JP2006117427A - Dual suspension chain hoisting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chain hoisting device for preventing reduction in a limit value of a span, having a difference in the length of front-rear load chains of only a span of both load chains, and a reduced dead space without making a cargo interfere with a chain bucket, in lifting operation of the cargo, in a dual suspension chain hoisting device. <P>SOLUTION: In this dual suspension chain hoising device, a lower sheave 8 is wrapped around under a chain block 5, and the front-rear load chains 6a and 6b are respectively stretched on an extension part 4a of a body frame. In the chain hoising device, front-rear two sheaves 7a and 7b suspended from the body frame are respectively arranged, and the front-rear two load chains 6a and 6b delivered from the chain block 5 are wrapped around the lower sheave 8, and the load chains are tensioned by the sheave so that the rear load chain is wrapped around and suspended by the rear sheave 7a and the front load chain 6b is wrapped around and suspended by the front sheave 7b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a chain hoisting device using a chain block, and more particularly to a two-point hanging chain hoisting device that lifts and conveys a load at two locations.

2. Description of the Related Art Conventionally, a lifting device that horizontally lifts a load such as a roll at two front and rear positions using two load chains fed from a chain block is known. (For example, see Patent Document 1)
As shown in FIG. 4, the lifting device includes a traveling carriage 22 traveling on a traveling rail 21, traveling wheels 23, a chain block 24 including a load sheave (not shown) around which a load chain is wound, and a frame 25. A load chain hoisting device including a rear load chain 26a hanging from the chain block body 24, a front load chain 26b hanging from a sheave (not shown) provided in front of the frame 25, a drive motor 27, and a chain bucket 28. The load is moved up and down horizontally by the rear load chain 26a and the front load chain 26b. Reference numeral 29 denotes a hanging hook.
Japanese Patent Publication No. 7-17350 (4th page, Fig. 1)

  In the above-described conventional apparatus, the front load chain 26b is configured to hang directly from the chain block main body 24. Since the load interferes with the chain bucket 29 during the lifting / lowering operation of the load, there is a gap between the chain bucket 29 and the frame 25. It had the subject of becoming a dead space that was not used for lifting and lowering the load. Further, since the front load chain 26b is hung from the horizontal direction with respect to the load sheave, the meshing length of the front load chain 26b and the load sheave is as short as about 1/4 of the load sheave. It had the subject that sufficient winding tension was not provided. In order to solve this problem, there has also been proposed a hoisting device in which a guide sheave is provided below the load sheave and the front load chain is hung from the frame to the load sheave from below via the guide sheave below the chain block. However, in this device, in addition to the problem of the conventional device that the dead space is large, the distance between the front load chain and the rear load chain is smaller than that of the rear load chain hanging from the chain block body ( (Span) length and the extension loss due to the slanted part from the upper frame to the guide sheave provided below the chain block, and when the load is lifted, the difference in elongation between the front load chain and the rear load chain increases. , Had the problem of increasing the inclination of the load.

  In order to solve the above-mentioned problems, the present invention provides a main body frame of a hoisting device having an extension on the front side, a chain block provided on the main body frame and provided with two load sheaves, and extended from the chain block. In a two-point suspension chain hoisting device with two front and rear load chains, the lower sheave is hung below the chain block, and the two front and rear load chains are hung on the extension of the main body frame. The front and rear two upper sheaves are provided respectively, and the front and rear two load chains fed from the chain block are hung on the lower sheave, respectively, and then the rear load chain is hung on the upper rear sheave and suspended. The load chain is stretched over the sheave so that the front load chain hangs on the upper front sheave. That.

  In addition, a guide sheave is provided at the center of the upper front sheave and the upper rear sheave, and the rear load chain is hung on the upper rear sheave via the guide sheave.

  Furthermore, an elastic covering body covering the load chain is provided between the upper front sheave and the upper rear sheave and the lower ends of the two front and rear load chains, and a linear guide body is provided between the elastic covering body and the load chain, The linear guide body is wound in conjunction with the lifting and lowering operation of the load chain.

  In the present invention, of the two front and rear load chains fed out from the chain block, the rear load chain is not hung directly from the chain block as in the conventional device, but is hung on the lower sheave provided below the chain block. After suspending, it is hung on the rear sheave provided on the upper frame and suspended, and there is a space between the rear load chain and the chain block and chain bucket, so it is raised and lowered by the load chain Since the load can be raised to the vicinity of the upper frame without interfering with the chain block and the hacket, the dead space for raising and lowering the load can be greatly reduced as compared with the conventional apparatus.

  In addition, the two front and rear load chains are hung on the lower sheave provided below the chain block on the load side, so that they are sufficiently wound and hung on the load sheave. As in the upper device, it is possible to provide a hoisting device that does not hinder the winding tension and has sufficient winding tension.

  In addition, as described above, a guide sheave is provided below the load sheave and the front load chain is hooked from the upper frame to the load sheave via the guide sheave in order to solve the lack of winding tension caused by the hoisting device described in the conventional example. A hoisting device adapted to be mounted has also been proposed, but in this device, in addition to the problem that the dead space is large, the front load chain is compared with the rear load chain hanging from the chain block body. When the load is lifted by the distance between the upper and rear load chains (span) and the length from the upper frame to the guide sheave provided below the chain block, the difference in elongation between the front load chain and the rear load chain However, in the present invention, the front, rear The load chain is wound in parallel with the chain sheave from the chain block to the lower sheave and stretched over the rear sheave on the upper frame. The difference in length with the load chain is only the span length, the difference in elongation between the front load chain and the rear load chain is reduced, and the load inclination is reduced, so adjustment work to keep the load inclination horizontal. Is reduced.

  The front load chain and the rear load chain are stretched in parallel, and only the rear load chain is folded back from the center between the two chains. This eliminates the difference, which eliminates the inclination of the load, eliminates the need for an adjustment mechanism for keeping the load horizontal, and eliminates the need for adjustment work.

  The upper front sheave, the upper rear sheave, and the lower end of the load chain are provided with a stretchable covering body that covers the load chain, and a linear guide body is provided between the stretchable covering body and the load chain. As the hoisting device is wound in conjunction with the lifting and lowering operation of the load chain, it is possible to prevent scattering of dust generated when the hoisting device is driven, and to provide a hoisting device suitable for a clean room. The lower part is attached to the lower frame between the load chain and the elastic cover, and there are multiple guide bodies that move up and down in conjunction with the movement of the load chain. At this time, even if it comes into contact with the guide body, it does not come into contact with the load chain, so that it is possible to prevent damage to the expansion / contraction covering body when the load chain is lifted or lowered.

Hereinafter, Example 1 and Example 2 of the present invention will be described.
(Embodiment 1)
A first embodiment of the present invention will be described with reference to FIGS.

  1 is a front view showing a chain hoisting apparatus according to a first embodiment of the present invention, and FIG. 2 is a side view thereof.

In the figure, 1 is a traveling rail horizontally installed on the ceiling or the like, 2 is a pair of guide wheels 3 a that roll along the both sides of the traveling rail with the traveling rail 1 interposed therebetween, and a pair of traveling wheels 3 that travel on the traveling rail 1. 4 is a main body frame of the hoisting device, and is provided with an upper frame 4a extending forward at the upper portion, and a rear sheave 7a and a front sheave 7b are provided above the main body frame 4 on the upper frame 4a. The traveling carriage 2 is provided with a chain block 5 below the main body frame 4, and the upper frame 4 a extends along the traveling rail 1 and is provided integrally with the main body frame 4. Reference numeral 4b denotes a chain cover provided on the upper frame 4a for closing the lower side of the load chains 6a and 6b extending between the rear sheave 7a and the lower sheave 8. A chain block 5 on which the main body frame 4 is installed is a known electric chain provided with a pair of load sheaves (not shown) for winding up and down two chains 6a and 6b for lifting and lowering a load. It is a block. The pair of load sheaves are driven by the same motor 9 and are configured to move the two front and rear load chains up and down in synchronization. 6a and 6b are front and rear load chains wound up and down by the chain block 5. The rear chain 6a is connected to a lower sheave 8 provided below the chain block 5 from a load sheave (not shown). The front load chain 6b is suspended from the upper sheave 7a provided on the upper frame 4a, and the front load chain 6b is provided from the load sheave (not shown) to the lower sheave 8 and the upper frame 4a in the same manner as the rear load chain 6a. After being hung on the rear sheave 7a, it is hung on the upper front sheave 7b provided in front of the upper rear sheave 7a, suspended downward from the upper front sheave 7b, and between the load sheave and the rear sheave 7a. The two front and rear load chains 6a and 6b are stretched in parallel. .
As described above, the upper rear sheave 7a and the front sheave 7b are sheaves that guide when the front and rear load chains 6a and 6b are wound up and down, and the front and rear load chains 6a and 6b fed out from the load sheave are chain blocks. 5, the rear load chain 6a is hung on the rear sheave 7a, the front load chain 6a is guided by the rear sheave 7a, and the upper front sheave 7b. The upper front sheave 7b is installed in front of the upper frame 4a, and the front load chain 6b is hung thereon. Reference numeral 8 denotes a lower sheave provided below the main body frame 4 so that a load chain fed from the chain block 5 is suspended under the chain block 5, 9 a motor for driving a load sheave, and 10 a traveling wheel. A traveling motor 11 is a bucket in which a no-load side chain fed from the chain block 5 is accommodated. Reference numeral 12a denotes a hanging bracket that is attached to the lower ends of the load chains 6a and 6b and attaches a load, and is screwed to a screw portion 12b provided at the lower ends of the load chains 6a and 6b so that the position can be adjusted vertically. This hanging bracket 12a can adjust the difference in elongation of the load chains 6a and 6b by rotating the hanging bracket 12a and adjusting the position of the hanging bracket 12a up and down. Can be prevented. Reference numeral 13 denotes an operation box for controlling the traveling control of the traveling carriage 2 and the lifting / lowering operation of the chain block 5, and 14 is an operation unit. 15 is provided between the bracket 16 attached to the lower part of the upper frame 4a and the suspension fitting 12a, and is an elastic covering body that expands and contracts in a bellows manner in conjunction with the lifting and lowering operation of the load chains 6a and 6b. A bracket fixed to the upper frame 4a at the lower part of the upper front and rear sheaves 7a and 7b provided, 16a is a mounting frame for the elastic covering 15 provided at the lower part of the bracket 16, and 17 is provided at the upper part of the hanging metal part 12a. A mounting frame 18 of the stretchable cover 15 is stretched between the stretchable cover 15 and the load chains 6a and 6b, and guides the stretchable cover 15 so as not to contact the load chains 6a and 6b. A linear guide body 19 which is wound in conjunction with the operation, 19 is provided on the bracket 16 and interlocks with the lifting and lowering operations of the load chains 6a and 6b. A winding take winding device the guide body 18 Te.

  Next, the raising / lowering operation | movement of the load chain by the chain winding apparatus of a present Example is demonstrated. At the time of the load chain winding operation, the pair of load sheaves are driven synchronously by the drive motor 9, and the forward load chain 6b is wound around the lower sheave 8 provided below the chain block 5 by the rotation of the load sheave. It is hung on the upper front sheave 7b via the upper rear sheave 7a. On the other hand, the rear load chain 6a is wound around the lower sheave 8 and is wound around the upper rear sheave 7a.

  Further, when the load chain is lowered, the load chains 6a and 6b are fed out from the load sheave and wound around the lower sheave 8, and then the rear load chain 6a is suspended vertically on the upper rear sheave 7a. .

On the other hand, the front load chain 6b is suspended vertically through the upper front sheave 7 via the upper rear sheave 7a.
The two load chains 6 a and 6 b are moved up and down synchronously by a load sheave that is simultaneously driven by the same motor 9.

  In the chain hoisting device of the present embodiment, of the two load chains, the rear load chain 6a is wound around the lower sheave 8 provided below the chain block 5, and then the upper rear sheave 7a provided on the upper frame 4a. The load lifted by the load chain can be raised to the vicinity of the upper frame 4 without interfering with the chain block 5 and the bucket 11, so that it is higher than that of the conventional device. Thus, the dead space can be greatly reduced.

Further, since the front load chain 6b is wound and suspended around the load sheave, there is no problem that the winding tension is lowered unlike the hoisting device described in the conventional example, and a sufficient winding tension is provided. A hoisting device can be provided.
In order to solve the shortage of winding tension caused by the hoisting device described in the conventional example, a guide sheave is provided below the load sheave, the front load chain is suspended from the upper frame via the guide sheave, and the rear chain and the load sheave are Although a hoisting device that directly hangs down from the chain block has been proposed, in this device, in addition to the problem that the dead space is large, the front load chain is more forward than the rear load chain that hangs down from the chain block body. The chain length is increased by the distance (span) length between the load chain and the rear load chain, and the length of the slant extending from the upper frame to the guide sheave provided below the chain block. In this case, the difference in elongation between the front load chain and the rear load chain increases, and the load In this embodiment, the rear load chain 6a is wound around the lower sheave 8 from the chain block 5 until it is hung on the upper rear sheave 7a provided on the upper frame 4a. Since the parallel portion 20 that is sent out in parallel with the front load chain 6b is provided, the difference in length between the front load chain 6b and the rear load chain 6a fed out from the chain block is equal to the span of the front load chain. 6b and the rear load chain 6a is only the horizontal distance between the hanging position, the difference in elongation between the front load chain and the rear load chain is reduced, and the load inclination is reduced. Adjustment for keeping the load inclination horizontal Work is reduced.
Further, in this embodiment, the expansion and contraction covering the load chains 6a and 6b is performed between the upper sheaves 7a and 7b for hoisting and lowering the load chains 6a and 6b and the hanging metal fittings 12a installed at the lower ends of the load chains 6a and 6b. The covering 15 is provided, the upper part of the stretchable covering 15 is attached to the upper mounting frame 16a, the lower part is attached to the lower mounting frame 17, and the upper mounting frame 16a is attached to the bracket 16 attached to the upper frame 4a. 15 and the load chain 6a, 6b are provided with a winding device that winds the linear guide body 18 that guides the expansion / contraction covering 15 and is generated by the expansion / contraction covering 15 when the hoisting device is driven. As a result, the hoisting device suitable for the clean room can be provided and the load chains 6a and 6b can be prevented. A plurality of guide bodies 18 that move up and down in conjunction with the movement of the load chains 6a and 6b are provided between the elastic covering bodies 15 so that the lower part is engaged with the lower mounting frame 17, and the elastic covering bodies are provided. In the expansion / contraction operation, even if it contacts the guide body, it does not come into contact with the load chain. Therefore, the expansion / contraction covering 15 can be prevented from being damaged during the lifting / lowering operation of the load chains 6a and 6b.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG.

  FIG. 3 is a front view showing a stretched state of the load chain. In this embodiment, in order to hang the rear load chain 6a, a guide sheave 7c is provided in the center of the rear sheave 7a and the front sheave 7b provided at the hanging position of the rear load chain, and the rear load chain 6a is connected to the guide sheave 7c. It is configured to be folded back in the opposite direction and suspended from the rear sheave 7a. The rear load chains 6a and 6b are stretched in parallel from the load sheave to the lower sheave 8, the auxiliary sheave 7d, and the guide sheave 7c. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted. In addition, 12 is a hanging hook and does not have a vertical position adjustment function like the hanging metal fitting of Example 1.

  According to the present embodiment, the lengths of the front load chain 6b and the rear load chain 6a fed from the chain block 5 are the same because the parallel portion 20 and the turn-back portion 21 are provided. The vertical adjustment mechanism (12a, 12b of the first embodiment) for preventing the occurrence of a difference in elongation of the load chain during the up-and-down conveyance, allowing the load to be moved up and down horizontally, and obtaining the level of the load is provided. This eliminates the need for cost reduction and adjustment work.

  The present invention relates to a two-part suspension chain hoisting apparatus, in which a lower sheave is hung below a chain block mounted on a main body frame, and two load chains are hung on the extension of the main body frame, respectively. Front and rear two upper sheaves are suspended from the chain block. The two front and rear load chains fed from the chain block are hung on the lower sheave, the rear load chain is hung on the rear sheave, and hung forward. The load chain is stretched so that it hangs down from the front sheave, reducing the dead space when lifting and lowering the load, and having little effect on the span length between the front and rear load chains Therefore, it is suitable as a lifting device for roll paper or the like.

The front view of the chain hoisting apparatus of Example 1 of this invention. The side view of FIG. The front view which shows the tension state of the load chain in the chain hoisting apparatus of Example 2 of this invention. Schematic diagram of a conventional chain hoisting device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Travel rail 2 Traveling carriage 3 Traveling vehicle 3a Guide wheel 4 Main body frame 4a Upper frame 4b Chain cover 5 Chain block 6a Rear load chain 6b Front load chain 7a Rear sheave 7b Auxiliary sheave 7c Guide sheave 7d Auxiliary sheave 8 Lower sheave 9 Drive motor DESCRIPTION OF SYMBOLS 10 Traveling motor 11 Bucket 12 Hanging hook 12a Hanging metal fitting 12b Screw part 13 Operation box 14 Operation part 15 Telescopic covering body 16 Bracket 16a Upper mounting frame 17 Lower mounting frame 18 Guide body 19 Winding device 20 Parallel part 21 Folding part

Claims (3)

  A main body frame of a hoisting device having an extension in the front, a chain block provided on the main body frame and provided with two load sheaves, and two places including two front and rear load chains fed out from the chain block In the suspension chain hoisting device, the lower sheave is placed below the chain block, the front and rear two load chains are hung on the extension part of the main body frame, and the upper sheave hanging from the main body frame is provided on the front and rear. After hanging the two front and rear load chains from the lower sheave, the rear load chain is hung on the upper rear sheave and suspended, and the front load chain is hung on the upper front sheave. A two-part hanging chain hoisting device, wherein a load chain is stretched on a sheave so as to hang down.   2. The two-point suspended chain hoisting device according to claim 1, wherein a guide sheave is provided at the center of the upper front sheave and the upper rear sheave, and the rear load chain is hung on the upper rear sheave via the guide sheave. . The linear guide body is provided between the upper front sheave and the upper rear sheave and the lower ends of the two front and rear load chains, and a linear guide body is provided between the elastic coating body and the load chain. The two-part suspension chain hoisting device according to claim 1 or 2, wherein the body is wound in conjunction with the lifting and lowering operation of the load chain.

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