JP5160531B2 - Soil improvement machine mixing equipment - Google Patents

Description

  The present invention relates to a mixing device of a soil improvement machine for mixing earth and sand.

  The need for soil improvement machines to be mixed with soil improvement materials such as lime is increasing for soil that requires improvement, such as excavated soil that is generated appropriately in various excavation operations, under the recent promotion of waste recycling. doing.

  This soil improvement machine is equipped with a stirring means having a large number of stirring blades installed on the outer periphery of a horizontally extending rotating shaft as a mixing device for mixing earth and sand, and agitating the soil with the blade surface of the stirring blades. is there. This agitation means disintegrates the earth and sand with an agitating blade whose blade surface is inclined with respect to the rotation shaft, and agitates and mixes the mixture while transferring it in the direction of the outlet of the mixing device (see Patent Document 1).

JP 2002-70064 A

  However, in the case of a mixing apparatus equipped with the above stirring means, when the mixing blade has high mixing performance by cutting and crushing into the earth and sand, for example, large foreign matters such as rocks and dust are mixed in the earth and sand For example, foreign substances may be held by the side facing the front in the rotation direction of the stirring blade, which may cause the foreign substances inside the mixing apparatus to be caught. Further, for example, when a string-like or surface-like foreign matter having poor rigidity is mixed in the earth and sand, the foreign matter may be caught by the stirring blade and entangled with the rotating shaft. In both cases of foreign matter biting and entanglement, the mixing device must be stopped and the foreign matter must be removed manually, which causes an increase in work stoppage time and a reduction in work efficiency.

  The objective of this invention is providing the mixing apparatus of the soil improvement machine which can suppress the catch of the foreign material to a stirring blade.

  To achieve the above object, according to a first aspect of the present invention, there is provided a mixing apparatus of a soil improvement machine for mixing earth and sand, a casing having an inlet for earth and sand at an upper part on one side in the longitudinal direction and an outlet at a lower part on the other side, A rotating shaft extending in the longitudinal direction in the casing, a stirring blade disposed on a spiral locus on an outer peripheral portion of the rotating shaft, and a fan-like connecting plate for connecting adjacent stirring blades on the spiral locus. The connecting plate has at least two planes having different angles with respect to the rotation axis when viewed from the radial direction of the rotation axis, and the height from the outer peripheral surface of the rotation axis is lower than the stirring blade. It is formed.

  According to a second invention, in the first invention, the plane of the connecting plate on the outlet side of the casing has a larger attachment angle with respect to the rotating shaft than the plane of the inlet side of the casing.

  According to a third aspect, in the second aspect, the plane on the outlet side of the casing is inclined along the blade surface of the stirring blade to which the plane is connected, and the plane on the inlet side of the casing is on the rotating shaft. It is characterized by being along an orthogonal plane.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the spiral locus in which the stirring blade is disposed has two lines on the inlet side and one line on the outlet side of the casing.

  According to a fifth invention, in any one of the first to fourth inventions, from the stirring blade to the front side in the rotation direction of the stirring blade disposed on the most inlet side of the casing on the spiral locus, the rotating shaft It is characterized in that a relief plate formed in a fan shape is provided.

  According to the present invention, it is possible to suppress the foreign matter from being caught on the stirring blade.

It is a side view showing the whole soil improvement machine provided with the mixing device concerning one embodiment of the present invention. It is a top view showing the whole soil improvement machine provided with the mixing device concerning one embodiment of the present invention. It is a side view which extracts and represents the soil improvement material supply apparatus with which the soil improvement machine provided with the mixing apparatus which concerns on one Embodiment of this invention was equipped. It is a top view which extracts and represents the soil improvement material supply apparatus with which the soil improvement machine provided with the mixing apparatus which concerns on one Embodiment of this invention was equipped. It is a side view of the stirring means with which the mixing apparatus which concerns on one Embodiment of this invention was equipped. It is a top view of the stirring means with which the mixing apparatus which concerns on one Embodiment of this invention was equipped. It is sectional drawing by the VII-VII line in FIG. It is the perspective view seen from diagonally back of the right and left stirring means with which the mixing device concerning one embodiment of the present invention was equipped. It is a bottom view of the left and right stirring means provided in the mixing apparatus according to an embodiment of the present invention. It is the perspective view seen from diagonally back of the left stirring means with which the mixing apparatus which concerns on one Embodiment of this invention was equipped. It is a right side of the left stirring means with which the mixing apparatus which concerns on one Embodiment of this invention was equipped. It is the front view which extracted and represented the connection board with which the mixing device concerning one embodiment of the present invention was equipped. It is a side view by the XIII arrow in FIG. It is a top view of the other structural example of the right and left stirring means with which the mixing apparatus which concerns on one Embodiment of this invention was equipped.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a side view showing the entire structure of a soil conditioner equipped with a mixing device according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. In the present embodiment, the right side in FIGS. 1 and 2 is the front of the body, and the left side is the rear of the body.

  These soil quality improvement machines shown in FIGS. 1 and 2 include a traveling body 1 for traveling on its own, a hopper 12 for receiving the soil to be modified, a transport conveyor 13 for transporting the soil received in the hopper 12, and the soil A soil improvement material supply device 14 for supplying a soil improvement material, a mixing device 19 for mixing and processing soil and a soil improvement material, a discharge conveyor 26 for transporting the improved soil discharged from the mixing device 19 and discharging it to the outside of the machine, and various mounted devices A power pack (power device) 21 incorporating a power source of the device is provided.

  The traveling body 1 includes a pair of left and right traveling devices 2 and a pair of main body frames 3 provided substantially parallel to the upper portion of the traveling device 2. The traveling device 2 includes a track frame 4 continuously provided at a lower portion of the main body frame 3, driven wheels (idlers) 5 and drive wheels 6 provided at both ends of the track frame 4, and crawler belts wound around the driven wheels 5 and the drive wheels 6. (Endless track crawler belt) 7 and a driving device 8 for traveling directly connected to the driving wheel 6 are provided. Support posts 9a and 9b are erected on the main body frame 3. The support posts 9a and 9b support the support frame 10 disposed above one side (the rear side of the machine body) in the longitudinal direction of the main body frame 3, and A support frame 11 that is disposed substantially above the center in the longitudinal direction of the main body frame 3 is supported.

  The hopper 12 is a frame-shaped member that is open at the top and bottom, and is formed so as to expand upward. The hopper 12 is supported on one side (the rear side of the machine body) in the longitudinal direction of the main body frame 3 via the support frame 10. The conveyor 13 is supported by the support posts 9a and the like, and extends substantially horizontally from below the hopper 12 to above the inlet 74 (see FIG. 5) of the mixing device 19.

  The soil improvement material supply device 14 includes a storage tank 15 that stores the soil improvement material, a chute 17 that is connected to a lower portion of the storage tank and has a diameter reduced downward, and a soil improvement in the storage tank 15 that is guided by the chute 17. A screw feeder 16 is provided for supplying the material to the earth and sand, and is disposed on the substantially central portion of the main body frame 3 via the support frame 11. A crane 18 (see FIG. 2) is disposed on the left side of the machine body (upper side in FIG. 2) so as to be located on the side of the soil improvement material supply device 14. The crane 18 is used when, for example, a flexible container (ton pack) filled with a soil improvement material is suspended above the storage tank 15 and the storage tank 15 is filled with the soil improvement material in the flexible container.

  The mixing device 19 mixes the earth and sand introduced from the transport conveyor 13 by a stirring means (described later) to generate improved soil, and the mixing device 19 is disposed below the screw feeder 16 so as to be positioned below the screw feeder 16. It is provided substantially at the center in the longitudinal direction. A space from the discharge end (right end portion in FIG. 1) of the transport conveyor 13 to the entrance 74 (see FIG. 5) of the earth and sand and the soil conditioner of the mixing device 19 is surrounded by the cover 20. The discharge port 64 (see FIG. 3) of the soil conditioner of the screw feeder 16 is surrounded by the cover 20, and scattering of the earth and sand and the soil conditioner when being introduced into the inlet of the mixing device 18 is suppressed.

  The power pack 21 is supported on the other end (front end) in the longitudinal direction of the main body frame 3 via a support member 22. A driver's seat 23 is provided in a front section of the power pack 21. The driver's seat 23 is provided with an operation lever 24 and the like for operating the traveling device 2. An operation panel 25 for operating each mounted device such as the mixing device 19 is provided below the power pack 21 on the right side of the machine body.

  The discharge conveyor 26 extends substantially horizontally from the lower portion of the mixing device 19 between the left and right traveling devices 2 to the front by a predetermined distance, then bends near the lower portion of the power pack 21 and tilts upward toward the front. It is extended. The upstream side (the rear side of the machine body) of the discharge conveyor 26 is provided on the main body frame 3 via a support member (not shown), and the downstream side (the front side of the machine body) is provided on the front portion of the power pack 21 via support members 29 and 30. 28 are supported in a suspended manner. A drive device 27 (see FIG. 2) for the discharge conveyor 26 is connected to the drive pulley at the discharge end of the discharge conveyor 13.

  FIG. 3 is a side view showing the soil improvement material supply device 14 extracted, and FIG. 4 is a plan view thereof.

  3 and 4, the storage tank 15 includes a frame 41 fixed on the support frame 11, a frame-shaped bottom plate 42 fixed on the frame 41, and a cylindrical bellows portion continuously provided on the bottom plate 42. 43 and a top plate 44 connected to the upper part of the bellows portion 43. The bellows portion 43 is made of a flexible material that can expand and contract, for example, a polyethylene rubber material. As shown in FIG. 3, the pitch of the reinforcing ring 45 becomes narrower as the internal pressure from the soil improvement material stored inside increases. It is. On the top surface of the top plate 44, an opening / closing lid 46 that opens and closes an inlet (not shown) for the soil improvement material at the center of the top plate 44 is attached via a hinge 47.

  A plurality (four in this example) of attachment portions 48 are provided on the outer peripheral portion of the top plate 44. A support column 49 is fixedly suspended below the attachment portions 48. Each support column 49 is passed through a guide cylinder 51 attached to the bottom plate 42 of the storage tank 15 so as to be slidable up and down. At this time, upper and lower pin holes 50 (only the upper pin hole 50 is shown) are formed in each support column 49 so as to be selectively connected to the guide tube 51. Thereby, during operation, the internal space of the storage tank 15 is secured by fixing the pin hole 50 on the lower side of the support column 49 and the guide cylinder 51 with the stopper pin 52 (see FIG. 3), while improving the soil quality. When the machine is transported by a trailer or the like, the bellows portion 43 is shortened to reduce the height by sliding the support column 49 downward and fixing the upper pin hole 50 and the guide tube 51 with the stopper pin 52. The storage tank 15 can be fixed in a state.

  The chute 17 is a frame-shaped member that allows the storage tank 15 and the screw feeder 16 to communicate with each other. The chute 17 has a role of introducing a soil improving material that is reduced in diameter downward and filled in the storage tank 15 into the screw feeder 16. Fulfill.

  The screw feeder 16 includes a cylindrical casing 61, a screw (not shown) accommodated in the casing 61, a bearing 67 that rotatably supports the screw with respect to the casing 61, and a drive for the screw feeder 16. A device (hydraulic motor or the like) 63 and a drive transmission device 70 for transmitting the power of the drive device 63 to the screw are provided. The casing 61 itself is joined to the lower portion of the chute 17 and is fixed by being connected to the outer wall surface of the chute 17 via the support member 68. The downstream end of the casing 61 in the transfer direction of the soil improvement material is positioned above the discharge end of the transport conveyor 13, and a soil improvement material discharge port 64 for discharging the soil improvement material is provided at the downstream end. Open downward.

  5 is a plan view of the stirring means 72L and 72R provided in the mixing device 19, FIG. 6 is a side view thereof, and FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5-7, the stirring means is represented by a solid line, and the other components of the mixing device 19 are simply represented by a two-dot chain line. In addition, since the stirring means 72L and 72R described later are rotating bodies, the illustrated state viewed from the radial direction is not determined, but "plan view", "side view" and "bottom view" described later are described in explaining the drawings. Is based on the state shown in FIGS.

  5 to 7, the mixing device 19 is provided substantially horizontally in the vicinity of the central portion in the longitudinal direction of the main body frame 3, and includes a casing 71 that forms the main body and stirring means 72 </ b> L and 72 </ b> R provided in the casing 71. And a driving device 73 for the mixing device 19 that rotationally drives the stirring means 72L and 72R.

  The casing 71 has an inlet 74 for earth and sand and a soil improvement material at the upper part on one side (the rear side of the machine body) in the longitudinal direction, and an outlet 75 at the lower part on the other side (the front side of the machine body). Each part except for is sealed. The casing 71 is a trough container. As shown in FIG. 7, the top plate is formed flat, while the bottom surface is curved along the rotation trajectory of two stirring means 72 arranged in parallel. It is composed of curved surfaces. The top plate of the casing 71 is composed of a plurality of lids arranged in the front-rear direction (see FIGS. 1 and 3), and can be removed to open the upper portion of the casing 71.

  The stirring means 72L, 72R are a fan shaft (this embodiment) that connects the rotating shaft 76 extending in the longitudinal direction in the casing 71, the stirring blade 77 provided on the outer periphery of the rotating shaft 76, and the two stirring blades 77. In this case, a connection plate 78 having a quadrant shape is provided.

  Two rotating shafts 76 are provided in parallel in the casing 71, and both front and rear ends are coaxially connected to the drive shaft 79 and the driven shaft 80, and are attached to and detached from the drive shaft 79 and the driven shaft 80 by bolts. It is concluded that possible. The cross section of the rotating shaft 76 is circular, but the cross sectional shape can be changed to another shape such as a rectangle if necessary. Moreover, although the rotating shaft 76 is comprised with a hollow member, it can also be comprised with a solid member. The previous drive shaft 79 and driven shaft 80 are rotatably supported by bearings 81 and 82 provided before and after the casing 71, respectively.

  Also, as shown in FIG. 7, the stirring means 72L, 72R have overlapping rotation trajectories, so that the stirring blades 77 interfere with each other if they do not rotate at the same rotational speed in opposite directions. Therefore, the left and right drive shafts 79 are respectively provided with gears 83 (only the right side is shown in FIG. 5) that meshes with the front part of the bearing 81, and the right and left drive shafts 79 are engaged with each other. The shaft 79 rotates in the opposite direction (see the arrow in FIG. 7) at the same rotational speed. The front ends of the left and right drive shafts 79 are connected to the output shaft of the drive device 73 described above.

  In this embodiment, the left and right drive shafts 79 are driven by the two drive devices 73 and the rotational speeds of the left and right drive shafts 79 are aligned by the gear 83. However, one drive device 73 is omitted, The driving shaft 79 can be driven by the driving device 73, and the rotation of one driving shaft 79 can be transmitted to the other driving shaft 79 by the gear 83.

  8 is a perspective view of the left and right stirring means 72L and 72R extracted from the oblique rear side, FIG. 9 is a bottom view thereof, and FIG. 10 is a perspective view of the left stirring means 72L further extracted and viewed from the oblique rear side. Is the right side.

  As shown in FIGS. 8 to 11, the stirring blade 77 includes a rod portion 84 as a support member and a blade portion 85 having a blade surface for stirring and transferring earth and sand. The rod portion 84 extends in the radial direction of the rotating shaft 76 and is fixed to the outer peripheral portion of the rotating shaft 76 by welding. The wing portion 85 is fastened to the rod portion 84 with a bolt and can be attached to and detached from the rod portion 84. A counterbore is provided on the blade surface of the wing portion 85 so that the head of the bolt does not protrude from the blade surface. Further, the blade 85 has a blade surface inclined at a predetermined angle α (for example, about 45 degrees, see FIG. 9) with respect to the rotation shaft 76 when viewed from the radial direction of the rotation shaft 76, and in front of the rotation direction on the outlet 75 side As a result, the sand and the like are agitated and mixed, and transferred in the direction of the outlet 75 of the casing 71. The blade surface of the wing portion 85 has a width in the rotational direction wider than the diameter of the rod 84.

  At this time, in this embodiment, the stirring blades 77 are arranged on the spiral trajectories S1 and S2 (see FIG. 9) at a predetermined pitch (90-degree pitch in this example). The spiral trajectories S1 and S2 in which the stirring blades 77 are disposed are mutually connected to each other of the stirring means 72L and 72R so that when the rotary shaft 76 rotates as shown by arrows in FIG. Winding in the opposite direction. Further, in the left and right stirring means 72L and 72R, the spiral locus S2 is shorter than the spiral locus S1, and as shown in FIG. 9, on the inlet 74 side (upstream side in the sediment transport direction) of the casing 71, the spiral locus is S1 and S2. On the other hand, on the exit 75 side (downstream side in the sediment transport direction), the spiral trajectory decreases to one line of S1. For this reason, the stirring blades 77 are arranged on the inlet 74 side of the casing 71 at a density sufficient to obtain a sufficient stirring, mixing, and transfer action of the earth and sand, whereas the stirring is performed at the outlet 75 compared to the inlet 74 side. The arrangement density of the wings 77 is sparse. In such a manner, the stirring blade 77 is disposed between the position facing the inlet 74 of the casing 71 and the outlet 75.

  The connecting plate 78 connects two stirring blades 77 adjacent on the spiral trajectories S1 and S2 to fill the space between the stirring blades 77 on the spiral trajectories S1 and S2, and connects the stirring blades 77 in a spiral shape as a whole. .

  FIG. 12 is a front view (drawing from the front of the machine body) showing the connecting plate 78 extracted from the right stirring means 72R, and FIG. 13 is a side view taken along arrow XIII in FIG.

  The connecting plate 78 shown in FIG. 12 and FIG. 13 includes a main part 86 of the fan and side surfaces 87 and 88 extending in the radial direction of the rotary shaft on both sides of the main part 86, respectively. It welds with respect to the rod part 84 of the two adjacent stirring blades 77 (It is good also as a structure which can be attached or detached with a volt | bolt etc.). The height of the outer peripheral portion of the connecting plate 78 taken from the outer peripheral surface of the rotary shaft 76 is higher than the innermost (root side) portion of the blade portion 85 in the rotational shaft radial direction of the stirring blade 77, and the rotation of the blade portion 85. It is lower than the outermost portion (tip portion) in the axial direction. Preferably, it is about the same as the tip of the rod portion 84 of the stirring blade 77 or slightly lower than the tip of the rod portion 84 of the stirring blade 77 (for example, the blade portion 85) as shown in each of FIGS. Of the two bolts for fixing the outer periphery of the rotating shaft in the radial direction of the rotating shaft), and the outer peripheral portion of the connecting plate 78 of the present embodiment is the tip of the wing portion 85 attached to the rod portion 84. It is located at about 1 / 4-1 / 3 of the side.

  Further, as shown in FIG. 13, the connecting plate 78 has mounting angles β, γ (0 <β <γ) with respect to the rotation shaft 76 (center line C is shown in FIG. 13) as viewed from the radial direction of the rotation shaft 76. ≦ 90 °), two planes 89 and 90 connected to each other are provided. In the present embodiment, the boundary line L between the planes 89 and 90 is parallel to the rod 84 on the outlet 75 side of the casing 71 of the two stirring blades 77 connected to the connecting plate 78, and the stirring blade on the outlet 75 side. The plane 89 connected to 77 is along the blade surface of the blade 85 of the stirring blade 77 on the outlet 75 side (β = α or β≈α). On the other hand, the plane 90 connected to the stirring blade 77 on the inlet 74 side is along a plane orthogonal to the rotation shaft 76.

  Needless to say, the connecting plate 78 used for the left stirring means 72L is configured symmetrically with that shown in FIGS.

  Here, as described above, the two agitating blades 77 adjacent to each other on the spiral trajectories S1 and S2 are connected by the connecting plate 78, but the agitating blade arranged closest to the inlet 74 on the spiral trajectories S1 and S2. 77 does not further have a stirring blade 77 as a connection partner on the inlet 74 side. Similarly, the stirring blade 77 disposed on the most exit side 75 on the spiral trajectories S1 and S2 also has no stirring blade 77 serving as a connection partner on the outlet 75 side. Since the side surface on the outlet 75 side of the stirring blade 77 closest to the outlet 75 on the spiral trajectories S1 and S2 faces the rear side in the rotational direction of the stirring means 72L and 72R, in this embodiment, the outlet of the stirring blade 77 Nothing is provided on the side surface on the 75 side. On the other hand, the side surface on the inlet 74 side of the stirring blade 77 closest to the inlet 74 on the spiral trajectories S1 and S2 faces the front side in the rotational direction of the stirring means 72L and 72R. On the inlet 74 side of the blade 77, a baffle plate 91 formed in a fan shape (semicircular shape in the present embodiment) from the stirring blade 77 to the rotating shaft 76 is provided. However, there may be a case where the obstacle plate 91 is not provided at a place where the adjacent stirring means 72 and the obstacle plate 91 are likely to interfere with each other (see FIG. 6).

  The evacuation plate 91 is a component for smoothly connecting the side facing the front side in the rotation direction of the stirring blade 77 to be attached to the rotation shaft 76 and suppressing the foreign matter from being caught on the stirring blade 77. The obstacle plate 91 is connected and fixed to the rod portion 84 of the stirring blade 77 to be attached and the outer peripheral surface of the rotary shaft 76 by welding (may be configured to be detachable with bolts). The height of the baffle plate 91 taken from the outer peripheral surface of the rotating shaft 76 is approximately the same as that of the connecting plate 78 at the portion connected to the stirring blade 77, and gradually decreases from the connecting plate 78 to the connecting side with the rotating shaft 76. It has become. Further, the obstacle plate 91 is not bent like the connecting plate 78 and is attached along a plane parallel to the blade portion 85 of the stirring blade 77 to be attached.

  Although not an essential requirement, in the present embodiment, from the viewpoint of adjusting the arrangement density of the stirring blades 77, there is a portion where the spiral pitch is partially changed in the middle portion of the spiral locus S1. In this place, the mutual positional relationship between the two stirring blades 77 adjacent to each other on the spiral is different from the others, so that these stirring blades 77 are not connected by the connecting plate 78. Therefore, in the present embodiment, the above-described obstacle plate 91 is provided on the inlet 74 side of the stirring blade 77 on the outlet 75 side of the two that are not connected.

  As shown in FIGS. 5 and 6, in this embodiment, the scraping blade 92 is disposed at the most upstream position in the sediment transport direction of the stirring means 72 </ b> L and 72 </ b> R, and the return blade 93 is disposed at the position facing the outlet 75 of the casing 71. Are provided. The scraping blade 92 is not as large as the stirring blade 77, but the surface facing forward in the rotation direction is inclined with respect to the rotation shaft 76, and not only simply scrapes the earth and sand in the corner of the casing 71 in the sediment transport direction, It plays the role of sending the scraped earth and sand to the stirring blade 77 side. The return blade 93 has a configuration similar to that of the stirring blade 77, but the inclination angle with respect to the rotation shaft 76 is different. As viewed from the radial direction of the rotating shaft 76, the return blade 93 has a blade surface that is inclined with respect to the rotating shaft 76 and faces forward in the rotating direction and toward the inlet 74, and is compacted to the downstream side wall surface of the casing 71. It plays a role of suppressing mixing or adding resistance to the flow of earth and sand in the vicinity of the outlet 75 to improve mixing properties.

  Next, the operation and action of the soil improvement machine configured as described above will be described.

  When soil to be reformed is put into the hopper 12 by a hydraulic excavator, a conveyor or the like, the soil received in the hopper 12 is transported toward the mixing device 19 by the transport conveyor 13. During the conveyance, the soil improvement material is supplied to the soil on the transfer conveyor 13 by the soil improvement material supply device 14, and the soil is supplied to the mixing device 19 together with the soil improvement material. These earth and sand and the soil quality improving material are uniformly mixed in the mixing device 19 by the stirring means 72L and 72R. The improved soil mixed by the mixing device 19 is discharged onto the discharge conveyor 26 and is carried out of the machine by the discharge conveyor 26.

  Here, in the case of a mixing device generally equipped with a stirring blade such as a paddle, the mixing blade has high mixing performance by cutting into the sand and crushing, while large foreign matters such as rocks and concrete glass are mixed into the sand and sand. For example, the foreign matter may be held by the surface of the stirring blade facing forward in the rotational direction, and the foreign matter may be caught in the mixing apparatus. In addition, for example, when a foreign matter having a short rigidity or length such as a string or cloth is mixed in the earth and sand, the foreign matter may be caught by the stirring blade and entangled with the rotating shaft.

  Therefore, in the present embodiment, the two stirring blades 77 adjacent on the spiral locus are connected by the connecting plate 78. By providing the connecting plate 78 in this manner, the space between the adjacent stirring blades 77 is guarded by the connecting plate 78 and the entry of foreign matter into the space between the adjacent stirring blades 77 is inhibited. It can suppress that a foreign material is caught. Therefore, the interruption time of the soil quality improvement work due to the biting or entanglement of foreign matter can be greatly shortened, and work efficiency can be improved.

  At this time, in the present embodiment, the stirring blade 77 is spirally connected by the connecting plate 78, but the connecting plate 78 is bent and the two planes 89 and 90 having different angles β and γ with respect to the rotation shaft 76 are obtained. Therefore, it is not a smoothly continuous spiral like a general screw, but a spiral in which surfaces with different angles with respect to the rotation shaft 76 are alternately connected. That is, since the plane 90 is parallel to the agitating blade 77 and can contribute to the transfer of earth and sand, the plane 90 has no or low earth-and-sand transfer capability, so that the earth and sand are transferred uniformly like a normal screw. Unlike the configuration, the stirring and transfer forces can be intermittently applied to the earth and sand with the stirring blades 77 as the center, and good mixing performance is expected. In addition, in the case of this embodiment, since the conveyance surface (blade surface) of the wing portion 85 protrudes from the conveyance surface (plane 89) of the connecting plate 78, this becomes an intermittent resistance for earth and sand conveyance, and further mixing effects are obtained. can get.

  Further, the higher the connecting plate 78 is in the radial direction (the smaller the step between the tip of the stirring blade 77 and the outer peripheral portion of the connecting plate 78), the more difficult it is for foreign matter to be caught on the stirring blade 77, but the outer peripheral portion of the connecting plate 78 wears. It becomes easy. In particular, in this embodiment, the connecting plate 78 is attached by welding. Therefore, if the connecting plate 78 is replaced, the work requires a great deal of labor, and there is a concern that the operation may be stopped for a long time. Therefore, in this embodiment, the height of the connecting plate 78 taken from the outer peripheral surface of the rotating shaft 76 in the direction of the rotating shaft diameter is made lower than the tip of the stirring blade 77 to suppress the wear of the connecting plate 78.

  When considering the height of the connecting plate 78, the bolt position on the outer peripheral side of the two bolts that fix the blade portion 85 of the stirring blade 77 or the tip portion of the rod portion 84 can be considered as an example of the reference. From the viewpoint of wear, if the outer peripheral bolt that fixes the blade 85 of the stirring blade 77 is worn, the blade 85 cannot be easily replaced. Placed. On the other hand, the cantilevered portion on the tip side of the blade portion 85 becomes longer as the bolt position on the outer periphery side moves away from the tip of the stirring blade 77 toward the rotary shaft 76 side. The bolt position on the side is better on the outside. Therefore, by design, the bolt position on the outer peripheral side for fixing the wing portion 85 is set to the outermost peripheral side within a range where the influence of wear is small.

  Therefore, the wear of the connecting plate 78 is achieved by adjusting the height of the connecting plate 78 to the position of the outer peripheral bolt that fixes the blade portion 85 of the stirring blade 77 or the tip of the rod portion 84 as in this embodiment. Can be suppressed. Even in this case, as shown in FIG. 7, the amount of protrusion of the stirring blade 77 from the outer peripheral portion of the connecting plate 78 is slightly (1/4 or less) as compared with the entire length of the stirring blade 77, and the foreign matter is restrained from being caught. The effect can be fully expected.

  Further, as a result of the connecting plate 78 being made lower than the stirring blade 77 in this way, the outer peripheral portion of the connecting plate 78 is recessed with respect to the stirring blade 77 whose tip is close to the bottom surface of the casing 71. As a result, the foreign matter mixed in the earth and sand easily escapes between the adjacent pitches through the recess (the outer peripheral side of the connecting plate 78), and synergizes with the action of guarding the space between the stirring blades 77 by the connecting plate 78. Expected to suppress tangling and catching.

  In the case of the present embodiment, the stirring blade 77 is not an integral configuration, and the blade portion 85 is detachable from the rod portion 84. Therefore, when the wing | blade part 85 wears, this can be replaced | exchanged easily. This also contributes to shortening downtime and thus improving work efficiency.

  Further, in the present embodiment, the stirring blade 77 is disposed on the two spiral trajectories S1 and S2 on the inlet 74 side of the casing 71, and is disposed on the one spiral trajectory S1 on the outlet 75 side. As a result, on the upstream side where the stirring blades 77 are closely arranged, the earth and sand are positively stirred, sufficiently mixed with the soil improvement material, and transferred to the downstream side. On the other hand, on the downstream side, both the mixing capacity and the transfer capacity are not required to be as high as the upstream side, and there is also an aspect in which the mixing ability can be improved by suppressing the transfer capacity and securing the mixing time of the earth and sand, It is not always necessary to arrange the stirring blades 77 closer to the upstream side. Therefore, by “thinning” the downstream stirring blade 77 as in the present embodiment, it is possible to more effectively suppress the biting and entanglement of foreign matter into the stirring blade 77 while ensuring the necessary mixing performance. Can do.

  Further, as in the present embodiment, by providing the baffle plate 91 on the front side in the rotation direction of the agitation vane 77 that does not have the other agitation vane on the inlet 74 side on the spiral trajectory, the baffle plate 91 and the agitation Interference of the blade 77 can be effectively avoided, and foreign matter can be prevented from being caught on the stirring blade 77.

  In the present embodiment described with reference to FIG. 1 to FIG. 13, a configuration in which two stirrer blades 77 are provided on the upstream side of the casing 71 while a single streak blade 77 is thinned on the downstream side is employed. It is not necessary to change the arrangement density between the upstream side and the downstream side of the casing 71. That is, as illustrated as another configuration example in FIG. 14, both the left and right stirring means 72L and 72R have a predetermined pitch on the two spiral trajectories S1 and S2 from the inlet 74 (see FIG. 5) to the outlet 75 (same). The present invention can be applied even when the stirring blades 77 are arranged at a pitch of 90 degrees in the example, and the corresponding effects can be obtained. Needless to say, the number and pitch of the stirrer blades 77 are different depending on the required mixing ability, transfer ability, etc., and can be appropriately changed in design. In FIG. 14, the number is two, but it may be one or more than three if necessary. The pitch is not limited to a 90-degree pitch and can be adjusted as appropriate, and the pitch can be changed between the upstream side and the downstream side.

  In the above embodiment, the plane 90 on the inlet 74 side of the casing 71 of the connecting plate 78 has been described as an example, but the angle β between the planes 89 and 90 of the connecting plate 78 has been described. , Γ, and β <γ ≦ 90 °, the plane 90 may be slightly inclined with respect to the rotation shaft 76.

  Further, the stirring blade 77 is composed of the rod portion 84 and the blade portion 85, but may be integrated, for example, a configuration in which a part of the rod portion is cut out to form a blade surface, and the flat surface of the plate-like rod portion is a blade. The configuration may be a plane. In this case, the connecting plate 78 may be attached so that the flat surfaces 89 and 90 thereof are connected to the blade surface of the stirring blade, or may be attached so that the blade surface protrudes from the flat surfaces 89 and 90 to the outlet 75 side. It is done. When the flat surfaces 89 and 90 of the connecting plate 78 are connected to the blade surface of the stirring blade, a configuration in which the stirring blade and the connecting plate are integrated can be assumed. For example, the screw blades are bent in a zigzag shape so that surfaces having different angles with respect to the rotation shaft 76 are alternately connected to each other, and this is attached to the rotation shaft as a stirring means. In the case of this configuration, a part of the plane of the screw blade with strong earth and sand feeding action corresponds to the stirring blade (blade surface), and the other part corresponds to the connecting plate. The portion corresponding to the connecting plate is preferably formed with a recess (described above) through which foreign matter passes by forming the outer peripheral portion lower than the portion corresponding to the stirring blade.

  Moreover, although the case where the connecting plate 78 has two planes 89 and 90 has been described as an example, the connection plate 78 has three or more planes depending on the circumstances as long as it does not depart from the technical idea of the invention. The design can be appropriately changed to the configuration. For example, a configuration in which another plane is interposed between the planes 89 and 90 is also within the scope of the technical idea of the present invention.

  Furthermore, in the above, the case where this invention was applied to the mixing apparatus 19 of the soil improvement machine in which earth and sand are directly injected into the hopper 12 was described as an example. In this case, since the foreign matter mixed in the earth and sand is easily supplied to the mixing device 19, the effect of the application of the present invention is great. However, the present invention can also be applied to a soil improvement machine provided with a vibrating (or fixed) sieve that removes foreign matter in the sand at the upper part of the hopper, and the effect of suppressing the catching of foreign matter is naturally expected. . Moreover, although the case where the present invention was applied to the mixing device 19 of the soil improvement machine provided with the crawler type traveling device having the crawler belt 7 was described as an example, the soil improvement machine provided with the so-called wheel type traveling device There may be. The present invention is also applicable to a mixing device provided in a fixed soil improvement machine that does not have a self-propelled function. In these cases, the same effect is obtained.

19 Mixer 71 Casing 72L, R Stirring means 74 Inlet 75 Outlet 76 Rotating shaft 77 Stirring blade 78 Connecting plate 84 Rod portion 85 Wing portion 89, 90 Plane 91 Fouling plate S1, Spiral trajectory α, β, γ angle

Claims (5)

In the mixing device of the soil improvement machine that mixes earth and sand,
A casing having an inlet for earth and sand at the upper part on one side in the longitudinal direction and an outlet at the lower part on the other side;
A rotating shaft extending longitudinally within the casing;
A stirring blade arranged on a spiral locus on the outer periphery of the rotating shaft;
A fan-shaped connecting plate for connecting adjacent stirring blades on the spiral locus;
The connecting plate has at least two planes having different angles with respect to the rotating shaft when viewed from the radial direction of the rotating shaft, and is formed to be lower in height from the outer peripheral surface of the rotating shaft than the stirring blade. The mixing device of the soil improvement machine characterized by being characterized.   The soil improvement machine according to claim 1, wherein the plane of the connecting plate on the outlet side of the casing has a larger mounting angle with respect to the rotating shaft than the plane of the casing on the inlet side. Mixing equipment.   3. The mixing device of the soil improvement machine according to claim 2, wherein the plane on the outlet side of the casing is inclined along the blade surface of the stirring blade to which the plane is connected, and the plane on the inlet side of the casing is on the rotating shaft. A mixing device of a soil conditioner characterized by being along orthogonal planes.   The mixing apparatus of the soil conditioner according to any one of claims 1 to 3, wherein the spiral locus in which the stirring blade is disposed has two strips on the inlet side and one strip on the outlet side of the casing. .   The mixing device of the soil improvement machine according to any one of claims 1 to 4, wherein the stirring blade is disposed on the front side in the rotation direction of the stirring blade disposed on the most inlet side of the casing on the spiral locus from the stirring blade to the rotating shaft. A mixing device for a soil improvement machine, characterized by providing a fan-shaped relief plate.

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