JPH10168943A - Swivel work machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent a room temperature in a cab from rising. SOLUTION: A side cover 2 that covers a device accommodation space 24.
6, a communication port 28 for communicating the inside and outside of the equipment housing space 24 is provided, and the rear face plate 16 constituting the building of the cab 13;
The left side plate 17 and the door 20 are provided with communication ports 29, 30, 31 for communicating the inside and outside of the cab 13, and the communication ports 28, 29 are provided with an exhaust fan 33 via grommet members 32. An intake fan 36 is attached to 31 via a grommet member 32. Thus, when hot air is generated in the equipment housing space 24, the ventilation fan 33 attached to the communication opening 28 of the side cover 26 sucks out the hot air in the equipment housing space 24 to the outside, and at the same time, each communication opening of the operation room 13 The exhaust cab 33 and the intake fan 36 attached to the cabs 29 to 31 can forcibly ventilate the cab 13 and lower the room temperature in the cab 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing type working machine such as a hydraulic shovel, a hydraulic crane, etc., which works while swinging an upper swing body.

[0002]

2. Description of the Related Art Generally, a hydraulic excavator suitably used for excavation work at a construction site and the like includes a lower traveling body and an upper revolving body rotatably mounted on the lower traveling body. A turning frame, a machine room provided on the rear side of the turning frame, a driver's cab located on the turning frame located on the front side of the machine room, and a vertically movable unit on the front side of the turning frame. And a working device provided.

A control valve for supplying and discharging an engine, a hydraulic pump driven by the engine, hydraulic oil discharged from the hydraulic pump to a swing motor, a hydraulic actuator for driving a working device, and the like is provided in the machine room. Etc. are accommodated. In the cab, usually, a driver's seat for an operator to sit down, an operation lever for operating a working device, and the like are provided.

[0004] In the case of a small turning type excavator used for excavation work at a narrow work site or the like, the turning radius of the upper turning body that turns with the working device is reduced, so that the space in the machine room is reduced. It is required to be as small as possible.

[0005] For this reason, in the small turning type hydraulic excavator,
Normally, a device housing space is formed in the swivel frame located below the floor plate of the driver's cab, a hydraulic device such as a control valve is housed in the device housing space, and protection for covering the device housing space from the periphery of the swivel frame. The cover is provided.

[0006]

However, in the small swing type excavator according to the prior art described above, the following problems occur when the control valve is provided below the floor plate of the cab.

That is, since the control valve generates heat by constantly supplying and discharging the high-pressure oil discharged from the hydraulic pump, the floor plate of the cab is heated by the heat from the control valve and the room temperature in the cab is increased. Raises the occupancy and greatly reduces the livability.

Further, since the floor panel of the cab is provided with an insertion hole through which electric wiring, control cables, and the like are inserted, hot air in the equipment housing space is directly introduced into the cab through the insertion hole, and Room temperature will rise.

Further, since the hydraulic pump attached to the engine is connected to the control valve by hydraulic piping, the machine room and the equipment housing space are partially in communication. For this reason, the cooling air sucked into the machine room by the fan of the
There is a problem that the heated cooling air enters the cab through the equipment accommodating space, and the room temperature in the cab further rises.

As described above, when the temperature in the driver's cab rises and the temperature in the equipment housing space below the floorboard of the driver's cab becomes high, the feet of the driver's seat become hot and the driving work efficiency is impaired. In particular, a working machine without an air conditioner, such as a small turning hydraulic excavator, has a disadvantage that workability in summer is significantly reduced.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems of the related art, and has as its object to provide a turning type working machine capable of preventing a room temperature in a cab from rising.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a lower traveling body and an upper revolving body which is mounted on the lower traveling body so as to be pivotable, wherein the upper revolving body is provided. A turning frame comprising: a turning frame; a machine room provided on the rear side of the turning frame and accommodating an engine therein; and a driver's cab provided on the turning frame at a front side of the machine room. Applies to work machines.

The first aspect of the present invention is characterized in that at least one of the members constituting the turning frame, the machine room, and the cab has a communication port for communicating the inside thereof to the outside. The communication port is provided with a grommet member for mounting a fan, and the grommet member is provided with a ventilation fan.

According to such a configuration, when the ventilation fan attached to the grommet member is operated, the inside of the turning frame, the machine room or the cab is forcibly ventilated.
As a result, the hot air generated during the operation of the engine or the like can be discharged to the outside, and this hot air can be prevented from entering the cab, and the room temperature in the cab can be lowered.

Further, the invention according to claim 2 is that the communication port is provided in at least one of a plate, a door, and a see-through window constituting a building of the cab.

According to such a configuration, when the ventilation fan attached to the grommet member is operated, the air in the cab is opened through the communication port provided in the plate, the door, or the see-through window that forms the building of the cab. By being discharged to the outside or introducing outside air into the cab, the cab can be forcibly ventilated, and the room temperature in the cab can be lowered.

Further, according to a third aspect of the present invention, a device housing space for housing a device capable of generating heat is provided between the lower side of the floor plate of the cab and the turning frame, and the communication port is provided with the device. The configuration is such that it is provided on a protective cover that covers the accommodation space.

According to this configuration, the grommet member is attached to the communication port provided in the protective cover that covers the device accommodating space, and the ventilation fan attached to the grommet member is operated to remove the hot air in the device accommodating space. It can be forcibly sucked out. Accordingly, even if hot air is generated in the device housing space due to heat generated by the devices housed in the device housing space, the room temperature in the cab can be reduced by discharging the hot air to the outside.

Further, the invention of claim 4 is that the grommet member is constituted by a frame-like body having a duct formed inside by a single flexible member.

According to such a configuration, since the grommet member has flexibility, by providing communication ports to members constituting the turning frame, the machine room, and the cab, the turning frame, the machine room, and the like are provided. Alternatively, a ventilation fan can be easily attached to a desired place in the cab via a grommet member. In addition, the duct formed inside the grommet member can enhance the ventilation in the driver's cab or the like when the ventilation fan operates.

Further, according to a fifth aspect of the present invention, the grommet member includes a frame-shaped peripheral wall, a front wall that closes a front side of the peripheral wall and forms a duct with the peripheral wall, and an outer surface of the peripheral wall. Grommet mounting groove provided on the side and fitted to the communication port, a ventilation port provided on the front wall side of the grommet mounting groove and provided on the lower side of the peripheral wall, and rearward of the grommet mounting groove And a fan mounting groove provided on the inner surface side of the peripheral wall for fitting and mounting the ventilation fan.

According to such a configuration, the grommet mounting groove is fitted to the communication port provided in the member constituting the turning frame, the machine room, and the cab, with the ventilation fan fitted in the fan mounting groove of the grommet member. By wearing, the ventilation fan can be easily attached to a desired place. Moreover,
Since the grommet member has flexibility, it is possible to prevent the vibration at the time of operation from being transmitted to the ventilation fan attached via the grommet member.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a swing type working machine according to the present invention will be described with reference to the drawings, taking a small swing type hydraulic excavator as an example.

In the drawings, reference numeral 1 denotes a hydraulic shovel as a swing-type working machine. The hydraulic shovel 1 includes a lower traveling body 2 and an upper part which is pivotally mounted on the lower traveling body 2 via a pivoting device 3. The revolving superstructure 4, an earth removal device 5 provided in front of the lower traveling body 2 for performing earth removal work, leveling work, and the like, and an elevating to the front side of the upper revolving superstructure 4 for performing excavation work and the like. A work device 6 is provided so as to be movable and swingable in the left-right direction.

Here, the excavator 1 is designed so that the upper swing body 4 can be swung at a narrow work site.
This is a so-called small swing type hydraulic excavator in which the swing radius of the upper swing body 4 is reduced. As shown in FIG. 2, the upper swing body 4 is formed in a substantially circular shape when viewed from above.

The upper swing body 4 is generally constituted by a swing frame 7, a machine room 8, an operator's cab 13, and the like, which will be described later.

Here, the revolving frame 7 has a skeletal structure of the upper revolving unit 4, and as shown in FIG. 5 and the like, a bottom plate 7A formed in a circular plate shape and a middle portion in the width direction of the bottom plate 7A. It comprises a pair of vertical plates 7B (only one is shown) extending in the front-rear direction and a horizontal plate 7C separating the machine room 8 and the operation room 13 from each other. At the front end of the vertical plate 7B, a bracket 7D (see FIG. 1) that supports the working device 6 so as to be able to move up and down and swing is provided. Also, the bottom plate 7
A mounting member 7 for supporting the driver's cab 13
E, 7E,... Are provided.

Reference numeral 8 denotes a machine room which is disposed on the revolving frame 7 at the rear side of the upper revolving unit 4 and is covered with a building cover. The machine room 8 includes an engine 9, a hydraulic pump 10, The tank 11 and the like are accommodated. Reference numeral 12 denotes a counterweight provided on the revolving frame 7 at the rear side of the machine room 8. The counterweight 12 balances with the working device 6 during the revolving operation of the upper revolving unit 4.

Reference numeral 13 denotes an operator's cab disposed on the revolving frame 7 at the front left side of the upper revolving superstructure 4, and the operator's cab 13 is mounted on each of the mounting members 7E as shown in FIG. Floor plate 14 disposed on the bottom plate 7A of the revolving frame 7,
Front plate 15, rear plate 16, left side plate 17, right side plate 1
8. A door 20 is provided on the left side plate 17 so as to be openable and closable. Also,
Front plate 15, rear plate 16, left side plate 17, right side plate 18
Have transparent windows 15A, 1 each made of tempered glass or the like.
6A, 17A and 18A are attached, and the windows 20A and 20B made of tempered glass or the like are also attached to the door 20. A driver's seat 21 for the operator to sit down, operation levers 22 and 22 located on both left and right sides of the driver's seat 21, and a plurality of traveling levers located in front of the driver's seat 21 are provided inside the driver's cab 13. Are provided.

Numeral 24 designates an equipment accommodating space formed between the floor plate 14 of the cab 13 and the bottom plate 7A of the revolving frame 7. The equipment accommodating space 24 is, as shown in FIGS. 7, bottom plate 7A, vertical plate 7B, horizontal plate 7C,
Floor plate 14, side cover 26, front cover 2 described below
7 etc.

Reference numeral 25 denotes a control valve housed in the equipment housing space 24. The control valve 25 is a traveling motor of the lower traveling body 2, a swing motor of the swing device 3, a hydraulic cylinder of the earth discharging device 5, a working device 6 Is configured as an aggregate (multiple valves) of a number of directional control valves, relief valves, brake valves, pilot valves, etc., for controlling the supply and discharge of the hydraulic oil discharged from the hydraulic pump 10 to each hydraulic actuator such as each hydraulic cylinder. ing. The control valve 25
Are heating elements that generate heat when hot oil is supplied and discharged from the hydraulic pump 10.

Reference numeral 26 denotes a side cover disposed below the cab 13 and disposed on the left side of the revolving frame 7, and 27 denotes a front cover disposed on the front of the revolving frame 7. The cover 26 and the front cover 27 cover the periphery of the device housing space 24 and constitute a protection cover for protecting the control valve 25 housed in the device housing space 24.

Reference numeral 28 denotes a rectangular communication port formed in the side cover 26. The communication port 28 is
The communication between the device housing space 24 covered with the like and the outside.

Reference numerals 29, 30, and 31 denote three rectangular communication ports formed in a building constituting the cab 13, and the communication port 29 is formed in the see-through window 16A of the rear panel 16 (see FIG. 6). The communication port 30 is formed in the see-through window 17A of the left side plate 17, and the communication port 31 is formed in the see-through window 20B of the door 20. Each of the communication ports 29 to 31 communicates the cab 13 covered by the building with the outside.

Reference numerals 32, 32,... Denote a communication port 28 formed in the side cover 26, and a grommet member for mounting a fan mounted on each of the communication ports 29 to 31 formed in the building of the operator cab 13. The grommet member 32 is formed of a single flexible member such as rubber or resin.

Here, the grommet member 32 includes a peripheral wall 32A having a rectangular frame shape, a front wall 32B closing the front side of the peripheral wall 32A, and a duct 32C formed between the front wall 32B and the peripheral wall 32A. And a grommet mounting groove 32D formed over the entire outer surface of the peripheral wall 32A, and provided below the peripheral wall 32A at a position closer to the front wall 32B than the grommet mounting groove 32D and guided to the duct 32C. A vent 32E for exhausting the hot air to the outside, and a grommet mounting groove 3
And a fan mounting groove 32F formed over the entire inner surface of the peripheral wall 32A at a position behind the 2D.

Reference numerals 33, 33 denote exhaust fans serving as ventilation fans provided on the grommet members 32 attached to the communication ports 28, 29. Each of the exhaust fans 33 has a rectangular frame-like casing as shown in FIG. 33A and the casing 3
The stator 33B includes a stator 33B fixed to the center of 3A, and a rotor 33D rotatably provided on the outer peripheral side of the stator 33B and having a plurality of fans 33C fixed to the outer peripheral side.

Numeral 34 designates the exhaust fan 33 as the grommet member 3.
2 is a mounting plate for mounting on the mounting plate 3
Numeral 4 is formed in a substantially square shape from a steel plate or the like, and a large-diameter ventilation hole 34A is formed at the center thereof. The mounting plate 34 may be formed integrally with the casing 33A of the exhaust fan 33.

Then, the exhaust fan 33 is connected to the plurality of bolts 3.
The exhaust fan 33 is mounted on the grommet member 32 by fitting the outer peripheral edge of the mounting plate 34 into the fan mounting groove 32F of the grommet member 32 in a state of being fixed to the mounting plate 34 by 5.

In this manner, with the exhaust fan 33 attached to the grommet member 32, the grommet member 32
The exhaust fan 33 is attached to the side cover 26 via the grommet member 32 as shown in FIG. 4 by fitting the grommet attachment groove 32 </ b> D into the inner peripheral edge of the communication port 28 formed in the side cover 26. It has become.

As shown in FIG. 6, a grommet member 32 having an exhaust fan 33 attached to an inner peripheral edge of a communication port 29 formed in the see-through window 16A of the rear panel 16 constituting the building of the cab 13 is provided. Is fitted to the cab 13
An exhaust fan 33 is mounted therein via a grommet member 32.

Further, 36, 36 are grommet members 32 in the communication ports 30, 31 formed in the building of the cab 13.
Are shown as intake fans as ventilation fans mounted through the air intake fan. Each of the intake fans 36 has the same configuration as the exhaust fan 33 except that the rotation direction during operation is different.

Each of the intake fans 36 is also mounted on the grommet member 32 via the mounting plate 34 in the same manner as the exhaust fan 33.
Are fitted to the inner peripheral edges of the communication ports 30 and 31, so that the respective intake fans 36 are attached to the cab 13 via the grommet members 32.

The present embodiment has the above-described configuration, and its operation will be described below.

First, when the engine 9 is operated, the pressure oil discharged from the hydraulic pump 10 is supplied to the control valve 25 and travels in response to the operation of the operation lever 22 and the lever-equipped pedal 23 disposed in the cab 13. It is supplied to and discharged from hydraulic actuators such as a motor, a swing motor, and a hydraulic cylinder. The control valve 25 generates heat when the high-pressure oil discharged from the hydraulic pump 10 is supplied, and the heat in the control valve 25 heats the air in the device housing space 24.

At this time, when the exhaust fan 33 attached to the side cover 26 is operated, the device housing space 24 heated by the heat of the control valve 25 is heated.
After being guided to the duct 32C of the grommet member 32 as shown by an arrow A in FIG. 4, the hot air in the inside is forcibly sucked out through the vent 32E.

This prevents the floor plate 14 of the cab 13 from being heated by the hot air in the equipment accommodating space 24, thereby cooling the foot of the driver's seat 21. By suppressing the flow of hot air into the cab 13, the room temperature in the cab 13 can be reduced.

Also, by forcibly sucking out the air in the equipment housing space 24 to the outside by the exhaust fan 33,
Since the interior of the equipment housing space 24 tends to have a negative pressure, the hot air in the equipment housing space 24 flows into the cab 13 through insertion holes (not shown) through which electrical wiring, control cables, and the like formed in the floor plate 14 are inserted. Can be suppressed, and the room temperature in the cab 13 can be lowered.

On the other hand, the see-through window 17A of the left side plate 17 and the see-through window 20B of the door 20 constituting the building of the operator cab 13
The outside air is introduced into the cab 13 through the communication ports 30 and 31 by the operation of each intake fan 36 attached to the air conditioner. When the exhaust fan 33 attached to the see-through window 16A of the rear panel 16 is operated, the communication port 29 is opened.
The air in the cab 13 is sucked to the outside. As a result, an air flow is formed in the cab 13 as shown by an arrow B in FIG. 3, and the inside of the cab 13 can be forcibly ventilated.

Therefore, for example, even if the hot air in the equipment accommodating space 24 or the cooling air heated by the engine 9 flows into the cab 13, the hot air and the like remain in the cab 13
The air is discharged to the outside along the flow of air formed in the cab 13 without staying inside. As a result, the cab 1
The room temperature in the hydraulic excavator 3 can be more effectively reduced, and the operation efficiency of the excavator 1 can be improved.

As described above, according to the present embodiment, the side cover 26 that covers the equipment housing space 24 is provided with the communication port 28 that communicates the inside of the equipment housing space 24 with the outside, and the building of the operator cab 13 is The rear panel 16, the left side panel 17, and the door 20 are provided with communication ports 29, 30, 31 for communicating the inside and the outside of the cab 13, and the communication ports 28, 29 are provided with an exhaust fan 33 through a grommet member 32. And attach
The communication ports 30 and 31 have a configuration in which an intake fan 36 is attached via a grommet member 32.

Thus, even if hot air is generated in the device housing space 24 due to heat generated by the control valve 25 housed in the device housing space 24, the side cover 26
By operating the exhaust fan 33 attached to the air conditioner, the hot air can be forcibly sucked to the outside through the communication port 28, thereby suppressing the heating of the floor plate 14 of the cab 13 by the hot air in the equipment housing space 24. The feet of the driver's seat 21 can be cooled.

Further, the exhaust fan 33 and each intake fan 36 attached to the building of the cab 13 are operated to operate the cab 1
By forcibly ventilating the inside of the device accommodation space 24,
Even if the hot air inside or the cooling air heated by the engine 9 flows into the cab 13, the hot air and the like can be discharged to the outside of the cab 13. As a result, an increase in the room temperature in the cab 13 can be suppressed, and the operation efficiency of the excavator 1 can be improved.

Further, according to the present embodiment, the use of the grommet member 32 having flexibility allows the device housing space 24 to be provided simply by providing the communication port 28 in the side cover 26.
The exhaust fan 33 and the intake fan 36 can be arranged in the cab 13 simply by providing the communication ports 29 to 31 in the building of the cab 13. It has a configuration. Therefore, by providing communication ports such as the communication ports 28 to 31, the cab 1
The arrangement position and number of the exhaust fan 33 and the intake fan 36 in 3 and the like can be freely set, and the ventilation efficiency and the like in the cab 13 can be improved.

Each exhaust fan 33 and each intake fan 3
6 is attached to the building of the cab 13, the side cover 26, and the like via the flexible grommet member 32,
Vibration during excavation work of the hydraulic shovel or the like is attenuated by the grommet member 32 and can be prevented from being directly transmitted to the exhaust fan 33 and the intake fan 36. This allows
The life of the exhaust fan 33 and the intake fan 36 can be extended, and the effect of suppressing the room temperature in the cab 13 can be maintained for a long time.

Further, since the grommet member 32 is formed of a single flexible member such as rubber, the structure is not only simple, but also the communication port 28 formed in the side cover 26 and the cab 13 Each communication opening 29-3 formed in the building
1 can be reliably waterproofed.

In the above embodiment, the turning frame 7
A communication port 28 is provided in a side cover 26 attached to the vehicle, and three communication ports 29, 30, and
31 and an exhaust fan 33 in the communication ports 28 and 29,
Although the case where the intake fan 36 is attached to the communication ports 30 and 31 has been described as an example, the present invention is not limited to this. For example, as shown by a dashed line in FIG. 37
By attaching an exhaust fan (not shown) to the communication port 37 via a grommet member, hot air generated in the machine room 8 when the engine 9 is operated may be forcibly discharged to the outside. .

In the above embodiment, three communication ports 29, 30, 31 are provided in the building of the operator's cab 13.
The exhaust fan 33 is mounted on the grommet member 32 via the grommet member 32, and the intake fan 36 is mounted on the communication ports 30 and 31 via the grommet member 32. However, the present invention is not limited to this. Two or less or four or more communication ports are provided, and the grommet member 32 is provided in the communication port.
, The exhaust fan 33 and the intake fan 36 may be mounted via the air conditioner.

Furthermore, in the above-described embodiment, a small swing type hydraulic excavator has been described as an example of a swing type working machine. However, the present invention is not limited to this, and another swing type working machine such as a hydraulic crane may be used. Can also be applied.

[0060]

As described above in detail, according to the first aspect of the present invention, any one of the members constituting the turning frame, the machine room or the cab is provided with a communication port for communicating the inside thereof to the outside, The communication port is provided with a grommet member for mounting a fan, and a ventilation fan is mounted on the grommet member. By operating the ventilation fan mounted on the grommet member, a turning frame, a machine room or a cab is provided. The inside can be forcibly ventilated. Thus, it is possible to prevent the hot air generated during the operation of the engine or the like from entering the cab, and to lower the room temperature in the cab.

According to the second aspect of the present invention, the communication port is provided in at least one of the plate, the door, and the see-through window constituting the building of the cab, so that the communication port is attached to the grommet member. When the ventilation fan is activated,
When the air in the cab is discharged to the outside or the outside air is introduced into the cab, the cab can be forcibly ventilated and the room temperature in the cab can be lowered.

In this case, since the ventilation fan is attached to the communication port via the grommet member, by forming the communication port at a desired position in the cab building, the ventilation fan can be moved to a desired position in the cab. You can install as many as you want. Therefore, the arrangement position of the ventilation fan in the cab can be freely set, and the room temperature in the cab can be more effectively lowered by increasing the ventilation efficiency in the cab.

Further, according to the third aspect of the present invention, an equipment housing space for housing heat-generating equipment is provided between the lower side of the floor panel of the cab and the turning frame, and the communication port is provided with the equipment housing space. Since it is configured to be provided on the protective cover that covers the space, by operating the ventilation fan attached to the grommet member, the hot air in the device housing space can be forcibly discharged to the outside. Thereby, even if the air in the equipment housing space is heated by the heat generated by the equipment housed in the equipment housing space, the floor plate of the driver's cab is prevented from being heated by the hot air in the equipment housing space. Can cool your feet.

In particular, since the air in the equipment housing space is forcibly sucked to the outside by the ventilation fan, the inside of the equipment housing space tends to have a negative pressure, so that the hot air in the equipment housing space flows into the cab. Thus, the room temperature in the cab can be reduced.

According to the fourth aspect of the present invention, since the grommet member is formed of a frame-like body having a duct inside by a single flexible member, the turning frame,
By providing the communication ports in the members constituting the machine room and the operator's cab, the ventilation fan can be easily attached via a grommet member to a desired place among the turning frame, the machine room, and the operator's cab. Moreover, due to the flexibility of the grommet member, transmission of vibration during operation to the exhaust fan can be suppressed, and the life of the exhaust fan can be extended.

According to the fifth aspect of the present invention, the grommet member includes a frame-shaped peripheral wall, a front wall that closes the front side of the peripheral wall and forms a duct between the peripheral wall, and an outer surface of the peripheral wall. A grommet mounting groove provided on the side and fitted to the communication port, a ventilation port provided on the front wall side below the grommet mounting groove and provided on the lower side of the peripheral wall, and a rearward position on the grommet mounting groove And a fan mounting groove provided on the inner surface side of the peripheral wall to fit and attach the ventilation fan, so that the grommet mounting groove is fitted to the communication port in a state where the ventilation fan is fitted to the fan mounting groove. By attaching the ventilation fan, the ventilation fan can be easily attached to the driver's cab, the protective cover, or the like.

Further, since the grommet member is made of a flexible material such as rubber, the waterproof property around the communication port provided in the driver's cab or the protective cover can be improved.

[Brief description of the drawings]

FIG. 1 is a partially broken external view showing a small turning hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a plan view showing a small turning hydraulic excavator.

FIG. 3 is a partially broken front view showing the cab of the hydraulic shovel.

FIG. 4 is an enlarged cross-sectional view showing a main part of the embodiment, viewed from the direction of arrows IV-IV in FIG. 1;

FIG. 5 is an exploded perspective view showing a turning frame, a side cover, a grommet member, an exhaust fan, and the like.

FIG. 6 is an exploded perspective view showing a cab building, a grommet member, an exhaust fan, and the like.

[Explanation of symbols]

 2 Lower traveling body 4 Upper revolving superstructure 7 Revolving frame 8 Machine room 9 Engine 13 Operating room 24 Equipment storage space 25 Control valve (Equipment) 26 Side cover (Protective cover) 27 Front cover (Protective cover) 28, 29, 30, 31 , 37 communication port 32 grommet member (fan fixture) 32A peripheral wall 32B front wall 32C duct 32D grommet mounting groove 32E ventilation port 32F fan mounting groove 33 exhaust fan (ventilation fan) 36 intake fan (ventilation fan)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobukatsu Asakura 650, Kandachicho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Ground 1 Hokuetsu Industrial Co., Ltd.

Claims (5)

[Claims] An undercarriage includes an undercarriage and an undercarriage mounted on the undercarriage. The undercarriage includes an undercarriage.
A swivel type comprising a swivel frame, a machine room provided on the rear side of the swivel frame and containing an engine therein, and an operator cab positioned on the front side of the machine room and provided on the swivel frame. In the work machine, at least one of the members constituting the turning frame, the machine room, and the cab is provided with a communication port for communicating the inside thereof to the outside, and the communication port is provided with a grommet member for mounting a fan. And a ventilation fan is mounted on the grommet member. 2. The revolving work machine according to claim 1, wherein the communication port is provided in at least one of a plate body, a door, and a see-through window constituting a building of the cab. 3. An equipment accommodation space for accommodating heat-generating equipment is provided between the lower side of the floor plate of the cab and the turning frame, and the communication port is provided with a protective cover for covering the equipment accommodation space. The swiveling work machine according to claim 1, wherein the swing work machine is configured to be provided. 4. The revolving work machine according to claim 1, wherein the grommet member is formed of a frame having a duct formed by a single flexible member. 5. The grommet member includes a frame-shaped peripheral wall, a front wall closing a front side of the peripheral wall to form a duct between the peripheral wall, and the communication port provided on an outer surface side of the peripheral wall. A grommet mounting groove that fits into the grommet mounting groove, a ventilation port provided on the front wall side below the grommet mounting groove and provided on the lower side of the peripheral wall, and a ventilation hole provided on the rear side of the grommet mounting groove and 5. The revolving work machine according to claim 1, further comprising: a fan mounting groove provided on an inner surface side, wherein the ventilation fan is fitted and mounted.