An apparatus for preparing ultraviolet light absorbers

Abstract

This invention relates to an apparatus for preparing ultraviolet absorbers, comprising a housing, a support column fixedly mounted on the housing, a first cavity fixedly mounted on the housing, an electronic control board fixedly mounted on the first cavity, a drive mechanism fixedly mounted on the first cavity, a second cavity fixedly mounted on the housing, a crystallization mechanism fixedly mounted on the second cavity, and a condensation mechanism slidably mounted on the second cavity. This invention solves the problem of ultraviolet absorber crystals adhering to the scraper in existing crystallization equipment.

Description

Technical Field

[0001] This invention relates to the field of ultraviolet absorber production equipment technology, specifically to an ultraviolet absorber preparation apparatus. Background Technology

[0002] Ultraviolet (UV) absorbers are widely used light stabilizers that absorb the UV rays from sunlight and fluorescent light sources without changing themselves. The preparation of UV absorbers involves multiple steps, one of which is crystallization. The UV absorber solution is poured into a crystallization device for evaporation and crystallization. Existing crystallization equipment has a stirring shaft and a scraper, both driven separately. During stirring, the scraper is immersed in the UV absorber solution. This causes the UV absorber crystals to adhere to the scraper, but the scraper can only scrape the inner wall and bottom of the container. Consequently, the crystals adhering to the scraper cannot be scraped off, ultimately reducing the crystal yield. Furthermore, the crystals adhering to the scraper also reduce its working efficiency. Summary of the Invention

[0003] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0004] To address the technical problems mentioned in the background section, some embodiments of this application provide an ultraviolet absorber preparation apparatus, including a housing, a support column fixedly disposed on the housing, a first cavity fixedly disposed on the housing, an electronic control board fixedly disposed on the first cavity, a drive mechanism fixedly disposed on the first cavity, a second cavity fixedly disposed on the housing, a crystallization mechanism fixedly disposed on the second cavity, and a condensation mechanism slidably disposed on the second cavity; the crystallization mechanism includes a first chute fixedly disposed on the housing, a crystallization tank fixedly disposed on the second cavity, a first rotating shaft rotatably disposed on the crystallization tank and the first chute, a first support column symmetrically fixedly disposed on the first rotating shaft, a second support column symmetrically fixedly disposed on the first rotating shaft, a first scraper fixedly disposed on the first rotating shaft, a first stirring and scraping assembly fixedly disposed on the first and second support columns, a second stirring and scraping assembly fixedly disposed on the second support column and the scraper, a first limiting assembly fixedly disposed on the first and second stirring and scraping assemblies, and a heating plate fixedly disposed on the crystallization tank;

[0005] The first stirring and scraping assembly includes a second chute fixedly disposed on a first support column, a third chute fixedly disposed on the second support column, a first stirring shaft slidably disposed on the second chute and the third chute, a second scraper rotatably disposed on the first stirring shaft, and a second limiting assembly fixedly disposed on the second chute.

[0006] The second stirring and scraping assembly includes a fourth sliding groove fixedly mounted on the second support column, a fifth sliding groove fixedly mounted on the first scraper, a second stirring shaft slidably mounted on the fourth and fifth sliding grooves, a third scraper rotatably mounted on the second stirring shaft, and a third limiting assembly fixedly mounted on the fourth sliding groove.

[0007] Specifically, the first limiting component includes a protrusion fixedly disposed on the first stirring shaft, a first mounting hole symmetrically fixedly disposed on the protrusion, a first limiting head slidably disposed on the first mounting hole, a groove fixedly disposed on the second stirring shaft, a second mounting hole fixedly disposed on the second stirring shaft, a second limiting head slidably disposed on the second mounting hole, a first limiting hole fixedly disposed on the fourth sliding groove, and a second limiting hole fixedly disposed on the groove; the first limiting head and the first mounting hole are connected by a first spring; the second limiting head and the second mounting hole are connected by a second spring.

[0008] Specifically, the second limiting component includes a first top block slidably disposed on the first support column, a second top block slidably disposed on the first support column, a first pressing block slidably disposed on the second top block, a first transmission block symmetrically slidably disposed on the second top block, and a first clamping block symmetrically slidably disposed on the second top block; the first top block and the first support column are connected by a third spring; the second top block and the first support column are connected by a fourth spring; the first pressing block and the second top block are connected by a fifth spring; and the first clamping block and the second top block are connected by a sixth spring.

[0009] Specifically, the third limiting component includes a third top block slidably disposed on the second pillar, a fourth top block slidably disposed on the second pillar, a second pressing block slidably disposed on the fourth top block, a second transmission block symmetrically slidably disposed on the fourth top block, and a second clamping block symmetrically slidably disposed on the fourth top block; the third top block and the second pillar are connected by a seventh spring; the fourth top block and the second pillar are connected by an eighth spring; the second pressing block and the fourth top block are connected by a ninth spring; and the second clamping block and the fourth top block are connected by a tenth spring.

[0010] Specifically, the drive mechanism includes a motor fixedly mounted on the first cavity, a reduction gearbox fixedly mounted on the motor, a first gear fixedly mounted on the reduction gearbox, a second gear fixedly mounted on the first rotating shaft, a through groove fixedly mounted on the first rotating shaft, a sixth sliding groove fixedly mounted on the first rotating shaft, and an input pipe rotatably mounted on the sixth sliding groove and fixedly mounted on the housing.

[0011] Specifically, the condensation mechanism includes a seventh slide groove fixedly disposed on the housing, an eighth slide groove fixedly disposed on the housing, a condensation tank slidably disposed on the seventh slide groove and the eighth slide groove, a linkage assembly fixedly disposed on the condensation tank and the first rotating shaft, and a circulation assembly fixedly disposed on the housing.

[0012] Specifically, the linkage assembly includes a first connecting rod fixedly mounted on the condenser tank, a first collar fixedly mounted on the first connecting rod and slidably sleeved on the first rotating shaft, a second collar slidably sleeved on the first rotating shaft, a ninth sliding groove fixedly mounted on the first rotating shaft, a second connecting rod fixedly mounted on the second collar and slidably mounted on the ninth sliding groove, and a third connecting rod rotatably mounted on the second connecting rod and rotatably mounted at one end of the first stirring shaft; the condenser tank and the shell are connected by an eleventh spring.

[0013] Specifically, the circulation assembly includes a first flexible hose fixed to the housing and a water pump fixed to the first cavity; the water pump and the input pipe are connected through a second flexible hose.

[0014] The beneficial effects of this invention are:

[0015] (1) The first stirring and scraping component and the second stirring and scraping component play the role of stirring and accelerating crystallization during the evaporation and crystallization stage, and play the role of scraping crystals after crystallization. Compared with the existing crystallization equipment, the scraper plays the role of stirring and scraping at the same time, and always keeps in motion, which avoids the ultraviolet absorber crystals adhering to the scraper and thus cannot be scraped off by the scraper.

[0016] (2) The second and third scrapers are driven to move by collecting the condensate after evaporation. When the weight of the condensate increases, it means that the amount of ultraviolet absorber crystallization increases, which in turn drives the second and third scrapers to move. In conjunction with the second and third limiting components, the second and third scrapers scrape off the crystals.

[0017] (3) It is more energy-efficient than existing crystallization equipment that uses multiple motors to drive stirring and scraping, which is driven by a single motor. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0019] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0020] In the attached diagram:

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is the left view of the present invention;

[0023] Figure 3 for Figure 2 A cross-sectional view of AA;

[0024] Figure 4 for Figure 3 A line section view of BB;

[0025] Figure 5 for Figure 4 A magnified view of a section at point C;

[0026] Figure 6 for Figure 3 A magnified view of a section at point D;

[0027] Figure 7 for Figure 3 A line section of the EE;

[0028] Figure 8 for Figure 7 A magnified view of a section at point F in the middle;

[0029] Figure 9 for Figure 3 A magnified view of a section at point G in the middle;

[0030] Figure 10 for Figure 3 A cross-sectional view of HH in the middle;

[0031] Figure 11 for Figure 10 A magnified view of a section at point I;

[0032] Figure 12 for Figure 3 A cross-sectional view of the middle JJ;

[0033] Figure 13 for Figure 3 Linear cross-section of KK. Detailed Implementation

[0034] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0035] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0036] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0037] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0038] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] Reference Figure 1-13As shown, the ultraviolet absorber preparation device of the present invention includes a housing 1, a support column 2 fixedly disposed on the housing, a first cavity 3 fixedly disposed on the housing, an electronic control board 4 fixedly disposed on the first cavity, a drive mechanism 5 fixedly disposed on the first cavity, a second cavity 6 fixedly disposed on the housing, a crystallization mechanism 7 fixedly disposed on the second cavity, and a condensation mechanism 8 slidably disposed on the second cavity; the crystallization mechanism includes a first slide groove 71 fixedly disposed on the housing, a crystallization barrel 72 fixedly disposed on the second cavity, a first rotating shaft 73 rotatably disposed on the crystallization barrel and the first slide groove, a first support column 74 symmetrically fixedly disposed on the first rotating shaft, a second support column 75 symmetrically fixedly disposed on the first rotating shaft, and a condensation mechanism 8 fixedly disposed on the first cavity. The structure includes a first scraper 76 on the rotating shaft, a first stirring and scraping assembly 77 fixedly mounted on the first and second support pillars, a second stirring and scraping assembly 78 fixedly mounted on the second support pillar and the scraper, a first limiting assembly 79 fixedly mounted on the first and second stirring and scraping assemblies, and a heating plate 70 fixedly mounted on the crystallization tank. The control board is a control device used to control various electrical components. The drive mechanism is used to drive the crystallization mechanism to work, and the ultraviolet absorber enters the crystallization mechanism through the drive mechanism. The top of the second cavity has a smooth conical structure; water vapor condenses into water droplets upon contact with the top and slides along the conical surface into the condensation mechanism. The crystallization mechanism is used to evaporate and crystallize the ultraviolet absorber. The condensation mechanism is used to collect condensate and drive the first... A first stirring and scraping assembly and a second stirring and scraping assembly move; a crystallization tank is used to hold the ultraviolet absorber, which evaporates and crystallizes inside the crystallization tank. The crystallization tank has an inclined surface to facilitate the dissipation of water vapor during evaporation. The outer wall of the crystallization tank is equipped with heat-insulating material to prevent heat transfer to the condensation mechanism. An electromagnetic valve is located at the bottom of the crystallization tank and is controlled by an electronic control board; a first rotating shaft is driven to rotate by a drive mechanism; a first scraper rotates together with the first rotating shaft, stirring the ultraviolet absorber during evaporation and crystallization to ensure uniform heating and accelerate crystallization. During crystallization removal, it can scrape away the crystals at the bottom of the crystallization tank; the first stirring and scraping assembly is located in the upper part of the crystallization tank and stirs the ultraviolet absorber during evaporation and crystallization. The first stirring and scraping component is located in the lower part of the crystallization tank. It stirs the UV absorber during evaporation crystallization, ensuring uniform heating and accelerating crystallization. It can also scrape away the crystals in the lower part of the crystallization tank. The second stirring and scraping component connects the first and second stirring and scraping components. The first and second stirring and scraping components have different moving distances. Once the second stirring and scraping component is in position, the first limiting component is released and can continue moving. A heating plate is located on the inner wall of the crystallization tank and is used to heat the UV absorber.

[0040] The first stirring and scraping assembly includes a second chute 771 fixedly mounted on a first support column, a third chute 772 fixedly mounted on the second support column, a first stirring shaft 773 slidably mounted on the second and third chutes, a second scraper 774 rotatably mounted on the first stirring shaft, and a second limiting assembly 775 fixedly mounted on the second chute; the second and third chutes are of the same length; the second scraper is initially located at one end of the second and third chutes near the first rotating shaft, and the second scraper can rotate on the first stirring shaft; the second scraper moves... When the second and third chutes reach the ends away from the first rotating shaft, the second limiting component will limit the second scraper, allowing the second scraper to scrape off the crystals on the barrel wall. The second scraper has inclined surfaces on both sides, with the same inclination angle as the inner wall of the crystallization barrel. When scraping off crystals, it can fit against the inner wall of the crystallization barrel. The second scraper has different numbers of through grooves on both sides. When the second scraper rotates with the first rotating shaft, the two sides are subjected to different areas and different forces. Therefore, it can rotate on the first stirring shaft, making the ultraviolet absorber heat more evenly and accelerating crystallization.

[0041] The second stirring and scraping assembly includes a fourth chute 781 fixedly mounted on the second support column, a fifth chute 782 fixedly mounted on the first scraper, a second stirring shaft 783 slidably mounted on the fourth and fifth chutes, a third scraper 784 rotatably mounted on the second stirring shaft, and a third limiting assembly 785 fixedly mounted on the fourth chute; the fourth and fifth chutes are of the same length; the third scraper is initially located at one end of the fourth and fifth chutes near the first rotating shaft, and the third scraper can rotate on the second stirring shaft; the third scraper moves... When the third scraper reaches the end of the fourth and fifth chutes that is far from the first rotating shaft, the third limiting component will limit the third scraper, allowing the third scraper to scrape off the crystals on the barrel wall. The third scraper has inclined surfaces on both sides, with the same inclination angle as the inner wall of the crystallization barrel. When scraping off crystals, it can fit against the inner wall of the crystallization barrel. The third scraper has different numbers of through grooves on both sides. When the third scraper rotates with the first rotating shaft, the two sides are subjected to different areas and different forces. Therefore, it can rotate on the second stirring shaft, making the ultraviolet absorber heat more evenly and accelerating crystallization.

[0042] Specifically, the first limiting component includes a protrusion 791 fixedly disposed on the first stirring shaft, a first mounting hole 792 symmetrically fixedly disposed on the protrusion, a first limiting head 793 slidably disposed on the first mounting hole, a groove 794 fixedly disposed on the second stirring shaft, a second mounting hole 795 fixedly disposed on the second stirring shaft, a second limiting head 796 slidably disposed on the second mounting hole, a first limiting hole 797 fixedly disposed on the fourth sliding groove, and a second limiting hole 798 fixedly disposed on the groove; the first limiting head and the first mounting hole are connected by a first limiting head 791 fixedly disposed on the first stirring shaft, a first mounting hole 792 symmetrically disposed on the protrusion, a first limiting head 793 slidably disposed on the first mounting hole, a first limiting hole 794 fixedly disposed on the second stirring shaft, a second mounting hole 795 fixedly disposed on the second stirring shaft, a second limiting head 796 slidably disposed on the second mounting hole, a first limiting hole 797 fixedly disposed on the fourth sliding groove, and a second limiting hole 798 fixedly disposed on the groove; the first limiting head and the first mounting hole are connected by a first limiting head ... head 794 fixedly disposed on the fourth stirring shaft, a second limiting head 795 fixedly disposed on the fourth stirring shaft, a second limiting head 796 fixed A spring 799 is connected; the second limiting head and the second mounting hole are connected by a second spring 790; the first limiting head can slide in the first mounting hole; the second limiting hole cooperates with the first limiting head. In the initial state, the first limiting head is located in the second limiting hole, and the first stirring shaft and the second stirring shaft can move together; the second limiting head can slide in the second mounting hole. In the initial state, the second limiting head is squeezed and located in the second mounting hole. When the second stirring shaft moves to the first limiting hole, the second limiting head is pushed into the first limiting hole by the second spring.

[0043] Specifically, the second limiting assembly includes a first top block 7751 slidably disposed on the first support column, a second top block 7752 slidably disposed on the first support column, a first pressing block 7753 slidably disposed on the second top block, a first transmission block 7754 symmetrically slidably disposed on the second top block, and a first clamping block 7755 symmetrically slidably disposed on the second top block; the first top block and the first support column are connected by a third spring 7756; the second top block and the first support column are connected by a fourth spring 7757; the first pressing block and the second top block are connected by a fifth spring 7758; and the first clamping block and the second top block are connected by a sixth spring 7759; when the first stirring shaft moves away from the second chute... When the first rotating shaft is on one side, it presses the first top block. One end of the first top block has an inclined surface that fits with the inclined surface on the second top block. Therefore, the second top block is pushed by the first top block and moves downward. When the second scraper rotates and contacts the first pressing block, the first pressing block is pressed by the second scraper and moves upward. The first pressing block has an inclined surface that fits with the inclined surface on the first transmission block. Therefore, the first pressing block will push the first transmission block to move to both sides. The inclined surface on the first transmission block fits with the inclined surface on the first clamping block. The first transmission block will push the first clamping block to move downward, limiting the second scraper and preventing the second scraper from continuing to rotate. The third spring, the fourth spring, the fifth spring, and the sixth spring are used for reset.

[0044] Specifically, the third limiting component includes a third top block 7851 slidably disposed on the second support column, a fourth top block 7852 slidably disposed on the second support column, a second pressing block 7853 slidably disposed on the fourth top block, a second transmission block 7854 symmetrically slidably disposed on the fourth top block, and a second clamping block 7854 symmetrically slidably disposed on the fourth top block; the third top block and the second support column are connected by a seventh spring 7855; the fourth top block and the second support column are connected by an eighth spring 7856; the second pressing block and the fourth top block are connected by a ninth spring 7857; and the second clamping block and the fourth top block are connected by a tenth spring 7858; when the second stirring shaft moves away from the fourth chute... When the first rotating shaft is on one side, it presses the third top block. One end of the third top block has an inclined surface that fits with the inclined surface on the fourth top block. Therefore, the fourth top block is pushed by the third top block and moves downward. When the third scraper rotates and contacts the second pressing block, the second pressing block is pressed by the third scraper and moves upward. The second pressing block has an inclined surface that fits with the inclined surface on the second transmission block. Therefore, the second pressing block will push the second transmission block to move to both sides. The inclined surface on the second transmission block fits with the inclined surface on the second clamping block. The second transmission block will push the second clamping block to move downward, limiting the third scraper and preventing the second scraper from continuing to rotate. The seventh, eighth, ninth, and tenth springs are used for reset.

[0045] Specifically, the driving mechanism includes a motor 51 fixedly mounted on the first cavity, a reduction gearbox 52 fixedly mounted on the motor, a first gear 53 fixedly mounted on the reduction gearbox, a second gear 54 fixedly mounted on the first rotating shaft, a through groove 55 fixedly mounted on the first rotating shaft, a sixth sliding groove 56 fixedly mounted on the first rotating shaft, and an input pipe 57 rotatably mounted on the sixth sliding groove and fixedly mounted on the housing. When the motor operates, it drives the first gear to rotate after being reduced in speed by the reduction gearbox. The first gear meshes with the second gear, driving the second gear to rotate, which in turn drives the first rotating shaft to rotate. The first rotating shaft is provided with a through groove that connects to the input pipe. The input pipe is used to pour in the ultraviolet absorber solution. The first rotating shaft is provided with a sixth sliding groove, so that the input pipe will not rotate when the first rotating shaft rotates.

[0046] Specifically, the condensation mechanism includes a seventh slide groove 81 fixedly mounted on the housing, an eighth slide groove 82 fixedly mounted on the housing, a condensation tank 83 slidably mounted on the seventh and eighth slide grooves, a linkage assembly 86 fixedly mounted on the condensation tank and the first rotating shaft, and a circulation assembly 87 fixedly mounted on the housing. The condensation tank can slide on the seventh and eighth slide grooves to collect condensate. A touch sensor is provided at the bottom of the condensation tank. When the condensation tank contacts the bottom of the second cavity, the electronic control board controls the electromagnetic valve of the collection tank to open, discharging the crystals. The linkage assembly drives the first and second stirring assemblies to move based on the weight of the condensate collected in the condensation tank. The increased weight of the condensate in the condensation tank indicates that a large amount of water in the crystallization tank has evaporated, representing that a large amount of ultraviolet absorber has crystallized. After discharging the crystals, the circulation assembly pours the collected condensate back into the crystallization tank to clean it.

[0047] Specifically, the linkage assembly includes a first connecting rod 861 fixedly mounted on the condenser tank, a first collar 862 fixedly mounted on the first connecting rod and slidably sleeved on the first rotating shaft, a second collar 863 slidably sleeved on the first rotating shaft, a ninth sliding groove 864 fixedly mounted on the first rotating shaft, a second connecting rod 865 fixedly mounted on the second collar and slidably mounted on the ninth sliding groove, and a third connecting rod 866 rotatably mounted on the second connecting rod and rotatably mounted at one end of the first stirring shaft; the condenser tank and the shell are connected by an eleventh spring 867; when the condenser tank moves downward, it drives the first connecting rod to move downward. The first collar, slidably sleeved on the first rotating shaft, does not rotate with the first rotating shaft. The first connecting rod drives the first collar to move downward. Since the second connecting rod is slidably mounted on the ninth sliding groove and the second collar is fixedly mounted on the second connecting rod, the second connecting rod and the second collar will rotate with the first rotating shaft. The first collar pushes the second collar to move downward, the second collar drives the second connecting rod to move downward, thereby causing the third connecting rod to rotate and pushing the first stirring shaft to slide.

[0048] Specifically, the circulation assembly includes a first flexible hose 871 fixedly mounted on the housing and a water pump 872 fixedly mounted on the first cavity; the water pump and the input pipe are connected through a second flexible hose 873; the first flexible hose connects the water pump and the condenser tank; the second flexible hose connects the water pump and the input pipe; when the crystals are scraped off, the solenoid valve of the crystallization tank opens to discharge the crystals, and then the solenoid valve closes, and the water pump draws the condensate in the condenser tank to the input pipe, which then re-enters the crystallization tank to clean the inside of the crystallization tank.

[0049] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. An apparatus for preparing an ultraviolet light absorber, characterized in that: The system includes a housing (1), a support column (2) fixedly mounted on the housing, a first cavity (3) fixedly mounted on the housing, an electronic control board (4) fixedly mounted on the first cavity, a drive mechanism (5) fixedly mounted on the first cavity, a second cavity (6) fixedly mounted on the housing, a crystallization mechanism (7) fixedly mounted on the second cavity, and a condensation mechanism (8) slidably mounted on the second cavity; the crystallization mechanism includes a first slide groove (71) fixedly mounted on the housing, a crystallization tank (72) fixedly mounted on the second cavity, a first rotating shaft (73) rotatably mounted on the crystallization tank and the first slide groove, a first support column (74) symmetrically fixedly mounted on the first rotating shaft, a second support column (75) symmetrically fixedly mounted on the first rotating shaft, a first scraper (76) fixedly mounted on the first rotating shaft, and a first... The system includes a stirring and scraping assembly (77), a second stirring and scraping assembly (78) disposed on the second support column and the first scraper, a first limiting assembly (79) fixedly disposed on the first stirring and scraping assembly and the second stirring and scraping assembly, and a heating plate (70) fixedly disposed on the crystallization tank. The first support column is located above the second support column. The first scraper rotates together with the first rotating shaft and stirs the ultraviolet absorber during evaporation and crystallization, so that the ultraviolet absorber is heated evenly and the crystallization is accelerated. During the scraping of crystals, the crystals at the bottom of the crystallization tank can be scraped off. The first limiting assembly is used to connect the first stirring and scraping assembly and the second stirring and scraping assembly. The first stirring and scraping assembly and the second stirring and scraping assembly have different moving distances. When the second stirring and scraping assembly moves to the position, the first limiting assembly is released from the limit, and the first stirring and scraping assembly can continue to move. The first stirring and scraping assembly includes a second chute (771) fixedly mounted on a first support column, a third chute (772) fixedly mounted on a second support column, a first stirring shaft (773) slidably mounted on the second and third chutes, a second scraper (774) rotatably mounted on the first stirring shaft, and a second limiting assembly (775) fixedly mounted on the second chute. The second limiting assembly limits the second scraper, allowing the second scraper to scrape away the crystals on the barrel wall. The second scraper has inclined surfaces on both sides, with the same inclination angle as the inner wall of the crystallization barrel, so that it can fit against the inner wall of the crystallization barrel when scraping away crystals. The second stirring and scraping assembly includes a fourth chute (781) fixedly mounted on the second support column, a fifth chute (782) fixedly mounted on the first scraper, a second stirring shaft (783) slidably mounted on the fourth and fifth chutes, a third scraper (784) rotatably mounted on the second stirring shaft, and a third limiting assembly (785) fixedly mounted on the fourth chute. When the third scraper moves to the end of the fourth and fifth chutes away from the first rotating shaft, the third limiting assembly will limit the third scraper, so that the third scraper scrapes the crystals on the barrel wall. The third scraper has inclined surfaces on both sides, and the inclination angle is the same as that of the inner wall of the crystallization barrel, so that it can fit against the inner wall of the crystallization barrel when scraping the crystals.

2. The ultraviolet absorber preparation apparatus according to claim 1, characterized in that: The first limiting component includes a protrusion (791) fixedly disposed on the first stirring shaft, a first mounting hole (792) symmetrically fixedly disposed on the protrusion, a first limiting head (793) slidably disposed on the first mounting hole, a groove (794) fixedly disposed on the second stirring shaft, a second mounting hole (795) fixedly disposed on the second stirring shaft, a second limiting head (796) slidably disposed on the second mounting hole, a first limiting hole (797) fixedly disposed on the fourth sliding groove, and a second limiting hole (798) fixedly disposed on the groove; the first A limiting head and a first mounting hole are connected by a first spring (799); a second limiting head and a second mounting hole are connected by a second spring (790); the second limiting hole cooperates with the first limiting head. In the initial state, the first limiting head is located in the second limiting hole, and the first stirring shaft and the second stirring shaft can move together; the second limiting head can slide in the second mounting hole. In the initial state, the second limiting head is squeezed and located in the second mounting hole. When the second stirring shaft moves to the first limiting hole, the second limiting head is pushed into the first limiting hole by the second spring.

3. The ultraviolet absorber preparation apparatus according to claim 1, characterized in that: The second limiting component includes a first top block (7751) slidably disposed on the first support column, a second top block (7752) slidably disposed on the first support column, a first pressing block (7753) slidably disposed on the second top block, a first transmission block (7754) symmetrically slidably disposed on the second top block, and a first clamping block (7755) symmetrically slidably disposed on the second top block; the first top block and the first support column are connected by a third spring (7756); the second top block and the first support column are connected by a fourth spring (7757); the first pressing block and the second top block are connected by a fifth spring (7758); the first clamping block and the second top block are connected by a sixth spring (7759); one end of the first top block is provided with an inclined surface that fits against the inclined surface on the second top block; the first pressing block is provided with an inclined surface that fits against the inclined surface on the first transmission block.

4. The ultraviolet absorber preparation apparatus according to claim 1, characterized in that: The third limiting component includes a third top block (7851) slidably disposed on the second pillar, a fourth top block (7852) slidably disposed on the second pillar, a second pressing block (7853) slidably disposed on the fourth top block, a second transmission block (7854) symmetrically slidably disposed on the fourth top block, and a second clamping block (7855) symmetrically slidably disposed on the fourth top block; the third top block and the second pillar are connected by a seventh spring (7856); the fourth top block and the second pillar are connected by an eighth spring (7857); the second pressing block and the fourth top block are connected by a ninth spring (7858); the second clamping block and the fourth top block are connected by a tenth spring (7859); one end of the third top block is provided with an inclined surface that fits against the inclined surface on the fourth top block; the second pressing block is provided with an inclined surface that fits against the inclined surface on the second transmission block.

5. The ultraviolet absorber preparation apparatus according to claim 1, characterized in that: The driving mechanism includes a motor (51) fixedly mounted on the first cavity, a gearbox (52) fixedly mounted on the motor, a first gear (53) fixedly mounted on the gearbox, a second gear (54) fixedly mounted on the first rotating shaft, a through groove (55) opened on the first rotating shaft, a sixth sliding groove (56) fixedly mounted on the first rotating shaft, and an input pipe (57) rotatably mounted on the sixth sliding groove and fixedly mounted on the housing. When the motor works, it drives the first gear to rotate after being decelerated by the gearbox. The first gear meshes with the second gear, driving the second gear to rotate, and then the first rotating shaft rotates. The first rotating shaft is provided with a through groove that is connected to the input pipe.

6. The ultraviolet absorber preparation apparatus according to claim 1, characterized in that: The condensation mechanism includes a seventh slide groove (81) fixed on the housing, an eighth slide groove (82) fixed on the housing, a condensation tank (83) slidably disposed on the seventh slide groove and the eighth slide groove, a linkage assembly (86) fixed on the condensation tank and the first rotating shaft, and a circulation assembly (87) fixed on the housing.

7. The ultraviolet absorber preparation apparatus according to claim 6, characterized in that: The linkage assembly includes a first connecting rod (861) fixedly mounted on the condenser tank, a first collar (862) fixedly mounted on the first connecting rod and slidably mounted on the first rotating shaft, a second collar (863) slidably mounted on the first rotating shaft, a ninth sliding groove (864) fixedly mounted on the first rotating shaft, a second connecting rod (865) fixedly mounted on the second collar and slidably mounted on the ninth sliding groove, and a third connecting rod (866) rotatably mounted on the second connecting rod and rotatably mounted at one end of the first stirring shaft; the condenser tank and the shell are connected by an eleventh spring (867); the first connecting rod drives the first collar to move downward, and since the second connecting rod is slidably mounted on the ninth sliding groove and the second collar is fixedly mounted on the second connecting rod, the second connecting rod and the second collar will rotate together with the first rotating shaft, the first collar pushes the second collar to move downward, the second collar drives the second connecting rod to move downward, and thus the third connecting rod rotates.

8. The ultraviolet absorber preparation apparatus according to claim 6, characterized in that: The circulation assembly includes a first hose (871) fixed on the housing and a water pump (872) fixed on the first cavity; the water pump and the input pipe are connected by a second hose (873).

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