JPH044012Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] This invention relates to a recycled aggregate production plant that recycles pavement waste material generated during repair and repair work of asphalt-paved roads into aggregate. [Prior Art] The technology of using asphalt pavement waste material as recycled material for the purpose of effective resource use and resource saving is well known. FIG. 3 shows a flow sheet of the reuse technology system. As shown in this flow sheet, when reusing asphalt pavement waste, firstly, asphalt pavement waste generated on site (commonly called block waste) is transported to a stockyard with a recycling plant, and then it is reused in a fixed grizzly to form roadbed material and asphalt. Separate into mixtures. The separated roadbed material will be returned to the site and reused as so-called recycled roadbed material. As shown in the flow sheet in Figure 3, the remaining asphalt mixture is crushed using a crushing device such as an impact crusher, and then passed through a classifying device such as a vibrating sieve to classify it by particle size, e.g., fine bones. It is classified into wood and coarse aggregate and used as recycled aggregate. The recycled aggregate is heated and blended with new aggregate, asphalt, recycling additives, etc., as shown by the dotted line in FIG. 3, and reused as recycled asphalt mixture. [Problems to be solved by the invention] However, when asphalt pavement waste is recycled into recycled aggregate and used to produce recycled asphalt mixture, the following problems arise. First, pavement waste recycled as aggregate contains old asphalt, so during the process of recycling it as aggregate, if there is a large amount of asphalt contained, it will stick to the crusher of the crusher or the screen of the classifier. However, it also solidifies in the stock, impeding the efficiency of the recycling process. Particularly, asphalt pavement waste generated in cold regions has a relatively high asphalt content due to climatic conditions, which becomes the above-mentioned inhibiting factor. By the way, the asphalt content of recycled aggregate made from asphalt pavement waste generated in a cold region is 6% per weight on average, and the penetration is 40 to 60.
(1/100mm), which is extremely asphalt-rich. Therefore, when asphalt-rich pavement waste is recycled as aggregate, the asphalt content tends to stick to the screens of crushing equipment and classification equipment, which is a problem that hinders the efficiency of the recycling process. It's summery. Furthermore, when recycled aggregates with a high asphalt content are stored in silos or the like or in piles, they tend to solidify, causing inconvenience in handling. In any case, when reclaiming and using asphalt pavement waste, it is ensured that it has the same quality as when working with new materials and, in particular, that it has economic benefits. From this point of view, this idea was developed by adding an appropriate amount of sand to the waste material to be recycled during the manufacturing stage of recycled aggregates, thereby suppressing adhesion to the plant equipment and solidification of the material itself. The object of the present invention is to provide a recycled aggregate manufacturing plant configured to automatically control and supply the amount of sand added, and capable of suppressing adhesion in the manufacturing process and solidification during stocking. . [Means for Solving the Problems] As a means to achieve the above object, the present invention is a recycling method in which asphalt pavement waste is crushed using a crushing device, and then classified according to particle size using a classifier to produce recycled aggregate. In the aggregate production plant, in addition to the transport means for supplying asphalt pavement waste to the crushing device, a sand supply device consisting of a sand feeder for supplying sand was connected. Then, the carrying-out means for receiving the material to be recycled which is crushed and discharged from the crushing device is equipped with a scale conveyor equipped with a weight detection device. The weight detection device of this scale conveyor was connected to a controller that could set in advance the appropriate supply amount of sand to be added according to the content of asphalt contained per unit weight of the material to be recycled. Then, this controller is connected to the drive motor of the sand supply device, and the drive motor of the sand supply device is controlled via the controller based on the output signal of the weight detection device. be. In other words, the old asphalt contained in the material to be recycled that comes out of the crusher after being crushed is transported to the site where the asphalt pavement waste is shipped, for example, pavement in a warm region or pavement in a cold region. Furthermore, it is empirically known that the average amount is 6.0% (weight ratio), although there are slight differences depending on the state of deterioration. Therefore, the appropriate amount of sand to be supplied is set in the controller in advance based on the asphalt content per unit weight of the recycled material, and the drive motor of the sand supply device is controlled via this controller. As a result, the structure is such that the amount of sand added can be controlled. [Operation] Since this invention is configured as described above, an appropriate amount of sand is supplied to the crushing device according to the weight of the material to be recycled that comes out after being crushed by the crushing device. As a result, the asphalt content contained in the material to be recycled is adjusted to be relatively lower, and the material to be recycled is prevented from adhering to the crushing equipment during the recycling process, and furthermore from solidifying during storage after recycling. I can do it. [Example] Fig. 1 shows a process flow diagram of a recycled aggregate manufacturing plant according to the present invention, and Fig. 2 shows a process flow diagram of a recycled aggregate manufacturing plant according to the present invention, and Fig. 2 shows a process flow diagram of a recycled aggregate manufacturing plant according to the present invention. This figure shows a connection between a sand supply device consisting of a sand feeder that supplies sand to a crushing device, and a belt conveyor that receives recycled material processed by the crushing device. That is, both FIG. 1 and FIG. 2 show the main parts of the present invention. First, the crushing device 1 includes a general impact crusher. 2 is a sand supply device consisting of a sand feeder for supplying sand to this crushing device 1. In this figure, the sand supply device 2 is shown as having a belt conveyor, but it may also be constructed as having a screw feeder. Next, as a means for carrying out the material to be recycled which has been processed by the crushing device 1, a scale conveyor 3 equipped with a weight detection device is used as shown in FIG. Specifically, a scale conveyor 3 equipped with a load cell 4 was used. Next, a controller 6 was connected to the load cell 4 of the scale conveyor 3, which can set the appropriate amount of sand to be added according to the content of asphalt contained per unit weight of the material to be recycled. This controller 6 was connected to a drive motor 5 of a sand supply device 2 consisting of a sand feeder. In addition, in this embodiment, the controller is configured such that the average weight ratio of old asphalt to the weight of the material to be recycled is
Since the content was 6.0%, adjustments were made so that sand could be supplied within a range of 15 to 25% by weight depending on this content. Based on the output signal from the load cell 4, the rotation speed of the drive motor 5 in the sand feeder, which is the sand supply device 2, is controlled via the controller 6, thereby controlling the amount of sand supplied to the crushing device 1. It was configured as follows. Therefore, in the recycled aggregate manufacturing plant according to the present invention, the flow sheet of FIG. 1 and the flow sheet of FIG.
Due to the operation of the sand supply device shown in the figure, the material to be recycled and sand are simultaneously supplied to the crushing device. As a result, the recycled material is mixed with the sand during the crushing process. That is, particles of pavement waste material containing crushed asphalt are mixed with sand, and the sticky state becomes smooth. Therefore, during the process of passing through the classification device and being separated by particle size, the pavement waste does not adhere to the screens of the crushing device or classification device and cause trouble during the manufacturing process. In particular, since the supply amount of sand is regulated to 15 to 25% by weight according to the old asphalt content as described above, it is especially difficult to use when used as recycled asphalt mixture. There will be no inconvenience. Of course, the amount of sand supplied is determined by the asphalt content contained in the asphalt pavement waste material to be recycled, and is not uniform. Table 1 shows recycled aggregate obtained by separating block waste (including roadbed material before being separated by Grizzly) containing an average of 5.7% asphalt by Grizzly, and then simply processing the remaining asphalt pavement waste by running it in a recycled aggregate plant. This shows the composition of the modified recycled aggregate obtained by adding sand using the method according to the present invention.

[Effect of idea]

As described above, the recycled aggregate manufacturing plant according to the present invention, in the crushing stage of the manufacturing process,
Since it is configured to automatically supply sand at a preset ratio, the asphalt content is transferred to plant equipment, plant equipment, etc. during the manufacturing process.
For example, there is no need to worry about it adhering to the crusher of a crushing device, the screen of a classifying device, or even to conveying devices such as conveyors that connect these devices and causing problems in production. Of course, even if recycled aggregates are stored in piles in storage tanks or yards after being produced, they will not solidify and impede work efficiency. In other words, the workability and efficiency of the recycling process can be maintained at a high level, the maintenance and management of the recycled aggregate plant can be facilitated, and furthermore, the effect of improving the storage properties of the obtained recycled aggregate can be exhibited. Therefore, the so-called recycled asphalt mix, which uses recycled aggregate prepared by adding this sand, is extremely superior in quality, homogeneous, and There is no operational trouble and it is highly economical. As a result, the utility as a recycled aggregate manufacturing plant for the purpose of resource saving can be greatly enhanced.

[Brief explanation of the drawing]

Fig. 1 of the embodiment is a process flow diagram of a recycled aggregate manufacturing plant according to the present invention, Fig. 2 shows the main parts of the present invention, and is a mechanical diagram showing the sand supply device and connection part to the crushing device. The figure is a flow diagram of the recycling system for asphalt pavement waste. DESCRIPTION OF SYMBOLS 1... Crushing device, 2... Sand feeder (sand feeder), 3... Scale conveyor, 4... Load cell, 5... Belt conveyor drive motor, 6...
...controller, 7...belt conveyor.

Claims (1)

[Scope of utility model registration request] In a recycled aggregate manufacturing plant where asphalt pavement waste is crushed by a crushing device and then classified by particle size by a classifier to produce recycled aggregate, a sand supply device is connected to the crushing device, and a sand supply device is connected to the crushing device. The carrying-out means for receiving the material to be recycled that comes out after the crushing process is configured with a scale conveyor equipped with a weight detection device, and the weight detection device of this scale conveyor measures the amount per unit weight of the material to be recycled in advance. Connected to a controller that can set an appropriate supply amount of sand to be added according to the content of asphalt contained, the controller is connected to a drive motor of the sand supply device,
A recycled aggregate manufacturing plant characterized in that the drive motor of the sand supply device is controlled via a controller based on the output signal of the weight detection device, and the amount of sand added by the sand supply device is controlled. .