JP5322673B2 - Scraping work machine and mudguard used for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a mud guard member attached to the front side of a puddling implement to have a function for drawing a suspended matter such as straw floating on the muddy water in a field into the inside of a shield cover. <P>SOLUTION: The puddling implement 10 attached to the rear part of a tractor 20 and including a tilling rotor 6 rotating around a horizontal axis by receiving the power from the tractor 20, and a shield cover 2 covering above the tractor, has the mud guard member 1 connected to the front side in the traveling direction of the shield cover 2. The mud guard member 1 has a plurality of fragments 1e divided in the longitudinal direction, and clearances 1e inclined downward from both sides toward the center in the width direction of the puddling implement 10 are provided between adjacent receiving pieces 1e and 1e. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention is a scraper working machine equipped with a tilling rotor that is attached to the rear part of a tractor and cultivates a farm field, and in particular, for the purpose of preventing scattering of mud and the like to be splattered by tilling claws protruding from the tilling rotor. The present invention relates to a scraping work machine in which a mudguard material is attached to the front side of a shield cover, and a mudguard material used therefor.

  When the tilling rotor of the substitute scraper rotates down-cut, the muddy water scraped when the tilling claw comes out of the muddy water surface is scattered toward the shield cover by centrifugal force. This muddy water flows toward the front side along the inner peripheral surface of the shield cover. However, since the muddy water drops from the front end portion of the shield cover, it hardly scatters to the tractor.

  However, when the tilling nail bites into the muddy water, the surface of the water is struck violently, so that the muddy water scatters, and the scattered muddy water may reach the tractor located in front of the scraper. In such a case, a splash prevention cover may be connected in front of the shield cover for the purpose of preventing muddy water from scattering (see Patent Document 1).

  When the anti-scattering cover is connected in a state of being suspended in front of the shield cover as in Patent Document 1, the anti-scattering cover faces the direction along the direction of rotation of the tilling rotor. It is considered that the mud and mud scattered can be blocked to some extent.

  However, since the anti-scatter cover is connected to the shield cover and suspended, the anti-scatter cover may be caught on the tilling rotor side during scraping work, or it may turn up to the front side due to the scattered mud. The scattering prevention cover cannot be expected to have a stable scattering prevention effect. In this respect, it is considered to be advantageous to fix the scattering prevention cover to the shield cover in a state in which the scattering prevention cover is inclined from the upper side to the lower side in the advancing direction (see Patent Document 2).

  On the other hand, the plowing machine runs on the field mainly for the purpose of cultivating the field where mud is stored on the mud before the planting of the paddy field. Since these floating substances are often caught in seedlings at the time of planting, it is desirable to remove them from the field. From the viewpoint of removing this floating substance, a front rake body is also attached to the work machine to draw the floating substance such as firewood to the center side in the work machine width direction in order to plow the floating substance into the cultivated soil. Reference 3).

Japanese Patent Laid-Open No. 2001-16904 (Claim 1, Claim 2, Paragraphs 0011, 0017 to 0019, FIGS. 1 to 4) Japanese Utility Model Publication No. 49-43406 (Specification, page 3, line 5 to line 17, drawing) Japanese Patent Laying-Open No. 2005-13008 (claim 8, paragraphs 0021, 0022, 0026, FIG. 8)

  In Patent Document 2, as described above, the scattering prevention cover is fixed to the shield cover while being tilted backward from the top to the bottom, but the scattering prevention cover itself prevents the muddy water from scattering while performing the scraping work. It does not have the function of guiding the floating material in front of it to the center side in the work machine width direction. On the other hand, when the tip of the anti-scattering cover is immersed in muddy water, the suspended matter may be diffused outside the tilling rotor.

  In Patent Document 3, the front rake body connected to the front side of the work machine allows forcibly floating floating material such as firewood existing in front of the work machine into the mud of the field. Since it does not have the function of preventing the scattering of mud and mud from the inside, it is not used as the above-mentioned scattering prevention cover.

  In view of the above background, the present invention proposes a scraper working machine in which a mudguard material having a function of guiding suspended matter to the tilling rotor side is mounted in front of the shield cover, and a mudguard material used therefor.

According to a first aspect of the present invention, there is provided a scraper working machine including a tilling rotor that is attached to a rear portion of a tractor and that rotates around a horizontal axis by receiving power from the tractor and a shield cover that covers the top thereof. ,
It has a receiving piece divided into a plurality in the longitudinal direction, and is arranged with a gap between the adjacent receiving pieces with an inclination from the upper side to the lower side toward the central part from both sides in the width direction of the scraping work machine. The mudguard material is connected to the front side in the traveling direction of the shield cover.

  Since the front rake body is arranged in front of the work machine (including the skimming work machine) as described above, the floating substance can be guided to the work machine side, so that the floating substance is guided to the shield cover. In order to achieve this, it is appropriate to dispose a member that can correspond to the front rake body in front of a scraping work machine (hereinafter referred to as a work machine in this item). Therefore, a mudguard material is connected to the front side of the shield cover in the traveling direction, and this mudguard material has a function of attracting mud water to guide the mud water present on the front side of the working machine in the traveling direction. It becomes possible.

  Since the mudguard is connected to the front side of the shield cover, the mud and mud that the tilling rotor scoops up is received on the back and dropped, and the tractor is prevented from scattering to the tractor side. From the viewpoint of protecting from muddy water and mud, it is basically formed in a plate shape with length and width in the width direction and height direction of the work equipment. Moreover, from the meaning of dropping muddy water and mud received on the back side to the front side without scattering to the front side, the thickness is such that it is not easily bent and deformed to the front side by pressure due to muddy water or the like.

  On the other hand, since the mudguard material is connected to the shield cover of the work machine, the lower end part may be immersed in the mud water, so that the mudguard material may receive excessive resistance from the rice stocks and soil blocks during work. It is desirable to have elasticity that can be appropriately bent and deformed by resistance from the rice stock and soil mass received by the lower end. From the above, the mudguard is made of a material having moderate elasticity such as a synthetic resin such as polypropylene, polyethylene, polyvinyl chloride, vinyl acetate, or a rubber (synthetic rubber), or a metal material such as a steel plate or stainless steel. Produced.

  The mudguard material has a plurality of receiving pieces divided in the longitudinal direction, and there is a gap between the adjacent receiving pieces with an inclination from the upper side to the lower side toward the center part from both sides in the width direction of the work machine. It has been. The gap between the adjacent receiving pieces serves to collect most of the muddy water that has been picked up by the tilling rotor and collided with the back surface of the receiving piece and descends to the lower end of the receiving piece.

  The muddy water that collides with the inner peripheral surface of the shield cover and the back of the receiving piece and flows down, the muddy water that has collided with the area above the gap falls to the gap along the back of the receiving piece, along the inclination of the gap, It flows down from both sides in the width direction toward the center. At this time, the muddy water descending to the gap flows down along the inclined slit. The water flowing toward the center of the working machine is generated in the muddy water by the flow along the slanted slit of the muddy water.

  Here, for example, when the entire scattering prevention cover is divided into a plurality of cover elements in the length direction (the width direction of the working machine) as in Patent Document 1 described above (Claim 2 of Patent Document 1), Since adjacent cover elements are merely separated by a cut, there is no effect of collecting muddy water flowing down the back of the cover element. Moreover, even if the cut is formed in a slit shape, if the cut is facing the vertical direction on the elevation without tilting, the muddy water that has collided with the back of the cover element (mudguard material) It cannot be guided in any direction in the width direction.

  On the other hand, in the present invention, the longitudinal direction of the mudguard material is formed by a plurality of divided receiving pieces, and between the adjacent receiving pieces, from the upper side to the lower side, from both sides in the width direction of the work machine to the central portion side. By providing a sloped gap, it is lifted up by the tilling rotor, collides with the inner peripheral surface of the shield cover and diffuses (disperses), and then passes through the inner peripheral surface on the front side of the shield cover, and a mudguard (receiving piece) It is possible to guide the muddy water descending along the gap into the gap. Furthermore, it is possible to drop to the lower end of the mudguard material (receiving piece) along the inclination.

  By inclining the gap from the upper side to the lower side from both sides in the width direction of the work equipment toward the center side, when the muddy water in a lump state falls or falls along the gap, the muddy water fills the gap. Will flow down. At this time, since the gap is inclined downward from both sides in the width direction of the work machine to the center side, the muddy water falls at a speed from both sides of the work machine in the width direction toward the center part. The muddy water that flows down along the line is always sent to the center of the machine. It is considered that the muddy water feeding effect due to the gap is related to the rotation speed of the tilling rotor, the traveling speed of the work implement, the pitch of the tilling claws in the axial direction of the tilling rotor, and other conditions. The number of gaps is appropriately set according to the pitch of the tilling nail and the like.

  For example, in situations where there is a large amount of muddy water that is picked up by tillage claws (which is raked once per rotation and is intermittently generated), such as in situations where the water depth is large (the water level is high) The muddy water flows into the gap, and the surface tension generated between the downward and upward faces causes the muddy water to flow along the gap while being filled in the gap. The tendency to generate a strong water flow is increasing.

  Conversely, when the amount of muddy water descending from the shield cover to the mudguard is small, most of the muddy water flows along the downward surface located above the gap due to viscosity, of the downward and upward surfaces facing the gap. Tend to. For this reason, the amount of muddy water that reaches (falls) to the upward surface and flows down is small, and although the water force is lower than when the amount of muddy water is large, a water flow toward the center side is generated along the gap.

  Since the gap formed in the mudguard is an air gap, it has inner surfaces facing each other (upward surface and downward surface), but if there is a large amount of muddy water descending to the back of the mudguard, it falls from above, Alternatively, the falling water flows down along the gap in a state where the muddy water is filled and held in the gap by the surface tension generated between the inner peripheral surfaces constituting the gap (the mud stretches a film in the gap). At this time, both inner peripheral surfaces of the gap function to give the muddy water a speed toward the center of the work machine. The amount of muddy water picked up by the tilling claws during work varies depending on the situation, and during actual work, the time during which muddy water flows down along the downward surface is longer. Since the water flow toward the center side along the gap is generated also by flowing down along the gap, the gap exerts a function to give a speed to the muddy water.

  The muddy water that flows down from the gap is sent closer to the center of the work machine, so that it is possible to generate a flow from the both sides in the width direction of the work machine toward the central part on the surface of the muddy water that exists in front of the work machine. As a matter of course, the floating material such as dredging floating on the muddy water existing in front of the work equipment is naturally guided to the work equipment side (to be kept on the spot or not to flow outside the work width (work machine width)). Is realized).

  When the floating material is guided to the work machine side and taken into the shield cover, the floating material is caught in the tilling rotor and embedded (mud) in the mud. Since the suspended matter is embedded in the mud, the entrapment in the seedling due to the floating matter floating at the time of rice planting is eliminated, and the influence of the suspended matter on the seedling and the planting operation are avoided.

The mudguard material alone is attached to the rear part of the tractor, and is connected to the shield cover of the scraper working machine including the tilling rotor that rotates around the horizontal axis by receiving the power from the tractor and the shield cover that covers the top,
It has a plurality of receiving pieces divided in the longitudinal direction, and is arranged between adjacent receiving pieces with an inclined gap from one side to the other side in the length direction from the upper side to the lower side. It is set as a constituent requirement (claim 6).

  Here, “one side in the length direction” corresponds to “both sides in the width direction of the cutting work machine” in claim 1, and “the other side in the length direction” in “width direction center part side of the cutting work machine” in claim 1. ". “One side in the length direction” and “the other side” mean that a single mudguard or a single receiving piece can be used with the front side and the back side reversed. If two mudguards or receiving pieces of the same shape and the same dimensions are arranged symmetrically with respect to the center in the width direction of the scraping work machine, the gap will be “from the top to the bottom in the width direction from both sides to the center. By satisfying the requirement of “inclined to the side” (claim 1).

  In some cases, the mudguard material may have a length extending over the entire width (full length) of the shield cover with a plurality of receiving pieces in the width direction of the work machine, or a plurality of pieces (for example, four pieces) as shown in FIGS. There is a case where the length of the shield cover is extended over the entire width by arranging one set and arranging a plurality of sets continuously or intermittently. In the case where the mudguards are arranged intermittently, the mudguards adjacent to each other are arranged at intervals such that mud water is not discharged from the gap between them to the surface side of the mudguard. It is arbitrary how many pieces of mudguard material are formed.

  When the mudguards are arranged over the entire width of the shield cover, there is no gap between adjacent mudguards, so that the effect of preventing muddy water and the like is prevented. However, in the portion directly behind the tractor having a three-point link or the like, muddy water is blocked by these members, so there is little influence even if there is no mudguard.

  After all, it is preferable that the mudguard material for the purpose of preventing muddy water scattering on the tractor is disposed over the entire portion except the portion directly behind the tractor. It is desirable that the gap between each mudguard material is formed in the entire width direction of the mudguard material, but if it is formed at least in the regions on both sides in the width direction, the effect of guiding mud water or suspended matter to the center side of the work equipment Is expected, so both sides are sufficient.

  The mudguard is connected to the shield cover in the height direction of the working machine, and in principle, has a height at which the lower end or the lowermost end contacts the muddy water surface or is immersed in the muddy water during work.

  In the longitudinal direction of the mudguard, a plurality of receiving pieces are arranged with a gap therebetween, so that at least one gap is formed in the mudguard. In order to exhibit the effect that the gap guides mud water or the like to the center side of the work machine, a plurality of gaps may exist as a whole work machine on which the mudguard is attached.

  The mudguard material is provided with a plurality of receiving pieces with a gap in the longitudinal direction thereof, and the plurality of receiving pieces are gathered to basically form a warm shape as shown in FIG.

  When multiple mudguards are mounted in the width direction of the shield cover, the mudguards are mounted on the shield cover in a line-symmetrical or plane-symmetrical state with respect to the center in the width direction as shown in FIGS. The When a set of mudguards has a length over the entire width of the work implement, a plurality of gaps are formed symmetrically with respect to the longitudinal center of the mudguard.

  When the lower end of the mudguard is horizontal as shown in FIG. 10, the lower end of the mudguard itself does not act positively to generate a flow in the mud, but for example as shown in FIG. 11- (a) If the lower end of each receiving piece is inclined from the lower side to the upper side from the both sides in the width direction of the work machine to the upper side (Claim 2), the lower end portion of the mudguard material is immersed in the muddy water. -In (b), it is possible to give the function of moving the muddy water present in front of the mudguard from the both sides in the width direction of the work implement to the center side.

  When the muddy water present in front of the mudguard is about to be pushed forward by the lower end of each receiving piece, the muddy water is immersed in the muddy water because of the resistance that the muddy water receives from the muddy water of the receiving piece. Because the resistance received by the muddy water is small, the muddy water tends to go to the side where the resistance from the receiving piece is small. As a result, the muddy water present in front of the mudguard material generates a water flow that moves from both sides in the width direction of the work machine with high resistance to the central part with low resistance as indicated by arrows at the lower end of each receiving piece. It will be promoted that an object will be guide | induced to the working machine side and will be embedded in mud by a tilling rotor.

  Trying to go to the side where the resistance from the receiving piece is small is also applicable to the suspended matter blocked by the mudguard material, so that the suspended matter is guided to the center in the width direction of the work machine by riding on the water flow generated in the muddy water. In addition to this, it is also guided directly to the center side in the work machine width direction.

  Further, as shown in FIGS. 11- (b) and (c), the bottom surface (downward surface) of the mudguard material (receiving piece) with the slope shown in FIG. 11- (a) is the surface from the back side of the mudguard material. If an inclination is applied from the lower side to the upper side toward the side, the effect of inducing muddy water that collides with the lower end surface of the mudguard material to the center side of the work implement in the range of the thickness of the mudguard material is enhanced. In FIG. 11- (c), the right side is the front side of the mudguard.

  In this case, when the muddy water present in front of the mudguard material shown in FIG. 11 is to be pushed forward from the lower end portion of the mudguard material to the front side in the traveling direction, resistance is also obtained as indicated by an arrow at the lower end surface of each receiving piece. Since the water flow which moves to the center part side where resistance is small from the both sides of the width direction of the large work implement is generated, the effect of guiding the muddy water and suspended matter to the center part side of the work implement width direction is enhanced.

  In the case of FIG. 11, since the lower end portion of each receiving piece is inclined, the end portion on the both sides in the width direction of the work implement becomes the lowest end level among the lower end portions. When the lower end is immersed in the muddy water surface (the level shown in FIG. 8 (b)), a gap is formed between the lower end near the center in the width direction of the work implement and the water surface due to the inclination of the lower end. For this reason, suspended matter is easily taken into the shield cover from the gap due to the water flow generated by the lower end.

  The mudguard material in the scraping work machine according to claim 2 is a single unit, and the lower end portion of each receiving piece is provided with an inclination from the lower side to the upper side from the lower side to the upper side. It is set as a constituent requirement (claim 7). Here, “the length direction” means “the length direction” in claim 6, and “the length direction one side” and “the length direction other side” are “the width of the cutting work machine” in claim 1, respectively. Corresponding to both sides in the direction and the center side in the width direction of the scraping work machine, the single side of the mudguard material can be used by reversing the front side and back side of the length direction on one side and the other side It means that.

  Since the muddy water present in front of the mudguard material is pushed out by the front surface of the mudguard material during work, the surface of each receiving piece is inclined from the front to the rear from both sides in the width direction of the work implement to the center side. If it is (Claim 3), it is possible to generate the water flow which moves the muddy water which the front side near the lower end part of the mudguard material exists in front of the mudguard from the both sides in the width direction of the work implement.

  In Claim 3, as shown in FIG. 12- (c), the surface of each receiving piece is inclined from the front to the rear from both sides in the width direction of the work machine to the center. In this case, a muddy water that exists in front of the mudguard material is moved along the surface of each receiving piece to the side of the gap having a small resistance, and is indicated by an arrow as in the case of FIG. In this way, a water flow is generated in which the muddy water present in front of the mudguard material moves toward the center of the work implement, and the suspended matter is guided into the shield cover.

  Of the upward and downward surfaces constituting the gap, as shown in FIG. 12- (d), the upward surface in the vicinity of the opening at the lower end of the gap is relatively downward with respect to the downward surface, and the rear surface (rear surface) side of the mudguard is relative to the downward surface. By positioning it (Claim 4), it is possible to suppress the flow to the both sides in the width direction of the work implement. Specifically, this means that each receiving piece constituting the mudguard material is twisted to the rear side around the axis in the width direction (height direction) of the mudguard material, and the receiving piece is received. It can be obtained by bending or bending the piece, or by twisting the portion of each receiving piece closer to the center of the work machine toward the back side of the mudguard. The twisting amount is limited to such an extent that the effect of generating a water flow on the muddy water by the gap 1d is not hindered.

  When the mudguard has the form shown in FIG. 12- (d), when the torsion part at the lower end of the mudguard is immersed in the mud as shown in FIG. Because it is located on the front side from the upward surface, it is located in front of the mudguard material than when it is located on the back side. It becomes easy to go around to the back side of the receiving piece located near. As a result, it becomes easy to guide the muddy water existing in front of the mudguard material from the gap to the back side of the mudguard material, and it is possible to generate a water flow in the muddy water from both sides of the work implement toward the center side.

  The mudguard material in the scraping work machine according to claim 3 is a single piece, and the surface of each receiving piece is inclined from the one side in the length direction to the other side from the front to the rear of the cutting work machine. (Claim 8). Here, “the length direction” also means “the length direction” in claim 6, and “the length direction one side” and “the length direction other side” are respectively “the width of the chamfering work machine” in claim 1. Corresponding to the “direction both sides” and “the central side in the width direction of the skimming machine”.

  Since the receiving piece can be worn or damaged by continuous use, in principle, it is detachably connected to the shield cover. The receiving piece has a connecting portion 1a connected to the front surface portion (the hanging portion 2b in the embodiment) located on the upper side (near the upper end portion in the width direction) of the shield cover in the traveling direction, so that each receiving piece 1e is It is mounted on the work machine while maintaining a state in which it can move independently (FIG. 8). In this case, it does not matter whether it is detachable. The receiving piece having the connecting portion 1a on the upper side becomes a part of the shield cover by being connected to the front portion of the shield cover at the connecting portion 1a. In this case, as compared with a mudguard material in which a plurality of receiving pieces are connected, only the worn or damaged receiving pieces can be replaced, so that the repair cost can be reduced.

  When the mudguard material is viewed in a longitudinal section, the shield cover in a state where the mudguard material is inclined from the front side to the rear side in the traveling direction of the work machine from the upper side (connecting portion) to the lower side (receiving piece) as shown in FIG. In the case where it is connected to the surface (Claim 5), it is present in front of the mudguard material, so that suspended matter and mud water that collide with the front surface of the mudguard material are guided to the lower side of the mudguard material along the inclined front surface. The effect of taking in floating matter and the like into the shield cover is exhibited.

  In this case, since the back surface of the mudguard material is inclined from the front side to the rear side in the traveling direction, it becomes easy to take in the muddy water flowing down the back surface of the mudguard material. The inclination from the connecting part to the receiving piece is usually formed by connecting the shield body to the shield cover in an inclined state, but if it does not hinder the effect of water flow generation on the muddy water due to the gap, 9, the mudguard itself may be curved or bent around the longitudinal axis of the mudguard from the front side to the back side.

  When the surface of the mudguard material is inclined and connected to the shield cover, the mudguard material (receiving piece) can flow the muddy water that collides with the front surface of the mudguard material to the lower side. There is no hindrance to the generation of water flow to the center of the mud working machine by the lower end or front of the piece. In particular, when the lower end portion of the receiving piece is inclined upward from both sides of the work machine to the center side (Claim 2), when the mudguard material itself is inclined, it collides with the front surface of the receiving piece. Thus, the muddy water flowing downward can be taken under the lower end surface. As a result, the muddy water flowing downward from the front surface of the receiving piece can be placed on the muddy water flowing from the lower end surface of the piece toward the center of the work machine. The effect of taking in is easily demonstrated.

  It has a receiving piece divided into a plurality in the longitudinal direction, and is arranged with a gap between the adjacent receiving pieces with an inclination from the upper side to the lower side toward the central part from both sides in the width direction of the scraping work machine. Since the mudguard material to be connected is connected to the front side of the shield cover in the traveling direction, the tilling rotor scoops up, most of the muddy water colliding with the back of the receiving piece can be concentrated in the gap and lowered to the lower end of the receiving piece .

As a result, of the muddy water that collided with the back of the receiving piece, the muddy water that collided with the area above the gap is lowered to the gap along the back of the piece, and along the slope of the gap, the center of the work machine from both sides in the width direction It can be made to flow down to the part side, and the water flow toward the center part side of the working machine can be generated in the muddy water by the flow down along the gap.

It is the front view by the side of the tractor which showed the scraping work machine which connected two sets of mudguards which have four independent receiving pieces in the position near the both sides of the width direction ahead of a shield cover. (A), (b) is an arrow XX view of FIG. 1, (a) shows the state of a normal water level, (b) shows the state where the water level is rising from (a). . It is the front view by the side of the tractor which showed a mode that the mudguard material was connected to the shield cover front, when an extension work machine was connected with the work machine body. It is the side view which showed a mode that the extension working machine in the alternative working machine shown in FIG. 3 was folded and stored. FIG. 5 is an enlarged cross-sectional view of the shield cover of FIGS. 2 and 4. It is the top view which showed the mode at the time of the operation | work by the scraper shown in FIG. It is the perspective view which showed a mode that the plowing work machine shown in FIG. 3 is working in the farm field with muddy water. (A), (b) is the elevation which showed the flow of the muddy water in the gap | interval of the mudguard in the state shown in FIG. 7, and respond | corresponds to FIG. 2- (a), (b), respectively. (A), (b) is a connection example other than FIG. 5 to the shield cover of a mudguard, (a) is a longitudinal cross-sectional view when the mudguard is bent, and (b) is curved. . It is the elevation which showed the surface of the basic mudguard. (A) is an elevation view showing a production example of a mudguard material when the lower end portion of the receiving piece is inclined, and (b) is an illustration of the mudguard material on the lower end surface of the receiving piece with the inclination shown in (a). The elevation which showed the mudguard material at the time of attaching the inclination which goes upwards from the back to the surface side from the back side, (c) is xx sectional view taken on the line of (b). (A) is an elevation view showing the surface of the mudguard material when a portion on the upward surface side facing the gap between the receiving pieces is deformed to the back side, and (b) is a sectional view taken along the line yy of (a). (C) is the horizontal sectional view which showed the modification of (b). (A) is a front view of the pressing member having an upward inclined slit at the lower end, and (b) is a front view when the receiving pieces are gathered together by the pressing member of (a).

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

1 includes a tilling rotor 6 that is mounted on the rear portion of the tractor 20 shown in FIG. 6 and that rotates around a horizontal axis by receiving power from the tractor 20 and a shield cover 2 that covers the top thereof. A scraping work machine (hereinafter referred to as a work machine) 10 is connected to a mudguard 1 in which a plurality of receiving pieces 1e divided in the longitudinal direction are arranged with an inclined gap 1d on the front side.
The mudguard 1 has a receiving piece 1e divided into a plurality in the longitudinal direction, and between the adjacent receiving pieces 1e and 1e, from the upper side to the lower side, from both sides in the width direction of the work machine 10 toward the central part side. An inclined gap 1d is opened.

  As shown in FIGS. 1 and 2, the main body 10A of the work machine 10 includes a top mast 11 connected to a three-point link hitch mechanism including a top link and a lower link at the rear of the tractor 20, and a lower link connecting portion 12. It is attached to the rear part of the tractor 20 via a three-point link hitch mechanism so as to be able to be raised and lowered. A gear box 13 connected to the PTO output shaft of the tractor 20 via a joint shaft having a universal joint, a transmission shaft, and the like is disposed at the lower end portion of the top mast 11, and is transmitted from the gear box 13 in the width direction of the main body 10A. A frame 14 and a support frame 15 are installed. The power from the PTO output shaft is transmitted to the PIC input shaft 13 a of the gear box 13, and the power received by the PIC input shaft 13 a is transmitted to the transmission shaft inserted through the transmission frame 14.

  A chain transmission case 16 is fixed to the distal end portion of the transmission frame 14 so as to hang down, and an end cover 17 facing the chain transmission case 16 is fixed to the distal end of the support frame 15. A rotary shaft 7 of the tilling rotor 6 is installed between the transmission case 14 and the end cover 17 so as to be rotatable about the axis. A chain is stretched between the chain transmission case 16 and the rotary shaft 7, and the power of the transmission shaft is transmitted to the rotary shaft 7 through the chain. The shield cover 2 is joined to the chain transmission case 16 and the end cover 17 at end plates 21 and 21 at both ends thereof.

  A tilling claw 8 protrudes from the outer periphery of the rotary shaft 7 at an appropriate interval in the circumferential direction, and the tilling rotor 6 is constituted by the rotary shaft 7 and the tilling claw 8. The tilling claws 8 are arranged in the axial direction of the rotary shaft 7 with an interval that does not interfere with each other. The tilling claws 8, 8 adjacent to each other in the axial direction of the rotary shaft 7 are arranged at an angle with respect to the center of the shaft, for example, and the tip of the tilling claws 8 in FIG. 2, FIG. 4 and FIG. Draw a rotation trajectory indicated by a two-dot chain line. Fig. 2- (a) shows the situation of normal water level, and Fig. 2- (b) shows the situation of higher water level than Fig. 2- (a). 8- (a) and (b) show the front of the shield cover 2 corresponding to FIGS. 2- (a) and (b).

  Under the transmission frame 14 and the support frame 15, a shield cover 2 that covers the rotation range of the tillage claw 8 and protects the main body 10 </ b> A of the work machine 10 from earth and sand is disposed. As shown in FIG. 1, the shield cover 2 is joined to lower brackets 14 a and 15 a protruding below the transmission frame 14 and the support frame 15 in a connecting member 2 a protruding from the upper surface (outer peripheral surface) thereof. Is supported by both frames 14 and 15.

  The two-dot chain line just below the lower end of the rotary shaft 7 in FIG. 2- (a) and the two-dot chain line passing through the rotary shaft 7 in FIG. 2- (b) indicate the level of the mud surface of the field. It changes according to the change of the depth of the mud surface. 1 and 8 show an example in which the lower end portion of each receiving piece 1e constituting the mudguard 1 is inclined upward from both sides of the work machine 10 to the center side. Under the normal water level situation shown in FIG. 2- (a), the level of the muddy water surface is not immersed in the muddy water as shown in FIG. 8- (a). Under the high water level situation shown in b), about half of the lower end of each receiving piece 1e is immersed in the muddy water as shown in FIG. 8- (b).

  In the situation of the water level shown in FIGS. 2- (a) and 8- (a), the mudguard 1 receives mainly mud water scraped by the tilling claws 8 from the inside of the shield cover 2 at the back, and the mudguard 1 through the gap 1d. After being guided to the lower end portion of the working machine 10, it works to guide to the central portion side of the work machine 10. In the situation of the water level shown in FIGS. 2B and 8B, the mudguard 1 in addition to guiding the mud water scraped by the tilling claws 8 to the lower end through the gap 1d, the front of the mudguard 1 It receives the muddy water and suspended solids present at the lower end of the piece 1e and guides it toward the center of the work machine 10.

  As shown in FIG. 2- (a), the floating material easily enters the shield cover 2 under the condition that there is a gap between the lower end of the receiving piece 1e and the water surface, but the length direction of the mudguard 1 is the gap 1d. By being divided into a plurality of receiving pieces 1e with a gap, each receiving piece 1e is easily bent and deformed compared to the case where each receiving piece 1e is not divided (integrated formation) (the degree of freedom of deformation is large). Therefore, even under the situation shown in FIG. 2- (b), the effect of taking the floating substance into the shield cover 2 is maintained. Even when the receiving piece 1e is elastically deformed due to resistance from a suspended matter or the like, the receiving piece 1e can be restored immediately, so there is no influence on the effect of inducing muddy water due to the temporary increase in the gap 1d.

  3 and 4 show a state in which the mudguard 1 is connected to the main body 10A and the extension work machine 30 when the extension work machine 30 is foldably connected to both sides in the width direction of the main body 10A. 3 shows a state in which the extension work machine 30 is deployed, and FIG. 4 shows a state in which the extension work machine 30 is stored.

  As shown in FIG. 4, the extension work machine 30 has a tilling rotor 34 that rotates simultaneously with the tilling rotor 6 when deployed, a shield cover 31 that covers the top, and end plates 32 that are positioned on both sides of the shield cover 31 in the width direction. The plate 32 is connected to the end plate 21 of the main body 10A in a state where the plate 32 can be unfolded and folded. For example, as shown in FIG. 4, the extension work machine 30 is connected to the main body 10 </ b> A so as to be rotatable around an axis inclined in the vertical direction with respect to the traveling direction. The tilling rotor 34 of the extension work machine 30 receives power from the tilling rotor 6 by being connected to the rotary shaft 7 of the tilling rotor 6 of the main body 10A via a clutch during deployment.

  The extension work machine 30 is connected by a pin 23 or the like to a bracket 22 protruding from the upper side of the end plate 21 in the main body 10A at a position closer to the rear side of the end plate 32 in the bracket 33 protruding from the upper side of the end plate 32. As a result, it is connected in a state where it can be expanded and retracted. The extended state and the retracted state of the extension work machine 30 are restrained by the restraining device 35 that holds the respective states. FIG. 6 shows the working state of the work machine 10 in the expanded state of the extension work machine 30.

  As shown in FIG. 6, a leveling plate 40 for leveling the mud surface of the farm is connected to the rear of the main body 10 </ b> A, but is connected to the leveling plate 40 of the main body 10 </ b> A in its unfolded state behind the extension work machine 30. The resulting leveling plate 41 is connected. In FIG. 6, an auxiliary leveling plate 42 is connected to the outside of the leveling plate 41 of the extension work machine 30 in the direction of the width of the work machine 10 to push muddy water and dredged material existing behind the work machine 10 toward the center in the width direction. doing.

  As shown in FIGS. 1 and 2, the mudguard 1 having four independent receiving pieces 1e is connected at the upper end to a mounting plate 3 that faces the front side in the traveling direction of the shield cover 2, specifically, the front side. Thus, the shield cover 2 is attached in a suspended state. The shield cover 2 has a cross-sectional shape surrounding the tilling rotor 6, a front part located near the front of the tilling rotor 6, an intermediate part located above the tilling rotor 6, and a rear located near the rear of the tilling rotor 6. Divided into parts.

  In the drawing, as shown in FIG. 5, which is an enlarged view of FIG. 2, a drooping portion 2b is formed at the front end position of the front portion, and a mounting plate 3 is detachably disposed with respect to the drooping portion 2b. Together with the material 1, the mudguard 1 can be cleaned and replaced by detachably connecting to the hanging portion 2 b by a fastener 4 such as a bolt or a pin. An insertion hole is formed in a portion through which the hanging portion 2b, the mounting plate 3, and the fastener 4 of the mudguard 1 pass. In FIG. 10 etc., the insertion hole of the mudguard 1 is shown by 1b.

  Each receiving piece 1e (the mudguard 1) may be directly joined by the fastener 4 in contact with the surface of the mounting plate 3, but in the drawing, the binding force of each receiving piece 1e by the fastener 4 is From a flat bar or the like having a length equivalent to that of the mudguard 1 (the connecting portion thereof) between the fastening material 4 on the surface side of each receiving piece 1e so as to act equally in the length direction of the mudguard 1 The presser material 5 is interposed. The mudguard 1 (each receiving piece 1e, the same applies hereinafter) is also connected to the shield cover 31 of the extension work machine 30 via the mounting plate 3 or the fastener 4 via the mounting plate 3 and the pressing member 5. Is done. In this case, an insertion hole through which the fastener 4 is inserted is also formed in the pressing member 5.

  In the drawing, in particular, the mounting plate 3 is formed in an L-shaped cross-sectional shape, so that the mudguard 1 overlaps with the hanging portion 2b of the shield cover 2 and receives the supporting portion 3a in a state where the mudguard 1 overlaps with the supporting portion 3a. It is composed of two parts of the contact part 3b that is bent and the tip contacts (contacts) the surface of the front part of the shield cover 2, and when the mudguard 1 is connected to the shield cover 2, the mudguard 1 is placed on the vertical surface. The shield cover 2 is connected to the shield cover 2 at a fixed angle.

  FIG. 5 shows a state in which the working machine 10 is inclined from the front side to the rear side in the traveling direction from the upper side to the lower side so that the muddy water received by the surface (front surface) of the mudguard 1 can be guided downward. The state where the mudguard 1 is connected is shown. Since the back surface of the mudguard material 1 is inclined from the front side to the rear side in the traveling direction, the mud water flowing down the back surface of the mudguard material 1 can be easily taken into the gap 1d. Guiding the mud water received by the surface of the mudguard 1 is to bend the mudguard 1 itself from the front side to the back side as shown in FIG. 9- (a), or as shown in FIG. 9- (b). It is also possible to bend it. Note that, as described above, the degree of bending or bending of the portion to be bent or bent is set to such an extent that the effect of generating water flow on the muddy water by the gap 1d is not hindered.

  9- (a) and (b), the lower part in the height direction of the mudguard 2 is bent or curved from the surface side to the rear side, so that the mud received on the surface of the mudguard 1 is forward in the traveling direction. Without being pushed out, it is possible to guide to the rear side. When the lower part of the mudguard 1 is curved as shown in FIG. 9- (b), the speed of the mud water contacting the surface of the mudguard 1 is higher than that of the planar shape shown in FIG. 9- (a). Since it decreases as it goes backward, it is considered that the backward guiding effect is high. In the case of FIG. 9- (b), the effect of taking in floating matter existing in front of the mudguard 1 to the back side (inside the shield cover 2) of the mudguard 1 is also high.

  The mudguard 1 is basically on the front side of the shield cover 2 as shown in FIG. 8 which is an enlarged view of both sides in the width direction of the work machine 10 in FIG. 1 and FIG. 10 which is a simple example of a basic shape. It is divided in the height direction (width direction) into a connecting portion 1a connected to the hanging portion 2b and a mud receiving portion 1c that continues to the connecting portion 1a and hangs downward. The connecting portion 1a is formed with an insertion hole 1b through which the fastener 4 is inserted for connection to the hanging portion 2b of the shield cover 2.

  The mud receiving portion 1c is formed from a plurality of receiving pieces 1e arranged with a gap 1d. The gap 1d does not need to be linear, and may be formed in a curved shape. In order to exhibit the effect of guiding mud water or the like to the central portion side of the work machine 10 by having a plurality of gaps 1d, it is appropriate to be attached to one mudguard 1 and to be formed from a plurality of receiving pieces 1e. It is. Accordingly, the number of receiving pieces 1e is not limited.

  The mudguard 1 may be disposed over the entire length of the shield cover 2, but the mud water existing in front of the shield cover 2 is shielded while retaining the mud and mud scraped by the tiller rotor 6 inside the shield cover 2. 2, it is not always necessary to be disposed in the entire length, as long as it can be guided into the interior of the shield cover 2.

  When the muddy water descending along the back surface of the mudguard 1 flows down through the gap 1d, the gap 1d is sent to the center of the work machine 10 so that the muddy water is moved to the muddy water surface in front of the work machine 10. A flow is generated from both sides in the width direction of the machine 10 toward the center side. As shown in FIGS. 1 and 10, the width of the work implement 10 extends from the top to the bottom so that the muddy water flows from the gap 1 d at a speed from the both sides in the width direction of the work implement 10 toward the center. Inclinations are applied from both sides in the direction toward the center.

  FIG. 10 shows that “having the receiving piece 1e divided into a plurality in the longitudinal direction, the inclination between the adjacent receiving pieces 1e and 1e from the upper side to the lower side toward the central part side from both sides in the width direction of the work machine 10 The most basic form of the mudguard 1 having the requirement of “arranged with a gap 1d attached” is shown.

  When the mudguard 1 is viewed from the surface side, the inclination angle of the gap 1d with respect to the vertical is arbitrarily set according to conditions such as the traveling speed of the work machine 10, that is, the tractor 20, the width and height of the gap 1d, and the water depth. From the experimental results, the inclination angle of the gap 1d with respect to the vertical is preferably about 60 to 80 °, and is about 75 ° in FIGS. The width of the gap 1d (the horizontal width or the distance between the upward surface and the downward surface) is set in the range of about 3 to 15 mm, preferably about 5 to 10 mm. The thickness of the mudguard 1 (receiving piece 1e) itself varies depending on the function (performance) required for the mudguard 1, and depends on the material (raw material) for exhibiting the bending rigidity corresponding to the function. For example, in the case of synthetic resin or rubber, the thickness is about 1.5 to 2.5 mm.

  Most of the muddy water descending along the back surface of the mudguard 1 falls down along the gap 1d after reaching the gap 1d. Since the muddy water descending along the gap 1d has a speed that is along the slope of the gap 1d and is directed toward the center of the work implement 10, the muddy water present in the vicinity of the mudguard 1 is directed toward the center of the work implement 10 Is generated.

  FIG. 7 shows a state where the working machine 10 in which the mudguard 1 is connected to the hanging part 2b in front of the shield cover 2 is actually working in the field where mud is stored on the mud. FIG. 8 shows a state in which the muddy water descending along the gap 1d moves at a speed facing the center side of the work machine 10. The two-dot chain line in FIGS. 8- (a) and (b) shows the level of the muddy water surface.

  1 and 8, in particular, the receiving piece 1e divided into a plurality of pieces with a gap 1d having an inclination from the both sides in the width direction of the work machine 10 toward the center side from above to below is arranged. In addition to the requirement, the mudguard 1 having the requirement that "the lower end of each receiving piece 1e is inclined from the lower side to the upper side from both sides in the width direction of the work machine 10 to the central side" The form is shown. When the lower end portion of the receiving piece 1e is inclined as described above, the receiving piece is under a water level situation in which there is a gap between the lower end portion of the receiving piece 1e and the muddy water surface as shown in FIG. The floating matter such as rice stock that collided with the lower end of 1e tends to flow into the center of the work implement 10 having a large distance from the muddy water surface to the lower end of the receiving piece 1e. The effect of guiding to the center side is expected.

  In a situation where the level of the muddy water surface is at the level of the center in the width direction of the lower end of each receiving piece 1e as shown in FIG. 8- (b), the lower end of the receiving piece 1e is immersed in (contacts) the muddy water surface. Thus, since the muddy water is guided from the both sides in the width direction of the work machine 10 to the center side, an effect of generating a water flow directly with respect to the muddy water existing in front of the mudguard 1 is expected.

  When the working machine 10 in which the mudguard 1 is mounted on the shield covers 2 and 31 of the main body 10A and the extension work machine 30 in the state shown in FIG. 3 is actually operated at a speed of about 0.7 m to 1.4 m / sec. (FIG. 7) Due to the muddy water flowing down from the gap 1 d of the mudguard 1, a flow toward the center in the width direction of the shield cover 2 is generated in the muddy water existing in front of the mudguard 1, and in front of the mudguard 1. It is confirmed that the existing muddy water is guided to the central portion side in the width direction of the shield cover 2.

  As described above, the mudguard 1 is divided into the connecting portion 1a and the mud receiving portion 1c in the height direction, and is divided into a plurality of receiving pieces 1e with a gap 1d in the width direction (length direction). . FIG. 10 shows an example of a basic mudguard 1 having a receiving piece 1e divided into a plurality of gaps 1d with an inclination from the upper side to the lower side of the work machine 10 from both sides in the width direction toward the center. FIG. 8 shows an elevation when the mudguard 1 is viewed from the front side (front side in the traveling direction), and the mudguard 1 connected to the right side in the forward direction of the shield cover 2 is shown. Show. Accordingly, in the elevation view, the left side is closer to the width direction end of the work machine 10, and the right side is closer to the center.

  As shown in FIG. 10, the most basic mudguard 1 is divided into a plurality of receiving pieces 1e with a gap 1d inclined from the upper side to the lower side of the work machine 10 from both sides in the width direction to the center side. Therefore, it is not always necessary that the lower end of each receiving piece 1e is inclined with respect to the horizontal as shown in FIGS.

  In each receiving piece 1e divided in the width direction (length direction) by the gap 1d, the lower end portion on the downward surface side of the gap 1d has an arc shape or an elliptical arc as shown in FIGS. 8A and 8B. Since it is formed in a curved shape, the muddy water descending (flowing down) the gap 1d acts so as to wrap around the lower end surface continuous with the downward surface as shown by the arrow. It is easy to shift to the part side.

  Further, in both cases of FIGS. 8A and 8B, the lower end portion of the receiving piece 1e is inclined upward from the both sides in the width direction of the work machine 10 to the center portion side, so that both side portions are curved. The distance between the lower end portion of the receiving piece 1e and the muddy water surface is increased on the central portion side of the work machine 10 together with the formation in the shape. As a result, the floating substance existing on the front side of the mudguard 1 is easily taken into the shield cover 2 on the center side of the work machine 10 in each receiving piece 1e unit. Moreover, when the lower end part of the receiving piece 1e is immersed in muddy water like FIG.8- (b), it is easy to generate the water flow which goes to the center side of the working machine 10 in muddy water near the water surface.

  In the situation of the water level shown in FIG. 8- (a) (FIG. 2- (a)), the muddy water flowing down the gap 1d is indicated by an arrow because there is a distance between the muddy water surface and the lower end of the receiving piece 1e. As shown in the figure, the gap 1d tries to continuously go from the downward surface to the lower end surface. In the situation of the water level shown in FIG. 8- (b) (FIG. 2- (b)), the lower end part of the receiving piece 1e is inclined upward from the both sides in the width direction of the work machine 10 to the center part side, As described above, the muddy water flowing down the gap 1d tends to enter the lower end surface continuous with the downward surface of the gap 1d and easily moves to the center side of the work machine 10, so that the muddy water present in front of the receiving piece 1e The lower end of the receiving piece 1e is guided toward the center of the work machine 10.

  11- (a) is similar to FIGS. 1 and 8, and the receiving piece is divided into a plurality of pieces with a gap 1d having an inclination from the upper side to the lower side and from the both sides in the width direction toward the central portion. The example of manufacture of the mudguard material 1 provided with the requirements for having 1e and the requirements that the lower end part of each receiving piece 1e inclines is shown. The arrows in FIG. 11- (a) indicate that the muddy water present in front of the mudguard 1 collides with the lower end of the mudguard 1, and from the both sides in the width direction of the work machine 10 having high resistance to the central part having low resistance. A moving water flow is generated and muddy water flows toward the center of the work machine 10 in the width direction. The lower end surface of the receiving piece 1e does not need to be a flat surface, and may be a curved surface.

  11- (b) is a cross-sectional view of the xx line, as shown in FIG. 11- (c), the surface from the back side of the mudguard 1 to the inclined lower end surface of each receiving piece 1e of the mudguard 1 An example of forming the receiving piece 1e in the case of obtaining the effect of guiding the muddy water colliding with the lower end surface of the mudguard 1 to the central part side of the work machine 10 by providing an inclination from the lower side to the upper side toward the side will be shown. In this case, if the lower end (lower end surface) of the receiving piece 1e is formed into a cylindrical surface that is concave or convex downward, or an elliptically curved surface that gradually changes in curvature, the work implement 10 can be applied to muddy water. The effect of generating a water flow toward the center side of is increased.

  12- (a) and 12 (b) show that “the surface of each receiving piece 1e arranged with a gap 1d is inclined from the front side to the rear side from both sides in the width direction of the work machine 10 toward the center side. The production example of the mudguard material 1 with the requirement of “being done” is shown. FIG. 12- (c) shows a cross section taken along line yy of FIGS. 12- (a), (b). It does not matter whether the mudguard 1 having the requirement that the surface of the receiving piece 1e is inclined or not has the requirement that the lower end is inclined as shown in FIG. 11, the mudguard 1 is shown in FIG. In the example shown, the surface of the receiving piece 1e may be inclined. FIG. 12- (d) shows a modified example of FIG. 12- (c), in which the upward surface in the vicinity of the lower end of the gap 1d is positioned on the rear surface (back surface) side of the mudguard material relative to the downward surface. Show.

  In the case of FIG. 12, the surface of the receiving piece 1e is inclined by twisting the portion of the receiving piece 1e closer to the center of the work machine 10 toward the back side. In this case, as shown by the arrow, the muddy water present in front of the mudguard 1 is pushed to the surface of the receiving piece 1e, and is guided to the back side of the mudguard 1 from the gap 1d by the inclination of the surface. It will flow toward the center in the width direction. In this case, the surface of the receiving piece 1e does not need to be a flat surface, and may be a curved surface. Also in the example shown in FIG. 12, the deformation amount of torsion is limited to such an extent that the effect of generating a water flow on the muddy water by the gap 1d is not hindered.

  As shown in FIG. 13- (a), the holding plate 5 has inclined slits (notches) 5d that are inclined from the upper side to the lower side and from the both sides in the width direction toward the center side. Sometimes it can be put in. The inclined slit 5d is provided according to the shape of the gap 1d formed between the adjacent receiving pieces 1e and 1e as shown in FIG. 13- (b). The groove width of the inclined slit 5d may be larger than the groove width of the gap 1d. Therefore, when each receiving piece 1e is brought into a collective state by the pressing plate 5 having the inclined slit 5d, the gap 1d is substantially extended in the height direction as compared with the case where the pressing plate 5 without the inclined slit 5d is used. Therefore, the muddy water flowing down along the gap 1d increases, and the falling speed can be further increased. As a result, more mud flowing down along the gap 1d can be sent closer to the center of the work implement.

DESCRIPTION OF SYMBOLS 1 ... Mudguard, 1a ... Connection part, 1b ... Insertion hole, 1c ... Mud receiving part, 1d ... Gap, 1e ... Receiving piece,
2 ... Shield cover, 2a ... Connecting material, 21 ... End plate, 22 ... Bracket, 23 ... Pin, 2b ... Hanging part,
3 ... Mounting plate, 4 ... Fastener, 5 ... Presser, 5d ... Inclined slit (notch),
6 ... Tillage rotor, 7 ... Rotary shaft, 8 ... Nail,
10: Scraping work machine, 10A: Main body, 11: Top mast, 12: Lower link connecting part, 13: Gear box, 13a: Input shaft,
14: Transmission frame, 14a: Lower bracket, 14b: Upper bracket,
15: Support frame, 15a: Lower bracket, 15b: Upper bracket,
16 …… Chain transmission case, 17 …… End cover,
20 …… Tractor,
30 ... Extension work machine, 31 ... Shield cover, 32 ... End plate, 33 ... Bracket, 34 ... Tillage rotor, 35 ... Restraint device.

Claims (8)

In the scraper working machine equipped with a tilling rotor mounted on the rear part of the tractor and rotating around a horizontal axis under the power from the tractor and a shield cover covering the top thereof,
It has a plurality of receiving pieces divided in the longitudinal direction, and is arranged with gaps between the adjacent receiving pieces with an inclination from the upper side to the lower side toward the central part from both sides in the width direction of the scraping work machine. The scraping work machine, wherein the mudguard material to be used is connected to the front side in the traveling direction of the shield cover.   The lower end of each receiving piece of the mudguard is provided with an inclination from the lower side to the upper side from both sides in the width direction to the central side of the scraping work machine. Scratching work machine.   The surface of each receiving piece of the mudguard is provided with an inclination from the front to the rear from both sides in the width direction to the center side of the scraping work machine. 2. A scraping work machine according to 2.   The upside surface and the downside surface constituting the gap of the mudguard material are located on the rear side of the mudguard material relative to the down surface. 3. A scraping work machine according to any one of 3 above.   The said mudguard material is connected to the said shield cover in the state which inclined from the front side to the back side of the advancing direction of the said scraping work machine from upper direction to the downward direction. The scraping work machine described in 1. Attached to the rear part of the tractor, connected to the shield cover of the scraper working machine comprising a tilling rotor that rotates around a horizontal axis in response to power from the tractor and a shield cover that covers the top thereof,
It has a plurality of receiving pieces divided in the longitudinal direction, and is arranged between adjacent receiving pieces with an inclined gap from one side to the other side in the length direction from the upper side to the lower side. A mudguard material for scraping work machines.   The mudguard for a skimming work machine according to claim 6, wherein a slant is provided at the lower end of each receiving piece from the lower side to the upper side from the lower side to the upper side. . The surface of each receiving piece is inclined from the front side to the rear side of the scraping work machine from one side in the length direction to the other side. Mudguard material for scraping work machines described in 1.

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