Feeding conveying device for pipe fitting powder spraying and using method

Abstract

The invention discloses a feeding conveying device for pipe fitting powder spraying and a using method, and belongs to the technical field of pipe fitting powder spraying. A feeding conveying device for pipe fitting powder spraying comprises a rack and further comprises a feeding plate, the feeding plate is obliquely arranged on the rack and used for stacking pipe bodies to be subjected to powder spraying, and the lower end of the feeding plate is provided with a blocking base movably abutting against the pipe bodies; the separating assembly is arranged on the feeding plate and used for separating the pipe bodies stacked on the feeding plate; the feeding assembly is arranged at the tail end of the feeding plate and used for conveying a pipe body to be sprayed with powder to the spraying gun; the transferring assembly is arranged at the tail end of the feeding plate and used for transferring the first pipe body at the tail end of the feeding plate to the feeding assembly. Through dynamic separation, gear synchronous transmission and spiral driving rotation, efficient, accurate and reliable operation of the pipe fitting powder spraying and feeding process is achieved, and an advanced automatic solution is provided for the surface treatment industry.

Description

Technical Field

[0001] This invention relates to the field of powder coating technology for pipe fittings, and in particular to a feeding and conveying device and its usage method for powder coating of pipe fittings. Background Technology

[0002] Powder coating technology for pipe fittings, as an important component of modern surface treatment processes, originated from the development of electrostatic spraying technology in the 1950s. With the increasing demands for corrosion resistance, wear resistance, and aesthetics in industrial manufacturing, this technology has been widely applied in pipe manufacturing, architectural hardware, and automotive parts. Compared with traditional liquid spraying, powder coating has advantages such as environmental friendliness (no solvent evaporation), high material utilization (up to 95% or more), and superior coating performance.

[0003] When feeding existing pipe fittings for powder coating, the fittings are generally handled gently to avoid collisions and damage, resulting in low work efficiency. When the lifting equipment lifts and transports the first fitting on the inclined plate to the powder coating area, the remaining fittings slide down the inclined plate automatically under gravity until the end of the inclined plate. During this process, multiple fittings are prone to collisions and damage, which not only affects the powder coating quality but also reduces the yield of finished fittings. At the same time, it is difficult to adapt to the rapid switching of production for pipes of different diameters, and adjusting or replacing parts is time-consuming. Furthermore, the pipe feeding processes are carried out independently, making it difficult to match the cycle time of automated powder coating equipment. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art, and to propose a feeding and conveying device and its usage method for powder spraying of pipe fittings.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A feeding and conveying device for powder coating of pipe fittings includes a frame and further includes: The feeding plate is inclinedly mounted on the frame and is used to stack the tubes to be sprayed with powder. The lower end of the feeding plate is provided with a stop that moves against the tube. A separator assembly is disposed on a feed plate and is used to separate the tubes stacked on the feed plate; A feeding assembly, which is located at the end of the feeding plate, is used to feed the tube to be sprayed with powder to the spray gun. A transfer assembly is disposed at the end of the feeding plate and is used to transfer the first tube at the end of the feeding plate to the feeding assembly; A gear transmission unit is provided between the feeding component and the transfer component.

[0006] Preferably, the separating component includes a first groove formed on the feeding plate, a plurality of rotating rods rotatably disposed at equal intervals within the first groove, and a plurality of partitions uniformly disposed on the rotating rods in a circular pattern, wherein rubber pads are provided on both the partitions and the stop.

[0007] Preferably, the feeding assembly includes a support plate fixed to the end of the feeding plate, two conveying shafts rotatably connected to the support plate, and conveying rollers disposed on each conveying shaft. The tube body is placed between the two conveying rollers, and the conveying rollers are provided with spiral conveying strips for driving the tube body to rotate.

[0008] Preferably, the transfer assembly includes a fixed plate fixed to the end of the loading plate, two rotating rods rotatably connected to the fixed plate, an eccentric plate disposed on the rotating rods, a swing plate movably connected to the two eccentric plates, and a support disposed on the swing plate. The top of the support movably abuts against the tube body, and the fixed plate is provided with a drive motor for driving one of the rotating rods to rotate.

[0009] Preferably, each of the two rotating rods is provided with an eccentric ring at its end, and a connecting rod is fixed between the two eccentric rings.

[0010] Preferably, the gear transmission unit includes a driving gear and a driven gear meshing with the driving gear. The driving gear is fixedly connected to one of the rotating rods, and the driven gear is fixedly connected to one of the conveying shafts.

[0011] Preferably, the feeding plate is provided with a conveying assembly for maintaining the lateral downward movement of the tube body. The conveying assembly includes support plates fixed on the upper and lower sides of the feeding plate, a rotating shaft rotatably connected to the upper and lower support plates, sprockets on the two rotating shafts, a chain between the two sprockets, and several baffles fixed at equal intervals on the chain. The feeding plate is provided with a second groove for the movement of the baffles.

[0012] Preferably, both the rotating shaft and the rotating rod are provided with synchronous pulleys, and a synchronous belt is provided between the two synchronous pulleys.

[0013] Preferably, the baffle plate includes a base fixed on the chain and a baffle plate rotatably connected to the base via a pin, wherein a torsion spring is provided on the pin for driving the baffle plate to return to its original rotation.

[0014] The present invention also discloses a method of using a feeding and conveying device for powder coating of pipe fittings, comprising the following steps: S1: Tube stacker initialization: Place the tube to be sprayed horizontally on the high end of the loading plate. The tube slides down the inclined surface under its own weight until it comes into contact with the baffle plate. The baffle plate is kept vertical by a torsion spring, which restricts the placement of the tube and ensures that it slides down horizontally. S2: Dynamic separation to prevent stacking: As the tube slides down, it pushes the partition to deflect around the rotating rod; When the first tube comes into contact with the stop, the subsequent tube pushes the next partition to deflect until it comes into contact with the previous tube, thus achieving automatic equidistant separation and avoiding collision and blockage. S3: Step-by-step conveyor to the end: When the drive motor starts, the rotating rod drives the rotating shaft to rotate through the synchronous pulley and synchronous belt. The sprocket drives the chain to move, and the baffle plate fixed to the chain assists the tube body to move downward step by step. If there are already stacked tubes in the path of the baffle, the baffle will be squeezed and deflected around the pin to avoid the tubes and then reset by the torsion spring to avoid hard interference. S4: Transfer and feeding linkage: The rotating rod rotates under the action of the drive motor, and the eccentric plate pushes the swing plate to swing, so that the support lifts the first tube at the end of the feeding plate; The rotating rod drives the driven gear through the driving gear, so that the conveyor shaft rotates synchronously; The tube is lifted between two conveyor rollers, and the spiral conveyor bar contacts the tube, driving it to rotate and move axially to the spray gun station. S5: Rotary spraying operation: The tube rotates at a constant speed under the drive of the conveyor rollers, and the spray gun sprays powder to cover its outer wall completely. The pitch of the spiral conveyor bar controls the axial conveying speed to ensure uniform spraying.

[0015] As can be seen from the above technical solutions, the present invention has the following beneficial effects: 1. In this invention, by setting up a separating component, the tube body is accurately positioned and separated, ensuring that each tube body is placed independently. This solves the problem of surface damage caused by tube bodies colliding with each other in traditional devices, reduces the damage rate, and eliminates the need for workers to handle the tube bodies with care, thus ensuring the quality and efficiency of tube body production and processing. 2. In this invention, by setting up a conveying component to assist in the lowering of the tube, the tube is lowered horizontally on the inclined surface of the loading plate, avoiding the tube from tilting downwards and ensuring that the tube is stacked stably. This ensures the accurate transfer of the tube by the subsequent transfer component and the orderly progress of the tube loading work. 3. In this invention, by integrating the transfer component, the feeding component and the conveying component, a fully automated tube feeding-conveying process is realized, reducing manual intervention, reducing the transfer time of the tube between the powder coating feeding processes, effectively improving the tube powder coating efficiency, and meeting the automation requirements of tube powder coating. 4. In this invention, the baffle is rotatably connected to the base. If there is a tube in the path of the baffle, the baffle is squeezed and deflected around the pin shaft. After avoiding the tube, it is reset by the torsion spring, thus avoiding hard interference and ensuring the normal operation of the conveying component. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the transfer component of the present invention; Figure 4 This is a schematic diagram of the structure of the separator component of the present invention; Figure 5 This is a schematic diagram of the structure of the tube body of the present invention when it is divided; Figure 6 This is a schematic diagram of the external structure of the rotating rod of the present invention; Figure 7 This is a schematic diagram of the external structure of the fixing plate of the present invention. Figure 1 ; Figure 8 This is a schematic diagram of the external structure of the fixing plate of the present invention. Figure 2 ; Figure 9 For the present invention Figure 8 Enlarged structural diagram of section A in the middle; Figure 10 This is a schematic diagram of the structure of the baffle of the present invention when it flips over; Figure 11 This is a partial structural schematic diagram of the conveying assembly of the present invention.

[0017] In the diagram: 1. Frame; 2. Feeding plate; 3. Pipe body; 4. Stop; 5. First groove; 501. Rotating rod; 502. Partition plate; 6. Rubber pad; 7. Support plate; 701. Conveying shaft; 702. Conveying roller; 7021. Spiral conveyor strip; 8. Fixed plate; 801. Rotating rod; 802. Eccentric plate; 803. Swinging plate; 804. Support; 805. Drive motor; 9. Eccentric ring; 901. Connecting rod; 10. Drive gear; 1001. Driven gear; 11. Support plate; 111. Rotating shaft; 112. Sprocket; 113. Chain; 114. Stop plate; 1141. Base; 1142. Baffle plate; 12. Second groove; 13. Synchronous pulley. Detailed Implementation

[0018] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions: Reference Figures 1 to 6As shown, this embodiment proposes a feeding and conveying device for powder coating of pipe fittings, including a frame 1, and further including: a feeding plate 2, a separating component, a feeding component, and a transfer component; the feeding plate 2 is inclinedly disposed on the frame 1 for stacking pipes 3 to be powder coated, the inclination angle allowing the pipes 3 to slide towards the lower end by gravity, and a stop 4 is provided at the lower end of the feeding plate 2 to abut against the pipes 3, the stop 4 being provided with elastic rubber to abut against the outer wall of the pipes 3 to buffer the sliding collision of the pipes 3; the separating component is disposed on the feeding plate 2 for separating the pipes stacked on the feeding plate 2. Body 3, the separating component includes a first groove 5 opened on the feeding plate 2, a plurality of rotating rods 501 equidistantly rotatably arranged in the first groove 5, and a plurality of partitions 502 evenly arranged in a circle on the rotating rods 501, and rubber pads 6 are provided on the partitions 502 and the stop seat 4; the feeding component is located at the end of the feeding plate 2 and is used to convey the tube body 3 to be sprayed to the spray gun station; the transfer component is located at the end of the feeding plate 2 and is used to transfer the first tube body 3 at the end of the feeding plate 2 to the feeding component; wherein, a gear transmission part is provided between the feeding component and the transfer component; Specifically, the tube 3 is horizontally stacked on the high end of the feeding plate 2 and slides down to the stop 4 by gravity. During the descent, the tube 3 pushes the partition 502 to deflect around the rotating rod 501. Then, another tube 3 slides down and pushes the partition 502 to abut against the previous tube 3, realizing automatic separation of adjacent tubes 3. This ensures that only a single tube 3 is in the transfer position at the end of the feeding plate 2, and each tube 3 is placed independently. This solves the problem of surface damage caused by the collision of stacked tubes 3 in traditional devices, reduces the damage rate, and eliminates the need for workers to handle the tubes gently, ensuring the production quality and efficiency of the tubes 3. The transfer component transfers the first tube 3 at the end of the feeding plate 2 to the feeding component. The feeding component moves with the transfer component under the action of the gear transmission part, moving the transferred tube 3 to the spray gun station for powder spraying, ensuring the orderly progress of the tube 3 feeding work.

[0020] Reference Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 8As shown, in a preferred embodiment, based on the above method, the feeding assembly further includes a support plate 7 fixed to the end of the feeding plate 2, two conveying shafts 701 rotatably connected to the support plate 7, and a conveying roller 702 disposed on each conveying shaft 701. The support plate 7 is fixed to the end of the feeding plate 2 and serves as the mounting base for the conveying shafts 701. Its material is usually high-strength steel plate, and it is rigidly connected to the feeding plate 2 by bolts or welding to ensure stability during the conveying process. The tube body 3 is placed between the two conveying rollers 702. The conveying rollers 702 are provided with a spiral conveying strip 7021 for driving the tube body 3 to rotate. The spiral helix angle is usually designed to be 15°–30° to balance the axial conveying force and rotational torque. Through friction transmission, the tube body 3 is simultaneously driven to rotate around its own axis and move laterally along the axial direction to meet the requirements of composite motion. Specifically, the transfer assembly lifts the tube 3 between the two conveying rollers 702. The tube 3 naturally falls into the clamping area and comes into contact with the spiral conveyor bar 7021. The spiral conveyor bar 7021 generates tangential friction with the tube 3, driving the tube 3 to rotate around its axis and conveying it. The tube 3 passes through the powder spraying area under the combined motion of rotation and lateral movement. The spray gun fully covers the outer wall of the uniformly rotating tube 3 with powder coating, avoiding missed spraying or uneven coating, and solving the problem of easy spraying dead corners caused by the traditional roller conveyor only achieving translation of the tube 3.

[0021] Reference Figure 3 , Figure 7 and Figure 8 As shown, in a preferred embodiment, based on the above method, the transfer assembly further includes a fixed plate 8 fixed to the end of the loading plate 2, two rotating rods 801 rotatably connected to the fixed plate 8, an eccentric plate 802 set on the rotating rods 801, a swing plate 803 movably connected to the two eccentric plates 802, and a support 804 set on the swing plate 803. The fixed plate 8 is rigidly fixed to the end of the loading plate 2 by bolts or welding, serving as a support base for the transfer assembly to ensure load-bearing stability. The top of the support 804 movably abuts against the tube 3. The two ends of the swing plate 803 are movably connected to the eccentric plate 802 by hinge pins to form a "double eccentric wheel-single swing rod" mechanism. The surface of the support 804 should be covered with polyurethane rubber to buffer the collision of the tube 3. The fixed plate 8 is provided with a drive motor 805 for driving one of the rotating rods 801 to rotate. Specifically, when the transfer component is working, the drive motor 805 is controlled to run. The drive motor 805 drives the eccentric plate 802 to rotate through the rotating rod 801. The two eccentric plates 802 drive the support 804 to move back and forth through the swing plate 803, so that the support 804 is lifted from the end of the feeding plate 2, and the tube 3 that abuts against the stop 4 is lifted and transferred and lowered between the two conveying rollers 702, so that the conveying rollers 702 convey the material to the tube 3.

[0022] Reference Figure 7and Figure 8 As shown, in a preferred embodiment, based on the above method, each of the two rotating rods 801 is further provided with an eccentric ring 9, and a connecting rod 901 is fixed between the two eccentric rings 9. The arrangement of the two eccentric rings 9 and the connecting rod 901 can help the "double eccentric wheel-single pendulum" overcome dead angles when swinging. In actual use, a synchronous belt pulley can also be used to replace the eccentric rings 9 and the connecting rod 901. By setting a synchronous belt and pulley between the two rotating rods 801, the two rotating rods 801 rotate together to complete the transfer of the support 804 to the tube 3.

[0023] Reference Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 8 As shown, in a preferred embodiment, based on the above method, the gear transmission unit further includes a driving gear 10 and a driven gear 1001 meshing with the driving gear 10. The driving gear 10 is rigidly connected to the end of the rotating rod 801 of the transfer assembly by a key connection or flange fixing to ensure that the two rotate synchronously. The driven gear 1001 is fixedly connected to one of the conveying shafts 701. When the drive motor 805 starts, it drives the rotating rod 801 to rotate, and the driving gear 10 rotates synchronously. The driving gear 10 meshes with and drives the driven gear 1001, and the driven gear 1001 drives the conveying shaft 701 to rotate, which drives the conveying roller 702 to rotate. The spiral conveying strip 7021 pushes the tube body 3 to rotate and move it axially. The gear meshing process strictly maintains a constant transmission ratio to ensure that the conveying roller 702 starts synchronously while the transfer assembly support 804 lifts the tube body 3, realizing zero-delay connection of "lifting and placing and sending" and "lifting after conveying".

[0024] Reference Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, in a preferred embodiment, based on the above method, the feeding plate 2 is further provided with a conveying assembly for maintaining the lateral downward movement of the tube 3. The conveying assembly includes support plates 11 fixed on the upper and lower sides of the feeding plate 2, a rotating shaft 111 rotatably connected to the upper and lower support plates 11, sprockets 112 disposed on the two rotating shafts 111, a chain 113 disposed between the two sprockets 112, and a plurality of baffle plates 114 equidistantly fixed on the chain 113. The feeding plate 2 is provided with a second groove 12 for the movement of the baffle plates 114. Synchronous pulleys 13 are provided on both the rotating shaft 111 and the rotating rod 801, and a synchronous belt is provided between the two synchronous pulleys 13. The upper and lower sides of the feeding plate 2 are symmetrically welded with support plates 11 to form a rigid support frame. The baffle plate 114 passes through the second groove 12 and is higher than the surface of the feeding plate 2. The tube body 3 is placed between the adjacent baffle plates 114. The rotating rod 801 drives the rotating shaft 111 to rotate through the synchronous wheel 13 and the synchronous belt. The chain 113 drives the baffle plate 114 to move at a uniform speed along the feeding plate 2. The tube body 3 slides down at a uniform speed along the inclined direction of the feeding plate 2 with the baffle plate 114. This not only assists the tube body 3 to move down at a uniform speed, but also prevents the tube body 3 from rolling off course when it slides down. This avoids the tube body 3 from being placed crookedly, ensuring that the tube body 3 is stacked stably. This ensures the accurate transfer of the tube body 3 by the subsequent transfer components and ensures the orderly progress of the tube body 3 feeding work.

[0025] Reference Figure 9 and Figure 10 As shown, in a preferred embodiment, based on the above method, the baffle plate 114 further includes a base 1141 fixed on the chain 113 and a baffle 1142 rotatably connected to the base 1141 via a pin. A torsion spring is provided on the pin for driving the baffle 1142 to reset and rotate. The torsion spring is sleeved on the pin, with its two ends respectively inserted into the side wall of the base 1141 and the back of the baffle 1142, ensuring that the baffle 1142 can automatically reset to the initial vertical position after being deflected by an external force. If there are stacked tubes 3 in the movement path of the baffle plate 114, the baffle 1142 is squeezed and deflected around the pin, avoiding the tubes 3 and then reset by the torsion spring, avoiding hard interference. After the baffle 1142 passes the tubes 3, the torsion spring releases torque, pushing the baffle 1142 to automatically reset to the vertical position. Then the baffle plate 114 continues to move down from the high end of the feed plate 2 to assist the subsequent tubes 3 to slide down.

[0026] The present invention also discloses a method of using a feeding and conveying device for powder coating of pipe fittings, comprising the following steps: S1: Tube body 3-stage amplifier initialization: The tube body 3 to be sprayed is placed horizontally at the high end of the loading plate 2. The tube body 3 slides down the inclined surface under its own weight until it comes into contact with the baffle plate 114. The baffle plate 114 is kept vertical by a torsion spring, which restricts the placement of the tube body 3 and ensures that it slides down horizontally. S2: Dynamic separation to prevent stacking: When the tube body 3 slides down, it pushes the partition plate 502 to deflect around the rotating rod 501. If the diameter of the tube body 3 to be sprayed changes, the distance between adjacent rotating rods 501 is adjusted. The feeding plate 2 should be provided with adjustment holes along its inclined surface to adjust the position of the rotating rods 501 so that the distance between the partition plates 502 is equal to the diameter of the tube body 3. When the first tube 3 comes into contact with the stop 4, the subsequent tube 3 pushes the next partition 502 to deflect until it comes into contact with the previous tube 3, thus achieving automatic equidistant separation and avoiding collision and blockage. S3: Step-by-step conveyor to the end: When the drive motor 805 starts, the rotating rod 801 drives the rotating shaft 111 to rotate through the synchronous wheel 13 and the synchronous belt. The sprocket 112 drives the chain 113 to move, and the baffle plate 114 fixed to the chain 113 assists the tube body 3 to move down step by step. If there is a stacked tube 3 in the moving path of the baffle plate 114, the baffle plate 1142 will be squeezed and deflected around the pin shaft, avoiding the tube 3 and then reset by the torsion spring to avoid hard interference. S4: Transfer and feeding linkage: The rotating rod 801 rotates under the action of the drive motor 805, and the eccentric plate 802 pushes the swing plate 803 to swing, so that the support 804 lifts the first tube 3 at the end of the feeding plate 2; The rotating rod 801 drives the driven gear 1001 through the driving gear 10, so that the conveying shaft 701 rotates synchronously; The tube body 3 is lifted between the two conveying rollers 702, and the spiral conveyor bar 7021 contacts the tube body 3, driving it to rotate and axially move it to the spray gun station. S5: Rotary spraying operation: The tube body 3 rotates at a constant speed under the drive of the conveyor roller 702, and the spray gun sprays powder to cover its outer wall. The pitch of the spiral conveyor bar 7021 controls the axial conveying speed to ensure uniform spraying.

[0027] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A feeding and conveying device for powder coating of pipe fittings, comprising a frame (1), characterized in that, Also includes: The feeding plate (2) is inclinedly set on the frame (1) and is used to stack the tubes (3) to be sprayed with powder. The lower end of the feeding plate (2) is provided with a stop (4) that moves against the tubes (3). A separating component is provided on the feeding plate (2) to separate the tubes (3) stacked on the feeding plate (2). The feeding assembly is located at the end of the feeding plate (2) and is used to feed the tube (3) to be sprayed with powder to the spray gun. The transfer component is located at the end of the feeding plate (2) and is used to transfer the first tube (3) at the end of the feeding plate (2) to the feeding component; A gear transmission unit is provided between the feeding component and the transfer component.

2. The feeding and conveying device for powder coating of pipe fittings according to claim 1, characterized in that, The separating component includes a first groove (5) opened on the feeding plate (2), a plurality of rotating rods (501) equidistantly rotatably arranged in the first groove (5), and a plurality of partitions (502) evenly arranged on the rotating rods (501) in a circular pattern. Both the partitions (502) and the stop (4) are provided with rubber pads (6).

3. The feeding and conveying device for powder coating of pipe fittings according to claim 2, characterized in that, The feeding assembly includes a support plate (7) fixed at the end of the feeding plate (2), two conveying shafts (701) rotatably connected to the support plate (7), and a conveying roller (702) provided on each conveying shaft (701). The tube (3) is placed between the two conveying rollers (702), and the conveying roller (702) is provided with a spiral conveying strip (7021) for driving the tube (3) to rotate.

4. The feeding and conveying device for powder coating of pipe fittings according to claim 3, characterized in that, The transfer assembly includes a fixed plate (8) fixed at the end of the loading plate (2), two rotating rods (801) rotatably connected to the fixed plate (8), an eccentric plate (802) set on the rotating rods (801), a swing plate (803) movably connected to the two eccentric plates (802), and a support (804) set on the swing plate (803). The top of the support (804) movably abuts against the tube body (3). The fixed plate (8) is provided with a drive motor (805) for driving one of the rotating rods (801) to rotate.

5. The feeding and conveying device for powder coating of pipe fittings according to claim 4, characterized in that, An eccentric ring (9) is provided at the end of each of the two rotating rods (801), and a connecting rod (901) is fixed between the two eccentric rings (9).

6. The feeding and conveying device for powder coating of pipe fittings according to claim 5, characterized in that, The gear transmission unit includes a driving gear (10) and a driven gear (1001) meshing with the driving gear (10). The driving gear (10) is fixedly connected to one of the rotating rods (801), and the driven gear (1001) is fixedly connected to one of the conveying shafts (701).

7. The feeding and conveying device for powder coating of pipe fittings according to claim 6, characterized in that, The feeding plate (2) is provided with a conveying assembly for keeping the tube (3) moving laterally downward. The conveying assembly includes support plates (11) fixed on the upper and lower sides of the feeding plate (2), a rotating shaft (111) rotatably connected to the upper and lower support plates (11), sprockets (112) on the two rotating shafts (111), a chain (113) between the two sprockets (112), and several baffles (114) fixed at equal intervals on the chain (113). The feeding plate (2) is provided with a second groove (12) for the movement of the baffles (114).

8. The feeding and conveying device for powder coating of pipe fittings according to claim 7, characterized in that, Both the rotating shaft (111) and the rotating rod (801) are provided with synchronous pulleys (13), and a synchronous belt is provided between the two synchronous pulleys (13).

9. A feeding and conveying device for powder coating of pipe fittings according to claim 8, characterized in that, The baffle plate (114) includes a base (1141) fixed on the chain (113) and a baffle (1142) rotatably connected to the base (1141) via a pin. The pin is provided with a torsion spring for driving the baffle (1142) to reset and rotate.

10. A method of using the feeding and conveying device for powder coating of pipe fittings according to claim 9, characterized in that, Includes the following steps: S1: Initialization of tube (3) stacking: The tube body (3) to be sprayed is placed horizontally at the high end of the loading plate (2). The tube body (3) slides down the inclined surface by its own weight until it comes into contact with the baffle plate (114). The baffle plate (114) is kept vertical by a torsion spring, which restricts the placement of the tube body (3) and ensures that it slides down horizontally. S2: Dynamic separation to prevent stacking: When the tube body (3) slides down, it pushes the partition (502) to deflect around the rotating rod (501); When the first tube (3) comes into contact with the stop (4), the subsequent tube (3) pushes the next partition (502) to deflect until it comes into contact with the previous tube (3), thus achieving automatic equidistant separation and avoiding collision and blockage. S3: Step-by-step conveyor to the end: The drive motor (805) starts, the rotating rod (801) drives the rotating shaft (111) to rotate through the synchronous wheel (13) and the synchronous belt, the sprocket (112) drives the chain (113) to move, and the baffle plate (114) fixed to the chain (113) assists the tube body (3) to move down step by step; If there is a stacked tube (3) in the moving path of the baffle (114), the baffle (1142) will be squeezed and deflected around the pin shaft, avoiding the tube (3) and then reset by the torsion spring to avoid hard interference; S4: Transfer and feeding linkage: The rotating rod (801) rotates under the action of the drive motor (805), and the eccentric plate (802) pushes the swing plate (803) to swing, so that the support (804) lifts the first tube (3) at the end of the feeding plate (2). The rotating rod (801) drives the driven gear (1001) through the driving gear (10), so that the conveying shaft (701) rotates synchronously; The tube (3) is lifted between two conveying rollers (702), and the spiral conveyor bar (7021) contacts the tube (3), driving it to rotate and move axially to the spray gun station; S5: Rotary spraying operation: The tube (3) rotates at a constant speed under the drive of the conveyor roller (702), and the spray gun sprays powder to cover its outer wall. The pitch of the spiral conveyor (7021) controls the axial conveying speed to ensure uniformity of spraying.

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