JPH0160604B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to an apparatus for manufacturing asphalt composite material, which is a road paving material, and in particular to a dryer capable of heating both new aggregate and asphalt pavement waste material. This relates to a material supply device for.

(b) Prior art Asphalt pavement waste material (hereinafter referred to as "waste material") dug up during road construction, etc. can be fully used if it is heated and regenerated, and is generally put into a dryer, which is a heating device, together with new aggregate. A method has been adopted in which a predetermined amount is put in and reused. The feed ratio of new aggregate to waste material to the dryer is controlled by the operator by appropriately setting the speed adjustment of the material cutting feeder of each storage hopper on the control panel.

(c) Problems to be solved by the invention When material is cut out from the storage hopper by adjusting the speed of the material cutting feeder, the amount of cut out varies depending on the condition of the material etc. It is difficult to maintain a constant supply ratio of wood and waste material, and it is doubtful whether the asphalt mixture produced thereby has the desired mixing ratio.

(d) Means for solving the problem The present invention is designed to accurately control the supply ratio of new aggregate and waste material supplied to the dryer 1. It is equipped with an aggregate measuring conveyor 9 for detecting the amount of supplied material, and a waste material measuring conveyor 18 for detecting the amount of waste material supplied, and the material instantaneous flow rate detected by the aggregate measuring conveyor 9 and the waste material measuring conveyor 18 is preliminarily determined. A comparison unit 14 that calculates a deviation by comparing it with the set amount set in the material supply ratio setting unit 25, and a calculation unit 26 that calculates a correction amount for cutting out waste material based on the deviation amount output from the comparison unit 14. , means for correcting the amount of waste material to be cut out from the waste material hopper 15 based on the correction amount of waste material to be cut out from the calculation section.

(e) Effect The present invention detects the amount of new aggregate supplied to the dryer 1 by the aggregate measuring conveyor 9, detects the amount of waste material supplied by the waste material measuring conveyor 18, and determines the material supply ratio in advance. A comparison unit 14 compares the supply ratio of new aggregate and waste material set in the setting unit 25 with the supply amount to calculate a deviation amount, and a calculation unit 26 calculates a correction amount for cutting out waste material based on the deviation amount. Then, the waste material hopper 1 is set based on the cutting correction amount.
Adjust the amount of waste material cut out from step 5.

(F) Embodiment FIG. 1 shows an embodiment of the present invention, in which 1 is a dryer for heating new aggregate and waste material, and is a cylindrical body with a large number of raking blades 2 arranged around the inside. is tilted and rotatably supported on a machine stand 3, and is rotated at a predetermined speed while blowing hot air through a burner 4 installed at one end to heat the material rolling down inside the dryer.

5a, 5b, and 5c are aggregate hoppers for storing new aggregate according to various particle sizes, and below the hoppers are variable speed feeders 6a, 6 for cutting out new aggregate.
b, 6c are provided, and feeders 6a, 6b,
Each motor transmission device 7 outputs a speed command to 6c.
a, 7b, and 7c are controlled to cut out a predetermined amount of new aggregate, convey it on a belt conveyor 8, and supply it into the dryer 1 via an aggregate measuring conveyor 9. The aggregate weighing conveyor 9 is provided with a load cell 10, which is a vertical load detector for detecting the weight of conveyed aggregate, and a belt speed detector 11.
The speed pulse signal output from the load cell 10 is inputted to the frequency/voltage converter 12, converted to voltage, and the output speed voltage signal is applied as the voltage of the load cell 10, thereby outputting the aggregate instantaneous flow rate from the load cell 10. Take out the signal and send this output signal to amplifier 1
3 to the comparison unit 14.

Reference numeral 15 denotes a waste material hopper for storing waste materials, and controls a motor transmission device 17 that outputs a speed command to a variable speed feeder 16 for cutting out waste materials provided below the hopper, cuts out a predetermined amount of waste materials, and transfers the waste materials to a waste material weighing conveyor. Waste material input chute 19 via 18
The aggregate is put into the dryer 1, mixed with heated new aggregate, heated, and discharged from the discharge port 20. Similar to the aggregate weighing conveyor 9, the waste material weighing conveyor 18 is provided with a load cell 21, which is a vertical load detector for detecting the weight of conveyed waste material, and a belt speed detector 22, and the belt speed detector 22 outputs an output. After the speed pulse signal is converted into a speed voltage signal by the frequency/voltage converter 23, an output signal of the instantaneous flow rate of the waste material is extracted from the load cell 21 by applying it as a voltage to the load cell 21, and this output signal is sent via the amplifier 24. Input to the comparison section 14.

In the comparison section 14, the material supply ratio setting section 25
The amount of deviation is calculated by comparing the waste material/new aggregate supply ratio inputted by the load cell 10 with the ratio of the new aggregate supply amount detected by the load cell 10 and the waste material supply amount detected by the load cell 21. The amount of voltage to be input to the calculation unit 26 and applied to the motor transmission device 17 in order to correct this deviation amount is calculated, and this correction voltage signal is applied to the motor transmission device 17 to correct the amount of waste material cut out by the feeder 16. This ensures that the material supply ratio to the dryer 1 is always the set amount.

(G) Effect The present invention allows the new aggregate and waste material supplied to the dryer 1 to be transferred to the aggregate weighing conveyor 9 and the waste material weighing conveyor 18.
The method detects the instantaneous flow rate, compares it with a preset material supply ratio, calculates the amount of deviation, and corrects the amount of cut out of the waste material hopper 15 based on this amount of deviation. The supply ratio of wood and waste material can be precisely controlled, and the asphalt mixture produced by this method has the practical benefit of maintaining uniform quality.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention. 1... Dryer, 5a, 5b, 5c... Aggregate hopper, 6a, 6b, 6c... Feeder, 8... Belt conveyor, 9... Aggregate measuring conveyor, 10, 21...
Load cell, 11, 22...Belt speed detector, 1
4... Comparison section, 15... Waste material hopper, 16... Feeder, 17... Motor transmission device, 18... Waste material measuring conveyor, 19... Waste material input chute, 25... Material supply ratio setting section, 26... Calculation section.

Claims (1)

[Claims] 1. In a device that manufactures asphalt mixture by supplying new aggregate and waste material into a dryer and heating and mixing them, an aggregate measuring conveyor is used to detect the amount of new aggregate supplied, and an aggregate measuring conveyor is used to detect the amount of waste material supplied. a comparison section that is equipped with a waste material measuring conveyor, and calculates a deviation amount by comparing the instantaneous material flow rate detected by the aggregate measuring conveyor and the waste material measuring conveyor with a set amount set in advance in the material supply ratio setting section. a calculation unit that calculates a correction amount of cutting out of waste material based on the deviation amount output from the comparison unit; and a calculation unit that corrects the amount of cutting out of waste material from the waste material hopper based on the correction amount of cutting out of waste material output from the calculation unit. A material supply device for an asphalt mixture manufacturing device, characterized in that it is equipped with a means for.