초록 ▼

An apparatus for adjusting die clearance for an extruder producing a sheet in a die having an adjusting device for adjusting the die clearance between an upper die and a lower die, a measuring device for measuring thicknesses of the sheet at a plurality of positions in the direction of width on the

An apparatus for adjusting die clearance for an extruder producing a sheet in a die having an adjusting device for adjusting the die clearance between an upper die and a lower die, a measuring device for measuring thicknesses of the sheet at a plurality of positions in the direction of width on the sheet, a setting device for setting desirable thicknesses at the positions, an adjusting data producing device for producing data with respect to die displacement to be adjusted from the measured data and the desirable thicknesses, and control device for controlling the adjusting device in order that the die clearance coincides with the desirable thickness. Rough adjustment can be effected by tightening or loosening the bolts while fine adjustment is achieved by heating the bolts with an electrical heater disposed thereabout.

대표청구항 ▼

An apparatus for adjusting die clearance between an upper die and a lower die of an extruder for producing a sheet with a plurality of adjusting bolts extending between said upper and lower dies at separated locations across the width of said sheet for adjusting the clearance comprising: means for m

An apparatus for adjusting die clearance between an upper die and a lower die of an extruder for producing a sheet with a plurality of adjusting bolts extending between said upper and lower dies at separated locations across the width of said sheet for adjusting the clearance comprising: means for measuring the thickness of said sheet at said separated locations after said sheet has emerged from said extruder and producing a signal for each location indicating the measured thickness; means for calculating for each bolt from the signal of the associated location a desired bolt displacement ddddB=d(R)+dB(F); means mounted adjacent said bolts for receiving said rough bolt displacement signals ddddI,J defined as coefficient factors of simultaneous linear equations representing the relationships between each compensating incremental force value (D1, D2, D3 . . . Dn); comparing the measured thicknesses with the desirable thicknesses, thereby producing a difference signal (eI) by which the die clearance is to be adjusted through an adjusting member located at the position “I”; calculating each increment of forces (DI, D2, . . . Dn) acting on the backface of the die element by solving multiple simultaneous linear equation formed with said values of the difference (eI), the stored matrix data (fI,J) and said each increment of forces; determining the displacement quantity signal dI) to a compensation value expressed as DI/K; and applying said displacement quantity signal to means for applying a force to said adjusting members.