Lifting device

Abstract

To provide a lifting device having a novel structure that can improve the workability and safety in a series of operations for removing and transporting a heavy load.SOLUTION: A lifting device 1 comprises a pair of arms 2A, 2B curved in an arc and arranged to face each other so that their insides are concave and their outsides are convex, an arm support member 4 that rotatably supports base ends 13 of the arms so that the tips of the pair of arms 2A, 2B open and close, and a fastening member 6 that brings the tips of the pair of arms 2A, 2B close to each other and fastens an object to be suspended W located between the pair of arms 2A, 2B. The center of rotation of one arm 2A and the center of rotation of the other arm 2B are provided at one end side and the other end side of the arm support member 4, spaced apart from each other.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lifting device used when lifting and transporting a heavy load with a lifting device such as a crane. [Background technology]

[0002] When replacing a part attached to a processing device, etc., if the part is heavy, the part is removed using the following procedure. First, a nylon sling is wrapped around the outer periphery of the part, and the part is suspended by a lifting device such as a crane while being pulled out of the processing device, and then the part is transported to a specified location.

[0003] However, when using a nylon sling to suspend heavy parts, the tightening force applied to the parts is not always sufficient, and there is a risk that the parts will fall if an external force is applied from the side. Therefore, a lifting device that can suspend and transport heavy objects more safely is needed. A jig for suspending a heavy object is disclosed, for example, in the following patent document. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-301573 [Patent Document 2] JP 2000-355482 A [Patent Document 3] JP 2001-63957 A Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE PRESENT EMBODIMENT In view of the above circumstances, an object of the present invention is to provide a lifting device having a novel structure that can improve the workability and safety in a series of operations for removing and transporting a heavy load. [Means for solving the problem]

[0006] Thus, the sling device according to the first aspect of the present invention is defined as follows: A pair of arms curved in an arc shape and disposed opposite each other so that the inside is concave and the outside is convex; an arm support member that rotatably supports base ends of the arms so that tip ends of the pair of arms can open and close; a clamping member that brings tip ends of the pair of arms closer to each other to clamp an object to be suspended that is located between the pair of arms; Equipped with The center of rotation of one arm and the center of rotation of the other arm are provided at one end side and the other end side of the arm support member, spaced apart from each other.

[0007] According to the suspension device of the first aspect defined in this manner, the tightening force applied to the object to be suspended is increased compared to when a nylon sling is used, thereby improving safety when suspending heavy objects. In addition, in the first aspect of the suspension device in which the center of rotation of one arm and the center of rotation of the other arm are separated from each other on one end side and the other end side of the arm support member, the length of the rotating arms is short and when the arms are opened, they are prevented from protruding toward the arm support member side, thereby improving workability when attaching and detaching the suspension device to the object to be suspended in a limited working space.

[0008] In addition, this invention can be configured to include an arm position fixing means capable of fixing the arms in a first position in which the tip ends of the arms are upward and the base ends are downward when the arms are suspended by a lifting device such as a crane via the lifting portions provided on each of the pair of arms (second aspect). In this first position, a reaction force against the weight of the suspended object acts in a direction that brings the tip ends of the pair of arms closer to each other, so that the fastening force applied to the suspended object can be increased.

[0009] Here, the arm position fixing means can be configured to be capable of fixing the arm in the first position or in a second position in which the tip and base ends of the arm are at approximately the same height (third aspect). In this way, by switching the orientation of the suspended object that has been transported directly above the destination to the second position, it is possible to improve workability and safety when lowering the suspended object to the destination.

[0010] In the present invention, in a state where the pair of arms are suspended by a lifting device such as a crane via a suspending portion provided on each of the pair of arms, the arms are configured to be rotatable relative to the suspending portion, A stopper pin may be provided that rotates integrally with the arm relative to the hanging portion and abuts against the hanging portion to restrict the rotatable range of the arm (fourth aspect). This limits the range within which the arm can rotate relative to the hanging portion, making it possible to prevent unintended changes in the posture of the suspended object during transport, etc.

[0011] Furthermore, in this invention, the arm support member can be formed in an arc shape so that the inside facing the suspended object is concave and the outside is convex (fifth aspect). In this way, when the suspended object is a heavy object with a circular cross section, the weight of the suspended object can be stably supported.

[0012] In addition, in this invention, a rubber sheet can be attached to the inner surface of the arm that comes into contact with the suspended object (sixth aspect), thereby increasing the contact area with the suspended object when tightening.

[0013] In addition, the present invention can include an inner tube holder that extends from a base end attached to the arm in the axial direction of the suspended object and is then bent inwardly of the arm. In this case, a handle can be provided at the tip of the inner tube holder that faces the end face of the suspended object (seventh aspect). In this way, even if the object to be suspended has a double-cylinder structure in which an outer cylinder is placed outside an inner cylinder, it is possible to prevent the inner cylinder that is not fastened by the arm from slipping out in the axial direction. Also, by providing a handle at the tip of the inner cylinder presser that faces the end face of the object to be suspended, it is possible to improve the ease of operation when moving the object to be suspended in the axial direction.

[0014] Furthermore, the present invention can be configured to include a connecting fitting that can be hooked to a chain block (an eighth aspect). [Brief description of the drawings]

[0015] [Figure 1] 1 is a diagram showing an overall configuration of a suspension device according to an embodiment of the present invention; [Diagram 2] FIG. [Diagram 3] FIG. 3 is a view taken along the line III-III of FIG. [Figure 4] FIG. 4 is a diagram showing the sling device with a pair of arms in an open state. [Diagram 5] FIG. 4 is a left side view of the sling device with the positioning member separated. [Figure 6] 6 is a left side view of the sling device, showing a state in which the arm is rotated 90° from that in FIG. 5. [Figure 7] FIG. 2 is a plan view of the fastening member of FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. [Figure 9] 11 is an explanatory diagram of a feed roller removal operation using the hanging device. FIG. [Figure 10] 10 is an explanatory diagram of the feed roller removal operation using the hanging device, continuing from FIG. 9. FIG. [Figure 11]FIG. 13 is a diagram showing a feed roller as an object to be hung. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Next, a suspension device according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following, when describing the positional relationship and direction of operation of the hoisting device, the "upper and lower directions" are specified based on the state in which the hoisting device is suspended by a hoisting device such as a crane.

[0017] FIG. 11 is a diagram showing a feed roller as a suspended object. The feed roller W shown in the figure is a cylindrical part provided in the material supply section of a processing device, and conveys the processing material S sandwiched between a pair of upper and lower feed rollers W toward the inside of the processing device based on the rotation of the feed roller W. As shown in the figure, the feed roller W has a double-cylinder structure in which an outer cylinder W1 is arranged on the outside of an inner cylinder W2, and has a stepped shape in which cylindrical parts with different outer diameters are provided in multiple stages in the axial direction as a whole. A groove with a V-shaped cross section is formed around the entire circumference on the outer circumferential surface 80a of the large diameter portion 80 of the feed roller W that comes into contact with the processing material S. This outer circumferential surface 80a wears due to contact with the processing material S, so the feed roller W needs to be replaced periodically.

[0018] Fig. 1 is a diagram showing the overall configuration of a hoisting device according to one embodiment of the present invention. The hoisting device 1 in the figure is configured to include a pair of arms 2A, 2B, an arm support member 4 that supports these arms, suspending portions 5A, 5B provided for the arms 2A, 2B, respectively, and a fastening member 6 that fastens a feed roller W as an object to be suspended. The hoisting device 1 further includes a connecting fitting 7 and chains 8A, 8B, and is used in a state in which it is suspended by a hook 9 of a hoisting device such as a crane.

[0019] The pair of arms 2A, 2B are each made of a bent metal plate material, and are disposed opposite each other on the left and right sides in FIG. Most of the longitudinal direction of arms 2A, 2B is formed as a contact portion 11 curved in an arc shape so that the inside is concave and the outside is convex. This contact portion 11 contacts the outer circumferential surface 80a (see FIG. 11) of a feed roller W as an object to be suspended located between the pair of arms. A rubber sheet 12 is attached to the inner surface of contact portion 11 (the surface that comes into contact with feed roller W). On the other hand, base ends 13 of arms 2A, 2B, which are located below contact portion 11 in the figure, are curved in the opposite direction to contact portion 11 and joined to rotating portions 21A, 21B of arm support member 4.

[0020] The arm support member 4 is a member that rotatably supports the base ends 13 of the arms 2A and 2B, and is provided with a pair of rotating parts 21A and 21B, and a base part 22 that supports these rotating parts. The base portion 22 is composed of a pair of plate members 23, 23 arranged opposite each other at a distance in a direction perpendicular to the plane of the paper in Figure 1, and is formed in an arc shape so that the inner side (the side facing the outer peripheral surface 80a of the feed roller W) is concave and the outer side is convex when viewed from the front as shown in Figure 1.

[0021] 3, the rotating parts 21A and 21B include a fixed shaft 26 fixed to the base part 22 while penetrating the plate material 23 of the base part 22 in the plate thickness direction, and an outer cylinder part 28 disposed outside the fixed shaft 26 via a bush 27, and the outer cylinder part 28 is configured to be rotatable about the fixed shaft 26. In other words, the fixed shaft 26 forms the center of rotation of the arms 2A and 2B. The base ends 13 of the arms 2A and 2B are integrally joined to the outer cylinder parts 28 of the rotating parts 21A and 21B, respectively.

[0022] 1, the rotating parts 21A, 21B are provided at a distance from one another on one end side and the other end side of the arm support member 4. In other words, the rotation center of one arm 2A and the rotation center of the other arm 2B are provided at a distance from one another on one end side and the other end side of the arm support member 4. In the hanging device 1 configured in this manner, as shown in FIG. 4, the length of the rotating arms is shortened and protrusion downward (toward the arm support member 4) when the arms 2A, 2B are opened is suppressed, thereby improving the workability when attaching and detaching the hanging device 1 to and from the feed roller W in a narrow space.

[0023] 1 includes a substantially U-shaped hanging fitting 31 (see FIG. 5), fitting engagement parts 32 that engage with both ends of the hanging fitting 31, and a mounting bolt 33. The hanging parts 5A, 5B are attached by the mounting bolt 33 to the mounting surface of a base part 35 joined to the arms 2A, 2B. Suspension parts 5A, 5B are configured so that suspension fitting 31 and fitting engagement part 32 can rotate around the axis of mounting bolt 33, and for example, a commercially available swivel eyebolt can be used as the suspension part. As shown in Figure 1, the pair of suspension parts 5A, 5B are disposed near a horizontal axis HL that passes through the center of the held feed roller W, and allow rotation of arms 2A, 2B around the horizontal axis HL.

[0024] Fig. 5 is a diagram showing the left side of the sling device of Fig. 1. In this figure, reference numeral 40 denotes a positioning member. Positioning member 40 is formed with a knob portion 41, a flange portion 42, a block-shaped portion 43, and a tip engagement portion 44 in this order from the left in the figure. Tip engagement portion 44 has a diameter slightly smaller than the diameter of guide holes 38A, 38B formed on arm 2A, and is capable of being inserted into guide holes 38A, 38B. When tip engagement portion 44 is inserted into guide holes 38A, 38B, flange portion 42 abuts against hanging hardware 31 to regulate the position in the insertion direction. The block-shaped portion 43 is sized to be able to enter the inside of the hanging bracket 31, and when the tip engagement portion 44 is inserted into the guide holes 38A, 38B, the block-shaped portion 43 is positioned inside the hanging bracket 31, regulating the relative rotation between the arm 2A and the hanging portion 5A.

[0025] Reference numeral 37 denotes a plate-like member having guide holes 38A, 38B formed therein, and is attached integrally to base portion 35. Guide holes 38A and 38B that engage with tip engagement portion 44 of positioning member 40 are through holes that penetrate plate-like member 37 in the plate thickness direction, and are formed at positions spaced 90° apart around the rotation axis of hanging portion 5A.

[0026] In this example, as shown in Figure 5, when the suspension device 1 is viewed from the side, guide hole 38A formed at a position overlapping with arm 2A can be faced to the inside of the suspension bracket 31. By inserting tip engagement portion 44 of positioning member 40 into guide hole 38A, arm 2A can be fixed in a first position in which the tip end of arm 2A is up and the base end is down. On the other hand, when the suspension device 1 is viewed from the side, if guide hole 38B formed in a position that does not overlap with arm 2A (the position where suspension bracket 31 is rotated 90 degrees to the right as viewed in Figure 5) is able to face the inside of suspension bracket 31, and tip engagement portion 44 of positioning member 40 is inserted into guide hole 38B, arm 2A can be fixed in a second position in which the tip and base ends of arm 2A are at approximately the same height (i.e., arm 2A is in a horizontal position), as shown in Figure 6. The positioning member 40 and the plate-like member 37 having the guide holes 38A, 38B formed therein are elements for fixing the arm 2A in either the first or second position, and correspond to the arm position fixing means of the present invention.

[0027] 5 are stopper pins erected on the mounting surface of base portion 35. Stopper pins 39A, 39B rotate integrally with arm 2A relative to hanging portion 5A and abut against hanging metal fitting 31 to restrict the rotation of arm 2A. In this example, stopper pins 39A and 39B are disposed so that the rotatable range RD of arm 2A is limited to a range of 90° as indicated by the arrow in the figure during the transition from the first position shown in FIG. 5 to the second position shown in FIG. 6. The above describes the positioning member 40, guide holes 38A, 38B and stopper pins 39A, 39B provided on the hanging portion 5A side, but the same positioning member 40, guide holes 38A, 38B and stopper pins 39A, 39B that function similarly are provided on the hanging portion 5B side.

[0028] Next, the fastening member 6 will be described. As shown in Fig. 7, the fastening member 6 is composed of a hook-shaped receiving metal fitting 50 attached to the tip of the arm 2B, a hooking member 52 attached to the tip of the arm 2A, and an operating lever 56. A hooking metal fitting 53 capable of being hooked onto the receiving metal fitting 50 is provided on the tip side of the hooking member 52, and its base end side is connected to the operating lever 56 via a shaft 55 so as to be rotatable relative to the operating lever 56. When the tip of the hanging member 52 in the fastening member 6 is hung on the receiving bracket 50, the feed roller W is surrounded by a ring-shaped body consisting of the arms 2A, 2B, the arm support member 4 and the fastening member 6. When the operating lever 56 is further rotated counterclockwise in FIG. 1 around the axis 57, the tips of the pair of arms 2A, 2B approach each other, and the feed roller W is clamped and fixed.

[0029] The shaft 54 ​​and the hook fitting 53 of the hook member 52 are screwed together so that the length of the hook member 52 can be adjusted. This makes it possible to adjust the fastening force during the fastening operation by changing the length of the hook member 52, even if the outer diameter of the feed roller W changes.

[0030] In Fig. 1, reference numeral 60 denotes an inner tube presser. As shown in Fig. 8, the inner tube presser 60 is a generally L-shaped member that extends from a base end 61 attached and fixed to the arms 2A and 2B in the axial direction of the feed roller W (to the right in Fig. 8) and is then bent inwards of the arms 2A and 2B (towards the center of the feed roller W), with its tip end 62 facing the end face of the feed roller W. The inner tube pressers 60 are provided on the arms 2A and 2B respectively so as to be symmetrical on the left and right when the hanging device 1 is viewed from the axial direction. This inner tube holder 60 can prevent the inner tube W2, which is not fastened by the arms 2A, 2B, from unintentionally slipping out in the axial direction when the feed roller W has a double tube structure in which the outer tube W1 is arranged outside the inner tube W2.

[0031] A handle 64 is provided at the tip 62 of the inner cylinder presser 60. This handle 64 is suitable for use when an operator moves the feed roller W fitted onto the shaft along the shaft, as shown in Fig. 9. In this example, in addition to the handle 64, handles 67 are directly attached to the arms 2A and 2B, respectively.

[0032] Next, a procedure for removing the feed roller W from the processing device and transporting it using the hoisting device 1 will be described. 9(A), the feed roller W is fitted onto a shaft 85 that protrudes horizontally from the side of the processing device. To remove the feed roller W, first, as shown by the two-dot chain line, a new shaft 86 is screwed onto the end face of the shaft 85, and a sleeve 87 that provides a guide surface flush with the outer circumferential surface of the shaft 85 on the processing device side is fitted onto the shaft 86. Next, the arms 2A, 2B of the sling device 1 are wound around the outer circumferential surface 80a of the feed roller W, and the fastening members 6 are operated to fasten and fix the feed roller W.

[0033] Then, the worker grasps the handle 64 of the hoisting device 1 and pulls out the feed roller W to the right in the figure along the guide surface of the sleeve 87, as shown in Fig. 9(B). At this time, the hoisting device 1 is suspended by an overhead crane (not shown). More specifically, in order to enable precise (in millimeters) adjustment of the height of the feed roller W, a chain block (not shown) is interposed between the overhead crane and the hoisting device 1, and the connecting fitting 7 of the hoisting device 1 is hooked onto a lower hook 9 provided at the lower end of the load chain of the chain block. Then, while being suspended by the overhead crane, feed roller W is moved further to the right from the state shown in Fig. 9(B) while adjusting the height of feed roller W, and feed roller W is pulled out from shaft 86. At this time, positioning member 40 is inserted into guide hole 38A so that arms 2A, 2B are fixed in a first posture in which the tips of arms 2A, 2B are upward and the base ends are downward.

[0034] After the feed roller W is pulled out from the shaft 86, the feed roller W is moved toward the destination using an overhead crane while maintaining the first position. Then, as shown in Fig. 10, once directly above the destination, the positioning member 40 is pulled out, and the feed roller W together with the arms 2A, 2B are rotated 90° around the suspenders 5A, 5B, and the positioning member 40 is inserted into the guide hole 38B so that the arms 2A, 2B are fixed in the second position in which the tip and base ends of the arms are at approximately the same height. Then, while maintaining the second position, the feed roller W is lowered onto the top surface of the platform at the destination, and the suspender device 1 is removed, completing the series of operations. The operation of attaching a new feed roller W to the processing apparatus using the hoisting device 1 is carried out in the reverse order to the operation of removing the feed roller W.

[0035] As described above, according to the suspending device 1 of the present embodiment, the fastening force applied to the feed roller W is increased compared to the case where a nylon sling is used, and safety when suspending the feed roller W can be improved. Furthermore, in the suspension device 1 in which the center of rotation of arm 2A and the center of rotation of arm 2B are separated on one end side and the other end side of the arm support member 4, the rotating arm length is short and when arms 2A, 2B are opened, the arms are prevented from protruding toward the arm support member 4 side, thereby improving the workability when attaching and detaching the suspension device 1 in a limited work space.

[0036] The hoisting device 1 of this embodiment is also provided with arm position fixing means 37, 40 capable of fixing the positions of the arms in a first position in which the tips of the arms are upward and the base ends are downward when the hoisting device 1 is suspended by a crane or the like via suspenders 5A, 5B provided on the pair of arms 2A, 2B, respectively. In the first position, a reaction force against the weight of the feed roller W acts in a direction that brings the tips of the pair of arms 2A, 2B closer to each other, thereby increasing the tightening force on the feed roller W.

[0037] Furthermore, in the suspension device 1 of this embodiment, the arm position fixing means 37, 40 are configured to enable the arms to be fixed in a first position or a second position in which the tip and base ends of the arms 2A, 2B are at approximately the same height. Therefore, by switching the feed roller W transported directly above the destination to the second position, it is possible to improve workability and safety when lowering the feed roller W onto the top surface of the platform at the destination.

[0038] In addition, in the lifting device 1 of this embodiment, when the pair of arms 2A, 2B are suspended by a crane or the like via the suspension parts 5A, 5B provided on each of the arms 2A, 2B, the arms 2A, 2B are configured to be rotatable relative to the suspension parts 5A, 5B, and stopper pins 39A, 39B are provided which rotate integrally with the arms relative to the suspension parts 5A, 5B and abut against the suspension fittings 31 of the suspension parts 5A, 5B to regulate the rotation range RD of the arms 2A, 2B. Therefore, the rotation range RD of the arms 2A, 2B relative to the hanging portions 5A, 5B is limited, and unintended changes in the posture of the feed roller W during transport or the like can be suppressed.

[0039] In addition, in the hanging device 1 of this embodiment, the arm support member 4 is formed in an arc shape so that the inner side facing the feed roller W is concave and the outer side is convex, thereby enabling the weight of the feed roller W, which has a circular cross-section, to be stably supported.

[0040] Furthermore, in the sling device 1 of this embodiment, rubber sheets 12 are attached to the inner surfaces of the arms 2A, 2B that come into contact with the feed roller W, thereby increasing the contact area with the feed roller W during tightening.

[0041] In addition, the suspension device 1 of this embodiment is provided with an inner tube presser 60 that extends in the axial direction of the feed roller W from a base end 61 attached to the arms 2A, 2B and then is bent inwardly of the arms 2A, 2B, thereby preventing the inner tube W2 of the feed roller W that is not fastened by the arms 2A, 2B from slipping out in the axial direction. A handle 64 is provided at the tip 62 of the inner cylinder retainer 60 facing the end face of the feed roller W, which improves the ease of movement of the feed roller W along the shaft.

[0042] Furthermore, since the hoisting device 1 of this embodiment can be connected to a chain block, it is possible to adjust the height of the feed roller W in millimeter units, thereby shortening the operation time.

[0043] Although the embodiment of the present invention has been described in detail above, this is merely an example. For example, the above embodiment is an example of application to a suspended object having a double-tube structure with an inner tube W2 and an outer tube W1, but the sling device of the present invention can be suitably used for suspended objects of various shapes with an outer circumferential surface having a circular cross section, and the present invention can be configured in various modified forms without departing from the spirit of the present invention. [Explanation of symbols]

[0044] 1 Lifting device 2A,2B Arm 4 Arm support member 5A, 5B Hanging part 6 Fastening member 7 Connecting fittings 12 Rubber sheet 37 Plate-shaped member (arm position fixing means) 39A, 39B Stopper pin 40 Positioning member (arm position fixing means) 60 Inner cylinder holder 61 Proximal end 62 Tip 64 Toride RD Rotation Range W Feed roller (hanging object)

Claims

1. A pair of arms curved in an arc shape and disposed opposite each other so that the inside is concave and the outside is convex; an arm support member that rotatably supports base ends of the arms so that tip ends of the pair of arms can open and close; a clamping member that brings tip ends of the pair of arms closer to each other to clamp an object to be suspended that is located between the pair of arms; Equipped with a rotation center of one arm and a rotation center of the other arm are provided at a distance from each other on one end side and the other end side of the arm support member.

2. 2. The lifting device as described in claim 1, further comprising an arm position fixing means capable of fixing the arms in a first position in which the tip end of the arm is upward and the base end is downward when the arms are suspended by a lifting device such as a crane via the lifting portions provided on each of the pair of arms.

3. 3. The suspension device according to claim 2, wherein the arm position fixing means is configured to be capable of fixing the arm in the first position or in a second position in which the tip and base ends of the arm are at approximately the same height.

4. In a state where the pair of arms are suspended by a lifting device such as a crane via a suspending portion provided on each of the pair of arms, the arms are configured to be rotatable relative to the suspending portion, The suspension device according to claim 1 , further comprising a stopper pin that rotates integrally with the arm relative to the suspension portion and abuts against the suspension portion to restrict a range within which the arm can rotate.

5. The suspension device according to claim 1 , wherein the arm support member is formed in an arc shape so that an inner side facing the object to be suspended is concave and an outer side is convex.

6. 2. The suspension device according to claim 1, wherein a rubber sheet is attached to an inner surface of the arm that contacts the object to be suspended.

7. 2. The suspension device as described in claim 1, further comprising an inner tube clamp that extends from a base end attached to the arm in the axial direction of the object to be suspended and is then bent inwardly of the arm, and a handle is provided at the tip of the inner tube clamp that faces the end face of the object to be suspended.

8. 2. The lifting device according to claim 1, further comprising a connecting fitting capable of being hooked to a chain block.

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