JP2795370B2 - Crushed sand production equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushed sand production facility for use in mortars and other applications, and more particularly to a crushed sand production facility provided with a dispersing device in consideration of the even distribution of raw materials to a vibrating sieve.

[0002]

2. Description of the Related Art Conventionally, in order to produce crushed sand, as shown in FIG. 5, river gravel, land gravel, and crushed crushed stone are crushed and sieved in a first crushing plant, and then the raw material hopper 10 is crushed. After being stored in the vibrating feeder 20, the material is cut out by a vibrating feeder 20 and crushed by a rotary crusher 40 for crushed sand.
A closed circuit system was adopted in which the sieved product was sieved with a vibrating sieve 70 having a sieve mesh of 2.5 mm to obtain crushed sand of 2.5 mm or less, and the product on the sieve was returned to the rotary crusher 40 again.

[0003]

In order to supply raw materials to a vibrating sieve in such a crushed sand manufacturing facility, as shown in FIG. 6, for example, crushed products of a crusher are fed to a vibrating sieve 70 by a belt conveyor 50 or the like. The belt is conveyed, dropped freely from the head pulley of the belt conveyor 50, and supplied to the vibrating sieve 70 via the head chute 50a. However, in such a supply method, for example, as shown in FIG. 7, since the raw material falls concentrated at the center in the width direction of the vibrating sieve 70, a zone that is not sieved is generated on the upstream side of the vibrating sieve, and the sieving efficiency is increased. In addition, while the belt conveyor supply from the direction A in FIG. 7 has a good left and right distribution with the center as a boundary, the supply of the belt conveyor from the B direction does not Not evenly
There has been a problem that the sieving efficiency has been deteriorated since the sieving efficiency tends to be unevenly distributed above the paper surface.

[0004]

In order to solve the above-mentioned problems, in the present invention, a raw material hopper for receiving raw materials, a vibrating feeder for cutting out raw materials, a rotary crusher, and a crushed raw material are used. A crushed sand production facility comprising a vibrating sieve for sieving and a dispersing device for uniformly dispersing the raw material in the width direction of the vibrating sieve and supplying the raw material to the vibrating sieve. A pair of parallel receiving bars that are extended and separated by a predetermined distance are disposed in the casing, and a pair of receiving bars having the same shape as the first-stage receiving bar are respectively provided diagonally below left and right of the first-stage receiving bar. In which the receiving bar of the second stage is disposed.

[0005]

According to the present invention, the raw material supplied to the vibrating sieve enters the dispersing device, falls on a pair of first-stage receiving bars, and is deposited on the first-stage receiving bars. The raw material that flows on the outside of the gap and outside, and falls off on the outside, further falls onto the second stage receiving bar. Similarly, the second-stage receiving bar is divided into a raw material that falls through the gap between both receiving bars and a raw material that slides down the outside of the receiving bar. As described above, the raw material that has dropped near the center in the width direction of the vibrating sieve is almost uniformly dispersed in the width direction by obstacles formed by a pair of upper and lower receiving bars, and is supplied to the vibrating sieve.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 relate to an embodiment of the present invention.
1 is a flow sheet of a crushed sand production facility, FIG. 2 is a perspective view of a dispersing device and a vibrating sieve, FIG. 3 is a plan view of the dispersing device and a vibrating sieve, and FIG. 4 is a front view illustrating the flow of raw materials in the dispersing device.

In the figure, 10 is a raw material hopper, 20 is a vibration feeder, 30 is a belt conveyor, 40 is a rotary crusher, 50 is a belt conveyor for transporting crushed products, 6
Numeral 0 denotes a dispersing device, 70 denotes a vibrating sieve, 80 denotes a belt conveyor for transporting products below the sieve, and 90 denotes a belt conveyor for transporting products above the sieve. As shown in FIGS. 2 to 4, the dispersing device 60 includes a box-shaped casing 62 having a rectangular cross section and a pair of parallel receiving bars arranged horizontally and spaced apart at a fixed interval and along the material flow. The first step receiving bar 60a is disposed at the center of the upper part of the casing 62, and the second step receiving bar 60a
“b” is disposed diagonally below left and right of the first step receiving bar 60a. The lower part of the casing 62 has a reduced sectional area, and is arranged to face a bottom plate 70b of a stone box 70a provided on the inlet side of the vibrating sieve 70. A pair of receiving bars 60a,
The gap of 60b is desirably 2 to 3 times the maximum particle size of the raw material to be charged. First stage receiving bar 60a and second stage receiving bar 60b
As shown in FIG.
It is arranged so that the center of the raw material flowing outside 0a is near the center of the pair of second stage receiving bars 60b. Receiving bar 60
Although a and 60b may be flat plates, the use of a channel (channel) as shown in the figure not only increases the structural strength but also serves as a raw material reservoir and is convenient. With the angle of repose of the raw material formed in the raw material reservoir as a slide, the raw material sequentially supplied falls downward, and as a result, is uniformly and almost uniformly distributed in the width direction of the vibrating sieve 70. When the raw material is supplied to the upper center of the dispersion device 60 via a belt conveyor or the like, as described above, when the traveling direction of the belt conveyor is the direction A in FIG. However, the symmetry of the belt conveyor in the B direction is broken, and the belt conveyor tends to be unevenly distributed on the upper side of FIG. Therefore, in order to cope with such a phenomenon, the receiving bar 6
As shown in FIG. 3, a hydraulic cylinder 64 that translates the ends of the pair of receiving bars 60a, 60b in parallel with each other can be provided as shown in FIG. The hydraulic cylinder 64 can also be used when adjusting the mutual position of the first-stage receiving bar 60a and the second-stage receiving bar 60b, so that more uniform dispersion according to the raw material is possible.

As described above, by providing the dispersing device 60, the raw material supplied by the belt conveyor or the like falls on the stone box 70a of the vibrating sieve 70 while being uniformly distributed as shown in FIG. In addition, the sieving efficiency of the vibrating sieve can be improved.

[0009]

As described above, according to the present invention, since the crushed product of the rotary crusher is supplied to the vibrating sieve through the dispersing device, uniform distributed supply in the width direction of the vibrating sieve becomes possible. The impact of falling on the sieve is reduced to protect the equipment, and the sieving efficiency of the vibrating sieve is significantly improved. Therefore, the productivity of crushed sand increases. In addition, it is possible to supply the vibrating sieve from any direction, and the layout selection range is expanded.

[Brief description of the drawings]

FIG. 1 is a flow sheet of a crushed sand production facility according to an embodiment of the present invention.

FIG. 2 is a perspective view of a dispersion device and a vibrating sieve according to an embodiment of the present invention.

FIG. 3 is a plan view of a dispersion device and a vibrating sieve according to an embodiment of the present invention.

FIG. 4 is a front view illustrating a flow of raw materials in the dispersion apparatus according to the embodiment of the present invention.

FIG. 5 is a flow sheet of a conventional crushed sand production facility.

FIG. 6 is an explanatory diagram showing a state of supplying raw materials to a conventional vibrating sieve.

FIG. 7 is an explanatory diagram showing a raw material flow on a conventional vibrating sieve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crushed sand manufacturing equipment 10 Raw material hopper 20 Vibration feeder 30 Belt conveyor 40 Swiveling crusher 50 Belt conveyor 50a Head chute 60 Dispersing device 60a First stage receiving bar 60b Second stage receiving bar 62 Casing 64 Hydraulic cylinder 70 Vibrating sieve 70a Stone box 70b Bottom plate 72 Sieve mesh 80 Belt conveyor 90 Belt conveyor

Claims (1)

(57) [Claims] 1. A raw material hopper for receiving a raw material, a vibrating feeder for cutting out the raw material, a rotary crusher, a vibrating sieve for sifting the raw material after crushing, and uniformly dispersing the raw material in a width direction of the vibrating sieve. And a dispersing device for supplying the vibrating sieve to the vibrating sieve, wherein the dispersing device is a pair of parallel receiving bars extending horizontally in the raw material flow direction of the vibrating sieve, and separated by a predetermined distance. Are disposed in the casing, and the first
A crushed sand production facility comprising a pair of second stage receiving bars having the same shape as the stage receiving bar.