JPS5826976B2 - Grinding material particle shape adjustment method - Google Patents

Description

[Detailed description of the invention] Explanation of the gist This invention applies a grinding member such as an oscillating grinding plate to a primary crushed material that has been subjected to a normal crushing action by a compression type crusher such as a show crusher or a cone crusher. This invention relates to a method for adjusting the particle shape of a ground material, in which a grinding action is added to adjust the particle size and shape to produce a ground product with a particle shape that approximates the natural particle shape of fine aggregate, etc. The granular material ground by the crushing member is placed and discharged on a feeder such as a belt feeder facing the discharge opening, and is allowed to accumulate in a predetermined position, so that the grinding function is sufficiently affected by the particle shape adjustment. This invention relates to a grain shape adjustment method.

Conventional technology Conventionally, in so-called compression type crushers such as brake crushers, single toggle crushers, gyratory crushers, and cone crushers, the action based on their structure is to input bulk raw materials from above that are larger than the outlet gap and compress and crush them. It is used in the production of aggregates for construction materials, etc., and is widely adopted due to its advantages such as low product cost and maintenance cost because the consumable parts are located low. Yes.

This compaction type crusher swings one or both of the pair of opposing crushing surfaces to intermittently expand and contract the crushing gap, thereby creating a lower outlet between the two crushing surfaces. It is designed and operated in such a way that the above-mentioned input bulk material larger than the gap is fed, compressed and crushed, and the crushed particles are smoothly discharged from the outlet gap by gravity.

Problems with the Prior Art Therefore, basically, the filling rate of crushed particles in the crushing gap is low, and the state in which the crushed particles are interposed in the crushing gap is a state in which a single layer is formed, filled and fed, so that the particles do not interact with each other during the crushing process. There is virtually no abrasion or compression-grinding action between the particles, and as a result, many of the particles are flat or have long flaws along the crushing gaps, and the raw materials are in a coarsely crushed state or are caused by secondary crushing, etc. This method has the disadvantage of producing irregularly shaped crushed materials with many sharp points.

Therefore, when the seed-produced crushed material is used, for example, as concrete aggregate, pore changes during concrete curing,
There is a risk that troubles such as the sharp protrusion protruding from the surface may occur, and therefore, there is a drawback that it is impossible to use the product as it is as a final product such as a construction material.

However, from the perspective of demand for construction materials, etc., there is an extremely strong need for natural cobblestones and sand-like artificial coverings due to various conditions.

By the way, although it is possible to recycle the crushed products and pass them through the compression type crusher multiple times, most of the products simply pass through the exit gap smoothly due to gravity, and therefore there is no particle shape adjustment function. However, even if it is formed into a series double membrane plant, there is no substantial difference, and the disadvantage is that only the initial cost and running cost are high.

In addition, in order to obtain fine particles equivalent to the ground product produced by a grinder, the outlet gap must be designed to be narrow.
In this type of design, the crushed material that has been crushed during the passing process becomes firmly solidified during the compression stroke, causing a so-called bucking phenomenon, which inconveniences that excessive loads are placed on each mechanical part, making actual operation impossible. be.

To deal with this, the primary crushed product from the above compression type crusher is fed to an impact type crusher to improve the coarse particle shape, or to a rod mill or ball mill to improve the fine particle shape. Techniques have also been adopted to do this.

However, in the former case, the impactor, impact plate, and collision plate are extremely worn, and the degree of wear is proportional to the degree of grain shape improvement, leading to increased maintenance costs and frequent suspension of operations for repairs. In addition to this disadvantage, it is also disadvantageous that it is not very effective in improving grain size of 5 mm or less.

On the other hand, as is well known, in rod mills and ball mills, the efficiency consumption is extremely high, and therefore, in addition to the disadvantage of high running costs, there has been a problem of prudence requiring readjustment such as classification of fine particles.

OBJECT OF THE INVENTION The object of the present invention is to solve the technical problem of improving the particle shape in the production of materials for crushed materials based on the above-mentioned prior art, and to solve the problem of improving the particle shape in the production of materials for crushed materials based on the above-mentioned prior art. It is an object of the present invention to provide an excellent method for adjusting the particle shape of crushed materials, which is useful for the field of utilization of crushed materials in the construction industry, by allowing the crushed materials to accumulate between moving members and sufficiently adjusting the particle shape.

Structure of the Invention In order to solve the above-mentioned problems, the structure of the present invention, which is in accordance with the above-mentioned object and whose gist is the scope of the above-mentioned claims, is to supply a primary crushed material crushed in a predetermined manner by a cone crusher or the like from above, and to provide a pair of relative shakers. In the process of grinding in the grinding gap between the moving parts and discharging it by a feeder that faces from the lower opening through a predetermined gap, the grinding process is performed at a constant speed or by adjusting the discharge speed of the feeder. A clogging effect of the crushed material occurs, and the clogging effect causes stagnation in the flow of the crushed material, and thus,
In the residence process, the weak points are crushed by the sliding contact between the ground materials and the compression grinding action, and the sharp points are ground and the entire surface is preferentially ground, and the preferential grinding is always carried out in a full state. We have taken technical measures to ensure stable discharge based on the mutual rest conditions of the ground materials and the delivery conditions of the feeder.

Configuration of the Embodiment Next, an embodiment of the present invention will be described below with reference to the drawings.

To begin with, an embodiment of the basic principle of the present invention will be described. In FIGS. 1a and 1b, a pair of opposing grinding members 2, 2' are moved by swinging mechanisms 3, 3' as appropriate with respect to opposing solid walls 1.1'. A belt-type feeder is allowed to swing relative to each other with a predetermined stroke, and faces the lower opening 5 of the closed grinding gap 4 through a discharge gap 6.

Therefore, in this embodiment, the material to be processed is put into the grinding gap 4, and the material to be processed is compressed, crushed, broken, and polished by the swinging movement of the grinding members 2 and 2' toward and away from each other. However, due to the set speed of the feeder 7, the ground material is deposited on the feeder and the discharge is blocked at the opening 5, so that the stagnation spreads to the grinding gap 4.
Therefore, the above-mentioned preferential grinding is promoted, the particle shape and particle size are adjusted, and a circular particle-shaped ground material is discharged by the feeder 7.

Effects of the Embodiment In the above-described configuration, when the primary crushed material A as a workpiece crushed into predetermined chunks by a show crusher or the like is supplied to the grinding gap 4, the grinding material is repeatedly oscillated by the oscillating mechanism 3'. Due to the expansion and contraction of the crushing member 2' with respect to the fixed crushing member 2, the secondary crushed object A receives the choke influence from the feeder 7 as described above and is repeatedly compressed, crushed, broken, and abraded, resulting in an acute-angled protrusion. The particles are smoothed, long scratches are broken, and the particle size is adjusted to a uniform circular shape as a whole, and the particles are discharged from the opening 5. However, as described above, the set speed of the feeder 7 also causes the crushed material to be disposed of in the discharge gap 6. B stagnates and accumulates, and therefore, the accumulated choke spreads to the grinding gap 4 and promotes the preferential grinding.

In this manner, the ground material B whose particle size has been adjusted to be uniform is carried out from the feeder 7 in a predetermined manner.

The degree of grain shape adjustment is determined by the speed at which the feeder 7 is discharged, and also by the distance to the discharge gap 6 and the degree of inclination.

In another embodiment, in the embodiment shown in FIGS. 2a and 2b, a rotating grinding member 2'' forms an expanding and contracting grinding gap 4' in a closed space formed by a fixing member 2° having a circular cross section, and the lower end thereof is opened. An apron-type feeder 7' faces 5' through a discharge gap 6'.

Therefore, in this embodiment as well, the choke action on the grinding gap 4' through the discharge gap 6' of the apron-type feeder 7' causes repeated compression, crushing, and
There is no difference in the functions of providing fracture, abrasion, and, as a result, grain shape adjustment.

In principle, the feeder is not limited to the above belt type feeder 7 or apron type feeder 7', but may also be a vibrating type feeder 7'' as shown in Fig. 3, which is left to the mechanical design. Moreover, the discharge speed can be adjusted to a predetermined value according to the particle shape adjustment.

Furthermore, the degree of inclination and proximity of the feeder to the openings 5, 5' significantly affect the resting conditions and can therefore be subject to design.

Other Embodiments Next, as a concrete example, the actual mode of the brake crusher type shown in FIG. It is connected to a swinging mechanism 3' linked to an appropriate drive source so as to be able to swing freely for expansion and contraction, and a belt-type feeder 7 is connected to the lower end opening 5 of the grinding gap 4 through a set discharge gap 6. It is set up oppositely.

The feeding speed of the belt between driven pulleys 8' of the feeder 7 is appropriately adjusted by a drive pulley 8 whose speed is regulated by a continuously variable transmission mechanism (not shown).

Depending on the design, it is possible to adjust the position of the belt feeder 7 to adjust the discharge gap and inclination.

Effects of the Invention As described above, according to the present invention, in the method for adjusting the particle shape of the ground material, the material to be processed, which has been ground and crushed by the oscillating grinding member, is prevented from being discharged in a natural flow manner by the feeder, and the blockage effect is prevented. Therefore, the grinding action of the grinding member in the grinding gap applies compression, crushing, breaking, and abrasive actions to the workpiece based on the filling state that is affected by the clogging action, thereby achieving preferential grinding. As a result, the sharp points of the object to be processed can be smoothed, long objects can be crushed into uniform sizes, and further, by mutual polishing, the ground objects can be made into cobblestone-like granules.

Therefore, granular materials such as fine aggregate can be manufactured in one-pass processing, without the need for subsequent processing such as rod mills, which has the advantage of requiring less man-hours, yielding well, and consuming less power.

In addition, the feeder that closes the opening by preferential grinding can adjust the closing conditions steplessly by adjusting its delivery speed through stepless adjustment, and the preferential grinding can be adjusted and controlled. Not only that, but by operating the feeder, it also acts to break the rest of the fixed blocking mechanism.
From this point of view as well, stable grain shape adjustment without variation can be performed.

Furthermore, the above-mentioned feeder does not require special manufacturing or machining to attach it, and can be a conventional one, so there is an advantage that there is no particular cost increase.

[Brief explanation of drawings]

The drawings are detailed explanatory diagrams of this invention, and include 1 a,
Figure 2a is an explanatory diagram of an embodiment of the principle, and Figure 1b. 2b is a cross-sectional view of FIGS. 1a and 2a, respectively, FIG. 3 is an explanatory diagram of another embodiment of the feeder, and FIG. 4 is an explanatory diagram of the operation of one embodiment. A...Crushed material, 2, 2o, 2', 2"...
... Swinging crushing member, 4, 4'... Gap, 5,
5', old...opening, 7.7',? "... Feeder, 6,6'... Discharge gap, B... Ground material.

Claims (1)

[Claims] 1. In a method for adjusting the particle shape of a crushed material in which the crushed material is charged into a gap between the oscillating grinding members, ground, and then dropped from a lower opening into a feeder through a discharge gap and discharged, the discharged ground material is A method for adjusting the particle shape of the ground material, wherein the ground material is deposited on the feeder by adjusting the discharge speed of the feeder, and the ground material is stagnated in the grinding gap by closing the opening.