Double-screw extruder for PVC (polyvinyl chloride) plate production

Abstract

The invention discloses a double-screw extruder for PVC plate production, and relates to the technology of extrusion tools for PVC plate production, the double-screw extruder comprises a bottom plate frame and a main motor fixedly mounted at the upper end of the bottom plate frame through bolts, an electric appliance box is mounted at the upper end of the middle of the bottom plate frame, the driving end of the main motor is fixedly connected to a reduction gearbox, and the reduction gearbox is fixedly mounted on the bottom plate frame through bolts; supporting rods are vertically and fixedly connected to the periphery of the bottom plate frame at equal intervals, a feeding platform is fixedly connected to the upper ends of the supporting rods, a feeding mechanism is installed on one side of the feeding platform, and the feeding mechanism is fixedly connected into the guide cylinder on one side of the butt joint shaft; through mutual cooperation of the double-screw machine barrel and the auger blades, convenience of the PVC plate extruder is facilitated, stability of PVC plate production is further achieved, through mutual cooperation of the heating block and the cooling pipe, the efficiency of the PVC plates is conveniently improved, the high efficiency of PCB production is improved, and finally the problems that the efficiency of a heating system is low and the quality of the PVC plates is low are solved.

Description

Technical Field

[0001] The invention relates to an extrusion tool technology for producing PVC boards, and in particular to a twin-screw extruder for producing PVC boards. Background Art

[0002] As a key method in the field of plastic processing, extrusion technology has been evolving since its birth. In the early days, single-screw extruders pushed plastic raw materials from the feeding section to the extrusion head through a single screw to achieve the initial molding of plastic products; but with the surge in demand for plastic products and the increase in requirements for product quality and production efficiency, twin-screw extruders came into being;

[0003] In the current production process of PVC sheets, there are a series of technical problems that need to be solved urgently. First, the traditional power transmission system often has unstable power transmission due to the insufficient cooperation between the main motor and the reduction box, which in turn affects the continuity and stability of PVC sheet production. This instability not only reduces production efficiency, but may also cause fluctuations in product quality; secondly, there are also problems with the design of PVC sheet extruders; the traditional single-screw or improperly designed twin-screw barrel and the auger blades do not cooperate well enough, making it difficult to ensure the fluidity and uniformity of the material during the extrusion process, thereby affecting the extrusion effect of the PVC sheet and the final product quality; these problems together lead to the disadvantages of low production efficiency and unstable product quality of PVC sheets; therefore, there is an urgent need for a new technical solution that can solve the above problems to improve the production efficiency and product quality of PVC sheets. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a twin-screw extruder for producing PVC sheets.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a twin-screw extruder for PVC board production, comprising a base frame and a main motor fixed to the upper end of the base frame by bolts, an electrical box is installed at the upper end of the middle part of the base frame, the driving end of the main motor is fixedly connected to the reduction box, and the reduction box is fixed to the base frame by bolts, the base frame is vertically and equidistantly fixed with support rods around, the upper end of the support rods is fixedly connected to a feeding platform, a feeding mechanism is installed on one side of the feeding platform, and the feeding mechanism is fixed in a guide barrel on one side of the docking shaft; the other end of the docking shaft in the guide barrel is installed on the upper end of the reduction box, and a stirring and transporting mechanism is installed inside the guide barrel, and a cooling mechanism is installed at the lower end of the stirring and transporting mechanism.

[0006] Preferably, a connecting block is horizontally fixed to the other end of the material guiding cylinder, a double-hole through-groove is opened in the middle of the connecting block, and a protective cover is covered on the outside of the connecting block.

[0007] Preferably, the feeding mechanism includes a first feeding hopper vertically installed at the upper end of the feeding platform. The other end of the first feeding hopper is vertically connected to the upper end of the guiding cylinder, and the other end of the guiding cylinder is vertically installed with a second feeding hopper. The lower end of the second feeding hopper is vertically fixed to the other end of the guiding cylinder, and a material passing observation window is installed on the second feeding hopper.

[0008] Preferably, a fixing frame is installed inside the protective cover, and a heating block is installed between the inner side of the protective cover and the fixing frame. A cooling cavity is opened inside the fixing frame, and a guiding groove is opened inside the fixing frame.

[0009] Preferably, the stirring and transporting mechanism includes a cylindrical rod horizontally installed inside the fixing frame. Screw conveyer blades with different blade spacings are equidistantly installed on the cylindrical rod, and a double-ring fixing block is installed between the outer side of the cylindrical rod and the fixing frame.

[0010] Preferably, a wire conduit is horizontally fixed to the upper end of the protective cover on the outer side of the cylindrical rod.

[0011] Preferably, the cooling mechanism includes a cooling pipe installed in the cooling cavity of the fixing frame. Through grooves are vertically opened on both sides of the lower end of the fixing frame, and a water inlet pipe and a drain pipe are respectively installed in the through grooves. Both the water inlet pipe and the drain pipe are sleeved in a water cooling cylinder vertically installed at the upper end of the bottom frame.

[0012] Preferably, a twin-screw barrel is installed inside the fixing frame. The other end of the twin-screw barrel is sleeved with a screen changer, and a filter screen is installed inside the screen changer.

[0013] Preferably, the other end of the screen changer is sleeved and fixed to one end of a static mixer. The other end of the static mixer is horizontally sleeved on one end of a die head assembly, and the other end of the die head assembly is downwardly sleeved with a discharge cylinder.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the mutual cooperation of the main motor and the reduction box, it is convenient to provide power for the production of PVC plates, improve the stability of PVC plate production, and then realize the function of stable production of PVC plates. Through the mutual cooperation of the twin-screw and the twin-screw barrel, it is convenient for the foaming machine to have better mixing performance, improve the energy conservation and high efficiency of the production process, and then realize the function of a more stable molecular structure, good elasticity, and round pores of the product; Through the mutual cooperation of the cylindrical rod and the screw conveyer blade, it is convenient for the convenience of the PVC plate extruder, and then realizes the stability of PVC plate production. Through the mutual cooperation of the heating block and the cooling pipe, it is convenient to accelerate the efficiency of PVC plates, improve the high efficiency of PCB board production, and finally solve the problems of low heating system efficiency and low quality of PVC plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0016] Figure 1 is a front view structural schematic diagram of the present invention;

[0017] Figure 2 is a top view structural schematic diagram of the present invention;

[0018] Figure 3 is a partial overall three-dimensional structural schematic diagram of the extrusion mechanism of the present invention;

[0019] Figure 4 is a partial internal three-dimensional structural schematic diagram of the extrusion mechanism of the present invention;

[0020] Figure 5 is a bottom view three-dimensional structural schematic diagram of the twin-screw of the present invention;

[0021] Figure 6 is a three-dimensional structural schematic diagram of the cooling pipe of the present invention;

[0022] Figure 7 is a structural schematic diagram of the twin-screw of the present invention.

[0023] Reference numerals in the figure: 1, main motor; 2, reduction gearbox; 3, docking shaft; 4, feeding observation window; 5, electrical box; 6, twin-screw barrel; 7, screen changer; 8, static mixer; 9, die head assembly; 10, water-cooled cylinder; 11, feeding platform; 12, protective cover; 13, fixing bracket; 14, cylindrical rod; 15, auger blade; 16, heating block; 17, conduit; 18, cooling pipe. Detailed implementation manners

[0024] 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.

[0025] Embodiment: Refer to Figures 1 to 7, A twin-screw extruder for PVC sheet production, including a bottom plate frame and a main motor 1 fixedly installed at the upper end of the bottom plate frame by bolts. An electrical box 5 is installed at the upper end in the middle of the bottom plate frame. The driving end of the main motor 1 is fixedly connected to a speed reducer 2, and the speed reducer 2 is fixedly installed on the bottom plate frame by bolts. Support rods are vertically and equidistantly fixedly connected around the bottom plate frame, and the upper ends of the support rods are fixedly connected to a feeding platform 11. A feeding mechanism is installed on one side of the feeding platform 11, and the feeding mechanism is fixedly connected in a guiding cylinder on one side of a docking shaft 3. Through the electrical box 5 and the main motor 1, it is convenient to provide power for the twin-screw extruder for PVC sheet production; the other end of the docking shaft 3 in the guiding cylinder is installed at the upper end of the speed reducer 2, and a stirring and transporting mechanism is installed inside the guiding cylinder, and a cooling mechanism is installed at the lower end of the stirring and transporting mechanism. Through the speed reducer 2 and the docking shaft 3, it is convenient to ensure the stability of the operation of the twin-screw extruder for PVC sheet production; the other end of the guiding cylinder is horizontally fixedly connected to a connecting block, a double-hole through groove is opened in the middle of the connecting block, and a protective cover 12 is covered outside the connecting block. Through the protective cover 12 and the guiding cylinder, it is convenient for the discharge of materials.

[0026] In the present invention, the feeding mechanism includes a first feeding hopper vertically installed at the upper end of the feeding platform 11, the other end of the first feeding hopper is vertically connected to the upper end of the guiding cylinder, and a second feeding hopper is vertically installed at the other end of the guiding cylinder. The lower end of the second feeding hopper is vertically fixedly connected to the other end of the guiding cylinder, and a material-passing observation window 4 is installed on the second feeding hopper. Through the first feeding hopper and the second feeding hopper, it is convenient to discharge the PVB raw material into the inner side of the device; a fixing frame 13 is installed inside the protective cover 12, and a heating block 16 is installed between the inner side of the protective cover 12 and the fixing frame 13. A cooling cavity is opened inside the fixing frame 13, and a guiding groove is opened inside the fixing frame 13. Through the fixing frame 13 and the heating block 16, it is convenient to improve the efficiency of PVB board production; the stirring and transporting mechanism includes a cylindrical rod 14 horizontally installed inside the fixing frame 13, spiral blades 15 with different blade pitches are equidistantly installed on the cylindrical rod 14, and a double-ring fixing block is installed between the outer side of the cylindrical rod 14 and the fixing frame 13. Through the cylindrical rod 14 and the spiral blades 15, it is convenient to transport and extrude the PVB board raw material; a wire conduit 17 is horizontally fixedly connected to the upper end of the protective cover 12 outside the cylindrical rod 14. Through the protective cover 12 and the wire conduit 17, it is convenient for circuit connection and protection of the twin-screw extruder.

[0027] In the present invention, the cooling mechanism includes a cooling pipe 18 installed in the cooling cavity of the fixed frame 13. On both sides of the lower end of the fixed frame 13, through grooves are vertically opened, and a water inlet pipe and a drain pipe are respectively installed in the through grooves. Both the water inlet pipe and the drain pipe are sleeved in a water cooling cylinder 10 vertically installed at the upper end of the bottom plate frame. Through the water cooling cylinder 10 and the cooling pipe 18, it is convenient to cool the device; inside the fixed frame 13, a twin-screw barrel 6 is installed. The other end of the twin-screw barrel 6 is sleeved with a screen changer 7, and a filter screen is installed inside the screen changer 7. Through the twin-screw barrel 6 and the screen changer 7, it is convenient to use a twin-screw extruder for PVC sheet production; the other end of the screen changer 7 is sleeved and fixed at one end of a static mixer 8, the other end of the static mixer 8 is horizontally sleeved at one end of a die head assembly 9, and the other end of the die head assembly 9 is sleeved downward with a discharge barrel. Through the static mixer 8 and the die head assembly 9, it is convenient to efficiently produce PVC sheets.

[0028] Working principle: In this embodiment, the present invention also proposes a method for using a twin-screw extruder for PVC sheet production, including the following steps:

[0029] Step 1, first, through the bottom plate frame and the feeding platform 11, it is convenient to form a twin-screw extruder frame. Then, through the electrical box 5, it is convenient to control the overall operation of the equipment. Before the work starts, like an ordinary single-screw foaming machine, it is necessary to heat the twin-screw barrel and the previous modules. The heating is mainly through the wire conduit 17 and the heating block 16, which is convenient to heat the twin-screw barrel 6 and the previous modules to a temperature capable of melting the raw materials. Then, through the main motor 1 and the reduction gearbox 2, it is convenient to provide drive for the twin-screw extruder, and through the docking shaft 3, it is convenient to transfer the rotational kinetic energy. Then, through the first feeding hopper and the second feeding hopper, it is convenient to feed the raw materials into the main machine. Then, through the feeding observation window 4, it is convenient to observe the feeding situation at all times. Then, through the material guiding cylinder, it is convenient to convey the raw materials;

[0030] Step 2, secondly, through the twin-screw barrel 6 and the cylindrical rod 14, it is convenient to drive the cylindrical rod 14 to rotate through the docking shaft 3. Then, through the auger blade 15, the raw materials in the twin-screw barrel 6 are melted, mixed, and transported to the front modules. Then, through the protective cover 12, it is convenient to maintain the temperature stability of the device;

[0031] Step 3: Then, the strainer 7 is used to filter out impurities such as dust particles and difficult-to-melt substances in the molten mixture to ensure the purity of the product. Then, the static mixer 8 is used to ensure the stability of the internal pressure and prevent excessive internal pressure. Then, the material mixed by the foaming machine is extruded through the die head assembly 9 via the discharge barrel to produce the corresponding product. When the machine needs to stop working, first, the supply of raw materials should be stopped, then the operation of the main motor should be stopped. Then, the barrel can be cooled to a certain temperature through the fixing frame 13 and the cooling cavity. Then, the cooling system is turned off. Finally, all the water and electricity operations of the twin-screw extruder are stopped through the electrical control box 5.

[0032] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A twin-screw extruder for producing PVC sheets, comprising a base frame and a main motor (1) fixed to the upper end of the base frame by bolts, characterized in that: An electrical box (5) is installed at the upper middle end of the base frame, the driving end of the main motor (1) is fixedly connected to the reduction box (2), and the reduction box (2) is fixed to the base frame by bolts. Support rods are fixedly connected vertically and equidistantly around the base frame, and a loading platform (11) is fixedly connected to the upper end of the support rod. A feeding mechanism is installed on one side of the loading platform (11), and the feeding mechanism is fixedly connected to a material guide cylinder on one side of the docking shaft (3); The other end of the docking shaft (3) in the material guide barrel is mounted on the upper end of the reduction box (2), and a stirring and transporting mechanism is installed inside the material guide barrel, and a cooling mechanism is installed at the lower end of the stirring and transporting mechanism.

2. A twin-screw extruder for producing PVC sheets according to claim 1, characterized in that: The other end of the material guide cylinder is horizontally fixedly connected to a connection block, a double-hole through-groove is opened in the middle of the connection block, and the outer side of the connection block is covered with a protective cover (12).

3. A twin-screw extruder for producing PVC sheets according to claim 1, characterized in that: The feeding mechanism comprises a first feed hopper vertically mounted on the upper end of a loading platform (11), the other end of the first feed hopper vertically connected to the upper end of a material guide barrel, and a second feed hopper vertically mounted on the other end of the material guide barrel, the lower end of the second feed hopper vertically fixedly connected to the other end of the material guide barrel, and a material passing observation window (4) is mounted on the second feed hopper.

4. A twin-screw extruder for producing PVC sheets according to claim 2, characterized in that: A fixing frame (13) is installed on the inner side of the protective cover (12), and a heating block (16) is installed between the inner side of the protective cover (12) and the fixing frame (13). A cooling cavity is provided on the inner side of the fixing frame (13), and a material guide trough is provided on the inner side of the fixing frame (13).

5. A twin-screw extruder for producing PVC sheets according to claim 4, characterized in that: The stirring and conveying mechanism comprises a cylindrical rod (14) installed horizontally on the inner side of a fixing frame (13), auger blades (15) with different blade spacings are installed at equal intervals on the cylindrical rod (14), and a double annular fixing block is installed between the outer side of the cylindrical rod (14) and the fixing frame (13).

6. A twin-screw extruder for producing PVC sheets according to claim 5, characterized in that: A wire tube (17) is horizontally fixedly connected to the upper end of the outer protective cover (12) of the cylindrical rod (14).

7. A twin-screw extruder for producing PVC sheets according to claim 1, characterized in that: The cooling mechanism comprises a cooling pipe (18) installed in a cooling cavity of a fixing frame (13), through grooves are vertically opened on both sides of the lower end of the fixing frame (13), and a water inlet pipe and a drain pipe are respectively installed in the through grooves, and the water inlet pipe and the drain pipe are both sleeved in a water cooling cylinder (10) vertically installed at the upper end of the base frame.

8. A twin-screw extruder for producing PVC sheets according to claim 7, characterized in that: A twin-screw barrel (6) is installed on the inner side of the fixing frame (13), a screen changer (7) is sleeved on the other end of the twin-screw barrel (6), and a filter screen is installed on the inner side of the screen changer (7).

9. A twin-screw extruder for producing PVC sheets according to claim 8, characterized in that: The other end of the screen changer (7) is sleeved and fixed on one end of the static mixer (8), the other end of the static mixer (8) is horizontally sleeved on one end of the die assembly (9), and the other end of the die assembly (9) is sleeved downward with a discharge cylinder.

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