Heavy object handling equipment

Abstract

To provide a heavy object handling device which has a simple structure and can be operated in all weathers without being affected by rain or snow.SOLUTION: An arm mechanism 4 and a balancing mechanism 5 are hung between a pillar 2 which can swivel in a direction intersecting an axial direction, and a lifting arm 3 which lifts a heavy object 7. The arm mechanism 4 has a first arm 11 and a second arm 12 that are pivotably connected to each other. The first arm 11 is pivotably attached to the pillar 2, and the second arm 12 is pivotably connected to the lifting arm 3. The balancing mechanism 5 includes: a tension coil spring 17 whose one end is connected to the pillar 2; a first wire 18 stretched between a first reel 21 and the second arm 12 rotatably provided on the pillar 2; and a second wire 19 stretched between the other end of the tension coil spring 17 and a second reel 24 rotatably provided on the lifting arm 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a heavy object handling device for moving heavy objects such as boring rods and sheet piles to designated positions at a construction site, and in particular to an all-weather handling device that can be operated regardless of weather conditions such as rain or snow. [Background technology]

[0002] Patent Document 1 discloses a conventional handling device for transporting heavy objects such as rebar to a predetermined position on a construction site. This handling device includes a base swivel, a first arm rotatably attached to the base swivel, an elbow swivel rotatably attached to the first arm, a second arm rotatably attached to the elbow swivel, a gripper attached to the tip of the second arm for gripping the heavy object, and an operating member for rotating the gripper horizontally and vertically.

[0003] Conventional handling devices reduce the weight burden on workers by having the worker bear the weight of the heavy object by gripping it with a gripper. To rotate the gripper, conventional handling devices are equipped with a power source such as an electric motor or hydraulic motor inside the first arm or second arm. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-20432 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional handling devices require the incorporation of a power source, such as electric power or hydraulic power, to rotate the gripper that holds the heavy load. This not only makes the structure complex, but also requires the mutual adjustment of the power sources, resulting in problems such as reduced operability. Furthermore, rain or snow can have a negative effect on the power source, making it impossible to operate the device.

[0006] The present invention has been made to solve such conventional problems, and has as its object to provide a heavy load handling device which has a simple structure and can be operated in all weather conditions without being affected by rain or snow. [Means for solving the problem]

[0007] The heavy object handling device of the present invention comprises an arm mechanism and a balancing mechanism suspended between a support pillar that can rotate in a direction intersecting the axial direction and a lifting arm that lifts a heavy object, the arm mechanism comprising a first arm and a second arm that are rotatably connected to each other, the first arm being rotatably attached to the support pillar and the second arm being rotatably connected to the lifting arm, and the balancing mechanism comprising a tension coil spring having one end connected to the support pillar, a first wire suspended between a first reel rotatably attached to the support pillar and the second arm, and a second wire suspended between the other end of the tension coil spring and a second reel rotatably attached to the lifting arm.

[0008] In the present invention, a large gear and a small gear that are meshed with each other are attached to the lifting arm, the second reel is attached to the large gear, and a lifting lever is attached to the small gear, and the small gear rotates when the lifting lever is operated. [Effects of the Invention]

[0009] According to the present invention, the tension coil spring stretches to balance the load of the heavy object 9, so that the heavy object can be handled with a small operating force, resulting in a handling device with a simple structure that allows for good operation. Furthermore, since electric or hydraulic power is not required to handle the heavy object, handling is possible in all weather conditions, unaffected by rain or snow. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a front view showing the entirety of a heavy object handling device according to an embodiment of the present invention; [Figure 2] 10 is a schematic diagram showing the movement of the first wire caused by the payout operation. FIG. [Figure 3] 4 is a schematic diagram illustrating the movement of the first wire caused by the winding operation. FIG. [Figure 4] 4 is a front view showing the operation of hanging a heavy object on the lifting hook after the operation of FIGS. 2 and 3. FIG. [Figure 5] 4 is a front view showing the operation of hanging a heavy object on the lifting hook after the operation of FIGS. 2 and 3. FIG. [Figure 6] 4 is a front view showing the operation of hanging a heavy object on the lifting hook after the operation of FIGS. 2 and 3. FIG. [Figure 7] 4 is a front view showing the operation of hanging a heavy object on the lifting hook after the operation of FIGS. 2 and 3. FIG. [Figure 8] 10A and 10B are front views showing the operation of lifting a heavy load. [Figure 9] FIG. 10 is a front view showing the range of motion when lifting a heavy object. [Figure 10] (A) and (B) are side views showing application to a boring rod. [Figure 11] This is a front view showing the lifting state when the boring rod is a double pipe. [Figure 12] FIG. 10 is a partially cutaway front view showing an example of a pivoting mechanism for a support column. DETAILED DESCRIPTION OF THE INVENTION

[0011] 1 shows the entirety of a heavy load handling device 1 (hereinafter referred to as handling device 1) according to one embodiment of the present invention. The handling device 1 includes a support 2, a lifting arm 3, and an arm mechanism 4 and a balancing mechanism 5 that are suspended between the support 2 and the lifting arm 3.

[0012] The support pillars 2 are erected on a self-propelled moving device 6, and when the moving device 6 moves to a work location such as a construction site, the support pillars 2 move together with the moving device 6, and the entire handling device 1 moves accordingly. The lifting arm 3 is a member for lifting a heavy load 7 such as a boring rod or a sheet pile, and has a lifting hook 8 for lifting the heavy load 7 attached to its lower end.

[0013] The arm mechanism 4 includes a first arm 11 and a second arm 12 that are rotatably connected to each other by a connecting hinge 9. The first arm 11 extends from the connecting hinge 9 toward the support column 2, and its extended end is rotatably connected to a support column-side hinge 13 that is attached to a longitudinal intermediate portion of the support column 2. The first arm 11 extends toward the second arm 12. The second arm 12 extends from the connecting hinge 9 toward the lifting arm 3. An arm-side hinge 14 is attached to the extended end of the second arm 12, and the lifting arm 3 is rotatably connected to this arm-side hinge 14.

[0014] The balancing mechanism 5 is a mechanism that balances the weight of the heavy load 7 by the spring force of the tension coil spring 17. The balancing mechanism 5 includes the tension coil spring 17, a first wire 18, and a second wire 19. The end of the tension coil spring 17 on the support pillar side is engaged with a spring-side hinge 20 provided on the upper part of the support pillar 2 and extends from the hinge 20.

[0015] The first wire 18 is provided between the support post 2 and the second arm 12. The end of the first wire 18 on the support post 2 side is wound around a first reel 21 provided on the support post 2, and is wound onto and unwound from the first reel 21 as the first reel 21 rotates. The first reel 21 is provided with an adjustment lever 22 that is operated by an operator, and operation of the adjustment lever 22 causes the first reel 21 to rotate. The end of first wire 18 on the second arm side is connected to second arm 12. This connection is made by being locked to a locking hinge 23 provided at the longitudinal end of second arm 12. This first wire 18 is arranged so as to pass through tension coil spring 17, and in this penetrated state, first wire 18 is hung between first reel 21 and the second arm.

[0016] The second wire 19 is connected to the other end (extended end) 17a of the tension coil spring 17 and is arranged along the second arm 12, thereby extending toward the lifting arm 3. A second reel 24 is rotatably provided on the lifting arm 3, and the second wire 19 is wound around this second reel 24. As the second reel rotates, the second wire 19 is wound onto and unwound from the second reel 24. As described above, the second wire 19 is stretched between the tension coil spring 17 and the second reel 24.

[0017] A large gear 27 and a small gear 28 that mesh with each other are disposed on the lifting arm 3. The second reel 24 is attached to the large gear 27 and rotates together with the large gear 27. A lifting lever 29 is attached to the small gear 28, and operation of the lifting lever 29 causes the small gear 28 to rotate, which in turn causes the large gear 27 to rotate. By providing the small gear 28 with the large gear 27 and the lifting lever 29 in this way, it is possible to rotate the second reel 24 with a small operating force.

[0018] Reference numeral 30 denotes a turning mechanism for turning the support column 2. A known structure such as a swivel mechanism can be used as the turning mechanism 30. Fig. 12 shows an example of the turning mechanism 30, but the present invention is not limited to this. 12, the support column 2 is formed by a pipe-shaped lower support column 2a erected on the moving device 6, and an upper support column 2b inserted into the lower support column 2a from above. The upper support column 2b is formed with a flange portion 2c that protrudes outward, and the flange portion 2c is in contact with the upper end surface of the lower support column 2a. In this structure, the upper support column 2b rotates when a rotation force is applied, causing the upper support column 2b (support column 2) to rotate in a direction intersecting the axial direction. By providing such a swivel mechanism 30, the support column 2 can be swiveled in a direction intersecting the axial direction, and the heavy load 7 can be swiveled around the support column 2, facilitating movement of the heavy load 7 around the support column 2 and improving operability at the work site. In addition, since no bearings or the like are used, handling is possible in all weather conditions.

[0019] Spring-type shock absorbers 31, 32 are hung between the support column 2 and the first arm 11 and between the first arm 11 and the second arm 12, making it possible to suppress the oscillation caused by the tension coil spring 17. The shock absorbers 31, 32 may be omitted if not necessary.

[0020] 2 and 3 schematically show the operation of this embodiment. Fig. 2 shows the operation in the direction (rightward) moving the suspension hook 8 away from the support column 2, and Fig. 3 shows the operation in the direction (leftward) moving the suspension hook 8 toward the support column 2. In these figures, reference numerals 11(1), 12(1), 17(1), and 19(1) denote the reference positions of the first arm 11, the second arm 12, the tension coil spring 17, and the second wire 19, respectively, before the operation. Reference numerals 11(2), 12(2), 17(2), and 19(2) in Fig. 2 denote the positions to which the first arm 11, the second arm 12, the tension coil 17, and the second wire 19 have moved after the operation. Reference numerals 11(3), 12(3), and 17(3) in Fig. 3 denote the positions to which the first arm 11, the second arm 12, the tension coil 17, and the second wire 19 have moved after the operation. Furthermore, θ1 is the angle that first arm 11 makes with the horizontal line, and θ2 is the angle that first arm 11 makes with second arm 12.

[0021] In Figure 2, the first wire 18 is unwound from the first reel 21 by operating the adjustment lever 22 relative to the reference position. Unwounding of the first wire 18 causes the first arm 11 to rotate clockwise about the pillar-side hinge 13 and move from the reference position 11(1) to position 11(2). Accordingly, the second arm 12 moves from the reference position 12(1) to position 12(2), and the lifting hook 8 (see Figure 1) of the lifting arm 3 connected to the second arm 12 moves downward and to the right, moving away from the pillar 2. This allows the position and height of the lifting hook 8 to be adjusted to match the weight 7.

[0022] In Figure 3, the first wire 18 is wound onto the first reel 21 by operating the adjustment lever 22 relative to the reference position. By winding the first wire 18, the first arm 11 rotates counterclockwise around the pillar-side hinge 13 and is displaced from the reference position 11(1) to position 11(3). In response to this, the second arm 12 moves from the reference position 12(1) to position 12(3), and the lifting hook 8 (see Figure 1) of the lifting arm 3 connected to the second arm 12 moves upward and leftward, and is drawn to the pillar 2. This allows the position and height of the lifting hook 8 to be adjusted to match the weight 7.

[0023] 2 and 3, the lifting hook 8 can be moved to a position where the heavy load 7 can be lifted. FIGS. 4 to 7 show the operation of adjusting the height of the lifting hook 8 to the position of the heavy load 7, following on from FIGS. 2 and 3.

[0024] The solid line in Figure 4 shows a state in which the angle θ1 of the first arm 11 with the horizontal line is approximately 20°, and the angle θ2 between the first arm 11 and the second arm is approximately 110°, and in this state, the second arm 12 is moved as shown by the chain line by winding or unwinding the first wire 18. This aligns the lifting hook 8 with the height position of the heavy load 7 and hangs the heavy load 7. Similarly, the solid line in Figure 5 indicates a state where θ1 is approximately 30° and θ2 is approximately 100°, the solid line in Figure 6 indicates a state where θ1 is approximately 45° and θ2 is approximately 90°, and the solid line in Figure 7 indicates a state where θ1 is approximately 55° and θ2 is approximately 90°.In these solid line states, the first wire 18 is wound or unwound, and the hanging hook 8 is moved as shown by the dotted line to align it with the height position of the heavy load 8, thereby hanging the heavy load 7.

[0025] FIG. 8 shows the operation of lifting up the heavy load 7 after the lifting hook 8 has been hooked onto the heavy load 7 through the operations shown in FIGS. The solid line state in Figure 8(A) is the state in which the lifting hook 8 is hooked onto the heavy load 7, and in this state, the lifting lever 29 is operated to wind the second wire 19 onto the second reel 24. This winding causes the second arm 12 to rotate counterclockwise and lift the heavy load 7. When the heavy load 7 is lifted, the weight of the heavy load 7 is applied to the second wire 19, stretching the tension coil spring 17, causing the second arm 12 to rotate clockwise and lowering the heavy load 7. Figure 8(B) shows this state.

[0026] In the state shown in FIG. 8(B), the second wire 19 is further wound onto the second reel 24. This causes the heavy load 7 to be lifted. In this state, the weight of the heavy load 7 is balanced by the extension of the tension coil spring 17. This allows the lifting lever 29 to be operated up and down and left and right with a light force to move the heavy load 7. In this way, the weight of the heavy load 7 is balanced by the extension of the tension coil spring 17, and therefore the weight of the heavy load 7 can be canceled out, making it possible to easily handle the heavy load 7 with a small force.

[0027] 9 shows the range in which the tension coil spring 17 can balance the load of the heavy load 7, and in the hatched range S1, the heavy load 7 can be moved with a feeling close to zero gravity. Range S2 outside range S1 shows the range in which the heavy load 7 can be moved by operating with a small force.

[0028] 10 and 11 show an example of a structure for lifting a boring rod 40 as a heavy object. FIG. 10 shows a rod holder 41 that holds a boring rod 40. The rod holder 41 has a pair of chuck levers 42, 43 that are openably and closably attached to a hook receiver 44, and a lock pin 45 that locks the pair of chuck levers 42, 43. A lifting hook 8 is detachably hooked to the receiver hook 44. As shown in FIG. 10(A), the boring rod 40 is inserted between the chuck levers 42, 43, and the chuck levers 42, 43 are closed to hold the boring rod 40. The boring rod 40 is then held by closing the chuck levers 42, 43 with the lock pin 45. This allows the boring rod 40 to be lifted by the lifting hook 8. After that, the lifting lever 29 is operated to rotate the support column by the rotation mechanism 30, and the first arm 11 and the second arm 12 shown in FIGS. 2 and 3 are operated to move the boring rod 40 to the drill head (not shown) of the drilling machine.

[0029] 11 shows the lifting structure when the boring rod 40 is a double pipe consisting of an inner rod 46 and an outer rod 47. A fall prevention device 48 is attached to the part of the inner rod 46 that protrudes from the outer rod 47, and the fall prevention device 48 and the rod holder 41 are connected by a connecting cable 49. This makes it possible to prevent the inner rod 46 from falling off even if the boring rod 40 tilts when being lifted.

[0030] According to the present invention, the tension coil spring 19 is configured to stretch to balance the load of the heavy load 7, thereby balancing the load of the heavy load 9, so that the heavy load can be handled with a small operating force. This results in a handling device with a simple structure that allows for good operation. Furthermore, since electric or hydraulic power is not required to handle heavy loads, handling is possible in all weather conditions, unaffected by rain or snow. [Explanation of symbols]

[0031] 1 Handling equipment 2 pillars 3 Lifting Arm 4 Arm mechanism 5. Balancing mechanism 6. Mobile Devices 7 Heavy objects 8 Hanging hook 9 Connecting hinge 11 First Arm 12 Second Arm 13 Pillar side hinge 14 Arm side hinge 17 Tension coil spring 18 First Wire 19 Second wire 20 21 Reel 1 22 Adjustment lever 23 Locking hinge 27 Large Gear 28 Small gear 29 Lifting lever 30 Swivel mechanism 31 32 Shock absorber

Claims

1. An arm mechanism and a balancing mechanism are suspended between a support column that can rotate in a direction intersecting the axial direction and a lifting arm that lifts a heavy object, the arm mechanism includes a first arm and a second arm that are pivotally connected to each other, the first arm being pivotally attached to the support column, and the second arm being pivotally connected to the lifting arm; The balancing mechanism comprises a tension coil spring having one end connected to the support, a first wire stretched between a first reel rotatably mounted on the support and the second arm, and a second wire stretched between the other end of the tension coil spring and a second reel rotatably mounted on the lifting arm.

2. A heavy object handling device as described in claim 1, characterized in that a large gear and a small gear that are meshed with each other are attached to the lifting arm, the second reel is attached to the large gear, and a lifting lever is attached to the small gear, and the small gear rotates when the lifting lever is operated.

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