Sand core dip-coating detection method and system

Abstract

The invention relates to the technical field of sand core dip-coating, in particular to a sand core dip-coating detection method and system. The dip-coating detection method comprises the following steps: dip-coating a sand core, and moving the dip-coated sand core to a detection station; acquiring a sand core image, acquiring a marking initial position matched with the sand core according to the sand core image, and moving the detection head to the marking initial position; the detection head moves from one side of the sand core to the other side of the sand core along a straight line, so that the reference plate and the scribing plate perform scribing on the sand core coating; and obtaining a sand core image after scribing, obtaining the number of scribed lines on the coating according to the sand core image, judging whether the number of the scribed lines is equal to a set number or not, and further detecting whether the wet thickness of the coating meets the requirement or not. Wet state thickness detection is carried out after the sand core is dip-coated and before the sand core is dried, so that the timeliness is improved, and the problem of casting scrapping caused by the delay of detection after drying is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of sand core dipping, and in particular to a sand core dipping detection method and system. Background Art

[0002] In the foundry industry, the production of sand cores is one of the key steps. Its quality directly affects the accuracy and integrity of the final casting, and the thickness of the material layer is crucial to the quality of the sand core and the sand sticking problem of the casting.

[0003] The coating density of the coating pool directly affects the dipping effect. If the coating density is too high or too low, the coating on the sand core will be too thick or too thin, which will lead to problems such as sand sticking to the casting. In addition, during the dipping process, as the number of sand cores dipped increases and the influence of factors such as coating volatilization and precipitation, the coating density will increase, affecting the thickness of the coating layer after the sand core is dipped, and will cause defects such as coating lumps. If the adhesion of the coating and the thickness of the coating are not measured, or the measurement process is too delayed and real-time monitoring cannot be achieved, coating lumps will occur, or the sand core will not be dipped strictly and the wrapping effect will be poor, causing sand sticking problems, affecting product quality. Summary of the invention

[0004] In view of the deficiencies in the prior art, an embodiment of the present invention aims to provide a sand core immersion detection method.

[0005] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A sand core dip coating detection method, comprising:

[0007] The sand core is dip-coated and the dip-coated sand core is moved to the inspection station;

[0008] Acquire a sand core image, acquire a marking initial position matching the sand core according to the sand core image, and move the detection head to the marking initial position, wherein a reference plate and a plurality of marking plates are arranged on the detection head, the lengths of the plurality of marking plates are different and are all shorter than the length of the reference plate, and the reference plate is tangent to the outer contour surface of the sand core without coating along the extension line of the sand core moving direction at the initial position;

[0009] The detection head moves from one side of the sand core to the other side of the sand core in a straight line, so that the reference plate and the scribing plate are scribing on the sand core coating;

[0010] The image of the sand core after being scribed is obtained, and the number of scribes on the coating is obtained according to the sand core image. It is determined whether the number of scribes is equal to the set number, and then whether the wet thickness of the coating meets the requirements is detected.

[0011] The embodiment of the present invention further provides a sand core dip coating detection system, comprising a transport line, a coating pool and a detection device, wherein the coating pool and the detection device are respectively arranged on both sides of the transport line;

[0012] The detection device includes a connecting seat, a connecting rod, an image acquisition device and a detection head, the rear end of the connecting rod is installed on the connecting seat, the image acquisition device is installed on the connecting rod, and the detection head is installed on the front end of the connecting rod. The detection head includes a reference plate and multiple drawing boards, the inner end of the reference plate and the inner ends of the multiple drawing boards are located on the same straight line, and the lengths of the multiple drawing boards are different and are all shorter than the length of the reference plate.

[0013] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0014] 1. By moving the detection head relative to the sand core, the surface of the sand core is scribed, and then the number of scribes is obtained to obtain the wet thickness of the coating. The coating density is adjusted in real time according to the coating thickness, so that the sand core coating will not be too thick or too thin due to uneven, too large or too small coating density, which will cause problems such as sand sticking to the casting, and the quality of the inner cavity of the casting is guaranteed. In addition, wet thickness detection after the sand core is dipped and before drying improves timeliness and avoids the problem of scrapped castings caused by delays in detection after drying.

[0015] 2. Use two-time dipping, and after the first dipping, the upper cover core is left facing down for a predetermined time. After the second dipping, the upper cover core is facing down for double-sided ash control to prevent paint nodules and uneven paint, reduce the impact of the number of strokes in wet thickness detection, and ensure thickness detection accuracy.

[0016] 3. According to the relationship between the coating thickness in wet and dry states, online detection from dry coating density to wet coating density is realized, which can quickly adjust the coating thickness in time, improve the timeliness of sand core coating thickness detection, and reduce the scrapping of castings caused by coating detection after drying.

[0017] 4. Two reference plates are set, and the two reference plates are located on both sides of the multiple-line plates. The reference plates can draw two upper and lower lines, which are used as identification lines. In the middle of the two identification lines, different numbers of lines are drawn for different coating thicknesses. Due to the setting of the reference plate, two upper and lower identification lines will inevitably be formed on the sand core, and the line corresponding to the coating thickness is located in the middle of the two identification lines. When identifying the number of lines, the line detection area can be quickly and accurately identified, which improves the efficiency of image recognition, reduces the interference of other factors, and improves the detection accuracy.

[0018] Advantages of additional aspects of the present invention will be given in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is an overall schematic diagram of the sand core dipping detection system provided in Example 1 of the present invention;

[0021] Figure 2 is a schematic diagram of a detection device provided in Example 1 of the present invention;

[0022] Figure 3 This is a front view of the detection device (excluding the detection robot) provided in Example 1 of the present invention;

[0023] Figure 4 is a top view of the detection device (excluding the detection robot) provided in Example 1 of the present invention;

[0024] Figure 5 It is a left view of the detection device (excluding the detection robot) provided in Example 1 of the present invention;

[0025] Figure 6 This is a schematic diagram of the installation of the detection head provided in Example 1 of the present invention;

[0026] Figure 7 is a front view of the detection head provided in Example 1 of the present invention;

[0027] Figure 8 is a top view of the detection head provided in Example 1 of the present invention;

[0028] Fig. 9 This is a schematic diagram of the dipping and drying process provided by Example 2 of the present invention;

[0029] Fig.10 is a schematic diagram of thickness detection provided by Example 2 of the present invention;

[0030] Fig.11 1 is a schematic diagram of the corresponding wet thickness and dry thickness provided in Example 2 of the present invention;

[0031] Fig.12 It is a matrix diagram of wet thickness and dry thickness provided in Example 2 of the present invention;

[0032] Fig.13 is a fitted line diagram of wet thickness and dry thickness provided in Example 2 of the present invention;

[0033] In the figure: 1, transport line; 11, inspection station; 2, core assembly station; 3, dip coating robot; 4, coating pool; 5, inspection device; 51, inspection robot; 52, connecting seat; 53, image acquisition device; 54, connecting rod; 541, groove; 55, inspection head; 551, reference plate; 552, marking plate; 553, mounting plate; 56, locking piece; 6, surface drying oven;

[0034] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0035] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] Terminology explanation:

[0037] Sand sticking: refers to the phenomenon that the molten metal penetrates into the gap between the sand or sand core grains and adheres to the surface of the casting, which may lead to the appearance quality of the casting and the scrapping of the casting. The formation of sand sticking is divided into two stages. The initial metal liquid penetrates into the pores to produce mechanical sand sticking, and then the infiltrated metal liquid is oxidized to form chemical sand sticking. Therefore, the sand sticking generally observed in production is a comprehensive sand sticking of mechanical penetration and chemical reaction.

[0038] Sand core: The material used to make the core in casting production is generally made of a certain proportion of molding materials such as casting sand, molding sand binder and additives. Most of the core is surrounded by high-temperature liquid metal in the mold, and the size of the supporting and positioning part is generally small. Therefore, in addition to the properties of general molding sand, the sand core is also required to have higher strength, permeability, yield and collapsibility.

[0039] Hot node: A node is an effect produced during the casting process. A casting hot node refers to a node or local area in the casting where the molten iron solidifies more slowly than the surrounding metal during the solidification process.

[0040] In order to make the provided technical solution clearer and easier to understand, the sand core dipping detection system is first explained.

[0041] Example 1

[0042] This embodiment proposes a sand core dip coating detection system, such as Figure 1As shown, it includes a transport line 1, a coating pool 4 and a detection device 5, and the coating pool 4 and the detection device 5 are respectively arranged on both sides of the transport line 1. The coating pool 4 adopts a constant liquid level overflow coating pool 4 on all sides to avoid deposition of the coating pool 4, and at the same time circulates and stirs to make each area of ​​the sand core surface evenly dipped.

[0043] like Figure 2 As shown, the detection device 5 includes a detection robot 51, a connection seat 52, a connection rod 54, an image acquisition device 53 and a detection head 55. The connection seat 52 can be detachably mounted on the detection robot 51, for example, by bolt connection. The detection robot 51 is a prior art, and is used to drive the image acquisition device 53 and the detection head 55 to move through the connection seat 52 and the connection rod 54. The image acquisition device 53 is a prior art, such as a camera. In addition, an alarm is also provided at the rear side of the image acquisition device 53, and a surface drying oven 6 for drying is provided at the end of the transport line 1.

[0044] like Figure 3 , Figure 4 , Figure 5 As shown, the rear end of the connecting rod 54 (i.e. Figure 3 The image acquisition device 53 is installed on the connecting rod 54, and the detection head 55 is installed on the front end of the connecting rod 54. Figure 6 , Figure 7 , Figure 8 As shown, the detection head 55 includes a reference plate 551 and a plurality of drawing plates, wherein the reference plate 551 is located on both sides of the plurality of drawing plates 552, and the inner end (i.e. Figure 7 The middle right end) and the inner ends of the plurality of drawing boards are located on the same straight line, and the lengths of the plurality of drawing boards are different and are all shorter than the length of the reference board 551.

[0045] Working principle: Before testing, first use the reference plate 551 for positioning, that is, the sand core that is not dipped in paint is moved to the testing station 11, and the detection head 55 is moved to make the outer end of the reference plate 551 contact the outer contour surface of the upper cover core of the sand core, and calibrate the coordinate value at this time, that is, the position where the coating is 0. In this embodiment, two reference plates 551 are set, and the two reference plates 551 are respectively located on both sides of the multiple scribing plates 552. The positioning accuracy is improved by the reference plates 551 on both sides, and the scribing lines formed by the other two reference plates 551 facilitate the area identification during the scribing detection, thereby improving the detection accuracy.

[0046] After the dip coating, the sand core moves to the inspection station 11. After the sand core is detected by the image acquisition device 53, the inspection head 55 moves to the initial position of the scribing (the line connecting the initial position of the scribing and the position where the coating is 0 is parallel to the conveying line direction), and then moves relative to the sand core in a direction parallel to the conveying line 1. The reference plate 551 scratches the coating on the sand core (upper cover core) to the surface of the sand core, and the scribing plate 552 scratches the coating of the sand core but does not touch the surface of the sand core. Since the coating on the upper cover core of the sand core does not affect the subsequent process, the scribing position in this embodiment selects the upper cover core of the sand core.

[0047] For example, the ruled board 552 has seven lines. Figure 6 As shown, it becomes shorter from top to bottom, and the distance from the outer end of the marking plate 552 to the outer end of the reference plate 551 is marked on each marking plate 552, that is, the coating thickness: 650μm, 600μm, 550μm, 500μm, 450μm, 400μm, 350μm.

[0048] When the wet coating thickness is 580μm, there are no scratches on the two 650μm and 600μm scribing plates 552. If the wet coating layer thickness is required to be 600μm, 6 lines need to be drawn (i.e., 6 lines are drawn on the scribing plate 552, and 2 lines are drawn on the reference plate 551, for a total of 8 lines. However, when calculating the coating thickness, the two lines drawn on the reference plate 551 are not included, and only the lines drawn on the scribing plate 552 are calculated). If 7 lines are detected, it means that the coating thickness is too thick, and the alarm displays a red alarm. If it is less than 6 lines, the alarm displays a yellow alarm, and the scale numbers are displayed on the display screen. The operator can confirm the alarm and adjust the coating density in time to ensure the consistency of the coating layer thickness.

[0049] By setting a detection device 5 on one side of the transport line 1, a wet thickness detection is performed after the sand core is dipped and before it is dried, wherein the detection head 55 includes a longer reference plate 551 and a shorter scribing plate 552 of unequal lengths. By moving the detection head 55 relative to the sand core, a line is drawn on the surface of the sand core, and then the number of lines is detected by the image acquisition device 53 to obtain the wet thickness of the coating. The coating density is adjusted in real time according to the coating thickness, so that the sand core coating will not be too thick or too thin due to uneven, too large or too small coating density, thereby causing problems such as sand sticking to the casting, thereby ensuring the quality of the inner cavity of the casting. In addition, the wet thickness detection after the sand core is dipped and before it is dried improves the timeliness and avoids the problem of scrapping the casting caused by the delay in detection after drying.

[0050] like Figure 7 As shown, a mounting plate 553 is provided at the rear end of the detection head 55, and the reference plate 551 and the marking plate 552 are both provided on the mounting plate 553. Figure 6As shown, the front end of the connecting rod 54 is a U-shaped fork rod. There is a groove 541 in the middle of the fork rod, and threaded holes are provided on the side of the fork rod. The threaded holes communicate with the groove 541. The rear end of the mounting plate 553 is inserted into the groove 541, and a locking member 56 is installed in the threaded hole and abuts against the connecting rod 54. Through the detachable connection between the detection head 55 and the connecting rod 54, different detection heads 55 can be selected according to different core models, so as to flexibly adapt to a variety of products.

[0051] In addition, the technical indicators of automobile engines are gradually improving. In order to meet the requirements of engine lightweight and thin-walled, higher requirements are put forward for the casting process of engine cylinder blocks. Among them, the cores are gradually becoming more complex and delicate, but higher quality requirements are imposed on the inner cavity of the cylinder block. Sintering-type sand sticking is likely to occur during mass production of cylinder blocks, and in severe cases, the water channels will be blocked.

[0052] Because cracks appear on the surface of the core due to the phase change of quartz sand under the thermal action of molten iron pouring, and the molten metal penetrates into the cracks to form vein defects. Also because of the high-temperature hot spots, there is enough heat to ensure that the temperature at the interface between the core and the molten iron is higher than the solidus temperature of iron. Once the molten metal penetrates, it will continue. Only when the front of the molten metal solidifies, the penetration will stop. Eventually, the molten iron penetrates through the core cracks or pores to the entire cross-section of the core, thus forming sintering-type sand sticking on the core. Therefore, processes such as core making and core assembly in the casting process play a very important role.

[0053] In the core dipping and detection system of this embodiment, a core assembly station 2 is set before core dipping. The dipping robot 3 is arranged between the core assembly station 2 and the coating tank 4, and dipping is carried out after the cores are assembled. The overall core assembly process can not only improve the dimensional accuracy of the casting, but also improve the inner cavity cleanliness through overall dipping. The inner cavity cleanliness of water channels and oil channels is improved through overall dipping, flash is eliminated, sand sticking is reduced, and the inner cavity quality is guaranteed.

[0054] Robot automated dipping production efficiently realizes continuous automated operations such as core blowing, spin coating, and conveying. At the same time, the coating tank 4 is automatically stirred, eliminating the need for manual labor, improving production efficiency, and saving labor costs; the dipping robot 3 can also pick up the cores placed on the core assembly fixture and place them on the core assembly table, saving the core assembly fixture and mechanical costs.

[0055] Embodiment 2

[0056] Based on the core dipping and detection system of Embodiment 1, this embodiment proposes a core dipping and detection method, as Fig. 9 shown, including:

[0057] S100 Coating mixing:

[0058] Insert the stirring head of the stirrer into the paint pool to the middle or lower area, start the stirrer and move it up and down to make the whole stir evenly. Prolong the stirring time in winter, gradually add water and stir. After stirring evenly, measure whether the density of the paint meets the requirements (different sand core paints have different densities, so the appropriate density needs to be set).

[0059] S200 assembles the prepared sand cores.

[0060] S300 sand core dip coating:

[0061] After the prepared sand core is assembled, the dipping robot clamps the entire sand core and immerses it in the coating pool for one dipping coating. The dipping time is 5 seconds. After the dipping coating is completed, the dipping fixture is lifted up, with the upper cover core facing down. After staying for 2 seconds, the sand core is placed in the coating pool for a second dipping coating for 2 seconds to ensure the coating thickness. The dipping fixture is lifted up, with the upper cover core facing down, and the coating is controlled at 45° on one side for 1 second and at 45° on the other side for 1 second, and then placed on the drying tray of the conveyor roller.

[0062] In the conventional sand core dipping method, the sand core is placed in the coating for dipping and then taken out, which is prone to defects such as coating aggregation, dripping marks, and unevenness. This embodiment adopts double dipping, and after the first dipping, the upper cover core is left outside with the upper cover facing downward for a predetermined time. After the second dipping, the upper cover core is facing downward for double-side ash control to prevent the generation of coating nodules and coating unevenness, which in turn affects the number of lines in the wet thickness detection and ensures the thickness detection accuracy.

[0063] The S400 coating robot moves the coated sand core to the inspection station, and the PLC outputs the in-place instruction (such as Fig.10 shown).

[0064] S500 Thickness Detection:

[0065] The S510 robot moves to the photo taking position with the camera to obtain the sand core image, obtains the initial position of the marking line matching the sand core according to the sand core image, and moves the detection head to the initial position of the marking line. The reference plate is tangent to the outer contour surface of the sand core without coating along the extension line of the sand core moving direction at the initial position.

[0066] The process of obtaining the initial position of the marking line matching the sand core according to the sand core image and moving the detection head to the initial position of the marking line includes:

[0067] S511 acquires the initial position of the marking line matching the sand core according to the sand core image, and moves the detection head to the initial position of the marking line, including:

[0068] S512 determines the sand core model according to the sand core image, and determines the original coordinate position X\Y\R through the sand core cover (i.e., obtains the initial position of the marking line that matches the sand core model according to the sand core model). And according to the sand core model, calls the corresponding sand core gridding program. Reads the detection head positioning coordinates (i.e., obtains the current position of the detection head), and moves according to the compensation data (moves the detection head to the initial position of the marking line according to the difference between the current position and the initial position of the marking line).

[0069] S520 completes the grid movement: the detection head moves along a straight line from one side of the sand core to the other side of the sand core, so that the reference plate and the scribing plate scribe the sand core coating.

[0070] Among them, the reference plate can be marked with two upper and lower lines, which are used as identification lines. In the middle of the two identification lines, different numbers of lines are drawn for different coating thicknesses. Due to the setting of the reference plate, two upper and lower identification lines will inevitably be formed on the sand core, and the line corresponding to the coating thickness is located in the middle of the two identification lines. When identifying the number of lines, the line detection area can be quickly and accurately identified, which improves the efficiency of image recognition, reduces the interference of other factors, and improves the detection accuracy.

[0071] The S530 camera moves to the detection and photography position to obtain the image of the sand core after being scribed. The number of scribe lines on the coating is obtained based on the sand core image (here only the number of scribe lines on the scribe plate, that is, the total number minus two), and it is determined whether the number of scribe lines is equal to the set number, and then the wet thickness of the coating is detected to meet the requirements.

[0072] S531 obtains historical wet thickness data and corresponding dry thickness data. Through wet thickness detection and dry thickness detection, the detection results are as follows: Fig.11 As shown. Through the correlation test, there is a corresponding relationship between the wet thickness and the dry thickness as shown in Fig.12 shown.

[0073] S532 obtains the corresponding relationship between the dry and wet thicknesses according to the plurality of groups of historical wet thickness data and the corresponding dry thickness data. By fitting analysis, a regression equation (such as Fig.13 As shown in the figure): dry thickness = -270.0 + 1.106 wet thickness, which can predict the dry thickness of the coating and provide data support for the wall thickness of the casting.

[0074] S533 obtains the wet thickness of the coating according to the set dry thickness of the coating, and obtains the number of scribing lines that meets the requirements according to the wet thickness.

[0075] According to the relationship between the coating thickness in the wet state and the dry state, the online detection from the dry coating density to the wet coating density is realized, which can quickly realize the timely adjustment of the coating thickness, improve the timeliness of the sand core coating thickness detection, and reduce the scrapping of castings caused by the coating detection after drying.

[0076] If the actual number of lines drawn is not equal to the required number of lines drawn, S540 will give an alarm and adjust the coating density. For example, if 6 lines are required and 7 lines are detected, the alarm will display a red alarm, indicating that the coating thickness is too thick and manual intervention is required to adjust the coating density. If it is less than 6 lines, the alarm will display a red alarm, indicating that the coating thickness is too small and manual intervention is required to adjust the coating density. Through online alarm, the coating density meets the process requirements and reduces the fluctuation of sand sticking to the casting.

[0077] S550 is dried in a surface drying kiln to ensure that the sand core coating is dried.

[0078] The surface drying furnace is turned on for heating for 120 minutes. The roller temperature can be started only when the actual temperature of the heating zone reaches the set temperature of 200±20℃, so that the sand core gradually passes through the surface drying furnace for overall drying. The effective drying time of the core tray in the surface drying furnace is 80-100 minutes, ensuring that the residual moisture of the sand core is ≤0.6%. After drying, the surface quality of the sand core is checked to ensure that the surface coating of the sand core has no peeling or cracking. After that, the qualified sand core is transported to the vertical warehouse for storage.

[0079] The sand core dipping method changes the original process of separate dipping, prevents different sand cores from failing to reach the dipping time and coating density, resulting in poor surface quality, improves coating density adjustment, increases dipping time, and improves ash control technology. It cancels the dipping and drying of a single sand core, and determines the drying time and temperature after the overall dipping. It realizes automatic detection and automatic alarm, can achieve real-time adjustment, and reduces the problem of coating density detection after drying being too far from the source.

[0080] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A sand core dip coating detection method, It is characterized in that include: The sand core is dip-coated and the dip-coated sand core is moved to the inspection station; Acquire a sand core image, acquire a marking initial position matching the sand core according to the sand core image, and move the detection head to the marking initial position, wherein a reference plate and a plurality of marking plates are arranged on the detection head, the lengths of the plurality of marking plates are different and are all shorter than the length of the reference plate, and the reference plate is tangent to the outer contour surface of the sand core without coating along the extension line of the sand core moving direction at the initial position; The detection head moves from one side of the sand core to the other side of the sand core in a straight line, so that the reference plate and the scribing plate are scribing on the sand core coating; The image of the sand core after being scribed is obtained, and the number of scribes on the coating is obtained according to the sand core image. It is determined whether the number of scribes is equal to the set number, and then whether the wet thickness of the coating meets the requirements is detected.

2. The sand core dip coating detection method according to claim 1, It is characterized in that Acquiring the initial position of the marking line matching the sand core according to the sand core image, and moving the detection head to the initial position of the marking line includes: The sand core model is determined according to the sand core image, the initial position of the marking line matching the sand core model is obtained according to the sand core model, the current position of the detection head is obtained, and the detection head is moved to the initial position of the marking line according to the difference between the current position and the initial position of the marking line.

3. The sand core dip coating detection method according to claim 1, It is characterized in that Before the sand core is dipped and coated, the sand core is assembled first, and the sand core is dried after the thickness is tested.

4. The sand core dip coating detection method according to claim 1, It is characterized in that Sand core dipping includes: The sand core is immersed in the coating for a first predetermined time. After the dipping is completed, the sand core is lifted up, and the upper cover core is facing downward and stayed for a second predetermined time. The sand core is immersed in the coating for a second time, and the dipping is completed for a third predetermined time. After the dipping is completed, the sand core is lifted up, and the upper cover core is facing downward and the ash is controlled on both sides for a third predetermined time.

5. The sand core dip coating detection method according to claim 1, It is characterized in that The wet thickness of the coating is obtained according to the set dry thickness of the coating, and the number of scribing lines that meets the requirements is obtained according to the wet thickness.

6. The sand core dip coating detection method according to claim 5, Features: Obtain historical wet thickness data and corresponding dry thickness data; Obtaining a corresponding relationship between the wet and dry thicknesses according to the plurality of groups of historical wet thickness data and the corresponding dry thickness data; The wet thickness of the coating is obtained according to the set dry thickness of the coating.

7. The sand core dip coating detection method according to claim 5, It is characterized in that Determine whether the number of lines drawn is equal to the set number. If the actual number of lines drawn is not equal to the required number of lines drawn, an alarm is triggered.

8. The sand core dip coating detection method according to claim 7, It is characterized in that If the actual number of strokes does not equal the required number of strokes, adjust the paint density.

9. A sand core dip coating detection system, It is characterized in that It includes a transport line, a coating pool and a detection device, wherein the coating pool and the detection device are respectively arranged on both sides of the transport line; The detection device includes a connecting seat, a connecting rod, an image acquisition device and a detection head, the rear end of the connecting rod is installed on the connecting seat, the image acquisition device is installed on the connecting rod, and the detection head is installed on the front end of the connecting rod. The detection head includes a reference plate and multiple drawing boards, the inner end of the reference plate and the inner ends of the multiple drawing boards are located on the same straight line, and the lengths of the multiple drawing boards are different and are all shorter than the length of the reference plate.

10. The sand core dip coating detection system according to claim 9, It is characterized in that A mounting plate is provided at the rear end of the detection head, and the reference plate and the marking plate are both arranged on the mounting plate. The front end of the connecting rod is a U-shaped fork rod, and a groove is provided in the middle of the fork rod. A threaded hole is provided on the side of the fork rod, and the threaded hole is communicated with the groove. The rear end of the mounting plate is inserted into the groove, and a locking piece is installed in the threaded hole to press against the connecting rod.

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