JPS635000U - - Google Patents

Description

[Brief Description of the Drawings] Fig. 1 is a block diagram showing the details of the controller that forms the center of the present invention, Fig. 2 is a system diagram showing the configuration of the control system of the lifting device according to the present invention, Fig. 3 and Fourth
The figure is a front view showing a high lift loader to which the present invention is applied, FIG. 5 is a graph showing an example of a target value signal, FIGS. 6 and 7 are graphs showing time delay correction for the target value signal, and FIG. 8 is a graph showing an example of a target value signal. It is a graph showing the pattern of correction of the target value signal when the tracking characteristic is not good. 1... Vehicle body, 2... Auxiliary loader, 3... Loading platform arm, 5... Main loader, 6... Loading platform arm, 7A
, 7B...Hydraulic cylinder, 11A, 11B...Solenoid proportional valve, 12...Hydraulic pump, 13A, 13B
... Inclinometer, 14 ... Operation switch, 15 ... Controller, 16 ... Solenoid valve, 17A, 17B ... Encoder, 21 ... Input detection circuit, 22 ... Initial value setting circuit, 23 ... Linear signal Generation circuit, 24...
...Response detection circuit, 25... Addition/subtraction circuit, 26...
Limiter circuit, 27, 31... Servo amplifier, 2
8, 32... Solenoid proportional valve amplifier, 29, 33...
D/A converter, 30... tilt detection circuit.

Claims (1)

[Claims for Utility Model Registration] 1. A platform elevating device for a high-lift loader comprising at least two adjacent cargo platforms, a drive mechanism for vertically moving these platforms independently, and a drive means for operating the drive mechanism, comprising: A plurality of detectors are provided for each platform to detect the height position of the platform, and one of the outputs of these multiple detectors is used as a reference initial value, and the voltage increases over time when the platform rises, and when the platform descends. The present invention is characterized by comprising a controller that outputs a target value signal whose voltage decreases with time, and outputs a signal for operating the driving means based on the deviation between the target value signal and the output of the detector. A platform lifting device for high lift loaders. 2. The platform elevating device for a high-lift loader according to claim 1, wherein the detector is an inclinometer that detects the inclination of an arm in the drive mechanism. 3. The platform elevating device for a high-lift loader according to claim 1, wherein the detector is an encoder that detects the rotation of the rotation axis of the arm in the drive mechanism. 4. The platform elevating device for a high lift loader according to claim 1, wherein the platform is comprised of two platforms, a main loader and an auxiliary loader. 5. The high-lift loader according to claim 2 or 3 of the utility model registration, wherein the controller increases the voltage value of the target value signal by the amount of response delay when the platform is raised, and decreases it when the platform is lowered. Loading platform lifting device. 6. The controller performs a hold operation to stop the rise or fall of the target value signal when the deviation between the target value signal and the detector output signal, which is its response signal, exceeds a first predetermined value. A platform elevating device for a high-lift loader according to any one of claims 2, 3, and 5 of the utility model registration claim. 7. Claims 2, 3, and 5 of the utility model registration claim in which the controller stops the operation of the driving means when the deviation between the detector output signals exceeds a second predetermined value. , the platform elevating device for a high lift loader according to any one of Item 6. 8. The platform elevating device for a high lift loader according to any one of claims 1 to 7 of the registered utility model claim, wherein the driving means is a hydraulic cylinder.