Elevator electrical safety protection circuit
By designing elevator electrical safety protection circuits, including maintenance circuits, reset circuits, delay circuits and floor door monitoring circuits, the problem that the existing elevator control system cannot effectively detect elevator door lock failures is solved, and the effect of ensuring the safe operation of the elevator during maintenance is achieved.
Patent Information
- Application Number
- CN202420203950.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-26
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-01-26
AI Technical Summary
The existing elevator control system cannot effectively detect elevator door lock failure, resulting in the possibility of opening the door and walking the elevator, which poses serious safety hazards.
An elevator electrical safety protection circuit is designed, including maintenance circuits, reset circuits, delay circuits and floor door monitoring circuits. Through the combination of these circuits, it is ensured that the elevator cannot operate in the maintenance state until all elevator doors are closed and the buffer and the top guardrail are restored to a safe position.
It effectively avoids the dangerous situation of opening the door and walking the elevator, improves the safety of the elevator, and ensures that the elevator can only be started under safe conditions during maintenance.
Smart Images
Figure CN222593166U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of elevators, in particular to an elevator electrical safety protection circuit. Background Art
[0002] With the continuous development of modern society and architecture, elevators have become an indispensable means of transportation. They can be seen everywhere in subway stations, shopping malls, apartments, office buildings, etc. While elevators bring convenience to people's lives, they also bring certain safety issues to people, such as elevator door lock failure, accidental movement of the car door, car rushing to the top or squatting to the bottom, etc.
[0003] Among them, elevator doors have the highest failure frequency, and opening the door to walk on the elevator will cause more serious accident consequences, and passengers are often trapped, resulting in shearing accidents. In the prior art, the elevator control system uses multiple elevator door locks in series. When the elevator door lock of a certain floor is accidentally short-circuited, for example, when the elevator door lock of a certain floor fails when the personnel are inspecting the elevator door of that floor, causing itself to short-circuit, the elevator control system will not be able to detect the fault, resulting in the situation of opening the door to walk on the elevator, which poses a safety hazard. Utility Model Content
[0004] In view of the above problems in the prior art, the utility model provides an elevator electrical safety protection circuit, which solves the potential safety hazard of the existing elevator when the door is opened and the elevator is moved.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0006] Provided is an elevator electrical safety protection circuit, comprising an inspection circuit, characterized in that it also comprises a reset circuit, a delay circuit and a landing door monitoring circuit connected in parallel; the inspection circuit is connected in series with a first normally closed contact KMB1 of a contactor KMB; the reset circuit comprises a coil KMB of the contactor KMB, the coil KMB is connected in series with an H-type bridge circuit, the upper bridge arm of the H-type bridge circuit comprises a reset button RESET and a first delayed normally open contact KT1 of a delay relay KT connected in series in sequence, and the lower bridge arm of the H-type bridge circuit comprises a second delayed normally open contact KT2 of the delay relay KT and a second normally open contact KMB2 of the contactor KMB connected in series in sequence; the delay circuit comprises a delay coil KT of the delay relay KT, the delay coil KT is connected in series with a normally closed contact KMS of the contactor KMS; the landing door monitoring circuit comprises a coil KMS of the contactor KMS, the coil KMS is connected in series with a plurality of elevator landing door detection switches, the plurality of elevator landing door detection switches are in a one-to-one correspondence with a plurality of elevator doors, and each elevator landing door detection switch is installed on a corresponding elevator door.
[0007] The basic principle of the utility model is: when a person manually opens the elevator door of a certain floor to carry out elevator maintenance, the elevator floor door detection switch on the elevator door is disconnected, the coil KMS is powered off, so that the normally closed contact KMS is disconnected, the delay coil KT is powered off, and the first delayed normally open contact KT1 and the second delayed normally open contact KT2 are both closed, causing the coil KMB to be energized, so that the first normally closed contact KMB1 is disconnected, and the maintenance circuit is disconnected, so that the elevator enters the maintenance state, and thus cannot run, to ensure safety. At this time, the reset button RESET is short-circuited, and even if the reset button RESET is pressed, the elevator cannot be reset. The reset button RESET has the reset function only after the personnel confirms that the maintenance is completed and closes all elevator doors, so as to avoid opening the door and walking on the elevator. Among them, the role of the delay circuit is: to prevent the elevator floor door detection switch from being accidentally opened by personnel during the operation of the elevator, and the delay coil KT still remains energized during the short-term power outage of the coil KMS.
[0008] Furthermore, the elevator electrical safety protection circuit also includes a detection circuit for detecting whether the buffer and the guardrail on the top of the car are in a safe position. The detection circuit is connected in parallel with the reset circuit and includes a buffer in-place switch, a guardrail in-place switch and a coil KDW of a contactor KDW connected in series in sequence. The first normally closed contact KDW1 of the contactor KDW is connected in parallel with the H-type bridge circuit. Only when the in-place switch and the guardrail in-place switch are closed, that is, the buffer and the guardrail on the top of the car are in a safe position, the coil KDW is energized, and the first normally closed contact KDW1 is disconnected, can the reset button RESET not be short-circuited by the first normally closed contact KDW1, thereby avoiding accidents caused by personnel starting the elevator without resetting the buffer and the guardrail on the top of the car during maintenance.
[0009] Furthermore, the elevator electrical safety protection circuit also includes an indicator light circuit connected in parallel with the detection circuit, and the indicator light circuit includes an alarm indicator light and an in-place indicator light connected in parallel, and the alarm indicator light and the in-place indicator light are respectively connected in series with the third normally open contact KMB3 of the contactor KMB and the second normally open contact KDW2 of the contactor KDW. When the elevator is under maintenance, the coil KMB is energized, and the second normally open contact KDW2 is connected, causing the alarm indicator light to light up, which is convenient for reminding personnel that the elevator is in maintenance status. At the same time, only if the buffer and the car top guardrail are in a safe position, the coil KDW is energized, the third normally open contact KMB3 is connected, and the in-place indicator light is on, which facilitates personnel to judge whether the buffer and the car top guardrail are in a safe position.
[0010] Furthermore, the delay time of the delay relay KT is 1 s.
[0011] Furthermore, each elevator door detection switch is a key switch, which is used to manually turn the key to open the elevator door. The elevator door detection switch can only be triggered by manually turning the key. During the normal operation of the elevator, the opening of the elevator door will not affect the opening and closing of the elevator door detection switch.
[0012] Furthermore, the power supply voltage of the reset circuit is 24 V. Since the reset circuit is connected in parallel with the inspection circuit, delay circuit, floor door monitoring circuit, detection circuit and indicator light circuit, the voltage of the entire elevator electrical safety protection circuit is low voltage, which is safe and energy-saving.
[0013] The utility model discloses an elevator electrical safety protection circuit, which has the following beneficial effects:
[0014] 1. The utility model improves the safety of the elevator. After each maintenance of the elevator, the operator is required to conduct a review to ensure that the operator closes all the elevator doors and performs a reset operation to operate the elevator normally, thus avoiding the dangerous situation of opening the door and walking on the elevator.
[0015] 2. The utility model uses a detection circuit to ensure that after maintenance, the personnel must move the buffer and the car top guardrail to a safe position before starting the elevator, thereby avoiding accidents caused by the personnel starting the elevator without resetting the buffer and the car top guardrail during maintenance. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The circuit diagram of the maintenance circuit and the first normally closed contact KMB1;
[0017] Figure 2 Circuit diagram for reset circuit
[0018] Figure 3 is the circuit diagram of the delay circuit;
[0019] Figure 4 This is the circuit diagram of the floor door monitoring circuit;
[0020] Figure 5 A circuit diagram for the detection circuit;
[0021] Figure 6 The circuit diagram of the indicator light circuit; DETAILED DESCRIPTION
[0022] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.
[0023] refer to Figure 1 to Figure 6 This embodiment provides an elevator electrical safety protection circuit, including a parallel maintenance circuit, a reset circuit, a delay circuit, a floor door monitoring circuit, a detection circuit and an indicator light circuit.
[0024] refer to Figure 1 The maintenance circuit is connected in series with the first normally closed contact KMB1 of the contactor KMB; if the first normally closed contact KMB1 is disconnected, the maintenance circuit will be disconnected, causing the elevator to enter the maintenance state, making it unable to run, thus ensuring safety.
[0025] refer to Figure 2 , the reset circuit includes the coil KMB of the contactor KMB, the coil KMB is connected in series with the H-type bridge circuit, the upper bridge arm of the H-type bridge circuit includes the reset button RESET and the first delayed normally open contact KT1 of the delay relay KT connected in series, the lower bridge arm of the H-type bridge circuit includes the second delayed normally open contact KT2 of the delay relay KT and the second normally open contact KMB2 of the contactor KMB connected in series; the line between the reset button RESET and the first delayed normally open contact KT1 is electrically connected to one end of the bridge wire, and the other end of the bridge wire is electrically connected to the line between the second delayed normally open contact KT2 and the second normally open contact KMB2. The first normally closed contact KDW1 of the contactor KDW is connected in parallel with the H-type bridge circuit.
[0026] The power supply voltage of the reset circuit is 24 V. Since the reset circuit is connected in parallel with the inspection circuit, delay circuit, floor door monitoring circuit, detection circuit and indicator light circuit, the voltage of the entire elevator electrical safety protection circuit is low voltage, which is safe and energy-saving.
[0027] The function of the reset circuit is: the first normally closed contact KDW1, the first delayed normally open contact KT1 and the second delayed normally open contact KT2 can all short-circuit the reset button RESET, making the reset button RESET invalid, thereby avoiding the situation where the operator directly presses the reset button RESET to run the elevator and cause an accident without closing all the elevator doors and moving the buffer and car top guardrail to a safe position.
[0028] refer to Figure 3 The delay circuit includes a delay coil KT of a delay relay KT, and the delay coil KT is connected in series with the normally closed contact KMS of the contactor KMS. The delay time of the delay relay KT is 1s.
[0029] The function of the delay circuit is to prevent the elevator door detection switch from being opened by mistake during the operation of the elevator. The delay coil KT remains energized when the coil KMS is powered off for a short period of time.
[0030] refer to Figure 4 The floor door monitoring circuit includes a coil KMS of a contactor KMS. The coil KMS is connected in series with a plurality of elevator floor door detection switches. The plurality of elevator floor door detection switches correspond to a plurality of elevator doors in a one-to-one relationship. Each elevator floor door detection switch is installed on a corresponding elevator door.
[0031] Each elevator door detection switch is a key switch, which is used to manually turn the key to open the elevator door. The elevator door detection switch can only be triggered by manually turning the key. During the normal operation of the elevator, the opening of the elevator door will not affect the switch of the elevator door detection switch.
[0032] The function of the floor door monitoring circuit is: when the operator opens the elevator door for maintenance work, one of the elevator floor door detection switches must be disconnected to cut off the power to the coil KMS.
[0033] refer to Figure 5 The detection circuit is used to detect whether the buffer and the car top guardrail are in a safe position, including a buffer in place switch, a guardrail in place switch and a coil KDW of the contactor KDW which are connected in series in sequence. The first normally closed contact KDW1 of the contactor KDW is connected in parallel with the H-type bridge circuit.
[0034] The function of the detection circuit is as follows: In the prior art, due to the influence of the reserved shaft size of the building, the pit depth and the top floor height of the elevator are usually not enough. When designing, it is necessary to consider using a movable buffer in the pit and a retractable car top guardrail on the car top. When entering the pit and car top for maintenance, it is necessary to manually open the floor door and move the buffer and raise the car top guardrail to ensure the maintenance space. After the operation is completed, the two need to be restored to their normal positions. If they are not restored in place, the car will collide with the buffer and the parts on the top of the shaft during normal operation, which will lead to accidents. The setting of the detection circuit allows the elevator to run only when the in-place switch and the guardrail in-place switch are turned off. That is, the buffer and the car top guardrail are in a safe position, the coil KDW is energized, the first normally closed contact KDW1 is disconnected, and the reset button RESET is not short-circuited by the first normally closed contact KDW1, which avoids the situation that the personnel start the elevator without resetting the buffer and the car top guardrail during maintenance, causing accidents.
[0035] refer to Figure 6 The indicator light circuit includes an alarm indicator light and an in-place indicator light connected in parallel. The alarm indicator light and the in-place indicator light are respectively connected in series with the third normally open contact KMB3 of the contactor KMB and the second normally open contact KDW2 of the contactor KDW. When the elevator is under maintenance, the coil KMB is energized and the second normally open contact KDW2 is connected, causing the alarm indicator light to light up, which is convenient for reminding personnel that the elevator is in maintenance status. At the same time, only if the buffer and the car top guardrail are in a safe position, the coil KDW is energized and the third normally open contact KMB3 is connected, and the in-place indicator light is on. The in-place indicator light is convenient for personnel to judge whether the buffer and the car top guardrail are in a safe position.
[0036] The basic principle of the utility model is:
[0037] When personnel manually open the elevator door of a certain floor for elevator maintenance, the elevator floor door detection switch on the elevator door is disconnected, the coil KMS is de-energized, and thus the normally closed contact KMS is disconnected, the delay coil KT is de-energized, and the first delayed normally open contact KT1 and the second delayed normally open contact KT2 are both closed, causing the coil KMB to be energized, thereby disconnecting the first normally closed contact KMB1, and the maintenance circuit is disconnected, causing the elevator to enter the maintenance state and unable to run to ensure safety. At this time, the reset button RESET is short-circuited, and the elevator cannot be reset even if the reset button RESET is pressed. The reset button RESET will only have the reset function when personnel confirm that the maintenance is completed and close all elevator doors, and put the buffer and car top guardrail in a safe position.
[0038] In summary, the operator of this embodiment must perform a reset operation to start the elevator after each maintenance of the elevator, which ensures that the operator closes all elevator doors and places the buffer and car top guardrail in normal positions, thereby improving the safety of the elevator.
[0039] Although the specific implementation of the utility model is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.
Claims
1. An elevator electrical safety protection circuit, including a maintenance circuit, characterized in that: It also includes a parallel reset circuit, a delay circuit and a landing door monitoring circuit; The maintenance circuit is connected in series with the first normally closed contact KMB1 of the contactor KMB; The reset circuit includes a coil KMB of the contactor KMB, the coil KMB is connected in series with an H-type bridge circuit, the upper bridge arm of the H-type bridge circuit includes a reset button RESET and a first delayed normally open contact KT1 of a delay relay KT connected in series in sequence, and the lower bridge arm of the H-type bridge circuit includes a second delayed normally open contact KT2 of the delay relay KT and a second normally open contact KMB2 of the contactor KMB connected in series in sequence; The delay circuit includes a delay coil KT of a delay relay KT, and the delay coil KT is connected in series with a normally closed contact KMS of a contactor KMS; The floor door monitoring circuit includes a coil KMS of the contactor KMS, and the coil KMS is connected in series with a plurality of elevator floor door detection switches. The plurality of elevator floor door detection switches are in a one-to-one correspondence with a plurality of elevator doors, and each elevator floor door detection switch is installed on the corresponding elevator door.
2. The elevator electrical safety protection circuit according to claim 1, characterized in that: It also includes a detection circuit for detecting whether the buffer and the car roof guardrail are in a safe position. The detection circuit is connected in parallel with the reset circuit and includes a buffer in-place switch, a guardrail in-place switch and a coil KDW of a contactor KDW connected in series in sequence. The first normally closed contact KDW1 of the contactor KDW is connected in parallel with the H-type bridge circuit.
3. The elevator electrical safety protection circuit according to claim 2, characterized in that: It also includes an indicator light circuit connected in parallel with the detection circuit, and the indicator light circuit includes an alarm indicator light and an arrival indicator light connected in parallel, and the alarm indicator light and the arrival indicator light are respectively connected in series with the third normally open contact KMB3 of the contactor KMB and the second normally open contact KDW2 of the contactor KDW.
4. The elevator electrical safety protection circuit according to claim 2, characterized in that: The delay time of the delay relay KT is 1s.
5. The elevator electrical safety protection circuit according to claim 1, characterized in that: Each elevator door detection switch is a key switch, which is used to manually turn the key to open the elevator door.
6. The elevator electrical safety protection circuit according to any one of claims 1 to 5, characterized in that: The power supply voltage of the reset circuit is 24V.