JP6000815B2 - Apron flip-up assist mechanism and tillage work machine equipped with the same - Google Patents

Description

  The present invention is attached to a tilling work machine in which an upper part of a work rotor rotatably supported by a 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. The present invention relates to an apron flip-up assist mechanism and a tillage work machine to which the apron is flipped up.

  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 mechanism 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 mechanism described in Patent Document 1 includes a gas spring provided between a side cover provided at the width direction end of the work machine body of the rotary work machine and the 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, the apron springing up mechanism moves the rod end of the gas spring to the lower part of the guide hole, and the gas spring is tilted upward so that the apron jumps up. Assist.

JP 2008-278757 A

  This conventional apron flip-up assist mechanism is configured to push up the apron by applying the urging 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 to solve such a problem, and there is no risk that the gas spring or the like will be damaged by contact with an obstacle during the work, and the degree of freedom of the mounting position of the gas spring or the like is great. An object of the present invention is to provide an apron flip-up assist mechanism and a tilling work machine including the apron flip-up assist mechanism.

  In order to achieve the above object, the apron flip-up assist mechanism of the present invention rotates in the vertical direction on the rear end of the shield cover that covers the top of the work rotor (the tillage rotor 20 in the embodiment) provided in the tillage working machine. An apron flip-up assisting mechanism that assists in flipping up the apron that is movably provided, and is provided above the shield cover and extends in the front-rear direction, and the front side supports the support member. The gas spring is supported by the member so as to be movable in the front-rear direction, the rear side is pivotally connected to the upper side of the shield cover, and the 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. A link arm member extending rearward along the gas spring, an upper side is rotatably connected to a rear side of the link arm member, and a lower side is connected to the apron. And a apron side connection member that is movably connected, characterized in that it is detachably attached to the tilling machine (claim 1).

  In addition, a link member (in the embodiment) that is rotatable between the rear side of the link arm member of the present invention and the apron side connecting member about the fulcrum shaft provided above the shield cover in the front-rear direction. A link plate 70) 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).

  In addition, the apron side connecting member of the present invention can be adjusted in length (claim 4).

  Further, the present invention provides 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 portion of the shield cover so as to be rotatable in the vertical direction. A gas spring having a front side supported by a support member provided above the shield cover so as to be movable in the front-rear direction and a rear side rotatably connected to the top of the shield cover; A link arm member that is supported so as to be movable in the front-rear direction together with the front side of the spring, and whose rear side is pivotally connected to an apron side connection member provided on the upper surface of the apron and extends rearward along the gas spring. An apron raising assist mechanism is provided, and the apron raising assist mechanism is detachably attached to the tilling work machine (claim 5).

  In addition, a link that can be rotated in the front-rear direction about a fulcrum shaft provided above the shield cover between the rear side of the link arm member and the apron side connecting member of the apron raising assist mechanism of the present invention. A member is interposed (claim 6).

  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 7).

  Further, the apron side connecting member of the present invention can be adjusted in length (claim 8).

  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 is to provide a mechanism and a tillage working machine including the mechanism.

The partial perspective view of the tillage working machine provided with the apron raising auxiliary mechanism concerning one embodiment of the present invention is shown. The apron raising auxiliary mechanism provided in the tilling work machine concerning one embodiment of the present invention is shown, the figure (a) is a top view of the apron raising auxiliary mechanism, and the figure (b) is the apron raising auxiliary mechanism. It is a side view of a tillage working machine provided with an auxiliary mechanism. 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.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an apron flip-up assist mechanism of the present invention and a tillage working machine including the same will be described with reference to FIGS. 1 to 7. In the present embodiment, an example of a tilling work machine for plowing and crushed soil will be described as an example of a tilling work machine. For convenience of explanation, the directions of the arrows shown in FIG. 1 will be described below as the front-rear direction and the left-right direction.

  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 body frame 11 in the left-right direction. Yes.

  The main body frame 11 has a main frame 16 that extends from the gear box 14 to both sides in the left-right 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 provided with a plurality of tilling claws 21 shown in FIG. 2 (b) between the chain transmission case and the lower end of the side frame. 20 is rotatably attached. 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 (see FIG. 2B) is covered with a shield cover 22, and side covers (not shown) are provided at both ends in the left-right 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 (left-right 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 unillustrated travels in contact with the farm field while keeping the working depth of the tilling rotor 20 (see FIG. 2B) constant during work according to the rear wheel width of the traveling machine body. A grounding wheel is provided. Above the shield cover 22 and the apron 25, there is provided an apron raising assist mechanism 40 that energizes the apron 25 so that the apron 25 can be easily raised when the operator performs the raising operation of 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 connected to the shield cover 22 and the main frame 16 and extends in the front-rear direction, and the front side extends in the front-rear direction to the support plate 41. A gas spring 50 (see FIG. 2B) that is supported movably and whose rear side is pivotally connected to the rear side of the support plate 41, and the front side of the support plate 41 along the front side of the gas spring 50 in the front-rear direction. A link arm member 60 that is movably supported and whose rear side extends rearward along the gas spring 50 and a front side that is pivotally supported by a fulcrum shaft portion 45 provided on the rear side of the support plate 41 and a link. A link plate 70 that is pivotally connected to the rear side of the arm member 60 and pivotable in the front-rear direction about the fulcrum shaft portion 45, and an upper end portion is pivotally connected to the rear side of the link plate 70. , The lower end is and a apron side connecting member 75 connected pivotally to the apron 25.

  A pair of support plates 41 extends in the front-rear direction on the upper surface of the shield cover 22 and is provided in parallel with a predetermined interval in the shield cover width direction (left-right direction). The pair of support plates 41 are disposed between the main frame 16 and the shield cover 22 and extend from the front end portion of the shield cover 22 to the rear end portion. As shown in FIGS. 2A and 2B, the fulcrum shaft portion 45 described above is provided between the rear end portions of the pair of support plates 41, and on both sides in the axial direction of the fulcrum shaft portion 45, The front end portions of the pair of link plates 70 are rotatably supported.

  At the bottoms on the rear side of the pair of support plates 41, there are provided mounting plates 42 (see FIG. 2A) that are fixed to these support plates 41 and extend in the support plate width direction. The mounting plate 42 extends outward in the width direction of each support plate 41 to form a flange portion 42a, and the rear side of the pair of support plates 41 is attached to the shield cover 22 via bolts 43 inserted through the flange portion 42a. It has been.

  In addition, a tubular member 44 spanned between the pair of support plates 41 is fixed to an intermediate upper portion of the pair of support plates 41 in the front-rear direction. The tubular member 44 is disposed between a pair of fixing protrusions 17 provided on the main frame 16, and is connected to the pair of fixing protrusions 17 via bolts 18 and nuts 19 inserted into the tubular member 44 and the fixing protrusion 17. It is fixed to. That is, the front side of the pair of support plates 41 is attached to the main frame 16 via the tubular member 44 and the bolt 18 inserted through the tubular member 44.

  The link plate 70 has a protruding portion 70a that extends in the front-rear direction and protrudes upward, and is formed in a substantially triangular shape in a side view. The upper parts of the pair of link plates 70 are integrally connected via a connecting plate 71. The front sides of the pair of link plates 70 are rotatably connected to a fulcrum shaft portion 45 provided on the rear side of the support plate 41, and the pair of link plates 70 have a pair of fulcrum shaft portions 45 as a rotation fulcrum. It rotates between the support plates 41 in the vertical direction. For this reason, there is no possibility that the link plate 70 contacts the support plate 41 when the pair of link plates 70 are rotated.

  An apron side connection member 75 is rotatably connected via a rotation shaft 77 between the rear end portions of the pair of link plates 70 and the apron 25. As will be described in detail later, the apron side connecting member 75 transmits the power accompanying the upward rotation of the link plate 70 to the apron 25 and assists the apron 25 to be flipped up.

  In the present embodiment, the support plate 41 that supports the gas spring 50, the link arm member 60, the link plate 70, and the like is attached to the work machine body 10 (the main frame 16 and the shield cover 22) at two front and rear positions. However, it is also possible to employ a method in which one of the two front and rear locations is simply hooked on the work implement main body 10 and the other is bolted to the work implement main body 10.

  The apron side connection member 75 is a so-called threaded pipe configured such that the rod side member 78 can project and enter the bottom side member 76. When the rod side member 78 is rotated with respect to the bottom side member 76, The protrusion amount of the side member 78 is adjusted, and the entire length of the apron side connecting member 75 can be adjusted. A male thread is formed on the outer periphery of the rod side member 78 over substantially the entire length, and a connecting member 80 for connecting the rod side member 78 to the apron 25 is attached to the lower side of the rod side end portion 78.

  The connecting member 80 includes a connecting portion 81 connected to the apron 25 and a fixed shaft portion 83 that is attached to the connecting portion 81 and can fix the distal end portion of the rod side member 78. The connecting portion 81 includes a bottom plate portion 81a that is in contact with the apron 25, and a side plate portion 81b that extends upward from both sides of the bottom plate portion 81a. The bottom plate portion 81a is provided with a plurality of holes through which the bolts 82 can be inserted. The connecting member 80 can be detachably fixed to the apron 25 through a bolt 82 inserted through the hole.

  The side plate portion 81b is formed in a triangular shape in a side view, and a pair of side plate portions 81b are disposed opposite to each other on both sides of the bottom plate portion 81a. A fixed shaft portion 83 is disposed between the upper portions of the pair of side plate portions 81b. The fixed shaft portion 83 is formed in a columnar shape, and is supported between the corresponding side plate portions 81b so that both end portions of the fixed shaft portion 83 are rotatable in a state of being spanned between the pair of side plate portions 81b. A through hole 83 a (see FIG. 2A) through which the rod side member 78 of the apron side connection member 75 can be inserted is provided in the center portion in the axial direction of the fixed shaft portion 83. When the two nuts 79 and 79 ′ screwed to the rod side member 78 are fastened to the fixed shaft portion 83 on the peripheral surface of the fixed shaft portion 83 where the through hole 83 a opens, the distal end portion of the rod side member 78 is fixed. A recessed portion 83 b is provided for fixing to the fixed shaft portion 83. The recess 83b is provided on both opening sides of the through hole 83a.

  The distal end portion of the rod side member 78 inserted into the through hole 83a rotates the upper nut 79 screwed to the rod side member 78 so as to move into the concave portion 83b arranged on the upper side, thereby fixing the shaft portion 83. The lower nut 79 ′ is rotated and fastened so as to move into the concave portion 83b disposed on the lower side, thereby being fixed to the fixed shaft portion 83.

  The apron side connecting member 75 configured in this way can absorb the backlash of each component of the apron flip-up assist mechanism 40 by adjusting the length thereof, and the lock lever of the lock device 90 to be described later The unlocking operation 94 can be performed smoothly. In addition, although the apron side connection member 75 showed what can adjust the length, the length between the shaft part 72 (after-mentioned) provided in the link plate 70 and the rotating shaft 77 is adjustable. The link plate 70 may have a function of adjusting the length of the apron side connecting member 75 whose length can be adjusted.

  A shaft portion 72 is mounted between the protruding portions 70 a of the pair of link plates 70. The shaft portion 72 penetrates the projecting portions 70 a of both link plates 70 and projects outward, and the rear end portion of the link arm member 60 is rotatably connected to the projecting shaft portion 72. That is, the pair of link arm members 60 are rotatably connected to both end portions of the shaft portion 72 in the axial direction.

  The link arm member 60 extends along the support plate 41 and the gas spring 50 with a gap with respect to the inner surfaces of the pair of support plates 41. On the rear side of the link arm member 60, a linear long hole 60 a (see FIG. 2B) capable of movably supporting the shaft portion 72 provided on the protruding portion 70 a of the link plate 70 is provided. . When assisting the upward jumping of the apron 25, the link arm member 60 moves forward with the shaft portion 72 in contact with the rearmost end portion of the long hole 60a. As a result, the link plate 70 rotates forward about the fulcrum shaft 45.

  The front end portion of the link arm member 60 is rotatably connected to the axial end portion of the movable shaft portion 46 provided between the front sides of the pair of support plates 41. Note that the rod-side end portions 50a of the two gas springs 50 arranged side by side in the axial direction of the movable shaft portion 46 are rotatably connected to the intermediate portion of the movable shaft portion 46 in the axial direction. The movable shaft portion 46 is supported so as to be movable along a long hole 41 a (see FIG. 2B) provided on each front side of the pair of support plates 41. The long hole 41a extends linearly in the front-rear direction, and guides the movement in the front-rear direction of the movable shaft portion 46 and the pair of link arm members 60 connected thereto in accordance with the expansion and contraction of the gas spring 50.

  The gas spring 50 is connected to a fulcrum shaft portion 45 disposed on the rear side of the pair of support plates 41 and is disposed between the pair of link arm 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 41a in a substantially fully contracted state, and the rod side end 50a is positioned on the front end side of the long hole 41a in a substantially fully extended state. It is configured in a large size. A locking device 90 is provided on the front side of the pair of support plates 41 so that the gas spring 50 can be restricted from extending while being almost fully contracted.

  Next, the locking device 90 will be described with reference to FIGS. 2 (a), 2 (b), and 3. FIG. As shown in FIGS. 2A and 2B, the locking device 90 is rotatable in the vertical direction with a shaft portion 91 attached between the front end side upper portions of the pair of support plates 41 as a rotation fulcrum. A lock plate 92 and a lock lever 94 that rotates the lock plate 92 are provided. The lock lever 94 has one end connected to the lock plate 92 and the other end extending toward the apron 25 along the outer side surface of the support plate 41.

  The lock plate 92 is formed in a rectangular shape in plan view, and is disposed at the upper part between the front end portions of the pair of support plates 41. A shaft portion 91 that rotatably supports the lock plate 92 is provided between the upper portions of the front end portions of the pair of support plates 41. A pair of contact plates 92a bent downward are provided on both sides of the lock plate 92 in the width direction.

  When the gas spring 50 is in a substantially fully contracted state, the rear end portions of these contact plates 92a are in a posture (hereinafter referred to as a lock posture) along which the lock plate 92 is along the upper surface of the pair of support plates 41. It moves to a position facing the front end of the corresponding link arm member 60. For this reason, when the lock plate 92 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 92a and the gas spring 50 is extended. Can be locked.

  The lock lever 94 includes a rotation connecting member 94a (see FIG. 2A) fixed to the lock plate 92, and an arm member 94b connected to an end of the rotation connecting member 94a. The rotation connecting member 94a is a rod-like member, and is fixed to the lower surface of the lock plate 92 in a state extending in the lock plate width direction, one end portion of which protrudes to the outside of the one side (right side) support plate 41 and the other end. The part protrudes to the outside of the support plate 41 on the other side (left side). A tension spring 96 is provided between the end portion of the rotation connecting member 94 a projecting to the outside of the one side support plate 41 and the one side support plate 41.

  The tension spring 96 has a rotation range of the lock plate 92 between a lock position where the gas spring 50 is locked by the lock plate 92 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 92 rotates to the lock position side from the position where the tension spring 96 is most extended, the lock plate 92 is biased downward by the tension force of the tension spring 96 to hold the lock plate 92 in the locked position. Further, when the lock plate 92 is rotated to the unlocking side from the position where the tension spring 96 is most extended, the lock plate 92 is biased upward by the pulling force of the tension spring 96 and the lock plate 92 is opened. Hold on.

  As shown in FIG. 2A, the arm member 94b has a front end pivotally supported by the other end of the rotation connecting member 94a and a rear side extending rearward along the support plate 41. The rear end portion of the arm member 94b forms a handle portion 94b1 that bends away from the support plate 41. The rear side of the arm member 94b is supported movably in the front-rear direction by an arm support member 97 attached to the support plate 41 and extending toward the arm member 94b.

  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 90. Locked by. The link plate 70 extends in the front-rear direction. Further, the shaft portion 72 inserted through the long hole 60a (see FIG. 2B) of the link arm member 60 is located at the rear end portion of the long hole 60a. 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 41 a of the support plate 41.

  In the case where the apron 25 is flipped up when the apron raising assist mechanism 40 is in such a state, first, the operator performs an operation of grasping the handle portion 94b1 of the lock lever 94 of the locking device 90 and pulling it backward. Do. When the handle portion 94b1 is pulled rearward, the lock plate 92 rotates to the front side against the urging force of the tension spring 96 via the rotation connecting member 94a. Accordingly, as shown in FIG. 3, the lock plate 92 is rotated upward, the rear end portion of the contact plate 92 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, the gas spring 50 extends as shown in FIG. 4, and the movable shaft portion 46 connected to the rod side end portion 50a moves to the front side of the long hole 41a of the support plate 41. 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 92a and the operator pulls up the apron 25, the front end portion of the contact plate 92a is linked to the link plate 92a as shown in FIG. The lock plate 92 is pushed further forward by the front end portion of the arm member 60, and eventually the lock plate 92 rotates downward with the shaft portion 91 as a fulcrum, and is biased toward the lock position (lock standby state) and apron. The raising of 25 ends.

  When the apron is pulled up, the pair of link arm members 60 move to the front side, and the link plate 70 rotates to the front side with the fulcrum shaft portion 45 as a rotation fulcrum. As a result, the elastic force of the gas spring 50 acts on the apron 25 via the apron-side connecting member 75 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 90 is already in the lock standby state. When the operator presses down the apron 25, the front end of the link arm member 60 moves backward while sliding on the lower surface of the contact plate 92a, as shown in FIG. As shown in FIG. 2B, the lock plate 92 is locked at the same time as the front end portion of the link arm member 60 is removed from the lower surface of the contact plate 92a, and the apron 25 returns to a state where normal work can be performed. To do.

  Thus, 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 (left-right 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. Moreover, since the apron raising auxiliary mechanism 40 is unitized and can be attached to and detached from the tilling work machine 1, it can be placed at any place as long as it can be placed between the shield cover 22 and the apron 25. Can be installed. Therefore, the apron raising assist mechanism 40 has a large degree of freedom in arrangement with respect to the tilling work machine 1 and can be mounted on different working machines.

  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 70 pivots forward about the fulcrum shaft 45, but the forward movement of the link arm member 60 is regulated by the lock device 90. The link arm member 60 cannot move to the front side.

  However, since the shaft portion 72 of the link plate 70 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.

  In this manner, 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 90. 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.

1 Tillage work machine (rotary work machine)
10 working machine body 20 tillage rotor (working rotor)
22 Shield cover 25 Apron 40 Apron flip-up assist mechanism 41 Support plate (support member)
45 fulcrum shaft 50 gas spring 60 link arm member 70 link plate (link member)
75 Apron side connecting member 90 Locking device

Claims (8)

An apron raising assist mechanism for assisting the raising of the apron that is pivotably provided in the vertical direction at the rear end of the shield cover that covers the upper side of the work rotor provided in the tilling work machine,
A support member provided above the shield cover and extending in the front-rear direction;
A gas spring whose front side is supported by the support member so as to be movable in the front-rear direction and whose rear side is rotatably connected to the upper side of 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 extends rearward along the gas spring;
An apron side connecting member that is pivotally connected to the rear side of the link arm member and whose lower side is pivotally connected to the apron;
An apron flip-up assisting mechanism that is detachably attached to the tillage work machine. Between the rear side of the link arm member and the apron side connecting member, there is a link member that is pivotable in the front-rear direction around a fulcrum shaft provided above the shield cover. The apron flip-up assist mechanism according to claim 1, wherein The apron springing-up assist mechanism according to claim 1 or 2, wherein the support member is provided with a lock device that restricts the extension of the gas spring in the extension direction. The apron-side connection member can be adjusted in length. The apron flip-up assist mechanism according to any one of claims 1 to 3. 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;
The 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 the rear side is pivotally connected to an apron side connection member provided on the upper surface of the apron so as to be rearward along the gas spring. An apron flip-up assist mechanism comprising a link arm member extending to the side,
The tiller working machine, wherein the apron raising assist mechanism is detachably attached to the tiller working machine. A link member rotatable between a rear side of the link arm member of the apron flip-up assist mechanism and the apron side connection member about a fulcrum shaft provided above the shield cover in the front-rear direction. The tilling work machine according to claim 5, wherein The tilling work machine according to claim 5 or 6, wherein the support member is provided with a lock device that regulates extension of the gas spring in the extension direction. The tiller working machine according to any one of claims 5 to 7, wherein the apron side connecting member is adjustable in length.

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