JPH07215608A - Hydraulic elevator - Google Patents

Abstract

(57) [Summary] [Purpose] A hydraulic elevator that is safer and cheaper, and has a plunger brake device that does not cause the car to sink and ascend when loading or unloading passengers. [Structure] A brake device 31 for fixing the plunger 4 is arranged above the cylinder. The brake device 31 includes a brake brake lining 5, a drive motor 1, a reduction gear 2, nuts 8 and 9 for fixing the plunger 44.
A lever 6, a drive shaft 10, and an elastic body 7 such as a spring that releases the lining 5. The braking device 31 operates to release the braking force at all times when there is no braking operation command from the control device, at the time of power failure, at emergency stop, and only when the car is stopped and the door is open. , Fix the plunger 4.

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 rising of a car due to passengers getting on and off, for example, a technology described in Japanese Patent Publication No. 53-28699 is known. This prior art is to detect the floor level of a car, and supply or discharge pressure oil into a cylinder from a power unit provided in a machine room of an elevator to correct the floor level of the car.

As another conventional technique, for example, the technique described in Japanese Utility Model Laid-Open No. 58-16767 is known. This prior art is to prevent the sinking and ascending of the car by utilizing the jack pressure and fixing the plunger hydraulically.

[0004]

The above-mentioned conventional technique for correcting the floor level of the car by the pressure oil from the power unit provided in the machine room corrects the floor level of the car that has once sunk or floated. There is a problem that a shock is given to the car at the time of starting the car and the riding comfort is deteriorated. In addition, a dedicated unit for correcting the floor level of the car may be provided so as not to deteriorate the riding comfort, but such a conventional technique has a problem that the device becomes expensive. .

Further, the above-mentioned conventional technique for fixing the plunger by using the jack pressure has a problem that the jack pressure is low and the force for fixing the plunger is not sufficient, and the brake is released only when the braking force is not required. Since the brakes are fixed in the event of a power outage, emergency stop, etc., the shock of stopping the car will be large, which not only poses a danger to passengers but also traps passengers in the car. It has a problem that it becomes an obstacle for rescue.

Further, in any of the prior arts in which a dedicated unit for floor level correction is provided and the prior arts in which jack pressure is used, the installation space of the equipment is large and the arrangement of the equipment is not easy. Have a point.

An object of the present invention is to solve the above-mentioned problems of the prior art and to prevent a car from sinking and floating when passengers get on and off or load and unload cargo, and a safer and cheaper installation space is less. (EN) Provided is a hydraulic elevator equipped with a plunger brake device.

[0008]

According to the present invention, the above object is provided with a brake device for fixing a plunger by pressing a brake lining arranged on the circumference of the plunger surface against the plunger surface. When the power supply to the braking device is cut off, the braking force is released, and when there is a command from the control device,
For safety, it is achieved by configuring so that the braking force is released when the elevator is brought to an emergency stop, and by including an elastic body such as a spring mechanism that releases the braking force. It

Further, the above object is to provide a brake device, a pair of brake linings arranged on the circumference of the plunger surface, and a pair of levers arranged on the outer periphery of the brake lining, one end of which is coupled by a pin. And a means for restraining the lever arranged at the other end of the lever,
This is achieved by arranging this braking device above the cylinder.

[0010]

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 cargo, and to prevent a stop shock due to the brake device and to prevent a danger to 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, 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 elastic body allows the brake to be released automatically.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hydraulic elevator according to the present invention will be described in detail below with reference to the 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 front view illustrating the structure of another example of the power unit of FIG. 1, and FIG. 3 is a plunger brake device. FIG. 4 is a front view showing the upper part of the cylinder to which is attached, FIG. 4 is a flow chart for explaining the operation of the plunger brake, and FIG. 5 is a view for explaining the overall configuration of the hydraulic elevator according to one embodiment of the present invention. 1 to 3 and 5, 1 is an electric motor, 2 is a reduction gear, 3 is a lever fulcrum, 4 is a plunger, 5 is a brake lining,
6 is a lever, 7 is a return spring, 8 and 9 are nuts, 10 and 2
3 is a drive shaft, 21 is a return spring, 22 is a hydraulic brake jack, 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 a power source for the brake device. An electromagnetic switch for closing, 42 is a control device, 43 is an electric motor, 44 is a hydraulic pump, 45 is a control 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, a hydraulic elevator according to an embodiment of the present invention is connected to a cylinder 33 and a pulley 32 for winding a rope 35 around the tip of a plunger 4 driven by hydraulic pressure. It is configured by connecting a car 40 to a car 35. An electric motor 43, a hydraulic pump 44, and a control valve 45 are connected to the cylinder 33 via a pipe, and working oil is supplied to the inside of the cylinder 33 or the working oil inside is discharged. Cylinder 3
3 causes the plunger 3 to expand and contract, and the rope 3
Raise and lower the car 1 via 5.

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 1 at an arbitrary position is attached to the upper part of the cylinder 33. This braking device 31
As will be described later, the mechanically crimps and clamps the plunger 4, and holds the plunger 4 by squeezing a pair of arc-shaped brake linings to operate. This plunger brake device 31
The operation is controlled by the control device 42 through the electromagnetic switch 41 for turning on the power supply of the braking device.

The control device 42 controls the electric 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 electric 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 FIG. 1, the plunger brake device 31 is connected to a pair of arc-shaped brake linings 5 for clamping the plunger 4 by a lever fulcrum 3 and a pair of levers 6 for tightening the brake lining 5.
And nuts 8 provided on each end of the lever 6,
9, lever restraint means by the drive shaft 10 engaged with the nuts 8, 9, the electric motor 1 for rotationally driving the drive shaft 10 via the reduction gear 2, and the brake when the drive shaft 10 is stopped. It is composed of an elastic body such as a return spring 7 that eliminates the tightening force of the lining 5 on the plunger 4.

In the plunger brake device 31 having the above-described structure, the brake lining 5 has no brake operation command during traveling of an elevator, that is, when the driving of the drive shaft 10 by the electric motor 1 is stopped. It is separated from the plunger 4 by the return spring 7. Then, when an operation command is issued from the control device 42 shown in FIG. 5, the electric motor 1 operates and the power thereof is transmitted to the reduction gear 2 to the drive shaft 10, and the magnitude of the transmission force from the reduction gear 2 is returned to the return spring 7. When the magnitude of the spring force is exceeded, the drive shaft 10 starts to rotate.

The drive shaft 10 is threaded,
The pair of left and right levers 6 that generate a tightening force by the rotation of the drive shaft 10 include a nut 8 (right screw) and a nut 9 attached to the ends of the levers 6 so as to engage with the screw of the drive shaft 10.
(Left-hand thread). As a result, when the drive shaft 10 is rotationally driven, the lever 6 generates a tightening force with the lever fulcrum 3 as a fulcrum. This tightening force acts on the brake lining 5, and the brake lining 5 tightens and fixes 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 loading load of the elevator changes, and the elevator car 40 does not change. The floor position does not change.

The pitch of the screw of the drive shaft 10 and the screw of the nuts 8 and 9 that mesh with the drive shaft 10 are set such that when the drive of the electric motor 1 is stopped and the drive shaft 10 becomes free, the pulling force of the return spring 7 causes the tightening force of the lever 7. Is set so that it can be released.

The plunger brake device 31 described above is
Although it has been described that the electric motor 1 is used as its drive source, the brake device 31 can be configured using a hydraulic jack as its drive source.

Plunger brake device 31 in this case
As shown in FIG. 2, the brake hydraulic jack 22 is used as power instead of the electric motor 1 used as power in the embodiment described with reference to FIG.

In this case, when an operation command is issued from the control device 42 in the same manner as described above, a plunger for fixing and releasing the lever 6 is provided by a hydraulic power unit (not shown) provided separately from the main body of the brake device 31. The pressure oil is sent to the brake hydraulic jack 22 mounted parallel to the tightening direction of No. 4. The hydraulic jack 22 and the lever 6 are connected by a drive shaft 23, and a return spring 21 (compression spring) is attached between the pair of left and right levers 6.

Therefore, in the plunger brake device 31 shown in FIG. 2, when the force of the brake hydraulic jack 22 overcomes the spring force of the return spring 21, the lever 6 begins to move and the lever 6 is tightened as in the case described above. Fix the plunger 4. Then, when there is a brake release command from the control device 42 or when the power is cut off due to a power failure or the like, the brake force is released by the spring force as in the case described above.

The plunger brake device 31 constructed as described with reference to FIGS. 1 and 2 is, as shown in FIG.
The brake lining 5 is installed on the top of the cylinder 33 so as to clamp the plunger 4. By thus installing the brake device 31 on the top of the cylinder 33, it is possible to install the brake device efficiently in space.

Next, the operation of the plunger brake device 31 will be described as the control operation of the control device 42 assuming that the brake device has the configuration shown in FIG. 1 with reference to the flow shown in FIG.

(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. As a result, the electric motor 1 of the brake device 31 becomes free, the brake lining 5 and the lever 6 are pushed back by the return spring 7, 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 electric 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 or not, and whether the door is opened, the elevator is stopped, and the door is opened. If so, a brake command is issued, the electric motor 1 of the braking device 31 is driven,
The brake device 31 fixes the plunger 4 (steps 404 to 406).

(4) Similar to step 403, whether or not a power failure has occurred while the elevator is running or whether the safety device has operated is monitored, and when a 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 at a standstill. 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 in which a car is driven via a rope.
It can also be applied to a direct hydraulic elevator in which a car is directly mounted on the upper part of the plunger and 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 load and unload the luggage, and to reduce the stop shock due to the brake device, thereby making 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 elastic body allows the brake to be released automatically.

[0040]

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 the obstacle 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 front view illustrating a structure in which the power unit of FIG. 1 is used as another example.

FIG. 3 is a front view showing an upper portion of a plunger having a plunger brake device attached thereto.

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 electric motor 2 reduction gear 3 lever fulcrum 4 plunger 5 brake lining 6 lever 7 return spring 8, 9 nut 10 drive shaft 21 return spring 22 brake hydraulic jack 23 drive shaft 31 plunger brake device 32 pulley 33 cylinder 34 guide rail 35 ro -P 40 Car 41 Brake device Power-on electromagnetic switch 42 Control device 43 Electric motor 44 Hydraulic pump 45 Control valve 46 Tank 47 Pressure detector 48 Relief valve

Front Page Continuation (72) Inventor Eiichi Sasaki 1070 Ige, Katsuta-shi, Ibaraki Hitachi, Ltd. Mito Plant (72) Inventor Jun Kagawara 1070 Ige, Katsuta-shi, Ibaraki Hitachi Ltd. Mito Plant (72) Inventor Masayuki Hirose 1070, Moe, Katsuta, Ibaraki, Mito Plant, Hitachi, Ltd. (72) Inventor, Osamu Sawahata, 1070, Moe, Katsuta, Ibaraki, Mito, Hitachi, Ltd. (72) Inventor, Nakamura Hidewa 2 2-832, Horiguchi, Katsuta-shi, Ibaraki Hitachi System Plaza Katsuta, Hitachi Mito Engineering Co., Ltd. (72) Inventor Isao Yoshida 2-2, Horiguchi, Katsuta, 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 is planned. A braking device that presses against the jar surface to fix the plunger is provided, and the braking device releases the braking force when the power source for the braking device is cut off, and when there is a command from the control device, A hydraulic elevator characterized by releasing the braking force when the elevator is stopped in an emergency for safety reasons. 2. The hydraulic elevator according to claim 1, wherein the brake device includes an elastic body that releases a braking force. 3. The brake device is arranged on an upper portion of a cylinder, and a pair of brake linings are arranged on a circumference of a plunger surface, and a pair of brake linings are arranged on an outer periphery of the brake lining, one end of which is coupled by a pin. 3. A lever according to claim 1, and means for restraining the lever arranged at the other end of the lever.
Hydraulic elevator described. 4. The hydraulic elevator according to claim 2, wherein the elastic body is a spring mechanism and releases the brake lining via a lever.