JPH0316442B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a cutting machine, and particularly to a cutting machine that automatically performs a lowering operation at the start of cutting and an upper cutting operation at the end of cutting, when cutting a paved road. Regarding machines.

[Technical background of the invention and its problems] Generally, when a paved road is repaired, broken and uneven parts of the road are cut using a cutting machine. This cutting is usually done at night, and the cut road surface is made passable during the day. In this case, when the cutting machine is evacuated from the construction site and when general vehicles are passing through, the construction road surface is made flat and sloped so that there are no steps, thereby reducing the number of running shocks. Conventionally, when attempting to form such an inclined cutting surface using a cutting machine, for example, the cutter blade of the cutting machine was manually lowered to a predetermined cutting depth, and then the cutting machine was run on a paved road. Either he would run the cutting machine slowly, or he would lower the cutter blade of the cutting machine little by little manually.

However, in the former case, the cutter blade is suddenly cut down to a predetermined cutting depth at the same time as cutting starts, which puts strain on the cutter blade, which is undesirable from the viewpoint of its lifespan. Moreover, when the cutter blade is subsequently moved as the cutting machine runs, there is a problem in that a step is likely to form on the cut portion of the paved road.

In the latter case, the balance between cutting depth and cutting distance is adjusted by manually operating the cutter blade, and it is extremely difficult to ensure a good balance. Therefore, the finish of the cut portion is usually poor, and it is almost impossible to cut according to the specified cutting slope.

Further, when using these conventional methods to cut the cutter blade up to the surface of a paved road to complete the work, the same problem occurs in the cutting operation described above.

[Object of the Invention] This invention has been made in view of the above problems, and its purpose is to adjust the lower cutting operation at the start of cutting and the upper cutting operation at the end of cutting to a preset depth of cut. To provide a cutting machine capable of automatically performing cutting according to a set cutting slope without putting stress on a cutter blade, without forming a step, with a good finished surface.

[Summary of the Invention] In order to achieve the above object, the cutting machine of the present invention provides a cutting machine that emits a distance signal proportional to the distance traveled from the cutting start point every time the cutting means is moved along the surface to be cut. a signal generating means; a cutting signal outputting means for converting the emitted distance signal into a cutting signal having a size corresponding to a designated cutting slope; and a cutting depth to the surface to be cut by the cutting means. or a depth setting means for setting an upper depth of cut, and a depth setting means for driving the cutting means in response to the cutting signal until the set lower depth of cut or upper depth of cut is reached; It is characterized by comprising a drive control means for canceling the drive state based on the cutting signal when the lower depth or the upper cutting depth is reached.

[Description of Embodiments] FIG. 1 is a block diagram showing a schematic configuration of a cutting machine of the present invention. In the figure, reference numeral 1 denotes a cutting means, and each time the cutting means 1 is moved across the surface to be cut, the distance signal generating means 3 generates a distance signal proportional to the distance traveled from the cutting start point.

Then, the cutting signal output means 5 converts the emitted distance signal into a cutting signal having a magnitude corresponding to the specified cutting slope and outputs the signal.

On the other hand, in the depth setting means 7, the depth of cutting or the depth of cutting into the paved road by the cutting means 1 is set.

When the cut signal of the cut signal output means 5 and the setting signal of the depth setting means 7 obtained in this way are applied to the drive control means 9, the drive control means 9 determines the set lower depth of cut or upper cut depth. Until you reach the depth
In response to the cutting signal, when the cutting means 1 reaches a set lower cutting depth or upper cutting depth, the driving state of the cutting means 1 by the cutting signal is released.

FIG. 2 is a block diagram showing the circuit configuration of a cutting machine to which the present invention is applied.

In the figure, 11 is a distance signal generation circuit (see Figure 3);
13 is a cutting slope setting device, 15 is a depth setting device, 16
is a cutting switch, 17 is a differential circuit, 19 is a depth sensor, 21 is a first addition circuit, 23 is a second addition circuit, 25 is a first switch, 27 is a second switch,
29 is a third switch, 31 is a voltage holding capacitor, 33 is a buffer amplifier, 35 is a drive circuit, 37 is a hydraulic cylinder, 39 is a cutter blade, 41 is an amplifier, 43 is a first comparator, 45 is a second comparator vessel,
47 is a first NAND gate, 49 is a second NAND gate, 51 is a cut-up display, 53 is a cut-down display, and 55
is an overgate, and 57 is an inverter.

The cutting machine to which this invention is applied is, for example, as shown in FIG. 4, a cutting machine 59 that is used while running on a paved road 61, and is equipped with the circuit configuration shown in FIG. It is.

The operation of the cutting machine to which this invention is applied includes the first
There are two types of cutting operations: an automatic cutting operation as explained based on the figures, and a manual cutting operation without such automatic cutting.

First, in the case of manual cutting operation, the distance signal generating circuit 11 is not used, and therefore the cutting switch 16 is held in a neutral state. Note that when the cutting switch 16 is in a neutral state, the first switch 25 is always in a non-conducting state, the second switch 27 is in a non-conducting state, and the third switch 25 is always in a non-conducting state.
Switch 29 is in a conductive state.

Therefore, the output signal H of the depth setter 15, which can be set appropriately by the operator of the cutting machine, is directly transmitted to the buffer amplifier 33 via the third switch 29.
It appears as the input side potential F. Therefore, the output signal B of the buffer amplifier 33 has a magnitude corresponding to the potential F and is applied to the first adder 21.

On the other hand, the detection signal A of the depth sensor 19 is also applied to the first adder 21 , and the output side potential of the first adder 21 is calculated as an error signal R by A-B=R, and is applied to the drive circuit 35 .

Then, a drive signal S corresponding to the error signal R appears in the drive circuit 35, and this drive signal S drives the hydraulic cylinder 37, causing the cutter blade 39 to move up and down.

On the other hand, in the case of automatic cutting operation, a distance signal is emitted from the distance signal generation circuit 11, and this emitted distance signal can be applied to the cutting slope setting device 13 by operating the cutting switch 16. Required.

For example, as shown in FIG. 3, the distance signal generation circuit 11 generates a signal from the speed/distance sensor 65 when the speed/distance sensor (rotary encoder) 65 is rotated by a wheel 63 of a cutting machine or a transmission (not shown).
generates a pulse signal. This pulse signal becomes a pulse signal per unit distance in a frequency dividing circuit 67, and is added to a binary counter 69 for counting. The count output from this binary counter 69 is converted into an analog value by a DA converter 71. Therefore, the analog value becomes a distance signal proportional to the moving distance l from the cutting start point P (see FIG. 4). Then, this distance signal is bypassed, and for example, on one side of the bypass, a phase inverter 73 outputs a distance signal for rounding up (hereinafter referred to as a rounding up signal), and on the other hand, the distance signal is used as it is to output a distance signal for rounding down. It is output as a signal (hereinafter referred to as a cut signal).

In this embodiment, the signal from the speed/distance sensor 65 is converted into a voltage value by the F-V converter 75, and the change in the magnitude of this voltage value is displayed as the speed by the speedometer 77. .

In this way, the distance signals (lower cut signal and upper cut signal) generated from the distance signal generation circuit 11 are switched in response to selection of the lower cut movement or the upper cut operation by the cut switch 16. Gradient setting device 13
join.

In the cutting slope setting device 13, the cutter blade 3
9 is set for a certain distance on the paved road, the slope of the cut-down or cut-up is set, so when the cut-down signal or the cut-up signal is added, these signals are set. It can be converted into a lower cut signal or an upper cut signal having a magnitude corresponding to the cutting slope.

Moreover, when advancing the cut, the depth setter 15 can be used to set how deep the cut should be made.

Then, the cutting slope setting device 13 and the depth setting device 1
In response to each of the settings of 5, as will be described later, the cutting machine to which the present invention is applied will proceed with automatic cutting processing in the drive control means downstream of the setting device.

Next, with reference to FIG.
Based on the figure, the cutting-down motion and the cutting-up motion will be explained separately.

(1) Cutting down operation Now, we will describe the case where the cutter blade 39 is cut down by 150 mm while the cutter blade 39 is advanced by 1.5 m, assuming that the cutting distance is 1.5 m and the cutting slope is 10%.

In this case, after placing the cutting machine 59 at a predetermined position on the paved road 61, first, the depth setting device 15 is set to 0 mm (0V), and the cutting depth switch 16 is turned to the lower cutting side. Then, one input side potential M of the differentiating circuit 17 becomes Hi due to the power supply voltage, and the rising of this potential M is detected by the differentiating circuit 17 and a pulse I is generated. This pulse I causes the amplifier 41 to generate a reset signal. This reset signal resets the frequency divider circuit 67 and binary counter 69 in FIG. 3, so that the cut-down signal becomes 0V.

At the same time, the second switch 27 becomes conductive for a moment due to the pulse I, so that the potential H=0 (V) of the depth setter 15 is held as the potential G of the voltage holding capacitor 31.

In this way, the potentials C and D on the input and output sides of the cutting gradient setting device 13 are 0 (V), and the potential G of the voltage holding capacitor 31 is 0 (V).
Therefore, the output signal E of the second addition circuit 23
becomes 0 (V) due to the relationship E-G-D=0 (V).

Next, set the depth setting device 15 to the desired cutting depth of 150 mm.
Set to mm (1.5V). By this,
Since the output signal H of the depth setter 15 is 1.5 (V), the second comparator 45 initially receives the output signal H = 1.5 (V) of the depth setter 15 on the positive input side, and It receives the output signal E=0 (V) of the second adder circuit 23 on its input side. Therefore, the second comparator 45
The output signal 0 becomes Hi, and the NAND gate 49
Since the output side potential Q becomes _L0 , the lower cutting indicator 53 is lit to indicate the lower cutting operation. At the same time, the output signal K of the OVER circuit 55 becomes Hi, and the first switch 25 becomes conductive.
Also, since the output signal is Hi, the inverter 57
The output signal J becomes _L0 , and the third switch 2
9 becomes non-conductive. Therefore, switch 25
The output side potential F and the output signal E of the second addition circuit 23 become E=F, and the output signal B of the buffer amplifier 33 becomes B=0 (V) at the beginning of the cut-down.

In this state, when the cutting machine 61 starts the cutting operation and moves forward, the lower cutting signal becomes 0.
(V) gradually increases in the negative direction, 1.5m
When moving forward, the relationship between potential C, potential D, potential E, and potential G is as follows: C = D = -1.5 (V) Also, E = G - D = 0 - (-1.5) = +1.5 (V) becomes.

Therefore, the output signal B of the buffer amplifier 33 gradually increases from the initial 0 (V) to 1.5V.

On the other hand, the depth sensor 19 detects the cutting depth near the cutter blade 39, and this detection signal A is applied to the first adder 21.
While the first adder 21 generates the error signal R calculated from the detection signal A and the output signal B, the drive circuit 35 sends a drive signal S for cutting down.
As a result, the hydraulic cylinder 37 is operated, and the cutter blade 39 is moved downward.

As described above, when the cutter blade 39 is moving downward and the output side potential E of the second addition circuit 23 becomes E>1.5 (V), the second comparator 4
The output signal 0 of the second NAND gate 49 becomes _L0 , the subsequent output signal Q of the second NAND gate 49 becomes Hi, the lower cutting indicator 53 turns off, and the completion of the lowering operation is notified.

At the same time, the output signal K of the OWA gate 55 is
Since it becomes L ₀ , the first switch 25 is restored to a non-conductive state. Also, since the output signal J of the subsequent inverter 57 becomes Hi, the third switch 29
is restored to conductive state.

Therefore, at the same time as the cutting operation is completed, the setting device 15
The output signal H of is the input side potential F of the buffer amplifier 33.
Therefore, the output signal B of the buffer amplifier 33 has a magnitude corresponding to the potential F, and the output signal B of the buffer amplifier 33 has a magnitude corresponding to the potential F.
Join 1. At this time, automatic cutting is canceled and the operation corresponds to manual operation.

After the cutting operation is completed in this way,
It is preferable to return the cut switch 16 to the neutral position.

In addition, after the completion of the cutting operation, the cutting operation is performed manually, and if the cutting machine 61 is moved forward with the depth setter 15 set to 1.5 (V), the cutting depth will be 150 mm. You can proceed (see Figure 4).

(2) Up-cutting operation After the above-mentioned down-cutting operation is completed, cut the cutting distance.
When performing up-cutting operation with a cutting depth of 1.5 m and a cutting slope of 10%, first set the depth setting device 15 to 150 mm.
(1.5V) and while still warm, turn the cut switch 16 to the upper side. Then, the other input side potential L of the differentiating circuit 17 becomes Hi due to the power supply voltage, and the rise of this potential L is detected by the differentiating circuit 17 and becomes a pulse I. This pulse I causes the division shown in FIG. Cycle circuit 67 and binary counter 69 are reset. At the same time, the second switch 27 becomes conductive for a moment due to the pulse I, so that the potential G of the voltage holding capacitor 31 becomes 1.5V, which is the potential H.

Therefore, the relationship between potentials C, D, E, and G is as follows: C=D=0 (V), and E=G−D=1.5−0=1.5(V).

Next, set the depth setter 15 to the desired cutting depth.
Set to mm (0V). As a result, the output signal H of the depth setter 15 becomes 0 (V), so initially, in the first comparator 43, the output signal H of the depth setter 15 is 0 ( V),
On the positive input side, the output signal E= of the second adder circuit 23
Receives 1.5 (V). Therefore, the output signal N of the first comparator 43 becomes Hi, and the output side potential P of the NAND gate 47 becomes _L0 , so the round-up indicator 5
1 lights up to indicate the cut-up operation. At the same time, the output signal K of the OVER gate 55 becomes Hi, the first switch 25 becomes conductive, and since the potential K is Hi, the output potential J of the inverter 57 becomes _L0 , and the third switch 29 becomes conductive. It becomes a non-conducting state. Therefore, the potential E and the potential F become E=F, and the output signal B of the buffer amplifier 33 becomes B=1.5 (V) at the beginning of rounding.

In this state, when the cutting machine 61 starts the cutting operation and moves forward, the upper cutting signal becomes 0.
When it gradually increases in the positive direction from (V) and advances by 1.5m, the relationship between potential C, potential D, potential E, and potential G is as follows: C=D>1.5(V) Also, E=G-D =1.5 −D <0.

Therefore, the output B of the buffer amplifier 33 is the original
It gradually decreases from 1.5 (V) to 0V.

As a result, while the error signal R calculated from the detection signal A of the depth sensor 19 and the buffer amplifier B is generated in the first adder 21, the cutter blade 39 moves upward.

As described above, when the cutter blade 39 is moving upward, if the output side potential E of the second addition circuit 23 becomes E<0 (V), the first comparator 4
The output side potential N of the first NAND gate 49 becomes _L0 , and the output side potential P of the first NAND gate 49 becomes Hi.
The completion of the cut-up operation is notified when the cut-up display 51 lights up and goes out.

At the same time, the output side potential K of the OVER gate 55
becomes _L0 , the first switch 25 is restored to a non-conductive state, and the third switch 29 is restored to a conductive state.

Therefore, at the same time as the cutting-up operation is completed, the automatic cutting is canceled and the operation corresponds to the manual operation. At this time as well, it is advisable to return the cutting switch 16 to the neutral position.

In this way, in this embodiment, when moving the cutting machine placed at a predetermined position on a paved road, the cutting slope and cutting depth can be set and the cutting depth can be adjusted by simply operating the cutting switch. By adjusting the relationship well with the cutting distance, the lower cutting operation at the start of cutting and the upper cutting operation at the end of cutting can be performed automatically. During this period, the cutting operation can be performed manually.

In the embodiment, a cutter blade operated by a hydraulic cylinder is used as the cutting means, but for example, a water injection type cutting means can also be used.

[Effects of the Invention] As described above, the cutting machine of the present invention emits a distance signal proportional to the moving distance from the cutting start point every time the cutting means is moved, and converts the emitted distance signal into a designated distance signal. The cut slope is converted into a cutting signal with a magnitude corresponding to the cutting slope, and the cutting means advances the cutting down operation or cutting up operation in response to this cutting depth signal, and each of these operations is performed according to the cutting angle set by the setting means. Since the cutting is performed until the cutting depth reaches the bottom or top of the cut, a good balance between cutting depth and cutting distance can be maintained at all times, and as a result, the cut part of the cut surface is kept clean. There are advantages such as:

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of the present invention, FIG. 2 is a block diagram showing a circuit configuration of a cutting machine to which this invention is applied, and FIG. 3 is a block diagram showing a circuit configuration of a distance signal generating circuit. FIG. 4 is an explanatory diagram of the use of a cutting machine to which the present invention is applied. 1...Cutting means, 3...Distance signal generation means, 5
... Cutting signal output means, 7 ... Depth setting means, 9
...Drive control means.

Claims (1)

[Claims] 1. Distance signal generating means for emitting a distance signal proportional to the moving distance from a cutting start point each time the cutting means is moved along the surface to be cut; and specifying the emitted distance signal. a cutting signal output means for converting into a cutting signal having a magnitude corresponding to the cutting slope, and a depth setting means for setting a lower depth of cut or an upper depth of cut to the surface to be cut by the cutting means; , The cutting means is driven in response to the front cutting signal until the set depth of cut or top depth of cut is reached, and when the set bottom depth of cut or top depth of cut is reached, the cutting means is driven. and a drive control means for releasing the drive state of the cutting means based on the cutting signal.