JPH0575453B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for supplying fine particulate ice or snow.

<Conventional technology> When mixing concrete, the method of mixing it with water and using ice has traditionally been used. Specifically, a sliced ice machine or the like is installed as a temporary plant next to the fresh concrete, and sliced ice is supplied together with water during concrete mixing.

However, when the outside temperature rises seasonally or in tropical regions, the mixed ready-mixed concrete also becomes quite hot, so this method uses a large surface area for the purpose of simply cooling the mixed concrete. It only supplies sliced ice and is not suitable for cement kneading at room temperature.

For example, JP-A-61-49806 discloses that high-strength concrete can be produced by supplying fine ice for cement mixing. Specifically, when preparing hydraulic cementitious compositions such as mortar and concrete, if fine granular ice or fine granular snowpack (for example, particle size of 1 m/m to 5 m/m) is used instead of water, cement Even kneading can be achieved even if the amount of water supplied is reduced to close to the amount of water required for hydration. It is said that the amount of water required for the hydration reaction is 25% to 30% of the amount of cement, but in reality, a large amount of unnecessary water of 45% to 60% is used due to poor mixing etc. In contrast to the conventional method, which had no choice but to use fine grain ice, ice is a solid substance like cement or sand, so even a small amount can be mixed evenly, eliminating the need for large amounts of extra water. . This unnecessary large amount of water would lead to deterioration in quality such as a decrease in the strength of concrete and cracks after drying, so by eliminating this, the mechanical strength of concrete after setting and hardening, in other words compressive and tensile・Bending and shearing strength doubles. It would be extremely advantageous for the above-mentioned cement kneading action if fine granular ice having a uniform particle size suitable for use in the cement kneading process could be supplied.

However, conventionally, only ice crushers that coarsely crush and supply large blocks of ice have been known. Also known is an ice making machine that makes ice in advance into a fine particle size and supplies it.

<Problems to be solved by the invention> However, the above-mentioned conventional ice crusher does not meet the required 1
It is not possible to provide fine ice of m/m to 5 m/m with finely uniform particle size, and even if fine ice is made and supplied in advance, the outer surface is too smooth and the bonding with cement during kneading is difficult. There was an inconvenience that the kneading process was not good due to poor mixing.

Therefore, the inventors of the present application independently developed an ice crushing device that produces fine ice or snow particles with uniform particle size, and while solving the above-mentioned disadvantages, filed a patent application at the same time as the present application.

However, it turns out that a new problem arises here. That is, for example, fine ice or snow particles having a particle size of about 5 mm or less are crushed in an ice crushing device, then weighed in a scale hopper, and a fixed amount is sent to the supply device of the air supply means at a time. . For this reason, a fixed amount of coarse ice, etc. is temporarily stored and transferred to the supply device, but since the condition of the ice tends to change due to changes in outside air humidity and the temperature of the ice itself, fine ice, etc. When the fine ice melts, it changes into water or adheres to the melted ice or to the inner surface of the storage chamber wall, forming a large bridge-shaped ice block or obstructing the flow of the fine ice, making it extremely inconvenient and difficult to form. There was also the possibility that an unfortunate situation would arise in which it would not be possible to properly supply fine ice with a uniform particle size to the ready-mixed concrete plant.

Therefore, it is effective to constantly stir the stored fine ice etc. using a stirring device with rotating blades to prevent them from sticking to each other, but since it is fine ice etc., only the rotation trajectory of the rotary blades is stirred in an idling manner. Just do
It is difficult to stir all of the fine ice particles stored therein, and there is also the disadvantage that it is difficult to obtain a good force for forcing the group of fine ice particles in the transport direction.

The present invention solves the above-mentioned disadvantages and provides a feeding device for fine ice, etc., which can obtain sufficient pushing force in the transport direction while properly mixing and agitating the fine ice, etc. stored in a receiving hopper. purpose.

<Means for Solving the Problems> In order to achieve the above object, the present invention includes a receiving hopper having an input port and a discharge port, which rotates a rotating shaft substantially perpendicular to the main transport direction of fine ice, etc. The rotating shaft is provided with a plurality of stirring blades projecting outward from the rotating shaft. Then, a plurality of stirring blades are arranged in a spiral manner around the outer periphery of the rotating shaft with a phase of 90 degrees, and rotation of the front surface of each stirring blade adjacent to the spiral direction in the rotation direction. The cross-sectional shape parallel to the axis is formed into an inclined surface shape that is inclined in mutually opposite directions with respect to the rotation axis.

<Function> As a result, a predetermined amount of fine ice, etc. stored in the receiving hopper is subjected to the stirring action of raking up or pushing down by the rotation of the stirring blade group, and
The mutually opposite inclinations of the front surfaces of the stirring blades move fine ice particles in mutually opposite directions parallel to the rotation axis.
Therefore, even if the stirring blades are spaced apart in the direction of the rotation axis,
Since fine ice etc. move parallel to the direction of the rotation axis, 1
The two rotary blades do not agitate only the fine ice particles within their rotation locus, and the entire ice can be uniformly agitated, and the formation of cavities within the rotation locus can be prevented. In addition, the pushing down force of the stirring blades pushes out the fine ice, etc. in the transport direction, so the fine ice does not stay in the receiving hopper, and as a result, the fine ice, etc. is well agitated, and the fine ice, etc. There is no binding or adhesion of fine ice, etc. to the wall of the receiving hopper. Therefore, fine ice particles can be supplied to a ready-mixed concrete plant or the like while maintaining their shape.

The above effect will be greater if two or more rotating shafts are provided in parallel rather than a single rotating shaft, and in particular, if the corresponding stirring blades of adjacent rotating shafts are provided at substantially corresponding positions and mutually aligned with respect to the rotating shaft. If the configuration is such that the front surface in the direction of rotation is formed in the shape of an inclined surface that is inclined in the opposite direction to As a result, the stirring effect becomes even greater.

<Example> FIG. 1 shows a portable ice crushing device according to an example of the present invention. This example shows an example in which the present invention is applied to an apparatus for supplying fine grain ice of uniform particle size to a ready-mixed concrete plant, which is used instead of ice during kneading of a hydraulic cementitious composition.

In FIG. 1, a fine-grained ice supply device 1 lifts a block-shaped block of ice, that is, block ice 3, transported from an ice factory by a vehicle 2 to a hopper 5 using an ice lift 4, and slides it on a slide plate 6. and put it into the hopper 5 of the ice crusher 10. The introduced block ice is transferred to the first stage ice crushing section 1.
1, the ice is crushed into irregular coarse particles, and the second stage ice crushing section 12 below crushes the ice into smaller particles, for example, approximately
Crush the ice into 30mm ice cubes.

The coarse ice particles thus obtained are fed into the hopper 16 of the adjacent third stage ice crushing section 15 by the supply conveyor 14 while being stirred by the stirring device 13 so as not to stick to each other. In the third stage ice crushing section 15, coarse ice particles with a size of about 10 mm are obtained. At this stage, the grain size of the ice cubes is approximately uniform.

In this embodiment, the first to third stage ice crushing units 11, 12, and 15 are used as primary ice crushing devices for crushing ice blocks into coarse particles. The number of stages of the ice crushing section of the primary ice crushing device may be arbitrarily determined according to requirements.

The coarse ice crushed in the primary ice crushing device is dropped into the secondary ice crushing device located at the lower stage, where it is crushed into fine ice having a uniform particle size of, for example, 5 mm or less.

The obtained fine ice having uniform particles is stirred by a stirring device 17 to prevent mutual adhesion, and is fed to a hopper scale 21 by a supply conveyor 18, where it is weighed and set to a predetermined value. When the weight reaches , the gate 22 is opened and the object is dropped into the receiving hopper 23.

The receiving hopper 23 constitutes a fine ice supply device configured to push out the fine ice while stirring to prevent the fine ice from sticking to each other. supply.

The fine ice particles sent into the fixed quantity supply device 24 are supplied to the fresh concrete mixer 27 through the supply duct 26 along with air being blown by the blower device 25 in a fixed amount.

The fine ice with uniform particle size supplied in this way is
When mixed with cement, sand, or gravel without supplying water, fine ice is mixed evenly even in small amounts because it is solid like cement or sand.
Therefore, conventionally, for reasons such as not being able to mix with water,
In reality, unnecessary water was used in excess of the required value, which is about 45 to 60% of the amount of cement, which caused quality deterioration, such as a decrease in the strength of the poured concrete and the occurrence of cracks after drying. By using coarse-grained ice, the amount of unnecessary water can be significantly reduced and uniform kneading becomes possible. It has been proven that concrete poured with an ice content of approximately 30% of the cement ratio maintains more than twice the strength of regular concrete made with a large amount of water.

In the above embodiment, the ice crushing device 10, the hopper scale 21, the receiving hopper 23, the quantitative feeding device 24
The air blower 25 and the like are mounted and fixed on the frame 28, and the frame 28 is provided with self-propelled wheels 29, so even if the ready-mixed concrete plant is a stationary type at the construction site, it is easy to remove fine granules of ice. Supply device 1
Since it can be moved, it is possible to use commercially available block ice, crush it into fine ice of uniform particle size, weigh it, and supply it to a ready-mixed concrete plant.

In addition to commercially available block ice, it is also possible to use natural snowpack.

Next, details of the fine grained ice supply device 1 shown in FIG. 1 will be explained.

2 and 3 show the first and second stage ice crushing sections 11, 12. Both ice breaking parts 11,1
2 are housed in one casing 31 that is placed and fixed on the frame 28, and both the upper and
In the lower stage, two rotating drums 32 are parallel to each other.
a, 32b, 33a, 33b, and are rotatably supported on the wall of the casing 31, and these rotating drums 32, 32b, 33a, 33b are provided with pulleys and belts or sprockets and chains provided at their outer ends. Via a transmission device 34, a drive motor 34 forcibly drives the drive motor 34 to rotate synchronously.

Each rotating drum 32a, 32b, 33a, 33b
This is a so-called claw drum having a large number of sharp claws 35a, 35b on its outer periphery. 1st
In the staged ice crushing section 11, a claw 35a is set on the block ice thrown in from above to generate cracks.
The ice is crushed and scraped between the rotating drums 32a and 32b to cause irregular coarse ice particles to fall downward. A guide plate 36 provided below the rotating drums 32a, 32b guides coarse ice particles to fall between the rotating drums 33a, 33b of the second stage ice crushing section 12.

The second stage ice crushing section 12 includes rotating drums 33a, 33
(b) The mutual spacing can be freely adjusted, which makes it possible to freely adjust the crushed ice particle size.

The coarse ice particles obtained in this manner are dropped into the lower stirring device 13 shown in FIG. 4 while the particle size is still irregular. The stirring device 13 has a hopper case 41 with a narrowed bottom, the upper part communicates with the second stage ice crushing section 12, and the lower part communicates with the supply conveyor 1.
4, and has a plurality of parallel rotating shafts 4 inside.
3 is pivotally supported so as to be rotationally driven, and the rotating shaft 4
3, various stirring blades 42 extending in the radial direction are installed at different relative angles. In the figure, rotation axis 4
The drive device No. 3 is omitted.

When grains of ice accumulate in the hopper case 41, they are supplied to the ice crushing section 15 at the next stage via the supply conveyor 14, but depending on the atmospheric conditions such as the ice temperature or outside temperature at that time, the coarse ice may stick together. There is a risk that the ice will become so-called bridge-shaped and a cavity will be formed at the bottom of the hopper case 41, making it impossible to transport and supply the coarse ice.To prevent this, the coarse ice is forcibly stirred by the stirring blade 42. The flow of crushed ice to the supply conveyor 14 is smoothed.

The supply conveyor 14 shown in FIG. 5 is a so-called flight conveyor in which a large number of flights 47 are attached at intervals to a chain device 46 meshing with a sprocket 45.
It reaches the lower end of 3. The flight 47 is moved by driving the sprocket 45, and a conveyor case 48 is shaped to surround the movement trajectory of the flight 47.
Coarse ice is slid onto the bottom surface of the ice crusher, conveyed upward, and is dropped into the hopper 16 of the third stage ice crushing section 15 through a supply port 49 provided by opening the lower wall of the upper end.

At this time, in order to improve the discharge of coarse ice from the surface of the flight 47 and to prevent ice from adhering to the flight 47, a large number of compressed air sent from a blower device (not shown) via the pipe 50 is directed toward the surface of the flight 47. The ice is ejected from an air suction hole 51 opened at the end of the pipe 50, and the ice particles on the flight 47 are blown off toward the hopper 16 of the third stage ice crushing section 15.

Both the third stage ice crushing section 15 and the secondary ice crushing device are housed in a common casing 53.

As shown in FIGS. 6 and 8, the third stage ice crushing section 15 includes two parallel drums with claws 54a, 54b lined up with a predetermined clearance, and drums with claws 54a, 54b directly below the clearance. intermediate rolls 55 that are parallel and have a minute interval equal to
It is equipped with. Drums with claws 54a, 54b
is supported by the casing 53 so as to be rotationally driven in the direction of the arrow in FIG. 8A by a drive device (not shown), and the intermediate roll 55 is fixedly supported at both ends of the casing 53. The pawls 5b have a mountain-like (soroban-like) shape with a protruding ridge line that is slightly steep in the forward direction of rotation, and are arranged in rows at equal intervals in the circumferential direction, and are arranged in large numbers parallel to the drum axis. As the drum rotates, one pawl is placed in the middle of the plurality of pawls on the other pawl drum with a predetermined clearance.

The coarse ice supplied between the drums is scraped between the clearances of the drums by the rotation of the pair of clawed drums 54a and 54b in the direction of the arrow in FIG. Cracks enter the coarse ice between the drum surfaces, particularly at the tips of the claws 56, and the ice is crushed.

In addition, the crushed ice passing between the claw drums 54a and 54b is transferred to the intermediate roll 55 below.
When distributed to the left and right and flowing down, the claws 56 of the clawed drums 54a, 54b and the intermediate roll 5
The ice is sandwiched between 5 and 5 and further crushed to make the particle size uniform.
The coarse ice that has passed through the third stage ice crushing section 15, that is, has passed through the primary ice crushing device, is crushed into coarse ice particles with a certain degree of uniformity of approximately 10 mm.

Incidentally, the coarse ice from the second stage ice crushing section 12 that is supplied between the claw drums 54a and 54b is transferred to the claw drum 54.
The casing 53 and the sides of the claw drums 54a, 54b are close to each other to some extent so as not to spill on both sides of the drums 54a, 54b.

Furthermore, as the particle size of ice is reduced, its condition changes significantly due to changes in the outside air temperature and the temperature of the ice itself, making it easier for phenomena such as clogging and adhesion to occur during the processing process.
In order to obstruct the flow of ice, for example, as shown in FIGS. 6 and 7, an air blowing device 58 is installed that guides compressed air and blows it out from a number of air nozzles onto the wall surface. The flow of ice may be forced, or ice may be prevented from adhering to the wall surface using an air curtain, or a Teflon coating or the like may be applied to the wall surface where ice may adhere to the wall surface to smooth the flow of ice. It is preferable to apply Teflon coating or the like to other inner wall surfaces where ice may adhere.

The final stage of the primary ice crusher (3 stages as in this example)
Coarse ice cubes supplied from a stage (not limited to a stage) are crushed into fine ice cubes having a uniform particle size in a secondary ice crushing device on the downstream side. In the secondary ice crushing device, 5 mm or less, preferably 1 mm or more, 5 mm
Obtain the following crushed ice particle size uniformly according to the usage conditions. In the ice crushing means of the primary ice crushing device described above, as the crushed ice particle size becomes smaller, snow-like ice will also be mixed in, so it will adhere to the claws due to the influence of the ice temperature or the surrounding temperature environment, and the drum with claws will be damaged. It may become flat and useless like the surface of a roll. Therefore, in the embodiment of the present invention, FIG.
A secondary ice crushing device was used as shown in Fig. 0 and Fig. 11.

That is, a grooved drum 61 and a crushing drum 6 having rotating shafts parallel to each other are provided at the bottom of the casing 53.
2 is rotatably supported in the direction of the arrow in FIG. 6, and these are rotationally driven by a rotating means (not shown). The illustrated arrow direction is a direction in which the drums 61 and 62 are rotated in opposite directions so that the coarse ice particles supplied between the drums 61 and 62 are rolled up between the drums.

The grooved drum 61 has approximately circumferential grooves 63 on its outer periphery.
A plurality of circumferential grooves 63 are provided at a predetermined pitch in the direction of the drum axis, and the circumferential groove 63 may be a groove that goes around the drum's outer periphery once, or a groove that goes around once discontinuously. In this embodiment, the groove is discontinuously made one round. That is, the first
As shown in FIG. 1, at least one drum axial groove 65 is provided at a predetermined interval in the crest 64 of the circumferential groove 63 to make the circumferential groove discontinuous. Drum axial grooves 65, 65 between adjacent circumferential grooves 63, 63
are not necessarily arranged in a row in the drum axial direction, but in this embodiment, the drum axial grooves 65 are arranged in a row in the drum axial direction.
A plurality of groups are arranged in a row at predetermined intervals in the circumferential direction.
The cross section of the circumferential groove 63 perpendicular to the groove, that is, the cross section including the drum shaft may be V-shaped or V-shaped, but is not limited thereto.

On the other hand, the crushing drum 62 is provided with crushing protrusions 66 at intervals in the circumferential direction, the tips of which face the circumferential groove 63 of the grooved drum 61 through a predetermined clearance, and at least one crushing protrusion 66 is provided in the circumferential direction. It is something. In this embodiment, ten crushing protrusions 66 arranged at equal intervals in the circumferential direction are arranged as a series of protrusions parallel to the drum axis direction. However, the projections do not necessarily have to be arranged in a series.

The crushing protrusion 66 has a triangular end face as shown in FIGS. 11A and 11C when viewed from the drum rotation direction, and a tip a in the drum rotation direction has a sharply pointed shape rising steeply from the drum surface.

A rotational drive means (not shown) is configured to make the rotational speed of the crushing drum 62 sufficiently higher than that of the grooved drum 61. Also, both drums 61,
The mutual spacing of 62 can be adjusted by a position adjusting device (not shown).

The operation of the secondary ice crushing device having such a configuration will be explained using FIG. 12.
However, the ice particles received in the circumferential groove 63 cannot pass through the clearance and are held in the circumferential groove 63 between the crushing drums 62. At this time, the crushing protrusion 66 of the crushing drum 62 enters the circumferential groove 63 with a predetermined clearance, and the sharp tip of the crushing protrusion 66 crushes the coarse ice while scraping it out below the primary ice crushing device. The tip of the crushing protrusion 66 does not necessarily have to be sharp, but
In order to increase the impact force with the ice particles and improve scraping out of the ice particles, it is desirable that the tip in the rotational direction rises steeply from the drum surface.

The circumferential interval of the crushing protrusions 66 is the same as that of the crushing drum 62.
This corresponds to the rotational speed of There is a risk that the ice will slip upwardly due to the crushing protrusion 66 and slide up, significantly deteriorating the ice crushing ability, and eventually causing a large amount of coarse ice to accumulate between the drums 61 and 62. Therefore, the circumferential spacing between the crushing protrusions 66 should be determined with sufficient consideration given to the crushing ability.

Drum axial groove 65 provided in grooved drum 61
The purpose of this is to prevent coarse ice from slipping in the circumferential groove 63, and the drum axial groove 65
Coarse ice is captured within the circumferential groove 63 to prevent slippage, thereby increasing the chances of impactful contact between the crushing projections 66 and the coarse ice, thereby increasing ice crushing efficiency.

The larger the relative speed difference between the grooved drum 61 and the crushing drum 62, the greater the impact force between the crushing projections 66 and the coarse ice, but the degree of slippage of the coarse ice in the circumferential groove also increases. It is necessary to set it to a balanced and optimal value.

In this way, fine grain ice with a uniform particle size of about 5 mm to 1 mm is generally obtained, but in order to adjust the particle size, the distance between the axes of the grooved drum 61 and the crushing drum 62 (distance between the drums) Any value can be obtained by adjusting .

The fine ice particles with a uniform particle size obtained by the secondary ice crushing device are guided to the ice crushing guide 59 of the casing 53, and are passed from the fine ice outlet 67 to the stirring device 1 below.
7 and is fed into the hopper scale 21 via the supply conveyor 18. The stirring device 17 and the supply conveyor 18 are the stirring device 13 mentioned earlier.
and has substantially the same configuration as the supply conveyor 14. However, the dimensions are designed to take into account the fact that the ice cubes handled are in the form of fine particles, and areas where snow-like components tend to adhere are coated with Teflon or the like to prevent this.

The hopper scale 21 measures the weight of fine ice particles to be supplied using a weight sensor, and when a predetermined weight has been measured, the operation of the supply conveyor 14 is stopped and the gate 22 is opened at the same time, and a fixed amount of fine ice particles is measured by the hopper scale 21. The ice is received and dropped into the hopper 23. On this occasion,
In order to improve measurement accuracy, the hopper scale 21 needs to be isolated from the vibrations received from the ice crushing device 10 and the frame 28. For this reason, a hydraulic cylinder or hydraulic jack (not shown) is interposed between the frame 28 and the frame 28. It is preferable to support the hopper scale 21 from 28 in a floating manner.

The amount of fine ice or snow measured by the hopper scale 21 is dropped and supplied to the receiving hopper 23 at a time via the input port 23a, so that the ice particles etc. do not form in lumps in the receiving hopper 23. It is easy to deposit and is not smoothly supplied from at least the discharge port 23b. This tendency becomes more pronounced especially when the receiving hopper 23 is narrowed toward the discharge port 23b.

Therefore, as a feeding device for fine ice or snow, a stirring means having stirring and other conveying functions is provided in the receiving hopper 23. The agitation means supports the hopper 23 by rotatably driving a rotary shaft 71 which is substantially perpendicular to the main transport direction of fine ice or snow, which in this embodiment is the vertical direction. Then, a plurality of stirring blades 72 are swung outward from the rotating shaft 71, preferably in the radial direction (direction perpendicular to the axis). In this embodiment, the base ends of the plurality of stirring blades 72 are connected to the rotating shaft 7.
The structure is such that they are located in a spiral shape with a phase of 90 degrees around one outer circumference.

The plurality of stirring blades 72 have a rotation axis 71 on a front surface in the rotational direction of each of the stirring blades 72 adjacent to each other in the spiral direction.
At least two types of stirring blades are formed, in which the cross-sectional shape parallel to the stirring blade 71, that is, the cross-sectional shape perpendicular to the longitudinal direction of the stirring blade 72 in this embodiment, is formed into an inclined surface shape that is inclined in opposite directions with respect to the rotating shaft 71. 72a,
72b.

At least two rotating shafts 71 equipped with stirring blades 72 having such a configuration are arranged in parallel in the receiving hopper 23. In this embodiment, a plurality of pairs of sprockets or pulleys 74 are arranged in parallel vertically, and the driving force of a rotary drive device 75 is transmitted via a winding transmission device 76 to a sprocket or pulley 74 provided at the outer end of each rotating shaft 71. This constitutes a rotation drive means in which each rotating shaft 71 rotates in the same direction in synchronization.

Here, a pair of parallel rotating shafts 71 on the same stage
In a and 71b, the corresponding stirring blades 72 are in the same phase as shown in FIG. There is.

According to such a configuration, when one rotating shaft, for example, _71a , is rotated in the direction of the _arrow shown in FIG. While scraping upward,
W ₁ and W ₂ are moved parallel to the rotating shaft 71a to the front left in the figure due to the inclination of the front surface of the stirring blade, and W ₃ and
W ₄ is also tilted in the opposite direction to the rotation axis 7.
Move it parallel to 1a to the right in the figure. Further, the stirring blades W ₅ to _{W 7} move downward to push out the fine ice particles downward and, as shown in the figure, move them parallel to the rotating shaft 71a. The action of pushing fine ice downwards is
This is nothing but the operation of receiving fine ice and conveying it from the hopper 23 to the discharge port, and the operation of raking it up and rotating shaft 71a.
The operation of moving parallel to is both a stirring operation. In particular, if the fine ice is not moved parallel to the rotating shaft 71a, only the fine ice within the rotation locus of one stirring blade will be stirred and pushed downward, resulting in the formation of a cavity within the locus and the extrusion effect. In addition, the fine ice particles are not stirred and conveyed between adjacent stirring blades, resulting in inconvenience.
In order to prevent this, it is effective to move the fine ice in opposite directions parallel to the rotating shaft 71a, and for this purpose, two or more types of inclinations of the stirring blades are provided.

For the above-mentioned stirring and conveying actions, it is effective to arrange a pair of rotating shafts 71 in parallel. In this case, the corresponding stirring blades of a pair of rotating shafts (for example, W ₅ and W ₈ ,
The stirring effect will be better if the rotational direction front surfaces are provided at substantially corresponding positions and tilted in _{opposite directions} . This is because the fine ice is stirred back and forth in one direction by one rotor and in the other direction by another rotor. These pairs of rotating shafts are provided in a plurality of stages, and the fine ice particles falling in a fixed quantity from the hopper scale 21 are well stirred and conveyed, and are supplied from the discharge port 23b to the fixed quantity supply device 24 for the next step.

The quantitative supply device 24, as shown in FIG.
A rotor 82 is rotatably supported on the central axis of a casing 81 whose lower portion has a semicircular cross section. A storage groove 83 with a semicircular cross section perpendicular to the axis is provided on the outer periphery of the rotor 82.
extend in the axial direction of the rotor, and are arranged in rows at equal intervals in the circumferential direction. On the other hand, the bottom wall of the casing 81 is provided with a supply passage 84 that cooperates with one of the storage grooves 83 to form one space having a circular cross section. A circular air inlet 8 is provided at the bottom of the casing 81 in correspondence with the supply passage 84.
5 and a conveyance port 86 are opened, and an air inlet 8
5 is connected to the outlet of the blower 25, and the conveyance port 8
6 is connected to a supply duct 26.

Therefore, the fine grained ice introduced into the casing 81 of the metering supply device 24 is transferred to the rotor 8 which is driven to rotate intermittently or continuously by external power.
2 are carried into the storage groove 83 one after another, and guided by the inner wall of the casing 81 and brought downward. When one storage groove 83 coincides with the supply passage 84 at the bottom of the casing, the air forced from the blower 25 is guided to the air inlet 85, and fine ice particles are supplied together with the air through the supply duct 26 to the ready-mixed concrete. It is supplied under pressure to the mixer 27.
Note that when the air blowing from the air blower 25 is unnecessary,
A damper device (not shown) is provided at the suction port of the blower device 25, and by closing the damper device, wasteful discharge of air is prevented. In addition, in ready-mixed concrete plants, the height of the mixer above ground is high, so it is difficult to determine when ice will be supplied from the ground. Therefore, the ice supply timing is preferably determined by instructions from the mixer.

Furthermore, the reason why we adopted the pneumatic transportation method for fine ice is as follows. In other words, the amount of fine ice to be supplied per 1 m ³ of fresh concrete is 140Kg to 170Kg (depending on the moisture content of sand and aggregate), and is supplied after weighing, but if this is done using a pouring chute device, etc.
The measuring ice falls all at once, clogging the sink chute device. This is also a phenomenon that occurs because when the ice grain size becomes finer, the state of the ice changes due to temperature changes. This is because fine ice must be forcibly supplied in a short period of time.

The fine ice having a uniform particle size thus supplied to the fresh concrete mixer 27 works well as described above, making it possible to produce high-strength concrete and the like.

Of course, the present invention is not limited to supplying fine ice used only for cement kneading, but can also be applied as a supply device for uniformly stirring and smoothly supplying fine grained ice or snow flakes. it is obvious.

The embodiment shown in FIG. 15 is a stationary fine ice supply device 111 configured to be applied to a stationary ready-mixed concrete plant.

That is, a frame 112 is erected on the base, and an ice lift 113 for transporting the block ice 3 to the top is provided on the frame 112. The supplied block ice 3 is the first
The ice is crushed into fine particles in order from the top through the stage ice crushing section 114 and the second stage ice crushing section 115, and the ice is crushed into fine particles by the stirring device 116.
After being stirred and flowed down, the ice is again transferred to the third stage ice crushing section 117 to obtain fine grained ice, thereby completing the process of the primary ice crushing device. After that, the coarse ice reaches the secondary ice crushing device, where it becomes coarse ice with a uniform particle size, is stirred by a stirring device 118 and flowed down, and is moved laterally by a screw type supply conveyor 119. The ice is dropped onto a hopper scale 121, subjected to the stirring and extrusion action of the stirring device 120 which also functions as a feeding device according to the present invention, and a fixed amount of fine ice is sent to the quantitative feeding device 120, where it is forced into the air blowing device 122. Air is utilized and supplied to the raw asbestos construction via the supply duct 123. The structure of each of these device parts does not deviate greatly from the previous embodiment, but only the frame 112.
They are simply arranged in order from top to bottom.

<Effects of the Invention> As described above, according to the present invention, a plurality of stirring blades are arranged in a spiral manner around the outer periphery of the rotating shaft with a phase of 90 degrees, and adjacent stirring blades in the spiral direction The cross-sectional shape of the front surface of each stirring blade in the rotation direction parallel to the rotation axis is formed into an inclined surface shape that is inclined in opposite directions with respect to the rotation axis, so that the fine particles stored in the receiving hopper are When the rotating stirring blades stir ice or snow, the fine ice or snow moves back and forth in the longitudinal direction of the rotating shaft, allowing for uniform stirring. It can also stir snow. In addition, stirring and extrusion can be performed by rotating the stirring blade, and good stirring and driving force in the transport direction can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of a portable fine ice supply device including a supply device according to the present invention;
The figure is a longitudinal cross-sectional view of the first and second stage ice crushing sections same as above, FIG. 3 is a rear view same as above, and FIG. 4 is a perspective view showing the stirring device of the next step of the second stage ice crushing section. FIG. 5 is a perspective view of the upper part of the supply conveyor in the next step of the stirring device, FIG. 6 is a vertical side view showing the third stage ice crushing section and the secondary ice crushing device, and FIG. 7 is the air blowing device of the same as above. FIG. 8 shows a pair of drums with claws, which are the main parts of the third-stage ice crushing section, with A being a plan view and B being a side view seen from the axial direction. Figure 9 is a side view showing the ice crushing action by the drum with claws in Figure 8;
The figures show a grooved drum and a crushing drum, which are the main parts of the secondary ice crushing device, A is a side view, B is a plan view, FIG. 11 is a partially enlarged view of FIG. X1 in Figure 10 _{A A plan view showing the crushing protrusion facing the circumferential groove at part A} ; B is X1 in Figure 10
A plan view of part _B , C is a view of the crushing protrusion seen from the drum axis direction, D is a side view showing part X1 _D of Fig. 10B,
Fig. 12 is a cross-sectional side view at right angles to the drum axis, showing the ice crushing action by the grooved drum and the crushing drum, and Fig. 13 is a
A stirring device as a feeding device for fine ice etc. according to the present invention in the next step of the secondary ice crushing device is shown, A is a perspective view and B is a perspective view.
C is a perspective view showing a pair of rotating shafts equipped with stirring blades;
14 is a cross-sectional view perpendicular to the axis of a pair of rotating shafts at B, FIG. 14 is a quantitative feeding device, A is a vertical cross-sectional view in the direction perpendicular to the axis, and B is a vertical cross-sectional view in a direction including the shafts. FIG. shows another embodiment of the stationary fine-grained ice supply device according to the present invention, A is a front view;
B is a side view. 10...Ice crushing device, 23...Receiving hopper, 7
1, 71a, 71b...rotating shaft, 72, 72a,
72b, W ₁ to _{W 14} ... Stirring blade, 74 ... Sprocket or pulley, 75 ... Rotation drive device, 7
6...Wrap conduction device.

Claims (1)

[Scope of Claims] 1. A receiving popper having an inlet and an outlet for fine ice or snow, a rotating shaft substantially perpendicular to the main conveyance direction of the fine ice or snow in the receiving popper, and a rotating shaft for rotating the fine ice or snow. The apparatus includes a plurality of stirring blades projecting outward from a shaft and a means for driving the rotation of the rotating shaft, and the plurality of stirring blades are arranged in a spiral manner around the outer periphery of the rotating shaft with a phase of 90 degrees. The cross-sectional shape of the front surface in the direction of rotation of each of the stirring blades adjacent to each other in the spiral direction is formed into an inclined surface shape that is parallel to the rotation axis and tilted in opposite directions with respect to the rotation axis. A device for supplying fine-grained ice or snow. 2. The fine-grained ice or snow supply device according to claim 1, wherein the stirring blade projects outward in a direction substantially perpendicular to the rotation axis. 3. Claim 1 or 2, characterized in that at least two rotating shafts are provided in parallel.
Fine-grained ice or snow supply device as described in Section 1. 4. The stirring blades are formed in the shape of inclined surfaces that are provided at substantially corresponding positions, and are tilted in opposite directions with respect to the rotation shaft, so that the corresponding stirring blades of adjacent rotation shafts are provided in substantially the same position, and are tilted in the forward direction of the rotation direction. 4. The apparatus for supplying fine ice or snow according to claim 3, characterized in that it has a surface of . 5. The fine ice or snow supply device according to any one of claims 1 to 4, wherein the rotational drive means includes means for synchronously rotating a plurality of rotating shafts. .