Rectification treatment process of anhydride curing agent for PVC structural foam

Abstract

The invention provides a rectification treatment process of an anhydride curing agent for PVC structural foam, and relates to the technical field of rectification processing, the rectification treatment process comprises a rectification tower and a feeding pipe, the feeding pipe is arranged on the side wall of the rectification tower, an equipartition structure is fixedly installed at the upper end of the feeding pipe, the equipartition structure comprises an annular block, and an annular inner groove is formed in the inner side of the annular block; a plurality of rotary columns are rotatably mounted in the annular inner groove, a first gear is fixedly mounted on the circumferential surface of each rotary column, an arc-shaped plate is fixedly mounted on the circumferential surface of each first gear, and a special-shaped triangular block is fixedly mounted on the side wall of each arc-shaped plate. The uniform distribution structure is integrally integrated on the annular block and is integrally formed, so that the uniform distribution structure can be additionally arranged or modified on an existing rectifying tower, the modification cost is reduced, meanwhile, the effects of multi-head conveying, uniform mixing, blockage prevention and the like are achieved, and the rectifying treatment effect and quality of the anhydride curing agent can be effectively improved when the uniform distribution structure is used.

Description

Technical Field

[0001] The invention belongs to the technical field of distillation processing, and more specifically, particularly relates to a distillation treatment process of an acid anhydride curing agent for PVC structural foam. Background Art

[0002] PVC (polyvinyl chloride) structural foam is a foam material with a closed-cell or open-cell structure. Anhydride curing agent is a chemical substance that can react chemically with certain active groups in PVC structural foam to solidify the foam material. Distillation is a method of separating components in a mixture by utilizing the different boiling points. In chemical production, distillation is a very important separation technology. The purpose of the distillation treatment of anhydride curing agent is to vaporize the mixture by heating, and then separate the anhydride curing agent from other impurities through repeated vaporization-condensation processes in the distillation tower, thereby improving the purity of the anhydride curing agent.

[0003] 1. During the production of the existing anhydride curing agent, it is usually necessary to transport the mixture of the anhydride curing agent and impurities to the feed port of the distillation tower. During the transportation process, the existing device usually transports the materials together through the feed pipeline, which cannot achieve uniform transportation of the materials and easily leads to insufficient subsequent mixing rate;

[0004] 2. During the production of the existing anhydride curing agent, it is usually necessary to transport the mixture of the anhydride curing agent and impurities to the feed port of the distillation tower. Since part of the transported material is solid, it is easy to get blocked during the transportation process, which leads to the problem that the proportion of materials is different from the actual process requirements and the processing quality is insufficient;

[0005] 3. During the production of the existing anhydride curing agent, it is usually necessary to transport the mixture of the anhydride curing agent and impurities to the feed port of the distillation tower. However, the existing feeding equipment often only has the function of conveying materials and cannot achieve the effect of pre-mixing, which leads to the problem of insufficient efficiency in subsequent processing. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a distillation treatment process of an acid anhydride curing agent for PVC structural foam to solve the above problems.

[0007] A distillation treatment process of an anhydride curing agent for PVC structural foam, comprising a distillation tower and a feed pipe, wherein the feed pipe is arranged on the side wall of the distillation tower:

[0008] An equalizing structure is fixedly installed on the upper end of the feed pipe;

[0009] The equal-dividing structure comprises an annular block, an annular inner groove is provided on the inner side of the annular block, a plurality of rotating cylinders are rotatably installed inside the annular inner groove, a first gear is fixedly installed on the circumferential surface of each rotating cylinder, an arc plate is fixedly installed on the circumferential surface of each first gear, a special-shaped triangular block is fixedly installed on the side wall of each arc plate, a plurality of sliding grooves are provided through the inner wall of the annular inner groove, an arc slide bar is fixedly installed between each of the arc plates and the special-shaped triangular block, each of the arc slide bar is located inside the slide groove, and each of the arc slide bar is slidably installed with the slide groove, a plurality of storage grooves are provided on the inner wall of the annular inner groove, a limit switch is fixedly installed inside each of the storage grooves, a collision block is fixedly installed at the lower end of each of the arc slide bars, a magnetic switch is fixedly installed at the end of the side wall of each of the special-shaped triangular blocks, an inner ring gear is rotatably installed inside the annular inner groove, a servo motor is embedded and symmetrically fixedly installed inside the annular inner groove, and a second gear is fixedly installed on the output shafts of the two servo motors.

[0010] Preferably, a plurality of through grooves are formed through the inner wall of the annular inner groove, each of the first gears is located below the slide groove, each of the arc-shaped plates and the special-shaped triangular block is parallel to the through groove, each of the arc-shaped plates and the special-shaped triangular block is slidably mounted with the through groove, and the two second gears are located on the inner side of the inner ring gear.

[0011] Preferably, the two second gears are meshed with the inner ring gear, each slide groove is located below the through groove, each slide groove is connected to the through groove, each storage groove is located below the slide groove, each impact block is matched with the limit switch, each limit switch is located above the first gear, the probe of each limit switch is spring-pressed, and the first discharge pipe is fixedly installed at the lower end of each special-shaped triangular block.

[0012] Preferably, each of the first discharge pipes is located on the outside of the magnetic switch, the inner ring gear is located on the outside of the rotating column, the inner ring gear is meshingly installed with the first gear, and a double-walled telescopic bellows is fixedly installed on the upper end of each of the first discharge pipes, and each of the double-walled telescopic bellows is located in a "J" shape.

[0013] Preferably, a conveying pipe is fixedly installed on the upper end of each double-walled telescopic bellows, a sealing shell is fixedly installed on the upper end of the annular block, each conveying pipe is partially exposed outside the sealing shell, a circular plate is fixedly installed inside the sealing shell, each circular plate has a plurality of circular grooves penetrated therein, the diameter of each circular groove is larger than the diameter of the double-walled telescopic bellows, each double-walled telescopic bellows is located on the inner side of the circular groove, a scrambler is provided on the inner side of the feed pipe, and the scrambler is located below the first discharge pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In the present invention, by turning on the servo motor, its output shaft will drive the second gear to rotate and mesh with the inner ring gear. At the same time, the rotation of the inner ring gear will mesh with the first gear, so that the first gear generates a radial force to drive the rotating column to rotate. At this time, the rotation of the rotating column will drive the arc plate and the special-shaped triangular block connected to the rotating column to rotate around the center of the rotating column, thereby making each arc plate and special-shaped triangular block connected to the rotating column unfold outward together, so that the first discharge pipe can be unfolded inside the annular block to put materials into different areas. At the same time, the materials are scattered by the scatterer, so that the materials can be evenly dispersed and transported. This evenly dispersed transportation can effectively improve the rate of subsequent processing;

[0016] In the present invention, by setting the slide groove, when the arc plate and the special-shaped triangular block rotate around the rotating column, the arc plate and the special-shaped triangular block can drive the arc-shaped slide bar to slide inside the slide groove, thereby avoiding the problem that the first discharge pipe connected to the special-shaped triangular block far from one side of the rotating column is far from the center of gravity and causes excessive vibration during transportation, thereby affecting the uniform and dispersed delivery, thereby improving stability;

[0017] In the present invention, by setting a limit switch, an impact block and a magnetic switch, as the arc-shaped slide bar moves, the impact block on the arc-shaped slide bar will impact the probe of the limit switch, so that the probe of the limit switch sends a control signal to the servo motor, and then controls the servo motor to change the direction, so that the arc-shaped plate and the special-shaped triangular block are closed inward again with the rotating column as the center of the circle. At the same time, when the magnetic switches on each special-shaped triangular block are too close, the magnetic switches on each special-shaped triangular block send a signal to the servo motor, so that the servo motor changes the direction again, so that the servo motor can always indirectly drive the arc-shaped plate and the special-shaped triangular block to reciprocate and close and expand, and then drive the first discharge pipe on the special-shaped triangular block to reciprocate and uniformly deliver the material into the distillation tower, thereby further improving the delivery effect;

[0018] In the present invention, by optimizing the layout and setting of the evenly divided structure, the evenly divided structure is integrated as a whole on the annular block, and the overall structure is an integrated structure, which is conducive to installation or modification on the existing distillation tower, reducing the modification cost, and at the same time, it has the effects of multi-head transportation, uniform mixing and anti-blocking, and can effectively improve the distillation treatment effect and quality of the anhydride curing agent.

[0019] In the present invention, since the processing of the acid anhydride curing agent requires that the materials have different properties according to the requirements, and because the double-walled telescopic bellows is in the shape of a "J", when powdered or solid materials pass through, certain blockage problems are prone to occur. By setting an equal distribution structure, when the staff turns on the servo motor to indirectly drive the arc plate and the special-shaped triangular block to reciprocate and close and unfold, the double-walled telescopic bellows can be pulled to perform adaptive stretching and resetting, and then the double-walled telescopic bellows can be made to vibrate, which can avoid blockage of the double-walled telescopic bellows and avoid the problem of insufficient processing quality caused by the material feeding metering not meeting the process requirement metering during subsequent processing;

[0020] In the present invention, since the movement of the arc plate and the special-shaped triangular block will cause the first discharge pipe to move, a double-walled telescopic bellows is provided to indirectly connect the first discharge pipe and the conveying pipe, which can adapt to the movement characteristics of the equal distribution structure when reciprocating to release materials. At the same time, by providing a circular plate and arranging the double-walled telescopic bellows inside the circular groove, the stability of the double-walled telescopic bellows during stretching and movement can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the three-dimensional connection explosion structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the feed pipe connection explosion structure of the present invention;

[0024] Figure 4 is a cross-sectional view of the sealing housing of the present invention;

[0025] Figure 5 It is a schematic diagram of the sealed shell connection explosion structure of the present invention;

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the annular block of the present invention;

[0027] Figure 7 is a cross-sectional view of the through groove of the present invention;

[0028] Figure 8 It is a schematic diagram of the annular block connection explosion structure of the present invention;

[0029] Fig. 9 It is a schematic diagram of the arc-shaped plate connection explosion structure of the present invention;

[0030] Fig.10 It is a schematic diagram of the explosion structure of the inner ring gear connection of the present invention;

[0031] Fig.11 The present invention Fig.10 A magnified view of the structure at A;

[0032] Fig.12 It is a schematic diagram of the three-dimensional structure of the arc-shaped slide bar of the present invention;

[0033] Fig.13 The present invention Fig.12 Enlarged view of the structure at point B in the figure.

[0034] In the figure, the correspondence between the component names and the figure numbers is: 11, distillation tower; 12, feed pipe; 13, annular block; 14, annular inner groove; 15, through groove; 16, rotating column; 17, first gear; 18, arc plate; 19, special-shaped triangular block; 21, slide groove; 22, arc slide bar; 23, storage groove; 24, limit switch; 25, impact block; 26, magnetic switch; 27, first discharge pipe; 28, inner ring gear; 29, servo motor; 31, second gear; 32, double-walled telescopic bellows; 33, conveying pipe; 34, sealing shell; 35, round plate; 36, round groove; 37, scatterer. DETAILED DESCRIPTION

[0035] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0036] See also Figure 1 - Fig.13 The present invention provides a distillation treatment process of an anhydride curing agent for PVC structural foam, comprising a distillation tower 11 and a feed pipe 12, wherein the feed pipe 12 is arranged on the side wall of the distillation tower 11:

[0037] An equal distribution structure is fixedly installed on the upper end of the feed pipe 12;

[0038] The equal distribution structure includes an annular block 13, an annular inner groove 14 is provided inside the annular inner groove 14, a plurality of rotating columns 16 are rotatably installed inside, a first gear 17 is fixedly installed on the circumferential surface of each rotating column 16, an arc plate 18 is fixedly installed on the circumferential surface of each first gear 17, a special-shaped triangular block 19 is fixedly installed on the side wall of each arc plate 18, a plurality of slide grooves 21 are provided through the inner wall of the annular inner groove 14, an arc slide bar 22 is fixedly installed between each arc plate 18 and the special-shaped triangular block 19, and each arc slide bar 22 is fixedly installed between each arc plate 18 and the special-shaped triangular block 19. 2 are all located inside the slide groove 21, and each arc-shaped slide bar 22 is slidably installed with the slide groove 21. By setting the slide groove 21, when the arc-shaped plate 18 and the special-shaped triangular block 19 rotate around the rotating column 16, the arc-shaped plate 18 and the special-shaped triangular block 19 can drive the arc-shaped slide bar 22 to slide inside the slide groove 21, thereby avoiding the problem that the first discharge pipe 27 connected to the special-shaped triangular block 19 far from the rotating column 16 is far from the center of gravity during transportation, which causes excessive vibration and affects the uniform and dispersed delivery, thereby improving stability.

[0039] A plurality of storage grooves 23 are provided on the inner wall of the annular inner groove 14, and a limit switch 24 is fixedly installed inside each storage groove 23, and a collision block 25 is fixedly installed at the lower end of each arc-shaped slide bar 22, and a magnetic switch 26 is fixedly installed at the end of the side wall of each special-shaped triangular block 19. An inner ring gear 28 is rotatably installed inside the annular inner groove 14, and a servo motor 29 is embedded and symmetrically fixed inside the annular inner groove 14, and a second gear 31 is fixedly installed on the output shaft of the two servo motors 29. By optimizing the layout and setting of the equal-division structure, the equal-division structure is integrated as a whole on the annular block 13, and the whole is an integrated structure, which is conducive to installation or modification on the existing distillation tower 11, reducing the modification cost, and at the same time, it has the effects of multi-head conveying, uniform mixing and anti-blocking, and can effectively improve the distillation treatment effect and quality of the acid anhydride curing agent. , and by turning on the servo motor 29, its output shaft will drive the second gear 31 to rotate and mesh with the inner ring gear 28. At the same time, the rotation of the inner ring gear 28 will mesh with the first gear 17, so that the first gear 17 generates a radial force to drive the rotating column 16 to rotate. At this time, the rotation of the rotating column 16 will drive the arc plate 18 and the special-shaped triangular block 19 connected to the rotating column 16 to rotate around the center of the circle of the rotating column 16, so that each arc plate 18 and the special-shaped triangular block 19 connected to the rotating column 16 are expanded outward together, so that the first discharge pipe 27 can be expanded inside the annular block 13 to release the acid anhydride curing agent material to different areas. At the same time, the acid anhydride curing agent material is dispersed by the disperser 37, so that the acid anhydride curing agent material can be evenly dispersed and transported. This uniform dispersion and transportation can effectively improve the rate of subsequent processing.

[0040] A plurality of through grooves 15 are formed through the inner wall of the annular inner groove 14, each first gear 17 is located below the slide groove 21, each arc plate 18 and the special-shaped triangular block 19 are parallel to the through groove 15, each arc plate 18 and the special-shaped triangular block 19 are slidably installed with the through groove 15, two second gears 31 are located on the inner side of the inner ring gear 28, and the two second gears 31 are meshed with the inner ring gear 28, each slide groove 21 is located below the through groove 15, each slide groove 21 is evenly connected to the through groove 15, each storage groove 23 is located below the slide groove 21, each impact block 25 is adapted to the limit switch 24, each limit switch 24 is located above the first gear 17, and the probe of each limit switch 24 is a spring-pressed type, and a first discharge pipe 27 is fixedly installed at the lower end of each special-shaped triangular block 19, and each first discharge pipe 27 is located on the outside of the magnetic switch 26, and the inner ring gear 28 is located on the outside of the rotating column 16, and the inner ring gear 28 is connected to the first gear 1 7 meshing installation, by setting the limit switch 24, the impact block 25 and the magnetic switch 26, as the arc-shaped slide bar 22 moves, the impact block 25 on the arc-shaped slide bar 22 will hit the probe of the limit switch 24, so that the probe of the limit switch 24 sends a control signal to the servo motor 29, and then controls the servo motor 29 to change the direction, so that the arc-shaped plate 18 and the special-shaped triangular block 19 are closed inward again with the rotating column 16 as the center of the circle. At the same time, when the magnetic switches 26 on each special-shaped triangular block 19 are too close, the magnetic switches 26 on each special-shaped triangular block 19 all send signals to the servo motor 29, so that the servo motor 29 changes the direction again, so that the servo motor 29 can always indirectly drive the arc-shaped plate 18 and the special-shaped triangular block 19 to reciprocate and close and expand, and then drive the first discharge pipe 27 on the special-shaped triangular block 19 to reciprocate. The acid anhydride curing agent material is evenly delivered to the distillation tower 11, and the delivery effect is further improved.

[0041] A double-walled telescopic bellows 32 is fixedly installed on the upper end of each first discharge pipe 27, and each double-walled telescopic bellows 32 is located in a "several" shape. A conveying pipe 33 is fixedly installed on the upper end of each double-walled telescopic bellows 32, and a sealing shell 34 is fixedly installed on the upper end of the annular block 13. Each conveying pipe 33 is partially exposed outside the sealing shell 34, and a circular plate 35 is fixedly installed inside the sealing shell 34. A plurality of circular grooves 36 are opened through the inside of each circular plate 35, and the diameter of each circular groove 36 is larger than the diameter of the double-walled telescopic bellows 32. Each double-walled telescopic bellows 32 is located Inside the circular groove 36, a scrambler 37 is provided on the inside of the feed pipe 12. The scrambler 37 is located below the first discharge pipe 27. The movement of the arc plate 18 and the special-shaped triangular block 19 will cause the first discharge pipe 27 to move. By setting a double-walled telescopic bellows 32 to indirectly connect with the first discharge pipe 27 and the conveying pipe 33, it can adapt to the characteristics of the reciprocating movement of the evenly distributed structure when the anhydride curing agent material is released. At the same time, by setting a circular plate 35 and setting the double-walled telescopic bellows 32 inside the circular groove 36, the stability of the double-walled telescopic bellows 32 during stretching and movement can be further improved.

[0042] The limit switch 24 is an electrical switch device used to control the range of mechanical movement. It is mainly used to detect whether an object has reached a specific position. The magnetic switch 26 is a switch that uses a magnetic field signal to control the on and off of a circuit. It mainly works by detecting the presence or absence of a magnetic field or changes in the intensity of the magnetic field. Usually, another pair of magnetic switches 26 are used in conjunction.

[0043] Working principle:

[0044] The first step is that when using, the staff first docks and installs the pipeline of the material conveying unit (the material conveying unit is a prior art, mainly composed of a pressure pump and a pipeline) with each conveying pipeline 33. When it is necessary to inject the acid anhydride curing agent material into the distillation tower 11, the material conveying unit is turned on, and the acid anhydride curing agent material is conveyed to the inside of the conveying pipeline 33. At the same time, the servo motor 29 is turned on (the servo motor 29, the limit switch 24, and the magnetic switch 26 are all controlled by an external PLC controller), and its output shaft rotates, driving the servo motor 29 to rotate. The second gear 31 is driven to rotate and mesh with the inner ring gear 28, so that the inner ring gear 28 rotates in the inner ring groove 14. When the inner ring gear 28 rotates, it meshes with the first gear 17, so that the first gear 17 generates a radial force to drive the rotating column 16 to rotate. The rotation of the rotating column 16 drives the arc plate 18 and the special-shaped triangular block 19 to rotate around the center of the rotating column 16. Each arc plate 18 and the special-shaped triangular block 19 connected to the rotating column 16 are expanded outward, and the arc plate 18 and the special-shaped triangular block 19 drive the arc slide 22 to slide in the slide groove 21;

[0045] In the second step, as the arc-shaped slide bar 22 moves, the impact block 25 on the arc-shaped slide bar 22 will hit the probe of the limit switch 24, so that the probe of the limit switch 24 sends a control signal to the servo motor 29, and then controls the servo motor 29 to change the direction, so that the inner ring gear 28 can be controlled to mesh with the first gear 17 with different rotations, so that the arc-shaped plate 18 and the special-shaped triangular block 19 are closed inward again with the rotating column 16 as the center of the circle. At the same time, when the magnetic switches 26 on each special-shaped triangular block 19 are too close, the magnetic switches 26 on each special-shaped triangular block 19 all send signals to the servo motor 29, so that the servo motor 29 changes the direction again, so that the servo motor 29 can always indirectly drive the arc-shaped plate 18 and the special-shaped triangular block 19 to reciprocate and close and expand, and then drive the first discharge pipe 27 on the special-shaped triangular block 19 to evenly release the acid anhydride curing agent material;

[0046] In the third step, when the first discharge pipe 27 moves, since the position of the first discharge pipe 27 changes, the first discharge pipe 27 will generate radial force to drive the double-walled telescopic bellows 32 to move to a certain extent, so that the double-walled telescopic bellows 32 slides to a certain extent inside the circular groove 36 on the circular plate 35. At the same time, due to the characteristics of the double-walled telescopic bellows 32 itself, when the first discharge pipe 27 is closed and unfolded due to the effect of the special-shaped triangular block 19, the double-walled telescopic bellows 32 will be stretched and reset adaptively;

[0047] In the fourth step, when the material falls through the first discharge pipe 27, the material will enter the feed pipe 12 at this time, so that the anhydride curing agent materials falling from the multiple first discharge pipes 27 can be dispersed by the disperser 37 (the disperser 37 is mainly composed of a rotating main shaft, a motor, and a bracket), and then evenly enter the distillation tower 11 through the feed pipe 12.

[0048] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A distillation treatment process of an anhydride curing agent for PVC structural foam, comprising a distillation tower (11) and a feed pipe (12), wherein the feed pipe (12) is arranged on the side wall of the distillation tower (11), characterized in that: An equalizing structure is fixedly installed on the upper end of the feed pipe (12); The equal distribution structure comprises an annular block (13), an annular inner groove (14) is provided on the inner side of the annular inner groove (14), a plurality of rotating columns (16) are rotatably installed inside the annular inner groove (14), a first gear (17) is fixedly installed on the circumferential surface of each rotating column (16), an arc plate (18) is fixedly installed on the circumferential surface of each first gear (17), a special-shaped triangular block (19) is fixedly installed on the side wall of each arc plate (18), a plurality of sliding grooves (21) are provided through the inner wall of the annular inner groove (14), an arc-shaped slide bar (22) is fixedly installed between each arc plate (18) and the special-shaped triangular block (19), and each arc-shaped slide bar (22) is located in the slide groove. (21), each of the arc-shaped slide bars (22) is slidably mounted with the slide groove (21), the inner wall of the annular inner groove (14) is provided with a plurality of storage grooves (23), a limit switch (24) is fixedly mounted inside each of the storage grooves (23), a collision block (25) is fixedly mounted at the lower end of each of the arc-shaped slide bars (22), a magnetic switch (26) is fixedly mounted at the end of the side wall of each of the special-shaped triangular blocks (19), an inner ring gear (28) is rotatably mounted inside the annular inner groove (14), a servo motor (29) is embedded and symmetrically fixedly mounted inside the annular inner groove (14), and a second gear (31) is fixedly mounted on the output shafts of the two servo motors (29).

2. The distillation treatment process of an anhydride curing agent for PVC structural foam according to claim 1, characterized in that: A plurality of through grooves (15) are formed through the inner wall of the annular inner groove (14); each of the first gears (17) is located below the slide groove (21); each of the arc-shaped plates (18) and the special-shaped triangular blocks (19) is parallel to the through groove (15); each of the arc-shaped plates (18) and the special-shaped triangular blocks (19) is slidably mounted on the through groove (15); and the two second gears (31) are located on the inner side of the inner ring gear (28).

3. A distillation treatment process of an anhydride curing agent for PVC structural foam as claimed in claim 2, characterized in that: The two second gears (31) are both meshed and installed with the inner ring gear (28), each of the slide grooves (21) is located below the through groove (15), and each of the slide grooves (21) is evenly connected to the through groove (15).

4. A distillation treatment process of an anhydride curing agent for PVC structural foam as claimed in claim 3, characterized in that: Each of the storage slots (23) is located below the slide slot (21), each of the impact blocks (25) is matched with a limit switch (24), and each of the limit switches (24) is located above the first gear (17).

5. A distillation treatment process of an anhydride curing agent for PVC structural foam as claimed in claim 4, characterized in that: The probe of each limit switch (24) is of spring-pressed type, and a first discharge pipe (27) is fixedly mounted on the lower end of each special-shaped triangular block (19).

6. A distillation treatment process of an anhydride curing agent for PVC structural foam as claimed in claim 5, characterized in that: Each of the first discharge pipes (27) is located outside the magnetic switch (26), the inner ring gear (28) is located outside the rotating column (16), and the inner ring gear (28) is meshed and installed with the first gear (17).

7. A distillation treatment process of an anhydride curing agent for PVC structural foam as claimed in claim 6, characterized in that: A double-walled telescopic corrugated pipe (32) is fixedly mounted on the upper end of each first discharge pipe (27), and each of the double-walled telescopic corrugated pipes (32) is located in a "J" shape.

8. A distillation treatment process of an anhydride curing agent for PVC structural foam as claimed in claim 7, characterized in that: A conveying pipe (33) is fixedly mounted on the upper end of each double-wall telescopic bellows (32), a sealing shell (34) is fixedly mounted on the upper end of the annular block (13), and each conveying pipe (33) is partially exposed outside the sealing shell (34).

9. A distillation treatment process of an anhydride curing agent for PVC structural foam as claimed in claim 8, characterized in that: A circular plate (35) is fixedly installed inside the sealing shell (34), and a plurality of circular grooves (36) are penetrated through the interior of each circular plate (35), and the diameter of each circular groove (36) is larger than the diameter of the double-wall telescopic bellows (32).

10. A distillation treatment process of an anhydride curing agent for PVC structural foam as claimed in claim 9, characterized in that: Each of the double-walled telescopic bellows (32) is located inside the circular groove (36), and a scatterer (37) is provided inside the feed pipe (12), and the scatterer (37) is located below the first discharge pipe (27).

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