Preparation device and preparation method of acetyl tri-n-butyl citrate

Abstract

The acetyl tri-n-butyl citrate preparation device comprises an outer barrel, a supporting frame is arranged at the top of the outer barrel, a motor is arranged at the bottom of the supporting frame, a grinding mechanism is in transmission connection with the bottom of the motor, a transmission shaft of the motor is a rectangular telescopic rod, and vertical movement of the grinding mechanism is not affected; a discharging hopper is fixedly arranged on one side of the grinding mechanism and arranged in a crack between the grinding mechanism and the outer barrel, feeding and discharging are conducted through a spiral flat plate in the grinding process, feeding and discharging can be conducted regularly in the period, automatic screening and substandard material backfilling can be conducted, and the grinding efficiency is improved. And the purposes of automation and timed operation are achieved regardless of grinding, feeding, returning or tiling of materials through a spiral flat plate.

Description

Technical Field

[0001] The invention belongs to the technical field, and particularly relates to a preparation device and a preparation method of acetyl citrate tri-n-butyl ester. Background Art

[0002] Acetyl tri-n-butyl citrate is a colorless, odorless, oily liquid that is insoluble in water but soluble in most organic solvents. It can be used as a non-toxic plasticizer for packaging materials such as dairy products, beverages, and foods. In the prior art, acetyl tri-n-butyl citrate is mostly processed by mixing a variety of materials, and its production process may include a crushing process and a mixing process. The crushing process can grind and crush the solid materials in the raw materials, and then mix them after crushing to improve the preparation efficiency. For example, some preparation processes require that the citric acid and n-butanol used as raw materials undergo an esterification reaction under the action of a catalyst, and acetyl tri-n-butyl citrate is obtained by dealcoholization. In the preparation process, the crushing process is used to grind and grind the citric acid, which can greatly improve the preparation efficiency; However, most of the current grinding equipment can only perform single-item grinding work. If you want to know whether the ground materials are all up to standard, they have to be screened. The screened materials need to be re-ground by the staff. This work efficiency is low. If they are not screened, the effect of the esterification reaction will be affected. There is no structure that can screen during the grinding process and automatically return the materials for grinding if they do not meet the standards. Summary of the invention

[0003] The object of the present invention is to provide a preparation device and a preparation method of acetyl citrate tri-n-butyl ester to solve the above-mentioned problems.

[0004] To achieve the above object, the present invention provides the following technical solution: a preparation device of tri-n-butyl acetyl citrate, comprising an outer barrel, a support frame is arranged on the top of the outer barrel, a motor is arranged at the bottom of the support frame, a grinding mechanism is connected to the bottom of the motor in a transmission manner, the transmission shaft of the motor is a rectangular telescopic rod, which does not affect the up and down movement of the grinding mechanism, a lower hopper is fixedly arranged on one side of the grinding mechanism, and the lower hopper is arranged in the gap between the grinding mechanism and the outer barrel; The grinding mechanism comprises an upper plate arranged at the bottom of the motor output shaft, a grinding assembly is arranged at the bottom of the upper plate, a plurality of elastic contraction assemblies are fixedly arranged on the outer edge of the grinding assembly and the upper plate, an electromagnet is fixedly inlaid at the bottom of the grinding assembly, a spring 2 is arranged in the hole inside the electromagnet and the spring 2 is fixedly connected to the grinding assembly, a matching plate is fixedly arranged at the bottom of the grinding assembly and a spiral plate is slidably arranged inside the matching plate, the spiral plate passes through the matching plate and is fixedly connected with a plurality of springs 2 and is fixed by the electromagnet, the output shaft at the bottom of the motor passes through the upper plate and the surface of the grinding assembly and the spiral plate in the state of being adsorbed by the electromagnet and the surface of the matching plate are all on the same plane and the output shaft of the motor is fixedly connected to the grinding assembly, a touch switch is elastically connected to the bottom of the grinding assembly and the touch switch is arranged on one side of the electromagnet; A lower grinding plate is provided at the bottom of the spiral plate, and a screening net whose inclination angle changes as the lower grinding plate moves up and down is connected to the outer edge of the lower grinding plate; A downward pressure rebound component is arranged between the lower grinding plate and the inner side of the outer barrel. When the lower grinding plate is pressed downward by the grinding component, the screening net changes its tilt angle following the downward pressure of the lower grinding plate, and after the grinding component rises, the downward pressure rebound component restores the position of the lower grinding plate, and the screening net also restores its tilt angle accordingly.

[0005] Preferably, a plurality of arc-shaped guide blocks are provided on the top of the grinding assembly and the bottom of the upper plate, and the arc-shaped guide blocks on the upper plate and the grinding assembly are staggered and arranged relative to each other, so that the grinding assembly drives the arc-shaped guide block on its top to rotate and is limited by the sliding of the arc-shaped guide block on the bottom of the upper plate to form an up and down movement.

[0006] Preferably, the elastic contraction component includes a lower connecting column and an upper connecting column which are fixedly connected to the upper plate and the grinding component, the bottom of the upper connecting column is inserted into the lower connecting column and a spring three is fixedly connected to the inner wall of the lower connecting column, an electromagnet two is sleeved on the outer edge of the bottom of the upper connecting column and the electromagnet two is energized to adsorb the lower connecting column so that the upper connecting column compresses the spring three to the innermost end.

[0007] Preferably, the downward pressure rebound assembly includes a plurality of holes opened at the top end of the lower grinding plate and a plurality of springs are fixedly connected in the holes, and the bottoms of the plurality of springs are fixedly connected to the boss at the top end of the outer barrel so that the lower grinding plate is supported by the boss inside the outer barrel after being pressed down to the maximum size.

[0008] Preferably, the top of the lower grinding plate has the same diameter as the matching plate, and a collecting plate is sleeved on the outer side of the bottom of the lower grinding plate. The collecting plate is inclined, and the collecting plate receives the material screened by the screening net.

[0009] Preferably, the top of the upper plate is connected to the support frame via an electric push rod or an electric cylinder to push the grinding mechanism downward as a whole.

[0010] Preferably, the bottom of the lower hopper extends to the top of the screening net for loading materials, a discharge pipe is provided on one side of the outer barrel and one end of the discharge pipe extends to the lowest point of the inclination of the collecting plate for discharging materials.

[0011] Preferably, the screening net is detachably connected to the lower grinding plate and the inner wall of the outer barrel for replacing blanks of various specifications.

[0012] A method for using a device for preparing tri-n-butyl acetyl citrate, the specific steps are as follows: Step 1: Material discharge; the staff can directly discharge the material to the top of the screening net through the discharge hopper, and then start the electric push rod set between the grinding mechanism and the support frame and cut off the power of the electromagnet, so that the spiral plate is pushed outward for a distance by the thrust of the second spring. When the spiral plate moves below the horizontal plane of the matching plate and contacts the surface of the lower grinding plate, it presses the electric push rod, and then starts the motor to drive the grinding assembly, the matching plate and the spiral plate to rotate as a whole. The material placed on the surface of the screening net is continuously rotated and driven to the surface of the lower grinding plate by the counterclockwise rotation of the extended spiral plate; Step 2: Grinding; when most of the materials are evenly placed on the surface of the lower grinding plate by the rotation of the spiral plate, continue to start the electric push rod to press the grinding assembly and the spiral plate. At this time, the elastic force of the second spring is greater than the elastic force of the first spring, so that the spiral plate pushes the lower grinding plate to compress the spring and move down. The residual materials on the screening net, which are initially tilted upward, slide onto the lower grinding plate because the screening net changes its angle as the lower grinding plate moves downward. When the lower grinding plate moves to the bottom and contacts the boss in the outer barrel, the pressure measures compress the spiral plate against the second spring and moves toward the inside of the matching plate until it touches the touch switch, and a signal is sent to start the electromagnet to absorb the spiral plate and retract it. At this time, the motor is started to drive the grinding assembly to rotate to realize the splicing of the matching plate and the spiral plate for plane grinding; Step 3: Discharging; During the grinding process, the upper plate does not rotate and the grinding assembly rotates, and the electromagnet 2 is powered off at this time. The rear grinding assembly is connected to the upper plate through the elastic force of the spring 3, so that the grinding assembly drives the plane formed by the matching plate and the spiral plate to move up and down during the mutual extrusion of the upper and lower arc-shaped guide blocks to achieve continuous grinding; Step 4: Return the material; during the feeding period, turn off the above-mentioned rotating grinding, then start the electric push rod to move the grinding assembly upward, the lower grinding plate moves upward under the elastic force until it drives the screening net to move upward and change the inclination angle, then flip the motor and cut off the power to the electromagnet to extend the spiral plate, the forward rotation of the spiral plate moves the material inward, and the reverse rotation sweeps outward until it is swept onto the screening net for screening, the material that meets the screening standards falls onto the collecting plate and is then discharged, and the material that does not meet the standards will continue to slide to the upper surface of the lower grinding plate for grinding when the screening net moves downward and changes its angle with the lower grinding plate during the next grinding.

[0013] The technical effects and advantages of the present invention are as follows: the material placed on the surface of the screening net is continuously rotated and driven to the surface of the lower grinding plate by the counterclockwise rotation of the extended spiral plate. When most of the material is evenly placed on the surface of the lower grinding plate by the rotation of the spiral plate, the electric push rod is continued to be started to press the grinding assembly and the spiral plate. At this time, the elastic force of the second spring is greater than the elastic force of the first spring, so that the spiral plate pushes the lower grinding plate to compress the spring and move. The residual material on the screening net, which is initially tilted upward, slides onto the lower grinding plate because the screening net changes its angle as the lower grinding plate moves downward. After the lower grinding plate moves to the lowest end and contacts the boss in the outer barrel, the pressure measure compresses the spiral plate against the second spring and moves toward the inside of the matching plate until it touches the touch switch, and a signal is sent to start the electromagnet to adsorb the spiral plate and retract it. At this time, the motor is started to drive the grinding assembly to rotate to realize the plane grinding after the matching plate and the spiral plate are spliced, and the start After the electric push rod moves the grinding assembly upward, the lower grinding plate moves upward under the elastic force until it drives the screening net to move upward and change the inclination angle, then the motor is flipped and the electromagnet is powered off to extend the spiral plate. The forward rotation of the spiral plate moves the material inward, and the reverse rotation sweeps outward until it is swept onto the screening net for screening. The qualified ones fall onto the collecting plate and are then discharged, and the unqualified ones continue to slide to the upper surface of the lower grinding plate for grinding when the screening net changes its angle as the lower grinding plate moves downward at the next grinding. The present invention can perform grinding accurately, and use the spiral plate for loading and unloading during the grinding process, and can load and unload materials regularly during the period, automatically screen and backfill materials that do not meet the standards, no matter it is grinding, loading, returning or using the spiral plate to spread the materials, the purpose of automatic and timed operation is achieved, which greatly reduces the participation of staff and does not allow the discharge of materials that do not meet the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 A bottom view of the internal structure of the present invention; Figure 4 It is an exploded view of the internal structure of the present invention; Figure 5 It is a schematic diagram of the installation structure of the matching plate and the spiral flat plate of the present invention; Figure 6 It is a schematic diagram of the interior of the elastic shrinkage component of the present invention.

[0015] In the figure: 1. outer barrel; 2. lower hopper; 3. support frame; 4. motor; 5. discharge pipe; 6. grinding mechanism; 601. elastic contraction component; 6011. lower connecting column; 6012. spring three; 6014. upper connecting column; 6015. electromagnet two; 602. upper plate; 603. grinding component; 604. lower grinding plate; 606. spring one; 607. arc guide block; 609. spiral plate; 610. matching plate; 611. touch switch; 612. electromagnet; 613. spring two; 7. collecting plate; 8. screening net. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The present invention provides Figure 1-Figure 6 A preparation device for tri-n-butyl acetyl citrate shown in the figure comprises an outer barrel 1, a support frame 3 is arranged on the top of the outer barrel 1, a motor 4 is arranged at the bottom of the support frame 3, a grinding mechanism 6 is connected to the bottom of the motor 4, the transmission shaft of the motor 4 is a rectangular telescopic rod, which does not affect the up and down movement of the grinding mechanism 6, a lower hopper 2 is fixedly arranged on one side of the grinding mechanism 6, and the lower hopper 2 is arranged in the gap between the grinding mechanism 6 and the outer barrel 1; The grinding mechanism 6 includes an upper plate 602 arranged at the bottom of the output shaft of the motor 4, a grinding assembly 603 is arranged at the bottom of the upper plate 602, a plurality of elastic contraction assemblies 601 are fixedly arranged on the outer edge of the grinding assembly 603 and the upper plate 602, an electromagnet 612 is fixedly inlaid at the bottom of the grinding assembly 603, a spring 613 is arranged in the hole inside the electromagnet 612 and the spring 613 is fixedly connected to the grinding assembly 603, a matching plate 610 is fixedly arranged at the bottom of the grinding assembly 603 and a screw is slidably arranged inside the matching plate 610 The spiral plate 609 penetrates the matching plate 610 and is fixedly connected with a plurality of springs 613 and is fixedly attached by the electromagnet 612. The output shaft at the bottom of the motor 4 penetrates the upper plate 602 and the grinding assembly 603. The surface of the spiral plate 609 in the state of being adsorbed by the electromagnet 612 and the surface of the matching plate 610 are all on the same plane. The output shaft of the motor 4 is fixedly connected with the grinding assembly 603. A touch switch 611 is elastically connected to the bottom of the grinding assembly 603 and the touch switch 611 is arranged on one side of the electromagnet 612. A lower grinding plate 604 is disposed at the bottom of the spiral flat plate 609, and a screening net 8 is connected to the outer edge of the lower grinding plate 604, which changes its inclination angle as the lower grinding plate 604 moves up and down; A downward pressure rebound component is arranged between the lower grinding plate 604 and the inner side of the outer barrel 1. When the lower grinding plate 604 is pressed downward by the grinding component 603, the screening net 8 changes its tilt angle following the downward pressure of the lower grinding plate 604, and after the grinding component 603 rises, the position of the lower grinding plate 604 is restored by the downward pressure rebound component, and the screening net 8 also restores its tilt angle accordingly.

[0018] Specifically, a plurality of arc-shaped guide blocks 607 are arranged at the top of the grinding component 603 and the bottom of the upper plate 602, and the arc-shaped guide blocks 607 on the upper plate 602 and the grinding component 603 are staggered and arranged relative to each other, so that the grinding component 603 drives the arc-shaped guide block 607 on its top to rotate and is limited by the sliding of the arc-shaped guide block 607 at the bottom of the upper plate 602 to form an up and down movement.

[0019] Specifically, the elastic contraction component 601 includes a lower connecting column 6011 and an upper connecting column 6014 which are fixedly connected to the upper plate 602 and the grinding component 603. The bottom of the upper connecting column 6014 is inserted into the lower connecting column 6011 and a spring three 6012 is fixedly connected to the inner wall of the lower connecting column 6011. An electromagnet two 6015 is sleeved on the outer edge of the bottom of the upper connecting column 6014 and the electromagnet two 6015 is energized to adsorb the lower connecting column 6011 so that the upper connecting column 6014 compresses the spring three 6012 to the innermost end.

[0020] Specifically, the downward pressure rebound component includes a plurality of holes opened at the top of the lower grinding plate 604 and a plurality of springs 606 are fixedly connected in the holes. The bottom of the plurality of springs 606 is fixedly connected to the boss at the top of the inner top of the outer barrel 1 so that the lower grinding plate 604 is supported by the boss inside the outer barrel 1 after being pressed down to the maximum size. The top of the lower grinding plate 604 has the same diameter as the matching plate 610. A collecting plate 7 is sleeved on the outer side of the bottom of the lower grinding plate 604. The collecting plate 7 is inclined and receives the material screened by the screening net 8.

[0021] Specifically, the top of the upper plate 602 is connected to the support frame 3 through an electric push rod or an electric cylinder, which pushes the grinding mechanism 6 to move downward as a whole. The bottom of the lower hopper 2 extends to the top of the screening net 8 for loading materials. A discharge pipe 5 is provided on one side of the outer barrel 1 and one end of the discharge pipe 5 extends to the lowest point of the inclination of the collecting plate 7 for discharging materials. The screening net 8 is detachably connected to the lower grinding plate 604 and the inner wall of the outer barrel 1 for replacing materials of various specifications.

[0022] Working principle: The staff can directly put the material onto the top of the screening net 8 through the lower hopper 2, and then start the electric push rod set between the grinding mechanism 6 and the support frame 3 and cut off the power of the electromagnet 612, so that the spiral plate 609 is pushed outward for a distance by the spring 2 613. When the spiral plate 609 moves below the horizontal plane of the matching plate 610 and contacts the surface of the lower grinding plate 604, it presses against the electric push rod, and then starts the motor 4 to drive the grinding assembly 603, the matching plate 610 and the spiral plate 609 to rotate as a whole. The extended spiral plate 609 rotates counterclockwise to continuously rotate the material put on the surface of the screening net 8 and drive it to the lower grinding plate 604. When most of the materials are evenly placed on the surface of the lower grinding plate 604 by the rotation of the spiral plate 609, the electric push rod is started to press the grinding assembly 603 and the spiral plate 609. At this time, the elastic force of the spring 2 613 is greater than the elastic force of the spring 1 606, so that the spiral plate 609 pushes the lower grinding plate 604 to compress the spring 1 606 to move downward. The residual materials on the screening net 8, which were initially tilted upward, slide onto the lower grinding plate 604 because the screening net 8 changes its angle as the lower grinding plate 604 moves downward. When the lower grinding plate 604 moves to the lowest end and contacts the boss in the outer barrel 1, the pressure measures compress the spiral plate 609 against the spring 2 613 to cooperate After the plate 610 moves inside until it touches the touch switch 611, a signal is sent to start the electromagnet 612 to absorb the spiral plate 609 and retract it. At this time, the motor 4 is started to drive the grinding assembly 603 to rotate to realize the plane grinding after the matching plate 610 and the spiral plate 609 are spliced. In the grinding process, the non-rotation of the upper plate 602 and the rotation of the grinding assembly 603 are used, and at this time, the electromagnet 2 6015 is powered off, and the rear grinding assembly 603 and the upper plate 602 are connected by the elastic force of the spring 3 6012, so that the grinding assembly 603 drives the plane formed by the matching plate 610 and the spiral plate 609 to move up and down during the mutual extrusion of the upper and lower arc-shaped guide blocks 607. The above-mentioned rotary grinding is realized continuously by movement. The above-mentioned rotary grinding is closed during the feeding period. Then, after the electric push rod is started to move the grinding assembly 603 upward, the lower grinding plate 604 is moved upward by the elastic force until the screening net 8 is driven to move upward and change the inclination angle. Then, the motor 4 is turned over and the electromagnet 612 is powered off to extend the spiral plate 609. The forward rotation of the spiral plate 609 is to move the material inward, and the reverse rotation is to sweep outward until it is swept onto the screening net 8 for screening. The materials that meet the screening standards fall onto the collecting plate 7 and are then discharged. The materials that do not meet the standards will continue to slide onto the upper surface of the lower grinding plate 604 for grinding when the screening net 8 moves downward and changes its angle with the lower grinding plate 604 during the next grinding. In summary, the present invention can perform precise grinding, and during the grinding process, the spiral plate 609 can be used for loading and unloading. During the process, the loading and unloading can be carried out at a regular time, and the materials that do not meet the standards can be automatically screened and backfilled. Whether it is grinding, loading, returning or using the spiral plate 609 to spread the materials, the purpose of automatic and timed operation is achieved, which greatly reduces the participation of staff and does not cause the discharge of materials that do not meet the standards.

[0023] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for preparing tri-n-butyl acetyl citrate, comprising an outer barrel (1), a support frame (3) being arranged on the top of the outer barrel (1), a motor (4) being arranged on the bottom of the support frame (3), a grinding mechanism (6) being connected to the bottom of the motor (4), and characterized in that: The transmission shaft of the motor (4) is a rectangular telescopic rod, which does not affect the up and down movement of the grinding mechanism (6); a lower hopper (2) is fixedly provided on one side of the grinding mechanism (6), and the lower hopper (2) is arranged in the gap between the grinding mechanism (6) and the outer barrel (1); The grinding mechanism (6) comprises an upper plate (602) arranged at the bottom of the output shaft of the motor (4); a grinding assembly (603) is arranged at the bottom of the upper plate (602); a plurality of elastic contraction assemblies (601) are fixedly arranged on the outer edges of the grinding assembly (603) and the upper plate (602); an electromagnet (612) is fixedly inlaid at the bottom of the grinding assembly (603); a second spring (613) is arranged in a hole inside the electromagnet (612) and the second spring (613) is fixedly connected to the grinding assembly (603); a matching plate (610) is fixedly arranged at the bottom of the grinding assembly (603) and a sliding arrangement is arranged inside the matching plate (610). A spiral plate (609) is provided, the spiral plate (609) passes through the matching plate (610) and is fixedly connected to a plurality of springs (613) and is fixedly attached by an electromagnet (612); the output shaft at the bottom of the motor (4) passes through the upper plate (602) and the grinding assembly (603) and the spiral plate (609), and the surface of the spiral plate (609) in a state of being attached by the electromagnet (612) and the surface of the matching plate (610) are all on the same plane; the output shaft of the motor (4) is fixedly connected to the grinding assembly (603); a touch switch (611) is elastically connected to the bottom of the grinding assembly (603), and the touch switch (611) is arranged on one side of the electromagnet (612); A lower grinding plate (604) is disposed at the bottom of the spiral flat plate (609), and a screening net (8) is connected to the outer edge of the lower grinding plate (604) and changes its inclination angle as the lower grinding plate (604) moves up and down; A downward pressure rebound component is provided between the lower grinding plate (604) and the inner side of the outer barrel (1); when the lower grinding plate (604) is pressed downward by the grinding component (603), the screening net (8) changes its tilt angle following the downward pressure of the lower grinding plate (604); and after the grinding component (603) rises, the downward pressure rebound component restores the position of the lower grinding plate (604), and the screening net (8) also restores its tilt angle accordingly.

2. A preparation device for tri-n-butyl acetyl citrate according to claim 1, characterized in that: A plurality of arc-shaped guide blocks (607) are arranged on the top of the grinding assembly (603) and the bottom of the upper plate (602), and the arc-shaped guide blocks (607) on the upper plate (602) and the grinding assembly (603) are staggered and arranged relative to each other, so that the grinding assembly (603) drives the arc-shaped guide block (607) on the top thereof to rotate and is limited by the sliding of the arc-shaped guide block (607) on the bottom of the upper plate (602) to form an up and down movement.

3. A preparation device for tri-n-butyl acetyl citrate according to claim 1, characterized in that: The elastic contraction component (601) comprises a lower connecting column (6011) and an upper connecting column (6014) which are fixedly connected to the upper plate (602) and the grinding component (603); the bottom of the upper connecting column (6014) is inserted into the interior of the lower connecting column (6011) and a spring three (6012) is fixedly connected to the inner wall of the lower connecting column (6011); an electromagnet two (6015) is sleeved on the outer edge of the bottom of the upper connecting column (6014), and the electromagnet two (6015) is energized to adsorb the lower connecting column (6011) so that the upper connecting column (6014) compresses the spring three (6012) to the innermost end.

4. A preparation device for tri-n-butyl acetyl citrate according to claim 1, characterized in that: The downward pressing rebound component comprises a plurality of holes opened at the top of the lower grinding plate (604) and a plurality of springs (606) fixedly connected in the holes, wherein the bottoms of the plurality of springs (606) are fixedly connected to the boss at the top of the inner side of the outer barrel (1) so that the lower grinding plate (604) is supported by the boss inside the outer barrel (1) after being pressed down to the maximum size.

5. A device for preparing tri-n-butyl acetyl citrate according to claim 4, characterized in that: The top of the lower grinding plate (604) has the same diameter as the matching plate (610), and a collecting plate (7) is sleeved on the outer side of the bottom of the lower grinding plate (604). The collecting plate (7) is arranged in an inclined manner, and the collecting plate (7) receives the material screened by the screening net (8).

6. A preparation device for tri-n-butyl acetyl citrate according to claim 1, characterized in that: The top of the upper plate (602) is connected to the support frame (3) via an electric push rod or an electric cylinder, which pushes the grinding mechanism (6) to move downward as a whole.

7. A preparation device for tri-n-butyl acetyl citrate according to claim 1, characterized in that: The bottom of the lower hopper (2) extends to the top of the screening net (8) for loading materials, and a discharge pipe (5) is provided on one side of the outer barrel (1), and one end of the discharge pipe (5) extends to the lowest inclined point of the collecting plate (7) for discharging materials.

8. The device for preparing tri-n-butyl acetyl citrate according to claim 1, characterized in that: The screening net (8) is detachably connected to the lower grinding plate (604) and the inner wall of the outer barrel (1) for replacing blanks of various specifications.

9. The method for using the device for preparing tri-n-butyl acetyl citrate according to any one of claims 1 to 8, characterized in that: The specific steps are as follows: Step 1: unloading; the staff can directly put the material onto the top of the screening net (8) through the unloading hopper (2), and then start the electric push rod arranged between the grinding mechanism (6) and the support frame (3) to cut off the power of the electromagnet (612), so that the spiral plate (609) is pushed outward by the thrust of the second spring (613). When the spiral plate (609) moves below the horizontal plane of the matching plate (610) and contacts the surface of the lower grinding plate (604), it presses against the electric push rod, and then starts the motor (4) to drive the grinding assembly (603), the matching plate (610) and the spiral plate (609) to rotate as a whole, and the material placed on the surface of the screening net (8) is continuously rotated and driven to the surface of the lower grinding plate (604) by the extended spiral plate (609) rotating counterclockwise; Step 2: Grinding; when most of the materials are evenly placed on the surface of the lower grinding plate (604) by the rotation of the spiral plate (609), the electric push rod is started to press the grinding assembly (603) and the spiral plate (609). At this time, the elastic force of the second spring (613) is greater than the elastic force of the first spring (606), so that the spiral plate (609) drives the lower grinding plate (604) to compress the first spring (606) and move downward. The residual materials on the screening net (8) that are initially tilted upward are changed due to the downward movement of the screening net (8) as the lower grinding plate (604) moves downward. The lower grinding plate (604) slides down to the lower grinding plate (604) at an angle. When the lower grinding plate (604) moves to the lowest end and contacts the boss in the outer barrel (1), the pressure means compresses the spiral plate (609) against the spring 2 (613) to move toward the inside of the matching plate (610) until it touches the touch switch (611). Then, a signal is sent to start the electromagnet (612) to absorb the spiral plate (609) and retract it. At this time, the motor (4) is started to drive the grinding assembly (603) to rotate to realize the plane grinding after the matching plate (610) and the spiral plate (609) are spliced. Step 3: discharging the material; during the grinding process, the non-rotation of the upper plate (602) and the rotation of the grinding assembly (603) are utilized, and at this time, after the electromagnet 2 (6015) is powered off, the grinding assembly (603) and the upper plate (602) are elastically connected through the spring 3 (6012), so that the grinding assembly (603) drives the plane formed by the matching plate (610) and the spiral plate (609) to move up and down during the mutual extrusion of the upper and lower arc-shaped guide blocks (607) to achieve continuous grinding; Step 4: Returning materials; during the feeding period, the above-mentioned rotary grinding is turned off, and then the electric push rod is started to move the grinding assembly (603) upward. The lower grinding plate (604) is moved upward by the elastic force until the screening net (8) is driven to move upward and change the inclination angle. Then the motor (4) is turned over and the electromagnet (612) is turned off to extend the spiral plate (609). The spiral plate (609) is used to move the material inward when it rotates forward, and to sweep outward when it rotates reversely until it is swept onto the screening net (8) for screening. The materials that meet the screening standards fall onto the collecting plate (7) and are then discharged. The materials that do not meet the standards continue to slide onto the upper surface of the lower grinding plate (604) for grinding when the screening net (8) moves downward and changes its angle as the lower grinding plate (604) moves downward.

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