Method for controlling opening and closing angle of smoke collecting plate of range hood and range hood

Abstract

The present invention discloses a method for controlling the opening and closing angle of a smoke collecting plate of a range hood and the range hood, comprising the following steps: starting a push rod motor to drive the smoke collecting plate to rotate; collecting the operating current of the push rod motor; determining whether the operating current reaches a set current threshold; if so, determining that the push rod motor drives the smoke collecting plate to rotate to an opening and closing angle corresponding to the set current threshold, and shutting down the push rod motor. The opening and closing angle of the present invention corresponds to the set current threshold, and the opening and closing angle of the smoke collecting plate is determined by collecting the operating current of the push rod motor, thereby simply achieving positioning of the smoke collecting plate at different opening and closing angles. The present invention is applicable to the technical field of range hoods.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to a method for controlling the opening and closing angle of a smoke collecting plate of a range hood and the range hood. Background Art

[0002] A range hood with a smoke collecting plate opening and closing function, when the range hood is turned on to operate the fan, will open the smoke collecting plate to a certain angle through a push rod mechanism, so as to facilitate the oil smoke to be sucked into the air duct and discharged outside the kitchen. When the range hood is not in operation, the smoke collecting plate is closed to make the range hood more beautiful in appearance and prevent foreign objects such as mosquitoes from entering the range hood. The solution of the prior art is generally to connect the smoke collecting plate of the smoke collecting transmission mechanism to the rotating drum. When cleaning, the prior art solution requires the entire smoke collecting plate to be removed before the smoke collecting chamber can be cleaned. If the prior art needs to realize different opening and closing angles of the smoke collecting plate, it is usually necessary to design one or more travel switches in the opening and closing structure to realize this function. The design of the structure and circuit will be relatively complex and the cost will be relatively high. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for controlling the opening and closing angle of the smoke collecting plate of a range hood and a range hood, so as to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] To achieve the above object, according to one aspect of the present invention, a method for controlling the opening and closing angle of a smoke collecting plate of a range hood is provided, the method comprising the following steps:

[0005] Start the push rod motor to drive the smoke collecting plate to rotate;

[0006] collecting the operating current of the push rod motor;

[0007] Detecting whether the operating current reaches a corresponding set current threshold;

[0008] If so, it is determined that the push rod motor drives the cigarette collecting plate to rotate to the opening and closing angle corresponding to the set current threshold, and the push rod motor is stopped.

[0009] Furthermore, before starting the push rod motor to drive the smoke collecting plate to rotate, the following steps are also included:

[0010] Preset mode options and current thresholds corresponding to the mode options;

[0011] Determine the mode option selected by the user;

[0012] A corresponding current threshold is determined according to the mode option as the set current threshold.

[0013] Furthermore, starting the push rod motor to drive the cigarette collecting plate to rotate includes:

[0014] Determine the direction of the motor according to the mode option and the current state;

[0015] The push rod motor is started to rotate according to the determined push rod motor direction to drive the cigarette collecting plate to rotate.

[0016] Furthermore, the mode options include a cleaning mode, a normal mode, and an off mode, and the opening and closing angle of the cigarette collecting plate corresponding to the cleaning mode is greater than the opening and closing angle of the cigarette collecting plate corresponding to the normal mode.

[0017] Furthermore, the range hood includes a range hood housing, an eccentric wheel, a damping device and a smoke collecting plate. The smoke collecting plate is rotatably arranged on the range hood housing, the damping device is arranged on the range hood housing, the eccentric wheel is arranged on the smoke collecting plate and is arranged opposite to the damping device, and the eccentric wheel is used to press the damping device during the opening and closing process of the smoke collecting plate.

[0018] Another aspect of the present invention provides a range hood, comprising: a smoke collecting plate, a push rod motor, a controller, a motor drive circuit and an acquisition circuit; the push rod motor is driven and connected to the smoke collecting plate; the motor drive circuit and the acquisition circuit are respectively connected to the push rod motor; the controller is connected to the motor drive circuit and the acquisition circuit; the controller drives the push rod motor to rotate forward or reverse through the motor drive circuit; the controller acquires the working current of the push rod motor through the acquisition circuit; the controller is used to control the motor drive circuit to turn off the push rod motor when the working current of the push rod motor reaches a set current threshold, and the push rod motor is used to drive the opening and closing of the smoke collecting plate.

[0019] Furthermore, it also includes a range hood housing, an eccentric wheel and a damping device. The smoke collecting plate is rotatably arranged on the range hood housing, the damping device is arranged on the range hood housing, the eccentric wheel is arranged on the smoke collecting plate and is arranged opposite to the damping device, and the eccentric wheel is used to press the damping device during the opening and closing process of the smoke collecting plate.

[0020] Furthermore, the motor drive circuit includes a motor power supply, a first switching circuit, a second switching circuit, a first relay and a second relay. The first switching circuit and the second switching circuit are both provided with a first switch terminal, a second switch terminal and a controlled terminal. The first relay and the second relay are both provided with a first power supply end, a second power supply end, a switch fixed end, a first switch free end and a second switch free end. The two power supply terminals of the push rod motor are respectively connected to the switch fixed ends of the first relay and the second relay. The motor power supply is connected to the first switch free end and the first power supply end. The first switch terminal of the first switching circuit is connected to the second power supply end of the first relay. The first switch terminal of the second switching circuit is connected to the second power supply end of the second relay. The second switch terminal is grounded. The first control port of the controller is connected to the controlled terminal of the first switching circuit. The second control port of the controller is connected to the controlled terminal of the second switching circuit. The second switch free end of the first relay is connected to the second switch free end of the second relay, and is connected to the acquisition circuit. The motor drive circuit also includes a capacitor and a second resistor. The capacitor and the second resistor are connected in series between the two power supply terminals of the push rod motor.

[0021] Furthermore, the acquisition circuit includes a first resistor; the acquisition port of the controller is connected to one end of the first resistor, one end of the first resistor is also connected to the second switch free end of the first relay and the second switch free end of the second relay, and the other end of the first resistor is grounded.

[0022] Furthermore, the greater the opening and closing angle of the smoke collecting plate is, the greater the degree of compression of the damping device is.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] Since the cigarette collecting plate is in different positions when the push rod motor pushes it, the force applied to the push rod motor is different, resulting in different working currents of the push rod motor. Therefore, the opening and closing angles of the present invention correspond to the set current threshold. By collecting the working current of the push rod motor to determine the opening and closing angles of the cigarette collecting plate, the positioning of the cigarette collecting plate at different opening and closing angles can be simply achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other features of the present invention will become more apparent through a detailed description of the embodiments shown in conjunction with the accompanying drawings. In the drawings of the present invention, the same reference numerals represent the same or similar elements. Obviously, the drawings described below are only some embodiments of the present invention. It is possible for a person skilled in the art to derive other drawings based on these drawings without inventive effort. In the drawings:

[0026] Figure 1 Shown is a flow chart of a method for controlling the opening and closing angle of a smoke collecting plate of a range hood;

[0027] Figure 2 Shown is a structural diagram of a range hood with a smoke collecting plate opening and closing structure;

[0028] Figure 3 The figure shows the effect of the eccentric wheel acting on the damping device when the smoke collecting plate is in the closed state;

[0029] Figure 4 The figure shows the effect of the eccentric wheel acting on the damping device when the smoke collecting plate is opened and closed to the angle A1;

[0030] Figure 5 The figure shows the effect of the eccentric wheel acting on the damping device when the smoke collecting plate is opened and closed to the angle A2.

[0031] Figure 6 Shown is the circuit diagram of the motor drive circuit. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict.

[0033] Figure 1 A method for controlling the opening and closing angle of a smoke collecting plate of a range hood provided by an embodiment of the present invention specifically comprises the following steps:

[0034] S101, starting the push rod motor to drive the smoke collecting plate to rotate;

[0035] S102, collecting the operating current of the push rod motor;

[0036] S103, determining whether the operating current reaches a set current threshold;

[0037] If yes, go to step S104; if no, go to step S103.

[0038] S104: Determine that the push rod motor drives the cigarette collecting plate to rotate to an opening and closing angle corresponding to the set current threshold, and turn off the push rod motor.

[0039] Specifically, a pre-set correspondence between a set current threshold and the opening and closing angle of the smoke collecting plate is stored in the range hood. Since the smoke collecting plate is in different positions, the force applied to the push rod motor is different, resulting in different working currents of the push rod motor, that is, the working current of the push rod motor has a corresponding relationship with the opening and closing angle. Therefore, by detecting the working current of the push rod motor and comparing the working current with the set current threshold, the smoke collecting plate can be positioned at different opening and closing angles.

[0040] In one embodiment, a number of opening and closing angles can be set according to actual needs, and a number of set current thresholds can be set accordingly.

[0041] In one embodiment, before starting the push rod motor, a set current threshold needs to be determined from several set current thresholds. The set current threshold can be determined by determining the mode option selected by the user and starting the push rod motor. The set current threshold can also be determined by sensing the oil smoke condition through a sensor, and the set current threshold is determined according to the oil smoke condition to automatically start the push rod motor.

[0042] In one embodiment, when the set current threshold is determined by determining the mode option selected by the user, the following steps are further included before step S101:

[0043] S201, presetting a mode option and a current threshold corresponding to the mode option;

[0044] S202, determining the mode option selected by the user;

[0045] S203 : Determine a corresponding current threshold according to the mode option as the set current threshold.

[0046] Specifically, the correspondence between mode options and current thresholds is stored in the range hood. The mode options include cleaning mode, normal mode and off mode. The opening and closing angle of the smoke collecting plate corresponding to the cleaning mode is greater than the opening and closing angle of the smoke collecting plate corresponding to the normal mode. When the user selects the mode option, the corresponding set current threshold can be determined, and then the opening and closing angle of the smoke collecting plate can be determined.

[0047] For example, when the normal mode is selected, the corresponding set current threshold is C1, and the opening and closing angle of the cigarette holding plate is A1; when the cleaning mode is selected, the corresponding set current threshold is C2, and the opening and closing angle of the cigarette holding plate is A2, where A2>A1 and C2>C1; when the closed mode is selected, the corresponding set current threshold is Cmax, and the opening and closing angle of the cigarette holding plate is the initial angle (i.e., the cigarette holding plate is in the initial position). Since the cigarette holding plate is stuck when it returns to the initial position, the push rod motor continues to rotate to drive the cigarette holding plate, and the operating current of the push rod motor will increase. Therefore, when the operating current is greater than or equal to Cmax, it is considered that the cigarette holding plate has reached the initial position, where Cmax>C2, and Cmax represents the current when the cigarette holding plate is closed and stuck. In one embodiment, the initial position is the position of the cigarette holding plate when it is closed.

[0048] Furthermore, step S101 includes:

[0049] S301, determining the motor direction according to the mode option and the current state;

[0050] S302: Start the push rod motor to rotate according to the determined push rod motor direction, so as to drive the cigarette collecting plate to rotate.

[0051] Since the mode option may increase or decrease the opening and closing angle of the smoke collecting plate compared to the current state, the motor rotation direction needs to be determined first to control the rotation direction of the smoke collecting plate.

[0052] Specifically, the steering of the push rod motor includes forward steering and reverse steering. When steering forward, the opening and closing angle of the cigarette collecting plate gradually increases, and the working current of the push rod motor gradually increases. When steering reversely, before the cigarette collecting plate reaches the locking position, the opening and closing angle of the cigarette collecting plate gradually decreases, and the working current of the push rod motor gradually decreases.

[0053] Furthermore, judging whether the operating current reaches the set current threshold in step S103 specifically means that the operating current is greater than or equal to the set current threshold, or the operating current is less than or equal to the set current threshold, which is determined by the mode option and the current state.

[0054] Specifically, the opening and closing angle of the cigarette collecting plate is the initial angle (i.e. the current state). When the normal mode is selected, the current threshold is set to C1, the motor is determined to rotate forward, the cigarette collecting plate rotates clockwise, and the opening and closing angle gradually increases. When it is detected that the working current of the push rod motor is greater than or equal to C1, it means that the cigarette collecting plate is opened to the A1 angle and the push rod motor is turned off.

[0055] The opening and closing angle of the cigarette collecting plate is the initial angle (i.e. the current state). When the cleaning mode is selected, the current threshold is set to C2, the motor is determined to rotate forward, the cigarette collecting plate rotates clockwise, and the opening and closing angle gradually increases. When it is detected that the working current of the push rod motor is greater than or equal to C2, it means that the cigarette collecting plate is opened to the A2 angle and the push rod motor is turned off.

[0056] The opening and closing angle of the cigarette collecting plate is A1 (that is, the current state is normal mode). When the cleaning mode is selected, the current threshold is set to C2, the motor is determined to rotate forward, the cigarette collecting plate rotates clockwise, and the opening and closing angle gradually increases. When it is detected that the working current of the push rod motor is greater than or equal to C2, it means that the cigarette collecting plate is opened to A2 angle and the push rod motor is turned off.

[0057] The opening and closing angle of the cigarette collecting plate is A1 (that is, the current state is normal mode). When the closing mode is selected, the current threshold is set to Cmax, the motor is determined to reverse, the cigarette collecting plate rotates counterclockwise, and the opening and closing angle gradually decreases. When it is detected that the working current of the push rod motor is greater than or equal to Cmax, it means that the cigarette collecting plate has reached the initial position and the push rod motor is turned off.

[0058] The opening and closing angle of the cigarette collecting plate is A2 (that is, the current state is cleaning mode). When the normal mode is selected, the current threshold is set to C1, the motor is determined to reverse, the cigarette collecting plate rotates counterclockwise, and the opening and closing angle gradually decreases. When it is detected that the working current of the push rod motor is less than or equal to C1, it means that the cigarette collecting plate is opened to the A1 angle and the push rod motor is turned off.

[0059] The opening and closing angle of the cigarette collecting plate is A2 (that is, the current state is cleaning mode). When the closing mode is selected, the current threshold is set to Cmax, the motor is determined to reverse, the cigarette collecting plate rotates counterclockwise, and the opening and closing angle gradually decreases. When it is detected that the working current of the push rod motor is greater than or equal to Cmax, it means that the cigarette collecting plate has reached the initial position and the push rod motor is turned off.

[0060] Furthermore, in step S202, it is determined that the mode option selected by the user is specifically:

[0061] When the range hood has four buttons, namely, a power button, a power button, a normal mode button, and a cleaning button, after pressing the power button to turn on the range hood, normal mode, cleaning mode, and off mode can be selected by pressing the normal mode button, cleaning button, and power button respectively.

[0062] Alternatively, when the range hood has three buttons, namely the power button, the normal mode button, and the cleaning button, press the power button to turn it on. When it is on, press the power button again to confirm the selection of the off mode. When it is on, press the normal mode button and the cleaning button respectively to select the normal mode and the cleaning mode.

[0063] Alternatively, when the range hood has two buttons, namely the power button and the cleaning button, when the range hood is not working, pressing the power button determines that the normal mode is selected; when the range hood is in normal mode, pressing the power button determines that the off mode is selected; when the range hood is in normal mode, pressing the cleaning button determines that the cleaning mode is selected, and pressing the cleaning button again determines that the normal mode is selected; when the range hood is not working, pressing the cleaning button determines that the cleaning mode is selected, and pressing the cleaning button again determines that the off mode is selected.

[0064] It should be noted that the above-mentioned buttons can be physical buttons or virtual buttons, and pressing the buttons is achieved by touching.

[0065] Figure 2 This is a structural diagram of a range hood with a smoke collecting plate opening and closing structure provided by an embodiment of the present invention. Figure 3 This is a diagram showing the effect of the eccentric wheel acting on the damping device when the cigarette collecting plate is in the closed state according to an embodiment of the present invention. Figure 4 This is a diagram showing the effect of the eccentric wheel acting on the damping device when the smoke collecting plate provided by the embodiment of the present invention is opened and closed to the angle A1. Figure 5This diagram shows the effect of the eccentric wheel acting on the damping device when the smoke collecting plate is opened and closed to angle A2, according to an embodiment of the present invention. The range hood comprises a hood housing, a damping device 10, an eccentric wheel 20, and a smoke collecting plate 30. The smoke collecting plate 30 is rotatably mounted on the hood housing. The damping device 10 is mounted on the hood housing. The eccentric wheel 20 is mounted on the smoke collecting plate 30 and is positioned opposite the damping device 10. The eccentric wheel 20 is used to contact and press the damping device 10 during the opening and closing of the smoke collecting plate.

[0066] Furthermore, the eccentric wheel 20 is provided on the rotating shaft of the smoke collecting plate 30. When the smoke collecting plate 30 rotates, it can drive the eccentric wheel 10 to rotate. When the eccentric wheel 20 rotates, the pressure acting on the damping device 10 changes dynamically.

[0067] In one embodiment, the damping device 10 is a spring damping device. The greater the opening and closing angle of the smoke collecting plate, the greater the degree of compression of the damping device. When the smoke collecting plate of the range hood is closed, the spring resistance is minimum. If the push rod motor drives the smoke collecting plate to expand at this time, the load of the push rod motor is minimum, and the working current value of the push rod motor detected at this time is minimum. When the range hood is operating normally and the smoke collecting plate needs to be opened and closed to angle A1, the effect of the eccentric wheel on the spring damping device increases, the spring resistance increases, and the working current increases to C1. When the range hood is in cleaning mode and the smoke collecting plate needs to be opened and closed to angle A2, the spring resistance is maximum, and the working current increases to C2. The setting of the eccentric wheel can dynamically increase the load of the push rod motor, so that the working current of the push rod motor varies within a large range, so that the working current of the push rod motor corresponding to different opening and closing angles can have a large difference. The entire control system is not easily interfered with, the positioning of the opening and closing angle is relatively accurate, and the requirements for the relevant devices for collecting and detecting current are also relatively low.

[0068] On the other hand, the present invention also provides a range hood, including: a smoke collecting plate 30, a push rod motor, a controller, a motor drive circuit and an acquisition circuit; the push rod motor is driven and connected to the smoke collecting plate 30; the motor drive circuit and the acquisition circuit are respectively connected to the push rod motor; the controller is respectively connected to the motor drive circuit and the acquisition circuit; the controller drives the push rod motor to rotate forward or reverse through the motor drive circuit; the controller acquires the working current of the push rod motor through the acquisition circuit; the controller is used to control the motor drive circuit to turn off the push rod motor when the working current of the push rod motor reaches a set current threshold, and the push rod motor is used to drive the opening and closing of the smoke collecting plate 30.

[0069] In one embodiment, the range hood further comprises a range hood housing, an eccentric wheel 20, and a damping device 10. The smoke collecting plate 30 is rotatably mounted on the range hood housing. The damping device 10 is mounted on the range hood housing. The eccentric wheel 20 is mounted on the smoke collecting plate 30 and is disposed opposite to the damping device 10. The eccentric wheel 20 is configured to contact and press the damping device 10 during the opening and closing of the smoke collecting plate 30. The greater the opening and closing angle of the smoke collecting plate, the greater the degree of compression of the damping device 10.

[0070] Figure 6 : This is a circuit diagram of a motor drive circuit provided by an embodiment of the present invention, including a motor power supply 12V, a first switch circuit Q1, a second switch circuit Q2, a first relay RLY1, and a second relay RLY2. The first switch circuit Q1 and the second switch circuit Q2 are each provided with a first switch terminal, a second switch terminal, and a controlled terminal. The first relay RLY1 and the second relay RLY2 are each provided with a first power supply terminal (hereinafter referred to as the second terminal), a second power supply terminal (hereinafter referred to as the fifth terminal), a first switch fixed terminal (hereinafter referred to as the first terminal), a first switch free terminal (hereinafter referred to as the third terminal), and a second switch free terminal (hereinafter referred to as the fourth terminal).

[0071] The two power terminals of the push rod motor MT are connected to the first terminal of RLY1 and the first terminal of RLY2 respectively. The motor power supply 12V is connected to the third terminal of RLY1, the third terminal of RLY2, the second terminal of RLY1, and the second terminal of RLY2 respectively. The first switch terminal of Q1 is connected to the fifth terminal of RLY1, the first switch terminal of Q2 is connected to the fifth terminal of RLY2, and the second switch terminal of Q1 and the second switch terminal of Q2 are both grounded; the fourth terminal of RLY1 is connected to the fourth terminal of RLY2, and is also connected to the acquisition circuit;

[0072] The first control port (RLY_H) of the controller is connected to the controlled terminal of Q1, the second control port (RLY_L) of the controller is connected to the controlled terminal of Q2, and the second switch terminal of Q1 and the second switch terminal of Q2 are both grounded;

[0073] The motor drive circuit further includes a capacitor C1 and a second resistor R2 , which are connected in series between two power terminals of the push rod motor MT.

[0074] Furthermore, the acquisition circuit includes a resistor R1, the acquisition port (ADC) of the controller is connected to one end of the resistor R1, one end of the resistor R1 is respectively connected to the 4th end of RLY1 and the 4th end of RLY2, and the other end of the resistor R1 is connected to the ground.

[0075] Furthermore, the motor drive circuit further includes a resistor R3 and a resistor R4. The first control port (RLY_H) of the controller is connected to the controlled terminal of Q1 through the resistor R3. The second control port (RLY_L) of the controller is connected to the controlled terminal of Q2 through the resistor R4.

[0076] Furthermore, the first switch circuit Q1 and the second switch circuit Q2 both include NPN transistors, the first switch terminal refers to the collector, the second switch terminal refers to the emitter, and the controlled terminal refers to the base.

[0077] Furthermore, the controller is a general-purpose MCU.

[0078] The specific principle is as follows: The controller controls the first relay RLY1 and the second relay RLY2 by controlling the output levels of RLY_H and RLY_L, thereby controlling the forward and reverse rotation of the actuator motor. When the controller determines that the actuator motor is rotating forward, RLY_H outputs a high level, RLY_L outputs a low level, Q1 turns on, current flows through terminals 2 and 5 of RLY1, terminals 3 and 1 of RLY1 turn on, Q2 turns off, terminals 1 and 4 of RLY2 turn on, the motor drive circuit outputs a forward voltage, and the actuator motor rotates forward. When the controller determines that the actuator motor is rotating reversely, RLY_H outputs a low level, RLY_L outputs a high level, Q1 turns off, terminals 1 and 4 of RLY1 turn on, Q2 turns on, current flows through terminals 2 and 5 of RLY2, terminals 1 and 3 of RLY2 turn on, the motor drive circuit outputs a reverse voltage, and the actuator motor rotates reversely. The controller obtains the actuator motor's current in real time through the acquisition circuit.

[0079] The present invention corresponds to a set current threshold value for the opening and closing angle, and by collecting the operating current of the push rod motor to determine the opening and closing angle of the cigarette collecting plate, the cigarette collecting plate can be easily positioned at different opening and closing angles. The design is simple and the cost is low. Furthermore, by providing an eccentric wheel and a damping device, the load on the push rod motor can be dynamically increased, causing the operating current of the push rod motor to vary within a wide range. This allows for significant differences in the operating current of the push rod motor corresponding to different opening and closing angles. The entire control system is less susceptible to interference, the positioning of the opening and closing angle is relatively accurate, and the requirements for related devices for collecting and detecting current are relatively low.

[0080] Although the present invention has been described in considerable detail and with particularity with respect to several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but rather should be construed as providing a broad possible interpretation of these claims in view of the prior art by reference to the appended claims, thereby effectively encompassing the intended scope of the invention. In addition, the invention has been described above in terms of embodiments foreseen by the inventors for the purpose of providing a useful description, and those insubstantial modifications of the invention that are not currently foreseen may still represent equivalent modifications of the invention.

Claims

1. A method for controlling the opening and closing angle of a smoke collecting plate of a range hood, characterized in that: The following steps are involved: Start the push rod motor to drive the smoke collecting plate to rotate; collecting the operating current of the push rod motor; Determining whether the operating current reaches a set current threshold; If so, determining that the push rod motor drives the cigarette collecting plate to rotate to the opening and closing angle corresponding to the set current threshold, and turning off the push rod motor; Before starting the push rod motor to drive the cigarette collecting plate to rotate, the method further includes the following steps: presetting a mode option and a current threshold corresponding to the mode option; determining the mode option selected by the user; and determining the corresponding current threshold as the set current threshold according to the mode option; The step of starting the push rod motor to drive the cigarette collecting plate to rotate comprises: determining a direction of the push rod motor according to the mode option and the current state; and starting the push rod motor to rotate according to the determined direction of the push rod motor to drive the cigarette collecting plate to rotate. The range hood comprises a range hood housing, an eccentric wheel (20), a damping device (10) and a smoke collecting plate (30); the smoke collecting plate (30) is rotatably mounted on the range hood housing; the damping device (10) is mounted on the range hood housing; the eccentric wheel is mounted on the smoke collecting plate (30) and is arranged opposite to the damping device (10); the eccentric wheel (20) is used to contact and press the damping device (10) during the opening and closing process of the smoke collecting plate (30); The greater the opening and closing angle of the smoke collecting plate, the greater the degree of compression of the damping device; The mode options include a cleaning mode, a normal mode and an off mode. The opening and closing angle of the cigarette collecting plate corresponding to the cleaning mode is greater than the opening and closing angle of the cigarette collecting plate corresponding to the normal mode.

2. A range hood, characterized in that: The invention comprises: a cigarette collecting plate (30), a push rod motor, a controller, a motor drive circuit and a collection circuit; the push rod motor is connected to the cigarette collecting plate (30); the motor drive circuit and the collection circuit are respectively connected to the push rod motor; the controller is connected to the motor drive circuit and the collection circuit; the controller drives the push rod motor to rotate forward or reverse through the motor drive circuit; the controller collects the working current of the push rod motor through the collection circuit; the controller is used to control the motor drive circuit to turn off the push rod motor when the working current of the push rod motor reaches a set current threshold, and the push rod motor is used to drive the opening and closing of the cigarette collecting plate (30).

3. The range hood according to claim 2, characterized in that: It also includes a range hood housing, an eccentric wheel and a damping device. The smoke collecting plate is rotatably arranged on the range hood housing. The damping device is arranged on the range hood housing. The eccentric wheel is arranged on the smoke collecting plate and is arranged opposite to the damping device. The eccentric wheel is used to press the damping device during the opening and closing process of the smoke collecting plate.

4. The range hood according to claim 2, characterized in that: The motor drive circuit includes a motor power supply, a first switch circuit (Q1), a second switch circuit (Q2), a first relay (RLY1) and a second relay (RLY2). The first switch circuit (Q1) and the second switch circuit (Q2) are both provided with a first switch terminal, a second switch terminal and a controlled terminal. The first relay (RLY1) and the second relay (RLY2) are both provided with a first power supply end, a second power supply end, a switch fixed end, a first switch free end and a second switch free end. The two power supply terminals of the push rod motor (MT) are respectively connected to the switch fixed ends of the first relay (RLY1) and the second relay (RLY2). The motor power supply is connected to the first switch free end and the first power supply end. The first The switch terminal is connected to the second power supply terminal of the first relay (RLY1), the first switch terminal of the second switch circuit (Q2) is connected to the second power supply terminal of the second relay (RLY2), and the second switch terminal is grounded. The first control port of the controller is connected to the controlled terminal of the first switch circuit (Q1), the second control port of the controller is connected to the controlled terminal of the second switch circuit (Q2), the second switch free end of the first relay (RLY1) is connected to the second switch free end of the second relay (RLY2), and is connected to the acquisition circuit; the motor drive circuit also includes a capacitor (C1) and a second resistor (R2), and the capacitor (C1) and the second resistor (R2) are connected in series between the two power supply terminals of the push rod motor (MT).

5. The range hood according to claim 4, characterized in that: The acquisition circuit comprises a first resistor (R1); an acquisition port of the controller is connected to one end of the first resistor (R1); one end of the first resistor (R1) is also connected to the second switch free end of the first relay (RLY1) and the second switch free end of the second relay (RLY2); and the other end of the first resistor (R1) is grounded.

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