Knife assembly and food processor

Abstract

The utility model relates to a knife assembly and a food processor. The cutter assembly comprises a cutter shaft and a cutter rest. The cutter shaft is provided with a connector used for being connected with a motor shaft. A blade is arranged on the knife rest, a vertically-through containing cavity is formed in the knife rest, the knife shaft can move in the containing cavity in the axial direction of the knife shaft, an elastic piece is further arranged in the containing cavity, the elastic piece can be telescopically deformed in the axial direction of the knife shaft, and the knife shaft is configured in the mode that the elastic piece can stretch out and draw back in the axial direction of the knife shaft. When the cutter assembly is taken out of the stirring bowl, the connector can retract into the containing cavity under the action of the elastic piece, and when the cutter assembly is installed in the stirring bowl, the bottom end of the cutter shaft is supported by a bowl shaft located at the bottom of the stirring bowl. And the knife rest overcomes the elastic force of the elastic piece to move downwards under the action of the gravity of the knife rest, so that the connector extends out of the accommodating cavity sleeve. The potential safety hazard of the knife assembly is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of small household appliances, and more specifically, to a knife assembly and a cooking machine. Background Art

[0002] For some cooking machines, taking a meat grinder as an example, the connecting head of the knife assembly is always in a protruding state. When the user accidentally installs the knife assembly on the main body outside the bowl, starting the main body can also drive the knife assembly to rotate, which poses a relatively large safety hazard and a risk of injury. Summary of the Invention

[0003] The present application provides a knife assembly and a cooking machine, which can eliminate the safety hazard of the knife assembly.

[0004] A knife assembly includes:

[0005] A knife shaft, at the top of which there is a connecting head for engaging with the motor shaft in the machine head;

[0006] A knife holder, on which there are blades. Inside the knife holder, there is an accommodation cavity that penetrates up and down. The knife shaft can move axially in the accommodation cavity. An elastic member is also provided in the accommodation cavity, and the elastic member can be telescopically deformed axially along the knife shaft. The knife shaft is configured such that when the knife assembly is taken out of the mixing bowl, the connecting head can be retracted into the accommodation cavity under the action of the elastic member. When the knife assembly is installed in the mixing bowl, the bottom end of the knife shaft is supported by a bowl shaft at the bottom of the mixing bowl, and the knife holder moves downward against the elastic force of the elastic member under its own gravity, so that the connecting head extends out of the accommodation cavity.

[0007] In the present application, when the knife assembly is taken out of the mixing bowl, the connecting head is retracted into the accommodation cavity by means of the elastic force of the elastic member. In this way, since the connecting head is partially or completely retracted into the accommodation cavity of the knife holder and cannot engage with the motor shaft of the main body, the safety hazard of the knife assembly rotating and injuring people outside the mixing bowl is eliminated. In addition, when the knife assembly is installed in the mixing bowl, the knife holder moves downward by overcoming the elastic force of the elastic member due to its own weight, so that the connecting head can extend out of the accommodation cavity, ensuring reliable engagement between the connecting head and the motor shaft in the machine head.

[0008] Optionally, the self-gravity of the knife holder is greater than the elastic force of the elastic member. This enables the knife assembly to move downward by overcoming the elastic force of the elastic member due to its own gravity after being installed in the mixing bowl, so that the connecting head extends out of the accommodation cavity, ensuring normal engagement between the connecting head and the motor shaft in the machine head, and thus driving the knife assembly to rotate.

[0009] Optionally, the self-gravity of the cutter shaft is less than the elastic force of the elastic member. Therefore, the elastic force of the elastic member can retract the cutter shaft into the accommodation cavity. When the cutter assembly is inverted, the self-gravity of the cutter shaft cannot overcome the elastic force of the elastic member to expose the connector from the accommodation cavity, thereby ensuring that the connector cannot engage with the motor shaft and eliminating the safety risk of the cutter assembly rotating outside the mixing bowl and injuring people.

[0010] Optionally, a first step surface is provided on the inner wall of the accommodation cavity, a second step surface is provided on the outer surface of the cutter shaft, the second step surface is located below the first step surface, and the elastic member is clamped between the first step surface and the second step surface. With this arrangement, the elastic member is pre-tightened between the first step surface and the second step surface. Without external force, the restoring force of the elastic member can drive the cutter shaft to retract into the accommodation cavity and remain in the retracted state.

[0011] Optionally, the cutter assembly further includes a cutter shaft cover disposed in the accommodation cavity. A third step surface is further provided on the inner wall of the accommodation cavity, the third step surface is located below the first step surface, the second step surface is located between the first step surface and the third step surface. A radially protruding annular flange is further provided on the outer surface of the cutter shaft, the annular flange is located below the third step surface and above the cutter shaft cover, and the annular flange abuts against the third step surface when the connector extends out of the accommodation cavity; the annular flange abuts against the cutter shaft cover when the connector retracts into the accommodation cavity. The cutter shaft cover provides a limit for the cutter shaft retracted into the accommodation cavity to limit the retraction distance of the cutter shaft. The annular flange can achieve the limit of the cutter shaft in both the extending and retracting directions, with a simple structure and reliable limit.

[0012] Optionally, the cutter shaft cover is provided with an axially penetrating through hole. The cutter shaft further includes a bowl shaft abutting section disposed below the annular flange. The bowl shaft abutting section is in clearance fit with the through hole and is used to contact the bowl shaft in the mixing bowl. The bowl shaft abutting section is arranged as a conical structure with a gradually decreasing cross-section from top to bottom. With this arrangement, the machining accuracy of the bowl shaft abutting section can be reduced, and it is easier for the bowl shaft abutting section to retract into the through hole when the cutter shaft retracts.

[0013] Optionally, the maximum distance that the connector extends out of the accommodating cavity is a, and the maximum distance between the third step surface and the tool shaft cover is b, wherein 0≤ba≤1mm. This can ensure the normal extension and retraction of the tool shaft. Optionally, the tool holder includes a main tool holder and an auxiliary tool holder, the main tool holder includes a main sleeve and a main blade arranged outside the main sleeve, the main sleeve is provided with the accommodating cavity inside, the auxiliary tool holder includes an auxiliary sleeve sleeved outside the main sleeve and an auxiliary blade connected to the outside of the auxiliary sleeve, the outer surface of the main sleeve is provided with an anti-slip portion protruding radially along the tool shaft, the anti-slip portion is located above the auxiliary tool holder, and the anti-slip portion is limitedly matched with the auxiliary tool holder along the axial direction of the tool shaft. The anti-slip portion is also used to limit the auxiliary tool holder from detaching from the main sleeve, and plays a role of axial limiting.

[0014] Optionally, the inner surface of the secondary sleeve is provided with a groove that is concave in the radial direction of the knife shaft, and the groove penetrates the bottom surface and the top surface of the secondary sleeve along the axial direction of the knife shaft, and is used to cooperate with the anti-slip portion when the secondary sleeve is installed in the main sleeve. When the secondary sleeve is installed in place, the anti-slip portion is located below the secondary sleeve and is staggered with the groove along the circumferential direction of the knife shaft. In this way, by providing a groove on the inner surface of the secondary sleeve, interference with the anti-slip portion can be avoided when installing the secondary tool holder, and the axial limitation of the secondary tool holder can be achieved by circumferential staggering, which has a simple structure and is easy to implement.

[0015] Optionally, the outer surface of the main sleeve is further provided with a transmission boss protruding radially along the knife shaft, and along the axial direction of the knife shaft, the anti-slip portion is closer to the connector than the transmission boss, and the groove includes a first groove and a second groove that are connected, the first groove is located above the second groove, and the size of the second groove along the circumference of the knife shaft is larger than the size of the first groove along the circumference of the knife shaft, and when the auxiliary sleeve is installed in place, the transmission boss is located in the second groove to be connected to the auxiliary sleeve in a transmission manner. With such an arrangement, the auxiliary tool holder can rotate around the center of the knife shaft below the anti-slip portion, and the auxiliary tool holder is connected in a transmission manner to the main tool holder by the cooperation of the transmission boss and the second groove, so that the auxiliary tool holder and the main tool holder can rotate synchronously.

[0016] Optionally, the main sleeve is configured as a stepped structure, including a main sleeve large end located at the bottom and a main sleeve small end located at the top, the main blade is connected to the main sleeve large end, the auxiliary tool holder is connected to the main sleeve small end, and the transmission boss extends to the stepped surface where the main sleeve large end and the main sleeve small end meet. The main sleeve with a stepped structure is also conducive to reducing the external dimensions of the auxiliary sleeve, making the tool holder more compact as a whole, and the stepped surface can also provide support for the auxiliary tool holder to ensure that the transmission boss is located in the groove.

[0017] A food processor, comprising:

[0018] The machine head includes a motor;

[0019] The mixing bowl is located below the machine head, and a bowl shaft is provided at the bottom of the mixing bowl;

[0020] For the knife assembly according to any one of the above, when the knife assembly is taken out of the mixing bowl, the connecting head retracts into the accommodating cavity; when the knife assembly is installed in the mixing bowl, the connecting head of the knife assembly extends out of the accommodating cavity and engages with the motor shaft of the motor, and the bowl shaft abuts against the lower end of the knife shaft. Description of the Drawings

[0021] Figure 1 is a cross-sectional view of a cooking machine shown in an exemplary embodiment of the present application;

[0022] Figure 2 is Figure 1 an exploded view of the knife assembly shown in;

[0023] Figure 3 is a cross-sectional view of the knife assembly, where the connecting head is in the extended state;

[0024] Figure 4 is a front view of the main knife holder;

[0025] Figure 5 is a cross-sectional view of the main knife holder;

[0026] Figure 6 is a front view of the knife shaft;

[0027] Figure 7 is a cross-sectional view of the knife assembly, where the connecting head is in the retracted state;

[0028] Figure 8 is a cross-sectional view of the knife assembly installed in the mixing bowl. Detailed Embodiments

[0029] Here, the technical solutions in the embodiments (or "embodiment modes") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description involves the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0030] If there are terms related to directional indication or positional relationship in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only for the purpose of convenient description and cannot be understood as indicating or implying relative importance.

[0031] Please refer to Figure 1 , Figure 1 which is a schematic diagram of a food processor 100 shown in an exemplary embodiment of the present application.

[0032] The present application provides a food processor 100, which includes but is not limited to a meat grinder. The food processor 100 includes a machine head 10, a mixing bowl 20, and a knife assembly 30. The machine head 10 is located above the mixing bowl 20. The machine head 10 includes a motor 11, and the motor shaft of the motor 11 is used to engage with the knife shaft 31 of the knife assembly 30 to drive the knife assembly 30 to rotate. The knife assembly 30 is detachably installed in the mixing bowl 20.

[0033] Please refer to Figure 2 and Figure 3 , Figure 2 is Figure 1 an exploded view of the knife assembly 30 shown in Figure 3 is Figure 1 a cross-sectional view of the knife assembly 30 shown in

[0034] The knife assembly 30 includes a knife shaft 31 and a knife holder 32 provided with blades. Among them, a connecting head 310 is provided at the top end of the knife shaft 31, and the connecting head 310 is used to engage with the motor shaft. The bottom end of the knife shaft 31 engages with the bowl shaft 21 at the inner bottom of the mixing bowl 20. When the knife assembly 30 is assembled with the bowl shaft 21, the knife shaft 31 and the bowl shaft 21 are coaxial. The "top end" mentioned here is based on the normal working orientation of the knife assembly 30 as the reference orientation. Without special instructions, the orientation terms such as "top surface", "bottom surface", "top end", "bottom end", "bottom", "top", "upper part", "lower part", etc. in the following text all adopt the same reference.

[0035] There is a vertically penetrating receiving cavity 35 inside the tool rest 32, and the tool shaft 31 is axially movable along the tool shaft 31 inside the receiving cavity 35. An elastic member 33 is also provided inside the receiving cavity 35, and the elastic member 33 can be telescopically deformed along the axial direction of the tool shaft 31, so that the tool shaft 31 is a telescopic tool shaft, including two states where the connecting head 310 protrudes from and retracts into the receiving cavity 35. The elastic member 33 can be a compression spring or a compressible elastic colloid, etc. The tool shaft 31 is configured such that when the tool assembly 30 is taken out of the mixing bowl 20, the connecting head 310 can be retracted into the receiving cavity 35 under the action of the elastic member, and when the tool assembly 30 is installed in the mixing bowl 20, the bottom end of the tool shaft 31 is supported by the bowl shaft 21, and the tool rest 32 moves downward under its own gravity to overcome the elastic force of the elastic member 33, so that the connecting head 310 protrudes from the receiving cavity 35. In this way, when the tool assembly 30 is taken out of the mixing bowl 20, or when the tool assembly 30 is not correctly assembled into the mixing bowl, the connecting head 310 is partially or completely retracted into the main sleeve 3210 and cannot be engaged with the motor shaft of the machine head 10, eliminating the safety hazard of the tool assembly 30 rotating and hurting people outside the mixing bowl 20. In addition, when the tool assembly 30 is correctly installed in the mixing bowl 20, the tool rest 32 moves downward by overcoming the elastic force of the elastic member 33 due to its own weight, so that the connecting head 310 can protrude from the receiving cavity 35, ensuring the reliable engagement of the connecting head 310 with the motor shaft.

[0036] In one embodiment, the self-weight of the tool rest 32 is greater than the elastic force of the elastic member 33, which enables the tool assembly 30 to move downward by overcoming the elastic force of the elastic member 33 after being installed in the mixing bowl 20, so that the connecting head 310 protrudes from the receiving cavity 35, ensuring the normal engagement of the connecting head 310 with the motor shaft inside the machine head 10, thereby driving the tool assembly 30 to rotate. In one embodiment, the self-weight of the tool shaft 31 is less than the elastic force of the elastic member 33, which enables the elastic force of the elastic member 33 to retract the tool shaft 31 into the receiving cavity 35. Especially when the tool assembly 30 is inverted, the self-weight of the tool shaft 31 cannot overcome the elastic force of the elastic member 33 to expose the connecting head 310 from the receiving cavity 35, thus ensuring that the connecting head 310 cannot be engaged with the motor shaft and eliminating the safety risk of the tool assembly 30 rotating and hurting people outside the mixing bowl 20.

[0037] In one embodiment, a first step surface 60 is provided on the inner wall of the receiving cavity 35, and a second step surface 311 is provided on the outer surface of the tool shaft 31. The second step surface 311 is located below the first step surface 60, and the elastic member 33 is clamped between the first step surface 60 and the second step surface 311. With such a setting, the elastic member 33 is pre-tightened between the first step surface 60 and the second step surface 311. Without external force, the restoring force of the elastic member 33 can drive the tool shaft 31 to retract into the receiving cavity 35 and remain in the retracted state.

[0038] In one embodiment, the cutter assembly 30 further includes a cutter shaft cover 34 disposed in the accommodation cavity 35. A third step surface 62 is further provided on the inner wall of the accommodation cavity 35. The third step surface 62 is located below the first step surface 60. The second step surface 311 is located between the first step surface 60 and the third step surface 62. A radially protruding annular flange 312 is further provided on the outer surface of the cutter shaft 31. The annular flange 312 is located below the third step surface 62 and above the cutter shaft cover 34. The annular flange 312 abuts against the third step surface 62 when the connecting head 310 extends out of the accommodation cavity 35; the annular flange 312 abuts against the cutter shaft cover 34 when the connecting head 310 retracts into the accommodation cavity 35. The cutter shaft cover 34 provides a limit for the cutter shaft 31 retracted into the accommodation cavity 35 to limit the retracting distance of the cutter shaft 31. The annular flange 312 can achieve the limit in both the extending and retracting directions of the cutter shaft 31, with a simple structure and reliable limit.

[0039] In one embodiment, the cutter shaft cover 34 is provided with an axially penetrating through hole 340. The cutter shaft 31 further includes a bowl shaft abutting section 313 disposed below the annular flange 312. The bowl shaft abutting section 313 is in clearance fit with the through hole 340 and is used to contact the bowl shaft 21 in the mixing bowl 20. The bowl shaft abutting section 313 is arranged as a tapered structure with a gradually decreasing cross-section from top to bottom. With such an arrangement, the machining accuracy of the bowl shaft abutting section 313 can be reduced, and it is easier for the bowl shaft abutting section 313 to retract into the through hole when the cutter shaft 31 retracts.

[0040] In one embodiment, the maximum distance that the connecting head 310 extends out of the accommodation cavity 35 is a, and the maximum distance between the third step surface 62 and the cutter shaft cover 34 is b, where 0 ≤ b - a ≤ 1 mm. This can ensure the normal expansion and contraction of the cutter shaft 31.

[0041] In one embodiment, the tool holder 32 includes a main tool holder 321 and a sub-tool holder 322. The main tool holder 321 includes a main sleeve 3210 sleeved outside the cutter shaft 31 and a main cutting blade 3211 connected to the outside of the main sleeve 3210. Wherein, the accommodation cavity 35 is provided inside the main sleeve 3210, that is, the cutter shaft 31 can move axially along the cutter shaft 31 inside the main sleeve 3210, and the main sleeve 3210 is also in circumferential transmission connection with the cutter shaft 31, so that the main tool holder 321 rotates following the cutter shaft 31. In some embodiments, the main tool holder 321 and the cutter shaft 31 can be detachably connected. Figure 2 and Figure 3In the illustrated embodiment, the main blade 3211 is connected to the lower part of the main sleeve 3210. The main blade 3211 and the main sleeve 3210 can be integrally formed by injection molding, but are not limited thereto. The main blade 3211 may include one or more blades, and the specific number and shape of the blades are not limited.

[0042] The secondary tool rest 322 includes a secondary sleeve 3220 sleeved outside the main sleeve 3210 and a secondary blade 3221 connected to the outside of the secondary sleeve 3220. The secondary sleeve 3220 is sleeved on the main sleeve 3210. The secondary blade 3221 may include one or more blades, and the specific number and shape of the blades are not limited. The secondary sleeve 3220 is in transmission connection with the main sleeve 3210, so that the secondary tool rest 322 rotates following the main tool rest 321.

[0043] In Figure 2 In the illustrated embodiment, the main sleeve 3210 is a stepped sleeve, the cross-sectional area of the bottom is larger, which is set as the large end, and the upper part is set as the small end. The main blade 3211 is connected to the large end at the bottom, and the secondary sleeve 3220 is sleeved on the small end at the upper part. The secondary sleeve 3220 and the secondary blade 3221 can be integrally formed by injection molding, but are not limited thereto.

[0044] The secondary tool rest 322 is detachably connected to the main tool rest 321. The outer surface of the main sleeve 3210 is provided with an anti-disengagement portion 41 protruding radially along the tool axis 31. The anti-disengagement portion 41 is located above the secondary tool rest 322, and the anti-disengagement portion 41 is in limit fit with the secondary tool rest 322 axially along the tool axis 31. The anti-disengagement portion 41 is also used to limit the secondary tool rest 322 from disengaging from the main sleeve 3210, playing a role of axial limit.

[0045] The inner surface of the secondary sleeve 3220 is provided with a groove 50 recessed radially along the tool axis. The groove 50 penetrates through the bottom surface P1 and the top surface P2 of the secondary sleeve 3220 to form a through groove, which is used to cooperate with the anti-disengagement portion 41 when the secondary sleeve 3220 is inserted into the main sleeve 3210. When the secondary sleeve 3220 is installed in place, the anti-disengagement portion 41 is located below the secondary sleeve 3220 and is circumferentially staggered with the groove 50 along the tool axis. That is to say, by providing the groove 50 on the inner surface of the secondary sleeve 3220, interference with the anti-disengagement portion 41 can be avoided when installing the secondary tool rest 322, and axial limit of the secondary tool rest 322 can be achieved by the circumferential stagger between the anti-disengagement portion 41 and the groove, with a simple structure and convenient setting.

[0046] In one embodiment, the outer surface of the main sleeve 3210 is provided with a transmission boss 42 protruding radially along the cutter shaft, and in the axial direction of the cutter shaft 31, the anti-slip portion 41 is closer to the connector 310 than the transmission boss 42. The anti-slip portion 41 and the transmission boss 42 can be arranged opposite to each other on the cutter shaft 31, or can be arranged at a distance staggered along the circumference of the cutter shaft 31. Among them, the groove 50 includes a first groove (close to the top surface P2) and a second groove (close to the bottom surface P1) that are connected, the first groove is located above the second groove, and the size of the second groove along the circumference of the cutter shaft 31 is set to be larger than the size of the first groove 50 along the circumference of the cutter shaft. For example, the secondary sleeve 3220 can be installed from the top of the main sleeve 3210 after the groove 50 is aligned with the anti-slip portion 41, and when the anti-slip portion 41 is completely exposed from the secondary sleeve 3220, the secondary sleeve 3220 is rotated. Since the circumferential size of the second groove is larger, interference with the transmission boss 42 can be avoided when the secondary sleeve 3220 is rotated. When the secondary sleeve 3220 is installed in place, the transmission boss 42 is located in the second groove to be in transmission connection with the secondary sleeve 3220. When the knife assembly 30 is working, the anti-slip portion 41 is used to limit the secondary sleeve 3220 from being separated from the main sleeve 3210, and plays a limiting role. The transmission boss 42 is abutted against the inner wall of the second groove, so that the main sleeve 3210 drives the secondary sleeve 3220 to rotate. The transmission boss 42 has a simple structure and reliable transmission.

[0047] It should be noted that the main sleeve 3210 is movably connected to the knife shaft 31. Figure 2 and Figure 3 In the illustrated embodiment, a non-circular connection hole 61 adapted to the connection head 310 is provided at the top of the main sleeve 3210, and the connection head 310 of the blade shaft 31 is drivingly connected to the main sleeve 3210 at the connection hole 61, so that the blade shaft 31 drives the main sleeve 3210 to rotate. The specific shapes of the connection hole 61 and the connection head 310 are not limited, including but not limited to tooth shapes.

[0048] In one embodiment, the anti-slip portion 41 and the transmission boss 42 can be staggered a certain distance along the circumference of the knife shaft, as long as the first groove of the auxiliary sleeve 3220 close to the top surface P2 is staggered circumferentially with the anti-slip portion 41 when the knife assembly 30 is working, and the transmission boss 42 can be transmission-connected with the auxiliary sleeve 3220 in the second groove on the auxiliary sleeve 3220 close to the bottom surface P1.

[0049] In this embodiment, the anti-slip portion 41 and the transmission boss 42 are arranged opposite to each other on the blade shaft. In this way, the anti-slip portion 41 and the transmission boss 42 are aligned in the axial direction of the main sleeve 3210, and the arrangement positions of the two are more centralized. In addition, the circumferential dimension of the second groove can be prevented from being too large, thereby preventing the strength of the bottom of the main sleeve 3210 from being weakened. Figure 2 and Figure 3In the illustrated embodiment, two anti - detachment portions 41 are provided, and the two anti - detachment portions 41 are arranged at an interval of 180°. Two driving bosses 42 are provided, and the two driving bosses 42 are arranged at an interval of 180°. The anti - detachment portions 41 and the driving bosses 42 are arranged in one - to - one correspondence and are axially aligned.

[0050] Please refer to Figure 3 and Figure 4 , Figure 4 which is the front view of the main tool rest 321.

[0051] In one embodiment, the main sleeve 3210 is arranged as a stepped structure, including a large - end main sleeve 3210a with a larger cross - section at the lower part and a small - end main sleeve 3210b with a smaller cross - section at the upper part. The main blade 3211 is connected to the large - end main sleeve 3210a, the sub - tool rest 322 is connected to the small - end main sleeve 3210b, and the driving boss 42 extends to the stepped surface 3210c where the large - end main sleeve 3210a and the small - end main sleeve 3210b meet. With such a setting, the stepped - structure main sleeve 3210 can also reduce the outer dimension of the sub - sleeve 3220, making the tool rest 32 as a whole more compact. The stepped surface 3210c can also provide support for the sub - tool rest 322 to ensure that the driving boss 42 is located in the second groove 50 above. In Figure 3 In the illustrated embodiment, the outer diameter of the small - end main sleeve 3210b is adapted to the inner diameter of the sub - sleeve 3220.

[0052] In one embodiment, the axial length of the small - end main sleeve 3210b is greater than the axial length of the large - end main sleeve 3210a, and the bottom end of the anti - detachment portion 41 is located at the middle position of the axial direction of the small - end main sleeve 3210b. With such a setting, since the axial length of the large - end main sleeve 3210a is smaller, the main blade 3211 is closer to the bottom of the main sleeve 3210, and this enables the sub - tool rest 322 located below the anti - detachment portion 41 to be closer to the main blade 3211. As a result, the main blade 3211 and the sub - blade 3221 are appropriately set in height in the mixing bowl 20, and both the main blade 3211 and the sub - blade 3221 can stir the food ingredients.

[0053] In Figure 4 the illustrated embodiment, the main sleeve 3210 further includes a hand - holding portion 3210d provided on the small - end main sleeve 3210b. The hand - holding portion 3210d can be set as a convex portion or a concave portion, and the hand - holding portion 3210d facilitates the user to pick up.

[0054] Please refer to Figure 3 , Figure 5 and Figure 6 , Figure 5 which is the sectional view of the main sleeve 3210. Figure 6 which is the front view of the tool shaft 31.

[0055] Inside the main sleeve 3210 is provided with the above-mentioned accommodation cavity 35. The cutter shaft 31 retracts into or extends out of the main sleeve 3210 under the action of the elastic member 33, that is, retracts into or extends out of the accommodation cavity 35. Specifically, the inner wall of the main sleeve 3210 is provided with the above-mentioned first step surface 60, and the outer surface of the cutter shaft 31 is provided with the above-mentioned second step surface 311. The second step surface 311 is located below the first step surface 60. The elastic member 33 can be telescopically deformed along the axial direction of the cutter shaft and is clamped between the first step surface 60 and the second step surface 311.

[0056] The cutter assembly 30 further includes a cutter shaft cover 34. The cutter shaft cover 34 is connected to the inside of the main sleeve 3210 and is located below the second step surface 311 for limiting the axial telescopic distance of the cutter shaft 31. For example, the original length of the elastic member 33 is L. After being clamped between the first step surface 60 and the second step surface 311, the length of the elastic member 33 is L1 (refer to Figure 7 ), L1 < L. The restoring force of the elastic member 33 is greater than the gravity of the cutter shaft 31. With such a setting, during installation, the elastic member 33 is pre-tightened between the first step surface 60 and the second step surface 311. Without external force, the restoring force of the elastic member 33 can drive the cutter shaft 31 to retract into the main sleeve 3210 and remain in the retracted state. At the same time, the cutter shaft cover 34 provides a limit for the cutter shaft 31 retracted into the main sleeve 3210 to limit the retracting distance of the cutter shaft 31. The cutter shaft cover 34 can be detachably connected to the main sleeve 3210.

[0057] Please refer to Figures 5 to 8 , Figure 7 which is a schematic diagram of the connecting head 310 retracting into the main sleeve 3210. Figure 8 which is a schematic diagram of the connecting head 310 extending out of the main sleeve 3210 when the cutter assembly 30 is installed on the mixing bowl 20.

[0058] In one embodiment, as shown in Figure 5 and Figure 7 , the inner wall of the main sleeve 3210 is further provided with the above-mentioned third step surface 62. The third step surface 62 is located below the first step surface 60, and the second step surface 311 is located between the first step surface 60 and the third step surface 62. The outer surface of the cutter shaft 31 is further provided with a radially protruding annular flange 312. The annular flange 312 is located below the second step surface 311 and above the cutter shaft cover 34. The annular flange 312 abuts against the third step surface 62 when the connecting head 310 extends out of the main sleeve 3210, and abuts against the cutter shaft cover 34 when the connecting head 310 retracts into the main sleeve 3210. With such a setting, the cutter shaft 31 can be limited in both directions by the annular flange 312 when the connecting head 310 extends and retracts, that is, the limit of the cutter shaft 31 in two directions is realized, and the structure is simple and the limit is reliable.

[0059] It should be noted that when the external force directly or indirectly acting on the tool shaft 31 is greater than the elastic force of the elastic member 33, the connecting head 310 can extend out of the main sleeve 3210 synchronously, realizing the extension of the tool shaft 31.

[0060] It should be noted that the tool shaft cover 34 can be fixedly connected inside the main sleeve 3210 or axially movably connected inside the main sleeve 3210, and move together with the tool shaft 31 under the support of the bowl shaft 21.

[0061] Please refer to Figure 3 , where the tool shaft cover 34 is fixedly connected inside the main sleeve 3210, the tool shaft cover 34 is provided with an axially through hole 340, and the bowl shaft 21 provides a supporting force for the tool shaft 31 through the through hole 340.

[0062] Figure 3 In [reference], the dimension a is the maximum distance that the connecting head 310 extends out of the main sleeve 3210, and the dimension b is the maximum distance between the third step surface 62 and the tool shaft cover 34. Among them, 0 ≤ b - a ≤ 1 mm. This can ensure the normal telescoping of the tool shaft 31.

[0063] In one embodiment, as shown in Figure 3 and Figure 5 , the tool shaft 31 further includes a bowl shaft abutting section 313 located below the annular flange 312. The bowl shaft abutting section 313 is located at the lowermost end of the tool shaft 31. The bowl shaft abutting section 313 is in clearance fit with the through hole 340 of the tool shaft cover 34 and is used to contact the bowl shaft 21 in the mixing bowl 20. The bowl shaft abutting section 313 is arranged as a tapered structure with a cross-section gradually decreasing from top to bottom. With such a setting, the machining accuracy of the bowl shaft abutting section 313 can be reduced, and it is easier for the bowl shaft abutting section 313 to retract into the through hole 340 when the tool shaft 31 retracts.

[0064] In one embodiment, the through hole 340 is arranged as a tapered hole that gradually contracts from top to bottom. This can also reduce the machining accuracy of the through hole 340. By increasing the opening area at the upper end of the through hole 340, it is further convenient for the tool shaft 31 to retract into the through hole 340.

[0065] As shown in Figure 3 , the minimum inner diameter of the through hole 340 is d, and the outer diameter of the bowl shaft 21 is c. In one embodiment, 0.3 mm ≤ d - c ≤ 0.8 mm. This can ensure that the tool shaft 31 can telescop smoothly, and can also make the connection between the tool shaft cover 34 and the bowl shaft 21 more stable, reducing the play.

[0066] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of protection of the present application.

Claims

1. A knife assembly, characterized in that, Comprising: A cutter shaft (31), at the top of the cutter shaft (31) there is a connector (310) for engaging with the motor shaft inside the machine head (10); A tool holder (32), on which a blade is provided. Inside the tool holder (32) there is a receiving cavity (35) that penetrates vertically. The cutter shaft (31) is movable along the axial direction of the cutter shaft (31) inside the receiving cavity (35). Inside the receiving cavity (35) there is also an elastic member (33), and the elastic member (33) can be elastically deformed in the axial direction of the cutter shaft (31). The cutter shaft (31) is configured such that when the cutter assembly (30) is taken out of the mixing bowl (20), the connector (310) can be retracted into the receiving cavity (35) under the action of the elastic member (33). When the cutter assembly (30) is installed in the mixing bowl (20), the bottom end of the cutter shaft (31) is supported by a bowl shaft (21) at the bottom of the mixing bowl (20), and the tool holder (32) moves downward against the elastic force of the elastic member (33) under its own gravity, so that the connector (310) extends out of the receiving cavity (35).

2. The knife assembly according to claim 1, wherein The self-gravity of the tool holder (32) is greater than the elastic force of the elastic member (33), and / or the self-gravity of the cutter shaft (31) is less than the elastic force of the elastic member (33).

3. The knife assembly according to claim 1, characterized in that, The inner wall of the receiving cavity (35) is provided with a first step surface (60), and the outer surface of the cutter shaft (31) is provided with a second step surface (311). The second step surface (311) is located below the first step surface (60), and the elastic member (33) is clamped between the first step surface (60) and the second step surface (311).

4. The knife assembly according to claim 3, wherein The cutter assembly (30) further includes a cutter shaft cover (34). The cutter shaft cover (34) is arranged inside the receiving cavity (35). The inner wall of the receiving cavity (35) is further provided with a third step surface (62). The third step surface (62) is located below the first step surface (60), and the second step surface (311) is located between the first step surface (60) and the third step surface (62). The outer surface of the cutter shaft (31) is further provided with a radially protruding annular flange (312). The annular flange (312) is located below the third step surface (62) and above the cutter shaft cover (34). The annular flange (312) abuts against the third step surface (62) when the connector (310) extends out of the receiving cavity (35); the annular flange (312) abuts against the cutter shaft cover (34) when the connector (310) retracts into the receiving cavity (35).

5. The knife assembly according to claim 4, wherein, The knife shaft cover (34) is provided with a through hole (340) extending axially therethrough, and the knife shaft (31) further includes a bowl shaft abutment section (313) provided below the annular flange (312), the bowl shaft abutment section (313) being clearance-matched with the through hole (340) for contacting the bowl shaft (21), and the bowl shaft abutment section (313) being configured as a conical structure with a cross section gradually decreasing from top to bottom; and / or, the maximum distance that the connector (310) extends out of the accommodating cavity (35) is a, and the maximum distance between the third step surface (62) and the knife shaft cover (34) is b, wherein 0≤ba≤1mm.

6. The knife assembly according to any one of claims 1 to 5, characterized in that, The tool holder (32) comprises a main tool holder (321) and a secondary tool holder (322), wherein the main tool holder (321) comprises a main sleeve (3210) and a main blade (3211) arranged outside the main sleeve (3210), wherein the main sleeve (3210) is provided with the accommodating cavity (35), wherein the secondary tool holder (322) comprises a secondary sleeve (3220) sleeved outside the main sleeve (3210) and a secondary blade (3221) connected to the outside of the secondary sleeve (3220), wherein the outer surface of the main sleeve (3210) is provided with an anti-slip portion (41) radially protruding along the tool axis (31), wherein the anti-slip portion (41) is located above the secondary tool holder (322), and wherein the anti-slip portion (41) is limitedly matched with the secondary tool holder (322) along the axial direction of the tool axis.

7. The knife assembly according to claim 6, characterized in that, The inner surface of the secondary sleeve (3220) is provided with a groove (50) which is radially recessed along the knife shaft (31). The groove (50) axially penetrates along the knife shaft (31) to the bottom surface and the top surface of the secondary sleeve (3220) and is used to cooperate with the anti-slip portion (41) when the secondary sleeve (3220) is installed into the main sleeve (3210). When the secondary sleeve (3220) is installed in place, the anti-slip portion (41) is located above the secondary sleeve (3220) and is staggered with the groove (50) along the circumference of the knife shaft (31).

8. The knife assembly according to claim 7, characterized in that, The outer surface of the main sleeve (3210) is also provided with a transmission boss (42) radially protruding along the knife shaft (31); along the axial direction of the knife shaft (31), the anti-slip portion (41) is closer to the connecting head (310) than the transmission boss (42); the groove (50) includes a first groove and a second groove which are connected; the first groove is located above the second groove; the size of the second groove along the circumference of the knife shaft (31) is larger than the size of the first groove along the circumference of the knife shaft (31); when the auxiliary sleeve (3220) is installed in place, the transmission boss (42) is located in the second groove to be transmission-connected to the auxiliary sleeve (3220).

9. The knife assembly according to claim 8, characterized in that, The main sleeve (3210) is arranged in a stepped structure, including a large end of the main sleeve (3210a) located at the lower part and a small end of the main sleeve (3210b) located at the upper part. The main blade (3211) is connected to the large end of the main sleeve (3210a), the auxiliary tool rest (322) is connected to the small end of the main sleeve (3210b), and the transmission boss (42) extends to the stepped surface (3210c) where the large end of the main sleeve (3210a) and the small end of the main sleeve (3210b) are joined.

10. A cooking machine, characterized in that, Comprising: A machine head (10), including a motor (11); A mixing bowl (20), located below the machine head (10), and a bowl shaft (21) is provided at the bottom of the mixing bowl (20); The tool assembly (30) according to any one of claims 1 to 9, when the tool assembly (30) is in a state of being taken out of the mixing bowl (20), the connecting head retracts into the accommodating cavity (35); when the tool assembly (30) is installed in the mixing bowl (20), the connecting head (310) of the tool assembly (30) extends out of the accommodating cavity (35) and engages with the motor shaft of the motor (11), and the bowl shaft (21) abuts against the lower end of the tool shaft (31).

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