WO2022100152A1

WO2022100152A1 - Quick braking method for dam accident door

Info

Publication number: WO2022100152A1
Application number: PCT/CN2021/109083
Authority: WO
Inventors: 施德航; 郑俊
Original assignee: 四川华能宝兴河水电有限责任公司
Priority date: 2020-11-11
Filing date: 2021-07-28
Publication date: 2022-05-19
Also published as: CN112411484A

Abstract

Disclosed is a quick braking method for a dam accident door. A generator is connected to a winch shaft of a winch of an accident door, an adjustable resistor is arranged on an excitation circuit of the generator, and a heat dissipation resistor is connected in a power generation circuit of the generator. The method mainly uses reverse torque generated by the generator to implement the braking of the accident door. At the same time, the magnitude of current in the excitation circuit is adjusted by means of adjusting an adjustable resistance value of the excitation circuit of the generator, so as to adjust the magnitude of the braking torque. In the present invention, when the accident door is lowered, same is cleverly used to drive a rotating shaft to rotate so as to make the generator generate power, and at the same time, the reverse torque generated by the generator is used to quickly brake the accident door, which prevents brake wear caused by traditional friction braking devices, and improves the convenience of quick braking of the accident door.

Description

A quick braking method for dam accident door

technical field

The invention relates to the technical field of dam accident emergency response, in particular to a quick braking method for a dam accident door.

Background technique

The dam accident door is an emergency disposal device installed on the dam to cut off the dam's flood outlet in an emergency. When the accident door is closed and throttled, it moves down through its own gravity to intercept the dam water flow. The accident door is generally more Heavy, in the process of lowering, a large braking force is required to brake the accident door. The existing braking method adopts the method of friction braking, which converts kinetic energy into heat energy through friction and dissipates it to the door. The purpose of braking is achieved in the air, and this braking method will cause serious wear and tear of the brake device, which needs to be replaced frequently, resulting in high maintenance costs. At the same time, when the braking force of the brake needs to be increased, more high braking torque, resulting in a large consumption of braking power consumption, which is not conducive to the requirements of energy saving and environmental protection. Therefore, it is necessary for those skilled in the art to design an emergency door braking method that can quickly realize the emergency door braking and at the same time reduce the wear of the braking device.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: to provide a method for quick braking of a dam accident door, to change the existing braking method of the accident door, to reduce the wear of the braking device, to improve the convenience of adjusting the braking force, and to reduce the maintenance frequency and frequency of the braking device. cost.

For achieving the above object, the technical scheme adopted in the present invention is as follows:

A quick braking method for a dam accident door, comprising the following steps:

S1: A generator is connected to one end of the winch shaft of the hoist of the dam accident door, and the rotor shaft of the generator is connected to the winch shaft, and an adjustable resistance and an AC-DC converter are set on the excitation circuit of the generator and connected to an external power supply At the same time, a heat dissipation resistance for consuming electric energy is set in the power generation circuit of the generator;

S2: When the dam accident door needs to be lowered, turn on the excitation switch of the generator. When the accident door starts to move downward, it drives the winch shaft to rotate, and the winch shaft drives the generator rotor shaft to rotate to generate electricity to generate electricity. The generator rotor shaft generates a reverse The torque is limited to limit the rotation of the winch shaft, so as to realize the rapid braking of the accident door; at the same time, the current generated by the generator is dissipated through the heat dissipation resistor for heat dissipation;

S3: When it is necessary to increase the reverse torque generated by the generator, thereby increasing the braking torque of the accident door, it can be realized by reducing the adjustable resistance value of the generator excitation circuit; Reverse torque, thereby reducing the braking torque of the accident door, and increasing the lowering speed of the accident door by increasing the adjustable resistance value of the generator excitation circuit.

Further, in the step S2, the action of turning on the excitation switch of the generator can be realized by setting a triggering device, and the triggering device is matched with the downward movement and the downward speed of the accident door.

Further, the triggering device is a mechanical triggering device or an electronic triggering device.

Further, the electronic trigger device is one of a displacement sensor or a speed sensor, or a combination of the displacement sensor and the speed sensor.

Further, the winch shaft is also provided with a friction auxiliary braking device.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention cleverly utilizes that when the accident door is lowered, the rotating shaft is driven to rotate so as to make the generator generate electricity, and at the same time, the reverse torque generated by the generator is used to realize the quick braking of the accident door, avoiding the traditional friction brake device. The resulting brake wear improves the convenience of quick braking of the accident door.

(2) The braking torque provided by the braking device of the present invention can be conveniently realized by the resistance value of the adjustable resistor, which improves the convenience of controlling the braking torque of the accident door.

(3) The power generation current generated by the generator of the present invention is dissipated into the air in the form of heat energy through the heat dissipation resistance, which does not cause environmental pollution, provides a clean equipment use environment, and effectively protects the ecological environment.

Description of drawings

FIG. 1 is a schematic structural diagram of the braking device of the present invention.

Among them, the names corresponding to the reference signs are:

1- accident door, 2- hoist, 3- capstan shaft, 4- generator, 5- adjustable resistance, 6- heat dissipation resistance, 7- excitation switch, 8- trigger device, 9- friction auxiliary braking device.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and examples, and the modes of the present invention include but are not limited to the following examples.

As shown in Figure 1:

A quick braking method for a dam accident door, which realizes the quick braking of an accident door through the directional torque generated by a generator, avoids brake wear caused by a traditional friction brake device, and improves the convenience of the accident door braking. Methods as below:

First, a generator 4 is connected to one end of the winch shaft 3 of the hoist 2 of the dam accident gate 1 , and when the generator 4 is connected, the rotor shaft of the generator 4 is connected to the winch shaft 3 . The excitation circuit of the generator 4 is provided with an adjustable resistor 5 and an AC-DC converter 10 and is connected to an external power supply. The AC-DC converter 10 converts the input AC power into DC power to realize the excitation of the generator. Through the different resistance values of the adjustable resistor 5 To realize the current in the excitation circuit, so as to realize the adjustment of the reverse torque of the generator, wherein, the adjustable resistance 5 can be realized by connecting the resistances of different resistance values in the adjustable resistance 5 through the contactor group, and by changing the contact Different contacts on the device group are used to realize the adjustment of the resistance value of the resistance in the excitation circuit. At the same time, a heat dissipation resistor 6 is provided in the power generation circuit of the generator 4, and the heat dissipation resistor 6 of the generator dissipates the electricity generated by the generator into the atmosphere through thermal energy loss.

When the emergency door of the dam needs to be lowered to intercept the current, the excitation switch 7 of the generator 4 is opened to generate current in the excitation circuit of the generator, so as to generate a magnetic field and realize the function of power generation. During the process, the capstan shaft 3 is driven to rotate, and the capstan shaft 3 drives the rotor shaft of the generator 4 to rotate to generate electricity to generate electricity. fast braking; the current generated by the generator 4 is dissipated through the heat dissipation resistor 6;

According to the principle of the generator, when the current in the excitation circuit increases, the magnetic field of the generator will also increase accordingly, so that the reverse torque generated by the generator will increase, and vice versa. When it is necessary to increase the reverse torque generated by the generator 4, thereby increasing the braking torque of the accident door 1, it can be realized by reducing the resistance value of the adjustable resistor 5 on the excitation circuit of the generator 4; The generated reverse torque reduces the braking torque of the accident door 1 and increases the lowering speed of the accident door 1 by increasing the resistance value of the adjustable resistor 5 on the excitation circuit of the generator 4 .

In order to realize the linkage between the accident door and the generator excitation switch and facilitate its automatic control, the linkage action of the excitation switch 7 can be realized by setting the trigger device 8, and the trigger device 8 can be a mechanical trigger device or an electronic trigger device, or both The combination of the mechanical trigger device can be set by the shrapnel. When the accident door is lowered and moved, the trigger shrapnel is pressed down to trigger the opening of the excitation switch; the electronic trigger device can be set by a displacement sensor or a speed sensor, or a combination of the two. To achieve this, install a displacement sensor or a speed sensor at the corresponding position of the accident door. When the accident door has a lowering displacement, the lowering speed will be generated. The displacement sensor receives the displacement movement or the speed sensor receives the speed change of the accident door and transmits a trigger signal. Feedback to the excitation switch to realize the opening of the excitation switch.

At the same time, in order to further ensure the safety of the accident door braking device, a set of friction auxiliary braking device is installed on the other side of the winch shaft 3. When the electric braking device fails to start effectively due to an accident, the friction auxiliary braking device can also be used. It is used as a backup brake device to ensure the safety of the accident door brake.

The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the protection scope of the present invention. If the technical problem is still consistent with the present invention, it should be included within the protection scope of the present invention.

Claims

A method for quick braking of a dam accident door, characterized in that it comprises the following steps:

S1: A generator (4) is connected to one end of the winch shaft (3) of the hoist (2) of the dam accident door (1), and the rotor shaft of the generator (4) is connected to the winch shaft (3), and the generator (4) is connected to the winch shaft (3). An adjustable resistor (5) and an AC/DC converter (10) are arranged on the excitation circuit of the generator (4) and connected to an external power supply, and a heat dissipation resistor (6) for consuming electrical energy is also arranged in the power generation circuit of the generator (4). );

S2: When the dam accident door (1) needs to be lowered, open the excitation switch (7) of the generator (4). When the accident door (1) starts to move downward, it drives the winch shaft (3) to rotate, and the winch shaft (3) The rotor shaft of the generator (4) is driven to rotate to generate electricity to generate power generation current, and the rotor shaft of the generator (4) generates a reverse torque, which restricts the rotation of the winch shaft (3), thereby realizing rapid braking of the accident door (1). The current generated by the machine (4) is dissipated through the heat dissipation resistor (6);

S3: When it is necessary to increase the reverse torque generated by the generator (4), thereby increasing the braking torque of the accident door (1), reduce the resistance value of the adjustable resistance (5) on the excitation circuit of the generator (4) to On the contrary, it is necessary to reduce the reverse torque generated by the generator (4), thereby reducing the braking torque of the accident door (1), and increasing the lowering speed of the accident door (1) by increasing the generator (4). ) on the excitation circuit adjustable resistance (5) resistance to achieve.
A method for quick braking of a dam accident door according to claim 1, characterized in that: in the step S2, the action of opening the excitation switch (7) of the generator (4) can be realized by setting a triggering device (8). , the triggering device matches the lowering movement and lowering speed of the accident door (1).
A quick braking method for a dam accident door according to claim 2, wherein the triggering device (8) is a mechanical triggering device or an electronic triggering device.
A quick braking device for a dam accident door according to claim 3, wherein the electronic triggering device is one of a displacement sensor or a speed sensor, or a combination of the displacement sensor and the speed sensor.
A quick braking method for a dam accident door according to claim 4, characterized in that: the winch shaft (3) is further provided with a friction auxiliary braking device (9).