JP7216693B2 - Scissors for demolition and the structure of the insertion body and the tip of the piercing tip of the shears for demolition - Google Patents

Description

(not listed)

The structure of the insertion body of the piercing tip and the tip of the nose, which can suppress the abrasion of the nose tip even when clogging occurs or the insertion body of the piercing tip is caught, and can withstand the force applied to the insertion body of the piercing tip. There is a need for a demolition shearer with

U.S. Pat. No. 7,216,575

FIG. 1 is a perspective view of the right side (from the operator's position) of one embodiment of a demolition shear attachment. 2 is a perspective view of the left side of the demolition shear attachment of FIG. 1; FIG. Figure 3 illustrates the shear attachment of Figure 1 in a general operating position showing movement of the upper jaw relative to the lower jaw during a shearing action; 4 is an exploded perspective view of a jaw pivot of the shear attachment of FIG. 1; FIG. FIG. 5 is an enlarged view of FIG. 1 showing the shear attachment; FIG. 6 is the same view as FIG. 5, but with the blade insert and the piercing tip insert removed; Figure 7 is an enlarged view of Figure 2 showing the jaws of the shear attachment; FIG. 8 is a perspective view of the lower jaw of FIG. 1, removing the upper jaw and showing more clearly the inserts of the shear blades and the guide blades on the blade side; FIG. 9 is another perspective view of the lower jaw of FIG. 1 excluding the upper jaw, illustrating the guide blade insert and the side blade insert on the guide side. FIG. 10 is the same view as FIG. 7, with the blade insert and the piercing tip insert removed; Figure 11 is the same view of the lower jaw of Figure 9, with the blade insert removed; Figures 12 show various views of an embodiment of a shear blade insert, 12A is a front perspective view, 12B is a front view, 12C is an end view, and 12D is a rear view. Figures 13 show various views of an embodiment of a guide blade insert, 13A in front perspective view, 13B in front view, 13C in end view and 13D in rear view. Figure 14 shows various views of an embodiment of a side blade insert, 14A is a front perspective view, 14B is a rear perspective view, 14C is an end view, 14D is a front view, and 14E is a rear view. . 15 shows various views of an embodiment of a blade-side piercing tip half, 15A front perspective view, 15B rear perspective view, 15C front end view, 15D outer front view, 15E. is a front view of the inside. Figure 16 shows various views of an embodiment of a guide side piercing tip half, 16A front perspective view, 16B rear perspective view, 16C front end view, 16D inner front view, 16E. is a front view of the outside. FIG. 17 is a perspective view of the upper jaw of the shear attachment of FIG. 1 alone, illustrating a state in which the piercing tip insert is disassembled from the snout mount; 18 is an enlarged side view of the upper and lower jaws of the shear attachment of FIG. 1, with the upper jaw in the fully open position; FIG. 19 is an enlarged side view of the upper and lower jaws of the shear attachment of FIG. 1, with the upper jaw in a partially closed position; FIG. 20 is an enlarged side view of the upper and lower jaws of the shear attachment of FIG. 1, just prior to entry of the upper jaw into the elongated groove of the lower jaw; FIG. FIG. 21 is an enlarged side view of the upper and lower jaws of the shear attachment of FIG. 1 with the upper jaw fully closed and nested into an elongated groove in the lower jaw; FIG. 22 is an enlarged side view of the upper and lower jaws showing the force on the stuck penetrating tip. FIG. 23 is an enlarged side view of the upper and lower jaws showing the force exerted on the piercing tip in another hooked condition. FIG. 24 is an enlarged side view of the upper and lower jaws illustrating the forces on the piercing tip when the upper end of the piercing tip is jammed due to wear of the base material at the snout of the upper jaw; there is

In the drawings, the same reference numerals refer to the same or similar parts throughout the several views. Referring to the drawings, FIGS. 1 and 2 are respectively right and left perspective views (from the operator's position) of an embodiment of a shears attachment 10 for demolition. The shear attachment 10 has a body 12 with a front end 14 and a rear end 16 . Those skilled in the art will recognize and understand that the trailing end 16 is operably attached to an excavator boom or arm 18 (FIG. 3), such as by a pivoting attachment 19 or other suitable mounting attachment. It has a structure like At the front end 14 of body 12 is a movable upper jaw 40 and a fixed lower jaw 42 (described in detail below).

Figures 3A-3C show a shear attachment 10 that attaches to a boom or arm 18 of an excavator. They are in their general operating position and illustrate the closing movement of the upper jaw 40 relative to the lower jaw 42 over the object 11 to be sheared. The object 11 to be sheared may be structural members such as I-shaped steel, channel steel, steel plates, steel pipes, materials such as scrap metal, metal plates, or objects suitable for being handled or processed by a shearing machine for demolition. It can be used as material.

1-4, the shear attachment body 12 generally includes steel side plates 20, 22, a top plate 24, and a bottom plate 26 which combine to form a substantially enclosed space. 3A-3C) and other hydraulic components of the shear attachment 10 within this space. A hydraulic actuator 30 is pivotably fixed at the rear end within the body 12 by an actuator fulcrum pin 32 . The actuator fulcrum pin 32 passes through the side plates 20, 22, the internal stiffener plate (not shown) and the clevis 34 of the cylinder rod. The front end of the hydraulic actuator 30 is pivotally attached to the movable upper jaw 40 by a cylinder pin 36 which passes through a clevis 38 in the cylinder body and a hole 39 in the cylinder pin (see also Figure 17). Accordingly, it should be appreciated that, as shown in FIGS. 3A-3C, as hydraulic actuator 30 expands and contracts, upper jaw 40 is forced relative to the longitudinal axis of jaw pivot assembly 60 (described below). It rotates to open and close the upper jaw 40 relative to the lower jaw 42 . An inspection window (FIG. 2) with an inspection cover 25 is provided in the top plate to allow access to the interior of body 12 for installation, maintenance, repair and repair of hydraulic actuators and other components of the hydraulic system. It is also possible to

As best seen in FIGS. 4, 8 and 9, the jaw projections 44, 46 on either side of the front end 14 of the body 12 have hub holes 48, 50 therein. A jaw pivot assembly 60 inserted into the hub holes 48, 50 and into the pivot hole 54 (see FIG. 17) supports the upper jaw 40 in a pivotable manner.

The jaw pivot assembly 60 includes flanged bearings 56,58 that fit within the hub bores 48,50. The spindle 62 is press fit into the pivot hole 54 for rotation with the upper jaw 40 . The spindle 62 has a central hole 64 into which a connecting rod 66 with a threaded end 68 is inserted. The end caps 70,72 are secured to the flanged bearings 56,58 by threaded fittings which are inserted into co-located holes on the flanged bearings 56,58. are threaded into co-located female holes on the hubs 44,46. A connecting rod nut 74 is threaded onto the threaded end 68 of the connecting rod 66 . A connecting rod nut 74 is secured to the end caps 70,72 by screwing a threaded connector into co-located female holes on the flanged bearings 56,58. As will be appreciated, the connecting rod 66 and connecting rod nut 74 prevent lateral movement of the hub bores 48, 50 against the lateral forces on the jaws during the shearing action.

As best seen in FIGS. 4 and 8, as disclosed in U.S. Pat. No. 7,216,575, there is provided a disk assembly 80 which stabilizes the jaws against lateral movement, and in conjunction therewith. By providing a corresponding wear plate or wear surface 82 (Fig. 17) on one or both sides of the adjacent upper jaw 40, the lateral direction of the upper jaw 40 during a shearing action until the upper jaw enters an elongated groove 96 in the lower jaw 42 (described below). It is also possible to suppress the movement to

5-11, the lower jaw 42 includes forwardly extending, laterally spaced, substantially parallel jaw members 90, 92 and laterally spaced forward ends of the jaw members 90 and 92. a cross member 94 spanned across the front end of the . The laterally spaced jaw members 90, 92 and cross member 94 combine to form an elongated groove 96 in which the upper jaw 40 is received during the shearing process (see FIGS. 3C and 4). As will be described in more detail below, the forwardly extending jaw member 90 is constructed to receive the insert of the shear blade and is hereinafter referred to as the blade side jaw member 90 . The other forwardly extending jaw member 92 serves to provide structural rigidity to the lower jaw and laterally limits the movement of the upper jaw during the shearing process as it enters the elongated groove 96. This is hereinafter referred to as the guide-side jaw member 92 .

As best seen in FIG. 10, inside the blade-side jaw member 90 is a shear blade mount 100 which comprises a pair of hardened steel shear blade inserts 110 (FIG. 7). and Fig. 8) can be inserted. An embodiment of a shear blade insert 110 is shown in FIG. Each set of shear blade inserts 110 has generally flat vertical wear surfaces 114, 116 and generally flat horizontal wear surfaces 118, 120. As shown in FIG. The straight sections of intersection of the vertical and horizontal wear surfaces form the cutting edges 122 of the four shear blades. The shear blade insert 110 has parallel slanted end surfaces 124, 126 to create a parallelogram shape that positions the shear blade insert 110 on the shear blade mount 100 in the correct position and orientation. Adjacent end faces are then loaded onto each other at downward angles (see FIGS. 7 and 8). Of course, since the inserts 110 of a set of shear blades are of identical parallelepiped shape, they can be arranged in the shear blade mount 100 in rotation with respect to each other and in use. All four shear blade edges 122 can be used even if the shear blade edges wear. The flat, vertical wear surfaces 114, 116 have counterbored holes 130 for threaded connectors 132 (preferably socket-headed hole bolts) that removably attach to the shear blade mount 100. A shear blade insert 110 is adapted to be mounted therein. A counterbore 130 allows the head of a threaded connector 132 to fit within the counterbore. The threaded end of the threaded connector 132 is threaded through a counterbored hole 130 and a hole 134 (FIG. 10) in the same position in the shear blade mount 100 and out of the blade side jaw member 90. It is secured by a nut 136 (FIGS. 5 and 9) that fits in a counterbore hole 138. FIG.

As best seen in FIG. 10, the inside of the blade side jaw member 90 also has a guide blade mount 200 which receives a guide blade insert 210 made of hardened steel. (This can be seen most clearly in Fig. 8). The embodiment of the guide blade insert 210 is best seen in FIG. The guide blade insert 210 has generally flat vertical wear surfaces 214 , 216 and generally flat horizontal wear surfaces 218 , 220 . The straight sections of intersection of the vertical and horizontal wear surfaces define the cutting edges 222 of the four shear blades. The guide blade insert 210 has parallel slanted end faces 224, 226 which create the shape of a parallelogram. The slanted end surfaces 224 , 226 of the guide blade insert 210 are angled with the slanted end surfaces 124 , 126 of the shear blade insert 110 to properly position the guide blade insert 210 on the guide blade mount 200 . , one of its end faces 224, 226 is adapted to load one of the end faces 124, 126 of the adjacent shear blade insert 110 (as viewed in FIG. 8). best understood). Of course, as the cutting edge of the shear blade wears during use, the parallelepiped shape of the guide blade insert 210 allows it to be rotated within the guide blade mount 200. (replaced with guide blade mount 300 on the guide side as described below), all four shear blade cutting edges 222 are enabled. The vertical wear surfaces 214 , 216 have internally threaded holes 230 drilled for threading a threaded connector 232 (eg, a bolt) to removably attach the guide blade insert 210 to the guide blade mount 200 . Install inside. The threaded end of the threaded connector 232 is threaded into a counterbored hole 234 (FIGS. 5 and 9) in the same position on the outside of the blade member 90 to provide a guide blade insert 210. It is screwed into a female threaded hole 230 drilled in.

As best seen in FIGS. 9 and 11, the guide side member 92 also has a guide blade mount 300 (FIG. 11) which is attached to the blade side guide blade mount 200. The inserting body 210 of the same guide blade as that to be inserted can be inserted, and the inserting body 210 of the guide blade is exchanged between the guide blade mounting base 300 on the guide side and the guide blade mounting base 200 on the blade side. make it possible. Accordingly, a counterbored hole 334 (FIGS. 7, 8, 8, 8, 9) provided a threaded connector 232 (e.g., bolt) in the same position on the outside of the guide side jaw member 92 as in the blade side guide blade mount 200. 10) and threaded into the hole 230 drilled in the guide blade insert 210, the guide blade insert 210 is also threaded onto the guide side using the same threaded connector. is fixed by being held by the guide blade mounting base 300 of .

As best seen in FIGS. 9 and 11, the cross member 94 has a side blade mount 400 (FIG. 11) which includes a side blade insert 410 (FIG. 11) made of hardened steel. 9) can be inserted. An embodiment of a side blade insert 410 is shown in FIG. Side blade insert 410 includes a generally flat front wear surface 414, generally flat upper and lower wear surfaces 418, 420, generally flat end surfaces 424, 426, and a back surface 428. do. Back surface 428 includes four equally spaced radially arranged female threaded holes 430 . The back surface 428 also mates with a protruding portion 432 to secure this portion within a recess 434 (FIG. 11) in the side blade mount 400 . The straight portions where the front vertical wear surface 414 meets the upper and lower wear surfaces 418, 420 and the end faces form the cutting edges 422 of the four cutting blades. The side blade insert 410 is preferably square with four radially spaced female threaded holes 430 so that the side blade insert can be positioned within the side blade mount 400. Since four 90 degree rotations are possible, all four cutting blade edges 422 are usable even if the shear blade edges wear during use. Sideknife insert 410 is secured within sideknife mount 400 by a threaded connector 434 (e.g., bolt, etc.) that engages a counterbored hole 438 in cross member 94 . (Figs. 5 and 7). The end of the threaded connector 434 is threaded into a female threaded hole 430 provided at the same location on the rear surface 428 of the side insert 410 .

The upper jaw 40 has a blade side and a guide side, corresponding to the blade side member 90 and the guide side member 92 of the adjacent lower jaw 42 . On the blade side of the upper jaw 40 is a shear blade mount 500 (FIG. 6) which is the same shear blade insert 110 (FIG. 5) used in the shear blade mount 100 of the lower jaw 42. It has a structure that can be inserted. This allows the shear blade insert 110 to be interchangeable between upper and lower jaws, thereby reducing the number of different blade configurations required for the shear attachment 10 . However, in the upper jaw, the insert 110 of the shear blade is oriented at the upper tip as opposed to the lower tip in the lower jaw (compare FIGS. 5 and 7). The shear blade insert 110 is secured to the upper jaw in substantially the same manner as to the lower jaw. The threaded end of the threaded connector 132 passes through the counterbore hole 130 and into the same position hole 534 in the upper shear blade mount 500 . This threaded end is further secured by a nut 136 which is received in a counterbore 538 (FIG. 7) on the guide side of the upper jaw 40 .

6, 10 and 17, the most forward or snout portion 601 of the upper jaw 40 has a snout mount 600 into which a hardened steel piercing tip insert 610 is inserted. (Figs. 5, 7, 17) and protects the maxillary snout base material from wear during use. The nose tip mounting base 600 includes a blade side nose tip mounting base 602 (FIGS. 6 and 17), a guide side nose tip mounting base 604 (FIG. 10) and a front nose tip mounting base 606 (FIGS. 6, 10, 10). 17), which result in a narrowed portion 608 at the tip of the nose. The forward-most nose tip 609 on nose mount 600 is preferably curved to minimize stress concentrations on nose tip portion 608 both during manufacturing and during use. can. The piercing tip insert 610 includes two halves 620, 622 which are substantially symmetrical to each other except for holes for connectors (described below) in each. The half that overlies the blade side of the snout is hereinafter referred to as the blade side half 620 . The half overlying the guide side of the nose is referred to below as the guide side half 622 .

FIG. 15 shows various views of an embodiment of the blade side half 620 . FIG. 16 shows similarly varied views of an embodiment of the guide-side half-part 622 . Each of the piercing tip halves 620 , 622 has an outer wall 630 with a substantially flat vertical wear surface 632 and a substantially flat vertical inner wear surface 634 . The halves 620 , 622 also have a laterally inwardly projecting front wall 636 with an outer curved wear surface 638 and an inwardly facing bearing surface 640 . Each of the piercing tip halves 620, 622 also has a laterally inwardly projecting bottom edge 642 with a flat lower wear surface 644 and a support surface 646 on the upper edge. Each piercing tip half 620, 622 also has an end bearing surface 648 and a ridge 650 having an upper ridge bearing surface 651 and a lower ridge bearing surface. 653. The ridge 650 can also have a curved outer edge to reduce stress concentrations. Lower ridge bearing surface 653 extends behind end bearing surface 648, the purpose of which will be described later in connection with FIGS. The straight line segment where the flat vertical wear surface 632 and the lower flat wear surface 644 meet forms the cutting edge 652 of the shear blade. The straight portion of the intersection of the curved wear surface 638 on the front wall 636 and the lower flat wear surface 644 forms the front piercing tip cutting edge 654 . (The piercing tip on the front may be chamfered.)

As best seen in FIGS. 6, 10 and 17, the snout mounts 602, 604, 606 are formed with a peripheral edge support surface 656 which extends over half of the piercing tip. The outer edges of the parts 620, 622 are received in complementary fashion. It should be appreciated that the width between the inwardly facing surface 640 of the front wall 636 projecting laterally inwardly from each of the piercing tip halves 620, 622 and the upwardly facing surface 646 of the lower side 642 projecting laterally inwardly is Approximately half of the narrowed nose portion 608 provides inward support of the side walls 630 on the piercing tip halves 620 , 622 when the piercing tip halves 620 , 622 are attached to the nose mount 600 . The surface 640 and the support surface 646 on the upward side of the bottom portion 642 correspond to the support surfaces of the blade side nose mount 602, the guide side nose mount 604, and the front nose mount 606, respectively. make contact. In addition, upper ridge bearing surface 651 and lower ridge bearing surface 653 on tip halves 620 , 622 contact against peripheral edge bearing surface 656 on nose mount 600 . On the blade side of the snout 601 , one of the beveled end surfaces 124 , 126 (depending on orientation) on the insert 110 of the upper shear blade abuts the trailing support surface 648 on the blade side half 620 . , contact against this support surface 648 . The piercing tip blade-side half 620 is therefore provided with an upper raised support surface 651 and a lower raised support surface 656 on the blade insert 110 and the peripheral end support surface 656 of the blade-side tip mount. Outward rotation (discussed below) is restrained both by the raised support surface 653 and the inset. The piercing tip half part 622 on the guide side is formed by fitting the upper ridge support surface 651 and the lower ridge support surface 653 to the support surface 656 at the end of the peripheral edge of the mount 604 on the nose tip of the guide side. movement is suppressed.

Not surprisingly, when the piercing tip halves 620, 622 are attached to the nose mount 600, the narrowed nose portion 608 is completely surrounded by the hardened steel piercing tip insert 610. , the base material of the nose tip 601 is protected from wear during use.

In addition to restricting rotation at the peripheral edge support surface 656 , the opposite halves 620 , 622 of the penetrating tip are secured to the narrowed nose portion 608 using threaded connectors 670 . In a preferred embodiment, the threaded connector is a socket headed bolt. The outer wall 632 of each half 620, 622 has an aligned hole 660 therethrough. The narrowed nose portion 608 is similarly provided with aligned holes 664 therethrough. A concentric counterbore 668 is provided at the top of the hole 660 in the outer wall 632 of the blade side half 620 . A hole 660 aligned with the outer wall 632 of the guide half 622 is internally threaded. A counterbore 668 allows the head of a threaded connector 670 to fit within the counterbore 668 . The threaded end of the threaded connector 670 is threaded into the narrowed nose portion 608 through a hole 660 in the blade half 620 and aligned with the guide tip half 622 . It is screwed into the female threaded hole 660 . Of course, the counterbores 668 and tapped holes 660 in the halves 620, 622 on either side of the tip can be interchanged if desired. Alternatively, rather than drilling holes 660 in one of the tip halves, the outer walls 632 of both halves 620, 622 are provided with counterbore 668 for receiving the head of the threaded connector 670 and the opposite side. It is also possible to receive a nut (not shown) on the tip half of the. 18 and 22, holes 660, 664 are positioned along arcs concentric with the leading end of piercing tip 610 (i.e., outer curved wear surface 638) and are threaded. to ensure that the load on the connector 670 is more uniform.

It will be appreciated that when attached to the upper jaw 40, the flat, vertical wear surfaces 114, 116 (depending on orientation) of the shear blade insert 110 are aligned with the vertical wear surfaces 632 on the blade-side tip halves 620. , and the shear blade cutting edges 122, 652 on the shear blade insert 110 and the puncture tip insert 610 are substantially aligned. Similarly, on the mandible 42, the flat vertical wear surfaces 114, 116 (depending on orientation) of the shear blade insert 110 are similar to the vertical wear surfaces 214 on the blade side guide blade insert 210. They are substantially coplanar, and the cutting edges 122, 222 of each shear blade are substantially aligned. It should also be appreciated that substantially coplanar vertical wear surfaces 114, 116, 632 on the upper shear blade insert and the piercing tip insert 610 and the cutting edge of the shear blade. 122, 652 are slightly laterally inwardly offset (approximately 0.01 and 0.05 inches is preferred) so that as the upper jaw moves through its range of motion and enters the elongated groove 96 in the lower jaw 42, the cutting edges of the upper shear blades pass the cutting edges of the shear blades in the lower jaw. It's like Similarly, the cutting edge 652 of the shear blade on the guide-side half 622 of the piercing tip is offset laterally inward (approximately 0.5 mm) from the cutting edge 222 on the guide-side guide blade insert 210 . A range between 0.01 inch and 0.05 inch is preferred). Thus, the width of the piercing tip insert 610 is less than the distance between the cutting edges 222 of the shearing blades on the blade side and guide blades 210 (between about 0.02 and 0.1 inches). range is preferred), and when the upper jaw closes into the elongated groove 96 of the lower jaw 42, the piercing tip insert 610 is allowed to pass between the opposite guide blades 210 on the underside. Padding may be provided between the various inserts 110, 210, 610 and each mount 100, 200, 300, 500, 600 to maintain close tolerances between the cutting edges of each shear blade.

FIGS. 18-22 are enlarged side views of the jaws 40, 42 showing the insertion of the blade inserts 110, 210, the stabbing tip insert 610, and the side blade inserts during movement of the upper jaw. The relationship with the body 410 is shown more clearly. That is, from a fully open position (FIG. 18) to a fully closed position (FIG. 21) reaching all the way into the elongated groove 96 of the mandible 42 . FIG. 19 illustrates the upper jaw half-closed, with the front piercing tip cutting edge 654 on the piercing tip insert 610 perpendicular or at right angles to the ground. FIG. 20 shows the upper jaw with the cutting edge 654 of the anterior piercing tip positioned across the lower jaw 42 .

A snout wear stop 700 is secured (such as by welding) over the piercing tip insert 610 in the snout portion 601 of the maxillary 40 to protect the maxillary base material from wear during use. When the nose tip wear stop 700 is worn out, it can be removed and replaced with another nose tip wear stop 700 . The wear stop 700 can be made from the same material as the base material, or it can be made from hardened steel. Referring to FIG. 20, the nose tip wear stop is preferably of sufficient length along the nose tip to ensure that the upper jaw 40 is at least fully recessed into the lower jaw 42 to protect the base material of the nose tip. As another example, the piercing tip insert 610 can extend along the snout portion 601 the full length of the depth at which the upper jaw extends into the lower jaw. In such an embodiment, the nose mount 600 would be elongated as well, requiring an additional hole 660 to properly press the lengthened piercing tip insert 610 against the narrowed nose portion 608 . Sometimes.

Not surprisingly, the base material of the nose portion 601 overlying the piercing tip insert 610 is more susceptible to wear than the piercing tip insert 610 made of hardened steel. Thus, without the wear stop 700, the nose portion 601 may wear down to a point where the upper edge of the piercing tip insert 610 protrudes beyond the nose portion. If the upper edge of the piercing tip insert 610 protrudes outwardly from the snout portion 601, the protrusion can catch material in the jaw when the upper jaw reopens, ie when the upper jaw is pulled out from the lower jaw. . If sufficient withdrawal force is applied to the upper jaw, the piercing tip insert may be pulled away from the snout by the trapped material, shearing the threaded connector or breaking the piercing tip insert in the process. there's a possibility that. Therefore, as described below, when the wear stopper 700 is not attached to the nose tip portion 601, or the wear stopper itself wears away, the base material of the nose tip portion cannot be protected by the wear stopper any more. It is made to minimize the risk of snagging even in cases.

Figures 18 and 21 show a preferred construction of nose portion 601 designed to prevent or minimize the occurrence of snagging. The phantom line indicated by reference number 800 refers to the arc described by the most forward of the anterior piercing tip cutting edge 654 on the piercing tip insert 610 as the upper jaw moves through its full range of motion. there is Arc 800 is an arc of radius R 1 with respect to the central axis of jaw pivot axis 60 . The furthest point of the snout portion 601 from the cutting edge 654 of the front stabbing tip at the stabbing tip 610 to the end of the snout portion wear stop 700, or from the cutting edge to the snout position corresponding to the maximum depth that the snout portion 601 penetrates. The outer surface is configured to depart from the cutting edge arc 800 of the front piercing tip at a substantially smooth snout arc 802 . The nose tip arc 802 is an arc with a radius R2 that is smaller than the radius R1, and is the radial distance from the central axis of the jaw pivot axis 60 to a position along the nose tip portion 601, i.e., from the central axis to the nose tip arc 802. becomes progressively smaller compared to the cutting edge arc 800 of the front piercing tip. Stated another way, from the cutting edge 654 of the front piercing tip along the nose portion 601, i.e., from the cutting edge 654 along the nose portion arc 802, the cutting edge arc 800 of the front piercing tip and the nose portion gradually increases in distance from the arc 802 . This structure allows the nose tip portion 601 to come into contact with the cutting edge 654 on the front surface of the piercing tip, thereby preventing or suppressing the tip of the nose 601 from rubbing against the object pierced by the piercing tip 610, thereby preventing or suppressing the tip of the nose. wear can be minimized. Furthermore, since the nose tip portion is gradually away from the arc 800 of the cutting edge of the piercing tip, the base material of the nose tip portion is worn away, and the upper edge of the insert 610 of the piercing tip is outward from the worn base material of the nose tip portion. Even when it reaches the point where it protrudes, there is less chance of the cutting material getting caught in the jaws.

In addition, the piercing tip mount 600 and piercing tip insert 610 prevent the piercing tip from becoming stuck if the protruding end of the piercing tip becomes stuck or if the upper jaw becomes jammed with cutting material caught in the jaws. made to hold securely. For example, the hatched area 900 in FIG. 22 is intended to represent the cutting material that is caught or stuck between the worn surface of the insert 610 of the piercing tip and the insert 210 of the guide blade. However, this would cause the upper jaw to become stuck in the narrow groove 96 of the lower jaw 42, making it impossible to withdraw or reopen the upper jaw 40. The upper jaw 40 withdrawal force F (the force exerted by the hydraulic actuator 30 pulling on the upper jaw) is perpendicular to a radial line 806 drawn from the central axis of the jaw pivot axis 60 to the midpoint of the captured cut material 900. , and try to pull the insert 610 at the piercing tip in the direction of . Therefore, it should be appreciated that any bearing surface that is less than 90° to the straight line 806 will limit the pull-out force F. Thus, the ridge 650 projecting rearwardly from the insert 610 of the piercing tip ensures that the bearing surface provides the withdrawal force F. FIG.

Referring to FIG. 22, the lower ridge support surface 653 forms an angle less than 90° with the radial straight line 806 so that the support surface 656 at the peripheral end of the nose mount 600 is subject to the pull-out force F. is engaged so as to suppress Similarly, the inwardly facing support surface 640 of the front wall 636 loads the nose mount 606 as indicated by arrow R and resists the pull-out force F. Therefore, by reducing the shear force exerted by the withdrawal force F or the reaction force R on the connector 670, the piercing tip insert 610 may be pulled out of the nose portion or otherwise cracked. can be prevented or minimized.

In addition, the hole 660 in the piercing tip insert 610 is aligned along an arc 804 that has a radius R3 that is smaller than the radius R2 and is concentric with the nose arc 802, resulting in a more uniform loading across the connector 670. is added, which further reduces the shear stress on any one of the connectors or causes a stress concentration that can cut the connector or fracture the insert at the piercing tip.

FIG. 23 shows another example, and the hatched area 902 is meant to represent the cut material sandwiched between the insert 610 of the piercing tip and the insert 410 of the side blade. . In this example, the pull-out force F is again relative to a radial line 806 extending from the center axis of the jaw pivot axis 60 to the center point of the clamped material (which in this example is assumed to be at the cutting edge 654 of the front piercing tip). Poke vertically and pull the tip. When subjected to a withdrawal force F, the piercing tip insert 610 tends to rotate outward as indicated by arrow 810 and to be dislodged from the nose tip portion 601 . However, as shown by reaction force R, the upper ridge support surface 651 engages a peripheral edge support surface 656 on the nose mount 600 to move the piercing tip insert 610 outwardly. To reduce this, the shear forces on the connector 670 can be reduced to prevent or reduce stress fracture of the puncture tip insert 610 .

FIG. 24 shows that the unlikely occurrence of snuff portion 601 abrading away to produce a protruding portion that catches material as described above occurs, and pull-out force F is applied to the upper edge of insert 610 of the piercing tip. It shows a working example. Considering that the distance between the arc 802 of the nose tip and the arc 800 of the cutting edge of the front piercing tip gradually increases for the reasons explained above, such a thing is likely to occur. Nor. However, if the nose tip were to wear down and produce a protruding portion where material could get caught, the upper ridge support surface 651 would not be able to withstand the perimeter edge of the nose mount 600 as shown by the reaction force R. to resist the pull-out force F tending to move the cutting edge of the puncturing tip outward as indicated by arrow 810, thereby reducing the shear forces on connector 670 and the difference in the puncturing tip. Fragmentation of the insert 610 under stress can be prevented or reduced.

The foregoing description is provided to enable any person skilled in the art to make or use the invention and is provided in the context of the patent application and its requirements. Various modifications of the described embodiments, as well as the general principles and features of the described embodiments, will be readily apparent to those skilled in the art. Accordingly, it is intended that the present invention not be limited to the embodiments described herein and illustrated in the drawings, but is to be construed in its broadest scope consistent with the spirit and scope of the appended claims.

Claims (12)

A blade set for a demolition shear having an upper jaw and a lower jaw, comprising:
the upper jaw having a blade side, a guide side and a snout at the front end of the upper jaw ;
the blade set comprising a first upper shearing blade and a piercing tip;
a first upper shearing blade adapted to be attached to the blade side of the upper jaw and having a first shearing edge, a leading end bearing surface and a trailing end bearing surface;
The stabbing tip is
having a blade side sidewall with a flat outer wear surface and a trailing edge bearing surface ;
having a guide-side sidewall with a flat outer wear surface;
It has a front wall with an anterior outer wear surface, the anterior outer wear surface of the anterior wall intersecting the planar outer wear surface of the blade side wall and the planar outer wear surface of the guide side wall. and extends laterally between the planar outer wear surface of the blade-side sidewall and the planar outer wear surface of the guide-side sidewall;
a bottom wall having a lower wear surface, the lower wear surface intersecting the flat outer wear surface of the blade-side sidewall and the flat outer wear surface of the guide-side sidewall; extending laterally between the flat outer wear surface of the side wall and the flat outer wear surface of the side wall on the guide side, the lower wear surface intersecting the forward outer wear surface of the front wall;
The intersection of the outer wear surface and the lower wear surface of the front wall forms the cutting edge of the piercing tip,
Thereby, when the piercing tip is attached to the nose tip of the upper jaw of the shearing machine for demolition, the nose tip is moved along the blade side of the nose tip by the side wall on the blade side and on the guide side of the nose tip by the side wall on the guide side. and along the bottom side of the nose tip by the bottom wall and along the front side of the nose tip by the anterior wall, completely surrounded and protected by the piercing tip , the first upper shearing edge extending from the upper jaw. A blade set characterized in that, when mounted on the blade side, the support surface at the front end of the first upper shearing blade is adjacent to the support surface at the rear end of the blade side sidewall of the piercing tip . 2. The blade set of claim 1, wherein the piercing tip defines a plurality of holes for connectors through the side wall on the blade side and a plurality of holes for the connector through the side wall on the guide side. and a plurality of holes for the connectors are adapted to receive threaded connectors for securing the piercing tip to the snout of the upper jaw of the demolition shears. 3. The blade set of claim 1 or 2, wherein the piercing tip comprises a first piercing tip and a second piercing tip, the first piercing tip comprising a blade side sidewall, and a second the piercing tip includes a guide-side sidewall, and at least one of the first piercing tip and the second piercing tip includes at least a portion of the front wall and at least a portion of the bottom wall. Characterized blade set. 4. The blade set of claim 3, wherein the first piercing tip includes a blade side sidewall, a front wall half and a bottom wall half, and a second piercing tip includes a guide side. a side wall, half a front wall, and half a bottom wall. A blade set according to any one of claims 1 to 4, wherein the blade-side sidewall of the piercing tip includes a ridge extending rearwardly from the support surface at the rear end of the blade-side sidewall, and the guide-side sidewall is provided with a ridge extending rearwardly from the support surface at the rear end of the side wall of the guide side. 6. The blade set of claim 5, wherein the blade-side sidewall ridge and the guide-side sidewall ridge each include an upper ridge support surface. 6. The blade set of claim 5, wherein the blade-side sidewall ridge and the guide-side sidewall ridge each include a lower ridge support surface. 8. A blade set according to claim 7, wherein at least a portion of the lower raised support surface of the blade side wall extends rearwardly at an angle to the support surface of the trailing edge of the blade side wall. and at least a portion of the lower raised support surface of the guide side wall extends rearwardly at an angle to the support surface at the rear end of the guide side wall. A set of blades. A blade set according to any one of claims 1 to 8, wherein a second upper side located behind the first upper jaw shearing blade and adapted to be attached to the upper jaw of the demolition shearer further comprising a shearing blade such that when the second upper shearing blade is attached to the upper jaw, the supporting surface at the forward end of the second upper shearing blade is the supporting surface at the rearward end of the first upper shearing blade; A blade set characterized by being adjacent to the 10. The blade set of claim 9 , further comprising a lower shearing blade adapted to be attached to the lower jaw of a demolition shearer. 11. The blade set of claim 10 , further comprising a guide blade adapted to be attached to the mandible of the demolition shears. 12. The blade set of claim 11 , further comprising side blades adapted to be attached to the lower jaw of a demolition shear.

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