Elevator safety protection system

Abstract

The utility model discloses an elevator safety protection system which comprises an a1 detection switch, an a2 detection switch, a b1 detection switch, a b2 detection switch and a safety protection device, and the a1 detection switch and the a2 detection switch are arranged above a bottom landing door sill on the inner wall of an elevator shaft in a vertically spaced mode and are close to the bottom landing door sill. The b2 detection switch and the b1 detection switch are arranged below a top layer landing door sill on the inner wall of an elevator shaft in a vertically spaced mode and are close to the top layer landing door sill, the safety protection device is arranged in a machine room on the top of the elevator shaft, and the power supply end of the safety protection device is connected with a power source. The signal input end of the safety protection device MCU is connected with the a1 detection switch, the a2 detection switch, the b1 detection switch and the b2 detection switch, and the signal output end of the safety protection device MCU is connected with an elevator main power source located in a machine room. According to the utility model, external safety redundancy is added to the elevator, and the safety performance of the elevator is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to elevator safety technical field, concretely relates to an elevator safety protection system. BACKGROUND

[0002] There are many safety protections in elevator design, including hardware and software, but software protection is limited to program internal operation logic design safety redundancy, and when the program is out of control, there is lack of external safety protection for such program out of control.

[0003] At present, such accidents have occurred, the elevator runs directly squat to the car buffer, and then reversely runs to the top floor and hits the top, the counterweight is pressed to the counterweight buffer, and moreover, the elevator keeps running, keeps squatting to the bottom and hitting the top, and the personnel in the car keeps being injured by the car squatting to the bottom and hitting the top, and this situation is mainly that part of the internal semiconductor of the main control chip is broken down, and the breakdown mainly comes from the conducted disturbance in EMC, and now, there are more and more electric equipment in the society, and the electric circuit is unstable, especially there are a large number of distorted voltage waves and distorted harmonic currents on the circuit, and such distortion cannot be eliminated even if there are filters and reactors. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the defects of prior art, providing an elevator safety protection system, which adds external safety redundancy to the elevator, thereby improving the safety performance of the elevator.

[0005] The technical scheme of the utility model is as follows:

[0006] An elevator safety protection system, comprising a1 detection switch, a2 detection switch, b1 detection switch, b2 detection switch and safety protection device, the a1 detection switch and the a2 detection switch are arranged on the bottom layer door sill of the elevator shaft inner wall above and close to the bottom layer door sill, the b2 detection switch and the b1 detection switch are arranged on the top layer door sill of the elevator shaft inner wall below and close to the top layer door sill, the safety protection device is arranged in the machine room at the top of the elevator shaft, the power supply end of the safety protection device is connected with the power supply, the signal input end of the safety protection device MCU is connected with the a1 detection switch, the a2 detection switch, the b1 detection switch and the b2 detection switch respectively, and the signal output end of the safety protection device MCU is connected with the elevator general power supply in the machine room.

[0007] Among them, the safety protection device is provided with a threshold parameter V of detected speed;

[0008] When the elevator runs downward, the elevator car runs to the a1 detection switch, the safety protection device starts timing, when reaching the a2 detection switch, the timing ends, the speed V1 of the elevator at this time is calculated according to the distance between the a1 detection switch and the a2 detection switch, when the speed V1 exceeds the threshold parameter V, the safety protection device outputs to disconnect the total power supply of the elevator;

[0009] When the elevator runs upward, the elevator car runs to the b1 detection switch, the safety protection device starts timing, when reaching the b2 detection switch, the timing ends, the speed V2 of the elevator at this time is calculated according to the distance between the b1 detection switch and the b2 detection switch, when the speed V2 exceeds the threshold parameter V, the safety protection device outputs to disconnect the total power supply of the elevator.

[0010] Further, the elevator safety protection system further comprises a buffer, which is arranged at the bottom of the elevator shaft.

[0011] With respect to the prior art, the beneficial effects of the utility model lie in that: the utility model has a1 detection switch and a2 detection switch arranged above and below the bottom layer landing sill of the inner wall of the elevator shaft, has b2 detection switch and b1 detection switch arranged above and below the top layer landing sill of the inner wall of the elevator shaft, and has a safety protection device arranged in the machine room at the top, the safety protection device has a threshold parameter V of detected speed, when the elevator runs downward, the elevator car runs to the a1 detection switch, the safety protection device starts timing, when reaching the a2 detection switch, the timing ends, the speed V1 of the elevator at this time is calculated according to the distance between the a1 detection switch and the a2 detection switch, when the speed V1 exceeds the threshold parameter V, the safety protection device outputs to disconnect the total power supply of the elevator, when the elevator runs upward, the elevator car runs to the b1 detection switch, the safety protection device starts timing, when reaching the b2 detection switch, the timing ends, the speed V2 of the elevator at this time is calculated according to the distance between the b1 detection switch and the b2 detection switch, when the speed V2 exceeds the threshold parameter V, the safety protection device outputs to disconnect the total power supply of the elevator. The utility model adds external safety redundancy to the elevator, thereby improving the safety performance of the elevator. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0013] Fig. 1 The system composition block diagram of the elevator safety protection system provided by the utility model is shown in the figure.

[0014] Fig. 2 The utility model provides a detection component installation schematic drawing of elevator safety protection system,

[0015] Fig. 3 The utility model provides a circuit schematic drawing of elevator safety protection system. DETAILED DESCRIPTION

[0016] In order to make the utility model purposes, technical scheme and advantages more clearly, following combining with the utility model is further detailed with the embodiment of the drawings.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0017] In order to explain the technical scheme described in the utility model, the following is explained by specific embodiment.

[0018] EMBODIMENT

[0019] Please refer to Figs. 1-3 The utility model provides a kind of elevator safety protection system, including a1 detection switch 1, a2 detection switch 2, b1 detection switch 3, b2 detection switch 4, safety protection device 5 and buffer 6, a1 detection switch 1 and a2 detection switch 2 are arranged on the bottom floor door sill 10 in the elevator shaft inner wall top and close to bottom floor door sill 10 with interval, b2 detection switch 4 and b1 detection switch 3 are arranged below the top floor door sill 20 in the elevator shaft inner wall with interval and close to top floor door sill 20, safety protection device 5 is arranged in the machine room 30 of elevator shaft top, the power supply of safety protection device 5 is connected, the signal input end of safety protection device 5 MCU is connected with a1 detection switch 1, a2 detection switch 2, b1 detection switch 3, b2 detection switch 4 respectively, the signal output end of safety protection device 5 MCU is connected with the elevator main power supply 40 located in machine room 30, buffer 6 is arranged in the bottom of elevator shaft.

[0020] Threshold parameter V is set in the safety protection device 5 by setting detection speed.

[0021] When elevator runs downward, elevator car runs to a1 detection switch 1, safety protection device 5 starts timing, when reaching a2 detection switch 2, timing ends, according to the distance L1 between a1 detection switch 1 and a2 detection switch 2, the speed V1 of elevator at this time is calculated, when the speed V1 exceeds threshold parameter V, safety protection device 5 outputs to disconnect elevator main power supply.

[0022] When the elevator runs upward, the elevator car runs to the b1 detection switch 3, the safety protection device 5 starts timing, when reaching the b2 detection switch 4, the timing ends, the speed V2 of the elevator at this time is calculated according to the distance L1 between the b1 detection switch 3 and the b2 detection switch 4, when the speed V2 exceeds the threshold parameter V, the safety protection device 5 outputs to disconnect the elevator main power supply 40.

[0023] Wherein, the distance L1 between the a1 detection switch 1 and the a2 detection switch 2, the distance L2 between the a2 detection switch 2 and the bottom landing sill 10, the distance L1 between the b1 detection switch 3 and the b2 detection switch 4, and the distance L2 between the b2 detection switch 4 and the top landing sill 20 can be adjusted according to the rated speed of the elevator and system requirements on site.

[0024] L1, L2 installation distance is determined. For example, the rated speed of the elevator is 3m / s, the running end station speed of the elevator is pre-decelerated to stop at a speed not greater than 0.8m / s (which can be adjusted according to requirements), the elevator buffer overtravel is 500mm, and the human body can withstand an acceleration of 3.5m / s 2 without injury. The brake friction force of the elevator gradually increases, so that the deceleration gradually increases, thereby the acceleration of the elevator car is continuously reduced from 9.8m / s 2 to 0m / s 2 , and 0.5s is needed, so from 9.8m / s 2 to 3.5m / s 2 , 0.3s is needed, so L2=3*0.3-0.5=0.4m. The distance of L1 depends on the deceleration stop speed of the elevator system end station, such as 0.8m / s, the normal deceleration of the elevator is 0.5m / s 2 , and the distance S required is 0.8 2 ÷(2*0.5)=0.64m, so L2=0.64-0.4=0.24m. Then the safety speed threshold value in the safety protection device is set to

[0025] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An elevator safety protection system, characterized in that: The system includes detection switches A1, A2, B1, and B2, and a safety protection device. Detection switches A1 and A2 are vertically spaced and positioned above and near the bottom landing sill on the inner wall of the elevator shaft. Detection switches B2 and B1 are vertically spaced and positioned below and near the top landing sill on the inner wall of the elevator shaft. The safety protection device is located in a machine room at the top of the elevator shaft. The power supply terminal of the safety protection device is connected to a power source. The signal input terminals of the safety protection device's MCU are connected to detection switches A1, A2, B1, and B2, respectively. The signal output terminal of the safety protection device's MCU is connected to the main elevator power supply located in the machine room.

2. The elevator safety protection system according to claim 1, characterized in that: The safety protection device is equipped with a threshold parameter V for detecting the speed. When the elevator is moving downwards, the elevator car moves to the a1 detection switch, and the safety protection device starts timing. When it reaches the a2 detection switch, the timing ends. The elevator speed V1 is calculated based on the distance between the a1 and a2 detection switches. When the speed V1 exceeds the threshold parameter V, the safety protection device outputs to disconnect the elevator's main power supply. When the elevator is moving upwards, the elevator car reaches the b1 detection switch, and the safety protection device starts timing. When it reaches the b2 detection switch, the timing ends. The elevator speed V2 is calculated based on the distance between the b1 and b2 detection switches. When the speed V2 exceeds the threshold parameter V, the safety protection device outputs a disconnection of the elevator's main power supply.

3. The elevator safety protection system according to claim 1, characterized in that: The elevator safety protection system also includes a buffer, which is located at the bottom of the elevator shaft.

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