JPH10338434A - Hydraulic elevator - Google Patents

Abstract

(57) [Summary] [Problem] In a hydraulic elevator equipped with a counterweight and a rope for the counterweight, a solid weight between a counterweight and a rail for guiding the counterweight and cutting of the rope for the counterweight are provided. And other abnormalities are detected. A car (1) and a counterweight (5) are connected by a counterweight rope (6). A displacement sensor 26 for detecting the displacement of the thimble rod spring 22 is attached to a joint 20 between the counterweight rope 6 and the suspension frame 1a of the car 1. This is achieved by detecting an abnormality in the tension of the counterweight rope 6 from the output of the displacement sensor 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls the speed of a hydraulic cylinder by controlling the flow rate of working fluid supplied to or discharged from the hydraulic cylinder, and directly or indirectly controls the top of the hydraulic cylinder. The present invention relates to a hydraulic elevator equipped with a counterweight and a counterweight rope for controlling the speed of a supported car, and in particular, a firm connection with a counterweight and a rail for guiding the counterweight, and a counterweight. The present invention relates to a fluid pressure elevator capable of detecting an abnormality such as cutting of a weight rope.

[0002]

2. Description of the Related Art A method of compensating a driving force of a hydraulic elevator by a counterweight is disclosed in, for example, Japanese Patent Application Laid-Open No. 61-13688.
No. 9, disclosed in Japanese Patent Application Laid-Open No. 05-254758,
These documents do not disclose the detection of the firm weight between the counterweight and the rail that guides the counterweight or the breakage of the counterweight rope.

A device for detecting an abnormality of a rope is disclosed in, for example, Japanese Utility Model Publication No. 54-19639 and Japanese Patent Application Laid-Open No. 61-169474.
However, these devices detect a certain amount of looseness of the rope that supports the car and determine an abnormality such as a rope cut, such as when the balance weight is firm. It does not disclose the detection of rope hypertension occurring at the time.

[0004]

If the counterweight is tight with the rails that guide the counterweight, the car cannot be lowered. In addition, when the car rises, there is a risk that the counterweight rope may be loosened and may be wrapped around other equipment. Further, since the driving force compensation amount due to the counterweight is invalidated, there is a problem that the driving force for ascending is insufficient when the loading capacity of the car is large.

[0005] If the counterweight rope is cut, there is a danger that the cut counterweight rope may be wrapped around other equipment, and the driving force compensation due to the counterweight is invalid. Therefore, when the loading capacity of the car is large, there is a problem that the driving force for ascending is insufficient.

When there are a plurality of counterweight ropes, and when some of the counterweight ropes are cut, the driving force is compensated by the remaining counterweight ropes, but the cut counterweights are cut. Since the load share of the rope is added to the remaining counterweight rope, the safety factor is reduced and the operation is performed in a dangerous state. In addition, there is a risk that the cut counterweight rope may be wound around other equipment.

An object of the present invention is to provide a hydraulic elevator equipped with a device for detecting an abnormality of the above-described balancing rope or detecting a sign thereof.

[0008]

In order to solve the above-mentioned problems, the present invention controls the flow rate of a working fluid supplied to or discharged from a hydraulic cylinder, thereby controlling the speed of the hydraulic cylinder.
Controls the speed of the car supported directly or indirectly on the top of the hydraulic cylinder, and detects abnormalities in the tension of the counterweight rope in a hydraulic elevator equipped with a counterweight and a counterweight rope. It is provided with means for performing.

[0009]

1 and 2 show an embodiment of a hydraulic elevator according to the present invention. 1 and 2, a car 1 is supported by a main rope 3 so as to be able to ascend and descend into a hoistway, and a hydraulic cylinder 2 includes a main rope 3
The car 1 is indirectly driven up and down via the pulley 4 which engages with the car 1. That is, one end of the main rope 3 wound around the pulley 4 is fixed to the bottom of the car 1, and the other end is fixed to the ground via the pulley 4.

Therefore, by supplying the working fluid to the hydraulic cylinder 2 or discharging the working fluid therefrom and controlling the flow rate of the working fluid, the car 1 can be lifted and lowered. The balancing weight 5 for compensating a part of the weight of the car 1
The counterweight rope 6 is fixed to one end of the rope, and the other end is connected to the car 1 via a counterweight pulley 7. Therefore, the counterweight 5 acts in a direction to cancel the weight of the car 1 to reduce the load, and moves in the opposite direction to the car 1. The suspension frame 1a of the car 1 and the rope 6 for the counterweight are connected at the connecting portion 20.

As shown in detail in FIG. 2, the connecting portion 20 includes a thimble rod 21, a thimble rod spring 22, and a spring seat 2.
3, 24, and a nut 25. Displacement sensor 2
6 is attached between the suspension frame 1a of the car 1 and the spring seat 24, and detects the displacement of the thimble rod spring 22.

When the counterweight 5 is tightly moved by a rail (not shown) for guiding the counterweight 5 and cannot move, the counterweight 5 cannot be lifted.
It is impossible if the car 1 connected to it attempts to descend. Therefore, the tension of the counterweight rope 6 increases, and the thimble rod spring 22 contracts. By detecting the displacement of the thimble rod spring 22, the displacement sensor 26 detects an excessive tension, which is an abnormal rise in the tension of the counterweight rope 6.

Conversely, when the car 1 rises, the counterweight rope 6 is loosened, the tension is reduced, and the thimble rod spring 22 is extended. The displacement sensor 26 detects the displacement of the thimble rod spring 22 to detect the loosening of the counterweight rope 6.

When the car 1 cannot be lifted due to insufficient driving force, both the car 1 and the counterweight 5 do not move, so that the tension of the counterweight rope 6 does not indicate abnormality. In this case, the position of car 1 is detected,
An abnormality in the fluid pressure elevator can be detected by detecting that the cylinder pressure exceeds a predetermined value.

When the counterweight rope 6 is cut,
The tension decreases and the thimble rod spring 22 expands. The displacement sensor 26 detects the displacement of the thimble rod spring 22 to detect the loosening of the counterweight rope 6.

As described above, the provision of the device for detecting the displacement of the thimble rod spring 22 detects an abnormality in the tension of the counterweight rope 6, and the counterweight 5 and the counterweight along the hoistway. Abnormalities such as firm contact with the rail guiding the 5 and cutting of the counterweight rope 6 can be detected.

When a switch that is activated when a certain amount of displacement is reached is used as the displacement sensor, an abnormality in the tension is detected only when the tension of the counterweight rope exceeds a predetermined range. Such abnormalities are detected.

When a device capable of linearly detecting the displacement is used as the displacement sensor, the tension of the counterweight rope can be continuously detected, so that the above-mentioned sign of abnormality is also detected. be able to.

FIG. 3 shows an embodiment in which there are a plurality of balancing weight ropes.

Even if there are a plurality of counterweight ropes, by providing a device for detecting the displacement of the thimble rod spring of at least one counterweight rope,
Abnormality of the tension of the counterweight rope can be detected.

In FIG. 3, a displacement sensor 26 for detecting the displacement of the thimble rod spring 22 is attached to the joint 20 between the single counterweight rope 6 and the suspension frame 1a. No displacement sensor is attached to the joint 20 'between the other counterweight rope 6' and the suspension frame 1a.

When the counterweight 5 is firmly connected to a rail (not shown) for guiding the counterweight 5, an abnormality can be detected in the same manner as in the embodiment shown in FIG. That is, when the counterweight rope 6 to which the displacement sensor 26 is attached is cut, the tension of the cut counterweight rope 6 is reduced, and the thimble rod spring 22 is extended. The displacement sensor 26 is connected to the thimble rod spring 22.
Is detected, and the slack of the counterweight rope 6 is detected.

When another counterweight rope 6 'is cut, the tension of the uncut counterweight rope 6 increases, so that the thimble rod spring 22 contracts. The displacement sensor 26 detects the tension of the counterweight rope 6 by detecting the displacement of the thimble rod spring 22.

As described above, even when there are a plurality of counterweight ropes, the apparatus for detecting the displacement of the thimble rod spring of at least one counterweight rope can be provided. It is possible to detect abnormalities in tension and detect abnormalities such as tightness between the counterweight and the rail that guides the counterweight, and cutting of the counterweight rope.

FIG. 4 shows another embodiment of the present invention. In the embodiment of FIG. 1, one end of the main rope 3 and the counterweight rope 6 is directly fixed to the bottom of the car 1, but in FIG. 4, one end of the main rope 3 and the counterweight rope 6 is connected to the hoistway. The car 1 is supported and driven by a main rope 3 and a counterweight rope 6 via pulleys.

That is, the main rope 3 for driving and supporting the car 1 has one end fixed to the upper part of the hoistway and the pulley 2 provided at the upper part and the lower part of the pulley 2 provided at the bottom of the car 1. Fixed on the ground.

On the other hand, a balancing weight rope 6 for supporting the balancing weight 5 has one end fixed to the upper part of the hoistway and the other end connected to the balancing weight pulley 7 and the balancing weight 5 provided on the hoistway side. It is fixed to the upper part of the hoistway via the provided pulley. A displacement sensor 26 is provided at one end of the counterweight rope 6 that supports the counterweight 5. The displacement sensor 26 is the same as that described in FIG.

FIG. 5 shows another embodiment of the present invention.

The car 1 is supported in the hoistway by a main rope 3 so as to be able to move up and down, and the hydraulic cylinder 2 is indirectly connected to the car 1 via pulleys 41, 42, 43 engaged with the main rope 3. Is driven up and down. That is, the pulley 4
One end of the main rope 3 wound around 1, 42, 43
It is wound around a pulley provided at the bottom of the car 1,
Since the other end is fixed on the ground, when the fluid pressure cylinder 2 is driven, the car 1 moves up and down.

Therefore, by supplying the working fluid to the hydraulic cylinder 2 or discharging the working fluid therefrom and controlling the flow rate of the working fluid, the car 1 can be controlled to move up and down. The balancing weight 5 for compensating a part of the weight of the car 1
The counterweight rope 6 is fixed to one end of the rope, and the other end is connected to the car 1 via a counterweight pulley 7.

Therefore, the counterweight 5 acts in a direction to cancel the weight of the car 1 to reduce the load, and moves in the direction opposite to the car 1. The position of the car 1 is detected by the rotary encoder 31, and the position of the counterweight 5 is detected by the rotary encoder 32.

When the counterweight 5 is tightly connected to a rail (not shown) for guiding the counterweight 5, the counterweight 5 cannot be raised or lowered even if the car 1 attempts to ascend or descend. At this time, the rotary encoder 32 detects the position of the counterweight 5 and detects that the counterweight 5 is tight.

When the balance weight rope 6 is cut,
The counterweight 5 falls. Rotary encoder 32
Detects the position of the counterweight 5 and detects that the counterweight rope 6 has been cut.

When there are a plurality of counterweight ropes, and when some of the counterweight ropes are cut, the counterweight 5 is provided by the remaining counterweight ropes.
Does not fall, but the load of the cut balancing weight rope is added to the remaining balancing weight ropes, so that the tension of the remaining balancing weight ropes increases and the thimble rod spring contracts. For this reason, the relative position of the car 1 and the counterweight 5 is different from the normal position. The rotary encoder 31 and the rotary encoder 32 detect the positions of the car 1 and the counterweight 5 and detect an abnormality in the relative position, thereby detecting an abnormal tension in the rope for the counterweight.

As described above, by detecting both the position of the car and the position of the counterweight, the firm weight between the counterweight and the rail for guiding the counterweight and the cutting of the rope for the counterweight are detected. And the like can be detected.
Further, since the tension of the counterweight rope can be continuously detected from the relative positions of the rider and the counterweight, it is possible to detect a sign of the above-described abnormality.

FIG. 6 shows another embodiment of the present invention. In FIG. 6, when the abnormality detector 100 detects an abnormality in the tension of the counterweight rope by the above-described means of the present invention, an abnormality signal (not shown) output from the abnormality detector 100 is determined by the first determination. The degree of abnormality is determined by the detector 101a. When the determination level of the first determiner 101a is satisfied, the first operation mode 102a is selected. On the other hand, if the determination level of the first determiner 101a is not satisfied, the abnormality level of the abnormality signal is determined by the second determiner 101b. If the determination level of the second determination unit 101b is satisfied, the second operation mode 102b
Is selected. Hereinafter, the degree of abnormality is similarly determined, and the emergency operation mode according to the degree of abnormality is selected.
The selected emergency operation mode is, for example, degenerate operation, alarm issuance, operation suspension, and the like.

As described above, when the tension of the counterweight rope is detected to be equal to or greater than the predetermined tension, the operation mode of the fluid pressure elevator is selected in accordance with the detected degree of abnormality, thereby ensuring passenger safety.

[0038]

According to the present invention, an abnormality in tension of the counterweight rope is detected, thereby detecting an abnormality such as firmness between the counterweight and the rail that guides the counterweight and a break in the counterweight rope. be able to.

Further, by continuously detecting the tension of the counterweight rope, it is possible to detect a sign of the above-described abnormality.

When the tension of the counterweight rope is detected to be equal to or higher than the tension, the operation mode of the fluid pressure elevator is selected in accordance with the detected degree of abnormality, so that passenger safety can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a second embodiment of the present invention.

FIG. 2 is a diagram showing details of a coupling unit 20 shown in FIG. 1;

FIG. 3 is a diagram showing another example of details of the coupling unit 20 of FIG. 1;

FIG. 4 is a diagram showing another embodiment of the second aspect of the present invention.

FIG. 5 is a diagram showing a third embodiment of the present invention.

FIG. 6 is a diagram showing a fourth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Basket, 2 ... Fluid pressure cylinder, 3 ... Main rope, 4
... pulley, 5 ... counterweight, 6, 6 '... rope for counterweight, 7 ... pulley for counterweight, 20, 20' ...
Connection part, 21: thimble rod, 22: thimble rod spring, 23, 24: spring seat, 25: nut, 26: displacement sensor, 31, 32: rotary encoder, 100: abnormality detector, 101a, 101b, 101c: judgment Container, 1
02a, 102b, 102c ... operation mode.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Ichiro Nakamura 1070 Ma, Hitachinaka City, Ibaraki Prefecture Inside the Mito Plant, Hitachi, Ltd. (72) Inventor Haruo Watanabe 1070 Ma, Hitachinaka City, Ibaraki Prefecture Hitachi, Ltd. Inside Mito Plant (72) Inventor Eiichi Sasaki 1070 Ma, Hitachinaka City, Ibaraki Prefecture Inside Mito Plant, Hitachi, Ltd. (72) Inventor Akio Ueno 832 Horiguchi 8200 Horiguchi, Hitachinaka City, Ibaraki Prefecture Mitsui Mito Engineering Co., Ltd. (72) Inventor Katsuharu Shuto 1070 Ma, Hitachinaka-shi, Ibaraki Pref.Hitachi, Ltd., Mito Plant (72) Inventor Shigeto Kojima 2477 Takaba, Hitachinaka-shi, Ibaraki Pref., Hitachi Car Engineering Co., Ltd.

Claims (4)

[Claims] 1. A main rope supporting a car provided so as to be able to ascend and descend along a hoistway, a counterweight acting in a direction to cancel the weight of the car, and a counterweight rope supporting the counterweight. Comprising a hydraulic cylinder for raising and lowering the car, by controlling the flow rate of the working fluid to be supplied or discharged to the hydraulic cylinder, to control the speed of the hydraulic cylinder,
A hydraulic elevator which drives the main rope and controls the speed of a car which is directly or indirectly supported, the hydraulic elevator including means for detecting an abnormality in tension of the counterweight rope. 2. A hydraulic pressure elevator according to claim 1, further comprising a device for detecting a displacement of a thimble rod spring of said counterweight rope as means for detecting an abnormal tension of said counterweight rope. Fluid pressure elevator. 3. A main rope supporting a car provided so as to be able to ascend and descend along a hoistway, a counterweight acting in a direction for canceling the weight of the car, and a counterweight rope supporting the counterweight. A hydraulic cylinder for raising and lowering the car, controlling the flow rate of the working fluid to be supplied to or discharged from the hydraulic cylinder, thereby controlling the speed of the hydraulic cylinder to drive the main rope. In hydraulic elevators that control the speed of the car, supported directly or indirectly,
A fluid pressure elevator comprising a device for detecting both a position of a car and a position of a counterweight, and detecting an abnormality in tension of the rope for the counterweight from the relative positional relationship. 4. The hydraulic elevator according to claim 1, wherein when an abnormality in the tension of the counterweight rope is detected, the operation mode of the hydraulic elevator is changed to an emergency operation according to the degree of the abnormality detected. Fluid pressure elevator to switch to mode.