Search

CN-122016364-A - Stability test equipment is extruded to screw extruder

CN122016364ACN 122016364 ACN122016364 ACN 122016364ACN-122016364-A

Abstract

The invention discloses extrusion stability testing equipment of a screw extruder, which belongs to the technical field of extruder testing equipment and comprises a testing machine barrel section, wherein a flow guide block and a melt pressure sensor are respectively arranged at the top and the side wall of the testing machine barrel section, a testing substrate is arranged on the flow guide block, a compensation corrugated pipe is arranged on the testing substrate, a testing tube is arranged on the compensation corrugated pipe, and a treatment discharge tube is arranged on the testing tube. The invention can replace the exhaust barrel section of the original barrel group, realizes the real-time test of the stability of materials on the premise of not interrupting production by utilizing the waste gas in the extrusion process, can distinguish the instability type when the fluctuation of the melt pressure and the abnormality of the gas concentration occur simultaneously under the combined action of the front-end air pressure sensor, the sintering filter layer, the rear-end air pressure sensor and the gas concentration sensor, and can carry out safe combustion treatment on the monitored waste gas by arranging the treatment exhaust pipe.

Inventors

  • WANG SHANSHAN
  • CHEN LONG

Assignees

  • 南京杰亚挤出装备有限公司

Dates

Publication Date
20260512
Application Date
20260413

Claims (9)

  1. 1. The utility model provides a screw extruder extrusion stability test equipment, includes test barrel section (1), test barrel section (1) installs on the extruder body, replaces the aiutage section of original barrel group for material state in the on-line monitoring extrusion process, its characterized in that, test barrel section (1) top and lateral wall all are equipped with the mounting groove, are located install guide block (2) on the mounting groove at test barrel section (1) top, guide block (2) top eccentric is provided with gas vent (3), are located install on the mounting groove of test barrel section (1) lateral wall and melt pressure sensor (4), install test base plate (5) on guide block (2), be equipped with air inlet (6), regulation push cylinder (7) and control box (8) on test base plate (5), be equipped with compensation bellows (9) on air inlet (6), install test tube (10) on compensation bellows (9), the lateral wall of test tube (10) is equipped with rear end air pressure sensor (11) and gas concentration sensor (12), install on test tube (13) on the test tube; An air inlet (6) on the test substrate (5) is aligned with the air outlet (3), and four limit sliding rods (14) are arranged on the surface of the test substrate (5) around the air inlet (6); The bottom of compensation bellows (9) is equipped with the extension, the lateral wall of extension is equipped with front end air pressure sensor (15), the lateral wall on compensation bellows (9) top is equipped with four slip fixed lugs (16) and an installation fixed lug (17), slip fixed lug (16) and spacing slide bar (14) sliding connection, the piston rod fixed connection of installation fixed lug (17) and regulation push away jar (7).
  2. 2. The extrusion stability test equipment of the screw extruder according to claim 1, wherein an arc-shaped block (201) matched with an internal flow channel in the extruder body is arranged at the bottom of the flow guide block (2), and a flow guide curved surface (202) is arranged at the bottom of the arc-shaped block (201) and used for guiding waste gas to the exhaust port (3).
  3. 3. The screw extruder extrusion stability testing device according to claim 1, characterized in that a heat insulation gasket (18) is arranged below the testing substrate (5) for preventing heat conduction.
  4. 4. The extrusion stability test equipment of the screw extruder according to claim 1, wherein a sintering filter layer (19) is installed at the bottom of the test tube (10), and the sintering filter layer (19) is located below the rear end air pressure sensor (11) and the gas concentration sensor (12) and is used for filtering non-gas impurities in waste gas and preventing the non-gas impurities from interfering with the capture of characteristic gases by the gas concentration sensor (12).
  5. 5. The extrusion stability test apparatus of a screw extruder according to claim 4, wherein the compensating bellows (9) is used to compensate for the change in air flow resistance caused by contamination of the sintering filter layer (19), and the initial height of the compensating bellows (9) is the same as two-thirds of the distance from the top end of the limit slide bar (14) to the surface of the test substrate (5) to provide the distance required for telescoping the compensating bellows (9).
  6. 6. The extrusion stability test device of a screw extruder according to claim 1, wherein the melt pressure sensor (4), the front end air pressure sensor (15), the rear end air pressure sensor (11) and the adjusting push cylinder (7) are electrically connected with the control box (8), wherein the front end air pressure sensor (15) and the rear end air pressure sensor (11) form a differential pressure monitoring assembly, and the control box (8) controls the adjusting push cylinder (7) to act and adjusts the length of the compensating corrugated pipe (9) according to the data of the front end air pressure sensor (15) and the rear end air pressure sensor (11) through the compensating control logic.
  7. 7. The screw extruder extrusion stability test apparatus of claim 1, wherein the compensation control logic is specifically: When (when) When the filtering layer pollution degree is judged to influence the gas sampling stability, and the filtering layer pollution degree is judged according to Offset amount calculation compensation height of (2) The adjusting pushing cylinder (7) is further controlled to drive the compensating corrugated pipe (9) to lift, the internal volume of the compensating corrugated pipe (9) is changed to compensate the downstream sampling flow, and the sampling flow fluctuation caused by the resistance change of the sintering filter layer (19) is counteracted; Wherein, the For a real-time pressure differential, , For the front-end barometric sensor (15) reading, For the back-end barometric sensor (11) reading, As a reference pressure differential to be used, The threshold is compensated for the pressure difference.
  8. 8. The screw extruder extrusion stability test apparatus of claim 7, wherein the compensating height The positive correlation with the differential pressure offset is as follows: Wherein the method comprises the steps of The value of the gas flow rate, the pipeline diameter and the filter layer characteristics are determined by experimental calibration according to the preset proportionality coefficient.
  9. 9. The extrusion stability test equipment of a screw extruder according to claim 1, wherein an annular corrugated flame-retardant plate (20) is mounted at the bottom of the inner side wall of the treatment discharge pipe (13) to prevent the combustion of the exhaust gas in the test pipe (10) due to backfire, a pulse igniter (21) for igniting the exhaust gas is arranged at the inner side wall of the top of the treatment discharge pipe (13), and a windshield (22) is mounted at the top of the treatment discharge pipe (13) to promote combustion stability.

Description

Stability test equipment is extruded to screw extruder Technical Field The invention relates to the technical field of extruder test equipment, in particular to extrusion stability test equipment of a screw extruder. Background The screw extruder is polymer processing equipment, and the extrusion stability of the screw extruder determines the quality of a product, so that when production with a new formula is attempted, the extrusion stability test needs to be carried out firstly, and parameters of a machine barrel group and a screw are adjusted accordingly; The extrusion stability is mainly expressed by fluctuation of melt pressure, uniformity of a temperature field and continuity of material flowing in a machine barrel, and the existing test method is that a melt pressure sensor and a temperature sensor are arranged on the machine barrel, and whether extrusion is stable or not is indirectly judged by monitoring fluctuation amplitude and frequency of the melt pressure; However, pressure fluctuation is only one expression form of extrusion instability, and a plurality of factors affecting stability, such as residual moisture in materials, non-discharged volatile matters, gases generated by thermal decomposition and the like, gas components and concentration changes escaping from an exhaust port in an exhaust extrusion process practically contain important information reflecting the state of the materials and the stability of the extrusion process, namely, when the extrusion process is stable, the gas precipitation rate is uniform, the components are relatively stable, when the extrusion fluctuation (such as abnormal temperature, shearing overheat and feeding fluctuation) occurs, pulse release or component mutation often occurs to the gas precipitation, and the information cannot be captured by a pressure sensor, so that the existing extrusion stability test equipment cannot test the stability of the materials in the extrusion process; for this reason, a screw extruder extrusion stability test apparatus is proposed to solve the above-mentioned problems. Disclosure of Invention The invention aims to solve the problem that extruder test equipment in the prior art cannot test the stability of materials in the extrusion process, and provides extrusion stability test equipment for a screw extruder. In order to achieve the above purpose, the present invention adopts the following technical scheme: The utility model provides a screw extruder extrusion stability test equipment, includes test barrel section, test barrel section installs on the extruder body, replaces the aiutage section of original barrel group for the material state in the on-line monitoring extrusion process, test barrel section top and lateral wall all are equipped with the mounting groove, are located install the water conservancy diversion piece on the mounting groove at test barrel section top, water conservancy diversion piece top eccentric is provided with the gas vent, is located install the melt pressure sensor on the mounting groove of test barrel section lateral wall, install test base plate on the water conservancy diversion piece, be equipped with air inlet, regulation push cylinder and control box on the test base plate, be equipped with the compensation bellows on the air inlet, install the test tube on the compensation bellows, the lateral wall of test tube is equipped with rear end barometric sensor and gas concentration sensor, install the processing drain pipe on the test tube; the air inlet on the test substrate is aligned with the air outlet, and four limit sliding rods are arranged on the surface of the test substrate around the air inlet; the bottom of compensation bellows is equipped with the extension, the lateral wall of extension is equipped with front end air pressure sensor, the lateral wall on compensation bellows top is equipped with four slip fixed lugs and an installation fixed lug, slip fixed lug and spacing slide bar sliding connection, installation fixed lug and the piston rod fixed connection who adjusts the push cylinder. Preferably, the bottom of the flow guiding block is provided with an arc-shaped block matched with the internal flow channel in the extruder body, and the bottom of the arc-shaped block is provided with a flow guiding curved surface for guiding the waste gas to the exhaust port. Preferably, a heat insulation gasket is arranged below the test substrate and used for preventing heat conduction. Preferably, a sintering filter layer is installed at the bottom of the test tube, and the sintering filter layer is located below the rear-end air pressure sensor and the gas concentration sensor and is used for filtering non-gas impurities in the waste gas and preventing the non-gas impurities from interfering with the capture of characteristic gas by the gas concentration sensor. Preferably, the compensation corrugated pipe is used for compensating air flow resistance change caused by pollution of the sin