A smoke deflector moving mechanism of a range hood

Abstract

A kind of range hood baffle movement mechanism, including smoke inlet cavity and baffle, the front side of smoke inlet cavity is provided with air inlet, baffle is located at air inlet and moves relative to air inlet under the drive of drive mechanism, baffle includes side by side arranged first baffle and second baffle, drive mechanism includes main drive mechanism and sub drive mechanism arranged in smoke inlet cavity, first baffle and second baffle move synchronously under the drive of main drive mechanism, first baffle and second baffle can be individually moved under the drive of main drive mechanism or sub drive mechanism.The advantage of the present application is that: the first baffle and second baffle of the range hood can move synchronously under the drive of main drive mechanism, and can be individually moved under the drive of main drive mechanism or sub drive mechanism, so that two baffle can be opened and closed synchronously, and one of baffle can be opened and closed individually, to adapt to different working conditions of stove.

Description

TECHNICAL FIELD

[0001] The present application relates to a range hood, in particular to a range hood smoke baffle movement mechanism. BACKGROUND

[0002] The range hood has become one of the indispensable kitchen household appliances in modern families. In order to improve the effect of absorbing oil fume, the current common method is to increase the area covered by the air inlet. For example, the Chinese utility model patent with the patent number 202020176183.3 (the authorized announcement number is CN211600839U) discloses an oil fume extractor. The oil fume extractor includes a shell provided with a main air inlet, an air suction device installed on the shell, and an oil cup arranged at the bottom of the shell. The shell is further provided with an auxiliary air inlet spaced from the main air inlet. The shell is pivotally connected with a panel capable of opening and closing the auxiliary air inlet. The auxiliary air inlet includes a plurality of second mesh holes arranged in an array. In order to cover a larger area of the air inlet, the panel on the entire front side is designed to be reversible, forming a thin range hood, which has a light and thin appearance. However, this kind of range hood has the following problems: in order to ensure that the panel does not block the line of sight when the range hood is working, the angle of the panel opening needs to be controlled. However, a smaller opening angle of the panel will result in a smaller smoke collection area of the range hood and a poorer effect of absorbing oil fume. When the opening angle of the panel is increased, the distance between the smoke baffle and the user will be reduced, which will not only block the line of sight but also cause a sense of oppression to the user. In order to solve the above problems, the Chinese utility model patent with the patent number 202121041391.3 (the authorized announcement number is CN215863590U) discloses an oil fume extractor. The smoke baffle of the oil fume extractor opens and closes the air inlet in a translational manner, which can increase the distance between the smoke baffle and the user in the open state, thereby reducing the risk of blocking the line of sight. Moreover, the smoke collection cavity is increased, the effect of absorbing oil fume is improved, and the two air inlets can be matched to adapt to different cooking states. The smoke baffle remains in a vertical state and translates perpendicularly to the horizontal direction, which can further reduce the risk of blocking the line of sight and further increase the smoke collection cavity and improve the effect of absorbing oil fume. The smoke baffle of the oil fume extractor is always located outside the air inlet under different oil fume working conditions, and can only move in the horizontal direction. Under the condition of large oil fume, although the smoke collection area can be increased by moving the smoke baffle forward, the negative pressure area cannot be moved downward, and the effect of absorbing oil fume can be further improved. Moreover, the smoke baffle of the oil fume extractor is a whole plate, which can only be translated as a whole to open the air inlet when one of the left and right burners is turned on during cooking. Therefore, the oil fume extractor needs to be further improved. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a range hood smoke baffle movement mechanism with two smoke baffles that can be opened simultaneously or individually.

[0004] The technical scheme adopted by the present application to solve the above technical problems is: a smoke deflector movement mechanism of an extractor hood, comprising an air inlet cavity and a smoke deflector, an air inlet is formed on the front side of the air inlet cavity, the smoke deflector is arranged at the air inlet and moves relative to the air inlet under the drive of a drive mechanism, characterized in that: the smoke deflector comprises a first smoke deflector and a second smoke deflector arranged side by side, the drive mechanism comprises a main drive mechanism and a sub drive mechanism arranged in the air inlet cavity, the first smoke deflector and the second smoke deflector move synchronously under the drive of the main drive mechanism, and the first smoke deflector and the second smoke deflector can move individually under the drive of the main drive mechanism or the sub drive mechanism.

[0005] The first smoke deflector and the second smoke deflector can make oblique translational movement relative to the air inlet, and the first smoke deflector and the second smoke deflector always remain in a vertical position during the oblique translational movement.

[0006] In order to adapt to different working conditions of large and small oil fume, the first smoke deflector and the second smoke deflector can be obliquely translated forward and downward to extend to the front side of the air inlet, the first smoke deflector and the second smoke deflector can be moved to be flush with the front side plate of the air inlet cavity to close the air inlet, and the first smoke deflector and the second smoke deflector can be translated backward and upward to be withdrawn to the rear side of the air inlet.

[0007] Further preferably, in the state that the first smoke deflector and the second smoke deflector are both extended to the front side of the air inlet, the lower edge of the first smoke deflector and the second smoke deflector is lower than the lower edge of the air inlet to form a lower air inlet gap, and the top of the first smoke deflector and the second smoke deflector is connected with the lower edge of the front side plate of the air inlet cavity through an upper connecting plate to close an upper air inlet gap. In this way, in the large oil fume working condition, the negative pressure area expands and moves downward, the airflow at the air inlet is larger, and the oil fume extraction effect is better.

[0008] Further preferably, in the state that the first smoke deflector and the second smoke deflector are withdrawn to the rear side of the air inlet, there is an upper air inlet gap between the upper edge of the first smoke deflector and the second smoke deflector and the front side plate of the air inlet cavity, and there is a lower air inlet gap between the lower edge of the first smoke deflector and the second smoke deflector and the bottom plate of the air inlet cavity. In this way, the oil fume can enter the air inlet cavity through the upper and lower air inlet gaps of the smoke deflector, and at this time, the air inlet gap is usually small, which is suitable for small oil fume working condition, in addition, the smoke deflector is withdrawn to the rear side of the air inlet, which can solve the problem of collision with the pot caused by the pot being too high in the current weak pot boiling or steaming position state.

[0009] In order to make the smoke deflector move to the appropriate position in different working conditions, in the large oil fume working condition, the first smoke deflector and / or the second smoke deflector is obliquely translated forward and downward to extend to the front side of the air inlet, and in the small oil fume working condition, the first smoke deflector and / or the second smoke deflector is translated backward and upward to be withdrawn to the rear side of the air inlet.

[0010] The driving mechanism can adopt various structures. Preferably, the main driving mechanism comprises a main driving motor, a first gear and a first linkage assembly, the first linkage assembly is connected between the output shaft of the main driving motor and the first smoke baffle, the first gear is installed on the output shaft of the main driving motor, the auxiliary driving mechanism comprises an auxiliary driving motor, a second gear and a second linkage assembly, the second linkage assembly is connected between the output shaft of the main driving motor and the second smoke baffle, the second gear is installed on the output shaft of the auxiliary driving motor, and further comprising a transversely arranged transmission shaft, the first end of the transmission shaft is provided with a first transmission gear, the second end of the transmission shaft is provided with a second transmission gear, the first transmission gear is a full gear and is always engaged with the first gear, and the second transmission gear is a half gear and is intermittently engaged with the second gear.

[0011] In order to smoothly drive the first gear and the second gear through the transmission shaft, the first transmission gear is arranged directly above the first gear, the second transmission gear is arranged directly above the second gear, and the transmission shaft is horizontally arranged, and a supporting plate for supporting the transmission shaft is arranged below the transmission shaft.

[0012] Further preferably, further comprising a first mounting seat and a second mounting seat, the main driving motor is installed on the outer side of the first mounting seat, the first gear and the first linkage assembly are arranged on the inner side of the first mounting seat, the auxiliary driving motor is installed on the outer side of the second mounting seat, the second gear and the second linkage assembly are arranged on the inner side of the second mounting seat, and the transmission shaft is arranged between the first mounting seat and the second mounting seat.

[0013] Further preferably, the first linkage assembly comprises a first linkage, a second linkage, a third linkage, a fourth linkage and a fifth linkage, the first linkage and the third linkage are both arranged obliquely upward from back to front and parallel to each other, and the first linkage is arranged on the front side of the third linkage, the second linkage is horizontally arranged, the front end of the second linkage is connected to the upper end of the first linkage at a first rotation point, the rear end of the second linkage is connected to the upper end of the third linkage at a second rotation point, the lower end of the first linkage is connected to a third rotation point of the first mounting seat, the lower part of the third linkage is connected to a fourth rotation point of the first mounting seat, the line connecting the first rotation point and the second rotation point is parallel to the line connecting the third rotation point and the fourth rotation point, the first rotation point is arranged on the back of the first smoke baffle, the third linkage extends downward from the fourth rotation point and is rotationally connected to the first end of the fourth linkage, the second end of the fourth linkage is rotationally connected to the first end of the fifth linkage, and the second end of the fifth linkage is installed on the output shaft of the main driving motor. In this way, under the driving of the main driving motor, the smoke baffle can be driven to translate forward and downward or upward and backward through the transmission of the linkage assembly, so as to adapt to different oil smoke working conditions.

[0014] Compared with the prior design, the advantages of the present application are that the first baffle and the second baffle of the baffle movement mechanism of the range hood are arranged side by side at the air inlet, and the first baffle and the second baffle can move synchronously under the driving of the main driving mechanism, and can also move individually under the driving of the main driving mechanism or the auxiliary driving mechanism, so that the two baffles can be opened and closed synchronously, and one of the baffles can be opened and closed individually, for example, when the left and right cooktops are both in use, the two baffles can be opened, and when the single-sided cooktop is in use, the baffle on the corresponding side can be opened. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Fig. 4 is a structural schematic diagram of the embodiment of the present application in the state that the two baffles are both opened;

[0016] Figure 2 Fig. 5 is a structural schematic diagram of the embodiment of the present application in the state that the left baffle is opened and the right baffle is closed; Figure 1 Fig. 6 is a structural schematic diagram of the embodiment of the present application in the state that the left and right baffles are both closed, with the outer cover of the smoke inlet cavity removed;

[0017] Figure 3 Fig. 7 is a sectional view of the structure shown in Fig. 6; Figure 1

[0018] Figure 4 Fig. 8 is a structural schematic diagram of the embodiment of the present application in the state that the left baffle is opened and the right baffle is closed, with the outer cover of the smoke inlet cavity removed;

[0019] Figure 5 Fig. 9 is a structural schematic diagram of the embodiment of the present application in the state that the left and right baffles are both closed, with the outer cover of the smoke inlet cavity removed; Figure 4

[0020] Figure 6 Fig. 10 is a structural schematic diagram of the embodiment of the present application in the state that the left and right baffles are both closed;

[0021] Figure 7 Fig. 11 is a structural schematic diagram of the embodiment of the present application in the state that the left baffle is opened and the right baffle is closed, with the outer cover of the smoke inlet cavity removed; Figure 6

[0022] Figure 8 Fig. 12 is a sectional view of the structure shown in Fig. 11; Figure 6

[0023] Figure 9 Fig. 13 is a structural schematic diagram of the embodiment of the present application in the state that the left baffle is opened and the right baffle is closed;

[0024] Figure 10 Fig. 14 is a structural schematic diagram of the embodiment of the present application in the state that the left baffle is opened and the right baffle is closed, with the outer cover of the smoke inlet cavity removed; Figure 9

[0025] Figure 11 Fig. 15 is a sectional view of the structure shown in Fig. 14. Figure 9 DETAILED DESCRIPTION

[0026] ​​​​​​The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] like Figures 1 to 11 As shown, the smoke baffle movement mechanism of this embodiment includes a smoke inlet chamber 1 and a smoke baffle. An air inlet 3 is opened on the front side of the smoke inlet chamber 1. The smoke baffle is located at the air inlet 3 and moves relative to the air inlet 3 under the drive of the driving mechanism. Specifically, the smoke baffle includes a first smoke baffle 21 and a second smoke baffle 22 arranged side-by-side. The driving mechanism includes a main driving mechanism 4 and a secondary driving mechanism 5 located within the smoke inlet chamber 1. The first smoke baffle 21 and the second smoke baffle 22 move synchronously under the drive of the main driving mechanism 4. The first smoke baffle 21 can move independently under the main driving mechanism 4, and the second smoke baffle 5 can move independently under the drive of the secondary driving mechanism 5.

[0028] The main drive mechanism 4 in this embodiment includes a main drive motor 41, a first gear 42, and a first linkage assembly 43. The main drive motor 41 is mounted on the outside of the first mounting base 91, and the first gear 42 and the first linkage assembly 43 are located on the inside of the first mounting base 91. The first linkage assembly 43 connects the output shaft of the main drive motor 41 and the first smoke baffle 21. The first gear 42 is mounted on the output shaft of the main drive motor 41. The auxiliary drive mechanism 5 includes an auxiliary drive motor 51, a second gear 52, and a second linkage assembly 53. The auxiliary drive motor 51 is mounted on the outside of the second mounting base 92, and the second gear 52 and the second linkage assembly 53 are located on the inside of the second mounting base 92. The second gear 52 is mounted on the output shaft of the auxiliary drive motor 42, and the second linkage assembly 53 connects the output shaft of the main drive motor 41 and the second smoke baffle 22.

[0029] The main drive mechanism 4 and the auxiliary drive mechanism 5 can be linked through a transmission shaft 6. The transmission shaft 6 is horizontally arranged between the first mounting base 91 and the second mounting base 92. A support plate 8 is provided below the transmission shaft 6 to support it. A first transmission gear 71 is installed at the first end of the transmission shaft 6, located directly above the first gear 42. The first transmission gear 71 is a full gear and always meshes with the first gear 42. A second transmission gear 72 is installed at the second end of the transmission shaft 6, located directly above the second gear 52. The second transmission gear 72 is a half gear and intermittently meshes with the second gear 52. Driven by the main drive motor 41, when the transmission shaft 6 drives the second transmission gear 72 to mesh with the second gear 52, the main drive motor 41 can drive the first smoke baffle 21 and the second smoke baffle 22 to move synchronously, that is, to open and close synchronously. When the transmission shaft 6 drives the second transmission gear 72 to rotate until it is no longer meshed with the second gear 52, the first smoke baffle 21 can be opened and closed independently under the drive of the main drive motor 41, and the second smoke baffle 22 can be opened and closed independently under the drive of the auxiliary drive motor 51.

[0030] The first connecting rod assembly 43 of the embodiment comprises a first connecting rod 431, a second connecting rod 432, a third connecting rod 433, a fourth connecting rod 434 and a fifth connecting rod 435. The first connecting rod 431 and the third connecting rod 433 are both inclined upward from back to front and parallel to each other, and the first connecting rod 431 is arranged at the front side of the third connecting rod 433. The second connecting rod 432 is arranged horizontally, and the front end of the second connecting rod 432 is connected to the upper end of the first connecting rod 431 at a first rotation point, and the rear end of the second connecting rod 432 is connected to the upper end of the third connecting rod 433 at a second rotation point. The lower end of the first connecting rod 431 is connected to a third rotation point of the first mounting base 91, and the lower part of the third connecting rod 433 is connected to a fourth rotation point of the first mounting base 91. The line connecting the first rotation point and the second rotation point is parallel to the line connecting the third rotation point and the fourth rotation point, so that the first connecting rod 431, the second connecting rod 432, the third connecting rod 433 and the first mounting base 91 form a four-connecting-rod mechanism. The first rotation point is arranged at the back of the first smoke baffle 21, and the third connecting rod 433 extends downward from the fourth rotation point and is rotationally connected to the first end of the fourth connecting rod 434. The second end of the fourth connecting rod 434 is rotationally connected to the first end of the fifth connecting rod 435, and the second end of the fifth connecting rod 435 is mounted on the output shaft of the main drive motor 41. The structure and action principle of the second connecting rod assembly 53 of the embodiment are the same as those of the first connecting rod assembly 43, and will not be described in detail here.

[0031] In addition, an electric push rod can also be used to replace the drive motor. At this time, the fourth connecting rod and the fifth connecting rod can be omitted, and the power input end of the third connecting rod 433 can be mounted on the output end of the electric push rod. The electric push rod acts on the power input end to drive the third connecting rod 433 to rotate relative to the fourth rotation point, and the oblique translation movement of the first smoke baffle 21 can also be realized.

[0032] After the above-mentioned first connecting rod assembly 43 and the second connecting rod assembly 53 are used, the first smoke baffle 21 and the second smoke baffle 22 can make oblique translation movement relative to the air inlet 3, and the first smoke baffle 21 and the second smoke baffle 22 always remain in the vertical position during the oblique translation movement.

[0033] As shown in FIG. 1, the first smoke baffle 21 and the second smoke baffle 22 are arranged on the left and right sides of the air inlet 3, respectively, and the first smoke baffle 21 and the second smoke baffle 22 are arranged in parallel and symmetrically relative to the air inlet 3. Figures 1 to 3 As shown in FIG. 1, the first smoke baffle 21 and the second smoke baffle 22 are arranged on the left and right sides of the air inlet 3, respectively, and the first smoke baffle 21 and the second smoke baffle 22 are arranged in parallel and symmetrically relative to the air inlet 3. Figure 3The direction indicated by the middle arrow A is the front side, the first smoke baffle 21 and the second smoke baffle 22 are both inclined to the front and downward and extended to the front side of the air inlet 3, at this time, the first smoke baffle 21 and the second smoke baffle 22 are both in the open state, the lower edge of the first smoke baffle 21 and the second smoke baffle 22 is lower than the lower edge of the air inlet 3 to form the lower air inlet gap 31, at this time, it is in the strong gear, the negative pressure area expands outward and downward, the airflow at the air inlet is larger, the oil fume suction effect is better, and it is suitable for large oil fume working conditions. The top of the first smoke baffle 21 and the second smoke baffle 22 is connected with the lower edge of the front side plate 11 of the smoke inlet cavity through the upper connecting plate 23 to close the upper air inlet gap 32.

[0034] As shown in Figure 4 and Figure 5 , the second transmission gear 72 rotates to be not engaged with the second gear 52, that is, in the intermittent state, at this time, the first smoke baffle 21, that is, the left smoke baffle, is opened alone under the drive of the main drive motor 41, and the second smoke baffle 22 is in the closed state. This state is suitable for the condition that the left stove head is started and the right stove head is closed.

[0035] As shown in Figures 6 to 8 , the first smoke baffle 21 and the second smoke baffle 22 can be moved to be flush with the front side plate 11 of the smoke inlet cavity to close the air inlet 3, and the first smoke baffle 21 and the second smoke baffle 22 are in the synchronous closed state, at this time, the range hood is in the shutdown state, and the overall appearance of the smoke inlet cavity 1 is more simple.

[0036] As shown in Figures 9 to 11 , the first smoke baffle 21 and the second smoke baffle 22 can be translated to the rear and upward to be withdrawn to the rear side of the air inlet 3. At this time, the upper edge of the first smoke baffle 21 and the second smoke baffle 22 and the front side plate 11 of the smoke inlet cavity exist the upper air inlet gap 32, and the lower edge of the first smoke baffle 21 and the second smoke baffle 22 and the bottom plate 12 of the smoke inlet cavity exist the lower air inlet gap 31. At this time, in the small oil fume working condition, it is in the weak gear, and the problem that the pot is collided due to the pot being too high in the weak gear state of the current soup boiling or steaming can be solved.

[0037] In the specification and claims of the present application, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc. are used to describe various example structural parts and elements of the present application, but these terms are used herein only for the purpose of convenience of description and are determined based on the example orientation shown in the drawings. Since the disclosed embodiments of the present application can be arranged in different directions, these terms indicating directions are only for illustration and should not be considered as limitations, such as "upper", "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity.

Claims

1. A smoke baffle moving mechanism for a range hood, comprising a smoke inlet chamber (1) and a smoke baffle, wherein an air inlet (3) is provided on the front side of the smoke inlet chamber (1), and the smoke baffle is disposed at the air inlet (3) and moves relative to the air inlet (3) under the drive of a driving mechanism, characterized in that: The smoke baffle includes a first smoke baffle (21) and a second smoke baffle (22) arranged side by side. The driving mechanism includes a main driving mechanism (4) and a secondary driving mechanism (5) located in the smoke inlet chamber (1). The first smoke baffle (21) and the second smoke baffle (22) move synchronously under the drive of the main driving mechanism (4). The first smoke baffle (21) and the second smoke baffle (22) can move independently under the drive of the main driving mechanism (4) or the secondary driving mechanism (5). The main driving mechanism (4) includes a main driving motor (41), a first gear (42), and a first connecting rod assembly (43). The first connecting rod assembly (43) is connected between the output shaft of the main driving motor (41) and the first smoke baffle (21). The first gear (42) is mounted on the main driving motor. On the output shaft of the drive motor (41), the auxiliary drive mechanism (5) includes an auxiliary drive motor (51), a second gear (52), and a second linkage assembly (53). The second linkage assembly (53) is connected between the output shaft of the main drive motor (41) and the second smoke baffle (22). The second gear (52) is installed on the output shaft of the auxiliary drive motor (51). It also includes a transversely arranged transmission shaft (6). The first end of the transmission shaft (6) is equipped with a first transmission gear (71), and the second end of the transmission shaft (6) is equipped with a second transmission gear (72). The first transmission gear (71) is a full gear and always meshes with the first gear (42). The second transmission gear (72) is a half gear and intermittently meshes with the second gear (52).

2. The smoke baffle moving mechanism of the range hood according to claim 1, characterized in that: The first smoke baffle (21) and the second smoke baffle (22) can move obliquely relative to the air inlet (3), and the first smoke baffle (21) and the second smoke baffle (22) always remain in a vertical position during the oblique translation movement.

3. The smoke baffle moving mechanism of the range hood according to claim 2, characterized in that: The first smoke baffle (21) and the second smoke baffle (22) can be moved forward and downward at an angle and extended to the front side of the air inlet (3). The first smoke baffle (21) and the second smoke baffle (22) can be moved to be flush with the front side plate (11) of the smoke inlet chamber and close the air inlet (3). The first smoke baffle (21) and the second smoke baffle (22) can be moved backward and upward and retracted to the rear side of the air inlet (3).

4. The smoke baffle moving mechanism of the range hood according to claim 3, characterized in that: With the first smoke baffle (21) and the second smoke baffle (22) both extending to the front side of the air inlet (3), the lower edges of the first smoke baffle (21) and the second smoke baffle (22) are lower than the lower edge of the air inlet (3) to form a lower air inlet gap (31). The tops of the first smoke baffle (21) and the second smoke baffle (22) are connected to the lower edge of the front side plate (11) of the smoke inlet chamber through the upper connecting plate to close the upper air inlet gap (32).

5. The smoke baffle moving mechanism of the range hood according to claim 3, characterized in that: With the first smoke baffle (21) and the second smoke baffle (22) retracted to the rear side of the air inlet (3), there is an upper air inlet gap (32) between the upper edge of the first smoke baffle (21) and the second smoke baffle (22) and the front side plate (11) of the smoke inlet chamber, and a lower air inlet gap (31) between the lower edge of the first smoke baffle (21) and the second smoke baffle (22) and the bottom plate (12) of the smoke inlet chamber.

6. The smoke baffle moving mechanism of the range hood according to claim 3, characterized in that: Under heavy oil fume conditions, the first smoke baffle (21) and / or the second smoke baffle (22) move diagonally forward and downward to extend to the front side of the air inlet (3). Under light oil fume conditions, the first smoke baffle (21) and / or the second smoke baffle (22) move backward and upward to retract to the rear side of the air inlet (3).

7. The smoke baffle moving mechanism of the range hood according to claim 1, characterized in that: The first transmission gear (71) is located directly above the first gear (42), the second transmission gear (72) is located directly above the second gear (52), the transmission shaft (6) is horizontally arranged, and a support plate (8) for supporting the transmission shaft (6) is provided below the transmission shaft (6).

8. The smoke baffle moving mechanism of the range hood according to claim 1, characterized in that: It also includes a first mounting base (91) and a second mounting base (92). The main drive motor (41) is mounted on the outside of the first mounting base (91). The first gear (42) and the first connecting rod assembly (43) are located on the inside of the first mounting base (91). The auxiliary drive motor (51) is mounted on the outside of the second mounting base (92). The second gear (52) and the second connecting rod assembly (53) are located on the inside of the second mounting base (92). The transmission shaft (6) is located between the first mounting base (91) and the second mounting base (92).

9. The smoke baffle moving mechanism of the range hood according to claim 8, characterized in that: The first link assembly (43) includes a first link (431), a second link (432), a third link (433), a fourth link (434), and a fifth link (435). The first link (431) and the third link (433) are both inclined upwards from back to front and are parallel to each other. The first link (431) is located in front of the third link (433). The second link (432) is horizontally arranged. The front end of the second link (432) is connected to the upper end of the first link (431) at a first rotation point, and the rear end of the second link (432) is connected to the upper end of the third link (433) at a second rotation point. The lower end of the third link (431) is connected to the third rotation point of the first mounting base (91), and the lower part of the third link (433) is connected to the fourth rotation point of the first mounting base (91). The line connecting the first rotation point and the second rotation point is parallel to the line connecting the third rotation point and the fourth rotation point. The first rotation point is located on the back of the first smoke baffle (21). The third link (433) extends backward and downward from the fourth rotation point and is rotatably connected to the first end of the fourth link (434). The second end of the fourth link (434) is rotatably connected to the first end of the fifth link (435). The second end of the fifth link (435) is mounted on the output shaft of the main drive motor (41).

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