Granulator for food processing

Abstract

The invention relates to the technical field of food granulation, in particular to a granulator for food processing, which comprises a material placing barrel mounted on the top surface of a processing table, the inner wall of the lower half part of the material placing barrel is adaptively provided with a granulation part and a discharge disc in a matched manner, and the granulation part and the discharge disc are arranged at an interval and are coaxially connected through a transmission shaft in a penetrating manner; a material pressing group is transversely arranged in the upper half part of the material placing barrel and comprises a pair of compression rollers suspended above the top surface of the granulating piece, a positioning sleeve coaxially sleeved with the compression rollers, a positioning pipe positioned and inserted with the side wall of the material placing barrel, and a piezoelectric transducer sleeved in a central hole of the compression roller. The tungsten carbide substrate layer and the nano-composite functional layer are constructed on the surface of the compression roller to form the low surface energy characteristic, the asymmetric spiral grooves are engraved in the surface through laser, an air film blocking layer is formed, the sugar contact area is reduced, low-adhesion operation of the contact surface of the compression roller is achieved, and the anti-adhesion effect is achieved; cooling liquid is introduced through the cooling pipe to reduce the temperature in the material containing barrel, and the constant temperature of the extrusion area of the pressing roller is maintained to restrain sugar melting.

Description

Technical Field

[0001] The invention relates to the technical field of food granulation, in particular to a granulator for food processing. Background Art

[0002] Pellet mills are widely used in the pharmaceutical, chemical, and food industries. They are mainly composed of feeding, pelletizing, and transmission. Pellet mills can be divided into feed pellet mills and biomass energy pellet mills.

[0003] Application number CN202411896101.1 discloses an efficient high-temperature mixing granulation device for traditional Chinese medicine and a granulation method thereof, which belongs to the technical field of granulation equipment, and includes a granulator main body, the granulator main body is connected to a screen, the outside of the screen is equipped with a knife holder through multiple supporting feet, the inner wall of the knife holder is fixedly connected with four groups of mounting frames, each group of the mounting frames is rotatably connected to a second support rod and a first support rod, the outside of the first support rod is fixedly connected to a first connecting cylinder, and when the first scraper continuously rotates, the material outside the screen can be continuously scraped off, and continuous scraping work can be realized. At the same time, during the continuous scraping process, the second support rod will drive the second connecting cylinder and the second scraper to rotate. In the granulation method, particles are formed in advance through the mesh, and the particles are scraped off by the scraper, and the presence of residues is reduced during scraping.

[0004] The aforementioned granulation equipment primarily relies on mechanical scrapers to passively clean the screen from stuck materials. This has two major drawbacks: the scrapers can only remove already stuck materials and cannot prevent the hot melt adhesion of high-sugar materials during the extrusion process, effectively treating the symptoms rather than the root cause; and the friction between the metal scrapers and the screen generates particles that do not meet food-grade hygiene requirements and pose a risk of secondary contamination. This is particularly true for materials with high sugar content, as conventional equipment requires downtime for cleaning of sticking rollers, resulting in efficiency losses. Therefore, a granulation technology that addresses the root cause of adhesion is urgently needed. Summary of the Invention

[0005] In order to overcome the defects in the prior art, the purpose of the present invention is to provide a granulator for food processing, which fundamentally solves the problem of high-sugar materials sticking to the roller through the synergistic effect of a triple active anti-sticking system of roller coating, ultrasonic vibration and cooling to inhibit melting.

[0006] To achieve the above-mentioned object, the present invention provides a granulator for food processing, comprising a feeding barrel mounted on the top surface of a processing table, wherein the inner wall of the lower half of the feeding barrel is adapted to be equipped with a granulating member and a discharging tray, wherein the granulating member and the discharging tray are spaced apart and coaxially connected via a transmission shaft, wherein a motor is mounted behind the processing table and drives the transmission shaft to rotate via a transmission box, thereby driving the granulating member and the discharging tray to rotate synchronously; a discharge port is formed on the bottom front side wall of the feeding barrel; A pressing group is placed horizontally in the upper half of the material placement barrel, and the pressing group includes a pair of pressing rollers suspended above the top surface of the granulating member, a positioning sleeve coaxially sleeved with the pressing rollers, a positioning tube positioned and inserted into the side wall of the material placement barrel, and a piezoelectric transducer sleeved in the center hole of the pressing roller; the positioning sleeve is sleeved with the inner end of the positioning tube, and a positioning rod for squeezing the positioning tube is provided on the outside of the material placement barrel; a cooling pipe is provided on the outer wall of the material placement barrel and in the middle, for passing cooling liquid to reduce the temperature of the pressing roller.

[0007] The above-mentioned setting is intended to fundamentally solve the problem of high-sugar materials melting during extrusion and adhering to the mechanical structure. First, the surfaces of the pressing rollers and granulating parts that contact the materials are modified to produce low surface energy characteristics to inhibit sugar adhesion. Then, the composite functional layer forms an air film barrier layer and reduces the contact area. The dual effects achieve a lasting anti-sticking effect. Then, the environment of the extruded material is changed to a constant temperature, thereby suppressing the heat generated by the extrusion of the material. The material is passively rolled by positioning the pressing roller in order to install a piezoelectric transducer inside it to generate ultrasonic waves to prevent the material from adhering and make it easy to clean. Through the three-level active control of "anti-sticking-suppression-cleaning", the efficiency of granulating high-sugar materials is improved and the cost is reduced.

[0008] As a further improvement of the present technical solution, the granulation piece is a round block structure and its top surface is covered with a plurality of discharge holes. A material introduction slope is provided at the edge of the top surface of the granulation piece. The surface of the granulation piece is coated with a tungsten carbide wear-resistant base layer with a thickness of 0.2-0.5 mm and a polyetheretherketone-fluoropolymer nanocomposite functional layer.

[0009] As a further improvement of the present technical solution, the top surface of the discharge tray is slidably connected to a material-shifting piece, the material-shifting piece is fixedly connected to the side wall of the material-placing barrel, and a material guide plate is fixedly connected to the outside of the discharge port of the material-placing barrel.

[0010] As a further improvement of the present technical solution, the surface of the pressure roller is coated with a tungsten carbide wear-resistant base layer with a thickness of 0.2-0.5 mm and a polyetheretherketone-fluoropolymer nanocomposite functional layer, in which the fluoropolymer accounts for 25%-35% by mass, and the surface is distributed with grooves with a depth of 10-30 μm and a width of 20-50 μm.

[0011] The above setting uses a tungsten carbide wear-resistant base layer to provide high-strength support to resist material extrusion and wear; the composite functional layer is used to inhibit sugar adhesion through its low surface energy characteristics, and the surface grooves are used to form an air film barrier layer and reduce the contact area. The dual effects achieve a long-lasting anti-stick effect.

[0012] As a further improvement of this technical solution, a connecting shaft is sleeved between the two piezoelectric transducers, the positioning sleeve is also sleeved and matched with the piezoelectric transducer, and a bearing is sleeved on the outer wall of the positioning sleeve, and the inner hole wall of the pressure roller is tightly sleeved with the outer ring of the bearing.

[0013] As a further improvement of the present technical solution, the positioning tube is threadedly connected to the positioning sleeve, a positioning head is provided at the outer end of the positioning tube, the positioning head is a polygonal prism structure, the outer wall of the material placing barrel is fixedly connected to an outer ring, the positioning rod is threadedly connected to the threaded hole provided on the top surface of the outer ring, and the bottom end of the positioning rod is in contact and extruded with the side plane of the positioning head.

[0014] These two settings are to enable the piezoelectric transducer to have an external power supply. Through a pair of positioning tubes, a pair of positioning sleeves and a connecting shaft, they act as coaxial supports, so that the wires of the piezoelectric transducer pass through the inner holes of the positioning sleeves and positioning tubes to pass through the external circuit and be powered on.

[0015] As a further improvement of the present technical solution, through holes are symmetrically opened on the middle side wall of the material placing barrel, and the positioning tube is adapted to be matched with the through holes.

[0016] As a further improvement of the present technical solution, the outer diameter of the bearing is larger than the outer diameter of the piezoelectric transducer, the outer wall of the connecting shaft is symmetrically sleeved with a sealing ring, and the sealing ring is rotatably sleeved with one end of the inner hole of the pressure roller, and the other end of the inner hole of the pressure roller is fixedly connected with a sealing cover, and the sealing cover is rotatably sleeved with the positioning tube.

[0017] As a further improvement of the present technical solution, the cooling pipe is spirally structured and sleeved on the outer wall of the material barrel. One end of the cooling pipe is connected to a liquid pump, and the suction end of the liquid pump is connected to a cooling box. The other end of the cooling pipe is connected to the condenser of the compressor, and a reflux pipe is connected between the compressor and the cooling box.

[0018] As a further improvement of the technical solution, the top end of the transmission shaft is threadedly connected to a ring seat, and the ring seat is located on the top surface of the granulating member and is tightly sleeved on the protective cover.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. This food processing granulator has low surface energy characteristics by constructing a tungsten carbide base layer and a nano-composite functional layer on the surface of the pressure roller. The surface is laser-engraved with asymmetric spiral grooves to form an air film barrier layer to reduce the contact area of ​​sugar, achieve low adhesion operation on the contact surface of the pressure roller, and achieve an anti-stick effect.

[0020] 2. This food processing granulator controls the piezoelectric transducer through ultrasonic and mechanical dynamic coupling to adjust the ultrasonic frequency in real time, thereby removing potential sticky residues.

[0021] 3. This food processing granulator reduces the internal temperature of the barrel by introducing coolant into the spiral cooling pipe, so that the pressing roller and granulating parts are in a cooling environment, maintaining a constant temperature in the extrusion area, and inhibiting the melting of sugar.

[0022] 4. This food processing granulator adopts modular quick-disassembly design for positioning tube and pressure roller, and adopts polygonal prism positioning head and threaded rod locking, which shortens the replacement time of pressure roller compared with traditional equipment and improves the cleaning efficiency of pressure roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art will select various possible shapes and proportional dimensions to implement the present invention according to the specific circumstances under the guidance of the present invention.

[0024] Figure 1 It is a schematic diagram of the overall assembly structure of the present invention; Figure 2 It is a schematic diagram of the partial assembly structure of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the internal assembly structure; Figure 4 This is a schematic diagram of the cooling box and compressor assembly structure of the present invention; Figure 5 This is a schematic diagram of the transmission shaft assembly structure of the present invention; Figure 6 It is a full cross-sectional view of the material placing barrel of the present invention; Figure 7 It is a schematic structural diagram of the granulation member of the present invention; Figure 8 This is a partial exploded view of the material pressing group of the present invention; Figure 9 This is a schematic diagram of the assembly structure of the positioning sleeve and the positioning tube of the present invention; The meaning of each number in the figure is: 100, processing table; 110, material placement barrel; 111, through hole; 120, motor; 121, transmission box; 130, material guide plate; 140, cooling box; 150, liquid pump; 151, cooling pipe; 160, compressor; 161, return pipe; 200, granulating element; 201, discharge hole; 202, material guide slope; 210, transmission shaft; 220, discharge tray; 230, material shifting piece; 240, protective cover; 300, pressing group; 310, pressing roller; 311, sealing cover; 320, positioning sleeve; 321, connecting shaft; 322, sealing ring; 330, positioning tube; 331, positioning head; 332, positioning rod; 340, piezoelectric transducer; 350, bearing. DETAILED DESCRIPTION

[0025] The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are for illustrative purposes only and are not to be construed as limiting the present invention in any way. Under the guidance of the present invention, any possible variations of the present invention conceived by skilled artisans should be considered within the scope of the present invention. The terms "mounted" and "connected" should be understood broadly, meaning direct connection as well as indirect connection through an intermediary.

[0026] The terms "central axis," "vertical," "horizontal," "front," "back," "up," "down," "left," "right," "top," "bottom," "inside," and "outside" used herein to indicate positions or location relationships are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, in the description of the present invention, "several" means two or more, unless otherwise specifically defined.

[0027] See also Figure 1-Figure 7 As shown, the present invention provides a granulator for food processing, including a feeding barrel 110 installed on the top surface of a processing table 100, and a granulating piece 200 and a discharge tray 220 are adapted to be provided on the inner wall of the lower half of the feeding barrel 110. The granulating piece 200 is a round block structure and its top surface is covered with a plurality of discharge holes 201. The granulating piece 200 and the discharge tray 220 are spaced apart and coaxially connected through a transmission shaft 210. A motor 120 is installed at the rear of the processing table 100, and drives the transmission shaft 210 to rotate through a transmission box 121. The transmission box 121 is driven by a worm gear and a worm, and transmits the driving force of the output shaft of the motor 120 to the transmission shaft 210. This is a prior art and will not be described in detail here; and then drives the granulating piece 200 and the discharge tray 220 to rotate synchronously; a discharge port is provided on the bottom front side wall of the feeding barrel 110 for discharging materials.

[0028] Furthermore, to reduce the amount of material adhering to the surface of the granulating element 200, a material guide ramp 202 is provided at the top edge of the granulating element 200, guiding the material to the discharge port 201 for extrusion and discharge. The surface of the granulating element 200 is coated with a wear-resistant tungsten carbide base layer with a thickness of 0.2-0.5 mm and a polyetheretherketone-fluoropolymer nanocomposite functional layer. This base layer provides high-strength support and resists material extrusion and wear. This composite functional layer inhibits sugar adhesion through its low surface energy properties. A ring seat is threadedly connected to the top of the transmission shaft 210. The ring seat is located on the top surface of the granulating element 200 and fits tightly against the protective cover 240. The ring seat compresses the granulating element 200, and the protective cover 240 provides protection, preventing material from accumulating in the gap between the transmission shaft 210 and the ring seat.

[0029] Furthermore, the top surface of the discharge tray 220 is slidably connected to a material-discharging piece 230, and the material-discharging piece 230 is fixedly connected to the side wall of the material-placing barrel 110. The length of the material-discharging piece 230 is greater than the radius of the discharge tray 220. As the discharge tray 220 rotates, the material encounters the stationary material-discharging piece 230 and is driven to the discharge port for discharge; a material guide plate 130 is fixedly connected to the outside of the discharge port of the material-placing barrel 110 for guiding the discharge direction of the material so that it can be collected smoothly.

[0030] Specifically, since high-sugar materials are easily melted by heat during extrusion and discharge, a cooling pipe 151 is provided on the outer wall of the barrel 110 and located in the middle. This is used to allow coolant to flow in to cool the interior of the barrel 110, thereby preventing the sugar-containing materials from melting and becoming sticky during granulation. The cooling pipe 151 is spirally sleeved on the outer wall of the barrel 110. One end of the cooling pipe 151 is connected to a liquid pump 150, and the suction end of the liquid pump 150 is connected to a cooling box 140. The other end of the cooling pipe 151 is connected to the condenser of the compressor 160. A return pipe 161 is connected between the compressor 160 and the cooling box 140. A temperature sensor is embedded in the inner wall of the barrel 110 to monitor its internal temperature and trigger the liquid pump 150 to pump out coolant at a certain speed through a feedback control system to control the cooling effect.

[0031] like Figure 8 and Figure 9 As shown, in order to further prevent material adhesion and facilitate cleaning, a pressing group 300 is placed horizontally in the upper half of the feeding barrel 110, and the rotating granulating member 200 drives the material and the pressing group 300 to be extruded and granulated; the pressing group 300 includes a pair of pressing rollers 310 suspended above the top surface of the granulating member 200, a positioning sleeve 320 coaxially sleeved with the pressing rollers 310, a positioning tube 330 positioned and plugged into the side wall of the feeding barrel 110, and a piezoelectric transducer 340 sleeved in the center hole of the pressing roller 310 for generating ultrasonic waves to assist the pressing roller 310 in preventing the material from sticking; The ultrasonic operating frequency f (Hz) of the piezoelectric transducer 340 and the speed n (rpm) of the pressing roller 310 satisfy: f = (n ÷ 60) × k; k is the wavelength-speed matching coefficient, ranging from 1150 to 1250; "60" is the unit conversion factor, converting the speed from rpm to rps (revolutions per second). The roller 310 is driven by the granulating element 200 and the material to generate a speed n. The speed n is calculated by converting n / 60 to obtain the rotational frequency, which is multiplied by the matching factor k to obtain the output ultrasonic frequency f. This ultrasonic wave helps the roller 310 prevent material from sticking and clearing gaps.

[0032] Furthermore, the positioning sleeve 320 is sleeved and matched with the inner end of the positioning tube 330, and a positioning rod 332 for squeezing the positioning tube 330 is provided on the outside of the material placement barrel 110, which is used to position the pressure roller 310 to prevent the pressure roller 310 from sliding axially, so that it can stably press the material on the granulation part 200; wherein cooling liquid is passed into the cooling tube 151 to reduce the temperature of the pressure roller 310, so as to prevent the pressure roller 310 from rubbing against the material and continuously generating high heat, causing the sugar-containing material to melt and form a sticky state.

[0033] Specifically, the surface of the pressing roller 310 is coated with a tungsten carbide wear-resistant base layer with a thickness of 0.2-0.5mm, and a polyetheretherketone-fluoropolymer nano-composite functional layer. This base layer provides high-strength support to resist material extrusion wear; the fluoropolymer mass accounts for 25%-35%, and the fluoropolymer is polytetrafluoroethylene particles with a particle size of 50-100nm, and is formed by gradient plasma sintering, and the sintering temperature is stepped down from 400℃ to 280℃; the surface of this functional layer is distributed with grooves with a depth of 10-30μm and a width of 20-50μm; this groove is distributed in an asymmetric spiral gradient, and the spiral angle changes linearly from 15° to 45° along the axial direction of the pressing roller 310; this composite functional layer inhibits sugar adhesion through its low surface energy characteristics, and the surface grooves are used to form an air film barrier layer and reduce the contact area. The dual effects achieve a long-lasting anti-sticking effect.

[0034] Furthermore, a connecting shaft 321 is sleeved between the two piezoelectric transducers 340, and the positioning sleeve 320 is also sleeved and matched with the piezoelectric transducer 340, and a bearing 350 is sleeved on the outer wall of the positioning sleeve 320. The inner hole wall of the pressure roller 310 is tightly sleeved with the outer ring of the bearing 350, so that the pressure roller 310 can rotate freely. A pair of positioning tubes 330, a pair of positioning sleeves 320 and the connecting shaft 321 jointly play a coaxial support role, so that the wires of the piezoelectric transducer 340 pass through the inner holes of the positioning sleeve 320 and the positioning tube 330 to pass through the external circuit and energize the work.

[0035] A through hole 111 is symmetrically provided on the middle side wall of the material placing barrel 110, and the positioning tube 330 is adapted to fit the through hole 111; the positioning tube 330 is threadedly sleeved with the positioning sleeve 320, and a positioning head 331 is provided at the outer end of the positioning tube 330, and the positioning head 331 is a polygonal prism structure. The outer wall of the material placing barrel 110 is fixedly connected to an outer ring, and the positioning rod 332 is threadedly connected to the threaded hole provided on the top surface of the outer ring, and the bottom end of the positioning rod 332 is in contact and extrusion with the side plane of the positioning head 331, so that the positioning tube 330 is not loosened due to the vibration of the rotation of the granulating member 200.

[0036] Among them, the outer diameter of the bearing 350 is larger than the outer diameter of the piezoelectric transducer 340 to avoid being touched by the rotation of the pressure roller 310; the outer wall of the connecting shaft 321 is symmetrically provided with a sealing ring 322, and the sealing ring 322 is rotatably sleeved with one end of the inner hole of the pressure roller 310, and the other end of the inner hole of the pressure roller 310 is fixedly connected with a sealing cover 311, and the sealing cover 311 is rotatably sleeved with the positioning tube 330 to prevent materials from entering the two ends of the pressure roller 310, which is convenient for subsequent cleaning.

[0037] When the food processing granulator of the present invention is in use, the material is poured into the upper half of the feeding barrel 110, and then the motor 120 is started to drive the transmission shaft 210 to rotate, driving the granulating element 200 and the discharge tray 220 to rotate synchronously. The material and the pressure roller 310 generate relative motion and are squeezed into the discharge hole to form granules. Due to centrifugal force, the material falls onto the discharge tray 220 and rotates, and then encounters the material-prying piece 230 and is driven out of the discharge port.

[0038] During this process, a temperature sensor is embedded in the inner wall of the material barrel 110 to monitor its internal temperature, and the feedback control system triggers the liquid pump 150 to pump out coolant through the cooling pipe 151 around the outer wall of the material barrel 110 to produce a lasting cooling effect, so that the heat inside the material barrel 110 is cooled; at the same time, the pressure roller 310 is driven by the granulating member 200 and the material to form a rotation speed n, and the unit conversion n / 60 is used to obtain the rotation frequency multiplied by the matching coefficient k to obtain the output ultrasonic frequency f, and ultrasonic waves are generated to assist the pressure roller 310 in not sticking to the material. The surface coating of the pressure roller 310 suppresses sugar adhesion through its low surface energy characteristics, thereby achieving multiple suppression of the melting of high-sugar materials caused by extrusion molding, fundamentally solving the problem of material extrusion discharge and subsequent inconvenience in cleaning.

[0039] It should be noted that the fixed connection and fixed arrangement of the present invention are achieved using conventional fixing means such as bolt connections or welding. The above embodiments are merely illustrative of the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the content of the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit and essence of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A granulator for food processing, comprising a material placement barrel mounted on the top surface of a processing table, characterized in that: The inner wall of the lower half of the material placement barrel is adapted to be equipped with a granulating piece and a discharging tray. The granulating piece and the discharging tray are spaced apart and coaxially connected through a transmission shaft. A motor is installed at the rear of the processing table, and the transmission shaft is driven to rotate through a transmission box, thereby driving the granulating piece and the discharging tray to rotate synchronously. A discharge port is opened on the bottom front side wall of the material placement barrel. A pressing group is placed horizontally in the upper half of the material placement barrel, and the pressing group includes a pair of pressing rollers suspended above the top surface of the granulating member, a positioning sleeve coaxially sleeved with the pressing rollers, a positioning tube positioned and inserted into the side wall of the material placement barrel, and a piezoelectric transducer sleeved in the center hole of the pressing roller; the positioning sleeve is sleeved with the inner end of the positioning tube, and a positioning rod for squeezing the positioning tube is provided on the outside of the material placement barrel; a cooling pipe is provided on the outer wall of the material placement barrel and in the middle, for passing cooling liquid to reduce the temperature of the pressing roller.

2. The food processing granulator according to claim 1, characterized in that: The granulation piece is a round block structure and its top surface is covered with a plurality of discharge holes. A material introduction slope is provided at the edge of the top surface of the granulation piece. The surface of the granulation piece is coated with a tungsten carbide wear-resistant base layer with a thickness of 0.2-0.5mm and a polyetheretherketone-fluoropolymer nanocomposite functional layer.

3. The food processing granulator according to claim 2, characterized in that: The top surface of the discharge tray is slidably connected with a material-shifting piece, the material-shifting piece is fixedly connected to the side wall of the material-placing barrel, and the discharge port of the material-placing barrel is fixedly connected with a material guide plate.

4. The food processing granulator according to claim 3, characterized in that: The surface of the pressure roller is coated with a tungsten carbide wear-resistant base layer with a thickness of 0.2-0.5 mm and a polyetheretherketone-fluoropolymer nanocomposite functional layer, in which the fluoropolymer accounts for 25%-35% by mass, and the surface is distributed with grooves with a depth of 10-30 μm and a width of 20-50 μm.

5. The food processing granulator according to claim 4, characterized in that: A connecting shaft is sleeved between the two piezoelectric transducers, the positioning sleeve is also sleeved and matched with the piezoelectric transducer, and a bearing is sleeved on the outer wall of the positioning sleeve, and the inner hole wall of the pressure roller is tightly sleeved with the outer ring of the bearing.

6. The food processing granulator according to claim 5, characterized in that: The positioning tube is threadedly connected to the positioning sleeve, and a positioning head is provided at the outer end of the positioning tube. The positioning head is a polygonal prism structure. The outer wall of the material placing barrel is fixedly connected to an outer ring. The positioning rod is threadedly connected to the threaded hole provided on the top surface of the outer ring, and the bottom end of the positioning rod is in contact and extruded with the side plane of the positioning head.

7. The food processing granulator according to claim 6, characterized in that: The middle side wall of the material placing barrel is symmetrically provided with through holes, and the positioning tube is adapted to be matched with the through holes.

8. The food processing granulator according to claim 7, characterized in that: The outer diameter of the bearing is larger than the outer diameter of the piezoelectric transducer. The outer wall of the connecting shaft is symmetrically sleeved with a sealing ring, and the sealing ring is rotatably sleeved with one end of the inner hole of the pressure roller. The other end of the inner hole of the pressure roller is fixedly connected with a sealing cover, and the sealing cover is rotatably sleeved with the positioning tube.

9. The food processing granulator according to claim 8, characterized in that: The cooling pipe is spirally structured and sleeved on the outer wall of the material barrel. One end of the cooling pipe is connected to a liquid pump, and the suction end of the liquid pump is connected to a cooling box. The other end of the cooling pipe is connected to the condenser of the compressor, and a reflux pipe is connected between the compressor and the cooling box.

10. The food processing granulator according to claim 9, characterized in that: The top end of the transmission shaft is threadedly connected with a ring seat, and the ring seat is located on the top surface of the granulating component and is tightly sleeved on the protective cover.

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