Wireless induction anti-pinch energy-saving electric fume hood and control method thereof

Abstract

The application discloses a wireless induction anti-pinch energy-saving electric ventilation cabinet and a control method thereof, and belongs to the technical field of experimental equipment. The ventilation cabinet comprises a cabinet body, an electric door driven by a synchronous belt and a guide rail assembly. The infrared emission part and the infrared receiving part are arranged in the guide rail inside the cabinet body at the lower left and right sides of the electric door, and the two parts are respectively provided with a rechargeable battery and a wireless charging receiving end. The wireless charging emission end is arranged at the bottom of the left and right guide rails, and the battery is automatically charged wirelessly when the electric door is closed and returned to the original position. The cabinet control part receives the anti-pinch signal based on the heartbeat packet protocol, and when the infrared light beam is blocked or the heartbeat packet is timed out, the control part determines that the safety is abnormal and controls the electric door to stop descending and roll back upward. After returning to the original position and charging, the control part is linked to reduce the power of the air extractor. The application completely eliminates the hidden troubles of the anti-pinch cable blockage and breakage, has fault safety redundancy and non-inductive automatic cruising, and significantly reduces the exhaust resistance and heating energy consumption.

Description

Technical Field

[0001] This invention relates to the field of experimental equipment technology, and in particular to a wireless induction anti-pinch energy-saving electric fume hood and its control method. Background Technology

[0002] Fume hoods are critical safety devices in laboratories used to remove toxic, harmful, or corrosive gases or dust generated during experiments, protecting the personal safety of laboratory personnel. With the continuous improvement of laboratory automation and intelligence, traditional manually operated pull-out windows are gradually being replaced by motor-driven lifting doors (or motorized windows). Motorized doors offer rapid response and can be stopped and started at will, greatly improving the convenience of experimental operations.

[0003] To prevent electric fume hoods from pinching operators' arms or damaging experimental equipment on the worktable during automatic closing, anti-pinch sensors are typically installed at the bottom of the door. However, existing electric fume hoods have the following serious shortcomings in the implementation of anti-pinch sensing systems and overall flow channel structure: 1. Wired power supply and transmission lines are prone to jamming and breakage: Traditional anti-pinch sensors typically use wired connections. The signal and power lines that move with the electric door require protection via cable chains or spring-loaded telescopic cables. Due to the extremely confined space inside the fume hood guide rails and the presence of corrosive acids and alkalis in the laboratory environment, the cable chains or spring-loaded cables are highly susceptible to mechanical fatigue fracture after prolonged and frequent stretching and bending, or to jamming and snagging within the guide rail grooves. This not only obstructs the electric door's movement, causes abnormal noises, and may even damage the transmission mechanism, but also interrupts the anti-pinch signal transmission, creating a serious and potentially fatal safety hazard.

[0004] 2. Difficulties in wireless battery life and vulnerability of sensors: Simply replacing the anti-pinch sensor with a wireless battery-powered one eliminates the need for a cable chain, but requires frequent manual battery replacements, resulting in high maintenance costs. Once the battery is depleted and not detected in time, the anti-pinch function will completely fail. Furthermore, traditional sensors are typically exposed on the outside of the bottom of the electric door, making them highly susceptible to damage from splashes of acidic or alkaline liquids, chemical fumes, or physical impacts during testing.

[0005] 3. Insufficient wireless signal interference resistance and safety redundancy: Laboratory environments contain numerous sources of electromagnetic interference. Ordinary wireless anti-pinch systems cannot respond in a "fail-safe" manner when the signal is lost due to strong interference or when the battery suddenly fails. If wireless communication is interrupted during the descent of the electric gate, the control system may be unable to recognize obstacles and continue to press the gate down, posing a significant safety risk.

[0006] 4. High Internal Flow Resistance and High HVAC Energy Consumption: In traditional fume hood flow structures, the vertical and inclined guide vanes used to guide airflow within the hood are often connected at right-angled bends or hard angles. When airflow passes through corner areas, the drastic change in flow direction easily leads to boundary layer separation, generating a large amount of turbulence and vortex dead zones, significantly increasing the resistance within the exhaust duct and reducing airflow efficiency. To maintain a safe face velocity, the traditional approach is often to forcibly exhaust air by increasing fan power. This not only significantly increases fan power consumption but also causes a large amount of temperature-controlled air (air heated or cooled by air conditioning) to be rapidly drawn away and discharged outdoors, resulting in a surge in power consumption of the HVAC system used to maintain room temperature in the laboratory. Furthermore, traditional electric doors lack an efficient and low-power collaborative mechanism with the exhaust fan system after closing, making it impossible to further reduce exhaust energy consumption while ensuring safety. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a wireless induction anti-pinch energy-saving electric fume hood and its control method, in order to solve the technical problems of existing electric fume hoods, such as the cable of the anti-pinch sensor moving with the door being prone to jamming and breakage, the exposed sensor being susceptible to corrosion damage, the lack of fault safety redundancy and automatic battery recharge capability in wireless anti-pinch technology, the high internal flow resistance of the fume hood leading to low exhaust efficiency, and the lack of a door-machine coordinated energy-saving mechanism causing a sharp increase in the power consumption of laboratory HVAC systems and fans.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A wireless sensor anti-pinch energy-saving electric ventilation cabinet includes: a cabinet body, an operating table inside the cabinet body, a cabinet back panel at the rear of the cabinet body, an operating opening facing the operator on the front side of the cabinet body, and guide rails for guiding and fixing are vertically arranged on the left and right sides of the operating opening. A baffle assembly is disposed inside the cabinet and forms an efficient exhaust duct between itself and the back panel of the cabinet; An electric door system includes an electric door that is raised and lowered within the guide rail, a rack that is fixedly mounted on the electric door, and a power unit with gears mounted on the cabinet, wherein the gears mesh with the rack to drive the electric door to rise and fall along the guide rail; The wireless infrared anti-pinch component includes an infrared transmitter and an infrared receiver respectively disposed on the left and right sides of the lower end face of the electric door, and the infrared transmitter and the infrared receiver are respectively hidden inside the guide rails on both sides of the operating port. The infrared transmitter is equipped with a first rechargeable battery and a first wireless charging receiver. The infrared receiver is equipped with a second rechargeable battery, a second wireless charging receiver, a microprocessor, and a wireless signal transmitter. The wireless charging transmitter assembly includes two wireless charging transmitters respectively disposed at the lower limit positions of the bottom of the left and right guide rails; when the electric door descends to the lowest closed position, the two wireless charging transmitters are respectively coupled to the first wireless charging receiver and the second wireless charging receiver to wirelessly charge the first rechargeable battery and the second rechargeable battery respectively. The control unit is electrically connected to the power unit and communicates wirelessly with the wireless signal transmitter.

[0009] In a further configuration, the wireless signal transmitter is configured to continuously send heartbeat packets to the control unit at preset time intervals; During the downward closing process of the electric gate, if the infrared receiver does not receive the infrared beam emitted by the infrared transmitter, or if the control unit does not receive the heartbeat signal within a preset threshold time, the control unit determines that there is a safety abnormality, and controls the power unit to stop working and drives the gear to reverse a preset angle so that the electric gate stops descending and rolls back up a preset distance.

[0010] Furthermore, an elevated air guide wing is provided on the lower edge of the cabinet below the operating port, and an air passage is provided between the lower edge of the cabinet and the air guide wing; When the electric door descends to its lowest closed position, the lower end face of the electric door and the upper surface of the guide vane form a flow-blocking gap, and the external supply air is blown towards the high-efficiency exhaust duct through the air passage, flat against the operating table surface.

[0011] Further, the guide plate assembly includes a vertical guide plate disposed in front of the cabinet back panel and an inclined guide plate disposed above the vertical guide plate and inclined upward. The vertical guide plate and the inclined guide plate are connected by an arc-shaped connector. The inner and outer sides of the arc-shaped connector are both arc-shaped so that the intersection of the vertical guide plate and the inclined guide plate has an arc-shaped transition. The vertical guide plate and the inclined guide plate are respectively inserted into the arc-shaped connector to complete the fixed connection.

[0012] Further configuration: the vertical guide plate includes a lower vertical guide plate and an upper vertical guide plate; the distance between the lower vertical guide plate and the cabinet back panel is less than the distance between the upper vertical guide plate and the cabinet back panel; the upper vertical guide plate is inserted into the lower end of the arc-shaped connector.

[0013] Furthermore, a lower air inlet slot is provided between the lower vertical guide vane and the operating table surface; A central air inlet slot is provided between the lower vertical guide plate and the upper vertical guide plate; The inclined guide plate has two or more upper air inlet slots.

[0014] Furthermore, the arc-shaped connector has a cavity inside, and a light strip is installed inside the cavity. The light strip is configured to provide upward and oblique illumination to the work surface.

[0015] Furthermore, the cavity above the high-efficiency exhaust duct is a collection area, and an air-gathering hood is provided above the collection area. The slope and vertical surface of the air-gathering hood are transitioned by an arc surface.

[0016] A control method for a wireless sensor-based anti-pinch energy-saving electric fume hood includes the following steps: Step S1: The control unit receives the closing command and controls the power unit to drive the gear and rack to mesh, thereby driving the electric door to descend along the guide rail and close. Step S2: During the descent, the infrared transmitter and receiver hidden inside the guide rails on both sides perform cross-door beam detection. The microprocessor in the infrared receiver sends heartbeat packets with infrared status information to the control unit through the wireless signal transmitter. Step S3: The control unit determines whether any of the following triggering conditions are met: Condition A: The heartbeat signal indicates that the infrared beam is blocked; Condition B: The control unit has not received a heartbeat signal for more than a preset time threshold T. Step S4: If condition A or condition B is met, the control unit determines that there is a safety risk, immediately controls the power unit to brake and stop, and controls the power unit to rotate in the opposite direction, driving the electric door to roll upward a preset distance and then hover. Step S5: If neither condition A nor condition B is met, the electric door continues to descend until it is completely closed and reaches the lowest position. At this time, the wireless charging receivers on the left and right sides are coupled to the corresponding wireless charging transmitters, and the first and second rechargeable batteries are wirelessly charged simultaneously. After the microprocessor detects the start of charging, it sends a command to the control unit through the wireless signal transmitter. The control unit adjusts the power of the exhaust fan to maintain a high safety face velocity with extremely low exhaust volume.

[0017] This invention provides a wireless induction anti-pinch energy-saving electric fume hood and its control method by concealing infrared anti-pinch components with independent batteries and wireless charging receivers on both sides of the cabinet inside the guide rails on both sides, setting a wireless charging transmitter at the bottom of the guide rails, and combining wireless anti-pinch rollback control based on heartbeat packet protocol, an electric door system driven by gear and rack, and an energy-saving airflow structure including arc-shaped connectors, air passages, and low-power control of door motor linkage. This solves the problems of traditional electric fume hoods, such as easy jamming and breakage of anti-pinch cables, easy corrosion damage to sensors, lack of safety redundancy and automatic battery recharge capability in wireless transmission, and high exhaust resistance and high power consumption of HVAC system and fan. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the present invention (the direction of wind flow is indicated by arrows); Figure 2 for Figure 1 Enlarged view of area "A"; Figure 3 for Figure 1 Enlarged view of area "B"; Figure 4 for Figure 1 Enlarged view of area "C"; Figure 5 This is a diagram showing the connection relationships of the components of the infrared emitting part of the present invention; Figure 6 This is a diagram showing the connection relationships of the components of the infrared receiver of the present invention; In the diagram: Cabinet 1, Work surface 11, Cabinet back panel 12, Operating opening 13, Cabinet lower edge 14, Guide rail 15. Vertical guide vane 2, lower vertical guide vane 21, upper vertical guide vane 22, oblique guide vane 23, high-efficiency exhaust duct 24. Lower air inlet slot 31, middle air inlet slot 32, upper air inlet slot hole 33 4. Arc-shaped connector 41. Cavity 42. LED strip 43. 5. Air guide vane; 51. Air passage; 6. Air collection area; 7. Air gathering cover Electric door 8, rack 81, power unit 82, gear 83 Infrared transmitter 91, infrared receiver 92, wireless signal transmitter 93, first rechargeable battery 94a, second rechargeable battery 94b, first wireless charging receiver 95a, second wireless charging receiver 95b, wireless charging transmitter 96, microprocessor 97, control unit 10. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0022] According to the contents of the claim and specification, the specific implementation method is as follows: Example 1: Overall structure of fume hood and gear and rack drive electric door system Reference Figure 1 , Figure 4 The wireless sensor anti-pinch energy-saving electric fume hood provided in this embodiment has the following overall frame structure: The cabinet 1 has an operating table 11 at the bottom for the operator to work on. A cabinet back panel 12 is vertically installed at the rear of the cabinet 1. An operating opening 13 is provided on the front side of the cabinet 1 for the operator. Guide rails 15 are vertically fixed on the left and right sides of the operating opening 13. The guide rails 15 are used to guide the electric door 8 to rise and fall and to fix it laterally.

[0023] The electric door system includes an electric door 8 (i.e., a viewing glass door) that is lifted and recessed within guide rails 15 on both sides. A vertically extending rack 81 is fixedly installed on the side or rear wall of the electric door 8. A power unit 82 with a drive motor is fixedly installed on the upper part of the cabinet 1. A gear 83 is mounted on the output shaft of the power unit 82, and the gear 83 is precisely meshed with the rack 81 fixed on the electric door 8. When the power unit 82 receives a lifting command, it drives the gear 83 to rotate. Through the direct drive meshing transmission of "gear 83-rack 81", the electric door 8 is driven to smoothly and quickly rise and fall along the guide rails 15, and can stop and start as needed.

[0024] Example 2: High-efficiency energy-saving air guide plate assembly and exhaust channel design Reference Figure 1 , Figure 2 and Figure 3 The cabinet 1 is equipped with a baffle assembly, and a certain gap is left between the baffle assembly and the cabinet back panel 12 to form an efficient exhaust duct 24.

[0025] The deflector assembly includes a vertical deflector 2 positioned in front of the cabinet back panel 12 and an inclined deflector 23 positioned above the vertical deflector 2 and tilted towards the operator. The vertical deflector 2 is segmented, comprising a lower vertical deflector 21 and an upper vertical deflector 22. The vertical distance between the lower vertical deflector 21 and the cabinet back panel 12 is less than the vertical distance between the upper vertical deflector 22 and the cabinet back panel 12, in order to optimize the exhaust suction force through static pressure distribution.

[0026] The intersection of the upper vertical guide vane 22 and the inclined guide vane 23 is connected by a specially designed arc-shaped connector 4. For example... Figure 2 ( Figure 1 As shown in the enlarged view of area "A" (see figure), the inner side (facing the inside of the cabinet) and outer side (facing the high-efficiency exhaust duct 24) of the arc-shaped connector 4 are both arc-shaped. During assembly, the top of the upper vertical guide plate 22 is inserted upward into the lower groove of the arc-shaped connector 4, and the bottom of the inclined guide plate 23 is inserted downward into the upper groove of the arc-shaped connector 4. The double arc transition makes the transition area a smooth arc, which greatly suppresses boundary layer separation when the airflow passes through the corner, eliminates turbulence and vortex dead zones, and reduces the resistance in the exhaust duct.

[0027] The arc-shaped connector 4 has a hollow cavity 41 inside, and an LED light strip 42 is embedded in the cavity 41. The side of the arc-shaped connector 4 facing the work surface 11 has a light-transmitting opening, and the light emitted by the light strip 42 can illuminate the core operating area of ​​the work surface 11 from the upper side without shadows or glare.

[0028] Regarding the air inlet configuration: a lower air inlet slot 31 close to the table surface is provided between the lower vertical guide plate 21 and the operating table surface 11 to quickly draw away high-density, easily sinking heavy gases; a middle air inlet slot 32 is provided between the lower vertical guide plate 21 and the upper vertical guide plate 22, corresponding to the hand operating height; and multiple upper air inlet slots 33 are provided on the inclined guide plate 23 to capture the light gases that rise due to heat.

[0029] Reference Figure 1 and Figure 3 ( Figure 1 (Enlarged view of area "B") An elevated air guide wing 5 is fixedly installed at the lower edge 14 of the cabinet below the operating port 13. A gap is left between the lower edge 14 of the cabinet and the air guide wing 5 to form an air passage 51. When the electric door 8 is completely lowered to the lowest closed position, the lower end face of the electric door 8 and the upper surface of the air guide wing 5 maintain a minimal airflow obstruction gap. External supplementary air passes through the air passage 51 and blows flat against the operating table surface 11 towards the high-efficiency exhaust air duct 24, forming a horizontal air curtain barrier.

[0030] The cavity above the high-efficiency exhaust duct 24 is the air collection area 6. Above the air collection area 6 is the air gathering hood 7. The inclined surface of the air gathering hood 7 and the vertical connecting pipe surface are smoothly transitioned by an arc surface, which further reduces the resistance at the inlet of the exhaust duct.

[0031] Example 3: Concealed dual-sided wireless anti-pinch and wireless charging system for rails Reference Figure 1 , Figures 3 to 6 The anti-pinch sensor in this embodiment completely eliminates the need for cable chains and spring wires, achieving fully wireless operation and concealed track protection. The wireless infrared anti-pinch components are respectively set on the left and right sides of the lower end face of the electric door 8, and are completely hidden inside the groove cavity of the guide rail 15 on both sides of the operating port 13.

[0032] Inside the left guide rail (infrared transmitter): An infrared transmitter 91 is hidden, and the infrared transmitter 91 encapsulates a first rechargeable battery 94a and a first wireless charging receiver 95a.

[0033] Inside the right guide rail (infrared receiver): An infrared receiver 92 is hidden. The infrared receiver 92 encapsulates a second rechargeable battery 94b, a second wireless charging receiver 95b, a microprocessor 97, and a wireless signal transmitter 93.

[0034] Wireless charging terminals on the cabinet side: Two wireless charging transmitters 96 are fixedly installed at the bottom of the slots 15 on both the left and right sides (at the lower limit of the downward movement of the electric door 8). The wireless charging transmitters 96 are electrically connected to the main power supply of the cabinet 1.

[0035] When the electric door 8 is in the process of rising or falling, the first rechargeable battery 94a on the left powers the infrared transmitter 91, and the second rechargeable battery 94b on the right powers the infrared receiver 92, the microprocessor 97, and the wireless signal transmitter 93. There are no cross-door wirings required on the left and right sides, and there are no exposed cable trays between the electric door 8 and the cabinet 1.

[0036] When the electric door 8 is fully lowered and reaches the lowest closed position, the first wireless charging receiver 95a and the second wireless charging receiver 95b are electromagnetically coupled to the wireless charging transmitters 96 at the bottom of the left and right guide rails, respectively, and automatically wirelessly charge the first rechargeable battery 94a and the second rechargeable battery 94b, achieving seamless automatic battery life without manual maintenance.

[0037] The main control unit 10 is mounted on the cabinet 1. The main control unit 10 is electrically connected to the motor of the power unit 82 and conducts bidirectional wireless communication with the wireless signal transmitter 93 in the infrared receiver 92 through the built-in wireless communication module.

[0038] Example 4: Anti-pinch control and door operator coordinated energy-saving control method Reference Figures 1 to 6 This embodiment provides a highly reliable control method for anti-pinch and door operator coordinated energy saving based on the above-mentioned energy-saving electric fume hood. The specific control process steps are as follows: Step S1 (Downward Response): When the control unit 10 receives a command to close the window (e.g., a personnel departure sensor or a manual door closing button), the control unit 10 commands the power unit 82 to start, driving the gear 83 to rotate and mesh with the rack 81, thus driving the electric door 8 to smoothly descend and close along the guide rails 15 on both sides.

[0039] Step S2 (Cross-Door Detection and Heartbeat Transmission): During the downward movement of the electric door 8, the infrared transmitter 91, hidden in the left guide rail 15, transmits a modulated infrared beam across the door to the right, and the infrared receiver 92, hidden in the right guide rail 15, receives the beam in real time. The microprocessor 97 collects the on / off status of the beam in real time and, through the wireless signal transmitter 93, cyclically transmits a "heartbeat packet signal" containing infrared status information and device number to the control unit 10 on the cabinet side at preset time intervals (e.g., every 10ms).

[0040] Step S3 (Multi-condition safety judgment): The control unit 10 receives the heartbeat packet signal in real time and continuously judges whether any of the following trigger conditions are met: Condition A (Obstacle Obstruction): The data frame in the heartbeat packet signal clearly indicates that the cross-door infrared beam is obstructed by gloves, arms, or experimental equipment; Condition B (Communication / Power Abnormality): If the control unit 10 fails to receive a heartbeat packet signal for more than the preset time threshold T (e.g., T=30ms, meaning no heartbeat packet is received for 3 consecutive times), it is determined that the wireless signal is interrupted by strong interference or the battery is depleted.

[0041] Step S4 (Fail-safe Rollback): If either condition A or condition B is met, the control unit 10 will trigger the "fail-safe" protection mechanism and determine that there is a safety risk: immediately control the motor brake of the power unit 82 to stop, and within milliseconds control the power unit 82 to rotate in the opposite direction, driving the gear 83 to drive the rack 81 and electric door 8 to roll back and rise a preset distance (e.g., rebound and rise 5cm) and then hover. At the same time, the control unit 10 will issue an audible and visual warning to completely eliminate the risk of pinching personnel or damaging equipment.

[0042] Step S5 (Low power consumption reset and door operator energy saving linkage): If neither condition A nor condition B is met during the entire downward movement, the electric door 8 will smoothly descend to the lowest closed position.

[0043] At this time, the left and right wireless charging receivers (95a, 95b) at the bottom of the electric door 8 are aligned with the wireless charging transmitters 96 at the bottom of the guide rail, triggering high-efficiency wireless charging to replenish the batteries (94a, 94b).

[0044] After the microprocessor 97 detects the start of wireless charging by the voltage / current change at the receiver, it confirms that the electric door 8 has been safely returned to its original position and then sends a "returned to charging" command to the control unit 10 through the wireless signal transmitter 93.

[0045] Upon receiving the instruction, the control unit 10 automatically sends a frequency reduction and speed adjustment command to the laboratory fan system, lowering the operating power of the exhaust fan. At this time, with extremely low exhaust volume, thanks to the micro-slit flow barrier formed by the air passage 51 between the lower edge of the electric door 8 and the guide vane 5, as well as the low-resistance flow channel of the arc-shaped connector 4, the face velocity at the fume hood operating port 13 can still be precisely maintained in accordance with national safety standards (e.g., 0.5 m / s), significantly reducing the loss of controlled cold / hot air from the laboratory HVAC system and achieving excellent overall energy-saving effect.

[0046] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A wireless sensor-activated anti-pinch energy-saving electric fume hood, characterized in that, include: Cabinet (1), the cabinet (1) is provided with an operating table (11), the cabinet (1) is provided with a cabinet back panel (12) at the rear, the cabinet (1) is provided with an operating opening (13) facing the operator on the front side, and the operating opening (13) is provided with guide rails for guiding and fixing on the left and right sides. The baffle assembly is disposed inside the cabinet (1) and forms an efficient exhaust duct (24) between it and the cabinet back panel (12). The electric door system includes an electric door (8) that is lifted and lowered within the guide rail, a rack (81) fixedly mounted on the electric door (8), and a power unit (82) mounted on the cabinet (1) and equipped with a gear (83), wherein the gear (83) meshes with the rack (81) to drive the electric door (8) to lift and lower along the guide rail. The wireless infrared anti-pinch assembly includes an infrared transmitter (91) and an infrared receiver (92) respectively disposed on the left and right sides of the lower end face of the electric door (8). The infrared transmitter (91) and the infrared receiver (92) are respectively hidden inside the guide rails on both sides of the operating port (13). The infrared transmitter (91) is provided with a first rechargeable battery (94a) and a first wireless charging receiver (95a). The infrared receiver (92) includes a second rechargeable battery (94b), a second wireless charging receiver (95b), a microprocessor (97), and a wireless signal transmitter (93). The wireless charging transmitter assembly includes two wireless charging transmitters (96) respectively disposed at the lower limit positions of the bottom of the left and right guide rails; when the electric door (8) descends to the lowest closed position, the two wireless charging transmitters (96) are respectively coupled to the first wireless charging receiver (95a) and the second wireless charging receiver (95b) to wirelessly charge the first rechargeable battery (94a) and the second rechargeable battery (94b) respectively. The control unit (10) is electrically connected to the power unit (82) and communicates wirelessly with the wireless signal transmitter (93).

2. The wireless induction anti-pinch energy-saving electric fume hood according to claim 1, characterized in that: The wireless signal transmitter (93) is configured to continuously send heartbeat packets to the control unit (10) at preset time intervals; During the downward closing process of the electric door (8), if the infrared receiver (92) does not receive the infrared beam emitted by the infrared transmitter (91), or if the control unit (10) does not receive the heartbeat signal within a preset threshold time, the control unit (10) determines that there is a safety abnormality, and controls the power unit (82) to stop working and drives the gear (83) to reverse a preset angle so that the electric door (8) stops descending and rolls back up a preset distance.

3. The wireless induction anti-pinch energy-saving electric fume hood according to claim 1, characterized in that: An overhead air guide wing (5) is provided on the lower edge (14) of the cabinet (1) below the operation port (13), and an air passage (51) is provided between the lower edge (14) of the cabinet and the air guide wing (5). When the electric door (8) descends to the lowest closed position, the lower end face of the electric door (8) and the upper surface of the guide wing (5) form a flow-blocking gap, and the external supply air is blown towards the high-efficiency exhaust duct (24) through the air passage (51) and flat against the operating table surface (11).

4. The wireless induction anti-pinch energy-saving electric fume hood according to claim 1, characterized in that: The flow guide plate assembly includes a vertical flow guide plate (2) disposed in front of the cabinet back panel (12) and an inclined flow guide plate (23) disposed above the vertical flow guide plate (2) and inclined upward. The vertical guide plate (2) and the inclined guide plate (23) are connected by an arc-shaped connector (4). The inner and outer sides of the arc-shaped connector (4) are both arc-shaped so that the intersection of the vertical guide plate (2) and the inclined guide plate (23) is arc-shaped. The vertical guide plate (2) and the inclined guide plate (23) are respectively inserted into the arc-shaped connector (4) to complete the fixed connection.

5. A wireless induction anti-pinch energy-saving electric fume hood according to claim 4, characterized in that: The vertical guide plate (2) includes a lower vertical guide plate (21) and an upper vertical guide plate (22). The distance between the lower vertical guide plate (21) and the cabinet back panel (12) is less than the distance between the upper vertical guide plate (22) and the cabinet back panel (12). The upper vertical guide plate (22) is inserted into the lower end of the arc-shaped connector (4).

6. A wireless induction anti-pinch energy-saving electric fume hood according to claim 5, characterized in that: A lower air inlet slot (31) is provided between the lower vertical guide plate (21) and the operating table (11). A middle air inlet slot (32) is provided between the lower vertical guide plate (21) and the upper vertical guide plate (22). The inclined guide plate (23) has two or more upper air inlet slots (33).

7. A wireless induction anti-pinch energy-saving electric fume hood according to claim 4, characterized in that: The arc-shaped connector (4) has a cavity (41) inside, and a light strip (42) is provided inside the cavity (41). The light strip (42) is configured to provide upward lighting to the operating table (11).

8. The wireless induction anti-pinch energy-saving electric fume hood according to claim 1, characterized in that: The cavity above the high-efficiency exhaust duct (24) is the air collection area (6), and an air gathering hood (7) is provided above the air collection area (6). The slope and vertical surface of the air gathering hood (7) are connected by an arc transition.

9. A control method for a wireless induction anti-pinch energy-saving electric fume hood as described in claim 2, characterized in that, Includes the following steps: Step S1: The control unit (10) receives the closing command and controls the power unit (82) to drive the gear (83) to mesh with the rack (81), thereby driving the electric door (8) to descend and close along the guide rail; Step S2: During the descent, the infrared transmitter (91) and infrared receiver (92) hidden inside the guide rails on both sides perform cross-door beam detection. The microprocessor in the infrared receiver (92) sends heartbeat packets with infrared status information to the control unit (10) cyclically through the wireless signal transmitter (93). Step S3: The control unit (10) determines whether any of the following triggering conditions are met: Condition A: The heartbeat signal indicates that the infrared beam is blocked; Condition B: The control unit (10) has not received a heartbeat packet signal for more than a preset time threshold T; Step S4: If condition A or condition B is met, the control unit (10) determines that there is a safety risk, immediately controls the power unit (82) to brake and stop, and controls the power unit (82) to rotate in the opposite direction, driving the electric door (8) to roll upward a preset distance and then hover. Step S5: If neither condition A nor condition B is met, the electric door (8) continues to descend until it is completely closed and reaches the lowest position. At this time, the wireless charging receivers (95a, 95b) on the left and right sides are coupled to the corresponding wireless charging transmitters (96) to wirelessly charge the first rechargeable battery (94a) and the second rechargeable battery (94b) simultaneously. After the microprocessor (97) detects the start of charging, it sends a command to the control unit (10) through the wireless signal transmitter (93). The control unit (10) lowers the power of the exhaust fan so that a high safety face velocity can be maintained under extremely low exhaust volume.

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