CN110002312A - One kind is based on pressure sensing anti-shearing elevator cage door system and shearing prevention method - Google Patents

Abstract

The invention relates to a shear-proof elevator car door system and shear prevention method based on pressure sensing, comprising: a control unit, an elevator motion monitoring unit, a pressure acquisition unit and an elevator stop signal output unit, the elevator motion monitoring unit Connected with the control unit, the pressure collection unit is respectively provided on the upper door frame and the lower door frame of the elevator car door, and the pressure collection unit is connected with the control unit, and the elevator stop signal output unit is connected with the The control unit is connected to receive the stop command issued by the control unit during squeezing and send the stop command to the safety circuit and the wire rope brake of the elevator, so that the safety circuit is cut off and the wire rope brake is actuated. The invention is universal, reasonable and safe, can be used in the delivery, new installation and regular installation of the elevator, and has great practical value.

Description

A shear-resistant elevator car door system and shear prevention method based on pressure sensing

technical field

The invention belongs to the technical field of elevator safety, and in particular relates to a shear-resistant elevator car door system based on pressure sensing and a shear prevention method.

Background technique

With the rapid development of the economy and the ever-changing cities, various high-rise buildings are increasing day by day. The elevators installed in high-rise buildings play an increasingly important role in people's lives and become an important means of transportation for people's daily travel. At the same time, as a kind of electromechanical special equipment, the safety of the use of the elevator is becoming more and more important. The accidental movement of the elevator car causes the elevator door frame to squeeze and shear the passengers, which is a very dangerous one. This kind of accident, once it occurs, the consequences are extremely disastrous, often resulting in casualties of passengers.

When the elevator door is opened, the movement of the car makes the elevator door frame squeeze and shear the passengers, which is an extremely dangerous state, causing accidents such as shearing and squeezing, which directly affects the safety of passengers. In fact, the problem of how to prevent shearing accidents has always been a thorny problem in the elevator industry, but the current situation is not optimistic. Design or mechanical protection often starts from the control system, but still fails to fundamentally solve the problem. At present, the implementation of this protection measure is rare in the industry. Most of them are to predict the upcoming accident and stop the elevator through the protection of the accidental movement of the elevator car. However, there are still cases where the brake cannot be effectively stopped when the brake fails. Case.

Therefore, how to use the device to monitor the running status of the car and detect whether it is sheared or squeezed, and how to use the relevant components to stop the car in time, is an important protection measure for the elevator.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the present invention proposes a shear-proof elevator car door system and a shear-prevention method based on pressure sensing, which is universal, reasonable and safe, and can be used in the delivery, new installation and regular installation of the elevator. It can be used and has great practical value.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

An anti-shear elevator car door system based on pressure sensing, comprising: a control unit, an elevator motion monitoring unit, a pressure acquisition unit, and an elevator stop signal output unit, wherein,

The elevator motion monitoring unit is connected with the control unit, and is used for monitoring whether the elevator is in a motion state and sending a trigger signal of the motion state to the control unit;

The pressure collection unit is respectively provided on the upper door frame and the lower door frame of the elevator car door, and the pressure collection unit is connected with the control unit for collecting the pressure values of the upper door frame and the lower door frame and sending them to the control unit. The unit judges whether there is extrusion;

The elevator stop signal output unit is connected with the control unit, and is used to receive the stop command issued by the control unit when squeezing and send the stop command to the safety circuit and wire rope brake of the elevator, so that the safety circuit is cut off. and actuate the wire rope brake.

Further, the control unit is arranged on the top of the car of the elevator, and the control unit includes: a controller, a wireless communication circuit, a charging and power supply circuit, and an A/D converter, wherein the wireless communication circuit is connected to the The charging and power supply circuit is connected to the rechargeable battery, and the input ends of the controller are respectively connected to the charging and power supply circuit and the A/D converter.

Further, the elevator motion monitoring unit includes: a photoelectric detection device and a wireless transmission device installed beside the elevator speed limiter, and the photoelectric detection device is connected to the wireless communication circuit through the wireless transmission device.

Further, the pressure acquisition unit includes: a strain gauge pressure sensor and a strain test bridge, two ends of the strain test bridge are respectively connected to the strain gauge pressure sensor and the A/D converter.

Further, the elevator braking signal output unit includes: a wireless receiving device and a signal outputting device, the input end of the wireless signal receiving device is connected with the wireless communication circuit, and the output end of the wireless signal receiving device is connected with the wireless communication circuit. The input end of the signal output device is connected, and the output end of the signal output device is respectively connected with the safety circuit of the elevator and the wire rope brake.

Further, there are three strain gauge pressure sensors.

In another aspect of the present invention, a method for detecting the extrusion situation at the elevator car door according to the aforementioned anti-shear elevator car door system is proposed, comprising the following steps:

(1) The elevator car moves unexpectedly when the door is open;

(2) The elevator motion monitoring unit monitors that the elevator is in a motion state, and sends a trigger signal of the motion state to the control unit to trigger it to be an effective state;

(3) The pressure collection unit collects the pressure values of the upper and lower door frames of the elevator car door and sends them to the control unit to judge whether there is a squeeze: when the pressure value reaches the preset squeeze threshold in the control unit, The control unit issues a stop command;

(4) The elevator stop signal output unit receives the stop command and sends the stop command to the safety circuit and wire rope brake of the elevator, cuts off the safety circuit of the elevator and makes the wire rope brake of the elevator act to stop the elevator.

The beneficial effects of the present invention include: the present invention effectively protects people's life and property safety by monitoring the running status of the car and detecting whether it is sheared or squeezed, and using relevant components to stop the car in time, effectively protecting people's lives and property, and has the advantages of universal, Reasonable and safe, it can be used in the factory, new installation and regular installation of elevators. It has great practical value, can promote the development of elevator business, and is of great significance to ensuring public safety and protecting people's lives and properties.

Description of drawings

FIG. 1 is a structural block diagram of the present invention.

FIG. 2 is a flow chart of the detection method of the present invention.

Fig. 3 is a schematic diagram of the passenger being squeezed when the elevator goes up.

Fig. 4 is a schematic diagram of the passenger being squeezed when the elevator goes down.

Among them, control unit 1, elevator motion monitoring unit 2, pressure acquisition unit 3, elevator stop signal output unit 4, passenger 5, car 6, upper door frame 7, lower door frame 8, strain gauge pressure sensor 9, upper hall door The door frame 10, the lower door frame 11 of the hall door.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to specific embodiments. The embodiments described below are exemplary, only for explaining the present invention, and should not be construed as limiting the present invention. If no specific technique or condition is indicated in the examples, the technique or condition described in the literature in the field or the product specification is used.

According to an embodiment of the present invention, FIG. 1 is a structural block diagram of the present invention. Referring to FIG. 1 , a pressure sensing-based anti-shear elevator car door system of the present invention mainly includes: a control unit, an elevator motion monitoring unit, pressure acquisition unit and elevator stop signal output unit.

According to an embodiment of the present invention, the control unit is arranged on the top of the car of the elevator. As shown in FIG. 1 , the control unit includes: a controller, a wireless communication circuit, a charging and power supply circuit (not shown in the figure) ) and an A/D converter, wherein the wireless communication circuit is connected to the controller, the charging and power supply circuit is connected to a rechargeable battery (not shown in the figure), and the input ends of the controller are respectively connected to the The charging and power supply circuit is connected with the A/D converter. According to some embodiments of the present invention, the controller described in the present invention is a common control system, which may include: a microprocessor system or a PLC control system, and the present invention is preferably a microprocessor system.

According to an embodiment of the present invention, as shown in FIG. 1 , the elevator motion monitoring unit includes: a photoelectric detection device and a wireless transmission device installed beside the elevator speed limiter, and the photoelectric detection device communicates with the wireless transmission device through the wireless transmission device. The wireless communication circuit is connected to monitor whether the elevator is in a moving state and send a trigger signal of the moving state to the controller, so that the controller is triggered to be an effective state, that is, a working state.

The photoelectric detection device of the invention detects the rotation of the elevator speed limiter. When the elevator car moves and the wheel of the speed limiter rotates, the photoelectric switch is triggered, and the signal is sent to the controller through the wireless transmitting device.

According to an embodiment of the present invention, the pressure acquisition unit is respectively provided on the upper door frame and the lower door frame of the elevator car door. As shown in FIG. 1 , the pressure acquisition unit includes: a strain gauge pressure sensor and a strain test bridge , the two ends of the strain test bridge are respectively connected with the strain gauge pressure sensor and the A/D converter. Figure 3 is a schematic diagram of the passenger being squeezed when the elevator goes up, and Figure 4 is a schematic diagram of the elevator going down. Schematic diagram of the passenger squeezing, as shown in Figures 3 and 4, the strain gauge pressure sensors are respectively installed on the upper door frame and the lower door frame, when the elevator goes up (in the direction shown in the figure), it detects the lower door frame of the car door. and the extrusion of the upper door frame of the hall door, collect the pressure value of the lower door frame, when the elevator goes down (the direction shown in the figure), detect the extrusion of the upper door frame of the car door and the lower door frame of the hall door, and collect the pressure value of the upper door frame, The collected pressure value is sent to the controller to judge whether there is a squeeze: when the pressure value reaches the preset squeeze threshold in the controller, the squeeze occurs, and the controller immediately issues a stop command.

According to some embodiments of the present invention, the specific quantity and steps of the strain gauge pressure sensors of the present invention are limited, and can be installed according to actual elevator requirements, and the present invention is installed as three.

According to an embodiment of the present invention, as shown in FIG. 1 , the elevator braking signal output unit includes: a wireless receiving device and a signal outputting device, the input end of the wireless signal receiving device is connected to the wireless communication circuit, the The output end of the wireless signal receiving device is connected with the input end of the signal output device, and the output end of the signal output device is respectively connected with the safety circuit of the elevator and the wire rope brake, and is used to receive the control signal issued by the controller during extrusion. The stop command is sent to the safety circuit and the wire rope brake of the elevator, so that the safety circuit is cut off and the wire rope brake is actuated, so as to prevent extrusion or shearing.

It can be understood that the safety circuit of the elevator of the present invention is arranged in the elevator control cabinet; the wire rope brake of the elevator of the present invention is arranged near the elevator host.

In another aspect of the present invention, a method for detecting the extrusion situation at the elevator car door according to the aforementioned anti-shear elevator car door system is proposed. FIG. 2 is a flowchart of the detection method of the present invention. Refer to As shown in Figure 2, it specifically includes the following steps:

(1) When the elevator is in the open state, when passengers enter or exit the car door or stand near the car door, the car moves unexpectedly, causing the passenger to be in a dangerous state of being caught and squeezed by the door frames of the car door and the hall door;

(2) The photoelectric detection device installed next to the elevator speed limiter detects the rotation of the wheel of the speed limiter, confirms that the elevator is in a moving state, and immediately sends a signal to the controller, so that the controller triggers the valid state;

(3) The strain gauge pressure sensor collects the pressure value of the lower door frame of the elevator car door and sends it to the controller to judge whether there is a squeeze: when the pressure value reaches the preset squeeze threshold in the controller, the controller Issue a stop command; more specifically, as shown in Figure 3, when the elevator is going up, the passenger is squeezed, and the strain gauge of the lower door frame of the car door reaches the preset squeeze threshold due to the squeeze, and the controller issues a stop command;

(4) The strain gauge pressure sensor collects the pressure value of the upper door frame of the elevator car door and sends it to the controller to judge whether there is a squeeze: when the pressure value reaches the preset squeeze threshold in the controller, the controller Send a stop command; more specifically, as shown in Figure 4, when the elevator goes down and the passengers are squeezed, the strain gauge on the door frame of the car door reaches the preset squeeze threshold due to the squeeze, and the controller sends a stop command ;

(5) The wireless receiving device receives the braking and stopping command, and sends the braking and stopping command to the safety circuit of the elevator and the wire rope brake through the signal output device, so as to disconnect the safety circuit of the elevator, and at the same time make the wire rope brake act to stop the elevator. .

To sum up, the present invention effectively protects people's life and property safety by monitoring the running condition of the car and detecting whether it is sheared or squeezed, and using relevant components to stop the car in time. Safety, which can be used in the factory, new installation and regular installation of elevators, has great practical value, can promote the development of elevators, and is of great significance to ensuring public safety and protecting people's lives and properties.

In the present invention, unless otherwise expressly specified and limited, terms such as "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integration; it may be a mechanical The connection can also be an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the description of this specification, description with reference to the terms "an embodiment," "some embodiments," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Changes, modifications, substitutions and modifications are made to the embodiments, and at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope.

Claims (7)

1. one kind is based on pressure sensing anti-shearing elevator cage door system characterized by comprising control unit, elevator motion Monitoring unit, pressure acquisition unit and elevator stopping signal output unit, wherein

Whether the elevator motion monitoring unit is connected with described control unit, be kept in motion and should for monitoring elevator The trigger signal of motion state is sent to control unit；

Be respectively equipped with the pressure acquisition unit on the upper door frame and lower door frame of elevator cage door, and the pressure acquisition unit with Described control unit be connected, for acquire the pressure value of upper door frame and lower door frame and send it to control unit carry out judgement be No appearance squeezes situation；

The elevator stopping signal output unit is connected with described control unit, the system that control unit issues when squeezing for receiving Stop instruction and the safety return circuit and steel wire braking that stop instruction is sent to elevator, cut off the safety return circuit and make The steel wire braking movement.

2. anti-shearing elevator cage door system according to claim 1, which is characterized in that described control unit is set to described The car top of elevator, described control unit include: controller, radio communication circuit, charging and power supply circuit and A/D conversion Device, wherein the radio communication circuit is connected with the controller, and the charging and power supply circuit are connect with rechargeable battery, institute The input terminal for stating controller is connected with the charging and power supply circuit and A/D converter respectively.

3. anti-shearing elevator cage door system according to claim 2, which is characterized in that the elevator motion monitoring unit packet It includes: the photoelectric detection system and wireless launcher being mounted on by elevator governor, and the photoelectric detection system passes through wirelessly Emitter is connected with the radio communication circuit.

4. anti-shearing elevator cage door system according to claim 2, which is characterized in that the pressure acquisition unit includes: Strain gauge pressure sensor and strain testing electric bridge, the both ends of the strain testing electric bridge respectively with the strain chip pressure Sensor is connected with the A/D converter.

5. anti-shearing elevator cage door system according to claim 2, which is characterized in that the elevator stopping signal output is single Member includes: radio receiver and signal output apparatus, input terminal and the wireless communication of the wireless signal receiving device Circuit is connected, and the output end of the wireless signal receiving device is connected with the input terminal of the signal output apparatus, the signal The output end of output device is connected with the safety return circuit of the elevator and steel wire braking respectively.

6. anti-shearing elevator cage door system according to claim 4, which is characterized in that the strain gauge pressure sensor It is three.

7. a kind of anti-shearing elevator cage door system according to any one of claims 1-5 is to the extruding feelings at elevator cage door The method that condition is detected, which comprises the following steps:

(1) carriage accidental movement occurs under the condition of opening for elevator；

(2) elevator motion monitoring unit monitoring elevator is kept in motion, and the trigger signal of the motion state is sent to control Unit processed triggers it as effective status；

(3) pressure acquisition unit acquisition elevator cage door upper door frame and lower door frame pressure value and send it to control unit into Row judges whether occur squeezing situation: when the pressure value reaches the default extruding threshold value in control unit, control unit is issued Stop instruction；

(4) elevator stopping signal output unit receives the stop instruction and stop instruction is sent to the safety return circuit of elevator And steel wire braking, it cuts off the safety return circuit of elevator and acts the steel wire braking of elevator, stop elevator.