A juicer

Abstract

The application discloses a juicer and belongs to the field of food processing equipment, which comprises a main body and a juicing assembly, a driving shaft is arranged in the main body, the juicing assembly comprises a squeezing cylinder and a squeezing screw rod, the squeezing screw rod comprises a connecting end and a feeding end, the connecting end is detachably connected with the driving shaft, the connecting end is provided with a shaft hole for being plugged with the driving shaft, an axial limiting structure is arranged between the shaft hole and the driving shaft, the axial limiting structure comprises a limiting groove and a limiting block, the limiting groove is intersected with the axial direction of the driving shaft at a certain angle, one of the shaft hole and the driving shaft is provided with the limiting groove, and the other is provided with the limiting block, in a normal working rotating state of the squeezing screw rod, the limiting block is axially locked in the limiting groove by the circumferential rotation of the driving shaft or the squeezing screw rod, and in a non-working state of the squeezing screw rod, the limiting block can be separated from the limiting groove. The application has the advantages that the axial limiting structure of the squeezing screw rod is optimized, and the juicer is more helpful for the squeezing of large-size food.

Description

TECHNICAL FIELD

[0001] The present application relates to a juicer, belonging to the field of food processing equipment. BACKGROUND

[0002] With the progress of science and technology and the improvement of living standards, juicers are becoming more and more popular. The main structure of a juicer includes a main body and a juicing assembly connected to the main body. The juicing assembly usually includes an extrusion screw and an extrusion cylinder. The principle is to rotate the extrusion screw in the extrusion cylinder, so that the food to be extruded is extruded between the extrusion screw and the extrusion cylinder to extract the liquid.

[0003] In the current mainstream juicer products, the extrusion screw is detachably connected to the base, so that it can be easily cleaned. However, in actual work, the extrusion screw will be subjected to a reaction force from the food when extruding the food, and will have a tendency to move upward in the vertical direction. Therefore, the current mainstream juicer products all have a limiting structure designed for the extrusion screw to limit its upward movement.

[0004] The current mainstream juicer products limit the screw mainly at the top center position of the extrusion screw, such as the screw structure disclosed in patents CN113243744B, CN111246780B and CN111345707A. A center protrusion is usually provided at the center top of the screw to cooperate with the upper feed housing for limiting. In addition, some juicer products use a large flat surface to press the extrusion screw to limit its movement. This requires a corresponding flat surface to be provided on the extrusion screw.

[0005] The main disadvantage of the above screw limiting structure is that if the limiting is at the top of the extrusion screw, it will occupy too much space at the top of the extrusion screw. Since the top of the extrusion screw is usually the main inlet for food, setting a limiting structure at the top of the extrusion screw will sacrifice part of the space of the discharge channel, resulting in that many large-sized foods cannot be well extruded and brought in. If the extrusion screw is pressed by a large flat surface, it will generate a relatively large resistance, and the juicer product usually needs to consume more power to overcome the frictional resistance. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a juicer that optimizes the axial limiting structure of the extrusion screw and is more conducive to the extrusion of large-sized food.

[0007] To solve the above technical problems, the present application adopts the following technical solutions:

[0008] A juicer comprises a main body and a juicing assembly, the main body is internally provided with a driving shaft, the juicing assembly comprises a squeezing cylinder and a squeezing screw, the squeezing screw comprises a connecting end and a feeding end, the connecting end is detachably connected with the driving shaft, the feeding end faces a feeding direction of food, the connecting end is provided with a shaft hole for plugging with the driving shaft, an axial limiting structure is arranged between the shaft hole and the driving shaft, the axial limiting structure comprises a limiting groove and a limiting block, the limiting groove intersects with an axial direction of the driving shaft at a certain angle, one of the shaft hole and the driving shaft is provided with the limiting groove, and the other is provided with the limiting block, in a normal working rotating state of the squeezing screw, the limiting block is axially locked in the limiting groove by circumferential rotation of the driving shaft or the squeezing screw, and in a non-working state of the squeezing screw, the limiting block can be separated from the limiting groove.

[0009] The beneficial effects of the present application are as follows:

[0010] Firstly, in the present application, the axial limiting of the squeezing screw is optimized from external positioning to internal positioning, and the axial limiting is performed from the inside of the squeezing screw, so that the space of the central position of the top of the screw can be reserved, and this part of the reserved space can be used for other purposes, such as being used as a space for expanding the discharge, because the food enters the top of the squeezing screw from the upper feeding shell, reserving the space of the central position of the top of the squeezing screw can help the food to enter the spiral discharging channel of the squeezing screw better, so that the squeezing of food with larger size can be realized, and under the premise of ensuring the limiting, the food can enter the spiral discharging channel between the squeezing screw and the squeezing cylinder better.

[0011] Secondly, as described above, since the limiting of the squeezing screw is optimized to the inside, the freedom of modification of the external structure of the squeezing screw is greater, and the limiting structure does not need to be arranged on the top, which is more conducive to the design and update of the squeezing screw by designers, and also liberates the design constraint of the feeding shell, and the feeding shell does not necessarily need to be designed with a limiting structure matched with the squeezing screw, and the freedom of design is greater for both the squeezing screw and the feeding shell, which is helpful for the upgrading of the juicer product.

[0012] In addition, compared with other large-plane pressing limiting methods, the limiting in the present application is arranged between the driving shaft and the shaft hole, the force receiving area of this position is small, and the generated plane frictional resistance is not large, so compared with the large-plane pressing limiting method, this limiting method does not need a juicer product with a large power to overcome the frictional resistance.

[0013] Finally, in the present application, the locking mode of the limiting block and the limiting slot can be locked by the circumferential rotation of the driving shaft or the extrusion screw, and when the driving shaft or the extrusion screw stops rotating, the locking mode can be released, so that natural locking is achieved in the working state, and convenient unlocking is achieved in the non-working state, which is very natural and convenient.

[0014] As a preferred, the normal working rotation direction of the extrusion screw is the first direction, and in the non-working state, the extrusion screw reversely rotates towards the first direction to drive the limiting block to be separated from the limiting slot.

[0015] As a preferred, one of the shaft hole and the driving shaft further comprises an insertion slot, the insertion slot and the limiting slot are in communication with each other, and when the extrusion screw is inserted with the driving shaft, the limiting block first passes through the insertion slot and then enters the limiting slot.

[0016] As a preferred, the insertion slot is parallel to the axial direction of the driving shaft, the limiting slot is perpendicular to the axial direction of the driving shaft, and a circumferential limiting piece is arranged between the shaft hole and the driving shaft, and when the extrusion screw normally rotates in the circumferential direction, the limiting block moves transversely into the limiting slot and is limited to continue transversely moving by the circumferential limiting piece.

[0017] As a preferred, the limiting slot is located on the driving shaft, and the limiting block is located on the inner wall of the shaft hole, the driving shaft comprises a shaft body and at least one radially outward convex axial rib on the outer wall of the shaft body, the limiting slot is arranged on the axial rib, and the insertion slot is formed between the axial rib and the outer wall of the shaft body.

[0018] As a preferred, the axial rib is provided with at least two, and the limiting block is also provided with at least two.

[0019] As a preferred, a limiting rib is arranged on the inner wall of the shaft hole, the limiting rib forms the circumferential limiting piece, and when the limiting block enters the limiting slot, the limiting rib and the rib are in contact in the circumferential direction.

[0020] As a preferred, the limiting slot is located on the inner wall of the shaft hole, and the limiting block is located on the driving shaft, an L-shaped slot is arranged on the inner wall of the shaft hole, the L-shaped slot comprises a first slot extending in the axial direction and a second slot extending in the transverse direction, the first slot is the insertion slot, and the second slot is the limiting slot, the limiting block is inserted from the first slot, and when the extrusion screw rotates relative to the driving shaft, the limiting block moves transversely into the second slot.

[0021] As a preferred, the limiting slot is a spiral strip-shaped slot arranged on the inner wall of the shaft hole, a spiral rib corresponding to the spiral strip-shaped slot is arranged on the outer wall of the driving shaft, when the shaft hole is inserted with the driving shaft, the spiral rib is rotated and inserted into the spiral strip-shaped slot, and when the spiral rib is rotated and inserted, the rotation direction of the extrusion screw is opposite to the normal working rotation direction.

[0022] As preferred, the outer wall of the driving shaft is provided with radially movable balls, the inner wall of the shaft hole is provided with an annular groove, the annular groove constitutes the limiting groove, and the balls are moved radially outward into the annular groove under the centrifugal force when the driving shaft rotates circumferentially.

[0023] As preferred, the connecting end of the extrusion screw is provided with a metal sleeve, and the shaft hole is located on the metal sleeve.

[0024] As preferred, the extrusion screw comprises an extrusion part and a discharging part above the extrusion part, the extrusion part comprises a rotary main body and at least one grinding strip on the outer side of the rotary main body, the discharging part is formed by a main helical sheet extending helically upward, the top center of the discharging part is a smooth surface, the top surface of the main helical sheet forms a guide surface, and the guide surface guides the material to be processed to the extrusion part.

[0025] As preferred, the feeding shell comprises a discharging channel extending downward, the extrusion screw comprises a rotary central axis, the rotary central axis is coaxial with the driving shaft, and the rotary central axis extends upward through the entire discharging channel.

[0026] As preferred, the feeding shell is a cylindrical body, the discharging channel extends linearly in the vertical direction, the feeding shell comprises an upper barrel opening and a lower barrel opening, the lower barrel opening is connected with the juicing assembly, and the ratio of the horizontal projection area of the upper barrel opening to the horizontal projection area of the extrusion screw is C, and the C satisfies 0.7≤C≤2.

[0027] The features and advantages of the present application will be disclosed in detail in the following specific embodiments and drawings.

DRAWINGS

[0028] The present application will be further described below in combination with the drawings.

[0029] Figure 1 It is a whole schematic view of the embodiment one of the present application;

[0030] Figure 2 It is an explosion schematic view of the embodiment one of the present application;

[0031] Figure 3 It is an exploded schematic view of the driving shaft and the extrusion screw in the embodiment one of the present application;

[0032] Figure 4 It is a structural schematic view of the sleeve in the embodiment one of the present application;

[0033] Figure 5 It is a cooperation schematic view of the driving shaft and the sleeve in the embodiment one of the present application;

[0034] Figure 6 It is a structural schematic view of the extrusion screw in the embodiment one of the present application;

[0035] Figure 7 Figure 2 is an exploded view of the drive shaft and the shaft sleeve in the second embodiment of the present application;

[0036] Figure 8 Figure 3 is an exploded view of the drive shaft and the shaft sleeve in the third embodiment of the present application;

[0037] Figure 9 Figure 4 is a structural view of the shaft sleeve in the third embodiment of the present application;

[0038] Figure 10 Figure 5 is a sectional view of the drive shaft and the shaft sleeve in the fourth embodiment of the present application;

[0039] Figure 11 Figure 6 is a structural view of the fifth embodiment of the present application;

[0040] Figure 12 Figure 7 is a sectional view of the feeding shell and the juicing assembly in the fifth embodiment of the present application.

DETAILED DESCRIPTION

[0041] The technical solutions of the embodiments of the present application will be explained and described below in combination with the drawings of the embodiments of the present application. However, the following embodiments are only preferred embodiments of the present application, and not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without making creative efforts are within the protection scope of the present application.

[0042] In the following description, the terms such as "inner", "outer", "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0043] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. However, it is noted that direct connection means that the connection between the two main bodies does not form a connection relationship through an excessive structure, but is connected only through the connection structure to form a whole. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0045] Embodiment I:

[0046] As shown in Figures 1 to 6 , the present embodiment shows a juicer, specifically a vertical juicer, which mainly comprises a main body 10, a juicing assembly 20 and a feeding shell 30. The main body 10 is provided with a driving motor and a driving shaft 11. The juicing assembly 20 comprises a squeezing cylinder 21 and a squeezing screw 22. In the working state, the squeezing screw 22 is located in the squeezing cylinder 21, and the top of the driving shaft 11 is connected with the squeezing screw 22. The driving motor drives the driving shaft 11 to rotate, and the driving shaft 11 drives the squeezing screw 22 to rotate when rotating. The feeding shell 30 is located above the juicing assembly 20. The feeding shell 30 has a through feeding channel from top to bottom, which is communicated with the squeezing cylinder 21. Food is put into the feeding shell 30 from the top and enters the squeezing cylinder 21 along the feeding channel. The residue and liquid are separated under the rotation of the squeezing screw 22, so as to realize juicing. In order to facilitate the cleaning of the juicing assembly 20, the squeezing screw 22 and the driving shaft 11 are usually detachably connected. Thus, the juicing assembly 20 can be separately taken down for cleaning. As shown in Figure 1 and Figure 2 , the feeding shell 30, the juicing assembly 20 and the main body 10 are all detachably connected.

[0047] For the squeezing screw 22, in the squeezing process, it will be subjected to the reaction force from the food, thus tending to move upward or shift. Therefore, it is necessary to vertically limit the squeezing screw 22. The existing limiting structure is usually arranged at the top of the squeezing screw, for example, a limiting hole is arranged on the feeding shell, and a limiting protrusion is arranged at the top of the squeezing screw, which is inserted into the limiting hole; or a limiting flat surface is arranged on the periphery of the squeezing screw, and a corresponding flat surface is arranged on the feeding shell to press tightly, so as to realize limiting.

[0048] The original position of the limiting structure is changed in the embodiment, and the limiting structure is arranged between the extrusion screw 22 and the driving shaft 11. Specifically, the extrusion screw 22 includes a connecting end and a feeding end. In the embodiment, the connecting end is the bottom of the extrusion screw 22, and the feeding end is the top of the extrusion screw 22. The connecting end is detachably connected with the driving shaft 11. The feeding end faces the feeding direction of the food. The feeding end is arranged as a guide surface. The food is gradually extruded and discharged from the guide surface. The connecting end is provided with a shaft hole 220 for inserting the driving shaft 11. An axial limiting structure is arranged between the shaft hole 220 and the driving shaft 11. The axial limiting structure includes a limiting groove 41 and a limiting block 42. One of the shaft hole 220 and the driving shaft 11 is provided with the limiting groove 41, and the other is provided with the limiting block 42. In the normal working rotating state of the extrusion screw 22, the limiting block 42 is axially locked in the limiting groove 41 by the circumferential rotation of the driving shaft 11 or the extrusion screw 22. In the non-working state of the extrusion screw 22, the limiting block 42 can be separated from the limiting groove 41. The positions of the limiting groove 41 and the limiting block 42 can be interchanged. In the embodiment, the limiting block 42 is arranged on the shaft hole 220, and the limiting groove 41 is arranged on the driving shaft 11. In other embodiments, the limiting block 42 can be arranged on the driving shaft 11, and the limiting groove 41 can be arranged on the shaft hole 220.

[0049] In the embodiment, the limiting of the extrusion screw 22 is optimized from external positioning to internal positioning. The limiting is performed inside the extrusion screw 22. Thus, the space of the central position of the top of the extrusion screw 22 can be reserved. The reserved space can be used for other purposes, such as expanding the discharging space. Because the food enters the extrusion screw 22 from the upper feeding shell 30, reserving the space of the central position of the top of the extrusion screw 22 can help the food enter the spiral discharging channel of the extrusion screw 22 better. Thus, the extrusion screw 22 can be used for extruding larger food. Therefore, under the premise of ensuring the limiting, the food can enter the spiral discharging channel between the extrusion screw 22 and the extrusion cylinder 21 better. In addition, as described above, because the limiting of the extrusion screw 22 is optimized to the inside, the freedom of modification of the external structure of the extrusion screw 22 is greater. The extrusion screw 22 is no longer constrained by the need to arrange the limiting structure on the top. This is more conducive to the designers to design and update the extrusion screw 22. Meanwhile, the design constraint of the feeding shell 30 is also eliminated. There is no need to design the limiting structure matched with the needle and the top of the extrusion screw. Therefore, the overall update of the juicer product is facilitated.

[0050] In addition, compared with other large flat pressing limiting modes, the limiting in the embodiment is arranged between the driving shaft 11 and the shaft hole 220. Since the driving shaft 11 itself is small in size, the limiting force area is small, and the generated flat frictional resistance is not large, so compared with the large flat pressing limiting mode, the limiting mode does not require large power of the juicer product to overcome the frictional resistance.

[0051] Finally, the locking mode of the limiting block 42 and the limiting groove 41 in the embodiment can rely on the circumferential rotation of the driving shaft 11 or the extrusion screw 22 to realize locking, and when the driving shaft 11 or the extrusion screw 22 stops rotating, the locking mode can be released, so that natural locking is realized in the working state, and natural and convenient unlocking is realized in the non-working state, which is relatively ingenious in structural design.

[0052] For the unlocking mode, it is preferred to realize unlocking through the reverse rotation mode, that is, if the normal working rotation direction of the extrusion screw 22 is the first direction, in the non-working state, the extrusion screw 22 is reversely rotated towards the first direction to drive the limiting block 42 to be separated from the limiting groove 41. This unlocking mode does not need to separately set an unlocking structure, and only needs to reverse on the basis of the original structure to realize unlocking, which is very convenient. In addition, this design also has an advantage that when the extrusion screw 22 stops rotating last time, the limiting block 42 is still located in the limiting groove 41, that is, the limiting block 42 does not need to be aligned when it enters the limiting groove 41 next time, that is, as long as it is not artificially intentionally unlocked, the extrusion screw 22 and the driving shaft 11 are basically in a long-term locking state.

[0053] In order to facilitate the insertion between the extrusion screw 22 and the driving shaft 11 after the juicing assembly 20 is cleaned, one of the shaft hole 220 and the driving shaft 11 further comprises an insertion slot 43, the insertion slot 43 and the limiting groove 41 are in communication with each other, and when the extrusion screw 22 and the driving shaft 11 are inserted, the limiting block 42 first passes through the insertion slot 43 and then enters the limiting groove 41. The insertion slot 43 and the limiting groove 41 are relatively independent in function, and the insertion is mainly realized through the cooperation of the limiting block 42 and the insertion slot 43, and the limiting is mainly realized through the cooperation of the limiting block 42 and the limiting groove 41.

[0054] Of course, it needs to be explained that the insertion slot 43 and the limiting groove 41 are relatively independent in the embodiment, and in other embodiments, they can be common, which can be referred to the embodiment mode in embodiment 3 below.

[0055] In order to prevent the limiting block 42 from easily switching between the limiting groove 41 and the insertion slot 43, the insertion slot 43 and the limiting groove 41 are switched at a 90-degree angle in the embodiment, like Figures 3 to 5As shown, the insertion slot 43 is parallel to the axial direction of the drive shaft 11, and the limiting slot 41 is perpendicular to the axial direction of the drive shaft 11, so when the extrusion screw 22 rotates normally in the circumferential direction, i.e. in the clockwise direction as indicated by the arrow, the limiting slot 41 on the drive shaft 11 moves towards the limiting block 42 on the inner wall of the shaft hole 220, so that the limiting block 42 is clamped into the limiting slot 41, completing the axial limiting. Figure 5 As shown, the insertion slot 43 is parallel to the axial direction of the drive shaft 11, and the limiting slot 41 is perpendicular to the axial direction of the drive shaft 11, so when the extrusion screw 22 rotates normally in the circumferential direction, i.e. in the clockwise direction as indicated by the arrow, the limiting slot 41 on the drive shaft 11 moves towards the limiting block 42 on the inner wall of the shaft hole 220, so that the limiting block 42 is clamped into the limiting slot 41, completing the axial limiting.

[0056] In addition, in order to avoid the drive shaft 11 continuing to rotate in the circumferential direction relative to the shaft hole 220 to cause the limiting block 42 to disengage from the limiting slot 41, a circumferential limiting member 44 is arranged between the shaft hole 220 and the drive shaft 11 in this embodiment, which is a limiting protruding rib on the inner wall of the shaft hole 220 protruding towards the center, and the drive shaft 11 includes a shaft body 111 and at least one radially outwardly protruding axial protruding rib 45 on the outer wall of the shaft body 111, and the limiting slot 41 is arranged on the axial protruding rib 45, which can be seen from Figure 5 As shown, the limiting slot 41 divides the axial protruding rib 45 into an upper protruding rib 451 and a lower protruding rib 452. Figure 5 As shown, the limiting slot 41 divides the axial protruding rib 45 into an upper protruding rib 451 and a lower protruding rib 452.

[0057] In order to increase the limiting stability, the axial protruding rib 45 on the drive shaft 11 is preferably provided with at least two, and in this embodiment, three are preferably provided, and the limiting block 42 is also correspondingly provided with three, and the limiting protruding rib on the inner wall of the shaft hole 220 is also provided with three, and the provision of multiple limiting protruding ribs not only increases the limiting stability, but also reduces the circumferential rotation space of the drive shaft 11 in the shaft hole 220, so that when the plug-in alignment is performed, the limiting slot 41 does not need to be moved to the limiting slot 41 by a large angle.

[0058] Furthermore, to make the axial clearance between the drive shaft 11 and the shaft hole 220 more controllable, the connecting end of the extrusion screw 22 in this embodiment is provided with a metal bushing 221. Specifically, the bottom center of the extrusion screw 22 is provided with a shaft 222, and the metal bushing 221 is built into the bottom of the shaft 222, while the shaft hole 220 is located on the metal bushing 221. The drive shaft 11 is usually a metal shaft, while the extrusion screw 22 is usually made of plastic. If the shaft hole 220 is also a plastic inner hole, the limit block 42 is prone to wear after the drive shaft 11 drives the extrusion screw 22 for a long time, thereby increasing the axial clearance between the limit block 42 and the limit groove 41. By setting the metal bushing 221, the shaft hole 220 also becomes a metal inner hole. When used in conjunction with the metal drive shaft 11, the wear is relatively small, and the axial clearance is more stable.

[0059] Regarding the extrusion screw 22, since the axial limiting device is located inside the extrusion screw 22 in this embodiment, the design freedom of the extrusion thread shape is greater, such as... Figure 6 As shown, in this embodiment, since a limiting structure is not required at the center of the top of the extrusion screw 22, the space at the center of the top can be reserved, and this reserved space can be used for other purposes. Figure 6 For example, the top of the extrusion screw 22 is completely hollowed out at its rotation axis X, which can be used to expand the feeding space. Since the food enters the top of the extrusion screw 22 from the upper feed housing 30, leaving space in the center of the top of the extrusion screw 22 can help the food enter the spiral feeding channel of the extrusion screw 22 better. This can be used to extrude larger sized foods. Therefore, while ensuring that the food can be limited, it can also make it more convenient for the food to enter the spiral feeding channel between the extrusion screw 22 and the extrusion cylinder 21.

[0060] Specifically, in this embodiment, the extrusion screw 22 includes an extrusion section 223 and a feeding section 224 located above the extrusion section 223. The feeding section 224 mainly guides the food at the top of the extrusion screw 22 into the extrusion section 223, and also undertakes a certain extrusion action. The extrusion section 223 is the area that mainly extrudes and grinds the food, and also has a certain feeding action. The extrusion section 223 includes a rotating body and at least one grinding strip 2231 disposed on the outer surface of the rotating body. The grinding strip 2231 is also spiral. The feeding section 224 is formed by a main spiral blade 2241 extending spirally upward. The feeding section 224 referred to herein as being formed by the main spiral blade 2241 extending spirally upward means that the feeding section 224 is basically hollow at the center of the extrusion screw and has no limiting structure. That is, the curvature of the top center of the extrusion screw 22 is basically consistent with the curvature of the surrounding surface, forming a smooth transition. When the food is fed vertically, it can directly contact the top surface of the main spiral blade 2241. The top surface of the main spiral blade 2241 forms a guide surface 2242, which guides the food to be processed to the extrusion section 223.

[0061] Example 2

[0062] like Figure 7 As shown, the difference between this embodiment and embodiment one is that the structures of the limiting block 42 and the limiting groove 41 are different. In this embodiment, the limiting groove 41 is located on the inner wall of the shaft hole 220, and the limiting block 42 is located on the drive shaft 11.

[0063] Specifically, in this embodiment, the inner wall of the shaft hole 220 is provided with an L-shaped groove. The L-shaped groove includes an axially extending first groove 413 and a laterally extending second groove 414. The first groove 413 is an insertion groove 43, and the second groove 414 is a limiting groove 41. The limiting block 42 is inserted from the first groove 413. When the extrusion screw 22 rotates relative to the drive shaft 11, the limiting block 42 enters the second groove 414 laterally. The top of the second groove 414 has a limiting sealing plate 415. When the limiting block 42 enters the second groove 414, its axial position is restricted by the limiting sealing plate 415.

[0064] When the drive shaft 11 rotates normally, the limiting block 42 abuts against the inner wall of the second groove 414, so that the drive shaft 11 and the metal bushing 221 rotate together. When unlocking is required, the squeezing screw 22 is rotated in the opposite direction, so that the limiting block 42 slides from the second groove 414 to the top of the first groove 413, and can then be moved axially out of the first groove 413.

[0065] Example 3

[0066] like Figures 8 to 9As shown, the difference between this embodiment and Embodiment 1 is that the limiting groove 41 is a spiral strip groove provided on the inner wall of the shaft hole 220. Preferably, there are four spiral strip grooves. The outer wall of the drive shaft 11 is provided with spiral ribs corresponding to the spiral strip grooves. The spiral ribs constitute the limiting block 42, and there are also four spiral ribs.

[0067] by Figure 8 For example, the clockwise arrow on the extrusion screw 22 indicates its normal rotation direction. When the shaft hole 220 is inserted into the drive shaft 11, the helical rib rotates and inserts into the helical groove. During insertion, the rotation direction of the extrusion screw 22 is opposite to its normal rotation direction; that is, when the drive shaft 11 or the extrusion screw 22 rotates counterclockwise, the helical rib can rotate and insert simultaneously to complete the insertion. After insertion, when the extrusion screw 22 rotates under normal operating conditions, the extrusion screw 22 and the drive shaft 11 become increasingly tighter with each rotation, forming an axial limit between them.

[0068] Example 4

[0069] like Figure 10 As shown, the difference from Embodiment 1 lies in the structure of the limiting block 42 and the limiting groove 41 in this embodiment. In this embodiment, the outer wall of the drive shaft 11 is provided with radially movable balls, which constitute the limiting block 42. The balls have their own centripetal restoring force, which can be achieved by using the tension of a small tension spring, or by setting an inclined slide groove 113 inside the drive shaft 11, allowing the balls to slide naturally to the center by their own weight. In this embodiment, an inclined slide groove is set inside the drive shaft 11, and the balls are freely disposed within the inclined slide groove 113.

[0070] Meanwhile, an annular groove is provided on the inner wall of the shaft hole 220 of the metal bushing 221. This annular groove constitutes the limiting groove 41. When the extrusion screw 22 is not rotating, the balls are subjected to a centripetal restoring force, which is concentrated at the center of the drive shaft 11. When the extrusion screw 22 rotates, the balls are subjected to a centrifugal force. This centrifugal force overcomes the restoring force, causing the balls to move radially outward. When the balls reach the outermost end, part of them extend out of the outer wall of the drive shaft 11 and enter the annular groove of the shaft hole 220, thereby achieving axial limiting. When the extrusion screw 22 is not rotating, the balls, under the action of the centripetal restoring force, disengage from the annular groove and return to the center of the drive shaft 11, completing natural unlocking.

[0071] Example 5

[0072] like Figure 11 and Figure 12As shown, the difference between the embodiment and embodiment one is that the feeding shell structure in the embodiment is changed, and since the feeding shell in the application does not need to be axially limited to the top of the extrusion screw, the structural design freedom of the feeding shell is higher, which means that a feeding shell that is more convenient for discharging can be designed, and the embodiment is an optimized design of the feeding shell.

[0073] In general, the feeding shell includes a discharging channel 301 from top to bottom, the extrusion screw includes a rotary central axis X, the rotary central axis X is coaxial with the driving shaft, and the rotary central axis X extends upward through the entire discharging channel 301. In this context, the upward extension through the entire discharging channel 301 means that the rotary central axis X extends upward to the upper end of the feeding port without any obstacles, and food can directly fall from the upper end of the feeding port to the top center of the extrusion screw 22, and the feeding of food becomes simpler and more direct, which can be seen in Figure 12 However, the traditional feeding shell such as in embodiment one is not a through-type discharging in the strict sense.

[0074] Under this concept, the feeding shell is preferably a cylindrical body, and of course the specific shape of the cylindrical body can be varied, which can be a square cylindrical body, an oval cylindrical body, a straight cylindrical body, a conical cylindrical body, etc. The conical cylindrical body is specifically shown in the embodiment, which includes an upper cylinder port and a lower cylinder port, the lower cylinder port is slightly larger than the upper cylinder port, the lower cylinder port is connected with the juicing assembly, and the upper cylinder port forms a feeding port. The ratio of the horizontal projection area of the upper cylinder port to the horizontal projection area of the extrusion screw is C. Since the cylindrical body in the embodiment is conical, the ratio C can be understood as the ratio of the diameter R1 of the upper cylinder port to the maximum diameter R2 of the extrusion screw. The ratio preferably satisfies: 0.7≤C≤2. If the value of C is too small, it is not suitable for the placement of large-diameter food, and if the ratio is too large, it can lead to the fact that food can be placed but cannot be normally extruded into the extrusion screw. The parameters between 0.7 and 2 are more appropriate.

[0075] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto. Those skilled in the art should understand that the application includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the application will be included in the scope of the claims.

Claims

1. A juicer comprising a main body and a juicing assembly, the main body having a drive shaft disposed therein, the juicing assembly comprising a pressing cylinder and a pressing screw, the pressing screw comprising a connecting end and a feeding end, the connecting end being detachably connected with the drive shaft, the feeding end facing a feeding direction of food, characterized in that, The connecting end is provided with a shaft hole for inserting the driving shaft, and an axial limiting structure is arranged between the shaft hole and the driving shaft, the axial limiting structure comprises a limiting groove and a limiting block, the limiting groove intersects with the axial direction of the driving shaft at a certain angle, one of the shaft hole and the driving shaft is provided with the limiting groove, and the other is provided with the limiting block, the limiting block is axially locked in the limiting groove by the circumferential rotation of the driving shaft or the extruding screw in the normal working rotation state, the limiting block can be separated from the limiting groove in the non-working state of the extruding screw, the normal working rotation direction of the extruding screw is the first direction, the extruding screw reversely rotates towards the first direction in the non-working state, drives the limiting block to separate from the limiting groove, one of the shaft hole and the driving shaft further comprises an insertion groove, the insertion groove and the limiting groove are in communication with each other, the limiting block enters the limiting groove through the insertion groove first and then enters the limiting groove when the extruding screw is inserted with the driving shaft, the insertion groove is parallel to the axial direction of the driving shaft, and the limiting groove is perpendicular to the axial direction of the driving shaft.

2. A juicer as claimed in claim 1, characterised in that: A circumferential limiting piece is arranged between the shaft hole and the driving shaft, and the limiting block moves transversely into the limiting groove and is limited to continue transversely moving by the circumferential limiting piece when the extruding screw normally rotates circumferentially.

3. A juicer as claimed in claim 2, wherein: The limiting groove is located on the driving shaft, and the limiting block is located on the inner wall of the shaft hole, the driving shaft comprises a shaft body and at least one radially outward convex axial rib on the outer wall of the shaft body, the limiting groove is arranged on the axial rib, and the insertion groove is formed between the axial rib and the outer wall of the shaft body.

4. A juicer as claimed in claim 3 wherein: The axial rib is provided with at least two axial ribs, and the limiting block is also provided with at least two limiting blocks.

5. A juicer as claimed in claim 3, wherein: A limiting convex rib is arranged on the inner wall of the shaft hole, the limiting convex rib forms the circumferential limiting piece, and the limiting convex rib and the convex rib are in contact in the circumferential direction after the limiting block enters the limiting groove.

6. A juicer as claimed in claim 2, wherein: The limiting groove is located on the inner wall of the shaft hole, and the limiting block is located on the driving shaft, an L-shaped groove is arranged on the inner wall of the shaft hole, the L-shaped groove comprises a first groove extending in the axial direction and a second groove extending in the transverse direction, the first groove is the insertion groove, and the second groove is the limiting groove, the limiting block is inserted from the first groove, and the limiting block moves transversely into the second groove when the extruding screw rotates relative to the driving shaft.

7. A juicer as claimed in claim 1, characterized in that: The limiting groove is a spiral strip groove arranged on the inner wall of the shaft hole, a spiral convex rib corresponding to the spiral strip groove is arranged on the outer wall of the driving shaft, the spiral convex rib is rotated and inserted into the spiral strip groove when the shaft hole is inserted with the driving shaft, and the rotating direction of the extruding screw is opposite to the rotating direction in the normal working state when the spiral convex rib is rotated and inserted.

8. A juicer as claimed in any one of claims 1 to 7 wherein: The connecting end of the extruding screw is provided with a metal shaft sleeve, and the shaft hole is arranged on the metal shaft sleeve.

9. A juicer as claimed in any one of claims 1 to 7 wherein: The extruding screw comprises an extruding part and a discharging part located above the extruding part, the extruding part comprises a rotary main body and at least one grinding strip arranged on the outer side surface of the rotary main body, the discharging part is formed by a main spiral piece extending upward in a spiral manner, the top center of the discharging part is a smooth surface, the top surface of the main spiral piece forms a guide surface, and the guide surface guides the to-be-processed object to the extruding part.

10. A juicer as claimed in any one of claims 1 to 7 wherein: The feeding shell comprises a downward feeding channel, the extrusion screw comprises a rotation central axis coaxial with the driving shaft, and the rotation central axis extends upward through the whole feeding channel.

11. A juicer as claimed in claim 10, wherein: The feeding shell is a cylindrical body, the feeding channel extends linearly in the vertical direction, the feeding shell comprises an upper cylinder opening and a lower cylinder opening, the lower cylinder opening is connected with the juicing assembly, the ratio of the horizontal projection area of the upper cylinder opening to the horizontal projection area of the extrusion screw is C, and the C satisfies: 0.7≤C≤2.

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