Extrusion mechanism of plastic extruder

Abstract

The invention provides an extrusion mechanism of a plastic extruder, and belongs to the technical field of plastic casting molding, the extrusion mechanism comprises a mounting rack, the mounting rack is provided with a driving module, a mounting box and a machine barrel, and the extrusion mechanism further comprises a mold core, an air delivery pipe, an exhaust pipe, a scraping and scrap blowing assembly and a trigger discharging assembly; by means of cooperation of an air conveying pump, a heat conduction magnetic block and a magnetic scraper, residual materials in a cavity can be effectively cleaned after extrusion operation is completed, and it is ensured that no residual material is left in a machine head; the heat-conducting particles on the outer ring of the heat-conducting magnetic block are mutually matched with the heat-insulating layers of the heat-insulating cavity and the connecting cavity, so that on one hand, the heat transfer efficiency is improved, and on the other hand, the heat is locked to form a stable high-temperature environment, the temperature of gas is increased faster, the high temperature can be kept, excess materials are effectively softened, and the adhesive force is reduced; the excess materials are thoroughly cleaned, the machine head is further guaranteed to be clean, the product quality stability is improved, and meanwhile the time and energy consumption needed by reaching the temperature of melting the excess materials are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of plastic casting molding, in particular to an extrusion mechanism of a plastic extruder. Background Art

[0002] Nowadays, there are many methods for producing and molding some plastic castings. When different plastic castings are produced, different processing methods are often selected according to their own characteristics. Among them, the most common is injection molding, which can meet the production needs of more plastic castings. When the plastic casting production and molding device under the existing technology is producing, the plastic raw material is first crushed, and then the crushed plastic particles are transported to the heating equipment for heating. The plastic particles are molten by heating, and finally the molten plastic is extruded and injected into the mold. The molding device heats and melts the plastic particles and then injects them into the mold, and then forms them after cooling.

[0003] After extrusion is completed, there is usually some plastic residue in the die. This is because during the process of extrusion of the plastic melt through the die, some of the plastic will adhere to the inner wall of the die, the flow channel and the joint of the mold. This is especially true when producing some high-viscosity plastic products, such as PVC pipes and rubber products. The residue is more obvious. If these residual plastics are not cleaned up in time, they will affect the product quality the next time the machine is turned on, such as causing defects on the product surface, reduced dimensional accuracy, etc. Moreover, long-term accumulation may clog the flow channel of the die.

[0004] How to invent an extrusion mechanism of a plastic extruder to solve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In order to make up for the above shortcomings, the present invention provides an extrusion mechanism of a plastic extruder, aiming to solve the problems mentioned in the above background.

[0006] The present invention is achieved in that:

[0007] The present invention provides an extrusion mechanism of a plastic extruder, comprising a mounting frame, on which a driving module, a mounting box and a barrel are mounted, a crushing box is connected to the top of the barrel near the mounting box, a barrel heater is mounted on the outer side of the barrel away from the mounting box, an electric control box is fixedly mounted on the top of the mounting box, a driving shaft is connected to the output end of the driving module, a driving gear is fixedly connected to the driving shaft located inside the mounting box, a crushing device is arranged inside the crushing box, a gear set meshing with the driving gear is arranged inside the mounting box, two gears in the gear set are fixedly sleeved on the connecting shaft of the crushing device, an end of the driving shaft passes through the side wall of the barrel, a screw is fixedly connected to the end of the driving shaft located inside the barrel, a head fixing barrel is mounted on one end of the barrel away from the driving module, a head is fixedly mounted inside the head fixing barrel, a head heater is arranged inside the head, a feeding channel is arranged inside the head, and further comprises:

[0008] Mold core, air supply pipe and exhaust pipe: the air supply pipe and exhaust pipe are fixedly connected to the die head, the mold core is fixed inside the die head through the air supply pipe and exhaust pipe, and forms a cavity for forming the pipe inside the feed channel;

[0009] Scraping and chip blowing assembly: The scraping and chip blowing assembly is arranged inside the die head, and the scraping and chip blowing assembly can scrape off the residual material in the cavity;

[0010] Trigger discharge assembly: The trigger discharge assembly is arranged inside the machine head, and the trigger discharge assembly can assist in discharging the residual material in the middle of the feed channel after the scraper and chip blower assembly works.

[0011] Preferably, the scraper and chip blowing assembly includes a connecting spring, a connecting cavity, a magnetic scraper and two insulation cavities. The upper end of the air pipe is connected to an external air pump, and the two insulation cavities are connected through a connecting cavity. The lower end of the air pipe extends into the insulation cavity on the upper side, and the upper end of the exhaust pipe extends into the insulation cavity on the lower side. The magnetic scraper is slidably mounted on the mold core, and the side walls of the magnetic scraper are respectively abutted against the side walls of the mold core and the cavity, and the moving range of the magnetic scraper can cover the entire cavity.

[0012] Preferably, a heat-conducting magnetic block is slidably arranged in the heat-insulating cavity, and the side wall of the heat-conducting magnetic block facing the connecting cavity is elastically connected to the heat-insulating cavity through a connecting spring, and a vent hole is provided through the middle of the heat-conducting magnetic block, and an installation cavity three is provided inside the machine head, and an electromagnet is installed in the installation cavity three, and a connecting rod is fixedly connected to the side wall of the magnetic scraper, and the end of the connecting rod passes through the side wall of the machine head, and a through hole matching the connecting rod is provided inside the electromagnet, and the electromagnet is used to fix the connecting rod, and a material guide port is provided through the magnetic scraper.

[0013] Preferably, the gas delivery pipe and the exhaust pipe are symmetrically arranged; when the gas delivery pump is not started, the side wall of the thermal conductive magnetic block is against the side wall of the gas delivery pipe, and the electromagnet is in a powered-on state; when the gas delivery pump is started, the electromagnet is in a powered-off state.

[0014] Preferably, the heat-conducting magnetic block and the magnetic scraper are arranged with different polarities, and the magnetic force between the heat-conducting magnetic block and the magnetic scraper is greater than the friction force between the magnetic scraper and the cavity.

[0015] Preferably, the outer ring of the thermally conductive magnetic block is provided with thermally conductive particles, and the inner cavities of the thermal insulation cavity and the connecting cavity are coated with a thermal insulation layer.

[0016] Preferably, a solenoid valve is installed on the exhaust pipe, and a branch pipe is connected to the side wall of the exhaust pipe, the inner cavity of the branch pipe is connected to the middle inner cavity of the feed channel, a bracket is fixedly installed inside the branch pipe, a support rod is slidably connected inside the bracket, the end of the support rod close to the middle inner cavity of the feed channel is fixedly connected to a ball plug, the end of the support rod away from the ball plug is fixedly connected to a pressure plate, the inner side wall of the exhaust pipe corresponding to the branch pipe is fixedly connected to an inclined baffle, and the ball plug and the side wall of the bracket are elastically connected via a thermal spring.

[0017] Preferably, after the extrusion operation is completed, the air pump is started, and the operation of the air pump is divided into two states: stage ventilation and continuous ventilation. During stage ventilation, the solenoid valve is in an open state, and the ball plug completely blocks the port of the branch pipe; during continuous ventilation, the solenoid valve is in a closed state, and the port of the branch pipe is in an open state.

[0018] Preferably, the trigger discharge assembly comprises installation cavity one, installation cavity two, a discharge trough, a rotating wheel and a trigger switch, the trigger switch is fixedly connected to the bracket and faces the side of the inclined baffle, a motor is installed in the installation cavity one, a bevel gear set is arranged in the installation cavity two, the ends of the discharge trough respectively penetrate the middle inner cavity of the feed channel, the machine head and the side walls of the machine head fixing cylinder, the rotating wheel is rotatably arranged in the discharge trough, the bevel gear set is respectively sleeved on the output shaft of the motor and the connecting shaft of the rotating wheel, and a discharge opening matching the discharge trough is opened inside the rotating wheel.

[0019] Preferably, the trigger switch is electrically connected to the motor. When the motor is started, the rotation angle of the discharge port is 90 degrees, and the discharge trough is connected to the middle inner cavity of the feed channel; during the extrusion operation, the motor rotates in the opposite direction, and the rotor re-blocks the discharge trough.

[0020] The beneficial effects of the present invention are:

[0021] The drive shaft is driven to rotate by the drive module, and the crushing device crushes the raw materials and the screw conveys the plastic melt through gear transmission, so that the raw materials can be crushed and refined before entering the die, which is more conducive to subsequent plasticization and molding, ensuring the continuity and efficiency of the entire extrusion process and improving production efficiency. The cavity formed by the mold core, air pipe and exhaust pipe in the die feed channel effectively constrains the plastic melt, so that the melt can flow accurately around the mold core and gradually form into the shape of the pipe, ensuring the accuracy and stability of the shape and size of the pipe product to meet diverse production needs.

[0022] The scraping and chip blowing assembly, with the help of the ingenious cooperation of the air pump, the heat-conducting magnetic block and the magnetic scraper, can effectively clean the residual material inside the cavity after the extrusion operation is completed. Especially during the ventilation stage of the air pump, the magnetic scraper can be reciprocated by the intermittent push of the gas, which greatly improves the thoroughness and efficiency of the scraping, significantly reduces the workload and time cost of manual cleaning, ensures the cleanliness of the cavity inside the die, and is conducive to the stability of product quality during the next extrusion operation. During the continuous ventilation stage, the gas can enter the feed channel and the cavity through the branch pipe, and comprehensively blow and clean the residual material and dust, further remove the residual material, make the entire residual material cleaning effect more comprehensive, and ensure that there are no hidden dangers of residual material inside the die.

[0023] The heat-conducting particles on the outer ring of the heat-conducting magnetic block cooperate with the insulation layer of the insulation chamber and the connecting chamber to improve the heat transfer efficiency on the one hand, and lock the heat to form a stable high-temperature environment on the other hand, so that the gas can heat up faster and maintain high temperature, effectively soften the residual material and reduce adhesion, and then combine the scraping of the magnetic scraper and the blowing force of the gas to achieve thorough cleaning of the residual material, further ensure the cleanliness of the machine head, and improve the stability of product quality. At the same time, it also reduces the time and energy consumption required to reach the melting temperature of the residual material, and improves the energy utilization efficiency of residual material cleaning; the trigger discharge component realizes the automatic triggering of the residual material cleaning process, relying on the effect of the heated gas in the insulation chamber on thermistor springs, ball plugs and other components. After reaching the corresponding temperature conditions, the discharge chute can be automatically opened to discharge the residual material without manual intervention, which improves the cleaning efficiency and avoids the residual material residue caused by untimely manual operation. The impact of the next use of the equipment is avoided, reducing the manual operation cost and labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1It is a schematic diagram of the overall structure of an extrusion mechanism of a plastic extruder provided by the present invention;

[0026] Figure 2 It is a schematic diagram of a crushing device and a gear set structure of an extrusion mechanism of a plastic extruder provided by the present invention;

[0027] Figure 3 It is a front cross-sectional structural schematic diagram of an extrusion mechanism of a plastic extruder provided by the present invention;

[0028] Figure 4 The invention provides an extrusion mechanism of a plastic extruder. Figure 3 The enlarged structural diagram at A in the middle;

[0029] Figure 5 The invention provides an extrusion mechanism of a plastic extruder. Figure 4 The enlarged structural diagram at B in the middle;

[0030] Figure 6 It is a partial schematic diagram of the cross-sectional structure of an extrusion mechanism of a plastic extruder provided by the present invention;

[0031] Figure 7 The invention provides an extrusion mechanism of a plastic extruder. Figure 6 The enlarged structural diagram at C in the middle;

[0032] Figure 8 It is a schematic diagram of a head fixing barrel and a head structure of an extrusion mechanism of a plastic extruder provided by the present invention;

[0033] Fig. 9 It is a schematic diagram of the explosion structure at the head of an extrusion mechanism of a plastic extruder provided by the present invention;

[0034] Fig.10 It is a schematic diagram of the cross-sectional structure of the extrusion mechanism head of a plastic extruder provided by the present invention;

[0035] Fig.11 The invention provides a schematic diagram of the structure of an electromagnet and a magnetic scraper of an extrusion mechanism of a plastic extruder.

[0036] In the figure: 1, mounting frame; 2, driving module; 3, mounting box; 4, crushing box; 5, barrel; 6, head fixing barrel; 7, air pipe; 8, heat conductive magnetic block; 9, branch pipe; 10, electric control box; 21, driving shaft; 22, driving gear; 23, gear set; 41, crushing device; 51, screw; 52, barrel heating element; 61, head; 62, mold core; 63, cavity; 64, head heating element; 65, installation cavity 1; 66, installation cavity 2; 67, discharge chute; 68, Rotor; 71, exhaust pipe; 72, insulation chamber; 73, connecting chamber; 81, connecting spring; 91, bracket; 92, support rod; 93, thermal spring; 94, trigger switch; 611, feed channel; 631, magnetic scraper; 632, guide port; 633, connecting rod; 634, electromagnet; 635, installation chamber three; 651, motor; 652, bevel gear set; 681, discharge port; 711, inclined baffle; 712, solenoid valve; 921, pressure plate; 922, ball plug. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1, refer to Figure 1-Figure 11, an extrusion mechanism of a plastic extruder, including a mounting frame 1, on which a driving module 2, a mounting box 3 and a barrel 5 are mounted, a crushing box 4 is connected to the top of the barrel 5 near the mounting box 3, a barrel heating element 52 is mounted on the outer side of the barrel 5 away from the mounting box 3, an electric control box 10 is fixedly arranged on the top of the mounting box 3, a driving shaft 21 is connected to the output end of the driving module 2, a driving gear 22 is fixedly connected to the driving shaft 21 located inside the mounting box 3, a crushing device 41 is arranged in the crushing box 4, a gear set 23 meshing with the driving gear 22 is arranged in the mounting box 3, two gears in the gear set 23 are fixedly sleeved on the connecting shaft of the crushing device 41, an end of the driving shaft 21 passes through the side wall of the barrel 5, and is located in the machine The end of the driving shaft 21 inside the barrel 5 is fixedly connected with a screw 51, and a head fixing barrel 6 is installed at one end of the barrel 5 away from the driving module 2. A head 61 is fixedly installed in the head fixing barrel 6, and a head heating element 64 is arranged in the head 61. A feed channel 611 is arranged in the head 61. When working, the driving module 2 drives the driving shaft 21 to rotate, drives the driving gear 22 to rotate, and transmits power to the crushing device 41 through the gear set 23 to crush the raw materials. At the same time, the screw 51 at the end of the driving shaft 21 rotates in the barrel 5 to transport the plastic melt to the feed channel 611 at the head 61. The barrel heating element 52 and the head heating element 64 provide a suitable temperature for the plasticization and molding of the raw materials, melting them into plastic melts. It also includes:

[0039] The mold core 62, the air pipe 7 and the exhaust pipe 71: the air pipe 7 and the exhaust pipe 71 are fixedly connected to the die 61, and the mold core 62 is fixed inside the die 61 through the air pipe 7 and the exhaust pipe 71, which ensures the stability of the mold core 62 in the die 61, so that it can maintain a precise position during the pipe extrusion process, and form a cavity 63 for molding the pipe inside the feed channel 611. The feed channel 611 is the main channel for the plastic melt to enter the die 61. The mold core 62 is inside the feed channel 611, and the mold cavity 63 is formed by its own shape and relative position relationship with the feed channel 611, and the surrounding structure. When the plastic melt is pushed from the barrel 5 into the feed channel 611 by the screw 51, under the constraint of the cavity 63, the melt flows around the mold core 62 and is gradually formed into the shape of the pipe;

[0040] Scraping and chip blowing assembly: The scraping and chip blowing assembly is arranged inside the die head 61, and the scraping and chip blowing assembly can scrape off the residual material in the cavity 63;

[0041] Trigger discharge assembly: The trigger discharge assembly is arranged inside the machine head 61, and the trigger discharge assembly can assist in discharging the residual material in the middle of the feed channel 611 after the scraper and chip blower assembly works.

[0042] Furthermore, the scraper and chip blowing assembly includes a connecting spring 81, a connecting cavity 73, a magnetic scraper 631 and two insulation cavities 72. The upper end of the air pipe 7 is connected to an external air pump. The two insulation cavities 72 are connected through the connecting cavity 73. The lower end of the air pipe 7 extends to the insulation cavity 72 on the upper side. The upper end of the exhaust pipe 71 extends to the insulation cavity 72 on the lower side. The magnetic scraper 631 is slidably sleeved on the core 62. The side walls of the magnetic scraper 631 are respectively abutted against the side walls of the core 62 and the cavity 63. The moving range of the magnetic scraper 631 can cover the entire cavity 63, ensuring that when the magnetic scraper 631 moves, the residual material on the core 62 and the cavity 63 can be effectively scraped off.

[0043] A heat-conducting magnetic block 8 is slidably arranged in the heat-insulating chamber 72, and the side wall of the heat-conducting magnetic block 8 facing the connecting chamber 73 is elastically connected to the heat-insulating chamber 72 via a connecting spring 81. A vent is provided through the middle of the heat-conducting magnetic block 8 to provide a channel for the circulation of gas. An installation cavity three 635 is provided inside the machine head 61, and an electromagnet 634 is installed in the installation cavity three 635. A connecting rod 633 is fixedly connected to the side wall of the magnetic scraper 631, and an end of the connecting rod 633 passes through the side wall of the machine head 61. A through hole matching the connecting rod 633 is provided inside the electromagnet 634, and the electromagnet 634 is used to fix the connecting rod 633. A material guide port 632 is provided through the magnetic scraper 631 to provide a channel for the discharge of gas and residual material.

[0044] It should be noted that the gas supply pipe 7 and the exhaust pipe 71 are symmetrically arranged; when the gas pump is not started, the side wall of the thermal conductive magnetic block 8 is against the side wall of the gas supply pipe 7, and the electromagnet 634 is in a powered-on state, at which time the position of the magnetic scraper 631 is fixed; when the gas pump is started, the electromagnet 634 is in a powered-off state, at which time the magnetic scraper 631 is released from the limit; the thermal conductive magnetic block 8 and the magnetic scraper 631 are set with different polarities, and the magnetic force between the thermal conductive magnetic block 8 and the magnetic scraper 631 is greater than the friction force between the magnetic scraper 631 and the cavity 63, ensuring that when the gas pushes the thermal conductive magnetic block 8 to move, under the action of the magnetic force between the two, the magnetic scraper 631 can move with the thermal conductive magnetic block 8, and then can scrape off the excess material on the core 62 and the cavity 63.

[0045] It should be noted that, compared with the material of the machine head 61 (generally alloy steel, etc.), the hardness of the magnetic scraper 631 is relatively low, and the internal structure and surface finish of the machine head 61 will not be damaged when moving back and forth.

[0046] Furthermore, an electromagnetic valve 712 is installed on the exhaust pipe 71 to control the opening and closing state of the exhaust pipe 71. A branch pipe 9 is connected to the side wall of the exhaust pipe 71. The inner cavity of the branch pipe 9 is connected to the middle inner cavity of the feed channel 611. A bracket 91 is fixedly installed inside the branch pipe 9. A support rod 92 is slidably connected inside the bracket 91. A ball plug 922 is fixedly connected to the end of the support rod 92 close to the middle inner cavity of the feed channel 611, and a pressure plate 921 is fixedly connected to the end of the support rod 92 away from the ball plug 922. An inclined baffle 711 is fixedly connected to the inner wall of the exhaust pipe 71 corresponding to the branch pipe 9 for guiding airflow. The ball plug 922 and the side wall of the bracket 91 are elastically connected via a thermal spring 93.

[0047] It should be noted that after the extrusion operation is completed, the air delivery pump is started. The operation of the air delivery pump is divided into two states: stage ventilation and continuous ventilation. During stage ventilation, the solenoid valve 712 is in an open state, and the ball plug 922 completely blocks the port of the branch pipe 9. At this time, during ventilation, the magnetic scraper 631 moves to the left under the push of the gas. When ventilation is no longer required, the magnetic scraper 631 moves to the right and resets under the action of the connecting spring 81, and the gas is discharged through the exhaust pipe 71. The stage ventilation of the gas can realize the magnetic scraper 63 1 reciprocates, thereby effectively scraping off the residual material on the core 62 and the cavity 63; when ventilation is continuous, the solenoid valve 712 is in a closed state, and the port of the branch pipe 9 is in an open state. At this time, the gas cannot be discharged through the exhaust pipe 71. Under the action of the inclined baffle 711 and the solenoid valve 712, the gas will be discharged through the branch pipe 9. At this time, the gas will push the ball plug 922 to move to the left to open the port of the branch pipe 9. At this time, the gas can blow and clean the residual material and dust in the feed channel 611 and the cavity 63.

[0048] In particular, during the extrusion operation, even if the thermistor spring 93 is heated, the ball plug 922 still blocks the branch pipe 9, effectively preventing the plastic melt from entering the inside of the branch pipe 9, avoiding the blockage of the branch pipe 9 due to solidification or residue of the melt, and ensuring the normal function and service life of the exhaust pipe 71 and related structures.

[0049] In this embodiment, during normal extrusion operation: during the extrusion operation, the plastic melt is pushed from the barrel 5 by the screw 51, passes through the feed channel 611, and enters the cavity 63 through the material guide port 632, and is formed into a pipe around the mold core 62 under the constraint of the cavity 63. At this time, the air pump is not started, the side wall of the thermal conductive magnetic block 8 is against the side wall of the air pipe 7, the electromagnet 634 is in an energized state, and the magnetic scraper 631 is fixed and will not move in the cavity 63.

[0050] For the exhaust pipe 71 and the branch pipe 9, even though the thermistor spring 93 may be heated by the heat of the barrel 5 and the die head 61, since no gas enters the branch pipe 9 from the exhaust pipe 71 to push the ball plug 922, and the ball plug 922 is under the elastic force of the thermistor spring 93 (the elastic force is sufficient to block the branch pipe 9 in the initial state), the ball plug 922 can still block the port of the branch pipe 9, thereby preventing the plastic melt from entering the interior of the branch pipe 9 and ensuring the normal progress of the pipe extrusion process.

[0051] After the extrusion operation is completed - during the air delivery pump stage: the air delivery pump is started, the electromagnet 634 is powered off, the fixation of the magnetic scraper 631 is released, and the gas enters the upper insulation chamber 72 through the air delivery pipe 7, pushing the heat conductive magnetic block 8 to overcome the elastic force of the connecting spring 81 and move toward the connecting chamber 73. Since the heat conductive magnetic block 8 and the magnetic scraper 631 are set with different polarities, and the magnetic force is greater than the friction between the magnetic scraper 631 and the cavity 63, the movement of the heat conductive magnetic block 8 will drive the magnetic scraper 631 to slide to the left on the mold core 62, and the side wall of the magnetic scraper 631 will scrape off the mold cavity 63. The residual material in the cavity 63, at the same time, the solenoid valve 712 on the exhaust pipe 71 is in the open state, and the gas can be discharged from the exhaust pipe 71. During the stage ventilation process, the push and stop of the gas will cause the thermal conductive magnetic block 8 and the magnetic scraper 631 to reciprocate. Because the magnetic scraper 631 moves to the left during ventilation, when the ventilation is stopped, under the action of the connecting spring 81, the thermal conductive magnetic block 8 and the magnetic scraper 631 move to the right and reset. Through the stage ventilation of the gas, the reciprocating movement of the magnetic scraper 631 can be realized, thereby effectively scraping off the residual material on the core 62 and the cavity 63.

[0052] For the branch pipe 9, the gas pressure during ventilation at this stage will not move the ball plug 922, because the solenoid valve 712 is open, and the gas is mainly discharged from the exhaust pipe 71. The ball plug 922 still blocks the port of the branch pipe 9 to prevent the gas from entering the middle of the feed channel 611.

[0053] After the extrusion operation is completed - when the air pump continues to ventilate: the solenoid valve 712 is closed, the gas continues to accumulate in the heat preservation chamber 72, further pushing the heat conductive magnetic block 8 to move, and the magnetic scraper 631 continues to scrape the material, and finally it is in a relatively static state (refer to Figure 6 ), since the outlet of the exhaust pipe 71 is closed, the gas cannot be discharged through the exhaust pipe 71. Under the guidance of the inclined baffle 711, the gas is discharged through the branch pipe 9. At this time, the gas pushes the ball plug 922 to overcome the elastic force of the thermal spring 93 and move to the left, opening the port of the branch pipe 9. The opened branch pipe 9 allows the gas to enter the feed channel 611 and the cavity 63, blow and clean the remaining material and dust, and further remove the residual material. This part of the material will be discharged from the cavity 63 through the guide port 632 to ensure the cleanliness of the inside of the machine head 61.

[0054] The scraper and chip blowing assembly utilizes the ingenious cooperation of the air pump, the heat-conducting magnetic block 8 and the magnetic scraper 631 to effectively scrape off the residual material in the cavity 63 after the extrusion operation is completed, especially during the ventilation stage of the air pump. The reciprocating movement of the magnetic scraper 631 is achieved through the intermittent push of the gas, which greatly improves the thoroughness and efficiency of the scraping, reduces the workload and time cost of manual cleaning, ensures the cleanliness of the cavity 63 inside the head 61, and is beneficial to the stability of product quality during the next extrusion operation; during continuous ventilation, the gas enters the feed channel 611 and the cavity 63 through the branch pipe 9 to blow and clean the residual material and dust, further removes the residual material, and makes the cleaning effect more comprehensive.

[0055] In the second embodiment, the outer ring of the thermal conductive magnetic block 8 is provided with thermal conductive particles (such as copper particles, etc.), and its thermal conductivity is much higher than that of the gas, which can significantly improve the heat transfer efficiency between the thermal conductive magnetic block 8 and the surrounding gas. During the reciprocating movement of the thermal conductive magnetic block 8, friction is continuously generated with the inner wall of the thermal insulation chamber 72. According to the principle of frictional heat generation, mechanical energy will be converted into thermal energy, so that the temperature inside the thermal insulation chamber 72 increases. Since the thermal insulation chamber 72 itself is coated with an insulation layer, the rate of heat dissipation to the outside is very low, so this part of the heat generated by friction can be continuously accumulated in the chamber, and this frictional heat generation and the heat transferred from the thermal conductive magnetic block 8 work together to further increase the temperature inside the thermal insulation chamber 72, which helps to maintain the gas in the chamber at a relatively high and stable temperature state. The inner cavity of the thermal insulation chamber 72 and the connecting cavity 73 is coated with an insulation layer, which is usually composed of a material with a very low thermal conductivity (such as ceramic fiber, rock wool and other insulation materials), which can effectively block Heat is transferred outward. These materials have a large number of tiny pores or special structures inside, which can greatly hinder the heat from being transferred outward through heat conduction, convection, and thermal radiation. After the gas enters the insulation chamber 72, whether it is the heat carried by the initial gas or the heat generated by the friction of the thermal conductive magnetic block 8 later, it can be effectively "locked" in the chamber, reducing the heat exchange with the external environment. In addition, after the extrusion operation is completed, although the head heating element 64 stops actively heating, a part of the heat will still remain. Due to the existence of the insulation layer, this part of the residual heat will not be quickly dissipated to the outside, but most of it will be retained in the insulation chamber 72. This is equivalent to reserving a certain amount of "heat reserve" for the entire system. When the scraping and chip blowing component is started later, it can assist in raising the initial temperature in the insulation chamber 72, so that the gas heats up faster. The heated gas can melt the plastic residue, and the blowing force of the auxiliary gas can make it easier to discharge the residue.

[0056] In this embodiment, when the gas enters the insulation chamber 72, the process of frictional heat generation is as follows: in the process of the heat-conducting magnetic block 8 being pushed back and forth by the gas, it continuously rubs against the inner wall of the insulation chamber 72. According to the principle of frictional heat generation, mechanical energy is converted into thermal energy. The heat generated by this friction increases the energy inside the insulation chamber 72. Since the insulation chamber 72 is coated with an insulation layer, the heat is difficult to dissipate to the outside, so the heat generated by friction accumulates in the chamber. The setting of the heat-conducting particles can better transfer the heat of the insulation layer to the gas.

[0057] Barrier effect of the insulation layer: The insulation layer (such as ceramic fiber, rock wool and other materials) in the insulation cavity 72 and the connecting cavity 73 has a special structure. The tiny pores or special structure inside it can effectively prevent heat from being transferred to the outside through heat conduction, convection and thermal radiation. This makes the initial heat of the gas after entering the insulation cavity 72, the heat transferred by the thermal conductive magnetic block 8 and the heat generated by friction all "locked" in the cavity, forming a relatively stable high-temperature environment.

[0058] It should be noted that after the extrusion operation is completed, although the head heating element 64 stops active heating, some heat still remains. Due to the existence of the insulation layer, this part of heat will not be quickly dissipated to the outside, but most of it will be retained in the insulation chamber 72. The retained heat becomes the "heat reserve" of the system. This part of heat can help increase the initial temperature in the insulation chamber 72. When the air pump is started, the gas can heat up faster, thereby reaching a temperature that can melt the plastic residue more quickly, thereby improving the efficiency of residue cleaning and reducing the time and energy consumption required for cleaning.

[0059] During the above-mentioned heat transfer and accumulation process, the gas temperature in the insulation chamber 72 continues to rise and remains at a relatively high and stable state. When cleaning the residual material, the higher temperature helps to melt the plastic residual material. When the gas pushes the heat-conducting magnetic block 8 to drive the magnetic scraper 631 to scrape off the residual material, the heat generated by friction heats the residual material in the cavity 63 to soften it, thereby reducing the adhesion between the residual material and the mold core 62 or the cavity 63. After the branch pipe 9 is opened in the continuous ventilation stage, the high-temperature gas can also enter the feed channel 611 and the cavity 63 to blow and clean the residual material and dust. Under the action of the gas blowing force, the softened residual material is more easily removed from the mold core 62 and the cavity 63, and discharged through the material guide port 632 on the magnetic scraper 631. The residual material is further discharged from the machine head 61 with the help of the high temperature and airflow to ensure the cleanliness of the inside of the machine head 61.

[0060] The frictional heat generated and the heat-conducting particles cooperate to increase the temperature of the gas in the insulation chamber 72 and stabilize it, which can effectively soften the plastic residue and reduce the adhesion between the residue and the mold core 62 and the cavity 63. With the scraping of the magnetic scraper 631 and the gas blowing force, the residue can be thoroughly cleaned, the internal cleanliness of the head 61 is guaranteed, and the stability of product quality when the equipment is running again is improved; the high-temperature gas enters the feed channel 611 and the cavity 63 during the continuous ventilation stage, and the residue and dust are comprehensively blown and cleaned, further improving the effect and efficiency of the residue cleaning; the insulation layer retains the residual heat of the head heating element 64 as a "heat reserve", which can assist the gas to heat up quickly when the air pump is started, reducing the time and energy consumption required to reach the temperature for melting the residue, thereby improving the energy utilization efficiency of the residue cleaning, and the rapid heating enables the entire residue cleaning process to be carried out more quickly, shortening the equipment downtime for maintenance, thereby improving the overall production efficiency of the plastic extruder.

[0061] Example 3, refer to Figure 3-Figure 11 , trigger discharge assembly installation cavity 1 65, installation cavity 2 66, discharge trough 67, rotating wheel 68 and trigger switch 94, trigger switch 94 is fixedly connected to bracket 91 and faces the side of inclined baffle 711, motor 651 is installed in installation cavity 1 65, bevel gear set 652 is arranged in installation cavity 2 66, ends of discharge trough 67 respectively penetrate the middle inner cavity of feed channel 611, machine head 61 and side wall of machine head fixing cylinder 6, rotating wheel 68 is arranged to rotate in discharge trough In 67, the bevel gear set 652 is respectively sleeved on the output shaft of the motor 651 and the connecting shaft of the rotating wheel 68. When the motor 651 is started, the rotating wheel 68 can be controlled to rotate under the drive of the bevel gear set 652. A discharge opening 681 matching the discharge trough 67 is opened inside the rotating wheel 68. When the discharge opening 681 is parallel to the discharge trough 67, the discharge trough 67 is opened. When the discharge opening 681 is perpendicular to the discharge trough 67, the discharge trough 67 is closed.

[0062] In particular, during the cleaning process, as the temperature inside the insulation chamber 72 increases, the temperature of the gas flowing through it will also increase accordingly. When the solenoid valve 712 is closed, the gas with increased temperature will pass through the branch pipe 9. On the one hand, this part of the gas can push open the ball plug 922 to connect the branch pipe 9 with the middle cavity of the feed channel 611. On the other hand, as the gas continues to flow, this part of the heated gas will gradually heat up the thermistor spring 93. At this time, the elastic coefficient of the thermistor spring 93 will decrease. Under the push of the gas, the distance that the ball plug 922 drives the support rod 92 to move will increase. At this time, the pressure plate 921 fixedly connected to the support rod 92 will contact the trigger switch 94, thereby turning on the motor 651. At this time, since the gas is constantly spraying outward, plastic residue or dust cannot enter the inside of the branch pipe 9.

[0063] It should be noted that the trigger switch 94 is electrically connected to the motor 651. When the trigger switch 94 is squeezed, the motor 651 will be triggered to start. When the motor 651 starts, the rotation angle of the discharge port 681 is 90 degrees, and the discharge trough 67 is connected to the middle inner cavity of the feed channel 611. At this time, the discharge trough 67 is open, and the remaining melted material inside the middle inner cavity of the feed channel 611 will be discharged from the machine head 61 through the discharge trough 67; during the extrusion operation, the motor 651 rotates in the opposite direction, and the wheel 68 re-blocks the discharge trough 67. At this time, the plastic melt cannot be discharged through the discharge trough 67, ensuring the normal progress of the extrusion operation.

[0064] In this embodiment, during the cleaning process, when the solenoid valve 712 is closed, the gas with increased temperature in the insulation chamber 72 passes through the branch pipe 9. This part of the high-temperature gas has sufficient pressure to push open the ball plug 922, so that the branch pipe 9 is connected to the middle cavity of the feed channel 611, allowing the gas to enter the feed channel 611 and the cavity 63 and other parts for blowing and cleaning.

[0065] As the gas continues to flow, its heat is transferred to the thermistor spring 93 to heat it up, and the elastic coefficient of the thermistor spring 93 decreases accordingly. When the gas pushes the ball plug 922 to drive the support rod 92 to move, the elastic coefficient becomes smaller and the moving distance of the support rod 92 increases, thereby enabling the pressure plate 921 fixedly connected to the support rod 92 to contact the trigger switch 94. Because there is an electrical connection between the trigger switch 94 and the motor 651, once the trigger switch 94 is squeezed, the motor 651 will be triggered to start.

[0066] After the motor 651 is started, the bevel gear set 652 drives the wheel 68 to rotate, and the discharge port 681 of the wheel 68 rotates 90 degrees, so that the discharge port 681 is parallel to the discharge trough 67, thereby opening the discharge trough 67. At this time, the residual material in the middle inner cavity of the feed channel 611 that has been softened by the high-temperature gas will be smoothly discharged from the machine head 61 through the discharge trough 67 under the action of gravity and gas blowing force, thereby achieving effective cleaning of the residual material.

[0067] During the extrusion operation stage, the motor 651 rotates in the opposite direction, driving the runner 68 to rotate in the opposite direction, so that the discharge port 681 of the runner 68 is perpendicular to the discharge groove 67, so that the runner 68 re-blocks the discharge groove 67. At this time, the plastic melt flows normally in the head 61. Since the discharge groove 67 is blocked, the plastic melt cannot be discharged through the discharge groove 67, ensuring that the extrusion operation can be carried out according to the normal process and ensuring the normal molding of plastic products such as pipes.

[0068] This component realizes the automatic triggering of the residual material cleaning process without manual intervention. As long as the corresponding temperature conditions are reached during the cleaning process, the discharge slot 67 can be automatically opened to discharge the residual material, which improves the cleaning efficiency, reduces the manual operation cost and labor intensity, and also avoids the problem of residual material residue affecting the next use of the equipment due to untimely manual operation; when the residual material needs to be cleaned, it ensures that the discharge slot 67 can be opened smoothly to discharge the residual material, and during the extrusion operation, the discharge slot 67 is reliably blocked to prevent the leakage of the plastic melt, thereby ensuring the orderly and stable progress of the entire extrusion process and the residual material cleaning process, which helps to improve the product quality and the reliability of the equipment operation; with the help of the high temperature characteristics of the gas in the insulation chamber 72, not only its heat is used to soften the residual material, but also the ball plug 922 is pushed open by the gas flow and the subsequent discharge action is triggered, thereby realizing multiple effective utilizations of heat and airflow in the residual material cleaning process, further optimizing the cleaning effect, ensuring that the inside of the head 61 can be cleaned more thoroughly, and creating good conditions for the next round of extrusion operation.

[0069] It should be noted that the specific models and specifications of the motor 651, air pump, solenoid valve 712, electromagnet 634, and thermal spring 93 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An extrusion mechanism of a plastic extruder, comprising a mounting frame (1), on which a driving module (2), a mounting box (3) and a barrel (5) are mounted, a crushing box (4) is arranged on the top of the barrel (5) close to the mounting box (3), a barrel heating element (52) is arranged on the outer side of the barrel (5) away from the mounting box (3), an electric control box (10) is fixedly arranged on the top of the mounting box (3), an output end of the driving module (2) is connected to a driving shaft (21), a driving gear (22) is fixedly connected to the driving shaft (21) located inside the mounting box (3), a crushing device (41) is arranged in the crushing box (4), and the mounting frame (10) is provided with a plurality of screws. A gear set (23) meshing with the driving gear (22) is arranged in the box (3), two gears in the gear set (23) are fixedly sleeved on the connecting shaft of the crushing device (41), the end of the driving shaft (21) passes through the side wall of the barrel (5), the end of the driving shaft (21) located inside the barrel (5) is fixedly connected with a screw (51), and a head fixing cylinder (6) is installed at one end of the barrel (5) away from the driving module (2), a head (61) is fixedly installed in the head fixing cylinder (6), a head heating element (64) is arranged in the head (61), and a feeding channel (611) is arranged in the head (61), characterized in that: Also includes: A mold core (62), an air supply pipe (7) and an exhaust pipe (71): the air supply pipe (7) and the exhaust pipe (71) are fixedly connected to the die head (61); the mold core (62) is fixed inside the die head (61) through the air supply pipe (7) and the exhaust pipe (71), and a mold cavity (63) for molding a pipe is formed inside the feed channel (611); A scraper and chip blower assembly: the scraper and chip blower assembly is arranged inside the die head (61), and the scraper and chip blower assembly can scrape off the residual material in the cavity (63); Trigger discharge assembly: The trigger discharge assembly is arranged inside the machine head (61), and the trigger discharge assembly can assist in discharging the residual material in the middle of the feed channel (611) after the scraper and chip blower assembly is working.

2. The extrusion mechanism of a plastic extruder according to claim 1, characterized in that: The scraper and chip blowing assembly comprises a connecting spring (81), a connecting cavity (73), a magnetic scraper (631) and two heat-insulating cavities (72); the upper end of the air supply pipe (7) is connected to an external air supply pump; the two heat-insulating cavities (72) are connected via the connecting cavity (73); the lower end of the air supply pipe (7) extends into the heat-insulating cavity (72) on the upper side; the upper end of the exhaust pipe (71) extends into the heat-insulating cavity (72) on the lower side; the magnetic scraper (631) is slidably sleeved on the mold core (62); the side walls of the magnetic scraper (631) are respectively abutted against the side walls of the mold core (62) and the cavity (63); and the moving range of the magnetic scraper (631) can cover the entire cavity (63).

3. The extrusion mechanism of a plastic extruder according to claim 2, characterized in that: A heat-conducting magnetic block (8) is slidably arranged in the heat-insulating chamber (72); the side wall of the heat-conducting magnetic block (8) facing the connecting chamber (73) is elastically connected to the heat-insulating chamber (72) via a connecting spring (81); a vent hole is provided through the middle of the heat-conducting magnetic block (8); a mounting chamber three (635) is provided inside the machine head (61); an electromagnet (634) is installed in the mounting chamber three (635); a connecting rod (633) is fixedly connected to the side wall of the magnetic scraper (631); an end of the connecting rod (633) passes through the side wall of the machine head (61); a through hole matching the connecting rod (633) is provided inside the electromagnet (634); the electromagnet (634) is used to fix the connecting rod (633); and a material guide port (632) is provided through the magnetic scraper (631).

4. The extrusion mechanism of a plastic extruder according to claim 3, characterized in that: The gas delivery pipe (7) and the exhaust pipe (71) are symmetrically arranged; when the gas delivery pump is not started, the side wall of the heat conductive magnetic block (8) abuts against the side wall of the gas delivery pipe (7), and the electromagnet (634) is in a powered-on state; when the gas delivery pump is started, the electromagnet (634) is in a powered-off state.

5. The extrusion mechanism of a plastic extruder according to claim 3, characterized in that: The heat-conducting magnetic block (8) and the magnetic scraper (631) are arranged with different magnetic polarities, and the magnetic force between the heat-conducting magnetic block (8) and the magnetic scraper (631) is greater than the friction force between the magnetic scraper (631) and the cavity (63).

6. The extrusion mechanism of a plastic extruder according to claim 3, characterized in that: The outer ring of the heat-conducting magnetic block (8) is provided with heat-conducting particles, and the inner cavities of the heat-insulating cavity (72) and the connecting cavity (73) are coated with a heat-insulating layer.

7. The extrusion mechanism of a plastic extruder according to claim 2, characterized in that: A solenoid valve (712) is installed on the exhaust pipe (71); a branch pipe (9) is connected through the side wall of the exhaust pipe (71); the inner cavity of the branch pipe (9) is communicated with the middle inner cavity of the feed channel (611); a bracket (91) is fixedly installed inside the branch pipe (9); a support rod (92) is slidably connected inside the bracket (91); a ball plug (922) is fixedly connected to the end of the support rod (92) close to the middle inner cavity of the feed channel (611); a pressure plate (921) is fixedly connected to the end of the support rod (92) away from the ball plug (922); an inclined baffle (711) is fixedly connected to the inner side wall of the exhaust pipe (71) corresponding to the branch pipe (9); and the ball plug (922) is elastically connected to the side wall of the bracket (91) via a thermal spring (93).

8. The extrusion mechanism of a plastic extruder according to claim 7, characterized in that: After the extrusion operation is completed, the air delivery pump is started. The operation of the air delivery pump is divided into two states: stage ventilation and continuous ventilation. During stage ventilation, the solenoid valve (712) is in an open state, and the ball plug (922) completely blocks the port of the branch pipe (9); during continuous ventilation, the solenoid valve (712) is in a closed state, and the port of the branch pipe (9) is in an open state.

9. The extrusion mechanism of a plastic extruder according to claim 7, characterized in that: The trigger discharge assembly comprises a mounting cavity 1 (65), a mounting cavity 2 (66), a discharge trough (67), a rotating wheel (68) and a trigger switch (94). The trigger switch (94) is fixedly connected to the bracket (91) and faces the side of the inclined baffle (711). A motor (651) is mounted in the mounting cavity 1 (65). A bevel gear set (652) is arranged in the mounting cavity 2 (66). The ends of the discharge trough (67) respectively penetrate the middle inner cavity of the feed channel (611), the machine head (61) and the side wall of the machine head fixing cylinder (6). The rotating wheel (68) is rotatably arranged in the discharge trough (67). The bevel gear set (652) is respectively sleeved on the output shaft of the motor (651) and the connecting shaft of the rotating wheel (68). A discharge opening (681) matching the discharge trough (67) is opened through the inside of the rotating wheel (68).

10. The extrusion mechanism of a plastic extruder according to claim 9, characterized in that: The trigger switch (94) is electrically connected to the motor (651). When the motor (651) is started, the rotation angle of the discharge port (681) is (90) degrees, and the discharge trough (67) is connected to the middle inner cavity of the feed channel (611). During the extrusion operation, the motor (651) rotates in the opposite direction, and the rotating wheel (68) re-blocks the discharge trough (67).

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