Safety control system

Abstract

The utility model discloses a safety control system. The safety control system comprises a safety execution subsystem, a first subsystem and a second subsystem, the input end of the first subsystem is connected with a signal switch in a lift car, and the input end of the second subsystem is connected with a signal switch in a machine room; a plurality of voting switches are arranged on a power supply line of the safety execution subsystem, the output ends of the first subsystem and the second subsystem are connected with different voting switches respectively, the situation that the cable distribution span of the whole loop is large can be avoided, a high-voltage circuit is adopted, the cable cost and the circuit cost are saved, and when any signal switch is abnormal, the safety performance of the safety execution subsystem is improved. The first subsystem or the second subsystem connected with the abnormal signal switch controls the corresponding voting switch to be switched into the disconnected state so as to disconnect the power supply of the safety execution subsystem, so that the power supply of the safety execution subsystem can be quickly cut off, and the motor is in a band-type brake state so as to guarantee the safety of the elevator. And the specific position of the abnormal signal switch can be directly positioned, so that the maintenance difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator safety, in particular to a safety control system. Background Art

[0002] Elevators are widely used in daily life. With the occurrence of some elevator accidents, elevator safety functions have attracted much attention.

[0003] At present, the safety control system of elevators realizes safety control by using an electrical safety chain, that is, all safety switches and relays are connected in series to form a safety circuit. When any safety switch or relay malfunctions and disconnects, the entire safety circuit is in an open state, so that the brake of the elevator can be controlled to be in a braking state.

[0004] However, in the existing safety control system, safety switches or relays are distributed in various positions, such as the machine room and the car. Therefore, the cable distribution span of the entire safety circuit is very large, increasing the cable cost. And in order to reduce the voltage loss of the cable, a higher voltage circuit needs to be used, resulting in a high circuit cost. When there is voltage loss, it is also not conducive to the control of the working power supply voltage of the safety execution subsystem. Especially when the devices of the safety control execution subsystem are contactors, it is easy to cause faults due to voltage deviation. In addition, when any safety switch or relay malfunctions, it is difficult to directly locate the position of the abnormal switch or relay, resulting in difficulties in maintenance. Summary of the Utility Model

[0005] In order to solve the above technical problems, the utility model provides a safety control system.

[0006] The safety control system is applied to an elevator and includes:

[0007] At least two subsystems, as well as a power supply, a power supply line, a safety execution subsystem, and a main motor that are connected in sequence. The two subsystems are the first subsystem and the second subsystem;

[0008] The input end of the first subsystem is connected to a signal switch in the car, and the input end of the second subsystem is connected to a signal switch in the machine room and / or the hoistway;

[0009] A plurality of voting switches are arranged on the power supply line of the safety execution subsystem. The output ends of the first subsystem and the second subsystem are respectively connected to different voting switches. When any signal switch malfunctions, the first subsystem or the second subsystem connected to the abnormal signal switch controls the corresponding voting switch to switch to an open state to cut off the power supply of the safety execution subsystem.

[0010] In an alternative embodiment, the signal switch connected to the first subsystem includes at least one of a maintenance switch, a maintenance operation switch, a limit switch, a safety gear safety switch, a slack rope safety switch, a mechanical stop safety switch, a car door lock switch, and a leveling inductor.

[0011] In an alternative embodiment, the signal switch connected to the second subsystem includes at least one of an emergency electric changeover switch, an emergency electric operation switch, a buffer safety switch, a speed governor safety switch, and a landing door lock switch.

[0012] In an alternative embodiment, both the first subsystem and the second subsystem include a controller, and a plurality of ports are provided on the controller, and each signal switch is connected to one port.

[0013] In an alternative embodiment, the controllers of the first subsystem and the second subsystem are communicatively connected.

[0014] In an alternative embodiment, a bus communication transceiver connected to the controller is further included in the first subsystem and the second subsystem, and the two bus communication transceivers are connected through a safety communication bus.

[0015] In an alternative embodiment, at least one safety switch is further provided on the power supply line.

[0016] In an alternative embodiment, the safety control system further includes a backup power supply, and when the power supply is cut off, the backup power supply is in a power supply state.

[0017] In an alternative embodiment, a control power supply connected in series with the power supply is included in the safety execution subsystem, and when the power supply or the control power supply is cut off, the safety execution subsystem controls the main motor to stop running.

[0018] In an alternative embodiment, the power supply line is further connected to the input end of the elevator control system, and the output end of the elevator control system is further connected to the input end of the safety execution subsystem.

[0019] In the above safety control system, both the first subsystem and the second subsystem are connected to the voting switch on the power supply line of the safety execution subsystem and can control the state of the voting switch. When any signal switch malfunctions, the power supply of the safety execution subsystem can be quickly cut off, causing the motor to be in a brake state to ensure the safety of the elevator. The input end of the first subsystem is connected to the signal switch in the car, and the input end of the second subsystem is connected to the signal switch in the machine room, which can avoid faults caused by a large span of cable distribution in the entire loop, the use of high-voltage circuits, and voltage deviation, saving cable costs and circuit costs. Moreover, when any signal switch malfunctions, it is possible to directly locate whether the abnormal signal switch is in the car or the machine room, reducing the difficulty of maintenance. In addition, since the main motor can be stopped immediately when any signal switch malfunctions, the abnormal signal of the signal switch can be responded to in real time, without the need for information interaction and judgment between the two subsystems before making a control action, improving the response speed and further ensuring the safety of the elevator.

[0020] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a schematic structural diagram of a safety control system provided by an embodiment of the present invention;

[0023] Figure 2 is a schematic connection diagram of a first subsystem and a signal switch provided by an embodiment of the present invention;

[0024] Figure 3 is a schematic connection diagram of a second subsystem and a signal switch provided by an embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of another safety control system provided by an embodiment of the present invention. Detailed Description of the Embodiments

[0026] To enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] Figure 1 FIG. is a schematic structural diagram of a safety control system provided by an embodiment of the present utility model. As Figure 1 shown, the safety control system includes two subsystems, namely a first subsystem 1 and a second subsystem 2, and a power supply 3, a power supply line 4, a safety execution subsystem 5, and a main motor 6 that are connected in sequence.

[0028] Among them, the input end of the first subsystem 1 is connected to a signal switch in the car, and the input end of the second subsystem 2 is connected to a signal switch in the machine room and / or the hoistway. That is to say, the second subsystem 2 can be connected only to the signal switch in the machine room, or only to the signal switch in the hoistway, or can be connected to the signal switches in both the machine room and the hoistway at the same time.

[0029] In an alternative embodiment, the signal switches in the pit and the out-of-hall position can be connected to the first subsystem or the second subsystem 2. Preferably, each subsystem is connected to the signal switches at most two positions, which can avoid the slow data processing speed of the subsystem due to too many signal switches connected to the subsystem.

[0030] The first subsystem 1 and the second subsystem 2 are usually connected to multiple signal switches. The essence of the signal switch is a sensor. When the signal switch collects a signal, it sends it to the corresponding first subsystem 1 or the second subsystem 2, and the corresponding first subsystem 1 or the second subsystem 2 makes a status judgment.

[0031] A plurality of voting switches are arranged on the power supply line 4. The output ends of the first subsystem 1 and the second subsystem 2 are respectively connected to different voting switches. When any one of the signal switches is abnormal, the first subsystem 1 or the second subsystem 2 connected to the abnormal signal switch controls the corresponding voting switch to switch to the off state to cut off the power supply 3, and the safety execution subsystem 5 controls the main motor 6 to stop running when the power supply 3 is cut off.

[0032] Among them, the main motor 6, i.e., the elevator traction machine, is the power equipment of the elevator, also known as the elevator main machine. Its function is to transmit and deliver power to make the elevator operate. It consists of a motor, a brake, a coupling, a speed reducer, a traction wheel, a frame, a guide wheel, and an attached handwheel for manual disk operation, etc. When the main motor 6 stops running due to an abnormal state of the signal switch, the motor in the main motor 6 stops running and the brake is in the braking state, which can prevent accidents of the elevator and ensure the safety of passengers taking the elevator.

[0033] In an example A, in the normal state, the voting switches on the power supply line 4 are all in the closed state, the power supply 3 supplies power to the safety execution subsystem 5 and the main motor 6, the main motor 6 operates normally. When the first subsystem 1 detects that a certain signal switch in the car is abnormal, it controls the voting switch connected to it to switch to the open state (at this time, the voting switch connected to the second subsystem 2 is still in the closed state), the power supply 3 of the safety execution subsystem 5 and the main motor 6 is cut off, and the safety execution subsystem 5 controls the main motor 6 to stop running to ensure the safety of the elevator.

[0034] In an example B, in the normal state, the voting switches on the power supply line 4 are all in the closed state, the power supply 3 supplies power to the safety execution subsystem 5 and the main motor 6, the main motor 6 operates normally. When the second subsystem 2 detects that a certain signal switch in the machine room is abnormal, it controls the voting switch connected to it to switch to the open state (at this time, the voting switch connected to the first subsystem 1 is still in the closed state), the power supply 3 of the safety execution subsystem 5 and the main motor 6 is cut off, and the safety execution subsystem 5 controls the main motor 6 to stop running to ensure the safety of the elevator.

[0035] In the above safety control system, both the first subsystem and the second subsystem are connected to the voting switches on the power supply line of the safety execution subsystem and can control the state of the voting switches. When any signal switch is abnormal, the power supply of the safety execution subsystem can be quickly cut off, so that the motor is in the braking state to ensure the safety of the elevator. The input end of the first subsystem is connected to the signal switch in the car, and the input end of the second subsystem is connected to the signal switch in the machine room, which can avoid faults caused by a large span of cable distribution in the whole loop, the use of high-voltage circuits, and voltage deviation, saving cable costs and circuit costs. Moreover, when any signal switch is abnormal, it can directly locate whether the abnormal signal switch is in the car or the machine room, reducing the maintenance difficulty.

[0036] In addition, it should be noted that in the prior art, there is also a circuit structure in which two subsystems are connected to each other, and one of the subsystems is connected to the elevator controller. The elevator controller is connected to the safety circuit. Its operating principle is as follows: Subsystem A sends data to Subsystem B, and Subsystem B then sends the data of Subsystem A and the data obtained by itself to the elevator controller together. The elevator controller obtains the status information of all signal switches and makes a judgment. When any signal switch is detected to be abnormal, the elevator controller controls the safety circuit to be disconnected. However, the defect of this circuit structure is that the elevator controller has a large amount of signal volume of the status information to be processed and a slow response speed. In the present invention, the two subsystems operate independently and process data, and the data (signals) processed are of different types. Then, each subsystem has a smaller amount of signal volume of the status information to be processed and a faster response speed. Since the main motor can be stopped when any signal switch is abnormal, the abnormal signal of the signal switch can be responded to in real time, and there is no need for the two subsystems to perform information interaction and signal judgment before making a control action, which improves the response speed and further ensures the safety of the elevator.

[0037] In an optional embodiment, in addition to the above-mentioned first subsystem 1 and second subsystem 2, the safety control system further includes other subsystems. The other subsystems are also connected to the voting switch on the power supply line 4 and can control the on-off of the connected voting switch, and the functions are similar to those of the first subsystem 1 and the second subsystem 2. Exemplarily, the safety control system further includes a third subsystem. The input end of the third subsystem is connected to the signal switch in the pit, and the output end of the third subsystem is connected to the voting switch on the power supply line. When any signal switch in the pit is abnormal, the third subsystem controls the connected voting switch to switch to the off state to cut off the power supply 3, and the main motor 6 can also be stopped. It should be noted here that the signal switch in each position is connected to at most one subsystem. The connection methods and working principles of the remaining subsystems are similar and will not be exemplified one by one.

[0038] In an optional embodiment, as Figure 2 shown in the schematic diagram of the connection between the first subsystem and the signal switch, the signal switch connected to the first subsystem 1 includes at least one of a maintenance switch, a maintenance operation switch, a limit switch, a safety clamp safety switch, a slack rope safety switch, a mechanical stop safety switch, a car door lock switch, and a leveling inductor.

[0039] In an optional embodiment, as Figure 3 shown in the schematic diagram of the connection between the second subsystem and the signal switch, the signal switch connected to the second subsystem 2 includes at least one of an emergency electric changeover switch, an emergency electric operation switch, a buffer safety switch, a speed limiter safety switch, and a landing door lock switch.

[0040] In an alternative embodiment, as Figure 2 , Figure 3 shown, both the first subsystem 1 and the second subsystem 2 include a controller, and a plurality of ports are provided on the controller, and each signal switch is connected to one port. The controller is a programmable electronic controller and also serves as the CPU of the two subsystems. Each signal switch is connected to one port. When any signal switch is abnormal, the position of the abnormal signal switch can be located through the controller, which is beneficial to quickly repair the abnormal switch.

[0041] In an alternative embodiment, as Figure 4 shown in the structural schematic diagram of another safety control system, the controllers of the first subsystem 1 and the second subsystem 2 are communicatively connected. Optionally, a bus communication transceiver connected to the controller is further included in the first subsystem 1 and the second subsystem 2, and the two bus communication transceivers are connected through a safety communication bus. Then, the two controllers can exchange signals through communication to reduce the types of signal switches to be detected. In one example, when the first subsystem 1 detects that the elevator is in an unexpected movement state through a flat floor inductor (signal switch), the abnormal signal is fed back to the second subsystem 2, and then the second subsystem 2 does not need to detect the signal of the landing door lock switch anymore. That is, the number of signal detections can be reduced, and the data processing speed and response speed of the controller can be improved.

[0042] In an alternative embodiment, as Figure 4 shown, at least one safety switch is further provided on the power supply line 4, and the functions of the safety switch include emergency stop, preventing overload and short circuit, preventing overheating, etc. Optionally, the safety switch includes an on-board safety switch and a non-on-board safety switch. Among them, the on-board safety switch includes an on-board safety relay, which is a safety switch installed on the circuit board, and its main function is to detect the circuit state and automatically cut off the power supply. When abnormal conditions such as short circuit, overvoltage, and overcurrent occur in the power supply line 4, the on-board safety switch will be immediately triggered to cut off the circuit to avoid potential safety hazards.

[0043] In an alternative embodiment, the safety control system further includes a backup power supply. When the power supply 3 is cut off, the backup power supply is connected to the power supply line 4 and the backup power supply is in a power supply state. It should be noted here that the backup power supply is only used as a replacement power supply for the power supply 3, and the installation position of the backup power supply is close to the installation position of the power supply 3. Even when the backup power supply is in a power supply state, the voting switch on the power supply line 4 between the backup power supply and the safety execution subsystem still has the function of cutting off the line power supply. Exemplarily, when the power supply 3 is cut off due to a fault or damage, etc., the backup power supply replaces the power supply 3 to supply power, but when any voting switch is disconnected due to an abnormal signal switch, the backup power supply will also be disconnected.

[0044] In an alternative embodiment, as Figure 4 shown, the secure execution subsystem 5 includes a control power source connected in series with the power supply 3. When the power supply 3 or the control power source is cut off, the secure execution subsystem 5 controls the main motor 6 to stop operating. The control power source is used to provide a stable operating power supply for the secure execution subsystem 5.

[0045] In an alternative embodiment, as Figure 4 shown, the power supply line 4 is also connected to the input end of the elevator control system 7, and the output end of the elevator control system 7 is also connected to the input end of the secure execution subsystem 5. Then, the elevator control system 7 can control the main motor 6 through the secure execution subsystem 5. When the elevator control system 7 receives a power-off signal, it sends a stop operation instruction to the main motor 6 through the secure execution subsystem 5, and the secure execution subsystem 5 controls the main motor 6 to stop operating when it receives this instruction. In the case where the power supply 3 is disconnected, the main motor 6 can be controlled to stop operating from multiple aspects to ensure the safety of the elevator.

[0046] In an alternative embodiment, when the elevator control system 7 receives a power-off signal, it switches the elevator operation mode. For example, when the elevator control system 7 receives a power-off signal, it controls the elevator to switch from the normal operation mode to the safe operation mode. For example, in the safe operation mode, it stops responding to the inside and outside call instructions. When there are passengers in the car, it transports the passengers to the nearest floor, which can effectively ensure the safety of the passengers and avoid danger to the passengers due to abnormal signal switches.

[0047] In an alternative embodiment, when the elevator control system 7 is powered on and receives a start signal, it starts a self-check operation, and when the self-check is normal, it controls the main motor 6 to operate through the secure execution subsystem 5. Similarly, when the self-check is abnormal, it controls the main motor 6 to stop operating through the secure execution subsystem 5.

[0048] It should be understood that various forms of the processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is imposed herein.

[0049] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A safety control system, applied to an elevator, characterized in that: include: At least two subsystems, and a power supply, a power supply line, a safety execution subsystem and a main motor connected in sequence, the two subsystems being a first subsystem and a second subsystem; The input end of the first subsystem is connected to a signal switch in the car, and the input end of the second subsystem is connected to a signal switch in the machine room and / or the hoistway; A plurality of voting switches are arranged on the power supply line, and the output ends of the first subsystem and the second subsystem are respectively connected to different voting switches. When any of the signal switches is abnormal, the first subsystem or the second subsystem connected to the abnormal signal switch controls the corresponding voting switch to switch to an off state to cut off the power supply. When the power supply is cut off, the safety execution subsystem controls the main motor to stop running.

2. The safety control system according to claim 1, characterized in that: The signal switch connected to the first subsystem includes at least one of a maintenance switch, a maintenance operation switch, a limit switch, a safety clamp safety switch, a loose rope safety switch, a mechanical stop safety switch, a car door lock switch and a leveling sensor.

3. The safety control system according to claim 1, characterized in that: The signal switch connected to the second subsystem includes at least one of an emergency electric switching switch, an emergency electric operation switch, a buffer safety switch, a speed limiter safety switch and a hall door lock switch.

4. The safety control system according to claim 1, characterized in that: The first subsystem and the second subsystem both include a controller, the controller is provided with a plurality of ports, and each of the signal switches is connected to a port.

5. The safety control system according to claim 4, characterized in that: The controllers of the first subsystem and the second subsystem are communicatively connected.

6. The safety control system according to claim 5, characterized in that: The first subsystem and the second subsystem also include a bus communication transceiver connected to the controller, and the two bus communication transceivers are connected via a safety communication bus.

7. The safety control system according to any one of claims 1 to 6, characterized in that: At least one safety switch is arranged on the power supply line.

8. The safety control system according to any one of claims 1 to 6, characterized in that: It also includes a backup power supply, which is in a power supply state when the power supply is cut off.

9. The safety control system according to any one of claims 1 to 6, characterized in that: The safety execution subsystem includes a control power supply connected in series with the power supply. When the power supply or the control power supply is cut off, the safety execution subsystem controls the main motor to stop running.

10. The safety control system according to any one of claims 1 to 6, characterized in that: The power supply line is also connected to the input end of the elevator control system, and the output end of the elevator control system is also connected to the input end of the safety execution subsystem.

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