Uniform adjustable powder feeding device

A powder feeding device and uniform technology, applied in packaging and other directions, can solve the problems of difficulty in accurately conveying small flow powder materials, large differences in powder feeding uniformity, poor feeding uniformity, etc., achieving simple structure and wide powder volume adjustment range. , The effect of powder feeding is even and adjustable

Inactive Publication Date: 2012-07-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the feeding uniformity is poor, and the uniformity and precision are mainly controlled by the structure and precision of the screw shaft. It is difficult to accurately convey small flow powder, and the error is large.
When the pressure does not fluctuate, the mass error per minute is more than 1 gram (the relative error is generally greater than 15%); when the outlet pressure fluctuates, the uniformity of powder feeding varies greatly, especially when the instantaneous pressure difference is large, it is easy to Material breakage or sliding material (rapid outflow) occurs, and the screw shaft is prone to jamming for ultra-fine powders with relatively high hardness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using ZrCl 4 -CH 4 -H 2 -Ar system, atmospheric pressure chemical vapor deposition ZrC coating, the powder feeder is installed in the middle of the furnace roof of the vertical vapor deposition furnace, ZrCl 4 The powder is loaded into the material tank 4 from the charging port 9, and the carbon source gas CH 4 , reducing gas H 2 And the dilution gas Ar is introduced by the intake pipe 7, and the speed regulating motor 1 is started to make the screw shaft 12 rotate at a specified speed, and the ZrCl 4 The powder flows down steadily from the lower end of the screw shaft 12, mixes with the gas entering the inlet pipe 7, and directly enters the vapor phase deposition furnace through the gas outlet and powder outlet pipe 15, and the ZrCl 4 After the powder enters the furnace, it is heated and gasified, and then reduced and carbonized on the substrate to form a ZrC coating.

[0018] When the diameter of the screw shaft is 25mm and the diameter of the feeding tube is 25....

Embodiment 2

[0022] Using TaCl 5 -C 3 h 6 -H 2 -Ar system, chemical vapor deposition TaC coating, the powder feeder is installed in the upper part of the furnace of the vertical vapor deposition furnace, TaCl 5 The powder is loaded into the material tank 4 from the charging port 9, and the carbon source gas C 3 h 6 , reducing gas H 2 And the dilution gas Ar is introduced by the intake pipe 7, and the speed regulating motor 1 is started to make the screw shaft 12 rotate at a specified speed, and TaCl 5 The powder flows down steadily from the lower end of the screw shaft 12, mixes with the gas entering the inlet pipe 7, and directly enters the vapor deposition furnace through the gas outlet and powder outlet pipe 15, and the TaCl 5 After the powder enters the furnace, it is heated and gasified, and then reduced and carbonized on the substrate to form a TaC coating.

[0023] When the diameter of the screw shaft is 20mm, under the same screw pitch (5mm), the same screw shaft speed (20r / ...

Embodiment 3

[0027]In the Ar environment, the submicron WC-Co composite powder is conveyed under normal pressure and positive pressure. When the diameter of the screw shaft is 15mm, different screw pitches (mm) and 12 rotation speeds (r / min) of the screw shaft are conveyed. The powder feeding rate of 0.30~0.50μm WC-Co composite powder is shown in Table 3. It can be seen that in the case of different screw pitches and screw shaft speeds, the error of normal pressure powder feeding is not higher than 0.02 g / min, and the relative error is less than 1%. The rate and error of powder feeding are close to normal pressure under the condition that the pressure of air supply pipe 7 is 3 atmospheres, and there is no obvious change.

[0028] Table 3: ZrCl 4 Powder feeding rate

[0029]

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PUM

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Abstract

The invention provides a uniform adjustable powder feeding device which comprises an speed-adjusting motor, an speed-adjusting motor transmission shaft, a feed tank cover, a feed tank, a feeding shaft and an air inlet pipe, wherein the feed tank cover is arranged on the feed tank, a vacuum sealing washer is arranged between the feed tank and the feed tank cover, a vacuum dynamic seal device is arranged in the middle of the feed tank cover, a loading port is formed at an edge of the feed tank cover, the upper end of a rotating shaft of the vacuum dynamic seal device is connected with the speed-adjusting motor transmission shaft, the lower end of the rotating shaft of the vacuum dynamic seal device is connected with the upper end of the feeding shaft, the feeding shaft is perpendicularly mounted, a spiral shaft is arranged at the lower part of the feeding shaft, the spiral shaft is inserted into a feed pipe at the bottom of the feed tank, the feeing shaft is a hollow shaft, a gap is formed at the junction of the upper end of the feeding shaft and the rotating shaft of the vacuum dynamic seal device, the lower part of the feed pipe is communicated with an air / powder discharge pipe, the air inlet pipe is connected with the middle part of the feed pipe and the middle part of the air / powder discharge pipe, and a valve is arranged on the air inlet pipe. The uniform adjustable powder feeding device solves the problem that the spiral shaft is choked by using the cooperative action of gravity force and spiral force, and improves the powder feeding accuracy in case of no pressure fluctuation by adopting the hollow spiral shaft.

Description

technical field [0001] The invention relates to a uniform and adjustable powder feeding device. Background technique [0002] In chemical vapor deposition, laser cladding and plasma spraying, etc., the problem of quantitative and uniform powder transportation is involved, and the quality and uniformity of the control are directly related to the success of the process and the quality of the coating performance. For example, in the chemical vapor deposition process, there are many raw materials that are solid at room temperature (such as ZrCl 4 , HfCl 4 , TaCl 5 , ZrF 4 , YBr 3 etc.), there are two ways to feed the raw materials into the reaction furnace, one is to introduce the raw materials into the furnace after being heated and gasified, which has a low utilization rate of the raw materials and is easy to block the pipeline; the other is to directly send the raw material powder in the form of solid This method can overcome the above shortcomings, but it needs to sol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65G33/08
Inventor 李国栋熊翔刘岗王雅雷郑湘林
Owner CENT SOUTH UNIV
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