Metering device for methyl tetrahydrophthalic anhydride

Abstract

The invention provides a metering device for methyl tetrahydrophthalic anhydride, and relates to the technical field of metering devices.The metering device comprises a metering tank, a feeding pipeline used for feeding is arranged at the upper end of the metering tank, a movable support used for moving and supporting is arranged at the lower end of the metering tank, and two floating balls are arranged in the metering tank; a magnetic suspension type liquid level observation structure is adopted, namely, the floating balls with the magnets are arranged in the metering tank and matched with the U-shaped guide box, the magnetic attraction blocks, the indicating rod and the graduated scale to observe the liquid level, and the liquid level can be observed through the magnetic suspension type liquid level observation structure. Compared with a traditional glass observation mode, the magnetic suspension type liquid level observation structure has many advantages, parts in the magnetic suspension type liquid level observation structure are mostly made of metal or high-strength plastic materials, better stability and durability are achieved, and accurate liquid level data can be continuously provided even if the metering tank is vibrated to a certain degree.

Description

Technical Field

[0001] The invention belongs to the technical field of metering devices, and more specifically, relates to a metering device for methyltetrahydrophthalic anhydride. Background Art

[0002] In numerous research and production fields, such as chemical engineering and materials science, methyltetrahydrophthalic anhydride (MTPA), as an important organic chemical raw material, is widely used in epoxy resin curing agents, polyester resin modifiers, and other applications. Stringent requirements exist for the storage and access of MTPA in related experimental research, product development, and small-batch production. In industrial process control and fluid measurement, liquid level detection technology, as a key branch of flow metering, is widely used in chemical raw material storage and fluid transportation. As a key raw material in epoxy resin curing agents and other fields, precise liquid level monitoring during storage is crucial for material management and production control.

[0003] At present, the methyltetrahydrophthalic anhydride metering tank has been found to have at least the following technical problems:

[0004] 1. The liquid level display structure using transparent glass tubes or glass plates is easily corroded by the corrosiveness of methyltetrahydrophthalic anhydride, resulting in a blurred observation interface, which directly affects the liquid level measurement accuracy. When the material transparency is low, the observation method based on optical principles is difficult to accurately capture the liquid level interface, resulting in measurement errors exceeding industrial standards. Some metering tanks using mechanical float structures have compatibility issues between the float material and methyltetrahydrophthalic anhydride. After long-term use, the float density changes, resulting in buoyancy imbalance. In addition, the existing structure lacks anti-interference design. When the metering tank vibrates or the material flows, the float displacement fluctuation exceeds the measurement error range, which cannot meet the measurement needs of precision chemical scenarios.

[0005] 2. Moreover, the strength of glass decreases after corrosion, and there is a risk of breakage. Once the glass breaks, material leakage will cause serious harm to personnel safety and the experimental environment. In addition, when the material is dark in color or low in transparency, it is difficult to accurately judge the liquid level through the glass, resulting in the operator being unable to grasp the material remaining in time, affecting the normal progress of the experiment or production.

[0006] 3. Regarding quantitative discharging, existing metering tank discharging devices often struggle to achieve precise control. Most rely on simple valve controls, which cannot accurately measure the amount of material discharged each time. For methyltetrahydrophthalic anhydride, a material that is expensive and requires strict dosage control in experiments or production, this crude discharging method can easily lead to material waste and increased costs. Furthermore, frequent discharging operations can easily lead to valve leaks, which not only cause material loss but also potentially pollute the surrounding environment. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides a metering device for methyltetrahydrophthalic anhydride to solve the above problems.

[0008] A metering device for methyltetrahydrophthalic anhydride comprises a metering tank, wherein the upper end of the metering tank is provided with a feed pipe for feeding, the lower end of the metering tank is provided with a movable bracket for movement and support, two floats are provided inside the metering tank, a magnet is provided inside the float close to the inner wall of the metering tank, a connecting rod is connected between the two floats, a U-shaped guide box is fixedly mounted on the circumferential surface of the metering tank, a magnetic block is slidably mounted on the U-shaped guide box, the magnetic block is magnetically connected to the float, a scale is fixedly mounted on the side end of the U-shaped guide box, an indicator rod is fixedly mounted on the magnetic block, a feeding mechanism for quantitatively feeding methyltetrahydrophthalic anhydride is provided at the lower end of the metering tank, a gas storage mechanism for sealing is provided between the upper and lower ends of the metering tank, and an adjustment mechanism for adjusting the float and the connecting rod to enable stirring is provided inside the metering tank.

[0009] Preferably, the unloading mechanism includes a unloading pipe body, a first pipe is fixedly installed on the upper end of the unloading pipe body, the first pipe is fixedly installed on the lower end of the metering tank, and a second pipe is fixedly installed on the lower end of the unloading pipe body. The unloading pipe body, the first pipe and the second pipe are all connected with the interior of the metering tank, and a rotating handle is rotatably installed on the unloading pipe body, and two second gears are provided on the circumferential surface of the rotating handle.

[0010] Preferably, the two second gears are respectively engaged with a first gear transmission belt and a second gear transmission belt, the inner wall of the first gear transmission belt is engaged with a first gear, a first sealing baffle is fixedly mounted on the first gear, and the first sealing baffle is rotatably mounted inside the first pipe, the inner wall of the second gear transmission belt is engaged with a third gear, a second sealing baffle is fixedly mounted on the third gear, and the second sealing baffle is rotatably mounted inside the second pipe.

[0011] Preferably, the gas storage mechanism includes a first air pipe, which is fixedly mounted on the outer wall of the metering tank through a fixed block, a nitrogen pressurizing port being rotatably mounted on the upper end of the first air pipe, a side end of the nitrogen pressurizing port being connected to a second air pipe, the second air pipe being connected to a feed pipe, an I-shaped blocking block being slidably mounted in the feed pipe, the lower end of the first air pipe being fitted with the lower end of the second pipe, the adjusting mechanism includes a rotating shaft, a limiting strip being fixedly mounted on the rotating shaft, the rotating shaft and the limiting strip being both installed on a float, a sliding groove being provided in the rotating shaft, a threaded rod being rotatably mounted in the sliding groove provided on the rotating shaft, an extrusion slider being threadedly connected to the threaded rod, and the extrusion slider being limitedly slidably mounted in the sliding groove provided on the rotating shaft,

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In the present invention, a magnetic levitation liquid level observation structure is adopted, that is, a float with a magnet is set in the metering tank, and the liquid level is observed in combination with a U-shaped guide box, a magnetic block, an indicator rod and a scale. Compared with the traditional glass observation method, it has many advantages. The components in the magnetic levitation liquid level observation structure are mostly made of metal or high-strength plastic, which has better stability and durability. Even if the metering tank is subjected to a certain degree of vibration during movement or experiment, the magnetic levitation liquid level observation system can still operate stably and continuously provide accurate liquid level data.

[0014] In the present invention, a material discharge mechanism includes a material discharge pipe body, a first pipe, a second pipe, a rotating handle, multiple gears, and a sealing baffle. Rotating the rotating handle drives the gear transmission to achieve sequential opening and closing of the first sealing baffle and the second sealing baffle, thereby accurately controlling the discharge amount. This quantitative material discharge method effectively avoids material waste, greatly improves material utilization, and reduces experimental costs for methyltetrahydrophthalic anhydride, which is expensive or scarce in source.

[0015] In the present invention, a gas storage mechanism is formed by a first gas pipe, a nitrogen pressurizing port, a second gas pipe, and an I-shaped blocking block. Nitrogen is charged into the nitrogen pressurizing port, and the nitrogen fills the main space of the feed pipe, the second pipe, and the discharge pipe. The air therein is discharged to form an oxygen-free environment. This can effectively prevent the oxidation of methyltetrahydrophthalic anhydride, avoid the deterioration of the material due to oxidation, maintain the stability of its chemical properties, and ensure the accuracy and reliability of the experimental results.

[0016] In the present invention, an adjustment mechanism including a rotating shaft, a limit bar, a threaded rod and an extrusion slider is used. When methyltetrahydrophthalic anhydride precipitates and delaminates, the magnetic block is removed and the threaded rod is rotated to cause the extrusion slider to push the float and the connecting rod to sink. The material can be stirred by manually rotating the end of the rotating shaft. This design can evenly disperse the additive, ensure that the properties of the material taken each time are consistent, avoid affecting the experimental results due to uneven materials, and improve the credibility of the experimental data.

[0017] In the present invention, the various components such as the unloading mechanism, the gas storage mechanism and the regulating mechanism work together. The sealing baffle of the unloading mechanism effectively prevents material leakage and reduces corrosion to the inside of the equipment; the nitrogen protection of the gas storage mechanism prevents the material from deteriorating and generating impurities that damage the equipment; the regulating mechanism reduces the wear of the tank bottom caused by precipitation when stirring the material. These functions work together to reduce equipment loss, extend the service life of the equipment, and reduce equipment maintenance and replacement costs.

[0018] The metering tank of the present invention is a small tank body, which is suitable for scenarios such as laboratory scientific research experiments, new product development or small-scale trial production where the amount of methyltetrahydrophthalic anhydride used is small and needs to be precisely controlled. Its compact structure and precise functional design meet diverse experimental needs and provide researchers with an efficient and convenient material storage and retrieval solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the metering tank of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the main body of the material discharge pipe of the present invention;

[0022] Figure 4 is a schematic structural diagram of the first trachea of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the rotating shaft of the present invention;

[0024] Figure 6 This invention Figure 3 A magnified schematic diagram of the structure at A;

[0025] Figure 7 This invention Figure 3 A magnified schematic diagram of the structure at B;

[0026] Figure 8 This invention Figure 3 A magnified schematic diagram of the structure at C;

[0027] Figure 9 This invention Figure 5 Enlarged schematic diagram of the structure at D.

[0028] In the figure, the correspondence between the component names and the drawing numbers is: 11. first pipeline; 12. first gear; 13. first gear transmission belt; 14. first sealing baffle; 15. second gear; 16. second gear transmission belt; 17. second pipeline; 18. second sealing baffle; 19. third gear; 21. discharge pipeline body; 22. turning handle; 23. first air pipe; 24. nitrogen pressurization port; 25. I-shaped blocking block; 26. feed pipeline; 27. metering tank; 28. second air pipe; 31. rotating shaft; 32. float; 33. connecting rod; 34. threaded rod; 35. limit strip; 36. sliding groove; 37. extrusion slider; 41. magnetic block; 42. indicator rod; 43. scale; 44. U-shaped guide box; 45. movable bracket. DETAILED DESCRIPTION

[0029] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0030] See also Figures 1-9 The present invention provides a metering device for methyltetrahydrophthalic anhydride, comprising a metering tank 27, wherein the upper end of the metering tank 27 is provided with a feed pipe 26 for feeding, the lower end of the metering tank 27 is provided with a movable bracket 45 for movement and support, and two floats 32 are provided inside the metering tank 27, wherein the floats 32 close to the inner wall of the metering tank 27 are provided with magnets, and the surface material of the two floats 32 is polyethylene. Since the density of polyethylene is generally (0.91-0.96g / cm 3 ), which is less than the density of methyltetrahydrophthalic anhydride, generally (1.2-1.3g / cm 3 ) and the density of magnets is usually (4-7g / cm 3 ), although the density of the magnet is relatively large, the density of polyethylene is relatively small. When the magnet is wrapped with polyethylene, as long as the amount of polyethylene is large enough so that the overall average density after wrapping is less than the density of methyltetrahydrophthalic anhydride, the polyethylene wrapped with the magnet can float in the methyltetrahydrophthalic anhydride. A connecting rod 33 is connected between the two floats 32, and a U-shaped guide box 44 is fixedly installed on the circumferential surface of the metering tank 27. A magnetic block 41 is slidably installed on the inner side of the U-shaped guide box 44, and the magnetic block 41 is magnetically connected to the float 32. A scale 43 is fixedly installed on the side end of the U-shaped guide box 44, and an indicator rod 42 is fixedly installed on the magnetic block 41. The indicator rod 42 is used to align the scale inside the scale 43. When methyltetrahydrophthalic anhydride is added to the metering tank 27, buoyancy will be generated on the two floats 32 and the connecting rod 33. At this time, the two floats 32 will move upward, and the magnetic block 41 magnetically connected to the inside of one of the floats 32 will move upward under the power of the magnetic force, so that the magnetic block 41 can always be at the upper end of the methyltetrahydrophthalic anhydride in the metering tank 27. The methyltetrahydrophthalic anhydride metering tank 27 is a small tank body, which is used for scientific research experiments, new product development or small-scale trial production in the laboratory. When the amount of methyltetrahydrophthalic anhydride is small and its usage and storage conditions need to be precisely controlled, this equipment can be used. The small-capacity metering tank 27 is convenient for taking a small amount of material and can better meet the accuracy and flexibility requirements of the experiment.

[0031] Among them, the lower end of the metering tank 27 is provided with a feeding mechanism for quantitatively feeding methyltetrahydrophthalic anhydride, a gas storage mechanism for sealing is provided between the upper and lower ends of the metering tank 27, and the metering tank 27 is provided with an adjustment mechanism for adjusting the float 32 and the connecting rod 33 so that it can be stirred.

[0032] In this embodiment, Figure 1 、 Figure 3 、 Figure 6 、 Figure 7 、 Figure 8 As shown, the unloading mechanism includes a unloading pipe body 21, a first pipe 11 is fixedly installed on the upper end of the unloading pipe body 21, the first pipe 11 is fixedly installed on the lower end of the metering tank 27, and a second pipe 17 is fixedly installed on the lower end of the unloading pipe body 21. The unloading pipe body 21, the first pipe 11 and the second pipe 17 are all connected with the interior of the metering tank 27. When it is necessary to quantitatively extract methyltetrahydrophthalic anhydride inside the metering tank 27, it can be discharged through the first pipe 11, the unloading pipe body 21 and the second pipe 17 for use.

[0033] In this embodiment, Figure 1 、 Figure 3 、 Figure 6 、 Figure 7 、 Figure 8As shown, a rotating handle 22 is rotatably installed on the discharge pipe body 21, and two second gears 15 are provided on the circumferential surface of the rotating handle 22. The two second gears 15 are respectively engaged with the first gear transmission belt 13 and the second gear transmission belt 16. The inner wall of the first gear transmission belt 13 is engaged with the first gear 12. The first sealing baffle 14 is fixedly installed on the first gear 12. The first sealing baffle 14 is rotatably installed inside the first pipe 11. When the equipment is in a closed state, the first sealing baffle 14 is installed parallel to the inside of the first pipe 11. The first sealing baffle 14 is tightly fitted with the inner wall of the first pipe 11. The inner wall of the second gear transmission belt 16 is engaged with a third gear 19. The second sealing baffle 18 is fixedly installed on the third gear 19. The second sealing baffle 18 is rotatably installed inside the second pipe 17. When the equipment is in a closed state, the second sealing baffle 18 is vertically installed inside the second pipe 17. The rotating handle 22 is a switch handle. When it is necessary to quantitatively extract the methyltetrahydrophthalic anhydride inside the metering tank 27, the rotating handle 22 is rotated to allow the rotating handle 22 to drive the two second gears 15 to rotate, and the first gear transmission belt 13 and the second gear transmission belt 16 synchronously drive the first gear 12 and the third gear 19 to rotate, and then the first gear 12 and the third gear 19 will drive the first sealing baffle 14 and the second sealing baffle 18 to flip. At this time, the first sealing baffle 14 is in an open state and the second sealing baffle 18 is in a closed state. When the first pipeline 11, the discharge pipeline body 21 and the second pipeline 17 are full of methyltetrahydrophthalic anhydride, the rotating handle 22 is quickly rotated in the opposite direction to close the first sealing baffle 14 and then open the second sealing baffle 18 to take out the methyltetrahydrophthalic anhydride from the first pipeline 11, the discharge pipeline body 21 and the second pipeline 17, so as to avoid the methyltetrahydrophthalic anhydride inside the metering tank 27 from being in contact with the outside world for too long during the discharge process.

[0034] In this embodiment, Figure 1 、 Figure 4As shown, the gas storage mechanism includes a first air pipe 23, which is fixedly mounted on the outer wall of a metering tank 27 through a fixing block. A nitrogen pressurizing port 24 is rotatably mounted on the upper end of the first air pipe 23. The side end of the nitrogen pressurizing port 24 is connected to a second air pipe 28. The second air pipe 28 is connected to a feed pipe 26. An I-shaped blocking block 25 is slidably mounted in the feed pipe 26. The lower end of the first air pipe 23 is fitted with the lower end of the second pipe 17, and a sealing gasket is provided between the first air pipe 23 and the second pipe 17. When the metering tank 27 stores methyltetrahydrophthalic anhydride, The lower end of the first air pipe 23 completely overlaps with the discharge port of the second pipe 17, and then the air outlet of the second air pipe 28 is located between the two circular plates in the I-shaped blocking block 25. Nitrogen is flushed into the interior through the nitrogen pressurizing port 24. The nitrogen flows along the second air pipe 28 to fill the space between the I-shaped blocking block 25 and the feed pipe 26. The nitrogen passing through the first air pipe 23 fills the internal space of the second pipe 17 and the discharge pipe body 21. At this time, the nitrogen in these two places can fully seal the gaps between them, and then discharge the air to prevent oxygen from contacting the methyltetrahydrophthalic anhydride inside the metering tank 27.

[0035] In this embodiment, Figure 1 、 Figure 5 、 Figure 9 As shown, the adjustment mechanism includes a rotating shaft 31, on which a limit strip 35 is fixedly installed. The rotating shaft 31 and the limit strip 35 are both installed through the float 32. A sliding groove 36 is provided in the rotating shaft 31, and a threaded rod 34 is rotatably installed in the sliding groove 36 provided in the rotating shaft 31. An extrusion slider 37 is threadedly connected to the threaded rod 34. The extrusion slider 37 is limitedly slidably installed in the sliding groove 36 provided in the rotating shaft 31, and the extrusion slider 37 can squeeze the float 32. When methyltetrahydrophthalic anhydride is stored, precipitation and stratification occur. The device needs to stir the methyltetrahydrophthalic anhydride inside. At this time, the magnetic block 41 is removed from the U-shaped guide box 44 to cancel the magnetic attraction of the end float 32. Then, the threaded rod 34 is rotated. Through the threaded connection between the threaded rod 34 and the extrusion slider 37, the extrusion slider 37 can be controlled to move downward. When the extrusion slider 37 moves downward, the float 32 can be driven downward, so that the float 32 and the connecting rod 33 can be pressed inside the methyltetrahydrophthalic anhydride. Then, the end of the rotating shaft 31 is manually rotated to drive the float 32 and the connecting rod 33 inside the metering tank 27 to rotate, thereby stirring the methyltetrahydrophthalic anhydride, so that the additives in the methyltetrahydrophthalic anhydride are evenly dispersed in the liquid, and precipitation is prevented from accumulating at the bottom of the tank and affecting product quality.

[0036] Working principle:

[0037] The first step is to open the feed pipe 26 and inject methyltetrahydrophthalic anhydride into the metering tank 27 through the feed pipe 26. As the material is injected, the liquid level in the tank rises, generating buoyancy on the two floats 32 and the connecting rod 33, causing the float 32 to move upward. The float 32, which is close to the inner wall of the metering tank 27 and contains a magnet inside, will drive the magnetic block 41 in the U-shaped guide box 44 to move upward synchronously through magnetic force, and the indicator rod 42 on the magnetic block 41 will move accordingly. The indicator rod 42 is always aligned with the scale on the scale 43. The operator can intuitively understand the liquid level height in the tank by observing the position of the indicator rod 42 on the scale 43.

[0038] In the second step, when storing methyltetrahydrophthalic anhydride, the metering tank 27 needs to be sealed. First, the lower end of the first air pipe 23 is aligned with the discharge port of the second pipe 17 and tightly fitted to ensure that the connection is well sealed. Nitrogen is then filled into the first air pipe 23 through the nitrogen pressurizing port 24. The nitrogen enters the feed pipe 26 through the second air pipe 28 and fills the space between the I-shaped blocking block 25 and the feed pipe 26. At the same time, the nitrogen entering the first air pipe 23 fills the internal space of the second pipe 17 and the discharge pipe body 21, and the air in these parts is discharged, effectively preventing oxygen from contacting the methyltetrahydrophthalic anhydride in the tank and preventing it from oxidizing and deteriorating.

[0039] In the third step, when a certain amount of methyltetrahydrophthalic anhydride needs to be taken out from the metering tank 27, the rotating handle 22 on the discharge pipe body 21 is first rotated, and the two second gears 15 on the circumferential surface of the rotating handle 22 rotate accordingly, thereby driving the first gear transmission belt 13 and the second gear transmission belt 16 to move. The first gear transmission belt 13 drives the first gear 12 to rotate, so that the first sealing baffle 14 fixed on the first gear 12 is flipped open in the first pipe 11; at the same time, the second gear transmission belt 16 drives the third gear 19 to rotate, so that the second sealing baffle 18 The second pipe 17 remains closed. At this time, methyltetrahydrophthalic anhydride flows from the metering tank 27 through the first pipe 11 into the discharge pipe body 21 under the action of gravity. When the first pipe 11, the discharge pipe body 21 and the second pipe 17 are filled with methyltetrahydrophthalic anhydride, the handle 22 is quickly rotated in the opposite direction to close the first sealing baffle 14, preventing the remaining material in the tank from continuing to flow out. Then the second sealing baffle 18 is opened to take out the methyltetrahydrophthalic anhydride in the pipe filled with material for use, thereby achieving quantitative discharge and reducing the contact time of the material with the outside world.

[0040] The fourth step is that if the methyltetrahydrophthalic anhydride precipitates and stratifies during storage, it needs to be stirred. First, the magnetic block 41 in the U-shaped guide box 44 is removed to release the magnetic attraction between it and the end float 32. Then, the threaded rod 34 in the rotating shaft 31 is rotated. Since the threaded rod 34 is threadedly connected to the extrusion slider 37, the rotation of the threaded rod 34 will cause the extrusion slider 37 to move downward in the sliding groove 36 of the rotating shaft 31. During the downward movement of the extrusion slider 37, the float 32 is squeezed, driving the float 32 and the connecting rod 33 to sink into the methyltetrahydrophthalic anhydride. Then, the end of the rotating shaft 31 is manually rotated, and the rotating shaft 31 drives the float 32 and the connecting rod 33 to rotate in the tank, stirring the methyltetrahydrophthalic anhydride, so that the additives therein are evenly dispersed, and preventing precipitation from accumulating at the bottom of the tank and affecting product quality.

[0041] In the fifth step, when the measuring tank 27 needs to be moved, the measuring tank 27 can be moved by the movable bracket 45. The movable bracket 45 provides movement and support functions for the measuring tank 27, making it convenient to adjust the position of the measuring tank 27 according to actual needs in places such as laboratories.

[0042] Step 6. After use, the equipment can be cleaned, inspected and other maintenance operations can be carried out according to actual conditions. Check whether each component is normal, such as whether the sealing components are well sealed, whether the gear transmission components are flexible, etc., to ensure that the equipment can work normally the next time it is used. When it is used again in the future, repeat the above-mentioned feeding, sealing, unloading, stirring and other operation processes.

[0043] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled 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 skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. A metering device for methyltetrahydrophthalic anhydride, comprising a metering tank (27), characterized in that: The upper end of the metering tank (27) is provided with a feeding pipe (26) for feeding, the lower end of the metering tank (27) is provided with a movable bracket (45) for movement and support, two floating balls (32) are provided inside the metering tank (27), a magnet is provided inside the floating balls (32) close to the inner wall of the metering tank (27), a connecting rod (33) is connected between the two floating balls (32), a U-shaped guide box (44) is fixedly installed on the circumferential surface of the metering tank (27), a magnetic block (41) is slidably installed on the U-shaped guide box (44), the magnetic block (41) is magnetically connected to the floating ball (32), a scale (43) is fixedly installed on the side end of the U-shaped guide box (44), and an indicator rod (42) is fixedly installed on the magnetic block (41); The lower end of the metering tank (27) is provided with a feeding mechanism for quantitatively feeding methyltetrahydrophthalic anhydride, a gas storage mechanism for sealing is provided between the upper and lower ends of the metering tank (27), and an adjusting mechanism for adjusting a float (32) and a connecting rod (33) to enable stirring is provided inside the metering tank (27).

2. A metering device for methyltetrahydrophthalic anhydride as claimed in claim 1, characterized in that: The material discharge mechanism comprises a material discharge pipe body (21), the upper end of which is fixedly mounted a first pipe (11), and the first pipe (11) is fixedly mounted on the lower end of a metering tank (27).

3. A metering device for methyltetrahydrophthalic anhydride as claimed in claim 2, characterized in that: A second pipe (17) is fixedly installed at the lower end of the discharge pipe body (21), and the discharge pipe body (21), the first pipe (11) and the second pipe (17) are all connected to the interior of the metering tank (27).

4. A metering device for methyltetrahydrophthalic anhydride as claimed in claim 3, characterized in that: A rotating handle (22) is rotatably installed on the discharge pipe body (21), and two second gears (15) are provided on the circumferential surface of the rotating handle (22). The two second gears (15) are respectively engaged with a first gear transmission belt (13) and a second gear transmission belt (16).

5. A metering device for methyltetrahydrophthalic anhydride as claimed in claim 4, characterized in that: The inner wall of the first gear transmission belt (13) is meshed with a first gear (12), a first sealing baffle (14) is fixedly mounted on the first gear (12), and the first sealing baffle (14) is rotatably mounted inside the first pipe (11).

6. A metering device for methyltetrahydrophthalic anhydride as claimed in claim 5, characterized in that: The inner wall of the second gear transmission belt (16) is meshed with a third gear (19), a second sealing baffle (18) is fixedly mounted on the third gear (19), and the second sealing baffle (18) is rotatably mounted inside the second pipe (17).

7. A metering device for methyltetrahydrophthalic anhydride as claimed in claim 6, characterized in that: The gas storage mechanism comprises a first gas pipe (23), which is fixedly mounted on the outer wall of the metering tank (27) via a fixing block, and a nitrogen pressurizing port (24) is rotatably mounted on the upper end of the first gas pipe (23).

8. A metering device for methyltetrahydrophthalic anhydride as claimed in claim 7, characterized in that: The side end of the nitrogen pressurizing port (24) is connected to a second air pipe (28), the second air pipe (28) is connected to a feed pipe (26), an I-shaped blocking block (25) is slidably installed in the feed pipe (26), and the lower end of the first air pipe (23) is fitted with the lower end of the second pipe (17).

9. A metering device for methyltetrahydrophthalic anhydride according to claim 8, characterized in that: The regulating mechanism comprises a rotating shaft (31), a limiting strip (35) is fixedly mounted on the rotating shaft (31), the rotating shaft (31) and the limiting strip (35) are both installed through the floating ball (32), and a sliding groove (36) is provided in the rotating shaft (31).

10. A metering device for methyltetrahydrophthalic anhydride according to claim 9, characterized in that: A threaded rod (34) is rotatably mounted in the sliding groove (36) provided on the rotating shaft (31), an extrusion slider (37) is threadedly connected to the threaded rod (34), and the extrusion slider (37) is limitedly slidably mounted in the sliding groove (36) provided on the rotating shaft (31).

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