PVDF (Polyvinylidene Fluoride) double-screw extruder equipment

Abstract

The utility model discloses PVDF (Polyvinylidene Fluoride) double-screw extruder equipment which comprises a working table, a material extruding barrel is arranged on the working table, two material extruding screws are arranged in an inner cavity of the material extruding barrel, a driving mechanism used for driving the material extruding screws to rotate is arranged at one end of the material extruding barrel, and the material extruding barrel comprises a plurality of material extruding barrel units which are connected end to end. Two guide rails are arranged on the portion, below the material extruding barrel, of the workbench, a supporting plate is arranged at the bottom of each material extruding barrel unit and slidably supported through two sliding blocks arranged on the two guide rails, each material extruding barrel unit comprises an upper shell and a lower shell, a first inner cavity is formed in the upper shell, and a second inner cavity is formed in the lower shell. The first inner cavity and the second inner cavity are connected through a metal corrugated pipe, a fixing plate is arranged at the top of the upper shell, and two hydraulic cylinders are arranged on the two sides of the bottom of the fixing plate. The device is convenient to maintain, repair and disassemble, time-saving and labor-saving, and low in maintenance and repair cost.

Description

Technical Field

[0001] The utility model relates to the technical field of PVDF production and processing equipment, in particular to a PVDF twin-screw extruder equipment. Background Art

[0002] PVDF is the full name of polyvinylidene fluoride. In the chemical structure of PVDF, it is combined with F-C chemical bonds. This structure with short bond properties forms the most stable and firm combination with hydrogen ions. Therefore, fluorocarbon coatings have specific physical and chemical properties. They not only have strong wear resistance and impact resistance, but also have high anti-fading and anti-ultraviolet properties in extremely harsh and severe environments. In addition, it also has special properties such as piezoelectricity, dielectricity, and pyroelectricity. It has good characteristics such as chemical corrosion resistance, high temperature resistance, and oxidation resistance. For the physical heating modification of PVDF powder products, first, the 10 - 50μm powder products need to be mechanically and continuously quantitatively extruded and transported. During the spiral extrusion and transportation process, the powder materials are gradually heated in stages to transform the solid state into a liquid state, and no physical property change should occur during the rectification and transformation process. While the PVDF product forms a liquid state, it is necessary to accelerate shaping and cooling and solidification, and at the same time, it is necessary to ensure that the product does not undergo qualitative change at high temperatures. PVDF products are a kind of polymeric products and cannot be reversibly restored. Their product melting point is about 171°. Once not well controlled, it will cause product failure and scrapping, resulting in serious losses and qualitative changes.

[0003] Currently, during the production process of PVDF products, the service life of the machine body is relatively long, the gap between the screw and the barrel increases, the discharge port is not smooth, and materials may accumulate for a long time. The materials are gradually carbonized and more carbonized substances adhere to the barrel wall. It is necessary to clean and maintain the working cavity. Generally, the twin-screw is pulled out of the working cavity by workers, and then the inner cavity of the machine is cleaned with special tools. The inner cavity of the machine is narrow, and it is easy to be not cleaned thoroughly. There is also a way to disassemble the machine for maintenance. The disassembly is difficult, time-consuming and laborious, and the maintenance cost is high. Summary of the Utility Model

[0004] The utility model provides a PVDF twin-screw extruder equipment, which solves the problems of difficult disassembly, time-consuming and laborious, and high maintenance cost in the maintenance of traditional PVDF twin-screw extruders.

[0005] The utility model provides a PVDF twin-screw extruder equipment, which includes a workbench. An extrusion barrel is arranged on the workbench. Two extrusion screws are arranged in the inner cavity of the extrusion barrel. A driving mechanism for driving the extrusion screws to rotate is arranged at one end of the extrusion barrel. The extrusion barrel includes a plurality of extrusion barrel units connected end to end. A support plate is arranged at the bottom of each extrusion barrel unit. Two guide rails are arranged on the workbench below the support plate. The support plate is slidably supported by two sliders respectively arranged on the two guide rails. Each extrusion barrel unit includes an upper shell and a lower shell. A first inner cavity is arranged inside the upper shell, and a second inner cavity is arranged inside the lower shell. The first inner cavity and the second inner cavity are connected by a metal bellows. A fixing plate is arranged at the top of the upper shell. Two hydraulic cylinders are arranged on both sides of the bottom of the fixing plate. One end of each hydraulic cylinder is a fixed end fixedly connected to the support plate, and the other end is a telescopic end hingedly connected to a hinge seat arranged at the bottom of the fixing plate.

[0006] In the above technical solution, further, two first ear plates are arranged on both side walls of the upper shell, and two second ear plates are arranged on both side walls of the lower shell. The first ear plates and the second ear plates are fixedly connected by bolts.

[0007] In the above technical solution, further, a heat medium circulation inlet communicated with the first inner cavity is arranged on the side wall of the upper shell, and a heat medium circulation outlet communicated with the second inner cavity is arranged on the side wall of the lower shell.

[0008] In the above technical solution, further, two positioning grooves are arranged on both sides of the bottom of the upper shell, and two positioning bosses matched with the positioning grooves are arranged on both sides of the top of the lower shell.

[0009] In the above technical solution, further, the adjacent two extrusion barrel units are connected by a socket structure.

[0010] In the above technical solution, further, a first exhaust port, a feed port, a second exhaust port, and a vacuum suction port communicated with the inner cavity of the extrusion barrel are sequentially arranged on the top of the extrusion barrel.

[0011] It can be seen from the above technical solutions that the utility model provides a PVDF twin-screw extruder equipment.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] In the utility model, by adjusting the guide rails and the sliders from the locked state to the relatively slidable state, and then moving the two unlocked extrusion barrels in opposite directions, the two extrusion barrels can be separated. Then, loosen the bolts on the upper shell and the lower shell with a wrench, and control the two hydraulic cylinders to lift the fixing plate to drive the upper shell to move upward, so as to automatically separate the upper shell and the lower shell, and expose the inner cavity of the extrusion barrel, which is convenient for cleaning the accumulated materials and carbide adhered to the inner wall of the extrusion barrel. The disassembly of the extrusion barrel is convenient, time-saving and labor-saving, and the maintenance and repair cost is low. Brief Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for use in the implementation cases will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0015] Figure 1 Fig. is the overall structural schematic diagram of a PVDF twin-screw extrusion machine device proposed by the present invention;

[0016] Figure 2 Fig. is the structural schematic diagram of the extrusion screw of a PVDF twin-screw extrusion machine device proposed by the present invention;

[0017] Figure 3 Fig. is the sectional schematic diagram of the extrusion barrel unit structure of a PVDF twin-screw extrusion machine device proposed by the present invention;

[0018] Figure 4 Fig. is the front-side structural schematic diagram of the extrusion barrel unit of a PVDF twin-screw extrusion machine device proposed by the present invention;

[0019] Figure 5 Fig. is the rear-side structural schematic diagram of the extrusion barrel unit of a PVDF twin-screw extrusion machine device proposed by the present invention.

[0020] In the figure:

[0021] 1 - Workbench;

[0022] 2 - Guide rail;

[0023] 3 - Extrusion barrel body; 30 - Extrusion barrel unit; 31 - First exhaust port; 32 - Feed port; 33 - Second exhaust port; 34 - Vacuum suction port; 35 - Slide block; 301 - Support plate; 302 - Upper housing; 303 - Lower housing; 304 - First inner cavity; 305 - Second inner cavity; 306 - Metal bellows; 307 - Fixed plate; 308 - Hydraulic cylinder; 3001 - Positioning groove; 3002 - Positioning boss; 3021 - First ear plate; 3031 - Second ear plate; 3041 - Heat medium circulation inlet; 3051 - Heat medium circulation outlet; 3 - 1 - Rectangular annular boss; 3 - 2 - Rectangular annular groove;

[0024] 4 - Extrusion screw;

[0025] 5 - Driving mechanism. Detailed Implementation Modes

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

[0027] Embodiment 1:

[0028] See Figures 1-5, a PVDF twin-screw extruder equipment, including a workbench 1, two guide rails 2 are arranged on the workbench 2. The two guide rails 2 are horizontally distributed longitudinally and are parallel to each other. Above the two guide rails 2, an extrusion barrel 3 is arranged. Two extrusion screws 4 are arranged in the inner cavity of the extrusion barrel 3. One end of the extrusion barrel 3 is provided with a driving mechanism 5 for driving the extrusion screw 4 to rotate. The top of the extrusion barrel 3 is successively provided with a first exhaust port 31, a feed port 32, a second exhaust port 33, and a vacuum suction port 34 that are connected to its inner cavity. Through the first exhaust port 31 and the second exhaust port 33, the air pressure in the inner cavity of the extrusion barrel 3 is prevented from being too high to affect the conveying quality of the material. The vacuum suction port 34 is connected to a vacuum pump through a trachea. Through the vacuum pump to provide negative pressure suction, a negative pressure state is formed inside the extrusion barrel 3 to prevent the physical properties of the material from changing during the rectification process. The extrusion barrel 3 includes a plurality of extrusion barrel units 30 connected end to end. A support plate 301 is arranged at the bottom of each extrusion barrel unit 30. Two guide rails 2 are arranged on the workbench 1 below the support plate 301. The support plate 301 is slidably supported by two sliders 35 respectively arranged on the two guide rails 2. A clamp is arranged on the slider 35 to lock the slider 35 and the guide rail 2 to prevent relative movement. Each extrusion barrel unit 30 includes an upper shell 302 and a lower shell 303. The upper shell 302 and the lower shell 303 are buckled together in an up-and-down structure, which is convenient for disassembly and assembly. A closed first inner cavity 304 is arranged inside the upper shell 302, and a closed second inner cavity 305 is arranged inside the lower shell 303. The first inner cavity 304 and the second inner cavity 305 are connected and communicated through a metal bellows 306, which is convenient for introducing the heat-conducting oil in the first inner cavity 304 into the second inner cavity 305 to make the heating temperatures of the upper and lower parts of the extrusion barrel 3 consistent. At the same time, during the maintenance process, the internal heat-conducting oil does not need to be drained out. A fixing plate 307 is arranged at the top of the upper shell 302. Two hydraulic cylinders 308 are arranged on both sides of the bottom of the fixing plate 307. One end of each hydraulic cylinder 308 is a fixed end fixedly connected to the support plate 301, and the other end is a telescopic end hinged to a hinge seat arranged at the bottom of the fixing plate 307. By adjusting the clamp on the slider 35 to change the locked state of the guide rail 2 and the slider 35 to a relatively slidable state, and then moving the two unlocked extrusion barrels 3 in opposite directions, the two extrusion barrels 3 can be separated. Then, the controller is used to control the two hydraulic cylinders 308 to lift the fixing plate 307, and the fixing plate 307 drives the upper shell 302 to move upward to separate the upper shell 302 from the lower shell 303, exposing the inner cavity of the extrusion barrel 3, which is convenient for cleaning the accumulated material and carbide adhered to the inner wall of the extrusion barrel 3. The extrusion barrel 3 is disassembled conveniently, saving time and effort, and having a low maintenance and repair cost.

[0029] In this embodiment, refer to Figure 1 、 3, two first ear plates 3021 are welded and fixed to the two side walls of the upper housing 302, and two second ear plates 3031 are welded and fixed to the two side walls of the lower housing 303. The first ear plate 3021 and the second ear plate 3031 are fixedly connected by bolts, so that the two sides of the upper housing 302 and the two sides of the lower housing 303 are fixedly connected by bolts. During the maintenance and repair process, only by loosening the bolts, the upper housing 302 and the lower housing 303 can be quickly separated for maintenance work. The disassembly is convenient, which reduces the difficulty of maintenance and saves the maintenance cost.

[0030] In this embodiment, refer to Figure 3 , a heat medium circulation inlet 3041 communicating with the first inner cavity 304 is provided on the side wall of the upper housing 302, and a heat medium circulation outlet 3051 communicating with the second inner cavity 305 is provided on the side wall of the lower housing 303. By connecting the heat medium circulation inlet 3041 to the heat transfer oil supply device, the heat transfer oil enters the first inner cavity 304 of the upper housing 302 from the heat medium circulation inlet 3041, and then is introduced into the second inner cavity 305 of the lower housing 303 through the metal bellows 306, and then discharged from the heat medium circulation inlet 3041, so that the heat transfer oil circulates between the upper housing 302 and the lower housing 303. During maintenance, it is not necessary to drain the heat transfer oil, and the upper housing 302 and the lower housing 303 can be separated up and down, so that the inner cavity of the extrusion barrel 3 is exposed, which is convenient for maintenance and saves the maintenance time.

[0031] In this embodiment, refer to Figure 3 , two positioning grooves 3001 are provided on both sides of the bottom of the upper housing 302, and two positioning bosses 3002 matching the positioning grooves 3001 are provided on both sides of the top of the lower housing 303. During the up and down assembly process of the upper housing 302 and the lower housing, the positioning grooves 3001 and the positioning bosses 3002 are installed in alignment up and down, which improves the installation efficiency, reduces the installation difficulty, and ensures the installation accuracy.

[0032] In this embodiment, refer to Figure 4 、 5 , which shows the front and rear structural schematic diagrams of the extrusion barrel unit 30. The adjacent two extrusion barrel units 30 are connected by a socket structure. The socket structure includes a rectangular annular boss 3-1 provided on the front end face of one of the extrusion barrel units 30 and a rectangular annular groove 3-2 provided on the rear end face of the other extrusion barrel unit 30. The adjacent two extrusion barrel units 30 are connected by inserting the rectangular annular boss 3-1 into the rectangular annular groove 3-2. Each rectangular annular boss 3-1 is composed of two semi-circular bosses on the upper housing 302 and the lower housing 303, and the rectangular annular groove 3-2 is composed of two semi-circular grooves.

[0033] As can be seen from the above technical solution, during use, first adjust the clamp on the slider 35 to make the slider 35 and the guide rail 2 in a non-locked state. Then, push the extrusion barrel 3 at the part to be repaired to separate it from the adjacent extrusion barrels 3 on both sides. Then, loosen the bolts on the extrusion barrel 3 at the part to be repaired. Then, control the corresponding hydraulic cylinders 308 on both sides of the extrusion barrel 3 through the controller to lift the fixing plate 307 on the extrusion barrel 3 at the part to be repaired, driving the upper shell 302 to move upward, so that the upper shell 302 is separated from the corresponding lower shell 303. After separation, the inner cavity of the extrusion barrel 3 can be exposed, facilitating the cleaning of the accumulated materials and carbide adhered to the inner wall of the extrusion barrel 3.

[0034] After considering the specification and the practice of the utility model disclosed herein, those skilled in the art will readily conceive of other embodiments of the utility model. The utility model is intended to cover any variations, uses, or adaptations of the utility model, which follow the general principles of the utility model and include the common general knowledge or conventional technical means in the technical field not disclosed by the utility model. The specification and the embodiments are only regarded as exemplary, and the true scope of the utility model is pointed out by the claims.

[0035] It should be understood that the utility model is not limited to the precise structure already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above-described embodiments of the utility model do not constitute a limitation on the protection scope of the utility model.

Claims

1. A PVDF twin-screw extrusion machine device, comprising a workbench (1), an extrusion cylinder body (3) is arranged on the workbench (1), two extrusion screws (4) are arranged in the inner cavity of the extrusion cylinder body (3), and a driving mechanism (5) for driving the extrusion screws (4) to rotate is arranged at one end of the extrusion cylinder body (3), characterized in that: The extrusion barrel body (3) comprises a plurality of extrusion barrel units (30) connected end to end. A support plate (301) is arranged at the bottom of each extrusion barrel unit (30). Two guide rails (2) are arranged on the workbench (1) below the support plate (301). The support plate (301) is slidably supported by two sliders (35) separately disposed on the two guide rails (2). Each extrusion barrel unit (30) comprises an upper housing (302) and a lower housing (303). A first inner cavity (304) is arranged inside the upper housing (302), and a second inner cavity (305) is arranged inside the lower housing (303). The first inner cavity (304) is connected to the second inner cavity (305) through a metal bellows (306). A fixing plate (307) is arranged at the top of the upper housing (302). Two hydraulic cylinders (308) are arranged on both sides of the bottom of the fixing plate (307). One end of each hydraulic cylinder (308) is a fixed end fixedly connected to the support plate (301), and the other end is a telescopic end hingedly connected to a hinge seat arranged at the bottom of the fixing plate (307).

2. The PVDF twin-screw extruder equipment according to claim 1, characterized in that, Two first ear plates (3021) are arranged on both side walls of the upper housing (302), and two second ear plates (3031) are arranged on both side walls of the lower housing (303). The first ear plates (3021) are fixedly connected to the second ear plates (3031) by bolts.

3. The PVDF twin-screw extruder equipment according to claim 1, characterized in that, A heat medium circulation inlet (3041) communicating with the first inner cavity (304) is arranged on the side wall of the upper housing (302), and a heat medium circulation outlet (3051) communicating with the second inner cavity (305) is arranged on the side wall of the lower housing (303).

4. A PVDF twin-screw extrusion machine device according to claim 1, characterized in that, Two positioning grooves (3001) are arranged on both sides of the bottom of the upper housing (302), and two positioning bosses (3002) matching with the positioning grooves (3001) are arranged on both sides of the top of the lower housing (303).

5. A PVDF twin-screw extruder device according to claim 1, characterized in that, Adjacent two extrusion barrel units (30) are connected by a socket structure in a matching manner.

6. A PVDF twin-screw extruder device according to claim 1, characterized in that, A first exhaust port (31), a feed port (32), a second exhaust port (33), and a vacuum suction port (34) communicating with the inner cavity of the extrusion barrel body (3) are sequentially arranged at the top of the extrusion barrel body (3).

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