阅读说明：本技术 一种金属粉干燥机 (Metal powder drying machine ) 是由 魏放 张柯 唐跃跃 叶国晨 蒋保林 许荣玉 于 2019-11-19 设计创作，主要内容包括：一种金属粉干燥机,包括下料部件和气粉混合部件,下料部件包括下料组件和散料组件；其中下料组件包括防尘罩、下料仓、下料斗、下料皮带,所述散料组件包括散料板组、固定环、传动组件、定位环,散料组件还包括超声波振动筛,超声波振动筛的顶边与定位环底面密封配合；还包括密封环、进气管、干燥罐、排料管、旋风收集器、导流板；干燥罐的底面是一个向上凸起的导流板,干燥罐的底端固定连通排料管,排料管与旋风收集器连通。该干燥机,金属粉分散更均匀,干燥效率更高,设备磨损小。(A metal powder dryer comprises a blanking part and an air powder mixing part, wherein the blanking part comprises a blanking assembly and a bulk material assembly; the blanking assembly comprises a dust cover, a blanking bin, a blanking hopper and a blanking belt, the bulk material assembly comprises a bulk material plate group, a fixing ring, a transmission assembly and a positioning ring, the bulk material assembly further comprises an ultrasonic vibration sieve, and the top edge of the ultrasonic vibration sieve is in sealing fit with the bottom surface of the positioning ring; the device also comprises a sealing ring, an air inlet pipe, a drying tank, a discharge pipe, a cyclone collector and a guide plate; the bottom surface of the drying tank is an upward convex guide plate, the bottom end of the drying tank is fixedly communicated with a discharge pipe, and the discharge pipe is communicated with a cyclone collector. This desiccator, metal powder dispersion is more even, and drying efficiency is higher, and equipment wear is little.)

1. A metal powder dryer comprises a blanking part and a gas-powder mixing part, and is characterized in that the blanking part comprises a blanking assembly and a bulk material assembly;

the blanking assembly comprises a dust cover, a blanking bin, a blanking hopper and a blanking belt, wherein the dust cover consists of a cylindrical barrel and a spherical top surface, and the edge of the spherical top surface is fixed with the top edge of the cylindrical barrel in a sealing way;

an opening at the top end of the dust cover is communicated with a feed opening of the feed bin in a sealing way;

a discharging belt is fixed in the discharging bin, and the belt surface of the discharging belt is positioned right below the discharging opening of the discharging bin; the blanking end is positioned right above the opening at the top end of the dust cover;

the bulk component comprises a bulk material plate group, a fixing ring, a transmission component and a positioning ring, wherein the bulk material plate group 1 consists of 3-6 right-angle triangular plates, right-angle sides of the triangular plates with the same height are superposed, the other right-angle side of each triangular plate is fixedly connected with the fixing ring through a fixing rod, the extended lines of the right-angle sides superposed by the triangular plates pass through the circle center of the fixing ring, the included angle between the top end of the right-angle side, which is in mutual contact with the triangular plates, and the inclined side is 50-70 degrees, and the distance between the tip end of the right-angle side at the bottom side of each triangular; the outer circumference of the fixing ring is in sliding fit with the positioning ring, the transmission assembly is matched with the fixing ring, and the transmission assembly drives the fixing ring to rotate on the positioning ring;

the bottom edge of the cylindrical cylinder of the dust cover is in sliding seal fit with the top surface of the fixed ring or the outer surface of the bottom of the cylindrical cylinder is in sliding seal fit with the inner annular surface of the fixed ring;

the bulk cargo assembly also comprises an ultrasonic vibration sieve, and the top edge of the ultrasonic vibration sieve is in sealing fit with the bottom surface of the positioning ring;

the device also comprises a sealing ring, an air inlet pipe, a drying tank, a discharge pipe, a cyclone collector and a guide plate;

the bottom edge of the ultrasonic vibration sieve is fixedly connected with the top edge of the drying tank in a sealing way through a sealing ring;

the number of the air inlet pipes is even, the number of the air inlet pipes is 2-6, the air inlet pipes are symmetrically arranged relative to the axis of the drying tank, the included angle alpha between the axis of each air inlet pipe and the horizontal plane is 10-18 degrees, the air inlet pipes are obliquely and downwards arranged, and the air inlet pipes are tangent to the wall of the drying tank;

the bottom surface of the drying tank is an upward convex guide plate, the bottom end of the drying tank is fixedly communicated with a discharge pipe, and the discharge pipe is communicated with a cyclone collector.

2. The metal powder drying machine according to claim 1, further comprising a dome, a diversion cap, a second air inlet pipe, and a communicating pipe;

the air guide sleeve is a conical sleeve with a hemispherical top end, and is coaxial with the drying tank, a gap is reserved between the bottom end of the air guide sleeve and the air guide plate, the surface of the air guide sleeve is provided with uniformly distributed air guide caps, the air guide caps protrude towards the outer side of the air guide sleeve and are communicated with the inner side and the outer side of the air guide sleeve, the opening of each air guide cap is inclined downwards, and the included angle β between the opening direction and the horizontal direction is in the range of 5-12 degrees;

the second air inlet pipe is located in the flow guide cover and coaxial with the flow guide cover, a vertically-arranged ventilation slit is formed in the surface of the second air inlet pipe, air enters the inner wall of the flow guide cover, the air inlet speed is not larger than that of an air inlet pipe, and the communicating pipe is communicated with the bottom end of the second air inlet pipe and used for introducing air to the second air inlet pipe.

3. A metal powder dryer as claimed in claim 1, wherein the diameter of the bottom edge of the shroud is 1/2-3/4 of the inside diameter of the drying vessel.

4. A metal powder drying machine as claimed in claim 1, wherein the longitudinal distance between the bottom surface of the ultrasonic vibration sieve and the top end of the place where the air inlet pipe communicates with the drying vessel is 1/10-1/8 of the longitudinal length of the drying vessel.

Technical Field

The invention relates to a metal powder drying machine, in particular to a drying device for 3D printing metal powder.

Background

The metal powder is usually stored in a sealed storage cylinder or a sealed tank after the atomization, but even in a sealed state, on one hand, air leakage is possible, on the other hand, the temperature of the metal powder before the storage is usually slightly higher than the room temperature, the air sealed together with the metal powder also contains moisture, and condensation can be formed after the temperature is reduced. When the metal powder is taken again for mixing or packaging, a small amount or trace amount of moisture may cause serious agglomeration for the metal powder with a very small specific surface area. Therefore, re-drying of the metal powder is one of the necessary processes.

The basic idea of the existing metal powder drying equipment is to dry the metal powder by using hot dry air or inert gas to contact with the metal powder. As prior art, chinese patent CN201810898675.0 is a novel metal powder dryer device, and its technical scheme is as follows: including the metal powder desiccator device jar body, metal powder desiccator device feed inlet right side is equipped with the heater, the heater sub-unit connection has the fan, the fan lower part is fixed with sealing device, sealing device lower part left side is equipped with the draught fan, the draught fan sub-unit connection has a jar body, the internal portion of jar is fixed with the guipure, the guipure left side is equipped with the heat preservation and presss from both sides the cover, heat preservation presss from both sides cover lower part right side and is fixed with the air distributor, heater lower part right side is fixed with the governing valve, the governing valve lower part is fixed with the detection strip, detection strip lower part left side is fixed with the bearing, bearing lower part right side is fixed with temperature sensor, the temperature sensor inboard is fixed with the heat.

There are several significant problems with this device: 1. the metal powder is very close to the air inducing point, and basically falls freely in the tank body, particularly at the lower part of the tank body, so that the drying efficiency is poor; 2. the metal powder has high density, and the direct blanking can impact and wear internal components of the equipment; 3. the induced air direction of draught fan has a problem, and unilateral induced air can lead to the metal powder at the internal removal orbit irregularity of jar, can't effectively guarantee metal powder and hot dry air fully contact.

Disclosure of Invention

The invention aims to provide a metal powder dryer which can fully ensure that metal powder is contacted with hot dry air, has high drying speed and has very small impact and abrasion on equipment.

In order to achieve the purpose, the invention comprises a blanking part and a gas-powder mixing part, wherein the blanking part comprises a blanking assembly and a bulk material assembly;

the blanking assembly comprises a dust cover, a blanking bin, a blanking hopper and a blanking belt, wherein the dust cover consists of a cylindrical barrel and a spherical top surface, and the edge of the spherical top surface is fixed with the top edge of the cylindrical barrel in a sealing way;

an opening at the top end of the dust cover is communicated with a feed opening of the feed bin in a sealing way;

a discharging belt is fixed in the discharging bin, and the belt surface of the discharging belt is positioned right below the discharging opening of the discharging bin; the blanking end is positioned right above the opening at the top end of the dust cover;

the bulk component comprises a bulk material plate group, a fixing ring, a transmission component and a positioning ring, wherein the bulk material plate group 1 consists of 3-6 right-angle triangular plates, right-angle sides of the triangular plates with the same height are superposed, the other right-angle side of each triangular plate is fixedly connected with the fixing ring through a fixing rod, the extended lines of the right-angle sides superposed by the triangular plates pass through the circle center of the fixing ring, the included angle between the top end of the right-angle side, which is in mutual contact with the triangular plates, and the inclined side is 50-70 degrees, and the distance between the tip end of the right-angle side at the bottom side of each triangular; the outer circumference of the fixing ring is in sliding fit with the positioning ring, the transmission assembly is matched with the fixing ring, and the transmission assembly drives the fixing ring to rotate on the positioning ring;

the bottom edge of the cylindrical cylinder of the dust cover is in sliding seal fit with the top surface of the fixed ring or the outer surface of the bottom of the cylindrical cylinder is in sliding seal fit with the inner annular surface of the fixed ring;

the bulk cargo assembly also comprises an ultrasonic vibration sieve, and the top edge of the ultrasonic vibration sieve is in sealing fit with the bottom surface of the positioning ring;

the device also comprises a sealing ring, an air inlet pipe, a drying tank, a discharge pipe, a cyclone collector and a guide plate;

the bottom edge of the ultrasonic vibration sieve is fixedly connected with the top edge of the drying tank in a sealing way through a sealing ring;

the number of the air inlet pipes is even, the number of the air inlet pipes is 2-6, the air inlet pipes are symmetrically arranged relative to the axis of the drying tank, the included angle alpha between the axis of each air inlet pipe and the horizontal plane is 10-18 degrees, the air inlet pipes are obliquely and downwards arranged, and the air inlet pipes are tangent to the wall of the drying tank;

the bottom surface of the drying tank 60 is provided with a guide plate 66 which protrudes upwards, and the bottom end of the drying tank is fixedly communicated with a discharge pipe which is communicated with a cyclone collector.

Further, the drying tank also comprises a flow guide cover, a flow guide cap, a second air inlet pipe and a communicating pipe;

the air guide sleeve 61 is a conical cover with a hemispherical top end, and is coaxial with the drying tank, a gap is reserved between the bottom end of the air guide sleeve and the air guide plate, the surface of the air guide sleeve is provided with uniformly distributed drainage caps, the drainage caps protrude towards the outer side of the air guide sleeve and are communicated with the inner side and the outer side of the air guide sleeve, the opening of each drainage cap is inclined downwards, and the included angle β between the opening direction and the horizontal direction is within the range of 5-12 degrees;

the second air inlet pipe is located in the flow guide cover and coaxial with the flow guide cover, a vertically-arranged ventilation slit is formed in the surface of the second air inlet pipe, air enters the inner wall of the flow guide cover, the air inlet speed is not larger than that of an air inlet pipe, and the communicating pipe is communicated with the bottom end of the second air inlet pipe and used for introducing air to the second air inlet pipe.

Preferably, the diameter of the bottom edge of the guide cover is 1/2-3/4 of the inner diameter of the drying cylinder.

Preferably, the longitudinal distance between the bottom surface of the ultrasonic vibration screen and the top end of the place where the air inlet pipe is communicated with the drying tank is 1/10-1/8 of the longitudinal length of the drying tank.

The metal powder drying device has the advantages that metal powder can be uniformly dispersed by using the ultrasonic vibration sieve for uniform blanking through discontinuous blanking, and meanwhile, the metal powder is sucked and impacted by using airflow to form negative pressure, so that the metal powder drying efficiency is effectively improved, and the impact and the abrasion of the dispersed metal powder and the airflow impact on equipment are very small.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Fig. 2 is an enlarged view of fig. 1.

Fig. 3 is a schematic view of the pod configuration.

Fig. 4 is a schematic diagram of a bulk material plate structure.

In the figure, a blanking assembly 10, a dust cover 11, a blanking bin 12, a blanking hopper 13, a blanking belt 14, a bulk material assembly 20, a bulk material plate group 21, a fixing ring 22, a transmission assembly 23, a positioning ring 24, an ultrasonic vibration screen 30, a sealing ring 40, an air inlet pipe 50, a drying tank 60, a flow guide cover 61, a flow guide cap 611, a second air inlet pipe 62, a communicating pipe 63, a discharging pipe 64, a cyclone collector 65 and a flow guide plate 66

Detailed Description

The invention is described in detail below with reference to the accompanying drawings.

A metal powder dryer comprises a blanking part and a gas-powder mixing part, and is characterized in that the blanking part comprises a blanking assembly 10 and a bulk material assembly 20;

the blanking assembly 10 comprises a dust cover 11, a blanking bin 12, a blanking hopper 13 and a blanking belt 14, wherein the dust cover 11 consists of a cylindrical barrel and a spherical top surface, and the edge of the spherical top surface is fixed with the top edge of the cylindrical barrel in a sealing way;

an opening at the top end of the dust cover 11 is communicated with a feed opening of the feed bin 12 in a sealing way;

a blanking belt 14 is fixed in the blanking bin 12, and the belt surface of the blanking belt 14 is positioned right below a blanking port of the blanking hopper 13; the blanking end is positioned right above the opening at the top end of the dust cover 11;

the bulk material assembly 20 comprises a bulk material plate group 21, a fixing ring 22, a transmission assembly 23 and a positioning ring 24, wherein the bulk material plate group 21 consists of 3-6 right-angle triangular plates, right-angle sides of the triangular plates with the same height are superposed, the other right-angle side of each triangular plate is fixedly connected with the fixing ring 22 through a fixing rod, the extended lines of the superposed right-angle sides of the triangular plates pass through the circle center of the fixing ring 22, the included angles between the top ends of the right-angle sides, which are in mutual contact with the triangular plates, and the inclined edge are 50-70 degrees, and the distance between the tip ends of the right-angle sides at the bottom sides of the; the outer circumference of the fixing ring 22 is in sliding fit with the inner ring of the positioning ring 24, the transmission assembly 23 is matched with the fixing ring 22, and the transmission assembly 23 drives the fixing ring 22 to rotate on the positioning ring 24; the fixing ring 22 and the positioning ring 24 can be matched in such a way that the bottom surface of the fixing ring 22 is provided with an annular bulge, the top surface of the positioning ring 24 is provided with an annular groove for accommodating the annular bulge, the transmission assembly 23 can be a belt or a gear transmission mechanism and is matched with the fixing ring 22 to drive the fixing ring 22 to rotate, the transmission assembly 23 comprises a motor and a gear or a belt pulley, when the gear is used for transmission, the gear is meshed with a gear on the outer surface of the fixing ring 22, when the belt is used for transmission, the belt is positioned on the belt pulley and the annular surface of the fixing ring 22;

the bottom edge of the cylindrical cylinder of the dust cover 11 is in sliding sealing fit with the top surface of the fixing ring 22 or the outer surface of the bottom of the cylindrical cylinder is in sliding sealing fit with the inner annular surface of the fixing ring 22;

the bulk cargo assembly also comprises an ultrasonic vibration screen 30, and the top edge of the ultrasonic vibration screen 30 is in sealing fit with the bottom surface of the positioning ring 24;

the device also comprises a sealing ring 40, an air inlet pipe 50, a drying tank 60, a discharge pipe 64, a cyclone collector 65 and a guide plate 66;

the bottom edge of the ultrasonic vibration screen 30 is fixedly connected with the top edge of the drying tank 60 in a sealing way through a sealing ring 40;

the number of the air inlet pipes 50 is even, the number of the air inlet pipes is 2-6, the air inlet pipes are symmetrically arranged relative to the axis of the drying tank 60, the included angle alpha between the axis of the air inlet pipe 50 and the horizontal plane is 10-18 degrees, the air inlet pipes are obliquely and downwards arranged, and the air inlet pipes 50 are tangent to the tank wall of the drying tank 60; the arrangement can form negative pressure at the lower side of the ultrasonic vibration screen to attract metal powder, so that dust in the dust cover 11 is avoided or reduced;

the bottom surface of the drying tank 60 is provided with a guide plate 66 which protrudes upwards, the bottom end of the drying tank 60 is fixedly communicated with a discharge pipe 64, and the discharge pipe is communicated with a cyclone collector 65.

When the dryer is used, metal powder can be intermittently fed into the dust cover 11 through the feeding belt 14, the bulk material plate group 21 rotates along with the fixing ring 22 to scatter the metal powder, the metal powder basically and uniformly falls onto the screen mesh of the ultrasonic vibration screen 30, the ultrasonic vibration screen 30 quickly screens the metal powder, the air inlet pipe 50 can be used for introducing air into the drying tank 60, the air inlet can be continuous air inlet or intermittent air inlet matched with the work of the ultrasonic vibration screen, the air flow rate is 10-50m/s, the temperature is 120-150 ℃, the electromagnetic valve can be fixedly arranged at the pipe orifice of the air inlet pipe 50, when the air is intermittently introduced, the air pressure is increased to 1.5-1.8 atmospheric pressures, then the electromagnetic valve is suddenly opened, instantaneous negative pressure is formed at the lower side of the ultrasonic vibration screen, and suction is formed on the metal powder to improve the contact area and time of the metal powder and hot dry gas.

In order to improve the drying effect, the drying tank further comprises a flow guide cover 61, a flow guide cap 611, a second air inlet pipe 62 and a communicating pipe 63;

the air guide sleeve 61 is a conical cover with a hemispherical top end, and is coaxial with the drying tank 60, a gap is reserved between the bottom end of the air guide sleeve 61 and the air guide plate 66, the surface of the air guide sleeve 61 is provided with uniformly distributed drainage caps 611, the drainage caps 611 protrude towards the outer side of the air guide sleeve 61 and are communicated with the inner side and the outer side of the air guide sleeve 61, the openings of the drainage caps 611 are inclined downwards, and an included angle β between the opening direction and the horizontal direction is in a range of 5-12 degrees;

the second air inlet pipe 62 is positioned in the air guide sleeve 61 and is coaxial with the air guide sleeve 61, a vertically arranged ventilation slit is arranged on the surface of the second air inlet pipe 62, air is fed into the inner wall of the air guide sleeve 61, the air inlet speed is not larger than that of the air inlet pipe 50, and the communicating pipe 63 is communicated with the bottom end of the second air inlet pipe 62 and is used for feeding air into the second air inlet pipe 62;

the diameter of the bottom edge of the air guide sleeve 61 is 1/2-3/4 of the inner diameter of the drying cylinder 60.

After having installed parts such as kuppe 61 additional, the desiccator uses and becomes a little more complicated, but the effect is better, intake pipe 50 drives the metal powder rotation, kuppe 61 gives vent to anger inclination little and intake pipe 50, make the metal powder have more dwell time at the drying can, in addition, because it is the toper to be kuppe 61, and inside has the air current, make the actual flow space of metal powder more down less, that is to say that the lower part gas flow velocity of drying can 60 is faster, on the one hand, convenient row's material, on the other hand velocity of flow increases, drying rate accelerates.

Through the test, the longitudinal distance between the bottom surface of the ultrasonic vibration screen 30 and the top end of the place where the air inlet pipe 50 is communicated with the drying cylinder 60 is 1/10-1/8 of the longitudinal length of the drying cylinder 60.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.