GMT board intelligent production line: one of the three-mold extrusion machines for production process.

Abstract

This invention discloses a production process for a three-mold extruder, part of an intelligent production line for GMT boards. The extruder comprises a feeder, a plasticizing mechanism, and an extrusion mechanism, along with a return liquid tank, a metering compensation mechanism, and a die end. A heat exchange sleeve is fixedly fitted onto the outer side of the plasticizing mechanism. The end of the heat exchange sleeve is equipped with an oil pipe and a circulation pump connected to the inner cavity of the return liquid tank. The end of the extrusion mechanism is connected to the interior of the die end via the metering compensation mechanism, which is fixedly installed on the surface of the return liquid tank. In this invention, by fitting a heat exchange sleeve onto the outer side of the high-temperature plasticizing structure of the extruder and using oil for temperature conduction, the temperature of the entire injection metering mechanism is uniformly controlled. The heating module inside the return liquid tank and the excess high temperature of the plasticizing structure are used for secondary heating of the plasticizing liquid at the extrusion and metering ends, ensuring the fluidity of the plasticizing liquid, making the metering more accurate, and improving the extrusion molding quality.

Description

Technical Field

[0001] This invention relates to the field of fiberglass mat production technology, specifically to the production process of a three-mold extruder in an intelligent production line for GMT boards. Background Technology

[0002] The intelligent production line for GMT (Glass Fiber Reinforced Thermoplastic Composite) products is mainly used to produce: automotive underbody shielding devices, load-bearing plates, door trim, engine hoods, rear trunk lids, cargo compartment partitions, dashboard assemblies, building templates, packaging products, military parts, sports equipment, and electronic components. Traditional GMT sheets consist of an intermediate layer made of glass fiber needle-punched felt or woven hybrid felt, a surface covering layer made of PP sheets or molten PP resin, and a bottom layer made of non-woven fabric. In this type of GMT sheet, glass fiber felt is impregnated through high-temperature melt extrusion during the support process. There are three main manufacturing processes for GMT materials: wet process, dry process, and fluidized bed process. The wet process requires significant equipment investment and is complex, but produces sheets with good uniformity and high thermal expansion. The dry process and fluidized bed process require simpler equipment and less investment, but produce sheets with poor uniformity and lower thermal expansion, due to the less uniform mixing of glass fiber and PP compared to the wet process.

[0003] Precise metering control is required during GMT board production. Existing metering methods mainly rely on metering pumps, which use extrusion liquid to drive the pump and increase its volume. However, the extrusion process inside the pump consumes kinetic energy and results in significant heat loss through heat conduction, leading to reduced fluidity of the extrusion liquid. This presents certain drawbacks. Therefore, this paper proposes a three-mold extruder process for intelligent GMT board production lines to address the issue of reduced fluidity of the extrusion liquid at the metering end, which affects product quality. The aim is to solve the problem and enhance practical value through this technology. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, the technical solution adopted in this invention is as follows: a three-mold extruder for an intelligent GMT board production line, comprising: an extruder consisting of a feeder, a plasticizing mechanism, and an extrusion mechanism, as well as a return liquid tank, a metering compensation mechanism, and a die end. A heat exchange guide sleeve is fixedly sleeved on the outer side of the plasticizing mechanism. The end of the heat exchange guide sleeve is provided with an oil pipe and a circulating pump connected to the inner cavity of the return liquid tank. The end of the extrusion mechanism is connected to the interior of the die end through the metering compensation mechanism, which is fixedly installed on the surface of the return liquid tank. The interior of the return liquid tank is provided with a heat-conducting base and a dispersion liquid tray. The surface of the heat-conducting base is fixed... The device is equipped with several heat exchange fins, the top surface of which is embedded in the surface of the metering compensation mechanism. Heat pipes are provided inside the heat exchange fins and the heat-conducting base. One side of the heat pipes extends to the bottom of the heat-conducting base. Several resistance heating tiles are fixedly installed on the bottom surface of the heat-conducting base. The metering compensation mechanism includes a metering guide box, a linkage shaft seat, meshing wheels, a counter, and a compensation motor. There are two meshing wheels that are symmetrically meshed and rotated on the surface of the linkage shaft seat. The outer circumference of the meshing wheels slides against the inner wall of the metering guide box. The output end of the compensation motor is fixedly connected to a main drive shaft that is sleeved on the inner side of the meshing wheels.

[0006] In a preferred embodiment, the present invention may be further configured such that: the heat exchange sleeve and the return liquid tank are filled with conductive oil; the heat-conducting chassis, the heat exchange fins and the metering guide box are made of metal; and the surface of the heat pipe is in contact with the inner side of the heat-conducting chassis and the heat exchange fins.

[0007] By adopting the above technical solution, the thermal conductivity of the metal of the heat-conducting chassis, heat exchange fins and metering guide box is used for temperature transfer, and the extrusion liquid flowing inside the metering compensation mechanism is reheated to improve its fluidity.

[0008] In a preferred embodiment, the present invention can be further configured as follows: one end of the oil pipeline is connected to the bottom end of the dispersion plate via a circulation pump; the surface of the dispersion plate is provided with several outlet holes; a circulation pipeline for oil reflux is fixedly connected to the outside of the reheat tank; the other end of the circulation pipeline is connected to the inside of the heat exchange sleeve; and the conductive oil is mineral oil or one of alkylbenzene, diphenyl ether, terphenyl, or polyether.

[0009] By adopting the above technical solution, the external heat energy that was originally unusable during the heating of the plasticizing mechanism is transferred to the metering end through the oil heat energy conduction method, thereby heating the internal flow of liquid in the metering compensation mechanism and improving energy utilization.

[0010] In a preferred embodiment, the present invention can be further configured as follows: the input end of the extruder is electrically connected to a controller, the controller being a PLC controller or a microcontroller, the input end of the controller being electrically connected to the output end of the counter, the compensation motor being a servo motor, the surface of the meshing wheel being provided with a plurality of pressing protrusions and liquid inlet grooves, the pressing protrusions and liquid inlet grooves being distributed adjacently at intervals, and the shapes and sizes of the pressing protrusions and liquid inlet grooves being adapted to each other, and both ends of the linkage shaft seat being provided with rotating shafts, the center-to-center distance of the rotating shafts being equal to the sum of the center-to-center distances of the pressing protrusions and the liquid inlet grooves to the center of the meshing wheel.

[0011] By adopting the above technical solution, a liquid-passing structure is formed by the relative rotation of two meshing wheels. The flow rate is measured by the number of rotations in the liquid-passing process, and the pumping driving force can be spontaneously generated during the active rotation of the meshing wheels to compensate for the kinetic energy of the liquid flow.

[0012] In a preferred embodiment, the present invention can be further configured such that: the surface of the metering guide box is provided with a material passage hole located at the center line of the two meshing wheels, and the inside of the material passage hole is provided with a one-way injection valve to ensure that the extrusion liquid flows smoothly into the mold end for extrusion production.

[0013] The intelligent production line for GMT boards uses a three-mold extruder and includes the following steps:

[0014] S1: The set pressure P1 is the pressure before the main metering pump, pressure P2 is the pressure before the main pump of mold T1, pressure P3 is the pressure before the main pump of mold T2, and pressure P4 is the pressure before the main pump of mold T3. During the start-up process, the opening thickness of molds T1, T2, and T3 should be adjusted according to the product requirements before starting the main pumps before T1, T2, and T3. Finally, start the main pumps and then start the single screw. The value of P1 is the closed-loop value of the single screw. Under the condition of pressure fluctuation, the system automatically adjusts the speed of the single screw according to the closed-loop pressure value to ensure that the actual pressure is the same as the set pressure (P1 setting) and achieves the closed-loop state. This state is the main state and is intended to stabilize the main feed output.

[0015] S2: Set the P1 value at the main control terminal. Calculate the pressure loss of the liquid flow inside each metering pump of molds T1, T2, and T3 based on the differences between P2, P3, and P4 and P1. After ensuring that the opening thickness of molds T1, T2, and T3 is uniform, when one of the pressures of P2, P3, and P4 fluctuates, the speed of the compensation motor of the metering compensation mechanism before T1, T2, and T3 can be actively adjusted according to the site conditions to achieve stable production of the three molds.

[0016] S3: During the heating and melting of the raw material granules in the plasticizing zone, the extruder heating is electric, coordinated with a PLC control program and PID automatic adjustment. The output signal source is automatically adjusted according to the set temperature, including heating and cooling signals. When the set temperature is 120℃, a heating signal is output when the temperature is below 120℃, and the heater starts heating. When the temperature approaches 120℃, the heating device intermittently heats to maintain the temperature at the set value. When the actual detected temperature exceeds 120℃, reaching 105℃, the heating signal source stops, and plasticizing is complete. During the heating process, the surface heating structure of the mechanism heats the oil inside the heat exchange sleeve. Through the circulation and conduction of the oil, the oil inside the return liquid tank is heated as a whole. The heat-conducting chassis and heat pipes are used to keep the temperature of the plasticized liquid inside the metering compensation mechanism and the reverse secondary return temperature constant from the extruder to the mold end. When the temperature of the oil inside the return liquid tank is lower than the melting temperature inside the plasticized structure, the oil is heated by electric heating of the resistance heating tile. The internal temperature of the metering compensation mechanism before T1, T2, and T3 is actively adjusted according to the site conditions to achieve the goal of stable production of the three molds.

[0017] The beneficial effects achieved by this invention are as follows:

[0018] 1. In this invention, by attaching a heat exchange sleeve to the outside of the high-temperature plasticizing structure of the extruder and conducting temperature through oil, the temperature of the entire injection metering mechanism is uniformly controlled. The heating module inside the return liquid tank and the excess high temperature of the plasticizing structure are used for secondary heating of the plasticizing liquid at the extrusion end and the metering end, ensuring the fluidity of the plasticizing liquid, making the metering more accurate and improving the extrusion molding quality.

[0019] 2. In this invention, the high temperature of the outer wall of the heating structure of the plasticizing zone is absorbed and utilized by the connection between the heat exchange sleeve and the oil pipeline inside the return liquid tank through the integral liquid flow temperature conduction structure. The plasticizing liquid at the metering end is heated by the oil temperature conduction, thereby improving the energy utilization rate. This can maintain the fluidity of the liquid flow at the metering end and reduce the energy consumption of secondary heating.

[0020] 3. In this invention, by adopting a metering compensation mechanism structure, the pressure flow of the plasticized liquid actively drives the meshing wheel to rotate, and the number of rotations of the meshing wheel is recorded to accurately measure the amount of liquid entering each mold end. Under the active drive of the compensation motor, the kinetic energy compensation for the liquid flow is provided to make up for the loss of liquid flow force at the metering end, so that the metering speed tends to be constant, thereby further improving the metering accuracy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention;

[0022] Figure 2This is a schematic diagram of the structure of the rewarming liquid tank and the metering compensation mechanism according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of the rewarming liquid tank according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of a heat pipe mounting structure according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the internal structure of the metering guide box according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the meshing wheel mounting structure according to an embodiment of the present invention.

[0027] Figure label:

[0028] 100. Extruder; 110. Heat exchanger sleeve;

[0029] 200. Warm-up liquid tank; 210. Heat-conducting base; 220. Dispersion liquid tray; 230. Resistance heating tile; 240. Heat pipe; 211. Heat exchange fin tray;

[0030] 300. Metering compensation mechanism; 310. Metering guide box; 320. Linkage shaft seat; 330. Meshing wheel; 340. Main drive shaft; 350. Counter; 360. Compensation motor; 331. Pressing convex tooth; 332. Liquid inlet groove;

[0031] 400. Mold end. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0033] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0034] The production process of a three-mold extruder, one of the intelligent production lines for GMT boards provided by the present invention, is described below with reference to the accompanying drawings.

[0035] Combination Figure 1-6As shown, the intelligent production line for GMT boards provided by this invention includes a three-mold extruder manufacturing process, comprising: an extruder 100 consisting of a feeder, a plasticizing mechanism, and an extrusion mechanism; a return liquid tank 200; a metering compensation mechanism 300; and a die end 400. A heat exchange guide sleeve 110 is fixedly sleeved on the outer side of the plasticizing mechanism. The end of the heat exchange guide sleeve 110 is provided with an oil pipe and a circulating pump connected to the inner cavity of the return liquid tank 200. The end of the extrusion mechanism is connected to the interior of the die end 400 through the metering compensation mechanism 300. The metering compensation mechanism 300 is fixedly installed on the surface of the return liquid tank 200. The interior of the return liquid tank 200 is provided with a heat-conducting base 210 and a dispersion liquid tray 220. A plurality of heat exchange fins 21 are fixedly installed on the surface of the heat-conducting base 210. 1. The top surface of the heat exchange fin 211 is embedded in the surface of the metering compensation mechanism 300. The heat exchange fin 211 and the heat conduction base 210 are provided with heat pipes 240. One side of the heat pipes 240 extends to the bottom of the heat conduction base 210. Several resistance heating tiles 230 are fixedly installed on the bottom surface of the heat conduction base 210. The metering compensation mechanism 300 includes a metering guide box 310, a linkage shaft seat 320, a meshing wheel 330, a counter 350 and a compensation motor 360. There are two meshing wheels 330, which are symmetrically meshed and rotated on the surface of the linkage shaft seat 320. The outer periphery of the meshing wheel 330 slides against the inner wall of the metering guide box 310. The output end of the compensation motor 360 is fixedly connected to a main drive shaft 340 sleeved on the inner side of the meshing wheel 330.

[0036] In this embodiment, the heat exchange sleeve 110 and the return liquid tank 200 are filled with conductive oil. The heat-conducting chassis 210, the heat exchange fins 211 and the metering box 310 are made of metal. The surface of the heat pipe 240 is in contact with the inner side of the heat-conducting chassis 210 and the heat exchange fins 211.

[0037] Specifically, the thermal conductivity of the metal of the heat-conducting chassis 210, heat exchange fins 211, and metering guide box 310 is used to transfer temperature and to reheat the extruded liquid flowing inside the metering compensation mechanism 300 to improve its fluidity.

[0038] In this embodiment, one end of the oil pipeline is connected to the bottom end of the dispersion plate 220 via a circulation pump. The surface of the dispersion plate 220 is provided with several outlet holes. A circulation pipeline for oil return is fixedly connected to the outside of the return liquid tank 200. The other end of the circulation pipeline is connected to the inside of the heat exchange sleeve 110. The conduction oil is mineral oil or one of alkylbenzene, diphenyl ether, terphenyl, or polyether.

[0039] Specifically, the external heat energy that was originally unusable during the heating of the plasticizing mechanism is transferred to the metering end by means of oil heat conduction, which heats the internal flow of liquid in the metering compensation mechanism 300. During the heating process, the surface heating structure of the plasticizing mechanism heats the oil inside the heat exchange sleeve 110. Through the circulation of the oil, the oil inside the return liquid tank 200 is heated as a whole. The heat conduction chassis 210 and heat pipe 240 are used to maintain the plasticizing liquid inside the metering compensation mechanism 300 and the reverse secondary return temperature, thereby improving the energy utilization rate.

[0040] In this embodiment, the input end of the extruder 100 is electrically connected to a controller, which is a PLC controller or a microcontroller. The input end of the controller is electrically connected to the output end of the counter 350. The compensation motor 360 is a servo motor. The surface of the meshing wheel 330 is provided with a plurality of pressing protrusions 331 and liquid inlet grooves 332. The pressing protrusions 331 and liquid inlet grooves 332 are distributed adjacently at intervals, and the shapes and sizes of the pressing protrusions 331 and liquid inlet grooves 332 are adapted to each other. Both ends of the linkage shaft seat 320 are provided with rotating shafts. The distance between the centers of the rotating shafts is equal to the sum of the distances between the pressing protrusions 331 and the liquid inlet grooves 332 and the center of the meshing wheel 330.

[0041] Specifically, the liquid flow structure is formed by the relative rotation of two meshing wheels 330. The flow rate is measured by the number of rotations in the liquid flow. The active rotation of the meshing wheels 330 can spontaneously generate pumping driving force to compensate for the kinetic energy of the liquid flow, so as to achieve the purpose of stable production of three molds.

[0042] In this embodiment, the surface of the metering guide box 310 is provided with a material passage hole located at the center line of the two meshing wheels 330, and the inside of the material passage hole is provided with a one-way injection valve to ensure that the extrusion liquid flows smoothly into the mold end 400 for extrusion production.

[0043] The intelligent production line for GMT boards uses a three-mold extruder and includes the following steps:

[0044] S1: The set pressure P1 is the pressure before the main metering pump, pressure P2 is the pressure before the main pump of mold T1, pressure P3 is the pressure before the main pump of mold T2, and pressure P4 is the pressure before the main pump of mold T3. During the start-up process, the opening thickness of molds T1, T2, and T3 should be adjusted according to the product requirements before starting the main pumps before T1, T2, and T3. Finally, start the main pumps and then start the single screw. The value of P1 is the closed-loop value of the single screw. Under the condition of pressure fluctuation, the system automatically adjusts the speed of the single screw according to the closed-loop pressure value to ensure that the actual pressure is the same as the set pressure P1, thus achieving the closed-loop state. This state is the main state and is intended to stabilize the main feed output.

[0045] S2: Set the P1 value at the main control terminal. Calculate the pressure loss of the main metering pump and the internal liquid flow pressure loss of each metering pump in molds T1, T2, and T3 based on the differences between P2, P3, and P4 and P1. After ensuring that the opening thickness of molds T1, T2, and T3 is uniform, when one of the pressures P2, P3, or P4 fluctuates, the compensation motor 360 of the metering compensation mechanism 300 before T1, T2, and T3 can be actively adjusted according to the site conditions to achieve stable production of the three molds.

[0046] S3: During the process of heating and melting the raw material granules in the plasticizing zone using the surface heating structure, the extruder heating is electric, coordinated with PLC control program PID automatic adjustment; the output signal source is automatically adjusted according to the set temperature, including heating and cooling signals. When the set value is 120℃, if the temperature is below 120℃, the heating signal source is output, and the heater starts heating. When the temperature approaches 120℃, the heating device intermittently heats to maintain the temperature at the set value. When the actual detected temperature exceeds 120℃, reaching 105℃, the heating signal source stops. The surface heating structure of the plasticizing mechanism, during the heating process... The oil inside the heat exchange sleeve 110 is heated, and the oil is heated as a whole in the return liquid tank 200 through the circulation of the oil. The heat conduction chassis 210 and heat pipe 240 are used to keep the temperature of the plasticized liquid inside the metering compensation mechanism 300 and the reverse secondary return liquid constant from the extruder 100 to the mold end 400. When the temperature of the oil inside the return liquid tank 200 is lower than the melting temperature inside the plasticized structure, the oil is heated by electric heating of the resistance heating tile 230. The internal temperature of the metering compensation mechanism 300 before T1, T2 and T3 is actively adjusted according to the site conditions to achieve the purpose of stable production of the three molds.

[0047] In this invention, the term "a plurality of" refers to two or more unless otherwise expressly defined. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. The terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection via an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] It should be noted that when a component is referred to as being "assembled on," "mounted on," "fixed to," or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0049] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. GMT sheet intelligent production line one-machine three-mold extruder, characterized in that, include: An extruder (100) consisting of a feeder, a plasticizing mechanism, and an extrusion mechanism, as well as a warm liquid tank (200), a metering compensation mechanism (300), and a mold end (400), wherein a heat exchange guide sleeve (110) is fixedly sleeved on the outside of the plasticizing mechanism, and the end of the heat exchange guide sleeve (110) is provided with an oil pipe and a circulation pump that are connected to the inner cavity of the warm liquid tank (200). The end of the extrusion mechanism is connected to the inside of the mold end (400) through the metering compensation mechanism (300), and the metering compensation mechanism (300) is fixedly installed on the surface of the warm liquid tank (200). The interior of the reheat liquid tank (200) is provided with a heat-conducting base (210) and a dispersion liquid tray (220). Several heat exchange fins (211) are fixedly installed on the surface of the heat-conducting base (210). The top surface of the heat exchange fins (211) is embedded in the surface of the metering compensation mechanism (300). Heat pipes (240) are provided inside the heat exchange fins (211) and the heat-conducting base (210). One side of the heat pipes (240) extends to the bottom of the heat-conducting base (210). Several resistance heating tiles (230) are fixedly installed on the bottom surface of the heat-conducting base (210). The metering compensation mechanism (300) includes a metering guide box (310), a linkage shaft seat (320), a meshing wheel (330), a counter (350), and a compensation motor (360). There are two meshing wheels (330) that are symmetrically meshed and rotated on the surface of the linkage shaft seat (320). The outer periphery of the meshing wheel (330) slides against the inner wall of the metering guide box (310). The output end of the compensation motor (360) is fixedly connected to a main drive shaft (340) that is sleeved on the inner side of the meshing wheel (330).

2. A GMT sheet intelligent production line one-machine three-mold extruder according to claim 1, characterized in that, The heat exchange sleeve (110) and the return liquid tank (200) are filled with conductive oil. The heat-conducting chassis (210), the heat exchange fins (211) and the metering box (310) are made of metal. The surface of the heat pipe (240) is in contact with the inner side of the heat-conducting chassis (210) and the heat exchange fins (211).

3. The GMT sheet intelligent production line one-machine three-mold extruder of claim 2, wherein, One end of the oil pipeline is connected to the bottom end of the dispersion plate (220) via a circulation pump. The surface of the dispersion plate (220) is provided with several outlet holes. A circulation pipeline for oil return is fixedly connected to the outside of the return liquid tank (200). The other end of the circulation pipeline is connected to the inside of the heat exchange guide sleeve (110). The conduction oil is mineral oil or one of alkylbenzene, diphenyl ether, terphenyl, or polyether.

4. The three-mold extruder, one component of the intelligent GMT board production line according to claim 1, is characterized in that... The surface of the meshing wheel (330) is provided with a plurality of pressing protrusions (331) and liquid inlet grooves (332). The pressing protrusions (331) and liquid inlet grooves (332) are distributed adjacently at intervals, and the shape and size of the pressing protrusions (331) and liquid inlet grooves (332) are adapted to each other. Both ends of the linkage shaft seat (320) are provided with rotating shafts. The center-to-center distance of the rotating shafts is equal to the sum of the center-to-center distances of the pressing protrusions (331) and liquid inlet grooves (332) to the meshing wheel (330).

5. The three-mold extruder, one component of the intelligent GMT board production line according to claim 1, is characterized in that... The input terminal of the extruder (100) is electrically connected to a controller, which is a PLC controller or a single-chip microcomputer structure. The input terminal of the controller is electrically connected to the output terminal of the counter (350). The compensation motor (360) is a servo motor structure.

6. The three-mold extruder, one component of the intelligent GMT board production line according to claim 1, is characterized in that... The surface of the metering guide box (310) is provided with a material passage hole located at the center line of the two meshing wheels (330), and the inside of the material passage hole is provided with a one-way injection valve.

7. A three-mold extruder production process for an intelligent GMT board production line, using the three-mold extruder as described in any one of claims 1-6, characterized in that... Includes the following steps: S1: The set pressure P1 is the pressure before the main metering pump, pressure P2 is the pressure before the main pump of mold T1, pressure P3 is the pressure before the main pump of mold T2, and pressure P4 is the pressure before the main pump of mold T3. During the start-up process, the opening thickness of molds T1, T2, and T3 should be adjusted according to the product requirements before starting the main pumps before T1, T2, and T3. Finally, start the main pumps and then start the single screw. The value of P1 is the closed-loop value of the single screw. Under pressure fluctuation, the system automatically adjusts the speed of the single screw according to the closed-loop pressure value to ensure that the actual pressure is the same as the set pressure P1, thus achieving a closed-loop state. This state is the main state and is intended to stabilize the main feed output. S2: Set the value of P1 at the main control terminal. Calculate the pressure loss of the main metering pump and the internal liquid flow pressure loss of each metering pump in molds T1, T2, and T3 based on the difference between P2, P3, and P4 and P1. After ensuring that the opening thickness of molds T1, T2, and T3 is uniform, when one of the pressures of P2, P3, and P4 fluctuates, the speed of the compensation motor (360) of the metering compensation mechanism (300) in front of T1, T2, and T3 can be actively adjusted according to the site conditions to achieve the purpose of stable production of the three molds. S3: During the process of heating and melting the raw material granules in the plasticizing zone, the surface heating structure heats the oil inside the heat exchange sleeve (110) during the heating process. The oil is circulated and conducted to heat the oil inside the return liquid tank (200) as a whole. The heat conduction chassis (210) and heat pipe (240) are used to keep the temperature of the plasticized liquid inside the metering compensation mechanism (300) and the reverse secondary return temperature constant from the extruder (100) to the mold end (400). When the temperature of the oil inside the return liquid tank (200) is lower than the melting temperature inside the plasticizing structure, the electric heating of the resistance heating tile (230) is used to heat the oil. The internal temperature of the metering compensation mechanism (300) before T1, T2, and T3 is actively adjusted according to the on-site conditions to achieve the purpose of stable production of the three molds.

8. The production process of the three-mold extruder in the intelligent GMT board production line according to claim 7, characterized in that, The extruder heating uses electric heating, combined with PLC control program PID automatic adjustment; the output signal source is automatically adjusted according to the set temperature, including heating signal and cooling signal. When the set value is 120℃, when it is below 120℃, the heating signal source is output and the heater starts heating. When the temperature approaches 120℃, the heating device intermittently heats to maintain the temperature at the set value. When the actual detected temperature value exceeds 120℃, reaching 105℃, the heating signal source stops.

Images