Spraying system and spraying method

Abstract

The present application relates to the field of powder spraying, and in particular to a spraying system and method, comprising a suspension conveyor line, a pretreatment tank, a drying furnace, a powder spraying chamber, and a curing furnace sequentially arranged along the conveying direction of the suspension conveyor line, the suspension conveyor line being equipped with a plurality of first hooks, each of the first hooks being equipped with a second hook, the second hook being equipped with a third hook, the second hook being fixedly equipped with a first mounting seat, the third hook being fixedly equipped with a second mounting seat, a telescopic rod being fixedly equipped between the first mounting seat and the second mounting seat, a support rod being fixedly equipped around the circumference of the second mounting seat, a plurality of pretreatment tanks being provided, the pretreatment tanks being equipped with a drive assembly, the drive assembly being used to drive the support rod to rise and fall. The present application has the effect of reducing the load transported by the suspension conveyor line.

Description

Technical Field

[0001] The present application relates to the field of powder spraying, and in particular to a spraying system and a spraying method. Background Art

[0002] In the fields of mechanical manufacturing and surface treatment, electrostatic powder coating technology has long been a key means of improving workpiece surface quality and protective properties. With the continuous development of industrial production, the demand for product appearance and durability has become increasingly stringent, and powder coating technology has also gained widespread application. It not only improves the corrosion and wear resistance of workpieces, but also creates an aesthetically pleasing surface. Widely used in numerous industries, including automotive, home appliances, and building materials, this technology significantly enhances product competitiveness and service life.

[0003] In existing electrostatic powder coating processes, workpieces require pretreatment to ensure effective coating. Conventional pretreatment typically includes degreasing, rust removal, phosphating, and water washing. A pretreatment tank is set up for each pretreatment step. Typically, the workpiece is suspended on a hanging conveyor line. When the hanging conveyor line reaches the top of the pretreatment tank, it tilts down, allowing the workpiece to be immersed in the tank for treatment. As the workpiece nears the exit of the tank, the hanging conveyor line tilts up again, carrying the workpiece out of the tank. The hanging conveyor line then transports the pretreated workpiece to the powder spray booth, where spray guns apply powder to the workpiece. The hanging conveyor line then transports the powder-coated workpiece to a curing oven, where it is heated to melt the powder and adhere to the workpiece surface. Finally, the workpiece is removed from the hanging conveyor line, completing the coating process.

[0004] However, when the suspension conveyor line needs to pass over multiple pretreatment tanks, the suspension conveyor line repeatedly tilts and rises, causing the suspension conveyor line to bend repeatedly. The more times the suspension conveyor line bends, the greater the load it carries. Summary of the Invention

[0005] In order to reduce the load of the hanging conveyor line, the present application provides a spraying system and a spraying method.

[0006] The present application provides a spraying system and a spraying method, which adopt the following technical solutions:

[0007] A spraying system includes a suspension conveyor line, a pretreatment tank, a drying furnace, a powder spraying chamber and a curing furnace arranged in sequence along the conveying direction of the suspension conveyor line, the suspension conveyor line is equipped with multiple first hooks, each of the first hooks is hung with a second hook, the second hook is provided with a third hook, the second hook is fixedly installed with a first mounting seat, the third hook is fixedly installed with a second mounting seat, a telescopic rod is fixedly installed between the first mounting seat and the second mounting seat, and a support rod is fixedly installed on the peripheral side of the second mounting seat, there are multiple pretreatment tanks, and the pretreatment tanks are equipped with a drive assembly, and the drive assembly is used to drive the support rod to rise and fall.

[0008] By adopting this technical solution, a suspended conveyor line transports workpieces through a pretreatment tank, drying oven, powder spray chamber, and curing oven, enabling spraying of the workpieces. Multiple hooks, a connecting seat, and a telescopic rod structure facilitate flexible adjustment of the workpiece height. A drive assembly drives the support rods up and down, automatically moving workpieces in and out of the pretreatment tank, reducing the number of bends on the suspended conveyor line and thus alleviating the conveying burden.

[0009] Optionally, the driving assembly includes a first horizontal rod, a first oblique rod, a second horizontal rod and a second oblique rod connected in sequence along the conveying direction of the suspension conveyor line. The first oblique rod and the second oblique rod are gradually raised from one end close to the second horizontal rod to the other end and are inclined. The end of the first horizontal rod away from the first oblique rod is fixedly connected to the second oblique rod upstream in the conveying direction of the suspension conveyor line.

[0010] By adopting this technical solution, the workpiece suspended on the third hook will move downward due to gravity. The first horizontal rod, the first diagonal rod, the second horizontal rod, and the second diagonal rod support the support rod, thereby limiting the workpiece's descent. Furthermore, the inclined and horizontal arrangement of the first horizontal rod, the first diagonal rod, the second horizontal rod, and the second diagonal rod allows for smooth entry and exit of the pretreatment tank, reducing the number of bends in the suspension conveyor line.

[0011] Optionally, a driving rod is hinged on the peripheral side of the first mounting seat, and an elastic rope is fixedly installed between the driving rod and the first mounting seat, and the elastic rope is used to pull the driving rod to rotate downward, and an insert block is fixedly installed on the end of the driving rod away from the first mounting seat, and a slot for inserting the insert block is opened on the peripheral side of the second mounting seat, and the bottom side of the insert block is tilted.

[0012] By employing this technical solution, after the workpiece passes through each pretreatment tank for pretreatment, the drive assembly drives the support rod upward. This rise in turn drives the second mounting block upward, which in turn compresses the insert block, causing the drive rod to rotate upward, clearing the insert block from the second mounting block. When the second mounting block reaches its maximum height, the elastic cord drives the drive rod downward, inserting the insert block into the slot, thereby limiting the second mounting block's movement. This allows the second mounting block to remain at its maximum height, thereby reducing the height of the subsequent powder spray booth and curing oven.

[0013] Optionally, a connecting rod is rotatably plugged into the side wall of the suspension conveyor line, and a cone block is fixedly installed on the connecting rod. The tip of the cone block is directed opposite to the conveying direction of the suspension conveyor line, and the cone block is used to push the driving rod to rotate upward.

[0014] By adopting this technical solution, the workpiece is suspended from the third hook, and the second hook is suspended from the first hook, and the workpiece is then transported by the suspension conveyor line toward the pretreatment tank. During this process, the cone block presses the drive rod, causing the drive rod to flip upward, thereby removing the insert from the slot, thereby facilitating the drive assembly to drive the second mounting base up and down via the support rod.

[0015] Optionally, conveyor belts are installed on both sides of the curing furnace entrance, and a plurality of push blocks are installed on the belt surface of the conveyor belt. The conveyor belt is gradually raised and inclined along the conveying direction of the suspension conveyor line. A parking rod is provided at the end of the conveyor belt, and the parking rod is horizontally arranged and fixedly connected to the inner wall of the curing furnace.

[0016] With this technical solution, as the suspended conveyor line transports the workpiece into the curing oven entrance, the support rods press against the top side of the conveyor belt. The conveyor belt's speed is faster than the suspended conveyor line, causing the push block to push the support rods forward. Simultaneously, the conveyor belt tilts upward, separating the first hook from the second hook. The conveyor belt then feeds the support rods onto the parking rods, where the curing oven heats and cures the workpieces. Because the conveyor belt's speed is faster than the suspended conveyor line, the workpieces enter the curing oven faster, improving the uniformity of the curing oven's heating of the workpieces.

[0017] Optionally, the push block is provided with a connecting seat, which is fixedly mounted on the belt surface of the conveyor belt. The connecting seat is provided with a connecting groove for the push block to be inserted. An elastic layer is fixedly mounted on the inner wall of the connecting groove, and the elastic layer wraps the part of the push block located inside the connecting groove.

[0018] By adopting the above technical solution, when the push block and the support rod squeeze each other, the push block shrinks into the connecting groove to avoid it, so that the conveyor belt has sufficient time to drive the support rod to lift and the first hook and the second hook are separated.

[0019] Optionally, a transport rod is provided between the conveyor belt and the parking rod, and the end of the transport rod away from the conveyor belt is fixedly connected to the parking rod. The transport rod is inclined and gradually lowers from one end close to the conveyor belt to the other end, and the transport rod is fixedly connected to the inner wall of the curing furnace.

[0020] By adopting the above technical solution, the hanging conveyor line transports the workpiece through the drying furnace and the powder spraying room to the conveyor belt. The conveyor belt pushes the workpiece to the transport rod through the push block. The transport rod is tilted to facilitate the workpiece to slide naturally to the parking rod by gravity, thereby reducing the situation where the conveyor belt enters the curing furnace, and further reducing the situation where the service life of the conveyor belt is reduced after being heated inside the curing furnace.

[0021] Optionally, an elastic rod is fixedly mounted on the rod body of the transport rod, and one end of the elastic rod away from the transport rod is pressed against the belt surface on the bottom side of the conveyor belt.

[0022] By adopting this technical solution, the conveyor drive compresses the elastic rod via the push block, causing it to deform. After the push block separates from the elastic rod, the elastic rod returns to its original shape. This repeated deformation and recovery of the elastic rod causes the transport rod to vibrate, facilitating the support rod's sliding along the transport rod toward the parking rod.

[0023] Optionally, a material receiving trough is fixedly installed on one side of the pretreatment tank located downstream in the conveying direction of the suspension conveyor line, and the material receiving trough is gradually raised and inclined from one end to the other end of the pretreatment tank.

[0024] By adopting the above technical solution, when the hanging conveyor line drives the workpiece out of the pretreatment tank, the receiving trough can catch the pretreatment liquid dripping from the workpiece, and because the receiving trough is set at an angle, the pretreatment liquid can flow back into the pretreatment tank along the receiving trough, reducing the waste of pretreatment liquid.

[0025] A spraying method includes the following steps: suspending a workpiece on a suspension conveyor line; pre-treating the workpiece, wherein the pre-treatment includes degreasing, rust removal, phosphating and water washing; the workpiece enters a drying furnace for drying; the workpiece enters a powder spraying chamber for powder spraying; the workpiece enters a curing chamber for heating and curing; and the workpiece is removed from the suspension conveyor line.

[0026] By adopting the above technical solution, a complete spraying process for the workpiece can be realized, including hanging the workpiece, pretreatment, drying, powder spraying, curing and removing the workpiece; the use of a specific spraying system can reduce the number of repeated bending times of the hanging conveyor line, reduce the conveying burden, and facilitate the control of the workpiece in and out of the pretreatment tank.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] The driving assembly drives the support rod up and down, so that the workpiece can enter and exit the pretreatment tank without bending the suspension conveyor line, thus reducing the burden of the suspension conveyor line;

[0029] The conveyor belt is used to speed up the speed at which the workpiece enters the curing furnace, thereby improving the uniformity of the curing furnace heating the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0031] Figure 2 This is a schematic diagram of the structure of the first pretreatment tank and the hanging conveyor line along the process of the embodiment of the present application;

[0032] Figure 3 This is a schematic diagram of the structure in which the second hook is suspended on the first hook in the suspension conveyor line according to an embodiment of the present application;

[0033] Figure 4 is a structural schematic diagram of a curing furnace according to an embodiment of the present application;

[0034] Figure 5 This is a structural diagram of a conveyor belt and a suspension conveyor line according to an embodiment of the present application;

[0035] Figure 6 It is a cross-sectional view of the connecting seat according to an embodiment of the present application.

[0036] Explanation of the accompanying drawings: 1. Suspension conveyor line; 2. Pretreatment tank; 3. Drying furnace; 4. Powder spraying room; 5. Curing furnace; 6. First hook; 7. Second hook; 8. Third hook; 9. First mounting seat; 10. Second mounting seat; 11. Telescopic rod; 12. Support rod; 13. Drive assembly; 131. First horizontal rod; 132. First oblique rod; 133. Second horizontal rod; 134. Second oblique rod; 14. Drive rod; 15. Elastic rope; 16. Insert block; 17. Slot; 18. Connecting rod; 19. Cone block; 20. Conveyor belt; 21. Connecting seat; 22. Connecting groove; 23. Elastic layer; 24. Push block; 25. Elastic rod; 26. Material receiving trough; 27. Transport rod; 28. Parking rod. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-6 This application is described in further detail.

[0038] The embodiments of the present application disclose a spraying system and a spraying method.

[0039] Reference Figure 1A spraying system includes a suspension conveyor line 1, a pretreatment tank 2, a drying oven 3, a powder spraying chamber 4, and a curing oven 5, which are sequentially arranged along the conveying direction of the suspension conveyor line 1. The suspension conveyor line 1 transmits workpieces between the pretreatment tank 2, the drying oven 3, the powder spraying chamber 4, and the curing oven 5, so that workpieces can complete the pretreatment, drying, powder spraying, and curing processes in sequence under the drive of the suspension conveyor line 1, realizing automated spraying operations and improving work efficiency.

[0040] Reference Figure 2 The suspension conveyor line 1 is equipped with multiple first hooks 6. The first hooks 6 are usually made of metal to ensure sufficient strength to suspend the workpiece. Of course, high-strength plastic or other materials can also be used to reduce weight. The first hooks 6 are installed on the suspension conveyor line 1 by welding or bolting, and are evenly spaced to suspend the workpiece.

[0041] The first hook 6 is hung with a second hook 7 , which can also be made of metal or high-strength plastic. The second hook 7 is provided with a third hook 8 .

[0042] The second hook 7 is fixedly mounted with a first mounting base 9, which is generally a round or square block structure and is connected to the second hook 7 by welding or integral molding. The third hook 8 is fixedly mounted with a second mounting base 10, which is the same as the first mounting base 9 and is also a basic structure for connecting other components.

[0043] A telescopic rod 11 is fixedly mounted between the first mounting seat 9 and the second mounting seat 10. The telescopic rod 11 is formed by a plurality of sub-tubes arranged in a sequence, with stoppers between adjacent sub-tubes to restrict relative rotation and removal of the sub-tubes from one another. Telescopic rod 11 can be extended or retracted to adjust the distance between the first mounting seat 9 and the second mounting seat 10, thereby facilitating adjustment of the height of the second mounting seat 10 and, consequently, the height of the workpiece suspended from the third hook 8.

[0044] A support rod 12 is fixedly mounted on the peripheral side of the second mounting seat 10, and the cross-section of the support rod 12 is rectangular or circular. In the embodiment of the present application, the cross-section of the support rod 12 is circular. There are multiple pretreatment tanks 2, and each pretreatment tank 2 corresponds to a different pretreatment process, such as degreasing, rust removal, phosphating and water washing, etc. A corresponding number of pretreatment tanks 2 are set according to the number of processes. The pretreatment tank 2 is equipped with a drive assembly 13, and the drive assembly 13 is used to drive the support rod 12 to rise and fall. The setting of the drive assembly 13 allows the workpiece to enter the pretreatment tank 2 without relying on the tilting and lifting of the suspension conveyor line 1, reducing the number of bends of the suspension conveyor line 1 and reducing the conveying burden.

[0045] Reference Figure 1 、 Figure 2The drive assembly 13 includes a first horizontal rod 131, a first diagonal rod 132, a second horizontal rod 133 and a second diagonal rod 134 connected in sequence along the conveying direction of the suspension conveyor line 1. The first horizontal rod 131 and the second horizontal rod 133 are horizontally arranged straight rods that play a role of support and transition. The first diagonal rod 132 and the second diagonal rod 134 are gradually raised from one end close to the second horizontal rod 133 to the other end and are arranged in an inclined manner. This inclined arrangement facilitates the lifting and lowering of the support rod 12 when it slides on it. The end of the first horizontal rod 131 away from the first diagonal rod 132 is fixedly connected to the second diagonal rod 134 upstream in the conveying direction of the suspension conveyor line 1, forming a continuous drive path. When the suspension conveyor line 1 drives the workpieces on the second hook 7 and the third hook 8 to move above the pretreatment tank 2, the support rod 12 slides on the drive assembly 13 and rises and falls with the inclination of the first diagonal rod 132 and the second diagonal rod 134, thereby allowing the workpiece to enter or leave the pretreatment tank 2.

[0046] In another embodiment, the driving component 13 is a cylinder, and the cylinder is installed on the pretreatment tank 2 to achieve the lifting of the workpiece.

[0047] Reference Figure 2 、 Figure 3 A driving rod 14 is hinged on the peripheral side of the first mounting seat 9. An elastic rope 15 is fixedly installed between the driving rod 14 and the first mounting seat 9. The elastic rope 15 is used to pull the driving rod 14 toward the first mounting seat 9, thereby causing the driving rod 14 to rotate downward.

[0048] An insert 16 is fixedly mounted on the end of the drive rod 14 away from the first mounting base 9. Insert 16 is typically a wedge-shaped or rectangular block structure, connected to the drive rod 14 by welding or integral molding. A slot 17 is defined around the periphery of the second mounting base 10 for inserting insert 16. Slot 17 is larger than insert 16, and the bottom side of insert 16 is tilted.

[0049] The end of the second inclined rod 134, located at the final pretreatment tank 2 in the spraying process, is extended, allowing the second mounting seat 10 to reach its highest point. When the second mounting seat 10 reaches its highest point, the elastic cord 15 drives the drive rod 14 downward, inserting the insert 16 into the slot 17. This restricts relative movement between the first mounting seat 9 and the second mounting seat 10, facilitating the close proximity of the second hook 7 and the third hook 8 for storage. When the insert 16 is removed from the slot 17, the drive assembly 13, via the support rod 12, can drive the second mounting seat 10 upward and downward.

[0050] Reference Figure 2 、 Figure 3, a connecting rod 18 is rotatably plugged into the side wall of the suspension conveyor line 1, and a cone block 19 is fixedly installed on the connecting rod 18. The direction of the tip of the cone block 19 is opposite to the conveying direction of the suspension conveyor line 1. The workpiece is hung on the third hook 8, and the second hook 7 is hung on the first hook 6. The suspension conveyor line 1 drives the second hook 7 to move toward the first pretreatment tank 2. When the suspension conveyor line 1 drives the second hook 7 to move toward the first pretreatment tank 2, it will pass through the cone block 19. The cone block 19 will push the drive rod 14 to rotate upward, so that the insert block 16 disengages from the slot 17, thereby realizing automatic separation between the first mounting seat 9 and the second mounting seat 10, and then facilitating the drive assembly 13 to drive the second mounting seat 10 to rise and fall through the support rod 12. When the suspension conveyor line 1 drives the second hook 7 to pass through the cone block 19, the drive rod 14 squeezes the connecting rod 18, and the connecting rod 18 rotates to avoid the drive rod 14, thereby facilitating the suspension conveyor line 1 to drive the second hook 7 to pass through the cone block 19.

[0051] After the suspension conveyor line 1 passes through the last pretreatment tank 2, it descends, thereby facilitating the reduction of the heights of the drying oven 3, the powder spraying room 4 and the curing oven 5.

[0052] Reference Figure 4 、 Figure 5 Conveyor belts 20 are installed on both sides of the inner wall of the curing furnace 5 entrance. The conveyor belts 20 can be belt conveyors or chain conveyors, etc., and a chain conveyor is used as an example here. The belt surface of the conveyor belt 20 is fixedly mounted with a plurality of connecting seats 21, and the connecting seats 21 are fixed to the belt surface of the conveyor belt 20 by bolts or welding.

[0053] Reference Figure 5 、 Figure 6 The connecting seat 21 is provided with a connecting groove 22 , an elastic layer 23 is fixedly installed on the inner wall of the connecting groove 22 , a push block 24 is inserted into the inside of the connecting groove 22 , and the elastic layer 23 fixedly wraps the part of the push block 24 located inside the connecting groove 22 .

[0054] The conveyor belt 20 is gradually elevated and tilted along the conveying direction of the suspended conveyor line 1. A transport rod 27 and a parking rod 28 are provided at the ends of the conveyor belt 20. The rods of the transport rod 27 and the parking rod 28 are both fixedly connected to the inner bottom wall of the curing oven 5. The transport rod 27 is positioned between the parking rod 28 and the conveyor belt 20. One end of the transport rod 27 is fixedly connected to one end of the parking rod 28. The transport rod 27 is gradually lowered and tilted from one end of the conveyor belt 20 to the other end. The parking rod 28 is arranged horizontally and is used to temporarily park the support rod 12.

[0055] When the suspended conveyor line 1 moves the workpiece to the entrance of the curing oven 5, the support rod 12 is positioned above the conveyor belt 20. As the suspended conveyor line 1 continues to carry the workpiece into the curing oven 5, the support rod 12 comes into contact with the surface of the conveyor belt 20. Because the conveying speed of the conveyor belt 20 is faster than that of the suspended conveyor line 1, the conveyor belt 20 pushes the support rod 12 forward via the push block 24, and the conveyor belt 20 tilts upward, causing the support rod 12 to move diagonally upward, thereby separating the first hook 6 from the second hook 7.

[0056] After the first hook 6 and the second hook 7 are separated, the conveyor belt 20 continues to push the support rod 12 via the push block 24, causing the support rod 12 to slide toward the transport rod 27. Guided by the tilt of the transport rod 27, the support rod 12 slides toward the parking rod 28. The parking rod 28 is located in the heated area of ​​the curing oven 5, allowing the workpiece to be heated and cured within the curing oven 5.

[0057] The suspension conveyor line 1 then continues conveying, and the first hook 6 on the suspension conveyor line 1 re-engages the second hook 7 on the parking rod 28. The suspension conveyor line 1, through the contact between the first hook 6 and the second hook 7, pushes the support rod 12 to slide on the parking rod 28. After the support rod 12 separates from the parking rod 28, gravity causes the workpiece to move downward, causing the second hook 7 to re-engage the first hook 6. The suspension conveyor line 1 then drives the workpiece within the curing oven 5.

[0058] The conveyor belt 20 is used to accelerate the delivery of the workpiece into the curing oven 5 for heating, thereby improving the uniformity of the workpiece heating by the curing oven 5. In another embodiment, a conveyor belt 20 can also be provided at the outlet of the curing oven 5 to accelerate the removal of the workpiece from the curing oven 5.

[0059] After the support rod 12 slides into the parking rod 28 from the transportation rod 27, the support rod 12 is subjected to inertia to slide on the parking rod 28. By extending the length of the parking rod 28 or reducing the angle of inclination of the transportation rod 27, the situation of the support rod 12 sliding off the parking rod 28 due to inertia is reduced.

[0060] An elastic rod 25 is fixedly mounted on the shaft of the transport rod 27. The end of the elastic rod 25, away from the transport rod 27, abuts against the bottom surface of the conveyor belt 20. The push block 24 and the elastic rod 25 squeeze against each other, causing the elastic rod 25 to vibrate. The vibrating elastic rod 25, in turn, causes the transport rod 27 to vibrate, facilitating the sliding of the support rod 12 from the transport rod 27 to the parking rod 28.

[0061] Reference Figure 1The pretreatment tank 2 is located on the downstream side of the suspension conveyor line 1 in the conveying direction. A receiving trough 26 is fixedly installed. The receiving trough 26 is gradually raised and inclined from one end to the other end of the pretreatment tank 2. The receiving trough 26 is used to receive the pretreatment liquid dripping from the workpiece, thereby reducing waste.

[0062] A spraying method, using a spraying system according to an embodiment of the present application, includes the following steps:

[0063] S1, hang the workpiece on the suspension conveyor line 1;

[0064] S2. Pre-treating the workpiece, wherein the pre-treatment includes degreasing, rust removal, phosphating and washing;

[0065] S3, the workpiece enters the drying furnace 3 for drying;

[0066] S4, the workpiece enters the powder spraying room 4 for powder spraying;

[0067] S5, the workpiece enters the curing chamber for heating and curing;

[0068] S6. Remove the workpiece from the suspension conveyor line 1.

[0069] The implementation principle of a spraying system and a spraying method in an embodiment of the present application is: through the coordinated cooperation of components such as a suspension conveyor line 1, multiple hooks, a connecting seat 21, a telescopic rod 11, a support rod 12 and a drive assembly 13, the workpiece does not need to be repeatedly tilted and raised and lowered by the suspension conveyor line 1 during the pretreatment process, thereby reducing the number of bending times and the conveying burden of the suspension conveyor line 1 and improving the service life and conveying efficiency of the suspension conveyor line 1.

[0070] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A spraying system, characterized in that: The invention comprises a suspension conveyor line (1), a pretreatment pool (2), a drying furnace (3), a powder spraying chamber (4) and a curing furnace (5) arranged in sequence along the conveying direction of the suspension conveyor line (1), the suspension conveyor line (1) is equipped with a plurality of first hooks (6), each of the first hooks (6) is hung with a second hook (7), the second hook (7) is equipped with a third hook (8), the second hook (7) is fixedly installed with a first mounting seat (9), the third hook (8) is fixedly installed with a second mounting seat (10), a telescopic rod (11) is fixedly installed between the first mounting seat (9) and the second mounting seat (10), a support rod (12) is fixedly installed on the peripheral side of the second mounting seat (10), there are a plurality of pretreatment pools (2), the pretreatment pool (2) is equipped with a drive assembly (13), and the drive assembly (13) is used to drive the support rod (12) to rise and fall; A driving rod (14) is hinged on the peripheral side of the first mounting seat (9), and an elastic rope (15) is fixedly installed between the driving rod (14) and the first mounting seat (9). The elastic rope (15) is used to pull the driving rod (14) to rotate downward, and an insert block (16) is fixedly installed on the end of the driving rod (14) away from the first mounting seat (9). A slot (17) for inserting the insert block (16) is provided on the peripheral side of the second mounting seat (10), and the bottom side of the insert block (16) is inclined. Conveyor belts (20) are installed on both sides of the entrance of the curing furnace (5), and a plurality of push blocks (24) are installed on the belt surface of the conveyor belt (20). The conveyor belt (20) is gradually raised and tilted along the conveying direction of the suspension conveyor line (1), and a parking rod (28) is provided at the end of the conveyor belt (20), and the parking rod (28) is horizontally arranged. The parking rod (28) is fixedly connected to the inner wall of the curing furnace (5); a transport rod (27) is provided between the conveyor belt (20) and the parking rod (28), and the end of the transport rod (27) away from the conveyor belt (20) is fixedly connected to the parking rod (28), and the transport rod (27) is gradually lowered and tilted from one end close to the conveyor belt (20) to the other end, and the transport rod (27) is fixedly connected to the inner wall of the curing furnace (5); When the hanging conveyor line (1) drives the workpiece to move to the entrance of the curing furnace (5), the support rod (12) is located above the conveyor belt (20); when the hanging conveyor line (1) continues to drive the workpiece into the curing furnace (5), the support rod (12) abuts against the surface of the conveyor belt (20), and the conveying speed of the conveyor belt (20) is faster than the conveying speed of the hanging conveyor line (1); After the first hook (6) is separated from the second hook (7), the conveyor belt (20) continues to push the support rod (12) to slide toward the transport rod (27) through the push block (24), and the support rod (12) is guided by the tilt of the transport rod (27) and slides toward the parking rod (28), and the parking rod (28) is located in the area heated by the curing furnace (5); Afterwards, the suspension conveyor line (1) continues to convey, and the first hook (6) on the suspension conveyor line (1) re-contacts the second hook (7) on the parking rod (28) to push the support rod (12) to slide on the parking rod (28). After the support rod (12) is separated from the parking rod (28), the workpiece moves downward due to gravity and the second hook (7) is re-suspended on the first hook (6).

2. A spraying system according to claim 1, characterized in that: The driving assembly (13) comprises a first horizontal rod (131), a first oblique rod (132), a second horizontal rod (133) and a second oblique rod (134) which are sequentially connected along the conveying direction of the suspension conveyor line (1); the first oblique rod (132) and the second oblique rod (134) are both gradually raised and inclined from one end close to the second horizontal rod (133) to the other end; and the end of the first horizontal rod (131) away from the first oblique rod (132) is fixedly connected to the second oblique rod (134) upstream in the conveying direction of the suspension conveyor line (1).

3. A spraying system according to claim 1, characterized in that: A connecting rod (18) is rotatably connected to the side wall of the suspension conveyor line (1), and a cone block (19) is fixedly installed on the connecting rod (18). The tip of the cone block (19) is oriented opposite to the conveying direction of the suspension conveyor line (1), and the cone block (19) is used to push the driving rod (14) to rotate upward.

4. A spraying system according to claim 1, characterized in that: The push block (24) is provided with a connecting seat (21), the connecting seat (21) is fixedly mounted on the belt surface of the conveyor belt (20), the connecting seat (21) is provided with a connecting groove (22) for the push block (24) to be plugged in, an elastic layer (23) is fixedly mounted on the inner wall of the connecting groove (22), and the elastic layer (23) wraps the portion of the push block (24) located inside the connecting groove (22).

5. A spraying system according to claim 1, characterized in that: An elastic rod (25) is fixedly mounted on the rod body of the transport rod (27), and one end of the elastic rod (25) away from the transport rod (27) abuts against the belt surface on the bottom side of the conveyor belt (20).

6. A spraying system according to claim 1, characterized in that: A material receiving trough (26) is fixedly installed on one side of the pretreatment tank (2) located downstream in the conveying direction of the suspension conveyor line (1), and the material receiving trough (26) is gradually raised from one end close to the pretreatment tank (2) to the other end and is arranged in an inclined manner.

7. A spraying method, applied to a spraying system according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: suspending a workpiece on a suspension conveyor line (1); pre-treating the workpiece, wherein the pre-treatment comprises degreasing, rust removal, phosphating and water washing; The workpiece enters the drying furnace (3) for drying; the workpiece enters the powder spraying room (4) for powder spraying; the workpiece enters the curing room for heating and curing; the workpiece is removed from the hanging conveyor line (1).

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