JP2000352071A - Swiveling construction machine - Google Patents

Abstract

(57) [Problem] To improve workability by easily performing inspection work of a pilot filter and replacement work of a filter element. SOLUTION: A pilot filter 25 is arranged at a front side of a control valve unit 18 and almost at the forefront of a turning frame 3. Thus, by opening the right cover, the pilot filter 25 can be visually observed from the outside, and daily inspection work can be easily performed. Also, by disposing the pilot filter 25 at the forefront of the revolving frame 3, the distance from the front end of the upper revolving unit to the pilot filter 25 can be reduced. Work can be performed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing type construction machine such as a hydraulic shovel, and more particularly to a swing type construction machine provided with a pilot filter for purifying hydraulic oil supplied from a pilot pump to a control valve unit. .

[0002]

2. Description of the Related Art In general, as a swing type construction machine, for example, a hydraulic shovel or the like is known. This hydraulic shovel includes a lower traveling body and an upper revolving body which is rotatably mounted on the lower traveling body. A working device is provided on the front side of the upper revolving unit so as to be able to move up and down.

[0003] The upper revolving superstructure includes a revolving frame, a counterweight mounted on the rear side of the revolving frame, an engine mounted on the revolving frame positioned in front of the counterweight, and an engine mounted on the revolving frame. The main pump and the pilot pump are mounted and a control valve unit is provided at a front side of the engine and connected to the main pump and the pilot pump.

In addition, a hydraulic shovel is provided in a hydraulic oil tank or the like for preventing foreign matter from being mixed into pressure oil for driving an actuator or the like provided in a working device or pilot pressure oil for driving a control valve unit or the like. Is provided with a filter. In particular, the pilot pressure oil that drives the control valve unit drives the spool that slides in the spool sliding hole with a small gap. Therefore, even if minute foreign matter just enters the pilot pressure oil, the spool or spool slides. There is a possibility that the sliding surface such as the moving hole may be damaged.

Therefore, the hydraulic excavator cleans the pressure oil supplied from the pilot pump by the filter element in the middle of the pipe between the pilot pump and the control valve unit separately from the filter in the hydraulic oil tank. A pilot filter is provided.

Here, the periphery of the pilot filter is crowded by a pilot pump, a hydraulic hose extending from a control valve unit, various hydraulic devices, and the like. For this reason, when replacing the filter element, there is a problem that it is difficult to handle a tool such as a socket wrench used at the time of replacement, and the workability is poor.

Therefore, there is known a hydraulic shovel according to the prior art that allows the filter element of a pilot filter to be easily replaced (for example, Japanese Patent Application Laid-Open No. 10-1974).

The prior art hydraulic shovel has a structure in which a mounting wall is erected on the rear side of a hydraulic oil tank near a hydraulic pump mounted on an engine and located in a machine room, and a pilot filter is mounted on the mounting wall. It has become. An opening through which the filter element is inserted when the filter element is attached to or detached from the pilot filter is formed in the bottom plate of the revolving frame located below the pilot filter.

According to the hydraulic excavator of the prior art configured as described above, when replacing the filter element, a socket wrench is inserted through the opening from the lower side of the revolving frame, and the socket wrench covers the filter element. The filter element can be easily replaced (removed) by engaging the case and rotating the case.

[0010]

In the hydraulic shovel according to the prior art described above, a pilot filter is disposed on a mounting wall provided on the rear side of a hydraulic oil tank near a hydraulic pump. However, in the vicinity of the hydraulic pump and the hydraulic oil tank, a large number of hydraulic hoses and hydraulic devices extending to the hydraulic pump, a pressure reducing pilot valve in the cab, a plurality of hydraulic cylinders, a swing motor, a traveling motor, and the like are arranged. Therefore, the area around the pilot filter becomes very crowded. For this reason, even if the door provided on the building cover that covers the engine, the pump, the control valve unit, and the like is opened, it is difficult to visually check the pilot filter from the outside, and daily inspection work can be performed unless the pilot filter is looked into. There is a problem that can not be.

A pilot filter disposed near the hydraulic pump and on the rear side of the hydraulic oil tank is disposed at a position far from the periphery of the upper revolving unit by a counterweight or a revolving frame. For this reason, when replacing the filter element of the pilot filter, the socket wrench cannot be easily engaged with the pilot filter, and there is a problem that the replacement workability is poor.

In addition, when the hydraulic excavator is a small-swing type hydraulic excavator, the upper revolving unit must have a circular shape and must be downsized. Therefore, a counter weight formed in an arc shape around the hydraulic pump. The hydraulic oil tank is also arranged close to the hydraulic pump or the like. Therefore,
In the vicinity of the hydraulic pump, a space for installing the pilot filter cannot be secured. Further, even if a pilot filter is mounted near the hydraulic pump, there is a problem that inspection work and maintenance work become very difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to improve workability by easily performing an inspection work of a pilot filter and a replacement work of a filter element. It is an object of the present invention to provide a swiveling construction machine capable of performing the above-mentioned operations.

[0014]

A revolving construction machine according to the present invention includes a lower traveling body and an upper revolving body rotatably mounted on the lower traveling body, wherein the upper revolving body includes a revolving frame. A counter weight mounted on the rear side of the revolving frame, an engine mounted on the revolving frame positioned in front of the counter weight, a main pump and a pilot pump mounted on the engine, and the engine And a control valve unit connected to the main pump and the pilot pump, and provided in the middle of a pipe between the pilot pump and the control valve unit, and supplied from the pilot pump. And a pilot filter that cleans the pressurized oil by the filter element.

[0015] In order to solve the above-mentioned problems,
A feature of the structure adopted by the invention according to claim 1 is that the pilot filter is located on the front side of the control valve unit and is arranged on the turning frame.

With this configuration, the space on the front side of the control valve unit is separated from the main pump and the pilot pump, and there are few hoses and hydraulic equipment. Therefore, the pilot filter disposed in this space can be visually checked from the outside. Inspection work can be easily performed. In addition, since the front position of the control valve unit is close to the front end of the frame, when exchanging the filter element, the attachment / detachment tool can be easily engaged with the pilot filter from the front side of the frame.

According to a second aspect of the present invention, a cab is provided on the swivel frame on one side in the left and right directions in front of the engine, and a control valve unit is provided on the opposite side of the cab from the left and right directions. A tool box for accommodating tools is provided on the front side, and a pilot filter is arranged near the tool box.

With this configuration, the pilot filter can be arranged by utilizing the space near the tool box located on the front side of the control valve unit on the opposite side of the cab and left and right directions.

According to a third aspect of the present invention, the turning frame is provided with a cab located on one side in the left and right directions in front of the engine, and on the opposite side in the left and right directions in front of the engine. A hydraulic oil tank and a fuel tank are provided, a control valve unit is provided on the front side of the hydraulic oil tank and the fuel tank, and a tool box for storing tools is provided on the front side of the control valve unit. It is located near the tool box.

With this configuration, the space near the tool box located near the frontmost portion of the turning frame on the front side of the engine, the hydraulic oil tank, the fuel tank, and the control valve unit, that is, on the side opposite to the cab is used. In this case, the pilot filter can be arranged, so that inspection work and maintenance work of the pilot filter can be easily performed.

According to a fourth aspect of the present invention, the tool box is disposed above the revolving frame with a space with respect to the revolving frame, and the pilot filter is disposed in a space between the revolving frame and the tool box. .

With this configuration, the pilot filter and the tool box can be arranged in two stages, upper and lower, so that the space on the revolving frame can be effectively used.

According to a fifth aspect of the present invention, the revolving frame comprises a bottom plate and a pair of vertical plates standing upright on the bottom plate, and the filter element is attached to the bottom plate when the filter element of the pilot filter is attached or detached. That is, an opening to be inserted is provided.

[0024] With this configuration, the work of attaching and detaching the filter element of the pilot filter can be performed from the bottom side of the turning frame using the opening provided in the bottom plate of the turning frame.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A small swing hydraulic excavator will be described as an example of a swing construction machine according to an embodiment of the present invention, and will be described in detail with reference to FIGS. In the present embodiment, “front, rear” and “left, right” are used as meaning directions or positions viewed from an operator sitting in a driver's seat in a cab box.

Reference numeral 1 denotes a lower traveling body, and 2 denotes an upper revolving body rotatably mounted on the lower traveling body 1. A working device for excavating soil and the like is provided in front of the upper revolving body 2. (Not shown) is provided so as to be able to move up and down.

As shown in FIGS. 1 and 2, the upper revolving unit 2 is provided on a revolving frame 3 and on the front left side of the revolving frame 3, and has a driver's seat and an operation lever (both shown in FIG. 1). Cab box 4 as a cab in which
And an arc-shaped counter weight 5 attached to the rear end of the turning frame 3; a building cover 6 described later provided on the turning frame 3; an engine 10; a main pump 14; a pilot pump 15; It is roughly constituted by the unit 18 and the pilot filter 25,
It is formed in a substantially circular shape as a whole.

Here, as shown in FIGS. 3 and 4, the revolving frame 3 comprises an oval bottom plate 3A made of a single thick flat plate, the front side and the rear side of which are cut off linearly. Bottom plate 3
A is generally constituted by a pair of left and right vertical plates 3B, 3B standing upward from A and extending forward and backward.

Reference numeral 6 denotes a building cover provided on the revolving frame 3. The building cover 6 includes a back cover 7 provided on the back side of the cab box 4 and a counterweight located on the rear side of the cab box 4. 5 and a right cover 9 located on the right side of the vertical plate 3B of the revolving frame 3 and extending forward from the engine cover 8. Further, the engine cover 8 is opened by turning upward, and opens the engine 10 and the like to the outside.

Further, the right cover 9 has a substantially rectangular cylindrical peripheral surface portion 9A whose right side protrudes in an arc shape, and a rear surface portion for opening and closing the upper portion of the peripheral surface portion 9A. 3 and an opening / closing cover 9B rotatably supported by the shutter 3. And the right cover 9
Hydraulic oil tank 16, fuel tank 17, control valve unit 1
8, for accommodating the tool boxes 22 and 23, the pilot filter 25, and the like, and opening them to the outside when the open / close cover 9B is opened.

An engine 10 is mounted on the revolving frame 3 in front of the counterweight 5, and the engine 10 is arranged in a horizontal state extending leftward and rightward.

A radiator 11 is provided on the left side of the engine 10 and cools cooling water of the engine 10. An oil cooler 12 is provided on the radiator 11 and cools hydraulic oil. The radiator 11 and the oil cooler 12 Includes a cooling fan 1 rotationally driven by an engine 10.
3 supplies cooling air.

Reference numeral 14 denotes a main pump provided on the right side of the engine 10. The main pump 14 is connected to a traveling hydraulic motor of the lower traveling unit 1, a hydraulic cylinder of a working device, a swing motor (all not shown), and the like. It supplies pressurized oil.

Reference numeral 15 denotes a pilot pump connected in series to the main pump 14, which supplies a pilot oil pressure for driving a control valve unit 18, which will be described later.

Reference numeral 16 denotes a hydraulic oil tank provided on the front side of the engine 10 on the left side in the right cover 9. The hydraulic oil tank 16 is a rectangular parallelepiped container which is long in front and rear directions and upward and downward. It stores therein working oil supplied and discharged to the lower traveling body 1, the working device and the like.

Reference numeral 17 denotes a fuel tank provided in the right cover 9 and provided adjacent to the right side of the hydraulic oil tank 16.
It is formed as a rectangular parallelepiped container which is long in the rear direction and in the upward and downward directions, and stores fuel to be supplied to the engine 10 therein.

Reference numeral 18 denotes a hydraulic oil tank 16 and a fuel tank 17
A control valve unit comprising a plurality of hydraulic pilot type switching valves provided on the turning frame 3 at the front side of
The control valve unit 18 is supported on a bottom plate 3A of the revolving frame 3 via a support 19, as shown in FIGS. The control valve unit 18 controls the pilot oil pressure supplied from the pilot pump 15 by operating the pressure reducing valve type pilot valve with the operation lever in the cab box 4, and controls the hydraulic oil discharged from the main pump 14. It supplies and discharges the lower traveling body 1, the working device and the like as appropriate.

Reference numeral 20 denotes a bracket provided on the right front side of the turning frame 3.
Is bolted to the bottom plate 3A. On the upper side of the bracket 20, a mounting plate 20A to which the pilot filter 25 is mounted extends to the front side in the lateral direction. Further, the bracket 20 forms a support member that supports a tool box 22 described later.

Reference numeral 21 denotes another bracket provided on the left side of the bracket 20, and the bracket 21
It is bolted to the bottom plate 3A of the revolving frame 3 so as to oppose 0.

Reference numeral 22 denotes a tool box provided at a substantially frontmost position on the right side of the revolving frame 3. The tool box 22 accommodates tools and is formed as a trapezoidal box that opens upward. The tool box 22 is provided on the bottom plate 3 of the revolving frame 3.
It is supported by the upper ends of the brackets 20 and 21 at a position separated upward from A.

Reference numeral 23 denotes another tool box provided on the left side of the tool box 22. The tool box 23 is formed as a rectangular box opening upward, and the bottom plate 3A of the revolving frame 3 is provided.
It is bolted to.

Reference numeral 24 denotes a filter housing space defined between the bottom plate 3A of the revolving frame 3 and the tool box 22. The filter housing space 24 is opened forward and contains a pilot filter (described later). 25 are accommodated.

Reference numeral 25 denotes a pilot filter provided substantially at the forefront of the revolving frame 3 on the front side of the control valve unit 18.
Accommodation space 24 between bottom plate 3A and tool box 22
It is arranged vertically inside. The pilot filter 25 is connected to a pump-side pilot hose 28 described later.
A, a head cover 25A to which the multiple valve side pilot hose 28B is connected, a bottomed cylindrical case 25B screwed to the head cover 25A and detachably attached downward, and the head cover 25A located in the case 25B. Case 2
5B and a filter element 25C fixed therebetween. A polygonal engagement protrusion 25D with which a socket wrench 30 described later engages when the case 25B is attached or detached is provided on the bottom of the case 25B.

The pilot filter 25 has a head cover 25A bolted to a mounting plate 20A of the bracket 20. Further, the pilot filter 25
The pressure oil supplied from the pump-side pilot hose 28A is caused to flow into the case 25B and the filter element 25C
Through the control valve unit 1 through the multiple valve side pilot hose 28B.
8.

Reference numeral 26 denotes an opening located on the bottom plate 3A of the revolving frame 3 located below the pilot filter 25.
The opening 26 allows the filter element 25C to be inserted when the filter element 25C of the pilot filter 25 is attached and detached.

Reference numeral 27 denotes a cover provided on the bottom surface of the bottom plate 3A of the revolving frame 3 so as to close the opening 26. The cover 27 closes the opening 26 and is detachably attached to the bottom plate 3A. It has been stopped.

Reference numeral 28 denotes a hydraulic hose group routed around the control valve unit 18. The hydraulic hose group 28 includes the oil cooler 12, the main pump 14, the pilot pump 15,
Hydraulic oil tank 16, pressure-reducing valve type pilot valve in cab box 4, hydraulic cylinders of working equipment, revolving frame 3
Motor 29 and the lower traveling body 1 provided substantially at the center of the
And a plurality of hydraulic hoses extending to a traveling motor or the like.

The hydraulic hose group 28 includes a hydraulic hose for connecting the pilot pump 15 and the control valve unit 18, and a pump-side pilot hose 28 for connecting the pilot pump 15 and the pilot filter 25.
A, and a multiple valve side pilot hose 28B that connects the pilot filter 25 and the control valve unit 18 are provided.

The hydraulic excavator according to the present embodiment has the above-described configuration.
The operation when replacing the fifth filter element 25C will be described.

First, when replacing the filter element 25C of the pilot filter 25, the turning frame 3
The cover 27 attached to the bottom plate 3A is removed, and a socket wrench 30 serving as a detachable tool is engaged with the engaging projection 25D of the pilot filter 25 through the opening 26. By rotating the socket wrench 30 in this state, the case 25B is loosened and removed from the head cover 25A,
Take out the filter element 25C downward and replace it with a new one. Then, the case 25B is screwed to the head cover 25A again, tightened by the socket wrench 30, and the cover 27 is attached to the bottom plate 3A, so that the filter element 25C can be replaced.

At the time of replacing the filter element 25C, the socket wrench 30 can be easily engaged with the pilot filter 25 because the pilot filter 25 is disposed substantially at the forefront of the revolving frame 3. Can be easily performed.

As described above, according to this embodiment, the pilot filter 25 is disposed at the forefront of the turning frame 3 so as to avoid the hydraulic hose group 28 at the front side of the control valve unit 18. Opening / closing cover 9B of right cover 9
By opening the door, the pilot filter 25 can be easily viewed from the outside, and daily inspection work can be easily performed.

Further, since the pilot filter 25 is disposed at the forefront of the revolving frame 3, the installation space for the pilot filter conventionally provided near the engine and the pump in the machine room is reduced to other equipment. It can be used as a space for installing Thus, even with a small excavator in which the installation area of each device is limited, such as a small turning hydraulic excavator, the degree of freedom in arranging the devices in the machine room can be increased.

Since the pilot filter 25 can make the distance from the front end of the upper swing body 2 shorter, the filter element 25 using the socket wrench 30 can be used.
C replacement work can be easily performed, and workability can be improved.

Further, since the pilot filter 25 is disposed in the filter accommodating space 24 defined between the bottom plate 3A of the revolving frame 3 and the tool box 22, the tool box 22 and the pilot filter 25 are moved upward. , Lower two stages, and the space on the revolving frame 3 can be effectively utilized. Thereby, even in the case of a small swing type excavator in which the upper swing body 2 has a small circular shape,
Space for mounting the pilot filter 25 can be secured, and the degree of freedom in design can be increased.

Further, the pilot filter 25 is disposed below the tool box 22, and the tool box 22 is originally provided at a place where tools can be easily taken out, and is a place with good workability. Therefore, even if oil is scattered during the replacement work of the filter element 25C, the cleaning work can be easily performed.

In the embodiment, the case where the tool box 22 is provided above the bottom plate 3A of the revolving frame 3 and another tool box 23 is provided at a lower position adjacent to the tool box 22 will be described as an example. However, the present invention is not limited to this. For example, a large tool box may be formed by extending a tool box 22 at a high position to a position above another tool box 23 at a low position. Further, the other tool box 23 may be eliminated.

In the embodiment, the turning frame 3
Has been described as being constituted by one bottom plate 3A and a pair of vertical plates 3B, 3B erected on the bottom plate 3A, but the present invention is not limited to this, and for example, a modification shown in FIG. As shown in the figure, the revolving frame 41 includes a bottom plate 41A forming a thick member and a pair of vertical plates 4 standing upright on the bottom plate 41A.
1B, 41B and under covers 41C, 41D, 4 provided on the front side of the bottom plate 41A and forming part of the bottom plate 41A.
1E. In this case, an opening 42 for attaching and detaching the filter element 25C may be provided in the right under cover 41E.

Further, in the embodiment, the hydraulic shovel provided with the cab box 4 has been described as an example of the swivel type construction machine. The present invention may be applied to a hydraulic excavator provided with a canopy. Further, the present invention may be applied to other swing type construction machines such as a hydraulic crane.

[0060]

As described above in detail, according to the first aspect of the present invention, the pilot filter is located on the turning frame in front of the control valve unit. Away from the pilot pump and can be arranged using the space on the front side of the control valve unit, which has fewer hoses and hydraulic equipment. Thus, the pilot filter can be easily visually observed from the outside, and daily inspection work and the like can be easily performed. Moreover, the front position of the control valve unit is
Since the position is close to the front end of the revolving frame, when replacing the filter element of the pilot filter, the detachable tool can be easily engaged with the pilot filter, and workability at the time of replacement can be improved.
Further, the cleaning operation can be easily performed.

According to the second aspect of the present invention, the turning frame is provided with a cab on one side in the left and right directions in front of the engine, and a control valve is provided on the opposite side of the cab from the left and right directions. A tool box for storing tools is provided on the front side of the unit,
The pilot filter is provided near the tool box. Thus, the pilot filter can be disposed by utilizing the space near the tool box located on the front side of the control valve unit on the opposite side of the cab from the left and right directions.

According to the third aspect of the present invention, the turning frame is provided with a cab located on one side in the left and right directions on the front side of the engine, and on the opposite side of the left and right directions on the front side of the engine. A hydraulic oil tank and a fuel tank, a control valve unit is provided in front of the hydraulic oil tank and the fuel tank, and a tool box for storing tools is provided in front of the control valve unit. Is disposed near the tool box. This allows the engine, hydraulic oil tank, fuel tank,
That is, since the pilot filter can be arranged using the space near the tool box located at the most front part of the turning frame on the side opposite to the cab, inspection work and maintenance work of the pilot filter can be easily performed. .

According to the fourth aspect of the present invention, the tool box is arranged above the turning frame with a space relative to the turning frame, and the pilot filter is arranged in the space between the turning frame and the tool box. Therefore, the pilot filter and the tool box can be arranged in two stages, upper and lower. Thereby, the space on the revolving frame can be effectively used, and the degree of freedom in design can be increased.

According to the fifth aspect of the present invention, the turning frame comprises a bottom plate and a pair of vertical plates erected on the bottom plate, and the filter is attached to the bottom plate when a filter element of the pilot filter is attached to or detached from the bottom plate. An opening through which the element is inserted is provided. Thus, the operation of attaching and detaching the filter element of the pilot filter can be performed from the bottom side of the revolving frame using the opening provided in the bottom plate of the revolving frame, and the replacement of the filter element can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic shovel applied to an embodiment of the present invention.

FIG. 2 is a plan view showing a hydraulic excavator applied to the embodiment of the present invention.

FIG. 3 is a partially broken plan view showing the upper revolving superstructure with a building cover removed.

FIG. 4 is a plan view showing a turning frame.

FIG. 5 shows a control valve unit, a pilot filter, etc.
It is sectional drawing seen from the arrow VV direction in the middle.

FIG. 6 shows a control valve unit, a pilot filter, etc.
It is sectional drawing seen from the arrow VI-VI direction in the middle.

FIG. 7 is a plan view showing a turning frame according to a modification of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving structure 3, 41 Revolving frame 3A, 41A Bottom plate 3B, 41B Vertical plate 4 Cab box (cab) 5 Counter weight 10 Engine 14 Main pump 15 Pilot pump 16 Hydraulic oil tank 17 Fuel tank 18 Control valve unit 22 Tool Box 25 Pilot Filter 25A Head Cover 25B Case 25C Filter Element 26, 42 Opening 30 Socket Wrench (Tool for Removal)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideaki Tanaka 650, Kandamachi, Tsuchiura-shi, Ibaraki F-term in the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. (Reference) 2D015 CA00

Claims (5)

[Claims] An undercarriage includes an undercarriage and an undercarriage mounted on the undercarriage. The undercarriage includes a revolving frame and a counter mounted on a rear side of the revolving frame. A weight, an engine mounted on the revolving frame positioned in front of the counterweight, a main pump and a pilot pump mounted on the engine, and provided in front of the engine; A control valve unit connected to a pilot pump, and a pilot filter that is provided in the middle of the pipe between the pilot pump and the control valve unit and that cleans pressure oil supplied from the pilot pump by a filter element. In the swiveling construction machine configured, the pilot filter is provided in front of the control valve unit. Pivoting construction machine, characterized in that arranged on the revolving frame positioned. 2. A cab is provided on the revolving frame on one side in the left and right directions located in front of the engine, and on the front side of the control valve unit on the opposite side in the left and right directions from the cab. The swiveling construction machine according to claim 1, wherein a tool box for storing tools is provided, and the pilot filter is disposed near the tool box. 3. A cab is provided on the revolving frame on one side in the left and right directions on the front side of the engine, and on the opposite side in the left and right directions on the front side of the engine. A hydraulic oil tank and a fuel tank are provided, the control valve unit is provided on the front side of the hydraulic oil tank and the fuel tank, a tool box for storing tools is provided on the front side of the control valve unit, and the pilot filter is The swiveling construction machine according to claim 1, which is disposed near the tool box. 4. The tool box is arranged above the turning frame with a space relative to the turning frame, and the pilot filter is arranged in a space between the turning frame and the tool box. The swiveling construction machine according to 2 or 3. 5. The revolving frame includes a bottom plate and a pair of vertical plates set up on the bottom plate, and the filter element of the pilot filter is inserted into the bottom plate when the filter element of the pilot filter is attached and detached. The swiveling construction machine according to claim 1, wherein the opening is provided.