Attachments for construction machinery

Abstract

In attachments for construction machinery used to cut materials such as wood, the resistance of the stopper against which the material being cut is pressed when removing the material that has become embedded in the cutting blade is improved. [Solution] The attachment 10, used in conjunction with the arm 3 of the construction machine 1, comprises a fixed-side frame 11 fixed to the arm 3, a cutting device 25 having a cutting blade 12 rotatably supported on the fixed-side frame 11, a pair of stoppers 28 protruding from the fixed-side frame 11 so as to face each other with a gap through which the cutting blade 12 passes, and a reinforcing member 29 stretched between the tips of the pair of stoppers 28.

Description

Technical Field

[0001] The present invention relates to an attachment for construction machinery used for cutting objects to be cut such as wood.

Background Art

[0002] Patent Document 1 describes a treatment device for waste such as a hydraulic excavator as an attachment for construction machinery used for cutting objects to be cut. This treatment device includes a cutting device for cutting an object to be cut, and a corner device or the like that can remove the object to be cut that has bitten into the cutting blade and re-cut it. The corner device consists of a pair of corner bodies erected at the rear end of the blade receiver of the receiving frame. When the object to be cut bites into the cutting blade, the cutting blade is rotated in the backward direction, and the object to be cut is pressed against each corner body of the corner device, so that the object to be cut can be removed from the cutting blade.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the treatment device (attachment for construction machinery) described in Patent Document 1, when the object to be cut bites firmly into the cutting blade, in order to remove the object to be cut from the cutting blade, it is necessary to increase the rotational force for retracting the cutting blade. In such a case, a large force acts on each corner body (stopper) of the corner device from the object to be cut. However, since each corner body of the corner device is supported only at one end side (that is, it is a cantilever), it is likely to be distorted when a large force acts.

[0005] This invention has been made in view of these circumstances, and aims to improve the resistance of a stopper against which a workpiece is pressed when removing a workpiece that has become embedded in the cutting blade, in an attachment for construction machinery used for cutting workpieces such as wood. [Means for solving the problem]

[0006] To solve the above-mentioned problems, the first invention is an attachment used in connection with the arm of a construction machine, comprising: a fixed-side frame fixed to the arm; a cutting device having a cutting blade rotatably supported on the fixed-side frame; a pair of stoppers protruding from the fixed-side frame so as to face each other with a gap through which the cutting blade passes; and a reinforcing member spanning between the tips of the pair of stoppers.

[0007] The second invention is that, in the first invention, the cutting device has a cutting blade and a blade receiving portion provided on the fixed frame, and in a side view of the attachment, the surface of the stopper on the blade receiving portion side is bent or curved in the longitudinal direction of the stopper toward the retraction direction of the cutting blade.

[0008] The third invention is that, in the first invention, in a side view of the attachment, the reinforcing member comprises a main body portion to which a pair of stoppers are connected, and a first claw portion that protrudes from the main body portion toward the retraction direction of the cutting blade.

[0009] The fourth invention is the third invention, wherein, in a side view, the reinforcing member further comprises a second claw portion that protrudes from the main body toward the direction in which the cutting blade advances.

[0010] The fifth invention further comprises the gripping device of the first invention having a rotating arm rotatably supported on a fixed frame, wherein the rotating arm is positioned on the opposite side from the cutting blade to the fixed frame in a side view of the attachment, and in a side view, the tip of the fixed frame has one side that constitutes a blade holder for the cutting blade and the other side that constitutes a fixed arm that grips the object to be moved together with the rotating arm. [Effects of the Invention]

[0011] In this invention, a pair of stoppers are provided that protrude from the fixed frame so as to face each other with a gap through which the cutting blade passes, and a reinforcing member is spanned between the tips of the pair of stoppers. Therefore, when the object to be cut is pressed against the stopper to remove it from the cutting blade, the concentration of stress in the stopper is reduced compared to when there is no reinforcing member. Consequently, the resistance of the stopper against which the object to be cut is pressed can be improved. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 shows an attachment for construction machinery according to an embodiment, and a side view of construction machinery to which the attachment for construction machinery is attached. [Figure 2] Figure 2 is a perspective view of the main part of an attachment for construction machinery according to an embodiment. [Figure 3] Figure 3(A) shows the situation in which the object to be moved is hooked and moved by the first claw portion of the attachment according to the embodiment, and Figure 3(B) shows the situation in which the object to be moved is hooked and moved by the second claw portion of the attachment. [Modes for carrying out the invention]

[0013] Embodiments of the present invention will be described in detail below with reference to the drawings. Note that the following embodiments are examples of the present invention and are not intended to limit the scope of the present invention, its applications, or its uses.

[0014] This embodiment is an attachment 10 for construction machinery according to the present invention. The attachment 10 is used by being attached to the tip of the arm 3 of the construction machine 1.

[0015] As shown in Figure 1, the attachment 10 comprises a fixed frame 11 fixed to the arm 3, a cutting device 25 having a cutting blade 12 rotatably supported relative to the fixed frame 11, and a gripping device 35 having a rotating arm 13 rotatably supported relative to the fixed frame 11. Hereinafter, with reference to the state in the construction machine 1 where the arm 3 is on the front side of the cockpit 5 and the tips of the arm 3 and the fixed frame 11 are pointing downwards (the state in Figure 1), the front side of the cockpit 5 of the attachment 10 will be referred to as the "front side," the opposite side as the "rear side," the tip side of the arm 3, etc. as the "lower side," and the opposite side as the "upper side."

[0016] The fixed-side frame 11 has a frame body portion 20 that rotatably supports the cutting blade 12, and a blade receiving portion 21 that is continuously provided below the frame body portion 20. In Figure 1, the boundary between the frame body portion 20 and the blade receiving portion 21 is represented by a dashed line X. The blade receiving portion 21 is provided on the fixed-side frame 11 and together with the cutting blade 12 constitutes the cutting device 25.

[0017] The frame body 20 is formed in a vertically elongated shape when viewed from the side of the attachment 10 (hereinafter simply referred to as "side view"). This side view corresponds to the view from the front side of the paper in Figure 1. The frame body 20 is attached to the arm 3 so that most of it follows the rear side of the arm 3. The cutting blade 12 is rotatably attached to the tip of the frame body 20 with a pivot point on the rotation axis. The rotation axis of the cutting blade 12 is positioned slightly forward on the tip of the frame body 20.

[0018] The cutting blade 12 has a roughly fan-shaped cutting saw blade 12a on the side facing the blade receiving portion 21. The cutting saw blade 12a extends in an arc shape from near the rotation axis.

[0019] Here, attachment 10 is provided with arm attachment parts 30a and 30b on the frame main body part 20 and the cutting blade 12 respectively. The first arm attachment part 30a is a part where the tip of arm 3 is connected by a bucket pin. The first arm attachment part 30a is provided on the frame main body part 20 near the tip in the longitudinal direction and at the front position in the front-rear direction. The first arm attachment part 30a is disposed diagonally above the front side of the rotation axis of the cutting blade 12. The second arm attachment part 30b is a part where one end of the H link 36 is rotatably connected by an H link pin. The second arm attachment part 30b is provided at a part protruding from the cutting edge side of the cutting blade 12.

[0020] Arm 3 is provided with a bucket cylinder 31, an H link 36, and a side link 37. The cylinder tube of the bucket cylinder 31 is rotatably supported on the front part of arm 3. One end of the side link 37 is rotatably connected to the tip side of arm 3. The cylinder rod 31a of the bucket cylinder 31 is rotatably connected to the other end of the H link 36 and the other end of the side link 37 respectively.

[0021] The blade receiving part 21 extends downward from the tip on the rear side of the frame main body part 20. In a side view, the front part of the blade receiving part 21 becomes a part for receiving the cutting blade 12. The blade receiving part 21 extends along the vertical direction at the tip side and is curved in an arc shape at the root side. In the cutting device 25, the cutting blade 12 rotates as the cylinder rod 31a of the bucket cylinder 31 advances and retreats. Also, the rear part of the cutting blade 12 constitutes the fixed side arm 15.

[0022] By the way, in the cutting device 25, the cutting saw blade 12a of the cutting blade 12 may bite into the workpiece 50 such as wood and the workpiece 50 may not come off from the cutting saw blade 12a (see FIG. 1). As shown in FIGS. 1 and 2, the cutting device 25 further includes a pair of stoppers 28 for removing the workpiece 50 from the cutting saw blade 12a and a reinforcing member 29 bridged between the tip ends of the pair of stoppers 28. In FIG. 2, the description of the rotating arm 13 is omitted.

[0023] The pair of stoppers 28 project angularly forward and obliquely downward from the frame main body 20. Each stopper 28 is an elongated member in side view. The pair of stoppers 28 are attached to the outer side surfaces of the respective frame main bodies 20 so as to sandwich the frame main body 20. The pair of stoppers 28 face each other with a gap through which the cutting blade 12 passes. Each stopper extends beyond the distal portion of the cutting blade 12 that is farthest from its rotation axis. The gap surrounded by the pair of stoppers 28 and the reinforcing member 29 allows the cutting blade 12 to pass through.

[0024] The base side of each stopper 28 is fixed to the outer side surface of the frame main body 20 at a position near the longitudinal end and on the front side in the front-rear direction. Each stopper 28 extends forward and obliquely downward with respect to the longitudinal direction of the frame main body 20 (the extending direction of the arm 3). In the present embodiment, each stopper 28 is slightly bent forward at the intermediate portion. In side view, the surface 28a on the blade receiving portion side of each stopper 28 is bent toward the retracting direction side of the cutting blade 12 in the middle of the length direction. Note that the surface 28a on the blade receiving portion side of each stopper 28 may be curved in an arc shape or a crescent shape.

[0025] As shown in FIG. 2, the reinforcing member 29 is an elongated plate-like member. The tips of the respective stoppers 28 are fixed to each end of the reinforcing member 29 in the longitudinal direction Y on the inner surface. In side view, the reinforcing member 29 includes a main body portion 29a to which the pair of stoppers 28 are connected, a first claw portion 29b that projects from the main body portion 29a toward the retracting direction side of the cutting blade 12, and a second claw portion 29c that projects from the main body portion 29a toward the advancing direction side of the cutting blade 12 (see the enlarged view within the broken line portion in FIG. 1).

[0026] The main body portion 29a is a portion of the reinforcing member 29 that exists within the length range of the line 28e that constitutes the tip of the stopper 28 in side view. In the present embodiment, the main body portion 29a has a substantially rectangular shape with the extending direction of the line 28e as the longitudinal direction in side view.

[0027] Each claw portion 29b, 29c protrudes from the short side portion of the main body portion 29a. In this embodiment, each claw portion 29b, 29c has a triangular shape in side view. The angles θb, θc at the tips of each claw portion 29b, 29c are, for example, 60 degrees or less, preferably 45 degrees or less. In this embodiment, the two lines defining the angles θb, θc at the tips of each claw portion 29b, 29c in side view are straight lines, but if these two lines include a curve, the angles θb, θc are defined using the tangent at the tip to that curve.

[0028] The rotating arm 13 is rotatably supported at the rear position of the frame body 20. In a side view, the rotating arm 13 is positioned opposite the fixed frame 11 to the cutting blade 12. The front of the rotating arm 13 is curved in a roughly arc shape. In a side view, one side of the tip of the fixed frame 11 forms the blade holder for the cutting blade 12, and the other side forms the fixed arm 15 that, together with the rotating arm 13, clamps the object to be moved 51.

[0029] The cylinder rod of the hydraulic cylinder 32 for the arm is rotatably connected to the rear side of the rotating arm 13. The cylinder tube of the hydraulic cylinder 32 for the arm is rotatably connected to the upper side of the frame body 20. Multiple jagged protrusions are provided on the front side of the rotating arm 13 to facilitate gripping the object to be moved 51. Multiple jagged protrusions are also provided on the fixed arm 15, which is opposite the front side of the rotating arm 13.

[0030] [Effects of the Embodiment] In this embodiment, a reinforcing member 29 is spanned between the tips of a pair of stoppers 28. Therefore, when the object to be cut 50 that has become embedded in the cutting blade 12 is pressed against the stopper 28 to remove it, the concentration of stress in the stopper 28 is reduced compared to when the reinforcing member 29 is not present. Consequently, the resistance of the stopper 28 against which the object to be cut 50 is pressed can be improved.

[0031] In this embodiment, the surface 28a of the stopper 28 on the blade receiving portion 21 side is bent or curved in the longitudinal direction of the stopper 28 toward the retraction direction of the cutting blade 12. Therefore, when the object to be cut 50 that has become embedded in the cutting blade 12 is pressed against the stopper 28 in order to remove it, the force acting from the object to be cut 50 on the stopper 28 is less likely to concentrate toward the base of the stopper 28, and stress concentration in the stopper 28 is alleviated.

[0032] In this embodiment, in a side view, the reinforcing member 29 is provided with a first claw portion 29b. Therefore, as shown in Figure 3(A), a movable object 51, such as a piece of wood placed on the ground, can be hooked onto the first claw portion 29b and moved. The reinforcing member 29 is also provided with a second claw portion 29c. Therefore, as shown in Figure 3(B), a movable object 51, such as a piece of wood placed on the ground, can be hooked onto the second claw portion 29c and moved. In this embodiment, the movable object 51 can be hooked onto the claw portions 29b, 29c of the attachment 10 and moved not only when the arm 3 is moved to move the attachment 10 forward, but also when the attachment 10 is moved to move it backward.

[0033] In this embodiment, since the attachment 10 is equipped with a gripping device 35 having a rotating arm 13 and a fixed arm 15, it can also grip and move the object to be moved 51.

[0034] [Other embodiments] In the above embodiment, multiple jagged protrusions are provided on the rear portion of the blade receiving portion 21 that constitutes the fixed arm 15, but these multiple protrusions may be omitted, and the configuration of the fixed arm 15 is not limited.

[0035] In the embodiment described above, the gripping device 35 may be omitted. [Industrial applicability]

[0036] The present invention is applicable to rotating devices and the like that installed on attachments for construction machinery. [Explanation of Symbols]

[0037] 1. Construction machinery 3 Arms 10 Attachments 11 Fixed side frame 12 cutting blade 12a cutting saw blade 13 Rotating Arms 15 Fixed side arm 20 Frame main body 21 Blade receiving section 25 Cutting device 28 Stopper 29 Reinforcement members 29a Main body 29b 1st claw part 29c 2nd claw part 30a First arm mounting section 30b Second arm mounting section 31 Bucket Cylinder 32 Hydraulic cylinder for arms 35 Gripping device 36 H-Link 37 Side Links 50 Object to be cut 51 Object to be moved

Claims

1. An attachment used by connecting to the arm of a construction machine, A fixed frame that is fixed to the aforementioned arm, A cutting device having a cutting blade rotatably supported on the fixed frame, A pair of stoppers protruding from the fixed-side frame so as to face each other across a gap through which the cutting blade passes, An attachment comprising a reinforcing member stretched between the tips of the pair of stoppers.

2. The cutting device has, in addition to the cutting blade, a blade receiving portion provided on the fixed side frame, The attachment according to claim 1, wherein, in a side view of the attachment, the surface of the stopper on the blade receiving side is bent or curved in the longitudinal direction of the stopper toward the retraction direction of the cutting blade.

3. The attachment according to claim 1, wherein, in a side view of the attachment, the reinforcing member comprises a main body portion to which the pair of stoppers are connected, and a first claw portion that protrudes from the main body portion toward the retraction direction of the cutting blade.

4. The attachment according to claim 3, wherein, in the side view, the reinforcing member further comprises a second claw portion that protrudes from the main body portion toward the direction in which the cutting blade advances.

5. The gripping device further comprises a rotating arm rotatably supported on the fixed frame, The rotating arm is positioned on the side opposite to the cutting blade relative to the fixed frame in a side view of the attachment. The attachment according to claim 1, wherein, in the side view, the tip of the fixed frame has one side that constitutes a blade holder for the cutting blade and the other side that constitutes a fixed arm that, together with the rotating arm, grips the object to be moved.

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