PVC plastic modified particle production device

Abstract

The utility model belongs to the technical field of plastic production equipment, specifically a kind of PVC plastic modified granule production device, its smelting mechanism adopts stirring barrel 2 structure, heating plate 302 is equipped in the lateral wall of stirring barrel 2, can melt raw materials, is equipped with stirring structure, can melt material mixing shear to raw materials, small spiral feeder 205 is equipped on smelting mechanism, the outer wall of stirring barrel 2 is the cover plate that can open outward, stirring barrel 2 bottom is connected with an extruding cylinder 3, the discharge end of extruding cylinder 3 is equipped with pelletizing mechanism 7 and screening component, screening component bottom is connected with return pipe 9, can reduce screening fine particle and transport back smelting mechanism, extruding cylinder 3 outside is still equipped with temperature control sleeve 301, is equipped with heating plate 302 and cooling cavity 303, the utility model structure is more compact, and floor area is smaller, can ensure melt shear effect, discharge pressure is stable, and particle size consistency is high, can realize fast reuse fine particle.

Description

Technical Field

[0001] This utility model belongs to the technical field of plastic production equipment, specifically a PVC plastic modified granule production device. Background Technology

[0002] Polyvinyl chloride (PVC), as one of the five major general-purpose plastics, is widely used in building materials, pipes, cables, packaging and other fields due to its excellent mechanical properties, corrosion resistance and cost advantages. However, PVC resin itself has poor thermal stability, high melt viscosity, and usually needs to be blended and modified with a variety of additives such as heat stabilizers, plasticizers, fillers, and modifiers before it can be used, which places extremely high demands on its processing equipment.

[0003] Traditional single-screw or twin-screw extruders are prone to fluctuations in extrusion pressure and flow rate due to factors such as feed uniformity and changes in melt state. This is extremely detrimental to the stability of the downstream pelleting process, easily leading to uneven pellet size and affecting product quality and selling price.

[0004] Replacing the filter requires stopping the machine, interrupting the entire production process, reducing equipment utilization, and wasting raw materials and energy.

[0005] Therefore, there is a need for a new type of PVC modified granule production device that can achieve continuous and automated production, good mixing and dispersion effect, stable extrusion pressure, and can handle recycled materials. Utility Model Content

[0006] Based on this, this solution provides a PVC plastic modified granule production device that meets the requirements of continuous production, has a more compact structure and smaller size, can achieve excellent mixing and dispersion effects, stable base pressure, and high particle size consistency.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0008] A PVC plastic modified granule production apparatus includes: a machine base and an extrusion cylinder, a melting mechanism, and a pelletizing mechanism installed on the machine base. The melting mechanism is installed at the feed end of the extrusion cylinder and has a stirring tank. The stirring tank has a stirring structure inside and a heating ring on its wall. A screen changer, a gear pump, and a die head are sequentially connected to the discharge end of the extrusion cylinder. The pelletizing mechanism is located in the discharge direction of the die head and has a screening component. The bottom of the screening component is connected to a return pipe, which is connected to the stirring tank.

[0009] Optionally, in one embodiment of the present invention, a fan is connected to the lower end of the return pipe to transport fine particles via airflow.

[0010] Optionally, in one embodiment of this utility model, the screen changer is a dual-plunger alternating screen changer to ensure that the material strip is not interrupted.

[0011] Optionally, in one embodiment of the present invention, the screening component includes two inclined screens and a vibrating motor. The upper screen is used to screen large particles, and the lower screen is used to screen out fine particles. The vibrating motor is located outside the screen to provide vibration.

[0012] Optionally, in one embodiment of this utility model, a symmetrically arranged temperature control sleeve is provided outside the extrusion cylinder to ensure that the molten material inside the extrusion cylinder remains in a molten state. The temperature control sleeve is slidably connected to the machine base. The inner side of the temperature control sleeve is a semi-circular heating plate, and the outer side of the heating plate is provided with a cooling cavity. The outer side of the cooling cavity is provided with a heat insulation plate, and the heat insulation plate is also provided with a handle. The top of the temperature control sleeve is provided with a water inlet end communicating with the cooling cavity, and the bottom is provided with a water outlet end for the inlet and outlet of water in the cooling cavity.

[0013] Optionally, in one embodiment of the present invention, the stirring structure includes a stirring motor, a reducer, and a stirring paddle. The stirring motor and the reducer are located at the top of the stirring tank. The stirring paddle is connected to the output end of the reducer. The stirring paddle has anchor blades and staggered central blades. The lower end of the stirring paddle has a shearing part. The shearing part is cylindrical and has multiple protrusions on its surface to improve the shearing effect at the bottom.

[0014] Optionally, in one embodiment of the present invention, the die head is provided with an annular cooling channel for cooling water to flow and cool the material strip.

[0015] Optionally, in one embodiment of the present invention, the bottom of the pelletizing mechanism is provided with a sliding seat to achieve axial sliding.

[0016] Optionally, in one embodiment of the present invention, a heating tube is provided inside the rotating shaft of the stirring paddle.

[0017] Compared with the prior art, the PVC plastic modified granule production device provided by this utility model has the following characteristics:

[0018] The inverted conical mixing tank with independent temperature control in each zone, along with the stirring paddle with built-in heating elements, ensures thorough melting and mixing of raw materials from top to bottom. The discharge end of the extrusion cylinder is equipped with a double-plunger screen changer, enabling continuous filtration without stopping the machine and ensuring continuous production. The die head cooling and screening components prevent particle adhesion and separate particles. The screened fine particles are conveyed back to the mixing tank via airflow, achieving efficient recycling of raw materials. The overall structure of the equipment is more compact, occupies a smaller area, enables continuous production, reduces raw material costs, minimizes waste, and achieves environmental protection. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0021] Figure 2 This is a schematic cross-sectional view of the heating tube and rotating shaft in Embodiment 1 of this utility model;

[0022] Figure 3 This is a schematic diagram of the cross-section of the mold head in Embodiment 1 of this utility model;

[0023] Reference numerals in the attached drawings: 1. Machine base; 2. Mixing tank; 201. Heating ring; 2021. Anchor blade; 2022. Central blade; 2023. Shearing section; 2024. Rotating shaft; 2025. Heating tube; 2025. Screw feeder; 205. Reducer; 207. Mixing motor; 208. Exhaust valve; 209. Discharge valve; 210. Extrusion cylinder; 3. Temperature control sleeve; 301. Heating plate; 302. Cooling chamber; 303. Extrusion motor; 304. Screen changer; 4. Gear pump; 5. Die head; 6. Discharge hole; 901. Cooling channel; 602. Water inlet; 603. Water outlet; 604. Pelletizing mechanism; 7. Pelletizing motor; 701. Slide seat; 702. Screen; 8. Vibration motor; 801. Return pipe; 9. Fan; 901. Storage box; 902. Bag filter; 903. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other. The technical solutions of the present invention will be further described below with reference to the accompanying drawings of the embodiments. The present invention is not limited to the specific embodiments described below.

[0025] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "front," "rear," "left," "right," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0026] Example 1

[0027] Because existing production equipment is large in size, lacks continuous production, has insufficient particle size uniformity, and produces fine pellets with poor reusability, a continuous pellet production device was designed. The specific scheme is as follows:

[0028] like Figure 1-3 As shown, a PVC plastic modified granule production device includes: a machine base 1 and an extrusion cylinder 3, a melting mechanism and a pelletizing mechanism 7 installed on the machine base 1. The melting mechanism is installed at the feed end of the extrusion cylinder 3. The melting mechanism is equipped with a mixing tank 2. The mixing tank 2 is equipped with a stirring structure. The tank wall of the mixing tank 2 is equipped with a heating ring 201. The discharge end of the extrusion cylinder 3 is sequentially connected to a screen changer 4, a gear pump 5 and a die head 6. The pelletizing mechanism 7 is located in the discharge direction of the die head 6. The pelletizing mechanism 7 is equipped with a screening component. The bottom of the screening component is connected to a return pipe 9, which is connected to the mixing tank 2.

[0029] The lower part of the mixing tank 2 has an inverted conical structure. The heating ring 201 at the top and the heating ring 201 at the bottom of the mixing tank 2 are independently controlled. The heating temperature of the lower part is higher than that of the upper heating ring 201, which makes the raw materials at the bottom easier to melt. The raw materials at the top can gradually flow downward during the mixing process of the mixing paddle, so that the raw materials can be fully melted and mixed. The bottom of the mixing tank 2 is equipped with an electrically controlled discharge valve 210 to prevent the raw materials from being transported to the extrusion cylinder 3 if they are not fully melted and mixed.

[0030] The lower end of the return pipe 9 is connected to a fan 901, which transports fine particles through airflow. In this embodiment, the return pipe 9 is also connected to a storage box 902 for storing the returned fine particles, which can be reused after subsequent processing. A valve is provided between the return pipe 9 and the storage box 902 to switch the connecting pipeline. The return pipe 9 is connected to the top of the mixing tank 2, and a bag filter 903 is provided in the mixing tank 2 to discharge the returned air. The returned fine particles are then put into the mixing tank 2 for reuse.

[0031] The screen changer 4 is a dual-plunger alternating screen changer 4 to ensure uninterrupted material flow. Since the dual-plunger alternating screen changer 4 is an existing component, its detailed structure will not be described. In the dual-plunger alternating screen changer 4, when impurities accumulate to a certain level on the first screen block, causing the melt pressure to rise to a set value, the system will issue an alarm or automatically initiate the screen changing procedure. The telescopic drive component will push the second screen block slowly into the main flow channel, while the first screen block will be pushed outwards. The second screen block gradually takes over all the filtration work, and the first screen block gradually withdraws. Because the flow channel is always continuous and the cross-sectional area changes very little, the melt flow will not be interrupted.

[0032] The screening component includes two inclined screens 8 and a vibration motor 801. The upper screen 8 is used to screen large particles, and the lower screen 8 is used to screen out fine particles. The vibration motor 801 is located outside the screen 8 to provide vibration.

[0033] The extrusion cylinder 3 is also provided with symmetrically arranged temperature control sleeves 301 to ensure that the molten material inside the extrusion cylinder 3 remains in a molten state. The temperature control sleeves 301 are slidably connected to the machine base 1. The inner side of the temperature control sleeve 301 is a semi-circular heating plate 302, and the outer side of the heating plate 302 is provided with a cooling cavity 303. The outer side of the cooling cavity 303 is a heat insulation plate, and the heat insulation plate is also provided with a handle. The top of the temperature control sleeve 301 is provided with a water inlet that connects to the cooling cavity 303, and the bottom is provided with a water outlet for water to enter and exit the cooling cavity 303. The heating plate 302 fits the outer shape of the extrusion cylinder 3. In this embodiment, the top and bottom of the temperature control sleeve 301 are provided with connecting parts, and the connecting parts are provided with screw holes for installing bolts. The two temperature control sleeves 301 are fixedly connected by bolts. After the bolts are removed, the two temperature control sleeves 301 can be slid open directly through the handle to facilitate the replacement of internal parts. The end of the extrusion cylinder 3 near the mixing tank 2 is connected to an extrusion motor 304.

[0034] The stirring structure includes a stirring motor 208, a reducer 207, and a stirring paddle. The stirring motor 208 and reducer 207 are located at the top of the stirring tank 2. The stirring paddle is connected to the output end of the reducer 207. The stirring paddle has anchor blades 2021 and staggered central blades 2022 to ensure that the center and periphery of the molten material can be stirred and mixed. The lower end of the stirring paddle has a shearing section 2023, which is cylindrical with multiple protrusions on its surface to improve the shearing effect at the bottom. In this embodiment, the protrusions are pyramidal; in other embodiments, they are conical. A heating tube 2025 is installed inside the rotating shaft 2024 of the stirring paddle. The heating tube 2025 is connected to an external power supply, and the heating tube 2025 and the heating ring 201 on the upper part of the stirring tank 2 are linked for control, allowing the raw materials in the center and periphery to be heated simultaneously.

[0035] The die head 6 is provided with an annular cooling channel 602 for cooling water to flow and cool the material strip. The cooling channel 602 is arranged around the die head 6. The top of the die head 6 is provided with a water inlet 603 of the cooling channel 602, and the bottom of the die head 6 is provided with a water outlet 604. The water inlet 603 and the water outlet 604 are connected to an external water supply and drainage device so that the cooling water in the die head 6 can flow in real time to cool the material strip.

[0036] The pelletizing mechanism 7 has a slide block 702 at its bottom to achieve axial sliding. The pelletizing mechanism 7 includes a pelletizing motor 701 and a rotary cutter. The rotary cutter is installed at the output end of the pelletizing motor 701. A baffle is also provided around the output end of the pelletizing motor 701 to prevent the cut particles from falling outside the equipment. The slide block 702 includes a mounting plate and a sliding assembly. The mounting plate is fixedly installed on the sliding assembly. The sliding assembly is a combination of a slider and a guide rail. The pelletizing motor 701 is fixedly installed on the mounting plate. The setting of the slide block 702 facilitates the adjustment of the distance between the rotary cutter and the end face of the die head 6, and also facilitates the cleaning and maintenance of the mechanism.

[0037] Equipment Description:

[0038] Material is fed into the screw feeder 205 and fed at a uniform speed through the screw feeder 205. The raw material is preheated, initially melted and premixed in the mixing tank 2. The lower part of the mixing tank 2 is inverted cone-shaped, which is conducive to the aggregation of materials, prevents powder from accumulating in corners, and ensures that all materials can be stirred and conveyed downward to the extrusion cylinder 3.

[0039] The main purpose of the upper part of the mixing tank 2 is to soften the raw materials, remove some moisture and low-boiling-point volatiles, and achieve the initial uniform distribution of the dry mixture under stirring.

[0040] The temperature at the bottom of the mixing tank 2 is higher, causing the raw materials to reach a preliminary melting state in this area, forming a high-viscosity melt, which is then fully sheared by the shear section 2023.

[0041] The extrusion cylinder 3 receives the molten material from the mixing tank 2, and after being sheared, extruded and mixed by the screw, it is conveyed forward. The temperature control sleeve 301 can control the temperature at different positions of the extrusion cylinder 3 to ensure that the molten material remains in a molten and flowing state.

[0042] The molten material enters the screen changer 4, where impurities are filtered out. The filtered molten material is then pumped to the die head 6 by the gear pump 5, eliminating pressure fluctuations caused by screw pulses and providing a stable melt flow to the die head 6 to ensure uniform particle size.

[0043] The molten material passes through the small holes on the die head 6 to form a continuous strip. The cooling channel 602 immediately cools the strip, causing its surface to initially solidify, preventing it from sticking together during subsequent pellet cutting and ensuring the regularity of the pellet shape.

[0044] The pellets produced by pelletizing enter the screening unit. The upper screen 8 of the screening unit removes oversized pellets or deformed materials, while the lower screen 8 removes undersized debris and fine powder. The fine particles screened out by the lower screen 8 fall into the return pipe 9, and the fine powder is transported by the blower 901 through the pipeline airflow to the bag filter or storage tank 902 at the top of the mixing tank 2.

[0045] The pellet production device in this scheme is equipped with a dual-plunger alternating screen changer 4 and a gear pump 5. The dual-plunger alternating screen changer 4 can automatically switch the filter screen without stopping the machine or interrupting the process, avoiding problems such as production interruption and material waste caused by machine stoppage during production. The gear pump 5 provides stable extrusion pressure to the die head 6, ensuring consistent pellet size and improving equipment utilization and production efficiency.

[0046] The mixing tank 2 features independent temperature control at both the top and bottom. This allows for a smooth process from preheating and mixing to initial melting of the material, avoiding localized overheating and degradation. The mixing tank 2 is equipped with anchor blades 2021, a central blade 2022, and a dedicated shearing section 2023 at the bottom. The anchor blades 2021 and the central blades 2022 achieve the main mixing, while the shearing section 2023 applies shearing force to the high-viscosity melt, ensuring the dispersion and uniform distribution of additives in the matrix and guaranteeing the excellent performance and consistency of the modified particles.

[0047] After pelleting, the pellets are screened by the screening unit. Unqualified fine particles are screened out and returned to the mixing tank 2 through the return pipe 9 for reuse, reducing waste and raw material waste, lowering production costs, and avoiding environmental pollution problems caused by direct disposal.

[0048] The temperature control sleeve 301 can be easily pulled open to the left and right, making it convenient to clean, inspect or replace the internal extrusion cylinder 3 and screw, reducing maintenance difficulty and time costs.

[0049] Example 2

[0050] In this embodiment, the structure of the pellet production device is basically the same as that in Embodiment 1. The difference is that a cyclone separator is used instead of the bag filter 903 and the blower 901 to discharge dust and other particles that may be carried in the fine particles. A pneumatic double gate valve is installed at the bottom of the cyclone separator to control the feeding switch.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A PVC plastic modified granule production device characterized in that, include: The machine base includes an extrusion cylinder, a melting mechanism, and a pelletizing mechanism installed on the machine base. The melting mechanism is installed at the feed end of the extrusion cylinder and has a stirring tank. The stirring tank has a stirring structure inside and a heating ring on its wall. The discharge end of the extrusion cylinder is sequentially connected to a screen changer, a gear pump, and a die head. The pelletizing mechanism is located in the discharge direction of the die head and has a screening component. The bottom of the screening component is connected to a return pipe, which is connected to the stirring tank.

2. The PVC plastic modified particle production device according to claim 1, characterized in that: The lower end of the return pipe is connected to a fan, which transports fine particles through airflow.

3. The PVC plastic modified particle production device according to claim 1, characterized in that: The screen changer is a dual-plunger alternating screen changer to ensure that the material strip is not interrupted.

4. The PVC plastic modified granule production apparatus according to claim 1, characterized in that: The screening component includes two inclined screens and a vibrating motor. The upper screen is used to screen large particles, and the lower screen is used to screen out fine particles. The vibrating motor is located outside the screen to provide vibration.

5. The PVC plastic modified granule production apparatus according to claim 1, characterized in that: The extrusion cylinder is also equipped with symmetrically arranged temperature control sleeves to ensure that the molten material inside the extrusion cylinder remains in a molten state. The temperature control sleeves are slidably connected to the machine base. The temperature control sleeves are segmented jackets. The inner side of the temperature control sleeve is a semi-circular heating plate, and the outer side of the heating plate is a cooling cavity. The outer side of the cooling cavity is a heat insulation plate, and the heat insulation plate is also equipped with a handle. The top of the temperature control sleeve is equipped with a water inlet end that connects to the cooling cavity, and the bottom is equipped with a water outlet end for water to enter and exit the cooling cavity.

6. The PVC plastic modified granule production apparatus according to claim 1, characterized in that: The stirring structure includes a stirring motor, a reducer, and a stirring paddle. The stirring motor and reducer are located at the top of the stirring tank. The stirring paddle is connected to the output end of the reducer. The stirring paddle has anchor blades and staggered central blades. The lower end of the stirring paddle has a shearing section. The shearing section is cylindrical and has multiple protrusions on its surface to improve the shearing effect at the bottom.

7. The PVC plastic modified granule production apparatus according to claim 1, characterized in that: The die head is equipped with an annular cooling channel for cooling water to flow and cool the material strip.

8. The PVC plastic modified granule production apparatus according to claim 1, characterized in that: The pelletizing mechanism is equipped with a sliding base at its bottom to enable axial sliding.

9. A PVC plastic modified granule production apparatus according to claim 6, characterized in that: A heating element is installed inside the rotating shaft of the stirring paddle.

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