Rotating device

Abstract

To achieve a large rotation angle with a simple configuration in a rotation device for rotating a rotation part in an attachment of a construction machine.SOLUTION: The rotation device 10 includes a hydraulic cylinder 11 and a power transmission unit 12 that transmits power generated by the hydraulic cylinder 11 as a rotational force. The power transmission unit 12 includes the crank 14 in which the turn-back portion side 14a is provided from the one end side 14c to the other-end side 14b and the one end side 14a is rotatably attached to one of the unit portion and the rotation portion, and the link 15 in which the one end side 15a is rotatably connected to the other-end side 14c of the crank 14 and which extends from the connection point to the same side as the side from the turn-back portion side 14b to the other-end side 14c in the crank 14. A 15b part on the other end side of the link 15 is rotatably attached to the other of the unit part and the rotating part, and a rod 11b part of the hydraulic cylinder 11 is rotatably attached to a position near one end of the crank 14.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a rotation device or the like provided on an attachment of a construction machine. [Background technology]

[0002] In construction machinery, a rotation device that rotates a rotatable part is sometimes provided on an attachment connected to the tip of an arm, etc. Patent Document 1 describes an attachment for a work machine equipped with this type of rotation device.

[0003] Specifically, the work machine attachment described in Patent Document 1 includes a frame that supports a pair of arms for breaking concrete, etc., and a bracket that rotatably supports the frame, with the frame and bracket connected via a swivel bearing. A hydraulic motor is attached to the bracket. An outer bearing ring is also provided on the bracket, and an inner bearing ring is provided on the frame. When pressure oil is supplied to the hydraulic motor, the hydraulic motor begins to drive, causing the pinion to rotate. Then, driving force is transmitted from the pinion to a gear formed on the inner bearing ring of the frame, causing the frame to rotate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4996852 Summary of the Invention [Problem to be solved by the invention]

[0005] While conventional rotating devices are capable of rotating freely in response to the rotation of a hydraulic motor, they require multiple gears to transmit the driving force of the hydraulic motor and a swivel joint on the rotating shaft. In response to these problems, the inventors of the present application came up with the idea of ​​a simple rotating device that uses a hydraulic cylinder.

[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a rotating device that rotates a rotating part that is freely rotatable in an attachment of a construction machine, while achieving a large rotation angle with a simple configuration. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, a first invention is a rotation device used in an attachment to which an arm of a construction machine is connected, the attachment comprising a unit part and a rotation part rotatably attached to the unit part, the rotation device comprising a hydraulic cylinder and a power transmission part that transmits power generated by the advancement and retreat of the rod of the hydraulic cylinder to the unit part as a rotational force that rotates the rotation part, the power transmission part having a folded part from one end to the other end, one end side of which is rotatably attached to one of the unit part and the rotation part. and a link having one end rotatably connected to the other end of the crank and extending from the connection point to the same side of the crank as the side from the folded portion to the other end, the other end of the link being rotatably attached to the other of the unit part and the rotating part, and the rod of the hydraulic cylinder being rotatably attached at a position near one end of the crank, and as the rod advances or retreats, a force is applied to rotate the crank and link around one end of the crank, thereby rotating the rotating part relative to the unit part.

[0008] In a second aspect of the present invention, in the first aspect of the present invention, the power transmission section is configured to be able to rotate the rotating section by 180 degrees or more relative to the unit section as the rod advances or retreats.

[0009] The third invention is the first or second invention, wherein the unit part is a unit having an arm connection part to which the arm is connected, and the rotating part is the main body part of the attachment, which rotates the main body part relative to the connection part as the rod advances or retreats.

[0010] The fourth invention is the first or second invention, wherein the unit part is the main body part of the attachment, and the rotating part is a rotating member that is rotatably mounted relative to the main body part, and rotates the rotating member relative to the main body part as the rod advances or retreats. [Effects of the Invention]

[0011] In the present invention, the power transmission unit that transmits the power generated by the hydraulic cylinder includes a crank and a link. The crank has a turn-back portion from one end to the other end. One end of the link is rotatably connected to the other end of the crank, and extends from the connection point on the same side of the crank as the side from the turn-back portion to the other end. In the crank and link that are connected to each other, one end of the crank is rotatably attached to one of the unit unit and the rotating unit, and the other end of the link is rotatably attached to the other of the unit unit and the rotating unit. The hydraulic cylinder rod is rotatably attached to a position near one end of the crank.

[0012] With these configurations, in the power transmission mechanism, when power is transmitted from the rod to a position near one end of the crank as the rod advances or retreats, a rotational force centered on one end of the crank is transmitted from the other end of the link. In the crank and link, the distance from the rod's mounting point to the point where the rotational force is transmitted is longer than the distance from the center of rotation to the rod's mounting point. Therefore, a single hydraulic cylinder can rotate the rotating part by a large angle relative to the unit part. According to the present invention, a rotation device capable of large-angle rotation can be realized with a simple configuration. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing a construction machine to which an attachment equipped with a rotation device according to an embodiment is attached. [Figure 2]FIG. 2(A) is a front view of the portal frame of the attachment according to the embodiment in an unfolded state, and FIG. 2(B) is a front view of the portal frame of the attachment in a folded state. [Figure 3] Figure 3(A) is a front view of the hanging part of the attachment according to the embodiment, Figure 3(B) is a side view of the inside of the hanging part, and each of Figures 3(C) to (E) is a diagram for explaining the operation of the gripping device in accordance with the advancement and retreat of the rod of the hydraulic cylinder. [Figure 4] 4(A) is a top view of the rotation device of the attachment according to the embodiment, and FIG. 4(B) is a view of the rotation device of FIG. 4(A) as seen from the position AA. [Figure 5] 5(A) to 5(C) are diagrams for explaining the operation of the rotation device of the attachment according to the embodiment. [Figure 6] 6(A) and 6(B) are diagrams for explaining the operation of the attachment tilting device according to the embodiment. [Figure 7] FIG. 7(A) is a side view of an attachment according to a first modified example of the embodiment, and FIG. 7(B) is a top view of the attachment of FIG. 7(A). [Figure 8] FIG. 8 is a diagram showing a construction machine to which an attachment equipped with a rotation device according to a second modified example of the embodiment is attached. [Figure 9] FIG. 9(A) is a front view of an attachment according to a second modified example of the embodiment, and FIG. 9(B) is a side view of the attachment of FIG. 9(A). [Figure 10] FIG. 10(A) is a front view of a rotation device of an attachment according to a second modified example of the embodiment, and FIG. 10(B) is a top view of the rotation device of FIG. 10(A). [Figure 11] 11(A) to 11(D) are diagrams for explaining the operation of the rotation device for an attachment according to the second modified example of the embodiment. [Figure 12]Figure 12 is a front view of an attachment according to a second variant of the embodiment, in which the orientation of the hydraulic cylinder of the rotating device is changed, with Figure 12(A) showing the gripping device 220 in an open state and Figure 12(B) showing the gripping device 220 in a closed state. [Figure 13] FIG. 13(A) is a side perspective view of the inside of a bucket in an attachment according to a third modified example of the embodiment, and FIG. 13(B) is a front view of the attachment in FIG. 13(A). [Figure 14] 14(A) to 14(D) are diagrams for explaining the operation of the rotation device for an attachment according to the third modified example of the embodiment. [Figure 15] 15(A) to 15(D) are diagrams for explaining how to use the attachment according to the third modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following embodiments are merely examples of the present invention and are not intended to limit the scope of the present invention, its applications, or its uses.

[0015] This embodiment is a rotation device (swivel device) 10 according to the present invention. The rotation device 10 is provided on an attachment 2 of a construction machine 1 shown in FIG. 1. The attachment 2 includes a unit section 7, a rotation section 8 rotatably provided on the unit section 7, and a rotation device 10 that rotates the rotation section 8 relative to the unit section 7. The rotation device 10 is configured so that the rotation section 8 can be rotated 180 degrees or more relative to the unit section 7 as the rod 11b of a hydraulic cylinder 11, which will be described later, advances or retreats. The upper limit of the rotatable angle can be set, for example, between 180 degrees and 200 degrees.

[0016] In this embodiment, the attachment 2 is a device that grips a pipe material 80 such as a steel pipe as an object to be gripped. A construction machine 1 equipped with the attachment 2 can lay pipe materials (water pipes, gas pipes, etc.).

[0017] [About attachments] As shown in Figure 2(A), the attachment 2 includes a portal frame 20 having a portal shape, a pair of gripping devices 30 provided on the portal frame 20, an arm connecting section 23 having a connecting structure 23a for connecting to the arm 6 and supporting the portal frame 20 from above, a swivel rotation mechanism 22 connecting the arm connecting section 23 and the portal frame 20 so as to be rotatable about a vertical rotation axis, and a rotation device 10 for rotating the portal frame 20. In this embodiment, the unit section 7 is a unit having the arm connecting section 23, and the rotation section 8 is a main body section of the attachment 2 having the portal frame 20 (a section that performs the main function of the attachment 2).

[0018] The attachment 2 is also configured to allow the portal frame 20 to swing. The attachment 2 further includes a tilting rotation mechanism 21 that connects the portal frame 20 to the arm connector 23 so that it can swing freely around a horizontal rotation axis as a fulcrum, and a tilting device 25 that tilts the portal frame 20 relative to the arm connector 23 by rotating the portal frame 20 around the horizontal rotation axis. The tilting rotation mechanism 21 is provided on the portal frame 20 side of the swivel rotation mechanism 22. The tilting rotation mechanism 21 connects the portal frame 20 to the arm connector 23 and the swivel rotation mechanism 22 so that it can swing freely around the horizontal rotation axis as a fulcrum.

[0019] The swiveling rotation mechanism 22 is a bearing having an inner ring 22a fixed to the arm connecting portion 23, an outer ring 22b fixed to the tilting rotation mechanism 21, and rolling elements provided between the inner ring 22a and the outer ring 22b. The rotation axis of the inner ring 22a relative to the outer ring 22b corresponds to the vertical rotation axis described above. The inner ring 22a is fixed to the arm connecting portion 23 via a cylindrical connecting member 19 with a bottom. The inner ring 22a is held inside the outer ring 22b.

[0020] The tilting rotation mechanism 21 includes a first fixed member 21a fixed to the lower surface of the outer ring 22b, a second fixed member 21b fixed to the upper surface of an upper connection part 32 (described later) of the portal frame 20, and a pin member 21c that rotatably connects the first fixed member 21a and the second fixed member 21b. The axis of the pin member 21c corresponds to the above-mentioned lateral rotation axis.

[0021] 2(A), portal frame 20 includes a pair of hanging parts 31a, 31b, each having a gripping device 30 attached thereto, and upper connection part 32 connecting the upper parts of pair of hanging parts 31a, 31b. Pair of hanging parts 31a, 31b includes first hanging part 31a provided at one end side of upper connection part 32, and second hanging part 31b provided at the other end side of upper connection part 32.

[0022] Portal frame 20 is configured so that pair of hanging portions 31a, 31b can be folded inward. Portal frame 20 further includes first support portion 33 provided on one end side (the right side in FIG. 2(A)) of upper connecting portion 32 and rotatably supporting first hanging portion 31a, and second support portion 34 provided on the other end side of upper connecting portion 32 and rotatably supporting second hanging portion 31b.

[0023] First support portion 33 is a pair of plate-like members protruding downward from one end of upper connection portion 32, is provided so as to sandwich the upper part of first hanging portion 31a from the front and rear, and rotatably supports first rotation shaft 41 provided in first hanging portion 31a. Second support portion 34 is a pair of plate-like members protruding downward from the other end of upper connection portion 32, is provided so as to sandwich the upper part of second hanging portion 31b from the front and rear, and rotatably supports second rotation shaft 42 provided in second hanging portion 31b. Second rotation shaft 42 is provided below first rotation shaft 41.

[0024] Portal frame 20 can be switched from the unfolded state shown in Fig. 2(A) to the folded state shown in Fig. 2(B) by rotating first hanging portion 31a inward about first rotation shaft 41 as a fulcrum and rotating second hanging portion 31b inward about second rotation shaft 42 as a fulcrum, thereby folding pair of hanging portions 31a, 31b inward. The pair of gripping devices 30 are used in the unfolded state.

[0025] The portal frame 20 includes a first fixing structure for fixing the first hanging portion 31a so that the first hanging portion 31a does not rotate in each of the unfolded state and the folded state, and a second fixing structure for fixing the second hanging portion 31b so that the second hanging portion 31b does not rotate in each of the unfolded state and the folded state.

[0026] The first fixed structure includes a first movable-side through-hole 44 in a movable-side protruding piece 43 fixed to first hanging portion 31a, a 1-1 fixed-side through-hole 46 in a fixed-side protruding piece 45 fixed to one end of upper connecting portion 32, a 1-2 fixed-side through-hole 47 on one end of upper connecting portion 32, and a first pin member 48. In the unfolded state, first pin member 48 is inserted through first movable-side through-hole 44 and 1-1 fixed-side through-hole 46, which overlap each other. In the folded state, first pin member 48 is inserted through first movable-side through-hole 44 and 1-2 fixed-side through-hole 47, which overlap each other.

[0027] The second fixed structure includes second movable-side through-hole 54 at the top of second hanging portion 31b, 2-1 fixed-side through-hole 56 at the other end side of upper connecting portion 32, 2-2 fixed-side through-hole 57 in plate-like portion 55 formed integrally with second support portion 34 and protruding laterally outward, and second pin member 58. In the unfolded state, second pin member 58 is inserted through second movable-side through-hole 54 and 2-1 fixed-side through-hole 56, which overlap each other. In the folded state, second pin member 58 is inserted through second movable-side through-hole 54 and 2-2 fixed-side through-hole 57, which overlap each other.

[0028] If the height of each of hanging portions 31a, 31b is small, or if upper connecting portion 32 is long, second rotating shaft 42 may be provided at the same height as first rotating shaft 41.

[0029] 3(A) and 3(B), grasping device 30 includes a pair of first hooks 61 and second hooks 62 as a structure for grasping object to be grasped 80 from above, a hook support shaft 63 that rotatably supports the pair of first hooks 61 and second hooks 62, a hydraulic cylinder 64 for driving the pair of first hooks 61 and second hooks 62, and a transmission mechanism 65 that transmits the power of hydraulic cylinder 64 to the pair of first hooks 61 and second hooks 62. Note that while FIGS. 3(A) and 3(B) show first hanging part 31a, second hanging part 31b has approximately the same configuration except for the position of rotation shaft 42.

[0030] As shown in Fig. 3(A), the first hook 61 includes two plate-like bodies 71 spaced apart from each other in the axial direction of the hook support shaft 63, and a connecting plate 70 connecting the lower ends of the two plate-like bodies 71. The second hook 62 is composed of one plate-like body 72 disposed between the two plate-like bodies 71 of the first hook 61. In Fig. 3(A), each of the plate-like bodies 71, 72 is hatched to make it easy to identify which members are the plate-like bodies 71, 72.

[0031] The plate-like body 71 of the first hook 61 and the plate-like body 72 of the second hook 62 are formed symmetrically when viewed in the axial direction of the hook support shaft 63 (see FIG. 3(B)). Each plate-like body 71, 72 has a bent portion 71a, 72a supported by the hook support shaft 63, arm portions 71b, 72b extending downward from the bent portions 71a, 72a, and base portions 71c, 72c extending upward from the bent portions 71a, 72a. The arm portions 71b, 72b are curved in an arc shape that bulges outward. The base portions 71c, 72c extend in a direction substantially perpendicular to the extension direction of the upper ends of the arm portions 71b, 72b.

[0032] Hanging portions 31a, 31b are box-shaped bodies that extend vertically. The lower portions of hanging portions 31a, 31b are branched into two in side view to form insertion portion 75 through which object to be grasped 80 is inserted, and each of the branched branch portions 76 extends below the lower ends of pair of first hook 61 and second hook 62. Specifically, hanging portions 31a, 31b include base portion 35 that extends downward from the upper ends of hanging portions 31a, 31b, and hook cover 36 that is provided contiguous to the underside of base 35 and covers pair of first hook 61 and second hook 62.

[0033] The base 35 is formed in the shape of a column with a rectangular cross section. A hydraulic cylinder 64 is housed in the base 35. The hydraulic cylinder 64 is provided with the rod side facing downward. A slide member 67 is fixed to the tip of the rod and is sandwiched between a pair of rail members 66 provided inside the base 35.

[0034] The slide member 67 is formed in a disk shape. When the rod of the hydraulic cylinder 64 moves back and forth, the outer circumferential surface of the slide member 67 slides between the pair of rail members 66. A flange (not shown) is provided on the outer circumferential surface of the slide member 67 to restrict its own movement in the direction of the paper in Figure 3(B).

[0035] The transmission mechanism 65 includes a pair of first and second links 65a and 65b, each of whose upper ends are rotatably connected to a slide member 67. The lower end of the first link 65a is rotatably connected to the upper end of the base 71c of the first hook 61. The lower end of the second link 65b is rotatably connected to the upper end of the base 72c of the second hook 62.

[0036] A hook support shaft 63 is attached to hook cover 36 near the center in the vertical direction. A movable space 68 for a pair of hooks 61, 62 is formed in hook cover 36. Movable space 68 is formed by a hole that penetrates hanging portions 31a, 31b from front to rear.

[0037] With the above configuration, in the gripping device 30, when the pair of arm portions 71b, 72b are in the open state (the state shown in FIG. 3(C)) and the rod of the hydraulic cylinder 64 advances, the slide member 67 moves downward as the rod advances, as shown in FIGS. 3(C)-(E). Then, as the rod advances, the pair of base portions 71c, 72c gradually open, while the pair of arm portions 71b, 72b gradually close. This allows the pair of arm portions 71b, 72b (the pair of hooks 61, 62) to grip the object to be gripped 80.

[0038] Furthermore, when the pair of arm portions 71b, 72b are in the closed state (the state shown in FIG. 3(E)), and the rod of the hydraulic cylinder 64 is retracted, the slide member 67 moves upward as the rod retracts, and as the rod moves, the pair of base portions 71c, 72c gradually close, while the pair of arm portions 71b, 72b gradually open. This allows the object 80 grasped by the pair of arm portions 71b, 72b to be released.

[0039] [About the rotating device] The rotation device 10 is a device that rotates the rotation unit 8 (main body) relative to the unit unit 7 (connection unit 23). In this embodiment, the unit unit 7 is the unit that is fixed to the inner wheel 22a of the attachment 2, and includes the arm connection unit 23. The rotation unit 8 is the unit that is fixed to the outer wheel 22b of the attachment 2, and includes the portal frame 20. The rotation device 10 is configured so that the rotation unit 8 can be rotated by 180 degrees or more relative to the unit unit 7 around the rotation axis of the swivel rotation mechanism 22 (hereinafter referred to as the "swivel axis").

[0040] As shown in Figure 4(A), the rotating device 10 includes a hydraulic cylinder 11 and a power transmission unit 12 that transmits the power generated by the advancement and retreat of the rod 11b of the hydraulic cylinder 11 as a rotational force that rotates the rotating unit 8 to the unit unit 7.

[0041] The hydraulic cylinder 11 includes a cylinder tube 11a rotatably attached to the rotating part 8, a rod 11b attached so as to be able to advance and retreat relative to the cylinder tube 11a, and a piston fixed to the rod 11b within the cylinder tube 11a. The base of the cylinder tube 11a (the side opposite to the tip of the rod 11b) is rotatably attached by a pin member P to the tip of a first support member 13 that is fixed to the outer ring 22b and protrudes outward. The first support member 13 is formed in a tapered shape in a plan view. Note that the pin member P is hatched in FIG. 4(B).

[0042] The power transmission unit 12 includes a crank (bell crank) 14 that is curved outward (curved in a substantially arc shape in FIG. 4A) so as to move away from the pivot shaft when viewed in the axial direction of the pivot shaft (see FIG. 4A), and a link (connecting link) 15 that is rotatably connected to the crank 14. The link 15 extends away from the folded-back portion 14b relative to the point where it is connected to the crank 14. As shown in FIG. 4B, the crank 14 and the link 15 are each formed in a plate shape. The length from one end to the other end of the crank 14 is longer than that of the link 15.

[0043] When viewed in the axial direction of the pivot shaft, the crank 14 has a folded portion 14b extending from one end 14a to the other end 14c. One end 14a of the crank 14 is rotatably attached to the rotating unit 8 (the base portion of the first support member 13) by a pin member P fixed to the unit unit 7. The tip of the rod 11b of the hydraulic cylinder 11 is rotatably attached by the pin member P to a position near one end of the crank 14 (for example, when the distance from the center of the pin P at one end 14a to the center of the pin P at the other end 14c is L1 on the center line of the crank 14 in a top view, a position at a distance of L1 / 3 or less (preferably a position at a distance of L1 / 4 or less) from the center of the pin P at one end 14a on the center line). For example, the crank 14 can be configured such that two plates, each curved in a substantially arc shape when viewed in the axial direction of the pivot shaft, are spaced apart in the axial direction of the pivot shaft, and a flange 14d (see FIG. 4(A)) is sandwiched between the two plates. The flange 14d is not shown in any of the drawings other than FIG. 4(A).

[0044] When viewed in the axial direction of the pivot shaft, the link 15 is a bent member that bulges slightly outward. One end 15a of the link 15 is rotatably attached to the other end 14c of the crank 14 by a pin member P. The link 15 extends from the connection point with the other end 14c on the same side of the crank 14 as the side extending from the folded portion 14b toward the other end 14c. The other end 15b of the link 15 is rotatably attached to the unit unit 7 by a pin member P fixed to the unit unit 7 (the bottom surface of the arm connecting portion 23). In this embodiment, when the distance of a straight line connecting the center of the pin P at one end 15a of the link 15 to the center of the pin P at the other end 15b of the link 15 in a top view is L2, L2 is longer than the distance of a straight line connecting the center of the pin P at one end 14a of the crank 14 in a top view to the center of the pin P at the connecting point of the rod 11b.

[0045] The operation of the rotation device 10 will now be described. In this embodiment, the rotation device 10 rotates the rotation section 8 (such as the portal frame 20 and the first support member 13) relative to the unit section 7 (such as the arm connector 23). However, to make it easier to understand the movement of the crank 14 and the link 15, Figures 5(A)-(C) are drawn so that the arm connector 23 rotates relative to the first support member 13.

[0046] In the rotation device 10, as the rod 11b advances or retreats, a force is applied that rotates the crank 14 and the link 15 relative to the first support member 13 around the pin P of one end 14a of the crank 14. As a result, in FIGS. 5(A)-(C), the other end 15b of the link 15 rotates relative to the first support member 13, and as a result of this rotation, the arm connector 23 rotates relative to the first support member 13. FIG. 5(B) shows a state in which the arm connector 23 has rotated approximately 80 degrees counterclockwise from FIG. 5(A), and FIG. 5(C) shows a state in which the arm connector 23 has rotated approximately 189 degrees counterclockwise from FIG. 5(A). In FIGS. 5(A)-(C), the arm connector 23 rotates counterclockwise when the rod 11b advances, and rotates clockwise when the rod 11b retreats.

[0047] In this way, in the rotating device 10, a force is applied to rotate the crank 14 and the link 15 about one end 14a of the crank 14 as the rod 11b advances or retreats, thereby causing the rotating part 8 to rotate relative to the unit part 7. In this embodiment, the power transmission part 12 is designed so that the rotating part 8 can rotate 180 degrees or more relative to the unit part 7 as the rod 11b advances or retreats.

[0048] [About the tilting device] 2(A), the tilting device 25 is composed of a hydraulic cylinder 25 having a cylinder tube 25a rotatably attached to a member fixed to the first fixed member 21a of the tilting rotation mechanism 21, and a rod 25b attached so as to be movable forward and backward relative to the cylinder tube 25a. The base of the cylinder tube 25a (the side opposite to the tip end of the rod 25b) is rotatably attached to the tip end of the second support member 16, which is fixed to the outer ring 22b and protrudes outward.

[0049] The tip of the rod 25b is attached by a pin member to a member (the upper connection part 32 of the portal frame 20) fixed to the second fixed member 21b of the tilting rotation mechanism 21. The tip of the rod 25b is attached near the center of the upper connection part 32. As shown in FIG. 6(A), the attachment position X of the rod 25b at the upper connection part 32 is laterally shifted from the attachment position Y of the base of the cylinder tube 25a at the second support member 16. The hydraulic cylinder 25 is attached with the tip of the rod 25b facing diagonally downward.

[0050] The operation of the tilting device 25 will now be described. In the rotation device 10, as shown in FIG. 6(A), the distance between the attachment point X and the attachment point Y shortens as the rod 25b retracts, causing the portal frame 20 to rotate around the pin member 21c of the tilting rotation mechanism 21, and the hydraulic cylinder 25 side of the portal frame 20 is lifted. On the other hand, as shown in FIG. 6(B), the distance between the attachment point X and the attachment point Y lengthens as the rod 25b advances, causing the portal frame 20 to rotate around the pin member 21c, and the hydraulic cylinder 25 side of the portal frame 20 is pushed down. This makes it possible to tilt the object 80 to be grasped by the pair of grasping devices 30 at an angle.

[0051] [Effects of the embodiment] In this embodiment, when power is transmitted from rod 11b to a position near one end of crank 14 in power transmission unit 12 as rod 11b advances or retreats, a rotational force centered on one end 14a of crank 14 is transmitted from the other end 15b of link 15. In crank 14 and link 15, the distance from the attachment point of rod 11b to the point where the rotational force is transmitted is longer than the distance from the center of rotation to the attachment point of rod 11b, and there is a turn-back portion 14b between them. Therefore, a single hydraulic cylinder 11 can rotate rotating unit 8 by a large angle relative to unit unit 7. According to this embodiment, a rotation device 10 that is simple in configuration but is capable of rotating a large angle can be realized.

[0052] Conventionally, rotating devices that can rotate 360 ​​degrees are often used. However, such rotating devices use worm gears, swivel gears, etc., and require rotary joints and slip rings to transmit hydraulic pressure and electricity from the arm 6 of the construction machine 1 to the attachment 2, making the structure complicated. In contrast, this embodiment does not use worm gears, etc., and does not require rotary joints or slip rings, making it possible to simplify the attachment 2.

[0053] In this embodiment, the rotation speed can be adjusted by adjusting the amount of oil in one hydraulic cylinder 11, and there are no meshing restrictions as in the case of using a pinion and gear.

[0054] [First Modification of the Embodiment] In this modification, a rotation device 10 is provided on an attachment of a different type from the attachment 2 of the above-described embodiment. The rotation device 10 is provided on an attachment 102 shown in Figures 7(A) and 7(B). In Figure 7(B), the arm connector 23 is shown by a dashed line to make it easier to understand the shape of the rotation device 10.

[0055] The attachment 102 is used to hold steel plates. The attachment 102 includes a base 111, an attraction device 112 provided below the base 111 and magnetically attracting steel plates, an arm connector 23 to which the arm 6 of the construction machine 1 is connected, a fall prevention mechanism 116 for preventing the steel plate attracted by the attraction device 112 from falling, a swivel rotation mechanism 22 for connecting the arm connector 23 and the base 111 so as to be rotatable about a vertical axis of rotation, and a rotation device 10 for rotating the base 111 relative to the arm connector 23. The fall prevention mechanism 116 includes a pair of locking arms 121 whose distal ends can be locked to the steel plate and whose proximal ends are rotatably supported. The attachment 102 and tilting device 25 shown in FIGS. 7(A) and 7(B) may be provided or omitted.

[0056] In this modified example, the unit part 7 is a unit having an arm connecting part 23, and the rotating part 8 is the main body part of the attachment 2 (the part that performs the main function of the attachment 2) having a base 111, an adsorption device 112, and a fall prevention mechanism 116.

[0057] [Second Modification of the Embodiment] In this modified example, a rotation device 10 is provided in an attachment 202 of a type different from the attachment 2 of the above-described embodiment. The rotation device 10 is provided in the attachment 202 shown in Fig. 8. In this modified example, the unit part 7 is a main body part 201 of the attachment 202 (a part that performs the main function of the attachment 202), and the rotation part 8 is a rotating member (a movable arm 223 described later) that is rotatably provided on the main body part 201.

[0058] The attachment 202 is a felling device that cuts down weeds, bamboo, brushwood, etc. using a number of cutters 211 lined up on the outer circumferential surface of a rotating drum 210. The attachment 202 can also be used for cutting stumps, mowing grass, etc. As shown in FIGS. 9(A) and 9(B), the attachment 202 includes an arm connector 23 to which the arm 6 of the construction machine 1 is connected, a housing 205 provided below the arm connector 23, a rotating drum 210 rotatably supported by the housing 205, and a number of cutters 211 provided on the outer circumferential surface of the rotating drum 210. FIG. 9(A) is a front view (front elevation) of the attachment 202. FIG. 9(B) is a side view of the attachment 202 of FIG. 9(A) as viewed in the direction of arrow X.

[0059] Housing 205 is formed in a cylindrical shape with an open bottom. A pair of bottoms 205a of housing 205 support both ends of a cylindrical rotating drum 210. Ring-shaped cutters 211 that protrude from the outer circumferential surface of rotating drum 210 are coaxially attached to rotating drum 210. On rotating drum 210, a large number of cutters 211 are continuously lined up in the axial direction of rotating drum 210. Housing 205 is provided with covers 205b that cover the large number of cutters 211 from the sides so that the lower portions of the large number of cutters 211 are exposed.

[0060] The attachment 202 further includes a motor (e.g., a hydraulic motor or an electric motor) that rotates the rotating drum 210. The motor (not shown) is housed in, for example, a case 221 that protrudes from the bottom 205a at one end of the housing 205. By driving the motor, the multiple cutters 211 rotate together with the rotating drum 210. The arm connector 23 is provided across the housing 205 and the case 221.

[0061] A gripping device 220 is provided on one axial end side of the rotating drum 210 in the attachment 202. As shown in Figures 9(A) and 9(B), the gripping device 220 includes a gripping protrusion 222 that protrudes from the lower end of the case 221 toward the one end side, a movable arm 223 that grips the object to be gripped 200 together with the gripping protrusion 222, and a rotation device 10 that rotates the movable arm 223.

[0062] The gripping device 220 is provided with a plurality of gripping protrusions 222. Each gripping protrusion 222 is formed of a claw-like tooth and protrudes slightly diagonally upward from the horizontal. The gripping device 220 is provided with a plurality of movable arms 223. Each movable arm 223 is a long, slender member that is curved in an arc when viewed from the side. For example, the base of each movable arm 223 is fixed to a shaft 224. When closed, each movable arm 223 is inserted between adjacent gripping protrusions 222. The shaft 224 is rotatably supported by the main body 201 of the attachment 202. The main body 201 includes an arm connecting portion 23, a housing 205, a case 221, etc.

[0063] The rotation device 10 includes a hydraulic cylinder 11 provided in the main body 201 of the attachment 202, and a power transmission unit 12 that transmits power generated by the advancement and retreat of the rod 11b of the hydraulic cylinder 11 as a rotational force to the movable arm 223. Note that Fig. 9(B) shows the power transmission unit 12 in outline.

[0064] The hydraulic cylinder 11 is housed in a case 221 with the tip of the rod 11b facing obliquely upward. In the hydraulic cylinder 11, the base of the cylinder tube 11a is rotatably attached to a support member (not shown) inside the case 221 by a pin member P.

[0065] As shown in Figures 10(A) and 10(B), the power transmission unit 12 includes a crank (bell crank) 14 that is curved outward so as to move away from the shaft 224 when viewed in the axial direction of the shaft 224, and a link (connecting link) 15 that is rotatably connected to the crank 14. The link 15 extends from the point of connection with the crank 14 on the same side of the crank 14 as the side from the folded-back portion 14b toward the other end 14c. The link 15 extends in the direction in which the other end 14c of the crank 14 extends. As shown in Figure 10(B), the crank 14 and the link 15 are each formed in a plate shape. The crank 14 has a longer length from one end to the other end of the link 15.

[0066] When viewed in the axial direction of the shaft 224, the crank 14 has a folded portion 14b extending from one end 14a to the other end 14c. One end 14a of the crank 14 is rotatably attached to the main body 201 by a pin member P fixed to the main body 201. This pin member P is omitted in Figure 10(B).

[0067] The tip of the rod 11b of the hydraulic cylinder 11 is rotatably attached to a position near one end of the crank 14 by a pin member P. In this modification, the tip of the rod 11b of the hydraulic cylinder 11 is rotatably attached to the turn-back portion 14b. In the crank 14, the length from the turn-back portion 14b to the other end is longer than the length from the turn-back portion 14b to one end. In addition, the length from the turn-back portion 14b to the other end is longer than the length of the link 15.

[0068] The link 15 is a member that is bent so as to bulge slightly outward when viewed in the axial direction of the shaft 224. One end 15a of the link 15 is rotatably attached to the other end 14c of the crank 14 by a pin member P. The other end 15b of the link 15 is rotatably attached to one end 225a of a fixed link 225. The fixed link 225 is a member that is integrated with the movable arm 223. The other end 225b of the fixed link 225 is fixed to, for example, the shaft 224. The angle between the fixed link 225 and the movable arm 223, where they intersect at the shaft 224, is constant.

[0069] The operation of the rotation device 10 will be described. In the rotation device 10, as the rod 11b advances or retreats, a force is applied that rotates the crank 14 and the link 15 relative to the main body 201 around the pin P at one end 14a of the crank 14. As a result, in FIGS. 11(A)-(D), the other end 15b of the link 15 rotates, and as a result of this rotation, the fixed link 225 and the movable arm 223 rotate around the shaft 224 supported by the main body 201. FIG. 11(B) shows a state in which the crank 14 has rotated approximately 30 degrees counterclockwise from FIG. 11(A). FIG. 11(C) shows a state in which the crank 14 has rotated approximately 60 degrees counterclockwise from FIG. 11(A). FIG. 11(D) shows a state in which the crank 14 has rotated approximately 90 degrees counterclockwise from FIG. 11(A). The movable arm 223 rotates approximately 165 degrees (an angle greater than the rotation angle of the crank 14) from Figure 11(A) to Figure 11(D). In Figures 11(A) to 11(D), the crank 14 rotates clockwise when the rod 11b advances, and rotates counterclockwise when the rod 11b retreats.

[0070] In this modification, the power transmission unit 12 is designed so that the movable arm 223 can be rotated 100 degrees or more relative to the main body 201 as the rod 11b retracts from the closed state (the state of FIG. 11(A)). Therefore, the movable arm 223 is less likely to get in the way when the gripping device 220 is not in use. Furthermore, because the movable arm 223 can be rotated a large amount relative to the main body 201, the angular range over which gripping force can be applied to the movable arm 223 is increased. The thrust of the cylinder 14 can be effectively utilized.

[0071] 12(A) and 12(B), the rotation device 10 may be configured so that the rod 11b of the hydraulic cylinder 11 moves back and forth laterally. The rotation device 10 may also be configured so that the movable arm 223 opens as the rod 11b moves forward.

[0072] [Third Modification of the Embodiment] In this modification, the rotation device 10 is provided on an attachment 302 of a type different from the attachment 202 of the second modification described above. The rotation device 10 is provided on the attachment 302 shown in Fig. 13(A) and Fig. 13(B). In this modification, the unit part 7 is the main body part 301 of the attachment 302 (the part that performs the main function of the attachment 302), and the rotation part 8 is a rotating member (a grapple 310 described later) rotatably provided on the main body part 301. In this respect, this modification is the same as the second modification.

[0073] The attachment 302 is a bucket device equipped with a grapple 310 and a cutter 330. As shown in FIGS. 13(A) and 13(B), the attachment 302 includes an arm connector 23 to which the arm 6 of the construction machine 1 is connected, a bucket 303 supported below the arm connector 23 so as to be rotatable about a vertical rotation axis, a grapple device 304 attached to the bucket 303, a cutting device 305 attached to the bucket 303, and a rolling device 306 attached to the bucket 303. FIG. 13(A) is a see-through side view of the interior of the bucket 303 in the attachment 302. FIG. 13(B) is a front view of the attachment 302 in FIG. 13(A) (viewed from the opening side of the bucket 303).

[0074] The bucket 303 includes a pair of side plates 303a, a bottom plate 303b connecting the lower ends of the pair of side plates 303a, and a rear plate 303c connecting the rear ends of the pair of side plates 303a. The outer periphery of the side plate 303a on the opening side (front side) is provided with a jagged uneven portion 303d at the bottom, and a curved portion 303e curved rearward is provided above the uneven portion 303d. The opening side of the bottom plate 303b also has a jagged uneven portion.

[0075] The grapple device 304 includes a grapple 310 rotatably supported on a shaft 308 provided on the bucket 303, and a rotation device 10 that rotates the grapple 310. The shaft 308 is hung between a pair of side plates 303a of the bucket 303 and extends in the horizontal direction. The shaft 308 is rotatably supported on the upper part of the opening side of the bucket 303 (the part on the arm connecting portion 23 side).

[0076] The grapple 310 is a rotating body that assumes a frame shape when the shaft 308 is included. The grapple 310 includes a pair of movable side plates 311 whose tip sides abut against the pair of side plates 303a of the bucket 303, and a tip member 312 that is hung across the tip portions of the pair of movable side plates 311. A tubular reinforcing member 315, for example, is hung across the pair of movable side plates 311. A pair of reinforcing plates 316 that are rotatably supported on the shaft 308 are fixed to the reinforcing member 315.

[0077] The movable side plate 311 is curved so as to bulge outward in a side view. A jagged uneven portion 311a is provided at the tip of the inner portion of the outer periphery of the movable side plate 311, and a curved portion 311b is provided at the base of the uneven portion 311a. The curved portion 311b is curved outward in an arc shape.

[0078] The tip member 312 is formed in a plate shape. A plurality of teeth (claw-shaped portions) 313 that protrude outward are provided on the tip member 312. In addition, an uneven portion that meshes with an uneven portion (an uneven portion extending in the width direction) of the bottom plate 303b of the bucket 303 is formed on the inner portion of the outer periphery of the tip member 312.

[0079] The rotation device 10 includes a hydraulic cylinder 11 provided inside the bucket 303, and a power transmission unit 12 that transmits power generated by the advancement and retreat of a rod 11b of the hydraulic cylinder 11 as a rotational force to the grapple 310. Note that Fig. 13(B) shows the power transmission unit 12 in outline.

[0080] The hydraulic cylinder 11 is disposed inside the bucket 303 with the rod 11b oriented so as to advance and retreat laterally. The base of the cylinder tube 11a is rotatably attached to the rear of the bucket 303 by a pin member P.

[0081] As shown in Fig. 14, the power transmission unit 12 includes a crank (bell crank) 14 that is curved outward so as to move away from the shaft 308 when viewed in the axial direction of the shaft 308, and a link (connecting link) 15 that is rotatably connected to the crank 14. The link 15 extends from the point of connection with the crank 14 on the same side as the side of the crank 14 that extends from the folded-back portion 14b toward the other end 14c. The crank 14 and the link 15 are each formed, for example, in a plate shape. The length from one end to the other end of the crank 14 is longer than that of the link 15.

[0082] When viewed in the axial direction of the shaft 308, the crank 14 has a folded portion 14b extending from one end 14a to the other end 14c. One end 14a of the crank 14 is rotatably attached to the bucket 303 by a pin member P fixed to the bucket 303.

[0083] The tip of the rod 11b of the hydraulic cylinder 11 is rotatably attached to a position near one end of the crank 14 by a pin member P. In this modification, the tip of the rod 11b of the hydraulic cylinder 11 is rotatably attached to the turn-back portion 14b. In the crank 14, the length from the turn-back portion 14b to the other end is longer than the length from the turn-back portion 14b to one end. In addition, the length from the turn-back portion 14b to the other end is longer than the length of the link 15.

[0084] The link 15 is a member that extends straight when viewed in the axial direction of the shaft 308. One end 15a of the link 15 is rotatably attached to the other end 14c of the crank 14 by a pin member P. The other end 15b of the link 15 is rotatably attached to one end 225a of a fixed link 225. The fixed link 225 is integrated with the grapple 310 via, for example, a reinforcing member 315. The grapple 310 and the fixed link 225 are rotatably attached to the shaft 308. The angle between the fixed link 225 and the movable side plate 311 of the grapple 310, which intersect at the shaft 308, is constant.

[0085] The operation of the rotation device 10 will be described. In the rotation device 10, as the rod 11b advances or retreats, a force is applied that rotates the crank 14 and the link 15 relative to the main body 301 around the pin P at one end 14a of the crank 14. As a result, in FIGS. 14(A)-(D), the other end 15b of the link 15 rotates, and as a result of this rotation, the fixed link 225 and the grapple 310 rotate around the shaft 308 supported by the main body 301. FIG. 14(B) shows a state in which the crank 14 has rotated approximately 30 degrees counterclockwise from FIG. 14(A). FIG. 14(C) shows a state in which the crank 14 has rotated approximately 60 degrees counterclockwise from FIG. 14(A). FIG. 14(D) shows a state in which the crank 14 has rotated approximately 70 degrees counterclockwise from FIG. 14(A). The grapple 310 rotates approximately 115 degrees (an angle greater than the rotation angle of the crank 14) from Figure 14(A) to Figure 14(D). In Figures 14(A) to 14(D), the crank 14 rotates counterclockwise when the rod 11b advances, and rotates clockwise when the rod 11b retracts.

[0086] In this modification, the power transmission unit 12 is designed so that the grapple 310 can be rotated 100 degrees or more relative to the bucket 303 as the rod 11b retracts from the state in which the grapple 310 is closed (the state shown in FIG. 14(A)). Therefore, the grapple 310 is less likely to get in the way when the gripping device 220 is not in use. Furthermore, with the grapple 310 in the closed state shown in FIG. 14(D), the bucket 303 and the grapple 310 are integrated, and the teeth 313 of the grapple 310 can be used for the bucket 303.

[0087] The cutting device 305 includes a cutter 330 rotatably mounted on a shaft 308, and a cutter rotation device 331 that rotates the cutter 330. In this modification, the cutter 330 is rotatably supported on the same shaft 308 as the grapple 310, but it may also be supported on a shaft provided separately from the shaft 308.

[0088] The cutter 330 protrudes radially outward from the shaft 308. A blade 330a is formed on the inner side of the outer periphery of the cutter 330. The blade 330a is curved so as to warp toward the ridge side of the cutter 330.

[0089] The cutter rotation device 331 includes a second hydraulic cylinder 333 provided inside the bucket 303, and a link 334 that transmits power generated by the advancement and retreat of the rod of the second hydraulic cylinder 333 as a rotational force to the cutter 330. The link 334 is integrated with the cutter 330. The cutter 330 and the link 334 are rotatably attached to the shaft 308.

[0090] In the cutter rotation device 331, as the rod of the second hydraulic cylinder 333 advances or retreats, a force is applied to rotate the cutter 330 and the link 334 around the shaft 308. In this modification, as the rod of the second hydraulic cylinder 333 advances, the cutter 330 rotates in the cutting direction, and as the rod of the second hydraulic cylinder 333 retreats, the cutter 330 rotates in the anti-cutting direction.

[0091] The attachment 302 of this modification can grasp a long object to be grasped (such as wood) 300 between the movable side plate 311 of the grapple 310 and the side plate 303a of the bucket 303, as shown in FIG. 15(A), by rotating the grapple 310 toward the closing side using the rotation device 10. Then, with the object to be grasped 300 grasped, the cutter 330 can be rotated in the cutting direction using the cutter rotation device 331, as shown in FIG. 15(B), thereby cutting the object to be grasped 300. Furthermore, the attachment 302 can grasp a relatively thin object to be grasped 300 between the uneven portion 311a of the movable side plate 311 of the grapple 310 and the uneven portion 303d of the side plate 303a of the bucket 303, as shown in FIG. 15(C). Furthermore, the ground can be compacted by the compacting device 306 with the attachment 302 tilted so that the bottom plate 303b of the bucket 303 is approximately in balance with the ground (the state shown in FIG. 15(D)).

[0092] [Other embodiments] In the above-described embodiment, the cylinder tube 11a of the hydraulic cylinder 11 of the rotation device 10 may be rotatably attached to the arm connecting portion 23 side, and the other end 15b of the link 15 may be rotatably attached to the portal frame 20 side. That is, in the above-described embodiment, the base of the cylinder tube 11a is attached to the rotating portion, but the base of the cylinder tube 11a may also be attached to the unit portion.

[0093] In the above-described embodiment, a tilting rotation mechanism 21 may be provided between the arm connecting portion 23 and the swiveling rotation mechanism 22 .

[0094] In the above-described embodiment, the folded portion 14b may be bent in an L-shape, a V-shape, or the like, instead of an arc shape. [Industrial Applicability]

[0095] The present invention is applicable to a rotating device or the like provided on an attachment of a construction machine or the like. [Explanation of symbols]

[0096] 1. Construction machinery 2 Attachments 7 Unit 1 8 Unit 2 10 Rotating device 11 Hydraulic cylinder 12 Power transmission section 13 First support member 14 Crank 15 Links 16 Second support member 19 Connecting member 20 Gate-type frame 21 Tilting rotation mechanism 22 Swivel rotation mechanism 23 Arm connection part 25 Tilting device, hydraulic cylinder 30 Gripping device 31 Drooping part 32 Upper connection 33 1st support part 34 Second support part 35 Base 36 Hook cover 61 First Hook 62 Second Hook 63 Hook support shaft 64 Hydraulic Cylinder 65 Transmission Mechanism 66 Rail member 67 Slide member 71 Plate-shaped body 72 Plate-shaped body 75 Insertion part 76 Branch 80 Grasped object 102 Attachment 111 Foundation 112 Adsorption device 116 Fall prevention mechanism 121 Locking arm 201 Main body 202 Attachment 205 Housing 210 Rotating Drum 211 Cutter 220 Gripping device 221 cases 222 Gripping protrusion (tooth) 223 Movable Arm 224 Shaft 301 Main body 302 Attachment 303 Bucket 304 Grapple Device 305 Cutting device 306 Rolling equipment 308 Shaft 310 Grapple 311 Movable side plate 312 Tip Parts 315 Reinforcement members 330 Cutter 331 Cutter Rotating Device

Claims

1. A rotation device used in an attachment to which an arm of a construction machine is connected, The attachment includes a unit portion and a rotating portion rotatably provided on the unit portion, The rotating device comprises: A hydraulic cylinder, a power transmission unit that transmits power generated by the advancement and retreat of the rod of the hydraulic cylinder to the unit unit as a rotational force that rotates the rotating unit, The power transmission unit is a crank having a folded portion extending from one end to the other end, one end of which is rotatably attached to one of the unit portion and the rotating portion; a link whose one end is rotatably connected to the other end of the crank and whose one end extends from the connection point to the same side of the crank as the side from the folded-back portion to the other end, the other end of the link is rotatably attached to the other of the unit portion and the rotating portion, The rod of the hydraulic cylinder is rotatably attached to a position near one end of the crank, A rotating device in which a force is applied to rotate the crank and the link around one end side of the crank as the rod advances or retreats, thereby rotating the rotating part relative to the unit part.

2. The rotation device according to claim 1 , wherein the power transmission section is configured to be able to rotate the rotation section by 180 degrees or more relative to the unit section as the rod advances or retreats.

3. the unit portion is a unit having an arm connecting portion to which the arm is connected, the rotating part is a main body part of the attachment, The rotation device according to claim 1 or 2, wherein the main body portion rotates relative to the connecting portion as the rod advances or retreats.

4. the unit portion is a main body portion of the attachment, the rotating portion is a rotating member rotatably provided with respect to the main body portion, The rotating device according to claim 1 or 2, wherein the rotating member is rotated relative to the main body in accordance with the advancement or retraction of the rod.

Images