A high and low temperature environment visual detection camera constant temperature control method

Abstract

The application discloses a kind of high-low temperature environment visual detection camera constant temperature control method, it is related to visual detection camera temperature control technical field, lens module outside is equipped with gas steady flow type constant temperature device, the gas steady flow type constant temperature device includes steady flow generation component and steady flow temperature control component, the gas steady flow type constant temperature device is installed on the inner wall of shell, located the outside of lens module, steady flow generation component forms continuous steady flow on the surface of lens module, the steady flow temperature control component controls the temperature of continuous steady flow, and the temperature of lens module is controlled at 15-25 DEG C.The gas steady flow type constant temperature device is set outside lens module in the application, can form 15-25 DEG C dry continuous steady flow on the surface of lens module, make the picture of lens module shooting not be influenced by the picture deformation caused by the uncontrolled abnormal air current of detection target, make lens module be at relatively constant working temperature.

Description

Technical Field

[0001] This invention relates to the field of temperature control technology for visual inspection cameras, and in particular to a method for constant temperature control of visual inspection cameras in high and low temperature environments. Background Technology

[0002] Visual inspection cameras are mainly used in industrial inspection for image analysis and recognition, and visual inspection and judgment. They have functions such as color presence / absence discrimination, color area calculation, contour finding and positioning, object feature grayscale matching, color or grayscale intensity detection, object counting, size measurement, barcode / QR code recognition and reading, mechanical guide positioning, and character recognition.

[0003] Visual inspection cameras typically operate in industrial automation environments, performing visual inspections on targets. The lens is aimed at the target and takes real-time pictures, which are then used for motion tracking and positioning, defect feature recognition and quality inspection, object counting, and other purposes.

[0004] Due to the characteristics of industrial vision inspection, most of the targets are objects on automated production lines. Therefore, the lenses of vision inspection cameras are usually set vertically or obliquely downwards during the design process. However, the temperature of the inspection environment in industrial automation sites is uncertain and may change significantly due to adjustments in the production process. The changing temperature, especially when the high-temperature airflow emitted by the inspection target rises, can interfere with the vision inspection camera.

[0005] In existing technologies, temperature control of electronic components such as vision inspection cameras mainly focuses on the circuit board, that is, the heat dissipation of the camera chip, in order to ensure the chip performance of the vision inspection camera. However, the constant temperature control of the vision inspection camera lens is neglected. As a result, in the actual inspection process, the influence of hot or cold airflow can cause significant interference to the imaging of the vision inspection camera. Since this interference cannot be accurately eliminated by post-processing image processing algorithms when it is unpredictable, it will affect the inspection results, especially the accuracy of visual defect detection of small parts and other inspection targets. Summary of the Invention

[0006] To address the temperature control problem of visual inspection cameras, this invention provides a constant temperature control method for visual inspection cameras in high and low temperature environments. The technical solution is as follows:

[0007] A method for constant temperature control of a visual inspection camera in high and low temperature environments includes a visual inspection camera body, which comprises a housing, a PCB circuit board, and a lens module. The PCB circuit board and the lens module are fixedly installed inside the housing. The lens module captures images of the inspection target from below. A gas-stabilized temperature control device is installed on the outside of the lens module. The gas-stabilized temperature control device comprises a flow-generating component and a flow-stabilized temperature control component. The gas-stabilized temperature control device is installed on the inner wall of the housing, located outside the lens module. The flow-generating component forms a continuous constant flow on the surface of the lens module, and the flow-stabilized temperature control component controls the temperature of the continuous constant flow. The continuous constant flow controls the temperature of the lens module at 15-25℃.

[0008] Through the above technical solution, a gas flow stabilization and temperature control device is set on the outside of the lens module. Under the action of the flow stabilization component, a continuous flow can be formed on the surface of the lens module. The temperature of this continuous flow is 15-25℃. This continuous flow will form a stable airflow in front of the lens module, so that the image captured by the lens module will not be affected by the uncontrollable upward abnormal airflow of the detection target, which will cause image distortion or affect the feature judgment of the detection target. At the temperature setting of 15-25℃, as the continuous flow passes through the outer surface of the lens module, the temperature of the lens module can be stabilized at 15-25℃ after a period of time, so that the lens module is at the optimal working temperature.

[0009] Optionally, an air curtain device is provided between the detection target and the lens module. The air curtain device includes a bracket, an air compressor, a solenoid valve, and an air curtain row. The bracket is set on one side of the detection target. The high-pressure air outlet of the air compressor is connected to the air inlet of the air curtain row through the solenoid valve. The air curtain row has a set of air outlets. The air curtain row is installed on the bracket, and the bottom of the set of air outlets is located 10-20mm above the upper surface of the detection target.

[0010] With the above technical solution, in the application scenario of quality visual inspection in industrial production lines, especially in the food processing industry, the food that has just been heated is the inspection target. The steaming hot inspection target flows on the production line conveyor belt. When it enters the area under the lens module, if the air curtain device is not turned on, the high temperature and high humidity airflow rises and fills the space between the inspection target and the lens module. The inspection image captured by the lens module is likely to be distorted, or even some features may not be captured. This may greatly reduce the reliability of visual quality inspection.

[0011] With the air curtain device in place, the air compressor compresses the gas. When the solenoid valve is open, the high-pressure gas passes through the air curtain and fills a stable airflow between the target and the lens module, further avoiding the risk of image distortion caused by abnormal airflow.

[0012] Optionally, the air curtain device further includes a gas drying device and a dry gas buffer tank. The high-pressure gas outlet of the air compressor is connected to the air inlet of the gas drying device, the outlet of the gas drying device is connected to the air inlet of the dry gas buffer tank, and the outlet of the dry gas buffer tank is connected to the air inlet of the air curtain through a solenoid valve.

[0013] By using the above technical solution, a gas drying device and a drying gas buffer tank are set up so that the gas blown out by the air curtain device is dried gas, which minimizes the moisture between the detection target and the lens module and improves the clarity of the image captured by the lens module.

[0014] Optionally, the flow stabilizing component includes a drying gas circulation shell, a fan, a constant temperature drying chamber, a servo solenoid valve, and a flow stabilizing busbar. The drying gas circulation shell is wrapped around the outside of the housing, and a constant temperature drying gas circulation channel is formed between the drying gas circulation shell and the outer wall of the housing. The fan is installed inside the constant temperature drying gas circulation channel. The constant temperature drying chamber is installed on one side of the outer wall of the drying gas circulation shell. The air inlet is connected to the air outlet of the fan through a pipe to dry the gas delivered by the fan and control the temperature at 15-25℃. The air outlet of the constant temperature drying chamber is connected to the air inlet of the flow stabilizing busbar through a servo solenoid valve and a pipe. The flow stabilizing busbar is installed on one side of the lens module, and the direction of the air outlet is parallel to the surface of the lens module. The flow stabilizing busbar blows out a continuous flow at a speed of 1-2 m / s.

[0015] The constant flow temperature control component includes a first temperature sensor, a second temperature sensor, a third temperature sensor, and a microcontroller-based circuit board. The first temperature sensor is used to monitor the temperature value of the lens module, the second temperature sensor is used to monitor the air temperature value outside the drying gas circulation shell, and the third temperature sensor is used to monitor the temperature value at the detection target. The first, second, and third temperature sensors are respectively electrically connected to the microcontroller-based circuit board, which is electrically connected to the fan, the constant temperature drying oven, and the servo solenoid valve.

[0016] With the above technical solution, when the fan, constant temperature drying chamber, and servo solenoid valve are started, the fan continuously pumps circulating air into the constant temperature drying chamber. The constant temperature drying chamber dehumidifies the air and controls the temperature at 15-25℃. Finally, a continuous constant flow is blown out through the constant flow outlet. Under the guidance of the drying gas circulation shell, the continuous constant flow circulates continuously in the constant temperature drying gas circulation channel with minimal loss. When in direct contact with the lens module, the working temperature of the lens module is kept at 15-25℃. Under continuous operation, all components of the entire vision inspection camera body are within the constant temperature range of 15-25℃, ensuring that all components of the vision inspection camera body are at a suitable working temperature.

[0017] Each temperature sensor in the constant flow temperature control component monitors the temperature value at different locations, providing a basis for the microcontroller-based circuit board to control the switching and power of the fan, constant temperature drying oven, and servo solenoid valve.

[0018] Optionally, an arc-shaped airflow guide section is provided at the other end of the dry gas circulation shell where the fan is not installed. The arc-shaped airflow guide section guides the continuous steady flow blown out by the steady flow outlet to re-enter the constant temperature dry gas circulation channel.

[0019] Through the above technical solution, the arc-shaped airflow guide section can re-enter the continuous steady flow blown out by the steady flow outlet into the constant temperature drying gas circulation channel, and less constant temperature drying air will be lost in the circulation, thus reducing the power consumption of the constant temperature drying oven.

[0020] Optionally, the flow stabilizer is a cuboid with an air inlet at one end, a gas channel inside, and an air outlet slit on one side. The width of the air outlet slit is 0.3-0.5 mm, and the length is 30-100 mm.

[0021] The above technical solution uses a long, narrow air outlet slit to blow out a continuous and stable flow. The air outlet slit with a width of 0.3-0.5mm provides sufficient continuous and stable flow to support most of the dry, constant-temperature gas to return to the constant-temperature dry gas circulation channel to complete the circulation, without generating a whistling sound.

[0022] Optionally, the fan is a servo turbofan fan.

[0023] Through the above technical solution, the servo turbofan fan can perform stepless power adjustment under program control.

[0024] Optionally, after the current stabilization component is set up, the shooting angle of the lens module is greater than 130°.

[0025] The above technical solution ensures the shooting angle requirements of the lens module without affecting the constant temperature drying gas circulation in the constant temperature drying gas circulation channel.

[0026] Optionally, the specific method for constant temperature control of the visual inspection camera is as follows:

[0027] The temperature values ​​monitored by the first, second, and third temperature sensors are denoted as T1, T2, and T3, respectively. If T1 is greater than 25℃, less than 15℃, or |T2-T3|>5℃, the circuit board based on the microcontroller will control the start of the fan, servo solenoid valve, and constant temperature drying oven, respectively, and set the temperature of the constant temperature drying oven to 20℃.

[0028] Optionally, if the temperature T1 is greater than 25℃ or less than 15℃ after the fan and constant temperature drying oven have been turned on for more than 10 minutes, the circuit board based on the microcontroller will control the power of the fan and the flow rate controlled by the servo solenoid valve to make the constant flow outlet blow out a continuous constant flow at a speed of 2m / s. When 15℃≤T1≤25℃, the constant flow outlet will blow out a continuous constant flow at a speed of 1.5m / s.

[0029] With the above technical solution, if T1 is greater than 25℃, it means that the lens module temperature is too high; if T1 is less than 15℃, it means that the lens module temperature is too low; if |T2-T3|>5℃, it means that the temperature difference between the detection target and the ambient temperature is large. In all cases, it is necessary to turn on the start-up fan, servo solenoid valve and constant temperature drying oven to ensure that the lens module is at a relatively constant working temperature.

[0030] If T1 is still greater than 25℃ or less than 15℃ after the fan and constant temperature drying oven have been turned on for more than 10 minutes, the lens module can be brought to the working temperature of 15-25℃ as soon as possible by increasing the speed of the dry constant temperature air blown out by the constant flow vent.

[0031] In summary, the present invention has at least one of the following beneficial technical effects:

[0032] 1. A gas flow stabilizing and temperature-regulating device is installed on the outside of the lens module, which can form a dry and continuous stable flow of 15-25℃ on the surface of the lens module. This prevents the image captured by the lens module from being distorted by the uncontrollable upward abnormal airflow of the target being detected, or from affecting the feature judgment of the target being detected. After a period of time, the temperature of the lens module can be stabilized at 15-25℃, so that the lens module is in a relatively constant working temperature.

[0033] 2. An air curtain device is installed. After the high-pressure dry gas passes through the air curtain, it fills a stable airflow between the detection target and the lens module, further avoiding the risk of image distortion caused by abnormal airflow. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the gas flow stabilizing constant temperature device and the air curtain device used in this invention.

[0035] Figure 2 yes Figure 1 A magnified schematic diagram of the structure of region A;

[0036] Figure 3 This is a side view of the flow stabilizer structure of the present invention;

[0037] Figure 4 This is a cross-sectional view of the current-stabilizing bus of the present invention;

[0038] Figure 5This is a schematic diagram illustrating the electrical component connection principle of the gas flow stabilizing constant temperature device and the air curtain device used in this invention.

[0039] Explanation of reference numerals in the attached drawings: 11. Housing; 12. PCB circuit board; 13. Lens module; 21. Flow stabilization component; 211. Drying gas circulation shell; 2111. Arc-shaped airflow guide section; 212. Fan; 213. Constant temperature drying oven; 214. Servo solenoid valve; 215. Flow stabilization busbar; 2152. Gas channel; 2153. Gas outlet slit; 216. Constant temperature drying gas circulation channel; 221. First temperature sensor; 222. Second temperature sensor; 223. Third temperature sensor; 224. Microcontroller-based circuit board; 31. Bracket; 32. Air compressor; 33. Gas drying device; 34. Drying gas buffer tank; 35. Solenoid valve; 36. Air curtain; 100. Detection target. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings.

[0041] This invention discloses a method for constant temperature control of a visual inspection camera in high and low temperature environments.

[0042] Reference Figures 1-5 A method for constant temperature control of a visual inspection camera in high and low temperature environments includes a visual inspection camera body, which includes a housing 11, a PCB circuit board 12, and a lens module 13. The PCB circuit board 12 and the lens module 13 are fixedly installed inside the housing 11. The lens module 13 captures images of the inspection target 100 from below. A gas flow constant temperature device is provided on the outside of the lens module 13. The gas flow constant temperature device includes a flow generation component 21 and a flow temperature control component. The gas flow constant temperature device is installed on the inner wall of the housing 11, located on the outside of the lens module 13. The flow generation component 21 forms a continuous constant flow on the surface of the lens module 13. The flow temperature control component controls the temperature of the continuous constant flow. The continuous constant flow controls the temperature of the lens module 13 at 15-25℃.

[0043] A gas flow stabilization and temperature control device is installed on the outside of the lens module 13. Under the action of the flow stabilization generator 21, a continuous flow can be formed on the surface of the lens module 13. The temperature of this continuous flow is 15-25℃. This continuous flow will form a stable airflow in front of the lens module 13, so that the image captured by the lens module 13 will not be affected by the uncontrollable upward abnormal airflow of the detection target 100, which will cause image distortion or affect the feature judgment of the detection target 100. With the temperature setting of 15-25℃, as the continuous flow flows through the outer surface of the lens module 13, the temperature of the lens module 13 can be stabilized at 15-25℃ after a period of time, so that the lens module 13 is at the optimal working temperature.

[0044] An air curtain device is installed between the detection target 100 and the lens module 13. The air curtain device includes a bracket 31, an air compressor 32, a solenoid valve 35, and an air curtain row 36. The bracket 31 is set on one side of the detection target 100. The high-pressure air outlet of the air compressor 32 is connected to the air inlet of the air curtain row 36 through the solenoid valve 35. The air curtain row 36 has a set of air outlets. The air curtain row 36 is installed on the bracket 31, and the bottom of the set of air outlets is located 10-20mm above the upper surface of the detection target 100.

[0045] In industrial production lines, especially in the food processing industry, the food that has just been heated is the inspection target 100. The steaming hot inspection target 100 flows on the production line conveyor belt. When it enters the area under the lens module 13, if the air curtain device is not turned on, the high temperature and high humidity airflow rises and fills the space between the inspection target 100 and the lens module 13. The inspection image captured by the lens module 13 is likely to be distorted, or even some features may not be captured. This may greatly reduce the reliability of visual quality inspection.

[0046] With the air curtain device in place, the air compressor 32 compresses the gas. When the solenoid valve 35 is open, the high-pressure gas passes through the air curtain outlet 36 and fills a stable airflow between the detection target 100 and the lens module 13, further avoiding the risk of image distortion caused by abnormal airflow.

[0047] The air curtain device also includes a gas drying device 33 and a dry gas buffer tank 34. The high-pressure gas outlet of the air compressor 32 is connected to the air inlet of the gas drying device 33, the outlet of the gas drying device 33 is connected to the air inlet of the dry gas buffer tank 34, and the outlet of the dry gas buffer tank 34 is connected to the air inlet of the air curtain outlet 36 through a solenoid valve 35.

[0048] By setting up a gas drying device 33 and a drying gas buffer tank 34, the gas blown out by the air curtain device is dried gas, which minimizes the moisture between the detection target 100 and the lens module 13 and improves the clarity of the image captured by the lens module 13.

[0049] The constant flow generation assembly 21 includes a dry gas circulation shell 211, a fan 212, a constant temperature drying chamber 213, a servo solenoid valve 214, and a flow stabilizer 215. The dry gas circulation shell 211 is wrapped around the outside of the housing 11, and a constant temperature dry gas circulation channel 216 is formed between the dry gas circulation shell 211 and the outer wall of the housing 11. The fan 212 is disposed inside the constant temperature dry gas circulation channel 216, and the constant temperature drying chamber 213 is disposed within the dry gas circulation shell 211. On one side of the outer wall, the air inlet is connected to the air outlet of the fan 212 through a pipe to dry the gas delivered by the fan 212 and control the temperature at 15-25℃. The air outlet of the constant temperature drying chamber 213 is connected to the air inlet of the flow stabilizer 215 through the servo solenoid valve 214 and the pipe. The flow stabilizer 215 is set on one side of the lens module 13, and the direction of the air outlet is parallel to the surface of the lens module 13. The flow stabilizer 215 blows out a continuous flow at a speed of 1-2m / s.

[0050] The constant flow temperature control component includes a first temperature sensor 221, a second temperature sensor 222, a third temperature sensor 223, and a microcontroller-based circuit board 224. The first temperature sensor 221 is used to monitor the temperature value of the lens module 13, the second temperature sensor 222 is used to monitor the air temperature value outside the drying gas circulation shell 211, and the third temperature sensor 223 is used to monitor the temperature value at the detection target 100. The first temperature sensor 221, the second temperature sensor 222, and the third temperature sensor 223 are respectively electrically connected to the microcontroller-based circuit board 224 for communication. The microcontroller-based circuit board 224 is electrically connected to the fan 212, the constant temperature drying oven 213, and the servo solenoid valve 214 for control.

[0051] When the fan 212, the constant temperature drying chamber 213, and the servo solenoid valve 214 are started, the fan 212 continuously pumps circulating air into the constant temperature drying chamber 213. The constant temperature drying chamber 213 dehumidifies the air and controls the temperature at 15-25℃. Finally, a continuous flow is blown out through the flow stabilizer 215. Under the guidance of the drying gas circulation shell 211, the continuous flow circulates continuously in the constant temperature drying gas circulation channel 216 with minimal loss. When in direct contact with the lens module 13, the working temperature of the lens module 13 is kept at 15-25℃. Under continuous operation, all components of the entire visual inspection camera body are in a constant temperature range of 15-25℃, ensuring that all components of the visual inspection camera body are at a suitable working temperature.

[0052] Each temperature sensor in the constant flow temperature control component monitors the temperature value at different locations, providing a basis for the microcontroller-based circuit board 224 to control the switching and power of the fan 212, the constant temperature drying oven 213, and the servo solenoid valve 214.

[0053] An arc-shaped airflow guide section 2111 is provided at the other end of the dry gas circulation shell 211 where the fan 212 is not installed. The arc-shaped airflow guide section 2111 guides the continuous steady flow blown out by the steady flow outlet 215 to re-enter the constant temperature dry gas circulation channel 216.

[0054] The arc-shaped airflow guide section 2111 can re-enter the continuous steady flow blown out by the steady flow outlet 215 into the constant temperature drying gas circulation channel 216, resulting in less loss of constant temperature drying air during circulation and reducing the power consumption of the constant temperature drying chamber 213.

[0055] The flow stabilizer 215 is a cuboid with an air inlet at one end and an internal gas channel 2152. It has an air outlet 2153 on one side, with a width of 0.3-0.5 mm and a length of 30-100 mm.

[0056] A long, narrow air outlet slit 2153 is used to blow out a continuous and steady flow. The air outlet slit 2153, with a width of 0.3-0.5mm, provides sufficient continuous and steady flow to support most of the dry, constant-temperature gas to return to the constant-temperature dry gas circulation channel 216 to complete the circulation, without generating a whistling sound.

[0057] Fan 212 is a servo turbofan fan.

[0058] Servo turbofan fans can perform stepless power adjustment under program control.

[0059] After the current stabilization generator 21 is set up, the shooting angle of the lens module 13 is greater than 130°.

[0060] While ensuring the constant temperature drying gas circulation in the constant temperature drying gas circulation channel 216, the shooting angle requirements of the lens module 13 are guaranteed.

[0061] The specific method for constant temperature control of visual inspection cameras is as follows:

[0062] The temperature values ​​monitored by the first temperature sensor 221, the second temperature sensor 222, and the third temperature sensor 223 are denoted as T1, T2, and T3, respectively. If T1 is greater than 25℃, less than 15℃, or |T2-T3|>5℃, then the circuit board 224 based on the microcontroller controls the start of the fan 212, the servo solenoid valve 214, and the constant temperature drying oven 213, respectively, and sets the temperature of the constant temperature drying oven 213 to 20℃.

[0063] If the fan 212 and the constant temperature drying oven 213 have been turned on for more than 10 minutes, and T1 is greater than 25℃ or less than 15℃, then the circuit board 224 based on the microcontroller controls the power of the fan 212 and the flow rate controlled by the servo solenoid valve 214, so that the flow stabilizer 215 blows out a continuous constant flow at a speed of 2m / s. When 15℃≤T1≤25℃, the flow stabilizer 215 blows out a continuous constant flow at a speed of 1.5m / s.

[0064] If T1 is greater than 25℃, it means the temperature of lens module 13 is too high; if T1 is less than 15℃, it means the temperature of lens module 13 is too low; if |T2-T3|>5℃, it means the temperature difference between the detection target 100 and the ambient temperature is large. In all these cases, it is necessary to turn on the start-up fan 212, the servo solenoid valve 214 and the constant temperature drying oven 213 to ensure that the lens module 13 is at a relatively constant working temperature.

[0065] If T1 is still greater than 25°C or less than 15°C after the fan 212 and the constant temperature drying oven 213 have been turned on for more than 10 minutes, the lens module 13 can be brought to the working temperature of 15-25°C as soon as possible by increasing the speed of the dry constant temperature air blown out by the constant flow outlet 215.

[0066] The specific implementation principle of the constant temperature control method for a visual inspection camera in high and low temperature environments of the present invention is as follows:

[0067] The automated sausage production line is equipped with a vision inspection camera for image recognition-based quality inspection. Sausages that fail the quality inspection also need to be visually positioned and picked up by a robotic arm.

[0068] Since the sausage has just been grilled, its surface temperature is high. As the detection target 100, it will form high-temperature fog between the visual inspection camera body, which will interfere with the lens module 13 of the visual inspection camera body.

[0069] The temperature values ​​monitored by the first temperature sensor 221, the second temperature sensor 222, and the third temperature sensor 223 are denoted as T1, T2, and T3, respectively. At a certain time point, the temperature of T1 is 23℃, the temperature of T2 is 22℃, and the temperature of T3 is 35℃. At this time, |T2-T3|>5℃. Then, the circuit board 224 based on the microcontroller controls the start of the fan 212, the servo solenoid valve 214, and the constant temperature drying oven 213, and sets the temperature of the constant temperature drying oven 213 to 20℃.

[0070] Simultaneously, the air compressor 32 and the solenoid valve 35 are turned on. After the high-pressure gas passes through the air curtain 36, it fills a stable airflow between the detection target 100 and the lens module 13, further avoiding the risk of image distortion caused by abnormal airflow.

[0071] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for constant temperature control of a visual inspection camera in high and low temperature environments, wherein the visual inspection camera includes a visual inspection camera body, the visual inspection camera body includes a housing (11), a PCB circuit board (12) and a lens module (13), the PCB circuit board (12) and the lens module (13) are fixedly installed in the housing (11), and the lens module (13) captures images of the inspection target (100) downwards; characterized in that A gas flow constant temperature device is provided on the outside of the lens module (13). The gas flow constant temperature device includes a flow generating component (21) and a flow temperature control component. The gas flow constant temperature device is installed on the inner wall of the housing (11) and located on the outside of the lens module (13). The flow generating component (21) forms a continuous flow on the surface of the lens module (13). The constant temperature control method of the visual inspection camera includes: the flow temperature control component controls the temperature of the continuous flow, and the continuous flow controls the temperature of the lens module (13) at 15-25℃. An air curtain device is set between the detection target (100) and the lens module (13). The air curtain device includes a bracket (31), an air compressor (32), a solenoid valve (35), and an air curtain row (36). The bracket (31) is set on one side of the detection target (100). The high-pressure outlet of the air compressor (32) is connected to the air inlet of the air curtain row (36) through the solenoid valve (35). The air curtain row (36) is provided with a set of air outlets. The air curtain row (36) is installed on the bracket (31), and the bottom of the set of air outlets is located 10-20 mm above the upper surface of the detection target (100).

2. The constant temperature control method of visual inspection camera in high and low temperature environment according to claim 1, characterized in that: The air curtain device also includes a gas drying device (33) and a dry gas buffer tank (34). The high-pressure gas outlet of the air compressor (32) is connected to the air inlet of the gas drying device (33). The outlet of the gas drying device (33) is connected to the air inlet of the dry gas buffer tank (34). The outlet of the dry gas buffer tank (34) is connected to the air inlet of the air curtain outlet (36) through a solenoid valve (35).

3. The constant temperature control method of visual inspection camera in high and low temperature environment according to claim 1, characterized in that: The steady flow generating assembly (21) comprises a dry gas circulation shell (211), a fan (212), a constant temperature drying box (213), a servo electromagnetic valve (214) and a steady flow row (215), the dry gas circulation shell (211) is wrapped outside the shell (11), a constant temperature dry gas circulation channel (216) is formed between the dry gas circulation shell (211) and the outer wall of the shell (11), the fan (212) is arranged in the constant temperature dry gas circulation channel (216), the constant temperature drying box (213) is arranged on the outer wall of one side of the dry gas circulation shell (211), an air inlet is communicated with the air outlet of the fan (212) through a pipeline, the gas delivered by the fan (212) is dried, and the temperature is controlled to be 15-25 DEG C, the air outlet of the constant temperature drying box (213) is communicated with the air inlet of the steady flow row (215) through the servo electromagnetic valve (214) and the pipeline, the steady flow row (215) is arranged on one side of the lens module (13), the direction of the air outlet is parallel to the surface of the lens module (13), and the steady flow row (215) blows out a continuous steady flow with a speed of 1-2 m / s; The steady flow temperature control assembly comprises a first temperature sensor (221), a second temperature sensor (222), a third temperature sensor (223) and a single-chip microcomputer-based circuit board (224), the first temperature sensor (221) is used for monitoring the temperature value of the lens module (13), the second temperature sensor (222) is used for monitoring the air temperature value outside the dry gas circulation shell (211), and the third temperature sensor (223) is used for monitoring the temperature value at the detection target (100), the first temperature sensor (221), the second temperature sensor (222) and the third temperature sensor (223) are respectively electrically connected with the single-chip microcomputer-based circuit board (224) in communication, and the single-chip microcomputer-based circuit board (224) is respectively electrically connected with the fan (212), the constant temperature drying box (213) and the servo electromagnetic valve (214) in control.

4. The high and low temperature environment visual detection camera constant temperature control method according to claim 3, characterized in that: The other end of the dry gas circulation shell (211) is provided with an arc-shaped air flow guide section (2111) without the fan (212), the arc-shaped air flow guide section (2111) guides the continuous steady flow blown out by the steady flow row (215) to re-enter the constant temperature dry gas circulation channel (216).

5. The high and low temperature environment visual detection camera constant temperature control method according to claim 3, characterized in that: The steady flow row (215) is a cuboid, is provided with an air inlet at one end, is provided with a gas channel (2152) in the inside, and is provided with an air outlet slot (2153) at one side, the width of the air outlet slot (2153) is 0.3-0.5 mm, and the length is 30-100 mm.

6. The high and low temperature environment visual detection camera constant temperature control method according to claim 3, characterized in that: The fan (212) is a servo vane fan.

7. The high and low temperature environment visual detection camera constant temperature control method according to claim 3, characterized in that: After the steady flow generating assembly (21) is arranged, the shooting angle of the lens module (13) is greater than 130 DEG.

8. The constant temperature control method for visual inspection camera in high and low temperature environment according to any one of claims 1-7, characterized in that: The constant temperature control method of the visual detection camera is as follows: The temperature values monitored by the first temperature sensor (221), the second temperature sensor (222) and the third temperature sensor (223) are respectively denoted as T1, T2 and T3, if T1 is greater than 25℃, less than 15℃ or |T2-T3|>5℃, the single-chip microcomputer-based circuit board (224) controls the start of the fan (212), the servo solenoid valve (214) and the constant-temperature drying box (213) respectively, and sets the temperature of the constant-temperature drying box (213) to 20℃.

9. The high and low temperature environment visual inspection camera constant temperature control method according to claim 8, characterized in that: If the fan (212) and the constant-temperature drying box (213) are turned on for more than 10 minutes, and T1 is greater than 25℃ or less than 15℃, the single-chip microcomputer-based circuit board (224) controls the power of the fan (212) and the flow rate controlled by the servo solenoid valve (214) to make the steady flow row (215) blow a continuous steady flow with a speed of 2m / s, and when 15℃≤T1≤25℃, the steady flow row (215) blows a continuous steady flow with a speed of 1.5m / s.

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