JPS6127959Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drum-shaped in-furnace roll for conveying workpieces such as pipe materials and bar materials in a furnace such as a heat treatment furnace.

[Prior art]

As is clear from FIG. 2, this roll 1 has a drum-shaped shape with a concave center in the axial direction, and is installed in a furnace by being attached to a hollow shaft 3 through which a cooling water injection pipe 4 is inserted. In the figure, 5 is insulation material, 6
7 is a furnace wall, 7 is a bearing, 8 is a drive sprocket, and 9 is a rotary joint. Also this roll 1
As shown in Fig. 1, the workpiece 2 is not placed perpendicular to the direction of movement of the workpiece 2, but is placed at a certain angle α, so that the workpiece 2 can be sent at the same time.
is rotated around its axis to prevent meandering and uneven heat of the workpiece 2.

The roll 1 is installed and used in this way, but when the roll 1 is required to withstand high temperatures and heavy loads, the following problems have arisen with conventionally provided rolls. First, Figure 3a
What is shown in the figure is the roll outer cylinder 1 that constitutes the roll 1.
0 and a pair of side plates 11 and 12, which are hubs at both ends of the roll outer cylinder 10, are integrally cast.
In this case, it is difficult to ensure quality if the thickness is thick in terms of casting, and it is difficult to satisfy the usage conditions of high temperature and heavy loads, so it can only be used for light loads. In the conventional example shown in FIG. 3b, a roll outer cylinder 10 and a pair of side plates 11 and 12 are formed separately, and both side plates
1 and 12 are welded and fixed to each end of the roll outer cylinder 10. This product can be made thick due to casting, but since both side plates 11 and 12 are welded and fixed to the roll outer cylinder 10, the reliability of welding has a great effect on this roll 1. Therefore, it is unsuitable for use at high temperatures and heavy loads. Further, in the conventional example shown in FIG. 3c, the roll 1 is a solid cast product, and has a structure that can withstand heavy loads at high temperatures. However, in this case, there are problems such as the shape is limited by the outer diameter of the roll 1 and the diameter of the shaft 3, the roll 1 tends to be heavy, and the heat loss from the water-cooled shaft 3 increases. This occurs because it is solid.

[Purpose of invention]

The present invention was developed in view of the above points, and its purpose is not only to be able to withstand high temperatures and heavy loads, but also to be hollow, so there are no restrictions on shape, and to be lightweight and able to withstand heat from the shaft. To provide a roll in a drum-shaped furnace for conveyance with less loss.

[Structure and action of the device]

Therefore, the present invention consists of a drum-shaped roll outer cylinder, one side plate formed integrally with the roll outer cylinder at one end of the roll outer cylinder, and the other side plate welded and fixed to the other end of the roll outer cylinder. , the inner surface of the roll outer cylinder is characterized in that the one end side is thicker than the other end side, and one side plate is integrated with the roll outer cylinder, while the other side plate is integrated with the roll outer cylinder. In addition, the end of the roll outer cylinder that is welded to the side plate is thinner than the end with the integrated side plate, so the roll outer cylinder The tube can be shaped to have the best solidification conditions within its casting,
Therefore, it is possible to make the roll thick enough to withstand heavy loads at high temperatures.Moreover, the difference in wall thickness at both ends of the roll outer cylinder appears as a difference in the load capacity at both ends, but as mentioned above, this roll has a large thickness that can withstand heavy loads at high temperatures. Considering that it is installed at a certain angle rather than perpendicular to the direction, and more impact load is applied to one side than the center in the axial direction, the above-mentioned The difference in wall thickness corresponds to the load, which makes it possible to reduce the weight compared to when the thickness is the same, and it is possible to reduce the weight by welding when fixing the roll outer cylinder and one side plate. This makes it possible to prevent reliability from having a large impact on load-bearing performance.

〔Example〕

To further explain the present invention in detail based on the illustrated embodiment, as shown in FIG. 12, the roll outer cylinder 10 and one side plate 11 are integrally cast and formed, and the outer peripheral edge of the other side plate 12 is welded and fixed to the inner peripheral edge of one end of the roll outer cylinder 10. Thus, it is attached to the roll outer cylinder 10. The wall thickness of the roll outer cylinder 10 gradually decreases from one end where the side plate 11 is integrally provided to the other end where the side plate 12 is attached. The difference is that the inner surface of the roll outer cylinder 10 is shaped so that the inner diameter at the other end is larger than the inner diameter at the one end, that is, the outer surface of the roll outer cylinder 10 is symmetrical across the axial center. This is achieved by making the inner surface asymmetrical.

FIG. 6 shows the stress distribution in the axial direction of the roll 1 when the workpiece 2 is placed on the roll 1, and FIG. 7 shows the stress distribution in the circumferential direction. Note that this is a case where the workpiece 2 is placed perpendicularly to the roll 1. Further, the solid line indicates the principal stress on the inner surface of the roll 1, and the broken line indicates the principal stress on the outer surface of the roll 1, and the stress distribution in the circumferential direction is measured at the cross section at the maximum stress value on the upper surface. - and - in each drawing indicate measurement points in the drawing of the roll 1 added to each drawing.

Now, as is clear from Fig. 6, the principal stress at the two points where the workpiece 2 contacts each shows a peak value, and since there is a difference in wall thickness at these two points, the thicker one is The peak value of principal stress is small.
In other words, the roll 1 has a margin of load capacity on the one end side corresponding to the difference in peak value.
Therefore, as shown in FIG. 5, by installing the roll 1 at an angle α to the traveling direction of the workpiece 2 shown by the arrow, the roll 1 can absorb the impact load with a thicker wall that has a higher load capacity. You can receive it in the part where it was given. Regarding the thin walled portion, it contributes to the weight reduction of the roll 1, and since there is no need to consider impact load, the overall load capacity does not become small.

[Effect of idea]

As is clear from the above, in the present invention, it is possible to increase the thickness to withstand heavy loads at high temperatures, and also to cope with local stress and prevent the overall thickness from increasing, thereby reducing weight. Furthermore, there are no restrictions on shape, and furthermore, heat loss is small.

[Brief explanation of the drawing]

Figure 1 is a plan view showing how the rolls are installed, Figure 2
The figure is a sectional view of the same as above, Figures 3a, b, and c are sectional views of the conventional example, and Figures 4a, b, and c are a cutaway front view, right side view, and left side view of an embodiment of the present invention. FIG. 5 is a schematic horizontal sectional view showing the installation state of the same as above, and FIGS. 6 and 7 are stress distribution characteristic diagrams of same as above. 1 is a roll, 10 is a roll outer cylinder, and 11 and 12 are side plates.

Claims (1)

[Scope of utility model registration request] It consists of a drum-shaped roll outer cylinder, one side plate integrally formed with the roll outer cylinder at one end of the roll outer cylinder, and the other side plate welded and fixed to the other end of the roll outer cylinder. The tube is a drum-shaped furnace roll for conveyance, and has an inner surface shape such that the one end side thereof is thicker than the other end side.