JPS58189402A - Apparatus for automatically controlling speed in road working vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic work speed control device for loading and unloading a cutting load in a road work machine such as a road cutter or stabilizer, and constantly maintaining a working speed corresponding to the load. .

To take an example of a conventional road work vehicle, when cutting the road surface, the work speed was usually adjusted manually by the operator according to the size of the work load, but in reality, the work speed was adjusted manually by the operator. It is convenient and often used to assume a large load value and set the working speed to a level that does not cause the drum to stop even in that case. However, even in places where the work load is small and cutting can be done easily, it is common to continue work at the same speed without increasing the work speed again, so the ability of road work vehicles such as road cutters is limited. There is a problem that it cannot be said that the work is carried out to the maximum extent, so it is desired to realize a device with good work efficiency.

The present invention was developed in view of the above, and aims to provide a device that always achieves the maximum working speed according to the cutting load within the capacity of the working vehicle. Detecting the cutting load of the cutter drum to achieve rounding, converting the detected value into a voltage change signal, and adjusting the voltage change signal to the oil discharge amount control signal of the traveling pump of the working vehicle. The present invention provides an automatic work speed control device for a work vehicle. The present invention will be described in detail below with reference to the drawings. In FIG. 1, reference numeral 1 denotes the main body of a road work vehicle, and a travel hydraulic motor 2 and a work travel hydraulic pump 3 are connected to drive the vehicle to travel. Reference numeral 4 indicates an electro-hydraulic servo pulp, which controls the output of the hydraulic pump 3 in response to an operation signal issued from the calculation processing section 5, as will be described later.

On the other hand, 6 indicates a cutter drum, which is rotated by a drum driving hydraulic motor 7 to cut the road surface.

The cutting depth can be set by moving the cutter drum up and down as shown by arrow A. Reference numeral 8 indicates a control station for work travel, and a control lever 9 for work travel.
Based on the operation, the arithmetic processing unit 5 is caused to receive an input signal. Reference numeral 10 denotes a nine-drum drive pressure needle led out from the drum drive hydraulic motor 7. In the case of this embodiment, in order to capture the cutting PA load of the cutter drum 6 as the driving pressure of the drum driving hydraulic motor 7, the signal line 12 is taken out from the derivation point 11 and inputted to the pressure-to-electrical converter 13. do. Furthermore, the output of the pressure-to-electrical converter 13 is input to a comparator 614 and compared with input No. 16 that corresponds to the desired drum drive pressure that has been manually input to the comparator 14 in advance, and the error signal 16 of both is sent to the arithmetic processing section 5. input. The arithmetic processing unit 5 serves as an input for driving the work vehicle! ! Addition/subtraction processing is performed on the four-run signal 16.

The operation signal, which is the output of the calculation unit 5, is applied to the electro-hydraulic thermistor valve of the work traveling pump and the electromagnetic proportional control unit 4.
The working speed is controlled by controlling the output of the working pump 3. In other words, when the cutting load becomes large, the work speed is reduced by that amount, and when the cutting load becomes small, the work speed is increased.
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Note that FIG. 2 shows a second embodiment of the present invention, and the same parts as those shown in FIG. 1 are designated by the same numbers. In this example, reference numeral 21 indicates a cutter drum tachometer, and the voltage generated by the generator 22 attached to the hydraulic motor for driving the drum is taken out as the signal line 12 from the derivation point 11, and the voltage is directly input to the comparison 614. do. The following operations are substantially the same as those shown in FIG. 1, and can achieve the same purpose.

Next, FIG. 3 shows a third embodiment of the present invention, in which the same parts are denoted by the same numbers as in the above. In this example, the cutting load, that is, the drum rotation speed, is detected by the pulses generated by the pulse oscillator 23 attached to the drum drive hydraulic motor 7, and the pulse change is converted into analog by the DAy converter 24, and the comparator 14.

The following operation is approximately the same as that shown in Figure 1, and the same purpose can be achieved.

FIG. 4 shows a fourth embodiment of the present invention. In this embodiment, the cutting load is detected by the voltage generated by the engine tachometer generator 25 provided on the main body side, and this is output from the MR. It is input to the comparator 14 via the signal line 12,
The following operations are the same as those explained in Figure @2.

Next, FIG. 5 shows a fifth embodiment of the present invention, in which the cutting load is detected by the pulses generated by a pulse oscillator 26 provided on the main body side and used for the engine rotating elbow. 1) The pulse is converted into analog by the A converter 24 and input to the converter 14 manually. The following operations are the same as those explained in FIG.

Figure 6 shows a sixth embodiment of the present invention, in which the inclination of the swash plate 28 of the drum drive hydraulic pump 27 that rotationally drives the cutter drum 6 is detected, the cutting load is detected based on the angle, and the cutting load is detected. The signal is converted into voltage by an angle to voltage converter 29 and input to the ratio converter 14. The following operations are substantially the same as those shown in FIG. 3, and can achieve the same purpose.

As explained in detail above, according to the present invention, the cutter, stabilizer, etc.
] By detecting the load and feeding the signal back to the work speed control device, the work speed of the shrimp is always maintained according to the load, which is possible within the capacity of the work vehicle, and the work speed is adjusted according to changes in the cutting load. Since the working speed can be automatically controlled according to the operating speed, it is possible to perform selective automatic control without depending on the operator's control of the working speed, which has the advantage of greatly improving work efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 41 is a schematic diagram of an apparatus 1/ for explaining the WJ1 embodiment of the present invention. Figure 2 is a schematic diagram of a device showing a second embodiment of the present invention. FIG. 3 is a schematic diagram of the equipment showing the third embodiment of the present invention, and FIG.
The figure is a schematic diagram of an apparatus showing a fourth embodiment of the present invention. Figure 5g5 shows the device g factor and the sixth embodiment showing the fifth embodiment of the present invention.
The figure shows a sixth embodiment of the present invention and is a schematic diagram of the device. 1. Road work vehicle main body, 2. Hydraulic motor for travel,
3... Hydraulic pump for working travel, 4... Electro-hydraulic servo pulp, 6... Cutter drum, 7... Hydraulic motor for driving drum, 8... Control station for working traveling, 9 ...Operation lever, 10...Tram drive pressure needle % 21...Cutter drum rotation needle, 22...@
Electricity, machine, 23... Pulse oscillator % 25... Generator for engine tachometer, 26... Pulse oscillator % 27.
...Drum drive hydraulic pump, 28...Swash plate, 29.
...Angle-voltage converter patent applicant Michi Isono, agent of Sakai Heavy Industries Co., Ltd., 4>, 1-,
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Claims (1)

[Scope of Claims] (1) An automatic work speed control device for the voltage utility vehicle, which detects a cutting load on a cutter drum and converts a cough detection value as a voltage change signal. (2) The cutting load is determined by detecting the drive pressure of the hydraulic motor for driving the cutter drum. ? An automatic work speed control device for road work according to claim (1), which refers to mold. (3) The cutting load is determined by detecting the voltage generated by the generator for the cutter drum tachometer.
) Automatic work speed control device for the road work vehicle described in item 2. (4) The automatic working speed control device for a road working vehicle as set forth in claim (1), wherein the cutting load is determined by detecting pulses generated by a pulse oscillator for rotation of the cutter drum. (6) The cutting load is determined by detecting the voltage generated by the engine tachometer generator.
) Automatic work speed 1tlI control device for the road work vehicle shown horizontally. (6) The automatic working speed control device for a road working vehicle as set forth in claim M(1), wherein the cutting load is determined by detecting pulses generated by a pulse oscillator for a two-wheel rotating needle. (7) The cutting load is determined by detecting the angle of the swash plate of a drum driving hydraulic pump that rotationally drives the cutter drum. Automatic work speed control in the road working vehicle according to claim (1). Device.