JPS6225516Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a hoisting machine, more specifically, a hoisting machine main body that supports a drive device equipped with a driving sprocket and a first idling sprocket, and a second idling sprocket. The present invention relates to a hoisting machine consisting of a load block, with a chain hanging from each of the sprockets, so that one chain is made into multiple threads, and the load-bearing capacity of the chain is increased.

Generally, in this type of hoisting machine, when there is only one drive device, the drive device is supported at one end in the lateral direction of the hoisting machine body, and the first idling sprocket is supported at the other end, and When there are two driving devices, the pair of driving devices are distributed and supported at both lateral ends of the hoisting machine body, and the first idling sprocket is supported in the middle. The load side of the chain, which is hung on the drive sprocket of the drive device, is hung on the second idle sprocket of the load block and the first idle sprocket of the hoist main body, so that the load block is suspended from the hoist. It is supported by the machine body via a chain.

However, when the hoisting machine performs horizontal pulling work, the drive device is made swingable in order to prevent the chain from moving diagonally and coming into contact with the chain holder of the drive device, thereby causing wear on the chain holder. Furthermore, as mentioned above, there is a space between the drive device, which is supported in parallel in the lateral direction of the hoist body, and the first idler sprocket, even if the drive device swings during horizontal pulling operation. 1st
The spacing is such that it does not come into contact with the idling sprocket. Therefore, when the load block has one second idler sprocket, or when a plurality of second idler sprockets are provided in the same row in the axial direction of the drive sprocket, it is particularly difficult to connect the drive sprocket with the drive sprocket. The chain line with the second free rotation sprocket will be inclined. Therefore, as the amount of hoisting of the chain increases, the angle of inclination of the chain line increases, and as a result, not only is it not possible to smoothly hoist and lower the chain, but irregular forces are applied to the chain. If the hoisting machine body is provided with a limit switch for restricting the hoisting of the chain,
Since the limit switch is operated by the inclined chain while there is a sufficient distance between the hoist body and the load block, the maximum hoisting amount of the chain is small.

The present invention was devised in view of the above points, and its purpose is to be able to always smoothly wind up and lower the chain, and to prevent irregular forces from acting on the chain. A further object of the present invention is to provide a hoisting machine that can increase the amount of hoisting of a chain even when a limit switch is provided on the hoisting machine body.

At least one drive device equipped with a drive sprocket on one side of the winding machine body having a hook, and at least one first idle sprocket on the other side, each having an axis in the same direction as the axis of the drive sprocket. A load block is provided that is swingably supported at the center and is provided with at least one second idling sprocket, and a chain is hung on each of the sprockets, while the second idling sprocket is attached to the road block. The free end of the chain, which is disposed at the center and hung on the first free-rotating sprocket, is fixed to the center of the road block, and the second
The idle sprocket has a diameter such that its chain winding side is located near a vertical line hanging down from the load side side of the drive sprocket, and the diameter of the idle sprocket is such that the It is characterized by the installation of a safety device consisting of a limit switch that stops the drive device.

Embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a winding machine main body, which has a driving device 3 equipped with a driving sprocket 31 and a support block 4 equipped with a first idling sprocket 41 between a pair of base plates 2 and 2a facing each other at a predetermined interval. The base plates 2, 2a are supported at a predetermined interval in the lateral direction so as to be swingable about an axis in the same direction as the axis of the drive sprocket 31, and the base plates 2, 2a between the drive device 3 and the support block 4. An upper hook 5 is supported in between. Note that the drive device 3
The drive sprocket 31 is rotatably supported and the drive motor 3 for the sprocket 31 is shown in FIG.
2 and a transmission gear mechanism 33 that transmits the driving force from the motor to the sprocket 31, and the first idle sprocket 41 of the support block 4 is connected to opposing side plates 42, 42.
It is rotatably supported between a.

Reference numeral 6 denotes a load block supported on the winding machine main body 1, which supports a second idler sprocket 62 in a freely rotatable manner between a pair of side plates 61, 61a facing each other at a predetermined interval; A lower hook 63 is supported below.

A chain 7 is hung on the drive sprocket 31, and the load side 7a of the chain 7 is hung on the second idling sprocket 62 and the first idling sprocket 41.
The end portion is locked to the upper part of the load block 6, and the load block 6 is supported by the hoist main body 1 via a chain 7.

Therefore, the second idler sprocket 62 of the load block 6 is arranged in the center of the loadblock 6, and the second idler sprocket 62
The chain 7 which is hung on the sprocket 62 has a diameter of
The chain winding upper side part 62a is set to a size close to a vertical line hanging down from the load side side part 31a of the drive sprocket 31, more specifically, within a range of 0 to 15 degrees with respect to the vertical line. be.

In addition, 43 in the figure is the first free rotation sprocket 41.
side plates 42, 4 on the radial sides of
A guide roller 64 rotatably supported between 2a
is a guide roller rotatably supported between the side plates 61 and 61a on the radial side of the second idler sprocket 62, and these guide rollers 43 and 64 rotate the second idler sprocket 62 to The suspended chain 7 is prevented from coming off from each of the sprockets 41, 62. Reference numerals 34 and 35 are safety devices that set the maximum hoisting amount of the chain 7 and prevent the chain 7 from engaging with the drive sprocket 31 in an incorrect state. It consists of an operator that operates only when the chain is hoisted up or when the chain passes in an incorrect state such as twisting, and a limit switch for stopping the drive motor 32. installed in a vertical line on the entry side to the sprocket 31 and near the drive sprocket 31;
When the chain 7 is hoisted beyond the maximum hoisting amount or when the chain 7 passes in an incorrect state, the operator operates in the direction of the driving sprocket 31, and the operation of this operator causes the limit switch to be activated. The drive motor 32 is opened and the drive motor 32 is stopped. Further, 8 is a chain storage container.

In the above embodiment, the drive device 3, the first idling sprocket 41, and the second idling sprocket 62
I explained about the one with one each,
The drive device 3 and the first and second free rotation sprockets 41 and 62 may each have a plurality of them. In this case, for example, the pair of base plates 2,
By increasing the distance between the base plates 2a, a pair of drive devices 3, 3 are distributed and supported on one lateral end of one base plate 2 and the other lateral end of the other base plate 2a among these base plates, A plurality of first idler sprockets 41 are arranged in parallel in the axial direction of the drive sprocket 31 between the base plates 2 and 2a between the drive devices 3 and 3, and are further arranged between the side plates 61 and 61a of the load block 6. Increase the interval between
Between these side plates 61, 61a and at the center of the load block 6, a plurality of second free rotation sprockets 62 are connected to the drive sprocket 31.
These sprockets 6 are arranged in parallel in the axial direction of
2, the chain 7 that hangs the second free rotation sprockets 62 on both sides in the row direction
The chain winding upper side portion 62a may be sized so as to be located near a vertical line hanging from the load side side portions 31a, 31a of the driving sprockets 31, 31. Further, when there is one first idle sprocket 41, this sprocket 41 may be freely rotatably supported between the base plates 2 and 2a.

As described above, the present invention has a drive sprocket and a second sprocket.
The chain line with the idle sprocket can be kept almost vertically at all times without being affected by the amount of winding up or down of the chain hung on the drive sprocket. Since the angle does not change, the tension applied to the chain can be kept constant at all times, and irregular forces can be prevented from acting on the chain.Furthermore, the amount of hoisting can be increased, and the hanging height of the roadblock can be reduced. It can be made bigger.

Furthermore, since the drive device and the support block are swingably supported with respect to the hoisting machine body, even when the load block is pulled laterally, the drive device and the support block are moved as the load block moves in the lateral direction. By swinging the device and supporting block,
Since the chain line connecting the driving sprocket and the second idler sprocket of the chain can always be maintained substantially perpendicular to its swing angle position, even during this horizontal pulling operation, the chain line cannot be hoisted up or The angle of the chain does not change during hoisting, making it possible to keep the tension applied to the chain constant, prevent irregular forces from acting, and increase the hanging height of the roadblock. The limit switch can be operated accurately even during work.

[Brief description of the drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a schematic front view and FIG. 2 being a schematic side view. 1... Hoisting machine main body, 3... Drive device, 34, 3
5...Safety device, 31...Drive sprocket,
31a... Load side side part, 41... First free rotation sprocket, 6... Road block, 62... Second
Sprocket for free rotation, 62a... side part on the upper side of chain winding, 7... chain, 5... upper hook.

Claims (1)

[Scope of utility model registration request] At least one drive device equipped with a drive sprocket is provided on one side of the winding machine body having a hook, and at least one first idler sprocket is provided on the other side, the axis of which is in the same direction as the axis of the drive sprocket. A load block is provided that is supported so as to be able to swing about the sprocket, and is provided with at least one second sprocket for free rotation, and a chain is hung on each of the sprockets. The free end of the chain, which is disposed at the center of the chain and hung from the first idling sprocket, is fixed to the center of the roadblock, and the second
The idle sprocket has a diameter such that its chain winding side is located near a vertical line hanging down from the load side side of the drive sprocket, and the diameter of the idle sprocket is such that the A hoisting machine characterized by being equipped with a safety device consisting of a limit switch that stops a drive device.