A vertical spraying device for aluminum profiles

Abstract

The present invention discloses a vertical spraying device for aluminum profiles, which relates to the technical field of aluminum profile processing, including a stand and a folding frame, wherein a spraying mechanism is arranged in an array on the folding frame, wherein the spraying mechanism includes a spray gun nozzle, an electrostatic component and a tail pipe, wherein the outer wall of the tail pipe is provided with a temperature regulating component, wherein the temperature regulating component includes an interlayer sleeve, wherein an electric heating wire is provided inside the interlayer sleeve, and the top end of the interlayer sleeve is connected to a feeding pipe. The present invention provides a temperature regulating component for heating at the tail end of the spraying device, and utilizes the electric heating wire to increase the temperature of the solvent additive such as isopropyl alcohol inside, wherein the isopropyl alcohol provides an indirect heating function for the tail pipe and the coating wrapped inside, and the coating can reduce its viscosity by appropriately increasing its temperature, improve its fluidity in the transportation of the spraying device, ensure the constant spraying flow and spraying pressure of the coating, and improve the spraying effect.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum profile processing, in particular to a vertical spraying device for aluminum profiles. Background Art

[0002] With the development of modern spraying technology, electrostatic powder spraying technology with advantages such as high efficiency, good economic benefits and environmental protection has gradually become the mainstream trend. The principle of electrostatic powder spraying is the effect of electrostatic field on electric charge: the workpiece is grounded as the anode and the spray gun is used as the cathode, that is, a negative voltage is applied to the spray gun to form an electrostatic field between the spray gun and the workpiece. When the powder is sprayed from the spray gun, it carries a negative charge. Under the action of the electric field force, the powder particles adhere to the workpiece to form a uniform film.

[0003] For example, the "aluminum profile vertical spray booth spraying system" with patent publication number: CN107442347A includes a vertical spray booth composed of curtains, and the vertical spray booth is composed of three curtains, adjacent curtains are arranged vertically, and there are gaps between adjacent curtains; the vertical spray booth is connected from top to bottom, and the lower end of the vertical spray booth is connected to a recovery device; it includes longitudinally arranged powder spraying columns, and nozzles arranged side by side laterally are movably connected to the powder spraying columns, and the nozzles are accommodated in the vertical spray booth formed by the curtains; a powder spray recovery duct is arranged outside the gap, and the powder spray recovery duct is arranged from top to bottom along the gap and is connected to a recovery fan, the recovery fan is connected to a powder supply center, and the powder supply center is connected to the nozzle.

[0004] The uniformity of coating thickness is the most important evaluation criterion for electrostatic powder spraying of aluminum profiles. If the film thickness on the profile surface varies greatly, it will cause orange peel and bulges, which will directly affect the product quality. In practice, in order to obtain a uniform coating, companies usually determine the parameters of powder spraying based on experience and conduct test spraying to determine the uniformity of the coating on the workpiece surface. The uniformity of the coating is affected by many factors, including the tension and viscosity of the coating, the flow rate of the coating, the electrostatic voltage, and the spacing between the spray guns. Among them, the tension and viscosity of the coating will also affect the leveling of the coating on the workpiece.

[0005] However, in the prior art, in order to allow the paint to have better leveling and molding effects after being attached to the workpiece, the tension and viscosity of the paint need to be controlled within a certain range. However, in the spraying equipment, the tension and viscosity of the paint will affect the normal transportation of the paint to a certain extent, causing the paint flow and internal pressure to be affected, resulting in the electrostatic spraying effect being affected. How to ensure that the paint is leveled and formed on the surface of the aluminum profile while improving the paint supply efficiency in the spraying equipment is an important issue that needs to be urgently solved for electrostatic spraying equipment. Summary of the invention

[0006] The object of the present invention is to provide a vertical spraying device for aluminum profiles to solve the problem of ensuring that the paint is leveled and formed on the surface of the aluminum profile while improving the paint supply efficiency in the spraying equipment as proposed in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a vertical spraying device for aluminum profiles, comprising a stand and a folding frame, a spraying mechanism arranged in an array on the folding frame, the spraying mechanism comprising a spray gun nozzle, an electrostatic component and a tail pipe, the outer wall of the tail pipe is provided with a temperature regulating component, the temperature regulating component comprises an interlayer sleeve, an electric heating wire is arranged inside the interlayer sleeve, the top of the interlayer sleeve is connected to a feeding pipe, both ends of the electric heating wire penetrate the outer wall of the interlayer sleeve and are connected with electrode contacts, one end of the interlayer sleeve is fixedly connected to a limiting pressure ring, the side wall of the pressure limiting ring is fixedly connected to an air guide tube, one side of the electric heating wire is provided with a retaining ring, the retaining ring is fixedly connected to the inner wall of the interlayer sleeve, the electrostatic component comprises a reducer, one end of the reducer is fixedly connected to the tail pipe, the other end of the reducer is fixedly connected to the spray gun nozzle, the outer wall of the reducer is fixedly connected to a magnetic pole plate and an electrostatic generator, and the electrostatic generator is used to give electrostatic charge to the powder passing through the reducer.

[0008] The overall spraying process of aluminum profiles is: loading, pretreatment, electrostatic spraying, heating and curing, and unloading. First, the aluminum profile is hung up, and then after a series of treatments such as degreasing, rust removal, phosphating, passivation, etc., the aluminum profile is transported from the loading area to the painting area through a transportation device. Start the spraying device, and supply paint and power to the spraying device at the same time. The paint is negatively charged under the action of the high-voltage power supply. Since the paint has the same charge, under the repulsive force of the same charge, the paint is evenly filled in the cavity of the spray gun nozzle. At the same time, the aluminum profile is grounded to form an electrostatic potential between the spraying device and the workpiece. When the negatively charged paint particles fly toward the workpiece, the positive charge on the surface of the workpiece will attract the negatively charged paint particles. Because opposite charges attract each other, this attraction causes the paint particles to be evenly adsorbed on the surface of the workpiece.

[0009] The magnetic pole plate is used to provide a transverse magnetic field in the reducer. An electric control mechanism is provided on one side of the spraying mechanism. The electric control mechanism is used to provide electric energy for the normal operation of the magnetic pole plate, the electrostatic generator and the electric heating wire. The temperature regulating component is wrapped in the outer layer of the tail pipe. The flowing paint is passed into the tail pipe. The spraying auxiliary agent with a certain volatilization effect is passed into the temperature regulating component. The auxiliary agent is added into the interlayer of the interlayer sleeve through the feeding pipe. After the electric heating wire is connected to the power supply, the electric heating wire heats the liquid in the interlayer sleeve, so that the interlayer sleeve It provides indirect heating with constant temperature for the tail pipe, thereby reducing the viscous resistance of the paint in the tail pipe, electrostatic components and spray gun nozzle. In addition, when the additive is heated, part of the liquid evaporates to form gas, which escapes outward through the gap of the baffle ring and is guided by the air guide to the inner wall of the tail pipe. The gas additive mixes into the edge area of ​​the paint to form a barrier film layer between the paint and the inner wall, reducing the viscosity of the inner wall of the container and the paint. Finally, it cools to form a solvent that mixes into the paint to assist the paint in drying and setting quickly.

[0010] Preferably, the electric control mechanism includes a protective shell, a limit assembly, a negative pressure regulation assembly and a sliding rheostat, the sliding rheostat is electrically connected to the electrode contact, the limit assembly is used to move the sliding contact of the sliding rheostat, the sliding rheostat controls the resistance value of the connected circuit through the limit assembly, and the negative pressure regulation assembly controls the movement of the limit assembly through negative pressure.

[0011] Preferably, the negative pressure regulating component comprises a negative pressure tube, one end of which is connected to the spray gun nozzle, and the other end of which is connected to a sealing cone bucket, and an elastic diaphragm is fixedly connected to the inner wall of the sealing cone bucket.

[0012] Preferably, the outer side wall of the elastic diaphragm is fixedly connected to a round support sheet, a connecting rod is fixedly connected to the center of the side wall of the round support sheet, one end of the connecting rod is fixedly connected to a top block 2, and the outer side wall of the connecting rod is fixedly connected to a U-shaped frame.

[0013] Preferably, the limiting assembly comprises an inner shrink tube, the inner side wall of the inner shrink tube is slidably connected with an inner sleeve, the outer side wall of the inner sleeve is provided with four ball grooves, and embedded balls are movably embedded inside the ball grooves.

[0014] Preferably, a top block 1 is provided inside the inner sleeve, one side of the top block 1 is fixedly connected to a limiting column, the outer side wall of the limiting column is provided with a spring, one end of the spring is fixedly connected to the top block 1, and the other end of the spring is fixedly connected to the inner side wall of the inner sleeve.

[0015] Preferably, the outer wall of the inner sleeve is fixedly connected to a push rod, the outer wall of the push rod is movably hinged to a lever arm, the outer wall of the inner shrinkage tube is fixedly connected to a support arm, the lever arm is movably hinged to the support arm, and one end of the U-shaped frame is sleeved on the outer wall of the lever arm.

[0016] Preferably, the inner side wall of the magnetic pole plate is embedded in the inner side wall of the reducer, and a cross groove is provided on the inner side wall of the magnetic pole plate, and the other end of the cross groove is connected to the outer side wall of the magnetic pole plate.

[0017] Preferably, the interior of the cross dark groove is filled with cobalt powder as a quick-drying auxiliary agent for spraying, and the interior of the interlayer sleeve is filled with isopropyl alcohol as a solvent auxiliary agent for spraying.

[0018] Preferably, a leak-proof valve is provided at the top end of the feeding pipe, and a sealing cover is installed at the top opening of the feeding pipe.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the present invention, a temperature regulating component for providing heating is provided at the tail end of the spraying device, and an electric heating wire is used to increase the temperature of the internal solvent additives such as isopropyl alcohol. The isopropyl alcohol provides an indirect heating function for the tail pipe and the coating wrapped inside. Properly increasing the temperature of the coating can reduce its viscosity, improve its fluidity in transportation in the spraying device, ensure the constant spraying flow and spraying pressure of the coating, and improve the spraying effect.

[0021] 2. In the present invention, the boiling point of isopropanol is 50-100°C. During indirect heating, part of the solvent additive evaporates and is guided by the gas guide tube. The formed gas flows into the inner wall of the tail pipe to isolate the paint with higher viscosity from direct contact with the inner wall of the spraying device. At the same time, the gaseous isopropanol can also promote the paint to flow in the spraying device, further improve the fluidity of the paint, and improve the spraying effect.

[0022] 3. In the present invention, a solvent auxiliary agent is formed by mixing isopropyl alcohol with the coating for a period of time. Isopropyl alcohol is a volatile auxiliary agent and can be used to adjust the drying speed and fluidity of the coating, thereby improving the forming effect of spraying paint on the surface of the aluminum profile. At the same time, during the flow of the coating, the negative pressure generated by the flow is used to carry away the cobalt powder adsorbed on the inner wall of the magnetic pole plate. The cobalt powder, as a metal drying agent, can promote the drying reaction of the coating, thereby also improving the forming effect of spraying paint on the surface of the aluminum profile.

[0023] 4. In the present invention, when the paint flows through the reducer, the electrostatic generator makes the paint carry a negative charge. When the charged paint passes through the magnetic field formed by the two magnetic pole plates, it is affected by the upward Lorentz force, which makes the paint concentrate upward, avoiding the direct collision of the paint with the inner wall of the spraying device, reducing the inner wall resistance at the neck of the spray gun nozzle and the reducer, further reducing the kinetic energy loss of the fluid at the nozzle, and improving the smoothness of the spraying.

[0024] 5. In the present invention, a negative pressure tube is installed at the nozzle of the spray gun, and negative pressure is generated by utilizing the high flow rate of the paint at the nozzle of the spray gun. When the flow rate decreases due to the viscosity of the paint, the negative pressure of the negative pressure tube decreases, causing the position of the push rod to change. The push rod is used to control the sliding contact of the sliding rheostat, thereby controlling the amount of electricity connected to the electric heating wire, thereby feedback-adjusting the indirect heating of the temperature regulating component, so that the viscosity of the paint passing through the spraying device is always within an appropriate range. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional structural schematic diagram of a vertical spraying device for aluminum profiles of the present invention;

[0026] Figure 2 The structure diagram of the spraying mechanism and the electric control mechanism in the vertical spraying device for aluminum profiles of the present invention is shown in FIG. Figure 1 ;

[0027] Figure 3 The structure diagram of the spraying mechanism and the electric control mechanism in the vertical spraying device for aluminum profiles of the present invention is shown in FIG. Figure 2 ;

[0028] Figure 4 It is a schematic diagram of the internal structure of an electric control mechanism in a vertical spraying device for aluminum profiles of the present invention;

[0029] Figure 5 It is a structural schematic diagram of a limit assembly and a negative pressure regulating assembly in a vertical spraying device for aluminum profiles of the present invention;

[0030] Figure 6 It is a schematic diagram of the internal structure of a limit assembly and a negative pressure regulating assembly in a vertical spraying device for aluminum profiles of the present invention;

[0031] Figure 7 This is a schematic diagram of the internal structure of a temperature regulating component in a vertical spraying device for aluminum profiles of the present invention;

[0032] Figure 8 It is a side cross-sectional view of a temperature regulating component in a vertical spraying device for aluminum profiles of the present invention;

[0033] Fig. 9 It is a working principle diagram of the charged paint being collected at the spray gun nozzle in a vertical spraying device for aluminum profiles of the present invention;

[0034] Fig.10 It is a working principle diagram of the mixing process of charged paint and cobalt powder in a vertical spraying device for aluminum profiles of the present invention;

[0035] Fig.11 This is a working principle diagram of a solvent additive promoting the flow of coating in a vertical spraying device for aluminum profiles of the present invention;

[0036] Fig.12 The present invention is a working principle diagram of a limit assembly and a negative pressure regulating assembly in a vertical spraying device for aluminum profiles under different negative pressures.

[0037] In the figure: 1. stand; 2. folding frame; 3. spraying mechanism; 31. spray gun nozzle; 32. electrostatic assembly; 321. reducer; 322. magnetic pole plate; 323. electrostatic generator; 324. cross dark groove; 33. tail pipe; 34. temperature regulating assembly; 341. sandwich sleeve; 342. electrode contact; 343. feeding pipe; 344. air guide tube; 345. pressure limiting ring; 346. electric heating wire; 347. retaining ring; 4. electric control mechanism; 41. protection Shell; 42, limit assembly; 421, retracted tube; 422, inner sleeve; 423, embedded ball; 424, top block one; 425, limit column; 426, spring; 427, push rod; 428, support arm; 43, negative pressure control assembly; 431, negative pressure tube; 432, elastic diaphragm; 433, round support piece; 434, connecting rod; 435, U-shaped frame; 436, lever arm; 437, top block two; 438, sealed cone bucket; 44, sliding rheostat. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Example 1: Reference Figure 1 - Fig.12As shown: A vertical spraying device for aluminum profiles, including a stand 1 and a folding frame 2, a spraying mechanism 3 is arranged in an array on the folding frame 2, the spraying mechanism 3 includes a spray gun nozzle 31, an electrostatic component 32 and a tail pipe 33, the outer wall of the tail pipe 33 is provided with a temperature regulating component 34, the temperature regulating component 34 includes an interlayer sleeve 341, an electric heating wire 346 is arranged inside the interlayer sleeve 341, the top end of the interlayer sleeve 341 is connected to the feeding pipe 343, both ends of the electric heating wire 346 penetrate the outer wall of the interlayer sleeve 341 and are connected to electrode contacts 342, one end of the interlayer sleeve 341 is fixedly connected to a limiting pressure ring 345, the side wall of the limiting pressure ring 345 is fixedly connected to an air guide tube 344, and the electric heating wire 346 A retaining ring 347 is provided on one side, and the retaining ring 347 is fixedly connected to the inner wall of the interlayer sleeve 341. The electrostatic component 32 includes a reducer 321, one end of the reducer 321 is fixedly connected to the tail pipe 33, and the other end of the reducer 321 is fixedly connected to the spray gun nozzle 31. The outer wall of the reducer 321 is fixedly connected with a magnetic pole plate 322 and an electrostatic generator 323. The electrostatic generator 323 is used to give electrostatic charge to the powder passing through the reducer 321, and the magnetic pole plate 322 is used to provide a transverse magnetic field in the reducer 321. An electric control mechanism 4 is provided on one side of the spraying mechanism 3, and the electric control mechanism 4 is used to provide electrical energy for the normal operation of the magnetic pole plate 322, the electrostatic generator 323 and the electric heating wire 346.

[0040] The entire vertical spraying device is as follows Figure 1 As shown, multiple spray mechanisms arranged in an array are vertically installed on a stand. The connecting rod between the spray mechanism and the folding frame is a hollow rod. The position of the connecting rod is adjustable and is suitable for aluminum profiles of various sizes. A duct for conveying paint is arranged inside, and a wire is additionally arranged on the outer edge of the connecting rod. An electric control box and an electric control circuit are installed inside the stand. The upper computer of the electric control circuit (including a computer and its equipment containing a control program) is located at the base of the stand. A touch screen can be installed on the outer wall of the stand for inputting control commands. The lower computer of the electric control circuit (including electrical components such as an electrostatic generator and electric heating wire) is located in each electric control mechanism.

[0041] In this embodiment, the device adopts the spraying method of electrostatic spraying, and part of the electric energy input into the electric control mechanism 4 is provided to the electrostatic generator 323. The power source transmitted to the electrostatic generator 323 is a high-voltage power source, which generates a strong electric field inside the electrostatic component 32, so that the paint passing through the electrostatic component 32 is negatively charged. The final effect of electrostatic spraying is also related to the tension and viscosity of the paint; when the tension and viscosity of the paint are too small, the adhesion effect of the paint on the surface of the aluminum profile is poor, and it is easy to produce orange peel, paint slip and other defects; when the tension and viscosity of the paint are too large, it is also easy to produce orange peel or even cracking of the coating.

[0042] Therefore, the paint supplied to the tail pipe 33 needs to maintain a certain viscosity. The viscosity of the paint in the spraying equipment easily affects the flow and delivery effect, resulting in insufficient pressure and speed delivered to the spray gun nozzle 31, which cannot meet the molding conditions and spraying conditions of the electrostatic paint. Proper preheating of the paint can eliminate its viscosity resistance and ensure the pressure and speed of the feed. Fig.11 , m represents the coating entering the spraying mechanism 3, n1 represents the solvent additive in the gas state (mainly represented by isopropyl alcohol), n2 represents the solvent additive in the liquid state (mainly represented by isopropyl alcohol), the temperature regulating component 34 is wrapped in the outer layer of the tail pipe 33, the flowing coating is passed into the tail pipe 33, the spraying additive with a certain volatilization effect is passed into the temperature regulating component 34, the additive is added to the interlayer of the interlayer sleeve 341 through the feeding pipe 343, after the electric heating wire 346 is connected to the power supply, the electric heating wire 346 heats the liquid in the interlayer sleeve 341, so that the interlayer sleeve 341 provides a constant temperature indirect heating effect for the tail pipe 33, thereby reducing the viscous resistance of the coating in the tail pipe 33, the electrostatic component 32 and the spray gun nozzle 31.

[0043] In addition, when the additive is heated, part of the liquid evaporates to form gas, which escapes outward through the gap of the baffle ring 347 and is blown to the inner wall of the tail pipe 33 through the guidance of the air guide tube 344. The gas additive mixes into the edge area of ​​the coating to form a barrier film layer between the coating and the inner wall, reducing the viscosity of the inner wall of the container and the coating. Finally, it cools to form a solvent that mixes into the coating to help the coating dry quickly and set.

[0044] The spray gun nozzle 31, the reducer 321 and the tail pipe 33 are integrally formed, and the end near the spray gun nozzle 31 is inwardly contracted. The spray gun nozzle 31 is at the minimum position of the inner diameter of the cavity of the spraying mechanism 3. The magnetic pole plate 322 is installed on the outer side of the reducer 321. The magnetic pole plate 322 provides a horizontal transverse magnetic field. Fig. 9 As explained, after the paint is charged, the paint particles move in a directional manner under the constraints of the external electrostatic potential and the internal container pressure, and the Lorentz force is generated when passing through the magnetic pole plate 322 area. The Lorentz force provides an upward kinetic force, allowing the paint to be concentrated upward, reducing the inner wall resistance at the constriction where the spray gun nozzle 31 and the reducer 321 are connected, further reducing the kinetic energy damage of the fluid at the nozzle, and improving the smoothness of the spraying.

[0045] Embodiment 2: According to Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, in this embodiment, the electric control mechanism 4 includes a protective shell 41, a limit component 42, a negative pressure regulation component 43 and a sliding rheostat 44. The sliding rheostat 44 is electrically connected to the electrode contact 342. The limit component 42 is used to move the sliding contact of the sliding rheostat 44. The sliding rheostat 44 controls the resistance value of the connected circuit through the limit component 42. The negative pressure regulation component 43 controls the movement of the limit component 42 through negative pressure.

[0046] The negative pressure regulating assembly 43 includes a negative pressure pipe 431, one end of which is connected to the spray gun nozzle 31, and the other end of the negative pressure pipe 431 is connected to a sealing cone 438, and the inner wall of the sealing cone 438 is fixedly connected to an elastic diaphragm 432. The outer wall of the elastic diaphragm 432 is fixedly connected to a round support piece 433, and a connecting rod 434 is fixedly connected at the center of the side wall of the round support piece 433, one end of the connecting rod 434 is fixedly connected to a top block 437, and the outer wall of the connecting rod 434 is fixedly connected to a U-shaped frame 435.

[0047] In this embodiment, according to the Bernoulli principle and the principle of fluid continuity, the flow rate of the paint will be greatly increased when it passes through the spray gun nozzle 31, and the greater the flow rate, the greater the negative pressure effect. When the viscosity of the fluid in the spray mechanism 3 is normal, the paint passes through the spray gun nozzle 31 and is supplied to the outside at a higher flow rate. After the paint is sprayed out from the nozzle, its pressure and temperature drop sharply, so that its viscosity increases and returns to a normal state so that it can adhere to the surface of the workpiece and form. The elastic diaphragm 432 is sealed at the port of the negative pressure tube 431. The pressures at both ends are the external atmospheric pressure and the negative pressure generated by the flow of the paint. The elastic diaphragm 432 is made of a deformable and highly elastic material, and the degree of inward depression of the elastic diaphragm 432 is determined by the negative pressure value.

[0048] Refer to the attached Fig.12 As explained, when the parameters in the spraying equipment are not within the normal range, the viscosity of the paint entering the spraying equipment increases, resulting in a decrease in the flow rate in the spray gun nozzle 31, thereby resulting in a decrease in the negative pressure generated in the negative pressure tube 431, resulting in a decrease in the degree of inward depression of the elastic diaphragm 432, so that the connecting rod 434 drives the U-shaped frame 435 to be ejected outward, and the U-shaped frame 435, the top block 437 and the spring 426 form a lever structure. The extended position of the U-shaped frame 435 can also control the extended length of the ejector rod 427, causing the resistance value of the sliding rheostat 44 connected to the circuit to change, thereby adjusting the current of the electric heating wire 346, so that the heating temperature of the electric heating wire 346 increases, and the heating effect of the paint in the tail pipe 33 stage is increased, so that the viscosity of the paint is adjusted to a state suitable for spraying.

[0049] Embodiment 3: According to Figure 5 , Figure 6 and Figure 7As shown, in this embodiment, the limit assembly 42 includes an inner shrink tube 421, the inner side wall of the inner shrink tube 421 is slidably connected to an inner sleeve 422, the outer side wall of the inner sleeve 422 is provided with four ball grooves, and the inner side of the ball groove is movably embedded with an embedded ball 423. A top block 424 is arranged inside the inner sleeve 422, one side of the top block 424 is fixedly connected to a limit column 425, and a spring 426 is arranged on the outer side wall of the limit column 425, one end of the spring 426 is fixedly connected to the top block 424, and the other end of the spring 426 is fixedly connected to the inner side wall of the inner sleeve 422. A top rod 427 is fixedly connected to the outer side wall of the inner sleeve 422, and a lever arm 436 is movably hinged to the outer side wall of the top rod 427, and a support arm 428 is fixedly connected to the outer side wall of the inner shrink tube 421, and the lever arm 436 is movably hinged to the support arm 428, and one end of the U-shaped frame 435 is sleeved with the outer side wall of the lever arm 436.

[0050] In this embodiment, four ball grooves are arranged on the outer side of the inner sleeve 422, and the positions of the four embedded balls 423 in the ball grooves can be flexibly adjusted. The inner sleeve 422 can realize the positioning function with the inner shrink tube 421 by cooperating with the embedded balls 423. The limiting assembly 42 can be divided into two parts according to the movement mode: the inner shrink tube 421 and the support arm 428 are integrated, and a protective sleeve is fixedly sleeved on the outer side of the inner shrink tube 421, and the protective sleeve is fixedly connected to the sealing cone bucket 438. The protective sleeve and the sealing cone bucket 438 are connected to the outer wall of the spray mechanism 3 through a frame rod, so the positions of the inner shrink tube 421 and the support arm 428 remain fixed; the inner sleeve 422 and the top rod 427 are integrated, and slide at the axis of the inner shrink tube 421. The top block 424 and the limiting column 425 move with the inner sleeve 422, but they maintain a certain elastic effect;

[0051] When the negative pressure is small and causes the second top block 437 to be inserted into the interior of the limiting component 42, the top rod 427 and the inner sleeve 422 are moved toward the round support piece 433 under the action of the lever, causing the second top block 437 to be inserted into the interior of the inner sleeve 422 and squeeze the embedded balls 423 on all sides, and use the embedded balls 423 to temporarily limit the inner sleeve 422. When the negative pressure is large, the connecting rod 434 moves away from the limiting component 42, causing the second top block 437 to be separated from the inner sleeve 422. After the inner sleeve 422 is no longer limited, the U-shaped frame 435 controls the top rod 427 to move toward the sliding rheostat 44 through the lever arm 436, thereby pushing open the sliding contact of the sliding rheostat 44 to adjust the current connected to the electric heating wire 346, thereby increasing the liquid temperature inside the interlayer sleeve 341 and reducing the viscous resistance of the paint in the spraying equipment.

[0052] Embodiment 4: According to Figure 2 , Figure 3 , Figure 8 and Fig.11As shown, in this embodiment, the inner wall of the magnetic pole plate 322 is embedded in the inner wall of the reducer 321, and the inner wall of the magnetic pole plate 322 is provided with a cross dark groove 324, and the other end of the cross dark groove 324 is connected to the outer wall of the magnetic pole plate 322. The interior of the cross dark groove 324 is filled with cobalt powder as a quick-drying auxiliary agent for spraying, and the interior of the interlayer sleeve 341 is filled with a solvent auxiliary agent for spraying with isopropyl alcohol. A leak-proof valve is provided at the top of the feeding pipe 343, and a sealing cover is installed at the top of the feeding pipe 343.

[0053] In this embodiment, the interlayer sleeve 341 is an internally sealed cavity. After heating, part of the liquid evaporates. The internal pressure of the interlayer sleeve 341 is greater than the external atmospheric pressure, and the raw materials are added and replenished through the feeding pipe 343. In order to prevent the leakage of raw materials, a leak-proof valve is provided at the feeding pipe 343, which has the same principle as the tire inflation nozzle to prevent the leakage of raw materials when replenishing auxiliary raw materials. Installing a rubber plug on the top of the feeding pipe 343 can also effectively prevent leakage.

[0054] At the same time, when there is too much liquid in the interlayer sleeve 341, it is easy to escape from the air guide tube 344. A pressure limiting ring 345 is installed at the air guide tube 344 and the interlayer sleeve 341. Since it is configured as a constricted structure, it can effectively prevent the leakage of liquid raw materials. When the amount of gas evaporated inside the interlayer sleeve 341 reaches a certain amount, the high pressure inside the interlayer sleeve 341 will prompt the gas to be discharged from the pressure limiting ring 345, forming a stable airflow.

[0055] A comb-shaped cross dark groove 324 is provided inside the magnetic pole plate 322. The feeding port of the cross dark groove 324 is connected to the outside of the magnetic pole plate 322. The feeding port is sealed by a sealing plug. Fig.10 , x represents cobalt powder, and cobalt powder raw materials are added to the cross dark groove 324. The magnetic pole plate 322 has a magnetic attraction to the cobalt powder. The cobalt powder is tightly attached to the inner wall of the magnetic pole plate 322. When the flow rate of the paint in the reducer 321 is too large, the negative pressure can be used to separate the cobalt powder from the magnetic pole plate 322, and finally fully mixed with the paint. The cobalt powder, as a quick-drying auxiliary agent for electrostatic spraying, can effectively assist the paint to be fixed on the workpiece and avoid the problem of paint slip flow.

[0056] The use method and working principle of the device are as follows: first, a sufficient amount of paint raw materials is added to the paint tube, a sufficient amount of solvent additives is added to the interlayer sleeve 341, and a sufficient amount of cobalt powder is added to the magnetic pole plate 322. The aluminum profile is pre-treated and passed through the spraying device. The paint is added to the tail pipe 33 through the conduit. The power supply is connected to the protective shell 41 through the wire. The electric heating wire 346 is energized to heat the solvent additives inside the interlayer sleeve 341, so that the viscosity of the paint passing through the tail pipe 33 is reduced, which is conducive to the transportation of the paint in the spray gun nozzle 31 and the generation of static electricity;

[0057] At the same time, the temperature of the solvent additive increases, causing partial evaporation, thereby increasing the air pressure inside the interlayer sleeve 341, causing excess gas to escape from the pressure limiting ring 345 and flow into the paint at the entrance of the tail pipe 33 through the guiding effect of the air guide tube 344, forming an isolation between the outer side of the paint and the inner wall of the tail pipe 33, further reducing the influence of viscous resistance;

[0058] Then, the paint flows from the tail pipe 33 to the reducer 321, and the electrostatic generator 323 causes the paint to be negatively charged. The charged paint flows further, and under the action of the magnetic field of the magnetic pole plate 322, the paint at the bottom is gathered upward and flows out to the spray gun nozzle 31, reducing the inner wall resistance of the cavity at the constriction. When the paint flows, part of the cobalt powder is taken away and mixed into the paint to be used as a quick-drying aid.

[0059] Finally, the paint passes through the spray gun nozzle 31 and is sprayed toward the workpiece under the action of pressure and electrostatic potential. At the spray gun nozzle 31, there is a negative pressure regulating component 43 for feedback regulation. When the viscosity of the paint is too large, the deformation of the elastic diaphragm 432 is small, causing the connecting rod 434 to move toward the negative pressure regulating component 43, and the top block 437 is inserted into the inner sleeve 422. The top block 437 is used to drive the lever arm 436 to move. The movement of the top rod 427 is adjusted by the lever principle, and the expanded embedded ball 423 limits the inner sleeve 422, so that the sliding contact position of the sliding rheostat 44 changes, and the amount of electricity passed into the lever arm 436 is adjusted to make the internal paint flow more smoothly inside the spray gun, ensuring that the paint in the spraying device is sprayed onto the aluminum profile in a stable state.

[0060] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vertical spraying device for aluminum profiles, comprising a stand (1) and a folding frame (2), wherein a spraying mechanism (3) is arranged in an array on the folding frame (2), characterized in that: The spraying mechanism (3) comprises a spray gun nozzle (31), an electrostatic component (32) and a tail pipe (33); the outer wall of the tail pipe (33) is provided with a temperature regulating component (34); the temperature regulating component (34) comprises an interlayer sleeve (341); an electric heating wire (346) is provided inside the interlayer sleeve (341); the top end of the interlayer sleeve (341) is connected to the feeding pipe (343); both ends of the electric heating wire (346) penetrate the outer wall of the interlayer sleeve (341) and are connected to electrode contacts (342); one end of the interlayer sleeve (341) is fixedly connected to a limiting pressure ring (345); the side wall of the limiting pressure ring (345) is fixedly connected to an air guide cylinder (344); a retaining ring (347) is provided on one side of the electric heating wire (346); the retaining ring (347) is fixedly connected to the inner wall of the interlayer sleeve (341); The electrostatic component (32) comprises a reducer (321), one end of the reducer (321) is fixedly connected to the tail pipe (33), the other end of the reducer (321) is fixedly connected to the spray gun nozzle (31), the outer wall of the reducer (321) is fixedly connected with a magnetic pole plate (322) and an electrostatic generator (323), the electrostatic generator (323) is used to impart electrostatic charge to powder passing through the reducer (321), the magnetic pole plate (322) is used to provide a transverse magnetic field in the reducer (321), and an electric control mechanism (4) is provided on one side of the spraying mechanism (3), the electric control mechanism (4) is used to provide electric energy for the operation of the magnetic pole plate (322), the electrostatic generator (323) and the electric heating wire (346).

2. The vertical spraying device for aluminum profiles according to claim 1, characterized in that: The electric control mechanism (4) comprises a protective shell (41), a limit assembly (42), a negative pressure regulating assembly (43) and a sliding rheostat (44); the sliding rheostat (44) is electrically connected to the electrode contact (342); the limit assembly (42) is used to move the sliding contact of the sliding rheostat (44); the sliding rheostat (44) controls the resistance value of the connected circuit through the limit assembly (42); and the negative pressure regulating assembly (43) controls the movement of the limit assembly (42) through negative pressure.

3. The vertical spraying device for aluminum profiles according to claim 2, characterized in that: The negative pressure regulating component (43) comprises a negative pressure tube (431), one end of the negative pressure tube (431) being connected to the spray gun nozzle (31), and the other end of the negative pressure tube (431) being connected to a sealing cone bucket (438), and an elastic diaphragm (432) being fixedly connected to the inner side wall of the sealing cone bucket (438).

4. The vertical spraying device for aluminum profiles according to claim 3 is characterized in that: The outer side wall of the elastic diaphragm (432) is fixedly connected to a round support sheet (433), a connecting rod (434) is fixedly connected to the center of the side wall of the round support sheet (433), one end of the connecting rod (434) is fixedly connected to a second top block (437), and the outer side wall of the connecting rod (434) is fixedly connected to a U-shaped frame (435).

5. The vertical spraying device for aluminum profiles according to claim 4, characterized in that: The limit assembly (42) comprises an inner shrink tube (421), the inner side wall of the inner shrink tube (421) being slidably connected to an inner sleeve (422), the outer side wall of the inner sleeve (422) being provided with four ball grooves, and inner balls (423) being movably embedded in the ball grooves.

6. The vertical spraying device for aluminum profiles according to claim 5, characterized in that: A top block 1 (424) is disposed inside the inner sleeve (422), one side of the top block 1 (424) is fixedly connected to a limiting column (425), an outer side wall of the limiting column (425) is provided with a spring (426), one end of the spring (426) is fixedly connected to the top block 1 (424), and the other end of the spring (426) is fixedly connected to the inner side wall of the inner sleeve (422).

7. The vertical spraying device for aluminum profiles according to claim 6, characterized in that: The outer wall of the inner sleeve (422) is fixedly connected to a push rod (427), the outer wall of the push rod (427) is movably hinged to a lever arm (436), the outer wall of the inner shrink tube (421) is fixedly connected to a support arm (428), the lever arm (436) is movably hinged to the support arm (428), and one end of the U-shaped frame (435) is sleeved with the outer wall of the lever arm (436).

8. The vertical spraying device for aluminum profiles according to claim 1, characterized in that: The inner side wall of the magnetic pole plate (322) is embedded in the inner side wall of the reducer tube (321), and the inner side wall of the magnetic pole plate (322) is provided with a cross-shaped groove (324).

9. The vertical spraying device for aluminum profiles according to claim 8, characterized in that: The interior of the cross dark groove (324) is filled with cobalt powder as a quick-drying auxiliary agent for spraying, and the interior of the interlayer sleeve (341) is filled with isopropyl alcohol as a solvent auxiliary agent for spraying.

10. The vertical spraying device for aluminum profiles according to claim 1, characterized in that: The top end of the feeding pipe (343) is provided with a leak-proof valve, and the top opening of the feeding pipe (343) is installed with a sealing cover.

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