JP5132324B2 - Long object suspension device - Google Patents

Description

  The present invention relates to a long object suspension device that lifts or suspends long objects such as steel bars and steel pipes stored in a shelf.

  2. Description of the Related Art Conventionally, long products such as steel bars and steel pipes are stored in bundles for every fixed number on a dedicated storage shelf, for example. For example, the storage shelf forms a shelf member by passing a bar between a pair of support columns provided vertically with a set interval, and a plurality of the shelf members are arranged in the front-rear direction (the installation direction of the long object). It is configured by arranging.

  By the way, when an unbound long object stored in such a storage shelf is to be lifted from the lower part on both sides by an arm-shaped suspension device, the long object tends to spread by its own weight. There is a risk that friction will be generated between the column and the column and an excessive load will be generated on the crane or the like that lifts the suspension device.

  On the other hand, when lifting a bundle of long objects, as a suspension device that prevents an increase in friction generated between the long object and the column, for example, it extends downward from both ends of a horizontal support portion. A pair of arm portions, a pair of claw portions extending in a horizontal direction from the lower end of the arm portion and supported rotatably, and one end connected to the tip side of the pair of claw portions, and the other end side A suspension device including a chain connected to a hoisting device installed in a support portion is disclosed (see Patent Document 1). According to this configuration, since the long object can be squeezed from both sides by inserting the claw part below the long object and winding up the chain, the friction between the long object and the column is reduced, A long object can be easily lifted without applying a heavy load.

JP 2000-16747 A

  However, since the suspension device of Patent Document 1 uses a dedicated power source for the chain hoisting device, the weight is increased, the manufacturing cost is expensive, and the structure is complicated. There is a problem of lowering.

  It is an object of the present invention to suppress the generation of an excessive load due to spreading of a bundle of long objects when lifting or hanging a bundle of long objects, and to realize the configuration of the suspension device easily and at low cost. And

  In order to solve the above-mentioned problems, the present invention provides a gate-type lifting tool having a horizontal support part provided with a hanging bracket and a pair of arm parts provided to hang down at both ends of the support part. A pair of columnar members that are rotatably supported around the extending axis of the arm portion, a pair of claws that are respectively fixed to the lower end portion of the columnar member and extend in the horizontal direction, and the pair of claws and the support portion And a pair of deformable linear members having both ends connected to each other, the columnar member is slid into a sliding hole drilled in the extending direction from the lower end of the arm portion. It is inserted in a freely movable manner and is supported by the arm portion via a spring that elastically biases downward movement.

  According to this configuration, when a long object is lifted or hung, the load of the long object is applied to the cylindrical member, so that the cylindrical member moves downward against the elastic force of the spring. The formed linear member is stretched. As a result, the bundle of long objects sandwiched between the pair of linear members is squeezed from both sides, and the friction between the long object and the column is suppressed. A long object can be easily lifted or hung without being received. Moreover, according to this structure, since the power source which winds up a linear member is not required, the structure of a suspension apparatus is simplified and manufacturing cost can be reduced.

  In such a suspension device, it has a pin mounted perpendicularly to the cylindrical member, and a circumferential groove that engages with this pin is formed in the arm portion, and the cylindrical member is rotated in this circumferential groove. Thus, it is assumed that a guide groove is formed in which the pin engages downward from the circumferential groove at a position where the tips of the pair of claws face each other.

  That is, the pin is engaged in the circumferential groove in an unloaded state, and the claw can be rotated in this state. Then, when the ends of the pair of claws are opposed to each other, for example, when a load of a long object is applied to the claws during lifting, the pin moves to the stop position in the guide groove while being repelled by the elastic force of the spring. Thus, the long object is most squeezed by the linear member. Further, when the pin is accommodated in the guide groove, the rotation of the claw is restricted, so that the long object can be safely lifted or hung.

  Further, such a suspension device includes a motor that is supported by the arm portion and rotationally drives the column member, and the rotation shaft of the motor is slidable in the axial direction of the column member and engaged in the rotation direction. It is configured to be connected to the transmission shaft portion. According to this configuration, the cylindrical member can stably move and rotate in the vertical direction with a simple configuration.

  According to the present invention, when a bundle of long objects is lifted or suspended, generation of an excessive load due to spreading of the bundle of long objects can be suppressed, and the configuration of the suspension device can be simplified and reduced in cost. Can be realized.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part of a suspension device to which the present invention is applied. FIG. 2 is a side view of a suspension device to which the present invention is applied. FIG. 3 is a top view of a suspension device to which the present invention is applied. 4A and 4B are cross-sectional views for explaining the operation of the suspension device to which the present invention is applied. FIG. 4A is a view showing a state when no load is applied, and FIG. FIG. 5 is an enlarged view showing a section A of FIG. 6A and 6B are schematic diagrams for explaining the operation of the suspension chain in the suspension device to which the present invention is applied. FIG. 6A is a diagram showing a state when no load is applied, and FIG.

  The suspension device of the present embodiment has a function of lifting or hanging a long object (hereinafter referred to as a long object) such as a steel bar, steel pipe, mold steel, or round steel housed in a dedicated shelf in a bundle state. It is a hanging device.

  As shown in FIG. 1, the present suspension device is configured symmetrically, and is connected to a suspension beam body 1 that extends in the horizontal direction and an upper portion of the suspension beam body 1. A suspension fitting 3 for lifting the body, an outer cylinder 5 coupled to both sides of the suspension beam main body 1 in the width direction (left and right direction of the paper), and an arm connected and supported to the lower end of the outer cylinder 5 and extending downward. 7, a columnar rotation conduction shaft 9 supported rotatably around the extension axis of the arm 7, a claw 11 connected to the lower end of the rotation conduction shaft 9 and extending in the horizontal direction, The suspension beam main body 1 is provided with a chain-like suspension chain 13 whose both ends are connected.

  An electric motor 15 for rotating the rotary conduction shaft 9 is accommodated in the outer cylinder 5. The drive shaft of the electric motor 15 is connected to one end side of the transmission shaft portion 17 supported on the lower end surface of the outer cylinder 5, and the other end side of the transmission shaft portion 17 is one end of the rotary conduction shaft 9 housed in the arm 7. Connected with the side. That is, a sliding hole 19 is formed in the arm 7 so as to pass through in the axial direction, and the transmission shaft portion 17 is inserted into the sliding hole 19 from above, and the rotary conduction shaft 9 is slidable from below. Has been inserted. As a result, the rotational driving force of the electric motor 15 is transmitted to the rotational conducting shaft 9 via the transmission shaft portion 17. An oilless bearing 20 is provided in the gap between the sliding hole 19 and the rotary conduction shaft 9.

  A fall prevention nut 21 is attached to the upper end side of the rotary conduction shaft 9, and a space portion 23 whose diameter is increased to an inner diameter slightly larger than the outer diameter of the nut 21 is predetermined in the axial direction in the sliding hole 19. The length is formed. A compression spring 25 is provided in the gap between the nut 21 and the lower end of the space portion 23 so as to surround the rotation conduction shaft 9. When the rotation conduction shaft 9 moves downward, the compression spring 25 is compressed. An upward elastic force is applied to the rotary conduction shaft 9 and the claw 11 via the nut 21. The compression spring 25 is an elastic force that pushes up the nut 21 against the upper end of the space 23 in an unloaded state where a load of a long object is not applied, that is, an elasticity that pushes up the total weight of components such as the rotary conduction shaft 9, nut 21, and claw 11. It is supported in the arm 7 by force.

  An insertion hole 27 having a rectangular section is formed in the rotational conduction shaft 9 in the axial direction from the upper end surface, and a shaft having a rectangular section of the transmission shaft portion 17 is inserted into the insertion hole 27. That is, the rotary conduction shaft 9 slides in the vertical direction with the shaft of the transmission shaft portion 17 always inserted, and the rotational force of the transmission shaft portion 17 is transmitted. A disc-shaped receiving plate 29 and a cushion material 31 are provided between the nut 21 and the compression spring 25.

  On the other hand, a pin 33 projecting from the outer peripheral surface in the horizontal direction is attached to the rotary conduction shaft 9, and the rotation conduction shaft 9 is inserted into the sliding hole 19 of the arm 7 as far as possible, that is, the nut 21 is a space. A circumferential groove 35 with which the pin 33 is engaged is formed around the axis of the sliding hole 19 in a state in contact with the upper end of the portion 23. Further, the circumferential groove 35 has a guide for guiding the pin 33 downward by a predetermined distance at a predetermined rotational position, that is, at a rotational position where the tips of the pair of claws 11 face each other. A groove 37 is formed.

  The suspension chain 13 has one end connected to the side surface on the tip side of the claw 11 and the other end connected to the center of the suspension beam body 1. Here, the connection structure at both ends of the suspension chain 13 is a pin connection in which the angle of the connection portion is free. A pair of nail | claw 11 becomes the uneven | corrugated shape which mutually meshes | engages in the state which the front-end | tip opposes. The ends of the claws 11 are opposed to each other, and the suspension chain 13 is bent in a no-load state, that is, in a state where the rotary conduction shaft 9 is inserted to the end of the arm 7.

  In FIG. 1, the state in which the long object 43 is installed on the shelf member 41 is suspended in order to facilitate understanding of the positional relationship between the bundle of long objects stored in the dedicated shelf and the suspension device of the present embodiment. Overlaid on the device. For example, the dedicated shelf includes a plurality of pairs of support columns 45 provided in the vertical direction with a set interval, and a plurality of shelf members 41 are disposed between the pair of support columns 45. The bundle of long objects 43 is transferred and stored on each shelf member 41.

  As shown in FIGS. 2 and 3, a plurality of pairs of arms 7 and claws 11 are provided at predetermined intervals in the longitudinal direction of the suspension beam body 1, and the arms 7 adjacent in the longitudinal direction are connected by a reinforcing material 47. Chains are wound around the suspension fittings 3 so that the suspension beam body 1 is lifted by a crane or the like (not shown).

  Next, the operation of the rotary conduction shaft 9 sliding in the arm 7 will be described with reference to FIG. As shown in FIG. 4 (a), when the rotary conductive shaft 9 is unloaded, the nut 21 is pressed against the upper end of the space portion 23 by the elastic force of the compression spring 25, and is stored most in the sliding hole 19 of the arm 7. It will be in the state. At this time, the pin 33 of the rotary conduction shaft 9 is engaged with the circumferential groove 35.

  On the other hand, when a load is generated, the tips of the pair of claws 11 are arranged at positions facing each other, and the load of the long object 43 applies a downward force to the rotary conduction shaft 9 via the claws 11. The shaft 9 moves downward while being repelled by the elastic force of the compression spring 25 (the pin 33 moves downward in the guide groove 37). As shown in FIG. The movement stops in contact. At this time, the nut 21 is not in contact with the lower end of the space portion 23, and the rotary conduction shaft 9 is supported by the arm 7 via the pin 33. Here, the maximum movement amount (stroke) when the rotary conduction shaft 9 moves downward is L in the figure. Thus, when the rotary conduction shaft 9 moves downward, it moves while receiving the repulsive force of the compression spring 25, so that it is possible to absorb the impact in the vertical direction applied to the claw 11 and the like during loading.

  As shown in FIG. 5, the arm 7 has a double tube structure of an outer cylinder 7a connected to the lower end of the outer cylinder 5 and an inner cylinder 7b provided with an outer peripheral surface in close contact with the inner peripheral surface of the outer cylinder 7a. It has become. A circular groove 35 having a circular cross section is formed inside the outer cylinder 7a so that the pin 33 is rotatably engaged. Below the circumferential groove 35, a guide groove 37 having a depth L corresponding to the stroke of the rotary conduction shaft 9 is formed at a position of a predetermined rotation angle. In this embodiment, an example in which the circumferential groove 35 is formed in a circular cross section is used. However, the shape is not limited to this shape as long as it has an action similar to that of the present embodiment. The groove may be a fan having a cross section having a predetermined angle.

  Next, the operation when the suspension device of the present embodiment lifts a bundle of long objects will be described. As shown in FIG. 1, the pair of arms 7 and the claws 11 are lowered from both sides of the long object 43, and the upper surface of the claws 11 is fixed at an arbitrary position below the installation height of the long object 43. To do. At that time, the claw 11 is directed in a direction parallel to the long object 43, for example, in order to avoid contact with the inner long object 43. And the nail | claw 11 is rotated by the drive of the electric motor 15, and it inserts in the clearance gap below the elongate object 43, it is set as the state which meshed | engaged with the front-end | tip of a pair of nail | claw facing each other. The long object 43 is lifted by moving it.

  Here, the operation of the suspension chain 13 when lifting the bundle of long objects 43 will be described with reference to FIG. In the unloaded state of FIG. 6A, when the crane hoisting operation is started and the lifting device is lifted, the rotary conductive shaft 9 is connected to the compression spring 25 with the pawl 11 in contact with the lower part of the long object 43. It stays there while being repelled by the elastic force. As a result, the distance between the suspension beam main body 1 and the claw 11 is increased, and the suspension chain 13 is pulled downward with respect to the suspension beam main body 1 as shown in FIG. It moves in the direction of squeezing, that is, in the direction of the arrow 49.

  When the long object 43 is lifted or suspended in this way, the suspension chain 13 is pulled in the vertical direction to squeeze the long object 43, so that the frictional force associated with the contact between the long object 43 and the column 45 is reduced. Or it can be eliminated. Thereby, it is possible to prevent the bundle of long objects 43 from spreading and to suppress the generation of an excessive load due to contact with the support 45. In addition, according to the suspension device of the present embodiment, the rotation conducting shaft 9 moves in a load state, and the suspension chain 13 is naturally stretched from the loosened state according to the movement. Therefore, a power source for winding up the suspension chain 13 is necessary. In this way, the structure of the suspension device is simplified, the design freedom can be improved, and the weight can be reduced and the manufacturing cost can be reduced.

  Note that the suspension chain 13 of the present embodiment is configured so that the long object 43 is continuously moved until the pin 33 attached to the rotating conduction shaft 9 comes into contact with the lower end of the guide groove 37 and the movement of the rotating conduction shaft 9 is stopped. Therefore, it is preferable that the length is set such that a certain amount of bending occurs even in this stopped state. The suspension chain 13 is not limited to the chain of this embodiment as long as it has a predetermined strength and a deformable structure.

It is sectional drawing showing the principal part of the suspension apparatus to which this invention is applied. It is a side view of a suspension device to which the present invention is applied. It is a top view of a suspension device to which the present invention is applied. It is sectional drawing explaining operation | movement of the suspension apparatus to which this invention is applied, (a) is a figure at the time of no load, (b) is a figure which shows the state at the time of load. It is a figure which expands and shows the A section cross section of FIG. It is a schematic diagram explaining operation | movement of the suspension chain in the suspension apparatus to which this invention is applied, (a) is a figure at the time of no load, (b) is a figure which shows the state at the time of load.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suspension beam main body 3 Suspension metal fitting 5 Outer cylinder 7 Arm 9 Rotation conduction shaft 11 Claw 13 Suspension chain 17 Transmission shaft part 21 Nut 23 Space part 25 Compression spring 33 Pin 35 Circumferential groove 41 Shelf member 43 Long object 45 Post

Claims (3)

A gate-type lifting tool having a horizontal support part provided with a hanging bracket and a pair of arm parts suspended from both ends of the support part, and rotating around an extension axis of the arm part A pair of columnar members supported respectively, a pair of nails fixed to the lower end of the columnar member and extending in the horizontal direction, and a deformation in which both ends are connected to the pair of nails and the support unit In a long object suspension device comprising a pair of free linear members,
The columnar member is slidably inserted into a sliding hole drilled in a direction extending from the lower end of the arm portion, and supported by the arm portion via a spring that elastically biases downward movement. A long object hanging apparatus characterized by being made. The long object suspension apparatus according to claim 1,
A pin mounted perpendicularly to the cylindrical member, and a circumferential groove engaging with the pin is formed in the sliding hole, and the cylindrical member is rotated in the circumferential groove; A long object suspension device, wherein a guide groove is formed to engage the pin downward from the circumferential groove at a position where the tips of the pair of claws are opposed to each other. The long object suspension apparatus according to claim 1 or 2,
The motor includes a motor supported by the arm and configured to rotate the cylindrical member. A rotation shaft of the motor is coupled to a transmission shaft that is slidable in the axial direction of the cylindrical member and engaged in the rotational direction. A long object suspension device characterized by comprising: