Excavator mounted vestibule saw

Abstract

A pruning saw for mounting on an excavator is disclosed for safely and efficiently cutting tree branches encroaching on a road. The pruning saw for mounting on an excavator comprises: a support body; a cutting unit attached to the support body and including a plurality of circular blades; a blade driving unit attached to the support body and driving the circular blades; a main body; a clamp link attached to the main body to quickly and safely mount or detach from the excavator arm; a first axis rotation cylinder, one end of which is rotatably attached to the main body to adjust the circular blades left and right; a joint assembly rotatably connected to the other end of the first axis rotation cylinder; a cylinder bracket rotatably connected to the joint assembly; and a second axis rotation cylinder, one end of which is attached to the joint assembly and the other end of which is rotatably attached to the cylinder bracket to adjust the circular blades up and down. Accordingly, the tree can be mounted on an excavator to safely cut branches at a height, and since it is equipped with a first axis rotation cylinder and a second axis rotation cylinder to enable multi-axis rotation, tree branches at various angles can be efficiently cut.

Description

Technology Field

[0001] The present invention relates to a pruning saw for mounting on an excavator, and more specifically, to a pruning saw for mounting on an excavator to enable multi-axis rotation, for safely and efficiently cutting tree branches at high altitudes. Background Technology

[0002] Generally, roadside trees serve the functions of enhancing aesthetics, providing shade, and absorbing dust so that it is washed away by rainwater into the sewers; however, if they are not pruned regularly, they cause significant inconvenience to vehicles traveling on the road. In particular, overgrown trees, shrubs, and weeds are becoming more severe on roads in remote mountainous areas, obstructing the path of vehicles.

[0003] Therefore, roadside trees are regularly pruned to prevent obstruction to vehicle traffic. However, cutting thick branches located at high altitudes requires workers to perform the work directly, which poses a high risk of safety accidents and reduces work efficiency. In particular, existing pruning devices have limitations in that the adjustment of the cutting angle is restricted, making it difficult to precisely cut branches extending in various directions. Prior art literature

[0004] Korean Registered Patent No. 10-2788178 (Published Mar. 31, 2025) (Tree branch cutting device for a cargo crane for pruning tree branches of trees around extra-high voltage distribution lines and street trees around roads) Korean Published Patent No. 10-2019-0055905 (Published May 24, 2019) (Vehicle for pruning street trees and method for handling pruned branches) Korean Registered Patent No. 10-2552414 (Published July 6, 2023) (Pruning device for a street tree pruning vehicle) The problem to be solved

[0006] Accordingly, the technical problem of the present invention is based on this point, and the objective of the present invention is to provide a pruning saw for mounting on an excavator that can safely cut branches at high altitudes and can efficiently cut street tree branches at various angles by being equipped with a first axis rotation cylinder and a second axis rotation cylinder to enable multi-axis rotation. means of solving the problem

[0007] To realize the above-described objective of the present invention, a pruning saw for mounting on an excavator according to one embodiment comprises: a support body; a cutting part including a plurality of circular blades and coupled to the support body; a blade driving part coupled to the support body and driving the circular blades; a main body; a clamp link coupled to the main body to quickly and safely mount or detach from the excavator arm; a first axis rotation cylinder, one end of which is rotatably coupled to the main body to adjust the circular blades left and right; a joint assembly rotatably connected to the other end of the first axis rotation cylinder; a cylinder bracket rotatably connected to the joint assembly; and a second axis rotation cylinder, one end of which is coupled to the joint assembly and the other end of which is rotatably coupled to the cylinder bracket to adjust the circular blades up and down.

[0008] In one embodiment of the present invention, the blade drive unit may include: a motor connected to the support body; a drive pulley connected to the central axis of the motor and transmitting rotational force according to the rotation of the motor; a belt unit including a plurality of belts and transmitting rotational power generated from the motor to the cutting unit; a driven pulley unit including a plurality of driven pulleys and rotating according to the rotation of the drive pulley; a belt tensioner unit including a plurality of belt tensioners; and a tension pulley unit including a plurality of tension pulleys and adjusting the tension of the belt unit.

[0009] In one embodiment of the present invention, the joint assembly may be rotatably connected to the second axis rotation cylinder and the first axis rotation cylinder when observed in the XY plane.

[0010] In one embodiment of the present invention, the joint assembly can be rotatably connected to the second axis rotation cylinder and the first axis rotation cylinder when observed in the YZ plane.

[0011] In one embodiment of the present invention, the joint assembly can be rotatably connected to the second axis rotation cylinder and the first axis rotation cylinder when observed in the XZ plane.

[0012] In one embodiment of the present invention, the joint assembly can be rotatably connected to the second axis rotation cylinder and the cylinder bracket when observed in the XY plane.

[0013] In one embodiment of the present invention, the joint assembly comprises a joint member, wherein the joint member may include: a first central piece having a square shape and having a first central hole formed in the center; a first extension piece having a first extension hole formed in the center and bent vertically from a first side of the first central piece; a second extension piece having a second extension hole formed in the center and bent vertically from a second side of the first central piece to extend parallel to the first extension piece; a second central piece bent vertically from a third side of the first central piece; and a third extension piece having a third extension hole formed in the center and bent vertically from a first side of the second central piece.

[0014] In one embodiment of the present invention, the pruning saw for mounting on an excavator described above may further include a fixing link unit that is fastened to protrude toward the cutting target from the support body and fixes the cutting target to prevent vibration or slippage during cutting, thereby improving the cutting stability of the tree branch.

[0015] In one embodiment of the present invention, the above-described pruning saw for mounting on an excavator may further include a support assembly that prevents shaking of the device and stably supports the pruning saw for mounting on an excavator before and after pruning operations in order to improve work efficiency and safety. Effects of the invention

[0016] This excavator-mounted pruning saw allows for safe branch cutting at heights when mounted on an excavator, and enables multi-axis rotation by being equipped with a first and second axis rotation cylinder, thereby allowing for the efficient cutting of street tree branches at various angles. Accordingly, the fusion of the excavator and the pruning saw simultaneously improves cutting precision, work efficiency, safety, maintainability, and versatility. In particular, the structural features of the multi-axis rotation structure, fixed link, and support assembly enable the rapid and safe cutting of branches at high positions, thereby enhancing practical value in real-world work environments such as large-scale street tree management. Brief explanation of the drawing

[0017] FIG. 1 is a perspective view illustrating a pruning saw for mounting on an excavator according to one embodiment of the present invention. Figure 2 is a drawing illustrating an example in which a pruning saw for excavator mounting shown in Figure 1 is mounted on an excavator arm. Figure 3 is a drawing showing the combined state of the cutting section and the blade driving section shown in Figure 1. FIG. 4 is an exploded side view illustrating the first driven pulley and the first tension pulley shown in FIG. 3. Figure 5 is a drawing for explaining the main body shown in Figure 1. Figure 6 is a drawing for explaining the clamp link illustrated in Figure 1. Figure 7 is a drawing for explaining the cylinder bracket shown in Figure 1. FIG. 8a is a drawing for explaining a support assembly that is fastened to the main body shown in FIG. 1, and FIG. 8b is a drawing for explaining the support assembly. Figure 9 is a diagram illustrating the left and right rotation operation state by the first axis rotation cylinder shown in Figure 1. FIG. 10 is a drawing for explaining the up-and-down rotation operation state by the second axis rotation cylinder shown in FIG. 1. FIG. 11 is a perspective view for explaining the joint member illustrated in FIG. 1. FIGS. 12a to 12d are drawings for explaining the connection of the joint members shown in FIG. 11. FIG. 13 is a side view illustrating an excavator equipped with a pruning saw for mounting on an excavator as shown in FIG. 1. Specific details for implementing the invention

[0018] Hereinafter, the present invention will be described in more detail with reference to the attached drawings. Since the present invention is susceptible to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed forms, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0019] In describing each drawing, similar reference numerals have been used for similar components. In the attached drawings, the dimensions of the structures are depicted enlarged compared to their actual size to ensure clarity of the invention.

[0020] Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0021] In this application, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0022] Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0023] The present invention will be described in detail below with reference to the attached drawings.

[0024] FIG. 1 is a perspective view illustrating a pruning saw for mounting on an excavator according to an embodiment of the present invention. FIG. 2 is a drawing illustrating an example in which the pruning saw for mounting on an excavator shown in FIG. 1 is mounted on an excavator arm. FIG. 3 is a drawing illustrating the combined state of the cutting part and the blade driving part shown in FIG. 1.

[0025] Referring to FIGS. 1, 2 and 3, a pruning saw for mounting on an excavator according to one embodiment of the present invention includes a support body (100), a cutting part (200), a blade driving part (300), a main body (400), a clamp link (500), a first axis rotation cylinder (600), a joint assembly (700), a cylinder bracket (800), and a second axis rotation cylinder (900).

[0026] The support body (100) has a square plate shape of a certain length and a certain width and supports the cutting part (200) and the blade driving part (300).

[0027] The cutting section (200) is fastened to the support body (100). The cutting section (200) includes a first circular blade (210), a second circular blade (220), a third circular blade (230), and a fourth circular blade (240).

[0028] The blade drive unit (300) includes a motor (310), a drive pulley (320), a belt unit (330), a driven pulley unit (340), a belt tensioner unit (350), and a tension pulley unit (360), and is connected to a support body (100) to drive the cutting unit (200).

[0029] The motor (310) is connected to the support body (100) and converts electrical energy into mechanical rotational energy to provide basic driving force that enables the rotation of the first to fourth circular saws (210, 220, 230, 240) of the cutting unit (200).

[0030] The driving pulley (320) is connected to the central axis of the motor (310) and transmits rotational force to the driven pulley unit (340) through the belt unit (330) according to the rotation of the motor (310) to drive the cutting unit (200).

[0031] The belt unit (330) transmits rotational power generated from the motor (310) to the cutting unit (200). The belt unit (330) includes a first belt (332), a second belt (334), and a third belt (336).

[0032] The driven pulley unit (340) rotates according to the rotation of the driving pulley (320). The driven pulley unit (340) includes a first driven pulley (342) whose central axis is connected to the first circular blade (210), a second driven pulley (344) whose central axis is connected to the second circular blade (220), a third driven pulley (346) whose central axis is connected to the third circular blade (230), and a fourth driven pulley (348) whose central axis is connected to the fourth circular blade (240). The first driven pulley (342) is connected to the driving pulley (320) via the first belt (332) and rotates according to the rotation of the driving pulley (320) to rotate the first circular blade (210). The second driven pulley (344) is connected to the driving pulley (320) via the second belt (334) and rotates according to the rotation of the driving pulley (320) to rotate the second circular blade (220). The third driven pulley (346) is connected to the driving pulley (320) via the first belt (332) and rotates according to the rotation of the driving pulley (320) to rotate the third circular blade (230). The fourth driven pulley (348) is connected to the driving pulley (320) via the third belt (336) and rotates according to the rotation of the driving pulley (320) to rotate the fourth circular blade (240).

[0033] In this way, a drive pulley (320) is connected to the rotation axis of the motor (310), and power is transmitted to the belt unit (330) through the drive pulley (320), and the belt unit (330) rotates the driven pulley unit (340) to rotate the first to fourth circular blades (210, 220, 230, 240) simultaneously. A single motor (310) rotates multiple circular blades simultaneously through the belt pulley system, allowing multiple branches to be cut simultaneously, thereby achieving a reduction in working time and an improvement in cutting efficiency.

[0034] The belt tensioner unit (350) adjusts the tension of the belt unit (330) using the tension pulley unit (360). The belt tensioner unit (350) includes a first belt tensioner (352), a second belt tensioner (354), and a third belt tensioner (356), and the tension pulley unit (360) includes a first tension pulley (362), a second tension pulley (364), and a third tension pulley (366). The first belt tensioner (352) adjusts the tension of the first belt (332) through the first tension pulley (362), the second belt tensioner (354) adjusts the tension of the second belt (334) through the second tension pulley (364), and the third belt tensioner (356) adjusts the tension of the third belt (336) through the third tension pulley (366).

[0035] FIG. 4 is an exploded side view to explain the first driven pulley and the first tension pulley shown in FIG. 3. Although FIG. 4 describes the first driven pulley (342) and the first tension pulley (362) as examples, it is obvious that the second driven pulley (344), the second tension pulley (364), the third driven pulley (346), the third tension pulley (366), and the fourth driven pulley (348) shown in FIG. 1, FIG. 2, and FIG. 3 also have the same structure.

[0036] Referring to FIGS. 3 and 4, the first driven pulley (342) includes a V-ribbed pulley (3421), a first bearing (3422), a first spacer (3423), a second bearing (3424), a bearing housing (3425), a second spacer (3426), and a first shaft (3427), and is fastened to the first circular blade (210) through a fastening cover (212). The structure is arranged such that after the second spacer (3426) is fitted onto the first shaft (3427), the first shaft (3427) is inserted into the bearing housing (3425). The structure is arranged such that the second bearing (3424), the first spacer (3423), and the first bearing (3422) are sequentially inserted into the bearing housing (3425), and then the V-ribbed pulley (3421) is fitted therein.

[0037] The first tension pulley (362) includes an idler roller (3621), a third bearing (3622), a third spacer (3623), a fourth bearing (3624), a fourth spacer (3625), and a second shaft (3626). The structure is arranged such that the fourth spacer (3625), the fourth bearing (3624), the third spacer (3623), and the third bearing (3622) are sequentially fitted onto the second shaft (3626), after which the idler roller (3621) is fitted.

[0038] Referring again to FIGS. 1, FIGS. 2 and FIGS. 3, the main body (400) supports the clamp link (500) and the first axis rotation cylinder (600).

[0039] Figure 5 is a drawing for explaining the main body shown in Figure 1.

[0040] Referring to FIGS. 1 and FIGS. 5, a hole formed along the Z-axis direction is formed in the main body (400) to insert a pivot rod (410). The portion into which the pivot rod (410) is inserted is fastened to a joint assembly (700). Additionally, a fastening projection (420) is formed in the main body (400) for fastening a support assembly (1100) (described in FIGS. 8a and FIGS. 8 below).

[0041] Referring again to FIGS. 1, 2 and 3, the clamp link (500) is fastened to the main body (400) so as to be quickly and safely attached to or detached from the excavator arm.

[0042] Figure 6 is a drawing for explaining the clamp link illustrated in Figure 1.

[0043] Referring to FIGS. 1 and 6, the clamp link (500) comprises a first side plate (510), a second side plate (520) spaced apart from the first side plate (510) and arranged parallel thereto, a first fixing rod (530) inserted into a hole formed in the first side plate (510) and a hole formed in the second side plate (520), and a second fixing rod (540) inserted into a hole formed in the first side plate (510) and a hole formed in the second side plate (520). The first fixing rod (530) and the second fixing rod (540) are detachably mounted on an excavator arm.

[0044] Referring again to FIGS. 1, 2, and 3, one side of the first axis rotation cylinder (600) is connected to the main body (400) to adjust the cutting section (200) left and right. In this embodiment, the first axis rotation cylinder (600) includes one side connected to the main body (400) and the other side rotatably connected to the joint assembly (700). The first axis rotation cylinder (600) performs yaw axis (or vertical axis) rotation by pulling or pushing the joint assembly (700).

[0045] The joint assembly (700) is a central connecting structure responsible for transmitting rotational motion and connecting machine parts in a pruning saw mounted on an excavator, and is rotatably connected to the other side of the first axis rotation cylinder (600). The joint assembly (700) serves as a connecting hub for the first axis rotation cylinder (600) which rotates in the left-right direction (based on the X-axis) and the second axis rotation cylinder (900) which rotates in the up-down direction (based on the Z-axis), and connects these two cylinders orthogonally to each other so that two-axis rotational motion can be performed independently.

[0046] The cylinder bracket (800) is an intermediate connecting support structure that connects the second axis rotating cylinder (900) and the joint assembly (700) in a pruning saw mounted on an excavator, and is rotatably connected to the joint assembly (700).

[0047] Figure 7 is a drawing for explaining the cylinder bracket shown in Figure 1.

[0048] Referring to FIGS. 1 and 7, the cylinder bracket (800) comprises a square bar-shaped bracket body (810), a first fastening member (820) disposed in one side area of ​​the bracket body (810) and connected to one end of a second axis rotating cylinder (900), and a second fastening member (830) disposed in the other side area of ​​the bracket body (810) and connected to a joint assembly (700). The first fastening member (820) is connected to the second axis rotating cylinder (900) by a pivot rod (not shown), and the second fastening member (830) is connected to the joint assembly (700) by a plurality of screws or bolts.

[0049] Referring again to FIGS. 1, 2 and 3, one side of the second axis rotation cylinder (900) is rotatably connected to the joint assembly (700) and the other side is connected to the cylinder bracket (800) so as to adjust the cutting part (200) up and down.

[0050] In this embodiment, the first axis rotation cylinder (600) rotates a plurality of cutting parts (200) in the left-right direction, and the second axis rotation cylinder (900) rotates a plurality of cutting parts (200) in the up-down direction.

[0051] A pruning saw for mounting on an excavator according to one embodiment may further include a fixing link unit (1000) that is fastened to protrude toward the cutting target from a support body (100) and fixes the cutting target to improve cutting stability of a tree branch by preventing vibration or slippage during cutting. The fixing link unit (1000) may include a first fixing link (1010), a second fixing link (1020), and a third fixing link (1030), as shown in FIGS. 2 and 3. The first fixing link (1010) may be positioned between a first circular blade (210) and a second circular blade (220), the second fixing link (1020) may be positioned between a first circular blade (210) and a third circular blade (230), and the third fixing link (1030) may be positioned between a third circular blade (230) and a fourth circular blade (240).

[0052] A pruning saw for mounting on an excavator according to one embodiment may further include a support assembly (1100) that prevents shaking of the device and stably supports the pruning saw for mounting on an excavator before and after pruning operations in order to improve work efficiency and safety.

[0053] FIG. 8a is a drawing for explaining a support assembly that is fastened to the main body shown in FIG. 1, and FIG. 8b is a drawing for explaining the support assembly.

[0054] Referring to FIGS. 1, FIGS. 8a, and FIGS. 8b, the support assembly (1100) is fastened to a fastening projection (420) of the main body (400). The support assembly (1100) includes a support rod (1110), a first leg (1120) fastened to a first side of the lower end of the support rod (1110), a second leg (1130) fastened to a second side of the lower end of the support rod (1110), and a third leg (1140) fastened to a third side of the lower end of the support rod (1110). The first leg (1120) is positioned perpendicular to the second leg (1130), and the second leg (1130) and the third leg (1140) are positioned on the same axis.

[0055] Figure 9 is a diagram illustrating the left and right rotation operation state by the first axis rotation cylinder shown in Figure 1.

[0056] Referring to FIGS. 1 and 9, when the first axis rotation cylinder (600) connected to the main body (400) is extended, the joint assembly (700) is pushed in the X-axis direction, and the cylinder bracket (800) is positioned along the X-axis. Accordingly, the cylindrical saws connected to the cylinder bracket (800) are positioned parallel to the X-axis direction to cut thick branches at high positions located in the X-axis direction. In the drawings, a second circular blade (220) connected by a connecting cover (222) is shown.

[0057] Meanwhile, when the first axis rotation cylinder (600) connected to the main body (400) is retracted, the joint assembly (700) is pulled in the -X-axis direction, and the cylinder bracket (800) is positioned along the Y-axis. Accordingly, the cylindrical saws (the second circular blade (220) is shown in the drawing) connected to the cylinder bracket (800) are positioned parallel to the Y-axis direction, thereby cutting thick branches at high positions located in the Y-axis direction.

[0058] FIG. 10 is a drawing for explaining the up-and-down rotation operation state by the second axis rotation cylinder shown in FIG. 1.

[0059] Referring to FIGS. 1 and FIGS. 10, when the second axis rotation cylinder (900) is retracted, the cylinder bracket (800) is positioned along the Z-axis. Accordingly, the cylindrical saws attached to the cylinder bracket (800) are positioned parallel to the Z-axis direction to cut thick branches at high positions positioned in the X-axis direction.

[0060] Meanwhile, with the second axis rotation cylinder (900) extended, the cylinder bracket (800) is positioned along the Y-axis. Accordingly, the cylindrical saws attached to the cylinder bracket (800) are positioned parallel to the Y-axis direction to cut thick branches at high positions located in the X-axis direction.

[0061] FIG. 11 is a perspective view for explaining the joint member illustrated in FIG. 1.

[0062] Referring to FIGS. 1 and FIGS. 11, the joint member (710) is a part designed to properly connect and transmit rotational force generated from a first axis rotation cylinder (600) and a second axis rotation cylinder (900), and includes a first center piece (711), a second center piece (712), a first extension piece (713), a second extension piece (714), and a third extension piece (715).

[0063] The first central piece (711) has a square shape and a first central hole (711a) is formed in the center.

[0064] The second center piece (712) is bent vertically from the first side of the first center piece (711).

[0065] The first extension piece (713) has a first extension hole (713a) formed in the center and is bent vertically at the second side of the first center piece (711).

[0066] The second extension piece (714) has a second extension hole (714a) formed in its center and is bent vertically from the third side of the first center piece (711) to extend parallel to the first extension piece (713). The third side of the first center piece (711) and the second side of the first center piece (711) face each other. The central axis of the second extension hole (714a) and the central axis of the first extension hole (713a) are the same.

[0067] The third extension piece (715) has a third extension hole (715a) formed in its center and is bent vertically from the first side of the second center piece (712). The third extension piece (715) is positioned parallel to the first center piece (711). The center axis of the third extension hole (715a) and the center axis of the first center hole (711a) are the same.

[0068] FIGS. 12a to 12d are drawings for explaining the connection of the joint member shown in FIG. 11. In particular, FIG. 12a is a perspective view for explaining the joint member (710) shown in FIG. 11, FIG. 12b is a front view of a joint assembly (700) including the joint member (710) observed in the XY plane, FIG. 12c is a right side view of the joint assembly (700) observed in the YZ plane, and FIG. 12d is a plan view of the joint assembly (700) observed in the XZ plane.

[0069] Referring to FIGS. 12a through 12d, the joint assembly (700) comprises a joint member (710), a first connecting piece (720), a second connecting piece (730), a third connecting piece (740), and a fourth connecting piece (750). The first connecting piece (720) is positioned to cover each of the first center piece (711), the first extension piece (713), and the second extension piece (714) of the joint member (710). The second connecting piece (730) is positioned to cover the second center piece (712) and the third extension piece (715) of the joint member (710). The third connecting piece (740) is positioned to protrude along the -Y-axis direction from the first connecting piece (720) of the joint member (710) and extend along the X-axis direction. The fourth connecting piece (750) is positioned to protrude along the -Y-axis direction from the second connecting piece (730) of the joint member (710) and extend along the -Z-axis direction.

[0070] When viewed in the XY plane, the joint assembly (700) is rotatably coupled to the second axis rotation cylinder (900) and the first axis rotation cylinder (600). When viewed in the YZ plane, the joint assembly (700) is rotatably coupled to the second axis rotation cylinder (900) and the first axis rotation cylinder (600). When viewed in the XZ plane, the joint assembly (700) is rotatably coupled to the second axis rotation cylinder (900) and the first axis rotation cylinder (600). When viewed in the XY plane, the joint assembly (700) is rotatably coupled to the second axis rotation cylinder (900) and the cylinder bracket (800).

[0071] FIG. 13 is a side view illustrating an excavator equipped with a pruning saw for mounting on an excavator as shown in FIG. 1.

[0072] Referring to Fig. 13, the pruning saw for the excavator can be mounted on the excavator arm, so it can be used without separate special equipment, and can perform cutting of road-encroaching tree branches with ease of installation and great versatility.

[0073] During operation, the pruning saw for excavator mounting of the present invention is firmly mounted to the arm of the excavator by means of a clamp link (500), and the mounted pruning saw for excavator mounting is moved to the position of the branch to be worked on.

[0074] First, the fixed link firmly secures the branch to prevent it from shaking or slipping during the cutting process.

[0075] Next, the motor (310) operates to rotate the circular blade at high speed and perform branch cutting. The cutting angle is adjusted in the up-and-down tilt direction by the second axis rotation cylinder (900) and in the left-and-right direction by the first axis rotation cylinder (600). This allows for various cutting positions regardless of the position and direction of the branch, and significantly improves cutting efficiency.

[0076] Shaking that occurs during the pruning process of the tree branches is corrected by the support assembly (1100).

[0077] Since the pruning saw is firmly mounted to the arm of the excavator by the clamp link (500), the overall stability of the device is increased, and it can be used without separate special equipment, and it is easy to install and highly versatile.

[0078] Since multi-axis rotation is possible by the first axis rotation cylinder (600) and the second axis rotation cylinder (900), the circular blades can be freely adjusted up and down and left and right, allowing for accurate and efficient cutting of tree branches extending in various directions regardless of the excavator's position.

[0079] The fixed link firmly secures the cutting target, preventing vibration or slippage during cutting, thereby improving the cutting stability of roadside tree branches.

[0080] The high-speed cutting of the circular blade driven by the motor (310) improves the work speed and reduces reliance on manpower for high-altitude work, making it efficient for managing large-scale street trees.

[0081] The support assembly (1100) prevents shaking of the device and stably supports the pruning saw mounted on the excavator before and after pruning work, thereby improving work efficiency and safety.

[0082] As described above, according to the present invention, branches can be safely cut at high altitudes by being mounted on an excavator, and since multi-axis rotation is possible by being equipped with a first axis rotation cylinder and a second axis rotation cylinder, street tree branches at various angles can be efficiently cut. Accordingly, cutting precision, work efficiency, safety, maintainability, and versatility can be simultaneously improved through the fusion of an excavator and a pruning saw. In particular, through the structural features of the multi-axis rotation structure, fixed link, and support assembly, branches at high altitudes can be cut quickly and safely, and practical value can be enhanced in actual work environments such as large-scale street tree management.

[0083] Although the invention has been described above with reference to embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as described in the following claims. Explanation of the symbols

[0084] 100 : Support body 200 : Cutting part 210: 1st circular blade 220: 2nd circular blade 230: 3rd Circular Blade 240: 4th Circular Blade 300: Blade drive unit 310: Motor 320 : Drive pulley 330 : Belt unit 340 : Driven pulley unit 342 : 1st driven pulley 344 : 2nd passive pulley 346 : 3rd passive pulley 348 : 4th passive pulley 3421 : V-ribbed pulley 3422: 1st bearing 3423: 1st spacer 3424 : Second bearing 3425 : Bearing housing 3426: 2nd Spacer 3427: 1st Shaft 350: Belt tensioner unit 352: 1st belt tensioner 354: 2nd belt tensioner 356: 3rd belt tensioner 360 : Tension pulley unit 362 : 1st tension pulley 364 : 2nd Tension Pulley 366 : 3rd Tension Pulley 3621: Idle roller 3622: Third bearing 3623: 3rd spacer 3624: 4th bearing 3625: 4th Spacer 3626: 2nd Shaft 400 : Main body 500 : Clamp link 600: 1st axis rotating cylinder 700: Joint assembly 710 : Joint member 800 : Cylinder bracket 810: Bracket body 820: First fastening member 830: Second fastening member 900: Second shaft rotation cylinder 1000: Fixed link unit 1010: 1st fixed link 1020 : 2nd fixed link 1030 : 3rd fixed link

Claims

Claim 1 Support body; a cutting unit including a plurality of circular blades and coupled to the support body; a blade drive unit coupled to the support body and driving the circular blades; a main body; a clamp link coupled to the main body to quickly and safely mount or detach from an excavator arm; a first axis rotation cylinder, one end of which is rotatably coupled to the main body to adjust the circular blades left and right; a joint assembly rotatably connected to the other end of the first axis rotation cylinder; a cylinder bracket rotatably connected to the joint assembly; and a second axis rotation cylinder, one end of which is coupled to the joint assembly and the other end of which is rotatably coupled to the cylinder bracket to adjust the circular blades up and down, wherein the blade drive unit comprises: a motor coupled to the support body; a drive pulley connected to the central axis of the motor and transmitting rotational force according to the rotation of the motor; a belt unit including a plurality of belts and transmitting rotational power generated from the motor to the cutting unit; a driven pulley unit including a plurality of driven pulleys and rotating according to the rotation of the drive pulley; and a belt tensioner unit including a plurality of belt tensioners. A pruning saw for mounting on an excavator, characterized by including a plurality of tension pulleys and a tension pulley unit for adjusting the tension of the belt unit. Claim 2 delete Claim 3 A pruning saw for excavator mounting according to claim 1, characterized in that the circular blades are connected to the shafts of each of the driven pulleys. Claim 4 A pruning saw for mounting on an excavator according to claim 1, wherein the joint assembly is rotatably connected to the second axis rotation cylinder and the first axis rotation cylinder when observed in the XY plane. Claim 5 A pruning saw for mounting on an excavator according to claim 1, wherein the joint assembly is rotatably connected to the second axis rotation cylinder and the first axis rotation cylinder when observed in the YZ plane. Claim 6 A pruning saw for mounting on an excavator according to claim 1, wherein the joint assembly is rotatably connected to the second axis rotation cylinder and the first axis rotation cylinder when observed in the XZ plane. Claim 7 A pruning saw for mounting on an excavator according to claim 1, wherein the joint assembly is rotatably connected to the second axis rotation cylinder and the cylinder bracket when observed in the XY plane. Claim 8 Support body; a cutting part including a plurality of circular blades and connected to the support body; a blade driving part connected to the support body and driving the circular blades; a main body; a clamp link connected to the main body to quickly and safely mount or detach from the excavator arm; a first axis rotation cylinder, one end of which is rotatably connected to the main body to adjust the circular blades left and right; a joint assembly connected to the other end of the first axis rotation cylinder to adjust the circular blades left and right; a cylinder bracket connected to the joint assembly to adjust the circular blades up and down, one end of which is connected to the joint assembly and the other end of which is rotatably connected to the cylinder bracket to adjust the circular blades up and down, wherein the joint assembly includes a joint member, and the joint member includes a first central piece having a square shape and a first central hole formed in the center; a first extension piece having a first extension hole formed in the center and bent vertically from the first side of the first central piece; A pruning saw for mounting on an excavator, characterized by comprising: a second extension hole formed in the center, a second extension piece bent vertically from the second side of the first center piece and extended parallel to the first extension piece; a second center piece bent vertically from the third side of the first center piece; and a third extension piece formed in the center and bent vertically from the first side of the second center piece. Claim 9 A pruning saw for mounting on an excavator according to claim 1, further comprising a fixing link unit that is fastened to protrude toward the cutting target from the support body and fixes the cutting target to prevent vibration or slippage during cutting, thereby improving the cutting stability of a tree branch. Claim 10 An excavator-mounted pruning saw according to claim 1, further comprising a support assembly that prevents shaking of the device and stably supports the excavator-mounted pruning saw before and after pruning operations to improve work efficiency and safety.

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