Automatic coating design of low-pressure casting machine shell spiral sand core coating robot

Abstract

The invention discloses a low-pressure casting machine shell spiral sand core coating robot automatic coating design which comprises a workpiece conveying system, a robot execution system and a sand core coating coating system. The robot execution system is used for taking down the sand core from the workpiece conveying system and transferring the sand core into the sand core paint coating system, and the sand core paint coating system is used for coating sand core parts; the workpiece conveying system comprises a suspension chain guide rail, guide rail supports and an identifying and positioning device, the suspension chain guide rail is supported by the multiple guide rail supports, and the identifying and positioning device is arranged on the guide rail supports. Damage to sand core parts in the conveying process is reduced through suspension type conveying, a high-precision mechanical arm and an intelligent sensor are integrated, and the machine vision technology is fused, so that the robot can accurately recognize and stably clamp sand cores; and a series of complex actions including clamping, transferring to a coating area and accurately coating the paint are executed.

Description

Technical Field

[0001] The invention relates to the technical field of sand core dip coating, and more specifically to a design for automatic coating of spiral sand core coating by a robot for a low-pressure casting casing. Background Art

[0002] With the increasing global awareness of environmental protection and the transformation of energy structure, new energy vehicles, especially electric vehicles, play an important role in promoting the green development of the automotive industry. Electric vehicles rely on efficient power systems. As a key component that directly converts electrical energy into mechanical energy, electric motors need to operate at higher power density and longer continuous working time, resulting in a large amount of heat energy generated inside the motor. If this heat cannot be dissipated in a timely and effective manner, it will cause the motor temperature to rise, causing a series of problems, restricting the power output, driving stability and overall endurance of electric vehicles. At present, the industry widely uses low-pressure casting aluminum alloy technology to manufacture water-cooled motor casings to dissipate heat, that is, a hollow spiral water channel is embedded in the inner wall of the casing cylinder for access to circulating coolant, and the circulating coolant is used to take away the heat generated during the operation of the motor, achieving efficient and stable heat dissipation and ensuring the efficient operation of the motor. The complex internal structure of this circulating cooling system relies on the molding of high-precision sand cores. These sand cores must withstand thermal shock from aluminum alloy melt of up to 710°C during the casting process. In order to enhance the tolerance of the sand cores in high-temperature environments, a layer of graphite coating must be evenly applied to the surface of each sand core to build a solid protective barrier to resist the direct impact of high-temperature aluminum alloy liquid and prevent the sand core from cracking or damage. It can also effectively reduce the roughness of the sand core surface, strengthen the integrity of the sand mold structure, and improve the overall quality of the casting.

[0003] At present, the coating application method commonly used in the industry still relies on the traditional manual operation mode, that is, workers manually immerse the sand cores into the paint bucket one by one and stir and apply. This manual operation mode not only increases the labor intensity of workers, but also is difficult to meet the high-efficiency needs of modern production due to its inefficiency. More importantly, manual operation is difficult to ensure uniform coverage of the paint and the stability of the coating quality, resulting in difficulty in ensuring product quality. In addition, after the spiral sand core is prepared and formed, it often presents a semi-circular arch structure. Its inherent structural characteristics limit its strength, making it very easy to be damaged during frequent manual handling. This not only further reduces production efficiency, but also aggravates the instability of product quality. Summary of the invention

[0004] The present invention aims to overcome at least one defect of the above-mentioned prior art and provides a design for automatic robot coating of spiral sand core coating of low-pressure casting casing, which is used to solve the problems that sand core coating relies on manual labor, is prone to uneven coating and is easily damaged during handling.

[0005] The technical solution adopted by the present invention is a design for automatic coating of spiral sand core coatings by a robot for a low-pressure casting casing, comprising a workpiece conveying system, a robot execution system and a sand core coating coating system, wherein the workpiece conveying system is used to suspend and convey sand core parts, the robot execution system is used to remove sand cores from the workpiece conveying system and transfer them to the sand core coating coating system, and the sand core coating coating system is used to coat sand core parts; the workpiece conveying system comprises a hanging chain guide rail, a guide rail bracket, and an identification and positioning device, the hanging chain guide rail is supported by a plurality of guide rail brackets, and the identification and positioning device is arranged on the guide rail bracket.

[0006] By analyzing the irregular shape of the sand core parts, it is concluded that it can be transported flat on a transport fixture to avoid damage to it. At the same time, due to the special shape of the sand core parts and the fragility of the raw materials used to make the sand core parts themselves, they cannot be transported by belt conveyors. According to the analysis of the properties of the sand core parts, it is known that the mass of the sand core is about 2.232KG, which is a small weight object, so the suspension conveyor chain of the assembly line is used. Since the suspension conveyor chain of the equipment is transported by hanging workpieces, it reduces the excessive contact between the surface of the sand core parts and the conveyor belt, which can minimize the damage to the surface of the sand core parts. The identification and positioning device is based on robot visual recognition technology. It is used to mark and locate the sand core parts during the sand core transmission process to detect the position of the sand core parts. The visual image function is used to identify whether there is a sand core on the suspension chain guide rail and whether the position of the sand core is correct.

[0007] The identification and positioning device is composed of an industrial camera and a control box. The industrial camera is located on the crossbar of the guide rail bracket, and the control box is set on one of the guide rail brackets. According to the layout requirements of the system architecture, the industrial camera is installed on the crossbar of the guide rail bracket, which does not affect the transportation of sand cores by the suspension chain guide rail, the industrial robot takes and transfers sand cores, and can also well photograph whether the parking position of the sand core on the sand core suspension chain guide rail is correct. The industrial camera has excellent imaging performance and precise positioning capabilities, and can quickly capture the parking moment of the sand core on the suspension chain guide rail, realize instant and accurate judgment of the correctness of the sand core parking position, and improve the automation level and operation efficiency of the production line.

[0008] In order to minimize the loss of sand core parts during transportation and avoid unnecessary damage that may lead to the scrapping of sand core parts, the workpiece conveying system also includes a hanger, a drive motor, a lubrication device, a spring tensioning device and a buzzer. The hanger is suspended under the suspension chain rail, the drive motor, the lubrication device and the spring tensioning device are arranged on the suspension chain rail, and the buzzer is arranged on the rail bracket. The two lubrication devices on the suspension chain rail lubricate the chain links of the suspension chain rail that operates for a long time to prevent excessive friction at the connection between the chain links, which may cause damage and scrapping of parts. When the industrial camera captures that there is no sand core part in the hanger, the buzzer is triggered and the equipment enters a pause state. After the worker puts the sand core on the hanger and restarts the control box, the equipment enters a normal operation state.

[0009] In order to ensure that the sand core is fixed on the hanger according to the standard, the hanger includes a connecting rod, a boss and a limit device, the connecting rod is connected to the suspension rail, the boss is connected to the connecting rod, and the limit device is connected under the boss. The boss and the limit device are used to ensure that when the sand core is placed, the position of the sand core part is located at the predetermined coordinate.

[0010] In order to reduce the floor space of the equipment as much as possible and save the space in the working area, the robot execution system includes an industrial robot and an end effector. The industrial robot is located on one side of the suspension chain guide rail, and the end effector is located at the end of the mechanical arm of the industrial robot. Through the analysis of the mass and load of the sand core parts, the ABB IRB 2600ID industrial robot is selected to carry out the clamping and transfer of the sand core. The weight of the sand core parts is about 2.232 kg, and the load of the ABB IRB 2600ID industrial robot reaches 15 kg, which can meet the handling of the sand core parts. In addition, the IRB 2600ID industrial robot has high rigidity and strength, a small floor space, and can save the space in the working area. The ABB-IRB2600 series original servo motor 3HAC030216-003 is selected as the drive motor to reduce the occurrence of production and processing accidents caused by the robot drive motor in the future, and the unmatched robot drive motor will affect the operation efficiency of the ABB IRB2600 robot.

[0011] According to the appearance characteristics and weight of the spiral sand core, a special clamp is designed. The end effector includes a finger cylinder and a flange plate. The flange plate is connected to the mechanical arm of the industrial robot, and the finger cylinder is connected to the flange plate. The finger cylinder model selected is MHZ2-40D, whose outer diameter clamping force is 254N and inner diameter clamping force is 318N, which meets the clamping requirements of the spiral sand core in various situations and ensures the stability and safety of the clamping process. In order to further improve the stability of clamping, the end effector adopts a dual cylinder layout, that is, two MHZ2-40D finger cylinders of the same model are selected to work in parallel, which not only effectively disperses the clamping force and avoids sand core damage caused by excessive force at a single point, but also achieves a more uniform and reliable clamping effect on the spiral sand core through the synchronous action of the dual cylinders, thereby greatly improving the accuracy and stability of the clamping operation.

[0012] In order to avoid uneven coating when the robot clamps the sand core for coating, the sand core coating system includes a coating box, a sand core placement base and a stirring blade. The coating box is located on the right side of the industrial robot, the sand core placement base is located at one end of the coating box, and the stirring blade is located at the other end of the coating box. In order to facilitate the end effector of the industrial robot to transfer the sand core parts to the coating box, the coating box is made into a structure with an upper end opening, and the upper end opening structure is convenient for adding graphite coating to the coating box. Considering that the graphite coating will partially settle when it is left still, the surface of the sand core parts cannot be fully coated or uneven coating occurs; a rotary drive motor is designed to drive the stirring blade to stir the graphite coating in the coating box, so that the viscosity of the graphite coating in each part of the coating box remains relatively consistent. Since the industrial robot clamps the sand core parts and puts them into the coating box for coating, it will be difficult for the coating to penetrate the surface of the sand core parts through the gap between the end effector and the sand core parts, so a sand core placement base set for the irregular shape of the sand core parts is installed at the bottom of the coating box. The sand core parts are placed in it through the end effector of the industrial robot, and wait for 2 to 3 seconds. The graphite coating is fully contacted with the surface of the sand core parts through the stirring blades driven by the motor. Finally, the end effector of the industrial robot takes out the finished product, transfers it to the hanger of the hanging conveyor chain, and transfers it to the next processing station.

[0013] In order to monitor the content of the paint in the paint coating box in real time, the paint coating system further includes a water level sensor, which is used to detect the liquid level of the paint in the paint coating box. When the liquid level of the paint is lower than a certain amount during the paint coating process, it will be fed back to the system.

[0014] In order to issue a reminder when it is detected that the paint is too little, the paint coating system also includes a buzzer, which is used to alarm when the water level sensor detects that the liquid level in the paint coating box is lower than a preset value.

[0015] The coating system further comprises a rotary drive motor, which is located at the bottom of the coating box. The rotary drive motor drives the gear of the stirring blade to rotate by rotating the gear, and the stirring blade stirs the graphite coating in the coating box, so that the surface of the sand core part is fully and evenly covered with the graphite coating.

[0016] Compared with the prior art, the beneficial effects of the present invention are mainly reflected in the following aspects: 1. Reduce the damage to sand core parts during transportation By analyzing the irregular shape of the sand core parts, it is found that placing them flat on a transport fixture for transportation can avoid damage to them. Due to the special shape of the sand core parts and the fragility of the raw materials used to manufacture the sand core parts, a suspension conveyor chain of the assembly line is used. The suspension conveyor chain suspends the workpiece for transportation, thereby reducing the excessive contact between the surface of the sand core parts and the conveyor belt, which can minimize the damage to the surface of the sand core parts. This equipment realizes seamless docking and efficient transmission of the sand core from the initial position to the coating station by controlling the suspension conveyor chain system driven by the motor.

[0017] 2. Use machine vision technology for accurate identification The equipment not only integrates high-precision robotic arms and intelligent sensors, but also deeply integrates advanced machine vision technology, enabling the robot to accurately identify and firmly clamp each sand core, and perform a series of complex actions including clamping, transferring to the coating area, and accurately coating the paint. This process completely abandons the traditional manual painting method, reduces manual intervention, and reduces labor intensity. It not only significantly improves work efficiency, but also ensures the uniformity and consistency of paint coating, thereby greatly improving the production quality and stability of sand cores. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the present invention.

[0019] Figure 2 It is a structural diagram of the workpiece conveying system of the present invention.

[0020] Figure 3 It is a structural diagram of the sling of the present invention.

[0021] Figure 4 It is a structural diagram of the boss of the sling of the present invention.

[0022] Figure 5 It is a structural diagram of the identification device of the present invention.

[0023] Figure 6 It is a structural diagram of the robot execution system of the present invention.

[0024] Figure 7 This is a structural diagram of the end effector of this aspect.

[0025] Figure 8 It is a structural diagram of the sand core coating system part of the present invention.

[0026] Fig. 9 It is a structural diagram of another part of the sand core coating system of the present invention. DETAILED DESCRIPTION

[0027] The drawings of the present invention are only for illustrative purposes and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0028] Example 1 like Figure 1 As shown, the present embodiment is a design for automatic robot coating of spiral sand cores for low-pressure casting casings, including a workpiece conveying system 100, a robot execution system 200 and a sand core coating system 300. The workpiece conveying system 100 is used to suspend and convey sand core parts, the robot execution system 200 is used to remove the sand cores from the workpiece conveying system and transfer them to the sand core coating system 300, and the sand core coating system 300 is used to coat the sand core parts.

[0029] In this embodiment, if Figure 2As shown, the workpiece conveying system 100 includes a suspension chain rail 110, a rail bracket 120, a hanger 130, an identification and positioning device 140, a drive motor 150, a lubricating device 160, a spring tensioning device 170 and a buzzer (not marked in the figure), the suspension chain rail 110 is supported by multiple rail brackets 120, the hanger 130 is suspended under the suspension chain rail 110, the drive motor 150, the lubricating device 160 and the spring tensioning device 170 are arranged on the suspension chain rail 110, and the buzzer and the identification and positioning device 140 are arranged on the rail bracket 120. By analyzing the irregular shape of the sand core parts, it can be known that it can be placed flat on a transport fixture for transportation to avoid damage to it. At the same time, due to the special shape of the sand core parts and the fragility of the raw materials used to manufacture the sand core parts themselves, they cannot be transported by a belt conveyor. According to the analysis of the properties of the sand core parts, it is known that the mass of the sand core is about 2.232KG, which is a small weight object, so the suspension conveyor chain of the assembly line is used. Since the hanging conveyor chain of the equipment is transported by hanging workpieces, the surface of the sand core parts is reduced from excessive contact with the conveyor belt, which can minimize the damage to the surface of the sand core parts. This equipment achieves seamless connection and efficient transmission of the sand core from the initial position to the coating station by accurately controlling the hanging conveyor chain system driven by the motor; the two lubrication devices 160 on the hanging chain guide 110 lubricate the chain links of the hanging chain guide 110 that are in operation for a long time to prevent excessive friction between the links and the links, which may cause damage to the parts. When the identification and positioning device 140 recognizes that there are no sand core parts in the hanger 130, the buzzer is triggered and the equipment enters the pause state. After the worker puts the sand core on the hanger 130 and restarts the control box 142, the equipment enters the normal operation state.

[0030] In this embodiment, combined with Figure 3 and Figure 4 As shown, the hanger 130 is composed of a connecting rod 131, a boss 132 and a limit device 133. The boss 132 includes a long horizontal plate 1321, two short horizontal plates 1323 and two vertical plates 1322, forming a rectangle with an opening at the bottom. The long horizontal plate 1321 of the rectangle is approximately twice the diameter of the sand core. The length of the vertical plate 1322 is greater than the radius of the sand core and less than the diameter of the sand core. L-shaped steel plates 1324 are provided on the short horizontal plates 1323 on both sides of the opening. There is a gap between the L-shaped steel plate 1324 and the vertical plate 1322, which is used to set up the sand core and reduce the contact area between the sand core and the hanger 130; the limit device 133 is a lower semicircle with a diameter of the rectangular opening length. The diameter of the lower semicircle is slightly larger than the diameter of the sand core, which is used to limit the movement of the sand core to prevent the sand core from being damaged due to friction; the boss 132 and the limit device 133 are used to ensure that the position of the sand core parts is located at a predetermined coordinate.

[0031] In this embodiment, combined with Figure 5As shown, the identification and positioning device 140 is composed of an industrial camera 141 and a control box 142. The industrial camera 141 is located on the crossbar of the guide rail bracket 120, and the control box 142 is set on one of the guide rail brackets 120. According to the layout requirements of the system architecture, the industrial camera 141 is installed on the crossbar of the guide rail bracket 120, which does not affect the transportation of the sand core by the suspension chain guide 110, and the industrial robot 210 takes and transfers the sand core, and can also well shoot whether the parking position of the sand core on the sand core suspension chain guide 110 is correct. The industrial camera 141 has excellent imaging performance and precise positioning capabilities, and can quickly capture the parking moment of the sand core on the suspension chain guide, realize the immediate and accurate judgment of the correctness of the sand core parking position, and improve the automation level and operation efficiency of the production line. In addition, the identification and positioning device 140 is realized based on robot visual recognition technology, which is used to mark and locate the sand core parts during the sand core transmission process to detect the position of the sand core parts, and identify whether there is a sand core on the suspension chain guide and whether the position of the sand core is correct through the visual image function.

[0032] In this embodiment, if Figure 6 As shown, the robot execution system 200 includes an industrial robot 210 and an end effector 220. The industrial robot 210 is located on one side of the suspension chain guide rail 110, and the end effector 220 is located at the end of the mechanical arm of the industrial robot. Through the analysis of the mass and load of the sand core parts, the ABB IRB 2600ID industrial robot is selected to perform the sand core clamping and transfer work. It is known that the weight of the sand core parts is about 2.232 kg, and the load of the ABB IRB 2600ID industrial robot reaches 15 kg, which can meet the handling of the sand core parts. In addition, the IRB 2600ID industrial robot mechanical arm has high rigidity and strength, and occupies a small area, which can save the use space of the working area. The ABB-IRB2600 series original servo motor 3HAC030216-003 is selected as the drive motor to reduce the occurrence of production and processing accidents caused by the robot drive motor in the future, and the unmatched robot drive motor will affect the operation efficiency of the ABB IRB 2600 robot. The equipment not only integrates high-precision robotic arms and intelligent sensors, but also deeply integrates advanced machine vision technology, enabling the industrial robot 210 to accurately identify and firmly clamp each sand core, and perform a series of complex actions including clamping, transferring to the coating area, and accurately coating. This process completely abandons the traditional manual painting method, reduces manual intervention, and reduces labor intensity. It not only significantly improves work efficiency, but also ensures the uniformity and consistency of coating, thereby greatly improving the production quality and stability of sand cores.

[0033] In this embodiment, if Figure 7As shown, the end effector 220 includes a finger cylinder 221 and a flange plate 222, the flange plate 222 is connected to the mechanical arm of the industrial robot 210, and the finger cylinder 221 is connected to the flange plate 222. The working process of the end effector 220 removing the sand core from the hanger 130 is specifically as follows: due to the gap between the L-shaped steel plate 1324 and the vertical plate 1322, the finger cylinder 221 of the end effector 220 passes through the gap to clamp the sand core, slightly moves upward to break away from the limit of the limit device 133, and then moves horizontally to take it out. In order to meet the clamping requirements of spiral sand cores in various situations, the finger cylinder 221 model MHZ2-40D is selected, with an outer diameter clamping force of 254N and an inner diameter clamping force of 318N, ensuring the stability and safety of the clamping process. In order to further improve the stability of clamping, the end effector 220 adopts a dual cylinder layout, that is, two MHZ2-40D finger cylinders of the same model are selected to work in parallel, which not only effectively disperses the clamping force and avoids sand core damage caused by excessive force at a single point, but also achieves a more uniform and reliable clamping effect on the spiral sand core through the synchronous action of the dual cylinders, thereby greatly improving the accuracy and stability of the clamping operation.

[0034] In this embodiment, combined with Figure 8 and Fig. 9As shown, the sand core coating system 300 includes a coating box 310, a sand core placement base 320, a stirring blade 330, a water level sensor 340 and a rotary drive motor 350; the coating box 310 is located on the right side of the industrial robot 210, the sand core placement base 320 is located at one end of the coating box 310, the stirring blade 330 is located at the other end of the coating box 310, and the water level sensor 340 is located in the coating box 310. In order to facilitate the end effector 220 of the industrial robot 210 to transfer the sand core parts to the coating box 310, the coating box 310 is made into a structure with an upper end opening, and the upper end opening structure is convenient for adding graphite coating to the coating box 310. Considering that the graphite coating will partially precipitate when it is static, resulting in the surface of the sand core parts cannot be fully coated or uneven coating, the rotary drive motor 350 is designed to drive the stirring blade 330 to stir the graphite coating in the coating box 310, so that the viscosity of the graphite coating at each location in the coating box 310 remains relatively consistent. Since the industrial robot 210 clamps the sand core parts and puts them into the coating box 310 for coating, it will be difficult for the coating to penetrate the gap between the end effector 220 and the sand core parts to penetrate into the surface of the sand core parts, so a sand core placement base 320 set for the irregular shape of the sand core parts is installed at the bottom of the coating box 310. The sand core parts are placed in it by the end effector 220 of the industrial robot 210, and wait for 2 to 3 seconds. The graphite coating is fully contacted with the surface of the sand core parts by the stirring blade 330 driven by the rotating drive motor 350. Finally, the end effector 220 of the industrial robot 210 takes out the finished product, transfers it to the hanger 130 of the hanging conveyor chain 110, and transfers it to the next processing station; during the coating process of the sand core parts, the water level sensor 340 monitors the liquid level of the coating in the coating box 310 in real time. When the liquid level of the coating is lower than a certain amount during the coating process, it will be fed back to the system, and the system will send a command to the buzzer, and the buzzer will alarm to remind the worker to add graphite coating.

[0035] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A design for automatic coating of spiral sand core coating by a robot for low-pressure casting casing, comprising a workpiece conveying system, a robot execution system and a sand core coating coating system, wherein the workpiece conveying system is used for hanging and conveying sand core parts, the robot execution system is used for removing sand cores from the workpiece conveying system and transferring them to the sand core coating coating system, and the sand core coating coating system is used for coating sand core parts; It is characterized in that The workpiece conveying system comprises a suspension chain guide rail, a guide rail bracket, and an identification and positioning device. The suspension chain guide rail is supported by a plurality of guide rail brackets, and the identification and positioning device is arranged on the guide rail bracket.

2. The design of automatic coating robot for spiral sand core coating of low-pressure casting casing according to claim 1 is characterized in that: The identification and positioning device is composed of an industrial camera and a control box. The industrial camera is located on the crossbar of the guide rail bracket, and the control box is arranged on one of the guide rail brackets.

3. The design of automatic coating of spiral sand core coating robot for low-pressure casting casing according to claim 2 is characterized in that: The workpiece conveying system also includes a hanger, a drive motor, a lubrication device, a spring tensioning device and a buzzer. The hanger is suspended under the suspension chain guide rail, the drive motor, the lubrication device and the spring tensioning device are arranged on the suspension chain guide rail, and the buzzer is arranged on the guide rail bracket.

4. The design of automatic coating robot for spiral sand core coating of low-pressure casting casing according to claim 3 is characterized in that: The hanger comprises a connecting rod, a boss and a limiting device, wherein the connecting rod is connected to the suspension rail, the boss is connected to the connecting rod, and the limiting device is connected below the boss.

5. The design of automatic coating robot for spiral sand core coating of low-pressure casting casing according to claim 4 is characterized in that: The robot execution system comprises an industrial robot and an end effector, wherein the industrial robot is located at one side of the suspension chain guide rail, and the end effector is located at the end of the mechanical arm of the industrial robot.

6. The design of automatic coating robot for spiral sand core coating of low-pressure casting casing according to claim 5 is characterized in that: The end effector comprises a finger cylinder and a flange plate, wherein the flange plate is connected to the mechanical arm of the industrial robot, and the finger cylinder is connected to the flange plate.

7. The automatic coating design of spiral sand core coating robot for low-pressure casting casing according to any one of claims 1 to 6, characterized in that: The sand core coating system includes a coating box, a sand core placement base and a stirring blade. The coating box is located on the right side of the industrial robot, the sand core placement base is located at one end of the coating box, and the stirring blade is located at the other end of the coating box.

8. The design of automatic coating robot for spiral sand core coating of low-pressure casting casing according to claim 7 is characterized in that: The paint coating system further comprises a water level sensor, and the water level sensor is used to detect the liquid level of the paint in the paint coating box.

9. The design of automatic coating robot for spiral sand core coating of low-pressure casting casing according to claim 8 is characterized in that: The paint coating system further comprises a buzzer, which is used to alarm when the water level sensor detects that the liquid level in the paint coating box is lower than a preset value.

10. The design of automatic coating robot for spiral sand core coating of low-pressure casting casing according to claim 9 is characterized in that: The paint coating system further comprises a rotary drive motor, and the rotary drive motor is located in the bottom of the paint coating box.

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