Automatic production equipment for PVC guardrails

Abstract

The present application relates to PVC guardrail production technical field, especially in kind of PVC guardrail automatic production equipment, the cylinder is fixedly installed at the top of support base, the cylinder output end is fixedly installed with pneumatic rod, the pneumatic rod is fixedly installed with first mould at the end away from the cylinder, first mould is fixedly installed with mounting plate in the inside, the one end of mounting plate close to first mould is fixedly installed with first spring, the one end of first spring away from mounting plate is fixedly installed with mounting disc, the inside of mounting disc is fixedly installed with mounting cylinder, the one end of mounting cylinder away from mounting plate is connected with flap through hinge, through the collaborative work of pouring machine, stamping pump and multiple groups of air pipes, the PVC solution is filled between first mould and second mould quickly and uniformly, and the preliminary forming is completed.This design avoids the uneven problem that may appear in manual pouring, improves the forming quality and production efficiency of products.

Description

Technical Field

[0001] This invention relates to the field of PVC fence production technology, and in particular to an automated PVC fence production equipment. Background Technology

[0002] In the fields of building decoration and protection, PVC fences are widely used in various locations, such as residential communities, commercial building perimeters, and road barriers, due to their advantages of corrosion resistance, aesthetics, and relatively low cost. As market demand for PVC fences continues to grow, the requirements for their production efficiency and quality are also increasing.

[0003] In traditional PVC fence production, the solution pouring process largely relies on manual operation. Manual pouring has several drawbacks. Firstly, it's difficult to ensure consistent pouring speed. During long hours of work, worker fatigue and other factors can cause inconsistent pouring speeds, resulting in unstable flow of the PVC solution within the mold and affecting the uniformity of the final product. Secondly, it's challenging to achieve uniform solution distribution manually. For example, in large molds, workers may not be able to accurately control the amount of solution filling in each area, leading to localized solution buildup or underfilling. When solution buildup occurs, the PVC fence in that area may be too thick, affecting overall aesthetics and mechanical properties; while underfilled areas may lack strength and be prone to damage in actual use. These quality issues not only reduce product yield and increase production costs but may also pose safety hazards to the installation site.

[0004] Furthermore, manual casting has relatively low production efficiency, making it difficult to meet the ever-increasing market demand. With the acceleration of urbanization, the demand for PVC railings from various construction projects has risen sharply. The production speed of traditional manual casting methods severely restricts the production capacity of enterprises, resulting in insufficient market supply and affecting the progress of related projects. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an automated PVC guardrail production equipment, thereby solving the technical problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An automatic PVC fence production equipment includes a support base, characterized in that a forming mechanism is fixedly installed on the top of the support base, the forming mechanism includes a cylinder, the cylinder is fixedly installed on the top of the support base, a pneumatic rod is fixedly installed on the output end of the cylinder, a first mold is fixedly installed on the end of the pneumatic rod away from the cylinder, an installation plate is fixedly installed inside the first mold, a first spring is fixedly installed on the end of the installation plate near the first mold, an installation disc is fixedly installed on the end of the first spring away from the installation plate, an installation cylinder is fixedly installed inside the installation disc, and a flap is connected to the end of the installation cylinder away from the installation plate via a hinge.

[0008] In one possible implementation, a heating plate is fixedly installed on the side wall of the first mold, the mounting cylinder is slidably installed inside the first mold, a stamping pump is fixedly installed on the side wall of the support base, a first air pipe is fixedly installed at the output end of the stamping pump, a U-shaped tube is fixedly installed at the end of the first air pipe away from the stamping pump, a first valve is provided inside the left side of the U-shaped tube, and the U-shaped tube is fixedly installed with the first mold.

[0009] In one possible implementation, a second trachea is fixedly installed on both the upper and lower sides of the first trachea, a second valve is provided inside each of the two second tracheas, and a third trachea is fixedly installed at the end of each of the two second tracheas away from the first trachea.

[0010] In one possible implementation, a third valve is fixedly installed inside the third trachea, and a first connecting tube is fixedly installed at the end of each of the two third tracheas away from the second trachea, with a second connecting tube slidably installed inside the two first connecting tubes.

[0011] In one possible implementation, a casting machine is fixedly installed at the ends of the two first connecting pipes away from the second connecting pipe, and a second mold is slidably installed on the support base, with a sliding rod fixedly installed at the end of the second mold away from the first mold.

[0012] In one possible implementation, the sliding rod is slidably mounted inside the support base, and a first rack is fixedly mounted on the side wall of the second mold, the first rack being slidably mounted inside the support base.

[0013] In one possible implementation, a first gear is meshed on the side wall of the first rack, the first gear is rotatably mounted on the side wall of the support base, and a first synchronous belt drive assembly is driven on the side wall of the first gear.

[0014] In one possible implementation, a second synchronous belt drive assembly is driven and installed on the side wall of the first gear, a servo motor is fixedly installed on the side wall of the support base, the output shaft of the servo motor is rotatably installed on the side wall of the support base, and the side wall of the output shaft of the servo motor is driven and installed with the second synchronous belt drive assembly.

[0015] In one possible implementation, a second gear is internally mounted on the second synchronous belt drive assembly. The second gear is rotatably mounted on the side wall of the support base. A second rack is meshed with the side wall of the second gear. A third mold is fixedly mounted on the side wall of the second rack.

[0016] In one possible implementation, a fixing rod is slidably installed inside the third mold, and a top plate is fixedly installed at the end of the fixing rod near the third mold. A connecting plate is fixedly installed on the side wall of the support base, and the fixing rod is slidably installed inside the connecting plate. A second spring is fixedly installed at the end of the connecting plate away from the second mold, and the end of the second spring away from the connecting plate is fixedly installed with the fixing rod.

[0017] Beneficial effects compared to existing technologies:

[0018] 1. In this solution, the coordinated operation of the casting machine, the press pump, and multiple sets of air pipes enables the rapid and uniform filling of PVC solution between the first and second molds, completing the initial molding. This design avoids the unevenness problems that may occur with manual casting, improving the molding quality and production efficiency of the product. For example, traditional manual casting may lead to localized solution accumulation or insufficient filling, while this equipment ensures a comprehensive and uniform distribution of the solution, guaranteeing the quality stability of the PVC railing.

[0019] 2. In this solution, the servo motor precisely controls the movement of the second mold through a synchronous belt drive assembly and a gear and rack structure, enabling it to open at the appropriate position for easy removal of the first mold while providing a stable molding environment in other stages. Simultaneously, the negative pressure generated by the suction of the stamping pump achieves semi-shell adsorption, a clever and reliable operation. This design not only improves the automation level of the production process but also reduces errors that may be caused by manual intervention, enhancing production accuracy and product consistency.

[0020] 3. In this design, the third gas pipe not only assists in transmitting gas to the first connecting pipe during the molding stage, ensuring the PVC solution completely fills the space between the first and second molds, but also sprays gas in subsequent stages to expel any remaining solution inside the first connecting pipe, preventing solidification and blockage. This design, where the same component plays different key roles at different production stages, simplifies the equipment structure, reduces the use of additional components, lowers equipment costs and the risk of failure, while simultaneously improving the continuity and reliability of the production process. Attached Figure Description

[0021] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the connecting plate structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the sliding rod structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the second rack structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the heating plate structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the mounting plate structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the mounting cylinder structure of the present invention;

[0029] Figure 8 This is a schematic diagram of the third tracheal structure of the present invention.

[0030] Legend: 11. Support base; 12. Pneumatic rod; 13. First mold; 14. Mounting plate; 15. Mounting cylinder; 16. Mounting disc; 17. First spring; 18. Flip plate; 19. Stamping pump; 21. First air pipe; 22. U-shaped pipe; 23. Second air pipe; 24. Third air pipe; 25. First connecting pipe; 26. Second connecting pipe; 27. Second mold; 28. Sliding rod; 29. ​​First rack; 31. First gear; 32. First synchronous belt drive assembly; 33. Second synchronous belt drive assembly; 34. Second gear; 35. Servo motor; 36. Second rack; 37. Third mold; 38. Fixing rod; 39. Top plate; 41. Second spring; 42. Connecting plate; 43. Heating plate; 45. Cylinder. Detailed Implementation

[0031] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention can also be implemented in various different forms, and therefore the present invention is not limited to the embodiments described below. In addition, for the purpose of more clearly describing the present invention, parts not connected to the invention will be omitted from the drawings.

[0032] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0033] Example:

[0034] Please refer to Figures 1 to 8 As shown, this embodiment introduces an automatic PVC fence production equipment, including a support base 11. When in use, the casting machine is started to fill the first connecting pipe 25 with PVC solution inside the casting machine. A cylinder 45 is fixedly installed on the top of the support base 11, and a pneumatic rod 12 is fixedly installed on the output end of the cylinder 45. A first mold 13 is fixedly installed on the end of the pneumatic rod 12 away from the cylinder 45. The first connecting pipe 25 fills the solution into the second connecting pipe 26, and the second connecting pipe 26 then injects the solution into the second mold 27. When it is almost full, the press pump 19 is started.

[0035] An installation plate 14 is fixedly installed inside the first mold 13. A first spring 17 is fixedly installed at the end of the installation plate 14 near the first mold 13. An installation disc 16 is fixedly installed at the end of the first spring 17 away from the installation plate 14. An installation cylinder 15 is fixedly installed inside the installation disc 16. The installation cylinder 15 is slidably installed inside the first mold 13. A flap 18 is connected to the end of the installation cylinder 15 away from the installation plate 14 via a hinge. A press pump 19 transmits gas to the inside of a first air pipe 21, and then to the inside of a second air pipe 23. The second air pipe 23 then transmits gas to the inside of a first connecting pipe 25, and the third air pipe 24 then transmits gas to the inside of the first connecting pipe 25. The blowing of the gas completely fills the space between the first mold 13 and the second mold 27 with PVC solution. At this time, the installation cylinder 15 cannot push open the flap 18 due to the pressure of the air and the compression of the PVC solution, and the solution will not enter the inside of the installation cylinder 15. A stamping pump 19 is fixedly installed on the side wall of the support base 11. A first air pipe 21 is fixedly installed at the output end of the stamping pump 19. A U-shaped pipe 22 is fixedly installed at the end of the first air pipe 21 away from the stamping pump 19. A first valve is provided inside the pipe on the left side of the U-shaped pipe 22. The U-shaped pipe 22 is fixedly installed with the first mold 13. Second air pipes 23 are fixedly installed on both the upper and lower sides of the first air pipe 21. A second valve is provided inside each of the two second air pipes 23. A third air pipe 24 is fixedly installed at the end of each of the two second air pipes 23 away from the first air pipe 21. A third valve is fixedly installed inside the third air pipe 24. A first connecting pipe 25 is fixedly installed at the end of each of the two third air pipes 24 away from the second air pipes 23. A second connecting pipe 26 is slidably installed inside each of the two first connecting pipes 25. A casting machine is fixedly installed at the end of each of the two first connecting pipes 25 away from the second connecting pipe 26. After the PVC solution cools down, the servo motor 35 is started.

[0036] A second mold 27 is slidably mounted on the support base 11. A sliding rod 28 is fixedly mounted on the end of the second mold 27 away from the first mold 13. The sliding rod 28 is slidably mounted inside the support base 11. A first rack 29 is fixedly mounted on the side wall of the second mold 27. The first rack 29 is slidably mounted inside the support base 11. A first gear 31 is meshed on the side wall of the first rack 29. The servo motor 35 rotates counterclockwise, driving the second synchronous belt drive assembly 33 to rotate counterclockwise. The second synchronous belt drive assembly 33 drives the first gear 31 to rotate counterclockwise. The first gear 31 drives the first synchronous belt drive assembly 32 to rotate counterclockwise. The first gear 31 causes the two first racks 29 to move up and down respectively. The first racks 29 drive the second mold 27 to move up and down. The second mold 27 drives the sliding rod 28 to move up and down inside the support base 11, increasing the stability of the device. At this time, the second mold 27 is not fully opened, and the first mold 13 can be removed from inside the second mold 27. The first gear 31 is rotatably mounted on the side wall of the support base 11. The first synchronous belt drive assembly 32 is driven and mounted on the side wall of the first gear 31. The second synchronous belt drive assembly 33 is driven and mounted on the side wall of the first gear 31. At this time, the stamping pump 19 is started to draw in air. Because there is a third valve inside the third air pipe 24, the third air pipe 24 will not be able to draw out gas. The PVC solution will also not be able to flow back into the second air pipe 23 from the third air pipe 24. The gas inside the first air pipe 21 will be drawn out by the stamping pump 19 to form a negative pressure. The first air pipe 21 will create a negative pressure inside the first mold 13. The first mold 13 will move the mounting plate 16 from both sides to the middle. The mounting plate 16 will drive the mounting cylinder 15 from both sides to the middle. At this time, the first spring 17 will be compressed by force, the flip plate 18 will be in the closed state, and the mounting cylinder 15 will slide into the mounting plate 14, so that the first mold 13 will adsorb the half shell.

[0037] A servo motor 35 is fixedly installed on the side wall of the support base 11. The output shaft of the servo motor 35 is rotatably installed on the side wall of the support base 11. The side wall of the output shaft of the servo motor 35 is connected to the second synchronous belt transmission assembly 33. Then, the cylinder 45 is started, and the cylinder 45 drives the pneumatic rod 12 to extend. The pneumatic rod 12 drives the first mold 13 that adsorbs the half shell to move from left to right. The first mold 13 drives the heating plate 43 to move from left to right as well. The second synchronous belt drive assembly 33 has a second gear 34 internally installed. The second gear 34 is rotatably mounted on the side wall of the support base 11. When the heating plate 43 moves between the third mold 37, the servo motor 35 is started again. The servo motor 35 rotates counterclockwise, driving the second synchronous belt drive assembly 33 to rotate counterclockwise. The second synchronous belt drive assembly 33 drives the second gear 34 to rotate counterclockwise. The second gear 34 drives the second rack 36 to move from both sides to the middle. The second rack 36 drives the third mold 37 to move from both sides to the middle. The third mold 37 clamps the heating plate 43, and the heating plate 43 heats the third mold 37. The second gear 34 has a second rack 36 meshing with its side wall, and the second rack 36 has a third mold 37 fixedly installed on its side wall. The servo motor 35 is then started, and the servo motor 35 drives the second synchronous belt drive assembly 33 to rotate clockwise, causing the third mold 37 to move from the middle to both sides. The cylinder 45 is started again, and the cylinder 45 drives the first mold 13 to move from left to right. When the first mold 13 moves to the third mold 37, the third mold 37 clamps the first mold 13 and heats the half shell. The third mold 37 will be in a semi-melted state. A fixing rod 38 is slidably installed inside the third mold 37. A top plate 39 is fixedly installed at one end of the fixing rod 38 near the third mold 37. When the stamping pump 19 is started again, the stamping pump 19 will spray gas again. At this time, the flip plate 18 will flip the cover and spray gas out, so that the half shell will no longer adhere to the side wall of the first mold 13. At the same time, the third air pipe 24 sprays gas to spray out the residual solution inside the first connecting pipe 25, preventing it from solidifying inside the first connecting pipe 25.

[0038] A connecting plate 42 is fixedly installed on the side wall of the support base 11. A fixing rod 38 is slidably installed inside the connecting plate 42. A second spring 41 is fixedly installed on the end of the connecting plate 42 away from the second mold 27. The end of the second spring 41 away from the connecting plate 42 is fixedly installed with the fixing rod 38. At this time, the third mold 37 moves from the middle to both sides. The half shell will adhere to the inside of the third mold 37. The stamping pump 19 is started again. The stamping pump 19 drives the first mold 13 to move from right to left to its maximum size. The first mold 13 will return to the third mold 37. The third mold 37 closes again, and the third mold 37 combines the two half shells into a complete guardrail. A heating plate 43 is fixedly installed on the side wall of the first mold 13. When the third mold 37 is opened again, the guardrail contacts the top plate 39. The top plate 39 pushes the guardrail out of the third mold 37, completing the demolding operation.

[0039] Working principle: Solution injection and preliminary molding

[0040] Solution Injection: When using the equipment, first start the casting machine to fill the first connecting pipe 25 with the PVC solution inside the casting machine. The solution flows through the first connecting pipe 25 into the second connecting pipe 26, and then is injected into the second mold 27. When the solution is almost full of the second mold 27, start the stamping pump 19.

[0041] Gas-assisted molding: The press pump 19 transmits gas to the first air pipe 21. The gas is then diverted through the first air pipe 21 to the second air pipes 23 on both the upper and lower sides, and then enters the first connecting pipe 25 through the second air pipe 23 and the third air pipe 24. The blowing of the gas causes the PVC solution to completely fill the space between the first mold 13 and the second mold 27. During this process, due to the air pressure and the compression of the PVC solution, the mounting cylinder 15 installed inside the first mold 13 cannot push open the flap 18 connected by a hinge at one end, thereby preventing the solution from entering the interior of the mounting cylinder 15 and ensuring that the PVC railing is initially formed between the first mold 13 and the second mold 27.

[0042] Mold separation and semi-shell adsorption

[0043] Mold Separation: After the PVC solution cools, the servo motor 35 is started. The servo motor 35 rotates counterclockwise, driving the first gear 31 to rotate counterclockwise via the second synchronous belt drive assembly 33. The first gear 31, through the first synchronous belt drive assembly 32 and its meshing with the first rack 29, causes the two first racks 29 to move up and down respectively, thereby driving the second mold 27 to move up and down. The second mold 27 drives the sliding rod 28 to slide up and down inside the support base 11, increasing the stability of the device. At this time, the second mold 27 is not fully opened, allowing the first mold 13 to be removed from inside the second mold 27.

[0044] Semi-shell adsorption: After the first mold 13 is removed, the stamping pump 19 is started to draw in air. Due to the action of the third valve inside the third air pipe 24, gas cannot be drawn out here, preventing the PVC solution from flowing back into the second air pipe 23 from the third air pipe 24. The gas inside the first air pipe 21 is drawn out to form a negative pressure, which in turn creates a negative pressure inside the first mold 13. Under the action of negative pressure, the first mold 13 moves the mounting plate 16 from both sides to the middle. The mounting plate 16 drives the mounting cylinder 15 to move synchronously. The first spring 17 is compressed by force, the flap 18 closes, and the mounting cylinder 15 slides into the mounting plate 14. Finally, the first mold 13 adsorbs the semi-shell.

[0045] Heating and secondary molding

[0046] Heating preparation: After the adsorption half-shell is completed, cylinder 45 is activated, which drives the pneumatic rod 12 to extend, causing the first mold 13 for adsorbing the half-shell and the heating plate 43 fixed to its side wall to move from left to right. When the heating plate 43 moves to the third mold 37, the servo motor 35 is activated again.

[0047] Heating process: The servo motor 35 rotates counterclockwise, driving the second gear 34 to rotate counterclockwise via the second synchronous belt drive assembly 33. The second gear 34 meshes with the second rack 36, causing the second rack 36 to move from both sides towards the center, thereby causing the third mold 37 to move from both sides towards the center, clamping the heating plate 43. At this time, the heating plate 43 heats the third mold 37. Afterward, the servo motor 35 drives the second synchronous belt drive assembly 33 clockwise, causing the third mold 37 to move from the center to both sides. The cylinder 45 is activated again, driving the first mold 13 to move from left to right to the third mold 37. The third mold 37 clamps the first mold 13, using the heat transferred from the heating plate 43 to heat the half-shell, bringing the half-shell to a semi-melted state.

[0048] Demolding and Finished Product

[0049] Demolding preparation: After the half-shell is heated to a semi-melted state, the stamping pump 19 is restarted to spray gas. The gas pressure causes the flap 18 to open, and the gas is ejected, releasing the half-shell from its adhesion to the side wall of the first mold 13. At the same time, gas is ejected from the third air pipe 24 to spray out the residual solution inside the first connecting pipe 25, preventing the solution from solidifying inside the pipe. Subsequently, the third mold 37 moves from the middle to both sides, and the half-shell adheres to the inside of the third mold 37.

[0050] Demolding: Restart the stamping pump 19 to move the first mold 13 from right to left to its maximum stroke, returning it to the space between the third molds 37. Close the third mold 37 again, combining the two halves into a complete railing. Finally, open the third mold 37. When the railing contacts the top plate 39 fixed to one end of the fixing rod 38 inside the third mold 37, the top plate 39, under the action of the second spring 41, pushes the railing out of the third mold 37, completing the demolding operation and obtaining the finished PVC railing.

[0051] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A PVC guardrail automatic production equipment, comprising a supporting base (11), characterized in that, The top of the support base (11) is fixedly installed with a forming mechanism, which comprises a gas cylinder (45); The gas cylinder (45) is fixedly installed on the top of the support base (11), and the output end of the gas cylinder (45) is fixedly installed with a pneumatic rod (12). The end of the pneumatic rod (12) away from the gas cylinder (45) is fixedly installed with a first mold (13). The inside of the first mold (13) is fixedly installed with a mounting plate (14). The end of the mounting plate (14) close to the first mold (13) is fixedly installed with a first spring (17). The end of the first spring (17) away from the mounting plate (14) is fixedly installed with a mounting disc (16). The inside of the mounting disc (16) is fixedly installed with a mounting cylinder (15). The end of the mounting cylinder (15) away from the mounting plate (14) is hingedly connected with a flap (18). The side wall of the first mold (13) is fixedly installed with a heating plate (43). The mounting cylinder (15) is slidingly installed in the first mold (13). The side wall of the support base (11) is fixedly installed with a stamping pump (19). The output end of the stamping pump (19) is fixedly installed with a first air pipe (21). The end of the first air pipe (21) away from the stamping pump (19) is fixedly installed with a U-shaped pipe (22). The inside of the left pipe of the U-shaped pipe (22) is provided with a first valve. The U-shaped pipe (22) is fixedly installed with the first mold (13). The upper and lower sides of the first air pipe (21) are fixedly installed with a second air pipe (23). The inside of each of the two second air pipes (23) is provided with a second valve. The ends of the two third air pipes (24) away from the second air pipes (23) are fixedly installed with a first connecting pipe (25). The inside of each of the two first connecting pipes (25) is slidingly installed with a second connecting pipe (26). The ends of the two first connecting pipes (25) away from the second connecting pipes (26) are fixedly installed with a pouring machine. The support base (11) is slidingly installed with a second mold (27). The end of the second mold (27) away from the first mold (13) is fixedly installed with a sliding rod (28).

2. The automatic PVC guardrail production equipment according to claim 1, characterized in that, The sliding rod (28) is slidingly installed in the support base (11). The side wall of the second mold (27) is fixedly installed with a first rack (29). The first rack (29) is slidingly installed in the support base (11).

3. The automatic PVC guardrail production equipment according to claim 2, characterized in that, The side wall of the first rack (29) is meshingly installed with a first gear (31). The first gear (31) is rotatably installed on the side wall of the support base (11). The side wall of the first gear (31) is drivingly installed with a first synchronous belt transmission assembly (32).

4. The automatic PVC guardrail production device according to claim 3, characterized in that, The first gear (31) side wall transmission is installed with the second synchronous belt transmission assembly (33), the support base (11) side wall is fixedly installed with the servo motor (35), the servo motor (35) output shaft rotation is installed in support base (11) side wall, the servo motor (35) output shaft side wall is drivenly installed with the second synchronous belt transmission assembly (33).

5. The automatic PVC guardrail production device according to claim 4, characterized in that, The second synchronous belt transmission assembly (33) is drivenly installed with the second gear (34) inside, the second gear (34) is rotatably installed on the side wall of the support base (11), the second gear (34) side wall is meshedly installed with the second rack (36), the second rack (36) side wall is fixedly installed with the third mold (37).

6. The automatic PVC guardrail production device according to claim 5, characterized in that, The fixed rod (38) is slidably installed in the third mold (37), one end of the fixed rod (38) close to the third mold (37) is fixedly installed with the top plate (39), the support base (11) side wall is fixedly installed with the connecting plate (42), the fixed rod (38) is slidably installed in the connecting plate (42), one end of the connecting plate (42) away from the second mold (27) is fixedly installed with the second spring (41), one end of the second spring (41) away from the connecting plate (42) is fixedly installed with the fixed rod (38).

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