Film extruder

Abstract

The invention relates to the technical field of film production equipment, in particular to a film extruder which comprises a machine body, a feeding port is formed in the extruder, a feeding mechanism is arranged on the feeding port and comprises a feeding shell, a plurality of feeding cylinders are fixedly mounted at the top end of the interior of the feeding shell, weighing tables are slidably mounted in the feeding cylinders, and the weighing tables are fixedly mounted on the machine body. The feeding cylinder is provided with a second signal point, and an adjusting mechanism is arranged between the feeding cylinder and the second signal point and used for adjusting the position of the second signal point. Intermittent mechanisms are arranged among the multiple feeding cylinders and used for alternate feeding of the multiple feeding cylinders. The feeding mechanism is arranged to be matched with the feeding pipe, the electromagnetic valve and the intermittent mechanism, cyclic intermittent feeding can be carried out while weight quantitative conveying is achieved, the weight conveyed each time is consistent, and therefore the feeding precision and the feeding uniformity are precisely regulated and controlled, the feeding precision and the feeding uniformity are not affected by the density of raw materials, and the production efficiency is improved. And the precision and the uniformity of film feeding are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of film production equipment, and particularly to a film extruder. Background Art

[0002] An extruder consists of a barrel, a screw, heating, temperature control, power transmission, etc. In the extrusion process of a traditional plastic extruder, it is achieved by external heating of the barrel, the friction between solid materials and the barrel and screw, and the shear force of the melt. The feeding method of a film extruder is crucial for ensuring production stability, film thickness uniformity, and product quality. The commonly used methods are screw feeders or vibrating feeders, which achieve quantitative feeding by controlling the volume of materials per unit time.

[0003] However, the accuracy of the commonly used methods during feeding is greatly affected by the material density and particle shape, and is only applicable to materials with little density change. When dealing with recycled materials or mixtures of recycled materials and new materials, due to the poor uniformity of recycled materials and mixtures, the feeding accuracy of the extruder is low, resulting in an impact on the product quality of the film. In view of this, we propose a film extruder. Summary of the Invention

[0004] The purpose of the present invention is to provide a film extruder, which solves the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A film extruder includes a machine body. An inlet is provided on the extruder, and a feeding mechanism is arranged on the inlet. The feeding mechanism includes a feeding housing. A plurality of feeding cylinders are fixedly installed at the inner top of the feeding housing. A weighing platform is slidably installed in the feeding cylinder. A signal point two is arranged on the feeding cylinder, and an adjusting mechanism is arranged between the feeding cylinder and the signal point two for adjusting the position of the signal point two;

[0007] An intermittent mechanism is arranged between the plurality of feeding cylinders for alternating feeding of the plurality of feeding cylinders.

[0008] Preferably, a feeding bin is fixedly installed at the bottom end of the feeding housing. The feeding bin is fixedly connected to the inlet. A plurality of sliding cylinders are fixedly installed at the top end of the feeding housing. The plurality of sliding cylinders are distributed in a circular array. A fixing rod is fixedly installed at the inner top of the sliding cylinder. A sliding rod is slidably sleeved on the surface of the fixing rod. The bottom end of the sliding rod is fixedly connected to the weighing platform. A weighing spring is installed between the inner parts of the fixing rod and the sliding rod.

[0009] Preferably, a control rod is fixedly installed at the top end position of the surface of the sliding rod, and a signal rod is fixedly installed at the bottom end of the control rod.

[0010] Preferably, a plurality of signal points one are fixedly installed at the top end position of the surface of the feeding cylinder, and both the signal point one and the signal point two are adapted to the signal rod.

[0011] Preferably, a plurality of feeding pipes are fixedly installed at the top end of the feeding shell, electromagnetic valves are arranged on the feeding pipes, and the electromagnetic valves, the signal rod, the signal point one, and the signal point two are controlled by PIC.

[0012] Preferably, the adjusting mechanism includes a sliding groove, the sliding groove is opened on the surface of the feeding cylinder, the sliding groove is slidably connected to the signal point two, a lead screw is rotatably installed in the sliding groove, and the lead screw is threadedly connected to the signal point two.

[0013] Preferably, a driven gear is fixedly installed at the bottom end of the lead screw, the driven gear is engaged with a toothed ring, and the outer side of the toothed ring is meshed with a driving gear.

[0014] Preferably, the intermittent mechanism includes a rotating groove, the rotating groove is fixedly opened at the bottom end of the weighing table, a sealing plate is slidably installed in the rotating groove, and a linkage rod is fixedly installed at the bottom end of the sealing plate.

[0015] Preferably, a workbench is fixedly installed at the position near the bottom end of the surface of the feeding cylinder, a rotating rod is rotatably installed at the bottom end of the workbench, and the rotating rod is adapted to the linkage rod.

[0016] Preferably, the inside of the weighing table is of a frustum structure, an opening is opened at the bottom end of the weighing table, and the opening is adapted to the sealing plate.

[0017] By means of the above technical solutions, the present invention provides a film extruder that at least has the following beneficial effects:

[0018] (1) By setting the feeding mechanism in cooperation with the feeding pipe, the electromagnetic valve and the intermittent mechanism, the present invention can achieve cyclic intermittent feeding while quantitatively conveying by weight, and the weight conveyed each time is the same, so as to accurately control the feeding accuracy and the feeding uniformity, and is not affected by the raw material density, effectively improving the feeding accuracy and uniformity of the film.

[0019] (2) By setting the feeding mechanism in cooperation with the adjusting mechanism, the present invention can synchronously and accurately control the position of the signal point two, thereby controlling the deformation distance of the weighing spring, and further can accurately adjust the weight of the raw materials temporarily stored on the weighing table, and can effectively adapt to different weight feeding requirements, improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0021] Figure 1 is the structural schematic diagram of the present invention;

[0022] Figure 2 is the internal structural schematic diagram of the extruder of the present invention;

[0023] Figure 3 is the overall structural schematic diagram of the feeding mechanism of the present invention;

[0024] Figure 4 is the internal structural schematic diagram of the feeding housing of the present invention;

[0025] Figure 5 is the Figure 4 partial structural schematic diagram of the present invention;

[0026] Figure 6 is the internal structural schematic diagram of the feeding cylinder of the present invention;

[0027] Figure 7 is the overall structural schematic diagram of the adjusting mechanism of the present invention;

[0028] Figure 8 is the partial structural schematic diagram of the adjusting mechanism of the present invention;

[0029] Figure 9 is the Figure 8 amplified schematic diagram of area A in the present invention;

[0030] Figure 10 is the overall structural schematic diagram of the intermittent mechanism of the present invention;

[0031] Figure 11 is the partial structural schematic diagram of the intermittent mechanism of the present invention.

[0032] In the figure: 1, body; 11, barrel; 12, screw; 13, die head; 14, feed inlet;

[0033] 2, feeding mechanism; 21, feed bin; 22, feed housing; 23, feed cylinder; 24, sliding cylinder; 25, fixed rod; 26, sliding rod; 27, weighing spring; 28, weighing platform; 29, control rod; 210, signal rod; 211, signal point one; 212, signal point two;

[0034] 3, adjusting mechanism; 31, sliding groove; 32, lead screw; 33, driven gear; 34, gear ring; 35, driving gear; 341, internal rack; 342, external rack;

[0035] 4, intermittent mechanism; 41, workbench; 42, rotating rod; 43, rotating groove; 44, sealing plate; 45, linkage rod;

[0036] 5, feed pipe; 6, solenoid valve. Detailed implementation manners

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figure 1-Figure 2 , a film extruder, including a machine body 1 for producing films. The machine body 1 includes a barrel 11, and a screw 12 is rotatably installed in the barrel 11. The barrel 11 and the screw 12 are key parts of the machine body 1. The screw 12 rotates in the barrel 11 to convey, compact, melt, and homogenize the material, and finally extrude the melt. One end of the screw 12 is fixedly connected to the output shaft of the motor. The motor is used to drive the screw 12 to ensure the stable rotation speed of the screw 12 and can achieve speed change according to needs. An inlet 14 is provided at one side of the top of the barrel 11 for adding raw materials into the barrel 11. At the same time, a heating and cooling mechanism (not shown in the figure) is provided on the barrel 11 to ensure that the material reaches the required temperature conditions during the extrusion process. The barrel 11 can be cooled by water cooling or air cooling, and the screw 12 is mainly cooled by central water cooling.

[0039] Please refer to Figure 3-Figure 6 , an inlet mechanism 2 is provided on the inlet 14 for precise feeding of raw materials. The inlet mechanism 2 includes a feed bin 21, and the feed bin 21 is fixedly connected to the inlet 14. The feed bin 21 is a frustum structure with a smooth inner wall, which can effectively prevent the raw materials from getting stuck on the inner surface of the feed bin 21, resulting in inaccurate feeding weight. A feed housing 22 is fixedly installed at the top of the feed bin 21, and the feed housing 22 plays a role in protection and dust prevention. A plurality of feed cylinders 23 are fixedly installed at the top of the feed housing 22. Preferably, there are three feed cylinders 23 and they are distributed in a circular array. A plurality of feed pipes 5 are fixedly connected to the top of the feed housing 22, and the feed pipes 5 are located at the center of the top of the feed cylinders 23 for conveying raw materials.

[0040] A feed pipe 5 is fixedly installed at the top of the feed housing 22. The other end of the feed pipe 5 is connected to the feed bin. The feed pipe 5 is used for feeding raw materials. An electromagnetic valve 6 is fixedly installed on the feed pipe ⑤, and the opening and closing of the electromagnetic valve 6 are used to control the feeding.

[0041] At the top of the feed housing 22, a plurality of sliding cylinders 24 are fixedly installed. At the top end inside the sliding cylinder 24, a fixed rod 25 is fixedly installed. A sliding rod 26 is slidably sleeved on the surface of the fixed rod 25. Both the fixed rod 25 and the sliding rod 26 are hollow structures. A weighing spring 27 is fixedly installed between the fixed rod 25 and the sliding rod 26. According to Hooke's law, within the elastic limit of the spring, the elastic force F of the spring is proportional to the elongation or compression x of the spring. Its expression is F = -kx or ΔF = -kΔx, where k is the spring constant, and the negative sign indicates that the direction of the elastic force is opposite to the direction of deformation, so that the weight of the raw material can accurately control the feeding weight of the raw material through the deformation of the weighing spring 27. The plurality of sliding rods 26 are distributed in a circular array, so that the pressure received by each weighing spring 27 is consistent, ensuring the accuracy during weighing.

[0042] At the bottom end of the sliding rod 26, a weighing platform 28 is fixedly installed. The weighing platform 28 is slidably connected to the feed cylinder 23. The weighing platform 28 is integrally cylindrical in structure, with a frustum structure inside and an opening at the bottom end. At the same time, the top end of the weighing platform 28 is a smooth arc-shaped structure. The overall cylindrical structure of the weighing platform 28 makes the sliding connection between the weighing platform 28 and the feed cylinder 23 have no gap, avoiding the raw material from getting stuck or leaking. The frustum structure inside the weighing platform 28 and the smooth arc-shaped structure at the top end enable the raw material not to remain on the weighing platform 28 or on the contact surface between the weighing platform 28 and the feed cylinder 23 during unloading, ensuring that the raw material will completely flow out through the opening and there will be no phenomenon of the raw material remaining on the weighing platform 28.

[0043] At a position near the top end on the surface of the sliding rod 26, a control rod 29 is fixedly connected. At the bottom end of the control rod 29, a signal rod 210 is fixedly installed. At the top end of the surface of the feed cylinder 23, a signal point one 211 is fixedly installed, and the signal point one 211 is sleeved on the control rod 29. When the weighing platform 28 is in a completely empty state, under the elastic force of the weighing spring 27, the signal rod 210 contacts the signal point one 211. The contact signal is controlled by the PLC, so that the solenoid valve 6 is opened to achieve the feeding effect. A signal point two 212 is also provided on the feed cylinder 23. When the weighing platform 28 is continuously fed with raw materials, the control rod 29 drives the signal rod 210 to move downward. Until the raw material on the weighing platform 28 reaches the required weight, the signal rod 210 contacts the signal point two 212, and then the contact signal is controlled by the PLC to close the solenoid valve 6, ensuring a certain weight of the material on the weighing platform 28.

[0044] Please refer to Figure 7-Figure 9 , the signal point two 212 is connected to the feed cylinder 23 through an adjusting mechanism 3. The adjusting mechanism 3 is used to adjust the position of the signal point two 212, thereby changing the displacement distance of the signal rod 210, causing the deformation of the weighing spring 27 to change, and further adjusting the weight of the material on the weighing platform 28.

[0045] The adjusting mechanism 3 includes a sliding groove 31 which is opened on the surface of the feeding cylinder 23 and is slidably connected to the signal point two 212, so that the signal point two 212 can slide along the sliding groove 31. A lead screw 32 is rotatably installed in the sliding groove 31, and the lead screw 32 is threadedly connected to the signal point two 212, so that by rotating the lead screw 32, the displacement of the signal point two 212 along the sliding groove 31 can be controlled, and it can also play a role in self-locking.

[0046] The lead screw 32 penetrates through the bottom end of the sliding groove 31 and is fixedly installed with a driven gear 33. A gear ring 34 is rotatably installed on the surface of the feeding cylinder 23. An internal rack 341 is arranged inside the gear ring 34, and the internal rack 341 is meshed with the driven gear 33. By rotating the gear ring 34, the driven gear 33 can be driven to rotate. When the driven gear 33 rotates, the lead screw 32 can be driven to rotate so as to adjust the position of the signal point two 212. An external rack 342 is arranged outside the gear ring 34, and the external rack 342 is meshed with a driving gear 35. A motor is fixedly connected to the driving gear 35.

[0047] By the motor, the driving gear 35 can be controlled to rotate. The driving gear 35 meshes with the external rack 342 to drive the gear ring 34 to rotate. When the gear ring 34 rotates, the driven gear 33 is driven to rotate through the meshing of the internal rack 341 and the driven gear 33. The driven gear 33 drives the lead screw 32 to rotate, so that all the signal points two 212 can be driven to have synchronous displacement, and further the position of the signal point two 212 can be adjusted.

[0048] Please refer to Figure 10-11 , an intermittent mechanism 4 is arranged between multiple weighing platforms 28 for the cyclic feeding of raw materials. The intermittent mechanism 4 includes a workbench 41 which is fixedly installed at a position near the bottom end of the surface of the feeding cylinder 23. A rotating rod 42 is rotatably installed at the bottom end of the workbench 41. A motor is arranged at the top end of the workbench 41, and the output shaft of the motor penetrates through the workbench 41 and is fixedly connected to the rotating rod 42. The motor can control the rotation of the rotating rod 42.

[0049] The intermittent mechanism 4 further includes a rotating groove 43 which is fixedly opened at the bottom end of the weighing platform 28. A sealing plate 44 is slidably installed in the rotating groove 43, and the sealing plate 44 is used for blocking and opening the weighing platform 28. A linkage rod 45 is fixedly connected to the bottom end of the sealing plate 44. And when the weighing platform 28 is in a completely empty state, the linkage rod 45 is completely received inside the feeding cylinder 23. At the same time, a spring is connected between the sealing plate 44 and one end of the rotating groove 43.

[0050] One end of the rotating rod 42 away from the workbench 41 is in a "C" - shaped structure, and the linkage rod 45 can be clamped within the space of the "C" - shaped structure. When the rotating rod 42 rotates, the rotating rod 42 contacts the linkage rod 45, thereby driving the linkage rod 45 to rotate synchronously. Since the rotating groove 43 is an arc - shaped structure, the linkage rod 45 can drive the sealing plate 44 to rotate synchronously until the sealing plate 44 rotates to one end of the rotating groove 43 and gets stuck. The displacement of the sealing plate 44 causes the bottom end of the weighing platform 28 to open, and the raw material enters the feeding bin 21 through the weighing platform 28 and finally enters the machine body 1. While the raw material is falling, the weight of the raw material on the weighing platform 28 continuously decreases. Under the elastic force of the weighing spring 27, the weighing platform 28 continuously rises. When all the raw material falls into the machine body 1, the weighing platform 28 rises to the top. At this time, the linkage rod 45 completely enters the interior of the feeding cylinder 23, the rotating rod 42 disengages from the linkage rod 45 and continues to rotate, and the sealing plate 44 re - seals the weighing platform 28 under the elastic force of the spring.

[0051] When the rotating rod 42 continues to rotate, it is clamped with another linkage rod 45, driving another weighing platform 28 to discharge materials, thus realizing alternating discharging, and the weight of each discharging is consistent, realizing accurate and uniform discharging.

[0052] A film extruder, whose working principle is as follows: Start the motor to drive the driving gear 35 to rotate. Through the meshing action of the driving gear 35 and the external rack 342 of the gear ring 34, the gear ring 34 is driven to rotate synchronously. When the gear ring 34 rotates, due to the meshing action of the internal rack 341 and the driven gear 33, the driven gear 33 can be driven to rotate. The driven gear 33 drives the lead screw 32 to rotate, and the lead screw 32 drives the signal point two 212 to displace along the sliding groove 31, thereby adjusting the position of the signal point two 212. The change in the position of the signal point two 212 can change the displacement distance of the signal rod 210, causing the spring deformation amount of the weighing spring 27 to change, and further adjusting the weight of each feeding of the weighing platform 28. After the position of the signal point two 212 is adjusted, the motor is turned off.

[0053] Start the solenoid valve 6. The film raw material enters the weighing platform 28 through the feeding pipe 5. Under the weight of the material, the weighing platform 28 slides down along the sliding cylinder 24. The displacement of the weighing platform 28 drives the sliding rod 26 to move down along the fixed rod 25, thereby driving the weighing spring 27 to deform. According to Hooke's law, within the elastic limit of the spring, the elastic force F of the spring is proportional to the elongation or compression amount x of the spring. Its expression is F = - kx or ΔF = - kΔx, where k is the spring stiffness coefficient, and the negative sign indicates that the direction of the elastic force is opposite to the direction of deformation, so that the weight of the raw material can be controlled by the deformation amount of the weighing spring 27.

[0054] When the sliding rod 26 moves downward, it will drive the control rod 29 and the signal rod 210 to move downward synchronously, and the downward distance is the same as the deformation of the weighing spring 27. When the signal rod 210 contacts the signal point two 212, through the transmission of the electrical signal, the solenoid valve 6 is closed and the material feeding is closed.

[0055] Start the motor to drive the rotating rod 42 to rotate along the workbench 41. When the rotating rod 42 rotates, it will abut against the surface of the linkage rod 45, thereby driving the linkage rod 45 to rotate along the rotating groove 43. The linkage rod 45 drives the sealing plate 44 to displace synchronously, so that the bottom end of the weighing table 28 is opened, and the material enters the feeding bin 21 through the bottom opening of the weighing table 28, and then can enter the machine body 1 through the feeding port 14. When the material leaves the weighing table 28, the weight on the weighing table 28 decreases. Under the elastic force of the weighing spring 27, the weighing table 28 will gradually move upward. When all the materials are discharged, the signal rod 210 contacts the signal point one 211, so that the solenoid valve 6 is reopened and the feeding starts again.

[0056] When the weighing table 28 rises, it will drive the linkage rod 45 to rise synchronously. When the signal rod 210 contacts the signal point one 211, the linkage rod 45 is separated from the rotating rod 42, and the sealing plate 44 returns to its original position. The rotating rod 42 rotates under the action of the motor and contacts another linkage rod 45, thereby driving the linkage rod 45 to rotate along the rotating groove 43 and opening another sealing plate 44, thus realizing alternate feeding and the weight of each feeding being the same.

[0057] After the raw material enters the machine body 1 through the feeding port 14, it is conveyed to the compression section by the screw 12. Due to the gradually decreasing depth of the screw groove of the screw 12 and the resistance of the die head, the raw material gradually forms high pressure and is further compacted. The compacted raw material is conveyed to the melting section, where the raw material is heated and melted into a molten state, and finally extruded into a film through the die head 13.

[0058] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A film extruder, characterized in that: It includes a machine body (1), a feeding port (14) is provided on the machine body (1), a feeding mechanism (2) is arranged on the feeding port (14), the feeding mechanism (2) includes a feeding shell (22), a plurality of feeding cylinders (23) are fixedly installed at the inner top end of the feeding shell (22), a weighing platform (28) is slidably installed in the feeding cylinder (23), a signal point two (212) is arranged on the feeding cylinder (23), and an adjusting mechanism (3) is arranged between the feeding cylinder (23) and the signal point two (212) for adjusting the position of the signal point two (212); An intermittent mechanism (4) is arranged between the plurality of feeding cylinders (23) for alternately feeding the plurality of feeding cylinders (23).

2. The thin film extruder according to claim 1, characterized in that: A feeding bin (21) is fixedly installed at the bottom end of the feeding shell (22), the feeding bin (21) is fixedly connected to the feeding port (14), a plurality of sliding cylinders (24) are fixedly installed at the top end of the feeding shell (22), the plurality of sliding cylinders (24) are distributed in a circular array, a fixing rod (25) is fixedly installed at the inner top end of the sliding cylinder (24), a sliding rod (26) is slidably sleeved on the surface of the fixing rod (25), the bottom end of the sliding rod (26) is fixedly connected to the weighing platform (28), and a weighing spring (27) is installed between the fixing rod (25) and the inner part of the sliding rod (26).

3. The thin film extruder according to claim 2, characterized in that: A control rod (29) is fixedly installed at the top end position of the surface of the sliding rod (26), and a signal rod (210) is fixedly installed at the bottom end of the control rod (29).

4. A film extruder according to claim 1, characterized in that: A plurality of signal points one (211) are fixedly installed at the top end position of the surface of the feeding cylinder (23), and both the signal point one (211) and the signal point two (212) are adapted to the signal rod (210).

5. A film extruder according to claim 4, characterized in that: A plurality of feeding pipes (5) are fixedly installed at the top end of the feeding shell (22), electromagnetic valves (6) are arranged on the feeding pipes (5), and the electromagnetic valves (6) are controlled by PIC together with the signal rod (210), the signal point one (211), and the signal point two (212).

6. A film extruder according to claim 1, characterized in that: The adjusting mechanism (3) includes a sliding groove (31), the sliding groove (31) is opened on the surface of the feeding cylinder (23), the sliding groove (31) is slidably connected to the signal point two (212), a lead screw (32) is rotatably installed in the sliding groove (31), and the lead screw (32) is threadedly connected to the signal point two (212).

7. A film extruder according to claim 6, characterized in that: A driven gear (33) is fixedly installed at the bottom end of the lead screw (32), the driven gear (33) meshes with a toothed ring (34), and the outer side of the toothed ring (34) is meshed with a driving gear (35).

8. A film extruder according to claim 1, characterized in that: The intermittent mechanism (4) includes a rotating groove (43), the rotating groove (43) is fixedly opened at the bottom end of the weighing platform (28), a sealing plate (44) is slidably installed in the rotating groove (43), and a linkage rod (45) is fixedly installed at the bottom end of the sealing plate (44).

9. A film extruder according to claim 8, characterized in that: A workbench (41) is fixedly installed on the surface of the feeding cylinder (23) near the bottom end. A rotating rod (42) is rotatably installed at the bottom end of the workbench (41), and the rotating rod (42) is adapted to a linkage rod (45).

10. A film extruder according to claim 9, characterized in that: The interior of the weighing platform (28) is a frustum structure. An opening is formed at the bottom end of the weighing platform (28), and the opening is adapted to a sealing plate (44).

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