A control circuit and an elevator

Abstract

This utility model relates to the field of elevator control circuits, and discloses a control circuit and an elevator. In this utility model, the control circuit includes a safety circuit and a safety monitoring board; wherein the safety circuit includes one or more switches of the same type connected in series, and generates and outputs a first control signal based on the state of the switches; one end of the safety monitoring board is connected to the safety circuit, and the other end is connected to the elevator's contactor; the safety monitoring board, in response to the first control signal, cuts off the power supply to the contactor. Through this control circuit, the elevator does not need to cut off the power supply to the main unit and the brake contactor through the safety circuit, effectively reducing the safety circuit access voltage, reducing circuit insulation costs, and improving safety.

Description

Technical Field

[0001] This utility model relates to the field of elevator control circuits, and in particular to a control circuit and an elevator. Background Technology

[0002] As a commonly used transportation device in public places, the safety of escalators is of paramount importance. Escalators must be equipped with multiple electrical safety devices to immediately stop the machine and prevent restarting when the device is activated.

[0003] In the application of related technologies in escalator safety circuits, safety devices typically employ 110V or 220V safety circuits. These circuits directly cut off the power supply to the main unit and the brake contactor, directly driving a relay to disconnect the power supply to both. This design relies on high voltage for rapid action, but it suffers from problems such as high insulation costs and a significant risk of electric shock. Utility Model Content

[0004] The purpose of this invention is to provide a control circuit and elevator that reduces the safety circuit access voltage, lowers circuit insulation costs, and improves safety.

[0005] To solve the above-mentioned technical problems, the present invention provides a control circuit for an elevator. The control circuit includes a safety circuit and a safety monitoring board. The safety circuit includes one or more switches of the same type connected in series, and generates and outputs a first control signal according to the state of the switches. One end of the safety monitoring board is connected to the safety circuit, and the other end is connected to the contactor of the elevator. In response to the first control signal, the safety monitoring board cuts off the power supply to the contactor.

[0006] Compared with related technologies, this utility model provides a control circuit including a switch module, a safety monitoring board, and a main control board. The switch module forms a safety circuit by connecting multiple switches in series. Opening any one switch will output a control signal to the safety monitoring board. The safety monitoring board processes the first control signal from the safety circuit and controls the elevator's start and stop based on the first control signal. This avoids supplying power to the main unit and brake contactor through the safety circuit, thereby reducing the safety circuit's input voltage, lowering circuit insulation costs, and improving safety. Attached Figure Description

[0007] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0008] Figure 1This is a simplified structural diagram of a control circuit according to an embodiment of the present invention;

[0009] Figure 2 This is a schematic diagram of the control circuit according to an embodiment of the present invention;

[0010] Figure 3 This is a timing diagram of the control signals output by the control circuit according to an embodiment of the present invention. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of the invention. However, the technical solutions claimed in the claims of this utility model can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0012] As can be seen from the background technology, in the application of related technologies in escalator safety circuits, the safety circuit usually cuts off the power supply to the main unit and the brake. During use, the insulation requirements of the safety circuit are extremely high, and the cost of cutting off the main unit and the brake when the safety circuit is activated increases significantly.

[0013] Regarding the design of safety circuits in related technologies, this utility model designs a control circuit including a safety circuit and a safety monitoring board. The switch module forms a safety circuit by connecting multiple switches in series. When any one switch is opened, a control signal is output to its safety monitoring board. The safety monitoring board processes the first control signal from the safety circuit and controls the elevator start and stop according to the first control signal. This avoids supplying power to the main unit and brake contactor through the safety circuit, thereby reducing the voltage connected to the safety circuit, reducing circuit insulation costs, and improving safety.

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0016] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0017] This utility model provides a control circuit for elevators, such as... Figure 1 and Figure 2 This illustrates a preferred embodiment of the control circuit provided by the present invention.

[0018] Please see Figure 1 In this embodiment, the control circuit includes a safety circuit and a safety monitoring board. The safety circuit includes one or more switches of the same type connected in series, and generates and outputs a first control signal according to the state of the switches. One end of the safety monitoring board is connected to the safety circuit, and the other end is connected to the contactor of the elevator. In response to the first control signal, the safety monitoring board cuts off the power supply to the contactor.

[0019] In this embodiment, all switches in the safety circuit are in a closed state. When any one of the switches is opened, the first control signal is generated and output. Specifically, the first switch in the safety circuit connected in series is connected to an external power supply, and the last switch is connected to the safety monitoring board. The safety circuit consists of one or more switches connected in series (such as...). Figure 2 (Such as S11, S21, Sn1, etc.), each switch can be such as an elevator emergency stop switch, a skirt board protection switch, a comb plate switch, etc. Multiple switches connected in series are equivalent to constructing a safety circuit (i.e., Figure 2The safety circuit (as described in the text) is activated when all series switches are closed, indicating normal elevator operation. When any safety switch is activated (e.g., a passenger presses the emergency stop button), the safety circuit is deactivated, indicating an elevator malfunction. The safety circuit generates a trigger signal, i.e., the first control signal. The safety monitoring board responds to this signal by cutting off the power to the main unit and the brake, stopping the elevator. Furthermore, because the safety circuit's input is connected to an external 24V DC power supply, the safety circuit is safer, insulation requirements are reduced, and it is more economical.

[0020] Optionally, in this embodiment, the safety monitoring board further includes an execution unit connected to the safety circuit and the contactor. The execution unit includes a relay; the execution unit responds to the first control signal to control the switch contacts of the relay to close or open, thereby cutting off the power supply to the contactor. Additionally, the safety monitoring board further includes a control unit connected to the execution unit (i.e.,...). Figure 2 The "MCU" in the central safety monitoring board is equipped with a safety system; the safety system outputs a second control signal, and the execution unit responds to the second control signal to control the switch contacts of the relay to close or open, so as to cut off the power supply to the contactor.

[0021] Specifically, the execution unit (i.e. Figure 2 The "execution unit" within the safety monitoring board is the core actuator for escalator safety control. Its function is to respond to the first control signal and quickly control the relay's switch contacts to close or open, thereby cutting off or connecting the power supply to the main unit and brake to stop the escalator. Please continue reading. Figure 2 The execution unit in this embodiment includes a safety relay (such as...). Figure 2 In the context of "SYO" and "SY1", any safety relay's switching contacts include one normally open contact and one normally closed contact. Optionally, in this embodiment, multiple normally open contacts of the relay are connected in series to the main control board, thereby controlling the contactor connected to the main control board to be energized or de-energized (i.e., ...). Figure 2 The contacts 1 and 2 corresponding to "SYO" and "SY1" are both normally open contacts. Figure 2(The contacts 3 and 4 under "SYO" and "SY1" are normally closed contacts). One end of the normally open contact connected in series is connected to the external power supply, and the other end is connected to the main control board. The normally open contact opens in response to the first control signal. When the elevator is running normally, the coils of safety relays SYO and SY1 are energized, and the normally open contacts should be in the closed state. At this time, the main control board and all contactors of the elevator can operate normally. When any switch in the safety circuit is opened, the first control signal is output. At this time, the coils of safety relays SYO and SY1 are de-energized, causing the normally open contacts to change from the closed state to the open state. This disconnects the power supply (i.e., external power supply) to the main control board and the elevator contactors, thereby quickly cutting off or connecting the power supply to the main unit and the brake, ensuring that the escalator stops immediately when the safety device is activated.

[0022] In contrast to normally open contacts, in this embodiment, normally closed contacts of relays are located within the safety monitoring board. Multiple normally closed contacts of relays are connected in parallel, with one end of each normally closed contact connected to the control unit and the other end grounded. The normally closed contacts open or close in response to the first control signal or the second control signal.

[0023] When the elevator is running normally, the coils of safety relays SY0 and SY1 are energized, and their normally closed contacts are open. The safety system deployed in the control unit obtains the contact status of safety relays SY0 and SY1 (i.e., Figure 2 The system uses "SX0" and "SX1" to confirm that the normally open contacts are correctly closed and that the main unit and brake power supply are on. When any switch in the safety circuit is opened, the first control signal is output. At this time, the coils of safety relays SY0 and SY1 are de-energized, causing the normally open contacts to open and the normally closed contacts to close. The signal from the normally closed contacts of the safety system becomes "circuit," indicating that "the safety relay is de-energized, the normally open contacts are open, and the power is cut off." Alternatively, in case of contact adhesion failure: if the normally open contacts cannot open due to the fault (adhesion), even if the coil is de-energized, the normally closed contacts remain open. The safety system detects the abnormal signal and triggers an additional protection mechanism (such as an alarm or forced shutdown). At this time, the safety system outputs a second control signal, and the execution unit responds to the second control signal to control the switch contacts of the relay to close or open. That is, at this time, the normally open contacts of the relay are controlled to change from the closed state to the open state, thereby meeting the safety design requirement of "preventing contact adhesion from causing malfunction" in relevant regulations. Closed-loop detection ensures the reliability of relay operation and prevents the escalator from restarting after the safety device is activated.

[0024] In this way, through the linkage design of normally open and normally closed contacts, the safety relay realizes a closed-loop safety mechanism of "power control-status feedback-fault detection", which not only meets the emergency stop requirements of escalators, but also improves the reliability and safety of the system through redundant design.

[0025] Please see Figure 3 . Figure 3 This diagram illustrates the timing relationships of control signals. The vertical axis represents the position and changes of each signal on the horizontal line segment of the graph, indicating its level state (high or low) at the corresponding time point. The signal labels on the vertical axis clearly distinguish the state changes of different signals. The horizontal axis represents time, serving as the timeline of signal changes. It reflects the state changes of each signal at different times, illustrating the dynamic process of signals over time and helping to understand the sequence of events and the duration of signal states.

[0026] Figure 2 and Figure 3 The meanings and sources of each signal are as follows: Signal A is generated by the series switches (such as emergency stop switches and skirt panel switches) of the safety circuit and is the output of the "safety circuit"; Signal B is reflected by the contact action controlled by safety relays (SYO, SY1) and is the feedback signal of the "safety monitoring board" during execution; Signal C is the output signal of the "safety system" and is used to monitor the status of the safety system. If any signal remains constant at a high level (higher horizontal line in the diagram), it means that the safety circuit is in a normal conducting state and there has been no abnormal disconnection. However, if a falling edge appears at a certain moment, changing the level to low and remaining low, this indicates a fault or abnormal situation in the programmable electronic safety system, triggering a change in the signal state.

[0027] For example, during normal operation: Signal A indicates that the safety circuit is on (i.e., the switch is closed), and the output is a "high level" or "access" signal; Signal C indicates that the programmable safety system is in normal (fault-free) status, and the output is a "high level" or "operation permitted" signal; Signal B indicates that the safety relay coil is energized, the normally open contact is closed, and the power supply to the host and brake is connected (power state "ON" in the timing diagram). During abnormal shutdown, any abnormality in the preceding signal can trigger shutdown: When Signal A is abnormal (such as any safety switch being open), the signal jumps to "low level" or "open circuit," which is equivalent to outputting the first control signal; when Signal C is abnormal (such as the system detecting an overspeed fault), the signal jumps to "low level" or "operation prohibited," and the system outputs the second control signal; subsequently, Signal B responds to Signals A and C, the safety relay coil is de-energized, the normally open contact is opened, the power supply is cut off (power state changes to "OFF" in the timing diagram), and remains in the de-energized state to prevent the equipment from restarting before the fault is resolved.

[0028] like Figure 3The display shows that signals A and C can independently trigger signal B, forming a dual safety mechanism: signal A is used to handle traditional safety switch failures (such as emergency stop actions), while signal C is used to monitor internal system failures (such as intelligent monitoring anomalies). An anomaly in either safety dimension will effectively trigger a shutdown. Furthermore, both signals A and C are transmitted using 24VDC low-voltage transmission, reducing the risk of electric shock. The actuator is controlled by a safety relay, eliminating the need for high-voltage contactors, simplifying the design and reducing system costs.

[0029] Optionally, in this embodiment, the control circuit further includes a main control board; the main control board is connected to a plurality of contactors, and in response to an external control signal, the main control board selects at least one contactor from the plurality of contactors and controls the selected contactor to open or close. In this embodiment, the main control board includes an MCU and a plurality of switches controlled by the MCU; wherein the input terminals of the plurality of switches are all connected to the safety monitoring board, and the output terminals of the plurality of switches are respectively connected to one of the contactors; the plurality of switches, in response to the switch control signal output by the MCU, control the opening or closing of the contactor connected to them.

[0030] Please continue reading. Figure 2 Main control board (i.e.) Figure 2 The "main control board" in the text contains a built-in microcontroller unit (MCU) and multiple parallel switches controlled by the MCU. Figure 2 (Y1 / Y2, Y3, and Y4 / Y5 in the original text). The MCU is controlled by external control signals, outputting control signals through each switch to control the operating state of the corresponding elevator contactor; the MCU on the main control board also detects the safety circuit status (i.e., Figure 2 The "X0" in the code is used for corresponding logic control. Optionally, in this embodiment, the first switch is connected to the elevator's power / transformer contactor, the second switch is connected to the elevator's brake contactor, and the third switch is connected to the elevator's up / down contactor. The switches respond to the switch control signals output by the MCU, controlling the opening or closing of the corresponding contactors. The first switch (i.e., Figure 2 The "Y1 / Y2" pins are connected to the industrial / transformer contactor KMN / KMY to control the escalator's operating mode or power conversion. The second switch (i.e....) Figure 2 The "Y3" pin is connected to the brake contactor KMB to control the release and closing of the brake, thereby braking and running the escalator. The third switch (i.e....) Figure 2 The “Y4 / Y5” pins are connected to the up / down contactors KMU / KMD to control the escalator’s running direction.

[0031] This circuit passes through a safety loop ( Figure 2 "Safety circuit" and safety monitoring board (in the system) Figure 2The "security monitoring board" and the main control board (in the middle) Figure 2 Working in tandem with the "main control board" in the system, relays and contactors are used to achieve precise control over the escalator's operating status, direction, and braking, ensuring the escalator's safe and stable operation.

[0032] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A control circuit for an elevator, characterized in that, The control circuit includes a safety circuit and a safety monitoring board; wherein... The safety circuit includes one or more switches of the same type connected in series, and generates and outputs a first control signal based on the state of the switches; One end of the safety monitoring board is connected to the safety circuit, and the other end is connected to the elevator contactor. In response to the first control signal, the safety monitoring board cuts off the power supply to the contactor.

2. The control circuit according to claim 1, characterized in that, All switches in the safety circuit are closed. When any one of the switches is opened, the first control signal is generated and output.

3. The control circuit according to claim 1, characterized in that, The safety monitoring board also includes an execution unit connected to the safety circuit and the contactor, the execution unit including a relay; The execution unit responds to the first control signal to control the switch contacts of the relay to close or open, thereby cutting off the power supply to the contactor.

4. The control circuit according to claim 3, characterized in that, The security monitoring board also includes a control unit connected to the execution unit, and the control unit is equipped with a security system. The safety system outputs a second control signal, and the execution unit responds to the second control signal to control the switch contacts of the relay to close or open, so as to cut off the power supply to the contactor.

5. The control circuit according to claim 4, characterized in that, The normally open contact of the relay is connected to the contactor; The normally open contact opens in response to the first control signal or the second control signal to cut off the power supply to the contactor.

6. The control circuit according to claim 1, characterized in that, The control circuit also includes a main control board; The main control board is connected to a plurality of contactors. In response to an external control signal, the main control board selects at least one contactor from the plurality of contactors and controls the selected contactor to open or close.

7. The control circuit according to claim 6, characterized in that, The main control board includes an MCU and multiple switches controlled by the MCU; wherein, The input terminals of the multiple switches are all connected to the safety monitoring board, and the output terminal of one switch is connected to one of the contactors. The plurality of switches respond to the switch control signal output by the MCU and control the opening or closing of the contactor connected to them.

8. The control circuit according to claim 7, characterized in that, The output terminal of the switch is connected to one of the contactors, including: The first switch is connected to the elevator's power / transformer contactor, the second switch is connected to the elevator's brake contactor, and the third switch is connected to the elevator's up / down contactor.

9. An elevator, characterized in that, Includes the control circuit as described in any one of claims 1 to 8.

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