JPS60252592A - Improved hoist - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hoist that can be operated in a confined space with limited headroom.

In the nuclear industry, shipping of calibrated nuclear fuel involves placing the fuel into a container and positioning the container into a shipping flask. The flask has a removable closure at one end and a voice at the opposite end so that when the flask is upright, a hoist can be used to lift the container into and out of the flask. Since hoisting operations are frequently performed in locations with limited head space, it is desirable to make the hoist as compact as possible and to avoid overlapping of the hoist cables during winding and unwinding operations.

According to the invention, the hoist is arranged along the drive shaft
! It has a hollow cylindrical body that can move in the III-line direction and rotate with the drive shaft, and this cylindrical body has a helical groove on its outer surface for receiving the cable, and this helical groove cooperates with a complementary fixing part shrine. The cylindrical body and the threaded connection part are formed by this, whereby the cylindrical body is rotated by the shaft to move the cylindrical body in the axial direction along the shaft, and the winding and unwinding operations are performed so that the cable is connected to the cylinder. Staying at the same axial position with respect to the body is considered an ll-7 sign.

As a result, the cable clip remains in the same axial position relative to the cylinder, and axial movement of the cylinder causes the cable to follow the cylinder helical groove during winding and unwinding.

The invention will be further described, by way of example, with reference to the accompanying drawings, in which: FIG.

The hoist has a hollow cylindrical body 1 attached to a shaft 2, and the shirts 1-2 are rotatably supported by a bearing assembly 3 mounted on a support member 4. The support member 4 is the end closure of a transport flask for receiving nuclear fuel. The shaft 2 is connected via a suitable coupling to a drive motor mounted on a support member 4. In FIG. 1, two steel ropes or cables 5 and 6 are wound around a cylinder 1, the ends of the ropes extending from the cylinder and supporting parts 4.
The load in the flask is guided through the opening in J4. When rotating the cylinder 1, loads can be moved up and down the flask through a removable closure at the opposite end of the flask.

Two spiral grooves 7 and 8 are formed in the cylindrical body 1 to receive the lobes 5 and 6, respectively. The spiral groove is the support member 4
It cooperates with guide rollers 9 and 10, which are respectively supported on annular support brackets I. 11 and 12, which are fixed on.

For example, each bracket may support equiangularly spaced rollers disposed around the cylinder and engaging the helical groove.

As can be seen in FIG. 2, the shaft 2 is of square cross section and the cylindrical body 5 is attached to the shaft 2 by a linear bearing assembly 13. The bearing assemblies 13 are arranged in pairs, each row supported by a housing 14 fixed to the cylindrical body 1, with each bearing assembly fitted on a respective side of the square shaft 2. This allows the cylindrical body to be rotationally coupled with the shirt i and to be moved axially along the shaft.

In FIG. 1, the cylinder is shown in its end position with the rope wrapped around the cylinder and located within the threaded groove.

When the drive motor is actuated to rotate the shaft 2, the cylinder rotates and during such rotation the threaded connection consisting of the threaded groove and the guide rollers 9 and 10 and the support assembly 13
The cylindrical body is thereby moved in the axial direction along the shaft 2. Thus, in Figure 1, as the cylinder moves to the right, lobes 5 and 6 unwind from around the cylinder.

Reverse rotation of the shaft 2 causes the cylinder to move axially in the opposite direction, wrapping the lobe around the cylinder.

During winding and unwinding, the ropes 5 and 6 follow the grooves of the cylindrical body and wind around the cylindrical body without overlapping.

The position of each steel lobe leaving the cylinder remains constant during both the winding and unwinding operations.

In the illustrated embodiment, the same effect can be achieved with only 13 rollers, such as rollers 9, using two sets of guide rollers to effect the axial movement. This can also be achieved by using only the guide roller (2).

[Brief explanation of drawings]

Figure 1 is a partial cross-sectional schematic diagram of the wheel I section;
The figure is a cross section taken along line A--A in FIG. 1...Hollow cylindrical body 2...Ji・Fl
-3...Bearing assembly

Claims (1)

[Scope of Claims] (1) A hollow cylindrical body 1 that can move axially along a drive shaft 2 and rotate together with the drive shaft 2, and this cylindrical body I has a structure for receiving a cable 5 on its outer surface. The helical groove 7 cooperates with the fixing member 9 to complement each other to form a screw connection with the cylindrical body 1, so that rotation of the cylindrical body 1 by the shirt 1-2 causes the cylindrical body 1 to A hoist characterized in that the winding and unwinding operations are performed by moving the cable 5 axially along the shaft 2, while the cable 5 remains in the same axial position relative to the cylindrical body 1. (2) The threaded connection part is rotatably attached to the annular fixed support bracket 11 and has at least one set of guide rollers 9 that can engage with the grooves of the cylindrical body. The hoist described in. (The hoist according to claim 2, characterized in that 31 sets or each set of guide rollers 9 are positioned at equiangularly spaced positions around the cylindrical body l. 4. A hoist according to any one of claims 1 to 3, which is attached to an end closure of a flask for receiving it.