Pre-cooling device used before plastic pipe forming

Abstract

The invention discloses a pre-cooling device used before plastic pipe forming, and relates to the technical field of plastic pipe production. The mold comprises a supporting shell frame, a fixed side plate is fixedly arranged on one side of the top end of the supporting shell frame, a cooling mold body is arranged in the middle of the top end of the supporting shell frame, a turnover disassembly assembly is arranged between the fixed side plate and the cooling mold body, and a reciprocating swing assembly is arranged between the cooling mold body and the supporting shell frame. Two symmetrically distributed cooling assemblies are arranged in the cooling mold body; by arranging the reciprocating swing assembly and the cooling assembly, a plastic melt enters the rotary cooling frames, the plastic melt is divided through the oil cooling body, meanwhile, the plastic melt is cooled through cooling oil circulation, and the reciprocating swing assembly drives the two rotary cooling frames to synchronously and reversely rotate in a reciprocating mode; and the oil cooling body is in uniform contact with the plastic melt, so that different local temperatures are avoided, and the cooling uniformity and stability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic pipe production, in particular to a pre-cooling device before plastic pipe molding. Background Art

[0002] Plastic pipe is a tubular product made of plastic material, which is widely used in various industries, such as construction, agriculture, chemical industry, water supply and drainage, etc. The main characteristics of plastic pipe include light weight, corrosion resistance, wear resistance, easy installation and maintenance, etc. In the production process of plastic pipe profile, it is necessary to put the dried plastic particles into the extruder, heat them to a molten state, and extrude the molten plastic through a screw extruder to form the initial shape of the pipe. The extruded thermoplastic plastic pipe is cooled by a cooling water tank to make it solidify quickly. The cooled pipe passes through a cutting machine and is cut according to the set length to form a finished pipe. When producing large and thick-walled plastic pipes, the hot-melt plastic will become soft, and the flexible plastic will sag during the extrusion process, which will lead to uneven thickness of the pipe wall and increase the loss of raw materials. Secondly, the traditional cooling device is inconvenient to disassemble and install. In view of the above problems, the inventor proposes a pre-cooling device before plastic pipe molding to solve the above problems. Summary of the invention

[0003] In order to solve the problem of uniform cooling of plastic melt and easy disassembly and cleaning, the purpose of the present invention is to provide a pre-cooling device for plastic pipes before molding.

[0004] In order to solve the above technical problems, the present invention adopts the following technical scheme: a pre-cooling device for plastic pipes before forming, comprising a supporting shell frame, a fixed side plate is fixedly provided on one side of the top of the supporting shell frame, a cooling mold body is provided in the middle of the top of the supporting shell frame, a folding and disassembly assembly is provided between the fixed side plate and the cooling mold body, an internal fixed plate is fixedly provided inside the supporting shell frame, a reciprocating swinging assembly is provided between the cooling mold body and the supporting shell frame, two symmetrically distributed cooling assemblies are provided in the cooling mold body, an oil temperature machine is fixedly provided on the side of the fixed side plate away from the cooling mold body, a feeding connector is provided on one side of the cooling mold body, and a discharging connector is provided on the other side of the cooling mold body.

[0005] Preferably, the reciprocating swing assembly includes a driving shaft, which is rotatably mounted on an internal fixed plate, a rotating rod is fixedly provided at the bottom end of the driving shaft, a fixed shaft is fixedly provided at the middle of the supporting shell frame, a swing rod is rotatably provided on the outer wall of the fixed shaft, and the rotating rod is slidably connected to the swing rod, two symmetrically distributed No. 1 guide rails are fixedly provided in the supporting shell frame, a sliding block is slidably provided on the No. 1 guide rail, a fixed column is fixedly provided at the top of the sliding block, and the fixed column is slidably connected to the swing rod, a top block is fixedly provided at the top of the fixed column, a motor is fixedly provided at the top of the internal fixed plate, and the motor and the driving shaft are transmission connected through a pulley transmission group.

[0006] Preferably, the folding and disassembly assembly includes two symmetrically distributed arc-shaped guide rods, and the two arc-shaped guide rods are fixedly mounted on the fixed side plate close to the cooling mold body. An extension plate is slidably provided on the arc-shaped guide rod, and a folding arc-shaped frame used in conjunction with the cooling mold body is fixedly provided on the extension plate. An electric cylinder is rotatably provided on the top of the built-in fixed plate, and the driving end of the electric cylinder is rotatably connected to the extension plate.

[0007] Preferably, the cooling assembly includes a rotating cooling frame, which is rotatably installed in a cooling mold, and two symmetrically distributed oil bins are fixedly provided on the outer wall of the rotating cooling frame, and a plurality of symmetrically distributed oil cooling bodies are provided between the two oil bins, and the oil cooling bodies penetrate the rotating cooling frame, and an oil outlet pipe is fixedly provided on the top of the oil bin, and an oil inlet pipe is fixedly provided on the bottom of the oil bin, and both the oil outlet pipe and the oil inlet pipe are connected to the oil temperature machine through a hose.

[0008] Preferably, a swing guide lower groove used in conjunction with the oil inlet pipe is opened at the bottom end of the cooling mold body, two symmetrically distributed guide plates are fixedly provided on one side of the bottom end of the cooling mold body close to the swing guide lower groove, a swing frame is slidably provided between the two guide plates, a push rod is rotatably provided on one side of the swing frame close to the top block, and the other end of the push rod is rotatably connected to the top block.

[0009] Preferably, a moving ring is fixedly provided at both ends of the outer wall of the rotating cooling frame, a stationary ring is rotatably provided on the moving ring, a sealing ring is sleeved on the outer wall of the stationary ring, a sealing ring is provided between the moving ring and the stationary ring, an annular lower groove used in conjunction with the sealing ring is provided on the inner wall of the cooling mold body, and an annular upper groove corresponding to the annular lower groove is provided on the inner wall of the folded arc frame.

[0010] Preferably, a swinging guide upper groove used in conjunction with the oil outlet pipe is opened on the folded arc frame, four symmetrically distributed No. 2 connecting plates are fixedly provided on the side of the folded arc frame away from the expansion plate, and a No. 1 connecting plate used in conjunction with the No. 2 connecting plate is fixedly provided on the outer wall of the cooling mold body, and the No. 1 connecting plate and the No. 2 connecting plate are fixed by bolts.

[0011] Preferably, the guide plate is provided with an arc-shaped guide groove corresponding to the swing guide lower groove, and two arc-shaped guide grooves are symmetrically distributed. A guide bolt used in conjunction with the arc-shaped guide groove is fixedly provided on the outer wall of the swing frame, and the guide bolt slides in the arc-shaped guide groove.

[0012] Preferably, the expansion plate is rotatably provided with three rotating shafts distributed in a circular array on one side close to the arc-shaped guide rod, a guide wheel is fixedly sleeved on the outer wall of the rotating shaft, and the guide wheel is slidably connected to the arc-shaped guide rod.

[0013] Preferably, a feed diversion orifice plate is fixedly provided on the inner wall of the cooling mold body close to the feed connector, and a discharge diversion orifice plate is fixedly provided on the inner wall of the cooling mold body close to the discharge connector.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention provides a reciprocating swing component and a cooling component, so that the plastic melt enters the rotating cooling frame, the plastic melt is diverted by the oil cooler and the plastic melt is cooled by the cooling oil circulation. The reciprocating swing component drives the two rotating cooling frames to reciprocate synchronously in the opposite direction, so that the oil cooler is in uniform contact with the plastic melt, avoiding local temperature differences and improving cooling uniformity and stability.

[0016] 2. The present invention provides a cooling assembly and a folding and disassembling assembly, so that the folding and disassembling assembly drives the folding arc frame to move upward and flip open, and the rotating cooling frame is inserted into the corresponding swing frame through the oil inlet pipe. At this time, the sealing ring sleeved on the static ring fits in the corresponding annular lower groove and annular upper groove in the cooling mold body and the folding arc frame, which is simple to operate and improves the disassembly and maintenance efficiency;

[0017] 3. The present invention can make the rotating cooling frame rotate while being sealed in the cooling mold body and the folded arc frame by setting the dynamic ring, the static ring and the sealing ring, thereby preventing the plastic melt from leaking from the swing guide lower groove and the swing guide upper groove, and improving the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the cooling mold body split structure in the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the supporting shell frame and the fixed side plate in the present invention;

[0022] Figure 4 It is a structural schematic diagram of the folding and disassembling assembly in the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the rotating cooling frame in the present invention;

[0024] Figure 6 It is a structural schematic diagram of the reciprocating swing assembly in the present invention;

[0025] Figure 7 It is a schematic diagram of the unfolded structure of the folded arc frame in the present invention;

[0026] Figure 8 It is a schematic diagram of the structure of the guide plate and the swing frame in the present invention;

[0027] Fig. 9 It is a schematic diagram of the structure of the supporting shell frame, the fixed side plate and the cooling mold body in the present invention;

[0028] Fig.10 for Figure 5 A schematic diagram of the structure enlargement at the center A;

[0029] Fig.11 for Figure 6 A magnified schematic diagram of the structure at point B in the middle.

[0030] In the figure: 1, supporting shell frame; 2, fixed side plate; 3, cooling mold body; 301, feed diverter hole plate body; 302, discharge diverter hole plate body; 303, swing guide lower groove; 304, No. 1 connecting plate; 305, annular lower groove; 4, folding and disassembling assembly; 401, arc guide rod; 402, folding arc frame; 403, expansion plate; 404, electric cylinder; 405, rotating shaft; 406, guide wheel; 407, swing guide upper groove; 408, No. 2 connecting plate; 409, annular upper groove; 5, built-in fixed plate; 6, reciprocating swing assembly; 601, drive shaft; 602, 603, 604, 605, 606, 607, 608, 609, 601, 601, 602, 603, 604, 605, 606, 607, 608, 609, 609, 601 ... 02. Rotating rod; 603. Fixed shaft; 604. Swinging rod; 605. Guide rail No. 1; 606. Sliding block; 607. Fixed column; 608. Top block; 609. Push rod; 610. Guide plate; 611. Swinging frame; 612. Arc guide groove; 613. Guide bolt; 614. Motor; 7. Cooling assembly; 701. Rotating cooling frame; 702. Oil bin; 703. Oil cooler; 704. Oil outlet pipe; 705. Oil inlet pipe; 706. Moving ring; 707. Static ring; 708. Sealing ring; 8. Oil temperature machine; 9. Feed connector; 10. Discharge connector. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example: Figure 1-11 As shown, the present invention provides a technical solution: a pre-cooling device for plastic pipes before molding, comprising a supporting shell frame 1, a fixed side plate 2 is fixedly provided on one side of the top of the supporting shell frame 1, a cooling mold body 3 is provided in the middle of the top of the supporting shell frame 1, a folding and disassembly component 4 is provided between the fixed side plate 2 and the cooling mold body 3, an internal fixed plate 5 is fixedly provided inside the supporting shell frame 1, a reciprocating swinging component 6 is provided between the cooling mold body 3 and the supporting shell frame 1, two symmetrically distributed cooling components 7 are provided in the cooling mold body 3, an oil temperature machine 8 is fixedly provided on the side of the fixed side plate 2 away from the cooling mold body 3, a feeding connector 9 is provided on one side of the cooling mold body 3, and a discharging connector 10 is provided on the other side of the cooling mold body 3.

[0033] The reciprocating swing component 6 includes a driving shaft 601, which is rotatably mounted on the built-in fixed plate 5. A rotating rod 602 is fixedly arranged at the bottom end of the driving shaft 601. A fixed shaft 603 is fixedly arranged in the middle of the supporting shell frame 1. A swing rod 604 is rotatably arranged on the outer wall of the fixed shaft 603, and the rotating rod 602 is slidably connected to the swing rod 604. Two symmetrically distributed No. 1 guide rails 605 are fixedly arranged in the supporting shell frame 1. A sliding block 606 is slidably arranged on the No. 1 guide rail 605. A fixed column 607 is fixedly arranged at the top of the sliding block 606, and the fixed column 607 is slidably connected to the swing rod 604. A top block 608 is fixedly arranged at the top of the fixed column 607. A motor 614 is fixedly arranged at the top of the built-in fixed plate 5, and the motor 614 is connected to the driving shaft 601 through a pulley transmission group.

[0034] By adopting the above technical solution, the two sliding blocks 606 can slide synchronously in opposite directions.

[0035] The folding and disassembly assembly 4 includes two symmetrically distributed arc-shaped guide rods 401, and the two arc-shaped guide rods 401 are fixedly installed on the side of the fixed side plate 2 close to the cooling mold body 3. An extension plate 403 is slidably provided on the arc-shaped guide rod 401, and a folding arc-shaped frame 402 used in conjunction with the cooling mold body 3 is fixedly provided on the extension plate 403. An electric cylinder 404 is rotatably provided on the top of the built-in fixed plate 5, and the driving end of the electric cylinder 404 is rotatably connected to the extension plate 403.

[0036] By adopting the above technical solution, the electric cylinder 404 pushes the expansion plate 403 to move under the guidance of the arc-shaped guide rod 401.

[0037] The cooling assembly 7 includes a rotating cooling frame 701, which is rotatably installed in the cooling mold 3. Two symmetrically distributed oil bins 702 are fixedly provided on the outer wall of the rotating cooling frame 701. A number of symmetrically distributed oil cooling bodies 703 are provided between the two oil bins 702, and the oil cooling bodies 703 penetrate the rotating cooling frame 701. An oil outlet pipe 704 is fixedly provided at the top of the top oil bin 702, and an oil inlet pipe 705 is fixedly provided at the bottom of the bottom oil bin 702. The oil outlet pipe 704 and the oil inlet pipe 705 are both connected to the oil temperature machine 8 through a hose.

[0038] By adopting the above technical solution, the cooling oil is made to circulate in one direction in the oil cooling body 703 .

[0039] A swing guide lower groove 303 is provided at the bottom end of the cooling mold 3 for use with the oil inlet pipe 705. Two symmetrically distributed guide plates 610 are fixedly provided on one side of the bottom end of the cooling mold 3 near the swing guide lower groove 303. A swing frame 611 is slidably provided between the two guide plates 610. A push rod 609 is rotatably provided on one side of the swing frame 611 near the top block 608, and the other end of the push rod 609 is rotatably connected to the top block 608.

[0040] By adopting the above technical solution, the push rod 609 pushes the swing frame 611 to move under the guidance of the guide plate 610.

[0041] A moving ring 706 is fixedly provided at both ends of the outer wall of the rotating cooling frame 701, a stationary ring 707 is rotatably provided on the moving ring 706, a sealing ring 708 is sleeved on the outer wall of the stationary ring 707, a sealing ring 708 is provided between the moving ring 706 and the stationary ring 707, an annular lower groove 305 used in conjunction with the sealing ring 708 is provided on the inner wall of the cooling mold body 3, and an annular upper groove 409 corresponding to the annular lower groove 305 is provided on the inner wall of the folded arc frame 402.

[0042] By adopting the above technical solution, the rotating cooling frame 701 is rotated while being sealed in the cooling mold 3, thereby preventing the plastic melt from leaking out of the swing guide upper groove 407 and the swing guide lower groove 303.

[0043] A swinging guide upper groove 407 for use with the oil outlet pipe 704 is provided on the folded arc frame 402, four symmetrically distributed No. 2 connecting plates 408 are fixedly provided on the side of the folded arc frame 402 away from the expansion plate 403, and a No. 1 connecting plate 304 for use with the No. 2 connecting plate 408 is fixedly provided on the outer wall of the cooling mold body 3, and the No. 1 connecting plate 304 and the No. 2 connecting plate 408 are fixed by bolts.

[0044] By adopting the above technical solution, the oil outlet pipe 704 slides in the swing guide upper groove 407.

[0045] The guide plate 610 is provided with an arc guide groove 612 corresponding to the swing guide lower groove 303, and there are two symmetrically distributed arc guide grooves 612. A guide bolt 613 used in conjunction with the arc guide groove 612 is fixed on the outer wall of the swing frame 611, and the guide bolt 613 slides in the arc guide groove 612.

[0046] By adopting the above technical solution, the swing frame 611 is moved under the guidance of the arc-shaped guide groove 612 through the guide bolt 613 .

[0047] The expansion plate 403 is rotatably provided with three rotating shafts 405 distributed in a circular array on one side close to the arc-shaped guide rod 401 . A guide wheel 406 is fixedly sleeved on the outer wall of the rotating shaft 405 , and the guide wheel 406 is slidably connected to the arc-shaped guide rod 401 .

[0048] By adopting the above technical solution, the expansion plate 403 is moved under the guidance of the arc-shaped guide rod 401 through the guide wheel 406 .

[0049] A feed diversion orifice plate 301 is fixedly provided on one side of the inner wall of the cooling mold body 3 close to the feed connector 9 , and a discharge diversion orifice plate 302 is fixedly provided on one side of the inner wall of the cooling mold body 3 close to the discharge connector 10 .

[0050] By adopting the above technical solution, the plastic melt is broken up and merged when passing through the feed diversion orifice plate body 301 and the discharge diversion orifice plate body 302 .

[0051] Working principle: First, connect the feed connector 9 to the discharge end of the plastic melting machine, connect the discharge connector 10 to the plastic pipe extrusion die, control and open the oil temperature machine 8, and let the cooling oil enter the bottom oil bin 702 from the oil inlet pipe 705 through the oil temperature machine 8. The cooling oil in the bottom oil bin 702 enters the top oil bin 702 through the oil cooling body 703. The cooling oil in the top oil bin 702 is discharged through the oil outlet pipe 704 and flows back to the oil temperature machine 8 to realize the independent circulation of the cooling oil. The cooling oil temperature is independently adjusted by the oil temperature machine 8. The plastic melt enters the cooling die 3 from the feed connector 9 through the feed diverter plate 301 and passes through the two After the cooling frame 701 is rotated, it passes through the discharging diversion hole plate body 302 and is discharged from the discharging connector 10 into the plastic pipe extrusion mold. When the plastic melt passes through the rotating cooling frame 701, part of the heat is taken away by the cooling oil circulation to reduce the temperature of the plastic melt. At the same time, the motor 614 is controlled to be turned on. The driving end of the motor 614 drives the driving shaft 601 to rotate slowly through the pulley transmission group. The driving shaft 601 drives the swinging rod 604 to swing back and forth with the fixed shaft 603 as the axis through the rotating rod 602. The swinging rod 604 pushes the corresponding sliding block 606 and the top block 608 on the No. 1 guide rail 605 through two fixed columns 607. The two top blocks 608 move back and forth under the guidance of the corresponding guide plate 610. The top blocks 608 move in opposite directions. During the movement, the top blocks 608 push the swing frame 611 to move back and forth under the guidance of the corresponding guide plate 610 through the push rod 609. The swing frame 611 drives the rotating cooling frame 701 to reciprocate in the cooling mold 3 through the oil inlet pipe 705. The two rotating cooling frames 701 reciprocate synchronously in the opposite direction so that the oil cooling body 703 can be more evenly contacted with the plastic melt. When the rotating cooling frame 701 and the interior of the cooling mold 3 need to be cleaned after the production of the plastic pipe is completed, the fixing bolts in the No. 1 connecting plate 304 and the No. 2 connecting plate 408 are manually tightened. Take it out, and at the same time, discharge the cooling oil in the oil tank 702 and the oil cooling body 703 through the oil temperature machine 8, and remove the hoses at the connection between the oil temperature machine 8 and the oil inlet pipe 705 and the oil outlet pipe 704, control to open the electric cylinder 404, and the driving end of the electric cylinder 404 extends to push the folded arc frame 402 to rise under the guidance of the arc guide rod 401, so that the oil outlet pipe 704 is separated from the swing guide upper groove 407 and then flipped 90°. The connection between the folded arc frame 402 and the cooling mold body 3 is provided with a sealing strip, and finally the cooling frame 701 is taken out and rotated upward to separate the oil inlet pipe 705 from the swing frame 611. After cleaning, only reverse operation is required to install it.

[0052] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A pre-cooling device for plastic pipes before forming, comprising a supporting shell frame (1), characterized in that: A fixed side plate (2) is fixedly provided on one side of the top end of the supporting shell frame (1), a cooling mold body (3) is provided in the middle of the top end of the supporting shell frame (1), a folding and disassembling assembly (4) is provided between the fixed side plate (2) and the cooling mold body (3), an internal fixed plate (5) is fixedly provided inside the supporting shell frame (1), a reciprocating swing assembly (6) is provided between the cooling mold body (3) and the supporting shell frame (1), two symmetrically distributed cooling assemblies (7) are provided in the cooling mold body (3), an oil temperature machine (8) is fixedly provided on the side of the fixed side plate (2) away from the cooling mold body (3), a feeding connector (9) is provided on one side of the cooling mold body (3), and a discharging connector (10) is provided on the other side of the cooling mold body (3).

2. A pre-cooling device for plastic pipes before forming as claimed in claim 1, characterized in that: The reciprocating swing assembly (6) comprises a driving shaft (601), the driving shaft (601) is rotatably mounted on the built-in fixed plate (5), a rotating rod (602) is fixedly provided at the bottom end of the driving shaft (601), a fixed shaft (603) is fixedly provided in the middle of the supporting shell frame (1), a swing rod (604) is rotatably provided on the outer wall of the fixed shaft (603), and the rotating rod (602) is slidably connected to the swing rod (604), and two rotating rods (602) are fixedly provided in the supporting shell frame (1). A guide rail (605) is symmetrically distributed, a sliding block (606) is slidably provided on the guide rail (605), a fixed column (607) is fixedly provided on the top of the sliding block (606), and the fixed column (607) is slidably connected to the swing rod (604), a top block (608) is fixedly provided on the top of the fixed column (607), a motor (614) is fixedly provided on the top of the built-in fixed plate (5), and the motor (614) is connected to the drive shaft (601) through a pulley transmission group.

3. A pre-cooling device for plastic pipes before forming as claimed in claim 1, characterized in that: The folding and disassembling assembly (4) comprises two symmetrically distributed arc-shaped guide rods (401), the two arc-shaped guide rods (401) are fixedly mounted on a side of the fixed side plate (2) close to the cooling mold body (3), an expansion plate (403) is slidably provided on the arc-shaped guide rod (401), a folding arc-shaped frame (402) used in conjunction with the cooling mold body (3) is fixedly provided on the expansion plate (403), an electric cylinder (404) is rotatably provided on the top end of the built-in fixed plate (5), and a driving end of the electric cylinder (404) is rotatably connected to the expansion plate (403).

4. A pre-cooling device for plastic pipes before forming as claimed in claim 3, characterized in that: The cooling assembly (7) comprises a rotating cooling frame (701), the rotating cooling frame (701) being rotatably mounted in a cooling mold body (3), two symmetrically distributed oil bins (702) being fixedly disposed on an outer wall of the rotating cooling frame (701), a plurality of symmetrically distributed oil cooling bodies (703) being disposed between the two oil bins (702), and the oil cooling bodies (703) passing through the rotating cooling frame (701), an oil outlet pipe (704) being fixedly disposed at the top end of the top oil bin (702), and an oil inlet pipe (705) being fixedly disposed at the bottom end of the bottom oil bin (702), and the oil outlet pipe (704) and the oil inlet pipe (705) being connected to an oil temperature machine (8) via a hose.

5. A pre-cooling device for plastic pipes before forming as claimed in claim 1, characterized in that: The bottom end of the cooling mold body (3) is provided with a swing guide lower groove (303) used in conjunction with the oil inlet pipe (705); two symmetrically distributed guide plates (610) are fixedly provided on one side of the bottom end of the cooling mold body (3) close to the swing guide lower groove (303); a swing frame (611) is slidably provided between the two guide plates (610); a push rod (609) is rotatably provided on one side of the swing frame (611) close to the top block (608), and the other end of the push rod (609) is rotatably connected to the top block (608).

6. A pre-cooling device for plastic pipes before forming as claimed in claim 4, characterized in that: A moving ring (706) is fixedly provided at both ends of the outer wall of the rotating cooling frame (701), a stationary ring (707) is rotatably provided on the moving ring (706), a sealing ring (708) is sleeved on the outer wall of the stationary ring (707), a sealing ring (708) is provided between the moving ring (706) and the stationary ring (707), an annular lower groove (305) used in conjunction with the sealing ring (708) is provided on the inner wall of the cooling mold body (3), and an annular upper groove (409) corresponding to the annular lower groove (305) is provided on the inner wall of the folded arc frame (402).

7. A pre-cooling device for plastic pipes before forming as claimed in claim 3, characterized in that: The folded arc frame (402) is provided with a swing guide upper groove (407) for use with the oil outlet pipe (704), and four symmetrically distributed No. 2 connecting plates (408) are fixedly provided on the side of the folded arc frame (402) away from the expansion plate (403), and the outer wall of the cooling mold body (3) is fixedly provided with a No. 1 connecting plate (304) for use with the No. 2 connecting plate (408), and the No. 1 connecting plate (304) and the No. 2 connecting plate (408) are fixed by bolts.

8. A pre-cooling device for plastic pipes before forming as claimed in claim 5, characterized in that: The guide plate (610) is provided with an arc-shaped guide groove (612) corresponding to the swing guide lower groove (303), and two arc-shaped guide grooves (612) are symmetrically distributed. A guide bolt (613) used in conjunction with the arc-shaped guide groove (612) is fixedly provided on the outer wall of the swing frame (611), and the guide bolt (613) slides in the arc-shaped guide groove (612).

9. A pre-cooling device for plastic pipes before forming as claimed in claim 7, characterized in that: The expansion plate (403) is rotatably provided with three rotating shafts (405) distributed in a circular array on one side close to the arc-shaped guide rod (401); a guide wheel (406) is fixedly sleeved on the outer wall of the rotating shaft (405); and the guide wheel (406) is slidably connected to the arc-shaped guide rod (401).

10. A pre-cooling device for plastic pipes before forming as claimed in claim 1, characterized in that: A feed diversion orifice plate (301) is fixedly provided on the inner wall of the cooling mold body (3) close to the feed connector (9), and a discharge diversion orifice plate (302) is fixedly provided on the inner wall of the cooling mold body (3) close to the discharge connector (10).

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