Reflective scanning type object surface sterilization device

Abstract

The application belongs to the technical field of sterilization devices, and particularly relates to a reflection scanning type object surface sterilization device, which comprises a shell, a light source part, a mirror structure, a stepping motor, a main circuit board and a cooling fan, the light source part is arranged in the shell, the mirror structure is arranged on the light path direction of the light source part, the stepping motor is in transmission connection with the mirror structure, the main circuit board is in electric connection with the stepping motor, and the cooling fan is arranged on one side of the light source part. Through close arrangement of UVC-LED lamp beads, cooperation of the light reflection material made of Teflon material and the secondary optical design lens made of quartz glass material, the UVC light intensity can be higher and the distribution can be more uniform. Meanwhile, the ultraviolet intensity of the light source is accurately and controllably adjusted through the driving circuit, so that more flexible sterilization mode selection is realized.

Description

Technical Field

[0001] This invention belongs to the field of sterilization device technology, specifically relating to a reflective scanning surface sterilization device. Background Technology

[0002] Currently, there are two main technical solutions for using UVC-LED lamp beads to sterilize large-area surfaces: one is to lay a large number of UVC-LED lamp beads directly above the surface to achieve the preset sterilization effect; the other is to design the light source on a structure that can move in parallel or rotate around a certain axis, and use external power to make the UVC light source move back and forth directly above the sterilization target to achieve the purpose of scanning sterilization.

[0003] However, the drawbacks of large-area LED deployment are insufficient design flexibility, high cost, and uneven UVC irradiation on the target sterilization plane, resulting in inconsistent sterilization effects across the entire plane. The mechanically moving UVC light source scanning sterilization method requires a sliding track above the sterilization target, and because the light source needs to be moved, the power and size of the entire light source module cannot be increased significantly. Summary of the Invention

[0004] To address the inconsistent sterilization effects of large-area LED chip installations and the limitations of mechanically moving UVC light sources in terms of power, size, and overall light source module size for sterilization, this invention provides a reflective scanning surface sterilization device.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A reflective scanning surface sterilization device includes a housing, a light source, a reflector structure, a stepper motor, a main circuit board, and a cooling fan. The light source is disposed inside the housing, the reflector structure is disposed in the optical path direction of the light source, the stepper motor is drivenly connected to the reflector structure, the main circuit board is electrically connected to the stepper motor, and the cooling fan is disposed on one side of the light source.

[0006] The light source includes a light source panel, a Teflon focusing structure, a secondary optical lens, and a heat sink. The Teflon focusing structure is positioned in the optical path direction of the light source panel, the secondary optical lens is positioned in the optical path direction of the Teflon focusing structure, the reflector structure is positioned in the optical path direction of the secondary optical lens, and the heat sink is attached to the back of the light source panel.

[0007] The reflector structure includes a reflector, a first bearing, a second bearing, and a conveyor belt. The bottom of the reflector is connected to the housing via the first bearing, and the top of the reflector is provided with a second bearing, which is connected to a stepper motor via the conveyor belt.

[0008] The reflector is triangular prism-shaped and has three sides. The first side of the reflector is a smooth flat reflective surface, the second side of the reflector is a smooth arc reflective surface with a radius of 200mm, and the third side of the reflector is a smooth plane containing a light intensity sampling port at an angle of 45° to the horizontal plane.

[0009] The main circuit board includes a DC-DC power conversion circuit, a computing block circuit, a servo block circuit, and a constant current drive circuit. The DC-DC power conversion circuit is electrically connected to the computing block circuit, the servo block circuit, and the constant current drive circuit, respectively. The computing block circuit is electrically connected to the light source board through the constant current drive circuit, and the computing block circuit is electrically connected to the stepper motor through the servo block circuit.

[0010] The computing block circuit includes a radio frequency antenna unit, a USB data input unit, a SOC computing unit, a USB-to-TTL circuit unit, and an automatic download circuit. The radio frequency antenna unit is electrically connected to the SOC computing unit, the USB data input unit is electrically connected to the USB-to-TTL circuit unit, and the SOC computing unit is electrically connected to the automatic download circuit through the USB-to-TTL circuit unit.

[0011] The radio frequency antenna unit uses an AN9520 radio frequency antenna, the USB data input unit uses a TYPE-C16PIN interface, the SOC computing unit uses an ESP32-PICO-D4 chip, the USB to TTL circuit unit uses a CH340K interface chip, and the automatic download circuit includes a first transistor and a second transistor. The collector of the first transistor is electrically connected to the RTS pin of the USB to TTL circuit unit, and the collector of the second transistor is electrically connected to the DTR pin of the USB to TTL circuit unit.

[0012] The servo block circuit includes a stepper motor drive circuit and a magnetic encoder circuit, wherein the magnetic encoder circuit is electrically connected to the stepper motor through the stepper motor drive circuit.

[0013] The magnetic encoder circuit uses an AS5047U-HTST magnetic encoder, and the stepper motor drive circuit is impedance matched with the magnetic encoder circuit through a resistor.

[0014] The light source board consists of 28 UVC-LED beads. The constant current drive circuit adopts a 7-way control circuit. The 28 UVC-LED beads are connected in a 2-series-14-parallel configuration. Two adjacent parallel circuits share one control circuit. The control circuit uses an AO3400A field-effect transistor.

[0015] Compared with the prior art, the beneficial effects of this invention are: 1. When sterilizing large-area object surfaces, this invention significantly reduces the number of UVC-LED beads required, making it easier to achieve a compact design for the UVC sterilization module.

[0016] 2. Compared to large-area LED chip placement and parallel UVC light source movement, this invention achieves higher UVC light intensity and more uniform distribution through a dense arrangement of UVC-LED chips, combined with Teflon reflective material and a secondary optical design lens made of quartz glass. Simultaneously, the driving circuit allows for precise and controllable adjustment of the light source's UV intensity, enabling more flexible selection of sterilization modes.

[0017] 3. Traditional surface sterilization methods, when faced with situations requiring enhanced sterilization effects, typically only increase the UVC radiation intensity by increasing the current flowing through the UVC-LED. This invention, while maintaining this functionality, utilizes a smooth, 200mm radius circular reflective surface on the second side of the reflector structure to further concentrate the UVC ultraviolet light emitted from the light source, thereby increasing the UVC irradiation intensity of the irradiated surface.

[0018] 4. Compared to sterilization devices that use parallel moving light sources to directly irradiate the sterilization target, which require laying a slide rail above the target and are subject to many limiting factors, this invention is a reflective static scanning device. The entire device can be kept stationary to perform scanning sterilization on a large surface area, making it more flexible in application. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a structural schematic diagram of the present invention from another angle; Figure 3 This is an exploded view of the present invention; Figure 4 This is a schematic diagram of the structure of the reflector of the present invention; Figure 5 This is a schematic diagram of the light path reflected at a small angle during the operation of this invention; Figure 6 This is a schematic diagram of the light path reflected at a large angle during the operation of this invention; Figure 7 This is a circuit diagram of the DC-DC power conversion of the present invention; Figure 8 This is a constant current drive circuit diagram of the present invention; Figure 9 This is a circuit diagram of the radio frequency antenna unit of the present invention; Figure 10 This is a circuit diagram of the USB data input unit of the present invention; Figure 11 This is a circuit diagram of the SOC computing unit of the present invention; Figure 12 This is a circuit diagram of the USB to TTL circuit unit of the present invention; Figure 13 This invention automatically downloads circuit diagrams; Figure 14 This is a circuit diagram of the stepper motor drive of the present invention; Figure 15 This is a circuit diagram of the magnetic encoder of the present invention; Figure 16 This is the circuit diagram of the light source board of the present invention.

[0022] Wherein: 1 is the housing, 2 is the light source, 201 is the light source board, 202 is the Teflon focusing structure, 203 is the secondary optical lens, 204 is the heat sink, 3 is the reflector structure, 301 is the reflector, 3011 is the first side, 3012 is the second side, 3013 is the third side, 3014 is the light intensity sampling port, 302 is the first bearing, 303 is the second bearing, 304 is the conveyor belt, 4 is the stepper motor, 5 is the main circuit board, 501 is the DC-DC power conversion circuit, 502 is the constant current drive circuit, 5031 is the RF antenna unit, 5032 is the USB data input unit, 5033 is the SOC computing unit, 5034 is the USB to TTL circuit unit, 5035 is the automatic download circuit, Q8 is the first transistor, Q9 is the second transistor, 5041 is the stepper motor drive circuit, 5042 is the magnetic encoder, and 6 is the cooling fan. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. These descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the claims of the present invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] A reflective scanning surface sterilization device, such as Figure 1-3As shown, when powered on, the calculation block circuit on the main circuit board 5 sends a PWM control signal to the constant current drive circuit 502 according to a pre-set program, controlling the UVC-LED lamp beads to operate at the programmed brightness. The 28 UVC-LED lamp beads form a linear light-emitting surface, and the brightness of each position on this linear light-emitting surface can be independently adjusted by the signal given by the SOC calculation unit 5033. After the UVC-LED lamp beads are lit, most of the ultraviolet light propagates forward at a 30° angle, while the remaining portion is adjusted by the Teflon reflective structure 202 to propagate towards the opening of the housing 1. After the ultraviolet light reaches the secondary optical lens 203, it is refracted by the secondary optical lens 203, causing the light, which originally had a certain divergence angle, to be emitted in a parallel manner as much as possible, resulting in a collimated parallel ultraviolet light beam. The heat sink 204 dissipates the heat from the light source board 201, which is then dissipated outside the housing 1 by the cooling fan 6. Stepper motor 4 is controlled by the computing block circuit. Stepper motor 4 and reflector structure 3 are driven by transmission belt 304. After the light source part 2 emits approximately parallel linear UVC ultraviolet rays, reflector structure 3 rotates back and forth at a small angle with stepper motor 4, continuously changing the incident angle of UVC rays with the reflective side of reflector structure 3, and thus changing the exit angle. This creates a large-area reciprocating scanning effect on the sterilization target plane.

[0028] Furthermore, the preferred material for the reflector 301 is Teflon material (Teflon material has a UV reflectivity of ≥90% in the 270-280nm wavelength band), such as... Figure 4 As shown, the reflector 301 has a triangular prism shape. The first side 3011 is a smooth flat reflective surface, the second side 3012 is a smooth arc reflective surface with a radius of 200mm, and the third side 3013 includes a smooth plane with a light intensity sampling port 3014 at a 45° angle to the horizontal plane. After receiving parallel light from the light source, the first side 3011 reflects the light mirror-like surface, maintaining parallelism within a certain error range. The second side 3012, being concave, converges the parallel light emitted from the light source (at the center of the arc), and its reflection enhances the convergence of ultraviolet light. The light intensity sampling port 3014 on the third side 3013, utilizing its 45° angle to the horizontal plane, reflects ultraviolet light to the opening in the outer casing, enabling data sampling of ultraviolet light intensity and providing data support for intensity adjustment and lifespan detection.

[0029] Furthermore, the triangular prism-shaped reflector 301, made of Teflon material, mirror-reflects the parallel UVC band ultraviolet rays emitted by the light source. The first side surface 3011 of the reflector 301 is flat and can act as a mirror, altering its original propagation path. For example... Figure 5 , Figure 6As shown, through the transmission of the stepper motor 4 and the transmission belt 304, the incident angle between the parallel light emitted by the light source and the first side surface 3011 of the reflector 301 is continuously changed. Thus, by changing the reflection angle, the surface of the object to be sterilized is scanned and irradiated to achieve the purpose of sterilization.

[0030] Furthermore, such as Figure 7-16 As shown, the DC-DC power conversion circuit 501 is responsible for the power supply of the entire device, converting the fixed input voltage into a voltage that meets the needs of different components. The computing block circuit consists of an RF antenna unit 5031, a USB data input unit 5032, a SOC computing unit 5033, a USB-to-TTL circuit unit 5034, and an automatic download circuit 5035, responsible for the information calculation and processing, data reception and transmission of the entire device. The servo block circuit consists of a stepper motor drive circuit 5041 and a magnetic encoder circuit 5042, responsible for driving the stepper motor 4 to rotate precisely, and realizing precise control of the rotation of the reflector structure 3 through the transmission belt 304. The light source block consists of 28 UVC-LED beads and a constant current drive circuit 502, with the emitting surface of the 28 UVC-LED beads in a linear shape. The constant current drive circuit 502 receives the PWM control signal from the SOC computing unit 5033 to adjust the brightness of the UVC-LED beads from 0 to 100. The 28 UVC-LED lamps are connected in a 2-series-14-parallel configuration, with adjacent parallel circuits sharing a single control signal, resulting in a total of 7 control signals. Therefore, each group of four adjacent UVC-LED lamps can operate independently, unaffected by the operation of other UVC-LED lamps. Preferably, the control circuit uses an AO3400A field-effect transistor. This control method results in a light source with adjustable ultraviolet light intensity and controllable irradiation area.

[0031] Further, preferably, the RF antenna unit 5031 uses an AN9520 RF antenna, the USB data input unit 5032 uses a TYPE-C 16PIN interface, the SOC computing unit 5033 uses an ESP32-PICO-D4 chip, the USB-to-TTL circuit unit 5034 uses a CH340K interface chip, and the automatic download circuit 5035 includes a first transistor Q8 and a second transistor Q9. The collector of the first transistor Q8 is electrically connected to the RTS pin of the USB-to-TTL circuit unit 5034, and the collector of the second transistor Q9 is electrically connected to the DTR pin of the USB-to-TTL circuit unit 5034. The magnetic encoder circuit 5042 uses an AS5047U-HTST magnetic encoder, and the stepper motor drive circuit 5041 is impedance matched to the magnetic encoder circuit 5042 through a resistor.

[0032] The above description only illustrates the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A reflective scanning surface sterilization device, characterized in that: The device includes a housing, a light source, a reflector structure, a stepper motor, a main circuit board, and a cooling fan. The light source is housed within the housing, and the reflector structure is positioned along the optical path of the light source. The stepper motor is driven by the reflector structure, and the main circuit board is electrically connected to the stepper motor. The cooling fan is located on one side of the light source. The light source includes a light source panel, a Teflon focusing structure, a secondary optical lens, and a heat sink. The Teflon focusing structure is positioned along the optical path of the light source panel, the secondary optical lens is positioned along the optical path of the Teflon focusing structure, and the reflector structure is positioned along the optical path of the secondary optical lens. The heat sink is attached to the back of the light source panel. The reflector structure includes a reflector, a first bearing, a second bearing, and a conveyor belt. The bottom of the reflector is connected to the housing via the first bearing, and the top of the reflector has a second bearing connected to the stepper motor via the conveyor belt. The reflector is triangular prism-shaped and has three sides. The first side of the mirror is a smooth flat reflective surface, the second side of the mirror is a smooth arc reflective surface with a radius of 200mm, and the third side of the mirror is a smooth plane containing a light intensity sampling port at a 45° angle to the horizontal plane. The main circuit board includes a DC-DC power conversion circuit, a calculation block circuit, a servo block circuit, and a constant current drive circuit. The DC-DC power conversion circuit is electrically connected to the calculation block circuit, the servo block circuit, and the constant current drive circuit, respectively. The calculation block circuit is electrically connected to the light source board through the constant current drive circuit, and the calculation block circuit is electrically connected to the stepper motor through the servo block circuit. The calculation block circuit includes an RF antenna unit, a USB data input unit, a SOC calculation unit, a USB to TTL circuit unit, and an automatic download circuit. The RF antenna unit is electrically connected to the SOC calculation unit, the USB data input unit is electrically connected to the USB to TTL circuit unit, and the SOC calculation unit is electrically connected to the automatic download circuit through the USB to TTL circuit unit.

2. The reflective scanning surface sterilization device according to claim 1, characterized in that: The radio frequency antenna unit uses an AN9520 radio frequency antenna, the USB data input unit uses a TYPE-C16PIN interface, the SOC computing unit uses an ESP32-PICO-D4 chip, the USB to TTL circuit unit uses a CH340K interface chip, and the automatic download circuit includes a first transistor and a second transistor. The collector of the first transistor is electrically connected to the RTS pin of the USB to TTL circuit unit, and the collector of the second transistor is electrically connected to the DTR pin of the USB to TTL circuit unit.

3. The reflective scanning surface sterilization device according to claim 1, characterized in that: The servo block circuit includes a stepper motor drive circuit and a magnetic encoder circuit, wherein the magnetic encoder circuit is electrically connected to the stepper motor through the stepper motor drive circuit.

4. The reflective scanning surface sterilization device according to claim 3, characterized in that: The magnetic encoder circuit uses an AS5047U-HTST magnetic encoder, and the stepper motor drive circuit is impedance matched with the magnetic encoder circuit through a resistor.

5. The reflective scanning surface sterilization device according to claim 1, characterized in that: The light source board consists of 28 UVC-LED beads. The constant current drive circuit adopts a 7-way control circuit. The 28 UVC-LED beads are connected in a 2-series-14-parallel configuration. Two adjacent parallel circuits share one control circuit. The control circuit uses an AO3400A field-effect transistor.

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