JPH0532386A - Lift device - Google Patents

Abstract

PURPOSE:To prevent a carrier from abrupt vertical movement and improve safety when the carrier starts after the completion of an unloading operation. CONSTITUTION:A lift device is provided with a carrier 2 disposed vertically movably on the front face of a mast 1, a driving winch for vertically moving the carrier 2 through a wire 8, a clamp 15 mounted on the lower part of a load bed 2a of the carrier 2 to clamp the mast 1 and a load detector 16 provided between the load bed 2a and clamp 15. The load detector 16 detects the increment and decrement of the load when the carrier 2 is fixed to the mast 1 by the clamp 15 to wind or unwind the wire 8 by the driving winch to annul the increment and decrement of the load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift device applied to a lift for construction work, an elevator, etc. in the field of civil engineering and construction.

[0002]

2. Description of the Related Art As shown in FIG. 5, a lift device such as a construction lift or elevator is installed in a building 12 with a support member 1.
3, a mast 1 supported by 3, a carrier 2 that is vertically movable on the front of the mast 1, a lotus stand 3 for suspending and supporting the carrier 2, and a vertically movable mast 1. Counterweight 4, a counterweight lotus stand 5 for suspending and supporting the counterweight 4, a winch 7, etc.
The wire 8 is suspended from the carrier 2, the carrier lotus base 3 and the counterweight 4 through 0 and 11, and the wire 8 is driven by the drive winch 7.
The carrier 2 is raised or lowered by winding or sending.

By the way, when the carrier 2 is stopped at a predetermined position to load and unload a load, the change in the load of the carrier 2 causes the wire to expand and contract, causing the carrier 2 to move up and down to become unstable. A gripping device was attached to the mast 1, the mast 1 was gripped by the gripping device, the carrier 2 was fixed to the mast 1, and then the loading and unloading work was performed.

[0004]

However, in the above-mentioned conventional lift device, when the carrying device that has been lifted and lowered while being loaded is landed and the carrying device is fixed to the mast by the gripping device, the work is performed. When the gripping device is released for the purpose of raising and lowering the carrier, the wire contracts by the weight of the load and the carrier is suddenly pulled up.
There is a problem that it is dangerous and the durability of the wire is reduced. In addition, when the carrier that has been lifted and lowered in the empty state is landed and the carrier is fixed to the mast by the gripping device and the load is loaded, when the work is completed and the gripping device is released to raise and lower the carrier, it is loaded. There is a problem in that the wire stretches excessively by the weight of the load and the carrier sharply lowers, which may cause the load to collapse and is dangerous. In particular, in the case of a lift for a super high-rise, the wire is long, so the expansion and contraction of the wire increases correspondingly, and the risk increases.

The present invention is intended to solve the above-mentioned problems, and is a lift device capable of preventing a sudden rise and fall of a carrying device and improving safety when the loading and unloading work is completed and the carrying device is started. The purpose is to provide.

[0006]

To this end, the lift device of the present invention comprises a carrier 2 which is arranged on the front surface of a mast 1 so as to be vertically movable, a drive winch 7 for vertically moving the carrier 2 with a wire 8, and a carrier 2. A gripping device 15 attached to a lower portion of the cargo bed 2a for gripping the mast 1 and a load detector 16 provided between the cargo bed 2a and the gripping device 15 are provided. It is characterized in that the increase / decrease of the load when the 2 is fixed to the mast 1 is detected, and the wire 8 is wound or fed out by the drive winch 7 so as to eliminate the increase / decrease of the load. It should be noted that the numbers added to the above-mentioned configurations are for comparison with the drawings for easy understanding, and the configurations of the present invention are not limited by these.

[0007]

In the present invention, for example, as shown in FIG.
When the driving winch 7 is operated to stop the carrying device 2 at a predetermined position, the gripping device 15 is driven to fix the carrying device 2 to the mast 1 and when the load is loaded on the carrying device 2, the increased amount is increased. After the limit switch S1 detects and the drive winch 7 winds the wire 8 until the limit switch S1 is turned off, the drive winch 7 is stopped and the gripping device 15 is released. When lowered, the limit switch S2 detects the amount of decrease and the wire 8 is pressed until the limit switch S2 turns off.
After sending out, the driving winch 7 is stopped and the gripping device 15 is released. Therefore, when the driving winch 7 is started, the wire 8 does not expand and contract, and it is possible to smoothly move up and down.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a lift gripping device of the present invention. FIG. A is a front view and FIG. B is a side view.

The overall structure of the lift is similar to that shown in FIG.
On the front surface of the mast 1, a carrying device 2 is arranged so as to be able to move up and down, and a roller 9 is fixed to the upper part of the carrying device 2, and a wire 8 wound or sent out by a driving winch 7 is suspended on the roller 9. There is. Two gripping devices 15 are attached to the left and right of the lower part of the loading platform 2a of the carrier 2. The gripping device 15 is driven by a drive source such as hydraulic pressure, and the tip of the gripping device 15 grips the guide rail 1a of the mast 1 to fix the carrier 2 to the mast 1 and to extend and retract the wire 8 to carry the carrier 2. To prevent the vertical movement of the.
A load detector 16 is provided between the loading platform 2a and the gripping device 15, and it is possible to detect an increase / decrease in the load of the carrier 2 suspended by the wire 8 when the carrier 2 is fixed to the mast 1. Is configured as follows. In this embodiment, the load detectors 16 are provided at two places on the left and right, but any one place may be provided.

FIG. 2 is a partially enlarged sectional view of FIG. 1, in which arms 16 and 17 are fixed to the bed 2a and the gripping device 15, and the arms 16 and 17 are rotatably arranged via a pivot shaft 19. A load detector 16 is provided between the loading platform 2a and the gripping device 15 arm. The gripping device 15 is
It is composed of a grip portion 15a for gripping the mast 1 and a hydraulic cylinder 15b for operating the grip portion 15a.

FIG. 3 is a conceptual diagram showing an example of the load detector 16. A spring 16a is provided between the loading platform 2a and the gripping device 15, and an operating lever 16b is provided at an intermediate portion of the spring 16a. , Limit switches S1 and S2 arranged above and below the operating lever 16b. Figure A
Indicates a state where the loading platform 2a is fixed to the mast 1 by the gripping device 15, and the operating lever 16b is in a position where the upper and lower limit switches S1 and S2 are not operated. FIG. B shows a case where a load is loaded on the loading platform 2a, and the spring 16
a is contracted and the limit switch S is activated by the operating lever 16b.
1 is operated to detect the increased load.
Further, FIG. C shows a case where the load on the loading platform 2a is unloaded,
The spring 16a extends, and the limit switch S2 is operated by the operating lever 16b to detect the reduction of the load.

The operation of the present invention having the above structure will be described with reference to FIG. In step 21, the drive winch 7 is operated to stop the carry device 2 at a predetermined position, and in step 22, the gripping device 15 is driven to fix the carry device 2 to the mast 1. In this state, the carrier 2 is suspended by the wire 8, and the limit switches S1 and S2 are off, as shown in FIG. 2A. Next, in step 23, it is determined whether the limit switches S1 and S2 are on. When the limit switch S1 is on, that is, when a load is loaded on the carrier 2 as shown in FIG. 2B, when the gripping device 15 is released in this state, the wire 8 extends by the amount of the loaded load and the carrier 2 moves. It will fall rapidly. Therefore, in steps 24 and 25, the wire 8 is wound by the driving winch 7 until the limit switch S1 is turned off, and then the driving winch 7 is stopped in step 26. After that, when raising and lowering the carrier 2, step 2
When the gripping device 15 is released at 7 and the drive winch 7 is started at step 28, the wire 8 does not extend and smooth lifting and lowering is possible.

On the contrary, when the limit switch S2 is turned on in step 23, that is, as shown in FIG. 2C,
When the load is unloaded from the carrier 2, the gripping device 1 is in this state.
When the wire 5 is released, the wire 8 contracts by the amount of the unloading, and the carrier 2 rapidly rises. Therefore, step 2
In 9 and 30, after the wire 8 is fed by the driving winch 7 until the limit switch S2 is turned off, the driving winch 7 is stopped in step 26. afterwards,
When the carrier 2 is moved up and down, the gripping device 15 is released and the drive winch 7 is started.
It is possible to move up and down smoothly without shrinking.

In step 23, when the limit switches S1 and S2 are off, the process proceeds to step 27, and when the carry device 2 is moved up and down, the gripping device 15 is released.
The driving winch 7 is started.

[0015]

As is apparent from the above description, according to the present invention, a carrier which is arranged on the front surface of the mast so as to be movable up and down,
A drive winch that raises and lowers the carrier with a wire;
A gripping device, which is attached to a lower portion of the carrier of the carrier to enable the mast to be gripped, and a load detector provided between the carrier and the gripping device, the load detector includes a mast for the carrier by the gripping device. The increase / decrease of the load when it is fixed to the load is detected, and the wire is wound or sent out by the drive winch so as to eliminate the increase / decrease of the load. At this time, it is possible to prevent the carrier from being suddenly moved up and down and improve safety.

[Brief description of drawings]

FIG. 1 shows an embodiment of a gripping device for a lift according to the present invention,
Figure A is a front view and Figure B is a side view

2 is a partially enlarged sectional view of FIG.

FIG. 3 is a conceptual diagram showing an example of a load detector according to the present invention.

FIG. 4 is a flow chart for explaining the operation of the present invention.

FIG. 5 is a view for explaining a conventional lift, FIG. A is a front view, and FIG. B is a side view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mast, 2 ... Transporter, 2a ... Luggage platform, 7 ... Driving winch, 8 ... Wire 15 ... Grasping device, 16 ... Load detector

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tsutomu Kato 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Ryuichi Yanagida 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction (72) Inventor Koji Yoshida 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Yoshitada Koshihara 1-7-20 Hanazono Minami, Nishinari-ku, Osaka, Osaka Within Koshihara

Claims (1)

Claim: What is claimed is: 1. A carrying device which is vertically movable on a front surface of a mast, a drive winch for moving the carrying device up and down by a wire, and a mast attached to a lower portion of a carrier of the carrying device to grip the mast. A gripping device that enables the load, and a load detector provided between the loading platform and the gripping device, wherein the load detector detects an increase / decrease in the load when the carrier is fixed to the mast by the gripping device, A lifting device, wherein the wire is wound or sent out by the driving winch so as to eliminate the increase / decrease of the load.