JPH0439259Y2 - - Google Patents

Description

[Detailed explanation of the idea] A. Industrial application field The present invention relates to a link chain lifting device.

B. Prior Art In conventional load lifting devices using link chains, one link chain is mainly wound around one chain block or two chain blocks on the left and right, and the kink of the link chain is connected to a limit switch. However, there has been no device to prevent or eliminate kinks. Also, there was no device to detect the load applied to each chain.

C. Problems to be Solved by the Invention Therefore, the chain entered the sheave in a kink state, and an abnormal force was applied to the chain, which could cause the chain to break. If the link chain were to break, the suspended load would fall freely, damaging the equipment underneath, and possibly resulting in personal injury.

The present invention solves the above problems and prevents chain kink, and even if some of the chains that enter the sheave break when the chain is in a normal state, other chains can prevent the suspended load from falling. The purpose is to provide loading equipment. Another object of the present invention is to provide a load lifting device having a device that prevents the chain from becoming kink.

D. Means for Solving the Problems In order to achieve the above object, the first configuration of the present invention includes a drive shaft that can be rotated by power, a plurality of drive constant sheaves fixed to the shaft, and A movable sheave having an independent shaft provided corresponding to each of the driving constant sheaves, a link chain stretched separately between the two sheaves, and one end of each of these chains suspended from a frame. an attached load cell;
The present invention further includes a turnbuckle interposed between the lower end of the movable sheave and the suspended load.

The second configuration adds a kink prevention part to the first configuration, in which both ends of a rotating arm having a horizontal axis that is powered and rotated are provided between the drive shaft and the chain belt and collide with the chain periodically. It is something that

E Effect When the drive shaft is rotated, the link chain is fed into or out of the bucket via the drive sheave, and the suspended load is lifted and suspended together with the moving sheave. As the moving sheave moves, the chain kink prevention device operates and shakes the chain as it enters the sheave, thereby eliminating the kink in the chain. Since multiple sets of chains and constant and dynamic sheaves are arranged in parallel, check the load display on the load cell to see if the load is applied evenly to each chain. If the load balance of each chain becomes unbalanced, operate the turnbuckle. If the load cell display exceeds the chain's allowable load, stop the motor and check for abnormalities. Furthermore, even if such an abnormal condition occurs and some of the chains are cut off, the remaining chains are independently engaged with the dynamic and drive sheaves, so
When the motor is stopped, the suspended load is suspended by these chains and will not fall freely.

F. Embodiment An embodiment of the present invention will be described below based on the drawings. As shown in Figures 1 to 3, the hanging device is
A plurality of link chains 3, one end of which is stretched on a frame 1 via a load cell 4, are drawn in or out by the operation of a chain drive unit 10, a movable sheave 14 that is individually suspended from each of these chains, and a Turnbuckle 5 interposed between load A
including.

Therefore, the chain drive unit 10 is connected to the frame 1.
One drive shaft 11 supported horizontally on a support frame 2 provided above, a plurality of drive constant sheaves 12 (four in the embodiment) fixed to the shaft, and these drive constant sheaves 12. First and second guiding sheaves 13 correspondingly arranged in parallel and in series
a, 13b, a reversible rotary motor 15 with a stopper for rotating the drive shaft 11, a reduction gear 16, and first and second couplings 17a, 17b.

A chain bucket 6 is provided below the driving constant sheave 12, and a kink prevention device 7 for the chain entering the driving constant sheave 12 from the bucket 6 is provided. As shown in FIG. 2, this device includes a rotary arm 7b having a horizontal shaft rotated by a motor 7a, and rollers 7c having a horizontal shaft provided at both ends of the arm 7b. The roller 7c is made to collide with the chain 3 periodically.

As shown in FIGS. 1 and 2, a kink detector 9 is provided below the drive constant sheave 12 and between it and the frame 1. As shown enlarged in FIG. 4, the kink detector includes a main body 9a that is swingable around a horizontal axis 9c;
A guide cylinder 9b is fixed to both sides of the main body and allows the link chain to pass in a normal state but not in a kink state, and the chain 3 is caught in the guide cylinder 9b, causing the main body 9a to swing. It consists of a limit switch (not shown) that stops the rotation of the motor 15 when detected.

The operating state will be explained above. motor 15
When activated, the drive shaft 11 is rotated, and the link chain 3 is retracted into or out from the bucket 6 via the drive constant sheave 12, and the suspended load A is lifted and suspended together with the movable sheave 14. At the same time, the chain kink prevention device is activated.

Since a plurality of link chains 3 and fixed and dynamic sheaves 12 and 14 are arranged in parallel, the load display on the load cell 4 is checked to see if the load is evenly applied to each chain. If the load display on the load cell becomes uneven, the turnbuckle 5 is operated.

When a kink state occurs when the link chain 3 is paid out, the kink state is canceled because the kink prevention device 7 is activated. The kink prevention device operates in conjunction with the operation of the reversible motor 15. That is, the activation signal of the motor 15 is applied to the kink prevention motor 7a, causing the motor to rotate.
Therefore, since the arm 7b rotates and periodically collides with the chain, causing the chain to swing, the kink in the chain is released by the collision energy of the roller 7c, and the chain enters the sheave in a normal state. Alternatively, the kink detector 9 is activated, the motor 15 is stopped, and the link chain 3 is stopped, making it clear that the link chain is abnormal.

Furthermore, even if some of the chains are cut off, the remaining chains are independently engaged with the fixed and moving sheaves 12 and 14, so if the motor 15 is stopped, the suspended load A will be moved by these chains. It is suspended and does not fall freely.

The present invention is not limited to the embodiments and examples described above, but includes various modifications without departing from the scope of the claims for utility model registration.

G. Effect of the invention As described above, the present invention has a drive shaft that can be rotated by power, a plurality of constant drive sheaves fixed to the shaft, and a drive shaft provided corresponding to each of these constant drive sheaves. A moving sheave having an independent shaft, a link chain stretched separately between each of the two leaves, a load cell attached to a frame by suspending one end of each of these chains, and a lower end of the moving sheave. and a turnbuckle interposed between the suspended load and the suspended load. Further, a chain kink prevention device is provided between the drive shaft and the chain belt. Therefore, the chain enters the sheave in a normal state with no kink, so there is no risk of the chain breaking. Even if some of the plurality of link chains break, the remaining chains will suspend and support the suspended load, and there is no risk of the suspended load falling, and there is no risk of personal injury due to the suspended load falling.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a side view, FIG. 3 is a rear view of the main part, and FIG. 4 is an enlarged side view of the main part of the kink detector. A... Hanging load, 1... Frame, 3... Link chain, 4... Load cell, 5... Turnbuckle,
7...Kink prevention device, 9...Kink detector, 1
0... Chain drive unit, 11... Drive shaft, 12...
Drive constant sheave, 14...Moving sheave, 14a...Moving sheave shaft, 15...Motor.

Claims (1)

[Claims for Utility Model Registration] (1) One power-rotatable drive shaft, a plurality of constant drive sheaves fixed to the shaft, and a drive shaft provided corresponding to each of these constant drive sheaves. A moving sheave having an independent shaft, a link chain stretched separately between the two sheaves, a load cell suspended from one end of each of these chains and attached to a frame, and a lower end of the moving sheave. A link chain lifting device comprising a turnbuckle interposed between the hanging load and a turnbuckle. (2) a drive shaft capable of power rotation, a plurality of constant drive sheaves fixed to the shaft, and a dynamic sheave having an independent shaft provided corresponding to each of these constant drive sheaves; A link chain is separately stretched between the two sheaves, a load cell is attached to a frame by suspending one end of each of these chains, and a load cell is interposed between the lower end of the movable sheave and the suspended load. and a kink prevention part that is provided between the drive shaft and the chain buckle and has a horizontal axis that is powered and rotated so that both ends of a rotating arm periodically collide with the chain. Link chain lifting device.