CN111703989A - Elevator key control device and elevator key system - Google Patents

Abstract

The invention provides an elevator key control device and an elevator key system, wherein the elevator key control device comprises at least one key control panel cascaded through a bus, the key control panel receives a key control command sent by external equipment through an expansion interface, and a key control circuit on the key control panel analyzes the key control command to determine an elevator key to be controlled by the external equipment and control a corresponding elevator key or control the corresponding elevator key through the corresponding key control panel.

Description

Elevator key control device and elevator key system

technical field

The invention belongs to the technical field of elevator control, and in particular relates to an elevator button control device and an elevator button system.

Background technique

The existing elevator floor key control is connected to the elevator keys or the elevator key board through the key control board. In the case of many floors, the connection is complicated, which is not conducive to management and maintenance, and the number of elevator keys controlled by the key control board is limited and cannot be adapted. Elevator key boards with different numbers of floors have poor compatibility.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an elevator key control device, which aims to solve the problem of poor compatibility of traditional key control boards.

A first aspect of the embodiments of the present invention provides an elevator key control device, the elevator key control device includes at least one key control board cascaded through a bus;

Each of the key control boards includes at least one expansion interface for connecting external devices, a plurality of key interfaces, and a key control circuit electrically connected to the at least one expansion interface and the plurality of key interfaces, respectively. A key control board is electrically connected to the elevator keys in the elevator key board one by one through a plurality of said key interfaces;

The button control circuit is used for:

Acquire the corresponding elevator key state in the elevator key board through a plurality of the key interfaces, receive key control commands sent by the external device through the at least one extension interface, and parse the key control commands to determine the The elevator buttons to be controlled by the external equipment;

When it is determined that the elevator button to be controlled by the external device is an elevator button connected to another button control board, sending the button control instruction to the corresponding button control board; and

When it is determined that the elevator button to be controlled by the external device is an elevator button connected to its own button control board or receives a button control command sent by another button control board, a button trigger signal is sent to the corresponding elevator button to control Corresponding elevator buttons.

In one embodiment, the key control circuit is further configured to obtain the triggering result of the corresponding elevator key, and feed back the triggering result to the key control board at the top of the cascade through the bus, so that all the keys at the top of the cascade are The key control board feeds back the trigger result to the external device through a corresponding expansion interface.

In one embodiment, each of the key control circuits includes a controller, a bus module, a key detection control module and a power supply module;

The bus module, the key detection module and the power module are respectively electrically connected to the controller, the controller is also electrically connected to the expansion interface, and the key detection control module is also electrically connected to the key control module. The plurality of key interfaces in the board are electrically connected, the power module is also electrically connected to the expansion interface and the key detection control module, respectively, and the bus modules are electrically cascaded in sequence;

The button control detection module is used to obtain the elevator button state corresponding to the elevator button board through a plurality of the button interfaces;

The controller is used for:

Receive key control instructions sent by the external device through the at least one extension interface, and parse the key control instructions to determine the elevator keys to be controlled by the external device;

When it is determined that the elevator button to be controlled by the external device is an elevator button connected to another button control board, sending the button control instruction to the corresponding button control board; and

When it is determined that the elevator button to be controlled by the external device is an elevator button connected to its own button control board or receives a button control instruction sent by another button control board, send a button trigger signal to the button control detection module;

The button detection control module is further configured to control the corresponding elevator button trigger action according to the button trigger signal, and feed back the trigger result of the elevator button to the controller;

The controller is further configured to feed back the triggering result to the key control board at the first position of the cascade through the bus module, so that the key control board at the first position in the cascade feeds back the triggering result to the control board. the external device.

In one embodiment, the key control board includes a first key control board to an Mth key control board that are cascaded through a bus, the bus modules of each key control board are cascaded in sequence, and the first key control board The power input end of the power module and the power input end of the bus module are electrically connected with the power supply device, and the power output end of the power module of the first key control board is respectively connected with the controller, the expansion interface, The key detection control module is electrically connected, and the power output end of the bus module of the first key control board is connected with the power input end of the bus module of the adjacent key control board;

The power output terminals of the bus modules from the key control board adjacent to the first key control board to the Mth key control board are electrically connected with the corresponding power supply modules.

In one embodiment, each of the bus modules includes a resistance voltage divider circuit, the resistance voltage divider circuit is electrically connected to the controller, and the resistance voltage divider circuits of each of the bus modules are cascaded in sequence, so that the The resistance voltage dividing circuit of the first button control board is connected to the power supply terminal of the power supply device, and the resistance voltage dividing circuit of the Mth button control board is grounded;

All the resistance voltage divider circuits are used to divide the voltage output by the power supply device in series with resistance voltage, and output voltage signals of different sizes to the controller in the key control board;

Each of the controllers is configured to determine the sequence position of the key control board according to the voltage of the voltage signal, and feed back to the first key control board through the bus module.

In one embodiment, each of the resistor divider circuits includes a first resistor and a second resistor;

The first end of the first resistor is the input end of the resistor divider circuit, and the second end of the first resistor is connected to the first end of the second resistor to form the output end of the resistor divider circuit , the second end of the second resistor is the feedback end of the resistor divider circuit.

In one embodiment, the key control circuit further includes a storage module for storing a parameter configuration file of the key control board, and the storage module is electrically connected to the power module and the controller, respectively.

In one embodiment, the expansion interface includes one or more of a USB interface, a network port, an RS232 interface, an RS485 interface, and a TTL interface.

In one embodiment, the bus module includes a CAN serial bus and/or an RS485 serial bus.

A second aspect of the embodiments of the present invention provides an elevator key system. The elevator key system includes an elevator key board, at least one external device, and the above-mentioned elevator key control device. The elevator key board and the external device are respectively connected to the elevator key board and the external device. The elevator key control device is electrically connected.

In the present invention, the elevator key control device is composed of at least one key control board connected by bus. The key control board is correspondingly set according to the number of elevator keys on the elevator key board. Each key control board can monitor and control a plurality of elevator keys. The control board can be connected to at least one external device, and receives the key control command sent by the external device through the expansion interface, and the key control circuit parses the key control command to determine the elevator key to be controlled by the external device, and after determining the elevator to be controlled by the external device. When the button is an elevator button connected to its own button control board, the button control circuit sends a button trigger signal to the corresponding elevator button to control the elevator button action, such as lighting, extinguishing or sending a floor control signal. After confirming that the external equipment is ready to control When the elevator button is an elevator button connected to another button control board, the button control circuit sends the button control instruction to the corresponding button control board, and the other button control board triggers and controls the elevator button to be controlled. The key control board is modular and can be assembled flexibly according to the number of elevator cases on the elevator key board, so as to realize key control, key management and key state inquiry, etc., which is more flexible and convenient, and can be applied to more kinds of elevator key boards, which improves the elevator key board. Compatibility and reliability of controls.

Description of drawings

1 is a first structural schematic diagram of an elevator key control device provided by an embodiment of the present invention;

FIG. 2 is a second structural schematic diagram of an elevator key control device provided by an embodiment of the present invention;

3 is a first structural schematic diagram of a resistance sampling circuit provided by an embodiment of the present invention;

4 is a schematic diagram of a second structure of a resistance sampling circuit according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an elevator button system according to an embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

A first aspect of the embodiments of the present invention provides an elevator key control device 1 .

As shown in FIG. 1 , the elevator key control device 1 includes at least one key control board cascaded through the bus, wherein when there is only one key control board, the connection between it and the external device also belongs to the cascade relationship.

Each key control board includes at least one expansion interface for connecting external devices 3, multiple key interfaces, and key control circuits electrically connected to the at least one expansion interface and the multiple key interfaces, respectively, and at least one key control board passes through several The key interface is electrically connected with the elevator keys in the elevator key board one by one;

Button control circuit for:

Obtain the corresponding elevator key state in the elevator key board through several key interfaces, and receive the key control command issued by the external device 3 through at least one expansion interface, and analyze the key control command to determine the elevator key that the external device 3 is ready to control;

When it is determined that the elevator button to be controlled by the external device 3 is an elevator button connected with another button control panel, the button control instruction is sent to the corresponding button control panel; and

When it is determined that the elevator button to be controlled by the external device 3 is an elevator button connected to its own button control panel or receives a button control command sent by another button control panel, a button trigger signal is sent to the corresponding elevator button to control the corresponding elevator button. elevator buttons.

In this embodiment, each key control board can monitor and control multiple elevator keys, and the number of key control boards can be set according to the number of elevator keys on the elevator key board 2, satisfying (M-1)*N<X≦M *N, M≧1, M is the number of key control boards, X is the number of elevator keys on the elevator key board 2, N is the number of key interfaces on the key control board, when the elevator key board has different elevator keys, the key control board The number of control panels increases accordingly and is connected to the elevator keys on the elevator key board one by one through the key interface respectively. The key control board is modularized and can be assembled flexibly according to the number of elevator cases on the elevator key board, and can be applied to more types of elevator key boards. The compatibility and reliability of the elevator key control device are improved.

For example, when one key control board can monitor and control 8 elevator keys, when the number of elevator keys on the elevator key board 2 is 15, only 2 key control boards need to be set, and when the number of elevator keys on the elevator key board 2 is 17 When there are multiple key control boards, the multiple key control boards are cascaded in sequence through the bus, and are connected to the corresponding number of elevator keys on the elevator key board 2 through the key interface. For example, when the number of key control boards is 3 and the number of elevator keys is 17, the first key control board 100 and the second key control board 200 are respectively connected to 8 elevator keys, the third key control board is connected to one elevator key, and at the same time Each key control circuit obtains the corresponding connected elevator key state, such as floor information, elevator key lighting state, etc. When multiple key control boards are included, the multiple key boards feed back the connected elevator key state to other key control boards respectively. Each key control board can obtain the elevator key state of other key control boards, and the key control board at the top of the cascade is used as the main key control board for parameter configuration and key control.

Each key control board can be connected to at least one external device 3 through the expansion interface. The external device 3 can include control terminals such as card readers, robots, wireless modules, etc. The expansion interface supports various communication methods including USB interface, network port, RS232 interface, RS485 One or more of an interface and a TTL interface.

When one of the key control boards or a plurality of key control boards receives the key control command sent by the external device 3, the key control circuit in the key control board connected to the external device 3 parses the command and sends a corresponding signal. Control and transmission, for example, when the robot sends out a key control command to control the lighting of the elevator key on the 5th floor, the key control circuit on the key control board connected to it parses the key control command, and determines the elevator key to be controlled. In order to characterize the elevator buttons on the 5th floor, when the elevator button representing the 5th floor is connected to its own button interface, the button control circuit outputs a button trigger signal to the elevator button, thereby controlling the elevator button to light up. When the elevator button representing the 5th floor is connected, the button control command is sent to the button control panel corresponding to the elevator button representing the 5th floor, and the corresponding button control panel controls the elevator button representing the 5th floor to light up, for example, the first The key control board 100 is connected with elevator keys representing floors 1 to 4, and the second key control board 200 is connected with elevator keys representing floors 5 to 8, then the key control circuit on the first key control board 100 forwards the key control instructions To the second key control board 200, the key control circuit on the second key control board 200 performs elevator key control, realizes detection, recognition, execution and feedback of key control instructions, and improves the reliability of key control.

Similarly, other key control boards perform the same action. When the received key control command is to control the elevator key connected to itself, the corresponding elevator key action is controlled. When the received key control command is to control the connection of other key control boards When the elevator button is pressed, the button control instruction is forwarded to the corresponding button control board, and the corresponding button control board executes the elevator button control work.

At the same time, due to the action that the elevator button can be canceled on the individual elevator key board 2, when the button control circuit detects that the elevator button has been manually canceled by mistake, the button control circuit can control the elevator button to light up again, so as to ensure the elevator button is lit. Control reliability.

The key control boards are cascaded through the bus, and transmit the configuration information, control commands, power signals and other signals.

The key control circuit may include a controller, a communication module and other structures, which are specifically set according to requirements.

In the present invention, the elevator key control device 1 is composed of at least one key control board connected by bus. The key control board is correspondingly set according to the number of elevator keys on the elevator key board 2. Each key control board can monitor and control N elevator keys. A key control board can be connected to the external device 3, and receives the key control command issued by the external device 3 through the expansion interface, and the key control circuit parses the key control command to determine the elevator key that the external device 3 is ready to control. When the elevator button to be controlled is an elevator button connected to its own button control board, the button control circuit sends a button trigger signal to the corresponding elevator button to control the elevator button triggering action, such as lighting, extinguishing or issuing a floor control signal. When it is determined that the elevator button to be controlled by the external device 3 is an elevator button connected to another button control board, the button control circuit sends the button control instruction to the corresponding button control board, and the other button control board performs control on the elevator button to be controlled. Trigger control, the present invention modularizes the key control board, which can be assembled flexibly according to the number of elevator cases in the elevator key board 2, so as to realize key control, key management and key state inquiry, etc., which is more flexible and convenient, and can be applied to more kinds of elevators The key board 2 improves the compatibility and reliability of the elevator key control device 1 .

In one embodiment, the key control circuit is further configured to obtain the triggering result of the corresponding elevator key, and feed back the triggering result to the key control board at the top of the cascade through the bus, so that the key control board at the top of the cascade will trigger the The result is fed back to the external device 3 through the corresponding extension interface.

In this embodiment, the first key control board in the cascade and its internal key control circuit are used as the master control of the elevator key control device, and perform operations such as signal feedback, sequence bit numbering of the key control board, etc. When the elevator key triggers an action, the elevator The trigger result corresponding to the key feedback is sent to the key control circuit that outputs the key trigger signal, and the key control circuit feeds back the trigger result to the key control board at the top of the cascade. The key control panel connected to the external device 3 is fed back to the corresponding external device 3 that sends out key control commands.

As shown in FIG. 2 , in one embodiment, each key control circuit includes a controller, a bus module, a key detection control module and a power supply module. For example, the first key control circuit 110 includes a first controller 112 and a first bus module. 114. The first key detection control module 113 and the first power supply module 111, the second key control circuit 210 includes a second controller 212, a second bus module 214, a second key detection control module 213 and a second power supply module 211, the bus The module, the key detection module and the power module are respectively electrically connected to the controller, the controller is also electrically connected to the expansion interface, the key detection control module is also electrically connected to a plurality of key interfaces in the key control board, and the power module is also electrically connected to It is electrically connected with the expansion interface and the key detection control module, and each bus module is electrically cascaded in sequence;

The key control detection module is used to obtain the elevator key state corresponding to the elevator key board through several key interfaces;

Controller for:

Receive the key control command issued by the external device 3 through at least one extended interface, and parse the key control command to determine the elevator keys that the external device 3 is ready to control;

When it is determined that the elevator button to be controlled by the external device 3 is an elevator button connected with another button control panel, the button control instruction is sent to the corresponding button control panel; and

When it is determined that the elevator button to be controlled by the external device 3 is an elevator button connected to its own button control board or receives a button control instruction sent by another button control board, a button trigger signal is sent to the button control detection module;

The button detection control module is also used to control the corresponding elevator button trigger action according to the button trigger signal, and feed back the trigger result of the elevator button to the controller;

The controller is also used for feeding back the triggering result to the key control board at the top of the cascade through the bus module, so that the key control board at the top of the cascade feeds back the triggering result to the external device 3 .

In this embodiment, the power module on each key control board provides working power for other modules on its own key control board, and the key detection control module is the execution unit of the elevator key operation. When receiving the key trigger signal of the controller, Control the corresponding elevator button to light up or cancel the light-on operation, when receiving the controller to query the elevator button state command, detect the elevator button status on the elevator button board 2, and feed it back to the controller to realize the elevator button status detection and control. Control, the power module on each button control board can be an independent power module, or it can be connected to the bus separately and obtain the working power from the bus and perform power conversion output, and the specific structure is not limited.

When there are multiple key control boards, the bus modules of multiple key control boards are cascaded to realize serial expansion. The bus module includes functions such as power supply and communication function transmission, such as parameter configuration information commands, key control commands, status and configuration query commands wait for signal transmission.

When one of the key control boards is connected to the external device 3 and receives a key control command issued by the external device 3, for example, the first key control board 100 located at the top of the cascade receives the signal sent by the external device 3 to control the elevator representing the 5th floor When the button is lit, the first controller 112 analyzes the button control instruction, and determines that the elevator button to be controlled is the elevator button representing the 5th floor. When the elevator button is pressed, the first controller 112 outputs a button trigger signal, the first button detection control module 113, so as to control the elevator button to light up, when the first button interface 120 is not connected to the elevator button representing the 5th floor, then the button The control command is sent to the button control panel corresponding to the elevator button representing the 5th floor, and the button detection control module of the corresponding button control panel controls the elevator button representing the 5th floor to light up, for example, the first button control panel 100 is connected to the symbol 1 The elevator buttons on the 4th floor, the second button control board 200 is connected with the elevator buttons representing the 5th to 8th floors, the controller on the first button control board 100 forwards the button trigger signal to the second button control board 200, and the The second controller 212 and the second key detection control module 213 on the second key control board 200 perform elevator key control, so as to realize the detection, identification, execution and feedback of key control instructions.

Similarly, other connected key control boards perform the same actions, for example, when the second key control board 200 connected adjacent to the first key control board 100 receives the key control command sent by the external device 3 and determines that the key control command is to control itself When the elevator button is connected, the corresponding elevator button action will be controlled. When the received button control command is to control the elevator buttons connected to other button control boards, the button control command will be forwarded to the corresponding button control board. The key control board executes the elevator key control work. When the elevator key is triggered, the trigger result is fed back to the corresponding key detection control module, and the corresponding controller feeds back the trigger result to the first key control board 100 through the bus module. The key control panel 100 feeds back the trigger result to the corresponding external device 3 that sends out key control instructions.

At the same time, because the individual elevator key board 2 has the action that the elevator key can be unlit, the key control detection control module can control the elevator key to light up again when the key control detection control module detects that the elevator key has been unlit by human error.

In this embodiment, each controller can be a controller such as a CPU, a single-chip microcomputer, or an MCU, and the specific structure is not limited. The bus module can use a CAN serial bus or an RS485 serial bus, and the key detection control module can use a detection chip and a switch assembly structure. , in order to detect and control the state of the elevator keys, the specific structure can be selected according to the needs, and no specific restrictions are made here.

As shown in FIG. 2 , in one embodiment, the key control board includes a first key control board 100 to an M-th key control board that are cascaded through a bus, the bus modules of each key control board are cascaded in sequence, and the first key control board The power input end of the power module 100 and the power input end of the bus module are electrically connected to the power supply device, and the power output end of the power module of the first key control board 100 is respectively connected to the controller, the expansion interface, the The key detection control module is electrically connected, and the power output end of the bus module of the first key control board 100 is connected with the power input end of the bus module of the adjacent key control board;

The power output terminals of the bus modules from the key control board adjacent to the first key control board 100 to the Mth key control board are electrically connected with the corresponding power supply modules.

In this embodiment, the first power supply module 111 is provided with working power by a power supply device, and converts the working power and outputs it to each module on the first key control board 100 . At the same time, the first bus module 114 transmits the working power, and The output is output to the adjacent bus modules, and is sequentially transmitted by each bus module until the last bus module. The second power supply module 211 to the Mth power supply module respectively obtain the working power from the corresponding bus module, and convert the working power and output it to the Each module on its own key control board provides working power for each working module of each key control board, so as to start each working module synchronously, and the subsequent cascaded key control board can start work after connecting with the previous key control board. The power supply method is simplified.

In this embodiment, each power module is a power conversion circuit or a power conversion chip, and outputs at least one working voltage to the corresponding module. The power module can be a buck-boost circuit, an LDO voltage regulator circuit, etc. The specific structure can be implemented according to requirements. Setting, no specific restrictions are made here.

As shown in FIG. 4 , in one embodiment, each bus module includes a resistance voltage divider circuit, which is electrically connected to the controller, and the resistance voltage divider circuits of each bus module are cascaded in sequence, and the first button control board The resistance voltage divider circuit of 100 is connected to the power supply terminal of the power supply device, and the resistance voltage divider circuit of the Mth button control board is grounded;

All resistor divider circuits are used to divide the voltage output by the power supply device in series with resistors, and output voltage signals of different sizes to the controller in the key control board;

Each controller is used to determine the sequence position of the key control board according to the voltage of the voltage signal, and feed back to the first key control board 100 through the bus module.

In this embodiment, each key control board on the bus divides and cooperates to control all elevator keys. In order to accurately issue commands to the corresponding key control boards and elevator keys, the sequence of the key control boards is judged by using a voltage sampling method. Identify, sort each button control board in order, the bus module of each button control board is provided with a resistance voltage divider circuit, the resistance voltage divider circuit is connected to the controller, and the resistance voltage divider circuit on each button control board is connected in series, thus A series loop is formed, and voltage sampling signals of different sizes are output to the corresponding controllers. Each controller determines the sequence position of its own key control board according to the voltage magnitude of the obtained voltage sampling signal, and feeds it back to the first key control board 100. , so as to accurately identify and control the serial number of each key control panel.

As shown in FIG. 4 , in one embodiment, each resistor divider circuit includes a first resistor and a second resistor, for example, the first resistor divider circuit 114A includes a first resistor R11 and a second resistor R12 , and the second resistor divides The voltage circuit 214A includes a first resistor R21 and a second resistor R22.

The first end of the first resistor is the input end of the resistor divider circuit, the second end of the first resistor is connected with the first end of the second resistor to form the output end of the resistor divider circuit, and the second end of the second resistor is the resistor The feedback terminal of the voltage divider circuit.

In this embodiment, in order to improve the accuracy, the first resistance and the second resistance of each resistance voltage divider circuit are equal to the resistance values of the first resistance and the second resistance of other resistance voltage divider circuits. When there are M button control boards , the voltage of the voltage sampling signal output by the first resistor divider circuit 114A is VCC/M*(M-1), and the voltage of the voltage sampling signal output by the second resistor divider circuit 214A is VCC/M*(M- 2), the voltage of the voltage sampling signal output by the M-th resistance voltage divider circuit is zero, and each controller obtains each voltage sampling signal to determine its own sequence position, and feeds back to the controller on the first button control board 100 for numbering, When connecting different number of key control boards, the sequence position and automatic numbering of each key control board can be automatically recognized, which improves the reliability of the drive.

In one embodiment, the key control circuit further includes a storage module for storing the parameter configuration file of the key control board, the storage module is electrically connected to the power supply module and the controller respectively, and the storage module may be RAM, ROM, FLASH and other memories.

As shown in FIG. 5, the present invention also proposes an elevator key system, which includes an elevator key board 2, at least one external device 3 and an elevator key control device 1. The specific structure of the elevator key control device 1 refers to the above implementation. For example, since the elevator button system adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. The elevator key board 2 and the external device 3 are respectively electrically connected to the elevator key control device 1 .

In this embodiment, the elevator button control device 1 can be connected to one or more external devices 3, and control the corresponding elevator button triggering action according to the button control instructions issued by the external device 3. In one embodiment, the external device 3 includes a card reader , at least one of a robot and a wireless module.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is still possible to implement the foregoing implementations. The technical solutions described in the examples are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the within the protection scope of the present invention.

Claims (10)

1. an elevator key control device, is characterized in that, comprises at least one key control board that is cascaded by bus; Each of the key control boards includes at least one expansion interface for connecting external devices, a plurality of key interfaces, and a key control circuit electrically connected to the at least one expansion interface and the plurality of key interfaces, respectively. A key control board is electrically connected to the elevator keys in the elevator key board one by one through a plurality of said key interfaces; The button control circuit is used for: Acquire the corresponding elevator key state in the elevator key board through several of the key interfaces, receive key control commands sent by the external device through the at least one extended interface, and parse the key control commands to determine the The elevator buttons to be controlled by the external equipment; When it is determined that the elevator button to be controlled by the external device is an elevator button connected to another button control board, sending the button control instruction to the corresponding button control board; and When it is determined that the elevator button to be controlled by the external device is an elevator button connected to its own button control board or receives a button control command sent by another button control board, a button trigger signal is sent to the corresponding elevator button to control Corresponding elevator buttons. 2. elevator key control device as claimed in claim 1, is characterized in that, described key control circuit is also used to obtain the triggering result of corresponding elevator keypress, and by bus, described triggering result is fed back to the first place in the cascade A key control board, so that the key control board at the first position of the cascade feeds back the triggering result to the external device through a corresponding expansion interface. 3. The elevator key control device as claimed in claim 2, wherein each described key control circuit comprises a controller, a bus module, a key detection control module and a power supply module; The bus module, the key detection module and the power module are respectively electrically connected to the controller, the controller is also electrically connected to the expansion interface, and the key detection control module is also electrically connected to the key control module. The plurality of key interfaces in the board are electrically connected, the power module is also electrically connected to the expansion interface and the key detection control module, respectively, and the bus modules are electrically cascaded in sequence; The button control detection module is used to obtain the elevator button state corresponding to the elevator button board through a plurality of the button interfaces; The controller is used for: Receive key control instructions sent by the external device through the at least one extension interface, and parse the key control instructions to determine the elevator keys to be controlled by the external device; When it is determined that the elevator button to be controlled by the external device is an elevator button connected to another button control board, sending the button control instruction to the corresponding button control board; and When it is determined that the elevator button to be controlled by the external device is an elevator button connected to its own button control board or receives a button control instruction sent by another button control board, send a button trigger signal to the button control detection module; The button detection control module is further configured to control the corresponding elevator button trigger action according to the button trigger signal, and feed back the trigger result of the elevator button to the controller; The controller is further configured to feed back the triggering result to the key control board at the first position of the cascade through the bus module, so that the key control board at the first position in the cascade feeds back the triggering result to the control board. the external device. 4. elevator key control device as claimed in claim 3, is characterized in that, described key control board comprises the first key control board to Mth key control board by bus cascade connection, the bus module of each described key control board cascade in sequence, the power input end of the power supply module of the first key control board and the power input end of the bus module are electrically connected to the power supply device, and the power output end of the power supply module of the first key control board is respectively connected to the power supply device. The controller, the expansion interface, and the key detection control module of the first key control board are electrically connected, and the power output end of the bus module of the first key control board is connected with the power input end of the bus module of the adjacent key control board; The power output terminals of the bus modules from the key control board adjacent to the first key control board to the Mth key control board are electrically connected with the corresponding power supply modules. 5. The elevator key control device according to claim 3, wherein each of the bus modules comprises a resistance voltage divider circuit, the resistance voltage divider circuit is electrically connected with the controller, and each of the bus modules The resistance voltage divider circuits are cascaded in sequence, the resistance voltage divider circuit of the first button control board is connected to the power supply terminal of the power supply device, and the resistance voltage divider circuit of the Mth button control board is grounded; All the resistance voltage divider circuits are used to divide the voltage output by the power supply device in series with resistance voltage, and output voltage signals of different sizes to the controller in the key control board; Each of the controllers is configured to determine the sequence position of the key control board according to the voltage of the voltage signal, and feed back to the first key control board through the bus module. 6. elevator key control device as claimed in claim 5, is characterized in that, each described resistance voltage divider circuit comprises first resistance and second resistance; The first end of the first resistor is the input end of the resistor divider circuit, and the second end of the first resistor is connected to the first end of the second resistor to form the output end of the resistor divider circuit , the second end of the second resistor is the feedback end of the resistor divider circuit. 7. elevator key control device as claimed in claim 3 is characterized in that, described key control circuit also comprises the memory module that is used for storing the parameter configuration file of described key control board, and described memory module and described power supply are respectively The module is electrically connected to the controller. 8. The elevator key control device according to claim 3, wherein the expansion interface comprises one or more of a USB interface, a network port, an RS232 interface, an RS485 interface and a TTL interface. 9 . The elevator key control device according to claim 3 , wherein the bus module comprises a CAN serial bus and/or an RS485 serial bus. 10 . 10. An elevator key system, characterized in that it comprises an elevator key board, at least one external device and the elevator key control device according to any one of claims 1 to 9, wherein the elevator key board and the external device are respectively It is electrically connected with the elevator key control device.

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