JP5956300B2 - Tillage work machine - Google Patents

Description

  According to the present invention, the upper part of the work rotor rotatably supported by the work machine body is covered by a shield cover, and an apron is provided at the rear end of the shield cover so as to be rotatable in the vertical direction. The present invention relates to a tillage work machine provided.

  Such a tilling work machine, while scraping off the soil attached to the inner part of the apron and the work rotor, or when changing the tillage claw provided on the work rotor, It is common for soil to be scraped off and tilled nails replaced.

  However, since the apron is heavy, the work of jumping up the apron is heavy labor for the worker. Therefore, there is also a proposal for automating the apron lifting operation using an electric cylinder as a drive source, but the cost is high and it has not been put into practical use.

  In view of this, there has been proposed an apron flip-up assist device that assists the spring-up force using the elastic force of the gas spring when the apron is manually flipped up (see Patent Document 1). The apron flip-up assist device described in Patent Document 1 includes a gas spring provided between a side cover provided at a width direction end of a work machine body of a rotary work machine and a width direction end of the apron. The rod-side end of the gas spring is supported so as to be movable in the vertical direction along a guide hole provided in the side cover.

  When the apron is flipped up, this apron spring-up assist device moves the apron of the gas spring so that the end of the rod side of the gas spring moves to the lower part of the guide hole and the gas spring is oriented obliquely upward. Assist.

JP 2008-278757 A

  This conventional apron flip-up assist device is configured to push up the apron by applying the biasing force of the gas spring from the abdominal surface side to the back surface side of the apron, and is provided at the end portion in the width direction of the apron. . For this reason, there is a possibility that the gas spring may come into contact with an obstacle such as a bag or a side wall and be damaged during the operation.

  The present invention has been made in order to solve such problems, and there is no possibility that the gas spring will come into contact with an obstacle during operation, and the apron spring having a large degree of freedom in the mounting position of the gas spring. An object of the present invention is to provide a tilling machine equipped with a lifting assist mechanism.

  In order to achieve the above object, a tilling work machine according to the present invention has a work cover (cultivation rotor 20 in the embodiment) supported rotatably on the work machine main body covered with a shield cover, and the rear of the shield cover. A tilling work machine in which an apron is provided at the end so as to be rotatable in the vertical direction, and the front side is movable in the front-rear direction on a support member (support plate 43 in the embodiment) provided above the shield cover. A gas spring that is supported and whose rear side is pivotably connected to the upper side of the shield cover, and whose front side is supported by the support member so as to be movable in the front-rear direction together with the front side of the gas spring, and whose apron is provided on the upper surface of the apron A link arm member rotatably connected to the side connection portion (the bracket seat 26 in the embodiment) is provided (claim 1).

  Further, between the rear side of the link arm member of the present invention and the apron side connecting portion, the front side is rotatably supported by a fulcrum shaft portion provided above the shield cover, and the rear side is provided on the upper surface of the apron. In addition, a link member (link plate 41 in the embodiment) that is rotatably connected to the apron side connecting portion and is rotatable in the front-rear direction around the fulcrum shaft portion is interposed (claim). 2).

  Further, the support member of the present invention is provided with a lock device for restricting the extension of the gas spring in the extension direction (claim 3).

  Further, the rear side of the link arm member and the apron side connecting portion of the present invention are pivotally connected via a shaft portion (the connecting shaft portion 28 in the embodiment) or the link member, and the rear side of the link arm member, Either of the apron side connection part and the link member includes a movement allowance part (a length in the embodiment) that allows the shaft part or the link member to move back and forth when the apron rotates up and down with respect to the shield cover during normal tillage work. A hole (26a, 41b, 60a) is provided (Claim 4).

  In addition, the apron side connecting portion of the present invention is a rod support member provided on the apron for supporting a compression rod that is provided between the work implement main body and the apron and can adjust the working pressure of the apron (the embodiment). Bracket seat 26). (Claim 5)

  According to the agricultural machine according to the present invention, the above features make it possible to prevent the gas spring from touching and damaging the obstacle during the operation, and the apron raising assist with a large degree of freedom in the mounting position of the gas spring. An object of the present invention is to provide a tillage working machine including a mechanism.

1 is a partial perspective view of a tilling work machine provided with an apron raising assist mechanism according to a first embodiment of the present invention. FIG. The apron raising assist mechanism of the tilling work machine concerning a 1st embodiment of the present invention is shown, the figure (a) is a top view of the apron raising auxiliary mechanism, and the figure (b) shows the apron raising auxiliary mechanism. It is a side view of a tillage working machine provided. The side view of a tilling work machine provided with the apron flipping-up assist mechanism in which the lock by the lock device was released when the apron of the tilling work machine is in the working position is shown. The side view of the tillage working machine showing a mode that the locking device begins to shift to the lock standby state at a position where the apron is flipped up using the unlocked apron lifting assist mechanism is shown. The side view of the tillage working machine showing a mode that the process of flipping up the apron using the unlocked apron lifting assist mechanism is completed and the lock device is shifted to the lock standby state is shown. The side view of the tilling work machine showing the mode of the halfway position which pushes down an apron until it becomes a locked state is shown, maintaining the lock waiting state of the apron raising auxiliary mechanism. The side view of a tilling work machine when an apron is flipped up with the apron flipping-up assist mechanism in a locked state is shown. The side view of the tillage working machine provided with the other apron raising assistance mechanism concerning 1st Embodiment of this invention is shown. The side view of a tillage working machine provided with the apron raising assistance mechanism concerning a 2nd embodiment of the present invention is shown. The side view of the tillage working machine provided with the other apron raising assistance mechanism concerning 2nd Embodiment of this invention is shown.

  Hereinafter, a preferred embodiment of a tilling work machine provided with an apron raising assist mechanism of the present invention will be described with reference to FIGS. 1 to 10. In addition, this embodiment demonstrates as an example the tilling work machine for tilling and crushed soil as an example of a tilling work machine.

[First embodiment]
As shown in FIG. 1 (partial perspective view), the tillage work machine 1 includes a work machine main body 10. The work machine body 10 is attached to the rear part of the traveling machine body so that the front part of the body frame 11 extending in the left-right direction is connected to a three-point link coupling mechanism provided at the rear part of the traveling machine body (not shown). A gear box 14 having an input shaft (not shown) through which power from the traveling machine body is transmitted from the PTO shaft of the traveling machine body via a power transmission means such as a universal joint is provided at the center of the main body frame 11. .

  The main body frame 11 has a main frame 16 extending from the gear box 14 to both sides in the width direction, and a chain transmission case (not shown) is suspended from the end of the left main frame 16 in the forward direction of the traveling machine body, A side frame (not shown) is suspended from the end portion of the right main frame 16 so as to face the chain transmission case. A transmission mechanism is provided in the left main frame 16 and the chain transmission case, and a tilling rotor 20 provided with a number of tilling claws 21 shown in FIG. 2 (b) between the chain transmission case and the lower end of the side frame. Is mounted rotatably. The power transmitted to the input shaft is transmitted to the main frame 16 and the transmission mechanism in the chain transmission case via the gear box 14 to rotate the tilling rotor 20 (see FIG. 2B) in a predetermined direction. .

  The upper side of the tilling rotor 20 shown in FIG. 2B is covered with a shield cover 22, and side covers (not shown) are provided at both ends in the width direction on the rear side of the shield cover 22. That is, the work machine main body 10 includes a main body frame 11, a gear box 14, a chain transmission case, a side frame, a tilling rotor 20 (see FIG. 2B), a shield cover 22, a side cover, and the like. ing.

  A front end portion of the apron 25 is pivotally supported on the rear end portion of the shield cover 22 via a shaft 23 shown in FIG. The apron 25 extends rearward, and the tip of the apron 25 contacts the ground to level the cultivated soil surface. A compression rod 30 is provided between the upper surface of the apron 25 and the main frame 16, and a compression spring 31 is wound around the apron 25 to adjust the working pressure of the apron 25.

  A plurality of compression rods 30 are provided with a predetermined interval in the width direction of the apron 25. The front end of the compression rod 30 is pivotally supported by the main frame 16 so as to be pivotable up and down, and the rear side of the compression rod 30 is fitted into a bracket 27 pivotally supported by a bracket seat 26 provided on the upper surface of the apron. Has been.

  On the front side of the shield cover 22, a pair of grounding wheels (not shown) that travels in contact with the field while keeping the working depth of the tilling rotor 20 during work in accordance with the rear wheel width of the traveling machine body is provided. Above the shield cover 22 and the apron 25, there is provided an apron raising assist mechanism 40 that can easily raise the apron 25 when an operator performs the operation of raising the apron 25.

  Next, the apron raising assist mechanism 40 will be described with reference to FIGS. 1, 2 (a), and 2 (b). As shown in FIGS. 1 and 2B, the apron flip-up assist mechanism 40 is rotatably supported on a fulcrum shaft portion 44 provided above the shield cover 22 on the front side, and the apron 25 on the rear side. A link plate 41 that extends and is pivotably connected to the top of the apron 25 and pivots up and down around the fulcrum shaft 44, and a support plate 43 provided on the upper surface of the shield cover 22 on the front side. A gas spring 50 (see FIGS. 2A and 2B) whose rear side is rotatably connected coaxially with the fulcrum shaft portion 44 of the link plate 41, and the front side is supported. A link arm member 60 is supported on the plate 43 so as to be movable together with the front side of the gas spring 50, and the rear side is rotatably connected to the link plate 41.

  The link plate 41 has a protruding portion 41a that extends in the front-rear direction and protrudes upward, and is formed in a substantially triangular shape in a side view. The front side of the link plate 41 is rotatably connected to a fulcrum shaft portion 44 provided on the rear side of the support plate 43. A pair of support plates 43 extend in the front-rear direction on the upper surface of the shield cover 22 and are arranged in parallel with a predetermined interval in the shield cover width direction. The pair of support plates 43 extends from the front end portion of the shield cover 22 to the rear end portion. The fulcrum shaft portion 44 described above is attached between the rear end portions of the pair of support plates 43, and the front end portion of the link plate 41 is rotatably supported at the central portion of the fulcrum shaft portion 44 in the axial direction. The plate 41 rotates in the vertical direction between the pair of support plates 43 with the fulcrum shaft portion 44 as a rotation fulcrum. For this reason, there is no possibility that the link plate 41 contacts the support plate 43 when the link plate 41 rotates. In addition, the bottom side end of the gas spring 50 is rotatably connected to an intermediate portion in the axial direction of the fulcrum shaft portion 44, and the gas spring 50 is disposed between the pair of support plates 43.

  A long hole 41 b extending in the front-rear direction is formed on the rear side of the link plate 41. A connecting shaft portion 28 that protrudes from the side surface of the bracket seat 26 is inserted into the long hole 41b. The link plate 41 and the apron 25 are connected to each other via the connecting shaft portion 28. As will be described in detail later, the upward movement of the apron 25 can be assisted by turning the link plate 41 upward.

  The long hole 41b is provided in the front-rear direction in order to prevent the movement of the connecting shaft portion 28 from being restricted when the link plate 41 is rotated due to the difference between the rotating direction of the link plate 41 and the moving direction of the connecting shaft portion 28. It has an extended shape. The rear side of the long hole 41b extends obliquely downward to enlarge the range of rotation of the apron 25 further downward. The connecting shaft portion 28 is a connecting portion between the front side extending in the front-rear direction of the long hole 41b and the rear side extending obliquely downward at the work position Ps (see FIG. 2B) in a posture in which the apron 25 extends downward. In the state where the apron 25 is flipped up at the bent portion 41b1 (see FIG. 2B), it is located at the front end of the long hole 41b (see FIG. 5). The bent portion 41b1 of the long hole 41b is curved with a predetermined radius of curvature, and even if the apron 25 is moved to the working position Ps and rotated at a relatively small angle in the vertical direction, The connecting shaft portion 28 moves in front of and behind the bent portion 41b1 to allow the apron 25 to rotate.

  As shown in FIG. 2A, a shaft portion 45 extending in a direction orthogonal to the link plate 41 is inserted into the upper portion of the protruding portion 41 a of the link plate 41. The shaft portion 45 protrudes with substantially the same length on both sides of the link plate 41 with the link plate 41 at the center. The rear end portions of the link arm member 60 are rotatably connected to both end portions of the shaft portion 45. That is, a pair of link arm members 60 are connected to both end portions of the shaft portion 45.

  The link arm member 60 extends along the support plate 43 with a gap with respect to the inner surfaces of the pair of support plates 43. On the rear side of the link arm member 60, as shown in FIG. 2B, a long hole 60a capable of movably supporting the shaft portion 45 provided on the protruding portion 41a of the link plate 41 is provided. When assisting the upward jumping of the apron 25, the link arm member 60 moves forward with the shaft portion 45 in contact with the rearmost end portion of the long hole 60, and accordingly the shaft portion 45 also moves forward. The link plate 41 is rotated forward with the fulcrum shaft portion 44 being stopped.

  As shown in FIG. 2A, the front end of the link arm member 60 is rotatably connected to the axial end of the movable shaft 46 provided between the front sides of the pair of support plates 43. . A rod side end 50a of the gas spring 50 is rotatably connected to an intermediate portion in the axial direction of the movable shaft portion 46. As shown in FIG. 2B, the movable shaft portion 46 is supported so as to be movable along a long hole 43 a provided on each front side of the pair of support plates 43. The long hole 43a extends in a direction inclined downward as it advances to the front side, and guides the movement of the movable shaft portion 46 and the pair of link arm members 60 connected thereto in the front-rear direction according to the expansion and contraction of the gas spring 50.

  The gas spring 50 is connected between a fulcrum shaft portion 44 provided on the rear side of the pair of support plates 43 and a movable shaft portion 46 provided on the front side of the pair of support plates 43 and a pair of link arms. Arranged between the members 60. The gas spring 50 is configured so that an elastic force is always generated in the extending direction. In the gas spring 50, the rod side end 50a is positioned on the rear end side of the long hole 43a in a substantially fully contracted state, and the rod side end 50a is positioned on the front end side of the long hole 43a in a substantially fully extended state. It is configured in a large size. On the front side of the pair of support plates 43, a lock device 70 is provided that can regulate the expansion of the gas spring 50 with the gas spring 50 being substantially fully contracted.

  Next, the locking device 70 will be described with reference to FIGS. 2 (a), 2 (b), and 3. FIG. As shown in FIGS. 2A and 2B, the lock device 70 is a lock that can be rotated in the vertical direction with a shaft portion 71 attached between the front end portions of the pair of support plates 43 as a rotation fulcrum. A plate 73 and an operation handle 76 for rotating the lock plate 73 are provided. The operation handle 76 has one end connected to the lock plate 73 and the other end extending toward the apron 25 along the outer side surface of the support plate 43.

  The lock plate 73 is formed in a rectangular shape in plan view, and is disposed on the upper portion between the front end portions of the pair of support plates 43. A shaft portion 71 that rotatably supports the lock plate 73 is provided between the upper portions of the front end portions of the pair of support plates 43. A pair of contact plates 73 a bent downward are formed on both sides of the lock plate 73 in the width direction.

  When each of the rear end portions of the pair of contact plates 73a is in a posture along the upper surface of the pair of support plates 43 (hereinafter referred to as a lock posture) when the gas spring 50 is in a substantially fully contracted state, It moves to a position facing the front end of the corresponding link arm member 60. For this reason, when the lock plate 73 is in the locked position when the gas spring 50 is in a substantially fully contracted state, the front end portion of the link arm member 60 comes into contact with the rear end portion of the contact plate 73a and the gas spring 50 is extended. Can be locked.

  The operation handle 76 includes a rotation connecting member 76a (see FIG. 2A) fixed to the lock plate 73, and an arm member 76b connected to an end of the rotation connecting member 76a. The rotation connecting member 76a is a rod-like member, and is fixed to the upper surface of the lock plate 73 in a state extending in the lock plate width direction, one end portion of which protrudes to the outside of the support plate 43 on one side, and the other end portion on the other side. It protrudes to the outside of the side support plate 43. A tension spring 79 is provided between the end of the rotation connecting member 76 a that protrudes to the outside of the one side support plate 43 and the one side support plate 43.

  The tension spring 79 is a rotation range of the lock plate 73 between a lock position where the gas spring 50 is locked by the lock plate 73 and a lock release position (see FIG. 3) where the gas spring 50 is unlocked. It is arrange | positioned so that it may extend most in the intermediate position. For this reason, when the lock plate 73 rotates to the lock position side from the position where the tension spring 79 extends most, the lock plate 73 is urged downward by the tension force of the tension spring 79 and the lock posture of the lock plate 73 is maintained. Further, when the lock plate 73 is rotated to the unlocking side from the position where the tension spring 79 is most extended, the lock plate 73 is urged upward by the tension force of the tension spring 79 and the lock plate 73 is opened. Retained.

  As shown in FIG. 2A, the arm member 76b has a front end pivotally supported by the other end of the rotation connecting member 76a and a rear side extending rearward along the support plate 43. The rear end portion of the arm member 76b is bent in a U shape to form a handle portion 76b1. The rear side of the arm member 76b is supported movably in the front-rear direction by an arm support member 81 attached to the support plate 43 and extending toward the arm member 76b.

  Next, referring to FIGS. 2A, 2B, 3, 4, and 5 for the operation of the apron raising assist mechanism 40 when the apron 25 moved to the work position Ps is operated to be raised. While explaining. When the apron 25 is moved to the working position Ps, as shown in FIGS. 2A and 2B, the gas spring 50 is substantially fully contracted and the rod side end 50a thereof is locked by the locking device 70. Locked by. Further, the link plate 41 extends in the front-rear direction, and the connecting shaft portion 28 inserted through the long hole 41b is located at a bent portion 41b1 of the long hole 41b. Further, the movable shaft portion 46 connected to the rod side end portion 50 a of the gas spring 50 is located on the rear end side of the long hole 43 a of the support plate 43.

  When the apron 25 is flipped up when the apron lifting assist mechanism 40 is in such a state, first, the operator performs an operation of gripping the handle portion 76b1 of the operation handle 76 of the locking device 70 and pulling it backward. Do. When the handle portion 76b1 is pulled rearward, the lock plate 73 rotates against the urging force of the tension spring 79 via the rotation connecting member 76a. Therefore, as shown in FIG. 3, the lock plate 73 is rotated upward, the rear end portion of the contact plate 73 a is disengaged from the front end portion of the link arm member 60, and the lock state of the gas spring 50 is released. .

  When the locked state of the gas spring 50 is released, the operator holds the apron 25 and pulls it upward. When the operator pulls up the apron 25, as shown in FIG. 4, the gas spring 50 extends, and the movable shaft portion 46 connected to the rod side end portion 50a moves to the front side of the long hole 43a of the support plate 43. To do. When the front end portion of the link arm member 60 comes into contact with the front end portion of the contact plate 73a (see FIG. 4), and when the operator pulls up the apron 25, the front end portion of the contact plate 73a becomes the link arm member. The lock plate 73 is pushed further forward by the front end portion 60, and eventually the lock plate 73 rotates downward with the shaft portion 71 as a fulcrum and is biased toward the lock position (lock standby state). The pulling is finished (see FIG. 5).

  At this time, the pair of link arm members 60 moves to the front side, and the link plate 41 rotates to the front side with the fulcrum shaft portion 44 as a rotation fulcrum. As a result, the elastic force of the gas spring 50 acts on the apron 25 via the connecting shaft portion 28 and the bracket seat 26 to urge the apron 25 to rotate upward. For this reason, the operator can flip up the apron 25 with a small force.

  Then, after the apron 25 is flipped up, when the apron 25 is returned to the normal work position (see FIG. 2B), the lock device 70 is already in the lock standby state. When pushed down, the lock plate 73 is spring-biased downward, and the front end portion of the link arm member 60 moves rearward while sliding on the lower surface of the contact plate 73a (see FIG. 6). As soon as the front end portion of the link arm member 60 is removed from the lower surface of the contact surface 73a, the lock plate 73 is locked (see FIG. 2B), and the apron 25 returns to a state where normal work can be performed.

  Since the apron raising assist mechanism 40 is disposed above the shield cover 22 and the apron 25, the apron raising assist mechanism 40 does not protrude outward in the width direction of the tilling work machine 1. For this reason, there is no possibility that the gas spring 50 may come into contact with an obstacle such as a bag or a side wall and be damaged during the operation. Further, the apron flip-up assist mechanism 40 can be installed at any place as long as it can be placed between the shield cover 22 and the apron 25. Therefore, the apron flip-up assisting device 40 has a high degree of freedom in arrangement with respect to the tilling work machine 1.

  As shown in FIG. 7, the apron flip-up assist mechanism 40 can flip up the apron 25 even if the apron 25 is locked with the gas spring 50 kept in a substantially fully contracted state. In this case, when the apron 25 is pivoted upward, the link plate 41 pivots forward about the fulcrum shaft 44, but the forward movement of the link arm member 60 is restricted by the lock device 70. The link arm member 60 cannot move to the front side.

  However, since the shaft portion 45 of the link plate 41 moves to the front side of the long hole 60a along the long hole 60a provided in the link arm member 60, the upward rotation of the apron 25 is allowed, and the apron 25 is moved. It can be flipped up and moved to the open position Pk. However, since the assistance by the elastic force of the gas spring 50 cannot be obtained when the apron 25 is flipped up, the burden on the operator when the apron 25 is flipped up becomes large.

  Thus, the apron 25 can be flipped up without using the apron flip-up assist mechanism 40 while maintaining the locked state of the locking device 70. In this case, the burden on the operator increases, but it becomes an effective means when the gas spring 50 is damaged and cannot be extended. Of course, the apron 25 is allowed to swing in the vertical direction in accordance with normal tillage work.

  In addition, the apron raising assist mechanism may be provided with at least two apron raising assist mechanisms 40 on both sides in the width direction of the apron 25 in a tilling work machine in which the compression rods 30 are provided on both sides in the width direction of the apron 25. .

  In the above-described embodiment, the bottom end portion of the gas spring 50 is pivotally connected to the fulcrum shaft portion 44 provided on the rear side of the pair of support plates 43, but FIG. As shown in the side view, the bottom side end of the gas spring 50 may be rotatably connected to a shaft portion 47 provided between a pair of support plates 43 in front of the fulcrum shaft portion 44.

  In this way, it is possible to use a small gas spring 50 'having a relatively short stroke. Therefore, a gas spring corresponding to a tilling machine having a different size can be used by being attached to the apron raising assist mechanism 40 instead of the gas spring 50 described above, and the versatility of the apron raising assist mechanism 40 is improved. Can do.

  Further, the connection destination of the bottom end portion of the gas spring 50 is not limited to the above, and may be connected to the main frame 16 so as to be rotatable, for example.

  If it does in this way, the freedom degree of the installation place of the apron flipping-up auxiliary mechanism 40 can be raised more.

[Second Embodiment]
Next, a second embodiment of a wrinkle coater provided with another apron flip-up assist mechanism will be described with reference to FIGS. 9 and 10. In the second embodiment, only differences from the first embodiment described above will be described, and the same reference numerals will be given to the same aspects as those in the first embodiment, and the description thereof will be omitted.

  As shown in FIG. 9, the apron raising auxiliary device 40 of the tillage work machine 1 is connected to the rear end side of the link arm member 60 so as to be movable in the front-rear direction with respect to the connecting shaft portion 28 provided on the bracket seat 26. ing. In the link arm member 60, the connecting shaft portion 28 is inserted into a long hole 60a provided on the rear end side of the link arm member 60. When the apron 25 in the normal operation swings in the vertical direction, the connecting shaft portion 28 is inserted into the long hole 60a. To move.

  The long hole 60a extends so that the connecting shaft portion 28 is positioned at the rear end portion of the long hole 60a in a side view in a state where the apron 25 swings downward in the normal operation. When the long hole 60a is provided in the link arm member 60 in this way, after the lock device 70 is released from the locked state, when the operator attempts to lift the apron 25 that swings downward in the normal operation, The spring 50 extends, the link arm member 60 moves to the front side, and the connecting shaft portion 28 that is in contact with the rear end portion of the long hole 60a urges the apron 25 upward, so that the operator can flip up the apron. Can assist.

  Moreover, the link plate 41 (refer FIG.2 (b)) mentioned above can be eliminated by connecting the rear-end side of the link arm member 60 to the bracket seat 26 so that rotation is possible. For this reason, the number of parts of the apron raising assist mechanism 40 can be reduced, and the manufacturing cost of the apron raising assist mechanism 40 and the tilling work machine 1 on which the apron raising assist mechanism 40 is mounted can be reduced.

  Further, as shown in FIG. 10, in the connection between the rear end side of the link arm member 60 and the bracket seat 26 ', a connecting shaft portion 28 is provided on the rear end side of the link arm member 60 and connected to the bracket seat 26' side. You may provide the long hole 26a which connects the axial part 28 movably. The long hole 26a extends substantially linearly obliquely upward in a side view in a state where the apron 25 swings most downward during normal operation, and extends so that the connecting shaft portion 28 is positioned on the upper end side of the long hole 26a. . The bracket seat 26 'extends vertically and in the front-rear direction along the direction in which the long hole 26a extends.

  When the long hole 26a is provided in the bracket seat 26 'in this way, after the lock state of the locking device 70 is released, the operator performs an operation of flipping up the apron 25 that swings downward in the normal operation. The spring 50 extends, the link arm member 60 moves to the front side, and the connecting shaft portion 28 that is in contact with the front end portion of the long hole 26a urges the apron 25 upward, so that the operator can flip up the apron. Can assist.

  Further, the link plate 41 (see FIG. 2B) can be eliminated by connecting the rear end side of the link arm member 60 to the bracket seat 26 'so as to be rotatable. The number of parts can be reduced, and the production cost of the apron raising assist mechanism 40 and the tilling work machine 1 on which the apron raising assist mechanism 40 is mounted can be reduced.

  In the above-described embodiment, the case where the gas spring 50 is supported by the pair of support plates 43 provided on the upper surface of the shield cover 22 is shown, but the main frame 16 disposed above the shield cover 22 is provided. A pair of support plates may be attached, and the gas spring 50 may be attached to the pair of support plates.

1 Tillage work machine (rotary work machine)
10 working machine body 20 tillage rotor (working rotor)
22 Shield cover 25 Apron 26 Bracket seat (apron side connection part, rod support member)
26a, 41b, 60a long hole (movement allowance)
28 Connecting shaft (shaft)
41 Link plate (link member)
43 Support plate (support member)
44 fulcrum shaft 50 gas spring 60 link arm member 70 locking device

Claims (5)

A tilling work machine in which an upper part of a work rotor rotatably supported by the work machine body is covered with a shield cover, and an apron is provided at the rear end of the shield cover so as to be rotatable in the vertical direction,
A gas spring whose front side is supported by a support member provided above the shield cover so as to be movable in the front-rear direction, and whose rear side is rotatably connected above the shield cover;
A link arm member whose front side is supported by the support member so as to be movable in the front-rear direction together with the front side of the gas spring, and whose rear side is rotatably connected to an apron side connecting portion provided on the upper surface of the apron. Tillage work machine characterized by. Between the rear side of the link arm member and the apron side connection portion, the front side is rotatably supported by a fulcrum shaft portion provided above the shield cover, and the rear side is provided on the upper surface of the apron. The tilling work machine according to claim 1, further comprising a link member that is rotatably connected to the apron side connecting portion and is rotatable in the front-rear direction around the fulcrum shaft portion. The tilling work machine according to claim 1 or 2, wherein the support member is provided with a lock device that regulates extension of the gas spring in the extension direction. The rear side of the link arm member and the apron side connection part are connected to each other via a shaft part or a link member so as to be freely rotatable.
Any one of the rear side of the link arm member, the apron side connection portion, and the link member may include the shaft portion or the link member associated with the apron rotating up and down with respect to the shield cover during normal tillage work. The tilling work machine according to any one of claims 1 to 3, further comprising a movement allowing portion that allows back and forth movement. The apron side connecting portion is a rod support member provided in the apron for supporting a compression rod provided between the work implement main body and the apron and capable of adjusting the working pressure of the apron. The tillage work machine according to any one of claims 1 to 4, wherein

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