A portable sampling device for polyoxymethylene twin-screw polymerization extruder

Abstract

The invention discloses a portable sampling device of a double-screw polyformaldehyde polymerization extruder. The portable sampling device comprises a fixed plate with a sampling opening, a plugging component and a sampler, wherein the fixed plate with the sampling opening is fixed at a sampling opening of the extruder and is used for sampling and positioning a material and preventing leakage of the material; the plugging component comprises a rotating shaft, a dismounting handle which has a shape of Chinese character yi, a top plate, a plugging block and a blind plug; the rotating shaft, the top plate, the plugging block and the blind plug are fixedly connected with one another in sequence or are integrally molded; the dismounting handle which has the shape of Chinese character yi is fixed on the rotating shaft; the shape and the size of the plugging block are consistent with those of the sampling opening and is used for plugging the sampling opening; the sampler comprises a handle, a plugging plate and a sampling pipe which are connected in sequence; a groove is formed in the sampling pipe. During sampling, the portable sampling device can prevent high-concentration formaldehyde and dust from being sprayed out, so that injury to people and pollution to the environment are reduced to the maximum extent; people only need to wear an air filter during sampling, and safety protection can be realized.

Description

technical field [0001] The invention belongs to a sample collection device. Background technique [0002] Polyoxymethylene (POM) is based on [-CH 2 -O-] main chain, unbranched, high melting point, high density, high crystalline thermoplastic engineering plastics, with high strength and rigidity, excellent creep resistance, fatigue resistance, inherent lubricity, wear resistance It is the kind of engineering plastics with properties closest to metals, and can be used to replace copper, aluminum, zinc and other non-ferrous metals and alloy products. It is widely used in electronics, electrical, automobiles, light industry, machinery, chemical industry, Building materials and other fields. [0003] The twin-screw polymerization extruder is a device for converting trioxane to polyoxymethylene, and it is divided into four stages of polymerization. When reacting in the first-stage polymerization extruder, the material is converted from liquid to solid, and the conversion rate o...

AI Technical Summary

Problems solved by technology

[0004] 1. In the initial stage of start-up reaction, the material is a mixture of most of the powder and a small part of the slurry, and the sampling port is very easy to block

Due to the nature of the material, the blocked material is extremely hard, and it takes time and effort to open it;

[0005] 2. Personnel take samples frequently, about every 5 minutes. The formaldehyde gas generated during the reaction will be ejected from the sampling port. Long-term inhalation will cause serious harm to the health of personnel and pollute the environment;

[0006] 3. Since the material sticks to the blind flange, the sampling time takes about 1 minute (not counting the time for dismantling and installing the bolts). If the time is too long, a large amount of air will easily enter and affect the material index. In severe cases, it will cause chain jumps. car, causing serious damage;

[0007] 4. When sampling, due to the high concentration of formaldehyde gas emitted from the sampling port, the sampling personnel need to wear self-contained air respirators and light chemical protective clothing for operation, which brings inconvenience to the operation

In addition, in winter, due to the accumulation of breathing vapor on the inner wall of the mask, it will seriously affect visibility and cause accidental injuries

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