EP4190973A1 - Machine à fraiser le sol, en particulier machine à fraiser ou à recycler, et procédé de fonctionnement d'une machine à fraiser le sol - Google Patents

Machine à fraiser le sol, en particulier machine à fraiser ou à recycler, et procédé de fonctionnement d'une machine à fraiser le sol Download PDF

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Publication number
EP4190973A1
EP4190973A1 EP22210922.5A EP22210922A EP4190973A1 EP 4190973 A1 EP4190973 A1 EP 4190973A1 EP 22210922 A EP22210922 A EP 22210922A EP 4190973 A1 EP4190973 A1 EP 4190973A1
Authority
EP
European Patent Office
Prior art keywords
flap
roller
milling
milling machine
ground
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22210922.5A
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German (de)
English (en)
Inventor
Christoph Menzenbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wirtgen GmbH
Original Assignee
Wirtgen GmbH
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Filing date
Publication date
Application filed by Wirtgen GmbH filed Critical Wirtgen GmbH
Publication of EP4190973A1 publication Critical patent/EP4190973A1/fr
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
    • E01C23/085—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using power-driven tools, e.g. vibratory tools
    • E01C23/088—Rotary tools, e.g. milling drums
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/065—Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving

Definitions

  • the invention relates to a ground milling machine, in particular a stabilizer or recycler, which has a machine frame supported by running gears, on which a milling/mixing roller is arranged, which is arranged in a roller housing which is open at the bottom and has a roller flap at the rear in the working direction, which a pivot axis extending transversely to the longitudinal direction of the ground milling machine can be pivoted.
  • the invention relates to a method for operating such a ground milling machine.
  • Stabilizers are known for stabilizing insufficiently stable soils, with which a powdered or liquid binder is introduced into the soil in order to increase its load-bearing capacity.
  • Self-propelled and non-self-propelled stabilizers that are mounted on or towed by a towing vehicle are known.
  • the well-known recyclers differ from the stabilizers in that the recyclers serve not only to improve or solidify soil, but also to rehabilitate damaged top layers of roads or paths.
  • Stabilizers or recyclers have a machine frame on which a milling/mixing roller is arranged for milling the soil to be stabilized or the top layer to be rehabilitated, which is located in a roller housing that is open at the bottom.
  • the roller housing has a front roller flap in the working direction and a rear roller flap in the working direction, which can be pivoted about a pivot axis running transversely to the longitudinal direction of the machine frame.
  • the roller housing is closed at the sides by side parts extending in the longitudinal direction.
  • the volume enclosed by the roller housing forms a mixing space for the milled material and the binding agent.
  • On the roller housing there are one or more dosing devices that provide a predetermined amount of possibly different binders or water for the volume of the mixing chamber.
  • a roller flap adjustment device is provided in each case, which has at least one actuator for pivoting the front or rear roller flap and a control device for actuating the at least one actuator, so that the lower edge of the front or rear roller flap in adjustable in height from the floor.
  • the control device of the rear roller flap is designed in such a way that the at least one actuator is controlled during milling operation in such a way that the rear roller flap lies in a floating position with a predetermined contact force on the ground.
  • the known stabilizers or recyclers have a milling/mixing roller adjustment device that is designed in such a way that the height of the milling/mixing roller relative to the machine frame can be adjusted, so that the milling depth can be changed.
  • Raising the lower edge of the rear roller flap after the milling/mixing roller has been attached or the milling depth has been increased can prevent the material that has accumulated during the advance of the tiller from the roller housing.
  • the rear roller flap is opened too far, there is a risk that material will be thrown backwards out of the roller housing.
  • the object of the invention is to improve the operation of a ground milling machine or its working result, in particular when applying the milling/mixing roller to start milling or when increasing the milling depth during milling.
  • One object of the invention is, in particular, to avoid a build-up of material when applying the milling/mixing drum or when increasing the milling depth, or to ensure an optimal mixing ratio of milled material and binding agent.
  • a further object of the invention is to avoid an increase in the power required to operate the milling/mixing drum or a reduction in the working speed when applying the milling/mixing drum or when increasing the milling depth
  • Another object of the invention is to provide a method with which a ground milling machine can be operated, in particular when applying the milling/mixing roller to start milling or when increasing the milling depth during milling to avoid material jams.
  • the ground milling machine according to the invention in particular a stabilizer or recycler, and the method according to the invention are characterized by a roller flap position correction mode, which can be activated manually after the milling/mixing roller has been attached and the ground milling machine has started up or during the actual milling operation after the milling depth has been increased or activated automatically.
  • the drum flap position correction mode comprises at least one roller flap position correction cycle to optimize the position of the rear roller flap so that material build-up and the problems resulting therefrom are largely avoided.
  • the roller flap position correction mode can be activated manually by the machine operator or can be started fully automatically, so that manual intervention is not necessary. Manual intervention is not required while operating the tiller in the drum flap position correction mode. After the roller flap position has been corrected, the roller flap position correction mode can be deactivated again automatically.
  • the control device of the roller flap adjustment device is designed in such a way that in the at least one roller flap correction cycle, the floating position of the rear roller flap is canceled in a first step and the rear roller flap is pivoted upwards from a first pivoted position into a second pivoted position, so that the lower edge of the rear roller door is raised. Consequently, the material accumulated in the roller housing can flow out.
  • the pivoting angle by which the drum flap is pivoted upwards can be specified by the control device.
  • the roller housing should be opened wide enough so that accumulated material can flow out of the roller housing unhindered on the one hand, but not so wide that there is a greater risk of material being thrown out on the other.
  • the floating position is set again, so that the rear roller flap assumes a third pivoting position in which the lower edge of the rear roller flap rests on the ground.
  • the at least one roll flap position correction cycle includes a checking routine.
  • the basic principle of the checking routine is to monitor the movement of the roller flap after the return to the floating position.
  • the checking routine provides for comparing a variable that correlates with the third pivot position with a threshold value or a variable that correlates with the third pivot position with the value of a variable that correlates with the first pivot position, the roller flap position correction mode based on a comparison of the value with the third pivot position correlating variable is deactivated with a threshold value or on the basis of a comparison of the value of a correlating with the third pivot position variable with the value of a correlating variable with the first pivot position.
  • the drum flap position correction mode can be deactivated.
  • a threshold value can be defined for the movement of the drum flap. If the movement of the roller flap after re-floating is less than or equal to the threshold, ie. H. If the roll flap has not fallen back by a predetermined amount, another roll flap position correction cycle is carried out. On the other hand, if the movement of the drum flap is greater than the threshold value, i. H. the platen flap has fallen back a predetermined amount, the platen flap position correction mode is deactivated.
  • the variable that correlates with the pivot positions can be a variable that can be easily detected with little technical effort.
  • the Evaluation of the values of this size depends on whether the size increases or decreases as the roller flap is raised. For example, if the quantity is a pan angle, the evaluation depends on which angle is defined as the pan angle. Different mathematical methods can be used to compare the variables that correlate with the pivot positions before and after the cutting flap is raised.
  • variable correlating with the first and third pivot position is a variable correlating with the height of the lower edge of the rear roller flap.
  • the value of this variable increases when the drum flap is opened.
  • the roller flap position correction cycles are carried out until it is determined at least once that the height of the lower edge of the rear roller flap in the third pivoting position is equal to or less than the height of the lower edge of the rear roller flap in the first pivoting position .
  • a further roll flap position correction cycle is carried out if the height of the lower edge of the rear roll flap in the third pivoted position is greater than the height of the lower edge of the rear roll flap in the first pivoted position. Consequently, the platen position correction mode may be terminated after only one or more platen position correction cycles.
  • the roller flap position correction mode can therefore only include one roller flap position correction cycle if it is to be checked only once that the lower edge of the rear roller flap in the third pivoting position is equal to or smaller than the height of the lower edge of the rear roller flap in the first pivoting position and this is the case.
  • the repeated determination of these conditions has the advantage that the roller flap position correction mode is only deactivated when a state of equilibrium has been set permanently.
  • the height of the bottom edge of the roller flap is a quantity related to a reference plane, which may be the unmilled ground. If the height of the floor in relation to the machine frame or to the roller housing is known, the height of the lower edge of the roller flap can be determined from the height of the roller flap in relation to the machine frame or the roller housing.
  • the at least one actuator of the roller flap adjustment device can be a piston-cylinder arrangement that acts on the roller flap, with a measuring unit that detects the position of the piston of the piston-cylinder arrangement, in particular a distance sensor, can be provided.
  • the piston of the piston-cylinder arrangement can be pivotally attached to the machine frame and its cylinder to the roll flap, or vice versa. This embodiment can be easily implemented without major technical effort. In this embodiment, the pivot positions can be compared simply by comparing the stroke of the piston when lifting with the stroke of the piston when lowering. If the piston is extended during lowering by a smaller distance than the piston was retracted when raising the roller flap, i. H.
  • roller flap remains in its upper position or is raised even further by the material flow, another roller flap position correction cycle is carried out. If, on the other hand, the roller flap falls back into a lower position after being raised due to the absence of a material flow, the check is terminated.
  • the control device of the roller flap adjustment device is preferably designed in such a way that the floating position is set again in the second step after a predetermined time interval has elapsed or after a predetermined distance has been covered after the floating position has been canceled or the roller flap has been pivoted into the third pivoted position.
  • the time interval or the distance can be measured taking into account the dynamic conditions in relation to the material flow during milling.
  • a further preferred embodiment provides a memory in which a swivel angle or a variable correlating with the swivel angle is stored for different milling depths, by which the rear drum flap is pivoted from the first to the second pivoted position, the control device of the drum flap adjusting device is designed in such a way that, depending on the set milling depth, the swivel angle or a variable that correlates with the swivel angle is read from the memory.
  • the control device of the roller flap adjustment device can have an operating element, for example a knob or switch or a button on a touch-sensitive screen (touchscreen), the control device being designed in such a way that the roller flap position correction mode is activated by actuating the operating element is activated.
  • an operating element for example a knob or switch or a button on a touch-sensitive screen (touchscreen)
  • the control device of the roller flap adjustment device can also be designed in such a way that the roller flap position correction mode is activated fully automatically when, after the ground milling machine has started up milling operation, a predetermined time interval has elapsed or the ground milling machine has covered a predetermined distance.
  • the point in time at which the ground milling machine starts up can be determined by monitoring control signals that can be made available by the central control and computing device of the ground milling machine, or by acquiring measured values from suitable sensors, for example distance sensors.
  • a ground milling machine generally has a milling/mixing roller adjustment device that is designed in such a way that the height of the milling/mixing roller relative to the machine frame can be adjusted so that the milling depth can be changed
  • the control device for the roller flap adjustment device can be designed in such a way that the roller flap position correction mode is activated when the milling/mixing roller adjustment device has increased the milling depth by a predetermined value during milling operation and after the increase in the milling depth a predetermined time interval has elapsed or the milling/mixing roller adjustment device has increased the milling depth during of the milling operation has increased by a specified value and after the increase in the milling depth the ground milling machine has covered a specified distance.
  • the time interval or the distance can be measured taking into account the dynamic conditions during the milling operation.
  • the milling/mixing drum can be adjusted in height relative to the machine frame, with the machine frame being supported by lifting columns which are fastened to running gear, so that the height of the machine frame can be adjusted relative to the ground.
  • the ground milling machine has a chassis 1 that includes two front drives 2 and two rear drives 3 .
  • the drives are 2, 3 wheels.
  • Lifting columns 4 are fastened to the drives 2, 3 and carry a machine frame 5, so that the height of the machine frame relative to the floor 6 can be adjusted.
  • the driver's cab 7 is located on the machine frame 5.
  • a roller housing 8 which is open at the bottom and in which a milling/mixing roller 9 is located is arranged on the machine frame 5.
  • the direction of rotation of the milling/mixing drum is marked with an arrow 10 .
  • the roller housing 8 has a front roller flap 12 in the working direction 11 and a rear roller flap 13 in the working direction, which can each be pivoted about a pivot axis 14' or 14 running transversely to the longitudinal direction of the machine frame. On the sides, the roller housing is closed by side parts 15 extending in the longitudinal direction 1 are only hinted at.
  • the ground milling machine has a milling/mixing roller adjustment device 16, which in the present exemplary embodiment comprises a piston-cylinder arrangement 17 with a piston 17A and a cylinder 17B.
  • a milling/mixing roller adjustment device 16 By actuating the piston 17A of the piston-cylinder arrangement 17, the height of the milling/mixing drum 9 can be adjusted relative to the machine frame 5 or the base 6, with the axis of the milling/mixing drum moving on a circular path.
  • a height adjustment of the milling/mixing roller 9 relative to the ground 6 is also possible by retracting or extending the lifting columns 4 .
  • control device 18 To control the piston-cylinder arrangement 17 of the milling/mixing roller adjustment device 16, an in 1 not shown control device 18 is provided which has a control and Comprising computing unit 18A, which can form a separate control and computing unit or can be part of a central control and computing device, not shown, of the ground milling machine ( 2 ).
  • a front and rear roller flap adjustment device 19 is provided to adjust the position of the front and rear roller flaps 12, 13 in the working direction.
  • a front and rear roller flap adjustment device 19 is provided. In the exemplary embodiments described below, only the rear roller flap is considered.
  • the roller flap adjusting device 19 of the rear roller flap 13 has at least one actuator 20 acting on the roller flap.
  • the actuator is a piston-cylinder arrangement 20, the piston 20A of which is attached to the machine frame 5 and the cylinder 20B of which is attached to the rear roller flap 13 in a pivotable manner.
  • the rear roller flap 13 By moving the piston 20A of the piston-cylinder assembly 20 to a specific position, which is hereinafter referred to as a, or by retracting or extending the piston 20A from an initial position by a predetermined distance, which is hereinafter referred to as ⁇ a the rear roller flap 13 can be pivoted upwards or downwards about the pivot axis 14 running transversely to the working direction into a predetermined pivoting position ⁇ or by a predetermined pivoting angle ⁇ , which correlates with the distance ⁇ a, so that the lower edge 13A of the roller flap 13 is opposite the bottom 6 can be raised or lowered ( Figure 3A ).
  • roller flap adjustment device 19 has an in 1 non-illustrated control device 21, which includes a control and computing unit 21A, which can form a separate control and computing unit or can be part of the central control and computing device of the ground milling machine ( 2 ).
  • the control and processing unit 21A of the control device 21 of the drum flap adjusting device 19 can, for example, be a general processor, a digital signal processor (DSP) for continuous processing of digital signals, a microprocessor, an application-specific integrated circuit (ASIC), an integrated circuit consisting of logic elements ( FPGA) or other integrated circuits (IC) or hardware components to control the actuators.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA logic elements
  • IC integrated circuits
  • a data processing program software can run on the hardware components.
  • a combination of the various components is also possible.
  • the roller flap adjusting device 19 also includes other components known to those skilled in the art, in particular hydraulic components, for example hydraulic pumps, hydraulic valves, hydraulic lines.
  • the ground milling machine has a drive device (not shown) for hydraulic components, for example hydraulic pumps or hydraulic motors, for example for driving the running gear.
  • a drive device for hydraulic components, for example hydraulic pumps or hydraulic motors, for example for driving the running gear.
  • the machine operator moves the soil milling machine to the desired position with the milling/mixing drum 9 raised.
  • the lifting columns 4 are largely extended and the milling/mixing drum 9 is moved to an upper position ( Figure 3A ).
  • the lifting columns 4 are then largely retracted and the milling/mixing roller 9 is brought into a position in which it touches the ground 6 touches. This process is also known as scratching.
  • the piston 20A of the piston-cylinder assembly 20 is in the "a 0" position and the roller flap 13 is in the pivoted position " ⁇ 0" ( Figure 3B ).
  • a zero adjustment takes place for the milling/mixing roller adjustment device 16, so that the milling/mixing roller can be lowered further or the piston 17A of the piston-cylinder assemblies 17 of the milling/mixing roller adjustment device 16 by a predetermined distance corresponds to the milling depth.
  • the change in length of the piston-cylinder arrangement does not necessarily have to correspond to a change in milling depth in a ratio of 1:1.
  • the change in milling depth can be calculated from the stroke of the piston 17A, taking into account the geometric conditions.
  • a reference plane which corresponds to the surface of the unmilled floor 6 is established with the zero adjustment.
  • the milling depth can thus be set via the distance to be covered by which the milling/mixing drum 9 is lowered relative to the machine frame 5 or the ground surface or the piston 17A is moved in or out, or the milling depth can be adjusted when lowering the milling/mixing drum Mixing roller or moving the piston can be determined from the distance covered.
  • the distance traveled can be recorded with the known distance sensors.
  • the milling/mixing drum 9 is now lowered to the desired milling depth so that the milling process begins ( Figure 3C ).
  • FIG. 2 shows a simplified hydraulic circuit diagram of an embodiment for realizing a floating position for the piston-cylinder arrangement 20 of the roller flap adjusting device 19.
  • a hydraulic valve 22 connects the upper and lower cylinder chambers of the piston-cylinders via the hydraulic lines 23, 24 connected to the cylinder connections -Arrangement 20 for raising and lowering the rear roller flap 13 with a hydraulic tank, not shown, so that the chambers are not subjected to the system pressure.
  • the hydraulic valve 22 is a 4/3-way valve.
  • the hydraulic lines leading to the hydraulic valve 22 are in 2 not shown for the sake of simplicity. Since no specific hydraulic force acts on the cylinder, the piston 20A can move in the cylinder 20B, so that the roller flap 13 moves downward due to its weight.
  • one or the other hydraulic line 23, 24 can be subjected to the system pressure (pressure line) or connected to the tank (tank line), so that the piston 20A is moved up or down.
  • the drum flap adjustment device 19 can also be designed in such a way that the drum flap 13 does not rest on the ground under its own weight, but is loaded or relieved with an additional contact force. If both chambers are subjected to a pressure in the floating position, which preferably does not correspond to the system pressure, the downward movement of the cylinder flap can be supported by a corresponding design of the effective contact surfaces of the cylinder, for example with the same pressure in both cylinder chambers.
  • the invention can also be implemented by a roller flap adjustment device 19 with a single-acting piston-cylinder arrangement.
  • a single-acting piston-cylinder arrangement is characterized in that it can only be actuated in one direction.
  • the roll flap adjustment device 19 only needs to be able to raise the roll flap.
  • the floating position is achieved in that when no hydraulic pressure is applied to the piston-cylinder arrangement, the roller flap sinks in the direction of gravity due to its own weight.
  • FIGS 3C and 3D show the roller housing 8 when the milling/mixing roller 9 ( Figure 3C ) and after starting up the ground milling machine ( 3D ).
  • 3D shows the point in time at which the material 25 has reached the rear roller flap 13.
  • the control device 21 of the drum flap adjusting device 19 or the central control and computing device of the ground milling machine, which can include the control and computing unit of the control device of the drum flap adjusting device, is configured such that the following method steps are carried out.
  • the roll flap adjustment device 19 provides a roll flap position correction mode that can be activated manually or automatically and comprises at least one roll flap position correction cycle.
  • control device 21 of the roller flap adjustment device 19 has an operating element 26 ( 2 ) which the machine operator can actuate after starting the ground milling machine or after setting a greater milling depth during milling operation.
  • operating element 26 When operating element 26 is actuated, a control signal is generated, which control and computing unit 21A of control device 21 of roller flap adjustment device 19 receives.
  • the platen position correction mode is switched on, so that a first platen position correction cycle is carried out.
  • the piston 20A of the piston-cylinder arrangement 20 is moved by a predetermined distance ⁇ a 2 , which is connected to a distance sensor 28 ( 2 ) can be detected, retracted.
  • the distance a 2 or ⁇ a 2 which is a variable that correlates with the pivot position, in particular the height of the lower edge 13A of the roller flap 13, can be read from a memory 27 ( 2 ) are read out, in which a swivel angle or a distance correlating with the swivel angle is stored for different milling depths to be set.
  • Figure 3G shows the time at which the rear drum flap 13 from the first pivoted position (h 11 ) ( Figure 3E ) has been lifted into the second pivoted position (h 21 ) after the floating position has been removed
  • Figure 3H shows the point in time at which the rear roller flap 13 has assumed the third pivoting position (h 31 ) after the floating position has been reset. Since milled material has flowed in in the meantime, it can be seen that the third swivel position ( Figure 3H ) largely the second swivel position ( Figure 3G ) corresponds, ie h 31 ⁇ h 21 in the present exemplary embodiment. In this case, h 31 is greater than h 11 .
  • the drive device When the ground milling machine is started and the milling depth is greater than zero, the drive device generates a control signal which the control and computing unit 21A of the control device 21 of the drum flap adjustment device 19 receives. After receiving the control signal, a timer 21AA or an odometer 21AB starts set. Timer and/or odometer can be part of the drum flap adjusting device 19, in particular its control and computing unit 21A, or other components of the ground milling machine.
  • the control device 21 switches off the floating position in a first step and pivots the rear drum flap 13 out of the first pivoting position ( Figure 3E ) upwards to the second swivel position ( Figure 3G ). Then, in a second step, the floating position is switched on again, so that the rear roller flap 13 has a third pivoted position ( Figure 3H ) occupies, in which the lower edge 13A rests on the milled material 25.
  • the roller flap position correction mode is also activated automatically when the milling/mixing roller adjustment device 16 generates a control signal which signals to the control and computing unit 21A of the control device 21 of the roller flap adjustment device 19 that the milling/mixing roller adjustment device during the milling operation has increased the milling depth by a specified value.
  • the rear roller flap 13 still exerts a not inconsiderable counter-pressure on the material, so that material can continue to accumulate. This applies to both starting and increasing the milling depth.
  • another roller flap position correction cycle is carried out.
  • the roll flap position correction cycles are carried out until it is determined that the in Figure 3F shown state of equilibrium.
  • the roll flap position correction cycle of the roll flap position correction mode includes a checking routine.
  • control device 21 of the roller flap adjustment device 19 is designed to carry out the checking routine configured that on the basis of a comparison of the value of the variable correlating with the third pivot position, which is the distance ⁇ a in the present exemplary embodiment, with a threshold value, a state of equilibrium is inferred. Taking the dynamic conditions into account, different threshold values can be defined, which can be stored in the memory 27 and read out by the control and computing unit 21A of the control device 21 of the drum flap adjustment device 19 .
  • the control device records the distance ⁇ a 3 that the piston 20A of the piston-cylinder arrangement 20 of the roller flap adjustment device 19 has retracted during pivoting from the second to the third pivoting position ( Figure 3G , Figure 3H ).
  • the distance ⁇ a 3 is measured when a predetermined time interval has elapsed after the floating position has been reset or the ground milling machine has covered a predetermined distance.
  • the timer 21AA which specifies a predetermined time interval, or the odometer 21AB is started.
  • other timers or odometers can also be provided.
  • the time interval or the distance for the check can be different from the time interval or the distance for the automatic activation of the drum flap position correction mode.
  • the control device 21 of the roller flap adjustment device 19 controls its piston-cylinder arrangement 20 again in such a way that the first and second steps described above are carried out.
  • the floating position is switched off and the rear roller flap 13 is moved from a first pivoted position ( Figure 3I ), in which the rear roller flap is floating on the milled material 25 rests (h 12 ), upwards into a second pivoting position ( Fig. 3J ) pivoted (h 22 ).
  • the piston 20A of the piston-cylinder arrangement 20 of the roller flap adjusting device 19 is retracted by a predetermined distance ⁇ a.
  • the floating position is then switched on again, so that the rear roller flap 13 falls into a third pivoting position (h 32 ) ( Figure 3K ).
  • the control device again detects the distance ⁇ a that the piston 20A of the piston-cylinder arrangement 20 of the roller flap adjustment device 19 has retracted during pivoting from the second to the third pivoting position.
  • the checking routine described above is then carried out again.
  • the distance ⁇ a is less than the threshold or equal to the threshold, ie the roll flap 13, like the Figures 3I to 3K show has not fallen back by a minimum amount from the second gift position, an equilibrium state is not concluded and the verification cycle is repeated. If, on the other hand, the distance ⁇ a is greater than the threshold value, ie the drum flap has fallen back, an equilibrium state is concluded. The verification cycle is repeated until the in Figure 3F has set the state of equilibrium shown, ie it is determined that the distance ⁇ a is greater than the threshold value.
  • Figure 3L shows the first pivoting position (h 13 ), Fig. 3M the second pivot position (h 23 ) and Figure 3N the third pivot position (h 33 ) of a further roll flap position correction cycle.
  • the roller flap 13 falls by a relatively large amount, with the distance ⁇ a being greater than the threshold value, so that a state of equilibrium can be concluded (h 33 ⁇ h 23 ).
  • the drum flap position correction mode is then deactivated.
  • the roller flap position correction mode is not yet deactivated if it is determined only once that the distance ⁇ a is greater than the threshold value. Rather, another verification cycle is performed to verify whether the roller flap falls back again by an amount that is greater than the threshold value.
  • an equilibrium condition is determined based on a comparison of the value of the with the third pivot position ( Figure 3H ) correlating variable, which is the distance a 3 or ⁇ a 3 in the present exemplary embodiment, with the value associated with the first pivoting position ( Figure 3E ) correlating variable, which is the distance a 1 or ⁇ a 1 in the present exemplary embodiment. If a steady state condition has been determined at least once, the checking routine is terminated and the drum flap position correction mode is deactivated. Otherwise, another verification cycle is performed.
  • the control device 21 of the roller flap adjustment device 19 is configured in such a way that the distance ⁇ a (hereinafter referred to as ⁇ A) by which the piston 20A of the piston-cylinder assembly 20 of the roller flap adjustment device 19 is retracted to raise the rear roller flap 13 is compared with the distance ⁇ a (hereinafter referred to as ⁇ B) by which the piston of the piston-cylinder arrangement is extended when the rear roller flap falls back, ie the amount by which the roller flap is lifted is compared with the amount , by which the milling/mixing drum falls back.
  • the controller performs another roller flap position correction mode when the distance ⁇ B is less than the distance ⁇ A.
  • the drum flap position correction mode is deactivated when it is determined that the distance ⁇ B is equal to the distance ⁇ A or greater than the distance ⁇ A.
  • the roller flap thus remains in the floating position and is pulled floating over the surface of the milled soil.
  • the roller flap position correction mode is only deactivated if the distance ⁇ B is equal to or greater than the distance ⁇ A in at least two consecutive roller flap position correction cycles.
  • the Figure 3G or. Fig. 3J shows the rear roller flap 13 in the second pivot position and Figure 3H or.
  • Figure 3K shows that the drum flap has pivoted upwards compared to the first pivoted position into the third pivoted position (h 31 >h 11 or h 32 >h 12 ), since material has meanwhile flowed in, i.e. the drum flap has opened after a specified time interval or after a predetermined distance has been covered, is lowered by an amount which is less than the amount by which the drum flap has been raised, which is determined by comparing the detected distances ⁇ A and ⁇ B.
  • the height of the lower edge 13A of the roller flap 13 is in the third pivot position ( Figure 3H or. Figure 3K ) higher than before lifting (3E or Figure 3I ). Consequently, a state of equilibrium for the material flow has not yet been established, so that another verification cycle is carried out.
  • FIGS 3L to 3N show that the height of the lower edge 13A of the rear roller flap 13 in the third pivoting position ( Figure 3N ) largely the height of the drum flap in the first pivoting position ( Figure 3L ) corresponds, so that it is determined that a state of equilibrium has been established.
  • the control device 21 of the roller flap adjustment device 19 can also be configured in such a way that the roller flap position correction mode can only be automatically activated again when the milling/mixing roller has been brought back into the zero position. This prevents the drum flap position correction mode from being activated automatically after the ground milling machine has only been at a temporary standstill.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Road Repair (AREA)
  • Crushing And Grinding (AREA)
EP22210922.5A 2021-12-03 2022-12-01 Machine à fraiser le sol, en particulier machine à fraiser ou à recycler, et procédé de fonctionnement d'une machine à fraiser le sol Pending EP4190973A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021131906.4A DE102021131906A1 (de) 2021-12-03 2021-12-03 Bodenfräsmaschine, insbesondere Stablisierer oder Recycler, und Verfahren zum Betreiben einer Bodenfräsmaschine

Publications (1)

Publication Number Publication Date
EP4190973A1 true EP4190973A1 (fr) 2023-06-07

Family

ID=84370847

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22210922.5A Pending EP4190973A1 (fr) 2021-12-03 2022-12-01 Machine à fraiser le sol, en particulier machine à fraiser ou à recycler, et procédé de fonctionnement d'une machine à fraiser le sol

Country Status (4)

Country Link
US (1) US20230175213A1 (fr)
EP (1) EP4190973A1 (fr)
CN (2) CN219793570U (fr)
DE (1) DE102021131906A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004012382B4 (de) 2004-03-13 2014-03-13 Deere & Company Hydraulische Anordnung
EP2840183A1 (fr) * 2013-08-23 2015-02-25 Wirtgen GmbH Engin autopropulsé et procédé de fonctionnement d'un engin automoteur
EP2977514B1 (fr) 2014-07-23 2017-07-05 Wirtgen GmbH Machine de travail du sol et procédé de fraisage de sols ou de voies de circulation
US20210317621A1 (en) * 2020-04-14 2021-10-14 Caterpillar Paving Products Inc. Machine, system, and method for work cycle automation
EP4067573A1 (fr) * 2021-04-01 2022-10-05 Wirtgen GmbH Machine de construction autonome et procédé de fonctionnement d'une machine de construction autonome

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9797100B1 (en) 2016-05-23 2017-10-24 Caterpillar Paving Products Inc. Milling machine
US11453984B2 (en) 2020-11-24 2022-09-27 Caterpillar Paving Products Inc. Reclaimer having a drum chamber door control system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004012382B4 (de) 2004-03-13 2014-03-13 Deere & Company Hydraulische Anordnung
EP2840183A1 (fr) * 2013-08-23 2015-02-25 Wirtgen GmbH Engin autopropulsé et procédé de fonctionnement d'un engin automoteur
EP2977514B1 (fr) 2014-07-23 2017-07-05 Wirtgen GmbH Machine de travail du sol et procédé de fraisage de sols ou de voies de circulation
US20210317621A1 (en) * 2020-04-14 2021-10-14 Caterpillar Paving Products Inc. Machine, system, and method for work cycle automation
EP4067573A1 (fr) * 2021-04-01 2022-10-05 Wirtgen GmbH Machine de construction autonome et procédé de fonctionnement d'une machine de construction autonome

Also Published As

Publication number Publication date
CN219793570U (zh) 2023-10-03
US20230175213A1 (en) 2023-06-08
DE102021131906A1 (de) 2023-06-07
CN116219848A (zh) 2023-06-06

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