JP3450532B2 - Airframe balance maintenance structure of hydraulic traveling agricultural work machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for maintaining a machine body balance of a hydraulic traveling agricultural working machine. 2. Description of the Related Art Conventionally, as a hydraulic traveling agricultural working machine having a crawler-type traveling unit independent of left and right, for example, there is a combine. In this combine, a grain stalk is scraped into a front portion of the machine to cut and cut. In addition, a mowing work section for transporting to the threshing section built in the machine is attached. [0003] However, when a working machine is connected to the rear of the machine equipped with a crawler type traveling section, the position of the center of gravity is shifted to the rear side of the machine, and The so-called head-up state in which the front side of the aircraft rises, and the steering operability deteriorates. For this purpose, it is necessary to attach a front weight to the front end of the machine to maintain good balance of the aircraft.However, if such a front weight is attached, the weight of the entire aircraft increases, and the steering operability is improved. There is a problem that can not be secured. Therefore, according to the present invention, there is provided, behind a machine equipped with a pair of right and left crawler-type traveling units,
A hydraulic traveling agricultural work machine in which a work machine is vertically connected via a lifting mechanism, wherein a tail wheel operated by a tail wheel lifting hydraulic cylinder is provided on the work machine, and the work machine lifting hydraulic cylinder is provided on the lifting mechanism. A hydraulic circuit is interposed between the hydraulic cylinder for lifting and lowering the work machine and the hydraulic cylinder for raising and lowering the tail wheel. The tail wheel lowering operation of the tail hydraulic wheel cylinder is interlocked, and in the same hydraulic circuit part, the tail wheel ground detecting unit that detects the tail wheel grounding by the pressure change of the hydraulic oil that lowers the tail wheel, and the tail wheel ground detecting unit And a control unit for stopping the lifting operation of the working machine and the lowering operation of the tail wheel based on the detection result of the tail wheel grounding detection by means of a hydraulic traveling agricultural working machine is provided. is there. When the hydraulically traveling agricultural working machine is to be operated in a non-working operation, for example, on a road, the working machine connected to the rear of the machine via a lifting mechanism is raised to a non-ground state. At this time, when the hydraulic circuit unit operates the hydraulic cylinder for lifting and lowering the working machine to raise the working machine,
In conjunction with this, the tail wheel lifting hydraulic cylinder operates, the tail wheel descends, and when the tail wheel touches down, the tail wheel contact detection unit detects it from the pressure change of the pressure oil that moves the tail wheel down. Then, the detection result is input to the control unit, and the control unit stops the ascent operation of the work machine and the descending operation of the tail wheel via the hydraulic circuit unit. In the state,
The vehicle will travel on the road. Therefore, the work machine connected to the rear of the machine can be supported by the tail wheel, and the front-rear weight balance of the machine can be ensured without head-up of the machine. Direction operability can be improved. In addition, when the farming work is performed by lowering the working machine and touching the ground, the tail wheel rises to be in a non-ground state, so that the tail wheel does not hinder the farming work, and the farm work is reliably performed. It can be carried out. Embodiments of the present invention will be described below with reference to the drawings. A shown in FIG. 1 is a hydraulic traveling agricultural working machine equipped with a machine body balance maintaining structure according to the present invention. The working machines are connected by a three-point link type lifting mechanism D so as to be able to move up and down freely so that work can be performed by various working machines. As shown in FIG. 1, the machine B has a body frame 2 laid between the traveling frames 1a, 1a of a pair of left and right crawler traveling parts 1, 1 and is provided at a front portion of the body frame 2. A prime mover unit 3 is provided, and an operating unit 4 is provided at a rear portion. The prime mover unit 3 is casing by a bonnet 5 and a front grill 6, while the driving unit 4 is covered by a cabin 7. As shown in FIG. 1, the operating section 4 has a handle column 9 erected at a front portion on a floor 8 formed in a cabin 7 and a handle 10 is attached to an upper end portion of the handle column 9. The seat 11 is placed on the floor 8 located behind the handle 10.
Is placed via the seat support 12. 13 is a forward / backward speed adjusting lever. As shown in FIGS. 1 and 2, a rotary tilling work machine C has a tilling transmission case 21 mounted on a working machine frame 20 and a tilling claw 25 interlocked and connected to a lower portion of the tilling transmission case 21. A rear cover 22 is attached to the rear end of the work machine frame 20. 23 is a connection frame, and 24 is a hanger rod. As shown in FIGS. 1 and 2, a pair of right and left tail wheel lifting hydraulic cylinders 25, 25 extending vertically are attached to the left and right sides of the work machine frame 20, respectively. 25, make the respective piston rods 26, 26 extend and contract downward, and attach the tail wheel 2 to the lower end of each piston rod 26, 26.
7,27 are installed. As shown in FIGS. 1 and 2, the lifting mechanism D includes a pair of left and right lift arms 31, 31 at the upper end of a stay 30 attached to the rear end of the body frame 2, and pivoting pins 32, 31. Three
2 and a pair of left and right lower links 33, 33 are pivotally supported at the lower end of the stay 30 by pivoting pins 34, 34 at the lower end of the stay 30. The base end of the top link 36 is pivotally supported by a pivot pin 37 so as to be vertically rotatable on a top link stay 35 provided on the top link stay 35, and a portal frame 38 is straddled between the distal ends of the pair of left and right lower links 33, 33, Hitch 39 attached to the upper central part of the same frame 38
The upper end of the top link 36 is pivotally supported by a pivot pin 40 so as to be vertically rotatable, and a lift link 41 is provided between each end of the pair of left and right lift arms 31, 31 and the middle of the pair of left and right lower links 33, 33. 41 are interposed. 42, 43, and 44 are pivot pins. As shown in FIGS. 1 and 2, working machine lifting hydraulic cylinders 45, 45 are interposed between the lower left and right sides of the stay 30 and the respective intermediate portions of the pair of left and right lift arms 31, 31. The piston rods 46, 46 of the hydraulic cylinders 45, 45
The lift arms 31, 31 are vertically rotated in conjunction with the expansion and contraction of the upper link 36, and the top link 36 and the pair of lower links 33, 33 are vertically rotated in conjunction with the lift arms 31, 31 to move the upper frame 36 and the hitch 39 to the gate frame 38 and the hitch 39. The connected working machine C can be raised and lowered. 47 and 48 are connecting pins. In the above-described configuration, the gist of the present invention is, as shown in FIG.
5 and the tail wheel lifting hydraulic cylinders 25, 25
With the hydraulic circuit unit 50 interposed, the work machine lifting operation by the work machine elevating hydraulic cylinders 45, 45 and the tail wheel lowering operation by the tail wheel elevating hydraulic cylinders 25, 25 are linked by the hydraulic circuit unit 50, and the hydraulic circuit A tail wheel contact detection unit 51 for detecting the ground contact of the tail wheels 27, 27 based on a pressure change of the pressure oil for lowering the tail wheels 27, 27, and a tail wheel contact detection result by the tail wheel contact detection unit 51 Thus, a control unit 52 for stopping the ascent operation of the work implement C and the descending operation of the tail wheels 27, 27 is provided. As shown in FIG. 2, the hydraulic circuit section 50 includes a middle part of a working machine lifting oil passage 53 connecting the working machine lifting hydraulic cylinder 45 and the hydraulic pump P, A switching valve 55 is interposed between the hydraulic cylinder 45 and the hydraulic tank 54 for connecting the hydraulic tank T to a middle portion of the hydraulic passage 54 for lifting and lowering the work implement, and the switching valve 55 and the hydraulic cylinder 25 for raising and lowering the tail wheel are moved up and down by the tail wheel. Oil passages 56 and 57. In this manner, the hydraulic oil is supplied from the hydraulic pump P to the working machine elevating oil passage 53 → the switching valve 55 → the working machine elevating oil passage.
When supplied into the work cylinder lifting pressure cylinder 45, the piston rod 46 extends and the rotary tilling work machine C rises, and the hydraulic cylinder 45 → work machine lift oil passage.
54 → switching valve 55 → tail wheel elevating oil passage 56 → pressure oil is supplied into the tail wheel elevating hydraulic cylinder 25, so that the piston rod 26 extends and the tail wheel 27 moves downward. When the tail wheel 27 comes into contact with the ground, the pressure of the pressure oil in the tail wheel lifting / lowering oil passage 56 increases and changes, and the tail wheel touch detection unit 51 detects the pressure change, and controls the detection result. When input to the unit 52, the control unit 52 outputs a signal to the switching valve 55,
Activate the switching valve 55 to switch each hydraulic cylinder 45, 2
The supply of pressurized oil to 5 is stopped. Accordingly, the raising operation of the rotary tilling work machine C is stopped, and the work cultivator C is supported by the tail wheel 27. Further, the switching valve 55 is switched to the opposite side, and the hydraulic oil is supplied from the hydraulic pump P to the working machine lifting / lowering oil passage 53 → the switching valve 55 → working machine lifting / lowering oil passage 54 → working machine lifting / lowering cylinder.
When supplied inside 45, the piston rod 46 shortens,
The rotary tilling work machine C descends, and at the same time, hydraulic oil is supplied into the hydraulic cylinder 45 → working machine elevating oil passage 53 → switching valve 55 → tail wheel elevating oil passage 57 → tail wheel elevating hydraulic cylinder 25. Thus, the piston rod 26 is shortened and the tail wheel 27 is raised. When the tail wheel 27 rises to the set height above the ground, the pressure of the pressure oil in the tail wheel elevating oil passage 56 changes downward, and the tail wheel contact detection unit 51 detects the pressure change. When the detection result is input to the control unit 52, the control unit 52 outputs a signal to the switching valve 55 to switch the switching valve 55 to stop supplying the hydraulic oil to each of the hydraulic cylinders 45 and 25. I have to. Therefore, the lowering operation of the rotary tilling work machine C is stopped, and the work cultivator C is brought into contact with the ground so that it can be tilled. As described above, in this embodiment, when the rotary tilling work machine C is raised to the non-working posture, the work cultivator C can be supported by the tail wheels 27, 27. The front-rear weight balance can be kept good, similarly to the case where the work machine C is grounded and the work posture is set, and the steering operability of the machine body can be secured well. FIG. 3 shows a mounting structure of the forward / reverse speed adjusting lever 13, in which a shaft support pipe 61 extending in the left-right width direction is laid horizontally on a supporting machine frame 60, and is inserted into the coaxial support pipe 61 in the left-right width direction. Through the lever support shaft 62 that extends
A mounting boss 13a attached to the base end of the forward / reverse speed adjusting lever 13 is attached to the left and right side ends of the left and right sides so as to be freely replaceable. 63
Is a mounting pin, and 64 is lever operating position holding means. Therefore, the operability of the forward / reverse speed adjusting lever 13 can be improved because the lever 13 can be selectively attached to one of the left and right ends of the lever support shaft 62 according to the operator's preference. Can be done. FIGS. 4 and 5 show the front weight mounting structure.
a, 2a, a pair of front and rear elevating guide grooves 6
5, 65, 66, 66, while a pair of left and right weight support arms 67, 67 arranged on the left and right side wall forming portions 2a, 2a on the outside.
Are connected to the connecting pins 68, 68, via the lifting guide grooves 65, 65, 66, 66.
Up and down slides are connected by 69,69 so that they can be moved up and down freely.
And a plurality of front weights 71, 71, 71 are detachably locked and mounted on the weight mounting frame 70. Further, a pair of left and right connecting pins 69, 69 on the rear side are provided.
Between the inner ends of the cylinder connecting frame 72, the central portion of the connecting frame 72 and the front wall forming portion 2b of the body frame 2
Bracket 7 with the lifting hydraulic cylinder 73 between the center of
It is interposed via 4,75. In this manner, the piston rod 76 of the lifting hydraulic cylinder 73 is shortened, and the weight support arms 67, 67 are slid up along the lifting guide grooves 65, 65, 66, 66, whereby Both weight support arms 67,67
The height of the front weights 71, 71, 71, 71 attached to the distal ends of the front weights via the weight mounting frame 70 can be increased, while the front weights 71, 71, 71 are extended by operating the piston rod 76 to extend. , 71 at normal ground level. Therefore, when traveling on the road, the front weights 71, 71, 71 are set at a normal height above the ground. For example, when turning the aircraft near a ridge or loading the aircraft on a truck or the like, the front weights 71, 71, 71 are used. , 71, 71, the front weights 71, 71, 71 can be moved without colliding with ridges and other obstacles. Reference numeral 80 shown in FIGS. 6 and 7 denotes a side marker, which is a turning part for changing direction at the center of the ceiling wall of the cabin 7.
Attach the side marker 80 to the rotating part 81 for the same direction conversion.
The first and second intermediate portions 80b and 80c are attached to the base end portion 80a so as to be freely expandable and contractable, and the distal end portion 80d is attached to the second intermediate portion 80c. It is telescopically mounted. 80e is a side pendulum for visual recognition. In addition, a 180-degree forward / reverse rotation motor 83 is provided in the direction changing / rotating section 81, and the side marker 80 is horizontally lowered to the left side and horizontally to the right side by the motor 83. The direction can be freely changed between the use position. The operation of the 180-degree forward / reverse rotation motor 83 can be performed by a side marker direction changing knob (not shown) provided in the operation unit 4. A motor 82 for expansion and contraction is attached to the base 80a of the side marker 80, and the first and second intermediate portions 80b and 80c and the distal end 80d can be extended and contracted by the motor 82, respectively. The expansion / contraction motor 82 is operated by a dial type in which the length of the side marker 80 is set to a length corresponding to the width of the working machine C on the left and right sides, for example, 2 m, 4 m, 6 m, and 8 m. A knob (not shown) is provided on the driving unit 4 so that the length of the side marker 80 can be adjusted by the knob. In this way, the side marker 80 is set to the use position on either the left or right side, and the side marker 80 is set to have substantially the same length as the left and right overhang width of the working machine C connected behind the machine 1. By extending the operator, the operator can grasp the laterally extending width of the working machine C by visually recognizing the side recognizing pendulum 80e for side recognition while sitting on the seat 11 of the driving unit 4. This makes it possible to safely and efficiently perform the turning work of the aircraft and the like. According to the present invention, the following effects can be obtained. That is, when the work machine is lifted and not moving, the tail wheel contacts the ground and the weight of the work machine is shared by the tail wheel. It can be held in the same manner as during work, and the front and rear weight balance of the machine can be maintained well regardless of work and non-work, and steering operability of the machine can be secured well.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a hydraulic traveling agricultural working machine including a machine body balance holding structure according to the present invention. FIG. 2 is an explanatory side view of the main part. FIG. 3 is an explanatory front sectional view showing a mounting structure of a forward / backward speed adjusting lever. FIG. 4 is an explanatory side sectional view showing a front weight mounting structure. FIG. 5 is an explanatory plan view of the same. FIG. 6 is an explanatory front view of the machine showing a mounting structure of a side marker. FIG. 7 is an explanatory plan view of the machine. [Description of Signs] A Hydraulic traveling agricultural work machine B This machine C Tilling work machine D Elevating mechanism 25 Tail wheel elevating hydraulic cylinder 45 Work implement elevating hydraulic cylinder 50 Hydraulic circuit section

Claims (1)

(57) [Claim 1] A hydraulic traveling agricultural working machine in which a working machine is vertically connected via a lifting mechanism behind a machine having a pair of right and left crawler traveling parts. The work machine is provided with a tail wheel that is operated by a tail wheel elevating hydraulic cylinder, while the lifting mechanism is provided with a work machine elevating hydraulic cylinder, and the work machine elevating hydraulic cylinder and the tail wheel elevating hydraulic cylinder are disposed between the work machine elevating hydraulic cylinder and the tail wheel elevating hydraulic cylinder. A hydraulic circuit section is interposed in the hydraulic circuit section, and the hydraulic circuit section interlocks the work machine lifting operation by the hydraulic cylinder for lifting and lowering the work machine and the tail wheel lowering operation by the hydraulic cylinder for raising and lowering the tail wheel. A tail wheel contact detection unit that detects the tail wheel contact by the pressure change of the hydraulic oil that causes the wheel to move down, and the work implement lifting operation and tail wheel descent based on the tail wheel contact detection result by the tail wheel contact detection unit A control unit for stopping the operation is provided. Airframe balance holding structure of the hydraulic traveling farm machine according to claim and.