Food processor with reliable positioning

Abstract

The application provides a food processor with reliable positioning, a crushing knife including a mincing knife and a kneading knife which can be used instead of the mincing knife, a spacer is clamped between the bottom surface of a positioning shaft and the inner bottom surface of a crushing cup, the positioning shaft is internally provided with a positioning hole with an opening downward, and the height H of the knife shaft, the height H1 of the radial cooperation of the positioning shaft and the positioning groove, the transverse width L1 of the contact of the bottom surface of the positioning shaft and the top surface of the spacer, the outer diameter D1 of the bottom surface of the positioning shaft, the outer diameter D3 of the bottom surface of the shaft sleeve and the diameter D2 of the positioning hole satisfy: 0.15H-2≤H1, H1≤30mm, 0.18H1≤L1≤D1-D2, D1≤D3. The problems of the food processor with mincing and kneading functions and the easy loosening of the positioning shaft in the kneading state are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of food processing equipment, and specifically relates to a food processing machine with reliable positioning. Background Technology

[0002] Existing food processing machines, such as meat grinders, generally include a main unit with a built-in motor, a grinding cup assembly located below the main unit, and a grinding cup assembly comprising a grinding cup, a lid covering the mouth of the grinding cup, and a detachable grinding blade mounted on the grinding cup. The tip of the grinding blade passes through a through-hole in the lid and engages with the output of the motor. The bottom of the grinding blade has a positioning groove that engages with a positioning shaft protruding from the bottom surface of the grinding cup. A gasket is held between the bottom surface of the positioning shaft and the inner bottom surface of the grinding cup. Specifically, the positioning shaft also has a downward-facing positioning hole. A screw, acting as a fastener, passes from the outer bottom surface of the grinding cup, through the bottom of the grinding cup, the gasket, and into the positioning hole, locking the positioning shaft, gasket, and grinding cup in place. Generally, a 3mm diameter screw is used, and the diameter of the corresponding positioning hole is also approximately 3mm. To ensure reliable locking of the positioning shaft and grinding cup, the engagement height between the screw and the positioning hole should typically be no less than 5mm.

[0003] Regarding the form of the positioning shaft, existing technology discloses a meat grinder, including a blade shaft and blades distributed on the blade shaft. A bushing is embedded at the bottom of the inner cavity of the blade shaft, and a positioning groove is formed inside the bushing. The positioning shaft is inserted into the positioning groove to limit the movement of the grinding blades. Specifically, the positioning shaft is divided into two sections: the upper section has a smaller diameter, and the lower section has a larger diameter. The height of the upper section is greater than the height of the lower section. The positioning groove of the bushing is contoured to the positioning shaft, meaning the sidewall of the positioning shaft fits snugly against the positioning groove. Alternatively, the positioning shaft is cylindrical, with the outer sidewall of the cylindrical positioning shaft fitting snugly against the inner sidewall of the positioning groove. Regardless of the form of the positioning shaft, the existing fitting clearance between the positioning shaft and the positioning groove limiting section is 0.15mm, the outer diameter of the bottom of the positioning shaft is approximately 6mm-8mm, and the contact area between the positioning shaft and the gasket is approximately 28mm². 2 When the cutter shaft is tilted to its maximum position, the clearance is 0.3mm.

[0004] Some meat grinders, to expand their multi-functionality, typically use a single main unit to accommodate multiple grinding blades, such as meat grinder blades, egg beaters, dough kneaders, etc. This means that accessories like meat grinder blades, egg beaters, and dough kneaders can be interchanged. However, there is usually only one grinding cup, and even when multiple cups are used, the positioning shaft inside the cup is uniform. During testing, the applicant found that when the grinding blade is a dough kneader, in scenarios where 600g of flour + 300g of water is used to make 900g of dough, or in scenarios exceeding the rated capacity, the dough kneader experiences a significant load from the dough. This causes the blade shaft to wobble, putting pressure on the positioning shaft. Due to the long fit between the positioning shaft and the inner wall of the bushing, the lever arm of the positioning shaft on the bottom of the grinding cup and the gasket is long. In other words, the vertical force on the positioning shaft is large, easily causing the gasket and the bottom wall of the grinding cup to crush and deform. If the grinding cup is a glass cup, the bottom wall of the glass cup may also crack. Summary of the Invention

[0005] This invention provides a reliable food processing machine. The aim is to solve the problem of how to make the same positioning shaft adaptable to different pulverizing blades while avoiding the crushing, deformation, or even cracking of the gasket and the bottom wall of the pulverizing cup under heavy load kneading scenarios, based on the fact that the food processing machine adopts two interchangeable pulverizing blades (i.e., meat grinder and dough kneader) to achieve multi-functionality.

[0006] The technical solution adopted in this invention is as follows:

[0007] This application provides a food processing machine with reliable positioning. The food processing machine includes a main unit, a grinding cup, and grinding blades disposed within the grinding cup and driven by the main unit. The grinding blades include a meat grinder and a dough kneading blade replaceable by the meat grinder. A positioning shaft protrudes from the inner bottom surface of the grinding cup. Bushings are respectively embedded at the bottom of the blade shafts of the meat grinder and the dough kneading blade. Each bushing has a downward-facing positioning groove, which is inserted into the positioning shaft. A gasket is clamped between the bottom surface of the positioning shaft and the inner bottom surface of the grinding cup. The height of the cutter shaft is H, the radial fit height between the positioning shaft and the positioning groove is H1, the lateral width of the contact between the bottom surface of the positioning shaft and the top surface of the gasket is L1, the outer diameter of the bottom surface of the positioning shaft is D1, the outer diameter of the bottom surface of the bushing is D3, the positioning shaft is provided with a downward-facing positioning hole, the positioning hole is used to cooperate with fasteners to lock the positioning shaft to the bottom of the crushing cup, the diameter of the positioning hole is D2, wherein, 0.15H-2≤H1, H1≤30mm, 0.18H1≤L1≤D1-D2, D1≤D3.

[0008] Preferably, the positioning shaft includes a body section that extends into the positioning groove and radially limits the inner sidewall of the positioning groove, and a tail section that is located below the body section and radially expands. The bottom surface of the tail section is lower than the bottom surface of the bushing, and a gasket is clamped between the bottom surface of the tail section and the inner bottom surface of the crushing cup.

[0009] Preferably, a guide section that is radially reduced relative to the main body section is provided above the positioning shaft. When the pulverizing blade is a meat grinder, both the guide section and the main body section are radially limited to the inner wall of the positioning groove. When the pulverizing blade is a dough kneader, the fit clearance between the guide section and the inner wall of the positioning groove is greater than the fit clearance between the main body section and the inner wall of the positioning groove.

[0010] Preferably, the outer surface of the tail section includes a first annular surface that is radially outwardly inclined downward, and the inner surface of the positioning groove is provided with a mating inclined surface that limits and cooperates with the first annular surface.

[0011] Preferably, the tail section further includes a second annular surface disposed below the first annular surface, the second annular surface extending from the bottom edge of the first annular surface toward the gasket to intersect the gasket perpendicularly, and the outer diameter of the gasket is not less than the outer diameter of the second annular surface.

[0012] Preferably, the positioning shaft includes a guide section at the top and a body section that expands radially below the guide section. The height of the guide section is H2, and the height of the body section is H3, wherein H2 and H3 satisfy: 0.25≤H2 / H3≤0.75.

[0013] Preferably, when the shredder is a meat grinder, the outer side of the bushing of the meat grinder is provided with multiple upper steps with the stepped surface facing upward, and the inner cavity of the blade shaft of the meat grinder is provided with a lower step that cooperates with the multiple upper steps for limiting.

[0014] Preferably, the multi-level upper step includes a first upper step and a second upper step, wherein the first upper step is located above half the height of the positioning axis, and the second upper step is located below half the height of the positioning axis.

[0015] Preferably, the positioning shaft includes a guide section at the top and a body section that is located below the guide section and expands radially. The bottom end of the guide section and the top end of the body section are connected by a transition surface, which extends radially outward and downward.

[0016] Preferably, the positioning shaft further includes a guide section located at the top, the top of the guide section being an upwardly convex arc surface, the center of the arc surface having a plane that abuts against the top surface of the positioning groove, and the ratio of the outer diameter of the plane to the outer diameter of the guide section being between 0.1 and 0.5; or,

[0017] The crushing cup is a glass cup.

[0018] Due to the adoption of the above technical solution, the beneficial effects achieved by this invention are as follows:

[0019] 1. This invention provides a reliable food processor. By incorporating a meat grinder blade and a dough kneading blade that can be used interchangeably with the meat grinder blade, the food processor can perform at least two functions: meat grinding and dough kneading, thus meeting consumers' needs for multi-functionality. Furthermore, considering the different application scenarios of meat grinding and dough kneading—the meat grinder blade requires rapid grinding and has a relatively small load, while the dough kneading blade requires low-speed stirring and is subject to a large load—in existing technologies, when consumers operate beyond the rated capacity or when the machine's rated capacity is large, the gasket and the bottom of the grinding cup are prone to deformation under pressure, and the glass cup is prone to cracking. This application first incorporates a gasket between the bottom surface of the positioning shaft and the inner bottom surface of the grinding cup to prevent direct contact between the bottom surface of the positioning shaft and the inner bottom surface of the grinding cup, thus avoiding frictional wear and abnormal noise.

[0020] In this design, H1 is set to ≤ 30mm to avoid an excessively long positioning shaft, which would result in a very deep positioning groove and make cleaning difficult for consumers. Furthermore, 0.15H-2≤H1 is also required to ensure that the runout at the top of the cutter shaft is less than 2mm, preventing the cutter shaft from slipping off relative to the positioning shaft and meeting the design requirements.

[0021] Furthermore, we know that, assuming the lateral width L1 of the contact between the bottom surface of the positioning shaft and the top surface of the gasket remains constant, the longer the radial fit height H1 between the positioning shaft and the positioning groove, the better the alignment between the crushing blade and the positioning shaft, and the less likely the crushing blade is to wobble. However, the positioning groove becomes more difficult to clean. With H1 remaining constant, the larger the lateral width L1 of the contact between the bottom surface of the positioning shaft and the top surface of the gasket, the smaller the vertical force per unit area on the gasket. This makes the bottom of the gasket and the crushing cup less susceptible to deformation under pressure, potentially even causing the positioning shaft to loosen. However, the bushing needs to be raised to avoid the gasket, causing the overall blade shaft to shift upwards, affecting the upward lifting effect of the bottommost blade on the bottom surface of the crushing cup. Therefore, H1 and L1 are two interrelated parameters.

[0022] During our research, when the minimum H1 value was set to 5mm (i.e., the minimum vertical lever arm), at this height, if the L1 value was less than 3.71mm, although the positioning shaft would not loosen, the lateral runout of the cutter shaft would exceed 2mm due to the short positioning shaft. This could easily lead to jamming of the top of the cutter shaft relative to the output end of the host, or jamming of the bottom of the cutter shaft relative to the positioning shaft. Furthermore, the user experience when aligning the host and the cutter shaft would be poor. However, to address the cutter shaft runout issue, we found that when the H1 value was above 22.65mm, the cutter shaft runout met the design requirements. Therefore, we set the L1 value to be greater than or equal to 0.18H1 to avoid the problem of the gasket being crushed and deformed, causing the positioning shaft to loosen, and / or the runout of the top of the pulverizing blade shaft exceeding 2mm, causing the cutter shaft to slip relative to the positioning shaft, when the L1 value is less than 0.18H1.

[0023] On the other hand, considering that the bottom surface of the positioning shaft must have the width of a positioning hole for fasteners to insert and lock the positioning shaft, gasket, and bottom wall of the crushing cup together, the maximum value of L1 that can be set is the difference between the diameter of the bottom surface of the positioning shaft and the diameter of the positioning hole, i.e., L1 = D1 - D2. As for where (D1 - D2) can extend, considering the turbulence problem at the bottom of the crushing cup, in this application, the bottom surface of the positioning shaft can be extended to be vertically flush with the outer diameter of the bottom surface of the bushing, i.e., when D1 = D3, the value of L1 reaches its maximum. In this case, it is also advantageous to only need to raise the bottom of the bushing to allow the bottom of the positioning shaft to bulge outward radially, without increasing the overall height of the cutter shaft too much. If the outer diameter of the positioning shaft is set to D1 > D3, then the bottom of the positioning shaft must bulge radially outward. To avoid friction between the bottom of the cutter shaft and the gasket, the bottom of the cutter shaft needs to be too high. Consequently, the bottommost blade on the cutter shaft also needs to be raised. Without changing the original blade shape, the gap between the blade and the bottom of the grinding cup increases, which does not effectively lift the material at the bottom of the grinding cup. Therefore, L1 should satisfy 0.18H1 ≤ L1 ≤ D1 - D2, and D1 ≤ D3.

[0024] In summary, the solution proposed in this application, by limiting the correlation between H value, L1 value and H1, and the correlation between L1 value and D1, D2 and D3, achieves the following: it does not affect the material effect at the bottom of the crushing cup, the difficulty in cleaning the inside of the blade shaft, or the easy slippage of the crushing blade shaft relative to the positioning shaft, nor does it cause the gasket to be crushed and deformed, leading to the loosening of the positioning shaft, or even the risk of the glass cup cracking when the crushing cup is a glass cup.

[0025] 2. As a preferred embodiment of this application, the body section is radially fitted with the inner wall of the positioning groove to provide a force in the opposite direction to the yaw force when the cutter shaft is subjected to a yaw force, thereby straightening the cutter shaft. The radially enlarged tail section increases the contact width L1 between the bottom surface of the positioning shaft and the top surface of the gasket, reducing the risk of crushing of the gasket and the bottom of the crushing cup. Simultaneously, to avoid other additional problems, the bottom surface of the tail section is set lower than the bottom surface of the bushing to prevent direct contact and wear between the gasket and the bushing when the outer diameter of the gasket is larger than the outer diameter of the tail section.

[0026] 3. To ensure that a single positioning shaft can accommodate different grinding blades and prevent severe shaft misalignment, loosening of the positioning shaft, or crushing of the gasket and the bottom wall of the grinding cup under different functional states, this application further proposes different shapes for the shafts of the meat grinder and the dough mixer. Specifically, when the grinding blade is a meat grinder, both the guide section and the main body section are radially fitted with the inner wall of the positioning groove to increase the fit height H1 between the inner wall of the positioning groove and the positioning shaft. This provides good alignment for the meat grinder, ensuring coaxiality between the positioning shaft and the blade shaft and reducing operating noise. Furthermore, since the meat is relatively soft and does not easily clump together during grinding, the load on the meat grinder is much smaller than that on the dough mixer. Although the lever arm is increased due to the increased leverage caused by the radially fitted guide section and main body section with the inner wall of the positioning groove, the smaller load still minimizes the risk of the positioning shaft becoming loose or the gasket and the bottom wall of the grinding cup being crushed. When the shredder is used as a dough mixer, the load is large, so the vertical lever arm needs to be reduced to reduce the risk of the positioning shaft loosening and the gasket and the bottom wall of the shredder cup being crushed. Specifically, this is achieved by setting the fit clearance between the guide section and the inner wall of the positioning groove to be greater than the fit clearance between the body section and the inner wall of the positioning groove, so that the length of the lever arm is approximately the length of the body section.

[0027] 4. In a preferred embodiment of this application, the first annular surface of the tail section is fitted with the inclined surface of the positioning groove to achieve dual limiting of the bushing for the positioning shaft, both radially and axially. Furthermore, the first annular surface is inclined, providing a smooth transition between the body section and the tail section. During cleaning, water stains easily slide from the body section down the first annular surface to the bottom of the pulverizing cup, improving the consumer's cleaning experience.

[0028] 5. As a preferred embodiment of this application, this application provides a second annular surface that extends from the bottom edge of the first annular surface toward the gasket and intersects the gasket perpendicularly, so that the bottom surface of the tail section can be close to the gasket, thus preventing water stains from entering between them.

[0029] 6. As a preferred embodiment of this application, the height of the guide section with a smaller diameter is lower than the height of the main body section, thereby relatively lowering the center of gravity of the positioning shaft and improving the fixing reliability of the positioning shaft. Specifically, H2 and H3 satisfy: 0.25≤H2 / H3≤0.75. This avoids the situation where, when the H2 / H3 ratio is less than 0.25, the H2 value is too small, making it difficult to both set an upwardly raised arc surface and a vertically extending sidewall at the top of the guide section. On the other hand, it avoids the situation where, when the H2 / H3 ratio is greater than 0.75, the height of the bushing of the dough mixer and the positioning shaft is too small, making the dough mixer susceptible to a large swaying force and prone to slipping off relative to the positioning shaft.

[0030] 7. In a preferred embodiment of this application, the bushing is provided with multiple upper steps facing upwards on its outer surface, and a lower step is provided in the inner cavity of the meat grinder's blade shaft to limit and cooperate with the multiple upper steps, so that the bushing is subject to multiple axial limits in the axial direction. When installing the bushing, the axial limit of the upper steps by the lower step prevents the bushing from being over-pressed and embedded in the inner cavity of the blade shaft, thus avoiding axial displacement of the bushing. Furthermore, the multiple upper steps include a first upper step located above half the height of the positioning shaft and a second upper step located below half the height of the positioning shaft, so that the first upper step limits the upper radial portion of the positioning shaft, and the second upper step limits the lower radial portion of the positioning shaft, which has a multi-point straightening effect on the positioning shaft and improves the coaxiality between the positioning shaft and the meat grinder's blade shaft.

[0031] 8. In a preferred embodiment of this application, a transition surface extending radially outward and downward is provided between the guide section and the main body section. This allows water droplets to easily slide off the transition surface during cleaning of the positioning shaft, resulting in greater hygiene and cleanliness. Simultaneously, the presence of the transition surface enhances the connection strength between the bottom end of the guide section and the main body section, making the guide section less prone to deformation or even breakage relative to the main body section under significant swaying forces.

[0032] 9. As a preferred embodiment of this application, this application reduces the contact area between the top surface of the guide section and the top surface of the positioning groove by setting an arc surface, thereby reducing frictional noise between the two. Specifically, the ratio of the outer diameter of the plane to the outer diameter of the guide section should be set between 0.1 and 0.5 to avoid the frictional noise severely affecting the user experience when the plane is too large, and to avoid the excessive force per unit area of ​​the plane when the plane is too small, which could easily lead to wear and failure of the top surface of the positioning groove. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0034] Figure 1 This is a cross-sectional view of a food processing machine with a meat grinder blade installed according to one embodiment of the present invention;

[0035] Figure 2 This is a cross-sectional view of a food processing machine with a dough-making blade installed in one embodiment of the present invention;

[0036] Figure 3 for Figure 1 A magnified view of a portion of region a shown in the diagram;

[0037] Figure 4 for Figure 2 A magnified view of a portion of region b shown in the diagram;

[0038] Figure 5 This is a schematic diagram of the positioning shaft in one embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram illustrating the principle of the positioning shaft and the tool shaft at maximum skew in one embodiment of the present invention.

[0040] Figure label:

[0041] 1-Main unit; 11-Motor;

[0042] 2-Grinding cup; 21-Meat grinder; 211-Knife shaft; 2111-First step; 2112-Second step; 212-Blade; 22-Dough cutter; 23-Cup lid;

[0043] 3-Sleeve; 31-First upper step; 32-Second upper step;

[0044] 4-Positioning axis; 41-Guide section; 411-Transition surface; 412-Arc surface; 4121-Plane; 42-Body section; 43-Tail section; 431-First annular surface; 432-Second annular surface;

[0045] 5- Screws;

[0046] 6-Gasket. Detailed Implementation

[0047] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0048] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and / or "upper," etc., are for ease of description only and are not limited to a location or spatial orientation. The terms "comprising" or "including," etc., mean that the element or object preceding "comprising" or "including" covers the element or object listed following "comprising" or "including" and its equivalents, and do not exclude other elements or objects. The terms "connected," "linked," etc., are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0049] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0050] like Figures 1 to 6As shown, this application provides a food processor with reliable positioning, including a main unit 1 with a motor 11 inside, a grinding cup 2, and grinding blades installed inside the grinding cup 2 and driven by the main unit 1. The motor 11 in this application includes a motor body and a two-stage reduction gearbox, capable of outputting two different speeds. The grinding blades include a meat grinder 21 and a dough kneading blade 22, which can be used interchangeably with the meat grinder 21. The meat grinder 21 is adapted to a high-speed output end, and the dough kneading blade 22 is adapted to a low-speed output end, so that the food processor has at least two functions: meat grinding and dough kneading, meeting consumers' needs for multiple uses in one machine. Specifically, a positioning shaft 4 protrudes from the inner bottom surface of the grinding cup 2. A bushing 3 is embedded at the bottom of the blade shaft 211 of the meat grinder 21 and the dough kneading blade 22. The bushing 3 has a downward-facing positioning groove, which is inserted into the positioning shaft 4. That is, the meat grinder 21 and the dough kneading blade 22 can be adapted and installed with the positioning shaft 4 to achieve positioning of the lower end of the corresponding grinding blade. Typically, the mouth of the grinding cup 2 is covered with a cup lid 23. The center of the cup lid 23 has a through hole so that the top of the blade shaft 211 of the meat grinder 21 and the dough kneader 22 can pass through and be adapted to the output end of the motor 11. That is, the cup lid 23 achieves the upper positioning of the corresponding grinding blade.

[0051] It should be noted that this application does not specifically limit the material of the crushing cup 2; it can be either a steel cup or a glass cup.

[0052] More specifically, in this application, the positioning shaft 4 and the crushing cup 2 are fixed by screws 5, i.e., the fastener is screw 5. The bottom wall of the crushing cup 2 has a hole for the screw 5 to insert into, and the positioning shaft 4 has a downward-facing positioning hole. The positioning hole is used to cooperate with the fastener to lock the positioning shaft 4 to the bottom of the crushing cup 2. A washer 6 is clamped and installed between the bottom surface of the positioning shaft 4 and the inner bottom surface of the crushing cup 2. During installation, the screw 5 passes through the hole on the bottom wall of the crushing cup 2 from bottom to top, through the mounting hole of the washer 6, and extends into the positioning hole to clamp and lock the positioning shaft 4, washer 6, and bottom wall of the crushing cup 2. That is, the washer 6 is clamped between the bottom surface of the positioning shaft 4 and the inner bottom surface of the crushing cup 2 to avoid direct contact between the bottom surface of the positioning shaft 4 and the inner bottom surface of the crushing cup 2, which would cause friction, wear, and abnormal noise.

[0053] Because the working conditions of a food processor differ between meat grinding and dough kneading—partly due to the difference in materials, and partly due to the greater load experienced during dough kneading—this applicant discovered during their research that when the meat grinder blade 21 and the dough kneader blade 22 share the same positioning shaft 4, if the rated capacity of the grinding cup 2 is too large or exceeds its rated capacity, the gasket 6 and the bottom of the grinding cup 2 are prone to deformation under pressure, and the glass cup is prone to cracking. This problem has not yet occurred during meat grinding. Therefore, this application provides a solution:

[0054] First, the height H of the cutter shaft 211 and the radial fit height H1 between the positioning shaft 4 and the positioning groove are set to satisfy: 0.15H-2≤H1, and H1≤30mm. Specifically, the height of the cutter shaft 211 refers to the height of the plumb bob from the top to the bottom of the pulverizer blade, which can be referenced. Figure 1 , 2 .

[0055] The primary objective of this application is to address the problem in existing technologies where, during heavy-load operations such as dough kneading, the gasket 6 is easily crushed, leading to loosening of the positioning shaft 4. However, it is also important to avoid creating additional problems by addressing one issue at the expense of another. Therefore, this application also considers the values ​​of H and H1 in relation to each other, setting the H1 value to be less than 30mm to prevent the positioning shaft 4 from becoming too long, which would require the positioning groove to be adapted to be deeper, thus affecting the consumer's cleaning experience.

[0056] At the same time, refer to Figure 6 In the existing technology, the maximum runout of the positioning shaft 4 within the bushing 3 is 0.3mm, and the top of the positioning shaft 4 has an upwardly raised arc surface 412, half of which is approximately 2mm high. Therefore, with the portion of the positioning shaft 4 below the arc surface 412 radially engaged with the positioning groove, the total height of the positioning shaft 4 is (H1+2)mm. For the tool shaft 211, industry design requirements generally stipulate that the runout of its top end should not exceed 2mm. Therefore, referring to... Figure 6 This application illustrates a schematic diagram of the tool shaft 211 when tilted. The hypotenuse of the large triangle should be the actual length of the tool shaft 211 when it is at its maximum yaw. However, since the height of the tool shaft 211 is often much greater than 2mm, the hypotenuse and the vertical side of the large triangle are almost equal in size. For example, when the actual height H of the tool shaft 211 is 151mm (i.e., ... Figure 6 When the hypotenuse of the large triangle is 2mm, the height of the top of the cutter shaft 211 relative to the bottom of the plumb bob is approximately 150.99mm (i.e., the height of the plumb bob at the top of the cutter shaft 211 relative to the bottom of the plumb bob). Figure 6 (The vertical side of the large triangle). Therefore, in this application, the vertical side of the large triangle can be set to be equal to the actual height of the cutter shaft 211 when it is vertically set.

[0057] Therefore, in the calculation, this application uses the vertically extended straight side of the large triangle as the total height of the tool axis 211. Based on the calculation principle of similar triangles, we obtain: 0.3 / 2 = (H1 + 2) / H, that is, H1 = 0.15H - 2. However, since this is the most critical extreme value, in general, it is necessary to set the value of H1 to be larger to make the alignment effect of the positioning axis 4 on the tool axis 211 better. Therefore, it is necessary to set 0.15H - 2 ≤ H1.

[0058] Furthermore, while ensuring the easy cleaning of the blade shaft 211 and good straightening effect, the radial fit height between the positioning shaft 4 and the positioning groove is set to H1, the lateral width of the contact between the bottom surface of the positioning shaft 4 and the top surface of the gasket 6 is L1, the outer diameter of the bottom surface of the positioning shaft 4 is D1, the outer diameter of the bushing 3 is D3, and the positioning shaft 4 is provided with a downward-facing positioning hole. The positioning hole is used to cooperate with fasteners to lock the positioning shaft 4 to the bottom of the crushing cup 2. The diameter of the positioning hole is D2, wherein 0.18H1≤L1≤D1-D2, D1≤D3.

[0059] Detailed analysis: With the lateral width L1 of the contact between the bottom surface of the positioning shaft 4 and the top surface of the gasket 6 remaining constant, a longer radial fit height H1 between the positioning shaft 4 and the positioning groove results in better alignment between the crushing blade and the positioning shaft 4, making the crushing blade less prone to wobbling. However, this also makes the positioning groove more difficult to clean. With H1 remaining constant, a larger lateral width L1 of the contact between the bottom surface of the positioning shaft 4 and the top surface of the gasket 6 results in a smaller vertical force per unit area on the gasket 6. This makes the gasket 6 and the bottom of the crushing cup 2 less susceptible to deformation or even loosening of the positioning shaft 4. However, the bushing 3 needs to be raised to avoid the gasket 6, causing the overall blade shaft 211 to move upwards, affecting the upward lifting effect of the bottom blade 212 on the bottom surface of the crushing cup 2. Therefore, H1 and L1 are two interrelated parameters.

[0060] To explore the optimal relationship between H1 and L1 values, and the specific range of L1, so as to ensure that the blade shaft 211 will not slip off relative to the positioning shaft 4 and the sway is less than 2mm during both meat grinding and dough kneading, and that the gasket 6 will not be crushed or the positioning shaft 4 will not loosen under the heavier load of dough kneading, the applicant conducted multiple sets of experiments. A specific example is analyzed below. Table 1 shows whether the food processor exhibited abnormalities under different H1 and L1 values ​​during dough kneading. Table 2 shows whether the food processor exhibited abnormalities under different H1 and L1 values ​​during meat grinding.

[0061] It should be noted that the test conditions in Table 1 are as follows: the diameter of the positioning hole is 3.6mm, the height of the positioning shaft 4 is 25mm, the height H of the blade shaft 211 of the dough kneading knife 22 is 151mm, 600g of flour and 300g of water are added to make 900g of dough, and the outer diameter of the bottom surface of the bushing 3 is 16mm. The test conditions in Table 2 are as follows: the diameter of the positioning hole is 3.6mm, the height of the positioning shaft 4 is 25mm, the height H of the blade shaft 211 of the meat grinder 21 is 151mm, 900g of lean meat is processed, and the outer diameter of the bottom surface of the bushing 3 is 16mm. The grinding cup 2 is a glass cup to enhance the visual effect when the user observes the food grinding state. That is to say, when the positioning shaft 4 extends radially outward to be flush with the bottom edge of the bushing 3, the outer diameter D3 of the bottom surface of the bushing 3 is equal to the outer diameter D1 of the bottom surface of the positioning shaft 4.

[0062] It should also be noted that the letters A, B, C, D, and E in Tables 1 and 2 have the following meanings:

[0063] A: The food processing machine is operating normally. The positioning shaft 4 is reliably installed, the blade shaft 211 is easy to clean, the material at the bottom of the crushing cup 2 is fully involved in crushing, and the top of the crushing blade shaft 211 has a swing of less than 2mm and does not slip relative to the positioning shaft 4.

[0064] B: The material at the bottom of the crushing cup 2 is fully involved in the crushing process, meaning there is material residue at the bottom of the crushing cup 2 that has not been involved in the crushing process.

[0065] C: The positioning groove of the tool shaft 211 bushing 3 is too deep and difficult to clean.

[0066] D: The crushing and deformation of the gasket 6 caused the positioning shaft 4 to loosen, and even the crushed cup 2 to crack.

[0067] E: The top of the shredder shaft 211 swings more than 2mm, causing it to slip relative to the positioning shaft 4.

[0068] Table 1: Whether the food processing machine malfunctioned under different H1 and L1 values ​​during the dough kneading process.

[0069]

[0070] As shown in Table 1, when H1 is between 20.65mm and 30mm, and L1 is between 4mm and 16mm (i.e., the outer diameter D1 of the bottom surface of bushing 3), the food processor can operate normally in the dough kneading state. The positioning shaft 4 is reliably installed, the blade shaft 211 is easy to clean, the material at the bottom of the crushing cup 2 is fully involved in crushing, and the blade shaft 211 of the crushing blade has a runout of less than 2mm and does not slip relative to the positioning shaft 4. After conversion, 0.15H-2 = 0.15 * 151-2 = 20.65mm. When H1 is between 20.65mm and 30mm, the conditions 0.15H-2 ≤ H1 and H1 ≤ 30mm are met, indicating that the positioning shaft 4 of the food processor is reliably installed and the blade shaft 211 is easy to clean. After testing, the minimum value that can prevent the positioning shaft 4 from wobble is 3.71mm, i.e., L1 = 3.71 / 20.65 = 0.18. The maximum value of L1 is calculated as 12.4mm, where the outer diameter of the bottom surface of the bushing 3 is 16mm minus the outer diameter of the positioning hole is 3.6mm. Therefore, L1 must satisfy: 0.18H1 ≤ L1 ≤ D1 - D2, and in the extreme case, D1 = D3. Under normal circumstances, D1 and D3 must satisfy: D1 ≤ D3.

[0071] Specifically, when the L1 value is less than 0.18H1, the pad 6 will inevitably be crushed and deformed, causing the positioning shaft 4 to loosen. More specifically, there are three situations: (1) When the H1 value is greater than 30mm, it exceeds the limit range and easily causes the overall positioning shaft 4 to become longer. Then the positioning groove of the bushing 3 needs to be adapted to become deeper, making it difficult to clean the inside of the pulverizer shaft 211; (2) When the H1 value is within the preferred range, only the pad 6 is crushed and deformed, causing the positioning shaft 4 to loosen; (3) When the H1 value is less than 0.15H-2, when H1 is less than (0.15*151-2=20.65mm), the overall height of the positioning shaft 4 becomes shorter, and the straightening effect of the pulverizer shaft 211 deviates. The top of the pulverizer shaft 211 swings more than 2mm, and slips off relative to the positioning shaft 4. In this case, due to the large swing at the top of the pulverizer shaft, it is difficult to position the cup lid and the pulverizer shaft, as well as the main unit and the pulverizer shaft.

[0072] When the value of L1 is greater than D1-D2, there will inevitably be situation B: that is, the material at the bottom of the crushing cup 2 fully participates in the crushing, that is, there is material residue at the bottom of the crushing cup 2 that has not participated in the crushing. More specifically, there are three situations: (1) When the value of H1 is greater than 30mm, it is easy to cause the overall height of the positioning shaft 4 to become longer, then the positioning groove of the bushing 3 needs to be adapted to become deeper, making it difficult to clean the inside of the blade shaft 211 of the crushing knife; (2) When the value of H1 is within the preferred range, only situation B exists. (3) When the value of H1 is less than 0.15H-2, that is, when H1 is less than (0.15*151-2=20.65mm), the overall height of the positioning shaft 4 becomes shorter, and the straightening effect of the blade shaft 211 deviates, resulting in the top of the blade shaft 211 of the dough knives 22 swinging more than 2mm and slipping relative to the positioning shaft 4.

[0073] When the value of L1 satisfies the conditions 0.18H1≤L1≤D1-D2, D1≤D3, but does not satisfy 0.15H-2≤H1, H1≤30mm, two situations occur: (1) If the value of H1 is lower than (0.15H-2)mm, the food processing machine will experience situation E: the top of the shredder shaft 211 swings more than 2mm and slips off relative to the positioning shaft 4; (2) If the value of H1 is higher than 30mm, situation C will occur: the positioning groove of the shredder shaft 211 bushing 3 is too deep and difficult to clean, and because H1 is too long, situation D still exists when L1 is small.

[0074] It should be noted that in Table 1, the color intensity of the areas marked with condition A indicates that dark gray represents the better preferred range and light gray represents the second-best preferred range.

[0075] Table 2: Whether the food processor experienced any abnormalities under different H1 and L1 values ​​during meat grinding.

[0076]

[0077] As shown in Table 2, when H1 is between 20.65mm and 23mm, and L1 is between 0.4mm and 16mm (i.e., the outer diameter D1 of the bottom surface of bushing 3), the food processor can operate normally in the dough kneading state. The positioning shaft 4 is reliably installed, the blade shaft 211 is easy to clean, the material at the bottom of the crushing cup 2 is fully involved in crushing, and the runout of the blade shaft 211 of the crushing blade is less than 2mm and does not slip relative to the positioning shaft 4. However, when H1 is greater than 25mm and L1 is 0.4mm, the vertical force on the gasket 6 is too large, causing the force on the gasket 6 per unit area to exceed the bearing capacity of the gasket 6, and situation D still occurs. Similarly, when H1 is greater than 27mm and L1 is 0.7mm, situation D also occurs.

[0078] Table 2 also shows that when H1 is below (0.15H-2) mm, case E exists regardless of the change in L1 value; when L1 is greater than (D1-D2), case B is added; when L1 is greater than (D1-D2), case B exists regardless of the change in H1, and when L1 is 20.65 mm, case E is added, or when H1 exceeds 30 mm, case C is added; when H1 is greater than 30 mm, case C will occur. Specifically, when H1 is 32 mm or above and L1 is less than or equal to 2 mm, case D will occur, or when H1 is 3 mm and L1 is less than or equal to 0.7 mm, case D will occur.

[0079] Therefore, by overlapping the ranges of region A in Tables 1 and 2, it is found that the range within which the food processing machine can operate under both the meat grinding and dough kneading states should be: 0.15H-2≤H1, H1≤30mm, 0.18H1≤L1≤D1-D2, D1≤D3.

[0080] More specifically, regarding the selection of the minimum and maximum values ​​of L1, the applicant provides the following explanation:

[0081] Regarding the minimum value limitation: During the research process, the applicant set the minimum H1 value to 5mm (i.e., the minimum vertical lever arm). At this height, if the L1 value is less than 3.71mm, although the positioning shaft 4 will not loosen, the lateral runout of the cutter shaft 211 will be greater than 2mm due to the short positioning shaft 4. This can easily lead to jamming of the top of the cutter shaft 211 relative to the output end of the host 1, or jamming of the bottom of the cutter shaft 211 relative to the positioning shaft 4. Moreover, the user's installation experience when aligning the host 1 with the cutter shaft 211 is also poor. However, to solve the problem of the runout of the cutter shaft 211, we found that when the H1 value is above 22.65mm, the runout of the cutter shaft 211 meets the design requirements. Therefore, the applicant should set the L1 value to be greater than or equal to 0.18H1 to avoid the problem of the gasket 6 being crushed and deformed, causing the positioning shaft 4 to loosen, when the L1 value is less than 0.18H1, and / or the sway of the top of the crusher shaft 211 being greater than 2mm, causing the blade shaft 211 to slip off relative to the positioning shaft 4.

[0082] Regarding the limitation on the maximum value: The bottom surface of the positioning shaft 4 must have the width of a positioning hole to allow the screw 5 to be inserted to lock the positioning shaft 4, the washer 6, and the bottom wall of the crushing cup 2 together. Therefore, the maximum value of L1 that can be set is the difference between the diameter of the bottom surface of the positioning shaft 4 and the diameter of the positioning hole, i.e., L1 = D1 - D2. As for where (D1 - D2) can extend, considering the turbulence problem at the bottom of the crushing cup 2, in this application, the bottom surface of the positioning shaft 4 can be extended to be vertically flush with the outer diameter of the bottom surface of the bushing 3, i.e., when D1 = D3, the value of L1 reaches its maximum. In this case, it is also advantageous to only need to raise the bottom of the bushing 3 to allow the bottom of the positioning shaft 4 to bulge outward radially, without increasing the overall height of the cutter shaft 211 too much. If the outer diameter D1 of the positioning shaft 4 is set to be greater than D3, then the bottom of the positioning shaft 4 must bulge radially outward. To avoid friction between the bottom of the cutter shaft 211 and the gasket 6, the bottom of the cutter shaft 211 needs to be too high. Consequently, the blade 212 at the bottom of the cutter shaft 211 also needs to be raised. Without changing the original shape of the blade 212, the gap between the blade 212 and the bottom of the crushing cup 2 increases, which does not provide a good lifting effect for the material at the bottom of the crushing cup 2. Therefore, L1 should satisfy 0.18H1≤L1≤D1-D2, D1≤D3.

[0083] In summary, the solution proposed in this application, by limiting the correlation between H value, L1 value and H1, and the correlation between L1 value and D1, D2 and D3, achieves the following: it does not affect the material effect at the bottom of the crushing cup 2, the difficulty in cleaning the inside of the blade shaft 211, or the easy slippage of the crushing blade shaft 211 relative to the positioning shaft 4, nor does it cause the gasket 6 to be crushed and deformed, leading to the loosening of the positioning shaft 4, or even the risk of the glass cup cracking when the crushing cup 2 is a glass cup.

[0084] It should also be noted that, generally speaking, reference Figure 3 , 4 The bottom of the positioning shaft 4 has a downward-extending positioning post, and the gasket 6 is fitted onto the outside of the positioning post. In this case, the value of L1 needs to be calculated by subtracting the diameter D2 of the positioning hole from the outer diameter D1 of the positioning shaft 4, then subtracting twice the wall thickness of the positioning post, and then subtracting the fitting clearance between the outer wall of the positioning post and the mating hole of the gasket 6. Therefore, in this case, L1 will be less than (D1-D2). Of course, the gasket 6 can also be glued or welded to the inner bottom surface of the crushing cup 2. In this case, the gasket 6 can only retain one hole for the screw 5 to pass through, and L1 will be equal to (D1-D2). If the positioning shaft 4 also extends radially to be flush with the outer wall of the bushing 3, then there exists a maximum limit value of L1=D1-D2=D3-D2.

[0085] Furthermore, in a preferred embodiment of this application, reference is made to... Figure 3 , 4 The positioning shaft 4 includes a body section 42 that extends into the positioning groove and radially limits its movement against the inner wall of the positioning groove, and a radially enlarging tail section 43 located below the body section 42. The bottom surface of the tail section 43 is lower than the bottom surface of the bushing 3, and a gasket 6 is held between the bottom surface of the tail section 43 and the inner bottom surface of the crushing cup 2. By radially engaging the body section 42 with the inner wall of the positioning groove, when the cutter shaft 211 is subjected to a yaw force, the body section 42 can provide a force in the opposite direction to the yaw force to straighten the cutter shaft 211. The radially enlarged tail section 43 increases the contact width L1 between the bottom surface of the positioning shaft 4 and the top surface of the gasket 6, reducing the risk of crushing of the gasket 6 and the bottom of the crushing cup 2. At the same time, to avoid other additional problems, the bottom surface of the tail section 43 is also set lower than the bottom surface of the bushing 3 to prevent the gasket 6 from directly contacting the bushing 3 and causing wear when the outer diameter of the gasket 6 is larger than the outer diameter of the tail section 43.

[0086] Based on the positioning axis 4, which includes a body segment 42 and a tail segment 43, this application provides the following embodiments:

[0087] Example 1:

[0088] The main body section 42 of the positioning shaft 4 is cylindrical, with an upwardly raised arc surface 412 only on the top surface of the main body section 42. Therefore, the height of H1 is equal to the side wall of the main body section 42 plus the height of the tail section 43 in relation to the positioning groove. Thus, the structure of the corresponding positioning groove is also cylindrical, and the positioning grooves of the meat grinder 21 and the dough kneader 22 have the same shape.

[0089] Example 2:

[0090] refer to Figure 5Above the positioning shaft 4, there is also a guide section 41 that is radially reduced relative to the body section 42, meaning the positioning shaft 4 is a three-section structure. Specifically, there is a clear distinction between the installation of the positioning shaft 4 and the positioning groove; see reference [link / reference] Figure 3 , 4 When the pulverizing blade is a meat grinder 21, both the guide section 41 and the body section 42 are radially limited to the inner wall of the positioning groove; when the pulverizing blade is a dough mixer 22, the clearance between the guide section 41 and the inner wall of the positioning groove is greater than the clearance between the body section 42 and the inner wall of the positioning groove, wherein, reference Figure 5 The H1 value is equal to the height H2 value of body segment 42.

[0091] This design sets the blade shafts 211 of the meat grinder 21 and the dough kneader 22 to different shapes, so that one positioning shaft 4 can be adapted to different grinding blades. Under different functional states, there will be no serious wobble of the blade shaft 211, loosening of the positioning shaft 4, or crushing of the gasket 6 and the bottom wall of the grinding cup 2.

[0092] Specific analysis: When the shredder is a meat grinder 21, the guide section 41 and the main body section 42 are radially limited to the inner wall of the positioning groove to increase the fitting height H1 between the inner wall of the positioning groove and the positioning shaft 4. This ensures that the positioning shaft 4 has a good straightening effect on the meat grinder 21, guarantees the coaxiality of the positioning shaft 4 and the blade shaft 211, and reduces working noise. At the same time, since the meat is relatively soft and does not easily clump together when grinding, the load on the meat grinder 21 is much smaller than that on the dough kneading knife 22. In this case, although the lever arm is increased by setting the guide section 41 and the main body section 42 to radially limit the inner wall of the positioning groove, the risk of the positioning shaft 4 loosening or the gasket 6 and the bottom wall of the grinding cup 2 being crushed is still unlikely due to the small load.

[0093] When the shredder is a dough-mixing blade 22, due to the large load, it is necessary to reduce the vertical lever arm to reduce the risk of the positioning shaft 4 loosening and the gasket 6 and the bottom wall of the shredder cup 2 being crushed. Specifically, this is achieved by setting the fit clearance between the guide section 41 and the inner wall of the positioning groove to be greater than the fit clearance between the body section 42 and the inner wall of the positioning groove, so that the length of the lever arm is approximately the length of the body section 42.

[0094] Example 3:

[0095] The difference between this embodiment and Embodiment Two is that the bushing 3 of the meat grinder 21 is made identical to the bushing 3 of the dough kneader 22, while the bushing 3 of the dough kneader 22 is identical to that in Embodiment Two. Since the load on the meat grinder itself is relatively small, even if the H1 value is maintained the same as that of the dough kneader 22, the meat grinder 21 will not exhibit a large amount of sway. Furthermore, from a cost and installation perspective, developing identical bushings 3 can reduce mold-making costs, and for assemblers, bushings 3 of the same shape are easier to install, thus accelerating assembly efficiency.

[0096] It is understandable that, as long as the following conditions are met: 0.15H-2≤H1, H1≤30mm, 0.18H1≤L1≤D1-D2, D1≤D3, the shape of the positioning shaft 4 in this application is not limited to embodiments one to three. The positioning shaft 4 can be extended vertically upward from the outer extension of the tail section 43, that is, the whole structure can be formed into a straight cylinder, which can also prevent the positioning shaft 4 from becoming loose. Moreover, the overall thickness of the positioning shaft 4 provides better support for the alignment of the tool shaft 211.

[0097] In a preferred embodiment of this application, the shape of the tail section 43 of the positioning shaft 4 is further considered. Specifically, refer to... Figure 5 The outer surface of the tail section 43 includes a first annular surface 431 that is radially outward and downward, and the inner surface of the positioning groove is provided with a mating inclined surface that is limited and matched with the first annular surface 431.

[0098] By engaging the first annular surface 431 of the tail section 43 with the inclined surface of the positioning groove, the bushing 3 achieves dual radial and axial positioning of the positioning shaft 4. Furthermore, the inclined design of the first annular surface 431 provides a smooth transition between the body section 42 and the tail section 43, allowing water to easily slide from the body section 42 down the first annular surface 431 to the bottom of the pulverizing cup 2 during cleaning, thus enhancing the cleaning experience for consumers.

[0099] Furthermore, by providing a second annular surface 432 that extends from the bottom edge of the first annular surface 431 toward the gasket 6 and intersects the gasket 6 perpendicularly, the bottom surface of the tail section 43 can be close to the gasket 6, preventing water stains from entering between them.

[0100] In a preferred embodiment, refer to Figure 5The applicant further provides that the positioning shaft 4 includes a guide section 41 at the top and a radially expanding body section 42 below the guide section 41. By setting the height of the guide section 41, which has a smaller diameter, to be lower than the height of the body section 42, the applicant lowers the center of gravity of the positioning shaft 4 and improves the fixing reliability of the positioning shaft 4. Specifically, the height of the guide section 41 is H2, and the height of the body section 42 is H3, wherein H2 and H3 satisfy: 0.25≤H2 / H3≤0.75. On the one hand, this avoids the situation where the H2 / H3 ratio is less than 0.25, making it difficult to simultaneously set the upwardly raised arc surface 412 and the vertically extending sidewall at the top of the guide section 41; on the other hand, it avoids the situation where the height of the bushing 3 of the dough-mixing knife 22 in limiting the fit with the positioning shaft 4 is too small when the H2 / H3 ratio is greater than 0.75, making the dough-mixing knife 22 susceptible to large swaying forces and prone to slipping off relative to the positioning shaft 4.

[0101] Further reference Figure 5 The bottom end of the guide section 41 and the top end of the body section 42 are connected by a transition surface 411, which extends radially outward and downward. By providing a transition surface 411 extending radially outward and downward between the guide section 41 and the body section 42, water droplets can easily slide off through the transition surface 411 during cleaning of the positioning shaft 4, resulting in greater hygiene and cleanliness. Simultaneously, the presence of the transition surface 411 enhances the connection strength between the bottom end of the guide section 41 and the body section 42, making the guide section 41 less prone to deformation or even breakage relative to the body section 42 under significant swaying forces.

[0102] It should be noted that when there is an inclined transition surface 411 between the guide section 41 and the body section 42, the transition surface 411 belongs to neither the guide section 41 nor the body section 42.

[0103] In some preferred embodiments of this application, reference is made to Figure 5 The positioning shaft 4 also includes a guide section 41 located at the top. The top of the guide section 41 is an upwardly convex arc surface 412. By setting the arc surface 412, the contact area between the top surface of the guide section 41 and the top surface of the positioning groove is reduced, thereby reducing frictional noise. Specifically, the ratio of the outer diameter of the plane 4121 to the outer diameter of the guide section 41 is set between 0.1 and 0.5 to avoid the frictional noise severely affecting the user experience when the plane 4121 is too large, and to avoid the excessive force per unit area of ​​the plane 4121 when the plane 4121 is too small, which could easily lead to wear and failure of the top surface of the positioning groove.

[0104] In some embodiments of this application, when the shredder is a meat grinder 21, refer to Figure 1 , 3The outer surface of the bushing 3 of the meat grinder 21 is provided with multiple upper steps facing upwards, and the inner cavity of the blade shaft 211 of the meat grinder 21 is provided with a lower step that cooperates with the multiple upper steps for limiting, so that the bushing 3 is subject to multiple axial limiting in the axial direction. When installing the bushing 3, the axial limiting of the upper steps by the lower step avoids the bushing 3 being over-pressed and too embedded in the inner cavity of the blade shaft 211, that is, when the bottom surface of the bushing 3 is higher than the bottom surface of the blade shaft 211, causing the bushing 3 to shift axially. In this case, the shape of the blade shaft 211 of the dough kneading knife 22 is not specifically limited, for example, it can be... Figure 4 In the case where the outer surface of the bushing 3 has only one upper step, the inner cavity of the cutter shaft 211 has a lower step that is matched with the upper step for limiting.

[0105] Furthermore, multiple upper steps are provided, including a first upper step 31 and a second upper step 32. The first upper step 31 is located above half the height of the positioning shaft 4, and the second upper step 32 is located below half the height of the positioning shaft 4. The first upper step 31 radially limits the upper part of the positioning shaft 4, and the second upper step 32 radially limits the lower part of the positioning shaft 4, which has the effect of aligning the positioning shaft 4 at multiple points and improving the coaxiality between the positioning shaft 4 and the blade shaft 211 of the meat grinder 21.

[0106] The technical solutions protected by this invention are not limited to the above embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the protection scope of this invention. Although the invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this invention are within the scope of protection claimed by this invention.

Claims

1. A food processing machine with reliable positioning, comprising a main unit, a grinding cup, and grinding blades disposed within the grinding cup and driven by the main unit, the grinding blades including a meat grinder and a dough kneading blade replaceable with the meat grinder, a positioning shaft protruding from the inner bottom surface of the grinding cup, bushings embedded at the bottom of the blade shafts of the meat grinder and the dough kneading blade, the bushings having downward-facing positioning grooves, the positioning grooves being inserted into the positioning shaft, and a gasket clamped between the bottom surface of the positioning shaft and the inner bottom surface of the grinding cup, characterized in that... The height of the cutter shaft is H, the radial fit height between the positioning shaft and the positioning groove is H1, the lateral width of the contact between the bottom surface of the positioning shaft and the top surface of the gasket is L1, the outer diameter of the bottom surface of the positioning shaft is D1, the outer diameter of the bottom surface of the bushing is D3, the positioning shaft is provided with a downward-facing positioning hole, the positioning hole is used to cooperate with fasteners to lock the positioning shaft to the bottom of the crushing cup, the diameter of the positioning hole is D2, wherein, 0.15H-2≤H1, H1≤30mm, 0.18H1≤L1≤D1-D2, D1≤D3.

2. The food processing machine with reliable positioning according to claim 1, characterized in that, The positioning shaft includes a body section that extends into the positioning groove and is radially limited to the inner sidewall of the positioning groove, and a tail section that is located below the body section and radially enlarged. The bottom surface of the tail section is lower than the bottom surface of the bushing, and a gasket is clamped between the bottom surface of the tail section and the inner bottom surface of the crushing cup.

3. The food processing machine with reliable positioning according to claim 2, characterized in that, Above the positioning shaft is a guide section that is radially reduced relative to the main body section. When the pulverizing blade is a meat grinder, both the guide section and the main body section are radially limited to the inner wall of the positioning groove. When the pulverizing blade is a dough kneader, the clearance between the guide section and the inner wall of the positioning groove is greater than the clearance between the main body section and the inner wall of the positioning groove.

4. The food processing machine with reliable positioning according to claim 2, characterized in that, The outer surface of the tail section includes a first annular surface that is radially outward and downward, and the inner surface of the positioning groove is provided with a mating inclined surface that limits and cooperates with the first annular surface.

5. The food processing machine with reliable positioning according to claim 3, characterized in that, The tail section also includes a second annular surface located below the first annular surface. The second annular surface extends from the bottom edge of the first annular surface toward the gasket and intersects the gasket perpendicularly. The outer diameter of the gasket is not less than the outer diameter of the second annular surface.

6. The food processing machine with reliable positioning according to claim 1, characterized in that, The positioning shaft includes a guide section at the top and a body section that expands radially below the guide section. The height of the guide section is H2, and the height of the body section is H3, wherein H2 and H3 satisfy: 0.25≤H2 / H3≤0.

75.

7. The food processing machine with reliable positioning according to claim 1, characterized in that, The outer side of the bushing of the meat grinder is provided with multiple upper steps with the stepped surface facing upward, and the inner cavity of the blade shaft of the meat grinder is provided with a lower step that cooperates with the multiple upper steps for limiting.

8. The food processing machine with reliable positioning according to claim 7, characterized in that, The multi-level upper step includes a first upper step and a second upper step, wherein the first upper step is located above half the height of the positioning axis, and the second upper step is located below half the height of the positioning axis.

9. The food processing machine with reliable positioning according to claim 1, characterized in that, The positioning shaft includes a guide section at the top and a body section that is located below the guide section and expands radially. The bottom end of the guide section and the top end of the body section are connected by a transition surface, which extends radially outward and downward.

10. The food processing machine with reliable positioning according to claim 1, characterized in that, The positioning shaft also includes a guide section at the top, the top of which is an upwardly convex arc surface. The center of the arc surface has a flat surface that abuts against the top surface of the positioning groove. The ratio of the outer diameter of the flat surface to the outer diameter of the guide section is between 0.1 and 0.5; or... The crushing cup is a glass cup.

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