JP2020060082A - Protection device of work machine cylinder rod - Google Patents

Abstract

To provide a cylinder rod protection device which solves the problem that in a work machine such as a crane truck, a shovel car, and a vehicle for high lift work, when a bare cylinder rod contacts an obstacle such as a building, sediment, rock in the site and obstacles such as a bucket of own work machine and is deformed, a hydraulic cylinder cannot be extended and contracted, a work stops until the hydraulic cylinder is repaired or replaced; and when the hydraulic cylinder contacts sediment falling off from the bucket and the surface of the bare cylinder rod is scratched, an oil seal is damaged to cause oil leakage.SOLUTION: A cylinder rod protection device includes a cylinder rod 3 which drives a work machine by a telescopic motion from a cylinder case 4 and a cover for protecting the cylinder rod, in which one end of the cover is fixed to the tip of the cylinder rod, the other end thereof is mounted with a support member having an adjustable height, and the support member is mounted on the cylinder case so as to always contact the cylinder case.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a protective cover for a cylinder rod provided in a work machine such as a crane truck, a shovel car, and an aerial work vehicle, and more particularly to a technique for a protective cover that is hard to break and is easy to remove and replace.

  Conventionally, working machines such as mobile cranes, shovel cars, and work vehicles at high places are generally provided with hydraulic cylinders such as boom cylinders, arm cylinders, and bucket cylinders as actuators. When the hydraulic cylinder expands and contracts, the cylinder rod moves in and out of the cylinder case, so the cylinder rod is exposed.

  If the exposed cylinder rod deforms due to contact with structures on the site, earth and sand, rocks, and obstacles such as the bucket of the working machine itself, the hydraulic cylinder will not be able to expand and contract, and work will stop until the hydraulic cylinder is repaired or replaced. . Further, if the exposed surface of the cylinder rod is damaged due to contact with earth and sand spilling from the bucket, the oil seal may be damaged and cause oil leakage.

  Therefore, Patent Document 1 discloses a working machine and a construction machine in which the cylinder rod of the hydraulic cylinder is provided with a protective cover so that the cylinder rod is not deformed or damaged. The cylinder rod cover protects the rod portion as the cylinder rod portion expands and contracts.

Patent No. 5818187

In the cylinder device of Patent Document 1, since the cover and the cylinder rod are fixed at one point, the cover may come into contact with the cylinder rod due to impact or cylinder contraction, and the cylinder rod may be damaged. Further, due to the mass of the cover, when the cylinder rod contracts, the cover bounces, which may damage the cover itself.
Further, since it is made of resin, there is a problem that it is deteriorated by ultraviolet rays and damaged by impact.

  A cover of a cylinder rod of the present invention which can solve the above-mentioned problems is provided in a working machine, and a tip of a cover body is fixed to a cylinder rod columnar tip portion, and a rear end portion of the cover always weights with a cylinder case. Contact with.

  The cylinder clamp and the cover are connected via a connecting rubber. It plays a role of shock absorption by attaching the connecting rubber.

Even if the cover is damaged, the cover can be removed and replaced easily.
The cover is made of iron.

  According to the cover of the cylinder rod of the present invention, the cylinder rod protection device can extend and retract from the cylinder case to protect the cylinder rod that drives the working machine.

  One end of the cover is fixed to the tip of the cylinder rod, and a height-adjustable support member is attached to the other end. Further, since it is attached to the cylinder clamp attached to the tip of the cylinder via the connecting rubber, the impact on the cylinder is reduced.

  Also, since the cover is made of iron, it can be assumed that it has strength and can withstand some impact. Further, the support member and the cover are fixed with screws, so that they can be easily attached and detached.

The schematic diagram showing the composition of a working device. It is an example of a shape for carrying out the present invention and is a maximum drawing of a cylinder rod. The minimum contraction figure of a cylinder rod which is an example of the shape which implements the present invention. FIG. 4 is a mounting view of a cylinder clamp tip portion, which is an example of a shape for carrying out the present invention. The figure which is an example of the shape which implements this invention, and is the figure which attached the connection rubber to the clamp. FIG. 5 is an example of a shape for carrying out the present invention, and is a view with a cover attached to FIG. 5-A. FIG. 3 is a detailed view of a connecting rubber, which is an example of a shape for carrying out the present invention. The whole figure showing an example of the shape which carries out the present invention. It is an example of the shape which implements this invention, and is a right side explanatory drawing of FIG.

  Hereinafter, a cylinder rod cover and a working machine according to embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are designated by the same reference numerals.

(Embodiment 1)
As shown in FIG. 5, the cylinder clamp 6 is a generic term for a pair of iron parts, which are a cylinder clamp upper part 6-A and a cylinder clamp lower part 6-B that are vertically aligned.
It is a member for fixing the cover body 9 to the cylinder rod 3.
Two holes are opened in parallel in the upper part of the cylinder clamp, and the connecting rubber 7 is provided with a fixing hole 7-A.
As shown in FIG. 4, the cylinder clamp is fixed to the cylinder rod tip portion 3-A so that the cylinder rod is sandwiched between the cylinder clamp upper portion 6-A and the cylinder clamp lower portion 6-B.

As shown in FIG. 6, the connecting rubber 7 is a component for joining the cylinder clamp 6 and the cover 9.
Further, the connecting rubber 7 is provided with two holes at each of the upper and lower parts, that is, four holes in total, and has a function of fixing the cylinder clamp 6 and the cover main body fixing hole by joining with a bolt or the like.
Using rubber as the material reduces the twisting due to impact. Rubber is the preferred material.

The cover body 9 is an iron workpiece for protecting the cylinder rod from crushed material.
As shown in the figure, the cover body has a semicircular shape on the left and right sides, and has a groove-shaped structure.

A flat bar 9-A is spot-welded to the bottom of the cover body 9, and its tip is bent in an L-shape.
It has a structure with two cover fixing holes at the tip,
A guide 10 is attached to the rearmost portion of the cover body.

  The cover body should be made of iron. This increases durability and reduces the likelihood of cylinder and cover damage.

The flat bar 9-A is a component for joining the connecting rubber 7.
When the L-shaped tip of the flat bar 9-A is attached to the cylinder clamp 6, two connecting rubbers 7 are used to sandwich the L-shaped tip of the flat bar 9-A, and an upper fixing hole of the connecting rubber 7 is provided. Secure with bolts through 7-A. Further, it is fixed to the cylinder clamp upper portion 6-A by bolts through the lower fixing hole 7-A of the connecting rubber 7.

The support member 10 is a component that is fixed to the rear end of the cover body 9 and that slides in contact with the surface of the cylinder case 4.
The support member 10 is composed of a resin spherical body 8 that contacts the cylinder case 4 and a bolt fixed to the spherical body.
As shown in FIG. 8, the support member is attached to the cover body 9 in a pair and symmetrically fixed to the rear end of the cover body. Further, the resin sphere 8 is fixed so as to always contact the surface of the cylinder case 4 symmetrically.
It also has the effect of preventing the cover body from bouncing due to impact.

  Since the pair of left and right resin-made spherical bodies 8 are always in contact with the cylinder case 4, the height is adjusted with bolts for mounting.

    It should be noted that the cylinder protection device of the present invention is not limited to the above-described illustrated examples, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.

1 Bucket 2 Arm 3 Cylinder Rod 3-A Cylinder Rod Tip 4 Cylinder Case 4-A Cylinder Case Tip 5 Bucket Ring 6 Cylinder Clamp 6-A Cylinder Clamp Upper 6-B Cylinder Clamp Lower 7 Connection Rubber 7-A Connection Rubber Fixing hole 8 Resin sphere 9 Cover body 9-A Flat bar 10 Support member

Claims (2)

In a cylinder rod protection device having a cylinder rod that expands and contracts from a cylinder case to drive a work machine and a cover that protects the cylinder rod,
One end of the cover is fixed to the tip end of the cylinder rod, and a height-adjustable support member is attached to the other end, and the support member is attached so as to be always in contact with the cylinder case. Protective device.   A cylinder clamp is fixed to the tip of the cylinder rod, a cover is attached to the tip through a connecting rubber, and the support member has a pair of left and right resin spherical bodies. The cylinder rod protection device according to claim 1, wherein the body is attached so as to always contact the upper surface of the cylinder case.

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