JP2000212999A - Upper turning body for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve lightweight and strength, and facilitate replacement by forming the cross-section of a protection guard into a substantially triangle shape, and making an insertion hole at a predetermined side position of the triangle for the attachment hole of a protection guard. SOLUTION: A protection guard 8 comprises a guard plate 11 being triangle in cross-section, two tightening plates 12 secured to the inside thereof, a tightening plate 12b, and two plates 11a secured to both the longitudinal ends of the guard plate 11. An elliptical insertion hole is made in the vicinity of head of attaching bolt 15 in one side of the triangle cross-section of the guard plate 11. The attaching bolt 15 is inserted into the insertion hole, and a clamp can be inserted thereinto. Then, the longitudinal both ends of the guard plates 11 are clogged by securing the plates 11a. As a result, since the protection guard 8 is substantially triangle in cross-section, its high rigid triangle apex works to receive obstacles during collision therewith so that it is hard to break because flying stone and falling stones slide on the inclined side, and since it is divided into two along the longitudinal direction, its weight becomes light, and its transportation and attachment also become easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a revolving superstructure of a construction machine such as a hydraulic excavator, and more particularly, to a protective guard on a left side.
The present invention relates to an upper revolving structure of a construction machine having a side surface of a right deck.

[0002]

2. Description of the Related Art FIG. 8 shows a hydraulic shovel 20 as an example of a conventional construction machine. In the drawing, the lower traveling body 21 has a pair of traveling devices 25, 25 on the left and right sides, and the traveling devices 25, 25 are driven by a driving device (not shown) so as to be able to travel freely. An upper revolving unit 23 is mounted on a substantially upper portion of the center of the lower traveling unit 21 via a revolving bearing 22, and the upper revolving unit 23 is rotatable with respect to the lower traveling unit 21 by a revolving motor (not shown). . The upper revolving superstructure 23 is mounted on the revolving frame 1A with the work implement 3
0, machine room 26, cab 27 and counter weight 2
8 are arranged. The work machine 30 includes a boom 31 attached to the front portion of the revolving frame 1A so as to swing vertically, an arm 33 attached to the tip of the boom 31 so as to swing back and forth, and a tip of the arm 33. A bucket 35 is attached to the unit so as to be rotatable in the vertical direction, and a boom cylinder 32, an arm cylinder 34, and a bucket cylinder 36 for operating these buckets are provided. The excavator 20 excavates earth and sand, rocks, and the like by driving the driving device, the swing motor, and the hydraulic cylinders 32, 34, and 36 for each work machine.

[0003] Such a hydraulic excavator 20 is often operated in a narrow place such as a hole formed underground or a rocky area with many rocks. Therefore, the side plate forming the outermost surface of the outermost periphery of the revolving frame 1A is
It is susceptible to damage such as deformation and crushing due to collision with surrounding obstacles and flying stones when turning 3, which not only deteriorates the appearance, but also costs a lot of repairs and repairs such as parts replacement. There was a problem that it took.

For this reason, many guards for protecting the side plate forming the outermost peripheral surface of the revolving frame 1A have been conventionally proposed. For example, Japanese Utility Model Registration No. 2538203 discloses FIGS. The swing frame of the construction machine as shown in FIG.
A, hereinafter referred to as Revo Frame 1A. ) Is disclosed. FIG. 9 shows a revo frame 1A described in the publication. The revolving frame 1A includes a center frame 2 disposed at the center in the front-rear direction, and left and right decks 3A and 4 fixed to the left and right sides of the center frame 2, respectively.
A. The left and right decks 3A, 4
A is composed of a plurality of cross beams 5 extending from the center frame 2 to the left and right sides and fixed thereto, and side plates 6A and 7A connecting the outermost ends of the plurality of cross beams 5 in the front-rear direction. Have been. As shown in FIG. 10, the side plates 6A, 7A of the revo frame 1A
A resin bumper 43 for protecting the side plates 6A and 7A is attached to the outer surface of A. This resin bumper 43 has an oval cross-sectional shape, and has side plates 6A and 7A.
A is formed so as to cover the outer surface, and a through hole 44 is provided in the outer surface. Then, a bolt 45 is inserted from the outside of the resin bumper 43 through the through hole 44, and the resin bumper 43 is attached to the side plates 6A and 7A (corresponding to the side plates 6 and 7 of the present invention) with the bolt 45. ing.

Further, as another prior art of a guard for protecting the side plates 6A and 7A, for example, Japanese Patent Laid-Open No. 7-33 is disclosed.
According to No. 1699, as shown in FIG. 11, a side guard member 48 for protecting a side deck 46 (corresponding to the left and right decks 3A and 4A and the side plates 6A and 7A in FIG. 9) is provided with a screw hole. The guard frame 50 is divided into a block 49 and a long guard frame 50 extending in the front-rear direction.
And a fixing plate 52 is fixedly provided inside a guard frame 50 having a substantially U-shaped cross section, and a side guard member 48 is provided.
At the time of mounting, the block 49 with the screw hole is connected to the outer end surface portion 47 of the side deck 46 (side plate 6A,
7A), and the fastening plate 52 of the guard frame 50 is attached to the block 49 with screw holes by bolts 53.

[0006]

However, the above-mentioned prior art has the following problems. The technology disclosed in Japanese Utility Model Registration No. 2538203, and
In any of the techniques disclosed in JP-A-331699, guards are easily replaceable in order to prevent damage to the outer portion of the deck (corresponding to the side plates 6A and 7A in FIG. 9). Since the outer side surface is formed in a planar shape, there is a problem that obstacles, flying stones, and the like easily hit the planar outer surface of the guard directly, and thus are frequently damaged. Also, as shown in FIGS.
Since the insertion holes 44 and 51 for inserting the guards 5 and 53 are provided on the flat outer surface of the guard where an obstacle or the like collides, it is difficult to remove the guard if the guard is deformed or crushed. Problem. Further, if the plate thickness is increased in order to strengthen the guard, there is a problem that the weight increases, the replacement work becomes difficult, and the cost increases.

The present invention focuses on the above-mentioned conventional problems, and is lightweight and strong against collision with an obstacle or flying stones.
An object of the present invention is to provide an upper revolving structure of a construction machine provided with a low-cost protection guard that can be easily replaced.

[0008]

In order to achieve the above object, a first invention of an upper revolving structure of a construction machine according to the present invention is directed to an upper revolving structure rotatably mounted on an upper portion of a lower traveling structure. In the upper revolving structure of a construction machine having a protective guard detachably attached to the outermost peripheral portion of the revolving frame 1A, the protective guard has a substantially triangular cross section, and a mounting bolt for the protective guard is provided at a predetermined position on a side of the triangle. Is provided. According to the above configuration, since the protective guard is formed in a substantially triangular cross section, the external force is received by the highly rigid triangular apex at the time of collision with an obstacle,
Stepping stones slide down the hypotenuse of the triangle. Therefore, a protective guard which is strong and hard to be damaged, and is lightweight and inexpensive can be obtained. In addition, since the protective guard is detachably attached, it can be repaired or replaced if it is damaged, which is convenient. Furthermore, since the mounting holes for the mounting bolts are provided on the oblique sides of the triangle, obstacles do not directly hit the insertion holes, and the head of the mounting bolts is less damaged. In addition, since the distance between the insertion hole and the head of the mounting bolt is short, even if the protective guard is crushed, the position of the insertion hole is not easily displaced with respect to the head of the mounting bolt. Hard to damage. Therefore, even if the protective guard is crushed, the mounting bolt can be easily removed, and the protective guard can be easily replaced.

According to a second aspect of the present invention, in the first aspect, an insertion hole is provided at a predetermined position on an upper side of a triangular section of the protective guard. According to the above configuration, since the insertion hole is provided in the upper oblique side of the triangle, the protective guard is unlikely to damage the head of the mounting bolt even if the protective guard is significantly crushed. Therefore, even if the protection guard is greatly crushed, the mounting bolt can be easily removed, and the protection guard can be easily replaced.

According to a third aspect of the present invention, in the first aspect, the protection guard is divided into two or more and attached to at least one of the outermost peripheral side surfaces of the revolving frame. According to the third aspect of the present invention, since the protective guard is divided and attached, each protective guard is light in weight, and can be easily transported and mounted. In addition, when a part is damaged, only the part can be replaced, which is economical.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an upper swing body of a construction machine according to the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view of the revolving frame 1. FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is a top view of the protective guard 8 attached to the side plate 7 of the right deck 4. FIG. 4 is a Z view of FIG. FIG. 5 is a sectional view taken along line BB of FIG. FIG. 6 is a Y view of FIG. Figure 7 shows the protective guard 8
It is explanatory drawing of the external force which acts on and a stepping stone. First, the revolving frame 1 will be described with reference to FIGS. FIG. 1 is a perspective view of the revolving frame 1, and FIG. 2 is a sectional view taken along line AA of FIG. In these figures, the same components as those described above with reference to FIG. 8 are denoted by the same reference numerals. As shown in FIG. 1, the revo frame 1 includes a center frame 2 and left and right decks 3 and 4.
The left and right decks 3, 4 are center frame 2
And a plurality of cross beams 5 which are respectively extended outwardly and fixed from side to side, and side plates 6 and 7 which connect these outermost peripheral portions in the front-rear direction. On the outer surfaces of the side plates 6 and 7, bolt holes 9 for attaching a protective guard 8 described later in detail are provided along the longitudinal direction. As shown in FIG. 2, the bolt holes 9 are formed by fixing nuts 10 from the inside of the side plates 6 and 7 to holes 9a formed in the side plates 6 and 7.

Next, the protection guard 8 will be described with reference to FIGS. As shown in FIGS. 3 and 4, two protective guards 8, 8 are attached to the side plate 7 of the right deck 4 of the revolving frame 1 at the front and rear. The left deck 3
The side plate 6 is the same as the side plate 7, and the same applies to the following. As shown in FIGS. 4 and 5, the protective guard 8 includes a guard plate 11 having a triangular cross section, and two fastening plates 12a, 12a fixed inside the guard plate 11 having the triangular shape.
And one tightening plate 12b and the guard plate 11
, Two plates 11a fixed to both ends in the longitudinal direction of
11a. And the fastening plate 12
A sheet 13 is fixed to a and 12b, and a hole 14 is formed in the sheet 13. In this hole 14, the mounting bolt 15
Then, the protective guard 8 is attached by screwing into the bolt hole 9 of the side plate 7.

As shown in FIG. 6, an elliptical insertion hole 16 is provided in one side (here, the upper side) of the triangular cross section of the guard plate 11 near the head of the mounting bolt 15. . Through this insertion hole 16, the mounting bolt 1
5 is inserted, and a tightening tool is also inserted. Further, both ends (triangular portions) in the longitudinal direction of the guard plate 11 are closed by fixing the plate 11a.

Next, the external force and the flying stone acting on the protection guard 8 will be described with reference to FIG. Generally, hydraulic excavators 2
If 0 rotates the upper swing body 23 during work and collides with an obstacle, the external force F acts in a substantially horizontal direction. Therefore, the external force F acts on the outermost end of the protection guard 8 in the outward direction (in this case, near the vertex of the triangle of the guard plate 11). The triangular shape exerts the greatest resistance to the external force F as compared with a square shape or another polygonal shape, so that the triangular guard plate 11 is less susceptible to damage such as deformation and crushing. Also, if there is a stepping stone or a falling rock from above, the stone hits the upper side of the triangle of the guard plate 11 of the protective guard 8 and slides downward as it is.
Is not easily damaged.

According to this embodiment, since the protective guard is formed in a substantially triangular cross section, it is received at the top of the rigid triangle at the time of collision with an obstacle, and stepping stones and falling rocks slide down the hypotenuse. I do. Therefore, strength is hard to be damaged,
In addition, a lightweight and inexpensive protective guard can be manufactured. In addition, since the protective guard is detachably attached, it can be repaired or replaced when it is damaged, which is convenient. Since the mounting hole for the mounting bolt is provided on the upper oblique side of the triangle, the obstacle does not directly hit the insertion hole, and the mounting bolt head is less damaged. In addition, since the distance between the insertion hole and the head of the mounting bolt is short, even if the protective guard is largely crushed, the position of the insertion hole is hardly displaced with respect to the head of the mounting bolt, and the head of the mounting bolt is hardly damaged. Therefore, even if the protection guard is significantly crushed, the mounting bolt can be easily removed, and workability at the time of replacement of the protection guard is improved. Further, since the protective guard is attached in two parts along the longitudinal direction, it is light in weight and easy to transport and mount. In addition, when a part is damaged, only one of them can be replaced, which is economical.

[Brief description of the drawings]

FIG. 1 is a plan view of an upper swing body according to the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a plan view of a protective guard attached to a side plate of the right deck.

FIG. 4 is a Z view of FIG. 3;

FIG. 5 is a sectional view taken along the line BB of FIG. 3;

FIG. 6 is a Y view of FIG. 5;

FIG. 7 is an explanatory diagram of an external force and a flying stone acting on the protective guard.

FIG. 8 is a side view of a hydraulic excavator as an example of a construction machine.

FIG. 9 is a perspective view of a conventional upper swing body.

FIG. 10 is a diagram showing a first example of a guard for protecting a deck according to the related art.

FIG. 11 is a view showing a second example of the guard for protecting the deck.

[Explanation of symbols]

1, 1A: Revo frame, 2: Center frame, 3, 3
A: left deck, 4, 4A: right deck, 5: cross beam, 6, 6A: left side plate, 7, 7A: right side plate, 8: protective guard, 9: bolt hole, 10: nut, 11: guard Plate, 11a ... plate, 12
a, 12b: Tightening plate, 13: Sheet, 14:
Holes, 15: mounting bolts, 16: insertion holes, 20: hydraulic excavator, 21: lower traveling body, 22: revolving bearing, 23: upper revolving body, 26: machine room, 27: operator's cab 27, 28: counterweight, 30 ... Work machine, 31 ... Boom, 32 ... Boom cylinder, 33 ... Arm, 34 ... Arm cylinder,
35 ... bucket, 36 ... bucket cylinder.

Claims (3)

[Claims] 1. An upper revolving structure of a construction machine in which a protective guard is detachably attached to an outermost peripheral portion of a revolving frame 1A of an upper revolving structure which is rotatably mounted on an upper part of a lower traveling structure. An upper revolving structure for a construction machine, wherein a cross section is formed in a substantially triangular shape, and an insertion hole (16) for a mounting bolt (15) of a protective guard (8) is provided at a predetermined position on a side of the triangle. 2. An upper revolving structure for a construction machine according to claim 1, wherein said insertion hole (16) is provided at a predetermined position on an upper side of a triangular section of said protective guard (8). body. 3. The upper revolving structure of a construction machine according to claim 1, wherein the protective guard (8) is divided into two or more at least one of the outermost peripheral side surfaces of the revolving frame 1A and attached. An upper revolving structure of a construction machine, characterized in that: