JP2000291066A - Cap for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relax a colliding force generated when rock collides with a front window through a front surface guard at the time of drilling rock or the like, and to enhance a front window protective function by the front surface guard. SOLUTION: A front surface guard 22 is detachably attached to a front surface 8B of a cab box 8 constituting a cab 21. The front surface guard 22 is made up of an almost rectangular support frame 23, a plurality of front guard rods 24 arranged on the front surface of the support frame 23, and a plurality of rear guard rods 25 arranged on the rear surface of the support frame 23. The rear guard rods 25 are alternately arranged with respect to the front guard rods 24 in rightward and leftward directions. Thus, when a small piece of rock flies toward the front surface guard 22 in an orthogonal direction or the like, at the time of drilling rock, the rock collides with both the front guard rod 24 and the rear guard rod 25, to thereby reduce energy of movement of the rock.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab for a construction machine provided on a construction machine such as a hydraulic shovel.
More particularly, the present invention relates to a cab for a construction machine including a front guard for protecting a front window from impact materials such as earth and sand, rocks, and the like.

[0002]

2. Description of the Related Art FIGS. 6 to 9 show an example in which a cab for a construction machine according to the prior art is applied to a hydraulic excavator.

In the drawing, reference numeral 1 denotes a lower traveling body, 2 denotes an upper revolving body mounted on the lower traveling body 1 so as to be pivotable, and the upper revolving body 2 comprises a revolving frame 3 and a left front of the revolving frame 3. A cab 4 for a hydraulic excavator provided on the side of the vehicle, a building cover 5 disposed on the revolving frame 3 at a rear side of the cab 4 and defining a machine room, and provided on a rear portion of the revolving frame 3. It is generally constituted by a counter weight 6 and the like.

[0004] A working device 7 for rock drilling or the like is provided on the front side of the upper revolving unit 2 so as to be able to move up and down as described later.
, An arm 7B provided on the distal end side of the boom 7A, and a bucket 7C provided on the distal end side of the arm 7B. And
The boom 7A, the arm 7B, and the bucket 7C are rotated by actuators such as a boom cylinder 7D, an arm cylinder 7E, and a bucket cylinder 7F.

[0005] Reference numeral 8 denotes a cab box constituting an outer shell of the cab 4, and the cab box 8 includes a ceiling part 8A, a front part 8B, a rear part 8C, and left and right side parts 8 as shown in FIG.
D, 8E and the like. On the front surface 8B of the cab box 8, screw seats 8F, 8F,... Are fixedly provided at upper and lower positions on both left and right ends, respectively. This is for attaching a front guard 11 to be described later.

Reference numeral 9 denotes an upper front window provided on the front portion 8B of the cab box 8, and reference numeral 10 denotes a lower front window provided below the front window 9 and provided on the front portion 8B of the cab box 8. The front windows 9 and 10 are made of a transparent glass plate or the like, and secure a front view from inside the cab 4.

Reference numeral 11 denotes a front guard provided on the front portion 8B of the cab box 8 at the front side of the front window 9, and has a substantially L-shaped cross section. A substantially rectangular support frame 12 extending along
2 and a guard rod 13 to be described later provided in the apparatus 2.

As shown in FIGS. 7 and 8, the support frame 12 is located above the front window 9 and extends leftward and rightward, and a left side of the upper frame 12A. A left frame portion 12B extending downward from the end, a right frame portion 12C extending downward from the right end of the upper frame portion 12A, and a lower end of the right frame portion 12C and a lower end of the left frame portion 12B. The lower frame 12D is connected to the left and right directions.

On the left frame portion 12B and the right frame portion 12C of the support frame 12, four mounting brackets 12E are fixedly provided so as to be separated upward and downward, respectively. Screw seat 8F. Thereby, the support frame 12 is detachably attached to the front surface portion 8B of the cab box 8, and each guard rod 1
3 support members.

Reference numerals 13, 13,... Denote a plurality of guard rods provided on the support frame 12. Each of the guard rods 13 is composed of a prism (square plate) which is elongated in the upward and downward directions. They are arranged at substantially equal intervals in the direction. The guard bar 13 is disposed so as to protrude forward from the support frame 12, and its rear end is integrally fixed to the front side of the upper frame 12A and the front side of the lower frame 12D of the support frame 12 by welding. ing. The guard bar 13 is configured to protect the front window 9 from impacts such as rocks scattered from the front toward the cab 4.

The hydraulic shovel according to the prior art constructed as described above operates a working device 7 at a rock crushing site, for example, as shown in FIG.
Rock drilling work is performed by rotating.

At the time of such rock drilling work, rocks may be scattered toward the cab 4 from the direction of the arrow shown in FIG. Therefore, in this prior art, the front window 9 of the cab 4 is covered from the outside by the front guard 11, and the front window 9 is protected from the rocks and the like.

[0013]

In the above-mentioned hydraulic shovel according to the prior art, the rock scattered on the cab 4 side during rock drilling work is smaller than the distance between the guard rods 13 of the front guard 11. If these are also large, the front window 9 can be protected to some extent from the rock by these guard rods 13.

Further, even when the rock is smaller than the distance between the guard rods 13, for example, arrows A and A shown in FIG.
When the rock scatters in an oblique direction as indicated by A ', the rock can be hit against the front window 9 as indicated by arrows B and B' in a state where the rock once collides with the side surface of the guard rod 13. It is possible to reduce the kinetic energy of the rock to some extent by the impact force.

However, even if the rock collides with the guard rod 13 as described above, if the rock has a large kinetic energy, the rock may strongly hit the front window 9 and damage the front window 9. There is a problem.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can efficiently reduce the kinetic energy of a rock when the rock collides with a front guard during rock drilling work or the like. It is an object of the present invention to provide a cab for a construction machine that can reduce a collision force when a rock passes through a front guard and hits a front window, and can enhance a protection function of the front window by the front guard.

[0017]

According to a first aspect of the present invention, there is provided a cab for a construction machine comprising a cab box having a ceiling, a front, a rear, and left and right side portions. A front window provided on a front portion of the cab box, and a front guard provided on a front portion of the cab box to protect the front window from an external impact.

The first aspect of the present invention is characterized in that the front guard includes a support member provided on a front portion of the cab box, and a plurality of front guard bars provided at intervals on the support member. And a plurality of rear guard bars provided on the support member so as to be located behind the front guard bars and to be alternated with the front guard bars.

With this construction, for example, when rocks or the like are scattered obliquely from the front toward the cab during rock drilling work, the rocks are first provided on the support member of the front guard. The rod can collide with the rod, and the collision can reduce the kinetic energy of the rock.

Since a plurality of rear guard rods are arranged at a position behind the front guard rods at positions alternate with the front guard rods, the rock collides with the front guard rods as described above. Later, the rock can further collide with the rear guard rod, and the collision can further reduce the kinetic energy of the rock and reduce the collision force when the rock hits the front window.

According to a second aspect of the present invention, the support member is formed of a frame extending along the outer edge of the front window, each front guard bar is provided on the front side of the frame, and each rear guard bar is provided with the front guard bar. It is configured to be provided on the rear side of the frame.

Thus, the front guard rod and the rear guard rod can be fixed along the front side and the rear side of the frame.
The mounting strength of the front guard bar and the rear guard bar to the frame body can be increased.

Further, the invention according to claim 3 is configured such that the front and rear guard bars extend upward and downward and are arranged alternately in left and right directions.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction machine cab according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings, taking an example in which the cab is applied to a hydraulic shovel. In the present embodiment, the same components as those of the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

FIGS. 1 to 3 show a first embodiment of the present invention. In the drawings, reference numeral 21 denotes a cab used in the present embodiment. Cab box 8, front windows 9, 10
And a front guard 22 described later.

Reference numeral 22 denotes a front guard provided on the front portion 8B of the cab box 8 and used in the present embodiment. The front guard 22 has a substantially rectangular frame like the front guard 11 according to the prior art. And a support frame 23 as a support member detachably fixed to the front surface portion 8B of the cab box 8B, and a front guard rod 24 and a rear guard rod 25 described later.

The support frame 23 includes an upper frame 23A, a left frame 23B, a right frame 23C, and a lower frame 23D. Four mounting frames are mounted on the left frame 23B and the right frame 23C. The bracket 23E is fixed. In the front guard 22, the mounting brackets 23E are fastened to the screw seats 8F of the cab box 8, respectively.

Reference numerals 24, 24,... Denote a plurality of front guard bars which are integrally provided on the front side of the support frame 23 so as to be separated from each other in the left and right directions. In the same manner as 13, it is formed as a prismatic body (plate-like body) that is elongated in the upward and downward directions. These front guard bars 24 are attached to the left frame portion 23B of the support frame 23.
And the right frame portion 23C are arranged at substantially equal intervals along the left and right directions.

The front guard bar 24 is disposed so as to protrude forward from the support frame 23, and the upper and lower ends of its rear end are fixed to the upper frame portion 23A and the lower frame portion 23D of the support frame 23 by welding. ing.

Reference numerals 25, 25,... Denote a plurality of rear guard bars integrally provided on the rear surface side of the support frame 23 so as to be separated from each other in the left and right directions. It is formed as a prismatic body (plate-like body) that is elongated in the upper and lower directions almost in the same manner as in the above.

Here, the rear guard bar 25 is located rearward of the front guard bar 24, and
B and the right frame 23C are arranged at substantially equal intervals along the left and right directions. The rear guard bars 25 are alternately arranged in the left and right directions with respect to the front guard bars 24.

The rear guard bar 25 is supported by the support frame 2.
The upper and lower ends of the support frame 23 are fixed to the upper frame 23A and the lower frame 23D of the support frame 23 by welding.

The hydraulic shovel according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

However, in this embodiment, the front guard 2
2 of the front guard rod 24 and the rear guard rod 25
3 is arranged at alternate positions along the left and right directions, so that the collision of rocks during rock drilling can be mitigated, and the protection function of the front window 9 by the front guard 22 can be greatly enhanced. it can.

That is, as shown in FIG.
When a rock smaller than the distance S between the rear guard rod 25 and the rear guard rod 25 scatters obliquely from the front toward the cab 21 in the directions indicated by arrows A and A ′ in FIG. First, the front guard rod 24 is caused to collide, and at this time, the kinetic energy of the rock is converted into thermal energy, and the kinetic energy can be reduced.

Then, as described above, the rock is formed by the front guard rod 2.
After colliding with No. 4, this rock is shown by arrow B in FIG.
It can be bounced back like B 'and can also collide with the rear guard rod 25. At this time, the kinetic energy of the rock can be converted into thermal energy, and the kinetic energy can be further reduced.

Therefore, according to the present embodiment, the collision force when the rock hits the front window 9 can be remarkably reduced as compared with the prior art, and the durability and life of the front window 9 can be increased. Further, the front guard rod 24 and the rear guard rod 25 are formed of a rectangular plate-like body, and the front guard rod 24 and the rear guard rod 25 are configured to project forward and rearward from the support frame 23, respectively. From this, it is possible to increase the probability of rock collision with the front guard rod 24 and the rear guard rod 25,
Thereby, the collision force when the rock collides with the front window 9 can be further reduced, and the protection function of the front window 9 can be further enhanced.

Furthermore, since the front guard rod 24 and the rear guard rod 25 are arranged so as to be shifted frontward and rearward, the bending rigidity and the like of the entire front guard 22 can be increased as compared with the prior art. The durability and the like of the front guard 22 can be improved.

FIGS. 4 and 5 show a second embodiment. The feature of this embodiment is that the front guard bar and the rear guard bar constituting the front guard are formed as cylindrical bodies, respectively. It is in.

In the drawing, reference numeral 31 denotes a cab used in the present embodiment.
The cab box 8, the front windows 9 and 10, and a front guard 32 described later are provided in substantially the same manner as in FIG.

Reference numeral 32 denotes a front guard provided on the front portion 8B of the cab box 8 and used in the present embodiment. The front guard 32 is a front guard 2 according to the first embodiment.
2, a substantially rectangular support frame 33 as a support member, and a front guard rod 34 and a rear guard rod 35 described later.
And is constituted by. The support frame 33 includes an upper frame 33A, a left frame 33B, a right frame 33C, and a lower frame 3
3D, and has each mounting bracket 33E.

Reference numerals 34, 34, ... denote a plurality of front guard rods provided on the front side of the support frame 33 and used in the present embodiment.
The front guard rod 34 is formed as a columnar body that is elongated in the upward and downward directions, and is arranged at substantially equal intervals in the left and right directions. The upper and lower ends of the front guard rod 34 are bent into a substantially L-shape to form the upper frame 3 of the support frame 33.
3A and the lower frame portion 33D are fixed by welding.

Are a plurality of rear guard rods provided on the rear side of the support frame 33 and used in the present embodiment.
Similarly to the front guard rod 34, the rear guard rod 35 is formed as a columnar body that is elongated in the upward and downward directions, and is arranged at substantially equal intervals in the left and right directions.

The rear guard bar 35 is
The upper and lower ends of the support frame 33 are bent in a substantially L-shape while being disposed at positions alternated with the front guard rods 34 in the left and right directions, respectively. Each is fixed to the portion 33D by welding.

Thus, also in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the first embodiment. In particular, in the present embodiment, since the front guard rod 34 and the rear guard rod 35 are each formed as a columnar body, the clearance between the front guard rods 34 and the gap between the rear guard rods 35 from inside the cab 4. The view ahead can be expanded.

In each of the embodiments, the support frame is described as being formed in a substantially rectangular shape. Alternatively, the support frame may be formed in another shape such as an elliptical shape, an oval shape, or a pentagonal shape. Is also good.

Further, in each embodiment, the cab is described as being used for a hydraulic excavator. However, the present invention is not limited to this, and may be used for other construction machines such as a hydraulic crane and a bulldozer.

[0048]

As described above in detail, according to the first aspect of the present invention, the front guard has a plurality of front guard bars on the support member, and the support member has a rear guard bar on the rear side. Because the rear guard rods are arranged so as to be alternated with the front guard rods, for example, when rocks or the like are scattered obliquely from the front toward the cab during rock drilling work, The rock collides with both the front guard rod and the rear guard rod, the kinetic energy of the rock can be reduced, and the protection function of the front window by the front guard can be greatly enhanced.

According to the second aspect of the present invention, each front guard bar is provided on the front side of the frame, and each rear guard bar is provided on the rear side of the frame. The rod can be fixed along the front side and the rear side of the frame, and the mounting strength of the front guard bar and the rear guard bar to the frame can be increased to improve the durability of the front guard as a whole. it can.

Further, according to the third aspect of the present invention, the front and rear guard rods extend upward and downward and are arranged alternately in the left and right directions.
It is possible to efficiently collide with the rear guard bar, and the protection function of the front window can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a front guard of a hydraulic shovel according to a first embodiment of the present invention together with a cab.

FIG. 2 is a front view showing a front guard in FIG. 1 together with a cab.

FIG. 3 is an enlarged sectional view as seen from the direction of arrows III-III in FIG. 2;

FIG. 4 is a partial perspective view showing a front guard of a hydraulic excavator according to a second embodiment of the present invention together with a cab.

FIG. 5 is an enlarged cross-sectional view as viewed from a direction indicated by arrows VV in FIG. 4;

FIG. 6 is an external view showing a conventional hydraulic excavator.

FIG. 7 is an enlarged perspective view showing a front guard in FIG. 6 together with a cab.

FIG. 8 is a front view showing a front guard in FIG. 7 together with a cab.

9 is a partially enlarged cross-sectional view as seen from the direction of arrows IX-IX in FIG.

[Explanation of symbols]

 Reference Signs List 8 Cab box 8A Ceiling part 8B Front part 8C Rear part 8D, 8E Side part 9,10 Front window 21,31 Cab 22,32 Front guard 23,33 Support frame (support member) 24,34 Front guard rod 25,35 Rear Side guard rod

Claims (3)

[Claims] 1. A cab box comprising a ceiling portion, a front portion, a rear portion, and left and right side portions, a front window provided on a front portion of the cab box, and a front window provided from an external impact object. For protection, a cab for construction equipment comprising a front guard provided on a front portion of the cab box, wherein the front guard includes a support member provided on a front portion of the cab box, and a support member provided on a front portion of the cab box. A plurality of front guard bars provided at intervals, and a plurality of rear guard bars provided on the support member so as to be located behind the respective front guard bars and alternate with the front guard bars. A cab for construction machinery characterized by comprising: 2. The support member comprises a frame extending along the outer edge of the front window, each of the front guard bars is provided on the front side of the frame, and each of the rear guard bars is provided on the front of the frame. The cab for a construction machine according to claim 1, which is provided on a rear surface side. 3. The cab for a construction machine according to claim 1, wherein the front and rear guard rods extend upward and downward and are arranged alternately in left and right directions.