JP2001115489A - Drainage structure of revolving superstructure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage structure for a revolving superstructure capable of draining water invading into a revolving superstructure by simple action using jacking up, and extremely restricting possibility of choking a drainage hole with sediment. SOLUTION: In a revolving superstructure 12 provided with a work machine 15 on the front side, a drainage hole 50 is formed on the rear side of a center frame of the revolving superstructure 12, so water stored inside the revolving superstructure is discharged outside through the hole 50 by jacking up action of the work machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draining structure for a revolving superstructure, and more particularly, to a revolving superstructure of a hydraulic excavator, which flushes water or the like entering the revolving superstructure from the rear side by jack-up operation. The present invention relates to a revolving structure drainage structure capable of easily performing the above.

[0002]

2. Description of the Related Art The construction of a hydraulic excavator includes a lower traveling body for moving and an upper revolving body provided to be able to freely swing on the traveling body. The revolving superstructure has an engine machine room, a cab, and a working machine on a main frame. The main frame includes a center frame, side frames, a tail frame, and the like. In the center frame,
The lower end (boom lower end) of the work machine is attached to the pair of brackets provided on the front side by a shaft support structure such that the lower end (boom lower end) is rotatable. This makes it possible for the bucket provided at the tip of the working machine to move up and down while drawing an arc. In order for the working machine to perform such an operation, the periphery of the mounting portion of the working machine in the center frame is not covered by the body case but is open, and the bracket and the opening are exposed to the outside.

[0003] In the above-mentioned hydraulic excavator, water may enter the bottom plate of the center frame inside the revolving superstructure due to work or the like. For example, when excavation work such as earth and sand is performed, the front part of the vehicle body of the revolving body becomes dirty with mud or the like. In this case, water enters the inside of the revolving superstructure in order to wash the front part of the revolving superstructure by washing with water. According to washing with a hydraulic excavator, water is usually sprayed from the front of the rotating body to wash mud. In addition, excavation may cause muddy water to enter the interior. In such a case as well, the inside of the revolving body is soiled, so that similar washing with water is performed.

[0004] Further, in a hydraulic excavator, rainwater sometimes enters the inside of the revolving superstructure due to precipitation in rainy weather.

Conventionally, in order to discharge water that has entered the revolving superstructure of the hydraulic excavator to the outside, for example, a conventional open-ended flatbed 7-11 is used.
As disclosed in Japanese Patent Publication No. 486, a drainage notch is formed below a support plate provided at the front end of a center frame to drain water to the front side using a slope or excavation operation.

[0006]

In a conventional hydraulic excavator, water entering a revolving structure is discharged to the outside by using a notch provided in a support plate at a front end side of a center frame of the revolving structure as in the related art. In such a case, it is necessary to make the rear part of the revolving structure higher than the front part. For that purpose, it is necessary to use a slope or an excavation operation, and drainage work is difficult. Due to the operating characteristics of the hydraulic excavator, it is not easy to make the rear part higher than the front part. In addition, providing a notch for drainage on the front side of the revolving structure was likely to cause earth and sand to be caught during excavation work, and the possibility of clogging was high. In such a case,
Drainage becomes completely impossible.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem. In consideration of the fact that a jack-up operation is easy according to a hydraulic shovel, a simple operation is used to enter the inside of a rotating body. It is an object of the present invention to provide a revolving structure drainage structure capable of draining water and having very little risk of clogging of drainage holes due to earth and sand.

[0008]

The revolving structure drainage structure according to the present invention is configured as follows to achieve the above object.

The drainage structure of the present invention is applied to a revolving structure such as a hydraulic shovel. This revolving unit is provided with a working machine including a boom, an arm, and a bucket on the front side. By operating the work machine, various works such as excavation work can be performed. The revolving superstructure includes a main frame, and a center frame is provided at a central portion of the main frame. As described above, water easily accumulates on the floor of the center frame of the revolving structure due to washing or rainwater.
The drainage structure of the present invention includes a drainage channel formed on the rear side of the center frame and a jack-up operation of the work machine. Here, the jack-up operation is an operation in which the positions of the front portions of the traveling body and the revolving superstructure are raised by pressing the bucket of the work machine against the ground with the hydraulic excavator. According to the operation of the hydraulic excavator, the jack-up operation is easily performed. Water that accumulates on the center frame in the revolving body is discharged to the outside through the drainage channel based on the jack-up operation of the work machine. At this time, if mud or dirt exists on the center frame of the revolving structure, the mud or dirt is discharged together with the water.

Various embodiments can be specifically considered for the above drainage channel. For example, although a maintenance hole is formed in the floor of the center frame, preferably, the hole may be formed at both corners of the floor on the rear side of the maintenance hole. The notion of a hole also includes a notch. Further, a partition plate is provided on the rear side of the center frame to partition between the device housing room such as an engine, and holes formed in lower corners of both sides of the partition plate can be used as the drainage passage. . Since a large hole is formed in the floor behind the partition plate, water passing through holes formed in the lower corners on both sides of the partition plate is discharged to the outside through the large hole.

[0011]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an example of a construction machine vehicle provided with a revolving structure to which the drainage structure according to the present invention is applied. This figure is
A hydraulic excavator is shown as an example of a construction machine vehicle. The hydraulic excavator 10 includes a lower traveling body 11 for performing movement.
And a revolving body 12 provided so as to freely rotate on the traveling body 11. The traveling body 11 has side frames on both sides of the traveling body frame, and a traveling crawler 11a is provided between a front wheel and a rear wheel attached to the front and rear of the side frame.
Is provided. The revolving superstructure 12 includes an engine machine room 13, a driver's cab 14, and a work machine 15. Work machine 1
Reference numeral 5 denotes a boom, an arm 17, a bucket 18, and telescopic hydraulic cylinders 16a, 17a, 18a for moving the boom 16, the arm 17, and the bucket 18, respectively. The boom 16, the arm 17, and the bucket 18 are individually operated by corresponding hydraulic cylinders, and work operations such as excavation are performed. Work machine 1
5, that is, the lower end of the boom 16,
Is supported between a pair of bracket portions 21 provided on the front upper side of the main frame 20. The lower end of the boom hydraulic cylinder 16 a is supported by a pair of brackets 22 provided on the lower front part of the main frame 20. The hydraulic cylinders 16 a are provided on both sides of the boom 16. The upper end of the hydraulic cylinder 16a is connected to a substantially middle portion of the boom 16. By extending the entire length of the hydraulic cylinder 16a, the boom 16 can move upward, and can be moved downward by reducing the overall length. Due to such movement of the boom 16, the bucket 18 moves up and down while drawing an arc. In the engine machine room 13 of the revolving unit 12, an engine 19 is mounted at a rear position. In FIG. 1, reference numeral 23 denotes a turning device for turning the turning body 12. In FIG. 1, the front portion of the main frame 20 of the work machine 15 is actually hidden by a portion shown by a broken line 24 when viewed from the right side of the excavator 10 and cannot be seen.

In the hydraulic excavator 10 described above, the work machine 1
By actuating 5, the jack-up operation can be performed. The jack-up operation refers to the boom 16
The work machine 15 including the arm 17 and the bucket 18 is bent at each joint and moved downward to bring the bucket 18 into contact with the ground, and in this state, the entire work machine 15 is operated to move further downward. Since the operation of the work machine 15 is restricted by the ground, as a result, the traveling body 11 and the revolving
Is raised, and the position of the front part is higher than the position of the rear part. In the hydraulic excavator 10, such a jack-up operation can be easily performed on flat ground.

FIGS. 2 to 5 show the main frame 20 of the swing body 12. 2 is a plan view, FIG. 3 is a view taken along the line AA in FIG. 2, FIG. 4 is a perspective view seen from the rear right side, and FIG. 5 is a perspective view of a main part of the drainage structure. In this embodiment, the revolving structure drainage structure is provided on the bottom plate of the center frame of the main frame 20.

The main frame 20 forming the frame structure of the revolving unit 12 has a center frame 31 located at the center.
A plurality of overhanging frames 32 fixed to the left and right sides of the center frame 31 and protruding in the left-right direction, and side frames 33 and 34 fixed to the front end side of each overhanging frame 32 and arranged in the front-rear direction. And a tail frame 35. The overhang frame 32 located on the left side of the center frame 31 is formed longer than the overhang frame 32 on the right side, and together with the side frame 33,
The driver cab 14 is supported. The center frame 31 includes a bottom plate 36 that constitutes a connection portion with the above-mentioned turning device (including a center joint, a turning bearing, and a turning drive device) 23, and a left and right standing upright on the bottom plate 36 and extending in the front-rear direction. It consists of a pair of beams 37. The bottom plate 36 forms the floor of the center frame 31. Each of the left and right beams 37 is a bottom plate 3
6, a beam plate 37a provided perpendicular to the
7a is formed by an upper flange 37b in the form of a narrow and long plate joined along the upper edge. The rear portion of the beam plate 37 is an I-beam having an I-shaped cross section, and has a high intensity. In the front part of the center frame 31, the upper front part of the beam plate 37a in the left and right beams 37 is the above-mentioned bracket part 21 for mounting the lower end of the boom 16, and the lower front part of the beam plate 37a is for mounting the hydraulic cylinder 16a. It becomes the above-mentioned bracket part 22. A pin 38 is provided between the bracket portions 21 of the beam plates 37a of the left and right beams 37.
The work machine 15 is connected by the.

The bottom plate 36 of the center frame 31 is formed of a flat plate. In the bottom plate 36 of the center frame 31, between the left and right beam plates 37a and on the front side 36a, a mounting hole 39 for providing a turning drive and a mounting hole 4 for arranging a center joint are provided.
0 is formed, a hole 41 for maintenance is formed in a substantially central portion 36b, and a relatively large hole 42 is formed in a portion 36c corresponding to the rear engine room. The part where the hole 41 for maintenance is formed and the part where the engine room where the hole 42 is formed are formed are partitioned by a partition plate 43. A support plate 44 is provided between the left and right beam plates 37a on the front side of the center frame 31. An opening 44a is formed in the lower center of the support plate 44.

In FIG. 2, reference numeral 45 shown by an alternate long and short dash line indicates an arrangement position of the turning device 23 described above. Also, in FIG. 2, the front side of the upper flange 37b provided along the upper edge of the beam plate 37a in the beam 37 is omitted, and as a result, the beam plate 37a is illustrated in the omitted portion. . Further, reference numeral 46 in FIG. 4 denotes an internal gear on the traveling body side in a swing bearing included in the swing device 23.

In the above-described main frame 20 of the revolving unit 12, the drainage structure according to the present embodiment is configured such that the bottom plate 36 of the center frame 31 has a location 36b.
Two holes (or notches) 50 are formed at the corners on both sides in front of the partition plate 43 behind the maintenance hole 41. The hole 50 is a drain hole formed in the bottom plate 36. For example, when water enters from the opening 44a of the support plate 44 of the center frame 31 and the jack-up operation as described above is performed, the water moves rearward on the bottom plate 36 of the center frame 31 and moves downward from the hole 50. Will be discharged to

FIG. 6 shows another embodiment of the drainage structure according to the present invention. This figure is a sectional view taken along line BB in FIG. Elements that are substantially the same as the elements described in the above embodiments are given the same reference numerals. In this embodiment, the drainage structure is realized by forming holes (notches) 51 at the corners on both sides of the lower edge of the partition plate 43 as holes for drainage. According to this drainage structure, water is passed through the hole 51 by the jack-up operation to the point 3 on the bottom plate 36.
6c, and the water is discharged to the outside through the large hole 42.

In the above configuration, when a partition plate is provided between the front location 36a and the central location 36b on the bottom plate 36, the hole 50 is provided in front of the partition plate.
A hole equivalent to the hole 51 can be formed on both sides of the lower edge of the partition plate.

[0021]

As is apparent from the above description, according to the present invention, in the center frame of a revolving structure such as a hydraulic shovel or the like, the corners at both ends of the floor in front of the partition plate or at both ends of the lower edge of the partition plate are provided. A drain hole is provided so that the water that has entered the revolving structure can be easily discharged to the outside by combining this with the jack-up operation, and mud and dirt can be easily discharged together with the water. Work has become easier. In addition, there is an effect that the possibility of clogging of the drain hole due to soil and the like is extremely small.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a construction machine vehicle equipped with a revolving structure to which a drainage structure according to the present invention is applied.

FIG. 2 is a plan view of a main frame of the swing body.

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

FIG. 4 is a perspective view of the main frame as viewed from the rear left.

FIG. 5 is a partially enlarged perspective view showing a main part of a drainage structure.

FIG. 6 is a sectional view taken along line BB in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Hydraulic excavator 11 Traveling body 12 Revolving body 14 Operator's cab 15 Work machine 20 Main frame 31 Center frame 43 Partition plate 50, 51 Drainage hole

Claims (3)

[Claims] In a revolving structure having a working machine on a front side, a drainage channel is formed on a rear side of a center frame of the revolving structure, and water accumulated in the revolving structure is jacked up by the working machine. A revolving structure drainage structure, characterized in that the revolving body is discharged to the outside through the drainage channel. 2. The drainage channel according to claim 1, wherein the drainage channel is a hole formed at a corner on both sides of the floor behind the maintenance hole formed in the floor of the center frame. Revolving structure drainage structure. 3. The revolving unit according to claim 1, wherein the drainage channel is a hole formed at a lower corner on both sides of a device storage room partition plate provided on a rear side of the center frame. Drainage structure.