SU594435A1 - Device for investigating viscous-plastic materials under pressure - Google Patents

Description

(54) DEVICE FOR RESEARCH OF VISCOPLASTIC MATERIALS UNDER PRESSURE

The invention relates to devices for the fluid properties of fluid using rotating bodies and can be used in studies of visco-plastic materials, in particular, in the manufacture of rubber and rubbers.

A device for determining the rheological properties of polymeric materials is known, which comprises a mold with a pressing punch and a rotating shaft connected to the drive through an elastic element i. The measurement is carried out using an angular displacement sensor, the core of which is rigidly connected to the upper end of the elastic element, and the coil is mounted on a rotating from and (1 individual actuator base, which sends a signal through the amplifier to the drive shaft.

In this device, the moment of shear resistance of the material under study is also perceived by the elastic element n fixed by the angular displacement sensor. In addition, the device uses a trace n1a force compensation system. However, this device has a low accuracy of measuring the Cs for a bearing in a bearing centered by an elastic barrel with a glass, and provides only one work - moment-time.

Closest to the technical essence of the invention is a device for determining the plasticity and speed of curing of plastic masses, made according to the type of rotational viscometer, containing nptcc-shape with a pressing punch and pin connected with the elastic element of the device for perception axial force and shear resistance measurement, as well as the mechanism of rotation of the pin or mold against each other | 2.

At the same time, the tongue is equipped with a smooth pilipdric tip, which, when the sample is molded, is fitted into the appropriately sized punch cavity.

In this device, the moment of shear resistance of the material under study is sensed by an elastic rod and recorded by an angular displacement sensor.

This device operates in the same mode, measuring -: - and - moment-time, and a podsipnik enters the measuring ueiib, centering the other element with the output shaft of the wire, which 3 results in the measurement from the influence of friction in the pins .

11c. the invention is an increase in the accuracy of the SPII -: smsre1 and and expansion of the functional equipment of the instrument.

This is due to the fact that in the device, the contents of the frame, the mold, the rotor, is connected with the drive through a torsion gauge of the torque. a torsion bar sensor is inserted into the kinematic chain of the drive mechanism with an engine, a torsion bar measuring the torque torque is rigidly connected to the output shaft of the drive shaft with its lower base end and in place of this connection is provided with a braking device. In this case, the detachable link of the actuator is made in the form of a controlled clutch, for example, electromagnetic, and the brake device of the torsion is made in the form of controlled electro-magnetic zero couplings, one of which is connected directly with the base end of the torsoia, and the other with the base.

Such a design makes it possible to increase the accuracy and expand the functional capabilities of the device in the study of viscous-plastic materials under pressure (determination of viscosity and relaxation of the tension of the material under investigation).

The drawing shows a General view of the device.

A device for examining visco-plastic materials under pressure comprises a bed 1, a hydraulic press 2, a mold 3, a rotor 4 connected to a drive 5 via Topc.4fiH 6 from a torque meter 7 to a sensor 8 for an angular twisting of the torsion ends .

Drive 5 consists of engine 9, gearbox 0, clutch 1 and a worm gearbox 12. Torsion 6 is rigidly connected with the lower base of the end of the drive shaft 13 of the drive 5 and its upper end is connected through an insulating rack 14, nut 15, with a rotor 4.

The angle twist sensor consists of a housing 16 connected to the lower base end of the torsnon 6 and a core 17 fixed to its upper end.

The output shaft 13 of the actuator 5 is mounted in bearings 18 and is connected to a torus. Device 19, consisting of a semi-coupling 20, directly attached to the shaft 13, and a semi-coupling 21, associated with the bed 1. Sensor S angular twist is associated with a recording device 22.

The device works as follows. The mass under investigation is heated in the working gap between the press-form 3 and the rotor 4 with the HELP1 of the hydraulic press 2 and the output; 1lts activation of the drive 5 from the engine 9. From the drive shaft 13, rotation at a constant angular velocity is transmitted to torsion b, rack 14 and rotor 4.

The material under study undergoes shear and the rotor 4 experiences shear resistance. Topciioii 6 being the most sensitive

the element in this chain is twisted under the action of the applied moment and the sensor 8 of the angular twist; - produces a sipgal proportional to the viscosity of the test material, per reg; page;; a turning device 22. 5Cro ::: e viscosity measurement (moment-time)

The device can operate in the mode of measuring the stress relaxation of the studied material.

For this purpose, a braking device 19 is inserted, which provides a rigid coupling of the semi-couplings 20 and 21.

At the same time, the torsion bar 6, twisted at the viscosity of MepeiiHH and its primary material, its bottom base base remains in the same position relative to its upper end. One way: v} to eliminate the effect of the inertia of the drive 5, the occurrence of disengagement of the clutch I.

Thus, the measurement circuit is torsion 6, pillar 14, rotor 4 — for ikaets with the lower base end of torsion 6 with base 1. In this case, rotor 4. Under the action of stress relaxation of the material under study due to the elasticity of torsion 6 begins to unwind.

In a deformed sample, the process of stress reduction to an equilibrium state occurs. The angle twist sensor 8 appropriately changes the output signal and the register device 22 writes the stress relaxation curve.

Claims (3)

1. A device for examining in plastic materials under pressure, comprising a frame, a mold, a rotor, connected to a drive through a torsion torque measuring device with a torsion tip sensor, which is improved in order to Measuring and expanding functional capabilities, the kinematic-mathematical circuit: the coupling of the drive mechanism with the engine is inserted into the coupling unit, and the torsion from the torque gauge is rigidly connected to the output base. drive shaft and in Este this compound is provided tor.moznym device. 2. The device according to claim 1, characterized in that the detachable link of the actuator is made in the form controlled clutch, for example, electromagnetic. 3. The device according to claim 1, characterized in that the brake device of the torsion is made in the form of controllable electro-magnetic coupling halves, one of which is connected to the lower base end of the torsion, and the other to the bed. Sources of information taken into account in the examination: 1. Authors svipetepSTBO USSR L 361426, M.Kl.2 G 01 N II / 14, 1971. 2. USSR Author's Certificate No. 246150, M.C.2 G 01. P / 14, 1967.