JP2792751B2 - Slab tongs with non-power operated safety hackers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab tong which is a hanging tool used for transferring a slab (steel plate) in a steel mill or the like. The present invention relates to a slab tong suitable for such an operation.

[0002]

2. Description of the Related Art Conventionally, when transferring a slab manufactured by, for example, continuous casting, it is sometimes necessary to suspend the slab so that a claw cannot be hung on a bottom surface. Slab tongs are used in which a slab tongue is held by a gripper and lifted by the gripping force.

In such a slab tong, for example, if the slab or the like hits a peripheral facility or a load during transportation, the gripping force is instantaneously loosened and the slab of several to several tens t falls. In order to avoid serious damage to the equipment below, to prevent this, a hook (generally called a safety hacker) that hooks on the bottom of the slab after hanging is provided to secure the suspended state during transportation. Many attempts have been made.

In the slab tongs described above, it is not easy to provide a device for hooking a nail on the bottom surface of the slab so that the slab may be lifted while the slab is placed directly on the floor. For this purpose, for example, a slab tong provided with an electric drive type safety hacker in which the slab is once gripped by the gripping claws and lifted, and in this state the claws hanging on the bottom are inserted into the bottom of the slab from the sides by an electric device. Many proposals have been made (e.g.
-57352, JP-A-48-24446, JP-A-Showa 4
No. 8-18954, Japanese Patent Publication No. 55-29914, etc.).

Further, a tongue suspension arm and a hacker that follows the movement of the suspension arm are provided. A slab tongue of a type provided with a non-power-operated type safety hacker in which the lower end pawl of the slab is inserted into the bottom surface of the slab from the side has been proposed (Japanese Patent Application Laid-Open No. Sho 48)
-24445).

[0006]

However, the slab tong provided with the above-mentioned electric drive type safety hacker,
If a hacker receives a thrust force by engaging with a floor or the like, there is a difficulty that the driving mechanism is easily damaged by the thrust force. There is a problem that the wiring causes the whole tongue to be complicated and costly.

[0007] The slab tong provided with the non-powered type safety hacker does not have the drawbacks of the power type, such as complicated mechanism and high cost.
As in the tongs proposed in Japanese Patent Application Laid-Open No. 48-24445,
Because the hacker's attitude is controlled by following the opening and closing movement of the hanging arm that holds the slab, the movement of the hacker is uniquely dependent on the shape of the guide groove provided on the hanging arm or the hacker. However, there is a drawback that the width dimension of a slab that can be targeted by one tongue is extremely limited, and there is a drawback that the versatility is inferior to a power-type slab tongue that has few restrictions on the application target.

The present invention has been made in consideration of the problems of the conventional slab tongs, has no problem when a power-type safety hacker is provided, and solves the disadvantages of the conventional non-power-operated tongs. The purpose of the present invention is to provide a non-powered operation type slab tong excellent in performance.

Another object of the present invention is to stably store the hacker in the retracted position when it is not suspended, thereby preventing the hacker from being damaged by collision with peripheral equipment and the like, An object of the present invention is to provide a slab tong which does not cause erroneous operation or the like and is excellent in safety.

[0010]

In order to achieve the above object, the inventor of the present invention has provided a tongue main body having a pair of hanging arms for holding a slab by holding the slab from both side end faces, and a tongue body having the pair of hanging arms. A hacker arm having a claw that is pivotally supported by the lower end of each suspension arm inside the gripping position and that wraps around the slab bottom surface from the pivot point to the outside of the slab side end and a pulley provided on the tongue main body The hacker arm has a weight connected to the wire with the hacker arm, and moves the hacker arm, which is positioned so that the claw hangs on the bottom surface of the slab due to the downward movement of the weight, around the pivot point until the claw retreats to the outside of the slab. A slab tong provided with pulling means for rotating the puller against its own weight and pulling it up, and locking means for locking the hacker arm raised to the retracted position at the position and releasing the lock when the slab is hung, Pull The lifting means is provided so that the downward movement of the weight is regulated by the hanging slab, and the locking means projects from the slab gripping surface of the hanging arm and is pressed by the slab side end face when gripping the slab of the hanging arm. The present invention has been completed in the form of a slab tong provided with a non-power-operated safety hacker, in which a pressing member is provided and the lock is released by the operation of the pressed member.

In the slab tong of the present invention, the operation of the hacker arm is performed without power. On the other hand, the opening and closing of the suspension arm for holding and holding the slab by pressing and holding may be basically performed by a pantograph mechanical link mechanism or a power drive mechanism such as a screw screw drive mechanism. The mechanism is particularly preferable in that the whole tongue can be of a non-powered type.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

FIGS. 3 and 4 show the outline of the overall structure of a slab tong to which the present invention is applied. In these figures, reference numeral 1 denotes a horizontal beam, and a main winding wire ( (Not shown), a pantograph-type link mechanism 3, 3 is hung downward from each end, and an intermediate beam 4 is provided between these link mechanisms 3, 3. Has been erected. Between the lower center of the horizontal beam 1 and the center of the intermediate beam 4, the two beams 1 and 4 are close to each other when the slab is not suspended (ie, the pantograph-type link mechanism 3 is folded). ) Is provided with a lock mechanism 5 for locking. The lock mechanism 5 is provided in such a structure that the lock mechanism 5 is unlocked when the slab is hung so that the link mechanisms 3 and 3 can be opened and closed. Since there is no direct relationship and it suffices to be the same as a known one, its description is omitted here.

Reference numeral 6 denotes a horizontal stay fixedly mounted on each of the upper surfaces of both ends of the intermediate beam 4 so as to form a horizontal plane at right angles to the horizontal beam.
The upper ends of 1, 31 are pivots (the pivot pins are indicated by reference numeral 311)
The intermediate portion of the third-stage links 33 of the pantograph-type link mechanism 3 is a pivot (a pivot pin is denoted by reference numeral 33).
1, 331). Reference numeral 32 denotes a second-stage link of the pantograph-type link mechanism 3, 321 denotes a pivot pin at an intersection thereof, 312 denotes a pivot pin between the first-stage link 31 and the second-stage link 32, and 322. Indicates pivot pins of the second-stage link 32 and the third-stage link 33, respectively.

Reference numerals 7 and 7 denote a pair of gripping claws pivotally connected to the lower end of the third-stage link 33 (hereinafter simply referred to as a link 33) (a pivot pin is indicated by reference numeral 71). , And a link 8, which is pivotally mounted between the horizontal stays 6,
8 (the pivot pins are indicated by reference numerals 81 and 82) to form a parallelogram link motion, always maintain the posture shown in FIG.
The opening and closing movement of the link 33 allows the slab 9 to expand and contract in a substantially horizontal direction. Note that 7
Reference numerals 2 and 72 denote pads which are assembled inside the lower ends of the gripping claws and engage with the side end surfaces of the slab. These form a suspension arm for clamping and holding the slab.

Numerals 10 and 10 denote hacker arms assembled to the gripping claws 7, and FIG. 3 shows a state where the hacker arms are lowered from the retracted position and hung on the slab 9 (actually, the gripping claws 7 Can be prevented from falling).

Next, the mechanism around the gripper 7 and the hacker arm 10 will be described in detail with reference to FIGS.

In the present embodiment, the hacker arms 10 and 10 have a substantially inverted L-shape as shown in FIG. 1 and are gripped by the pivot pins 82 at opposing inner ends of the horizontal arms. It is pivotally attached to the nail 7. The roller 12 is rotatably assembled to the pivot pin 82,
This prevents the gripping claw from coming into contact with the upper surface of the slab. Also this hacker arm 1
At the lower end of the L-shaped bent leg, a hook 101 is provided inwardly and hooked on the bottom surface of the slab, and a rotatable rolling roller 102 is assembled. Hacker arm 10
When the slab 9 is lowered from the retracted position, the rolling rollers 102 hit the floor surface, and the slab 9 is rolled by the rolling rollers until the hook 101 can be hooked on the bottom surface of the slab as the slab 9 is gripped and lifted by the gripping claws 7. It has become.

FIG. 1 shows a state in which the gripping claws 7 have not yet been gripped and engaged with the slab 9, but for convenience, the hacker arm 10 on the left side of the figure is under its own weight until it is put on the slab. A down position is shown, and a stopper (not shown) is provided so as to stop in this position and prevent further rotation of its own weight.

A wire 11 is further connected to the connecting portion 103 of the L-shaped bent portion on the hacker arm 10 configured as described above, and the wire 11 is connected to a pulley 12 provided on the horizontal stay 6. , 13 are connected to the weight 14 so that a pulling force acts on the hacker arm 10. That is, when the weight of the weight 14 acts on the hacker arm 10 via the wire 11, the hacker arm 10 is pulled up to the retracted posture shown on the right side of FIG. 1 and stopped by a stopper (not shown). I have.

Further, in this embodiment, there is provided means for locking the hacker arm 10 so as to maintain a stable posture in the retracted position even if the wire 11 is slackened. That is, this will be described with reference to the right gripping claw 7 in FIG.
The lock blade 1 is fixed to the fixed blade 15 fixed to the gripping claws.
6 is pivotally mounted, and this is biased by a lock spring 17 in the clockwise direction in the figure, and a knob 162 provided on the lock blade is engaged with the fixed blade 15 to stop. A notch 104 provided near the connecting portion 103 of the hacker arm 10 with respect to the lock blade 16 in this state.
However, with the lifting, the locking portion 1 of the lock blade 16
Since the notch 104 of the hacker arm 10 that has been pulled up fits into the stopper 163, the hacker arm 10 descends by its own weight even if the lifting force from the wire 11 is released. Is restricted, and the vehicle stops at the retreat position. The lock by the lock blade 16 is such that the lower end hook 164 of the lock blade is projected from the pad of the gripping claw 7 to the slab side by a predetermined length, and when the slab 9 is gripped, the lower end hook 164 is pressed by the slab. Lock spring 1
7, the stopper 163 is removed from the notch 104 of the hacker arm 10 so that the lock can be released.

Next, a mechanism related to the weight 14 that applies a pulling force to the hacker arm 10 via the wire 11 will be described. A lifting force adjusting box 18 having a vertical dimension and having a predetermined degree and capable of resting on the suspended slab is assembled at a position inside the horizontal stay 6 and extends from the horizontal stay 6 side. The arm 14 (not shown) is provided so that the upward movement and the downward movement of the weight 14 can be regulated. That is, in the free state where the slab is not suspended, the lifting force adjusting box 18 is lowered to the lowermost position with respect to the intermediate beam 4, so that the weight of the weight transmits the lifting force to the hacker arm 10 via the wire. When the box 18 rests on the slab for slab suspension, the box 18
(See FIG. 1), whereby the lifting force on the hacker arm 10 is released. Therefore, if the lock of the hacker arm locked at the evacuation position is released as described above when the slab is hung, the hacker arm 10 can descend downward to a position where the hacker arm hangs on the bottom surface of the slab 9 by its own weight.

After transferring the suspended slab 9 to a predetermined position, the slab is released and the tongs are lifted, so that the box 18 is lowered with respect to the intermediate beam 4.
Therefore, the hacker arm 10 is pulled up by the weight via the wire 11, and the hacker arm is automatically pulled up to the retracted position and locked.

Since the box 18 is placed on the slab, the rolling roller 181 is provided below the box 18 in this embodiment.
By assembling, the slab is prevented from being damaged.

As described above, the slab tongue of the present embodiment has a link mechanism of a suspension arm for gripping and lifting the slab (including the gripping claws assembled to the lower end of the link 33 in the above description), and the dropping of the suspended slab. Various mechanisms such as a hacker arm and a related lock mechanism that constitute a safety hacker mechanism for prevention can function independently of each other without being restricted by movement. The suspension arm link mechanism can be designed to suspend slabs of various sizes without being restricted by the safety hacker mechanism, and has the advantage that it can be actually used.In each of these cases, the safety hacker mechanism is used. It has the effect that it can function reliably.

Further, since the safety hacker mechanism is operated only by a completely mechanical linking operation, equipment for introducing electric power such as an electric type is not required. In addition, since the safety hacker functions and the hacker arm is automatically stored in the retracted position after the transfer, there is an excellent advantage that the operator is not burdened at all.

Further, in a state where the hacker arm is hung on the slab, the pivot point 82 of the hacker arm is located inside the side end of the slab. Therefore, even if the slab is dropped, there is no possibility that the slab will come off, and there is an advantage that the safety is high.

The present invention is not limited to the configuration of the embodiment described above, and it goes without saying that the present invention can be implemented in various modified forms. For example, in the above embodiment, the pair of wires 11, 11 are connected to one weight 14, but it is also preferable to use separate weights. If the weights are different, the slackness of the wire will also occur if the slabs are misaligned when gripping the slabs stacked on top of each other and the way down the hackers' arms is not right-left. This is advantageous in that no displacement of the weight or the weight is caused. Further, it is also possible to adopt a configuration in which a spring is connected in the middle of the wire to prevent the wire from sagging, or a wire drawing type reel is provided in the weight portion.

[0029]

As described above, the slab tongue of the present invention has no problem of the possibility of damage to the drive mechanism which is a drawback when a power type safety hacker is provided, and furthermore, the conventional slab tongue has no power. This eliminates the drawback of the tongue, which limits the application target, and has the effect of providing a slab tong with excellent versatility.

In the slab tong of the present invention, since the hacker is stably stored in the retracted position when the hacker is not hung, the hackers are hung in an unstable manner, thereby abutting and damaging peripheral equipment and the like. And the hacker arm automatically enters the engagement position as the slab is suspended,
In addition, since it is easy to escape to the side of the slab, it does not need to perform the operation of removing the hacker automatically when it is removed, it automatically comes off, so there is no problem such as erroneous operation by the operator, and it is said to be excellent in safety There is also an effect.

Furthermore, in the state where the hacker is hung on the slab, since the hacker's pivot point is located inside the side end of the slab, its own weight always acts in the hanging direction. There is no danger of falling off even if a falling situation occurs, and there is an effect that the safety is high.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of a slab tong according to an embodiment of the present invention.

FIG. 2 is a diagram showing a side view of FIG. 1;

FIG. 3 is a front view showing the general outline of the slab tong shown in FIG. 1;

FIG. 4 is a diagram showing a side view of FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Horizontal beam, 3 ... Pantograph type link mechanism, 4 ... Intermediate beam, 6 ... Horizontal stay, 7 ...
Gripping claw, 9 ... slab, 10 ... hacker arm, 11
... Wire, 12, 13 ... Pulley, 14 ...
Weight, 15: fixed blade, 16: lock blade, 17: lock spring, 18: pull-up force adjusting box.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-48-24445 (JP, A) JP-A-48-18954 (JP, A) JP-A-48-24446 (JP, A) JP-A 48-48 57352 (JP, A) Japanese Utility Model Showa 57-41889 (JP, U) Japanese Patent Publication No. 55-29914 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B66C 1/00-1 / 68

Claims (4)

(57) [Claims] 1. A tongue main body having a pair of suspension arms for clamping and holding a slab from both side end surfaces, and a tongue main body which is pivotally supported by a lower end of each suspension arm inside the gripping position of the suspension arm. A hacker arm having a claw that wraps around the slab bottom surface from the pivot point around the outside of the slab side end, and a weight that is wire-connected to the hacker arm via a pulley provided on the tongue main body, is provided. Pull-up means for pulling up the hacker arm, which is positioned so that the claw hangs on the bottom surface of the slab due to the downward movement, by rotating the hacker arm against its own weight around the pivot point until the claw retreats to the outside of the slab, and pulling up to the retracted position A lock means for locking the hacker arm at this position and releasing the lock when the slab is hung, wherein the lifting means is configured to restrict downward movement of the weight by the hung slab. Set in The locking means is provided with a pressed member protruding from the slab gripping surface of the suspension arm and pressed by the slab side end face when the suspension arm grips the slab, and the lock is released by the operation of the pressed member. A slab tong equipped with a non-power-operated safety hacker. 2. The slab tong according to claim 1, wherein a roller for rolling on a ground contact surface is provided at a lower end of the hacker arm. 3. The hacker arm according to claim 1, wherein the pair of hacker arms provided so as to sandwich both side ends of the slab are connected to separate weights via wires. A slab tong with a non-power-operated safety hacker characterized by: 4. The slab tong according to claim 1, wherein the suspension arm forms a part of a pantograph opening / closing mechanical link mechanism.