JP2006167646A - Concrete scrap regeneration facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably obtain regenerated aggregate of high quality in a concrete scrap regeneration facility using an eccentric rotor type vertical crusher. <P>SOLUTION: Water is sprayed for a prescribed time to regenerated aggregate B discharged from the eccentric rotor type vertical crusher 1; color tone of the aggregate B is photographed by a CCD camera 29; the amount of attached mortar as quality information is estimated from the color tone data; the outer cylinder 13 of the crusher 1 is vertically moved on the basis of the estimated amount of attached mortar; and the width of a gap 20 between its lower end and a collar-like ring provided at the lower part of the rotor 11 is varied to adjust retention time of concrete mass A becoming the raw material of the regenerated aggregate B, in the crusher 1. Thus, the mortar can be sufficiently removed from the concrete mass A to stably obtain regenerated aggregate B of high quality. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to equipment for producing recycled aggregate by reclaiming cement and concrete waste.

  In recent years, the production volume of cement and concrete (hereinafter also referred to simply as “concrete”) has increased to 500 to 600 million tons / year, and natural destruction due to the collection of natural resources such as gravel as the aggregate has become a problem. Yes. For this reason, recycled aggregate made from concrete waste in construction waste has been manufactured, but recycled aggregate produced in a recycling facility that only crushes concrete waste is cement mortar with a high water absorption rate. (Hereinafter simply referred to as “mortar”) is attached, has a large shrinkage during drying, and has low resistance to frost damage. Therefore, it cannot be used for structural concrete, and roadbed materials, backfill materials, etc. Has been diverted to.

  Therefore, in order to produce high-quality recycled aggregates that can also be used for structural concrete, various recycling treatment facilities that can remove cement mortar from concrete waste have been developed. Among them, the equipment using the vertical crusher that makes the concrete lump obtained by roughly crushing the concrete waste material frictionally contact each other between the outer cylinder and the eccentric rotor provided on the inside is relatively low cost and efficient. Removal can be performed (for example, refer to Patent Documents 1 and 2).

However, even in the regeneration processing facility using the above-described eccentric rotor type vertical crusher, depending on the operating conditions such as the rotational speed of the rotor of the vertical crusher, the torque of the motor driving the rotor, the supply amount of the concrete block, etc. There is a case where the removal of the steel becomes insufficient and the quality of the recycled aggregate is deteriorated.
JP 2001-239250 A Japanese Patent Publication No. 6-30755

  An object of the present invention is to stably obtain a high-quality recycled aggregate in a concrete waste recycling process facility using an eccentric rotor type vertical crusher.

  In order to solve the above problems, the present invention provides a concrete lump that is roughly crushed from cement / concrete waste material to a predetermined size, and an outer cylinder formed in the upper part of the casing of the vertical crusher and an eccentric rotation inside the outer cylinder. Concrete waste recycling process for producing recycled aggregate by removing cement mortar from the concrete lump by supplying it between the cylindrical rotors that are possible and rotating the rotor eccentrically to bring the concrete lump into frictional contact. In the facility, the residence time of the concrete block in the vertical crusher is adjusted based on the quality information of the recycled aggregate discharged from the vertical crusher.

  That is, when the information that the quality of the recycled aggregate discharged from the vertical crusher is deteriorated, the residence time in the vertical crusher of the concrete block that is the raw material of the recycled aggregate is lengthened. As a result, the quality of the recycled aggregate was stabilized by sufficiently removing the mortar from the concrete block regardless of the operating conditions of the vertical crusher.

  As means for adjusting the residence time of the concrete block in the vertical crusher, a vertical ring facing the lower end of the outer cylinder in the axial direction is provided at the lower part of the rotor of the vertical crusher, and the outer cylinder is By moving up and down, it is possible to adopt a device that changes the width of the gap between the lower end thereof and the bowl-shaped ring.

  Further, as quality information of the aggregate discharged from the vertical crusher, water is sprayed on the recycled aggregate that has been screened from cement mortar on the downstream side of the vertical crusher for a predetermined time, and the color tone is image sensor. It is advisable to adopt the amount of cement mortar adhesion estimated from the results of measurement in (1).

  Further, the width of the gap between the lower end of the outer cylinder of the vertical crusher and the bowl-shaped ring is determined by the rotational speed of the rotor, the output current value of the motor that drives the rotor, and the concrete mass between the outer cylinder and the rotor. It is desirable to set the supply amount as a parameter.

  Here, the rotational speed of the rotor may be measured by sensing the passage of a plurality of detectors attached to the lower surface of the bowl-shaped ring with a sensor provided below the bowl-shaped ring.

  As described above, the concrete waste material recycling treatment facility of the present invention is based on the quality information of the recycled aggregate discharged from the vertical crusher, and stays in the vertical crusher of the concrete block that becomes the raw material of the recycled aggregate. Since the time is adjusted, the mortar can be sufficiently removed from the concrete block regardless of the operating conditions of the vertical crusher, and high-quality recycled aggregate can be stably obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, this concrete waste material recycling treatment facility supplies a concrete lump A obtained by roughly crushing cement / concrete waste to an eccentric rotor type vertical crusher 1. Cement mortar is removed from this to produce recycled aggregate B. Horizontal vibratory sieve 2 that screens aggregate B and mortar as products on the downstream side of vertical crusher 1, and bone after screening An image sensor unit 3 for measuring the mortar adhesion amount as quality information of the material B, and a plant control panel 4 for adjusting the residence time of the concrete block A in the vertical crusher 1 based on the measured mortar adhesion amount, etc. It has.

  The concrete block A which is the raw material of the recycled aggregate B is roughly crushed with a crusher such as a jaw crusher (not shown) from the concrete waste in construction waste, and has a predetermined size, as shown in FIG. Then, after being transported by the supply conveyor 5 and once stored in the hopper 6, it is fed into the vertical crusher 1 by a feeding feeder 7 provided below the discharge port of the hopper 6.

  As shown in FIG. 2, the vertical crusher 1 includes a cylindrical rotor 11 that is eccentrically inserted by a predetermined amount in a main shaft 10 that is connected to a motor 9 by a belt 8, inside an outer cylinder 13 of a casing 12. It is provided so as to be able to rotate eccentrically, and the rotor 11 is driven by the motor 9 to rotate eccentrically, whereby the concrete blocks A supplied between the outer cylinder 13 and the rotor 11 are brought into friction contact with each other. The mortar having a lower strength than the mortar is selectively pulverized or crushed, and is removed by pulverizing or pulverizing the mortar to a size that can be easily sieved with the aggregate B.

  The outer cylinder 13 is slidably fitted on the inner periphery of a fixed cylinder 14 provided on the upper part of the casing 12, and is hydraulically supplied to one of two annular pressure oil chambers 15, 16 formed between the outer cylinder 13 and the fixed cylinder 14. The hydraulic fluid is moved up and down by sending hydraulic oil from the pump 17 through the electromagnetic valve 18. On the other hand, the lower part of the rotor 11 is provided with a bowl-shaped ring 19 which is opposed to the lower end surface of the outer cylinder 13 in the axial direction. By raising and lowering the outer cylinder 13, the width of the gap 20 between the lower end and the bowl-shaped ring 19 is provided. Can be changed.

  The rotor 11 rotates in the same direction as the main shaft 10 because a rotational force acts in the rotational direction of the main shaft 10 when there is no load, but a crushing component force acts in a direction opposite to the rotational direction of the main shaft 10 when loaded. Therefore, it rotates at a low speed in the direction opposite to the main shaft 10. As shown in FIG. 3, nine detection bodies 21 are attached to the lower surface of the bowl-shaped ring 19 at equal intervals in the circumferential direction, and below the bowl-shaped ring 19, the detection bodies 21 are rotated by the rotation of the rotor 11. Three sensors 22 are provided at positions corresponding to the passing trajectory at different intervals. These sensors 22 sense the detection body 21 passing over the sensor 22 to detect the rotational direction of the rotor 11, that is, the load state. Is detected indirectly, and the rotational speed of the rotor 11 can be measured by counting the number of times the detection body 21 passes. Note that the number of installations and the installation intervals of the detection bodies 21 and the sensors 22 are not limited to the example shown in FIG. 3, and for example, the sensor 22 can be devised by making the installation intervals of the detection bodies 21 larger than the installation intervals of the sensors 22. The number of installations can also be reduced.

  As shown in FIG. 1, the horizontal vibrating screen 2 is configured to remove the aggregate B and the mortar conveyed by the discharge conveyor 23 and the rotary bucket conveyor 24 provided on the downstream side of the vertical crusher 1. Sieving. At this time, together with the mortar, the aggregate that is smaller than the predetermined size and is not a product is also screened out. On the other hand, the aggregate B remaining on the sieve 2 is conveyed by the product conveyor 25 and discharged to the damper 26, and then stored as a product.

  Further, the image sensor unit 3 sprays water on the aggregate B transported by the product conveyor 25 by the watering unit 27 for a predetermined time, and irradiates light from the light source 28 to the aggregate B that has absorbed water. The color tone of B is photographed by a CCD camera 29 as an image sensor, and the color tone data sent from the CCD camera 29 is converted into a mortar adhesion amount by estimation by the arithmetic unit 30.

  Here, the conversion from the color tone data of the aggregate B to the mortar adhesion amount is estimated using the fact that the lighter white portion is photographed more as the aggregate B has a smaller mortar adhesion amount with a high water absorption rate. However, the relationship between the mortar adhesion amount and the color tone of the aggregate B varies considerably depending on the water absorption amount. Therefore, in this image sensor unit 3, using an aggregate sample in which the mortar adhesion amount was strictly measured separately, an experiment was performed to measure the mortar adhesion amount by variously changing the watering time, and the measured value was changed to a strict measurement value. The closest watering time was set in actual operation.

  In addition, as means for obtaining the quality information of the aggregate B discharged from the vertical crusher 1, in consideration of the accuracy of the quality information, the required time and the cost, the method using the above image sensor was adopted. In addition to this, a method of measuring the temperature of the aggregate B with a thermo viewer, a spectrum analysis method using the amount of passage of X-rays or the like of the aggregate B or reflection properties, and a method of measuring the specific gravity of the aggregate B for each particle size distribution A mortar dissolution sampling method in which the mortar adhering to the aggregate B is dissolved and removed with hydrochloric acid or the like and its weight is measured, a method of calculating energy used for crushing from the motor output, a method combining these, and the like It can also be adopted.

  Then, the plant control panel 4 sends an operation signal to the vertical crusher 1 based on the mortar adhesion amount data sent from the image sensor unit 3, and moves the outer cylinder 13 up and down to lower the bottom and the bowl-shaped ring. The residence time of the concrete block A in the vertical crusher 1 is adjusted by changing the width of the gap 20 with respect to 19. That is, when the mortar adhesion amount of the aggregate B increases, the outer cylinder 13 of the vertical crusher 1 is lowered to narrow the width of the gap 20 between the lower end and the bowl-shaped ring 19, By making the residence time in the mold crusher 1 longer, the mortar is sufficiently removed.

  At this time, the set values of the width of the gap 20 between the lower end of the outer cylinder 13 and the bowl-shaped ring 19 of the vertical crusher 1 are the rotational speed of the rotor 11, the output current value of the motor 9 that drives the rotor 11, and the outer cylinder 13. The concrete lump supply amount between the rotor and the rotor 11 is determined as a parameter, and a concrete lump residence time during which sufficient mortar removal is efficiently performed according to the operating conditions of the vertical crusher 1 is obtained. . The concrete lump supply amount is measured by a level sensor 31 provided above the vertical crusher 1.

  The plant control panel 4 also has a function of controlling the speed of the input feeder 7 based on the output of the level sensor 31 to adjust the amount of concrete lump supplied to the vertical crusher 1. That is, when the residence time of the concrete block A in the vertical crusher 1 is lengthened, the speed of the input feeder 7 is reduced to suppress the supply of the concrete block A.

  This concrete waste material recycling treatment equipment has the above-described configuration, measures the mortar adhesion amount of the recycled aggregate B discharged from the vertical crusher 1, and based on the measured value, the vertical crusher 1 of the concrete block A Since the residence time in the interior is adjusted, the mortar from the concrete block A can be sufficiently removed regardless of the operating conditions of the vertical crusher 1, and the high-quality recycled aggregate B can be stabilized. Can be obtained.

Schematic of the concrete waste material recycling treatment facility of the embodiment Front sectional view of the vertical crusher of FIG. Explanatory drawing of the rotor rotational speed measuring method of the vertical crusher of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vertical crusher 2 Sieve 3 Image sensor unit 4 Plant control board 7 Input feeder 9 Motor 11 Rotor 12 Casing 13 Outer cylinder 19 Cascade ring 20 Crevice 21 Detector 22 Sensor 27 Watering unit 28 Light source 29 CCD camera 30 Arithmetic unit 31 Level sensor A Concrete block B Aggregate

Claims (5)

  A concrete lump that is roughly crushed from cement / concrete waste and is sized to a specific size is supplied between an outer cylinder formed in the upper part of the casing of the vertical crusher and a cylindrical rotor that can be rotated eccentrically. In a concrete waste material recycling treatment facility for producing recycled aggregate by removing cement mortar from a concrete block by rotating the rotor eccentrically to bring the concrete blocks into frictional contact, the regeneration discharged from the vertical crusher A concrete waste recycling treatment facility characterized in that the residence time in a vertical crusher for a concrete block is adjusted based on aggregate quality information.   The means for adjusting the residence time of the concrete block in the vertical crusher is provided with a vertical ring facing the lower end of the outer cylinder in the axial direction at the lower part of the rotor of the vertical crusher, and the outer cylinder is moved up and down. The concrete waste recycling treatment facility according to claim 1, wherein the width of the gap between the lower end of the ring-shaped ring and the lower ring is changed.   The quality information of the reclaimed aggregate discharged from the vertical crusher is sprinkled for a specified time on the regenerated aggregate screened with cement mortar on the downstream side of the vertical crusher, and the color tone is measured with an image sensor. The concrete waste material recycling treatment facility according to claim 1, wherein the cement mortar adhesion amount is estimated from the result of the analysis.   The width of the gap between the lower end of the outer cylinder and the bowl-shaped ring of the vertical crusher, the rotational speed of the rotor, the output current value of the motor that drives the rotor, and the amount of concrete lump supplied between the outer cylinder and the rotor Is set as a parameter, the concrete waste material recycling treatment facility according to claim 2 or 3.   The rotational speed of the rotor is measured by sensing the passage of a plurality of detectors attached to the lower surface of the hook-shaped ring with a sensor provided below the hook-shaped ring. Concrete waste material recycling treatment facility described.

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