Extrusion die for plastic pipeline production

Abstract

The utility model relates to the technical field of extrusion molds, and discloses an extrusion mold for plastic pipeline production, which comprises a mold seat, a mold sleeve and a mold core, the mold sleeve is sleeved outside the mold core, both the mold sleeve and the mold core are fixedly connected with the mold seat, raw materials are extruded from a gap between the mold sleeve and the mold core and are molded into a plastic pipe, and the plastic pipe is fixed on the mold seat. A base pipe and a telescopic rod are arranged at the axis of the mold core, an impeller is arranged at the tail end of the outer side of the telescopic rod, a fixing block is arranged in the base pipe, a mounting groove is formed in the position, opposite to the base pipe, in the mold base, and heat dissipation holes are formed in the position, above the mounting groove, in the mold base. Hot air in the plastic pipe is pumped out through the impeller, then enters the mounting groove through the telescopic rod and the base pipe successively and is finally exhausted through the heat dissipation holes to complete heat dissipation of the interior of the plastic pipe, curing of the plastic pipe is accelerated, and the flow speed of the gas on the inner side of the plastic pipe at the mold opening is increased through the fixing block; the inner wall of the plastic pipe at the die orifice is rapidly cooled and cured to prevent deformation.

Description

Technical Field

[0001] The utility model relates to the technical field of extrusion moulds, in particular to an extrusion mould for producing plastic pipes. Background Art

[0002] Plastic pipe production usually involves adding powdered or granular polymers into the extruder barrel. Under the action of the screw or plunger, the polymer moves forward along the screw groove or barrel and gradually melts to become a viscous fluid. It then passes through the gap between the mold sleeve and the mold core at the end of the barrel and is finally cooled and shaped. Continuous operation is possible with high production efficiency.

[0003] However, the plastic tube is not completely solidified when it is just out of the mold, and its texture is soft and easy to deform. In addition, due to the tubular structure and the continuous extrusion operation method, there is a long closed space inside the plastic tube. The heat inside the plastic tube can only accumulate inside the plastic tube and cannot be discharged, which reduces the efficiency of cooling and solidification of the plastic tube and increases the risk of deformation of the plastic tube. Therefore, it is very important to manufacture a mold that can cool the inside of the plastic tube. Utility Model Content

[0004] In view of the shortcomings of the existing pipe extrusion molds mentioned in the background technology during use, the utility model provides an extrusion mold for plastic pipe production. By arranging an impeller in the mold core, the heat inside the plastic pipe out of the mold is extracted, the cooling and solidification of the plastic pipe is accelerated, and the problem of low cooling efficiency caused by the inability to discharge internal heat in the traditional plastic pipe production process is solved.

[0005] The utility model provides the following technical scheme: an extrusion die for producing plastic pipes, comprising a die base, a die sleeve and a die core, wherein the die sleeve is sleeved on the outside of the die core, the die sleeve and the die core are fixedly connected to the die base, raw materials are extruded from the gap between the die sleeve and the die core and formed into a plastic pipe, a base pipe and a telescopic rod are arranged at the axis of the die core, an impeller is arranged inside the telescopic rod, a fixing block is arranged inside the base pipe, a mounting groove is arranged inside the die base opposite to the base pipe, a heat dissipation hole is arranged inside the die base above the mounting groove, hot air in the plastic pipe is extracted by the impeller and then successively enters the mounting groove through the telescopic rod and the base pipe, and is finally discharged from the heat dissipation hole, so as to complete the heat dissipation inside the plastic pipe and accelerate the solidification of the plastic pipe, and the flow rate of the gas inside the plastic pipe is increased by the fixing block, so as to quickly cool and solidify the inner wall of the plastic pipe at the die mouth to prevent deformation.

[0006] Preferably, the outer wall of the inner end of the telescopic rod is fixedly connected to one end of the hydraulic rod I, and the other end of the hydraulic rod I is fixedly connected to the inner wall of the mounting groove. The hydraulic rod I is placed in the space between the outer wall of the base tube and the inner wall of the mold core. The base tube is in a rectangular tube shape and the radial cross-sectional profile of the base tube is smaller than the radial cross-sectional profile of the telescopic rod. The outer end of the base tube is movably sleeved with the telescopic rod, and the inner end of the base tube is hinged to the inner wall of the mold core.

[0007] Preferably, a fixed block is fixedly installed in the middle of the bottom surface of the base tube, the fixed block is sloped and the slope faces the top of the heat dissipation hole, a movable block is movably sleeved inside the base tube inside the fixed block, the movable block has the same shape as the fixed block and the slopes are opposite, a hydraulic rod II is provided on the inner side of the movable block, hinges are fixedly installed at both ends of the hydraulic rod II, and the hydraulic rod II is fixedly connected to the inner end of the movable block and the inner wall of the mounting groove through the hinges.

[0008] Preferably, an air hole is provided on the tube wall of the telescopic rod inside the impeller.

[0009] The utility model has the following beneficial effects:

[0010] 1. The utility model arranges a telescopic rod in the mold core and installs an impeller on the outside of the telescopic rod to extract the heat inside the plastic tube out of the mold, thereby accelerating the cooling and curing of the plastic tube, thereby solving the problem of low cooling efficiency and long curing time caused by the failure to timely discharge the internal heat in the traditional plastic tube production process.

[0011] 2. The utility model increases the gas flow rate on the inner wall of the plastic tube at the die opening by arranging a fixed block and a movable block at the rear side of the impeller, which quickly cools down and solidifies the plastic tube at the die opening, thereby solving the problem of deformation of the plastic tube when it leaves the die in the traditional plastic tube production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the external structure of the utility model;

[0013] Figure 2 This is a cross-sectional view of the utility model;

[0014] Figure 3 For this utility model Figure 2 A partial enlarged view of the middle part;

[0015] Figure 4 For this utility model Figure 2 A partial enlarged view of point B in the middle;

[0016] Figure 5 For this utility model Figure 2 A partial enlarged view of point C in the middle;

[0017] Figure 6 This is an exploded view of the structure of the telescopic rod of the utility model.

[0018] In the figure: 1. mold base; 11. mounting groove; 12. heat dissipation hole; 2. mold sleeve; 3. mold core; 4. base pipe; 5. telescopic rod; 51. air hole; 52. hydraulic rod I; 6. grid plate; 61. motor; 62. impeller; 63. mounting frame; 7. fixed block; 71. movable block; 72. hydraulic rod II; 73. hinge; 8. plastic pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] For ease of understanding, unless otherwise specified, the “outer side” mentioned herein refers to the side in the output direction of the plastic tube 8 , and the “inner side” refers to the side close to the mold base 1 .

[0021] See also Figure 1 An extrusion die for producing plastic pipes includes a die base 1, a die sleeve 2 and a die core 3. The die sleeve 2 is sleeved on the outside of the die core 3. The die sleeve 2 and the die core 3 are fixedly connected to the die base 1. The raw material is extruded from between the die sleeve 2 and the die core 3 to form a plastic pipe 8.

[0022] See also Figure 2 A base tube 4 is provided at the axis of the mold core 3, and a mounting groove 11 is opened inside the mold base 1 opposite the base tube 4. A heat dissipation hole 12 is opened inside the mold base 1 above the mounting groove 11. The heat dissipation hole 12 is used to discharge the hot air in the plastic tube 8 and install the hydraulic device.

[0023] See also Figure 2 , Figure 3 , Figure 5 and Figure 6The core 3 is internally sleeved with a telescopic rod 5, which is in the shape of a round tube. A grid plate 6 is fixedly installed at the outer end of the telescopic rod 5. A motor 61 is provided inside the grid plate 6. The output shaft of the motor 61 is fixedly connected to the impeller 62. A mounting frame 63 is fixedly installed on the outer wall of the motor 61. The mounting frame 63 is fixedly connected to the inner wall of the telescopic rod 5. The grid plate 6 is used to protect the impeller 62 inside. The impeller 62 is used to transfer the hot air inside the plastic pipe 8 to the mold base 1. The tube wall of the telescopic rod 5 inside the motor 61 is provided with an air hole 5. 1. When the air pressure inside the telescopic rod 5 increases, the gas inside the telescopic rod 5 is ejected from the air hole 51 to quickly cool down and solidify the plastic tube 8 with a soft texture on the outer wall of the telescopic rod 5, thereby preventing the plastic tube 8 from sagging and deforming. The outer wall of the inner end of the telescopic rod 5 is fixedly connected to one end of the hydraulic rod I 52, and the other end of the hydraulic rod I 52 is fixedly connected to the inner wall of the mounting groove 11. The hydraulic rod I 52 is placed in the space between the outer wall of the base tube 4 and the inner wall of the mold core 3, and the movement of the telescopic rod 5 and the grid plate 6 is controlled by the hydraulic rod I 52.

[0024] See also Figures 2 to 6 The base tube 4 is in a rectangular tube shape and the radial cross-sectional profile of the base tube 4 is smaller than the radial cross-sectional profile of the telescopic rod 5. The outer end of the base tube 4 is movably sleeved with the telescopic rod 5, and the inner end of the base tube 4 is fixedly connected to the inner wall of the mold core 3. A fixed block 7 is fixedly installed in the middle of the inner bottom surface of the base tube 4. The fixed block 7 is sloped and the slope faces the top of the heat dissipation hole 12. A movable block 71 is movably sleeved inside the base tube 4 inside the fixed block 7. The movable block 71 has the same shape as the fixed block 7 and the slope faces oppositely. When the movable block 71 moves outward, it will simultaneously climb up the slope of the fixed block 7 and reduce the space above the fixed block 7. A hydraulic rod II 72 is provided on the inner side of the movable block 71. Both ends of the hydraulic rod II 72 are fixedly installed with hinges 73. The hydraulic rod II 72 is hinged to the inner end of the movable block 71 and the inner wall of the mounting groove 11 through the hinges 73.

[0025] The usage (working principle) of the utility model is as follows:

[0026] The mold sleeve 2 and the mold core 3 are installed on the mold base 1, and the raw material is extruded from the gap between the mold sleeve 2 and the mold core 3 to form a plastic tube 8. Since the plastic tube 8 has just left the mold and has not been completely solidified, it is easy to deform. The telescopic rod 5 is controlled by the hydraulic rod Ⅰ52 to extend outward.

[0027] The motor 61 is started, and the motor 61 drives the impeller 62 to rotate and pushes the hot air accumulated inside the plastic tube 8 outside the grid plate 6 into the interior of the telescopic rod 5 through the grid plate 6, and the hydraulic rod II 72 is started, and the hydraulic rod II 72 pushes the movable block 71 to move toward the fixed block 7 and climb up the slope of the fixed block 7, the cross-sectional area of ​​the gas flow above the fixed block 7 is reduced, and the air pressure between the outside of the fixed block 7 and the inside of the grid plate 6 is increased, and the gas is ejected from the air hole 51, which has the effect of local rapid cooling of the inner wall of the plastic tube 8 outside the telescopic rod 5, so that the plastic tube 8 at the mold mouth is quickly solidified to prevent the plastic tube 8 that has just been ejected from the mold from bending and deformation, and the hot air accumulated inside continues to enter the installation groove 11 through the narrow channel formed above the fixed block 7, and is discharged from the heat dissipation hole 12 above the installation groove 11, completing the discharge of the heat inside the plastic tube 8 and promoting faster cooling and solidification of the plastic tube 8.

Claims

1. An extrusion die for producing a plastic pipe, comprising a die base (1), a die sleeve (2) and a die core (3), wherein the die sleeve (2) is sleeved on the outside of the die core (3), and the die sleeve (2) and the die core (3) are both fixedly connected to the die base (1), and a raw material is extruded from a gap between the die sleeve (2) and the die core (3) and formed into a plastic pipe (8), characterized in that: A base tube (4) and a telescopic rod (5) are provided at the axis of the mold core (3); an impeller (62) is provided inside the telescopic rod (5); a fixing block (7) is provided inside the base tube (4); a mounting groove (11) is provided inside the mold base (1) opposite the base tube (4); a heat dissipation hole (12) is provided inside the mold base (1) above the mounting groove (11); hot air in the plastic tube (8) is extracted by the impeller (62) and then enters the mounting groove (11) through the telescopic rod (5) and the base tube (4) successively, and is finally discharged from the heat dissipation hole (12), thereby completing the heat dissipation inside the plastic tube (8) and accelerating the solidification of the plastic tube (8); and the flow rate of the gas inside the plastic tube (8) at the mold opening is increased by the fixing block (7), so as to quickly cool down and solidify the inner wall of the plastic tube (8) at the mold opening.

2. The extrusion die for producing a plastic pipe according to claim 1, characterized in that: The telescopic rod (5) is in the shape of a circular tube and is movably sleeved inside the mold core (3); a grid plate (6) is fixedly mounted on the outer end of the telescopic rod (5); a motor (61) is provided on the inner side of the grid plate (6); an output shaft of the motor (61) is fixedly connected to an impeller (62); a mounting frame (63) is fixedly mounted on the outer wall of the motor (61); and the mounting frame (63) is fixedly connected to the inner wall of the telescopic rod (5).

3. The extrusion die for producing a plastic pipe according to claim 1, characterized in that: The outer wall of the inner end of the telescopic rod (5) is fixedly connected to one end of the hydraulic rod I (52), and the other end of the hydraulic rod I (52) is fixedly connected to the inner wall of the mounting groove (11). The hydraulic rod I (52) is arranged in the space between the outer wall of the base tube (4) and the inner wall of the mold core (3). The base tube (4) is in a rectangular tube shape and the radial cross-sectional profile of the base tube (4) is smaller than the radial cross-sectional profile of the telescopic rod (5). The outer end of the base tube (4) is movably sleeved with the telescopic rod (5), and the inner end of the base tube (4) is fixedly connected to the inner wall of the mold core (3).

4. The extrusion die for producing a plastic pipe according to claim 1, characterized in that: A fixed block (7) is fixedly installed in the middle of the bottom surface of the base tube (4); the fixed block (7) is sloped and the slope faces the top of the heat dissipation hole (12); a movable block (71) is movably sleeved inside the base tube (4) inside the fixed block (7); the movable block (71) has the same appearance as the fixed block (7) and the slope faces each other; a hydraulic rod II (72) is provided inside the movable block (71); hinges (73) are fixedly installed at both ends of the hydraulic rod II (72); the hydraulic rod II (72) is respectively hinged to the inner end of the movable block (71) and the inner wall of the mounting groove (11) through the hinge (73).

5. The extrusion die for producing plastic pipes according to claim 2, characterized in that: An air hole (51) is provided on the tube wall of the telescopic rod (5) inside the impeller (62).

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