JPH0639798Y2 - Equipment for producing medium stones for producing crushed sand for concrete - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing medium stones used for producing crushed sand for concrete, and more specifically, for processing a plurality of crushed stones into high-quality medium stones that can be used for production of crushed sand for concrete. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, a device called a rod mill has been known as a device for producing crushed sand for concrete, but this rod mill has a plurality of metallic members in an internal stirring chamber of a cylindrical drum. The rod is housed in a rollable manner, the raw sand and water are supplied into the rod, and the cylindrical drum is rotated to forcibly crush the raw sand by the impact force of the metal rod to obtain crushed sand. It is configured as follows. However, the hardness of the metal rod is much higher than the hardness of the raw sand, and therefore the impact force applied to the raw sand from the metal rod becomes extremely large. Since it is merely crushing the raw sand, it can only perform some frictional action, and it cannot naturally perform the action of gradually grinding the surface of the raw sand.Therefore, use a rod mill. The crushed sand produced in this way is of extremely low quality as fine aggregate, which is the main raw material for concrete. In particular,
Of naturally existing river sand, mountain sand, sea sand or land sand, etc.
It is known that river sand, which is hard and whose grain shape is almost spherical, has the highest quality as fine aggregate, and the rate of grain shape judgment by this washed sample of river sand (JIS A 5004 The value obtained by dividing by dry specific gravity) is 57 to 59%, while the crushed sand obtained by the rod mill has a grain shape determination performance rate of around 53%. And, the crushed sand obtained by the rod mill has various defects such that the grain shape is not spherical but flat and angular, the surface (skin) is not smooth, and cracks are generated. , The workability and the fluidity of the concrete are adversely affected.

In order to deal with such a problem, the applicant of the present invention proposes to produce crushed sand as follows in the previous patent application (JP-A-2-222736 [US Pat. No. 4,995,561]). did. That is, as shown in FIG. 9, a plurality of medium stones 3 ... 3 are provided in the inner stirring chamber 2 of the cylindrical drum 1.
In the state of being stacked, the raw sand 4 and the water 5 are continuously fed thereinto, and the cylindrical drum 1 is rotated by the operation of the drive device so that the medium stones 3 ... The raw sand 4 and the water 5 are stirred, and the crushed sand 6 generated by this stirring action is continuously taken out together with the water from the discharge port 7. According to this, since the medium stone, the raw sand and the water are agitated, the entire surface of the raw sand is ground under substantially the same conditions as the generation process of the river sand. It has all the advantages that the impurities adhering to the surface are removed, and that it has various advantages that river sand has, that is, the grain shape is close to a sphere, it is not flat, the surface is smooth, and cracks do not occur. Crushed sand will be obtained in a short time.

[0004]

However, even if the crushed sand manufacturing means for concrete proposed by the present applicant is used, there are still problems to be solved in order to manufacture crushed sand of higher quality. That is, the medium stone that mainly contributes to the grinding action on the raw sand is spherical like the cobblestone or the ballast generated by the flow of the natural river. However, it is extremely difficult to select and collect such spherical natural stones, which requires a great deal of labor and labor, and the amount of natural stones is limited. Therefore, there is a problem that collection is practically impossible. Therefore, it is preferable to use the crushed stone generated in the crushed stone manufacturing plant or the like, rather than selecting and collecting an appropriate one from naturally existing cobblestones, considering the labor, labor and quantitative limit. However, this crushed stone is generally spherical rather than spherical, and cannot be said to have an appropriate shape for performing the grinding action on the raw sand. Therefore, if the crushed stone produced in the crushed stone manufacturing plant or the like was used as a medium stone without any processing, it is difficult to produce high-quality crushed sand, of course, The problem is what kind of processing is best applied to crushed stones.

The present invention has been made in view of the above circumstances, and uses a crushed stone as a raw material to efficiently and automatically use a crushed stone as a raw material for a medium stone that performs a grinding action on the raw sand. It is a technical subject to work into a product having desired characteristics and to improve a smooth work flow in this step and work efficiency of the apparatus.

[0006]

The manufacturing apparatus according to the present invention, which has been made to achieve the above technical problems, has the following features. That is, the medium stone manufacturing apparatus in the case of adopting a means for producing crushed sand for concrete by stirring the raw sand and the medium stone, the cylindrical drum having an inside as a stirring chamber, and the cylindrical shape A drive device for rotating the drum is provided, and an opening portion that doubles as an input port and a discharge port is provided on one end wall of the cylindrical drum, and from the inner surface of the one end wall of the cylindrical drum to the opening portion. Attaching spiral blades, the crushed stones are pushed into the central part of the internal stirring chamber when the cylindrical drum is rotating normally, and the crushed stones of the internal stirring chamber are compressed when the cylindrical drum is rotating backward. The shape of the blade is set so that the blade performs an operation of discharging from the opening. And
A dust collector is attached to the other end wall of the cylindrical drum.

[0007]

According to the above means, when manufacturing the medium stone, a plurality of crushed stones, which are raw stones, are put into the internal stirring chamber through the opening formed in the one end wall of the cylindrical drum, and the cylindrical drum is operated by the operation of the driving device. The plurality of crushed stones are positively stirred in the internal stirring chamber by rotating and driving. At the time of this stirring, since the cylindrical drum is rotating in the normal direction, the plurality of crushed stones are stirred by the action of the spiral blades attached from the inner surface of the one end wall of the cylindrical drum to the opening portion while stirring internally. Since it is pushed into the center of the chamber, the stirring action is performed not only by the inner surface of the peripheral wall of the cylindrical drum but also by the inner surface of the one end wall, and the problem that aggregated crushed stones remain around the opening does not occur. Incidentally, if a dust collector is attached to the other end wall of the cylindrical drum, it is possible to avoid a situation in which dust scattered due to stirring of crushed stone is collected by the dust collector and the dust has an adverse effect on the stirring action. On the other hand, after the above-mentioned stirring action is performed for a predetermined period of time and the angular crushed stone is rounded and the manufacturing process is completed, the cylindrical drum is reversed by the operation of the driving device. As a result, the crushed stone that has been stirred moves from the inner surface of the one end wall of the cylindrical drum to the opening along the spiral blade, and is taken out through the opening.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a medium stone manufacturing apparatus 10 according to the present invention includes a cylindrical drum 11 having an agitation chamber inside, and a drive device 12 for rotating the cylindrical drum 11. . The driving device 12 includes four rollers 15 ... 15 rotatably held on the upper surface of a base 13 via brackets 14 ... 14, and a motor 16 mounted on the upper surface of one side of the base 13. A drive sprocket 18 fixed to the rotary shaft 17 of the one motor 16, a driven sprocket 19 fixed to the outer periphery of the axial center portion of the peripheral wall of the cylindrical drum 11, and both sprockets 1
It is composed of a chain 20 wound around 8 and 19. The rotational force of the motor 16 causes the chain 20
Is transmitted to the cylindrical drum 11 via the roller, the cylindrical drum 11 rolls above the four rotating rollers 15 ... In addition, the both sprockets 1
8 and 19 may be constituted by toothed pulleys or V-shaped pulleys, and the chain 20 may be constituted by timing belts or V belts.

On the other hand, as shown in FIGS. 1 to 3, an opening 21 is formed at the center of the one end wall 11a of the cylindrical drum 11 to serve as an inlet and an outlet for the crushed stone which is a raw stone. A small-diameter tube 22 is provided around the opening 21, and a spiral blade 23 is attached from the inner surface of the one end wall 11a to the opening 21. As shown in FIG. 3, when the cylindrical drum 11 is normally rotated in a state where a plurality of crushed stones 24 ... 24 are accommodated in the internal stirring chamber of the cylindrical drum 11, the blades 23 cause the crushed stones 24 ... 24 is pushed into the central part side (left side) while the cylindrical drum 11 is reversed, the blades 23 collect the crushed stones 24 ... 24 in the opening 21 and discharge them outward. I do. As shown in FIG. 1, a chute 25 in which discharged crushed stones are dropped and stored is arranged immediately below the opening 21 (small-diameter pipe 22).

On the other hand, as shown in FIGS. 1, 4 and 5, on the inner surface of the other end wall 11b of the cylindrical drum 11, a plurality of radially stirring ridges 26 ... 2 extending radially.
6 is attached, a mesh is stretched over the dust discharge port 27 formed in the other end wall 11b, and a dust collector 28 is attached to the outside of the dust discharge port 27. Then, as shown in FIG. 5, the dusts 29 ... 29 generated by the stirring of the crushed stones are collected by the dust collector 28 through the dust discharge port 27 of the other end wall 11b. still,
As shown in FIG. 1, the other end wall 11b of the cylindrical drum 11 is formed.
A collar portion 30 is formed on the outer periphery, and a pair of rotatable auxiliary rollers 3 that clamp the collar portion 30 from both sides.
1, 31 are mounted on the base 13 via the auxiliary brackets 32, 32.
Is attached to.

Further, as shown in FIGS. 2 to 4, a rubber sheet 33 as a shock absorbing sheet is adhered to the inner surface of the peripheral wall of the cylindrical drum 11 over the entire circumference thereof, and is substantially the same. A plurality of parallel stirring ridges 34 ... 34 extending in parallel at each angular interval are attached.

According to the above construction, the crushed stones 24 ... 24 generated in the crushed stone manufacturing plant or the like are charged into the internal stirring chamber through the opening 21 (small diameter tube 22) formed in the one end wall 11a of the cylindrical drum 11. Then, by driving the drive device 12 to rotate the cylindrical drum 11 in the normal direction, a plurality of crushed stones 24 ... 24 are agitated as shown in FIG. 6, and dusts 29 ... 29 generated by the agitation are collected by the dust collector 28. To be collected. In this case, the spiral blades 23 attached to the inner surface of the one end wall 11a of the cylindrical drum 11, the radial stirring ridges 26 attached to the inner surface of the other end wall 11b, and the parallel stirring ridges 34 attached to the inner surface of the peripheral wall. By the action, the stirring is efficiently and positively performed, and the action of the rubber sheet 33 attached to the inner surface of the peripheral wall moderates the excessive impact applied to the crushed stones 24. It can be said that such an action causes the process of producing boulders and balas according to the flow of the natural river in an extremely short time. After the stirring operation is performed for a predetermined time, the operation of the drive device 12 is switched to reverse the cylindrical drum 11, so that the crushed stones 24 along the blades 23 on the inner surface of the one end wall 11a of the cylindrical drum 24. 24 moves to the opening 21 (small diameter tube 22),
It is discharged from the opening 21 to the outside and is dropped and stored in the chute 25. If the effect of the stirring action is devised, the crushed stone 24, which was in a state of being square as shown in FIG. 7 before the stirring action was performed, was changed to a square as shown in FIG. 8 after the stirring action was performed. Crushed stones 24
It becomes (medium stone).

[0013]

As described above, according to the medium stone manufacturing apparatus of the present invention, the cylindrical drum is provided with a single opening on one end wall thereof which also serves as an inlet and an outlet, and the cylindrical drum. Since a blade having a specific shape is attached from the inner surface of the one end wall to the opening, the blade acts to push the crushed stone into the central portion of the internal stirring chamber when the cylindrical drum is normally rotating. As a result, the stirring efficiency is improved, and when the cylindrical drum is rotating in the reverse direction, the blades act to collect the crushed stones in the internal stirring chamber at the opening and discharge the crushed stones. Instead, it is only necessary to form a single opening in one end wall of the cylindrical drum, and the other end wall of the cylindrical drum can be effectively used for different purposes. Then, according to this, if a dust collector is attached to the other end wall of the cylindrical drum, the dust generated along with the stirring of the crushed stone will be collected by the dust collector, and the adverse effect of the dust on the stirring can be removed. .

[Brief description of drawings]

FIG. 1 is a front view showing the overall configuration of an apparatus according to the present invention.

FIG. 2 is a vertical cross-sectional side view of essential parts showing an internal state around one end wall of a cylindrical drum of the device according to the present invention.

FIG. 3 is a vertical sectional front view of a main part showing an internal state around a wall of one end of a cylindrical drum of an apparatus according to the present invention.

FIG. 4 is a vertical cross-sectional side view of essential parts showing an internal state around the other end wall of the cylindrical drum of the device according to the present invention.

FIG. 5 is a vertical cross-sectional front view of essential parts showing an internal state around the other end wall of the cylindrical drum of the device according to the present invention.

FIG. 6 is a vertical cross-sectional side view of an essential part showing the operation of the present invention.

FIG. 7 is a schematic front view showing crushed stone that has not been subjected to the stirring action by the manufacturing apparatus according to the present invention.

FIG. 8 is a schematic front view showing crushed stone (medium stone) after being subjected to a stirring action by the manufacturing apparatus according to the present invention.

FIG. 9 is a vertical sectional front view showing an apparatus for producing crushed sand for concrete using the medium stone obtained by the production apparatus according to the present invention.

[Explanation of symbols]

 10 Manufacturing Equipment 11 Cylindrical Drum 11a One End Wall of Cylindrical Drum 11b Other End Wall of Cylindrical Drum 12 Drive Device 21 Opening 23 Blade 24 Crushed Stone 28 Dust Collector

Claims (2)

[Scope of utility model registration request] 1. A device for producing medium stones, wherein a means for producing crushed sand for concrete by agitating raw sand and medium stones is used, and a cylindrical drum having a stirring chamber inside, A drive device for rotating the tubular drum, and an opening portion serving as an input port and a discharge port is provided at one end wall of the tubular drum, and the opening portion is provided from an inner surface of the one end wall of the tubular drum. A spiral blade is installed over the blade, and when the cylindrical drum is rotating forward, crushed stones are pushed into the center of the internal stirring chamber by the blade and when the cylindrical drum is rotating backward, the internal stirring chamber is rotated. An apparatus for producing a medium stone used in the production of crushed sand for concrete, wherein the shape of the blade is set so that the blade discharges the crushed stone from the opening. 2. The medium stone production apparatus for producing crushed sand for concrete according to claim 1, wherein a dust collector is attached to the other end wall of the cylindrical drum.