Stirring device for cake production

Abstract

A stirring device for cake production comprises a stirring barrel, a main stirring shaft, a differential scraping mechanism and a driving mechanism. A feeding port is formed in the top of the stirring barrel, a water inlet is formed in one side of the upper end of the stirring barrel, a conical surface is arranged at the bottom of the stirring barrel, a discharging port is formed in the bottom of the stirring barrel, the main stirring shaft is arranged in the center of the stirring barrel, and the upper end of the main stirring shaft is connected with the driving mechanism. The differential scraping mechanism comprises a central rotating shaft which is coaxially arranged outside the main stirring shaft in a sleeving manner, the central rotating shaft is connected with the main stirring shaft through a planetary gear mechanism, and a telescopic cleaning nozzle assembly is arranged at the upper end of the inner wall of the stirring barrel; by means of the innovative differential rotating scraping mechanism, synchronous self-cleaning of the inner wall of the stirring barrel and the surfaces of the stirring blades in the stirring process is achieved, the stirring uniformity and the production efficiency are improved, the manual maintenance cost is reduced, and the food sanitation requirement is met.

Description

A mixing device for cake production Technical Field

[0001] This utility model relates to the field of food processing equipment technology, specifically to a mixing device for cake production with differential speed self-cleaning function. Background Technology

[0002] In cake production, the performance of the mixing device directly affects the quality of the batter. Traditional mixing devices have several shortcomings: First, material easily adheres to the inner wall of the mixing bowl and the surface of the mixing blades, leading to uneven mixing and requiring frequent shutdowns for manual cleaning, thus affecting production efficiency; second, manual cleaning is difficult to thoroughly remove material from hard-to-reach areas, easily leading to bacterial growth and failing to meet food hygiene standards; third, the scraping structure of some mixing devices rotates synchronously with the mixing blades, making it impossible to effectively clean material from the surface of the mixing blades. While some existing mixing devices have scraping functions, there is still room for improvement in their structural design and cleaning effectiveness. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a mixing device for cake production. Through an innovative differential rotation scraping mechanism, it achieves synchronous self-cleaning of the inner wall of the mixing drum and the surface of the mixing paddle during the mixing process, thereby improving mixing uniformity and production efficiency, reducing manual maintenance costs, and meeting food hygiene requirements.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: A mixing device for cake production includes a mixing tank, a main mixing shaft, a differential scraping mechanism, and a drive mechanism; the mixing tank has a feed inlet at the top, a water inlet on one side of the upper end, and a conical bottom with a discharge outlet, where a sealing valve is installed; the main mixing shaft is vertically positioned at the center of the mixing tank, its upper end passing through the top of the mixing tank and connected to the drive mechanism; three sets of mixing blades are arranged sequentially from top to bottom on the main mixing shaft, the three sets of mixing blades being inclined blade-shaped upper mixing blades, lower mixing blades, and upper mixing blades. The device features a spiral-shaped middle stirring blade and a cross-shaped lower stirring blade. The differential scraping mechanism includes a central rotating shaft coaxially sleeved outside the main stirring shaft. Two sets of deep groove ball bearings and double-lip skeleton oil seals are installed between the central rotating shaft and the main stirring shaft. The central rotating shaft is connected to the main stirring shaft through a planetary gear mechanism. The planetary gear mechanism includes a sun gear fixed to the main stirring shaft, a planet carrier fixed to the top of the mixing tank by a bracket, planet gears mounted on the planet carrier, and a gear ring fixed to the central rotating shaft. The sun gear drives the planet gears to rotate the gear ring, forming a transmission ratio i of 0.6-0.8.

[0005] The top of the central rotating shaft is symmetrically provided with radially extending scraper arms, which are divided into a first scraper arm and a second scraper arm. The first scraper arm and the second scraper arm are inverted L-shaped structures. The outer side of the end of the first scraper arm is provided with a flexible scraper that fits against the inner wall of the mixing tank, and the inner side of the second scraper arm is provided with a contour scraper that matches the surface of the mixing blade. The driving mechanism includes a variable frequency speed control motor and a reducer.

[0006] A retractable cleaning nozzle assembly is provided on the upper part of the inner wall of the mixing tank 1. The cleaning nozzle assembly includes 3-6 sets of nozzle units evenly distributed along the circumference. Each set of nozzle units includes a fixed base, an electric actuator, and a rotating nozzle. The fixed base is embedded in the wall of the mixing tank. One end of the electric actuator is hinged to the fixed base, and the other end is connected to the rotating nozzle. The rotating nozzle has a conical structure with spray holes of 0.5-1.0 mm in diameter evenly distributed on its surface. The spray holes are arranged in a spiral shape with a spiral angle of 30-45°. The rotating nozzle is connected to the water inlet through a water supply pipe.

[0007] Furthermore, the central rotating shaft is a 304 stainless steel tube with a wall thickness of 6-10mm, and its inner diameter is 10-20mm larger than the outer diameter of the main stirring shaft. The bearing clearance of the deep groove ball bearing is controlled at 0.03-0.05mm.

[0008] Furthermore, the horizontal arm length of the first scraper arm and the second scraper arm is 0.8-0.9 times the radius of the mixing tank, and the vertical arm length extends vertically downward from the end of the horizontal arm length, with an extension length of 0.3-0.4 times the height of the mixing tank, and is inclined at 3-5° towards the center of the mixing tank. The bottom of the vertical arm length is provided with an arc-shaped flexible scraper that matches the radius of curvature of the conical surface at the bottom of the mixing tank.

[0009] Furthermore, the flexible scraper and the contour scraper are made of silicone or polyurethane material with a Shore hardness of 50-70A. The contour scraper is connected to the second scraper arm via an elastic hinge, which provides a contact pressure of 0.1-0.3 N / cm².

[0010] Furthermore, the vertical arm section of the scraper is also provided with guide vanes distributed in a spiral shape, and the spiral angle of the guide vanes is 25-35°.

[0011] Furthermore, the rated power of the variable frequency speed control motor is 3-7.5kW, the speed adjustment range is 30-120rpm, and the reduction ratio of the reducer is 1:15-1:30.

[0012] Work process

[0013] Mixing Stage: Material is added to mixing tank 1 through inlet 1.1. The variable frequency speed control motor 2 is started, and the main mixing shaft 3 rotates clockwise, driving the three-layer mixing blades to mix the material. Simultaneously, the planetary gear mechanism 8 drives the central rotating shaft 5 to rotate counterclockwise, and the scraper arm 6 rotates in the opposite direction at 75% of the main mixing shaft 3's speed. The first scraper arm cleans the tank wall, and the second scraper arm cleans the surface of the mixing blades. Discharge Stage: The discharge valve is opened, and the conical tank bottom design ensures complete material discharge.

[0014] Cleaning modes:

[0015] Preparation stage: After the mixing is completed and the material is unloaded, the control system issues a cleaning command, the electric actuator extends, and the rotating nozzle enters the working position, 50mm away from the barrel wall.

[0016] Preliminary washing stage: A centrifugal pump delivers 50℃ clean water at a pressure of 0.6MPa. The rotating nozzle rotates at 100rpm to initially rinse the inner wall of the mixing tank and the mixing blades for 1 minute. The spray angle of the rotating nozzle is 120°. The four sets of nozzle units work together to cover the entire inner wall of the mixing tank and the surface of all the mixing blades, ensuring thorough cleaning without any blind spots.

[0017] Fine washing stage: Switch to 2% food-grade alkaline solution at 80℃, pressure 0.7MPa, wash for 2 minutes to dissolve stubborn grease and protein.

[0018] Rinsing stage: Switch to 80℃ clean water, pressure 0.8MPa, rinse for 1.5 minutes to ensure no detergent residue remains.

[0019] The beneficial effects of this utility model are: synchronous self-cleaning function: the planetary gear mechanism realizes the differential reverse rotation of the central rotating shaft and the main stirring shaft, which drives the scraper to clean the barrel wall and the surface of the stirring blades synchronously during the stirring process, reducing the material residue rate by more than 90%, eliminating the need for manual cleaning by stopping the machine, and significantly improving production efficiency.

[0020] High-efficiency mixing performance: Multi-layer mixing blades combined with guide vanes and the micro-disturbance action of scraper arms enhance the material mixing effect, shorten the mixing time by 20-30%, and improve the mixing uniformity by more than 30%.

[0021] Compact and reliable structure: It adopts a coaxial nested planetary gear mechanism, which does not require an additional power source. It has a compact structure and high transmission efficiency. The deep groove ball bearing and double lip skeleton oil seal ensure good sealing and stability, extending the service life of the equipment. Intelligent control: Equipped with a variable frequency speed control motor, it can adjust the stirring speed and scraper differential ratio according to the material characteristics, making it highly adaptable. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] Figure 1 is a schematic diagram of the overall assembly structure;

[0024] In the diagram: 1. Mixing tank, 1.1. Inlet, 1.2. Outlet, 1.3. Water inlet, 2. Variable frequency speed control motor, 3. Main mixing shaft, 4. Mixing blade, 5. Central rotating shaft, 6. Scraper arm, 7. Flexible scraper, 7.1. Guide vane, 8. Planetary gear mechanism, 9. Contouring scraper, 10. Electric push rod, 11. Rotary nozzle. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0026] A mixing device for cake production includes a mixing tank 1, a main mixing shaft 3, a differential scraping mechanism, and a drive mechanism; the mixing tank 1 is made of SUS304 stainless steel with a wall thickness of 3-5mm and an inner diameter of 500-1000mm depending on the production scale; the top of the mixing tank 1 is provided with a feed inlet 1.1 with a diameter of 80-150mm, a water inlet 1.3 is provided on one side of the upper end of the mixing tank 1, the bottom is designed with a 45-60° conical structure, and the discharge port 1.2 has a diameter of 80-150mm and is equipped with a pneumatic ball valve;

[0027] The main stirring shaft 3 has a diameter of 40-80mm, is made of 45# steel, and has a chrome-plated surface. The main stirring shaft 3 is vertically positioned at the center of the mixing tank 1, with its upper end passing through the top of the mixing tank 1 and connecting to the drive mechanism. Three sets of stirring blades 4 are arranged on the main stirring shaft 3 from top to bottom. The three sets of stirring blades 4 are an inclined blade-shaped upper stirring blade, a spiral-shaped middle stirring blade, and a cross-shaped lower stirring blade. The upper stirring blade consists of 4-6 blades with an inclination angle of 25-35° and is used for radial mixing. The middle stirring blade has a spiral diameter of 400-850mm, a pitch of 100-200mm, and a spiral angle of 40-50° and is used for lifting materials. The lower stirring blade has a blade width of 60-150mm and is used for turning over materials at the bottom.

[0028] The differential scraping mechanism includes a central rotating shaft 5 coaxially sleeved outside the main stirring shaft 3. The central rotating shaft 5 is made of 304 stainless steel tube with a wall thickness of 8mm and an inner diameter 15mm larger than the outer diameter of the main stirring shaft. Two sets of 6200 series deep groove ball bearings are installed between them with a bearing clearance of 0.04mm and a double-lip skeleton oil seal is provided. The central rotating shaft 5 is connected to the main stirring shaft 3 through a planetary gear mechanism 8. The planetary gear mechanism 8 includes a sun gear fixed to the main stirring shaft 3 with a module of 2.5 and 24 teeth; a planet carrier fixed to the top of the mixing tank 1 by a bracket; planetary gears mounted on the planet carrier with a module of 2.5 and 18 teeth, and 3 in number; and a gear ring fixed to the central rotating shaft 5 with a module of 2.5 and 60 teeth. When the main stirring shaft 3 rotates clockwise, the gear ring drives the central rotating shaft 5 to rotate counterclockwise, and the sun gear drives the planetary gears to drive the gear ring to rotate, forming a transmission ratio i of 0.6-0.8.

[0029] The central rotating shaft 5 is symmetrically provided with radially extending scraper arms 6 at its top. The scraper arms 6 are divided into a first scraper arm and a second scraper arm, which are inverted L-shaped structures. The outer side of the end of the first scraper arm is provided with a flexible scraper 7 that fits against the inner wall of the mixing tank 1, and the inner side of the second scraper arm is provided with a contour scraper 9 that matches the surface of the stirring blade 4. The driving mechanism includes a variable frequency speed control motor 2 and a reducer. The horizontal arm length of the first and second scraper arms is 0.85 times the radius of the mixing tank 1, and the vertical arm length extends downward to 0.35 times the height of the tank. The vertical arm length is provided with a spiral guide vane 7.1 with a spiral angle of 30° to enhance material circulation.

[0030] The first scraper arm's vertical section is inclined at 4° towards the center. Flexible scrapers 7 are evenly distributed from top to bottom on the outer side of the vertical section, with gaps between adjacent flexible scrapers 7. An arc-shaped flexible scraper 7 is located at the bottom of the vertical section, conforming to the curvature of the conical surface of the barrel bottom. The second scraper arm's inner side is equipped with a contour scraper 9, which includes an inclined scraper corresponding to the upper stirring blade, a spiral scraper corresponding to the middle stirring blade, and a horizontal scraper corresponding to the lower stirring blade. The contour scraper 9 is made of silicone material with a Shore hardness of 60A and is connected to the scraper arm via an elastic hinge, providing a contact pressure of 0.2 N / cm².

[0031] Four sets of nozzle units are evenly distributed along the circumference of the inner wall of the mixing tank 1, with each set of nozzle units corresponding to a quadrant area. The cleaning nozzle assembly includes 3-6 sets of nozzle units evenly distributed along the circumference. Each set of nozzle units includes a fixed base, an electric actuator 10, and a rotating nozzle 11. The fixed base is embedded in the wall of the mixing tank 1. One end of the electric actuator 10 is hinged to the fixed base, and the other end is connected to the rotating nozzle 11. The rotating nozzle 11 has a conical structure with a cone angle of 60°, a bottom diameter of 40mm, and a height of 30mm. Fifty φ0.7mm spray holes are evenly distributed on the surface, arranged in a spiral shape with a spiral angle of 38° to ensure that the cleaning liquid covers the entire inner wall of the mixing tank 1 and the mixing blades 3. The rotating nozzle 11 is connected to the water inlet 1.3 through a water supply pipe. The water inlet 1.3 is connected to an external cleaning liquid supply system. During cleaning, 80℃ hot water is sprayed at a pressure of 0.4MPa to achieve all-round cleaning of the tank wall and the mixing blades 3.

[0032] The variable frequency speed control motor 2 is a 5.5kW variable frequency motor with a rated speed of 1450rpm and a speed range of 30-120rpm. The reducer has a reduction ratio of 1:25 and an output torque of ≥800N / m. The main stirring shaft 3 has a speed range of 12-48rpm, which can be adjusted according to the characteristics of different materials.

[0033] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A mixing device for cake production, characterized in that, The system includes a mixing tank (1), a main mixing shaft (3), a differential scraping mechanism, and a drive mechanism. The mixing tank (1) has a feed inlet (1.1) at its top, a water inlet (1.3) on one side of its upper end, and a conical bottom with a discharge outlet (1.2). A sealing valve is installed at the discharge outlet (1.2). The main mixing shaft (3) is vertically positioned at the center of the mixing tank (1), with its upper end passing through the top of the mixing tank (1) and connected to the drive mechanism. Three sets of mixing blades (4) are arranged sequentially from top to bottom on the main mixing shaft (3). The three sets of mixing blades (4) are respectively... The upper stirring blade is inclined, the middle stirring blade is spiral, and the lower stirring blade is cross-shaped. The differential scraping mechanism includes a central rotating shaft (5) coaxially sleeved outside the main stirring shaft (3). Two sets of deep groove ball bearings and double-lip skeleton oil seals are provided between the central rotating shaft (5) and the main stirring shaft (3). The central rotating shaft (5) is connected to the main stirring shaft (3) through a planetary gear mechanism (8). The planetary gear mechanism (8) includes a sun gear fixed to the main stirring shaft (3), a planet carrier fixed to the top of the mixing tank (1) by a bracket, planet gears mounted on the planet carrier, and a central rotating shaft (5). A fixedly connected gear ring, with the sun gear driving the planet gears to rotate the gear ring, forming a transmission ratio i of 0.6-0.8; the top of the central rotating shaft (5) is symmetrically provided with radially extending scraper arms (6), the scraper arms (6) are divided into a first scraper arm and a second scraper arm, the first scraper arm and the second scraper arm are inverted L-shaped structures, the outer side of the end of the first scraper arm is provided with a flexible scraper (7) that fits against the inner wall of the mixing tank (1), and the inner side of the second scraper arm is provided with a contour scraper (9) that matches the surface of the stirring blade (4); the driving mechanism includes a variable frequency speed control motor (2) and a reducer; the upper end of the inner wall of the mixing tank (1) is provided with an extendable The cleaning nozzle assembly includes 3-6 sets of nozzle units evenly distributed along the circumference. Each set of nozzle units includes a fixed base, an electric actuator (10), and a rotating nozzle (11). The fixed base is embedded in the wall of the mixing tank. One end of the electric actuator (10) is hinged to the fixed base, and the other end is connected to the rotating nozzle (11). The rotating nozzle (11) has a conical structure and spray holes with a diameter of 0.5-1.0 mm are evenly distributed on its surface. The spray holes are arranged in a spiral shape with a spiral angle of 30-45°. The rotating nozzle (11) is connected to the water inlet (1.3) through a water supply pipe.

2. The mixing device for cake production according to claim 1, characterized in that, The central rotating shaft (5) is a 304 stainless steel pipe with a wall thickness of 6-10mm. Its inner diameter is 10-20mm larger than the outer diameter of the main stirring shaft (3). The bearing clearance of the deep groove ball bearing is controlled at 0.03-0.05mm.

3. The mixing device for cake production according to claim 1, characterized in that, The horizontal arm length of the first scraper arm and the second scraper arm is 0.8-0.9 times the radius of the mixing tank. The vertical arm section extends vertically downward from the end of the horizontal arm section, with an extension length of 0.3-0.4 times the height of the mixing tank (1), and is inclined at 3-5° towards the center of the mixing tank (1). The bottom of the vertical arm section is provided with an arc-shaped flexible scraper (7) that is consistent with the radius of curvature of the conical surface at the bottom of the mixing tank (1).

4. The mixing device for cake production according to claim 1, characterized in that, The flexible scraper (7) and the contour scraper (9) are made of silicone or polyurethane material with a Shore hardness of 50-70A. The contour scraper (9) is connected to the second scraper arm by an elastic hinge, which provides a contact pressure of 0.1-0.3 N / cm².

5. The mixing device for cake production according to claim 1, characterized in that, The vertical arm section of the scraper arm (6) is also provided with spirally distributed guide vanes (7.1), and the spiral angle of the guide vanes (7.1) is 25-35°.

6. The mixing device for cake production according to claim 1, characterized in that, The variable frequency speed control motor (2) has a rated power of 3-7.5kW and a speed adjustment range of 30-120rpm. The speed reduction ratio of the reducer is 1:15-1:30.

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