JPH0518965B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] 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 is particularly capable of measuring the amount of regenerated mixture immediately before a screed. The present invention relates to a road surface regeneration device equipped on an automatic regeneration mixture supply device as described above.

[Prior Art] Conventionally, road surface regeneration devices used in the LIMITX construction method include a scuff tire that scrapes the road surface on a traveling vehicle, and a new material that is separately supplied with recycled material loosened by the scuff tire. A known device is equipped with a mixing device for mixing, a spreading screw that spreads the recycled mixture mixed by the mixing device onto the road surface, and a screed placed behind the spreading screw. ing.

[Problems to be Solved by the Invention] However, in the conventional device, when the mixing device for the regenerated mixture is a batch type, the spreading screw in the subsequent stage continuously spreads the regenerated mixture. There is a problem in that the amount of collected recycled mixture tends to increase or decrease significantly in front of the screed, and it is difficult to maintain the amount of collected material at an appropriate level.

[Means for Solving the Problems] The present invention has been provided to solve the above-mentioned problems, and is characterized by providing a sensor for measuring the amount of recycled mixture accumulated immediately before the screed.

[Function] In the present invention, the amount of collected recycled mixture immediately before the screed is measured by the sensor. This data can therefore be used to control the speed of the spreading screw and the amount of mixing in the mixing device.

[Example] Hereinafter, an example of a road surface regeneration device equipped with an automatic supply device for a regeneration mixture 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 and back 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 portion as drive sources for a traveling device and various work devices. The traveling vehicle A is capable of freely traveling and transporting work, and is equipped with a hopper 10 at its front end to receive new asphalt mixture (new material) from a dump truck running in front. This hopper 10 is arranged at a low position, and a push roller 11 for pushing a tamp track is attached to the front end of the hopper 10.

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 left as is, these will become a hindrance when the device of the present invention is placed on a trailer for moving from the construction site to another location. Therefore, in this device, in order to raise the overhang portion upward, the hopper 10, push roller 11, and V-first feeder 12 are integrally mounted on one frame 15, and this frame 15 is attached to the V-first feeder 12. It can be lifted upward and retracted using a hydraulic cylinder 16 around a fulcrum P1 near the rear end.

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 to loosen the pavement on the road surface at the rear side. The front rotary carificer 20 is configured to be able to freely move left and right depending on the road width, and is fixedly provided at that position of the rear rotary carificer 21. These allow the necessary width of the road to be made as wide as possible.

These rotary california ears 20, 21 are
Two road heaters running in front of this road surface regeneration device can scrape 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 because the reaction forces received when scraping the road surface cancel each other out.

In addition, the rotary carificer 20, 21 has screw-like blades on the outer periphery, and the direction of twist of the blades is set opposite on the left and right sides, so that the material loosened by rotation is scattered and the moving vehicle A It is structured so that it is concentrated in the center. Also, of course, rotary california 2
0 and 21 are vertically adjustable by hydraulic cylinders (not shown), so that the depth of road surface scraping can be adjusted.

The rotary carificer 20 with such a configuration
A laser sensor (scratching 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 loosening by the rotary califliers 20 and 21,
The measured value signal is input to an arithmetic unit built into the control device. Then, the arithmetic device calculates the loosening volume from the value measured by the laser sensor 22, the loosening depth and width, and the running speed of this device, and converts it into the corresponding weight. There is.

Further, behind the rotary carificer 20, 21, there is a rotating drum heater (heating device) 50 that heats the material scraped by the rotary carificer 20, 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 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 rotating drum 51, a rotating mechanism 52 that rotates it, combustion chambers 53 provided on the left and right sides of the rotating drum 51, and a combustion chamber 53 provided in each combustion chamber 53. It is composed of a burner 54 provided and an air guide path 55 that guides hot air generated in the combustion chamber 53 to the inlet of the rotating drum 51, and the axis is set on the center line of the traveling vehicle body A in the longitudinal direction. It is arranged so that the axis line is inclined slightly downward from the horizontal as it goes towards the rear. The drum 51 is rotated to gradually transport the contents backward using the inclination, and the temperature of the recycled material is raised by the hot air flowing inside.

Here, the rotary drum 51 is formed to have a large diameter near the exit on the rear side, and a large amount of material is stored in this part by scraping blades (not shown), and a large amount of material is dropped onto the R second feeder 25. It is constructed so that it can be transported efficiently. In addition,
Reference numeral 56 denotes an exhaust pipe provided at the outlet of the drum 51, which allows exhaust gas in the rotating drum 51 to 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 body A. The horizontal holding frame 40 is for keeping the inclination angle of the rotary drum heater 50 constant regardless of the inclination state of the traveling vehicle A, and is controlled to keep it absolutely horizontal. Therefore, as shown in FIG.
It is supported so that it can swing freely. A tilt sensor 41 is provided at the rear, and the tilt sensor 41
The horizontal holding frame 40 is adapted to be kept horizontal, which is suitable for automatically controlling the hydraulic cylinder 42 according to detected data.

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 Survivin bins 14 and 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 consists of a mixing container 60A that also serves as a measuring container, a pair of stirring blades 60B, and a drive device (not shown) that drives the stirring blades 60B.
It is suspended and supported in a well-balanced manner from the horizontal holding frame (support frame) 40 via a plurality of load cells 61. Then, the weight of the contents in the mixing container 60A of the Pakumil mixer 60 is measured by the load cell 60.
1. In this case, since the plurality of load cells 61 are used for measurement, the sum of the detected values of all the load cells 61 becomes the measured value.

Further, above the pagmil mixer 60, an additive supply pipe (additive supply device) 62 for injecting additives into the pagmill mixer 60 is provided, and this additive supply pipe 62 has an on-off valve (gate) not shown. is attached. Gates 14B and 23B of surge bins 14 and 23, opening and closing valves of additive supply pipe 62, and pug mill mixer 6
0, and the metering and mixing device 6 by the load cell 61.
5 is constructed so that new material, recycled material, and additives can be mixed in a predetermined mixing ratio in a pugmill mixer 60.

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.

This screed 5 is configured so that its overall length can be adjusted in the width direction of the traveling vehicle body A.
It is designed to be adjusted according to the road width. Also,
On the front surface of the screed 5, a plurality of ultrasonic sensors S for detecting the amount of collected regenerated mixture just before the screed 5 are arranged at intervals along the length of the spreeding screw 4. This ultrasonic sensor S detects the height of the regenerated mixture by emitting ultrasonic waves in the direction of the road surface, and calculates the total accumulated amount based on the detected value, which is input to the central processing unit CPU. There is.

As shown in FIG. 5, by controlling the speed of the preceding processing steps from this central processing unit CPU, the system is configured to perform harmonious processing as a whole. That is, in this embodiment, first, a signal S1 for controlling the speed of the rotary skyfires 20 and 21 is given from the central processing unit CP to the driving devices of the rotary skyfires 20 and 21.
Similarly, the burner 54 of the rotating drum heater 50
is given a signal S2 that controls its output. Further, a signal S3 for controlling the conveyance speed is given to the V-1 feeder 12 and V-2 feeder 13 for transferring new material, a signal S4 for controlling the batch amount is given to the metering and mixing device 65, and A signal S5 is given to the ding screw 4 to control its rotational speed.

The screw 5 is supported by a leveling arm 6 shown in FIG. 2, which is swingably provided with respect to the traveling vehicle body A, so that the pavement thickness 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, when materials are carried to both surge bins 14, 23 and survivin bins 14, 23, V second feeder 13 and R second feeder 25
is placed. These parts are swung together and held in a substantially constant position.

Furthermore, a control device (not shown) is incorporated in the road surface regeneration device equipped with the automatic supply device for the regeneration mixture. The main role of this control device is as follows. Setting and controlling the running speed, calculating the loosening amount by the lotus carificers 20 and 21 based on the measured value of the laser sensor 22, and controlling the combustion and temperature of the burner 54 of the rotary drum heater 50. , performing tilt control of the horizontal holding frame 40 that supports the rotating drum heater 50 , surge bin 14 ,
23 gates 14B, 23B and the additive supply valve (not shown), and the gate 64 of the pug mill mixer 60, the measurement signal of the load cell 61 is used to measure (compound) new materials and recycled materials. control, metering control of additives, etc.

Among these, the control device is configured so that the measurement result of the loosening amount 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 lag before the recycled material loosened 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 performed to gradually and automatically change the blending ratio within a limited range.

For example, when the mixing ratio of recycled material and new material was 6:4, the amount of scraping decreased rapidly.
It is assumed that the decreasing tendency of the surge bin 23 occurs after 5 minutes after the time delay. In such a case, the next batch is
The blending ratio is gradually changed automatically, such as 5.5:4.5, and then 5:5 for the next batch. 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 determined by the burner 54.
It has come to be used in connection with the control of For example, when the amount of loosening increases,
Control is performed to increase the thermal power of the burner 54 and to reduce the thermal power of the burner 54 when the amount of loosening decreases.

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

Next, the operation of the road surface regeneration device equipped with the automatic regeneration mixture supply device configured as described above will be explained.

In fact, when performing road surface regeneration work, two road heaters usually 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 uses rotary scarifiers 20 and 21 to loosen the pre-heated pavement of the road surface. The scraped material is recycled and fed into the drum heater 50 from the inlet of the rotary drum heater 50 by the R first feeder 24.

Next, as the drum 51 rotates, the recycled material gradually moves backwards, and during this time, the temperature is raised to a specified temperature by hot air generated by the burner 54, and the recycled material is heated to a specified temperature by the drum 5.
It falls onto the R second feeder 25 by the rake-up blade inside the R feeder 25. And R second feeder 2
5 to the surge bin 23, where the recycled material is temporarily stored.

On the other hand, new material is received by a hopper 10 from a dump truck running in front, transported to the rear by a V-1 feeder 12, transferred to a V-2 feeder 13 on the way, and finally delivered to a 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 mixing container 60A of the pug mill mixer 60. On the other hand, when the load cell 61 detects the weight and the detected value reaches a preset value, the gate 23B
Close. 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 regrinding and metering, the additive supply valve is opened and the additives are added. Finally, by opening and closing the gate 14B of the new material surge bin 14, the new agent is measured and supplied into the mixing container 60A of the pug mill mixer 60 in the same manner as the regenerant.

In this manner, each material is sequentially measured in batches and at the same time, mixing is performed by the Pakumil mixer 60 for a predetermined period of time. When the mixing for a predetermined period of time is completed, the gate 64 at the bottom of the milk 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. Surface regeneration work is carried out on the road continuously through the above steps.

During this work, the amount of collected regenerated mixture immediately before the screed 5 is measured by the ultrasonic sensor S. For example, if the amount of collected material decreases,
Spreadding Screw 4 is the central processing unit
It rotates quickly under the command of the CPU and spreads the regenerated mixture quickly, and the amount of discharge from the metering and mixing device 65 is increased, and the output of other devices is controlled accordingly. Moreover, when the amount of accumulation increases, the control is reversed. By controlling in this manner, the amount of regenerated mixture near the screed 5 can be maintained at an appropriate level.

Further, as the amount of loosening 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.

Furthermore, since the rotating drum heater 50 and the metering pug mill mixer 60 are always maintained in a constant posture even when the traveling vehicle A approaches the slope surface,
Demonstrate stable ability.

In the above embodiment, an ultrasonic sensor was used as a sensor to measure the amount of regenerated mixture immediately before screeding, but any type of sensor may be used, and a non-contact sensor may be used. The one is good.

In addition, although we have explained the case where the road heater is run in front of this device to heat the road surface in advance and then scrape it, the road surface that is not heated by the road heater can be scraped with the lotus carifier tires 20 and 21 to loosen the road surface. It is also possible to proceed.

[Effects of the Invention] As explained above, the present invention is provided with a sensor that detects the amount of accumulated recycled mixture just before the screed, and by using the detected data, the amount of accumulated recycled mixture can be maintained at an appropriate level. This makes it possible to perform stable leveling work and perform high-quality road surface regeneration.

[Brief explanation of drawings]

FIG. 1 is a plan view of a device according to 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 device, and FIG. FIG. 5 is a system diagram showing the overall flow of the apparatus of the same embodiment. A... Running vehicle, 4... Spreading screw, 5... Screed, 20, 21... Rotary caliph yer, 60... Pug mill mixer, 65... Measuring and mixing device, S... Ultrasonic sensor.

Claims (1)

[Claims] 1. On a running vehicle, there is a scarifier ear that loosens the road surface, a mixing device that mixes the recycled material scraped by the scarifier with new material that is separately supplied, and a recycled mixture mixed with this mixing device on the road surface. In a road surface regeneration device equipped with a spreading screw and a screed placed on the rear side of the spreading screw, a sensor is provided to measure the amount of recycled mixture accumulated immediately before the screed. A road surface regeneration device equipped with an automatic supply device for a regeneration mixture, characterized in that: