Spraying device for spraying inner container of water heater and inner container spraying method

Abstract

The invention provides a water heater inner container spraying device which comprises a spraying line platform body and a spraying mechanism arranged on the spraying line platform, and the spraying mechanism comprises a first spraying assembly, a second spraying assembly, a clamping assembly and a driving moving assembly. The first spraying assembly and the second spraying assembly are oppositely arranged on the two sides of the spraying line platform, and the clamping assembly is used for clamping and fixing a workpiece to be sprayed; according to the spraying device for the inner container of the water heater, when the inner container of the water heater is sprayed, the first spraying assembly can spray a workpiece to be sprayed on a first azimuth plane, the second spraying assembly can spray the workpiece to be sprayed on a second azimuth plane, and the powdering rate and the coating thickness of spraying are guaranteed; the spraying comprehensiveness of the inner-container-shaped workpiece is guaranteed, powder accumulation of a water inlet connector and a water outlet connector is avoided, and the spraying efficiency of the inner-container-shaped container is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment used for surface treatment in industrial production, and in particular to a water heater inner tank spraying device and an inner tank spraying method. Background Art

[0002] As we all know, in the field of modern industrial production technology, the application of automated production in various production processes has become more and more extensive. In the field of surface treatment technology, the application of electrostatic spraying equipment technology has also become more and more extensive. For example, in the surface treatment technology of workpieces of various shapes, the technical requirements of electrostatic spraying equipment similar to the inner tank of a water heater are also getting higher and higher. Because the structure of the inner tank of a water heater is different from that of a container of general shape, when the inner tank-shaped container body is used to hold aqueous solutions or other liquids, the internal coating thickness is generally required to reach 300 microns. If the coating is too thin, leakage or corrosion may occur easily. At the same time, if the spraying surface of various interfaces on the inner tank does not reach the standard coating thickness or the integral is too much, leakage may occur at the interface, or corrosion may occur, affecting the water flow, which in turn may affect the subsequent capacity and service life. In the existing spraying technology, conventional It is difficult for spraying equipment to achieve the requirement of coating thickness greater than 300 microns in one go. Therefore, it is necessary to use the positive and negative poles of the electrostatic powder spraying equipment to complete the secondary spraying process. The coating thickness of the electrostatic spraying equipment is about more than 100 microns and less than 200 microns. At the same time, when spraying on the inner cavity surface of the water heater tank, the electric field generated after the spray gun equipment is extended into the inner cavity will be completely shielded, and the static voltage on the spray gun will be protected by the spray gun itself. At the same time, the voltage generated will be reduced, and the discharge ability of the spray gun will be weakened, affecting the charging of the powder, which will increase the difficulty of powder coating on the inner cavity surface during powder spraying. Therefore, a spraying production line suitable for the inner tank-shaped container of the water heater is needed to provide a constant pressure spraying voltage mode, ensure the powder coating rate and coating thickness, ensure the comprehensiveness of the workpiece spraying, avoid powder accumulation at the inlet and outlet water interfaces, and improve the spraying efficiency of the inner tank-shaped container. Summary of the invention

[0003] Based on this, it is necessary for the present invention to provide a spraying device for spraying the inner tank of a water heater, which can ensure the spraying thickness of the inner tank-shaped container, improve the powder application rate, and avoid powder accumulation at the interface of the inner tank-shaped container.

[0004] The present invention provides a spraying device for spraying the inner tank of a water heater, comprising a spraying line platform body and a spraying mechanism arranged on the spraying line platform, the spraying mechanism comprising a first spraying component, a second spraying component, a clamping component and a driving and moving component, the first spraying component and the second spraying component are relatively arranged on both sides of the spraying line platform, the clamping component is used to clamp and fix the workpiece to be sprayed, the driving and moving component is used to drive the workpiece to be sprayed to move at a uniform speed on the spraying line platform, the clamping component is arranged above the spraying line platform, the spraying mechanism also includes a constant voltage spraying power supply component, the constant voltage spraying power supply component is electrically connected to the first spraying component and the second spraying component, and is used to provide a constant voltage spraying voltage to the first spraying component and the second spraying component, the first spraying component is used to spray a first azimuth surface of the workpiece to be sprayed, and the second spraying component is used to spray a second azimuth surface of the workpiece to be sprayed.

[0005] Preferably, the first spraying assembly includes a reciprocating machine and a spray gun component, the spray gun component is slidably connected to the reciprocating machine through a sliding seat, the spray gun component includes a spray gun unit, the spray gun unit is provided with a first spray gun unit and a second spray gun unit, the first spray gun unit and the second spray gun unit are spaced apart, the sliding seat is provided with a sliding bottom plate and a connecting rod, the connecting rod is provided with a connecting long rod body and a transfer rod, the connecting long rod body is rotatably connected to the transfer rod, the spray gun unit is rotatably connected to the connecting rod through a spray gun connecting assembly, the spray gun connecting assembly includes a short rod connecting body and a connecting seat, one end of the short rod connecting body is connected to the spray gun unit, and the other end of the short rod connecting body is rotatably connected to the connecting seat.

[0006] Preferably, the second spray assembly includes a spray gun connecting seat and a spray gun mechanism, the spray gun mechanism is rotatably connected to the spray gun connecting seat, the spray gun connecting seat is slidably connected to the spray reciprocating machine, the spray gun connecting seat includes a sliding base and a spray connecting rod assembly, the spray connecting rod assembly is detachably connected to the sliding base, the second spray assembly is used to spray the connecting port on the workpiece to be sprayed, the spray gun mechanism includes a straight-line nozzle, and the straight-line nozzle is detachably connected to the spray gun mechanism.

[0007] Preferably, the spray connecting rod assembly is provided with a connecting rod body and a rod connecting seat block, and two rod connecting seat blocks are provided. Both ends of the connecting rod body are connected to the sliding base through the rod connecting seat blocks, and the rod connecting seat blocks are rotatably connected to the connecting rod body.

[0008] Preferably, the rod body connecting seat block has the same structure as the connecting seat, and the rod body connecting seat block is provided with an upper connecting seat block and a base connecting block, the upper connecting seat block is rotatably connected to the base connecting block, and the upper connecting seat block is provided with a connecting channel for connecting the connecting rod body, and part of the connecting rod body is fixedly connected to the connecting channel.

[0009] Preferably, the constant-voltage spraying power supply assembly comprises a constant-voltage power supply box, and the constant-voltage power supply box is arranged on the spraying line platform body.

[0010] Preferably, the driving moving assembly is provided with an inverted hanging part, a movable connecting seat and a power driving part, the inverted hanging part is used to hang the workpiece to be sprayed, the movable connecting seat is connected to the inverted hanging part, the power driving part is transmission connected to the movable connecting seat, and the power driving part is a stepping motor driving part.

[0011] Preferably, the clamping assembly includes a clamping connecting seat and a clamping unit arranged on the clamping connecting seat, the clamping unit includes a first clamping unit and a second clamping unit, the first clamping unit is used to clamp the workpiece to be sprayed in a first azimuth plane, and the second clamping unit is used to clamp the workpiece to be sprayed in a second azimuth plane, the clamping unit is provided with a clamping column and a clamping wheel, the clamping wheel is fixedly connected to the clamping column, the clamping column is rotatably connected to the clamping connecting seat, the clamping unit is provided with more than two groups of clamping columns and clamping wheels, the two clamping columns are rotatably connected to the clamping connecting seat at an angle, the first clamping unit and the second clamping unit will form a circular clamping space for clamping the workpiece to be sprayed in front and back azimuth planes, the first clamping unit is provided with a plurality of groups, the second clamping unit is provided with a plurality of groups, each of the first clamping units is arranged at intervals, and each of the clamping units is arranged at intervals.

[0012] Preferably, the spray line platform body includes a base platform, a spray gate house, and a connecting seat arranged near the spray gate house, the spray gate house and the connecting seat platform are both arranged at intervals on the base platform, the driving moving component is arranged at the top position of the spray gate house, and also includes a powder recovery mechanism, the powder recovery mechanism is arranged at a side position of the spray gate house, the powder recovery mechanism includes a negative pressure chamber and a filter chamber, a filter assembly is arranged in the filter chamber, an air inlet is also opened on the filter chamber, an air outlet is also opened on the negative pressure chamber, the filter chamber is connected with the negative pressure chamber, the negative pressure chamber is used to suck the waste gas containing powder from the air inlet, the filter assembly is used to intercept the powder in the passing waste gas in the filter chamber, the air outlet is used to discharge the filtered waste gas, and the filter chamber is movably connected with the negative pressure chamber.

[0013] Preferably, the present invention further provides a spraying method for a water heater inner tank, comprising a controller, a spraying device, a film thickness detection instrument and an automatic transport device, wherein the controller is connected to the spraying device, the film thickness detection instrument and the automatic transport device, and the automatic transport device comprises a manipulator, and is characterized in that the method specifically comprises the following steps:

[0014] S1. Move multiple groups of water heater inner tank workpieces to be sprayed onto the spraying device by a manipulator;

[0015] S2, starting the clamping device in the spraying device to clamp the workpiece to be sprayed entering the spraying room of the spraying device;

[0016] S3, start the constant voltage electrostatic spray gun in the spraying device, lock the set working voltage value, and maintain a stable electrostatic output without being affected by the environment, open the spray gun parts to perform positive and negative electrode spraying once or twice in sequence, and after the spraying is completed, check whether the film thickness of the connection port on the sprayed workpiece meets the spraying thickness standard;

[0017] S4, move the qualified workpieces to the next process, re-spray the unqualified workpieces, and then conduct a second inspection, and move the qualified workpieces to the next process. During spraying, the powder recovery mechanism in the spraying device is simultaneously turned on to recover the powder in the powder spraying room;

[0018] S5, cycle operation, after the previous set of water heater inner tank workpieces are sprayed, the next set of water heater inner tank workpieces are sprayed;

[0019] The spraying device is any one of the spraying devices described above for the inner tank of a water heater.

[0020] The beneficial effects of the present invention are as follows: the present invention provides a spraying device for spraying the inner tank of a water heater, a spraying line platform body and a spraying mechanism are provided, the spraying mechanism comprises a first spraying component, a second spraying component, a clamping component and a driving and moving component, the clamping component is used to clamp and fix the workpiece to be sprayed, the driving and moving component is used to drive the workpiece to be sprayed to move at a uniform speed on the spraying line platform, the clamping component is arranged above the spraying line platform, the spraying mechanism also comprises a constant voltage spraying power supply component, the constant voltage spraying power supply component is electrically connected to the first spraying component and the second spraying component, and is used to provide a constant voltage spraying voltage to the first spraying component and the second spraying component, the first spraying component is used to spray the first azimuth surface of the workpiece to be sprayed, and the second spraying component is used to spray the second azimuth surface of the workpiece to be sprayed, so as to ensure the powder application rate and coating thickness of the spraying, ensure the comprehensiveness of the spraying of the inner tank-shaped workpiece, avoid powder accumulation at the inlet and outlet water interfaces, and improve the spraying efficiency of the inner tank-shaped container. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other purposes, features and advantages of the present invention will become more clear by more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals indicate the same parts in all the accompanying drawings, and the accompanying drawings are not deliberately scaled to the actual size, and the focus is on illustrating the main purpose of the present invention.

[0022] Figure 1 A schematic diagram of a preferred embodiment of the present invention;

[0023] Figure 2 It is a schematic plan view of a spraying device for a water heater inner tank of the present invention;

[0024] Figure 3 It is a schematic diagram of a spraying mechanism in a spraying device for a water heater tank of the present invention;

[0025] Figure 4 for Figure 3 A magnified schematic diagram of part A;

[0026] Figure 5 for Figure 3 A magnified schematic diagram of part B;

[0027] Figure 6 A schematic diagram of an embodiment of the invention providing a spraying device for the inner tank of a water heater.

[0028] In the figure: 1. first spraying assembly; 2. second spraying assembly; 21. spray gun connecting seat; 211. sliding base; 22. connecting rod body; 23. rod body connecting seat block; 3. clamping assembly; 31. first clamping unit; 32. first clamping unit; 33. clamping column; 4. reciprocating machine; 41. sliding seat; 42. sliding bottom plate; 43. connecting long rod body; 44. adapter rod; 51. first spray gun unit; 52. first spray gun unit; 6. short rod connecting body; 7. connecting seat; 8. water inlet and outlet; 9. straight nozzle; 11. constant voltage power supply box; 12. inverted hanging piece; 13. mobile connecting seat; 14. base platform; 15. spraying concierge; 16. connecting seat platform; 17. powder recovery mechanism. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0030] like Figure 1-6As shown, an embodiment of the present invention provides a spraying device for a water heater inner tank, including a spraying line platform body and a spraying mechanism arranged on the spraying line platform, the spraying mechanism includes a first spraying component 1, a second spraying component 2, a clamping component 3 and a driving and moving component, the first spraying component 1 and the second spraying component 2 are relatively arranged on both sides of the spraying line platform, the clamping component 3 is used to clamp and fix the workpiece to be sprayed, the driving and moving component is used to drive the workpiece to be sprayed to move at a uniform speed on the spraying line platform, the clamping component 3 is arranged above the spraying line platform, the spraying mechanism also includes a constant pressure spraying power supply component, the constant pressure spraying power supply component is electrically connected to the first spraying component 1 and the second spraying component 2, and is used to provide a constant pressure spray to the first spraying component and the second spraying component. Coating voltage, in the process of powder electrostatic spraying, the electrostatic coating mode is adopted. During the spraying process, when the first spray component 1 is inserted into the inner tank of the water heater to spray the inner wall, the first spray component 2 is used to spray the first surface of the workpiece to be sprayed, that is, when spraying the inside of the inner tank of the water heater, the opening on the inner tank structure is relatively small, and the entrance of the spray gun component that can be inserted is also relatively small. After the workpiece is inserted into the inner tank, the second spray component 2 is used to spray the second surface of the workpiece to be sprayed, that is, spraying the water inlet and outlet of the water heater inner tank. When the two groups of spray components are performing spraying work, the structural features of the inner tank-shaped workpiece are comprehensively sprayed in a targeted manner, which ensures the powder coating rate while also improving the spraying efficiency.

[0031] refer to Figure 1-6 As shown, in a further preferred embodiment, the first spraying assembly 1 includes a reciprocating machine 4 and a spray gun part, the spray gun part is slidably connected to the reciprocating machine through a sliding seat 41, the spray gun part includes a spray gun unit, and the spray gun unit is provided with a first spray gun unit 51 and a second spray gun unit 52. Specifically, in this embodiment, on the inner tank spraying production line, usually two or more water heater inner tank workpieces are sprayed as a group, and the entire production line can arrange at least twelve inner tank workpieces for spraying at the same time. The first spray gun unit 51 and the second spray gun unit 52 are arranged at intervals, and the sliding seat 41 is provided with a sliding bottom plate 42 and a connecting rod, connecting The rod member is provided with a connecting long rod body 43 and a transfer rod 44, the connecting long rod body 43 is rotatably connected to the transfer rod 44, the spray gun unit is rotatably connected to the connecting rod member through a spray gun connecting assembly, the spray gun connecting assembly includes a short rod connecting body 6 and a connecting seat 7, one end of the short rod connecting body 6 is connected to the spray gun unit, and the other end of the short rod connecting body 6 is rotatably connected to the connecting seat 7, and the connection between the spray gun unit and the short rod connecting body 6 and the connecting seat 7 is set as a rotatable connection, which can increase the flexibility of the spray gun unit during spraying, such as extension and adjustment of the spraying direction, to ensure the comprehensiveness of the spraying surface, and lay a good foundation for improving the spraying powder coating rate of the inner tank wall.

[0032] refer to Figure 1-6As shown, in a further preferred embodiment, the second spraying assembly 2 includes a spray gun connecting seat 21 and a spray gun mechanism, the spray gun mechanism is rotatably connected to the spray gun connecting seat 21, the spray gun connecting seat 21 is slidably connected to the spray reciprocating machine, the spray gun connecting seat 21 includes a sliding base 211 and a spray connecting rod assembly, and the spray connecting rod assembly is detachably connected to the sliding base 211. The second spraying assembly 2 is used to spray the connecting port on the workpiece to be sprayed, that is, spraying the water inlet and outlet 8 on the inner tank of the water heater. The powdering difficulty at the water inlet and outlet 8 is large. As shown in the schematic diagram, it can be seen that the water inlet and outlet 8 on the inner tank of the water heater has a spraying surface with continuous turns or corners, and there will be a drop in the spraying surface. It is difficult to spray the spraying surface in the subtle part, which also leads to the difficulty of powdering the water inlet and outlet 8 as a whole. If the powder coating rate of the water inlet and outlet 8 is low, after a period of use, the connection between the water inlet and outlet 8 and the metal connecting pipe or valve will have different degrees of corrosion or gaps. The spray gun mechanism includes a straight nozzle 9, and the horizontal lines of the straight openings on both sides of the straight nozzle are tilted downward. The straight nozzle 9 is detachably connected to the spray gun mechanism. After the powder is sprayed out from the straight nozzle 9, a fan-shaped spraying surface extending and spreading on both sides is formed, which can be swept to the corner surfaces of the continuous turns or corners on the water inlet and outlet that are difficult to spray, ensuring that the spraying surfaces of these continuous turns or curved surfaces are sprayed more evenly, and preventing the appearance of a small gap in the connection port after the valve is connected. In a specific embodiment, in order to meet the needs of different spraying surfaces, a divergent nozzle can also be replaced;

[0033] In addition, a super corona ring is also provided on the spray gun mechanism. When electrostatic spraying is performed, the super corona ring provided on the spray gun mechanism can release excess free charge on the nozzle during the spraying process to prevent overcharging, thereby achieving a better powder coating effect. The super corona ring is an existing prior art and will not be illustrated in detail in this embodiment.

[0034] refer to Figure 1-6 As shown, in a preferred embodiment, the spray connecting rod assembly is provided with a connecting rod body 22 and a rod body connecting seat block 23. Two rod body connecting seat blocks 23 are provided, and more than two rod body connecting seat blocks can also be provided. The arrangement is flexibly performed according to the number of groups of spray gun mechanisms that need to be connected. Both ends of the connecting rod body 22 are connected to the sliding base through the rod body connecting seat 23. The rod body connecting seat block is rotatably connected to the connecting rod body. The arranged connection structure is flexible, ensuring a wider spraying surface during spraying and ensuring that the spray layer at the inlet and outlet meets the standards.

[0035] refer to Figure 1-6As shown, in a further preferred embodiment, the rod body connecting seat block 23 has the same structure as the connecting seat 7, and the rod body connecting seat block 23 is provided with an upper connecting seat block and a base connecting block, the upper connecting seat block is rotatably connected to the base connecting block, and the upper connecting seat block is provided with a connecting channel for connecting the connecting rod body, and part of the connecting rod body is fixedly connected to the connecting channel.

[0036] refer to Figure 1-6 As shown, in a further preferred embodiment, the constant voltage spraying power supply assembly includes a constant voltage power supply box 11, which is arranged on the spraying line platform body, and an adjustable power supply voltage is arranged in the constant voltage power supply box 11, which is an adjustable high-voltage DC power supply for electrostatic spraying, including a primary DC input module, a transformer primary inverter structure module, a high-frequency transformer module, a secondary voltage doubler rectifier structure module and a control module;

[0037] The primary DC input module is used for the primary DC voltage input, which is generated by the DC / DC converter and the AC / DC converter; the transformer primary inverter structure module, the drain of the switch tube Q1 is connected to the positive end of the input side, the source of the switch tube Q1 is connected to the drain of the switch tube Q2, and the source of the switch tube Q2 is connected to the secondary end of the input side; the high-frequency transformer module is used to convert the low-amplitude AC voltage into a high-amplitude secondary rectification structure input voltage. The transformer converts the low-amplitude AC voltage into a high-amplitude secondary rectification structure input voltage. At the same time, the secondary side of the transformer does not need a center tap structure, which simplifies the volume of the secondary side structure; the secondary side voltage doubling rectifier structure module is used to boost the voltage passed through the high-frequency transformer module to a higher-amplitude sinusoidal voltage and pass it through the voltage doubling rectifier circuit The required high-voltage DC power output is obtained to supply power to the load. The secondary voltage doubler rectifier structure module is composed of a 12-level CW voltage doubler rectifier circuit, multiple diodes and multiple capacitors. The control module is used to ensure the constant voltage output and controllability of the high-voltage DC power supply. The closed-loop control is performed by collecting the inverter output voltage and current. The adjustable high-voltage DC power supply is used to protect the current. The power supply is stable and controllable, ensuring the voltage stability during spraying of the water heater tank. When a specific embodiment is obtained, an adjustable voltage of 60-70KV is further guaranteed to ensure the powder coating rate and thickness during spraying, and the coating thickness required for spraying the water heater tank is obtained. The adjustable high-voltage DC power supply is an existing invention that has been disclosed by the company and will not be described in detail in the drawings in this embodiment.

[0038] refer to Figure 1-6As shown, in a preferred embodiment, the driving moving assembly is provided with an inverted hanging part 12, a movable connecting seat 13 and a power driving part. The inverted hanging part 12 is used to hang the workpiece to be sprayed, the movable connecting seat 13 is connected to the inverted hanging part, and the power driving part is transmission-connected to the movable connecting seat 13. The power driving part is a stepping motor driving part. The power driving part can be arranged on the spraying line platform, above the spraying gatehouse. The transmission connection between the power output end of the motor driving part and the movable connecting seat is a common spraying mobile production line structure, which is the prior art. Of course, in other embodiments, the connection method of the power driving part and the movable connecting seat can also have other connection methods. Then the set stepping motor driving part can drive the movable connecting seat forward slowly or at a uniform speed according to the timeliness and powdering effect during electrostatic spraying to ensure the spraying effect.

[0039] refer to Figure 1-6 As shown, in a preferred embodiment, the clamping assembly 3 includes a clamping connection seat and a clamping unit arranged on the clamping connection seat, the clamping unit includes a first clamping unit 31 and a second clamping unit 32, the first clamping unit 31 is used to clamp the workpiece to be sprayed in a first azimuth plane, and the second clamping unit 32 is used to clamp the workpiece to be sprayed in a second azimuth plane, the clamping unit is provided with a clamping column 33 and a clamping wheel 34, the clamping wheel 34 is fixedly connected to the clamping column 33, the clamping column 33 is rotatably connected to the clamping connection seat, the clamping unit is provided with more than two groups of clamping columns and clamping wheels, and the two clamping columns are at an angle of The first clamping unit 31 and the second clamping unit 32 are rotatably connected to the clamping connection seat, and the first clamping unit 31 and the second clamping unit 32 will form a circular clamping space for clamping the front and rear azimuth surfaces of the workpiece to be sprayed. The first clamping unit 31 is provided with a plurality of groups, and the second clamping unit 32 is provided with a plurality of groups. Each first clamping unit is arranged at intervals, and each clamping unit is arranged at intervals. The two clamping units are arranged as a manual clamping structure. When the inner tank is sprayed, the inner tank of the water heater to be sprayed can be transported to the clamping assembly by the fifth-axis robot arm, and then the clamping wheel can be tightened manually. In order to improve the spraying efficiency, it can also be arranged as an automatic clamping structure.

[0040] refer to Figure 1-6As shown, in a further preferred embodiment, the spray line platform body includes a base platform 14, a spray gatehouse 15, and a connecting seat 16 arranged near the spray gatehouse 15. The spray gatehouse 15 and the connecting seat 16 are both arranged on the base platform 14 at intervals, and the driving moving component is arranged at the top position of the spray gatehouse. It also includes a powder recovery mechanism 17, and the powder recovery mechanism 17 is arranged at a side position of the spray gatehouse. The powder recovery mechanism 17 includes a negative pressure chamber and a filter chamber. A filter assembly is arranged in the filter chamber, and an air inlet is also opened on the filter chamber. An air outlet is also opened on the negative pressure chamber. The filter chamber is connected to the negative pressure chamber. The negative pressure chamber is used to inhale the waste gas containing powder from the air inlet, and the filter assembly is used to intercept the powder in the passing waste gas in the filter chamber. The air outlet is used to discharge the filtered waste gas, and the filter chamber is movably connected to the negative pressure chamber.

[0041] In a further embodiment, the present invention further provides a spraying method for a water heater tank, comprising a controller, a spraying device, and an automatic transport device, wherein the controller is connected to the spraying device, the film thickness detection instrument, and the automatic transport device, and the automatic transport device comprises a manipulator, specifically comprising the following steps:

[0042] S1. Move multiple groups of water heater inner tank workpieces to be sprayed onto the spraying device by a manipulator;

[0043] S2, starting the clamping device in the spraying device to clamp the workpiece to be sprayed entering the spraying room of the spraying device;

[0044] S3, start the constant voltage electrostatic spray gun in the spraying device, lock the set working voltage value, and maintain a stable electrostatic output without being affected by the environment, open the spray gun parts to perform positive and negative spraying in turn, and after the spraying is completed, check whether the film thickness of the connection port on the sprayed workpiece meets the spraying thickness standard; in the process of spraying the inner tank, it is difficult to meet the requirement of 300 microns for the first spraying, so a second spraying is required;

[0045] S4, move the qualified workpieces to the next process, re-spray the unqualified workpieces, and then conduct a second inspection, and move the qualified workpieces to the next process. During spraying, the powder recovery mechanism in the spraying device is simultaneously turned on to recover the powder in the powder spraying room;

[0046] S5, cycle operation, after the previous set of water heater inner tank workpieces are sprayed, the next set of water heater inner tank workpieces are sprayed;

[0047] The spraying device is a spraying device for the inner tank of a water heater provided by any of the above-mentioned preferred embodiments. The above steps are set for spraying the inner tank structure of the water heater. While ensuring the overall powder coating rate, it also ensures that the spraying surface and spraying thickness of each connecting port on the inner tank structure meet the requirements, avoiding the coating thickness at the connecting port being too thin to cause leakage or corrosion.

[0048] Specifically, the following embodiment 1 is also included:

[0049] S1. Move multiple groups of water heater inner tank workpieces to be sprayed onto the spraying device by a manipulator;

[0050] S2, starting the clamping device in the spraying device to clamp the workpiece to be sprayed entering the spraying room of the spraying device;

[0051] S3, start the constant voltage electrostatic spray gun in the spray device, lock the set working voltage value, and maintain a stable electrostatic output without being affected by the environment. The charge amount of the spray gun reaches the set voltage power supply index, and the power supply voltage is adjusted to 50-70KV. Specifically, it can be set to 65KV, 68KV, or 70KV, and then turn on the spray gun to perform the first positive electrode spraying. After completion, perform the second negative electrode spraying;

[0052] After two times of positive and negative electrode spraying, the film thickness detection instrument is turned on for the first film thickness detection to detect whether the film thickness of the connection port on the sprayed workpiece meets the spray thickness standard. In the process of spraying the inner tank, it is difficult to meet the requirement of 300 microns for the first spraying. Therefore, the positive and negative electrode spraying is adjusted according to the film thickness detection situation.

[0053] S4, move the qualified workpieces to the next process, re-spray the unqualified workpieces, and then perform a secondary film thickness test. Move the qualified workpieces to the next process, and simultaneously start the powder recovery mechanism in the spraying device to recover the powder in the powder spraying room during spraying;

[0054] S5, cycle operation, after the previous set of water heater inner tank workpieces are sprayed, the next set of water heater inner tank workpieces are sprayed;

[0055] Embodiment 2:

[0056] S1. Move multiple groups of water heater inner tank workpieces to be sprayed onto the spraying device by a manipulator;

[0057] S2, starting the clamping device in the spraying device to clamp the workpiece to be sprayed entering the spraying room of the spraying device;

[0058] S3, start the constant voltage electrostatic spray gun in the spraying device, lock the set working voltage value, and maintain a stable electrostatic output without being affected by the environment, the spray gun charging amount reaches the set voltage power supply index, adjust the power supply voltage to 50-70KV, specifically, it can be set to 55KV, 65KV, or 69KV, and then turn on the spray gun to carry out the first positive electrode spraying, and after completion, carry out the second negative electrode spraying;

[0059] After two times of positive and negative electrode spraying, the film thickness detection instrument is turned on for the first film thickness detection to detect whether the film thickness of the connection port on the sprayed workpiece meets the spray thickness standard. In the process of spraying the inner tank, it is difficult to meet the requirement of 300 microns for the first spraying. Therefore, the positive and negative electrode spraying is adjusted according to the film thickness detection situation.

[0060] S4, move the qualified workpieces to the next process, re-spray the unqualified workpieces, and then perform a secondary film thickness test. Move the qualified workpieces to the next process, and simultaneously start the powder recovery mechanism in the spraying device to recover the powder in the powder spraying room during spraying;

[0061] S5, cycle operation, after the previous set of water heater inner tank workpieces are sprayed, the next set of water heater inner tank workpieces are sprayed.

[0062] Through Examples 1 and 2, the powder coating rate and coating thickness of the spraying can meet the coating thickness requirements required for the inner tank of the water heater, ensuring the comprehensiveness of the spraying of the inner tank-shaped workpiece and avoiding powder accumulation at the water inlet and outlet interfaces.

[0063] The beneficial effects of the present invention are as follows: the present invention provides a spraying device for spraying the inner tank of a water heater, a spraying line platform body and a spraying mechanism are provided, the spraying mechanism comprises a first spraying component, a second spraying component, a clamping component and a driving and moving component, the clamping component is used to clamp and fix the workpiece to be sprayed, the driving and moving component is used to drive the workpiece to be sprayed to move at a uniform speed on the spraying line platform, the clamping component is arranged above the spraying line platform, the spraying mechanism also comprises a constant voltage spraying power supply component, the constant voltage spraying power supply component is electrically connected to the first spraying component and the second spraying component, and is used to provide a constant voltage spraying voltage to the first spraying component and the second spraying component, the first spraying component is used to spray the first azimuth surface of the workpiece to be sprayed, and the second spraying component is used to spray the second azimuth surface of the workpiece to be sprayed, so as to ensure the powder application rate and coating thickness of the spraying, ensure the comprehensiveness of the spraying of the inner tank-shaped workpiece, avoid powder accumulation at the inlet and outlet water interfaces, and improve the spraying efficiency of the inner tank-shaped container.

[0064] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A spraying device for a water heater inner tank, characterized in that: It includes a spraying line platform body and a spraying mechanism arranged on the spraying line platform, the spraying mechanism includes a first spraying component, a second spraying component, a clamping component and a driving and moving component, the first spraying component and the second spraying component are relatively arranged on both sides of the spraying line platform, the clamping component is used to clamp and fix the workpiece to be sprayed, the driving and moving component is used to drive the workpiece to be sprayed to move at a uniform speed on the spraying line platform, the clamping component is arranged above the spraying line platform, the spraying mechanism also includes a constant voltage spraying power supply component, the constant voltage spraying power supply component is electrically connected to the first spraying component and the second spraying component, and is used to provide a constant voltage spraying voltage to the first spraying component and the second spraying component, the first spraying component is used to spray the first azimuth surface of the workpiece to be sprayed, and the second spraying component is used to spray the second azimuth surface of the workpiece to be sprayed.

2. The spraying device for the inner tank of a water heater according to claim 1, characterized in that: The first spraying assembly includes a reciprocating machine and a spray gun component, the spray gun component is slidably connected to the reciprocating machine through a sliding seat, the spray gun component includes a spray gun unit, the spray gun unit is provided with a first spray gun unit and a second spray gun unit, the first spray gun unit and the second spray gun unit are arranged at an interval, the sliding seat is provided with a sliding bottom plate and a connecting rod, the connecting rod is provided with a connecting long rod body and a transfer rod, the connecting long rod body is rotatably connected to the transfer rod, the spray gun unit is rotatably connected to the connecting rod through a spray gun connecting assembly, the spray gun connecting assembly includes a short rod connecting body and a connecting seat, one end of the short rod connecting body is connected to the spray gun unit, and the other end of the short rod connecting body is rotatably connected to the connecting seat.

3. The spraying device for the inner tank of a water heater according to claim 1, characterized in that: The second spray assembly includes a spray gun connecting seat and a spray gun mechanism, the spray gun mechanism is rotatably connected to the spray gun connecting seat, the spray gun connecting seat is slidably connected to the spray reciprocating machine, the spray gun connecting seat includes a sliding base and a spray connecting rod assembly, the spray connecting rod assembly is detachably connected to the sliding base, the second spray assembly is used to spray the connecting port on the workpiece to be sprayed, the spray gun mechanism includes a straight-line nozzle, and the straight-line nozzle is detachably connected to the spray gun mechanism.

4. The spraying device for the inner tank of a water heater according to claim 3, characterized in that: The spraying connecting rod assembly is provided with a connecting rod body and a rod connecting seat block, wherein two rod connecting seat blocks are provided, and both ends of the connecting rod body are connected to the sliding base through the rod connecting seat blocks, and the rod connecting seat blocks are rotatably connected to the connecting rod body.

5. The spraying device for the inner tank of a water heater according to claim 4, characterized in that: The rod body connecting seat block has the same structure as the connecting seat. The rod body connecting seat block is provided with an upper connecting seat block and a base connecting block. The upper connecting seat block is rotatably connected to the base connecting block. The upper connecting seat block is provided with a connecting channel for connecting the connecting rod body, and part of the connecting rod body is fixedly connected to the connecting channel.

6. The spraying device for the inner tank of a water heater according to claim 1, characterized in that: The constant-voltage spraying power supply assembly comprises a constant-voltage power supply box, and the constant-voltage power supply box is arranged on the spraying line platform body.

7. The spraying device for the inner tank of a water heater according to claim 1, characterized in that: The driving moving assembly is provided with an inverted hanging part, a movable connecting seat and a power driving part. The inverted hanging part is used to hang the workpiece to be sprayed. The movable connecting seat is connected to the inverted hanging part. The power driving part is transmission-connected to the movable connecting seat. The power driving part is a stepping motor driving part.

8. The spraying device for the inner tank of a water heater according to claim 1, characterized in that: The clamping assembly includes a clamping connection seat and a clamping unit arranged on the clamping connection seat, the clamping unit includes a first clamping unit and a second clamping unit, the first clamping unit is used to clamp the workpiece to be sprayed in a first azimuth plane, and the second clamping unit is used to clamp the workpiece to be sprayed in a second azimuth plane, the clamping unit is provided with a clamping column and a clamping wheel, the clamping wheel is fixedly connected to the clamping column, the clamping column is rotatably connected to the clamping connection seat, the clamping unit is provided with more than two groups of clamping columns and clamping wheels, the two clamping columns are rotatably connected to the clamping connection seat at an angle, the first clamping unit and the second clamping unit will form a circular clamping space for clamping the workpiece to be sprayed in front and back azimuth planes, the first clamping unit is provided with a plurality of groups, the second clamping unit is provided with a plurality of groups, each of the first clamping units is arranged at intervals, and each of the clamping units is arranged at intervals.

9. The spraying device for the inner tank of a water heater according to claim 1, characterized in that: The spray line platform body includes a base platform, a spray gatehouse, and a connecting seat arranged near the spray gatehouse. The spray gatehouse and the connecting seat are both arranged at intervals on the base platform. The driving moving component is arranged at the top position of the spray gatehouse, and also includes a powder recovery mechanism. The powder recovery mechanism is arranged at a side position of the spray gatehouse. The powder recovery mechanism includes a negative pressure chamber and a filter chamber. A filter component is arranged in the filter chamber. An air inlet is also opened on the filter chamber. An air outlet is also opened on the negative pressure chamber. The filter chamber is connected with the negative pressure chamber. The negative pressure chamber is used to inhale the waste gas containing powder from the air inlet. The filter component is used to intercept the powder in the passing waste gas in the filter chamber. The air outlet is used to discharge the filtered waste gas. The filter chamber is movably connected with the negative pressure chamber.

10. A spraying method for a water heater inner tank, comprising a controller, a spraying device, the controller being connected to the spraying device, a film thickness detection instrument, and an automatic transport device, the automatic transport device comprising a manipulator, characterized in that: The specific steps include: S1. Move multiple groups of water heater inner tank workpieces to be sprayed onto the spraying device by a manipulator; S2, starting the clamping device in the spraying device to clamp the workpiece to be sprayed entering the spraying room of the spraying device; S3, start the constant voltage electrostatic spray gun in the spraying device, lock the set working voltage value, and maintain a stable electrostatic output without being affected by the environment, open the spray gun parts to perform positive and negative electrode spraying once or twice in sequence, and after the spraying is completed, check whether the film thickness of the connection port on the sprayed workpiece meets the spraying thickness standard; S4, move the qualified workpieces to the next process, re-spray the unqualified workpieces, and then perform a secondary film thickness test. Move the qualified workpieces to the next process, and simultaneously start the powder recovery mechanism in the spraying device to recover the powder in the powder spraying room during spraying; S5, cycle operation, after the previous set of water heater inner tank workpieces are sprayed, the next set of water heater inner tank workpieces are sprayed; The spraying device is a spraying device for the inner tank of a water heater as described in any one of claims 1 to 9 above.

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