CN102183126B - Rake type vacuum drying system - Google Patents

Abstract

The invention provides a rake type vacuum drying system, which comprises a rake type vacuum drying host machine, a bag type filter, a condenser, a gas-liquid separator, a vacuum pump, an oil pump and a hot oil tank, wherein a main shaft of the rake type vacuum drying host machine is a solid main shaft; a plurality of rake tooth components are arranged on the main shaft; each rake tooth component comprises a sleeve shaft and four solid rake teeth uniformly distributed on the sleeve shaft in a fixed manner, and is connected on the main shaft through a sleeve shaft key; the rake teeth of the respective rake tooth components face towards the same direction, so that four passageways are formed in a tank body; and striking rods are respectively arranged in respective passageways or in spaced passageways. In the invention, materials inside the tank body of the drying host machine are struck continuously by using the striking rods, so that the crushing of the materials is accelerated, the materials can obtain larger specific surface areas, the drying process is accelerated, and finished products have uniform fineness and low water content; thus, the rake type vacuum drying system is suitable for drying lithium iron phosphate materials, and the product quality and drying efficiency are improved; moreover, the system is used for recovering solvents through the condenser and the gas-liquid separator, and is beneficial to reduction of the cost.

Description

Rake vacuum drying system

technical field

The present invention relates to a rake type vacuum drying system.

Background technique

The rake vacuum dryer is a general-purpose drying equipment. The rake vacuum dryer is a device that uses the characteristic that the boiling point of the water in the material decreases under vacuum to dry. The equipment is indirectly heated with a steam jacket, and the water is evaporated by heating and extracted in time. Inside the dryer shell, the rake teeth are driven by the transmission shaft. The end of the rake teeth and the axis are designed to have a certain angle. The transmission shaft rotates in the forward and reverse directions to move the material along the axial direction to facilitate drying and discharging. The Chinese Invention Patent Publication No. 101050916A discloses a rake dryer, which mainly adopts a hollow main shaft to be installed in the inner cylinder of the tank. The two ends of the hollow main shaft are respectively equipped with bearing housings. The rolling self-aligning bearings in the bearing housings support the hollow main shaft. The rotary joint is installed on the hollow main shaft. one end. The above-mentioned rake vacuum dryer is not suitable for drying lithium iron phosphate materials. This is due to the poor fluidity of lithium iron phosphate suspended materials. When drying, the materials change from liquid to paste to powder, and the shape of the materials changes greatly. If it is sticky, the working resistance of the rake teeth is very high. For example, the rake rod and the rake teeth are not strong enough, and they are easy to bend and break during the drying process. Moreover, the current welding between the hollow rake rod and the hollow main shaft causes a large deformation of the main shaft and the rake rod. When the main shaft drives the rake teeth to rotate, the gap between the head of the rake teeth and the inner wall of the tank is uneven. Affect the crushing effect, resulting in uneven product fineness. In addition, the finished products unloaded from the rake vacuum dryer need to be transferred to another special equipment for cooling. Lithium iron phosphate products have high requirements for moisture and purity, and are prone to moisture absorption and contamination during transportation.

Contents of the invention

The object of the present invention is to propose a rake-type vacuum drying system with good fineness uniformity of the finished product.

To achieve the above object, the present invention takes the following technical solutions:

The rake-type vacuum drying system proposed by the present invention has a rake-type vacuum drying host, a vacuum pump, an oil pump and a thermal oil tank. The thermal oil tank is provided with a thermal oil tank oil delivery pipe and a thermal oil tank oil return pipe. Saddle-type base, jacketed tank body set on the saddle-type base and the main shaft in the tank body, the top of the tank body is equipped with a vacuum tube, the top feeding port is connected with a material port cover, and the bottom discharge port is equipped with a discharge port. A set of circulating oil pipes are installed on both sides of the jacket of the tank body along the direction of the main shaft, oil inlet pipes connected to the inlets of the corresponding circulating oil pipes are respectively provided on both sides of the bottom of the tank body, and oil inlet pipes are respectively provided on both sides of the upper part of the tank body. The oil return pipe connected to the outlet of the corresponding circulating oil pipe, the end caps at both ends of the tank are connected with bearing seat assemblies, the bearings in the two bearing seat assemblies support the above-mentioned main shaft, the output shaft of the reduction box is connected with the above-mentioned main shaft, and the oil delivery pipe of the hot oil tank is connected to the above-mentioned main shaft. The oil pump is connected to the oil pump, the oil pump is connected to the oil inlet pipe of the rake vacuum drying host, and the oil return pipe of the rake vacuum drying host is connected to the oil return pipe of the hot oil tank; this system is also equipped with a bag filter, a condenser, and a gas-liquid separator. The vacuum tube of the rake-type vacuum drying host is connected to the air inlet of the bag filter through the first connecting pipe, and the exhaust port of the bag filter is connected to the air inlet of the condenser through the second connecting pipe , the exhaust port of the condenser is connected with the air inlet of the gas-liquid separator through the third connecting pipe, and the exhaust port of the gas-liquid separator is connected with the vacuum pump through the fourth connecting pipe; the main shaft is a solid main shaft , there are several rake tooth parts on the main shaft, each rake tooth part is composed of a sleeve shaft and four solid rake teeth evenly distributed and fixed on the sleeve shaft, each rake tooth part is connected to the main shaft through a sleeve shaft key, each rake tooth part The tines of the rakes face the same direction, thereby forming four channels in the tank, and a knocking rod is placed in each channel or in an interval channel.

The percussion rod is a hollow percussion rod with both ends blocked.

A manhole with a length greater than 1/2 of the length of the tank is provided on the top of the tank body of the rake-type vacuum drying main engine, and the feeding port is arranged on the manhole cover plate.

The unloading device of the rake-type vacuum drying host includes an unloading hopper, which is provided with a unloading shaft supported by a pair of bearing seats. The unloading shaft is connected to the material door through a connecting rod, and one end of the unloading shaft extends out of the unloading hopper. A worm gear is fixed on the extended end of the discharge shaft, and a hand wheel is connected to one end of the worm meshed with the worm gear.

The two bearing housing components of the rake vacuum drying host are composed of bearing housings, bearings arranged in the bearing housings and sealing sleeves connected between the end covers and the bearing housings.

The sealing sleeve of the bearing seat assembly is provided with a packing seat fixed on the end cover, and the packing seat is provided with a packing sleeved on the main shaft, and the opening of the packing seat is threadedly connected with a parallel cap that compresses the packing. the

The system is also equipped with a transfer oil tank and a cold oil tank. The transfer oil tank is provided with a transfer oil tank oil delivery pipe and a transfer oil tank return pipe. The cold oil tank is provided with a cold oil tank oil delivery pipe and a cold oil tank return pipe. On the oil delivery pipe of the hot oil tank, the oil return pipe of the transfer oil tank and the oil return pipe of the cold oil tank are connected with the oil return pipe of the rake-type vacuum drying host.

The tank body of the gas-liquid separator is provided with a middle partition, and the tank inner cavity is divided into two chambers, and the corresponding two chambers on the tank body are respectively provided with an air inlet, an exhaust port, a fresh air inlet and a liquid discharge port. The condenser is connected to the two inlets of the gas-liquid separator through the third connecting pipe, and the two exhaust ports of the gas-liquid separator are connected to the vacuum pump through the fourth connecting pipe.

The condenser is a spiral plate condenser.

The condenser is stacked above the gas-liquid separator through a bracket.

The present invention has the following positive effects: 1. Add 2 or 4 knocking rods in the tank of the rake-type vacuum drying main machine, which continuously knocks the material inside, accelerates the crushing of the material, and makes the material obtain a larger specific surface area. It is more conducive to the discharge of moisture on the surface of the material, thereby accelerating the drying process, making the finished product uniform in fineness and low in moisture, suitable for drying lithium iron phosphate materials, not only improving product quality, but also improving drying efficiency. The system recovers the solvent through the condenser and the gas-liquid separator, and reuses the solvent, which is beneficial to reduce the cost. 2. The rake-type vacuum drying host adopts a solid main shaft and solid rake teeth. The good rigidity of the solid main shaft and solid rake teeth can withstand the greater resistance caused by turning viscous materials and the vibration of the percussion rod, which can ensure the stability of the drying process. conduct. 3. The rake-type vacuum drying host is connected to the main shaft by the rake tooth parts, which brings convenience for processing, assembly and disassembly. 4. This system is also equipped with a cold oil tank. After the material is dried, the cold oil provided by the cold oil tank is input into the jacket of the cylinder of the double-cone rotary vacuum drying host to cool the material, and it is directly completed in the double-cone rotary vacuum drying host. Cool to ensure the purity of the product. This system has a transfer oil tank to reuse the waste heat of hot oil, which has the effect of saving energy. 5. The present invention adopts a spiral plate condenser, which has a strong heat exchange effect and also has an energy saving effect. 6. The gas-liquid separator of the present invention adopts a horizontal type, which reduces the installation height of the equipment. The condenser is stacked above the gas-liquid separator through a bracket, which occupies a small area, and the condenser adopts the design of one tank and two chambers. The solvent is collected in turn and the material is discharged in turn, so that the system can work continuously without stopping.

Description of drawings

FIG. 1 is a structural diagram of Embodiment 1.

Fig. 2 is a structural diagram of a rake-type vacuum drying host.

FIG. 3 is a side view of FIG. 2 .

Fig. 4 is a structural view of the bearing seat assembly.

Fig. 5 is a view of the rake tooth parts of the main machine of the rake vacuum drying machine.

Fig. 6 is a schematic view of the unloading device of the rake vacuum drying host.

FIG. 7 is a side view of FIG. 6 .

Fig. 8 is a structural diagram of a gas-liquid separator.

FIG. 9 is a structural diagram of Embodiment 2.

Detailed ways

Example 1

As shown in Figures 1 to 8, a rake vacuum drying system has a rake vacuum drying host 1, a bag filter 2, a condenser 3, a gas-liquid separator 4, a vacuum pump 5, an oil pump 6, and a hot oil tank 7. The hot oil tank 7 is provided with a hot oil tank oil delivery pipe 7-1 and a hot oil tank oil return pipe 7-2.

The rake type vacuum drying host 1 includes a motor 1-21, a reduction box 1-22, a saddle base 1-24, a jacketed tank 1-1 arranged on the saddle base 1-24 and a tank 1 Spindle 1-6 within -1. The output shaft of the reduction box 1-22 is connected with the above-mentioned main shaft 1-6 through a chain drive or a belt drive. the

In order to facilitate maintenance and cleaning, the top of the tank body of the rake vacuum drying main machine 1 is provided with a manhole 1-b with a length greater than 1/2 of the tank body length, and a manhole 1-b that can be quickly opened and closed is provided on the manhole 1-b The cover plate 1-15, the manhole cover plate 1-15 is provided with a feed port 1-a, the feed port 1-a is connected with a feed port cover plate 1-14 that can be opened and closed quickly, and the rake type vacuum drying host 1 Vacuumizing pipe 1-16 is connected on the manhole cover plate 1-15.

A set of circulating oil pipes 1-11 are provided on the left and right sides of the jacket of the tank body 1-1 of the rake-type vacuum drying host 1, and the two sides of the bottom of the tank body 1-1 are respectively provided with inlets of the corresponding circulating oil pipes 1-11. The oil inlet pipe 1-9, and the upper two sides of the tank body 1-1 are respectively provided with an oil return pipe 1-17 connected to the outlet of the corresponding circulating oil pipe 1-11. The end caps 1-1-1 at both ends of the tank body 1-1 are respectively connected with a bearing seat assembly 1-2, and the two bearing seat assemblies 1-2 of the rake vacuum drying host 1 are respectively composed of a bearing seat 1-2-1 1. The bearing 1-2-2 arranged in the bearing seat 1-2-1 and the sealing sleeve 1-2-3 connected between the end cover 1-1-1 and the bearing seat 1-2-1 are composed. The main shaft 1-6 is supported by the bearings 1-2-2 in the two bearing block assemblies 1-2. The sealing sleeve 1-2-3 of the bearing seat assembly 1-2 is provided with a packing seat 1-4 fixed on the end cover, and the packing seat 1-4 is provided with a packing 1-5 set on the main shaft. The opening of the seat 1-4 is threadedly connected with a cap 1-3, and the cap 1-3 is used to compress the filler 1-5 to ensure the tightness of the tank body. The bottom of the tank body of the rake-type vacuum drying host 1 is provided with a discharge port, and a discharge device 1-13 is provided on the discharge port. The unloading device 1-13 of the rake-type vacuum drying host 1 includes an unloading hopper 1-13-1, and the unloading hopper 1-13-1 is provided with an unloading device supported by a pair of bearings in the bearing housing 1-13-2. The material shaft 1-13-3, the discharge shaft 1-13-3 is connected with the material door 1-13-5 through the connecting rod 1-13-4, and one end of the discharge shaft 1-13-3 extends out of the discharge hopper 1-13 -1, the extended end of the discharge shaft 1-13-3 is fixed with a worm wheel 1-13-6, and one end of the worm screw 1-13-7 meshed with the worm wheel 1-13-6 is connected with a hand wheel 1-13- 8, or the worm screw 1-13-7 is connected to the handwheel shaft, and the handwheel 1-13-8 is fixed on the handwheel shaft.

The rake-type vacuum drying host 1 adopts a solid main shaft 1-6, on which there are several rake tooth parts 1-7, and the number of rake tooth parts 1-7 is set according to specific requirements, and each rake tooth part 1 -7 is composed of a sleeve shaft 1-7-1 that is transitionally matched with the main shaft 1-6 and four solid rake teeth 1-7-2 that are uniformly distributed and fixed on the sleeve shaft 1-7-1, and the rake teeth 1-7- 2 includes the rod part 1-7-21 and the head part 1-7-22, between the rod part 1-7-21 and the head part 1-7-22 of the rake teeth and the rake teeth 1-7-2 and the sleeve shaft 1 Welding is used between -7-1. The main shaft 1-6 is provided with a keyway axially penetrating the main shaft 1-6, and each rake tooth part 1-7 is connected to the main shaft 1-6 through the sleeve shaft 1-7-1 key, and each rake tooth part 1-7 The rake teeth 1-7-2 have the same orientation, thereby forming four passages F in the tank body 1-1, and one knocking rod 1-8 is respectively placed in each passage F, that is, four knocking rods 1-8 are arranged. Or the percussion rods 1-8 described in the channel F at intervals, that is, two percussion rods 1-8 are arranged symmetrically, and the root percussion rods 1-8 are hollow thick-walled with substantially the same length as the axial length of the tank inner cavity Stainless steel tube, both ends of the stainless steel tube are sealed. Assuming that the rake teeth rotate clockwise, when the first rake tooth is in the vertical state at the bottom, it pushes the knocking rod 1-8 in front of it to rise along the tank wall. The bat 1-8 slides down along the front of the tine to between the tine and the previous tine, the current tine rotates to a position of 270°, and the knocking stick 1-8 slides down to the back side of the previous tine. When the tank wall is in contact, the knocking rod 1-8 is supported by the back of the previous tine and descends to the lowest point along the tank wall. Push the percussion rod 1-8 to rise along the tank body wall. During this process, the knocking rods 1-8 play the role of scraping the tank body, crushing and turning over the material.

The condenser 3 is stacked above the gas-liquid separator 4 through a bracket 10 . The condenser 3 is a spiral plate condenser, which is available in the market. The condenser 3 has an air inlet 3-1, an air outlet 3-2, a cooling medium inlet 3-3 and a cooling medium outlet. The spiral plate condenser is made of two sheets, forming two uniform spiral channels. The two heat transfer media can flow in full countercurrent, which greatly enhances the heat exchange effect. Can achieve the ideal heat exchange effect. Secondly, the connecting pipe on the casing adopts a tangential structure, and the local resistance is small. Since the curvature of the spiral channel is uniform, the liquid flows in the equipment without a large turn, and the total resistance is small, so the design flow rate can be increased to make it have a higher heat transfer capacity. the

The tank body of the gas-liquid separator 4 is provided with a middle partition 4-1, and the tank inner cavity is divided into two chambers, and the corresponding two chambers on the tank body are respectively provided with an air inlet 4-2, an exhaust port 4-3, Fresh air inlet 4-4 and drain port 4-5 are respectively provided with corresponding air inlets 4-2, exhaust ports 4-3, fresh air inlets 4-4 and drain ports 4-5. valve.

The hot oil tank oil delivery pipe 7-1 on the hot oil tank 7 is connected with the oil pump 6, the oil pump 6 is connected with the oil inlet pipe 1-9 of the rake vacuum drying main machine 1, and the oil return pipe 1-17 of the rake vacuum drying main machine 1 is connected with the oil pump 6. The oil return pipe 7-2 of the hot oil tank is connected. The evacuation pipe 1-16 of the rake type vacuum drying host 1 is connected with the air inlet of the bag filter 2 through the first connecting pipe 11, and the exhaust port of the bag filter 2 is connected with the air inlet of the bag filter 2 through the second connecting pipe 12. The air inlet of the condenser 3 is connected, and the exhaust port of the condenser 3 is connected with the two air inlets 4-2 of the gas-liquid separator 4 through the third connection pipe 13, and the two air inlets 4-2 of the gas-liquid separator 4 are connected. Each exhaust port 4-3 is connected with the vacuum pump 5 through a fourth connecting pipe 14.

The material to be dried is fed from the feeding port in the middle of the top of the tank. Under the agitation of the rake teeth that are constantly rotating forward and backward, the material moves back and forth in the axial direction, and the surface in contact with the inner wall of the tank is constantly renewed. Stirring, the beating rod continuously beats the material inside, so that the material can obtain a larger specific surface area, so that the moisture on the surface of the material can be discharged more favorably, thereby accelerating the drying process and making the quality of the finished material better.

The vaporized moisture is discharged from the outlet of the vacuum pump through the bag filter 2, the condenser 3 and the gas-liquid separator 4.

Example 2

On the basis of Embodiment 1, the present embodiment is also provided with a transfer oil tank 8 and a cold oil tank 9. The transfer oil tank 8 is an insulated oil tank. The transfer oil tank 8 is provided with a transfer oil tank oil delivery pipe 8-1 and a transfer oil tank return pipe 8-2. 9 is provided with a cold oil tank oil delivery pipe 9-1 and a cold oil tank return pipe 9-2, the transfer oil tank oil delivery pipe 8-1 is connected with the hot oil tank 7, the cold oil tank oil delivery pipe 9-1 is connected with the hot oil tank oil delivery pipe 7-1, and the transfer oil tank return oil pipe 8-2 and the oil return pipe 9-2 of the cold oil tank are connected with the oil return pipe 12. Each has a corresponding valve.

When working, the oil pump 6 is turned on, the valve K1 on the oil delivery pipe 8-1 of the transfer oil tank is normally open, the valve K2 on the return oil pipe 7-2 of the hot oil tank, the valve K 3 on the oil delivery pipe 7-1 of the hot oil tank, and the oil supply pipe 11 The valve K 4 of the valve is opened, and the heat transfer oil circulates between the hot oil tank 7 and the jacket 1-a of the double-cone rotary vacuum drying host 1, and the heating system works normally. When the material is cooled, the oil pump 6 is turned on, the valve K5 on the oil delivery pipe 9-1 of the cold oil tank, and the valve K6 on the oil return pipe 8-2 of the transfer oil tank are turned on, the hot oil in the jacket enters the transfer oil tank first, and when a certain amount is reached, the valve K6 is closed , the valve K 7 on the oil return pipe 9-2 of the cold oil tank is opened, and the cooling oil circulates between the cold oil tank 9 and the jacket 1-a of the double-cone rotary vacuum drying host 1 to cool the material. When drying again, the oil in the transfer oil tank 8 enters the hot oil tank 7 for utilization.

In this embodiment, waste heat is utilized by transferring the oil tank, saving energy.

Claims (10)

1. A rake-type vacuum drying system, which has a rake-type vacuum drying host (1), a vacuum pump (5), an oil pump (6) and a thermal oil tank (7), and the thermal oil tank (7) is provided with a thermal oil tank oil delivery pipe (7 -1) and the oil return pipe of the hot oil tank (7-2), the rake type vacuum drying host (1) includes the motor (1-21), the reduction box (1-22), the saddle base (1-24), and is set on the saddle Jacketed tank body (1-1) on the type base (1-24) and the main shaft (1-6) in the tank body (1-1), the top of the tank body (1-1) is provided with a vacuum tube (1-16), the top feed port (1-a) is connected with a feed port cover (1-14), the bottom discharge port is provided with a discharge device (1-13), the tank body (1-1) A set of circulating oil pipes (1-11) are provided on both sides of the jacket along the direction of the main shaft (1-6), and corresponding circulating oil pipes (1-11) are respectively provided on both sides of the bottom of the tank body (1-1) The oil inlet pipe (1-9) connected to the inlet, and the oil return pipe (1-17) connected to the outlet of the corresponding circulating oil pipe (1-11) are respectively provided on both sides of the upper part of the tank body (1-1), and the tank body (1-11) 1) The end covers (1-1-1) at both ends are respectively connected with bearing seat assemblies (1-2), and the bearings (1-2-2) in the two bearing seat assemblies (1-2) support the above-mentioned main shaft (1-2) -6), the output shaft of the reduction box (1-22) is connected to the above-mentioned main shaft (1-6), the oil delivery pipe (7-1) of the hot oil tank is connected to the oil pump (6), and the oil pump (6) is connected to the rake type vacuum drying The oil inlet pipe (1-9) of the main engine (1) is connected, and the oil return pipe (1-17) of the rake vacuum drying main engine (1) is connected with the oil return pipe (7-2) of the hot oil tank; There are bag filters (2), condensers (3), and gas-liquid separators (4). The vacuum tubes (1-16) of the rake-type vacuum drying host (1) pass through the first connecting tube (11) and The air inlet of the bag filter (2) is connected, the exhaust port of the bag filter (2) is connected with the air inlet of the condenser (3) through the second connecting pipe (12), and the condenser The exhaust port of (3) is connected to the air inlet of the gas-liquid separator (4) through the third connecting pipe (13), and the exhaust port of the gas-liquid separator (4) is connected through the fourth connecting pipe (14) It is connected with the vacuum pump (5); the main shaft (1-6) is a solid main shaft, and several rake parts (1-7) are arranged on the main shaft (1-6), and each part (1-7) is composed of The sleeve shaft (1-7-1) and four solid rake teeth (1-7-2) are evenly distributed and fixed on the sleeve shaft (1-7-1), and each rake tooth part (1-7) passes through the sleeve The shaft (1-7-1) is keyed to the main shaft (1-6), and the rake teeth (1-7-2) of each rake tooth part (1-7) face the same direction, so that the tank body (1-1) Four channels (F) are formed inside, and one percussion rod (1-8) is placed in each channel (F) or in an alternate channel (F). 2. The rake-type vacuum drying system according to claim 1, characterized in that: the knocking rod (1-8) is a hollow knocking rod with both ends blocked. 3. The rake-type vacuum drying system according to claim 1, characterized in that: the top of the tank of the rake-type vacuum drying host (1) is provided with a manhole (1-b) whose length is greater than 1/2 of the length of the tank , the feeding port (1-a) is set on the manhole cover plate (1-15). 4. The rake-type vacuum drying system according to claim 1, characterized in that: the unloading device (1-13) of the rake-type vacuum drying host (1) includes a discharge hopper (1-13-1), unloading The hopper (1-13-1) is provided with a discharge shaft (1-13-3) supported by a pair of bearing seats (1-13-2), and the discharge shaft (1-13-3) passes through the connecting rod ( 1-13-4) is connected with the material door (1-13-5), one end of the discharge shaft (1-13-3) protrudes from the discharge hopper (1-13-1), and the discharge shaft (1-13-3 ) is fixed with a worm wheel (1-13-6), and one end of the worm (1-13-7) meshed with the worm wheel (1-13-6) is connected with a handwheel (1-13-8). 5. The rake-type vacuum drying system according to claim 1, characterized in that: the two bearing seat assemblies (1-2) of the rake-type vacuum drying host (1) are each composed of a bearing seat (1-2-1) , the bearing (1-2-2) set in the bearing housing (1-2-1) and the sealing sleeve ( 1-2-3) composition. 6. The rake vacuum drying system according to claim 5, characterized in that: the sealing sleeve (1-2-3) of the bearing seat assembly (1-2) is provided with a packing seat fixed on the end cover (1-4), the packing seat (1-4) is provided with the packing (1-5) sleeved on the main shaft, and the opening of the packing seat (1-4) is threaded to a compression packing (1-5) And caps (1-3). 7. The rake-type vacuum drying system according to claim 1, characterized in that: the system is also equipped with a transfer oil tank (8) and a cold oil tank (9), and the transfer oil tank (8) is provided with a transfer oil tank oil delivery pipe (8-1 ) and transfer oil tank return pipe (8-2), cold oil tank (9) is equipped with cold oil tank oil delivery pipe (9-1) and cold oil tank return pipe (9-2), transfer oil tank oil delivery pipe (8-1) and hot oil tank ( 7) Connection, the oil delivery pipe of the cold oil tank (9-1) is connected to the oil delivery pipe of the hot oil tank (7-1), the oil return pipe of the transfer oil tank (8-2) and the oil return pipe of the cold oil tank (9-2) are connected with the rake Connect the oil return pipe (1-17) of the vacuum drying host (1). 8. The rake-type vacuum drying system according to claim 1, characterized in that: the tank body of the gas-liquid separator (4) is provided with a middle partition (4-1), which divides the inner cavity of the tank into two chambers, The corresponding two chambers on the tank body are respectively provided with an air inlet (4-2), an air outlet (4-3), a fresh air inlet (4-4) and a liquid outlet (4-5), and the condenser ( 3) Connect the two inlets (4-2) of the gas-liquid separator (4) through the third connecting pipe (13), and the two exhaust ports (4-3) of the gas-liquid separator (4) ) is connected to the vacuum pump (5) through the fourth connecting pipe (14). 9. The rake vacuum drying system according to claim 1, characterized in that: the condenser (3) is a spiral plate condenser. 10. The rake-type vacuum drying system according to claim 1, characterized in that: the condenser (3) is stacked above the gas-liquid separator (4) through a bracket (10).

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