JP2012000019A - Mowing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mowing apparatus capable of lifting and adjusting the position of a mowing mechanism in the vertical and horizontal directions by a simple-structured link mechanism, and capable of reducing the weight.SOLUTION: The mowing apparatus has a mowing mechanism 25 attached to the rear of a working vehicle via a link mechanism. The mowing apparatus includes: a lifting link mechanism 5 to be driven to be lifted by a hydraulic cylinder 54 mounted in the working vehicle; a connection bracket 55 attached to the rear of the lifting link mechanism 5; a longitudinal rotating parallel link mechanism 60 composed of a front lateral link 61 and a rear lateral link 62 which are disposed parallel in the longitudinal direction to the connection bracket 55 and whose one ends are pivotally supported by a vertical shaft member; a mower attached bracket 63 for hanging the mowing mechanism 25 by pivotally supporting the other ends of the front lateral link 61 and rear lateral link 62; and a rotating position fixing means 59 for fixing the rotating position of the front lateral link 61 or rear lateral link 62 relative to the connection bracket 55.

Description

  The present invention relates to a technique of a mowing apparatus that is attached to a traveling part of a work vehicle via a link mechanism.

2. Description of the Related Art Conventionally, a mowing apparatus is known in which a mowing apparatus is attached to a rear portion of a traveling portion of a work vehicle via an elevating link mechanism, and mowing grass that grows on a fence or a slope while riding on the work vehicle (patent) Reference 1).
The mowing apparatus in Patent Document 1 has a work machine mounting base attached to the rear part of the riding management machine, and mounting brackets attached to the left and right sides of the main pipe provided in the left and right direction of the work machine mounting base. The lifting / lowering arm of the lifting / lowering link mechanism is attached, and the cutting mechanism is attached to the tip of the lifting / lowering arm via the upper link. A vertical hydraulic cylinder is interposed between the lifting arm and the mounting bracket, and the mowing mechanism is configured to be movable up and down by extending and contracting the vertical hydraulic cylinder. Further, a perspective hydraulic cylinder is interposed between the lifting arm and the upper link, and the distance between the cutting mechanism and the traveling unit can be adjusted by expansion and contraction of the perspective hydraulic cylinder.

JP-A-11-9008

The above-described mowing apparatus is provided with a vertical hydraulic cylinder for raising and lowering the mowing mechanism and a perspective hydraulic cylinder for adjusting the distance between the traveling unit and the mowing mechanism in the elevating link mechanism. The weight on the mechanism side became heavy, and the weight balance on the left and right sides was poor. In addition to the hydraulic pump for driving the cutting blade of the cutting mechanism, a hydraulic pump for operating the upper and lower hydraulic cylinders and the perspective hydraulic cylinder is required, and separate switching valves and piping are also required, which increases costs. It was.
Further, in order to be able to adjust the front and rear position of the cutting mechanism, the lifting arm is configured to be able to turn back and forth around the vertical axis with respect to the mounting bracket, but when the front and rear position of the cutting mechanism is changed, Since the direction of the mowing mechanism is also changed, it is necessary to provide a left-right rotation adjustment mechanism between the upper link and the mowing mechanism, and adjustment of the front-rear position of the mowing mechanism has been a troublesome task.

  The present invention has been made in view of the situation as described above, and provides a mowing apparatus that realizes the lifting and lowering of the mowing mechanism and the adjustment of the front, rear, left, and right positions by a link mechanism with a simple configuration, and which can also be reduced in weight.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in claim 1, a mowing device for attaching a mowing mechanism to a rear portion of a work vehicle via a link mechanism, and an elevating link mechanism that is driven up and down by an actuator provided in the work vehicle;
A connecting bracket attached to the rear of the elevating link mechanism;
A front-rear rotating parallel link mechanism comprising a front lateral link and a rear lateral link, one end of which is arranged in parallel with the connecting bracket and pivotally supported by a vertical shaft member;
A cutting attachment bracket that pivotally supports the other end of the front lateral link and the rear lateral link and suspends a cutting mechanism;
Rotation position fixing means for fixing the rotation position of the front lateral link or the rear lateral link with respect to the connection bracket.

  According to a second aspect of the present invention, the elevating link mechanism is constituted by a parallel link mechanism including an upper link and a lower link.

  According to a third aspect of the present invention, the cutting attachment bracket suspends the cutting mechanism via a vertical swing link mechanism, and the pivot support portion at the other end of the front / rear rotation parallel link mechanism is provided on one side of the cutting attachment bracket. The upper and lower pivot link mechanisms of the vertical swing link mechanism are formed on the left and right other sides of the cutting attachment bracket.

  As effects of the present invention, the following effects can be obtained.

In claim 1, since the cutting mechanism can also be raised and lowered by moving the lifting link mechanism up and down by a hydraulic cylinder provided in the work vehicle, a hydraulic cylinder, a hydraulic pump, piping, a switching valve, etc. for raising and lowering the cutting mechanism are provided separately. It becomes unnecessary and can be reduced in weight and cost. Therefore, even a small work vehicle can be mounted and operated.
Further, the left and right positions of the mowing mechanism can be changed by rotating the front / rear rotating parallel link mechanism. At this time, since it is constituted by parallel links, the front-rear direction of the cutting mechanism does not change, so there is no need to provide a member for adjusting the horizontal direction of the cutting mechanism on the cutting attachment bracket, and the structure is inexpensive. Easy to do.

  In claim 2, since the elevating link mechanism is constituted by a parallel link mechanism, a member for adjusting the vertical direction of the mowing mechanism when the mowing mechanism is raised or lowered, that is, for adjusting the mowing mechanism horizontally. There is no need to provide a member, and the structure can be simplified at low cost.

  According to the third aspect of the present invention, since the pivot support portion of the front / rear rotation parallel link mechanism and the up / down swing link mechanism is formed integrally with the cutting attachment bracket, the weight can be reduced with a simple configuration.

The side view which showed the whole structure of the mowing apparatus which concerns on embodiment of this invention. The top view which showed the whole structure of the mowing apparatus which concerns on embodiment of this invention. The perspective view of a connection bracket part. The perspective view of a cutting attachment bracket part. The side view which attached the cutting mechanism to the riding management machine. The side view of embodiment which drives the pump which drives a mowing mechanism from a driving | running | working part. The top view of embodiment which drives a mowing mechanism with a transmission motor. The perspective view comprised so that attachment bracket could be attached to a simple detachable hitch.

An embodiment of the present invention will be described from the overall configuration with reference to FIGS. In the following, the vertical direction is defined with the arrow U direction in FIG. 1 as the upward direction, and the front-rear direction is defined with the arrow F direction as the forward direction.
The mowing apparatus 20 includes a machine base 21 attached to the rear part of the traveling unit 1 of the work vehicle, a working engine 22 mounted on the machine base 21, and driven by the engine 22 on the machine base 21. A hydraulic pump 23 to be mounted, a hydraulic oil tank 24 that supplies hydraulic oil to the hydraulic pump 23 and is mounted on the machine base 21, and a lift link mechanism 5 and a back-and-forth rotation parallel link at the rear of the traveling unit 1. A cutting mechanism 25 and the like that are connected via a mechanism 60 and are driven by pressure oil from the hydraulic pump 23 are provided. Although the work vehicle is described as a rice transplanter in the present embodiment, it can also be applied to a three-wheel or four-wheel riding management machine, a tractor, or the like that includes a lifting link mechanism.

  The traveling unit 1 is obtained by removing the planting device of the rice transplanter. The traveling unit 1 includes a body frame 2, a traveling engine 3 mounted on the front of the body frame 2, and the engine 3. A transmission case 4 for shifting power to transmit power to front wheels 6 and rear wheels 7 to be described later, an elevating link mechanism 5 connected to a rear portion of the body frame 2, and a front axle case 12 from the body frame 2. Front wheels 6 and 6, rear wheels 7 and 7 supported from the rear of the transmission case 4 via a rear axle case 8, and a control unit 9 and the like disposed on the front and rear halfway of the body frame 2. Prepare.

The fuselage frame 2 is arranged in a pair of left and right front and rear frames extending in a substantially horizontal direction in the front and rear direction and in a direction orthogonal to the left and right front and rear frames (left and right direction). It is composed of a plurality of connecting frames that are connected at intervals, and a rear frame 2a that extends rearward and upward from the rear end of the front and rear frames. The rear frame portion 2a supports the front portion of the elevating link mechanism 5, and the upper portion is configured to support a seat 10 and a machine base 21, which will be described later.
The engine 3 is mounted on the front portion of the machine body frame 2 and transmits to the front wheels 6 and the rear wheels 7 after shifting. However, the configuration may be such that the traveling engine 3 is disposed in the middle of the airframe before and after.
The transmission case 4 houses the transmission, shifts the power from the engine 3, and transmits the shifted power from the front part of the transmission case 4 to the front axle case 12 via the transmission mechanism to drive the front wheels 6 and 6. Then, the rear wheels 7 and 7 are driven by transmitting the power after shifting from the rear part of the transmission case 4 to the left and right rear axle cases 8 and 8.

The elevating link mechanism 5 includes left and right upper links 51 and 51, left and right lower links 52 and 52, a rotating arm 53, a hydraulic cylinder 54 as an actuator for driving up and down. The front ends of the upper links 51 and 51 and the front ends of the lower links 52 and 52 are supported by the rear frame portion 2a of the body frame 2 so as to be vertically rotatable, and the rear ends of the upper links 51 and 51 and the lower links 52 and 52 are supported. The rear end is supported by the connection bracket 55 by an upper connection pin 56 and a lower connection pin 57 so as to be rotatable up and down, and constitutes a parallel link mechanism.
The lower part of the rotating arm 53 is fixed to the lower link 52, and the upper part of the rotating arm 53 is connected to one end of the hydraulic cylinder 54. The other end of the hydraulic cylinder 54 is connected to the body frame 2. A reinforcing frame 58 is interposed between the upper portion of the rotating arm 53 and the lower connecting pin 57 to be reinforced.

  With this configuration, when the hydraulic cylinder 54 is contracted by operating the work lever 13 that is provided in the control unit 9 and can be moved up and down, the rear portions of the upper links 51 and 51 and the lower links 52 and 52 are raised. When the hydraulic cylinder 54 is rotated and extended, the rear portions of the upper links 51 and 51 and the lower links 52 and 52 are lowered and rotated, and the connecting bracket 55 can be moved up and down substantially in parallel. However, the elevating link mechanism 5 is not limited to the above-described configuration, and the upper link 51 may be constituted by a single piece, or the front portion of the upper link 51 may be connected to one end of the hydraulic cylinder 54 in two points. It is also possible to configure a link type or a three-point link type. Further, the connecting structure of the rear portions of the upper links 51 and 51 and the lower links 52 and 52 is not limited. As shown in FIG. 8, a connecting bracket is provided by a simple detachable hitch 97 (so-called quick hitch or auto hitch). 55 can also be configured to be detachable. That is, a simple detachable hitch 97 is attached to the rear portions of the upper links 51 and 51 and the lower links 52 and 52, and the upper connecting pin 56 is engaged with the upper engaging portion 97a of the simple detachable hitch 97, so that The lower connecting pin 57 is engaged with the lower engaging portion 97b of the detachable hitch 97, and the lower connecting pin 57 is fixed by the lock member 97c. FIG. 8 shows a three-point link type hitch that is mounted on a large rice transplanter.

  The control unit 9 is arranged on the front and rear halfway of the body frame 2, a seat 10 on which an operator is seated, a steering handle 11 that is disposed in front of the seat 10 and steered, and a gear that changes a traveling speed. It consists of a lever, a working lever (moving mechanism 25 in the present embodiment), and a working lever for turning on and off the PTO.

  The machine base 21 attached to the rear part of the traveling unit 1 is for mounting the engine 22, the hydraulic pump 23, and the hydraulic oil tank 24. The machine base 21 is formed in a rectangular shape in plan view, and has a longitudinal direction arranged in the left-right direction. Mounting stays 21a and 21a extend forward from the front portions on both sides of the machine base 21, and the front ends of the mounting stays 21a and 21a. Is detachably fixed to the upper part of the rear frame 2a of the machine body frame 2 with bolts or the like. Further, an operation tool mounting bracket 26 is fixed to the front left and right side front portions of the machine base 2, that is, the front portion of the mounting stay 21a on the right side in the traveling direction by bolts or the like, and is pumped from the hydraulic pump 23 to the operation tool mounting bracket 26. A cutting lever 27 serving as an operation tool for switching the oil supply direction of the pressure oil is attached.

  Support frames 29 and 29 are interposed between the left and right rear portions of the machine base 21 and the rear axle cases 8 and 8. That is, the upper portions of the support frames 29 and 29 are detachably fixed to the rear left and right sides of the machine base 21 with bolts, and the lower portions of the support frames 29 and 29 are detachably fixed to the rear axle cases 8 and 8 with bolts and the like. The

  Accordingly, by removing the bolts that fix the mounting stays 21a and 21a with respect to the rear frame 2a and the bolts that fix the support frames 29 and 29 with respect to the rear axle cases 8 and 8, the machine base 21 can be easily moved to the traveling portion. 1 can be removed. Conversely, the machine base 21 can be easily fixed to the machine body frame 2 and the rear axle cases 8 and 8 with bolts. Thus, the machine base 21 can be easily attached to and detached from the traveling unit 1 and can be supported at four points. In addition, by changing the length and bending of the attachment stays 21a and 21a and the support frames 29 and 29, the machine base 21 can be attached from the small rice transplanter to the traveling portion 1 of the large rice transplanter.

  An engine 22, a hydraulic pump 23, a hydraulic oil tank 24, a switching valve 31, and a cutting lever 27 are attached to the machine base 21 and are detachable as one unit. Specifically, the engine 22 is placed on the right side of the machine base 21, the hydraulic pump 23 is placed on the left side of the machine base 21, and the hydraulic oil tank 24 is placed above the hydraulic pump 23 via the mounting frame 30. Placed.

  The engine 22 is arranged so that the crankshaft is in the left-right direction, the output shaft projects leftward, and the output shaft is connected to the drive shaft of the hydraulic pump 23. An engine stop switch, a fuel cock, an accelerator lever, a recoil starter, and the like that serve as an operation unit of the engine 22 are arranged on the right side, and are in the same direction as the arrangement direction of the cutting lever 27 and the working side of the cutting mechanism 25. Thus, it is set as the structure which is easy to operate.

The hydraulic pump 23 is driven by the engine 22. The suction port of the hydraulic pump 23 communicates with the hydraulic oil tank 24 via a pipe (the pipe is not shown below), and the discharge port communicates with the switching valve 31 via the pipe. The switching valve 31 has a cutting lever 27 serving as an operating tool, and by operating the cutting lever 27, the oil supply direction of the hydraulic oil from the hydraulic pump 23 is switched. That is, the switching valve 31 has a pump port connected to the hydraulic pump 23, a tank port that returns to the hydraulic oil tank 24, and a discharge port that discharges to the hydraulic motor 32 of the cutting mechanism 25, and each port has a cutting lever 27. The discharge direction is switched by sliding the spool of the switching valve 31 connected to the. When the cutting lever 27 is turned to the cutting “on” side, the pressure oil from the hydraulic pump 23 is sent to the hydraulic motor 32, and when the cutting lever 27 is turned to the “cut” side, the pressure oil from the hydraulic pump 23 is sent. Is fed to the hydraulic oil tank 24.
However, as shown in FIG. 6, the hydraulic pump 23 is a hydraulic pump 23 a that is attached so as to be directly driven from the output shaft of the engine 3 of the traveling unit 1, or the hydraulic pump 23 b is attached to the transmission case 4, It can also be set as the structure driven from the input shaft to. In this case, the hydraulic pumps 23a and 23b can be shared with a hydraulic pump (charge pump) that drives the hydraulic cylinder 54 and the like of the traveling unit 1, or a dual hydraulic pump separate from the charge pump. You can also. With this configuration, it is only necessary to attach the hydraulic oil tank 24 on the machine base 21, and the configuration can be further simplified and the cost can be reduced.
Further, as shown in FIG. 7, the hydraulic pump 23 can be configured to be driven by an electric motor 95 instead of the engine 22. In this case, power may be obtained from a battery attached to the traveling unit 1, but when power is insufficient, a motor 95 and a battery 96 that supplies power to the motor 95 are mounted on the machine base 21. You can also. In this case, handling is easier than mounting the engine 22, and noise, vibration, and the like can be reduced.

  The hydraulic oil tank 24 is placed and fixed on the mounting frame 30. The mounting frame 30 is formed by bending a plate body in a reverse U shape in a rear view, and is fixed to the machine base 21 with bolts or the like, and the hydraulic oil tank 24 on the upper surface. The hydraulic pump 23 is housed inside the mounting frame 30.

  The mowing mechanism 25 is connected via a front / rear rotation parallel link mechanism 60 connected to the rear portion of the elevating link mechanism 5 and a vertical swing link mechanism 40 connected to the tip of the front / rear rotation parallel link mechanism 60. .

  The front / rear rotation parallel link mechanism 60 is composed of a parallel link, and connects the cutting mechanism 25 so as to be able to rotate back and forth while facing forward. That is, the connecting bracket 55 is connected to the rear end of the lift link mechanism 5, and one end of the front lateral link 61 and the rear lateral link 62 is pivoted to the connection bracket 55, and the front lateral link 61 and the rear lateral direction are connected. A cutting attachment bracket 63 is connected to the other end of the link 62.

  As shown in FIG. 3, the connecting bracket 55 is formed in a reverse F shape in a side view by a front vertical frame 55a, an upper plate 55b, and an intermediate plate 55c. The front vertical frame 55a is formed in a substantially square frame shape, and the rear portions of the upper link 51 and the lower link 52 are pivotally supported by the upper connecting pin 56 and the lower connecting pin 57 at the lower left and right column supports, respectively. . From the upper rear surface of the front vertical frame 55a, the upper plate 55b and the intermediate plate 55c are substantially horizontal and extend in parallel rearward.

  The upper plate 55b and the intermediate plate 55c are formed in a substantially trapezoidal shape with a short upper side on the rear side and a lower lower side on the front side in plan view. A shaft hole is opened at the top on the right side of the lower side of the upper plate 55b and the intermediate plate 55c, and one end of the front lateral link 61 is inserted between the upper plate 55b and the intermediate plate 55c. The pivot shaft 64 is passed through the opened shaft hole and the shaft holes of the upper plate 55b and the intermediate plate 55c, and the front lateral link 61 is pivotally supported so as to be rotatable forward and backward. In addition, a shaft hole is opened at the top on the right side of the upper side of the upper plate 55b and the intermediate plate 55c, and one end of the rear lateral link 62 is inserted between the upper plate 55b and the intermediate plate 55c. The pivot shaft 65 is passed through the shaft hole opened at one end and the shaft holes of the upper plate 55b and the intermediate plate 55c, and the rear lateral link 62 is pivotally supported so as to be able to rotate forward and backward. The left side of the upper plate 55b and the intermediate plate 55c and between the intermediate plate 55c and the front vertical frame 55a are appropriately connected and fixed by a reinforcing plate to be reinforced.

A rotation position fixing means 59 is provided between the connecting bracket 55 and the front lateral link 61 or the rear lateral link 62. Specifically, the rotation position fixing means 59 is a rotation fixing plate 66 fixed to one side of the front lateral link 61 or the rear lateral link 62, and the rotation fixing plate 66 is fixed to the connection bracket 55. In this embodiment, the rotation fixing plate 66 is fixed to one side of the rear lateral link 62.
Then, a fixing hole is opened in a substantially middle portion between the upper sides of the upper plate 55b and the intermediate plate 55c, and a rotation fixing plate 66 fixed on the upper surface of one end of the rear lateral link 62 between the upper plate 55b and the intermediate plate 55c. Is inserted and the fixing pin 67 is inserted into the adjustment hole 66a of the rotation fixing plate 66 fixed to the upper surface of one end of the rear lateral link 62, and the front lateral link 61 and the rear lateral link 62. The angle can be fixed. The rotation fixing plate 66 is formed in a semicircular shape in plan view, and an axial hole is opened at the center of the circle, and adjustment holes 66a, 66a,... Are formed at regular intervals along an arc around the axial hole. There are multiple openings. The shaft hole at the center of the circle is aligned with the shaft hole of the pivot shaft 65.

  In this way, the fixing pin 67 is removed, and the front lateral link 61 and the rear lateral link 62 are rotated back and forth at a desired angle, that is, the distance in the left-right direction from the traveling unit 1 to the cutting mechanism 25 is the desired distance. The front lateral link 61 and the rear lateral link 62 can be fixed by inserting the fixing pin 67 with the fixing holes of the upper plate 55b and the intermediate plate 55c aligned with the adjusting hole 66a. Become. However, the rotation fixing plate 66 of the rotation position fixing means 59 may be provided on one side of the front lateral link 61. Further, the rotation fixing plate 66 is integrally formed with the connection bracket 55, and It is also possible to adopt a configuration in which the fixing pin 67 is inserted and fixed in one fixing hole provided in the adjustment hole 66a of the rotation fixing plate 66 and the front lateral link 61 or the rear lateral link 62.

A cutting attachment bracket 63 is connected to the other ends of the front lateral link 61 and the rear lateral link 62. As shown in FIG. 4, the cutting attachment bracket 63 is provided with a pivot portion at the other end of the front / rear rotation parallel link mechanism 60 on the left and right sides (left side), and on the left and right other side (right side) of the cutting attachment bracket 63. An upper pivot portion of the vertical swing link mechanism 40 is formed. Specifically, the cutting attachment bracket 63 includes an upper plate portion 63a, a lower plate portion 63b, a vertical plate portion 63c, and a side plate portion 63d.
The upper plate portion 63a is formed in a substantially trapezoidal shape having a short upper side on the front side and a lower lower side on the rear side in plan view. The lower plate portion 63b is configured in a substantially triangular shape in plan view, is configured in substantially the same shape as the left side of the upper plate portion 63a, and is disposed in parallel with the upper plate portion 63a. The vertical plate portion 63c is a rectangular plate and is fixed in the front-rear vertical direction on the lower surface of the middle portion of the upper plate portion 63a and the right side of the lower plate portion 63b. The side plate portion 63d is bent downward from the right side of the upper plate portion 63a and is disposed in parallel with the vertical plate portion 63c.

  A shaft hole is opened in alignment with the top of the upper plate portion 63a on the left side of the upper side and the front top portion of the lower plate portion 63b in plan view, and the front lateral link 61 is formed between the shaft holes of the upper plate portion 63a and the lower plate portion 63b. The pivot shaft 68 is vertically penetrated in a state where the shaft hole opened at the other end of the shaft is aligned, and the other end of the front lateral link 61 is pivotally supported by the cutting attachment bracket 63 so as to be pivotable forward and backward.

A shaft hole is opened in alignment with the top of the left side of the lower side of the upper plate portion 63a and the left top of the lower plate portion 63b in plan view, and a rear lateral link is formed between the shaft holes of the upper plate portion 63a and the lower plate portion 63b. With the shaft hole opened at the other end of 62 being aligned, the pivot shaft 69 is vertically penetrated, and the other end of the rear lateral link 62 is pivotally supported by the cutting attachment bracket 63 so as to be pivotable forward and backward.
Thus, even if the connecting bracket 55, the front lateral link 61, the rear lateral link 62, and the cutting attachment bracket 63 constitute a parallel link, and the rotation angle of the front lateral link 61 and the rear lateral link 62 is changed, The mowing mechanism 25 is configured to always face forward.

The vertical swing link mechanism 40 includes a cutting attachment bracket 63, a front vertical link 41, a rear vertical link 42, and a lower bracket 45, and the cutting mechanism 25 is suspended in a vertically swingable manner.
The configuration of the upper support portion of the vertical swing link mechanism 40 will be described. Shaft holes are opened in the left-right direction before and after the vertical plate portion 63c and the side plate portion 63d, and the upper portion of the front vertical link 41 and the upper portion of the rear vertical link 42 of the vertical swing link mechanism 40 are supported by pivot shafts 43 and 44, respectively. It is configured to pivot.

The lower bracket 45 is formed by bending a plate body in a substantially U shape in rear view, shaft holes are opened in the left and right directions at the front and rear portions of the lower bracket 45, and the front vertical link 41 is formed at the front portion of the lower bracket 45. Are fitted together so that the shaft hole on the front side of the lower bracket 45 and the shaft hole opened in the lower part of the front vertical link 41 are aligned and pivotally supported by the pivot shaft 46 so as to be rotatable in the front-rear direction. In addition, the lower part of the rear vertical link 42 is fitted to the rear part of the lower bracket 45 so that the shaft hole in the rear part of the lower bracket 45 and the shaft hole opened in the lower part of the rear vertical link 42 are aligned with each other by the pivot shaft 47. It is pivotally supported.
Thus, the cutting attachment bracket 63, the front vertical link 41, the rear vertical link 42, and the lower bracket 45 constitute a parallel link mechanism, and the cutting mechanism 25 attached to the lower bracket 45 can be swung in a substantially horizontal state. It becomes.

On the lower surface of the lower bracket 45, stays 48 and 49 are projected downward in parallel in the front-rear direction. A shaft hole is opened in the stays 48 and 49 in the front-rear direction. The upper end of the provided support body 70 is supported by a pivot shaft 71 so as to be able to swing left and right. Thus, the mowing mechanism 25 can be swung left and right at the lower part of the vertical rocking link mechanism 40, and can be adjusted to the inclination of the mowing surface (ridge surface).
The cutting mechanism 25 includes left and right cutting covers 72L and 72R, left and right cutting blades housed in the cutting covers 72L and 72R, a hydraulic motor 32 that rotationally drives the cutting blades, and front and rear gauge wheels 73 and 74, respectively. Etc. However, the configuration of the cutting mechanism 25 is not limited, and the number of cutting blades may be one or three or more. The cutting blade is not limited to a blade type, and may be a clipper type, a reel type, or the like. Good.

  In the configuration as described above, when the vehicle travels without performing the cutting operation, the hydraulic cylinder 54 is reduced to raise the cutting mechanism 25, the fixing pin 67 is pulled out, and the front lateral link 61 and the rear lateral link are connected. 62 is rotated in the front-rear direction so that the fixing hole of the upper plate 55b and the intermediate plate 55c of the connection bracket 55 is aligned with the adjustment hole 66a of the rotation fixing plate 66, and the fixing pin 67 is inserted. The front lateral link 61 and the rear lateral link 62 can be fixed in the front-rear direction. In this state, the reaping mechanism 25 is positioned behind the traveling unit, so that stable traveling is possible.

  In addition, when performing mowing work, for example, when performing cutting between adjacent ridges after mowing the rice paddy, the fixed pin is moved to the mowing start position and the mowing mechanism 25 is raised. 67, the front lateral link 61 and the rear lateral link 62 are pivoted sideways until the mowing mechanism 25 is positioned above the heel, and the upper plate 55b and the intermediate plate 55c of the connection bracket 55 are pivoted. The fixing pin 67 is inserted and fixed so that the fixing hole and the adjustment hole 66a of the rotation fixing plate 66 are aligned with each other. When the front lateral link 61 and the rear lateral link 62 are pivoted sideways, the cutting mechanism 25 is always directed in the front-rear direction because the front-rear pivoting parallel link mechanism 60 is composed of parallel links. It has become. Therefore, it is not necessary to adjust the orientation of the cutting mechanism 25 when projecting sideways.

  The hydraulic cylinder 54 is extended in a state of projecting to the side, the mowing mechanism 25 is lowered, the engine 22 on the mowing apparatus 20 side is started, the hydraulic pump 23 is driven at the rated speed, and the mowing lever 27 is turned on. ”To move the traveling unit 1 forward so that the mowing work can be performed. When the cutting mechanism 25 is extended to the side, it is in an eccentric state with respect to the traveling unit 1, so that the weight balance is lost. Since the cutting operation is performed while pulling to the lift, the lifting link mechanism 5 is not subjected to a large load, and the running stability is not greatly degraded.

  As described above, the machine base 21 attached to the rear portion of the traveling unit 1 of the rice transplanter, the engine 22 mounted on the machine base 21, and the hydraulic pressure driven by the engine 22 and mounted on the machine base 21. The hydraulic pump 23 is connected to a hydraulic oil tank 24 that supplies hydraulic oil to the hydraulic pump 23 and is mounted on the machine base 21, and is connected to the rear part of the traveling unit 1 via the lifting link mechanism 5. The hydraulic pump 23 that feeds the pressure oil to the hydraulic motor 32 that drives the cutting mechanism 25 is driven by the engine 22 provided on the machine base 21. Since it can always drive irrespective of 1 clutch operation and traveling speed, the grass cutting work can be stably performed using the traveling part 1 of the existing rice transplanter. Moreover, since the driving sources of the mowing mechanism 25 and the traveling unit 1 are different, that is, driven by different engines, even when the traveling unit 1 travels on a paddy field and is loaded, the mowing operation can be performed stably. it can. Moreover, since it is not the structure which mounts heavy objects, such as a hydraulic oil tank and a hydraulic pump, in the rear part of the raising / lowering link mechanism 5, even if it is a small rice transplanter, it becomes possible to mount the mowing apparatus 20, and the general purpose of a rice transplanter Can also be improved. Further, since the lifting and lowering of the cutting mechanism 25 is lifted and lowered by the lifting and lowering link mechanism 5 provided in the traveling unit 1 of the rice transplanter, a hydraulic cylinder for lifting and lowering, an operation member, a hydraulic switching means and the like are not required separately, and the structure is simplified. Cost reduction can also be achieved. Moreover, since the traveling unit 1 is obtained by removing the planting device of the rice transplanter, the vehicle height is high, and not only in the paddy field, but also in the field where vegetables are cultivated, and roads with rubble and stones. Etc., and mowing work can be performed on the surrounding ridges and slopes from within the field, or on the ridges and slopes from the road side.

  Further, since the machine base 21 is detachably attached to the machine body frame 2 and the rear axle case 8 of the traveling unit 1, the machine base 21 can be easily attached and detached, and sufficient rigidity can be secured.

  Further, an operating tool mounting bracket 26 is disposed on the left and right front portions of the machine base 21, and a cutting lever 27 serving as an operating tool for switching the oil feed to the hydraulic motor 32 is provided near the seat 10 of the traveling unit 1. Since they are arranged, the engine 22, the hydraulic pump 23, the hydraulic oil tank 24, and the operation tool can be attached and detached as one unit, and can be easily replaced and assembled. Further, when attaching / detaching, it is not necessary to remove the hydraulic piping connecting the hydraulic pump 23, the hydraulic oil tank 24, and the operation tool, and the piping can be configured to be short.

Next, an embodiment in which the mowing apparatus 20 is mounted on the riding management machine 80 instead of the traveling unit 1 of the rice transplanter will be described with reference to FIG. The same points as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
The riding management machine 80 includes a well-known four-wheel type traveling unit 83, a traveling and working engine 85 is placed on the front part of the body frame 84, and the front wheel 86 is supported at the front lower part of the body frame 84. The rear wheel 87 is supported at the lower rear part. A maneuvering unit 88 including a steering handle, a seat, and the like is disposed on a midway portion before and after the body frame 84.

A gear box 89 is fixed on the rear part of the machine body frame 84, the PTO shaft 90 projects from the gear box 89, and the power from the engine 85 is transmitted to the gear box 89. Power can be transmitted to the hydraulic pump 23 fixed on 84. However, the arrangement position of the PTO shaft 90 is not limited. The hydraulic motor 32 of the cutting mechanism 25 is driven by the pressure oil from the hydraulic pump 23. In this way, it is possible to reduce the cost by omitting the working engine and driving the hydraulic pump 23 of the mowing apparatus 20 by the traveling engine 85 of the riding management machine 80.
Further, the hydraulic oil tank 24 is placed on the rear portion of the machine body frame 84. However, the hydraulic pump 23 and the hydraulic oil tank 24 may be configured to be detachable as a unit by mounting and fixing on the machine base 21 so that the machine base 21 can be fixed at an arbitrary position on the machine body frame 84. .

Further, a rear elevating link mechanism 81 is disposed at the rear of the machine body frame 84 and is configured to be moved up and down by a hydraulic cylinder 91. A front elevating link mechanism 82 is disposed at the front portion of the body frame 84 and is configured to be moved up and down by a hydraulic cylinder 92. In addition, although the back raising / lowering link mechanism 81 and the front raising / lowering link mechanism 82 are comprised by the parallel link mechanism in this embodiment, it is also possible to comprise by a 3 point link type, a 2 point link type, etc.
A connecting bracket 55 is configured to be detachable at the rear portion of the rear lifting link mechanism 81 or at the front portion of the front lifting link mechanism 82. However, the connection bracket 55 may be attached by the simple detachable simple hitch 97 described above.

The cutting bracket 25 is attached to the connecting bracket 55 via the front / rear rotation parallel link mechanism 60 and the vertical swing link mechanism 40 in the same manner as described above.
With this configuration, the cutting mechanism 25 can be operated by the engine 85 provided in the riding management machine 80, the structure can be simplified and the cost can be reduced, and the hydraulic pump 23 and the hydraulic oil tank 24 are also supported by the support frame. 29, the mounting stay 21a, etc. are not required and can be easily mounted on the body frame 84. The front / rear rotation parallel link mechanism 60, the up / down swing link mechanism 40, and the cutting mechanism 25 can be moved up and down by the rear lifting link mechanism 81 or the front lifting link mechanism 82 provided in the riding management device 80, and the configuration of the lifting mechanism is simple. In addition, the lifting / lowering and PTO operation means can be shared, and the cost can be reduced. In particular, in the case of the configuration in which the cutting mechanism 25 is attached to the front lifting link mechanism 82, the operator can perform the cutting operation while facing forward, so that workability can be improved and the front-rear weight balance can also be improved. .

As described above, the mowing device 25 has the mowing mechanism 25 attached to the rear portion of the traveling unit 1 (83) of the work vehicle via the link mechanism, and is driven up and down by the hydraulic cylinders 54 (91 and 92) provided in the work vehicle. The elevating link mechanism 5 (81, 82), the connecting bracket 55 attached to the rear part of the elevating link mechanism 5 (81, 82), and one end of the elevating link mechanism 5 (81, 82) arranged in parallel in the front-rear direction by a shaft member in the vertical direction. A front / rear rotation parallel link mechanism 60 composed of a front lateral link 61 and a rear lateral link 62 pivoted, and a cutting mechanism 25 pivotally supported at the other end of the front lateral link 61 and the rear lateral link 62. A cutting attachment bracket 63 for suspending the frame, and a rotation position fixing means 59 for fixing the rotation position of the front lateral link 61 or the rear lateral link 62 with respect to the connection bracket 55. Therefore, the harvesting mechanism 25 can also be raised and lowered by moving the lifting and lowering link mechanism 5 (81 and 82) up and down by the hydraulic cylinders 54 (91 and 92) provided in the work vehicle. Cylinders, hydraulic pumps, piping, switching valves, and the like are no longer required, reducing weight and reducing costs. Therefore, even a small work vehicle can be mounted and operated.
Further, the left and right positions of the mowing mechanism 25 can be changed by rotating the front / rear rotating parallel link mechanism 60. At this time, since the direction of the cutting mechanism 25 is not changed in the front-rear direction because it is constituted by the parallel link, it is not necessary to provide a member for adjusting the horizontal direction of the cutting mechanism 25 on the cutting attachment bracket 63, and it is inexpensive. Can simplify the structure.

  Further, since the elevating link mechanism 5 is constituted by a parallel link mechanism by the upper link 51 and the lower link 52, the elevating link mechanism 5 is constituted by a parallel link mechanism. There is no need to provide a member for adjusting the vertical direction of the mechanism 25, that is, a member for adjusting the mowing mechanism horizontally, and the structure can be simplified at low cost.

  Further, the cutting attachment bracket 63 suspends the cutting mechanism 25 via the vertical swing link mechanism 40, and the other end of the front / rear rotation parallel link mechanism 60 is pivoted on one side of the cutting attachment bracket 63. A support portion is formed, and on the other side of the cutting attachment bracket 63 on the left and right sides, an upper pivot support portion of the vertical swing link mechanism 40 is formed. Since the pivotal support portion of the mechanism 40 is integrally configured, the weight can be reduced with a simple configuration.

DESCRIPTION OF SYMBOLS 5 Lifting link mechanism 25 Cutting mechanism 40 Vertical rocking link mechanism 51 Upper link 52 Lower link 54 Hydraulic cylinder 55 Connection bracket 55
59 Rotation position fixing means 60 Forward / backward rotation parallel link mechanism 61 Front lateral link 62 Rear lateral link 63 Mowing mounting bracket

Claims (3)

A mowing device for attaching a mowing mechanism to a rear portion of a work vehicle via a link mechanism, and an elevating link mechanism that is driven up and down by an actuator provided in the work vehicle;
A connecting bracket attached to the rear of the elevating link mechanism;
A front-rear rotating parallel link mechanism comprising a front lateral link and a rear lateral link, one end of which is arranged in parallel with the connecting bracket and pivotally supported by a vertical shaft member;
A cutting attachment bracket that pivotally supports the other end of the front lateral link and the rear lateral link and suspends a cutting mechanism;
A mowing apparatus comprising a rotation position fixing means for fixing a rotation position of the front lateral link or the rear lateral link with respect to the connection bracket.   The mowing apparatus according to claim 1, wherein the elevating link mechanism includes a parallel link mechanism including an upper link and a lower link.   The mowing attachment bracket suspends the mowing mechanism through a vertical swing link mechanism, and a pivotal support portion at the other end of the front / rear rotation parallel link mechanism is formed on one side of the mowing attachment bracket. The mowing apparatus according to claim 1, wherein an upper pivot support portion of the vertical swing link mechanism is formed on the left and right sides of the bracket.

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