A processing aid delivery device for denatured starch pilot reaction

Abstract

The utility model relates to starch production technical field, concretely for a kind of processing auxiliary conveying device for modified starch pilot reaction, including test bed surface, stirring reaction tank and support being sequentially arranged on the length direction of test bed surface, reagent bottle being arranged on support, drainage pipeline being connected between stirring reaction tank and reagent bottle, reagent bottle is higher than stirring reaction tank, support adjusting mechanism includes the vertical plate being arranged on support and symmetrically located the both sides of reagent bottle, sliding plate being vertically slidably connected between two vertical plates, L-shaped frame being arranged on sliding plate, clamping mechanism being arranged on one side of two vertical plates, drive assembly being arranged on support;L-shaped frame horizontal section is detachably connected with drainage pipeline, drive assembly and clamping mechanism and L-shaped frame transmission connection, drive clamping mechanism to carry out clamping operation and L-shaped frame vertical movement. Avoid dripping to contaminate test bed surface or seep into stirring reaction tank, ensure that the component purity of modified starch pilot reaction system, guarantee the authenticity and repeatability of process parameter.

Description

Technical Field

[0001] This utility model relates to the field of starch production technology, specifically to a processing aid conveying device for pilot-scale reaction of modified starch. Background Technology

[0002] In the production of modified starch, pilot-scale reactions (such as crosslinking, esterification, etherification, etc.) are the key link between laboratory-scale trials and industrial production. At this stage, it is necessary to achieve precise, clean, and continuous delivery of processing aids (such as crosslinking agents, esterification agents, etc.) to the reaction system, while ensuring the sealing and ease of operation of the reaction process, so as to simulate industrial production conditions and obtain reliable process parameters.

[0003] Currently, there are some reagent delivery devices based on the siphon principle. For example, Chinese Patent No. CN206454667U discloses a simple, fast and convenient titration device. This device uses a siphon structure consisting of a pressure ball and a siphon tube to replenish the titration reagent. It uses a magnetic stirrer to replace manual shaking of the conical flask to promote solution mixing and has a white base plate to help identify the titration endpoint. In chemical titration analysis (such as water quality index determination), it effectively simplifies the operation process and reduces manual labor intensity.

[0004] However, the siphon tubing of this device is fixedly connected between the reagent bottle and the burette, making it impossible to adjust the insertion depth of the tubing according to changes in the liquid level in the reagent bottle. Since the processing aids used in the pilot-scale test of modified starch are mostly precisely prepared solutions, a fixed insertion depth can easily lead to concentration stratification due to a drop in liquid level, causing deviations from the preset concentration. Furthermore, inserting the tubing too deeply can draw in residual impurities from the bottom of the bottle, while inserting it too shallowly can lead to air aspiration, both affecting the accuracy of the pilot-scale test. After the test is completed, there is no tubing clamping mechanism, and residual reagent in the tubing can easily drip out, causing not only material waste but also contamination of the experimental platform and reaction system, affecting the accuracy of the pilot-scale results. Utility Model Content

[0005] The purpose of this invention is to provide a processing aid delivery device for pilot-scale reactions of modified starch, in order to solve the problems mentioned in the prior art in the background section.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a processing aid delivery device for pilot-scale reaction of modified starch, comprising a test platform, a stirring reaction vessel and a support arranged sequentially along the length of the test platform, a reagent bottle mounted on the support, and a drainage pipe connecting the stirring reaction vessel and the reagent bottle, wherein the reagent bottle is higher than the stirring reaction vessel. The device also includes a support and adjustment mechanism mounted on the support, comprising vertical plates symmetrically located on both sides of the reagent bottle on the support, a sliding plate vertically slidably connected between the two vertical plates, an L-shaped frame mounted on the sliding plate, a clamping mechanism on one side of the two vertical plates, and a driving assembly mounted on the support. The horizontal section of the L-shaped frame is detachably connected to the drainage pipe, and the driving assembly is drively connected to the clamping mechanism and the L-shaped frame, used to drive the clamping mechanism to perform clamping operations and the L-shaped frame to move vertically.

[0007] Furthermore, the drainage pipeline includes an L-shaped tube, a telescopic flexible tube, and a vertical tube connected in series; the horizontal section of the L-shaped frame is detachably connected to the horizontal section of the L-shaped tube by a clamp, the vertical section of the L-shaped tube is located inside the reagent bottle, the vertical tube is detachably connected to the stirring reaction vessel by a clamp, and a pressure ball is provided on the vertical tube.

[0008] Furthermore, the clamping mechanism includes a first L-shaped plate disposed on one side of the two vertical plates, a bidirectional screw rod rotatably connected between the two first L-shaped plates, a gear disposed in the middle of the bidirectional screw rod, and threaded seats threadedly connected to both ends of the bidirectional screw rod; both threaded seats are connected to limit rods through connecting rods, and the ends of the two limit rods that are far apart from each other are respectively horizontally slidably connected to the two first L-shaped plates, and a clamping plate is provided on one end of the two limit rods that are close to each other.

[0009] Furthermore, the drive assembly includes an electric actuator mounted on the bracket and located between the two vertical plates, and a second L-shaped plate mounted on one side of the slide plate; the vertical section of the second L-shaped plate is a rack, and the gear meshes with the rack.

[0010] Furthermore, the stirred reaction vessel consists of a tank body, a tank cover, a stirrer, and a discharge pipe; the tank cover is located on the tank body, the stirrer is located on the tank cover, the discharge pipe is located at the bottom of the tank body, the vertical pipe is detachably connected to the tank cover by a clamp and is located on one side of the stirrer, and the tank cover is provided with a feed pipe.

[0011] Furthermore, valves are provided on both the vertical pipe and the discharge pipe.

[0012] Furthermore, an electrical control cabinet is provided on one side of the test bench.

[0013] This utility model addresses the shortcomings of existing technologies by optimizing the structure and innovating the function, specifically offering the following advantages: 1. This utility model, through the linkage design of the support adjustment mechanism and the drive component, can synchronously drive the L-shaped tube of the drainage pipeline to move vertically. When the liquid level of the processing aid in the reagent bottle drops, the electric actuator drives the slide plate to move down along the vertical plate groove, so that the vertical section of the L-shaped tube always maintains a suitable depth of 2-3 cm with the processing aid in the reagent bottle. This avoids the intake of impurities from the bottom of the bottle and completely empties the aid in the reagent bottle (residual amount ≤0.5%). This solves the problem of raw material waste caused by incomplete delivery and ensures that the actual input of processing aids (such as crosslinking agents and esterifying agents) during pilot production is highly consistent with the preset process parameters. It avoids the reaction effect being affected by the deviation in the amount of aids used, and provides reliable data support for the calibration of industrial production parameters.

[0014] 2. This utility model achieves integrated control of pipeline adjustment and clamping sealing through the synchronous linkage of the clamping mechanism and the drive assembly. After the additive is delivered, the electric actuator moves the sliding plate upwards, and the rack of the second L-shaped plate synchronously drives the gear to rotate, causing the bidirectional screw to move the two threaded seats towards each other. Finally, the clamping plate forms a flexible compressive force on the horizontal section of the L-shaped tube made of elastic silicone material, completely closing the flow channel within the pipeline. This can seal residual additives within the pipeline, preventing dripping and contamination of the test bench surface or seeping into the mixing reaction vessel, ensuring the purity of the components in the modified starch pilot-scale reaction system, and guaranteeing the authenticity and repeatability of the process parameters. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a rear view of the present invention.

[0016] In the diagram: 1. Test bench; 2. Stirred reaction vessel; 3. Support; 4. Reagent bottle; 5. Vertical plate; 6. Slide plate; 7. L-shaped frame; 8. L-shaped tube; 9. Telescopic hose; 10. Vertical tube; 11. First L-shaped plate; 12. Bidirectional screw; 13. Gear; 14. Threaded seat; 15. Connecting rod; 16. Limiting rod; 17. Clamping plate; 18. Electric actuator; 19. Second L-shaped plate; 20. Tank body; 21. Tank cover; 22. Stirrer; 23. Discharge pipe; 24. Inlet pipe; 25. Valve; 26. Electrical control cabinet; 27. Pressure ball. Detailed Implementation

[0017] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. Figure 1-2As shown, this utility model discloses a processing aid delivery device for pilot-scale reactions of modified starch, comprising a test platform 1, a stirred reaction vessel 2 and a support 3 arranged sequentially along the length of the test platform 1, a reagent bottle 4 mounted on the support 3, a drainage pipe connecting the stirred reaction vessel 2 and the reagent bottle 4, and a support and adjustment mechanism mounted on the support 3. It is suitable for the precise and clean delivery of processing aids in the pilot-scale stages of modified starch (such as cross-linking and esterification reactions). The specific connection methods, working process, and technical effects of its components are as follows: The test platform 1 is made of 304 stainless steel (10mm thick). One end of the test platform 1 is detachably fixed to the bottom support leg of the stirring reaction vessel 2 by 4 sets of M8 bolts to ensure that the stirring reaction vessel 2 does not shift during operation. The other end of the test platform 1 is fixed with a stepped metal support 3 (Q235 steel) by welding. The area of ​​the top horizontal platform of the support 3 is adapted to the bottom area of ​​the reagent bottle 4, and a 2mm thick anti-slip rubber pad is pasted on the platform. The reagent bottle 4 (10L capacity, high borosilicate glass) is supported on the anti-slip rubber pad to prevent the reagent bottle 4 from sliding during transportation.

[0018] The stirred reaction vessel 2 is used to achieve the mixing reaction of modified starch raw materials and processing aids. It consists of a vessel body 20, a vessel cover 21, a stirrer 22, a discharge pipe 23, and a feed pipe 24. The vessel body 20 is a double-layered glass reaction vessel (50L volume, inner layer thickness 5mm, outer layer thickness 3mm). Its bottom is detachably fixed to the test platform 1 via three sets of adjustable support legs. The height of the support legs is adjustable from 50-80mm to accommodate receiving containers of different heights. The vessel cover 21 is a glass cover (8mm thick) that fits the vessel body 20. It is detachably and sealingly connected to the top of the vessel body 20 via flanges (made of 304 stainless steel) and six sets of M8 bolts. Silicone rubber sealing rings (3mm thick) are sandwiched between the flanges to ensure the sealing performance of the vessel body 20 and prevent the leakage of volatile substances during the reaction. At the center of the tank lid 21, a paddle-type agitator 22 (motor power 200W, speed adjustable from 0-1000r / min) is fixed via a metal mounting base. The agitator shaft of the agitator 22 passes through the tank lid 21 and extends into the tank body 20. The connection between the agitator shaft and the tank lid 21 is sealed by a mechanical seal. The control circuit of the agitator 22 is electrically connected to the electrical control cabinet 26, and the agitation rate can be adjusted via the knob on the electrical control cabinet 26. At the lowest point of the bottom of the tank body 20, a discharge pipe 23 (material 304 stainless steel, outer diameter 25mm) is welded on. A valve 25 (manual ball valve model Q11F-16P, DN20) is connected in series on the discharge pipe 23 to control the discharge of materials after reaction. The can lid 21 is also provided with a feed hole (30mm in diameter), and a feed pipe 24 (made of 304 stainless steel, 30mm outer diameter, 100mm length) is welded into the feed hole. The upper end of the feed pipe 24 is provided with a flip-top dust cover for adding modified starch raw materials into the can body 20 to prevent the raw materials from getting damp or contaminated. The height of the mouth of the reagent bottle 4 is 15-20cm higher than the height of the can lid 21 of the stirred reaction vessel 2 to meet the height difference requirement for the processing aid to be transported by the siphon effect. In addition, the central axis of the reagent bottle 4 and the central axis of the stirred reaction vessel 2 are in the same vertical plane to ensure that the force on the drainage pipeline is uniform.

[0019] The drainage pipeline connects reagent bottle 4 to the stirred reaction vessel 2, enabling the closed-loop delivery of processing aids. It consists of an L-shaped tube 8, a flexible telescopic hose 9, and a vertical tube 10 connected in series, with each connection point featuring a detachable, sealed design. The L-shaped tube 8 is made of food-grade elastic silicone (hardness 60 Shore A), with a horizontal outer diameter of 20mm. It is detachably and sealed to one end of the flexible telescopic hose 9 (made of PTFE corrugated tubing, inner diameter 20mm) using a DN15 food-grade clamp. The clamp tightening torque is controlled at 5-8 N·m to ensure no leakage. The other end of the flexible telescopic hose 9 is detachably and sealed to the upper end of the vertical tube 10 (made of hard borosilicate glass, outer diameter 20mm) using a DN15 clamp of the same specification. A 5-8cm allowance is provided in the length of the flexible telescopic hose 9 to facilitate subsequent vertical movement of the L-shaped tube 8. The lower end of the vertical tube 10 penetrates the stirred reaction vessel. The can lid 21 of the 2 has a pre-set mounting hole (diameter 21mm) and is detachably fixed to the can lid 21 by a DN15 clamp. The port of the vertical pipe 10 located inside the stirred reaction vessel 2 is 3-5cm away from the inner wall of the vessel body 20 to avoid direct impact on the impeller of the stirrer 22 during the delivery of processing aids and to prevent raw materials from splashing. A medical-grade rubber pressure ball 27 (volume 50mL) and a valve 25 (manual ball valve) are fixedly connected in the middle of the vertical pipe 10. The internal cavity of the pressure ball 27 is connected to the internal channel of the vertical pipe 10 to assist in starting the siphon effect or fine-tuning the delivery rate.

[0020] The support and adjustment mechanism is located on the bracket 3 and on one side of the reagent bottle 4. It is used to realize the vertical adjustment and clamping seal of the L-shaped tube 8. It consists of vertical plates 5, sliding plates 6, L-shaped frame 7, clamping mechanism and drive assembly. The two vertical plates 5 are rectangular metal plates (material Q235 steel, size 300mm×100mm×5mm). Their lower ends are detachably fixed to the top horizontal platform of the bracket 3 by 4 sets of M6 bolts. Vertical grooves (groove width 12mm, groove depth 5mm) are opened on the opposite side walls of the two vertical plates 5. The length of the groove is adapted to the moving stroke (30cm) of the sliding plate 6. The sliding plate 6 is a rectangular metal plate (material Q235 steel, size 150mm×100mm×5mm). Its two side edges are embedded into the vertical grooves of the two vertical plates 5 to form a clearance fit vertical sliding connection. The sliding plate 6 can move smoothly up and down along the groove without jamming. On one side of the upper part of the slide plate 6, an L-shaped metal frame 7 (made of Q235 steel, with a horizontal section length of 150mm and a vertical section height of 80mm) is fixed by welding. The horizontal section of the L-shaped frame 7 is connected by a clamp, which enables the L-shaped frame 7 to be detachably connected to the horizontal section of the L-shaped tube 8. This connection structure can move the L-shaped tube 8 vertically in sync with the movement of the slide plate 6, ensuring that the vertical section of the L-shaped tube 8 is always matched with the relative position of the reagent bottle 4.

[0021] The clamping mechanism is used to clamp and seal the horizontal section of the L-shaped tube 8 to prevent residual reagents from spilling from the pipeline. It consists of a first L-shaped plate 11, a bidirectional screw 12, a gear 13, a threaded seat 14, a limiting rod 16, and a clamping plate 17. Two first L-shaped plates 11 are symmetrically arranged metal plates (material Q235 steel, horizontal section length 120mm, vertical section height 100mm). The vertical section is detachably fixed to the side wall of the vertical plate 5 by two sets of M5 bolts. The horizontal sections are parallel to each other and extend away from the vertical plate 5. Between the horizontal sections of the two first L-shaped plates 11, a double-acting screw 12 (material 45 steel, length 180mm, pitch 2mm) is rotatably connected by a deep groove ball bearing (model 6202). The middle of the double-acting screw 12 is keyed to the gear 13 (module 2, number of teeth 20) by a flat key (model 6×6) to ensure that the gear 13 and the double-acting screw 12 rotate synchronously. The two ends of the double-acting screw 12 are respectively provided with external threads of opposite directions (left end left-handed, right end right-handed), and the two ends are respectively threaded to a threaded seat 14 (material Q235 steel, internal thread adapted to the double-acting screw 12). The upper side wall of the threaded seat 14 is bolted to the connecting rod 15 (material Q235 steel). One end of the connecting rod 15 is fixedly connected to the middle of the limiting rod 16 (material: 45 steel, diameter: 8mm, length: 100mm); one end of the limiting rod 16 passes through a pre-set guide hole (diameter: 8.5mm) on the horizontal section of the first L-shaped plate 11, forming a clearance fit horizontal sliding connection to ensure that the limiting rod 16 can only move in the horizontal direction; the ends of the two limiting rods 16 that are close to each other are detachably connected to a clamping plate 17 (material: nitrile rubber, arc radius: 10mm) by an M4 thread.

[0022] The drive assembly is used to synchronously drive the vertical movement of the slide plate 6 and the clamping / separating action of the clamping mechanism, including an electric actuator 18 and a second L-shaped plate 19. The electric actuator 18 is a small electric actuator (model XTL100, stroke 300mm, rated thrust 500N). Its cylinder bottom is detachably fixed to the top horizontal platform of the bracket 3 by 4 sets of M6 bolts, and the top of the piston rod is detachably fixed to the lower surface of the slide plate 6 by 2 sets of M5 bolts. The control circuit of the electric actuator 18 is electrically connected to the electrical control cabinet 26 located on one side of the test bench 1 through the wiring hole inside the test bench 1. The electrical control cabinet 26 integrates a PLC controller (model S7-200SMART) and a relay module, and the extension and retraction control of the electric actuator 18 can be realized through the buttons on the panel of the electrical control cabinet 26. A second L-shaped plate 19 (made of Q235 steel, with a vertical section height of 200mm) is welded to one side of the slide plate 6. The vertical section of the second L-shaped plate 19 extends toward the gear 13, and a rack (module 2, number of teeth 30) is machined on the side wall of the vertical section. The tooth surface of the rack is fully engaged with the tooth surface of the gear 13 to form a gear and rack transmission mechanism, ensuring that the movement of the slide plate 6 can synchronously drive the gear 13 to rotate.

[0023] II. Working process of this utility model: 1. Open the lid 21 of the stirred reaction vessel 2, and add the preset amount of modified starch raw material (such as 10kg of corn starch) into the vessel 20 through the feed pipe 24. Close the lid 21 and tighten the flange bolts to ensure that the vessel 20 is sealed. Add the processing aid to be transported (such as crosslinking agent sodium trimetaphosphate solution, concentration 5%) into the reagent bottle 4. Open the valve 25 (manual ball valve) on the vertical pipe 10. Press the piston rod of the control electric push rod 18 through the electrical control cabinet 26 to retract it, which will drive the slide plate 6 to move downward along the slide groove of the vertical plate 5. The slide plate 6 will simultaneously drive the L-shaped frame 7 and L-shaped tube 8 to move downward until the vertical section of the L-shaped tube 8 is inserted into the reagent bottle 4 and the end is inserted into the processing aid 2-3cm into the reagent bottle 4 (to avoid sucking in impurities at the bottom of the bottle). During this process, the rack of the second L-shaped plate 19 moves downward with the slide plate 6, driving the gear 13 to rotate. The gear 13 synchronously drives the bidirectional screw 12 to rotate. Since the threads at both ends of the bidirectional screw 12 rotate in opposite directions, the two threaded seats 14 move away from each other along the bidirectional screw 12. Through the connecting rod 15, the two limiting rods 16 are pulled to slide away from the L-shaped tube 8. The two clamping plates 17 separate (the distance increases to 25mm), releasing the clamping of the horizontal section of the L-shaped tube 8 and ensuring that the drainage pipeline is unobstructed.

[0024] 2. Squeeze the pressure ball 27 by hand to expel the air inside, then release it. Utilize the pressure difference to initiate the siphon effect. Due to the 15-20cm height difference between reagent bottle 4 and the stirred reaction vessel 2, the processing aid in reagent bottle 4 is smoothly transported to the stirred reaction vessel 2 via the siphon effect, following the path of L-shaped tube 8 → telescopic hose 9 → vertical tube 10. Simultaneously, start the stirrer 22 via the electrical control cabinet 26, adjusting the speed to 300r / min. The impeller of stirrer 22 mixes the starch raw material and processing aid in the vessel 20, ensuring uniform dispersion of the aid and avoiding excessive localized reactions. As the liquid level of the processing aid in reagent bottle 4 decreases, synchronously adjust the piston rod position of the electric actuator 18 so that the vertical section of the L-shaped tube 8 always extends 2-3cm into the processing aid in reagent bottle 4.

[0025] 3. When the processing aid in reagent bottle 4 has been completely delivered and processing aid needs to be added to reagent bottle 4: the piston rod of electric push rod 18 is fully extended (stroke 300mm) by control cabinet 26, driving slide plate 6 to move upward along slide groove, and L-shaped frame 7 simultaneously drives the vertical section of L-shaped tube 8 to be pulled out from reagent bottle 4; during this process, the rack of second L-shaped plate 19 moves upward with slide plate 6, driving gear 13 to rotate in the opposite direction, and bidirectional screw 12 rotates in the opposite direction simultaneously, and two threaded seats 14 move towards each other along bidirectional screw 12, pushing two limiting rods 16 to slide towards the horizontal section of L-shaped tube 8 through connecting rod 15, until the two clamping plates 17 are tightly attached to the outer wall of L-shaped tube 8. Since L-shaped tube 8 is made of elastic silicone material, it undergoes elastic deformation under the squeezing force (about 50N) of clamping plate 17, and its internal flow channel is completely closed (cross-sectional area approaches 0), realizing the clamping and sealing of the horizontal section of L-shaped tube 8. At this time, the residual processing aid (about 1-2 mL) in the drainage tube is sealed in the L-shaped tube 8 and the vertical tube 10 and cannot flow out. After the residual reagent on the vertical section of the L-shaped tube 8 is dripped into the reagent bottle 4, the reagent bottle 4 is removed and the processing aid is added. No reagent is spilled on the test table 1 and the support 3. After the processing aid is added to the reagent bottle 4, it is placed back on the anti-slip rubber pad of the support 3, the piston rod of the control electric push rod 18 is retracted, the clamp 17 is separated, the L-shaped tube 8 is reset, and the next delivery operation can be started.

[0026] 4. After the experiment is completed: the piston rod of the electric push rod 18 is extended 2 / 3 by the control cabinet 26, driving the slide plate 6 to move upward along the slide groove. The L-shaped frame 7 simultaneously drives the vertical section of the L-shaped tube 8 to be pulled out from the reagent bottle 4. At this time, the two clamps 17 do not clamp the outer wall of the L-shaped tube 8. Its internal flow channel is open, and the residual processing aid (about 1-2 mL) in the drainage pipe flows into the stirring reaction vessel 2 or the reagent bottle 4. After the residual reagent has drained, the reagent bottle 4 and the drainage pipe are removed and cleaned for subsequent delivery operations.

Claims

1. A processing aid delivery device for a pilot-scale reaction of modified starch, comprising a test platform (1), a stirred reaction vessel (2) and a support (3) arranged sequentially along the length of the test platform (1), a reagent bottle (4) mounted on the support (3), and a drainage pipe connecting the stirred reaction vessel (2) and the reagent bottle (4), wherein the reagent bottle (4) is higher than the stirred reaction vessel (2), characterized in that, It also includes a support adjustment mechanism on the bracket (3), the support adjustment mechanism including vertical plates (5) on the bracket (3) and symmetrically located on both sides of the reagent bottle (4), a sliding plate (6) vertically slidably connected between the two vertical plates (5), an L-shaped frame (7) on the sliding plate (6), a clamping mechanism on one side of the two vertical plates (5), and a driving component on the bracket (3); the horizontal section of the L-shaped frame (7) is detachably connected to the drainage pipe, and the driving component is connected to the clamping mechanism and the L-shaped frame (7) for driving the clamping mechanism to perform clamping operation and the L-shaped frame (7) to move vertically.

2. The conveying device as described in claim 1, characterized in that, The drainage pipeline includes an L-shaped tube (8), a telescopic hose (9), and a vertical tube (10) connected in series. The horizontal section of the L-shaped frame (7) is detachably connected to the horizontal section of the L-shaped tube (8) by a clamp. The vertical section of the L-shaped tube (8) is located inside the reagent bottle (4). The vertical tube (10) is detachably connected to the stirring reaction vessel (2) by a clamp. A pressure ball (27) is provided on the vertical tube (10).

3. The conveying device as described in claim 1, characterized in that, The clamping mechanism includes a first L-shaped plate (11) on one side of the two vertical plates (5), a bidirectional screw (12) rotatably connected between the two first L-shaped plates (11), a gear (13) in the middle of the bidirectional screw (12), and threaded seats (14) threaded to both ends of the bidirectional screw (12); both threaded seats (14) are connected to limit rods (16) through connecting rods (15), and the ends of the two limit rods (16) that are far apart from each other are respectively horizontally slidably connected to the two first L-shaped plates (11), and a clamping plate (17) is provided on one end of the two limit rods (16) that are close to each other.

4. The conveying device as described in claim 3, characterized in that, The drive assembly includes an electric actuator (18) mounted on the bracket (3) and located between the two vertical plates (5), and a second L-shaped plate (19) mounted on one side of the slide plate (6); the vertical section of the second L-shaped plate (19) is a rack, and the gear (13) meshes with the rack.

5. The conveying device as described in claim 2, characterized in that, The stirred reaction vessel (2) consists of a tank body (20), a tank cover (21), a stirrer (22), and a discharge pipe (23). The tank cover (21) is located on the tank body (20), the stirrer (22) is located on the tank cover (21), the discharge pipe (23) is located at the bottom of the tank body (20), the vertical pipe (10) is detachably connected to the tank cover (21) by a clamp and is located on one side of the stirrer (22), and the tank cover (21) is provided with a feed pipe (24).

6. The conveying device as described in claim 5, characterized in that, Both the vertical pipe (10) and the discharge pipe (23) are equipped with valves (25).

7. The conveying device as described in claim 5, characterized in that, An electrical control cabinet (26) is provided on one side of the test bench (1).

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