Equipment for processing double-sided co-extruded plastic steel profiles

Abstract

The application relates to a double-face co-extruded plastic steel profile processing device and belongs to the technical field of plastic steel profile processing devices; the device comprises an extruder body, an extruding device is fixedly arranged at the front end of the extruder body, a material conveying device is arranged at the rear end of the upper side of the extruding device, and a driving mechanism is arranged in the extruder body; an auxiliary extruding mechanism and an auxiliary conveying mechanism are arranged at the rear end and the middle part of the extruding device respectively, the auxiliary extruding mechanism comprises a threaded rod rotatably arranged in the extruding device, an annular moving block is arranged on the outer side of the threaded rod, the auxiliary conveying mechanism comprises a conveying rod rotatably arranged in the extruding device, a first stirring paddle and a second stirring paddle are sleeved with the rear end of the conveying rod, the second stirring paddle rotates in the opposite direction of the first stirring paddle, and the second stirring paddle is slidably arranged on the outer side of the conveying rod; the device solves the problem that the single-screw extruder easily causes uneven melting of raw materials.

Description

Technical Field

[0001] This invention belongs to the technical field of plastic steel profile processing equipment, specifically relating to a device for processing double-sided co-extruded plastic steel profiles. Background Technology

[0002] Co-extrusion technology is often used in the production of PVC profiles. The co-extruder is an important part of the co-extrusion technology. It is specially developed to adapt to small flow rates of co-extruded materials and to be connected with different types of extruders. In the co-extrusion molding of profiles, the extruder that extrudes the "small material" is generally called the co-extruder, and the extruder that extrudes the main profile is called the main extruder. For the co-extrusion of rigid PVC profiles, the main extruder is often a twin-screw extruder, and the co-extruder is often a single-screw extruder.

[0003] During the extrusion process, the raw materials of a single-screw extruder need to be heated and melted during the conveying process. Heating of a single-screw extruder is usually achieved by an external heater (such as an electric heating coil or steam heating). However, due to the structural limitations of the screw and barrel, the heat transfer in the barrel is uneven, especially in the area near the screw and barrel wall, where the heat distribution is significantly different. This can easily lead to uneven melting of the raw materials. Uneven melting will cause inconsistent flow characteristics of the material, resulting in fluctuations in the thickness, diameter, or length of the extruded product. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and proposes a device for processing plastic-steel profiles through double-sided co-extrusion; it solves the problem that single-screw extruders are prone to causing uneven melting of raw materials.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0006] A device for processing double-sided co-extruded plastic-steel profiles includes an extruder body, an extrusion device fixedly mounted at the front end of the extruder body, a conveying device mounted on the upper rear end of the extrusion device, and a drive mechanism inside the extruder body. The drive mechanism includes a transmission shaft rotatably mounted inside the extruder body. An auxiliary extrusion mechanism and an auxiliary conveying mechanism are respectively mounted on the rear and middle sides of the extrusion device. The auxiliary extrusion mechanism includes a threaded rod rotatably mounted inside the extrusion device, with an annular moving block mounted on the outer side of the threaded rod. The auxiliary conveying mechanism includes a conveying rod rotatably mounted inside the extrusion device. A first stirring blade and a second stirring blade are sleeved on the outer rear end of the conveying rod, wherein the second stirring blade rotates in opposite directions to the first stirring blade, and the second stirring blade is slidably mounted on the outer side of the conveying rod. The transmission shaft is connected to the threaded rod and the conveying rod.

[0007] Furthermore, the drive mechanism also includes a connecting shaft, a drive motor, and a belt drive mechanism; a drive motor is provided at the rear of the extruder body, and the output shaft of the drive motor is connected to the rear end of the transmission shaft through a belt drive mechanism; a horizontal connecting shaft is also provided at the front of the extruder body, and the rear end of the connecting shaft is connected to the front end of the transmission shaft.

[0008] Furthermore, the auxiliary extrusion mechanism also includes a rotary wheel, a positioning block, a drive gear, and a threaded sleeve; two threaded rods are rotatably arranged inside the extrusion device, and two sets of external threads with opposite directions are provided on the outer wall of the threaded rods, with the two sets of external threads being staggered; the front ends of the two threaded rods are rotatably arranged on the front inner wall of the extrusion device, and the rear ends of the two threaded rods extend into the extruder body; a rotary wheel is fixedly arranged at the rear ends of the two threaded rods, and a driven gear is fixedly sleeved on the outer side of the rotary wheel; a drive gear is fixedly sleeved on the outer side of the connecting shaft, and the drive gear meshes with the driven gears on the outer sides of the two rotary wheels; a threaded sleeve is screwed onto the outer side of each threaded rod, and the two threaded sleeves are fixedly connected to the annular moving block.

[0009] Furthermore, the conveying rod is horizontally positioned along the axis of the extrusion device in the front-to-back direction, with its rear end fixedly connected to the front end of the connecting shaft, and a spiral blade fixedly installed on the outside of the conveying rod.

[0010] Furthermore, the first stirring blade is positioned behind the second stirring blade, and the first stirring blade is located below the conveying device; a gear ring is fixedly installed behind the first stirring blade, and a sun gear is fixedly sleeved on the outer side of the rear end of the conveying rod, with the gear ring located outside the sun gear; multiple planetary gears are arranged between the gear ring and the sun gear, and the planetary gears mesh with both the gear ring and the sun gear. The multiple planetary gears are rotatably mounted on a planetary carrier, which is rotatably sleeved on the outer side of the conveying rod, and is also fixedly connected to the inner wall of the extruder; the gear ring is rotatably connected to the planetary carrier.

[0011] Furthermore, a sliding groove is provided on the outside of the conveying rod, and a sliding block is fixedly provided on the inner wall of the second stirring blade. The sliding block is slidably engaged inside the sliding groove. A return spring is fixedly provided inside the sliding groove. One end of the return spring is fixedly connected to the inner wall of the sliding groove, and the other end of the return spring is fixedly connected to the sliding block.

[0012] Furthermore, a first annular wedge and a second annular wedge are fixedly provided on the side end faces of the first and second stirring blades that are close to each other, respectively. The first and second annular wedges are both sleeved on the outside of the conveying rod. The side end faces of the first and second annular wedges that are close to each other are both set as arc-shaped curve structures, and the arc-shaped curve structures on the first and second annular wedges are interlocked.

[0013] Furthermore, an auxiliary cleaning mechanism is provided inside the front side of the extrusion device. The auxiliary cleaning mechanism includes a compression ring and a positioning spring. The same compression ring is slidably sleeved on the outer side of the front end of the two threaded rods. A positioning spring is sleeved on the outer side of the front end of each of the two threaded rods. The two positioning springs are located on the front side of the compression ring. The front end of the positioning spring is fixedly connected to the inner wall of the front side of the extrusion device, and the rear end of the positioning spring is fixedly connected to the front end face of the compression ring.

[0014] Furthermore, the auxiliary cleaning mechanism also includes driven blocks and connecting springs; four circular arrays of driven blocks are arranged on the rear side of the extrusion ring, and multiple horizontal positioning rods are fixedly arranged on the end face of the driven blocks near the extrusion ring, with each positioning rod sliding forward and inserted into the extrusion ring; a connecting spring is sleeved on the outside of each positioning rod, with the front and rear ends of the connecting springs fixedly connected to the rear end face of the extrusion ring and the front end face of the driven block, respectively; four sets of circular arrays of trapezoidal tooth blocks are arranged on the front end face of the annular moving block, and a set of trapezoidal tooth grooves are arranged on the rear end face of each driven block, with the four sets of trapezoidal tooth blocks and the four sets of trapezoidal tooth grooves corresponding front to back.

[0015] Furthermore, the auxiliary cleaning mechanism also includes a telescopic slider; a set of telescopic sliders is fixedly installed at the front opening of the extrusion ring. The telescopic slider is formed by multiple hollow rings with gradually decreasing diameters from back to front slidingly connected to each other. An extrusion head is fixedly installed inside the front opening of the extrusion device, and the front end of the telescopic slider is fixedly connected to the extrusion head.

[0016] The beneficial effects of this invention compared to the prior art are as follows:

[0017] (1) By moving the annular moving block inside the extrusion device, the raw materials in the molten state can be stirred, so that the raw materials are heated evenly. The stirring action of the annular moving block can make the various components fully mixed in the molten state. The stirring can make the various components evenly distributed in the melt, avoiding the situation of excessive local component differences. In addition, during the extrusion process, the uniform heating and stirring can make the polymer molecular chains better oriented and distributed, making the extruded products more uniform in terms of mechanical properties (such as tensile strength, flexural strength, etc.) and thermal properties (such as heat distortion temperature, etc.), thus improving the overall quality and stability of the products.

[0018] (2) During the extrusion process, the molten material adheres to the inner wall. Over time, these adhered materials may undergo adverse changes such as degradation and discoloration, which may then mix into the new product, affecting the purity and performance of the product. By setting up the annular moving block and trapezoidal toothed block, the molten material adhering to the inner wall of the extrusion device can be cleaned. In addition, the adhered molten material will gradually accumulate, causing the extrusion channel to narrow or even become blocked, affecting the normal extrusion of the material. The cleaning effect of the annular moving block and trapezoidal toothed block can eliminate this hidden danger in time and ensure the smooth flow of the material in the extrusion device.

[0019] (3) By setting the first stirring blade, the second stirring blade, the first annular wedge and the second annular wedge, the raw material can be stirred when it enters the extrusion device, which can cause strong shearing and disturbance to the raw material, ensuring that different components are fully mixed and avoiding stratification or agglomeration. In addition, the forced disturbance of the first stirring blade and the second stirring blade can break the "bridging" or agglomeration of the raw material, ensuring that the material enters the extrusion device smoothly and reducing the risk of blockage.

[0020] (4) By setting the telescopic slider, the extrusion pressure of the molten material can be changed briefly. During the extrusion process, the molten material may encounter greater flow resistance due to high viscosity or narrow channel. The brief pressure change can generate greater driving force to help the material overcome the flow resistance and pass through narrow areas or blockage points smoothly. In addition, the brief pressure increase can help clean the residue or impurities in the extrusion channel and reduce the risk of blockage. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a partial structural diagram of the extruder body and extrusion unit after cross-section. Figure 1 ;

[0024] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle;

[0025] Figure 4 This is a partial structural diagram of the extruder body and extrusion unit after cross-section. Figure 2 ;

[0026] Figure 5 This is a schematic diagram of the auxiliary cleaning mechanism inside the extrusion unit after slitting. Figure 1 ;

[0027] Figure 6This is a schematic diagram of the auxiliary cleaning mechanism inside the extrusion unit after slitting. Figure 2 ;

[0028] Figure 7 This is a partial structural diagram of the extruder body and extrusion unit after cross-section. Figure 3 ;

[0029] Figure 8 This is a partial structural diagram of the extruder body and extrusion unit after cross-section. Figure 4 ;

[0030] Figure 9 yes Figure 8 A magnified view of a portion of point B in the middle;

[0031] Figure 10 This is a schematic diagram showing the connection between the first and second stirring blades.

[0032] Among them, 11 is the extruder body, 12 is the drive motor, 13 is the extrusion device, 14 is the material conveying device, 21 is the transmission shaft, 22 is the connecting shaft, 24 is the rotating wheel, 25 is the positioning block, 26 is the driving gear, 27 is the threaded rod, 28 is the threaded sleeve, 29 is the annular moving block, 30 is the trapezoidal toothed block, 31 is the first stirring blade, 32 is the first annular wedge, 33 is the gear ring, 34 is the planetary gear, 35 is the sun gear, 36 is the conveying rod, 37 is the sliding groove, 38 is the second stirring blade, 39 is the second annular wedge, 40 is the planetary carrier, 41 is the extrusion ring, 42 is the positioning spring, 43 is the driven block, 44 is the positioning rod, 45 is the connecting spring, and 46 is the telescopic slider. Detailed Implementation

[0033] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0034] like Figure 1As shown in Figure 10, this invention provides a device for processing double-sided co-extruded plastic steel profiles, including an extruder body 11, an extrusion device 13 fixedly disposed at the front end of the extruder body 11, a conveying device 14 disposed on the upper side of the rear end of the extrusion device 13, and a drive mechanism disposed inside the extruder body 11, the drive mechanism including a transmission shaft 21 rotatably disposed inside the extruder body 11; an auxiliary extrusion mechanism and an auxiliary conveying mechanism are respectively disposed on the rear side and the middle part inside the extrusion device 13, the auxiliary extrusion mechanism including a rotatable device 21. A threaded rod 27 is placed inside the extrusion device 13, and an annular moving block 29 is provided on the outside of the threaded rod 27. The auxiliary conveying mechanism includes a conveying rod 36, which is rotatably disposed inside the extrusion device 13. A first stirring blade 31 and a second stirring blade 38 are sleeved on the outer rear end of the conveying rod 36, wherein the second stirring blade 38 and the first stirring blade 31 rotate in opposite directions, and the second stirring blade 38 is slidably disposed on the outside of the conveying rod 36. A drive shaft 21 is connected to the threaded rod 27 and the conveying rod 36.

[0035] The extrusion device 13 is a cylindrical structure arranged horizontally front to back, and a plastic steel profile forming mold is fixedly installed at the front outlet of the extrusion device 13.

[0036] The drive mechanism also includes a connecting shaft 22, a drive motor 12, and a belt drive mechanism.

[0037] The drive shaft 21 is horizontally arranged along the front-to-back direction, with its rear end extending to the outer side of the rear end of the extruder body 11. A drive motor 12 is located at the rear of the extruder body 11, and its output shaft is connected to the rear end of the drive shaft 21 via a belt drive mechanism. A horizontally arranged connecting shaft 22 is also located at the front of the extruder body 11. Two limiting rods are fixedly installed on the outer side of the rear end of the connecting shaft 22, and these limiting rods are arranged radially along the connecting shaft 22. A through groove is located at the center of the front end face of the drive shaft 21, and two symmetrical limiting grooves are provided on the sidewall of the through groove, with the length of the limiting grooves aligned with the axis of the drive shaft 21. The rear end of the connecting shaft 22 is slidably inserted into the through groove at the front end of the drive shaft 21, and the two limiting rods on the connecting shaft 22 are slidably inserted into the two limiting grooves respectively. A telescopic spring is also fixedly installed at one end of the inner side of the through groove, and the telescopic spring is fixedly connected to the rear end of the connecting shaft 22.

[0038] The drive motor 12 drives the drive shaft 21 to rotate inside the extruder body 11 via a belt drive mechanism. When the drive shaft 21 rotates, it drives the connecting shaft 22 to rotate through the cooperating limiting rod and limiting groove. At the same time, the extension and contraction of the telescopic spring allows the connecting shaft 22 to move back and forth while rotating.

[0039] The auxiliary extrusion mechanism also includes a rotary wheel 24, a positioning block 25, a drive gear 26, and a threaded sleeve 28.

[0040] A heater is provided on the outside of the extrusion device 13 to change the raw material entering the extrusion device 13 from solid to molten fluid.

[0041] Two symmetrical threaded rods 27 are rotatably mounted inside the extrusion device 13. The threaded rods 27 are horizontally arranged along the front-rear direction, and their outer walls have two sets of external threads with opposite directions, staggered. The front ends of the two threaded rods 27 are rotatably mounted on the front inner wall of the extrusion device 13, and their rear ends extend into the extruder body 11. Two positioning blocks 25 are fixedly mounted on the inner wall of the extruder body 11, and the rear ends of the two threaded rods 27 are rotatably inserted into the two positioning blocks 25 respectively. A rotating wheel 24 is fixedly mounted at the rear end of each of the two threaded rods 27, and a driven gear is fixedly sleeved on the outside of the rotating wheel 24. A driving gear 26 is fixedly sleeved on the outside of the connecting shaft 22, and the driving gear 26 meshes with the driven gears on the outside of the two rotating wheels 24. A threaded sleeve 28 is screwed onto the outside of each threaded rod 27, and both threaded sleeves 28 are fixedly connected to the annular moving block 29. The annular moving block 29 is a ring-shaped structure located in a vertical plane in the left-right direction, and the outer cylindrical surface of the annular moving block 29 maintains sliding contact with the inner wall of the extrusion device 13.

[0042] The auxiliary conveying mechanism also includes a first annular wedge 32, a second annular wedge 39, a gear ring 33, a planetary gear 34, and a sun gear 35.

[0043] The conveying rod 36 is horizontally positioned along the axis of the extrusion device 13 in the front-to-back direction. The rear end of the conveying rod 36 is fixedly connected to the front end of the connecting shaft 22. The axis of the conveying rod 36 coincides with the axis of the connecting shaft 22. When the connecting shaft 22 rotates, it directly drives the conveying rod 36 to rotate. A helical blade is fixedly installed on the outside of the conveying rod 36. When the conveying rod 36 drives the helical blade to rotate synchronously, it conveys the material inside the extrusion device 13 from back to front.

[0044] The first stirring blade 31 is positioned behind the second stirring blade 38 and below the conveying device 14. A gear ring 33 is fixedly mounted on the rear side of the first stirring blade 31, and a sun gear 35 is fixedly sleeved on the outer side of the rear end of the conveying rod 36, with the gear ring 33 located outside the sun gear 35. Two planetary gears 34 are positioned between the gear ring 33 and the sun gear 35, meshing with both the gear ring 33 and the sun gear 35. Both planetary gears 34 are rotatably mounted on a planetary carrier 40, which is rotatably sleeved on the outer side of the conveying rod 36 and fixedly connected to the inner wall of the extruder body 11. Because the gear ring 33 is rotatably connected to the planetary carrier 40, the first stirring blade 31 can only rotate outside the conveying rod 36 and cannot slide relative to the conveying rod 36.

[0045] Two symmetrical sliding grooves 37 are provided on the outer side of the conveying rod 36, with the length of the sliding grooves 37 aligned with the axis of the conveying rod 36. Two sliding blocks are fixedly installed on the inner wall of the second stirring blade 38, and the two sliding blocks on the second stirring blade 38 are respectively slidably engaged with the two sliding grooves 37 on the outer side of the conveying rod 36. A return spring is fixedly installed inside each sliding groove 37, with one end of the return spring fixedly connected to the inner wall of the sliding groove 37 and the other end fixedly connected to the sliding block. The second stirring blade 38 achieves relative sliding on the outer side of the conveying rod 36 while rotating synchronously with it through the cooperation of the sliding blocks and the sliding grooves 37. A collar is fixedly installed on the side of the second stirring blade 38 away from the first stirring blade 31, located on the outer side of the sliding groove 37, to shield the sliding groove 37 and prevent molten material from entering the sliding groove 37.

[0046] A first annular wedge 32 and a second annular wedge 39 are fixedly disposed on the side end faces of the first stirring blade 31 and the second stirring blade 38 that are close to each other. Both the first annular wedge 32 and the second annular wedge 39 are sleeved on the outside of the conveying rod 36. The side end faces of the first annular wedge 32 and the second annular wedge 39 that are close to each other are both designed with arc-shaped curve structures, and the arc-shaped curve structure on the first annular wedge 32 fits into the arc-shaped curve structure on the second annular wedge 39.

[0047] An auxiliary cleaning mechanism is also provided inside the front side of the extrusion device 13. The auxiliary cleaning mechanism includes an extrusion ring 41, a positioning spring 42, a driven block 43, a positioning rod 44, a connecting spring 45, and a telescopic slider 46.

[0048] A single extrusion ring 41 is slidably sleeved on the outer side of the front end of each of the two threaded rods 27. The outer wall of the extrusion ring 41 maintains sliding contact with the inner wall of the extrusion device 13. A positioning spring 42 is sleeved on the outer side of the front end of each of the two threaded rods 27. The two positioning springs 42 are located in front of the extrusion ring 41. The front end of the positioning spring 42 is fixedly connected to the inner wall of the front side of the extrusion device 13, and the rear end of the positioning spring 42 is fixedly connected to the front end face of the extrusion ring 41.

[0049] Four circular array of driven blocks 43 are arranged on the rear side of the extrusion ring 41. Two horizontally positioned circular rods 44 are fixedly arranged on the end face of the driven blocks 43 near the extrusion ring 41. The positioning circular rods 44 are slidably inserted into the extrusion ring 41. A connecting spring 45 is sleeved on the outside of each positioning circular rod 44. The front and rear ends of the connecting spring 45 are fixedly connected to the rear end face of the extrusion ring 41 and the front end face of the driven block 43, respectively.

[0050] Four sets of trapezoidal toothed blocks 30 in a circular array are provided on the front end face of the annular moving block 29, and a set of trapezoidal toothed grooves are provided on the rear end face of each driven block 43. The four sets of trapezoidal toothed blocks 30 and the four sets of trapezoidal toothed grooves correspond to each other.

[0051] A set of retractable telescopic sliders 46 are fixedly installed at the front opening of the extrusion ring 41. The telescopic sliders 46 are formed by multiple hollow rings with gradually decreasing diameters from back to front, which slide and fit together. In the initial state, the cross-section inside the telescopic sliders 46 is trapezoidal. An extrusion head is fixedly installed inside the front opening of the extrusion device 13, and the front end of the telescopic sliders 46 is fixedly connected to the extrusion head.

[0052] The working principle of this invention is as follows:

[0053] Workers use the feeding device 14 to feed raw materials for manufacturing plastic steel profiles into the extrusion device 13. Since a heater is provided on the outside of the extrusion device 13, the raw materials entering the extrusion device 13 are transformed into a molten fluid.

[0054] During the startup of the material conveying device 14, the drive motor 12 needs to be started simultaneously. The drive motor 12 drives the transmission shaft 21 to rotate via the belt transmission mechanism, and the transmission shaft 21 drives the connecting rotating shaft 22 to rotate synchronously. The connecting rotating shaft 22 drives the conveying rod 36, which is fixedly connected to it, to rotate synchronously. The conveying rod 36 drives the spiral blades on its outer side to rotate synchronously, thereby conveying the molten material inside the extrusion device 13 from back to front, and finally conveying it through the extrusion head to the plastic steel profile molding die located at the output end of the extrusion device 13.

[0055] When the connecting shaft 22 rotates, it drives the conveying rod 36 to rotate synchronously. The conveying rod 36 drives the second stirring blade 38 to rotate synchronously through the cooperation of the sliding block and the sliding groove 37. At the same time, the conveying rod 36 drives the sun gear 35 to rotate synchronously. The sun gear 35 drives the two planet gears 34 to rotate. Since the planet carrier 40 is fixed, the two planet gears 34 drive the gear ring 33 to rotate. The gear ring 33 drives the first stirring blade 31 to rotate. The rotation direction of the planet gears 34 is opposite to that of the sun gear 35, and the rotation direction of the gear ring 33 is the same as that of the planet gears 34. Therefore, the rotation direction of the conveying rod 36, the second stirring blade 38, and the sun gear 35 is the same as that of the connecting shaft 22. The rotation direction of the planet gears 34, the gear ring 33, and the second stirring blade 38 is opposite to that of the connecting shaft 22. Therefore, the rotation direction of the first stirring blade 31 is opposite to that of the second stirring blade 38. Simultaneously, due to the difference in the number of teeth among the gear ring 33, planetary gears 34, and sun gear 35 (the sun gear 35 has fewer teeth than the gear ring 33), the rotational speed of the sun gear 35 is greater than that of the gear ring 33. Since the sun gear 35, conveying rod 36, connecting shaft 22, and second stirring blade 38 rotate at the same speed, and the gear ring 33 and first stirring blade 31 rotate at the same speed, the rotational speed of the second stirring blade 38 is greater than that of the first stirring blade 31. Thus, the first stirring blade 31 and the second stirring blade 38 not only rotate in opposite directions but also have different rotational speeds, effectively preventing molten material from remaining or accumulating inside the extrusion device 13.

[0056] When the first stirring blade 31 and the second stirring blade 38 rotate in opposite directions, the arc-shaped curved structures on the first annular wedge 32 and the second annular wedge 39 begin to slide relative to each other, causing misalignment. The second stirring blade 38 begins to slide away from the first stirring blade 31, and the return spring is gradually compressed. When the protruding part of the arc-shaped curved structure on the first annular wedge 32 abuts against the protruding part of the arc-shaped curved structure on the second annular wedge 39, the distance between the second stirring blade 38 and the first stirring blade 31 is at its greatest, and the return spring... The maximum compression is achieved. As the first stirring blade 31 and the second stirring blade 38 continue to rotate in opposite directions, the return spring begins to rebound. The second stirring blade 38 gradually slides towards the first stirring blade 31. When the protruding part of the arc-shaped curve structure on the first annular wedge 32 abuts against the groove part of the arc-shaped curve structure on the second annular wedge 39, the first annular wedge 32 and the second annular wedge 39 re-engage with each other, and the distance between the second stirring blade 38 and the first stirring blade 31 is closest, thus realizing that the second stirring blade 38 reciprocates while rotating.

[0057] When the first stirring blade 31 and the second stirring blade 38 rotate in opposite directions, the first annular wedge 32 and the second annular wedge 39 also rotate in opposite directions, thereby preventing the molten material from "bridging" at the bottom of the conveying device 14. This avoids the phenomenon of powdery or granular materials forming "bridging" in the conveying device 14 due to static electricity, uneven particle size, or humidity problems, which could lead to interruption of feeding or fluctuation in flow rate.

[0058] By rotating in opposite directions with the first stirring blade 31, the first annular wedge 32, the second stirring blade 38, and the second annular wedge 39, and by sliding back and forth with the second stirring blade 38 and the second annular wedge 39, the raw material can be stirred when the molten material enters the extrusion device 13. This can create strong shearing and disturbance effects on the raw material, ensuring that different components are fully mixed and avoiding stratification or agglomeration. In addition, the forced disturbance effect of the first stirring blade 31 and the second stirring blade 38 can break the "bridging" or agglomeration of the raw material, ensuring that the material enters the extrusion device 13 smoothly and reducing the risk of blockage.

[0059] When the connecting shaft 22 rotates, it drives two rotating wheels 24 to rotate synchronously through the meshing drive gear 26 and driven gear. The two rotating wheels 24 drive two threaded rods 27 to rotate synchronously. Since the threaded sleeves 28 are screwed to the threaded rods 27 and both threaded sleeves 28 are fixedly connected to the annular moving block 29, the two threaded sleeves 28 and the annular moving block 29 move forward synchronously inside the extrusion device 13. When the threaded sleeves 28 move forward to the front end of the external thread outside the threaded rod 27, as the threaded rod 27 continues to rotate, the threaded sleeves 28 begin to move backward along the threaded rod 27, thereby driving the annular moving block 29 to also begin to move backward, thus realizing the reciprocating movement of the annular moving block 29.

[0060] The annular moving block 29 drives four sets of trapezoidal toothed blocks 30 to move forward inside the extrusion device 13, which can agitate the raw materials in the molten state, thereby making the raw materials uniformly heated. The agitation effect of the annular moving block 29 can make various components fully mixed in the molten state, and agitation can make various components evenly distributed in the melt, avoiding excessive differences in local components. In addition, during the extrusion process, uniform heating and agitation can make the polymer molecular chains better oriented and distributed, making the extruded product more uniform in terms of mechanical properties (such as tensile strength, flexural strength, etc.) and thermal properties (such as heat distortion temperature, etc.), thus improving the overall quality and stability of the product.

[0061] In addition, during the process of the raw material being conveyed and melted inside the extrusion device 13 by the heater, the molten raw material itself has a certain viscosity and will adhere to the inner wall of the extrusion device 13. As the extrusion device 13 continues to work, the adhered molten material will affect the extrusion molding of the plastic steel profile. When the annular moving block 29 moves forward inside the extrusion device 13, the outer wall of the annular moving block 29 maintains sliding contact with the inner wall of the extrusion device 13. The annular moving block 29 and the four sets of trapezoidal toothed blocks 30 can clean the molten material adhering to the inner wall of the extrusion device 13. During the extrusion process, the molten material adheres to the inner wall. Over time, these adhered materials may undergo adverse changes such as degradation and discoloration, which may then mix into the new product, affecting the purity and performance of the product. Timely cleaning of the adhered material by the annular moving block 29 and the trapezoidal toothed blocks 30 can effectively avoid this situation. In addition, the adhered molten material will gradually accumulate, causing the extrusion channel to narrow or even become blocked, affecting the normal extrusion of the material. The cleaning action of the annular moving block 29 and the trapezoidal toothed blocks 30 can eliminate this hidden danger in time, ensuring the smooth flow of the molten material in the extrusion device 13.

[0062] The annular moving block 29 drives four sets of trapezoidal toothed blocks 30 to move forward inside the extrusion device 13, causing the four sets of trapezoidal toothed blocks 30 to gradually approach the four driven blocks 43 until the four sets of trapezoidal toothed blocks 30 engage with the trapezoidal tooth grooves on the four driven blocks 43. At this point, the annular moving block 29 and the four driven blocks 43 are in a locked state, and the annular moving block 29 drives the four driven blocks 43 to move synchronously towards the extrusion ring 41. During the synchronous movement of the annular moving block 29 and the four driven blocks 43, the connecting spring 45 between the driven blocks 43 and the extrusion ring 41 is gradually compressed. As the driven blocks 43 gradually approach the extrusion ring 41, the extrusion ring 41 is also moved forward by the rebound force of the connecting spring 45, causing the positioning spring 42 to be gradually compressed as well. The extrusion ring 41 forces the multiple hollow rings of the telescopic slider 46 to contract, thus shortening the overall length of the telescopic slider 46.

[0063] Because the telescopic slider 46 is hollow inside, and initially its internal cross-section is trapezoidal with a vertical width gradually decreasing from back to front, the inside of the telescopic slider 46 forms a channel for the flow of molten material. The gradually decreasing trapezoidal size increases the pressure during molten material extrusion. According to the principle of continuity in fluid mechanics, under steady-flow conditions, the flow rate of the fluid (here, the molten material) remains constant. When the outlet is trapezoidal and its size gradually decreases, the flow cross-sectional area at the outlet becomes smaller, and to maintain a constant flow rate, the flow velocity will increase accordingly.

[0064] Furthermore, as the telescopic slider 46 contracts, the size of the telescopic slider 46, which serves as the extrusion channel for the molten material, is in a state of phased change. That is, as the telescopic slider 46 contracts, the flow path of the molten material is shortened while the size of the discharge end of the extrusion channel remains unchanged. Due to the shortened flow path, the resistance experienced by the molten material during the extrusion process is reduced, making it easier to be extruded. Under the same driving power, a higher extrusion speed can be achieved.

[0065] The extrusion port of the molten material will exhibit a brief change, and as the annular moving block 29 returns to its initial position on the threaded rod 27, the telescopic slider 46 will also return to its initial position in the reverse direction under the restoring force of the positioning spring 42 and the connecting spring 45. By setting the telescopic slider 46, the extrusion pressure of the molten material can exhibit a brief change. During the extrusion process, the molten material may encounter greater flow resistance due to high viscosity or narrow channels. The brief pressure change can generate a greater driving force, helping the material overcome the flow resistance and pass smoothly through narrow areas or blockage points. In addition, the brief pressure increase can help clean the residues or impurities in the extrusion channel and reduce the risk of blockage.

[0066] Finally, the molten material is extruded through the telescopic slider 46 and injected into the plastic steel profile molding die located at the output end of the extrusion device 13.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A device for processing of a double-sided co-extruded plastic-steel profile, characterized in that: The utility model provides an extruder, including the extruder body (11), be provided with extrusion device (13) in the front end fixed of extruder body (11), be provided with feed device (14) on the rear end upper side of extrusion device (13), be provided with drive mechanism in the inside of extruder body (11), drive mechanism includes the transmission shaft (21) rotationally arranged in the inside of extruder body (11);It is provided with auxiliary extrusion mechanism and auxiliary conveying mechanism respectively in the inside rear side with the middle part of extrusion device (13), the auxiliary extrusion mechanism includes the threaded rod (27) rotationally arranged in the inside of extrusion device (13), threaded rod (27) outside is provided with annular moving block (29), the auxiliary conveying mechanism includes the conveying rod (36), and the conveying rod (36) is rotationally arranged in the inside of extrusion device (13), and the rear end outside of conveying rod (36) is sleeved with first stirring paddle (31) and second stirring paddle (38), wherein second stirring paddle (38) and first stirring paddle (31) rotate in the opposite direction, and second stirring paddle (38) is slidably arranged outside the conveying rod (36);Transmission shaft (21) is connected with threaded rod (27) and conveying rod (36); The first stirring paddle (31) is arranged on the rear side of the second stirring paddle (38), and the first stirring paddle (31) is located below the feed device (14); A gear ring (33) is fixedly arranged on the rear side of the first stirring paddle (31), a sun gear (35) is fixedly sleeved on the rear end outside of the conveying rod (36), and the gear ring (33) is located outside the sun gear (35); A plurality of planetary gears (34) are arranged between the gear ring (33) and the sun gear (35), the planetary gears (34) are engaged with the gear ring (33) and the sun gear (35) at the same time, and the plurality of planetary gears (34) are rotationally arranged on a planet carrier (40), the planet carrier (40) is rotationally sleeved outside the conveying rod (36), and the planet carrier (40) is fixedly connected with the inner wall of the extruder body (11); The gear ring (33) is rotationally connected to the planet carrier (40); A sliding groove (37) is arranged outside the conveying rod (36), a sliding block is fixedly arranged on the inner wall of the second stirring paddle (38), and the sliding block is slidably connected in the sliding groove (37); A return spring is fixedly arranged in the sliding groove (37), one end of the return spring is fixedly connected with the inner wall of the sliding groove (37), and the other end of the return spring is fixedly connected with the sliding block; First annular wedge blocks (32) and second annular wedge blocks (39) are fixedly arranged on the side end faces of the first stirring paddle (31) and the second stirring paddle (38) that are close to each other, the first annular wedge blocks (32) and the second annular wedge blocks (39) are sleeved outside the conveying rod (36); The side end faces of the first annular wedge blocks (32) and the second annular wedge blocks (39) that are close to each other are provided in a circular arc curve structure, and the circular arc curve structure on the first annular wedge block (32) is embedded in the circular arc curve structure on the second annular wedge block (39).

2. A device for processing a double co-extruded plastic-steel profile according to claim 1, characterized in that: The driving mechanism further comprises a connecting rotating shaft (22), a driving motor (12) and a belt transmission mechanism; the driving motor (12) is arranged at the rear side of the extruder body (11), and the output shaft of the driving motor (12) is connected with the rear end of the transmission shaft (21) through the belt transmission mechanism; a front-to-back horizontal connecting rotating shaft (22) is further arranged at the inner front side of the extruder body (11), and the rear end of the connecting rotating shaft (22) is connected with the front end of the transmission shaft (21).

3. A device for processing a double co-extruded plastic-steel profile according to claim 2, characterized in that: The auxiliary extruding mechanism further comprises a rotating wheel (24), a positioning block (25), a driving gear (26) and a threaded sleeve (28); two threaded rods (27) are rotatably arranged in the extruding device (13), and two groups of external threads with opposite rotation directions are arranged on the outer wall of the threaded rods (27), and the two groups of external threads are arranged alternately; the front ends of the two threaded rods (27) are rotatably arranged on the inner front wall of the extruding device (13), and the rear ends of the two threaded rods (27) extend into the extruder body (11); a rotating wheel (24) is fixedly arranged at the rear end of each threaded rod (27), and a driven gear is fixedly sleeved on the outer side of the rotating wheel (24); a driving gear (26) is fixedly sleeved on the outer side of the connecting rotating shaft (22), and the driving gear (26) is engaged with the driven gears on the outer sides of the two rotating wheels (24) at the same time; a threaded sleeve (28) is screwed on the outer side of each threaded rod (27), and the two threaded sleeves (28) are fixedly connected with the annular moving block (29) at the same time.

4. A device for processing a double co-extruded plastic-steel profile according to claim 2, characterized in that: The conveying rod (36) is arranged horizontally along the axis of the extruding device (13) in the front-to-back direction, the rear end of the conveying rod (36) is fixedly connected with the front end of the connecting rotating shaft (22), and helical blades are fixedly arranged on the outer side of the conveying rod (36).

5. A device for processing a double co-extruded plastic-steel profile according to claim 3, characterized in that: An auxiliary cleaning mechanism is further arranged at the inner front side of the extruding device (13), and the auxiliary cleaning mechanism comprises a pressing ring (41) and a positioning spring (42); the same pressing ring (41) is slidably sleeved on the outer side of the front end of the two threaded rods (27), and a positioning spring (42) is sleeved on the outer side of the front end of each threaded rod (27); the two positioning springs (42) are arranged at the front side of the pressing ring (41), the front end of the positioning spring (42) is fixedly connected with the inner front wall of the extruding device (13), and the rear end of the positioning spring (42) is fixedly connected with the front end face of the pressing ring (41).

6. A device for processing a double co-extruded plastic-steel profile according to claim 5, characterized in that: The auxiliary cleaning mechanism further comprises a driven block (43) and a connecting spring (45); four circular arrays of the driven block (43) are arranged on the rear side of the extrusion ring (41), a plurality of front and rear horizontal positioning round rods (44) are fixedly arranged on the side end face of the driven block (43) close to the extrusion ring (41), and the positioning round rods (44) are all slidably inserted into the inside of the extrusion ring (41); one connecting spring (45) is sleeved on the outside of each positioning round rod (44), and the front and rear ends of the connecting spring (45) are fixedly connected with the rear end face of the extrusion ring (41) and the front end face of the driven block (43) respectively; four groups of circular arrays of trapezoidal tooth blocks (30) are arranged on the front end face of the annular moving block (29), one group of trapezoidal tooth grooves is arranged on the rear end face of each driven block (43), and the four groups of trapezoidal tooth blocks (30) correspond to the four groups of trapezoidal tooth grooves front and back.

7. A device for processing a double co-extruded plastic-steel profile according to claim 6, characterized in that: The auxiliary cleaning mechanism further comprises a telescopic sliding block (46); a group of telescopic telescopic sliding blocks (46) are fixedly arranged at the front end opening of the extrusion ring (41), the telescopic sliding block (46) is formed by a plurality of hollow rings which are gradually reduced in diameter from back to front and are slidably sleeved with each other, an extrusion head is fixedly arranged on the inside of the front end opening of the extrusion device (13), and the front end of the telescopic sliding block (46) is fixedly connected with the extrusion head.

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