Cutter Receiver

Cutter Receiver

Road Scarifier Cutter Implementing Method Ii

The object of the invention includes also the road scarifier cutter operation method for the removal of asphalt from road surfaces through the cutting of the asphalt with preset depth and inclination, comprising a presetting cycle for the definition of the parameters to be obtained and a working cycle according to the contents of the independent claim regarding said method.

Further characteristics and details of the invention will be better highlighted in the description of one favourite application among many of the invention in question, illustrated in the enclosed drawings, wherein: Fig. 1 is a front view of the machine object of the invention; Fig. 2 is a plan view of the machine object of the invention, showing in particular the position of the hydraulic jacks with which the machine is equipped; Fig. 3 is a schematic section of the machine object of the invention along line III-III, showing in particular the hydraulic diagram of the front hydraulic jacks; Fig. 4 is a schematic section of the machine object of the invention along line IV-IV, showing in particular the hydraulic diagram of the rear hydraulic jacks and the machine inclination sensor;

Fig. 5 is a block diagram of the control devices with which the machine object of the invention is equipped; Fig. 6 shows a section of the road surface removed by the machine object of the invention; Fig. 7 shows by means of a table the possible operation modes of the rear actuators and of the inclination sensor of the machine object of the invention.

With reference to the figures mentioned above, it can be observed that the road scarifier, indicated as a whole by 1 in Fig. 1, is provided with a frame 2 supported by tracks 3, 4, 5 and 6, on which the same number of jacks indicated by 7, 8, 9 and 10 rest, as shown in Fig. 2.

The road scarifier is equipped with a cutting drum 11 suitable for working on the road surface 12 according to the position of the hydraulic jacks that lift or lower the frame 2 as required by the work programme.

It must be observed that road scarifiers are generally provided with front jacks 8 and 9 operated by a single hydraulic control, so that they act together as if they were a single central jack positioned at the front of the machine, as shown in the hydraulic diagram of Fig. 3. On the other hand, as far as the rear jacks 7 and 10 are concerned, these are controlled independently of each other and can have different configurations, so that the cutting drum 11 can be parallel to the road surface, or inclined as much as necessary to obtain the scarification according to a given profile, for example with sloping sides, in such a way as to obtain an asphalt covering having certain specific characteristics.

According to the invention, the road scarifier 1 is provided on both sides with sensors, indicated by 13 and 14, respectively, that can be seen in Fig. 2 and 1. These sensors can be ultrasound sensors or reflection sensors and serve to measure the distance between said sensors and the road bed.

As it can be observed in the block diagram of Fig. 5, the sensors 13 and 14 send their signals to first programming and controlling data processing systems indicated by 16 and 17, respectively. More particularly, the sensors 13 send their signals to the data processing system 16 and the mean of said signals is made and shown on a display 161.

Analogously, the sensors 14 send their measure signals to the data processing system 17, which shows the mean of the readings on the display 171.

As already explained, the road scarifier is also provided with a frame inclination sensor indicated by 18, which in fact shows the inclination angle alpha of the frame with respect to the horizontal line of the machine. Since the cutting drum 11 is integral with the frame 2, the inclination of the frame obviously corresponds to the inclination of the cutting drum, which is the inclination that is actually relevant to the work performed by the machine. Even in this case the inclination sensor 18 is connected to a further first data processing system 19 that shows the measured inclination, expressed in degrees, on the display 191.

According to the invention, it is possible to set two of the three parameters necessary for the setting of the scarification in the first data processing systems 16, 17 or 19, since the third parameter can be derived from the other two. More particularly, it is possible to set the left and right scarification depth parameters in the data processing systems 16 and 17 through the displays 162 and 172, respectively.

Obviously, if the right and left scarification depth values are the same, the angle alpha on the display 192 of the data processing system 19 will be equal to 0. The situation will be different if the left scarification depth value differs from the right scarification depth value and in this case the value of the angle alpha will be derived directly from the difference between the two values set.

It is clear, therefore, that to preset the operation parameters of the road scarifier it will be necessary to preset two of the first three data processing systems 16, 17 and 19, that is, the respective values required, the third value resulting directly from the other two.

More particularly, if the two scarification depth values are set, the inclination angle value will be set as a consequence of the other two.

It is also possible to set the value of the left or right scarification depth together with the desired inclination angle, and the other right or left scarification depth value will be consequently defined and preset and then automatically displayed by the first data processing systems.

When the machine is in operation, each data processing system 16, 17 or 19 carries out a comparison between the scarification depth or angle set and the corresponding readings, by means of an electronic processor. Consequently, a difference signal delta S, delta D and delta alpha is sent out by the first data processing system 16, or 17, or 19, respectively.

These difference signals are received by a second data processing system PLC, indicated as a whole by 20, which processes the signals received and sends control signals to hydraulic left and right actuators, indicated by 21 and 22, respectively, which control the hydraulic cylinder 10 and the hydraulic cylinder 7, respectively, so that the lifting or lowering of each one of the hydraulic cylinders tends to reduce to zero the difference signals delta received by the first data processing systems 16, 17 and 19.

It is clear that in this way the road scarifier object of the invention, with its control device, controls all the parameters regarding the scarification carried out by the cutting drum and adapts the position of the machine through the operation of the hydraulic jacks, in such a way as to follow the desired scarification profile.

From an operational point of view, the first step necessary to carry out the scarification according to preset parameters as described herein is represented by the setting of the parameters, which is followed by the actual scarification process.

For the parameter setting cycle, first of all it is necessary to operate the hydraulic jacks of the machine, in such a way as to lift the frame with the maximum extension, that is, at the maximum distance of the same from the ground, after which the jacks must be lowered until the cylinder rests on the ground. With the cylinder resting on the ground and parallel to the road surface to be scarified, the measured values shown by the displays 162, 172 and 192 are read and then set to zero by means of the reset buttons positioned on each first data processing system, indicated by 163, 173 and 193. Once the values are set to zero, the desired values are set in two of the three displays 162, 172, 192 belonging to the data processing systems 16, 17 and 19, according to one of the combinations shown by the table in Fig. 7.

For example, as it can be observed for the setting 1 of the selector 30, the value LS can be set in the display 162, the value LD in the display 172, and the angle alpha will be set in the display 192 as a consequence of the other two settings.

Another option is available, according to position 2 of the selector 30 of Fig. 7, if the operator decides to set the right scarification depth value LB and the inclination angle alpha . In this case the left scarification value LS will automatically derive from the other two settings.

It may also happen, as shown in line 4 and 5 of the table of Fig. 7, that the left or right cylinder respectively are kept inoperative and therefore fixed in their initial position. The position 6 indicates that the machine is at rest.

Therefore, once two of the three reference values have been set, as explained above, in each one of the first data processing systems 16, 17, or 19, it is possible to start the work.

As soon as the scarification work is started, the sensors 13, 14 and 18 transmit the scarification depth and inclination angle values measured to the respective data processing systems. These values are compared with the set depth and inclination angle values and, if there is a difference between the values read and those set, the first data processing systems send out a difference signal delta S, delta D or delta alpha . These signals are received by a data processing unit, for example a PLC indicated by 20, which sends out one or two signals, 21 and 22, that operate the hydraulic actuators 7 and 10. Said cylinders are operated in order to obtain a variation in the position of the frame 2, in such a way as to reduce to zero the difference delta 5, delta D or delta alpha signalled by the first data processing systems 16, 17 and 19.

If the machine keeps working with constant value readings and if the readings substantially correspond to the preset values, no difference signal will be sent out by the first data processing systems and consequently the PLC 20 will not emit any signal to operate the hydraulic actuators 7 and 10.

It is clear that, according to the invention, it is possible to obtain the full automatic control of the geometrical configuration of the scarification profile, after presetting the starting data.

It is also obvious that thanks to this possibility of presetting the parameters the road scarifier cutter can obtain any scarification profile, an example of which is shown in Fig. 6.

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