Automatic internal coating device for pipe fittings

Abstract

The present invention relates to the technical field of internal coating of pipe fittings, and in particular to an automatic internal coating device for pipe fittings. It comprises: a paint powder box, a powder spraying device, a recovery port, and a placement platform; the placement platform is used to place pipe fittings; the paint powder box is used to provide paint powder to the powder spraying device; the powder spraying device is used to spray paint powder into the inside of the pipe fittings; the recovery port runs through the placement platform, the recovery port is connected to the paint powder box, and the air pressure at the recovery port is negative pressure compared to the ambient air pressure. In the prior art, although the inner wall of the pipe fitting can be effectively coated, the excess paint powder is recovered by dumping, which is easy to cause paint powder residue and uneven thickness of the paint layer. Compared with the prior art, the present invention attracts the paint powder by the negative pressure of the recovery port, so that the paint powder that is not attached to the inner wall of the pipe fitting is recovered into the paint powder box. Therefore, the present invention can fully recover the paint powder and is not easy to cause paint powder residue.

Description

Technical Field

[0001] The invention relates to the technical field of internal coating of pipe fittings, and in particular to an automatic internal coating device for pipe fittings. Background Art

[0002] Pipe fittings are components in pipeline systems that play the role of connection, control, direction change, flow diversion, sealing, support, etc. In order to increase the service life of pipe fittings, it is usually necessary to perform special treatments such as anti-corrosion and anti-rust on the inner wall of the pipe fittings. In the prior art, a layer of anti-corrosion and anti-rust protective layer is usually added to the inner wall of the pipe fittings by plastic coating to achieve the purpose of increasing the service life of the pipe fittings.

[0003] A Chinese patent discloses a large-diameter grooved pipe internal plastic coating device [application number: CN201720480233.5, publication number: CN206716393U] comprising: a discharge box, a bracket and a cover plate. The discharge box is arranged above the upper port of the grooved pipe, and the cover plate covers the lower port of the grooved pipe. The bracket comprises a first support plate and a second support plate. The first support plate is supported at the lower port of the grooved pipe so that the lower port of the grooved pipe faces a horizontal direction, and the second support plate is supported at the upper port of the grooved pipe so that the upper port of the grooved pipe is in a vertical upward direction. The first support plate is perpendicular to the tangent direction of the arc of the grooved pipe at its lower port, and the second support plate points to the center of the arc of the grooved pipe. The cover plate is connected to a translation component, and the translation component pushes the cover plate to move to control the opening or closing of the lower port of the grooved pipe. Although the technical solution of this patent can effectively coat the inner wall of the pipe, the excess paint powder is recycled by dumping. This recycling method is prone to insufficient dumping, resulting in excess paint powder remaining on the inner wall of the pipe, causing uneven thickness of the plastic coating layer of the pipe. Summary of the invention

[0004] In view of the technical problems of the prior art, the present invention provides an automatic internal coating device for pipe fittings.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] An automatic internal coating transposition device for pipe fittings comprises: a paint powder box, a powder spraying device, a recovery port, and a placement platform; the placement platform is used to place the pipe fittings; the paint powder box is used to provide paint powder to the powder spraying device; the powder spraying device is used to spray paint powder into the inside of the pipe fittings; the recovery port runs through the placement platform, the recovery port is connected to the paint powder box, and the air pressure at the recovery port is negative pressure compared to the ambient air pressure.

[0007] In actual application, the staff will place the pipe fittings on the placement platform and manually adjust the position of the pipe fittings so that the opening on the pipe fittings is aligned with the recovery opening on the one hand, and the opening on the pipe fittings is aligned with the powder spraying device on the other hand. Taking the straight-through pipe fittings as an example, when the staff places the straight-through pipe fittings on the placement platform, by adjusting the position of the straight-through pipe fittings, one opening of the straight-through pipe fittings is aligned with the recovery opening, and the other opening is aligned with the powder spraying device. The powder spraying device is started, and the powder spraying device sprays paint powder into the interior of the pipe fittings so that the paint powder adheres to the inner wall of the pipe fittings. As the spraying time increases, the paint powder will gradually form a paint layer on the inner wall of the pipe fittings. Since the air pressure at the recovery opening is negative pressure, affected by the atmospheric pressure, while the powder spraying device sprays paint powder, the paint powder dispersed inside the pipe fitting will be sucked into the recovery opening, and discharged into the paint powder box through the recovery opening, and finally sprayed out again by the powder spraying device. In this way, the recycling of paint powder is completed. There are various ways to generate negative pressure at the recovery port, for example, the recovery port can be connected to an exhaust device, so that negative pressure is generated at the recovery port through the exhaust device. In summary, the present invention recycles and reuses paint powder through the adsorption effect of the recovery port on paint powder, thereby effectively avoiding paint powder residue caused by the recycling method of dumping, and further effectively avoiding uneven paint surface thickness caused by paint powder residue.

[0008] Furthermore, a recovery pipe is provided between the recovery port and the paint powder box, and the recovery port is connected to the paint powder box through the recovery pipe.

[0009] Furthermore, a limit block is arranged on the recovery port, and a slide rail is arranged between the limit block and the placement platform so that the limit block can move relative to the placement platform.

[0010] Furthermore, the limit block is in a truncated cone shape, and the wider end of the limit block is connected to the recovery port.

[0011] Furthermore, the powder spraying device comprises: a powder spraying head and a powder supply pipeline; the powder spraying head is connected to the paint powder box through the powder supply pipeline.

[0012] Furthermore, the powder spraying device also includes a rotating gear and a power motor; the rotating gear is arranged between the powder spraying head and the powder supply pipeline; the rotating gear is transmission-connected to the power motor.

[0013] Furthermore, the powder spraying device also includes: a sliding platform, an auxiliary slide rail; a rotating gear rotatably connected to the sliding platform; a powder supply pipeline is fixedly connected to the sliding platform; an end of the sliding platform away from the powder spraying head is slidably connected to the auxiliary slide rail; and the sliding platform is transmission-connected to the auxiliary cylinder arranged on the auxiliary slide rail.

[0014] Furthermore, the powder spraying device also includes an adjusting slide rail and an adjusting motor; a connecting plate is slidably provided on the adjusting slide rail; the auxiliary slide rail is fixedly connected to the connecting plate; and the connecting plate is drivingly connected to the adjusting motor.

[0015] Furthermore, the number of the powder spraying devices is one or more; when the number of the powder spraying devices is multiple, an angle is set between the powder spraying directions of the powder spraying devices.

[0016] Furthermore, it also includes a material unloading device; the material unloading device includes a material unloading cylinder and a push head; the material unloading cylinder is transmission-connected to the push head; the material unloading cylinder is arranged on one side of the placement platform.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The negative pressure generated at the recovery port is used to absorb and recover the paint powder, which effectively reduces the paint powder residue caused by the dumping recovery method, thereby making the generated paint surface more uniform.

[0019] The negative pressure generated at the recovery port can be used to effectively guide the movement direction of the paint powder. On the one hand, it allows the paint powder to adhere to the inner wall of the pipe more quickly, improving processing efficiency. On the other hand, it further makes the paint surface more uniform.

[0020] The device uses the adsorption effect of the recovery port to enable recovery and reuse to be carried out simultaneously, thereby further improving the working efficiency of the device.

[0021] A plurality of powder spraying devices are provided, and the spraying directions of the powder spraying devices are provided with an angle, so that the device can fully adapt to three-way pipe fittings, elbow pipe fittings, and straight pipe fittings.

[0022] The powder spraying device is provided with two parallel sliding tracks, thereby decomposing the movement process of the powder spraying head into two stages. On the one hand, the length of a single track can be effectively shortened, thereby making the device more compact, and on the other hand, it is convenient to control the movement speed of the powder spraying head, so that the device can make the powder spraying head extend into the pipe faster under the premise of protecting the powder spraying head.

[0023] By turning the gear, the powder spraying head can rotate while spraying powder, so that the paint powder sprayed by the powder spraying head can be more easily diffused by utilizing the centrifugal effect, which can further improve the efficiency of paint surface generation on the one hand, and make the generated paint surface more uniform on the other hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 : Overall structure diagram.

[0025] Figure 2 : Front view.

[0026] Figure 3 : Structural diagram of powder spraying device.

[0027] In the figure: 1-powder spraying device, 11-powder spraying head, 12-powder supply pipeline, 13-sliding platform, 14-auxiliary slide rail, 141-auxiliary cylinder, 15-rotating gear, 16-power motor, 17-adjusting slide rail, 171-connecting plate, 1711-slider, 18-adjusting motor, 2-recovery port, 21-recovery pipeline, 22-limiting block, 3-placing platform, 31-limiting plate, 4-unloading device, 41-unloading cylinder, 42-pushing head. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] An automatic internal coating device for pipe fittings comprises: a paint powder box, a powder spraying device 1, a recovery port 2, and a placement platform 3. The placement platform 3 is arranged parallel to the horizontal plane, and a port is provided on the placement platform 3, and the diameter of the port corresponds to the recovery port 2. A limit plate 31 is also provided on the placement platform 3, and the limit plate 31 is arranged on one end of the placement platform 3 close to the powder spraying device 1, and the limit plate 31 is arranged perpendicular to the placement platform 3, and a circular arc limit groove is provided on the limit plate 31.

[0030] The recovery port 2 is connected to the paint powder box, and the position of the recovery port 2 corresponds to the position of the port on the placement platform 3. The air pressure at the recovery port 2 is negative pressure compared to the ambient air pressure. There are various ways to make the air pressure at the recovery port 2 negative pressure, for example: connecting the recovery port 2 with an exhaust device, so that the air pressure at the recovery port 2 is negative pressure through the exhaust device. A truncated cone-shaped limit block 21 is provided on the recovery port 2, and the limit block 22 is provided with an air flow channel running through the upper and lower surfaces. The wider end of the limit block 22 is connected to the recovery port 2, so that the recovery port 2 is narrowed by the limit block 22, and the negative pressure at the recovery port 2 is further enhanced by the limit block 22. A slide rail is also provided between the limit block 22 and the placement platform 3. The limit block 22 is slidably connected to the slide rail so that the limit block 22 can move in the vertical direction relative to the placement platform 3. When the limit block 22 moves upward in the vertical direction, the limit block 22 passes through the opening on the placement platform 3 and protrudes from the placement platform 3. When the limit block 22 moves downward in the vertical direction, the upper surface of the limit block 22 is flush with the placement platform 3. There are various ways to make the limit block 22 move. For example, a cylinder can be provided and the cylinder is connected to the limit block 22 in a transmission manner, so that the limit block 22 is driven to move by the cylinder. It is worth noting that during the movement of the limit block 22, it always maintains a connected state with the recovery port 2.

[0031] The number of the powder spraying devices 1 is one or more. When the number of the powder spraying devices 1 is more than one, an angle is set between the powder spraying directions of the powder spraying devices 1. Preferably, the number of the powder spraying devices 1 is two, and the angle between the powder spraying directions of the two powder spraying devices 1 is 90°. Thus, the device can adapt to elbow connectors, three-way connectors, and straight connectors, thereby widening the scope of use of the device. The powder spraying device 1 includes a powder spraying head 11 and a powder supply pipe 12. The powder spraying head 11 is connected to the paint powder box through the powder supply pipe 12, so as to receive the paint powder provided by the paint powder box. The powder spraying device 1 also includes a sliding platform 13 and an auxiliary slide rail 14. The powder spraying head 11 and the powder supply pipe 12 are arranged at one end of the sliding platform 13, and the end of the sliding platform 13 away from the powder spraying head 11 is slidably connected to the auxiliary slide rail 14. The sliding platform 13 is transmission-connected to the auxiliary cylinder 141 arranged on the auxiliary slide rail 14. When the auxiliary cylinder 141 is actuated, the sliding platform 13 can be driven to slide along the auxiliary slide rail 14, thereby causing the powder spraying head 11 and the powder supply pipe 12 to slide along the auxiliary slide rail 14. The powder spraying device 1 also includes an adjusting slide rail 17 and an adjusting motor 18. A connecting plate 171 is provided on the adjusting slide rail 17, and a slider 1711 is provided on one side of the connecting plate 171. The adjusting slide rail 17 passes through the slider 1711, so that the connecting plate 171 can slide along the adjusting slide rail 17. The other side of the connecting plate 171 is fixedly connected to the auxiliary slide rail 17, and the connecting plate 171 is transmission-connected to the adjusting motor 18, so that when the adjusting motor 18 is actuated, the connecting plate 171 can be driven to slide along the adjusting slide rail 17, thereby causing the auxiliary slide rail 14 to slide along the adjusting slide rail 17.

[0032] The device further comprises a material unloading device 4, which comprises a material unloading cylinder 41 and a push head 42. The material unloading cylinder 41 is in transmission connection with the push head 42, and the material unloading cylinder 41 is arranged on one side of the placement platform 3.

[0033] In practical application, take the elbow pipe fitting as an example. Start the device, at this time, the cylinder connected to the limit block 22 is actuated, thereby pushing the limit block 22 to move, so that the limit block 22 protrudes outside the placement platform 3. Place a through opening in the elbow pipe fitting on the placement platform 3, at this time the limit block 22 extends into the cavity of the elbow pipe fitting, so that the elbow pipe fitting is limited by the limit block 22. At the same time, the other through opening of the elbow pipe fitting is embedded in the arc-shaped limit groove of the limit plate 31. On the one hand, the elbow pipe fitting is further limited by the limit plate, and on the other hand, the through opening of the elbow pipe fitting can be aligned with the powder spraying head 11 of the powder spraying device 1. After the elbow pipe fitting is placed. Start the powder spraying device 1. At this time, the adjusting motor 18 pushes the connecting plate 171, so that the connecting plate 171 moves along the adjusting slide rail 7 toward the direction close to the elbow pipe fitting, thereby driving the auxiliary slide rail 14 and the auxiliary cylinder 141 disposed on the auxiliary slide rail 14 to slide along the adjusting slide rail 17, and then driving the sliding platform 13 and the powder spraying head 11 and the powder supply pipe 12 disposed on the sliding platform 13 to move together. Start the auxiliary cylinder 141, thereby pushing the sliding platform 13 to move further along the auxiliary slide rail 14 toward the direction close to the elbow pipe fitting, and then driving the powder spraying head 11 and the powder supply pipe 12 to move further toward the direction close to the elbow pipe fitting through the sliding platform 13. Finally, the powder spraying head 11 is embedded in the opening of the limit plate 31 through the elbow pipe fitting and extends into the cavity of the elbow pipe fitting. In summary, the present invention divides the movement process of the powder spray head 11 into two ends by setting slide rails parallel to each other at both ends. On the one hand, the length of a single track can be effectively reduced, thereby making the device more compact. On the other hand, it is convenient to control the movement speed of the powder spray head 11. For example, the output of the regulating motor 18 can be adjusted to a higher range, so that the powder spray head 11 can move toward the pipe more quickly, and the output of the auxiliary cylinder 141 can be adjusted to a lower range, so that the powder spray head 11 will not impact the pipe when it is inserted into the pipe, so as to protect the powder spray head 11. As a result, the powder spray device can approach the pipe more quickly under the premise of protecting the powder spray head 11.

[0034] After the powder spray head 11 is inserted into the cavity of the elbow pipe fitting, negative pressure is generated at the recovery port 2 while the powder spray head 11 is started. At this time, the powder spray head 11 sprays paint powder into the cavity of the elbow pipe fitting, so that the paint powder is dispersed in the cavity of the elbow pipe fitting, and the paint powder at the junction with the inner wall of the elbow pipe fitting will adhere to the inner wall of the elbow pipe fitting to form a paint surface. At the same time, the recovery port 2 absorbs the paint powder that fails to adhere to the inner wall through the air flow channel of the limit block 22. Finally, the adsorbed paint powder will enter the paint powder box through the recovery pipe 21, and will be provided to the powder spray head 11 again through the paint powder box. In summary, the present invention recycles paint powder through the adsorption effect of the hand guard port 2. On the one hand, the device recycles paint powder more fully, thereby effectively avoiding uneven thickness of the paint surface caused by residual paint powder. On the other hand, the adsorption effect of the recovery port 2 can effectively guide the movement direction of the paint powder, so that the paint powder is easier to fit with the inner wall of the pipe, thereby forming a complete paint surface more quickly and accelerating the processing efficiency. At the same time, the device recycles and reuses paint powder simultaneously, thereby further improving the processing efficiency of the device.

[0035] After the powder spray head 11 sprays for a fixed time, the powder spray head 11 is stopped, and the cylinder connected to the limit block 22 is controlled to move in the reverse direction, so that the upper surface of the limit block 22 is flush with the surface of the placement platform 3. At the same time, the regulating motor 18 and the auxiliary cylinder 141 are controlled to move in the reverse direction in sequence, so that the powder spray head 11 is separated from the cavity of the pipe fitting. At this time, the unloading cylinder 41 is started, so that the unloading cylinder 41 drives the push head 42 to move, thereby pushing the pipe fitting through the push head 42, so that the pipe fitting is separated from the placement platform 3 and finally falls into the storage box arranged next to the placement platform 3. It is worth noting that the spraying time of the powder spray head 11 can be obtained through preliminary experiments, so that the paint powder can fully form a paint surface in the pipe fitting.

[0036] The powder spraying device 1 further includes a rotating gear 15 and a power motor 16. The rotating gear 15 is disposed between the powder spraying head 11 and the powder supply pipe 12, and the rotating gear 15 is rotatably connected to the sliding platform 13, one side of the rotating gear 15 is in contact with the sliding platform 13, and the other side of the rotating gear 15 is connected to the powder spraying head 11. The rotating gear 15 and the power motor 16 can be connected via a belt drive.

[0037] When the powder spray head 11 is started to spray paint powder, the power motor 16 is started so that the power motor 16 drives the powder spray head 11 to rotate by rotating the gear 15, thereby utilizing the centrifugal effect to make the paint powder sprayed by the powder spray head 11 easier to diffuse, which can generate the paint surface faster on the one hand and make the generated paint surface more uniform on the other hand.

[0038] In practical application, a plurality of processing stations can be set up, and each station is provided with a set of the above-mentioned device.

[0039] It is worth noting that in order to complete the above process, it is necessary to control the actions of each component and the order of the actions, and there are various control methods. For example: the action duration and order of each component can be controlled by manually pressing a button, or it can be controlled by the system. For example: when controlling the spraying duration of the powder spray head 11, the system can pre-store the theoretical duration. When the powder spray head 11 starts spraying powder, the system starts timing to obtain the actual duration. The system compares the actual duration with the theoretical duration. When the actual duration is equal to the theoretical duration, the system controls the powder spray head 11 to stop working. In summary, the present device is practically implementable, and the specific control method is a prior art, which will not be repeated here.

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An automatic internal coating device for pipe fittings, characterized in that: include: Paint powder box, powder spraying device (1), recovery port (2), placement platform (3); The placement platform (3) is used to place pipe fittings; The paint powder box is used to provide paint powder to the powder spraying device (1); The powder spraying device (1) is used to spray the paint powder into the interior of the pipe; The recovery port (2) passes through the placement platform (3), the recovery port (2) is in communication with the paint powder box, and the air pressure at the recovery port (2) is negative pressure compared to the ambient air pressure; A recovery pipe (21) is provided between the recovery port (2) and the paint powder box, and the recovery port (2) is connected to the paint powder box through the recovery pipe (21); A limit block (22) is provided on the recovery port (2), and a slide rail is provided between the limit block (22) and the placement platform (3), so that the limit block (22) can move relative to the placement platform (3); The limit block (22) is in the shape of a truncated cone, and the wider end of the limit block (22) is in communication with the recovery port (2). The recovery port (2) is narrowed by the limit block (22), and the negative pressure at the recovery port (2) is further enhanced by the limit block (22); Before powder spraying, the cylinder connected to the limit block (22) pushes the limit block (22) to protrude from the placement platform (3) to limit the workpiece; after powder spraying, the cylinder connected to the limit block (22) moves in the opposite direction to make the upper surface of the limit block (22) flush with the surface of the placement platform (3), and the limit block (22) always maintains a connected state with the recovery port (2) during the movement.

2. The automatic internal coating device for pipe fittings according to claim 1, characterized in that: The powder spraying device (1) comprises: a powder spraying head (11) and a powder supply pipeline (12); The powder spray head (11) is connected to the paint powder box via the powder supply pipe (12).

3. The automatic internal coating device for pipe fittings according to claim 2 is characterized in that: The powder spraying device (1) further comprises a rotating gear (15) and a power motor (16); The rotating gear (15) is arranged between the powder spraying head (11) and the powder supply pipe (12); The rotating gear (15) is transmission-connected to the power motor (16).

4. The automatic internal coating device for pipe fittings according to claim 3 is characterized in that: The powder spraying device (1) further comprises: a sliding platform (13) and an auxiliary sliding rail (14); The rotating gear (15) is rotatably connected to the sliding platform (13); The powder supply pipeline (12) is fixedly connected to the sliding platform (13); One end of the sliding platform (13) away from the powder spraying head (11) is slidably connected to the auxiliary slide rail (14); The sliding platform (13) is drivingly connected to an auxiliary cylinder (141) arranged on the auxiliary sliding rail (14).

5. The automatic internal coating device for pipe fittings according to claim 4 is characterized in that: The powder spraying device (1) further comprises an adjusting slide rail (17) and an adjusting motor (18); A connecting plate (171) is slidably provided on the adjusting slide rail (17); The auxiliary slide rail (14) is fixedly connected to the connecting plate (171); The connecting plate (171) is drivingly connected to the regulating motor (18).

6. The automatic internal coating device for pipes according to any one of claims 2 to 5, characterized in that: The number of the powder spraying device (1) is one or more; When there are multiple powder spraying devices (1), an angle is set between the spraying directions of the powder spraying devices (1).

7. The automatic internal coating device for pipe fittings according to claim 1, characterized in that: It also includes a feeding device (4); The material unloading device (4) comprises a material unloading cylinder (41) and a pusher head (42); The unloading cylinder (41) is drivingly connected to the pushing head (42); The unloading cylinder (41) is arranged on one side of the placement platform (3).

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