Hanging equipment

Abstract

To provide a lifting tool that can be handled excellently and prevent damage to the lifting tool and an object to be conveyed.SOLUTION: There is provided a lifting tool for hoisting an object T to be conveyed with a straight hole S formed on a top surface, comprising: a lift part 2 to be lifted; a wedge shaft part 3 connected to the lift part 2 and having a diameter expanded part 23 that expands in a direction away from the lift part 2; a composite anchor part 4 having a plurality of anchor members 31 disposed around the diameter expanded part 23; and a ring member 6 for binding the plurality of anchor members 31. When the wedge shaft part 3 moves relative to a lifting direction, the diameter expanded part 23 pushes each anchor member 31 outward in a radial direction and presses a bore wall of the straight hole S with an outer peripheral surface of the composite anchor part 4.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This invention relates to a lifting device for lifting transported objects. [Background technology]

[0002] When block-shaped materials such as fire-resistant blocks, concrete blocks, and carbon blocks become large, handling operations using cranes and other equipment become necessary. When it is difficult to wrap lifting wires around these materials, a method of handling is employed that utilizes holes drilled in the top surface of the materials.

[0003] For example, the lifting device described in Patent Document 1 comprises a sleeve made of rigid urethane rubber, a tapered core inserted into the hollow portion of the sleeve, and an eye nut provided at the base end of the core. The sleeve is partially divided into four sections, making it easily deformable. After inserting the lifting device into the reverse-tapered hole of the object to be transported, lifting it via the eye nut causes the sleeve to expand radially outward due to the tapered core, pressing the outer surface of the sleeve against the hole wall of the reverse-tapered hole. This allows the object to be easily lifted and transported. Furthermore, after transporting the object to a predetermined position, pushing down the core against the sleeve releases the engagement (expanded state) between the lifting device and the reverse-tapered hole, allowing the lifting device to be easily removed. This enables rapid transport operations. Patent Document 2 discloses a lifting device in which the tip of the lifting device is notched, and the portion expands with a tapered sleeve inside, allowing for one-touch attachment and detachment within a straight hole. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Utility Model Registration No. 3035314 Gazette [Patent Document 2] Chinese Patent Publication No. 112065832 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] In the lifting device described in Patent Document 1, it is necessary to drill a hole in the lifted load that has an inverted tapered shape, where the hole widens at the back. This is difficult to do with a normal drill, requiring special jigs and skilled work, making it difficult to easily prepare an inverted tapered hole. Furthermore, because the sleeve is pushed radially outward within the inverted tapered hole, it becomes difficult to return to its original shape due to aging deterioration, and the outer diameter of the sleeve gradually increases. When the outer diameter of the sleeve increases, it becomes difficult to insert and remove the sleeve from the inverted tapered hole, and the load (stress) concentrates on the upper surface of the tapered hole, which can easily lead to damage to the block. In addition, in the lifting device described in Patent Document 1, a part of the sleeve is divided, which makes it prone to cracking due to aging deterioration, and thus prone to damage to the sleeve.

[0006] Furthermore, in Patent Document 2, the expansion opening in the sleeve is linear, and the stress causing expansion is concentrated around the expansion opening, leading to problems such as detachment due to insufficient friction and failure of the suspended load. In the lifting devices described in either Patent Document, uneven surface pressure is generated on the inner surface of the block's insertion hole, resulting in uneven stress generated inside the block.

[0007] From this perspective, the object of the present invention is to provide a lifting device that is easy to handle and can prevent damage to the lifting device and the transported object. [Means for solving the problem]

[0008] The present invention, which solves the aforementioned problems, is a lifting device for lifting a conveyed object having a straight hole formed on its upper surface, comprising: a lifting section to be lifted; a wedge shaft section connected to the lifting section and having an enlarged diameter section that expands in a direction away from the lifting section; a composite anchor section having a plurality of anchor members arranged around the enlarged diameter section; and a ring member that bundles the plurality of anchor members, wherein when the wedge shaft section moves relative to the lifting section, each of the anchor members is pushed radially outward by the enlarged diameter section, and the outer circumferential surface of the composite anchor section presses against the hole wall of the straight hole. This makes it possible to generate uniform surface pressure on the inner surface of the insertion hole of the object to be lifted, maximizing the allowable lifting load, which is a performance characteristic of the lifting device, and significantly suppressing the random occurrence of block breakage, thereby providing a lifting device that is significantly more high-performance and safer than conventional lifting devices.

[0009] Furthermore, in this invention, the composite anchor section is composed of multiple anchor members, which are bundled together by a ring member. In other words, since the anchor members are originally divided, the risk of cracks forming in a part of the composite anchor section can be reduced. Also, because the composite anchor section is composed of multiple anchor members, it can be pushed outward to press against the hole wall of the straight hole, and the multiple anchor members can be bundled together by the ring member. In addition, the ring member prevents the multiple anchor members from separating, allowing them to be easily inserted into and removed from the straight hole.

[0010] Furthermore, it is preferable that the outer circumferential surface of the anchor member has protrusions and recesses that improve the frictional force with the hole wall of the straight hole. The protrusions and recesses on the outer circumferential surface of the anchor member can increase the frictional force between the hole wall of the straight hole, which is curved in the circumferential direction, and the outer circumferential surface of the composite anchor portion, thereby enabling reliable lifting of the transported object.

[0011] Furthermore, the lift portion, the wedge shaft portion, and each of the anchor members are made of metal, the inclination angle α between the axial central axis of the wedge shaft portion and the outer surface of the enlarged diameter portion is 0.9° or more and less than 4.3°, and the compressive stress received by the hole wall of the straight hole from the anchor member is 10 N / mm 2 The following is preferable:

[0012] According to the present invention, the transported object can be transported without being crushed by the lifting device.

[0013] Furthermore, in the lifting device of the present invention, each outer surface constituting the enlarged diameter portion is formed as a flat surface, and when the lift portion is lifted, the enlarged diameter portion moves relative to the composite anchor portion in the lifting direction, thereby pushing each of the anchor members radially outward.

[0014] According to the present invention, a suspension device can be easily constructed.

[0015] Furthermore, each outer surface constituting the enlarged diameter portion is formed as a flat surface, and the wedge shaft portion comprises a bolt portion on which a male thread is formed, and the enlarged diameter portion which moves up and down by the rotation of a washer screwed onto the bolt portion, and it is preferable that when the washer rotates, the enlarged diameter portion moves relative to the composite anchor portion in an upward direction, thereby pushing each of the anchor members radially outward.

[0016] When lifting a lifting device with a crane or other lifting machine, the wedge shaft portion is lifted by hand beforehand to bring it into contact with the straight hole, thereby ensuring sufficient contact length. However, when using large lifting devices, the weight makes it difficult to lift the device by hand and fix it in the straight hole. In contrast, the structure of the present invention makes it easy to secure a sufficient contact surface with the straight hole and fix the lifting device, thereby making it easy to lift the object being transported. In addition, the flat cross-section of the diameter-expanded portion has a substantially regular n-sided polygon shape, where n is 4 together with the number of the anchor members, or n is an even number where n ≧ 6, and the number of the anchor members is preferably n × 1 or n × 1 / 2.

[0017] In addition, the shape of the flat cross-section of the diameter-expanded portion and the shape of the inner peripheral surface of the composite anchor portion are substantially the same or substantially similar, and it is preferable that the opposing surfaces contact each other.

[0018] According to the present invention, since stress can be evenly transmitted from the diameter-expanded portion to the entire composite anchor portion in the radially outward direction, stress does not concentrate on a part of the conveyed object, and the block can be lifted without being damaged.

Effect of the Invention

[0019] According to the lifting tool according to the present invention, handling is good, and damage to the lifting tool and the conveyed object can be prevented.

Brief Description of the Drawings

[0020] [Figure 1] It is a side view showing the lifting tool according to the first embodiment of the present invention. [Figure 2] It is a longitudinal sectional view showing the lifting tool according to the first embodiment. [Figure 3] It is a side view showing the wedge shaft portion according to the first embodiment. [Figure 4] It is a bottom view (end face view) showing the wedge shaft portion according to the first embodiment. [Figure 5] It is a side view of the anchor member according to the first embodiment as viewed from the inside. [Figure 6] It is a bottom view showing the anchor member according to the first embodiment. [Figure 7] It is a side view showing the composite anchor portion according to the first embodiment. [Figure 8] It is a bottom view showing the composite anchor portion according to the first embodiment. [Figure 9] It is a model diagram of the lifting tool according to the first embodiment. [Figure 10] This is a table showing the conditions for the suspension device according to the first embodiment. [Figure 11] This is a side view showing the usage state of the suspension device according to the first embodiment. [Figure 12] This is a side view showing a suspension device according to a second embodiment of the present invention. [Figure 13] This is a side view showing the wedge shaft portion according to the second embodiment. [Figure 14] This is a bottom view (end view) showing the wedge shaft portion according to the second embodiment. [Figure 15] This is a side view showing the suspension device according to the second embodiment inserted into a straight hole. [Figure 16] This is a side view showing the usage state of the suspension device according to the second embodiment. [Modes for carrying out the invention]

[0021] Embodiments of the present invention will be described with reference to the drawings as appropriate. The present invention is not limited to the following embodiments. Furthermore, some or all of the components in the embodiments can be combined as appropriate. In addition, the drawings are for conceptual explanation of the present invention, and the dimensions and ratios of each component shown may differ from those of the actual components.

[0022] <First Embodiment> As shown in Figure 1, the lifting device 1 according to the first embodiment comprises a lift section 2, a wedge shaft section 3, a composite anchor section 4, a holder 5, and a ring member 6. The lifting device 1 is a jig used to lift and transport the object T shown in Figure 2. Each component of the lifting device 1, except for the ring member 6, is preferably made of metal, sintered metal, metal-reinforced fiber resin, or thermophotocurable resin, and a high-strength metal component such as steel or stainless steel is more preferable.

[0023] The transported material T is not particularly limited, but is preferably a block-shaped refractory material or concrete, and more preferably a block-shaped carbon. A straight hole S, having one or more substantially cylindrical hollow sections, is formed on the upper surface of the transported material T. The straight hole S is a hole into which the composite anchor section 4 of the lifting device 1 is inserted. The inner diameter of the straight hole S is preferably formed to be slightly larger than the outer diameter of the composite anchor section 4 before lifting. The difference between the inner diameter of the straight hole S and the outer diameter of the composite anchor section 4 is preferably 3 mm or less, and more preferably 2 mm or less.

[0024] The lift section 2 is not particularly limited as long as it is a bolt and nut structure with a ring on the head, and may also be an eye nut, eye bolt, universal link bolt, etc., and is not particularly restricted as long as it is a link part that is locked to the hook of a lifting machine such as a crane and has the following shape with the necessary strength. In this embodiment, the case in which the lift section 2 is an eye nut will be described below. The lift section 2 comprises a base 11 and an annular section 12. The base 11 is a columnar part to which the wedge shaft 3 is connected. When the lift section 2 is an eye nut, a through hole is formed inside the base 11 along the height direction. Furthermore, a screw groove (female thread) is formed on the inner circumferential surface of the through hole, and the head 21 of the wedge shaft 3 is screwed into it. In addition, a pin straight hole 13 that penetrates in the lateral direction is formed in the base 11. The annular section 12 is continuous with the upper part of the base 11 and has a ring shape.

[0025] The wedge shaft portion 3 is a shaft-shaped member that is connected to the lift portion 2 and inserted into the composite anchor portion 4. As shown in Figures 2 and 3, the wedge shaft portion 3 comprises a head portion 21, a neck portion 22, and an enlarged diameter portion 23. The head portion 21 has a pin-straight hole 24 that penetrates horizontally. The outer circumferential surface of the head portion 21 has a screw groove (male thread) that screws into the base portion 11. While screwing the base portion 11 and the head portion 21 together, the pin-straight hole 24 of the head portion 21 and the pin-straight hole 13 of the base portion 11 are connected, and a pin (not shown) is inserted into the pin-straight holes 13 and 24. This prevents the lift portion 2 and the wedge shaft portion from rotating and shifting relative to each other, and as a result, prevents the wedge shaft portion 3 from falling out of the lift portion 2. The base portion 11 may also have a screw groove that screws into the head portion 21.

[0026] The neck portion 22 is thinner than the head portion 21 and is a columnar part that connects the head portion 21 and the enlarged diameter portion 23. The enlarged diameter portion 23 extends downward from the lower end of the neck portion 22 and is a part that widens in diameter as it extends downward. As shown in Figure 4, the planar cross-section of the enlarged diameter portion 23 is approximately a regular octagon in this embodiment. The enlarged diameter portion 23 is formed such that the area of ​​the approximately regular octagon, which forms the planar cross-section, gradually increases from the upper end to the lower end. Each of the outer surfaces (eight surfaces) constituting the enlarged diameter portion 23 is a flat surface. The inclination angle α of the outer surface of the enlarged diameter portion 23 with respect to the axis (central axis) C can be appropriately set in the range of, for example, 0.9° or more and less than 4.3°, preferably in the range of 2.2° or more and less than 4.3°. The design conditions for the suspension device 1 will be described later.

[0027] As shown in Figure 1, the composite anchor section 4 is composed of multiple anchor members 31 having the same shape. The number of anchor members 31 can be set as appropriate, but in this embodiment there are four. Figure 5 is a side view of the anchor member according to the first embodiment, viewed from the inside. As shown in Figure 5, the anchor member 31 is provided with a groove 33 for a holder, grooves 34, 34 for ring members, and a groove 35 for a wedge shaft.

[0028] As shown in Figures 5 to 8, the anchor member 31 is a vertically elongated, roughly columnar member. As shown in Figure 7, the angle σ formed by the side end faces 36, 36 of the anchor member 31 is approximately 90°. The outer circumferential surface of the anchor member 31 has uneven surfaces 39 (see also Figure 1). The uneven surfaces 39 are the parts that come into contact with the hole wall of the straight hole S. The uneven surfaces 39 can be formed as appropriate to improve the frictional force with the hole wall of the straight hole S, but in this embodiment, for example, it is preferable to form them by knurling.

[0029] As shown in Figure 5, the retainer groove 33 is a groove cut out along the outer circumference of the upper part of the anchor member 31. The bottom portion 41 of the retainer 5 (see Figure 2) is inserted into the retainer groove 33. In other words, the retainer groove 33 is the portion that engages with the bottom portion 41 of the retainer 5.

[0030] The ring member groove 34 is a groove cut out along the outer circumference of the upper and lower parts of the anchor member 31. The ring member groove 34 is the part to which the ring member 6 is attached. The upper ring member groove 34 may be above or below the retainer groove 33, but in this embodiment it is formed below.

[0031] The wedge shaft groove 35 is a groove extending vertically along the axis C inside the anchor member 31. The wedge shaft groove 35 is the area where the enlarged diameter portion 23 of the wedge shaft 3 is located. The wedge shaft groove 35 consists of a flat inner surface 35a and flat inner surfaces 35b, 35b formed on both sides of the inner surface 35a. As shown in Figure 6, the inner surfaces 35b, 35b are inclined with respect to the inner surface 35a and are formed in positions symmetrical with respect to the inner surface 35a. The width of the inner surface 35a gradually increases from the top to the bottom. Similarly, the width of the inner surface 35b also gradually increases from the top to the bottom. As shown in Figure 7, the inclination angle β of the inner surface 35a with respect to the axis C is approximately the same as the inclination angle α described above.

[0032] As shown in Figure 7, a composite anchor portion 4 with a roughly cylindrical outer shape is formed by bringing the respective side end faces 36 (see Figure 6) of the four anchor members 31 to face each other. The respective side end faces 36, 36 are either in contact with each other or facing each other with a small gap between them.

[0033] As shown in Figure 8, the four wedge shaft grooves 35 are arranged in a circumferential direction, forming a roughly octagonal hole in the composite anchor portion 4 that gradually widens from top to bottom. More specifically, as shown in Figure 8, the inner surfaces 35b, 35b of adjacent anchor members 31, 31 form a single surface. As a result, the four inner surfaces 35a and the four sets of inner surfaces 35b, 35b form a roughly octagonal hole. Before using the lifting device 1, the eight inner surfaces formed inside the composite anchor portion 4 are either in contact with the outer surfaces of the widened diameter portion 23 of the wedge shaft portion 3, or facing each other with a small gap between them. In other words, at the same height, the planar cross-section of the widened diameter portion 23 and the planar cross-section of the hole in the composite anchor portion 4 are roughly the same shape or roughly similar.

[0034] Furthermore, on the outer surface of the enlarged diameter portion 23, the outer surface that contacts and faces the anchor member 31 and the outer surface located in the gap between the anchor members 31 are arranged alternately. Therefore, the number of faces (number of polygons) of the enlarged diameter portion 23 is equal to or a multiple of the number of anchor members 31.

[0035] As shown in Figure 2, the retainer 5 is a member that engages with the upper part of each anchor member 31. The retainer 5 comprises a bottom portion 41 and a side wall portion 42. The bottom portion 41 is disc-shaped with a through hole 43 formed in the center. The side wall portion 42 is a cylindrical wall portion that rises from the outer edge of the bottom portion 41. The opening edge of the bottom portion 41 enters into the four retainer grooves 33 from the side and engages with them. In other words, the retainer 5 is a member that brings together the upper parts of the four anchor members 31 into one.

[0036] The ring member 6 is elastic and bundles the four anchor members 31 together while allowing slight movement of each anchor member 31 in the radially outward direction. The ring member 6 constantly biases the four anchor members 31 in the axial direction C. As a result, the inner surfaces of the holes in the composite anchor portion 4 are either in contact with the outer surfaces of the enlarged diameter portion 23 or are facing each other with a small gap between them. The ring member 6 is, for example, an O-ring made of rubber or resin. The ring member 6 is disposed in the ring member groove 34. There should be at least two ring members 6 relative to the composite anchor portion 4. In order to keep the composite anchor portion 4 parallel at all times, two or more locations are preferable, and in this embodiment, they are disposed in two locations, the upper and lower parts of the composite anchor portion 4.

[0037] Next, we will explain the design conditions for transporting the conveyed object T without the hole walls of the straight holes S being crushed by the lifting device 1 (i.e., without damage to the conveyed object T). The conveyed object T is exemplified by a carbon block. Furthermore, each component of the lifting device 1, except for the ring component 6, is made of steel. The compressive strength of carbon varies depending on its type, but a typical strength is 24.5 N / mm². 2 Figure 9 is a model diagram of the lifting device according to the first embodiment. Figure 10 is a table showing the conditions for the lifting device according to the first embodiment. Here, the outer diameter Φ of the lifting device 1 is preferably 30 mm or more and 100 mm or less, and more preferably 35 mm or more and 80 mm or less. If the outer diameter Φ is less than 30 mm, it is not possible to lift a sufficient weight. If the outer diameter Φ exceeds 100 mm, a large hole will be made in the transported object, and the corresponding lifting device will also become heavier and difficult to handle. In this embodiment, calculations are made for the cases where the outer diameter Φ is 30 mm, 38 mm, 50 mm, and 80 mm, respectively.

[0038] As shown in Figures 9 and 10, the lifting load (maximum lifting load) W is 4900N for an outer diameter Φ=30mm, 5880N for an outer diameter Φ=38mm, 11760N for an outer diameter Φ=50mm, and 23520N for an outer diameter Φ=80mm. The lifting load (maximum lifting load) of the lifting device 1 can be obtained by a separate pull-out test. The contact circumference length, contact length h, and contact area are as shown in Figure 10. The contact circumference length is the length over which the outer surface of the composite anchor portion 4 contacts the hole wall of the straight hole S, and is calculated by multiplying the outer diameter of the composite anchor portion 4 by pi and subtracting the gap between the side end faces 36, 36. For example, in the case of an outer diameter Φ=38mm, the contact circumference length is calculated as 38 × 3.14 - 2 × 4. The contact length h indicates the length in the height direction of the pressure-receiving portion (height dimension of the enlarged diameter portion 23). The coefficient of friction μ between the suspension device 1 and the carbon block is 0.15.

[0039] If the lifting force (lifting load) is W kg and the force acting on the hole wall of the straight hole S is F, then F = W / (2sinα) (Equation 1). For the lifting device 1 not to fall due to friction with the carbon block, it is necessary to satisfy μF > W (Equation 2). From Equations 1 and 2, the inclination angle α < 4.3°. In other words, if the inclination angle α is 4.3° or greater, the pressing force and frictional force of the composite anchor part 4 pushing against the straight hole S are insufficient, and transport cannot be performed.

[0040] As shown in Figure 10, for example, if the outer diameter Φ of the lifting device 1 is 30 mm, the inclination angle α is 2.86, and the lifting load is 4900 N, the compressive stress acting on the straight hole S is 9.50 N / mm². 2 This is the result. Furthermore, for example, if the outer diameter Φ of the lifting device 1 is 38 mm, the inclination angle is α2.86°, and the lifting load is 5880 N, the compressive stress acting on the straight hole S is 8.68 N / mm². 2 This is the result.

[0041] Furthermore, for example, if the outer diameter Φ of the lifting device 1 is 50 mm, the inclination angle α is 2.86°, and the lifting load is 11760 N, the compressive stress acting on the straight hole S is 7.91 N / mm². 2 This is the result.

[0042] Also, for example, when the outer diameter Φ of the lifting tool 1 is 80 mm, the contact length h is 100 mm, the inclination angle α is 2.86°, and the lifting load is 23520 N, the compressive stress acting on the straight hole S is 9.70 N / mm 2 becomes. Also, for example, when the outer diameter Φ of the lifting tool 1 is 80 mm, the contact length h is 110 mm, the inclination angle α is 2.86°, and the lifting load is 27440 N, the compressive stress acting on the straight hole S is 10.28 N / mm 2 becomes.

[0043] In any of the above cases, since it is less than 24.5 N / mm which is the compressive strength of the carbon block, the carbon block can be transported without being crushed (without being damaged). Conversely, when the compressive stress is 24.5 N / mm 2 , the inclination angles α for outer diameters Φ = 30 mm, 38 mm, 50 mm, and 80 mm are 1.1°, 1.0°, 0.9°, and 1.1° respectively. There is a tendency for the compressive stress to increase as the inclination angle α decreases. Therefore, in the cases of outer diameters Φ = 38 mm, 50 mm, and 80 mm, the inclination angle α is preferably 0.9° or more. If the compressive stress is less than 24.5 N / mm 2 which is the compressive strength of the carbon block, crushing of the carbon block can be suppressed. However, considering safety factors etc., it is preferably 15 N / mm 2 or less, more preferably 10 N / mm 2 or less. The least risky is to operate with a stress that is 1 / 5 or less of the strength of the target block. 2 Next, the usage method of the lifting tool 1 of this embodiment will be described. First, as shown in FIG. 2, the composite anchor portion 4 is inserted into the straight hole S of the conveyed object T. At this time, each outer surface of the enlarged diameter portion 23 of the wedge shaft portion 3 is in contact with or faces each inner surface of the hole portion of the composite anchor portion 4 with a slight gap. Also, the outer peripheral surface of the composite anchor portion 4 is in contact with or faces the hole wall of the straight hole S with a slight gap over the circumferential direction.

[0044]

[0045] ​Next, as shown in Figure 11, when the lifting machine's hook (not shown) is locked to the lift section 2 and the lift section 2 is lifted upward, the wedge shaft section 3 moves relatively upward with the composite anchor section 4 positioned in the straight hole S. At this time, the enlarged diameter section 23 of the wedge shaft section 3 pushes the anchor member 31 outward by several millimeters, causing the outer circumferential surface of the composite anchor section 4 to press radially outward against the hole wall of the straight hole S in the circumferential direction. In other words, the lifting device 1 can lift the conveyed object T with the combined force of the pressing force acting from the inside to the outside of the lifting device 1 and the frictional force between the outer circumferential surface of the composite anchor section 4 and the hole wall of the straight hole S.

[0046] Once the transported object T is placed in the designated position, the wedge shaft portion 3 is moved downward relative to the composite anchor portion 4. As a result, the wedge shaft portion 3 returns to its original position, and the composite anchor portion 4 also shrinks in diameter due to the ring member 6, returning to its original state. This allows the lifting device 1 to be pulled up through the straight hole S.

[0047] As described above, the composite anchor section 4 of the suspension device 1 according to this embodiment is composed of multiple anchor members 31, which are bundled together by ring members 6, 6. In other words, the entire anchor member 31 is divided and the entire composite anchor section 4 is in contact with the outer surface, so stress does not concentrate on a part of the composite anchor section 4, reducing the risk of failure such as cracking. Furthermore, since the composite anchor section 4 is composed of multiple anchor members 31, it can be pushed outward to press against the hole wall of the straight hole S, and the multiple anchor members 31 can be bundled together by the holder 5 and the ring members 6. In other words, since the multiple anchor members 31 are biased in the axial direction C by the ring members 6, the anchor members 31 do not fall apart, making them easy to handle and allowing them to be easily inserted into the straight hole S.

[0048] Furthermore, since the outer surface of the anchor member 31 has protrusions and recesses 39 formed for anti-slip purposes, the frictional force between the composite anchor portion 4 and the hole wall of the straight hole S can be increased, allowing the conveyed object T to be reliably lifted.

[0049] Furthermore, the lift section 2, the wedge shaft section 3, and each anchor member 31 are made of metal, the inclination angle α between the inclined surface (outer surface) of the enlarged diameter section 23 of the wedge shaft section 3 and the axis (central axis) C is 0.9° or more and less than 4.3°, and the compressive stress received by the hole wall of the straight hole S from the anchor member 31 is 10.0 N / mm 2 The following is preferable: The compressive strength of the carbon block is 24.5 N / mm². 2 Therefore, the lifting device 1 can transport the carbon block without crushing it.

[0050] Furthermore, according to this embodiment, each outer surface constituting the enlarged diameter portion 23 is formed as a flat surface, and when the lift portion 2 is lifted, the enlarged diameter portion 23 moves relative to the composite anchor portion 4 in the lifting direction, causing each anchor member 31 to be pushed outward. In other words, in this embodiment, the transported object T can be lifted simply by lifting the lift portion 2, thus reducing the amount of work required. In addition, according to this embodiment, the number of parts is also small, and each component can be easily constructed.

[0051] Furthermore, as in this embodiment, the planar cross-section of the enlarged diameter portion 23 is preferably an n-sided polygon, where n is 4 along with the number of anchor members 31, or n is n≧6 and even, and the number of anchor members 31 is preferably n×1 or n×1 / 2. In this embodiment, n=8, and the number of anchor members 31 is 4. Furthermore, as in this embodiment, it is preferable that the shape of the flat cross-section of the enlarged diameter portion 23 and the shape of the hole portion of the composite anchor portion 4 are substantially the same or substantially similar, and that the opposing surfaces come into contact with each other. According to this embodiment, stress can be transmitted evenly from the enlarged diameter portion 23 to the radially outward side of the composite anchor portion 4, thereby distributing the stress and enabling balanced lifting.

[0052] <Second Embodiment> Next, a lifting device 1A according to the second embodiment of the present invention will be described. The second embodiment mainly differs in that the wedge shaft portion 3A has a screw structure. The second embodiment will be described focusing on the differences from the first embodiment.

[0053] The lifting device 1A of this embodiment comprises a lift section 2A, a wedge shaft section 3A, a composite anchor section 4A, a holder 5A, a ring member 6, a washer 26, and a handle 27.

[0054] The lift section 2A comprises a base section 11 and an annular section 12. Inside the base section 11, a screw groove (female thread) is formed in the vertical direction into which the bolt section 51, described later, is screwed. The lift section 2A may also be an eyebolt shape, integrally structured with the bolt section 51.

[0055] As shown in Figures 12 and 13, the wedge shaft portion 3A comprises a washer 26, a handle 27, a bolt portion 51, and an enlarged diameter portion 52. The washer 26 is disc-shaped, with a screw groove (female thread) running vertically through the center into which the bolt portion 51 is screwed. The handles 27 are formed on both sides of the washer 26, each protruding laterally.

[0056] The bolt portion 51 is a cylindrical member with screw grooves (male threads) on its outer circumference extending vertically. The bolt portion 51 is screwed onto the base portion 11, the washer 26, and the enlarged diameter portion 52 described later. The base portion 11 and the washer 26 are screwed onto the bolt portion 51 independently. In this second embodiment, the enlarged diameter portion 52 is a cylindrical member that is screwed onto the bolt portion 51 and is separate from the bolt portion 51, but it may be an integrated structure as long as the lift portion 2A is not eyebolt shaped. The enlarged diameter portion 52 has screw grooves (female threads) formed on the inner circumference of a through hole that penetrates in the height direction. The outer circumference of the enlarged diameter portion 52 has a configuration that is generally the same as that of the enlarged diameter portion 23 in the first embodiment. That is, as shown in Figure 14, the enlarged diameter portion 52 has a roughly regular octagonal cross-section and its diameter widens towards the bottom.

[0057] As shown in Figure 12, the retainer 5A is a ring-shaped member disposed around the upper part of the anchor member 31. The retainer 5A is disposed in a retainer groove 33 formed along the outer circumference of the upper part of the anchor member 31. The retainer 5A engages with the upper part of each anchor member 31 and is a member that brings together the divided anchor members 31 into one.

[0058] In this embodiment, the ring members 6 are provided at five locations on the outer circumference of the anchor member 31, spaced apart in the height direction. Each ring member 6 is positioned in a ring member groove 34.

[0059] Next, the method of using the lifting device 1A of this embodiment will be described. First, as shown in Figure 15, the composite anchor portion 4A is inserted into the straight hole S of the transported object T. At this time, the outer surface of the enlarged diameter portion 52 of the wedge shaft portion 3A is in contact with the inner surface of the hole portion of the composite anchor portion 4A, or is facing it with a small gap between them. The outer circumferential surface of the composite anchor portion 4A is in contact with the straight hole S, or is facing it with a small gap between them in the circumferential direction.

[0060] Next, the handles 27, 27 are grasped and rotated around the axis C. By rotating the handles 27, 27 along the screw axis, the washer 26 comes into contact with the upper surface of the transported object T, the bolt portion 51 is lifted, and the enlarged diameter portion 52 is pulled up as a result. At this time, the outer surface of the enlarged diameter portion 52 is in contact with the inner surface of the hole portion of the composite anchor portion 4A, and therefore does not rotate around the axis C. As a result, the enlarged diameter portion 52 moves relatively upward with respect to the composite anchor portion 4A. At this time, the enlarged diameter portion 52 of the wedge shaft portion 3A widens the anchor member 31 from the inside to the outside by less than 1 mm, so the outer surface of the composite anchor portion 4A presses radially outward along the circumferential direction against the hole wall of the straight hole S. As a result, the lifting device 1A is set on the transported object T.

[0061] Furthermore, as shown in Figure 16, as the lift section 2A is lifted while the hook of the lifting machine (not shown) is locked to the lift section 2A, the wedge shaft section 3A is lifted, and the enlarged diameter section 52 further presses the anchor member 31 radially outward. In other words, the lifting device 1A can lift the conveyed object T with the combined force of the pressing force acting from the inside to the outside of the lifting device 1A and the frictional force between the outer surface of the composite anchor section 4A and the hole wall of the straight hole S.

[0062] Once the object T is placed in the designated position, the handle 27 is rotated in the opposite direction to when lifting to move the enlarged diameter portion 52 downward relative to the composite anchor portion 4A. This causes the wedge shaft portion 3A to return to its original position, and the composite anchor portion 4A also shrinks in diameter and returns to its original state. This allows the lifting device 1A to be withdrawn from the straight hole S.

[0063] The lifting device 1A according to this embodiment described above can achieve generally the same effects as the first embodiment. Furthermore, in the lifting device 1A, the wedge shaft portion 3A (consisting of a bolt portion 51 and an enlarged diameter portion 52) is equipped with a bolt portion 51 and an enlarged diameter portion 52 that screws onto the bolt portion 51. Therefore, the enlarged diameter portion 52 can be raised and lowered relative to the composite anchor portion 4A by the feed screw action of both. This makes it easy to secure a sufficient contact surface with the straight hole S and fix the lifting device 1A, and as a result, the transported object T can be easily lifted.

[0064] Although embodiments of the present invention have been described above, the invention is not limited to the above-described forms, and the design can be modified as appropriate within the scope of the spirit of the invention. For example, in this embodiment, an eye nut was used as the lift portion 2, but an eye bolt or a universal link bolt may also be used. In the case of a universal link bolt, the annular portion 12 is rotatable at least around the axis C. [Explanation of symbols]

[0065] 1. Lifting device 2. Lift section 3. Wedge shaft 4. Composite anchor section 5 Holder 6 Ring Member 11 Base 12 Ring section 21 Head 22 Neck 23 Expanded diameter part 31 Anchor member S Straight Hole T Conveyed object

Claims

1. A lifting device for lifting a conveyed object having a straight hole formed therein, The lifting section and A wedge shaft portion connected to the lift portion and having an enlarged diameter portion that expands in a direction away from the lift portion, A composite anchor portion having a plurality of anchor members arranged around the enlarged diameter portion, The system comprises a ring member that bundles the plurality of anchor members together, When the wedge shaft portion moves relative to the other in the lifting direction, the enlarged diameter portion pushes each of the anchor members radially outward, and the outer surface of the composite anchor portion presses against the hole wall of the straight hole. The lifting device is characterized in that the flat cross section of the enlarged diameter portion is an approximately regular n-sided polygon, where n is 4 along with the number of anchor members, or n is n ≥ 6 and an even number, and the number of anchor members is n × 1 or n × 1 / 2.

2. The lifting device according to claim 1, characterized in that the outer circumferential surface of the anchor member has protrusions and recesses formed thereon to improve the frictional force with the hole wall of the straight hole.

3. The lift section, the wedge shaft section, and each of the anchor members are made of metal. The inclination angle α between the axial central axis of the wedge shaft and the outer surface of the enlarged diameter portion is 0.9° or more and less than 4.3°, and the compressive stress received by the hole wall of the straight hole from the anchor member is 10 N / mm². ２ The suspension device according to claim 1 or 2, characterized in that it is as follows:

4. Each outer surface constituting the enlarged diameter portion is formed as a flat surface. The lifting device according to any one of claims 1 to 3, characterized in that when the lift section is lifted, the enlarged diameter section moves relative to the composite anchor section in the lifting direction, thereby pushing each of the anchor members outward in the radial direction.

5. The lifting device according to claim 1, characterized in that the shape of the flat cross-section of the enlarged diameter portion and the shape of the inner circumferential surface of the composite anchor portion are substantially the same or substantially similar, and the opposing surfaces are in contact with each other.

6. Each outer surface constituting the enlarged diameter portion is formed as a flat surface. The wedge shaft portion comprises a bolt portion on which a male thread is formed, and an enlarged diameter portion that moves up and down by the rotation of a washer screwed onto the bolt portion. The lifting device according to any one of claims 1 to 5, characterized in that when the washer rotates, the enlarged diameter portion moves relative to the composite anchor portion in the lifting direction, thereby pushing each of the anchor members outward in the radial direction.

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