PVA blow molding screw structure

Abstract

The invention belongs to the technical field of PVA blow molding screws, and particularly relates to a PVA blow molding screw structure which comprises PVA blow molding equipment, and the PVA blow molding equipment comprises a material cavity, a cavity, a material conveying cavity, a driving cavity, a blow molding pipe and an exhaust hole; the cavity is connected to the lower portion of the material cavity through a pipeline, the material conveying cavity is connected to the lower portion of the cavity through a pipeline, the driving cavity is fixedly installed on the left side of the material conveying cavity and is communicated with the material conveying cavity, the blow molding pipe is connected to the right side of the material conveying cavity, a motor is fixedly installed on the inner wall of the driving cavity, and the output end of the motor is fixedly connected with an insertion rod. The bottom of the cavity is connected with a feeding pipe, a screw barrel is arranged in the material conveying cavity, the screw barrel is connected to the bottom of the feeding pipe, and a screw rod is arranged in the screw barrel, the device solves the problems that an existing PVA blow molding screw rod is prone to blockage and not easy to dredge during blow molding, meanwhile, high fluidity of a solution is facilitated, and discharging stability is better facilitated.

Description

Technical Field

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

[0002] The screw of a blow molding machine is mainly composed of a rod body, screw fins, and spiral grooves. The rod body is the main body of the screw and is usually made of high-strength materials to withstand the high temperature and high pressure during the plastic melting process. The screw fins and spiral grooves push the plastic particles forward when the screw rotates, and gradually melt the plastic through shear force and mutual friction between the plastics. As the screw rotates continuously, the molten plastic is further mixed and homogenized, and finally transported to the mold for blow molding. During blow molding, the high-temperature molten material accumulates too much and blocks the blow molding tube. This phenomenon has become a problem that people in this field need to solve urgently. 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 cavity, a chamber, a feed cavity, a drive cavity, a blow molding tube and an exhaust hole; the chamber pipeline is connected to the bottom of the material cavity, the feed cavity pipeline is connected to the bottom of the chamber, the drive cavity is fixedly installed on the left side of the feed cavity and are interconnected, the blow molding tube is connected to the right side of the feed cavity, a motor is fixedly installed on the inner wall of the drive cavity, an insertion rod is fixedly connected to the output end of the motor, a feed pipe is connected to the bottom of the chamber, a screw barrel is arranged inside the feed cavity, the screw barrel is connected to the bottom of the feed pipe, a screw is arranged inside the screw barrel, an insertion barrel is fixed on the left side of the screw, a slot is arranged inside the insertion barrel, and the insertion 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 feed cavity.

[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 arranged 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 tube, 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 on the inner ends of the two springs, and the extrusion rods contact the circular rings after moving to the left.

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

[0008] The present invention further describes that a material quantity detector is arranged inside the chamber, a material monitoring module and a material viscosity module are arranged inside the material quantity detector, a time delay module is arranged 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 feed 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 for opening the electric control valve.

[0009] The present invention further illustrates that the delay time for the opening of the electric control valve 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 will be.

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

[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]

[0014] 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 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 tube 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, and then the motor rotates in the opposite direction, so that the extrusion head moves to the right, and the melted material is extruded through the blow molding tube; the extrusion head is continuously moved left and right through the rotation of the gear, and the blow molding is automated in operation, convenient and efficient, and the blow molding efficiency can be improved. 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;

[0015] Vibration is used to disperse the material to avoid blockage. At the same time, vibration can vibrate the material on the screw to loosen it, so that the material transmission effect is better, and the phenomenon of material transmission jamming is fully avoided, further improving the efficiency of material transmission. When the extrusion rod moves left and right, the extrusion surface of the ring is increased, the deformation degree of the spring is increased, and the subsequent reaction force is increased, so that the vibration intensity is greatly improved, and the material transmission and blow molding efficiency are greatly improved, and blockage is fully avoided. After that, the electric control valve opens to discharge the gas in the counterbore, so that the extrusion rod is reset. The intermittent high-intensity vibration can ensure the unblocking of the material on the one hand, and can relatively reduce the structural loss on the other hand, so that the service life of the extrusion rod and the ring is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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:

[0017] Figure 1 It is a schematic diagram of the screw structure of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the blow molding equipment of the present invention;

[0019] Figure 3 It is a schematic diagram of the internal structure of the feeding cavity of the present invention;

[0020] Figure 4 The present invention Figure 3 A in the enlarged view;

[0021] Figure 5 It is a schematic diagram of the internal structure of the insertion tube of the present invention;

[0022] Figure 6 is a plan view of the insertion tube of the present invention;

[0023] In the figure: 1. material cavity; 2. chamber; 21. feed pipe; 3. delivery cavity; 31. screw barrel; 32. insertion 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. insertion rod; 42. motor; 421. gear; 5. blow molding tube; 6. exhaust hole. DETAILED DESCRIPTION

[0024] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 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;

[0026] The pipe of chamber 2 is connected to the bottom of material chamber 1, the pipe of feeding chamber 3 is connected to the bottom of chamber 2, the driving chamber 4 is fixedly installed on the left side of feeding chamber 3 and is interconnected, the blow molding tube 5 is connected to the right side of feeding chamber 3, the inner wall of driving chamber 4 is fixedly installed with motor 41, the output end of motor 41 is fixedly connected with insertion rod 411, the bottom of chamber 2 is connected with feeding pipe 21, the inside of feeding chamber 3 is provided with screw barrel 31, screw barrel 31 is connected to the bottom of feeding pipe 21, the inside of screw barrel 31 is provided with screw, the left side of screw is fixed with insertion barrel 32, the inside of insertion barrel 32 is provided with slot, and insertion rod 411 is inserted into the slot, the right end of screw is fixed with extrusion head 34, and exhaust hole 6 is opened on one side of feeding chamber 3;

[0027] After the granular material is put into the material chamber 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 on the material channel of the screw. Then the motor 41 starts to operate, and the insertion barrel 32 is driven to rotate through the insertion rod 411, and the insertion barrel 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. Then the granular material is melted and extruded and blow-molded. The operation is automated, and the screw is shaped in such a way that two material channels are arranged on the surface, so the granular 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 granular material can be discharged through the exhaust hole 6. The shape of the screw facilitates the high fluidity of the melt and is more conducive to the stability of the discharge.

[0028] A motor 42 is fixed to the inner wall of the driving chamber 4, and a gear 421 is fixedly connected to the output end of the motor 42. A cylinder 321 is fixed to the outer side of the insertion cylinder 32, and a plurality of toothed rings 322 are arranged on the outer side of the cylinder 321, and the plurality of toothed rings 322 mesh with the gear 421.

[0029] After the granular material enters the blow molding tube 5 and melts, the motor 42 runs, driving the gear 421 to rotate clockwise, and drives the cylinder 321 to move to the left through the meshing with the gear ring 322, and the cylinder 321 drives the insertion cylinder 32 to move to the left, and the insertion cylinder 32 slides to the left on the outside of the insertion rod 411 through the slot, and 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, and the granular material is transferred to the rightmost side of the blow molding tube 5, and then the motor 42 rotates in the opposite direction, so that the extrusion head 34 moves to the right, and the melted material is extruded through the blow molding tube 5;

[0030] 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.

[0031] A plurality of countersunk holes are provided on the right side of the insertion tube 32, and extrusion rods 323 are slidably connected in the countersunk holes, and the outer ends of the extrusion rods 323 are spherical;

[0032] 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. After the extrusion rod 323 moves to the left, it contacts the circular ring 331.

[0033] When the insertion tube 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, so that the ring 331 quickly resets, thereby causing the entire feeding chamber 3 to vibrate. When the extrusion head 34 extrudes the material, the vibration can disperse the material to avoid blockage. At the same time, the vibration can vibrate the material on the screw to loosen it, so that the material transmission effect is better, and the phenomenon of material transmission jamming is fully avoided, thereby further improving the efficiency of material transmission.

[0034] A slider 324 is fixed to the bottom end of the extrusion rod 323, and the slider 324 is slidably connected in the counterbore. 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 inside 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.

[0035] When the insertion tube 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 alternately and continuously blows and molds, the gas pressure on the right side of the baffle 327 reaches the pressure bearing 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 counterbore 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, causing the deformation degree of the spring 33 to increase, and the subsequent reaction force increases, thereby greatly improving the vibration intensity, and the material transmission and blow molding efficiency are greatly improved, and the blockage phenomenon is fully avoided.

[0036] Then the electric control valve opens to discharge the gas in the counterbore, thereby resetting the extrusion rod 323. The intermittent high-intensity vibration can ensure the unblocking of materials on the one hand, and can relatively reduce structural loss on the other hand, thereby greatly improving the service life of the extrusion rod 323 and the ring 331.

[0037] A material quantity detector is arranged inside the chamber 2, and a material monitoring module and a material viscosity module are arranged inside the material quantity detector. A time delay module is arranged 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 for opening the electric control valve.

[0038] 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 The maximum input amount of a single material;

[0039] That is, the more material is put in at a time, the longer the delay time of the electric control valve opening will be;

[0040] The more material is input, the more material is 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 is 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.

[0041] The opening delay time of the electric control valve after one optimization is: T1 is the delay time of opening of the electric control valve after optimization, N is the viscosity of the material, N max is the maximum viscosity of the material;

[0042] That is, when 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;

[0043] As the viscosity of the material increases, the delay time for the opening of the electric control valve is further increased. High-viscosity materials are more likely to clog the blow molding tube 5, which can greatly reduce the probability of clogging. Conversely, the delay time for the opening of the electric control valve is shortened to prevent the vibration intensity from being continuously high, thereby protecting the service life of the structure and preventing the gap between the screw and the inner wall of the barrel 31 from increasing, causing the material to be stuck in the screw.

[0044] The opening delay time of the electric control valve after secondary optimization is:

[0045] When N>N 系 When N 系 Material viscosity set for the system:

[0046] T2 is the opening delay time of the electric control valve after secondary optimization;

[0047] When N≤N 系 hour:

[0048] 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.

[0049] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc. indicate directions or positional relationships 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 cannot be understood as a limitation on the present invention.

[0050] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the 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 material delivery cavity (3), a drive cavity (4), a blow molding tube (5) and an exhaust hole (6); The chamber (2) pipeline is connected to the bottom of the material chamber (1), the feed chamber (3) pipeline is connected to the bottom of the chamber (2), the drive chamber (4) is fixedly installed on the left side of the feed chamber (3) and is interconnected, the blow molding tube (5) is connected to the right side of the feed chamber (3), an electric motor (41) is fixedly installed on the inner wall of the drive chamber (4), an insertion rod (411) is fixedly connected to the output end of the electric motor (41), and the bottom of the chamber (2) is connected to A feed pipe (21), a screw barrel (31) is arranged inside the feed cavity (3), the screw barrel (31) is connected to the bottom of the feed pipe (21), a screw rod is arranged inside the screw barrel (31), an insertion barrel (32) is fixed on the left side of the screw rod, a slot is arranged inside the insertion barrel (32), and an insertion rod (411) is inserted into the slot, an extrusion head (34) is fixed at the right end of the screw rod, and the exhaust hole (6) is opened on one side of the feed cavity (3).

2. A PVA blow molding screw structure according to claim 1, characterized in that: A motor (42) is fixed to the inner wall of the driving cavity (4), a gear (421) is fixedly connected to the output end of the motor (42), a cylinder (321) is fixed to the outer side of the insertion cylinder (32), a plurality of toothed rings (322) are arranged on the outer side of the cylinder (321), and the plurality of toothed rings (322) are meshed with the gear (421).

3. A PVA blow molding screw structure according to claim 2, characterized in that: A plurality of countersunk holes are provided on the right side of the insertion tube (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). After the extrusion rod (323) moves to the left, it contacts the circular ring (331).

4. A PVA blow molding screw structure according to claim 3, characterized in that: A slider (324) is fixed to 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 arranged 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 arranged 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 arranged in the pipeline. A pressure valve is arranged inside the air inlet (325), and an electric control valve is arranged inside the air outlet (326).

5. A PVA blow molding screw structure according to claim 4, characterized in that: The chamber (2) is provided with a material quantity detector inside, the material quantity detector is provided with a material monitoring module and a material viscosity module inside, the electric control valve is provided with a time delay module inside, 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.

6. A PVA blow molding screw structure according to claim 5, characterized in that: The delay time of the opening of the electric control valve 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 The maximum input amount of a single material; That is, the more material is put in at a time, the longer the delay time for the electric control valve to open will be.

7. A PVA blow molding screw structure according to claim 6, characterized in that: The opening delay time of the electric control valve after one optimization is: T1 is the delay time of opening of the electric control valve after optimization, N is the viscosity of the material, N max is the maximum viscosity of the material; That is, when 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.

8. A PVA blow molding screw structure according to claim 7, 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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