JP4832372B2 - Retractable work tool - Google Patents

Description

  The present invention accommodates and attaches a single rod type hydraulic cylinder in a frame having left and right side plates that are combined at intervals, and is a pair of gripping, cutting, or crushing attached to the frame so as to be openable and closable. An open / close working tool that opens and closes the working open / close body by the hydraulic cylinder, and more specifically, a gripping tool such as a fork grapple attached to an arm of a working machine, a crushing tool, and a cutting tool. About.

  A single rod type hydraulic cylinder is housed and mounted in a frame having left and right side plates combined at intervals, and a pair of opening and closing operations for gripping, cutting, crushing, etc., which are attached to the frame so as to be opened and closed. In an open / close type work implement having a body, generally, a boss portion having a pin hole penetrating the bottom end portion of the hydraulic cylinder is provided, and the left and right side plates of the frame are provided in the pin hole of the boss portion. One pin is inserted through the provided pin hole and the bottom end of the hydraulic cylinder is attached to the frame (see, for example, Patent Document 1).

  Further, as another example of a conventional open / close type working tool, there is one that employs a trunnion type hydraulic cylinder mounting structure that pivotally supports a middle portion of a tube of the hydraulic cylinder (see, for example, Patent Document 2).

JP 2006-335488 A JP-A-2-35171

  As shown in FIG. 8, in an open / close type work tool having a structure in which a pin is inserted into a pin hole of a boss portion at the bottom side end portion and a hydraulic cylinder is attached to a frame, as shown in FIG. A block portion 60 having an oil passage 61 communicating with the bottom chamber 64 is provided at the bottom side end portion (65 is a piston, 66 is a piston rod), and the boss portion further having a pin hole 62a from the block portion 60 Since it is necessary to project 62 as indicated by the symbol L in the axial direction of the hydraulic cylinder 63, the length of the hydraulic cylinder 63 becomes longer. For this reason, the frame which accommodates the hydraulic cylinder 63 becomes large. In addition, when the frame becomes large, obstacles around the work environment in the work and interference parts between the work object and the frame increase, and the frame is likely to be damaged. In addition, since the weight of the frame increases, the stability of the work implement when the work implement is attached to the arm of the work implement is lowered, and the work capability of gripping, crushing, cutting, etc. of the work implement is reduced. .

  On the other hand, as described in Patent Document 2, in the trunnion type in which the middle part of the tube of the hydraulic cylinder is supported by a frame, the hydraulic cylinder rotates when the working opening / closing body is opened and closed by expansion and contraction of the hydraulic cylinder. However, since the bottom side end portion swings up and down greatly, it is necessary to provide a space for allowing the swing in the frame. For this reason, the size of a frame becomes large like the work implement of patent documents 1, and the above-mentioned problem arises in connection with this.

  In view of the above problems, the present invention can reduce the size of the work tool frame, thereby reducing the weight of the work tool, preventing damage to the frame, improving the stability of the work machine, work ability, workability, etc. It is an object of the present invention to provide an open / close type working tool having a configuration that can provide an effect.

The open / close type work tool of claim 1 is accommodated in a frame having left and right side plates that are combined at an interval and accommodated in a single rod type hydraulic cylinder, and is attached to the frame so as to be openable and closable by expansion and contraction of the hydraulic cylinder. In an openable working tool that opens and closes a pair of working opening and closing bodies,
Non-penetrating pin holes provided in the bosses provided at the bottom end of the hydraulic cylinder so as to be located on the same axis from the left and right ends,
It is a non-penetrating portion between the left and right pin holes in the boss portion, and is provided so that a part thereof intersects with a virtual extension portion connecting the two pin holes, and hydraulic oil is supplied to the bottom chamber of the hydraulic cylinder. An oil passage to supply,
The left and right side plates are respectively inserted into pin holes and left and right pin holes of the boss portion, and left and right pins for attaching bottom end portions of the hydraulic cylinders to the frame.

The openable work tool according to claim 2 is the openable work tool according to claim 1,
The boss portion is provided so as to protrude in the outer peripheral direction of the hydraulic cylinder so that the axial width of the pin hole of the boss portion is close to the interval between the left and right side plates.

The openable work tool according to claim 3 is the openable work tool according to claim 1 or 2,
The upper and lower corner portions of the boss portion are chamfered.

  According to the first aspect of the present invention, the pin hole provided in the boss portion of the hydraulic cylinder is a non-penetrating pin hole provided from the left and right end portions, and the oil passage communicating with the bottom chamber is formed in the portion between the pin holes in the boss portion. Since the structure is adopted, the bottom chamber side end, that is, the length of the boss in the axial direction can be shortened, and as a result, the frame can be reduced in size. For this reason, effects such as reduction of the weight of the hydraulic cylinder and the work tool, prevention of damage to the frame during work due to downsizing of the frame, improvement of stability of the work machine, work ability, workability, and the like can be obtained.

  According to the second aspect of the present invention, since the boss portion projects in the outer peripheral direction of the hydraulic cylinder, the width in the axial direction of the boss portion is set to a width close to the interval between the left and right side plates of the frame. The portion serves as a support for the frame, and the strength of the frame can be increased.

  According to the invention of claim 3, since the upper and lower corner parts of the boss part are chamfered, the hydraulic cylinder and its necessary accommodation space can be narrowed, so that the effect of claim 1 is further promoted.

  FIG. 1 and FIG. 2 are a side view and a rear view, respectively, showing an embodiment of a working tool of the present invention attached to a working arm of a working machine. Reference numeral 1 denotes a working arm of a working machine such as a hydraulic excavator. Reference numeral 2 denotes a working tool in which a bracket 8 is rotatably attached to the tip of the working arm 1 around a pin 3. A hydraulic cylinder 4 is attached to the work arm 1 to rotate the work tool 2. The tip of the hydraulic cylinder 4 is connected by a pin 7 to the other end of a link 6 having one end attached to the working arm 1 by a pin 5. The tip of the hydraulic cylinder 4 is connected by the pin 7 to the other end of the link 10 whose one end is connected to the bracket 8 of the work tool 2 by the pin 9.

  A frame 13 of the work tool 2 is attached to the lower part of the bracket 8 via a turning device 12. As shown in FIG. 3, the turning device 12 includes a turning motor 15 attached to a disk 8a below the bracket 8, an internal gear 17 attached to the lower surface of the disk 8a via a bearing 16 so as to be capable of turning, A pinion 18 attached to the output shaft of the turning motor 15 and meshing with the internal gear 17 is provided. The top plate 13 a of the frame 13 is attached to the internal gear 17 that is a swirled body by a bolt 19. A center joint 28 for supplying hydraulic oil to a hydraulic cylinder 22 that opens and closes the working opening / closing bodies 20 and 21 is attached to the center of the disk 8a.

  The frame 13 includes the top plate 13a attached to the internal gear 17, the left and right side plates 13b and 13c, and a winding plate 13d that covers a part of the opening surface at the end between the side plates 13b and 13c. This winding plate 13 is effective in improving the strength of the frame 13 and preventing the end of the frame 13 from being damaged.

  The work tool 2 of the present embodiment constitutes a fork grapple, and the work opening / closing bodies 20 and 21 are attached so as to be openable and closable around pivoting shafts 23 and 24. The work opening / closing bodies 20 and 21 are connected by an interlocking link 25 and pins 26 and 27.

  The hydraulic cylinder 22 for opening and closing the working opening / closing bodies 20 and 21 has a bottom side end connected to the side plates 13b and 13c of the frame 13 by pins 30 and 31, and a boss portion 32 at the tip of the piston rod 29 which is the other end. The pin 33 is connected to one working opening / closing body 20. Accordingly, when the hydraulic cylinder 22 expands and contracts, one work opening / closing body 20 rotates around the pivot shaft 23 and the other work opening / closing body 21 connected to the work opening / closing body 20 by the interlocking link 25. Also rotate in conjunction with each other to perform an opening / closing operation, and the object to be grasped is grasped and released.

  4 is a half sectional side view of the hydraulic cylinder 22, FIG. 5 is a view of the hydraulic cylinder 22 as viewed from the bottom end, and FIG. 6 is a view of the hydraulic cylinder 22 as viewed from the front end side of the piston rod 29. FIG. 3 is a cross-sectional view showing a connection structure of the bottom end portion of the hydraulic cylinder 22 to the frame 13.

  In FIG. 4, 34 is a piston provided in the tube 35 of the hydraulic cylinder 22, 36 is a bottom chamber, and 37 is a boss provided at the bottom side end of the hydraulic cylinder 22. The boss portion 37 is provided with non-penetrating pin holes 38 and 39 so as to be located on the same axis from the left and right end portions. 40 is an oil passage provided in the boss portion 37, and this oil passage 40 communicates the hydraulic oil supply pipe 41 to the bottom chamber attached to the tube 35 to the bottom chamber 36 (FIGS. 3 to 3). 6). The oil passage 40 is provided so that a part thereof intersects with a virtual extension portion of the pin holes 38 and 39 in a non-penetrating portion between the left and right pin holes 38 and 39. That is, the end of the pin holes 38 and 39 on the bottom chamber 36 side is located closer to the bottom chamber 36 than the end of the oil passage 40 opposite to the bottom chamber 36.

  As shown in FIG. 7, one or more (two in this example) reinforcing plates 42 and 43 are welded to the insertion portions of the pins 30 and 31 of the side plates 13b and 13c for reinforcement, and these reinforcing plates 42 are provided. , 43 are provided with pin holes 44, 45 in the side plates 13b, 13c, respectively, and a screw hole 46 is provided in the vicinity of the pin holes 44, 45.

  When the pins 30 and 31 are attached, the positions of the pin holes 38 and 39 of the boss portion 37 are aligned with the positions of the pin holes 44 and 45 of the side plates 13a and 13b, and the pin holes 44 and 45 of the side plates 13a and 13b are aligned. The pins 30 and 31 are inserted through the pin holes 38 and 39, respectively, and the pins 30 and 31 are inserted through the pin holes 38 and 39 of the boss portion 37, respectively. A mounting screw 49 is inserted into the hole 48 of the mounting piece 47 welded to each of the pins 30 and 31, and the mounting screw 49 is screwed into the screw hole 46 and fastened, whereby the bottom end of the hydraulic cylinder 22 is attached to the frame 13. Install to. In this example, the reinforcing plates 42 and 43 are welded to the mounting portions of the pins 30 and 31 of the side plates 13b and 13c to increase the thickness of the mounting portions by the pins 30 and 31 of the side plates 13b and 13c. The strength of the frame 13 is improved, and play of the pins 30 and 31 can be prevented.

  Reference numeral 50 denotes a tube-attached pipe (see FIGS. 3 to 6) for supplying hydraulic oil to the rod chamber of the hydraulic cylinder 22. As shown in FIG. 3, the pipe 41 communicated with the bottom chamber 36 and the pipe 50 communicated with the rod chamber are connected to a center joint 28 provided in the swivel device 12 via pipes 52, 53 made of hoses, respectively. . These connecting pipes 52 and 53 are arranged through an opening 54 provided in the top plate 13 a of the frame 13. Reference numeral 55 denotes a grease supply port for supplying grease to the sliding surface between the pins 30 and 31 and the pin holes 44 and 45 provided in the boss portion 37. Reference numeral 56 denotes a grease supply port for supplying grease to the sliding surface between the boss portion 32 at the tip of the piston rod and the pin 33.

  An opening 57 (see FIG. 3) is provided in a portion of the winding plate 13d of the frame 13 that faces the boss portion 37 of the hydraulic cylinder 22. The opening 57 is for supplying oil from the greasing port 55 and for inserting and removing a position adjusting shim 59 (see FIG. 7) to be inserted between the side plates 13b and 13c and the boss portion 37. By providing the opening 57, the position adjustment by the shim 59 of the hydraulic cylinder 22 and the maintenance work such as the greasing work are facilitated, and the maintainability is improved.

  As shown in FIG. 7, in the present embodiment, the axial center width W1 of the pin holes 38, 39 of the boss portion 37 is close to the interval W2 between the left and right side plates 13b, 13c. The hydraulic cylinder 22 is provided so as to protrude in the outer peripheral direction. The pipes 41 and 50 attached to the hydraulic cylinder 22 are disposed so as to fit between the left and right side plates 13b and 13c. Further, chamfers 37a and 37b are applied to upper and lower corner portions of the boss portion 37 in order to prevent the boss portion 37 from interfering with the top plate 13a and the winding plate 13d of the frame 13 as the hydraulic cylinder 22 expands and contracts. ing.

  As described above, the work tool 2 of the present embodiment has the pin holes 38 and 39 provided in the boss portion 37 of the hydraulic cylinder 22 as non-penetrating pin holes provided from the left and right end portions, and the pin holes 38 and 39 in the boss portion 37 are provided. Since the oil passage 40 communicating with the bottom chamber 36 is formed in the portion between 39, the length of the boss portion 37 in the axial center direction can be shortened, and as a result, the size of the frame 13 can be reduced. For this reason, the weight of the hydraulic cylinder 22 and the work tool 2 is reduced, the frame 13 is prevented from being damaged by downsizing the frame 13, the stability of the work machine to which the work tool 2 is attached, the work ability, the workability, etc. are improved. The effect is obtained.

  In the present embodiment, the boss portion 37 projects in the outer peripheral direction of the hydraulic cylinder 22 so that the axial width W1 is set to be close to the interval W2 between the left and right side plates 13b, 13c of the frame 13. Therefore, the boss portion 37 serves as a support for the frame 13 and the strength of the frame 13 can be increased.

  Further, since the chamfers 37a and 37b are provided at the upper and lower corner portions of the boss portion 37, the hydraulic cylinder 22 and its necessary accommodation space can be reduced, and the frame 13 can be reduced in size and the weight of the work tool accompanying this reduction in size. The effect of reducing the damage, preventing the frame from being damaged during the work, improving the stability of the work machine, the work ability, and the workability can be promoted.

  The present invention is not limited to the case where the work opening / closing body is a gripping tool such as a fork grapple that constitutes the gripping part, but the work opening / closing bodies 20, 21 are used to The present invention can also be applied to a crushing tool to be crushed or a working tool that also has these functions.

1 is a side view showing a working tool according to an embodiment of the present invention attached to an arm of a working machine. It is a rear view of FIG. It is a partial expanded sectional view of the working tool of this Embodiment. It is a half cross-sectional side view of the hydraulic cylinder for opening and closing a working opening-closing body of this Embodiment. It is the figure which looked at the hydraulic cylinder of this Embodiment from the bottom side end part. It is the figure which looked at the hydraulic cylinder of this Embodiment from the piston rod side edge part. It is sectional drawing which shows the attachment structure with respect to the flame | frame of the bottom side edge part of the hydraulic cylinder of this Embodiment. It is a figure which shows the structure of the bottom side edge part of the conventional hydraulic cylinder.

Explanation of symbols

1: working arm, 2: working tool, 3: pin, 4: hydraulic cylinder, 5, 7, 9: pin, 6, 10: link, 12: turning device, 13: frame, 13a: top plate, 13b, 13c: Side plate, 13d: Winding plate, 15: Swivel motor, 16: Bearing, 17: Internal gear, 18: Pinion, 19: Bolt, 20, 21: Open / close body for work, 22: Hydraulic cylinder, 23: Center joint , 23, 24: Pivoting shaft, 25: Link for linkage, 26, 27: Pin, 28: Center joint, 29: Piston rod, 30, 31: Pin, 32: Boss part, 33: Pin, 34: Piston, 35: tube, 36: bottom chamber, 37: boss part, 37a, 37b: chamfer, 38, 39: pin hole, 40: oil passage, 41, 50: piping for supplying hydraulic oil, 42, 43: reinforcing plate, 44 45: Pin hole, 4 : Screw hole, 47: mounting piece 48: hole, 49: mounting screw, 52, 53: pipe, 54: opening, 55: Kyuaburaguchi, 57: opening, 59: Shim

Claims (3)

A single-rod hydraulic cylinder is housed and mounted in a frame having left and right side plates that are combined at intervals, and a pair of working opening / closing bodies that can be opened and closed is opened and closed by expansion and contraction of the hydraulic cylinder. In an openable work implement that
Non-penetrating pin holes provided in the bosses provided at the bottom end of the hydraulic cylinder so as to be located on the same axis from the left and right ends,
It is a non-penetrating portion between the left and right pin holes in the boss portion, and is provided so that a part thereof intersects with a virtual extension portion connecting the two pin holes, and hydraulic oil is supplied to the bottom chamber of the hydraulic cylinder. An oil passage to supply,
Opening and closing work characterized by comprising: left and right pins that are respectively inserted into pin holes provided in the left and right side plates and left and right pin holes of the boss portion, and that attach the bottom side end of the hydraulic cylinder to the frame. Ingredients. The openable work tool according to claim 1,
The boss portion is provided so as to protrude in the outer peripheral direction of the hydraulic cylinder so that the axial width of the pin hole of the boss portion is close to the interval between the left and right side plates. Work tool. The openable work tool according to claim 1 or 2,
An openable working tool characterized in that chamfering is performed on upper and lower corner portions of the boss portion.

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