SU1608497A1 - Viscometer - Google Patents

Abstract

The invention relates to the measurement of the rheological properties of a polymer melt in the manufacture of chemical fibers and allows the automation of the process of measuring the viscosity of polycaproamide in a continuous polymerization apparatus. The viscometer contains a thermostat with an extrusion chamber, a plunger, a follow-up electric drive consisting of a stepper motor with a worm gear, a lead screw, a force sensor, a processor, an analog-digital converter, an information input panel, a printer, an information board, a switch for the stepper motor windings, converting a binary code into a number of pulses; a pulse generator; registers for storing information about the direction, magnitude and speed of movement of the plunger. The extrusion chamber is flow-through and dual-channel. In one of the channels there is a plunger having a gap between its outer surface and the surface of the channel, which allows the melt layers to shift as the plunger moves down and up. The viscometer is equipped with a movable chamber, inside which a hydraulic medium is placed inside the flexible sheath, which transmits forces from the spindle to the plunger rod and the force sensor, regardless of the direction of movement of the spindle. The measurement frequency is controlled with a pulse accumulator and a timer. 1 il.

Description

Evaluation refers to the determination of the rheological properties of polymers.

The purpose of the invention is to automate the process of measuring the viscosity of spreading polyamide during its polymerization.

The drawing shows a diagram of the viscometer.

The meter tester contains a thermostat 1 with an extrusion chamber 2, a plunger

3, spindle 4, plunger rod 5 3, movable chamber 6 with hydraulic medium, force sensor 7, worm gear 8 ,. stepper motor 9, processor 10, analog-to-digital converter 11, information input control panel .12, printer 13, information board 14, stepper motor winding switch 15, 9, register 16, binary-to-pulse converter 17, number of pulses the magnitude

moving the plunger 3, the register 16 storing information about the direction of movement of the plunger 3, the frequency-controlled generator 19, the register 20 storing information about the speed of the movement of the plunger, timer 21 and the adder 22 pulses.

A force sensor 7 is connected by an inlet to a movable chamber 6, which is located inside the chamber 23 connected to the rod 5 acting on the plunger 3 and through which the frame 24 acting mechanically on the moving hydrochamber connected mechanically to the lead screw 4. The output of the force sensor 7 is connected to analog-to-digital converter 11. The stepper motor 9 is connected to the input of the worm gearbox by its shaft, and the windings to the output of the switch 15, whose input is connected with the output of the register 16 for information about the direction of movement of the ranger, and the second input With the output of the converter 17 binary code in the number of pulses. The last information input is associated with the output of the register 18 for storing the information about the displacement of the piston, and the clock input with the output of the frequency-controlled clock pulse generator 19 whose input is associated with the code of the register 20 for storing the information about the speed of the impulse. Registers 16, 18 and 20 are connected by their input to the output of processor 10.

The viscometer operates as follows.

Polycaproamide melt after one of the orifices of the spinning nozzle of the injection pump enters the thermostatically controlled two-channel chamber, stabilizes in temperature, fills the channel with plunger 3 and passes through the free channel into the injection bath for cooling. Through the information input panel 12, the value of the force by which the plunger in the channel of the flow chamber 2 should move the melt layers is inserted into the memory of the processor 10.

The next system starts with a stepper motor. Lead screw

moving down through the frame 24, presses on the bellows filled with liquid, representing the flexible chamber 6. The bellows transmits the force through the bottom of the chamber 23 to the rod 5 and the plunger 3 rigidly connected to it

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ki transmits force to the strain gauge - force sensor 7.

From the output of the force sensor, the signal is fed to the input of the analog-digital converter 11, the information about the magnitude of the shear force, converted into digital form, is input into the processor 10. The processor 10 compares the magnitude of the specified shear force and actually calculates the proportional-integral-differential of the law of regulation, the adjustment parameters and sends the calculated information to three registers: register 16 for storing the information about the direction of movement of the plunger, register 18 for storing the information about the amount of movement of the plunger Pa, plunger speed information storage register 20. Information about the direction of movement of the plunger from the output of the register 16 is fed to the first input of the switch 15 of the windings of the stepper motor, which is used to change the direction of rotation of the shaft of the stepping motor 9 and, therefore, change the direction of movement of the plunger shifting the melt layers.

The second input of the switch 15 of the stepper motor windings from the binary code converter 17 receives a signal in the form of a burst of pulses, the number of pulses in the burst is given by a binary number recorded in the plunger displacement information storage register 18, as a result of which the stepper motor rotates by the number of steps corresponding to the number of pulses in a bundle.

The speed of rotation of the shaft of the stepper motor is determined by the pulse frequency inside the stack, which is set by the frequency controlled oscillator 19 according to the binary number recorded in the plunger speed information storage register 20.

With the passage of a specified number of steps of the stepper motor, i.e. . the number of pulses that characterize the plunger stroke, which sets adder 24, supplies a signal to timer 23, which turns off the stepping motor 9, changes its direction of rotation, holds the set

160849

| Time and then includes a new dist. The lead screw 4 goes up. Transmits the I force through the lower pushers, frames 24 to the bellows of the chamber 6, the lid of the chamber 23, the rod 5 and the plunger 3. The hydraulic signal of the chamber 6 is converted in the force sensor 7 into an electric one proportional to the shear force, and then the tracking system operates similarly to the above.

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the invention

A viscometer containing a thermostat with a cutting chamber, a plunger, a follow-up electric drive consisting of a stepper motor with a worm gearbox, a lead screw, a force sensor, a processor, an analog-to-digital converter, an information console. (AI, printer, information , step switch winding switch: 1gate, storage register information 1 about the direction of mixing; plunger;) a, converter of binary code to pulse pulse, register of information about movement size

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a plunger controlled by the frequency of the clock pulse generator; a registrar of storing information about the speed of the plunger movement, characterized in that, in order to automate measurements of the rheological properties of the polymer melt in the process of its polymerization, the extrusion chamber is filled with flow and two channels , in one of which there is a plunger having a gap between its outer surface and the surface of the channel, which allows the layers to shift as the plunger moves, and the plunger is connected by a rod freely passing through a lead screw, with a chamber inside of which is placed in a flexible hydromedia environment, transmitting forces from the lead screw to the rod and force sensor regardless of the target movement motion of the screw screw, between the binary code converter and the switch of the stepper motor windings, the measurement process is continuous, sequentially pulse adder and timer included.

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Claims (1)

Claim ten with sl from R si, pr ma: ta: DV1 qi w er Viscometer containing thermostat extrusion chamber, plunger, an electric drive, consisting of a stepper motor with a worm gear, spindle, sensor 15 ed ly, processor, analog-digital driver ,. Inforia Input Console, Printer, Informational Elo, Stepper Winding Switch | Rgatel, Storage Register; Information of Plunger Movement; Binary Code Converter; Number of Pulses; Displacement Information Registers; 20 25 the plunger, controlled by the frequency of the clock generator, re-. ·; the storage of information about the speed of the plunger movement, characterized in that, in order to automate measurements of the rheological properties of the polymer melt during polymerization, the extrusion chamber is made flow and two-channel, one of which has a plunger having a gap between its outer surface and the channel surface , providing a shift of the melt layers during the movement of the plunger, and the plunger is connected by a rod, freely passing through the lead screw, with a chamber, inside of which is placed in a flexible shell of hydraulic and transmitting force from the lead screw at the rod and a force sensor regardless of the direction of motion of the lead screw between the binary code converter in the number of pulses and the switch of the stepper motor windings measurement process is carried out continuously, sequentially enabled adder and the pulse timer.