A plastic particle preheating device and an injection molding machine

Abstract

The present invention discloses a plastic particle preheating device and an injection molding machine, which relates to the technical field of heating devices for injection molding machines and aims to solve the technical problem that plastic particles cannot be compacted in traditional heating devices for injection molding machines. It includes a blanking rack, a conveying mechanism, a transmission module, a heating component, and a compression component. In the present invention, through the peristalsis of four movable cylinders by the conveying mechanism and in coordination with the double screw, the material is accurately conveyed and flipped to be compacted; the transmission module uses a cam, a ratchet pawl, and ratchet teeth to make the movable cylinders operate intermittently, controlling the timing for filling the screw with particles; the heating component can flexibly arrange heating elements according to air pressure, achieving efficient sectional or centralized heating and improving the extrusion and melting efficiency of particles; the extrusion ring of the compression component moves left and right to prevent particle backflow, increasing the saturation degree of loading and strengthening the softening and compaction of particles; a sealing structure replaces the spring, avoiding temperature interference and entanglement, ensuring the stability of the device, and greatly improving production efficiency and product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of heating devices for injection molding machines, and more specifically, to a plastic particle preheating device and an injection molding machine. Background Art

[0002] A plastic particle preheating device is a device used to preheat plastic particles during the injection molding process. Its main function is to heat plastic particles to a certain temperature before they enter the barrel of the injection molding machine, so as to better carry out the subsequent melting and plasticizing processes. During the injection molding process of plastic particles, the material can be preheated and pressurized to improve the melt flow rate of the plastic, increase the plasticizing capacity, improve the injection molding efficiency, and also reduce the probability of problems such as insufficient filling, sink marks, and bubbles in the molding of molten plastic;

[0003] The traditional conveying mechanism has a simple design and is difficult to accurately control the conveying amount of plastic particles. There are often situations of too much or too little material on the second screw, and there are no effective means of flipping and compacting the material during the conveying process, resulting in uneven material distribution, which is not conducive to subsequent processing. In addition, the phenomenon of material backflow occurs frequently, seriously interfering with the production process, reducing the loading efficiency and saturation, and thus affecting the continuity and stability of injection molding production;

[0004] Traditional heating devices usually adopt a fixed layout and constant power, and cannot flexibly adjust the heating range and temperature distribution according to the different stage requirements during the process of plastic particles changing from solid state to liquid state. This makes the heating efficiency low and difficult to meet the processing requirements of diverse plastic materials, not only reducing the extrusion efficiency of plastic particles, but also increasing the energy consumption and defective rate during the particle melting process. The traditional device is difficult to accurately control the conveying rhythm and cannot provide a reasonable time interval for filling plastic particles into the screw, resulting in chaotic and disorderly material filling, greatly affecting the production stability and the consistency of product quality. In view of this, we propose a plastic particle preheating device and an injection molding machine. Summary of the Invention

[0005] The purpose of the present invention is to provide a plastic particle preheating device and an injection molding machine to solve the technical problem that plastic particles in the traditional heating device of the injection molding machine cannot be tightly conveyed.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A plastic particle preheating device includes a blanking frame, a conveying mechanism arranged on the left side of the blanking frame, a transmission module, a heating component, and a compression component. The output end of the blanking frame is fixedly connected and communicated with a first conveying pipe, and a second conveying pipe is fixedly sleeved inside the first conveying pipe, and a second sealing layer is arranged on the inner wall of the second conveying pipe;

[0007] The conveying mechanism includes a first screw rod and four movable cylinders arranged inside the blanking frame, and a second screw rod arranged inside the second conveying pipe; the four movable cylinders move left or right in sequence, causing the four movable cylinders to move in a peristaltic form, pushing out, turning over, and squeezing and compacting the excess material inside two adjacent blades on the second screw rod;

[0008] The transmission module includes a cam rotatably sleeved on the surface of the second conveying pipe, which is used to drive the four movable cylinders to move in a wavy undulation;

[0009] The heating component includes a number of heating elements arranged in a linear array inside the second sealing interlayer on the second conveying pipe. The second sealing interlayer conveys gas or evacuates gas, causing the number of heating elements to gather or unfold. When gathering, the plastic particles melt from hard particles into a solution, and when unfolding, the plastic particles are in a segmented form;

[0010] The compression component includes an extrusion ring arranged inside the edge of the blanking frame. When the extrusion ring moves to the left, it prevents the peristaltically discharged particles from squeezing and flowing back, improving the loading and loading saturation efficiency after extrusion; when moving to the right, the softened particles on the left continuously accumulate, squeeze and compact, and the particles on the left turn over to make the particles soften comprehensively. The conveying mechanism of the present invention can accurately push out the excess material on the second screw rod and realize the turning over of the material through the unique peristaltic design of the four movable cylinders, cooperate with the first and second screw rods to work together, and effectively improve the material conveying and compaction effects; the transmission module uses the ingenious cooperation of the cam, ratchet pawl and ratchet teeth to realize the intermittent peristalsis of the movable cylinder, providing sufficient time for filling the second screw rod with particles; the heating component can change the air pressure by conveying gas, flexibly adjust the arrangement of the heating elements, and realize segmented or centralized heating, significantly improving the extrusion and melting efficiency of plastic particles; the extrusion ring of the compression component can move left and right under the accumulation of materials and the push of the movable cylinder. Moving to the left prevents particle backflow and improves the loading saturation efficiency, and moving to the right enhances the softening and compaction effects of the particles; the sealing structure of the present invention replaces the spring to avoid temperature interference and winding problems, greatly improving the operation reliability, production efficiency and product quality of the device.

[0011] Preferably, a first interlayer is formed between the first conveying pipe and the second conveying pipe. The output end of the second conveying pipe is fixedly communicated with a gun head. The top of the blanking frame is fixedly communicated with a funnel, and the left side of the blanking frame is fixedly connected with a square frame.

[0012] Preferably, the conveying mechanism further includes a first motor. The first motor is fixedly connected to the right side of the blanking frame, and the output shaft of the first motor passes through the blanking frame and is fixedly connected to the first screw rod. An outer inclined surface is provided at the edge of one end of one of the movable cylinders, and inner inclined surfaces are provided at the edges of the other three movable cylinders. One ends of the four movable cylinders form a first sealing cavity with the first interlayer, and push rods are fixedly connected to one ends of the four movable cylinders and pass through one side of the first conveying pipe.

[0013] Preferably, the first screw rod is movably sleeved inside the blanking frame, the second screw rod is movably sleeved inside the second conveying pipe, the blade diameter of the second screw rod is smaller than that of the first screw rod and they are horizontally coaxial, and the four movable cylinders are movably sleeved inside the first sandwich layer of the first conveying pipe and the second conveying pipe;

[0014] The compression assembly is located between the first screw rod and the second screw rod;

[0015] The four movable cylinders move left or right in sequence, causing the four movable cylinders to present a peristaltic motion form, pushing out the redundant materials inside the adjacent two blades on the second screw rod, flipping the plastic particles, stacking and extruding them, so that the particles are compacted.

[0016] Preferably, the transmission module further includes an annular groove, the annular groove is opened on the surface of the cam, a pawl is fixedly connected inside the annular groove, a handle is rotatably sleeved inside the annular groove, and the end of the handle passes through the square frame. A number of ratchet teeth are fixedly connected to the inner wall of the handle in an annular array, and the ratchet teeth are meshed with the pawl. The end of the square frame is fixedly connected with a hydraulic rod, and the output shaft of the hydraulic rod is hinged to the end of the handle;

[0017] The end of the push rod is in sliding contact with the right contour surface of the cam;

[0018] By the operation of the hydraulic rod, the handle makes a reciprocating arc motion, and through the meshing connection or non-meshing sliding connection between the pawl and the ratchet teeth, the cam rotates intermittently, and further the four movable cylinders move intermittently in a peristaltic manner.

[0019] Preferably, the heating assembly further includes an air delivery pipe, the air delivery pipe is fixedly connected to the surface of the left end of the second conveying pipe, and the air delivery pipe is communicated with the second sealed sandwich layer on the second conveying pipe. The heating element at the right end is hermetically slidable in the second sealed sandwich layer.

[0020] Preferably, a number of waist-shaped plates are fixedly connected to the right side of each heating element in an annular array, a number of sliding plates are fixedly connected to the left side of each heating element in an annular array, and the convex blocks on the sliding plates are slidably connected inside the waist-shaped plates;

[0021] By inputting or discharging gas into the second sealed sandwich layer through the air delivery pipe, the heating element moves, and further realizes that the heating elements are arranged in a linear array or linearly gathered. When the heating elements are arranged in a linear array, the plastic particles change from hard particles to softened particles and then melt into a solution in sequence; when the heating elements are arranged in a linearly gathered manner, the plastic particles melt from hard particles into a solution.

[0022] Preferably, the compression assembly further includes a connecting rod, the connecting rod is fixedly connected between the first screw rod and the second screw rod and is horizontally coaxial, and the extrusion ring is slidably sleeved on the surface of the connecting rod.

[0023] Preferably, a flow channel is formed between the extrusion ring and the connecting rod, and the extrusion ring is in movable contact with one of the movable cylinders. The inner cavity of the extrusion ring is an annular extrusion cavity. The inner wall of the extrusion ring is provided with leakage openings in an annular array. The inner wall of the left side of the connecting rod is provided with a plurality of flow channels in an annular array, and the flow channels correspond to the positions of the leakage openings. A plurality of stoppers are fixedly connected to the right side of the connecting rod in an annular array, and the stoppers are hermetically adapted to the leakage openings;

[0024] The extrusion ring moves left or right by the extrusion of plastic particles and the push of the movable cylinder.

[0025] Preferably, an injection molding machine of a plastic particle preheating device includes a machine tool and a housing arranged on the left side of the top of the machine tool. A bracket is fixedly connected to the right side of the top of the machine tool. A hydraulic module is fixedly connected to the left side of the top of the machine tool, and the hydraulic module is located inside the housing. The output end of the hydraulic module is provided with a mold clamping system, and an injection system is arranged on one side of the mold clamping system.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. The conveying mechanism of the present invention can accurately push out the redundant materials on the second screw and realize the material turnover through the unique peristaltic design of four movable cylinders. Cooperating with the first and second screws to work together, it effectively improves the material conveying and compaction effects; the transmission module uses the ingenious cooperation of the cam, ratchet pawl and ratchet teeth to realize the intermittent peristalsis of the movable cylinder, providing sufficient time for filling the second screw with particles; the heating component can change the air pressure by gas transmission, flexibly adjust the arrangement of the heating elements, and realize segmented or centralized heating, significantly improving the extrusion and melting efficiency of plastic particles; the extrusion ring of the compression component can move left and right under the action of material accumulation and the push of the movable cylinder, preventing the backflow of particles to the left and improving the loading saturation efficiency, and enhancing the softening and compaction effects of particles to the right; the sealing structure of the present invention replaces the spring to avoid temperature interference and winding problems, greatly improving the operation reliability, production efficiency and product quality of the device.

[0028] 2. The present invention uses the ingenious cooperation of the cam, ratchet pawl and ratchet teeth through the transmission module, drives the handle to make a reciprocating arc motion through the hydraulic rod, makes the cam rotate intermittently, and then controls the intermittent peristalsis of the movable cylinder; accurately provides sufficient time for filling the second screw with plastic particles, avoids the chaos of material filling, greatly improves the filling accuracy and stability, and optimizes the material conveying rhythm.

[0029] 3. In the present invention, the heating component changes the air pressure in the second sealed interlayer through an air delivery pipeline, and flexibly controls the heating elements to be arranged in a linear array or in a concentrated manner; the linear array arrangement realizes segmented heating, and the plastic particles sequentially experience the hardening, softening, and melting stages, improving the extrusion efficiency in the softening area; the concentrated arrangement increases the local temperature and accelerates the melting of the plastic particles, meeting the diverse temperature requirements in different processing stages. Compared with the fixed heating method, the heating efficiency and flexibility are significantly improved.

[0030] 4. In the present invention, the extrusion ring of the compression component moves left and right under the action of the material accumulation and the movement of the movable cylinder. When moving to the left, it prevents the backflow of the peristaltically discharged particles, improving the loading efficiency and saturation degree after extrusion; when moving to the right, it realizes the compaction of the material in the annular extrusion cavity, comprehensively improving the softening effect and compaction degree of the particles and enhancing the processing quality of the raw materials. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0032] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention to show the cross-sectional structure of the injection molding machine.

[0033] Figure 3 It is a schematic diagram of the overall structure of the heating device of the present invention.

[0034] Figure 4 It is a schematic cross-sectional view of the overall structure of the heating device of the present invention.

[0035] Figure 5 It is a schematic cross-sectional view of the heating device of the present invention.

[0036] Figure 6 It is a schematic three-dimensional structure diagram of the conveying mechanism of the present invention to show the three-dimensional structure of the movable cylinder.

[0037] Figure 7 It is a schematic three-dimensional structure diagram of the heating component of the present invention.

[0038] Figure 8 It is a schematic three-dimensional structure diagram of the compression component of the present invention.

[0039] Figure 9 It is a schematic three-dimensional structure diagram of the compression component of the present invention to show the three-dimensional structure of the stop block.

[0040] Figure 10 It is a schematic enlarged overall structure diagram of the compression component of the present invention.

[0041] Figure 11 It is a schematic enlarged three-dimensional structure diagram of the extrusion ring.

[0042] Figure 12Schematic diagram of the linear array distribution structure of the heating element of the present invention, showing the segmented heating use state.

[0043] Figure 13 Schematic diagram of the concentrated distribution structure of the heating element of the present invention, showing the rapid heating use state.

[0044] Description of reference numerals in the figure: 1. blanking rack; 11. first conveying pipe; 12. second conveying pipe; 13. gun head; 14. funnel; 15. square frame; 2. conveying mechanism; 21. first screw; 22. second screw; 23. first motor; 24. movable cylinder; 241. outer inclined surface; 242. inner inclined surface; 25. push rod; 3. transmission module; 31. cam; 32. annular groove; 33. ratchet pawl; 34. handle; 35. ratchet teeth; 36. hydraulic rod; 4. heating assembly; 41. gas transmission pipeline; 42. heating element; 43. waist-shaped plate; 44. sliding plate; 5. compression assembly; 51. connecting rod; 52. extrusion ring; 521. annular extrusion cavity; 522. leakage port; 53. flow channel; 54. stop block; 6. machine tool; 61. housing; 62. bracket; 63. hydraulic module; 64. mold clamping system; 65. injection system; 7. melting and heating area; 71. softening and heating area; 72. hardening area. Detailed implementation manners

[0045] Example 1:

[0046] As Figures 1-6 and Figures 8-9 shown, a plastic particle preheating device based on an injection molding machine according to the present invention includes a blanking rack 1, a conveying mechanism 2 arranged on the left side of the blanking rack 1, a transmission module 3, a heating assembly 4, and a compression assembly 5;

[0047] The output end edge of the blanking rack 1 is fixedly communicated with a first conveying pipe 11, a second conveying pipe 12 is fixedly sleeved inside the first conveying pipe 11, and a first interlayer is formed between the first conveying pipe 11 and the second conveying pipe 12. Also, a second sealing interlayer is arranged on the inner wall of the second conveying pipe 12. The output end of the second conveying pipe 12 is fixedly communicated with a gun head 13. The top of the blanking rack 1 is fixedly communicated with a funnel 14, and the left side of the blanking rack 1 is fixedly connected with a square frame 15;

[0048] The conveying mechanism 2 includes a first screw 21 which is movably sleeved inside the blanking rack 1. A second screw 22 is movably sleeved inside the second conveying pipe 12. The blade diameter of the second screw 22 is smaller than that of the first screw 21 and they are horizontally coaxial. Moreover, the compression assembly 5 is located between the first screw 21 and the second screw 22. The right side of the blanking rack 1 is fixedly connected with a first motor 23, and the output shaft of the first motor 23 passes through the blanking rack 1 and is fixedly connected with the first screw 21. Four movable cylinders 24 are movably sleeved in the first interlayer between the first conveying pipe 11 and the second conveying pipe 12. An outer inclined surface 241 is provided at the end edge of one of the movable cylinders 24, and inner inclined surfaces 242 are provided at the end edges of the other three movable cylinders 24. One ends of the four movable cylinders 24 form a first sealing cavity with the first interlayer. One ends of the four movable cylinders 24 are all fixedly connected with push rods 25 which pass through one side of the first conveying pipe 11.

[0049] Specifically, the four movable cylinders 24 move left or right in sequence, causing the four movable cylinders 24 to exhibit a peristaltic motion pattern, pushing out the excess material inside the adjacent two blades on the second screw 22, and flipping the material through the four movable cylinders 24, and achieving the compaction effect of plastic particles by material accumulation.

[0050] During use, the four movable cylinders 24 move in sequence, exhibiting a peristaltic motion pattern, pushing out the excess material inside the adjacent two blades on the second screw 22. The plastic particles first move upward and rightward through the outer inclined surface 241, and then move downward and rightward through the inner inclined surface 242. While achieving the accumulation and extrusion of the material, the material is flipped. During the peristalsis of the four movable cylinders 24, a force is applied to the ends of the four movable cylinders 24 through the first sealing cavity, causing the push rods 25 on the movable cylinders 24 to always contact the transmission components.

[0051] It is worth noting that by applying tensile or thrust forces to the four movable cylinders 24 respectively through the first sealing cavity, instead of applying elastic or tensile forces to the movable cylinders 24 by springs, a sealing structure is adopted, which can not only avoid temperature interference, but also prevent the interlacing and entanglement of several springs, affecting the elastic characteristics and the effect on the movable cylinders 24.

[0052] The conveying mechanism 2 of the present invention can accurately push out the redundant materials on the second screw 22 and realize material turning through the unique peristaltic design of four movable cylinders 24. Cooperating with the first and second screws to work together, it effectively improves the material conveying and compaction effects. The transmission module 3 uses the ingenious cooperation of the cam 31, the ratchet pawl 33 and the ratchet teeth 35 to realize the intermittent peristalsis of the movable cylinder 24, providing sufficient time for filling the second screw 22 with particles. The heating component 4 can change the air pressure by conveying gas, flexibly adjust the arrangement of the heating elements 42, and realize segmented or centralized heating, significantly improving the extrusion and melting efficiency of plastic particles. The extrusion ring 52 of the compression component 5 can move left and right under the action of material accumulation and the push of the movable cylinder 24, preventing particle backflow to the left and improving the loading saturation efficiency, and enhancing the particle softening and compaction effects to the right. The sealing structure of the present invention replaces the spring to avoid temperature interference and winding problems, greatly improving the operation reliability, production efficiency and product quality of the device.

[0053] Embodiment 2:

[0054] As Figures 5-6 shown, in the embodiment of the present invention, the transmission module 3 includes a cam 31, the cam 31 is rotatably sleeved on the surface of the second conveying pipe 12, and the end of the push rod 25 is in sliding contact with the right contour surface of the cam 31. An annular groove 32 is formed on the surface of the cam 31, a ratchet pawl 33 is fixedly connected inside the annular groove 32, a handle 34 is rotatably sleeved inside the annular groove 32, and the end of the handle 34 passes through the square frame 15. A plurality of ratchet teeth 35 are fixedly connected to the inner wall of the handle 34 in an annular array, and the ratchet teeth 35 are meshed with the ratchet pawl 33. The end of the square frame 15 is fixedly connected with a hydraulic rod 36, and the output shaft of the hydraulic rod 36 is hinged to the end of the handle 34.

[0055] During use, the hydraulic rod 36 works to make the handle 34 perform a reciprocating arc motion, and through the meshing connection or non-meshing sliding connection of the ratchet pawl 33 and the ratchet teeth 35, the cam 31 is caused to rotate, and the end of the push rod 25 is in sliding contact with the right contour surface of the cam 31, causing the four movable cylinders 24 to peristalsis. Among them, through the meshing connection or non-meshing sliding connection of the ratchet pawl 33 and the ratchet teeth 35, the four movable cylinders 24 perform intermittent peristalsis, providing time for filling the second screw 22 with plastic particles.

[0056] The present invention uses the ingenious cooperation of the cam 31, the ratchet pawl 33 and the ratchet teeth 35 through the transmission module 3. The hydraulic rod 36 drives the handle 34 to perform a reciprocating arc motion, causing the cam 31 to rotate intermittently, and then controlling the intermittent peristalsis of the movable cylinder 24; accurately providing sufficient time for filling the second screw 22 with plastic particles, avoiding chaotic material filling, greatly improving the filling accuracy and stability, and optimizing the material conveying rhythm.

[0057] Embodiment 3:

[0058] As Figure 5 and Figure 7As shown, in the embodiment of the present invention, the heating assembly 4 includes a gas transmission pipeline 41. The gas transmission pipeline 41 is fixedly connected to the surface of the left end of the second delivery pipe 12, and the gas transmission pipeline 41 communicates with the second sealing interlayer on the second delivery pipe 12. A plurality of heating elements 42 are slidably connected in a linear array inside the second sealing interlayer on the second delivery pipe 12. The heating element 42 at the right end is hermetically slid in the second sealing interlayer. A plurality of waist-shaped plates 43 are fixedly connected in an annular array on the right side of each heating element 42. A plurality of sliding plates 44 are fixedly connected in an annular array on the left side of each heating element 42. And the convex blocks on the sliding plates 44 are slidably connected inside the waist-shaped plates 43.

[0059] Specifically, by inputting or discharging gas through the gas transmission pipeline 41, a plurality of heating elements 42 are arranged in a linear array or linearly gathered. When the heating elements 42 are arranged in a linear array, the plastic particles sequentially change from hard particles to softened particles and then melt into a solution. When the heating elements 42 are linearly gathered, the plastic particles melt from hard particles into a solution.

[0060] During use, by inputting or discharging gas through the gas transmission pipeline 41, the air pressure in the second sealing interlayer changes, and a plurality of heating elements 42 slide inside the waist-shaped plates 43 through the convex blocks on the sliding plates 44, causing the plurality of heating elements 42 to be arranged in a linear array or linearly gathered. When the plurality of heating elements 42 are arranged in a linear array, the heating range increases, causing the plastic particles between the first screw 21 and the second screw 22 to soften, further improving the extrusion efficiency of the plastic particles. When the plurality of heating elements 42 are linearly gathered, the local temperature of the second delivery pipe 12 increases, improving the melting efficiency of the plastic particles.

[0061] In the present invention, the heating assembly 4 changes the air pressure in the second sealing interlayer through the gas transmission pipeline 41, and flexibly controls the heating elements 42 to be arranged in a linear array or gathered. The linear array arrangement realizes segmented heating, and the plastic particles sequentially experience the hardening, softening, and melting stages, improving the extrusion efficiency in the softening area. The gathered arrangement increases the local temperature and accelerates the melting of the plastic particles, meeting the diverse temperature requirements in different processing stages. Compared with the fixed heating method, the heating efficiency and flexibility are significantly improved.

[0062] Embodiment 4:

[0063] As Figures 8-11As shown, as another embodiment of the present invention, the compression assembly 5 includes a connecting rod 51. The connecting rod 51 is fixedly connected between the first screw rod 21 and the second screw rod 22 and is horizontally coaxial. A pressing ring 52 is slidably sleeved on the surface of the connecting rod 51, and a flow channel is formed between the pressing ring 52 and the connecting rod 51. Moreover, the pressing ring 52 is in movable contact with one of the movable cylinders 24. The inner cavity of the pressing ring 52 is an annular pressing cavity 521. The inner wall of the pressing ring 52 is provided with leakage ports 522 in an annular array. The left inner wall of the connecting rod 51 is provided with a plurality of flow grooves 53 in an annular array, and the flow grooves 53 correspond to the positions of the leakage ports 522. A plurality of stoppers 54 are fixedly connected to the right side of the connecting rod 51 in an annular array, and the stoppers 54 are hermetically adapted to the leakage ports 522.

[0064] Specifically, the pressing ring 52 moves left or right by the accumulation and extrusion of plastic particles and the push of the movable cylinder 24. When moving to the left, it prevents the backflow of the peristaltically discharged particles due to extrusion, improving the filling and filling saturation efficiency after extrusion; when moving to the right, the material cannot flow through the flow channel. The particles on the left side of the pressing ring 52 are continuously accumulated and extruded, making the softened particles compacted, and improving the comprehensiveness of particle softening.

[0065] During use, the first screw rod 21 rotates to convey the material, which accumulates on one side of the pressing ring 52, causing the pressing ring 52 to move to the left on the connecting rod 51. During the movement, the plastic particles flow from the flow channel to the side of the pressing ring 52 close to the first screw rod 21. When the pressing ring 52 moves to the left side of the connecting rod 51, the flow channel is narrowed through the leakage ports 522, causing some plastic particles to be extruded in the flow channel, making them compact, and achieving the saturation effect of particle filling. When the pressing ring 52 moves through one of the movable cylinders 24, causing the pressing ring 52 to move to the right, the extruded plastic particles flow out of the pressing ring 52, and during the sliding process of the pressing ring 52 on the surface of the connecting rod 51, the plastic particles flow out from it. When the pressing ring 52 moves to the right side of the connecting rod 51, the leakage ports 522 are hermetically adapted to the stoppers 54, and the material cannot move out. Moreover, the particles on the left side of the pressing ring 52 are peristaltically moved through a plurality of movable cylinders 24, causing the particles to be turned and extruded into the annular pressing cavity 521, and being continuously extruded to make them compact. When the pressing ring 52 moves to the left, the compacted particles are loaded into the second screw rod 22.

[0066] In the present invention, the pressing ring 52 of the compression assembly 5 moves left and right under the accumulation of the material and the push of the movable cylinder 24. When moving to the left, it prevents the backflow of the peristaltically discharged particles, improving the filling efficiency and saturation degree after extrusion; when moving to the right, it realizes the compaction of the material in the annular pressing cavity 521, comprehensively improving the particle softening effect and compactness, and improving the raw material processing quality.

[0067] Embodiment 5:

[0068] As Figures 1-2As shown, as another embodiment of the present invention, an injection molding machine of a plastic particle preheating device according to the present invention includes a machine tool 6 and a housing 61 arranged on the left side of the top of the machine tool 6. A bracket 62 is fixedly connected to the right side of the top of the machine tool 6, and a hydraulic module 63 is fixedly connected to the left side of the top of the machine tool 6. The hydraulic module 63 located inside the housing 61 has a mold clamping system 64 arranged at its output end, and an injection system 65 is arranged on one side of the mold clamping system 64.

[0069] Working principle: This embodiment provides a plastic particle preheating device and an injection molding machine. When in use, first fill the plastic material into the funnel 14, and then heat the plastic material through an external control system. During use, first close the mold in the mold clamping system 64 through the hydraulic module 63, and the gun head 13 is inserted into the upper hole of the injection system 65.

[0070] Peristaltic use state: First, make the hydraulic rod 36 work through an external circuit mechanism, so that the end of the handle 34 moves in a reciprocating arc shape. At this time, through the meshing connection and non-meshing sliding connection of the ratchet 33 and the ratchet teeth 35, the cam 31 rotates intermittently. At this time, the end of the push rod 25 is in active contact with the contour surface on one side of the cam 31, causing several movable cylinders 24 to move in a wave-like manner, thereby realizing the peristaltic movement of several movable cylinders 24. Then, drive the first screw 21 and the second screw 22 to rotate through the operation of the first motor 23. The peristalsis of the movable cylinder 24 discharges the particles on the second screw 22, causing the material to accumulate and be squeezed to achieve a compacting effect. The first screw 21 rotates to convey the material and accumulates on one side of the extrusion ring 52, causing the extrusion ring 52 to move to the left on the connecting rod 51. During the movement, the plastic particles flow from the flow channel to the side of the extrusion ring 52 close to the first screw 21. When the extrusion ring 52 moves to the left side of the connecting rod 51, the flow channel is narrowed through the leakage port 522, causing some plastic particles to be squeezed in the flow channel to make them compact. And the particles on the left side of the extrusion ring 52 can achieve a saturated effect of particle filling through leftward movement. When the extrusion ring 52 moves through one of the movable cylinders 24, the extrusion ring 52 moves to the right, and the extruded plastic particles flow out of the extrusion ring 52. And during the sliding of the extrusion ring 52 on the surface of the connecting rod 51, the plastic particles flow out from it. When the extrusion ring 52 moves to the right side of the connecting rod 51, the leakage port 522 is hermetically adapted to the stopper 54, and the material cannot be removed. And the particles on the left side of the extrusion ring 52, through the peristalsis of several movable cylinders 24, cause the particles to be turned and squeezed into the annular extrusion cavity 521, and are continuously squeezed to make them compact. When the extrusion ring 52 moves to the left, the compacted particles are loaded into the second screw 22.

[0071] Heating treatment: By conveying or pumping gas in the gas transmission pipeline 41, the air pressure in the second sealing interlayer is caused to change. A number of heating elements 42 slide in the waist-shaped plate 43 through the bumps on the sliding plate 44, causing the number of heating elements 42 to be arranged in a linear array or linearly gathered. When arranged in a linear array, the heating range increases, causing segmented heating treatment to be achieved in the conveying cavity. The plastic particles pass through the hardening zone 72, the softening and heating zone 71, and the melting heating zone 7. And in the softening and heating zone 71, the plastic material is softened, further improving the extrusion efficiency of the plastic particles. When arranged in a gathered manner, the plastic particles pass through the hardening zone 72 and the melting heating zone 7, and the local temperature of the second conveying pipe 12 rises, improving the melting efficiency of the plastic particles.

[0072] The embodiments disclosed in the present invention are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A plastic particle preheating device, comprising a feed rack, a conveying mechanism arranged on the left side of the feed rack, a transmission module, a heating component, and a compression component, characterized in that: The output end of the unloading rack is fixedly connected to a first conveying pipe, a second conveying pipe is fixedly sleeved inside the first conveying pipe, and a second sealing interlayer is arranged on the inner wall of the second conveying pipe; The conveying mechanism comprises a first screw and four movable cylinders arranged inside the unloading rack, and a second screw arranged inside the second conveying pipe; the four movable cylinders move leftward or rightward in sequence, causing the four movable cylinders to move in a peristaltic form, pushing out, turning over, and squeezing the excess material in the two adjacent blades on the second screw; The transmission module comprises a cam rotatably sleeved on the surface of the second conveying pipe, for driving the four movable cylinders to move in a wave-like manner; The heating assembly includes a plurality of heating elements arranged in a linear array inside a second sealed interlayer on a second conveying pipe. The second sealed interlayer supplies or exhausts air, causing the plurality of heating elements to gather or expand. When gathering, the plastic particles melt from hard particles to a solution. When expanding, the plastic particles are segmented. The compression assembly includes an extrusion ring arranged inside the edge of the unloading rack. When the extrusion ring moves to the left, it prevents the extrusion backflow of the peristaltic discharged particles, thereby improving the charging and charging saturation efficiency after extrusion; when it moves to the right, the softened particles on the left are continuously accumulated and squeezed tightly, and the particles on the left are flipped so that the particles are fully softened.

2. A plastic particle preheating device according to claim 1, characterized in that: A first interlayer is formed between the first conveying pipe and the second conveying pipe, the output end of the second conveying pipe is fixedly connected to a gun head, the top of the unloading rack is fixedly connected to a funnel, and the left side of the unloading rack is fixedly connected to a square frame.

3. A plastic particle preheating device according to claim 2, characterized in that: The conveying mechanism also includes a first motor, which is fixedly connected to the right side of the unloading rack, and the output shaft of the first motor passes through the unloading rack and is fixedly connected to the first screw rod. An outer bevel is provided along the end edge of one of the movable cylinders, and inner bevels are provided along the end edges of the other three movable cylinders. One end of the four movable cylinders forms a first sealed cavity with the first interlayer, and one end of the four movable cylinders is fixedly connected to a push rod and passes through one side of the first conveying pipe.

4. A plastic particle preheating device according to claim 3, characterized in that: The first screw is movably sleeved inside the unloading rack, the second screw is movably sleeved inside the second conveying pipe, the blade diameter of the second screw is smaller than the blade diameter of the first screw and they are transversely coaxial, and the four movable cylinders are movably sleeved inside the first interlayer of the first conveying pipe and the second conveying pipe; The compression assembly is located between the first screw and the second screw; The four movable cylinders move leftward or rightward in sequence, causing the four movable cylinders to move in a peristaltic manner, pushing out the excess material in the two adjacent blades on the second screw, causing the plastic particles to turn over, accumulate and squeeze, and thus compact the particles.

5. A plastic particle preheating device according to claim 4, characterized in that: The transmission module also includes an annular groove, which is opened on the cam surface, a pawl is fixedly connected inside the annular groove, a handle is rotatably sleeved inside the annular groove, and the end of the handle passes through the square frame, a plurality of ratchets are fixedly connected to the inner wall of the handle in an annular array, and the ratchets are meshed with the pawl, a hydraulic rod is fixedly connected to the end of the square frame, and the output shaft of the hydraulic rod is hinged to the end of the handle; The end of the push rod is in sliding contact with the right contour surface of the cam; The hydraulic rod works to make the handle do reciprocating arc motion, and through the meshing connection or non-meshing sliding connection between the pawl and the ratchet teeth, the cam rotates intermittently, thereby making the four movable cylinders creep intermittently.

6. A plastic particle preheating device according to claim 5, characterized in that: The heating assembly also includes a gas pipeline, which is fixedly connected to the left end surface of the second delivery pipe and is connected to the second sealing interlayer on the second delivery pipe. The heating element at the right end is sealed and slid in the second sealing interlayer.

7. A plastic particle preheating device according to claim 6, characterized in that: A plurality of waist-shaped plates are fixedly connected to the right side of each heating element in a circular array, and a plurality of sliding plates are fixedly connected to the left side of each heating element in a circular array, and the protrusions on the sliding plates are slidably connected inside the waist-shaped plates; The gas is input or discharged into the second sealed interlayer through the gas pipeline, and the heating elements move, thereby further realizing the linear array arrangement or linear cluster arrangement of the heating elements. When the heating elements are arranged in a linear array, the plastic particles are sequentially transformed from hard particles to softened particles and then melted into a solution; when the heating elements are linearly clustered, the plastic particles are melted from hard particles to a solution.

8. A plastic particle preheating device according to claim 7, characterized in that: The compression assembly also includes a connecting rod, which is fixedly connected between the first screw rod and the second screw rod and is transversely coaxial, and the extrusion ring is slidably sleeved on the surface of the connecting rod.

9. A plastic particle preheating device according to claim 8, characterized in that: A flow channel is formed between the extrusion ring and the connecting rod, and the extrusion ring is in active contact with one of the movable cylinders. The inner cavity of the extrusion ring is an annular extrusion cavity. The inner wall of the extrusion ring is provided with leaks in an annular array. The inner wall on the left side of the connecting rod is provided with a plurality of flow grooves in an annular array, and the flow grooves correspond to the positions of the leaks. The right side of the connecting rod is fixedly connected with a plurality of blocks in an annular array, and the blocks are sealed and adapted to the leaks. The extrusion ring is pushed by the accumulation and extrusion of plastic particles and the movable cylinder, so that the extrusion ring moves to the left or right.

10. An injection molding machine, characterized in that: A plastic particle preheating device comprising the device described in any one of claims 1 to 9.

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