JP2003285148A - Rail for casting carriage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide rails for a casting carriage capable of hardly generating shocks when the casting carriage passes their joint portions and further capable of preventing the problem of curling up of the rails at the joint portions. <P>SOLUTION: The rail 21 for running of the casting carriage carrying rotary molds for centrifugal casting, has a joint portion 30. In the joint portion 30, at least a rail head portion 22 has a first face 27 heading from the side portion 25 by which the flange of the wheel of the casting carriage passes toward the central axis of the rail 21 along the direction crossing the rail 21 and a second face 28 formed following the first face 27 in an oblique direction relative to the rail central axis such that the angle relative to the rail center axis becomes smaller than that of the first face 27. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rail for a casting truck. [0002] In the case of centrifugally casting ductile cast iron tubes, a casting cart is often used. As shown in FIG. 3, the casting cart 1 has a horizontal rotating mold (not shown) inside the casting cart 1, and is positioned on a horizontal rail 2 between a casting position 3 and a drawing position 4. It is possible to move. At a casting position 3, a triangular ladle 5 and a pouring trough 6
When the casting cart 1 reaches the casting position 3 as shown by a virtual line in FIG.
Is inserted into the rotary mold of the casting cart 1, and the molten metal is supplied into the rotary mold, whereby the ductile cast iron tube is centrifugally cast. [0004] Thereafter, the casting carriage 1 reaches a drawing position 4 as shown by a solid line in FIG. 3, and at this drawing position 4, the cast iron tube is drawn horizontally from the rotary mold. As described above, the casting cart 1 reciprocates on the rail 2, and the rail 2 is divided into two along its length direction, that is, along the running direction of the casting cart 1. Numeral 7 denotes a joint part constituting the divided part, and the rail 2 is divided into a first part 2A and a second part 2B by the joint part 7. The reason why the rail 2 is divided into the first portion 2A and the second portion 2B by the joint portion 7 is as follows. That is, when the casting trolley 1 travels repeatedly, it is necessary to repair or replace the rail 2, but the casting trolley 1 is a heavy object. Have difficulty. Therefore,
After the casting cart 1 is retracted onto one of the first rail 2A and the second rail 2B, the other is repaired or replaced. After that, the casting trolley 1 is replaced with the other of the first rail 2A and the second rail 2B, that is, the one on which the work such as repair and replacement has been completed. Repair or replace the other rail. As described above, the rail 2 is divided into the first rail 2A and the second rail 2B by the joint portion 7, and the repair and replacement work is performed alternately while moving the casting trolley 1. Work can be performed over the entire length of the rail 2 without taking out the casting cart 1 out of the rail. [0007] Conventionally, the joint portion 7 has an end surface 8 of the first portion 2A and an end surface 9 of the second portion 2B of the rail 2 as shown in a plan view of FIG. But rail 2
Are generally formed in a direction perpendicular to the central axis of the two and connected to each other. However, in such a structure, since the joint 7 at the head 10 of the rail 2 simultaneously contacts the wheels of the casting truck 1 over the entire width of the head 10, in other words, the wheels of the casting truck 1 are connected at one time. Since the vehicle must pass through the section 7, there is a technical problem that an impact is generated at the time of traveling of the casting trolley 1 as in the case of a normal railroad rail, which causes a hindrance to smooth traveling. As a countermeasure against this, as shown in FIG.
The end face 8 of the first portion 2A of the rail 2 and the second
The end surface 9 of the portion 2B is formed obliquely with respect to the center axis of the rail 2 has been proposed. In such a case, the wheels of the casting cart 1 at the head 10 of the rail 2 gradually pass through the seam 7 along the width direction of the head 10, as shown in FIG. An impact is hardly generated, and the casting cart 1 can run quietly. However, when the joint 7 is formed in the oblique direction, an acute edge 11 is formed on the head 10 of the rail 2. If the traveling direction of the vehicle is only one in principle, as in the case of a double track rail, even if such an edge occurs, make sure that the wheel passes only from the wide side of the edge to the narrow side of the tip. By doing so, there is no problem. However, casting trolley 1
In the case of the traveling rail 2, since the casting cart 1 reciprocates as described above, the wheels pass in the direction of the arrow X from the narrow end to the wide end of the edge portion 11 shown in FIG. 5. .
In this case, there is a technical problem that a problem such as the fact that the flange of the wheel hits the tip 12 of the edge portion 11 and the tip 12 is turned up easily occurs. [0011] Therefore, the present invention is to reduce the impact of the casting truck on the rail for the casting truck when the casting truck passes through the joint, and further to reduce the problem of the rail turning up at the joint. The purpose is to: [0012] In order to achieve the above object, the present invention provides a rail for running a casting truck on which a rotary mold for centrifugal casting is mounted, the rail having a joint, and the joint having the joint. Then, at least the rail head has a first surface facing the center axis side of the rail along a direction crossing the rail from a side portion of the flange of the wheel of the casting truck on the side of the flange, and following the first surface, A second surface is formed obliquely to the rail center axis so that the angle with respect to the rail center axis is smaller than the first surface. With such a structure, at least the rail heads of the pair of rails joined to each other at the joint have the second surface formed obliquely with respect to the rail center axis. The wheel gradually passes through the joint at the portion of the second surface along the width direction of the rail, so that it is possible to reduce the possibility of generating an impact. Further, since the rail head has a first surface extending from the side of the passage side of the flange of the wheel to the center axis side of the rail along a direction crossing the rail, the flange of the wheel has the first surface at the joint portion. The edge of the surface of
Therefore, the rail does not hit the tip of the sharp edge as in the related art, so that problems such as curling of the rail can be prevented. FIG. 1 and FIG. 2 show a rail for cast truck 21 according to an embodiment of the present invention. In FIG.
(A) is a plan view of the rail 21 and (b) is a front view thereof. The rail 21 has a head 22 and a web 23
And a bottom 24. In the head 22, reference numeral 25 denotes a side of the casting truck where the flange of the wheel passes, and reference numeral 26 denotes a side where the flange does not pass. Reference numeral 30 denotes a joint. As shown in FIG. 2A, the joint 30 is formed so as to have a Z-shape in plan view. More specifically, one rail portion 21A and the other rail portion 21B constituting the joint portion 30 are connected to the side portions 25A.
A first surface 27 extending toward the center axis of the rail 21 along a direction traversing the rail 21 from the first direction, and a second surface formed obliquely to the center axis of the rail 21 following the first surface 27. It has a surface 28 and, following the second surface, a third surface 29 formed along the direction crossing the rail 21 from the center axis side of the rail 21. In the illustration, the first surface 2
The seventh and third surfaces 29 are formed in a direction perpendicular to the central axis of the rail 21. These first to third surfaces 27
29 are similarly formed on the web 23 and the bottom 24 of the rail 21. The first to third surfaces 27 to 29 are formed by, for example, cutting one rail into a Z-shape as shown in FIG. 21B can be formed simultaneously. In such a configuration, at the joint portion 30, one of the rail portions 21A and the other rail portion 21B of the rail 21 abut against each other, and the first surfaces 27, 27 of the two rail portions are connected to each other. Face 2
8, 28, the third faces 29, 29 face each other. Therefore, the wheels of the casting cart are connected to the joint 3
In the portion of the second surface 28 of 0, the seam portion 30 gradually passes along the width direction of the rail 21 as in the case shown in FIG. For this reason, the wheel is
Impact when passing through the vehicle. The seam portion 30 is formed in a direction perpendicular to the center axis of the rail 21 from the side portion 25 of the head portion 22 of the rail 21 on the passage side of the flange of the wheel toward the center axis of the rail 21. Of the first surface 27 at the edge of the first surface 27.
7 will be moved in a direction orthogonal to the direction of FIG. For this reason, unlike the case shown in FIG. 5, the flange of the wheel does not hit the tip of the acute-angled edge portion, so that it is possible to prevent the rail from being turned up at the joint portion 30. In the case where the aim is to reduce the impact at the time of the passage of the wheel at the joint portion 30 and to prevent the rail 21 from being turned up as described above, the third surface 29 is not necessarily provided. Not necessary. For this reason,
As shown by a virtual line in FIG.
Can be formed so as to reach the side portion 26 of the head 22 of the rail 21 and the edge of the bottom portion 24 of the rail 21, and the third surface 29 can be omitted. However, when the first surface 27 and the third surface 29 are formed at right angles to the center axis of the rail 21 as described above, the one rail portion 21A and the other rail portion 21B are thereby separated. Positioning can be accurately performed in the length direction on one side and the other side of the rail 21. Also, as described above, one rail portion 21A and the other rail portion 21
B is positioned in the length direction on both one side and the other side of the rail 21, so that the joint 30
The one rail portion 21A and the other rail portion 2
1B can be prevented from bending with each other. Since the first surface 27 and the third surface 29 have a function of preventing the occurrence of the turn-up on the rail 21 and positioning one and the other rail portions 21A and 21B as described above. Therefore, it is not necessary to make the length of the head 21 of the rail 21 along the width direction too large. If the first surface 27 and the third surface 29 formed at right angles to the center axis of the rail 21 are too long, an impact is likely to be generated during running of the casting cart, and the second surface in the oblique direction is generated. This is contrary to the intent of forming 28 to mitigate the impact during the running of the casting cart. Conversely, the second surface 28 is desirably formed as long as possible from the viewpoint of cushioning the impact. The seam portion 30 can be formed in a Z-shape in plan view as shown by a solid line in FIG. 2A, that is, inclined so as to rise rightward in FIG. As shown in FIG. 2, it can be formed so as to be inclined to the left in FIG. The reason for forming the seam portion 30 in such a manner as to be inclined upward and downward or upward and to the left is due to the relationship with the wheels of the casting truck as described above. Therefore, it suffices that at least the head 22 of the rail 21 on which the wheel acts is inclined upward or downward or upward. The web 23 and the bottom 24 of the rail 21 may have surfaces of any other shapes. For example, the web 23 and the bottom 24 may have only a surface formed at right angles to the central axis of the rail 21. As described above, according to the present invention, at the joint portion of the rail for running the casting trolley on which the rotary mold for centrifugal casting is mounted, at least the rail head is provided with the wheels of the casting trolley. A first surface extending from the side of the flange on the passing side toward the center axis of the rail along a direction crossing the rail, and an angle with respect to the rail center axis is greater than the first surface following the first surface. Since it has a second surface formed obliquely to the center axis of the rail so as to be smaller, the wheel of the casting cart has a joint at the second surface along the width direction of the rail. Will gradually pass through,
For this reason, it is possible to make it hard to generate an impact, and the flange of the wheel passes through the edge of the first surface at the joint portion in a direction intersecting with the first surface,
Since it does not hit the tip of the sharp edge portion as in the related art, it is possible to prevent a problem such as turning over of the rail from occurring.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a main part of a rail for a casting truck according to an embodiment of the present invention. FIG. 2 is a view showing a joint portion of the rail for a casting truck according to the embodiment of the present invention. FIG. 3 is a schematic configuration diagram of a centrifugal casting apparatus including a casting cart. FIG. 4 is a plan view showing a joint portion of a conventional rail for a casting truck. FIG. 5 is a plan view showing another joint portion of the conventional rail for a casting truck. [Description of Signs] 21 Rail for casting truck 22 Head 25 Side 27 First surface 28 Second surface 30 Joint

Claims (1)

Claims 1. A rail for running a casting cart equipped with a rotary mold for centrifugal casting, the rail having a joint portion,
In this joint portion, at least the rail head has a first surface facing the center axis side of the rail along a direction crossing the rail from a side portion on the passage side of the flange of the wheel of the casting truck, and a first surface. And a second surface formed obliquely with respect to the rail center axis such that the angle with respect to the rail center axis is smaller than the first surface.