JPH052045B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a road surface regeneration device used in the Remix method, which is one of the asphalt pavement repair methods, and particularly relates to a heating device for heating scraped recycled material. Regarding the installed road surface regeneration device.

[Prior Art] Conventionally, as a road surface regeneration device used in the Remix construction method, one is known that simply mixes recycled material scraped up with a scarifier with high-temperature new material and spreads it out.

[Problems to be solved by the invention] However, since the conventional equipment simply mixes recycled material with high-temperature new material, it is not always possible to control the temperature of the recycled mixture at a constant level, and it is not possible to maintain a high and stable temperature. There was a problem that it was difficult to perform surface regeneration of quality.

[Means for Solving the Problems] The present invention was provided in order to solve the above-mentioned problems. Equipped with a heating device that raises the temperature of the material to a specified temperature, the recycled material heated to the specified temperature by this heating device is mixed with new material supplied separately and spread on the road. The road surface regeneration device includes, as the heating device, a cylindrical drum whose axis is slightly inclined from horizontal, a rotation mechanism that rotates the drum around the axis, and a hot air supply mechanism that supplies hot air into the drum. The rotary drum heater is provided with a rotary drum heater, and is characterized in that the rotary drum heater is mounted on a horizontal holding frame that is swingably provided on the traveling vehicle and is always held horizontally.

[Function] In the present invention, the material scraped up by the scarifier is put into a rotating drum heater and heated therein to a specified temperature. In this case, the recycled material placed inside the drum is lifted up to the top of the drum as the inner wall of the drum rotates, and then freely falls from above.

As this operation is repeated, the recycled material is heated to a specified temperature by the hot air supplied into the drum. In addition, because the drum is slightly inclined from horizontal, as it repeatedly falls freely, the falling point of the recycled material gradually moves to the lower side of the drum's inner wall, which is sloping, and the recycled material gradually falls inside the drum. It will proceed and be discharged from the outlet.

The recycled material, which has been heated to a specified temperature and discharged from the drum, is stored in a recycled material surge bin, mixed with new material supplied separately, and spread on the road surface.

[Example] Hereinafter, an example of the road surface regeneration device of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, A is a running vehicle.
The traveling vehicle A is elongated in the front-rear direction, has a total of four wheels 1 on the front, rear, left and right sides, and has two engines 2 mounted in the front as drive sources for a traveling device and various work devices. Additionally, the traveling vehicle A is able to freely travel and transport work, and at the very front there is a hopper 1 that receives new asphalt mixture (new material) from a dump truck running in front.
0 is provided. This hopper 10 is arranged at a low position, and a push roller 1 for pushing a dump truck is provided at the front end of the hopper 10.
1 is attached.

Furthermore, a V-first feeder 12 is arranged at the center of the front of the traveling vehicle A, extending rearward from the hopper 10 and for carrying the material in the hopper 10 rearward. This V-first feeder 12 is raised from the hopper 10 located at a low position to the height of the driver's seat 3, and its rear end is located between the left and right driver's seats 3.

Behind this V-1 feeder 12, a V-2 feeder 13 to which V-1 feeder 12 transfers is separately arranged. The V second feeder 13 is
It extends from a position below the rear end of the first feeder 12 to the rear end of the traveling vehicle A, and the V-first feeder 1
The new material received from 2 can be transported to a new material surge bin 14 located at the rear end of the traveling vehicle A. This V second feeder 13 is installed almost horizontally above the traveling vehicle A,
At the bottom, various main equipment, which will be described later, is arranged. In addition, the above-mentioned V first feeder 12 and V second feeder
As the feeder 13, a bar feeder is used.

By the way, as mentioned above, the new material receiving hopper 10 and the push roller 11 are provided at a low position in the front part of the traveling vehicle A. Therefore, if this situation continues, when the device of the present invention is placed on a trailer,
These things get in the way. Therefore, in this device, the hopper 10, the push roller 11, and the V-first feeder 12 are mounted integrally on one frame 15, and the frame 15 is set at a fulcrum P1 near the rear end of the V-first feeder 12. The center can be lifted up and retracted using a hydraulic cylinder 16.

In addition, at the bottom of the traveling vehicle A, the front wheels 1
Rotary scarifiers 20 and 21 are arranged parallel to each other at the rear to scrape up the pavement of the road. The rotary carificer 20 on the front side is configured to be movable left and right depending on the road width, and the rotary carificer 21 on the rear side is fixedly provided at that position. These allow the necessary width of the road to be maximized.

These rotary california ears 20, 21 are
Two road heaters running in front of this road surface regeneration device can scrape up the heated road surface, and the front and rear scarifiers 20 and 21 are set to rotate in opposite directions as shown by the arrows. has been done. This is to cancel out the reaction forces received when scraping up the road surface.

In addition, the rotary californiaers 20 and 21 are
It has screw-like blades on the outer periphery,
The twist direction of the blades is set opposite on the left and right sides,
Moving vehicle A collects material scraped up by rotating.
The structure is such that it is concentrated in the center of the area. Also, of course, rotary california 2
0 and 21 can be adjusted in the vertical direction by hydraulic cylinders (not shown), so that the scraping depth can be adjusted.

Rotary californiaer 20 with such a configuration
A laser sensor (scraping amount measurement device) is installed in front of the road surface to measure the shape of the road surface in the transverse direction.
22 are provided. This laser sensor 22
is provided to measure the amount of scraping by the rotary califliers 20 and 21,
The measured value signal is input to an arithmetic unit built into the control device. Then, the calculation device calculates the scraping volume from the value measured by the laser sensor 22, the scraping depth and scraping width, and the running speed of this device, and converts it into the corresponding weight. ing.

Further, behind the rotary carifiers 20 and 21, there is a rotating drum heater (heating device) 50 that heats the material scraped by the rotary carifiers 20 and 21 (hereinafter referred to as recycled material) to a specified temperature.
is arranged, and further behind it is a drum heater 5.
Recycled material surge bin 2 that stores recycled materials heated at 0
3 is placed. Then, between the rotary carificer 20, 21 and the rotary drum heater 50, the recycled material scraped up by the rotary carificer 20, 21 is taken up and placed between the rotary drum heater 5.
An R first feeder 24 is provided between the outlet of the rotary drum heater 50 and the recycled material surge bin 23 to convey the recycled material heated by the drum heater 50 to the recycled material surge bin 23. A second feeder 25 is provided.

As shown in FIGS. 3 and 4, the rotating drum heater 50 includes a cylindrical rotating drum 51, a rotating mechanism 52 that rotates the rotating drum 51, and combustion chambers 53 provided on the left and right sides of the rotating drum 51.
and a burner (hot air supply mechanism) 54 provided in each combustion chamber 53, and the hot air generated in the combustion chamber 53 is transferred to the inlet 51A of the rotating drum 51.
It is composed of an air guide path 55 that leads to.

In this case, the rotating drum 51 is arranged on the center line of the traveling vehicle A, with its axis oriented in the front-rear direction, and furthermore, the axis is inclined slightly downward from the horizontal toward the rear. Further, as shown in FIG. 5, a plurality of scraping blades 51B are provided on the inner circumferential wall of the rotating drum 51 and are arranged at equal intervals in the circumferential direction. It is now possible to scrape up.

Further, as shown in FIGS. 3 to 5, the rotation mechanism 52 includes four rotation support rollers 52A on the front, rear, left, and right sides that rotatably support the drum 51, and the rotation support rollers 52A that rotate the drum 51, which is inclined, so that it does not shift according to the inclination. , a driving hydraulic motor (not shown), a sprocket 52C provided on the output shaft of the hydraulic motor, and a rotating drum 51.
A sprocket 52D is formed on the outer periphery of the drive chain 52D, and a drive chain 52E is wound around the sprocket 52D.

Further, the left and right combustion chambers 53 and the air guide passage 55 are integrally constructed, and the whole has a U-shape when viewed from above, and the air guide passage 55 is communicated with the inlet 51A in front of the drum 51. It is located.

The rotary drum heater 50 rotates the drum 51 and introduces the recycled material from the inlet 51A, thereby gradually transporting the contents backward using the inclination, and lifting the recycled material by the hot air flowing inside. It is designed to keep you warm.

Here, the rotary drum 51 is formed to have a large diameter near the exit on the rear side, so that a large amount of material can be stored in this part, and a large amount of material can be dropped onto the R second feeder 25 and transported efficiently. It is configured. In addition, what is indicated by the reference numeral 56 is the drum 5.
This is an exhaust pipe provided at the exit of the rotary drum 51, and the exhaust gas inside the rotary drum 51 can be discharged to the outside by a built-in axial flow fan.

The rotating drum heater 50 having such a structure is fixed on a horizontal holding frame 40 that is provided independently of the traveling vehicle A. The horizontal holding frame 40 is for holding the inclination angle of the rotary drum heater 50 at a constant posture regardless of the inclination state of the traveling vehicle A, and is controlled so as to maintain it horizontally.
Therefore, as shown in FIG.
2, it is swingably supported. A tilt sensor 41 is provided at the rear, and the tilt sensor 4
By automatically controlling the hydraulic cylinder 42 according to the detection data of 1, the horizontal holding frame 40
is kept horizontal.

Further, the two surge bins 14 and 23 for new material and recycled material described above are both arranged side by side and provided at a relatively high position. Further, as shown in FIG. 3, gates 14B and 23B are provided at the lower part thereof, respectively, which are opened and closed by hydraulic cylinders 14A and 23A. Incidentally, capacitive level sensors 14C and 23C are inserted into the surge bins 14 and 23, respectively.

At the lower position of these surge bins 14, 23,
A pug mill mixer 60 is arranged to mix the materials supplied from the surge bins 14 and 23. This pug mill mixer 60 also serves as a measuring device, and is suspended and supported from the horizontal holding frame 40 via a load cell 61. The weight of the contents in the pug mill mixer 60 can be measured using a load cell 61. Moreover, an additive supply pipe 62 for injecting additives into the pug mill mixer 60 is provided above the pug mill mixer 60. A compounding device 65 is configured by the gates 14A and 23B of the surge bins 14 and 23, the pug mill mixer 60, the load cell 61, and the additive supply pipe 62.
Inside the machine, new materials, recycled materials, and additives can be mixed and kneaded in a predetermined ratio.

A gate 64 that is opened and closed by a hydraulic cylinder 63 is provided on the bottom of the pug mill mixer 60. This gate 64 opens toward the rear side of the traveling vehicle A, and by opening this gate 64, the regenerated mixture manufactured by completing the mixing can be supplied to the road surface. Further, behind the gate 64, a spreading screw 4 is arranged to spread the recycled mixture laterally, and further behind the spreading screw 4, the recycled mixture spread by the spreading screw 4 is spread and compacted. A screed (leveling device) 5 is arranged.

Incidentally, the screed 5 is supported by a leveling arm 6 shown in FIG. 2 that is swingably provided with respect to the traveling vehicle body A, so that the thickness of the pavement can be adjusted.

Furthermore, as described above, the horizontal holding frame 40 is equipped with a rotary drum heater 50 and a pug mill mixer 60 that also serves as a metering mechanism, which must be maintained in a constant state regardless of the inclination state of the traveling vehicle A. However, in addition to the above, both surge bins 14 and 23, and a V second feeder 13 and an R second feeder 25 for carrying materials to the surge bins 14 and 23 are placed. These parts are swung together and held in a substantially constant position.

Further, a control device (not shown) is incorporated in this on-road surface regeneration device. The main role of this control device is as follows. Setting and controlling the traveling speed, rotary californiaer 2
The amount of scraping by 0,21 is detected by the laser sensor 22.
, control the combustion and temperature of the burner 54 of the rotary drum heater 50 , control the inclination of the horizontal holding frame 40 that supports the rotary drum heater 50 , It controls the opening and closing of the gates 14B and 23B and the additive supply valve (not shown) and the opening and closing of the gate 64 of the pug mill mixer 60, and also takes in the measurement signal of the load cell 61 and controls the metering (composition) of new materials and recycled materials. control of additives, etc.

Among these, the control device is configured so that the measurement result of the amount of scraping is particularly reflected in the content of the measurement (formulation). The reason for this is that if the amount of recycled material increases or decreases rapidly, the blending ratio with new material will change suddenly, which is undesirable as it will impair quality stability. Therefore, in order to avoid sudden changes, the ratio of new material to recycled material is controlled to be changed in stages. In this case, there is a time delay before the reclaimed material scraped up by the rotary carificers 20 and 21 reaches the surge bin 23 as it passes through the middle.
Using this time delay, depending on the amount of recycled material,
Control is now performed to gradually and automatically change the blending ratio within a limited range.

For example, the mixing ratio of recycled material and new material is 6:4.
It is assumed that if the amount of scraping suddenly decreases when the amount of scraping is being carried out, the decreasing tendency will occur in the surge bin 23 after a time delay of 5 minutes.
In such a case, the rotary californiaer 20,2
From the point at which the amount of scraping caused by No. 1 decreases, the blending ratio is gradually and automatically changed, such as 5.5:4.5 for the next batch, 5:5 for the next batch, and so on. By doing so, it is possible to alleviate sudden changes in the blending ratio within the pug mill mixer 60, and it is possible to obtain a regenerated mixture that does not undergo sudden changes in quality as a whole.

In addition, the measurement result of the amount of scraping is
It has come to be used in connection with the control of For example, control is performed such that when the amount of scraping increases, the thermal power of the burner 54 is increased, and when the amount of scraping decreases, the thermal power of the burner 54 is decreased.

The main control contents other than those mentioned above will be explained in the explanation of the operation.

Next, the operation of the road surface regeneration device configured as described above will be explained.

When actually performing road surface regeneration work, two road heaters run in front of this device to heat the road surface. In addition, a compaction roller runs behind this device, compacting the road surface.

While moving forward at a working speed, this device scrapes up the pre-heated pavement of the road surface using the rotary scarifiers 20 and 21. The scraped up material is fed into the drum heater 50 from the inlet of the rotary drum heater 50 by the R first feeder 24 as recycled material.

Next, the recycled material put into the inside of the drum 51 is scraped up by the scraping blades 51 as the drum 51 rotates.
It is scraped up by B and reaches near the top of the drum 51, and then falls freely from above. As this operation is repeated, the temperature of the recycled material is efficiently and evenly raised by the hot air supplied into the drum 51. Further, since the drum 51 is inclined by a predetermined angle, as the free fall is repeated, the falling point of the recycled material gradually moves to the rear side of the traveling vehicle, and the recycled material is moved backward in the drum 51 and R Second
It falls onto feeder 25. The recycled material is then transported to the surge bin 23 by the R second feeder 25, where it is temporarily stored.

On the other hand, the new material is received by the hopper 10 from the dump truck running in front, carried to the rear by the V-first feeder 12, transferred to the V-second feeder 13 on the way, and finally sent to the new material surge bin 14. Can be stored.

The materials stored in these surge bins 14 and 23 are thrown into the pug mill mixer 60 by opening the lower gates 14B and 23B.
In this case, first, the gate 64 of the pug mill mixer 60
When the container is closed and empty, recycled material is added. That is, the gate 23B of the surge bin 23 is opened according to an instruction from the control device, and the recycled material is supplied into the pug mill mixer 60. On the other hand, load cell 6
1 detects the weight, and when the detected value reaches a preset value, closes the gate 23B. This completes the measurement of one batch of recycled material.

At almost the same time as the above measurement, the additive is separately measured using a measuring device (not shown). Then, following metering of the recycled material, the additive supply valve is opened and the additive is added. Finally, new material surge bin 14
By controlling the opening and closing of the gate 14B, new material is measured and supplied into the pug mill mixer 60 in the same manner as the recycled material.

In this way, each material is sequentially measured in batches and simultaneously mixed by the pug mill mixer 60 for a predetermined period of time. When mixing for a predetermined period of time is completed, the gate 64 at the bottom of the pug mill mixer 60 is opened, and the regenerated mixture is supplied to the spreading screw 4. The regenerated mixture is then spread on the road surface, leveled with a screed 5, and compacted with subsequent compaction rollers. The road surface layer regeneration work is performed continuously through the above steps.

During this work, as the amount of scraping increases or decreases, the mixing ratio is automatically changed for each batch within a limited range in the manner described above, and paving is achieved without sudden changes in quality. In addition, the rotating drum heater 5
The pug mill mixer 60 for weighing and weighing is always maintained in a constant posture even if the traveling vehicle A approaches the slope surface, so it exhibits stable performance.

Furthermore, when loading the device onto the trailer after the work is completed, it is possible to easily load the device without any trouble by lifting the hopper 10, etc., as shown by the two-dot chain line in Figure 2. can.

Further, according to the above-described construction method, the pre-heated road surface is scraped up and the material is heated by the rotating drum heater 50, which has the effect of preventing the generation of so-called blue smoke.

In the above embodiment, a road heater is run in front of this device to preheat the road surface and then scrape it up. However, the rotary scarifier 20, It is also possible to proceed with the work by scraping it up with 21.

Further, in the above embodiment, the exhaust pipe 56 of the rotary drum heater 50 is directed upward to release the exhaust gas into the upper space.
It may also be sprayed onto the road surface after raking has been completed. This makes it possible to prevent a drop in temperature on the scraped surface and to soften the fine powder on the scraped surface, thereby improving the adhesion to the recycled mixing section to be laid next.

Furthermore, in the above embodiment, a road heater is run in front of this device to heat the road surface in advance and then scrape it up. However, the rotary scarifier 20, It is also possible to proceed with the work by scraping it up with 21. In that case, there is a risk of blue smoke occurring during heating, so to prevent this, preheating is performed at the R first feeder 24,
It is desirable that the heating temperature be raised in two stages.

[Effects of the Invention] As explained above, according to the present invention, the recycled material is heated by a rotating drum heater equipped so that it can always exhibit a predetermined ability in a constant posture. The temperature can be raised uniformly,
The temperature of the reclaimed mixture mixed with the new material can be controlled at a constant level. Therefore, the road surface layer can be regenerated with high quality.

[Brief explanation of drawings]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a side view showing the main parts of the embodiment, Fig. 4 is a plan view of the same, and Fig. 5 is the third
It is a sectional view taken along the - arrow in the figure. A... Running vehicle, 4... Spreading screw, 5... Screed, 20, 21... Rotary califier, 23... Recycled material surge bin, 24... R 1st feeder, 25... R th 2 feeder, 40... Horizontal holding frame, 41... Inclination sensor, 42... Hydraulic cylinder, 50... Rotating drum heater (heating device), 51... Rotating drum,
51B... Raking blade, 52... Rotating mechanism, 5
3... Combustion chamber, 54... Burner, 55...
Air guide path.

Claims (1)

[Claims] 1 A running vehicle is equipped with a scarifier that scrapes the road surface and a heating device that raises the temperature of the recycled material scraped up by the scarifier to a specified temperature. The road surface regeneration device mixes recycled materials with new materials supplied separately and spreads the mixture on the road, and the heating device includes a cylindrical drum whose axis is slightly inclined from horizontal; A rotating drum heater is provided, which includes a rotation mechanism that rotates the drum around its axis, and a hot air supply mechanism that supplies hot air into the drum. A road surface regeneration device equipped with a recycled material heating device, characterized in that it is installed on a horizontal holding frame that is always held horizontally.