JPH08119559A - Hydraulic elevator - Google Patents

Abstract

PURPOSE: To provide an elevator provided with a plunger brake device which is safer, more inexpensive and small in the installation space where a car is prevented from being sunken or raised when passengers get on/off or the cargoes are loaded/unloaded. CONSTITUTION: A braking device to fix a plunger 4 to the upper part of a cylinder is arranged. The braking device is provided with a brake lining 5 to fix the plunger 4, a motor 1 for driving, levers 3, 3, plates 8, 10, and a return spring 12 which is an elastic body to release the lining 5, and the braking force is generated through an eccentric cam 7 and the plates to be driven by the motor 1. When there is no command to drive the brake from the control device, the braking device actuates to release the braking force constantly in the power failure and in the emergency stop, and fixes the plunger 4 only when the car is stopped and the door is open.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic elevator, and more particularly to a hydraulic elevator capable of preventing passengers from getting on and off or sinking and ascending of a car due to loading and unloading of luggage.

[0002]

2. Description of the Related Art As a conventional technology relating to a hydraulic elevator for preventing the subsidence and lifting of a car due to passengers getting on and off, for example, a technology described in Japanese Utility Model Laid-Open No. 61-160157 is known. This prior art has a pair of brake shoes that restrain the movement of the plunger, and the pair of brake shoes are driven by the operation of a solenoid to restrain the movement of the plunger.

As another conventional technique, for example, a technique described in Japanese Utility Model Laid-Open No. 62-173362 is known. This prior art is to restrain the plunger by using the hydraulic pressure of the pressure accumulator to drive the brake shoe that restrains the movement of the plunger.

Further, as another conventional technique, for example, the technique described in Japanese Utility Model Laid-Open No. 2-83869 is known. This conventional technique presses the sealing body by the force of the spring to restrain the movement of the plunger.

[0005]

In the above-mentioned prior art in which the drive portion for restraining the operation of the plunger is constituted by the solenoid, the restraint force becomes small and a sufficient braking force can be obtained when the solenoid is made small. It has a problem that it cannot be done. In addition, the above-mentioned conventional technique using the hydraulic pressure of the pressure accumulator has a problem that a hydraulic drive source must be provided separately from the main body, an installation space is required, and the device becomes expensive. Further, in the above-mentioned conventional technology in which the plunger operation is restrained by the spring force, the brake is controlled to be released when the braking force is unnecessary, so that the brake is fixed at the time of a power failure or an emergency stop. However, there is a problem that the shock of stopping the car becomes great, the passengers are not only dangerous, but the passengers are trapped in the car, and it becomes an obstacle when the passengers are rescued.

Each of the above-mentioned conventional techniques has a problem that the installation space of the equipment is large and the equipment is difficult to arrange.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a safer and cheaper installation space that does not cause subsidence and ascent of the car when passengers get on and off and loads are loaded and unloaded. An object of the present invention is to provide a hydraulic elevator having few plunger brake devices.

[0008]

According to the present invention, the above object is to provide a surface of a plunger of a hydraulic elevator in which a car is made to travel along a hoistway through a hydraulic jack which is composed of a cylinder and a plunger and is hydraulically operated. A brake device for fixing the plunger by pressing a brake lining arranged on the circumference onto the surface of the plunger is provided. The brake device includes a pair of levers, a plate connecting the levers to each other, and an eccentricity driven by a motor. This is achieved by driving the pair of levers in the direction of fixing the plunger through the eccentric cam and the plate by driving the motor.

Further, the object is to release the braking force when the power source for the brake device is cut off, and when there is a command from the control device or when the elevator is stopped for safety. It is achieved by releasing the braking force by the restoring force of the elastic body.

As a result, there is no fear of an increase in stop shock due to the brake device, the structure is simplified, and the initial purpose can be achieved.

[0011]

According to the present invention, by the above-mentioned means, the brake device uses the power to generate the braking force to fix the plunger 4 and open the plunger only when the car is stopped and the door is opened. At times, the restoring force of the elastic body is used to eliminate the braking force. Further, when there is no braking operation command from the control device, the braking force is controlled to be eliminated at all times.

Therefore, according to the present invention, it is possible to reliably prevent the sinking and ascending of the car when the passengers get on and off and load and unload luggage, and to prevent a stop shock due to the brake device and to prevent a danger to the passengers. can do. Further, even when the passenger is trapped in the elevator, it is possible to prevent the obstacle from interfering with the rescue work.

Further, according to the present invention, a power mechanism for releasing the brake can be dispensed with, the device can be made compact and have a simple structure, and when the power source is cut off,
The elastic body allows the brake to be released automatically.

Further, according to the present invention, the drive unit of the brake device can be integrally installed on one lever constituting the brake device, and the closing amount of the lever can be set by the eccentric amount of the eccentric cam. The braking device can be made compact and an appropriate braking force can be obtained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hydraulic elevator according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view for explaining the structure of a plunger brake device according to an embodiment of the present invention, FIG. 2 is a view showing the structure of a plunger brake drive portion, and FIG. 3 is a cylinder upper part to which the plunger brake device is attached. FIG. 4 is a front view, FIG. 4 is a flowchart for explaining the operation of the plunger brake, and FIG. 5 is a diagram for explaining the overall configuration of the hydraulic elevator according to the embodiment of the present invention. 1 to 3 and 5
, 1 is a motor, 2 is a lever support pin, 3 and 3 '
Is lever, 4 is plunger, 5 is brake lining,
7 is an eccentric cam, 8 and 10 are plates, 9 is an elastic body, 11
Is a pin, 12 is a return spring, 13 is a base, 14 is a support pin, 16 is a gland, 31 is a plunger brake device,
32 is a pulley, 33 is a cylinder, 34 is a guide rail, 35 is a rope, 40 is a car, 41 is an electromagnetic switch for turning on the brake device power supply, 42 is a control device, 43 is a motor, 44 is a hydraulic pump, and 45 is a control device. A valve, 46 is an oil tank, 47 is a pressure detector, and 48 is a relief valve.

First, the overall construction of a hydraulic elevator according to an embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 5, the hydraulic elevator according to one embodiment of the present invention is connected to a cylinder 33, and a pulley 32 around which a rope 35 is wound is connected to the tip of a plunger 4 driven by hydraulic pressure. It is configured by connecting the car 40 to the car. In the cylinder 33,
The motor 43, the hydraulic pump 44, and the control valve 45 are connected via a pipe, and hydraulic oil is supplied to the inside of the cylinder 33.
Alternatively, the hydraulic oil inside is discharged. Cylinder 33
This causes the plunger 4 to expand and contract, and the rope 35
Raise or lower the car 40 via.

A pressure detector 47 is attached to a pipe connected to the cylinder 33, and an output signal of the pressure detector 47 is transmitted to the control device 42. Further, a plunger brake device 31 capable of holding the plunger 4 interlocking with the car 40 at an arbitrary position is attached to the upper part of the cylinder 33. This braking device 31
As will be described later, is for mechanically crimping and sandwiching the plunger 4, and is for holding the plunger 4 by squeezing a pair of arc-shaped brake linings for operation. The plunger brake device 31 includes an electromagnetic switch 41 for turning on the brake device power supply, which is controlled by the control device 42.
Its operation is controlled via.

The control device 42 controls the motor 43 based on a command from an elevator control device (not shown), and controls the operation of the car 40 by letting hydraulic oil into and out of the cylinder 33 by the hydraulic pump 44.

The control device 42 includes an encoder ENC1 for detecting the speed of the car 40, an encoder ENC2 for detecting the rotational speed of the motor 43, and a pressure detector 47.
The detection signal from is being fed back. Further, a relief valve 48 is provided between the control valve 45 and the oil tank 46, and when the pressure of the hydraulic oil from the hydraulic pump 44 becomes abnormally high, the hydraulic oil is discharged to the oil tank 46 so that the elevator Improves safety.

As shown in FIGS. 1 and 2, the plunger brake device 31 is connected by a pair of arc-shaped brake linings 5 that pinch the plunger 4 and a lever support pin 2 fixed to a base 13 to form a brake. A pair of levers 3 and 3'for tightening the lining 5 are provided as main components. A plate 8 that can be moved horizontally by rotation of an eccentric cam 7 attached to the drive shaft of the motor 1 is attached to the lever 3 '. A plate 10 is attached to the other lever 3 via an elastic body 9, and the plate 10 and the plate 8 are connected by a pin 11.
Further, a return spring 12 is arranged between the levers 3 and 3 ′ so that a force acts in the direction of opening the lever.

In the plunger brake device 31 constructed as described above, the brake lining 5 is an elastic return spring 12 when there is no brake operation command such as during elevator travel, that is, when the motor 1 is stopped. Is separated from the plunger 4 by.
When an operation command is issued from the control device 42 shown in FIG. 5, the motor 1 operates to rotate the eccentric cam 7 in the A direction shown in FIG. The plate 8 is rotated by the rotation of the eccentric cam 7.
Are moved in the horizontal direction B, and power is transmitted to the plate 10. Further, since the elastic body 9 is provided, the power transmitted to the plate 10 acts so as to hold the levers 3 and 3'with the plunger 4 when the force exceeds a certain value, and the brake lining 5 Tightens the plunger 4 to fix the position of the plunger 4.

As described above, when the plunger 4 is fixed by the brake device 31, the position of the plunger 4 does not change even if the load of the elevator changes, and the elevator car 40 sinks and floats. Can be prevented.

The braking device 31 described above is used.
Can manage the force transmitted to the lever 3 based on the amount of deflection of the elastic body 9.

In the brake device 31, the motor 6 becomes free and the brake lining 5 and the levers 3 and 3'return springs when the power supplied to the motor 1 is cut off during elevator operation or due to a power failure or the like. It is pushed back by 12 and operates to open the plunger 4.

As shown in FIG. 3, the plunger brake device 31 described with reference to FIGS. 1 and 2 restrains the plunger 4 slidably inserted into the cylinder 33 on the top of the cylinder 33, and the operation thereof. To stop the gland 16 interposed between the cylinder 33 and the plunger 4,
A base 13 of the plunger brake device is fixedly attached by a support pin 14. By thus being installed on the top of the cylinder 33, the mounting structure can be simplified and the brake device can be installed space-efficiently.

Next, referring to the flow chart shown in FIG. 4, the operation of the plunger braking device 31 will be described with reference to FIG.
Assuming that the configuration shown in FIG. 2 is provided, the control operation of the control device 42 will be described.

(1) It is checked whether the elevator is running, and if it is running, a brake release command is issued to turn off the electromagnetic switch 41 for turning on the brake device power supply. As a result, the motor 1 of the brake device 31 becomes free, the brake lining 5 and the levers 3 and 3'are pushed back by the return spring 12, and the braking force is released (steps 401, 402).

(2) It is monitored whether a power failure has occurred while the elevator is running or whether the safety device has operated. When a power failure occurs or when the safety device has operated, step 40
As in the case of 2, the braking force is released. However, when a power failure occurs, the control device 42 stops the power supply to the motor 1 of the brake device 31 without performing any special control, so the brake device 31 automatically releases the braking force ( Steps 403, 408).

(3) If the power failure does not occur and the safety device does not operate in step 403, it is checked whether the elevator is stopped and whether the door is opened. If the elevator is stopped, the door is opened. When the brake command is issued, the motor 1 of the brake device 31 is driven,
The brake device 31 fixes the plunger 4 (steps 404 to 406).

(4) Similar to step 403, it is monitored whether a power failure has occurred while the elevator is running or whether the safety device has operated, and when the power failure occurs or when the safety device operates, the braking force is released. (Step 407,
408).

(5) After that, it is confirmed that the door is closed, the braking force is released, and the processing from step 401 is repeated (steps 409 and 410).

The above-described embodiment of the present invention prevents the subsidence of the car floor due to fluctuations in the load of the car while the elevator car is stopped. The fixing of the car and the like are performed by separately known means.

The above-described embodiment of the present invention has been described as being applied to an indirect hydraulic elevator that drives a car through a rope. However, the present invention is not limited to this.
It can also be applied to a direct hydraulic elevator in which a car is directly placed on the upper part of the plunger and is driven.

According to the above-described embodiment of the present invention, it is possible to reliably prevent the sinking and ascending of the car when the passengers get on and off and the cargo is loaded and unloaded. It can prevent a danger. Further, even when the passenger is trapped in the elevator, it is possible to prevent the obstacle from interfering with the rescue work.

Further, according to the present invention, the power mechanism for releasing the brake can be dispensed with, the device can be constructed in a compact and simple structure, and when the power source is cut off,
The brake can be released automatically by the return spring.

[0038]

As described above, according to the present invention, it is possible to reliably prevent the sinking and ascending of a car when passengers get on and off and when cargo is loaded and unloaded, and a stop shock at a sudden stop such as a power failure. It is possible to prevent the increase in the number of passengers and to eliminate obstacles for passenger rescue. Further, according to the present invention, the structure of the plunger brake device can be simplified, the number of parts and the manufacturing cost can be significantly reduced, and the plunger brake device can be installed in a space smaller than the conventional one. .

[Brief description of drawings]

FIG. 1 is a front view illustrating the structure of a plunger brake device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a structure of a plunger brake drive unit.

FIG. 3 is a front view showing an upper portion of a cylinder to which a plunger brake device is attached.

FIG. 4 is a flowchart for explaining the operation of the plunger brake.

FIG. 5 is a diagram illustrating the overall configuration of a hydraulic elevator according to an embodiment of the present invention.

[Explanation of symbols]

 1 Motor 2 Lever Support Pin 3, 3'Lever 4 Plunger 5 Brake Lining 7 Eccentric Cam 8, 10 Plate 9 Elastic Body 11 Pin 12 Return Spring 13 Base 14 Support Pin 16 Ground 31 Plunger Brake Device 32 Pulley 33 Cylinder 34 Guide Rail 35 Rope 40 Car basket 41 Brake device Power-on electromagnetic switch 42 Control device 43 Motor 44 Hydraulic pump 45 Control valve 46 Tank 47 Pressure detector 48 Relief valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiichi Sasaki 1070 Ichimo Ichi, Katsuta-shi, Ibaraki Hitachi Ltd. Mito Plant (72) Inventor Hidehiro Nakamura 1070 Ichige, Katsuta-shi, Ibaraki Hitachi Mito Co., Ltd. Inside the factory (72) Inventor Isao Yoshida 2 832 Horiguchi, Katsuta City, Ibaraki Hitachi System Plaza Katsuta Hitachi Mito Engineering Co., Ltd.

Claims (4)

[Claims] 1. In a hydraulic elevator in which a car travels along a hoistway via a hydraulic jack that is hydraulically operated and includes a cylinder and a plunger, a brake lining arranged on the circumference of the plunger surface has a plunger surface. A brake device for pressing the plunger to fix the plunger, the brake device comprising a pair of levers, a plate connecting the levers to each other, and an eccentric cam driven by a motor, and by driving the motor, A hydraulic elevator characterized in that the pair of levers are driven in a direction to fix a plunger through the eccentric cam and the plate. 2. The hydraulic elevator according to claim 1, wherein the brake device includes an elastic body that releases a braking force. 3. The braking device releases the braking force when the power source for the braking device is cut off, and when the control device issues a command, the elevator is stopped for safety reasons. The hydraulic elevator according to claim 1 or 2, wherein the braking force is released. 4. The hydraulic elevator according to claim 2, wherein the elastic body is a spring mechanism and releases the brake lining via a lever.