CN107215744A - A kind of elevator permanent-magnetic is with the magnetorheological deceleration buffer device being combined - Google Patents

Abstract

The deceleration buffer device for elevators of the present application comprises a pair of repelling permanent magnets, conductors, pistons, air chambers, sensors, controllers, electromagnetic coils, iron yokes and magnetorheological fluids; the permanent magnets are respectively arranged at the bottom of the car and the piston At the top, when the elevator descends at overspeed, it can form up and down reverse permanent magnetic repulsion between the bottom of the car and the piston and magnetic braking force on the left and right sides of the bottom of the car to buffer and reduce the descending speed of the car; the piston is compressed by the magnetic repulsion The air chamber absorbs part of the energy of the car’s descent, and the air chamber automatically resets the piston after the descent process is over; the sensor detects the speed and weight of the car when it falls over speed; the electromagnet is energized after receiving the control signal from the controller, and the magnetorheological fluid generates The damping force further makes the car buffer and decelerate, thereby enhancing the safety of the elevator and reducing the personal injury to the passengers in the car when the elevator falls freely; the excitation current is adjustable, which can be applied to elevators with different operating speeds and heights, and has strong versatility .

Description

A deceleration buffer device combining permanent magnet and magnetorheological for elevator

technical field

The invention relates to a deceleration and buffering device for elevators which combines permanent magnets and magnetorheology, in particular to a deceleration and buffering device composed of multiple braking forces when an elevator car or a counterweight descends at overspeed.

Background technique

With the rapid development of modern high-rise buildings, elevators have become an indispensable means of vertical transportation in people's lives. With the number of elevators increasing year by year and the vertical lifting speed getting faster and faster, the incidence of accidents is also increasing. It directly affects the personal safety of passengers, so the elevator, as a special equipment, should have higher and higher requirements for its safety device.

The buffer is used as a safety device at the limit position, and its performance directly affects the personal safety of passengers. At present, the commonly used buffers include spring buffers, polyurethane buffers and hydraulic buffers; among them, spring buffers and polyurethane buffers are used as accumulators. The energy-type buffer mainly uses structural compression to form a reaction force, and converts the impact kinetic energy of the car into the internal energy of the buffer, and then plays a buffering role. However, rebound phenomenon occurs after buffering, which is only suitable for low-speed elevators. , the buffer stroke of the hydraulic buffer is short, and the existing buffers operate at the limit position of the car's falling process, and there is no effective slowing down for the car's falling process, causing the car to impact the buffer to stop at a relatively high speed, and its The impact force generated sometimes exceeds the tolerance range of the human body. At the same time, the structure of the hydraulic retarder is complex and prone to failure, resulting in a decrease in the retarding effect. It has poor adaptability to elevators with different operating speeds and heights.

Because someone thought of designing an elevator buffer protector, the application number is CN201510951215.6. This device uses the force of the magnetic field to slow down the falling speed of the car and even make the car suspend, so that the car will not touch the buffer or be in contact with it. The impact force is small, which can effectively protect the safety of the elevator occupants in the case of the elevator falling, but the elevator buffer protector only relies on the permanent magnet at the bottom of the car and the electromagnet in the pit to generate repulsion to cushion the car falling and protect The effect needs to be improved. Therefore, it is necessary to provide a new type of elevator deceleration buffer device, which can form a variety of braking forces to act together to achieve the deceleration buffer effect during the overspeed descending process of the elevator, thereby reducing the personal injury to passengers in the car. Through The adjustable electromagnetic field can enhance the damping force of the liquid to achieve the slowing effect.

Contents of the invention

In order to solve the above existing problems, the present invention provides a deceleration and buffering device combining permanent magnets and magnetorheology for elevators. A deceleration buffer device combining permanent magnet and magneto-rheological, which will minimize personal injury to passengers in the car; changing the strength of the electromagnetic field through an adjustable electromagnet can further change the damping force of the magneto-rheological fluid, thereby enhancing the deceleration effect, which is applicable It is used in elevators with different running speeds and heights. To achieve this purpose, the present invention provides a deceleration buffer device for elevators that combines permanent magnets and magnetorheology. The car is in the shaft, and the top of the car is connected to the cable, including Bracket, upper permanent magnet, lower permanent magnet, conductor, lower bracket, elastic support structure, piston, iron yoke, side plate, electromagnetic coil, epoxy layer, magnetorheological fluid placement groove, sensor and controller, the upper permanent The magnet is fixed below the car through the upper bracket, and the lower permanent magnet is fixedly installed on the top of the piston through the lower bracket. There is an elastic support structure under the upper part of the piston, an iron yoke is arranged under the elastic support structure, and there is an iron yoke in the air chamber. Magneto-rheological fluid placement tank, the magnetorheological fluid placement tank contains magnetorheological fluid, the lower part of the piston is wrapped by magnetorheological fluid in the magnetorheological fluid placement tank, and the magnetorheological fluid placement tank is two There is a side plate on each side, the outer side of the side plate has an epoxy layer, and the electromagnetic coil is inside the epoxy layer. The iron yoke and the magnetorheological fluid placement tank are installed on the bottom of the pit, and the inner wall of the well is attached Covered with a conductor, there is a sensor at the bottom of the car, and the controller is connected to the electromagnetic coil and the sensor through a connecting wire.

As a further improvement of the present invention, the elastic support structure is an air chamber or a mechanical spring piston during the descent process, and the air chamber absorbs part of the kinetic energy of the car to play a buffering role; when the car descends, the air chamber plays a reset role; The structure of the air chamber is square or circular, or composed of two independent air chambers; the air chamber can be replaced by a mechanical spring.

As a further improvement of the present invention, the upper permanent magnet and the lower permanent magnet are square or circular, and the permanent magnets of the present invention can be selected according to the actual car conditions.

The invention provides a deceleration and buffering device for an elevator that combines permanent magnets and magnetorheology, which can form permanent magnet repulsion, eddy current braking force, air chamber compression and magnetorheological fluid to generate more damping force during the overspeed descending process of the elevator These braking forces work together to achieve the deceleration and buffering effect. Among them, the electromagnetic field of the damping force generated by the magnetorheological fluid can be adjusted according to the weight and speed of the car, so as to meet the requirements of elevators with different heights on the buffering force. The device has a self-resetting function by utilizing the action of the air chamber, and can ensure that the piston is in a balanced position. Based on this device, it is beneficial to reduce personal injury to passengers in the car, and is suitable for deceleration and buffering of elevators of different heights and speeds, with good braking effect and strong versatility.

Description of drawings

Fig. 1 is the cross-sectional view of the structure of the deceleration buffer device combined with the permanent magnet and the magnetorheology of the elevator of the present invention;

Fig. 2 is a schematic diagram of the braking force provided when the deceleration buffer device combined with permanent magnet and magnetorheology of the present invention acts;

Graphical description:

1. Car; 2. Hoistway; 3. Upper bracket; 4. Upper permanent magnet; 5. Lower permanent magnet; 6. Conductor; 7. Lower bracket; 8. Air chamber; 9. Piston; 10. Iron yoke; 11 1. Side plate; 12. Electromagnetic coil; 13. Epoxy layer; 14. Magnetorheological fluid placement tank; 15. Bottom of pit; 16. Cable; 17. Sensor; 18. Controller.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

The present invention provides a deceleration buffer device combined with permanent magnet and magnetorheology for elevators. The device can form a variety of braking forces to act together to achieve the deceleration and buffer function during the overspeed descending process of the elevator, reducing the impact on passengers in the car. The deceleration buffer device combining permanent magnet and magnetorheological for personal injury; changing the electromagnetic field strength by adjusting the electromagnet can further change the damping force of the magnetorheological fluid, thereby enhancing the deceleration effect, which can be applied to different operating speeds and heights Elevator use.

The deceleration and buffering device of the present invention that combines permanent magnetism and magnetorheology as shown in Figure 1 is mainly composed of an upper permanent magnet 4 that generates a permanent magnetic repulsion field, a lower permanent magnet 5, a conductor 6 that generates an eddy current, and is used to detect the overspeed descent of the car. Sensor 17 for speed and weight, controller 18 for data processing and sending control instructions to electromagnetic coil 12, compressible air chamber 8 for absorbing part of the kinetic energy of the car, electromagnetic coil for generating damping force when piston 9 moves 12. Composed of iron yoke 10 and magnetorheological fluid. Wherein the upper permanent magnet 4 is fixed on the fixed bracket 3 made of non-magnetic material, and is fixed to the bottom of the car 1 through the bracket 3; the lower permanent magnet 5 is fixed on the fixed bracket 7 made of the non-magnetic material, and then fixed on the piston 9; The conductor 6 is fixed on both sides of the hoistway 2, and cuts the changing magnetic field to generate eddy current; the sensor 17 is used to detect the running speed of the car, and transmits the online monitoring data to the controller 18, and calculates the electromagnetic coil 12 according to the speed and weight of the car. Applied excitation current; the compressible air chamber 8 is located below the support 7 and can be made into a cylindrical or square air chamber to convert part of the motion of the piston 9 into air internal energy; the iron yoke 10 is fixed on the inner side of the shaft 2 and the bottom of the pit 15 Above; the magnetorheological fluid is installed in the sealed channel and placed inside the iron yoke 10; the electromagnetic coil 12 is placed in the iron yoke 10, and is poured with epoxy 13 and sealed and fixed by the side plate 11.

The working principle of the deceleration and buffering device combined with permanent magnet and magnetorheology of the present invention is as shown in Figure 2:

The upper permanent magnet 4 moves up and down with the car. When the car 1 descends at an overspeed, in addition to the safety device action of the elevator itself, when the car is about to reach the bottom pit, the upper permanent magnet 4 and the lower permanent magnet 5 generate permanent magnetic repulsion. , the permanent magnetic repulsive force field changes with the downward movement of the car and the movement of the piston, and the conductor 6 on the cutting shaft 2 generates an induced magnetic field to hinder the relative movement of the car, and consumes part of the kinetic energy in the form of heat energy, which has the effect of deceleration and buffering; Simultaneously, the downward movement of the piston causes the support 7 to move downward to compress the air in the air chamber 8 and consume part of the kinetic energy of the downward movement; the sensor 17 for detecting the overspeed descending speed and weight of the car and the controller 18 for data processing are based on the detected car. The compartment state applies an excitation current to the electromagnetic coil 12. When the electromagnetic coil 12 applies the opposite excitation current, a pair of reverse magnetic fields are formed, which increases the damping force of the magnetorheological fluid and plays a buffering effect. The generated electromagnetic field can be adjusted through the excitation current. , has achieved linear damping or other required damping effects. It can be seen that under the joint action of permanent magnetic repulsion, eddy current braking force, air chamber compression and damping force generated by magnetorheological fluid, the overspeed falling elevator can achieve deceleration buffer The effect is to reduce the personal injury of passengers; when the elevator stops, cutting off the excitation current can restore the magneto-rheological fluid to its original state, and the reset of the air chamber can restore the piston to its original position, preparing for the next deceleration buffer.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any other form, and any modification or equivalent change made according to the technical essence of the present invention still belongs to the scope of protection required by the present invention .

Claims (3)

1. a kind of elevator permanent-magnetic is with the magnetorheological deceleration buffer device being combined, car（1）In hoistway（2）It is interior, the car （1）Top connects hawser（16）, including upper bracket（3）, upper permanent magnet（4）, lower permanent magnet（5）, conductor（6）, lower carriage（7）, bullet Property supporting construction, piston（9）, iron yoke（10）, side plate（11）, magnet coil（12）, epoxy layer（13）, magnetic flow liquid standing groove （14）, sensor（17）And controller（18）, it is characterised in that：The upper permanent magnet（4）Pass through upper bracket（3）It is fixed on car （1）Lower section, the lower permanent magnet（5）Pass through lower carriage（7）It is fixedly mounted on piston（9）Top, the piston（9）Under top There is iron yoke below the flexible supporting construction in side, the elastic support structure（10）, the air chamber（8）Inside there is magnetic flow liquid standing groove （14）, the magnetic flow liquid standing groove（14）Inside there are magnetic flow liquid, the piston（9）Bottom is in magnetic flow liquid standing groove（14）It is interior Wrapped up by magnetic flow liquid, the magnetic flow liquid standing groove（14）Respectively there is a side plate both sides（11）, the side plate（11）Outside has Epoxy layer（13）, the epoxy layer（13）Inside there is magnet coil（12）, the iron yoke（10）With magnetic flow liquid standing groove（14）Peace Mounted in pit bottom（15）On, the hoistway（2）Inwall is covered with conductor（6）, the car（1）Sensor is arranged at bottom（17）, The controller（18）Magnet coil is connect by connecting line（12）And sensor（17）.

2. a kind of elevator permanent-magnetic according to claim 1 exists with the magnetorheological deceleration buffer device being combined, its feature In：The elastic support structure is air chamber（8）Or mechanical spring.

3. a kind of elevator permanent-magnetic according to claim 1 exists with the magnetorheological deceleration buffer device being combined, its feature In：The upper permanent magnet（4）With lower permanent magnet（5）For square or circle.