An orange squeezer

Abstract

The utility model relates to the technical field of orange juice machine, especially an orange juice machine, which comprises a juice collecting cup, a cup opening is formed on the juice collecting cup, and a detachable juicing disc is installed in the cup opening; a juicing support is detachably connected to the lower end of the cup opening, a gear transmission box and a juicing head are arranged in the juicing support in an up-down manner, the output end of the gear transmission box is detachably connected to the juicing head, and the juicing head is arranged in an up-down corresponding manner with the juicing disc; a handheld stirring host is detachably connected to the lower end of the gear transmission box, a driving assembly is arranged in the handheld stirring host, and the output end of the driving assembly is detachably connected to the input end of the gear transmission box. In this way, the assembly is more convenient, the orange juice cannot enter the handheld stirring host during juicing, the juiced orange juice is filtered through the juicing disc and then directly falls into the juice collecting cup for collection, and the use is more convenient.

Description

Technical Field

[0001] This utility model relates to the field of orange juice maker technology, and specifically to an orange juice maker. Background Technology

[0002] An orange juicer is a device used to extract orange juice. When using it, the cut side of an orange is inserted into the central column of the juicing head, and then the orange is pressed down. During the pressing process, the juicing head is driven to rotate by the drive device on the main unit, thereby extracting juice from the orange.

[0003] For example, utility model patent CN219699596U discloses an orange juicer, including a main unit, a juice storage tray, and a juicing head. The juice storage tray is detachably connected to the upper end of the main unit. The juicing head is located inside the juice storage tray and is detachably connected to the drive end of the drive component inside the main unit. It also includes an upper cover and a pressure rod. The upper cover is detachably connected to the upper end of the juice storage tray. The middle part of the juice storage tray is provided with a channel for the lower end of the pressure rod to be vertically inserted. When the lower end of the pressure rod is inserted into the channel, the lower end of the pressure rod is used to press down on the oranges pre-placed on the juicing head so that the juicing head driven by the drive component can juice the oranges. The orange juice then flows out through the outlet located on one side of the juice storage tray. The main unit of the prior art is located at the bottom of the juice storage tray, and the juicing head and juicing tray are located inside the juice storage tray. The drive end of the drive component on the main unit needs to pass through the juice storage tray and connect to the juicing head drive, which is inconvenient to assemble. Orange juice easily enters the main unit during juicing, and the squeezed orange juice needs to flow out through the liquid outlet located on one side of the juice storage tray and then be collected through the juice collection cup, which is inconvenient to use.

[0004] Therefore, there is still room for improvement and development in existing technologies. Utility Model Content

[0005] To address the problems of existing technologies, this utility model provides an orange juicer. A handheld blender is positioned above the juicing support and gearbox, which are then positioned above the juice collection cup. The juicing disc is located inside the cup opening. The output end of the drive assembly is connected to the input end of the gearbox, and the output end of the gearbox is connected to the juicing head. This design eliminates the need to pass through the juicing disc, making assembly more convenient. Furthermore, during juicing, orange juice cannot enter the handheld blender; the extracted juice is filtered through the juicing disc and falls directly into the juice collection cup for collection, making it more convenient to use.

[0006] To achieve the above objectives, the technical solution applied in this utility model is as follows: An orange juicer includes a juice collection cup with a formed mouth and a detachable juicing disc installed inside the mouth; a juicing support, the lower end of which is detachably connected to the mouth; a gearbox and a juicing head arranged vertically within the support; the output end of the gearbox is detachably connected to the juicing head; and the juicing head and juicing disc are vertically aligned. A handheld blender is also included, the lower end of which is detachably connected to the gearbox; a drive assembly is located within the blender, the output end of which is detachably connected to the input end of the gearbox. This configuration places the handheld blender above the juicing support and gearbox, which are also positioned above the juice collection cup. The juicing disc is located inside the mouth, and the output end of the drive assembly connects to the input end of the gearbox, which in turn connects to the juicing head. This eliminates the need for the blender to pass through the juicing disc, making assembly easier. Furthermore, orange juice cannot enter the handheld blender during juicing; the juice is filtered by the juicing disc and falls directly into the collection cup for collection, making it more convenient to use.

[0007] According to the above scheme, a polygonal locking platform is formed on the inner wall of the cup mouth, and a polygonal locking protrusion is formed on the outer edge of the juicing plate, which engages with the polygonal locking platform; a conical arc-shaped column is formed at the center of the juicing plate, and multiple filter grooves are provided through the juicing plate; a conical arc-shaped inner cavity is formed inside the juicing head, and the conical arc-shaped inner cavity is coaxially arranged with the conical arc-shaped column, and multiple rows of vertically arranged spikes are evenly distributed on the inner wall of the conical arc-shaped inner cavity. With this design, the juicing disc is axially fixed and will not rotate after assembly, thanks to the cooperation of the polygonal convex plate and the polygonal plate. This allows for better juicing when combined with the rotating juicing head. A conical arc-shaped column is positioned at the center of the juicing disc to hold a half-cut orange. The conical arc-shaped inner cavity fits the surface of half an orange, and multiple rows of serrated edges on the inner wall of this cavity further secure the top of the orange. During juicing, the juicing head can rotate the orange relative to the conical arc-shaped column, resulting in even better juicing.

[0008] According to the above scheme, the multiple rows of spikes are vertically arranged from the center of the conical arc-shaped inner cavity to the outer edge of the inner cavity, and the angle formed by the center line of two adjacent rows of spikes and the center line of the conical arc-shaped inner cavity is 22.5°. This arrangement allows the multiple rows of spikes to have a wider contact area with the orange peel, resulting in a more reliable fixing effect and more stable downward pressure on the orange by the juicing head during the juicing process.

[0009] According to the above scheme, each row of teeth consists of multiple teeth evenly spaced apart; the upper end of each tooth is square, and the lower end is pointed, with the square structure fixed to the inner wall of the conical arc-shaped cavity. This design, with the lower end of the teeth being pointed, allows the pointed structure to easily penetrate the orange peel and achieve a gripping effect when the juicer head is pressed down; the square upper end of the teeth, fixed to the inner wall of the conical arc-shaped cavity, makes the teeth more stable.

[0010] According to the above scheme, the gearbox includes a housing, an input shaft, a gear assembly, and an output shaft. The housing slides within the juicing bracket, the gear assembly is fixed within the housing, the upper end of the input shaft is detachably connected to the output end of the drive assembly, the lower end of the input shaft extends into the housing and is driven by the input end of the gear assembly, the output end of the gear assembly is driven by the upper end of the output shaft, and the lower end of the output shaft extends out of the housing and is detachably connected to the juicing head. The gear assembly includes an upper cover, an internal gear, and a planetary gear set. The upper cover and the internal gear are fixedly connected, the planetary gear set is located inside the internal gear and meshes with the internal gear, and a central gear is fixed to the lower end of the input shaft. Gear 1 is driven by the input end of the planetary gear set, and the output end of the planetary gear set is driven by the upper end of the output shaft. The planetary gear set includes planetary gear 1, planetary gear carrier 1, planetary gear 2, and planetary gear carrier 2. Planetary gear 1 is mounted on planetary gear carrier 1, and central gear 1 meshes with planetary gear 1. Central gear 2 is located at the lower end of the planetary gear carrier, and planetary gear 2 is mounted on planetary gear carrier 2, meshing with planetary gear 2. An output connector is located at the lower end of planetary gear carrier 2, and the output connector is driven by the upper end of the output shaft. Both planetary gear 1 and planetary gear 2 mesh with internal gears. This configuration results in a compact gearbox structure and small size. When the drive component in the handheld blender outputs, it passes through the gearbox to obtain the low-speed output mode required for juicing, resulting in better juicing performance compared to the high-speed output mode.

[0011] According to the above scheme, an oil-impregnated bearing and an oil seal are provided between the output shaft and the housing, with the oil seal located below the oil-impregnated bearing. This arrangement improves the rotation efficiency of the output shaft and prevents oil from flowing out of the housing under the action of the oil seal.

[0012] According to the above scheme, the housing includes a main body and a base, which are fixedly connected by a locking mechanism. A limiting step one is formed on the outer edge of the base, and a limiting step two is formed on the inner wall of the juicing bracket. A return spring is fitted onto the outer wall of the base, with its two ends abutting against limiting step one and limiting step two, respectively. With this configuration, during juicing, the handheld blender drives the gearbox to cyclically rise and fall, while simultaneously driving the input shaft, gear assembly, output shaft, and juicing head to rotate. During the descent of the gearbox, the return spring is in a compressed state; during the ascent, the return spring pushes the gearbox upward, thereby achieving a cyclical rising and falling rotation of the juicing head relative to the juicing disc, resulting in better juicing performance.

[0013] According to the above scheme, the lower end of the juicing support has a polygonal protrusion that engages with a polygonal locking platform; the lower end of the handheld blender has a buckle, and the upper end of the gearbox has a groove, with the buckle engaging with the groove. With this configuration, the juicing support is axially fixed and will not rotate after assembly, thanks to the engagement of the polygonal protrusion and the polygonal locking platform; the buckle and groove engage to allow the handheld blender to drive the gearbox to cyclically rise and fall relative to the juicing support.

[0014] The beneficial effects of this utility model are: This invention features a handheld blender mounted on top of the juicing support and gearbox, which in turn are positioned on top of the juice collection cup. The juicing disc is located inside the cup opening. The output end of the drive assembly is connected to the input end of the gearbox, and the output end of the gearbox is connected to the juicing head. This design eliminates the need to pass through the juicing disc, making assembly more convenient. Furthermore, during juicing, orange juice cannot enter the handheld blender; the extracted orange juice is filtered through the juicing disc and falls directly into the juice collection cup for collection, making it more convenient to use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is an exploded view of the overall structure of this utility model; Figure 3 This is an assembly cross-sectional view of the juicing support, gearbox, and juice collection cup of this utility model; Figure 4 This is a cross-sectional view of the juicing bracket and gearbox assembly of this utility model; Figure 5 This is a sectional view of the gearbox of this utility model; Figure 6 This is a sectional view of the gear assembly of this utility model; Figure 7 This is a schematic diagram of the juicing head of this utility model; Figure 8 This is a cross-sectional view of the juicing head of this utility model; Figure 9 This is a cross-sectional view of the juicing head and orange assembly of this utility model; Figure 10 This is a bottom view of the juicing head and orange assembly of this utility model.

[0016] In the picture: 1. Handheld blender main unit; 11. Buckle; 2. Juicing support; 21. Polygonal locking protrusion one; 3. Juice collection cup; 31. Cup mouth; 32. Polygonal locking platform; 4. Gearbox; 41. Input shaft; 411. Central gear one; 42. Gear assembly; 421. Top cover; 422. Internal gear; 423. Planetary gear one; 424. Planetary gear carrier one; 425. Central gear two; 426. Planetary gear two; 427. Planetary gear carrier two; 42 8. Output connector; 43. Output shaft; 44. Oil-impregnated bearing; 45. Main body; 451. Slot 1; 452. Snap 2; 46. Base; 461. Slot 2; 47. Return spring; 48. Limiting step 1; 49. Limiting step 2; 410. Sealing ring; 5. Juicing head; 50. Conical arc-shaped inner cavity; 51. Nail teeth; 6. Juicing disc; 61. Conical arc-shaped column; 62. Filter groove hole; 63. Polygonal snap protrusion 2; 20. Orange. Detailed Implementation

[0017] The technical solution of this utility model will be described below with reference to the accompanying drawings and embodiments.

[0018] like Figures 1 to 10 As shown, the present invention provides an orange juicer, comprising a juice collection cup 3 with a cup mouth 31 formed thereon, and a detachable juicing disc 6 installed inside the cup mouth 31; a juicing support 2, the lower end of which is detachably connected to the cup mouth, and a gearbox 4 and a juicing head 5 arranged vertically inside the juicing support 2, the output end of which is detachably connected to the juicing head 5, and the juicing head 5 and the juicing disc 6 being arranged vertically correspondingly; and a handheld blender 1, the lower end of which is detachably connected to the gearbox 4, and a drive assembly inside the handheld blender 1, the output end of which is detachably connected to the input end of the gearbox 4. With this configuration, the handheld blender 1 is positioned above the juicing support 2 and the gearbox 4. The juicing support 2 and the gearbox 4 are positioned above the juice collection cup 3. The juicing disc 6 is positioned inside the cup opening 31. The output end of the drive assembly is connected to the input end of the gearbox 4, and the output end of the gearbox 4 is connected to the juicing head 5. It does not need to pass through the juicing disc 6, making assembly more convenient. During juicing, orange juice cannot enter the handheld blender 1. The extracted orange juice is filtered through the juicing disc 6 and falls directly into the juice collection cup 3 for collection, making it more convenient to use.

[0019] The handheld blender 1 is an independent structure that can be disassembled and used in conjunction with other blending components, such as blending juice, beating egg whites, mashing potatoes, and blending meat to achieve more functions. The juicing plate 6 and the juicing head 5 are both detachable for easy cleaning.

[0020] Furthermore, a polygonal locking platform 32 is formed on the inner wall of the cup opening 31, and a polygonal locking protrusion 63 is formed on the outer edge of the juicing disc 6. The polygonal locking protrusion 63 and the polygonal locking platform 32 are engaged in a locking fit. A conical arc-shaped column 61 is formed at the center of the juicing disc 6, and multiple filter grooves 62 are provided through the juicing disc 6. A conical arc-shaped inner cavity 50 is formed inside the juicing head 5. The conical arc-shaped inner cavity 50 and the conical arc-shaped column 61 are coaxially arranged, and multiple rows of vertically arranged spikes 51 are evenly distributed on the inner wall of the conical arc-shaped inner cavity 50. With this configuration, the juicing disc 6 is axially fixed and will not rotate after assembly, thanks to the engagement of the polygonal protrusion 63 and the polygonal platform 32. This design also improves the juicing effect when combined with the rotating juicing head 5. A conical arc-shaped column 61 is positioned at the center of the juicing disc 6 to hold a half-cut orange 20. The conical arc-shaped inner cavity 50 fits the surface of half an orange 20, and multiple rows of teeth 51 are provided on the inner wall of the conical arc-shaped inner cavity 50, further securing the top of the orange 20. During juicing, the juicing head 5 can rotate the orange 20 relative to the conical arc-shaped column 61, resulting in a better juicing effect.

[0021] Furthermore, the multiple rows of spikes 51 are vertically arranged from the center of the conical arc-shaped inner cavity 50 to its outer edge, with the angle between the centerline of two adjacent rows of spikes 51 and the centerline of the conical arc-shaped inner cavity 50 being 22.5°. This arrangement allows the multiple rows of spikes 51 to have a wider contact area with the orange peel 20, resulting in a more reliable fixing effect. During the juicing process, the juicing head 5 can more stably press the orange 20 downwards.

[0022] Furthermore, each row of the spikes 51 is composed of multiple spikes 51 evenly spaced apart; the upper end of each spike 51 has a square structure, and the lower end has a pointed structure, with the square structure fixed to the inner wall of the conical arc-shaped inner cavity 50. This design allows the pointed lower end of the spikes 51 to easily penetrate the orange peel 20 and achieve a gripping effect when the juicer head 5 is pressed down; the square upper end of the spikes 51, fixed to the inner wall of the conical arc-shaped inner cavity 50, makes the spikes 51 more stable.

[0023] Among them, the engagement between the spike 51 and the peel of the orange 20 will become loose as the juicing time increases. From a mechanical point of view, the sharp-angled structure has greater friction with the peel of the orange 20 than the round structure, and the engagement force is more stable and lasting.

[0024] Furthermore, the gearbox 4 includes a housing, an input shaft 41, a gear assembly 42, and an output shaft 43. The housing slides within the juicing bracket 2. The gear assembly 42 is fixed within the housing. The upper end of the input shaft 41 is detachably connected to the output end of the drive assembly. The lower end of the input shaft 41 extends into the housing and is driven by the input end of the gear assembly 42. The output end of the gear assembly 42 is driven by the upper end of the output shaft 43. The lower end of the output shaft 43 extends out of the housing and is detachably connected to the juicing head 5. The gear assembly 42 includes an upper cover 421, an internal gear 422, and a planetary gear set. The upper cover 421 and the internal gear 422 are fixedly connected. The planetary gear set is located within the internal gear 422 and meshes with it. A central gear 411 is fixed to the lower end of the input shaft 41. The central gear 411 meshes with the planetary gear set. The input end of the gear set is connected to the drive, and the output end of the planetary gear set is connected to the upper end of the output shaft 43. The planetary gear set includes a first planetary gear 423, a first planetary gear carrier 424, a second planetary gear 426, and a second planetary gear carrier 427. The first planetary gear 423 is mounted on the first planetary gear carrier 424, and the first central gear 411 meshes with the first planetary gear 423. The lower end of the first planetary gear carrier 424 is provided with a second central gear 425, and the second planetary gear 426 is mounted on the second planetary gear carrier 427. The second central gear 425 meshes with the second planetary gear 426. The lower end of the second planetary gear carrier 427 is provided with an output connector 428, which is connected to the upper end of the output shaft 43. Both the first planetary gear 423 and the second planetary gear 426 mesh with the internal gear 422. With this configuration, the gearbox 4 is compact and small in size. When the drive component inside the handheld blender 1 outputs, it can obtain the low-speed output mode required for juicing after passing through the gearbox 4. Compared with the high-speed output mode, the juicing effect is better.

[0025] Specifically, during operation, the drive assembly drives the input shaft 41 to rotate the central gear 411, which in turn drives the planetary gear 423 to rotate. The planetary gear 423 then drives the planetary gear carrier 424 to rotate. The central gear 425 on the planetary gear carrier 424 drives the planetary gear 426 to rotate. The output connector 428 of the planetary gear carrier 427 drives the juicing head 5 to achieve the low-speed rotation required for operation. The preferred rotation speed is 250 to 450 rpm.

[0026] Furthermore, an oil-impregnated bearing 44 and an oil seal 410 are provided between the output shaft 43 and the housing, with the oil seal 410 located below the oil-impregnated bearing 44. This arrangement improves the rotation efficiency of the output shaft 43 and prevents oil from flowing out of the housing under the action of the oil seal 410.

[0027] Furthermore, the housing includes a main body 45 and a base 46, which are fixedly connected. A limiting step 48 is formed on the outer edge of the base 46, and a limiting step 49 is formed on the inner wall of the juicing bracket 2. A return spring 47 is sleeved on the outer wall of the base 46, with its two ends abutting against the limiting step 48 and the limiting step 49, respectively. With this configuration, during juicing, the handheld blender 1 drives the gearbox 4 to cyclically rise and fall, while the drive assembly drives the input shaft 41, gear assembly 42, output shaft 43, and juicing head 5 to rotate. During the descent of the gearbox 4, the return spring 47 is in a compressed state; during the ascent, the return spring 47 pushes the gearbox 4 upward, thereby realizing the cyclical rising and falling rotation of the juicing head 5 relative to the juicing disc 6, resulting in better juicing effect.

[0028] The outer wall of the main body 45 is provided with a second buckle 452, and the inner wall of the base 46 is provided with a second slot 461. The second buckle 452 and the second slot 461 are matched and easy to assemble.

[0029] Furthermore, the lower end of the juicing support 2 is formed with a polygonal protrusion 21, which engages with a polygonal locking platform 32; the lower end of the handheld blender 1 is formed with a buckle 11, and the upper end of the gearbox 4 is formed with a locking groove 451, which engages with the buckle 11. With this configuration, the juicing support 2 is axially fixed and will not rotate after assembly, thanks to the engagement of the polygonal protrusion 21 and the locking platform 32; and the engagement of the buckle 11 and the locking groove 451 allows the handheld blender 1 to drive the gearbox 4 to cyclically rise and fall relative to the juicing support 2.

[0030] The embodiments of the present utility model have been described above with reference to the accompanying drawings. However, the present utility model is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present utility model without departing from the spirit and scope of the claims, and all of these forms are within the scope of protection of the present utility model.

Claims

1. An orange juice maker, characterized in that, include: Juice collection cup (3), the juice collection cup (3) has a cup mouth (31) formed on it, and a detachable juicing plate (6) is installed inside the cup mouth (31). Juicing support (2), the lower end of the juicing support (2) is detachably connected to the cup mouth (31), the juicing support (2) is provided with a gear gearbox (4) and a juicing head (5) arranged vertically inside the juicing support (2), the output end of the gear gearbox (4) is detachably connected to the juicing head (5), and the juicing head (5) and the juicing plate (6) are arranged vertically in correspondence; A handheld mixer (1) is provided with a drive assembly inside the handheld mixer (1) and the output end of the drive assembly is detachably connected to the input end of the gearbox (4).

2. The orange juice maker according to claim 1, characterized in that: A polygonal locking platform (32) is formed on the inner wall of the cup mouth (31), and a polygonal locking protrusion (63) is formed on the outer edge of the juicing plate (6). The polygonal locking protrusion (63) and the polygonal locking platform (32) are engaged in a locking fit. A conical arc-shaped column (61) is formed at the center of the juicing plate (6), and multiple filter grooves (62) are provided through the juicing plate (6). A conical arc-shaped inner cavity (50) is formed inside the juicing head (5). The conical arc-shaped inner cavity (50) and the conical arc-shaped column (61) are coaxially arranged. Multiple rows of vertically arranged spikes (51) are evenly distributed on the inner wall of the conical arc-shaped inner cavity (50).

3. The orange juice maker according to claim 2, characterized in that: The multiple rows of nail teeth (51) are vertically arranged from the center of the conical arc-shaped inner cavity (50) to the outer edge of the conical arc-shaped inner cavity (50), and the angle formed by the center line of two adjacent rows of nail teeth (51) and the center line of the conical arc-shaped inner cavity (50) is 22.5°.

4. An orange juice maker according to claim 2, characterized in that: Each row of the nail teeth (51) is composed of multiple nail teeth (51) evenly spaced; the upper end of the nail teeth (51) is a square structure, and the lower end of the nail teeth (51) is a pointed structure. The square structure is fixed on the inner wall of the conical arc-shaped inner cavity (50).

5. An orange juice maker according to claim 2, characterized in that: The gearbox (4) includes a housing, an input shaft (41), a gear assembly (42), and an output shaft (43). The housing is slidably located inside the juicing bracket (2). The gear assembly (42) is fixed inside the housing. The upper end of the input shaft (41) is detachably connected to the output end of the drive assembly. The lower end of the input shaft (41) extends into the housing and is connected to the input end of the gear assembly (42). The output end of the gear assembly (42) is connected to the upper end of the output shaft (43). The lower end of the output shaft (43) extends out of the housing and is detachably connected to the juicing head (5).

6. An orange juice maker according to claim 5, characterized in that: The gear assembly (42) includes an upper cover (421), an internal gear (422), and a planetary gear set. The upper cover (421) and the internal gear (422) are fixedly connected. The planetary gear set is located inside the internal gear (422) and meshes with the internal gear (422). A central gear (411) is fixed at the lower end of the input shaft (41). The central gear (411) is drivenly connected to the input end of the planetary gear set. The output end of the planetary gear set is drivenly connected to the upper end of the output shaft (43).

7. An orange juice maker according to claim 6, characterized in that: The planetary gear set includes a first planetary gear (423), a first planetary gear carrier (424), a second planetary gear (426), and a second planetary gear carrier (427). The first planetary gear (423) is mounted on the first planetary gear carrier (424). The first central gear (411) and the first planetary gear (423) are meshed together. The second central gear (425) is provided at the lower end of the first planetary gear carrier (424). The second planetary gear (426) is mounted on the second planetary gear carrier (427). The second central gear (425) and the second planetary gear (426) are meshed together. The lower end of the second planetary gear carrier (427) is provided with an output connector (428). The output connector (428) and the upper end of the output shaft (43) are connected in a transmission manner. The first planetary gear (423) and the second planetary gear (426) are both meshed together with the internal gear (422).

8. An orange juice maker according to claim 5, characterized in that: An oil-impregnated bearing (44) and an oil seal (410) are provided between the output shaft (43) and the housing, with the oil seal (410) located below the oil-impregnated bearing (44).

9. An orange juice maker according to claim 5, characterized in that: The housing includes a main body (45) and a base (46), which are fixedly connected by a locking mechanism. A first limiting step (48) is formed on the outer edge of the base (46), and a second limiting step (49) is formed on the inner wall of the juicing bracket (2). A return spring (47) is sleeved on the outer wall of the base (46), and the two ends of the return spring (47) abut against the first limiting step (48) and the second limiting step (49) respectively.

10. An orange juice maker according to claim 2, characterized in that: The lower end of the juicing support (2) is formed with a polygonal protrusion (21), which engages with the polygonal plate (32); the lower end of the handheld mixer (1) is formed with a buckle (11), and the upper end of the gearbox (4) is formed with a groove (451), which engages with the buckle (11) and the groove (451).

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