A grinding head and its grinding and juicing machine

Abstract

This utility model relates to the technical field of grinding and juicing machines, specifically a grinding head, comprising an upper dispensing section and a lower grinding section that are separately configured and arranged vertically. An upper rotating shaft is located at the bottom center of the upper dispensing section, with its lower end extending beyond the bottom of the upper dispensing section. A through hole is located at the center of the rotating shaft of the lower grinding section, within which the lower rotating shaft is fixedly mounted. A mounting hole is coaxially located within the lower rotating shaft, with its lower end extending beyond the bottom of the lower grinding section. The lower end of the upper rotating shaft is inserted into and passes through the mounting hole. This utility model, through its separately configured upper dispensing section and lower grinding section with independent rotating shafts, achieves differentiated speed control between the upper and lower components, effectively preventing food accumulation.

Description

Technical Field

[0001] This utility model relates to the field of grinding and juicing machine technology, and specifically to a grinding head and the grinding and juicing machine thereof. Background Technology

[0002] The grinding head is a standard component of a grinding and juicing machine and is well known to those skilled in the art.

[0003] For example, Chinese utility model patent with authorization announcement number CN206026001U discloses a vertical grinding and juicing machine, including a main unit and a grinding cup installed on the main unit. The grinding cup is provided with a main shaft, and a grinding head is installed on the main shaft. The main unit is provided with a driver, and the driver is connected to the main shaft for transmission. The grinding cup is provided with a storage cup, and the outlet of the storage cup is connected to the inlet of the grinding cup. The grinding head consists of two parts: the upper part is the cutting feed end (large pitch, large clearance structure), and the lower part is the extrusion grinding end (small pitch, small clearance structure). Because the grinding head adopts an integrated design, the upper and lower parts rotate at the same speed, causing a serious problem. The upper part's large cutting feed speed is much higher than the lower part's slow grinding and extrusion feed. During juicing, the food accumulates at the grinding end and cannot be squeezed downwards in time. The accumulated food will be squeezed upwards in the opposite direction. The squeezed food has already been crushed into powder or fruit puree and will stick to the grinding mesh or cup body, forming residue. This problem is particularly serious for soft foods, which seriously affects the user experience.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0005] The purpose of this invention is to provide a grinding head and a grinding and juicing machine, which have the advantages of solving the problem of food accumulation and improving the sealing effect.

[0006] This utility model provides a grinding head, including an upper dispensing part and a lower grinding part that are separately configured and arranged vertically. An upper rotating shaft is provided at the bottom rotation axis of the upper dispensing part, and the lower end of the upper rotating shaft extends out of the bottom of the upper dispensing part. A through hole is provided at the rotation axis of the lower grinding part, and a lower rotating shaft is fixedly installed in the through hole. A mounting hole is provided coaxially in the lower rotating shaft, and the lower end of the lower rotating shaft extends out of the bottom of the lower grinding part. The lower end of the upper rotating shaft is inserted into the mounting hole from the upper end of the mounting hole and passes through the mounting hole.

[0007] Furthermore, this utility model also proposes that the bottom of the lower grinding part is provided with a concave part, and the lower end of the lower rotating shaft extends out of the bottom of the lower grinding part and is placed in the concave part.

[0008] Furthermore, this invention also proposes a retaining ring between the upper and lower rotating shafts to prevent the upper rotating shaft from moving upward relative to the lower rotating shaft.

[0009] Furthermore, this utility model also proposes that the mounting holes include an upper mounting hole, a middle mounting hole, and a lower mounting hole that are sequentially connected and coaxially arranged; the diameter of the middle mounting hole matches the diameter of the upper rotating shaft; the diameter of the middle mounting hole is smaller than the diameter of the upper mounting hole; the diameter of the middle mounting hole is smaller than the diameter of the lower mounting hole; a sealing ring is fitted inside the lower mounting hole, and an annular groove is provided at the lower part of the upper rotating shaft; the inner edge of the retaining ring is inserted downward into the groove, and the outer edge of the retaining ring is abutted upward against the bottom of the sealing ring.

[0010] Furthermore, this utility model also proposes that a pressing part is provided at the bottom of the upper rotating shaft connecting the upper material distribution part, the diameter of the pressing part matches the diameter of the upper mounting hole, after the upper rotating shaft is inserted into the mounting hole, the pressing part is located in the upper mounting hole, and a sealing ring is provided between the bottom of the pressing part and the bottom of the upper mounting hole.

[0011] Furthermore, this utility model proposes that the upper material distribution section be a cutting section or a grinding section.

[0012] Furthermore, this utility model also proposes that the upper material distribution section and the upper rotating shaft are integrally arranged; and the lower grinding section and the lower rotating shaft are integrally arranged.

[0013] Furthermore, this utility model also proposes a grinding and juicing machine, including a main unit and a grinding cup disposed on the main unit. The grinding cup is provided with a juice outlet and a pulp outlet. A grinding screen is disposed inside the grinding cup. The grinding screen is provided with the aforementioned grinding head. The main unit is provided with a dual-output shaft motor, one output shaft drives the upper rotating shaft, and the other output shaft drives the lower rotating shaft.

[0014] Furthermore, this utility model also proposes that the grinding cup be provided with a material storage box assembly.

[0015] As can be seen from the above, the grinding head and grinding juicer provided by this utility model, through the separate upper feeding part and lower grinding part with independent rotating shaft structure, realize differentiated speed control of the upper and lower parts, effectively prevent food accumulation and optimize sealing performance, and has the advantages of improving juice extraction efficiency and extending equipment service life. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of the grinding head of this utility model;

[0017] Figure 2 This is an exploded view of the grinding head of this utility model;

[0018] Figure 3 yes Figure 1 Enlarged view of A in the middle;

[0019] Figure 4 This is a cross-sectional structural diagram of the grinding and juicing machine of this utility model.

[0020] In the picture:

[0021] 1. Upper material distribution section; 11. Upper rotating shaft; 12. Pressing section; 13. Annular groove; 2. Lower grinding section; 21. Lower rotating shaft; 22. Upper mounting hole; 23. Middle mounting hole; 24. Inner recess; 25. Lower mounting hole; 3. Sealing ring; 4. Retaining ring; 5. Material storage box assembly; 6. Grinding screen; 7. Grinding cup; 8. Main unit. Detailed Implementation

[0022] The technical solution of this utility model will be described below with reference to the accompanying drawings and embodiments.

[0023] In existing technologies, the grinding head of a juicer typically adopts an integrated structure design, with the upper and lower parts rotating synchronously via the same drive shaft. When processing soft ingredients, this structure causes the food to accumulate in the grinding area and be squeezed out in the reverse direction due to the much higher feed speed at the cutting end than the processing speed at the grinding end. This results in fruit pulp-like residue adhering to the inner wall of the cup, severely affecting juice extraction efficiency and ease of cleaning.

[0024] To address the aforementioned issues, the researchers of this invention discovered that the key lies in achieving differentiated speed control between the upper and lower components. Analysis of the food processing flow revealed that the cutting and grinding stages require different speed parameters to match the material conveying speed. Based on this, the design approach shifted to a split-structure development, decomposing the traditional integral grinding head into independently driven upper and lower components while maintaining the coaxial alignment of the two parts.

[0025] like Figure 1-3 The present invention provides a grinding head, comprising an upper distributing part 1 and a lower grinding part 2 that are separately configured and positioned vertically. The upper distributing part 1 has an upper rotating shaft 11 at the bottom of its rotating axis, with the lower end of the upper rotating shaft 11 extending out of the bottom of the upper distributing part 1. The lower grinding part 2 has a through hole at the rotating axis, and a lower rotating shaft 21 is fixedly installed in the through hole. The lower rotating shaft 21 has a mounting hole coaxially arranged inside it, with the lower end of the lower rotating shaft extending out of the bottom of the lower grinding part 2. The lower end of the upper rotating shaft 11 is inserted into and passes through the mounting hole from the upper end of the mounting hole.

[0026] The upper feeding section 1 is a component with cutting or preliminary crushing functions, which can be a metal structure with spiral blades. Its function is to cut the food into blocks suitable for grinding. The lower grinding section 2 is a component with extrusion functions, which can be made of threaded ceramic material, used for fine grinding of pre-treated food. The upper rotating shaft 11 is a transmission component that passes through the center of the upper feeding section 1 and extends downward. It can be a solid stainless steel shaft, used to transmit driving power and maintain rotational stability. The lower rotating shaft 21 is a hollow shaft component fixed in the through hole of the lower grinding section. Its internal mounting hole is used to accommodate the upper rotating shaft 11, and it can be made of copper alloy material to reduce friction loss.

[0027] Specifically, the upper feeding section 1 and the lower grinding section 2 are each controlled by an independent drive system, with the upper rotating shaft 11 nested within the mounting hole of the lower rotating shaft 21 to form a coaxial fit. When the drive unit drives the two rotating shafts respectively, the upper feeding section 1 can maintain a lower speed for stable cutting, while the lower grinding section 2 operates at a higher speed to accelerate material extrusion. The speed difference between the two components ensures that the cut food can be promptly received and processed by the lower grinding section 2, avoiding material accumulation caused by mismatched processing speeds. The nested shaft structure ensures that the upper and lower components remain coaxially aligned even when rotating at different speeds, preventing vibration or wear caused by eccentricity.

[0028] Compared to existing technologies, traditional solutions using an integral grinding head force the upper and lower components to operate at the same speed, failing to adapt to the differentiated speed requirements of the cutting and grinding stages. This solution achieves independent drive control through a split structure design, allowing the speeds of the upper dispensing section 1 and the lower grinding section 2 to be dynamically adjusted according to the characteristics of the food ingredients. The nested shaft structure effectively reduces the space occupied by the transmission system while ensuring coaxial accuracy.

[0029] Through the above technical solution, this utility model can effectively eliminate the accumulation of food in the grinding area and prevent the processed material from being extruded back and causing contamination of the cup. The split drive mechanism enables a dynamic match between the cutting speed and the grinding speed, improving the processing efficiency of both hard and soft food. The coaxial nested structure achieves differentiated rotational speeds while maintaining the stability of the equipment operation and extending the service life of key components.

[0030] The present invention further proposes that the bottom of the lower grinding part 2 is provided with an inner recess 24, and the lower end of the lower rotating shaft 21 extends out of the bottom of the lower grinding part 2 and is placed in the inner recess 24.

[0031] The recessed portion 24 refers to the space formed by the inward recess at the bottom of the lower grinding portion 2, which can be achieved through mold forming or machining, and is used to accommodate the lower end extensions of the upper rotating shaft 11 and the lower rotating shaft 21. The lower end of the lower rotating shaft 21 being placed in the recessed portion 24 means that the lower end extension of the lower rotating shaft 21 is completely embedded in the recessed portion 24 to avoid exposure and facilitate connection with the drive motor.

[0032] Specifically, the recess 24 encloses the lower extension of the lower rotating shaft 21, isolating it from the external environment. This structure restricts the connection between the lower rotating shaft 21 and the drive motor to within the recess 24, preventing food scraps or juices from entering the connection area. Simultaneously, the recess 24 provides support space for the lower rotating shaft 21, limiting its radial displacement and enhancing rotational stability.

[0033] Compared to existing technologies, the lower rotating shaft of a traditional grinding head is directly exposed at the bottom of the lower grinding section, causing food residue to easily adhere to the connection between the rotating shaft and the drive motor, and the exposed structure is susceptible to external interference. In contrast, this solution uses a recessed portion 24 to enclose the lower rotating shaft 21 and the upper rotating shaft 11, which not only prevents food from contacting the shaft but also enhances structural rigidity through the enclosed space.

[0034] Through the above technical solution, this utility model effectively solves the problem of food residue caused by the exposed lower rotating shaft 21. At the same time, the supporting effect of the concave part 24 enhances the stability of the rotating shaft operation and avoids vibration or displacement caused by loose connection, thereby improving juicing efficiency and equipment reliability.

[0035] The present invention further proposes to provide a retaining ring 4 between the upper rotating shaft 11 and the lower rotating shaft 24 to prevent the upper rotating shaft 11 from moving upward relative to the lower rotating shaft 21.

[0036] The retaining ring 4 is a ring-shaped mechanical component used to limit axial displacement. It can be implemented using an elastic retaining ring or a snap ring structure. Its inner diameter matches the outer diameter of the upper rotating shaft 11, and its outer diameter contacts the inner wall of the mounting hole of the lower rotating shaft 21. The retaining ring 4 is fixed to the pre-set annular groove 13 on the upper rotating shaft by a snap-fit ​​method, forming an axial blocking surface. Axial movement refers to the displacement of the rotating component along the axial direction, which is specifically constrained by the cooperation between the retaining ring 4 and the groove 13. The outer edge of the retaining ring 4 contacts the bottom of the sealing ring 3, forming a bidirectional limiting structure, preventing the upper rotating shaft 11 from moving upward when subjected to the reaction force of the food.

[0037] Specifically, when the upper dispensing section 1 is subjected to a reverse force generated by the compression of the food ingredients, the upper rotating shaft 11 tends to move upward. At this time, the inner edge of the retaining ring 4 engages with the annular groove 13 of the upper rotating shaft 11, and the outer edge of the retaining ring 4 abuts against the bottom of the sealing ring 3 in the mounting hole of the lower rotating shaft 21, forming an axial constraint. This structure prevents the upper rotating shaft 11 from moving upward along the mounting hole, thereby maintaining the designed distance between the upper dispensing section 1 and the lower grinding section 2. The retaining ring 4 directly transmits the axial load through mechanical contact, avoiding complex processes such as threaded locking or welding, and achieving reliable limiting while ensuring rotational freedom.

[0038] This utility model further proposes that the mounting holes include an upper mounting hole 22, a middle mounting hole 23 and a lower mounting hole 25 that are connected in sequence and coaxially arranged. The diameter of the middle mounting hole 23 matches the diameter of the upper rotating shaft 11. The diameter of the middle mounting hole 23 is smaller than the diameter of the upper mounting hole 22 and the lower mounting hole 25. A sealing ring 3 is fitted inside the upper mounting hole 22 and the lower mounting hole 25. An annular groove 13 is provided at the lower part of the upper rotating shaft 11. The inner edge of the retaining ring 4 is inserted downward into the groove 13 and the outer edge is abutted upward against the bottom of the sealing ring 3.

[0039] The upper mounting hole 22 refers to the expanded diameter section located at the top of the mounting hole, which can be achieved using a stepped hole machining process. Its diameter is larger than that of the middle mounting hole 23 to accommodate the pressing part and provide installation space for the sealing ring 3. The middle mounting hole 23 refers to the precision section that forms a clearance fit with the upper rotating shaft 11, which can be achieved using CNC turning. The difference between its diameter and the outer diameter of the upper rotating shaft 11 is controlled within the range of 0.05-0.15 mm, allowing relative rotation while limiting radial offset. The lower mounting hole 25 refers to the sealing section located at the bottom, which can be fixed to the sealing ring using a hot-press assembly process. Its diameter is larger than that of the middle mounting hole 23 to form an annular assembly groove. The sealing ring 3 is a dynamic seal made of food-grade silicone, which can be installed using an interference fit method. Its bottom plane forms a contact sealing surface with the retaining ring 4.

[0040] Specifically, when the upper rotating shaft 11 is inserted into the mounting hole, its pressing part 12 is constrained within the upper mounting hole 22 to form axial positioning. The precise fit between the middle mounting hole 23 and the upper rotating shaft 11 eliminates radial wobble, and the sealing ring 3 in the lower mounting hole 25 continuously adheres to the shaft surface during rotation. When the upper rotating shaft 11 experiences an upward tendency due to the reaction force of the material, the mechanical locking of the inner edge of the retaining ring 4 and the slot 13 directly blocks the axial displacement. At the same time, the continuous pressure of the outer edge of the retaining ring 3 on the sealing ring 3 maintains the sealing interface pressure. The stepped structure formed by the three-stage hole diameter change allows the upper rotating shaft 11 to obtain two radial support points, the upper mounting hole 22 and the middle mounting hole 23, when rotating at high speed, forming a triple dynamic stability system in conjunction with the sealing ring 3 at the lower mounting hole 25.

[0041] This utility model further proposes a technical solution in which a pressing part 12 with a diameter matching the upper mounting hole 22 is provided at the root of the upper rotating shaft 11 at the bottom of the upper material distribution part 1, and a sealing ring 3 is provided between the bottom of the pressing part 12 and the bottom of the upper mounting hole 22.

[0042] The pressing part 12 refers to the annular boss structure located at the connection between the upper rotating shaft 11 and the upper material distribution part 1. Specifically, it can be formed by coaxial machining with the upper rotating shaft 11, with its outer diameter forming a clearance fit or transition fit with the inner diameter of the upper mounting hole 22. This structure provides radial constraint through the axial contact surface, preventing the rotating shaft from eccentrically swaying. The sealing ring 3 refers to the elastic sealing element located between the contact surfaces of the metal parts. Specifically, it can be an O-ring made of silicone or fluororubber, which fills the fit gap through pre-compression deformation. This element expands radially when subjected to axial pressure, creating a dynamic sealing effect.

[0043] Specifically, when the upper dispensing section 1 and the lower grinding section 2 are assembled, the pressing section 12 is precisely embedded in the upper mounting hole 22. This mating structure achieves a primary seal through the machining precision of the metal contact surfaces, preventing most food particles from entering the shaft system gap. After the sealing ring 3 added between the metal contact surfaces is axially compressed, the elastomeric material expands radially to fill the annular gap, forming a secondary flexible sealing layer. This dual-sealing structure can withstand dimensional changes caused by the thermal expansion of metal components under high-speed differential rotation conditions, and can also compensate for axial assembly errors, continuously maintaining the sealing surface fit.

[0044] This utility model further proposes a technical solution where the upper material distribution section 1 is a cutting section or a grinding section.

[0045] The cutting section refers to a component with a cutting edge structure, which can be implemented using spiral blades or serrated blades. It breaks large pieces of food into small pieces suitable for grinding through a rotating cutting motion. The grinding section refers to a component with a grinding tooth structure, which can be implemented using staggered conical teeth or a grinding disc structure. It performs preliminary pulverization of the food through compression and friction.

[0046] Specifically, the cutting section is configured for rapid cutting of large, hard ingredients, and its large-gap structure allows material to pass quickly and enter the lower grinding section 2. When processing soft ingredients, the grinding section is configured to pre-crush the ingredients through fine teeth, forming a uniform material flow. These two structures are speed-matched to the fine grinding process of the lower grinding section 2, and the split design allows for independent control of the rotational speeds of the upper dispensing section 1 and the lower grinding section 2, preventing material accumulation at the junction.

[0047] This utility model further proposes a technical solution in which the upper material distribution part 1 is integrally set with the upper rotating shaft 11, and the lower grinding part 2 is integrally set with the lower rotating shaft 21.

[0048] The upper material distribution section 1 and the upper rotating shaft 11 are integrally set, meaning that they are formed into an inseparable rigid connection structure through an integral molding process. Specifically, this can be achieved using casting or injection molding processes, ensuring that the upper material distribution section 1 and the upper rotating shaft 11 maintain synchronous movement during rotation. Similarly, the lower grinding section 2 and the lower rotating shaft 21 are integrally set, meaning that the lower grinding section 2 and the lower rotating shaft 21 are formed into a single component through integral machining. Specifically, this can be achieved using turning or molding processes, ensuring that the lower grinding section 2 and the lower rotating shaft 21 have the same axis of rotation and no relative displacement.

[0049] Specifically, the upper feeding section 1 is connected to the drive mechanism via an integrally formed upper rotating shaft 11, and its rotation speed can be independently adjusted. The lower grinding section 2 is controlled by an independent drive source via a lower rotating shaft 21, achieving a rotation speed setting separate from both the upper feeding section 1 and the lower grinding section 2. During operation, the feeding speed of the upper feeding section 1 is controlled by adjusting the rotation speed of its upper rotating shaft 11, while the grinding speed of the lower grinding section 2 is controlled by the rotation speed of its lower rotating shaft 21, so that the feeding rate and grinding rate are dynamically matched. For example, when processing high-fiber ingredients, the rotation speed of the upper feeding section 1 can be reduced to decrease the feeding amount, while the rotation speed of the lower grinding section 2 can be increased to enhance grinding efficiency, thereby preventing the ingredients from accumulating at the grinding end.

[0050] like Figure 4 As shown, this utility model further proposes a grinding and juicing machine, including a main unit 8 and a grinding cup 7 disposed on the main unit. The grinding cup 7 is provided with a juice outlet 72 and a residue outlet 71. A grinding screen 6 is provided inside the grinding cup 7. The grinding screen 6 is provided with the aforementioned split grinding head. The main unit 8 is provided with a dual output shaft motor, one output shaft drives the upper rotating shaft 11, and the other output shaft drives the lower rotating shaft 21.

[0051] Among them, the split-type grinding head refers to the structure formed by the separate assembly of the upper material distribution section 1 and the lower grinding section 2. The dual-output shaft motor refers to the drive device with two independent power output ends. Specifically, it can be implemented by using a coaxial dual-winding motor or a parallel dual-rotor motor. Differentiated driving of the upper material distribution section 1 and the lower grinding section 2 is achieved by independently controlling the speed of the two output shafts.

[0052] Specifically, the upper feeding section 1 of the split-type grinding head is connected to one output end of a dual-output shaft motor via an upper rotating shaft 11, and the lower grinding section 2 is connected to the other output end via a lower rotating shaft 21. When the motor is running, the upper feeding section 1 performs cutting feeding at a first rotation speed, and the lower grinding section 2 performs extrusion grinding at a second rotation speed. Since the two rotation speeds can be independently adjusted by the motor, the cutting feeding speed and the grinding processing speed are matched, and the cut food is continuously conveyed downwards to the grinding area, avoiding accumulation at the junction of the upper and lower parts.

[0053] Through the above technical solution, this utility model achieves speed decoupling between the cutting and grinding processes, avoiding reverse extrusion and residue caused by food accumulation in the grinding area. The split drive structure ensures that the fragments of soft food are promptly conveyed downwards, reducing the contact time with the grinding mesh 6 or grinding cup 7, and effectively reducing the amount of fruit puree adhering.

[0054] This invention further proposes that the rotational speed of the upper rotating shaft 11 is less than or equal to the rotational speed of the lower rotating shaft 21.

[0055] The rotational speed of the upper rotating shaft 11 refers to the number of rotations per unit time of the transmission shaft driving the upper distributing section 1. This can be achieved by configuring a reduction gear set or adjusting the motor output power. This speed control ensures that the cutting feed rate matches the grinding capacity. Similarly, the rotational speed of the lower rotating shaft 21 refers to the number of rotations per unit time of the transmission shaft driving the lower grinding section 2. This can be achieved through an independent motor drive or a speed-changing transmission mechanism. Increasing this speed can accelerate the food grinding process.

[0056] Specifically, during the operation of the grinder and juicer, the upper feeding section 1 cuts the ingredients at a lower speed (e.g., 200-400 rpm) via the upper rotating shaft 11, while the lower grinding section 2 grinds and extrudes the ingredients at a higher speed (e.g., 500-800 rpm) via the lower rotating shaft 21. Dual output shaft motors control the speeds of the upper rotating shaft 11 and the lower rotating shaft 21 respectively, ensuring that when the chopped ingredients enter the grinding area, the high-speed rotation of the lower grinding section 2 can process the feed promptly, preventing ingredient accumulation due to insufficient processing speed. When the speed of the upper rotating shaft 11 equals that of the lower rotating shaft, the system maintains synchronous cutting and grinding; when the speed of the upper rotating shaft 11 is lower than that of the lower rotating shaft 21, a dynamic processing margin is created, ensuring that the grinding area always has redundant processing capacity.

[0057] In some specific implementations, the dual-output-shaft motor can be configured as a variable frequency motor, and the speed difference between the two shafts can be adjusted separately by a controller.

[0058] This utility model further proposes to provide a material storage box assembly 5 on the grinding cup 7.

[0059] The storage container assembly 5 refers to an independent container connected to the feed inlet of the grinding cup 7. Specifically, it can be implemented using a box structure with an adjustable opening, allowing the speed at which the ingredients enter the grinding cup 7 to be adjusted by controlling the size of the opening. The storage container assembly 5 can be equipped with partitions to form multiple storage areas for storing ingredients to be processed in stages.

[0060] The embodiments of the present utility model have been described above with reference to the accompanying drawings. However, the present utility model is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present utility model without departing from the spirit and scope of the claims, and all of these forms are within the scope of protection of the present utility model.

Claims

1. A grinding head, characterized in that: It includes an upper material distribution section (1) and a lower grinding section (2) that are set up separately and fitted from the bottom. An upper rotating shaft (11) is provided at the bottom rotating axis position of the upper material distribution section (1), and the lower end of the upper rotating shaft (11) extends out of the bottom of the upper material distribution section (1); The lower grinding part (2) has a through hole at the center of its rotating shaft. A lower rotating shaft (21) is fixedly installed in the through hole. A mounting hole is coaxially provided in the lower rotating shaft (21). The lower end of the lower rotating shaft (21) extends out of the bottom of the lower grinding part (2); The lower end of the upper rotating shaft (11) is inserted from the upper end of the mounting hole and passes through the mounting hole.

2. A polishing head according to claim 1, wherein: The lower grinding part (2) has a concave part (24) at the bottom, and the lower end of the lower rotating shaft (21) extends out of the bottom of the lower grinding part (2) and is placed in the concave part (24).

3. A polishing head according to claim 2, wherein: A retaining ring (4) is placed between the upper rotating shaft (11) and the lower rotating shaft (21) to prevent the upper rotating shaft (11) from moving upward relative to the lower rotating shaft (21).

4. A polishing head according to claim 3, wherein: The mounting holes include an upper mounting hole (22), a middle mounting hole (23), and a lower mounting hole (25) that are connected in sequence and coaxially arranged; the diameter of the middle mounting hole (23) matches the diameter of the upper rotating shaft (11); the diameter of the middle mounting hole (23) is smaller than the diameter of the upper mounting hole (22); the diameter of the middle mounting hole (23) is smaller than the diameter of the lower mounting hole (25); a sealing ring (3) is fitted inside the lower mounting hole (25); an annular groove (13) is provided at the lower part of the upper rotating shaft (11); the inner edge of the retaining ring (4) is inserted downward into the groove (13), and the outer edge of the retaining ring (4) abuts upward against the bottom of the sealing ring (3).

5. A polishing head according to claim 4, wherein: The upper rotating shaft (11) is connected to the upper material distribution section (1) at the bottom of which a pressing part (12) is provided. The diameter of the pressing part (12) matches the diameter of the upper mounting hole (22). After the upper rotating shaft (11) is inserted into the mounting hole, the pressing part (12) is located in the upper mounting hole (22). A sealing ring (3) is provided between the bottom of the pressing part (12) and the bottom of the upper mounting hole (22).

6. The polishing head of claim 1, wherein: The upper material distribution section (1) is a cutting section or a grinding section.

7. The polishing head of claim 1, wherein: The upper material distribution section (1) is integrally formed with the upper rotating shaft (11); the lower grinding section (2) is integrally formed with the lower rotating shaft (21).

8. A juicer comprising a main machine (8) and a grinding cup (7) arranged on the main machine (8), wherein the grinding cup (7) is provided with a juice outlet (72) and a residue outlet (72), and the grinding cup (7) is provided with a grinding net (6) therein, characterized in that: The grinding mesh (6) is provided with a grinding head as described in any one of claims 1-6, and the host (8) is provided with a dual-output shaft motor, one output shaft driving the upper rotating shaft (11) and the other output shaft driving the lower rotating shaft (21).

9. A grinding and juicing machine according to claim 8, characterized in that: The grinding cup (7) is provided with a material storage box assembly (5).

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