JP5789159B2 - Reversible bottom plow working machine - Google Patents

Description

  The present invention relates to a reversible bottom plow working machine, and in particular, the present invention can be used for a reversible bottom plow working machine for hill cutting in which both left and right wheels of a tractor are plowed in a horizontal state on the ground. The present invention relates to a reversible bottom plow working machine that can also be used for a grooved reversible bottom plow working machine that drops a wheel to a low position such as a plowed groove and plows a tractor in a tilted state.

  In the past, there have been cases of farming a number of fields that have become larger as the scale of farming grows.Therefore, it is possible to move from one field to another, so-called movement between fields, and back and forth from the rear storage location to the field. You may travel on a general road.

  The reversible bottom plow work machine has a fixed frame that is attached to the tractor with a mast, a reversing frame that can be reversed by a reversing hydraulic circuit, an oblique frame that is attached to the reversing frame, and a plane symmetrical arrangement above and below the oblique frame. And a reversing cylinder provided between the mast and the reversing frame, a stopper attached to the mast and restraining the reversing frame, and a lock cylinder for operating the stopper (see Patent Document 1).

  By the way, when the reversible bottom plow work machine is moved between fields, the lifted posture tends to impair running stability of the tractor. The aircraft will stick out of the driving lane, causing a traffic accident.

  Therefore, the work implement is not in the work posture, but in a neutral posture in which the oblique frame is rotated about 90 degrees from the work posture, and in the horizontal posture with the bottoms connected in the left-right direction (referred to as the moving posture). Is configured to select a lock position where pressure oil does not flow to either position of the switching valve of the reverse hydraulic circuit.

  However, when the work implement is in a neutral state, the left and right balance is not balanced due to the construction of the work implement, and the upper side is heavy and does not stop at full neutrality. The neutral posture of the work machine may be disturbed and reversed due to unexpected swinging caused by the level difference of the work, etc. In addition to the work machine posture that is larger than the width of the tractor, the work machine should change to an unpredictable posture If it is dangerous and severe, it may cause an accident to roll over with the tractor, and countermeasures are required from the viewpoint of traffic safety.

  Further, since the switching of the hydraulic position is generally performed by manual switching, there is a possibility of an erroneous operation, and there is a concern that the locked state is suddenly released due to a trouble in the hydraulic system.

  As described above, it is required to maintain the neutral posture without changing the posture of the work machine during the movement of the tractor on the road. For this reason, it is indispensable to adopt a means for reliably holding the neutral posture of the work machine. .

  Therefore, the present applicant, in a state where the reversing frame is in a neutral posture along the vertical plane during the reversing operation, protrudes a stopper with a lock cylinder into the rotation region of the reversing frame and engages with the engaging portion of the reversing frame. A configuration has been proposed in which the reversible bottom plow work machine is prevented from being changed unexpectedly during movement on the road by enabling the reversal frame to be held in a neutral posture (see Patent Document 1).

Japanese Patent No. 4634739

  In the invention according to Patent Document 1, the reversal frame can be reliably held in a neutral posture by the stopper, and stability during movement can be ensured. However, it is not easy for a person to operate the oil pressure to rotate the reversal frame and to catch the timing when the neutral state is reached, and to cause the stopper to protrude with the lock cylinder.

  In general, the reversible bottom plow working machine is, as a general rule, plowing work while keeping the bottom plow parallel to the field surface with the reversal frame in a horizontal state. However, even in the working state, it is necessary to hold the inverted frame tilted from the horizontal state.

  For example, when using a reversible bottom plow working machine as a hill working machine, in plowing work, there should be no unplowed dredging along the edge of the work start side of the field to be plowed in the field. First, the reversal frame may be held in a slightly inclined state from the horizontal state, and mouth opening plowing may be performed along the edge on the work start side.

  In such a case, conventionally, a bolt that regulates the angle with respect to the reversal frame is provided on the fixed frame side, and the projecting state of the bolt is adjusted by hand each time. However, there is a problem that such adjustment is troublesome.

  The present invention is intended to solve the above-described conventional problems, and includes a state in which the reversal frame is in a neutral posture state by hydraulic operation without requiring the operation of causing the stopper to protrude by the lock cylinder. It is an object of the present invention to realize a reversible bottom plow working machine that can be reliably held at a desired angle.

  In order to solve the above-described problems, the present invention provides a fixed frame that includes a mast and is attached to a tractor, an inverted frame that is pivotally supported by the fixed frame, an oblique frame that is attached to the inverted frame, and an oblique frame In a reversible bottom plow working machine comprising a bottom arranged symmetrically on the upper and lower sides of the cylinder, and a reversing hydraulic cylinder provided between the mast and the reversing frame, the reversing hydraulic cylinder includes a cylinder cylinder, a main piston, The piston rod and the adjustment piston are provided, and the base end of the reversing hydraulic cylinder is pivotally attached to the upper part of the mast, and the tip end of the piston rod is eccentric from the axial center pivotally supported by the fixed frame in the reversing frame. The maximum extension position of the reversing hydraulic cylinder is maintained by adjusting and maintaining the position of the adjustment piston. Adjustment is possible to provide a reversible bottom plow working machine, wherein the working position and inverting the frame inversion frame faces the lateral width direction is configured to be held in one of two states: a neutral position along the mast.

  In order to solve the above-described problems, the present invention provides a fixed frame that includes a mast and is attached to a tractor, an inverted frame that is pivotally supported by the fixed frame, an oblique frame that is attached to the inverted frame, and an oblique frame In a reversible bottom plow working machine comprising a bottom arranged symmetrically on the upper and lower sides of the cylinder, and a reversing hydraulic cylinder provided between the mast and the reversing frame, the reversing hydraulic cylinder includes a cylinder cylinder, a main piston, An adjustment piston, a piston rod, and a hollow tube in the cylinder cylinder, and a base end portion of the cylinder cylinder is pivotally attached to an upper portion of the mast, and a tip end portion of the piston rod is a fixed frame in the reversing frame. It is pivotally mounted at an eccentric position from the pivoted shaft center, and the piston rod is formed integrally with the main piston, and the adjustment piston is Oppositely slidably penetrates and extends outward from the tip of the cylinder tube, and a cavity is formed toward the tip. The cavity communicates with a space formed between the main piston and the adjustment piston. A communication hole is formed, and the hollow cylinder tube extends into the cavity of the piston rod through the main piston from the base end portion of the cylinder cylinder so as to be relatively slidable. By adjusting and maintaining the amount of oil on the tip side of the adjustment piston, the maximum extension position of the reversing hydraulic cylinder can be adjusted, with the reversing frame facing in the horizontal direction and the reversing frame in the neutral position along the mast. Provided is a reversible bottom plow working machine characterized by being configured to be held in any state.

  In order to solve the above problems, the present invention provides a fixed frame attached to a tractor with a mast, an inverted frame, an oblique frame attached to the inverted frame, and a bottom arranged symmetrically on the upper and lower sides of the oblique frame. And a reversible bottom plow working machine provided with a reversing hydraulic cylinder provided between the mast and the reversing frame, the reversing frame extends in the working width direction at each work position of the bottom and can rotate to the fixed frame. The reversing hydraulic cylinder is provided with a cylinder cylinder, a main piston, an adjustment piston, a piston rod, and a hollow cylinder in the cylinder cylinder. It is pivotally attached to the upper part, and the tip of the piston rod is in an eccentric position from the axial center pivotally supported by the fixed frame in the front frame. The adjustment piston is arranged in the cylinder cylinder on the tip side of the cylinder cylinder from the main piston, and the piston rod is formed integrally with the main piston and penetrates the adjustment piston so as to be relatively slidable. And a communication hole that extends outward from the front end of the cylinder tube and has a cavity formed from the main piston side toward the front end side, and communicates with the space formed between the main piston and the adjustment piston. The cylinder cylinder hollow tube extends from the base end portion of the cylinder cylinder so as to be relatively slidable through the main piston and into the cavity of the piston rod. The maximum extension position of the reversing hydraulic cylinder can be adjusted by adjusting and maintaining the amount of oil on the tip side. The work posture in which the reversing frame faces in the horizontal direction and the reversing frame are Providing reversible bottom plow working machine, characterized in that the structure to be held in one of two states: a neutral position along the.

  An extension hydraulic path is communicated with the base end side of the main piston in the cylinder cylinder, an adjustment hydraulic path is communicated with the distal end side of the adjustment piston in the cylinder cylinder, and the cylinder base is connected to the cylinder cylinder hollow tube. It is preferable that the shortening hydraulic passage that penetrates the end portion is communicated.

  By adjusting and maintaining the amount of oil on the tip side of the adjustment piston in the cylinder cylinder, the maximum extension position of the piston rod is adjusted, and the angle with respect to the mast of the reversal frame of the work posture facing in the horizontal direction is arbitrarily selected and held It is preferable that the configuration be made possible.

  In order to solve the above-described problems, the present invention provides a fixed frame that is attached to a tractor with a mast, an inverted frame that is pivotally supported by the fixed frame, an oblique frame that is attached to the inverted frame, and an oblique frame. In a reversible bottom plow working machine comprising a bottom arranged symmetrically in the vertical direction and a reversing hydraulic cylinder provided between a mast and a reversing frame, the reversing hydraulic cylinder has cylinder cylinders in series with each other. A first cylinder and a second cylinder, the first cylinder including a main piston and a piston rod formed integrally with the main piston, and the second cylinder being integrated with the adjustment piston and the adjustment piston; The tip of the adjustment rod of the reversing hydraulic cylinder or the tip of the piston rod is The tip of the piston rod or the tip of the adjustment rod is pivoted at a position eccentric from the axis pivotally supported by the fixed frame in the reversing frame, and the position of the adjustment piston is adjusted. The maximum extension position of the reversing hydraulic cylinder can be adjusted by maintaining the reversing hydraulic cylinder, and the reversing frame can be held in either the working posture in which the reversing frame faces in the lateral width direction or the neutral posture along the mast. A reversible bottom plow working machine is provided.

  According to the present invention, since the hydraulic cylinder that adjusts the stroke of the piston rod is provided in the hydraulic cylinder that operates the rotation of the reversing frame, the stopper provided on the fixed frame side projects from the reversing frame. The neutral posture can be easily adjusted without requiring a complicated structure and troublesome labor to stop, and the neutral posture can be surely brought into a restrained state. Therefore, the reversible bottom plow working machine can be moved safely when moving on the road between fields.

  In addition, if necessary, adjustment and holding of the tilt angle of the reversing frame with respect to the fixed frame can be performed very easily and stably. It can be adjusted and stable plowing work can be performed.

It is a figure explaining Example 1 of the reversible bottom plow working machine of the present invention, and is a perspective view in the working posture of a reversible bottom plow working machine. It is a side view in the working posture of the reversible bottom plow working machine of Example 1 of the present invention. It is a top view in the working posture of the reversible bottom plow working machine of Example 1 of the present invention. It is a rear view in the working posture of the reversible bottom plow work machine of Example 1 of the present invention. It is a perspective view in the neutral attitude | position (movement attitude | position) of the reversible bottom plow working machine of Example 1 of this invention. It is a side view in the neutral attitude | position (movement attitude | position) of the reversible bottom plow work machine of Example 1 of this invention. It is a top view in the neutral attitude | position (movement attitude | position) of the reversible bottom plow working machine of Example 1 of this invention. It is a rear view in the neutral attitude | position (movement attitude | position) of the reversible bottom plow work machine of Example 1 of this invention. It is a perspective view explaining the principal part in the neutral attitude | position (movement attitude | position) of the reversible bottom plow work machine of Example 1 of this invention. It is a perspective view explaining the principal part in the working posture of the reversible bottom plow work machine of Example 1 of the present invention. It is a perspective view explaining the principal part in the work standing posture of the reversible bottom plow working machine of Example 1. (A) is a figure explaining the hydraulic cylinder for inversion of Example 1 of this invention, (b) is a principal part enlarged view of (a). It is a figure explaining operation | movement of the hydraulic cylinder for inversion of Example 1 of this invention, and is the figure which looked at the hydraulic cylinder for inversion and the inversion frame from the back of the work advancing direction. It is a figure explaining operation | movement of the hydraulic cylinder for inversion of Example 1 of this invention, and is the figure which looked at the hydraulic cylinder for inversion and the inversion frame from the back of the work advancing direction. It is a figure explaining operation | movement of the hydraulic cylinder for inversion of Example 1 of this invention, and is the figure which looked at the hydraulic cylinder for inversion and the inversion frame from the back of the work advancing direction. It is a figure explaining the hydraulic circuit of Example 1 of this invention. It is a figure explaining the mechanism of the rotational drive of the lower link for raising the reversible bottom plow working machine in Example 1 of this invention. It is a figure explaining the hydraulic cylinder for inversion and its hydraulic circuit of Example 2 of the reversible bottom plow work machine of the present invention.

  EMBODIMENT OF THE INVENTION The form for implementing the reversible bottom plow working machine which concerns on this invention is demonstrated below with reference to drawings based on an Example.

(overall structure)
A first embodiment of a reversible bottom plow working machine 1 according to the present invention will be described with reference to FIGS. 1 to 8 are views showing a state in which a reversible bottom plow work machine 1 (hereinafter also simply referred to as “work machine”) is attached to the tractor 2.

  1 to 4 show working postures for performing the hilling work of the reversible bottom plow working machine 1 in a farm field, and FIGS. 5 to 8 show the reversible bottom plow working machine 1 in a neutral position when moving between farm fields, for example. The neutral posture (moving posture) in the state is shown.

  As shown in FIGS. 1, 6, 9 to 11, etc., the reversible bottom plow working machine 1 includes a fixed frame 3, an inversion frame 6, and an oblique frame 7. The fixed frame 3 is a frame that is connected to the tractor 2 and is not inverted as shown in FIGS. 1 and 9 and the like, and the inverted frame 6 is attached with an oblique frame 7 provided with bottoms 42 and 43, and 180 ° It can be reversed before and after.

  The fixed frame 3 includes a lower horizontal frame 8 and a mast 11 that stands substantially vertically from the center of the horizontal frame 8 (see FIG. 9). The fixed frame 3 can be connected to the tractor 2 by attaching the lower link 12 of the tractor 2 to the left and right ends of the horizontal frame 8 at the attachment portion 15 and attaching the upper link 13 of the tractor 2 to the mast 11.

  The lower link 12 is schematically shown in FIG. 17, and is rotatably attached to a part of the tractor 2. A base portion of a link rod 14 is pivotally attached to the lower link 12. The distal end portion of the link rod 14 is pivotally attached to the distal end portion of the link arm 19. The link arm 19 is rotatably attached to the upper portion of the tractor 2, and the tip of the piston rod 20 of the hydraulic cylinder 16 attached to the tractor 2 is pivotally attached.

  With such a configuration, when the hydraulic cylinder 16 operates, the link arm 19 is driven to rotate, and the tip of the lower link 12 moves up and down via the link rod 14 to move the reversible bottom plow work machine 1 up and down. It can be moved up and down in the direction.

  In FIG. 17, the hydraulic cylinder 16 is attached to the link arm 19, and the link arm 19 is directly rotated. However, as another configuration, although not shown, the hydraulic cylinder 16 is attached to the tractor 2 to be rotatable. It is good also as a structure which attaches the hydraulic cylinder 16 to the rotating shaft of the link arm 19 via the crank fixed to the rotating shaft.

  The upper link 13 is for attaching the reversible bottom plow working machine 1 to the tractor 2 and is not a main part of the present invention. Therefore, the upper link 13 is not illustrated and will not be described in detail, but the length is adjusted to a part of the upper link 13. A container (for example, a structure composed of two shafts that can be screwed together to adjust the length) is provided. By making the length of the upper link 13 adjustable in this way, the working plowing depth of the reversible bottom plow working machine 1 can be adjusted in a side view state. The shorter the plowing depth, the shorter the plowing depth. Become.

  As shown in FIG. 3, the reverse frame 6 includes a front frame 17, a main frame 18, and a connecting frame 21. The oblique frame 7 is attached at the front end of the front frame 17 and the front end of the main frame 18.

  3, the front frame 17 is arranged to extend in the work width direction (left-right direction with respect to the work progress direction), and the main frame 18 is arranged to extend in the work progress direction (front-rear direction). ing.

  The connection frame 21 is disposed obliquely so as to connect the base end portion of the front frame 17 and the front end of the main frame 18. The oblique frame 7 is fixed to the front end portion of the front frame 17 and the rear end portion of the main frame 18 via brackets 22 and 23, respectively, and is inclined obliquely with respect to the front-rear direction so as to cross the working width direction. They are arranged in a cross.

  In the first embodiment, as shown in FIG. 3, the reversal frame 6 includes a front frame 17, a main frame 18, and a connecting frame 21, and an oblique frame 7 is attached. However, the shape in plan view made by these is not particularly limited as long as it has sufficient strength and a function for attaching a bottom as a reversible plow working machine.

  For example, as in the invention described in Patent Document 1, the reversal frame 6 may include a front frame and a main frame, and may have a substantially triangular shape in plan view together with the oblique frame 7.

  As shown in FIGS. 9 to 11, the rotary shaft 26 fixed to one end portion of the front frame 17 of the reversing frame 6 and extending forward is placed in a pipe 27 provided at the center in the left-right direction of the horizontal frame 8 of the fixed frame 3. It is rotatably supported by a provided bearing. As shown in FIGS. 9 to 11, the mounting portion 36 of the base end portion 33 of the cylinder cylinder 32 of the reversing hydraulic cylinder 31 is pivotally attached to the pivotal support portion 28 at the upper end of the mast 11 of the fixed frame 3.

  As shown in FIGS. 9 and 11, the attachment portion 38 at the tip of the piston rod 37 of the reversing hydraulic cylinder 31 is a pivot portion provided on the front surface of the front frame 17 at a position eccentric from the axis of the rotary shaft 26. 41 is pivotally attached. By the expansion and contraction of the reversing hydraulic cylinder 31, the reversing frame 6 can be reversed by about 180 ° as described above.

  As shown in FIGS. 1, 2, and 4, a plurality of bottoms 42 and 43 are mounted on the oblique frame 7 vertically and symmetrically with respect to each other in the working posture. That is, with the plane including the oblique frame 7 as a symmetrical plane, a plurality of right-inverted bottoms 42 are attached to the upper and lower sides of the plane, and a plurality of left-inverted bottoms 43 are attached to the other side symmetrically. . In the present specification, the reason for calling “bottom of right inversion” and “bottom of left inversion” is as follows.

  In the state shown in FIGS. 1 to 4, the plurality of bottoms 42 facing the farm field are cultivated when viewed from the rear of the work progression direction with respect to the work progression direction in the hill-climbing work on the outward path in the farm field. When done, the soil is plowed and flipped to the right. Accordingly, such a plurality of bottoms 42 are referred to as “right-inverted bottoms”.

  Although not shown, the front frame 17 of the reversing frame 6 is substantially directed leftward about the rotating shaft 26 by the reversing hydraulic cylinder 31 with respect to the traveling direction in the hill climbing operation on the return path in the field. When the plowing operation is performed when the bottom 43 facing the field is viewed from the rear in the work progress direction, the soil is plowed, and is held in a horizontal state reversed 180 ° (left-reversed state). The soil is flipped to the left. Therefore, such a plurality of bottoms 43 are referred to as “left inverted bottoms”.

  A plurality of coulters 46 and 47 are attached to the oblique frame 7 in the upper and lower sides (lower and upper in FIGS. 1 and 2) symmetrically with respect to each other. The plurality of upper and lower coulters 46 and 47 (lower and upper in FIGS. 1 and 2) are arranged corresponding to positions in front of the plurality of left-inverted bottoms 43 and the plurality of right-inverted bottoms 42, respectively.

  As described above, a plurality of bottoms 43 and 42 and a plurality of coulters 46 and 47 are provided on the upper and lower sides of the oblique frame 7 so that the reversing work can be performed. This is a conventional reversible bottom plow working machine. (See Patent Document 1)

  Furthermore, the gauge frame 48 is attached to the oblique frame 7 at the front part and the rear part in the longitudinal direction.

  FIG. 10 shows a case where the front frame 17 of the reversing frame 6 is held in a substantially horizontal state with respect to the mast 11 by the reversing hydraulic cylinder 31. In this case, as shown in FIGS. 1 to 4, the plurality of right-inverted bottoms 42 face the field scene and are in the working posture of the reversible bottom plow work machine 1.

  From this state, when the front frame 17 of the reversal frame 6 is reversed by approximately 180 ° with respect to the mast 11 by the reversing hydraulic cylinder 31, and as shown in FIG. The left-reversed bottom 43 faces the farm scene and is in a left-reversed state, which is the working posture of the reversible bottom plow work machine 1.

  As shown in FIG. 9, when the front frame 17 is held in a parallel state along the mast 11 by the reversing hydraulic cylinder 31, the reversible bottom plow working machine 1 is As shown in FIGS. 8 to 8, the plurality of right-inverted bottoms 42 and the plurality of left-inverted bottoms 43 are both lifted and held upward at the same height to be in a neutral posture (moving posture).

(Hydraulic cylinder device)
The above is the basic configuration of the reversible bottom plow working machine 1 according to the present invention. Hereinafter, the hydraulic cylinder that further positions and holds the reversal frame 6, which is a characteristic configuration of the present invention, at a desired rotational position. The device 51 will be described.

  The hydraulic cylinder device 51 includes a reversing hydraulic cylinder 31 and a hydraulic circuit 52 as shown in FIGS.

Reversing hydraulic cylinder configuration:
12A and 12B are diagrams illustrating the configuration of the reversing hydraulic cylinder 31. FIG. The reversing hydraulic cylinder 31 includes a cylinder cylinder 32, a main piston 53 that reciprocates in the cylinder cylinder 32, an adjustment piston 56 that can move in the cylinder cylinder 32, a piston rod 37, and a cylinder cylinder hollow tube 57. And.

  As described above, the attachment portion 36 of the base end portion 33 of the cylinder cylinder 32 of the reversing hydraulic cylinder 31 is pivotally attached to the pivot portion 28 at the upper end of the mast 11 (see FIGS. 9 to 11). The tip 34 of the cylinder cylinder 32 seals the cylinder cylinder 32. At the base end of the cylinder cylinder 32, an extension hydraulic path 58 is attached so as to communicate with the cylinder cylinder 32.

  The adjustment piston 56 has a donut shape and is provided in the cylinder cylinder 32 on the tip side from the main piston 53. An adjustment hydraulic path 61 is attached so as to communicate with the cylinder cylinder 32 on the tip side of the adjustment piston 56.

  The piston rod 37 is formed to extend from the main piston 53 to the distal end side of the cylinder cylinder 32. The piston rod 37 is formed in a tubular shape (hollow shape) and has a hollow portion 62 that is closed at the tip. The cavity 62 is formed up to the proximal end of the piston rod 37.

  The piston rod 37 slidably passes through the adjustment piston 56 on the tip end side, extends outward through the tip end portion 34 of the cylinder cylinder 32, and an attachment portion 38 at the tip end of the front end of the reversing frame 6. It is pivotally attached to the pivot portion 41 of the frame 17 (see FIGS. 9 to 11).

  The piston rod 37 is formed integrally with the main piston 53 at its base end (is formed integrally with the main piston 53 or is fixed to the main piston 53 and integrated). As shown in FIGS. 12A and 12B, the piston rod 37 has a cavity 62 and a periphery of the piston rod 37 at the position adjacent to the main piston 53 and the main piston 53 and the adjustment piston. A communication hole 67 that communicates with the space 66 in the cylinder cylinder 32 between 56 is formed.

  The in-cylinder hollow tube 57 is formed as a hollow tube, passes through the base end portion 33 of the cylinder tube 32, and is fixed to the base end portion 33. The cylinder cylinder hollow tube 57 passes through the axial center of the cylinder cylinder 32 from the base end portion 33 of the cylinder cylinder 32, and further, the distal end side penetrates so as to be slidable relative to the main piston 53. The piston rod 37 extends into the cavity 62.

  Even in a shortened state in which the piston rod 37 enters the cylinder cylinder 32 most, the cylinder cylinder hollow tube is arranged so that the tip of the cylinder cylinder hollow tube 57 does not hit the inner end of the cavity 62 of the piston rod 37. The length of 57 is fixed. The main piston 53 slides in the cylinder cylinder 32 along the cylinder cylinder hollow tube 57. A shortening hydraulic path 68 is attached so as to communicate with the base end of the cylinder cylinder hollow tube 57.

Working principle of reversing hydraulic cylinder:
The operating principle of the reversing hydraulic cylinder 31 configured as described above is as follows. The position of the adjustment piston 56 is adjusted by the amount of oil supplied from the adjustment hydraulic path 61 to the space 71 between the adjustment piston 56 and the tip 34 of the cylinder cylinder 32.

  For example, in FIG. 13A, a predetermined amount of oil is supplied from the adjustment hydraulic path 61 to the space 71 between the adjustment piston 56 and the tip end portion 34 of the cylinder cylinder 32 and is maintained, whereby the adjustment piston 56 is maintained. Is the position indicated by P1 in the figure. Then, oil is supplied from the extension hydraulic path 58 into the space 72 on the proximal end side of the main piston 53 of the cylinder cylinder 32, and the piston rod 37 is adjusted piston piston 37 that is adjusted and maintained at the position P1. 56.

  From this state, when the oil in the cylinder cylinder 32 is returned to the extension hydraulic path 58 and supplied to the shortening hydraulic path 68, the oil passes through the cylinder cylinder hollow tube 57, as shown in FIG. As described above, the air flows into the space 66 between the main piston 53 and the adjustment piston 56 from the communication hole 67, and presses the main piston 53 toward the base end side of the cylinder cylinder 32. Accordingly, as shown in FIG. 13B, the piston rod 37 is shortened and moved to the position of the top dead center.

  After the piston rod 37 passes through the position of the top dead center, when oil is supplied from the expansion hydraulic path 58 into the cylinder cylinder 32, the main piston 53 expands, as shown in FIG. In contrast to FIG. 13A, the state is reversed by approximately 180 °.

  The reciprocating operation of the main piston as described above is the basic operation of the reversing hydraulic cylinder 31. By this operation, the reversing frame 6 is reversing approximately 180 °, and the reversible bottom plow working machine 1 is reversing each other. It becomes possible to reverse to any state of the posture.

  When the reversible bottom plow work machine 1 is moved between farm fields or the like, when both the left reversing bottom 43 and the right reversing bottom 42 are in the same upward moving posture, the reversing frame 6 is parallel to the mast 11. Must be in a neutral state (see FIG. 9).

  In such a neutral state, as shown in FIG. 15 (b), a predetermined amount of oil is supplied from the adjustment hydraulic path 61 to the space 71 between the adjustment piston 56 and the tip end 34 of the cylinder cylinder 32. By maintaining this, the adjustment piston 56 is set to a position P2 close to the base end portion 33 of the cylinder cylinder 32.

  When the adjustment piston 56 is set to such a position P2, the main piston 53 is regulated at the position (top dead center position) shown in FIG. 15B, and in this state, the extension hydraulic path 58 and the shortening hydraulic path If the oil supply and recovery are stopped at 68, the piston rod 37 is stopped and maintained at the position shown in FIG. With the above operation, the inversion frame 6 can be maintained in a neutral state with respect to the mast 11.

  Further, when the reversible bottom plow work machine 1 is set to the working state, the angle of the reversing frame 6 with respect to the field scene is adjusted and maintained, so that the plurality of left reversing bottoms 43 or the plurality of right reversing bottoms in the working posture state are provided. The angle of 42 can be adjusted and maintained.

  The angle of the reversal frame 6 is adjusted by supplying or collecting oil from the adjustment hydraulic path 61 into the cylinder cylinder 32 so that the adjustment piston 56 is positioned at the position P3 shown in FIG. Alternatively, it is set to the position P4 shown in FIG. Thereby, the maximum extension position of the piston rod 37 can be adjusted.

  If the supply and recovery of oil are stopped in the extension hydraulic path 58 and the shortening hydraulic path 68 at the maximum extension position of the piston rod 37, the piston rod 37 is stopped and maintained at that position. Become. In this way, by adjusting the angle of the reversal frame 6 with respect to the farm scene, it is possible to adjust and maintain the inclination angles of the plurality of bottoms 42 and 43 in the working posture. As a result, a mouth opening operation or the like can be performed.

Hydraulic circuit:
As shown in FIG. 16, the hydraulic circuit 52 includes an extension hydraulic path 58 for sending oil to the space 72 on the proximal end side of the cylinder cylinder 32 from the main piston 53, and a space 71 on the distal end side of the cylinder cylinder 32 from the adjustment piston 56. An adjustment hydraulic path 61 for sending oil to the cylinder, a shortening hydraulic path 68 for sending oil to the cylinder cylinder hollow tube 57, and a valve switching device 73 are provided.

  The extension hydraulic path 58 communicates a tank 76, which is an oil supply source, with a space 72 on the proximal end side of the cylinder cylinder 32 via a pump 77, a slow return valve 78, and a check valve 81, and the oil is supplied to the cylinder cylinder. 32 is supplied into the space 72 on the base end side. In addition, there is an extension oil recovery path 82 that branches in the middle of the extension hydraulic path 58 and that recovers oil from the extension hydraulic path 58 to the tank 76 via the valve switching device 73.

  The shortening hydraulic path 68 communicates between the cylinder hollow tube 57 and the valve switching device 73. When the piston rod 37 is shortened when the reversing frame 6 is rotated, oil is passed from the tank 76 through the shortening hydraulic path 68 via the pump 79 and the valve switching device 73 to the cylinder cylinder hollow tube 57. To supply.

  When the piston rod 37 is extended, the oil is sent from the extension hydraulic path 58 to the space 72 on the base end side of the cylinder cylinder 32. At the same time, the oil in the space 66 is supplied to the cylinder cylinder hollow tube 57 and It is sent to the valve switching device 73 through the shortening hydraulic path 68 and collected in the tank 76.

  The adjustment hydraulic path 61 communicates the tank 76 with the space 71 on the tip side of the adjustment piston 56 of the cylinder cylinder 32 via the pump 83, the slow return valve 86 and the check valve 87. In adjusting the position in the room, oil is supplied to the space 71 on the tip end side of the cylinder cylinder 32.

  In addition, an adjustment oil recovery path 90 that branches in the middle of the adjustment hydraulic path 61 and communicates with the shortening hydraulic path 68 via the relief valve 91 is provided. The adjustment oil recovery path 90 allows the oil from the adjustment hydraulic path 61 to flow through the relief valve 91 to the shortening hydraulic path 68 and be recovered to the tank 76 via the valve switching device 73.

(Function)
The operation of the reversible bottom plow working machine 1 according to the present invention having the above configuration will be described below through its operation method and the like.

(1) Hilling work FIGS. 1-4 has shown the working attitude | position of the reversible bottom plow working machine 1 for performing a hilling work in an agricultural field. This is a work posture in which the inverted frame 6 and the oblique frame 7 are substantially parallel to the field, and the plurality of right-turned bottoms 42 plow the field at an equal depth. Plowing is carried out by hilling on the forward path from one end to the other.

  In this working posture, as shown in FIG. 13A, the adjustment piston 56 is set at a position P <b> 1 on the tip side of the cylinder cylinder 32. Then, oil is supplied from the extension hydraulic path 58 to the space 72 on the base end side of the cylinder 32, and the main piston 53 is pushed to a position regulated by the adjustment piston 56.

  As a result, the piston rod 37 of the reversing hydraulic cylinder 31 is extended and held to the maximum extension position regulated by the adjustment piston 56, as shown in FIG. In this state, as shown in FIG. 10, the front frame 17 of the reversal frame 6 is in a substantially horizontal position on the right side of the mast 11 with respect to the work traveling direction.

  Then, when the uphill hilling operation from one end to the other end of the field is completed, the direction of the tractor 2 is reversed at the other end of the field, and the backhilling operation is performed from the other end of the field to the one end. First, the reversal frame 6 is reversed by approximately 180 ° by the reversing hydraulic cylinder 31, and the left reversing bottom 43 and the right reversing bottom 42 which are in the vertical position are reversed vertically as shown in FIGS. Then, the left inverted bottom 43 is moved downward so as to face the farm field.

  Specifically, this inversion operation is performed as follows. First, in the mechanism for rotationally driving the lower link 12 shown in FIG. 17, the hydraulic cylinder 16 is operated to raise the lower link 12 and lift the reversible bottom plow working machine 1.

  In this state, by operating the reversing hydraulic cylinder 31 and reciprocating the main piston 53, the piston rod 37 of the reversing hydraulic cylinder 31 is shortened from the position of FIG. 13A (FIG. 13B). )), And then extended to the extended position of FIG. 13 (c). As a result, the reversal operation of the reversal frame 6 is approximately 180 °.

  In the hillside operation, as described above, the reversal frame 6 and the oblique frame 7 are substantially parallel to the field surface, and a plurality of left reversal bottoms 43 or a plurality of right reversal bottoms 42 are formed on the field surface as a whole. Plowing work is performed at an equal depth without tilting up and down.

  However, when performing a mouth opening operation or the like in a hillside operation, the plurality of left-inverted bottoms 43 or the plurality of right-inverted bottoms 42 are held while being tilted vertically with respect to the field surface as a whole. Sometimes it is done.

  In this case, oil is adjusted from the adjustment hydraulic path 61 and the tip 63 of the cylinder cylinder so that the reversal frame 6 and the oblique frame 7 are inclined at a predetermined angle from the horizontal state with respect to the field surface. And the position of the adjustment piston 56 is adjusted. Then, the extension position of the piston rod 37 is restricted to be shorter or longer than the normal work position (see FIG. 13A).

  For example, as shown in FIG. 14A, the adjustment piston 56 is adjusted to the position P3. Then, the oil is supplied to the extension hydraulic passage 58 and the supply and recovery of the oil in the shortening hydraulic passage 68 are stopped in a state where the piston rod 37 is extended to the maximum extension position regulated by the adjustment piston 56.

  Then, as shown in FIG. 14 (a), the piston rod 37 holds the reversal frame 6 in an inclined state. In this case, among the plurality of right reversal bottoms 42, the left (base end side) bottoms. Mouth opening work is performed.

  In addition, when the hill operation is performed with the bottom inclined, the adjustment piston 56 is adjusted and held so as to be positioned at the position P4 on the tip side of the cylinder cylinder 32 further than the position P3 shown in FIG. You may do it. In this case, as shown in FIG. 14 (b), the right side (front end side) bottoms of the plurality of right-inverted bottoms 42 enter a relatively deep depth in the soil of the field, so that it is possible to puff or plow the grooves. Is possible.

(2) Growing work When the wheeling work is performed by dropping the wheel on one side of the tractor 2 into the groove made by the tilling work of the previous process, the tractor 2 is inclined, but the work is performed facing the field. The plurality of right-inverted bottoms 42 or left-inverted bottoms 43 to be carried out are maintained horizontally as a whole and plow the field scene at a certain depth.

  For this purpose, oil is adjusted from the adjusting hydraulic passage 61 so that the reversing frame 6 and the oblique frame 7 are held horizontally with respect to the tractor 2 and the mast 11 inclined in the working posture. As shown in FIG. 15A, the position P5 of the adjustment piston 56 is adjusted. Then, the extension position of the piston rod 37 is regulated.

  Then, oil is supplied to the extension hydraulic path 58 and the oil is supplied to and recovered from the extension hydraulic path 58 and the shortening hydraulic path 68 in a state where the piston rod 37 is extended to the maximum extension position regulated by the adjustment piston 56. As shown in FIG. 15 (a), the reversing frame 6 has a substantially horizontal posture with respect to the farm field.

  Thus, although not shown, the tractor 2 and the mast 11 are inclined, and the plurality of bottoms (in this example, the right inversion bottoms) are maintained in a horizontal state, and the leveling operation is performed without adjusting the level screw. Can be performed.

(3) Movement between fields, etc. When moving the reversible bottom plow working machine 1 between fields, etc., as in the case of performing the above reversing operation, the lower link 12 is first raised, and the reversible bottom plow working machine 1 is lifted.

  Then, oil is supplied from the adjustment hydraulic passage 61 to the space 71 between the adjustment piston 56 and the distal end portion 63 of the cylinder cylinder 32, and the adjustment piston 56 is connected to the proximal end of the cylinder cylinder 32 as shown in FIG. The position P2 is set close to the portion 33. When the adjustment piston 56 is set to such a position P2, the main piston 53 is restricted at the position shown in FIG. 15B, and does not move any further downward.

  If the supply and recovery of the oil in the extension hydraulic path 58 and the shortening hydraulic path 68 are stopped in the state where the main piston 53 is in such a state, the piston rod 37 is moved to the top dead center as shown in FIG. 9 and the reversal frame 6 is in a neutral posture in which it rises upward along the mast 11 as shown in FIG.

As a result, the left-reversing bottom 43 and the right-reversing bottom 42 provided on the oblique frame 7 are held at the upper positions as shown in FIGS. 5 to 8, and the reversible bottom plow work machine 1 is set to the neutral state. Neutral posture (moving posture). Therefore, it is possible to pass safely without passing the work implement from the width of the tractor in a narrow alley or passing the oncoming vehicle while moving.

  As described above, the reversible bottom plow working machine 1 according to the present invention is adjusted by the amount of oil supplied from the adjustment hydraulic path 61 to the space 71 between the adjustment piston 56 and the tip end portion 63 of the cylinder cylinder 32. The position of the adjustment piston 56 can be adjusted and held easily and freely.

  As a result, the angle of the reversal frame 6 and the oblique frame 7 with respect to the horizontal surface of the mast 11 can be adjusted, so that the angles of the left reversing bottom 43 and the right reversing bottom 42 with respect to the field surface can be freely adjusted and held. Is possible.

  In addition, when moving between fields, as shown in Patent Document 1, the reversible bottom plow work machine 1 is set to a neutral position by inserting a pin into the neutral position from the mast side as compared with a configuration in which the neutral position is maintained. Easy to adjust and hold.

  FIG. 18 is a view for explaining a second embodiment of the reversible bottom plow working machine according to the present invention. The second embodiment is different from the first embodiment only in the configuration of the reversing hydraulic cylinder, and the other configurations are the same as those of the first embodiment. Therefore, hereinafter, the configuration of the reversing hydraulic cylinder will be mainly described, and the same reference numerals are used for portions common to the first embodiment.

  The reversing hydraulic cylinder 92 according to the second embodiment is characterized in that two hydraulic cylinders are provided in series. In the reversing hydraulic cylinder 92 shown in FIG. 18, one cylinder cylinder 93 is partitioned by a partition wall 96, one of which is used as the first cylinder chamber 98 of the first hydraulic cylinder 97, and the other is the second hydraulic cylinder 101. The second cylinder chamber 102 is used.

  The first hydraulic cylinder 97 is provided with an adjustment piston 103 and an adjustment rod 106 that is integral with the adjustment piston 103. The tip 107 of the adjustment rod 106 is pivotally attached to the pivot 28 of the mast 11. A first extension hydraulic path 108 and a first shortening hydraulic path 111 are connected to the proximal end side (partition wall 96 side) and the distal end side of the first cylinder chamber 98 with the adjustment piston 103 interposed therebetween. ing.

  The second hydraulic cylinder 101 is provided with a main piston 112 and a piston rod 113 integral with the main piston 112. The tip 116 of the piston rod 113 is pivotally attached to the pivotal support 41 of the front frame 17 of the reversing frame 6. A second extension hydraulic path 117 and a second shortening hydraulic path 118 are connected to the base end side (partition wall 96 side) and the distal end side of the second cylinder chamber 102 with the main piston 112 interposed therebetween, respectively. It has been.

  In the second embodiment, the outline of the hydraulic circuit 121 for supplying and returning oil to the first hydraulic cylinder 97 and the second hydraulic cylinder 101 will be described with reference to FIG.

  Oil is supplied from the tank 122 to the first extension hydraulic passage 108 and the first shortening hydraulic passage 111 by the first pumps 123 and 124 via the check valves 127 and 128, respectively, Adjust to position. This state can be maintained by setting the first pumps 123 and 124 to a stopped state.

  In this state, alternate supply and return of oil from the tank 122 to the second extension hydraulic path 117 and the second shortening hydraulic path 118 of the second hydraulic cylinder 101 are performed by the third pump 131 through the switching valve 132. Thus, the reciprocating operation of the second hydraulic cylinder 101 is performed, and the reversing operation of the reversing frame 6 is enabled.

  For example, it is assumed that the second hydraulic cylinder 101 is in a state in which the main piston rod 113 is extended during the plowing work in the forward path in the field. In this state, when the oil in the second cylinder chamber 102 and the second extension hydraulic circuit 117 remains in the check valve 135 and the relief valve 134, the piston rod 113 maintains the extended state. .

  When reaching the headway on the opposite side by plowing work in the field, the reversible bottom plow working machine 1 is lifted, the reversing frame 6 is reversed 180 °, and the right reversing bottom 42 is replaced with the left reversing bottom 43, The return path plowing work is performed in the field with the left inverted bottom 43 facing down.

  When the reversal frame 6 is reversed by 180 °, in FIG. 18, the supply and return of alternate oil to the second extension hydraulic path 117 and the second shortening hydraulic path 118 of the second hydraulic cylinder 101 are hydraulically performed. Although performed by the switching circuit 130, the configuration of the hydraulic pressure switching circuit 130 will be described together with its operation.

  In the state shown in FIG. 18, the partition wall 96 of the main piston 112 in the second cylinder chamber 102 of the second hydraulic cylinder 101 is passed from the tank 122 by the third pump 131 through the filter 133, the switching valve 132 and the second shortening hydraulic path 118. When oil is supplied into the space on the opposite side, the main piston 112 is pushed into the second hydraulic cylinder 101 and the piston rod 113 is shortened.

  At the same time, pilot pressure is applied to the pilot circuit 137 to open the check valve 135. Therefore, the oil pushed out by the main piston 112 flows from the second extension hydraulic passage 117 through the oil passage 139 having the orifice 138 and the check valve 135 toward the switching valve 132 and is further returned to the tank 122. .

  On the other hand, when the main piston 112 is pushed into the second hydraulic cylinder 101 and is completely shortened, the relief valve 134 is opened by the hydraulic pressure of the pilot circuit 145 in the oil passage 144.

  Then, the oil from the oil passage 144 flows through the relief valve 134, and the spool of the switching valve 132 is pushed against the spring by the hydraulic pressure of the pilot circuit 146, and from the state of FIG. The portion 142 indicated by the arrow moves to the left, and the switching operation of the switching valve 132 is performed.

  When the switching valve 132 is switched, the oil is supplied from the tank 122 by the third pump 131 through the filter 133, the switching valve 132 and the oil passage 143, the check valve 135, the orifice 138, and the second extension hydraulic passage 117. It is supplied to the two cylinder chamber 102. Further, the switched state of the switching valve 132 is temporarily held by the holding circuit 147.

  As a result, oil is supplied to the space on the partition wall 96 side of the main piston 112 in the second cylinder chamber 102 of the second hydraulic cylinder 101. As a result, the main piston 112 moves in the extending direction, and the piston rod 113 extends from the second hydraulic cylinder 101.

  At this time, the oil that has flowed into the second extension hydraulic path 117 simultaneously flows into the relief valve 134 to apply pressure, and the relief valve 134 that has been opened by the pressure from the pilot circuit 145 is closed. The oil pushed out by the main piston 112 passes through the switching valve 132 and is returned to the tank 122 from the second shortening hydraulic path 118.

  When the main piston 112 is moved to the most extended side and the piston rod 113 is fully extended, the pilot pressure by the spring of the switching valve 132 acts, and the switching valve 132 returns to the original state shown in FIG. Also, the holding operation by the holding circuit 147 ends. Through such a series of operations, the inversion frame 6 is inverted by 180 °.

(Function)
The overall operation of the reversing hydraulic cylinder 92 of the second embodiment having the above configuration will be described below. In the first hydraulic cylinder 97, oil is appropriately supplied to the first extension hydraulic circuit 108 and the first shortening hydraulic circuit 111, respectively, to adjust the position of the adjustment piston 103.

  For example, when the maximum extension length of the entire reversing hydraulic cylinder 92 is shortened, oil is supplied so that the adjustment piston 103 is positioned on the partition wall 96 side, and the length by which the adjustment rod 106 protrudes from the first cylinder chamber 98. Adjust to a shortened state.

  Conversely, when the maximum extension length of the entire reversing hydraulic cylinder 92 is increased, oil is supplied so that the adjustment piston 103 is positioned on the side opposite to the partition wall 96, and the adjustment rod 106 protrudes from the first cylinder chamber 98. Adjust the length to be extended.

  Thus, after adjusting the position of the adjustment piston 103, the first pumps 123 and 124 are stopped, and the movement of the oil in the first extension hydraulic circuit 108 and the first shortening hydraulic circuit 111 is restricted and adjusted. The movement of the piston 103 and the adjusting rod 106 is restricted, and the protruding length of the adjusting rod 106 is kept constant.

  With the protruding length of the adjusting rod 106 kept constant, oil is supplied from the second hydraulic circuit 117 or the second shortening hydraulic circuit 118 of the second hydraulic cylinder 101, returned, and the piston rod 113 is expanded and By performing the shortening, the inversion operation of the inversion frame is performed.

  According to the reversing hydraulic cylinder 92 of the second embodiment configured as described above, even if the reciprocating stroke of the piston rod 113 by the second hydraulic cylinder 101 is constant, the extension length of the entire hydraulic cylinder device can be adjusted. . Therefore, the second embodiment of the reversible bottom plow working machine can perform the same operation as the first embodiment.

  In the above description, the first hydraulic cylinder 97 is used as a hydraulic cylinder for adjusting the maximum extension length of the reversing hydraulic cylinder 92 as a whole, and the second hydraulic cylinder 101 is used as a rotating cylinder for driving the reversing frame. The configuration. However, conversely, the first hydraulic cylinder 97 is used as a hydraulic cylinder for rotating the reverse frame, and the second hydraulic cylinder 101 is used as a hydraulic cylinder for adjusting the maximum extension length of the entire reverse hydraulic cylinder 92. It is good.

  As mentioned above, although the form for implementing the reversible bottom plow work machine concerning the present invention was explained based on the example, the present invention is not limited to such an example, and is described in a claim. It goes without saying that there are various embodiments within the scope of technical matters.

  Since the reversible bottom plow working machine according to the present invention has the above-described configuration, the inclination angle of the reversal frame can be easily adjusted, and thus is extremely useful for hill working and grooving work in a field.

DESCRIPTION OF SYMBOLS 1 Reversible bottom plow work machine 2 Tractor 3 Fixed frame 6 Inverted frame 7 Oblique frame 8 Horizontal frame of fixed frame 11 Mast of fixed frame 12 Lower link 13 Upper link 14 Link rod 15 Mounting part for attaching horizontal frame to lower link 16 Work Hydraulic cylinder for lifting machine 17 Front frame 18 Main frame 19 Link arm 20 Piston rod of hydraulic cylinder for lifting working machine 21 Connecting frame 22, 23 Bracket 26 Rotating shaft 27 Pipe 28 Mast pivot 31 Hydraulic cylinder for reversal 32 Cylinder tube 33 Base end portion of cylinder tube 34 Tip portion of cylinder tube 36 Cylinder tube mounting portion 37 Piston rod 38 Piston rod tip mounting portion 41 Front frame pivoting portion 42 Right-reversing bottom 43 Left-reversing bottom 46, 47 Coulter 48 Gauge wheel 51 Hydraulic cylinder device 52 Hydraulic circuit 53 Main piston 56 Adjustment piston 57 Cylinder hollow tube 58 Extension hydraulic path 61 Adjustment hydraulic path 62 Piston rod cavity 63 End of cylinder cylinder 66 Space 67 Communication hole 68 Shortening hydraulic path 71 Space between the adjustment piston and the tip of the cylinder cylinder 72 Space on the base end side from the main piston of the cylinder cylinder 73 Valve switching device 76 Tank 77, 79, 83 Pump 78 Slow return Valve 81, 87 Check valve 82 Oil recovery path for extension 86 Slow return valve 90 Oil recovery path for adjustment 91 Relief valve 92 Reverse hydraulic cylinder 93 Cylinder cylinder 96 Bulkhead 97 First hydraulic cylinder 98 First cylinder chamber 101 Second hydraulic cylinder 102 Second cylinder chamber 103 Adjustment piston 106 Adjustment rod 107 Tip end of adjustment rod 108 First extension hydraulic circuit 111 First shortening hydraulic circuit 112 Main piston 113 Piston rod 116 Piston rod tip 117 117 Second extension hydraulic circuit 118 Second shortening hydraulic circuit 121 Hydraulic circuit 122 Tank 123 First pump 124 Second pump 127, 128 Check valve 130 Hydraulic switching circuit 131 Third pump 132 Switching valve 133 Filter 134 Relief valve 135 Check valve 136, 138, 141 Orifice 137, 145, 146 Pilot circuit 139, 143, 144 Oil passage 142 Part of switching valve 147 Holding circuit

Claims (5)

A fixed frame that is attached to the tractor with a mast, an inverted frame that is pivotally supported on the fixed frame, an oblique frame that is attached to the inverted frame, and a bottom that is symmetrically disposed above and below the oblique frame. In a reversible bottom plow working machine comprising a reversing hydraulic cylinder provided between a mast and a reversing frame,
The reversing hydraulic cylinder includes a cylinder cylinder, a main piston, an adjustment piston, a piston rod, and a hollow cylinder in the cylinder cylinder,
The base end portion of the cylinder tube is pivotally attached to the upper portion of the mast, and the tip end portion of the piston rod is pivotally attached to a position eccentric from the axial center pivotally supported by the fixed frame in the reverse frame,
The piston rod is formed integrally with the main piston, extends through the adjustment piston so as to be relatively slidable and extends outward from the tip of the cylinder tube, and a cavity is formed toward the tip. A communication hole communicating with the space formed between the main piston and the adjustment piston is formed,
The cylinder cylinder hollow tube extends through the main piston from the base end of the cylinder cylinder so as to be relatively slidable, and extends into the cavity of the piston rod.
By adjusting and maintaining the amount of oil on the tip side of the adjustment piston in the cylinder cylinder, the maximum extension position of the reversing hydraulic cylinder can be adjusted, and the work posture in which the reversing frame faces in the horizontal direction and the reversing frame in the mast A reversible bottom plow working machine characterized by being configured to be able to be held in any state of a neutral posture along. A fixed frame that is attached to the tractor with a mast , an inversion frame, an oblique frame attached to the inversion frame, a bottom disposed symmetrically on the upper and lower sides of the oblique frame, and provided between the mast and the inversion frame. In a reversible bottom plow working machine comprising a hydraulic cylinder for reversal,
The reversal frame extends in the work width direction at each work position of the bottom, and is pivotally supported by the fixed frame.
The reversing hydraulic cylinder includes a cylinder cylinder, a main piston, an adjustment piston, a piston rod, and a hollow cylinder in the cylinder cylinder,
The base end portion of the cylinder cylinder is pivotally attached to the upper portion of the mast, and the tip end portion of the piston rod is pivotally attached to a position that is eccentric from the axial center pivotally supported by the fixed frame in the front frame ,
The adjustment piston is disposed in the cylinder cylinder on the tip side of the cylinder cylinder from the main piston,
The piston rod is formed integrally with the main piston, passes through the adjustment piston so as to be relatively slidable, and extends outward from the tip of the cylinder tube, and a hollow portion is formed from the main piston toward the tip. In addition, a communication hole that communicates with the space formed between the main piston and the adjustment piston is formed from the hollow portion,
The cylinder cylinder hollow tube extends through the main piston from the base end of the cylinder cylinder so as to be relatively slidable, and extends into the cavity of the piston rod.
By adjusting and maintaining the amount of oil on the tip side of the adjustment piston in the cylinder cylinder, the maximum extension position of the reversing hydraulic cylinder can be adjusted, and the work posture in which the reversing frame faces in the horizontal direction and the reversing frame in the mast A reversible bottom plow working machine characterized by being configured to be able to be held in any state of a neutral posture along. An extension hydraulic path is communicated with the base end side of the main piston in the cylinder cylinder, an adjustment hydraulic path is communicated with the distal end side of the adjustment piston in the cylinder cylinder, and the cylinder base is connected to the cylinder cylinder hollow tube. The reversible bottom plow working machine according to claim 1 or 2, wherein a shortening hydraulic passage that penetrates through the end portion is communicated. By adjusting and maintaining the amount of oil on the tip side of the adjustment piston in the cylinder cylinder, the maximum extension position of the piston rod is adjusted, and the angle with respect to the mast of the reversal frame of the work posture facing in the horizontal direction is arbitrarily selected and held The reversible bottom plow working machine according to claim 1, 2 or 3 , characterized in that the construction is possible . A fixed frame that is attached to the tractor with a mast, an inverted frame that is pivotally supported on the fixed frame, an oblique frame that is attached to the inverted frame, and a bottom that is symmetrically disposed above and below the oblique frame. In a reversible bottom plow working machine comprising a reversing hydraulic cylinder provided between a mast and a reversing frame,
The reversing hydraulic cylinder includes a first cylinder and a second cylinder arranged in series with each other.
The first cylinder includes a main piston and a piston rod formed integrally with the main piston, and the second cylinder includes an adjustment piston and an adjustment rod formed integrally with the adjustment piston,
The tip of the adjustment rod or the tip of the piston rod of the reversing hydraulic cylinder is pivotally attached to the upper part of the mast, and the tip of the piston rod or the tip of the adjustment rod is pivotally supported by a fixed frame in the reversing frame. It is pivotally attached to a position that is eccentric from the axis
By adjusting and maintaining the position of the adjustment piston, the maximum extension position of the reversing hydraulic cylinder can be adjusted, and either the working posture with the reversing frame facing the horizontal direction or the neutral posture with the reversing frame along the mast A reversible bottom plow working machine characterized by being configured to be capable of being held in the machine.

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