Crusher

Abstract

To provide a crusher capable of suppressing a pair of blade frames opening in the thickness direction when shearing a steel material and the like.SOLUTION: A crusher 10 includes: a first blade frame 1 and a second blade frame 2; and a shaft structure 20 provided at a body frame 4, and for rotatably connecting the first blade frame 1 and the second blade frame 2. The shaft structure 20 includes: a pin member 6; a cylindrical first bearing part 7 integrated at the first blade frame 1, and for rotatably supporting the pin member 6; and a second bearing part 8 integrated at the second blade frame 2, and for rotatably supporting the first bearing part 7. In the thickness direction of the first blade frame 1, out of a blade part 1a of the first blade frame 1 and a blade part 2a of the second blade frame 2, with the blade part 1a side of the first blade frame 1 being the surface side, the second bearing part 8 is sandwiched by a pair of holding parts 14a in the body frame 4, and comes into slide contact with the surface side in the vicinity of the first bearing part 7 in the first blade frame 1.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a crusher or the like used for dismantling structures and machines. [Background technology]

[0002] 2. Description of the Related Art Conventionally, crushers used for dismantling structures, machines, etc. are known. This type of crusher is used by being coupled to the arm of a construction machine.

[0003] Patent Document 1 describes a demolition attachment as this type of crusher. This demolition attachment has a single-action configuration in which a common rotation shaft for a pair of movable jaws is provided on the attachment body. This demolition attachment has a sliding surface integral with the movable jaw on the opposite side of the opposing portion across the rotation shaft, and the sliding surfaces are brought into sliding contact with each other at least in the opening and closing range of the movable jaw where the opposing portions begin to shear the steel material by sandwiching it. As a result, if the opposing portions try to separate when the steel material is sheared, the sliding surfaces will instead press against each other, preventing the movable jaw from opening. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-270564 A Summary of the Invention [Problem to be solved by the invention]

[0005] Meanwhile, the inventors of the present application have come up with another mechanism for preventing a pair of blade frames (corresponding to the "movable jaws" in Patent Document 1) from opening when shearing steel materials, etc., in a crusher that uses a common rotating shaft for the pair of blade frames.

[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a crusher that can prevent a pair of blade frames from opening in the thickness direction when shearing steel material or the like. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, a first invention is a crusher comprising a main body frame, a first blade frame and a second blade frame, an axis structure provided on the main body frame and rotatably connecting the first blade frame and the second blade frame, and a drive device for driving the first blade frame and the second blade frame to open and close, wherein the axis structure comprises a pin member, a cylindrical first bearing portion integrated with the first blade frame, with the pin member disposed on the inside and supporting the pin member rotatably, and a second bearing portion integrated with the second blade frame, with the first bearing portion disposed on the inside and supporting the first bearing portion rotatably, and in the thickness direction of the first blade frame, the blade portion side of the first blade frame out of the blade portions of the first blade frame and the blade portions of the second blade frame is the front side, and the second bearing portion is sandwiched between a pair of retaining portions in the main body frame and comes into sliding contact with the front side of the first blade frame in the vicinity of the first bearing portion.

[0008] The second invention is the first invention, wherein the second bearing portion has a hook portion that is integrated with the second blade frame and formed into a hook shape when viewed from the front, and a cap portion that can be freely attached and detached to the hook portion, and when the cap portion is attached to the hook portion, the bearing surface of the second bearing portion is formed by the arc-shaped inner surface of the hook portion and the arc-shaped inner surface of the cap portion.

[0009] A third invention is the second invention, wherein the hook portion includes a pair of hook portions facing each other with a gap therebetween, and a base portion integrated with the bases of both of the pair of hook portions; The pair of hook portions are provided to sandwich the vicinity of the first bearing portion of the first blade frame. Effect of the Invention

[0010] In the present invention, when steel or the like is sheared, if an object to be crushed is sandwiched between the pair of blade frames, causing the first blade frame to open to the front side and the second blade frame to open to the back side, the second bearing portion integrated with the second blade frame is sandwiched between the pair of holders in the main frame, and the second bearing portion slides against the front side of the first blade frame near the first bearing portion. This prevents the first blade frame from opening to the front side and the second blade frame from opening to the back side. According to the present invention, when steel or the like is sheared, it is possible to prevent the pair of blade frames from opening in the thickness direction. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a front view of a crusher according to an embodiment. [Diagram 2] FIG. 2 is a schematic cross-sectional view of the shaft structure of the crusher. [Diagram 3] Figure 3(a) is a front view of a pair of blade frames of the crusher disassembled and with the cap portion removed, Figure 3(b) is a front view of a pair of blade frames of the crusher disassembled and with the cap portion attached, Figure 3(c) is an oblique view of the hook portion of the second bearing portion in the crusher, and Figure 3(d) is an arrow view of the second blade frame viewed from the X direction. [Figure 4] FIG. 4 is a view of a pair of blade frames viewed in the direction along the blade surface, where FIG. 4(a) shows a state where there is no object to be crushed, and FIG. 4(b) shows a state where an object to be crushed is being cut. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that the following embodiment is merely an example of the present invention, and is not intended to limit the scope of the present invention, its applications, or its uses.

[0013] [Structure of the crusher] This embodiment is a crusher (cutting device) 10 that is connected to the arm of a construction machine when used. As shown in Fig. 1, the crusher 10 includes a main body frame 4, a pair of blade frames (movable jaws) 1, 2, a shaft structure 20 that rotatably connects the pair of blade frames 1, 2, a drive unit 3 that drives the pair of blade frames 1, 2 to open and close, and a connection part 5 for connecting to the arm of the construction machine.

[0014] The main body frame 4 has a pair of plate portions 14 held at a fixed distance. The plate portions 14 are flat. The main body frame 4 has a vertically elongated shape when viewed from the front. The main body frame 4 is provided with an axis structure 20 on one side in the longitudinal direction (the lower side in FIG. 1), and a connecting portion 5 is attached to the opposite side. The lower portions of the pair of plate portions 14 on the axis structure 20 side constitute a pair of holding portions 14a that sandwich a second bearing portion 8 described later. On the connecting portion 5 side of the main body frame 4, connecting points for a hydraulic cylinder 3 described later are provided symmetrically about the longitudinal center line.

[0015] The blade frames 1, 2 are arranged so that their inner portions face each other. At least the base side of the inner side of each blade frame 1, 2 is provided with blade portions 1a, 2a used when cutting steel materials and the like. The blade portion 1a of the first blade frame 1 and the blade portion 2a of the second blade frame 1 are arranged slightly offset in the thickness direction of each blade frame 1, 2 (see FIG. 4(a)). In the thickness direction, the blade portion 1a side of the blade portion 1a of the first blade frame 1 and the blade portion 2a of the second blade frame 1 is referred to as the front side.

[0016] The drive unit 3 is composed of a pair of hydraulic cylinders 3. In the crusher 10, one of the end of the hydraulic cylinder 3 on the cylinder 3a side and the tip of the piston rod 3b is rotatably connected to the main body frame 4, and the other is rotatably connected to the outer end of the base side of the blade frames 1, 2. The pair of blade frames 1, 2 open and close as the piston rod 3b of the pair of hydraulic cylinders 3 advances and retreats.

[0017] 2, shaft structure 20 includes a straight, cylindrical pin member 6, a cylindrical first bearing portion 7 on the inside of which pin member 6 is disposed and which rotatably supports pin member 6, and a second bearing portion 8 on the inside of which first bearing portion 7 is disposed and which rotatably supports first bearing portion 7. Shaft structure 20 has a double bearing structure.

[0018] As shown in Figs. 3(a)-(b), the first bearing portion 7 is integrated with the base side (upper side in Fig. 3) of the inside (blade side) of the first blade frame 1. The first bearing portion 7 is formed in a cylindrical shape as described above, and the pin member 6 is inserted into the through hole 7a on the inside. The first blade frame 1 is joined to the middle height of the outer circumferential surface of the first bearing portion 7 (see Fig. 2). The portion of the first bearing portion 7 that protrudes from one side of the first blade frame 1 and the portion that protrudes from the other side of the first blade frame 1 form boss portions 7b.

[0019] The second bearing portion 8 has a hook portion 11 integrated with the base side (upper side in FIG. 3) on the inside (blade side) of the second blade frame 2, and a cap portion 12 detachably attached to the hook portion 11. The hook portion 11 and the cap portion 12 both have arc-shaped inner surfaces 11a, 12a when viewed from the front. The hook portion 11 is provided so that the inner surface 11a faces outward. The cap portion 12 is attached to the hook portion 11 by a fixing member 13 such as a screw. In this state, the arc-shaped inner surface 11a of the hook portion 11 and the arc-shaped inner surface 12a of the cap portion 12 form a bearing surface of the second bearing portion 8.

[0020] When attaching the second blade frame 2 to the first blade frame 1, the first bearing portion 7 is first hooked onto the hook portion 11, and then the cap portion 12 is attached to the hook portion 11.

[0021] 3(a) and 3(b), the hook portion 11 is formed in a hook shape when viewed from the front. When viewed from the front, the width of the hook portion 11 gradually narrows from the base side to the tip.

[0022] As shown in Fig. 3(c) and Fig. 3(d), the hook portion 11 has a slit (notch) 15 for passing the first blade frame 1 in the middle of the thickness direction. The slit 15 extends in the extension direction of the hook portion 11, and is formed from the installation position of the connection member 19 described later to the position of the dotted line X (see Fig. 3(a)). The hook portion 11 has a pair of hook portions 16 facing each other through the gap of the slit 15, a base portion 17 integrated with the roots of both of the pair of hook portions 16, and a plate-shaped connection member 19 connecting the tip sides of the pair of hook portions 16 to each other. The inner surface of each hook portion 16 is a flat surface. The pair of hook portions 16 are provided parallel to each other. The pair of hook portions 16 are provided so as to sandwich the vicinity 1b of the first blade frame 1 of the first bearing portion 7.

[0023] In the shaft structure 20, a bolt 9 is fastened to each end of the pin member 6 (see FIG. 2). The bolt 9 is pressed against the retaining portion 14a (plate portion 14). The pair of retaining portions 14a sandwich the pair of hook portions 16 and the base portion 17. The pair of retaining portions 14a is kept at a constant distance, and the pair of hook portions 16 is also kept at a constant distance.

[0024] When the pair of blade frames 1, 2 are opened and closed, the end faces of the bosses 7b of the first bearing 7 integrated with the first blade frame 1, the outer surfaces of the pair of hooks 16, the outer surface of the base 17, and the outer surface of the cap 12 are in sliding contact with the pair of plates 14. In addition, the inner surfaces of the pair of hooks 16 are in sliding contact with the portions 1b of the first blade frame 1 near the first bearing 7.

[0025] In the shaft structure 20, bushes 21, 22 are provided as a lubrication structure between the pin member 6 and the first bearing portion 7 and between the first bearing portion 7 and the second bearing portion 8. Between the pin member 6 and the first bearing portion 7, bushes 21 are provided on both the front and back sides. Also, between the first bearing portion 7 and the second bearing portion 8, bushes 22 are provided on both the front and back sides. A gap is formed between the bushes 21, 22 on the front and back sides.

[0026] [Effects of the embodiment] In this embodiment, even if the first blade frame 1 opens to the front side and the second blade frame 2 opens to the back side when shearing steel material or the like, the second bearing portion 8 integrated with the second blade frame 2 is sandwiched between a pair of holding portions 14a of the main frame 4, and a portion 1b near the first bearing portion 7 of the first blade frame 1 is sandwiched between a pair of hook portions 16 of the second bearing portion. This prevents the first blade frame 1 from opening to the front side and the second blade frame 2 from opening to the back side, making it possible to prevent the pair of blade frames 1, 2 from opening in the thickness direction when shearing steel material or the like.

[0027] In this embodiment, the pair of hooks 16 are provided to sandwich the portion 1b adjacent to the first bearing 7 in the first blade frame 1, so that the height dimension (length of the boss portion) of the first bearing 7 and the second bearing 8 is relatively large. Therefore, even if the dismantling attachment described in Patent Document 1 does not have a sliding surface provided on the opposite side to the opposing portion, the shaft structure 20 with a double bearing structure can stably support the swinging rotation of each of the blade frames 1 and 2. The shaft structure 20 according to this embodiment is useful for a crusher that is required to have a small gap in the thickness direction between the pair of blade frames 1 and 2.

[0028] In this embodiment, each of the blade frames 1, 2 is provided with a support portion (support stand) 30 for supporting the object to be crushed 25 (object to be cut) such as a steel bar when the object to be crushed 25 tends to tilt relative to each of the blade frames 1, 2 during cutting (see FIG. 4). The first blade frame 1 is provided with the support portion 30 on its back surface, and the second blade frame 2 is provided with the support portion 30 on its front surface.

[0029] The support portion 30 is formed in a plate shape, extends from one side of each blade frame 1, 2, and has a tip facing inward. The tip of the support portion 30 constitutes a support end 30a. The support end 30a extends along the cutting edges of the blade portions 1a, 2a in a front view (see FIG. 1(a)). In the first blade frame 1, the support end 30a is located diagonally outside the back side of the cutting edge of the blade portion 1a in a cross-sectional view. In the second blade frame 2, the support end 30a is located diagonally outside the front side of the cutting edge of the blade portion 2a. According to this embodiment, as shown in FIG. 4(b), even if the object to be crushed 25 tilts when the object to be crushed 25 is cut, the object to be crushed 25 is supported by the pair of support portions 30, so that the object to be crushed 25 can be prevented from tilting significantly. Therefore, the pair of blade frames 1, 2 can be prevented from opening due to the object to be crushed 25 tilting significantly. [Industrial Applicability]

[0030] The present invention is applicable to an attachment changing device for changing an attachment mounted on a work machine, etc. [Explanation of symbols]

[0031] 1 First blade frame 2. Second blade frame 3 Drive unit, hydraulic cylinder 4 Main frame 6 Pin member 7 First bearing part 7a Through hole 7b Boss part 8 Second bearing part 10 Crusher 11 Hook part 12 Cap section 13 Fixing parts 14 Plate section 15 Cut 16 Hook section 17 Base 20 axis structure 21,22 Bush 25 Crushing object 30 Support stand 30a Support terminal

Claims

1. A body frame, A first blade frame and a second blade frame, a shaft structure provided on the main body frame and rotatably connecting the first blade frame and the second blade frame; A crusher including a drive device that drives the first blade frame and the second blade frame to open and close, The shaft structure is A pin member; a cylindrical first bearing portion that is integrated with the first blade frame, has the pin member disposed therein, and rotatably supports the pin member; a second bearing portion that is integrated with the second blade frame, the first bearing portion is disposed inside the second bearing portion, and the second bearing portion rotatably supports the first bearing portion, In a thickness direction of the first blade frame, a blade portion side of the first blade frame and a blade portion of the second blade frame are defined as a front side, The second bearing portion is sandwiched between a pair of holding portions of the main body frame and is in sliding contact with an outer side of the first blade frame in the vicinity of the first bearing portion.

2. the second bearing portion includes a hook portion that is integrated with the second blade frame and formed into a hook shape in a front view, and a cap portion that is detachably attached to the hook portion, The crusher according to claim 1 , wherein a bearing surface of the second bearing portion is formed by an arcuate inner surface of the hook portion and an arcuate inner surface of the cap portion when the cap portion is attached to the hook portion.

3. The hook portion includes a pair of hook portions facing each other with a gap therebetween, and a base portion integrated with the bases of both of the pair of hook portions, The crusher according to claim 2 , wherein the pair of hook portions are provided so as to sandwich a vicinity of the first bearing portion of the first blade frame.

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