JP4895871B2 - Agricultural machine - Google Patents

Description

  The present invention relates to a farm work machine, and in particular, a farm work machine having a simple and low-cost structure and capable of selecting whether or not to allow a work unit to follow a work surface regardless of an operator's operation and skill. About.

  In a type of a coater that works by fixing the position of the working unit of the coater with respect to a conventional traveling machine, it is necessary for the operator to drive the truck to follow the running machine. .

Further, in Patent Document 1, when the working part has moved away from the work surface, the pressure detection sensor detects a pressure decrease from the working part, and extends the telescopic cylinder so that the sliding arm slides. Thus, an invention is described in which the working part is not separated from the work surface.
JP 2006-262828 A

  However, since the work of the hull coater is a work for repairing the cold of the main fence on one side of the traveling machine body, the traveling machine body should be made to follow the former machine while taking into account the reaction force from the working part of the hull coater. The operator's skill was greatly affected in driving operation.

  Moreover, in the invention described in Patent Document 1, a pressure detection sensor is required, and setting of an electric system for that is required. Furthermore, after the pressure detection sensor detects a decrease in pressure, the telescopic cylinder starts to move, and the telescopic cylinder moves until the pressure value from the pressure detection sensor again exceeds a certain value. Due to the inertial force of the cylinder, it was confirmed that the working part was pushed in even after it touched the work surface. This caused a problem that the formed hot springs were easily broken and the appearance was not good.

  Furthermore, when it is not desired to form the heel along the main fence, or when the working section is moved to a non-working position, there is a case where the function for the working section to follow the main fence is not necessary.

  In view of the above-described problems, the present invention is a simple and low-cost structure in a plaster coating machine, and whether or not to allow the working unit to function so as to follow the marshal regardless of the operation and skill of the operator. An object of the present invention is to provide a coater that can be selected.

  In order to achieve the above object, an agricultural machine according to the present invention has a mounting portion attached to a rear portion of a traveling machine body and attached to the traveling machine body, and a working unit that performs work by power from the traveling machine body, In the offset working machine in which the mounting unit and the working unit are connected by a link mechanism that allows the working unit to move in a direction in which the working unit is in contact with or separated from the work surface at least during the work of the working unit. Is mounted with a hydraulic cylinder divided by a piston and having a pressure in one cylinder chamber set higher than the pressure in the other cylinder chamber so that the working part is urged toward the work surface side, In the hydraulic circuit of the hydraulic cylinder, there is a valve for reducing the pressure when the pressure in the cylinder chamber with the higher pressure is higher than a certain pressure, and a bypass for bypassing the valve for reducing the pressure. And scan circuit, characterized in that a a switching valve that determines via the bypass circuit or through the valve.

  The farm work machine according to the present invention includes a mounting portion that is attached to a rear portion of the traveling machine body and is attached to the traveling machine body, and a working unit that performs work by power from the traveling machine body, and the mounting unit and the work In an offset working machine connected by a link mechanism that allows the working part to move in a direction in which the working part comes into contact with or separates from the work surface at least when the working part is working, the link mechanism is divided by a piston. A hydraulic cylinder capable of switching which one of the two cylinder chambers is set to a higher pressure is mounted so that the working unit can be moved by the link mechanism by expansion and contraction of the hydraulic cylinder. In the hydraulic circuit of the hydraulic cylinder, the pressure in the cylinder chamber whose pressure is set high so that the working part is biased toward the work surface side is equal to or higher than a certain pressure. A valve for reducing the pressure in the case, characterized the bypass circuit for bypassing the valve for causing the vacuum, in that a a switching valve that determines via the bypass circuit or through the valve.

  Furthermore, the agricultural machine according to the present invention is characterized in that the switching of the switching valve can be switched manually or electrically. Furthermore, the agricultural machine of the present invention is characterized in that the link mechanism is a quasi-parallel link mechanism or a parallel link mechanism. Further, in the agricultural machine according to the present invention, the link mechanism includes an intermediate frame that connects the mounting portion and the working portion, and the intermediate frame is rotatable in a horizontal direction provided in the mounting portion. A mounting part side fulcrum and a working part side fulcrum provided on the working part side, which is pivotable in the horizontal direction, and the hydraulic cylinder is connected to the mounting part and the intermediate frame, It is characterized in that each fulcrum provided separately from the mounting part side fulcrum is mounted so as to be connected. Furthermore, the agricultural machine according to the present invention is characterized in that the constant pressure in the valve for reducing the pressure equal to or higher than the predetermined pressure can be adjusted by an adjusting member provided in the valve.

  According to the present invention, it is possible to make a selection as to whether or not to allow the working unit to function so as to follow the marshal regardless of the operation and skill of the operator, with a simple and low-cost structure in the plastering machine. .

  The best mode for carrying out the present invention will be described.

FIG. 1 is a plan view showing an embodiment of a glazing machine according to a first embodiment of the present invention.
The mounting part 11 has attachment parts 12 to 14 to the tractor 2 and is connected to the tractor. The working unit 40 includes a pre-processing unit 36 and a hook forming unit 37. The pre-processing unit 36 includes a tilling claw 35 and the like, and performs an operation of cutting out the old fence and scraping out the soil. On the other hand, the cocoon forming part 37 is located behind the pre-processing part 36 and is constituted by a disk or the like, and performs an operation of painting the scraped soil into a cocoon shape.

  The mounting portion 11 and the working portion 40 are provided on the mounting portion side, the first arm 21 connecting the first fulcrum 16 provided on the mounting portion side and the fourth fulcrum 32 provided on the working portion side. The second fulcrum 18 is connected to the second arm 22 connecting the third fulcrum 31 provided on the working part side. These four fulcrums are fulcrums that allow any arm to rotate horizontally. Furthermore, the first arm 21 is longer than the second arm 22, and these arms are mounted substantially in parallel. Yes. In this way, the mounting portion 11 and the working portion 40 are connected by a pseudo parallel link using arms having different lengths.

  In addition, the transmission of power from the tractor is transmitted to the working unit 40 from, for example, an input shaft (not shown) provided in the mounting unit via the joint 23, and in the working unit 40, a gear, a bevel gear, a shaft Alternatively, the power is transmitted to the pretreatment unit 36 and the hook forming unit 37 via a chain or the like.

  Further, in FIG. 1, a cylinder 15 is attached to the pseudo parallel link.

  FIG. 2 is a hydraulic circuit diagram showing an embodiment of a cylinder in the present invention. The cylinder 15 is based on hydraulic pressure, and the cylinder chamber of the cylinder 15 is divided into a first cylinder chamber 51 and a second cylinder chamber 52 by a piston 53. In FIG. 2, the first switching valve connects the first channel 55 and the fifth channel 64. The second switching valve 63 is in a state where the pump 58 and the second flow path 57 are connected, and the tank 59 and the fourth flow path 61 are connected. Therefore, pressure is applied to the first cylinder chamber 51 through the second flow path 57, the first flow path 55, and the fifth flow path 64 by the pump 58. The second cylinder chamber 52 communicates with the tank 59 from the fourth flow path 61. As a result, the first cylinder chamber 51 is at a higher pressure than the second cylinder chamber 52 and is in a state where pressure is applied to the side where the rod 54 of the cylinder is always extended (to the left in FIG. 2).

  On the other hand, a valve 56 is provided between the second flow path 57 and the first flow path 55. This valve is configured to allow oil to flow from the third flow path 60 to the tank 59 when a set pressure exceeding a certain level is applied. That is, when a pressure higher than a certain level is applied, the pressure is reduced. Thereby, for example, when a force is applied from the rod 54 in the direction of contracting the cylinder 15 (to the right in FIG. 2), a high pressure is applied to the first cylinder chamber 51. It is also transmitted to the valve 56 through the first flow path 55. In that case, when the applied pressure is a set pressure or more, the pressure is reduced as described above. Thereby, it is possible to prevent the rod 54 from being applied with a force exceeding a certain level.

  Examples of the valve 56 include a pressure reducing valve and a relief valve. The pressure reducing valve is structured such that when a spool provided in the valve reaches a certain pressure or more, the pressure is reduced by moving against a force of a pressure adjusting spring provided in the spool. In addition, the relief valve is configured such that when the valve body provided in the valve reaches a certain pressure or more, the pressure is reduced by moving against the force of the pressure adjusting spring provided in the valve body. That is, in the present invention, it is possible to apply a valve having a mechanism for reducing the pressure when the valve body provided inside the valve moves against the force of the elastic body that urges the valve body when the pressure exceeds a set pressure. .

  Furthermore, the pressure reducing valve and the relief valve can adjust a constant pressure to be reduced by adjusting the force of a spring provided inside the valve by operating an adjusting member such as a pressure adjusting screw or a handle. Also in the present invention, the force of the elastic body provided inside the valve can be adjusted by an adjusting member such as an adjusting screw or a handle, and the constant pressure to be reduced can be adjusted. In addition, these adjusting members can be electrically operated by a solenoid or the like. As a result, the constant pressure can be adjusted from a position away.

  Here, the second switching valve 63 is switched from the state shown in FIG. 2 so that the pump 58 and the fourth channel 61 are connected to the tank 59 and the second channel 57. Thereby, the pressure from the pump 58 is transmitted from the fourth flow path 61 to the second cylinder chamber 52. As a result, the piston 53 and the rod 54 move to the right in FIG. 2, and the cylinder 15 contracts.

  FIG. 3 is a hydraulic circuit diagram when the first switching valve 62 is switched in FIG. When the first switching valve 62 is switched, the fifth flow path 64 communicating with the first cylinder chamber 51 is connected to the bypass circuit 65. Since the bypass circuit 65 bypasses the valve 56, the pressure by the pump 58 is directly transmitted from the bypass circuit 65 and the fifth flow path 64 to the first cylinder chamber 51. For this reason, even if the pressure in the first cylinder chamber 51 is increased, the valve 56 does not reduce the pressure. This allows one to quickly move the rod 54 in the direction of extension of the rod 54 (left side in FIG. 3) by the pump 58 as compared to when the valve 56 operates, and the other from the rod 54 to the cylinder. Even when a force in the contracting direction (right side in FIG. 3) is applied to the cylinder 15, the cylinder 15 is not decompressed by the valve 56 and is not contracted.

  Here, similarly to the case of FIG. 2, the second switching valve 63 is switched from the state of FIG. 3, and the pump 58 and the fourth flow path 61 are connected, and the tank 59 and the second flow path 57 are connected. To do. Thereby, the pressure from the pump 58 is transmitted from the fourth flow path 61 to the second cylinder chamber 51. As a result, the piston 53 and the rod 54 move to the right in FIG. 3, and the cylinder 15 contracts.

  The first switching valve 62 and the second switching valve 63 may be switched manually or may be switched electromagnetically. Here, when the electromagnetic switching is performed, a remote operation or the like can be performed by a remote controller or the like. Furthermore, it is possible to set so that these switching operations are automatically switched by control according to the purpose.

  In FIG. 1, the cylinder 15 is mounted between a fulcrum A provided on the mounting portion 11 and a fulcrum B provided on the first arm. These fulcrums are fulcrums that allow the cylinder 15 to rotate in the horizontal direction. As a result, when the cylinder 15 is extended, the working unit 40 moves to the heel 1 side (the right side in FIG. 1) via the pseudo parallel link. Moreover, the valve 56, the 1st switching valve 62, and the 2nd switching valve 63 can be installed in the mounting part 11 as the hydraulic valve 17 of FIG. 1, for example.

FIG. 4 is a plan view illustrating an example when the trouser is mounted on the tractor according to the first embodiment of the present invention.
In the drawing, the cylinder 15 extends from the two-dot chain line at the position on the solid line.
Now, in the case of the hydraulic circuit shown in FIG. 2, the cylinder 15 exerts a force on the extending side due to the pressure of the cylinder 15, whereby the working unit 40 is urged toward the heel 1 side via the pseudo parallel link. Has been. As a result, the working unit 40 can follow the main fence 1. During operation, when a certain force is applied from the rod 1 to the working unit 40 by operating the tractor 2, the force on the side that contracts to the cylinder 15 is applied by the force, and pressure is applied to the cylinder chamber 51. When the set pressure is exceeded, the pressure is reduced by the valve 56. This makes it possible to form a straight ridge without forcibly pressing the heel.

  Further, when the first switching valve 62 is switched as shown in FIG. 3, a strong pressure is applied to the first cylinder chamber 51 by the pressure from the pump 58, and the rod 54 is not decompressed by the valve 56. The cylinder 15 is extended by moving in the extending direction (left side in FIG. 3). As a result, the working unit 40 does not follow the base rod 1 and can be pushed toward the rod side with a strong force. As an example of this, there is a case where the cocoon is desired to be formed in a form in which the cocoon is pushed in more than the original cocoon. Further, at the start of the glazing operation, etc., there is often a strong reaction force toward the reaction side of the working part. In this case as well, the operation is performed with a circuit in which the first switching valve 62 is switched as shown in FIG. It is also effective. Further, by controlling the first switching valve 62, for example, at the beginning of the haze coating operation, the work unit 40 is strongly pressed against the heel side (state of FIG. 3), and after a few seconds, the work unit 40 is returned to the original position. It is possible to follow the heel (state of FIG. 2).

  FIG. 5 is a plan view illustrating an example of a case where the working unit of the wiping machine according to the first embodiment of the present invention is moved to the non-working position. In FIG. 5, the solid line is the position when the working unit 40 is working, and the two-dot chain line is the position when the working unit 40 is moved to the non-working position. Here, when the working unit 40 is at the position of the solid line, the second switching valve 63 is switched from the state of FIGS. 2 and 3 so that the pressure from the pump 58 is transmitted to the second cylinder chamber 52. Shrinks and moves to the position of the two-dot chain line. Thus, the tractor 2 can be safely moved when not working. On the other hand, when moving the working unit 40 from the position of the two-dot chain line in FIG. 5 to the position of the solid line, if the second switching valve 63 is switched to the state of FIG. Is possible. At this time, when the first switching valve 62 is in the state of FIG. 3, there is no pressure reduction by the valve 56, and therefore, the first switching valve 62 can be moved faster than the state of FIG. 2.

  The attachment of the cylinder 15 of the present invention is not limited to FIG. 1. For example, in FIG. 1, when connecting the fulcrum A and the fulcrum mounted on the second arm 22 in FIG. Even when the provided fulcrum C is connected or the like, when the cylinder 15 is extended, the working unit 40 approaches the side of the rod 1 and can be realized.

  2 and 3, a cylinder having a structure in which the rod 54 of the piston 53 is attached in the right direction instead of the left direction in the figure can be applied. In this case, pressure reduction by the valve 56 (in the case of the state of the circuit in FIG. 2) acts when a force is applied to the rod 54 on the extending side. In this case, for example, in FIG. 1, the cylinder can be attached so that the fulcrum D and the first arm 21 or the second arm 22 or the fulcrum C and the first arm 21 are connected. . That is, even when the pressure reducing valve acts when a force is applied to the rod 54 on the extending side, the present invention can be realized if the working unit 40 is mounted so as to move toward the flange 1 when the cylinder contracts. .

  In the first embodiment, the quasi-parallel link is configured so that the working unit 40 moves substantially parallel to the heel in a state where the wiping operation is assumed, as also indicated by the solid line and the two-dot chain line in FIG. In addition, the positional relationship between the arms (21, 22) and the fulcrums (16, 18, 31, 32) is set so that an appropriate wrinkling operation can be performed.

  FIG. 6 is a plan view showing an example of mounting on the tractor of the carburizing machine according to the second embodiment of the present invention. FIG. 7 is a plan view showing an example of the case where the working unit of the wiping machine according to the second embodiment of the present invention is moved to the non-working position. The present Example 2 is a coater having a configuration in which the quasi-parallel link of Example 1 is replaced with a pure parallel link. That is, the first arm 71 and the second arm 72 connecting the mounting portion 77 and the fulcrum (75, 76, 73, 74) provided in the working unit 40 and horizontally rotatable in the second embodiment have the same length. It is configured in parallel. Thereby, the working unit 40 can always move substantially in parallel. Other configurations are the same as those in the first embodiment. Similarly to the first embodiment, the cylinder 15 may be attached to the parallel link mechanism so that the pressure applied by the valve 56 acts when the working unit 40 receives a force from the heel side.

  FIG. 8 is a plan view showing an embodiment of a glazing machine according to Embodiment 3 of the present invention. In the third embodiment, the mounting portion 85 has attachment portions 12 to 14 to the tractor and is connected to the tractor. And the working part 40 has the pre-processing part 36 and the ridge forming part 37 similarly to Example 1, and the pre-processing part 36 has the tilling nail | claw 35 grade | etc., And the work which scrapes off old soil and scrapes soil. Do. On the other hand, the cocoon forming part 37 is located behind the pre-processing part 36 and is constituted by a disk or the like, and performs an operation of painting the scraped soil into a cocoon shape.

  The mounting unit 85 and the working unit 40 are connected by an intermediate frame 83 to a mounting unit side fulcrum 82 provided on the mounting unit 85 side and a working unit side fulcrum 84 provided on the working unit 40 side. The mounting portion side fulcrum 82 and the working portion side fulcrum 84 are fulcrums that allow the intermediate frame 83 to be rotated in the horizontal direction.

  The transmission of power from the tractor is, for example, via a bevel gear from an input shaft provided in the mounting portion, via a shaft concentric with the mounting portion side fulcrum 82 or a bevel gear provided in the intermediate frame. Is further transmitted to the working unit 40 through a shaft that is concentric with the working unit side fulcrum 84, and the preprocessing unit 36 and the like are transmitted through the gear, bevel gear, shaft, chain, or the like in the working unit 40. Power is transmitted to the heel molding portion 37.

  The cylinder 15 connects a fulcrum G provided in the mounting portion and a fulcrum H provided in the intermediate frame. These fulcrums are fulcrums that allow the cylinder 15 to rotate in the horizontal direction. When the cylinder 15 is extended, the intermediate frame rotates counterclockwise around the mounting portion side fulcrum 82 in FIG. The part 40 is configured to move to the heel side.

  The configuration of the cylinder 15 of the third embodiment is the same as that of the first embodiment (FIGS. 2 and 3 and paragraphs 0017 to 0024).

  On the other hand, in the third embodiment, the separate cylinder 88 is attached so as to connect the first separate fulcrum 86 provided on the intermediate frame 83 and the second separate fulcrum 87 provided on the working unit 40 side. These fulcrums are fulcrums that allow the separate cylinder 88 to be rotated in the horizontal direction. When the posture of the working unit 40 changes due to the rotation of the intermediate frame 83, the separate cylinder 88 can correct the angle of the working unit 40 with respect to the heel and keep the angle of the working unit 40 constant with respect to the heel. To do. For example, even when the intermediate frame 83 rotates using the direction sensor, the angle of the working unit 40 can be adjusted by operating the separate cylinder 88 so as to face a certain direction. Moreover, the valve 56, the 1st switching valve 62, and the 2nd switching valve 63 can be installed in the mounting part 85 as the hydraulic valve 17 of FIG. 8, for example.

  FIG. 9 is a plan view showing an example when the trouser is mounted on the tractor of the wrinkle coater according to the third embodiment of the present invention. In the figure, it can be seen that when the cylinder 15 extends, the working unit 40 moves from the position of the two-dot chain line to the position of the solid line. When the hydraulic circuit in the cylinder 15 is in the state shown in FIG. 2, the cylinder 15 is biased toward the extending side, so that the working unit 40 is always biased toward the heel side. On the other hand, when the working unit 40 receives a certain force from the heel side by operating the tractor, the force is transmitted to the cylinder 15 and the pressure in the cylinder chamber 51 is increased. However, the pressure is reduced and no more than a certain force is applied to the bag.

  Further, when the first switching valve 62 is switched as shown in FIG. 3, a strong pressure is applied to the first cylinder chamber 51 by the pressure from the pump 58, and the rod 54 is not decompressed by the valve 56. The cylinder 15 is extended by moving in the extending direction (left side in FIG. 3). As a result, the working unit 40 does not follow the base rod 1 and can be pushed toward the rod side with a strong force. As an example of this, there is a case where the cocoon is desired to be formed in a form in which the cocoon is pushed in more than the original cocoon. Further, at the start of the glazing operation, etc., there is often a strong reaction force toward the reaction side of the working part. In this case as well, the operation is performed with a circuit in which the first switching valve 62 is switched as shown in FIG. It is also effective. Further, by controlling the first switching valve 62, for example, at the beginning of the haze coating operation, the work unit 40 is strongly pressed against the heel side (state of FIG. 3), and after a few seconds, the work unit 40 is returned to the original position. It is possible to follow the heel (state of FIG. 2).

  FIG. 10 shows an example of the smearing operation of the smearing machine according to the third embodiment of the present invention. Actually, the wrinkle coater is attached to the tractor, but the tractor is omitted in the figure for the sake of explanation. When the state of the hydraulic circuit of the cylinder 15 is the state of FIG. 2, in FIG. 10, when the lacquer moves from (a) to (b) by the operation of the tractor, The part 40 receives the reaction force from the flange 1 and the cylinder 15 is acted on in a contracting direction. As a result, the pressure in the first cylinder chamber 51 is increased, and when the pressure exceeds the set constant pressure, the pressure is reduced by the valve 56. Then, the cylinder 15 can be formed into a straight ridge without the shrinking working unit 40 moving in the lateral direction of the tractor and pressing the heel too much. On the other hand, when the lacquer is moved from (b) to (c) by the operation of the tractor and the tractor is separated from the ridge 1, the working unit 40 causes the cylinder 15 to It is possible to follow without stretching and leaving the fountain 1. Further, if the first switching valve 62 is switched to bring the hydraulic circuit of the cylinder 15 into the state shown in FIG. 3, the working unit 40 does not follow the main rod 1 but presses it with a strong force to form the rod. It becomes possible. The tracking of the working unit 40 with respect to the movement of the tractor is the same as in the first and second embodiments.

  FIG. 11: is a top view which shows an example at the time of moving the working part of the coating machine of Example 3 of this invention to a non-working position. In FIG. 11, the solid line is the position when the working unit 40 is working, and the two-dot chain line is the position when the working unit 40 is moved to the non-working position. Here, when the working unit 40 is at the position of the solid line, the second switching valve 63 is switched from the state of FIGS. 2 and 3 so that the pressure from the pump 58 is transmitted to the second cylinder chamber 52. Shrinks and moves to the position of the two-dot chain line. Thus, the tractor 2 can be safely moved when not working. At this time, the separate cylinder 88 can be operated so as to be at an appropriate angle when the working unit 40 is in a non-working state, together with the operation of the cylinder 15. On the other hand, when moving the working unit 40 from the position of the two-dot chain line in FIG. 5 to the position of the solid line, if the second switching valve 63 is switched to the state of FIG. Is possible. At this time, when the first switching valve 62 is in the state of FIG. 3, there is no pressure reduction by the valve 56, and therefore, the first switching valve 62 can be moved faster than the state of FIG. 2.

  2 and 3, a cylinder having a structure in which the rod 54 of the piston 53 is attached in the right direction instead of the left direction in the figure can be applied. In this case, pressure reduction by the valve 56 (in the case of the state of the circuit in FIG. 2) acts when a force is applied to the rod 54 on the extending side. In this case, for example, the cylinder can be attached so as to connect the fulcrum J provided in the mounting portion 85 and the fulcrum K provided in the intermediate frame 83 in FIG. That is, even when the pressure reducing valve acts when a force is applied to the rod 54 on the extending side, the present invention can be realized if the working unit 40 is mounted so as to move toward the flange 1 when the cylinder contracts. .

  As described above, according to the present invention shown in the first to third embodiments, the simple cylinder 15 using the valve is used, so that the working unit 40 can be applied to the marshal regardless of the driving operation and skill of the operator. It is possible to select whether or not to work while following.

  Examples 1 to 3 are examples of a brush coater, but the present invention has a mounting portion and a working portion regardless of the brush coater, and these are at least during the work of the working portion. Any offset working machine can be applied as long as the working unit is connected by a link mechanism that can move in a direction in which the working unit moves toward and away from the work surface. For example, in the case of a mower, the valve 56 shown in the first to third embodiments operates when the working unit (roller or the like) is pressed against the reed when working on the reed. It can be applied so that the working part of the mower is operated following the reed by the same mechanism as the reed coating machine in the circuit. In addition to this, for example, in the case of a trench excavator, even when performing trench excavation work or when pressing against the side surface of the old trench, in the circuit on which the valve 56 acts as shown in the first to third embodiments. It can be applied so that the working part of the ditching machine follows the side of the old groove with the same mechanism as the mechanism that follows the wrinkle coater. In these examples as well, the mechanism that the working part does not follow can be obtained by switching the first switching valve 62, and the working part can be moved to the non-working position by switching the second switching valve. Can do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an embodiment of a glazing machine according to a first embodiment of the present invention. It is a hydraulic circuit diagram which shows one form of the cylinder in this invention. FIG. 3 is a hydraulic circuit diagram when the first switching valve 62 is switched in FIG. 2. It is a top view which shows an example at the time of mounting | wearing with the tractor of the coating machine of Example 1 of this invention. It is a top view which shows an example at the time of moving the working part of the coating machine of Example 1 of this invention to a non-working position. It is a top view which shows an example at the time of mounting | wearing with the tractor of the coating machine of Example 2 of this invention. It is a top view which shows an example at the time of moving the working part of the coating machine of Example 2 of this invention to a non-working position. It is a top view which shows one form of the surface coating machine of Example 3 of this invention. It is a top view which shows an example at the time of mounting | wearing with the tractor of the coating machine of Example 3 of this invention. An example at the time of the smearing operation | work of the smearing machine of Example 3 of this invention is shown. It is a top view which shows an example at the time of moving the working part of the coating machine of Example 3 of this invention to a non-working position.

Explanation of symbols

1 畦 2 Tractor 11 mounting part (Example 1)
12-14 Attaching part 15 Cylinder 16 1st fulcrum 17 Hydraulic valve 18 2nd fulcrum 21 1st arm 22 2nd arm 23 Joint 31 3rd fulcrum 32 4th fulcrum 35 Tillage nail 36 Pretreatment part 37 Casket forming section 40 Working section 51 First cylinder chamber 52 Second cylinder chamber 53 Piston 54 Rod 55 First flow path 56 Valve 57 Second flow path 58 Pump 59 Tank 60 Third flow path 61 Fourth flow path Flow path 62 1st switching valve 63 2nd switching valve 64 5th flow path 65 Bypass circuit 71 1st arm 72 2nd arm 73 1st fulcrum 74 2nd fulcrum 75 3rd fulcrum 76 4th fulcrum 77 Mounting part (Example 2)
82 Mounting part side fulcrum 83 Intermediate frame 84 Working part side fulcrum 85 Mounting part (Example 3)
86 First fulcrum 87 Second fulcrum 88 Separate cylinders A to H, J, K

Claims (6)

A mounting portion that is mounted on a rear portion of the traveling machine body and that is mounted on the traveling machine body; and a working unit that performs work by power from the traveling machine body, wherein the mounting unit and the working unit are at least work of the working unit. In the offset working machine that is connected by a link mechanism that allows the working unit to move in the direction of contacting and separating from the work surface at the time,
In the link mechanism, a hydraulic cylinder, which is divided by a piston and in which the pressure in one cylinder chamber is set higher than the pressure in the other cylinder chamber, is urged toward the work surface side. Wearing,
In the hydraulic circuit of the hydraulic cylinder, a valve for reducing pressure when the pressure of the cylinder chamber on which the pressure is set higher than a certain pressure, and a bypass circuit bypassing the valve for reducing the pressure, An offset working machine comprising: a switching valve for determining whether to pass through the valve or the bypass circuit. A mounting portion that is mounted on a rear portion of the traveling machine body and that is mounted on the traveling machine body; and a working unit that performs work by power from the traveling machine body, wherein the mounting unit and the working unit are at least work of the working unit. In the offset working machine that is connected by a link mechanism that allows the working unit to move in the direction of contacting and separating from the work surface at the time,
The link mechanism includes a hydraulic cylinder capable of switching which one of the two cylinder chambers divided by the piston is set to a high pressure, and the working unit is connected to the link mechanism by expansion and contraction of the hydraulic cylinder. So that it can be moved by
In the hydraulic circuit of the hydraulic cylinder, in order to reduce the pressure when the pressure in the cylinder chamber whose pressure is set high so that the working part is biased toward the work surface side becomes equal to or higher than a certain pressure. An offset working machine, comprising: a bypass valve that bypasses the valve for depressurizing, and a switching valve that determines whether the valve passes through the bypass circuit or the bypass circuit.   3. The offset working machine according to claim 1, wherein the switching valve can be switched manually or electrically.   The offset working machine according to any one of claims 1 to 3, wherein the link mechanism is a pseudo-parallel link mechanism or a parallel link mechanism. 4. The offset working machine according to claim 1, wherein the link mechanism includes an intermediate frame that connects the mounting portion and the working portion, and the intermediate frame is connected to the mounting portion. A mounting part side fulcrum that can be rotated in the horizontal direction provided on the working part side fulcrum that is provided on the working part side and that can be rotated in the horizontal direction.
The offset working machine, wherein the hydraulic cylinder is attached to the attachment portion and the intermediate frame so as to connect respective fulcrums provided separately from the attachment portion side fulcrum.   The offset working machine according to any one of claims 1 to 5, wherein the constant pressure in the valve for reducing the pressure equal to or higher than the constant pressure is adjustable by an adjusting member provided on the valve. An offset work machine characterized by

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