JP2007137626A - Braking device for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a braking device for an elevator capable of reducing collision noise by adjusting a flow rate of pressurized fluid discharged from inside of a cylinder by a throttling device. <P>SOLUTION: This pressurized fluid-type braking device for braking rotation of a sheave 13 driving a car 11 and a balance weight 12 comprises a braking wheel 15, a braking mechanism part and a pressurized fluid unit. The braking mechanism part is provided with a spring 19 making a friction material 16a pressure contact with the braking wheel 15 to perform braking. The car 11 is lifted/lowered by flowing the pressurized fluid in the cylinder 17 of the braking mechanism part to operate a piston 18 and separating the friction material 16a from the braking wheel 15 by resisting the force of the spring 19 to release the braking. The car 11 is stopped by discharging the pressurized fluid from the cylinder 17 and moving the piston 18 in the opposite direction to perform braking by the force of the spring 19. The throttling device 30 is provided on a discharge pipe line of the pressurized fluid of the pressurized fluid unit. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a brake device for an elevator using a pressurized fluid brake.

2. Description of the Related Art Conventionally, elevator brake devices using a pressurized fluid brake are widely known (see, for example, Patent Document 1).
FIG. 3 shows the structure of an elevator brake device using a conventional pressurized fluid brake.
The elevator hoisting machine includes a sheave 13 that lifts and lowers an elevator car 11 and a counterweight 12 via suspension means 10 including a main rope and a belt, an electric motor 14 that drives the sheave 13, and rotation of the sheave. And a pressurized fluid brake device for braking the vehicle. The pressurized fluid brake device includes a brake wheel 15 serving as a braked body, a brake mechanism that brakes or releases the brake wheel 15, and a pressurized fluid unit that controls the pressurized fluid. The brake mechanism section brakes the brake pad 16 to which the friction material 16 a is attached, the cylinder 17, the piston 18 of the cylinder 17 to which the brake pad 16 is connected, and the brake pad 16 via the piston 18. A spring 19 is pressed against the vehicle 15 to be braked. The pressurized fluid unit is connected to a fluid tank 20, a fluid 21, a foreign matter removal filter 32, a pump 22 for pumping the fluid 21, a motor 23 for driving the pump 22, and a discharge side of the pump 22. A relief valve 24 provided at a position bypassing the pressure feed line 29c and the return line 29b returning to the tank 20, a check valve 25 provided in the pressure feed line 29c to prevent backflow of the pressurized fluid, A pressure accumulator 26 connected to a high-pressure feed line 29c, a pressure switch 27, an electromagnetic switching valve 28 connected to the pressure feeding line 29c, and a fluid chamber 17a of the electromagnetic switching valve 28 and the cylinder 17 of the brake mechanism section. And an inflow / discharge pipe 29a for connecting the two. In the electromagnetic switching valve 28, the inflow conduit 29a and the pressure feed conduit 29c are electrically connected by energizing the solenoid, and when the energization to the solenoid is stopped, the discharge conduit 29a and the return conduit 29b are electrically connected.
The elevator car 11 and the counterweight 12 are moved up and down by driving the electric motor 14 and rotating the sheave 13.
In the pressurized fluid unit, the pump 22 is stopped when the fluid pressure in the high-pressure pumping line 29c is equal to or higher than the upper limit set value PH of the pressure switch 27, and is driven when the fluid pressure is lower than the lower limit set value PL. The fluid pressure in the conduit 29c is controlled to be a predetermined high pressure. To release the braking of the brake device, when the solenoid of the electromagnetic switching valve 28 is energized and the inflow conduit 29a and the pressure feed conduit 29c are connected, the pressurized fluid flows into the fluid chamber 17a of the cylinder 17 and the force of the spring 19 is applied. The piston 18 is operated against this, the brake pad 16 is moved away from the brake wheel 15 to release the brake, and the car 11 is moved up and down.
On the other hand, when the energization of the electromagnetic switching valve 28 is stopped, the discharge pipe 29a is electrically connected to the return pipe 29b. The return line 29b communicates with the fluid tank 20 and is at atmospheric pressure, and the piston 18 is pressed by the force of the spring 19 to discharge the fluid in the fluid chamber 17a toward the fluid tank 20 while the brake pad 16 is braked. It moves until it presses to 15.

JP 2001-328772 A

  In a conventional elevator brake device, when the flow path resistance of the pipe line 29a, the pipe line 29b, and the electromagnetic switching valve 28 is sufficiently small with respect to the spring force, the piston moves faster when shifting to braking, and the brake pad 16 However, there is a problem that the noise that hits the brake wheel 15 increases. In addition, during emergency stop during elevator travel, there is a problem that the braking effect is too good and the shock immediately after braking becomes large.

  The present invention has been made in order to solve the above-described problems, and an elevator brake capable of reducing collision noise by adjusting the flow rate of pressurized fluid discharged from the cylinder with a throttle device. An object is to provide an apparatus.

  The elevator brake device according to the present invention includes a sheave that drives the elevator car and the counterweight to move up and down, an electric motor that drives the sheave, and a pressurized fluid brake device that brakes rotation of the sheave. The brake system includes a brake car, a brake mechanism that brakes or releases the brake car, and a pressurized fluid unit that controls the pressurized fluid. The brake mechanism presses the friction material against the brake car. The brake is released and the brake is released from the brake wheel against the force of the spring by injecting pressurized fluid into the cylinder of the brake mechanism and operating the piston. Is lifted and the pressurized fluid is discharged from the cylinder to move the piston in the opposite direction and brake it with the force of the spring. A brake device for an elevator which is adapted to sealed, in which a throttle device provided in the discharge conduit of pressurized fluid pressurized fluid unit.

According to this invention, by adjusting the flow rate of the pressurized fluid discharged from the cylinder with the throttle device, it is possible to adjust the piston speed that moves to the braking position, and the speed at which the friction material collides with the brake wheel. It is possible to reduce the collision noise.
In addition, since the time from when the friction material contacts the brake wheel to when it is completely pressed can be delayed, the braking force rises slowly, and the shock at the time of emergency stop can be reduced.

Embodiment 1.
1 is a block diagram showing the overall configuration of an elevator braking device according to Embodiment 1 of the present invention.

The elevator hoisting machine includes a sheave 13 that lifts and lowers an elevator car 11 and a counterweight 12 via suspension means 10 including a main rope and a belt, an electric motor 14 that drives the sheave 13, and rotation of the sheave. And a pressurized fluid brake device for braking the vehicle. The pressurized fluid brake device includes a brake wheel 15 serving as a braked body, a brake mechanism that brakes or releases the brake wheel 15, and a pressurized fluid unit that controls the pressurized fluid. The brake mechanism section brakes the brake pad 16 to which the friction material 16 a is attached, the cylinder 17, the piston 18 of the cylinder 17 to which the brake pad 16 is connected, and the brake pad 16 via the piston 18. A spring 19 is pressed against the vehicle 15 to be braked. The pressurized fluid unit is connected to a fluid tank 20, a fluid 21, a foreign matter removal filter 32, a pump 22 for pumping the fluid 21, a motor 23 for driving the pump 22, and a discharge side of the pump 22. A relief valve 24 provided at a position bypassing the pressure feed line 29c and the return line 29b returning to the tank 20, a check valve 25 provided in the pressure feed line 29c to prevent backflow of the pressurized fluid, A pressure accumulator 26 connected to a high-pressure feed line 29c, a pressure switch 27, an electromagnetic switching valve 28 connected to the pressure feeding line 29c, and a fluid chamber 17a of the electromagnetic switching valve 28 and the cylinder 17 of the brake mechanism section. An inflow / discharge pipe line 29a, a throttling device 30 including a flow rate adjusting valve having a substantially constant flow rate provided on the discharge pipe line of the inflow / discharge pipe line 29a, and an inflow / discharge pipe line 29a. And a check valve 31. provided in pipe path. In the electromagnetic switching valve 28, the inflow conduit 29a and the pressure feed conduit 29c are electrically connected by energizing the solenoid, and when the energization to the solenoid is stopped, the discharge conduit 29a and the return conduit 29b are electrically connected.
The elevator car 11 and the counterweight 12 are moved up and down by driving the electric motor 14 and rotating the sheave 13.
In the pressurized fluid unit, the pump 22 is stopped when the fluid pressure in the high-pressure pumping line 29c is equal to or higher than the upper limit set value PH of the pressure switch 27, and is driven when the fluid pressure is lower than the lower limit set value PL. The fluid pressure in the pipe line 29c is maintained within a predetermined pressure range. Here, when the solenoid of the electromagnetic switching valve 28 is energized, the pressure feed line 29 c and the inflow line 29 a are conducted, and the pressurized fluid flows into the fluid chamber 17 a of the cylinder 17 through the check valve 31, and the force of the spring 19 is applied. The piston 18 is operated against this, the brake pad 16 is separated from the brake wheel 15, the braking is released, and the car 11 is raised and lowered.
On the other hand, when the energization of the electromagnetic switching valve 28 is stopped, the discharge conduit 29a is connected to the return conduit 29b. The return line 29b communicates with the fluid tank 20 and is at atmospheric pressure. The piston 18 is pressed by the force of the spring 19 and moves until the brake pad 16 comes into pressure contact with the brake wheel 15 to be in a braking state. In the meantime, the fluid 21 in the fluid chamber 17a is pushed out to the piston 18 and is discharged to the fluid tank 20 side through the throttle device 30, the electromagnetic switching valve 28, and the return line 29b, which are flow rate adjusting valves having a substantially constant flow rate. . And when it transfers to a braking state, the pressurized fluid discharged | emitted by the piston 18 will become resistance because it passes the expansion | swelling apparatus 30, and it will become possible to make the moving speed of the piston 18 slow. That is, it is possible to adjust the speed of the piston 18 that moves to the braking position by adjusting the flow rate at which the pressurized fluid in the cylinder 17 is discharged by the throttle device 30, and the brake pad 16 is attached to the brake wheel 15. The collision speed can be reduced and the collision sound can be reduced. Further, since the time until the brake pad 16 comes into contact with the brake wheel 15 and completely presses can be delayed, the braking force rises gradually, and the shock at the emergency stop during the traveling of the elevator can be reduced.

Therefore, according to the elevator brake device according to the first embodiment, the piston speed moving to the braking position can be adjusted by adjusting the flow rate of the pressurized fluid discharged from the cylinder with the throttle device. The speed at which the friction material collides with the brake wheel can be reduced, and the collision sound can be reduced.
In addition, since the time from when the friction material contacts the brake wheel to when it is completely pressed can be delayed, the braking force rises slowly, and the shock at the time of emergency stop can be reduced.

Embodiment 2. FIG.
FIG. 2 is a block diagram showing an overall configuration of an elevator brake device according to Embodiment 2 of the present invention.

  In the first embodiment, the throttling device 30 including the check valve 31 and the flow rate adjusting valve is provided on the inflow / outlet conduit 29a. However, in the second embodiment, the throttling device 30 including the flow rate adjusting valve is provided. It is arranged on the return line 29b and does not require the check valve 31.

  Therefore, according to the second embodiment, the same effects as those of the first embodiment can be obtained, a check valve is not required, and the number of parts can be reduced.

1 is a block diagram illustrating an overall configuration of an elevator brake device according to Embodiment 1 of the present invention. FIG. It is a block diagram which shows the whole structure of the brake device of the elevator in Embodiment 2 of this invention. It is a block diagram which shows the whole structure of the brake device of the conventional elevator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Suspension means 11 Elevator car 12 Counterweight 13 Sheave 14 Electric motor 15 Brake wheel 16 Brake pad 16a Friction material 17 Cylinder 18 Piston 19 Spring 20 Fluid tank 21 Fluid 22 Pump 23 Motor 24 Relief valve 25 Check valve 26 Accumulator 27 Pressure Switch 28 Electromagnetic switching valve 29a Inflow / exhaust line 29b Return line 29c Pressure feed line 30 Throttle device 31 Check valve 32 Filter

Claims (3)

A sheave for raising and lowering an elevator car and a counterweight, an electric motor for driving the sheave, and a pressurized fluid brake device for braking rotation of the sheave,
The pressurized fluid brake device includes a brake vehicle, a brake mechanism that brakes or releases the brake vehicle, and a pressurized fluid unit that controls the pressurized fluid.
The brake mechanism unit includes a spring that presses and brakes the friction material against the brake wheel,
By injecting pressurized fluid into the cylinder of the brake mechanism and operating the piston, the friction material is separated from the brake wheel against the force of the spring to release the brake and raise and lower the car. In addition, in the elevator brake device, by discharging the pressurized fluid from the cylinder, the piston is moved in the opposite direction and braked by the force of the spring to stop the car.
An elevator brake device, characterized in that a throttle device is provided in a pressurized fluid discharge pipe of the pressurized fluid unit. A sheave for raising and lowering an elevator car and a counterweight, an electric motor for driving the sheave, and a pressurized fluid brake device for braking rotation of the sheave,
The pressurized fluid brake device includes a brake vehicle, a brake mechanism that brakes or releases the brake vehicle, and a pressurized fluid unit that controls the pressurized fluid.
The brake mechanism unit includes a spring that presses and brakes the friction material against the brake wheel,
By injecting pressurized fluid into the cylinder of the brake mechanism and operating the piston, the friction material is separated from the brake wheel against the force of the spring to release the brake and raise and lower the car. And, in the elevator brake device, by discharging the pressurized fluid from the cylinder, the piston is operated in the opposite direction and is braked by the force of the spring to stop the car.
A brake apparatus for an elevator, wherein a check valve is provided in a pressurized fluid inflow line of the pressurized fluid unit, and a throttle device is provided in a pressurized fluid discharge line.   3. The elevator brake device according to claim 1, wherein the throttle device is a flow rate adjusting valve having a constant flow rate.

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