, respectively, while the car top electronic safety board 64 and the pit electronic safety board 66 do not include operation control buttons.
Specifically, the car top electronic safety board 64 is connected with the machine room electronic safety board 61 through a safety serial bus, the car top electronic safety board 64 is further connected with the car top maintenance control device 65 through a third connecting cable, and the car top maintenance control device 65 includes an emergency stop button, a maintenance button, a downlink button, an operation button, and an uplink button. The car top electronic safety board 64 can collect the states of an emergency stop button, an overhaul button, a downlink button, an operation button and an uplink button of the car top overhaul control device 65, upload the states to the machine room electronic safety board 61 through a safety serial bus, and upload the states to the machine room control board 62 through the first communication unit of the machine room electronic safety board 61. The wiring of the elevator electronic safety system of this embodiment is somewhat more complex than the embodiment of fig. 5.
Similarly, the pit electronic safety board 66 shown in fig. 6 is connected with the machine room electronic safety board 61 through a safety serial bus, the pit electronic safety board 66 is also connected with the pit inspection control device 67 through a fourth connecting cable, and the pit inspection control device 67 includes an emergency stop button, an inspection button, a down button, an operation button, and an up button. The pit electronic safety board 66 can collect the states of an emergency stop button, an overhaul button, a downlink button, an operation button and an uplink button of the pit overhaul control device 67, upload the states to the machine room electronic safety board 61 through the safety serial bus, and upload the states to the machine room control board 62 through the first communication unit of the machine room electronic safety board 61. The wiring of the elevator electronic safety system of this embodiment is somewhat more complex than the embodiment of fig. 5.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An electronic safety board is characterized by comprising a first communication unit, a logic control unit, a first conditioning circuit, a second conditioning circuit and at least one operation control button; the logic control unit is connected with the operation control button through the first conditioning circuit, is connected with an external operation control device through a second conditioning circuit and a first connecting cable, and sends the states of the operation control button and the operation control device through the first communication unit and a communication bus.
2. The electronic safety board according to claim 1, characterized in that the electronic safety board comprises a third conditioning circuit, the logic control unit is connected with an external safety switch via the third conditioning circuit and a second connection cable, and the logic control unit sends the state of the safety switch via the first communication unit and a communication bus.
3. The electronic security pane according to claim 2, wherein the electronic security pane is located in a machine room and the electronic security pane comprises a second communication unit;
the logic control unit receives signals sent by other electronic safety boards through the second communication unit and the safety serial bus, and sends the operation control button, the operation control device, the state of the safety switch and the signals sent by other electronic safety boards to the machine room control board through the first communication unit and the parallel or serial communication bus.
4. The electronic safety board according to claim 3, wherein the operation control device is an emergency electric operation control device;
the operation control button comprises an uplink button, an operation button and a downlink button, and the operation control device comprises an emergency stop button and an emergency electric button; or the operation control button comprises an uplink button, an operation button, a downlink button and an emergency electric button, and the operation control device comprises an emergency stop button.
5. The electronic safety board according to claim 2, wherein the electronic safety board is located on a car roof, the operation control device is a car roof maintenance control device, and the logic control unit sends the states of the operation control button, the operation control device and a safety switch to the electronic safety board in a machine room via the first communication unit and a safety serial bus;
the operation control button comprises an uplink button, an operation button and a downlink button, and the operation control device comprises an emergency stop button and an overhaul button; or the operation control button comprises an uplink button, an operation button, a downlink button and an overhaul button, and the operation control device comprises an emergency stop button.
6. The electronic safety board according to claim 2, wherein the electronic safety board is located in a pit, the operation control device is a pit maintenance control device, and the logic control unit sends the states of the operation control button, the operation control device and a safety switch to the electronic safety board in a machine room via the first communication unit and a safety serial bus;
the operation control button comprises an uplink button, an operation button and a downlink button, and the operation control device comprises an emergency stop button and an overhaul button; or the operation control button comprises an uplink button, an operation button, a downlink button and an overhaul button, and the operation control device comprises an emergency stop button.
7. An elevator electronic safety system, characterized by comprising a machine room control board, a machine room electronic safety board which is composed of the electronic safety board according to any one of claims 1-4 and is located in a machine room, and the first communication unit of the machine room electronic safety board is connected with the machine room control board via a parallel or serial communication bus, and the machine room control board controls the elevator maintenance operation according to the states of the operation control buttons, the operation control device and the safety switch.
8. The elevator electronic safety system of claim 7, comprising a ceiling electronic safety plate constructed from the electronic safety plate of claim 1 and located on a ceiling;
the machine room electronic safety board further comprises a second communication unit, and the second communication unit of the machine room electronic safety board is connected with the first communication unit of the car top electronic safety board through a safety serial bus.
9. The elevator electronic safety system of claim 7, comprising a pit electronic safety board constructed from the electronic safety board of claim 1 and located in a pit;
the machine room electronic safety board further comprises a second communication unit, and the second communication unit of the machine room electronic safety board is connected with the first communication unit of the pit electronic safety board through a safety serial bus.
10. The elevator electronic safety system of claim 7, comprising a ceiling electronic safety board connected to the machine room electronic safety board by a safety serial bus, the ceiling electronic safety board being connected to a ceiling service control device by a third connecting cable, and the ceiling service control device comprising an emergency stop button, a service button, a down button, a run button, and an up button;
or, elevator electron safety coefficient includes pit electron safety plate, pit electron safety plate pass through safe serial bus with computer lab electron safety plate connects, pit electron safety plate passes through the fourth connecting cable and is connected with pit maintenance controlling means, just pit maintenance controlling means includes scram button, maintenance button, down button, operation button and goes upward the button.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021688291.5U CN213568965U (en) | 2020-08-13 | 2020-08-13 | Electronic safety plate and elevator electronic safety system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021688291.5U CN213568965U (en) | 2020-08-13 | 2020-08-13 | Electronic safety plate and elevator electronic safety system |
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| Publication Number | Publication Date |
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| CN213568965U true CN213568965U (en) | 2021-06-29 |
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| CN202021688291.5U Active CN213568965U (en) | 2020-08-13 | 2020-08-13 | Electronic safety plate and elevator electronic safety system |
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