Shaft connection structure and juicer

Abstract

The present invention discloses a shaft connection structure, and also discloses a juicer having the shaft connection structure. The shaft connection structure includes a first connection shaft and a second connection shaft. The first connection shaft is provided with a plugging groove and a first calibration groove. The plugging groove has an inner corner. The first calibration groove penetrates to an adjacent side wall of the plugging groove. Along the recessed direction of the plugging groove, the distance between the first calibration groove and the axis of the first connection shaft gradually decreases. From the plugging groove to the direction of the first calibration groove, the width of the first calibration groove gradually decreases. The second connection shaft is provided with a plugging portion and a plurality of second calibration grooves. A sharp portion is formed between adjacent second calibration grooves. Wherein, when the inner corner is misaligned with the sharp portion, the sharp portion slides into the plugging groove from the first calibration groove, and the sharp portion is in sliding contact with the side wall of the first calibration groove, so that the plugging portion is inserted into the plugging groove. It is possible to facilitate the installation of the screw body while reducing the fitting clearance between the plugging portion and the plugging groove, and reduce the working noise of the juicer.

Description

Technical Field

[0001] The present invention relates to the technical field of juicers, and particularly relates to a shaft connection structure and a juicer. Background Art

[0002] As is well known, existing juicers generally include a base, a motor, a juice cup and a screw body. The motor is arranged on the base, the juice cup is detachably installed on the base, one end of the output shaft of the motor penetrates through the juice cup and is connected to the transmission shaft of the screw body. In order to facilitate the disassembly of the screw body, the transmission shaft of the screw body and the output shaft of the motor are generally connected through a plug-in structure. The plug-in structure includes a plug-in groove arranged on the transmission shaft and a plug-in portion arranged on the output shaft. The cross-sections of both the plug-in groove and the plug-in portion are non-circular structures. One end of the output shaft of the motor is inserted into the plug-in groove and can abut against the side wall of the plug-in groove, so that the output shaft of the motor can drive the transmission shaft to rotate, and the screw body can rotate in the juice cup.

[0003] In order to facilitate the user to insert the screw body, generally, the fitting clearance between the plug-in portion and the plug-in groove is enlarged to reduce the installation difficulty of the screw body. However, when the fitting clearance between the plug-in portion and the plug-in groove increases, the transmission shaft is likely to move left and right relative to the output shaft of the motor, and the transmission shaft and the output shaft of the motor are likely to collide, resulting in a large working noise of the juicer. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a shaft connection structure that can facilitate the installation of the screw body while reducing the fitting clearance between the plug-in portion and the plug-in groove.

[0005] The present invention also provides a juicer having the above shaft connection structure.

[0006] According to an embodiment of the first aspect of the present invention, the shaft connection structure includes:

[0007] A first connecting shaft, provided with a plug-in groove and a first calibration groove. Along the axial direction perpendicular to the first connecting shaft, the cross-section of the plug-in groove is a regular polygon structure. The plug-in groove has inner angles. A plurality of first calibration grooves are configured, and the plurality of first calibration grooves are arranged at intervals along the circumferential direction of the first connecting shaft. The first calibration grooves penetrate through to the adjacent side walls of the plug-in groove. Along the concave direction of the plug-in groove, the distance between the first calibration groove and the axis of the first connecting shaft gradually decreases. From the direction of the plug-in groove to the first calibration groove, the width of the first calibration groove gradually decreases;

[0008] The second connecting shaft is provided with a plug-in portion, wherein the cross section of the plug-in portion matches the cross section of the plug-in slot along an axial direction perpendicular to the second connecting shaft, the second connecting shaft is provided with a plurality of second correction slots, the plurality of second correction slots are arranged at intervals along the circumference of the second connecting shaft, the second correction slots extend to corresponding side surfaces of the second connecting shaft, and sharp portions are formed between adjacent second correction slots, one end of the second connecting shaft is accommodated in the plug-in slot and can move along the circumference of the first connecting shaft;

[0009] When the inner angle is misaligned with the sharp portion, the sharp portion slides from the first correction groove into the plug-in groove, and the sharp portion slides in contact with the side wall of the first correction groove, so that the plug-in portion is inserted into the plug-in groove.

[0010] The shaft connection structure according to the first embodiment of the present invention has at least the following beneficial effects:

[0011] The first connecting shaft is the shaft of the screw body, and the second connecting shaft is the output shaft of the motor. When the user installs the screw body, the first connecting shaft and the second connecting shaft are plugged in. The user cannot accurately determine the relative position of the inner angle and the sharp part. In most cases, the inner angle and the sharp part are misaligned in the circumferential direction and radial direction of the first connecting shaft. By providing the first correction groove and the second correction groove, when the inner angle and the sharp part are misaligned in the circumferential direction of the first connecting shaft, the sharp part is abutted by the side wall of the first correction groove. Since the first correction groove passes through the adjacent side wall of the plug-in groove, the side wall of the first correction groove can The guide sharp portion rotates in the direction close to the inner angle to correct the position of the inner angle and the sharp portion in the circumferential direction of the first connecting shaft. When the inner angle and the sharp portion are misaligned in the radial direction of the first connecting shaft, the distance between the first correction groove and the axis of the first connecting shaft gradually decreases along the recessed direction of the plug-in groove, so that the side wall of the first correction groove can guide the sharp portion to move radially along the first connecting shaft to correct the radial position of the inner angle and the sharp portion in the first connecting shaft. This can facilitate the installation of the screw body and reduce the working noise of the juicer while reducing the fitting clearance between the plug-in portion and the plug-in groove.

[0012] According to some embodiments of the present invention, an intersecting edge is formed between two adjacent first correction grooves, and among the plurality of intersecting edges, the length of one of the intersecting edges is unequal to the length of the remaining intersecting edges.

[0013] According to some embodiments of the present invention, along the recessed direction of the second correction groove, the distance between the wall surface of the second correction groove and the corresponding side surface of the second connecting shaft gradually decreases.

[0014] According to some embodiments of the present invention, the width of the second correction groove gradually decreases from the side surface of the second connecting shaft to the axis of the second connecting shaft.

[0015] According to some embodiments of the present invention, along the axial direction perpendicular to the axial direction of the first connecting shaft, the cross-section of the insertion slot is a regular hexagon structure.

[0016] According to some embodiments of the present invention, the side wall of the first correction slot is joined to the corresponding side wall of the adjacent first correction slot.

[0017] According to some embodiments of the present invention, the sharp part has a side edge, the side edge is located on the side of the sharp part close to the outside of the second connecting shaft, one end of the side edge is connected to the center of the insertion part to form a first side, and the other end of the side edge is connected to the center of the insertion part to form a second side. The included angle α between the first side and the second side satisfies: 0 < α ≤ 3°.

[0018] According to some embodiments of the present invention, along the axial direction of the first connecting shaft, the projection of the inner angle is located at the middle position of the projection of the corresponding first correction slot.

[0019] According to some embodiments of the present invention, the bottom wall of the first correction slot is a curved surface structure.

[0020] According to the embodiment of the second aspect of the present invention, a juicer includes a motor, a screw body, and the shaft connection structure described in the above embodiments. The first connecting shaft is the shaft body of the screw body, and the second connecting shaft is the output shaft of the motor.

[0021] The juicer according to the embodiment of the second aspect of the present invention has at least the following beneficial effects:

[0022] When the user installs the screw body, the first connecting shaft is inserted into the second connecting shaft. The user cannot accurately determine the relative position between the inner angle and the sharp part. In most cases, the inner angle and the sharp part are misaligned both in the circumferential direction and the radial direction of the first connecting shaft. By providing the first correction slot and the second correction slot, when the inner angle and the sharp part are misaligned in the circumferential direction of the first connecting shaft, the sharp part is abutted by the side wall of the first correction slot. Since the first correction slot penetrates to the adjacent side wall of the insertion slot, the side wall of the first correction slot can guide the sharp part to rotate in the direction close to the inner angle to correct the positions of the inner angle and the sharp part in the circumferential direction of the first connecting shaft. When the inner angle and the sharp part are misaligned in the radial direction of the first connecting shaft, since the distance between the first correction slot and the axis of the first connecting shaft gradually decreases along the depression direction of the insertion slot, the side wall of the first correction slot can guide the sharp part to move in the radial direction of the first connecting shaft to correct the positions of the inner angle and the sharp part in the radial direction of the first connecting shaft. It is convenient to install the screw body while reducing the fitting gap between the insertion part and the insertion slot, and reducing the working noise of the juicer.

[0023] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0025] Figure 1 Schematic diagram of the structure of the screw body according to an embodiment of the present invention;

[0026] Figure 2 A top view of a screw body according to an embodiment of the present invention;

[0027] Figure 3 for Figure 2 A partial enlarged view of part A;

[0028] Figure 4 Schematic diagram of the structure of a motor according to an embodiment of the present invention;

[0029] Figure 5 is a front view of a motor according to an embodiment of the present invention;

[0030] Figure 6 A top view of a motor according to an embodiment of the present invention;

[0031] Figure 7 for Figure 6 A partial enlarged view of part B;

[0032] Figure 8 This is a schematic structural diagram of a sharp portion according to an embodiment of the present invention;

[0033] Figure 9 This is a structural diagram of a juicer according to an embodiment of the present invention;

[0034] Figure 10 Schematic diagram of the internal structure of a juicer according to an embodiment of the present invention.

[0035] Reference numerals:

[0036] First connecting axis 100, plug-in slot 110, inner angle 111, first correction slot 120, intersection edge 130;

[0037] The second connecting shaft 200, the plug-in portion 210, the second correction slot 220, the sharp portion 230, the side 231, the first side 232, and the second side 233;

[0038] Screw body 300, motor 400, machine base 500, juice cup 600. DETAILED DESCRIPTION

[0039] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0040] In the description of the present invention, it should be understood that with regard to the orientation description, such as the upper, lower, front, rear, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0041] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0042] In the description of the present invention, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0043] In the related art, existing juicers generally include a base, a motor, a juice extraction cup, and a screw body. The motor is arranged on the base, the juice extraction cup is detachably installed on the base, one end of the output shaft of the motor passes through the juice extraction cup and is connected to the transmission shaft of the screw body. In order to facilitate the disassembly of the screw body, the transmission shaft of the screw body and the output shaft of the motor are generally connected through a plug-in structure. The plug-in structure includes a plug-in groove provided on the transmission shaft and a plug-in portion provided on the output shaft. The cross-sections of both the plug-in groove and the plug-in portion are non-circular structures. One end of the output shaft of the motor is inserted into the plug-in groove and can abut against the side wall of the plug-in groove, so that the output shaft of the motor can drive the transmission shaft to rotate, enabling the screw body to rotate in the juice extraction cup. In order to facilitate the user to insert and install the screw body, generally, the fitting clearance between the plug-in portion and the plug-in groove is enlarged to reduce the installation difficulty of the screw body. However, when the fitting clearance between the plug-in portion and the plug-in groove increases, the transmission shaft is likely to move left and right relative to the output shaft of the motor, and the transmission shaft and the output shaft of the motor are likely to collide, resulting in a large working noise of the juicer.

[0044] Refer to Figures 1 to 7, the shaft connection structure according to the first aspect embodiment of the present invention includes a first connecting shaft 100 and a second connecting shaft 200. The first connecting shaft 100 is provided with a plugging groove 110 and a first calibration groove 120. Along the axial direction perpendicular to the first connecting shaft 100, the cross-section of the plugging groove 110 is a regular polygon structure. The plugging groove 110 has an inner angle 111. There are multiple first calibration grooves 120 configured, and the multiple first calibration grooves 120 are arranged at intervals along the circumferential direction of the first connecting shaft 100. The first calibration grooves 120 penetrate through to the adjacent side walls of the plugging groove 110. Along the recessed direction of the plugging groove 110, the distance between the first calibration groove 120 and the axis of the first connecting shaft 100 gradually decreases. From the direction of the plugging groove 110 to the first calibration groove 120, the width of the first calibration groove 120 gradually decreases. The second connecting shaft 200 is provided with a plugging portion 210. Along the axial direction perpendicular to the second connecting shaft 200, the cross-section of the plugging portion 210 matches the cross-section of the plugging groove 110. The second connecting shaft 200 is provided with multiple second calibration grooves 220, and the multiple second calibration grooves 220 are arranged at intervals along the circumferential direction of the second connecting shaft 200. The second calibration grooves 220 penetrate through to the corresponding side surfaces of the second connecting shaft 200. A sharp portion 230 is formed between adjacent second calibration grooves 220. One end of the second connecting shaft 200 is received in the plugging groove 110 and can move along the circumferential direction of the first connecting shaft 100. Wherein, when the inner angle 111 is misaligned with the sharp portion 230, the sharp portion 230 slides into the plugging groove 110 from the first calibration groove 120, and the sharp portion 230 is in sliding contact with the side wall of the first calibration groove 120, so that the plugging portion 210 is inserted into the plugging groove 110. In this way, it is possible to facilitate the installation of the screw body 300 while reducing the fitting gap between the plugging portion 210 and the plugging groove 110, and reduce the working noise of the juicer.

[0045] Specifically, the first connecting shaft 100 is the shaft of the screw body 300, and the second connecting shaft 200 is the output shaft of the motor 400. When the user installs the screw body 300, the first connecting shaft 100 and the second connecting shaft 200 are plugged in. The user cannot accurately determine the relative position of the inner angle 111 and the sharp portion 230. In most cases, the inner angle 111 and the sharp portion 230 are misaligned in the circumferential direction and radial direction of the first connecting shaft 100. By providing the first correction groove 120 and the second correction groove 220, when the inner angle 111 and the sharp portion 230 are misaligned in the circumferential direction of the first connecting shaft 100, the sharp portion 230 is abutted by the side wall of the first correction groove 120. Since the first correction groove 120 passes through the adjacent side wall of the plug-in groove 110, the first correction groove 120 The side wall can guide the sharp portion 230 to rotate in the direction close to the inner corner 111 to correct the position of the inner corner 111 and the sharp portion 230 in the circumferential direction of the first connecting shaft 100. When the inner corner 111 and the sharp portion 230 are misaligned in the radial direction of the first connecting shaft 100, the distance between the first correction groove 120 and the axis of the first connecting shaft 100 gradually decreases along the recessed direction of the plug-in groove 110, so that the side wall of the first correction groove 120 can guide the sharp portion 230 to move radially along the first connecting shaft 100 to correct the radial position of the inner corner 111 and the sharp portion 230 in the first connecting shaft 100. It can facilitate the installation of the screw body 300 and reduce the working noise of the juicer while reducing the fitting clearance between the plug-in portion 210 and the plug-in groove 110.

[0046] In some embodiments of the present invention, an intersection edge 130 is formed between two adjacent first correction grooves 120. Among the multiple intersection edges 130, the length of one intersection edge 130 is not equal to the length of the remaining intersection edges 130, which can avoid multiple sharp portions 230 from contacting the wall of the first correction groove 120 at the same time, so as to facilitate the correction of the relative position of the sharp portion 230 and the inner corner 111.

[0047] Specifically, among the multiple intersection edges 130, the length of one intersection edge 130 is shorter than the lengths of the remaining intersection edges 130, so that the inclination angle of the wall of the first correction groove 120 next to the shorter intersection edge 130 is different from the inclination angle of the wall of the other first correction grooves 120. When the inner angle 111 and the sharp portion 230 are misaligned, the tip of the sharp portion 230 abuts the wall of the first correction groove 120 next to the shorter intersection edge 130 first, thereby reducing the resistance when the plug-in portion 210 is inserted into the plug-in slot 110, which can facilitate the insertion of the plug-in portion 210 into the plug-in slot 110.

[0048] It should be noted that the length of the intersection edge 130 refers to the dimension of the intersection edge 130 in the axial direction of the first connecting shaft 100 , which will not be described in detail here.

[0049] It should be noted that the lengths of two of the intersecting edges 130 may be shorter than the lengths of the other intersecting edges 130 , which is not limited here.

[0050] In some embodiments of the present invention, the second correction groove 220 passes through the side and end faces of the second connecting shaft 200. Along the recessed direction of the second correction groove 220, the distance between the wall of the second correction groove 220 and the corresponding side face of the second connecting shaft 200 gradually decreases, which can improve the overall structural strength of the plug-in part 210 and improve the service life of the second connecting shaft 200.

[0051] In some embodiments of the present invention, the width of the second correction groove 220 gradually decreases from the side of the second connecting shaft 200 to the axis of the second connecting shaft 200, which can improve the structural strength of the sharp portion 230 to avoid the occurrence of breakage of the sharp portion 230 and improve the service life of the second connecting shaft 200.

[0052] Specifically, along the concave direction of the second correction groove 220 , the width of the first sharp portion 230 gradually increases, which can improve the structural strength of the sharp portion 230 to avoid the sharp portion 230 from breaking, and can increase the service life of the second connecting shaft 200 .

[0053] In some embodiments of the present invention, along the axial direction perpendicular to the first connecting shaft 100, the cross-section of the plug-in slot 110 is a regular hexagonal structure, and the cross-section of the plug-in portion 210 is a corresponding regular hexagonal structure, so that the side of the second connecting shaft 200 matches any side wall of the plug-in slot 110. The side of the second connecting shaft 200 does not need to correspond to any side wall of the plug-in slot 110, which can facilitate the connection between the first connecting shaft 100 and the second connecting shaft 200.

[0054] It should be noted that, along the axial direction perpendicular to the first connecting axis 100 , the cross section of the plug slot 110 may also be a square structure or a regular pentagonal structure, etc., which is not limited here.

[0055] In some embodiments of the present invention, the side walls of the first correction groove 120 intersect with the corresponding side walls of the adjacent first correction groove 120 to form an intersecting edge 130, which can reduce the width of the intersecting edge 130 to reduce the probability of the tip of the sharp portion 230 abutting against the intersecting edge 130, thereby facilitating the insertion of the plug-in portion 210 into the plug-in groove 110.

[0056] Reference Figure 8In some embodiments of the present invention, the sharp portion 230 has a side edge 231, which is located on the side of the sharp portion 230 close to the outer side of the second connecting axis 200. One end of the side edge 231 is connected to the center of the plug-in portion 210 to form a first edge 232, and the other end of the side edge 231 is connected to the center of the plug-in portion 210 to form a second edge 232. The angle between the first edge 231 and the second edge 232 is α, satisfying: 0<α≤3°, which can reduce the probability of the side edge 231 abutting against the intersection edge 130, so as to facilitate the insertion of the plug-in portion 210 into the plug-in slot 110.

[0057] Specifically, taking the cross section of the plug-in portion 210 as the circumscribed circle, when α is 1°, the sum of the central angles occupied by the six side edges 231 is 6°. At this time, the side edges 231 have only a one-sixtieth probability of abutting the intersection edge 130. When α is 2°, the sum of the central angles occupied by the six side edges 231 is 12°. At this time, the side edges 231 have only a one-thirtieth probability of abutting the intersection edge 130. This can reduce the probability of the side edges 231 abutting the intersection edge 130, so that the plug-in portion 210 can be inserted into the plug-in slot 110, so that only the side edges 231 of the sharp portion 230 abut against the side walls of the first correction slot 120, so that the side edges of the sharp portion 230 can avoid contact with the side walls of the first correction slot 120, thereby reducing the sliding resistance of the sharp portion 230, so that the plug-in portion 210 can be inserted into the plug-in slot 110.

[0058] In some embodiments of the present invention, along the axial direction of the first connecting axis 100, the projection of the inner angle 111 is located in the middle position of the projection of the corresponding first correction groove 120. When the tip of the sharp portion 230 abuts against one side of the first correction groove 120, the tip of the sharp portion 230 can slide smoothly toward the middle position of the first correction groove 120, which can facilitate the insertion of the plug-in portion 210 into the plug-in groove 110.

[0059] In some embodiments of the present invention, the bottom wall of the first correction groove 120 is a curved structure, which can prevent the tip of the sharp portion 230 from being stuck with the bottom wall of the first correction groove 120, thereby facilitating the insertion of the plug-in portion 210 into the plug-in groove 110.

[0060] Specifically, along the axial direction perpendicular to the first connecting axis 100, the cross-section of the first correction groove 120 is a V-shaped structure, and the bottom of the first correction groove 120 is an arc-shaped structure, which can avoid the tip of the sharp portion 230 from being stuck with the bottom wall of the first correction groove 120, thereby facilitating the insertion of the plug-in portion 210 into the plug-in groove 110.

[0061] Reference Figure 9 、 Figure 10, A juicer according to an embodiment of the second aspect of the present invention includes a motor 400, a screw body 300, and the shaft connection structure of the embodiment of the first aspect of the present invention. The first connecting shaft 100 is the shaft body of the screw body 300, and the second connecting shaft 200 is the output shaft of the motor 400.

[0062] Specifically, when the user installs the screw body 300, the first connecting shaft 100 and the second connecting shaft 200 are inserted. The user cannot accurately determine the relative position of the inner angle 111 and the sharp part 230. In most cases, the inner angle 111 and the sharp part 230 are misaligned both in the circumferential direction and the radial direction of the first connecting shaft 100. By providing the first calibration groove 120 and the second calibration groove 220, when the inner angle 111 and the sharp part 230 are misaligned in the circumferential direction of the first connecting shaft 100, the sharp part 230 is abutted by the side wall of the first calibration groove 120. Since the first calibration groove 120 penetrates to the adjacent side wall of the insertion groove 110, the side wall of the first calibration groove 120 can guide the sharp part 230 to rotate in the direction close to the inner angle 111 to correct the position of the inner angle 111 and the sharp part 230 in the circumferential direction of the first connecting shaft 100. When the inner angle 111 and the sharp part 230 are misaligned in the radial direction of the first connecting shaft 100, since along the depression direction of the insertion groove 110, the distance between the first calibration groove 120 and the axis of the first connecting shaft 100 gradually decreases, the side wall of the first calibration groove 120 can guide the sharp part 230 to move in the radial direction of the first connecting shaft 100 to correct the position of the inner angle 111 and the sharp part 230 in the radial direction of the first connecting shaft 100. It is possible to facilitate the installation of the screw body 300 while reducing the fitting gap between the insertion part 210 and the insertion groove 110, and reduce the working noise of the juicer.

[0063] It should be noted that the juicer further includes a base 500 and a juice cup 600. The motor 400 is arranged on the base 500. The juice cup 600 is detachably installed on the base 500. The second connecting shaft 200 passes through the juice cup 600, and the second connecting shaft 200 is connected to the first connecting shaft 100 through the cooperation of the insertion groove 110 and the insertion part 210, which will not be elaborated here.

[0064] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0065] The above has described this embodiment in detail with reference to the drawings, but the present invention is not limited to the above embodiment. Within the knowledge scope of those of ordinary skill in the art in the technical field, various changes can also be made without departing from the purpose of the present invention.

Claims

1. A shaft connection structure for a juicer, characterized in that, The shaft connection structure includes: A first connecting shaft (100) provided with a plugging slot (110) and a first calibration slot (120). Along the axial direction perpendicular to the first connecting shaft (100), the cross-section of the plugging slot (110) is a regular polygon structure. The plugging slot (110) has interior angles (111). A plurality of first calibration slots (120) are configured. The plurality of first calibration slots (120) are arranged at intervals along the circumferential direction of the first connecting shaft (100). The first calibration slots (120) penetrate through to the adjacent side walls of the plugging slot (110). Along the depression direction of the plugging slot (110), the distance between the first calibration slot (120) and the axis of the first connecting shaft (100) gradually decreases. From the direction of the plugging slot (110) to the first calibration slot (120), the width of the first calibration slot (120) gradually decreases; A second connecting shaft (200) provided with a plugging portion (210). Along the axial direction perpendicular to the second connecting shaft (200), the cross-section of the plugging portion (210) matches the cross-section of the plugging slot (110). The second connecting shaft (200) is provided with a plurality of second calibration slots (220). The plurality of second calibration slots (220) are arranged at intervals along the circumferential direction of the second connecting shaft (200). The second calibration slots (220) penetrate through to the corresponding side surfaces of the second connecting shaft (200). A sharp portion (230) is formed between adjacent second calibration slots (220). One end of the second connecting shaft (200) is received in the plugging slot (110) and can move along the circumferential direction of the first connecting shaft (100); Wherein, when the interior angle (111) is misaligned with the sharp portion (230), the sharp portion (230) slides into the plugging slot (110) from the first calibration slot (120), and the sharp portion (230) is in sliding contact with the side wall of the first calibration slot (120) so that the plugging portion (210) is inserted into the plugging slot (110).

2. The shaft connection structure according to claim 1, wherein, A connecting edge (130) is formed between two adjacent first calibration slots (120). Among the plurality of connecting edges (130), the length of one of the connecting edges (130) is not equal to the lengths of the remaining connecting edges (130).

3. The shaft connection structure according to claim 1, characterized in that Along the depression direction of the second calibration slot (220), the distance between the wall surface of the second calibration slot (220) and the corresponding side surface of the second connecting shaft (200) gradually decreases.

4. The shaft connection structure according to claim 1, characterized in that From the direction of the side surface of the second connecting shaft (200) to the axis of the second connecting shaft (200), the width of the second calibration slot (220) gradually decreases.

5. The shaft connection structure according to claim 1, characterized in that Along the axial direction perpendicular to the first connecting shaft (100), the cross-section of the plugging slot (110) is a regular hexagon structure.

6. The shaft connection structure according to claim 1, characterized in that The side wall of the first calibration slot (120) intersects with the corresponding side wall of the adjacent first calibration slot (120).

7. The shaft connection structure according to claim 1, characterized in that, The pointed part (230) has a side (231) which is located on the outer side of the pointed part (230) close to the second connecting shaft (200). One end of the side (231) is connected to the center of the plugging part (210) to form a first side (232), and the other end of the side (231) is connected to the center of the plugging part (210) to form a second side (232). The included angle α between the first side (231) and the second side (232) satisfies: 0 < α ≤ 3°.

8. The shaft connection structure according to claim 1, wherein, Axially along the first connecting shaft (100), the projection of the inner angle (111) is located at the middle position of the projection of the corresponding first calibration groove (120).

9. The shaft connection structure according to claim 1, characterized in that The bottom wall of the first calibration groove (120) is a curved surface structure.

10. A juicer, characterized in that, It includes a motor (400), a screw body (300) and the shaft connection structure according to any one of claims 1 to 9, wherein the first connecting shaft (100) is the shaft body of the screw body (300), and the second connecting shaft (200) is the output shaft of the motor (400).

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