Production process of special polyvinyl chloride particles for steam sterilization

Abstract

The invention belongs to the technical field of polyvinyl chloride particle production, and particularly relates to a production process of special polyvinyl chloride particles for steam sterilization, which comprises the following steps: step 1, feeding polyvinyl chloride particles into a charging barrel through a feeding pipe; secondly, an air exhaust mechanism is started, hot air emitted by the polyvinyl chloride particles is exhausted through an air exhaust plate, and the hot air sequentially passes through a second shell, a first shell and a cooling pipe and is finally exhausted through an air exhaust pipe; thirdly, a driving motor is started, the driving motor drives a rotating shaft to rotate, when the rotating shaft rotates, a first shell is driven to rotate intermittently, when the first shell rotates, an air suction barrel is driven to rotate, and through cooperation of the air suction barrel and an air suction plate, hot air in the material barrel is pumped out; the cooling pipe is arranged in the charging barrel, the cooling pipe is provided with the multiple heat dissipation mechanisms in the length direction of the cooling pipe, hot air in the charging barrel can be pumped out through the heat dissipation mechanisms, flowing of airflow is improved, and the cooling rate of polyvinyl chloride particles is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of polyvinyl chloride production, and particularly relates to a production process for polyvinyl chloride particles dedicated to steam sterilization. Background Art

[0002] Polyvinyl chloride is a thermoplastic resin obtained by polymerizing ethylene. Polyvinyl chloride is odorless, non-toxic, feels like wax, has excellent low-temperature resistance, good chemical stability, and can resist the erosion of most acids and alkalis (it is not resistant to acids with oxidative properties). It is insoluble in common solvents at room temperature, has low water absorption, and excellent electrical insulation. Polyvinyl chloride is a typical thermoplastic plastic, a colorless, odorless, non-toxic, combustible white powder. The polyvinyl chloride for molding processing is all wax-like pellet materials obtained by extrusion granulation, and the appearance is milky white. Those with a molecular weight exceeding 100,000 are ultra-high molecular weight polyvinyl chloride. The higher the molecular weight, the better its physical and mechanical properties, and the closer it is to the requirements of engineering materials.

[0003] The plastic strip is extruded at a high temperature. After the plastic strip is cooled and formed and dried, it is driven by a transmission plate and a pressure roller to approach a granulator for granulation. Since the plastic strip is heated and melted and then extruded, the temperature of the plastic particles after granulation is still relatively high. The current homogenization device relies on natural cooling to reduce the temperature. The temperature of the material before entering the homogenization device is about 80°C, and it takes more than 4 hours to cool to room temperature. However, in the production process, packaging must be carried out every 0.5 hours, which cannot meet the production needs. The particles are stacked together and the heat dissipation is slow. Moreover, there is still a certain amount of moisture in the pellet material that has not volatilized completely. After directly flowing into the homogenization device, it is difficult to dissipate the heat and moisture. In subsequent homogenization, packaging and storage, the material temperature will be too high and the moisture will be too heavy. Directly homogenizing and packaging a large amount of materials for storage easily causes yellowing of the materials or loss of mechanical properties, resulting in uneven product quality. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a production process for polyvinyl chloride particles dedicated to steam sterilization. By providing a cooling pipe and a heat dissipation mechanism in the barrel, the hot air emitted by the polyvinyl chloride particles in the barrel can be extracted, accelerating the cooling of the polyvinyl chloride particles, overcoming the deficiencies of the prior art, and aiming to solve the problems in the background art.

[0005] To achieve the above technical purpose, the specific technical solution of the present invention is as follows. A production process for polyvinyl chloride particles dedicated to steam sterilization proposed by the present invention includes the following steps: Step 1: Polyvinyl chloride particles are fed into the barrel through a feed pipe; Step 2: Start the air extraction mechanism, extract the hot air emitted by the polyvinyl chloride particles through an air extraction plate. The hot air sequentially passes through a second housing, a first housing, and a cooling pipe, and finally the hot air is discharged through an air extraction pipe; Step 3: Start the drive motor. The drive motor drives the rotating shaft to rotate. When the rotating shaft rotates, it drives the first housing to rotate intermittently. When the first housing rotates, it drives the air extraction cylinder to rotate. Through the cooperation of the air extraction cylinder and the air extraction plate, the hot air in the material cylinder is extracted. Wherein, a feed pipe is connected above the material cylinder, and a discharge pipe is fixedly connected to the bottom of the material cylinder; a cooling pipe is vertically arranged in the material cylinder, the upper and lower ends of the cooling pipe are closed, a suction pipe is fixedly connected to the lower end of the cooling pipe, one end of the suction pipe extends to the outside of the material cylinder, and an air extraction mechanism is installed on the suction pipe; a plurality of heat dissipation mechanisms are connected to the cooling pipe, and the heat dissipation mechanisms are evenly distributed along the height direction of the cooling pipe. The heat dissipation mechanism includes a first housing and a second housing with an annular structure. The first housing is hermetically and rotatably connected to the surface of the cooling pipe, and the first housing is communicated with the inside of the cooling pipe. The second housing is arranged outside the first housing, the second housing is rotatably connected to the first housing, and the second housing is fixedly connected to the cooling pipe; a plurality of air extraction plates are fixedly connected to both the upper and lower surfaces of the second housing, the air extraction plates are evenly arranged along the circumferential direction of the second housing, the air extraction plates are used to extract the hot air in the material cylinder, and a plurality of air holes are arranged on the surface of the air extraction plates.

[0006] As a preferred technical solution of the present invention, a plurality of rotatable air extraction cylinders are connected to the circumferential surface of the first housing. The air extraction cylinders are arranged inside the second housing. The air extraction cylinders are used to extract the hot air in the second housing, and a first through hole is arranged on the surface of the air extraction cylinders. A second through hole matched with the first through hole is arranged on the second housing, and the second through hole is communicated with the inside of the air extraction plate.

[0007] As a preferred technical solution of the present invention, a drive motor is installed on the cooling pipe. A rotating shaft is connected to the drive motor, and a plurality of incomplete center gears corresponding to the heat dissipation mechanisms one by one are fixedly connected to the rotating shaft.

[0008] As a preferred technical solution of the present invention, an internal gear ring corresponding to the incomplete center gear one by one is fixedly connected to the first housing. A planetary gear meshing with the incomplete center gear and the internal gear ring is installed on the inner wall of the cooling pipe. When the rotating shaft rotates, it drives the first housing to rotate intermittently.

[0009] As a preferred technical solution of the present invention, a complete bevel gear is fixedly connected to the air extraction cylinder, and an incomplete bevel gear meshing with the complete bevel gear is fixedly connected inside the cooling pipe. When the first housing rotates, it drives the air extraction cylinder to rotate intermittently.

[0010] As a preferred technical solution of the present invention, a rotating disk is coaxially fixedly connected to the air extraction cylinder, and a plurality of stirring blades are fixedly connected to the rotating disk for stirring the polyvinyl chloride particles in the material cylinder.

[0011] As a preferred technical solution of the present invention, the second housing is provided with an upper and lower two-layer structure, and a sealing strip is fixedly connected to the air extraction cylinder, and the sealing strip is hermetically connected between the upper and lower two layers of the second housing.

[0012] As a preferred technical solution of the present invention, the diameter of the air hole is smaller than the diameter of the polyvinyl chloride particles.

[0013] The beneficial effects in the present invention are as follows: 1. In the present invention, by providing a cooling pipe in the material cylinder, and a plurality of heat dissipation mechanisms are provided along the length direction of the cooling pipe, the hot air in the material cylinder can be extracted through the heat dissipation mechanisms, improving the air flow and accelerating the cooling rate of the polyvinyl chloride particles.

[0014] 2. The heat dissipation mechanism of the present invention is provided with a first housing and a second housing. When the rotating shaft rotates, it can drive the first housing to rotate. When the first housing rotates, it drives the air extraction cylinder to rotate, and the air extraction cylinder extracts the hot air in the second housing. And when the first through hole on the air extraction cylinder coincides with the second through hole on the second housing, the first housing and the air extraction cylinder pause, so that the air extraction cylinder can be completely communicated with the air extraction plate, thereby instantly increasing the air extraction force of the air extraction plate and achieving the purpose of better extracting the hot air.

[0015] 3. In the present invention, while the air extraction cylinder is moving, it can drive the stirring blades to rotate, and the stirring blades stir the polyvinyl chloride particles. Thus, while the air extraction plate is extracting air, the stirring blades can drive the vinyl chloride particles to flow in the material cylinder, changing the relative distance between the vinyl chloride particles and the air extraction plate, and thus enabling the vinyl chloride particles to dissipate heat evenly. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of a production device for steam sterilization special polyvinyl chloride particles proposed by the present invention.

[0017] Figure 2 It is a cross-sectional schematic diagram of a production device for steam sterilization special polyvinyl chloride particles proposed by the present invention.

[0018] Figure 3 It is a schematic diagram of the cooling pipe and the heat dissipation mechanism proposed by the present invention.

[0019] Figure 4 It is Figure 3 a partial structural schematic diagram of

[0020] Figure 5 It is a structural schematic diagram of the heat dissipation mechanism proposed by the present invention.

[0021] Figure 6 It is a cross-sectional schematic diagram of the heat dissipation mechanism proposed by the present invention.

[0022] In the figure: 1. Barrel; 101. Feed pipe; 102. Discharge pipe; 2. Cooling pipe; 201. Air extraction pipe; 202. Air extraction mechanism; 3. Heat dissipation mechanism; 31. First housing; 32. Second housing; 33. Air extraction plate; 331. Air hole; 34. Internal gear ring; 35. Air extraction cylinder; 36. First through hole; 37. Second through hole; 38. Complete bevel gear; 39. Rotating disk; 310. Stirring blade; 311. Sealing strip; 4. Driving motor; 401. Rotating shaft; 402. Incomplete center gear; 5. Incomplete bevel gear; 6. Planet gear. Detailed implementation method

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described 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.

[0024] Embodiment: This embodiment discloses a production process for polyvinyl chloride particles dedicated to steam sterilization, including the following steps: Step 1: Polyvinyl chloride particles are fed into the barrel 1 through the feed pipe 101. Step 2: Start the air extraction mechanism 202, and extract the hot air emitted by the polyvinyl chloride particles through the air extraction plate 33. The hot air sequentially passes through the second housing 32, the first housing 31, and the cooling pipe 2, and finally the hot air is discharged through the air extraction pipe 201. Step 3: Start the driving motor 4. The driving motor 4 drives the rotating shaft 401 to rotate. When the rotating shaft 401 rotates, it drives the first housing 31 to rotate intermittently. When the first housing 31 rotates, it drives the air extraction cylinder 35 to rotate. Through the cooperation of the air extraction cylinder 35 and the air extraction plate 33, the hot air in the barrel 1 is extracted. Among them, as Figures 1 - 6 shown, the production equipment adopted by the above process includes: a barrel 1, the upper end of the barrel 1 is open and the lower end is closed. The feed pipe 101 is connected above the barrel 1. The discharge pipe 102 is fixedly connected to the bottom of the barrel 1. A valve is provided on the discharge pipe 102 to facilitate the control of the discharge of polyvinyl chloride particles. A cooling pipe 2 is vertically arranged in the barrel 1. The cooling pipe 2 is fixedly connected to the middle position of the barrel 1. The upper and lower ends of the cooling pipe 2 are closed. The lower end of the cooling pipe 2 is fixedly connected with an air extraction pipe 201. One end of the air extraction pipe 201 extends to the outside of the barrel 1, and an air extraction mechanism 202 is installed on the air extraction pipe 201 to extract the air in the cooling pipe 2. Among them, a plurality of heat dissipation mechanisms 3 are connected to the cooling pipe 2, and the heat dissipation mechanisms 3 are evenly distributed along the height direction of the cooling pipe 2.

[0025] As Figures 5 - 6As shown in the figure, the heat dissipation mechanism 3 includes a first housing 31 and a second housing 32 with an annular structure. The first housing 31 is sealingly and rotatably connected to the surface of the cooling pipe 2, and the first housing 31 is in internal communication with the cooling pipe 2. The second housing 32 is arranged outside the first housing 31. The second housing 32 is rotatably connected to the first housing 31 and is fixedly connected to the cooling pipe 2. The first housing 31 can rotate circumferentially on the surface of the cooling pipe 2, while the second housing 32 remains stationary. A plurality of air extraction plates 33 are fixedly connected to both the upper and lower surfaces of the second housing 32. The air extraction plates 33 are evenly arranged along the circumferential direction of the second housing 32. The air extraction plates 33 are in an L-shaped structure and extend towards the inner wall of the barrel 1, facilitating the extraction of hot air at different positions inside the barrel 1. A number of air holes 331 are provided on the surface of the air extraction plates 33, and the diameter of the air holes 331 is smaller than the diameter of the polyvinyl chloride particles, preventing the polyvinyl chloride particles from entering the inside of the air extraction plates 33.

[0026] Among them, a plurality of rotatable air extraction cylinders 35 are connected to the circumferential surface of the first housing 31. The air extraction cylinders 35 are arranged inside the second housing 32 and are used to extract the hot air inside the second housing 32. A first through hole 36 is provided on the surface of the air extraction cylinders 35, and a second through hole 37 cooperating with the first through hole 36 is provided on the second housing 32. The second through hole 37 is in internal communication with the inside of the air extraction plates 33. The hot air enters the second housing 32 through the air extraction plates 33. When the first housing 31 rotates circumferentially, it drives the air extraction cylinders 35 to move inside the second housing 32, and the air extraction cylinders 35 extract the hot air inside the second housing 32. Moreover, when the second housing 32 rotates, it can drive the air extraction cylinders 35 to rotate. When the first through hole 36 on the air extraction cylinders 35 coincides with the second through hole 37 on the second housing 32, the air extraction force of the air extraction plates 33 can be increased, thereby instantaneously increasing the air flow inside the air extraction plates 33 and facilitating the extraction of the hot air inside the barrel 1.

[0027] As Figures 3 - 4 shown in the figure, a driving motor 4 is installed on the cooling pipe 2. A rotating shaft 401 is connected to the driving motor 4, and a plurality of incomplete center gears 402 corresponding to the heat dissipation mechanism 3 one by one are fixedly connected to the rotating shaft 401. An internal gear ring 34 corresponding to the incomplete center gears 402 one by one is fixedly connected to the first housing 31. A planetary gear 6 meshing with the incomplete center gears 402 and the internal gear ring 34 is installed on the inner wall of the cooling pipe 2. The planetary gear 6 is arranged between the incomplete center gears 402 and the internal gear ring 34, and there can be a plurality of planetary gears 6. When the rotating shaft 401 rotates, it drives the incomplete center gears 402 to rotate. When the incomplete center gears 402 rotate, they intermittently drive the first housing 31 to rotate. When the first housing 31 rotates circumferentially, it drives the air extraction cylinders 35 to move inside the second housing 32. When the air extraction cylinders 35 just move to the position corresponding to the air extraction plates 33, the first housing 31 will stop moving for about 1 second, enabling the air extraction cylinders 35 and the air extraction plates 33 to have time to cooperate in air extraction.

[0028] Preferably, the air extraction cylinder 35 is fixedly connected with a complete bevel gear 38, and an incomplete bevel gear 5 meshing with the complete bevel gear 38 is fixedly connected inside the cooling pipe 2. When the first housing 31 rotates, it drives the air extraction cylinder 35 to rotate intermittently; when the first housing 31 rotates, the incomplete bevel gear 5 drives the complete bevel gear 38 to rotate intermittently, thereby driving the air extraction cylinder 35 to rotate intermittently by itself. The purpose of this design is that when the first through hole 36 on the air extraction cylinder 35 coincides with the second through hole 37 on the second housing 32, the air extraction cylinder 35 temporarily stops rotating by itself, increasing the cooperation time between the air extraction cylinder 35 and the air extraction plate 33. And as the first housing 31 continues to rotate, the air extraction cylinder 35 separates from the air extraction plate 33, and the air extraction cylinder 35 continues to rotate by itself to extract the hot air inside the second housing 32.

[0029] Preferably, a rotating disk 39 is coaxially and fixedly connected to the air extraction cylinder 35. The rotating disk 39 is arranged outside the second housing 32, and a plurality of stirring blades 310 are fixedly connected to the rotating disk 39 for stirring the polyvinyl chloride particles in the barrel 1. Among them, the second housing 32 is provided with an upper and lower two-layer structure, and a sealing strip 311 is fixedly connected to the air extraction cylinder 35. The sealing strip 311 is sealingly connected between the upper and lower two layers of the second housing 32; when the first housing 31 rotates, it drives the air extraction cylinder 35 to revolve and rotate by itself. When the air extraction cylinder 35 rotates by itself, it drives the stirring blades 310 to rotate, so that the polyvinyl chloride particles in the barrel 1 can flow, changing the position of the polyvinyl chloride particles and enabling the hot air to be evenly dispersed in the barrel 1. And when the air extraction cylinder 35 revolves, it drives the sealing strip 311 to move together to ensure the sealing performance of the second housing 32.

[0030] Working principle of the heat dissipation mechanism: The air extraction mechanism 202 extracts the air inside the cooling pipe 2 outwards, making the inside of the cooling pipe 2 in a negative pressure state. The hot air emitted by the polyvinyl chloride particles in the barrel 1 sequentially passes through the air extraction plate 33, the second housing 32, the air extraction cylinder 35 and the first housing 31 and enters the cooling pipe 2, and the new air enters the barrel 1 through the upper end of the barrel 1; at the same time, the driving motor 4 drives the rotating shaft 401 to rotate. When the rotating shaft 401 rotates, it drives the first housing 31 to rotate intermittently. When the first housing 31 rotates, it drives the air extraction cylinder 35 to revolve and rotate by itself. When the air extraction cylinder 35 moves to a position corresponding to the air extraction plate 33, and at this time the first through hole 36 and the second through hole 37 just coincide, at this time the first housing 31 and the air extraction cylinder 35 temporarily stop rotating for about 1 second, so that the air extraction cylinder 35 and the air extraction plate 33 can have time to cooperate in air extraction, instantaneously increasing the air flow speed inside the air extraction plate 33 and extracting the hot air inside the barrel 1. While the air extraction cylinder 35 rotates by itself, it drives the stirring blades 310 to rotate, so that the polyvinyl chloride particles in the barrel 1 can flow, changing the position of the polyvinyl chloride particles, and enabling the hot air to be evenly dispersed in the barrel 1. At the same time, it speeds up the entry of new air between the polyvinyl chloride particles. The air extraction plate 33 can evenly extract the hot air inside the barrel 1, accelerating the cooling rate of the polyvinyl chloride particles.

[0031] Finally, it should be noted that: in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0032] The above are only the preferred embodiments of the present invention, and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A production process of polyvinyl chloride particles for special steam sterilization, characterized in that, It includes the following steps: Step 1: Polyvinyl chloride particles are fed into the barrel (1) through the feed pipe (101). Step 2: Start the air extraction mechanism (202), and extract the hot air emitted by the polyvinyl chloride particles through the air extraction plate (33). The hot air sequentially passes through the second housing (32), the first housing (31) and the cooling pipe (2), and finally the hot air is discharged through the air extraction pipe (201). Step 3: Start the driving motor (4). The driving motor (4) drives the rotating shaft (401) to rotate. When the rotating shaft (401) rotates, it drives the first housing (31) to rotate intermittently. When the first housing (31) rotates, it drives the air extraction cylinder (35) to rotate. Through the cooperation of the air extraction cylinder (35) and the air extraction plate (33), the hot air in the barrel (1) is extracted. Among them, a feed pipe (101) is connected above the barrel (1), and a discharge pipe (102) is fixedly connected to the bottom of the barrel (1). A cooling pipe (2) is vertically arranged in the barrel (1). The upper and lower ends of the cooling pipe (2) are closed. The lower end of the cooling pipe (2) is fixedly connected with an air extraction pipe (201). One end of the air extraction pipe (201) extends to the outside of the barrel (1), and an air extraction mechanism (202) is installed on the air extraction pipe (201). A plurality of heat dissipation mechanisms (3) are connected to the cooling pipe (2), and the heat dissipation mechanisms (3) are evenly distributed along the height direction of the cooling pipe (2). The heat dissipation mechanism (3) includes a first housing (31) and a second housing (32) with an annular structure. The first housing (31) is hermetically and rotatably connected to the surface of the cooling pipe (2), and the first housing (31) is communicated with the inside of the cooling pipe (2). The second housing (32) is arranged outside the first housing (31). The second housing (32) is rotatably connected to the first housing (31), and the second housing (32) is fixedly connected to the cooling pipe (2). A plurality of air extraction plates (33) are fixedly connected to the upper and lower surfaces of the second housing (32). The air extraction plates (33) are evenly arranged along the circumferential direction of the second housing (32). The air extraction plates (33) are used to extract the hot air in the barrel (1), and a plurality of air holes (331) are provided on the surface of the air extraction plates (33).

2. The production process of a special polyvinyl chloride granule for steam sterilization according to claim 1, characterized in that, A plurality of rotatable air extraction cylinders (35) are connected to the circumferential surface of the first housing (31). The air extraction cylinders (35) are arranged in the second housing (32). The air extraction cylinders (35) are used to extract the hot air in the second housing (32). A first through hole (36) is provided on the surface of the air extraction cylinder (35), and a second through hole (37) matching the first through hole (36) is provided on the second housing (32). The second through hole (37) is communicated with the inside of the air extraction plate (33).

3. The production process of a special polyvinyl chloride granule for steam sterilization according to claim 2, characterized in that, A driving motor (4) is installed on the cooling pipe (2). A rotating shaft (401) is connected to the driving motor (4), and a plurality of incomplete center gears (402) corresponding to the heat dissipation mechanisms (3) one by one are fixedly connected to the rotating shaft (401).

4. The production process of a special polyvinyl chloride granule for steam sterilization according to claim 3, characterized in that, An internal gear ring (34) corresponding to the incomplete center gear (402) is fixedly connected to the first housing (31), and a planetary gear (6) meshing with the incomplete center gear (402) and the internal gear ring (34) is installed on the inner wall of the cooling pipe (2). When the rotating shaft (401) rotates, it drives the first housing (31) to rotate intermittently.

5. The production process of a special polyvinyl chloride granule for steam sterilization according to claim 4, characterized in that, A complete bevel gear (38) is fixedly connected to the air extraction cylinder (35), and an incomplete bevel gear (5) meshing with the complete bevel gear (38) is fixedly connected inside the cooling pipe (2). When the first housing (31) rotates, it drives the air extraction cylinder (35) to rotate intermittently.

6. The production process of a special polyvinyl chloride granule for steam sterilization according to claim 5, characterized in that, A rotating disk (39) is coaxially and fixedly connected to the air extraction cylinder (35), and a plurality of stirring blades (310) are fixedly connected to the rotating disk (39) for stirring the polyvinyl chloride particles in the barrel (1).

7. The production process of a special polyvinyl chloride granule for steam sterilization according to claim 6, characterized in that, The second housing (32) is provided with an upper and lower two-layer structure, and a sealing strip (311) is fixedly connected to the air extraction cylinder (35), and the sealing strip (311) is sealingly connected between the upper and lower two layers of the second housing (32).

8. The production process of a special polyvinyl chloride granule for steam sterilization according to claim 7, characterized in that, The diameter of the air hole (331) is smaller than the diameter of the polyvinyl chloride particles.

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