A roll applicator

Abstract

The application relates to a rolling spraying machine and relates to the technical field of spraying equipment. The rolling spraying machine comprises an inner roller and a fixed outer cylinder, the inner roller is rotatably arranged in the fixed outer cylinder, an annular gap region is formed between the fixed outer cylinder and the inner roller, an inductive coil is fixedly arranged on the outer wall of the fixed outer cylinder, and the inductive coil generates an alternating magnetic field when electrified, so that the inner roller generates eddy current and is self-heated. The application has the effects of high reliability, easy maintenance, high energy efficiency and low energy consumption.

Description

Technical Field

[0001] This application relates to the technical field of spraying equipment, and in particular to a roller spraying machine. Background Technology

[0002] A roller spraying machine is a specialized piece of equipment used for spraying coatings onto the surfaces of small parts. Existing automatic roller spraying machines typically include a spray gun, a roller mechanism, and a heating mechanism. The parts are placed inside the roller mechanism, and during the spraying process, the roller rotates continuously, ensuring that the surface of the parts is evenly exposed to the spraying medium. At the same time, the heating mechanism heats the inner cavity of the roller to promote coating curing or improve adhesion.

[0003] Currently, common heating methods mainly include oil bath heating and hot air heating. Oil bath heating indirectly heats the drum through hot oil circulation. Although it provides stable and uniform temperature, its system structure is complex, it occupies a large area, consumes a lot of energy, and suffers from problems such as oil leakage and difficulty in subsequent cleaning, resulting in high equipment manufacturing and maintenance costs.

[0004] Hot air heating involves using a fan to blow heated air into the drum through an air duct. This method typically includes an inlet filter to prevent external impurities from entering, while air inlets are created in the drum wall to facilitate hot air flow. However, in practical applications, coating powder suspended during spraying easily adheres to and accumulates on the inlet filter, causing clogging and requiring frequent shutdowns for cleaning or filter replacement. Furthermore, fine powder can also enter the fan through the air supply system, causing fan contamination and damage, further increasing maintenance costs and the risk of malfunction. Utility Model Content

[0005] To address the issues of complex heating systems and high maintenance costs associated with existing roll-to-roll spraying machines, this application provides a roll-to-roll spraying machine.

[0006] The roll-jet spraying machine provided in this application adopts the following technical solution: A roller spraying machine includes an inner roller and a fixed outer cylinder. The inner roller is rotatably disposed inside the fixed outer cylinder. An annular gap region is formed between the fixed outer cylinder and the inner roller. An induction coil is fixedly disposed on the outer wall of the fixed outer cylinder. When the induction coil is energized, it generates an alternating magnetic field, which causes the inner roller to generate eddy currents and self-heat.

[0007] By adopting the above technical solution, a fixed outer cylinder is set outside the rotatable inner cylinder, forming an annular gap between them. An induction coil is installed on the outer wall of the fixed outer cylinder. When alternating current is applied to the induction coil, an alternating magnetic field is generated. The alternating magnetic field penetrates the fixed outer cylinder, causing eddy currents on the surface of the inner cylinder, thereby utilizing the resistance of the metal material to achieve self-heating of the inner cylinder. Compared with the existing heating methods of hot air heating and oil bath heating, this solution does not require a complex oil circulation system and hot air supply system. The system structure is simpler and the energy consumption is lower. Furthermore, since the heating process relies on the self-heating of the inner cylinder, there is no need to introduce air or liquid from the outside, avoiding the problems of filter clogging and powder contamination of the fan system in hot air heating, as well as the risk of oil leakage in oil bath heating, greatly reducing maintenance costs and failure rates.

[0008] Preferably, the induction coil is disposed on the outer peripheral wall and end wall of the fixed outer cylinder.

[0009] Preferably, the induction coils are provided in several groups, with each group of induction coils spaced apart.

[0010] Preferably, the device includes a frame, the fixed outer cylinder is fixedly installed on the frame, the central axis of the inner roller extends outward to form a rotating shaft, the rotating shaft is rotatably supported on the frame by bearings, and the rotating shaft is connected to a drive mechanism for driving the rotating shaft to rotate.

[0011] Preferably, it also includes a base, the frame is mounted on the base, the frame includes a support plate and a support column fixedly connected to the support plate, one end of the support column is fixedly connected to the outer wall of the fixed outer cylinder, the other end of the support column is fixed relative to the base, the support column is inclined upward relative to the base so that the fixed outer cylinder and the inner roller are in an inclined state, and the rotating shaft is rotatably supported on the support plate by bearings.

[0012] Preferably, a supporting vertical column is hinged to one end of the supporting column away from the fixed outer cylinder, and the supporting vertical column is fixedly connected to the base. A supporting inclined column is hinged to the middle of the supporting column, and a sliding bracket is hinged to one end of the supporting inclined column away from the supporting column. A positioning frame is provided outside the sliding bracket, and the positioning frame is fixed to the base. The positioning frame encloses a rectangular hollow area, and the sliding bracket slides along the inner edge of the positioning frame within the rectangular hollow area to adjust the tilt angle of the supporting column.

[0013] Preferably, the positioning frame includes a front rod and side rods fixed at both ends of the front rod. The two ends of the sliding bracket abut against the two side rods and slide along the length direction of the side rods. A drive rod passes through the front rod, and a through hole is provided on the front rod. A threaded hole is provided on the sliding bracket at a position corresponding to the through hole. The drive rod passes through the through hole on the front rod and forms a threaded pair with the threaded hole of the sliding bracket. The sliding bracket moves along the side rod by rotating the drive rod.

[0014] Preferably, it also includes a roller end cap and a spray gun. The roller end cap includes two semi-circular cylindrical caps respectively hinged to the fixed outer cylinder. One of the cylindrical caps is provided with a spray nozzle. The roller end cap is provided with a mounting part for mounting the spray gun. The spray gun is positioned aligned with the spray nozzle.

[0015] Preferably, the mounting component includes a transverse adjusting rod arranged along the length of the spray nozzle and a longitudinal adjusting rod fixed to one end of the transverse adjusting rod. The transverse adjusting rod is axially fitted with a mounting sleeve, which is fixed to the cylinder cover. A set screw passes through the mounting sleeve. The transverse adjusting rod can slide along the axial direction of the mounting sleeve and is fixed by the set screw. The longitudinal adjusting rod is provided with a waist-shaped groove, and an adjusting bolt passes through the waist-shaped groove. The spray gun is fixedly connected to the adjusting bolt, and the adjusting bolt slides within the waist-shaped groove to move the spray gun closer to or away from the spray nozzle.

[0016] Preferably, it further includes a detection device for detecting the rotational state of the inner roller, wherein a rod extends radially from the rotational shaft, the rod rotates with the rotational shaft and periodically passes through the detection device to trigger the detection device to generate a signal.

[0017] In summary, this application includes at least one of the following beneficial technical effects: With high reliability, low failure rate, and easy cleaning and maintenance, it eliminates the traditional air duct and oil circuit system, fundamentally eliminating problems such as filter clogging, oil leakage, and fan pollution that lead to equipment failure and high-frequency maintenance. It greatly improves the stability and reliability of equipment operation. The equipment does not require complicated pipes and filters, making maintenance and upkeep simpler. Uniform heating improves product quality. Induction heating ensures that the entire inner drum wall heats up evenly, and the heat is directly transferred to the parts inside the drum, avoiding the uneven temperature problem caused by hot air heating, thus ensuring the consistency and stability of the coating curing quality. It boasts high energy efficiency and low energy consumption. Electromagnetic induction heating has high thermal efficiency, concentrating energy on the inner drum and reducing heat loss. Furthermore, it eliminates the need for complex oil circulation or hot air delivery systems, resulting in a simpler, more compact system structure and even lower energy consumption. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the roller spraying machine in the embodiments of this application.

[0019] Figure 2 This is a partial structural schematic diagram of the roller spraying machine in an embodiment of this application.

[0020] Figure 3 This is a three-dimensional structural schematic diagram of the roller spraying machine from another perspective in an embodiment of this application.

[0021] Figure 4 This is a cross-sectional view of the roller assembly of the roller spraying machine in an embodiment of this application.

[0022] Figure 5 This is a three-dimensional structural schematic diagram of the roller spraying machine from another perspective in an embodiment of this application.

[0023] Figure 6 This is another partial structural schematic diagram of the roller spraying machine in the embodiments of this application.

[0024] Figure 7 yes Figure 6 Enlarged diagram of point A in the middle.

[0025] Figure 8 yes Figure 3 Enlarged diagram of point B in the middle.

[0026] Explanation of reference numerals in the attached drawings: 1. Roller assembly; 2. Frame; 3. Base; 4. Spray gun; 11. Fixed outer cylinder; 12. Inner roller; 13. Annular gap area; 5. Induction coil; 121. Rotating shaft; 6. Drive mechanism; 21. Support plate; 22. Support column; 122. Stirring column; 23. Support vertical column; 24. Support inclined column; 25. Sliding bracket; 31. Positioning frame; 32. Slide groove; 311. Rectangular hollow area; 312. Front rod; 313. Side rod; 314. Drive rod; 7. Roller end cover; 71. Cylinder cover; 711. Spray nozzle; 72. Temperature detector; 8. Exhaust duct; 73. Mounting component; 731. Lateral adjustment rod; 732. Longitudinal adjustment rod; 733. Mounting bushing; 734. Set screw; 735. Adjusting bolt; 9. Detection device; 123. Support rod; 91. Lever. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail.

[0028] This application discloses a roll-on spraying machine. (Refer to...) Figure 1 and Figure 2The roller spraying machine includes a roller assembly 1, a frame 2, a base 3, and a spray gun 4. The roller assembly 1 is mounted on the frame 2, and the frame 2 is mounted on the base 3. The base 3 is equipped with a control panel for operating the roller spraying machine. The roller assembly 1 includes a fixed outer cylinder 11 and an inner roller 12. The fixed outer cylinder 11 is sleeved on the outside of the inner roller 12, and an annular gap region 13 is formed between the fixed outer cylinder 11 and the inner roller 12. An induction coil 5 is fixedly mounted on the outer wall of the fixed outer cylinder 11. When the induction coil 5 is energized, it generates an alternating magnetic field that causes eddy currents in the inner roller 12, resulting in self-heating. The inner roller 12 is rotatably disposed inside the fixed outer cylinder 11. The workpiece to be processed is placed in the inner roller 12. During operation, the inner roller 12 continuously rotates and heats up, and the spray gun 4 sprays the coating into the inner roller 12 to coat the workpiece.

[0029] Reference Figure 3 and Figure 4 The inner roller 12 is made of ferromagnetic metal, while the fixed outer cylinder 11 is made of non-magnetic metal or high-temperature engineering plastic to ensure that the alternating magnetic field generated by the induction coil 5 after being energized with alternating current can effectively penetrate and act on the inner roller 12. The induction coil 5 is fixedly laid on the outer wall of the fixed outer cylinder 11. As a preferred layout, the induction coil 5 is wound around the outer peripheral wall and the bottom end wall of the fixed outer cylinder 11. The induction coil 5 on the outer peripheral wall of the fixed outer cylinder 11 is mainly used to heat the body of the inner roller 12, while the induction coil 5 on the bottom end wall of the fixed outer cylinder 11 is used to heat the bottom area of ​​the inner roller 12. The induction coil 5 is evenly distributed on the outer peripheral wall and the end wall of the fixed outer cylinder 11 to make the heating of the inner roller 12 more uniform.

[0030] Several sets of induction coils 5 are arranged at intervals. Multiple sets of induction coils 5 can be connected in series and powered and controlled by a single main power controller. Alternatively, multiple sets of induction coils 5 can be connected in parallel and controlled by independent power controllers, enabling zoned temperature control. In the series configuration, one induction coil 5 can be wound multiple times and arranged in multiple sets at intervals, or each induction coil 5 can be wound multiple times as a set, with multiple induction coils arranged at intervals and connected in series. In one embodiment, the induction coils 5 located on the outer peripheral wall of the fixed outer cylinder 11 and the induction coils 5 located on the end walls of the fixed outer cylinder 11 are controlled by independent power supplies, allowing the temperature distribution in different areas of the inner roller 12 to be controlled by adjusting the power of the coils in different areas. In another embodiment, multiple sets of induction coils 5 located on the outer peripheral wall of the fixed outer cylinder 11 are arranged at intervals and connected in parallel. This method enables independent axial multi-segment temperature control of the inner roller 12, thereby achieving complex temperature curves to adapt to different process requirements. Meanwhile, the multiple coil spacing provides a certain degree of fault redundancy. When one coil fails, the other coils can continue to work, and maintenance and replacement are simpler and more convenient. In addition, it can provide heating on demand, saving energy.

[0031] Reference Figure 4 and Figure 5 A fixed outer cylinder 11 is fixedly mounted on a frame 2, and an inner roller 12 is rotatably connected to the frame 2. In a preferred embodiment, the central axes of the fixed outer cylinder 11 and the inner roller 12 are aligned, forming a uniform annular gap region 13 between them. The central axis of the inner roller 12 extends outward to form a rotating shaft 121, which is fixedly connected to the inner roller 12. The rotating shaft 121 passes through the bottom of the fixed outer cylinder 11 and connects to the frame 2. Specifically, a bearing seat is fixed on the frame 2, and the rotating shaft 121 is rotatably supported on the bearing seat by a rolling bearing. A drive mechanism 6 is connected to the rotating shaft 121. The drive mechanism 6 drives the rotating shaft 121 to rotate, thereby rotating the inner roller 12. The output shaft of the drive mechanism 6 is connected to the rotating shaft 121, and the drive mechanism 6 can drive the rotating shaft 121 by means of a pulley or chain.

[0032] Reference Figure 3 and Figure 5 The frame 2 includes a support plate 21 and a support column 22 for supporting the rotating shaft 121. The support column 22 is fixedly connected to the support plate 21 by bolts or welding. The rotating shaft 121 is rotatably supported on the support plate 21 by bearings. The drive mechanism 6 can also be mounted on the support plate 21. One end of the support column 22 is fixedly connected to the outer wall of the fixed outer cylinder 11, and the other end of the support column 22 is fixed relative to the base 3. The support column 22 is inclined upward relative to the base 3 so that the fixed outer cylinder 11 and the inner roller 12 are in an inclined state. The inner roller 12 rotates in an inclined state, so that the workpiece will not only tumble but also move axially due to gravity, thereby achieving a better mixing and heating effect.

[0033] Reference Figure 2 The inner circumferential wall of the inner roller 12 is provided with stirring columns 122. Preferably, the stirring columns 122 are arranged circumferentially on the inner circumferential wall of the inner roller 12 and are integrally formed with the inner roller 12. Several stirring columns 122 help to mix the workpiece evenly.

[0034] Reference Figure 3 and Figure 5In one embodiment, a support column 22 is hinged to a support vertical column 23 at one end away from the fixed outer cylinder 11. One end of the support vertical column 23 is hinged to one end of the support column 22. The other end of the support vertical column 23 is fixedly connected to the base 3 by bolts or welding. A support inclined column 24 is hinged to the middle of the support column 22. One end of the support inclined column 24 is hinged to the support column 22. The other end of the support inclined column 24 is hinged to a sliding bracket 25. The sliding bracket 25 can slide back and forth along the base 3, so that the angle of the linkage structure formed by the support inclined column 24, the support column 22 and the support vertical column 23 changes, thereby realizing the adjustment of the tilt angle of the roller assembly 1.

[0035] Reference Figure 2 and Figure 3 The sliding bracket 25 is externally provided with a positioning frame 31, which is fixed to the base 3 by bolts or welding. The positioning frame 31 encloses a rectangular hollow area 311, within which the sliding bracket 25 is constrained. Both ends of the sliding bracket 25 can slide along the inner edge of the positioning frame 31 to adjust the tilt angle of the support column 22. The two sides of the positioning frame 31 are constructed in an inverted L-shape to form a sliding groove 32 for the sliding ends of the sliding bracket 25 to slide. The upper wall of the groove 32 restricts the sliding bracket 25 from moving upward.

[0036] The positioning frame 31 includes a front rod 312 and side rods 313 fixed at both ends of the front rod 312. Since the tilt angle adjustment range does not require the sliding bracket 25 to slide to the rear end of the positioning frame 31, a rear rod is not required at the rear end of the positioning frame 31 opposite to the front rod 312. The front rod 312 and the two side rods 313 enclose a rectangular hollow region 311 with a non-closed rear end. A drive rod 314 passes through the front rod 312, and the drive rod 314 is positioned along the sliding direction of the sliding bracket 25. A through hole is provided on the front rod 312, and a threaded hole is provided at the corresponding position on the sliding bracket 25. The drive rod 314 passes through the through hole on the front rod 312 and the threaded hole on the sliding bracket 25 in sequence to form a threaded pair. When the drive rod 314 is rotated, the drive rod 314 drives both ends of the sliding bracket 25 to abut against the two side rods 313 and slide along the length direction of the side rods 313.

[0037] Reference Figure 6The roller assembly 1 also includes roller end caps 7, which consist of two semi-circular end caps 71 respectively hinged to the fixed outer cylinder 11. This split end cap design facilitates the design of an integrated spray gun 4 system. One end cap 71 has a spray nozzle 711, and the spray gun 4 and the spray nozzle 711 are located on the same end cap 71. The other end cap 71 can be equipped with a temperature detector 72 and an exhaust duct 8. When loading or unloading is required, only one end cap 71 needs to be opened, making the operation more labor-saving and efficient. The temperature detector 72 is used to detect the temperature inside the inner roller 12 for timely monitoring and temperature control. The exhaust duct 8 is used to discharge the exhaust gas generated during the spraying process, ensuring operational safety, and also guides airflow to achieve a more uniform coating curing effect.

[0038] Reference Figure 6 and Figure 7 The roller end cap 7 is provided with a mounting part 73 for mounting the spray gun 4. The spray gun 4 is mounted on the cylinder cap 71 and aligned with the spray nozzle 711 via the mounting part 73. The mounting part 73 includes a horizontal adjusting rod 731 and a vertical adjusting rod 732 fixedly connected. The spray nozzle 711 is an oblong hole. The horizontal adjusting rod 731 is arranged along the length of the spray nozzle 711 to adjust the position of the spray gun 4 in the spray nozzle 711 laterally. At the same time, the horizontal adjusting rod 731 can rotate circumferentially to adjust the spray angle of the spray gun 4. The vertical adjusting rod 732 is fixed to one end of the horizontal adjusting rod 731 and is used to adjust the distance between the spray gun 4 and the spray nozzle 711 longitudinally. The spray gun 4 is fixed on the vertical adjusting rod 732. Specifically, a mounting sleeve 733 is fixed on the cylinder cover 71. A transverse adjusting rod 731 passes axially through the mounting sleeve 733. A set screw 734 passes through the mounting sleeve 733, and the set screw 734 abuts against the transverse adjusting rod 731 to fix it. When it is necessary to adjust the transverse adjusting rod 731, the set screw 734 can be loosened to adjust the transverse adjusting rod 731 axially or circumferentially. A waist-shaped groove is provided on the longitudinal adjusting rod 732. The waist-shaped groove is preferably set perpendicular to the transverse adjusting rod 731. An adjusting bolt 735 passes through the waist-shaped groove. The spray gun 4 is fixedly connected to the adjusting bolt 735. The adjusting bolt 735 can slide along the waist-shaped groove and be fixed, thereby adjusting the distance between the spray gun 4 and the spray nozzle 711. By adjusting the coverage area, spray distance, and spray angle of the spray by adjusting the transverse adjusting rod 731 and the longitudinal adjusting rod 732, the final working position of the spray gun 4 can be precisely adjusted, ensuring the uniformity of the spray and the high quality of the coating of the roller sprayer.

[0039] The roller spraying machine also includes a detection device 9, which is used to detect the rotation state of the inner roller 12 and count the rotations of the inner roller 12. The detection device 9 can be a proximity switch, fixed to the support plate 21. A rod 123 extends radially from the rotating shaft 121. When the rod 123 rotates with the rotating shaft 121, it triggers the proximity switch to generate a signal each time it passes through the sensing area of ​​the proximity switch. The periodic signal generated by the proximity switch can detect whether the inner roller 12 is in a rolling state and count the rotations of the inner roller 12. In another embodiment, the detection device 9 includes a lever 91. When the lever 91 contacts the rod 123, the detection device 9 generates a signal to indicate the rotation state of the inner roller 12.

[0040] The implementation principle of a roller spraying machine according to an embodiment of this application is as follows: During operation, the induction coil 5 is connected to an AC power supply. When the AC power passes through the induction coil 5, a high-intensity alternating magnetic field is generated around the induction coil 5. This alternating magnetic field penetrates the fixed outer cylinder 11 and acts on the rotating inner roller 12 inside. Eddy currents are generated inside the inner roller 12, causing the cylinder wall of the inner roller 12 to heat up on its own. The heat is directly and evenly transferred to the workpiece tumbling inside the inner roller 12 through thermal radiation and conduction, thereby enabling uniform and efficient completion of the spraying and coating curing process. In this process, the temperature can be adjusted by changing the power of the induction coil 5, the tilt angle of the roller assembly 1 can be adjusted by rotating the drive rod 314 to slide the sliding bracket 25, the spraying range and spraying position can be adjusted by adjusting the set screw 734 and the adjusting bolt 735, and the rolling state of the inner roller 12 can be detected by the detection device 9.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A roller spraying machine, comprising an inner roller (12), characterized in that: It also includes a fixed outer cylinder (11), and the inner roller (12) is rotatably disposed inside the fixed outer cylinder (11). An annular gap region (13) is formed between the fixed outer cylinder (11) and the inner roller (12). An induction coil (5) is fixedly provided on the outer wall of the fixed outer cylinder (11). When the induction coil (5) is energized, it generates an alternating magnetic field, which causes the inner roller (12) to generate eddy currents and self-heat.

2. The roll-on spraying machine according to claim 1, characterized in that: The induction coil (5) is disposed on the outer peripheral wall and end wall of the fixed outer cylinder (11).

3. The roller spraying machine according to claim 2, characterized in that: The induction coil (5) is provided in several groups, and the induction coil (5) in each group is arranged at intervals.

4. The roller spraying machine according to claim 1, characterized in that: Includes a frame (2), the fixed outer cylinder (11) is fixedly installed on the frame (2), the central axis of the inner roller (12) extends outward to form a rotating shaft (121), the rotating shaft (121) is rotatably supported on the frame (2) by bearings, and the rotating shaft (121) is connected to a drive mechanism (6) for driving the rotating shaft (121) to rotate.

5. The roller spraying machine according to claim 4, characterized in that: It also includes a base (3), the frame (2) is mounted on the base (3), the frame (2) includes a support plate (21) and a support column (22) fixedly connected to the support plate (21), one end of the support column (22) is fixedly connected to the outer wall of the fixed outer cylinder (11), and the other end of the support column (22) is fixed relative to the base (3). The support column (22) is inclined upward relative to the base (3) so that the fixed outer cylinder (11) and the inner roller (12) are in an inclined state. The rotating shaft (121) is rotatably supported on the support plate (21) by a bearing.

6. The roller spraying machine according to claim 5, characterized in that: The support column (22) is hinged to a support column (23) at one end away from the fixed outer cylinder (11). The support column (23) is fixedly connected to the base (3). The support column (22) is hinged to a support inclined column (24) at the middle. The support inclined column (24) is hinged to a sliding bracket (25) at one end away from the support column (22). The sliding bracket (25) is provided with a positioning frame (31). The positioning frame (31) is fixed to the base (3). The positioning frame (31) encloses a rectangular hollow area (311). The sliding bracket (25) slides along the inner edge of the positioning frame (31) within the rectangular hollow area (311) to adjust the tilt angle of the support column (22).

7. The roll-on spraying machine according to claim 6, characterized in that: The positioning frame (31) includes a front rod (312) and side rods (313) fixed at both ends of the front rod (312). The two ends of the sliding bracket (25) respectively abut against the two side rods (313) and slide along the length direction of the side rods (313). The front rod (312) is provided with a drive rod (314). The front rod (312) has a through hole. The sliding bracket (25) has a threaded hole at the position corresponding to the through hole. The drive rod (314) passes through the through hole on the front rod (312) and forms a threaded pair with the threaded hole of the sliding bracket (25). By rotating the drive rod (314), the sliding bracket (25) moves along the side rod (313).

8. The roll-on spraying machine according to claim 1, characterized in that: It also includes a roller end cap (7) and a spray gun (4). The roller end cap (7) includes two semi-circular cylindrical caps (71) respectively hinged to the fixed outer cylinder (11). One of the cylindrical caps (71) is provided with a spray nozzle (711). The roller end cap (7) is provided with a mounting part (73) for mounting the spray gun (4). The spray gun (4) is aligned with the spray nozzle (711).

9. The roll-on spraying machine according to claim 8, characterized in that: The mounting component (73) includes a transverse adjusting rod (731) arranged along the length of the spray nozzle (711) and a longitudinal adjusting rod (732) fixed to one end of the transverse adjusting rod (731). The transverse adjusting rod (731) is axially fitted with a mounting sleeve (733), which is fixed to the cylinder cover (71). The mounting sleeve (733) is fitted with a set screw (734). The transverse adjusting rod (731) can slide along the axial direction of the mounting sleeve (733) and be fixed by the set screw (734). The longitudinal adjusting rod (732) is provided with a waist-shaped groove, and an adjusting bolt (735) is fitted in the waist-shaped groove. The spray gun (4) is fixedly connected to the adjusting bolt (735). The adjusting bolt (735) slides in the waist-shaped groove to move the spray gun (4) closer to or away from the spray nozzle (711).

10. The roll-on spraying machine according to claim 4, characterized in that: It also includes a detection device (9) for detecting the rotation state of the inner roller (12), wherein a rod (123) extends radially from the rotating shaft (121), the rod (123) rotates with the rotating shaft (121) and can periodically pass through the detection device (9) to trigger the detection device (9) to generate a signal.

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