JPH0538062U - Working machine with blade - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the outer peripheral surface of the rod from being damaged when it extends from the tube due to collision with rocks, adhesion of sand and sand, and other causes. A rectangular screw seat 23 is provided on a mounting eye 22B of the rod 22, and a protective cover 24 having a length that completely covers the rod 12 and reaches the tube 11 even when the cylinder 21 is extended is provided on the screw seat 23. The bolts 25 and 25 are fastened together, and the inclined portion 24D of the protective cover 24 is bent obliquely downward to improve the strength.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a blade-equipped work machine such as a hydraulic excavator, a wheel loader, and a bulldozer, which is preferably used for excavating work.

[0002]

[Prior Art]

 6 to 8 show hydraulic excavators as an example of a conventional blade-equipped working machine.

In the figure, 1 is a hydraulic excavator main body as a working machine main body, and the hydraulic excavator main body 1 includes a lower traveling body 2, an upper revolving body 3 rotatably provided on the lower traveling body 2, The work device 4 is provided on the upper swing body 3 and is generally configured.

Reference numeral 5 denotes an earth removing device provided in the hydraulic excavator main body 1 for performing earth removing work. The earth removing device 5 is provided on the track frame 2A of the lower traveling body 2 between the left and right crawler tracks 2B. A pair of left and right support brackets 6 and 6 (only one shown), and a pair of left and right arms 7 and 7 rotatably supported by each support bracket 6 (only one shown). ), A blade 8 as an earth-discharging plate provided on the tip side of each arm 7, and a lifting cylinder 10 described later.

Here, as shown in FIG. 7, each arm 7 is provided with an arm body 7A, a boss portion 7B provided at a base end portion of the arm body 7A, and an upper portion protruding from an intermediate portion of the arm body 7A. And a bracket portion 7C, the boss portion 7B of each arm 7 is pivotally supported by the supporting bracket 6 via a pin 9.

Reference numeral 10 denotes an elevating cylinder for elevating and lowering the blade 8. The cylinder 10 is generally composed of a tube 11 and a rod 12 protruding from the tube 11, as shown in FIG. 11, a mounting eye 11B, which will be described later, is rotatably mounted on the bracket portion 7C of the arm 7 via a pin 13, and a rod 12 has a mounting eye 12B, which will be described later, mounted on the support bracket 6 via a pin 14 to the supporting bracket 6. It is located above and is pivotally supported.

Reference numeral 11 denotes a tube that constitutes the lifting cylinder 10. The tube 11 is fixed to a cylindrical tube body 11A and a base end side of the tube body 11A, and the lifting cylinder 10 is It is roughly composed of a mounting eye 11B for mounting on the arm 7 and pressure oil supply / discharge ports 11C, 11D respectively provided on the outer peripheral surface of the tube body 11A at the base end side and the tip end side. ing. Then, a supply / discharge pipe 11F having a mouthpiece 11E is attached to the pressure oil supply / discharge port 11C on the base end side, and the mouthpiece 11E of the supply / discharge pipe 11F is provided with a reinforcing member 11G on the pressure oil supply / discharge port 11D. It is connected on the tube main body 11A via.

Reference numeral 12 denotes a rod. The rod 12 has a proximal end side slidably inserted into the tube body 11A, and a rod body 12A fixed to a piston (not shown) in the tube body 11A, The rod main body 12A is generally composed of a mounting eye 12B provided on the front end side. The lifting cylinder 10 defines the inside of the tube body 11A into two oil chambers (not shown) by the pistons, and the pressure oil is supplied from the pressure oil supply / discharge ports 11C and 11D communicating with the oil chambers to the oil chambers. The piston is driven by supplying / discharging the rod to expand / contract the rod 12 from the tube 11.

Reference numeral 15 denotes a screw seat fixed to the outer peripheral surface of the tube body 11A on the distal end side by means of welding or the like. The screw seat 15 has two screw holes along the axial direction of the tube body 11A. 15A and 15A are formed.

Reference numeral 16 denotes a protective cover attached to the tube 11. The protective cover 16 is, for example, formed by bending a thin steel plate with a substantially U-shaped cross section, and extends in the axial direction of the rod 12. ing. The protective cover 16 is fastened to the screw seat 15 with bolts 17, 17 and is attached to the tip end side of the tube body 11A.

The prior art is configured as described above, and excavates work such as earth and sand by operating the work device 4 provided on the upper swing body 3. On the other hand, when the earth removing device 5 provided on the lower traveling body 2 is used for earth removing work, the rod 12 of the lifting cylinder 10 is extended to lower the arm 7 together with the blade 8 and to contact the lower surface of the blade 8. In the grounded state, the excavator main body 1 is advanced to perform earth removal work. After the earth removal operation, the rod 12 is contracted into the tube 11 to swing the arm 7 upward so that the blade 8 is lifted upward as shown by a chain double-dashed line in FIG.

The protective cover 16 is spaced from the upper side of the rod body 12A and covers the rod body 12A so that, for example, rocks dropped during excavation work collide with the rod body 12A of the lifting cylinder. Therefore, the outer peripheral surface of the rod body 12A is prevented from being damaged. In addition, during the earth unloading work, the earth and sand to be discharged passes over the upper end of the blade 8 and drops from the rear surface of the blade 8 toward the lower traveling body 2 side, and adheres to the outer peripheral surface of the rod body 12A while the rod is in contact with the rod body 12A. When 12 slides on the tube 11, the outer peripheral surface of the rod body 12A is damaged, and the protective cover 16 prevents this.

[0013]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional technique, the tip of the protective cover 16 comes into contact with the mounting eye 12B and the support bracket 6 to interfere with the operation of the lifting cylinder 10 and the protective cover 16 itself is not damaged when the rod 12 is contracted to the minimum. As described above, the length dimension of the protective cover 16 is formed shorter than the dimension of the rod 12 protruding from the distal end side of the tube 11 at the maximum extension. For this reason, if a large amount of earth and sand or rock falls on the lifting cylinder 10 during the earth unloading work, this earth and sand will be deposited on the upper surface of the protective cover 16, and the protective cover 16 will be discharged by the weight of the earth and sand as shown in FIG. The tip end side of the protective cover 16 may scrape and damage the outer peripheral surface of the rod main body 12A as shown by the dotted chain line. In this case, when the rod 12 expands or contracts, the seal inside the tube 11 may be damaged by this damaged portion. There is a problem that the oil liquid in the lifting cylinder 10 is damaged and flows out to the outside.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can reliably protect the outer peripheral surface of the rod of the lifting cylinder even when the rod of the lifting cylinder is greatly extended, and the oil It is an object of the present invention to provide a blade-equipped working machine capable of preventing the occurrence of liquid leakage.

[0015]

[Means for Solving the Problems]

 The feature of the configuration adopted by the present invention to solve the above-mentioned problem is that the rod of the lifting cylinder is provided with a screw seat fixed to the protruding end side of the rod, and the screw seat protects the protruding portion of the rod. In order to maximize the extension of the rod, the length of the rod reaches the tube, and the protective cover is bent in the circumferential direction along the outer peripheral surface of the tube so as to partially cover the outer peripheral surface of the tube. It is fixed through.

[0016]

[Action]

 With the above configuration, the protective cover bent in the circumferential direction along the outer peripheral surface of the tube has a convex curved shape to prevent sediment from accumulating, and to increase the strength against the sediment, thereby increasing the lifting cylinder's strength. The rod can be reliably protected by covering the rod with the protective cover even during the earth removing work in which the rod largely projects from the tube.

[0017]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. The same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

1 to 4 show a first embodiment of the present invention.

In the figure, reference numeral 21 denotes an elevating cylinder, which is substantially the same as the cylinder 10 described in the prior art, and a tube 11 and a later-described slidably inserted into the tube 11. It is roughly composed of a rod 22.

Reference numeral 22 denotes a rod, which is similar to the rod 12 described in the prior art, and has a piston (not shown) provided on the distal end side thereof, and the rod body 22A slidably inserted into the tube body 11A. And a mounting eye 22B provided on the tip end side of the rod body 22A, the mounting eye 22B of the rod 22 is provided with a screw seat 23.

Here, as shown in FIG. 4, the screw seat 23 is formed from a thick plate material into a rectangular shape having a length dimension substantially equal to the half diameter of the mounting eye 22B, and its width dimension is as shown in FIG. It is smaller than the width of the mounting eye 22B. The screw seat 23 is tangentially welded and attached to the upper surface of the rod body 22B. Further, the screw seat 23 is provided with two screw holes 23A and 23A at a portion corresponding to a contact point with the mounting eye 22B and a front portion located on the tube 11 side.

Reference numeral 24 denotes a protective cover formed of, for example, a thin steel plate, and the protective cover 24 extends from the mounting portion 24A provided on the mounting eye 22B side to the tube 11 side, When the rod 12 is maximally extended, the rod 12 is covered from the upper side, and the cover portion 24B has a length reaching the tube 11. Here, the central portions of the attachment portion 24A and the cover portion 24B form a rectangular flat portion 24C, and the flat portion 24C is provided with a peripheral portion along the outer peripheral surface of the tube 11 as shown in FIG. Is formed in a substantially "H" shape in the direction, and inclined portions 24D and 24D are formed in the middle of the mounting portion 24A and the cover portion 24B to gradually widen, whereby the protection cover 24 has a convex curved shape and has a predetermined interval. It is formed so as to face the tube 11 in the vertical direction.

The protective cover 24 is attached to the mounting portion 24A via bolts 25, 25 by tightening the screw holes 23A so as to cover the screw seat 23.

The present embodiment has the configuration described above, and the basic operation of protecting the rod 22 from above by the protective cover 24 covering the rod 22 protruding from the tube 11 and protecting the rod 22 from falling rocks, earth and sand, etc. There is no particular difference between the conventional technology and the conventional technology.

However, in this embodiment, the mounting eye 22B of the rod 22 is provided with the screw seat 23 extending toward the tube 11 with a predetermined length, and the screw seat 23 is secured with the protective cover 24 by the bolts 25, 25. The protective cover 24 was formed so as to completely cover the rod 12 and reach the tube 11 even at the maximum extension of the lifting cylinder 21, and then the rod 22 was extended to lower the blade 8. Even when the undercarriage 2 is advanced in this state and the earth unloading work is performed, the protection cover 24 can surely cover the rod 22 from the upper side to protect rocks, earth and sand, etc. falling on the lifting cylinder 10. The protruding portion of the rod 22 can be effectively protected by being repelled by the cover portion 24B of the cover 24 or being dropped along the inclined portions 24D.

Further, since the cover portion 24B has the inclined portions 24D and 24D bent downward in the left-right direction with respect to the central portion 24C, and is formed in a convex curved shape so as to be strong against bending load, Even if dirt or the like falls on the cylinder 21 and a large load acts on the protective cover 24, the protective cover 24 can be prevented from bending and deforming. Even if the protective cover 24 is flexed and deformed, the protective cover 24 has a sufficient length to reach the tube 11, so that the tip end side of the cover portion 24B comes into contact with the outer peripheral surface of the tube 11 to protect the protective cover 24. Further flexural deformation of 24 can be restricted, and the problem that the protective cover 24 comes into contact with the rod 22 and damages the rod body 22A can be solved. Therefore, the protective cover 24 can be formed as thin as possible, the cost such as material cost can be reduced, and the structure of the protective cover 24 and the like can be simplified. Various effects such as improved workability can be achieved.

Next, FIG. 5 shows a second embodiment of the present invention. In this embodiment, the same components as those described in the first embodiment described above are designated by the same reference numerals, and their description will be given. However, the feature of this embodiment is that the screw seat is formed as long as the diameter of the mounting eye.

In the figure, 31 indicates a rod according to the present embodiment, which is substantially the same as the rod 22 described in the first embodiment, and is composed of a rod body 31A and a mounting eye 31B. However, a screw seat 32 is fixedly provided on the mounting eye 31B of the rod 31.

Here, as shown in FIG. 5, the screw seat 32 is formed from a thick plate material into a rectangular shape having a length dimension substantially equal to the direct diameter of the mounting eye 31B, and the width dimension thereof is the width of the mounting eye 31B. It is smaller than the size. Further, the screw seat 32 has two screw holes 32A and 32A formed in a central portion in the length direction and a front portion located on the tube 11 side, and the screw seat 32 has a rod body 31A. Is tangentially welded to the upper surface of the.

The protective cover 24 is fastened to the screw seat 32 via two bolts 25 (not shown), as in the first embodiment.

In the present embodiment configured as described above, substantially the same operation and effect as those of the first embodiment can be obtained, but particularly in the present embodiment, the length dimension of the screw seat 32 is increased. Therefore, the mounting portion 24A of the protective cover 24 can be reliably supported from below by the screw seat 32 in the longitudinal direction, and the mounting portion 24A of the protective cover 24 can be more effectively prevented from bending downward. In addition to the prevention, it is possible to more effectively prevent the cover body 24B of the protective cover 24 from rattling due to vibration or the like.

In each of the above-described embodiments, the cover portion 24B of the protective cover 24 is projected from the flat portion 24C having a flat plate shape and the inclined portions 24D and 24D that are bent downward from the flat portion 24C in the left-right direction. Although the present invention has been described as being formed in a curved shape, the present invention is not limited to this, and the cover portion 24B of the protective cover 24 may be formed in an arc shape in section so as to be curved along the outer peripheral surface of the tube 11.

[0033]

[Effect of the device]

 As described above in detail, in the present invention, the rod of the lifting cylinder is provided with the screw seat fixed to the projecting end side of the rod, and the screw seat has the maximum extension to protect the projecting part of the rod. Since the protective cover is long enough to reach the tube and is bent in the circumferential direction along the outer peripheral surface of the tube so as to partially cover the outer peripheral surface of the tube, it is fixed with a plurality of bolts. The cross section of the protective cover has a convex curved shape, so that the protective cover can be made strong against a load from the upper side, and the protective cover has a shape that does not easily accumulate sediment, and It is possible to prevent bending deformation due to weight.

In addition, since the upper side of the rod is covered with the protective cover even during the earth unloading work in which the rod largely protrudes from the tube, the protective cover repels rocks and earth and sand falling on the lifting cylinder and the protective cover. Since it can be dropped along the outer peripheral surface of the rod, the protruding portion of the rod can be reliably protected. Even if the protective cover bends downward, the tip side of the protective cover comes into contact with the outer peripheral surface of the tube, and further bending deformation can be regulated. The outer peripheral surface can be prevented from being damaged, and the life of the lifting cylinder can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing a lifting cylinder, a protective cover, and the like according to a first embodiment of the present invention.

FIG. 2 is a partial plan view showing a state in which the lifting cylinder in FIG. 1 is attached to a support bracket of a lower traveling body.

FIG. 3 is an enlarged sectional view taken along the line III-III in FIG.

FIG. 4 is an enlarged view of a main part of a rod showing a state where a screw seat is fixed to a mounting eye.

FIG. 5 is an enlarged view of a main part similar to FIG. 4 showing a second embodiment.

FIG. 6 is an overall view showing a hydraulic excavator according to a conventional technique.

FIG. 7 is an enlarged view of a main part of the soil discharging device shown in FIG.

FIG. 8 is a front view showing a lifting cylinder, a protective cover and the like according to a conventional technique.

[Explanation of symbols]

 1 Hydraulic excavator main body (working machine main body) 2 Lower traveling body 7 Arm 8 Blade 11 Tube 21 Lifting cylinder 22,31 Rod 23,32 Screw seat 24 Protective cover 25 Bolt

Claims (1)

[Scope of utility model registration request] 1. A movable working machine main body, an arm having a base end side rotatably attached to the working machine main body, a distal end side protruding from the working machine main body, and an arm provided on the distal end side of the arm, and descending. Sometimes a blade for soil removal work and a tube and a rod protruding from the tube are provided between the working machine main body and the arm in order to move the blade up and down through the arm. In a working machine with a blade consisting of an elevating cylinder having, a rod of the elevating cylinder is provided with a screw seat fixed to a protruding end side of the rod,
The screw seat has a length that reaches the tube even at maximum extension of the rod to protect the protruding portion of the rod,
A blade-equipped working machine characterized in that a protective cover bent in the circumferential direction along the outer peripheral surface of the tube so as to partially cover the outer peripheral surface of the tube is fixed via a plurality of bolts.