A kind of deflector device capable of automatically adjusting height and control method thereof

Abstract

The present invention discloses a deflector device capable of automatically adjusting the height and a control method thereof, the device comprising: a top deflector, a hinge, a lifting device, a supporting buffer, and an integrated detection controller; the hinge is installed at the top end of the top deflector and is used for being hinged to the top of a vehicle body; the axis centerline direction of the rotating shaft of the top deflector is parallel to the width direction of the top of the vehicle body; the lifting device is arranged at a position close to the rear end of the top deflector and is connected to the top of the vehicle body; one end of the supporting buffer is connected to the top deflector, and the other end is connected to the top of the vehicle body; the integrated detection controller is installed at the rear end of the top deflector, electrically connected to the lifting device, and is used for lifting and lowering the lifting device according to the received detection signal; the present invention can automatically adjust the top deflector to an adaptive height according to the height of the roof of the rear compartment of a commercial vehicle, has high adaptability and convenience, and can effectively reduce wind resistance, thereby improving fuel economy.

Description

Technical Field

[0001] The invention relates to a deflector device, in particular to a deflector device capable of automatically adjusting height and a control method. Background Art

[0002] In the operation of commercial vehicles, air resistance significantly affects their fuel economy, especially when driving at high speeds. Air resistance increases with vehicle speed, consuming engine power and leading to increased fuel consumption. To address this problem, the top deflector came into being. It is installed on the top of the commercial vehicle and guides the airflow to flow smoothly through the vehicle body by optimizing the airflow path, effectively reducing air vortices and turbulence, and thus reducing the drag coefficient.

[0003] The drag coefficient is an indicator of the air resistance of a vehicle. Its reduction means less air resistance, and under the same conditions, less fuel consumption. After being equipped with a top deflector, the drag coefficient of commercial vehicles is significantly reduced, and fuel economy is improved, especially when driving at high speeds. Therefore, the top deflector is an effective means to reduce the operating costs of commercial vehicles and improve fuel economy.

[0004] However, existing top deflectors are generally fixed or adjustable. The height of a fixed top deflector is fixed and cannot be adjusted according to the height of the roof of the rear compartment of a commercial vehicle. It has poor adaptability and cannot ensure that the height of the rear edge of the top deflector is relatively consistent with the height of the roof of the rear compartment, thereby failing to effectively reduce wind resistance. An adjustable top deflector is generally manually adjustable, and the height of the top deflector requires manual operation, which is less convenient. Summary of the invention

[0005] The object of the present invention is to provide a deflector device with automatically adjustable height and a control method. By using the deflector device with automatically adjustable height of the present invention, the top deflector can be automatically adjusted to an adaptive height according to the height of the roof of the rear compartment of a commercial vehicle. The deflector has high adaptability and convenience, and can effectively reduce wind resistance, thereby improving fuel economy.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a deflector device with automatically adjustable height, comprising: a top deflector, a hinge, a lifting device, a support buffer, and an integrated detection controller; the hinge is installed at the top end of the top deflector, and is used to be hinged with the top of the vehicle body; the axis centerline direction of the rotation axis of the top deflector is parallel to the width direction of the top of the vehicle body; the lifting device is arranged at a position close to the rear end of the top deflector and is connected to the top of the vehicle body; one end of the support buffer is connected to the top deflector, and the other end is connected to the top of the vehicle body; the integrated detection controller is installed at the rear end of the top deflector, and is electrically connected to the lifting device, and is used to control the lifting of the lifting device according to the received detection signal.

[0007] Optionally, the lifting device includes a first mounting seat, a lifting rod, a second mounting seat and a driving member; the first mounting seat is fixed on the top air duct and is rotatably connected to one end of the lifting rod; the driving member includes a motor and a gear connected to the motor output shaft; the motor is mounted on the second mounting seat, and the direction of the motor output shaft is perpendicular to the lifting rod; the second mounting seat is fixedly connected to the top of the vehicle body, and is provided with a limit slot matched with the lifting rod, and the limit slot is sleeved on the lifting rod; the lifting rod is provided with a tooth plate matched with the gear, and when the motor drives the gear to rotate, the tooth plate engages with the gear, thereby driving the lifting rod to move up and down.

[0008] Optionally, the first mounting seat is rotatably connected to one end of the lifting rod via an axle pin.

[0009] Optionally, the upper and lower ends of the tooth plate are both limit points of the tooth plate. When the gear runs to the limit point, the tooth plate and the gear are limited and locked, and the motor self-locks and stops rotating.

[0010] Optionally, the material of the limit slot is polyformaldehyde.

[0011] Optionally, the supporting buffer members of the lifting device are arranged adjacent to each other and are equal in number.

[0012] Optionally, the lifting force of the supporting buffer matches the gravity of the top fairing.

[0013] Optionally, the supporting buffer member is a gas spring or a hydraulic cylinder.

[0014] Optionally, the integrated detection controller includes a detector and a controller connected to the detector; the detector is used to detect the roof of the rear compartment and generate a detection signal; the controller is electrically connected to the lifting device, for receiving the detection signal and controlling the lifting of the lifting device.

[0015] In a second aspect, the present invention provides a control method for a shroud device capable of automatically adjusting height as claimed in any one of claims 1 to 9, comprising: Acquiring a detection signal in real time, the detection signal being detection of the roof of the rear compartment or non-detection of the roof of the rear compartment; When the initial detection signal is that the roof of the rear compartment is detected, the motor of the control driving member rotates forward, and the gear and the toothed plate cooperate to drive the tail end of the top air deflector to rise, until the detection signal is that the roof of the rear compartment is not detected, and the control motor stops working; if the detection signal is that the roof of the rear compartment is not detected, the tail end of the top air deflector rises to the highest point, the gear and the toothed plate are locked, and the control motor stops working; When the initial detection signal shows that the roof of the rear compartment is not detected, the motor of the control drive is reversed, and the rear end of the top air duct is driven to descend through the cooperation of the gear and the toothed plate, until the detection signal shows that the roof of the rear compartment is detected, and the control motor stops working; if the detection signal shows that the roof of the rear compartment is detected all the time, the rear end of the top air duct drops to the lowest point, the gear and the toothed plate are locked in the limit position, and the control motor stops working.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a deflector device capable of automatically adjusting the height and a control method thereof, wherein the deflector device comprises: a top deflector, a hinge, a lifting device, a supporting buffer, and an integrated detection controller; the top deflector is hinged to the top of a vehicle body through the hinge, the lifting device and the supporting buffer are both connected to the top deflector and the top of the vehicle body, the integrated detection controller is installed at the rear end of the top deflector, and is electrically connected to the lifting device, and is used for lifting and lowering the lifting device according to a received detection signal; by using the deflector device capable of automatically adjusting the height of the present invention, the top deflector can be automatically adjusted to an adaptive height according to the height of the roof of the rear compartment of a commercial vehicle, the adaptability is high, the convenience is high, and the wind resistance can be effectively reduced, thereby improving fuel economy.

[0017] The present invention provides a matching between the lifting force of the supporting buffer member in the air deflector device and the gravity of the top air deflector, that is, ensuring that the lifting force of the supporting buffer member is consistent with the pressure exerted on the lifting device by the top air deflector when assembled on the top of the vehicle body, so that during the lifting and lowering process of the top air deflector, the load on the motor is small, effectively improving the normal working life cycle of the motor.

[0018] The limit card slot in the air deflector device provided by the present invention is made of polyoxymethylene (POM) material, which has good self-lubricating performance and can effectively reduce the friction resistance between the lifting rod and the limit card slot during the lifting process; The lifting device in the deflector device provided by the present invention cooperates with the gear of the driving member through the toothed plate of the lifting rod, thereby driving the lifting rod to move up and down, and has good lifting stability and high precision, as well as high transmission efficiency and low power loss.

[0019] The motor in the air deflector device provided by the present invention has a self-locking function. When the motor drives the gear to run to the limit point of the tooth plate, and when the controller of the integrated detection controller sends a stop signal, the motor will self-lock and stop rotating, thereby preventing the top air deflector from shaking up and down.

[0020] The present invention provides a control method for a deflector device capable of automatically adjusting the height. A detector feeds back a detection signal to a controller, and the controller controls the forward rotation / reverse rotation / stop of a motor of a lifting device according to the detection signal, thereby realizing automatic height adjustment of the deflector device, thereby effectively reducing wind resistance and improving fuel economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a schematic structural diagram of a deflector device capable of automatically adjusting the height in one embodiment of the present invention; FIG2 (a) is a perspective structural diagram of a lifting device A in one embodiment of the present invention; FIG2( b ) is a perspective structural diagram of a lifting device B in an embodiment of the present invention; Figure 3 The figure shows a schematic diagram of a deflector device installed on the top of a vehicle body in one embodiment of the present invention; Figure 4 Shown Figure 3 A magnified schematic diagram of the local c in the middle; Figure 5 The figure is a schematic flow chart of a control method of a shroud device in one embodiment of the present invention; In the figure: 1. top air deflector; 2. hinge; 3. lifting device; 4. gas spring; 5. integrated detection controller; 31. first mounting seat; 311. first mounting plate 311; 312. rib plate; 313. second mounting plate; 32. lifting rod; 321. tooth plate; 33. pin shaft; 34. second mounting seat; 341. middle plate; 342. side plate; 35. limit slot; 36. motor; 361. gear. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may also include different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0024] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] Example 1

[0026] like Figure 1-Figure 4 As shown, an embodiment of the present invention introduces a deflector device that can automatically adjust the height, including: a top deflector 1, a hinge, a lifting device 3, a supporting buffer, and an integrated detection controller 5; the hinge is installed at the top of the top deflector 1, and is used to be hinged with the top of the vehicle body; the axis centerline direction of the rotation axis of the top deflector 1 is parallel to the width direction of the top of the vehicle body; the lifting device 3 is arranged at a position close to the rear end of the top deflector 1 and is connected to the top of the vehicle body; one end of the supporting buffer is connected to the top deflector 1, and the other end is connected to the top of the vehicle body; the integrated detection controller 5 is installed at the rear end of the top deflector, and is electrically connected to the lifting device 3, and is used to control the lifting and lowering of the lifting device 3 according to the received detection signal.

[0027] like Figure 1 As shown, in the present embodiment, the integrated detection controller 5 is arranged in the middle part of the rear end of the top air deflector 1, and the number of the lifting devices 3 is two, which are arranged on both sides of the integrated detection controller 5. Compared with the air deflector device with one lifting device 3, the lifting stability of the rear end of the top air deflector 1 is better; the top air deflector 1 is also provided with a mounting part compatible with the lifting device 3, so that when the air deflector device is installed, the fixation between the top air deflector 1 and the lifting device 3 is more convenient.

[0028] Specifically, in this embodiment, the hinged member is a hinge 2, which is used to hinge the top fairing 1 and the top of the vehicle body.

[0029] In this embodiment, as shown in Figures 2 (a) and 2 (b), the lifting device 3 includes a first mounting seat 31, a lifting rod 32, a second mounting seat 34 and a driving member; the first mounting seat 31 is fixed on the top air duct 1 and is rotatably connected to one end of the lifting rod 32; the driving member includes a motor 36 and a gear 361 connected to the output shaft of the motor 36; the motor 36 is mounted on the second mounting seat 34, and the direction of the output shaft of the motor 36 is perpendicular to the lifting rod 32; the second mounting seat 34 is fixedly connected to the top of the vehicle body, and is provided with a limit slot 35 adapted to the lifting rod 32, and the limit slot 35 is sleeved on the lifting rod 32; the lifting rod 32 is provided with a tooth plate 321 adapted to the gear 361, and when the motor 36 drives the gear to rotate, the tooth plate 321 engages with the gear 361, thereby driving the lifting rod 32 to move up and down.

[0030] Specifically, the first mounting seat 31 includes a first mounting plate 311, a rib plate 312 and a second mounting plate 313; the first mounting plate 311 is provided with three mounting holes, which are used to be fixed with the mounting parts arranged on the top air duct 1 by bolts, so as to realize the fixation of the lifting device 3 and the top air duct 1; the number of the first mounting plates 311 is two, and they are vertically arranged on the first mounting plates 311 through the rib plates 312; there is an appropriate distance between the two first mounting plates 311 to accommodate the lifting rod 32, and the first mounting plate 311 is provided with a pin shaft hole, which is used to be rotatably connected with the lifting rod 32 through the pin shaft 33, and the first mounting seat 31 and the lifting rod 32 can rotate relative to each other around the shaft pin 33.

[0031] The gear 361 is engaged with the toothed plate 321, and the motor 36 rotates to drive the gear 361 to rotate. The gear 361 is engaged with the toothed plate 321, and the lifting rod 32 can be driven up and down. The lifting rod 32 can be controlled to rise or fall by the forward and reverse rotation of the motor 36. The upper and lower ends of the toothed plate 321 are the limit points of the gear 361. When the gear 361 runs to the upper limit point of the toothed plate 321, the top air guide cover 1 rises to the highest position, the gear 361 and the toothed plate 321 are locked in a limit position, and the motor 36 is self-locking and stops rotating. When the gear 361 runs to the lower limit point of the toothed plate 321, the top air guide cover 1 drops to the lowest position, the gear 361 and the toothed plate 321 are locked in a limit position, and the motor 36 is self-locking and stops rotating.

[0032] Specifically, the second mounting base 34 includes an intermediate plate 341 and a side plate 342; the intermediate plate 341 is provided with a hole adapted to the driving member, the driving member is fixed to the intermediate plate 341 by bolts, and the output shaft direction of the driving member is perpendicular to the lifting rod 32; two side plates 342 are provided on both sides of the intermediate plate 341, and a connecting plate for fixing to the top of the vehicle body is provided at the bottom end of the side plate 342; wherein, the intermediate plate 341 is also fixed with a limiting slot 35, the limiting slot 35 clamps and limits the lifting rod 32, and can limit the lifting rod 32 to only be able to move up and down, and prevent the tooth plate 321 from being disengaged from the gear 361; the limiting slot 35 is made of polyoxymethylene (POM), has good self-lubricating properties, and can effectively reduce the friction resistance between the lifting rod 32 and the limiting slot 35 during the lifting process.

[0033] like Figure 3-Figure 4 As shown, in this embodiment, the supporting buffers of the lifting device 3 are arranged adjacently and in equal numbers; the lifting force of the supporting buffers matches the gravity of the top air deflector 1. Specifically, in this embodiment, the supporting buffer is a gas spring 4, and the upper and lower mounting seats of the gas spring 4 are respectively assembled to the top air deflector 1 and the top of the vehicle body by bolts. Among them, the lifting force of the gas spring 4 matches the gravity of the top air deflector 1, ensuring that the lifting force of the gas spring 4 is consistent with the pressure of the top air deflector 1 on the lifting device 3, thereby ensuring that the load of the motor 36 is small during the lifting and lowering process of the top air deflector 1, effectively improving the normal working life cycle of the motor 36.

[0034] In this embodiment, the integrated detection controller 5 includes a detector and a controller connected to the detector; the detector is used to detect the roof of the rear compartment and generate a detection signal; the controller is electrically connected to the lifting device, and is used to receive the detection signal and perform forward / reverse rotation of the motor in the lifting device 3 to perform lifting and lowering control of the rear end of the top deflector 1; Example 2

[0035] The embodiment of the present invention introduces an assembly method of the air deflector device capable of automatically adjusting the height as described in Embodiment 1, comprising: A top air deflector 1, an articulated member, a lifting device 3, a supporting buffer member, and an integrated detection controller 5; the articulated member is installed at the top end of the top air deflector 1 and is used to be hinged with the top of the vehicle body; the axis of the rotation axis of the top air deflector 1 is parallel to the width direction of the top of the vehicle body; the lifting device 3 is arranged at a position close to the rear end of the top air deflector 1 and is connected to the top of the vehicle body; one end of the supporting buffer member is connected to the top air deflector 1, and the other end is connected to the top of the vehicle body; the integrated detection controller 5 is installed at the rear end of the top air deflector, and is electrically connected to the lifting device 3, and is used to control the lifting of the lifting device 3 according to the received detection signal. First, place the top fairing 1 on the top of the vehicle body, with the axis of its rotation axis parallel to the width direction of the top of the vehicle body; Then, one end of the hinge 2 is assembled on the top of the top fairing 1 and the other end is assembled on the top of the vehicle body by bolts, so that the top fairing 1 is rotatably connected to the top of the vehicle body and can rotate with the axis of the hinge 2 as the rotation axis; Secondly, the integrated detection controller 5 is assembled on the top air deflector 1 by bolts; and the upper and lower mounting seats of the gas spring 4 are assembled on the top air deflector 1 and the top of the vehicle body respectively by bolts.

[0036] Finally, the first mounting seat 31 of the lifting device 3 is assembled on the top fairing 1 by means of bolts; and the second mounting seat 34 of the lifting device 3 is assembled on the top of the vehicle body by means of bolts.

[0037] Example 3

[0038] like Figure 5 As shown, the embodiment of the present invention introduces a control method of the air deflector device capable of automatically adjusting the height as described in Embodiment 1, comprising: Acquiring a detection signal in real time, the detection signal being detection of the roof of the rear compartment or non-detection of the roof of the rear compartment; When the initial detection signal is that the roof of the rear compartment is detected, the motor of the control driving member rotates forward, and the gear and the toothed plate cooperate to drive the tail end of the top air deflector to rise, until the detection signal is that the roof of the rear compartment is not detected, and the control motor stops working; if the detection signal is that the roof of the rear compartment is not detected, the tail end of the top air deflector rises to the highest point, the gear and the toothed plate are locked, and the control motor stops working; When the initial detection signal shows that the roof of the rear compartment is not detected, the motor of the control drive is reversed, and the rear end of the top air duct is driven to descend through the cooperation of the gear and the toothed plate, until the detection signal shows that the roof of the rear compartment is detected, and the control motor stops working; if the detection signal shows that the roof of the rear compartment is detected all the time, the rear end of the top air duct drops to the lowest point, the gear and the toothed plate are locked in the limit position, and the control motor stops working.

[0039] In this embodiment, the detector performs detection in real time and transmits the detection signal to the controller; the controller receives the detection signal in real time and controls the motor according to the detection signal, as follows: When the initial detection signal is that the roof of the rear compartment is detected, the control motor rotates forward, so that the gear and the toothed plate cooperate to drive the lifting rod to rise, and the tail end of the top air deflector rises, until the detection signal is that the roof of the rear compartment is not detected, and the control motor stops working; in the process of the control motor rotating forward so that the tail end of the top air deflector continues to rise, if the roof of the rear compartment is not detected, the tail end of the top air deflector rises to the highest point, the gear and the toothed plate are locked, and the control motor stops working; When the initial detection signal is that the roof of the rear compartment is not detected, the control motor is reversed, so that the gear and the toothed plate cooperate to drive the lifting rod to descend, and the tail end of the top air deflector falls, until the detection signal is that the roof of the rear compartment is detected, and the control motor stops working; in the process of controlling the motor to reverse and the tail end of the top air deflector continues to fall, if the roof of the rear compartment is not detected, the tail end of the top air deflector falls to the lowest point, the gear and the toothed plate are locked in the limit position, and the control motor stops working.

[0040] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A deflector device capable of automatically adjusting height, characterized in that: include: A top air deflector, an articulated part, a lifting device, a supporting buffer part, and an integrated detection controller; the articulated part is installed at the top end of the top air deflector and is used to be hinged with the top of the vehicle body; the axis centerline direction of the rotating shaft of the top air deflector is parallel to the width direction of the top of the vehicle body; the lifting device is arranged at a position close to the rear end of the top air deflector and is connected to the top of the vehicle body; one end of the supporting buffer part is connected to the top air deflector, and the other end is connected to the top of the vehicle body; the integrated detection controller is installed at the rear end of the top air deflector, and is electrically connected to the lifting device, and is used to control the lifting of the lifting device according to the received detection signal.

2. The air deflector device capable of automatically adjusting height according to claim 1, characterized in that: The lifting device includes a first mounting seat, a lifting rod, a second mounting seat and a driving member; the first mounting seat is fixed on the top air duct and is rotatably connected to one end of the lifting rod; the driving member includes a motor and a gear connected to the motor output shaft; the motor is mounted on the second mounting seat, and the direction of the motor output shaft is perpendicular to the lifting rod; the second mounting seat is fixedly connected to the top of the vehicle body, and is provided with a limit slot matched with the lifting rod, and the limit slot is sleeved on the lifting rod; the lifting rod is provided with a tooth plate matched with the gear, and when the motor drives the gear to rotate, the tooth plate engages with the gear, thereby driving the lifting rod to move up and down.

3. The air deflector device capable of automatically adjusting height according to claim 2, characterized in that: The first mounting seat is rotatably connected to one end of the lifting rod through an axle pin.

4. The air deflector device capable of automatically adjusting height according to claim 2, characterized in that: The upper and lower ends of the tooth plate are both limit points of the tooth plate. When the gear runs to the limit point, the tooth plate and the gear are locked, and the motor is self-locked and stops rotating.

5. The air deflector device capable of automatically adjusting height according to claim 2, characterized in that: The material of the limit card slot is polyoxymethylene.

6. The air deflector device capable of automatically adjusting height according to claim 1, characterized in that: The supporting buffer members of the lifting device are arranged adjacent to each other and are equal in number.

7. The air deflector device capable of automatically adjusting height according to claim 1, characterized in that: The lifting force of the supporting buffer member matches the gravity of the top fairing.

8. The air deflector device capable of automatically adjusting height according to claim 1, characterized in that: The supporting buffer member is a gas spring or a hydraulic cylinder.

9. The air deflector device capable of automatically adjusting height according to claim 1, characterized in that: The integrated detection controller includes a detector and a controller connected to the detector; the detector is used to detect the roof of the rear compartment and generate a detection signal; the controller is electrically connected to the lifting device, used to receive the detection signal and perform lifting and lowering control on the lifting device.

10. A control method for the air deflector device capable of automatically adjusting height according to any one of claims 1 to 9, characterized in that: include: Acquiring a detection signal in real time, the detection signal being detection of the roof of the rear compartment or non-detection of the roof of the rear compartment; When the initial detection signal is that the roof of the rear compartment is detected, the motor of the control driving member rotates forward, and the gear and the toothed plate cooperate to drive the tail end of the top air deflector to rise, until the detection signal is that the roof of the rear compartment is not detected, and the control motor stops working; if the detection signal is that the roof of the rear compartment is not detected, the tail end of the top air deflector rises to the highest point, the gear and the toothed plate are locked, and the control motor stops working; When the initial detection signal shows that the roof of the rear compartment is not detected, the motor of the control drive is reversed, and the rear end of the top air duct is driven to descend through the cooperation of the gear and the toothed plate, until the detection signal shows that the roof of the rear compartment is detected, and the control motor stops working; if the detection signal shows that the roof of the rear compartment is detected all the time, the rear end of the top air duct drops to the lowest point, the gear and the toothed plate are locked in the limit position, and the control motor stops working.

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