JPS5829387B2 - Kensetsuki Kaino Jido Leveling Souch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for automatically leveling a blade of a working machine such as a grader or an asphalt finisher.

When working with an asphalt finisher or motor grader, it is necessary to keep the height of these blades constant.

Conventionally, automatic leveling devices have been used for this purpose, but these devices set a certain reference level at the work site, such as a bar or a laser beam, and detect this level with a sensor attached to the blade. The height of the blade is controlled at a constant level by performing the work while maintaining the height of the blade.

If there is an obstacle in the working direction during work, the blade must avoid the obstacle, but this can be done by using the entire vehicle or by moving the blade sideways.

However, if this method is avoided, there is a risk that the pantograph that is in contact with the tension tension will come off the tension tension, and there is a drawback that the automatic leveling function will no longer function.

The present invention has been made to eliminate the above-mentioned drawbacks.
To provide an automatic leveling device which prevents a pantograph from coming off by adding a sensor for detecting a lateral distance from a tensioner to a vertical drive device of a level sensor and keeping this distance constant at all times. With the goal.

The present invention will be described below with reference to the drawings. Reference numeral 1 denotes a blade of a construction machine.A hydraulic cylinder 2 is attached to the blade 1 laterally as shown in the figure, and a level sensor 3 is attached to the tip of the piston of the cylinder 2. Vertical drive machine 4 that moves up and down
Attach.

Furthermore, a lateral position sensor 5 is attached to the tip of the piston via an arm 5a, and a pantograph 6 for lateral position detection is attached to the sensor.
Attach.

Similarly, a pantograph 8 is attached to the level sensor 3 via an arm 7.

These pantographs 6.8 have a function of transmitting changes in level and lateral position to each sensor as changes in rotational angle while sliding on a tensioner 9 for setting a reference level.

However, the rotation planes formed by the arm I of the sensor 3 and the pantograph 6 of the sensor 5 are in a relationship such that they are perpendicular to each other.

Further, as shown in the plan view in FIG. 2, the lateral position sensor 5
is attached to the bent arm 5a, so that the arm 7 and pantograph 8 of the level sensor 3 and the pantograph 6 of the sensor 5 do not interfere with each other.

A desired lateral position (corresponding to the rotation angle of the pantograph 6 of the lateral position sensor 5) is set in the lateral position setting device 10, and the output of the sensor 5 and the setting value of the setting device 10 are added to the mixer 13 to calculate the deviation. Amplifier 11. The sensor lateral drive hydraulic cylinder 2 is driven via the hydraulic drive device 12 in accordance with the deviation.

Now, if the construction machine is moving in the front direction as shown in Figure 1, if there is an obstacle in front of it, the entire construction machine will either turn around to avoid it or move the blade sideways to avoid it. do.

That is, the blade 1 moves to the right or left in FIG.

For example, if the blade moves to the right, the pantograph 8 of the level sensor 3 will also move to the right at the same time, and eventually the pantograph 8 will come off the tensioner 9 and lose its leveling function.

At this time, in order to prevent the pantograph 8 from coming off, the movement distance of the pantograph 8 may be compensated by the movement distance of the blade.

Movement of the blade 1 in the right direction rotates the pantograph 6 clockwise, so the lateral position sensor 5 generates an output proportional to the rotation angle.

The deviation between this output and the output of the lateral position setter 10 is determined by the amplifier 11.
The hydraulic drive device 12 is actuated via.

Since the hydraulic cylinder 2 operates to move the vertical drive unit 4 to the left, the pantograph 8 is compensated by the distance traveled by the blade 1.

If the blade 1 moves to the left, the pantograph 8 moves to the right in a similar manner to compensate.

As explained above, the present invention detects the amount of lateral movement of the level sensor pantograph and compensates for it, so stable automatic leveling can be performed without the risk of the pantograph coming off the tension. .

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG. 2 is a configuration diagram showing one embodiment of the present invention.
FIG. 1... Freight, 2... Hydraulic cylinder, 3... Level sensor, 4... Vertical drive machine, 5... Lateral position sensor, 6°8... Pantograph, 9... Ding tension .

Claims (1)

[Claims] 1. In an automatic leveling device that controls the height of a leveling work machine such as a blade by a level sensor pantograph provided in the leveling work machine while contacting the tensioning, a lateral position sensor that detects the amount of lateral movement of the leveling work machine; , a control device for moving the level sensor in a lateral direction opposite to the moving direction of the leveling work machine independently of the leveling work machine according to the detection output of the lateral position sensor, An automatic leveling device characterized in that the pantograph of the level sensor is always in contact with the tension regardless of lateral movement.