Vertical air-flow fluidisation crushing and classification machineThe utility model is a kind of vertical air-flow fluidisation crushing and classification machine, belongs to the further improvement of vertical jet mill grinding machine structure.
Common vertical jet mill grinding machine is made up of grader and pulverizer.For guaranteeing the high speed rotating of grading wheel, must leave the gap between the upper surface of housing internal classification wheel and the discharge neck end face on the housing, during the grading wheel high speed rotating, send from the discharge eck, reach the purpose of classification by classified blade of taking turns of fines and center discharging opening that pulverizer crushes.Its weak point is:
1, when the grading wheel high speed rotating, beginning, the terminal in gap exist pressure reduction, and the meal material easily enters this gap inevitably, and enters by this gap in the fine powder material of discharging opening, makes the Granularity Distribution inequality, and effectiveness of classification is low.
2, because the meal material causes the serious wear of grading wheel in the gap, service life is short, makes machine only be fit to the crushing and classification of lightweight and low hard ware material, can not be used for the material grinding classification of general hard ware material and above hardness.
3, because of entering the meal material in the gap, cause the grading wheel friction and cause the heating and the temperature rise of grader, make machine can not be used for responsive to temperature material (be that temperature is higher than a certain limiting temperature, just lose the material (down together) of all or part of material behavior), the scope of application is limited.
4, because the discharging opening of grading wheel head center is a straight-tube shape, identical with the diameter of discharge gate, so the fine powder of taking out of with high velocity air behind the classified impeller blade is very big to the friction dynamics of discharge gate wall, friction and wear is very big relatively.
The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art and a kind of vertical air-flow fluidisation crushing and classification machine is provided, can eliminate gap beginning, the pressure reduction of terminal and the friction of grading wheel fully, realize no pressure reduction classification, improve the service life of effectiveness of classification, product purity and grading wheel, enlarge the scope of application of crushing and classification material.
The purpose of this utility model can reach by following measure: between vertical grader and pulverizer fluid bed is arranged, gap between meshing of the convex-concave shape end face of grader grading wheel and the concavo-convex end face on the discharge neck constitutes the gap, labyrinth, and a sealing gland mechanism to gap, labyrinth sealing gland is arranged on the discharge neck.
The purpose of this utility model can also reach by following measure: the sealing gland mechanism on the grader discharge neck is made up of gimbal, outer shroud and interior ring, its center is a discharge gate, the meshing gap of the concavo-convex end face of being made up of gimbal, outer shroud and interior ring and the convex-concave shape end face of grading wheel head constitutes the labyrinth, gap, be air chamber between gimbal and the outer shroud, and the annular space winding-up gap that is communicated with the gap, labyrinth arranged, between outer shroud and the interior ring is air chamber, and the annular space winding-up gap that is communicated with the gap, labyrinth is arranged; The annular space winding-up gap of the air chamber of gimbal and outer interannular is greater than the annular space winding-up gap of the air chamber of outer shroud and interior interannular; The discharging opening of grading wheel head center is horn-like, and its osculum is towards the discharge neck; On two air chambers the joint that connects source of the gas is arranged all.
Description of drawings: Fig. 1 is the utility model structure chart
Fig. 2 is the utility model grader part section structure chart
The utility model is compared prior art and is had following advantage:
1, grader adopt the gap of grading wheel upper surface and discharge neck end face be the gap, labyrinth structure and by The sealing mechanism that interior ring, outer shroud, gimbal form connects connecing of source of the gas by regulating on two air chambers Head makes air pressure in outer shroud and the interior interannular air chamber greater than the air pressure at top, gap, labyrinth and gimbal and outer Air pressure in the interannular air chamber, the gas of two interior certain pressures of air chamber is jetted the gap with the gap by annular space Segmentation sealing gland in labyrinth makes the beginning in gap, the pressure of terminal tend to balance, thereby eliminate the labyrinth fully Begin in the gap, the pressure reduction of terminal, and making its pressure reduction is zero, has both guaranteed the high speed rotating of grading wheel, keeps away again Exempt from bringing into of coarse dust, make Granularity Distribution even, improved effectiveness of classification.
2, the discharge neck of grader adopts the air seal structure that inner and outer rings, gimbal form, and avoids meal to advance Enter the gap, labyrinth, eliminated the wearing and tearing of grading wheel, both prolonged the service life of grading wheel, solved again The problem of frictional heating temperature rise, make machine be not only applicable to general hard ware material, high hard amount material and The classification of ultrahigh hardness material (as: can carry out classification up to 10 diamond to Mohs' hardness) also can The classification that is used for the responsive to temperature material (as: can be that 60 ℃ plastic additive advances to a kind of high-temperature resistant The row classification), greatly enlarged the scope of application.
3, the discharging opening of grading wheel head is horn-like, and its osculum is towards the discharge neck, classifiedly takes turns the fine powder that discharging opening is taken out of with air-flow, go out horn mouth after very fast release slow down, fine powder to the friction dynamics of discharge gate wall slow down, wearing and tearing reduces greatly.
4, wearability fluid bed and above-mentioned wearability are good preferably grader and pulverizer being formed vertical air-flow fluidisation crushing and classification machine, is a kind of combining structure of best wear resistence.The high velocity air jet intersection of powder in pulverizer collides mutually and pulverizes, and rise with air-flow and to enter the grader classification through fluid bed, coarse granule is because the difference in height of fluid bed, under the effect of the airflow fields such as eddy current that its gravity and vertical grader produce, all fall to crushing chamber and continue to pulverize, avoided hard coarse granule to the wearing and tearing of grader with to the influence of effectiveness of classification and to the influence of product purity.Can be used to have the material of ultrahigh hardness of hard, high hard and Mohs' hardness height to 10 that high-purity requires and the material and the classification of responsive to temperature material grinding of middle and high proportion.Its very high effectiveness of classification, high complete machine anti-wear performance and the high-purity of product are better than present any jet mill grinding machine.
The utility model is described in further detail below in conjunction with the embodiment accompanying drawing:
As shown in Figure 1: vertical air-flow fluidisation crushing and classification machine is made up of grader and fluid bed and pulverizer, be fluid bed (16) between vertical grader (15) and the pulverizer (18), grader comprises and is fastened on the grading wheel (2) on the machine shaft in the housing (1) and is fixed in discharge neck (3) on the housing (1).The bottom of fluid bed (16) is pulverizer (18), and 2 jet pipes (17) and charging aperture (19) are arranged on it.The high velocity air jet intersection of powder in pulverizer (18) collides mutually and pulverizes, and rise with air-flow and to enter grader (15) classification through fluid bed (16), coarse granule is because the difference in height of fluid bed, under the effect of the airflow fields such as eddy current that gravity and vertical grader produce, it is broken all to fall to pulverizer relaying continued powder.Both made and pulverized middle and highly during than heavy material, the grader parts almost do not have wearing and tearing yet.
As shown in Figure 2: on the grader discharge neck (3) sealing gland mechanism is arranged, form by gimbal (5), outer shroud (7) and interior ring (9), its center is discharge gate (14), and the meshing gap of the concavo-convex end face of being made up of gimbal (5), outer shroud (7) and interior ring (9) and the convex-concave shape end face of grading wheel head (8) constitutes gap, labyrinth (12).Be air chamber (4) between gimbal (5) and the outer shroud (7), and the annular space winding-up gap (10) that is communicated with gap, labyrinth (12) arranged, be air chamber (6) between outer shroud (7) and the interior ring (9), and the annular space winding-up gap (11) that is communicated with gap, labyrinth (12) arranged, all there is the joint that connects source of the gas in the annular space winding-up gap (10) of air chamber (4) greater than air chamber (6) annular space winding-up gap (11) on air chamber (4), (6).The discharging opening (13) at grading wheel head (8) center is horn-like, and its osculum is towards discharge neck (3).
By regulating the joint that connects source of the gas on two air chambers, make air pressure in the air chamber (6) greater than the air pressure at top, gap, labyrinth (12) and the air pressure in the air chamber (4), and the gas of certain air pressure is jetted gap (10), (11) with gap, labyrinth (12) segmentation sealing gland by annular space in the air chamber, the pressure in gap, labyrinth (12) is tended to balance, begin in the gap, labyrinth, the pressure reduction of terminal thereby eliminated fully, and its pressure reduction is zero.Both guarantee the high speed rotating of grading wheel (2), avoided bringing into of coarse dust again, eliminated the friction of grading wheel and the problem of heating up, make Granularity Distribution even, improve effectiveness of classification, prolonged the service life of grading wheel, enlarged the scope of application of machine.