JP5069944B2 - Apron lifting assist device for rotary work machine - Google Patents

Description

  The present invention relates to a rotary working machine in which an upper end portion of an apron is pivotally supported in a vertically rotatable manner at a rear end portion of a shield cover that covers an upper portion of a working rotor rotatably supported by a working machine body.

  Such an apron provided on the rear part of a rotary work machine jumps the apron when scraping off the soil attached to the front part of the apron or the work rotor, or when replacing the tillage claw provided on the work rotor. It is common to scrape soil and replace tillage nail while keeping it in a raised state, but since the apron is heavy, the work of jumping up the apron is heavy labor for the operator. Further, in order to hold the apron in a state in which the apron is flipped up, it is necessary to operate a lock device provided on the compression rod to lock the rotation of the apron. This operation is also troublesome for the operator.

  Therefore, as described in Patent Document 1, an apron device (in the literature, a leveling plate device) that facilitates these operations has been proposed. As shown in FIG. 7 (side view), the apron device 90 is arranged in the vertical direction at the rear end portion of the shield cover 22 that covers the upper portion of a work rotor (not shown) rotatably provided at the lower portion of the machine casing 91. An apron 25 that is pivotably attached to the apron 25 and extends rearward and obliquely downward, and a holding arm 92 that is pivotally supported by the rear portion of the machine frame 91 disposed above the apron 25 so as to be pivotable in the vertical direction and extends rearward. The bearing body 93 is attached to the rear part of the holding arm 92 so as to be rotatable in the front-rear direction, and the upper frame is slidably inserted into the bearing body 93 and the lower end part is provided on the rear upper surface of the apron 25. A holding rod 95 pivotally supported on the upper part of 94, a holding rod 95 above the bearing body 93, and a holding rod 95 below the bearing body 93 are wound around the holding body 93 and held on the bearing body 93. Coil that urges 杆 95 up and down Made with a Rubane 96, 96 '.

  According to this apron device 90, when scraping off the dirt adhering to the front portion of the apron 25 and the working rotor when not working, the apron 25 is moved rearward while rotating the rear portion of the holding arm 92 upward. The lower end edge is lifted, and the apron 25 is rotated upward about the rotation fulcrum P with the shield cover 22. When the central axis of the holding rod 95 in the longitudinal direction exceeds the rotation fulcrum R of the holding arm 92 with respect to the machine frame 91, the apron 25 is biased forward, and the bearing body 93 is provided on the machine frame 91. In contact with the stopper frame 97, the apron 25 is held at the upper non-working position.

Japanese Utility Model Publication No. 55-12324

  In this conventional apron device 90, the apron 25 in the working posture can be moved to a predetermined non-working position by simply lifting the apron 25, but the worker moves the apron 25 in the working posture upward. In order to lift it, it is necessary to lift the heavy apron 25 to a stage where it rotates within a certain range, and this lifting work is still hard work for the worker.

  The present invention has been made in view of the above circumstances, and assists in raising the apron of a rotary work machine that can reduce the labor burden on the operator when the apron is lifted and moved to a predetermined non-working position. An object is to provide an apparatus.

In order to solve such a problem, the present invention has the following features. One of the features is that the work rotor (for example, the tilling rotor 20 in the embodiment) rotatably supported by the work machine body is covered with a shield cover, and the upper end of the apron is vertically moved at the rear end of the shield cover. In a rotary work machine that is pivotably supported, the work can be expanded and contracted by being pivoted between the work machine main body and the apron. When the apron in the working position is turned upward when not working, the apron is moved upward. Expansion / contraction urging means (for example, the gas spring 41 in the embodiment) that extends while assisting the rotation of the work implement , and the expansion / contraction urging means has a rotation fulcrum on the work machine main body side when the apron is in the working posture. The apron is arranged coaxially or substantially coaxially with the rotation fulcrum with respect to the work machine main body, and the position of the rotation fulcrum on the work machine main body side is movable when not working .

According to this feature, the apron is pivoted between the work implement body and the apron and can be expanded and contracted. When the apron in the working position is rotated upward during non-working, the apron is supported to rotate upward. By providing the expansion / contraction urging means that extends while the apron in the working posture is rotated upward when not working, the expansion / contraction urging means assists the upward rotation of the apron while extending. For this reason, the heavy apron can be easily lifted and moved to the non-working position, and the labor of the operator of the apron flip-up work can be reduced. Further, the expansion / contraction biasing means is configured such that when the apron is in the working posture, the rotation fulcrum on the side of the work machine body is coaxially or substantially coaxial with the rotation fulcrum of the apron with respect to the work machine body. Since the position of the rotation fulcrum on the machine body side is movable, the position of the rotation fulcrum on the work machine body side is coaxial or substantially coaxial with the rotation fulcrum of the apron with respect to the work machine body when the apron is in the working posture. Always located on top. For this reason, since the expansion / contraction urging means is integrated with the apron, the upward rotation of the apron is not assisted by the urging force of the expansion / contraction urging means.

  Also, one of the features is that the expansion / contraction biasing means is supported so that the rotation fulcrum on the work machine main body side can move up and down with respect to the work machine main body, and the apron in the working posture is rotated upward when not working. Then, the rotation fulcrum on the side of the work machine main body moves below the rotation fulcrum of the apron with respect to the work machine main body, and assists the upward rotation of the apron while extending.

  According to this feature, the rotation fulcrum on the working machine main body side of the expansion / contraction biasing means is supported so as to be movable in the vertical direction with respect to the working machine main body, and when the apron in the working posture is rotated upward when not working. The apron is lifted up by moving the apron of the apron toward the lower side of the apron with respect to the main body of the work implement and assisting the apron to rotate upward while the expansion / contraction biasing means is extended. Work can be done easily.

  One of the characteristics is that the expansion / contraction biasing means is a gas spring.

  According to this feature, when the contracted gas spring is provided between the work implement main body and the apron by using the expansion / contraction biasing means as a gas spring, the expansion / contraction biasing means always biases the apron so as to extend. For this reason, when the apron in the working posture is rotated upward during non-working, an auxiliary force for rotating the apron upward by the expansion and contraction urging means acts to facilitate the apron lifting work. When the apron is pushed down to return the apron moved to the non-working position to the working position, the gas spring is gradually reduced and the apron is rotated downward to the working position. For this reason, it is possible to prevent the apron from rotating suddenly downward.

  According to the apron flipping-up assist device for a rotary work machine according to the present invention, the rotary work machine that has the above-described characteristics can reduce the labor burden on the operator when lifting the apron and moving it to a predetermined non-working position. An apron flip-up assisting device can be provided.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an apron raising assist device for a rotary working machine according to the present invention will be described below with reference to FIGS. In addition, this embodiment demonstrates the cultivation working machine for tilling and crushed soil as object.

[First embodiment]
First, before explaining the apron raising assist device, a tilling work machine equipped with the apron raising assist device will be described. As shown in FIG. 1 (side view), the tillage work machine 1 includes a work machine body 10. The work machine main body 10 is provided with a top mast 12 and a lower link connecting portion 13 connected to a three-point link connecting mechanism provided at a rear portion of a traveling machine body (not shown) at a front portion of a main body frame 11 extending in the left-right direction. It is attached to the rear part of the traveling machine body so that it can be raised and lowered. A gear box (not shown) having an input shaft 14 for transmitting power from the traveling machine body 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 on both sides in the width direction from the gear box, and a chain transmission case 18 is suspended from an 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 of the main frame 16 so as to face the chain transmission case 18. A transmission mechanism is provided in the left main frame 16 and the chain transmission case 18, and a tilling rotor 20 having a number of tilling claws attached between the chain transmission case 18 and the lower end of the side frame is rotatably attached. ing. The power transmitted to the input shaft 14 is transmitted to the transmission mechanism in the main frame 16 and the chain transmission case 18 through the gear box, and the tilling rotor 20 is rotated in a predetermined direction.

  The upper side of the tilling rotor 20 is covered with a shield cover 22, and side covers 23 are provided at both ends in the width direction on the rear side of the shield cover 22. That is, the work machine body 10 includes a main body frame 11, a top mast 12, a lower link connecting portion 13, a gear box, a chain transmission case 18, a side frame, a tilling rotor 20, a shield cover 22, a side cover 23, and the like. Configured.

  A front end portion of the apron 25 is pivotally supported at the rear end portion of the shield cover 22 so as to be rotatable in the vertical direction. The apron 25 extends rearward, and the tip of the apron 25 contacts the ground to level the cultivated soil surface. A compression spring 31 is wound between the upper surface of the apron 25 and the main frame 16 to provide a compression rod 30 that can adjust the working pressure of the apron 25. The compression rod 30 is compressed against the apron 25. A lock device 32 that locks the rod 30 and restricts the vertical rotation of the apron 25 is provided. The details of the compression rod 30 will be described later.

  On the front side of the shield cover 22, a pair of ground wheels 35 are provided that travel in contact with the farm field while keeping the working depth of the tilling rotor 20 constant during work according to the rear wheel width of the traveling machine body.

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. It is disguised. The compression rod 30 is configured such that the working pressure of the apron 25 can be adjusted by the pressure of the compression spring 31 wound between the washer 33 attached to the compression rod 30 and the lock device 32 . The washer 33 is attached so that its position can be changed along the axial direction of the compression rod 30.

  On the outside of the side cover 23 on the chain transmission case 18 side, an apron flip-up assisting device 40 is provided. As shown in FIGS. 1 and 2 (partial plan view), the apron flip-up assisting device 40 is disposed on the gas spring 41 disposed on the outer side of the side cover 23 and on the outer upper portion of the side cover 23. A fulcrum lock device 50 is provided. The gas spring 41 is disposed on the inner side in the width direction than the chain transmission case 18 and is connected to a cylinder tube 42 and a piston slidably inserted into the cylinder tube 42 and extends from one end of the cylinder tube 42. And a cylinder rod 43 to be taken out. When no load is applied to the cylinder rod 43, the gas spring 41 has a predetermined gas reaction force and is fully extended. When the load is applied to the cylinder rod 43 in the direction in which the gas spring 41 contracts, The gas reaction force is configured to gradually increase in accordance with the amount of movement of the cylinder rod 43.

  The rod-side end of the gas spring 41 is provided with a pair of flange portions 44 that are opposed to each other at a predetermined interval in the width direction and extend in the longitudinal direction, and each flange portion 44 is provided with an insertion hole. A rotation shaft 45 attached to the distal end portion of the link member 51 described later is inserted into the insertion hole, and the rod side end portion of the gas spring 41 is supported to be movable in the vertical direction via the link member 51. The bottom end of the gas spring 41 is pivotally connected to a mounting seat 28 provided at the left end of the apron 25.

  The base end of the link member 51 is pivotally connected to the outside of the rear upper portion of the side cover 23 so as to be pivotable in the vertical direction, and the distal end side of the link member 51 extends along the side cover 23 and extends to the distal end. A rotating shaft 45 is attached to the shaft. The rotation shaft 45 is inserted through the insertion holes of the pair of flange portions 44 and rotatably supports the rod side end portion of the gas spring 41. For this reason, the central axis of the rotation shaft 45 is the rotation fulcrum O at the rod side end of the gas spring 41. When the apron 25 extends obliquely downward so that the tillage operation can be performed, the gas spring 41 is substantially fully contracted, and the rotation fulcrum O at the rod side end of the gas spring 41 is the working machine of the apron 25. It arrange | positions coaxially with the rotation fulcrum P with respect to the main body 10, or substantially coaxial. For this reason, when the apron 25 is in the working posture, the rotation of the apron 25 is not assisted by the biasing force of the gas spring 41.

  The apron flip-up assisting device 40 configured in this way has a fulcrum lock device 50 that can hold the rotation fulcrum O at the rod side end of the gas spring 41 coaxially or substantially on the axis with the rotation fulcrum P of the apron 25. have. The fulcrum locking device 50 includes a movement restricting plate 53 that protrudes from the outer upper portion of the side cover 23, and a fulcrum holding mechanism portion 60 that cooperates with the movement restricting plate 53 to sandwich the distal end portion of the link member 51. .

  The movement restricting plate 53 is provided outside the side cover 23 and in a position close to the rotation center axis Q passing through the rotation fulcrum P of the apron 25 and can come into contact with the upper end of the link member 51. . On the other hand, the fulcrum holding mechanism 60 has a lock plate 61 whose base end is attached to the outside of the side cover 23 so as to be rotatable in the vertical direction, and whose tip is in contact with the lower end of the link member 51. A grip portion 62 that is fixed to the upper portion of the cover plate and extends upward, and a tension spring 63 that is attached between the lock plate 61 and the side cover 23 and biases the lock plate 61 downward.

  The lock plate 61 has a protruding piece 61 a at its base end, and when the protruding piece 61 a comes into contact with a locking pin 64 provided on the side cover 23, the distal end portion of the lock plate 61 and the movement restricting plate 53. The tip of the link member 51 can be held between the two. Since the lock plate 61 is always biased downward by the tension spring 63, the lock plate 61 can be maintained in a state where the tip of the link member 51 is clamped in cooperation with the movement restricting plate 53. is there. For this reason, if the front-end | tip part of the link member 51 is clamped, the rotation fulcrum O by the side of the rod of the gas spring 41 can be hold | maintained coaxially or substantially coaxially with the rotation fulcrum P of the apron 25.

  When the handle 62 is tilted forward while the rotation fulcrum O on the rod side of the gas spring 41 is held coaxially or substantially coaxially with the rotation fulcrum P of the apron 25, the grip spring 62 resists the tension spring 63. When the lock plate 61 is rotated upward, the distal end portion of the lock plate 61 is disengaged from the distal end of the link member 51, and the lock holding state of the rotation fulcrum O on the rod side of the gas spring 41 can be released.

  When the apron 25 in the working posture is lifted upward and moved to the non-working position in the non-working plow working machine 1 configured as described above, first, the lock is provided by the lock device 32 provided on the compression rod 30. While releasing the state, the washer 33 is made free with respect to the compression rod 30. Then, the handle 62 of the support holding mechanism 60 of the apron raising assist device 40 is tilted forward, and the lock holding of the rotation fulcrum O on the rod side of the gas spring 41 is released. When the apron 25 is lifted upward, as shown in FIG. 3A (side view), the apron 25 pivots upward about the pivot fulcrum P, and at the same time, the bottom end of the gas spring 41 As the portion moves upward, the rod side end of the gas spring 41 gradually moves downward via the link member 51. Further, as the apron rotates upward, the lock device 32 moves to the front side of the compression rod 30, and the compression spring 31 and the washer 33 move to the front side of the compression rod 30. Then, when the rotation fulcrum O on the rod side end side of the gas spring 41 moves below the rotation fulcrum R on the bottom side, the rear side of the gas spring 41 tilts obliquely upward, and the gas spring 41 extends. The apron 25 is urged upward by the upward component of the urging force of the gas spring 41. For this reason, the operator can flip up the apron 25 upward with a light labor load.

When the apron 25 moves to a predetermined non-work position Pn, the worker stops lifting the apron 25 as shown in FIG. 3B (side view). At this time, the gas spring 41 tries to extend and bias the apron 25 upward, so that the operator can easily maintain or stop the apron 25 at the non-working position Pn with a small force. Then, the compression rod 30 is fixed by the lock device 32, and the apron 25 is fixed to the work machine main body 10 through the compression rod 30.

  As described above, when the apron 25 in the working posture is rotated upward during non-working, the upward force of the apron 25 is assisted by the force from the gas spring 41. For this reason, the heavy apron 25 can be flipped up with a light load and moved to the predetermined non-working position Pn, and the labor of the worker in the apron lifting work can be reduced.

  On the other hand, when the apron 25 moved to the non-working position Pn is returned to the working posture, the locking device 32 is operated to release the locked state of the compression rod 30 with respect to the apron 25 and press the apron 25 downward. When the apron 25 is pressed downward, the apron 25 rotates downward about the rotation fulcrum P. At the same time, the gas spring 41 contracts while the bottom end moves downward and the rod end moves upward. At this time, since the gas spring 41 gradually shrinks due to its own buffering effect, even if the weight of the apron 25 acts, the apron 25 does not rotate at a high speed, and the apron 25 does not drop rapidly. .

  When the apron 25 returns to the working posture, the rotation fulcrum O on the rod side of the gas spring 41 moves coaxially or substantially coaxially with the rotation fulcrum P of the apron 25, and the gas spring 41 is integrated with the apron 25. It becomes. Then, the handle 62 of the support holding mechanism 60 of the apron raising assist device 40 is tilted rearward, and the tip of the link member 51 is sandwiched between the movement restricting plate 53 and the lock plate 61, and the gas The rod side end of the spring 41 is held. Then, the washer 33 is moved to a predetermined position of the compression rod 30 and fixed.

  Thus, even if the apron 25 is pushed down to return the apron 25 moved to the non-working position Pn to the working posture, the apron 25 does not drop rapidly. Further, when the apron 25 returns to the working posture, the gas spring 41 is integrated with the apron 25, so that the upward rotation of the apron 25 is not assisted by the biasing force of the gas spring 41.

  In the embodiment described above, when the apron 25 is in the working posture, the rotation fulcrum O at the rod side end of the gas spring 41 is coaxially or substantially coaxial with the rotation fulcrum P of the apron 25 with respect to the work implement body 10. Although the case where the apron 25 is in the working posture is shown, the rotation fulcrum O at the rod side end of the gas spring 41 moves to a position slightly above the rotation fulcrum P of the apron 25, or the rotation fulcrum. O may be moved to a position slightly below the pivot point P of the apron 25.

  When the rotation fulcrum O moves to a position slightly above the rotation fulcrum P of the apron 25, the apron 25 is always urged downward by the gas spring 41, and the rotation fulcrum O becomes the rotation fulcrum P of the apron 25. When moving to a slightly lower position, the apron 25 is always urged upward by the gas spring 41. For this reason, when the position of the rotation fulcrum O with respect to the rotation fulcrum P when the apron 25 is in the working posture can be selectively set, the apron 25 is always urged downward according to the field conditions. There are three modes: a biased state, an upward biased state in which the apron 25 is always biased upward, and a neutral state in which the apron 25 is not biased when in the working posture.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the second embodiment, only differences from the above-described first embodiment 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. 4 (side view) and FIG. 5 (plan view), the apron flip-up assisting device 40 ′ is a guide provided with a rotation fulcrum O on the rod side of the gas spring 41 on the outside of the side frame 23. It is configured to be movable along the hole 72.

  This apron flip-up assisting device 40 ′ includes a gas spring 41 pivoted to the apron 25, a guide plate 70 attached to the side frame 23 and having the guide hole 72 described above, and a rod side end of the gas spring 41. And a fulcrum holding member 80 for holding the portion at a predetermined position.

  The guide plate 70 is formed in an inverted U shape in plan view and has a pair of side plate portions 71 that extend in the vertical direction and face each other in the width direction, and each side plate portion 71 has an arc-shaped guide hole that extends in the vertical direction. 72 is provided. The guide plate 70 is fixed to the side cover 23 such that the inner side plate portion 71 is disposed at a position having a predetermined distance outward from the side cover 23. A pair of flange portions 44 at the rod side end of the gas spring 41 are inserted between the pair of side plate portions 71, and the rotation shaft 73 is inserted into the guide hole 72 of the side plate portion 71 and the insertion hole of the flange portion 44. The rod side end of the gas spring 41 is movable in the vertical direction along the guide hole 72.

  The fulcrum holding member 80 is a plate-like member that is disposed between the pair of flange portions 44 in a plan view and extends in the front-rear direction. The fulcrum holding member 80 has a front end pivotally connected to the side cover 23 so as to be pivotable in the vertical direction, and a rear side pivotable in the vertical direction. A locking step portion 81 is provided, and a handle portion 82 extending rearward from the locking step portion 81 is provided. When the pivot fulcrum O on the rod side of the gas spring 41 is moved coaxially or substantially coaxially with the pivot fulcrum P of the apron 25, the fulcrum holding member 80 is tilted rearward so that the locking step 81 rotates. It contacts the lower side of the moving shaft 73 and restricts the downward movement of the rotating shaft 73. Further, when the rotation fulcrum O on the rod side of the gas spring 41 is located on the same axis as or substantially on the same axis as the rotation fulcrum P of the apron 25, the rotation shaft 73 moves to the upper end of the guide hole 72. Thus, the upward movement of the rotation shaft 73 is restricted.

  When the apron 25 is in the working posture, the apron raising assist device 40 ′ has the rotation fulcrum O on the rod side of the gas spring 41 positioned coaxially or substantially coaxially with the rotation fulcrum P of the apron 25. A rotation shaft 73 attached to the rod side end of the gas spring 41 is held by the guide hole 72 and the fulcrum holding member 80.

  When the apron raising assist device 40 ′ configured as described above is used to lift the apron 25 in a working posture upward and move it to the non-working position Pn when not working, first, a lock provided on the compression rod 30 is used. The locked state by the device 32 is released, and the washer 33 is made free with respect to the compression rod 30. Then, the handle portion 82 of the support holding member 80 of the apron flip-up assisting device 40 ′ is tilted forward to release the locked state of the rod side end of the gas spring 41. When the apron 25 is lifted upward, as shown in FIG. 6A (side view), the apron 25 pivots upward about the pivot fulcrum P, and at the same time, the bottom end of the gas spring 41 The part moves upward via the apron 25 and the rod side end of the gas spring 41 descends along the guide hole 72. Then, when the rotation fulcrum O at the rod side end of the gas spring 41 moves upward from the bottom rotation fulcrum P, the rear side of the gas spring 41 tilts obliquely upward, and the gas spring 41 extends. The apron 25 is biased upward by the force of the upward component of the biasing force of the gas spring 41. For this reason, the operator can flip up the apron 25 upward with a light labor load.

When the apron 25 moves to a predetermined non-working position Pn, as shown in FIG. 6B (side view), the worker stops lifting the apron 25. At this time, since the gas spring 41 urges the apron 25 upward to further extend, the operator can easily maintain or stop the apron 25 at the non-working position Pn with a small force. Then, the compression rod 30 is fixed by the lock device 32, and the apron 25 is fixed to the work machine main body 10 through the compression rod 30.

  As described above, when the apron 25 in the working posture is lifted when not working, the upward force of the apron 25 is assisted by the force from the gas spring 41. For this reason, the heavy apron 25 can be flipped up with a light load and moved to a predetermined non-working position Pn, and the labor of the apron flipping-up worker can be reduced as in the first embodiment. it can.

  On the other hand, when the apron 25 moved to the non-working position Pn is returned to the working posture, the locking device 32 is operated to release the locked state of the compression rod 30 with respect to the apron 25 and press the apron 25 downward. When the apron 25 is pressed downward, the apron 25 rotates downward about the rotation fulcrum P. At the same time, the bottom end of the gas spring 41 moves downward via the apron 25, and the rod end moves upward along the guide hole 72, and the gas spring 41 is compressed and contracted. At this time, since the gas spring 41 is gradually reduced by its own buffer effect, the gas spring 41 is not rapidly reduced.

  When the apron 25 returns to the working posture, the rotation fulcrum O on the rod side of the gas spring 41 moves coaxially or substantially on the axis with the rotation fulcrum P of the apron 25. Then, when the handle portion 82 of the support holding member 80 of the apron flip-up assisting device 40 ′ is tilted rearward, the locking step portion 81 comes into contact with the lower side of the rotation shaft 73 and moves downward to the rotation shaft 73. Regulate the movement of Further, the rotation shaft 73 contacts the upper end of the guide hole 72. For this reason, the rotation fulcrum O on the rod side of the gas spring 41 is held coaxially or substantially on the axis with the rotation fulcrum P of the apron 25.

  As described above, when the apron 25 is pushed down to return the apron 25 moved to the non-working position to the working posture, the gas spring 41 is gradually reduced, so that the lowering speed of the apron 25 due to the reduction of the gas spring 41 is suppressed. be able to.

  In the present embodiment, the gas spring 41 is taken as an example of the expansion / contraction biasing means, but an expansion / contraction cylinder incorporating a compression spring may be used. Further, as an example of the rotary work machine, the tilling work machine 1 for plowing and crushed soil is targeted, but a tilling work machine for plowing may be used as a target.

The side view of the tilling work machine which mounts the apron raising auxiliary device concerning a 1st embodiment of the present invention is shown. The partial top view of the tilling work machine which mounts the apron raising auxiliary device concerning a 1st embodiment of the present invention is shown. The side view of the tillage working machine for demonstrating operation | movement of an apron flipping-up assistance apparatus is shown. The side view of the tillage working machine which mounts the apron raising assistance apparatus concerning 2nd Embodiment of this invention is shown. The partial top view of the tillage working machine which mounts the apron raising auxiliary | assistance apparatus concerning 2nd Embodiment of this invention is shown. The side view of the tillage working machine for demonstrating operation | movement of the apron raising auxiliary | assistance apparatus concerning 2nd Embodiment of this invention is shown. The side view of the conventional apron apparatus is shown.

1 Tillage work machine (rotary work machine)
10 working machine body 20 tillage rotor (working rotor)
22 Shield Cover 25 Apron 40, 40 'Apron Bounce Auxiliary Device 41 Gas Spring
O, P fulcrum

Claims (3)

In a rotary work machine in which an upper part of an apron is pivotally supported so as to be pivotable up and down at the rear end part of the shield cover by covering the upper part of the work rotor rotatably supported by the work machine body with a shield cover.
Extendable and retractable by being pivoted between the work implement body and the apron, and when the apron in the working position is rotated upward during non-working, the apron is extended while assisting the upward rotation. With biasing means ,
The expansion / contraction urging means is arranged such that when the apron is in a working posture, the rotation fulcrum on the work implement main body side is arranged coaxially or substantially coaxially with the rotation fulcrum of the apron with respect to the work implement main body. An apron flip-up assisting device for a rotary working machine, wherein a position of a rotation fulcrum on the working machine main body side is movable during work . The expansion / contraction urging means is supported so that a rotation fulcrum on the work machine main body side is movable in the vertical direction with respect to the work machine main body, and when the apron in a working posture is rotated upward when not working, moves downward than the pivot point pivot point of the machine body side relative to the machine body of the apron, according to claim 1, characterized in that to assist the upward rotation of said apron while stretched Apron flip-up assist device for rotary work machines. The apron flip-up assisting device for a rotary working machine according to claim 1 or 2 , wherein the expansion / contraction biasing means is a gas spring.

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