Feeding device and process for preparing modified methyl tetrahydrophthalic anhydride

Abstract

The invention provides a modified methyl tetrahydrophthalic anhydride preparation feeding device and process, and relates to the technical field of feeding valves, the modified methyl tetrahydrophthalic anhydride preparation feeding device comprises an electric control liquid valve, a liquid outlet end connecting flange is arranged on the side wall of the electric control liquid valve, a stable conveying structure is installed on the side wall of the liquid outlet end connecting flange in a threaded mode, and the stable conveying structure comprises a flange plate; a first pipeline is fixedly installed on the side wall of the flange plate, a second pipeline is fixedly installed on the side wall of the first pipeline, a storage groove is formed in the second pipeline in a penetrating mode, and a motor is fixedly installed on the inner wall of the storage groove in an embedded mode. Further, the first discharging pipeline is driven to integrally move in the second pipeline, so that the flowing path lengths of the first discharging pipeline, the second discharging pipeline and the conical discharging pipe can be adjusted according to the flowing state of methyl tetrahydrophthalic anhydride on the inner wall of a tank body of the preparation equipment; therefore, the possibility of splashing caused by large flow power of the methyl tetrahydrophthalic anhydride is reduced, and the safety is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of feed valves, and more specifically, particularly relates to a feed device and process for preparing modified methyltetrahydrophthalic anhydride. Background Art

[0002] Methyltetrahydrophthalic anhydride is usually a light yellow transparent liquid with a low viscosity, which allows it to flow and disperse relatively easily when mixed with other substances. Modified methyltetrahydrophthalic anhydride is a chemically modified organic compound. It is a product obtained by introducing other functional groups or changing its molecular structure through chemical reactions on the basis of methyltetrahydrophthalic anhydride. Methyltetrahydrophthalic anhydride is an acid anhydride compound. In the process of preparing methyltetrahydrophthalic anhydride into modified methyltetrahydrophthalic anhydride, a feeding device is usually required for conveying methyltetrahydrophthalic anhydride.

[0003] 1. When transporting methyltetrahydrophthalic anhydride, the existing device usually directly pours the methyltetrahydrophthalic anhydride into the equipment used for preparation. However, during the pouring process, the methyltetrahydrophthalic anhydride is prone to splashing. Since methyltetrahydrophthalic anhydride is corrosive to a certain extent, chemical accidents are prone to occur, and the safety is insufficient;

[0004] 2. When transporting methyltetrahydrophthalic anhydride, the existing device usually directly pours the methyltetrahydrophthalic anhydride into the device for preparation, and lacks guidance when discharging the methyltetrahydrophthalic anhydride, so that the methyltetrahydrophthalic anhydride is easily splashed into the gap of the tank cover of the tank body of the required preparation equipment, thereby causing the methyltetrahydrophthalic anhydride to be transported through the valve after proportioning inaccurately;

[0005] 3. When the existing device is used to transport methyltetrahydrophthalic anhydride, the valve usually only has the functions of opening and closing the valve and adjusting the flow rate. It is unable to avoid the problem of liquid splashing according to the transport characteristics of some liquids, and the functionality is insufficient. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a modified methyltetrahydrophthalic anhydride preparation feeding device and process to solve the above problems.

[0007] A modified methyltetrahydrophthalic anhydride preparation feeding device comprises an electrically controlled liquid valve, a liquid inlet connection flange is arranged on the side wall of the electrically controlled liquid valve, and a liquid outlet connection flange is arranged on the side wall of the electrically controlled liquid valve away from the liquid inlet connection flange;

[0008] A stable conveying structure is threadedly mounted on the side wall of the liquid outlet connection flange;

[0009] The stable conveying structure includes a flange, a first pipe is fixedly installed on the side wall of the flange, an anti-corrosion shrinkable corrugated hose is fixedly installed on the inner wall of the flange, a second pipe is fixedly installed on the side wall of the first pipe, and the inner wall of the second pipe is symmetrically provided with slide grooves, two slide grooves are slidably installed with sliders, a first discharge pipe is fixedly installed between the two sliders, the anti-corrosion shrinkable corrugated hose is fixedly installed with the first discharge pipe, the first discharge pipe is L-shaped as a whole, the first discharge pipe is partially exposed to the outside of the second pipe, the first discharge pipe is slidably installed with the inner wall of the second pipe, a storage groove is opened through the inside of the second pipe, the storage groove is located above the slide groove, and a motor is embedded and fixedly installed on the inner wall of the storage groove.

[0010] Preferably, the output shaft of the motor is rotatably mounted with the second pipe, a screw is fixedly mounted on the output shaft of the motor, the screw is located inside the storage slot, the screw is rotatably mounted with the storage slot, a transmission block is fixedly mounted on the upper end of the first discharge pipe, the transmission block is located inside the storage slot, the transmission block is slidably mounted with the storage slot, the screw is threadedly mounted with the transmission block, and limiting grooves are symmetrically provided inside the storage slot.

[0011] Preferably, limit blocks are slidably installed inside the two limit grooves, the two limit blocks are located on both sides of the transmission block, the two limit blocks are fixedly installed to the transmission block, the second discharge pipe is rotatably installed on the side wall of the first discharge pipe, and a fixed sleeve is fixedly installed on the circumferential surface of the first discharge pipe.

[0012] Preferably, a rotating ring is fixedly installed on the circumferential surface of the second discharge pipe, and the rotating ring and the fixed sleeve are rotatably installed through a damping bearing. A conical discharge pipe is fixedly installed on the side wall of the second discharge pipe, and the conical discharge pipe is wide at the front and narrow at the back. An inclined groove is provided at the end of the conical discharge pipe, and an arc groove is opened on the side wall of the inclined groove. A control unit is provided at the upper end of the electric liquid valve.

[0013] A process for using a modified methyltetrahydrophthalic anhydride preparation feeding device comprises the following steps:

[0014] S1: When in use, the staff can first adjust the working state of the stable conveying structure according to the preparation equipment installed by the stable conveying structure. The staff can first turn on the motor to rotate the output shaft of the motor, thereby driving the screw connected to the motor to rotate inside the storage slot. At the same time, the screw will rotate to cause the screw and the transmission block to have threaded transmission, so that the transmission block slides inside the storage slot. At the same time, the movement of the transmission block will drive the limit block to slide synchronously inside the limit slot, and the movement of the transmission block will also drive the first discharge pipe to move together, so that the first discharge pipe drives the slider to slide inside the second pipe and the slide slot respectively, so that the first discharge pipe, the second discharge pipe and the tapered discharge pipe move together in the direction away from the liquid inlet end connection flange or in the direction close to the liquid inlet end connection flange, so that the tapered discharge pipe and the inner wall of the tank of the preparation equipment installed by the feeding device maintain a suitable distance, and at the same time, the movement of the first discharge pipe will pull the corrosion-resistant shrinkable corrugated hose to stretch or shrink adaptively;

[0015] S2: After the staff has kept a suitable distance between the conical discharge pipe and the inner wall of the tank of the preparation equipment where the feeding device is installed, the staff can rotate the second discharge pipe on the first discharge pipe, so that the rotating ring on the second discharge pipe rotates on the fixed sleeve. At the same time, since the rotating ring and the fixed sleeve are installed through the damping bearing, when the staff adjusts the angle of the second discharge pipe, the damping bearing between the rotating ring and the fixed sleeve can be used to keep the second discharge pipe and the conical discharge pipe at any state of the current angle. Then the staff can start the motor again to make the output of the motor The shaft drives the screw rod to rotate and again transmits threaded transmission with the transmission block, so that the transmission block again drives the storage tank and the first discharge pipe to move in the storage tank and the second pipe in the direction close to the side of the connecting flange of the liquid inlet end. At the same time, the movement of the first discharge pipe will drive the second discharge pipe and the tapered discharge pipe to approach the inner wall of the tank of the preparation equipment installed with the feeding device. When the end of the tapered discharge pipe fits with the inner wall of the tank of the preparation equipment, the staff can close the transmission block. At this time, an arc groove for liquid circulation will be left between the tapered discharge pipe and the inner wall of the tank of the preparation equipment.

[0016] S3: The staff can then prepare a liquid with the same properties as methyltetrahydrophthalic anhydride for debugging. The staff can transport the liquid into the electric-controlled liquid valve through the liquid inlet connecting flange. At the same time, the liquid will enter the electric-controlled liquid valve through the liquid inlet connecting flange and be discharged from the liquid outlet connecting flange. At this time, the liquid will enter the first discharge pipe through the corrosion-resistant shrinkable corrugated hose and be discharged from the second discharge pipe from the inside of the tapered discharge pipe, so that the liquid can enter the arc groove naturally left between the inner walls of the tank body of the preparation equipment and flow down along the inner wall of the tank body of the preparation equipment. The staff can then observe whether the liquid has splashing or unstable flow, and adjust the distance of the first discharge pipe extending or retracting the liquid inlet connecting flange according to the phenomenon, as well as adjust the inclination angle of the second discharge pipe and the tapered discharge pipe until it is ensured that the liquid can flow in a stable manner on the inner wall of the tank body of the preparation equipment.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the present invention, by arranging an anti-corrosion shrinkable corrugated hose between the liquid inlet end connecting flange and the first discharge pipe, the liquid transported by the liquid inlet end connecting flange can be ensured to flow through the first discharge pipe, the second discharge pipe and the tapered discharge pipe when the first discharge pipe, the second discharge pipe and the tapered discharge pipe can be moved, thereby avoiding leakage and improving reliability.

[0019] In the present invention, by turning on the motor, the screw rod rotates and the transmission block is threadedly transmitted, and the transmission block drives the first discharge pipe to move as a whole inside the second pipe, so that the flow path lengths of the first discharge pipe, the second discharge pipe and the tapered discharge pipe can be adjusted according to the flow state of methyltetrahydrophthalic anhydride on the inner wall of the tank of the preparation equipment, thereby reducing the possibility of splashing due to the large flow force of methyltetrahydrophthalic anhydride, more effectively avoiding liquid splashing, thereby improving safety, and eliminating potential accidents such as material leakage and injury to operators caused by splashing;

[0020] In the present invention, the screw drive between the lead screw and the drive block is realized by turning on the motor, so as to drive the first discharge pipe to move inside the second pipe, and then the flow path lengths of the first discharge pipe, the second discharge pipe and the tapered discharge pipe when conveying liquid can be adjusted according to actual conditions, and corresponding adjustments can be made according to the actual flow state of methyltetrahydrophthalic anhydride on the inner wall of the tank body, so that it can better adapt to different tank shapes and sizes, ensure that methyltetrahydrophthalic anhydride can be reasonably and smoothly conveyed in various storage or reaction container environments, and improve the adaptability and versatility of the entire device in different application scenarios;

[0021] In the present invention, by arranging a fixing sleeve on the first discharge pipe, arranging a rotating ring on the second discharge pipe, and connecting the first discharge pipe with the second discharge pipe using a damping bearing, the staff can further adjust the inclination angle of the second discharge pipe and the tapered discharge pipe, so that the liquid contacts the container wall at a more appropriate angle, so as to flow down more smoothly along the container wall, further reducing the possibility of liquid splashing and further improving safety;

[0022] In the present invention, by setting the slide groove and the limit groove, when adjusting the movement of the first discharge pipe, the staff can first drive the limit block to slide synchronously in the limit groove through the transmission block. At the same time, the movement of the transmission block will drive the slider to slide in the second pipe and the slide groove respectively through the first discharge pipe, thereby providing multiple limits, greatly improving the stability of the first discharge pipe, the second discharge pipe and the tapered discharge pipe when moving, and after the adjustment is completed, and improving reliability;

[0023] In the present invention, by arranging a conical discharge pipe, liquid is transported by utilizing an arc groove naturally formed after the conical discharge pipe contacts the tank body of the preparation equipment, which can not only avoid chemical accidents caused by liquid splashing, but also avoid the problem that the content of methyltetrahydrophthalic anhydride actually prepared does not conform to the required content of methyltetrahydrophthalic anhydride due to splashing of methyltetrahydrophthalic anhydride onto the tank cover of the preparation equipment tank body, thereby improving the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the three-dimensional connection explosion structure of the present invention;

[0026] Figure 3 is a cross-sectional view of a first pipeline of the present invention;

[0027] Figure 4 It is a schematic diagram of the explosion structure of the electric-controlled liquid valve connection of the present invention;

[0028] Figure 5 is a second pipeline cross-sectional view of the present invention;

[0029] Figure 6 It is a schematic diagram of the second pipeline connection explosion structure of the present invention;

[0030] Figure 7 It is a schematic diagram of the motor connection explosion structure of the present invention;

[0031] Figure 8 The present invention Figure 7 A magnified view of the structure at A;

[0032] Fig. 9It is a schematic diagram of the explosion structure of the first discharge pipe connection of the present invention;

[0033] Fig.10 The present invention Fig. 9 Enlarged view of the structure at point B in the figure.

[0034] In the figure, the correspondence between the component names and the figure numbers is: 11, electric-controlled liquid valve; 12, liquid inlet connecting flange; 13, liquid outlet connecting flange; 14, flange; 15, first pipeline; 16, corrosion-resistant shrinkable corrugated hose; 17, second pipeline; 18, slide; 19, slider; 21, first discharge pipeline; 22, storage slot; 23, motor; 24, screw; 25, transmission block; 26, limit groove; 27, limit block; 28, second discharge pipeline; 29, fixed sleeve; 31, rotating ring; 32, tapered discharge pipe; 33, inclined groove; 34, arc groove; 35, control unit. DETAILED DESCRIPTION

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

[0036] See also Figure 1 - Fig.10 The present invention provides a modified methyltetrahydrophthalic anhydride preparation feeding device, comprising an electrically controlled liquid valve 11, a liquid inlet end connecting flange 12 is provided on the side wall of the electrically controlled liquid valve 11, and a liquid outlet end connecting flange 13 is provided on the side wall of the electrically controlled liquid valve 11 away from the liquid inlet end connecting flange 12;

[0037] A stable conveying structure is threadedly mounted on the side wall of the liquid outlet connection flange 13;

[0038] The stable conveying structure includes a flange 14, a first pipe 15 is fixedly installed on the side wall of the flange 14, an anti-corrosion shrinkable corrugated hose 16 is fixedly installed on the inner wall of the flange 14, a second pipe 17 is fixedly installed on the side wall of the first pipe 15, and a slide groove 18 is symmetrically opened on the inner wall of the second pipe 17, and sliders 19 are slidably installed inside the two slide grooves 18, and a first discharge pipe 21 is fixedly installed between the two sliders 19, and the anti-corrosion shrinkable corrugated hose 16 is fixedly installed with the first discharge pipe 21. By arranging the anti-corrosion shrinkable corrugated hose 16 between the liquid inlet end connecting flange 12 and the first discharge pipe 21, it is possible to ensure that the liquid transported by the liquid inlet end connecting flange 12 can flow through the first discharge pipe 21, the second discharge pipe 28 and the tapered discharge pipe 32 when the first discharge pipe 21, the second discharge pipe 28 and the tapered discharge pipe 32 can be moved, thereby avoiding leakage and improving reliability.

[0039] The first discharge pipe 21 is L-shaped as a whole. The first discharge pipe 21 is partially exposed outside the second pipe 17. The first discharge pipe 21 is slidably installed with the inner wall of the second pipe 17. A storage groove 22 is opened inside the second pipe 17. The storage groove 22 is located above the slide groove 18. A motor 23 is embedded and fixedly installed on the inner wall of the storage groove 22. The output shaft of the motor 23 is rotatably installed with the second pipe 17. A screw rod 24 is fixedly installed on the output shaft of the motor 23. By turning on the motor 23, the screw rod 24 rotates and transmits threaded transmission with the transmission block 25. The transmission block 25 drives the first discharge pipe 21 to move inside the second pipe 17 as a whole, and then the flow path lengths of the first discharge pipe 21, the second discharge pipe 28 and the tapered discharge pipe 32 can be adjusted according to the flow state of methyltetrahydrophthalic anhydride on the inner wall of the tank of the preparation equipment, so as to reduce the possibility of splashing due to the large flow force of methyltetrahydrophthalic anhydride, more effectively avoid liquid splashing, thereby improving safety, and eliminating potential accidents such as material leakage and injury to operators caused by splashing.

[0040] The screw rod 24 is located inside the storage groove 22, and the screw rod 24 is rotatably installed with the storage groove 22. A transmission block 25 is fixedly installed on the upper end of the first discharge pipe 21, and the transmission block 25 is located inside the storage groove 22. The transmission block 25 is slidably installed with the storage groove 22, and the screw rod 24 and the transmission block 25 are threadedly installed. By turning on the motor 23, the threaded transmission of the screw rod 24 and the transmission block 25 is realized, and the first discharge pipe 21 is driven to move inside the second pipe 17, and then the flow path lengths of the first discharge pipe 21, the second discharge pipe 28 and the tapered discharge pipe 32 when conveying liquid can be adjusted according to actual conditions, and corresponding adjustments can be made according to the actual flow state of methyltetrahydrophthalic anhydride on the inner wall of the tank body, so that it can better adapt to different tank shapes and sizes, ensure that methyltetrahydrophthalic anhydride can be reasonably and smoothly conveyed in various storage or reaction container environments, and improve the adaptability and versatility of the entire device in different application scenarios.

[0041] Limiting grooves 26 are symmetrically provided inside the storage groove 22, and limiting blocks 27 are slidably installed inside the two limiting grooves 26. The two limiting blocks 27 are located on both sides of the transmission block 25, and the two limiting blocks 27 are fixedly installed with the transmission block 25. By setting the slide groove 18 and the limiting groove 26, when the staff adjusts the movement of the first discharge pipe 21, they can first drive the limiting blocks 27 to slide synchronously in the limiting groove 26 through the transmission block 25. At the same time, the movement of the transmission block 25 will drive the slider 19 to slide in the second pipe 17 and the slide groove 18 respectively through the first discharge pipe 21, thereby providing multi-party limiting, greatly improving the stability of the first discharge pipe 21, the second discharge pipe 28 and the tapered discharge pipe 32 during movement, and after the adjustment is completed, thereby improving reliability.

[0042] A second discharge pipe 28 is rotatably mounted on the side wall of the first discharge pipe 21, a fixed sleeve 29 is fixedly mounted on the circumferential surface of the first discharge pipe 21, and a rotating ring 31 is fixedly mounted on the circumferential surface of the second discharge pipe 28. The rotating ring 31 and the fixed sleeve 29 are rotatably mounted via a damping bearing (a damping bearing is a special bearing that can provide arbitrarily strong motion resistance, which is convenient for an object connected to the damping bearing to stay at any angle. At the same time, the damping force generated by the damping bearing can be adjusted by adjusting the damping material in the damping bearing). By providing a fixed sleeve 29 on the first discharge pipe 21, providing a rotating ring 31 on the second discharge pipe 28, and using a damping bearing to connect the first discharge pipe 21 and the second discharge pipe 28, the staff can further adjust the inclination angle of the second discharge pipe 28 and the tapered discharge pipe 32, so that the liquid contacts the container wall at a more suitable angle and flows down more smoothly along the container wall, further reducing the possibility of liquid splashing and further improving safety.

[0043] A conical discharge pipe 32 is fixedly mounted on the side wall of the second discharge pipe 28. The conical discharge pipe 32 is wide at the front and narrow at the back. An inclined groove 33 is arranged at the end of the conical discharge pipe 32. An arc groove 34 is arranged on the side wall of the inclined groove 33. A control unit 35 is arranged at the upper end of the electric-controlled liquid valve 11 (the control unit 35 is used to control the valve start of the electric-controlled liquid valve 11 and the opening of the motor 23). By setting the conical discharge pipe 32, the liquid is transported by utilizing the arc groove 34 naturally formed after the conical discharge pipe 32 contacts the tank body of the preparation equipment. This can not only avoid chemical accidents caused by liquid splashing, but also avoid the problem that the actual prepared methyltetrahydrophthalic anhydride does not meet the required methyltetrahydrophthalic anhydride preparation content due to methyltetrahydrophthalic anhydride splashing onto the tank cover of the preparation equipment tank body, thereby improving the processing quality.

[0044] Working principle:

[0045] The first step is that when in use, the staff can first adjust the working state of the stable conveying structure according to the preparation equipment installed by the stable conveying structure. The staff can first turn on the motor 23 to rotate the output shaft of the motor 23, thereby driving the screw rod 24 connected to the motor 23 to rotate inside the storage groove 22. At the same time, the rotation of the screw rod 24 will cause the screw rod 24 and the transmission block 25 to have threaded transmission, so that the transmission block 25 slides inside the storage groove 22. At the same time, the movement of the transmission block 25 will drive the limit block 27 to slide synchronously inside the limit groove 26, and the movement of the transmission block 25 will also drive The first discharge pipe 21 moves together, so that the first discharge pipe 21 drives the slider 19 to slide inside the second pipe 17 and the chute 18 respectively, so that the first discharge pipe 21, the second discharge pipe 28 and the tapered discharge pipe 32 move together in a direction away from the liquid inlet end connection flange 12 or in a direction close to the liquid inlet end connection flange 12, so that the tapered discharge pipe 32 maintains a suitable distance from the inner wall of the tank of the preparation equipment where the feeding device is installed. At the same time, the movement of the first discharge pipe 21 will pull the corrosion-resistant shrinkable corrugated hose 16 to stretch or shrink appropriately;

[0046] In the second step, after the staff has kept a suitable distance between the conical discharge pipe 32 and the inner wall of the tank of the preparation equipment on which the feeding device is installed, the staff can rotate the second discharge pipe 28 on the first discharge pipe 21, so that the rotating ring 31 on the second discharge pipe 28 rotates on the fixed sleeve 29. At the same time, since the rotating ring 31 and the fixed sleeve 29 are installed through a damping bearing, when the staff adjusts the angle of the second discharge pipe 28, the damping bearing between the rotating ring 31 and the fixed sleeve 29 can be used to keep the second discharge pipe 28 and the conical discharge pipe 32 in any state of the current angle. Then the staff can start the motor 23 again, so that the output of the motor 23 is The shaft drives the screw rod 24 to rotate and again transmits threaded transmission with the transmission block 25, so that the transmission block 25 again drives the storage tank 22 and the first discharge pipe 21 to move in the storage tank 22 and the second pipe 17 toward the side of the liquid inlet end connection flange 12. At the same time, the movement of the first discharge pipe 21 will drive the second discharge pipe 28 and the tapered discharge pipe 32 to approach the inner wall of the tank of the preparation equipment installed by the feeding device. When the end of the tapered discharge pipe 32 fits with the inner wall of the tank of the preparation equipment, the staff can close the transmission block 25. At this time, an arc groove 34 for liquid circulation will be left between the tapered discharge pipe 32 and the inner wall of the tank of the preparation equipment.

[0047] In the third step, the staff can then prepare a liquid with the same properties as methyltetrahydrophthalic anhydride for debugging. The staff can transport the liquid into the electric-controlled liquid valve 11 through the liquid inlet connecting flange 12. At the same time, the liquid will enter the electric-controlled liquid valve 11 through the liquid inlet connecting flange 12 and be discharged from the liquid outlet connecting flange 13. At this time, the liquid will enter the first discharge pipe 21 through the corrosion-resistant shrinkable corrugated hose 16 and be discharged from the second discharge pipe 28 from the tapered discharge pipe 32, so that the liquid can enter the arc groove 34 naturally left between the inner walls of the tank body of the preparation equipment and flow down along the inner wall of the tank body of the preparation equipment. Then the staff can observe whether the liquid splashes or has unstable flow, and adjust the distance of the first discharge pipe 21 extending or retracting the liquid inlet connecting flange 12 according to the phenomenon, and adjust the inclination angle of the second discharge pipe 28 and the tapered discharge pipe 32 until it is ensured that the liquid can flow in a stable manner on the inner wall of the tank body of the preparation equipment.

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

Claims

1. A modified methyltetrahydrophthalic anhydride preparation feeding device, comprising an electrically controlled liquid valve (11), a liquid inlet end connecting flange (12) being provided on a side wall of the electrically controlled liquid valve (11), and a liquid outlet end connecting flange (13) being provided on a side wall of the electrically controlled liquid valve (11) away from the liquid inlet end connecting flange (12). It is characterized by: A stable conveying structure is threadedly mounted on the side wall of the liquid outlet connection flange (13); The stable conveying structure comprises a flange (14), a first pipe (15) is fixedly mounted on the side wall of the flange (14), an anti-corrosion shrinkable corrugated hose (16) is fixedly mounted on the inner wall of the flange (14), a second pipe (17) is fixedly mounted on the side wall of the first pipe (15), a slide groove (18) is symmetrically provided on the inner wall of the second pipe (17), two slide grooves (18) are slidably mounted inside each of the two slide grooves (18), a first discharge pipe (21) is fixedly mounted between the two slide grooves (19), the anti-corrosion shrinkable corrugated hose (16) is fixedly mounted on the first discharge pipe (21), and the first discharge pipe (21) is slidably mounted on the inner wall of the second pipe (17).

2. A feeding device for preparing modified methyltetrahydrophthalic anhydride as claimed in claim 1, characterized in that: A storage groove (22) is provided inside the second pipe (17), the storage groove (22) is located above the slide groove (18), and a motor (23) is embedded and fixedly installed on the inner wall of the storage groove (22).

3. A feeding device for preparing modified methyltetrahydrophthalic anhydride as claimed in claim 2, characterized in that: The output shaft of the motor (23) is rotatably mounted on the second pipe (17), a screw rod (24) is fixedly mounted on the output shaft of the motor (23), and the screw rod (24) is rotatably mounted on the storage groove (22).

4. A feeding device for preparing modified methyltetrahydrophthalic anhydride as claimed in claim 3, characterized in that: A transmission block (25) is fixedly mounted on the upper end of the first discharge pipe (21); the transmission block (25) is located inside the storage groove (22); the transmission block (25) and the storage groove (22) are slidably mounted; the screw rod (24) and the transmission block (25) are threadedly mounted; and limiting grooves (26) are symmetrically provided inside the storage groove (22).

5. A feeding device for preparing modified methyltetrahydrophthalic anhydride as claimed in claim 4, characterized in that: The two limiting grooves (26) are both slidably mounted with limiting blocks (27), and the two limiting blocks (27) are both fixedly mounted to the transmission block (25).

6. A feeding device for preparing modified methyltetrahydrophthalic anhydride as claimed in claim 5, characterized in that: A second discharge pipe (28) is rotatably mounted on the side wall of the first discharge pipe (21), and a fixing sleeve (29) is fixedly mounted on the circumferential surface of the first discharge pipe (21).

7. A feeding device for preparing modified methyltetrahydrophthalic anhydride as claimed in claim 6, characterized in that: A rotating ring (31) is fixedly mounted on the circumferential surface of the second discharge pipe (28); the rotating ring (31) and the fixed sleeve (29) are rotatably mounted via a damping bearing; and a conical discharge pipe (32) is fixedly mounted on the side wall of the second discharge pipe (28).

8. A feeding device for preparing modified methyltetrahydrophthalic anhydride as claimed in claim 7, characterized in that: The conical discharge pipe (32) is wide at the front and narrow at the rear, and an inclined groove (33) is provided at the end of the conical discharge pipe (32).

9. A feeding device for preparing modified methyltetrahydrophthalic anhydride as claimed in claim 8, characterized in that: An arc-shaped groove (34) is provided on the side wall of the inclined groove (33), and a control unit (35) is provided at the upper end of the electrically controlled liquid valve (11).

10. A process for using a feed device for preparing modified methyltetrahydrophthalic anhydride, characterized in that: The steps include: S1: When in use, the staff can first adjust the working state of the stable conveying structure according to the preparation equipment installed with the stable conveying structure. The staff can first turn on the motor (23) to rotate the output shaft of the motor (23) and generate threaded transmission with the transmission block (25), so that the transmission block (25) slides inside the storage groove (22). At the same time, the movement of the transmission block (25) will drive the first discharge pipe (21) to move together, so that the first discharge pipe (21) drives the slider (19) in the second pipe (17) respectively. and slide inside the chute (18), so that the first discharge pipe (21), the second discharge pipe (28) and the tapered discharge pipe (32) move together in a direction away from the liquid inlet end connection flange (12) or in a direction close to the liquid inlet end connection flange (12), so that the tapered discharge pipe (32) maintains a suitable distance from the inner wall of the tank of the preparation equipment on which the feeding device is installed, and when the first discharge pipe (21) moves, it will pull the corrosion-resistant shrinkable corrugated hose (16) to stretch or shrink accordingly; S2: After the staff has maintained a suitable distance between the conical discharge pipe (32) and the inner wall of the tank of the preparation equipment on which the feeding device is installed, the staff can rotate the second discharge pipe (28) on the first discharge pipe (21) so that the rotating ring (31) on the second discharge pipe (28) rotates on the fixed sleeve (29). At the same time, since the rotating ring (31) and the fixed sleeve (29) are installed via a damping bearing, when the staff adjusts the angle of the second discharge pipe (28), the damping bearing between the rotating ring (31) and the fixed sleeve (29) can be used to keep the second discharge pipe (28) and the conical discharge pipe (32) at any state of the current angle. Then the staff can start the motor (23) again so that the output of the motor (23) The shaft drives the screw rod (24) to rotate and again engages with the transmission block (25) in threaded transmission, so that the transmission block (25) again drives the storage tank (22) and the first discharge pipe (21) to move in the storage tank (22) and the second pipe (17) toward the side of the liquid inlet end connecting flange (12). At the same time, the movement of the first discharge pipe (21) will drive the second discharge pipe (28) and the conical discharge pipe (32) to approach the inner wall of the tank of the preparation equipment on which the feeding device is installed. When the end of the conical discharge pipe (32) fits the inner wall of the tank of the preparation equipment, the staff can close the transmission block (25). At this time, an arc groove (34) for liquid circulation will be left between the conical discharge pipe (32) and the inner wall of the tank of the preparation equipment. S3: The staff can then prepare a liquid with the same properties as methyltetrahydrophthalic anhydride for debugging. The staff can transport the liquid into the electric control liquid valve (11) through the liquid inlet end connecting flange (12). At the same time, the liquid will enter the electric control liquid valve (11) through the liquid inlet end connecting flange (12) and be discharged from the liquid outlet end connecting flange (13). At this time, the liquid will enter the first discharge pipe (21) through the corrosion-resistant shrinkable corrugated hose (16) and be discharged from the second discharge pipe (28) from the conical discharge pipe (32). The liquid is discharged from the inside so that it can enter the arc groove (34) naturally left between the inner walls of the tank body of the preparation equipment and flow down along the inner wall of the tank body of the preparation equipment. The staff can then observe whether the liquid splashes or flows unstably, and adjust the distance by which the first discharge pipe (21) extends or retracts the liquid inlet end connecting flange (12) according to the phenomenon, and adjust the inclination angle of the second discharge pipe (28) and the tapered discharge pipe (32) until it is ensured that the liquid can flow in a stable manner on the inner wall of the tank body of the preparation equipment.

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