Food processor reliable in positioning

Abstract

According to the food processing machine reliable in positioning, a smashing cutter comprises a meat mincing cutter and a dough kneading cutter which can be replaced with the meat mincing cutter for use, a mounting gasket is clamped between the bottom face of a positioning shaft and the inner bottom face of a smashing cup, and a positioning hole with a downward opening is formed in the positioning shaft; the height H of the cutter shaft, the radial matching height H1 of the positioning shaft and the positioning groove, the transverse width L1 of the bottom face of the positioning shaft making contact with the top face of the gasket, the outer diameter D1 of the bottom face of the positioning shaft, the outer diameter D3 of the bottom face of the shaft sleeve and the diameter D2 of the positioning hole meet the conditions that H1 is larger than or equal to 0.15 H-2, H1 is smaller than or equal to 30 mm, L1 is larger than or equal to 0.18 H1 and smaller than or equal to D1-D2, and D1 is smaller than or equal to D3. The problem that a positioning shaft of a food processor with meat mincing and dough kneading functions is easy to loosen in a dough kneading state is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of food processing equipment, and particularly relates to a food processor with reliable positioning. BACKGROUND

[0002] The existing food processor, such as a meat grinder, generally comprises a main machine with a built-in motor, a crushing cup assembly arranged below the main machine, the crushing cup assembly comprising a crushing cup, a cup cover arranged at the cup opening of the crushing cup, and a crushing knife detachably installed on the crushing cup. The top end of the crushing knife penetrates through the through hole of the cup cover and is in transmission cooperation with the output end of the motor. The bottom end of the crushing knife is provided with a positioning groove which is in plug-in cooperation with the positioning shaft protruding from the inner bottom surface of the crushing cup. The bottom surface of the positioning shaft and the inner bottom surface of the crushing cup are clamped with a gasket. Specifically, the positioning shaft is also provided with a downward-opening positioning hole. The screw, as a fastener, penetrates through the bottom of the crushing cup, the gasket and the positioning hole from bottom to top in sequence from the outer bottom surface of the crushing cup, so as to lock the positioning shaft, the gasket and the crushing cup. Generally, the diameter of the screw is 3mm, and the diameter of the positioning hole matched with the screw is also about 3mm. In order to ensure that the screw can reliably lock the positioning shaft and the crushing cup, the engagement height of the screw and the positioning hole is usually not less than 5mm.

[0003] For the shape of the positioning shaft, the existing technology discloses a meat grinder knife comprising a knife shaft and a plurality of knife leaves distributed on the knife shaft. The inner cavity of the knife shaft is embedded with a shaft sleeve at the bottom end. The inner part of the shaft sleeve forms the positioning groove. The positioning shaft is inserted into the positioning groove to realize the limiting of the crushing knife. Specifically, the positioning shaft is divided into two segments, the upper segment has a smaller diameter, and the lower segment has a larger diameter. The height of the upper segment is greater than that of the lower segment. The positioning groove of the shaft sleeve is shaped with the positioning shaft, that is, the side wall of the positioning shaft is in close contact with the positioning groove. Alternatively, the positioning shaft is in a straight cylinder shape. The outer side wall of the straight cylinder-shaped positioning shaft is in close contact with the inner side wall of the positioning groove. No matter which shape of the positioning shaft, the existing positioning shaft and the positioning groove limiting cooperation segment have a cooperation gap of 0.15mm. The outer diameter of the bottom of the positioning shaft is about 6mm-8mm. The contact area of the positioning shaft and the gasket is about 28mm 2 When the knife shaft is inclined to the maximum point, the cooperation gap is 0.3mm.

[0004] Some meat grinders usually use a main machine to adapt multiple crushing knives in order to expand the functions, and the crushing knives can be meat grinding knives, egg beating rods, dough mixing knives and the like. That is, the meat grinding knives, the egg beating rods, the dough mixing knives and the like can be used alternately. However, the cup body usually has only one, and even if multiple cup bodies are provided, the positioning shafts in the cup bodies are uniform. The applicant finds in the test that when the crushing knife is the dough mixing knife, in the scenario of 600 g of flour + 300 g of water to make 900 g of dough or in the scenario of exceeding the rated capacity, the dough mixing knife is subjected to a large load of the dough, the knife shaft of the dough mixing knife is subjected to a pressure on the positioning shaft due to the deflection, the positioning shaft has a long matching dimension in height with the inner side wall of the shaft sleeve, and the force arm of the positioning shaft on the bottom of the crushing cup and the gasket is long. That is, the vertical force on the positioning shaft is large, which easily causes the gasket and the bottom wall of the crushing cup to be crushed and deformed, and if the crushing cup is a glass cup, the bottom wall of the glass cup also has a cracking condition. SUMMARY

[0005] The application provides a food processor with reliable positioning, which aims to solve the problem of how to make the same positioning shaft adapt to different crushing knives and solve the problem of crushing and deforming or even cracking of the gasket and the bottom wall of the crushing cup in the scenario of a large load of dough on the basis of the food processor using two replaceable crushing knives (i.e. meat grinding knives and dough mixing knives) to realize multiple functions.

[0006] The technical scheme adopted by the application is as follows:

[0007] The application provides a food processor with reliable positioning, which comprises a main machine, a crushing cup, a crushing knife arranged in the crushing cup and driven to work by the main machine, the crushing knife comprising a meat grinding knife and a dough mixing knife replaceable with the meat grinding knife, the inner bottom surface of the crushing cup being provided with a positioning shaft, the bottom part of the knife shaft of the meat grinding knife and the dough mixing knife being respectively embedded with a shaft sleeve, the shaft sleeve being provided with a positioning groove with an opening downward, the positioning groove being inserted and matched with the positioning shaft, the bottom surface of the positioning shaft and the inner bottom surface of the crushing cup being clamped and installed with a gasket, the height of the knife shaft being H, the height of the radial matching of the positioning shaft and the positioning groove being H1, the transverse width of the contact between the bottom surface of the positioning shaft and the top surface of the gasket being L1, the outer diameter of the bottom surface of the positioning shaft being D1, the outer diameter of the bottom surface of the shaft sleeve being D3, the positioning shaft being internally provided with a positioning hole with an opening downward, the positioning hole being used to cooperate with a fastener to lock the positioning shaft to the bottom of the crushing cup, the diameter of the positioning hole being D2, wherein 0.15H-2≤H1, H1≤30 mm, 0.18H1≤L1≤D1-D2, and D1≤D3.

[0008] Preferably, the positioning shaft comprises a body segment extending into the positioning groove and being in radial limit cooperation with the inner sidewall of the positioning groove, and a tail segment arranged below the body segment and radially enlarged, the bottom surface of the tail segment being arranged lower than the bottom surface of the shaft sleeve, and a gasket being clamped between the bottom surface of the tail segment and the inner bottom surface of the pulverizing cup.

[0009] Preferably, the upper portion of the positioning shaft is further provided with a guide segment radially reduced relative to the body segment, when the pulverizing knife is a mincing knife, the guide segment and the body segment are both in radial limit cooperation with the inner sidewall of the positioning groove, and when the pulverizing knife is a dough knife, the cooperation gap between the guide segment and the inner sidewall of the positioning groove is greater than the cooperation gap between the body segment and the inner sidewall of the positioning groove.

[0010] Preferably, the outer surface of the tail segment comprises a first annular surface arranged obliquely downward along the radial direction, and the inner surface of the positioning groove is provided with a cooperation inclined surface in limit cooperation with the first annular surface.

[0011] Preferably, the tail segment further comprises a second annular surface arranged below the first annular surface, the second annular surface extends from the bottom end edge of the first annular surface towards the gasket to vertically intersect with the gasket, and the outer diameter of the gasket is not less than the outer diameter of the second annular surface.

[0012] Preferably, the positioning shaft comprises a guide segment at the top portion, and a body segment arranged below the guide segment and radially enlarged, the height of the guide segment is H2, and the height of the body segment is H3, wherein H2, H3 satisfy: 0.25≤H2 / H3≤0.75.

[0013] Preferably, when the pulverizing knife is a mincing knife, the outer surface of the shaft sleeve of the mincing knife is provided with a plurality of upper steps with the step surface facing upward, and the inner cavity of the knife shaft of the mincing knife is provided with a lower step in limit cooperation with the plurality of upper steps.

[0014] Preferably, the plurality of upper steps comprises a first upper step and a second upper step, the first upper step is located above half the height of the positioning shaft, and the second upper step is located below half the height of the positioning shaft.

[0015] Preferably, the positioning shaft comprises a guide segment at the top portion, and a body segment arranged below the guide segment and radially enlarged, the bottom end of the guide segment and the top end of the body segment are connected by a transition surface, and the transition surface extends obliquely downward along the radial direction.

[0016] Preferably, the positioning shaft further comprises a guide segment at the top portion, the top portion of the guide segment is an arc surface protruding upward, the center of the arc surface is provided with a flat surface abutting against the top surface of the positioning groove, and the ratio between the outer diameter of the flat surface and the outer diameter of the guide segment is between 0.1 and 0.5; or,

[0017] The pulverizing cup is a glass cup.

[0018] As the above technical solutions are adopted, the present application has the following beneficial effects:

[0019] 1. The present application provides a food processor with reliable positioning, which is provided with a pulverizing knife including a mincing knife and a kneading knife that can be used instead of the mincing knife, so that the food processor has at least two functions of mincing and kneading, meeting the demand of consumers for one machine with multiple functions. On this basis, based on the different application scenarios of mincing and kneading, the mincing knife needs to be quickly pulverized with relatively small load, and the kneading knife needs to be stirred at low speed when kneading, and is subjected to large load. In the prior art, when the consumer's excess capacity is operated or the rated capacity is large, the gasket and the bottom of the pulverizing cup are prone to be deformed under pressure, and the glass cup is prone to cracking. The present application first sets the bottom surface of the positioning shaft and the inner bottom surface of the pulverizing cup to clamp the gasket, so as to avoid direct contact between the bottom surface of the positioning shaft and the inner bottom surface of the pulverizing cup, and generate friction wear and friction noise.

[0020] In the present scheme, H1 is set to be less than or equal to 30 mm, so as to avoid the situation that the positioning shaft is too long, resulting in a deep positioning groove and difficulty for the consumer to clean. On the other hand, 0.15H-2≤H1 is also set, so that the amount of deflection of the top end of the knife shaft is less than 2 mm, and the knife shaft will not slip out relative to the positioning shaft, meeting the design requirements.

[0021] Further, we know that, under the premise that the transverse width L1 of the contact between the bottom surface of the positioning shaft and the top surface of the gasket is unchanged, the longer the height H1 of the radial cooperation between the positioning shaft and the positioning groove, the better the centering of the pulverizing knife and the positioning shaft, and the pulverizing knife is less likely to produce deflection, but the positioning groove is more difficult to clean. Under the premise that the value of H1 is unchanged, the greater the transverse 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, and the gasket and the bottom of the pulverizing cup are less likely to be deformed under pressure or even cause the positioning shaft to loosen, but the shaft sleeve needs to be raised to avoid the gasket, resulting in the upward movement of the overall knife shaft, affecting the lifting effect of the bottommost blade on the bottom surface of the pulverizing cup. Therefore, H1 and L1 are two parameters that are related to each other.

[0022] In the process of research, the applicant sets the minimum value of H1 as 5 mm (i.e. the minimum vertical force arm), and if the value of L1 is less than 3.71 mm, although the positioning shaft will not loosen, the lateral deflection of the cutter shaft will be greater than 2 mm due to the short positioning shaft, which will easily cause the top of the cutter shaft to be stuck relative to the output end of the main machine, or the bottom of the cutter shaft to be stuck relative to the positioning shaft, and the user's installation experience when aligning the main machine and the cutter shaft will also be poor. However, in order to solve the problem of the deflection of the cutter shaft, the applicant found that when the value of H1 is greater than or equal to 22.65 mm, the deflection of the cutter shaft meets the design requirements. Therefore, the applicant sets the value of L1 to be greater than or equal to 0.18H1, so as to avoid the problem that when the value of L1 is less than 0.18H1, the gasket is crushed and deformed, causing the positioning shaft to loosen, and / or the deflection of the top of the cutter is greater than 2 mm, causing the cutter to slip relative to the positioning shaft.

[0023] On the other hand, considering that the bottom surface of the positioning shaft must have a width of the positioning hole for the fastener to extend in to lock the positioning shaft, the gasket and the bottom wall of the crushing cup, 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 how far (D1 - D2) can extend, considering the problem of turbulence at the bottom of the crushing cup, the applicant sets the maximum extension of the bottom surface of the positioning shaft to be vertically flush with the outer diameter of the bottom surface of the shaft sleeve, i.e. D1 = D3, and the value of L1 reaches the maximum. In this case, it is also beneficial to only need to raise the bottom of the shaft sleeve for the bottom of the positioning shaft to protrude radially outward, without being too high the overall height of the cutter shaft. If the outer diameter D1 of the positioning shaft is greater than D3, the bottom of the positioning shaft must protrude radially outward, and in order to avoid friction between the bottom of the cutter shaft and the gasket, the bottom of the cutter shaft needs to be too high, and the bottommost blade on the cutter shaft also needs to be raised. Without changing the shape of the original blade, the gap between the blade and the bottom of the crushing cup increases, which does not have a good lifting effect on the material at the bottom of the crushing cup. Therefore, L1 should satisfy 0.18H1 ≤ L1 ≤ D1 - D2, and D1 ≤ D3.

[0024] In summary, the scheme of the present application, by limiting the correlation of H value, L1 value and H1, and the correlation of L1 value and D1, D2 and D3, achieves the effects of not affecting the material effect at the bottom of the crushing cup, not affecting the internal cleaning of the cutter shaft, and not causing the gasket to be crushed and deformed to cause the positioning shaft to loosen, or even the risk of the glass cup cracking when the crushing cup is a glass cup.

[0025] 2. As a preferred embodiment of the present application, the body section and the inner side wall of the positioning groove are radially matched to realize that when the knife shaft is subjected to a deflection force, the body section can provide a force in the opposite direction of the deflection force to right the knife shaft. The tail section is radially expanded to increase the contact width L1 between the bottom surface of the positioning shaft and the top surface of the gasket, thereby reducing the risk of crushing the gasket and the bottom wall of the crushing cup. At the same time, in order not to bring other additional problems, the bottom surface of the tail section is also set to be lower than the bottom surface of the shaft sleeve, so as to avoid the problem of direct contact between the gasket and the shaft sleeve and wear when the outer diameter of the gasket is larger than the outer diameter of the tail section.

[0026] 3. In order to make a positioning shaft adapt to different crushing knives and not appear the problems of serious deflection of the knife shaft and loosening of the positioning shaft, crushing of the gasket and the bottom wall of the crushing cup in different functional states, the knife shafts of the meat mincing knife and the flour mixing knife are set to different shapes in the present application. Specifically, when the crushing knife is a meat mincing knife, the guide section and the body section are radially limited to match the inner side wall of the positioning groove, so as to increase the matching height H1 between the inner side wall of the positioning groove and the positioning shaft, so that the positioning shaft has a good righting effect on the meat mincing knife, ensures the coaxiality of the positioning shaft and the knife shaft, and reduces the working noise. At the same time, since the meat is soft and not easy to form a ball in the mincing state, the load on the meat mincing knife is much smaller than that on the flour mixing knife. At this time, the guide section and the body section are radially limited to match the inner side wall of the positioning groove, although the force arm is increased, but due to the small load, the risk problems of loosening of the positioning shaft, crushing of the gasket and the bottom wall of the crushing cup are still difficult to appear. When the crushing knife is a flour mixing knife, since the load is large, it is necessary to reduce the vertical force arm to reduce the risk of loosening of the positioning shaft, crushing of the gasket and the bottom wall of the crushing cup, specifically by setting the matching gap between the guide section and the inner side wall of the positioning groove to be greater than the matching gap between the body section and the inner side wall of the positioning groove, so that the length of the force arm is approximately the length of the body section.

[0027] 4. As a preferred embodiment of the present application, the first annular surface of the tail section is limited to match the matching inclined surface of the positioning groove, so as to realize the double limitation of the radial limitation and the axial limitation of the shaft sleeve to the positioning shaft. Moreover, the first annular surface is inclined, so that there is a good transition between the body section and the tail section. When cleaning, water stains are easy to slide from the body section along the first annular surface to the bottom of the crushing cup, thereby improving the cleaning experience of consumers.

[0028] 5. As a preferred embodiment of the present application, the second annular surface is set to extend from the bottom end edge of the first annular surface to the gasket to be perpendicular to the gasket, so that the bottom surface of the tail section can be close to the gasket to avoid water stains entering therebetween.

[0029] 6. As a preferred embodiment of the present application, the height of the guide section with small diameter is lower than the height of the body section, so as to relatively reduce the gravity center of the positioning shaft and improve the fixing reliability of the positioning shaft. Specifically, H2 and H3 satisfy 0.25≤H2 / H3≤0.75. On the one hand, when the ratio of H2 / H3 is lower than 0.25, the value of H2 is too small, and it is difficult to set the arc surface upwardly protruding and the vertical extending sidewall on the top of the guide section. On the other hand, when the ratio of H2 / H3 is greater than 0.75, the height of the limit cooperation between the shaft sleeve of the knife and the positioning shaft is small, and the knife is easily slipped out relative to the positioning shaft under the large yawing force.

[0030] 7. As a preferred embodiment of the present application, the outer side of the shaft sleeve is provided with the multi-stage upper steps with the upwardly stepped surface, and the lower steps are arranged in the inner cavity of the knife shaft and limit cooperate with the multi-stage upper steps, so that the shaft sleeve is axially limited by the multi-stage. When the shaft sleeve is installed, the axial limit of the lower steps to the upper steps avoids the over-pressing of the shaft sleeve, which is embedded in the inner cavity of the knife shaft, and the axial displacement of the shaft sleeve. Further, the multi-stage upper steps include the first upper step above the half height of the positioning shaft and the second upper step below the half height of the positioning shaft, so that the first upper step limits the upper part of the positioning shaft in the radial direction, and the second upper step limits the lower part of the positioning shaft in the radial direction, which has the effect of multi-point righting of the positioning shaft, and improves the coaxiality between the positioning shaft and the knife shaft.

[0031] 8. As a preferred embodiment of the present application, the transition surface extending downwardly and outwardly in the radial direction is arranged between the guide section and the body section, so that the water droplets are easily slid off through the transition surface when the positioning shaft is cleaned, which is more hygienic and clean. At the same time, the connection strength between the bottom of the guide section and the body section is better due to the existence of the transition surface, and the guide section is not easy to deform or even break relative to the body section under the large yawing force.

[0032] 9. As a preferred embodiment of the present application, the arc surface is arranged to reduce the contact area between the top surface of the guide section and the top surface of the positioning groove, and reduce the frictional noise therebetween. Specifically, the ratio of the outer diameter of the plane to the outer diameter of the guide section is between 0.1 and 0.5, so as to avoid that when the plane is too large, the frictional noise seriously affects the user experience, and when the plane is too small, the stress in the unit area of the plane is too large, which easily leads to the wear and failure of the top surface of the positioning groove. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application. In the drawings:

[0034] Figure 1 A sectional view of the food processor provided in an embodiment of the present application when the meat mincing knife is installed;

[0035] Figure 2 A sectional view of the food processor provided in an embodiment of the present application when the dough kneading knife is installed;

[0036] Figure 3 A sectional view of the food processor provided in an embodiment of the present application when the meat mincing knife is installed; Figure 1 An enlarged view of area a shown in FIG. 1;

[0037] Figure 4 An enlarged view of area b shown in FIG. 1; Figure 2 An enlarged view of area b shown in FIG. 1;

[0038] Figure 5 A structural schematic view of the positioning shaft provided in an embodiment of the present application;

[0039] Figure 6 A schematic view of the positioning shaft and the knife shaft at the maximum deflection amount provided in an embodiment of the present application.

[0040] Reference signs:

[0041] 1 - main body; 11 - motor;

[0042] 2 - crushing cup; 21 - meat mincing knife; 211 - knife shaft; 2111 - first lower step; 2112 - second lower step; 212 - knife blade; 22 - dough kneading knife; 23 - cup cover;

[0043] 3 - shaft sleeve; 31 - first upper step; 32 - second upper step;

[0044] 4 - positioning shaft; 41 - guide section; 411 - transition surface; 412 - arc surface; 4121 - flat surface; 42 - body section; 43 - tail section; 431 - first annular surface; 432 - second annular surface;

[0045] 5 - screw;

[0046] 6 - gasket. DETAILED DESCRIPTION

[0047] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail in an exemplary manner with reference to the accompanying drawings.

[0048] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Unless otherwise defined, all terms of art used herein have the same meaning as commonly understood by one of ordinary skill in the art in the field of the application. As used in the specification and the claims, the use of "a", "an" and "the" are not intended to be limiting in any way. In addition, the use of relative terms such as "first", "second", and the like are not intended to denote a particular order or sequence, but are used for the purpose of nomenclature only. Similarly, the use of "one" or "the" is not intended to denote a singular noun, but rather a quantity of at least one. "Plural" or "a plurality" means two or more. Unless otherwise indicated, the terms "front", "back", "up", "down", and the like in the description and in the claims are used for convenience with reference to the orientation of the figures. The use of "including" and "comprising" and "having" and variations thereof are intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. The use of "connected" or "coupled" or "in communication with" or variations thereof is not restricted to physical or mechanical connections or relationships. The use of singular terms or expressions is not intended to exclude the plural unless the context clearly indicates otherwise. The use of "about" in relation to a given value is intended to encompass the given value plus or minus ten percent. The use of "and / or" in relation to a given set of items is intended to encompass all possible combinations of the items in the given set. The use of "and / or" in relation to a given set of items is intended to encompass all possible combinations of the items in the given set.

[0049] It is to be understood that the application can assume various alternative forms of embodiment, all of which are intended to fall within the scope of the application. Specific embodiments are described herein for purposes of illustration and not limitation.

[0050] As Figures 1 to 6As shown, the present application provides a food processor with reliable positioning, comprising a main unit 1 equipped with a motor 11, a grinding cup 2, and a grinding blade disposed within the grinding cup 2 and driven by the main unit 1. The motor 11 in the present application comprises a motor 11 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 that can be used interchangeably with the meat grinder 21. The meat grinder 21 is adapted for a high-speed output port, while the dough kneading blade 22 is adapted for a low-speed output port, enabling the food processor to have at least two functions: mincing meat and kneading dough, thus satisfying consumers' demand for a multi-purpose machine. Specifically, a positioning shaft 4 is protruding from the inner bottom surface of the grinding cup 2. The bottoms of the blade shafts 211 of the meat grinder 21 and the dough kneading blade 22 are each embedded with a shaft sleeve 3. The shaft sleeve 3 has a downward-facing positioning slot that engages with the positioning shaft 4. In other words, the meat grinder 21 and the dough kneading blade 22 can be individually mounted on the positioning shaft 4 to achieve positioning of the lower ends of the corresponding grinding blades. Typically, a cup cover 23 is provided at the mouth of the crushing cup 2, and a through hole is provided in the center of the cup cover 23 for the top of the knife shaft 211 of the meat grinder 21 and the dough knife 22 to pass through and adapt to the output end of the motor 11, that is, the cup cover 23 realizes the upper end positioning of the corresponding crushing knife.

[0051] It should be noted that the material of the grinding cup 2 is not specifically limited in the present application, and it can mainly be a steel cup or a glass cup.

[0052] More specifically, in this application, the positioning shaft 4 and the grinding cup 2 are secured together using a screw 5, i.e., the fastener is a screw 5. A hole for the screw 5 is provided in the bottom wall of the grinding cup 2, and a downward-facing positioning hole is provided in the positioning shaft 4. This positioning hole cooperates with the fastener to secure the positioning shaft 4 to the bottom of the grinding cup 2. A gasket 6 is clamped and installed between the bottom surface of the positioning shaft 4 and the inner bottom surface of the grinding cup 2. During installation, the screw 5 passes through the hole in the bottom wall of the grinding cup 2, passes through the mounting hole of the gasket 6, and extends into the positioning hole, thereby clamping and locking the positioning shaft 4, the gasket 6, and the bottom wall of the grinding cup 2. Specifically, the gasket 6 is clamped between the bottom surface of the positioning shaft 4 and the inner bottom surface of the grinding cup 2 to prevent direct contact between the bottom surface of the positioning shaft 4 and the inner bottom surface of the grinding cup 2, which could cause friction, wear, and abnormal noise.

[0053] Because the working conditions of a food processor for mincing meat and kneading dough are different, on the one hand due to the difference in materials, and on the other hand due to the greater load when kneading dough, the applicant discovered during research that when the meat grinder 21 and the dough kneading knife 22 share the same positioning shaft 4, if the rated capacity of the grinding cup 2 itself is too large or exceeds the rated capacity, the gasket 6 and the bottom of the grinding cup 2 are very likely to be compressed and deformed, and the glass cup is prone to cracking. However, this problem has not yet occurred in the minced meat state. To this end, the present application provides a solution:

[0054] Firstly, the height H of the cutter shaft 211 and the height H1 of the radial cooperation between the positioning shaft 4 and the positioning groove satisfy: 0.15H-2≤H1, and H1≤30mm. Specifically, the height of the cutter shaft 211 refers to the plumb height from the top end to the bottom end of the crushing knife, which can be referred to Figure 1 、 2 .

[0055] Since the important purpose of the present application is to solve the problem that the gasket 6 is crushed to cause the loosening of the positioning shaft 4 when the food processor performs the operation with a large load such as dough in the prior art. However, it is not desirable to lose sight of the forest for the trees and bring other additional problems. Therefore, in the present application, the values of H and H1 are also considered, and the value of H1 is set to be less than 30mm to avoid the positioning shaft 4 being too long, which causes the positioning groove to also need to be adaptively deepened, thereby affecting the cleaning experience of the consumer.

[0056] At the same time, referring to Figure 6 , the maximum deflection amount of the positioning shaft 4 in the shaft sleeve 3 in the prior art is 0.3mm, and the top of the positioning shaft 4 is provided with an upwardly protruding arc surface 412, and the height of half of the arc surface 412 is about 2mm, so that the total height of the positioning shaft 4 is (H1+2)mm in the case that the lower part of the arc surface 412 of the positioning shaft 4 is radially cooperated with the positioning groove. For the cutter shaft 211, the design requirement in the industry generally requires that the deflection amount of the top end of the cutter shaft 211 should not be greater than 2mm. Therefore, referring to Figure 6 , the present application illustrates the schematic diagram of the inclination of the cutter shaft 211, and the hypotenuse of the large triangle should be the actual length of the cutter shaft 211 at the maximum deflection amount. However, since the height of the cutter shaft 211 is often much greater than 2mm, the size of the hypotenuse of the large triangle is almost equal to the size of the vertical side. For example, when the actual height H of the cutter shaft 211 is 151mm (i.e. Figure 6 the hypotenuse of the large triangle), the plumb height of the top end of the cutter shaft 211 relative to the bottom end is about 150.99mm (i.e. Figure 6 the vertical side of the large triangle) in the case of deflection of 2mm. Therefore, in the present 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 arranged.

[0057] Therefore, in the calculation, the vertical straight side of the large triangle is taken as the total height of the cutter shaft 211 in the present application. According to the calculation principle of similar triangles, it is obtained that 0.3 / 2=(H1+2) / H, i.e. H1=0.15H-2. However, since this is the most extreme critical value, in general, it is also necessary to set the value of H1 to be greater, so that the righting effect of the positioning shaft 4 on the cutter shaft 211 is better. Therefore, it is necessary to set 0.15H-2≤H1.

[0058] Further, under the premise of ensuring easy cleaning of the knife shaft 211 and good righting effect, the height of the radial cooperation between the positioning shaft 4 and the positioning groove is H1, the transverse width of the bottom surface of the positioning shaft 4 in contact with 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 shaft sleeve 3 is D3, the positioning shaft 4 is internally provided with a downward-opening positioning hole for cooperating with a fastener to lock the positioning shaft 4 to the bottom of the crushing cup 2, and the diameter of the positioning hole is D2, wherein 0.18H1≤L1≤D1-D2, and D1≤D3.

[0059] Specific analysis: under the premise that the transverse width L1 of the bottom surface of the positioning shaft 4 in contact with the top surface of the gasket 6 is unchanged, the longer the height H1 of the radial cooperation between the positioning shaft 4 and the positioning groove, the better the centering of the crushing knife and the positioning shaft 4, and the more difficult the positioning groove is to clean. Under the premise that the value of H1 is unchanged, the greater the transverse width L1 of the bottom surface of the positioning shaft 4 in contact with the top surface of the gasket 6, the smaller the vertical force per unit area on the gasket 6, and the less likely the bottom of the gasket 6 and the crushing cup 2 is to be deformed by pressure or even cause the positioning shaft 4 to loosen, but the shaft sleeve 3 needs to be raised to avoid the gasket 6, resulting in the upward movement of the overall knife shaft 211, affecting the uplifting effect of the bottommost blade 212 on the bottom surface of the crushing cup 2. Therefore, the values of H1 and L1 are two interrelated parameters.

[0060] To explore the optimal correlation between the values of H1 and L1 and the specific range of L1, so as to ensure that the knife shaft 211 of the meat mincing and dough mixing state neither slips out relative to the positioning shaft 4 nor has a deflection of less than 2 mm, and that the gasket 6 is not crushed and the positioning shaft 4 is not loosened under a larger load of the dough mixing state, the present applicant has conducted multiple tests, and one of the embodiments is analyzed as follows. Table 1 shows whether the food processor appears abnormal under different values of H1 and L1 in the dough mixing state. Table 2 shows whether the food processor appears abnormal under different values of H1 and L1 in the meat mincing state.

[0061] It should be noted that the test conditions of Table 1 are as follows: the diameter of the positioning hole is 3.6 mm, the height of the positioning shaft 4 is 25 mm, the height H of the knife shaft 211 of the dough mixing knife 22 is 151 mm, 600 grams of flour and 300 grams of water are added to make 900 grams of dough, and the outer diameter of the bottom surface of the shaft sleeve 3 is 16 mm. The test conditions of Table 2 are as follows: the diameter of the positioning hole is 3.6 mm, the height of the positioning shaft 4 is 25 mm, the height H of the knife shaft 211 of the meat mincing knife 21 is 151 mm, 900 grams of lean meat is processed, and the outer diameter of the bottom surface of the shaft sleeve 3 is 16 mm. The crushing cup 2 is a glass cup to enhance the visual effect of the user observing the food crushing state. That is, when the positioning shaft 4 radially extends outward to be flush with the edge of the bottom surface of the shaft sleeve 3, the outer diameter D3 of the bottom surface of the shaft sleeve 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 meanings of the letters A, B, C, D, E in Tables 1 and 2 are as follows:

[0063] A: The food processor operates normally, the positioning shaft 4 is installed reliably, the cutter shaft 211 is easy to clean, the material at the bottom of the crushing cup 2 fully participates in crushing, the top end of the cutter shaft 211 of the crushing knife has a deflection of less than 2 mm and does not slip relative to the positioning shaft 4.

[0064] B: The material at the bottom of the crushing cup 2 fully participates in crushing, i.e. there is residual material at the bottom of the crushing cup 2 that does not participate in crushing.

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

[0066] D: The gasket 6 is crushed and deformed, causing the positioning shaft 4 to loosen, and even causing the crushing cup 2 to crack.

[0067] E: The top of the cutter shaft 211 of the crushing knife oscillates more than 2 mm and slips relative to the positioning shaft 4.

[0068] Table 1: Whether the food processor has an abnormality under different H1 and L1 values under the dough mixing state

[0069]

[0070] As can be seen from Table 1, when H1 is between 20.65 mm and 30 mm, and L1 is between 4 mm and 16 mm (i.e. the outer diameter D1 of the bottom surface of the shaft sleeve 3), the dough mixing state of the food processor can operate normally, the positioning shaft 4 is installed reliably, the cutter shaft 211 is easy to clean, the material at the bottom of the crushing cup 2 fully participates in crushing, the cutter shaft 211 of the crushing knife has a deflection of less than 2 mm and does not slip relative to the positioning shaft 4. After conversion, 0.15H-2 = 0.15*151-2 = 20.65 mm, when H1 is between 20.65 mm and 30 mm, the condition 0.15H-2≤H1 and H1≤30 mm is met, and the food processor positioning shaft 4 is installed reliably and the cutter shaft 211 is easy to clean. Through testing, the minimum value that can prevent the positioning shaft 4 from not deflecting at this time is 3.71 mm, i.e. L1 = 3.71 / 20.65 = 0.18; and the maximum value of L1 is the outer diameter of the bottom surface of the shaft sleeve 3 equal to 16 mm minus the outer diameter of the positioning hole of 3.6 mm, and L1 is calculated to be 12.4 mm. Therefore, L1 needs to meet: 0.18H1≤L1≤D1-D2, and in the case of the maximum limit, D1 = D3. Generally, D1 and D3 need to meet: D1≤D3.

[0071] Specific analysis, when L1 value is lower than 0.18H1, there will be gasket 6 crushing deformation and cause the positioning shaft 4 loose, more specific subdivision exists three kinds of situation: (1) H1 value is greater than 30mm, beyond the limited range, prone to cause the overall positioning shaft 4 height lengthen, then the positioning groove of shaft sleeve 3 needs to adapt to the deep, lead to the internal cleaning of the cutter shaft 211 of the crushing knife is difficult; (2) H1 value is in the preferred range, then only gasket 6 crushing deformation and cause the positioning shaft 4 loose; (3) H1 value is lower than 0.15H-2, H1 is lower than (0.15*151-2=20.65mm), the overall height of the positioning shaft 4 is low, the righting effect of the cutter shaft 211 is deviated, the top of the cutter shaft 211 of the face knife 22 swings more than 2mm, relative to the positioning shaft 4 slip, and in this case, due to the large amount of swing of the top of the cutter shaft, the positioning of the cup cover and the cutter shaft, and the alignment of the main machine and the cutter shaft are difficult.

[0072] When L1 value is greater than D1-D2, there will be situation B: the bottom material of the crushing cup 2 fully participates in the crushing, that is, the bottom of the crushing cup 2 has residual material that fails to participate in the crushing, and more specific subdivision exists three kinds of situation: (1) H1 value is greater than 30mm, prone to cause the overall positioning shaft 4 height lengthen, then the positioning groove of shaft sleeve 3 needs to adapt to the deep, lead to the internal cleaning of the cutter shaft 211 of the crushing knife is difficult; (2) H1 value is in the preferred range, then only situation B exists. (3) H1 value is lower than 0.15H-2, that is, H1 is lower than (0.15*151-2=20.65mm), the overall height of the positioning shaft 4 is low, the righting effect of the cutter shaft 211 is deviated, the top of the cutter shaft 211 of the face knife 22 swings more than 2mm, relative to the positioning shaft 4 slip.

[0073] When L1 value meets the condition 0.18H1≤L1≤D1-D2, D1≤D3, but does not meet 0.15H-2≤H1, H1≤30mm, two situations appear: (1) if H1 value is lower than (0.15H-2) mm, the food processor will appear situation E: the top of the cutter shaft 211 of the crushing knife swings more than 2mm, relative to the positioning shaft 4 slip; (2) if H1 value is higher than 30mm, situation C will appear: the positioning groove of the cutter shaft 211 shaft sleeve 3 is too deep, difficult to clean, and due to H1 is too long, there still exists situation D under the condition of small L1.

[0074] It should be noted that in the area marked with situation A in Table 1, the color depth represents: the darker gray is the better preferred range, and the lighter gray is the second selected preferred range.

[0075] Table 2: Whether the food processor appears abnormal under different H1 and L1 values in the state of mincing meat

[0076]

[0077] As can be seen from Table 2, when H1 is between 20.65 mm and 23 mm, and the value of L1 is between 0.4 mm and 16 mm (i.e. the outer diameter D1 of the bottom surface of the sleeve 3), the food processor can normally operate in the kneading state, the positioning shaft 4 is reliably installed, the cutter shaft 211 is easy to clean, the material at the bottom of the crushing cup 2 fully participates in the crushing, the amount of deflection of the cutter shaft 211 of the crushing knife is less than 2 mm, and the cutter shaft 211 does not slip relative to the positioning shaft 4. However, when the value of H1 is greater than 25 mm and L1 is 0.4 mm, because the vertical force on the gasket 6 is too large, the force per unit area on the gasket 6 exceeds the bearing range of the gasket 6, and situation D still exists. Similarly, when the value of H1 is greater than 27 mm and L1 is 0.7 mm, situation D also occurs.

[0078] As can also be seen from Table 2, when H1 is less than (0.15H-2) mm, situation E exists regardless of the value of L1; when L1 is greater than (D1-D2), situation B is additionally added; when L1 is greater than (D1-D2), situation B exists regardless of the value of H1, and when L1 is 20.65 mm, situation E is additionally added, or when H1 exceeds 30 mm, situation C is additionally added; when the value of H1 is greater than 30 mm, situation C occurs, and specifically, when H1 is 32 mm or more and L1 is less than or equal to 2 mm, situation D also occurs, or when H1 is 3 mm and L1 is less than or equal to 0.7 mm, situation D occurs.

[0079] Therefore, by overlapping the A region range of Table 1 and Table 2, it is found that the range in which the food processor can operate in the mincing and kneading states should be: 0.15H-2≤H1, H1≤30 mm, 0.18H1≤L1≤D1-D2, and D1≤D3.

[0080] More specifically, for the selection of the minimum and maximum values of L1, the applicant makes the following explanations:

[0081] For the minimum value: during the research, the applicant set the minimum value of H1 to be 5 mm (i.e., the minimum vertical force arm), and at this height, if the value of L1 is less than 3.71 mm, although the positioning shaft 4 will not loosen, due to the short positioning shaft 4, the lateral deflection of the cutter shaft 211 is greater than 2 mm, which easily leads to the situation that the top of the cutter shaft 211 is stuck relative to the output end of the main machine 1, or the bottom of the cutter shaft 211 is stuck relative to the positioning shaft 4, and the user's installation experience when aligning the main machine 1 and the cutter shaft 211 is also poor. However, in order to solve the problem of the deflection of the cutter shaft 211, the applicant found that when the value of H1 is greater than or equal to 22.65 mm, the deflection of the cutter shaft 211 meets the design requirements. Therefore, the applicant sets the value of L1 to be greater than or equal to 0.18H1, so as to avoid the situation that when the value of L1 is less than 0.18H1, the gasket 6 is crushed and deformed, causing the positioning shaft 4 to loosen, and / or the deflection of the top of the cutter shaft 211 is greater than 2 mm, causing the cutter shaft 211 to slip relative to the positioning shaft 4.

[0082] For the maximum value: considering that the bottom surface of the positioning shaft 4 must have a width of the positioning hole for the screw 5 to extend in to lock the positioning shaft 4, the gasket 6 and the bottom wall of the crushing cup 2, 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 problem of the bottom of the crushing cup 2, the applicant sets the maximum extension of the bottom surface of the positioning shaft 4 to be vertically flush with the outer diameter of the bottom surface of the shaft sleeve 3, i.e., D1 = D3, and the value of L1 reaches the maximum. In this case, it is also beneficial to only need to raise the bottom of the shaft sleeve 3 for the bottom of the positioning shaft 4 to be radially outwardly convex, without being too high for the overall height of the cutter shaft 211. If the outer diameter D1 of the positioning shaft 4 is greater than D3, the bottom of the positioning shaft 4 must be radially outwardly convex, in order 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, and the bottom blade 212 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 is increased, which does not have a good lifting effect on the material at the bottom of the crushing cup 2. Therefore, L1 should satisfy 0.18H1 ≤ L1 ≤ D1 - D2, and D1 ≤ D3.

[0083] In summary, the scheme of the present application, by limiting the correlation of H value, L1 value and H1, and the correlation of L1 value and D1, D2, D3, achieves the effects of not affecting the material effect at the bottom of the crushing cup 2, not affecting the internal cleaning of the cutter shaft 211, and not causing the gasket 6 to be crushed and deformed, causing the positioning shaft 4 to loosen, or even causing the glass cup to crack when the crushing cup 2 is a glass cup.

[0084] It should be further noted that, in general, referenceFigure 3 、 4 , the bottom of the positioning shaft 4 is provided with a positioning column extending downward, and the gasket 6 is sleeved outside the positioning column. In this case, the value of L1 needs to be the outer diameter D1 of the positioning shaft 4 minus the diameter D2 of the positioning hole, minus twice the wall thickness of the positioning column, and minus the fitting gap between the outer side wall of the positioning column and the fitting hole of the gasket 6. Therefore, in this case, L1 will be less than (D1-D2). Of course, the gasket 6 can also be adhered or welded to the inner bottom surface of the crushing cup 2, in which case the gasket 6 can only have a hole for the screw 5 to pass through, so that L1 is equal to (D1-D2), and when the positioning shaft 4 also extends radially to the outer side wall of the shaft sleeve 3, there is an extreme value of L1=D1-D2=D3-D2.

[0085] Further, in a preferred embodiment of the present application, referring to Figure 3 、 4 , the positioning shaft 4 includes a body segment 42 extending into the positioning groove and being in radial limiting fit with the inner side wall of the positioning groove, and a tail segment 43 radially enlarged and arranged below the body segment 42, the bottom surface of the tail segment 43 is arranged lower than the bottom surface of the shaft sleeve 3, and the gasket 6 is clamped between the bottom surface of the tail segment 43 and the inner bottom surface of the crushing cup 2. By arranging the body segment 42 in radial fit with the inner side wall of the positioning groove, when the knife shaft 211 is subjected to a deflection force, the body segment 42 can provide a force in the opposite direction of the deflection force to right the knife shaft 211. By radially enlarging the tail segment 43, the contact width L1 between the bottom surface of the positioning shaft 4 and the top surface of the gasket 6 is increased, reducing the risk of crushing the gasket 6 and the bottom of the crushing cup 2. At the same time, in order not to bring other additional problems, the bottom surface of the tail segment 43 is arranged lower than the bottom surface of the shaft sleeve 3, so as to avoid the problem of direct contact between the gasket 6 and the shaft sleeve 3 and wear when the outer diameter of the gasket 6 is relatively large relative to the outer diameter of the tail segment 43.

[0086] Based on the positioning shaft 4 including the body segment 42 and the tail segment 43, the present application gives the following examples:

[0087] Example one:

[0088] The body segment 42 of the positioning shaft 4 is straight, and only an arc surface 412 protruding upward is arranged on the top surface of the body segment 42, so the height H1 is equal to the side wall of the body segment 42 plus the height of the tail segment 43 in limiting fit with the positioning groove. Therefore, the structure of the corresponding positioning groove is also straight, and the positioning grooves of the meat grinder knife 21 and the dough knife 22 are consistent.

[0089] Example two:

[0090] Referring to Figure 5, the upper part of the positioning shaft 4 is further provided with a guide section 41 which is radially reduced relative to the body section 42, that is, the positioning shaft 4 is in a three-section type. Specifically, for the installation of the positioning shaft 4 and the positioning groove, there is a clear distinction, referring to Figure 3 , 4 : when the crushing knife is the mincing knife 21, the guide section 41 and the body section 42 are both in radial limiting cooperation with the inner side wall of the positioning groove; when the crushing knife is the kneading knife 22, the cooperation gap between the guide section 41 and the inner side wall of the positioning groove is greater than the cooperation gap between the body section 42 and the inner side wall of the positioning groove, wherein, referring to Figure 5 , the H1 value is equal to the height H2 value of the body section 42.

[0091] The present scheme sets the knife shaft 211 of the mincing knife 21 and the kneading knife 22 to be different shapes respectively, so that one positioning shaft 4 can adapt to different crushing knives, and in different functional states, the problems of serious deflection of the knife shaft 211, loosening of the positioning shaft 4, and crushing of the gasket 6 and the bottom wall of the crushing cup 2 do not occur.

[0092] Specific analysis: when the crushing knife is the mincing knife 21, the guide section 41 and the body section 42 are both set to be in radial limiting cooperation with the inner side wall of the positioning groove, so as to increase the cooperation height H1 between the inner side wall of the positioning groove and the positioning shaft 4, so that the positioning shaft 4 has a good righting effect on the mincing knife 21, ensures the coaxiality of the positioning shaft 4 and the knife shaft 211, and reduces the working noise. At the same time, since the meat is soft and not easy to form a ball in the mincing state, the load on the mincing knife 21 is much smaller than that on the kneading knife 22, so at this time, the guide section 41 and the body section 42 are both set to be in radial limiting cooperation with the inner side wall of the positioning groove, although the force arm is increased, but since the load is small, the risk problems of loosening of the positioning shaft 4, crushing of the gasket 6 and the bottom wall of the crushing cup 2 still do not occur.

[0093] When the crushing knife is the kneading knife 22, since the load is large, it is necessary to reduce the vertical force arm to reduce the risk of loosening of the positioning shaft 4, crushing of the gasket 6 and the bottom wall of the crushing cup 2, specifically by setting the cooperation gap between the guide section 41 and the inner side wall of the positioning groove to be greater than the cooperation gap between the body section 42 and the inner side wall of the positioning groove, so that the length of the force arm is approximately the length of the body section 42.

[0094] Embodiment three:

[0095] The difference between the present embodiment and Embodiment Two is that the shaft sleeve 3 of the meat mincing knife 21 is made consistent with the shaft sleeve 3 of the dough kneading knife 22, and the shaft sleeve 3 of the dough kneading knife 22 is consistent with that in Embodiment Two. Since the load on the meat mincing state itself is small, even if the H1 value is kept the same as that of the dough kneading knife 22, the meat mincing knife 21 will not have a large amount of deflection. Then, from the perspective of cost and installation, developing the same shaft sleeve 3 can reduce the cost of mold investment, and for the assembler, the same shape of the shaft sleeve 3 is easier to install, which can speed up the assembly efficiency.

[0096] It can be understood that as long as 0.15H-2≤H1, H1≤30mm, 0.18H1≤L1≤D1-D2, D1≤D3 are met, the positioning shaft 4 form of the present application can also not be 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, a straight cylinder is formed as a whole, which can also avoid the loosening of the positioning shaft 4. Moreover, the overall thickening of the positioning shaft 4 is more optimal for the righting strength of the knife shaft 211.

[0097] In a preferred embodiment of the present application, the form of the tail section 43 of the positioning shaft 4 is further considered. Specifically, referring to Figure 5 , the outer surface of the tail section 43 comprises a first annular surface 431 inclined downward and outward in the radial direction, and the inner surface of the positioning groove is provided with a matching inclined surface for limiting cooperation with the first annular surface 431.

[0098] By limiting cooperation of the first annular surface 431 of the tail section 43 with the matching inclined surface of the positioning groove, the shaft sleeve 3 realizes the double limiting of the radial and axial limiting of the positioning shaft 4. Moreover, the first annular surface 431 is inclined, so that there is a good transition between the body section 42 and the tail section 43. When cleaning, water stains easily slide from the body section 42 along the first annular surface 431 to the bottom of the pulverizing cup 2, improving the cleaning experience of consumers.

[0099] Further, the second annular surface 432 is provided and extends from the bottom end edge of the first annular surface 431 to the gasket 6 to vertically intersect the gasket 6, so that the bottom surface of the tail section 43 can be close to the gasket 6, avoiding water stains from entering between them.

[0100] In a preferred embodiment, referring to Figure 5The applicant also sets the positioning shaft 4 to include a guide section 41 located at the top and a body section 42 located below the guide section 41 and radially enlarged. The applicant reduces the height of the guide section 41 with a small diameter to be lower than the height of the body section 42, so as to relatively reduce the gravity center of the positioning shaft 4 and improve 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, H3 satisfy: 0.25≤H2 / H3≤0.75. On the one hand, when the ratio of H2 / H3 is lower than 0.25, the value of H2 is too small, and it is difficult to set the arc surface 412 upwardly protruding at the top of the guide section 41 and the vertical side wall; on the other hand, when the ratio of H2 / H3 is greater than 0.75, the height of the limiting cooperation between the shaft sleeve 3 of the face knife 22 and the positioning shaft 4 is small, and the face knife 22 is easy to be slipped out relative to the positioning shaft 4 under a large yawing force.

[0101] Further, referring to 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 extending downwardly and outwardly in the radial direction. By setting the transition surface 411 extending downwardly and outwardly in the radial direction between the guide section 41 and the body section 42, water droplets are easy to slide off through the transition surface 411 when the positioning shaft 4 is cleaned, which is more hygienic and clean. At the same time, the existence of the transition surface 411 makes the connection strength between the bottom end of the guide section 41 and the body section 42 more optimal, and the guide section 41 is not easy to deform or even break relative to the body section 42 under a large yawing force.

[0102] It should be noted that when the transition surface 411 is provided between the guide section 41 and the body section 42, the transition surface 411 does not belong to the guide section 41 or the body section 42.

[0103] In some preferred embodiments of the present application, referring to Figure 5 , the positioning shaft 4 further includes a guide section 41 located at the top, and the top of the guide section 41 is an arc surface 412 upwardly protruding. 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, and the frictional noise between the two is reduced. Specifically, the ratio of the outer diameter of the plane 4121 to the outer diameter of the guide section 41 is between 0.1 and 0.5, so as to avoid that when the plane 4121 is too large, the frictional noise seriously affects the user experience, and when the plane 4121 is too small, the stress in the unit area of the plane 4121 is too large, which easily leads to the top surface of the positioning groove being worn out and failed.

[0104] In some embodiments of the present application, when the crushing knife is a meat mincing knife 21, referring to Figure 1 , 3The outer side of the shaft sleeve 3 of the meat mincing knife 21 is provided with a plurality of upper steps with upward facing step surfaces, and the inner cavity of the knife shaft 211 of the meat mincing knife 21 is provided with lower steps for limiting cooperation with the plurality of upper steps, so that the shaft sleeve 3 is axially limited by the plurality of steps. When installing the shaft sleeve 3, the axial limitation of the upper step by the lower step avoids over-pressing of the shaft sleeve 3 and over-embedding of the shaft sleeve 3 in the inner cavity of the knife shaft 211, i.e. when the bottom surface of the shaft sleeve 3 is higher than the bottom surface of the knife shaft 211, the shaft sleeve 3 is axially displaced. In this case, the shape of the knife shaft 211 of the knife 22 is not specifically limited, for example, it can be Figure 4 In the case where the outer surface of the shaft sleeve 3 is only provided with one upper step, the inner cavity of the knife shaft 211 is provided with one lower step for limiting cooperation with the upper step.

[0105] Further, the plurality of upper steps include 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 limits the upper part of the positioning shaft 4 in the radial direction, and the second upper step 32 limits the lower part of the positioning shaft 4 in the radial direction, which has the effect of multi-point centering of the positioning shaft 4, and improves the coaxiality between the positioning shaft 4 and the knife shaft 211 of the meat mincing knife 21.

[0106] The technical solutions protected by the present application are not limited to the above embodiments. It should be noted that the combination of the technical solutions of any one embodiment with those of one or more other embodiments is within the scope of the present application. Although the present application has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application are within the scope of the present application.

Claims

1. A food processor with reliable positioning, comprising a main machine, a grinding cup, a grinding knife arranged in the grinding cup and driven to work by the main machine, the grinding knife comprising a mincing knife and a kneading knife which can be used instead of the mincing knife, a positioning shaft being protruded on the inner bottom surface of the grinding cup, a shaft sleeve being embedded on the bottom of the knife shaft of the mincing knife and the kneading knife respectively, the shaft sleeve being provided with a positioning slot with an opening downward, the positioning slot being inserted and matched with the positioning shaft, and a gasket being clamped and installed between the bottom surface of the positioning shaft and the inner bottom surface of the grinding cup, characterized in that, The height of the knife shaft is H, the height of the positioning shaft and the positioning groove is H1, the transverse width of 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 shaft sleeve is D3, the positioning shaft is provided with a downward opening positioning hole, the positioning hole is used for cooperating with a fastener to lock the positioning shaft to the bottom of the crushing cup, and the diameter of the positioning hole is D2, wherein 0.15H-2≤H1, H1≤30mm, 0.18H1≤L1≤D1-D2, and D1≤D3.

2. The positioning reliable food processor according to claim 1, characterized in that, The positioning shaft comprises a body segment extending into the positioning groove and being in radial limiting cooperation with the inner side wall of the positioning groove, and a tail segment being provided below the body segment and being radially enlarged, and the bottom surface of the tail segment is lower than the bottom surface of the shaft sleeve, and the gasket is clamped between the bottom surface of the tail segment and the inner bottom surface of the crushing cup.

3. The positioning reliable food processor according to claim 2, characterized in that, The upper part of the positioning shaft is further provided with a guide segment being radially reduced relative to the body segment, when the crushing knife is a meat mincing knife, the guide segment and the body segment are both in radial limiting cooperation with the inner side wall of the positioning groove, and when the crushing knife is a flour mixing knife, the cooperation gap between the guide segment and the inner side wall of the positioning groove is larger than the cooperation gap between the body segment and the inner side wall of the positioning groove.

4. The positioning reliable food processor according to claim 2, characterized in that, The outer surface of the tail segment comprises a first annular surface being inclined downward along the radial direction, and the inner surface of the positioning groove is provided with a cooperation inclined surface being in limiting cooperation with the first annular surface.

5. The positioning reliable food processor according to claim 3, characterized in that, The tail segment further comprises a second annular surface being provided below the first annular surface, the second annular surface extends from the bottom end edge of the first annular surface to the gasket to be perpendicularly intersected with the gasket, and the outer diameter of the gasket is not less than the outer diameter of the second annular surface.

6. The positioning reliable food processor according to claim 1, characterized in that, The positioning shaft comprises a guide segment at the top and a body segment being radially enlarged below the guide segment, the height of the guide segment is H2, and the height of the body segment is H3, wherein H2 and H3 satisfy 0.25≤H2 / H3≤0.

75.

7. The positioning reliable food processor according to claim 1, characterized in that, The outer side surface of the shaft sleeve of the meat mincing knife is provided with a plurality of upper steps with the stepped surface facing upward, and the inner cavity of the knife shaft of the meat mincing knife is provided with a lower step being in limiting cooperation with the plurality of upper steps.

8. The food processor of claim 7, wherein, The plurality of upper steps comprises a first upper step and a second upper step, the first upper step is located above half of the height of the positioning shaft, and the second upper step is located below half of the height of the positioning shaft.

9. The positioning reliable food processor according to claim 1, characterized in that, The positioning shaft comprises a guide segment at the top and a body segment being radially enlarged below the guide segment, the bottom end of the guide segment and the top end of the body segment are connected through a transition surface, and the transition surface extends downward along the radial direction outwardly inclined.

10. The positioning reliable food processor according to claim 1, characterized in that, The positioning shaft further comprises a guide segment at the top, the top of the guide segment is an upwardly protruding arc surface, the center of the arc surface is provided with a flat surface abutting against the top surface of the positioning groove, the ratio between the outer diameter of the flat surface and the outer diameter of the guide segment is between 0.1 and 0.5; or The crushing cup is a glass cup.

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