Stably-connected food processor

Abstract

The utility model belongs to the technical field of food processing devices, and discloses a stably-connected food processor which comprises a main machine with a built-in motor and a stirring cup detachably mounted above the main machine, a stirring cutter is arranged at the bottom of the stirring cup, an upper connector is mounted at the lower end of a cutter shaft, and a lower connector is connected to the upper end of a motor shaft. The center of the upper connector is provided with a positioning column protruding downwards and driven teeth, the driven teeth are connected to the periphery of the positioning column, the lower end of the positioning column protrudes out of the driven teeth, the lower connector is provided with a positioning groove and driving teeth arranged in the circumferential direction of the positioning groove, the driving teeth are in transmission fit with the driven teeth, and the lower end of the positioning column is inserted into the positioning groove. Through reliable insertion connection of the positioning column and the positioning groove, centering guiding of the upper connector and the lower connector is achieved, meanwhile, the radial limiting effect is achieved, the centering and concentricity of the upper connector and the lower connector is improved, and working noise caused by swinging of the connectors or shaking of a stirring cutter is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of food processing devices, and in particular relates to a food processing machine with stable connection. Background Art

[0002] Existing wall breaking machines generally include a main unit and a cup body detachably mounted on the main unit. For example, patent application number 202320441583.6 discloses a food processing machine with reliable transmission. The main unit is provided with a motor, and the cup body assembly is provided with a crushing knife. A lower connector is installed at the upper end of the motor shaft, and an upper connector is installed at the lower end of the knife shaft. The upper connector and the lower connector are plugged together to connect the motor to the crushing knife. However, in this food processing machine, there are many dimensional chains after the cup body is installed on the main unit. Due to the superposition of the assembly relationships of each layer, the concentricity of the knife shaft and the motor shaft is poor. The machine is prone to problems such as connector wear, loud noise, and shaking of the food processor during operation, which affects the working stability of the food processor.

[0003] There are also some technologies used to solve the problem of concentricity of transmission connection. For example, the patent with application number 202320063860.4 discloses a food processor transmission structure, including: a coupling and a spline shaft, the coupling has a plurality of first conical transverse guide teeth, the spline shaft is formed with a plurality of second conical transverse guide teeth meshing with the first conical transverse guide teeth, a positioning column is formed on the end face of the spline shaft, a positioning hole is formed on the end face of the coupling facing the spline shaft, the first conical transverse guide teeth are arranged around the circumference of the positioning hole, and the positioning column is inserted in the positioning hole. However, in this scheme, the positioning column and the second conical transverse guide tooth are independently arranged, the structural strength of the positioning column is low, and the positioning hole is directly opened on the end face of the coupling and is directly formed by the first conical transverse guide tooth. Therefore, during the transmission process, the connection reliability between the positioning column and the positioning hole is poor, and the positioning effect of the positioning hole is poor. When layer-by-layer assembly is required to achieve reliable transmission, it is difficult to ensure the concentricity between the components, resulting in poor coaxiality between the motor shaft and the knife shaft of the food processor, causing the food processor to shake during operation and bring about a large working noise problem. Utility Model Content

[0004] The utility model provides a food processing machine with stable connection, which solves the problem that the motor shaft and the knife shaft in the existing food processing machine need to be assembled layer by layer with connecting heads, resulting in unreliable positioning and poor concentricity between the motor shaft and the knife shaft, so as to further solve the problem of high working noise of the whole machine.

[0005] The technical solution adopted by the utility model is:

[0006] The utility model provides a food processing machine with stable connection, comprising a main unit with a built-in motor and a stirring cup detachably mounted above the main unit, wherein a stirring knife is arranged at the bottom of the stirring cup, an upper connecting head is mounted at the lower end of the knife shaft of the stirring knife, a lower connecting head is connected to the upper end of the motor shaft of the motor, a downwardly protruding positioning column and a driven tooth are arranged at the center of the upper connecting head, the driven tooth is connected to the outer periphery of the positioning column, the lower end of the positioning column protrudes from the driven tooth, the lower connecting head is provided with a positioning groove and a driving tooth arranged along the circumference of the positioning groove, the driving tooth is matched with the driven tooth in transmission, and the lower end of the positioning column is inserted into the positioning groove.

[0007] The food processing machine provided by the utility model is provided with a downwardly protruding positioning column and a driven tooth through the center of the upper connecting head, and the driving tooth cooperates with the driven tooth to realize effective transmission between the motor shaft and the stirring blade. At the same time, the lower end of the positioning column protrudes from the driven tooth to be inserted into the positioning groove of the lower connecting head. On the one hand, during the installation of the stirring cup, the centering guidance of the upper connecting head and the lower connecting head is realized, which facilitates the centering installation of the upper connecting head and the lower connecting head and the effective meshing between the driving tooth and the driven tooth. On the other hand, during the operation of the motor, the positioning column and the positioning groove cooperate to achieve the effect of radial limiting. When the motor shaft rotates at a high speed, the centering and concentricity of the upper connecting head and the lower connecting head are improved, and the working noise caused by the swing of the connecting head or the shaking of the stirring blade is reduced. At the same time, since the driven teeth are connected to the outer periphery of the positioning column and the driving teeth are arranged along the circumference of the positioning groove, the driven teeth have a structural reinforcement effect on the positioning column, and the driving teeth have a reinforcement effect on the strength of the positioning groove, so as to improve the reliability of positioning between the positioning column and the positioning groove, and further ensure the radial limiting effect between the positioning column and the positioning groove, so that the upper connecting head and the lower connecting head are aligned, the motor shaft and the stirring blade are aligned, thereby realizing the alignment of the stirring cup and the main machine, so as to reduce the working noise of the whole machine.

[0008] In a preferred embodiment, the lower connector is penetrated by a fixing hole for fixing the motor shaft and an upper ring wall extending upward around the fixing hole, the driving tooth is located on the outer side of the upper ring wall, and the upper ring wall encloses the positioning groove.

[0009] The upper ring wall extends upward around the fixing hole and forms a positioning groove at the same time. The height of the upper ring wall extending upward determines the groove depth of the positioning groove. Therefore, the groove depth of the positioning groove can be deepened as much as possible without thickening the horizontal end surface of the lower connector, thereby improving the centering effect and connection reliability between the positioning column and the positioning groove. The driving teeth are located on the outside of the upper ring wall, so that the driving teeth play a transmission role alone, and the upper ring wall plays a radial limiting role between the positioning column alone. Therefore, the limiting effect of the upper ring wall on the positioning column and the transmission effect between the driving teeth and the driven teeth are simultaneously improved, and the structure is reliable. The upper ring wall is used to enclose the positioning groove, and the positioning column is fully limited along the circumference of the positioning column. The limiting is reliable, which further improves the centering between the upper connector and the lower connector, which is conducive to reducing the working noise of the whole machine.

[0010] In a preferred embodiment, the lower connector is further provided with a lower annular wall extending downwardly around the fixing hole, and the motor shaft is inserted and fixed in the lower annular wall.

[0011] By arranging a lower ring wall extending downward on the lower connector, the motor shaft is inserted into the lower ring wall to achieve radial limitation. On the basis of fixing the lower connector and the motor shaft, the concentricity between the lower connector and the motor shaft can be improved. At the same time, the lower ring wall and the upper ring wall together around the fixing hole structure reinforce the position of the fixing hole, so that the coaxiality between the motor shaft and the positioning column is reliably improved, thereby improving the concentricity between the upper connector and the lower connector.

[0012] In a preferred embodiment, a screw is further included, wherein the screw passes through the fixing hole and is locked to the motor shaft, and the nut of the screw is sunk into the positioning groove.

[0013] The screw is passed through the fixing hole and locked to the motor shaft, so that the lower connecting head is fixedly installed on the upper end of the motor shaft, thereby realizing reliable transmission between the motor shaft and the lower connecting head, and the nut of the screw sinks into the positioning groove. Therefore, the screw and the positioning column share the positioning groove to realize radial limitation, and when the positioning column is inserted into the positioning groove, it can be reliably aligned with the screw, thereby further improving the alignment between the lower connecting head, the motor shaft, the screw, the positioning column, the upper connecting head and the knife shaft. Although there are layers of assembly between the knife shaft and the motor shaft, the alignment after assembly can still be guaranteed, thereby reducing the collision noise between the components during operation.

[0014] In a preferred embodiment, the positioning column is a through-type hollow column, and the knife shaft is inserted and fixed in the positioning column.

[0015] By setting the positioning column as a hollow column, a plug-in space is provided for the tool shaft, and the tool shaft is inserted into the positioning shaft from above the positioning column, thereby strengthening the structural strength of the positioning column and realizing a reliable connection with the positioning column. At the same time, the lower end of the positioning column is inserted into the positioning groove to realize a reliable plug-in with the positioning groove, further improving the alignment between the positioning column, the tool shaft and the positioning groove. In addition, during the processing of the upper connector, the hollow column is used to reduce the weight of the upper connector, reduce the load on the motor drive, and reduce working noise.

[0016] In a preferred embodiment, the inner side of the positioning column is provided with an internal thread, and the knife shaft is provided with an external thread matching the internal thread;

[0017] Alternatively, the knife shaft and the positioning column are flatly matched.

[0018] By providing an internal thread on the inner side of the positioning column and an external thread on the knife shaft to achieve a threaded connection between the knife shaft and the positioning column, a reliable connection can be achieved without the aid of a screw fixing, the connection structure is simplified, and reliable transmission is achieved. By using the flat position of the knife shaft and the positioning column to cooperate, the rotation limit between the knife shaft and the positioning column after plugging and fixing is achieved, so that the two can be transmitted reliably and the structure is simple.

[0019] In a preferred embodiment, the positioning column includes a main body section and a positioning section connected to the main body section, the positioning section is contracted relative to the outer diameter of the main body section, the driven tooth is connected to the outer periphery of the main body section, and the positioning section is inserted into the positioning groove.

[0020] By providing a main body section and a positioning section connected to the main body section, the driven teeth are connected to the outer periphery of the main body section. On the basis of utilizing the main body section to maintain the overall structural strength and achieve a reliable connection with the knife shaft, the positioning section shrinks relative to the outer diameter of the main body section, so that the positioning section can be inserted into the positioning groove when the user installs the blender cup, which is convenient and labor-saving for the user to operate.

[0021] In a preferred embodiment, a rounded arc surface with a gradually shrinking outer diameter is provided at the lower end of the positioning column.

[0022] By providing a gradually shrinking rounded arc surface on the lower end face of the positioning column, the positioning column can be guided to be accurately centered in the positioning groove compared to cutting the lower end face flat, thereby avoiding the positioning column being placed on the upper end of the notch of the positioning groove during installation, which makes the installation and alignment of the mixing cup difficult. This allows the user to insert the positioning section into the positioning groove during the installation of the mixing cup, which is convenient and labor-saving for the user to operate.

[0023] In a preferred embodiment, the driving tooth comprises a first driving surface and a second driving surface which are arranged opposite to each other, the first driving surface and the second driving surface both extend vertically, and the motor drives the driven tooth to rotate through the first driving surface and the second driving surface respectively when the motor rotates forward and reversely;

[0024] Alternatively, the driving tooth comprises a third driving surface extending vertically and an inclined guide surface, and the top end of the guide surface is connected to the top end of the third driving surface and extends downwardly in an inclined manner.

[0025] The driving teeth include a first driving surface and a second driving surface, both of which extend vertically, so that the driving teeth and the driven teeth can be reliably transmitted when the motor rotates forward and reversely, so as to be suitable for a variety of usage scenarios. For example, it can meet the different needs of fine crushing when the motor rotates forward and coarse particle grinding when the motor rotates reversely, and has a wide range of applications.

[0026] By setting the driving teeth as a vertically extending third driving surface and an inclined guide surface, the top end of the guide surface is connected to the top end of the third driving surface and extends downwardly obliquely. When the user installs the blending cup from top to bottom, after the driven teeth of the upper connector touch the top end of the driving teeth of the lower connector, the lower connector and the upper connector can be adaptively rotated under the guidance of the guide surface to form a self-rotational alignment, so that the upper connector can be accurately plugged into the lower connector to achieve transmission connection, which is convenient for the user to install the blending cup.

[0027] In a preferred embodiment, a soft rubber head is arranged between the lower connecting head and the upper connecting head.

[0028] By arranging a soft rubber head between the lower connecting head and the upper connecting head, the soft rubber head can absorb certain vibrations and reduce noise during the transmission process between the lower connecting head and the upper connecting head. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0030] Figure 1 This is a schematic cross-sectional structure diagram of a food processing machine in one embodiment of the utility model;

[0031] Figure 2 for Figure 1 A partial enlarged view of the middle A part;

[0032] Figure 3 This is an exploded schematic diagram of the assembly structure of the stirring blade and the motor in one embodiment of the utility model;

[0033] Figure 4This is a schematic diagram of the cross-sectional structure of an upper connector in one embodiment of the utility model;

[0034] Figure 5 This is a structural diagram of an inverted upper connector in one embodiment of the utility model;

[0035] Figure 6 This is a schematic diagram of the cross-sectional structure of the lower connector in one embodiment of the utility model;

[0036] Figure 7 The figure is a schematic cross-sectional structure diagram of a lower connector in another embodiment of the present invention.

[0037] Explanation of the reference numerals: 11, motor; 12, motor shaft; 10, main unit; 20, stirring cup; 21, stirring blade; 22, blade shaft; 30, upper connector; 31, positioning column; 311, main body section; 312, positioning section; 313, rounded arc surface; 32, driven tooth; 40, lower connector; 41, positioning groove; 42, driving tooth; 421, first driving surface; 422, second driving surface; 423, third driving surface; 424, guide surface; 43, fixing hole; 44, upper ring wall; 45, lower ring wall; 50, screw; 60, soft rubber head. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in the form of examples in conjunction with the accompanying drawings.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present invention and the features in each embodiment may be combined with each other without conflict.

[0040] In addition, in the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0043] like Figure 1 , Figure 2 , Figure 3 As shown, the utility model provides a food processor with stable connection in one embodiment, including a main unit 10 with a built-in motor 11 and a mixing cup 20 detachably mounted on the main unit 10, a mixing knife 21 is disposed at the bottom of the mixing cup 20, a lower end of a knife shaft 22 of the mixing knife 21 passes through the bottom wall of the mixing cup and is mounted with an upper connector 30, and an upper end of a motor shaft 12 of the motor 11 is connected with a lower connector 40, as shown in FIG. Figure 4 , Figure 5 As shown, the center of the upper connector 30 is provided with a downwardly protruding positioning column 31 and a driven tooth 32, the driven tooth 32 is connected to the outer periphery of the positioning column 31, and the lower end of the positioning column 31 protrudes from the driven tooth 32, as shown in FIG. Figure 3 and Figure 6 As shown, the lower connector 40 is provided with a positioning groove 41 and driving teeth 42 arranged along the circumference of the positioning groove 41 . The driving teeth 42 are in transmission cooperation with the driven teeth 32 . The lower end of the positioning column 31 is inserted into the positioning groove 41 .

[0044] like Figure 1-6As shown, the food processing machine provided by the utility model is provided with a downwardly protruding positioning column 31 and a driven tooth 32 through the center of the upper connecting head 30, and the driving tooth 42 cooperates with the driven tooth 32 to realize effective transmission between the motor shaft 12 and the mixing blade 21. At the same time, the lower end of the positioning column 31 protrudes from the driven tooth 32 to be inserted into the positioning groove 41 of the lower connecting head 40. On the one hand, during the installation of the mixing cup 20, the centering guidance of the upper connecting head 30 and the lower connecting head 40 is realized, which facilitates the centering installation of the upper connecting head 30 and the lower connecting head 40 and the effective meshing between the driving tooth 42 and the driven tooth 32. On the other hand, during the operation of the motor 11, the positioning column 31 and the positioning groove 41 cooperate to achieve the effect of radial limiting. When the motor shaft 12 rotates at a high speed, the centering and concentricity of the upper connecting head 30 and the lower connecting head 40 are improved, and the working noise caused by the swing of the connecting head part or the shaking of the mixing blade 21 is reduced. At the same time, since the driven teeth 32 are connected to the outer periphery of the positioning column 31 and the driving teeth 42 are arranged along the circumference of the positioning groove 41, the driven teeth 32 have a structural reinforcement effect on the positioning column 31, and the driving teeth 42 have a reinforcement effect on the strength of the positioning groove 41, so as to improve the reliability of positioning between the positioning column 31 and the positioning groove 41, so as to further ensure the radial limiting effect between the positioning column 31 and the positioning groove 41, so that the upper connecting head 30 and the lower connecting head 40 are aligned, and the motor shaft 12 and the stirring blade 21 are aligned, thereby realizing the alignment of the stirring cup 20 and the main unit 10, so as to reduce the working noise of the whole machine.

[0045] In a preferred embodiment, Figure 6 As shown, the lower connector 40 is penetrated by a fixing hole 43 for fixing the motor shaft 12 and an upper ring wall 44 extending upward around the fixing hole 43 . The driving teeth 42 are located on the outer side of the upper ring wall 44 , and the upper ring wall 44 encloses a positioning groove 41 .

[0046] More preferably, if Figure 6 As shown, the lower connector 40 is further provided with a lower annular wall 45 extending downwardly around the fixing hole 43 , and the motor shaft 12 is inserted and fixed in the lower annular wall 45 .

[0047] In this embodiment, the specific fixing method of the motor shaft 12 and the fixing hole 43 is not limited. For example, Figure 2 , Figure 3 As shown, the food processor further comprises a screw 50 , which passes through the fixing hole 43 and is locked to the motor shaft 12 , wherein a nut 51 of the screw 50 is sunk into the positioning groove 41 .

[0048] like Figure 6As shown, the upper annular wall 44 extends upward around the fixing hole 43 and forms the positioning groove 41 at the same time. The height of the upper annular wall 44 extending upward determines the groove depth of the positioning groove 41. Therefore, the groove depth of the positioning groove 41 can be deepened as much as possible without thickening the horizontal end surface of the lower connector, thereby improving the centering effect and connection reliability between the positioning column 31 and the positioning groove 41. The driving tooth 42 is located on the outer side of the upper annular wall 44, so that the driving tooth 42 plays a transmission role alone, and the upper annular wall 44 plays a radial limiting role between the positioning column 31 alone. Therefore, the limiting effect of the upper annular wall 44 on the positioning column 31 and the transmission effect between the driving tooth 42 and the driven tooth 32 are simultaneously improved, and the structure is reliable. The upper annular wall 44 is used to enclose the positioning groove 41, and the positioning column 31 is fully limited along the circumference of the positioning column 31. The limiting is reliable, which further improves the centering between the upper connector 30 and the lower connector 40, which is conducive to reducing the working noise of the whole machine.

[0049] By providing a lower annular wall 45 extending downward on the lower connector 40, the motor shaft 12 is inserted into the lower annular wall 45 to achieve radial limitation. On the basis of fixing the lower connector 40 and the motor shaft 12, the concentricity between the lower connector 40 and the motor shaft 12 can also be improved. At the same time, the lower annular wall 45 and the upper annular wall 44 surround the fixing hole 43 to structurally strengthen the position of the fixing hole 43, so that the coaxiality between the motor shaft 12 and the positioning column 31 is reliably improved, thereby improving the concentricity between the upper connector 30 and the lower connector 40.

[0050] In this embodiment, the screw 50 is passed through the fixing hole 43 to lock the motor shaft 12, so that the lower connecting head 40 is fixedly installed on the upper end of the motor shaft 12, thereby realizing reliable transmission between the motor shaft 12 and the lower connecting head 40, and can effectively avoid the problem that the user takes away the lower connecting head 40 when removing the mixing cup 20. The nut of the screw 50 sinks into the positioning groove 41. Therefore, the screw 50 and the positioning column 31 share the positioning groove 41 to realize radial limitation, and when the positioning column 31 is inserted into the positioning groove 41, it can be reliably aligned with the screw 50, thereby further improving the alignment between the lower connecting head 40, the motor shaft 12, the screw 50, the positioning column 31, the upper connecting head 30 and the knife shaft 22. Although there are layers of assembly between the knife shaft 22 and the motor shaft 12, the alignment after assembly can still be guaranteed, thereby reducing the collision noise between the components during operation.

[0051] It should be noted that, in fact, the fixing method between the lower connector and the motor shaft is not limited to the one mentioned above. In other preferred embodiments, the lower connector can be optionally interference fit or threadedly connected to the motor shaft. Therefore, when these two fixing methods are adopted, the fixing hole on the lower connector can be omitted, so that the bottom wall of the positioning groove is a closed structure.

[0052] Moreover, the lower ring wall can be omitted, and screws can be directly used to fix the motor shaft and the fixing hole, so that the lower connector can be reliably installed on the top end of the motor shaft.

[0053] In addition, it should be noted that, in fact, the positioning groove is not limited to being formed by enclosing the upper ring wall. For example, the positioning groove can be formed by being recessed on the upper surface of the horizontal end surface of the lower connector. In this way, it is only necessary to thicken the horizontal end surface of the lower connector to ensure the groove depth of the positioning groove, so as to improve the matching reliability between the positioning column and the positioning groove and achieve a good centering effect.

[0054] In a preferred embodiment, the positioning column 31 is a through-type hollow column, and the knife shaft 22 is plugged and fixed in the positioning column 31. More preferably, the inner side of the positioning column 31 is provided with an internal thread, and the knife shaft 22 is provided with an external thread that matches the internal thread. By setting the positioning column 31 as a hollow column, a plug-in space is provided for the knife shaft 22, and the knife shaft 22 is inserted into the positioning shaft from above the positioning column 31, thereby strengthening the structural strength of the positioning column 31 and achieving a reliable connection with the positioning column 31. At the same time, the lower end of the positioning column 31 is inserted into the positioning groove 41 to achieve a reliable plug-in with the positioning groove 41, further improving the alignment between the positioning column 31, the knife shaft 22, and the positioning groove 41, and in the processing process of the upper connector 30, the hollow column is used to reduce the weight of the upper connector 30, reduce the load driven by the motor 11, and reduce working noise.

[0055] By providing an internal thread on the inner side of the positioning column 31 and an external thread on the knife shaft 22, a threaded connection between the knife shaft 22 and the positioning column 31 is achieved, which can achieve a reliable connection without the aid of a fixing member such as a screw 50, simplify the connection structure, and achieve reliable transmission.

[0056] In fact, the knife shaft 22 and the positioning column 31 can also be matched in a flat position to achieve plug-in and rotation limitation.

[0057] By utilizing the flat position cooperation between the knife shaft 22 and the positioning column 31, the rotation limit between the knife shaft 22 and the positioning column 31 is realized after being plugged and fixed, so that the two can be transmitted reliably and the structure is simple.

[0058] The present invention does not limit the structure of the positioning column. Figure 4 , Figure 5 As shown, in a preferred embodiment, the positioning column 31 includes a main body section 311 and a positioning section 312 connected to the main body section 311, the positioning section 312 is contracted relative to the outer diameter of the main body section 311, the driven tooth 32 is connected to the outer periphery of the main body section 311, and the positioning section 312 is inserted into the positioning groove 41.

[0059] By providing a main body section 311 and a positioning section 312 connected to the main body section 311, the driven teeth 32 are connected to the outer periphery of the main body section 311. On the basis of utilizing the main body section 311 to maintain the overall structural strength and achieve a reliable connection with the blade shaft 22, the positioning section 312 shrinks relative to the outer diameter of the main body section 311, so that the positioning section 312 can be inserted into the positioning groove 41 when the user installs the blender cup 20, which is convenient and labor-saving for the user to operate.

[0060] In fact, combined Figure 6 As a preferred method in this embodiment, since the positioning section 312 shrinks relative to the outer diameter of the main section 311, a step surface can be optionally formed between the positioning section 312 and the main section 311. Preferably, the lower connector 40 is penetrated by a fixing hole 43 for fixing the motor shaft 12 and an upper ring wall 44 extending upward around the fixing hole 43. The driving tooth 42 is located on the outer side of the upper ring wall 44, and the upper ring wall 44 encloses a positioning groove 41. With such an arrangement, after the upper connector and the lower connector are plugged in, the step surface can abut against the upper end of the upper ring wall, thereby realizing axial limitation between the upper connector and the lower connector, avoiding excessive insertion of the positioning column into the positioning groove, and the matching structure is reliable.

[0061] In a preferred embodiment, Figure 4 , Figure 5 As shown, the lower end of the positioning post 31 is provided with a rounded arc surface 313 with a gradually shrinking outer diameter.

[0062] By providing a gradually shrinking rounded arc surface 313 on the lower end surface of the positioning column 31, compared with cutting the lower end surface flat, the positioning column 31 can be guided to be accurately centered in the positioning groove 41, thereby avoiding the positioning column 31 being placed on the upper end of the notch of the positioning groove 41 during the installation process, which makes the installation and alignment of the blending cup 20 difficult, so that the positioning section 312 can be inserted into the positioning groove 41 during the user's installation of the blending cup 20, which is convenient and labor-saving for the user to operate.

[0063] In a preferred embodiment, Figure 2 , Figure 3 As shown, a soft rubber head 60 is arranged between the lower connector 40 and the upper connector 30. By arranging the soft rubber head 60 between the lower connector 40 and the upper connector 30, the soft rubber head 60 can absorb certain vibrations and reduce the noise during the transmission process of the lower connector 40 and the upper connector 30.

[0064] Optionally, the soft rubber head 60 may be detachably disposed between the lower connector 40 and the upper connector 30 , or the soft rubber head 60 may be fixed to one of the upper connector 30 and the lower connector 40 .

[0065] like Figure 1-6 As shown, the present invention does not limit the structure of the driving teeth. In a preferred embodiment, as shown in FIG. Figure 6As shown, the driving tooth 42 includes a third driving surface 423 extending vertically and an inclined guide surface 424 , and the top end of the guide surface 424 is connected to the top end of the third driving surface 423 and extends downwardly in an inclined manner.

[0066] By setting the driving teeth 42 as a vertically extending third driving surface 423 and an inclined guide surface 424, the top of the guide surface 424 is connected to the top of the third driving surface 423 and extends downwardly at an angle. When the user installs the blending cup 20 from top to bottom, after the driven teeth 32 of the upper connector 30 touch the top of the driving teeth 42 of the lower connector 40, the lower connector 40 and the upper connector 30 can be adaptively rotated under the guidance of the guide surface 424 to form a self-rotational alignment, so that the upper connector 30 can be accurately plugged into the lower connector 40 to achieve a transmission connection, which is convenient for the user to install the blending cup 20.

[0067] like Figure 7 As shown, in another preferred embodiment, the driving tooth 42 includes a first driving surface 421 and a second driving surface 422 that are oppositely arranged, and the first driving surface 421 and the second driving surface 422 both extend vertically. When the motor 11 rotates forward and reverse, the driven tooth 32 is driven to rotate through the first driving surface 421 and the second driving surface 422 respectively.

[0068] The driving teeth 42 include a first driving surface 421 and a second driving surface 422 and both extend vertically, so that the driving teeth 42 and the driven teeth 32 can be reliably transmitted when the motor 11 rotates forward and reversely, so as to be suitable for a variety of usage scenarios. For example, it can meet the different needs of fine crushing when the motor 11 rotates forward and coarse particle grinding when it rotates reversely, and has a wide range of applications.

[0069] Regardless of which of the above-mentioned drive teeth is used, the upper connecting head is preferably configured to extend vertically downward to form a vertical driven wall, referring to Figure 5 Therefore, the first driving surface 421 or the second driving surface 422 is used to drive the driven wall of the upper connector to achieve transmission; or, the third driving surface is used to drive the driven wall of the upper connector to achieve transmission.

[0070] The parts not described in the present invention can be realized by adopting or drawing on the existing technology.

[0071] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0072] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A food processor with stable connection, comprising a main unit with a built-in motor and a mixing cup detachably mounted on the main unit, wherein a mixing knife is provided at the bottom of the mixing cup, an upper connector is installed at the lower end of the knife shaft of the mixing knife, and a lower connector is connected to the upper end of the motor shaft of the motor, characterized in that: A downwardly protruding positioning column and a driven tooth are provided at the center of the upper connecting head. The driven tooth is connected to the outer periphery of the positioning column. The lower end of the positioning column protrudes from the driven tooth. The lower connecting head is provided with a positioning groove and a driving tooth arranged along the circumference of the positioning groove. The driving tooth is in transmission cooperation with the driven tooth. The lower end of the positioning column is inserted into the positioning groove.

2. A food processing machine with a stable connection according to claim 1, characterized in that: The lower connector is penetrated by a fixing hole for fixing the motor shaft and an upper ring wall extending upward around the fixing hole. The driving teeth are located on the outer side of the upper ring wall, and the upper ring wall encloses the positioning groove.

3. A food processing machine with a stable connection according to claim 2, characterized in that: The lower connector is also provided with a lower annular wall extending downward around the fixing hole, and the motor shaft is inserted and fixed in the lower annular wall.

4. A food processing machine with a stable connection according to claim 2 or 3, characterized in that: It also includes a screw, which passes through the fixing hole and is locked on the motor shaft, and the nut of the screw is sunk into the positioning groove.

5. A food processing machine with a stable connection according to claim 1, characterized in that: The positioning column is a through-type hollow column, and the knife shaft is inserted and fixed in the positioning column.

6. A food processing machine with a stable connection according to claim 5, characterized in that: The inner side of the positioning column is provided with an internal thread, and the knife shaft is provided with an external thread matching the internal thread; Alternatively, the knife shaft and the positioning column are flatly matched.

7. A food processing machine with a stable connection according to claim 1, characterized in that: The positioning column includes a main body section and a positioning section connected to the main body section, the positioning section is contracted relative to the outer diameter of the main body section, the driven teeth are connected to the outer periphery of the main body section, and the positioning section is inserted into the positioning groove.

8. The food processing machine with stable connection according to claim 1, characterized in that: The lower end of the positioning column is provided with a rounded arc surface with a gradually shrinking outer diameter.

9. The food processing machine with stable connection according to claim 1, characterized in that: The driving tooth comprises a first driving surface and a second driving surface which are arranged opposite to each other, the first driving surface and the second driving surface both extend vertically, and the driven tooth is driven to rotate by the first driving surface and the second driving surface respectively when the motor rotates forward and reversely; Alternatively, the driving tooth comprises a third driving surface extending vertically and an inclined guide surface, and the top end of the guide surface is connected to the top end of the third driving surface and extends downwardly in an inclined manner.

10. The food processing machine with stable connection according to claim 1, characterized in that: A soft rubber head is arranged between the lower connecting head and the upper connecting head.

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