Pipeline injection molding device and method

Abstract

The invention discloses a pipeline injection molding device and method, and relates to the technical field of injection molding. The injection molding device comprises a fixing table, an injection molding device body is fixed to the top of the fixing table, a nozzle main pipe is fixed to the output end of the injection molding device body, a plurality of nozzle branch pipes are fixed to the side, away from the injection molding device body, of the nozzle main pipe, and a pipeline mold assembly is arranged on the sides, away from the nozzle main pipe, of the nozzle branch pipes; and a heat preservation device is arranged outside the injection molding device main body. Through the arrangement of the heat preservation device, the heat conduction fins, the injection molding device body and the heat preservation ring are matched to drive heat in the heat preservation box to conduct heat preservation or preheating on the nozzle main pipe and the nozzle branch pipe, and heat preservation or preheating can keep the temperature of the nozzle main pipe and the nozzle branch pipe within a proper range; and the situation that the viscosity is increased and the fluidity is poor due to the too low temperature in the material injection process, and the pipeline injection molding quality is affected is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to a pipeline injection molding device and method. Background Art

[0002] The pipe injection molding device is used to produce plastic pipes. The plastic raw material is heated to a molten state through the injection molding process, then injected into the mold, cooled and solidified to form a pipe. This device can achieve efficient and accurate pipe production and is suitable for various industrial manufacturing needs of pipes.

[0003] The Chinese patent with the patent announcement number CN113290775B discloses a plasticizing injection molding device of a venting injection molding machine, which mainly includes an injection molding seat moving cylinder, a guide rail, a barrel screw integral moving cylinder, a barrel screw support seat, a sealing assembly, a thrust bearing group, a screw, a barrel, a plasticizing drive system, a hopper, a heating ring, an exhaust system, an injection sleeve and a supporting structure and a nozzle and other parts. An exhaust hole is opened on the barrel to discharge moisture or volatile substances in the plasticizing process. The plasticized melt flows into the injection sleeve cavity for storage. During injection molding, the screw first moves forward under the action of the screw push cylinder, so that the screw seals the barrel outlet. Then, under the action of the barrel screw integral moving cylinder, the barrel and the screw move forward together, and the melt in the injection sleeve is ejected from the nozzle to form a product. The device structure of this patent is simpler than the plasticizing injection molding device of a general injection molding machine, and the raw material drying equipment is omitted. The screw structure is similar to the screw structure of a single-screw venting extruder, which reduces the processing cost.

[0004] However, the current injection molding device has the following problems: it is inconvenient to preheat or keep warm the injection nozzle of the injection molding device, which easily leads to increased viscosity of the plastic raw material due to too low temperature during the injection process, resulting in poor fluidity and affecting the quality of pipeline injection molding. Therefore, we propose a pipeline injection molding device and method. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a pipeline injection molding device and method, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a pipeline injection molding device, comprising a fixed platform, an injection molding device body is fixed on the top of the fixed platform, a nozzle main pipe is fixed on the output end of the injection molding device body, a plurality of nozzle branch pipes are fixed on the side of the nozzle main pipe away from the injection molding device body, a pipeline mold assembly is arranged on the side of the nozzle branch pipe away from the nozzle main pipe, an insulation device is arranged on the outside of the injection molding device body, the insulation device comprises an insulation box, an insulation ring, a plurality of heat-conducting fins, and a connecting pipe, and the insulation The box is fixed on the outer wall of the pipe mold assembly, the insulation ring is fixed on the outside of the injection molding device body, a plurality of the heat-conducting fins are evenly fixed on the inside of the insulation ring, and the heat-conducting fins are in contact with the outer wall of the injection molding device body, the connecting pipe is fixed between the insulation box and the top of the insulation ring, and the insulation box is connected with the inside of the insulation ring through the connecting pipe, the heat-conducting fins will guide the heat emitted by the injection molding device body to the insulation ring, the heat in the insulation ring will be transferred to the insulation box through the connecting pipe, and the heat in the insulation box will insulate or preheat the nozzle main pipe and the nozzle branch pipe.

[0007] The cam is an L-shaped one-way air inlet nozzle, and the L-shaped one-way air outlet nozzle is a L-shaped one-way air outlet nozzle. The cam is fixed on the outer wall of the heat preservation box, the reciprocating screw is rotatably installed inside the heat preservation box, and the reciprocating screw is fixedly connected to the output end of the motor, the threaded block is threadedly connected to the outside of the reciprocating screw, the toothed plate is fixed to the bottom of the threaded block, and the toothed plate is laterally slidably installed on the outer wall of the nozzle main pipe, the two U-shaped pressure frames are respectively fixed on both sides of the top of the toothed plate, one end of the two folding capsules are respectively fixed on both sides of the inner wall of the heat preservation box, the other ends of the two folding capsules are respectively fixed on the side away from each other of the two U-shaped pressure frames, the two one-way air outlet nozzles are respectively fixed on the side close to each other of the two U-shaped pressure frames, and the U-shaped tube is fixed on the outer wall of the heat preservation box. The L-shaped one-way air inlet nozzle is fixed between the tops of the two folding bags, and the L-shaped one-way air inlet nozzle is fixed on the top of the U-shaped tube, and the L-shaped one-way air inlet nozzle extends to the inside of the connecting tube, and the L-shaped one-way air inlet nozzle is used to control the one-way air intake of the folding bag, and the one-way air outlet nozzle is used to control the one-way air outlet of the folding bag. At the same time, motor one is started, and the output end of motor one drives the reciprocating screw rod to rotate, and the reciprocating screw rod drives the tooth plate to move back and forth laterally along the outer wall of the nozzle main pipe through the threaded block, and the tooth plate drives the U-shaped pressing frame to move along. Every time the tooth plate drives the U-shaped pressing frame away from the inner wall of the insulation box, the U-shaped pressing frame will stretch the folding bag, and the folding bag will suck the hot air in the insulation ring into the folding bag through the U-shaped tube and the L-shaped one-way air inlet nozzle. Every time the tooth plate drives the U-shaped pressing frame to lean against the inner wall of the insulation box, the U-shaped pressing frame will squeeze the folding bag, and the hot air inside the folding bag will be sprayed into the insulation box through the one-way air outlet nozzle.

[0008] According to the above technical solution, the pipeline mold assembly includes a U-shaped frame, a hydraulic cylinder 1, a hydraulic cylinder 2, a movable mold, and a fixed mold. The U-shaped frame is fixed on the top of the fixed platform, the hydraulic cylinder 1 is fixed on the outer wall of the U-shaped frame away from the main body of the injection molding device, the movable mold is fixed on the telescopic end of the hydraulic cylinder 1, the hydraulic cylinder 2 is fixed on the front side of the U-shaped frame, and the fixed mold is fixed on the inner wall of the U-shaped frame close to the main body of the injection molding device.

[0009] According to the above technical solution, a pipe blocking device is arranged inside the nozzle main pipe, and the pipe blocking device includes a plurality of I-shaped wheels, a plurality of cross rods, a plurality of plugs, a U-shaped connecting plate, two pull ring plates, and two threaded rods. A plurality of I-shaped wheels are evenly and equidistantly rotated and installed on the side of the nozzle main pipe close to the injection molding device body, and the I-shaped wheels penetrate the outer wall of the nozzle main pipe, a plurality of cross rods are respectively transversely penetrated and slidably installed on the outer walls of a plurality of I-shaped wheels, a plurality of plugs are respectively fixed on one end of a plurality of cross rods away from the injection molding device body, and the plugs are concentrically arranged with the nozzle branch pipe, and the two pull ring plates are both transversely penetrated and slidably installed on the insulation box close to the injection molding device. On one side of the main body, the U-shaped connecting plate is fixed to the top of the side of the two pull-ring plates away from the main body of the injection molding device, and the outer wall of the U-shaped connecting plate is rotatably connected to one end of a plurality of cross rods close to the main body of the injection molding device, and the two threaded rods are respectively threadedly connected to the outer wall of the insulation box on one side close to the main body of the injection molding device through the connecting frame, and the two threaded rods are respectively located above the two pull-ring plates. When the nozzle branch pipe is no longer needed, the operating threaded rod no longer restricts the position of the pull-ring plate, and the pull-ring plate is pushed toward the direction of the nozzle main pipe. The pull-ring plate drives the cross rod to move toward the direction of the nozzle main pipe through the U-shaped connecting plate, and the cross rod drives the plug to move into the nozzle branch pipe. At this time, the plug will block the nozzle branch pipe.

[0010] According to the above technical solution, the pipe blocking device also includes a plurality of gear rings and a plurality of stirring blades. The plurality of gear rings are respectively fixed on the outer wall of one end of a plurality of cross rods close to the main body of the injection molding device, and the gear rings are meshed with the tooth plates. The plurality of stirring blades are respectively and evenly fixed on the outer walls of a plurality of I-shaped wheels. The stirring blades are located inside the nozzle main pipe. At the same time, during the reciprocating lateral movement of the tooth plate along the outer wall of the nozzle main pipe, the tooth plate will drive the gear ring to rotate, the gear ring will drive the I-shaped wheel to rotate, and the I-shaped wheel will drive the stirring blade to rotate.

[0011] According to the above technical solution, an emptying device is arranged inside the nozzle main pipe, and the emptying device comprises a second motor, a screw, a U-shaped push rod, an extrusion plate, and a plurality of through-hole rings. The second motor is fixed at the bottom of the nozzle main pipe, and the screw is fixed at the output end of the second motor. The U-shaped push rod is threadedly connected to the outside of the screw, and the U-shaped push rod is transversely penetrated and slidably installed on the side of the nozzle main pipe close to the injection molding device body, and the extrusion plate is fixed on the side of the U-shaped push rod away from the injection molding device body. A plurality of through-hole rings are evenly and equidistantly rotated and installed on the outside of the extrusion plate, and the through-hole ring is sleeved on the outside of the I-shaped wheel. A through hole matching the plug is opened in the middle of the through-hole ring. Strip grooves matching the stirring blades are evenly opened on the circumference of the edge of the outer wall. After the injection molding operation of the pipeline is completed by the main body of the injection molding device, material will remain in the nozzle main pipe. Before the plug plugs the nozzle branch pipe, start the motor 2 first. The motor 2 drives the U-shaped push rod to move in the direction of the nozzle main pipe. The U-shaped push rod pushes the extrusion plate and the through-hole ring to move along the inside of the nozzle main pipe toward the nozzle branch pipe. The extrusion plate and the through-hole ring squeeze the remaining material in the nozzle main pipe out of the nozzle main pipe through the nozzle branch pipe. In the above process, since the plug plug does not block the nozzle branch pipe, the plug plug and the through-hole of the through-hole ring coincide with each other. When the plug plug blocks the nozzle branch pipe, the plug plug can push the material in the nozzle branch pipe out of the nozzle branch pipe.

[0012] A method for using a pipe injection molding device comprises the following steps:

[0013] S1, start hydraulic cylinder 1, and the telescopic end of hydraulic cylinder 1 pushes the movable mold toward the fixed mold until the movable mold overlaps with the fixed mold;

[0014] S2, start the hydraulic cylinder 2, and the telescopic end of the hydraulic cylinder 2 extends between the movable mold and the fixed mold;

[0015] S3, putting the material into the material cavity of the injection molding device body;

[0016] S4. Start the main body of the injection molding device, which will transfer the material through the nozzle main pipe to the nozzle branch pipe for ejection, and the ejected material will be injected between the movable mold and the fixed mold, thereby realizing the injection molding operation of the pipeline.

[0017] The present invention provides a pipeline injection molding device and method, which have the following beneficial effects:

[0018] (1) The present invention sets a heat preservation device so that the heat-conducting fins, the injection molding device body, and the heat preservation ring cooperate to drive the heat in the heat preservation box to insulate or preheat the nozzle main pipe and the nozzle branch pipe. The heat preservation or preheating can keep the temperature of the nozzle main pipe and the nozzle branch pipe within an appropriate range to prevent the viscosity of the material from increasing and the fluidity from being poor due to the low temperature during the injection process, thereby affecting the quality of the pipe injection molding; at the same time, the motor 1, the reciprocating screw, the threaded block, the tooth plate, the nozzle main pipe, and the U-shaped pressure frame cooperate to drive the hot air inside the folding bag to be sprayed into the heat preservation box through the one-way air outlet nozzle, thereby ensuring that the internal space of the heat preservation box can be quickly raised, which is beneficial for the heat preservation box to insulate or preheat the nozzle main pipe and the nozzle branch pipe.

[0019] (2) The present invention sets a pipe blocking device so that the threaded rod, the pull ring plate, the nozzle main pipe, the pull ring plate, the U-shaped connecting plate, and the cross rod cooperate to drive the plug to move into the nozzle branch pipe. The plug will block the nozzle branch pipe. The plug can prevent the material injected into the mold from flowing back into the nozzle branch pipe, and at the same time avoid the material from forming a blockage at the nozzle branch pipe after cooling, thereby ensuring the normal operation of the injection molding device body; at the same time, the tooth plate, the nozzle main pipe, the tooth plate, and the I-shaped wheel cooperate to drive the stirring blade to stir the material in the nozzle main pipe. By stirring the material, its temperature and state can be better maintained, the viscosity can be reduced, the fluidity can be increased, and it can be ensured that the material can smoothly fill the mold during the injection process.

[0020] (3) The present invention arranges an emptying device so that the motor 2, the U-shaped push rod, the nozzle main pipe, the extrusion plate, the through-hole ring, and the nozzle branch pipe cooperate to drive the extrusion plate and the through-hole ring to squeeze the material remaining in the nozzle main pipe out of the nozzle main pipe through the nozzle branch pipe, thereby emptying the material in the nozzle main pipe, thereby ensuring smooth and normal operation of the nozzle main pipe during the next pipe injection molding. At the same time, by emptying the material in the nozzle main pipe, material switching or equipment maintenance can be performed more quickly, reducing downtime in production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the present invention as a whole;

[0022] Figure 2 It is a partial cross-sectional schematic diagram of the present invention;

[0023] Figure 3 It is a partial cross-sectional schematic diagram of the heat preservation device of the present invention;

[0024] Figure 4 It is a partial structural schematic diagram of the heat preservation device of the present invention;

[0025] Figure 5 Schematic diagram of the pipe blocking device of the present invention Figure 1 ;

[0026] Figure 6Schematic diagram of the pipe blocking device of the present invention Figure 2 ;

[0027] Figure 7 It is a partial structural schematic diagram of the pipe blocking device of the present invention;

[0028] Figure 8 Schematic diagram of the emptying device of the present invention Figure 1 ;

[0029] Fig. 9 Schematic diagram of the emptying device of the present invention Figure 2 .

[0030] In the figure: 1, fixed table; 2, injection molding device body; 3, pipeline mold assembly; 31, U-shaped frame; 32, hydraulic cylinder 1; 33, hydraulic cylinder 2; 34, mobile mold; 35, fixed mold; 4, insulation device; 41, insulation box; 42, insulation ring; 43, heat-conducting fin; 44, connecting pipe; 45, motor 1; 46, U-shaped pressure frame; 47, tooth plate; 48, thread block; 49, reciprocating screw rod; 410, U-shaped pipe; 41 1. Folding bag; 412. One-way air outlet nozzle; 413. L-shaped one-way air inlet nozzle; 5. Pipe blocking device; 51. I-shaped wheel; 52. Cross rod; 53. Plug; 54. U-shaped connecting plate; 55. Pull ring plate; 56. Threaded rod; 57. Gear ring; 58. Stirring blade; 6. Nozzle main pipe; 61. Nozzle branch pipe; 7. Emptying device; 71. Motor 2; 72. Screw; 73. U-shaped push rod; 74. Extrusion plate; 75. Through-hole ring. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] See also Figure 1 - Figure 7 One embodiment of the present invention is: a pipe injection molding device, comprising a fixed platform 1, an injection molding device body 2 is fixed on the top of the fixed platform 1, a nozzle main pipe 6 is fixed on the output end of the injection molding device body 2, and a plurality of nozzle branch pipes 61 (such as Figure 5As shown in the figure, a pipe mold assembly 3 is arranged on the side of the nozzle branch pipe 61 away from the nozzle main pipe 6, and a heat preservation device 4 is arranged outside the injection molding device body 2. The heat preservation device 4 includes a heat preservation box 41, a heat preservation ring 42, a plurality of heat conduction fins 43, and a connecting pipe 44. The heat preservation box 41 is fixed to the outer wall of the pipe mold assembly 3, the heat preservation ring 42 is fixed to the outside of the injection molding device body 2, and a plurality of heat conduction fins 43 are evenly fixed on the inside of the heat preservation ring 42. The heat conduction fins 43 are in contact with the outer wall of the injection molding device body 2. The connecting pipe 44 is fixed between the top of the insulation box 41 and the insulation ring 42, and the insulation box 41 is connected with the inside of the insulation ring 42 through the connecting pipe 44. Through the arrangement of the above structure, the heat in the insulation box 41 can insulate or preheat the nozzle main pipe 6 and the nozzle branch pipe 61. The insulation or preheating can keep the temperature of the nozzle main pipe 6 and the nozzle branch pipe 61 within an appropriate range, preventing the viscosity of the material from increasing and the fluidity from being poor due to the low temperature during the injection process, thereby affecting the quality of the pipeline injection molding.

[0033] The heat preservation device 4 also includes a motor 45, a tooth plate 47, a threaded block 48, a reciprocating screw rod 49, a U-shaped tube 410, two folding capsules 411, an L-shaped one-way air inlet nozzle 413, two U-shaped pressure frames 46, and two one-way air outlet nozzles 412. The motor 45 is fixed to the outer wall of the heat preservation box 41, the reciprocating screw rod 49 is rotatably installed inside the heat preservation box 41, and the reciprocating screw rod 49 is fixedly connected to the output end of the motor 45, the threaded block 48 is threadedly connected to the outside of the reciprocating screw rod 49, the tooth plate 47 is fixed to the bottom of the threaded block 48, and the tooth plate 47 is laterally slidably installed on the outer wall of the nozzle main tube 6, the two U-shaped pressure frames 46 are respectively fixed to the top two sides of the tooth plate 47, one end of the two folding capsules 411 is respectively fixed to the inner wall two sides of the heat preservation box 41, and the other ends of the two folding capsules 411 are respectively fixed to the two U-shaped pressure frames 46 are away from each other, two one-way air outlet nozzles 412 are respectively fixed on the side of the two U-shaped pressing frames 46 that are close to each other, the U-shaped tube 410 is fixed between the tops of the two folding bags 411, and the L-shaped one-way air inlet nozzle 413 is fixed on the top of the U-shaped tube 410, and the L-shaped one-way air inlet nozzle 413 extends to the inside of the connecting tube 44, the L-shaped one-way air inlet nozzle 413 is used to control the one-way air intake of the folding bag 411, and the one-way air outlet nozzle 412 is used to control the one-way air outlet of the folding bag 411. Through the arrangement of the above structure, the U-shaped pressing frame 46 will squeeze the folding bag 411, and the hot air inside the folding bag 411 will be sprayed into the insulation box 41 through the one-way air outlet nozzle 412, thereby ensuring that the internal space of the insulation box 41 can be quickly raised, which is beneficial for the insulation box 41 to keep warm or preheat the nozzle main pipe 6 and the nozzle branch pipe 61.

[0034] The pipeline mold assembly 3 includes a U-shaped frame 31, a hydraulic cylinder 1 32, a hydraulic cylinder 2 33, a movable mold 34, and a fixed mold 35. The U-shaped frame 31 is fixed on the top of the fixed platform 1, the hydraulic cylinder 1 32 is fixed on the outer wall of the U-shaped frame 31 on one side away from the injection molding device body 2, the movable mold 34 is fixed on the telescopic end of the hydraulic cylinder 1 32, the hydraulic cylinder 2 33 is fixed on the front side of the U-shaped frame 31, and the fixed mold 35 is fixed on the inner wall of the U-shaped frame 31 on one side close to the injection molding device body 2.

[0035] A pipe blocking device 5 is arranged inside the nozzle main pipe 6, and the pipe blocking device 5 includes a plurality of I-shaped wheels 51, a plurality of cross rods 52, a plurality of plugs 53, a U-shaped connecting plate 54, two pull ring plates 55, and two threaded rods 56. The plurality of I-shaped wheels 51 are evenly and equidistantly rotated and installed on the side of the nozzle main pipe 6 close to the injection molding device body 2, and the I-shaped wheels 51 penetrate the outer wall of the nozzle main pipe 6, and the plurality of cross rods 52 are respectively transversely penetrated and slidably installed on the outer walls of the plurality of I-shaped wheels 51, and the plurality of plugs 53 are respectively fixed on the ends of the plurality of cross rods 52 away from the injection molding device body 2, and the plugs 53 are concentrically arranged with the nozzle branch pipe 61, and the two pull ring plates 55 are both transversely penetrated and slidably installed on the side of the insulation box 41 close to the injection molding device body 2, and the U The U-shaped connecting plate 54 is fixed to the top of the side of the two pull ring plates 55 away from the injection molding device body 2, and the outer wall of the U-shaped connecting plate 54 is rotatably connected to one end of a plurality of cross rods 52 close to the injection molding device body 2, and the two threaded rods 56 are respectively threadedly connected to the outer wall of the insulation box 41 close to the injection molding device body 2 through the connecting frame, and the two threaded rods 56 are respectively located above the two pull ring plates 55. Through the arrangement of the above structure, the cross rod 52 drives the plug 53 to move into the nozzle branch pipe 61, and the plug 53 will block the nozzle branch pipe 61. The plug 53 can prevent the material injected into the mold from flowing back into the nozzle branch pipe 61, and at the same time avoid the material from forming a blockage at the nozzle branch pipe 61 after cooling, thereby ensuring the normal operation of the injection molding device body 2.

[0036] The pipe blocking device 5 also includes a plurality of gear rings 57 and a plurality of stirring blades 58. The plurality of gear rings 57 are respectively fixed on the outer wall of one end of the plurality of cross rods 52 close to the injection molding device body 2, and the gear rings 57 are meshed with the tooth plate 47. The plurality of stirring blades 58 are respectively and evenly fixed on the outer walls of the plurality of I-shaped wheels 51. The stirring blades 58 are located inside the nozzle main pipe 6. Through the arrangement of the above structure, the stirring blades 58 stir the material in the nozzle main pipe 6. By stirring the material, its temperature and state can be better maintained, the viscosity can be reduced, the fluidity can be increased, and it is ensured that the material can smoothly fill the mold during the injection process.

[0037] When in use, the hydraulic cylinder 1 32 is started, and the telescopic end of the hydraulic cylinder 1 32 pushes the movable mold 34 toward the fixed mold 35 until the movable mold 34 overlaps with the fixed mold 35, and then the hydraulic cylinder 2 33 is started, and the telescopic end of the hydraulic cylinder 2 33 extends between the movable mold 34 and the fixed mold 35. Then, the material is put into the material cavity of the injection molding device body 2, and the injection molding device body 2 is started. The injection molding device body 2 will transmit the material through the nozzle main pipe 6 to the nozzle branch pipe 61 for ejection, and the ejected material will be injected into The heat dissipated by the injection molding device body 2 is directed to the heat preservation ring 42 by the heat conduction fins 43, and the heat in the heat preservation ring 42 is transferred to the heat preservation box 41 through the connecting pipe 44. The heat in the heat preservation box 41 can keep the nozzle main pipe 6 and the nozzle branch pipe 61 warm or preheat them. The heat preservation or preheating can keep the temperature of the nozzle main pipe 6 and the nozzle branch pipe 61 within a suitable range to prevent the object from being damaged. During the injection process, the viscosity of the material increases due to the low temperature, and the fluidity is poor, which affects the quality of the pipe injection molding; at the same time, the motor 45 is started, and the output end of the motor 45 drives the reciprocating screw 49 to rotate, and the reciprocating screw 49 drives the tooth plate 47 to move back and forth along the outer wall of the nozzle main pipe 6 through the threaded block 48, and the tooth plate 47 drives the U-shaped pressing frame 46 to move with it. Every time the tooth plate 47 drives the U-shaped pressing frame 46 away from the inner wall of the insulation box 41, the U-shaped pressing frame 46 will stretch the folding bag 411, and the folding bag 411 will be folded. The bag 411 sucks the hot air in the insulation ring 42 into the folding bag 411 through the U-shaped tube 410 and the L-shaped one-way air inlet nozzle 413. Every time the tooth plate 47 drives the U-shaped pressure frame 46 to lean against the inner wall of the insulation box 41, the U-shaped pressure frame 46 will squeeze the folding bag 411, and the hot air inside the folding bag 411 will be sprayed into the insulation box 41 through the one-way air outlet nozzle 412, thereby ensuring that the internal space of the insulation box 41 can be quickly raised, which is beneficial for the insulation box 41 to insulate or preheat the nozzle main pipe 6 and the nozzle branch pipe 61.

[0038] The threaded rod 56 is rotated every time the nozzle branch pipe 61 needs to be used. The threaded rod 56 is acted upon by the threads between the connecting frames corresponding to the heat preservation box 41, and the threaded rod 56 moves upward. The threaded rod 56 does not contact the top surface of the pull ring plate 55, and the threaded rod 56 no longer restricts the position of the pull ring plate 55. The pull ring plate 55 is pulled in the direction away from the nozzle main pipe 6. The pull ring plate 55 drives the cross rod 52 to move in the direction away from the nozzle main pipe 6 through the U-shaped connecting plate 54, and the cross rod 52 drives the plug 53 to move out of the nozzle branch pipe 61. At this time, the plug 53 no longer blocks the nozzle branch pipe 61, and the threaded rod 56 is rotated in the opposite direction. The threaded rod 56 is acted upon by the threads between the connecting frames corresponding to the heat preservation box 41, and the threaded rod 56 moves downward. The threaded rod 56 contacts the top surface of the pull ring plate 55, and the threaded rod 56 restricts the position of the pull ring plate 55. When the nozzle branch pipe 61 is no longer needed to be used, the operating threaded rod 56 no longer restricts the position of the pull ring plate 55. The pull ring plate 55 is pushed in the direction of the nozzle main pipe 6, and the pull ring plate 55 drives the cross rod 52 to move in the direction of the nozzle main pipe 6 through the U-shaped connecting plate 54, and the cross rod 52 drives the plug 53 to move into the nozzle branch pipe 61. At this time, the plug 53 will block the nozzle branch pipe 61, and the plug 53 can prevent the material injected into the mold from flowing back into the nozzle branch pipe 61, and at the same time avoid the material from forming a blockage at the nozzle branch pipe 61 after cooling, thereby ensuring the normal operation of the injection molding device body 2; at the same time, during the reciprocating lateral movement of the tooth plate 47 along the outer wall of the nozzle main pipe 6, the tooth plate 47 will drive the gear ring 57 to rotate, the gear ring 57 drives the I-shaped wheel 51 to rotate, and the I-shaped wheel 51 drives the stirring blade 58 to rotate, so that the stirring blade 58 stirs the material in the nozzle main pipe 6, and by stirring the material, its temperature and state can be better maintained, the viscosity can be reduced, the fluidity can be increased, and it is ensured that the material can smoothly fill the mold during the injection process.

[0039] See also Figure 8 - Fig. 9 Based on the above embodiment, in another embodiment of the present invention, an emptying device 7 is provided inside the nozzle main pipe 6.

[0040] The emptying device 7 includes a second motor 71, a screw 72, a U-shaped push rod 73, an extrusion plate 74, and a plurality of through-hole rings 75. The second motor 71 is fixed to the bottom of the nozzle main pipe 6, the screw 72 is fixed to the output end of the second motor 71, the U-shaped push rod 73 is threadedly connected to the outside of the screw 72, and the U-shaped push rod 73 is transversely penetrated and slidably installed on the side of the nozzle main pipe 6 close to the injection molding device body 2, the extrusion plate 74 is fixed to the side of the U-shaped push rod 73 away from the injection molding device body 2, and a plurality of through-hole rings 75 are evenly and equidistantly rotated and installed on the outside of the extrusion plate 74, and the through-hole ring 75 is sleeved on the outside of the I-shaped wheel 51. A through hole matching the plug 53 is provided in the middle of the through hole ring 75, and strip grooves matching the stirring blades 58 are evenly provided at the circumference of the outer wall edge of the through hole ring 75. Through the arrangement of the above structure, the extrusion plate 74 and the through hole ring 75 squeeze the residual material inside the nozzle main pipe 6 through the nozzle branch pipe 61 to discharge the nozzle main pipe 6, so that the material in the nozzle main pipe 6 is emptied, thereby ensuring the smooth and normal operation of the nozzle main pipe 6 during the next pipeline injection molding. At the same time, by emptying the material in the nozzle main pipe 6, material switching or equipment maintenance can be performed faster, reducing downtime in production.

[0041] When in use, after the injection molding device body 2 completes the injection molding operation on the pipeline, there will be residual material in the nozzle main pipe 6. Before the plug 53 blocks the nozzle branch pipe 61, the motor 2 71 is started first, and the motor 2 71 drives the U-shaped push rod 73 to move in the direction of the nozzle main pipe 6. The U-shaped push rod 73 pushes the extrusion plate 74 and the through-hole ring 75 to move along the inside of the nozzle main pipe 6 toward the nozzle branch pipe 61. The extrusion plate 74 and the through-hole ring 75 squeeze the residual material in the nozzle main pipe 6 out of the nozzle main pipe through the nozzle branch pipe 61. 6, so that the material in the nozzle main pipe 6 is emptied, thereby ensuring the smooth and normal operation of the nozzle main pipe 6 during the next pipe injection molding. At the same time, by emptying the material in the nozzle main pipe 6, material switching or equipment maintenance can be performed more quickly, reducing downtime in production. In the above process, since the plug 53 does not block the nozzle branch pipe 61, the plug 53 at this time coincides with the through hole of the through hole ring 75. When the plug 53 blocks the nozzle branch pipe 61, the plug 53 can push the material in the nozzle branch pipe 61 to be discharged from the nozzle branch pipe 61.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pipe injection molding device, comprising a fixed platform (1), an injection molding device body (2) is fixed on the top of the fixed platform (1), a nozzle main pipe (6) is fixed on the output end of the injection molding device body (2), a plurality of nozzle branch pipes (61) are fixed on the side of the nozzle main pipe (6) away from the injection molding device body (2), and a pipe mold assembly (3) is arranged on the side of the nozzle branch pipe (61) away from the nozzle main pipe (6), characterized in that: A heat preservation device (4) is arranged outside the injection molding device body (2); The heat-insulating device (4) comprises a heat-insulating box (41), a heat-insulating ring (42), a plurality of heat-conducting fins (43), and a connecting pipe (44); the heat-insulating box (41) is fixed to the outer wall of the pipeline mold assembly (3); the heat-insulating ring (42) is fixed to the outside of the injection molding device body (2); a plurality of heat-conducting fins (43) are evenly fixed on the inside of the heat-insulating ring (42) in a circumferential manner, and the heat-conducting fins (43) are in contact with the outer wall of the injection molding device body (2); the connecting pipe (44) is fixed between the heat-insulating box (41) and the top of the heat-insulating ring (42); and the heat-insulating box (41) is connected to the inside of the heat-insulating ring (42) through the connecting pipe (44).

2. A pipe injection molding device according to claim 1, characterized in that: The heat preservation device (4) also includes a motor (45), a tooth plate (47), a threaded block (48), a reciprocating screw (49), a U-shaped tube (410), two folding bags (411), an L-shaped one-way air inlet nozzle (413), two U-shaped pressure frames (46), and two one-way air outlet nozzles (412). The motor (45) is fixed to the outer wall of the heat preservation box (41), the reciprocating screw (49) is rotatably installed inside the heat preservation box (41), and the reciprocating screw (49) is fixedly connected to the output end of the motor (45), the threaded block (48) is threadedly connected to the outside of the reciprocating screw (49), the tooth plate (47) is fixed to the bottom of the threaded block (48), and the tooth plate (47) slides laterally. Installed on the outer wall of the nozzle main pipe (6), the two U-shaped pressure frames (46) are respectively fixed on both sides of the top of the tooth plate (47), one end of the two folding bags (411) are respectively fixed on both sides of the inner wall of the insulation box (41), the other ends of the two folding bags (411) are respectively fixed on the side of the two U-shaped pressure frames (46) away from each other, the two one-way air outlet nozzles (412) are respectively fixed on the side of the two U-shaped pressure frames (46) close to each other, the U-shaped tube (410) is fixed between the tops of the two folding bags (411), the L-shaped one-way air inlet nozzle (413) is fixed on the top of the U-shaped tube (410), and the L-shaped one-way air inlet nozzle (413) extends to the inside of the connecting tube (44).

3. A pipe injection molding device according to claim 2, characterized in that: The L-shaped one-way air inlet nozzle (413) is used to control the one-way air inlet of the folding bag (411), and the one-way air outlet nozzle (412) is used to control the one-way air outlet of the folding bag (411).

4. A pipe injection molding device according to claim 3, characterized in that: The pipeline mold assembly (3) comprises a U-shaped frame (31), a hydraulic cylinder 1 (32), a hydraulic cylinder 2 (33), a movable mold (34), and a fixed mold (35); the U-shaped frame (31) is fixed on the top of the fixed platform (1); the hydraulic cylinder 1 (32) is fixed on the outer wall of the U-shaped frame (31) away from the injection molding device body (2); the movable mold (34) is fixed on the telescopic end of the hydraulic cylinder 1 (32); the hydraulic cylinder 2 (33) is fixed on the front side of the U-shaped frame (31); and the fixed mold (35) is fixed on the inner wall of the U-shaped frame (31) close to the injection molding device body (2).

5. A pipe injection molding device according to claim 4, characterized in that: A pipe blocking device (5) is arranged inside the nozzle main pipe (6), and the pipe blocking device (5) comprises a plurality of I-shaped wheels (51), a plurality of cross rods (52), a plurality of plugs (53), a U-shaped connecting plate (54), two pull ring plates (55), and two threaded rods (56). The plurality of I-shaped wheels (51) are evenly and equidistantly rotatably mounted on a side of the nozzle main pipe (6) close to the injection molding device body (2), and the I-shaped wheels (51) penetrate the outer wall of the nozzle main pipe (6), the plurality of cross rods (52) respectively penetrate transversely and are slidably mounted on the outer walls of the plurality of I-shaped wheels (51), and the plurality of plugs (53) are respectively fixed on the plurality of cross rods (52) away from the injection molding device body. The plug (53) and the nozzle branch pipe (61) are arranged concentrically, the two pull-ring plates (55) are both transversely penetrated and slidably installed on the side of the heat preservation box (41) close to the injection molding device body (2), the U-shaped connecting plate (54) is fixed to the top of the two pull-ring plates (55) on the side away from the injection molding device body (2), and the outer wall of the U-shaped connecting plate (54) is rotatably connected to one end of a plurality of cross rods (52) close to the injection molding device body (2), the two threaded rods (56) are respectively threadedly connected to the outer wall of the heat preservation box (41) on the side close to the injection molding device body (2) through the connecting frame, and the two threaded rods (56) are respectively located above the two pull-ring plates (55).

6. A pipe injection molding device according to claim 5, characterized in that: The pipe blocking device (5) further comprises a plurality of gear rings (57) and a plurality of stirring blades (58). The plurality of gear rings (57) are respectively fixed to the outer wall of one end of the plurality of cross rods (52) close to the injection molding device body (2), and the gear rings (57) are meshed with the tooth plate (47). The plurality of stirring blades (58) are respectively evenly fixed to the outer wall of the plurality of I-shaped wheels (51) in a circumferential manner. The stirring blades (58) are located inside the nozzle main pipe (6).

7. A pipe injection molding device according to claim 6, characterized in that: An emptying device (7) is arranged inside the nozzle main pipe (6), and the emptying device (7) comprises a second motor (71), a screw (72), a U-shaped push rod (73), an extrusion plate (74), and a plurality of through-hole rings (75). The second motor (71) is fixed at the bottom of the nozzle main pipe (6), the screw (72) is fixed at the output end of the second motor (71), the U-shaped push rod (73) is threadedly connected to the outside of the screw (72), and the U-shaped push rod (73) is transversely penetrated and slidably installed on a side of the nozzle main pipe (6) close to the injection molding device body (2), the extrusion plate (74) is fixed on a side of the U-shaped push rod (73) away from the injection molding device body (2), and a plurality of through-hole rings (75) are evenly and equidistantly rotatably installed on the outside of the extrusion plate (74).

8. A pipe injection molding device according to claim 7, characterized in that: The through hole ring (75) is sleeved on the outside of the I-shaped wheel (51), a through hole matching the plug (53) is opened in the middle of the through hole ring (75), and strip grooves matching the stirring blades (58) are evenly opened on the circumference of the outer wall edge of the through hole ring (75).

9. A method for using a pipe injection molding device, comprising the pipe injection molding device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, start the hydraulic cylinder 1 (32), and the telescopic end of the hydraulic cylinder 1 (32) pushes the movable mold (34) toward the fixed mold (35) until the movable mold (34) overlaps with the fixed mold (35); S2, start the second hydraulic cylinder (33), and the telescopic end of the second hydraulic cylinder (33) extends between the movable mold (34) and the fixed mold (35); S3, putting the material into the material cavity of the injection molding device body (2); S4. Start the injection molding device body (2). The injection molding device body (2) will transfer the material through the nozzle main pipe (6) to the nozzle branch pipe (61) for ejection. The ejected material will be injected between the movable mold (34) and the fixed mold (35), thereby realizing the injection molding operation of the pipeline.

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