JPH0432495A - Ingot holding tong - Google Patents

Abstract

PURPOSE:To ensure hanging of a new ingot at the time of holding the ingot by forming a holding unit by projected stripes projected outside an ingot holding punch horizontally lower than the punch, and allowing the projected stripes to freely rotate, and to return the horizontal position when no ingot is held. CONSTITUTION:On the lower end of holding arms 2 capable of freely opening and closing, a holding punch 4 and plural projected stripes 5 formed parallelly to each other are provided as a holding unit 3. The projected stripes 5 are fixed integrally with the punch 4, and the protruded length of the projected stripes 5 is made slightly shorter than that of the punch 4. The holding unit 3 is mounted to one end of a rotary shaft 6 in the arms 2 so that it can freely rotate, and a sprocket 7 is provided to the other end of the shaft 6. Two tensile force addition devices 8A, 8B are provided above the holding unit 3, a chain 14 at a lower end of a rod 11 pressed by a spring 10 is laid over the sprocket 7 from both sides, and the shaft 6 allows the projected stripes 5 to become horizontal when no ingot is held. Thus, the ingot can freely rotate when it is hung, and the projected stripes 5 are returned to the horizontal position when they separate from the ingot.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to ingot gripping tongs used for gripping ingots such as slabs, and in particular, to the gripping portion that actually comes into contact with the ingot. The present invention relates to ingot gripping tongs having the following characteristics.

[Conventional technology]

For example, when an ingot such as a slab is suspended and transported, the slab is gripped by a gripping device called a tong, which is installed on a crane or the like.

As shown in FIG. 6, this tong 1 is equipped with a pair of gripping arms 2 that can be opened and closed, and an ingot 20 such as a slab is actually held inside the lower end of the gripping arms 2. A contact gripping portion 3 is provided. Conventionally, this gripping portion 3 has generally been constituted by a punch 4 formed in a conical or papillary shape as shown in the figure. However, the gripping part 3, which is constituted only by the punch 4, bites into the ingot 20 more than necessary, and the bite marks remain even after the ingot 20 is rolled, and do not adversely affect the quality of the product.

As a means to solve such problems,
Publication No. 4366 "The steel ingot gripping device J is disclosed with a gripping part 3 not shown in FIG. 7. This gripping part 3 has a protrusion ( According to this grip part 3, the biting protrusion 5 prevents the punch 4 from biting into the ingot 20 more than necessary.

By the way, when handling the ingot 20 with the ingot gripping tongs l, the ingot 20 is not only simply lifted or suspended in the vertical direction, but also the lifted ingot 20 is placed horizontally, that is, as if it is laid down on its side. There are cases where In such a case, if the gripping part 3 has the above-mentioned configuration, rotational slippage will occur between the protrusion 5 and the ingot 20, so the gripping part 3 can be moved as shown in FIG.
As shown in a) to (c), a tong 1 configured to rotate together with an ingot 20 is provided.

[Problem to be solved by the invention]

However, in the gripping section 3 having the above configuration, the problems shown in FIGS. 8(d) to (
As shown in e), when the tongs I are released from the ingot 20 lying on its side and the tongs I try to grip the next ingot 20' again, the protrusions 5 rotate and change in the vertical direction. Because of this, there is a risk that the anti-slip effect will not be fully exerted.

Therefore, Utility Model Publication No. 57-178078 (Utility Model Publication No. 60-3)
No. 7422) Publication "Punch for Tongs", the protrusion 5 of the grip part 3 is formed in a cross shape with the punch 4 as the center as shown in FIG. 5 is prevented from being oriented vertically.

By the way, in the gripping part 3 mentioned above, the gripping part 3 is certainly 90
Although the direction in which the protrusions 5 are formed does not change even if the ingot 20 is rotated by 90°, the rotation of the ingot 20 is not always 90', and in such a case, the direction of the gripping part 3 (protrusions 5) may change. There is an inconvenience that it is not fixed.

The present invention has been made in view of the above circumstances, and is an ingot gripping device that does not leave deep scratches on the ingot and can reliably perform the initial gripping operation even when the ingot is rotated. The purpose is to provide tongs for use.

[Means to solve the problem]

The tongs for gripping an ingot according to the present invention include a pair of tongs that can be opened and closed freely.
In the ingot gripping tongs, the gripping parts are formed on the inside of the lower ends of a pair of gripping arms, and the gripping parts are connected to an ingot clamping punch, and at least on the outside of the ingot clamping punch. A protrusion oriented substantially horizontally and having a protrusion length smaller than that of the ingot clamping punch, and substantially centered on the axis of the ingot clamping punch. The protrusion is configured to be rotatable, and a return mechanism is provided for directing the protrusion in the horizontal direction when no gripping force is applied to the gripping portion.

[Effect]

The protrusions prevent the ingot clamping punch from digging into the ingot more than necessary.

Since the grip part is rotatable, it can smoothly follow the rotation operation while suspending the ingot.

At this time, once the gripping arm is opened, the direction of the protrusion of the gripping portion automatically returns to the normal direction.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention.

Reference numeral 2 in the figure is a gripping arm of the ingot gripping tongs 1 according to the present invention. Although the same figure shows only one of the pair of gripping arms 2.2, the matters described below also apply to the other gripping arm.

A gripping portion 3 is provided inside the lower end of the gripping arm 2 for actually directly contacting and gripping the ingot 20.

This gripping part 3 is an ingot clamping punch (hereinafter simply "
) 4 and a plurality of protrusions 5, 5, etc. formed parallel to each other. The protrusions 5, 5, . . . extend in a straight line in two directions centering on the punch 4; 4 and 7 are integrally fixed.The mountain shape of the protrusion 5 has a trapezoidal or triangular cross section, and in this embodiment, the protrusion 5
There are 6 books. Further, the protrusion length of these protrusions 5 from the lower end inner surface 2a is set to be slightly smaller than that of the punch 4.

As shown in FIG. 2, the gripping part 3 having the above-mentioned configuration is attached to one end of a rotating shaft 6 provided in the gripping arm 2, and is thereby rotatable together with the rotating shaft 6. There is. A sprocket 7 is provided at the other end of the rotating shaft 6.

Above the grip portion 3 of the grip arm 2, two tension applying devices 8A and 8B are provided so as to be lined up in the width direction of the grip arm 2. One tension applying device 8A will be explained. In this case, this tension applying device 8A is a coil spring IO interposed between two bearing plates 9 and 9'.
and a rod 1 extending from the center of one pressure plate 9 through the coil spring 10 toward the other pressure plate 9' and slidably penetrating the center of the pressure plate 9'.
1, and an adjustment nut 12 screwed onto the base end 11a of the rod 11 and abutted against the outer surface of the pressure bearing plate 9. This tension applying device 8A is fixed to the gripping arm 2 by fixing the bearing pressure plate 9' to the bracket 13 attached to the gripping arm 2 so that the tip end 11b of the rod 11 faces downward. The structure of the other tension applying device 8B is also the same as that of the above-mentioned one tension applying device 8A, but as shown in FIG. They are attached so that their axes are tangent to the sprocket 7.

One end 148 of the chain I4 is connected to the tip 11b of the rod 11 of the one tension applying device 8A. The chain 14 is passed under the sprocket 7, bent upward at the sprocket 7 as if making a U-turn, and the other end 14b is connected to the tip 11b of the rod 11 of the other tension applying device 8B. ing.

In this embodiment, the tension applying devices 8A, 8B chain I
4, the sprocket 7, and the rotating shaft 6 constitute a return mechanism according to the present invention.

Next, the operation of the ingot gripping tongs 1 constructed as described above will be explained.

As shown in FIG. 1, the gripping portion 3 of the tongs 1 is in a steady state when the protrusion 5 is oriented in a direction (horizontal direction) perpendicular to the longitudinal direction of the gripping arm 2.

Although the gripping portion 3 is configured to be freely rotatable, since the tension from both of the tension applying devices 8A8B is applied to the sprocket 7 via the chain 14, it will not rotate freely.

That is, this gripping section 3 has two tension applying devices 8A, 8.
When the elastic forces of both springs 10 of B are balanced, the rotation thereof is restrained. Therefore, in this case, the tensions of both tension applying devices 8A and 8B are adjusted to be equal when the protrusion 5 is in the state shown in FIG.

According to the tongs 1, when the ingot 20 is gripped, the punch 4 bites into the ingot 20 more than necessary due to the protrusions 5, 5.・
..., and deep and thick scratches are not left on the ingot 20. Moreover, the gripping force of the ingot 20 can be increased by the plurality of protrusions 5 coming into contact with or slightly biting into the outer surface of the ingot.

Furthermore, as shown in FIG. 3, when the vertically suspended ingot 20 is laid down horizontally, the gripping part 3 is configured to be rotatable, so that the gripping part 3 is rotated when the ingot 2o rotates. follow,
Smooth operation can be expected without causing slippage between the protrusion 5 and the ingot 20.

In the above case, as the grip portion 3 rotates, the sprocket 7 rotates via the rotation shaft 6.

As a result, chain 1 that has been passed to sprocket 7
4 is sent out in one direction, and pulls the rod II of one tension applying device 8B downward against the elastic force of the spring 10. At this time, the chain 14 is connected to the tension applying device 8A.
As the tension applying device 8A is fed out, the rod 11 of the tension applying device 8A moves upward and the spring 10 is expanded. That is, a force is applied to the gripping portion 3 by one of the tension applying devices 8B to return the gripping portion 3 to its original state. However, when the tongs l are still gripping the ingot 20 as shown in Fig. 3, the gripping force is extremely greater than the force that tries to rotate the gripping part 3, so the gripping part 3 will not rotate. .

After horizontal placement of the ingot 20, when the gripping force of the tongs 1 is released and the gripping arm 2 is opened, the restraining force of the gripping part 3 is released, and the gripping part 3 is moved by the tension from the tension applying device 8B. It rotates in the opposite direction to the direction in which it rotated, and stops at a position where the tensions of both the tension applying device 8A and the other tension applying device 8B are balanced. In other words, the grip portion 3 is automatically returned to its original position with the protrusion 5 facing in the horizontal direction.

Therefore, when the ingot 20 is subsequently suspended vertically, the protrusions 5 are oriented in the horizontal direction as shown in FIG. 1, and the operation of lifting the ingot 20 can be carried out safely and reliably.

Furthermore, according to the above-mentioned tongs l, even if the ingot 20 is
Even if the gripping part 3 is rotated to any angle other than that, the gripping part 3 always automatically returns to the initial state, so that when lifting a new ingot 20, the work can always be performed in the best condition.

Next, FIGS. 4 and 5 show other configuration examples of the return mechanism.

Figure 4 uses a mainspring spring 15, one end 15a of the mainspring spring I5 is fixed to the gripping part 3, and the other end 15b is fixed to the gripping arm 2 side, so that when the gripping part 3 is rotated, the mainspring spring 15 is fixed. 15 is configured to apply a return rotational force to the gripping portion 3. The one in FIG. 5 uses two coil springs like the above embodiment, but two coil springs 16 are arranged on both sides of the grip 3, and both coil springs 16, one end 16a of which is attached directly to the grip portion 3.

The return mechanism according to the present invention is not limited to that shown in the above embodiment (FIG. 1), and may have the above structure, for example. However, if the return mechanism is configured as in the above embodiment, the direction of rotation of the grip portion 3 is not limited. Moreover, since the tension applying devices 8A and 8B are installed at a position away from the grip part 3 that directly contacts the hot ingot, and the tension is transmitted to the grip part 3 via the chain 14, the tension of the spring 10 is increased. Deterioration due to high heat can be prevented.

In the above embodiment, the tension applying devices 8A and 8B are configured using coil springs IO, but they may also be configured using a fluid pressure actuator, an electric motor, or the like.

Further, in the above embodiment, the punch 4 and the protrusion 5 are rotated by the tension applying devices 8A and 8B, but the protrusion 5 may be the only member rotated by the tension applying devices 8A and 8B. .

Furthermore, the tongs 1 according to the present invention can be used not only for gripping slabs used in a rolling process, but also for gripping ingots, which are raw materials for a casting process, or extrusion 1. It can also be applied to tongs for gripping process billets.
Moreover, the same effects as those described above can be achieved.

〔Effect of the invention〕

As explained above, according to the present invention, the protrusions prevent the punch from digging into the ingot more than necessary when the ingot is gripped, thereby preventing deep and large scratches from being left in the slab.
Product quality can be ensured.

Furthermore, when tilting a vertically suspended ingot while it is suspended, the protrusions follow the rotation of the ingot, allowing for smooth operation. Once the gripping force is released from the gripping arm, the protrusion automatically returns to its original position by the return mechanism, regardless of the rotation angle of the ingot, so the next new ingot can be picked up safely and reliably. It can have excellent effects such as being able to be hung.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the ingot gripping tongs according to the present invention. FIG. 1 is a side view showing a part of the gripping arm, FIG. 2 is a front view of FIG. 1, FIG. 3 is a partial side view of the gripping tongs showing a state in which the ingot is rotated while gripping it, FIGS. 4 and 5 are both schematic front views showing other configuration examples of the gripping part, and FIGS. Fig. 9 explains the prior art, Fig. 6 is a front view showing the ingot gripping tongs together with the slab, Fig. 7 is a front view showing the vicinity of the lower end of the gripping arm together with the slab, and Figs. (e) is a side view showing the action of the gripping portion, and FIG. 9 is a front view of the gripping portion. DESCRIPTION OF SYMBOLS 1... Tongs for grasping an ingot, 2... Gripping arm, 3... Gripping part, 4... Punch for holding an ingot, 5...・
... Protrusion, 6 ... Rotating shaft, 7 ...
... Sprocket, 8 A, 8 B ... Tension adding device, 14 ... Chain. (Symbols 6 to 14 above are components of the return mechanism) Applicant Hitachi Co., Ltd. Sky Aluminum Co., Ltd. Figure 4 Figure 5 Factor 6 Figure 7

Claims (1)

[Scope of Claim] Ingot gripping tongs comprising a pair of gripping arms that can be opened and closed, and gripping portions facing each other are formed inside the lower ends of each gripping arm, the gripping portions having an ingot clamping punch; a protrusion provided at least substantially horizontally on the outside of the ingot clamping punch and having a projecting length smaller than that of the ingot clamping punch; The protrusion is configured to be rotatable substantially around the axis of the punch, and includes a return mechanism that directs the protrusion in the horizontal direction when no gripping force is applied to the gripping portion. Tongs for gripping ingots.