A production process for PVC pipes

Abstract

The present invention relates to the field of pipeline production, and more specifically to a production process of PVC pipes. It includes the following steps: S1: Take PVC resin and heat-melt the PVC resin; S2: Add additives to the PVC resin and stir; S3: Put the PVC resin added with additives into an extruder to extrude and granulate; S4: Heat-melt the produced granules, and the melted PVC raw material is extruded into a tubular shape in a PVC pipe extruder; S5: Make the extruded PVC pipe pass through a cooling device; S6: The cooling device performs secondary water cooling on the PVC pipe to make the PVC pipe solidify and take shape. The stabilizer, lubricant, filler and pigment. The PVC pipe extruder is a twin-screw extruder. The PVC resin is SG-5 type resin.

Description

Technical Field

[0001] The present invention relates to the field of pipeline production, and more specifically to a production process for PVC pipes. Background Art

[0002] PVC pipes are plastic pipes, and the main material is polyvinyl chloride, which is extruded by hot pressing after being compounded with polyvinyl chloride resin, stabilizers, lubricants, etc. PVC pipes have good strength, low price, and also have properties such as heat insulation, moisture resistance, moisture retention, and flame retardancy. Therefore, their application areas are relatively wide. When extruding PVC pipes, it is necessary to cool the pipe body to help the PVC pipes solidify and take shape. The traditional cooling method is to directly pour water on the upper side of the pipeline, and this cooling method cannot cool the PVC pipes comprehensively. Summary of the Invention

[0003] To overcome the deficiencies of the prior art, the present invention provides a production process for PVC pipes, and its beneficial effect is that the PVC pipes can be cooled by water for the second time through a cooling device to make the PVC pipes solidify and take shape.

[0004] A production process for PVC pipes includes the following steps:

[0005] S1: Take PVC resin and heat and melt the PVC resin;

[0006] S2: Add additives to the PVC resin and stir;

[0007] S3: Put the PVC resin added with additives into an extruder to extrude and granulate;

[0008] S4: Heat and melt the produced granules, and the melted PVC raw material is extruded into a tubular shape in a PVC pipe extruder;

[0009] S5: Make the extruded PVC pipe pass through the cooling device;

[0010] S6: The cooling device cools the PVC pipe by water for the second time to make the PVC pipe solidify and take shape.

[0011] The additives are stabilizers, lubricants, fillers, and pigments.

[0012] The PVC pipe extruder is a twin-screw extruder.

[0013] The PVC resin is SG-5 type resin. Brief Description of the Drawings

[0014] The following further elaborates on the present invention in detail with reference to the drawings and specific implementation methods.

[0015] Figure 1 [[ID=

[0016] Figure 2 Schematic diagram of the structure of the cooling device Figure 1 ;

[0017] Figure 3 Schematic diagram of the structure of the cooling device Figure 2 ;

[0018] Figure 4 Schematic diagram of the structure of the cooling device Figure 3 ;

[0019] Figure 5 Schematic diagram of the structure of the arc-shaped box;

[0020] Figure 6 Schematic diagram of the structure of the ring;

[0021] Figure 7 Schematic diagram of the structure of the translation ring;

[0022] Figure 8 Schematic diagram of the structure of the portal frame;

[0023] Figure 9 Schematic diagram of the structure of the T-shaped frame.

[0024] In the figure: arc-shaped box 101; joint one 102; injection port 103; corrugated pipe 104;

[0025] ring 201; fixing block 202; stop head 203; inclined rod 204; sliding rod 205; bracket 206; brush hair 207; side arm 208;

[0026] translation ring 301; square column 302;

[0027] portal frame 401; joint two 402; hollow bar 403; hinge seat 404; vertical column 405;

[0028] T-shaped frame 501; inclined plane part 502; round rod 503; telescopic rod 504; retaining piece 505; push-pull column 506. Specific implementation method

[0029] A PVC pipe production process, comprising the following steps:

[0030] S1: Take PVC resin and heat and melt the PVC resin;

[0031] S2: Add additives to the PVC resin and stir;

[0032] S3: Put the PVC resin added with additives into an extruder and extrude and granulate;

[0033] S4: The produced pellets are heated and melted, and the melted PVC raw material is extruded into a tube in a PVC pipe extruder;

[0034] S5: passing the extruded PVC pipe through a cooling device;

[0035] S6: The cooling device performs secondary water cooling on the PVC pipe to solidify the PVC pipe.

[0036] The additives are stabilizers, lubricants, fillers and pigments.

[0037] The PVC pipe extruder is a twin-screw extruder.

[0038] The PVC resin is SG-5 type resin.

[0039] like Figure 5 As shown, this example can achieve the effect of multi-directional water spray cooling on the pipeline.

[0040] The cooling device includes four curved boxes 101 arranged in a ring shape. Adjacent curved boxes 101 are connected and communicated via bellows 104. A connector 102 is provided on the upper curved box 101. Multiple injection ports 103 are provided on the inner side of each curved box 101. Cooling water can be introduced at connector 102. The cooling water enters the multiple curved boxes 101 through the multiple bellows 104, passing the pipes to be cooled between the four curved boxes 101. Water is then ejected in multiple directions through the multiple injection ports 103, providing multi-directional cooling of the pipes and improving the cooling effect. Furthermore, the four curved boxes 101 can be expanded or contracted by the four bellows 104, allowing the four curved boxes 101 to be placed on the outside of pipes of different sizes, providing multi-directional cooling of the pipes.

[0041] like Figure 6 As shown, this example can achieve the effect of driving the four arc-shaped boxes 101 to expand or contract.

[0042] Since the left sides of the four arc-shaped boxes 101 are connected to the fixed blocks 202 by screws, each fixed block 202 is welded with a sliding rod 205, and the four sliding rods 205 are respectively slidably connected to the upper and lower front and rear ends of the ring 201, when the four sliding rods 205 slide on the ring 201, they can drive the four fixed blocks 202 and the four arc-shaped boxes 101 to move, thereby driving the four arc-shaped boxes 101 to expand or contract.

[0043] like Figure 6 As shown, this example can achieve the effect of making the four arc-shaped boxes 101 tend to converge with each other.

[0044] Since compression spring 1 is sleeved on each of the four slide rods 205, and compression spring 1 is located between the ring 201 and the corresponding fixed block 202, the four compression springs 1 respectively apply force to the four fixed blocks 202 and the four arc boxes 101 to move closer to each other, so that the four arc boxes 101 tend to retract into each other.

[0045] like Figure 6-7 As shown, this example can achieve the effect of driving four sliding rods 205 and four arc-shaped boxes 101 to move outward.

[0046] Since the outer ends of the four sliding rods 205 are connected to the oblique rods 204 by screws, the left end of the oblique rods 204 is expanded outward, the translation ring 301 is coaxially arranged with the circular ring 201, and the translation ring 301 is pressed on the left side of the four oblique rods 204. Two square columns 302 are welded on the upper part of the translation ring 301. The two square columns 302 are both slidably connected to the upper part of the circular ring 201 in the left and right directions. The upper part of the circular ring 201 is threadedly connected with a fastening screw 1, which presses on the square column 302. The square pillars 302 are fixed on the top, and the two square pillars 302 can be manually driven to move left and right, thereby driving the translation ring 301 to move left and right. When the translation ring 301 is driven to move to the right, the translation ring 301 is pressed against the four oblique rods 204, thereby driving the four oblique rods 204 to move outward, thereby driving the four sliding rods 205 and the four arc boxes 101 to move outward; when the translation ring 301 moves to the left, the four arc boxes 101 are moved closer to each other due to the action of the compression spring.

[0047] like Figure 6 As shown, this example can achieve the effect of preventing the translation ring 301 from escaping from the range of the tilt rod 204.

[0048] Since a stopper 203 is welded to the left end of the inclined rod 204 and a bracket 206 is welded to the lower side of the ring 201 , the bracket 206 can support the ring 201 . The stopper 203 can prevent the translation ring 301 from escaping from the range of the inclined rod 204 .

[0049] like Figure 6 As shown, this example can achieve the effect of brushing another layer of water on the pipe.

[0050] Since side arms 208 are welded to the front and rear ends of the right side of the ring 201, and multiple bristles 207 are bonded to the opposite sides of the two side arms 208, when the multiple arc boxes 101 spray water to cool the pipeline, the multiple bristles 207 on the two side arms 208 brush on the pipeline, and another layer of water is brushed on the pipeline, further helping to cool the pipeline.

[0051] The cooling device further includes a T-shaped frame 501. The T-shaped frame 501 is connected to the rear side arm 208 by screws. Round bars 503 are welded to both the upper and lower ends on the right side of the T-shaped frame 501. The rear part of the T-shaped frame 501 is slidably connected to the two round bars 503 in the left-right direction. Vertical columns 405 are slidably connected to both the upper and lower ends of the portal frame 401. Hinge seats 404 are welded to the opposite ends of the two vertical columns 405. Two hollow bars 403 are hinged to each hinge seat 404. The two hollow bars 403 located on the front side are hinged to each other, and the two hollow bars 403 located on the rear side are hinged to each other. A plurality of spray holes are provided on the inner side of each hollow bar 403, and a second joint 402 is connected to the outer side of each hollow bar 403.

[0052] As Figure 8-9 shown, this example can achieve the effect of spraying continuously changing water onto the pipeline for secondary cooling of the pipeline.

[0053] When the two vertical columns 405 slide closer to each other, the two hinge seats 404 approach each other, and the four hollow bars 403 rotate relative to each other. At this time, the space between the four hollow bars 403 becomes narrower in the up-down direction and wider in the left-right direction. When the two hinge seats 404 move away from each other, the space between the four hollow bars 403 becomes wider in the up-down direction and narrower in the left-right direction. As a result, the directions of the multiple spray holes on the four hollow bars 403 continuously change, causing the continuously changing water to be sprayed onto the pipeline, making the contact between the cooling water and the pipeline more thorough for secondary cooling of the pipeline. The second joint 402 is used to introduce cooling water into the hollow bar 403.

[0054] A push-pull column 506 is slidably connected to the middle of the portal frame 401 in the front-rear direction. The front part of the push-pull column 506 is rotatably connected to the hinge point of the two hollow bars 403 located on the rear side. The push-pull column 506 is driven to slide by a telescopic rod 504. Stop pieces 505 are welded to the right ends of the two round bars 503. Compression springs II are sleeved on the two round bars 503, and the compression springs II are located between the portal frame 401 and the stop pieces 505. An inclined plane member 502 is welded to the rear end of the push-pull column 506, and an inclined plane is provided on the front side of the inclined plane member 502, and the inclined plane presses against the rear side of the T-shaped frame 501.

[0055] As Figure 8-9 shown, this example can achieve the effect that on the premise of continuously changing the directions of the four hollow bars 403, the four hollow bars 403 will also move left and right.

[0056] When the telescopic rod 504 expands and contracts, it drives the push-pull column 506 to slide back and forth continuously, and then drives the inclined plane member 502 to move back and forth continuously. When the inclined plane member 502 moves forward, the inclined plane presses against the rear side of the T-shaped frame 501. At this time, the inclined plane member 502, the push-pull column 506, and the portal frame 401 are driven to move to the right along the two round rods 503. When the inclined plane member 502 moves backward, due to the elastic force of the second compression spring, the portal frame 401 moves to the left along the two round rods 503. On the premise that the directions of the four hollow bars 403 are constantly changing, the four hollow bars 403 will also move left and right, so that the range of secondary water spray cooling of the four hollow bars 403 is larger.

Claims

1. A production process of PVC pipes, characterized in that, It includes the following steps: S1: Take PVC resin and heat-melt the PVC resin; S2: Add additives to the PVC resin and stir; S3: Put the PVC resin with additives into an extruder for extrusion granulation; S4: Heat-melt the produced granules, and extrude the melted PVC raw material into a tubular shape in a PVC pipe extruder; S5: Make the extruded PVC pipe pass through the cooling device; S6: The cooling device performs secondary water cooling on the PVC pipe to make the PVC pipe solidify and take shape; The cooling device includes an arc box (101). There are four arc boxes (101), and the four arc boxes (101) are arranged in a ring shape. Adjacent two arc boxes (101) are connected and communicated through a corrugated pipe (104). A joint one (102) is arranged on the upper arc box (101), and a plurality of spray nozzles (103) are arranged on the inner side of each arc box (101); Fixing blocks (202) are fixedly connected to the left sides of the four arc boxes (101). A sliding rod (205) is fixedly connected to each fixing block (202). The four sliding rods (205) are respectively slidably connected to the upper, lower, front and rear ends of a ring (201); Compression springs one are sleeved on the four sliding rods (205). The compression springs one are located between the ring (201) and the corresponding fixing blocks (202); The outer ends of the four sliding rods (205) are fixedly connected with inclined rods (204). The left ends of the inclined rods (204) expand outwards. A translation ring (301) is coaxially arranged with the ring (201). The translation ring (301) presses on the left sides of the four inclined rods (204). Two square columns (302) are fixedly connected to the upper part of the translation ring (301). The two square columns (302) are slidably connected to the upper part of the ring (201) in the left-right direction. A fastening screw one is threadedly connected to the upper part of the ring (201), and the fastening screw one presses on the square column (302) to fix the square column (302); A stop head (203) is fixedly connected to the left end of the inclined rod (204). A bracket (206) is welded to the lower side of the ring (201); Side arms (208) are fixedly connected to the front and rear ends on the right side of the ring (201). A plurality of bristles (207) are bonded to the opposite sides of the two side arms (208); The cooling device further includes a T-shaped frame (501). The T-shaped frame (501) is connected to the side arm (208) at the rear side by screws. Round bars (503) are welded to both the upper and lower ends on the right side of the T-shaped frame (501). The rear part of the T-shaped frame (501) is slidably connected to the two round bars (503) in the left-right direction. Vertical columns (405) are slidably connected to both the upper and lower ends of the portal frame (401). Hinge seats (404) are welded to the opposite ends of the two vertical columns (405). Two hollow bars (403) are hinged to each hinge seat (404). The two hollow bars (403) at the front side are hingedly connected to each other, and the two hollow bars (403) at the rear side are hingedly connected to each other. A plurality of spray holes are provided on the inner side of each hollow bar (403). A second joint (402) is connected to the outer side of each hollow bar (403). A push-pull column (506) is slidably connected to the middle of the portal frame (401) in the front-rear direction. The front part of the push-pull column (506) is rotatably connected to the hinge joint of the two hollow bars (403) at the rear side. The push-pull column (506) is driven to slide by a telescopic rod (504). Stop pieces (505) are welded to the right ends of the two round bars (503). Compression springs II are sleeved on the two round bars (503). The compression springs II are located between the portal frame (401) and the stop pieces (505). An inclined plane member (502) is welded to the rear end of the push-pull column (506). An inclined plane is provided on the front side of the inclined plane member (502), and the inclined plane presses against the rear side of the T-shaped frame (501).

2. The production process of a PVC pipe according to claim 1, characterized in that: The additives are: stabilizers, lubricants, fillers, and pigments.

3. A production process of PVC pipes according to claim 1, characterized in that: The PVC pipe extruder is a twin-screw extruder.

4. A production process of PVC pipes according to claim 1, characterized in that: The PVC resin is SG-5 type resin.

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