JPH0549850U - Blade interference prevention device for motor grader - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the blade from interfering with the scarifier, step and front wheels. [Structure] An ultrasonic transmitter / receiver blade 9 is provided near the step 13 of the rear frame 1, the lower end of the arm 11 for the drawbar 6 and the scarifier 10 and the upper end of the arm 11.
Install the controller facing the scarifier 10 respectively, and activate the warning buzzer when the time from transmission to reception of this ultrasonic transmitter / receiver is shorter than the set time,
The operator is informed that the distance between the blade 9 and drawbar 6 and the scarifier 10, step 13, and the front wheel 5 has become short, and the operation of the blade 9 and drawbar 6 is stopped to prevent interference.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device that prevents a blade of a motor grader from interfering with a scarifier or a vehicle body.

[0002]

[Prior Art]

 As shown in FIGS. 1 and 2, the motor grader includes a vehicle body 3 including a rear frame 1 and a long front frame 2. The rear frame 1 has rear wheels 4 and the front frame 2 has front ends. The front wheels 5 are attached to the front frame 2, and the drawbar 6 is attached to the front end of the front frame 2 so that the drawbar 6 can swing up and down. An arm 11 of a scarifier 10 is mounted on a cylinder 12 so as to be vertically swingable. A blade 9 is used for leveling work and a scaler 10 is used for excavation work.

[0003]

[Problems to be solved by the device]

 In such a motor grader, the working machine of the blade 9 and the scarifier 10 is mounted in a narrow space below the front frame 2, and the blade 9 swings vertically and swings vertically, so that the blade 9 is swung during the swinging operation. The front wheel 5, the step 13 and the scarifier 10 may interfere with each other, or the drawbar 6 may interfere with the scarifier 10 when the blade 9 is lowered and be damaged.

Therefore, an object of the present invention is to provide a blade interference prevention device for a motor grader that can solve the above-mentioned problems.

[0005]

[Means for Solving the Problems]

 The ultrasonic transmitter / receiver is attached to one of the blade interference part and the blade interference part facing the other, and a warning buzzer is activated when the time from transmission to reception of this ultrasonic transmitter / receiver becomes shorter than the set time. It is equipped with a controller that operates.

[0006]

[Work]

 A warning buzzer informs the operator that the distance between the interfering part of the blade and the part where the blade interferes is shortened, thereby stopping the operation of the blade and preventing the interference of the blade.

[0007]

【Example】

 As shown in FIG. 3, the drawbar 6 interferes with the scarifier 10 when the blade 9 is lowered if the height of the scarifier 10 is not set properly. Install facing each other. Also, when the blade 9 turns, it interferes with the scarifier 10 as shown in FIG. 4, interferes with the step 13 as shown in FIG. 5, and interferes with the front wheel 5 as shown in FIG. The acoustic wave transmitter / receiver 14 is attached to the lower end of the arm 11 of the scarifier 10, the rear frame 1, and the upper end of the arm 11 of the scarifier 10 so as to face the blade 9. As shown in FIG. 7, the ultrasonic transmitter / receiver 14 comprises an ultrasonic transmitter 15 and an ultrasonic receiver 16 until the transmitted ultrasonic wave is reflected by the blade 9, that is, the obstacle A, and received. Time is measured by the controller 17 such as a computer, and when the time becomes shorter than the set time, the controller 17 such as a computer activates the warning buzzer 18 to notify the operator that the blade 9 interferes with each part. The operation of the blade 9 is stopped to prevent interference. The ultrasonic transmitter / receiver 14 may be attached to the interference portion of the blade 9.

[0008]

[Effect of the device]

 When the distance between the interfering portion of the blade 9 and the portion interfering with the blade 9 becomes short, the warning buzzer 18 operates to notify the operator, so that the operator stops the rotation and vertical swing of the blade 9 and the blade 9 interferes with the interfering portion. It is possible to prevent interference with the vehicle.

[Brief description of drawings]

FIG. 1 is a front view of a motor grader.

FIG. 2 is a plan view of a motor grader.

FIG. 3 is a perspective view of an ultrasonic transmitter / receiver mounting portion.

FIG. 4 is a perspective view of an ultrasonic transmitter / receiver mounting portion.

FIG. 5 is a perspective view of an ultrasonic transmitter / receiver mounting portion.

FIG. 6 is a perspective view of an ultrasonic wave transmitter / receiver mounting portion.

FIG. 7 is an operation circuit diagram of a warning buzzer.

[Explanation of symbols]

1 ... rear frame, 2 ... front frame, 3 ... vehicle body, 4 ...
Rear wheel, 5 ... front wheel, 6 ... drawbar, 7 ... turning circle, 9
… Blade, 10… Scalifier, 11… Arm, 1
3 ... Step, 14 ... Ultrasonic transmitter / receiver, 15 ... Transmitter,
16 ... Receiver, 17 ... Controller, 18 ... Warning buzzer.

Claims (1)

[Scope of utility model registration request] 1. A vehicle body 3 comprising a rear frame 1 having rear wheels 4 mounted thereon and a front frame 2 having front wheels 5 mounted thereon, and a drawbar 6 having a blade 9 at a front end portion of the front frame 2 and a scarifier 10. In a motor grader equipped with an arm 11 provided so as to be swingable up and down, an ultrasonic transmitter / receiver 14 is attached to one of the portion that interferes with the blade 9 and the interference portion of the blade 9, facing the other,
A blade interference prevention device for a motor grader, comprising a controller 17 for activating a warning buzzer 18 when the time from transmission to reception of the ultrasonic transmitter / receiver 14 becomes shorter than a set time.