JPH0336012U

JPH0336012U -

Info

Publication number: JPH0336012U
Application number: JP9478789U
Authority: JP
Priority date: 1989-08-11
Filing date: 1989-08-11
Publication date: 1991-04-09
Anticipated expiration: 2004-06-08
Also published as: JPH0621924Y2

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す回路図、第２
図は本考案の装置を取り付けたアスフアルトフイ
ニツシヤの斜視図、第３図はアスフアルトフイニ
ツシヤの施工状況を示す平面図、第４図ａ〜第４
図ｃは本考案の一実施例における信号処理回路と
警報器出力制御回路の出力信号を示すグラフ、第
５図は本考案の一実施例に使用する超音波センサ
の側面図、第６図は従来のアスフアルトフイニツ
シヤの側面図、第７図は同平面図である。１……スクリード装置、６……伸縮スクリード
、１１，１８……超音波センサ、１２……距離設
定器、１３……比較器、１４……デツドバンド設
定器、１５……制御デツドバンド回路、１６……
操作バルブ、１７……油圧シリンダ、１９……信
号処理回路、２１……伸び量計算回路、２２，２
３……リミツトスイツチ、２４……警報器出力制
御回路、２５……警報器、３０……信号処理装置
、３１……運転パネル。 Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a perspective view of an asphalt finisher equipped with the device of the present invention, Figure 3 is a plan view showing the construction status of the asphalt finisher, and Figures 4a to 4.
Figure c is a graph showing the output signals of the signal processing circuit and alarm output control circuit in one embodiment of the present invention, Figure 5 is a side view of the ultrasonic sensor used in one embodiment of the present invention, and Figure 6 is A side view of a conventional asphalt finisher, and FIG. 7 is a plan view thereof. DESCRIPTION OF SYMBOLS 1... Screed device, 6... Telescopic screed, 11, 18... Ultrasonic sensor, 12... Distance setting device, 13... Comparator, 14... Dead band setting device, 15... Control dead band circuit, 16... …
Operation valve, 17... Hydraulic cylinder, 19... Signal processing circuit, 21... Extension amount calculation circuit, 22, 2
3... Limit switch, 24... Alarm output control circuit, 25... Alarm, 30... Signal processing device, 31... Operation panel.

Claims

[Scope of Claim for Utility Model Registration] (1) A non-contact distance measuring sensor attached to the outside of the telescopic screed, and a comparator that compares the signal from the non-contact distance measuring sensor attached to the telescopic screed with the signal from the distance setting device. The output signal of the comparator is inputted to the upper and lower limit limiter connected to the external setting device which has set the upper and lower limit values through the control deadband circuit connected to the deadband setting device, and this output signal is sent to the telescopic screed. 1. An automatic pavement width control device for an asphalt finisher, comprising a valve control means for inputting an input to an operating valve of a telescopic cylinder provided in the asphalt finisher. (2) A non-contact distance measurement sensor attached to the outside of the telescoping screed, a non-contact distance measurement sensor mounted to the outside of the tractor, a signal from the non-contact distance measurement sensor mounted to the telescoping screed, and a signal from the distance setting device. The signals are compared with a comparator, and the output signal of the comparator is inputted to the upper and lower limit limiters connected to an external setter that has set the upper and lower limits via a control deadband circuit connected to a deadband setter, and this output signal is The signal and the signal obtained by processing the signal from the non-contact distance measurement sensor attached to the tractor with a signal processing circuit are input to an OR circuit, and this output signal is input to the operating valve of the telescopic cylinder provided on the telescopic screed. An automatic pavement width control device for an asphalt finisher, comprising a valve control means. (3) A non-contact distance measuring sensor installed on the outside of the telescopic screed, a non-contact distance measuring sensor installed on the outside of the tractor, and a pair of position detectors installed at both stroke limits of the telescopic cylinder provided on the telescopic screed. A comparator compares the signal from the non-contact distance measuring sensor attached to the telescopic screed with the signal from the distance setting device, and the output signal of the comparator is connected to the dead band setting device. Via the control deadband circuit, the output signal is input to the upper and lower limit limiters connected to an external setting device that has set the upper and lower limits, and this output signal and the signal from the non-contact distance measurement sensor attached to the tractor are processed by the signal processing circuit. Input the obtained signal and the signal processed by the OR circuit into the OR circuit,
a valve control means for inputting this output signal to an operating valve of a telescopic cylinder provided on the telescopic screed; and an extender connected to a non-contact distance measuring sensor attached to the telescopic screed and a non-contact distance measuring sensor attached to the tractor. Telescopic screed alarm means that inputs three output signals, an output signal from the quantity calculation circuit and an output signal from a pair of position detectors installed on the telescopic screed, to an alarm output control circuit, and inputs the output signals to the alarm. An automatic width control device for an asphalt finisher, characterized by comprising: