A device and process for preparing soluble dietary fiber from pear pomace

Abstract

This invention relates to the field of agricultural product deep processing technology, and in particular to a device and process for preparing soluble dietary fiber from pear pomace. The device includes a base on which multiple support frames are fixedly mounted a tank. A combined tank is rotatably connected to the upper part of the tank's interior. A lifting plate is slidably connected to the inner wall of the tank. A lifting push rod is installed on the top of the base, slidably connected to the tank and with its output end fixedly connected to the bottom of the lifting plate. A filtration mechanism is installed inside the lifting plate. A rotating column is rotatably connected to the top of the tank via a motor. A stirring blade is spring-connected to the upper end of the rotating column, and the stirring blade is slidably connected to the lifting plate. A crushing mechanism is installed inside the support frames. This invention concentrates the originally complex and dispersed steps into a single tank, completing the complex preparation of soluble dietary fiber from pear pomace. The steps are simple, clean, and convenient, greatly improving production efficiency and offering strong adaptability.

Description

Technical Field

[0001] This invention relates to the field of agricultural product deep processing technology, and in particular to a device and process for preparing soluble dietary fiber from pear pomace. Background Technology

[0002] Pear pomace is a major byproduct of pear juice and canned pear production. It is rich in dietary fiber, the seventh essential nutrient, found in relatively high amounts in various fruits, ranging from approximately 16.74% to 91.24% by mass. Dietary fiber includes indigestible polysaccharides, lignin, oligosaccharides, and related plant substances. It can be completely or partially fermented in the large intestine but is not digested or absorbed in the small intestine. Pear processing often focuses on fruit juice products, and the resulting pear pomace, due to its high stone cell content, is difficult to digest and therefore unsuitable as animal feed. Improper handling of pear pomace leads to the waste of natural resources and environmental pollution. Pear pomace contains a large amount of free sugars, flavonoids, and dietary fiber, making it a good source of high-quality dietary fiber. Currently, common extraction methods for dietary fiber include chemical methods, ultrasonic-assisted methods, microwave-assisted methods, and enzymatic methods.

[0003] Some steps in existing methods are not applicable to large-scale industrial production. For example, processing the pear pomace after juicing Korla fragrant pears into dry powder for SDF extraction increases production costs and is clearly not economically efficient. Existing equipment is mostly single-function reaction or extraction tanks. Steps such as enzymatic hydrolysis, physical field-assisted extraction, and solid-liquid separation require material transfer between different devices, which is cumbersome and time-consuming. Furthermore, traditional stirring paddles can only mix materials macroscopically and cannot break down the tight cell wall structure of pear pomace composed of cellulose, hemicellulose, and lignin. This results in low enzyme-substrate contact efficiency, requiring longer processing times and larger liquid-to-material ratios, increasing energy and water consumption, and increasing the burden on subsequent concentration and purification. Therefore, some steps need to be improved. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of low processing efficiency and cumbersome steps in the prior art, and to propose a device for preparing soluble dietary fiber from pear pomace.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a pear pomace soluble dietary fiber preparation device, comprising a base, several support frames bolted to the top of the base, a tank body being fixed to the top of the support frames, a combined tank being rotatably connected to the upper end of the tank body, the inner wall of the tank body having the same dimensions as the inner wall of the combined tank, a lifting plate being slidably and sealingly connected to the inner wall of the tank body, a lifting push rod being installed on the top of the base, the lifting push rod being slidably and penetratingly connected to the tank body and its output end being fixedly connected to the bottom of the lifting plate, a filtering mechanism being installed inside the lifting plate, a rotating column being rotatably connected to the top of the tank body via a motor, a stirring blade being spring-connected to the upper end of the rotating column, the stirring blade being slidably and penetratingly connected to the lifting plate, and a crushing mechanism being installed inside the support frames.

[0006] In the above-mentioned pear pomace soluble dietary fiber preparation device, a feeding pipe is installed at the top of the tank, several liquid adding pipes are installed at the top of the tank, a liquid discharging pipe is installed at the bottom of the tank, and a control valve is installed inside each of the liquid adding pipes and the liquid discharging pipes. A control panel is installed on the outer surface of the tank, and the control panel is electrically connected to the internal structure of the tank.

[0007] In the above-mentioned pear pomace soluble dietary fiber preparation device, the outer side of the tank has side doors at the upper and lower ends. The upper side door corresponds to the position of the combined tank, and the lower side door corresponds to the position of the control panel. The combined tank is assembled from multiple freely detachable arc-shaped combined plates. A heating plate is installed on the inner wall of the tank, and the heating plate is located below the combined tank.

[0008] In the above-mentioned pear pomace soluble dietary fiber preparation device, the crushing mechanism includes several rotating blades, the support frame has a storage groove inside, the storage groove is slidably connected to a snap-fit ​​block by an electric push rod, the snap-fit ​​block is electromagnetically attracted to several snap-fit ​​connectors facing the inside of the combined tank, the combined tank has a movable groove, the snap-fit ​​connectors are slidably and sealed to the movable groove, and the snap-fit ​​connectors facing the side of the combined tank are rotatably connected to the rotating blades by a built-in servo motor.

[0009] In the above-mentioned pear pomace soluble dietary fiber preparation device, several rotating blades are arranged in an array with the center of the tank as the center. Inside the combined tank, a snap-fit ​​frame is installed by an electric push rod, and the snap-fit ​​frame corresponds to the snap-fit ​​connector.

[0010] In the above-mentioned pear pomace soluble dietary fiber preparation device, the filtration mechanism includes a rotating filter plate, the lifting plate has several filter holes through it, the rotating filter plate is an annular plate structure and an internal gear is installed on its inner side, the lifting plate has a drive gear installed inside it, the drive gear meshes with the internal gear, and the rotating filter plate is located inside the lifting plate and is sealed and rotatably connected to the lifting plate.

[0011] In the above-mentioned pear pomace soluble dietary fiber preparation device, the bottom of the tank has a groove and an air-filling pipe is installed inside the groove. The air-filling pipe is spirally stored at the bottom of the tank and the top of the air-filling pipe is inserted into the lifting plate. Several air-jet frames are installed on the upper side of the lifting plate. The air-jet frames and the air-filling pipe are connected inside the lifting plate. The air-jet frames are offset from the filter holes and are located above the rotating filter plate.

[0012] A process for preparing soluble dietary fiber from pear pomace includes the following steps: S1, Raw material pretreatment: Take fresh Korla fragrant pears, remove the core and pear stem, press to extract juice, collect the obtained fresh pear pulp, crush and mix it, freeze and store for later use. S2, Enzymatic hydrolysis reaction: Take the fresh pear residue obtained in step S1, add distilled water and adjust the pH, and add a compound enzyme preparation at the same time. The mixture is then enzymatically hydrolyzed at a constant temperature. The compound enzyme preparation consists of the following four enzymes: xylanase, hemicellulase, pectinase and peak α-amylase. S3, Enzyme Inactivation: After the enzymatic hydrolysis is completed, the reaction system is kept in a high-temperature constant temperature environment to inactivate the enzyme. S4, Solid-liquid separation: The enzyme-inactivated material is filtered and separated, and the filter residue and filtrate are collected separately; the filter residue is dried under vacuum at a constant temperature to constant weight to obtain insoluble dietary fiber; S5, alcohol precipitation: Add anhydrous ethanol to the filtrate obtained in step S4, heat at a constant temperature, and then let stand overnight to allow the soluble dietary fiber to precipitate fully. S6, Drying: The precipitate obtained in step S5 is vacuum filtered, the filter cake is collected, vacuum dried to constant weight, and then pulverized to obtain pear pomace soluble dietary fiber. S7, Blank Correction: Simultaneously conduct a blank control experiment without pear pomace, following steps S2 to S6. The resulting mass is used to correct the final product yield.

[0013] Compared with existing technologies, the advantages of this invention are: 1. This invention integrates multiple processes such as crushing, enzymatic hydrolysis, enzyme inactivation, and solid-liquid separation into a single tank, changing the cumbersome mode of traditional processes that require repeated material transfer between multiple devices. The lifting push rod controls the position of the filter plate, which can achieve solid-liquid coexistence during the enzymatic hydrolysis process and quickly complete filtration and slag discharge during the separation stage. The top feeding pipe and multiple liquid feeding pipes can simultaneously add pear residue, water, enzyme preparations, and acid-base regulators, avoiding cross-contamination of pipelines.

[0014] 2. This invention utilizes a unique synergistic crushing and mixing mechanism. The rotating blades extend into the combined tank via a snap-fit ​​structure, forming a counter-rotating motion with the stirring blades. This allows the pear pomace to be fully crushed and mixed under the dual action of macroscopic stirring and microscopic cutting. Each rotating blade can be independently controlled by a built-in servo motor, achieving a multi-stage adjustable crushing mode from coarse crushing to fine grinding. This ensures that different batches of pear pomace can achieve the optimal enzymatic hydrolysis particle size. The stirring blades adopt a spring connection design, which can automatically extend and retract when the lifting plate moves, ensuring that the stirring coverage area is dynamically adjusted according to changes in the liquid level, thereby increasing the specific surface area of ​​contact between the enzyme and the substrate.

[0015] 3. This invention prepares soluble dietary fiber from pear pomace through enzymatic hydrolysis using a compound enzyme. Using SDF yield as an indicator, the optimal extraction process for SDF was determined using single-factor experiments and response surface methodology. The SDF yield of different enzyme combinations was explored, providing a theoretical basis for pear pomace as a good source of dietary fiber. The process route for high utilization of pear pomace was optimized in three steps, from single enzymes to compound enzymes, gradually screening out highly efficient enzyme combinations. This efficiently and economically extracts soluble dietary fiber from fresh pear pomace of Korla fragrant pears. The process is stable and feasible, and can significantly increase the yield of SDF in Korla fragrant pear pomace. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a pear pomace soluble dietary fiber preparation device proposed in this invention. Figure 2 This is a schematic diagram of the internal structure of a pear pomace soluble dietary fiber preparation device proposed in this invention. Figure 3 for Figure 2 A magnified structural diagram of part A in the middle; Figure 4 This is a schematic diagram of the frame portion of the pear pomace soluble dietary fiber preparation device proposed in this invention; Figure 5 This is a schematic diagram of the internal structure of the lifting plate of the pear pomace soluble dietary fiber preparation device proposed in this invention; Figure 6 for Figure 5 A magnified structural diagram of part B in the middle section; Figure 7 This is a flowchart illustrating the process steps for preparing soluble dietary fiber from pear pomace according to the present invention.

[0017] In the diagram: 1. Base; 2. Tank body; 3. Support frame; 4. Side door; 5. Feeding pipe; 6. Liquid outlet pipe; 7. Liquid filling pipe; 8. Gas filling pipe; 9. Combined tank; 10. Clip-on frame; 11. Clip-on connector; 12. Rotating blade; 13. Movable groove; 14. Clip-on block; 15. Storage groove; 16. Heating plate; 17. Rotating column; 18. Stirring blade; 19. Lifting plate; 20. Filter hole; 21. Jet frame; 22. Rotating filter plate; 23. Internal gear; 24. Drive gear; 25. Lifting push rod; 26. Control panel. Detailed Implementation

[0018] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0019] Reference Figure 1-3 A device for preparing soluble dietary fiber from pear pomace includes a base 1, several support frames 3 are bolted to the top of the base 1, and a tank 2 is fixed to the top of the support frames 3. A combined tank 9 is rotatably connected to the upper end of the tank 2. The inner wall of the tank 2 has the same dimensions as the inner wall of the combined tank 9. A lifting plate 19 is slidably connected to the inner wall of the tank 2 for separating liquid and solid. A lifting push rod 25 is installed on the top of the base 1. The lifting push rod 25 is slidably connected to the tank 2 and its output end is fixedly connected to the bottom of the lifting plate 19, allowing free control of the height of the lifting plate 19. A filtration mechanism is installed inside the lifting plate 19 to facilitate the rapid acquisition of filtrate and filter residue. A rotating column 17 is rotatably connected to the top of the tank 2 via a motor. A stirring blade 18 is spring-connected to the upper end of the rotating column 17. The stirring blade 18 is slidably connected to the lifting plate 19. A crushing mechanism is installed inside the support frames 3.

[0020] A feeding pipe 5 is installed on the top of the tank body 2, and several liquid filling pipes 7 are installed on the top of the tank body 2. A liquid outlet pipe 6 is installed at the bottom of the tank body 2. Each of the liquid filling pipes 7 and the liquid outlet pipe 6 is equipped with a control valve. A control panel 26 is installed on the outer surface of the tank body 2. The control panel 26 is electrically connected to the internal structure of the tank body 2 and can adjust the process parameters of the device at any time.

[0021] The tank body 2 has side doors 4 at the upper and lower ends. The upper side door 4 corresponds to the position of the combined tank 9. Opening it allows for quick removal of the filter residue on the upper side of the lifting plate 19. The lower side door 4 corresponds to the position of the control panel 26. Opening it allows for quick removal of the filter residue on the lower side of the lifting plate 19. The combined tank 9 is assembled from multiple freely detachable arc-shaped combined plates. A heating plate 16 is installed on the inner wall of the tank body 2. The heating plate 16 is located below the combined tank 9 and allows for free adjustment of the liquid temperature.

[0022] The crushing mechanism includes several rotating blades 12. The support frame 3 has a storage groove 15 inside. Inside the storage groove 15, a locking block 14 is slidably connected via an electric push rod. The locking block 14, facing the inside of the combined tank 9, is electromagnetically attracted to several locking connectors 11. The combined tank 9 has a movable groove 13. The locking connectors 11 are slidably connected to the movable groove 13 in a sealed manner. The locking connectors 11 facing the side of the combined tank 9 are rotatably connected to the rotating blades 12 via a built-in servo motor. Several rotating blades 12 are arranged in an array with the center of the tank body 2 as the center. Inside the combined tank 9, a locking frame 10 is installed via an electric push rod. The locking frame 10 corresponds to the locking connectors 11. When the rotating blades 12 extend into the combined tank 9, the locking frame 10 descends and locks, controlling the locking block 14 to disconnect from the locking connectors 11 through electromagnetic attraction. The rotating column 17 is controlled to rotate in the opposite direction to the combined tank 9. The stirring blades break up the pear pulp, and the rotating blades 12 perform fine crushing. The angle of each rotating blade 12 can be freely controlled by the servo motor, quickly achieving different levels of fine rotating crushing.

[0023] Reference Figure 4-6 The filtration mechanism includes a rotating filter plate 22 and a lifting plate 19 through which several filter holes 20 are opened. The rotating filter plate 22 is a ring-shaped plate structure and an internal gear 23 is installed on its inner side. A drive gear 24 is installed inside the lifting plate 19. The drive gear 24 meshes with the internal gear 23. The rotating filter plate 22 is located inside the lifting plate 19 and is sealed and rotatably connected to the lifting plate 19. The degree of overlap between the rotating filter plate 22 and the filter holes 20 of the lifting plate 19 is controlled to adjust the filtration accuracy.

[0024] The bottom of the tank 2 has a groove and a gas supply pipe 8 is installed inside the groove. The gas supply pipe 8 is spirally stored at the bottom of the tank 2, and the top of the gas supply pipe 8 is inserted into the lifting plate 19. Several jet racks 21 are installed on the upper side of the lifting plate 19. The jet racks 21 are connected to the gas supply pipe 8 inside the lifting plate 19. The positions of the jet racks 21 and the filter holes 20 are staggered. The jet racks 21 are located above the rotating filter plate 22. When the lifting plate 19 is at the bottom of the combined tank 9, the gas supply pipe 8 extends from the bottom of the tank 2. A protective gas, such as nitrogen, is introduced through the gas supply pipe 8 while crushing the pear residue and solvent, and the air that entered when the sludge was added to the tank 2 is discharged. This promotes stirring and crushing while ensuring that the entire reaction is in a pure environment.

[0025] In this invention, before the device operates, fresh Korla fragrant pears are taken, and the cores and stems are removed using specialized equipment before the juice is extracted. The fresh pear pulp is collected, crushed, and mixed, and then frozen for later preparation of soluble dietary fiber from the pear pulp. The lifting push rod 25 is controlled so that the lifting plate 19 is located at the bottom of the combined tank 9. The pear pulp that has been initially crushed and mixed is added into the tank 2 through the feeding pipe 5. At the same time as the pear pulp is added, the electric push rod inside the support frame 3 is extended so that the snap-fit ​​connector 11, which is electromagnetically connected to the snap-fit ​​block 14, extends into the tank 2. When the rotating blade 12 extends into the combined tank 9, the snap-fit ​​frame 10 descends and locks. The snap-fit ​​block 14 is controlled to disconnect the electromagnetic adsorption connection with the snap-fit ​​connector 11. The rotating column 17 is controlled to rotate in the opposite direction to the combined tank 9. The stirring blade 18 disperses the pear pulp, and the rotating blade 12 performs fine crushing. Each rotating blade 12 can be freely controlled by a servo motor to achieve different levels of fine rotational crushing quickly, resulting in fully crushed pear pulp.

[0026] While crushing, distilled water is added through the liquid addition pipe 7 at a material-to-liquid ratio of 1:10 to adjust the pH to 5.0. Simultaneously, a compound enzyme preparation is added to ensure sufficient contact between the liquid solvent and the pear pomace. The heating plate 16 maintains a constant temperature inside the tank 2, promoting stable enzymatic hydrolysis. During the enzymatic hydrolysis process, the gear 24 rotates, controlling the holes of the rotating filter plate 22 to be offset from the filter holes 20, ensuring sufficient contact and reaction between the liquid and the pomace. The compound enzyme preparation consists of multiple enzymes, including but not limited to xylanase, hemicellulase, pectinase, and peak α-amylase. For example, the amount of xylanase added is 0.8% of the pear pomace mass, while the amounts of hemicellulase, pectinase, and peak α-amylase are all 1% of the pear pomace mass. Multiple liquid addition pipes 7 can simultaneously add different enzymes, avoiding cross-contamination of the liquids in the pipelines.

[0027] When the lifting plate 19 is at the bottom of the combined tank 9, the gas supply pipe 8 extends from the bottom of the tank 2. A protective gas, such as nitrogen, is introduced through the gas supply pipe 8 while the pear residue and solvent are being crushed. This discharges the air that entered when the sludge was added to the tank 2, promoting stirring and crushing while ensuring the entire reaction occurs in a pure environment. Other pure gases can also be introduced to accommodate different fermentation conditions.

[0028] After crushing, a full reaction is carried out. After enzymatic hydrolysis, the temperature is maintained at 95°C for 15 minutes by heating plate 16 to deactivate the enzyme. The liquid can be discharged by rotating filter plate 22. New solvent is added through liquid addition pipe 7. If more reaction solvent is needed, the lifting plate 19 is moved downward by lifting push rod 25 to add more solvent, so that the internal space of the tank is fully utilized. The temperature of heating plate 16 can be freely adjusted by controlling the heating plate 16, and protective gas is introduced to promote contact.

[0029] After enzyme inactivation, the material is filtered through a lifting plate 19 and a rotating filter plate 22, collecting filter residue and filtrate respectively. The filter residue is always positioned above the lifting plate 19. The lifting plate 19 moves upward, transporting all accumulated filter residue to the top of the combined tank 9 for compression to discharge the filtrate. The filtration accuracy is adjusted by controlling the overlap of the filter holes 20 of the rotating filter plate 22 and the lifting plate 19. The fully compressed residue can be better discharged. The compressed filter residue can be quickly removed by simply opening the side door 4 and removing a small portion of the combined tank 9. After removal, the filter residue is vacuum dried at a constant temperature until constant weight, and the weight of insoluble dietary fiber is recorded. Four times the volume of anhydrous ethanol is added to the filtrate at the bottom of the lifting plate 19. The heating plate 16 operates to uniformly heat the inside of the tank 2, ensuring uniform control. The internal temperature of tank 2 is increased, and then left to stand overnight to allow the soluble dietary fiber to fully precipitate. The filtration precision of the lifting plate 19 is adjusted to make it finer, so that the lifting plate presses down to fully precipitate the soluble dietary fiber and then closes the lifting plate 19 again. Then the lifting plate 19 separates the liquid from the pressed precipitated filter cake by lifting it upward. The lower side door 4 opposite the control panel 26 is opened to quickly remove the filter cake for cleaning. The removed filter cake is vacuum dried to constant weight by external equipment, and the weight of the pear pomace soluble dietary fiber is recorded. Then the side door 4 is closed to drain the liquid inside tank 2. The device concentrates the originally complex and scattered steps into the same tank 2 to complete the complex preparation of pear pomace soluble dietary fiber. The steps are simple and easy to clean, which greatly improves the production efficiency and has strong adaptability.

[0030] Reference Figure 7 A process for preparing soluble dietary fiber from pear pomace includes the following steps: A process for preparing soluble dietary fiber from pear pomace, characterized by comprising the following steps: S1, Raw material pretreatment: Take fresh Korla fragrant pears, remove the core and pear stem, press to extract juice, collect the obtained fresh pear pulp, crush and mix it, freeze and store for later use. S2, Enzymatic hydrolysis reaction: Take the fresh pear residue obtained in step S1, add distilled water and adjust the pH, and add a compound enzyme preparation at the same time. The mixture is then enzymatically hydrolyzed at a constant temperature. The compound enzyme preparation consists of the following four enzymes: xylanase, hemicellulase, pectinase and peak α-amylase. S3, Enzyme Inactivation: After the enzymatic hydrolysis is completed, the reaction system is kept in a high-temperature constant temperature environment to inactivate the enzyme. S4, Solid-liquid separation: The enzyme-inactivated material is filtered and separated, and the filter residue and filtrate are collected separately; the filter residue is dried under vacuum at a constant temperature to constant weight to obtain insoluble dietary fiber; S5, alcohol precipitation: Add anhydrous ethanol to the filtrate obtained in step S4, heat at a constant temperature, and then let stand overnight to allow the soluble dietary fiber to precipitate fully. S6, Drying: The precipitate obtained in step S5 is vacuum filtered, the filter cake is collected, vacuum dried to constant weight, and then pulverized to obtain pear pomace soluble dietary fiber. S7, Blank Correction: Simultaneously conduct a blank control experiment without pear pomace, following steps S2 to S6. The resulting mass is used to correct the final product yield.

[0031] The pear pomace soluble dietary fiber was prepared using a pear pomace soluble dietary fiber preparation device according to the above-mentioned pear pomace soluble dietary fiber preparation process. The specific steps are as follows: Fresh pear pomace and distilled water of Korla fragrant pears are added to tank 1 according to a fixed material-to-liquid ratio. The pomace is physically crushed by rotating blade 12. Solvent is added using the matching liquid addition tube 7. The pH of the solution is adjusted to the enzymatic hydrolysis conditions set for this batch using NaOH and 1:3 H3PO4. Enzyme reagents such as cellulase, xylanase, saccharifying enzyme, hemicellulase, pectinase, peak α-amylase, and papain are added according to different enzyme base mass ratios. The heating plate 16 and stirring blade 18 are turned on to promote enzymatic hydrolysis. Enzymatic hydrolysis is carried out at a constant temperature to inactivate the enzymes. The residue and filtrate are separated by lifting plate 19. The residue is dried under constant temperature and reduced pressure and weighed to obtain pear pomace insoluble dietary fiber IDF. The filtrate is left in tank 2. Four times the volume of 99% anhydrous ethanol is added for overnight alcohol precipitation. The residue and filtrate are separated again by lifting plate 19 the next day. The precipitate is removed and dried under constant temperature and reduced pressure and weighed to obtain pear pomace soluble dietary fiber SDF. For each different enzyme base mass ratio, a corresponding blank control was prepared. Fresh pear pomace was not added. All other operations were kept consistent with the sample, and the weight was recorded.

[0032] The yield of soluble dietary fiber is calculated using the following formula: SDF yield of fresh pear pomace (%) = SDF mass (g) after constant temperature vacuum drying / fresh pear pomace mass (g) * 100%.

[0033] After each batch of work, internal cleaning was performed to avoid errors in data from different batches. The yield of soluble dietary fiber was calculated after each batch of work for different processes, serving as a control experiment for the preparation of soluble dietary fiber from pear pomace under different original parameters.

[0034] The method of this invention can efficiently and economically extract soluble dietary fiber from fresh pear pomace of Korla fragrant pears. The process is stable and feasible, opening up a new avenue for the comprehensive utilization of pear pomace.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for preparing soluble dietary fibre from pear pomace comprising a base (1), characterised in that, Several support frames (3) are bolted on the top of the base (1). The tank (2) is fixed on the top of the support frames (3). A combined tank (9) is rotatably connected to the upper part of the tank (2). The inner wall of the tank (2) is the same size as the inner wall of the combined tank (9). A lifting plate (19) is slidably connected to the inner wall of the tank (2). A lifting push rod (25) is installed on the top of the base (1). The lifting push rod (25) is slidably connected to the tank (2) and its output end is fixedly connected to the bottom of the lifting plate (19). A filter mechanism is installed inside the lifting plate (19). A rotating column (17) is rotatably connected to the top of the tank (2) by a motor. A stirring blade (18) is connected to the upper end of the rotating column (17) by a spring. The stirring blade (18) is slidably connected to the lifting plate (19). A crushing mechanism is installed inside the support frame (3).

2. The apparatus for preparing soluble dietary fiber from pear pomace according to claim 1, characterized in that, The tank (2) is equipped with a feeding pipe (5) at the top, and several liquid filling pipes (7) are installed at the top of the tank (2). The tank (2) is equipped with a liquid outlet pipe (6) at the bottom. Each of the liquid filling pipes (7) and the liquid outlet pipes (6) is equipped with a control valve. The tank (2) is equipped with a control panel (26) on its outer surface. The control panel (26) is electrically connected to the internal structure of the tank (2).

3. The apparatus for preparing soluble dietary fiber from pear pomace according to claim 1, characterized in that, The tank body (2) has side doors (4) at the upper and lower ends on the outside. The upper side door (4) corresponds to the position of the combined tank (9), and the lower side door (4) corresponds to the position of the control panel (26). The combined tank (9) is assembled from multiple freely detachable arc-shaped combination plates. A heating plate (16) is installed on the inner wall of the tank body (2). The heating plate (16) is located below the combined tank (9).

4. The apparatus for preparing soluble dietary fiber from pear pomace according to claim 1, characterized in that, The crushing mechanism includes several rotating blades (12). The support frame (3) has a storage groove (15) inside. The storage groove (15) is slidably connected to a snap-fit ​​block (14) through an electric push rod. The snap-fit ​​block (14) is connected to several snap-fit ​​connectors (11) in the direction facing the inside of the combination tank (9) through electromagnetic adsorption. The combination tank (9) has a movable groove (13). The snap-fit ​​connectors (11) are slidably connected to the movable groove (13) in a sealed manner. The snap-fit ​​connectors (11) facing the combination tank (9) are rotatably connected to the rotating blades (12) through a built-in servo motor.

5. The apparatus for preparing soluble dietary fiber from pear pomace according to claim 4, characterized in that, Several rotating blades (12) are arranged in an array with the center of the tank (2) as the center. Inside the combined tank (9), a snap-fit ​​bracket (10) is installed via an electric push rod. The snap-fit ​​bracket (10) corresponds to the snap-fit ​​connector (11).

6. The apparatus for preparing soluble dietary fiber from pear pomace according to claim 1, characterized in that, The filtration mechanism includes a rotating filter plate (22), a lifting plate (19) with several filter holes (20) through it, the rotating filter plate (22) is an annular plate structure and an internal gear (23) is installed on its inner side, a drive gear (24) is installed inside the lifting plate (19), the drive gear (24) meshes with the internal gear (23), and the rotating filter plate (22) is located inside the lifting plate (19) and is sealed and rotatably connected to the lifting plate (19).

7. The apparatus for preparing soluble dietary fiber from pear pomace according to claim 6, characterized in that, The tank (2) has a groove at the bottom and an air filling pipe (8) is installed inside the groove. The air filling pipe (8) is spirally stored at the bottom of the tank (2). The top of the air filling pipe (8) is inserted into the lifting plate (19). Several jet frames (21) are installed on the upper side of the lifting plate (19). The jet frames (21) are connected to the air filling pipe (8) inside the lifting plate (19). The jet frames (21) are offset from the filter hole (20). The jet frames (21) are located above the rotating filter plate (22).

8. A process for preparing soluble dietary fiber from pear pomace, characterized in that, Includes the following steps: S1, Raw material pretreatment: Take fresh Korla fragrant pears, remove the core and pear stem, press to extract juice, collect the obtained fresh pear pulp, crush and mix it, freeze and store for later use. S2, Enzymatic hydrolysis reaction: Take the fresh pear residue obtained in step S1, add distilled water and adjust the pH, and add a compound enzyme preparation at the same time. The mixture is then enzymatically hydrolyzed at a constant temperature. The compound enzyme preparation consists of the following four enzymes: xylanase, hemicellulase, pectinase and peak α-amylase. S3, Enzyme Inactivation: After the enzymatic hydrolysis is completed, the reaction system is kept in a high-temperature constant temperature environment to inactivate the enzyme. S4, Solid-liquid separation: The enzyme-inactivated material is filtered and separated, and the filter residue and filtrate are collected separately; the filter residue is dried under vacuum at a constant temperature to constant weight to obtain insoluble dietary fiber; S5, alcohol precipitation: Add anhydrous ethanol to the filtrate obtained in step S4, heat at a constant temperature, and then let stand overnight to allow the soluble dietary fiber to precipitate fully. S6, Drying: The precipitate obtained in step S5 is vacuum filtered, the filter cake is collected, vacuum dried to constant weight, and then pulverized to obtain pear pomace soluble dietary fiber. S7, Blank Correction: Simultaneously conduct a blank control experiment without pear pomace, following steps S2 to S6. The resulting mass is used to correct the final product yield.

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