JP3409181B2 - Rotary projection spraying equipment for concrete mixed materials - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotary projection type spraying device for concrete mixed material, which is mainly used as a lining device for tunnels.

[0002]

2. Description of the Related Art A device that uses compressed air to spray a mixed material of concrete and a quick-setting agent from a nozzle onto an excavated wall surface of a tunnel or the like causes environmental deterioration due to dust and rebound, and therefore concrete is rotated and projected. A device has been proposed.

One example is the invention disclosed in Japanese Patent Laid-Open No. 7-180496. In this invention, the concrete and the quick-setting admixture are agitated and mixed by a screw conveyor, transferred to a rotary projection unit, and concrete is sprayed onto a wall surface or the like from a projection port of the rotary projection unit rotating at high speed by centrifugal force. The rotary projection unit is composed of a pair of opposing main pulleys having vane plates arranged in a gap, a plurality of auxiliary pulleys arranged around the main pulleys, and an endless belt wound around the outer circumferences of the main and auxiliary pulleys. The main pulley having the vane plate is rotated by driving at least one auxiliary pulley.

The applicant of the present invention has also proposed a device of the same type in Japanese Patent Application No.
-980180. As shown in the schematic configuration diagram of FIG. 14, this device comprises a rotating and stirring cylinder A having a substantially truncated cone shape, and a high-speed rotating impeller which is opposed to the large diameter end B of the stirring and mixing cylinder A in close proximity to each other. With C and. A rotating shaft D is arranged along the center line in the stirring and mixing cylinder, and a stirring rod E is fixed to the peripheral surface of the rotating shaft. Therefore, the concrete a and the quick-setting admixture b, which have been individually fed, are kneaded by the rotation of the stirring rod E in the stirring / mixing cylinder, and the gravity and the rotation accompanying the inner surface inclination of the stirring / mixing cylinder A By centrifugal force, it is guided to the edge of the large-diameter end portion B along the inclined inner surface of the stirring and mixing cylinder A, and is discharged from this edge toward the blade plate F of the impeller C and projected in a predetermined projection direction. It

[0005]

[Patent Document 1] Japanese Patent Application Laid-Open No. 7-18049
In the case of the invention of No. 6, since concrete and the quick-setting admixture are transferred while being stirred and mixed by a horizontally arranged screw conveyor, concretes remain on the screw conveyor and solidify, and the transfer route tends to be clogged. Become. Also,
The endless belt of the rotary projection unit must give a rotational force to the main pulley against the weight load of the concrete and the rotational centrifugal load, and is required to have a great strength.

According to the invention of Japanese Patent Application No. 10-980180, the mixed material of the concrete a and the quick-setting admixture b is discharged to the outside through the inner surface of the taper by the centrifugal force of the stirring and mixing cylinder A, and the stirring rod E is also driven to rotate. Therefore, the concrete mixed material can be projected to the outside by the inertia force immediately after the operation is stopped and by the idle operation immediately before the operation, and the mixed material can be projected on the inner surface of the stirring / mixing cylinder A, the stirring rod E, etc. It becomes difficult for the residue to adhere, and the solidification phenomenon as in the invention of JP-A-7-180496 can be avoided. In addition, the impeller C has an endless belt that cooperates with the vane F to convey the mixed material at high speed to the projection port on the outer peripheral surface excluding the direction of the projection port. The driving force is received by the rotation driving means. Therefore, an endless belt is disclosed in Japanese Patent Laid-Open No. 7-
It does not require the strength required by No. 180496.

However, Japanese Patent Application No. 10-980180
According to the invention, since the opening edge of the large diameter portion B of the stirring and mixing cylinder that discharges the mixed material faces the peripheral surface of the impeller C or the substantially central portion of the blade plate F in the left-right width direction as shown in the figure, The discharged mixed material is concentrated and received only on a part of the plate surface of the impeller blade plate F, and is projected to the outside.
Therefore, for example, even if a blade plate F having a large lateral width is used for a large-capacity device, one blade plate F
The position of receiving the mixed material is substantially unchanged, and a large amount of mixed material cannot be projected efficiently.

Further, since the horizontal width of the projection area f of the mixed material received by the vane plate F is narrow, the spraying area tends to be concentrated in a part, and particularly in the case of a large capacity, it is narrow and round. The state of being raised becomes noticeable. As a result, the spread in the left-right direction is not uniform, and rebound easily occurs. Furthermore,
In the vicinity of the upper portion of the projection port, a guide member (see the above-mentioned JP-A-7-18
No. 0496) or a scraper member to regulate the projection direction of the mixed material or to prevent the projection area from spreading in a fan shape, the viscous mixed material adheres to these guide members and scraper members, accumulate. As a result, the projection opening becomes narrow, which hinders the spraying of the projection.

It is an object of the present invention to provide a rotary projection spraying device which is unlikely to consolidate mixed materials and the like in the stirring and mixing means, and which is capable of efficiently projecting the mixed materials even with a particularly large capacity device. It is in. Another object of the present invention is to provide a rotary projection type spraying device capable of widening the horizontal width of the projection area and widening the spraying area to ensure a uniform spraying area. Especially. Further, another object of the present invention is to provide a rotary projection type spraying device which, in addition to the above objects, is unlikely to cause the mixed material to adhere to the scraper member of the projection port and can maintain good spraying.

[0010]

The present invention is characterized in that it has the following constitution in order to achieve the above object. That is, in the invention of claim 1, the concrete and the quick-setting agent which are individually fed by the feeding means are stirred and mixed by the stirring and mixing means, and the concrete mixed material discharged from the stirring and mixing means is provided on the rotary projection means. It is an improvement of the rotary projection type spraying device for concrete mixed material, which is received by the blade plate and projected in a predetermined direction from the projection opening.
A liquid or powder is used as the quick-setting agent. The rotary projection means winds a part of the endless belt-like material on the outer peripheral surface of the impeller having a plurality of vane plates in a state where the direction of the projection port is opened, and the other end of the endless belt-like material is placed outside the peripheral surface of the impeller. It is hung over a number of travel guide members located at. The stirring and mixing means includes a stirring and mixing cylinder having a substantially truncated cone shape and a stirring member that rotates in the stirring and mixing cylinder. In the stirring and mixing cylinder, the small-diameter end portion is communicated with the supply means, while the large-diameter end portion from which the mixed material is discharged is formed with a cutout portion for partially shifting the mixed-material discharge position toward the small-diameter end portion. The large-diameter end portion including the cutout portion faces the blade plate of the rotary projection means. The stirring member has a rotating shaft arranged along the axis of the stirring and mixing cylinder, and a stirring rod projecting around the circumference of the rotating shaft. And
By rotating the rotating shaft, the stirring rod, and the stirring / mixing cylinder by the rotation driving means, the concrete and the quick-setting agent are mixed in the stirring / mixing cylinder to be guided to the large-diameter end portion, and the large-diameter end portion having the cutout portion. From which the mixed material is discharged to the vane plate of the rotary projection means.

The cut portion formed at the large-diameter end portion of the stirring and mixing cylinder is constituted by, for example, a large number of notches each having an appropriate shape and continuous at a predetermined pitch. Move the large diameter end of the stirring and mixing cylinder back gently from the reference position toward the small diameter end,
By forming a step edge that returns to the reference position at a position of approximately ½ in the circumferential direction, the retreat area may be used as the cutout portion. In any case, if the discharge position of the mixed material is partially shifted toward the small-diameter end on the edge of the large-diameter end,
It constitutes the excision part.

The rotary projection means comprises an impeller and an endless strip. Rotational driving force in the forward direction or the reverse direction is applied to the impeller, and the endless strip material cooperates with the vane plate to convey the mixed material as the impeller rotates. Of course, a guide member that guides the traveling of the endless belt-shaped member may be rotationally driven and the rotational force may be transmitted to the impeller through the endless belt-shaped member. It is desirable to provide a guide plate for projecting the mixed material in the vicinity of the projection port and above the traveling guide member that allows the endless belt-shaped material to be taken over by the impeller.

According to the second aspect of the present invention, a pitch angle is provided in a part of a large number of blades of the rotary projection means. When providing a pitch angle, a reference vane plate extending in a direction orthogonal to the center line of the impeller peripheral surface, a left slanting vane plate having a pitch angle of left slanting with respect to the reference vane plate, and a reference vane plate It is desirable to combine it with a right inclined vane plate having a right inclined pitch angle. The left and right inclined blade plates are alternately attached to the impeller peripheral surface with the reference blade plate interposed therebetween.

In the invention of claim 3, the blade of the rotary projection means is provided with a receding angle with respect to the rotational direction. The degree of backward tilt is appropriately set in consideration of the viscosity of the mixed material, the centrifugal force of the impeller, the length from the base end to the tip of the blade plate, and the like.
Both the pitch angle and the receding angle described above may be provided on the vane plate. In the invention of claim 5, the scraper member is provided in the vicinity of the projection port and in front of the traveling guide member that takes over the endless belt-shaped member immediately after being separated from the impeller. Then, a vibration generating means for vibrating the scraper member is attached to the scraper member. The vibration generating means may be of any type, mechanical or physical. Further, in the invention of claim 11, a guide plate for projecting the mixed material is provided in the vicinity of the projection port and above the traveling guide member for allowing the impeller to take over the endless belt-shaped material. The guide plate is mounted, for example, so that the projection direction is the other travel guide member of the projection port, that is, the travel guide member that succeeds the endless strip immediately after being separated from the impeller, is shifted to the tip, and is inclined upward. ing.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the illustrated embodiments. FIG. 1 is a side view showing a partial cross section of a main part of an apparatus according to an embodiment of the present invention, and FIG. 2 is a front view of the same. Reference numeral 1 in the figure is a supply pipe for supplying concrete to the stirring and mixing cylinder 3, and a supply pipe 2 for the quick-setting agent is incorporated in the center. The opening of the tip of the quick-setting agent supply pipe 2 projects further than the tip of the concrete supply pipe 1. The method of supplying the quick-setting agent does not matter whether it is a screw type or a pressure feeding type. In order to feed the quick-setting admixture, a known fixed-quantity supply device (not shown) such as a constant-rate pump, a rotating coil or a feeder is used according to the supply system.

Reference numeral 3 denotes an agitating and mixing cylinder having a substantially truncated cone shape. The small diameter end 4 is located inside and the large diameter end 5 is located outside. , 2 are arranged between the two. The small-diameter end 4 is fixed to the tip of an inner rotary cylinder 6 that covers the outer circumference of the concrete supply pipe 1, and communicates with both the supply pipes 1 and 2. The inner rotary cylinder 6 has a base end portion connected to the first motor 7 via a gear 8. The stirring and mixing cylinder 3 and the inner rotary cylinder 6 receive the driving force of the first motor 7 and rotate integrally. On the large-diameter end portion 5 of the stirring and mixing cylinder 3, triangular notches 9 are continuously formed at intervals in the circumferential direction as shown in FIG. The notch 9 is located at the outermost end 5a of the large-diameter end 5 at the discharge position of the mixed material.
It is for partially shifting from the direction toward the small diameter end.

Reference numeral 10 is a rotary shaft arranged on the central axis of the stirring and mixing cylinder, and the outer end of the disk-shaped outer surface plate 1 of the impeller 13 is provided.
It is fixed to the inner surface of No. 4. On the inner end side of the rotary shaft 10, a rotary blade 11 is mounted which faces the tip of the quick-setting agent supply pipe 2 and scatters the quick-setting agent sent out. A large number of stirring rods 12 are radially provided on the circumference of the rotary shaft 10 at appropriate intervals in the axial direction of the rotary shaft 10. The length of each stirring rod 12 is set so that the tip thereof maintains a gap of substantially the same size as the inner circumferential surface of the stirring and mixing cylinder 3.

As shown in FIGS. 1 and 2, the impeller 13 includes eight vane plates 16 fixed between a disc-shaped outer surface plate 14 and a ring-shaped inner surface plate 15 at an interval of about 45 degrees. Have. The blade plate 16 has a plate surface extending along the radial direction of the impeller 13. The large-diameter end portion 5 of the stirring and mixing cylinder 3 passes through the inner edge of the ring-shaped inner surface plate 15 and enters the impeller. Outermost end 5a of large-diameter end 4 of agitation mixing cylinder 3 and cutout 9
Is in a position close to the vane plate 16 and faces the vane plate 16 so that the mixed material discharged from the large-diameter end portion 5 is inherited by the vane plate 16. The ring-shaped inner surface plate 15 of the impeller 13 is
It is fixed to the tip of a housing 17 that covers the stirring and mixing cylinder 3. The base end of the housing 17 is fixed to the tip of the outer rotary cylinder 18. The base end of the outer rotary cylinder 18 is a gear 19
Is connected to the second motor 20 via. Upon receiving the driving force of the second motor 20, the impeller 13 and the rotating shaft 10 for stirring integrally rotate.

Reference numerals 21 to 25 are five guide rollers arranged so as to surround the outer circumference of the impeller 13 (see FIG. 2), and are wound around the outer circumference of the impeller 13 except for the peripheral surface in the direction of the projection port 26. The rest of the endless belt 27 is hung over,
Guide the running of the endless belt 27. 5 guide rollers 2
Of the 1 to 25, the two rollers 21 and 22 have the projection port 26.
Are provided so as to face each other. One roller 22
Is an introduction roller that is located below the projection port 26 and guides the endless belt 27 to the impeller circumferential surface. The other roller 21 is located above the projection port 26 and does not support the endless belt 27 after projection. It is a return roller that returns to the guide rollers 23 to 25. A guide plate 28 that guides the projection of the mixed material is attached above the introduction roller 22. Also,
A scraper 29 is attached to the front of the return roller 21. The scraper 29 prevents the mixed material adhering to the conveying surface of the endless belt 27 from going around the return roller peripheral surface together with the endless belt 27 and spreading and projecting by the centrifugal force of the return roller 21. A vibration generator 30 is attached to the scraper 29. The vibration generator 30 is operated during operation of the projection device to return the mixed material, which tends to adhere to the scraper plate surface, to the projection flow f.

The present apparatus is equipped with a frame (not shown) at the base end of the supply pipe, and is mounted on a base machine or the like which can be self-propelled through this frame. In addition, reference numeral 31 in the figure
Since the position of the projection port 26 is changed by rotating the substrate 35 supporting the guide roller and the like, a third motor for rotation mounted on the exterior housing 32, 33 and 34 are the inner rotary cylinder 6 and the outer rotary cylinder 18. And the outer rotary cylinder 18 and the exterior housing 32, respectively. Also, the first to third motors 7, 2
Although 0 and 31 may be electric motors, it is preferable to use hydraulic motors.

The operation will be described. The concrete a and the quick-setting admixture b are fed to the small-diameter end portion 4 of the stirring and mixing cylinder 3 through the supply pipes 1 and 2. The stirring and mixing cylinder 3 is rotated by receiving the driving force of the first motor 7. Therefore, the concrete a extruded into the small-diameter end portion receives the acting force of the horizontal component force due to the centrifugal force of the agitating and mixing cylinder 3 and the gravitational acting force by the taper surface, and moves to the large-diameter end portion 5 of the agitating and mixing cylinder 3. And transition. On the other hand, the quick-setting admixture b, which is quantitatively supplied to the small-diameter end portion 4, is discharged, and at the same time, the inner end of the rotating shaft comes into contact with the rotary blade 11, and
It is scattered radially toward the flowing concrete a on the inner wall surface of the stirring and mixing cylinder 3. Then, it is kneaded with the concrete a by the stirring rod 12. The stirring rod 12 is rotated at a higher speed than the stirring and mixing cylinder 3 to stir and mix the concrete a and the quick-setting admixture b. The rotation speed of the stirring rod 12 and the stirring / mixing cylinder 3 determines the speed at which the concrete or the mixed material moves in the stirring / mixing cylinder, and the residence time in the stirring / mixing cylinder is also determined.

While the stirring and mixing cylinder itself rotates, the stirring rod 12 stirs and mixes the concrete a and the quick-setting admixture therein, so that the mixed material of the concrete a and the quick-setting admixture b is mixed in the stirring and mixing tube. It does not stay locally and is unlikely to solidify. When the operation is stopped, the mixed material in the stirring / mixing cylinder is forced to the large-diameter end portion 5 by the idle operation or by the residual inertia force of the rotating shaft 10 and the stirring / mixing cylinder 3 without performing the idle operation. Since it is induced and released, it hardly remains in the stirring and mixing cylinder. Further, since the fixed amount of the quick-setting admixture b is scattered radially, the concrete a and the quick-setting admixture b are uniformly mixed. Even if the concrete aggregate is caught between the tip of the stirring rod 10 and the inner wall surface of the stirring and mixing cylinder 3 during the stirring and mixing operation, since the inner wall surface is a tapered surface, the aggregate is a gap. It is relatively easy to escape from the above, and it is difficult for abrasion of the stirring rod 12 and load on the second motor 20 to occur.

The large-diameter end portion 5 is transmitted along the inner wall surface of the stirring and mixing cylinder 3.
The mixed material guided to (1) passes over the edge of the large-diameter end portion 5 and is discharged into the impeller internal space surrounded by the disc-shaped outer surface plate 14, the endless belt 27, and the vane plate 16. The discharged mixed material is received by the blade 16 and projected from the projection port 26. The large-diameter end portion 5 of the stirring and mixing cylinder 3 has a large number of notches 9. Therefore, the mixed material is the agitating and mixing cylinder 3
Along with the rotation, the outer diameter of the large-diameter end 5 is passed over the notch 9 and the outermost end 5a and discharged to the impeller 13. Notch 9
The edge of the mixed material is displaced from the outermost end 5a of the large-diameter end portion 5 toward the small-diameter end portion, so that the mixed material is spread in the lateral direction of the blade plate 16 of the impeller 13 as shown in FIG. It is also released into the air, and the amount released per unit time also increases. The vane plate 16 projects the mixed material received in a wider area than in the case of the conventional stirring and mixing cylinder (see FIG. 13). The spraying area inevitably becomes wider. As a result, the mixed material can be efficiently projected even with such a large-capacity device.

The projection port 26 is bounded by a guide plate 28 and an endless belt conveying surface facing the guide plate 28. The mixed material adhering to the endless belt conveyance surface is returned to the return roller 2
It is scraped off by the scraper 29 before making a U-turn by 1. The scraper 29 is a vibration generator 30.
Since it vibrates, the mixed material scraped off or the mixed material of the projection flow is unlikely to adhere to the plate surface. Moreover, even if they adhere, the growth is hindered by the vibration.
If the scraper 29 with the vibration device is not provided, as shown in FIG. 5, the mixed material remaining on the endless belt conveyance surface is scattered by the centrifugal force when traveling on the peripheral surface of the small-diameter return roller 21 ( (Dashed line arrow in the figure). Therefore, in addition to the original spraying area R due to the mainstream of projection, the diffusion spraying area r is formed to be displaced upward. In the case of this device, as shown in FIG. 6, since the scraper 29 prevents such diffusion spraying, the spraying area has a converging property.

FIG. 7 shows a case where the notch 49 formed in the large-diameter end portion 45 of the stirring and mixing cylinder 43 has a rectangular shape. The notch may have any shape, such as a rectangular shape, a semicircular arc shape, or a U shape, as long as it does not hinder the discharge of the mixed material. Further, the cutout portion may be a cutout portion that partially shifts the end edge of the large diameter end portion toward the small diameter end portion. FIG. 8 shows an example of the excision portion 59 which replaces the cutout portion. An edge of the large-diameter end 55 has a step edge 55b that gradually retreats from the outermost end, which is the reference position, in the direction of the small-diameter end, and returns to the reference position at a position of approximately 1/2 in the circumferential direction. The retreat area portion becomes the excision portion 59. In the stirring and mixing cylinder 53 according to this embodiment, since the edge of the cutout portion 59 has a gentle slope, the mixed material can be discharged smoothly and uniformly.

FIGS. 9 and 10 show a front view of the main part of the apparatus and a side view of the impeller blade plate showing an example of the invention in which the horizontal projection width of the mixed material is further widened and more uniform projection is possible. Is. In the present invention, a part of the impeller vane plate is provided with a pitch angle. As shown in FIG. 9, the impeller has twelve blades 116. 12 blades 1
16 is divided into three types (116a, 116b, 116c). The six blades are normal blade plates 116b whose right and left ends are on a line that intersects the impeller peripheral surface at a right angle. Of the remaining six, three are right inclined blade plates 116a in which the line connecting the left and right ends is inclined downward to the right with respect to the normal blade,
The rear three blades are three left inclined blade plates 116c in which the line connecting the left and right ends is inclined to the left. The left and right pitch angles are, for example, about 20 degrees.

Left tilted blade plate 116a and reference blade plate 116
The three types of blade plates 116, b and the right inclined blade plate 116c,
They are sequentially arranged in the impeller circumferential direction. The left and right inclined vane plates 116a and 116c are circumferentially opposed to each other with the normal reference vane plate 116b interposed therebetween. The other members adopt the same structure as the device shown in FIGS.

Therefore, when the impeller 113 rotates, each vane plate 116 projects the mixed material received on the plate surface in a direction orthogonal to the line connecting the left and right ends of the mixed material by centrifugal force. The reference blade 116b projects the mixed material in the direction indicated by the arrow X, the preceding right inclined blade 116a in the direction indicated by the arrow Y, and the subsequent left inclined blade 116c in the direction indicated by the arrow Z (see FIG. 10). As a result, with respect to the projection direction of the reference vane plate 116b, the right inclined vane plate 116a projects the mixed material in a direction inclined to the right by about 20 degrees, and the left inclined plate 116c projects the mixed material in a direction inclined to the left by about 20 degrees. To do. By alternately continuing each projection, the mixed material is sprayed on the area spread by 20 degrees to the left and right. Moreover, since the image is projected from the right to the center, to the left, and then back to the center and to the right again, the surface of the spraying area looks more natural than when concentratedly projected only in the center. The sprayed cross section also has a substantially trapezoidal shape and becomes uniform. Along with this, the rebound also decreases. Especially, it is effective when a large volume of equipment is used to project a large amount of mixed material.

It is also possible to combine only one inclined blade plate with the reference blade plate as the blade plate having the pitch angle. In this case, the spread of the projection area and the spraying area is narrower than that of the above-mentioned example having the left and right inclined blade plates, but the difference is remarkable as compared with the conventional one using only the reference blade plate. .

FIG. 11 and FIG. 12 are a front view of the main part of the apparatus and a side view of the impeller blade plate showing the invention in which the blade plate has a receding angle. In this invention, all the 12 blades are provided with a receding angle. Further, as in the inventions of FIGS. 9 and 10, pitch angles are provided on the six blade plates. Therefore,
The left and right inclined blade plates 216a and 216c have a pitch angle and a receding angle. The receding angle is about 15 degrees. Note that the other members of this apparatus adopt the same configuration as the embodiment of FIGS.

The vane plate 216 projects the mixed material received by the impeller from the projection opening by the centrifugal force that accompanies the high speed rotation of the impeller. At this time, the mixed material is projected from the position near the outer end while sliding on the plate surface of the blade plate 216 from the inner peripheral direction of the impeller to the outer peripheral direction. Therefore, the mixed material in the vicinity of the outer end of the vane plate 216 and the mixed material in the position near the inner end of the blade plate 216 are displaced from each other in the projection timing. The higher the viscosity of the mixed material, the greater this deviation becomes, making it difficult to perform uniform spraying. In a large-capacity device in which the size from the inner edge to the outer edge of the blade is set to be large, such a problem becomes particularly remarkable. The blade plate 216 having a receding angle facilitates sliding movement of the mixed material in the region from the middle to the inner end toward the outer end. As a result, the timing deviation is minimized, and in particular, uniform spraying is achieved in a large capacity device.

FIG. 13 shows the peripheral portion of the projection opening of the apparatus according to still another embodiment of the present invention. In this embodiment,
A guide plate 128 provided close to the introduction roller 22 is attached so as to be inclined with respect to the original projection direction. The inclination is for the return roller 21 to move the projection direction to the crocodile, and the tip is raised toward the return roller 21 in the figure. The mixed material projected by the vane plate has its projection direction corrected upward by the surface of the guide plate 128. In the figure, the two-dot chain line shows the original projection flow direction, and the one-dot chain line shows the corrected flow direction. The mixed material (mainly mortar) adhering to the conveying surface of the endless belt 27 toward the return roller 21 is scattered by the centrifugal force when the return roller rotates, for example, about 30 degrees. The modified stream of mixed material is entrained by the adhering mortar and mixed with it, and is blown forward. Since the mixed material also passes through the guide plate 128 by rubbing its surface, the mixed material deposits on the guide plate due to the aggregate contained therein.
Growth is hindered. As a result, it is not necessary to additionally install a scraper or a vibration generator as shown in the embodiments of FIGS. 1 and 2, and the structure of the periphery of the projection port can be simplified. The inclination angle of the inclined plate is set to an appropriate angle depending on the viscosity of the mixed material, the rotation speed of the impeller and the traveling guide member, and the like. It is desirable to provide a tilt angle adjusting means.

[0033]

According to the present invention, the cement and the quick-setting admixture are subjected to a horizontal component force due to a centrifugal force and a gravity force due to a tapered surface in a rotating stirring and mixing cylinder having a substantially truncated cone shape. Since the mixture is stirred and mixed by the stirring means while being fed, the mixed material is prevented from locally staying in the stirring and mixing cylinder, and the solidification can be prevented. Moreover, since the mixed material is discharged to the impeller from the large-diameter end of the stirring and mixing cylinder having a partially cut portion, it is possible to project a large amount of the mixed material widely accepted in the left and right widths of the impeller blade plate, and to blow it. It is possible to give spread and uniformity to the attachment area.

According to the inventions of claims 2 and 4,
Since a pitch angle is provided on a part of the blades, a wide range of dispersed projection is possible in the left-right direction, and the spraying surface can be kept relatively flat.

According to the inventions according to claims 3 and 4,
Since the blade plate is provided with the receding angle, it is possible to reduce the deviation of the projection timing of the mixed material at the front and rear positions of the blade plate, which further contributes to uniform projection.

Further, according to the invention of claim 5, since the scraper is provided at the projection port and the scraper is vibrated, the mixed material can be prevented from being scattered and projected upward from the projection port. Not only can the mixed material be prevented from adhering to the plate surface of the scraper, the projection can be kept in a uniform state.

Further, according to the invention of claim 11, the concrete mixed material adhered to the endless belt material, mainly mortar, is provided with a simple structure without providing a scraper.
It can be projected as if it were involved in the modified projection flow of the mixed material.

[Brief description of drawings]

FIG. 1 is a side view showing a cross section of a main part of an apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of the device of FIG.

3 is a schematic perspective view of a stirring and mixing cylinder used in the apparatus of FIG.

FIG. 4 is an explanatory view showing the action of the cutout portion of the stirring and mixing cylinder of FIG. 1.

5 is an explanatory view showing a projection situation when the apparatus of FIG. 1 is not provided with a scraper.

6 is an explanatory view showing a projection situation when a scraper is provided in the apparatus of FIG.

FIG. 7 is a schematic perspective view showing another example of a cutout portion formed at the large-diameter end portion of the stirring and mixing cylinder.

FIG. 8 is a schematic perspective view showing an example of a cutout portion formed at a large-diameter end portion of a stirring and mixing cylinder.

FIG. 9 is a front view of an essential part of the device in which a blade plate is provided with a pitch angle.

FIG. 10 is a side view of the vane plate in the apparatus of FIG.

FIG. 11 is a front view of a main part of the device in which the blade plate has a receding angle.

12 is a side view of a vane plate in the apparatus of FIG.

FIG. 13 is an explanatory diagram showing a peripheral portion of a projection opening of an apparatus according to another embodiment of the present invention.

FIG. 14 is a schematic configuration diagram showing a main part of a device of the same type as the present device according to the prior application.

[Explanation of symbols]

1 Concrete supply pipe 2 Quick-setting agent supply pipe 3,43,53,113,213 Stirring and mixing cylinder 4 Small diameter end 5,45,55 Large diameter end 5a Outermost end of large diameter end 6 Inner rotating cylinder 7 First motor 9,49 Notch 10 rotation axis 11 rotating blades 12 stirring rod 13 Impeller 14 Disc-shaped outer plate 16,116,216 blades 116a Right inclined blade plate 116b Standard blade 116c Left slant blade 216 Blade plate with receding angle and pitch angle 17 housing 18 Outer rotary cylinder 20 second motor 21 Return roller 22 Introducing roller 23-25 Running guide roller 26 Projection port 27 Endless belt 28,128 Guide plate 29 scrapers 30 Vibration generator 59 excision part

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-180496 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11/10

Claims (11)

(57) [Claims] 1. The concrete and the quick-setting agent, which are individually fed by the feeding means, are agitated and mixed by the agitating and mixing means,
Concrete mixing material discharged from the stirring and mixing means,
In a rotary projection type spraying device of concrete mixed material, which receives in a predetermined direction from a projection port while being received by a blade plate provided in a rotary projection means, the rotary projection means is an outer peripheral surface of an impeller having a plurality of blade plates. A part of the endless belt-shaped material is wound around in a state where the direction of the projection opening is open, and the other end of the endless belt-shaped material is hung over a large number of traveling guide members located outside the peripheral surface of the impeller, The stirring / mixing means includes a substantially frustoconical stirring / mixing cylinder and a stirring member rotating in the stirring / mixing cylinder. The stirring / mixing cylinder makes the small-diameter end communicate with the supply means while discharging the mixed material. A large-diameter end portion is formed with a cutting portion for partially displacing the edge for discharging the mixed material toward the small-diameter end portion, and the large-diameter end portion including the cutting portion is made to face the blade plate of the rotary projection means. Yes, and the stirring member is a stirring and mixing cylinder. A rotating shaft disposed along the axis of the rotating shaft and a stirring rod projecting around the circumference of the rotating shaft. By rotating the rotating shaft, the stirring rod, and the stirring / mixing cylinder by the rotation driving means, While mixing in the stirring and mixing cylinder and the quick-setting agent to the large-diameter end, the mixed material is discharged from the large-diameter end having the cutout portion to the blade plate of the rotating projection means, rotation of the concrete mixed material Projection type spraying device. 2. The rotary projection type spraying apparatus according to claim 1, wherein a pitch angle is provided in a part of a large number of blades of the rotary projection means. Attachment device. 3. The rotary projection type spraying device for the concrete mixed material according to claim 1, wherein the blade plate of the rotary projection means is provided with a receding angle with respect to the rotation direction. 4. The concrete mixing system according to claim 1, wherein the blades of the rotary projection means are provided with a receding angle with respect to the rotation direction and a part of the blades is provided with a pitch angle. A rotary projection sprayer for materials. 5. The rotary projection-type spraying device according to claim 1, wherein a scraper member is provided in the vicinity of the projection port and in front of the traveling guide member that takes over the endless strip immediately after being separated from the impeller. A rotating projection type spraying device for concrete mixed material, which vibrates this scraper member by means of vibration generating means. 6. The cutout portion formed at the large-diameter end portion of the stirring and mixing cylinder is a large number of notches each having an appropriate shape and continuous at a predetermined pitch. Rotating projection type spraying device. 7. The large-diameter end portion of the agitating and mixing cylinder has a step edge that gently retreats from the reference position toward the small-diameter end portion and has a step edge that returns to the reference position at about a half position in the circumferential direction. The rotary projection type spraying device according to any one of claims 1 to 5, wherein a retreat area is the excision portion. 8. A vane plate of an impeller, the reference vane plate extending in a direction orthogonal to a center line of an impeller peripheral surface, and a left slanting vane plate having a pitch angle of left slanting with respect to the reference vane plate, A right slant blade having a pitch angle of right slant with respect to the reference blade, and these left and right slant blades are alternately attached to the impeller peripheral surface with the reference blade sandwiched therebetween. The rotation projection type spraying device according to 3 or 4. 9. The rotary projection type spraying according to claim 1, wherein a guide plate for projecting the mixed material is provided in the vicinity of the projection port and above the traveling guide member for passing the endless belt-shaped material to the impeller. apparatus 10. The rotary projection means according to claim 1, wherein the impeller is rotated by receiving a driving force, and the endless belt-shaped member travels between the outer peripheral surface of the impeller and the guide member as the impeller rotates. Rotating projection type spraying device. 11. The rotary projection type spraying according to claim 9, wherein the guide plate is tilted so that a traveling guide member for taking over the endless belt material immediately after the projection direction is separated from the impeller is shifted to the edge. apparatus.