Spraying device for inner coating of steel pipe

Abstract

The utility model relates to a steel pipe inner coating spraying device which comprises a pneumatic motor driving seat, a valve core, a coating pipe, a pneumatic motor, a rotary spray head fixing shaft and a rotary spray head, and the pneumatic motor driving seat is connected with the pneumatic motor through the valve core; the coating pipe is connected with the pneumatic motor driving seat; and the rotary spray head is connected with the pneumatic motor through the rotary spray head fixing shaft. Compared with the prior art, integration of the coating atomization effect and the spraying device is enhanced, and the service life of the spraying device is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of spraying technology, and in particular to a spraying device for the inner coating of steel pipes. Background Technology

[0002] During the internal coating process of steel pipes, existing spraying equipment often suffers from low rotation speed and small atomization range, leading to defects such as uneven coating and numerous pinholes, thus affecting the first-pass yield. These problems primarily arise from insufficient spraying equipment rotation speed, resulting in poor paint atomization and an inability to form a uniform and dense coating film. Furthermore, uneven particle size distribution during spraying also contributes to insufficient coating coverage, further resulting in pinholes and leaks. Patent application CN221674691U discloses a coating spraying device for the inner wall of steel pipes, comprising: a motor; a rotary cup, which includes an outer rotary cup and an inner rotary cup, the inner rotary cup being concentrically embedded within the outer rotary cup; the lower part of the outer rotary cup wall has multiple annularly distributed through holes, and the upper part of the inner rotary cup wall has multiple annularly distributed through holes; a gap is provided between the cup walls of the outer rotary cup and the inner rotary cup; the cup opening of the rotary cup faces the motor, and the rotary cup is connected to the output shaft of the motor; and a liquid outlet pipe, which is a rigid pipe, with its front end extending into the inner rotary cup and facing the through holes on the cup wall of the inner rotary cup. This device is used to solve the problems of flow marks and uneven coating in existing epoxy resin coatings, as well as the technical problem that airless nozzles cannot be inserted into small-diameter steel pipes with diameters ranging from 158 to 406 mm, making it impossible to spray the inner wall. However, the gap between the outer and inner rotating cups of this device is easily clogged during paint spraying, and the inner rotating cup is fixedly connected to the outer rotating cup via a connecting column at the bottom of the outer rotating cup, making it difficult to clean the gap. Furthermore, the device's integrated design cannot meet the needs of actual spraying. Utility Model Content

[0003] The purpose of this invention is to overcome the defects of the prior art by providing a steel pipe internal coating spraying device, which enhances the coating atomization effect and the integration of the spraying device, and increases the service life of the spraying device.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] A steel pipe internal coating spraying device includes: a pneumatic motor drive base, a valve core, a coating pipe, a pneumatic motor, a rotary nozzle fixing shaft, and a rotary nozzle. The pneumatic motor drive base is connected to the pneumatic motor through the valve core; the coating pipe is connected to the pneumatic motor drive base; and the rotary nozzle is connected to the pneumatic motor through the rotary nozzle fixing shaft.

[0006] Furthermore, the steel pipe internal coating spraying device also includes a first coating pipe fixing frame and a second coating pipe fixing frame, which are arranged outside the pneumatic motor, and the coating pipe is fixed on the first coating pipe fixing frame and the second coating pipe fixing frame.

[0007] Furthermore, the front end of the paint tube is curved inward, and the front end of the paint tube extends into the rotating nozzle.

[0008] Furthermore, the pneumatic motor drive base is provided with an inclined outward channel, and a central hole is provided at the center of the pneumatic motor drive base. One end of the central hole is connected to an external coating pipeline, and the other end is connected to the coating pipeline through the inclined outward channel.

[0009] Furthermore, several air channels are symmetrically arranged on the left and right sides of the central hole. One end of each air channel is connected to an external compressed air pipeline, and the other end is connected to the valve core.

[0010] Furthermore, the pneumatic motor drive seat has a threaded hole at the lower edge of the end of the air passage that connects to the external compressed air pipeline.

[0011] Furthermore, the end of the threaded hole is trumpet-shaped.

[0012] Furthermore, the rotating nozzle is connected to the rotating nozzle fixed shaft by fastening screws.

[0013] Furthermore, the outer surface of the rotary nozzle is provided with uniformly distributed spiral spray holes.

[0014] Furthermore, the pneumatic motor is a pneumatic air mill, and the speed of the pneumatic air mill when unloaded is 65000 r / min.

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

[0016] 1. This utility model connects the pneumatic motor drive unit to the pneumatic motor via a valve core, and provides an inclined outward channel in the pneumatic motor drive unit to connect the paint pipe to the inclined outward channel. A central hole is provided in the center of the pneumatic motor drive unit, through which the external paint pipe is connected to the inclined outward channel. At the same time, several air channels are symmetrically arranged on the left and right sides of the central hole, through which the external compressed air pipe is connected to the valve core, thereby enhancing the integration of the spraying device.

[0017] 2. This utility model provides a threaded hole at the lower edge of the end of the pneumatic motor drive seat where the air channel connects to the external compressed air pipeline. Lubricating oil is then added to the pneumatic motor through the threaded hole, which improves the service life of the pneumatic motor and increases the service cycle of the spraying device.

[0018] 3. This utility model uses fastening screws to fix the rotating nozzle to the rotating nozzle fixing shaft, connects the rotating nozzle fixing shaft to the pneumatic motor, and provides evenly distributed spiral spray holes on the rotating nozzle, which enhances the atomization effect of the paint. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a steel pipe internal coating spraying device proposed in this utility model;

[0020] Figure 2 Here is a schematic diagram of the structure of the pneumatic motor drive base, where (2a) is a side sectional view of the pneumatic motor drive base and (2b) is a front view of the pneumatic motor drive base.

[0021] Figure 3 Here is a schematic diagram of the rotating nozzle, where (3a) is a side sectional view of the rotating nozzle and (3b) is a schematic diagram of the distribution of the spiral spray holes on the rotating nozzle.

[0022] Legend: 1. Pneumatic motor drive base; 2. Valve core; 3. First paint tube holder; 4. Paint tube; 5. Second paint tube holder; 6. Pneumatic motor; 7. Rotary nozzle holder shaft; 8. Rotary nozzle; 9. Fastening screw; 10. Spiral orifice; 11. Inclined outward channel; 12. Air channel; 13. Threaded hole. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0024] Example 1

[0025] This embodiment provides a steel pipe internal coating spraying device, such as... Figure 1 As shown, it includes: a pneumatic motor drive base 1, a valve core 2, a paint tube 4, a pneumatic motor 6, a rotary nozzle fixing shaft 7, and a rotary nozzle 8. The pneumatic motor drive base 1 is connected to the pneumatic motor 6 through the valve core 2; the paint tube 4 is connected to the pneumatic motor drive base 1; and the rotary nozzle 8 is connected to the pneumatic motor 6 through the rotary nozzle fixing shaft 7.

[0026] like Figure 2As shown in (2a), the pneumatic motor drive base 1 is provided with an inclined outward channel 11, and a central hole is provided at the center of the pneumatic motor drive base 1. One end of the central hole is connected to the external paint pipeline, and the other end is connected to the paint pipe 4 through the inclined outward channel 11. Figure 2 As shown in (2b), six air channels 12 are symmetrically arranged on the left and right sides of the central hole. One end of the air channel 12 is connected to the external compressed air pipeline, and the other end is connected to the valve core 2. The pneumatic motor drive base 1 has a threaded hole 13 at the lower edge of the end of the air channel 12 that is connected to the external compressed air pipeline. The end of the threaded hole 13 is flared and is used to add lubricating oil to the pneumatic motor 6 to improve the service life of the motor.

[0027] The pneumatic motor drive base 1 serves as the mounting foundation for the pneumatic motor 6. Air passage 12 provides an air path, ensuring that compressed air from the outside can smoothly enter the pneumatic motor 6. The valve core 2 is a key component of the air path. By controlling the airflow in and out, it regulates the speed and direction of rotation of the pneumatic motor 6. The design of the valve core 2 typically achieves efficient airflow distribution, ensuring the smooth operation of the pneumatic motor 6. The pneumatic motor 6 is the power source for the entire spraying device. Compressed air enters the valve core 2 through air passage 12, driving the rotor of the pneumatic motor 6 to rotate. The rotation of the pneumatic motor 6 provides power support for subsequent spraying actions.

[0028] The steel pipe internal coating spraying device also includes a first paint pipe fixing bracket 3 and a second paint pipe fixing bracket 5. The first paint pipe fixing bracket 3 and the second paint pipe fixing bracket 5 are located outside the pneumatic motor 6, and the paint pipe 4 is fixed to the first paint pipe fixing bracket 3 and the second paint pipe fixing bracket 5. The front end of the paint pipe 4 is bent inwards and extends into the rotating nozzle 8. The paint pipe 4 is used to transport the internal coating paint. The material of the paint pipe typically needs to have good corrosion resistance and wear resistance to adapt to different types of paint. The first paint pipe fixing bracket 3 and the second paint pipe fixing bracket 5 securely install the paint pipe 4 on the pneumatic motor 6, preventing the paint pipe 4 from loosening or shifting due to vibration during spraying, thereby ensuring the stability of paint transport.

[0029] The pneumatic motor 6 adopts a low-noise, high-speed pneumatic grinder, with an idle speed of 65,000 r / min.

[0030] The rotating nozzle 8 is connected to the rotating nozzle fixing shaft 7 via a fastening screw 9. The rotating nozzle fixing shaft 7 and the fastening screw 9 fix the rotating nozzle 8 to the output end of the pneumatic motor 6. Through the fixing action of the rotating nozzle fixing shaft 7 and the fastening screw 9, a tight connection between the rotating nozzle 8 and the pneumatic motor 6 is ensured, enabling the rotational kinetic energy of the pneumatic motor 6 to be efficiently transferred to the rotating nozzle 8.

[0031] The rotary nozzle 8 is a key component of the spraying device, responsible for atomizing and uniformly spraying the inner coating paint onto the object surface. A cross-sectional view of the rotary nozzle 8 is shown below. Figure 3 As shown in (3a), the rotary nozzle 8 is cylindrical with a hollow bottom, and the front end of the paint tube 4 extends into the bottom of the rotary nozzle 8. Figure 3 As shown in (3b), the outer surface of the rotary nozzle 8 is provided with uniformly distributed spiral spray holes. Through the centrifugal force generated by high-speed rotation and the shearing action of the airflow, the paint is dispersed into fine droplets, thus achieving uniform spraying. When the pneumatic motor 6 drives the rotary nozzle 8 to rotate, the paint enters the nozzle through the paint pipeline. Under the combined action of the high-speed rotation of the nozzle and the airflow, the paint is atomized into fine particles and uniformly sprayed onto the object surface. This atomization method can improve the adhesion and spraying efficiency of the paint while reducing paint waste.

[0032] The working principle of the steel pipe internal coating spraying device proposed in this utility model is as follows:

[0033] Compressed air enters the pneumatic motor 6, driving its rotor to rotate. The rotational kinetic energy of the pneumatic motor 6 is transmitted to the rotating nozzle 8 via the rotating nozzle fixing shaft 7 and fastening screws 9, causing it to rotate at high speed. The inner coating paint is delivered to the rotating nozzle 8 through the paint pipe 4. Under the high-speed rotation of the rotating nozzle 8 and the shearing action of the airflow, the paint is atomized into fine particles and evenly sprayed onto the object surface. By adjusting the rotation speed of the pneumatic motor 6 and the paint delivery rate, the thickness and uniformity of the coating can be controlled. This spraying method is suitable for surfaces of various complex shapes and can achieve high-quality coating coverage. Therefore, the steel pipe inner coating spraying device proposed in this utility model, due to the high rotation speed of the pneumatic motor, has a large atomization range and good atomization effect, fully ensuring the atomization distance of the paint, and can spray steel pipes with an inner diameter of φ40mm to φ400mm.

[0034] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A steel pipe inner coating spraying device characterized by comprising: It comprises a pneumatic motor driving seat (1), a valve core (2), a paint pipe (4), a pneumatic motor (6), a rotary spray head fixing shaft (7) and a rotary spray head (8), the pneumatic motor driving seat (1) is connected with the pneumatic motor (6) through the valve core (2); the paint pipe (4) is connected with the pneumatic motor driving seat (1); the rotary spray head (8) is connected with the pneumatic motor (6) through the rotary spray head fixing shaft (7). It also comprises a first paint pipe fixing frame (3) and a second paint pipe fixing frame (5), which are arranged outside the pneumatic motor (6), and the paint pipe (4) is fixed on the first paint pipe fixing frame (3) and the second paint pipe fixing frame (5).

2. The steel pipe internal coating spraying apparatus according to claim 1, characterized by The front end of the paint pipe (4) is inwardly curved, and the front end of the paint pipe (4) extends into the rotary spray head (8).

3. The steel pipe internal coating spraying apparatus according to claim 2, characterized by The pneumatic motor driving seat (1) is provided with an inclined outward channel (11), and the center of the pneumatic motor driving seat (1) is provided with a center hole, one end of which is connected with the external paint pipe line, and the other end is connected with the paint pipe (4) through the inclined outward channel (11).

4. The steel pipe internal coating spraying apparatus according to claim 1, characterized by A plurality of air channels (12) are symmetrically arranged on the left and right sides of the center hole, one end of the air channel (12) is connected with the external compressed air pipe line, and the other end is connected with the valve core (2).

5. The steel pipe internal coating spraying apparatus according to claim 4, characterized by The pneumatic motor driving seat (1) is provided with a threaded hole (13) at the lower edge of the air channel (12) connected with the external compressed air pipe line.

6. The steel pipe internal coating spraying apparatus according to claim 5, characterized by The end of the threaded hole (13) is trumpet-shaped.

7. The steel pipe internal coating spraying apparatus according to claim 6, characterized by The rotary spray head (8) is connected with the rotary spray head fixing shaft (7) through a fastening screw (9).

8. The steel pipe internal coating spraying apparatus according to claim 1, characterized by The outer surface of the rotary spray head (8) is provided with uniformly distributed spiral spray holes.

9. The steel pipe internal coating spraying apparatus according to claim 1, characterized by The pneumatic motor (6) is a pneumatic air grinder, and the no-load speed of the pneumatic air grinder is 65000r / min.

10. The steel pipe internal coating spraying apparatus according to claim 1, characterized by ​

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