A preheater based on paint viscosity reduction

Abstract

This invention relates to the field of paint spraying technology and discloses a preheater based on paint viscosity reduction. The heating cylinder has a heating rod inside its chamber, and a magnetic flux compression cleaning assembly surrounding the heating rod is also located inside the chamber. A discharge opening and closing assembly is installed between the reflux cylinder and the heating cylinder's mating port, and a scraping cleaning assembly is located inside the reflux cylinder's chamber. This invention utilizes the magnetic flux compression cleaning assembly to magnetically compress a spiral guide plate, converting magnetic attraction into downward pressure. This pressure drives the spiral guide plate to compress in a spring-like manner. Simultaneously, residual paint inside the heating chamber is compressed and scraped. Then, under the magnetic downward pressure, the opening and closing of the valve core in the discharge opening and closing assembly causes the residual paint to autonomously compress and flow back into the reflux cylinder for collection. This effectively avoids paint residue sticking to the inner wall and repeated heating causing deformation.

Description

Technical Field

[0001] This invention relates to the field of paint spraying technology, specifically a preheater based on paint viscosity reduction. Background Technology

[0002] Spray painting is a high-efficiency production method suitable for both manual and automated industrial production. It is widely used in hardware, plastics, furniture, military, and shipbuilding industries, and is currently the most common coating method. During the paint spraying process, the viscosity of the paint determines the quality of the spray. However, paint is often affected by ambient temperature, leading to reduced fluidity and hindering the spraying process. Therefore, heating devices are typically added to the paint flow lines to enhance the fluidity of the paint material. For example, existing patents disclose a paint viscosity reduction device (publication number CN111515050A) on the Chinese Patent Network. This type of device uses a cavity to hold the paint. The container is also equipped with an inlet and an outlet that connect to the cavity. The inlet is connected to the pump, and the outlet can be connected to the painting equipment. The heating component is installed on the container and can heat the paint in the cavity to reduce the viscosity of the paint. As shown in existing patent technology: According to the search, the China Patent Network discloses an electromagnetic wire paint heating device (publication announcement number CN108922688A). This type of paint heating device uses a motor, a semi-circular gear and a tooth groove to make the push tube rise. The piston can squeeze the air inside the air cylinder and discharge it between the heat preservation tank and the heating tank through the air filling pipe. This increases the air pressure on one side of the water distribution plate, so that the heating oil can flow through the conical nozzle to the other side of the water distribution plate. The flow of the heating oil can make the heating more uniform, which is beneficial to heating the paint.

[0003] However, the paint heating devices disclosed in the aforementioned patents and those currently used in the market often lack a paint recovery function after heating the paint. This results in residual paint remaining in the heating chamber. On the one hand, after condensation, it easily adheres to the inner wall of the heating device and is difficult to remove, reducing the heating space of the chamber. On the other hand, the adhered paint is prone to denaturation and scorching under cyclic heating, affecting subsequent heating of the paint. Therefore, those skilled in the art have provided a preheater based on paint viscosity reduction to solve the problems mentioned in the background art. Summary of the Invention

[0004] The purpose of this invention is to provide a preheater based on paint viscosity reduction to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a preheater based on paint viscosity reduction, comprising a heating cylinder and a reflux cylinder, wherein the reflux cylinder is installed below the heating cylinder;

[0006] The heating cylinder has a heating rod inside its chamber, and a magnetic flux compression cleaning assembly surrounding the heating rod is also provided inside its chamber.

[0007] A discharge opening and closing assembly is installed between the mating ports of the reflux cylinder and the heating cylinder, and a scraping cleaning assembly is provided inside the cavity of the reflux cylinder.

[0008] The heating rod has a heating tube installed inside its body, and a temperature control sensor is installed inside the heating rod on the side facing the heating tube.

[0009] The magnetic flux compression cleaning assembly includes a primary electromagnet ring, a secondary electromagnet ring, a tertiary electromagnet ring installed from top to bottom on the inner wall of the heating cylinder cavity, and a guide plate sleeved on the outside of the heating rod. The top of the guide plate is provided with a magnetic attraction ring sleeved on the heating rod.

[0010] As a further embodiment of the present invention: a liquid injection valve is connected to one side of the heating cylinder above the guide plate, and a liquid drain valve is connected to the other side of the heating cylinder below the guide plate.

[0011] As a further embodiment of the present invention: the guide plate is a spiral structure, and the inner and outer diameters of the spiral of the guide plate are respectively in contact with the heating rod and the heating cylinder. The spiral tail plate and the spiral top plate of the guide plate are respectively screwed and fixed to the heating rod and the magnetic iron ring by fastening bolts. The guide plate is made of spring steel.

[0012] As a further embodiment of the present invention: the primary electromagnet ring, the secondary electromagnet ring, and the tertiary electromagnet ring are all grouped in pairs, and the magnetism of the primary electromagnet ring, the secondary electromagnet ring, and the tertiary electromagnet ring increases proportionally in sequence, and the primary electromagnet ring, the secondary electromagnet ring, and the tertiary electromagnet ring are arranged at equal intervals.

[0013] As a further embodiment of the present invention: the bottom of the heating rod is fitted with an arm force push rod that passes through the heating tube, and the heating tube has a spiral structure. The top of the arm force push rod is provided with a magnet column that is directly opposite the secondary electromagnet ring and the tertiary electromagnet ring, and the bottom of the arm force push rod is fixedly connected to the opening and closing valve core in the unloading opening and closing assembly.

[0014] As a further embodiment of the present invention: the unloading opening and closing assembly includes multiple sets of guide rods arranged symmetrically in a ring on the top of the reflux cylinder chamber and an opening and closing valve core installed between the reflux cylinder and the heating cylinder mating port. Each set of guide rods has a guide sleeve sleeved on the outside of its arm, and the guide sleeve is fixedly connected to the opening and closing valve core through a crossbar. A compression spring corresponding to the guide sleeve is sleeved on the outside of the guide rod arm.

[0015] As a further embodiment of the present invention: the scraping cleaning assembly includes a rotating bushing installed in the upper half of the reflux cylinder chamber, a rotating ring frame is engaged inside the rotating shaft of the rotating bushing, and two sets of cleaning scrapers are symmetrically arranged below the rotating ring frame and fit against the inner wall of the reflux cylinder.

[0016] As a further embodiment of the present invention: a bevel gear disk is provided above the rotating ring frame, and a knob handle is installed on the upper half of the reflux cylinder, which is directly above the rotating ring frame, and a bevel gear that meshes with the bevel gear disk is installed at the output end of the knob handle.

[0017] As a further aspect of the present invention: the reflux cylinder has a conical structure, and a reflux valve is conductively connected to the bottom of the cone of the reflux cylinder.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. When preheating paint, the present invention utilizes a combination of a heating rod and a spiral guide plate to heat the paint in a spiral flow manner. This extends the heating time of the paint and ensures the comprehensiveness of the spiral flow during heating. It also ensures the uniformity of heat conduction during heating and improves the fluidity of the paint.

[0020] 2. After the paint is heated, this invention utilizes a magnetic flux compression cleaning component to magnetically compress the spiral guide plate, converting the magnetic attraction into downward pressure. This pressure drives the spiral guide plate to compress in a spring-like manner. Simultaneously, the residual paint inside the heating chamber is compressed and scraped. Then, under the magnetic downward pressure, the valve core in the unloading opening and closing component is opened and closed, causing the residual paint to be autonomously compressed and discharged into the return cylinder for collection. This effectively avoids paint residue sticking to the inner wall and repeated heating and deformation, ensuring the completeness of the emptying of residual paint after heating. This is beneficial for subsequent cyclic heating operations and ensures the high-efficiency and long-term operation of the heater. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a preheater based on paint viscosity reduction;

[0022] Figure 2 This is a schematic diagram of a preheater based on paint viscosity reduction.

[0023] Figure 3 This is a schematic diagram of the internal structure of the heating cylinder in a preheater based on paint viscosity reduction;

[0024] Figure 4 This is a schematic diagram of the flow guide plate in a preheater based on paint viscosity reduction;

[0025] Figure 5 This is a schematic diagram of the internal structure of the reflux cylinder in a preheater based on paint viscosity reduction.

[0026] In the diagram: 1. Heating cylinder; 2. Injection valve; 3. Drain valve; 4. Return cylinder; 5. Return valve; 6. Heating rod; 7. Opening / closing valve core; 8. Temperature control sensor; 9. Heating tube; 10. Guide plate; 11. Magnetic column; 12. Arm force push rod; 13. Magnetic ring; 14. Primary electromagnet ring; 15. Secondary electromagnet ring; 16. Tertiary electromagnet ring; 17. Arm force crossbar; 18. Guide rod; 19. Guide sleeve; 20. Compression spring; 21. Rotating ring frame; 22. Rotating bushing; 23. Cleaning scraper; 24. Knob handle; 25. Bevel gear; 26. Bevel gear disc. Detailed Implementation

[0027] Please see Figures 1-5 In this embodiment of the invention, a preheater based on paint viscosity reduction includes a heating cylinder 1 and a return cylinder 4. The return cylinder 4 is installed below the heating cylinder 1. A heating rod 6 is disposed inside the chamber of the heating cylinder 1. A heating tube 9 is installed inside the body of the heating rod 6, and a temperature control sensor 8 is installed on the side of the heating rod 6 facing the heating tube 9. A liquid injection valve 2 is connected to one side of the heating cylinder 1 above the guide plate 10, and a liquid drain valve 3 is connected to the other side of the heating cylinder 1 below the guide plate 10. When the preheater is used to heat the paint, the heating tube 9 is controlled to operate, transferring the heat... The heat is transferred to the heating rod 6, which then transfers heat to the paint material, enhancing the paint's fluidity. While the heating rod 6 is being heated, the temperature sensor 8 transmits the temperature parameters of the heating rod 6 back to the temperature control unit. The temperature control element in the temperature control box controls the heating tube 9 to be energized or de-energized, keeping the temperature of the heating rod 6 within the set range. Then, the paint is injected into the heating cylinder 1 through the injection valve 2. The spiral flow guide plate 10 guides the paint to flow spirally along the guide plate 10, ensuring full contact and heat conduction with the heating rod 6. The heated paint is then discharged through the drain valve 3 and supplied to the inside of the spray gun for paint spraying.

[0028] The heating cylinder 1 has a magnetic flux compression cleaning assembly surrounding the heating rod 6 inside its chamber. This assembly includes, from top to bottom, a primary electromagnet ring 14, a secondary electromagnet ring 15, a tertiary electromagnet ring 16 mounted on the inner wall of the heating cylinder 1, and a guide plate 10 fitted around the outside of the heating rod 6. The top of the guide plate 10 has a magnetically attracted ring 13 fitted onto the heating rod 6. The guide plate 10 has a spiral structure, with its inner and outer diameters respectively fitting against the heating rod 6 and the heating cylinder 1. The spiral tail plate and spiral top plate of the guide plate 10 are respectively fastened to the heating rod 6 and the heating cylinder 1 by bolts. The magnetic iron ring 13 is screwed and fixed, and the guide plate 10 is made of spring steel. During the process of using the preheater to heat the paint, the spiral structure of the guide plate 10 can play a spiral guiding role, so as to extend the heating time of the paint and the ability to achieve uniform and comprehensive heat conduction of the paint. The spring steel guide plate 10 also has good compression performance. After the paint is heated, by using the elastic compression of the guide plate 10, the paint residue inside the heating cylinder 1 can be cleaned out by compression and scraping, avoiding the situation where the residual paint coagulates and adheres, or repeatedly heats and deforms and blocks the flow cavity.

[0029] The primary electromagnet ring 14, the secondary electromagnet ring 15, and the tertiary electromagnet ring 16 are all arranged in pairs, and the magnetism of the primary electromagnet ring 14, the secondary electromagnet ring 15, and the tertiary electromagnet ring 16 increases proportionally in that order. The primary electromagnet ring 14, the secondary electromagnet ring 15, and the tertiary electromagnet ring 16 are arranged at equal intervals. According to the formula for the magnitude of the magnetic field generated by the current: B=μoI / 2πr; where B represents the strength of the magnetic field, μo represents the permeability of the vacuum, I represents the magnitude of the current, and r represents the length of the arc of the magnetic field line that has been rotated.

[0030] It can be seen that by sequentially increasing the current intensity of the first-stage electromagnet ring 14, the second-stage electromagnet ring 15, and the third-stage electromagnet ring 16, the electromagnetic strength of the first-stage electromagnet ring 14, the second-stage electromagnet ring 15, and the third-stage electromagnet ring 16 can be sequentially increased, thereby increasing the attraction strength of the magnetic ring 13. This causes the magnetic ring 13 to convert the magnetic attraction pressure into a sequentially increasing downward thrust, which pushes the spiral guide plate 10 to perform magnetic compression, cleaning and scraping the paint residue remaining inside the heating cylinder 1 after heating by compression and scraping.

[0031] The bottom of the heating rod 6 is fitted with a push rod 12 that passes through the heating tube 9. The heating tube 9 has a spiral structure. The top of the push rod 12 is equipped with a magnet post 11 that is directly opposite the secondary electromagnet ring 15 and the tertiary electromagnet ring 16. The bottom of the push rod 12 is fixedly connected to the valve core 7 in the unloading opening and closing assembly. When the primary electromagnet ring 14, the secondary electromagnet ring 15, and the tertiary electromagnet ring 16 are sequentially energized and magnetized, when the secondary electromagnet ring 15 and the tertiary electromagnet ring 16 are sequentially electromagnetically connected, the magnetic attraction generated by their magnetic flux drives the magnet post 11 to move down synchronously. At the same time as the magnet post 11 moves down, the push rod 12 moves down synchronously, overcoming the opening and closing pressure of the unloading opening and closing assembly, and pushing the valve core 7 to move down and open, so that the residual paint cleaned by compression and scraping flows into the return cylinder 4 for autonomous collection.

[0032] A discharge opening and closing assembly is installed between the mating ports of the return cylinder 4 and the heating cylinder 1. The discharge opening and closing assembly includes multiple sets of guide rods 18 arranged symmetrically in a ring on the top of the chamber of the return cylinder 4, and an opening and closing valve core 7 installed between the mating ports of the return cylinder 4 and the heating cylinder 1. Each set of guide rods 18 has a guide sleeve 19 sleeved on the outside of its arm, and the guide sleeve 19 is fixedly connected to the opening and closing valve core 7 through the arm force crossbar 17. A compression spring 20 corresponding to the guide sleeve 19 is sleeved on the outside of the arm of the guide rod 18. When the paint is discharged and collected, the bottom three-stage electromagnet ring 16 is de-energized, and the magnetic attraction force on the magnetic attraction ring 13 and the magnetic column 11 disappears. Then, the guide plate 10 elastically resets under its own elastic force, and its spiral structure resets and opens, continuing to serve as a spiral guide plate. The opening and closing valve core 7 moves upward and resets under the combined elastic force of the compression spring 20 and the guide sleeve 19, closing the discharge port.

[0033] The cavity of the reflux cylinder 4 is equipped with a scraping cleaning assembly, which includes a rotating bushing 22 installed in the upper half of the cavity of the reflux cylinder 4. A rotating ring frame 21 is engaged inside the rotating shaft of the rotating bushing 22. Two sets of cleaning scrapers 23 are symmetrically arranged below the rotating ring frame 21 and are in contact with the inner wall of the reflux cylinder 4. A bevel gear disc 26 is arranged above the rotating ring frame 21. A knob handle 24 is installed on the upper half of the cylinder body of the reflux cylinder 4, directly above the rotating ring frame 21. The output end of the knob handle 24 is equipped with a component that is connected to the bevel gear disc 26. The six-phase meshing bevel gear 25 and the return cylinder 4 are cone-shaped structures. The bottom of the return cylinder 4 is connected to the return valve 5. The returned paint is collected in the return cylinder 4. The staff can open the return valve 5 to recover the paint. Simultaneously, the knob handle 24 is turned to drive the bevel gear 25 to rotate. Through the meshing transmission between the bevel gear 25 and the bevel gear disc 26, the rotating ring frame 21 is driven to rotate along the rotating shaft sleeve 22, which drives the cleaning scraper 23 to rotate and scrape the paint on the inner wall of the return cylinder 4 to ensure the thorough cleaning of the remaining paint.

[0034] The working principle of this invention is as follows: When the preheater is used to heat the paint, the heating tube 9 is controlled to transfer heat to the heating rod 6. While the heating rod 6 is being heated, the temperature sensor 8 transmits the temperature parameters of the heating rod 6 back to the temperature control unit. The temperature control element in the temperature control box controls the heating tube 9 to be energized or de-energized, thus controlling the temperature of the heating rod 6 within the set range. Then, the paint is injected into the heating cylinder 1 through the injection valve 2. The spiral flow guide plate 10 guides the paint to flow spirally along the guide plate 10, ensuring full contact and heat conduction with the heating rod 6. The heated paint is then discharged through the drain valve 3. The paint is fed into the spray gun for spraying. After the paint is heated, the primary electromagnet ring 14, secondary electromagnet ring 15, and tertiary electromagnet ring 16 are energized sequentially. The magnitude of the energizing current increases the electromagnetic strength of each ring, thereby increasing the attraction to the magnetic ring 13. This causes the magnetic ring 13 to convert the magnetic pressure into a progressively increasing downward thrust, pushing the spiral guide plate 10 to magnetically compress the paint. This cleans and scrapes away any residual paint inside the heating cylinder 1 through compression and scraping. Furthermore, when the secondary electromagnet ring 16... When the electromagnetic flux of the 5th and 3rd stage electromagnet rings 16 is sequentially turned on, the magnetic attraction generated by their magnetic flux drives the magnet column 11 to move down synchronously. At the same time as the magnet column 11 moves down, the arm force push rod 12 moves down synchronously, overcoming the opening and closing pressure of the unloading opening and closing assembly, and pushing the opening and closing valve core 7 to move down and open, so that the residual paint cleaned by compression and scraping flows into the return cylinder 4 for autonomous collection. Furthermore, after the paint unloading and collection are completed, the bottom 3rd stage electromagnet ring 16 is de-energized, and the magnetic attraction force on the magnetic ring 13 and the magnet column 11 disappears. Then, the guide plate 10 elastically resets under its own elastic force, and its spiral structure resets and opens, continuing to act as a spiral guide. The flow plate and the valve core 7, under the combined elastic force of the compression spring 20 and the guide sleeve 19, move upward and reset to close the outlet. Subsequently, the operator can open the return valve 5 to recover the paint. Simultaneously, the knob handle 24 is rotated, which drives the bevel gear 25 to rotate. Through the meshing transmission between the bevel gear 25 and the bevel gear disc 26, the rotating ring frame 21 is driven to rotate along the rotating shaft sleeve 22, which drives the cleaning scraper 23 to rotate and scrape the paint on the inner wall of the return cylinder 4, so that the paint can be fully returned and collected. The whole machine has strong mechanical autonomy and does not require much manual operation, which can effectively ensure the high efficiency and long-term heating performance of the heater.

[0035] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A preheater based on paint viscosity reduction, characterized in that, It includes a heating cylinder (1) and a reflux cylinder (4), wherein the reflux cylinder (4) is installed below the heating cylinder (1); The heating cylinder (1) is provided with a heating rod (6) inside the cavity, and a magnetic flux compression cleaning assembly surrounding the heating rod (6) is provided inside the cavity of the heating cylinder (1). A discharge opening and closing assembly is installed between the mating ports of the reflux cylinder (4) and the heating cylinder (1), and a scraping cleaning assembly is provided inside the cavity of the reflux cylinder (4). The heating rod (6) has a heating tube (9) installed inside its body, and a temperature control sensor (8) is installed inside the heating rod (6) on the side facing the heating tube (9). The magnetic flux compression cleaning assembly includes a first-stage electromagnet ring (14), a second-stage electromagnet ring (15), a third-stage electromagnet ring (16) installed from top to bottom on the inner wall of the heating cylinder (1) and a guide plate (10) sleeved on the outside of the heating rod (6). The top of the guide plate (10) is provided with a magnetic attraction ring (13) sleeved on the heating rod (6). The guide plate (10) has a spiral structure, and the inner and outer diameters of the spiral of the guide plate (10) are respectively attached to the heating rod (6) and the heating cylinder (1). The spiral tail plate and spiral top plate of the guide plate (10) are respectively screwed and fixed to the heating rod (6) and the magnetic iron ring (13) by fastening bolts. The guide plate (10) is made of spring steel. The first-level electromagnet ring (14), the second-level electromagnet ring (15), and the third-level electromagnet ring (16) are all arranged in pairs, and the magnetism of the first-level electromagnet ring (14), the second-level electromagnet ring (15), and the third-level electromagnet ring (16) increases proportionally in sequence. The first-level electromagnet ring (14), the second-level electromagnet ring (15), and the third-level electromagnet ring (16) are arranged at equal intervals. The bottom of the heating rod (6) is fitted with an arm force push rod (12) that passes through the heating tube (9), and the heating tube (9) has a spiral structure. The top of the arm of the arm force push rod (12) is provided with a magnet column (11) that is directly opposite the secondary electromagnet ring (15) and the tertiary electromagnet ring (16), and the bottom of the arm of the arm force push rod (12) is fixedly connected to the opening and closing valve core (7) in the unloading opening and closing assembly. The unloading opening and closing assembly includes multiple sets of guide rods (18) arranged in a ring and symmetrically installed on the top of the reflux cylinder (4) chamber, and an opening and closing valve core (7) installed between the reflux cylinder (4) and the heating cylinder (1) mating port. Each set of guide rods (18) has a guide sleeve (19) sleeved on the outside of its arm, and the guide sleeve (19) is fixedly connected to the opening and closing valve core (7) through the arm force crossbar (17). The guide rod (18) has a compression spring (20) sleeved on the outside of its arm corresponding to the guide sleeve (19).

2. A preheater based on paint viscosity reduction according to claim 1, characterized in that, The heating cylinder (1) has an injection valve (2) connected to one side of the cylinder above the guide plate (10), and a drain valve (3) connected to the other side of the cylinder below the guide plate (10).

3. A preheater based on paint viscosity reduction according to claim 1, characterized in that, The scraping cleaning assembly includes a rotating bushing (22) installed in the upper half of the reflux cylinder (4) chamber. A rotating ring frame (21) is engaged inside the rotating shaft of the rotating bushing (22). Two sets of cleaning scrapers (23) are symmetrically arranged below the rotating ring frame (21) and are in contact with the inner wall of the reflux cylinder (4).

4. A preheater based on paint viscosity reduction according to claim 3, characterized in that, A bevel gear disk (26) is provided above the rotating ring frame (21), and a knob handle (24) is installed on the upper half of the reflux cylinder (4) facing the rotating ring frame (21), and a bevel gear (25) that meshes with the bevel gear disk (26) is installed at the output end of the knob handle (24).

5. A preheater based on paint viscosity reduction according to claim 1, characterized in that, The reflux cylinder (4) has a conical structure, and the bottom of the cone of the reflux cylinder (4) is connected to a reflux valve (5).

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