RU2244287C1 - Device for study of flow of material at complex shift - Google Patents

Abstract

FIELD: study of behavior of extrudate in compression locks and cavities of leakage of single-screw presses.

SUBSTANCE: proposed device includes bearing support on which cylindrical base with fixed die is mounted; strain gages bonded on said die are used for measurement of torque and axial forces; device is also provided with compression chamber which is brought in tight contact with die, cylindrical base and plunger; device has rod with changeable piston of varying length and diameter; rod with piston is mounted for rotation relative to fixed die at variable angular velocity by means of electric motor.

EFFECT: extended field of application; reduced measurement errors.

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Description

The invention relates to the field of technology for extruding biopolymers and is intended to study the behavior of the extrudate in compression closures and leak cavities of single-screw presses.

A device is known for studying the rheological properties of a material in a die model [RF patent No. 2157321, 10.10.2000], comprising a cylindrical base with a large tensometric ring installed in it, a support with a small tensometric ring mounted on it, on which a die with strain gauge sensors, a compression chamber formed by a cylinder having tight contact with the die, support and plunger, the plunger is equipped with a rod with a replaceable piston of different lengths and diameters.

Using this device does not allow to study the flow of material with a complex shear.

The technical result is the ability to study the flow regimes of a material with a complex shear, simulating the flow in compression gates and leak cavities and, therefore, expanding the capabilities and scope of this device, as well as reducing the error of the result obtained in the study.

The claimed technical result is achieved in that in a device for studying the flow of a material with a complex shear, including a bearing support, on which a cylindrical base is mounted with a die installed on it, on which strain gauges are glued, a compression chamber that has tight contact with the die, the cylindrical base and plunger, rod with interchangeable piston, which can be

made of different lengths and diameters, rotates relative to the stationary die with variable angular velocity by means of a drive using an electric motor, and strain gauges for measuring torque and axial forces are glued directly to the stationary die.

Figure 1 shows a longitudinal section of a device for studying the flow of material under conditions of complex shear, figure 2 shows a view - a through window of the device.

The device includes a bearing support 1, in which a rod 2 is installed with a replaceable piston 3, which can be made of different lengths and diameters, and on which a fixed fixed assembly is mounted motionless, consisting of a die 4, on which two sets of load cells are glued, one at an angle of 45 ° to the axis of the die for measuring torque, another for measuring axial forces, a compression chamber 5, the base of a cylindrical 6 having a through hole 7, a plunger 8, a cone 9, an electric motor 10, which through the actuator 11 rotates the rod 2 with the angular velocity relative to the die 4, and the frame 12, on which the entire device is installed.

The operation of the device is as follows. The studied material is placed in a compression chamber 5, sealed with a plunger 8 on a press designed to test the mechanical properties of materials, and extruded in the die channel 4, while at the same time, the rod 2 is rotated with a replaceable piston 3 with a given angular velocity using an electric motor 10 by means of a drive 11. At the same time, the device remains stationary, because it is fixed to the frame 12.

During the test, the waste is removed through the through window 7 in the cylindrical base 6 of the device.

The difference in axial forces and torque in the walls of the die 4 before and after the replaceable piston 3 determines the resistance to movement of the layer that flows around the replaceable piston 3.

By replacing the replaceable piston 3 with a larger or smaller diameter and a different length, it is possible to change the thickness of the layer of the material under study. To replace the replaceable piston 3, the non-separable assembly is removed from the bearing support.

The direct stroke of the plunger occurs as a result of loading the device on a press designed to test the mechanical properties of materials.

The use of the claimed device allows to increase the convenience in manufacturing and accuracy during operation when modeling processes occurring in compression closures and leak cavities in single-screw presses for polymer processing, when measuring the torque and stresses arising in compression closures and cavities simulating leak cavities, as well as and when measuring the viscosity of a material extruded under complex shear conditions.

Claims (1)

A device for studying the flow of material with a complex shear, including a bearing support, on which a cylindrical base is mounted with a die installed on it, on which strain gauges are glued, a compression chamber that has tight contact with the die, cylindrical base and plunger, a rod with a replaceable piston, which can be made of different lengths and diameters, characterized in that the rod with a replaceable piston is mounted with the possibility of rotation of the rod with a replaceable piston relative to a fixed die with variable Glov speed by using a drive motor and strain gauges for measuring torque and axial forces are glued directly to the fixed die.

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