Salt mist simulation experiment equipment for coating detection

Abstract

The invention relates to the technical field of coating detection, in particular to salt mist simulation experiment equipment for coating detection. The salt mist simulation experiment equipment for paint detection comprises a barrel body and a top cover, the barrel body and the top cover are combined to form a corrosion space, and the corrosion space is used for containing corrosion liquid; a heating assembly used for heating is arranged in the barrel body. The mist generator is used for atomizing the corrosive liquid in the barrel body, a cavity ring is arranged on the barrel body, a nozzle is arranged on the inner wall of the barrel body, the nozzle is communicated with the cavity ring, and the mist generator is communicated with the inner bottom of the barrel body and the cavity ring. And the clamping frame is provided with a plurality of clamping units for fixing the coating sample wafer. And the rotation driving piece is in transmission connection with the clamping frame and used for driving the clamping frame to rotate. Under the action of stirring, centrifugal force and air flow in the barrel body, non-uniform corrosion caused by accumulation of liquid drops on the coating sample sheet is avoided, and the uniformity of a corrosion experiment and the objectivity of detection are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coating detection, and particularly relates to a salt spray simulation test device for coating detection. Background Technique

[0002] A coating is a material that can form a tough protective film or decorative film after being coated on the surface of an object, and is widely used for protecting, beautifying or endowing the object with special functions. The following is a detailed introduction to coatings: 1. Composition of coatings. Coatings usually consist of the following components: Film-forming substances (resins / binders): such as acrylic resins, epoxy resins, etc., which determine the adhesion, hardness and other properties of the coatings. Pigments: Provide color and hiding power (such as titanium dioxide), and some pigments have functions such as rust prevention (such as zinc phosphate) and weather resistance. Solvents: Adjust the viscosity of the coatings to facilitate construction (such as water, organic solvents), and form a coating film after volatilization. Auxiliaries: Improve performance, such as leveling agents (to make the surface smooth), defoamers (to prevent foaming), ultraviolet absorbers (anti-aging), etc. 2. Main functions of coatings. Protection: Prevent corrosion (such as metal anti-rust paint), wear, ultraviolet erosion, etc. Decoration: Provide color and gloss (such as interior wall latex paint, automotive metallic paint). Special functions: Fireproof (fire-retardant coatings), mildew-proof (bathroom coatings), heat-insulating (building reflective coatings), conductive (electronic component coatings), etc. 3. Classification of coatings. By use: Architectural coatings: Interior wall paints, exterior wall coatings, floor paints. Industrial coatings: Automotive paints, ship anti-corrosion coatings, mechanical equipment coatings. Special coatings: Fireproof coatings, conductive coatings, stealth coatings. By form: Solvent-based coatings: Traditional paints, containing organic solvents (such as nitro paints). Waterborne coatings: Using water as a solvent (such as latex paint), environmentally friendly with low VOC. Powder coatings: Solvent-free, cured at high temperature after electrostatic spraying (used for household appliances, metal parts). By function: Anti-corrosion coatings, heat-insulating coatings, antibacterial coatings, etc. 4. Application fields. Construction industry: Interior and exterior wall, roof waterproof coatings. Industrial manufacturing: Surface coating of automobiles, airplanes, electronic products. Home decoration: Wood coatings, artistic coatings. Transportation: Ship and bridge anti-corrosion, road marking coatings. Special scenarios: High-temperature resistant coatings for spacecraft, antibacterial coatings for hospitals. 5. Environmental protection trend. With the improvement of environmental protection requirements, waterborne coatings and powder coatings are gradually replacing traditional solvent-based coatings due to their low pollution and low VOC emissions. In addition, the research and development directions also include innovative products such as self-healing coatings and photocatalytic air-purifying coatings.

[0003] Salt spray refers to a dispersion system composed of tiny salt-containing droplets in the atmosphere. Salt spray test is an environmental test that mainly uses the artificial simulated salt spray environment conditions created by salt spray test equipment to assess the corrosion resistance of products or metal materials. The salt spray test standard makes clear and specific regulations on salt spray test conditions, such as temperature, humidity, sodium chloride solution concentration and pH value, etc. In addition, technical requirements are also put forward for the performance of the salt spray test chamber. The products that need to undergo salt spray tests are mainly some metal products, and the corrosion resistance of the products is inspected through detection.

[0004] In traditional salt spray test equipment, liquid droplets are likely to accumulate on the surface of the paint sample sheet. The long-term accumulation of liquid droplets results in differences between the components inside the liquid droplets and the salt spray components, causing uneven corrosion and inaccurate detection. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a salt spray simulation test equipment for paint detection, which is used to conduct salt spray simulation tests on paint surface samples. The salt spray simulation test equipment for paint detection includes:

[0006] A barrel body and a top cover. The barrel body and the top cover are combined to form a corrosion space, and the corrosion space is used to hold a corrosion liquid; a heating component for heating at a specified temperature is arranged inside the barrel body; the top cover can be covered and fixed manually.

[0007] A mist generator, which is used to atomize the corrosion liquid inside the barrel body. An air cavity ring is arranged on the barrel body, and nozzles are arranged on the inner wall of the barrel body. The nozzles are communicated with the air cavity ring, and the mist generator is communicated with the bottom inside the barrel body and the air cavity ring;

[0008] A clamping rack, on which a plurality of clamping units for fixing the paint sample sheet are arranged; the clamping rack can be directly rotatably arranged inside the barrel body.

[0009] A rotation driving member, which is in transmission connection with the clamping rack and is used to drive the clamping rack to rotate;

[0010] A controller, which is electrically connected to the mist generator, the rotation driving member, and the heating component.

[0011] Preferably: a liquid inlet pipe is communicated with the barrel body, and the liquid inlet pipe is communicated with a liquid pump and a liquid source; a component detection device for detecting the content of each component in the corrosion liquid.

[0012] Preferably: a support frame for restricting the rotation of the top cover is fixedly installed on the barrel body. A lead screw is rotatably arranged on the support frame. The lead screw is located above the barrel body, and the bottom end of the lead screw extends into the upper inner part of the barrel body; the rotation driving member is in transmission connection with the lead screw; the top cover is of a disc structure, and a through hole is opened in the middle of the top cover. Two first balls are rotatably arranged on the side wall of the through hole. The two first balls are arranged oppositely, and the first balls are matched with a spiral groove. A connecting sleeve is coaxially and rotatably arranged at the bottom of the top cover. A through hole is also opened in the middle of the connecting sleeve. Two second balls are rotatably arranged on the inner wall of the through hole of the connecting sleeve. The two second balls are arranged oppositely, and the second balls are matched with the spiral groove; a lower circular groove is opened in the lower part of the lead screw. The plane where the lower circular groove is located is the same as the plane where the top cover is located. The lower circular groove is located above the bottom of the spiral groove, and the distance between the lower circular groove and the bottom of the spiral groove is the same as the distance between the first ball and the second ball; a top circular groove is opened at the top of the lead screw, and the top circular groove is communicated with the top of the spiral groove; the clamping racks are arranged in a circular array on the connecting sleeve.

[0013] Preferably, the clamping unit includes a connecting rod, an upper clamping rod and a lower clamping rod. The lower clamping rod is fixedly connected to the connecting rod. The upper clamping rod elastically slides on the connecting rod through an elastic sliding component and is located above the lower clamping rod.

[0014] Preferably, a backing plate is fixedly connected to the connecting rod.

[0015] Preferably, the elastic sliding component includes a sliding groove, a sliding block and a spring. The sliding groove is formed in the connecting rod. The sliding block slides inside the sliding groove. The sliding direction of the sliding block is the same as the clamping direction. A spring is arranged inside the sliding groove, and the spring makes the sliding block slide towards the lower clamping rod. The upper clamping rod is fixedly connected to the sliding block.

[0016] Preferably, a connecting side plate is fixedly arranged on the upper clamping rod. A connecting hole is formed in the side wall of the connecting side plate. A screw passes through the connecting hole and is fixed to the sliding block. The connecting side plate covers the outer surface of the sliding groove.

[0017] Preferably, the connecting hole includes a cylindrical portion and a multi-faceted portion. An inlaid block is arranged on the sliding block. The inlaid block includes a circular and multi-faceted protrusion. The circular and multi-faceted protrusion of the inlaid block is fitted and nested with the cylindrical portion and the multi-faceted portion of the connecting hole.

[0018] Preferably, a base frame can be installed at the bottom of the barrel body. The base frame can support the barrel body, thereby ensuring the stability of the placement of the barrel body and a specific working height.

[0019] Preferably, the base frame can include a circular placement ring and support legs. The circular placement ring can be a circular ring structure with an L-shaped cross-section. Its inner radius is the same as or slightly larger than the outer diameter of the bottom of the barrel body, so that the barrel body can be placed in the circular placement ring and can be fixed by screws. The support legs are fixedly connected to the bottom of the circular placement ring. The number of support legs can be set to three and bend outwards, thereby increasing the stability of the placement.

[0020] Preferably, the rotation driving member can include a motor and a pulley. The motor is installed on the support frame. A pulley is coaxially fixedly connected to the output shaft of the motor. A pulley is also coaxially fixedly connected to the lead screw. The two pulleys are connected by a belt. The power of the motor is transmitted through the belt, so that the lead screw rotates. The motor can be a three-phase motor and can drive the lead screw to rotate forward and backward at a constant speed.

[0021] Preferably, the control method of the controller includes: the controller controls the rotation driving member to drive the lead screw to rotate reversely, so that the top cover and the clamping frame are lifted to the top of the lead screw; the lead screw continues to rotate reversely, so that the clamping frame and the clamping unit rotate, and the coating sample is placed on the clamping unit. The controller controls the liquid inlet pipe to make the corrosive liquid components inside the barrel meet the detection requirements. The controller controls the heating component to heat the inside of the barrel to the target temperature. After the sample is placed, the controller controls the rotation driving member to drive the lead screw to rotate forward. When the top cover and the connecting sleeve reach the lowest point, the top cover covers the top of the barrel to complete the sealing of the barrel, thereby forming a sealed corrosion space. The controller controls the fog generator to atomize, and the rotation driving member drives the lead screw to rotate, and the lead screw drives the clamping frame to rotate for corrosion.

[0022] Preferably, the liquid inlet method of the liquid inlet pipe includes: detecting and obtaining the current concentration C i of each component in the corrosive liquid, where i is the number of the corrosive liquid component. Obtain the experimental type, and then obtain the target component concentration C i ' through the experimental type, and then judge whether the current component concentration C i reaches the target component concentration C i '. If so, no liquid is fed into the component with this number. If not, control the liquid inlet pipe corresponding to the component with this number to feed liquid, and then perform cyclic detection and judgment.

[0023] Preferably, the liquid inlet volume where V0 is the volume of the corrosive liquid inside the current barrel, ɑ is the dissociation degree at the current concentration of the corrosive liquid component numbered i, which can be obtained by looking up the table according to the component attributes, C i T is the standard concentration of the corrosive liquid component numbered i, that is, the concentration when the liquid inlet pipe is connected to the liquid source, and this concentration needs to be greater than or equal to the target component concentration. Through this liquid inlet method combined with the calculation of the liquid inlet volume, it is possible to quickly feed each component concentration and judge in real time, form a progressive stepped liquid inlet, and as the liquid inlet volume increases, the liquid inlet volume changes in a gradient manner, with precise component control, avoiding the slow ratio adjustment caused by too small dissociation degree, and improving the accuracy and intelligent ability of liquid preparation.

[0024] Preferably, the atomization flow rate of the fog generator where M is the sedimentation amount of the salt spray experiment, r is the inner wall radius of the barrel, which can be obtained according to the equipment parameters. β is the unit evaporation amount of the corrosive liquid at the target temperature. By calculating and controlling the atomization flow rate through this method, the control is precise, and considering the influence of equipment parameters and evaporation amount, intelligent control is achieved, and the experiment is convenient and precise.

[0025] Technical effects and advantages of the present invention: The mist inside the stirring barrel of the paint sample is stirred, making its distribution uniform. The salt spray can flow on the surface of the paint sample, making the liquid film components on the paint sample uniform, and avoiding the corrosion hindrance caused by the accumulation of liquid droplets on the paint sample. The structure of this experimental equipment is simple. By stirring the paint sample inside the barrel, under the action of centrifugal force and air flow, the accumulation of liquid droplets on the paint sample is avoided, and the uneven corrosion is prevented, improving the uniformity of the corrosion experiment and the objectivity of detection, which is convenient for accurate detection in the later stage. Brief Description of the Drawings

[0026] Figure 1 FIG. is a schematic perspective view of a salt spray simulation experimental device for paint detection proposed by the present invention.

[0027] Figure 2 FIG. is a schematic top view of a salt spray simulation experimental device for paint detection proposed by the present invention.

[0028] Figure 3 Proposed by the present invention Figure 2 Partial sectional view of the A-A section in FIG.

[0029] Figure 4 FIG. is a schematic structural view of a clamping unit in a salt spray simulation experimental device for paint detection proposed by the present invention.

[0030] Figure 5 Proposed by the present invention Figure 4 Partial enlarged structural view of a in FIG.

[0031] Figure 6 FIG. is a schematic sectional view of a connecting sleeve in a salt spray simulation experimental device for paint detection proposed by the present invention.

[0032] Figure 7 FIG. is a schematic structural view of the upper part of a lead screw in a salt spray simulation experimental device for paint detection proposed by the present invention.

[0033] Explanation of reference numerals: barrel body 1, liquid inlet pipe 2, base frame 3, drain pipe 4, mist generator 5, cavity ring 6, controller 7, rotation driving member 8, top cover 9, clamping frame 10, lead screw 11, nozzle 12, connecting rod 13, lower clamping rod 14, backing plate 15, connecting side plate 16, upper clamping rod 17, connecting hole 18, sliding groove 19, sliding block 20, optical axis 21, embedded block 22, spring 23, spiral groove 24, first ball 25, connecting sleeve 26, second ball 27, lower circular groove 28, upper circular groove 29. Detailed Description of the Invention

[0034] Embodiments of the present disclosure will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present disclosure and should not be construed as limiting the present disclosure. On the contrary, the embodiments of the present disclosure include all variations, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0035] Embodiment 1

[0036] Reference Figures 1-3 , in this embodiment, a salt spray simulation experimental device for coating detection is proposed, which is used to conduct a salt spray simulation experiment on a paint surface sample. The salt spray simulation experimental device for coating detection may include:

[0037] Barrel body 1, an erosion space is formed inside the barrel body 1. The barrel body 1 can be a cylindrical structure, on which a top cover 9 can be provided. The bottom of the barrel body 1 can be a conical structure with a lower middle and higher periphery. A drain pipe 4 can be connected to the bottom of the barrel body 1, and a control valve is provided on the drain pipe 4. By opening the valve, the corrosive liquid inside the barrel body 1 can be discharged from the barrel body 1. The corrosive liquid has certain corrosiveness. The barrel body 1 can be made of stainless steel and is provided with an anti-corrosion layer inside to avoid equipment damage. Of course, the barrel body 1 can also be made of glass material, etc., which will not be elaborated here specifically. A base frame 3 can be installed at the bottom of the barrel body 1. The base frame 3 can support the barrel body 1 to ensure the stability of the placement of the barrel body 1 and a specific working height. The base frame 3 can include a circular placement ring and support legs. The circular placement ring can be a circular ring structure with an L-shaped cross-section, and its inner radius is the same as or slightly larger than the outer diameter of the bottom of the barrel body 1, so that the barrel body 1 can be placed in the circular placement ring and then fixed by screws. The support legs are fixedly connected to the bottom of the circular placement ring. The number of support legs can be set to three and bend outwards to increase the stability of the placement. A liquid inlet pipe 2 can also be connected to the barrel body 1. The liquid inlet pipe 2 is connected with a control valve. The number of liquid inlet pipes 2 can be set to multiple, generally 1, 2 or 3. The liquid inlet pipe 2 can be connected to a liquid pump and a liquid source. The specific number of liquid inlet pipes 2 can be determined according to the type of experiment. If the type of experimental equipment is neutral salt spray (NSS), the corrosive solution is NaCl solution, and the number of liquid inlet pipes 2 can be set to 1. The liquid inlet pipe 2 can be connected to a liquid tank filled with NaCl solution, and the liquid can be quantitatively pumped into the barrel body 1 through a liquid pump, which will not be elaborated here specifically. If the type of experimental equipment is acetic acid salt spray (AASS), the corrosive solution is 5% NaCl + acetic acid, and the number of liquid inlet pipes 2 can be set to 2. The liquid inlet pipes 2 can be respectively connected to liquid tanks filled with sodium chloride solution and acetic acid, and the liquid can be quantitatively pumped into the barrel body 1 according to the ratio through a liquid pump, which will not be elaborated here specifically. If the type of experimental equipment is copper-accelerated salt spray (CASS) type experiment, the number of liquid inlet pipes 2 can be set to 3. The liquid inlet pipes 2 can be respectively connected to liquid tanks filled with sodium chloride solution, acetic acid and copper chloride, and the liquid can be quantitatively pumped into the barrel body 1 according to the ratio through a liquid pump, which will not be elaborated here specifically. The specific number of liquid inlet pipes 2 can be set according to actual needs, which will not be elaborated here specifically. The type of experimental equipment can also be cyclic corrosion (CCT), which will not be elaborated here specifically.

[0038] The mist generator 5 is installed on the base frame 3 or the barrel body 1. The mist generator 5 is used to atomize the corrosive liquid inside the barrel body 1, and its atomization method can be compressed air atomization or ultrasonic atomization. Therefore, the mist generator 5 can be a compressed liquid pump or an ultrasonic atomizer. A cavity ring 6 is provided on the barrel body 1, and a nozzle 12 is provided on the inner wall of the barrel body 1. The number of nozzles 12 can be set to multiple. The nozzle 12 is communicated with the cavity ring 6. The mist generator 5 is communicated with the inner bottom of the barrel body 1 and the cavity ring 6. Under the action of the mist generator 5, the corrosive liquid inside the barrel body 1 is atomized into gas and ejected from the nozzle 12 for corrosion. The size of the atomized particles of the nozzle 12 needs to meet the required standard, which will not be elaborated here. The nozzle 12 can be located at the upper part of the inner wall of the barrel body 1. Of course, it can also be adjusted according to specific circumstances, which will not be elaborated here. A support frame can be fixedly installed on the barrel body 1 or the base frame 3. A lead screw 11 is rotatably provided on the support frame. The lead screw 11 can be located above the barrel body 1 and at the axial center position of the barrel body 1, and the bottom end of the lead screw 11 extends into the upper interior of the barrel body 1. A rotation driving member 8 is in transmission connection with the lead screw 11. The rotation driving member 8 is used to drive the lead screw 11 to rotate. The rotation driving member 8 can include a motor and a pulley. The motor is installed on the support frame. The output shaft of the motor is coaxially and fixedly connected with a pulley. The lead screw 11 is also coaxially and fixedly connected with a pulley. The two pulleys are connected by a belt. The power of the motor is transmitted through the belt, so that the lead screw 11 rotates. The motor can be a three-phase motor and can drive the lead screw 11 to rotate forward and backward at a uniform speed. Two spiral grooves 24 can be formed on the lead screw 11. The two spiral grooves 24 can be evenly distributed, which will not be elaborated here.

[0039] Reference Figures 6-7, the top cover 9 is a disc structure. A through hole is provided in the middle of the top cover 9. Two first balls 25 are rotatably arranged on the side wall of the through hole. The two first balls 25 can be arranged oppositely. The first balls 25 cooperate with the spiral groove 24. A connecting sleeve 26 is rotatably arranged coaxially at the bottom of the top cover 9. A through hole is also provided in the middle of the connecting sleeve 26. Two second balls 27 are rotatably arranged on the inner wall of the through hole of the connecting sleeve 26. The two second balls 27 can be arranged oppositely. The second balls 27 cooperate with the spiral groove 24. The first balls 25 and the second balls 27 are nested and fitted inside the spiral groove 24. When the lead screw 11 rotates, a convex block can be provided on the side wall of the top cover 9. The convex block can cooperate with the support frame. The support frame blocks the convex block, thereby restricting the rotation of the top cover 9. When the lead screw 11 rotates, since the top cover 9 is restricted from rotating, the top cover 9 can be driven to move up and down. A lower ring groove 28 can be provided at the lower part of the lead screw 11. The plane where the lower ring groove 28 is located is the same as the plane where the top cover 9 is located, and both can be horizontally arranged. The lower ring groove 28 is above the bottom of the spiral groove 24. The distance between the lower ring groove 28 and the bottom of the spiral groove 24 is the same as the distance between the first balls 25 and the second balls 27. The two first balls 25 are on the same horizontal plane. When the lead screw 11 rotates forward, the top cover 9 is restricted from rotating and cannot rotate, thereby driving the top cover 9 to move downward from top to bottom. The first balls 25 and the second balls 27 roll in the spiral groove 24. When the top cover 9 and the connecting sleeve 26 reach the lowest point, at this time, the second balls 27 are at the bottom position of the spiral groove 24, and the first balls 25 are at the position of the lower ring groove 28. When the lead screw 11 rotates, it cannot drive the top cover 9 and the connecting sleeve 26 to continue to descend. At this time, the top cover 9 is at the top of the barrel 1. The barrel 1 restricts the top cover 9 from descending. When the lead screw 11 continues to rotate, the end of the spiral groove 24 restricts the second balls 27 from rolling therein, and the first balls 25 rotate in the lower ring groove 28. The top cover 9 covers the top of the barrel 1 to complete the sealing of the barrel 1, thereby forming a sealed corrosion space. When the lead screw 11 continues to rotate, it can drive the connecting sleeve 26 to rotate on the top cover 9. A top ring groove 29 is provided at the top of the lead screw 11. The top ring groove 29 can be horizontally arranged. The top ring groove 29 communicates with the top of the spiral groove 24. When the barrel 1 needs to be opened, the driving member 8 is rotated to drive the lead screw 11 to rotate reversely. The second balls 27 roll in the spiral groove 24. Due to the driving inclined surface of the spiral groove 24, the connecting sleeve 26 receives an upward reaction force, so that the first balls 25 enter the inside of the spiral groove 24, thereby driving the top cover 9 and the connecting sleeve 26 to lift upward. When the top cover 9 and the connecting sleeve 26 move to the top, at this time, the first balls 25 are inside the top ring groove 29. Since the spiral groove 24 has reached the end, when the lead screw 11 continues to rotate, it can continue to drive the connecting sleeve 26 to rotate. At this time, the first balls 25 roll inside the top ring groove 29.In order to facilitate the better lifting of the top cover 9, so that the first ball 25 disengages from the lower annular groove 28 and enters the spiral groove 24 to complete the state conversion, a sealing buffer ring can be provided at the bottom edge of the top cover 9, and the sealing buffer ring is adapted to the top of the barrel 1. The buffer ring has a certain elasticity and sealing property, and can quickly rebound and convert the state under the action of the elastic force of the sealing buffer ring, and at the same time, the assembly sealing property of the barrel 1 can be increased. The sealing buffer ring can be made of rubber or resin material, and will not be elaborated here. A clamping frame 10 is provided on the connecting sleeve 26, and a number of clamping units are installed on the clamping frame 10. The clamping units are used to clamp and fix the coating sample piece, so as to complete the placement of the coating sample piece. Generally, the coating sample piece generally needs to be cut into a rectangle. The clamping units can be arranged in a circular array on the connecting sleeve 26, so as to complete the installation and fixation of the clamping units. The clamping units can be made of glass or glass fiber material, so as to avoid corrosion. In order to increase the number of placements, a plurality of clamping frames 10 can be fixedly arranged in a circular array on the connecting sleeve 26. The clamping frames 10 are distributed obliquely downward or vertically downward. If inclined, the inclination angle is between 15-30 degrees. Of course, other numerical settings are not excluded. The clamping units are arranged in a linear array on the clamping frame 10, and will not be elaborated here. Reference. Figures 4-5, the clamping unit may include a connecting rod 13, an upper clamping rod 17 and a lower clamping rod 14. The connecting rod 13 may be inclined or be a part of the clamping frame 10. The lower clamping rod 14 may be fixedly connected to the connecting rod 13. The upper clamping rod 17 elastically slides on the connecting rod 13 through an elastic sliding component. The upper clamping rod 17 is located above the lower clamping rod 14. When the upper clamping rod 17 slides away from the lower clamping rod 14, a paint sample is placed between the upper clamping rod 17 and the lower clamping rod 14, and the upper clamping rod 17 elastically approaches the lower clamping rod 14, so that the paint sample can be clamped and fixed. A backing plate 15 may be fixedly connected to the connecting rod 13, and the backing plate 15 can increase the stability of the placement of the paint sample. When the clamping unit rotates with the clamping frame 10, the upper clamping rod 17 will rotate with the connecting sleeve 26, so that the upper clamping rod 17 will be subjected to a centrifugal force and approach the lower clamping rod 14, making the clamping more stable and preventing the paint sample from falling off due to the rotation speed. The elastic sliding component may include a sliding groove 19, a sliding block 20 and a spring 23. The sliding groove 19 is opened on the connecting rod 13, and it is preferably opened on the side wall of the connecting rod 13 in a penetrating form. The sliding block 20 slides inside the sliding groove 19, and the sliding direction of the sliding block 20 is the same as the clamping direction. A spring 23 is arranged inside the sliding groove 19, and the spring 23 makes the sliding block 20 slide towards the lower clamping rod 14. The upper clamping rod 17 may be fixedly connected to the sliding block 20. A light shaft 21 is fixedly arranged inside the sliding groove 19, the sliding block 20 can slide and sleeve on the light shaft 21, and the spring 23 is sleeved on the light shaft 21, so that the sliding of the sliding block 20 is stable. A connecting side plate 16 may be fixedly arranged on the upper clamping rod 17. A connecting hole 18 is opened on the side wall of the connecting side plate 16, and a screw can be fixed to the sliding block 20 through the connecting hole 18, thus completing the installation of the upper clamping rod 17. The connecting side plate 16 can cover the outer surface of the sliding groove 19, so as to protect the components inside the sliding groove 19 and prevent corrosion. The connecting hole 18 may include a cylindrical part and a multi-faceted part. An inlaid block 22 is arranged on the sliding block 20. The inlaid block 22 includes circular and multi-faceted protrusions. The circular and multi-faceted protrusions of the inlaid block 22 can be nested with the cylindrical part and the multi-faceted part of the connecting hole 18, so that the installation of the upper clamping rod 17 is stable and rotation is avoided, thus ensuring stable installation.

[0040] A heating component may also be arranged inside the barrel body 1. Through the heating component, the inside of the barrel body 1 can be heated to a specified temperature. The heating component is a specific prior art and will not be elaborated here.

[0041] A component detection device may also be arranged inside the barrel body 1. The component detection device can detect the content of each component in the corrosive liquid. The component detection device is a prior art and will not be elaborated here specifically.

[0042] The controller 7 can be installed on the barrel body 1, on the support frame or remotely controlled. The controller 7 can be electrically connected to the fog generator 5, the rotation driving member 8, the heating assembly and the component detection device. The controller 7 is used to control the spray flow rate of the fog generator 5 and the driving speed and steering of the rotation driving member 8. The controller 7 controls the rotation driving member 8 to drive the lead screw 11 to rotate reversely, so that the top cover 9 and the clamping frame 10 are lifted to the top of the lead screw 11. At this time, the first ball 25 is at the position of the top ring groove 29. The lead screw 11 continues to rotate reversely, so that the clamping frame 10 and the clamping unit rotate, and the coating sample can be placed on the clamping unit, avoiding the operator's rotation operation, enabling fixed-point operation, and making the operation convenient and fast. The controller 7 controls the liquid inlet pipe 2 to make the corrosion liquid components inside the barrel body 1 meet the detection requirements. Specifically, the current concentration C of each component in the corrosion liquid can be detected i , where i is the number of the corrosion liquid component, and its numbering order can be numbered in the order of NaCl, acetic acid coating, and copper chloride. Then the experiment type is obtained. The experiment type can be selected or set through the controller 7, and then the target component concentration C i ’ is obtained. The target component concentration C i ’ can be preset in advance, and the specific details are not elaborated here. Then it is judged whether the current component concentration C i reaches the target component concentration C i ’. Here, reaching needs to be determined according to the actual situation. For example, whether the current concentration of the NaCl solution is equal to or greater than or equal to the target component concentration C i ’ of 5%. Acetic acid can be judged according to the pH value, and the judgment standard is whether it is equal to or less than 3.3. Other situations are not elaborated here. If so, no liquid is fed for the component with this number. If not, the liquid inlet pipe 2 corresponding to the component with this number is controlled to feed liquid, and the liquid feed amount Among them, V0 is the volume of the corrosion liquid inside the current barrel body 1. If the original corrosion liquid inside the barrel body 1 is 0, a 5% sodium chloride solution with a basic liquid volume can be injected into the barrel body 1. The specific value can be determined according to the equipment parameters of the barrel body 1 and needs to meet the minimum detection requirements. The specific details are not elaborated here. ɑ is the dissociation degree at the current concentration of the corrosion liquid component numbered i, which can be obtained by looking up the table according to the component properties, C i Tis the standard concentration of the corrosion liquid component numbered i, that is, the concentration of the liquid source connected by the liquid inlet pipe 2, and this concentration needs to be greater than or equal to the target component concentration. Then, cyclic detection and judgment are carried out. Through this liquid inlet method combined with the calculation of the liquid inlet volume, the concentrations of each component can be quickly fed and judged in real time, forming a progressive stepped liquid inlet. Moreover, as the liquid inlet volume increases, the liquid inlet volume changes in a gradient manner, and the component control is precise, avoiding the slow ratio adjustment caused by too small dissociation degree, and improving the accuracy and intelligent ability of liquid preparation. The controller 7 controls the heating component to heat the inside of the barrel 1 to the target temperature, and the target temperature can be obtained according to the experimental type. For example, the target temperature of neutral salt spray (NSS) and acetic acid salt spray (AASS) is 35 °C, and the target temperature of copper accelerated salt spray (CASS) is 50 °C. Of course, the staged target temperature can also be set according to needs, which will not be elaborated here. After the sample is placed, the controller 7 controls the rotation driving member 8 to drive the lead screw 11 to rotate forward. When the top cover 9 and the connecting sleeve 26 drop to the lowest point, at this time, the second ball 27 is at the bottom position of the spiral groove 24, and the first ball 25 is at the lower circular groove 28 position. When the lead screw 11 rotates, it cannot drive the top cover 9 and the connecting sleeve 26 to continue to descend. At this time, the top cover 9 is at the top of the barrel 1, and the barrel 1 restricts the top cover 9 from descending. When the lead screw 11 continues to rotate, the end of the spiral groove 24 restricts the second ball 27 from rolling inside it, and the first ball 25 rotates in the lower circular groove 28. The top cover 9 covers the top of the barrel 1 to complete the sealing of the barrel 1, thus forming a sealed corrosion space. The controller 7 controls the mist generator 5 to atomize, and the atomization flow rate of the mist generator 5 is in the unit of ml / h. Where M is the sedimentation amount of the salt spray experiment, which can be input by the controller 7, and the value is generally 1 - 2 mL / (h·80 cm 2 ), and its value setting needs to meet the experimental standard, which will not be elaborated here. r is the inner wall radius of the barrel 1, which can be obtained according to the equipment parameters, and its unit is cm, which will not be elaborated here. β is the unit evaporation amount of the corrosion liquid at the target temperature, and its unit is ml / (h·cm 2) It can be obtained through the evaporation reduction experiment at this temperature, and the specific details are not elaborated here. By this method, the flow rate of atomization is calculated and controlled precisely. Considering the influence of equipment parameters and evaporation amount, intelligent control is achieved, and the experiment is convenient and accurate. The rotation driving member 8 drives the lead screw 11 to rotate, and the lead screw 11 drives the clamping bracket 10 to rotate. Its rotation speed can be set according to experience, and the specific details are not elaborated here. The fog in the stirring barrel body 1 of the paint sample is agitated to make it evenly distributed. The salt spray can flow on the surface of the paint sample, which can make the liquid film components on the paint sample uniform and avoid the corrosion hindrance caused by the accumulation of liquid droplets on the paint sample. After the experiment is completed, when the barrel body 1 needs to be opened, the controller 7 controls the rotation driving member 8 to drive the lead screw 11 to rotate in the reverse direction. The second ball 27 rolls in the spiral groove 24. Since the spiral groove 24 drives the inclined surface, the connecting sleeve 26 receives an upward reaction force, so that the top cover 9 and the connecting sleeve 26 move upward, so that the first ball 25 enters the inside of the spiral groove 24 to drive the top cover 9 and the connecting sleeve 26 to lift upward. When the top cover 9 and the connecting sleeve 26 move to the top, at this time, the first ball 25 is inside the top ring groove 29. Because the spiral groove 24 has reached the end, the lead screw 11 continues to rotate to specifically drive the clamping bracket 10 to rotate. At this time, the first ball 25 rolls inside the top ring groove 29. The paint sample on the clamping bracket 10 can be taken off for detection. The structure of this experimental equipment is simple. By agitating the paint sample inside the barrel body 1, under the action of centrifugal force and air flow, the accumulation of liquid droplets on the paint sample is avoided, and the uneven corrosion caused thereby is avoided, improving the uniformity of the corrosion experiment and the objectivity of detection, and facilitating accurate detection in the later stage.

[0043] Example 2

[0044] A funnel can be arranged inside the barrel body 1. The funnel is connected to a measuring cylinder, and the connection is on the outer wall of the barrel body 1. The area of the funnel can be 80 square centimeters. Of course, other numerical settings are not excluded. Through the setting of the funnel and the measuring cylinder, the sedimentation amount can be verified to avoid experimental errors caused by inaccurate control.

[0045] It should be understood that various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps recorded in this disclosure can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution disclosed in this disclosure can be achieved. No limitations are imposed herein.

[0046] The above specific implementation manners do not constitute a limitation to the protection scope of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub - combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A salt spray simulation experimental device for coating detection, characterized in that, The salt spray simulation experimental equipment for coating detection includes: A barrel body and a top cover. The barrel body and the top cover form a corrosion space, and the corrosion liquid is placed in the corrosion space. A heating component for heating at a specified temperature is arranged in the barrel body; A mist generator, which is used to atomize the corrosion liquid inside the barrel body. A cavity ring is arranged on the barrel body, and nozzles are arranged on the inner wall of the barrel body. The nozzles are communicated with the cavity ring. The mist generator is communicated with the bottom inside the barrel body and the cavity ring; A clamping rack, on which a plurality of clamping units for fixing coating specimens are arranged; A rotation driving member, which is in transmission connection with the clamping rack and is used to drive the clamping rack to rotate; A controller, which is electrically connected to the mist generator, the rotation driving member, and the heating component.

2. The salt spray simulation test equipment for coating detection according to claim 1, characterized in that, A liquid inlet pipe is communicated with the barrel body. The liquid inlet pipe is communicated with a liquid pump and a liquid source. A component detection device for detecting the content of each component in the corrosion liquid; 3. The salt spray simulation test equipment for coating detection according to claim 1, characterized in that, A support frame for restricting the rotation of the top cover is fixedly installed on the barrel body. A lead screw is rotatably arranged on the support frame. The lead screw is above the barrel body, and the bottom end of the lead screw extends into the upper inner part of the barrel body. The rotation driving member is in transmission connection with the lead screw. A through hole is opened in the middle of the top cover. Two first balls are rotatably arranged on the side wall of the through hole. The two first balls are arranged oppositely. A connecting sleeve is coaxially and rotatably arranged at the bottom of the top cover. A through hole is also opened in the middle of the connecting sleeve. Two second balls are rotatably arranged on the inner wall of the through hole of the connecting sleeve. The two second balls are arranged oppositely. A lower circular groove is opened in the lower part of the lead screw. The plane where the lower circular groove is located is the same as the plane where the top cover is located. The lower circular groove is above the bottom of the spiral groove. The distance between the lower circular groove and the bottom of the spiral groove is the same as the distance between the first ball and the second ball. A top circular groove is opened at the top of the lead screw. The top circular groove is communicated with the top of the spiral groove. The first ball, the second ball, and the spiral groove, the lower circular groove, and the top circular groove cooperate, and the clamping rack is circularly and arrayedly arranged on the connecting sleeve.

4. The salt spray simulation test equipment for coating detection according to claim 1, characterized in that, The clamping unit includes a connecting rod, an upper clamping rod, and a lower clamping rod. The lower clamping rod is fixedly connected to the connecting rod. The upper clamping rod elastically slides on the connecting rod through an elastic sliding component. The upper clamping rod is above the lower clamping rod.

5. The salt spray simulation test equipment for coating detection according to claim 4, characterized in that, A backing plate is fixedly connected to the connecting rod.

6. The salt spray simulation test equipment for coating detection according to claim 4, characterized in that, The elastic sliding component includes: a sliding groove, a sliding block, and a spring. The sliding groove is opened on the connecting rod. The sliding block slides inside the sliding groove. The sliding direction of the sliding block is the same as the clamping direction. A spring is arranged inside the sliding groove. The spring makes the sliding block slide towards the lower clamping rod. The upper clamping rod is fixedly connected to the sliding block.

7. The salt spray simulation test equipment for coating detection according to claim 6, characterized in that, A connecting side plate is fixedly arranged on the upper clamping rod. A connecting hole is opened on the side wall of the connecting side plate. A screw passes through the connecting hole and is fixed on the sliding block. The connecting side plate covers the outer surface of the sliding groove.

8. The salt spray simulation test equipment for coating detection according to claim 7, characterized in that, The connecting hole includes a cylindrical part and a multi-faceted part. An embedded block is arranged on the sliding block. The embedded block includes a circular and multi-faceted protrusion. The circular and multi-faceted protrusion of the embedded block and the cylindrical part and multi-faceted part of the connecting hole are nested and matched.

9. The salt spray simulation test equipment for coating detection according to claim 4, characterized in that, A sealing buffer ring is arranged at the bottom edge of the top cover.

10. The salt spray simulation test equipment for coating detection according to claim 4, characterized in that, A convex block is arranged on the side wall of the top cover. The convex block cooperates with the support frame to restrict the rotation of the top cover.

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