Industrial camera dustproof device and method based on flowing air curtain
By creating a high-speed airflow barrier on the industrial camera using a flowing air curtain device, the problem of blurred images caused by dust adhesion is solved, achieving a low-cost, maintenance-free dustproof effect, and also providing cooling and heat dissipation functions.
Patent Information
- Application Number
- CN202511633632.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-10
- Publication Date
- 2026-01-13
AI Technical Summary
Existing industrial camera lenses are prone to dust particles adhering to them in high-dust and high-humidity environments, resulting in poor image quality. Existing dust prevention methods have problems such as fogging of the sealing cover, the need for frequent cleaning, replacement of consumables, electrostatic interference with the camera, or high costs.
It adopts a dustproof device based on a flowing air curtain, which forms a stable high-speed airflow barrier through the airflow movement pipe and the air intake pipe to isolate dust and prevent it from adhering to the lens. It has a simple structure, requires no cleaning or replacement of consumables, has low power consumption, and has its own cooling and heat dissipation function.
It effectively shields dust particles smaller than 5μm, resists external air disturbances, has low power consumption and cost, is quick to install, requires no separate power supply, and does not affect camera performance.
Smart Images
Figure CN121334476A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of industrial visual inspection technology, and in particular to an industrial camera dustproof device and dustproof method based on a flowing air curtain. Background Technology
[0002] In the field of industrial vision inspection, especially in high-dust and high-humidity environments such as automobile manufacturing, metal processing, and food and pharmaceutical industries, industrial camera lenses are prone to dust particle adhesion, which seriously affects the visual imaging effect; currently available dust prevention methods are insufficient.
[0003] 1. Use a fully sealed cover: The lens inside the sealed cover may fog up due to the temperature and humidity difference between the inside and outside of the sealed cover. Poor heat dissipation due to the fully sealed lens may also cause fogging inside the sealed cover due to the temperature difference between the inside and outside of the sealed cover. In addition, dust on the outer surface of the sealed cover will affect the visual effect of the lens and requires frequent manual cleaning and maintenance.
[0004] 2. Uses replaceable lens dustproof lens: This requires frequent replacement, and the dustproof lens is a consumable;
[0005] 3. Electrostatic dust removal: This method uses static electricity to attract dust onto the surrounding pipe walls. However, it requires frequent cleaning and maintenance of the pipe walls. The electrostatic generator is expensive and requires a power supply. Strong electrostatic fields (>10kV) may cause dark current noise or pixel abnormalities (such as bright spots / stripes) in the CMOS / CCD sensor inside the lens. It is also expensive to use.
[0006] 4. Using a cyclone dust removal and purification device: This requires power to the spiral fan, the device is complex and the purification is incomplete (the capture efficiency of <5μm dust drops sharply (only 30%-60%), the cost is high, and a separate power supply is required.
[0007] Technological gap: There is an urgent need for a maintenance-free, well-shielded, camera-friendly, low-power, and low-cost solution to address the image blurring problem caused by dust particle adhesion. Summary of the Invention
[0008] To address the aforementioned issues, this invention provides an industrial camera dustproof device and method based on a flowing air curtain. It eliminates the need for dust cover cleaning or consumable replacement; effectively shields against fine dust particles <5μm and possesses a certain resistance to external air disturbances; it prevents interference from electric or magnetic fields; power consumption cost is ≤100 RMB / year; installation time is ≤10 minutes, requiring no separate power supply; it features a simple structure without complex electrical or mechanical components; and it includes built-in cooling and heat dissipation functions.
[0009] This invention proposes an industrial camera dustproof device based on a flowing air curtain, comprising an airflow duct, an air inlet pipe, an industrial camera, and a camera centering bracket;
[0010] The airflow duct is a cylindrical body open at one end. One end of the air inlet pipe is connected to the center of the bottom wall of the airflow duct. The input end of the air inlet pipe is connected to the factory's compressed air source via a flexible hose. An industrial camera is coaxially and horizontally housed within the cylindrical body of the airflow duct. The data cable at the rear of the industrial camera penetrates the rear side wall of the airflow duct and protrudes outside the airflow duct. The upper side wall of the industrial camera is detachably connected to the lower end of the camera centering bracket. The upper end of the camera centering bracket is slidably fitted onto the upper side wall of the cylindrical body of the airflow duct. The upper end of the camera centering bracket protrudes outside the upper side wall of the cylindrical body of the airflow duct and can be limited and fixed by the outer side wall of the upper end of the cylindrical body of the airflow duct. The industrial camera is horizontally suspended inside the airflow duct. An annular slit is formed between the lens side wall of the industrial camera 1 and the inner side wall of the aligned airflow duct. A central diverter (industrial) is placed inside the airflow duct. The camera's central diffuser compresses the gas against the pipe wall, creating a Bernoulli effect and generating a localized high-speed gas flow around the diffuser. The pipe is then narrowed near the leeward side of the diffuser, continuously forming a stable high-speed airflow barrier at the leeward end. This effectively isolates dust from adhering to the lens. Finally, the airflow duct opening is widened to facilitate gas exhaust and create a certain area to resist external turbulence. This invention eliminates the need for dust cover cleaning or consumable replacement; it effectively shields against fine dust particles <5μm and has a certain resistance to external air disturbances; it avoids electric and magnetic field interference to industrial cameras; power consumption cost ≤100 RMB / year (gas consumption ≤5000 kg / year); installation time ≤10 minutes, no separate power supply required; simple structure, no complex electrical or mechanical components; and built-in cooling and heat dissipation function.
[0011] The airflow duct includes an upper shell, a lower shell, and a threaded pipe connector. The upper and lower shells are matched and interlocked to form a pipe. The outer wall of the rear end of the pipe is threaded, and the threaded pipe connector is screwed into the thread at the rear end of the pipe. The rear end of the pipe connector is connected to the air inlet pipe. Four pairs of interlocking plates are symmetrically protruding from the outer surface of the joint on the left and right sides of the upper and lower shells. Two pairs of interlocking plates are respectively aligned and fixed to the front of the upper and lower shells, and the other two pairs of interlocking plates are respectively aligned and fixed to the rear of the upper and lower shells. A pair of interlocking plates on the same side of the upper and lower shells are fixed by fastening bolts. The installation time is ≤10 minutes, the structure is simple, and there are no complex electrical or mechanical structures.
[0012] The airflow duct is a straight cylinder with a uniform inner diameter from front to back, and the inner wall diameter of the airflow duct is D = 2.5d (d is the outer wall diameter of the industrial camera); or, corresponding to the rear end face of the industrial camera lens, the inner wall diameter of the straight cylinder of the airflow duct is D = 2.5d, and the circumferential inner wall of the airflow duct begins to taper outward at a six-degree angle to the rear circumferential inner wall of the airflow duct at the front position of the industrial camera lens end face, with a horizontal length b = 2 / 3a (a is the body length of the industrial camera), forming a bell-shaped opening cylindrical body; or, corresponding to the rear end position of the industrial camera body, the inner wall diameter of the straight cylinder of the airflow duct is D = 2.5d, and the upper and lower lines of the cross-section of the airflow duct corresponding to the front position of the rear end position of the industrial camera body form a B-spline curve structure. The starting point of the B-spline curve of the airflow duct corresponds to the rear end face of the industrial camera body, and the curved surface is tangent to the straight pipe wall at this position. The B-spline curve of the airflow duct terminates at the front opening face of the airflow duct. The first control point of the B-spline curve of the airflow duct is located at the corresponding position on the end face of the industrial camera lens, and the vertical distance between the first control point and the axis of the airflow duct is 1 / 3a. The second control point of the B-spline curve of the airflow duct is located at the front 1 / 3a of the end face of the industrial camera lens, and the vertical distance between the second control point and the axis of the airflow duct is 1 / 3a+1mm. The ending point of the B-spline curve is located at the front 2 / 3a of the end face of the industrial camera lens, and the vertical distance between the ending point of the B-spline curve and the axis of the airflow duct is 4 / 9a. This has been verified by aerodynamic simulation (see...). Figure 5 As shown, the flowing gas in the airflow duct can form a high-speed airflow at the outer wall of the industrial camera lens, effectively forming a dustproof air wall in front of the lens. The thickness of the dustproof air wall is 1 / 3a, achieving a good dustproof effect and suitable for wide-field cameras; no dust cover cleaning or consumable replacement is required; it can still effectively shield tiny dust particles <5μm and has a certain resistance to external air disturbances.
[0013] The B-spline curve of the airflow duct has eight spiral guide ribs evenly distributed from the opening end inward on its circumferential inner wall. The rear end of each spiral guide rib extends spirally to the rear end face of the corresponding industrial camera body. The angle α between the line connecting any point on the same vertical end face of any two adjacent spiral guide ribs and the center point of that vertical end face is 45°. The angle β between the projection of the line connecting the starting point of each spiral guide rib to the center point of its vertical end face and the line connecting the ending point of the same spiral guide rib to the center point of its vertical end face onto the starting point's vertical end face is 45°. The B-spline curve at the front end of the airflow duct, combined with the eight circumferentially evenly distributed spiral guide ribs, can form a spiral air curtain barrier in front of the airflow duct and the lens end face of the industrial camera, forming a high-strength gas curtain with strong resistance to external airflow disturbance, achieving better dust prevention, and is suitable for large-field-of-view cameras.
[0014] The outer wall of the opening end of the airflow duct is detachably fitted with an anti-turbulence hood, which can resist strong environmental airflow disturbances. The anti-turbulence hood includes an upper half hood, a lower half hood, and four connecting and fixing pieces. The upper half hood and the lower half hood are joined together and fastened. Their rear ends are fitted onto the outer wall of the airflow duct at the position corresponding to the lens surface of an industrial camera. The four connecting and fixing pieces are fixed in pairs on the left and right sides of the rear ends of the upper half hood and the lower half hood, respectively. The two connecting and fixing pieces on the same side of the upper half hood and the lower half hood are aligned and clamped and fixed to the pair of upper and lower contacting fastening pieces at the front. The anti-turbulence hood is fitted and fixed to the airflow duct by fastening bolts. The horizontal distance between the opening end face of the anti-turbulence hood and the opening end face of the airflow duct is 95mm-105mm, and the horizontal distance between the rear end face of the anti-turbulence hood and the opening end face of the airflow duct is 45mm-55mm.
[0015] The upper half of the airflow duct has a sliding sleeve protruding from its upper end face corresponding to the camera centering bracket position. The camera centering bracket has an inverted T-shaped structure, including a support surface and a quadrangular prism rod. The lower end of the support surface is detachably connected to the upper side wall of the industrial camera, and the upper end of the support surface is fixedly connected to the lower end of the quadrangular prism rod. The quadrangular prism rod is slidably fitted into the sliding sleeve, with its upper end exposed outside the upper end face of the sliding sleeve. A horizontal pin passes through the outer side wall of the sliding sleeve and can be pressed and fixed to the quadrangular prism rod. A gas flow display and regulating valve is connected to the air inlet pipe, which can monitor energy consumption and adjust the air intake volume.
[0016] A dust prevention method for an industrial camera dust prevention device based on a flowing air curtain, comprising the following steps:
[0017] S1. Install the airflow duct and industrial camera. Coaxially fit the industrial camera into the airflow duct. Connect the air inlet pipe and the gas flow display and regulating valve to the end of the airflow duct.
[0018] S2. Based on the disturbing wind force of the working environment, select the following types of industrial camera dustproof devices to install: simple type, basic type, optimized type, or enhanced type. The simple type has low cost and can be used for temporary use or replaced with other simple materials; the basic type has low cost and a wide field of view; the optimized type has a stable dustproof effect; and the enhanced type has strong resistance to external airflow disturbance.
[0019] S3. Standard industrial compressed air is introduced into the intake pipe. The water vapor (dew point) of the compressed air is ≤-40℃, the particulate matter in the compressed air is ≤Class 2, the oil content in the compressed air is ≤0.1mg / m³, the flow rate of the compressed air is 0.00016kg / s, and the pressure of the compressed air is 0.4MPa. Dust protection is provided for the industrial camera in the airflow duct.
[0020] The specific operation of step S1 is as follows: First, connect the camera centering bracket to the industrial camera; assemble and sleeve the upper half of the airflow duct shell with the camera centering bracket, with the vertical distance between the centerline of the airflow duct and the upper edge of the sliding sleeve being 80mm; the vertical distance between the lower end face of the support surface of the camera centering bracket and the upper end face of the quadrangular prism rod being 100mm; the center distance between the lower end face of the support surface and the axis of the industrial camera is L1, and the vertical distance between the upper edge of the sliding sleeve and the upper end face of the quadrangular prism rod is L2. Therefore, L2 = 100 + L1 - 80 = 20 + L1. After measurement, determine the value of the upper end of the quadrangular prism rod of the camera centering bracket protruding from the upper edge of the sliding sleeve according to the L2 value. L2 ensures the industrial camera is coaxially connected to the airflow duct. Tighten the horizontal pins to fix the industrial camera coaxially inside the airflow duct. Screw the upper and lower halves of the airflow duct together and secure them. Lead the industrial camera communication cable out circumferentially through the pre-drilled hole at the rear of the airflow duct. If an anti-turbulence cover is required, clamp and fix the upper and lower halves of the anti-turbulence cover to the outer wall of the airflow duct and screw them together. The front end of the air inlet pipe is connected to the rear end of the pipe body connector, and a gas flow display and regulating valve is connected to the air inlet pipe. Connect the upper end of the camera centering bracket to the external bracket and lock it.
[0021] In step S2, when the disturbance wind force in the work scene is ≤1m / s, a simple industrial camera dustproof device can be installed; when 1m / s < the disturbance wind force in the work scene is ≤2m / s, a basic industrial camera dustproof device can be selected; when 2m / s < the disturbance wind force in the work scene is ≤3m / s, an optimized industrial camera dustproof device can be selected.
[0022] The airflow duct in the simplified industrial camera dustproof device is a straight cylinder with a consistent inner diameter from front to back, and the inner wall diameter of the airflow duct is D=2.5d;
[0023] In the basic industrial camera dustproof device, the airflow duct corresponding to the rear end face of the industrial camera lens is a straight cylinder with the same inner diameter. The inner wall diameter of the straight cylinder of the airflow duct corresponding to the rear end face of the industrial camera lens is D=2.5d. The circumferential inner wall of the airflow duct starts from the front position of the front end face of the industrial camera lens and expands outward in a conical shape with an angle of six degrees with the circumferential inner wall of the rear end face of the airflow duct. The horizontal length of the conical expansion duct is b=2 / 3a, forming a cylindrical body with a horn-shaped opening.
[0024] In the optimized industrial camera dustproof device, the airflow duct corresponding to the rear of the industrial camera body is a straight cylinder with the same inner diameter. The inner wall diameter of the straight cylinder of the airflow duct at the rear of the industrial camera body is D=2.5d. The upper and lower lines of the cross-section of the airflow duct at the front of the rear of the industrial camera body form a B-spline curve structure. Specifically, the starting point of the B-spline curve of the airflow duct corresponds to the rear of the industrial camera body, and the curved surface is tangent to the straight cylinder wall at this position. The B-spline curve of the airflow duct terminates at the front opening of the airflow duct. The first control point of the B-spline curve of the airflow duct is located at the corresponding position on the end face of the industrial camera lens. The vertical distance between the first control point and the axis of the airflow duct is 1 / 3a. The second control point of the B-spline curve of the airflow duct is located at the end face of the industrial camera lens. At the front 1 / 3a of the end face, the vertical distance between the second control point and the axis of the airflow duct is 1 / 3a+1mm; the endpoint of the B-spline curve is located at the front 2 / 3a of the end face of the industrial camera lens, and the vertical distance between the endpoint of the B-spline curve and the axis of the airflow duct is 4 / 9a; the circumferential inner wall of the B-spline curve of the airflow duct has eight spiral guide ribs evenly distributed from the opening end inwards. The rear end of each spiral guide rib extends spirally to the rear end face of the corresponding industrial camera body. The angle between the line connecting any point on the same vertical end face of two adjacent spiral guide ribs and the center point of that vertical end face is α, which is 45°. The angle between the projection of the line connecting the starting point of each spiral guide rib and the center point of its vertical end face and the line connecting the ending point of the same spiral guide rib and the center point of its vertical end face onto the starting point vertical end face is β, which is 45°.
[0025] In step S2, when 3m / s < the disturbance wind force of the work scene ≤ 5m / s (at this time there is external wind disturbance, such as a cooling fan on site), an enhanced industrial camera dustproof device can be selected.
[0026] The enhanced industrial camera dustproof device is based on the optimized industrial camera dustproof device, with an anti-turbulence shroud circumferentially fitted onto the outer wall of the opening end of the airflow duct. The cooling fan is generally placed at 45° above the personnel working environment. The external airflow disturbance has the greatest impact when the wind is perpendicular to the lens axis. In this case, the industrial camera lens of the enhanced industrial camera dustproof device should be facing downwards, taking pictures from top to bottom, and forming an acute angle with the horizontal plane. This angle ranges from 10° to 45° to effectively deal with external air disturbance.
[0027] Beneficial effects
[0028] The present invention has the following advantages:
[0029] 1. Maintenance-free: No need to clean the dust cover or replace consumables;
[0030] 2. Good shielding effect: It can still effectively shield tiny dust particles <5μm and has a certain resistance to external air disturbances;
[0031] 3. No interference: No electric or magnetic fields interfere with the camera;
[0032] 4. Low power consumption: Power consumption cost ≤ 100 RMB / year;
[0033] 5. Easy installation: Installation time ≤ 10 minutes, no separate power supply required;
[0034] 6. Low cost: Simple structure, no complex electrical or mechanical components;
[0035] 7. Excellent heat dissipation: It has a built-in cooling and heat dissipation function. Attached Figure Description
[0036] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 .
[0037] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .
[0038] Figure 3 This is a cross-sectional structural diagram of the present invention.
[0039] Figure 4 This is a side view structural diagram of an embodiment of the present invention.
[0040] Figure 5 This is a simulation analysis diagram of the air curtain formation of the present invention.
[0041] In the picture:
[0042] 1. Airflow duct; 11. Upper shell; 12. Lower shell; 13. Pipe connector; 14. Fastening connector; 15. Fastening bolt; 16. Helical guide rib; 17. Sliding sleeve; 171. Horizontal pin;
[0043] 2. Air intake pipe;
[0044] 3. Industrial cameras;
[0045] 4. Camera centering bracket; 41. Support surface; 42. Quadrilateral prism rod;
[0046] 5. Anti-turbulence fairing; 51. Upper half of the fairing; 52. Lower half of the fairing; 53. Connecting and fixing plate;
[0047] 6. Gas flow display and regulating valve. Detailed Implementation
[0048] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.
[0049] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.
[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.
[0051] Example 1
[0052] See Figures 1-3As shown, an industrial camera dustproof device based on a flowing air curtain includes an airflow movement duct 1, an air inlet pipe 2, an industrial camera 3, and a camera centering bracket 4.
[0053] The airflow duct 1 is a cylindrical body with one open end. One end of the air inlet pipe 2 is connected to the center of the bottom wall of the airflow duct 1. The industrial camera 3 is coaxially and horizontally housed in the cylindrical body of the airflow duct 1. The data cable at the rear end of the industrial camera 3 penetrates the rear side wall of the airflow duct 1 and is exposed outside the airflow duct 1. The upper side wall of the industrial camera 3 is detachably connected to the lower end of the camera centering bracket 4. The upper end of the camera centering bracket 4 is slidably sleeved on the upper side wall of the cylindrical body of the airflow duct 1. The upper end of the camera centering bracket 4 is exposed outside the upper side wall of the cylindrical body of the airflow duct 1 and can be limited and fixed by the upper outer side wall of the cylindrical body of the airflow duct 1. The industrial camera 3 is horizontally suspended inside the airflow duct 1. An annular slit is formed between the lens side wall of the industrial camera 1 and the inner side wall of the aligned airflow duct 1.
[0054] The airflow duct 1 includes an upper shell 11, a lower shell 12, and a threaded pipe connector 13. The upper shell 11 and the lower shell 12 are matched and fastened together to form a pipe. The outer wall of the rear end of the pipe is threaded. The threaded pipe connector 13 is screwed into the thread at the rear end of the pipe. The rear end of the pipe connector 13 is connected to the air inlet pipe 2. Four pairs of fastening connecting pieces 14 are symmetrically protruding from the outer surface of the joint on the left and right sides of the upper shell 11 and the lower shell 12. Two pairs of fastening connecting pieces 14 are respectively aligned and fixed to the front of the upper shell 11 and the lower shell 12. The other two pairs of fastening connecting pieces 14 are respectively aligned and fixed to the rear of the upper shell 11 and the lower shell 12. A pair of fastening connecting pieces 14 aligned vertically on the same side of the upper shell 11 and the lower shell 12 are fastened and fixed by fastening bolts 15.
[0055] The airflow duct 1 is a straight cylinder with a consistent inner diameter from front to back (not shown in the figure), and the inner wall diameter of the airflow duct 1 is D=2.5d (d is the outer wall diameter of the industrial camera 3).
[0056] The upper half of the airflow duct 1 has a sliding sleeve 17 protruding from its upper end face corresponding to the position of the camera centering bracket 4. The camera centering bracket 4 has an inverted T-shaped structure, including a support surface 41 and a quadrangular prism rod 42. The lower end of the support surface 41 is detachably connected to the upper side wall of the industrial camera 3, and the upper end face of the support surface 41 is fixedly connected to the lower end of the quadrangular prism rod 42. The quadrangular prism rod 42 is slidably fitted into the sliding sleeve 17, and the upper end of the quadrangular prism rod 42 is exposed outside the upper end face of the sliding sleeve 17. A horizontal pin 171 passes through the outer side wall of the sliding sleeve 17 and can be pressed and limited to fix the quadrangular prism rod 42. A gas flow display and regulating valve 6 is connected to the air inlet pipe 2.
[0057] Example 2
[0058] See Figures 1-3 As shown, an industrial camera dustproof device based on a flowing air curtain differs from Embodiment 1 in that the inner wall diameter D of the straight cylindrical body of the airflow movement duct 1 corresponding to the rear end face of the industrial camera lens is 2.5d, and the circumferential inner wall of the airflow movement duct 1 begins to taper outward at a six-degree angle to the front end position of the lens end face of the industrial camera 3, forming a cylindrical body with a horn-shaped opening.
[0059] Example 3
[0060] See Figures 1-4 As shown, an industrial camera dustproof device based on a flowing air curtain differs from Embodiment 1 in that the inner wall diameter D of the straight cylinder of the airflow duct 1 at the rear end of the industrial camera body is 2.5d, and the upper and lower lines of the cross section of the airflow duct 1 at the forward position of the rear end of the industrial camera body are B-spline curves. That is, the starting point of the B-spline curve of the airflow duct 1 corresponds to the rear end face of the industrial camera body, and the curved surface is tangent to the straight cylinder wall at this position. The B-spline curve of the airflow duct 1 terminates at the front end of the airflow duct 1. The opening face; the first control point of the B-spline curve of the airflow duct 1 is located at the corresponding position of the end face of the industrial camera lens, and the vertical distance between the first control point and the axis of the airflow duct 1 is 1 / 3a. The second control point of the B-spline curve of the airflow duct 1 is located at the front 1 / 3a of the end face of the industrial camera lens 3, and the vertical distance between the second control point and the axis of the airflow duct 1 is 1 / 3a+1mm. The end point of the B-spline curve is located at the front 2 / 3a of the end face of the industrial camera lens 3, and the vertical distance between the end point of the B-spline curve and the axis of the airflow duct 1 is 4 / 9a.
[0061] The circumferential inner wall of the B-spline curve of the airflow duct 1 has eight spiral guide ribs 16 evenly distributed from the opening end inward. The rear end of each spiral guide rib 16 extends spirally to the rear end face of the corresponding industrial camera 3 body. The angle α between the line connecting any point on the same vertical end face of two adjacent spiral guide ribs 16 and the center point of that vertical end face is 45°. The angle β between the projection of the line connecting the starting point of each spiral guide rib 16 and the center point of its vertical end face and the line connecting the ending point of the same spiral guide rib 16 and the center point of its vertical end face onto the starting point vertical end face is 45°.
[0062] Example 4
[0063] See Figures 1-4As shown, an industrial camera dustproof device based on a flowing air curtain differs from Embodiment 3 in that an anti-turbulence shroud 5 is detachably fitted around the outer wall of the opening end of the airflow duct 1. The anti-turbulence shroud 5 includes an upper half shroud 51, a lower half shroud 52, and four connecting and fixing pieces 53. The upper half shroud 51 and the lower half shroud 52 are joined and fastened together, with their rear ends fitted onto the outer wall of the airflow duct 1 at the position corresponding to the lens surface of the industrial camera 3. The four connecting and fixing pieces 53 are fixed in pairs, one above the other. On the left and right sides of the rear end of the half-cover 51 and the lower half-cover 52, two connecting and fixing pieces 53 on the same side of the upper half-cover 51 and the lower half-cover 52 clamp and fix a pair of upper and lower contacting fastening connecting pieces 14 at the front. The anti-turbulence cover 5 and the airflow movement pipe 1 are sleeved and fixed by fastening bolts 15. The horizontal distance between the opening end face of the anti-turbulence cover 5 and the opening end face of the airflow movement pipe 1 is 100mm, and the horizontal distance between the rear end face of the anti-turbulence cover 5 and the opening end face of the airflow movement pipe 1 is 50mm.
[0064] Example 5
[0065] See Figures 1-4 As shown, a dust prevention method is used in the aforementioned industrial camera dust prevention device based on a flowing air curtain, and the steps are as follows:
[0066] S1. Install the airflow movement pipe 1 and the industrial camera 3. Coaxially fit the industrial camera 3 into the airflow movement pipe 1. Connect the air inlet pipe 2 and the gas flow display and regulating valve 6 to the end of the airflow movement pipe 1.
[0067] S2. Depending on the disturbing wind force in the work environment, select and install a simple industrial camera dustproof device, a basic industrial camera dustproof device, an optimized industrial camera dustproof device, or an enhanced industrial camera dustproof device.
[0068] S3. Conventional industrial compressed air (compliant with GB / T 13277.1-2023) is introduced into the intake pipe 2. The water vapor (dew point) of the compressed air is ≤-40℃ (compliant with GB 9448-2023), the particulate matter in the compressed air is ≤Class 2 (compliant with GB / T32877-2016), the oil content in the compressed air is ≤0.1mg / m³ (Class 1) (compliant with GB / T 30475.3-2022), the flow rate of the compressed air is 0.00016kg / s, and the pressure of the compressed air is 0.4MPa. The industrial camera 3 in the airflow duct 1 is protected against dust.
[0069] The specific operation of step S1 is as follows: First, connect the camera centering bracket 4 to the industrial camera 3; assemble and sleeve the upper half shell 11 of the airflow movement duct 1 with the camera centering bracket 4, with the vertical distance between the centerline of the airflow movement duct 1 and the upper edge of the sliding sleeve 17 being 80mm; the vertical distance between the lower end face of the support surface 41 of the camera centering bracket 4 and the upper end face of the quadrangular prism rod 42 being 100mm; the center distance between the lower end face of the support surface 41 and the axis of the industrial camera 3 is L1. =14.5mm, the vertical distance between the upper edge of the sliding sleeve 17 and the upper end face of the quadrangular prism rod 42 is L2, then L2=100+L1-80=20+L1. After measurement, according to L2=34.5mm, the value of the upper end of the quadrangular prism rod 42 of the camera centering bracket 4 protruding from the upper edge of the sliding sleeve 17 is determined to be L2, which can ensure that the industrial camera 3 and the airflow movement pipe 1 are coaxially connected. Tighten the horizontal pin 171 to coaxially connect and fix the industrial camera 3 in the airflow movement pipe 1; the airflow movement pipe 1 The upper half shell 11 and the lower half shell 12 are screwed together and fixed. The communication cable of the industrial camera 3 is led out circumferentially through the reserved hole at the rear of the airflow duct 1. If it is necessary to install the anti-turbulence cover 5, the upper half cover 51 and the lower half cover 52 of the anti-turbulence cover 5 are clamped and fixed to the outer wall of the airflow duct 1 and screwed together. The front end of the air inlet pipe 2 is connected to the rear end of the pipe body connecting nozzle 13. A gas flow display and regulating valve 6 is connected to the air inlet pipe 2. The upper end of the camera centering bracket 4 is connected to the external bracket and locked.
[0070] In step S2, when the disturbance wind force in the work scene is ≤1m / s, a simple industrial camera dustproof device can be installed; when 1m / s < the disturbance wind force in the work scene is ≤2m / s, a basic industrial camera dustproof device can be selected; when 2m / s < the disturbance wind force in the work scene is ≤3m / s, an optimized industrial camera dustproof device can be selected.
[0071] The airflow duct 1 in the simplified industrial camera dustproof device is a straight cylinder with a consistent inner diameter from front to back, and the inner wall diameter D of the airflow duct 1 is 2.5d;
[0072] In the basic industrial camera dustproof device, the airflow duct 1 corresponding to the rear end face of the industrial camera lens is a straight cylinder with the same inner diameter. The inner wall diameter of the straight cylinder of the airflow duct 1 corresponding to the rear end face of the industrial camera lens is D=2.5d. The circumferential inner wall of the airflow duct 1 starts from the front position of the front end face of the industrial camera lens and expands outward at a six-degree angle with the rear circumferential inner wall of the airflow duct 1. The horizontal length of the tapered expansion duct is b=2 / 3a, forming a cylindrical body with a horn-shaped opening.
[0073] In the optimized industrial camera dustproof device, the airflow duct 1 corresponding to the rear end face of the industrial camera 3 is a straight cylinder with the same inner diameter. The inner wall diameter D of the straight cylinder of the airflow duct 1 at the rear end face of the industrial camera body is 2.5d. The upper and lower lines of the cross section of the airflow duct 1 at the front end face of the industrial camera 3 form a B-spline curve structure. That is, the starting point of the B-spline curve of the airflow duct 1 corresponds to the rear end face of the industrial camera 3 body, and the curved surface is tangent to the straight cylinder wall at this position. The B-spline curve of the airflow duct 1 terminates at the front opening face of the airflow duct 1. The first control point of the B-spline curve of the airflow duct 1 is located at the corresponding position of the end face of the industrial camera lens. The vertical distance between the first control point and the axis of the airflow duct 1 is 1 / 3a. The second control point of the B-spline curve of the airflow duct 1 is located at the end face of the industrial camera lens. At the front 1 / 3a, the vertical distance between the second control point and the axis of the airflow duct 1 is 1 / 3a+1mm; the endpoint of the B-spline curve is located at the front 2 / 3a of the lens end of the industrial camera 3, and the vertical distance between the endpoint of the B-spline curve and the axis of the airflow duct 1 is 4 / 9a; the circumferential inner wall of the B-spline curve of the airflow duct 1 has eight spiral guide ribs 16 evenly distributed from the opening end inwards. The rear end of each spiral guide rib 16 extends spirally to the corresponding rear end face of the industrial camera 3 body. The angle between the line connecting the point of any two adjacent spiral guide ribs 16 on any vertical end face and the center point of that vertical end face is α, which is 45°. The angle between the projection line of the line connecting the starting point of each spiral guide rib 16 and the center point of its vertical end face and the line connecting the ending point of the same spiral guide rib 16 and the center point of its vertical end face onto the starting point vertical end face is β, which is 45°.
[0074] In step S2, when 3m / s < the disturbance wind force of the work scene ≤ 5m / s, there is external wind disturbance. For example, if there is a cooling fan on site, an enhanced industrial camera dustproof device can be selected.
[0075] The enhanced industrial camera dustproof device is based on the optimized industrial camera dustproof device, with an anti-turbulence shroud 5 circumferentially fitted on the outer wall of the opening end of the airflow duct 1. The cooling fan is generally placed at 45° above the personnel working environment. The situation where the external airflow disturbance has the greatest impact is when the wind is perpendicular to the lens axis. At this time, the lens of the industrial camera 3 of the enhanced industrial camera dustproof device should be facing down, taking pictures from top to bottom, and forming an acute angle with the horizontal plane. The angle range is 10°-45°, so as to effectively deal with the external air disturbance.
[0076] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.
Claims
1. A dustproof device for industrial cameras based on a flowing air curtain, characterized in that: Includes airflow duct (1), air inlet pipe (2), industrial camera (3), and camera centering bracket (4); The airflow duct (1) is a cylindrical body with one end open. One end of the air inlet pipe (2) is connected to the center of the bottom wall of the airflow duct (1). The industrial camera (3) is coaxially and horizontally housed in the cylindrical body of the airflow duct (1). The data cable at the rear end of the industrial camera (3) penetrates the rear side wall of the airflow duct (1) and is exposed outside the airflow duct (1). The upper side wall of the industrial camera (3) is detachably connected to the lower end of the camera centering bracket (4). The upper end of the camera centering bracket (4) is slidably sleeved on the upper side wall of the cylindrical body of the airflow duct (1). The upper end of the camera centering bracket (4) is exposed outside the upper side wall of the cylindrical body of the airflow duct (1) and can be limited and fixed by the upper outer side wall of the cylindrical body of the airflow duct (1). The industrial camera (3) is horizontally suspended inside the airflow duct (1). The lens side wall of the industrial camera 1 and the inner side wall of the aligned airflow duct (1) form an annular slit.
2. The industrial camera dustproof device based on a flowing air curtain according to claim 1, characterized in that: The airflow duct (1) includes an upper shell (11), a lower shell (12), and a threaded pipe connector (13); the upper shell (11) and the lower shell (12) are fitted together to form a pipe, the outer wall of the rear end of the pipe is threaded, and the threaded pipe connector (13) is screwed into the thread at the rear end of the pipe, the rear end of the pipe connector (13) is connected to the air inlet pipe (2); the upper shell (11) and the lower shell (12) are connected to the threaded pipe at the rear end of the pipe. Four pairs of snap-fit connecting pieces (14) are symmetrically protruding on the outer surface of the joint. Two pairs of snap-fit connecting pieces (14) are respectively aligned and fixed to the front of the upper half shell (11) and the lower half shell (12). The other two pairs of snap-fit connecting pieces (14) are respectively aligned and fixed to the rear of the upper half shell (11) and the lower half shell (12). A pair of snap-fit connecting pieces (14) aligned on the same side of the upper half shell (11) and the lower half shell (12) are screwed and fixed by fastening bolts (15).
3. The industrial camera dustproof device based on a flowing air curtain according to claim 2, characterized in that: The airflow duct (1) is a straight cylinder with a consistent inner diameter from front to back, and the inner wall diameter of the airflow duct (1) is D=2.5d; or, the inner wall diameter of the straight cylinder of the airflow duct (1) corresponding to the rear end face of the industrial camera lens is D=2.5d, and the circumferential inner wall of the airflow duct (1) starts from the front position of the end face of the industrial camera (3) and expands outward at a six-degree angle to the rear circumferential inner wall of the airflow duct (1), with the horizontal length of the tapered expansion pipe b=2 / 3a, forming a bell-shaped opening cylindrical body; or, the inner wall diameter of the straight cylinder of the airflow duct (1) corresponding to the rear end position of the industrial camera body is D=2.5d, and the upper and lower lines of the cross section of the airflow duct (1) corresponding to the front position of the rear end position of the industrial camera body are B-spline curve structures, that is, the airflow duct (1) The starting point of the B-spline curve of the airflow movement pipe (1) corresponds to the rear end face of the industrial camera (3) body, and the curved surface is tangent to the straight pipe wall at this position. The B-spline curve of the airflow movement pipe (1) terminates at the front opening face of the airflow movement pipe (1). The first control point of the B-spline curve of the airflow movement pipe (1) is located at the corresponding position of the end face of the industrial camera lens. The vertical distance between the first control point and the axis of the airflow movement pipe (1) is 1 / 3a. The second control point of the B-spline curve of the airflow movement pipe (1) is located at the front 1 / 3a of the end face of the industrial camera (3) lens. The vertical distance between the second control point and the axis of the airflow movement pipe (1) is 1 / 3a+1mm. The end point of the B-spline curve is located at the front 2 / 3a of the end face of the industrial camera (3) lens. The vertical distance between the end point of the B-spline curve and the axis of the airflow movement pipe (1) is 4 / 9a.
4. The industrial camera dustproof device based on a flowing air curtain according to claim 3, characterized in that: The circumferential inner wall of the B-spline curve of the airflow duct (1) is uniformly distributed with eight spiral guide ribs (16) from the opening end inward. The rear end of each spiral guide rib (16) extends spirally to the rear end face of the corresponding industrial camera (3). The angle between the line connecting the point of any two adjacent spiral guide ribs (16) on the same vertical end face and the center point of the vertical end face is α, which is 45°. The angle between the projection of the line connecting the starting point of each spiral guide rib (16) and the center point of its vertical end face and the line connecting the ending point of the same spiral guide rib (16) and the center point of its vertical end face onto the starting point vertical end face is β, which is 45°.
5. The industrial camera dustproof device based on a flowing air curtain according to claim 4, characterized in that: The outer wall of the opening end of the airflow duct (1) is detachably fitted with an anti-turbulence shield (5). The anti-turbulence shield (5) includes an upper shield (51), a lower shield (52), and four connecting and fixing pieces (53). The upper shield (51) and the lower shield (52) are connected and fastened together. Their rear ends are fitted onto the outer wall of the airflow duct (1) at the position corresponding to the lens surface of the industrial camera (3). The four connecting and fixing pieces (53) are fixed in pairs on the left and right sides of the rear ends of the upper shield (51) and the lower shield (52). The two connecting and fixing pieces (53) of the upper half cover (51) and the lower half cover (52) are aligned on the same side to clamp and fix the pair of upper and lower contacting fastening connecting pieces (14) at the front of the alignment. The anti-turbulence cover (5) and the airflow movement pipe (1) are connected and fixed by fastening bolts (15). The horizontal distance between the opening end face of the anti-turbulence cover (5) and the opening end face of the airflow movement pipe (1) is 95mm-105mm, and the horizontal distance between the rear end face of the anti-turbulence cover (5) and the opening end face of the airflow movement pipe (1) is 45mm-55mm.
6. The industrial camera dustproof device based on a flowing air curtain according to claim 5, characterized in that: The upper half shell (11) of the airflow movement pipe (1) has a sliding sleeve (17) protruding at the position corresponding to the camera centering bracket (4). The camera centering bracket (4) has an inverted T-shaped structure, including a support surface (41) and a quadrangular prism rod (42). The lower end of the support surface (41) is detachably connected to the upper side wall of the industrial camera (3). The upper end of the support surface (41) is fixedly connected to the lower end of the quadrangular prism rod (42). The quadrangular prism rod (42) is slidably fitted into the sliding sleeve (17), and the upper end of the quadrangular prism rod (42) is exposed outside the upper end surface of the sliding sleeve (17). A horizontal pin (171) passes through the outer side wall of the sliding sleeve (17) and can be pressed and limited to fix the quadrangular prism rod (42). A gas flow display and regulating valve (6) is connected to the air inlet pipe (2).
7. A dustproof method, applied to an industrial camera dustproof device based on a flowing air curtain as described in any one of claims 1-6, characterized in that, The steps are as follows: S1. Install the airflow movement pipe (1) and the industrial camera (3). Coaxially fit the industrial camera (3) into the airflow movement pipe (1). Connect the air inlet pipe (2) and the gas flow display and regulating valve (6) at the end of the airflow movement pipe (1). S2. Depending on the disturbing wind force in the work environment, select and install a simple industrial camera dustproof device, a basic industrial camera dustproof device, an optimized industrial camera dustproof device, or an enhanced industrial camera dustproof device. S3. Conventional industrial compressed air is introduced into the air inlet pipe (2). The water vapor dew point of the compressed air is ≤-40℃, the particulate matter in the compressed air is ≤Class 2, the oil content in the compressed air is ≤0.1mg / m³, the flow rate of the compressed air is 0.00016kg / s, the pressure value of the compressed air is 0.4MPa, and the industrial camera (3) in the airflow pipe (1) is protected against dust.
8. A dustproof method according to claim 7, characterized in that, The specific operation of step S1 is as follows: First, connect the camera centering bracket (4) to the industrial camera (3); assemble and sleeve the upper half shell (11) of the airflow movement pipe (1) with the camera centering bracket (4), the vertical distance between the center line of the airflow movement pipe (1) and the upper edge of the sliding sleeve (17) is 80mm; the vertical distance between the lower end face of the support surface (41) of the camera centering bracket (4) and the upper end face of the quadrangular prism rod (42) is 100mm; the center distance between the lower end face of the support surface (41) and the axis of the industrial camera (3) is L1, the vertical distance between the upper edge of the sliding sleeve (17) and the upper end face of the quadrangular prism rod (42) is L2, then L2=100+L1-80=20+L1, after measurement, determine the value of the upper end of the quadrangular prism rod (42) of the camera centering bracket (4) exposed above the upper edge of the sliding sleeve (17) according to the value of L2, that is It can ensure that the industrial camera (3) is coaxially connected with the airflow pipe (1), tighten the horizontal pin (171), and fix the industrial camera (3) coaxially inside the airflow pipe (1); connect and screw the upper half shell (11) and lower half shell (12) of the airflow pipe (1) together, and seal the communication cable of the industrial camera (3) from the reserved hole at the rear of the airflow pipe (1) circumferentially; if it is necessary to install the anti-turbulence cover (5), connect and clamp the upper half cover (51) and lower half cover (52) of the anti-turbulence cover (5) to the outer wall of the airflow pipe (1) and screw it together; the front end of the air inlet pipe (2) is connected to the rear end of the pipe body connecting nozzle (13), and the air inlet pipe (2) is connected to the gas flow display regulating valve (6); connect the upper end of the camera centering bracket (4) to the external bracket and lock it.
9. A dustproof method according to claim 8, characterized in that, In step S2, when the disturbance wind force in the work scene is ≤1m / s, a simple industrial camera dustproof device is selected; when 1m / s < the disturbance wind force in the work scene is ≤2m / s, a basic industrial camera dustproof device is selected; when 2m / s < the disturbance wind force in the work scene is ≤3m / s, an optimized industrial camera dustproof device is selected. The airflow movement pipe (1) in the simplified industrial camera dustproof device is a straight cylinder with a consistent inner diameter from front to back, and the inner wall diameter of the airflow movement pipe (1) is D=2.5d; The airflow movement pipe (1) in the basic industrial camera dustproof device is a straight cylinder with the same inner diameter as the airflow movement pipe (1) at the rear end of the industrial camera lens. The inner wall diameter of the straight cylinder of the airflow movement pipe (1) at the rear end of the industrial camera lens is D=2.5d. The circumferential inner wall of the airflow movement pipe (1) starts from the front position of the industrial camera (3) lens end and expands outward at a six-degree angle with the rear circumferential inner wall of the airflow movement pipe (1). The horizontal length of the tapered expansion pipe is b=2 / 3a, forming a cylindrical body with a trumpet-shaped opening. In the optimized industrial camera dustproof device, the airflow duct (1) corresponding to the rear end face of the industrial camera (3) is a straight cylinder with the same inner diameter. The inner wall diameter of the straight cylinder of the airflow duct (1) corresponding to the rear end face of the industrial camera is D=2.5d. The upper and lower lines of the cross section of the airflow duct (1) corresponding to the front end face of the industrial camera (3) are B-spline curves. That is, the starting point of the B-spline curve of the airflow duct (1) corresponds to the rear end face of the industrial camera (3), and the curved surface is tangent to the straight cylinder wall at this position. The B-spline curve of the airflow duct (1) terminates at the front opening face of the airflow duct (1). The first control point of the B-spline curve of the airflow duct (1) is located at the corresponding position of the end face of the industrial camera lens. The vertical distance between the first control point and the axis of the airflow duct (1) is 1 / 3a. The second control point of the B-spline curve of the airflow duct (1) is located at the industrial camera (3). At the front 1 / 3a of the lens end face, the vertical distance between the second control point and the axis of the airflow movement pipe (1) is 1 / 3a+1mm; the endpoint of the B-spline curve is located at the front 2 / 3a of the industrial camera (3) lens end face, and the vertical distance between the endpoint of the B-spline curve and the axis of the airflow movement pipe (1) is 4 / 9a; the circumferential inner wall of the B-spline curve of the airflow movement pipe (1) is evenly distributed with eight spiral guide ribs (16) from the opening end inward, each spiral guide rib ( 16) The rear spiral extends to the rear end face of the corresponding industrial camera (3) body. The angle between the line connecting the point of each pair of adjacent spiral guide ribs (16) on any vertical end face and the center point of the vertical end face is α, which is 45°. The angle between the projection of the line connecting the starting point of each spiral guide rib (16) and the center point of its vertical end face and the line connecting the ending point of the same spiral guide rib (16) and the center point of its vertical end face onto the starting point vertical end face is β, which is 45°.
10. A dustproof method according to claim 9, characterized in that, In step S2, when 3m / s < the disturbance wind force of the working scene ≤ 5m / s, select the enhanced industrial camera dustproof device; The enhanced industrial camera dustproof device is based on the optimized industrial camera dustproof device, with an anti-turbulence hood (5) circumferentially fitted on the outer wall of the opening end of the airflow movement duct (1). The situation where the external airflow disturbance has the greatest impact is when the wind is perpendicular to the lens axis. At this time, the lens of the industrial camera (3) of the enhanced industrial camera dustproof device should face downwards and take pictures from top to bottom, with an acute angle between it and the horizontal plane. The angle range is 10°-45°, so as to effectively deal with the external air disturbance.