JP2010178718A - Soil-stickproof member and rotary cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide soil-stickproof members preventing soil-and-sand from intruding between them while preventing soil-and-sand sticking by vibration, and to provide a rotary cover including the same. <P>SOLUTION: The plurality of soil-stickproof members 4 are provided at a shielding cover 2 covering the top of a working rotor 5 supported on the working machine body 10 equipped at the rear of a tractor and traveling together with the tractor. Each of the members 4 is fixed on a position of one side of the circumferential direction of the rotation of the working rotor 5 on the inner side surface of the shielding cover 2; opposite to the fixed side, an abutment portion 41 contacting, in a normal state, with another of the members 4 adjoining the opposite side. Besides, the rotary cover 1 is constructed by such a shielding cover 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides a soil adhesion preventing member comprising a plurality of plate-like members provided on a shield cover that is mounted on a rear portion of a tractor and is supported by a work machine main body that is advanced along with the tractor and covers a work rotor, and the soil adhesion preventing member. This relates to the rotary cover.

  In a rotary working machine including a working rotor in which claws such as a plurality of tilling claws project around a rotary shaft, such as a tilling work machine, the earth and sand that the claws bounce is prevented from reaching the work machine main body, In order to improve tillage performance (especially crushed property), a shield cover is fixed above the working rotor. The shield cover extends in the width direction of the work machine body, and is supported by a transmission frame that transmits power to the rotary shaft and a support frame that is continuous with the transmission frame with the gear box interposed therebetween.

  If the inner peripheral surface of the shield cover directly faces the rotary shaft, the earth and sand will adhere to the inner peripheral surface of the shield cover (the surface on the working rotor side), but the attached earth and sand will resist the resistance of the rotating claw. This causes a problem of lowering work efficiency. Therefore, in order to prevent adhesion and accumulation of earth and sand on the inner peripheral surface of the shield cover, a plate for preventing adhesion of earth and sand may be fixed to the inner peripheral surface of the shield cover (see Patent Documents 1 and 2).

  The adhesion destination of the earth and sand that the claw jumps up with the rotation of the rotary shaft is determined by the direction of rotation of the claw (rotary shaft). For example, the claw rotates from the front to the rear (down cut) with respect to the farm scene. In some cases, the nail scrapes the earth and sand from the front to the rear, so that the earth and sand tends to adhere to the rear side of the shield cover. When the apron is connected to the rear of the shield cover, it is more likely to adhere to the apron.

JP-A-11-9002 (Claim 1, paragraphs 0016 to 0018, FIG. 3) No. 8-3205 (Claim 1, third column, line 12 to fourth column, line 42, FIGS. 1 and 2)

  When a rubber soil adhesion preventing member, for example, is fixed to the inner peripheral surface of the shield cover as in Patent Documents 1 and 2, the earth and sand adhering to the soil adhesion preventing member is adhered to a certain degree due to the vibration of the work machine. You can expect to fall under its own weight. In particular, in Patent Document 2, since one end side of the soil adhesion preventing member is fixed to the shield cover and the other end side is free, it is easy to move up and down due to the influence of vibration during work.

  In addition, when a plurality of soil adhesion preventing members are arranged in the circumferential direction of the shield cover while overlapping the adjacent soil adhesion preventing members as in Patent Document 2, the rotation direction of the rotary shaft is adjusted according to the rotation direction. By allowing one of the soil adhesion preventing members to overlap so as to cover the other from the lower surface side, entry of soil between adjacent soil adhesion preventing members can be prevented to some extent.

  However, when a plurality of soil adhesion preventing members are arranged in an overlapping manner, the earth and sand is likely to enter and accumulate between the soil adhesion preventing members depending on the position at which the soil adhesion preventing member is fixed to the shield cover or depending on the soil properties. Sometimes. This phenomenon is likely to occur in the case of light soil with good drainage and low moisture content.

  When soil starts to accumulate between the soil adhesion prevention member and the shield cover, the soil adhesion prevention member will not function and the soil adhesion prevention member is attached to the shield cover from the work rotor side. Sediment removal is difficult.

  In addition, if both ends of the soil adhesion prevention member are fixed to the shield cover in order to prevent soil from entering between the soil adhesion prevention members, the influence of vibration during operation will be greater than when only one end side is fixed. Since it becomes difficult, there is a possibility that the fall due to its own weight will be reduced.

  In view of the above background, the present invention proposes a soil adhesion preventing member for preventing the entry of earth and sand between the soil adhesion preventing members while preventing the adhesion of the earth and sand by vibration, and a rotary cover provided with the soil adhesion preventing member.

According to a first aspect of the present invention, there is provided a soil adhesion preventing member comprising a plurality of plate-like members provided on a shield cover that covers an upper portion of a work rotor that is attached to a rear portion of a tractor and supported by a work machine main body that travels together with the tractor. An adhesion prevention member, wherein the plate-like member is fixed to the inner side surface of the shield cover at a position on one side in the circumferential direction of the rotation of the work rotor, and adjacent to the side opposite to the fixed side. It is a constituent requirement that an abutting portion that comes into contact with a plate-like member in a natural state is formed.
Moreover, the rotary cover of the rotary working machine of the invention described in claim 2 is provided with the soil adhesion preventing member as a constituent requirement. The rotary cover may refer to the shield cover that covers the upper side of the work rotor, or may include the shield cover and an apron connected to the rear side thereof.

  The soil adhesion preventing member is fixed to a surface on the working rotor side of at least one of the plurality of cover materials at a position on one side in the circumferential direction of the soil adhesion preventing member. When an apron that covers the rear of the work rotor is connected to the rear side of the working machine body in the traveling direction of the shield cover, one or more soil adhesion preventing members are provided on one side in the circumferential direction on the work rotor side surface of the apron. It is fixed at the position. The reason why the soil adhesion preventing member is fixed to the cover material or apron at one position in the circumferential direction is that the earth and sand adhering to the soil adhesion preventing member itself falls due to the vibration of the soil adhesion preventing member due to the vibration of the work machine body. This is for encouraging. The apron is connected to the shield cover so as to freely rotate (open / close) about an axis parallel to the axis of the working rotor.

  When the work rotor (claw) rotates relative to the farm scene from the front in the direction of travel (down cut rotation), the earth and sand tends to adhere to the rear side of the shield cover, and the claw moves from the rear in the direction of travel to the front When rotating upward (up-cut rotation), the earth and sand tends to adhere to the front side of the shield cover.

  From this relationship, when one or more soil adhesion preventing members are fixed to the shield cover, the soil adhesion preventing member located on the upstream side in the rotation direction of the work rotor is connected to the soil adhesion preventing member located on the downstream side. It is reasonable to arrange them in a state of covering from the side.

  Regardless of whether the claw rotates down-cut or up-cut, the soil adhesion prevention member on the upstream side in the rotation direction covers the soil adhesion prevention member on the downstream side from the work rotor side so that it can be seen in the radial direction of the work rotor. In this case, the soil adhesion preventing member located on the work rotor side in the overlapping portion covers the part including the fixed position of the soil adhesion preventing member located on the shield cover side from the work rotor side. That is, since the upstream soil adhesion preventing member covers the fixing position of the downstream soil adhesion preventing member, the downstream soil adhesion preventing member can be protected by the upstream soil adhesion preventing member. It becomes possible to avoid or suppress the adhesion of earth and sand to the fixed position of the earth adhesion preventing member.

  Rubber is suitable for the soil adhesion prevention member from the viewpoint of durability, but basically it has elasticity that can vibrate with the vibration of the work equipment body, and if it has the function of dropping the attached earth and sand, the material will be Regardless, metals, synthetic resins and the like are also used.

  The soil adhesion prevention member fixed to the apron also functions in the same way as the soil adhesion prevention member fixed to the shield cover. When covering up from the work rotor side with the soil adhesion prevention member fixed to the rear side and rotating upcut, the shield cover soil adhesion prevention member covers the apron from the work rotor side. Overlap.

  The entry of the earth and sand between the two soil adhesion preventing members adjacent in the circumferential direction of the shield cover is the soil adhesion preventing member located on the upstream side in the rotation direction of the work rotor, of the two adjacent soil adhesion preventing members. It is possible to prevent by forming the contact part which can contact the soil adhesion prevention member adjacent to the side on the opposite side of the circumferential direction fixed side.

  When there is no contact portion as in Patent Document 2, the soil adhesion preventing member located on the upstream side in the rotational direction tends to hang down from the fixed end side to the free end side, so that the soil adhesion prevention located on the downstream side is prevented. A gap is formed between the inner peripheral surface of the member. However, since the soil adhesion preventing member located on the upstream side has a contact portion that contacts the inner peripheral surface of the downstream soil adhesion preventing member on the free end side, the gap is normally closed. . As a result, since the amount of earth and sand entering between adjacent soil adhesion preventing members is reduced as compared with the case where there is no contact portion, the earth and sand removal work through the opening of the shield cover is reduced.

  Since the soil adhesion preventing member vibrates by itself with the vibration of the work machine body, the contact portion is kept downstream by the vibration of itself while maintaining the state where the contact portion is in contact with the downstream soil adhesion preventing member. It may be separated from the soil adhesion preventing member on the side.

  In such a case, the work implement is obtained by giving the soil adhesion preventing member itself or the contact portion elasticity sufficient to exert a restoring force in a direction in which the contact portion always contacts the downstream soil adhesion prevention member. Regardless of the vibration of the main body, it is possible to always maintain the state where the upstream soil adhesion preventing member is in contact with the downstream soil adhesion preventing member. The contact portion may be made of the same material as the soil adhesion preventing member or a different material. For example, the use of a foamable material for the abutting part, etc., the abutting part contracts, contacts the downstream soil adhesion preventing member, and expands or expands when attempting to separate from the soil adhesion preventing member It is possible to always maintain the contact state even by having

  The shield cover is composed of a plurality of cover materials arranged in the circumferential direction, and an opening for removing earth and sand is formed between any one of the plurality of cover materials adjacent in the circumferential direction. A cleaning tool such as a brush or a hose can be inserted into the inner peripheral side of the shield cover through the opening, or a liquid or gas ejected from the hose or the like can pass therethrough. As a result, even when the soil adhesion preventing member is fixed to the shield cover and the soil is clogged between adjacent soil adhesion preventing members, it can be easily removed from the outside of the shield cover.

It is sectional drawing orthogonal to the rotary axis | shaft in the state with the low level of the apron which showed the relationship between the rotary cover which fixed the several sheet | seat adhesion prevention member to the surface at the side of the work rotor, and the work rotor. It is the perspective view which showed the single body of the shield cover shown in FIG. It is the perspective view which showed the relationship between the shield cover shown in FIG. 1, and an apron. It is sectional drawing orthogonal to the rotary axis | shaft which showed the relationship between a rotary cover (soil adhesion prevention member) and a working rotor when the level of an apron is high. It is sectional drawing orthogonal to the rotary axis | shaft which showed the relationship between the rotary cover (soil adhesion prevention member) and a working rotor when the apron was flipped up. It is the rear view which showed the working machine main body provided with a working rotor. FIG. 7 is a side view of FIG. 6. (A) is the side view which showed the mode when starting the raising of the apron from the state of FIG. 10, (b) is the side view which showed the mode when further raising the apron. (A) is the example formed by bending the contact part of a soil adhesion prevention member. (B) is the example which formed the contact part of the soil adhesion prevention member by bending twice. (C) is the example which formed the contact part of the soil adhesion prevention member 4 as a thick part. (D) is the example which formed the contact part of the soil adhesion prevention member as a hollow part. (E) is the example which formed the contact part of the soil adhesion prevention member by another body. (F) is the example which provided the contact part also in the soil adhesion prevention member located in the most downstream side of rotation of a working rotor.

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

  FIG. 1 shows a soil adhesion preventing member 4 provided on a rotary cover 1 that covers an upper portion of a work rotor 5 that is mounted on a rear portion of a tractor and supported by a work machine body 10 that travels together with the tractor. Is fixed at a position on one side in the circumferential direction of rotation of the work rotor 5, and a contact portion is formed on the other end side so as to cover the fixed position of the adjacent soil adhesion preventing member 4 and contact in a natural state. The structural example of the prevention member 4 is shown.

  As shown in FIGS. 6 and 10, the work machine body 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, and a lower link connecting portion 12. It is attached to the rear part of the tractor via a hitch mechanism so as to be movable up and down. A gear box 13 connected to the PTO shaft of the tractor via a universal joint, a transmission shaft, and the like is disposed at the lower end portion of the top mast 11, and is supported by the transmission frame 14 from the gear box 13 in the width direction of the work machine body 10. A frame 15 is installed. The power from the PTO shaft is transmitted to the input shaft 13 a of the gear box 13, and the power received by the input shaft 13 a is transmitted to the transmission shaft that passes 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. Between the chain transmission case 16 and the end cover 17, the rotary shaft 6 of the work rotor 5 is installed so as to be rotatable about the axis. In the chain transmission case 16, a chain is stretched between the transmission shaft passing through the transmission frame 14 and the rotary shaft 6, and the power of the transmission shaft is transmitted to the rotary shaft 6 through the chain. The shield cover 2 is joined to the chain transmission case 16 and the end cover 17 at end plates 22 and 22 (see FIG. 2) at both ends.

  A claw 7 such as a tilling claw is protruded from the outer periphery of the rotary shaft 6 at an appropriate interval in the circumferential direction. The nail 7 is mainly a nail. However, if it has a function of scooping up soil and sand in a farm scene, the nail 7 includes a nail for a scraper or a drape coater. The claws 7 are arranged in the axial direction of the rotary shaft 6 with an interval that does not interfere with each other. The claws 7 and 7 adjacent to each other in the axial direction of the rotary shaft 6 are arranged at an angle with respect to the center of the shaft, and the tip of the claw 7 forms an arc indicated by a two-dot chain line in FIG. The work rotor 5 is composed of a rotary shaft 6 and a claw 7 projecting from the outer periphery thereof, and the work rotor 5 becomes a tilling rotor.

  Under the transmission frame 14 and the support frame 15, a shield cover 2 that covers the rotation range of the claw 7 of the work rotor 5 and protects the work machine body 10 from earth and sand is disposed. As shown in FIG. 6, the shield cover 2 is joined to lower brackets 14a and 15a protruding below the transmission frame 14 and the support frame 15 in a connecting member 2a protruding on the upper surface (outer peripheral surface) thereof. It is supported by both frames 14 and 15. 10 and 11, reference numeral 20 denotes a gauge wheel for adjusting the depth of the work rotor 5 in operation from the field scene as shown in FIG. 4 by rolling on the field scene.

  On the rear side of the shield cover 2 in the direction of travel of the work machine main body 10, an apron 3 that covers the rear of the work rotor 5 is rotatably connected around an axis parallel to the axis of the transmission frame 14 (a shaft 31 a described later). . A compression rod 18 is connected to the surface side of the apron 3, that is, the surface on the opposite side of the working rotor 5, in order to keep the contact pressure between the apron 3 and the field scene at an appropriate level and to keep the apron 3 flipped up. Is done.

  One end of the compression rod 18, that is, the end (upper end) on the tractor side is rotatably connected to upper brackets 14 b and 15 b fixed on the transmission frame 14 and the support frame 15, and the other end (lower end) is connected to the apron 3. The bracket 3a fixed to the surface is connected in a state in which the position adjustment in the axial direction can be freely performed. The compression rod 18 includes a coil spring 18a or is mounted by winding the outer periphery.

  One end (upper end) of the coil spring 18a is engaged with an axially slidable engaging portion 18b, and the other end (lower end) is movable in the axial direction of the compression rod 18 and can be stopped at an arbitrary position. The coil spring 18a is always in a state where it bears a compressive force while being engaged with the stopper 19. The bracket 19 of the apron 3 is connected to the stopper 19, and the stopper 19 moves along the compression rod 18 as the apron 3 rotates.

  As shown in FIGS. 1 and 4, when the work machine body 10 is operated, the coil spring 18a is locked to the locking portion 18b and the stopped stopper 19, and the locking portion 18b is subjected to the reaction force of the coil spring 18a. Accordingly, the level of the apron 3 is adjusted so that the contact pressure between the apron 3 and the field scene falls within a certain range by sliding in the axial direction. When the apron 3 is flipped up, the stopper 19 is moved to the upper end side of the compression rod 18 and stopped as shown in FIGS. 5, 9, and 11-(b). maintain.

  FIG. 1 shows a state when the working rotor 5 is working when the level of the lowest point through which the claw 7 rotating around the rotary shaft 6 passes and the level of the lower end of the apron 3 are equal or substantially equal. The state at the time of work of the work rotor 5 when the level of the lower end of the apron 3 is located, for example, about 200 mm above the level of the lowest point through which the claw 7 passes is shown. The level of the lower end of the apron 3 can be freely set by adjusting the position of the stopper 19 of the compression rod 18. FIG. 5 shows a state in which the apron 3 is flipped up and stopped in that state. Cleaning of the inner peripheral surface of the shield cover 2 is performed in the state shown in FIG.

  As shown in FIGS. 1 and 2, the shield cover 2 is a plurality of cover members 21 arranged in the circumferential direction of the work rotor 5, and an end plate that is positioned at both ends in the width direction of the cover member 21 and to which the cover member 21 is joined. 22 is comprised. In the drawing, the shield cover 2 is composed of two cover members 21 corresponding to the fact that one soil adhesion preventing member 4 is fixed to each cover member 21, but the number of cover members 21 is arbitrary. Yes, it is not necessarily equal to the number of soil adhesion preventing members 4. For example, the cover material 21 may be composed of one sheet (in this case, an opening 21A described later is not formed), and a plurality of soil adhesion preventing members 4 may be provided on one cover material.

  Of the cover materials 21 and 21 arranged in the circumferential direction, any two adjacent cover materials 21 and 21 are arranged in a state where a space is secured between the opposing ends of the cover materials 21 and 21. An opening 21A for removing earth and sand is formed by the interval between the two. The opening 21A between the cover materials 21 and 21 may be formed continuously over the entire width of the shield cover 2 as shown in FIG. 2, or may be formed intermittently in the width direction.

  As shown in FIG. 2, when the ends of the cover members 21 and 21 are linear, the opening 21 </ b> A is continuously formed over the entire width of the shield cover 2. For example, at least one of the covers When the end portions of the material 21 have pieces that can be connected to each other and are formed in an uneven shape, the opening 21A is intermittently formed in the width direction.

  When removing earth and sand adhering to the inner peripheral surface of the shield cover 2, insert a cleaning tool such as a brush or a hose mainly from the outer peripheral side of the shield cover 2 to drop the earth or sand to the inner peripheral side or to the outer peripheral side. Elimination is performed by discharging. Therefore, when the opening 21A is continuously formed over the entire width of the shield cover 2 as shown in FIG. 2, the removal work is performed while reciprocating in the width direction while the cleaning tool is inserted into the opening 21A. There is an advantage that can be done.

  Even when the opening 21A is formed intermittently, if the length of the opening 21A (the length in the width direction of the shield cover 2) is larger than the width (the width in the circumferential direction of the shield cover 2), cleaning is performed in the opening 21A. Since the tool can be reciprocated, the removal work per opening 21A is good.

  In the drawing, a connecting member 2a for supporting the shield cover 2 on the transmission frame 14 and the support frame 15 is provided in the middle in the width direction of the cover materials 21 adjacent to each other in the circumferential direction. Although the continuously formed opening 21A is discontinuous at the position of the connecting member 2a, workability for reciprocating the cleaning tool in the width direction is ensured. If the connecting material 2a is not projecting, the opening 21A is completely continuous in the width direction.

  In the drawing, one soil adhesion preventing member 4 is fixed to each cover member 21, but a plurality of soil adhesion preventing members 4 may be secured to one cover member 21. Among them, the soil adhesion preventing member 4 may be fixed only to any one of the cover materials 21. In the drawing, the cover material 21 on the outer peripheral surface of the soil adhesion preventive member 4 that is clogged between the soil adhesion preventive members 4 and 4 fixed to each cover material 21 and that is relatively upstream in the rotational direction of the work rotor 5 is shown. In order to facilitate the removal of the earth and sand from the fixed portion, assuming that the earth and sand have entered the fixed portion to the upper side, the upstream soil adhesion preventing member 4 is placed on the rear side in the traveling direction of the shield cover 2. The cover member 21 is positioned near the opening 21A.

  Since the insertion of the cleaning tool into the opening 21A is performed for the purpose of removing soil clogged between the soil adhesion preventing members 4 and 4 fixed adjacent to the inner peripheral surface of the shield cover 2, the opening 21A is It is appropriate to form in a direction along the surface of the soil adhesion preventing member 4 in a fixed state, specifically, in a direction parallel to or close to the portion where the soil adhesion preventing member 4 is secured to the shield cover 2. The fixed portion refers to a portion that is parallel to the inner peripheral surface of the cover material 21 by the fixture 8. Therefore, in FIGS. 1 and 2, the opening 21 </ b> A is cross-sectionally orthogonal to the axis of the work rotor 5, so that the cleaning tool can be inserted along the circumferential direction (tangential direction) of the shield cover 2 with respect to the radial direction of the work rotor 5. It is formed so as to open in an inclined direction.

  Since the shield cover 2 is composed of a plurality of cover members 21 arranged in the circumferential direction, specifically, the opening 21A is formed as shown in FIGS. 1 and 2, or two sheets facing the opening 21A. Of the adjacent cover members 21, 21, at least one of the cover members 21 is bent or curved toward the outer peripheral side of the shield cover 2, so that the opening 21 A is surrounded by the shield cover 2. Oriented along the direction.

  When the end of the cover material 21 on the opening 21A side is not bent or the like, the width of the opening (the width in the circumferential direction of the opening) when the opening 21A is viewed in the circumferential direction (tangential direction) is small, and it is difficult to insert the cleaning tool. However, the end of the cover material 21 on the opening 21A side is bent toward the outer peripheral side, so that the circumferential width (opening width) of the opening when the opening 21A is viewed in the circumferential direction is secured, and cleaning is performed. There is an advantage that it is easy to insert the tool while it is laid down. In this case, the opening width when viewed in the circumferential direction is ensured, but the opening width when viewed in a plan view can be reduced, so that even if the soil adhesion preventing member 4 is damaged, the opening width can be reduced. Since there is almost no soil that comes out directly from the top, there is an advantage that it is possible to avoid the ejection of soil through the opening 21A toward the surface (outer peripheral surface) of the shield cover 2.

  As shown in FIG. 1, when the claw 7 rotates in a down cut direction as indicated by an arrow, the plurality of soil adhesion preventing members 4 are soils on which the soil adhesion preventing members 4 located on the upstream side in the rotation direction are located on the downstream side. The adhesion preventing members 4 are arranged so as to cover from the work rotor 5 side, and each soil adhesion preventing member 4 is fixed to the cover member 21 at a position upstream in the rotation direction in the circumferential direction. In the shield cover 2, the end on the opening 21 </ b> A side of the cover material 21 is bent or the like in accordance with the inclination of the soil adhesion preventing member 4.

  Here, if the end of the cover material 21 located on the downstream side in the rotation direction of the claw 7 of the two cover materials 21 and 21 forming the opening 21A is bent or the like, the cover material 21 located on the upstream side. In the drawing, the end of the cover material 21 positioned on the downstream side is bent to form a bent portion 21b. Yes. In this case, the opening width of the opening 21 </ b> A is not a dimension in the radial direction or the circumferential direction of the work rotor 5, but a dimension in a direction along the inclination of the soil adhesion preventing member 4.

  In the drawing, the front side (downstream side) is formed by bending one steel plate (front plate 21a) or by combining a plurality of bent steel plates (front plate 21a and back plate 21c). The cover material 21 is manufactured. Here, the portion near the end on the opening 21A side of the downstream cover material 21 is bent, and the portion is bent to form the bent portion 21b, thereby ensuring the strength and rigidity of the portion facing the opening 21A. is doing.

  The cover material 21 facing the opening 21A is also the cover material located at the forefront of the shield cover 2 in the drawing, but is located at the forefront on the inner peripheral surface of the front portion of the cover material 21 located at the forefront. A back plate 21c is brought into contact with the soil adhesion preventing member 4 so that the soil adhesion preventing member 4 is inclined. The back plate 21 c also has a role of ensuring the rigidity of the front portion of the cover material 21.

  The back plate 21c also comes into contact with the soil adhesion preventing member 4 and inclines it, so that the inner peripheral surface of the shield cover 2 conforms to a circular locus drawn by the tip of the claw 7 and has a shape close to a curved surface (arc surface). And a plurality of soil adhesion preventing members 4 can be arranged so as to form an arc surface on the cross section of the rotary shaft 6. In this case, since the plurality of soil adhesion preventing members 4 surround the rotating claw 7 within the minimum region, there is an advantage that the range in which the earth and sand scatters to the shield cover 2 side can be minimized. .

  As shown in the figure, when the apron 3 is connected to the rear side of the shield cover 2, there is a gap between the apron 3 and the cover material 21 located on the rearmost side of the shield cover 2. An opening 21B is formed.

  As shown in FIGS. 3 and 6, the apron 3 is connected to the shield cover 2 by a hinge 31 so as to be freely opened and closed, and is pushed up from the rear side of the shield cover 2 as shown in FIG. Therefore, the removal of earth and sand through the opening 21B is performed with the apron 3 flipped up.

  For this reason, it is appropriate that the opening 21B is opened in a direction in which the cleaning tool is inserted and the earth and sand are easily removed when the apron 3 is flipped up to the state shown in FIG. In this relation, the drawing is opened in the radial direction of the working rotor 5 or in a direction close to the working rotor 5 so that the cleaning tool can be inserted deeply without interfering with the apron 3 and the shield cover 2 that are in the flipped state in the drawing. 21B is formed.

  In the drawing, the cover material 21 located at the rearmost side of the shield cover 2 is composed of two bent steel plates (a front plate 21d and a back plate 21e). In this case, since the steel plate (back plate 21e) located on the inner peripheral side of the cover member 21 forms a space on the inner peripheral side of the opening 21B, the opening is made depending on the bending angle of the steel plate (back plate 21e) near the apron 3. The direction of 21B is determined. The opening width of the opening 21 </ b> B in the figure is the width in the circumferential direction of the work rotor 5. The steel plate (back plate 21e) positioned on the inner peripheral side of the cover member 21 is paired with the steel plate (front plate 21d) positioned on the outer peripheral side, thereby ensuring the rigidity of the cover member 21 and the cover member 21. And the bolt which joins the hinge 31 straddling the apron 3 has a role which protects from earth and sand.

  In order for the shield cover 2 to suppress the scattering of earth and sand scraped up by the claws 7, it is desirable to arrange a plurality of soil adhesion preventing members 4 so as to surround the work rotor 5. Therefore, in the drawing, the cover member 21 located on the front side and the cover member 21 located on the rear side are both composed of the front plates 21a and 21d and the back plates 21c and 21e, so that the inner peripheral surface of the shield cover 2 is clawed. 7 is formed in a polygonal shape close to a curved surface (arc surface) in accordance with a circular locus drawn by the tip of 7, and the soil adhesion preventing member 4 is fixed to the inner peripheral surface of this polygonal shape.

  As a result, a plurality of soil adhesion preventing members 4 are arranged so as to form an arc surface on the cross section of the rotary shaft 6, so that the rotating claw 7 is surrounded within a minimum region, so that the earth and sand are on the shield cover 2 side. There is an advantage that the range to be scattered can be minimized. The soil adhesion preventing members 4 positioned on both sides in the circumferential direction of the shield cover 2 are pushed toward the work rotor 5 by the back plates 21 c and 21 e, so that the plurality of soil adhesion preventing members 4 are arcuate so as to surround the work rotor 5. Since it arranges so that a plane may be made, scattering of earth and sand can be suppressed as much as possible.

  The surface of the shield cover 2 on the work rotor 5 side (inner peripheral surface) or the surface of the shield cover 2 and the apron 3 on the work rotor 5 side (inner peripheral surface) as shown in FIG. The members 4 are arranged and fixed in the circumferential direction of the shield cover 2. When there is no apron 3, the soil adhesion preventing member 4 is fixed only to the shield cover 2.

  When the apron 3 is connected to the shield cover 2, the apron 3 is disposed, for example, at the apron 3 side end of the shield cover 2 in parallel (horizontally) with the shaft of the transmission frame 14, and a shaft 31 a that becomes a part of the apron 3. Is connected to the cover material 21 located at the rearmost position by a hinge 31 so as to be rotatable with respect to the shield cover 2. The shaft 31a which is a part of the apron 3 is inserted into a blade 31b having a shape surrounding the shaft 31a to constitute a hinge 31.

  When a plurality of soil adhesion preventing members 4 are fixed to the rotary cover 1 in which the shield cover 2 and the apron 3 are combined, the openings 21A and 21B are located in a range where the two soil adhesion preventing members 4 and 4 do not overlap. As described above, the fixing position of each soil adhesion preventing member 4 to the shield cover 2 and the apron 3 is determined. Specifically, as shown in FIG. 1, each soil adhesion is performed such that the openings 21 </ b> A and 21 </ b> B are located in a range where the soil adhesion preventing member 4 located on the upstream side in the rotation direction does not overlap the soil adhesion preventing member 4 located on the downstream side. The prevention member 4 is fixed to the shield cover 2 and the apron 3.

  The soil adhesion preventing member 4 is mainly made of hard rubber having a thickness of about several millimeters to several tens of millimeters, and has elasticity enough to vibrate by itself as the work machine body 10 vibrates. If the soil adhesion preventing member 4 has the appropriate elasticity mentioned here, the material of the soil adhesion preventing member 4 is not limited, and a metal plate such as plastic or stainless steel is also used. In addition to the plate-like member having a constant circumferential length in the circumferential direction of the shield cover 2 and having a shape continuous in the width direction, the soil adhesion preventing member 4 has a plate-like member continuous in the width direction as a rotary shaft 6. A strip-shaped plate cut along an orthogonal cross section is also used.

  Of the two soil adhesion preventing members 4, 4 adjacent to the circumferential direction of the shield cover 2, two on the opposite side of the circumferential adhesion fixed side of the soil adhesion preventing member 4 located upstream in the rotation direction of the work rotor 5. In order to prevent the entry of soil between the soil adhesion preventing members 4, 4, a contact portion 41 that can contact the surface on the inner peripheral side of the soil adhesion preventing member 4 adjacent to that side is formed.

  For example, as shown in FIG. 1, the contact portion 41 is formed by folding back an end portion (tip portion) of the soil adhesion preventing member 4 adjacent to the downstream side on the soil adhesion preventing member 4 side. In addition, as shown in FIGS. 9A to 9E, the contact portion can be formed by other shapes or the like. (A) is the example which formed the contact part 41a by bending so that the front-end | tip of the soil adhesion prevention member 4 might contact the shield cover 2 side. (B) forms the contact portion 41b by bending the tip of the soil adhesion preventing member 4 to the shield cover 2 side, once to the fixed end side of the soil adhesion preventing member 4, and then to the opposite side of the fixed end. It is an example. (C) is the example which formed the contact part 41c as a thick part which has thickness in the front-end | tip part of the soil adhesion prevention member 4. FIG. (D) is a case where the soil adhesion preventing member 4 is made of rubber. For example, in a state in which the tip is bulged, or by forming a tip having a hollow portion inside, the tip is thickened and abutted This is an example of the portion 41d.

  In these (a) to (d), it is preferable that the contact portions 41a, 41b, 41c, 41d and the soil adhesion preventing member 4 are formed of the same material. It is. For example, (e) is a contact portion having a thickness that comes into contact with the inner peripheral surface of the soil adhesion preventing member 4 adjacent to the soil adhesion preventing member 4 by integrating separate parts of different materials with the tip of the soil adhesion preventing member 4. This is an example in which 41e is formed. According to each of the above examples, the contact portion 41 can cover the fixing position (fixing tool 8) of the soil adhesion preventing member 4 adjacent to the downstream side of the work rotor 5. Further, the contact portion 41 prevents the earth and sand from entering between the soil adhesion preventing members 4 and 4.

  Folding (bending) the tip is mainly performed in the case of a plastically deformable metal material or a synthetic resin that can maintain the shape of the soil adhesion preventing member 4 itself. For example, when the soil adhesion preventing member 4 is made of a metal material, the folded (bent) portion is plastically deformed while maintaining the elasticity of the contact portion 41 by folding the tip of the soil adhesion preventing member 4. Regardless of the vibration of the soil adhesion preventing member 4, it is possible to obtain a state in which the contact portion 41 is always in contact with the inner peripheral surface of the downstream soil adhesion preventing member 4. For example, as shown in FIGS. 1, 4 and 5, the contact portion 41 contracts when the pressure when contacting the adjacent soil adhesion preventing member 4 is large, and returns to the original shape when the pressure decreases. By imparting sufficient elasticity to the contact portion 41, the contact state with the adjacent soil adhesion preventing member 4 is always maintained, and the formation of a gap between the soil adhesion preventing member 4 is prevented. It is possible.

  Even when rubber is used for the abutting portion 41, for example, if the inside and the outside of the hollow portion formed in the tip portion having a thickness are made to have the same pressure, the contact is received at the time of contact with the soil adhesion preventing member 4 on the downstream side. It is possible to contract when the pressure is large and expand when the pressure is reduced, and it is possible to always maintain a contact state with the adjacent soil adhesion preventing member 4 (FIG. 9D). In addition, the contact portion 41 may be made of a foamable material that contracts when contacting the adjacent soil adhesion preventing member 4 and expands or expands when it is separated from the soil adhesion preventing member 4. (FIG. 9 (e)).

  1 and FIGS. 9A to 9E show an example in which the contact portion 41 is not provided at the tip of the soil adhesion preventing member 4 located on the most downstream side of the rotation of the work rotor 5. However, the contact portion 41f can be provided as shown in FIG. In this case, the corresponding contact portion 41f contacts the back plate 21c because the soil adhesion preventing member 4 does not exist on the downstream side. As a result, adhesion of earth and sand to the back plate 21c is prevented, and further, entry of earth and sand between the back plate 21c and the earth adhesion preventing member 4 is also prevented.

  The soil adhesion preventing member 4 is detachably fixed to the shield cover 2 and the apron 3 so as to be replaceable by a fixing tool 8 such as a bolt or a pin. The fixing tool 8 is arranged at one place or two places in the circumferential direction of the soil adhesion preventing member 4 (circumferential direction of the shield cover 2). Since the adjacent soil adhesion preventing members 4 and 4 are overlapped so that the fixing position by the fixture 8 is covered with the soil adhesion preventing member 4 located on the rear side in the traveling direction or on the front side as described later, On the cross section, it is better that the number of the fixtures 8 is small, and the fixtures 8 are fixed at one place in the drawing. The fixing tool 8 is disposed at an appropriate interval in the length direction of the soil adhesion preventing member 4 (length (width) direction of the shield cover 2).

  Since the plurality of soil adhesion preventing members 4 overlap so that the upstream soil adhesion preventing member 4 covers the downstream soil adhesion preventing member 4 from the work rotor 5 side, the claw 7 scrapes the earth and sand backward in the traveling direction. When rotating so as to be raised, the soil adhesion preventing member 4 on the rear side is fixed so as to cover the soil adhesion preventing member 4 on the front side as shown in the figure. The adhesion preventing member 4 is fixed so as to cover the soil adhesion preventing member 4 on the rear side.

  In FIG. 1, two soil adhesion preventing members 4 are overlapped and fixed to the shield cover 2 excluding the apron 3, but when the soil adhesion preventing member 4 is also fixed to the apron 3 as shown in the figure. Since the soil adhesion preventing member 4 and the soil adhesion preventing member 4 of the shield cover 2 can be overlapped, it is sufficient that at least one soil adhesion preventing member 4 is fixed to the shield cover 2. In some cases, three or more soil adhesion preventing members 4 are fixed to the shield cover 2.

  The plurality of soil adhesion preventing members 4 are fixed to the shield cover 2 and the apron 3 while two adjacent soil adhesion preventing members 4 and 4 partially overlap each other in the circumferential direction of the shield cover 2. The overlapping method of the soil adhesion preventing members 4 and 4 adjacent to each other in the circumferential direction of the shield cover 2 is determined by the rotation direction of the claw 7.

  When the claw 7 rotates down-cut in the direction indicated by the arrow, the soil adhesion preventing member 4 located on the rear side is located forward from the viewpoint of preventing soil from entering between the adjacent soil adhesion preventing members 4 and 4. Adjacent soil adhesion preventing members 4, 4 are arranged so that the soil adhesion preventing member 4 located on the side overlaps from the rotary shaft 6 side. When the claw 7 rotates up-cut in the opposite direction, the soil adhesion preventing member 4 located on the front side in the traveling direction is arranged so that the soil adhesion preventing member 4 located on the rear side overlaps from the rotary shaft 6 side. .

  As shown in the figure, when the claw 7 rotates down-cut so as to kick the soil toward the rear in the direction of travel, the front of the tractor in the direction of travel relative to one of the two soil adhesion preventing members 4 and 4 that overlap each other. The soil adhesion preventing member 4 located at the position is fixed to the shield cover 2 at the overlapping portion, and the fixing position (fixing tool 8) of the soil adhesion preventing member 4 is covered by the soil adhesion preventing member 4 located on the rear side in the traveling direction. It is concealed from the rotary shaft 6 side.

  In this case, the soil adhesion preventing member 4 located on the rear side in the traveling direction covers the fixed position of the soil adhesion preventing member 4 located on the front side, and overlaps with the soil adhesion preventing member 4 from the rotary shaft 6 side, and the shield cover 2. Fixed to. The soil adhesion preventing member 4 fixed to the apron 3 overlaps the soil adhesion preventing member 4 from the rotary shaft 6 side while covering the fixed position of the soil adhesion preventing member 4 located on the most rear side of the shield cover 2. The fixing work of each soil adhesion preventing member 4 to the shield cover 2 is performed on the shield cover 2 sequentially from the soil adhesion preventing member 4 located on the front side in the traveling direction of the tractor to the soil adhesion preventing member 4 adjacent on the rear side. The procedure is to fix.

  When the claw 7 rotates down-cut, the soil adhesion preventing member 4 located on the front side in the traveling direction is covered with the soil adhesion preventing member 4 located on the rear side, and the shield cover 2 is covered with the soil adhesion preventing member 4 on the rear side. Since it is fixed at the covered position, the fixing position to the shield cover 2 is on the rear side in the traveling direction with respect to the circumferential direction of the soil adhesion preventing member 4.

  The soil adhesion preventing member 4 is fixed to the shield cover 2 on the rear side in the circumferential direction, and the front side is only in contact with the adjacent soil adhesion preventing member 4 with the contact portion 41, so that the tip portion is directed upward. Although there is a limitation on the displacement, other than that, it can be freely displaced. Therefore, since the section from the tip of the soil adhesion preventing member 4 to the fixed position is not restricted, relatively free vibration is generated in this section with the vibration of the work machine body 10, and the soil adhesion preventing member 4 It has the function of dropping soil and sand adhering to it by vibration.

  When the contact portion 41 is not provided, the soil adhesion preventing member 4 located on the upstream side in the rotational direction tends to hang down from the fixed end side to the tip end side (free end side). A gap is formed between the inner peripheral surface of the soil adhesion preventing member 4 adjacent to the downstream side during operation of the work machine body 10). Moreover, since the soil adhesion preventing member 4 vibrates with the vibration of the work machine body 10, the gap between the soil adhesion preventing member 4 adjacent to the downstream side increases or decreases.

  On the other hand, the upstream-side soil adhesion preventing member 4 has a contact portion 41 that maintains a contact state with the inner peripheral surface of the downstream-side soil adhesion preventing member 4 on the free end side. In addition to the normal time, it is possible to keep the gap closed even when the vibration generated in the soil adhesion preventing member 4 is large. As a result, since the amount of earth and sand entering between the adjacent soil adhesion preventing members 4 and 4 is reduced compared to the case where there is no contact portion 41, the work of removing earth and sand through the openings 21A and 21B of the shield cover 2 is reduced. Will be.

  Since each soil adhesion preventing member 4 vibrates independently, a force toward the work rotor 5 is applied to the free end of the upstream soil adhesion preventing member 4, and the downstream soil adhesion preventing member 4 When a force toward the shield cover 2 is applied to the free end, the contact portion 41 may be separated from the soil adhesion preventing member 4. At this time, light and fine earth and sand that momentarily collided with the inner peripheral surface of the soil adhesion preventing member 4 may enter between the downstream soil adhesion preventing member 4 and the upstream soil adhesion preventing member 4. . As a result of this being repeated, it is assumed that the earth and sand that entered between the two soil adhesion preventing members 4 and 4 accumulate.

  When the earth and sand are deposited between the two soil adhesion preventing members 4 and 4, a brush or the like is inserted between the outer periphery of the shield cover 2 and between the soil adhesion preventing members 4 and 4, and the earth and sand in the lump state are removed from the shield cover 2. It is scraped off to the outer peripheral side or scraped off to the inner peripheral side, or a hose or the like is inserted, and water or air is jetted to wash away the earth and sand. FIG. 5 shows the removal of accumulated sediment that has entered between the soil adhesion preventing member 4 fixed to the cover material 21 located behind the shield cover 2 and the soil adhesion preventing member 4 secured to the apron 3. In this manner, the apron 3 is flipped up and stopped by the compression rod 18. The apron 3 is flipped up at a place where the work machine body 10 is moved from the farm field onto a flat ground.

  In the state in which the apron 3 is flipped up, the shield cover 2 side surface of the soil adhesion preventing member 4 fixed to the apron 3 is in contact with the hinge 31, while the free end side is in contact with one of the claws 7, and the fixed end As the side follows the springing up of the apron 3, the soil adhesion preventing member 4 tends to bend toward the working rotor 5 side. As a result, since the space between the soil adhesion preventing member 4 and the cover material 21 is increased, cleaning of the surface on the shield cover 2 side of the soil adhesion preventing member 4 fixed to the apron 3 from a state where the apron 3 is not flipped up. Can be done easily and reliably.

1 ... Rotary cover, 2 ... Shield cover, 2a ... Connecting material,
21 ... Cover material, 21a ... Front plate, 21b ... Bent part, 21c ... Back plate, 21d ... Front plate, 21e ... Back plate, 22 ... End plate,
21A: Opening (between the cover materials 21, 21), 21B: Opening (between the cover material 21 and the apron 3),
3 ... Apron, 3a ... Bracket,
31 …… Hinge, 31a …… Shaft, 31b …… Blade,
4 ... dirt adhesion preventing member (plate-like member), 41 ... contact part, 41a to 41f ... contact part 5 ... working rotor, 6 ... rotary shaft, 7 ... claw, 8 ... fixing tool (bolt),
10 …… Work machine body, 11 …… Top mast, 12 …… Lower link joint,
13 …… Gearbox, 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,
18 ... Compression rod, 18a ... Coil spring, 18b ... Locking part,
19 …… Stopper, 20 …… Gauge wheel

Claims (2)

A soil adhesion preventing member comprising a plurality of plate-like members provided on a shield cover that covers an upper portion of a work rotor that is attached to a rear portion of a tractor and supported by a work machine main body that travels together with the tractor,
The plate-like member is
Fixed to the inner surface of the shield cover at a position on one side in the circumferential direction of rotation of the working rotor;
A soil adhesion preventing member, wherein an abutting portion that contacts a plate-like member adjacent to the fixed side in a normal state is formed on the opposite side of the fixed side.   A rotary cover for a rotary working machine comprising the soil adhesion preventing member according to claim 1.

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