JPS6136541Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a synchronous opening/closing mechanism of a tong device, and particularly relates to an improved synchronous opening/closing mechanism of a tong device attached to a lifting tool for lifting and moving steel materials such as blooms. .

[Prior art]

Conventionally, the lifting equipment used to move blooms and other steel materials is equipped with a pair of tong devices on a frame suspended from a crane by a rope, and the tong devices crimp and grip the steel materials from the side. The device is lifted and moved by lifting it up and moving it. Each tong device has a pair of tongs, which are pivotally attached to a tong column attached to a frame, and the upper ends of the tongs are connected to each other by a hydraulic cylinder, and the tongs are opened and closed by their telescoping action to open and close the steel material. It is crimped and gripped.

However, in conventional tong devices, a pair of tongs are independently pivoted to a tong column.
Both were connected to each other by hydraulic cylinders. Therefore, when the hydraulic cylinder is expanded or contracted, both tongs do not move synchronously,
Occasionally, only the other tongs were operated. Such an operation has caused a problem in that the tips of the tongs cannot be accurately brought into contact with the side surface of the bloom to be lifted, and a proper crimping and gripping action cannot be performed. Additionally, if the broom is not located at the center of the tongs device but is eccentric, an eccentric load will be generated on one side of the tongs during crimping and gripping, and the abnormal eccentric load applied to the tip of the tongs may damage the tongs device. There is also a risk that this could happen.

[Purpose of invention]

The present invention focuses on the above-mentioned conventional problems, and allows a pair of tongs of a tong device to be opened and closed synchronously, and even when an eccentric load occurs, steel materials can be easily crimped without being subjected to excessive force. With,
It is an object of the present invention to provide a synchronized opening/closing mechanism for a tong device that can protect the tong device by preventing the load from being transmitted to the tong device when an abnormal eccentric load occurs.

[Structure of the idea]

In order to achieve the above object, the synchronous opening/closing mechanism of the tong device according to the present invention has a pair of tongs pivotally attached to a tong column attached to a frame, and the tongs are connected to each other by a hydraulic cylinder so that the tongs can be opened and closed. A mechanism for opening and closing the tongs of the tong device synchronously, the tong column is equipped with a pair of pinion shafts meshed by gears, a synchronous lever is attached to each pinion shaft via a conical clutch, and the synchronous lever is It connects to a traverse which is slidably fitted to a thrust rod which is pin-coupled to the tongue and which is configured to be spring supported in the direction of sliding relative to the thrust rod.

With the above configuration, the pair of tongs, which are opened and closed by the hydraulic cylinder, move synchronously with each other through gear coupling, and if the object to be gripped is eccentric, the traverse is supported by a spring between the thrust rod and the tongs. The crimping and gripping action can be performed without receiving an unreasonable load, and in addition, by providing a conical clutch, if an abnormal load occurs, the load transmission path is cut and the tong device can be protected. be.

[Example of idea]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a synchronous opening and closing mechanism for a tong device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view of a hanging tool equipped with a tong device having a synchronous opening/closing mechanism according to the present embodiment. The illustrated hanger has a main body frame 10 arranged in a vertical plane. This main body frame 10 is formed into a rectangular frame, and has an upper beam 12.
A pair of lifting pins 14 are provided for the pins 14.
A crane hook lowered from a crane (not shown) is engaged with the handle. Therefore, the hanging device as a whole is lifted and lowered by a crane.

A tong device 20 is attached to the lower beam 16 of the main body frame 10 for crimping and gripping the bloom 18 to be lifted. A pair of tong devices 20 are attached to the lower beam 16, and as shown in FIG. 2, the upper ends of the pair of tongs 22 are connected to each other by a hydraulic cylinder 24, and the lower ends can be opened and closed by the expansion and contraction movements of the tong devices 20. It is something. The pair of tongues 22 are pivotally attached to a tongue column 26 in the middle, and the column 26 is connected to the lower beam 16.
It was installed on. For this reason, the cylinder 24
The tongs 22 open and close each other by the operation of the tongs 22, and the tongs 22 are attached to the side of the broom 18 by the movement in the closing direction.
It can be lifted by pressing the tip of the rod against it and crimping it. In order to determine the crimping position, attach the lower beam 16 corresponding to the mounting position of the tongue column 26.
A positioning post 28 is provided protruding from the lower surface of the broom 18 so as to abut against the upper surface of the bloom 18.

A tong synchronous opening/closing mechanism is attached to the tong device 20 as described above. The specific structure of this synchronous opening/closing mechanism is shown in FIGS. 3 to 6. First, the tongue column 26 is attached to the upper surface of the lower beam 16 in a state perpendicular to it, and is supported by a shaft 30 and stoppers 32 provided on both sides thereof. Tongs 22 are pivotally attached to the tips of tong columns 26 extending on both sides of the lower beam 16 via pins 34, respectively. A pair of pinion shafts 36 are rotatably attached to the tongue column 26 mounted in this manner at approximately the center thereof, and these are meshed with each other by a gear 38 having the same number of teeth on the outer surface of the column 26. They are connected so that rotation can be transmitted.
A synchronizing lever 40 is integrally attached to each of the pair of pinion shafts 36. The synchronizing lever 40 is raised upward and has a bifurcated tip, and a traverse 42 is pin-coupled to the bifurcated portion.

On the other hand, a thrust rod 46 is similarly connected to each of the tongues 22 pivotally mounted on the tongue column 26 via a pin 44 directly above the pivot joint. The slant rod 46 extends toward the center of the tongue column 26, and the traverse rod 46 extends toward the center of the tongue column 26.
It is connected to the synchronizing lever 40 via 2. Here, the traverse 42 is fitted onto the thrust rod 46 so as to be slidable in its axial direction, and is spring supported by a disc spring 48. The disc spring 48 has stopper rings 50 attached to both sides of the traverse 42 and to the thrust rod 46.
is a spring seat, and allows the traverse 42 to slide when a force greater than the set elastic force of the disc spring 48 is applied to the traverse 42. Further, the thrust rod 46 is provided with a pair of flanges 52, and a guide rod 54 passing through the traverse 42 is inserted between the flanges 52.
is installed parallel to the Therefore, the traverse 42 is allowed to slide while being guided and regulated by the guide rod 54.

Further, a conical clutch 56 is provided between the pinion shaft 36 and the synchronizing lever 40 as shown in FIGS.
is installed. The conical clutch 56 is formed by assembling a pair of clutch rings 58 having a wedge-shaped cross section, and these are assembled to a plurality of pinion shafts 36. This conical clutch 56 is held down by push plates 60 on both end faces thereof, and the tightening force can be adjusted by means of tightening bolts 62 that connect both push plates 60 to each other. Therefore, the action of the conical clutch 56, that is, the sliding torque between the pinion shaft 36 and the synchronizing lever 40, can be adjusted by adjusting the set tightening force.

The operation of the tong device including the synchronous opening/closing mechanism configured as described above is as follows. The main body frame 10 is lowered relative to the placed bloom 18 until the positioning post 28 comes into contact with the upper surface of the bloom 18. When the hydraulic cylinder 24 is actuated after the positioning post 28 hits the broom 18, the tongs 22, which are in the open leg state in advance, move to the broom 1.
It is closed towards the side of 8. At this time, the pair of tongs 22 move synchronously. That is, each thrust rod 46 is pulled by the action of the tongue 22, and this action causes the synchronizing lever 40 to rotate via the traverse 42 which is supported elastically by the disc spring 48. The synchronizing levers 40 connected to each of the tongs 22 are mutually connected by gears 38 attached to their ends, so that the amount of movement of each of the tongs 22 in the leg-closing direction is the same. In this way, the pair of tongs 22 are synchronously interlocked to press the bloom 18 and lift it up.

Here, when the positioning post 28 is not located on the center line of the bloom 18 and is in an eccentric state,
One of the tongs 22 is activated by the operation of the hydraulic cylinder 24.
The tip of the broom 18 comes into contact with one side of the broom 18 first. If the hydraulic cylinder 24 is further operated in such a state, an eccentric load is applied to the tong device. At this time, a tensile force is applied to the thrust rod 46 connected to the other tongue 22. This acting force attempts to rotate the synchronous lever 40, which is activated by the meshing of the gear 38.
The eccentric load is absorbed by the presence of the disc spring 48 and does not affect the synchronization mechanism.

Furthermore, if an abnormal load is applied to one of the tongues 22 in an eccentric state, the force that presses the traverse 42 via the disc spring 48 will be absorbed by the synchronization lever 4, although the disc spring 48 will not be able to absorb it.
It produces a rotational torque of 0. If such rotational torque is abnormally large, it will damage the meshing gear 38, but the synchronization lever 40 and pinion shaft 3 will be damaged.
Since a conical clutch 56 is provided between the
If the rotational torque becomes larger than the set friction torque, slippage occurs, and no abnormal rotational torque is transmitted to the gear 38.

As described above, according to the synchronous opening/closing mechanism according to this embodiment, the pair of tongues 22 can be caused to move synchronously with each other by employing a simple gear mechanism. Further, since the spring support means consisting of the disc spring 48 is provided, even if the broom 18 is eccentric, no unreasonable force is applied to the tip of the tongs 22, and the crimp grip can be easily performed. A conical clutch 56 is interposed between the synchronizing lever 40 and the pinion shaft 36 to which the gear 38 is attached, and the tongue 22
Even if an abnormal load is applied to the tip of the tong device, it is possible to prevent the conical clutch 56 from slipping and damage to the tong device when this abnormal load occurs.

[Effect of idea]

As explained above, according to the synchronized opening/closing mechanism of the tong device according to the present invention, a pair of tongs can be opened/closed with the same amount of movement using a simple gear mechanism. This eliminates the need for excessive loads to be applied to the tip and prevents damage due to the friction clutch action in the event of an abnormal load.

[Brief explanation of the drawing]

Fig. 1 is a front view of a hanging tool equipped with a tong device, Fig. 2 is a side view of the tong device, Fig. 3 is a sectional view of the tong column portion, Fig. 4 is a plan view of the same, and Fig. 5 is a side view of the tong device. 6 is an enlarged sectional view of the thrust rod, FIG. 7 is a sectional view of the synchronizing lever in an installed state, and FIG. 8 is a sectional view of the conical clutch. 10...Main frame, 16...Lower beam, 1
8... Bloom, 20... Tong device, 22...
Tong, 24...Hydraulic cylinder, 26...Tong column, 36...Pinion shaft, 38...Gear, 4
0...Synchronization lever, 42...Traverse, 46...
...Thrust rod, 48...Disc spring, 56...Conical clutch.

Claims (1)

[Scope of utility model registration request] A pair of tongs are pivotally attached to a tong column attached to a frame, and the tongs are connected to each other by a hydraulic cylinder to open and close the tongs. A pair of meshed pinion shafts are provided, each pinion shaft having a synchronizing lever attached thereto via a conical clutch, the synchronizing lever being coupled to a traverse slidably fitted to a thrust rod which is pin-coupled to the tongue. A synchronous opening/closing mechanism for a tong device, characterized in that the traverse is supported by a spring in the sliding direction with respect to the thrust rod.