JP4133899B2 - Swivel work machine - Google Patents

Description

  The present invention relates to a turning work machine such as a backhoe.

In this type of prior art, the engine is placed horizontally at the rear of the swivel, and a support frame is provided across the engine, and a radiator is placed on the left and right sides of the engine. The fixed cover which covers is fixed, and the driver's seat is arrange | positioned through the support stand in front of it (for example, refer patent document 1).
JP 2001-20324 A

In the prior art, since the driver's seat is arranged in front of the fixed cover via the support base, the driver's seat is located in front of the engine, and if the space necessary for steering is taken in front of the driver's seat, the driver's seat turns. In addition to the support frame that fixes the fixed cover, the support table that supports the driver's seat is required.
Therefore, it is conceivable to place the driver's seat above the engine and support it with a support frame. However, if this is done, the strength of the support frame will be insufficient and it will be susceptible to hot air in the engine room.

An object of this invention is to provide the turning working machine which enabled it to solve such a problem of a prior art.
In the present invention, the support frame is arranged in four pillars and the driver's seat is arranged thereon, so that the driver's seat and the fixed cover can be supported easily and firmly, and the size of the swivel base in the front-rear direction can be made compact. An object of the present invention is to provide a swivel working machine.
It is another object of the present invention to provide a swivel work machine that can reduce the influence of hot air on a driver's seat by providing a hot air guide plate using a support frame.

Specific means for solving the problems in the present invention are as follows.
First, the engine 3 is disposed horizontally at the rear part of the swivel base 2 and a rectangular support frame 4 having four pillars is provided across the engine 3, and a wind suction radiator is provided on the left and right sides of the engine 3. 5, a bonnet cover 7 that covers the back of the engine 3 is provided, a fixed cover 6 that covers the top and front of the engine 3 is fixed to the support frame 4, and a driver's seat 12 is disposed on the top of the fixed cover 6. In other words, it is supported by the support frame 4.
As a result, the driver's seat 12 and the fixed cover 6 can be easily and firmly supported by the support frame 4, the front-rear distance between the engine 3 and the driver's seat 12 can be shortened, and the size of the swivel base 2 in the front-rear direction can be made compact.

Secondly, a guide plate 29 for guiding the air passing through the radiator outward and downward is provided on the upper and front portions of the support frame 4 on the side opposite to the radiator arrangement, and the space between the fixed cover 6 is sealed. It is that.
Thus, hot air and noise in the engine room can be reliably prevented from leaking from the fixed cover 6 to the driver's seat 12 side on the side opposite to the radiator arrangement, and the comfortability can be improved.
Thirdly, a work operation device 15 incorporating an electrical component 30 is provided above the support frame 4 on the side opposite to the radiator arrangement and above the guide plate 29.

Accordingly, hot air can be guided from the engine room to the outside on the side opposite to the radiator arrangement, and adverse effects of the hot air on the electrical component 30 can be reduced.
Fourth, a bonnet cover 7 covering the back of the engine 3 is pivotally supported on the rear column 4D of the support frame 4 opposite to the radiator arrangement so as to be openable and closable. 62 and the counterweight 31 provided at the rear end of the swivel base 2 is provided with the edge seal member 32.
Thus, hot air and noise in the engine room can be reliably prevented from leaking from the bonnet cover 7.

Fifth, the hood cover 7 is pivotably supported on the rear support 4D of the support frame 4 on the side opposite to the radiator arrangement, and the side cover covers the side of the radiator 5 on the front support 4A of the support frame 4 on the radiator arrangement side. 8 is provided so as to be openable and closable, and the free end edge of the bonnet cover 7 and the rear end edge of the side cover 8 are overlapped to seal between them.
As a result, the bonnet cover 7 and the side cover 8 can be opened simultaneously, maintenance of the radiator 5 and its vicinity can be facilitated, and sealing of the overlapping portions of both covers can be easily performed.

  According to the present invention, the driver's seat 12 and the fixed cover 6 can be easily and firmly supported by the support frame 4, the front-rear distance between the engine 3 and the driver's seat 12 is shortened, and the front-rear dimension of the swivel base 2 is compact. Can be. Further, it is possible to reliably prevent hot air and noise in the engine room from leaking from the fixed cover 6 to the driver's seat 12 side on the side opposite to the radiator arrangement, and to improve the comfortability.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 12, reference numeral 1 denotes a standard type or a small rear turning type backhoe exemplified as a turning work machine. The backhoe 1 includes a crawler traveling device 35, an upper body 36 having a turning table 2, and a turning table 2. It is mainly composed of a mounted excavating device 37 and a dozer device 42 provided at the front of the crawler traveling device 35.
The crawler traveling device 35 rotatably supports driving wheels, driven wheels, and a plurality of intermediate rollers between the front and rear portions of the left and right side frames 38a of the track frame 38, and a rubber or iron crawler 39 is wound around them. The drive wheels are configured to be driven by a travel drive source such as a hydraulic left / right travel motor 40.

The track frame 38 supports the left and right side frames 38a so as to be movable in the left-right direction and is moved by a hydraulic cylinder. The left-right crawler travel device 35 is a variable leg that can change the distance between the heads.
When the crawler traveling device 35 is the widest leg, the distance L1 from the turning axis X (shown in FIGS. 6, 7, and 11) to the outer ends of the left and right crawler traveling devices 35 is substantially the same as the maximum radius of the swivel base 2. Or slightly longer, and may be set to be about 10% longer.
When the crawler traveling device 35 is the narrowest leg, the distance L2 from the pivot axis X to the outer end of the left and right crawler traveling device 35 is the distance from the pivot axis X to the left and right side surfaces of the swivel base 2 in the forward posture. It is substantially the same or slightly longer, and may be set about 10% longer.

The track frame 38 has the swivel base 2 mounted thereon via a swivel bearing 41, and the swivel base 2 can be swung left and right around the swivel axis X by a swivel motor 44. A dozer device 42 is mounted on the front portion of the track frame 38 through a dozer cylinder 43 so as to be movable up and down.
1 to 14, on the swivel base 2, an engine 3, a radiator 5, a hydraulic pump 21 driven by the engine 3, a hydraulic oil tank 22, a fuel tank 23, a cover device 9 that covers them, and a cover device 9 The driver's seat 12 and the left and right work operation devices 14 and 15, the traveling control device 19 disposed in front of the driver's seat 12, and the like are mounted, and thereby the upper body 36 is formed.

The front side of the driver's seat 12 of the swivel base 2 is a step 45, and a swing bracket 48 of the excavator 37 is mounted on the front part of the swivel base 2 through a receiving bracket 46 so as to be swingable around a vertical axis 47. ing.
In the excavator 37, a swing bracket 48 supported by the receiving bracket 46 via a vertical axis 47 is swingable by a swing cylinder. The swing bracket 48 includes bases of a boom 49 and a boom cylinder 50. The arm 51 is pivotally supported through a horizontal axis, the arm 51 is pivotally supported at the tip of the boom 49, and the arm cylinder 52 is vertically swingable. The bucket (working tool) 53 is pivotally supported at the tip of the arm 51. Thus, the bucket cylinder 54 enables scuffing (scraping) and dumping operation.

As shown in FIGS. 6, 7, and 10 to 14, the receiving bracket 46 projects forward from the front surface (frontmost end) of the swivel base 2 on the front side of the traveling control device 19. The receiving bracket 46 is shifted to the left and right other side (right side), while being shifted from the center line passing through the pivot axis X to the left and right side (left side).
The plane shape of the swivel base 2 is a substantially forward and rear circular shape having right and left side surfaces parallel to a straight front surface and an arc-shaped back surface, and the front end of the receiving bracket 46 or the vertical direction from the swivel axis X of the swivel base 2. The distance to the shaft 47 is set to be approximately equal to or shorter than the distance from the pivot axis X to the rear end of the swivel base 2, and the both distances are the pivot axis when the crawler traveling device 35 is a wide leg. The distance from the center X to the outer end of the crawler 39 is preferably substantially the same or smaller.

Since the swivel work machine 1 is small, the swivel base 2 has an extremely small area, and the front surface of the driver's seat 12 is disposed at substantially the same position as the swivel axis X.
As shown in FIGS. 9 to 14, the swivel base 2 has a pair of left and right vertical walls 57 extending rearward from the front receiving bracket 46 on a base plate 2 </ b> A serving as a base, and left and right vertical walls 57 in the middle. The partition wall 58 is erected so as to cross the vehicle, the receiving wall 59 connected to the rear ends of the left and right vertical walls 57 is erected at the rear, and the vehicle equipment disposed on the base plate 2A in the middle and the surroundings A mounting stay is installed for mounting a surrounding cover and the like.

The engine 3 is horizontally disposed in a rear portion of the base plate 2A so as to be fitted between the partition wall 58 and the left and right receiving walls 59, and a support frame 4 having four pillars is provided across the engine 3. In addition, an arc-shaped counterweight 56 is placed at the rear end, and is mounted via left and right receiving walls 59.
The support frame 4 is rectangular at the top and front, and the left and right sides and the rear are gate-shaped. The left and right columns 4A and 4B at the front are connected at the bottom by a mounting plate 60A. Is detachably bolted to the upper surface of the partition wall 58.

The left and right columns 4C, 4D at the rear of the support frame 4 also have a mounting plate 60B at the lower end, and are detachably bolted to the left and right receiving walls 59.
A support portion 18A is formed on the upper portion of the partition wall 58 to fix the plate material and receive the mounting plate 60A. The support portion 18A is fixed to the upper portion of the left and right receiving walls 59 to receive the mounting plate 60B. These support portions 18 (18A, 18B) allow the support frame 4 to be attached to and detached from the base plate 2A from above with the engine 3 mounted on the base plate 2A. Since the vehicle equipment around the engine 3 is supported by the support frame 4, there is no obstacle to fitting the support frame 4 on the upper side of the engine 3.

The support frame 4 includes a pair of gate-shaped members formed in a gate shape by fixing a band plate to an L-shaped plate, left and right columns 4A and 4B at the front, left and right columns 4C and 4D at the rear, and the upper part Left and right lateral portions 4E, 4F are formed, the mounting plate 60A is fixed to the front lower ends of the left and right support posts 4A, 4B of the two gate-shaped members, and the strips or strips are attached to the upper ends of the front left and right support posts 4A, 4B A front beam member (front upper beam) 61 bent in a circular arc shape is fixed, and a thick plate rear beam member (rear upper beam) 62 is fixed to the rear upper part of the left and right lateral portions 4E, 4F. The outer frame of the engine room is formed.
The front beam member 61 is provided with a mounting portion 61a for attaching a pivotal support 63 for rotatably supporting the front portion of the driver's seat 12 about the horizontal axis, and the rear beam member 62 may be a canopy (ropus or awning device). ) Of the driver's seat protection device 13 is mounted (a column mounting portion) 62a for mounting the column 13A.

The driver seat 12 has a rear portion mounted and supported on the left and right lateral portions 4E and 4F or the rear beam member 62, and substantially the entire region thereof is located on the support frame 4 and the engine 3, and the entire load thereof is supported by the support frame. 4, the support frame 4 is a four-column type, so that the support strength can be increased and the support of the driver's seat 12 and the driver's seat protection device 13 can be strengthened.
A fixed cover 6 covering the front surface and the upper surface is fixed to the support frame 4, and this fixed cover 6 is formed of an L-shaped plate material (or two sheets of a front plate and an upper plate) in side view, Bolts are fixed to the front left and right columns 4A and 4B, the front beam member 61 and the left and right horizontal portions 4E and 4F on the upper surface, and are fitted to the rear beam member 62 and fastened together with the driver's seat protection device 13.

The upper part of the fixed cover 6 enters the support frame 4 and an upper inspection window 90 is formed at the entry part. The upper inspection window 90 is closed with an upper lid, and the front part also enters the support frame 4 and enters the support frame 4. A front inspection window 91 is formed in the portion, and the front inspection window 91 is closed with a front lid.
9 to 12 and 21, the right lateral portion 4F of the support frame 4 is provided with an upwind guide plate 29A inclined downward to the right and the right column 4B has a forward wind guide plate 29B inclined to the right outward and rearward. Is provided to guide the hot air from the radiator fan to flow downward to the right rear.

Further, a seal member 28 is interposed between the fixed cover 6 and the right support 4B and the right lateral portion 4F of the support frame 4, so that hot air and noise are guided to the upwind guide plate 29A and the upwind guide plate 29B. Before being done, it does not leak to the driver's seat 12 side through the gap between the two.
The two guide plates (upper wind guide plate 29A and front wind guide plate 29B) are formed of sheet metal or the like, but instead of or in addition, between the right edge of the fixed cover 6 and the member on the right side thereof. Further, a sealing material may be interposed between the two to prevent hot air leakage to the driver's seat 12 side. .
An air cleaner 10, a muffler 11, an oil filter 92, a reserve tank 93 and other vehicle equipment are disposed between the support frame 4 and the engine 3, and are attached to the support frame 4 itself. The support frame 4 can be attached to and detached from the base plate 2A from above the engine 3 in a state in which some of the vehicle devices are assembled and assembled.

An engine-driven hydraulic pump 21 is disposed on one of the left and right sides (right side) of the engine 3, and a radiator 5 and a radiator fan are disposed on the other left and right sides (left side, entrance / exit side) of the engine 3, and on the outer side of the radiator 5. An oil cooler 64, a battery 65, and the like are disposed, and these are mounted on the base plate 2A separately from the support frame 4.
The radiator 5 is of a wind suction type and is mounted on the base plate 2A adjacent to the left side surface of the support frame 4, and an upper portion of the radiator 5 is supported on a support stay 16A protruding outward from the left lateral portion 4E via a bracket 16B. Connected and fixed.

14 to 18, a plurality of plate or bar stays 66 project outward from the left lateral portion 4 </ b> E, and the base 14 a of the left work operation device 14 is fixed via the stays 66. . The base 14a is located on the left outer side of the radiator 5, and supports the lower pivot portion 70 of the device frame 69 of the left work operating device 14 through the pivot shaft 70a so as to be swingable around the horizontal axis.
The device frame 69 has a box shape whose upper part is long in the front-rear direction, and a lower pivot part 70 supported by the pivot axis 70a is formed thin in the front-rear direction. An urging means (coil spring) is fitted to the pivot shaft 70a to urge the left work operation device 14 in the direction from the operation posture to the rising retreat posture.

The left work operation device 14 includes a posture change means 74 that is attached to the upper portion of the device frame 69 by a pilot valve 72L that is operated by a left operation lever 71L and that is operated by a posture change lever 73.
The posture changing lever 73 is fixed to one end of a lever shaft 73a pivotally supported on the box-shaped upper portion of the apparatus frame 69, and a cam 77 having a cam groove 77a is fixed to the other end of the lever shaft 73a. The cam groove 77a is fitted in a cam follower 78 provided on the base 14a.
An engagement recess 77b is formed in the back of the cam groove 77a, and the cam 77 is moved with respect to the cam follower 78 via the posture changing lever 73 so that the cam follower 78 moves to the back side of the cam groove 77a. Next, the device frame 69 is swung around the pivot shaft 70a, and the left work operation device 14 is changed from the retracted posture (solid line position in FIGS. 6 and 7) to the operating posture (dotted line position in FIGS. 6 and 7). As a result, the engaging recess 77b engages with the cam follower 78 to hold the left work operating device 14 in the operating posture. In this operation posture, the engagement between the engagement recess 77 b and the cam follower 78 is maintained by the urging member 17 provided on the posture change lever 73.

The change from the operating posture to the retracted posture is performed by swinging the posture changing lever 73 upward against the urging member 17 so that the engaging recess 77b is detached from the cam follower 78 and is operated by the posture changing lever 73. When the posture maintenance is canceled and the posture change lever 73 is further moved upward, the left work operation device 14 is raised together.
The urging member 17 that provides rotational force to the cam 77 in order to engage the engaging recess 77b with the cam follower 78 is provided between the posture changing lever 73 and the rear part of the box-shaped upper portion of the device frame 69. In addition, the lower pivotal support portion 70 is formed to be thin in the front-rear direction by being provided not in the vertical direction but in the box-shaped upper portion of the apparatus frame 69 in the front-rear direction so that it can be disposed in the side cover 8.

A side cover 8 that covers the radiator 5, the oil cooler 64, and the battery 65 is disposed on the left outer side of the radiator 5, the oil cooler 64, and the battery 65. The side cover 8 is detachably attached to the base plate 2A and the support frame 4. It is fitted to the lower part of the left work operating device 14 and blinds the pivot shaft 70a and the lower pivot portion 70.
3, 5, 7, 10, and 12, the side cover 8 is open at the top and has the lower pivot portion 70 of the left work operating device 14 disposed therein, covering the lower pivot portion 70, and The work operation device 14 is moved as close as possible to the left side surface of the swivel base 2 so that the left and right dimensions of the swivel base 2 are compactly configured.

The side cover 8 has a front surface 8a substantially flush with the front surface 6a of the fixed cover 6, and a partition wall raised from the left front column 4A (or the base plate 2A) of the support frame 4 through a vertical axis (hinge) 79. 58) is openably and closably supported, and the rear end thereof is disposed close to the left end of the bonnet cover 7.
Further, the left work operation device 14 has a cover 76 on the device frame 69, and the front surface (the front surface of the left work operation device 14) 76 a in the retracted posture with the cover 76 is attached to the side cover. 8, the front surface 8a of the fixed cover 6 and the front surface 6a of the fixed cover 6 are substantially flush with each other (the front-rear direction position is substantially the same), and the front surface 12a of the driver's seat 12 is also substantially flush with them.

The fixed cover 6, the side cover 8, the driver's seat 12, and the left work operation device 14 may be any one or two may be shifted back and forth with respect to the other, but it is preferable to shift back from the front, By making the front surface 8a of the side cover 8 and the front surface 6a of the fixed cover 6 that are the rising walls on the back surface of the step 45 substantially flush, the area of the step 45 is increased, and the area from the entrance 20 to the driver's seat 12 is increased. It becomes easier to pass.
3, 12, 19, and 20, a bonnet is connected to a right rear support column 4 </ b> D of the support frame 4 positioned on the right rear side of the engine 3 on the opposite side of the entrance / exit 20 and the radiator 5 via a vertical axis (hinge) 82. The right end of the cover 7 is pivotally supported so as to be freely opened and closed.

The left end (free end edge) of the bonnet cover 7 is adjacent to the rear end (free end edge) of the side cover 8 and can be overlapped from the outside via an edge seal member 32. By locking with a lock provided between the rear end weight 31, the side cover 8 can be prevented from being opened.
The planar shape of the bonnet cover 7 is an arc shape close to the rear shape of the counterweight 31, and an edge seal member 32 is provided on the peripheral edge thereof, and the rear end of the side cover 8, the rear beam member 62 of the support frame 4, and the counterweight. 31 is sealed to prevent the hot air and noise in the engine room from leaking from the hood cover 7.

The bonnet cover 7 is at the right end, and the side cover 8 is pivotally supported by the support frame 4 at the front surface. That is, the bonnet cover 7 is pivotally supported via the vertical axis on the opposite side and the opposite side so as to be swingable. Therefore, as shown in FIG. 3, the rear opening of the engine 3 and the radiator 5, the side of the radiator 5, the oil cooler 64 and the battery 65, and the upper side of the engine 3 and the engine room can be exposed. Most vehicle equipment can be easily maintained.
Moreover, since the bonnet cover 7 is a lateral opening type, it can be opened largely without being obstructed by the driver's seat protection device 13 on the upper side. The bonnet cover 7 can be opened independently without opening the side cover 8.

A hydraulic pump 21 to which rotational power is transmitted from the crankshaft of the engine 3 is arranged on the right side of the engine 3. A hydraulic oil tank 22 is arranged in front of the hydraulic pump 21, and in front of the hydraulic oil tank 22. A fuel tank 23 is arranged.
A box 81 of the right work operating device 15 is provided on the right lateral portion 4F of the support frame 4 above the upper wind guide plate 29A. A right pilot valve 72R having a right operation lever 71R is provided at the front part of the box 81, two operation levers 84 and 85 are supported on the right side surface, and the electrical component 30 is incorporated in the rear part. The upper wind guide plate 29A that guides the hot air from the inside of the engine room to the outside avoids adverse effects of the hot air on the electrical component 30. Reference numeral 83 denotes a box cover of the box 81.

The hydraulic oil tank 22 and the fuel tank 23 are located on the right side of the driver seat 12 and are covered with a tank cover 24. The front wind guide plate 29 </ b> B is located behind the hydraulic oil tank 22 to avoid adverse effects due to hot air on the hydraulic oil tank 22.
The tank cover 24 includes an inner wall plate (side wall) 24A on the step 45 side, and an outer cover 24B that covers the upper and right sides of the hydraulic oil tank 22 and the fuel tank 23 and the front surface of the fuel tank 23.
The inner wall plate 24A is fixed to the right end of the base plate 2A and the right column 4B of the support frame 4 or the fixed cover 6, and is disposed to protrude forward from the support frame 4. The left side surfaces of the hydraulic oil tank 22 and the fuel tank 23 are disposed on the inner wall plate 24A. Covering.

The outer cover 24B covers the upper surface, the right side surface, and the front and rear surfaces of the hydraulic oil tank 22 and the fuel tank 23. A fuel inlet is formed at a position corresponding to the upper portion of the fuel tank 23, and is closed with a lid 24C. ing. In addition, a porous air exhaust 24D is formed on the right side.
The surface on the step 45 side of the inner wall plate 24 </ b> A and the fuel tank 23 is inclined rightward as it goes forward, and the front space on the step 45 is widened to facilitate the operation of the traveling control device 19.
Further, the side surface 22a on the step 45 side of the hydraulic oil tank 22 is inclined rightward as it goes backward, and a substantially triangular space 26 that is spaced apart as it goes backward between the inner wall plate 24A and the support frame 4 is formed. Formed (shown in FIG. 10). In this space 26, hydraulic piping and / or harnesses are arranged, and piping and maintenance are facilitated by centrally arranging them.

A control valve 94 in which a large number of valves are connected in the left-right direction is mounted on the front upper part of the base plate 2A of the swivel base 2. The periphery of the base plate 2A is covered with a side cover 99, and a step 45 above it is a step on the base plate 2A. It is formed by attaching a plate and laying a mat on its upper surface.
The traveling control device 19 at the front of the swivel base 2 has operation pedals such as left and right traveling levers 95L and 95R, service port pedals 96 and swing pedals 97 under the feet, and a front handrail 98 is provided in front of them. ing.

In the present invention, the shape of each member and the positional relationship between the front, rear, left, and right in the embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.
For example, the swivel work machine 1 may be an ultra-small swivel type in which a boom is pivotally supported on the center side of the swivel base 2, or the swivel base 2 and the devices mounted thereon may be configured in the opposite direction.
The support frame 4 may have a structure having five or more columns, the hood cover 7 may be an upper pivot type, or the side cover 8 may be a rear end pivot type or a detachable type.

  In addition, the driver's seat 12 can be adjusted in the front-rear position, and a cabin can be mounted on the swivel base 2 instead of the driver-seat protection device 13.

It is the perspective view which looked at the turning work machine whole from the left front. It is the perspective view seen from the same right front. It is the perspective view which looked at the upper body of the turning work machine from the left rear. It is the perspective view seen from the same right back. It is a front view of a turntable. It is the same top view. It is the left side view. It is the same right view. FIG. It is a top view which shows the cover apparatus of a turntable. It is a top view which shows the mounting apparatus of a turntable. It is a cross-sectional side view which shows the internal structure of a turntable. It is the disassembled perspective view seen from the left front which shows the installation seat of the driver's seat and canopy of a turntable. It is a perspective view which shows the mounting apparatus of a turntable. It is a perspective view which shows the relationship between a support frame and a left-right work operation apparatus. It is a perspective view from the left front which shows the left operation device and its vicinity. It is a perspective view from the right front which shows the left operation device and its vicinity. It is a perspective view from the left rear which shows the left operation device and its vicinity. It is a cross-sectional top view which shows the adjacent part of a bonnet cover and a side cover. It is a cross-sectional top view which shows the pivotal support part of a bonnet cover. It is a perspective view of a support frame.

Explanation of symbols

1 Turning work machine (backhoe)
2 swivel 3 engine 4 support frame 5 radiator 6 fixed cover 7 bonnet cover 8 side cover 10 air cleaner 11 muffler 12 driver's seat 13 driver's seat protection device 14 left work operation device 15 right work operation device 16 support stay 24 tank cover 25 opening and closing Lid 26 Space 28 Seal member 29 Guide plate 30 Electrical component 31 Weight 32 Edge seal member

Claims (5)

The engine (3) is placed horizontally on the rear part of the swivel base (2), and a rectangular support frame (4) having four pillars is provided across the engine (3). A wind suction radiator (5) is arranged on the side, a bonnet cover (7) is provided to cover the rear of the engine (3), and a fixed cover (6) that covers the front and top surfaces of the support frame (4) is fixed. The driver seat (12) is arranged on the upper part of the fixed cover (6) and supported by the support frame (4) .
The front portion of the driver seat (12) is supported by a front beam member (61) at the front upper portion of the support frame (4), and substantially the entire area thereof is supported by the support frame (4), the engine (3), and the fixed cover (6). )
A swivel working machine characterized in that a bonnet cover (7) is pivotally supported via a longitudinal axis (82) on a rear column (4D) of a support frame (4) opposite to the radiator arrangement so as to be opened and closed .   A guide plate (29) for guiding the radiator passing air outward and downward is provided on the upper and front portions of the support frame (4) opposite to the radiator arrangement, and between the fixed cover (6). The turning work machine according to claim 1, wherein the turning work machine is sealed.   The work operation device (15) including an electrical component (30) is provided above the support plate (4) opposite to the radiator arrangement and above the guide plate (29). The turning work machine according to 2.   A bonnet cover (7) is pivotally supported on the rear column (4D) of the support frame (4) opposite to the radiator arrangement so as to be openable and closable. The peripheral edge of the bonnet cover (7) and the rear beam member of the support frame (4) The edge seal member (32) is provided between (62) and the counterweight (31) provided at the rear end of the swivel base (2). Swivel work machine. The upper part and the front part of the support frame (4) have a rectangular shape, and the upper part of the fixed cover (6) enters the support frame (4), and an upper inspection window (90) is formed in the entry part, The upper inspection window (90) is closed with an upper lid, the front part also enters the support frame (4), and a front inspection window (91) is formed in the entry part. The revolving work machine according to claim 1, wherein the revolving work machine is closed with a lid .

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