CN101168967A

CN101168967A - Engineering mechanism

Info

Publication number: CN101168967A
Application number: CNA2007101535761A
Authority: CN
Inventors: 汤上诚之; 福本务
Original assignee: Hitachi Construction Machinery Co Ltd
Current assignee: Hitachi Construction Machinery Co Ltd
Priority date: 2006-10-23
Filing date: 2007-09-21
Publication date: 2008-04-30
Anticipated expiration: 2027-09-21
Also published as: KR20080036513A; JP2008105470A; CN101168967B; KR101092290B1; JP4819647B2

Abstract

The invention provides an engineering machine enables the operator holding the handle to enter the machine enclosure, and to enter the machine enclosure swimmingly from the carriage space. A handle with excellent workability in narrow space is also provided. A handle (43) is provided on the intermediate post (39) at the left surface (36) of the machine enclosure, which is a ingathering handle rotating between the containing device on the outer surface of the machine enclosure body (31) and the holding position protruding from the machine enclosure body (31) outer surface to the outside. Even in a state the door (32) is closed, by rotating the handle (43) to a holding position, the handle (43) can be held in state of protruding outward from the outer surface of the intermediate post (39) on the outer surface of the machine enclosure body (31). The handle can be ingathered at a position more near to the inside of the door than the outside of the door (32) by ingathering the handle (43) in an ingathering position.

Description

Engineering machinery

Technical field

The present invention relates to engineering machinery, particularly about the engineering machinery of hydraulic crawler excavator of on the intermediate studdle of chassis body, being provided with the handrail that boarding uses etc.

Background technology

Be provided with in the band casing pattern engineering machinery of the casing that constitutes driver's cabin in the engineering machinery of hydraulic crawler excavator etc., as rotary frame, on the intermediate studdle of chassis body, be rotatably mounted the door that supplies boarding to use by linkage, and, the handrail that boarding is used is being set on intermediate studdle.This handrail is normally by welding or be bolted on the intermediate studdle, and in order use easily grasped, this handrail is mounted to from middle pillar door being opened the door opening portion side (boarding space side) that the back forms gives prominence to (patent documentation 1).

[patent documentation 1] Japan opens flat 5-57049 communique in fact

In the casing of the mini-excavator of 6 tons of less thaies, in order to suppress to give prominence to vehicle body after door is opened as much as possible, and near the central authorities' setting intermediate studdle and the Men Yiqi that are formed in casing are the form that rotate at the center, its result is, is difficult to enough guarantee roomily that textural becoming door opens formed boarding space, back.Simultaneously, the handrail used of boarding is installed into from middle pillar side-prominent to the boarding space.Therefore, the boarding space narrows down because of handrail, and when existing in the operator enters casing, operator's shoulder and handrail possibility of collision are very difficult to enter.

In order to make handrail not cause dwindling of boarding space, considered handrail to be set from the outstanding laterally mode of casing outer surface.But, in this case, because handrail has increased the width (overall width) of upper rotating body from the outstanding amount of casing outer surface, so in the operation variation in narrow place, not by preferably.

Summary of the invention

The purpose of this invention is to provide a kind of engineering machinery, the operator is got a grip on the rail enter in the operating room, and can enter swimmingly from the boarding space in entering casing the time, and have handrail in the operation excellence in narrow place.

(1) to achieve these goals, engineering machinery of the present invention comprises the casing with door that chassis body and boarding use, and by linkage above-mentioned door is installed in rotation on the intermediate studdle of said machine casing main body.Wherein, on above-mentioned intermediate studdle, be provided with the handrail that boarding is used, this handrail is mounted to and can be controlled under the state outstanding laterally from the external surface of said machine casing main body, and above-mentioned handrail can be housed at least in part the position of comparing more close inboard with the external surface of above-mentioned door.

Like this, owing to handrail is mounted to and can controlling from the outstanding laterally state of the external surface of chassis body, so the operator can enter as in the past in the casing by this handrail of grasping, and operator's shoulder can not run into handrail, thereby can successfully enter in the casing from the boarding space.

In addition, compare the position of more close inboard,, therefore can guarantee operation in the excellence of stenosis so suppressed the increase of overall width owing to above-mentioned handrail can be housed at least in part with the external surface of above-mentioned door.

(2) in addition, to achieve these goals, engineering machinery of the present invention has bottom driving body and upper rotating body, and upper rotating body comprises: the rotary frame with formation base infrastructure; Be arranged on this rotary frame, and have the casing of driver's seat; Be arranged on the counterweight at the rear portion on the above-mentioned rotary frame; Cover the part beyond casing on the above-mentioned rotary frame and the counterweight, and partial interior forms the containment vessel of Machine Room in the wings.Said machine casing is configured to: above above-mentioned rotary frame, be positioned at and occupy the part of assigning to the rear part of above-mentioned containment vessel from the front part of above-mentioned rotary frame, and the driver's seat in the said machine casing is positioned at the top of above-mentioned Machine Room; Said machine casing has the door that chassis body and boarding are used, and by linkage above-mentioned door is installed in rotation on the intermediate studdle of said machine casing main body.Wherein, on above-mentioned intermediate studdle, be provided with the handrail that boarding is used, this handrail is mounted to and can be controlled under the state outstanding laterally from the external surface of said machine casing main body, and above-mentioned handrail can be housed at least in part the position of comparing more close inboard with the external surface of above-mentioned door.

In view of the above, be in the mini-excavator of 6 tons of less thaies in engineering machinery, as described in above-mentioned (1), the operator grasping handrail enters in the casing, and can successfully enter from the boarding space in entering casing the time, and can guarantee the operation in the excellence of stenosis.

(3) in above-mentioned (1) or (2), preferred above-mentioned handrail be can compare with the external surface of above-mentioned door more close inboard along the collecting position of the external surface of said machine casing main body and from the external surface of said machine casing main body outstanding control the intake type handrail that rotates between the position.

(4) in addition, in above-mentioned (1) or (2), above-mentioned handrail also can be to be installed in the door that is arranged on the above-mentioned intermediate studdle to install with the fixed handrail in the recess.

The invention effect

According to the present invention, the operator grasping handrail enters in the casing, and can successfully enter from the boarding space in entering casing the time, and can guarantee the operation in the excellence of stenosis.

Description of drawings

Fig. 1 is the lateral view of the hydraulic crawler excavator that relates to of first embodiment of the present invention, is the figure that the state of the door that boarding uses has been closed in expression.

Fig. 2 is the lateral view of the hydraulic crawler excavator that relates to of first embodiment of the present invention, is the figure that the state of the door that boarding uses has been pulled down in expression.

Fig. 3 is the facial enlarged drawing in casing left side.

Fig. 4 is A-A line, B-B line, the C-C line sectional view along Fig. 3, and Fig. 4 (a) is along A-A line sectional view, and Fig. 4 (b) is along B-B line sectional view, and Fig. 4 (c) is along C-C line sectional view.

Fig. 5 is the amplification stereogram of handrail.

Fig. 6 is the facial enlarged drawing in casing left side of the engineering machinery that relates to of second embodiment of the present invention.

Fig. 7 is A-A line, B-B line, the C-C line sectional view along Fig. 6, and Fig. 7 (a) is along A-A line sectional view, and Fig. 7 (b) is along B-B line sectional view, and Fig. 7 (c) is along C-C line sectional view.

Symbol description

1 bottom driving body

2 upper rotating body

3 shake post

4 front side working rigs

5 rotary frames

6 casings

7 containment vessels

31 chassis bodies

32 boardings door

The 32a front door portion

The 32b rear door portion

36 casings left side is facial

38a, 38b, 38c, 38d glass window

39 intermediate studdles

41a, 41b linkage

42 front side leg portion

The handrail that 43 boardings are used

44 rearframe parts

The 44a handrail is installed and is used recess

45 outside steel sheet components

46 inboard steel sheet components

The 46a protuberance

47 outside steel sheet components

The 47a protuberance

48 inboard steel sheet components

The 48a protuberance

49 handrail installed surfaces

51 handrail assemblies

52 substrates

The a pair of carriage of 53a, 53b

The axle of 54 control

The grip of 55 control

56, the end plate member of 57 steel plate systems

58,59 rotation installing components

61 duct members

The web of 62 steel plate systems

63 helical springs

64,65 plate member

73 hold up bar

132 boardings door

The 132a front door portion

The 132b rear door portion

136 casings left side is facial

139 intermediate studdles

The handrail that 143 boardings are used

The 143a grip

143b, 143c foot

144 rearframe parts

The 144a handrail is installed and is used recess

145 outside steel sheet components

146 inboard steel sheet components

The 146a protuberance

147 outside steel sheet components

The 147a protuberance

148 inboard steel sheet components

The 148a protuberance

149 handrails are installed the recess of usefulness

The specific embodiment

Below, embodiments of the present invention are described with reference to the accompanying drawings.

Fig. 1 and Fig. 2 are the lateral views of the hydraulic crawler excavator of the engineering machinery that relates to of first embodiment of the present invention.Fig. 1 has represented to close the state of the door that the boarding that is arranged on the casing uses, and Fig. 2 represents state that this is pulled down.In the present embodiment, hydraulic crawler excavator for example is the rocker arm mini-excavator of 6 tons of less thaies.

In Fig. 1 and Fig. 2, the hydraulic crawler excavator that present embodiment relates to have bottom driving body 1, rotatably be equipped on upper rotating body 2 on this bottom driving body 1, by shake post 3 with can up and down and the left and right directions mode of rotating be linked to front side working rig 4 on this upper rotating body 2.

Upper rotating body 2 have the formation base infrastructure rotary frame 5, be arranged on casing 6 on the rotary frame 5, be arranged on the rear portion on the rotary frame 5 counterweight 7, cover the casing 6 on the rotary frame 5 and the containment vessel 8 of the part beyond the counterweight 7.Revolution rotary frame 5 is made of base plate and a plurality of stringer board three-dimensionally, and containment vessel 8 has sidepiece containment vessel 8a and rear portion containment vessel 8b, and the stringer board part of rotary frame 5 is covered by the lower portion of sidepiece containment vessel 8a.In addition, in the rear part of sidepiece containment vessel 8a and the inside of rear portion containment vessel 8b, the rear part upside on rotary frame 5 forms Machine Room 9, is accommodating motor in this Machine Room 9, by the machine of this engine-driven Main Hydraulic Pump, pioneer pump etc.In addition, the part of other in containment vessel 8 is being accommodated the working liquid container of engine fuel tank, hydraulic pump etc.

Before working rig 4 scraper bowl 13 that has swing arm 11, the dipper 12 that combines with swing arm 11 rotationally, combine with dipper 12 rotationally, drive with hydraulic cylinder 16 with hydraulic cylinder 15, scraper bowl with hydraulic cylinder 14, dipper by swing arm respectively.

Casing 6 is parts that its inside is formed with driver's cabin, as shown in Figure 2, pair of right and left

manual lever

23L, 23R that the driver's seat 21 that supplies the operator to take, pair of right and left manual lever 22L, the 22R (but only illustrating 22L) that preceding rotary manipulation is used, the usefulness of travelling are being set in casing 6 are (same, only illustrate 23L) and

pedal

24L, 24R (with, only illustrate 24L).The pair of right and left manual lever 22L that preceding rotary manipulation is used, the right left both sides that 22R is arranged on driver's seat 21, pair of right and left

manual lever

23L, 23R and pedal 24L, the 23R of the usefulness of travelling are arranged on the floor in driver's seat 23 the place aheads.

In addition, because illustrated hydraulic crawler excavator is the rocker arm mini-excavator of 6 tons of less thaies, so the area that is provided with of casing 6 has occupied major part on the rotary frame 5.Promptly; casing 6 is configured to: above rotary frame 5; be positioned at and occupied the part of assigning to the rear part (the rear part of sidepiece containment vessel 8a and rear portion containment vessel 8b) of containment vessel 8 from the front part of rotary frame 5, and the driver's seats 21 in the casing 6 are positioned at the top of Machine Room 9.

In addition, casing 6 has the door 32 that chassis body 31 and boarding are used, chassis body 31 be formed have go up face, front face, rear face and about the box-shaped of side surface part.Among the figure, to the left side face of chassis body 31 (below, it is facial to be called the casing left side rightly) label symbol 36, door 32 is installed in rotation on the intermediate studdle 39 in casing left side facial 36 by linkage 41a, 41b.In addition, face, front face, rear face, left and right sides face and door 32 are provided with glass window on the chassis body 31, can guarantee to ride in the visual field of the driver in the casing.Among the figure, to being arranged on the glass window label symbol 38a on the casing left side facial 36, to being arranged on glass window label symbol 38b, 38c, the 38d on the door 32.What be equipped with on the front side leg portion 42 in casing left side facial 36 that boarding uses holds up bar 73, and the handrail of using as the boarding of the characteristic of present embodiment 43 is installed on the intermediate studdle 39 in casing left side facial 36.

Describe handrail 43 in detail according to Fig. 3-Fig. 5.Fig. 3 is the enlarged drawing in casing left side facial 36, and Fig. 4 (a)-(c) is A-A line, the B-B line along Fig. 3, the sectional view of C-C line, and Fig. 5 is the amplification stereogram of handrail 43.In addition, in Fig. 4 (a)-Fig. 4 (c), represent the state of door 32 after opening with imaginary line.

In Fig. 3, the door 32 that boarding is used is the folding doors that are made of the 32a of former and later two, 32b, and the rearframe part 44 of rear door portion 32b is installed in rotation on the intermediate studdle 39 by linkage 41a, 41b.The rearframe part 44 of rear door portion 32b is except handrail 43 residing parts, be rectilinear form at above-below direction on the whole, handrail 43 residing parts are (illustrated left side) depression slightly to the inside, and its outside (illustrated right side) forms the recess 44a that handrail is installed usefulness.In addition, intermediate studdle 39 is installed near the central authorities of width (illustrated left and right directions) of the left side face 36 of chassis body 31, handrail 43 is installed in the height and position of the regulation of intermediate studdle 39, in illustrated example, is installed in the upside slightly of the short transverse middle position of intermediate studdle 39.

Shown in Fig. 4 (a)-Fig. 4 (c), the rearframe part 44 of rear door portion 32b is made of the outside and inboard two

steel sheet components

45,46, the steel sheet component 45 in the outside is an even shape, inboard steel sheet component 46 has the protuberance 46a that extends along the vertical direction and form, by with both combinations, form the frame structure of hollow.In addition, on the steel sheet component 45 in the outside, glass window 38d is installed.Intermediate studdle 39 also is to be made of the outside and inboard two

steel sheet components

47,48, the steel sheet component 47 in the outside has that other parts except that the part of the recess 44a that is positioned at rearframe part 44 are extended along the vertical direction and the protuberance 47a that forms, inboard steel sheet component 48 has the protuberance 48a that extends along the vertical direction and form in its length range, be the support construction of hollow by other parts that both combinations are formed except that the part of the recess 44a that is positioned at rearframe part 4.The part of the recess 44a of the steel sheet component 48 outside being positioned at is an even shape, is formed for installing the handrail installed surface 49 of handrail 43 on this part.

Shown in the imaginary line of Fig. 4 (c), handrail 43 is mounted to after door 32 is opened and can be controlled under the state outstanding laterally from the external surface of the intermediate studdle 39 of the external surface that constitutes chassis body 31.In addition, handrail 43 be along the collecting position (solid line of Fig. 4 (c)) of the external surface (external surface of intermediate studdle 39) of chassis body 31 and from the external surface (outside of intermediate studdle 39) of chassis body 31 outstanding laterally control the stowable that can rotate between the position (imaginary line of Fig. 4 (c)), by handrail 43 is housed in collecting position, can be housed in the position of comparing more close inboard with the external surface of door 32 at least in part.In addition, under door 32 closing state, make handrail 43 turn to the position of controlling shown in Fig. 4 (c) imaginary line, also can control handrail 43 from the outside.

The detailed construction of handrail 43 is described according to Fig. 5.As shown in Figure 5, handrail 43 is as the part of handrail assembly 51 and constitute.Handrail assembly 51 has: the substrate 52 of steel plate system, on the handrail installed surface 49 of its steel sheet component 47 by being bolted to the outside that is formed at intermediate studdle 39; A pair of carriage 53a, 53b, its by the welding or screw on this substrate 52; And the axle 54 of control, it is run through is supported on this a pair of carriage 53a, 53b.Handrail 43 is installed in rotation on this axle 54.

Handrail 43 has: the grip 55 of control; Be installed in the end plate member 56,57 of steel plate system at the two ends of this grip 55; And the rotation installing component 58,59 of end of a relative side that is installed in the grip 55 of end plate member 56,57.The rotation installing component 58 of end plate member 56 sides is by meeting at right angles with end plate member 56 and wait the duct member become one to constitute by welding, and this duct member rotatably is inserted into the part of giving prominence to from carriage 53a of axle 54.The rotation installing component 59 of end plate member 57 sides has: the duct member 61 from the outstanding part of carriage 53b that rotatably is inserted into axle 54; The web 62 of the steel plate system that meets at right angles with the axle side end opposite side of this duct member 61 and become one by welding etc.Web 62 by screw removably screw thread be fixed on the end plate member 57.Package has helical spring 63 on the part of giving prominence to from carriage 53a of axle 54, one end of helical spring 63 is installed in outstanding being arranged on the plate member 64 of carriage 53a, and the other end of helical spring 63 is installed on the plate member 65 of giving prominence to the duct member that is arranged at rotation installing component 58.Helical spring 63 is to the compression spring that suppresses along the collecting position side of illustrated intermediate studdle external surface with handrail 43.Also can be in the duct member 61 of substrate 52 and the rotation duct member of installing component 58 and substrate 52 and rotation installing component 59 between at least one, handrail 43 from middle pillar external surface outstanding laterally control the position, prevention is set revolves from illustrated collecting position and turn 90 degrees above block.

If the operator pulls to body the place ahead the grip 55 of handrail 43 with hand to (lateral direction of intermediate studdle external surface), then handrail 43 with the position relative with grip 55 promptly axle 54 be the center rotation.These handrail 43 common power because of helical spring 63 are in the illustrated collecting position of swinging to intermediate studdle 39 sides, and do not give prominence to from middle pillar 39.The door 32 of opening casing 6 the operator is held the grip 55 of handrail 43 when entering casing 6, makes the lateral direction of handrail 43 to intermediate studdle 39, for example rotates 90 degree.At this moment, because handrail 43 is not outstanding to open the door opening portion side (boarding space side) that the back forms at door 32, but direction is outstanding laterally from the external surface of middle pillar 39, so the boarding space can not become narrow because of handrail 43.The operator holds up bar 73 by catching handrail 43 of the present invention and being arranged on the left front leg portion 42 of casing, can successfully enter in the casing 6.If operator's hand leaves handrail 43, then handrail 43 turns back to original collecting position, can be not outstanding from the surface of casing.

In addition, even under door 32 closing state, also can by make handrail 43 in Fig. 4 (c) shown in the imaginary line control rotated position and from outside grasp handrail 43, so for example climb up under the situation about also moving on the crawler belt of bottom driving body 1 the operator, can control this handrail 43 and move safely, thereby under door 32 closed conditions, also can utilize handrail 43.

According to above-mentioned present embodiment, because be make handrail 43 that boarding uses compare with the external surface of door 32 more close inboard and along the collecting position of the external surface of chassis body 31 and from the external surface of chassis body 31 outstanding control the intake type that can rotate between the position, so the operator can hold handrail 43 and enter in the casing 6, and handrail 43 can not make the boarding space become narrow, operator's shoulder can not run into handrail 43 and just can successfully enter in the casing 6 from the boarding space, and has guaranteed the operation in the excellence of stenosis.In addition, because can under door 32 closing state, utilize handrail 43, also increased the convenience of handrail 43.

According to Fig. 6 and Fig. 7 other embodiment of the present invention is described.In the first embodiment, handrail is rotating intake type, and in the present embodiment, handrail is fixed.In the drawings, to Fig. 3 and Fig. 4 in the identical symbol of corresponding parts mark.

In Fig. 6, the door 132 that boarding is used is installed in rotation on the intermediate studdle 139 in casing left side facial 136 by linkage 41a, 41b.On the intermediate studdle 139 in casing left side facial 136, the fixed handrail 143 as the characteristic of present embodiment is installed.The door 132 that boarding is used has front door portion 132a and rear door portion 132b, the rearframe part 144 of rear door portion 132b is identical with first embodiment, except handrail 143 residing parts, be rectilinear form at above-below direction on the whole, handrail 143 residing parts cave in slightly to the inside, form the recess 144a that handrail is installed usefulness in its outside.In addition, in the present embodiment, on intermediate studdle 139, on the position corresponding, also form to the handrail of the inboard depression of operating room the recess 149 of usefulness is installed with the recess 144a of rearframe part 144.

Promptly, shown in Fig. 7 (a)-Fig. 7 (c), the rearframe part 144 of rear door portion 132b is made of the outside and inboard two steel sheet components 145,146, the steel sheet component 145 in the outside is an even shape, inboard steel sheet component 146 has the protuberance 146a that extends along the vertical direction and form, by both combinations being formed the frame structure of hollow.In addition, on the steel sheet component 145 in the outside, glass window 38d is installed.Intermediate studdle 139 also is to be made of the outside and inboard two steel sheet components 147,148, the steel sheet component 147 in the outside has the protuberance 147a that extends along the vertical direction and form, inboard steel sheet component 148 has the protuberance 148a that extends along the vertical direction and form on its total length, by both combinations being formed the support construction of hollow.Said structure is identical with first embodiment.

In addition, in the present embodiment, the steel sheet component 147,148 of intermediate studdle 139 makes the cross sectional shape that contains protuberance 147a, 148a be abnormity, and is formed with recess 149 in this part in the part corresponding with the recess 144a of rearframe part 144.

Promptly, the steel sheet component 147 of intermediate studdle 139,148 at protuberance 147a, the both sides of 148a, the junction plate part 147b1 that has the contact of mutual face and become one by welding etc., 147b2,148b1,148b2, these junction plate parts are as Fig. 7 (a) and (b), part beyond in the position corresponding with the recess 144a of rearframe part 144, be positioned on the same plane, and in the part corresponding with recess 144a, shown in Fig. 7 (c), the junction plate part 147b1 in diagram left side (reveal or rearframe part side), 148b1 is positioned at the indoor that enters casing 6, and, the reveal partial width of the protuberance 147a of the steel sheet component 147 by making this part narrows down, make this junction plate part 147b1, the 148b1 width increases, and forms the recess 149 that handrail is installed usefulness in this part.In addition, in the rearframe part 144 of rear door portion 132b, with the displacement of the recess 149 of junction plate part 147b1,148b1 accordingly, the height of protuberance 146a that makes inboard steel sheet component 146 is kept small gap at the part of the recess 144a part height than other between the rearframe part 144 of intermediate studdle 139 and rear door portion 132b.

Handrail 143 is the parts that tubing are flexed into the コ font, the 143b of foot, 143c (only illustrating one) with grip 143a and its two ends, the front end of the 143b of foot, 143c are installed in by welding or bolt on the bottom surface of recess 149 of intermediate studdle 139.

Like this handrail 143 is installed in the recess 149 of the installation door usefulness that is arranged on the intermediate studdle 139, even handrail 143 is fixed thus, also can under the state outstanding laterally, control from the external surface of chassis body 31, and, can (being the whole of handrail 143 in the illustrated embodiment) be housed in the position of comparing more close inboard with the external surface (external surface of glass window 38d) of door 132 at least in part.In view of the above, in the present embodiment, also can obtain the effect identical with first embodiment.That is, the operator opens door 132, holds handrail 143 and enters in the casing 6, and handrail 143 can not make the boarding space become narrow, operator's shoulder can not run into handrail 143, can successfully enter in the casing 6 from the boarding space, and guarantee operation in the narrow excellence.In addition, because can under door 132 closing state, utilize handrail 143, increased the convenience of handrail 143.

In addition, in the above-described embodiment, door be by former and later two ones constitute collapsible, the door of being arranged to single fan also can obtain same effect.

In addition, in the above-described embodiment, its structure is when being in the state of controlling handrail 143, and handrail 143 is only outstanding, not side-prominent to the boarding space fully laterally from the external surface of chassis body 31, but, also can be that handrail 143 is more side-prominent to the boarding space, even in this case when being in the state of controlling handrail 143, if its overhang is lacked the easy degree that enters casing that also can improve then compared with the past than the overhang of in the past handrail.

Claims

1. engineering machinery comprises the casing with door that chassis body and boarding use, by linkage above-mentioned door is installed in rotation on the intermediate studdle of said machine casing main body,

It is characterized in that, on above-mentioned intermediate studdle, be provided with the handrail that boarding is used, this handrail is mounted to and can be controlled under the state outstanding laterally from the external surface of said machine casing main body, and above-mentioned handrail can be housed at least in part the position of comparing more close inboard with the external surface of above-mentioned door.

2. engineering machinery, it has bottom driving body and upper rotating body, and upper rotating body comprises: the rotary frame with formation base infrastructure; Be arranged on this rotary frame, and have the casing of driver's seat; Be arranged on the counterweight at the rear portion on the above-mentioned rotary frame; Cover the part beyond casing on the above-mentioned rotary frame and the counterweight, and partial interior forms the containment vessel of Machine Room in the wings;

Said machine casing is configured to: above above-mentioned rotary frame, be positioned at and occupy the part of assigning to the rear part of above-mentioned containment vessel from the front part of above-mentioned rotary frame, and the driver's seat in the said machine casing is positioned at the top of above-mentioned Machine Room;

Said machine casing has the door that chassis body and boarding are used, by linkage above-mentioned door is installed in rotation on the intermediate studdle of said machine casing main body,

3. engineering machinery as claimed in claim 1 or 2 is characterized in that,

Above-mentioned handrail be can compare with the external surface of above-mentioned door more close inboard along the collecting position of the external surface of said machine casing main body and from the external surface of said machine casing main body outstanding control the intake type handrail that rotates between the position.

4. engineering machinery as claimed in claim 1 or 2 is characterized in that,

Above-mentioned handrail is to be installed in the door that is arranged on the above-mentioned intermediate studdle to install with the fixed handrail in the recess.