Ventilation cover and cooking box

Abstract

The ventilation cover comprises a cover body and a first adjusting assembly, a first ventilation hole is formed in the cover body, the first adjusting assembly comprises a first shielding piece, a first driving piece and a first linear driver, the first shielding piece is arranged on the inner wall of the cover body in a sliding mode, and the first driving piece is arranged on the inner wall of the cover body in a sliding mode. The cover body is provided with a first ventilation hole, the first ventilation hole is formed in the cover body and is used for avoiding or shielding the first ventilation hole, the first shielding part is provided with a first transmission surface, the first driving part is arranged on the first transmission surface in a sliding manner, and the first linear driver is mounted on the cover body and is obliquely arranged relative to the first transmission surface so as to be used for extruding the first driving part.

Description

TECHNICAL FIELD

[0001] The utility model relates to cooking box ventilation technical field, in particular to a ventilation cover and cooking box. BACKGROUND

[0002] The cooking box includes a box body, a ventilation cover, a heating pipe and a fan. The heating pipe serves as a heat source, and the fan serves as a wind source. The ventilation cover is installed on the box body. The ventilation cover is provided with a ventilation hole. The ventilation cover controls the hot air circulation in the box body through the ventilation hole. Correspondingly, the hot air circulation efficiency is largely dependent on the size of the ventilation hole. Since the size of the ventilation hole in the existing ventilation cover is fixed and cannot be adjusted, the hot air circulation efficiency cannot be adjusted, which cannot meet the actual use requirements of the cooking box. SUMMARY

[0003] Therefore, it is necessary to provide a ventilation cover and a cooking box to solve the problem of insufficient adjustability of the hot air circulation efficiency in the cooking box.

[0004] A ventilation cover includes a cover body and a first adjusting assembly. The cover body is provided with a first ventilation hole. The first adjusting assembly includes a first shielding piece, a first driving piece and a first linear driver. The first shielding piece is slidingly arranged on the inner wall of the cover body to avoid or shield the first ventilation hole. The first shielding piece is provided with a first transmission surface. The first driving piece is slidingly arranged on the first transmission surface. The first linear driver is installed on the cover body and is inclined relative to the first transmission surface to press the first driving piece.

[0005] The first adjusting assembly further includes a first elastic piece. One end of the first elastic piece is fixed to the inner wall of the cover body. The other end of the first elastic piece abuts against the first driving piece. The output end of the first linear driver is pressed on the first driving piece. In the axial direction of the first linear driver, the first elastic piece and the first linear driver are respectively located on the two sides of the first driving piece.

[0006] The first ventilation hole extends along a first direction. The first shielding piece is provided with a third guide groove extending along the first direction. The third guide groove is inclined relative to the first transmission surface. A second stop pin is fixedly arranged on the cover body. The second stop pin is inserted into the third guide groove. The end of the second stop pin presses the first shielding piece on the cover body.

[0007] The first transmission surface is provided with a first sliding groove. The first driving piece is provided with a first sliding bar. The first sliding bar is slidingly arranged in the first sliding groove to position the first driving piece on the first shielding piece in the normal direction of the first transmission surface.

[0008] The ventilation cover further comprises a rotating assembly and a second adjusting assembly, and a second ventilation hole is formed in the cover body;

[0009] The rotating assembly comprises a rotating shaft and a first transmission rod, the first transmission rod is fixed to the outer wall of the rotating shaft and extends radially along the rotating shaft, and the second adjusting assembly comprises a second shielding piece, a second driving piece and a second linear driver.

[0010] The rotating shaft is rotationally arranged on the cover body, the second shielding piece is positioned on the cover body along the axial direction of the rotating shaft, a spiral transmission groove is formed in the second driving piece, the spiral transmission groove is coaxially arranged with the rotating shaft, and the first transmission rod is inserted into the spiral transmission groove, so that the second shielding piece can avoid or shield the second ventilation hole by rotating around the axis of the rotating shaft.

[0011] A second transmission surface is arranged on the second driving piece, the second transmission surface is arranged obliquely relative to the rotating shaft, the second shielding piece is slidingly arranged on the second transmission surface, and the second linear driver is mounted on the cover body to press the second driving piece.

[0012] The second adjusting assembly further comprises a second elastic piece, one end of the second elastic piece is fixed to the second driving piece, the other end of the second elastic piece abuts against the cover body, and the second linear driver and the second elastic piece are respectively located on the two sides of the second driving piece in the axial direction of the second linear driver.

[0013] The rotating assembly further comprises a rotating driver, the rotating driver is mounted on the cover body to control the rotation of the rotating shaft, and the second linear driver and the rotating driver are electrically connected.

[0014] A first guide groove and a second guide groove are formed in the second shielding piece, the first guide groove extends radially along the rotating shaft, the second guide groove extends circumferentially along the rotating shaft, the first guide groove and the second guide groove are communicated, the cover body is fixedly provided with a first stop pin, the first stop pin is inserted into the first guide groove or the second guide groove, and the end portion of the first stop pin presses the second shielding piece on the cover body along the axial direction of the rotating shaft.

[0015] A second sliding groove is arranged on the second shielding piece, a second sliding strip is arranged on the second driving piece, the second sliding strip is slidingly arranged in the second sliding groove, so that the second shielding piece is positioned on the second driving piece in the normal direction of the second transmission surface.

[0016] A cooking box, comprising a box body and a ventilation cover, the ventilation cover is installed on the box body, and the first ventilation hole is located in the box body.

[0017] The utility model discloses the beneficial effects of:

[0018] The first linear driver is arranged obliquely relative to the first transmission surface, and the first linear driver can generate a pressure along the normal direction of the first transmission surface on the first shielding piece through the first driving piece, which makes the first shielding piece and the inner wall of the cover body adhere to each other, and then the first shielding piece also slides on the inner wall of the cover body during the relative sliding of the first shielding piece and the first driving piece, thereby gradually shielding the first ventilation hole and achieving the purpose of reducing the ventilation area of the first ventilation hole.

[0019] Conversely, when the pressure of the first linear driver on the first driving piece decreases and the first driving piece starts to move away from the inner wall of the cover body, the first shielding piece starts to reset, so that the ventilation area of the first ventilation hole increases again.

[0020] The above-mentioned ventilation area adjusting mode has low requirements for the installation direction accuracy of the first linear driver, and the ventilation cover also has the function of adjustable ventilation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a front view structural schematic diagram of the ventilation cover in the utility model embodiment;

[0022] Figure 2 It is a three-dimensional structural schematic diagram of the ventilation cover in the utility model embodiment;

[0023] Figure 3 It is Figure 2 An enlarged structural schematic diagram of position A in the middle;

[0024] Figure 4 It is a three-dimensional structural schematic diagram of the first adjusting assembly in the utility model embodiment;

[0025] Figure 5 It is an exploded structural schematic diagram of the first adjusting assembly in the utility model embodiment;

[0026] Figure 6 It is Figure 2 An enlarged structural schematic diagram of position B;

[0027] Figure 7 It is a three-dimensional structural schematic diagram of the second adjusting assembly in the utility model embodiment Figure 1 ;

[0028] Figure 8 It is a three-dimensional structural schematic diagram of the second adjusting assembly in the utility model embodiment Figure 2 ;

[0029] Figure 9 It is the explosion structure schematic view of the second adjusting assembly in the embodiment of the utility model;

[0030] Figure 10 It is the three-dimensional structure schematic view of the rotating assembly in the embodiment of the utility model;

[0031] Figure 11 It is the three-dimensional structure schematic view of the assembly relation of the rotating assembly and the second adjusting assembly in the embodiment of the utility model.

[0032] Reference signs:

[0033] 1, cover body; 11, first air exchange hole; 12, second air exchange hole; 13, first stop pin; 14, second stop pin; 2, first adjusting assembly; 21, first shielding piece; 211, first transmission surface; 212, third guide groove; 213, first sliding groove; 22, first driving piece; 221, first sliding bar; 23, first linear driver; 24, first elastic piece; 3, rotating assembly; 31, rotating shaft; 32, first transmission rod; 33, rotating driver; 4, second adjusting assembly; 41, second shielding piece; 411, first guide groove; 412, second guide groove; 413, second sliding groove; 42, second driving piece; 421, helical transmission groove; 422, second transmission surface; 423, second sliding bar; 43, second linear driver; 44, second elastic piece. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purpose, features and advantages of the utility model more apparent, obvious and easy to understand, the specific implementation of the utility model is described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0035] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0036] In addition, the terms "first", "second", "third", etc. are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or an ordered sequence. Thus, features defined with "first", "second" or "third" can include, explicitly or implicitly, at least one of such features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0037] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0039] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only embodiment.

[0040] Embodiment:

[0041] Referring to Figure 1 and Figure 2The embodiment provides a ventilation cover, which comprises a cover body 1, a first adjusting assembly 2 and a second adjusting assembly 4, the cover body 1 is provided with a first ventilation hole 11 and a second ventilation hole 12, the first adjusting assembly 2 is installed at the first ventilation hole 11 to control the opening size of the first ventilation hole 11, and the second adjusting assembly 4 is installed at the second ventilation hole 12 to control the opening size of the second ventilation hole 12. The opening size of the first ventilation hole 11 and the second ventilation hole 12 is controlled, so that the gas flow rate is changed.

[0042] Referring to Figures 3-5 The first adjusting assembly 2 comprises a first shielding piece 21, a first driving piece 22 and a first linear driver 23. The first shielding piece 21 and the first driving piece 22 are wedge-shaped blocks, and the first shielding piece 21 is provided with a first transmission surface 211, and the first driving piece 22 is attached to the first transmission surface 211 and can slide on the first transmission surface 211. The first linear driver 23 is installed on the cover body 1 to press the first driving piece 22, so that the first driving piece 22 gradually approaches the inner wall of the cover body 1, and in this process, the first shielding piece 21 and the first driving piece 22 also slide relative to each other.

[0043] It is particularly worth noting that, since the first linear driver 23 is arranged obliquely relative to the first transmission surface 211, the force of the first linear driver 23 on the first driving piece 22 causes the first driving piece 22 to generate a pressure on the first shielding piece 21 along the normal direction of the first transmission surface 211, which causes the first shielding piece 21 to be attached to the inner wall of the cover body 1, and then in the process of the relative sliding of the first shielding piece 21 and the first driving piece 22, the first shielding piece 21 also slides on the inner wall of the cover body 1 along the first direction. Since the first ventilation hole 11 extends along the first direction, the first shielding piece 21 can gradually shield the first ventilation hole 11 in the process of sliding along the first direction, so as to reduce the ventilation area of the first ventilation hole 11. Conversely, when the pressure of the first linear driver 23 on the first driving piece 22 decreases, and the first driving piece 22 begins to move away from the inner wall of the cover body 1, the first shielding piece 21 can retreat along the first direction under the action of gravity, so that the ventilation area of the first ventilation hole 11 increases again, until the first shielding piece 21 can completely avoid the first ventilation hole 11.

[0044] It is not difficult to understand that, as long as the first linear driver 23 is not parallel to the first transmission surface 211, the movement of the first driving piece 22 in the axial direction of the first linear driver 23 can effectively control the shielding or avoidance of the first shielding piece 21 to the first ventilation hole 11, so as to adjust the ventilation area of the first ventilation hole 11. Therefore, in the embodiment, the assembly angle of the first linear driver 23 has a larger optional range.

[0045] In some embodiments, the output end of the first linear driver 23 can be fixed on the first driving member 22. In the present embodiment, the output end of the first linear driver 23 is merely pressed on the first driving member 22, instead of being fixed. In order to prevent the output end of the first linear driver 23 and the first driving member 22 from being separated, causing the first driving member 22 to fall, the first adjusting assembly 2 further comprises a first elastic member 24, one end of the first elastic member 24 is fixed on the inner wall of the cover 1, and the other end of the first elastic member 24 abuts on the first driving member 22. In the axial direction of the first linear driver 23, the first elastic member 24 and the first linear driver 23 are respectively located on the two sides of the first driving member 22, and the first driving member 22 is pressed on the output end of the first linear driver 23 by the first elastic member 24.

[0046] Preferably, the first shielding member 21 is provided with a third guide groove 212 extending in the first direction, so that the third guide groove 212 is also inclined relative to the first transmission surface 211. The cover 1 is fixedly provided with a second stop pin 14, which is inserted in the third guide groove 212 to guide the sliding of the first shielding member 21 on the cover 1, and also limit the movement stroke of the first shielding member 21 in the first direction. In addition, the end of the second stop pin 14 is located outside the third guide groove 212 to press the first shielding member 21 on the cover 1. In this way, it is ensured that the first shielding member 21 can always be attached to the inner wall of the cover 1 when sliding in the first direction on the cover 1, thereby effectively adjusting the ventilation area of the first ventilation hole 11.

[0047] In the present embodiment, in order to prevent the first driving member 22 and the first shielding member 21 from being separated, the first transmission surface 211 is provided with a first sliding groove 213, and the first driving member 22 is provided with a first sliding strip 221, which is slidingly arranged in the first sliding groove 213, so that the first driving member 22 is positioned on the first shielding member 21 in the normal direction of the first transmission surface 211. Therefore, without considering the gravity, the advancement or retreat of the first shielding member 21 in the first direction can be controlled only by the movement of the first driving member 22 in the axial direction of the first linear driver 23.

[0048] Referring to Figures 6-9 , the second adjusting assembly 4 comprises a second shielding member 41, a second driving member 42, a second linear driver 43 and a second elastic member 44.

[0049] Similar to the first adjusting assembly 2, the second driving member 42 is a wedge-shaped block, and a second transmission surface 422 is arranged on the second driving member 42. The second shielding member 41 is slidingly arranged on the second transmission surface 422, and a second sliding groove 413 is arranged on the second shielding member 41. A second sliding strip 423 is arranged on the second driving member 42 and slidingly arranged in the second sliding groove 413, so that the second shielding member 41 is positioned on the second driving member 42 in the normal direction of the second transmission surface 422, and the second shielding member 41 is always attached to the second transmission surface 422. The second linear driver 43 is installed on the cover body 1 and is arranged obliquely relative to the second transmission surface 422, and the second linear driver 43 is not parallel to the second transmission surface 422. In this embodiment, the output end of the second linear driver 43 is not fixed to the second driving member 42, but is only pressed on the second driving member 42. One end of the second elastic member 44 is fixed to the second driving member 42, and the other end of the second elastic member 44 abuts against the cover body 1. In the axial direction of the second linear driver 43, the second linear driver 43 and the second elastic member 44 are respectively located on the two sides of the second driving member 42. The cover body 1 is fixedly provided with the first stop pin 13, and the end of the first stop pin 13 presses the second shielding member 41 on the cover body 1 in the axial direction of the second linear driver 43. Therefore, the second linear driver 43 can control the second driving member 42 to move bidirectionally in the axial direction of the second linear driver 43, so as to control the second shielding member 41 to move linearly on the inner wall of the cover body 1, thereby achieving the purpose of changing the air exchange area of the second air exchange hole 12.

[0050] Referring to Figure 10 , the air exchange cover further comprises a rotating assembly 3, the rotating assembly 3 comprising a rotating driver 33, a rotating shaft 31 and a first transmission rod 32. The first transmission rod 32 is fixed to the outer wall of the rotating shaft 31 and extends radially along the rotating shaft 31. The output end of the rotating driver 33 is installed on the end of the rotating shaft 31. Figure 6 and Figure 11 The rotating driver 33 is installed on the cover body 1, so that the rotating shaft 31 is arranged to rotate on the cover body 1, and the rotating shaft 31 is parallel to the second linear driver 43. Figures 7-8 A spiral transmission groove 421 is arranged on the second driving member 42, and the spiral transmission groove 421 is coaxially arranged with the rotating shaft 31. The first transmission rod 32 is inserted into the spiral transmission groove 421.

[0051] The first guide groove 411 extends radially along the rotating shaft 31, and the second guide groove 412 extends circumferentially along the rotating shaft 31. The first guide groove 411 and the second guide groove 412 are communicated. The first stop pin 13 is inserted into the first guide groove 411 or the second guide groove 412, and the end of the first stop pin 13 is located outside the first guide groove 411 and the second guide groove 412, so as to press the second shielding member 41 on the cover body 1 in the axial direction of the rotating shaft 31.

[0052] When the first stop pin 13 is located at the second guide slot 412, the second linear driver 43 and the second elastic member 44 cooperate to enable the second driving member 42 to be positioned on the axis of the rotating shaft 31 in the cover 1, and correspondingly, the second shielding member 41 is positioned in the radial direction of the rotating shaft 31 in the cover 1. At this time, the rotating driver 33 controls the rotating shaft 31 to rotate, and the rotating shaft 31 can drive the second shielding member 41 to rotate through the first transmission rod 32, and at the same time, the first stop pin 13 slides in the second guide slot 412. Thus, the second shielding member 41 can avoid or shield the second air exchange hole 12 through rotation around the axis of the rotating shaft 31, so as to change the air exchange area of the second air exchange hole 12.

[0053] It can be understood that although the second linear driver 43 is installed on the inner wall of the cover 1, since the output end of the second linear driver 43 is not fixed with the second driving member 42 but is only pressed, the second linear driver 43 will not prevent the second driving member 42 from rotating during the rotation of the second driving member 42. At the same time, since one end of the second elastic member 44 is fixed on the second driving member 42 and the other end is only pressed on the inner wall of the cover 1, the second elastic member 44 will not prevent the second driving member 42 from rotating and will rotate together with the second driving member 42, so as to be always pressed between the second driving member 42 and the inner wall of the cover 1.

[0054] When the first stop pin 13 is located at the first guide slot 411, the second linear driver 43 and the second elastic member 44 cooperate to adjust the position of the second driving member 42 in the cover 1 in the axial direction of the rotating shaft 31, so as to control the movement of the second shielding member 41 in the radial direction of the rotating shaft 31, thereby avoiding or shielding the second air exchange hole 12, so as to change the air exchange area of the second air exchange hole 12. During the movement of the second driving member 42 in the axial direction of the rotating shaft 31, the second driving member 42 will act on the first transmission rod 32. At this time, in order to avoid the axial movement of the rotating shaft 31, the rotating driver 33 needs to control the rotating shaft 31 to rotate at the same time.

[0055] In summary, the second linear driver 43 and the rotating driver 33 need to be electrically connected. When the first stop pin 13 is located at the second guide slot 412, only the rotating driver 33 works. When the first stop pin 13 is located at the second guide slot 412, the second linear driver 43 and the rotating driver 33 need to work at the same time.

[0056] The embodiment also provides a cooking box, which comprises a box body and the aforementioned air exchange cover. The air exchange cover is installed on the box body, and the first air exchange hole 11 and the second air exchange hole 12 are located in the box body.

[0057] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered as within the scope of the present disclosure.

[0058] The above-described embodiments only express several implementation manners of the present application, the description is relatively specific and detailed, but it shall not be understood as a limitation on the scope of the present application patent. It should be pointed out that, for ordinary skilled in the art, under the premise of not departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent shall be subject to the appended claims.

Claims

1. A ventilation cover, characterized in that, The device includes a cover (1) and a first adjustment assembly (2). The cover (1) has a first ventilation hole (11). The first adjustment assembly (2) includes a first shield (21), a first drive (22) and a first linear actuator (23). The first shield (21) is slidably disposed on the inner wall of the cover (1) to avoid or block the first ventilation hole (11). The first shield (21) is provided with a first transmission surface (211). The first drive (22) is slidably disposed on the first transmission surface (211). The first linear actuator (23) is mounted on the cover (1) and is inclined relative to the first transmission surface (211) to squeeze the first drive (22).

2. The ventilation cover according to claim 1, characterized in that, The first adjustment component (2) further includes a first elastic element (24), one end of which is fixed to the inner wall of the cover (1), and the other end of which abuts against the first drive element (22). The output end of the first linear actuator (23) presses against the first drive element (22). In the axial direction of the first linear actuator (23), the first elastic element (24) and the first linear actuator (23) are located on both sides of the first drive element (22).

3. The ventilation cover according to claim 1, characterized in that, The first ventilation hole (11) extends along the first direction. The first shielding member (21) is provided with a third guide groove (212) extending along the first direction. The third guide groove (212) is inclined relative to the first transmission surface (211). The cover (1) is fixedly provided with a second stop pin (14). The second stop pin (14) is inserted into the third guide groove (212). The end of the second stop pin (14) presses the first shielding member (21) onto the cover (1).

4. The ventilation cover according to claim 1, characterized in that, The first transmission surface (211) is provided with a first slide groove (213), and the first driving member (22) is provided with a first slide bar (221). The first slide bar (221) is slidably disposed in the first slide groove (213) so that the first driving member (22) is positioned on the first shielding member (21) in the normal direction of the first transmission surface (211).

5. The ventilation cover according to claim 1, characterized in that, The ventilation cover also includes a rotating assembly (3) and a second adjusting assembly (4), and a second ventilation hole (12) is provided on the cover body (1); The rotating assembly (3) includes a rotating shaft (31) and a first transmission rod (32). The first transmission rod (32) is fixed to the outer wall of the rotating shaft (31) and extends radially along the rotating shaft (31). The second adjusting assembly (4) includes a second blocking member (41), a second driving member (42), and a second linear driver (43). The rotating shaft (31) is rotatably mounted on the cover (1), and the second blocking member (41) is axially positioned on the cover (1) along the rotating shaft (31). The second driving member (42) has a spiral transmission groove (421) which is coaxially mounted with the rotating shaft (31). The first transmission rod (32) is inserted into the spiral transmission groove (421) to allow the second blocking member (41) to avoid or block the second ventilation hole (12) by rotating around the axis of the rotating shaft (31). The second drive member (42) is provided with a second transmission surface (422), which is inclined relative to the rotating shaft (31). The second shield (41) is slidably disposed on the second transmission surface (422). The second linear actuator (43) is mounted on the cover (1) for pressing the second drive member (42).

6. The ventilation cover according to claim 5, characterized in that, The second adjustment component (4) further includes a second elastic element (44), one end of which is fixed to the second drive element (42), and the other end of which abuts against the cover (1). In the axial direction of the second linear drive (43), the second linear drive (43) and the second elastic element (44) are located on both sides of the second drive element (42).

7. The ventilation cover according to claim 5, characterized in that, The rotating assembly (3) further includes a rotating driver (33) mounted on the cover (1) for controlling the rotation of the shaft (31), and the second linear driver (43) is electrically connected to the rotating driver (33).

8. The ventilation cover according to claim 5, characterized in that, The second shielding member (41) is provided with a first guide groove (411) and a second guide groove (412). The first guide groove (411) extends radially along the rotating shaft (31), and the second guide groove (412) extends circumferentially along the rotating shaft (31). The first guide groove (411) and the second guide groove (412) are connected. The cover (1) is fixedly provided with a first stop pin (13). The first stop pin (13) is inserted into the first guide groove (411) or the second guide groove (412). The end of the first stop pin (13) presses the second shielding member (41) axially along the rotating shaft (31) onto the cover (1).

9. The ventilation cover according to claim 5, characterized in that, The second shielding member (41) is provided with a second slide groove (413), and the second driving member (42) is provided with a second slide bar (423). The second slide bar (423) is slidably disposed in the second slide groove (413) so that the second shielding member (41) is positioned on the second driving member (42) in the normal direction of the second transmission surface (422).

10. A cooking box, characterized in that, It includes a housing and a ventilation cover as described in any one of claims 1-9, the ventilation cover being mounted on the housing, and the first ventilation hole (11) being located inside the housing.

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