JPH10292426A - Protective device for hydraulic cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply fit the protective device for a hydraulic cylinder with no special mechanical machining and adjust the manufacturing dispersion of members, if any. SOLUTION: This protective device for a hydraulic cylinder 36A driving a work machine is provided with a tube guard 4 fixed to the tube 36a of the hydraulic cylinder 36A to cover the tube 36a and a rod guard 16 fixed to the rod 36b of the hydraulic cylinder 36A to cover the rod 36b and capable of being slidably moved in the axial direction against the tube guard 4 interlockingly with the expanding/shrinking action of the rod 36b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection device for a hydraulic cylinder of a working machine used in a construction machine such as a hydraulic shovel or the like, and more particularly, to a device for preventing obstacles such as falling rocks and foundation beams in tunnels and subway works. The present invention relates to a protection device for preventing damage to a hydraulic cylinder due to contact.

[0002]

2. Description of the Related Art First, a hydraulic excavator 20 is shown in FIG.
This will be described below. The lower traveling body 21 can travel freely by a traveling motor (not shown). An upper revolving unit 23 that can be turned by a turning motor (not shown) is mounted on an upper portion of the lower traveling unit 21 via a swing circle 22. The boom 31 of the working machine 30 is
A machine cab 26, a cab 27, and a counterweight 28 are attached. The work machine 30 includes the upper rotating body 23
, A boom 31, an arm 33, and a bucket 35, which are sequentially connected to a bracket (not shown) disposed in the bracket. The boom 31, the arm 33, and the bucket 35 are driven by hydraulic cylinders 32, 34, 36, respectively. The hydraulic cylinder 36 that drives the bucket 35 includes:
There is a problem in that it is damaged by falling rocks or collision with obstacles such as foundation beams in tunnel or subway construction.

[0003] As a prior art of a hydraulic cylinder protection device, for example, according to Japanese Utility Model Laid-Open No. 2-65704, a guide support member is provided on an outer portion of a cylinder of a hydraulic cylinder, and a long plate member is provided on an outer portion of a rod tip boss. In the protection device for a hydraulic cylinder, wherein the guide support member and the plate member are supported so as to be relatively movable in the cylinder longitudinal direction, a cylindrical guide support member is provided on the upper surface side of the base end boss of the cylinder cylinder. The rear end is rotatably pivoted in the front-rear direction in the same direction as the cylinder longitudinal direction. On the other hand, a plate member is provided on the upper surface side of the rod tip boss, and the plate member rear side is inside the cylindrical guide support member. And a buffer member is interposed between the cylinder cylinder and the guide support member.

As a prior art of a protection device for a hydraulic cylinder, the present applicant has filed Japanese Utility Model Application Laid-Open No. 4-99754. According to the publication, a cross-section is formed in an inverted U-shape so as to cover the entire hydraulic cylinder from above, and a cover member having an enlarged portion in a width direction is formed at a rear portion in a longitudinal direction, and a rod side of the hydraulic cylinder is sandwiched. A pin provided on both sides of a rear end of the cover member engages with both sides of a pin for rotatably supporting the hydraulic cylinder on the bottom side, and is provided on the band member. The mounting part and the front part of the cover member are fixed by fastening means such as bolts. As prior arts of other hydraulic cylinder protection devices, Japanese Unexamined Utility Model Publication No. 3-103352 and Japanese Unexamined Patent Application Publication No.
No. 98701 has been filed.

[0005]

However, in the hydraulic cylinder protection device described in Japanese Utility Model Laid-Open No. 2-65704, the cylindrical guide support member provided on the upper surface side of the base end boss of the cylinder cylinder and the upper surface of the rod end boss. In order to mount the plate member provided on the side, it is necessary to provide a bracket on the cylinder cylinder and the rod or to machine the bracket.
For this reason, a hydraulic cylinder of a standard specification cannot be used, and it becomes a dedicated hydraulic cylinder, resulting in an increase in cost. Further, in the above structure, the rod is protected, but there is a problem that the protection of the cylinder cylinder is not sufficient. Conversely, the hydraulic cylinder protection device described in Japanese Utility Model Laid-Open No. 4-99754 has a problem that the hydraulic cylinder tube is protected but the cylinder rod is not protected.

The hydraulic cylinder protection device described in Japanese Utility Model Laid-Open No. 3-103352 has a problem that the cylinder rod is protected but the hydraulic cylinder tube is not protected. In the hydraulic cylinder protection device described in JP-A-1-98701, it is necessary to add a rail to the hydraulic cylinder tube, which increases the cost.

The present invention pays attention to the above-mentioned conventional problems. In order to prevent damage to the hydraulic cylinder due to contact with obstacles such as falling rocks and foundation beams in tunnels and subway works, the hydraulic cylinder of the present invention is used. The protection device has a structure that can be easily attached to the hydraulic cylinder tube and rod without machining, so that it can be applied to standard hydraulic cylinders used in other construction machines and protects the hydraulic cylinder tube and rod. It is another object of the present invention to provide a hydraulic cylinder protection device in which a slide portion between a hydraulic cylinder tube guard and a rod guard has a structure capable of adjusting a gap.

[0008]

In order to achieve the above object, a first invention of a hydraulic cylinder protection device according to the present invention is provided by a link such as a boom, an arm, and a bucket sequentially connected from a vehicle body. Working machine, a hydraulic cylinder attached to the bracket of each link of the working machine and driving the working machine, and a hydraulic cylinder protection device including a guard for protecting the hydraulic cylinder, the hydraulic cylinder 36A Fixed to the tube 36a, and
The tube guard 4 covering the tube 36a and the rod 36b of the hydraulic cylinder 36A are fixed to the tube guard 4 and slidably movable in the axial direction with respect to the tube guard 4 in conjunction with the expansion and contraction of the rod 36b. , Rod 3
6b and a rod guard 16 for protecting the same. According to the above configuration, the tube guard 4 that covers the tube 36a of the hydraulic cylinder 36A and the rod guard 16 that covers the rod 36b of the hydraulic cylinder 36A are provided, and the rod guard 16 is moved in the axial direction with respect to the tube guard 4. Since it is possible, the tube 36a and the rod 36a can be
b is guarded. Therefore, it is possible to prevent damage to the hydraulic cylinder due to contact with obstacles such as falling rocks and foundation beams in tunnel and subway construction. The hydraulic cylinder protection device of the present invention can be applied to all hydraulic cylinders that drive working machines such as construction machines. In addition, the protection device for a hydraulic cylinder of the present invention can be easily mounted on a standard specification hydraulic cylinder used for various construction machines, so that the cost is low. It is useful for construction machines that work in many narrow places.

According to a second aspect of the present invention, in the configuration of the first aspect, the tube guard 4 has one end attached to the bottom end 36c of the tube 36a and the other end attached to the head side of the tube 36a.
And one end is attached to the rod end 36e of the rod 36b, and the other end is provided with a rod guard 16 slidably mounted on the tube guard 4. According to the above configuration, the tube 36a of the hydraulic cylinder and the tube guard 4 are detachable, and the tube guard 4
In contrast, the rod guard 16 is detachable. Therefore, the tube guard 4 and the rod guard 16 are attached to the standard specification hydraulic cylinder used in various construction machines.
Can be added on, and the cost is low.

In a third aspect of the present invention, in the configuration of the first or second aspect, a buffer member 4c is interposed between the tube guard 4 and the tube 36a of the hydraulic cylinder 36A. According to the above configuration, even if the tube guard 4 or the rod guard 16 has a falling rock or a collision, the cover 4b is operated by the buffer member 4c interposed between the cover 4b and the hydraulic cylinder tube 36a.
b and the hydraulic cylinder 36A can be reliably prevented from being damaged.

According to a fourth aspect, in the configuration according to any one of the first to third aspects, the tube guard 4 is fixed to a tube 36a of the hydraulic cylinder 36A with a band 7. is there. According to the above configuration, no machining is performed on the hydraulic cylinder 36A,
Using the band 7, the protection device can be easily mounted at the work site. Therefore, the protection device can be easily mounted on the standard hydraulic cylinder, and the manufacturing cost is low.

According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, the rod guard 1 is provided.
6 is a sliding member 11 attached to the tube guard 4.
And is slidable. According to the above configuration, the rod guard 16 can move in the front-rear direction by engaging with the tube guard via the sliding member 11,
The slide can be made a protective device with no play and a smooth slide. Therefore, the protection device of the hydraulic cylinder does not break down even if it is used for a long time, and the durability is improved.

According to a sixth aspect of the present invention, in the configuration according to any one of the first to fifth aspects, a pair of U-shaped rails 17 attached to the rod guard 16 are provided.
7 and a sliding member 11 attached to the tube guard 4 in a slidable manner. According to the above configuration, since the rod guard 16 and the tube guard 4 are slidably engaged by the rail 17,
The pair of U-shaped rails 17 can move only in the sliding direction in the axial direction, and can smoothly move with the expansion and contraction of the hydraulic cylinder 36A, so that the rod guard does not fall off the tube guard. Therefore, the rod guard and the tube guard do not break down even if they are used for a long time.

According to a seventh aspect of the present invention, in the configuration of the fifth or sixth aspect, a plate 4e for attaching a sliding member attached to the cover 4b of the tube guard 4 is provided.
And a shim 12 for adjusting a gap between the sliding member 11 and the sliding member 11. According to the above configuration, an error due to a variation in the production of the tube guard 4 can be corrected by adjusting the position of the sliding member 11 with the shim 12, so that the production and assembly are easy and the cost is low.

According to an eighth aspect of the present invention, in the configuration of the fifth or sixth aspect, a position adjusting plate (4g) attached to the cover 4b of the tube guard 4 and a slide attached to the plate (4g). A spring (43) interposed between the moving member (11) is provided. According to the above configuration, even if there is a variation in manufacturing the members 4, 4b, 4e, the error can be absorbed by biasing the sliding member 11 by the spring 43. Even if the sliding member 11 is worn, it is automatically moved to a normal position because the sliding member 11 is urged by the spring 43. Therefore, even if the protection device for a hydraulic cylinder of the present invention is used for a long time, the function does not deteriorate, and the protection of the hydraulic cylinder can be reliably performed without play.

According to a ninth aspect, in the configuration of the fifth or sixth aspect, the position of the sliding member 11 in the left-right direction is adjusted.
Further, a bolt for attaching the sliding member 11 to the tube guard 4 and a position adjusting plate 45 having an elongated hole 45a for inserting the bolt are provided. According to the above-described configuration, even if there is a variation in manufacturing each member or the sliding member 11 is worn, the position adjusting plate 4
The position can be adjusted by the long hole 45 a provided in the fifth hole 5. Therefore, even if the protection device for a hydraulic cylinder of the present invention is used for a long time, the function does not deteriorate, and the protection of the hydraulic cylinder can be reliably performed without play.

According to a tenth aspect of the present invention, in the configuration of the fifth or sixth aspect of the present invention, the sliding members 11, 11 are attached to the cover 4b of the tube guard 4, and the A pair of left and right plates 45A to be urged,
45A. According to the above configuration, even if there is a variation in manufacturing the members 4, 4b, and 45A, the error can be absorbed by biasing the sliding member 11 by the spring 47. Even if the sliding member 11 is worn, it is automatically moved to a normal position because the sliding member 11 is urged by the spring 47. Therefore, even if the protection device for a hydraulic cylinder of the present invention is used for a long time, the function does not deteriorate, and the protection of the hydraulic cylinder can be reliably performed without play.

According to an eleventh aspect of the present invention, in the configuration according to any one of the first to tenth aspects, the cover 4b of the tube guard 4 is made detachable by a plate 5 and bolts, and , The bottom of the tube of the hydraulic cylinder for driving the working machine with the hole of the plate 5 and the pin 2 for mounting the bottom end 36c so as to be rotatable. According to the configuration described above, after the bottom end 36c of the tube of the hydraulic cylinder is attached to the bracket of the working machine link with the pin 2, the tube guard 4 is attached to the pin 2 via the plate 5 with the bolt 6. Therefore, when assembling the hydraulic cylinder and the tube guard, it is not necessary to suspend and position both of them at the same time, and they can be operated separately, which facilitates the assembling operation.

According to a twelfth aspect, in the configuration according to any one of the first to eleventh aspects, the hydraulic cylinder 3
A tube guard 4 is mounted coaxially with the pin 2 for mounting the bottom end 36c of the 6A tube 36a, and one end is mounted coaxially with the pin 3 for mounting the rod end 36e of the rod 36b of the hydraulic cylinder 36A. , The other end is a tube guard 4
And a rod guard 16 which is slidably mounted on the arm. According to the above configuration, since the tube guard 4 and the rod guard 16 are mounted coaxially with the pins 2 and 3, respectively, both guards 4 and 16 make the same movement as the rotation of the hydraulic cylinder 36A. Since no uneven load or the like acts on the sliding portion between the tube guard 4 and the rod guard 16, the durability of the sliding portion is improved.

According to a thirteenth aspect, in the configuration according to any one of the first to twelfth aspects, the tube guard 4 is provided with a hydraulic pipe 36f of the hydraulic cylinder 36A.
The cover 4f that protects the cover is fixed. According to the above configuration, the hydraulic piping disposed near the tube 36a of the hydraulic cylinder 36A is protected by the cover 4f. Thus, the hydraulic piping is not damaged even if a rock falls or the like.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a hydraulic cylinder protection device according to the present invention will be described below with reference to FIGS. First, a first embodiment will be described with reference to FIGS.
First, a construction machine 20A such as a hydraulic shovel according to the present invention shown in FIG. 1 will be described. The lower traveling body 21A can travel freely by a traveling motor (not shown). An upper swing body 23A (hereinafter, referred to as a vehicle body 23A) that can swing by a swing motor (not shown) is mounted on an upper portion of the lower traveling body 21A via a swing circle 22A.
A boom 31A of a working machine 30A, a machine cab 26A, a cab 27A, and a counterweight 28A are attached to the vehicle body 23A. The working machine 30A is a vehicle body 23A
, A boom 31A, an arm 33A, and a bucket 35A which are sequentially connected to a bracket (not shown) provided in the first embodiment. The boom 31A, the arm 33A, and the bucket 35A are driven by hydraulic cylinders 32A, 34A, 36A, respectively. Since the construction machine 20A is used for tunnel and subway construction, in order to prevent damage to the hydraulic cylinder due to contact with obstacles such as falling rocks and foundation beams, the conventional arrangement of hydraulic cylinders 32 and 34 shown in FIG. In contrast, a hydraulic cylinder 32A for driving the boom 31A and a hydraulic cylinder 34 for driving the arm 33A shown in FIG.
A is attached to the lower surface side of each boom 31A.

Hydraulic cylinder 3 for driving bucket 35A
Since 6A cannot be mechanically attached to the lower surface of the arm 33A, it is attached to the upper surface of the arm 33A, similarly to the hydraulic cylinder 36 of the bucket 35 shown in FIG. Therefore, a protection device is required to prevent the falling rocks and the beams of the foundation from being damaged by collision as described above.
Hereinafter, the protection device 10 for the hydraulic cylinder 36A that drives the bucket 35A will be described. The protection device for a hydraulic cylinder according to the present invention will be described as a protection device 10 for a hydraulic cylinder 36A that drives a bucket 35A.
It is needless to say that the present invention can be applied to a protection device for hydraulic cylinders 32A and 34A that drive a working machine such as 1A and an arm 33A. As shown in FIG. 2, the protection device 10 for the hydraulic cylinder 36A includes a guard 4 (hereinafter, referred to as a tube guard 4) for protecting a tube 36a of the hydraulic cylinder, and a rod guard 16 for a cylinder rod 36b. The rod guard 16 is slidably engaged via a sliding member 11 described below attached to the tube guard 4. Next, the hydraulic cylinder 36A that drives the bucket 35A will be described with reference to FIGS. Hydraulic cylinder 36A shown in FIG.
The bottom end 36c of the tube 36a is rotatably attached to the bracket 33a of the arm 33A by the pin 2. The rod end 36e of the rod 36b of the hydraulic cylinder 36A, the tilt link 37, and the bucket link 38, which are shown in FIG.

Next, the tube guard 4 will be described. As shown in FIG. 3, the bottom end 36c of the tube 36a of the hydraulic cylinder 36A is connected to the bracket 33a of the working machine.
Are attached by pins 2. The rear end of the tube guard 4 is attached to the pin 2 via a plate 5. Thereby, the tube guard 4 is connected to the hydraulic cylinder 36.
A can rotate around the pin 2 together with A. Also,
The front end of the tube guard 4 is fixed to the hydraulic cylinder 36A by a band 7 described later. C- in FIGS. 2 and 2
The tube guard 4 shown in FIG. 5 of the C sectional view is provided with a cover 4b formed in an arc shape from the rear end to the front end. As shown in FIG. 5, a fan-shaped cushioning member 4c is adhered to the inside of the cover 4b. This buffer member 4
In FIG. 5, c represents an elastic body such as rubber, but other than this, an elastic body such as a spring may be used. In addition, seats 4d,
4d is fixed. This cover 4b is used as a cushioning member 4c.
The tube 36a of the hydraulic cylinder is clamped by the band 7 via the. Tube guard 4 attaches band 7 to seat 4
It is elastically attached to the hydraulic cylinder tube 36a by tightening the bolts 8 to d and 4d.

5 and FIG. 5, which are sectional views taken along the line D--D in FIG.
As shown in FIG. 7 which is a cross-sectional view taken along the line EE in FIG. 6, a pair of plates 4e, 4e separated from each other is fixed to the upper part of the cover 4b. As shown in FIG. 7, the sliding members 11 of the plates 4e and 4e shown in FIG. 5 are attached to the inside and outside of the front and rear two places by bolts 15 via the collars 13 and 14, respectively. The outer sliding member 11 shown in FIG.
and the shim 12 is sandwiched between the e. The bolt hole diameter D of the plate 4e is larger than the outer diameter d of the bolt 15, so that the vertical gap of the sliding member 11 can be adjusted. As shown in FIG. 6, the sliding member 11 is vertically symmetrical with respect to the center line L. The cover 4b shown in FIG.
A cover 4f for protecting the hydraulic piping 36f is integrally fixed.

Next, the rod guard 16 will be described. As shown in FIG. 4 in a sectional view taken along the line BB of FIGS. 2 and 2, a substantially U-shaped bracket 16a is provided at the front end of the rod guard 16.
Is fixed. The rod guard 16 has a hydraulic cylinder rod end 36e rotatably attached by a pin 3 via a bracket 16a. A substantially U-shaped cover 16b extending rearward from the bracket 16a is fixed to the rod guard 16. A pair of right and left U-shaped rails 17 are fixed to the inner surface of the cover 16b. As shown in FIG. 7, the rail 17 is provided with a U-shaped groove 17a. The sliding member 11 is inserted into the groove 17a. The rod guard 16 is slidably engaged with the tube guard 4 via the sliding member 11 in the front-rear direction.

The hydraulic cylinder protection device of the present invention shown in FIGS. 1 to 7 will be described in detail. (1) As shown in FIG. 2 and FIG.
The rear end of the tube 36a of the hydraulic cylinder 36A is attached to a by the pin 2. Separately from this, the bracket 4a of the tube guard 4 is attached to the bracket 33a of the working machine by the bolt 6 via the plate 5. The front end of the tube guard 4 is fixed to the front end of the hydraulic cylinder tube 36a by a band 7, as shown in FIG. For this reason, when attaching the protection device for the hydraulic cylinder as in the prior art, it was necessary to machine the hydraulic cylinder. However, the protection device 10 of the present invention does not require machining, but the tube 36a of the hydraulic cylinder 36A is used. Can be attached to cover. Thereby, the bracket 4a of the tube guard 4 is attached to the bracket 33a of the working machine with the bolt 6 via the plate 5, and the hydraulic cylinder 36A is attached to the pin 2 so that it can be assembled separately. Good assemblability. Further, the cover 4b of the tube guard 4 covers the entire surface from the front end to the rear end of the hydraulic cylinder tube 36a. As a result, problems such as damage to the hydraulic cylinder tube 36a do not occur even when the vehicle hits an obstacle such as a falling rock in a tunnel or a subway construction or a beam on a foundation. Further, as shown in FIG. 5, the hydraulic piping 36f disposed near the hydraulic cylinder tube 36a is protected by the cover 4f fixed to the cover 4b, so that it is not damaged by falling rocks or the like. Further, since the cushioning member 4c is provided between the cover 4b and the hydraulic cylinder tube 36a shown in FIG. 5, even if a rock falls and falls on the tube guard 4 or the rod guard 16, the hydraulic cylinder It does not damage 36A. Furthermore, even if the hydraulic cylinder 36A swings due to the operation of the work machine, the buffer member 4c interposed between the hydraulic cylinder and the tube guard 4 bends, so that excessive force is not applied to the tube guard. Has become.

(2) As shown in FIGS. 2 and 4, one end of the rod guard 16 is connected to the rod end 36 of the hydraulic cylinder rod 36b.
e, and the other end is slidably engaged with the sliding member 11 attached to the tube guard 4 as shown in FIG. Can be attached without any work. In addition, rod guard 1
6 is a cover 1 extending rearward from the bracket 16a to simultaneously stroke with the hydraulic cylinder rod 36b.
With 6b, the hydraulic cylinder rod 36b can always be completely protected. Therefore, the hydraulic cylinder 36A
The durability can be improved because damage due to falling rocks can be prevented. (3) As shown in FIGS. 5 and 7, the rod guard 16 is a slide in which the side surface 17b and the lower surface 17c of the groove 17a of the rail 17 having a pair of right and left U-shaped grooves are attached to the tube guard 4. Since it is slidably engaged with the member 11 with appropriate gaps S1 and S2, the hydraulic cylinder 36A can smoothly move with the expansion and contraction without detaching from the tube guard 4. (4) As shown in FIG. 6, since the sliding member 11 is vertically symmetrical with respect to the center line L, the sliding member 11 can be turned upside down and exchanged between inside and outside. (5) As shown in FIG. 7, the plate 4e and the outer sliding member 1
1, the shim 12 is sandwiched between the sliding members 1.
1 can be adjusted in the left-right direction. Further, since the bolt hole diameter D of the plate 4e is larger than the outer diameter d of the bolt 15, the position of the sliding member 11 in the vertical direction can be adjusted. Thus, even if the sliding member 11 is worn, the gap can be adjusted by turning the sliding member 11 upside down, switching between inside and outside, and adjusting the position in the vertical and horizontal directions. Time is extended and replacement is also possible partially. Thereby, the user cost is reduced, and the tube guard 4 and the rod guard 1 are reduced.
6 can be corrected by adjusting the position of the sliding member 11, so that the manufacturing and assembly are easy and the cost is low.

Next, another embodiment (a), (b) and (c) of a method for adjusting the position of the sliding member 11 will be described with reference to FIGS. FIG. 8 shows an embodiment (a) in which the position of the left sliding member 11 in the figure can be automatically adjusted. The inner and outer sliding members 11 are fastened to each other by bolts 42 with the two inner and outer collars 41 facing each other with the position adjusting plate 4g of the tube guard 4 interposed therebetween. In this state, the disc spring 43 is inserted between the outer collar 41 and the position adjusting plate 4g. Due to this spring force, the outer end face of the left sliding member 11 always comes into contact with the side face 17b of the U-shaped groove 17a of the rail 17. Further, a gap S3 is provided between the inner collar 41 and the position adjusting plate 4g in consideration of the wear allowance of the sliding member 11. Further, the bolt hole diameter D of the plate 4g is larger than the outer diameter d of the bolt 42 so that the vertical gap of the sliding member 11 can be adjusted. According to such an embodiment, the outer end surface of the sliding member 11 is always a U-shaped groove 17.
Since the sliding member 11 is in contact with the side surface 17b, there is no need to adjust the sliding member 11 even when the sliding member 11 is worn, thereby improving the operating rate of the vehicle.

FIG. 9 shows an embodiment (b), which is shown in FIG.
The sliding member 11, the rail 17, the U-shaped groove 17a, and the side surface 17b have the same configuration and are omitted in FIG. 9, but will be described with reference to FIG. The sliding member 11 shown in FIG. 9 is attached to a position adjusting plate 45, and the position adjusting plate 45 is attached to the tube guard 4A with bolts 46. Bolt hole 4 provided in tube guard 4A
5a is a long hole in the left-right direction. According to this embodiment, when the outer end surface of the sliding member 11 is worn, the bolt 46 is loosened and the position adjusting plate 45 is moved in the left-right direction, as shown in FIG. The gap between the side surface 17b of the U-shaped groove 17a and the outer end surface of the sliding member 11 is S
The adjustment work is simple because the position may be adjusted to be 1.

FIG. 10 shows an embodiment (c), in which a plate 45A to which a spring receiver 45b is fixed is provided on the position adjusting plate 45 of the embodiment (b) in FIG. A spring 47 is provided between the left and right position adjusting plates 45A. According to such an embodiment, just by loosening the bolt 46, the left and right position adjusting plates 45A, 45A are automatically moved outward by the spring force, and the position of the sliding member 11 is adjusted.

In the present invention, the protection device for a hydraulic cylinder described in the above embodiment covers the tube guard 4 covering the upper surface of the tube 36a of the hydraulic cylinder 36A and the upper surface of the rod 36b of the hydraulic cylinder 36A. Rod guard 1
6 and the tube guard 4 and the rod guard 1
6 can be moved in the front-rear direction, so that the tube 36a and the rod 36b are guarded even when the hydraulic cylinder 36A expands / contracts or stops driving. Therefore, it is possible to prevent damage to the hydraulic cylinder due to contact with obstacles such as falling rocks and foundation beams in tunnels and subway construction. The hydraulic cylinder protection device of the present invention can be applied to all hydraulic cylinders that drive working machines such as construction machines. In addition, the hydraulic cylinder protection device of the present invention can be easily mounted on a standard hydraulic cylinder, and is particularly useful for construction machines that work in narrow places with many obstacles, in addition to tunnels and subway works.

Further, even if a rock falls on the tube guard 4, the hydraulic cylinder 36 is actuated by the buffer member 4c interposed between the cover 4b and the hydraulic cylinder tube 36a.
A can be reliably prevented from being damaged.

Furthermore, the protection device can be easily mounted at the work site using the band 7 without performing any machining on the hydraulic cylinder 36A. As a result, the protection device can be easily attached to the standard hydraulic cylinder, and the manufacturing cost is low.

The rod guard 16 is connected to the sliding member 11.
The protective device can be moved in the front-rear direction by engaging with the tube guard 4 through the through hole, and the slide device can be a slide device without play. As a result, the protection device for the hydraulic cylinder does not break down even when used for a long time, and the durability is improved.

Further, since the rod guard 16 and the tube guard 4 are slidably engaged with each other by the rail 17, the movement accompanying the expansion and contraction of the hydraulic cylinder 36A can be performed smoothly. Thus, the rod guard and the tube guard do not break down even when used for a long time.

Furthermore, since errors due to variations in the production of the tube guard 4 can be corrected by adjusting the position of the sliding member 11 with the shim 12, the production and assembly are easy and the cost is low.

Further, even if there is a variation in the manufacture of the members 4, 4b, 4e, the error can be absorbed by biasing the sliding member 11 by the spring 43. Moreover, even if the sliding member 11 is worn, it is automatically moved to a normal position because the sliding member 11 is urged by the spring 43. As the spring, a disc spring, a leaf spring, or the like may be used. Accordingly, the function of the hydraulic cylinder protection device of the present invention does not deteriorate even after long-term use, and the hydraulic cylinder can be protected without any backlash.

Further, even if the members of the protection device for the hydraulic cylinder are varied or the sliding member 11 is worn out, the position can be adjusted by the long holes provided in the position adjusting plate 45. Thereby, the function of the protection device for the hydraulic cylinder of the present invention does not decrease even when used for a long time,
It is possible to reliably protect the hydraulic cylinder without play.

Furthermore, even if there are variations in the production of the members 4, 4b, 45A of the protection device for the hydraulic cylinder,
By biasing the sliding member 11 with the spring 47, the error can be absorbed. Even if the sliding member 11 is worn, it is automatically moved to a normal position because the sliding member 11 is urged by the spring 47. Accordingly, the function of the hydraulic cylinder protection device of the present invention does not deteriorate even after long-term use, and the hydraulic cylinder can be protected without any backlash.

Further, at the time of assembling the hydraulic cylinder and the tube guard, it is not necessary to suspend and position both of them at the same time, and they can be operated separately, so that the assembling work is facilitated.

The tube 3 of the hydraulic cylinder 36A
A hydraulic pipe 36f disposed near the cover 6f is provided with a cover 4f.
, The hydraulic piping 36f is not damaged even if a rock falls.

[Brief description of the drawings]

FIG. 1 is a side view of a construction machine.

FIG. 2 is a side view of the hydraulic cylinder protection device according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a sectional view taken along the line CC of FIG. 2;

FIG. 6 is a sectional view taken along the line DD in FIG. 5;

FIG. 7 is a sectional view taken along the line EE of FIG. 6;

FIG. 8 is a view showing another embodiment (a) of the method for adjusting the position of the sliding member.

FIG. 9 is a view showing another embodiment (b) of the method for adjusting the position of the sliding member.

FIG. 10 is a view showing another embodiment (c) of the same method for adjusting the position of the sliding member.

FIG. 11 is a side view of a conventional construction machine.

[Explanation of symbols]

2 ... pin, 4 ... tube guard, 4b, 4f ... cover,
4c: buffer member, 4e: plate for attaching sliding member, 4
g, 45: position adjusting plate, 7: band, 10: protective device, 11: sliding member, 12: shim, 16: rod guard, 17: U-shaped rail, 20A: construction machine, 23
A: upper revolving superstructure (vehicle body), 31A: boom, 33A: arm, 35A: bucket, 32A, 34A, 36A: hydraulic cylinder, 36a: tube (hydraulic cylinder), 36
b: rod (hydraulic cylinder), 36f: hydraulic piping, 4
3, 47 ... spring, 45A ... plate, 45a ... long hole (position adjustment plate).

Claims (13)

[Claims] 1. A working machine comprising links such as a boom, an arm and a bucket sequentially connected from a vehicle body, a hydraulic cylinder attached to a bracket of each link of the working machine and driving the working machine; In a hydraulic cylinder protection device provided with a guard for protecting a hydraulic cylinder, a tube guard (4) fixed to a tube (36a) of the hydraulic cylinder (36A) and covering the tube (36a), and a hydraulic cylinder ( 36A) and the tube guard (4) in conjunction with the expansion and contraction of the rod (36b).
Slidably in the axial direction with respect to the rod
(36b) A protection device for a hydraulic cylinder, comprising: a rod guard (16) for protecting the hydraulic cylinder. 2. One end is a bottom end (36c) of a tube (36a).
The other end is attached to the rod end (36e) of the rod (36b), and the other end is attached to the rod end (36e) of the rod (36b). The protection device for a hydraulic cylinder according to claim 1, further comprising a rod guard (16) slidably mounted on (4). 3. The hydraulic cylinder according to claim 1, wherein a buffer member (4c) is interposed between the tube guard (4) and a tube (36a) of the hydraulic cylinder (36A). Protection device. 4. The hydraulic cylinder protection device according to claim 1, wherein said tube guard (4) is attached to a tube (36a) of said hydraulic cylinder (36A) by a band (7). A protection device for a hydraulic cylinder, being fixed. 5. The protection device for a hydraulic cylinder according to claim 1, wherein the rod guard is provided.
(16) is a sliding member attached to the tube guard (4).
A protection device for a hydraulic cylinder, which is slidable by engaging with (11). 6. A pair of U-shaped rails (17) attached to a rod guard (16), slidably engaged with the rails (17), and attached to the tube guard (4). Sliding member to wear
The protection device for a hydraulic cylinder according to any one of claims 1 to 5, further comprising (11). 7. A plate (4e) for attaching a sliding member attached to a cover (4b) of a tube guard (4);
7. A shim (12) for adjusting a gap between the sliding member (11) attached to (4e) and the sliding member (11).
The hydraulic cylinder protection device according to the above. 8. A plate (4g) for position adjustment attached to the cover (4b) of the tube guard (4), and the plate (4g)
A spring (43) interposed between the sliding member (11) and the sliding member (11)
The protection device for a hydraulic cylinder according to claim 5 or 6, further comprising: 9. A bolt for adjusting the position of the sliding member (11) in the left-right direction, attaching the sliding member (11) to the tube guard (4), and a slot (45a) for inserting the bolt. 7. The protection device for a hydraulic cylinder according to claim 5, further comprising: a position adjusting plate provided with the position adjustment plate. 10. A tube guard (4) is attached to a cover (4b) of the tube guard (4), and a sliding member (11, 11) is attached thereto.
A pair of left and right plates (45A, 4A) urged outward by a spring (47)
The hydraulic cylinder protection device according to claim 5 or 6, further comprising (5A). 11. The hydraulic cylinder protection device according to claim 1, wherein the cover (4b) of the tube guard (4) is detachable by a plate (5) and bolts, Guard (4) hole and plate
A hydraulic cylinder protection device characterized in that the bottom end (36c) of a tube of a hydraulic cylinder that drives a working machine with the hole of (5) is rotatably mounted on a pin (2) for mounting. 12. A tube (36a) of a hydraulic cylinder (36A).
The tube guard (4) is coaxially attached to the pin (2) for attaching the bottom end (36c), and the rod end (36e) of the rod (36b) of the hydraulic cylinder (36A) is attached at one end. 12. A rod guard (16) mounted coaxially with the pin (3) and having the other end slidably mounted on the tube guard (4). A protection device for a hydraulic cylinder according to any one of the above. 13. A cover (4) for protecting a hydraulic pipe (36f) of the hydraulic cylinder (36A) is provided on the tube guard (4).
The hydraulic cylinder protection device according to any one of claims 1 to 12, wherein f) is fixed.