JP2006069688A - Carrier suspender for crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carrier suspender for a crane capable of preventing growth of a gutter between a hanger part of the carrier suspender for the crane and a crane hook under a simple method and easily carrying out connection and disconnetion of the hanger part and the crane hook only by operation of the crane. <P>SOLUTION: The hanger part of the carrier suspender for the crane has a pair of projection parts to make contact with both side parts of the head end side of a hook part of the crane hook in suspending the carrier suspender by the crane hook. It is favorable to devise it possible free to adjust a setting position of a pair of the projection parts. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a crane transport hanger, and more particularly, to a crane transport hanger that eliminates rattling with a crane hook in a handle portion of the crane transport hanger.

  In various factories and at unloading and loading sites at quays, it is common to carry heavy objects with cranes. In this case, it is common to carry the article by fixing the article to be transported and connecting the hook of the crane to the suspension part of the conveyor so as to be detachable.

  When connecting the suspension part of the transporting device and the crane hook, it is necessary to be able to attach and detach the suspension part and the crane hook only by operating the crane. Generally, it is configured to be hooked and suspended.

  In this way, when a crane hook is hooked on a hanging part of a hanging tool that conveys a conveyed item and the conveyed item is conveyed in a suspended state, the conveyed item causes a twisting motion due to a reaction force when the crane turns. There was a problem. When this twisting motion occurs, handling of the transported material may fail, and in order to prevent the handling failure, the handling must be interrupted until the twisting motion of the transported material is attenuated, and the transport efficiency is remarkably increased. It was decreasing.

With respect to such a problem, Patent Document 1 (Japanese Patent Laid-Open No. 8-319084) can attenuate the twisting motion generated when the transported object is turned in a short time, and can stably maintain the posture of the transported object. A turning attitude control method is described.
JP-A-8-319084

  By using the method described in Patent Document 1 described above, it is possible to suppress the torsional motion during the turning of the transported object. However, when the crane hook is hooked to the suspension part of the lifting tool for transporting the transported object as described above, the backlash between the suspension part and the crane hook is not good when the crane is turned during heavy object transportation. The occurrence of (play) is unavoidable, and the positioning accuracy of the swivel angle of the conveyed product may be insufficient.

  It is considered that the backlash between the suspension part and the crane hook is caused by a small frictional resistance between a steel transporting suspension, which is a general material, and a crane hook, which is a forged product.

  Therefore, a method has been tried to reduce the play by sandwiching a plate-like rubber, for example, with a large frictional resistance between the suspension part of the transporting suspension and the crane hook. The backlash between the part and the crane hook cannot be completely eliminated, and it has been difficult to sufficiently secure the positioning accuracy of the swivel angle of the conveyed product. Furthermore, in the said method, the plate-shaped rubber had to be set every time the carrying suspension and the crane hook were attached / detached, and the work was complicated.

  Although a method of mechanically fixing the suspension part and the crane hook is also conceivable, the structure becomes complicated and the equipment cost increases, and it takes time to attach and detach the suspension part and the crane hook. There was a problem of making it worse.

  Therefore, the present invention prevents rattling between the crane suspension hook and the crane hook by a simple method, and the crane portion can be attached and detached only by the operation of the crane. It is an object of the present invention to provide a crane lifting device that can be easily performed.

In order to achieve the above object, the present invention has the following features.
[1] In the suspension part of the crane lifting device,
A crane-carrying lifting device, comprising a pair of protrusions that come into contact with both side portions of the crane hook on the distal end side of the crane hook when the conveying device is suspended by a crane hook.
[2] The crane lifting device according to [1], wherein the installation positions of the pair of protrusions can be adjusted.

  According to the present invention, it is possible to prevent the play between the suspension part of the crane lifting device and the crane hook by a simple method and to attach and detach the suspension part and the crane hook only by operating the crane. A crane lifting device that can be easily performed is provided.

  Hereinafter, an example of the best mode for carrying out the present invention will be described.

  FIG. 1 is a diagram showing an example of the overall configuration of a crane lifting device 1 according to the present invention. Moreover, FIG. 2 is an enlarged view of the handle part 1a of the crane lifting device 1 according to the present invention, wherein (a) is a front view and (b) is a side view. Here, FIG.1 and FIG.2 is the figure which showed the state which suspended the said conveyance lifting tool 1 for cranes with the crane hook 2. FIG.

  1 and 2 show a tong for transporting a steel plate coil in an ironworks, but the present invention is applied. The transport suspension is not limited to the tongue, and can be applied to a general transport suspension for transporting a transported object that requires high positioning accuracy of the turning angle of the transported object.

  As shown in FIG. 1 and FIG. 2, the transport hanger 1 according to the present invention is configured such that when the transport hanger 1 is suspended by a crane hook 2 on a handle 1 a of the transport hanger 1, the crane The hook 2 has a pair of protrusions 3a and 3b that abut against the flange side portions 2b1 and 2b2 on the tip side. Here, the pair of projecting portions 3a and 3b are the tip ends of the crane hook 2 with respect to the load position 2a on which the weight of the transport suspension 1 and the transported material, which becomes the suspension portion of the crane hook 2 collar, is applied. It is provided so as to come into contact with both side portions of the side flange portion.

  Here, when the pair of protrusions 3a and 3b are provided so as to come into contact with both side portions of the flange portion on the rear end side (root side) of the crane hook 2 with respect to the load position 2a, the crane hook When removing 2 from the transport hanger 1, the projections 3a, 3b and the crane hook 2 flange side portions 2b1, 2b2 may not be smoothly separated. Therefore, the projections 3a, 3b The load position 2a is provided so as to come into contact with both side portions of the flange portion on the distal end side of the crane hook 2.

  When the pair of protrusions 3a and 3b are provided so as to abut against the flange side portions 2b1 and 2b2 on the distal end side of the crane hook 2, the crane hook 2 further has a rear end side (root side). In the case where a pair of protrusions are provided so as to come into contact with both side portions of the collar portion, and when the crane hook 2 is not hindered from being removed from the transport suspension 1, the rear end side of the crane hook 2 ( You may make it provide a pair of projection part so that it may contact | abut to both sides of the collar part of a base side. As a result, it is possible to more reliably prevent the backlash between the suspension part 1a of the transport suspension and the crane hook 2.

  By adopting such a configuration, when the transporting lifting tool 1 is lifted by the crane hook 2, in addition to the load position 2a in the crane hook 2 collar, both sides of the collar from the load position 2a to the tip of the crane hook 2 The crane hook 2 is supported at two locations, 2b1 and 2b2, and the transport suspension 1 and the crane hook 2 are fixed, so that play (play) at the time of crane turning can be eliminated. As a result, it is possible to sufficiently ensure the positioning accuracy of the turning angle of the transported object by the crane.

  When the crane hook 2 is connected to the suspension part 1a, the load at the load position 2a and the flange side parts 2b1 and 2b2 at the tip end side of the crane hook 2 are applied at the three positions substantially simultaneously. It is preferable to adjust the positions of the protrusions 3a and 3b so as to contact each other. This is because the backlash between the hoisting portion 1a and the crane hook 2 is surely performed by securely restraining the crane hook 2 at three positions.

  Here, the protrusion 3 (3a, 3b) may be formed as a unitary structure with the handle 1a, but as shown in FIGS. 1 and 2, the position of the protrusion 3 is set. Is preferably configured to be adjustable. As a result, even when the shape and size of the crane hook 2 change, or when wear or the like occurs, the contact can be made at an optimum position for rattling.

  Here, the adjustment of the installation position of the protrusion 3 is carried out by adjusting the load position 2a in the crane hook 2 hook portion and the hook on the tip side of the crane hook 2 from the load position 2a when the transporting device 1 is lifted by the crane hook 2. It is necessary to carry out so that fixation at a total of three places is possible, with two places on both sides 2b1 and 2b2. Therefore, the protrusion 3 is configured to be position adjustable so that the load position 2a can be fixed at three locations, that is, two portions of the flange side portions 2b1 and 2b2 on the tip side of the crane hook 2. It is preferable.

  FIG. 3 shows an example of the configuration of the protruding portion 3 that can adjust the installation position. As shown in FIG. 3, the protrusion 3 includes a fixed hardware 4 that is fixed to the crane lifting device 1, a backlash stopping member 6 that is fixed to the fixed hardware 4 via a liner 5, and the fixed hardware. 4 and a set bolt 7 for screwing the liner 5 and the rattling member 6. Here, for example, by adjusting the thickness of the liner 5 or the number of sheets to be overlapped, the installation position of the backlash stopping member 6 can be adjusted.

  FIG. 4 shows an example of the shape of the pair of ratchet members 6. As the shape of the backlash-stopping member 6, the distance x between the members of the pair of backlash-stopping members 6 that are in contact with the flange side portions 2b1 and 2b2 on the tip side of the crane hook 2 becomes narrower toward the upper side. It needs to be shaped. This is to prevent biting when the crane hook 2 is detached.

  In addition, the method of adjusting the installation position of the projection 3 is not limited to the above method. For example, the projection 3 having various shapes and sizes is prepared in advance, and the shape and size of the crane hook 2 are prepared. It may be configured to be replaceable in accordance with. Furthermore, it is preferable that the installation position of the protrusion 3 is adjustable.

  Hereinafter, the result of having measured turning accuracy using a tong as a crane carrying suspension according to the present invention is shown. In addition, as a comparative example, the result of performing the same measurement using a tong according to the prior art is also shown.

  FIG. 5 is a plan view showing an outline of a method for measuring the turning accuracy. The turning accuracy is determined by lifting the tongue 1 with a crane, lowering the raised tongue 1 and then fully opening the tongue 1 and measuring the amount of deviation of the outer edge of the tongue 1 in the turning direction. The turning accuracy was measured as an angle. Here, the angle was measured as a deviation angle α, which is a deviation of a straight line connecting the left and right outer ends of the arm of the tongue 1 from a position when there is no backlash in the turning direction.

  Note that the amount of deviation measured by the above method is the amount of play (mechanical play) such as the clutch part on the crane side or the speed reducer, and the play (play) between the lifting part 1a of the transport suspension and the crane hook 2. ) The value added is measured.

  The turning accuracy is measured when a ton with a capacity of 27 tons is lifted by a crane with a rated load of 30 tons (a full opening dimension of 2300 mm), and a ton with a capacity of 45 tons is measured with a crane with a rated load of 60 tons. The measurement was performed when a fully opened dimension (2960 mm) was lifted.

  The measurement results of the turning accuracy are shown in Table 1 below. Here, the value of the turning accuracy shown in Table 1 is obtained by subtracting mechanical backlash, such as a clutch part on the crane side or a reduction gear, which was obtained separately from the amount of deviation measured by the above method. The precision with respect to the backlash amount only between the hanging part 1a and the crane hook 2 is shown.

  As shown in Table 1 above, when the crane lifting device according to the present invention was used, the backlash amount between the handle portion 1a and the crane hook 2 was 0 degree. On the other hand, when the crane transportation hanging tool according to the prior art is used, the amount of play is in the range of 2.5 to 4 degrees, and the effect of the present invention can be confirmed.

It is the figure which showed an example of the structure of the conveyance hanging tool for cranes which concerns on this invention. It is an enlarged view of the suspension part of the conveyance hanger for cranes which concerns on this invention, (a) is a front view, (b) is a side view. It is the figure which showed an example of the structure which enables adjustment of the installation position of the rattle stop member which concerns on this invention. It is the figure which showed an example of the shape of a pair of rattle stop member which concerns on this invention. It is a top view which shows the outline | summary of the method of measuring the turning precision in the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conveyance lifting tool 2 Crane hook 3 Protrusion part 4 Fixing hardware 5 Liner 6 Backlash member 7 Set bolt

Claims (2)

In the suspension part of the crane lifting device,
A crane-carrying lifting device, comprising a pair of protrusions that come into contact with both side portions of the crane hook on the distal end side of the crane hook when the conveying device is suspended by a crane hook.   The crane lifting device according to claim 1, wherein the installation position of the pair of protrusions is adjustable.

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