CN-121977915-A - Simulation rotational molding sample preparation device and sample preparation method

CN121977915ACN 121977915 ACN121977915 ACN 121977915ACN-121977915-A

Abstract

The invention discloses a simulation rotational molding sample preparation device and a sample preparation method, which belong to the technical field of testing, wherein the simulation rotational molding sample preparation device comprises a support assembly, a support seat and a support seat; the mold assembly comprises a forming mold and a cover plate, wherein the forming mold is provided with a mold cavity formed by downwards sinking from the top of the forming mold, a cover plate sealing cover is arranged on the upper side of the mold cavity, the cover plate is detachably connected with the forming mold, the cover plate is provided with two airflow channels, two ends of each airflow channel are respectively called an inner end and an outer end, the inner ends are communicated with the mold cavity, the outer ends are connected with stop valves, and the action assembly comprises a plurality of telescopic rods, and the top ends and the bottom ends of the telescopic rods are respectively connected with the forming mold and a supporting seat. The sample preparation method uses the simulated rotational molding sample preparation device to prepare rotational molding samples. The simulation of the rotational molding process is realized, the sample preparation is completed, the sample preparation period is short, the material consumption is low, the cost is low, and the development progress is accelerated.

Inventors

ZHANG YU
CHEN HONGDA
ZHENG KAIDONG
HUANG GAI
LU QUNJIE
LI SHUXIN

Assignees

佛山仙湖实验室

Dates

Publication Date: 20260505
Application Date: 20260109

Claims (10)

1. A simulated rotational molding sample preparation device, comprising: the support assembly comprises a support seat; the mold assembly comprises a forming mold and a cover plate, wherein the forming mold is provided with a mold cavity formed by downwards sinking from the top of the forming mold, the cover plate is sealed and arranged on the upper side of the mold cavity, and the cover plate is detachably connected with the forming mold; the action assembly comprises a plurality of telescopic rods, and the top ends and the bottom ends of the telescopic rods are respectively connected with the forming die and the supporting seat.
2. The apparatus according to claim 1, wherein the motion assembly further comprises a rotating device, the rotating device comprises a rotating base, the rotating base is connected between the molding die and the telescopic rod, and the rotating base is provided with a rotating driver for driving the molding die to rotate.
3. A simulated rotational molding apparatus as claimed in claim 1, wherein said mold cavity has an upper cavity portion and a lower cavity portion, and a side wall of said upper cavity portion is provided with an observation window.
4. A simulated rotational molding apparatus as claimed in claim 1, wherein said inner end is provided with a filter element.
5. A sample preparation method, which is characterized in that a rotational molding sample is prepared by using the simulated rotational molding sample preparation device as claimed in claim 2, and comprises the following steps: The preparation step comprises the following steps: Adding a proper amount of modified material into the die cavity; Introducing nitrogen into the die cavity to replace air in the die cavity; The molding step comprises the following steps: heating the mold assembly; controlling the action assembly to shake the forming die to enable the modified material to be spread on the bottom surface of the die cavity; a shaping step, comprising: continuously executing the forming step until the modified material is completely melted; a cooling step, comprising; stopping heating the die assembly, stopping the action assembly, and introducing nitrogen to perform auxiliary cooling until the temperature of the forming die reaches the room temperature; a material taking step, comprising: and taking out the molded polymer plate.
6. The method according to claim 5, wherein the preparing step further comprises cleaning an inner wall of the cavity.
7. The method for preparing a sample according to claim 5, wherein the step of adding a proper amount of the modifying material to the cavity comprises calculating the volume of the modifying material based on the area of the bottom surface of the cavity and the thickness of the sample to be prepared, calculating the amount of the modifying material by the bulk density of the modifying material, placing the weighed modifying material in the cavity, and scraping the surface of the modifying material with a doctor blade.
8. The method according to claim 5, wherein the molding step further comprises controlling the rotary driver to rotate the molding die at the first angular velocity.
9. The method according to claim 8, wherein the step of forming further comprises raising one side of the forming mold by the control action assembly to tilt the forming mold.
10. The method according to claim 8, wherein the cooling step further comprises controlling the rotary driver to drive the molding die to rotate at a second angular velocity, the second angular velocity being smaller than the first angular velocity.

Description

Simulation rotational molding sample preparation device and sample preparation method Technical Field The invention relates to the technical field of testing, in particular to a simulation rotational molding sample preparation device and a sample preparation method. Background The plastic inner container of the hydrogen storage bottle needs to pass through a plurality of verification items such as a hydrogen permeation test, a tensile property test, a hydrogen circulation test, a hydrogen aging test and the like, and the sample needs to be sampled from a specific position specified by an inner container base material, a welding joint, a die line and the like, and is strictly matched with actual forming conditions (such as sampling position spacing, sample size, test temperature pressure and the like) so as to ensure that a test result can truly reflect the performance of the inner container in a service environment. However, in the initial stage of applicability verification in the development process of the high-capacity hydrogen storage cylinder material, the existing mode has obvious limitations and inadequacies, and the existing scheme needs to rotationally mould the material into a complete liner, and then cut and sample according to standard requirements. The method not only causes large raw material consumption and high forming cost (the rotational molding cost of a single complete liner is tens of thousands yuan), but also has long forming sample making period (usually more than or equal to 8 hours), and seriously slows down the development progress. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a simulation rotational molding sample preparation device and a sample preparation method. An embodiment of the invention provides a simulated rotational molding sample preparation device, comprising: the support assembly comprises a support seat; the mold assembly comprises a forming mold and a cover plate, wherein the forming mold is provided with a mold cavity formed by downwards sinking from the top of the forming mold, the cover plate is sealed and arranged on the upper side of the mold cavity, and the cover plate is detachably connected with the forming mold; the action assembly comprises a plurality of telescopic rods, and the top ends and the bottom ends of the telescopic rods are respectively connected with the forming die and the supporting seat. The simulated rotational molding sample preparation device has the advantages that during use, powdery or granular modified materials can be placed in a die cavity, nitrogen is introduced to replace air in the die cavity, the die assembly is heated, a plurality of telescopic rods are controlled to be telescopic and shake according to preset rules respectively, the modified materials are melted and spread in the die cavity, after the temperature is kept for a period of time, the temperature is reduced, a sample is taken out, simulation of a rotational molding process is realized, sample preparation is completed, the sample preparation period is short, material consumption is low, the cost is low, and development progress is accelerated. According to some embodiments of the invention, the motion assembly further comprises a rotating device comprising a rotating base connected between the forming die and the telescopic rod, the rotating base being provided with a rotating driver for driving the forming die to rotate. According to some embodiments of the invention, the mold cavity has an upper cavity portion and a lower cavity portion, a sidewall of the upper cavity portion being provided with a viewing window. According to some embodiments of the invention, the inner end is provided with a filter. According to a sample preparation method of an embodiment of the second aspect of the present invention, a rotational molding sample is prepared by using the above-mentioned simulated rotational molding sample preparation device, the sample preparation method comprising the steps of: The preparation step comprises the following steps: Adding a proper amount of modified material into the die cavity; Introducing nitrogen into the die cavity to replace air in the die cavity; The molding step comprises the following steps: heating the mold assembly; controlling the action assembly to shake the forming die to enable the modified material to be spread on the bottom surface of the die cavity; a shaping step, comprising: continuously executing the forming step until the modified material is completely melted; a cooling step, comprising; stopping heating the die assembly, stopping the action assembly, and introducing nitrogen to perform auxiliary cooling until the temperature of the forming die reaches the room temperature; a material taking step, comprising: and taking out the molded polymer plate. The sample preparation method according to the embodiment of the