Smoke plate movement mechanism for range hood and range hood

Abstract

The utility model relates to a smoke plate movement mechanism and range hood for range hood, and the smoke plate movement mechanism includes: movable smoke plate, two parallelogram link assemblies are arranged along the length direction interval of movable smoke plate, and the free end of two parallelogram link assemblies is connected with movable smoke plate, linkage lever is rotatable in the mode of around own axis and is arranged on the corresponding component of range hood, still include drive motor, the output shaft of drive motor is connected with linkage lever, and linkage lever is driven to rotate, linkage lever and two parallelogram link assemblies are all connected through crank link assembly transmission, thereby the rotation moment of linkage lever is transmitted to two parallelogram link assemblies through corresponding crank link assembly to drive movable smoke plate to translate. The advantage lies in: effectively promoted the synchronous precision of movable smoke plate double -sided movement and the compactness of overall structure.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, and in particular to a smoke plate moving mechanism for a range hood and a range hood. Background Technology

[0002] Range hoods are an indispensable kitchen appliance in modern homes. To improve smoke extraction, range hoods typically have a baffle plate at the air inlet, which opens and closes by moving. Currently, the air inlet panels of existing range hoods are generally categorized into three types: single-section (full-screen), two-section (one section is a fixed panel, and the other is a movable baffle plate), and three-section (the top and bottom sections are fixed panels, and the middle section is a movable baffle plate). For two-section or three-section range hoods, there are at least two independent panels on the same plane. In traditional range hoods, the movable baffle plate opens and closes the air inlet by flipping.

[0003] To achieve a slim range hood design, existing technologies also employ movable smoke plates with a translational composite movement. These are essentially driven by a parallelogram linkage mechanism. For example, Chinese utility model patent application CN202021530141.1 discloses a range hood including a smoke collection chamber with an air inlet, a smoke guide plate adapted to close the air inlet, and a driving device adapted to drive the smoke guide plate. The smoke guide plate is configured to switch between a first position and a second position under the drive of the driving device. When the smoke guide plate is in the first position, it closes the air inlet; when it is in the second position... When the air inlet is open, the driving device includes a motor, a transmission crank, a first parallelogram mechanism, a second parallelogram mechanism, and a synchronizing rod. The motor is located in the smoke collection chamber and drives the transmission crank to rotate. The free end of the transmission crank is hinged to the synchronizing rod. One end of the synchronizing rod is connected to the first parallelogram mechanism, and the other end is connected to the second parallelogram mechanism. The frame components of both the first and second parallelogram mechanisms are located in the smoke collection chamber. The smoke guide plate moves under the combined action of the connecting rods of the first and second parallelogram mechanisms. The smoke guide plate can perform an oblique translational movement relative to the air inlet, and remains in a vertical position throughout the oblique translational movement.

[0004] The motion mechanism of the smoke baffle in the aforementioned patent application has certain shortcomings: the output shaft of the drive motor is directly connected to the transmission crank, and then connected to the synchronizing rod through the free end of the transmission crank. Finally, the synchronizing rod drives the two parallelogram mechanisms to move. The drive device is positioned in the middle of the left-right direction. Because this motion mechanism only drives the synchronizing rod through a single crank, the motion synchronization of the smoke baffles on the left and right sides is poor. It is easy for the two sides to move asynchronously due to gaps or errors in the transmission chain, affecting the smoothness of the opening and closing process of the smoke baffle. Secondly, there are many transmission links, and the structure is relatively complex. This not only increases the assembly difficulty but also increases friction and noise during operation. Long-term use is prone to wear and tear, affecting the service life. In addition, the overall layout is not compact enough, which is not conducive to achieving a thin design for the smoke machine. Utility Model Content

[0005] The first technical problem to be solved by this utility model is to provide a smoke plate movement mechanism for a range hood that can effectively improve the synchronization accuracy of the movement of both sides of the movable smoke plate and the compactness of the overall structure, in light of the current state of the technology.

[0006] The second technical problem to be solved by this utility model is to provide a range hood that uses the above-mentioned smoke plate movement mechanism, in view of the current state of the prior art.

[0007] The technical solution adopted by this utility model to solve the first technical problem is: a smoke plate moving mechanism for a range hood, comprising:

[0008] Movable smoke board;

[0009] Two parallelogram linkage assemblies are arranged at intervals along the length of the movable smoke plate, and the movable smoke plate is connected to the free ends of the two parallelogram linkage assemblies.

[0010] The linkage rod is rotatably mounted on the corresponding part of the range hood so that it can rotate around its own axis;

[0011] It also includes a drive motor, the output shaft of which is connected to the linkage rod and drives the linkage rod to rotate. The linkage rod and the two parallelogram linkage assemblies are all connected by a crank-connecting rod assembly, so that the rotational torque of the linkage rod is transmitted to the two parallelogram linkage assemblies through the corresponding crank-connecting rod assembly to drive the movable smoke plate to translate.

[0012] The aforementioned "parallelogram linkage assembly" refers to a four-bar linkage formed by multiple hinged links, wherein opposite links are of equal length and parallel, thereby ensuring that the output end always moves parallel to the input end.

[0013] As an improvement, the crank-connecting rod assembly includes a drive crank and a drive connecting rod. The first end of the drive crank is fixedly connected to the linkage rod, and the second end of the drive crank is hinged to the first end of the drive connecting rod. The second end of the drive connecting rod is hinged to the corresponding connecting rod (i.e., the first crank) of the parallelogram connecting rod assembly. Through the hinged design of the drive crank and the drive connecting rod, the rotational motion of the linkage rod is efficiently converted into the linear motion of the parallelogram connecting rod assembly, improving the flexibility and reliability of the transmission, reducing friction and wear between components, and extending the lifespan of the mechanism.

[0014] To further optimize the connection structure between the drive motor, the linkage, and the crank-connecting rod assembly, and to avoid assembly errors and low transmission efficiency caused by multiple independent connection points, the portion of the drive motor's drive shaft that is fixedly connected to the linkage is also connected to the first end of the transmission crank of the corresponding crank-connecting rod assembly. Directly connecting the drive motor's drive shaft to the linkage and transmission crank simplifies the structure, reduces the number of parts, improves the directness of transmission and overall rigidity, and ensures the synchronization and accuracy of torque transmission.

[0015] To ensure a secure connection between the drive motor output shaft, linkage, and transmission crank, and to prevent slippage or loosening during torque transmission, the first end of the transmission crank has a mounting hole. The drive motor output shaft has a first limiting mating surface along its axial direction. The corresponding end of the linkage has a slot for inserting the drive motor output shaft. The slot defines a second limiting mating surface that abuts and mates with the first limiting mating surface. The insertion of the drive motor output shaft into the slot of the linkage forms a combined mounting shaft portion. This combined mounting shaft portion can pass through the mounting hole of the transmission crank and forms a limiting relationship with the transmission crank in the circumferential direction. Through the abutment and mating of the first and second limiting mating surfaces, and the design of the combined mounting shaft portion, circumferential limiting is achieved, torque is effectively transmitted, connection stability and torsional resistance are improved, and the failure rate is reduced.

[0016] As an improvement, the combined mounting shaft can be inserted through the mounting hole of the drive crank and then fixed to the drive crank by radially arranged fasteners. Using radial fasteners (such as screws or pins) for fixing simplifies assembly, ensures a secure connection, facilitates maintenance and adjustment, and reduces the risk of loosening.

[0017] As an improvement, a third limiting mating surface extending axially is constructed on the outer wall surface of the corresponding end of the linkage rod, and a fourth limiting mating surface that abuts and matches the third limiting mating surface is constructed on the inner wall of the mounting hole at the first end of the transmission crank. Through the abutment and matching of the third and fourth limiting mating surfaces, additional circumferential limiting is achieved, improving transmission accuracy and synchronization, and ensuring consistent motion.

[0018] The "limiting mating surface" in this application can be understood as the surface where two components contact each other, which restricts relative movement through shape matching (such as a plane or a curved surface). For example, a planar limiting mating surface can prevent relative rotation between components and ensure torque transmission.

[0019] To reduce the machining difficulty and cost of the limiting mating surfaces while ensuring mating accuracy, as an improvement, the first, second, third, and fourth limiting mating surfaces are all planar. All limiting mating surfaces adopt a planar design, which facilitates machining and inspection, improves the contact quality and stability of the mating surfaces, and reduces manufacturing costs.

[0020] To facilitate the assembly of the drive motor output shaft and the linkage rod and avoid installation difficulties caused by space constraints, as an improvement, the slot on the linkage rod is an open slot with an opening on the side, the opening of which is opposite to the second limiting mating surface. The side-opening design of the slot on the linkage rod allows the output shaft to be inserted laterally, simplifying the assembly process, improving assembly efficiency, and facilitating on-site maintenance.

[0021] To improve the structural strength of the first end of the drive crank and prevent deformation or breakage under torque, the first end of the drive crank includes two opposing connecting plates and a fixed plate connected between the two connecting plates. Each of the two connecting plates has a mounting hole, through which the combined mounting shaft passes. The design of the two connecting plates and the fixed plate forms a stable frame structure, enhancing the rigidity and torsional resistance of the drive crank, dispersing stress, and improving durability.

[0022] As an improvement, the mounting holes on the two connecting plates extend to positions where they meet the fixed plate, so that corresponding portions of the fixed plate form the fourth limiting mating surface of the mounting holes. Extending the mounting holes to the fixed plate, making the fixed plate directly form the fourth limiting mating surface, increases the mating contact area, simplifies the structure, reduces the number of parts, and improves the reliability and accuracy of the limiting.

[0023] To facilitate the connection between the free end of the parallelogram linkage assembly and the movable smoke plate, a smoke plate support is provided on the back of the movable smoke plate. The parallelogram linkage assembly includes two parallel first cranks, the free ends of which are hinged to the smoke plate support. Through the hinge between the smoke plate support and the two first cranks, the movable smoke plate experiences uniform force, resulting in smoother movement, reduced shaking and noise, and improved service life and sealing performance.

[0024] The technical solution adopted by this utility model to solve the second technical problem is as follows: a range hood, including an air inlet box and a smoke plate moving mechanism. The smoke plate moving mechanism adopts the smoke plate moving mechanism for the range hood mentioned above. An air inlet is provided at the front of the air inlet box. The movable smoke plate can move relative to the air inlet box in a translational manner, thereby opening and closing the air inlet. When the movable smoke plate opens the air inlet, the movable smoke plate is located in front of and above the air inlet, and is generally attached to the front side of the air inlet box.

[0025] Compared with existing technologies, the advantages of this invention are as follows: The movable smoke plate mechanism of this invention is directly driven by a drive motor, which in turn drives the linkage rod, connecting it to the parallelogram linkage assemblies on both sides via independent crank-connecting rod assemblies. This structural design transforms a single input power source into a dual-sided transmission path, ensuring synchronous movement of the left and right sides of the movable smoke plate from the root of power distribution. This effectively eliminates asynchrony and jamming problems caused by transmission gaps or errors, significantly improving operational stability. Simultaneously, this solution greatly simplifies the transmission chain. In particular, the linkage rod, as the core transmission element, only rotates axially, occupying little space, resulting in a more compact and rational overall layout, and enabling a better realization of a thinner and smaller range hood design. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the movable panel motion mechanism according to an embodiment of the present utility model;

[0027] Figure 2 This is a three-dimensional structural diagram of the movable panel motion mechanism of this utility model from another angle;

[0028] Figure 3 This is a three-dimensional structural diagram of a portion of the movable panel motion mechanism according to an embodiment of the present utility model;

[0029] Figure 4 for Figure 3 An exploded view of some components of the movable panel motion mechanism shown in the figure;

[0030] Figure 5 for Figure 3A sectional perspective view of some components of the movable panel motion mechanism shown in the figure;

[0031] Figure 6 This is a three-dimensional structural diagram of the internal components of the smoke collection hood of the range hood according to an embodiment of the present utility model;

[0032] Figure 7 This is a right view of the range hood according to an embodiment of the present utility model. The right side panel of the smoke collection hood is omitted, and the smoke baffle and the movable panel are both in the closed state.

[0033] Figure 8 This is a right view of the range hood according to an embodiment of the present invention. The right side panel of the smoke collection hood is omitted, and the smoke baffle and the movable panel are both in the open state. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0035] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0036] Figures 1-8 A preferred embodiment of the range hood of this utility model is shown. The range hood includes a smoke collection hood 2 and a smoke plate moving mechanism. The smoke collection hood 2 includes a vertically extending air inlet box 21 and a protruding head 22 extending forward from the upper part of the air inlet box 21. The air inlet box 21 is generally a flat box structure with a left-right dimension larger than its front-back dimension, and a strip-shaped air inlet 210 extending in the left-right direction is opened at its front. A top suction port 220 is opened at the bottom of the protruding head 22, and a smoke baffle 23 is provided at the top suction port 220, which can be opened and closed by the top plate moving mechanism, thereby realizing a dual air intake mode of side suction and top suction. The top plate moving mechanism can adopt an existing hinge moving mechanism, which is prior art and will not be described in detail here.

[0037] A movable smoke plate 212 is provided at the air inlet 210 of the air inlet housing 21. Driven by a smoke plate movement mechanism, the movable smoke plate 212 can move relative to the air inlet housing 21 in a translational manner, thereby opening and closing the air inlet 210. The smoke plate movement mechanism includes a drive motor 32, two parallelogram connecting rod assemblies, two crank connecting rod assemblies, and a linkage rod 27. The two parallelogram connecting rod assemblies are arranged at intervals along the left-right direction. The movable smoke plate 212 is connected to the free ends of the two parallelogram connecting rod assemblies, thus ensuring that the movable smoke plate 212 maintains a vertical posture during movement through the movement of the parallelogram connecting rod assemblies, achieving translational motion.

[0038] The linkage rod 27 is rotatably mounted on the air inlet housing 21, allowing it to rotate around its own axis. The linkage rod 27 is connected to both parallelogram-shaped connecting rod assemblies via corresponding crank-connecting rod assemblies. Specifically, each crank-connecting rod assembly includes a transmission crank 261 and a transmission connecting rod 262. The first end of the transmission crank 261 is fixedly connected to the linkage rod 27, and the second end of the transmission crank 261 is hinged to the first end of the transmission connecting rod 262. The second end of the transmission connecting rod 262 is hinged to the corresponding connecting rod of the parallelogram-shaped connecting rod assembly (i.e., the first crank 251). Rotation of the linkage rod 27 causes the transmission crank 261 to swing, which in turn drives the parallelogram-shaped connecting rod assembly to move via the transmission connecting rod 262, ultimately causing the movable smoke plate 212 to translate.

[0039] To optimize airflow and prevent oil contamination, a mounting plate 31 is installed inside the air inlet housing 21 near its left side. The mounting plate 31 and the corresponding wall panel (such as the left side panel) of the air inlet housing 21 define a mounting chamber isolated from the air inlet duct of the air inlet housing 21. A drive motor 32 is located within the mounting chamber and fixed relative to the mounting plate 31. The output shaft 321 of the drive motor 32 is connected to the left end of the linkage rod 27 and drives the linkage rod 27 to rotate. By placing the drive motor 32 within the isolated mounting chamber, detaching it from the main air inlet duct, obstruction of the core airflow channel is effectively avoided, reducing wind resistance and pressure loss, while also minimizing high-temperature oil contamination, ensuring smooth operation and component lifespan.

[0040] The front of the air inlet housing 21, corresponding to the wall panel above the air inlet 210, is a fixed panel 211. With the air inlet 210 open (accessible via the movable smoke plate 212), the movable smoke plate 212 is positioned above and in front of the air inlet 210, and is generally abutted against the lower front side of the fixed panel 211 of the air inlet housing 21. A panel bracket 2121 is provided on the back of the movable panel 212 near its lower edge. The panel bracket 2121 itself forms an upper open U-shaped relief groove 2120 (i.e., the panel bracket 2121 has a groove structure), and the bottom edge of the fixed panel 211 is embedded in this groove. With the air inlet 210 open (accessible via the movable panel 212), the movable panel 212 is located in front of the fixed panel 211 and parallel to it, with at least the bottom edge of the fixed panel 211 embedded in the relief groove 2120. This design allows the movable panel 212 to move as high as possible, increasing the opening area of ​​the side air inlet 210, while ensuring that the movable panel 212 and the fixed panel 211 fit tightly together, reducing the front and rear dimensions of the overall structure and meeting the requirements of ultra-thin design.

[0041] See Figure 1 and Figure 2 In this embodiment, there are two mounting plates 31 arranged at a left-right interval, which are respectively located adjacent to the left and right sides of the air inlet box 21. The two ends of the linkage rod 27 are rotatably supported on the two mounting plates, thereby enhancing the rigidity and stability of the linkage rod 27, ensuring smooth rotation, and reducing movement deviation and wear.

[0042] The two parallelogram connecting rod assemblies and the two crank connecting rod assemblies are each positioned adjacent to one of the two mounting plates. Specifically, the left-side parallelogram connecting rod assembly and crank connecting rod assembly are positioned adjacent to the left-side mounting plate, while the right-side parallelogram connecting rod assembly and crank connecting rod assembly are positioned adjacent to the right-side mounting plate. This symmetrical arrangement ensures uniform force distribution, guarantees synchronous left-right translation of the movable smoke plate 212, improves motion accuracy, and avoids obstructing the main air duct space of the air inlet box 21.

[0043] The drive motor 32 can be installed in the mounting chamber on the left or right side. For example, the drive motor 32 is installed in the left mounting chamber, and its output shaft 321 is connected to the left end of the linkage 27. The output shaft 321 of the drive motor 32, the linkage 27, and the transmission crank 261 on the left side are connected by a limiting fit structure to ensure the synchronicity and accuracy of torque transmission.

[0044] See Figures 3-5Specifically, the first end of the transmission crank 261 has a mounting hole 2610. The output shaft 321 of the drive motor 32 has a first limiting mating surface 3211 arranged along its axial direction (for example, the cross-section of the output shaft 321 is D-shaped, and its planar portion constitutes the first limiting mating surface 3211). The corresponding end of the linkage 27 has a slot 270 for the output shaft 321 of the drive motor 32 to be inserted therein, and the slot 270 defines a second limiting mating surface 271 that abuts and fits against the first limiting mating surface 3211 (for example, the slot 270 is a D-shaped slot, and its planar portion constitutes the second limiting mating surface 271). After the output shaft 321 of the drive motor 32 is inserted into the slot 270 of the linkage 27, a combined mounting shaft portion is formed. This combined mounting shaft portion passes through the mounting hole 2610 of the transmission crank 261 and forms a limit with the transmission crank 261 in the circumferential direction of the combined mounting shaft portion.

[0045] Furthermore, after the combined mounting shaft passes through the mounting hole 2610 of the transmission crank 261, the combined mounting shaft is fixed to the transmission crank 261 by radially arranged fasteners (such as screws or pins) to ensure a firm connection.

[0046] Furthermore, a third limiting mating surface 272 extending axially is formed on the outer wall surface of the corresponding end of the linkage 27 (for example, the outer wall of the end of the linkage 27 is D-shaped, and its planar portion constitutes the third limiting mating surface 272). A fourth limiting mating surface 2613 is formed on the inner wall of the mounting hole 2610 at the first end of the transmission crank 261, which abuts and fits against the third limiting mating surface 272 (for example, the mounting hole 2610 is a D-shaped hole, and its planar portion constitutes the fourth limiting mating surface 2613). Through the mutual abutment and fit of the first limiting mating surface 3211, the second limiting mating surface 271, the third limiting mating surface 272, and the fourth limiting mating surface 2613, circumferential limiting is achieved, torque is effectively transmitted, and slippage and loosening caused by misalignment or unbalanced force during assembly are prevented.

[0047] In this embodiment, the first limiting mating surface 3211, the second limiting mating surface 271, the third limiting mating surface 272 and the fourth limiting mating surface 2613 are all planes, which are easy to process and fit, and reduce costs.

[0048] See also Figure 3 and Figure 4In this embodiment, the first end of the transmission crank 261 includes two opposing connecting wall plates 2611 and a fixed wall plate 2612 connected between the two connecting wall plates 2611, forming a stable frame structure. Each of the two connecting wall plates 2611 has mounting holes 2610. The assembled mounting shaft (consisting of the output shaft 321 of the drive motor 32 and the end of the linkage rod 27) passes through the two mounting holes 2610, thereby enhancing the rigidity and torsional resistance of the transmission crank 261.

[0049] The mounting holes 2610 on the two connecting wall plates 2611 extend to the position where they meet the fixed wall plate 2612, so that the corresponding part of the fixed wall plate 2612 constitutes the fourth limiting mating surface 2613 of the mounting holes 2610. This design increases the mating contact area, simplifies the structure, and improves the reliability and accuracy of the limiting.

[0050] The slot 270 on the linkage 27 is an open slot with an opening on the side, and the opening of the open slot is opposite to the second limiting mating surface 271. This allows the output shaft 321 of the drive motor 32 to be inserted laterally into the slot 270 of the linkage 27, simplifying the assembly process, improving assembly efficiency, and facilitating maintenance.

[0051] The part of the output shaft 321 of the drive motor 32 that is fixedly connected to the linkage rod 27 is also connected to the first end of the transmission crank 261 of the corresponding crank-connecting rod assembly. That is, the output shaft 321 of the drive motor 32 directly drives the linkage rod 27 and the transmission crank 261 simultaneously, which simplifies the structure and improves the directness of transmission and overall rigidity.

[0052] Each parallelogram linkage mechanism 25 includes two parallel first cranks 251. The first ends of the two first cranks 251 are hinged to the air inlet box 21 (specifically, the mounting plate 31 inside the air inlet box). The second ends of the two first cranks 251 are hinged to a connecting frame 252, which is fixedly connected to the panel bracket 2121 on the back of the movable panel 212.

[0053] In this embodiment, the driving force transmission path of the smoke plate motion mechanism is as follows: the torque of the output shaft 321 of the drive motor 32 is first transmitted to the linkage 27, and then transmitted through the linkage 27 to the transmission cranks 261 on both sides of the external connection. This transmission method can prevent the transmission cranks 261 on the driving side from deforming under force, causing the non-driving side to lag in motion, and ensure motion synchronization.

[0054] The output shaft 321 of the drive motor 32, the linkage 27, and the transmission crank 261 are connected by a multi-sided limiting fit to prevent misalignment, increased internal rotational resistance, and reduced torque output caused by single-plane limiting or screw-based limiting during assembly. The connection between the transmission crank 261 and the linkage 27 is fixed by a three-sided limiting method through the shaft on both sides, which controls the clearance of the shaft hole and effectively prevents crank offset from increasing frictional resistance under unbalanced installation or force conditions, and also prevents the risk of the fixing screws loosening due to crank slippage under force.

[0055] Overall, this utility model of a range hood effectively avoids obstruction of the core airflow channel by moving the drive motor 32 to an isolated mounting chamber on the side of the air inlet box 21, thus separating it from the main air inlet duct. This significantly reduces wind resistance and pressure loss, and improves smoke extraction efficiency. Simultaneously, the isolation design keeps the drive motor 32 away from areas of concentrated high-temperature smoke, reducing oil adhesion, preventing mechanism jamming and increased motor load, ensuring smooth operation, and extending component lifespan. The synchronous drive of two parallelogram linkage assemblies via the linkage rod 27 achieves smooth translation of the movable smoke plate 212, enhancing the overall reliability and performance stability of the machine.

Claims

1. A smoke plate moving mechanism for a range hood, comprising: Movable smoke plate (212); Two parallelogram linkage assemblies are arranged at intervals along the length of the movable smoke plate (212), and the movable smoke plate (212) is connected to the free ends of the two parallelogram linkage assemblies. The linkage rod (27) is rotatably mounted on the corresponding part of the range hood so as to be able to rotate around its own axis; The feature is that it further includes a drive motor (32), the output shaft (321) of the drive motor (32) is connected to the linkage rod (27) and drives the linkage rod (27) to rotate. The linkage rod (27) is connected to the two parallelogram linkage assemblies through a crank-connecting rod assembly, so that the rotational torque of the linkage rod (27) is transmitted to the two parallelogram linkage assemblies through the corresponding crank-connecting rod assembly to drive the movable smoke plate (212) to translate.

2. The smoke plate moving mechanism for a range hood according to claim 1, characterized in that: The crank-connecting rod assembly includes a transmission crank (261) and a transmission connecting rod (262). The first end of the transmission crank (261) is fixedly connected to the linkage rod (27). The second end of the transmission crank (261) is hinged to the first end of the transmission connecting rod (262). The second end of the transmission connecting rod (262) is hinged to the corresponding connecting rod of the parallelogram connecting rod assembly.

3. The smoke plate moving mechanism for a range hood according to claim 2, characterized in that: The part of the drive shaft of the drive motor (32) that is fixedly connected to the linkage rod (27) is also connected to the first end of the transmission crank (261) of the corresponding crank-connecting rod assembly.

4. The smoke plate moving mechanism for a range hood according to claim 3, characterized in that: The first end of the transmission crank (261) is provided with a mounting hole (2610). The output shaft (321) of the drive motor (32) has a first limiting mating surface (3211) arranged along its axial direction. The corresponding end of the linkage rod (27) has a slot (270) for the output shaft (321) of the drive motor (32) to be inserted therein. The slot (270) defines a second limiting mating surface (271) that is abutted and adapted to the first limiting mating surface (3211). When the output shaft (321) of the drive motor (32) is inserted into the slot (270) of the linkage rod (27), a combined mounting shaft is formed. The combined mounting shaft can pass through the mounting hole (2610) of the transmission crank (261) and form a limit with the transmission crank (261) in the circumferential direction of the combined mounting shaft.

5. The smoke plate moving mechanism for a range hood according to claim 4, characterized in that: The combined mounting shaft can be inserted through the mounting hole (2610) of the transmission crank (261) and then fixed to the transmission crank (261) by radially arranged fasteners.

6. The smoke plate moving mechanism for a range hood according to claim 4, characterized in that: A third limiting mating surface (272) extending axially is formed on the outer wall surface of the corresponding end of the linkage rod (27), and a fourth limiting mating surface (2613) that abuts and matches the third limiting mating surface (272) is formed on the inner wall of the first end mounting hole (2610) of the transmission crank (261).

7. The smoke plate moving mechanism for a range hood according to claim 6, characterized in that: The first limiting mating surface (3211), the second limiting mating surface (271), the third limiting mating surface (272) and the fourth limiting mating surface (2613) are all planes.

8. The smoke plate moving mechanism for a range hood according to claim 6, characterized in that: The slot (270) on the linkage rod (27) is an open slot with an opening on the side, and the opening of the open slot is opposite to the second limiting mating surface (271).

9. The smoke plate moving mechanism for a range hood according to claim 6, characterized in that: The first end of the transmission crank (261) includes two oppositely arranged connecting wall plates (2611) and a fixed wall plate (2612) connected between the two connecting wall plates (2611). The two connecting wall plates (2611) are provided with the mounting channels (2610), and the combined mounting shaft passes through the two mounting channels (2610).

10. The smoke plate moving mechanism for a range hood according to claim 9, characterized in that: The mounting holes (2610) on the two connecting wall panels (2611) extend to a position where they meet the fixed wall panel (2612), such that the corresponding portion of the fixed wall panel (2612) constitutes the fourth limiting mating surface (2613) of the mounting holes (2610).

11. The smoke plate moving mechanism for a range hood according to any one of claims 1 to 10, characterized in that: The back of the movable smoke plate (212) is provided with a smoke plate support (2121), and the parallelogram connecting rod assembly includes two first cranks (251) arranged in parallel, the free ends of which are hinged to the smoke plate support (2121).

12. A range hood, comprising an air inlet box (21) and a smoke plate moving mechanism, characterized in that: The aforementioned smoke plate movement mechanism adopts the smoke plate movement mechanism for a range hood according to any one of claims 1 to 11. An air inlet (210) is provided at the front of the air inlet box (21). The movable smoke plate (212) can move relative to the air inlet box (21) in a translational manner, thereby opening and closing the air inlet (210). When the movable smoke plate (212) opens the air inlet (210), the movable smoke plate (212) is located in front of and above the air inlet (210) and is generally attached to the front side of the air inlet box (21).

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