A paint heater for a paint production line

Abstract

The application provides a paint heater for a paint production line, and relates to the field of paint fluid heating. The paint heater for the paint production line comprises a feeding kettle body and a device host, and further comprises a self-flow heating assembly and a constant-temperature back-and-forth pump assembly. The self-flow heating assembly comprises an upper conical cover, a heating oil circulation assembly and a column shell. The upper conical cover is connected with the upper end of the column shell, and the interiors of the upper conical cover and the column shell are hollow structures. A plurality of longitudinally distributed discharge pipes are fixed in the column shell, and the outer walls of the discharge pipes are in the hollow structure of the column shell. The paint heater for the paint production line is provided with the constant-temperature back-and-forth pump assembly. The paint with greatly reduced viscosity after being heated can pass through the feeding elbow pipe, and the self-expanding corrosion-resistant capsule can expand when moving downward and contract when moving upward, so that the pump feeding is realized. Moreover, the self-expanding corrosion-resistant capsule after expansion can transfer the heat of the heating oil outward, so that the paint is prevented from being blocked due to the local temperature reduction and affecting the pump feeding.

Description

Technical Field

[0001] This invention relates to the field of coating fluid heating, specifically a coating heater for use in coating production lines. Background Technology

[0002] A paint production line is a production line used for spraying. Paint generally consists of four basic components: film-forming substances, pigments, solvents, and additives. The viscosity of paint is related to its temperature; as the temperature increases, its viscosity decreases. In the paint production process, solid particles or powdered raw materials need to be mixed and dispersed into a liquid base. The installation of heating components can reduce the viscosity of the raw materials, making them easier to flow and mix. This facilitates the uniform dispersion and mixing of the solid and liquid base materials and prevents clumping.

[0003] Especially in coating production lines, heating can accelerate dissolution and reaction: promote the dissolution of resins in solvents, or accelerate certain chemical reactions. It can also reduce viscosity, improving material flowability for easier transport, mixing, and dispersion. Furthermore, it can promote evaporation, removing moisture or small molecules in dehydrating or desolventizing coatings. Finally, it can ensure specific process temperatures, as certain chemical reactions or physical processes require specific temperatures.

[0004] Especially in the later stages of transportation, heating components are required. Existing heating methods are generally heat transfer oil heating and electric heat tracing. These two heating methods improve the flowability of the coating, which, in conjunction with the pump, enables transportation and filling. However, even low-viscosity coatings are prone to clogging of the pump and heater during transportation. In particular, traditional transfer pumps are more susceptible to damage when dealing with coatings, as coatings have high viscosity, abrasiveness, corrosiveness, and easy curing properties. This can cause significant damage to positive displacement pumps, cam pumps, and gear pumps. Furthermore, it is difficult to maintain the temperature of the heated coating when it passes through the pump. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a paint heater for a paint production line, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a paint heater for a paint production line, comprising a feeding vessel and a main equipment unit, and further comprising a self-flowing heating component and a constant temperature reciprocating pump component. The self-flowing heating component comprises an upper conical shroud, a heating oil circulation component, and a column shell. The upper conical shroud is connected to the upper end of the column shell, both of which are hollow structures. Multiple longitudinally distributed feeding pipes are fixed in the column shell, and the outer walls of the feeding pipes are located within the hollow structure of the column shell. The upper conical shroud is connected to the bottom of the feeding vessel, and the interior of the feeding pipes is connected to the inside of the feeding vessel. The heating oil circulation component allows heating oil to be injected from the bottom of the column shell, pass through the upper conical shroud, and then circulate back into the main equipment unit for reheating.

[0007] The constant temperature reciprocating pump assembly is installed at the end of the column shell away from the feeding vessel. The constant temperature reciprocating pump assembly includes a feeding bend and a self-expanding corrosion-resistant capsule. The self-expanding corrosion-resistant capsule moves up and down inside the feeding bend. When it moves down, it is filled with heating oil and expands to press down the coating inside the feeding bend. When it moves up, the heating oil flows back to the main unit of the equipment to raise the temperature. At this time, it shrinks in volume and moves up to the upper end of the feeding bend.

[0008] Preferably, the self-flowing heating assembly further includes a stirrer and an anti-clogging component. The anti-clogging component is installed in the discharge pipe and includes an inner scraper and an outer scraper. A gear is fixedly installed at the upper end of the inner scraper. Baffles for supporting the discharge pipe are fixed at both the upper and lower ends inside the cylindrical shell. The gear is located on the upper baffle and is rotatably connected to it. The outer scraper is located inside the discharge pipe, and its lower end is fixed to the lower baffle. The inner scraper is in contact with the inner wall of the discharge pipe, and the outer scraper is in contact with the side of the inner scraper away from the discharge pipe. The stirrer rotates to drive the inner scraper to rotate and clean the coating on the inner wall of the discharge pipe. At the same time, the outer scraper stirs again and cleans the coating adhering to the inner scraper.

[0009] Preferably, the inner scraper is tangent to the inner wall of the feed pipe, the width of the outer scraper is smaller than that of the inner scraper, and the tip of the outer scraper abuts against the inner scraper.

[0010] Preferably, the stirrer includes a motor, a heat-conducting drive shaft, and a cross-shaped stirring rod. The motor is sealed and fixed inside the cylindrical shell. The heat-conducting drive shaft is connected to the output shaft of the motor, and its upper end is connected to the cross-shaped stirring rod, which is located inside the upper conical cover.

[0011] Preferably, the upper conical cover is provided with a horizontal plate, which has a hollow structure and is connected to the upper conical cover. The horizontal plate is provided with a guide pipe aligned with the feed pipe. The cylindrical shell is also provided with a heat radiation mesh, which is fixed between two baffles. All feed pipes are in the heat radiation mesh.

[0012] Preferably, the heating oil circulation assembly includes an oil supply pipe, an oil return pipe, and a guide oil pipe. One end of the oil supply pipe is connected to the main unit of the equipment to transfer the heated oil. The other end of the oil supply pipe is connected to the bottom of the column shell and communicates with its interior. Multiple guide oil pipes are provided. The upper end of the guide oil pipe is connected to the upper cone cover, and the lower end of the guide oil pipes are connected to the return oil pipe. The return oil pipe is connected to the main unit of the equipment to return the cooled heating oil. All guide oil pipes are inclined.

[0013] Preferably, the constant temperature reciprocating pump assembly further includes a reciprocating telescopic rod, which has two telescopic shafts, one above the other. Hollow columns are fixedly installed at both ends of the self-expanding corrosion-resistant capsule. The hollow columns are connected to the inside of the self-expanding corrosion-resistant capsule, and a solenoid valve is installed at the connection. The telescopic shafts are fixed to one end of the hollow column that passes through the feeding bend. The hollow column is connected to the main unit of the equipment by a flexible hose for transmitting heating oil.

[0014] Preferably, the main unit of the equipment is equipped with a heating oil circulation heating component and a hydraulic component. The heating oil circulation heating component is connected to an oil supply pipe, an oil return pipe and a hose, and the hydraulic component is used to control the extension of the reciprocating telescopic rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The paint heater used in the paint production line is equipped with a constant temperature reciprocating pump assembly. The viscosity of the heated paint is greatly reduced and it passes through the feed bend. The self-expanding corrosion-resistant capsule moves downward and expands, and moves upward and contracts, thereby realizing the pumping. Moreover, the expanded self-expanding corrosion-resistant capsule can transfer the heat of the heating oil to the outside, thereby avoiding the paint from clumping due to local temperature drop and affecting the pumping.

[0017] 2. This paint heater for a paint production line, by setting up a self-flowing heating component, allows low-temperature, highly viscous paint stored in the feeding vessel to be automatically softened and flowed downwards through the feed pipe by using the fluid heating of the upper conical shroud at the bottom. The feed pipe continuously transfers heat from the heating oil, eliminating the need for additional pressurization components and preventing paint contamination. While the paint at the bottom flows by gravity, the lower-temperature paint at the top remains unaffected, enabling localized heating of the paint and avoiding high initial power consumption.

[0018] 3. The paint heater used in the paint production line is equipped with an anti-clogging component. Since the paint softens and flows when heated, the anti-clogging component can not only avoid the problem of reduced effect due to the paint blocking the heating zone, but also realize automated material unloading.

[0019] 4. The paint heater used in the paint production line is equipped with an agitator. The agitator is small in size and only acts on the paint in the heating zone. Therefore, it can both disperse the material and enhance the heating effect of the local paint. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a front view of the structure of the present invention;

[0022] Figure 3 This is a cross-sectional view of the structure of the present invention;

[0023] Figure 4 This is a partial structural diagram of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the self-flowing heating assembly of the present invention;

[0025] Figure 6 This is a cross-sectional view of the structure of the self-flowing heating assembly of the present invention;

[0026] Figure 7 This is a structural separation diagram of the self-flowing heating assembly of the present invention;

[0027] Figure 8 This is a schematic diagram of the anti-clogging component of the present invention;

[0028] Figure 9 This is a schematic diagram of the structure of the constant temperature reciprocating pump assembly of the present invention;

[0029] Figure 10 This is a cross-sectional view of the structure of the constant temperature reciprocating pump assembly of the present invention.

[0030] In the diagram: 1. Feeding vessel body; 2. Main equipment; 3. Self-flowing heating assembly; 301. Upper conical shroud; 302. Heating oil circulation assembly; 3021. Oil delivery pipe; 3022. Oil return pipe; 3023. Guide oil pipe; 303. Column shell; 304. Feeding pipe; 305. Agitator; 3051. Motor; 3052. Heat-conducting drive shaft; 3053. Cross stirring bar; 306. Anti-clogging component; 3061. Inner scraper; 3062. Outer scraper; 307. Baffle plate; 308. Horizontal plate; 309. Feeding pipe; 310. Heat radiation mesh cover; 4. Constant temperature reciprocating pump assembly; 401. Feeding bend; 402. Self-expanding corrosion-resistant capsule; 403. Reciprocating telescopic rod; 404. Hollow column. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0032] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0035] like Figure 1-10 As shown, a paint heater for a paint production line includes a feeding vessel 1 and a main equipment 2, as well as a self-flowing heating component 3 and a constant-temperature reciprocating pump component 4. The self-flowing heating component 3 includes an upper conical shroud 301, a heating oil circulation component 302, and a cylindrical shell 303. The upper conical shroud 301 is connected to the upper end of the cylindrical shell 303, and both have hollow internal structures. Multiple longitudinally distributed feed pipes 304 are fixed in the cylindrical shell 303, and the outer wall of the feed pipes 304 is located inside the hollow structure of the cylindrical shell 303. The upper conical shroud 301 is connected to the bottom of the feeding vessel 1, and the interior of the feed pipes 304 is connected to the interior of the feeding vessel 1. The heating oil circulation component 302 allows heating oil to be injected from the bottom of the cylindrical shell 303, pass through the upper conical shroud 301, and then circulate back into the main equipment 2 for reheating.

[0036] The thermostatic reciprocating pump assembly 4 is installed at the end of the column shell 303 away from the feeding vessel 1. The thermostatic reciprocating pump assembly 4 includes a feeding bend 401 and a self-expanding corrosion-resistant capsule 402. The self-expanding corrosion-resistant capsule 402 moves up and down inside the feeding bend 401. When it moves down, it is filled with heating oil and expands to press down the coating inside the feeding bend 401. When it moves up, the heating oil flows back to the main unit 2 of the equipment to raise the temperature. At this time, it shrinks in volume and moves up to the upper end of the feeding bend 401.

[0037] After reaction and melting, the coating is transferred to the feeding vessel 1, or it can be indirectly stored in the feeding vessel 1. The feeding vessel 1 is an intermediate storage component. The upper conical cover 301 is made of heat-conducting material. The coating at the bottom is in contact with the upper conical cover 301. The bottom of the upper conical cover 301 and the outside of the cylindrical shell 303 are insulated to prevent heat leakage. The discharge pipe 304 is a heat transfer component. Its inner wall is treated with an anti-stick coating. After the fluid heating oil surrounds the outer wall of the discharge pipe 304, its inner wall remains heated. The coating softened by the upper conical cover 301 will flow into the discharge pipe 304 under the influence of gravity. The fluid used to transfer heat will continuously circulate and heat in the main unit 2 of the equipment.

[0038] The self-expanding corrosion-resistant capsule 402 is made of corrosion-resistant rubber and is capsule-shaped. After being compressed and expanded, it fills the entire feeding bend 401. The fluid circulating and heating the self-expanding corrosion-resistant capsule 402 is also continuously circulated and heated in the main unit 2 of the equipment.

[0039] In an optional embodiment, the self-flowing heating assembly 3 further includes a stirrer 305 and an anti-clogging component 306. The anti-clogging component 306 is installed in the feed pipe 304 and includes an inner scraper 3061 and an outer scraper 3062. A gear is fixedly installed on the upper end of the inner scraper 3061. Baffles 307 for supporting the feed pipe 304 are fixed at both the upper and lower ends inside the cylindrical shell 303. The gear is located on the upper baffle 307 and rotates with it. The outer scraper 3062 is located inside the feed pipe 304, with its lower end fixed to the baffle plate 307 below. The inner scraper 3061 is in contact with the inner wall of the feed pipe 304, and the outer scraper 3062 is in contact with the side of the inner scraper 3061 away from the feed pipe 304. The agitator 305 rotates to drive the inner scraper 3061 to rotate and clean the paint on the inner wall of the feed pipe 304. At the same time, the outer scraper 3062 agitates again and cleans the paint adhering to the inner scraper 3061.

[0040] In this embodiment, the output shaft of the agitator 305 is also provided with a central gear, which meshes with all the gears on the outer ring. A bearing is provided at the connection between the gear and the partition plate 307, and the bearing is embedded in the partition plate 307. The inner scraper 3061 is fixed in the inner ring of the gear. When the outer scraper 3062 is connected to the bottom of the partition plate 307, it does not affect the feeding of the feed pipe 304.

[0041] In an optional embodiment, the inner scraper 3061 is tangent to the inner wall of the feed pipe 304, the width of the outer scraper 3062 is smaller than that of the inner scraper 3061, and the tip of the outer scraper 3062 abuts against the inner scraper 3061.

[0042] In this embodiment, both the inner scraper 3061 and the outer scraper 3062 are arc-shaped plates. The curvature of the inner scraper 3061 is the same as that of the feed pipe 304. One end of the outer scraper 3062 is a pointed structure, and the outer scraper 3062 is inclined.

[0043] In an optional embodiment, the stirrer 305 includes a motor 3051, a heat-conducting drive shaft 3052, and a cross-shaped stirring rod 3053. The motor 3051 is sealed and fixed inside the cylindrical shell 303. The heat-conducting drive shaft 3052 is connected to the output shaft of the motor 3051, and its upper end is connected to the cross-shaped stirring rod 3053. The cross-shaped stirring rod 3053 is located inside the upper conical cover 301.

[0044] In this embodiment, the central gear is connected to the heat-conducting drive shaft 3052, which is made of copper alloy. Since its bottom is immersed in heating oil, it can transfer some of the heat from the heating oil. The motor 3051 is externally insulated and sealed. To prevent the motor 3051 from overheating, a liquid cooling element can also be installed in the motor 3051. The water cooling pipe of the liquid cooling element can be connected to the main unit 2 of the device. A heat sink is installed in the main unit 2 of the device to enable the motor 3051 to run continuously.

[0045] In an optional embodiment, a horizontal plate 308 is provided inside the upper conical cover 301. The horizontal plate 308 has a hollow structure and is connected to the upper conical cover 301. A guide pipe 309 aligned with the feed pipe 304 is provided on the horizontal plate 308. A heat radiation mesh 310 is also provided inside the cylindrical shell 303 and fixed between two baffle plates 307. All feed pipes 304 are located in the heat radiation mesh 310.

[0046] In this embodiment, the horizontal plate 308 and the upper conical cover 301 are in direct contact with the coating at the bottom. Therefore, both the horizontal plate and the upper conical cover 301 are the main components for dissipating heat. The heat radiation mesh cover 310 allows the heating oil to pass through and store heat in the feed pipe 304.

[0047] In an optional embodiment, the heating oil circulation assembly 302 includes an oil delivery pipe 3021, an oil return pipe 3022, and a guide oil pipe 3023. One end of the oil delivery pipe 3021 is connected to the main unit 2 of the equipment and is used to transfer the heated oil. The other end of the oil delivery pipe 3021 is connected to the bottom of the cylindrical shell 303 and communicates with its interior. Multiple guide oil pipes 3023 are provided. The upper end of the guide oil pipe 3023 is connected to the upper cone cover 301, and the lower end of the guide oil pipe 3023 is connected to the oil return pipe 3022. The oil return pipe 3022 is connected to the main unit 2 of the equipment and is used to return the cooled heating oil. All guide oil pipes 3023 are inclined.

[0048] In this embodiment, the circulation of the oil supply pipe 3021 and the oil return pipe 3022 can ensure that the upper cone cover 301, the horizontal plate 308 and the column shell 303 are filled with heating oil. The guide oil pipe 3023 is used for oil return, which can ensure that the upper cone cover 301 is filled with heating oil and avoid local fluctuations in the temperature of the heating oil.

[0049] In an optional embodiment, the constant temperature reciprocating pump assembly 4 further includes a reciprocating telescopic rod 403, which has two telescopic shafts, one above the other. Hollow columns 404 are fixedly installed at both ends of the self-expanding corrosion-resistant capsule 402. The hollow columns 404 are internally connected to the self-expanding corrosion-resistant capsule 402, and a solenoid valve is installed at the connection. The telescopic shafts and one end of the hollow column 404 are fixed through the feeding bend 401. The hollow column 404 is connected to the main unit 2 of the equipment by a hose for transmitting heating oil.

[0050] In this embodiment, the reciprocating telescopic rod 403 is a bidirectional hydraulic rod. Under the control of hydraulic pressure, the telescopic shaft can move back and forth. The hollow column 404 is a metal rod that can transmit the force that pulls the self-expanding corrosion-resistant capsule 402 and can also be used to transmit heating oil.

[0051] In an optional embodiment, the main unit 2 is equipped with a heating oil circulation heating component and a hydraulic assembly. The heating oil circulation heating component is connected to an oil supply pipe 3021, an oil return pipe 3022 and a hose. The hydraulic assembly is used to control the extension of the reciprocating telescopic rod 403.

[0052] In this embodiment, the heating oil circulation heating component includes an oil tank, an electric heater, a temperature control sensor, and an electrical system, while the hydraulic component also includes a hydraulic pump and an oil tank. In addition, the main unit 2 of the equipment is also equipped with circuit modules for the operation of the entire system and various controllers, sensors, operation panels, etc.

[0053] During use, low-temperature, high-viscosity coatings are stored in the feeding vessel 1, or the mixed viscous coatings are transferred to the feeding vessel 1 for storage using a conveying component. During heating and feeding, the main control unit 2 transfers pre-heated oil to the oil delivery pipe 3021. The heated oil enters the column shell 303, where it transfers heat to the lower feed pipe 304 via the heat radiation mesh 310. The heated oil in the column shell 303 rises and fills the upper conical shroud 301 before returning to the main control unit 2 via the guide oil pipe 3023 and return oil pipe 3022 for reheating. The hot oil disperses as it passes through the guide oil pipe 3023, completely filling the upper conical shroud 301 and the horizontal plate 308, and contacting the upper conical shroud 301 and the horizontal plate 308. The coating on plate 308 will slowly heat up and reduce its viscosity, and then flow into the feed pipe 304. Since the feed pipe 304 has already transferred heat, the coating will slowly flow out of the feed pipe 304. During the flow, the motor 3051 will drive the cross-shaped stirring bar 3053 to slowly stir the coating heated at the bottom. Since one end of the heat-conducting drive shaft 3052 is also immersed in the heated oil, the viscosity of all the coating on the heat-conducting drive shaft 3052 will also decrease. When the heat-conducting drive shaft 3052 rotates, all the inner scrapers 3061 in the feed pipe 304 will rotate relative to the outer scrapers 3062. During this process, the coating adhering to the inner wall of the feed pipe 304 will be scraped off, and the coating can be continuously transported with virtually no probability of blockage.

[0054] The viscosity of the heated coating has decreased significantly. It passes through the feeding bend 401, while the self-expanding corrosion-resistant capsule 402 moves continuously up and down under the action of the reciprocating telescopic rod 403. When moving down, the main unit 2 supplies heating oil to the self-expanding corrosion-resistant capsule 402 through the hose. The self-expanding corrosion-resistant capsule 402 will expand. After expansion, it can push the coating downward. When moving up, the upper hose begins to draw out the heating oil inside the self-expanding corrosion-resistant capsule 402, while the bottom hose remains closed. At this time, the self-expanding corrosion-resistant capsule 402 will contract, which does not affect the flow of the coating. Thus, the pumping is achieved by moving up and down. Moreover, the expanded self-expanding corrosion-resistant capsule 402 can transfer the heat of the heating oil to the outside, and the coating that has been fed can maintain its temperature.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0056] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A paint heater for a paint production line, comprising a feeding vessel (1) and a main unit (2), characterized in that: It also includes a self-flowing heating component (3) and a constant temperature reciprocating pump component (4). The self-flowing heating component (3) includes an upper cone shroud (301), a heating oil circulation component (302), and a cylindrical shell (303). The upper cone shroud (301) is connected to the upper end of the cylindrical shell (303). Both of them have hollow internal structures. Multiple longitudinally distributed feed pipes (304) are fixed in the cylindrical shell (303). The outer wall of the feed pipe (304) is located inside the hollow structure of the cylindrical shell (303). The upper cone shroud (301) is connected to the bottom of the feeding vessel (1). The inside of the feed pipe (304) is connected to the inside of the feeding vessel (1). The heating oil circulation component (302) allows the heating oil to be injected from the bottom of the cylindrical shell (303), pass through the upper cone shroud (301), and then circulate back into the main unit of the equipment (2) to be heated again. The constant temperature reciprocating pump assembly (4) is installed at the end of the column shell (303) away from the feeding vessel body (1). The constant temperature reciprocating pump assembly (4) includes a feeding bend (401) and a self-expanding corrosion-resistant capsule (402). The self-expanding corrosion-resistant capsule (402) moves up and down inside the feeding bend (401). When it moves down, the inside is filled with heating oil and expands to press down the coating inside the feeding bend (401). When it moves up, the heating oil flows back to the main unit (2) of the equipment to raise the temperature. At this time, the volume is reduced and it moves up to the upper end of the feeding bend (401).

2. The paint heater for a paint production line according to claim 1, characterized in that: The self-flowing heating assembly (3) also includes a stirrer (305) and an anti-blocking component (306). The anti-blocking component (306) is installed in the feed pipe (304). The anti-blocking component (306) includes an inner scraper (3061) and an outer scraper (3062). A gear is fixedly installed on the upper end of the inner scraper (3061). Both the upper and lower ends of the cylindrical shell (303) are fixed with baffles (307) for supporting the feed pipe (304). The gear is located on the upper baffle (307) and rotatably connected to it. The scraper (3062) is located inside the feed pipe (304), and its lower end is fixed to the baffle plate (307) below. The inner scraper (3061) is in contact with the inner wall of the feed pipe (304), and the outer scraper (3062) is in contact with the side of the inner scraper (3061) away from the feed pipe (304). The agitator (305) rotates to drive the inner scraper (3061) to rotate and clean the paint on the inner wall of the feed pipe (304). At the same time, the outer scraper (3062) stirs again and cleans the paint adhering to the inner scraper (3061).

3. The paint heater for a paint production line according to claim 2, characterized in that: The inner scraper (3061) is tangent to the inner wall of the feed pipe (304), the width of the outer scraper (3062) is smaller than that of the inner scraper (3061), and the tip of the outer scraper (3062) abuts against the inner scraper (3061).

4. The paint heater for a paint production line according to claim 3, characterized in that: The stirrer (305) includes a motor (3051), a heat-conducting drive shaft (3052), and a cross-shaped stirring rod (3053). The motor (3051) is sealed and fixed inside the cylindrical shell (303). The heat-conducting drive shaft (3052) is connected to the output shaft of the motor (3051), and its upper end is connected to the cross-shaped stirring rod (3053). The cross-shaped stirring rod (3053) is located inside the upper conical cover (301).

5. The paint heater for a paint production line according to claim 4, characterized in that: The upper cone cover (301) is provided with a horizontal plate (308), which has a hollow structure and is connected to the upper cone cover (301). The horizontal plate (308) is provided with a guide pipe (309) aligned with the feed pipe (304). The cylindrical shell (303) is also provided with a heat radiation mesh cover (310), which is fixed between two baffles (307). All feed pipes (304) are in the heat radiation mesh cover (310).

6. The paint heater for a paint production line according to claim 5, characterized in that: The heating oil circulation assembly (302) includes an oil delivery pipe (3021), an oil return pipe (3022), and a guide pipe (3023). One end of the oil delivery pipe (3021) is connected to the main unit of the equipment (2) to deliver the heating oil that is heated. The other end of the oil delivery pipe (3021) is connected to the bottom of the cylindrical shell (303) and communicates with its interior. There are multiple guide pipes (3023). The upper end of the guide pipe (3023) is connected to the upper cone cover (301), and the lower end of the guide pipe (3023) is connected to the oil return pipe (3022). The oil return pipe (3022) is connected to the main unit of the equipment (2) to return the heating oil that is cooled. All the guide pipes (3023) are inclined.

7. The paint heater for a paint production line according to claim 6, characterized in that: The constant temperature reciprocating pump assembly (4) also includes a reciprocating telescopic rod (403). The reciprocating telescopic rod (403) is provided with two telescopic shafts, and hollow columns (404) are fixedly installed at both ends of the self-expanding corrosion-resistant capsule (402). The hollow column (404) is connected to the self-expanding corrosion-resistant capsule (402), and a solenoid valve is installed at the connection. The telescopic shaft and the end of the hollow column (404) passing through the feeding bend (401) are fixed. The hollow column (404) is connected to the main unit of the equipment (2) by a hose to transmit heating oil.

8. The paint heater for a paint production line according to any one of claims 1-7, characterized in that: The main unit (2) of the equipment is equipped with a heating oil circulation heating component and a hydraulic component. The heating oil circulation heating component is connected to the oil supply pipe (3021), the oil return pipe (3022) and the hose. The hydraulic component is used to control the extension of the reciprocating telescopic rod (403).

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