CN209763643U - vacuum drier - Google Patents

Abstract

The utility model relates to a vacuum drier, which comprises a shell, a cover body, a lifting mechanism, a feeding mechanism, a discharging mechanism and a plurality of infrared heaters, the feeding mechanism and the discharging mechanism are respectively positioned at the left side and the right side of the shell, an upper cavity and a lower cavity are arranged in the shell, the plurality of infrared heaters are uniformly arranged on the inner wall of the upper cavity, the lifting mechanism comprises a base, two vibrating motors, a take-up pan, a central column and a plurality of spiral disks, the base is arranged in the lower chamber, the two vibrating motors are arranged on the front side and the rear side of the base, the bottom end of the central column penetrates through the heat insulation partition plate to be fixedly connected with the base, the take-up pan is sleeved on the lower section of the central column, the spiral discs are continuously welded on the central column, a discharge conveying groove extending rightwards is formed in the upper section of the central column, and a discharge hole is formed in the bottom of the discharge conveying groove. The utility model has the advantages of low energy consumption, low noise, high reliability, easy cleaning, high production efficiency, long service life and the like.

Description

Vacuum drier

Technical Field

The utility model relates to a vacuum drying machine belongs to the mechanical equipment field.

Background

At present, hot air drying is mostly adopted in the existing drying machines, materials enter a stock bin in a material sucking mode through a material sucking machine, the materials are dried through a hot air blowing mode in the whole stock bin, and drying is completed within a certain circulation time. This drying method has the following disadvantages: hot material makes the conveying pipeline inner wall appear the wire drawing phenomenon easily through inhaling material mode circulation to influence the material quality, increase the clearance degree of difficulty, and when the material moisture content requirement was higher, need very long cycle time, lead to its energy consumption height, the entire system noise is also great. The utility model patent application for patent No. 201420163023.X discloses a continuous vibration promotes vacuum drying machine, adopts single cover heat-conducting medium heating material that presss from both sides, and pressurize heat preservation cover and pendulum are integrative vibration mode, and it has following several defects: firstly, a hose is needed for heating a medium, the hose is connected with a vibrating device, the hose needs to be periodically maintained and replaced, the sealing structure of the pressure maintaining and heat insulating cover is complex and is in a vibrating state, and the pressure maintaining performance is poor; secondly, the butt joint of the material inlet and outlet of the equipment needs flexible connection with temperature resistance, vibration resistance and pressure resistance, the reliability is poor, and the equipment needs to be replaced periodically. Therefore, it is important to find a vacuum dryer with low energy consumption, low noise, easy cleaning, high production efficiency, high reliability and long service life.

Disclosure of Invention

An object of the utility model is to overcome above-mentioned not enough, provide a vacuum drying machine that the energy consumption is low, the noise is little, the reliability is high, easily clearance, improve the material quality, improve production efficiency, increase of service life.

The purpose of the utility model is realized like this: a vacuum dryer comprises a shell, a cover body, a lifting mechanism, a feeding mechanism, a discharging mechanism and a plurality of infrared heaters, wherein the top of the shell is fixedly connected with the bottom of the cover body, the lifting mechanism is arranged in the shell, the feeding mechanism and the discharging mechanism are respectively positioned on the left side and the right side of the shell, a heat insulation partition plate is arranged at the lower section of an inner cavity of the shell, the inner cavity of the shell is divided into an upper chamber and a lower chamber by the heat insulation partition plate, and the infrared heaters are uniformly arranged on the inner wall of the upper chamber;

The lifting mechanism comprises a base, a plurality of support columns, two vibrating motors, a receiving disc, a central column and a plurality of spiral discs, wherein the base, the support columns and the vibrating motors are arranged in a lower cavity, the support columns surround the base, the two vibrating motors are arranged on the base and are respectively positioned on the front side and the rear side of the base, the central column, the receiving disc and the spiral discs are arranged in the upper cavity, the bottom end of the central column penetrates through a heat insulation partition plate to be fixedly connected with the base, the receiving disc is sleeved on the lower section of the central column, the spiral discs are positioned above the receiving disc and are continuously welded on the central column, the bottom of each spiral disc is provided with an electric heating jacket, the upper section of the central column is provided with a discharge conveying groove extending rightwards, the bottom of the discharge conveying groove is provided with a discharge port, and a joint of the first spiral disc arranged from top to bottom, the joint of the last spiral disc is connected with the take-up pan.

Further, feed mechanism includes feeding buffer hopper, feeding buffer hopper passes through support fixed mounting on the outer wall of casing, the upper segment and the hypomere of the lateral wall of feeding buffer hopper are provided with first charge level detection meter and second charge level detection meter respectively, the top of feeding buffer hopper is provided with the feed inlet that upwards extends, the hypomere of feed inlet is provided with first pneumatic butterfly valve, be connected through first pipeline between the bottom of feeding buffer hopper and the hypomere of last cavity, and the inner of first pipeline stretches into in the cavity and is located the top of take-up (stock) pan, be provided with the pneumatic butterfly valve of second on the connecting end of first pipeline and feeding buffer hopper.

Furthermore, the discharging mechanism comprises a discharging buffer hopper, the discharging buffer hopper is fixedly arranged on the outer wall of the shell through a support, the upper section and the lower section of the side wall of the discharging buffer hopper are respectively provided with a third material level detector and a fourth material level detector, the top of the discharging buffer hopper is connected with the upper section of the upper chamber through a second conveying pipeline, the inner end of the second conveying pipeline extends into the upper chamber and is positioned right below the discharging port, the second conveying pipeline is positioned on the outer section of the upper chamber and is provided with a third pneumatic butterfly valve, the bottom of the discharging buffer hopper is connected with the lower section of the upper chamber through a third conveying pipeline, the inner end of the third conveying pipeline extends into the upper chamber and is positioned above the material receiving disc, a fourth pneumatic butterfly valve is arranged at the connecting end of the third conveying pipeline and the discharging buffer hopper, and the lower section of the discharging buffer hopper is connected with a fourth conveying pipeline, and a fifth pneumatic butterfly valve is arranged on the fourth conveying pipeline, and the outer end of the fourth conveying pipeline is used as a discharge hole.

Furthermore, a cooling water jacket is arranged on the side wall of the lower cavity in a surrounding manner, a cooling water inlet pipe and a cooling water outlet pipe are arranged on the cooling water jacket, the cooling water inlet pipe is located at the lower portion of the lower cavity, and the cooling water outlet pipe is located at the upper portion of the lower cavity.

Furthermore, a damping spring penetrating through the heat insulation partition plate is arranged between the bottom of the material receiving disc and the top of the support column.

furthermore, a plurality of reinforcing ribs which are vertically arranged are arranged on the outer edges of the spiral disks.

further, the two vibration motors are arranged obliquely and opposite to each other.

Furthermore, the second conveying pipeline is provided with a first temperature sensor on the outer section of the upper chamber, and second temperature sensors are arranged on the side walls of the upper chamber and the lower chamber.

Furthermore, a visual window is arranged between the third level detector and the fourth level detector.

Compared with the prior art, the beneficial effects of the utility model are that:

1. The utility model relates to a vacuum drier, be provided with the design of closed business turn over material mechanism and totally closed pressurize heat preservation cover, utilize the super big heat transfer area of electric heat vibration spiral disc, infrared heating mode and the quick dehumidification principle under the vacuum condition to realize high-efficient drying, its heat transfer effect is better, heating efficiency is faster, and carry the circulation material through spiral hoisting mechanism, its energy consumption is low, the noise is little, can avoid pipeline to appear the wire drawing phenomenon, improve the material quality, still can set for different cycle times according to different moisture content requirements, thereby effectively reduce the moisture content of material;

2. The bottom of the discharging buffer hopper is added with a reflux function, so that materials can be circularly refluxed and dried in equipment, and the process requirement of longer drying time is met;

3. The shell of the device adopts a detachable structure, is easier to disassemble and assemble than an enclosing structure, and is convenient to clean;

4. The design of the water cooling jacket arranged at the lower cavity shell section of the vibration motor enables the vibration motor to continuously work for a long time, and therefore production efficiency is improved.

Drawings

Fig. 1 is a schematic structural diagram of the vacuum dryer of the present invention.

Fig. 2 is a top view of the vacuum dryer of the present invention.

Wherein:

Housing 1, upper chamber 1.1, lower chamber 1.2

Cover body 2

Lifting mechanism 3, base 3.1, support column 3.2, vibrating motor 3.3, take-up (stock) pan 3.4, center post 3.5, spiral disc 3.6, damping spring 3.7, strengthening rib 3.8, ejection of compact conveyer trough 3.9, drain hole 3.10

Feed mechanism 4, feeding buffer hopper 4.1, feed inlet 4.2, first pneumatic butterfly valve 4.3, second pneumatic butterfly valve 4.4, first material level detector 4.5, first pipeline 4.6, second material level detector 4.7

the device comprises a discharging mechanism 5, a discharging buffer hopper 5.1, a third material level detector 5.2, a second conveying pipeline 5.3, a visual window 5.4, a first temperature sensor 5.5, a third pneumatic butterfly valve 5.6, a third conveying pipeline 5.7, a fourth pneumatic butterfly valve 5.8, a fourth conveying pipeline 5.9, a fifth pneumatic butterfly valve 5.10 and a fourth material level detector 5.11

heat insulation partition plate 6

Cooling water inlet pipe 7

cooling water outlet pipe 8

Infrared heater 9

First vacuum pumping port 10

second vacuum pumping port 11

Vacuum pressure gauge 12

Third vacuum pumping port 13

second temperature sensor 14

And a terminal 15.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

referring to fig. 1-2, the utility model relates to a vacuum dryer, which comprises a housing 1, a cover 2, a lifting mechanism 3, a feeding mechanism 4, a discharging mechanism 5 and a plurality of infrared heaters 9, wherein the housing 1 adopts a detachable structure, the top of the housing 1 is fixedly connected with the bottom of the cover 2, the lifting mechanism 3 is arranged in the housing 1, the feeding mechanism 4 and the discharging mechanism 5 are respectively arranged at the left and right sides of the housing 1, the lower section of the inner cavity of the housing 1 is provided with a heat insulation partition plate 6, the heat insulation partition plate 6 divides the inner cavity of the housing 1 into an upper cavity 1.1 and a lower cavity 1.2, the plurality of infrared heaters 9 are uniformly arranged on the inner wall of the upper cavity 1.1, the side wall of the lower cavity 1.2 is surrounded by a cooling water jacket, the cooling water jacket is provided with a cooling water inlet pipe 7 and a cooling water outlet pipe 8, the cooling water inlet pipe 7 is positioned at the lower part of the lower cavity 1.2, and the cooling water outlet pipe 8 is positioned at the upper part of the lower cavity 1.2;

The lifting mechanism 3 comprises a base 3.1, four support columns 3.2, two vibrating motors 3.3, a material receiving disc 3.4, a central column 3.5 and a plurality of spiral discs 3.6, the base 3.1, the four support columns 3.2 and the two vibrating motors 3.3 are arranged in a lower cavity 1.2, the four support columns 3.2 are arranged around the base 3.1, the two vibrating motors 3.3 are arranged on the base 3.1 and are respectively positioned at the front side and the rear side of the base 3.1, the two vibrating motors 3.3 are obliquely arranged and have opposite slants, the central column 3.5, the material receiving disc 3.4 and the spiral discs 3.6 are arranged in an upper cavity 1.1, the bottom end of the central column 3.5 penetrates through a heat insulation partition plate 6 to be fixedly connected with the base 3.1, the material receiving disc 3.4 is sleeved at the lower section of the central column 3.5, a damping spring 3.7 penetrating through the heat insulation partition plate 6 is arranged between the bottom of the material receiving disc 3.4 and the top of the support columns 3.2, the spiral discs 3.6 are positioned above the, a plurality of spiral discs 3.6 are continuously welded on a central column 3.5, a plurality of reinforcing ribs 3.8 which are vertically arranged are arranged on the outer edge of each spiral disc 3.6, an electric heating jacket is arranged at the bottom of each spiral disc 3.6, a discharging conveying groove 3.9 which extends rightwards is arranged at the upper section of each central column 3.5, a discharging opening 3.10 is arranged at the bottom of each discharging conveying groove 3.9, a connector of the first spiral disc 3.6 arranged from top to bottom is connected with the discharging conveying groove 3.9, and a connector of the last spiral disc 3.6 is connected with a material receiving plate 3.4;

The feeding mechanism 4 comprises a feeding buffer hopper 4.1, the feeding buffer hopper 4.1 is fixedly arranged on the outer wall of the shell 1 through a support, a first material level detector 4.5 and a second material level detector 4.7 are respectively arranged at the upper section and the lower section of the side wall of the feeding buffer hopper 4.1, the first material level detector 4.5 is used for detecting whether a material reaches the high material level of the feeding buffer hopper 4.1, the second material level detector 4.7 is used for detecting whether the material reaches the low material level of the feeding buffer hopper 4.1, the top of the feeding buffer hopper 4.1 is provided with an upward extending feeding port 4.2, the lower section of the feeding port 4.2 is provided with a first pneumatic butterfly valve 4.3, the bottom of the feeding buffer hopper 4.1 is connected with the lower section of the upper chamber 1.1 through a first conveying pipeline 4.6, the inner end of the first conveying pipeline 4.6 extends into the upper chamber 1.1 and is positioned above the material receiving plate 3.4, and the second pneumatic butterfly valve 4.4 is arranged at the upper end of the first conveying pipeline 4.6 and the feeding buffer hopper 4.1;

The discharging mechanism 5 comprises a discharging buffer hopper 5.1, the discharging buffer hopper 5.1 is fixedly arranged on the outer wall of the shell 1 through a bracket, the upper section and the lower section of the side wall of the discharging buffer hopper 5.1 are respectively provided with a third material level detector 5.2 and a fourth material level detector 5.11, the third material level detector 5.2 is used for detecting whether the material reaches the high material level of the discharging buffer hopper 5.1, the fourth material level detector 5.11 is used for detecting whether the material reaches the low material level of the discharging buffer hopper 5.1, a visible window 5.4 is arranged between the third material level detector 5.2 and the fourth material level detector 5.11, the top of the discharging buffer hopper 5.1 is connected with the upper section of the upper chamber 1.1 through a second conveying pipeline 5.3, the inner end of the second conveying pipeline 5.3 extends into the upper chamber 1.1 and is positioned under the discharging port 3.10, a first temperature sensor 5.5.6.6 and a third butterfly valve are arranged on the outer section of the upper chamber 1.1 of the second conveying pipeline 5.3, the bottom of the discharging buffer hopper 5.1 is connected with the lower section of the upper chamber 1.1 through a third conveying pipeline 5.7, the inner end of the third conveying pipeline 5.7 extends into the upper chamber 1.1 and is positioned above the receiving disc 3.4, a fourth pneumatic butterfly valve 5.8 is arranged at the connecting end of the third conveying pipeline 5.7 and the discharging buffer hopper 5.1, a fourth conveying pipeline 5.9 is connected with the lower section of the discharging buffer hopper 5.1, the fourth conveying pipeline 5.9 is arranged in a 'v' -shaped inclined manner, a fifth pneumatic butterfly valve 5.10 is arranged on the fourth conveying pipeline 5.9, and the outer end of the fourth conveying pipeline 5.9 is used as a discharging port;

The top of the feeding buffer hopper 4.1 is also provided with a first vacuum pumping hole 10;

The top of the discharging buffer hopper 5.1 is also provided with a second vacuum pumping hole 11 and a vacuum pressure gauge 12;

the upper section of the upper cavity 1.1 is provided with a third vacuum pumping hole 13;

the side walls of the upper chamber 1.1 and the lower chamber 1.2 are both provided with a second temperature sensor 14;

the lower section of the lower chamber 1.2 is provided with outwardly extending terminals 15.

A production method of a vacuum drier comprises the following specific operations:

Step one, preheating

Respectively starting an electric heating jacket and an infrared heater, wherein the heating power of the electric heating jacket is 22-28kw, and the heating power of the infrared heater is 22-28kw, so that the heating temperature is 115-125 ℃;

Step two, feeding

Closing the second pneumatic butterfly valve, opening the first pneumatic butterfly valve, pouring the material with the initial water content of 1.5-4% from the feeding hole, closing the first pneumatic butterfly valve to stop feeding when the material reaches the high material level of the feeding buffer hopper, and preparing for blanking and drying;

step three, drying

Opening the lifting mechanism, conveying cooling water in a cooling water jacket of the lower chamber, opening a vacuum pump, wherein the power of the vacuum pump is 2-4kw, when the internal vacuum degree reaches-0.05 to-0.10 Mpa, opening a second pneumatic butterfly valve for blanking, enabling the materials to uniformly flow into a material receiving disc of the lifting mechanism, enabling the materials to gradually climb upwards into a discharging conveying groove along the conveying track direction of the lifting mechanism due to the action of a vibrating motor, falling into a second conveying pipeline through a discharging opening and flowing into a discharging buffer hopper, closing the second pneumatic butterfly valve to stop blanking when the materials reach the high material level of the discharging buffer hopper, opening a fourth pneumatic butterfly valve, enabling the materials in the discharging buffer hopper to flow into the material receiving disc again through a third conveying pipeline, gradually climbing upwards into the discharging conveying groove along the conveying track direction of the lifting mechanism, and falling into the second conveying pipeline through the discharging opening, the materials sequentially pass through a discharging buffer hopper and a third conveying pipeline, are circulated for multiple times according to the conveying track, after the circulation is carried out for a period of time, a first pneumatic butterfly valve is opened, the materials are replenished to the feeding buffer hopper, the drying circulation is carried out for 1.2-2.5 hours, and when the water content of the materials is 0.02-0.18%, the materials are ready to be discharged;

Step four, unloading

Closing the fourth pneumatic butterfly valve, conveying the material into a discharging buffer hopper through a lifting mechanism, closing the third pneumatic butterfly valve and the lifting mechanism when the material reaches the high material level of the discharging buffer hopper, closing the vacuum, opening the fifth pneumatic butterfly valve for discharging when the inside of the discharging buffer hopper recovers the normal pressure, closing the fifth pneumatic butterfly valve when the material in the discharging buffer hopper reaches the low material level, opening the third pneumatic butterfly valve, simultaneously opening the vacuum, opening the second pneumatic butterfly valve for discharging when the inside vacuum degree meets the drying vacuum degree, and repeating the third step to enable the feeding, drying and discharging to be continuously carried out in batches.

Example one

First, preheating

Respectively starting an electric heating jacket and an infrared heater, wherein the heating power of the electric heating jacket is 25kw, and the heating power of the infrared heater is 25kw, so that the heating temperature is 120 ℃;

step two, feeding

Closing the second pneumatic butterfly valve, opening the first pneumatic butterfly valve, pouring 1000kg of PA6 slices from the feed inlet in batches, wherein the initial water content is 3%;

Step three, drying

Starting a lifting mechanism, conveying cooling water into a cooling water jacket of a lower cavity, starting a vacuum pump, starting blanking when the power of the vacuum pump is 2.2kw, and when the internal vacuum degree reaches-0.07 Mpa, performing drying circulation for 1.5h, wherein the thermal efficiency is 90%;

Step four, unloading

And closing the third pneumatic butterfly valve, the lifting mechanism and the vacuum pump, and unloading when the interior recovers to the normal pressure, wherein the water content of the PA6 slice at the moment is 0.15%.

Example two

First, preheating

Respectively starting an electric heating jacket and an infrared heater, wherein the heating power of the electric heating jacket is 25kw, and the heating power of the infrared heater is 25kw, so that the heating temperature is 120 ℃;

step two, feeding

Closing the second pneumatic butterfly valve, opening the first pneumatic butterfly valve, pouring 1000kg of PET chips from the feeding hole in batches, wherein the initial water content is 2%;

Step three, drying

Starting a lifting mechanism, conveying cooling water into a cooling water jacket of a lower cavity, starting a vacuum pump, starting blanking when the power of the vacuum pump is 3.7kw, and starting a drying cycle for 3 hours when the internal vacuum degree reaches-0.08 Mpa, wherein the thermal efficiency is 90%;

Step four, unloading

And closing the third pneumatic butterfly valve, the lifting mechanism and the vacuum pump, unloading when the interior recovers to the normal pressure, wherein the water content of the PET polyester chip at the moment is 0.03%.

EXAMPLE III

first, preheating

respectively starting an electric heating jacket and an infrared heater, wherein the heating power of the electric heating jacket is 25kw, and the heating power of the infrared heater is 25kw, so that the heating temperature is 120 ℃;

Step two, feeding

Closing the second pneumatic butterfly valve, opening the first pneumatic butterfly valve, and pouring 1000kg of calcium carbonate filling master batch from the feeding hole in batches, wherein the initial water content of the master batch is 2%;

step three, drying

starting a lifting mechanism, conveying cooling water into a cooling water jacket of a lower cavity, starting a vacuum pump, wherein the power of the vacuum pump is 3.7kw, starting blanking when the internal vacuum degree reaches-0.08 Mpa, and performing drying circulation for 1.8h, wherein the thermal efficiency is 90%;

Step four, unloading

and closing the third pneumatic butterfly valve, the lifting mechanism and the vacuum pump, and unloading when the interior recovers to the normal pressure, wherein the water content of the calcium carbonate filling master batch at the moment is 0.1%.

The utility model relates to a performance contrast of vacuum drying machine and conventional dehumidification desiccator as follows:

the above is only a specific application example of the present invention, and does not constitute any limitation to the protection scope of the present invention. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.

Claims (9)

1. A vacuum drier is characterized in that: the solar energy heat collecting device comprises a shell (1), a cover body (2), a lifting mechanism (3), a feeding mechanism (4), a discharging mechanism (5) and a plurality of infrared heaters (9), wherein the top of the shell (1) is fixedly connected with the bottom of the cover body (2), the lifting mechanism (3) is arranged in the shell (1), the feeding mechanism (4) and the discharging mechanism (5) are respectively positioned at the left side and the right side of the shell (1), a heat insulation partition plate (6) is arranged at the lower section of an inner cavity of the shell (1), the inner cavity of the shell (1) is divided into an upper cavity (1.1) and a lower cavity (1.2) by the heat insulation partition plate (6), and the infrared heaters (9) are uniformly arranged on the inner wall of the upper cavity (1.1);

The lifting mechanism (3) comprises a base (3.1), a plurality of support columns (3.2), two vibrating motors (3.3), a take-up (3.4), a central column (3.5) and a plurality of spiral discs (3.6), the base (3.1), the support columns (3.2) and the vibrating motors (3.3) are arranged in a lower cavity (1.2), the support columns (3.2) are arranged around the base (3.1), the two vibrating motors (3.3) are arranged on the base (3.1) and are respectively positioned at the front side and the rear side of the base (3.1), the central column (3.5), the take-up (3.4) and the spiral discs (3.6) are arranged in an upper cavity (1.1), the bottom end of the central column (3.5) penetrates through a partition plate (6) to be fixedly connected with the base (3.1), the take-up (3.4) is sleeved on the lower section of the disc, and the spiral discs (3.6) are positioned above the take-up (3.4), and a plurality of spiral discs (3.6) are continuously welded on the central column (3.5), the bottom of each spiral disc (3.6) is provided with an electric heating jacket, the upper section of the central column (3.5) is provided with a discharging conveying groove (3.9) extending rightwards, the bottom of each discharging conveying groove (3.9) is provided with a discharging hole (3.10), the joint of the first spiral disc (3.6) arranged from top to bottom is connected with the discharging conveying groove (3.9), and the joint of the last spiral disc (3.6) is connected with the material receiving disc (3.4).

2. a vacuum dryer according to claim 1, wherein: the feeding mechanism (4) comprises a feeding buffer hopper (4.1), the feeding buffer hopper (4.1) is fixedly arranged on the outer wall of the shell (1) through a bracket, the upper section and the lower section of the side wall of the feeding buffer hopper (4.1) are respectively provided with a first material level detector (4.5) and a second material level detector (4.7), the top of the feeding buffer hopper (4.1) is provided with a feeding hole (4.2) extending upwards, a first pneumatic butterfly valve (4.3) is arranged at the lower section of the feeding port (4.2), the bottom of the feeding buffer hopper (4.1) is connected with the lower section of the upper chamber (1.1) through a first conveying pipeline (4.6), and the inner end of the first conveying pipeline (4.6) extends into the upper chamber (1.1) and is positioned above the receiving disc (3.4), and a second pneumatic butterfly valve (4.4) is arranged at the connecting end of the first conveying pipeline (4.6) and the feeding buffer hopper (4.1).

3. A vacuum dryer according to claim 1, wherein: the discharging mechanism (5) comprises a discharging buffer hopper (5.1), the discharging buffer hopper (5.1) is fixedly installed on the outer wall of the shell (1) through a support, the upper section and the lower section of the side wall of the discharging buffer hopper (5.1) are respectively provided with a third material level detection meter (5.2) and a fourth material level detection meter (5.11), the top of the discharging buffer hopper (5.1) and the upper section of the upper chamber (1.1) are connected through a second conveying pipeline (5.3), the inner end of the second conveying pipeline (5.3) extends into the upper chamber (1.1) and is positioned under a discharging port (3.10), the second conveying pipeline (5.3) is positioned on the outer section of the upper chamber (1.1) and is provided with a third pneumatic butterfly valve (5.6), the bottom of the discharging buffer hopper (5.1) and the lower section of the upper chamber (1.1) are connected through a third conveying pipeline (5.7), and the inner end of the third conveying pipeline (5.7) extends into the upper chamber (1.1.1) and is positioned above the charging port (3.10), the pneumatic material discharging device is characterized in that a fourth pneumatic butterfly valve (5.8) is arranged at the connecting end of the third conveying pipeline (5.7) and the material discharging buffer hopper (5.1), a fourth conveying pipeline (5.9) is connected to the lower section of the material discharging buffer hopper (5.1), a fifth pneumatic butterfly valve (5.10) is arranged on the fourth conveying pipeline (5.9), and the outer end of the fourth conveying pipeline (5.9) serves as a material discharging hole.

4. a vacuum dryer according to claim 1, wherein: the cooling water jacket is arranged on the side wall of the lower cavity (1.2) in an enclosing mode, a cooling water inlet pipe (7) and a cooling water outlet pipe (8) are arranged on the cooling water jacket, the cooling water inlet pipe (7) is located on the lower portion of the lower cavity (1.2), and the cooling water outlet pipe (8) is located on the upper portion of the lower cavity (1.2).

5. A vacuum dryer according to claim 1, wherein: and a damping spring (3.7) penetrating through the heat insulation partition plate (6) is arranged between the bottom of the take-up pan (3.4) and the top of the support column (3.2).

6. A vacuum dryer according to claim 1, wherein: the outer edges of the spiral disks (3.6) are provided with a plurality of reinforcing ribs (3.8) which are vertically arranged.

7. a vacuum dryer according to claim 1, wherein: the two vibration motors (3.3) are obliquely arranged and are opposite in oblique direction.

8. A vacuum dryer according to claim 3, wherein: the second conveying pipeline (5.3) is provided with a first temperature sensor (5.5) on the outer section of the upper chamber (1.1), and second temperature sensors (14) are arranged on the side walls of the upper chamber (1.1) and the lower chamber (1.2).

9. A vacuum dryer according to claim 3, wherein: a visual window (5.4) is arranged between the third material level detecting meter (5.2) and the fourth material level detecting meter (5.11).