Safety circuit system and method for maintenance personnel to enter car roof for operation

Abstract

The invention discloses a safety circuit system and method for maintenance personnel to enter a car roof for operation, and the system comprises an elevator main control board, a car maintenance switch, a door lock loop, a buzzer, a maintenance state indicating lamp, an arrival indicating lamp, a car roof lighting switch, a hoistway lighting switch, an outbound box and a car operation box. The lift car maintenance switch is arranged in a maintenance box of the lift car operation box, a first input point of the lift main control panel is connected with the lift car maintenance switch, and a second input point of the lift main control panel is connected with the door lock loop through a first passive output point. A first active output point, a second active output point and a third active output point of the elevator main control board are connected with a buzzer, a maintenance state indicating lamp and an arrival indicating lamp respectively, and a second passive output point of the elevator main control board is connected with a car roof illuminating lamp through a car roof illuminating switch and connected with a plurality of hoistway lamps through a plurality of hoistway illuminating switches respectively. And the outbound box and the car operation box are communicated with the elevator main control panel through a CAN (Controller Area Network). According to the invention, the personal safety of maintenance personnel can be effectively protected.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator maintenance, and particularly relates to a safety circuit system and method for maintenance personnel to enter the car top for operation. Background Art

[0002] In the existing elevator design, when maintenance personnel need to enter the car top to perform maintenance operations on the elevator, they need to go to the floor where the machine room or control cabinet is located, and use the emergency electric drive of the control cabinet to run the elevator to a suitable position. This method is time-consuming and laborious; even many maintenance personnel, for convenience, directly press the in-car call button to start the elevator, and use a triangular key to open the landing door during operation to enter the car top for operation. This illegal operation not only damages the elevator system, but also poses a danger to the operators. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a safety circuit system and method for maintenance personnel to enter the car top for operation.

[0004] The technical solution of the present invention is as follows:

[0005] A safety circuit system for maintenance personnel to enter the car top for operation, comprising an elevator main control board, a car maintenance switch, a door lock circuit, a buzzer, a maintenance status indicator light, a arrival station indicator light, a car top lighting switch, a hoistway lighting switch, an external call box and a car operation panel. The elevator main control board has a first input point, a second input point, a first input common point, a second input common point, a first passive output point, a second passive output point, a first active output point, a second active output point, a third active output point and an output common point. The car maintenance switch is arranged in the inspection box of the car operation panel. The first input point of the elevator main control board is connected to the car maintenance switch and is jointly connected to a DC24V power supply with the first input common point. The door lock circuit is connected to the safety circuit power supply. The second input point of the elevator main control board is connected to one end of the door lock circuit through the first passive output point, and the other end of the door lock circuit is connected to the second input common point of the elevator main control board. The first active output point of the elevator main control board is connected to the buzzer, the second active output point is connected to the maintenance status indicator light, the third active output point is connected to the arrival station indicator light, and they are jointly connected to a DC24V power supply with the output common point. The second passive output point of the elevator main control board is respectively connected to the car top lighting lamp through the car top lighting switch and to a plurality of hoistway lights through a plurality of hoistway lighting switches. The external call box and the car operation panel are in CAN communication with the elevator main control board.

[0006] The door lock circuit includes an emergency stop switch, a safety circuit switch, a door lock switch, a rising edge detector, and a door lock contactor. The emergency stop switch, the safety circuit switch, and the door lock switch are connected in series in sequence. The first passive output point of the elevator main control board is connected to the door lock switch through the rising edge detector. The second input common point of the elevator main control board is connected to the door lock switch through the door lock contactor.

[0007] A safety method for maintenance personnel to enter the car top for operation. When the elevator needs maintenance, the maintenance personnel enter the car and use a special key to open the inspection box of the car operation panel, turn the car maintenance switch to the OK state. The car operation panel deletes all registered inside and outside call commands. The first passive output point and the second active output point of the elevator main control board output to light up the maintenance status indicator light. Then the maintenance personnel get out of the car to the outside of the floor, and the elevator closes the door. At this time, the second input point of the elevator main control board detects a valid rising edge signal of the door lock, shields the door opening and closing signals, and the second passive output point of the elevator main control board outputs to light up the car top lighting lamp and the hoistway lamp. Then the maintenance personnel press the up or down button of the outside call on the current floor through the outside call box and upload it to the elevator main control board through CAN communication, and the elevator runs. When the elevator runs to the position, the first active output point and the third active output point of the elevator main control board output to start the buzzer to buzz and light up the in-place indicator light. At this time, the maintenance personnel can open the corresponding floor door and then enter the car top for operation. When the maintenance personnel enter the car top and rotate the car top inspection switch to the inspection state, the first passive output point, the third active output point, and the first active output point of the elevator main control board stop outputting. The second active output point and the second passive output point of the elevator main control board stop outputting only when no signal is input to the first input point.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: When the elevator is maintained, the present invention can effectively protect the personal safety of the maintenance personnel and at the same time protect the elevator system without causing damage to the elevator system. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] 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 use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0010] Figure 1 It is a circuit schematic diagram of a safety circuit system for maintenance personnel to enter the car top provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, 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 and are not used to limit the present invention.

[0012] In order to illustrate the technical solutions described in the present invention, the following will be described through specific embodiments.

[0013] Embodiment

[0014] Please refer to Figure 1 , this embodiment provides a safety circuit system for maintenance personnel to enter the car top for operation, including an elevator main control board, a car maintenance switch, a door lock circuit, a buzzer, a maintenance status indicator light, an arrival indicator light, a car top lighting switch, a hoistway lighting switch, an outer call box, and a car operation panel. The elevator main control board has a first input point, a second input point, a first input common point, a second input common point, a first passive output point, a second passive output point, a first active output point, a second active output point, a third active output point, and an output common point. The car maintenance switch is arranged in the inspection box of the car operation panel. The first input point of the elevator main control board is connected to the car maintenance switch and is jointly connected to the DC24V power supply with the first input common point. The door lock circuit is connected to the safety circuit power supply. The second input point of the elevator main control board is connected to one end of the door lock circuit through the first passive output point, and the other end of the door lock circuit is connected to the second input common point of the elevator main control board. The first active output point of the elevator main control board is connected to the buzzer, the second active output point is connected to the maintenance status indicator light, the third active output point is connected to the arrival indicator light, and they are jointly connected to the DC24V power supply with the output common point. The second passive output point of the elevator main control board is respectively connected to the car top lighting lamp through the car top lighting switch and to several hoistway lamps through several hoistway lighting switches. The outer call box and the car operation panel communicate with the elevator main control board through CAN.

[0015] Among them, the door lock circuit includes an emergency stop switch, a safety circuit switch, a door lock switch, a rising edge detector, and a door lock contactor. The emergency stop switch, the safety circuit switch, and the door lock switch are connected in series in sequence. The first passive output point of the elevator main control board is connected to the door lock switch through the rising edge detector. The second input common point of the elevator main control board is connected to the door lock switch through the door lock contactor.

[0016] A safety method for maintenance personnel to enter the car top for operation. When the elevator needs maintenance, the maintenance personnel only need to enter the car according to the normal operation of taking the elevator, press the in-car call button to go to the appropriate floor (taking the 2nd floor as an example). The elevator runs to the 2nd floor and opens the door. The maintenance personnel enter the car and use a special key to open the inspection box of the car operation panel, turn the car maintenance switch to the OK state. The car operation panel deletes all registered in-car and out-car call commands. The first passive output point and the second active output point of the elevator main control board output to light up the maintenance status indicator light. Then the maintenance personnel get out of the car to the outside of the floor. The elevator closes the door. At this time, the second input point of the elevator main control board detects the valid rising edge signal of the door lock, shields the door opening and closing signals, and the second passive output point of the elevator main control board outputs to light up the car top lighting and the hoistway lighting. Then the maintenance personnel press the up or down button of the current floor out-car call through the out-car call box and upload it to the elevator main control board through CAN communication, and the elevator runs. If the up button of the out-car call is pressed, the elevator automatically runs up by the current floor height - 2000mm (taking the car height of 2 meters as an example) + 200mm. When the elevator runs in place, the first active output point and the third active output point of the elevator main control board output to start the buzzer to beep and light up the in-place indicator light. At this time, the maintenance personnel only need to open the landing door on the 3rd floor to enter the car top for operation. If the down button of the out-car call is pressed, the elevator automatically runs down by 1800mm. At this time, the maintenance personnel only need to open the landing door on the 2nd floor to enter the car top for operation. When the maintenance personnel enter the car top and rotate the car top inspection switch to the inspection state, the first passive output point, the third active output point and the first active output point of the elevator main control board stop outputting. The second active output point and the second passive output point of the elevator main control board only stop outputting when it detects that there is no signal input at the first input point (that is, the car maintenance switch is reset).

[0017] The process of realizing the elevator running distance is as follows: Add main board parameters K1~Kn: floor pulse number (obtained through hoistway learning, 1000 pulses = 1000mm, the higher the floor, the larger the pulse); parameter A1: current car position pulse number. Taking the 2nd floor as an example, if K1 = 10000 and the height of the 1st floor is 3000mm, then K2 is about 13000. If the height of the 2nd floor is 5000mm and the car height is 2000mm, then when the maintenance personnel operate the maintenance switch and press the up button of the 2nd floor out-car call, the elevator automatically runs up by a distance of 5000 - 2000 + 200 = 3200mm, which is converted to 3200 pulses. That is, when A1 is 13000 + 3200 = 16200 pulses, the elevator stops running. If the maintenance personnel press the down button of the 2nd floor out-car call, the elevator automatically runs down by a distance of 2000 - 200 = 1800mm, which is converted to 1800 pulses. That is, when A1 is 13000 - 1800 = 11200 pulses, the elevator stops running.

[0018] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. 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 circuit system for maintenance personnel to enter the car top for operation, characterized in that: It includes an elevator main control board, a car maintenance switch, a door lock circuit, a buzzer, a maintenance status indicator light, a landing indicator light, a car top lighting switch, a hoistway lighting switch, an external call box, and a car operation panel. The elevator main control board has a first input point, a second input point, a first input common point, a second input common point, a first passive output point, a second passive output point, a first active output point, a second active output point, a third active output point, and an output common point. The car maintenance switch is arranged in the inspection box of the car operation panel. The first input point of the elevator main control board is connected to the car maintenance switch and is jointly connected to a DC24V power supply with the first input common point. The door lock circuit is connected to the power supply of the safety circuit. The second input point of the elevator main control board is connected to one end of the door lock circuit through the first passive output point, and the other end of the door lock circuit is connected to the second input common point of the elevator main control board. The first active output point of the elevator main control board is connected to the buzzer, the second active output point is connected to the maintenance status indicator light, the third active output point is connected to the landing indicator light, and they are jointly connected to a DC24V power supply with the output common point. The second passive output point of the elevator main control board is respectively connected to the car top lighting lamp through the car top lighting switch and to several hoistway lights through several hoistway lighting switches. The external call box and the car operation panel communicate with the elevator main control board through CAN communication.

2. The safety circuit system for maintenance personnel to enter the car top for operation according to claim 1, characterized in that: The door lock circuit includes an emergency stop switch, a safety circuit switch, a door lock switch, a rising edge detector, and a door lock contactor. The emergency stop switch, the safety circuit switch, and the door lock switch are connected in series in sequence. The first passive output point of the elevator main control board is connected to the door lock switch through the rising edge detector. The second input common point of the elevator main control board is connected to the door lock switch through the door lock contactor.

3. A safety method for maintenance personnel to enter the car top for operation, characterized in that: A safety circuit system for maintenance personnel to enter the car top for operation as claimed in claim 1 or 2; when the elevator needs maintenance, the maintenance personnel enter the car, open the inspection box of the car operation panel with a special key, turn the car maintenance switch to the OK state, the car operation panel deletes all registered inside and outside call commands, the first passive output point and the second active output point of the elevator main control board output to light up the maintenance status indicator; then the maintenance personnel go out of the car to the outside of the floor, the elevator doors close, at this time the second input point of the elevator main control board detects the valid signal of the rising edge of the door lock, shields the door opening and closing signal and the second passive output point of the elevator main control board outputs to light up the car top lighting lamp and the hoistway lamp; then the maintenance personnel press the up or down button of the outside call box at the current floor and upload it to the elevator main control board through CAN communication, and the elevator runs; when the elevator runs to the position, the first active output point and the third active output point of the elevator main control board output to start the buzzer to beep and light up the in-position indicator, at this time the maintenance personnel can open the corresponding landing door and then enter the car top for operation; when the maintenance personnel enter the car top and rotate the car top inspection switch to the inspection state, the first passive output point, the third active output point and the first active output point of the elevator main control board stop outputting, and the second active output point and the second passive output point of the elevator main control board stop outputting only when no signal is input to the first input point is detected.

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