Cooking appliance

Abstract

The application provides a cooking utensil. The cooking utensil comprises a cover assembly and a pot body assembly, the pot body assembly is provided with a heating element, the cover assembly is openably and closably arranged on the pot body assembly, and the cover assembly comprises a handle, a gear set and an inner cover. The gear set is drivingly connected between the handle and the inner cover, so that the handle is rotated to drive the gear set to act, and the inner cover is rotated to realize opening or closing of the cooking utensil. The application solves the problem of easy jamming in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a cooking utensil. BACKGROUND

[0002] At present, the existing pressure cooker needs to open holes on the inner liner for the suspension and opening and closing of the inner cover, and too many holes will reduce the structural strength of the upper cover assembly, which is not conducive to the overall strength of the product. In addition, the existing electric pressure cooker relies on the cooperation between multiple rod-shaped structures to realize the opening and closing operation, which is prone to jamming.

[0003] That is, the existing cooking utensil has the problem of easy jamming when opening. SUMMARY

[0004] The main purpose of the present application is to provide a cooking utensil to solve the problem of easy jamming when opening in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a cooking utensil is provided, which comprises an upper cover assembly and a pot body assembly, the pot body assembly having a heating element, the upper cover assembly being openably and closably provided on the pot body assembly, the upper cover assembly comprising: a handle; a gear set; an inner cover, the gear set being drivingly connected between the handle and the inner cover to rotate the handle to drive the gear set to act, so as to rotate the inner cover to realize the opening or closing of the cooking utensil.

[0006] By providing the gear set on the upper cover assembly, the rotation of the inner cover is more stable, so that the cooking utensil can be stably opened or closed. The gear transmission mode makes the transmission more stable and less likely to jam, greatly increasing the stability of the cooking utensil when opening and closing. In addition, the gear set is more flat and occupies less space, which is conducive to the miniaturization of the cooking utensil.

[0007] Further, the inner cover has a connecting shaft extending upward, the upper end of the connecting shaft being hung on one gear of the gear set; or one gear of the gear set has a connecting shaft extending downward, the lower end of the connecting shaft being hung on the inner cover. The provision of the connecting shaft allows the inner cover to be directly hung on the gear set, thereby realizing the connection between the inner cover and the cover assembly. The gear set has a certain strength, which can ensure the stability of the inner cover hung on the gear set.

[0008] Further, the upper cover assembly further comprises an inner liner, the inner liner being located above the inner cover, and the gear set being located above the inner liner, wherein the upper surface of the inner liner has a sunken table, at least a part of the gear set being located in the sunken table, and the inner liner further has a mounting hole for the connecting shaft to pass through. The connecting shaft passes through the mounting hole and is connected with the driven gear to mount the driven gear on the inner liner, and at the same time connects the inner cover and the inner liner together, reducing the opening holes on the inner liner, greatly increasing the structural strength of the inner liner, and increasing the service life of the inner liner.

[0009] Further, the inner cover has a driving shaft, and the gear set is connected with the driving shaft to drive the driving shaft to rotate and realize rotation of the inner cover. In this way, when the gear set rotates, the driving shaft moves, and then the inner cover rotates to realize buckling or opening of the inner cover and the pot body assembly, so as to open or close the cooking utensil.

[0010] Further, the gear set has a driving shaft, one end of the driving shaft is connected with the inner cover to drive the inner cover to rotate. The inner cover is provided with a through hole for the driving shaft to extend into, and the driving shaft extends into the through hole to drive the inner cover to rotate. The driving shaft extends from the driven wheel to the inner cover and is integrally formed with the driven wheel.

[0011] Further, the gear set comprises: a driving wheel connected with the handle and rotating synchronously with the handle, at least a part of the driving wheel being located in the sunken table; a driven wheel engaged with the driving wheel, the driven wheel being installed in the sunken table, the inner liner further having an avoiding hole for the driving shaft to pass through, the driving shaft passing through the avoiding hole and being connected with the connecting hole of the driven wheel and being rotationally matched with the avoiding hole. The handle drives the driving wheel to rotate, and then the driving wheel drives the driven wheel engaged therewith to rotate, so as to drive the driving shaft to rotate. The driving shaft extends into the connecting hole, and at least a part of the connecting hole is in contact with the driving shaft when the driven wheel rotates, so as to drive the driving shaft to move.

[0012] Further, the driven wheel comprises: a gear structure engaged with the driving wheel; and a driving structure having a connecting hole, the gear structure and the driving structure being integrally formed. Dividing the driven wheel into two parts can make the gear structure smaller, so that other structural parts are less likely to interfere with the gear structure, the stability of rotation of the gear structure is increased, the cooking utensil is less likely to be stuck, and the stability of operation of the cooking utensil is increased.

[0013] Further, the driving structure is a plate-shaped part, the central axis of the gear structure is perpendicular to the plate-shaped part, and the outer edge of the gear structure is located within the outer edge of the plate-shaped part, and the plate-shaped part is provided with the connecting hole; or the driving structure is a plate-shaped part, the central axis of the gear structure is perpendicular to the plate-shaped part, and at least a part of the plate-shaped part extends to the outside of the outer edge of the gear structure and is provided with the connecting hole. When the driving wheel drives the gear structure to rotate, the plate-shaped part rotates synchronously to drive the driving shaft to move.

[0014] Further, the driving structure is a water-drop-shaped plate-shaped part, and the connecting hole is located at the tip of the water-drop-shaped plate-shaped part. The connecting hole is arranged at the tip, so that the distance between the connecting hole and the connecting shaft is greater than the distance from other parts of the driving structure of the water-drop-shaped plate-shaped part to the connecting shaft, so as to maximize the torque of the driving shaft and reduce the driving resistance.

[0015] Further, the support ring rib is arranged in the sink, the driven wheel is supported on the support ring rib, the mounting hole is coaxially arranged with the support ring rib, the support ring rib is arranged in interval with the avoiding hole, the avoiding hole is arranged in the sink, and the avoiding hole extends along the circumference of the support ring rib. The driven wheel is supported on the support ring rib, so that the contact area between the driven wheel and the support ring rib is reduced, the friction force on the driven wheel is reduced, and the user uses smaller force when rotating the handle.

[0016] Further, the inner liner has a mounting column, the mounting column is arranged in the sink and outside the support ring rib, the mounting column is arranged in interval with the support ring rib, and the driving wheel is mounted on the mounting column, so that at least a part of the driving wheel is overlapped on the outer area of the sink. In this way, the driving wheel and the handle are mounted together. Since the driving wheel is engaged with the gear structure, the two need to be at the same height, the driven wheel is arranged on the support ring rib, and the gear structure is further arranged on the driving structure, so that the gear structure is higher. The driving wheel is mounted on the mounting column, so as to be engaged with the gear structure. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings constituting a part of the specification of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0018] Figure 1 A structural schematic view of an upper cover assembly of an optional embodiment of the present application is shown; and

[0019] Figure 2 A structural schematic view of a driven wheel of the present application is shown. Figure 1 A schematic view of the position relationship among the gear set, the inner liner and the driving shaft is shown.

[0020] Figure 3 A structural schematic view of a driven wheel of the present application is shown. Figure 2 A schematic view of the position relationship among the driven wheel, the inner liner and the driving shaft is shown.

[0021] Figure 4 A structural schematic view of a driven wheel of the present application is shown. Figure 3 A schematic view of the position relationship among the inner liner and the driving shaft is shown.

[0022] Figure 5 A structural schematic view of a driven wheel of the present application is shown. Figure 4 A structural schematic view of an inner liner of the present application is shown.

[0023] Figure 6 A structural schematic view of an inner cover of an upper cover assembly of the present application is shown. Figure 1 A structural schematic view of an inner cover of an upper cover assembly of the present application is shown.

[0024] Figure 7 A structural schematic view of an inner cover of an upper cover assembly of the present application is shown. Figure 1 A structural schematic view of a driving wheel of the present application is shown.

[0025] Figure 8 A structural schematic view of a driving wheel of the present application is shown.Figure 1 Structure diagram of the driven wheel.

[0026] Wherein, the above-mentioned drawings include the following reference signs:

[0027] 10, handle; 20, gear set; 21, driving wheel; 211, mounting structure; 22, driven wheel; 221, connecting hole; 222, gear structure; 223, driving structure; 30, inner cover; 31, driving shaft; 32, connecting shaft; 40, inner liner; 41, sunken platform; 42, avoiding hole; 43, support ring rib; 44, mounting hole; 46, mounting column. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0030] In the present application, unless otherwise specified, the orientation words such as "upper, lower, top, bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0031] In order to solve the problem of easy jamming when opening the cover in the prior art, the present application provides a cooking appliance.

[0032] As shown in Figures 1 to 8 The cooking appliance includes a cover assembly and a pot body assembly, the cover assembly is openably and closably covered on the pot body assembly, the pot body assembly has a heating element, the cover assembly includes a handle 10, a gear set 20 and an inner cover 30, the gear set 20 is drivingly connected between the handle 10 and the inner cover 30, rotating the handle 10 drives the gear set 20 to act, so that the inner cover 30 rotates, realizing the opening or closing of the cooking appliance.

[0033] By providing the gear set 20 on the cover assembly, the rotation of the inner cover 30 is more stable, so that the cooking appliance can be stably opened or closed. The gear transmission mode makes the transmission more stable and less likely to jam, greatly increasing the stability of the opening and closing of the cooking appliance. In addition, the gear set 20 is more flattened, occupying less space height of the cover assembly, making the cover assembly more lightweight, and increasing the appearance of the whole machine.

[0034] Embodiment one

[0035] As shown in Figures 1 to 4 , and Figure 6 , the inner cover 30 has a driving shaft 31, and the gear set 20 is connected with the driving shaft 31 to drive the driving shaft 31 to rotate, so as to realize the rotation of the inner cover 30. Such arrangement makes the gear set 20 rotate to drive the driving shaft 31 to move, and then the inner cover 30 also rotates to realize the buckling or opening of the inner cover 30 and the pot body assembly, so as to open or close the cooking utensil.

[0036] As shown in Figures 1 to 4 , the gear set 20 includes a driving wheel 21 and a driven wheel 22, the driving wheel 21 is connected with the handle 10 and rotates synchronously with the handle 10; the driven wheel 22 is engaged with the driving wheel 21, and the driven wheel 22 has a connecting hole 221, the driving shaft 31 extends into the connecting hole 221 and is rotationally matched. The handle 10 drives the driving wheel 21 to rotate, and then the driving wheel 21 drives the driven wheel 22 engaged therewith to rotate, so as to drive the driving shaft 31 to rotate. The driving shaft 31 extends into the connecting hole 221, and at least part of the connecting hole 221 is in contact with the driving shaft 31 when the driven wheel 22 rotates, so that the connecting hole 221 drives the driving shaft 31 to move.

[0037] As shown in Figure 3 and Figure 8 , the driven wheel 22 includes a gear structure 222 and a driving structure 223, the gear structure 222 is engaged with the driving wheel 21, and the driving structure 223 has the connecting hole 221, and the gear structure 222 and the driving structure 223 are integrally formed. Dividing the driven wheel 22 into two parts can make the gear structure 222 more miniaturized, so that other structural members are less likely to interfere with the gear structure 222, increasing the stability of the rotation of the gear structure 222, and less likely to be stuck, increasing the stability of the operation of the cooking utensil.

[0038] Of course, the driving structure 223 can not be separately provided, and in order to drive the inner cover 30 to rotate, a connecting hole 221 needs to be provided on the gear structure 222, and the driving shaft 31 cannot affect the movement of the driven wheel 22 and the driving wheel 21, so the driving structure 223 needs to be relatively large, which is easy to interfere with the movement of other structures.

[0039] As shown in Figures 1 to 3 , the driving structure 223 is a plate-shaped member, the central axis of the gear structure 222 is perpendicular to the plate-shaped member, and the outer edge of the gear structure 222 is located within the outer edge of the plate-shaped member, and the plate-shaped member is provided with the connecting hole 221. When the driving wheel 21 drives the gear structure 222 to rotate, the plate-shaped member will rotate synchronously to drive the driving shaft 31 to move. The plate-shaped structure can be a circular structure, which is less likely to be stopped by other structures and is more stable in movement. The plate-shaped structure can also be a square structure as shown in Figure 8The water droplet-shaped structure is convenient to install with the driving shaft 31. Of course, the plate-shaped member can also be in other shapes, such as rhombus, polygon, gourd shape, flower shape, etc.

[0040] As shown in Figures 1 to 3 The driving structure 223 is a water droplet-shaped plate-shaped member, and the connecting hole 221 is located at the tip of the water droplet-shaped plate-shaped member. The distance between the tip and the connecting shaft 32 is greater than the distance from the non-tip of the water droplet-shaped plate-shaped member to the connecting shaft 32, so that the moment of the driving shaft 31 is maximized, the driving resistance can be reduced, and the rotation of the inner cover 30 is facilitated.

[0041] As shown in Figures 1 to 5 The upper cover assembly further comprises an inner liner 40 located above the inner cover 30, and the gear set 20 is arranged above the inner liner 40. The upper surface of the inner liner 40 has a sunken table 41, the driven wheel 22 is installed in the sunken table 41, at least a part of the driving wheel 21 is located in the sunken table 41, and the inner liner 40 further has a avoiding hole 42 through which the driving shaft 31 passes. The gear set 20 is installed above the inner liner 40, and the installation of the driven wheel 22 in the sunken table 41 can reduce the height space of the upper cover assembly occupied by the driven wheel 22, which is beneficial to the lightness and thinness of the upper cover assembly. The driving shaft 31 passes through the avoiding hole 42 and extends into the connecting hole 221, the connecting hole 221 drives the driving shaft 31 to rotate in the avoiding hole 42, and then the opening or closing of the cooking utensil is realized.

[0042] As shown in Figure 5 The sunken table 41 is provided with a support ring rib 43, and the driven wheel 22 is supported on the support ring rib 43. The support ring rib 43 is arranged in a spaced manner with the avoiding hole 42, the avoiding hole 42 is located in the sunken table 41, and the avoiding hole 42 extends along the circumferential direction of the support ring rib 43. The driven wheel 22 is supported on the support ring rib 43, which can reduce the contact area between the driven wheel 22 and the support ring rib 43, reduce the friction force on the driven wheel 22, so that the user uses smaller force when rotating the handle 10. The avoiding hole 42 is arranged in an arc shape, which is convenient for the driving shaft 31 to rotate in the avoiding hole 42.

[0043] As shown in Figure 5 The inner cover 30 has a connecting shaft 32 extending upward, and the upper end of the connecting shaft 32 is hung on one gear of the gear set 20. The arrangement of the connecting shaft 32 enables the inner cover 30 to be directly hung on the gear set 20, thereby realizing the connection between the inner cover 30 and the cover assembly. The gear set 20 has a certain strength, which can ensure the stability of the inner cover 30 hung on the gear set 20.

[0044] As shown in Figure 5 and Figure 6As shown, the sink 41 also has a mounting hole 44 coaxial with the support ring 43, the inner cover 30 has a connecting shaft 32 extending upward, the connecting shaft 32 passes through the mounting hole 44 and is connected with the driven wheel 22. The connecting shaft 32 passes through the mounting hole 44 and is connected with the driven wheel 22, so as to install the driven wheel 22 on the inner liner 40, and at the same time, connect the inner cover 30 and the inner liner 40 together, reduce the hole on the inner liner 40, greatly increase the structural strength of the inner liner 40, and increase the service life of the inner liner 40.

[0045] It should be noted that in the present application, since the inner cover 30 is connected to the driven wheel 22, the mounting hole 44 is located at the center of the sink 41, thereby ensuring the stable connection between the inner cover 30 and the inner liner 40, reducing the hole on the inner liner 40, increasing the structural strength of the inner liner 40, and greatly increasing the stability of the inner liner 40. In addition, reducing the hole can also leave a certain space for installing other structural members, thereby increasing the space utilization of the inner liner 40. The inner cover 30 is connected to the driven wheel 22, and the driven wheel 22 itself has a certain strength and good weight, thereby reducing the direct force applied by the connecting shaft 32 to the inner liner 40, and increasing the reliability of the connection between the connecting shaft 32 and the inner liner 40. In addition, the gear transmission can reduce the space occupied by the gear structure when driving the inner cover 30 to rotate, thereby facilitating the accommodation of other structural members, so as to install other structural members on the inner liner 40 and realize other functions.

[0046] In the present embodiment, the connecting shaft 32 is installed on the driven wheel 22 by a fastener.

[0047] As shown in the figure, Figure 5 The inner liner 40 has a mounting column 46 located in the sink 41 and outside the support ring 43, the mounting column 46 is spaced apart from the support ring 43, and the driving wheel 21 is installed on the mounting column 46, so that at least a part of the driving wheel 21 overlaps the outer region of the sink 41. This arrangement facilitates the installation of the driving wheel 21 and the handle 10 together. Since the driving wheel 21 is engaged with the gear structure 222, they need to be at the same height, and the driven wheel 22 is arranged on the support ring 43, and the gear structure 222 is also arranged on the driving structure 223, thereby making the gear structure 222 higher. The installation of the driving wheel 21 on the mounting column 46 facilitates the engagement with the gear structure 222.

[0048] In Figure 7 the specific embodiment, the driving wheel 21 has a mounting structure 211 cooperating with the mounting column 46, the mounting structure 211 is sleeved on the mounting column 46, so that the driving wheel 21 rotates more stably.

[0049] Embodiment two

[0050] The difference between the embodiment one and the embodiment two is that the driving shaft 31 is arranged on the gear set 20 instead of the inner cover 30.

[0051] The specific gear set 20 has a driving shaft 31, one end of which is connected with the inner cover 30 to drive the inner cover 30 to rotate. The inner cover 30 is provided with a through hole for the driving shaft 31 to extend into, and the driving shaft 31 extends into the through hole to drive the inner cover 30 to rotate. The driving shaft 31 extends from the driven wheel 22 to the inner cover 30 and is integrally formed with the driven wheel 22.

[0052] Embodiment three

[0053] The difference between the embodiment one and the embodiment three is the shape of the driving structure 223.

[0054] Specifically, the driving structure 223 is a plate-shaped member, the central axis of the gear structure 222 is perpendicular to the plate-shaped member, and at least a part of the plate-shaped member extends to the outside of the outer edge of the gear structure 222 and is provided with a connecting hole 221. Regardless of the shape of the plate-shaped member, it is only necessary to ensure that the plate-shaped member can be connected with the driving shaft 31. In the case of the present embodiment, in order to ensure the stability of the movement of the driven wheel 22, the plate-shaped member is preferably located above the gear structure 222, so that the lower surface of the driven wheel is relatively flat.

[0055] Embodiment four

[0056] The difference between the embodiment one and the embodiment four is the mounting form between the inner cover 30 and the gear set 20.

[0057] In the present embodiment, one gear of the gear set 20 has a connecting shaft 32 extending downward, and the lower end of the connecting shaft 32 is hung with the inner cover 30. Similar to the effect of the embodiment one, it will not be described here.

[0058] It should be noted that, in order to ensure the structural strength of the inner liner 40, the connecting shaft 32 is preferably arranged on the driven wheel 22.

[0059] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0060] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0061] It should be noted that the terms "first", "second", and the like, used in the description and in the claims of the present application as well as above-mentioned figures are used to distinguish between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of data so designated is preferably interchangeable under appropriate circumstances so that the embodiments of the application described herein are, for example, capable of use in any order mentioned or implied where this is appropriate.

[0062] The preferred embodiments of the application are described above in detail for the purposes of clarity and understanding. It should be appreciated that the application can be practiced in a variety of ways in accordance with the description provided herein, including modifications and / or alterations without departing from the spirit and scope of the application. Accordingly, the described embodiments are to be considered in all respects as illustrative and not restrictive.

Claims

1. A cooking appliance characterized by, The cooking utensil comprises a cover assembly and a pot body assembly, the pot body assembly has a heating element, the cover assembly is openably and closably arranged on the pot body assembly, and the cover assembly comprises: a handle (10); a gear set (20); an inner cover (30), the gear set (20) is drivingly connected between the handle (10) and the inner cover (30) to rotate the handle (10) to drive the gear set (20) to act, so that the inner cover (30) rotates to realize opening or closing of the cooking utensil; the inner cover (30) has a connecting shaft (32) extending upward, and an upper end of the connecting shaft (32) is hung on a gear of the gear set (20); or a gear of the gear set (20) has a connecting shaft (32) extending downward, and a lower end of the connecting shaft (32) is hung with the inner cover (30); the cover assembly further comprises an inner liner (40), the inner liner (40) is located above the inner cover (30), and the gear set (20) is arranged above the inner liner (40), wherein an upper surface of the inner liner (40) has a sunken table (41), the inner liner (40) further has a mounting hole (44) through which the connecting shaft (32) passes, and the mounting hole (44) is located at the center of the sunken table (41); the inner cover (30) has a driving shaft (31), the gear set (20) is connected with the driving shaft (31) to drive the driving shaft (31) to rotate, so that the inner cover (30) rotates; or the gear set (20) has a driving shaft (31), one end of the driving shaft (31) is connected with the inner cover (30) to drive the inner cover (30) to rotate; the gear set (20) comprises: a driving wheel (21), the driving wheel (21) is connected with the handle (10) and rotates synchronously with the handle (10), and at least a part of the driving wheel (21) is located in the sunken table (41); a driven wheel (22) engaged with the driving wheel (21), the driven wheel (22) is installed in the sunken table (41), the inner liner (40) further has an avoiding hole (42) through which the driving shaft (31) passes, the driving shaft (31) passes through the avoiding hole (42) and is connected with a connecting hole (221) of the driven wheel (22) and is rotationally matched with the avoiding hole (42), and the connecting shaft (32) passes through the mounting hole (44) and is connected with the driven wheel (22).

2. The cooking appliance of claim 1, wherein, At least a part of the gear set (20) is located in the sunken table (41).

3. The cooking appliance of claim 1, wherein, the driven wheel (22) comprises: a gear structure (222) engaged with the driving wheel (21); a driving structure (223) having the connecting hole (221), and the gear structure (222) is integrally formed with the driving structure (223).

4. The cooking utensil according to claim 3, wherein The driving structure (223) is a plate, a center axis of the gear structure (222) is perpendicular to the plate, and an outer edge of the gear structure (222) is located within an outer edge of the plate, the plate is provided with the connecting hole (221); or The driving structure (223) is a plate, a center axis of the gear structure (222) is perpendicular to the plate, and at least a part of the plate extends to an outside of an outer edge of the gear structure (222) and is provided with the connecting hole (221).

5. The cooking appliance of claim 3, wherein, The driving structure (223) is a water-drop-shaped plate, and the connecting hole (221) is located at a tip of the water-drop-shaped plate.

6. The cooking appliance of claim 1, wherein, The sunken platform (41) is provided with a support ring rib (43), the driven wheel (22) is supported on the support ring rib (43), the mounting hole (44) is coaxially arranged with the support ring rib (43), the support ring rib (43) is arranged in a spaced manner with the avoiding hole (42), the avoiding hole (42) is located in the sunken platform (41), and the avoiding hole (42) extends along a circumference of the support ring rib (43).

7. The cooking appliance of claim 6, wherein, The inner liner (40) has a mounting column (46), the mounting column (46) is located in the sunken platform (41) and located outside the support ring rib (43), the mounting column (46) is arranged in a spaced manner with the support ring rib (43), and the driving wheel (21) is mounted on the mounting column (46), so that at least a part of the driving wheel (21) is overlapped on an external area of the sunken platform (41).

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