JPH02122844A - Rounding off of aggregate - Google Patents

Abstract

PURPOSE:To permit a continuous production of a good quality of roundish aggregate by moving obliquely upward the crushed stones in a tubular body arranged in a horizontal position and set in an up-and-down motion into collision with the upper inner wall thereof and moving them downward into collision with the lower inner wall thereof repeating this cyclic round-off operation. CONSTITUTION:Crushed stones, when introduced into a tubular body 1 set in a up-and-down motion by a crankless mechanism, are accelerated by the upward movement thereof to be raised from a bottom part thereof and then jumped up in the same direction as the tubular body 1 moves in an angular and linear up-and-down motion by a guide member 16 and a slidably movable member 14, i.e., in the upward direction at an angle. Upon the downward movement of the tubular body 1, the crushed stones are vigorously collided with the upper inner wall thereof in order for the angles of the stones to be rounded off and, after this collision, they are dropped into collision with the lower inner wall thereof to cause their angles to be further rounded off and again brought up by the tubular body 1. Thus, such a cyclic movement of the crushed stones against the tubular body is repeated to make the stones increasingly round and hence a suitable aggregate in making concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a decornering method for obtaining high-quality crushed stone aggregate.

[Conventional technology] Conventionally, concrete aggregates were made by collecting natural gravel and river sand from riverbeds and using these as aggregates, but recently it has become difficult to collect gravel and sand from riverbeds, and it has become difficult to collect gravel and sand from riverbeds. Artificially crushed rock is used as a substitute for natural gravel. However, artificially crushed rocks are flat or angular and cannot be considered high-quality aggregates.

It is a well-known fact in the industry that such flat or angular shapes pose problems in terms of concrete strength and concrete placement.

An impact crusher (mainly an impact crusher) is used to adjust the particle shape of this defective aggregate.

[Problem to be solved by the invention] However, even if this crusher is used, the impact force is large, so some crushed stones and flat objects are actively crushed, resulting in a large particle size distribution during supply and discharge. It is difficult to set the desired granularity. Moreover, since the number of collisions is small, within a few times, not all of the many corners can be removed, and for small particles, especially those with a diameter of 5 mm or less, the corner removal effect is not so great that it is not practical for use in concrete aggregates. Not only do impact-type taratushas have disadvantages in that they cannot be used due to their poor loading factor, but they also have problems such as high speed rotation, short lifespan of consumables, and high processing costs. Therefore, there is currently a strong demand from the industry for an apparatus for producing high-quality crushed stone aggregate at low processing costs, also from the perspective of effective use of limited natural resources.

The present invention has been developed in view of the above circumstances, and provides a method for reliably deshaping crushed stone aggregate (hereinafter referred to as raw material) to adjust the grain shape without significantly changing the grain size and at low cost. It is intended for that purpose.

[Means for Solving the Problems] In order to achieve the above object, in the corner cutting method of the present invention, a raw material is charged into a horizontally oriented cylindrical body that moves up and down, and this raw material is passed through the cylindrical body. The raw material is given acceleration due to the upward motion to cause it to rise diagonally upward and collide with the upper inner wall of the cylindrical body, and the falling raw material is further collided with the lower inner wall of the cylindrical body, and both collisions are alternately repeated many times. This is what I did.

[Function] With the horizontally oriented cylindrical body in operation, raw materials are introduced into the cylindrical body. The input raw material is given acceleration in the upward movement process of the vertically moving cylindrical body, and flies up in the upward movement direction of the cylindrical body. The flying raw material collides with the upper inner wall during the downward movement of the cylindrical body, and this impact breaks off the corners of the raw material, that is, the sharp points.

Further, the raw material after the collision falls and collides with the bottom inner wall of the cylindrical body, and the corner of the raw material 1 is removed again.

In this way, while the raw material moves through the cylindrical body while repeating the above-mentioned collisions many times, many corners are removed, and the grain shape is significantly improved.

Moreover, since this collision is a repetition of a head-on collision, there is little slippage of the raw material on the inner wall of the cylindrical body.

[Example] Examples will be described with reference to the drawings.

Figures 1 and 2 show an embodiment of the corner cutting device used in the method of the present invention, in which 1 is a cylindrical body supported horizontally and parallel to a support base 2 via a horizontal crankless mechanism 3; , has a supply port 4 on one side and an outlet 5 on the other side.

The support base 2 consists of a fixed base 6 and a tiltable movable base 8 whose one end is connected by a pin 7. A jack 9 is provided on the opposite side of the pin 7, and the jack allows the movable base 8 to be
The cylindrical main body 1 is adjusted to a predetermined inclination angle θ through the inclination angle θ. This angle can be set arbitrarily as long as the raw material does not move freely within the cylindrical body 1, but is preferably about 5°.

Further, the crankless mechanism 3 has the following configuration.

Reference numeral 10 denotes a (crankless) rotating shaft having eccentric portions 11 (at eccentricity ω) at both ends, and a pair of these shafts are provided near both ends of the movable base 8 in the length direction.

12 is a crankless rod with a ring portion 1 at one end of the rod.
3 and is connected to a sliding member 14 whose other end is fixed to the side wall of the cylindrical body 1 by means of a pin 15.

Reference numeral 16 denotes a guide member erected on the movable base 8, which guides the sliding member 1.
This is to restrict the movement direction of 4.

Reference numeral 17 denotes a drive motor placed in the center of the movable table 9, and the driving force of this motor is transmitted via a large wheel 18 and a belt 19 to rotate a small wheel 20 provided at one end of the dual rotation lTl 110. ing.

Further, 21 is a supply chute, which is fixed to the movable table 8 by a support member 23.

The raw material is introduced into the cylindrical body 1 from the supply port 4 while the drive motor 17 of the corner-cutting device configured as described above is started and the cylindrical body 1 is moved up and down via the crankless mechanism 3. Then, during the upward stroke of the cylindrical body 1, this raw material rises from the bottom of the cylindrical body 1 while being accelerated.

Next, the raw material is transferred to the guide member 1 near the top dead center of the cylindrical body 1.
The cylindrical body 1 moves linearly in the diagonal vertical direction by the sliding member 14 guided by the sliding member 6, that is, jumps upward diagonally. Then, the raw material flying in the above direction collides with the upper inner wall with force during the downward movement of the cylindrical body 1, and the corner of the raw material is broken off by the temporary impact force at this time.

After the collision, the raw material falls, collides with the bottom inner wall of the cylindrical body 1, and the corners are cut off, and is again raised by the cylindrical body 1.

Thereafter, as the raw material repeats the above-mentioned collision many times, many of its edges are dropped and it becomes rounded.

As described above, the sized raw material is discharged from the outlet 5 and becomes a product.

In this device, the cylindrical main body 1 performs a linear movement in an oblique direction via a sliding member 14 that slides along a guide member 16, and this movement increases the acceleration applied to the raw material, further enhancing the particle size regulating effect. improves.

Note that the number of collisions varies depending on the impact force at the time of collision, the properties of the raw material, etc., but is set within a range of about ten times to several hundred times.

Furthermore, although the crankless rotating shaft 10 has been described in the above embodiment, the same effect can be achieved even if a crankshaft is used instead of this shaft.

Furthermore, as shown in FIG. 3, as another corner cutting device for carrying out the method of the present invention, a lateral horizontal cylindrical body 1 is supported on a frame 2 via an elastic member 24, and the cylindrical body 1 is A main shaft 25 having a counterweight is provided, a flywheel and a V pulley 26 are provided at both ends of the main shaft 25, and the V pulley 26 is rotated by a drive motor 27 to cause the cylindrical body 1 to move circularly by the centrifugal force generated by the weight.

In the upward movement step of this movement, the raw material is raised diagonally upward with acceleration, and the cylindrical body 1, which is in the stationary step, collides with the material.

Note that the cylindrical main body 1 can be slightly inclined toward the discharge side.

Further, although the longitudinal section of the cylindrical body 1 is rectangular, it may also be circular.Furthermore, a horizontal partition wall is provided in the center of the cylindrical body 1 to divide it into upper and lower sections, and raw materials are introduced into each compartment. However, it is also possible to make the collision occur in two stages, upper and lower.

[Effects of the Invention] Since the present invention is configured as described above, the present invention has the following effects.

Raw materials are put into a horizontally oriented cylindrical body, and the cylindrical body moves up and down to cause them to collide alternately with the upper and lower inner walls of the cylindrical body, and this is repeated many times. Many edges are reliably removed, and 1 q of high-quality aggregate, which is sized into an extremely rounded shape, can be continuously produced.

Furthermore, since the raw material and the inner wall of the cylindrical body simply collide repeatedly, the impact energy can be used effectively, and there is almost no slippage between the two, resulting in significantly less wear on the inner wall of the cylindrical body.

Furthermore, since the raw material is made to collide with the upper inner wall of the cylindrical body, not only can the processing capacity be improved to a large IJ, but the length of the cylindrical body is shortened, and the cylindrical body can be moved up and down. The power consumption for this purpose is also small.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an example of a corner removing device used in carrying out the present invention, FIG. 2 is a view taken along the line A-A in FIG. 1, and FIG. It is a front view showing an example of this. 1... Cylindrical body 14... Circular member 17... Drive motor 3... Crankless mechanism 16... Guide member

Claims (1)

[Claims] A raw material is put into a horizontally facing cylindrical body that moves up and down, and the raw material is accelerated by the upward movement of the cylindrical body, causing it to rise diagonally upward, colliding with the upper inner wall of the cylindrical body, and then falling. Colliding the raw material to the lower inner wall of the cylindrical body,
A method for cornering crushed stone aggregate, characterized in that both collisions are alternately repeated many times.