JPH0570055A - Installing lift base for elevator - Google Patents

Abstract

PURPOSE:To provide the installing lift base of an elevator generating no inclination due to repeated lift actions of a lift body and stopped when the load difference is large. CONSTITUTION:A suspension body 7 fitted with winches 31, 32 at both ends of an upper edge section respectively and pivotally fitted with the center of a lower edge section to a lift body 1 and a control device stopping the lift body 1 when the difference between hoisting current values exceeds a preset value are provided. When the suspension length of one rope 2 becomes short, its side is lifted to incline the suspension body 7, the distance between the rope suspension point and the suspension center on the lift side becomes short, the load of the rope 2 on this side is increased, the hoisting speed of the winch becomes slow, and the suspension body 7 is returned horizontal. When the difference between the hoisting current values is increased, the lift body 1 is abnormally stopped. Safety is maintained, and high workability is provided. An accident caused by a large difference between loads applied to both ropes 2 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift for installing an elevator used in a scaffoldless construction method.

[0002]

2. Description of the Related Art FIG. 6 shows, for example, JP-A-60-21367.
FIG. 7 is a perspective view of a conventional elevator for an elevator installation shown in Japanese Patent No. 6; In the figure, 1 is a frame 11 and a workbench 12
And 2 are ropes suspended on both sides of the elevator 1, 31 is a first hoisting machine that winds one rope 2 provided on one side of the upper edge of the frame 11, 32 is the frame 11 A second hoisting machine provided on the other side of the upper edge to wind the other rope 2 4
Is a control panel for the first hoisting machine 31 and the second hoisting machine 32; 5 is an operation switch for the first hoisting machine 31 and the second hoisting machine 32; 6 is the first hoisting machine 31 and the second hoisting machine The power line of the machine 32.

A conventional elevator installation lift is constructed as described above, and when both the first hoisting machine 31 and the second hoisting machine 32 are energized at the same time, they both move at the same speed with the rope 2 Is taken up and rewound, and the elevating body 1 is moved up and down. Then, the worker on the workbench 12 installs the elevator.

[0004]

In the conventional elevator installation platform as described above, due to the difference in the load acting on the ropes 2 on both sides due to the repeated lifting operation of the elevator body 1, the operating speeds of the both are increased. Changes subtly, causing a difference in the hanging length of the rope 2. As a result, the workbench 12 is tilted into a dangerous state, and therefore the worker needs to stop the work and urge both of them to correct the tilt, which impairs safety and workability. was there.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain an elevator installation platform for an elevator which does not tilt due to repeated lifting operations of the elevator body and stops when an abnormality occurs. To do.

[0006]

SUMMARY OF THE INVENTION In an elevator installation lift according to the present invention, hoisting machines are attached to both ends of an upper edge portion, and the center of the lower edge portion is suspended from an elevator body. A holding body is provided.

Further, there is provided a control device which deactivates the hoist when the difference between the hoisting current values of the hoist exceeds a predetermined value.

[0008]

In the elevator installation lift constructed as described above, when the suspension length of one rope becomes shorter, the hoisting machine corresponding to that rope ascends and the suspension body tilts. Since the distance between the rope hoisting point on the hoisting side and the hanging core that is raised due to this inclination is shortened, the load of the rope increases and the hoisting speed of the corresponding hoisting machine slows down.

Further, when the difference between the hoisting current values of the hoisting machine exceeds a predetermined value, the lifting body stops.

[0010]

1 to 5 are views showing an embodiment of the present invention. In the drawings, the same reference numerals as those in FIG.
The hoisting body has a character shape. The first hoisting machine 31 and the second hoisting machine 32 are pivotally attached to both ends of the upper edge portion, and the center of the lower edge portion is the hanging core 71 on the frame 11 of the elevating body 1. It is pivotally attached by the pin that formed the. A current detector 8 is provided corresponding to two phases of the power lines of the first hoisting machine 31 and one phase of the power lines of the second hoisting machine 32. Second hoist 3
It operates when the difference between the two winding current values exceeds the predetermined value. 9 is a control device, 10 is an abnormality detection relay, E is its normally closed contact, L is the energizing relay contact of the first hoist 31, and R
Is an energizing relay contact of the second hoist 32, and (+) (-) is a power source.

In the elevator installation elevator having the above-described structure, the first hoisting machine 31 and the second hoisting machine 3 are used.
When the two hoisting speeds are the same, the two loads are equal and the suspension 7 is kept horizontal as shown in FIG. However, due to the difference in the load acting on the ropes 2 on both sides due to the repeated lifting and lowering operations of the lifting body 1, when the operating speeds of the two are slightly changed and the hanging length of the rope 2 becomes different, the lifting body 7 is Tilt as shown in FIG. Due to this inclination, the suspension point of the first hoisting machine 31, which is on the upper side, approaches the suspension core 71, which increases the load and slows the hoisting speed. Therefore, the suspension 7 automatically returns to the horizontal posture, so that the safety can be maintained and the workability is improved.

When the difference between the hoisting current values of the first hoisting machine 31 and the second hoisting machine 32 exceeds a predetermined value, the current detector 8 operates and the abnormality detection relay 10 is energized. Since the contact E is opened, the first hoisting machine 31 and the second hoisting machine 32 are de-energized, the lifting body 1 abnormally stops, and an accident occurs due to a large difference in load acting on the rope 2. Can be prevented.

[0013]

As described above, according to the present invention, hoisting machines are provided at both ends of the upper edge portion and the center of the lower edge portion is pivotally attached to the lifting body, and one rope is provided. When the suspension length of the rope becomes shorter, the hoisting machine corresponding to the rope ascends and the suspension body tilts. Since the distance between the rope hoisting point on the hoisting side and the hanging core that is raised due to this inclination is shortened, the load of the rope increases and the hoisting speed of the corresponding hoisting machine slows down. As a result, the suspension automatically returns to the horizontal posture, so that safety is maintained and high workability is obtained.

Further, by providing a control device for deactivating the hoisting machine when the difference between the hoisting current values of the hoisting machines on both sides exceeds a predetermined value, a large difference can be made in the load acting on the ropes on both sides. When this happens, the elevator is stopped abnormally, which has the effect of preventing accidents due to large load differences.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged front view of the suspension body portion of FIG.

FIG. 3 is a schematic diagram illustrating a normal load state in FIG.

FIG. 4 is a schematic diagram illustrating an abnormal load state in FIG.

5 is a conceptual electric circuit diagram of FIG.

FIG. 6 is a perspective view showing a conventional lift for installing an elevator.

[Explanation of symbols]

 1 Lifting body 2 Rope 7 Suspending body 8 Current detector 9 Control device 31 Hoisting machine 32 Hoisting machine

Claims (2)

[Claims] 1. A rope which is suspended and arranged on both sides of a lifting body, a winding machine which is arranged on the lifting body and winds the rope, respectively, and the winding machine is arranged at both ends of an upper edge portion. An elevating table for installation of an elevator, comprising: a suspension body having a lower edge portion centered on the elevating body. 2. The elevator according to claim 1, further comprising a controller for deactivating the hoisting machine via a current detector that operates when the difference between the hoisting current values of the hoisting machine exceeds a predetermined value. Lifting stand for installation.