Heavy-metal-free grinding rod and manufacturing method thereof

Abstract

The invention discloses a heavy-metal-free grinding rod and a manufacturing method thereof. The heavy-metal-free grinding rod comprises a grinding rod shell, a balance weight column, a first nut and asecond nut, wherein the balance weight column is arranged in the grinding rod shell; the two ends of the grinding rod shell are in threaded connection with the first nut and the second nut respectively; the density of titanium alloy is generally about 4.5 g / cm<3>, the weight is low, and various requirements of relative crushing time for the fineness of crushed materials cannot be met by purely adopting grinding rod materials, so that a titanium alloy TA2 titanium tube with the diameter being 21 mm, the inner diameter being 15 mm and the length being 180 mm is adopted, a stainless steel rod with the density of 7.93 g / c<3> is filled inside the TA2 titanium tube, then the TA2 titanium tube is machined and tapped through a drilling machine, the longitudinal depth of the two ends of the TA2 titanium tube is 10 mm, then the TA2 titanium rod is embedded into the two ends of the TA2 titanium tube in a thread picking machining proportion to seal the stainless steel rod, and thus the grinding rod is assembled to meet various requirements of the relative crushing time on the fineness of the crushed materials.

Description

technical field [0001] The invention specifically relates to the technical field of a low-temperature vibrating ultrafine pulverizer, in particular to a heavy metal-free grinding rod and a manufacturing method thereof. Background technique [0002] In the food and pharmaceutical fields, low-temperature vibrating ultrafine pulverizers are usually used to grind some raw materials to meet the crushing standard. At present, most of the common grinding rods on the market are made of stainless steel, but the grinding rods are bound to be broken when grinding. Some wear occurs, and the powder after the grinding rod is worn remains in the raw material. According to the requirements in the GB5009 document, the required limit of heavy metal residue after crushing: lead (Pb) mg / kg≤2.0; arsenic (HS) mg / kg≤1; Mercury (Hg) mg / kg≤0.1; Cadmium (Cd) mg / kg≤0.5; Nickel (Ni) mg / kg≤1.0; Chromium (Cr) mg / kg≤2.0. [0003] The raw material ground by the stainless steel grinding rod in contact with...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of non-heavy metal grinding rod and its preparation method, to solve the existing grinding rod proposed in the above-mentioned background technology, some wear will occur during grinding, and the powder after the grinding rod is worn remains in the In the raw materials, the raw materials ground by stainless steel grinding rods cannot meet the requirements stipulated by the state

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