CN220236698U - food processor - Google Patents

Abstract

The application discloses cooking machine. The food processor comprises a stirring assembly, a stirring cup and a main machine, wherein the stirring assembly comprises a stirring shaft, the stirring shaft is provided with a shaft hole, and the shaft hole extends along the axial direction of the stirring shaft; the bottom of the stirring cup is provided with a mounting shaft. The installation shaft is inserted with the shaft hole, and part of the installation shaft is in surface contact with the shaft hole, and the other part of the installation shaft is spaced from the shaft hole. The motor of the host drives the stirring shaft to rotate around the mounting shaft, and drives the stirring assembly to rotate in the stirring cup. According to the arrangement, as one part of the surface of the mounting shaft is in contact with the shaft hole, and the other part of the surface of the mounting shaft is in interval, the contact area between the mounting shaft and the shaft hole is small, friction heating between the stirring shaft and the mounting shaft is reduced, noise is reduced, abnormal sound risk is reduced, and the whole machine experience is greatly improved.

Description

Food processor

Technical Field

The application relates to the technical field of small household appliances, in particular to a cooking machine.

Background

A food processor, such as a meat grinder, comprises a stirring knife assembly, a stirring bowl, a bowl cover and a main machine. The bottom of the stirring bowl is provided with a mounting shaft. The stirring blade assembly comprises a stirring shaft, and the stirring shaft is provided with a shaft hole. Through holes are formed in the stirring shaft and the bowl cover. The host is arranged on the bowl cover and comprises a motor. The motor drives the stirring blade assembly to rotate in the stirring bowl, thereby mincing the meat into meat stuffing.

In the meat grinder, the shaft hole is circular, the installation shaft is cylindrical, the installation shaft is inserted into the shaft hole, the shaft axis of the shaft hole coincides with the shaft axis of the installation shaft, however, because of the limit of manufacturing/process level, the installation shaft and the shaft hole cannot be completely coaxial, the shaft hole cannot completely ensure the circular shape, and in the high-speed rotation process, the contact area between the shaft hole and the installation shaft is large, and one or more of serious heating, obvious noise generation or abnormal noise risk can be caused due to friction.

Disclosure of Invention

An object of the present application is to provide a cooking machine. The stirring shaft of cooking machine and the installation axle of stirring cup area of contact is little, is favorable to reducing friction between stirring shaft and the installation axle and generates heat, one or more in noise reduction and the reduction abnormal sound risk.

The application provides a cooking machine. The food processor comprises a stirring assembly, a stirring cup and a main machine, wherein the stirring assembly comprises a stirring shaft, the stirring shaft is provided with a shaft hole, and the shaft hole extends along the axial direction of the stirring shaft; the bottom of the stirring cup is provided with a mounting shaft. The installation shaft is inserted with the shaft hole, and part of the installation shaft is in surface contact with the shaft hole, and the other part of the installation shaft is spaced from the shaft hole. The motor of the host drives the stirring shaft to rotate around the mounting shaft, and drives the stirring assembly to rotate in the stirring cup.

According to the arrangement, as one part of the surface of the mounting shaft is in contact with the shaft hole, and the other part of the surface of the mounting shaft is in interval, the contact area between the mounting shaft and the shaft hole is small, friction heating between the stirring shaft and the mounting shaft is reduced, noise is reduced, abnormal sound risk is reduced, and the whole machine experience is greatly improved.

In some embodiments, the mounting shaft is in line contact with an inner surface of the shaft bore to effect the partial surface contact, another partial surface spacing.

Through the arrangement, through line contact, the contact area between the inner surfaces of the installation shaft and the shaft hole is smaller, and friction heating between the stirring shaft and the installation shaft is reduced, so that one or more of noise reduction and abnormal sound risk reduction are facilitated.

In some embodiments, the inner surface of the shaft bore comprises a shaft bore side surface, the surface of the mounting shaft comprises a mounting shaft side surface, and the line contact comprises the mounting shaft side surface being tangential to the shaft bore side surface. Alternatively, one of the mounting shaft side surface and the shaft hole side surface protrudes toward the other to form a bead, the bead extending in an axial direction of the mounting shaft, and the line contact includes the bead contacting the other of the shaft hole side surface and the mounting shaft side surface.

As set forth above, since the line contact includes the mounting shaft side being tangential to the shaft bore side, it is further advantageous to reduce frictional heating between the stirring shaft and the mounting shaft, one or more of noise reduction and abnormal sound risk reduction. Through setting up protruding muscle, and protruding muscle is followed the axial extension of installation axle, with the help of protruding muscle makes a part surface contact between shaft hole and the installation axle, another part surface interval also is favorable to reducing friction between (mixing) shaft and the installation axle and generates heat, one or more in noise reduction and the reduction abnormal sound risk.

In some embodiments, the inner surface of the shaft bore comprises a shaft bore top surface connected to the shaft bore side surface, the surface of the mounting shaft comprises a mounting shaft top surface connected to the mounting shaft side surface, and the line contact comprises the shaft bore top surface being tangential to the mounting shaft top surface.

According to the arrangement, the top surface of the shaft hole is tangent to the top surface of the mounting shaft, the side surface of the shaft hole is tangent to the side surface of the mounting shaft, the contact area between the mounting shaft and the shaft hole is smaller, friction heating between the stirring shaft and the mounting shaft is reduced, and one or more of noise and abnormal noise risks are reduced.

In some embodiments, one of the shaft bore and the mounting shaft is polygonal in cross-section along the stirring shaft, and the other is circular in cross-section along the mounting shaft.

According to the arrangement, whether the shaft hole is polygonal along the cross section of the stirring shaft, the mounting shaft is circular along the cross section of the mounting shaft, or the shaft hole is circular along the cross section of the stirring shaft, the mounting shaft is polygonal along the cross section of the mounting shaft, the contact area during the matched rotation between the mounting shaft and the stirring shaft is reduced, and therefore friction heating between the stirring shaft and the mounting shaft is reduced, and one or more of noise and abnormal sound risks are reduced. Compared with the two, the shaft hole is polygonal along the cross section of the stirring shaft, and the mounting shaft is circular along the cross section of the mounting shaft, so that the mounting shaft or the stirring shaft can be manufactured more conveniently.

In some embodiments, the shaft hole top surface is arched toward the mounting shaft, the mounting shaft top surface is planar, or the shaft hole top surface is planar, and the mounting shaft top surface is arched toward the shaft hole top surface.

As the stirring shaft and the shaft hole are combined through the arch and the plane, the structure of each stirring shaft and the structure of each shaft hole are simple, the contact area is also more favorably reduced, and further, friction heating between the stirring shaft and the mounting shaft is favorably reduced, and one or more of noise and abnormal sound risks are reduced.

In some embodiments, the polygon is a regular polygon.

As set forth above, the polygon is a regular polygon, which is favorable for reducing friction heating between the stirring shaft and the mounting shaft, reducing noise and reducing one or more of abnormal sound risks.

In some embodiments, the inner surface of the shaft hole and the surface of the mounting shaft protrude one toward the other to form a plurality of spaced bumps, and the shaft hole is in point contact with the mounting shaft through the bumps to achieve the partial surface contact, and the other partial surface is spaced.

As the salient points are arranged, the shaft holes are in point contact with the mounting shafts through the salient points, the contact area between the shaft holes and the mounting shafts is reduced by point contact, friction heating between the stirring shafts and the mounting shafts is reduced, and one or more of noise and abnormal sound risks are reduced.

In some embodiments, the bumps are spherical in shape.

As set up above, the bump is spherical crown shape, is guaranteeing to be favorable to reducing friction between (mixing) shaft and the installation axle and generating heat, and noise reduction and reduction abnormal sound risk in the premise of one or more, because spherical crown shape's surface is smooth, the (mixing) shaft with rotate more smoothly between the installation axle.

In some embodiments, the stirring cup comprises a first stirring cup and a second stirring cup, the first stirring cup and the second stirring cup are respectively provided with the mounting shaft, and the material of the first stirring cup is different from the material of the second stirring cup.

As mentioned above, because the installation shaft and a part of the surface contact between the shaft holes, another part of the surface contact is spaced, the contact area is reduced, when the same stirring assembly is matched with different stirring cups, friction heating between the stirring shaft and the installation shaft is reduced, noise is reduced, and abnormal noise risk is reduced, because the cross section of the installation shaft along the installation shaft is circular, and the cross section of the shaft hole along the stirring shaft is circular, due to the limitation of manufacturing/technological level, the installation shaft and the shaft hole cannot be completely coaxial, the shaft hole cannot be completely guaranteed to be circular, the contact area is larger due to the matching of the installation shaft and the shaft hole, and the friction heating is serious, and obvious noise and abnormal noise risk are generated.

Drawings

FIG. 1 is a schematic illustration of a stirring assembly according to the related art;

fig. 2 is a sectional view of an assembly of a stirring member and a stirring cup in a horizontal direction in the related art, showing a state between a stirring shaft and a mounting shaft;

FIG. 3 is a partial cross-sectional view of a related art assembly of a stirring assembly and a stirring cup in a vertical direction;

FIG. 4 is an exploded view of a food processor including a first type of stirring assembly, shown in accordance with an embodiment of the present application;

FIG. 5 is a perspective view of a first stirring assembly according to an embodiment of the present application;

FIG. 6 is a cross-sectional view of the assembly of the first type of stirring assembly and the stirring cup taken in a horizontal direction, illustrating the state between the stirring shaft and the mounting shaft;

FIG. 7 is a partial cross-sectional view of an assembly of a first stirring assembly and a stirring cup in a vertical direction;

FIG. 8 is a perspective view of a second stirring assembly;

FIG. 9 is a perspective view of a third stirring assembly;

fig. 10 is a schematic view of a second agitator shaft assembled with a mounting shaft.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with some aspects of the present application as detailed in the accompanying claims.

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 defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "plurality" means two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

Referring to fig. 1, 2 and 3, in the related art, the shaft hole 111 of the stirring shaft 11 is a circular hole, and the mounting shaft 21 is a cylinder. Referring to fig. 2 and 3, the mounting shaft 21 is inserted into the shaft hole 111, and the contact area between the two is large. Because of manufacturing/process level limitations, the mounting shaft and the shaft hole cannot be completely coaxial, the shaft hole cannot completely ensure a circular shape, and in the high-speed rotation process, the shaft hole and the mounting shaft have large contact area, and one or more of serious heat generation, obvious noise generation or abnormal noise risk can be caused due to friction.

In order to solve the problems, embodiments of the application disclose a food processor. Referring to fig. 4, the food processor includes a stirring assembly 1, a stirring cup 2 and a main machine 3. Referring to fig. 5 and 4, the stirring assembly 1 includes a stirring shaft 11. The stirring shaft 11 is provided with a shaft hole 111. The shaft hole 111 extends in the axial direction of the stirring shaft 11. Referring to fig. 4 and 6 and to fig. 10, the bottom of the stirring cup 2 is provided with a mounting shaft 21. The mounting shaft 21 is inserted into the shaft hole 111, and a part of the surface of the mounting shaft 21 is in contact with the shaft hole 111, and the other part of the surface is spaced. The motor of the main machine 3 drives the stirring shaft 11 to rotate around the mounting shaft 21, so as to drive the stirring assembly 1 to rotate in the stirring cup 2.

As set forth above, since the mounting shaft 21 is in contact with a portion of the surface of the shaft hole 111 and another portion of the surface is spaced apart from the mounting shaft, the contact area between the mounting shaft 21 and the shaft hole 111 is small, which is advantageous for reducing friction heating between the stirring shaft and the mounting shaft, reducing noise and reducing one or more of risks of abnormal noise, thereby greatly improving the overall experience.

In some embodiments, the mounting shaft 21 is in line contact with the inner surface of the shaft bore 111 to achieve the partial surface contact, with another partial surface spacing.

As set forth above, by the line contact, the contact area between the mounting shaft 21 and the inner surface of the shaft hole 111 is smaller, which is more advantageous in reducing friction heat generation between the stirring shaft 11 and the mounting shaft 21, reducing one or more of noise and reducing risk of abnormal sound.

Referring to fig. 6 and 7, the inner surface of the shaft hole 111 includes a shaft hole side surface 112, the surface of the mounting shaft 21 includes a mounting shaft side surface 211, and the line contact includes the mounting shaft side surface 211 being tangential to the shaft hole side surface 112. The tangent may be as shown in fig. 6, the cross section of the shaft hole 111 is polygonal, the cross section is a plane along the radial direction of the shaft hole 111, and the following cross sections have the same meaning. The cross section of the mounting shaft 21 is a circle, which is an inscribed circle of the polygon, the cross section is a plane along the radial direction of the mounting shaft 21, and the meaning of the subsequent cross sections is the same, or the cross section of the mounting shaft 21 is a polygon, and the cross section of the shaft hole 111 is a circle, which is an circumscribed circle of the polygon. The skilled person will appreciate that the tangent of the shaft hole side surface 112 and the mounting shaft side surface 211 is not limited to the subsequent cross section of the shaft hole 111 being polygonal, the cross section of the mounting shaft 21 being circular, or the cross section of the shaft hole 111 being circular, the cross section of the mounting shaft 21 being polygonal, as long as the line contact is enabled, for example, one of the cross section of the mounting shaft and the cross section of the shaft hole 111 being irregular, the other being circular, etc.

As set forth above, since the line contact includes the mounting shaft side 211 being tangential to the shaft bore side 112, it is further advantageous to reduce friction heating between the stirring shaft and the mounting shaft, one or more of noise reduction and abnormal sound risk reduction.

As an alternative to the above embodiment, one of the mounting shaft side surface 211 and the shaft hole side surface 112 is protruded to the other to form a protruding rib, which extends in the axial direction of the mounting shaft 21. The shape of the bead is not limited, for example, the bead is arcuate in cross section along the mounting shaft 21, or has a smoothly transition structure so as not to affect the rotation between the mounting shaft 21 and the stirring shaft 11. The line contact includes the bead contacting the other of the shaft hole side surface and the mounting shaft side surface. In the case where the mounting shaft side surface 211 is in line contact with the shaft hole side surface 112 via a bead, the mounting shaft top surface 212 and the shaft hole top surface 113 may have an arch and a plane structure as described later.

By arranging the ribs, the ribs extend along the axial direction of the mounting shaft 21, and the ribs are used for enabling a part of the shaft holes 111 to be in surface contact with the mounting shaft 21, and the other part of the shaft holes are spaced, friction heating between the stirring shaft and the mounting shaft is reduced, noise is reduced, and abnormal sound risk is reduced.

With continued reference to fig. 5, 7, 8 and 9, in the first stirring assembly, the second stirring assembly and the third stirring assembly, the cross section of the shaft hole 111 along the stirring shaft 11 is polygonal, fig. 5 and 6 illustrate that the polygon is a regular hexagon, fig. 7 illustrates that the polygon is a regular pentagon, and fig. 8 illustrates that the polygon is a regular tetragon. The skilled person will appreciate that the polygon may not be a regular polygon as shown based on the concept that the stirring shaft 11 and the shaft hole 111 pass through an inscribed circle or an circumscribed circle. The mounting shaft 21 is circular in cross section along the mounting shaft 21.

As an alternative to the above embodiment, the shaft hole 111 has a circular cross section along the stirring shaft 11, and the mounting shaft 21 has a polygonal cross section along the mounting shaft 21.

As set forth above, whether the shaft hole 111 is polygonal along the cross section of the stirring shaft 11, the mounting shaft 21 is circular along the cross section of the mounting shaft 21, or the shaft hole 111 is circular along the cross section of the stirring shaft 11, the mounting shaft 21 is polygonal along the cross section of the mounting shaft 21, which is advantageous for reducing the contact area when rotating in cooperation with each other, thereby being advantageous for reducing one or more of frictional heating between the stirring shaft 11 and the mounting shaft 21, reducing noise and reducing risk of abnormal sound. In comparison, the shaft hole 111 is polygonal along the cross section of the stirring shaft 11, and the cross section of the mounting shaft 21 along the mounting shaft 21 is circular, which is more beneficial to manufacturing the mounting shaft 21 or the stirring shaft 11, for example, when the cross section of the mounting shaft 21 along the mounting shaft 21 is polygonal, the manufacturing of the mounting shaft 21 is inconvenient. In the case where one of the shaft hole 111 and the mounting shaft 21 has a polygonal cross section and the other has a circular cross section, the shaft hole top surface 113 of the shaft hole 111 and the mounting shaft top surface 212 of the mounting shaft 21 may have the arch and plane structures described above.

Referring to fig. 5, 6, 8 and 9, the polygon is a regular polygon.

As set forth above, the polygon is a regular polygon, which is advantageous in reducing friction heat generation between the stirring shaft 11 and the mounting shaft 21, reducing noise, and reducing one or more of risks of abnormal sound.

Referring to fig. 5, 6, 8 and 9, fig. 5 and 6 illustrate that the polygon is a regular hexagon, fig. 8 illustrates that the polygon is a regular pentagon, and fig. 9 illustrates that the polygon is a regular tetragon, so that a skilled person can understand that the number of sides of the regular polygon may be changed, and in the embodiment of the present application, the number of sides of the regular polygon is 3-8.

As described above, the number of sides of the regular polygon is 3 to 8, and the shaft hole 111 of the stirring shaft 11 and the mounting shaft 21 are easy to manufacture, and the manufacturing accuracy can be ensured, so that the friction heating between the stirring shaft 11 and the mounting shaft 21 is reduced, and the noise is reduced, and the risk of abnormal noise is reduced, while the friction heating between the stirring shaft 11 and the mounting shaft 21 is reduced.

Referring to fig. 7, the inner surface of the shaft hole 111 includes a shaft hole top surface 113 connected to the shaft hole side surface 112, the surface of the mounting shaft 21 includes a mounting shaft top surface 212 connected to the mounting shaft side surface 211, and the line contact includes that the shaft hole top surface 113 is tangential to the mounting shaft top surface 212.

As set forth above, the shaft hole top surface 113 is tangent to the mounting shaft top surface 212, and the shaft hole side surface 112 is tangent to the mounting shaft side surface 211, so that the contact area between the mounting shaft 21 and the shaft hole 111 is smaller, which is beneficial to reducing friction heating between the stirring shaft 11 and the mounting shaft 21, reducing noise and reducing one or more of risks of abnormal sound.

There are various embodiments of tangency, and more than one tangency point may be used, in embodiments of the present application, one tangency point. The following is described in connection with fig. 7: the top surface 113 of the shaft hole protrudes toward the mounting shaft 21 to form an arch, and the arch may be a spherical crown or the like. The mounting shaft top surface 212 is planar. As an alternative to the embodiment shown in fig. 7, the shaft hole top surface 113 is a plane, and the mounting shaft top surface 212 protrudes toward the shaft hole top surface 113 to have an arch shape.

As set forth above, the mounting shaft 21 and the shaft hole 111 are each simple in structure and are more advantageous in reducing the contact area by combining the arch with the plane, and further, in reducing frictional heat between the stirring shaft 11 and the mounting shaft 21, reducing noise and reducing one or more of risks of abnormal sound.

Referring to fig. 10, the inner surface of the shaft hole 111 protrudes toward the mounting shaft 21 to form a plurality of spaced protrusions 114, that is, the surface of the protrusions 114 is a portion of the inner surface of the shaft hole 111. The shaft hole is in point contact with the mounting shaft 21 through the bump 114 to achieve the partial surface contact, and the other partial surface is spaced apart. Of course, as an alternative to the above embodiment, a plurality of the protruding points 114 may be formed so that the surface of the mounting shaft 21 protrudes toward the surface of the shaft hole 111 at intervals, and in this case, the surface of the protruding point 114 may be a part of the surface of the mounting shaft 21. Although three bumps 114 are illustrated in fig. 10, the skilled artisan will appreciate that the number of bumps 114 is not limited. The bump 114 may be disposed between the shaft hole side surface 112 and the mounting shaft side surface 211, and may be disposed between the shaft hole top surface 113 and the mounting shaft top surface 212. Of course, the protruding point 114 may be provided between the shaft hole side surface 112 and the mounting shaft side surface 211, but the mounting shaft top surface 212 and the shaft hole top surface 113 may have the arch-shaped and plane structure.

As the protruding points 114 are arranged, the shaft hole 111 and the mounting shaft 21 are in point contact through the protruding points 114, so that the contact area between the shaft hole 111 and the mounting shaft 21 is reduced by point contact, friction heating between the stirring shaft 11 and the mounting shaft 21 is reduced, and one or more of noise and abnormal noise risk are reduced.

With continued reference to fig. 10, the bump 114 is spherical.

As set forth above, the bump 114 is spherical in shape, and on the premise of ensuring that friction heating between the stirring shaft 11 and the mounting shaft 21 is reduced, noise is reduced, and abnormal noise risk is reduced, because the spherical surface is smooth, the stirring shaft 11 and the mounting shaft 21 rotate more smoothly.

Referring to fig. 4, the stirring cup may be one, in this embodiment of the present application, the stirring cup includes a first stirring cup 2 and a second stirring cup 5, the first stirring cup 2 and the second stirring cup 5 are respectively provided with the mounting shaft 21, and the material of the first stirring cup 2 is different from the material of the second stirring cup 5.

As set forth above, due to the fact that a part of the surface contacts between the mounting shaft 21 and the shaft hole 111 and the other part of the surface is spaced, the contact area is reduced, and when the same stirring assembly is matched with different stirring cups (for example, the first stirring cup 2 and the second stirring cup 5), friction heating between the stirring shaft 11 and the mounting shaft 21 is reduced, noise is reduced, and abnormal noise risk is reduced, or one or more of noise and abnormal noise risk is reduced, because the cross section of the mounting shaft 21 along the mounting shaft 21 is circular, and the cross section of the shaft hole 111 along the stirring shaft 11 is circular, due to the limitation of manufacturing/technology level, the mounting shaft 21 and the shaft hole 111 cannot be completely coaxial, the shaft hole 111 cannot be completely guaranteed to be circular, and the contact area is large due to the matching of the two, or one or more of serious heating, obvious noise and abnormal noise risk are generated.

The foregoing description of the preferred embodiments of the present application is not intended to limit the utility model to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and scope of the utility model.

Claims (10)

1. The food processor is characterized by comprising a stirring assembly (1), a stirring cup and a main machine (3), wherein the stirring assembly (1) comprises a stirring shaft (11), the stirring shaft (11) is provided with a shaft hole (111), and the shaft hole (111) extends along the axial direction of the stirring shaft (11); the bottom of the stirring cup is provided with a mounting shaft (21);

the mounting shaft (21) is inserted into the shaft hole (111), and one part of the surface of the mounting shaft (21) is contacted with the shaft hole (111), and the other part of the surface is spaced;

the motor of the host machine (3) drives the stirring shaft (11) to rotate around the mounting shaft (21) to drive the stirring assembly (1) to rotate in the stirring cup.

2. The food processor according to claim 1, wherein the mounting shaft (21) is in line contact with an inner surface of the shaft hole (111) to achieve the partial surface contact, and the other partial surface is spaced apart.

3. The food processor according to claim 2, wherein an inner surface of the shaft hole (111) comprises a shaft hole side (112), a surface of the mounting shaft (21) comprises a mounting shaft side (211), and the line contact comprises the mounting shaft side (211) being tangential to the shaft hole side (112);

alternatively, one of the mounting shaft side surface (211) and the shaft hole side surface (112) protrudes toward the other to form a bead, the bead extending in the axial direction of the mounting shaft (21), and the line contact includes the bead contacting the other of the shaft hole side surface (112) and the mounting shaft side surface (211).

4. A machine according to claim 3, wherein the inner surface of the shaft hole (111) comprises a shaft hole top surface (113) connected to the shaft hole side surface (112), the surface of the mounting shaft (21) comprises a mounting shaft top surface (212) connected to the mounting shaft side surface (211), and the line contact further comprises that the shaft hole top surface (113) is tangential to the mounting shaft top surface (212).

5. The food processor according to claim 1, wherein one of the shaft hole (111) and the mounting shaft (21) has a polygonal cross section and the other has a circular cross section.

6. The food processor according to claim 4 or 5, wherein the shaft hole (111) comprises a shaft hole top surface (113), the mounting shaft (21) comprises a mounting shaft top surface (212), the shaft hole top surface (113) protrudes to the mounting shaft (21) to be arched, the mounting shaft top surface (212) is a plane, or the shaft hole top surface (113) is a plane, and the mounting shaft top surface (212) protrudes to the shaft hole top surface (113) to be arched.

7. The food processor of claim 5, wherein the polygon is a regular polygon.

8. The food processor according to claim 1, wherein one of an inner surface of the shaft hole (111) and a surface of the mounting shaft (21) protrudes toward the other to form a plurality of spaced bumps (114), and the shaft hole (111) and the mounting shaft (21) are in point contact through the bumps to achieve the partial surface contact, and the other partial surface is spaced.

9. The food processor according to claim 8, wherein the bumps (114) are spherical crowns.

10. The food processor according to claim 1, wherein the stirring cup comprises a first stirring cup (2) and a second stirring cup (5), the first stirring cup (2) and the second stirring cup (5) are respectively provided with the mounting shaft (21), and the material of the first stirring cup (2) is different from the material of the second stirring cup (5).