JP3633694B2 - Bulk recovery sand crusher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crusher that prevents the collected sand and collected gravel from being fed to a ready-mixed concrete production plant in a lump.
[0002]
[Prior art]
As is well known in the ready-mixed concrete factory, sand and gravel are separated and recovered from the return concrete returned as surplus from the concrete mixer truck, and the recovered sand and collected gravel are reused as concrete aggregate. By the way, especially when using recovered aggregates such as recovered sand and recovered gravel, if any cement remains in the aggregates, it is easy to form lumps, which remain in the solidified state in the cement mixer. In some cases, such a mass having a diameter of several centimeters may remain unbroken even in the mixer, which may be mixed into the product and cause a defect that significantly reduces the strength of the concrete.
[0003]
[Problems to be solved by the invention]
Therefore, the present invention is intended to provide a lump recovery sand crusher that can reliably crush the aggregate of collected aggregates such as the collected sand or the collected gravel as described above with a simple device.
[0004]
[Means for Solving the Problems]
For this purpose, the lump-recovered sand crusher of the present invention is provided with a pair of crushing rollers in a saddle-shaped hopper into which recovered sand or recovered gravel is charged, and an impeller in the middle lower part of both crushing rollers. And a motor for rotating the crushing roller and the impeller, and a pair of movable side wall plates that make the hopper inner space from the crushing roller to the impeller wide and narrow are advanced into the hopper. It is characterized by being hinged on both side walls.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of the lump-recovered sand crusher, FIG. 2 is an external front view thereof, and FIG. 3 is a sectional view taken along line AA of FIG. The saddle-shaped hopper 1 has a rectangular tube shape with a feeding portion 2 provided at the upper end, and a pair of crushing rollers 3 and 4 are provided in the saddle-shaped hopper 1. Reference numeral 5 denotes a lattice-shaped strainer provided on the upper portion of the saddle type hopper 1. As shown in FIG. 4, each of the crushing rollers 3 and 4 is formed by fixing a square bar 8 to the outer periphery of a cylinder 7 provided on the rotary shaft 6 at regular intervals. A rotating shaft 6 of one crushing roller 3 is rotatably supported by a bearing 10 fixed to a side wall of the bowl-shaped hopper 1 via a mounting plate 9, and a sprocket 11 is provided at one end of the rotating shaft 6. It is fixed. The rotation shaft 6 of the other crushing roller 4 passes through an arc-shaped long hole 12 formed in the side wall of the bowl-shaped hopper 1 and is rotatably supported by a bearing 14 provided at the tip of an arm 13. A sprocket 15 is fixed to one end of the rotating shaft 6. The arm 13 is pivotally supported by a support shaft 16 projecting from the outer surface of the side wall of the hopper 1, and 17 is an air cylinder for swinging the arm 13. Therefore, when the arm 13 is swung by the air cylinder 17, the rotating shaft 6 moves in the long hole 12, and the crushing roller 4 moves as shown by a one-dot chain line in FIG. The interval 19 can be freely adjusted. Reference numeral 18 denotes a sealing plate provided on the outside of the hopper 1 so as to be movable along the rotary shaft 6 in order to prevent sand leakage from the long hole 12.
[0006]
Reference numeral 20 denotes an impeller provided in the middle lower part of both the crushing rollers 3 and 4 in the hopper 1, and the impeller 20 has an outer periphery of a cylinder 22 from which a rotating shaft 21 protrudes from both end faces as shown in FIG. A plurality of blades 23 project radially from the surface, and the rotary shaft 21 is rotatably fixed to a bearing 25 fixed to the side wall of the hopper 1 via a mounting plate 24. A sprocket 26 is fixed to one end of the. A tension sprocket 27 is provided on the outer surface of the hopper 1.
[0007]
Reference numeral 30 denotes a geared motor supported by a stand 35 on the outer side of the hopper 1 so that its rotation output shaft is concentric with the support shaft 16, and 31 and 32 are sprockets fixed to the rotation output shaft. An endless conductive chain 33 is wound around the sprocket 31 and the sprocket 15, and an endless conductive chain 34 is wound around the sprocket 31, the sporocket 11, the sprocket 26, and the sprocket 27. For this reason, the crushing rollers 3 and 4 and the impeller 20 are rotated in the direction of the arrow through the conductive chains 33 and 34 by driving the motor 30, respectively.
[0008]
A pair of movable side wall plates 41 are suspended from both side walls 1a and 1b of the hopper 1 via hinges 40, and the operating shafts of a pair of air cylinders 43 supported by a frame 42 on the outside of the hopper 1 are respectively movable. The movable side wall plate 41 is connected to the outer surface of the side wall plate 41 and the air cylinder 43 is operated so that the movable side wall plate 41 advances into the hopper 1 and the space in the hopper 1 from the crushing rollers 3 and 4 to the impeller 20 is movable. The side wall plate 41 can be varied in width.
[0009]
In the lump collected sand crusher configured as described above, if the collected sand or collected gravel is put into the hopper 1 from the belt conveyor 50, the lump is sandwiched between the rotating crushing rollers 3 and 4 and crushed. Further, the one dropped from between the crushing rollers 3 and 4 hits the rotating impeller 20 and is further crushed by the impact.
[0010]
At this time, since the distance 19 between the crushing rollers 3 and 4 can be adjusted by the air cylinder 17, if the sand is set narrow and the gravel is set wide, the crushing process can be performed without biting even large gravel. Further, by adjusting the advance position of the movable side wall plate 41 into the hopper 1 by the air cylinder 43, the gap between the outer periphery of the crushing rollers 3, 4 and the movable side wall plate 41 is adjusted. The lump or the like can be reliably crushed without passing through the gap, and the recovered aggregate without the lump can be fed from the discharge port 45 to the ready-mix manufacturing plant.
[0011]
【The invention's effect】
As described above, in the present invention, the recovered aggregate can be crushed regardless of the size of the particles by adjusting the distance between both crushing rollers and the advance of both movable side wall plates. Recovered gravel also has the beneficial effect of reliably crushing the mass and allowing these recovered aggregates to be used safely.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a lump recovery sand crusher according to the present invention.
FIG. 2 is an external front view of the lump recovery sand crusher shown in FIG.
3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a perspective view of a crushing roller.
FIG. 5 is a perspective view of an impeller.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vertical hoppers 3, 4 Crushing roller 19 Space | interval 20 Impeller 30 Motor 40 Hinge 41 Movable side wall board

Claims (1)

A pair of crushing rollers are provided in the saddle-shaped hopper into which the collected sand or collected gravel, etc. is charged, so that the distance between them can be adjusted. A motor that is moved, and a pair of movable side wall plates that allow the inner space of the hopper from the crushing roller to the impeller to be widened and narrowed are hinged to both side walls of the hopper so as to advance into the hopper. Lump recovery sand crusher.

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