A method and device for automatically detecting spray paint

Abstract

The present invention discloses an automatic detection method and device for spraying paint, wherein the automatic detection method for spraying paint comprises the following steps: obtaining qualified specification parameters of a workpiece to be sprayed paint, and setting a detection error range according to the qualified specification parameters; using a detector to detect the actual specification parameters of the workpiece to be sprayed paint; comparing the actual specification parameters with the detection error range, and screening out qualified data in the actual specification parameters within the detection error range; determining the spraying area of ​​the workpiece to be sprayed paint according to the qualified data; obtaining displacement data of the workpiece to be sprayed paint, and determining that the workpiece to be sprayed paint has reached a spraying position according to the displacement data; obtaining position data of a spray gun on a spraying trolley, and determining that the spray gun has reached a spraying position according to the position data; and controlling the spray gun to open and spray paint in the spraying area. This solves the problem that the previous spraying device cannot judge and screen the detected data, which easily causes mis-spraying or leaking spraying, and cannot save paint to the maximum extent.

Description

Technical Field

[0001] The invention relates to the field of intelligent control of paint spraying, in particular to an automatic detection method and device for paint spraying. Background Art

[0002] Painting is the core of steel surface treatment. Currently, the existing detectors are usually reflective photoelectric sensors, which are not effective in detecting steel width. They are greatly affected by surface color and steel angle, and often cannot accurately identify steel width. When working conditions change, the detected data errors are large, and the erroneous data cannot be judged and identified. The accuracy error when controlling painting is large, which is easy to cause mis-spraying or missed spraying, and cannot save paint to the maximum extent.

[0003] In addition, the original reflective photoelectric sensor is a reflective plate switch. The detection distance and sensitivity are adjusted by the potentiometer on the switch. Only the size and direction are displayed. It is difficult for operators to adjust accurately. In addition, the different surface of the material also affects the reflective effect of the switch, which is very uncertain. Some sensors and spray gun switches are installed near the spray gun in the paint spraying environment, which is easy to cause pollution, thus affecting the detection data. Summary of the invention

[0004] In view of this, the present invention provides an automatic detection method and device for spraying paint to solve the problem that the reflective photoelectric sensor used in the past is affected by the surface color and angle of the workpiece, and cannot accurately identify the actual specification parameters such as the width of the workpiece during spraying paint, and cannot judge and screen the identified actual specification parameters, which easily causes misspraying or missed spraying, and cannot save paint to the maximum extent.

[0005] In a first aspect, the present invention provides an automatic detection method for spray painting, comprising: obtaining qualified specification parameters of a workpiece to be sprayed with paint, and setting a detection error range according to the qualified specification parameters;

[0006] Placing the material to be painted on a roller table, and using a detector to detect actual specification parameters of the workpiece to be painted;

[0007] Comparing the actual specification parameters with the detection error range, and screening out qualified data in the actual specification parameters that are within the detection error range;

[0008] Determining a painting area of ​​the workpiece to be painted according to the qualified data;

[0009] Acquiring displacement data of the workpiece to be painted, and determining that the workpiece to be painted has reached a painting position according to the displacement data;

[0010] Acquire position data of a spray gun on a paint spraying vehicle, and determine, based on the position data, that the spray gun has reached the paint spraying position;

[0011] When the workpiece to be painted reaches the painting position and the spray gun reaches the painting position, the spray gun is controlled to open and spray paint in the painting area.

[0012] Preferably, the method further comprises the steps of:

[0013] The equipment data that affects the accuracy of the painting position is obtained from the equipment used in the painting, and the painting position is compensated according to the equipment data.

[0014] Preferably, the qualified specification parameter is: the original width value of the workpiece to be painted;

[0015] The actual specification parameter is: the actual width value of the workpiece to be painted during detection.

[0016] In a second aspect, the present invention provides an automatic detection paint spraying device, comprising: a detector, a paint spraying trolley, a reciprocator and a controller;

[0017] The paint spraying trolley is installed on the reciprocating machine, and a first sensor for detecting position data of the paint spraying trolley is installed on the paint spraying trolley;

[0018] The paint spraying trolley is provided with a support arm, a spray gun of the paint spraying trolley is provided at one end of the support arm, the other end of the support arm is provided with the detector for detecting the actual specification parameters of the workpiece to be painted, and one end of the support arm provided with the spray gun is located inside the paint spraying room;

[0019] The workpiece to be painted is on a roller conveyor, and a second sensor for detecting displacement data of the workpiece to be painted is installed on the roller conveyor;

[0020] The controller is connected to the detector, the paint spraying vehicle, the first sensor and the second sensor respectively, and is used to determine the paint spraying area according to the actual specification parameters, and control the paint spraying vehicle to spray paint according to the position data and the displacement data;

[0021] The directions of both ends of the support arm are the same as the running direction of the roller, and the reciprocating machine is used to drive the paint spraying trolley to move. The moving direction of the reciprocating machine is perpendicular to the directions of both ends of the support arm and the running direction of the roller.

[0022] Preferably, the detector is: a laser sensor;

[0023] The laser sensor is fixed at the other end of the support arm, and the laser sensor is connected to the controller. The laser sensor is used to detect the actual specification parameters of the workpiece to be painted and transmit them to the controller.

[0024] Preferably, the paint spraying trolley is provided with a solenoid valve, and the paint spraying trolley and the spray gun are connected via the solenoid valve;

[0025] The controller is connected to the solenoid valve, and is used to control the opening or closing of the spray gun through the solenoid valve.

[0026] Preferably, it also includes: an alarm;

[0027] The alarm is connected to the controller.

[0028] The present invention has the following beneficial effects:

[0029] The present invention provides an automatic detection method and device for spray painting, so as to solve the problem that the reflective photoelectric sensor used in the past is affected by the surface color and angle of the workpiece when detecting the workpiece to be sprayed with paint, and cannot accurately identify the actual specification parameters such as the width of the workpiece when spraying paint, and cannot judge and screen the identified actual specification parameters, which easily causes misspraying or missed spraying, and cannot save paint to the maximum extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0031] Figure 1 The present invention is a flowchart of an automatic detection method for spray painting.

[0032] Figure 2 It is a front view of an automatic detection paint spraying device according to an embodiment of the present invention.

[0033] Figure 3 It is a left view of an automatic detection paint spraying device according to an embodiment of the present invention.

[0034] In the figure, 1-painting room, 2-laser sensor, 3-painting trolley, 4-support arm, 5-spray gun, 6-steel plate, 7-roller, 8-solenoid valve, 9-reciprocating machine. DETAILED DESCRIPTION

[0035] The present invention is described below based on embodiment, but it is worth noting that the present invention is not limited to these embodiments. In the detailed description of the present invention below, some specific details are described in detail. However, for the part not described in detail, those skilled in the art can also fully understand the present invention.

[0036] In addition, those skilled in the art should understand that the drawings are only provided to illustrate the purpose, features and advantages of the present invention, and the drawings are not actually drawn to scale.

[0037] At the same time, unless the context clearly requires otherwise, the words "include", "comprises" and similar words throughout the specification and claims should be interpreted as inclusive rather than exclusive or exhaustive; that is, the meaning is "including but not limited to".

[0038] Figure 1 FIG. 1 is a flow chart of an automatic detection method for spray painting according to an embodiment of the present invention. Figure 1 As shown, an automatic detection method for spray painting includes the steps of: obtaining qualified specification parameters of a workpiece to be sprayed with paint, and setting a detection error range according to the qualified specification parameters;

[0039] Place the material to be painted on the roller table and use the detector to detect the actual specification parameters of the workpiece to be painted;

[0040] Compare the actual specification parameters with the detection error range, and filter out qualified data in the actual specification parameters that are within the detection error range; determine the painting area of ​​the workpiece to be painted based on the qualified data; obtain the displacement data of the workpiece to be painted, and determine that the workpiece to be painted has arrived at the painting position based on the displacement data; obtain the position data of the paint trolley, and determine that the paint trolley has arrived at the painting position based on the position data of the paint trolley; when the workpiece to be painted arrives at the painting position and the paint trolley arrives at the painting position, control the paint trolley to spray paint in the painting area.

[0041] Step S01: obtaining qualified specification parameters of a workpiece to be painted, and setting a detection error range according to the qualified specification parameters.

[0042] In the present invention, the qualified specification parameter is: the original width value of the workpiece to be painted.

[0043] In the embodiment of the present invention, the workpiece to be painted may be a steel plate, and the original factory width of the steel plate is 0.3 meters. The error range during the test is set according to the qualified specification parameters, and the width error range is ±20mm. When the steel plate is rectangular, its width is consistent. If it is an irregular shape, the width of each position is different, and the error range needs to be set according to the width of its specific position.

[0044] Step S02: placing the material to be painted on a roller table, and using a detector to detect actual specification parameters of the workpiece to be painted.

[0045] In the present invention, the actual specification parameter is: the actual width value of the workpiece to be painted during detection.

[0046] In the embodiment of the present invention, in the actual production process, the steel plate is placed on the roller conveyor in the workshop and runs with the roller conveyor. When the steel plate runs to the bottom of the detector, the detector detects the steel plate. The detector will perform multiple groups of detections, and each group of detected data includes two data: the distance from the initial position of the detection to the left edge of the steel plate and the distance from the initial position of the detection to the right edge of the steel plate. The two data are subtracted to obtain the actual width value of the steel plate in the group of data. For example, when the first group of data is detected, the distance from the initial position of the detection to the right edge of the steel plate is 1.7 meters; the distance from the initial position of the detection to the left edge of the steel plate is 2 meters, then the actual width of the first group of detected steel plates can be obtained as 0.3 meters. When the steel plate moves on the roller conveyor and reaches the part below the detector, the detector detects the distance from the initial position of the detection to the left edge of the steel plate and the distance from the initial position of the detection to the right edge of the steel plate. According to the length of the steel plate, the number of detected data groups is different. The longer the steel plate, the more data groups.

[0047] Step S03: Compare the actual specification parameters with the detection error range, and select qualified data within the detection error range from the actual specification parameters.

[0048] In the embodiment of the present invention, after the detector detects multiple sets of actual width value data of the steel plate, there may be data with large deviations among the detected data due to too much detected data, and the detected data needs to be screened. The width data obtained by subtracting the detected data, i.e., the distance from the initial detection position to the left edge of the steel plate and the distance from the initial detection position to the right edge of the steel plate, is compared with the detection error range data, and the erroneous data beyond the detection error range is deleted, and finally five sets of data are retained.

[0049] Step S04: Determine the painting area of ​​the workpiece to be painted according to the qualified data.

[0050] In an embodiment of the present invention, the width data of the steel plate at different positions can be determined by screening the five groups of qualified data, so that the placement position and shape of the steel plate on the roller can be determined, and the area on the steel plate to be painted can be determined according to the position and shape. After the steel plate runs on the roller and is detected by the detector, it will arrive under the spray gun of the paint trolley inside the paint spraying room to be ready for painting in the paint spraying area. Due to the high data transmission speed and large data processing volume, erroneous data may appear in the five groups of screened data. Before painting, it is necessary to judge the five groups of data of the actual specification parameters of the screened steel plate, that is, whether they meet the qualified specification parameters of the steel plate. Even if one group meets the requirements, painting can be carried out normally. If none of the five groups meet the requirements, painting cannot be carried out.

[0051] Step S05: obtaining displacement data of the workpiece to be painted, and determining whether the workpiece to be painted has reached the painting position according to the displacement data;

[0052] In the embodiment of the present invention, when the steel plate runs on the roller, it will first pass under the detector. After the detector detects the width data of the workpiece to be painted, the steel plate continues to run to the painting position under the painting trolley. During the running process of the steel plate, the displacement data of the steel plate will be continuously obtained, and it is judged that the steel plate has run to the painting position under the painting trolley based on the displacement data.

[0053] Step S06: Acquire the position data of the painting trolley, and determine whether the painting trolley has reached the painting position according to the position data of the painting trolley;

[0054] Step S07: When the workpiece to be painted arrives at the painting position and the paint trolley arrives at the painting position, the spray gun is controlled to open and paint is performed in the painting area.

[0055] In an embodiment of the present invention, when the steel plate runs on the roller and reaches the position below the paint spraying trolley, the position data of the paint spraying trolley is obtained. When it is determined that the paint spraying trolley runs to the edge position on the left side of the steel plate, the paint spraying trolley is controlled to spray paint the steel plate from left to right.

[0056] The present invention also includes the steps of: acquiring equipment data that affects the accuracy of the paint spraying position in the equipment used during the paint spraying, and compensating the paint spraying position according to the equipment data.

[0057] In the embodiment of the present invention, in actual operation, in addition to the displacement of the steel plate on the roller table affecting the paint spraying position data, the opening speed of the electromagnetic valve of the spray gun, the oil pressure and flow rate of the paint spraying trolley, the spray gun placement angle, the paint resistance, the speed of the paint spraying trolley, etc., all these factors affect the paint spraying position data, so before painting, it is necessary to obtain the equipment data involved in the painting process that affects the accuracy of the paint spraying, and compensate the paint spraying position through these equipment data. Take the opening of the electromagnetic valve of the spray gun as an example, when the electromagnetic valve is opened and the electromagnetic valve is completely opened, it takes an action process time t1. When the moving speed of the paint spraying trolley is v at this time, the compensation distance s1 is s1=vt1 (calculated at a uniform speed). Through this distance s1, the paint spraying position data is corrected. For example, the original paint spraying position is: the steel plate is at the bottom of the detector as the starting point, and the position of 3 meters moving toward the spray gun is the paint spraying position, then the compensated paint spraying position = 3 meters-s1. Other compensation factors need to be given a comprehensive compensation amount based on actual conditions. The compensation amount is not fixed, but is adjusted according to the production line speed and specific conditions of the equipment.

[0058] The present invention provides an automatic detection method for spray painting. The actual specification parameters detected when spraying the paint material are compared and screened with the qualified specification parameters. The erroneous data in the detection data that are outside the detection error range are removed by screening, thereby ensuring the accuracy of calculating the spray painting area. When calculating the spray painting area, in each group of detection data, the minimum value is taken from the detection initial position to the left edge, and the maximum value is taken from the detection initial position to the right edge, thereby avoiding the phenomenon of missed spraying and wrong spraying due to the detection of too small a spray painting range. At the same time, it is judged whether the spray painting material running on the roller is consistent with the actual material to be sprayed. If it is consistent, the spray painting is carried out. If it is not consistent, the spray painting cannot be carried out, thereby avoiding the problem of paint waste caused by wrong spraying.

[0059] Figure 2 It is a front view of an automatic detection paint spraying device according to an embodiment of the present invention. Figure 3 1 is a left side view of an automatic detection paint spraying device according to an embodiment of the present invention. Figure 2 , Figure 3 As shown, an automatic detection paint spraying device comprises: a detector, a paint spraying trolley, a reciprocating machine and a controller; the paint spraying trolley is installed on the reciprocating machine, and a first sensor for detecting the position data of the paint spraying trolley is installed on the support arm of the paint spraying trolley; a support arm is installed on the paint spraying trolley, a spray gun of the paint spraying trolley is installed at one end of the support arm, and a detector for detecting the actual specification parameters of the workpiece to be painted is installed on the other end of the support arm, and the end of the support arm with the spray gun installed is inside the paint spraying room; the workpiece to be painted is on a roller, and a second sensor for detecting the displacement data of the workpiece to be painted is installed on the roller; the controller is respectively connected to the detector, the paint spraying trolley, the first sensor and the second sensor, and the controller is used to determine the paint spraying area according to the actual specification parameters, and control the paint spraying trolley to spray paint according to the position data and the displacement data; the direction of the two ends of the support arm is the same as the running direction of the roller, the reciprocating machine is used to drive the paint spraying trolley to move, and the moving direction of the reciprocating machine is perpendicular to the direction of the two ends of the support arm and the running direction of the roller.

[0060] In an embodiment of the present invention, the workpiece to be painted is a steel plate, and the actual specification parameters of the steel plate include: the width of the steel plate. When painting, the steel plate is placed on the roller of the workshop, and the steel plate moves at a uniform speed on the roller. When the steel plate runs from right to left under the detector, the detector detects the width of the steel plate and transmits it to the controller. The controller automatically calculates the painting area according to the width of the steel plate. When the steel plate runs on the roller, the second sensor detects the displacement data of the steel plate on the roller and transmits it to the controller. The controller judges that the steel plate runs to the bottom of the spray gun on the paint trolley inside the paint room according to the displacement data of the steel plate. At the same time, the first sensor installed on the reciprocating machine detects the position data of the paint trolley and transmits it to the controller. The controller judges that the paint trolley runs to the left edge of the steel plate according to the position data of the paint trolley. The controller controls the paint trolley to paint the steel plate in the painting area. Among them, the reciprocating machine is above the roller, driving the paint trolley to move back and forth horizontally, and the roller below moves longitudinally. The direction of the reciprocating machine moving back and forth is perpendicular to the direction of the roller. The first sensor and the second sensor are both position sensors.

[0061] In an embodiment of the present invention, the controller may be a programmable controller, and a system program is installed inside the controller, which is used to execute the acquisition of qualified specification parameters of the workpiece to be painted, and set the detection error range according to the qualified specification parameters; the controller is also used to obtain the actual specification parameters of the workpiece to be painted detected by the detector, that is, the steel plate width data, compare the actual specification parameters with the detection error range, screen out qualified data in the actual specification parameters that are within the detection error range, and determine the painting area of ​​the workpiece to be painted according to the qualified data.

[0062] In the present invention and Figure 2 , Figure 3 In the invention, the detector is a laser sensor; the laser sensor is fixed at the other end of the support arm, and the laser sensor is connected to the controller. The laser sensor is used to detect the actual specification parameters of the workpiece to be painted and transmit them to the controller.

[0063] In an embodiment of the present invention, when the steel plate runs on the roller and reaches under the laser sensor, the reciprocating machine drives the laser sensor to move back and forth laterally. One back and forth movement of the reciprocating machine is one stroke. The distance of each stroke of the laser sensor from the detection initial position to the first rising edge position of the steel plate is the distance data from the detection initial position to the left edge of the steel plate; the distance of the laser sensor from the detection initial position to the first falling edge position of the steel plate is the distance data from the detection initial position to the right edge of the steel plate.

[0064] When the steel plate moves on the roller, the reciprocating machine moves back and forth to drive the laser sensor to continuously detect the distance data of the steel plate below it and transmit it to the controller. The controller calculates the steel plate width data within the stroke based on the data of each stroke detected by the laser sensor, that is, the distance from the initial detection position to the right edge of the steel plate minus the distance from the initial detection position to the left edge of the steel plate is the steel plate width value. The controller screens the detected data, removes the erroneous data outside the detection error range, and automatically calculates the steel plate painting area based on the retained correct data.

[0065] In the present invention and Figure 2 , Figure 3 In the invention, a solenoid valve is provided on the paint spraying trolley, and the paint spraying trolley and the spray gun are connected through the solenoid valve; a controller is connected to the solenoid valve, and the controller is used to control the opening or closing of the spray gun through the solenoid valve.

[0066] In the embodiment of the present invention, the solenoid valve is used to control the opening or closing of the spray gun. When the steel plate moves to the bottom of the spray gun of the paint spraying trolley, the controller controls the solenoid valve to open, and the spray gun is used to spray paint on the spray area of ​​the steel plate. The controller is connected to the reciprocating machine, and the controller can adjust the spray area by controlling the opening time of the spray gun and the moving distance of the reciprocating machine.

[0067] The present invention also includes: an alarm, and the alarm is connected to the controller.

[0068] In an embodiment of the present invention, the programmable controller judges the steel plate data detected by the laser sensor. If the detected width data does not match the qualified specification parameters, or no data is detected within a set time, the programmable controller controls the alarm to sound an alarm.

[0069] In an embodiment of the present invention, when spraying paint, a steel plate is placed on a roller, and the steel plate moves with the roller to the bottom of the laser sensor. The reciprocating machine drives the laser sensor to move back and forth in a direction perpendicular to the running direction of the roller, drives the laser sensor to move back and forth, detects the distance between the left and right edges of the steel plate running under the laser sensor, and transmits it to the controller. The controller screens the transmitted data and determines the spraying area. The controller controls the solenoid valve to open and start spraying paint based on the displacement data of the steel plate reaching the bottom of the spray gun detected by the second sensor, and the spray gun of the spray carriage on the reciprocating machine reaching the left edge of the steel plate detected by the first sensor. When the first sensor detects that the spray gun of the spray carriage reaches the right edge of the steel plate, the controller controls the solenoid valve to close and stop spraying paint. The controller also determines that if the data detected by the laser sensor does not match the qualified steel plate width value, the controller controls the alarm to sound an alarm.

[0070] In an embodiment of the present invention, the controller is also used to obtain the opening speed of the spray gun valve, the oil circuit pressure and flow rate of the paint spraying cart, and the oil pipe cross-sectional area value, etc., and automatically calculate the error compensation distance of the paint spraying position, so that the paint spraying is more accurate.

[0071] The present invention adopts a laser sensor, which can set the detection distance, has strong directionality, high brightness, and good monochromaticity. Practice has proved that even if the angle of the bevel is 80 degrees, it can accurately return the signal. It has its own digital setting button and display screen, and the manual adjustment is accurate, the effect is stable and the accuracy is high, and precise control can be achieved. By setting the controller to calculate the regional data during painting, it is possible to accurately and quickly adjust according to the material of the paint material before painting, avoiding the disadvantages of the original empty spraying or using the adjustment steel plate to spray paint first and then adjust the production. For small-batch production or frequent replacement of paint materials, it can save a lot of time and manpower, and the economic benefits are significant. By pre-calculating the paint area and the paint position before painting, a large amount of raw materials can be saved, work efficiency is greatly improved, and the labor intensity of operators and human operating errors are reduced. By calculating the data such as the pressure and flow rate of the spray gun electromagnetic valve and the oil circuit of the paint trolley, the paint position data is compensated, making the painting more accurate.

[0072] The present invention also avoids the problems of poor sensitivity of the original reflective plate sensor, the paint switch and the detection equipment are installed in the paint environment near the spray gun, which are polluted by paint mist for a long time, affecting the detection data; the detection is easily affected by the structure of the equipment itself, such as roller racks, chains, etc., and the workpiece to be detected cannot be accurately identified. It is difficult for operators to make precise adjustments, and the difference in the surface of the material also affects the reflective effect of the switch, which has a large uncertainty. By setting a controller to process and analyze the actual specification parameters of the steel plate and the position of the paint trolley and other data, the actual paint spraying area and the paint spraying position are automatically calculated, which reduces the phenomenon of mis-spraying and missed spraying, and saves raw materials; the controller automatically controls the spray gun to open the paint spraying, realizes intelligent control of the paint spraying, thereby improving work efficiency and reducing the labor intensity of operators and human operation errors.

[0073] The above embodiments are only for expressing the implementation mode of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, several modifications, equivalent substitutions, improvements, etc. can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A method for automatically detecting spray painting, characterized in that: The following steps are involved: Obtaining qualified specification parameters of the workpiece to be painted, and setting a detection error range according to the qualified specification parameters; The painting trolley is installed on the reciprocating machine, and a support arm is installed on the painting trolley, and a detector for detecting the actual specification parameters of the workpiece to be painted is installed at the other end of the support arm; The workpiece to be painted is placed on a roller table, and the actual specification parameters of the workpiece to be painted are detected by a detector; the detector is: a laser sensor; The reciprocating machine drives the laser sensor to move back and forth in a direction perpendicular to the running direction of the roller table to perform multiple sets of detections. Each set of detected data includes: the distance from the initial position to the left edge of the workpiece to be painted and the distance from the initial position to the right edge of the workpiece to be painted; The actual specification parameters are compared with the detection error range, and qualified data within the detection error range are screened out from the actual specification parameters; that is, the width data obtained by subtracting the distance data from the initial detection position to the left edge of the workpiece to be painted and the distance data from the initial detection position to the right edge of the workpiece to be painted are compared with the detection error range data, and the erroneous data exceeding the detection error range are deleted, and finally five groups of qualified data are retained; Determining a painting area of ​​the workpiece to be painted according to the qualified data; Acquiring displacement data of the workpiece to be painted, and determining that the workpiece to be painted has reached a painting position according to the displacement data; Acquire position data of a spray gun on a paint spraying vehicle, and determine, based on the position data, that the spray gun has reached the paint spraying position; When the workpiece to be painted reaches the painting position and the spray gun reaches the painting position, controlling the spray gun to open and spray paint in the painting area; Before painting, determine whether the five groups of qualified data of the actual specification parameters screened out meet the qualified specification parameters of the workpiece to be painted. Even if one group meets the requirements, painting can be carried out normally. If all five groups do not meet the requirements, painting cannot be carried out.

2. The automatic detection method for spray painting according to claim 1, characterized in that: Also includes the steps: The equipment data that affects the accuracy of the painting position is obtained from the equipment used in the painting, and the painting position is compensated according to the equipment data.

3. The automatic detection method for spray painting according to any one of claims 1 to 2, characterized in that: The qualified specification parameters are: the original width value of the workpiece to be painted; The actual specification parameter is: the actual width value of the workpiece to be painted during detection.

4. The automatic detection method for spray painting according to claim 1, characterized in that: Also includes: Controller; The paint spraying trolley is equipped with a first sensor for detecting position data of the paint spraying trolley; The spray gun of the paint spraying trolley is installed at one end of the support arm, and one end of the spray gun is inside the paint spraying room; The workpiece to be painted is on a roller conveyor, and a second sensor for detecting displacement data of the workpiece to be painted is installed on the roller conveyor; The controller is connected to the detector, the paint spraying vehicle, the first sensor and the second sensor respectively, and is used to determine the paint spraying area according to the actual specification parameters, and control the paint spraying vehicle to spray paint according to the position data and the displacement data; The directions of both ends of the support arm are the same as the running direction of the roller, and the reciprocating machine is used to drive the paint spraying trolley to move. The moving direction of the reciprocating machine is perpendicular to the directions of both ends of the support arm and the running direction of the roller.

5. The automatic detection method for spray painting according to claim 4, characterized in that: The laser sensor is fixed at the other end of the support arm, and the laser sensor is connected to the controller. The laser sensor is used to detect the actual specification parameters of the workpiece to be painted and transmit them to the controller.

6. The automatic detection method for spray painting according to claim 4 or 5, characterized in that: The paint spraying trolley is provided with a solenoid valve, and the paint spraying trolley and the spray gun are connected via the solenoid valve; The controller is connected to the solenoid valve, and is used to control the opening or closing of the spray gun through the solenoid valve.

7. The automatic detection method for spray painting according to claim 6, characterized in that: Also includes: Alarm; The alarm is connected to the controller.

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