A wood-plastic composite extrusion molding process control device

Abstract

This invention relates to the field of wood-plastic extrusion technology, specifically to a wood-plastic composite extrusion molding process control device, comprising a processing shell. Current is transmitted to the induction shell via a conductive rod, conductive ring, moving ring, resistance wire, and conductive wire. At this time, the moving ring is at the lowest end of the resistance wire, with the resistance value at its minimum and the current at its maximum. The magnetic powder chain inside the induction shell is firmly secured due to strong magnetization, efficiently transmitting the motor power to the central shaft. Then, the screw is driven to rotate through the first transmission belt and the first I-beam wheel, realizing the mixing and extrusion of the wood-plastic mixture. When the temperature inside the processing shell continues to rise, the heat-conducting plate senses the temperature and transmits it to the reaction shell through the heat-conducting rod. At this time, the path of the current flowing through the resistance wire increases, the resistance increases, and the current decreases. The magnetic powder chain becomes loose due to weakened magnetization, resulting in a decrease in transmitted power and a reduction in screw speed. By reducing the screw pitch and mixing friction through deceleration, heat generation is suppressed from the source, preventing the wood fibers from being charred and carbonized due to high temperature.

Description

Technical Field

[0001] This invention relates to the field of wood-plastic extrusion technology, specifically to a wood-plastic composite extrusion molding process control device. Background Technology

[0002] Wood-plastic composites have been widely used in building materials, landscaping, and packaging due to their advantages such as environmental protection, weather resistance, and recyclability. Extrusion molding is the mainstream process for producing wood-plastic profiles. In the wood-plastic extrusion production process, temperature, screw speed, and exhaust efficiency are the three core process parameters that determine product quality, output, and production stability.

[0003] However, the three parameters of temperature, speed and exhaust are independent of each other and lack a coordinated control mechanism. When the temperature inside the extrusion unit becomes too high due to factors such as shear heat, the operator needs to rely on experience to manually reduce the screw speed, start the cooling device and increase the exhaust volume to prevent the wood powder from burning. This method of relying on manual intervention is slow to react and cannot achieve instantaneous coordinated adjustment of multiple parameters when the temperature rises sharply. It is very easy to cause thermal degradation or even carbonization of wood fiber, which seriously affects product quality and production continuity. Summary of the Invention

[0004] The purpose of this invention is to provide a wood-plastic composite extrusion molding process control device to solve the problem mentioned in the background art where multiple components cannot react quickly when the internal temperature of the extrusion device rises, resulting in wood fibers being easily charred and carbonized by heat.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A wood-plastic composite extrusion molding process control device includes a processing shell. A screw is rotatably connected to one inner wall of the processing shell, and a motor and an induction shell are installed at the lower end of the processing shell. A central rotating shaft is rotatably connected to one inner wall of the induction shell. A transmission plate is fixedly connected to the output end of the motor and one end of the central rotating shaft. A rotating shaft is provided at one end of the screw. First I-beam wheels are fixedly connected to the circumferential surfaces of the rotating shaft and the central rotating shaft. A first transmission belt is drivingly connected to the circumferential surfaces of the two first I-beam wheels. A thermally sensing variable resistance mechanism is provided on the lower side of the processing shell. The thermally sensing variable resistance mechanism is connected to the processing shell and the transmission plate. It is used to sense the temperature inside the processing shell and change the resistance and reduce the speed of the screw when the temperature rises.

[0006] Furthermore, the thermally inductive variable resistance mechanism comprises a heat-conducting plate, a reaction shell, a heat-conducting block, a moving block, and a variable resistance assembly. The reaction shell is fixedly connected to the lower end of the processing shell. The heat-conducting plate is fixedly connected to the inner circumference of the processing shell, and a heat-conducting rod is provided at one end of the heat-conducting plate. The heat-conducting rod extends into the reaction shell. The heat-conducting block is fixedly connected to the lower end of the heat-conducting rod. The moving block is slidably connected inside the reaction shell. The variable resistance assembly is located on the lower side of the reaction shell and is connected to the moving block. It is used to increase the resistance value when the moving block rises, thereby changing the current and thus reducing the screw speed.

[0007] Furthermore, the variable resistance assembly comprises an insulating shell, a conductive wire, a resistance rod, a moving ring, a conductive rod, and a conductive ring. The insulating shell is fixedly connected to the lower end of the reaction shell, the resistance rod is fixedly connected to the lower end of the reaction shell, the moving ring is slidably connected to the circumferential surface of the resistance rod, the conductive ring is fixedly connected to the circumferential surface of the moving ring, the conductive rod is fixedly connected to the lower end of the moving block, the conductive ring is slidably connected to the circumferential surface of the conductive rod, the conductive wire is fixedly connected to the lower end of the resistance rod and the circumferential surface of the inductive shell, and the conductive rod is electrically connected to an external current.

[0008] Furthermore, it also includes an exhaust mechanism, which comprises a drive groove, a sliding block, a first piston shell, a first piston rod, a first piston plate, a transmission pipe, a second piston shell, a second piston plate, a second piston rod, a spring, an exhaust port, a sealing plate, and a receiving groove. The drive groove is formed on the circumferential surface of the reaction shell, the sliding block is fixedly connected to the circumferential surface of the moving block, and the sliding block is slidably connected within the drive groove. The first piston shell is fixedly connected to the lower end of the processing shell, the first piston plate is slidably connected within the first piston shell, and the first piston rod is fixedly connected to the first piston plate. The lower end of the piston plate and the upper end of the first piston rod are fixedly connected. The exhaust port is opened at the upper end of the processing shell. The receiving groove is opened on the inner wall of one side of the exhaust port. The second piston shell is fixedly connected to one end of the processing shell. The transmission pipe is fixedly connected to the circumferential surface of the first piston shell and the circumferential surface of the second piston shell. The second piston plate is slidably connected inside the second piston shell. The second piston rod is slidably connected to the second piston shell and the receiving groove. The sealing plate is fixedly connected to one end of the second piston rod. The spring is sleeved on the circumferential surface of the second piston rod.

[0009] Furthermore, it also includes a heat dissipation mechanism, which comprises an insulation shell, multiple heat dissipation fins, a cooling fan, two bevel gears, a driven shaft, two clutch friction plates, a follower block, a telescopic rod, a follower groove, a follower block, a pull rod, and a transmission assembly. The clutch shell is located on the lower side of the machining shell, the telescopic rod is rotatably connected to the lower inner wall of the clutch shell, multiple heat dissipation fins are fixedly connected to the lower end of the machining shell, the insulation shell is fixedly connected to the lower end of the machining shell, the cooling fan is located at one end of the insulation shell, and the driven shaft... The shaft is rotatably connected to the upper inner wall of the clutch housing. The two bevel gears are respectively fixedly connected to the circumferential surfaces of the driven shaft and the cooling fan output shaft. The clutch friction plates are respectively fixedly connected to the adjacent ends of the driven shaft and the telescopic rod. The follower groove is opened on the circumferential surface of the clutch housing. The follower block is rotatably connected to the circumferential surface of the telescopic rod through a bearing. The pull rod is respectively fixedly connected to the adjacent ends of the follower block and the sliding block. The transmission assembly is located on the lower side of the machining housing and is used to transmit the power of the motor output shaft to the telescopic rod.

[0010] Furthermore, the transmission assembly comprises a rotating shaft, a worm groove, a worm wheel, two second I-beams, a second transmission belt, and a transmission shaft. The transmission shaft is rotatably connected to the lower end of the telescopic rod, and the rotating shaft is rotatably connected to the lower end of the processing housing. The worm wheel is fixedly connected to the circumferential surface of the rotating shaft. The worm groove is formed on the circumferential surface of the motor's output shaft. The two second I-beams are respectively fixedly connected to the circumferential surfaces of the rotating shaft and the transmission shaft. The second transmission belt is drivingly connected to the circumferential surfaces of the two second I-beams.

[0011] Furthermore, the lower end of the processing shell is fixedly connected to the mounting shell, and one end of the processing shell is fixedly connected to the placement shell. The rotating shaft and the transmission shaft are both rotatably connected to the lower inner wall of the mounting shell.

[0012] Furthermore, an infeed tube is fixedly connected to the upper end of the processing shell, and an extrusion tube is fixedly connected to one end of the processing shell.

[0013] The technical solution provided by this invention has the following advantages compared with the known prior art: 1. When wood fiber and plastic are simultaneously added to the processing shell, the current is transmitted to the induction shell via the conductive rod, conductive ring, moving ring, resistance wire, and conductive wire. At this time, the moving ring is at the lowest end of the resistance wire, with the minimum resistance and maximum current. The magnetic powder chain inside the induction shell is firmly magnetized, efficiently transmitting the motor power to the central shaft. The screw is then driven to rotate via the first transmission belt and the first I-beam wheel, achieving the mixing and extrusion of the wood-plastic mixture. As the temperature inside the processing shell continues to rise, the heat-conducting plate senses the temperature and transmits it to the reaction shell via the heat-conducting rod. The heat-shrinkable material shrinks rapidly upon heating, pulling the moving block upwards and causing the conductive rod, conductive ring, and moving ring to move upwards synchronously. At this time, the path of the current through the resistance wire increases, the resistance increases, and the current decreases. The magnetic powder chain loosens due to weakened magnetization, resulting in a decrease in transmitted power and a reduction in screw speed. By reducing the screw pitch and mixing friction through deceleration, heat generation is suppressed at the source, preventing the wood fiber from charring and carbonizing due to high temperatures.

[0014] 2. When the motor output shaft rotates, power is transmitted to the rotating shaft through the meshing of the worm groove and worm wheel. Then, through the transmission of the second transmission belt and two second I-beam pulleys, power is transmitted to the transmission shaft. At this time, the telescopic rod also rotates with the transmission shaft. On the other hand, multiple heat dissipation fins can sense and concentrate the heat of the processing shell. When the temperature of the processing shell rises sharply, the sliding block will rise with the moving block. Then, through the pulling rod, the telescopic end of the telescopic rod will move upward, so that the two clutch friction plates will contact, transmitting the rotational power of the telescopic rod to the driven shaft. Then, through the meshing transmission of the two bevel gears, the rotational power is transmitted to the cooling fan. The air force generated by the rotation of the cooling fan can cool the multiple cooling fans, thereby reducing the heat of the processing shell and further reducing the temperature of the processing shell and its interior, preventing the wood fiber from scorching and carbonizing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a first front perspective view of the present invention; Figure 2 This is a first main sectional perspective view of the present invention; Figure 3 For the present invention Figure 2 A magnified view of a section at point A in the middle; Figure 4 For the present invention Figure 2 A magnified view of a section at point B in the middle; Figure 5 This is a second front perspective view of the present invention; Figure 6 This is a second main sectional perspective view of the present invention; Figure 7 For the present invention Figure 6 A magnified view of a section at point C.

[0017] In the diagram: 1. Processing shell; 101. Addition pipe; 102. Extrusion pipe; 103. Mounting shell; 104. Placement shell; 105. Screw; 2. Motor; 201. Induction shell; 202. Transmission plate; 203. Central shaft; 204. First transmission belt; 205. Conductive ring; 206. Conductive wire; 207. Insulating shell; 208. Resistance wire rod; 209. Moving ring; 210. Conductive rod; 3. Reaction shell; 301. Heat-conducting plate; 302. Heat-conducting block; 303. Moving block; 4. Sliding block; 401. First piston shell; 402. First piston rod; 403. First piston plate; 404. Transmission pipe; 405. Second piston housing; 406. Second piston plate; 407. Second piston rod; 408. Spring; 409. Exhaust port; 410. Sealing plate; 411. Storage groove; 5. Worm groove; 501. Worm wheel; 502. Rotating shaft; 503. Second transmission belt; 504. Second I-beam pulley; 505. Clutch housing; 506. Pull rod; 507. Follower block; 508. Follower groove; 509. Insulation shell; 510. Heat dissipation fins; 511. Bevel gear; 512. Cooling fan; 513. Driven shaft; 514. Telescopic rod; 515. Clutch friction plate. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The present invention will be further described below with reference to embodiments.

[0020] Example: A wood-plastic composite extrusion molding process control device, such as Figures 1-7As shown, the device includes a processing shell 1. A screw 105 is rotatably connected to one inner wall of the processing shell 1. A motor 2 and an induction shell 201 are installed at the lower end of the processing shell 1. A central shaft 203 is rotatably connected to one inner wall of the induction shell 201. A transmission plate 202 is fixedly connected to the output end of the motor 2 and one end of the central shaft 203. A rotating shaft is provided at one end of the screw 105. First I-beam wheels are fixedly connected to the circumferential surfaces of the rotating shaft and the central shaft 203. A first transmission belt 204 is drivenly connected to the circumferential surfaces of the two first I-beam wheels. A thermal induction resistance mechanism is provided on the lower side of the processing shell 1. The thermal induction resistance mechanism is connected to the processing shell 1 and the transmission plate 202. It is used to sense the temperature inside the processing shell 1 and change the resistance and reduce the rotation speed of the screw 105 when the temperature rises. The thermally sensing variable resistance mechanism consists of a heat-conducting plate 301, a reaction shell 3, a heat-conducting block 302, a moving block 303, and a variable resistance assembly. The reaction shell 3 is fixedly connected to the lower end of the processing shell 1. The heat-conducting plate 301 is fixedly connected to the inner circumference of the processing shell 1, and a heat-conducting rod is provided at one end of the heat-conducting plate 301. The heat-conducting rod extends into the reaction shell 3. The heat-conducting block 302 is fixedly connected to the lower end of the heat-conducting rod. The moving block 303 is slidably connected to the reaction shell 3. The variable resistance assembly is located on the lower side of the reaction shell 3 and is connected to the moving block 303. It is used to increase the resistance value when the moving block 303 rises, thereby changing the current and thus reducing the rotational speed of the screw 105. The variable resistor assembly consists of an insulating shell 207, a conductive wire 206, a resistance rod 208, a moving ring 209, a conductive rod 210, and a conductive ring 205. The insulating shell 207 is fixedly connected to the lower end of the reaction shell 3. The resistance rod 208 is fixedly connected to the lower end of the reaction shell 3. The moving ring 209 is slidably connected to the circumferential surface of the resistance rod 208. The conductive ring 205 is fixedly connected to the circumferential surface of the moving ring 209. The conductive rod 210 is fixedly connected to the lower end of the moving block 303. The conductive ring 205 is slidably connected to the circumferential surface of the conductive rod 210. The conductive wire 206 is fixedly connected to the lower end of the resistance rod 208 and the circumferential surface of the inductive shell 201. The conductive rod 210 is electrically connected to an external current.

[0021] In a specific embodiment of the present invention, when it is necessary to mix plastic and wood fiber, the wood fiber and plastic can be added into the processing shell 1 at the same time. At this time, the current is transmitted to the inductive shell 201 through the conductive rod 210, conductive ring 205, moving ring 209, resistance wire 208 and conductive wire 206. Since the moving ring 209 is at the lowest end of the resistance wire 208, the resistance it receives when the current passes through is low, so the transmitted current is large. Therefore, the current value in the inductive shell 201 is also large, and the magnetization reaction of the magnetic powder inside is also large. The magnetic powder chain formed is also stronger. Through the "strong magnetic powder chain", the power output by the motor 2 can be transmitted to the central shaft 203 more completely. Then, through the cooperation of the first transmission belt 204 and the two first I-beams, the power can be transmitted to the screw 105, so that the screw 105 rotates to mix the wood-plastic mixture while transmitting and extruding it to the other end. If the temperature inside the processing shell 1 continues to rise, on the one hand, after sensing the temperature, the heat-conducting plate 301 transfers the temperature to the heat-conducting plate 301 and the reaction shell 3 through the heat-conducting rod. At this time, the heat-shrinkable material inside the reaction shell 3 quickly contracts after sensing the temperature and pulls the moving block 303 upward. At this time, the moving block 303 drives the conductive rod 210, the conductive ring 205 and the moving ring 209 to move upward. If the current passes through the resistance wire 208 again, the current will decrease due to the increased resistance value from the resistance wire 208. As a result, the magnetization degree of the magnetic powder in the "strong magnetic powder chain" is insufficient due to the decrease in current, and the magnetic powder chain will be relatively loose. Therefore, the transmitted power will also decrease, which will reduce the rotation speed of the screw 105. By reducing the rotation speed of the screw 105, the pitch generated by the screw 105 is reduced, thereby reducing the degree of mixing friction between wood fiber and plastic, thereby reducing the generated heat, and finally achieving the purpose of lowering the temperature, preventing the wood fiber inside the processing shell 1 from scorching and carbonizing due to temperature.

[0022] Please refer to the details. Figure 1-7It also includes an exhaust mechanism, which consists of a drive groove, a sliding block 4, a first piston shell 401, a first piston rod 402, a first piston plate 403, a transmission pipe 404, a second piston shell 405, a second piston plate 406, a second piston rod 407, a spring 408, an exhaust port 409, a sealing plate 410, and a receiving groove 411. The drive groove is formed on the circumferential surface of the reaction shell 3. The sliding block 4 is fixedly connected to the circumferential surface of the moving block 303 and is slidably connected in the drive groove. The first piston shell 401 is fixedly connected to the lower end of the processing shell 1. The first piston plate 403 is slidably connected in the first piston shell 401. The first piston rod 402 is fixedly connected to the lower end of the first piston plate 403 and is fixedly connected to the upper end of the sliding block 4. The exhaust port 409 is formed on the processing groove. At the upper end of shell 1, a receiving groove 411 is opened on the inner wall of one side of the exhaust port 409. The second piston shell 405 is fixedly connected to one end of the processing shell 1. The transmission pipe 404 is fixedly connected to the circumferential surface of the first piston shell 401 and the circumferential surface of the second piston shell 405. The second piston plate 406 is slidably connected inside the second piston shell 405. The second piston rod 407 is slidably connected inside the second piston shell 405 and the receiving groove 411. The sealing plate 410 is fixedly connected to one end of the second piston rod 407. The spring 408 is sleeved on the circumferential surface of the second piston rod 407. It should be noted that the thermal driving medium in the reaction shell 3 and the hydraulic medium in the first piston shell 401 are independent of each other. The two are linked by a mechanical transmission mechanism composed of the sliding block 4 and the first piston rod 402. There is no medium contact and they do not affect each other.

[0023] Preferably, the reaction shell 3 is filled with a shape memory polymer as a temperature driving medium. This material has the property of rapidly shrinking above a specific glass transition temperature and restoring its shape when the temperature drops. The shape memory polymer can be an epoxy resin-based shape memory material or a thermoplastic polyurethane. Its shrinkage rate and response speed need to meet the requirement that sufficient displacement can be generated to drive the moving block 303 to move before the temperature inside the processing shell 1 exceeds the wood fiber carbonization threshold.

[0024] In this embodiment: while the moving block 303 is pulled upward by the heat-shrinkable material, it will also pull the sliding block 4, the first piston rod 402, and the first piston plate 403 upward by driving the groove. This causes the first piston plate 403 to squeeze out the liquid in the first piston shell 401. The squeezed liquid will be transferred to the second piston shell 405 through the transmission pipe 404, and push the second piston plate 406 to the right. When the second piston plate 406 moves, it will simultaneously pull the second piston rod 407 and the sealing plate 410 to move, gradually exposing the part of the exhaust port 409 that was blocked. This allows the hot steam in the processing shell 1 to dissipate heat more comprehensively and quickly, preventing the accumulation of hot steam and the resulting heat buildup. This further prevents the temperature from rising. The elasticity of the spring 408 makes it easy to reset the second piston plate 406 to the initial position for convenient subsequent use.

[0025] Please refer to the details. Figure 1-7 It also includes a heat dissipation mechanism, which consists of an insulation shell 509, multiple heat dissipation fins 510, a cooling fan 512, two bevel gears 511, a driven shaft 513, two clutch friction plates 515, a follower block 507, a telescopic rod 514, a follower groove 508, a follower block 507, a pull rod 506, and a transmission assembly. The clutch shell 505 is located on the lower side of the processing shell 1. The telescopic rod 514 is rotatably connected to the lower inner wall of the clutch shell 505. The multiple heat dissipation fins 510 are all fixedly connected to the lower end of the processing shell 1. The insulation shell 509 is fixedly connected to the lower end of the processing shell 1. The cooling fan 512 is located at one end of the insulation shell 509. Driven shaft 513 is rotatably connected to the upper inner wall of clutch housing 505. Two bevel gears 511 are fixedly connected to the circumferential surfaces of driven shaft 513 and cooling fan 512 output shaft, respectively. Clutch friction plates 515 are fixedly connected to the near ends of driven shaft 513 and telescopic rod 514, respectively. Follower groove 508 is opened on the circumferential surface of clutch housing 505. Follower block 507 is rotatably connected to the circumferential surface of telescopic rod 514 through bearing. Pull rod 506 is fixedly connected to the near ends of follower block 507 and sliding block 4, respectively. Transmission assembly is set on the lower side of machining housing 1, which is used to transmit the power of motor 2 output shaft to telescopic rod 514. The transmission assembly consists of a rotating shaft 502, a worm groove 5, a worm wheel 501, two second I-beam wheels 504, a second transmission belt 503, and a transmission shaft. The transmission shaft is rotatably connected to the lower end of the telescopic rod 514, the rotating shaft 502 is rotatably connected to the lower end of the processing housing 1, the worm wheel 501 is fixedly connected to the circumferential surface of the rotating shaft 502, the worm groove 5 is opened on the circumferential surface of the output shaft of the motor 2, the two second I-beam wheels 504 are respectively fixedly connected to the circumferential surfaces of the rotating shaft 502 and the transmission shaft, and the second transmission belt 503 is drivingly connected to the circumferential surfaces of the two second I-beam wheels 504.

[0026] In this embodiment: when the output shaft of motor 2 rotates, the power can be transmitted to the rotating shaft 502 through the meshing of the worm groove 5 and the worm wheel 501. Then, through the transmission of the second transmission belt 503 and the two second I-beam pulleys 504, the power can be transmitted to the transmission shaft. At this time, the telescopic rod 514 will also rotate with the transmission shaft. On the other hand, multiple heat dissipation fins 510 can sense and concentrate the heat of the processing shell 1. When the temperature of the processing shell 1 rises sharply, the sliding block 4 will rise with the moving block 303, and then the extension rod 514 will move upward through the pulling rod 506, causing the two clutch friction plates 515 to contact, transmitting the rotational force of the extension rod 514 to the driven shaft 513. Then, through the meshing transmission of the two bevel gears 511, the rotational force is transmitted to the cooling fan 512. The airflow generated by the rotation of the cooling fan 512 can then dissipate the heat. Multiple cooling fans 512 provide air cooling, thereby reducing the heat of the processing housing 1 and further lowering the temperature of the processing housing 1 and its interior, preventing the wood fibers from scorching and carbonizing. Through this design, when the temperature initially rises, slight slippage slightly reduces the screw 105 speed, reducing heat generation at the source. When the temperature rises rapidly, the moving block 303 moves significantly upward, increasing the slippage to minimize the screw 105 speed and frictional heat generation, while simultaneously triggering the clutch friction plate 515 to engage and activate the cooling fans 512 for forced cooling. At this time, the motor 2's output power is mainly consumed by the heat generated by slippage. Activating the cooling fans 512 effectively reuses some of the energy previously wasted on slippage for forced cooling. This demonstrates a logically sound and effective collaborative control strategy that sacrifices some energy efficiency for product quality and safety under extreme conditions.

[0027] Please refer to the details. Figure 1-7 The lower end of the processing shell 1 is fixedly connected to the mounting shell 103, and one end of the processing shell 1 is fixedly connected to the placement shell 104. The rotating shaft 502 and the transmission shaft are both rotatably connected to the lower inner wall of the mounting shell 103. The upper end of the processing shell 1 is fixedly connected to the inlet pipe 101, and one end of the processing shell 1 is fixedly connected to the extrusion pipe 102.

[0028] In this embodiment: the internal components can be protected by the mounting shell 103 and the placement shell 104, plastic and wood fiber can be easily added into the processing shell 1 by the addition tube 101, and wood-plastic composite material can be extruded by the extrusion tube 102.

[0029] Working principle: When it is necessary to mix plastic and wood fiber, the wood fiber and plastic can be added into the processing shell 1 at the same time. At this time, the current is transmitted to the inductive shell 201 through the conductive rod 210, conductive ring 205, moving ring 209, resistance wire 208 and conductive wire 206. Since the moving ring 209 is at the lowest end of the resistance wire 208, the resistance it receives when the current passes through is low, so the current transmitted is large. Therefore, the current value in the inductive shell 201 is also large, and the magnetization reaction of the magnetic powder inside is also large. The magnetic powder chain formed is also stronger. Through the "strong magnetic powder chain", the power output by the motor 2 can be transmitted to the central shaft 203 more completely. Then, through the cooperation of the first transmission belt 204 and the two first I-beams, the power is transmitted to the screw 105, so that the screw 105 rotates to mix the wood-plastic mixture while transmitting and extruding it to the other end. If the temperature inside the processing shell 1 continues to rise, on the one hand, after sensing the temperature, the heat-conducting plate 301 transfers the temperature to the heat-conducting plate 301 and the reaction shell 3 through the heat-conducting rod. At this time, the heat-shrinkable material inside the reaction shell 3 quickly contracts after sensing the temperature and pulls the moving block 303 upward. At this time, the moving block 303 drives the conductive rod 210, the conductive ring 205 and the moving ring 209 to move upward. At this time, if the current passes through the resistance wire 208 again, the current will decrease due to the increased resistance value from the resistance wire 208. As a result, the magnetization degree of the magnetic powder in the "strong magnetic powder chain" is insufficient due to the decrease in current, and the magnetic powder chain will be relatively loose. Therefore, the transmitted power will also decrease, which will reduce the rotation speed of the screw 105. By reducing the rotation speed of the screw 105, the pitch generated by the screw 105 is reduced, thereby reducing the degree of mixing friction between wood fiber and plastic, thereby reducing the generated heat, and finally achieving the purpose of reducing the temperature, preventing the wood fiber inside the processing shell 1 from being scorched and carbonized due to temperature. When the output shaft of motor 2 rotates, the power can be transmitted to the rotating shaft 502 through the meshing of the worm groove 5 and the worm wheel 501. Then, through the transmission of the second transmission belt 503 and the two second I-beam pulleys 504, the power can be transmitted to the transmission shaft. At this time, the telescopic rod 514 will also rotate with the transmission shaft. On the other hand, multiple heat dissipation fins 510 can sense and concentrate the heat of the processing shell 1. When the temperature of the processing shell 1 rises sharply, the sliding block 4 will rise with the moving block 303, and then the extension rod 506 will drive the extension end of the telescopic rod 514 to move upward, so that the two clutch friction plates 515 contact, and transmit the rotational force of the telescopic rod 514 to the driven shaft 513. Then, with the meshing transmission of the two bevel gears 511, the rotational force is transmitted to the cooling fan 512. The wind force generated by the rotation of the cooling fan 512 can cool the multiple cooling fans 512, thereby reducing the heat of the processing shell 1, further reducing the temperature of the processing shell 1 and its interior, and preventing the wood fiber from scorching and carbonizing.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wood-plastic composite extrusion molding process control device, comprising a processing shell (1), characterized in that: A screw (105) is rotatably connected to one side of the inner wall of the processing shell (1), and a motor (2) and an induction shell (201) are installed at the lower end of the processing shell (1). A central shaft (203) is rotatably connected to one side of the inner wall of the induction shell (201). A transmission plate (202) is fixedly connected to the output end of the motor (2) and one end of the central shaft (203). A rotating shaft is provided at one end of the screw (105). A first I-beam wheel is fixedly connected to the circumferential surface of the rotating shaft and the central shaft (203). A first transmission belt (204) is connected to the circumferential surface of the two first I-beam wheels. A thermal induction resistance mechanism is provided on the lower side of the processing shell (1). The thermal induction resistance mechanism is connected to the processing shell (1) and the transmission plate (202). It is used to sense the temperature inside the processing shell (1) and change the resistance and reduce the rotation speed of the screw (105) when the temperature rises.

2. The wood-plastic composite extrusion molding process control device according to claim 1, characterized in that: The thermally sensing variable resistance mechanism consists of a heat-conducting plate (301), a reaction shell (3), a heat-conducting block (302), a moving block (303), and a variable resistance assembly. The reaction shell (3) is fixedly connected to the lower end of the processing shell (1). The heat-conducting plate (301) is fixedly connected to the inner circumference of the processing shell (1), and a heat-conducting rod is provided at one end of the heat-conducting plate (301). The heat-conducting rod extends into the reaction shell (3). The heat-conducting block (302) is fixedly connected to the lower end of the heat-conducting rod. The moving block (303) is slidably connected to the reaction shell (3). The variable resistance assembly is located on the lower side of the reaction shell (3) and is connected to the moving block (303). It is used to increase the resistance value when the moving block (303) rises, thereby changing the current and thus reducing the rotational speed of the screw (105).

3. The wood-plastic composite extrusion molding process control device according to claim 2, characterized in that: The variable resistance assembly consists of an insulating shell (207), a conductive wire (206), a resistance rod (208), a moving ring (209), a conductive rod (210), and a conductive ring (205). The insulating shell (207) is fixedly connected to the lower end of the reaction shell (3). The resistance rod (208) is fixedly connected to the lower end of the reaction shell (3). The moving ring (209) is slidably connected to the circumferential surface of the resistance rod (208). The conductive ring (205) is fixedly connected to the circumferential surface of the moving ring (209). The conductive rod (210) is fixedly connected to the lower end of the moving block (303). The conductive ring (205) is slidably connected to the circumferential surface of the conductive rod (210). The conductive wire (206) is fixedly connected to the lower end of the resistance rod (208) and the circumferential surface of the inductive shell (201). The conductive rod (210) is electrically connected to an external current.

4. The wood-plastic composite extrusion molding process control device according to claim 3, characterized in that: It also includes an exhaust mechanism, which consists of a drive groove, a sliding block (4), a first piston shell (401), a first piston rod (402), a first piston plate (403), a transmission pipe (404), a second piston shell (405), a second piston plate (406), a second piston rod (407), a spring (408), an exhaust port (409), a sealing plate (410), and a receiving groove (411). The drive groove is opened on the circumferential surface of the reaction shell (3). The sliding block (4) is fixedly connected to the circumferential surface of the moving block (303) and is slidably connected in the drive groove. The first piston shell (401) is fixedly connected to the lower end of the processing shell (1). The first piston plate (403) is slidably connected in the first piston shell (401). The first piston rod (402) is fixedly connected to the first piston plate (404). The lower end of 403), and the first piston rod (402) is fixedly connected to the upper end of the sliding block (4), the exhaust port (409) is opened at the upper end of the processing shell (1), the storage groove (411) is opened on the inner wall of one side of the exhaust port (409), the second piston shell (405) is fixedly connected to one end of the processing shell (1), the transmission pipe (404) is fixedly connected to the circumferential surface of the first piston shell (401) and the circumferential surface of the second piston shell (405), the second piston plate (406) is slidably connected in the second piston shell (405), the second piston rod (407) is slidably connected in the second piston shell (405) and the storage groove (411), the sealing plate (410) is fixedly connected to one end of the second piston rod (407), and the spring (408) is sleeved on the circumferential surface of the second piston rod (407).

5. The wood-plastic composite extrusion molding process control device according to claim 4, characterized in that: It also includes a heat dissipation mechanism, which consists of an insulation shell (509), multiple heat dissipation fins (510), a cooling fan (512), two bevel gears (511), a driven shaft (513), two clutch friction plates (515), a follower block (507), a telescopic rod (514), a follower groove (508), a follower block (507), a pull rod (506), and a transmission assembly. The clutch shell (505) is located on the lower side of the processing shell (1), and the telescopic rod (514) is rotatably connected to the lower inner wall of the clutch shell (505). The multiple heat dissipation fins (510) are all fixedly connected to the lower end of the processing shell (1), the insulation shell (509) is fixedly connected to the lower end of the processing shell (1), and the cooling fan (512) is located at one end of the insulation shell (509). The driven shaft (513) is rotatably connected to the upper inner wall of the clutch housing (505). The two bevel gears (511) are respectively fixedly connected to the circumferential surfaces of the driven shaft (513) and the output shaft of the cooling fan (512). The clutch friction plate (515) is respectively fixedly connected to the near ends of the driven shaft (513) and the telescopic rod (514). The follower groove (508) is opened on the circumferential surface of the clutch housing (505). The follower block (507) is rotatably connected to the circumferential surface of the telescopic rod (514) through a bearing. The pull rod (506) is respectively fixedly connected to the near ends of the follower block (507) and the sliding block (4). The transmission assembly is located on the lower side of the processing housing (1) and is used to transmit the power of the output shaft of the motor (2) to the telescopic rod (514).

6. The wood-plastic composite extrusion molding process control device according to claim 5, characterized in that: The transmission assembly consists of a rotating shaft (502), a worm groove (5), a worm wheel (501), two second I-beams (504), a second transmission belt (503), and a transmission shaft. The transmission shaft is rotatably connected to the lower end of the telescopic rod (514). The rotating shaft (502) is rotatably connected to the lower end of the processing housing (1). The worm wheel (501) is fixedly connected to the circumferential surface of the rotating shaft (502). The worm groove (5) is opened on the circumferential surface of the output shaft of the motor (2). The two second I-beams (504) are respectively fixedly connected to the circumferential surfaces of the rotating shaft (502) and the transmission shaft. The second transmission belt (503) is drivenly connected to the circumferential surfaces of the two second I-beams (504).

7. The wood-plastic composite extrusion molding process control device according to claim 6, characterized in that: The lower end of the processing shell (1) is fixedly connected to the mounting shell (103), and one end of the processing shell (1) is fixedly connected to the placement shell (104). The rotating shaft (502) and the transmission shaft are both rotatably connected to the lower inner wall of the mounting shell (103).

8. The wood-plastic composite extrusion molding process control device according to claim 4, characterized in that: The upper end of the processing shell (1) is fixedly connected to the feeding pipe (101), and one end of the processing shell (1) is fixedly connected to the extrusion pipe (102).

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