JPH0324551Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hoist for long steel bars used when transporting long steel bars such as round steel, square steel, and pipes by crane.

[Conventional technology]

Traditionally, slinging tools such as wire ropes and chains have been used when transporting long steel bars with cranes, but these methods have been used because the slinging work requires a lot of labor, personnel, and danger. There is a need for the development of a new hanging device that can solve this problem.

As one of the hanging tools that met this demand, JP-A-58-
A hanging tool as shown in Publication No. 188231 has been proposed. In this lifting device, a trolley is movably attached to both longitudinal sides of a beam that is supported horizontally on a crane hook, and a pair of arms that can be opened and closed in a direction perpendicular to these trolleys are suspended from each trolley. In between is a spring that expands the arm, a stopper that uses this spring force to prevent the arm from expanding more than necessary, and a support member that is inserted into the lower surface of the long steel bar placed horizontally to support it. Barrel chains are strung across each. This hanging device is designed so that the chain is kept loose in a U-shape at all times, and is inserted into the gap between the stacked steel bars via a spacer by sliding the top of the lower stack of steel bars.

[Problem that the invention attempts to solve]

However, in the case of the above-mentioned hanging equipment, since the chain is loose, when it is inserted into the bottom surface of the steel bar, it tends to get caught on the steel bar or cable ties in the lower stack, making it difficult to insert it smoothly. Ta.

In addition, the chain can be inserted into the bottom surface of the bar material,
Alternatively, it is necessary to support the beam at a predetermined height above the steel bar when it is detached, but in this case, there is a person who monitors the bar and signals to the crane operator that it has reached a predetermined height. It was necessary.

Furthermore, if there is no clearance on the underside of the steel bar to insert the chain, it can no longer be used.

[Purpose of invention]

The present invention was made to solve the problems of the prior art described above, and its purpose is to easily insert the support member into a small gap between the steel bars, and also to perform the so-called splitting operation. Moreover, it is an object of the present invention to provide a hanging tool for a steel bar that can reliably support a main beam at a predetermined height above the bar without requiring a signal person.

[Summary of the idea]

In order to achieve the above object, the present invention uses a spring to spread out a pair of arms that can be opened and closed, and tensions the support member that is stretched over the ends of the arms in a horizontal straight line. The support member can be easily inserted into a small gap between the steel bars. A splitting work hook is suspended from the telescopic auxiliary beam on which the above-mentioned arm is swingably suspended, and the arm can be moved so as not to get in the way of the splitting work, and the splitting work hook can be used to directly cut the steel bar. It can also be gripped by inserting claws into the underside of it. In addition, by providing the main beam with support legs that are placed on the steel bar, the main beam can be supported at a desired height from above the bar without the need for a signal person, thereby saving labor. be.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the hoist made of long steel material includes a main beam 3 that is supported horizontally on a crane hook 1 via a hoisting wire 2. Main beam 3 has an inverted U cross section.
It has a shape in which flange portions 4 facing each other are continuous in the longitudinal direction at the lower portions of both side walls. Auxiliary beams 5 are inserted into both ends of the main beam 3.
It is supported so as to be movable in the longitudinal direction via wheels (not shown) that roll on the inner upper wall and the flange portion 4 . As a means for extending and contracting both auxiliary beams 5 from both ends of the main beam 3, a screw rod 6 along the longitudinal direction is mounted on the upper wall of the main beam 3 with a bearing 7.
Auxiliary beams 5 are connected via nuts 8 to both sides of the screw rod 6, which is rotatably supported via nuts 8 and has reverse threads on both sides with the longitudinal center as a boundary. screw rod 6
A motor 9 is connected to one end of the auxiliary beam 5 via a chain 10, and a limit switch 11 for detecting the expansion/contraction limit position of the auxiliary beam 5 is connected to the other end of the auxiliary beam 5 via a chain 12. Note that the means for expanding and contracting the auxiliary beam 5 may be other means such as a cylinder. As shown in FIGS. 2 and 3, a joint member 40 that can rotate in a direction perpendicular to the auxiliary beam 5 is attached to a bracket 13 attached to both sides of a portion integrally extending below the tip of the auxiliary beam 5. One end of a pair of arms 14 is attached to these joint members 40 via a pin 41 so as to be rotatable in the direction of expansion and contraction of the auxiliary beam 5.
4 can swing in the direction of expansion and contraction of the auxiliary beam 5 while being suspended below, and can also open and close in the direction orthogonal to the auxiliary beam 5. Since the extending portion of the auxiliary beam 5 can move along the opening on the lower surface of the main beam 3, the arm 14 can move inward from both ends of the main beam 3. A guide cylinder 42 is provided at the tip of the auxiliary beam 5.
A splitting work hook 43 is provided so as to be movable up and down. This splitting hook 43 has a claw 45 at the lower end of a support rod 44 inserted into the guide cylinder 42 for supporting the lower surface of the bar 23. The support rod 44 is fixed to the guide cylinder 42 with a pin 46, and a plurality of pin holes (not shown) are formed in the support rod 44 so that its length can be adjusted. When using the splitting hook 43, the guide cylinder 42 and the arm 14 are pinned together as shown in FIG. A stopper 47 for fixing is attached.

As shown in FIG. 3, a bracket 18 having rods 17 is rotatably attached to the intermediate portion of the arm 14 with a pin 19. The rod 17 is inserted movably, and a stopper 21 is formed at the tip of the rod 17 to prevent it from coming off the box 20. Therefore, the arm 14 can be opened and closed within a certain range from the position where the stoppers 21 abut each other to the position where the arm 14 abuts the side wall of the box body 20. Further, a coil spring 22 is attached to each rod 17 between the box body 20 and the bracket 18, and the pair of arms 14 are biased to expand so as to assume a maximum opening degree.

A wire rope 2 with a stand is attached to the tip of the arm 14 as a flexible support member for supporting the lower surface of the long steel bar 23 placed horizontally.
4 is suspended under tension by the force of the spring 22.

As a means for adjusting the length of the wire rope 24, as shown in FIGS. 3 and 4, a bolt 26 having a fixing part 25 for fixing the end of the wire rope 24 is attached to the arm 14 by a mounting seat 27 and a nut 28. The end of the wire 24 is attached to the arm 14 through the
It is fixed to the fixing part 25 via a pulley 29 attached to the tip of the. Therefore, by adjusting the movement of the bolt 26 by rotating the nut 28, the length of the wire rope 24 stretched between the pulleys 29 of the arm 14 or the opening degree of the arm 14 can be adjusted in the horizontal position of the bar 23. It can be adjusted to suit.

On the other hand, a height-adjustable support leg 30 is provided on the lower surface of the center of the main beam 3 to support the main beam 3 at a predetermined height above the steel bar 23. By positioning and fixing the wire rope 24 to the lower surface of the bar 23, the wire rope 24 can be easily inserted into or removed from the lower surface of the bar 23. The support leg 30 includes a script body 31 hanging from the lower surface of the main beam 3, and a script body 31 that is suspended from the lower surface of the main beam 3.
It consists of a leg plate 33 supported at the lower end via a guide rod 32 so as to be able to rise and fall freely, and a non-slip member 34 made of hard rubber or the like is attached to the lower surface of the leg plate 33. Also, a motor 3 is mounted on the bottom of the main beam 3.
A jack 36 driven by the main beam 3 is attached, and the tip of the jack 36 is connected to the leg plate 34, so that the height of the main beam 3 can be adjusted by raising and lowering the leg plate 34.
In FIG. 1, 37 is a power distribution box for supplying power to the motor 9 and the like.

Next, we will discuss the effect.

When transporting the stacked steel bars 23 via the cross members 38, first the auxiliary beam 5 is extended by rotating the screw rod 6, and the hoist according to the present invention is placed on the bar bars 23 by operating a crane. Lower the support leg 30 so that it rests on the support leg 30. The height of the main beam 3 is adjusted to a height at which the wire rope 24 can fit into the gap 39 formed between the upper and lower steel bars 23 by raising and lowering the leg plate 33 of the support leg 30 using a jack 36. Once the height is adjusted in this way, the hanging tool can always be accurately positioned at a predetermined height above the bar 23 without the need for a signal person, and the engagement of the wire rope 24 can be The detachment operation can be performed smoothly.

The hanging tool is attached to the bar 23 until the hanging wire 24 becomes slightly loosened.
Once lowered, the auxiliary beam 5 is contracted and the wire rope 24 is inserted into the gap 39. The wire rope 24 is stretched around the tip of the arm 14 under tension and is formed in a substantially straight line horizontally.
It can be easily inserted even in a small gap 39,
So-called sling work can be done easily.

Next, the hoist is raised by crane operation, the lower surface of the bar 23 is supported by the wire rope 24, and the bar 23 is transported to the target location. Due to the load of the steel bar 23 applied to the wire rope 24, the arm 14 is
2 is compressed and closed, and the wire rope 24 is loosened into a U shape, so that the wire rope 24 is compressed and closed.
It has a shape that wraps around the steel bar 23, and the bar 23 can be reliably supported and transported.

When lowering the steel bar 23 onto the horizontal member 38 at the destination location, placing the support leg 30 on the bar 23 and resting the load of the lifting tool will remove the load of the bar 23 from the wire rope 24 and arm the arm. 14 is expanded by the force of the spring 22 and tensions the wire rope 24.
By stretching the auxiliary beam 5, the wire rope 24 can be easily removed from the gap 39 on the lower surface of the bar 23.

If the gap 39 formed on the lower surface of the steel bar 23 is extremely small or almost non-existent, slinging work will be difficult. Lower and extend the splitting work hook 43 and attach the pin 4.
6 to a suitable length, and use the splitting hook 43 to perform the splitting work.

Similar to the above sling work, the auxiliary beam 5 is extended, and the hoist is attached to the bar 2 by crane operation.
3 so that the supporting legs 30 rest on the bar 23, and by contracting the auxiliary beam 5, the claw 45 of the splitting hook 43 is inserted into the lower surface of the bar 23.

As a result, the bar 23 can be supported and transported to the destination by crane operation, and when the bar 23 is to be released, the auxiliary beam 5 is extended and the claw 45 of the splitting hook 43 is attached to the bottom surface of the bar 23. You can separate it from.

In addition, in the embodiment, the wire rope 2 is used as a support member.
4 was used, but a chain may also be used. Further, as the length adjusting means for the wire rope 24, an automatic adjusting device such as a jack may be used. Further, instead of the electric jack 36 for adjusting the height of the support leg 30, a manual jack may be used. Also,
The swinging of the arm 14 and the raising and lowering of the splitting hook 43 may be performed automatically.

[Effects of the invention] (1) The auxiliary beam can move over a wide range from the outside to the inside of the main beam, and can handle bar steel of any size, and the spring force can evenly move the arm from side to side. The support member can be stretched horizontally in a straight line, and can be easily inserted into small gaps between stacked steel bars, and the opening of the arm can be adjusted to the horizontal position of the steel bars. You can adjust it accordingly.

(2) Since the main beam is provided with support legs, the main beam can be reliably supported at a predetermined height above the steel bar without the need for a signal person. Insertion and removal can be performed quickly and easily.

(3) In addition to sling work, it can also be used for splitting work, making it highly versatile, but when doing splitting work, it is recommended to swing the arm that gets in the way outside of the splitting work hook and secure it with a stopper. You can easily do the cutting work.

[Brief explanation of drawings]

FIG. 1 is a side view of a hanging tool for a long steel material according to the present invention;
Fig. 2 is a front view of the device, Fig. 3 is a partially cutaway enlarged view of the arm portion of the device, Fig. 4 is a perspective view of the device that fixes the support member to the arm, and Fig. 5 is a hook for splitting work. FIG. 3 is a partial side view showing the state of use. In the diagram, 1 is the crane hook, 3 is the main beam, and 5
is an auxiliary beam, 14 is an arm, 22 is a spring, 23
24 is a support member; 30 is a support leg; 43
is a hook for splitting work. It is.

Claims (1)

[Scope of utility model registration request] An auxiliary beam is fitted to both ends of the main beam, which has an inverted U-shaped cross section and is supported horizontally on a crane hook, and has flanges that face each other in the lower part of both sides in the longitudinal direction, so that the auxiliary beam can move freely along the longitudinal direction. equipped,
A pair of arms are pivotally supported at the bottom of each auxiliary beam so that they can be opened and closed in a direction perpendicular to the auxiliary beam, and swingable in the direction of movement of the auxiliary beam. A splitting hook is provided that can be raised and lowered, a stopper is provided on the guide cylinder body to detachably fix the arm in a state in which the arm is swung outward from the splitting hook, and a spring is used to spread the arms between the arms. At the same time, a flexible support member for supporting the lower surface of a horizontally placed long steel bar is stretched between the ends of the arms in a tensioned state and its length can be freely adjusted. A hanging tool for a bar steel material, characterized in that a height-adjustable support leg is provided at the center of the lower surface of the bar material to be placed on the bar bar material.