JP4360200B2 - Drug spraying equipment for mobile agricultural machines - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined implement capable of effectively spraying a chemical to crops by setting a controlling and spraying apparatus to an adequate position to a rear implement according to growth of crops. <P>SOLUTION: A culti-rotary (27) for carrying out weeding operation is liftably connected to the rear of a machine body of a mobile agricultural machine and a rear boom (11d) for spraying the chemical over tilling width is arranged behind the culti-rotary (27). The rear boom (11d) is constituted vertically and horizontally adjustably to the culti-rotary (27) according to growth conditions of crops and the size of the implement. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

  The present invention relates to a medicine spraying device for a mobile agricultural machine, and more particularly to a device for simultaneously performing middle tillage work and spraying work.

Conventionally, what connected the medicine spraying device to the rear part of a traveling machine body so that raising and lowering was possible is known (patent documents 1). Moreover, what equipped the tillage working machine to the rear part of the body is also known (patent document 2).
Japanese Patent Laid-Open No. 7-15519 Japanese Patent Laid-Open No. 8-130906

  The device of Patent Document 1 is configured such that a hitch is connected to a rear portion of a traveling machine body so that the hitch can be moved up and down, a drug spraying device is fixedly attached to a predetermined position of the hitch, and the hitch is moved up and down to raise and lower the drug spraying device. When the chemical spraying device configured in this way is directly attached to the rear working machine connected to the rear part of the traveling machine body and the work is combined, the chemical is effectively applied from the initial growth stage to the late growth stage of the crop. A problem that spraying is not possible occurs. That is, there is a problem that the medicine does not reach the crop or the soil depending on the height of the crop, and if the type of the cultivating machine is changed, the spraying device cannot be attached satisfactorily.

  Therefore, the present invention eliminates such problems by attaching the drug spraying device to the rear working machine so that it can be adjusted up and down and back and forth, and effectively spreads the drug from the initial growth stage to the late growth stage. It is intended to provide a multi-function machine that can be used.

  In order to solve the above problems, the present invention has taken the following technical means.

In the invention of claim 1, a central boom (11a) capable of spraying a chemical solution is provided in front of the traveling chassis (2) of the mobile agricultural machine (1), and left and right side booms (11b) are provided on both left and right sides of the central boom (11a). ) And the right side boom (11c), and the left side boom (11b) and the right side boom (11c) are moved up and down and opened and closed in the inside and outside directions, so that the storage posture is substantially along the side surface of the body. A chemical tank (9) for storing a medicine so as to be able to be changed to a spraying work posture projecting to the left and right sides, and to enclose the left and right sides and the rear side of the rear seat (7) of the traveling chassis (2). A recessed portion (9d) cut in the vertical direction is formed in the rear central portion of the rear portion (9c) of the chemical solution tank (9), and a rear working machine ( 27) connected vertically movably, the rear working machine (27) Disposed boom (11d) after that can spray the drug over a working width backwards, adjustably configured vertically and back and forth relative to the rear working machine (27) and rear booms (11d), the rear work The machine (27) is composed of a center rotary (30) at the center and left and right side rotary (31, 32) located on the left and right sides of the center rotary (30), and the left and right side rotary (31, 32). ) Is configured to be movable in the left-right direction, and further, the rear boom (11d) is configured to be approximately the same width as the rear work machine (27), and is a medicine spraying device for a mobile farm machine.

According to the above configuration, the left side boom 11b and the right side boom 11c are turned up and down and opened and closed in the inside and outside directions, so that the storage posture is substantially along the side of the fuselage, or the spraying work posture protrudes to the left and right sides. Change to
The chemical liquid tank (9) surrounding the left and right sides and the rear side of the seat 7 is detachable.
For example, middle tilling work can be performed on the rear of the machine body of the mobile farming machine by a rear working machine, and chemical work can be sprayed from the rear boom 11d over the middle tilling width to perform combined work.
The work implement 27 is composed of a center rotary 30 at the center and left and right side rotary 31 and 32 located on both the left and right sides of the center rotary 30. The left and right rotary 31 and 32 are arranged in the left and right direction. Moving.

The invention of claim 1 can spread the drug over the working width and infiltrate the drug deeply into the soil to enhance the spraying effect. Further, the rear boom 11d disposed behind the rear work machine is used as a crop growth stage. By adjusting according to the size of the working machine to be attached or up and down and back and forth, it is possible to efficiently spread the drug on the crop while avoiding the spraying of the drug to the rear working machine.
Moreover, since the recessed part 9d cut out in the up-down direction was provided in the rear center part of the chemical | medical solution tank 9, a back work machine, a link, etc. can enter the recessed part 9d, and can raise. Thereby, since the lift amount of the post-work machine 27 can be ensured, it becomes possible to prevent crop damage during turning. Further, the operator has a good rear view through the concave portion 9d of the chemical tank 9, and the work confirmation of the post-work machine 27 is facilitated.

  In the present invention, a rear working machine is connected to the rear part of the mobile agricultural machine so as to be movable up and down, and a rear boom 11d capable of spraying a medicine over the entire working width is disposed behind the rear working machine. It is configured to be adjustable up and down and back and forth with respect to the working machine, and attempts to spread the chemicals effectively on the crop according to the degree of growth of the crop while performing complex work.

  1 to 3 show a riding management machine 1 having a rear boom 11d according to the present invention. The overall configuration of the passenger management machine 1 will be described below.

  Front and rear wheels 3, 3 and rear wheels 4, 4 having the same diameter are provided on the front, rear, left and right of the traveling chassis 2 of the passenger management machine 1, and a control spray device A is disposed at the rear of the traveling chassis 2. An engine is mounted between the left and right front wheels 3 and 3, and the engine periphery is covered with a bonnet 6. A seat 7 is provided at the front and rear intermediate portion of the traveling chassis 2. A steering handle 8 is provided so as to be positioned in front of the seat 7. When the handle 8 is steered left and right, the left and right front wheels 3, 3 and the rear wheel In this configuration, four and four wheels are steered simultaneously. Further, around the seat 7 at the rear of the traveling chassis 2, a chemical tank 9 for storing a medicine is detachably provided so as to surround the left and right sides and the rear side thereof.

  Further, traveling power is transmitted from the engine output shaft to the front wheels 3 and 3 and the rear wheels 4 and 4 via a traveling transmission device (not shown), and the chemical spray is transmitted from the engine output shaft to the working machine transmission device. The working power is transmitted to the pump for driving and the PTO shaft for driving the rear working machine.

  The lower water supply port of the chemical liquid tank 9 is communicated with the pump, and the chemical liquid discharged from the pump is sent to the pressure adjusting device via the pressure pipe, and the pressure is adjusted by the pressure adjusting device. Are branched and sent to a plurality of high pressure hoses, and further sent to the central boom 11a, the left side boom 11b, the right side boom 11c and the rear boom 11d via the intermediate hose 38, and the chemical solution is sprayed from the spray nozzles 14,. It is the composition to be spread. In the present invention, the central boom 11a is removed and attached to the rear portion of the vehicle body as will be described later.

  In addition, a boom support member 15 is attached to the front of the traveling chassis 2 by upper links 18a and 18a and lower links 18b and 18b so as to be movable up and down, and the entire structure is moved up and down by lift cylinders 19 and 19. . Further, the left and right intermediate portions of the central boom 11a are supported by the boom support member 15 so as to be able to adjust the rolling around the axial center in the front-rear direction, and the horizontal cylinder 20 performs the rolling adjustment.

  Further, at the both ends of the frame portion of the central boom 11a attached to the boom supporting member 15, the base end portions of the left side boom 11b and the right side boom 11c are pivotally supported around the lateral pins, and the left and right lifting cylinders 16 are supported. 16, the left side boom 11 b and the right side boom 11 c are configured to rotate up and down. Further, the frame bases of the left side boom 11b and the right side boom 11c are pivotally supported around a vertical pin, and the left side boom 11b and the right side boom 11c can be opened and closed in an inward / outward direction by the open / close cylinders 17 and 17. is doing.

  Thus, the left side boom 11b and the right side boom 11c are turned up and down, and opened and closed in the inside and outside directions, so that the left side boom 11b and the right side boom 11c are opened and closed in the inner and outer directions. can do.

  The left side boom 11 b and the right side boom 11 c move in the longitudinal direction to the left and right side frames 39, the fixed boom 40 fixed in a fixed state, for example, inside the left and right side frames 39, and the outside of the left and right side frames 39. The movable boom 41 is mounted so as to be adjustable. The movable boom 41 can be expanded and contracted by the telescopic motors 21 and 21 so that the movable boom 41 can be changed between a short spraying state and a long spraying state.

  The tank shape of the chemical liquid tank 9 is such that the left and right portions 9a and 9b located on the left and right sides and the rear side of the seat 7 in plan view and the rear portion connecting the rear side portions of the left and right portions 9a and 9b. 9c and having a predetermined width and height. The rear portion 9c is formed with a recessed portion 9d cut in the vertical direction at the rear center portion thereof, provided with left and right replenishing ports 22 and 22 on the left and right side portions of the chemical liquid tank 9, and the left and right replenishing ports 22 and 22 being left and right open / close lids. 23 and 23 are configured to open and close.

  Further, the rear end of the traveling chassis 2 is pin-coupled to the front end of the rear lifting link 25 refracted in a side view, and the rear end of the rear lifting cylinder (not shown) is pin-coupled to the rear of the traveling chassis 2. Then, the front end portion of the rear lifting cylinder is pin-connected to the middle portion of the rear lifting link 25, and the multi-rotary 27 connected to the rear portion of the rear lifting link 25 is moved up and down. Note that a PTO shaft is provided at the rear portion of the traveling chassis 2, and power is transmitted to the multi-rotary 27 via a coaxially refracting transmission shaft.

  Further, as shown in FIG. 4, the multi-rotary 27 is, for example, a triple tiller working machine that performs weeding of leafy vegetables crops and soiling work, and is configured as follows.

  A transmission box 28 to which power is transmitted from the PTO shaft is provided at an intermediate portion in the left-right direction, and a cultivation support frame 29 is provided at the rear portion of the transmission box 28 along the left-right direction. A rotary 30 is attached, and left and right side rotary parts 31 and 32 are attached to the left and right side parts of the culturing support frame 29 so as to be movable in the left and right direction.

  The center rotary 30 and the left and right side rotary parts 31 and 32 include a rotary transmission case 33, a cultivating device 34 provided at the lower part of the rotary transmission case 33, a cultivating frame 35 attached to a midway part of the rotary transmission case 33, and a cultivating claw 34, and the like.

  Further, the left and right work transmission shafts are extended from the transmission box 28 so as to be positioned in the culturing support frame 29, and the left and right work transmission shafts, the center rotary 30 and the rotary transmission cases 33, 33 of the left and right side rotary members 31, 32 are extended. The input gear is spline-fitted, power is transmitted from the left and right work transmission shaft to the rotary transmission case 33, and the tilling claws 34,... Of the center rotary 30 and the left and right side rotary parts 31, 32 are driven. Yes.

  Thus, while carrying out the chemical spraying operation by the control spray device A with the chemical liquid tank 9 attached, a combined work of middle tillage weeding work by the cultivator 27 is possible, and the work efficiency can be improved. Further, since the recessed portion 9d cut in the vertical direction is provided in the rear center portion of the chemical liquid tank 9, the rear lifting link 25 and the cultivator 27 can be moved up into the recessed portion 9d and lifted. The amount can be secured to prevent crop damage during turning. Further, the operator has a good rear view through the concave portion 9d of the chemical tank 9, and the work confirmation of the multi-rotary 27 becomes easy.

  Next, the rear boom 11d will be described with reference to FIG.

A vertical support cylinder 42 is pivotally supported by left and right pins 43, 43 at the rear portion of the tilling frame 35 in the center rotary 30, and a vertical stay 44 is inserted into and supported by the support cylinder 42. A mounting stay 45 in the front-rear direction that is parallel to the ground is fixed to the upper end of the bolt with a bolt and a nut. A mounting portion of the rear boom 11d is inserted into the rear end portion of the mounting stay 45 from the rear side, and is mounted so as to be adjustable in the front-rear direction with bolts and nuts. Then, the rear boom 11d is configured substantially the same width as the row crop rotary 27, and the rear boom 11d to allow spraying an agent across the full width after Intertillage of Karuchirota Li 27. A rear hitch 46 of the multi-rotary 27 is provided at the center of the left and right sides, the rear hitch 46 and the mounting stay 45 are connected by a rod 47, and the rear hitch 46 is configured to be adjustable up and down by a vertical adjustment device 48.

  Thus, it is possible to perform a combined work of spraying the herbicide from the rear boom 11d after the middle tillage work by the cultivator 27, and to increase the herbicidal effect by penetrating the herbicide deeply into the soil. Further, the rear boom 11d can be adjusted in the vertical direction and the front-rear direction with respect to the cultivator 27, and the rear boom 11d can be adjusted according to the growth of the crops to enhance the effect of spraying the medicine.

  Moreover, it is good also as a structure which provides the fertilizer applicator 49 above the culture rotary 27 as shown in FIG. That is, a fertilizer application 49 is attached to the rear hitch 46 of the cultivator 27 via a fertilization frame 50, and a fertilization tank 51 is provided above the fertilizer application 49. Thus, when the feed roller (not shown) of the fertilizer application device 49 is driven by the fertilizer motor 52, the fertilizer in the fertilizer tank 51 is fed by the feed roller (not shown) and fertilized on the field through the fertilizer pipes 53,. The

  The center of gravity G1 in the front-rear direction of the multi-rotary 27 is set at the position shown in the figure, and the center of gravity G2 in the front-rear direction of the fertilizer 49 attached to the multi-rotary 27 is positioned forward of the center of gravity G1 of the multi-rotary 27. Yes. Thus, even if fertilizer is introduced into the fertilizer tank 51, the center of gravity moves rearward of the machine body, and the working angle of the tilling device 34 and the cultivating board 54 is stabilized regardless of the increase or decrease of the fertilizer, thereby improving the work accuracy. Can be made.

  The fertilizer motor 52 is turned on and off by an up-stop switch 55. A chain 57 with a spring 56 is connected to the rear part of the riding management machine 1, and the rear end of the chain 57 is connected to the up-stop switch. 55 is linked. In addition, a fertilization drive switch 58 for turning on / off the electric circuit of the up-stop switch 55 is provided in the vicinity of the seat 7 of the riding management machine 1 and is configured to be turned on / off by the on / off arm 59. The clutch pedal 60 and the on / off arm 59 of the machine 1 are linked via an interlocking rod 61.

  Therefore, when the clutch pedal 60 of the vehicle is released, the switch is turned on and the fertilizer driving switch 58 is turned on, the electrical circuit of the upstop switch 55 is closed, and when the upstop switch 55 is turned on, the fertilizer motor 52 is turned on. Driven. When the clutch pedal 60 is depressed and turned off, the electrical circuit of the upstop switch 55 is opened, and the fertilizer motor 52 is not driven even when the upstop switch 55 is turned on.

  When the rear lifting link 25 is lowered and the tilling claw 34 of the cultivator 27 is rotated, the chain 57 with the spring 56 is tensioned, the up-stop switch 55 is turned on, and the fertilizer motor 52 is driven to fertilize. Is done. Further, when the rear elevating link 25 is raised and the cultivator 27 is raised to the non-working position, the chain 57 with the spring 56 is loosened, the up-stop switch 55 is turned off, the fertilizer motor 52 is stopped, and the fertilizer 49 is stopped. Further, during these operations, when the clutch pedal 60 is stepped on and the power of the traveling system is turned off to operate the riding management machine 1 to stop traveling, the driving of the fertilizer motor 52 is stopped and the fertilizer motor 52 of the fertilizer device 49 is stopped. Is also stopped.

  In the conventional apparatus, when the traveling of the riding management machine 1 is stopped and the fertilizer applying device 49 is stopped, it is necessary to turn off the traveling clutch of the riding management machine 1 and to separately turn off the fertilizer driving switch. There is a problem that if the switch operation is forgotten, the fertilizer is fed from the fertilizer and the fertilizer is wasted. However, by adopting the above-described configuration, it is possible to prevent unnecessarily fertilizer feeding while improving operability.

  Next, the support structure of the front wheels 3 and 3 and the rear wheels 4 and 4 will be described with reference to FIG.

  Hereinafter, the mounting configuration of the right front wheel 3 will be described. The front wheel axle case 62 is configured in a reverse U shape when viewed from the front, and the right lower end 62a of the front wheel axle case 62 extends obliquely downward to the right. A mounting cylinder 63a is provided on the inner upper portion of the right front wheel case 63 so as to extend obliquely upward on the inner side. The axle 64 is mounted on the right front wheel case 63, and the right front wheel 3 is disposed on the outer protruding portion of the axle 64. Is attached. The right front wheel case 63 configured as described above is rotatably fitted to and supported by the right lower end 62a of the front wheel axle case 62 via a bearing, and the front wheel transmission shaft 65 on the front wheel axle case 62 side is connected to the bevel gear 66 and the right front wheel case. The power is transmitted to the right front wheels 3 and 3 through the bevel gear 67 on the 63 side and the right axle 64. The left front wheel 3 and the rear wheels 4 and 4 have the same configuration.

  As shown in FIG. 6 (B), the conventional device comprises a mounting portion 63a at the inner lower part of the right front wheel case 63, and the mounting portion 63a of the right front wheel case 63 is bolted to the right lower end 62a of the front wheel axle case 62. It is a configuration to attach. Therefore, in a working state in which the left and right side booms 11b and 11c protrude from the passenger management machine 1 to the left and right, a compressive force acts in the longitudinal direction of the front wheel transmission shaft 65 via the right lower end 62a of the front wheel axle case 62, and the right front wheel 3 acts on the lower surface. At that time, the force acting on the lower surface of the front wheel through the lower part of the right front wheel case 63 is received with a short left and right width B as shown in FIG. .

  However, with the configuration as shown in FIG. 6A, when a compressive force acts in the longitudinal direction of the front wheel transmission shaft 65 via the right lower end 62a of the front wheel axle case 62, Since it acts on the lower surface of the front wheel 3 via the upper part of the right axle 64 of the front wheel case 63, it is received with a wide width A on the left and right, and the stress is distributed, so that the durability of the axle 64 can be improved.

  Next, with reference to FIG. 7, the weed folds attached to the front wheel 3 will be described.

  A wheel case 69 around which the front wheel 3 is pivotally mounted has a base portion of a substantially V-shaped weed ridge 70 covering the periphery of the front portion of the tire rotated around a bolt 71 so that it can be positioned freely. Yes. In addition, the weed weed 70 is divided into an inner weed 70 a and an outer weed 70 b, and this connection part is pivotally connected to each other by a pin 72. The collar 70 is rotated inward and outward, and is fixed by a width adjusting means 73 having a positioning hole 73a for a wide tread and a positioning hole 73b for a narrow tread.

  Thus, as shown by the solid line, when the boss portion of the front wheel 3 is attached to the attachment portion 64a outside the axle 64 to form a wide tread, the width adjusting means 73 is adjusted to the wide state, and As shown by a solid line, the width 70 is widened to cover the front side of the front wheel 3 to prevent the crops from being caught in the wheel 68. On the other hand, as shown in phantom lines, when the boss portion of the front wheel 3 is attached to the mounting portion 64b on the inner side of the axle 64 and the tread has a narrow width, the bolt 71 for attaching the weed rod 70 is loosened and the front wheel 3 is The position is adjusted to a narrow position, the width adjusting means 73 is set in a narrow state, and the weed fold 70 is fixed to the wheel case 69 with a bolt 71.

  When the front wheel 3 is to be removed, the outer weed cage 70 is removed from the width adjusting means 73, and the outer weed cage 70 is rotated around the pin 72 to the outside with respect to the inner weed bush 70a. Open. Then, the front wheel 3 can be removed from the wheel case 69 while the weed fold 70 is attached to the wheel case 69.

  In addition, you may attach the said weeding apparatus to the rear wheel 4 similarly.

It will now be described mounting structure of the axle case 62 for supporting the front and rear wheels 3, 4 on the basis of FIGS. 8-9. In the vehicle, since the front and rear axle cases have a common form, the front axle case that supports the front wheels 3 will be described.

  A front axle case 62 is attached to the lower side of the frame 74 along the front-rear direction of the riding management machine 1 so as to be swingable around the center pivot 75, and the front axle case 62 is configured in a front view portal type. Left and right front wheel cases (not shown) are attached to both ends of the wheel so as to be steerable.

  Left and right support plates 76 and 76 (the left support plate is not shown) are attached to the left and right sides of the front frame 74 so as to be positioned above the front axle case 62. The left and right support plates 76, 76 are configured to be long in the front-rear direction and positioned in the front-rear direction of the front axle case 62, and a concave portion 76a is formed in the front-rear intermediate portion by notching a facing portion in the upper portion of the front axle case 62. The front and rear end portions 76b and 76c are configured to protrude downward in front of and behind 76a. The front and rear end portions 76b and 76c are configured to contact front and rear abutting plates 77 and 78 attached to the front and rear portions of the front axle case 62 with bolts and nuts.

  Left and right side plates 79 and 79 (the left side plate is not shown) are extended outward from the left and right support plates 76 and 76, and elastic members 80 are disposed on the upper and lower surfaces of the left and right side plates 79 and 79. An adjustment bolt 82 is inserted into and supported by the elastic member 80 and the left and right side plates 79, 79, and the adjustment bolt 82 is adjusted so that the elastic coefficient of the elastic member 80 can be adjusted.

  A reinforcing plate 83 is attached to the upper surface of the central portion of the front axle case 62 with bolts, and left and right vertical plates 84 and 84 raised from the left and right sides of the reinforcing plate 83 are in contact with the inside of the front frames 74 and 74. Oppositely arranged so as to approach each other, receiving plates 85 and 85 that can be vertically adjusted by bolts and nuts are attached to the upper surfaces of the left and right sides of the front axle case 62, and the upper surfaces of the receiving plates 85 and 85 are attached to the left and right side plates 79 and 79, respectively. The front axle case 62 is configured to suppress swinging around the center pivot 50 by contacting or approaching the lower surface of the elastic member 80 on the side.

  Therefore, even when the left and right front wheels 3 and 3 of the riding management machine 1 travel on the uneven portion, the swinging shock of the front axle case 62 is absorbed and relaxed by the elastic material 80, improving the ride comfort of the operator, Shake can be reduced and spraying performance can be improved. Also, the left and right support plates 76, 76 are lengthened in the front-rear direction, and the front and rear abutment plates 77, 78 on the front axle case 62 side are placed close to each other. Since the left and right vertical plates 84 and 84 on the axle case 62 side are arranged to contact each other, the front frame passes through the receiving plates 85 and 85, the elastic member 80, the left and right side plates 79 and 79 from the front axle case 62. The load applied to the left and right support plates 76 on the 74 side is dispersed, and durability can be improved.

The whole side view of a passenger management machine. The whole top view of a passenger management machine. The rear view of a passenger management machine. The side view of a rear work part. The side view of the passenger management machine which shows another form. (A) The cut rear view of the axle case of this riding management machine. (B) The cut rear view of the conventional axle case. The top view which shows the weed ridge attached to an axle case part. The partially cut back view which shows the attaching part of a front axle case. The partial side view which shows the attaching part of a front axle ha case.

Explanation of symbols

A Control spraying equipment 1 Mobile farm machine (Riding management machine)
2 Car chassis 7 Seat 9 Chemical tank
9c rear part
9d recess 11a center boom 11b left side boom 11c right side boom 11d rear boom 14 spray nozzle
22 Supply port 27 Cultivator (rear work machine)
25 Rear lifting link
30 center rotary
31 Left side rotary
32 right side rotary 46 rear hitch 48 vertical adjustment device

Claims (1)

A central boom (11a) capable of spraying a chemical solution is provided in front of the traveling chassis (2) of the mobile agricultural machine (1), and a left side boom (11b) and a right side boom (11c) are provided on both sides of the central boom (11a). ), And the left side boom (11b) and the right side boom (11c) are pivoted up and down and opened and closed in the inside and outside directions, so that the storage posture is substantially along the side of the fuselage and protrudes to the left and right sides. A chemical solution tank (9) configured to be able to be changed to a spraying work posture and containing a medicine so as to surround both the left and right sides and the rear side of the rear seat (7) of the traveling chassis (2) is detachably provided. The rear part (9c) of the rear part (9c) of the tank (9) has a recessed part (9d) cut in the vertical direction, and the rear working machine (27) is connected to the rear part of the mobile agricultural machine (1) so as to be movable up and down. and, to the working width in the rear of the rear working machine (27) Ri disposed boom (11d) after that can spray the drug adjustably constructed vertically and back and forth relative to the rear boom (11d) of the rear work machine (27), a rear working machine (27) Is composed of a center rotary (30) at the center and left and right side rotary (31, 32) located on both left and right sides of the center rotary (30), and the left and right side rotary (31, 32) is in the left-right direction. And a rear boom (11d) having substantially the same width as that of the rear work machine (27) .

Images