JPH0222112Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lifting tool for lifting and transporting an annular core for casting.

A general casting core is installed in a mold after processes such as molding, coating, and drying.For example, an annular core for the socket of a centrifugal casting pipe is suspended between each process point. It is often transported in a closed state. By the way, as shown in FIG. 1, conventionally, the annular core 1 for the socket has, for example, a three-prong chuck 2
The outer circumferential surface 3 of the chuck 2 is held between the chuck 2 and the core 1 is lifted up, and a pressing force 4 is applied to the core 1 in the direction toward the center.As a result, the core 1 between the chuck 2 is lifted up. Bending stress will act on it. However, such a core 1 is usually extremely fragile;
For example, cracks 5 may occur due to the bending stress and damage may occur.

Therefore, the purpose of this invention is to prevent harmful bending stress from being generated in the annular casting core when it is lifted and transported, thereby preventing damage to the core. It is.

In order to achieve this purpose, the present invention provides a plurality of pairs of chucks in the circumferential direction of the lower balance, which are configured to be openable and closable so that the annular core can be held between the inner and outer peripheral surfaces of the chuck. An upper balance is provided that can be raised and lowered relative to the lower balance by a fixed stroke, and the chuck is interlocked with the upper balance,
It opens when the upper take-up is lowered relative to the lower take-up, and closes when the upper take-up is lifted and raised relative to the lower take-up, making it possible to clamp the core. be.

Therefore, only a compressive load acts on the annular core portion between each pair of chucks, preventing harmful bending stress from acting on the entire core, and preventing damage to the core due to this bending stress. In addition, by simply raising and lowering the upper take-up relative to the lower take-up, the chuck linked to the upper take-up can be opened and closed, making it possible to lift and transport the core by holding it between the chucks. can be done easily and efficiently.

Examples of the present invention will be described below. Figures 3 to 5 show an embodiment of the core hanging device according to the present invention, in which 6 is an upper balance, a vertical post 8 with a lower end stopper 7, and a ceiling located at the upper end of the post 8. A plate 9, three sets of horizontal upper rods 10 each consisting of a pair of plate bodies and arranged radially from the upper end of the post 8 along the top plate 9, and a hanging ring 11 are fixed integrally. 12 is a lower balance, which includes a hollow weight 13 that is fitted onto the post 8;
It has three sets of horizontal lower rods 14 arranged radially in correspondence with the upper rod 10, and is movable up and down along the post 8 to the lower end stopper 7 position, so that The relative position is variable.

Reference numeral 15 denotes a bracket fixed to each upper rod 10 by a pin 16, and its radial position can be changed through a mounting hole 17. A horizontal pin 18 is attached to the bottom of the bracket 15. 1
9 is a leg, which has a vertical long hole 20 in the upper part that engages with the pin 18, and the center part of which is connected to the pin 3.
7 engages with the elongated hole 21 of the lower rod 14, and has a stopper 22 at the bottom for fitting onto the upper surface of the core 1.
The elongated holes 21 of the lower rod 14 are provided in the horizontal direction corresponding to the arrangement of the mounting holes 17.

The pin 18 has a pair of dogleg-shaped arms 23A, each of which has a lower end open when the upper end is closed.
23B is swingably attached. At the lower ends of the arms 23A, 23B are chucks 24A, 24.
B are provided respectively. Also, arm 23
The upper end of A, 23B and the pin 18 are connected to the connecting arm 2.
They are connected to each other by 5A and 25B. Therefore, when the upper balance 6 and the lower balance 12 are separated from each other, the pin 18 will be located at the upper part of the elongated hole 20, and the connecting arms 25A and 25B will open, thereby causing the arms 23A and 23B to swing. The chucks 24A, 24B will close together. Further, when the upper balance 6 and the lower balance 12 approach each other, the pin 18 will be located at the lower part of the elongated hole 20, and the connecting arms 25A and 25B will close, and contrary to the above, the chucks 24A and 24B will open to each other. become. Note that the upper balance 6 is provided with a hook 26, and the weight 13 of the lower balance 12 is formed with a recess 27 in which the hook 26 engages, so that both the balances 6 and 12 can be held close to each other. The chucks 24A, 24B can be held open.

The detailed structure of the chucks 24A and 24B will be explained. Bosses 28 are attached to the lower ends of the arms 23A, 23B, and each boss 28 has a
A bolt 30 having a locking annular groove 29 is screwed into the bolt. 31 is an inner chuck member that can come into contact with the inner circumferential surface 32 of the core 1, and 33 is an outer chuck member that can come into contact with the outer circumferential surface 3 of the core 1, each of which is hooked in the annular groove 29. Inner chuck member 31
is made of a metal material, and the outer chuck member 3 has a rubber material 35 bonded to a metal member 34. That is, since the outer circumferential surface 3 of the core 1 is used to form the inner surface of the socket of the centrifugally cast tube as a finished product, care is taken to prevent this outer circumferential surface 3 from being damaged.

In this way, since the core 1 is held between the inner circumferential surface 32 and the outer circumferential surface 3 by the pair of chucks 24A and 24B, as shown in FIG.
In this case, the compressive load 36 only acts on the portion between the chucks 24A and 24B, and harmful bending stress can be prevented from acting on the core 1.

Hereinafter, the lifting and transporting operation of the core 1 will be explained based on FIGS. 6 to 8. First, the bracket 15 is pinned to the mounting hole 17 at an appropriate position according to the diameter of the core 1 to be lifted, and the bolts 30 of the chucks 24A and 24B are rotated according to the wall thickness of the core 1. The distance between the outer chuck members 31 and 33 is adjusted. after that,
As shown in FIG. 6, the hook 26 is engaged with the weight 13 to hold the chucks 24A and 24B in an open state, and the hanging ring 11 is hoisted with a hoist or the like to position the hanging tool above the core 1.

Next, as shown by the solid line in FIG. 7, the main hanging tool is lowered and placed on the core 1 using the stopper 22.
After that, remove the hook 26 manually, etc., and
1 is lifted slightly, the lower balance 12 remains on the core 1 due to its own weight, and only the upper balance 6 is attached to the elongated hole 2.
Move upward by the amount corresponding to 0. As a result of this movement, both the balances 6 and 12 are separated from each other, and the chucks 24A and 24B are closed as described above, and the core 1 is held between them as shown by the phantom lines. The clamping force is generated by the lower balance 12 including the weight 13, the arm 23A,
It is generated by the weight of 23B. When the hanging ring 11 is further lifted from this state, the core 1 is also lifted together with the main hanging tool and transported to a predetermined location.

At this time, there is no possibility that harmful bending stress will be generated in the core 1 as described above. In addition, if the diameter of the core 1 is different from the position of the mounting hole 17, the arms 23A, 23B and the lower rod 14
Since the arms 23A and 23B engage with the core 1 with the pin 18 as the center,
It is possible to absorb the dimensional difference by swinging in the radial direction.

When the core 1 is lowered to the target location as shown in FIG. 8, the upper balance 6 descends due to its own weight and approaches the lower balance 12, and the chuck 2
4A and 24B open. At the same time, the hook 26 engages with the recess 27 due to its own weight, and the chuck 24
A, 24B will be held open. As a result, the present hanging tool is in the same state as shown in FIG. 6, and other cores 1 can be lifted and transported repeatedly.

As described above, according to the present invention, only compressive load is applied to the annular core portion between each pair of chucks, and harmful bending stress can be prevented from acting on the entire core. Not only can damage to the core be prevented, but by simply raising and lowering the upper take-up relative to the lower take-up, the chuck linked to the upper take-up can be opened and closed. The work of lifting and transporting children can be carried out easily and efficiently.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the state of load action in the conventional example, FIG. 2 is a diagram showing the state of load action in the present invention, FIG. 3 is a front view of an embodiment of the present invention, and FIG.
The figure is an enlarged view of the main parts, Figure 5 is a plan view, and Figure 6 is an enlarged view of the main parts.
8 to 8 are explanatory diagrams of the operation. 1...core, 3...outer surface, 6...upper balance,
12...Lower balance, 23A, 23B...Arm,
24A, 24B...chuck, 32...inner peripheral surface.

Claims (1)

[Claims for Utility Model Registration] A plurality of pairs of chucks configured to be openable and closable so as to be able to hold an annular core between its inner and outer circumferential surfaces are provided in the circumferential direction of the lower balance; An upper balance that can be raised and lowered relative to the balance by a certain stroke is provided, and the chuck is interlocked with the upper balance,
It opens when the upper take-up is lowered relative to the lower take-up, and closes when the upper take-up is lifted and raised relative to the lower take-up, making it possible to clamp the core. A hanging tool for cores characterized by: