A PVA blow molding screw structure

Abstract

The present invention belongs to the technical field of PVA blow molding screws, and specifically relates to a PVA blow molding screw structure, which includes PVA blow molding equipment. The PVA blow molding equipment includes a material chamber, a chamber, a feeding chamber, a driving chamber, a blowing pipe and an exhaust hole; the chamber pipe is connected to the bottom of the material chamber, the feeding chamber pipe is connected to the bottom of the chamber, the driving chamber is fixedly installed on the left side of the feeding chamber and is interconnected, the blowing pipe is connected to the right side of the feeding chamber, a motor is fixedly installed on the inner wall of the driving chamber, an insertion rod is fixedly connected to the output end of the motor, a feeding pipe is connected to the bottom of the chamber, a screw barrel is provided inside the feeding chamber, the screw barrel is connected to the bottom of the feeding pipe, and a screw is provided inside the screw barrel. The device solves the problem that the current PVA blow molding screw is easily blocked and difficult to dredge during blow molding, and also facilitates the high fluidity of the melt and is more conducive to the stability of the discharge.

Description

Technical Field

[0001] The invention belongs to the technical field of PVA blow molding screws, and particularly relates to a PVA blow molding screw structure. Background Art

[0002] The screw of a blow molding machine primarily consists of a body, flights, and flutes. The body, the backbone of the screw, is typically made of high-strength material to withstand the high temperatures and pressures of the plastic melting process. The flights and flutes propel the plastic particles forward as the screw rotates, gradually melting the plastic through shear forces and friction between the plastic particles. As the screw rotates, the molten plastic is further mixed and homogenized before being transported to the mold for blow molding. However, during blow molding, excessive accumulation of high-temperature molten material can cause blockage in the blow tube, a phenomenon that has become a pressing issue for researchers in this field. Summary of the Invention

[0003] The object of the present invention is to provide a PVA blow molding screw structure to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a PVA blow molding screw structure, including a PVA blow molding device, the PVA blow molding device including a material chamber, a chamber, a feeding chamber, a driving chamber, a blowing pipe and an exhaust hole; the chamber pipe is connected to the bottom of the material chamber, the feeding chamber pipe is connected to the bottom of the chamber, the driving chamber is fixedly installed on the left side of the feeding chamber and is interconnected, the blowing pipe is connected to the right side of the feeding chamber, the inner wall of the driving chamber is fixedly installed with a motor, the output end of the motor is fixedly connected with an insertion rod, the bottom of the chamber is connected to the feeding pipe, a screw barrel is provided inside the feeding chamber, the screw barrel is connected to the bottom of the feeding pipe, a screw is provided inside the screw barrel, an insertion barrel is fixed on the left side of the screw, a slot is provided inside the insertion barrel, and the insert rod is inserted into the slot, an extrusion head is fixed at the right end of the screw, and the exhaust hole is opened on one side of the feeding chamber.

[0005] The present invention further describes that a motor is fixed to the inner wall of the driving cavity, a gear is fixedly connected to the output end of the motor, a cylinder is fixed to the outside of the insertion tube, a plurality of gear rings are provided on the outside of the cylinder, and the cylinder is meshed with the gears through the plurality of gear rings.

[0006] The present invention further describes that a plurality of countersunk holes are opened on the right side of the insertion cylinder, and extrusion rods are slidably connected in the countersunk holes, and the outer ends of the extrusion rods are spherical; springs are fixed on the upper and lower inner walls of the feeding cavity, and circular rings are fixed at the inner ends of the two springs. After the extrusion rod moves to the left, it contacts the circular rings.

[0007] The present invention further describes that a slider is fixed to the bottom end of the extrusion rod, and the slider is slidably connected to the countersunk hole, and an air inlet and an air outlet are provided inside the right side of the insertion tube, the air inlet and the air outlet are connected to each other, and the air inlet is connected to the interior of the insertion tube, a baffle is fixed to the inner wall of the insertion tube, an air hole is provided in the middle of the baffle, the left side of the baffle is connected to the external pipeline, and a one-way valve is provided in the pipeline, a pressure valve is provided inside the air inlet, and an electric control valve is provided inside the air outlet.

[0008] The present invention further describes that a material quantity detector is provided inside the chamber, a material monitoring module and a material viscosity module are provided inside the material quantity detector, a time delay module is provided inside the electric control valve, the material monitoring module and the material viscosity module are both electrically connected to the time delay module, the material monitoring module is used to detect the single feeding amount, the material viscosity module is used to detect the viscosity of the material, and the time delay module is used to control the delay time of opening the electric control valve.

[0009] The present invention further illustrates that the delay time for the electric control valve to open is: T is the delay time of opening the electric control valve, T max is the longest delay time for the electric control valve to open, K is the input amount of a single material, K max It is the maximum amount of material input at a time; that is, the more material is input at a time, the longer the delay time for the electric control valve to open.

[0010] The present invention further illustrates that the opening delay time of the electronically controlled valve after one optimization is: T1 is the opening delay time of the electric control valve after one optimization, N is the viscosity of the material, N max is the maximum viscosity of the material; that is, as the viscosity of the material increases, the opening delay time of the electric control valve further increases, and the opening delay time of the electric control valve is optimized.

[0011] The present invention further illustrates that the opening delay time of the electric control valve after secondary optimization is: when N>

[0012] N 系 When N 系 Material viscosity set for the system: T2 is the opening delay time of the electric control valve after secondary optimization; when N≤N 系 hour:

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the blow molding equipment adopted by the present invention is automated in operation, and the shape of the screw is such that two material channels are arranged on the surface, the particle material transmission effect is better, the overall manufacturing cost of the screw is low, and the jamming phenomenon can be avoided. The high-temperature water vapor generated by the particle material can be discharged through the exhaust hole, and at the same time, the insertion barrel drives the screw to move to the left, and the screw drives the extrusion head to move to the left, and the particle material is transmitted to the rightmost side of the blow molding tube. Thereafter, the motor rotates in the opposite direction, causing the extrusion head to move to the right, and the melted material is extruded and molded through the blow molding tube; the rotation of the gear causes the extrusion head to continuously move left and right, and the blow molding is automated in operation, convenient and efficient, and can improve the blow molding efficiency. In addition, the stability of the left and right movement of the extrusion head is improved, the extrusion force can also be guaranteed, and the blow molding quality is greatly improved.

[0014] Vibration can disperse the material to avoid blockage. At the same time, vibration can loosen the material on the screw, which has a better material transmission effect and fully avoids the phenomenon of material transmission jamming, further improving the efficiency of material transmission. When the extrusion rod moves left and right, the extrusion surface of the ring is increased, which increases the deformation of the spring and the subsequent reaction force, thereby greatly improving the vibration intensity, greatly improving the material transmission and blow molding efficiency, and fully avoiding the occurrence of blockage. After that, the electric control valve opens to discharge the gas in the countersunk hole, thereby resetting the extrusion rod. The intermittent high-intensity vibration can, on the one hand, ensure the unblocking of the material, and on the other hand, relatively reduce structural loss, thereby greatly improving the service life of the extrusion rod and the ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 1 is a schematic diagram of the screw structure of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the blow molding equipment of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of the feeding cavity of the present invention;

[0019] Figure 4 The present invention Figure 3 A magnified view of point A in the figure;

[0020] Figure 5 This is a schematic diagram of the internal structure of the insertion tube of the present invention;

[0021] Figure 6 is a plan view of the insertion tube of the present invention;

[0022] In the figure: 1. material cavity; 2. chamber; 21. feed pipe; 3. delivery cavity; 31. screw barrel; 32. insert barrel; 321. cylinder; 322. gear ring; 323. extrusion rod; 324. slider; 325. air inlet; 326. air outlet; 327. baffle; 33. spring; 331. ring; 34. extrusion head; 4. drive cavity; 41. motor; 411. insert barrel; 42. motor; 421. gear; 5. blow molding tube; 6. exhaust hole. DETAILED DESCRIPTION

[0023] The following is a non-limiting detailed description of the technical solutions of the present invention in conjunction with preferred embodiments and the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0024] See also Figures 1-6 The present invention provides a technical solution: a PVA blow molding screw structure, including a PVA blow molding device, the PVA blow molding device includes a material cavity 1, a cavity 2, a feed cavity 3, a drive cavity 4, a blow molding tube 5 and an exhaust hole 6;

[0025] The chamber 2 pipeline is connected to the bottom of the material chamber 1, the feeding chamber 3 pipeline is connected to the bottom of the chamber 2, the driving chamber 4 is fixedly installed on the left side of the feeding chamber 3, and the blowing tube 5 is connected to the right side of the feeding chamber 3. The inner wall of the driving chamber 4 is fixedly installed with a motor 41, and the output end of the motor 41 is fixedly connected to the insertion rod 411. The bottom of the chamber 2 is connected to the feeding pipe 21. The interior of the feeding chamber 3 is provided with a screw barrel 31, the screw barrel 31 is connected to the bottom of the feeding pipe 21, and a screw is provided inside the screw barrel 31. An insertion barrel 32 is fixed on the left side of the screw, and a slot is provided inside the insertion barrel 32, and the insertion rod 411 is inserted into the slot. The right end of the screw is fixed with an extrusion head 34, and the exhaust hole 6 is opened on one side of the feeding chamber 3;

[0026] After the granular material is put into the material cavity 1, the granular material enters the chamber 2 through the pipeline, and then enters the screw barrel 31 through the feed pipe 21, and falls onto the material channel of the screw. Then the motor 41 runs, and the insertion cylinder 32 is driven to rotate by the insertion rod 411, and the insertion cylinder 32 drives the screw to rotate. The screw drives the granular material to be transmitted on its material channel until it is transmitted to the blow molding tube 5. The granular material is then melted and extruded and blow-molded. The operation is automated, and the screw is shaped with two material channels on the surface, which has a better granular material transmission effect, low overall screw manufacturing cost, and can avoid jamming. The high-temperature water vapor generated by the granular material can be discharged through the exhaust hole 6. The shape of the screw facilitates high fluidity of the melt and is more conducive to the stability of the discharge.

[0027] A motor 42 is fixed to the inner wall of the drive chamber 4, and a gear 421 is fixedly connected to the output end of the motor 42. A cylinder 321 is fixed to the outside of the insertion cylinder 32, and a plurality of gear rings 322 are provided on the outside of the cylinder 321, and the gears 421 are meshed with each other through the gear rings 322.

[0028] After the granular material enters the blow molding tube 5 and melts, the motor 42 runs, driving the gear 421 to rotate clockwise, and through the engagement with the gear ring 322, drives the cylinder 321 to move to the left, and the cylinder 321 drives the insertion cylinder 32 to move to the left. The insertion cylinder 32 slides to the left on the outside of the insertion rod 411 through the slot. At the same time, the insertion cylinder 32 drives the screw to move to the left, and the screw drives the extrusion head 34 to move to the left. The granular material is transferred to the rightmost side of the blow molding tube 5. Then, the motor 42 rotates in the opposite direction, causing the extrusion head 34 to move to the right, and the melted material is extruded through the blow molding tube 5.

[0029] The rotation of the gear 421 causes the extrusion head 34 to continuously move left and right, and blow molding is automated, convenient and efficient, which can improve the blow molding efficiency. The stability of the left and right movement of the extrusion head 34 is improved, the extrusion force can also be guaranteed, and the blow molding quality is greatly improved.

[0030] The right side of the insertion tube 32 is provided with a plurality of countersunk holes, each of which is slidably connected to an extrusion rod 323, the outer end of which is spherical;

[0031] Springs 33 are fixed to the upper and lower inner walls of the feeding cavity 3. Rings 331 are fixed to the inner ends of the two springs 33. After the extrusion rod 323 moves to the left, it contacts the rings 331.

[0032] When the insertion cylinder 32 moves left and right, it drives the extrusion rod 323 to move left and right. When the extrusion rod 323 moves to contact with the ring 331 and squeezes each other, the spring 33 is deformed by the force, and then the extrusion rod 323 presses over the ring 331. The spring 33 generates a reaction force, causing the ring 331 to quickly reset, thereby causing the entire feeding cavity 3 to vibrate, which can make the extrusion head 34 shake the material apart by vibration when extruding the material to avoid blockage. At the same time, the vibration can vibrate the material on the screw to loosen it, resulting in a better material transmission effect, fully avoiding the phenomenon of material transmission jamming, and further improving the efficiency of material transmission.

[0033] A slider 324 is fixed to the bottom end of the extrusion rod 323, and the slider 324 is slidably connected to the countersunk hole. An air inlet 325 and an air outlet 326 are provided inside the right side of the insertion tube 32. The air inlet 325 and the air outlet 326 are connected to each other. The air inlet 325 is communicated with the interior of the insertion tube 32. A baffle 327 is fixed to the inner wall of the insertion tube 32. An air hole is provided in the middle of the baffle 327. The left side of the baffle 327 is connected to an external pipeline, and a one-way valve is provided in the pipeline. A pressure valve is provided inside the air inlet 325, and an electric control valve is provided inside the air outlet 326.

[0034] When the insertion cylinder 32 moves left and right, it slides left and right on the outside of the insertion rod 411. At this time, the right end of the insertion rod 411 moves left and right in the slot. The right side of the insertion rod 411 continuously extracts gas from the outside and squeezes the gas to the right side of the baffle 327 through the air hole. When the motor 42 rotates clockwise and counterclockwise and continuously blows the mold, the gas pressure on the right side of the baffle 327 reaches the pressure limit of the pressure valve, causing the pressure valve to open. At this time, the electric control valve is in a closed state. Then, the gas quickly enters the countersunk hole through the air inlet 325. The air pressure pushes the slider 324 to move quickly outward, causing the extrusion rod 323 to move outward. At this time, when the extrusion rod 323 moves left and right, the extrusion surface of the ring 331 increases, which increases the deformation of the spring 33 and the subsequent reaction force. This greatly improves the vibration intensity, greatly improves the material transmission and blow molding efficiency, and fully avoids blockage.

[0035] Then the electric control valve opens to discharge the gas in the countersunk hole, thereby resetting the extrusion rod 323. The intermittent high-intensity vibration can ensure the unblocking of materials on the one hand, and on the other hand can relatively reduce structural loss, thereby greatly improving the service life of the extrusion rod 323 and the ring 331.

[0036] A material quantity detector is provided inside chamber 2, and a material monitoring module and a material viscosity module are provided inside the material quantity detector. A time delay module is provided inside the electric control valve. The material monitoring module and the material viscosity module are electrically connected to the time delay module. The material monitoring module is used to detect the single feeding amount, the material viscosity module is used to detect the viscosity of the material, and the time delay module is used to control the delay time of opening the electric control valve.

[0037] The delay time for the electric control valve to open is: T is the delay time of opening the electric control valve, T max is the longest delay time for the electric control valve to open, K is the input amount of a single material, K max The maximum input amount of a single material;

[0038] That is, the more material is put in at a time, the longer the delay time for the electric control valve to open;

[0039] The more material is input, the more material will be on the right side of the extrusion head 34. At this time, by delaying the opening time of the electric control valve, the time for increasing the vibration intensity after the extrusion rod 323 moves outward will be longer. On the one hand, the vibration time is increased for a large amount of material, so that the material on the right side of the extrusion head 34 can be loosened quickly to improve the efficiency of blow molding. On the other hand, the vibration time is reduced for a small amount of material to avoid loosening between structures affecting the overall service life of the blow molding setting.

[0040] The opening delay time of the electric control valve after one optimization is: T1 is the opening delay time of the electric control valve after one optimization, N is the viscosity of the material, N max is the maximum viscosity of the material;

[0041] That is, as the viscosity of the material increases, the delay time of the opening of the electric control valve further increases, and the delay time of the opening of the electric control valve is optimized;

[0042] As the viscosity of the material increases, the delay time for the electric control valve to open is further increased. The high-viscosity material is more likely to clog the blow molding tube 5, which can greatly reduce the probability of clogging. Conversely, the delay time for the electric control valve to open is shortened to prevent the vibration intensity from being continuously high, thereby protecting the service life of the structure and avoiding the increase in the gap between the screw and the inner wall of the barrel 31, which causes the material to be stuck in the screw.

[0043] The opening delay time of the electric control valve after secondary optimization is:

[0044] When N>N 系 When N 系 Material viscosity set for the system: T2 is the opening delay time of the electric control valve after secondary optimization;

[0045] When N≤N 系 hour:

[0046] When the viscosity of the material is high, the vibration intensity is greatly increased to fully prevent clogging. When the viscosity of the material is low, the vibration intensity is greatly reduced to fully protect the service life of the structure and fully prevent jamming to ensure the normal operation of the blow molding equipment. The efficiency of blow molding can also be relatively greatly improved.

[0047] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0048] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the aforementioned embodiments, or that some of the technical features may be replaced with equivalents. Such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A PVA blow molding screw structure, including a PVA blow molding device, characterized in that: The PVA blow molding equipment comprises a material cavity (1), a chamber (2), a feed cavity (3), a drive cavity (4), a blow molding pipe (5) and an exhaust hole (6); the chamber (2) pipeline is connected to the bottom of the material cavity (1), the feed cavity (3) pipeline is connected to the bottom of the chamber (2), the drive cavity (4) is fixedly installed on the left side of the feed cavity (3) and is interconnected, the blow molding pipe (5) is connected to the right side of the feed cavity (3), an electric motor (41) is fixedly installed on the inner wall of the drive cavity (4), an insertion rod (411) is fixedly connected to the output end of the electric motor (41), and a feed pipe (211) is connected to the bottom of the chamber (2). 1), a screw barrel (31) is provided inside the feeding chamber (3), the screw barrel (31) is connected to the bottom of the feeding pipe (21), a screw rod is provided inside the screw barrel (31), an insert barrel (32) is fixed on the left side of the screw rod, a slot is provided inside the insert barrel (32), and an insert rod (411) is inserted into the slot, an extrusion head (34) is fixed on the right end of the screw rod, and the exhaust hole (6) is opened on one side of the feeding chamber (3); a motor (42) is fixed on the inner wall of the driving chamber (4), a gear (421) is fixed to the output end of the motor (42), and a gear (421) is fixed on the outer side of the insert barrel (32). The cylinder (321) is provided with a plurality of toothed rings (322) on the outside of the cylinder (321), and the plurality of toothed rings (322) are meshed with the gear (421); a plurality of countersunk holes are provided on the right side of the insertion cylinder (32), and extrusion rods (323) are slidably connected in the countersunk holes, and the outer ends of the extrusion rods (323) are spherical; springs (33) are fixed on the upper and lower inner walls of the feeding cavity (3), and circular rings (331) are fixed on the inner ends of the two springs (33), and the extrusion rods (323) contact the circular rings (331) after moving to the left; a slider (324) is fixed on the bottom end of the extrusion rod (323) , and the slider (324) is slidably connected in the countersunk hole, an air inlet (325) and an air outlet (326) are provided inside the right side of the insertion tube (32), the air inlet (325) and the air outlet (326) are connected to each other, the air inlet (325) is communicated with the interior of the insertion tube (32), a baffle (327) is fixed to the inner wall of the insertion tube (32), an air hole is provided in the middle of the baffle (327), the left side of the baffle (327) is connected to the external pipeline, and a one-way valve is provided in the pipeline, a pressure valve is provided inside the air inlet (325), and an electric control valve is provided inside the air outlet (326).

2. A PVA blow molding screw structure according to claim 1, characterized in that: A material quantity detector is provided inside the chamber (2), a material monitoring module and a material viscosity module are provided inside the material quantity detector, a time delay module is provided inside the electric control valve, the material monitoring module and the material viscosity module are both electrically connected to the time delay module, the material monitoring module is used to detect a single feeding amount, the material viscosity module is used to detect the viscosity of the material, and the time delay module is used to control the delay time of opening the electric control valve.

3. A PVA blow molding screw structure according to claim 2, characterized in that: The delay time for the electric control valve to open is: , T is the delay time of the electric control valve opening, T max is the longest delay time for the electric control valve to open, K is the input amount of a single material, K max It is the maximum amount of material input at a time; that is, the more material is input at a time, the longer the delay time for the electric control valve to open.

4. A PVA blow molding screw structure according to claim 3, characterized in that: The opening delay time of the electric control valve after one optimization is: , T1 is the opening delay time of the electric control valve after one optimization, N is the viscosity of the material, N max is the maximum viscosity of the material; that is, as the viscosity of the material increases, the opening delay time of the electric control valve further increases, and the opening delay time of the electric control valve is optimized.

5. A PVA blow molding screw structure according to claim 4, characterized in that: The opening delay time of the electric control valve after secondary optimization is: When N>N 系 When N 系 Material viscosity set for the system: , T2 is the opening delay time of the electric control valve after secondary optimization; When N≤N 系 hour: .

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