A juicer

Abstract

The present invention relates to the technical field of food processing machines, and in particular to a juicer, which includes a machine base, an upper cover connected to the machine base, and an upper juicer head connected to the upper cover, and also includes a transmission shaft and a lower juicer head; the transmission shaft extends upward from the machine base, the lower juicer head is connected to the transmission shaft and is driven to rotate by the transmission shaft; the upper juicer head is slidably connected to the upper cover and is circumferentially fixed relative to the upper cover; one of the upper juicer head and the lower juicer head is provided with an external thread and the other is provided with an internal thread, and when the upper cover is closed with the machine base, the external thread and the internal thread are screwed together, and as the lower juicer head rotates, the distance between the lower juicer head and the upper juicer head changes. This juicer can solve the problem in the prior art that the hinge or lock is easily damaged or loosened due to the continuous upward push of the lower juicer head, thereby affecting the service life of the juicer.

Description

Technical Field

[0001] The present invention relates to the technical field of food processing machines, in particular to a juicer. Background Art

[0002] With the continuous improvement of people's living standards and the continuous development of technology, there are more and more types of food processing machines. Among them, in order to more conveniently squeeze the juice of orange fruits, a juicer has appeared in the prior art.

[0003] An orange juicer generally includes an upper juicing head and a lower juicing head. After a cut orange is placed between the upper and lower juicing heads, the upper and lower juicing heads move closer together and squeeze the orange to extract the juice. Currently, the drive motor of commercially available juicers is generally mounted on the base, which drives a lifting mechanism. The upper juicing head is mounted on the upper cover. To move the upper and lower juicing heads closer together, the lower juicing head is mounted on the lifting mechanism. After the upper cover and the base are properly installed, the lifting mechanism drives the lower juicing head to move closer to and away from the upper juicing head. Similar juicers can refer to existing technologies such as Chinese Utility Model Patent ZL2023200489794 or Chinese Utility Model Patent ZL2021211250063.

[0004] Based on the above-mentioned action principle, the existing technology has the following problems: since the lower juicing head is constantly pushed upward, the upper juicing head and the upper cover will be continuously subjected to the upward force transmitted by the lower juicing head when juicing, and the upper cover is not fixedly connected to the machine base. The upper cover and the machine base are generally connected in a flip-up manner through hinges and locks. After the juicer is used for a long time, the hinges or locks are prone to damage or loosening, which affects the service life of the juicer. Summary of the Invention

[0005] The object of the present invention is to provide a juicer, aiming to solve the problem in the prior art that the hinge or lock is easily damaged or loosened due to the continuous upward push of the lower juice extraction head, thereby affecting the service life of the juicer.

[0006] In order to achieve the above-mentioned objectives, the present invention provides a juicer, comprising a machine base, an upper cover connected to the machine base and an upper juicing head connected to the upper cover, which also includes a transmission shaft and a lower juicing head; the transmission shaft extends upward from the machine base, the lower juicing head is connected to the transmission shaft and can be driven to rotate by the transmission shaft; the upper juicing head is slidably connected to the upper cover and the upper juicing head is circumferentially fixed relative to the upper cover; among the upper juicing head and the lower juicing head, one is provided with an external thread and the other is provided with an internal thread. When the upper cover is closed with the machine base, the external thread and the internal thread are screwed together, and the distance between the lower juicing head and the upper juicing head changes as the lower juicing head rotates.

[0007] Furthermore, a first spring is connected between the upper juicing head and the upper cover, and the first spring causes the upper juicing head to tend to move away from the upper cover.

[0008] Furthermore, the juicer also includes a motor arranged in the base, the motor is electrically connected to a reversing switch, and the motor drives the transmission shaft to rotate; a juice collecting tray is provided on the top of the base, the juice collecting tray supports the lower juicing head from bottom to top, the transmission shaft passes through the juice collecting tray and can move up and down relative to the juice collecting tray, the transmission shaft is connected to a second spring, and the second spring causes the transmission shaft to tend to move to a high position; the lower juicing head is provided with a transmission hole extending from bottom to top along its axial direction, the transmission shaft extends into the transmission hole and can move up and down relative to the transmission hole, and a detachable transmission structure is provided between the transmission hole and the transmission shaft, and the detachable transmission structure has a coupled state and a disengaged state; when the transmission shaft is in a high position and the detachable transmission structure is in a coupled state, the transmission shaft drives the lower juicing head to rotate; when the lower juicing head rotates in the direction of the screw engagement until it can no longer rotate, as the transmission shaft continues to rotate, the detachable transmission structure changes to a disengaged state and the transmission shaft moves to a low position and presses the reversing switch.

[0009] Furthermore, a mounting seat is provided below the juice collection plate, the second spring is compressed between the mounting seat and the transmission shaft and causes the transmission shaft to tend to move to a high position, and the reverse switch is connected to the mounting seat; the transmission shaft is provided with a pressing part, and when the transmission shaft moves to a low position, the pressing part directly or indirectly presses the reverse switch.

[0010] Furthermore, the elastic force of the first spring is greater than the elastic force of the second spring.

[0011] Furthermore, a main gear is fixedly connected to the bottom circumference of the transmission shaft, the motor is connected to the mounting seat, and the mounting seat is provided with a transmission gear set. The output shaft of the motor and the main gear are connected by means of the transmission gear set. When the transmission shaft moves up and down, the main gear and the transmission gear set remain engaged.

[0012] Furthermore, when the transmission shaft and the transmission hole are cut with the rotation plane of the transmission shaft, the resulting cross-sections are all circular; the detachable transmission structure includes at least one transmission protrusion arranged on the top of the transmission shaft and at least one connecting transmission recess arranged on the top of the transmission hole, the transmission protrusion is provided with a first transmission vertical surface and a first transmission inclined surface, and the transmission recess is provided with a second transmission vertical surface and a second transmission inclined surface; when the detachable transmission structure is in a coupled state, the first transmission vertical surface contacts the second transmission vertical surface, and the first transmission inclined surface contacts the second transmission vertical surface; when the lower juicer head rotates in the direction of screw engagement until it can no longer rotate, as the transmission shaft continues to rotate, the transmission shaft moves downward with the help of the transmission of the first transmission inclined surface and the second transmission inclined surface.

[0013] Furthermore, the first transmission slope includes a first slope segment located higher and a second slope segment connected to the bottom of the first slope segment. The angle between the first slope segment and the rotation plane of the transmission shaft is 40-50 degrees, and the angle between the second slope segment and the rotation plane of the transmission shaft is 75-85 degrees.

[0014] Furthermore, a sliding guide structure is provided between the upper cover and the upper juicer head, the upper cover is provided with a through hole, and a mounting column is provided on the top of the upper juicer head. The mounting column passes through the through hole from bottom to top, and the top of the mounting column is connected with an anti-slip screw. The first spring is sleeved on the mounting column and is compressed between the upper cover and the upper juicer head.

[0015] Furthermore, the outer periphery of the upper juice extraction head is provided with a first enclosure plate extending downward, and the outer side surface of the first enclosure plate is provided with an external thread; the outer periphery of the lower juice extraction head is provided with a receiving plate extending outward, and the outer periphery of the receiving plate is provided with a second enclosure plate extending upward, and the inner side surface of the second enclosure plate is provided with an internal thread, and the receiving plate is provided with a water hole running through its thickness direction.

[0016] The juicer provided by the present invention utilizes the principle of screw thread engagement to bring the upper juicing head and the lower juicing head closer to or farther away from each other; when juicing, the lower juicing head rotates, while the upper juicing head cannot rotate and can only slide up and down. The upper juicing head approaches the lower juicing head under the action of the screw thread. Since the lower juicing head is at the bottom, the upper juicing head slides from top to bottom, and the upper juicing head will not push up the upper cover. Therefore, the upper cover will not be subjected to upward force as in the prior art, the hinges or the locks are not easily damaged, and the service life of the juicer is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 It is an exploded structural diagram of the present invention;

[0019] Figure 3 is a cross-sectional view of the present invention in a first direction;

[0020] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle;

[0021] Figure 5 is a cross-sectional view of the present invention in a second direction;

[0022] Figure 6 yes Figure 5 A partial enlarged view of point B in the middle;

[0023] Figure 7 It is the decomposition structure of some components of the present invention Figure 1 ;

[0024] Figure 8 yes Figure 7 A partial enlarged view of point C in the middle;

[0025] Figure 9 It is the decomposition structure of some components of the present invention Figure 2 ;

[0026] Figure 10 It is the three-dimensional structure of the lower juicer head Figure 1 ;

[0027] Figure 11 It is the three-dimensional structure of the lower juicer head Figure 2 ;

[0028] Figure 12 This is a front view of the transmission boss on top of the transmission shaft.

[0029] Description of reference numerals:

[0030] 1. Machine base; 11. Juice collection tray;

[0031] 2. Upper cover; 21. First spring; 22. Through hole;

[0032] 3. Upper juicer head; 31. External thread; 32. Mounting column; 33. Anti-slip screw; 34. First enclosure;

[0033] 4. Lower juicer head; 41. Internal thread; 42. Transmission hole; 43. Transmission recess; 44. Adapter plate; 441. Water hole; 45. Second enclosure plate;

[0034] 5. Transmission shaft; 51. Second spring; 52. Pressing portion; 53. Main gear; 54. Transmission protrusion; 541. First transmission vertical surface; 542. First inclined surface segment; 543. Second inclined surface segment;

[0035] 6. Motor; 61. Reverse switch; 62. Mounting base; 621. Base cover; 63. Transmission gear set; 64. Pry bar. DETAILED DESCRIPTION

[0036] The present invention is described in detail below with reference to specific embodiments.

[0037] In the present invention, unless otherwise expressly specified and limited, when terms such as "set on", "connected", and "connected" appear, these terms should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected or connected through one or more intermediate media. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The directional words that appear in the present invention are to better illustrate the characteristics of the features and the relationship between the features. It should be understood that when the placement direction of the present invention changes, the characteristics of the features and the direction of the relationship between the features also change accordingly. Therefore, the directional words do not constitute an absolute limitation on the characteristics of the features and the relationship between the features in space, but only play a relative limitation role.

[0038] The present invention provides a juicer, such as Figures 1 to 12 As shown, it includes a base 1, an upper cover 2 connected to the base 1, and an upper juice extraction head 3 connected to the upper cover 2. It also includes a transmission shaft 5 and a lower juice extraction head 4. The upper cover 2 and the base 1 can be connected by a hinged connection on one side and a snap connection on the other side, or a detachable connection in which the upper cover 2 can be completely detached from the base 1 and reattached, or a common connection method in the prior art.

[0039] In this embodiment, the transmission shaft 5 extends upward from the base 1. The lower juicer head 4 is connected to the transmission shaft 5 and can be rotated by the transmission shaft 5. The upper juicer head 3 is slidably connected to the upper cover 2 and is circumferentially fixed relative to the upper cover 2. This circumferential fixation means that the upper juicer head 3 cannot rotate relative to the upper cover 2. One of the upper juicer head 3 and the lower juicer head 4 is provided with an external thread 31, and the other is provided with an internal thread 41. When the upper cover 2 is covered with the base 1, the external thread 31 and the internal thread 41 are screwed together. As the lower juicer head 4 rotates, the distance between the lower juicer head 4 and the upper juicer head 3 changes. Similar to the common screw connection structure in the prior art, in order to achieve screw connection, one of the two components must be able to rotate relative to the other component, and one component must be able to move relative to the other component in a direction parallel to the axis of rotation. In this way, screw connection can be achieved. Correspondingly, in this embodiment, the upper juicing head 3 provides relative movement, and the lower juicing head 4 provides relative rotation, so the upper juicing head 3 can be screwed together with the lower juicing head 4.

[0040] Based on the above-described structural arrangement, this juicer utilizes the principle of screw thread engagement to move the upper and lower juicing heads 3 and 4 closer or further apart. During juicing, the lower juicing head 4 rotates, while the upper juicing head 3 cannot rotate and can only slide up and down. The upper juicing head 3 approaches the lower juicing head 4 due to the action of the screw thread. Since the lower juicing head 4 is located below, the upper juicing head 3 slides from top to bottom, and the upper juicing head 3 does not push up against the upper cover 2. Therefore, the upper cover 2 is not subjected to upward force as in the prior art, and the hinges and locks are less susceptible to damage, thereby extending the service life of the juicer. Furthermore, this juicer uses a spinning method to juice orange fruits, which provides better juicing results.

[0041] In this embodiment, a first spring 21 is connected between the upper juicing head 3 and the upper cover 2. The first spring 21 forces the upper juicing head 3 away from the upper cover 2. After the upper cover 2 is closed, the first spring 21 allows the threads of the upper juicing head 3 to quickly engage with the threads of the lower juicing head 4, ensuring a smooth threaded engagement. Of course, the first spring 21 can also be omitted; the upper juicing head 3 will fall downward under the action of gravity, and the threads of the upper juicing head 3 and the lower juicing head 4 will still engage.

[0042] In this embodiment, the juicer further includes a motor 6 disposed within the base 1. The motor 6 is electrically connected to a reversing switch 61, and the motor 6 drives the transmission shaft 5 to rotate. It is preferred that the motor 6 be used as the power source for juicing. Of course, it is also possible not to provide the motor 6. For example, in a common hand-cranked juicer in the prior art, a handle is used to drive the transmission shaft 5 to rotate. Juicing can also be achieved based on the structure provided in this embodiment. During juicing, if the pulp has been completely squeezed out of the juice and compacted or screwed to the end, the lower juicing head 4 will not be able to continue rotating. Since the upper juicing head 3 in this embodiment cannot rotate either, the above situation may cause the upper juicing head 3 and the lower juicing head 4 to lock, damage the motor 6, or damage other components. For this reason, a reversing switch 61 is provided in this embodiment. When the reversing switch 61 is triggered, the lower juicing head 4 reverses, and the upper juicing head 3 and the lower juicing head 4 are disengaged.

[0043] To trigger the reverse switch 61, a juice collection tray 11 is provided on the top of the machine base 1. The juice collection tray 11 supports the lower juicing head 4 from below to prevent it from moving downward. A drive shaft 5 passes through the juice collection tray 11 and is able to move up and down relative to the juice collection tray 11. A second spring 51 is connected to the drive shaft 5, which tends to move the drive shaft 5 to a high position. The lower juicing head 4 is provided with a transmission hole 42 extending axially from bottom to top. The drive shaft 5 extends into the transmission hole 42 and is able to move up and down relative to the transmission hole 42. A detachable transmission structure is provided between the transmission hole 42 and the drive shaft 5. The detachable transmission structure has an engaged state and a disengaged state. When the drive shaft 5 is in the high position and the detachable transmission structure is in the engaged state, the drive shaft 5 drives the lower juicing head 4 to rotate. When the lower juicing head 4 rotates in the screw-engaged direction until it can no longer rotate, as the drive shaft 5 continues to rotate, the detachable transmission structure changes to the disengaged state, and the drive shaft 5 moves to the low position, pressing the reverse switch 61. Based on the above structure, when the lower juicing head 4 stops rotating but the transmission shaft 5 continues to rotate, the transmission shaft 5 is disconnected from the lower juicing head 4 due to the force of the motor 6. To achieve this, the transmission shaft 5 moves downward a certain distance and presses the reverse switch 61, thereby reversing the rotation of the motor 6. The above structure and operating principle can prevent locking and protect components.

[0044] In this embodiment, a mounting seat 62 is provided below the juice collection tray 11. The second spring 51 is compressed between the mounting seat 62 and the transmission shaft 5, causing the transmission shaft 5 to move to the upper position. The reverse switch 61 is connected to the mounting seat 62. The transmission shaft 5 is provided with a pressing portion 52. When the transmission shaft 5 moves to the lower position, the pressing portion 52 directly or indirectly presses the reverse switch 61. Preferably, a pry bar 64 is hingedly connected to the mounting seat 62. The two ends of the pry bar 64 are respectively opposite to the pressing portion 52 and the reverse switch 61. When the pressing portion 52 presses the pry plate 64, the reverse switch 61 is indirectly pressed. Of course, the reverse switch 61 can also be directly mounted in a position where the pressing portion 52 can press.

[0045] In this embodiment, the elastic force of the first spring 21 is greater than the elastic force of the second spring 51. As previously described, since the first spring 21 applies downward pressure to the upper juicing head 3, and the upper juicing head 3 transmits the pressure to the lower juicing head 4, and based on the aforementioned pressing principle of the reverse switch 61, if the elastic force of the second spring 51 is greater than the elastic force of the first spring 21, when the lower juicing head 4 stops rotating, the subsequent movement will not be downward movement of the transmission shaft 5, but rather the compression of the second spring 51 and the upward movement of the lower juicing head 4, which will prevent the reverse switch 61 from being pressed. Therefore, the elastic force of the first spring 21 needs to be greater than the elastic force of the second spring 51.

[0046] In this embodiment, a main gear 53 is circumferentially fixedly connected to the bottom of the transmission shaft 5. This circumferential fixation means that the main gear 53 and the transmission shaft 5 rotate synchronously. The motor 6 is connected to a mounting base 62, which is provided with a transmission gear set 63. The output shaft of the motor 6 is connected to the main gear 53 via the transmission gear set 63. When the transmission shaft 5 moves up and down, the main gear 53 and the transmission gear set 63 remain in meshing engagement. Based on this structure, the motor 6 drives the transmission shaft 5 to rotate through the transmission gear set 63 and the main gear 53. Preferably, a seat cover 621 is installed on the top of the mounting seat 62, and the transmission shaft 5 passes through the seat cover 621. The seat cover 621 wraps the main gear 53 and the transmission gear set 63 in the mounting seat 62 to prevent external debris from interfering with the transmission. The seat cover 621 also serves to limit the upward movement of the transmission shaft 5. The seat cover 621 presses against the main gear 53 from top to bottom, and the second spring 51 is compressed between the main gear 53 and the mounting seat 62. The elastic force of the second spring 51 keeps the main gear 53 close to the seat cover 621 and places the transmission shaft 5 in a high position.

[0047] In this embodiment, the transmission shaft 5 and the transmission hole 42 are cut with the rotation plane of the transmission shaft 5, and the resulting cross-sections are all circular. The circular cross-section enables the transmission shaft 5 to rotate relative to the transmission hole 42, so that the detachable transmission structure can be changed from a coupled state to a separated state; the detachable transmission structure includes at least one transmission protrusion 54 arranged at the top of the transmission shaft 5 and at least one connecting transmission recess 43 arranged at the top of the transmission hole 42, the transmission protrusion 54 is provided with a first transmission vertical surface 541 and a first transmission inclined surface, and the transmission recess 43 is provided with a second transmission vertical surface and a second transmission inclined surface; when the detachable transmission structure is in the coupled state, the first transmission vertical surface 541 contacts the second transmission vertical surface, and the first transmission inclined surface contacts the second transmission vertical inclined surface; when the lower juicer head 4 rotates in the direction of the screw engagement until it can no longer rotate, as the transmission shaft 5 continues to rotate, the transmission shaft 5 moves downward with the help of the transmission of the first transmission inclined surface and the second transmission inclined surface. Based on the above structure, during the screwing of the upper and lower juicing heads 3 and 4, the first and second transmission bevels maintain full contact thanks to the action of the second spring 51. This full contact is sufficient to transmit the screwing force required for juicing. When the lower juicing head 4 can no longer rotate, the cooperation between the first and second transmission bevels enables the transmission shaft 5 to overcome the elastic force of the second spring 51 and move downward. When the motor 6 reverses, the first transmission vertical surface 541 contacts the second transmission vertical surface and transmits the force required to disengage the screwing. Preferably, the first transmission bevel includes a first bevel section 542 located at the upper end and a second bevel section 543 connected to the bottom of the first bevel section 542. The angle between the first bevel section 542 and the rotation plane of the transmission shaft 5 is 40-50 degrees, and the angle between the second bevel section 543 and the rotation plane of the transmission shaft 5 is 75-85 degrees. After testing, setting the first transmission bevel to the above structure has the best performance.

[0048] In this embodiment, a sliding guide structure is provided between the upper cover 2 and the upper juicing head 3. Specifically, one of the two structures may be provided with a vertical slide groove, and the other with a vertical slide bar. The slide bar slides within the slide groove, thereby achieving the structural requirement that the upper juicing head 3 cannot rotate relative to the upper cover 2 but can slide relative to the upper cover 2. The upper cover 2 is provided with a through hole 22, and the top of the upper juicing head 3 is provided with a mounting post 32. The mounting post 32 extends upward through the through hole 22. The top of the mounting post 32 is connected to an anti-slip screw 33. The first spring 21 is sleeved on the mounting post 32 and is compressed between the upper cover 2 and the upper juicing head 3.

[0049] In this embodiment, the outer periphery of the upper juicing head 3 is provided with a first enclosing plate 34 extending downward, and the outer side surface of the first enclosing plate 34 is provided with external threads 31. The outer periphery of the lower juicing head 4 is provided with a receiving plate 44 extending outward, and the outer periphery of the receiving plate 44 is provided with a second enclosing plate 45 extending upward, and the inner side surface of the second enclosing plate 45 is provided with internal threads 41. The receiving plate 44 is provided with water holes 441 extending through its thickness. Through the above structure, the upper juicing head 3 and the lower juicing head 4 are provided with internal threads 41 and external threads 31, respectively. A storage space is formed between the upper juicing head 3, the lower juicing head 4, the first enclosing plate 34, the second enclosing plate 45, and the receiving plate 44. Orange fruits are placed in the storage space and juiced. The squeezed juice enters the space and falls onto the receiving plate 44. Then, it falls downward through the water holes 441 in the receiving plate 44 to the juice collection tray 11.

[0050] In summary, this juicer can solve the problem in the prior art that the hinge or lock is easily damaged or loosened due to the continuous upward push of the lower juicer head, which affects the service life of the juicer.

[0051] In the absence of conflict, the above embodiments and features therein may be combined with each other.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A juicer, comprising a base (1), an upper cover (2) connected to the base (1), and an upper juice extraction head (3) connected to the upper cover (2), characterized in that: It also includes a transmission shaft (5) and a lower juice extraction head (4); The transmission shaft (5) extends upward from the machine base (1), and the lower juice extraction head (4) is connected to the transmission shaft (5) and can be driven to rotate by the transmission shaft (5); The upper juice extraction head (3) is slidably connected to the upper cover (2), and the upper juice extraction head (3) is circumferentially fixed relative to the upper cover (2); One of the upper juicing head (3) and the lower juicing head (4) is provided with an external thread (31) and the other is provided with an internal thread (41). When the upper cover (2) is closed with the machine base (1), the external thread (31) and the internal thread (41) are screwed together. As the lower juicing head (4) rotates, the distance between the lower juicing head (4) and the upper juicing head (3) changes.

2. The juicer according to claim 1, characterized in that: A first spring (21) is connected between the upper juice extraction head (3) and the upper cover (2), and the first spring (21) causes the upper juice extraction head (3) to tend to move away from the upper cover (2).

3. The juicer according to claim 2, characterized in that: The juicer further comprises a motor (6) disposed in the base (1), the motor (6) being electrically connected to a reversing switch (61), and the motor (6) driving the transmission shaft (5) to rotate; A juice collecting tray (11) is provided on the top of the machine base (1), and the juice collecting tray (11) supports the lower juice extraction head (4) from bottom to top. The transmission shaft (5) passes through the juice collecting tray (11) and can move up and down relative to the juice collecting tray (11). The transmission shaft (5) is connected to a second spring (51), and the second spring (51) causes the transmission shaft (5) to tend to move to a high position. The lower juice extraction head (4) is provided with a transmission hole (42) extending from bottom to top along its axial direction. The transmission shaft (5) extends into the transmission hole (42) and can move up and down relative to the transmission hole (42). A detachable transmission structure is provided between the transmission hole (42) and the transmission shaft (5). The detachable transmission structure has a coupled state and a separated state. When the transmission shaft (5) is in a high position and the detachable transmission structure is in an engaged state, the transmission shaft (5) drives the lower juicer head (4) to rotate; when the lower juicer head (4) rotates in the screw-engaged direction until it can no longer rotate, as the transmission shaft (5) continues to rotate, the detachable transmission structure changes to a separated state and the transmission shaft (5) moves to a low position and presses the reversing switch (61).

4. The juicer according to claim 3, characterized in that: A mounting seat (62) is provided below the juice collecting tray (11); a second spring (51) is compressed between the mounting seat (62) and the transmission shaft (5) to cause the transmission shaft (5) to move to a high position; and a reversing switch (61) is connected to the mounting seat (62); a pressing portion (52) is provided on the transmission shaft (5); and when the transmission shaft (5) moves to a low position, the pressing portion (52) directly or indirectly presses the reversing switch (61).

5. The juicer according to claim 4, characterized in that: The elastic force of the first spring (21) is greater than the elastic force of the second spring (51).

6. The juicer according to claim 4, characterized in that: The bottom of the transmission shaft (5) is fixedly connected to a main gear (53) in the circumferential direction. The motor (6) is connected to the mounting seat (62). The mounting seat (62) is provided with a transmission gear set (63). The output shaft of the motor (6) and the main gear (53) are connected to each other by means of the transmission gear set (63). When the transmission shaft (5) moves up and down, the main gear (53) and the transmission gear set (63) remain in meshing.

7. The juicer according to claim 3, characterized in that: When the transmission shaft (5) and the transmission hole (42) are cut through the rotation plane of the transmission shaft (5), the resulting cross-sections are both circular; The detachable transmission structure comprises at least one transmission protrusion (54) arranged on the top of the transmission shaft (5) and at least one connecting transmission recess (43) arranged on the top of the transmission hole (42); the transmission protrusion (54) is provided with a first transmission vertical surface (541) and a first transmission inclined surface; and the transmission recess (43) is provided with a second transmission vertical surface and a second transmission inclined surface. When the detachable transmission structure is in the engaged state, the first transmission vertical surface (541) contacts the second transmission vertical surface, and the first transmission inclined surface contacts the second transmission vertical surface; when the lower juice extraction head (4) rotates in the direction of the screw engagement until it can no longer rotate, as the transmission shaft (5) continues to rotate, the transmission shaft (5) moves downward with the help of the transmission of the first transmission inclined surface and the second transmission inclined surface.

8. The juice extractor according to claim 7, characterized in that: The first transmission inclined surface comprises a first inclined surface section (542) located at an upper position and a second inclined surface section (543) connected to the bottom of the first inclined surface section (542); an included angle between the first inclined surface section (542) and the rotation plane of the transmission shaft (5) is 40-50 degrees, and an included angle between the second inclined surface section (543) and the rotation plane of the transmission shaft (5) is 75-85 degrees.

9. The juicer according to claim 1, characterized in that: A sliding guide structure is provided between the upper cover (2) and the upper juice extraction head (3); the upper cover (2) is provided with a through hole (22); a mounting post (32) is provided on the top of the upper juice extraction head (3); the mounting post (32) passes through the through hole (22) from bottom to top; an anti-slip screw (33) is connected to the top of the mounting post (32); a first spring (21) is sleeved on the mounting post (32) and is compressed between the upper cover (2) and the upper juice extraction head (3).

10. The juice extractor according to any one of claims 1 to 9, characterized in that: The outer periphery of the upper juice extraction head (3) is provided with a first enclosing plate (34) extending downward, and the outer side surface of the first enclosing plate (34) is provided with an external thread (31); the outer periphery of the lower juice extraction head (4) is provided with a receiving plate (44) extending outward, and the outer periphery of the receiving plate (44) is provided with a second enclosing plate (45) extending upward, and the inner side surface of the second enclosing plate (45) is provided with an internal thread (41), and the receiving plate (44) is provided with a water hole (441) penetrating the thickness direction thereof.

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