JPH03199513A - Controller in road surface cutter device - Google Patents

Abstract

PURPOSE:To avoid overload operation of a cutter device by detecting a load to a cutter driving means that drives a cutter rotor, and, when an overload condition is detected, by temporarily elevating the cutter rotor. CONSTITUTION:A load detection means 70 is provided, so as to detect a load to cutter driving means 17L, 17R that rotate and drive a cutter rotor 11. Elevating means 16L, 16R for elevating and moving the cutter rotor 11, and depth detection means 61L, 61R for detecting the cutting depth by the cutter rotor 11, are provided. A controller 60 is also provided, so as to control the elevating means 16L, 16R in such a way that the cutting depth by the cutter rotor 11 becomes constant, based on the detection values of the depth detection means 61L, 61R. When the detection result by the load detection means 70 indicates an overload condition, the elevating means 16L, 16R are operated by the controller 60, so as to temporarily elevate the cutter rotor 11. After the overload condition is avoided, the cutter rotor 11 is returned to an initial height, and the cutting is resumed.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention provides control for a road cutter device applied to a road cutting mixer, etc. used when repairing a paved road surface by the road surface resurfacing method. It is related to the device.

"Conventional technology" Conventionally, when an existing asphalt pavement road surface is repaired using the road surface resurfacing method, an on-road cutting mixer is used. A waste road surface cutter device (rotary scarifier), ■ A hopper device that receives new mixed material input from a dump truck, etc., and ■ The loosened material scraped by the cutter device and the new mixed material in the hopper device. ■ A mixer device that mixes the loosened material transported by this feeder device and new composite material; ■ A screw that rotates the mixed material mixed by the mixer device to adjust the width of the road surface. It is a +ft truck equipped with a self-propelled vehicle equipped with a mixer spreading device that evenly sends out the mixed material onto the road surface while moving it in the same direction, and a leveling device that spreads and compacts the mixed material spread on the road surface.

A road cutter device applied to such a road cutting mixer (a large number of bits on the 141 side of a cylindrical drum b!
The cutter U7-Y is supported by the same rotor (E), and the cutter frame is provided at the elevation mark on the vehicle frame. It is composed of an 11-pressure motor that rotates the cutter rotor, etc., and by raising and lowering the cutter frame while simultaneously driving the cutter rotor, the depth of cut by the cutter rotor can be freely changed.
It can be adjusted. And cutter fly 14
is equipped with a cutter depth detector that detects the depth of cutting by the cutter rotor based on the distance between the cutter rotor and the road surface. Based on the detection signal output from this cutter depth detector, the hydraulic cylinder By operating the machine, the cutting depth of the paved road surface was always kept constant.

Problems to be solved by the invention Depending on the situation, the load on the hydraulic motor may suddenly increase and the cutter rotor may stop rotating. Conventionally, when the cutter rotor stops rotating due to an increase in load, a hydraulic cylinder is operated to temporarily lift the cutter rotor to avoid overload. However, since the operator must constantly visually monitor the rotation of the cutter rotor, there is a problem in that a great deal of labor is required. Therefore, the pressure of the hydraulic oil supplied to the hydraulic motor that rotates the cutter rotor is detected by a pressure sensor, and overload is determined based on the detection signal of this pressure sensor. There are also known systems that stop the running of the vehicle to avoid overloading. However, in the road surface regeneration method, which involves continuous construction, if the construction is interrupted due to vehicles stopping, the road surface cannot be regenerated uniformly and the quality of the paved road surface deteriorates. There was a problem.

This invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a control device that can be divided into a road force reduction device that can prevent overload caused by the condition of the paved road surface without interrupting construction. The purpose is

"Means for Solving the Problems" This invention provides a cutter rotor for cutting a paved road surface, a cutter drive means for driving the cutter rotor in the same rotation, a load detection means for detecting a load on the cutter drive means,
an elevating means for moving the cutter rotor up and down; a depth detecting means for detecting a cutting depth by the cutter rotor;
control means for controlling the operation of the elevating means so that the cutting depth by the cutter rotor is always constant based on the detection result of the depth detecting means; It is determined whether or not an overload condition has occurred based on the detection result, and if an overload condition has occurred, the lifting means is operated to temporarily raise the cutter rotor, and the overload condition is avoided. is the cutter a-
It is characterized by lowering the evening to its original height.

``Function'' According to the series of configurations, the load on the cutter drive means is detected by the load detection means, and when an overload condition occurs, the load on the cutter is temporarily raised, and when the overload condition is avoided, The cutter rotor is lowered to its original height.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, with reference to FIG. 2, the configuration of a road cutting mixer to which the control device for the road cutter device according to this embodiment is applied will be described. In FIG. 2, 1 is a leading self-propelled vehicle, and 2 is a following self-propelled vehicle. During pavement repair work, these two self-propelled vehicles 1.2, as shown in the figure, When vehicles are lined up vertically and always separated by a certain distance and travel at low speed in the direction of arrow F (forward), when they are loaded and unloaded from a transport trailer etc. and headed to a work site,
During transport, such as when returning from a work site to a transport trailer, each vehicle is designed to travel independently at high speed.

One part of the preceding self-propelled 1j car 1 has a hopper device 3 that receives new mixed material introduced by a dump truck or the like.
When the hopper device 3 is installed, a pair of left and right wings 4.4 are attached to the opening/closing port 11 facing upward, and the opening/closing angles of these wings 4.4 are expressed as p, l.
The structure is dominated by a hydraulic drive mechanism etc.

A feeder device 5 is installed at the center in the width direction of the self-propelled vehicle l and extends diagonally backward from below the hopper device 3.
The new composite material introduced into the tank is transported to the rear.

A pair of left and right front wheels 6.6 are attached to the vehicle frame below the hopper device 3 so as to be rotatable and swingable in a horizontal plane, and these front wheels 6.6 are mounted on the driver's seat. The direction is changed by a hydraulic drive mechanism that operates in response to the rotation of the handle 7, thereby changing the direction of travel.

A heating device 8 for preheating the existing asphalt pavement surface is supported on the vehicle frame behind the front wheels 6.6 so as to be able to rise and fall freely, and this heating device 81 is raised and lowered by a hydraulic cylinder 9. There is.

A road cutter device IO is provided on the vehicle frame behind the heating device 8 to cut and loosen the asphalt pavement surface that has been preheated by the heating device 8. This road cutter device 10 includes a cutter rotor 11, and a cutter frame 12 that rotatably supports the cutter 11.
The cutter rotor IT is rotatably driven by hydraulic motors 17L and 171t (see FIG. 1) directly connected to its rotating shaft, and the cutter frame 12 is supported by the vehicle frame so as to be movable up and down. The cutter frame 12 has left and right hydraulic cylinders 16L.

16R (see Fig. 1), so that the cutting depth by the cutter rotor IN can be adjusted by g and IJ.

On the vehicle frame behind the road cutter device IO, there is a
A pair of drive wheels 14.14 are each rotatably provided, and these drive wheels 14.14 are not shown in the drawings.
It is designed to be rotationally driven by a pressure motor and a rear wheel drive mechanism.

Furthermore, a transfer feeder device 18 is provided at the rear of the self-propelled vehicle 1 to receive and deliver the new mixed material transported by the feeder device 5 described above to the following self-propelled vehicle 2. This transfer feeder device 18 is configured such that the height of the discharge portion 18a at the rear end can be adjusted by an AIt pressure cylinder I9, so that the discharge portion 18a of the transfer feeder device 18 can be adjusted at the rear end during road surface repair work. It is located above the input chute 20 of the self-propelled vehicle 2.

On the other hand, at the front end of the following self-propelled vehicle 2, there is a extraction device 2 for pushing away the scraping material scraped by the road surface cutter device 10 of the preceding self-propelled vehicle 1 to the side of the road surface. and a pickup feeder 22 that scoops up the scraped material.
Or is provided.

The scraped material scooped up by the pick-up feeder 22 is conveyed diagonally rearward and upward within the casing 23 and is discharged from an opening formed at the rear end of the casing 23.

A casing 23 is located behind the pickup feeder 22.
A weighing feeder device 24 is provided for conveying the loosened material discharged from the opening in the rearward diagonal upward direction and for measuring the weight of the loosened material being conveyed. Above this weighing feeder device 24, a transfer feeder device 1 is provided.
A weighing feeder device 26 is provided for conveying the new mixed material discharged from the feeder 8 rearward and obliquely upward, and for measuring the weight of the new mixed material being transported.

The loosened material and new mixed material that have been conveyed by these weighing feeder devices 2426 are transferred to a mixer device 2 provided behind each weighing feeder device R24, 26.
It will be thrown in at 8. This mixer device 28 has a plurality of paddles protruding radially from two rotating shafts provided in a casing that extend in the longitudinal direction of the vehicle. Shoot 29
The Kakihogushisha and Shingen composite materials introduced into the casing are mixed by a paddle, and then this mixed material is discharged from a discharge port 4' formed at the rear of the casing.

A mixture spreading device 30 is installed behind the mixer device 28 to send out the mixed material discharged from the discharge port at the rear of the casing of the mixer device 28 onto the road surface.This mixture spreading device 301i , consists of a pair of left and right screws that extend in the width direction of the vehicle and are supported by the vehicle body frame in an upward and downward manner, and a drive mechanism that rotationally drives these screws.By rotationally driving these screws, the mixer device 28 The discharged mixed material is transferred in the width direction of the vehicle and sent out evenly onto the road surface. Behind this mixed material spreading device 30, the mixed material spread on the road surface is spread and compacted. Leveling device 31
is provided.

In addition, (i,
A pair of left and right drive wheels 34, 34 are each rotatably provided, and these drive wheels 34, 34 (rotationally driven by a hydraulic motor and a rear wheel drive mechanism, not shown above), and a pickup A pair of left and right front wheels 36.36 are attached to the vehicle frame behind the feeder 22 so as to be rotatable and pivotable in a horizontal plane, and these front wheels 36.36 are attached to the vehicle frame provided at the driver's seat. Ear 1 that operates according to the rotational operation of the handle 37
1t IX! It is curved so that its direction changes depending on the jh It structure.

Next, with reference to FIG. 1, the configuration of a control device in a road cutter device 10 according to an embodiment of the present invention will be described. In FIG. 1, 45 is a hydraulic pump driven by a diesel engine mounted on the preceding self-propelled vehicle 1, and sucks hydraulic oil stored in a hydraulic oil tank 46 through a suction pipe 47. The hydraulic fluid discharged from this hydraulic pump 45 is then connected to a relief valve 49 and a solenoid valve 50L via a pressure pipe 48.
, 501 and is led to the unload valve 51. The relief valve 49 operates when the pressure of the hydraulic oil discharged from the surface pressure pump 45 exceeds a predetermined pressure, and transfers the hydraulic oil discharged from the hydraulic pump 45 to the hydraulic oil tank 46 via the return pipe 52. It is meant to return to. The solenoid valve 50L selectively guides the hydraulic oil supplied via the pressure pipe 48 to the rod side or the head side of the hydraulic cylinder J6L. That is, solenoid valve 50I
When the solenoid 50La is turned on, hydraulic oil is guided to the rod side of the surface pressure cylinder 16 through the pipe 54L, thereby pulling the cylinder rod 1GLa upward. Along with this, the hydraulic cylinders 16 and 7 are
The hydraulic oil discharged from the throat side is returned to the solenoid valve 50L via the pipe 55L, and further returned to the hydraulic oil tank 46 via the return pipe 56. On the contrary, solenoid 5
When 0Lb is turned on, hydraulic oil is guided to the head side of the hydraulic cylinder 167 through the pipe 55L, thereby pushing the cylinder rod 16La downward.

Along with this, the hydraulic fluid discharged from the rod side of the hydraulic cylinder 16[7] is returned to the solenoid valve 50L via the piping 54L, and further via the return piping 56 to the operating oil 1i.
It is returned to lJ1 tank 46. Similarly, the solenoid valve 50 It is actuated via the pressure line 48 . II] is the hydraulic cylinder 16f? When the solenoid 50Ra of the solenoid valve 501z is turned on, the hydraulic oil flows through the piping 54R to the hydraulic cylinder 161.
When the cylinder rod 1611a is pulled upward and the solenoid 50Rb is turned on, the hydraulic oil flows into the pipe 55r? is guided to the head side of the surface pressure cylinder 16[z through the cylinder rod 16Ra
is pushed downward.

In the illustrated state, the unload valve 51 returns the hydraulic oil in the pressure pipe 48 to the hydraulic oil tank 46, leaving the pump 45 in an unloaded state. ! I, and when any one of the solenoids 50 La, 50 Lb, 50 Ra, and 50 Rb is turned on, the solenoid 51a is turned on in conjunction with this, and the hydraulic oil in the pressure pipe 48 is turned on. Leads to all mh#s solenoid valves 501.5OR.

- The operations of the solenoid valves 50L and 50R are each controlled by a controller 60. Controller [l-ra 60 is a CI that performs various calculations, etc.] U (central processing unit)
, rtoM (read-only memory) in which programs used in CI'LJ are stored, and nAM (random access memory) in which various data are stored.
and 31=1. Exchange data! 10 (human output) interface, and also each solenoid valve 50L, 50n each solenoid 50La according to instructions from the CPU.
, 50 lb, and 50 Ra 50 lb.

This controller 60 includes cutter depth detectors 61L and 6 provided at both left and right ends of the cutter frame 12, respectively.
Depth detection signals are supplied from 111, respectively. The cutter depth detectors 61L and 61R have swingable or extendable arms 62L and 62R whose tips come into contact with the road surface. It is composed of detection units 63L and 6311 that output a depth detection signal corresponding to the distance.

On the other hand, 65 is a hydraulic pump that supplies hydraulic oil to the hydraulic motors 17t, 1711 for rotationally driving the cutter rotor II. The hydraulic oil stored in the pipe 6
Inhale through 7. The hydraulic oil discharged from the hydraulic pump 65 is delivered to the relief valve 69, the pressure sensor 7o, and the hydraulic motor 17L via the pressure pipe 68.

The hydraulic oil discharged from these hydraulic motors 17L and 17R is returned to the hydraulic oil tank 46 via the return pipe 72. In addition, the discharge 11 from the extraction pump 65
When the actuation AJ+pressure exceeds a predetermined pressure, the relief valve 69 is actuated, and the actuation Ilb is returned to the return pipe 72.
The oil is returned to the hydraulic oil tank 46 via the hydraulic oil tank 46.

The operation of the control device in the road cutter device configured as described above will be explained with reference to the flowchart shown in FIG.

First, the controller 60 performs step SP1 shown in FIG.
At this point, it is determined whether the cutter rotor II should be raised or not based on the depth detection signals output from the cutter depth detectors 61L and 6IR.

That is, if the actual cutting depth is deeper than the preset cutting depth based on the depth detection signal, it is determined that the first cutter rotor should be raised, and the next step S is performed.
Proceed to P2. In this step SP2, the solenoid valve 50 is used to raise the cutter rotor 1N.
L, 501? Turn on the solenoids 50La and 50Ra. As a result, the hydraulic cylinders 16L, 1617
The cylinder rods 16La and 16Ra are pulled upward, and the cutter rotor 11 is pulled upward together with the cutter frame 12 and cutter depth detectors 61L and 61ft. Then, in the next step SP3, cutter [! - It is determined whether or not to end the elevating control of the motor I■, and if the elevating and lowering control is to be continued, the process returns to step s■)1.

In step SPI, the cutter depth detector 61L
, 61R, if it is determined that the cutter rotor 11 should not be raised based on the depth detection signal output from the
That is, if the actual cutting depth is approximately the same as or shallower than the preset cutting depth, the process proceeds to step SP4. In this step S f' 4 J, the surface pressure is determined based on the detection signal corresponding to the cutter drive hydraulic pressure (the pressure of the hydraulic oil supplied to the hydraulic motors 17L and +71) output from the pressure sensor 7o. Motor I7L,
The load on I 7 R is detected, and it is determined whether it is necessary to forcibly raise the cutter rotor 11 according to the state of this load. That is, as shown in FIG. 4, if the cutter drive hydraulic pressure at which the relief valve 69 operates is P3 (250 kg/cm'), then the controller 6
0 is cutter drive^11 pressure If the pressure is P, ~P,
This is considered to be a dangerous overload pressure and judged to be an area where the cutter needs to be raised.

If it is determined that the cutter needs to be raised in step S1]4 and it is necessary to forcibly raise the cutter rotor 11, the process proceeds to step SI'2, and if it is determined that there is no need to do so ( Proceed to step Sl)5. In this step SI'5, the cutter [J-ta 1
1. Determine whether it is possible to avoid descending. That is, as shown in FIG. 4, the cutter drive hydraulic pressure is r), ~
In the case of I), it is assumed that the pressure is appropriate and the cutter height is maintained as it is, and if the cutter drive hydraulic pressure is between 0 and P1, it is assumed that there is sufficient pressure and the cutter can be lowered. If it is determined that the cutter can be lowered (
The process proceeds to the next step 51)6, and if it is determined that the current cutter height is to be maintained, the process proceeds to step SP3.

In step SP6, the cutter depth detector 61
Based on the cutter depth detection signal output from L, 6111, it is determined whether or not the cutter rotor 11 should be lowered. That is, if the actual cutting depth is shallower than the preset cutting depth based on the cutter depth detection signal, it is determined that the cutter rotor 11 should be lowered, and the process proceeds to the next step 51) 7 to determine the actual cutting depth. If the cutting depth is substantially the same as the preset cutting depth, it is determined that the lowering should not be performed and the process proceeds to step 51)3. Step S above
l) In step 7, each solenoid 50Lb, 501b of each solenoid valve 5017.50n is turned on in order to lower the cutter rotor II.

As a result, the cylinder rods 16La and 1611a of the hydraulic cylinders 16L and 16R are pushed down, and the cutter rotor 11 is pushed down together with the cutter frame 12 and cutter depth detection 161L and 611N.

Then, in the next step SP3, the cutter a-11
It is determined whether or not to end the elevation control, and if the elevation control is to be continued, the process returns to step Sr'l.

The above operations can be summarized as shown in FIG. As is clear from this figure, when the load on the hydraulic motors I7L and I711 that rotationally drive the cutter rotor 11 increases rapidly and the cutter drive hydraulic pressure reaches a dangerous overload pressure, the cutter depth sensor 61L, Regardless of the output of 6+11, the cutter rotor 11 is forced to rise 0゛,
When the cutter drive hydraulic pressure has a margin, automatic control is performed to lower the forceputter rotor 11 to a predetermined depth.

"Effects of the Invention" As explained above, according to the present invention, the load force on the cutter drive means is detected by the load detection means, and when an overload condition occurs, the cutter rotor is temporarily raised to avoid the overload condition. Then, the cutter is lowered to its original height, making it possible to avoid overloads caused by the condition of the paved road surface without interrupting construction.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the electric and hydraulic circuits of a control device in a road cutter device according to an embodiment of the present invention, and FIG. 2 is a configuration of a road cutting mixer to which the road cutter device according to the embodiment is applied. 3 is a flowchart for explaining the operation of the road cutter device according to the same embodiment. FIG. 4 is a diagram showing the relationship between the operation of the road cutter device and the cutter drive hydraulic pressure according to the same embodiment. The figure is a diagram for explaining the operation of the road cutter device according to the same embodiment. II...Cutter rotor, 12...Cutter frame, 16L, 16R... Surface pressure cylinder (lifting means)
, 17L, 17R...hydraulic motor (cutter drive means), 60...controller (control means),
61L, 61R... Force t9 Depth detection 4 (depth detection stage f), 70... Pressure sensor (load detection means).

Claims (1)

[Claims] A cutter rotor that cuts a paved road surface, a cutter drive means that rotationally drives the cutter rotor, a load detection means that detects a load on the cutter drive means, an elevating means that moves the cutter rotor up and down, and a cutting depth that is determined by the cutter rotor. a depth detection means for detecting the depth; and a control means for controlling the operation of the lifting means so that the cutting depth by the cutter rotor is always constant based on the detection result of the depth detection means, and the control means The means determines whether or not an overload condition has occurred based on the detection result of the load detection means, and if an overload condition has occurred, operates the lifting means to temporarily raise the cutter rotor to prevent the overload. A control device for a road cutter device, characterized in that the cutter rotor is lowered to its original height when a load condition is avoided.