JP2001279722A - Counter weight of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the maintenance inspection working of the instrument of the inside of the room of the engine of a construction machine. SOLUTION: Windows 13, 14 are provided on the rear face center and the right and left sides of the counter weight 12 of the construction machine, and the maintenance inspection of the engine or the like is performed through a three-way window. After inspection, window covers 16, 17 are mounted on a window to be shielded. The window cover attaches spring lip plate on the rear face, fixed by engaging the lip plate with the groove of the circumference of the window and are easy to attach and detach.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterweight for a construction machine, and more particularly to a counterweight for facilitating maintenance and inspection of an engine of a construction machine and peripheral accessories.

[0002]

2. Description of the Related Art Construction machines, such as shovel cars and cranes, have counterweights attached to the back of a main body for balancing during lifting. Both sides are shielded by the counterweight. Therefore, maintenance and inspection of the engine and accessories in the engine room are performed from above and below the machine room, and there is a problem that maintainability is poor.

[0003] In particular, in a small construction machine requiring a small turning radius, in order to reduce the amount of rearward projection of the counterweight as much as possible and to secure sufficient stability, the counterweight is relatively moved. As a result, the gap between the engine, auxiliary equipment, etc. and the counterweight becomes narrower,
In many cases, it is necessary to remove the counterweight from the construction machine for maintenance and inspection of the engine and the like, and the maintenance and inspection work requires a lot of time and labor.

[0004] As a proposal for improving the workability of maintenance and inspection, a window is formed on the back surface of the counterweight, and a cover that can be opened and closed on the window is hinged or bolted. A counterweight or the like provided with a notch so that it can be inserted has been proposed.

[0005]

A counterweight in which a cover is attached to a window formed on the backside of the counterweight by a hinge or a bolt enables inspection and maintenance of equipment in the engine room from the rear side of the construction machine. Since the left and right sides are closed, there are places where inspection and maintenance are not possible, and there is room for improvement in maintainability.

[0006] Further, the notch formed counterweight has a greater reduction in strength than the notched window. For example, when the counterweight interferes with an obstacle during turning of the construction machine, cracking or chipping occurs. There is a problem that it is easy.

[0007] Therefore, there arises a technical problem to be solved in order to further improve the maintainability without reducing the strength of the counterweight, and an object of the present invention is to solve the above problem.

[0008]

SUMMARY OF THE INVENTION The present invention proposes a counterweight mounted on the back of an engine room of a construction machine, wherein the counterweight is mounted on the back of the engine room of the construction machine. A counterweight for construction machinery, characterized in that a window that leads to the engine room is formed on the front and rear surfaces, and that maintenance and inspection of the engine room can be performed from the outside through the window, and a removable window cover is attached to each window. Is provided.

[0009] A spring rib plate is attached to the left or right edge or upper and lower edge of the back surface of the window cover, and a groove is formed around the window of the counterweight to form a mating pair with the rib plate of the window cover. Another object of the present invention is to provide a counterweight of a construction machine in which a window cover can be freely attached to and removed from the counterweight.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIGS. 1 and 2 show a power shovel 1 as an example of a construction machine, in which an upper revolving structure 3 is mounted on a lower traveling structure 2. The lower traveling body 2 is provided with crawler traveling devices 4 on the left and right sides, and travels by driving the crawler 6 by the driving wheels 5 at the rear. The upper swing body 3 is provided with a digging device including a boom 7, an arm 8, and a bucket 9, and a driver's cab 10 is disposed on the left side of the front part.

A rear portion of the upper revolving unit 3 is an engine room 11 in which an engine, accessories such as an alternator and a radiator, a hydraulic pump, and the like are arranged. Is installed.

The planer shape of the counterweight 12 is such that the back surface is an arc-shaped curved surface centered on the turning center of the upper revolving unit 3, and the counterweight 12 interferes with surrounding objects when the upper revolving unit 3 turns. The risk of doing so is reduced. The counterweight 12 is provided with windows 13, 14, 15 at the center of the back and right and left sides to facilitate maintenance and inspection of the engine and the like in the engine room 11.
Window covers 16, 17, 18 are attached to 4, 15, respectively.

FIG. 3 is a cross-sectional view of the left and right central portions of the counterweight 12, and a shallow recess 19 having substantially the same dimensions as the window cover 17 is formed around a window 14 passing through the left and right centers of the back surface. Since the window cover 17 is housed in the recess 19 and the surface of the window cover 17 is configured to be continuous with the surface of the counterweight 12, the window cover 17 does not protrude above the surface of the counterweight 12. There is no loss.

FIG. 4 shows the back surface of the window cover 17. The sound absorbing material 20 is adhered to the back surface of the R-shaped rectangular window cover 17 except for both right and left ends. Is affixed. The cushion member 21 elastically contacts the peripheral portion of the window 14 of the counterweight 12 to prevent sound leakage and protect the edge of the sound absorbing material 20.

In the vicinity of the left and right ends on the back surface of the window cover 17,
A spring rib plate 22 having a length extending from the upper end to the lower end is welded. As shown in FIG. 3, the rib plate 22 has a C-shaped cross section, and at least one of the rib plates (upper side in FIG. 3) is attached in such a manner that its tip end is slightly inclined toward the center of the window cover 17. . A groove 23 corresponding to the rib plate 22 of the window cover 17 is formed in the concave portion 19 of the counterweight 12, and the groove 23 and the rib plate 22 form a fitting pair. Although not shown, the windows 13 and 15 and the left and right window covers 16 and 18 on the left and right sides of the counterweight 12 have the same configuration as the rear window 14 and the window cover 17 described above.

When the window covers 16, 17, 18 are mounted on the windows 13, 14, 15 of the counterweight 12, the window covers 16, 17, 18 are fitted with the recesses 19 of the windows 13, 14, 15 respectively.
When the window covers 16, 17, 18 are pushed in the depth direction, the rib plate 22 is fitted into the groove 23, and the rib plate 22 elastically contacts the inner wall of the groove 23, and the window cover 16, 17, 18 is pressed. 18 is fixed. At this time, if the left rib plate 22 (lower side in FIG. 3) is inserted into the groove 22 first, and then the right side of the window cover is pushed inward to fit the right rib plate 22 into the groove 23, the Window covers 16, 17, and 18 can be attached to the vehicle.

When the window covers 16, 17, 18 are to be removed from the counterweight 12 for maintenance and inspection inside the engine room 11, the left or right end of the window covers 16, 17, 18 can be pulled by hand. The plate 22 comes off the groove 23, and the window covers 16, 17, 18 can be easily attached and detached.

The present invention is not limited to the above-described embodiment, and various modifications are possible within the technical scope of the present invention, and it is natural that the present invention extends to those modifications. is there.

[0019]

As described above, since the counterweight of the construction machine according to the present invention has windows on the rear surface and on both right and left sides, maintenance and inspection of the equipment in the engine room can be easily performed and notches are provided. The strength is higher than that of the provided counterweight, and the possibility of cracking or chipping is eliminated.

Further, by configuring the window cover to be fitted to the window using the spring rib plate, the number of parts is reduced as compared with the conventional bolt fixed type window cover and the hinge type window cover. Cost is reduced, and the aesthetic appearance is improved because bolts and hinges are not exposed on the surface.

[Brief description of the drawings]

FIG. 1 is a side view of a construction machine according to an embodiment of the present invention.

FIG. 2 is a rear view of the construction machine shown in FIG. 1;

FIG. 3 is a horizontal sectional view of a central portion of a counterweight.

FIG. 4 is a rear view of the window cover of the counterweight.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 power shovel 10 cab 11 engine room 12 counter weight 13, 14, 15 window 16, 17, 18 window cover 19 recess 20 sound absorbing material 21 cushion material 22 rib plate 23 groove

Claims (2)

[Claims] 1. A counterweight mounted on the back of an engine room of a construction machine, wherein windows are formed on the back of the counterweight and on both left and right sides thereof to access the engine room. And a detachable window cover attached to each window. 2. A resilient rib plate is attached to the left and right edges or upper and lower edges of the back surface of the window cover, and a groove is formed around the window of the counterweight so as to form a mating pair with the rib plate of the window cover. 2. The counterweight of a construction machine according to claim 1, wherein the window cover is freely fitted and detachable from the counterweight.