Emergency braking device for elevator car

Abstract

The invention discloses an emergency braking device for an elevator car, and relates to the technical field of elevators. Comprising a brake and a hydraulic system, a mounting seat of the brake is fixed on a car frame, an elevator car is mounted on the car frame, the car frame moves up and down in a hoistway along an elevator guide rail, two brake calipers of the brake are located on the two sides of the elevator guide rail, and when the elevator runs in an overspeed mode or has the top and bottom rushing danger, the brake calipers of the brake can brake the elevator. And the hydraulic system controls the two brake calipers to extend out so as to clamp the elevator guide rail, so that the elevator car is stopped on the elevator guide rail. The braking devices are installed on the two sides of the car frame and act on the left row of elevator guide rails and the right row of elevator guide rails correspondingly, so that a firm protective barrier for guaranteeing safety of personnel and equipment is established, the braking devices act when overspeed occurs, the elevator car is stopped on the elevator guide rails before rushing to the top or squatting to the bottom, accidents are effectively prevented, and the safety of the elevator is improved. And the safety of elevator taking personnel and equipment is protected to the greatest extent.

Description

Technical Field

[0001] The invention relates to the technical field of elevators, and in particular to an elevator car emergency braking device. Background Art

[0003] For permanent magnet synchronous traction drive elevators, the brake is an important component that performs the functions of the car upward overspeed protection device and the car accidental movement protection device, and its braking performance directly affects the safe operation of the elevator. Although the elevator is also equipped with multiple safety protection measures such as speed limiter, safety clamp, upward overspeed protection device, car accidental movement protection device, buffer, etc., during the long-term use of the elevator, the car top or bottom collision accidents caused by brake core jamming, excessive wear of brake shoes, contactor failure, severe wear of traction sheaves, etc. often occur. When such accidents occur, the car often collides with the buffer or the top plate of the shaft to generate a large impact force, especially in the top collision accident. Since there are no buffer devices or other measures to protect the safety of the people in the car on the top of the car and the top of the shaft, it will cause more serious injuries to the people in the car. Summary of the invention

[0004] The main purpose of the present invention is to provide an elevator car emergency brake device to overcome the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] An elevator car emergency brake device comprises a brake and a hydraulic system, wherein the mounting seat of the brake is fixed on a car frame, the elevator car is mounted on the car frame, the car frame moves up and down in a hoistway along an elevator guide rail, and two brake calipers of the brake are located on both sides of the elevator guide rail. When the elevator is overspeeding or in danger of hitting the top or bottom, the hydraulic system controls the two brake calipers to extend so as to clamp the elevator guide rail, so that the car is stopped on the elevator guide rail.

[0007] Furthermore, the brake comprises a mounting seat, a brake caliper and a brake cylinder. The two brake cylinders are respectively mounted on two ends of the mounting seat, and the output ends of the piston rods of the brake cylinders are connected to the brake caliper.

[0008] Furthermore, the brake also includes a guide column and a return spring, the guide column is installed on the brake cylinder, the return spring is sleeved on the outside of the guide column, and one end of the guide column is connected to the brake caliper.

[0009] Furthermore, the hydraulic system includes a hydraulic pump station, an oil pump motor, an accumulator, a pressure relay and an electromagnetic reversing valve, wherein the hydraulic pump station is installed on the elevator car, one end of the oil pump motor is connected to the hydraulic pump station, and the other end is connected to the accumulator, the other end of the accumulator is connected to the brake cylinder, and the other end of the brake cylinder is connected to the oil tank of the hydraulic pump station;

[0010] Among them, the function of the oil pump motor is to pump hydraulic oil into the accumulator, the function of the accumulator is to maintain the working pressure of the system and provide power to the brake, the function of the electromagnetic reversing valve is to control the action of the brake, and the function of the pressure relay is to detect the pressure in the accumulator.

[0011] Furthermore, the electromagnetic reversing valve adopts a three-position four-way electromagnetic reversing valve.

[0012] Furthermore, the oil pump motor is connected to a relief valve, the accumulator is connected to a pressure gauge, and the brake cylinder is connected to a hydraulically controlled one-way valve.

[0013] Furthermore, a speed regulating valve is provided between the oil pump motor and the accumulator.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] By installing the braking device on both sides of the car frame, acting on the left and right rows of elevator guide rails respectively, a solid protective barrier is established to ensure the safety of personnel and equipment. When overspeed occurs, the braking device will be activated to stop the car on the elevator guide rail before it hits the top or bottom, effectively preventing accidents and protecting the safety of passengers and equipment to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the brake device of the present invention after installation.

[0017] Figure 2 It is a schematic diagram of the brake structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the hydraulic working principle of the present invention.

[0019] Among them, 1-hoistway, 2-elevator car, 3-brake, 31-mounting seat, 32-brake caliper, 33-brake cylinder, 34-guide column, 35-reset spring, 4-elevator guide rail, 5-hydraulic pump station, 51-oil pump motor, 52-accumulator, 53-pressure relay, 54-electromagnetic reversing valve, 6-car frame, 7-overflow valve, 8-pressure gauge, 9-hydraulic controlled check valve, 10-speed regulating valve. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0021] Combination Figures 1 to 3 The present embodiment provides an elevator car emergency brake device, including a brake 3 and a hydraulic system, wherein a mounting seat 31 of the brake 3 is fixed on a car frame 6, an elevator car 2 is mounted on the car frame 6, and the car frame 6 moves up and down in a shaft 1 along an elevator guide rail 4, and two brake calipers 32 of the brake 3 are located on both sides of the elevator guide rail 4. When the elevator is overspeeding or in danger of hitting the top or bottom, the hydraulic system controls the two brake calipers 32 to extend so as to clamp the elevator guide rail 4, so that the car is stopped on the elevator guide rail 4.

[0022] In this embodiment, the brake 3 includes a mounting seat 31 , a brake caliper 32 and a brake cylinder 33 . The two brake cylinders 33 are respectively mounted at two ends of the mounting seat 31 , and the output end of the piston rod of the brake cylinder 33 is connected to the brake caliper 32 .

[0023] In a further embodiment, the brake 3 also includes a guide column 34 and a return spring 35 , the guide column 34 is installed on the brake cylinder 33 , the return spring 35 is sleeved on the outside of the guide column 34 , and one end of the guide column 34 is connected to the brake caliper 32 .

[0024] In this embodiment, the hydraulic system includes a hydraulic pump station 5, an oil pump motor 51, an accumulator 52, a pressure relay 53 and an electromagnetic reversing valve 54. The hydraulic pump station 5 is installed on the elevator car 2. One end of the oil pump motor 51 is connected to the hydraulic pump station 5, and the other end is connected to the accumulator 52. The other end of the accumulator 52 is connected to the brake cylinder 33, and the other end of the brake cylinder 33 is connected to the oil tank of the hydraulic pump station 5.

[0025] Among them, the function of the oil pump motor 51 is to pump hydraulic oil into the accumulator 52, the function of the accumulator 52 is to maintain the working pressure of the system and provide power to the brake 3, the function of the electromagnetic reversing valve 54 is to control the action of the brake 3, and the function of the pressure relay 53 is to detect the pressure in the accumulator 52.

[0026] In a further embodiment, the electromagnetic reversing valve 54 adopts a three-position four-way electromagnetic reversing valve; the oil pump motor 51 is connected to a relief valve 7, the accumulator 52 is connected to a pressure gauge 8, and the brake cylinder 33 is connected to a hydraulically controlled one-way valve 9; a speed regulating valve 10 is provided between the oil pump motor 51 and the accumulator 52.

[0027] Specifically, the inlet and outlet of the brake cylinder must be connected to the hydraulically controlled one-way valve 9 to maintain pressure and prevent accidental release.

[0028] Working principle: Under normal circumstances, the three-position four-way electromagnetic reversing valve is in the middle position. At this time, if the pressure in the accumulator is lower than the set value, the pressure relay YL1 will be activated and the elevator safety circuit will be disconnected to stop the elevator. The oil pump motor will start and pump high-pressure oil into the accumulator; when the pressure in the accumulator rises to the set upper limit, the pressure relay YL2 will be activated, and the oil pump motor will stop working, the elevator safety circuit will be closed, and the elevator will resume normal operation. When the elevator is running at an overspeed or in danger of hitting the top or bottom, the electromagnetic reversing valve YV1 coil will be energized. At this time, the high-pressure oil in the accumulator will instantly enter the rodless chamber of the brake oil cylinder to push the piston rod out and make the elevator car stop on the elevator guide rail. At the same time, the oil in the rod chamber of the brake oil cylinder will return to the oil tank. When the car abnormal top fault is eliminated, the YV2 coil of the electromagnetic valve reversing valve will be energized, the brake piston rod will be retracted, and the car braking force will be released. With the emergency brake device of this embodiment, when overspeed occurs, the hydraulic brake device will be activated, so that the car can be fixed on the elevator guide rail before hitting the top or bottom, avoiding accidents.

[0029] Specifically, in this embodiment, the elevator car 2 is also provided with a car status monitoring and early warning device, which uses a controller to monitor the speed and position of the car to identify dangers. When the elevator runs at an overspeed or is in danger of hitting the top or bottom, the controller outputs a signal to energize the coil of the electromagnetic reversing valve YV1.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An elevator car emergency brake device, characterized in that: It includes a brake and a hydraulic system. The mounting seat of the brake is fixed on the car frame. The elevator car is installed on the car frame. The car frame moves up and down in the hoistway along the elevator guide rail. The two brake calipers of the brake are located on both sides of the elevator guide rail. When the elevator runs at an overspeed or is in danger of hitting the top or bottom, the hydraulic system controls the two brake calipers to extend to clamp the elevator guide rail, so that the car is stopped on the elevator guide rail.

2. An elevator car emergency brake device according to claim 1, characterized in that: The brake comprises a mounting seat, a brake caliper and a brake oil cylinder. The two brake oil cylinders are respectively mounted on the two ends of the mounting seat, and the output ends of the piston rods of the brake oil cylinders are connected to the brake caliper.

3. An elevator car emergency brake device as claimed in claim 2, characterized in that: The brake further comprises a guide post and a return spring, wherein the guide post is mounted on the brake oil cylinder, the return spring is sleeved on the outer side of the guide post, and one end of the guide post is connected to the brake caliper.

4. An elevator car emergency brake device as claimed in claim 2, characterized in that: The hydraulic system comprises a hydraulic pump station, an oil pump motor, an accumulator, a pressure relay and an electromagnetic reversing valve, wherein the hydraulic pump station is installed on the elevator car, one end of the oil pump motor is connected to the hydraulic pump station, and the other end is connected to the accumulator, the other end of the accumulator is connected to the brake cylinder, and the other end of the brake cylinder is connected to the oil tank of the hydraulic pump station; Among them, the function of the oil pump motor is to pump hydraulic oil into the accumulator, the function of the accumulator is to maintain the working pressure of the system and provide power to the brake, the function of the electromagnetic reversing valve is to control the action of the brake, and the function of the pressure relay is to detect the pressure in the accumulator.

5. An elevator car emergency brake device as claimed in claim 4, characterized in that: The electromagnetic reversing valve adopts a three-position four-way electromagnetic reversing valve.

6. An elevator car emergency brake device as claimed in claim 4, characterized in that: The oil pump motor is connected to a relief valve, the accumulator is connected to a pressure gauge, and the brake cylinder is connected to a hydraulically controlled one-way valve.

7. An elevator car emergency brake device according to claim 6, characterized in that: A speed regulating valve is arranged between the oil pump motor and the accumulator.

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