A large-capacity storage device for methyltetrahydrophthalic anhydride and its usage method

Abstract

The present invention provides a large-capacity storage device for methyltetrahydrophthalic anhydride and its usage method, which relates to the technical field of storage equipment for chemical products. It includes a storage tank. An air cavity is formed inside the storage tank, and the air cavity is communicated with an injection pipe. A central disk is fixedly installed at the center inside the storage tank. Fluororubber sealing rings are installed at both ends of the central disk. First driving motors are symmetrically arranged inside the central disk. First rotating shafts are installed on the output ends of the two first driving motors. Stirring blades are symmetrically and equidistantly installed on the two first rotating shafts. Extension plates are slidably installed inside each stirring blade. Second springs are symmetrically and fixedly installed on the side walls of each extension plate. This device realizes the integration of the stirring and dispersion functions. Through the dispersion operation, the catalyst can be evenly suspended in the methyltetrahydrophthalic anhydride in the form of single particles or extremely small aggregates, ensuring its function in the entire system and avoiding the situation of excessive local property differences in the methyltetrahydrophthalic anhydride.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical product storage equipment, and more specifically, particularly relates to a large-capacity storage device for methyltetrahydrophthalic anhydride and its usage method. Background Art

[0002] Methyltetrahydrophthalic anhydride is a novel liquid organic acid anhydride epoxy resin curing agent with excellent performance. Since acid anhydride curing agents have better heat resistance and chemical stability than amine curing agents, and can still maintain excellent physical and electrical properties at higher temperatures, methyltetrahydrophthalic anhydride is mostly stored in storage tanks.

[0003] However, the existing storage devices for methyltetrahydrophthalic anhydride still have the following deficiencies during use:

[0004] 1. Methyltetrahydrophthalic anhydride is prone to precipitation during long-term storage. After precipitation occurs, the existing storage devices lack effective stirring and mixing mechanisms, and do not have an efficient catalyst dispersion function, making it difficult for the catalyst to be evenly suspended in methyltetrahydrophthalic anhydride in the form of single particles or extremely small aggregates. This causes the function of the catalyst in the methyltetrahydrophthalic anhydride solution not to be fully exerted, and it is easy to have a situation where the local performance of methyltetrahydrophthalic anhydride varies too much.

[0005] 2. During the feeding and receiving process of the existing storage devices, the receiving position cannot be adjusted according to the size and specifications of the receiving container, resulting in easy splashing of methyltetrahydrophthalic anhydride during feeding. This not only causes waste of materials and increases production costs, but also the splashed materials may pose hazards to operators and the surrounding environment, presenting potential safety hazards. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a large-capacity storage device for methyltetrahydrophthalic anhydride and its usage method to solve the above problems.

[0007] A large-capacity storage device for methyltetrahydrophthalic anhydride, comprising a storage tank. Scale bars are provided on both sides of the storage tank. Feeding windows are symmetrically installed at the upper end of the storage tank. An air injection pipe is fixedly installed on the side wall of the storage tank. First liquid injection pipes and second liquid injection pipes are symmetrically arranged at both the upper and lower ends of the storage tank. An air cavity is formed inside the storage tank, and the air cavity is communicated with the air injection pipe. A central disk is fixedly installed at the center inside the storage tank. Fluororubber sealing rings are installed at both ends of the central disk. First driving motors are symmetrically arranged inside the central disk. First rotating shafts are installed on the output ends of the two first driving motors. The two first rotating shafts are respectively rotatably installed in the two fluororubber sealing rings. First liquid injection ports are formed on the two first rotating shafts. Stirring blades are symmetrically and equidistantly installed on the two first rotating shafts. An extension plate is slidably installed inside each stirring blade. Second springs are symmetrically and fixedly installed on the side walls of each extension plate. One end of each group of second springs away from each extension plate is fixedly connected to each stirring blade. A dispersion blade is fixedly installed on each extension plate. Stirring plates are symmetrically and fixedly installed on the two first rotating shafts. Confluence grooves are formed on the two groups of stirring plates. Second liquid injection ports communicated with the first liquid injection ports are formed inside the two groups of central disks, fluororubber sealing rings and stirring plates. Support bars are symmetrically and fixedly installed at the lower end of the storage tank. First sliding grooves are formed inside the two support bars. A control panel is fixedly installed on the support bar on the left side.

[0008] Preferably, blanking pipes are provided at both ends of the storage tank. Electric valves are installed on the two blanking pipes. Inner grooves are formed inside the two blanking pipes. Thread grooves are formed inside the two inner grooves.

[0009] Preferably, first threaded rings are threadedly installed inside the two inner grooves. External threaded drainage disks are threadedly installed inside the two thread grooves. Drainage rods are fixedly installed inside the two external threaded drainage disks. First springs are evenly and equidistantly fixedly installed at the lower end of the external threaded drainage disks.

[0010] Preferably, one end of the four first springs away from the external threaded drainage disks is fixedly installed with a first scraping plate. A second scraping plate is fixedly installed inside the inner wall of the first scraping plate. The second scraping plate is slidably sleeved on the drainage rod. Welding frames are symmetrically and fixedly installed on the two first driving motors. One end of each group of welding frames away from the first driving motor is welded inside the inner wall of the central disk.

[0011] Preferably, a connecting plate is fixedly installed between the two support bars. A U-shaped frame is fixedly installed at the upper end of the connecting plate. A second driving motor is fixedly installed at the upper end of the U-shaped frame. A second rotating shaft is installed on the output end of the second driving motor. A gear is fixedly installed at the lower end of the second rotating shaft.

[0012] Preferably, racks are slidably installed inside both of the first sliding grooves. The two racks are symmetrically distributed about the center point of the connecting plate. Side plates are fixedly installed at the opposite ends of the two support bars. Rectangular grooves are formed in both of the side plates. Fixed bars are symmetrically and fixedly installed on both of the side plates.

[0013] Preferably, lifting seats are slidably installed inside both of the rectangular grooves. Oblique grooves are formed in the opposite ends of the two lifting seats. A retaining disk is fixedly installed at the upper end of the lifting seat. Second sliding grooves are evenly and equidistantly formed inside the retaining disk.

[0014] Preferably, clamping blocks are slidably installed inside each of the second sliding grooves. Third springs are fixedly installed on each of the clamping blocks. One end of each third spring away from the clamping block is fixedly connected to the retaining disk.

[0015] Preferably, a storage tray is arranged inside the retaining disk. The storage tray is fixedly connected to the lifting seat. A threaded hole is formed inside the storage tray. A threaded post is threadedly installed inside the threaded hole. A climbing frame is fixedly installed on the storage tank and the two side plates.

[0016] In order to overcome the deficiencies of the prior art, the present invention also provides a usage method of a large-capacity storage device for methyltetrahydrophthalic anhydride, including the following steps:

[0017] S1: During use, the operator can climb the climbing frame and put methyltetrahydrophthalic anhydride with different concentrations into the storage tank through the feed window. Then, nitrogen can be injected into the air cavity through the injection pipe. Then, the first driving motor can be controlled to start through the control panel, and the two groups of stirring plates can be rotated to a vertical state. At this time, heated or cooled heat-conducting oil can be selectively injected into the first liquid injection pipe. At this time, the heat-conducting oil will be injected into the central disk, fluororubber sealing ring, first rotating shaft and the stirring plates. Under the rotation of the stirring plates, the heat-conducting oil will flow inside them. At this time, the heat-conducting oil is in full contact with the inner wall of the stirring plates, transferring heat to the stirring plates. The heated stirring plates are in direct contact with the methyltetrahydrophthalic anhydride. Due to the temperature difference, heating or cooling of the methyltetrahydrophthalic anhydride is achieved.

[0018] S2: When precipitation occurs after methyltetrahydrophthalic anhydride has been placed for a long time, the two first driving motors can be controlled to start through the control panel at this time. When there is a large amount of methyltetrahydrophthalic anhydride inside the storage tank, the two first driving motors will drive the two first rotating shafts to rotate when starting. Driven by the rotation of the two first rotating shafts, two groups of stirring blades and stirring plates will rotate accordingly, thereby stirring and mixing the methyltetrahydrophthalic anhydride inside the storage tank. When there is a small amount of methyltetrahydrophthalic anhydride inside the storage tank, the two stirring plates can be driven to rotate slowly at this time. Driven by the slow rotation of the two stirring plates, the methyltetrahydrophthalic anhydride inside the storage tank will flow to the middle through the two groups of confluence grooves for mixing. When the precipitation inside the storage tank is relatively serious after long-term storage of methyltetrahydrophthalic anhydride, a solid catalyst can be added to the storage tank at this time, and then the first rotating shaft and the stirring blades are driven by the first driving motor to stir it. The rotation speed of the first rotating shaft is increased through the control panel. At this time, the stirring blades will generate centrifugal force when rotating rapidly. Under the action of the centrifugal force, the extension plate will slide out of the stirring blade until the extension plate contacts the inner wall of the storage tank. At this time, the second spring will be stretched accordingly. At this time, the solid catalyst can be finely dispersed through the dispersion blades on the extension plate. When dispersion is not required, the rotation speed of the first rotating shaft can be restored through the control panel at this time, and then the second spring will restore its deformation and drive the extension plate to retract into the stirring blade;

[0019] S3: When receiving materials, the two threaded posts can be screwed out of the threaded holes, and then the receiving cylinder is pressed down and placed inside the retaining disc. When the receiving cylinder is pressed down, it will squeeze the clamping block, and the clamping block will drive the third spring to stretch accordingly, thereby generating a reverse elastic force. Driven by this elastic force, the clamping block will clamp and fix the receiving cylinder;

[0020] S4: Then, the second driving motor is controlled to start through the control panel. The second driving motor will drive the second rotating shaft and the gear to rotate. Driven by the rotation of the gear, the two racks will slide in opposite directions in the two first sliding grooves respectively. At this time, the two racks will slide into the two inclined grooves respectively. Under the action of the extrusion force, the two lifting seats will move upward, thereby adjusting the distance between the receiving cylinder and the blanking pipe;

[0021] S5: After the receiving cylinder is placed, the electric valve is controlled to start through the control panel. At this time, the blanking pipe will be opened, and the methyltetrahydrophthalic anhydride inside the storage tank will flow out along the blanking pipe. At this time, the methyltetrahydrophthalic anhydride will first flow to the middle along the external thread drainage disc, and then after being drained by the drainage rod, it will flow into the receiving cylinder to complete the material receiving;

[0022] S6: The liquid level of methyltetrahydrophthalic anhydride can be observed through the scale bar. When the methyltetrahydrophthalic anhydride material inside the storage tank is emptied and needs to be cleaned, clean water can be injected into the storage tank through the feed window at this time. Then, the clean water inside the storage tank is stirred by the stirring blade, thereby cleaning the inner wall of the storage tank. At this time, the two threaded columns can be reinstalled into the threaded holes. Then, the second driving motor can be started, and the gear is controlled to rotate forward and backward by the second driving motor. When the gear rotates clockwise, the two racks move away from each other. At this time, the two lifting seats move upward inside the two rectangular grooves, and the two threaded columns will also move upward accordingly. The two threaded columns will extend into the first scraper and contact the second scraper, thereby driving the second scraper and the first scraper to slide on the outer wall of the drainage rod and the inner wall of the blanking pipe respectively, thereby cleaning the outer wall of the drainage rod and the inner wall of the blanking pipe. At this time, the first spring will be compressed accordingly. When the gear rotates counterclockwise, the two racks move relative to each other. At this time, the two threaded columns will move downward, and the first spring resumes deformation, and the two second scrapers and the first scraper will also move downward. When the second scraper and the first scraper move up and down, they can clean the inside of the blanking pipe to remove the remaining methyltetrahydrophthalic anhydride.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] In the present invention, by providing a storage tank, an injection gas pipe, a gas chamber, a first driving motor, a first rotating shaft, stirring blades, an extension plate, a second spring, dispersing blades, a stirring plate, a confluence trough and a control panel, it can achieve the effect of classifying and storing methyltetrahydrophthalic anhydride with different concentrations, and nitrogen can be injected into the gas chamber through the injection gas pipe to block the intrusion of external moisture and achieve the moisture-proof effect. When precipitation occurs after methyltetrahydrophthalic anhydride is stored for a long time, the two first driving motors can be controlled to start through the control panel at this time. When the amount of methyltetrahydrophthalic anhydride in the storage tank is large, the two first rotating shafts will be driven to rotate under the start of the two first driving motors at this time. With the rotation of the two first rotating shafts, two groups of stirring blades and the stirring plate will be driven to rotate accordingly, thereby stirring and mixing the methyltetrahydrophthalic anhydride in the storage tank. When the amount of methyltetrahydrophthalic anhydride in the storage tank is small, the two stirring plates can be driven to rotate slowly at this time. Under the slow rotation of the two stirring plates, the methyltetrahydrophthalic anhydride in the storage tank will flow to the middle through the two groups of confluence troughs for mixing. By controlling the flow direction of methyltetrahydrophthalic anhydride, the mixing and anti-precipitation effect of the equipment is enhanced. When the precipitation in the storage tank is relatively serious after long-term storage of methyltetrahydrophthalic anhydride, a solid catalyst can be added to the storage tank at this time, and then the first rotating shaft and the stirring blades are driven by the first driving motor to stir it. The rotation speed of the first rotating shaft is increased through the control panel. At this time, the stirring blades will generate centrifugal force under the rapid rotation. Under the action of the centrifugal force, the extension plate will slide out of the stirring blade until the extension plate contacts the inner wall of the storage tank. At this time, the second spring will be stretched accordingly. The solid catalyst can be finely dispersed through the dispersing blades on the extension plate at this time. When dispersion is not required, the rotation speed of the first rotating shaft can be restored through the control panel at this time. Furthermore, the second spring will restore its deformation and drive the extension plate to retract into the stirring blade. The equipment realizes the integration of stirring and dispersing functions. Through the dispersion operation, the catalyst can be evenly suspended in methyltetrahydrophthalic anhydride in the form of single particles or extremely small aggregates, ensuring its function in the whole system and avoiding the situation of too large local performance differences in methyltetrahydrophthalic anhydride.

[0025] In the present invention, by providing a first liquid injection pipe, a central disc, a first rotating shaft, a stirring plate and a fluororubber sealing ring, heated or cooled heat-conducting oil can be selectively injected into the first liquid injection pipe at this time. The heat-conducting oil will be injected into the central disc, the fluororubber sealing ring, the first rotating shaft and the stirring plate. Under the rotation of the stirring plate, the heat-conducting oil will flow inside it. At this time, the heat-conducting oil is in full contact with the inner wall of the stirring plate, transferring heat to the stirring plate. The heated stirring plate is in direct contact with methyltetrahydrophthalic anhydride. Due to the temperature difference, heating or cooling of methyltetrahydrophthalic anhydride is realized. During the rotation and stirring process of the stirring plate, it continuously contacts methyltetrahydrophthalic anhydride at different positions, making the heating or cooling of the material more uniform. For example, when preventing the crystallization of methyltetrahydrophthalic anhydride during storage, the material temperature can be controlled within a suitable range in this way;

[0026] In the present invention, by providing a storage tank, a feeding pipe, an external-thread drainage plate, a drainage rod and a control panel, the electric valve can be controlled to start through the control panel. At this time, the feeding pipe will be opened, and the methyltetrahydrophthalic anhydride inside the storage tank will flow out along the feeding pipe. At this time, the methyltetrahydrophthalic anhydride will first flow along the external-thread drainage plate to the middle, and then flow down after being drained by the drainage rod, so that the equipment is not likely to splash during the feeding of methyltetrahydrophthalic anhydride, enhancing the safety of feeding and effectively avoiding the waste of methyltetrahydrophthalic anhydride;

[0027] In the present invention, by providing a feeding pipe, a first chute, a control panel, a second driving motor, a second rotating shaft, a gear, a rack, a lifting seat, an inclined chute, a retaining plate, a clamping block, a third spring, a threaded hole and a threaded column, when receiving materials, the two threaded columns can be first screwed out of the threaded holes, and then the receiving cylinder can be pressed down and placed inside the retaining plate. When the receiving cylinder is pressed down, it will squeeze the clamping block, and the clamping block will drive the third spring to stretch accordingly, and then generate a reverse elastic force. Under the action of this elastic force, the clamping block will clamp and fix the receiving cylinder, effectively preventing it from being misaligned during the material receiving process and enhancing the accuracy of material receiving; at this time, the second driving motor can also be controlled to start through the control panel. The second driving motor will drive the second rotating shaft and the gear to rotate. Under the rotation of the gear, the two racks will slide in the two first chutes in opposite directions respectively. At this time, the two racks will slide into the two inclined chutes respectively, and the two lifting seats will move upward under the action of the extrusion force, so that the equipment can adjust the distance between the receiving cylinder and the feeding pipe according to needs. Through the adjustment, the methyltetrahydrophthalic anhydride material can smoothly fall into the receiving cylinder, further reducing the occurrence of splashing phenomenon, thereby reducing the waste of materials;

[0028] In the present invention, by providing a storage tank, a feeding window, a blanking pipe, a drainage rod, a first spring, a first scraper, a second scraper, stirring blades, a second driving motor, gears, racks, rectangular grooves, lifting seats, threaded holes and threaded columns, clean water can be injected into the interior of the storage tank through the feeding window, and then the clean water inside the storage tank can be stirred by the stirring blades, thereby cleaning the inner wall of the storage tank. At this time, the two threaded columns can be reinstalled into the threaded holes, and then the second driving motor can be started to control the forward and reverse rotation of the gears. When the gears rotate clockwise, the two racks move away from each other. At this time, the two lifting seats move upward inside the two rectangular grooves, and the two threaded columns will also move upward accordingly. The two threaded columns will extend into the first scraper and contact the second scraper, thereby driving the second scraper and the first scraper to slide on the outer wall of the drainage rod and the inner wall of the blanking pipe respectively, thereby cleaning the outer wall of the drainage rod and the inner wall of the blanking pipe. At this time, the first spring will be compressed accordingly. When the gears rotate counterclockwise, the two racks move relative to each other. At this time, the two threaded columns will move downward, and the first spring will return to its original shape, and the two second scrapers and the first scraper will also move downward. When the second scraper and the first scraper move up and down, they can clean the inside of the blanking pipe, removing the residual methyltetrahydrophthalic anhydride. This self-cleaning function can reduce the workload of manual cleaning, ensure the smoothness of the discharge channel, reduce the risk of cross-contamination of materials, and improve the performance of the storage equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0030] Figure 2 is a schematic diagram of the connection structure of the storage tank of the present invention;

[0031] Figure 3 is a schematic sectional structure diagram of the storage tank of the present invention;

[0032] Figure 4 is an exploded connection structure schematic diagram of the drainage rod of the present invention;

[0033] Figure 5 is an exploded connection structure schematic diagram of the central disk of the present invention;

[0034] Figure 6 is an exploded connection structure schematic diagram of the stirring blade of the present invention;

[0035] Figure 7 is an exploded connection structure schematic diagram of the connecting plate of the present invention;

[0036] Figure 8 is an exploded connection structure schematic diagram of the lifting seat of the present invention;

[0037] Figure 9 is an exploded connection structure schematic diagram of the clamping block of the present invention.

[0038] In the figure, the correspondence between the component names and the drawing numbers is as follows: 11, storage tank; 12, scale bar; 13, feed window; 14, gas injection pipe; 15, first liquid injection pipe; 16, second liquid injection pipe; 17, gas chamber; 21, blanking pipe; 22, electric valve; 23, inner groove; 24, threaded groove; 25, first threaded ring; 26, externally threaded drainage tray; 27, drainage rod; 28, first spring; 29, first scraper; 31, second scraper; 32, central plate; 33, first drive motor; 34, welding frame; 35, first rotating shaft; 36, first liquid injection port; 37, stirring blade; 38, extension plate; 39, second spring; 41, dispersion blade; 42, stirring plate; 43, confluence trough; 51, support bar; 52, first chute; 53, control panel; 54, connecting plate; 55, U-shaped frame; 56, second drive motor; 57, second rotating shaft; 58, gear; 59, rack; 61, side plate; 62, rectangular groove; 63, fixing bar; 64, lifting seat; 65, inclined chute; 66, retaining disc; 67, second chute; 68, clamping block; 69, third spring; 71, storage tray; 72, threaded hole; 73, threaded column; 74, climbing frame; 75, fluororubber sealing ring. Detailed implementation mode

[0039] The following further describes the implementation mode of the present invention in detail in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0040] Please refer to Figures 1-9, the present invention provides a large-capacity storage device for methyltetrahydrophthalic anhydride, including a storage tank 11. Scale bars 12 are provided on both sides of the storage tank 11. Feeding windows 13 are symmetrically installed at the upper end of the storage tank 11. An injection gas pipe 14 is fixedly installed on the side wall of the storage tank 11. The upper and lower ends of the storage tank 11 are symmetrically provided with a first liquid injection pipe 15 and a second liquid injection pipe 16. An air cavity 17 is formed inside the storage tank 11, and the air cavity 17 is communicated with the injection gas pipe 14. A central disk 32 is fixedly installed at the center inside the storage tank 11. Fluororubber sealing rings 75 are installed at both ends of the central disk 32. First driving motors 33 are symmetrically arranged inside the central disk 32. First rotating shafts 35 are installed on the output ends of the two first driving motors 33. The two first rotating shafts 35 are respectively rotatably installed in the two fluororubber sealing rings 75. First liquid injection ports 36 are formed on the two first rotating shafts 35. Stirring blades 37 are symmetrically and equidistantly installed on the two first rotating shafts 35. Extension plates 38 are slidably installed inside each stirring blade 37. Second springs 39 are symmetrically and fixedly installed on the side walls of each extension plate 38. One end of each group of second springs 39 away from each extension plate 38 is fixedly connected to each stirring blade 37. Dispersion blades 41 are fixedly installed on each extension plate 38. Stirring plates 42 are symmetrically and fixedly installed on the two first rotating shafts 35. Confluence grooves 43 are formed on the two groups of stirring plates 42. Second liquid injection ports communicated with the first liquid injection ports 36 are formed inside the two groups of central disks 32, fluororubber sealing rings 75 and stirring plates 42. Support bars 51 are symmetrically and fixedly installed at the lower end of the storage tank 11. First chutes 52 are formed inside the two support bars 51. A control panel 53 is fixedly installed on the support bar 51 on the left side.

[0041] Preferably, blanking pipes 21 are provided at both ends of the storage tank 11. Electric valves 22 are installed on the two blanking pipes 21. Inner grooves 23 are formed inside the two blanking pipes 21. Thread grooves 24 are formed inside the two inner grooves 23.

[0042] Preferably, first threaded rings 25 are threadedly installed inside the two inner grooves 23. External threaded drainage disks 26 are threadedly installed inside the two thread grooves 24. Drainage rods 27 are fixedly installed inside the two external threaded drainage disks 26. First springs 28 are evenly and equidistantly fixedly installed at the lower end of the external threaded drainage disks 26.

[0043] Preferably, one end of the four first springs 28 away from the external threaded drainage disks 26 is fixedly installed with a first scraping plate 29. A second scraping plate 31 is fixedly installed inside the inner wall of the first scraping plate 29. The second scraping plate 31 is slidably sleeved on the drainage rod 27. Welding frames 34 are symmetrically and fixedly installed on the two first driving motors 33. One end of the two groups of welding frames 34 away from the first driving motors 33 is welded inside the inner wall of the central disk 32.

[0044] Preferably, a connecting plate 54 is fixedly installed between the two support bars 51. A U-shaped frame 55 is fixedly installed at the upper end of the connecting plate 54. A second driving motor 56 is fixedly installed at the upper end of the U-shaped frame 55. A second rotating shaft 57 is installed at the output end of the second driving motor 56. A gear 58 is fixedly installed at the lower end of the second rotating shaft 57.

[0045] Preferably, racks 59 are slidably installed inside the two first sliding grooves 52. The two racks 59 are symmetrically distributed with the center point of the connecting plate 54 as the center. Side plates 61 are fixedly installed at the opposite ends of the two support bars 51. Rectangular grooves 62 are formed in the two side plates 61. Fixed bars 63 are symmetrically and fixedly installed on the two side plates 61.

[0046] Preferably, lifting seats 64 are slidably installed inside the two rectangular grooves 62. Inclined grooves 65 are formed at the opposite ends of the two lifting seats 64. A retaining disk 66 is fixedly installed at the upper end of the lifting seat 64. Second sliding grooves 67 are evenly and equidistantly formed inside the retaining disk 66.

[0047] Preferably, clamping blocks 68 are slidably installed inside each of the second sliding grooves 67. A third spring 69 is fixedly installed on each clamping block 68. One end of each third spring 69 away from the clamping block 68 is fixedly connected to the retaining disk 66.

[0048] Preferably, a storage tray 71 is arranged inside the retaining disk 66. The storage tray 71 is fixedly connected to the lifting seat 64. A threaded hole 72 is formed inside the storage tray 71. A threaded column 73 is threadedly installed inside the threaded hole 72. A climbing frame 74 is fixedly installed on the storage tank 11 and the two side plates 61.

[0049] In order to overcome the deficiencies of the prior art, the present invention also provides a usage method of a large-capacity storage device for methyltetrahydrophthalic anhydride, including the following steps:

[0050] S1: When in use, the operator can climb the climbing frame 74 and put methyltetrahydrophthalic anhydride with different concentrations into the storage tank 11 through the feed window 13. Then, nitrogen can be injected into the air cavity 17 through the injection pipe 14. Then, the first driving motor 33 can be controlled to start through the control panel 53 to rotate the two groups of stirring plates 42 to the vertical state. At this time, heated or cooled heat-conducting oil can be selectively injected into the first liquid injection pipe 15. At this time, the heat-conducting oil will be injected into the central disk 32, fluororubber sealing ring 75, first rotating shaft 35 and stirring plate 42. Under the rotation of the stirring plate 42, the heat-conducting oil will flow inside it. At this time, the heat-conducting oil is in full contact with the inner wall of the stirring plate 42, transferring heat to the stirring plate 42. The heated stirring plate 42 is in direct contact with the methyltetrahydrophthalic anhydride. Due to the temperature difference, heating or cooling of the methyltetrahydrophthalic anhydride is achieved.

[0051] S2: When precipitation occurs after methyltetrahydrophthalic anhydride has been placed for a long time, the two first driving motors 33 can be controlled to start through the control panel 53. When there is a large amount of methyltetrahydrophthalic anhydride inside the storage tank 11, the two first driving motors 33 will drive the two first rotating shafts 35 to rotate when started. With the rotation of the two first rotating shafts 35, the two groups of stirring blades 37 and the stirring plates 42 will be driven to rotate accordingly, thereby stirring and mixing the methyltetrahydrophthalic anhydride inside the storage tank 11. When there is a small amount of methyltetrahydrophthalic anhydride inside the storage tank 11, the two stirring plates 42 can be driven to rotate slowly. With the slow rotation of the two stirring plates 42, the methyltetrahydrophthalic anhydride inside the storage tank 11 will flow to the middle through the two groups of confluence grooves 43 for mixing. When the precipitation inside the storage tank 11 is relatively serious after long-term storage of methyltetrahydrophthalic anhydride, a solid catalyst can be added to the storage tank 11 at this time, and then the first rotating shaft 35 and the stirring blades 37 are driven by the first driving motor 33 to stir it. The rotation speed of the first rotating shaft 35 is increased through the control panel 53. At this time, the stirring blades 37 will generate a centrifugal force during rapid rotation. Under the action of the centrifugal force, the extension plate 38 will slide out of the stirring blade 37 until the extension plate 38 contacts the inner wall of the storage tank 11. At this time, the second spring 39 will be stretched accordingly. At this time, the solid catalyst can be finely dispersed through the dispersion blades 41 on the extension plate 38. When dispersion is not required, the rotation speed of the first rotating shaft 35 can be restored through the control panel 53. Furthermore, the second spring 39 will recover its deformation and drive the extension plate 38 to retract into the stirring blade 37;

[0052] S3: When receiving materials, the two threaded columns 73 can be unscrewed from the threaded holes 72, and then the receiving cylinder is pressed downward and placed inside the retaining plate 66. When the receiving cylinder is pressed downward, it will squeeze the clamping block 68, and the clamping block 68 will drive the third spring 69 to be stretched accordingly, thereby generating a reverse elastic force. Under the action of this elastic force, the clamping block 68 is driven to clamp and fix the receiving cylinder;

[0053] S4: Then, the second driving motor 56 is controlled to start through the control panel 53. The second driving motor 56 will drive the second rotating shaft 57 and the gear 58 to rotate. With the rotation of the gear 58, the two racks 59 will be driven to slide in the two first sliding grooves 52 in opposite directions respectively. At this time, the two racks 59 will slide into the two inclined grooves 65 respectively. Under the action of the extrusion force, the two lifting seats 64 will move upward, thereby adjusting the distance between the receiving cylinder and the material discharge pipe 21;

[0054] S5: After the receiving cylinder is placed, the electric valve 22 is controlled to start through the control panel 53. At this time, the material discharge pipe 21 will be opened, and the methyltetrahydrophthalic anhydride inside the storage tank 11 will flow out along the material discharge pipe 21. At this time, the methyltetrahydrophthalic anhydride will first flow along the external thread drainage plate 26 to the middle, and then be drained through the drainage rod 27 and flow into the receiving cylinder to complete the material receiving;

[0055] S6: The liquid level of methyltetrahydrophthalic anhydride can be observed through the scale bar 12. When the methyltetrahydrophthalic anhydride material inside the storage tank 11 is emptied and needs to be cleaned, clean water can be injected into the storage tank 11 through the feed window 13 at this time. Then, the clean water inside the storage tank 11 is stirred by the stirring blade 37, thereby cleaning the inner wall of the storage tank 11. At this time, the two threaded posts 73 can be reinstalled into the threaded holes 72. Then, the second drive motor 56 can be started, and the forward and reverse rotation of the gear 58 is controlled by the second drive motor 56. When the gear 58 rotates clockwise, the two racks 59 move away from each other. At this time, the two lifting seats 64 move upward inside the two rectangular grooves 62, and the two threaded posts 73 will also move upward accordingly. The two threaded posts 73 will extend into the first scraper 29 and contact the second scraper 31, thereby driving the second scraper 31 and the first scraper 29 to slide on the outer wall of the drainage rod 27 and the inner wall of the blanking pipe 21 respectively, thereby cleaning the outer wall of the drainage rod 27 and the inner wall of the blanking pipe 21. At this time, the first spring 28 will be compressed accordingly. When the gear 58 rotates counterclockwise, the two racks 59 move relative to each other. At this time, the two threaded posts 73 will move downward, and the first spring 28 resumes deformation, and the two second scrapers 31 and the first scraper 29 will also move downward. When the second scraper 31 and the first scraper 29 move up and down, they can clean the inside of the blanking pipe 21 to remove the remaining methyltetrahydrophthalic anhydride.

[0056] Working principle:

[0057] First step, when in use, the operator can climb the climbing frame 74 and input methyltetrahydrophthalic anhydride with different concentrations into the storage tank 11 through the feeding window 13. The methyltetrahydrophthalic anhydride with different concentrations will be separated by the central disk 32. By designing the storage tank 11 as a partitioned type, it can achieve the effect of classifying and storing methyltetrahydrophthalic anhydride with different concentrations. Then, nitrogen can be injected into the air cavity 17 through the injection pipe 14 to block the intrusion of external moisture and achieve the moisture-proof effect. When the methyltetrahydrophthalic anhydride precipitates after being placed for a long time, at this time, the operator can control the start of two first driving motors 33 through the control panel 53. When the amount of methyltetrahydrophthalic anhydride in the storage tank 11 is large, at this time, the two first driving motors 33 will drive the two first rotating shafts 35 to rotate when started. With the rotation of the two first rotating shafts 35, two groups of stirring blades 37 and stirring plates 42 will rotate accordingly, thereby stirring and mixing the methyltetrahydrophthalic anhydride in the storage tank 11. When the amount of methyltetrahydrophthalic anhydride in the storage tank 11 is small, at this time, the two stirring plates 42 can be driven to rotate slowly. With the slow rotation of the two stirring plates 42, the methyltetrahydrophthalic anhydride in the storage tank 11 will flow to the middle through two groups of confluence grooves 43 for mixing. By controlling the flow direction of the methyltetrahydrophthalic anhydride, the mixing and anti-precipitation effect of the equipment is enhanced. When the precipitation in the storage tank 11 is relatively serious after long-term storage of methyltetrahydrophthalic anhydride, at this time, a solid catalyst can be added into the storage tank 11, and then the first rotating shaft 35 and the stirring blade 37 are driven by the first driving motor 33 to stir it. The control panel 53 is used to control the first rotating shaft 35 to increase the rotation speed. At this time, the stirring blade 37 will generate a centrifugal force when rotating rapidly. Under the action of the centrifugal force, the extension plate 38 will slide out of the stirring blade 37 until the extension plate 38 contacts the inner wall of the storage tank 11. At this time, the second spring 39 will be stretched accordingly. At this time, the solid catalyst can be finely dispersed by the dispersion blades 41 on the extension plate 38. When dispersion is not required, at this time, the control panel 53 can be used to control the first rotating shaft 35 to restore the rotation speed. Furthermore, the second spring 39 will restore its deformation and drive the extension plate 38 to retract into the stirring blade 37. The equipment realizes the integration of the stirring and dispersion functions. Through the dispersion operation, the catalyst can be uniformly suspended in the methyltetrahydrophthalic anhydride in the form of single particles or extremely small aggregates, ensuring its role in the whole system and avoiding the situation of too large local performance differences in the methyltetrahydrophthalic anhydride;

[0058] Second step: When in use, the first driving motor 33 can be controlled to start through the control panel 53, and the two groups of stirring plates 42 are rotated to the vertical state. At this time, heated or cooled heat-conducting oil can be selectively injected into the first liquid injection pipe 15. At this time, the heat-conducting oil will be injected into the central disk 32, fluororubber sealing ring 75, first rotating shaft 35 and stirring plate 42. Under the rotation of the stirring plate 42, the heat-conducting oil will flow inside it. At this time, the heat-conducting oil is in full contact with the inner wall of the stirring plate 42, transferring heat to the stirring plate 42. The heated stirring plate 42 is in direct contact with methyltetrahydrophthalic anhydride. Due to the temperature difference, heating or cooling of methyltetrahydrophthalic anhydride is achieved. During the rotation and stirring process of the stirring plate 42, it continuously contacts methyltetrahydrophthalic anhydride at different positions, making the heating or cooling of the material more uniform. For example, when preventing the crystallization of methyltetrahydrophthalic anhydride during storage, the temperature of the material can be controlled within a suitable range in this way;

[0059] Third step: When discharging is required, the electric valve 22 can be controlled to start through the control panel 53 at this time. At this time, the discharge pipe 21 will be opened, and the methyltetrahydrophthalic anhydride inside the storage tank 11 will flow out along the discharge pipe 21. At this time, the methyltetrahydrophthalic anhydride will first flow along the external thread drainage disk 26 to the middle, and then flow down after being drained by the drainage rod 27, making it not easy to splash when the methyltetrahydrophthalic anhydride is discharged, enhancing the safety of discharging, and effectively avoiding the waste of methyltetrahydrophthalic anhydride;

[0060] Fourth step: When receiving materials, the two threaded columns 73 can be first screwed out from the threaded holes 72, and then the receiving cylinder can be pressed down and placed inside the retaining disk 66. When the receiving cylinder is pressed down, it will squeeze the clamping block 68, and the clamping block 68 will drive the third spring 69 to stretch accordingly, generating a reverse elastic force. Under the action of this elastic force, the clamping block 68 is driven to clamp and fix the receiving cylinder, effectively preventing it from being misaligned during the material receiving process and enhancing the accuracy of material receiving; At this time, the second driving motor 56 can also be controlled to start through the control panel 53. The second driving motor 56 will drive the second rotating shaft 57 and the gear 58 to rotate. Under the rotation of the gear 58, the two racks 59 will slide in the two first sliding grooves 52 in opposite directions respectively. At this time, the two racks 59 will slide into the two inclined grooves 65 respectively. Under the action of the extrusion force, the two lifting seats 64 will move upward, enabling the device to adjust the distance between the receiving cylinder and the discharge pipe 21 according to requirements. Through adjustment, the methyltetrahydrophthalic anhydride material can fall smoothly into the receiving cylinder, further reducing the occurrence of splashing phenomenon, thereby reducing the waste of materials;

[0061] Step 5: During use, the liquid level of methyltetrahydrophthalic anhydride can be observed through the scale bar 12. When the methyltetrahydrophthalic anhydride material inside the storage tank 11 is emptied and needs to be cleaned, clean water can be injected into the storage tank 11 through the feed window 13 at this time. Then, the clean water inside the storage tank 11 is stirred by the stirring blade 37, thereby cleaning the inner wall of the storage tank 11. At this time, the two threaded posts 73 can be reinstalled into the threaded holes 72. Then, the second drive motor 56 can be started, and the forward and reverse rotation of the gear 58 is controlled by the second drive motor 56. When the gear 58 rotates clockwise, the two racks 59 move away from each other. At this time, the two lifting seats 64 move upward inside the two rectangular grooves 62, and the two threaded posts 73 will also move upward accordingly. The two threaded posts 73 will extend into the first scraper 29 and contact the second scraper 31, thereby driving the second scraper 31 and the first scraper 29 to slide on the outer wall of the drainage rod 27 and the inner wall of the blanking pipe 21 respectively, thereby cleaning the outer wall of the drainage rod 27 and the inner wall of the blanking pipe 21. At this time, the first spring 28 will be compressed accordingly. When the gear 58 rotates counterclockwise, the two racks 59 move relative to each other. At this time, the two threaded posts 73 will move downward, and the first spring 28 returns to its deformed state, and the two second scrapers 31 and the first scraper 29 will also move downward. When the second scraper 31 and the first scraper 29 move up and down, they can clean the inside of the blanking pipe 21 to remove the residual methyltetrahydrophthalic anhydride. This self-cleaning function can reduce the manual cleaning workload, ensure the smoothness of the discharge channel, reduce the risk of material cross-contamination, and improve the service performance of the storage equipment.

[0062] The embodiments of the present invention are given for the purposes of illustration and description, and are not exhaustive or limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for specific purposes.

Claims

1. A large-capacity storage device for methyltetrahydrophthalic anhydride, comprising a storage tank (11), scale bars (12) being arranged on both sides of the storage tank (11), and a feed window (13) being symmetrically arranged at the upper end of the storage tank (11), characterized in that: An air injection pipe (14) is fixedly mounted on the side wall of the storage tank (11); a first liquid injection pipe (15) and a second liquid injection pipe (16) are symmetrically arranged at the upper and lower ends of the storage tank (11); an air cavity (17) is provided inside the storage tank (11); the air cavity (17) is in communication with the air injection pipe (14); A center disk (32) is fixedly installed at the center of the storage tank (11), and fluororubber sealing rings (75) are installed at both ends of the center disk (32). A first drive motor (33) is symmetrically arranged inside the center disk (32), and a first rotating shaft (35) is installed on the output end of the two first drive motors (33). The two first rotating shafts (35) are rotatably installed in the two fluororubber sealing rings (75), respectively. A first liquid injection port (36) is opened on the two first rotating shafts (35), and stirring blades (37) are symmetrically and equidistantly installed on the two first rotating shafts (35). An extension plate (38) is slidably installed inside each stirring blade (37), and a second spring (39) is symmetrically and fixedly installed on the side wall of each extension plate (38). , one end of each group of the second springs (39) away from each extension plate (38) is fixedly connected to each stirring blade (37), each extension plate (38) is fixedly mounted with a dispersion blade (41), stirring plates (42) are symmetrically fixedly mounted on the two first rotating shafts (35), and confluence grooves (43) are provided on the two groups of stirring plates (42). Second liquid injection ports connected to the first liquid injection ports (36) are provided inside the two groups of the center plates (32), the fluororubber sealing rings (75) and the stirring plates (42), and support bars (51) are symmetrically fixedly mounted on the lower end of the storage tank (11), and first slide grooves (52) are provided inside the two support bars (51), and a control panel (53) is fixedly mounted on the support bar (51) located on the left.

2. A large-capacity storage device for methyltetrahydrophthalic anhydride as claimed in claim 1, characterized in that: Both ends of the storage tank (11) are provided with a feed pipe (21), and both feed pipes (21) are equipped with an electric valve (22); Wherein, the two feeding tubes (21) are each provided with an inner groove (23), and the two inner grooves (23) are each provided with a thread groove (24).

3. A large-capacity storage device for methyltetrahydrophthalic anhydride as claimed in claim 2, characterized in that: The two inner grooves (23) are both threadedly mounted with a first threaded ring (25), and the two threaded grooves (24) are both threadedly mounted with an external threaded drainage disc (26); Wherein, drainage rods (27) are fixedly installed inside the two externally threaded drainage discs (26), and first springs (28) are fixedly installed at the lower ends of the externally threaded drainage discs (26) at even intervals.

4. A large-capacity storage device for methyltetrahydrophthalic anhydride as claimed in claim 3, characterized in that: A first scraper (29) is fixedly mounted on one end of the four first springs (28) away from the external thread drainage plate (26); a second scraper (31) is fixedly mounted on the inner wall of the first scraper (29); and the second scraper (31) is slidably sleeved on the drainage rod (27); Wherein, welding frames (34) are symmetrically fixedly mounted on the two first drive motors (33), and ends of the two sets of welding frames (34) away from the first drive motors (33) are welded to the inner wall of the central disk (32).

5. A large-capacity storage device for methyltetrahydrophthalic anhydride as claimed in claim 1, characterized in that: A connecting plate (54) is fixedly mounted between the two support bars (51), a U-shaped frame (55) is fixedly mounted on the upper end of the connecting plate (54), and a second driving motor (56) is fixedly mounted on the upper end of the U-shaped frame (55); Wherein, a second rotating shaft (57) is mounted on the output end of the second driving motor (56), and a gear (58) is fixedly mounted on the lower end of the second rotating shaft (57).

6. A large-capacity storage device for methyltetrahydrophthalic anhydride as claimed in claim 5, characterized in that: Racks (59) are slidably mounted inside the two first sliding grooves (52), and the two racks (59) are symmetrically distributed around the center point of the connecting plate (54); Wherein, a side plate (61) is fixedly mounted on the ends of the two support bars (51) that are away from each other, a rectangular groove (62) is provided on the two side bars (61), and a fixing bar (63) is symmetrically fixedly mounted on the two side bars (61).

7. A large-capacity storage device for methyltetrahydrophthalic anhydride as claimed in claim 6, characterized in that: A lifting seat (64) is slidably mounted inside the two rectangular grooves (62), and an inclined groove (65) is provided on the opposite ends of the two lifting seats (64); A baffle plate (66) is fixedly mounted on the upper end of the lifting seat (64), and second slide grooves (67) are evenly and equidistantly arranged inside the baffle plate (66).

8. A large-capacity storage device for methyltetrahydrophthalic anhydride as claimed in claim 7, characterized in that: A clamping block (68) is slidably mounted inside each of the second sliding grooves (67); Wherein, a third spring (69) is fixedly mounted on each clamping block (68), and one end of each third spring (69) away from the clamping block (68) is fixedly connected to the baffle plate (66).

9. A large-capacity storage device for methyltetrahydrophthalic anhydride as claimed in claim 8, characterized in that: A storage tray (71) is disposed inside the baffle plate (66), the storage tray (71) is fixedly connected to the lifting seat (64), and a threaded hole (72) is provided inside the storage tray (71); A threaded column (73) is threadedly installed inside the threaded hole (72), and a climbing frame (74) is fixedly installed on the storage tank (11) and the two side plates (61).

10. The method for using a large-capacity storage device for methyltetrahydrophthalic anhydride according to claim 1, characterized in that: The following steps are involved: S1: When in use, the operator can climb the climbing frame (74) and put different concentrations of methyltetrahydrophthalic anhydride into the storage tank (11) through the feeding window (13), and then inject nitrogen into the air cavity (17) through the gas injection pipe (14). Then, the first driving motor (33) can be controlled to start through the control panel (53) to rotate the two sets of stirring plates (42) to a vertical state. At this time, the heated or cooled heat transfer oil can be selectively injected into the first liquid injection pipe (15). At this time, the heat transfer oil will be injected into the central disk (32), the fluororubber sealing ring (75), the first rotating shaft (35) and the stirring plate (42). Under the rotation of the stirring plate (42), the heat transfer oil will flow inside it. At this time, the heat transfer oil is fully in contact with the inner wall of the stirring plate (42), and the heat is transferred to the stirring plate (42). The heated stirring plate (42) is in direct contact with the methyltetrahydrophthalic anhydride. Due to the temperature difference, the methyltetrahydrophthalic anhydride is heated or cooled; S2: When the methyltetrahydrophthalic anhydride is left for a long time and precipitates, the two first drive motors (33) can be controlled to start through the control panel (53). When the amount of methyltetrahydrophthalic anhydride in the storage tank (11) is large, the two first drive motors (33) will drive the two first rotating shafts (35) to rotate. The rotation of the two first rotating shafts (35) will drive the two sets of stirring blades (37) and the stirring plate (42) to rotate accordingly, thereby stirring and mixing the methyltetrahydrophthalic anhydride in the storage tank (11). When the amount of methyltetrahydrophthalic anhydride in the storage tank (11) is small, the two stirring plates (42) can be driven to rotate slowly. Under the slow rotation of the two stirring plates (42), the methyltetrahydrophthalic anhydride in the storage tank (11) will flow to the middle through the two sets of confluence grooves (43) to mix. When the methyltetrahydrophthalic anhydride is precipitated in the storage tank (11) after long-term storage, the two first rotating shafts (35) will drive the two stirring blades (37) and the stirring plate (42) to rotate accordingly. When the sedimentation is serious, a solid catalyst can be added to the storage tank (11), and then the first drive motor (33) drives the first rotating shaft (35) and the stirring blade (37) to stir the solid catalyst. The control panel (53) controls the first rotating shaft (35) to increase its speed. The stirring blade (37) generates centrifugal force under the rapid rotation. Under the action of the centrifugal force, the extension plate (38) slides out of the stirring blade (37) until the extension plate (38) contacts the inner wall of the storage tank (11). At this time, the second spring (39) will be stretched. At this time, the dispersion blade (41) on the extension plate (38) can be used to finely disperse the solid catalyst. When dispersion is not required, the control panel (53) can be used to control the first rotating shaft (35) to resume its speed, and the second spring (39) will recover its deformation to drive the extension plate (38) to retract into the stirring blade (37). S3: When receiving the material, the two threaded columns (73) can be screwed out of the threaded holes (72), and then the receiving barrel can be pressed downward and placed inside the baffle (66). When the receiving barrel is pressed downward, it will squeeze the clamping block (68), and the clamping block (68) will drive the third spring (69) to stretch, thereby generating a reverse elastic force, and under the action of the elastic force, the clamping block (68) is driven to clamp and fix the receiving barrel; S4: Then, the control panel (53) is used to control the second drive motor (56) to start, and the second drive motor (56) will drive the second rotating shaft (57) and the gear (58) to rotate. The rotation of the gear (58) will drive the two racks (59) to slide in opposite directions in the two first slide grooves (52). At this time, the two racks (59) will slide into the two inclined grooves (65) respectively, and the two lifting seats (64) will move upward under the action of the extrusion force, thereby adjusting the distance between the docking barrel and the discharge pipe (21); S5: After the receiving barrel is placed, the control panel (53) controls the electric valve (22) to start, and the discharge pipe (21) is opened. The methyltetrahydrophthalic anhydride in the storage tank (11) flows out along the discharge pipe (21). At this time, the methyltetrahydrophthalic anhydride first flows along the external threaded drainage disk (26) to the middle part, and then flows through the drainage rod (27) to be drained and flows into the receiving barrel to complete the material collection; S6: The liquid level of methyltetrahydrophthalic anhydride can be observed through the scale bar (12). When the methyltetrahydrophthalic anhydride material in the storage tank (11) is exhausted and needs to be cleaned, clean water can be injected into the storage tank (11) through the feed window (13), and then the clean water in the storage tank (11) can be stirred by the stirring blade (37) to clean the inner wall of the storage tank (11). At this time, the two threaded columns (73) can be installed back into the threaded holes (72). At this time, the second drive motor (56) can be started, and the gear (58) can be controlled by the second drive motor (56) to rotate forward and reverse. When the gear (58) rotates clockwise, the two racks (59) move in opposite directions. At this time, the two lifting seats (64) move upward inside the two rectangular grooves (62), and the two threaded columns (73) will also move upward accordingly. The two threaded columns (73) will extend into the interior of the first scraper (29) and contact the second scraper (31), thereby driving the second scraper (31) and the first scraper (29) to slide on the outer wall of the drainage rod (27) and the inner wall of the discharge pipe (21) respectively, thereby cleaning the outer wall of the drainage rod (27) and the inner wall of the discharge pipe (21). At this time, the first spring (28) will be compressed. When the gear (58) rotates counterclockwise, the two racks (59) move relative to each other. At this time, the two threaded columns (73) will move downward. The first spring (28) will restore its deformation. The two second scrapers (31) and the first scraper (29) will also move downward. When the second scraper (31) and the first scraper (29) move up and down, they can clean the interior of the discharge pipe (21) and remove residual methyltetrahydrophthalic anhydride.

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