JPH0455741B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an ice crushing device for crushing ice blocks or snow blocks into fine particles having a uniform particle size and supplying the fine particles.

<Conventional technology> When mixing concrete, the method of mixing it with water and using ice has been used for a long time. 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 excessively, such as during periods when the outside temperature is high or in tropical regions, the mixed ready-mixed concrete also becomes quite hot, so the surface area is reduced simply to cool it down. It merely supplies large pieces of sliced ice, and is unsuitable 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 and other reasons. In contrast to conventional methods, which were unavoidable, when fine ice is mixed, ice is solid like cement and sand, so even a small amount can be mixed evenly, and the extra large amount of water mentioned above is not needed. This unnecessary large amount of water would lead to deterioration in quality, such as a decrease in concrete strength and cracks after drying.
By eliminating this, the mechanical strength of concrete after it sets and hardens, that is, its compressive, tensile, bending, and shear strengths, 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. In particular, the disadvantage of the former is that the grain size of fine ice is not uniform.If the ice is too large, the kneading distribution with cement and sand is poor, and it is necessary to supply other extra ice, while if the ice is too small, The condition of the ice changes significantly due to changes in the outside air temperature or the temperature of the ice itself, and it may turn into water in the ice crusher and its supply process, or it may adhere to the fine ice particles in the melting ice or to the walls of the conveying equipment, resulting in large ice blocks. This was extremely inconvenient as it formed ice particles and obstructed the flow of fine ice on the walls of the conveying device.

The present invention solves the above-mentioned disadvantages of conventional devices, and provides an ice crushing device that can crush ice blocks into fine ice or snow blocks with a predetermined particle size and supply them to, for example, a cement plant. purpose.

<Means for Solving the Problems> In order to achieve the above object, the present invention crushes ice blocks into coarse particles using a primary ice crushing device, and then crushes the coarse ice particles using a secondary ice crushing device. The present invention provides an ice crushing device that crushes ice into fine ice particles with a uniform particle size, and the secondary ice crushing device includes a grooved drum having a plurality of approximately circumferential grooves on the outer circumference at a predetermined pitch, and a grooved drum having a plurality of approximately circumferential grooves at a predetermined pitch on the outer circumference; a crushing drum having crushing protrusions spaced apart in the circumferential direction, the tip of which faces through a predetermined clearance;
These drums are rotated by means of a rotation driving means, and the coarse ice supplied between the two drums is rolled up between the two drums, and the circumferential speed of the crushing drum is set to be lower than the circumferential speed of the grooved drum. The configuration is such that it is rotated so that it becomes larger.

<Function> As a result, the coarse ice particles fed from the primary ice crushing device are fed onto the secondary ice crushing device, and the particle size is uniformized into fine particles between the grooved drum and the crushing drum. The ice is then crushed.

To describe this in detail, the coarse ice particles are contained within the substantially circumferential groove of the grooved drum and aligned in the clearance with the crushing drum. The aligned coarse ice particles are crushed by the crushing protrusions of the crushing drum that rotates roughly into the circumferential groove, and only when the grain size is large enough to pass through a predetermined clearance does it come out of the clearance between the two drums. It passes through to the side, becomes ice granules with uniform particle size, and is supplied to, for example, a cement kneading process. At this time, by setting the circumferential speed of the crushing device to be higher than the circumferential speed of the grooved drum, the crushing protrusions of the crushing drum can be set to a greater extent than the ice particles stored in the approximately circumferential groove of the grooved drum. By colliding with impact force, ice particles can be finely divided.

Here, the reason why the crushing protrusions on the surface of the crushing drum are provided at intervals in the circumferential direction is because of the crushing protrusions.
This is because fine grained ice can pass between the drum clearances, and the impact force between the crushing protrusions and the ice grains stored in the circumferential groove of the grooved drum is effectively used to crush the ice. It is also to increase efficiency. The clearance between the circumferential groove and the crushing protrusion, as well as the groove shape and width of the circumferential groove, serve to uniformly determine the particle size of the crushed ice particles.

The approximate circumferential groove of a grooved drum includes circumferential grooves that are discontinuous due to drum axial grooves arranged at predetermined intervals in the peaks of the circumferential groove, and The ice particles sliding in the grooves are aligned and the crushing protrusions collide with them, thereby increasing the ice crushing effect.

When the above-mentioned drum axis direction groove group and crushing protrusion group of the approximately circumferential groove are arranged in a row in the drum axis direction, the effect of capturing ice grains becomes high and the ice grains do not slide away from the roughly circumferential groove, and one row is arranged here. If a group of crushing protrusions collide with each other, the above-mentioned ice-breaking effect will be further improved.

The shape of the crushing protrusion has a triangular end face when viewed from the direction of rotation of the drum, and if the tip in the drum rotation direction is raised at a steep slope from the drum surface, the impact force of the tip of the crushing protrusion on the ice particles increases and the ice crushing effect is improved. improves.

<Embodiment> FIG. 1 shows a portable ice crushing device according to an embodiment 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 water 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 a solid substance 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, and 33b, and are rotatably supported on the wall of the casing 31, and these rotating drums 32a, 32b, 33a, and 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 air 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 particle 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. The drums 54a and 54b with claws are supported by the casing 53 so as to be rotationally driven in the direction of the arrow in FIG. The pawls 56 have a mountain-like (soroban-like) shape with a slightly steep protruding ridge line at the front in the rotation direction, and are arranged in rows at equal intervals in the circumferential direction, and are arranged in large numbers parallel to the drum axis. As a result of rotation, one pawl is placed in the middle of the plurality of pawls of the other pawl-equipped 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. The ice is crushed by cracking the coarse ice caught on the surface of the drum, especially at the tips of the claws 56.

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 ice cubes 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 6 is provided at a predetermined interval in the crest 64 of the circumferential groove 63.
5 is provided to make the circumferential groove discontinuous. Although the drum axial grooves 65, 65 of the adjacent circumferential grooves 63, 63 do not necessarily have to be arranged in a row in the drum axial direction, in this embodiment, the drum axial grooves 65 are arranged in a row.
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. In addition, drum 61, 6
Since the diameters of the crushing drums 2 and 2 are approximately the same, the rotational speed of the crushing drum 62 was set to be sufficiently larger than that of the grooved drum 61. However, when the diameters of the drums 61 and 62 are different, the circumferential speed of the outer periphery of the crushing drum 62 is set to be larger than that of the grooved drum 61. The rotational speed may be set to be sufficiently higher than the circumferential speed of the outer peripheral portion of the attached drum 61. Further, the mutual distance between the drums 61 and 62 can be adjusted by a position adjustment 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. At this time, since the rotational speed of the crushing drum 62 was set sufficiently higher than the rotational speed of the grooved drum 61, the crushing protrusion 66 of the crushing drum 62 entered the circumferential groove 63 at high speed, causing the roughness in the circumferential groove 63 to be Since it collides with the ice particles with a large impact force, the coarse ice particles can be effectively crushed into fine and uniform fine ice particles. The tip of the crushing protrusion 66 does not necessarily have to be sharp, but it is preferable that the tip rises steeply from the drum surface in the direction of rotation in order to increase the impact force with the ice particles and improve the scraping of fine ice particles. .

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 has a rotating shaft 71 substantially perpendicular to the main transport direction of fine ice or snow, which is the vertical direction in this embodiment, supported by the receiving hopper 23 so as to be freely rotatable by a rotary driving means. A plurality of stirring blades 72 are made to project outward from this rotating shaft 71, preferably in the radial direction (in the 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 cross section parallel to the rotating shaft 71 on the front surface in the rotation direction, that is, in this embodiment, a cross section perpendicular to the longitudinal direction of the stirring blades 72 is parallel to the rotating shaft 71.
at least 2 inclined in mutually opposite directions with respect to 1;
It has seed stirring blades 72a and 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 move them parallel to the rotating shaft 71a as shown in the figure. The operation of pushing the fine ice downwards is nothing but the operation of receiving the fine ice and conveying it from the hopper 23 to the discharge port, and the scraping operation and the operation of moving parallel to the rotating shaft 71a are both stirring operations.
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 part 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. At the bottom of the casing 81, there is a circular air inlet 8 corresponding to 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 a phenomenon that occurs when the ice grain size becomes finer and 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, it is clear that the present invention can be applied not only to supplying fine ice particles used only for cement kneading, but also as an ice crushing device for supplying fine ice particles or snow particles having a uniform particle size.

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 coarse particles sequentially from the top through the stage ice crushing section 114 and the second stage ice crushing section 115, and is then crushed into coarse 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 coarse grained ice, thus 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 the hopper scale 121, subjected to the stirring and extrusion action of the stirring device 120, and a fixed amount of fine ice is sent to the quantitative feeding device 120, where it is fed through the supply duct 123 using compressed air from the blowing device 122. is fed to the raw asbestos plant via The configuration of each of these device parts does not differ greatly from the previous embodiment, but is simply arranged on the frame 112 in order from the top.

<Effects of the Invention> As described above, according to the present invention, the ice blocks or snow blocks are crushed into coarse particles by the primary ice crushing device, and the ice particles are placed in the circumferential groove of the grooved drum in the secondary ice crushing device and crushed. The tip of the crushing protrusion of the drum faces the circumferential groove, and the crushing drum is rotated at a higher speed than the grooved drum to crush ice, making it possible to create fine particles with uniform particle size, which was impossible with conventional ice crushing equipment. Can supply ice cubes.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of a portable fine ice supply device including an ice crushing device according to the present invention;
The figure shows a vertical sectional view of the first and second stage ice crushing sections, and
The figure is a rear view of the same as above, FIG. 4 is a perspective view showing the agitation device for the next process of the second stage ice crushing section, and FIG. 5 is a perspective view of the upper part of the supply conveyor for the next process of the agitation device.
Fig. 6 is a longitudinal side view showing the third stage ice crushing section and the secondary ice crushing device, Fig. 7 is a perspective view of the same air blowing device as above, and Fig. 8 is a main part of the third stage ice crushing section. A pair of drums with claws are shown, A is a plan view, B is a side view seen from the axial direction, FIG. 9 is a side view showing the ice crushing action by the drum with claws in FIG. 8, and FIG.
Next, the grooved drum and crushing drum, which are the main parts of the ice crushing device, are shown, A is a plan view and B is a side view.
The figure is a partially enlarged view of Figure 10, and A is Figure 10 A.
A plan view showing a state in which the crushing protrusion faces the circumferential groove in the X1 _A section of , B is a plan view of the X1 _B section of FIG. 10 A,
C is a view of the crushing protrusion viewed from the direction of the drum axis, D is a side view showing the X1 _D section of Figure 10B, Figure 12 is a side view in section perpendicular to the drum axis showing the ice crushing action by the grooved drum and the crushing drum, Figure 13 shows a stirring device constructed in the secondary ice crushing device, A is a perspective view, B is a perspective view showing a pair of rotating shafts equipped with stirring blades, and C is a cross-section perpendicular to the axis of the pair of rotating shafts in B. Figure, 14th
The figure shows a quantitative feeding device, where A is a vertical cross-sectional view in the direction perpendicular to the axis, and B is a vertical cross-sectional view in the direction including the axis. Another embodiment is shown, in which A is a front view and B is a side view. 10... Ice crushing device, 11... First stage ice crushing section, 12...
2nd ice crushing unit, 15...3rd ice crushing unit,...primary ice crushing device,...secondary ice crushing device, 61...grooved drum,
62... Crushing drum, 63... Circumferential groove, 64... Mountain part, 6
5... Drum axial groove, 66... Crushing protrusion.

Claims (1)

[Scope of Claims] 1. A primary ice crushing device that crushes ice cubes into ice particles;
a secondary ice crushing device that crushes the grouped ice cubes supplied from the primary ice crushing device into fine particles; a crushing drum having a grooved drum on its outer periphery, and a crushing drum having crushing protrusions spaced apart in the circumferential direction, the tips of which face the approximately circumferential groove through a predetermined clearance;
The two drums are moved in opposite directions so that the coarse ice supplied between the two drums is rolled up between the two drums, and the circumferential speed of the crushing drum is greater than the circumferential speed of the grooved drum. An ice crushing device characterized by comprising: a rotation drive means for rotating. 2. The approximate circumferential groove of the grooved drum is a discontinuous circumferential groove that discontinuously goes around the drum surface once through at least one drum axial groove arranged at a predetermined interval in the crest of the circumferential groove. An ice crushing device according to claim 1, characterized in that: 3. The ice crushing device according to claim 2, wherein the drum axis direction groove is one of a group of grooves arranged in at least one series parallel to the drum axis. 4. The ice crushing device according to claim 1, wherein the substantially circumferential groove of the grooved drum has a V-shaped cross section including the drum shaft. 5. The ice crusher according to any one of claims 1 to 4, wherein the crushing protrusion is one of a group of protrusions arranged in at least one series in parallel to the drum axis direction. Device. 6. The ice crushing device according to claim 1, wherein the crushing protrusion has a triangular end face when viewed from the drum rotation direction. 7. The ice crushing device according to claim 1, wherein the crushing protrusion has a sharply-pointed tip that rises steeply from the drum surface in the direction of rotation of the drum. 8. The ice crushing device according to claim 1, wherein the grooved drum and the crushing drum have a configuration in which mutual spacing can be adjusted.