JPH0313376B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic clam shell bucket that is opened and closed by a hydraulic cylinder.

A conventional hydraulic clam shell bucket is constructed as shown in FIG. 1 or 2. 1st
The one shown has brackets 2a,
2b, and brackets 4a, 4b provided on the left and right shells 3a, 3b and the brackets 2a, 2b.
and links 5a and 5b, respectively, with both ends connected to the shaft 6.
The lower end of the rod 1a is rotatably connected to a block 9 which is interposed and connected by a, 7a and 6b, 7b, and whose both ends are connected between the brackets 4a, 4b by shafts 8a, 8b. If hydraulic oil is supplied to the chamber above the piston 1c of the hydraulic cylinder 1, the cylinder tube 1b will rise and the shells 3a and 3b will open, and if hydraulic oil is supplied to the chamber below the piston 1c, The structure is such that the cylinder tube 1b is lowered and the shells 3a, 3b are closed.

The one in Figure 2 is a single rod type hydraulic cylinder 1.
The vicinity of the upper end of the rod 10a of 0 is rotatably connected to the upper end of a frame 11 having grooves on both sides, and the cylinder tube 10b is mounted so as to be movable up and down within the frame 11.
Brackets 2a, 2b and shell 3 provided on both sides of
Brackets a and 3b are link 5 as above.
a, 5b and shafts 6a, 6b through 7a, 7b, and the brackets 2a, 2b are provided with guide rollers 12 that roll in contact with both sides of the frame 11.
a, 12b are provided, and the lower end of the frame 11 is connected to brackets 4a, 4b by shafts 8a, 8b, and by operating the hydraulic cylinder 10, the frame 11 is connected to the cylinder tube 10b.
moves up and down to open and close the bucket, and during this up and down movement, guide rollers 12a and 12b roll in contact with both sides of the frame 11 to guide the cylinder tube 10b.

Such a conventional clam shell bucket has a cylinder tube 1b of a cylinder for opening and closing the bucket,
10b is connected to the links 5a, 5b via the flanges 2a, 2b and the shafts 6a, 6b, so if there is a difference in the force acting on the links 5a, 5b, that force will be transferred to the cylinder tubes 1b, 10b and the cylinder rod. 1a, 10a, it is necessary to make the hydraulic cylinders 1, 10 large and heavy. In addition, cylinder tubes 1b, 10
Since the structure is to move b up and down, pinton 1c,
Since oil passages communicating with the upper and lower chambers of the cylinder rod 10c must be formed in the cylinder rods 1a and 10a, the hydraulic cylinder becomes large and heavy.
The price will be higher. In addition, in the case of clamshell buckets, opening the bucket faster during excavation (when closing the bucket) improves work efficiency and mud removal, but the first
In the case shown in the figure, the speed of the rod is the same when opening and closing the bucket, so the work efficiency is poor.

In view of the above points, it is an object of the present invention to provide a hydraulic clam shell bucket holster having a structure in which the weight of the hydraulic cylinder for opening and closing the bucket can be reduced, the formation of an oil passage is facilitated, and a reduction in price can be achieved. do.

In order to achieve this purpose, the hydraulic clam shell bucket of the present invention has a frame having openings on both left and right sides, longitudinal guide grooves on the front and rear surfaces, and pivot points for the left and right shells at the lower end. a single-rod hydraulic cylinder having a cylinder tube rotatably coupled to the upper end of the frame and mounted within the frame with the cylinder rod facing downward; A guide member moves up and down along the guide groove, and a lower end is pivoted to a shaft attached to the end of the cylinder rod, and the left and right ends of the upper part protrude from the left and right openings of the frame, and are used to open and close the left and right buckets. It is characterized by comprising a bracket connected via a link and a shaft, and a guide means for vertically moving the bracket along the frame while preventing the bracket from tilting in the left-right direction.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 6. Reference numeral 13 denotes a frame, and the frame includes a hydraulic cylinder mounting ring 14 integrally provided at the upper end of two plates 13a, 13b at the front and back with a gap between them, and a shaft 8 for mounting the shells 3a, 3b at the lower end.
By having a pivot part 15 pivoted by a and 8b, it has a structure with openings on both left and right sides,
Vertical guide grooves 16a, 16b are provided at the lower portions of the front and rear plates 13a, 13b. Reference numeral 17 denotes a hydraulic cylinder for opening and closing the bucket, and this hydraulic cylinder is a single-rod type, with the cylinder rod 17a facing downward, and a circular flange 17c provided at the top of the cylinder tube 17b.
is mounted on the stepped portion 14a in the hydraulic cylinder mounting ring 14, and the retaining ring 19 is fixed onto the ring 14 with the bolt 18, so that the cylinder tube 17b can be rotated freely and attached to the frame 13. It is installed to allow slight tilting. At the top of the hydraulic cylinder 17,
A hanging member 21 having a hole 20 connected to the tip of a machine arm or the like is integrally provided.

A boss 22 is provided at the lower end of the cylinder rod 17a.
is fixed, a shaft 23 is fitted to the boss 22,
The guide grooves 16a, 16b are provided at both ends of the shaft 23.
Guide rollers 24a and 24b are attached as guide members to move up and down along.

Reference numerals 25a and 25b are inverted triangular plate-shaped brackets whose lower ends are pivotally connected to the shaft 23, and both left and right ends of the upper ends of these brackets extend from the left and right openings of the frame 13, that is, between the plate members 13a and 13b. Shafts 26a and 26b are provided between the left and right protrusions so that their front and rear ends protrude from the protrusions, and each end of the shafts 26a and 26b is provided with a guide surface of the frame, that is, a plate. Member 13
Guide members 27a to 27d are slidably attached along both sides of the brackets a and 13b to prevent the bracket from tilting. The brackets 25a and 25b are connected to the shaft 26.
bucket opening/closing link 5a via a, 26b,
5b. 28a and 28b are rods that integrate the brackets 25a and 25b.

Reference numerals 29a and 29b are hydraulic oil supply and discharge pipes connected to the rod chamber and bottom chamber of the hydraulic cylinder 17, respectively.

In this bucket, when the hanging member 21 is connected to the arm of the working machine and pressurized oil is supplied to the bottom chamber of the hydraulic cylinder 27 from the supply/discharge pipe 29b, the cylinder rod 17a is pushed down and the shells 3a and 3b are Rotates in the closing direction around shafts 8a and 8b. On the other hand, if pressure oil is supplied from the supply/discharge pipe 29a to the rod chamber of the hydraulic cylinder, the cylinder rod 17a is pushed up and the shells 3a, 3b are rotated in the opening direction about the shafts 8a, 8b. During such opening and closing, if there is a difference in the forces applied to the links 5a and 5b due to a difference in reaction force between the shells 3a and 3b, the bracket 2
Force is applied to 5a, 25b, and the brackets 25a,
Although an attempt is made to tilt the bracket 25b in the left-right direction, since the guide members 27a to 27d contact both side surfaces of the frame 13, the tilting of the brackets 25a and 25b is prevented, and the force thereof is received by the frame 13.

Further, since the brackets 25a, 25b are rotatably connected to the end of the cylinder rod 17a via the shaft 23, the force applied to the links 5a, 5b is prevented from being applied to the cylinder rod 17a. The guide rollers 24a and 24b move up and down along the guide grooves 16a and 16b of the frame, thereby guiding the cylinder rod 17a to vertically move up and down, thereby facilitating the opening and closing of the bucket belt. Moreover, when closing the bucket, pressure oil is supplied to the bottom chamber of the hydraulic cylinder 17,
When opening, the pressure is supplied to the rod chamber, so opening is approximately twice as fast as closing due to the difference in pressure receiving area between the bottom chamber and the rod chamber.

In addition, in carrying out the present invention, various changes and additions are possible in addition to the above-mentioned embodiments. For example, a hanging member may be rotatably attached to the upper part of the frame 13. Furthermore, the brackets 25a and 25b can be manufactured by bending a single plate member, and the brackets, frame 13, etc. can be made thinner by having a structure having reinforcing means such as reinforcing ribs. Further, rollers may be used as the guide members 27a to 27d, and non-rotating guide members may be used instead of the guide rollers 24a and 24b.

As described above, in the present invention, the structure is such that the force applied to the bucket opening/closing link is received by the frame and is not applied to the hydraulic cylinder, so the rigidity of the hydraulic cylinder can be small, achieving a reduction in size and weight. be done. In addition, since we used a single-rod type hydraulic cylinder and attached it to the frame with the cylinder tube side facing up, there was no need for special processing such as machining an oil path on the cylinder rod, and a general hydraulic cylinder could be used. This also contributes to reducing the weight of the hydraulic cylinder and to lowering the bucket manufacturing cost.
Also, when excavating with a bucket (when closed), pressure oil is sent to the bottom side of the cylinder, which has a large pressure receiving area.
During earth removal (opening), pressure oil is sent to the rod side of the cylinder, which has a small pressure-receiving area, so a large digging force can be generated during excavation, and the soil can be removed quickly and mud can be removed easily, improving efficiency. do.

[Brief explanation of the drawing]

1 and 2 are front views showing a conventional clam shell bucket baggaget, respectively, FIG. 3 is a front view showing an embodiment of the clam shell bucket baggage bag according to the present invention, and FIG. A sectional view, FIG. 5 is a BB sectional view in FIG. 3, and FIG. 6 is a CC sectional view in FIG. 3a, 3b... Ciel, 5a, 5b... Link, 13... Frame, 15... Pivot frame,
16a, 16b...Guide groove, 17...Hydraulic cylinder, 23...Shaft, 24a, 24b...Guide roller, 25a, 25b...Bracket, 26a,
26b... shaft, 27a-27d... guide member.

Claims (1)

[Claims] 1 A frame with openings on both the left and right sides, vertical guide grooves on the front and rear surfaces, and a pivot frame for the left and right shells at the lower end, and a cylinder tube rotatably connected to the upper end of the frame. a single-rod hydraulic cylinder mounted in the frame with the cylinder rod facing downward; a guide member mounted on the end of the cylinder rod of the hydraulic cylinder and movable up and down along the guide groove;
a bracket whose lower end is pivoted to a shaft attached to the end of the cylinder rod, whose upper left and right ends protrude from the left and right openings of the frame, and which is connected to left and right bucket opening/closing links via the shaft; A hydraulic clam shell bucket comprising a guide means for moving the bracket up and down along a frame while preventing the bracket from tilting in the left and right direction.