Screw assembly suitable for high-content low-bulk-density boron nitride

Abstract

The utility model discloses a screw assembly suitable for high-content low-bulk-density boron nitride, which belongs to the technical field of boron nitride plastic processing extruders, and comprises a plurality of shells, the upper surface of one shell is fixedly communicated with a feeding cover, the upper surface of one shell is fixedly provided with an extruder metering pump, and the upper surface of the other shell is fixedly provided with a screw rod. An extrusion head is fixedly connected to the right side face of the other shell, two screw rods are jointly and rotationally connected to the interiors of the multiple shells, the two screw rods are kneaded with each other, and the screw directions of the two screw rods are the same. The screw assembly suitable for the high-content and low-stacking-density boron nitride is beneficial to feeding of the low-stacking-density boron nitride, high-proportion boron carbide products can be processed under the condition that energy consumption is not increased, the proportion content of the boron nitride ranges from thirteen percent to fourteen percent, and the yield of the boron nitride products is increased. And the cost of processing high-proportion boron nitride by the double-screw extruder is effectively reduced, and the market competitiveness of the product is improved.

Description

Technical Field

[0001] This application belongs to the field of boron nitride plastic processing extruder technology, and particularly relates to a screw assembly suitable for high-content, low-bulk-density boron nitride. Background Technology

[0002] Boron nitride is resistant to chemical corrosion and is not corroded by inorganic acids and water. Most of its properties are superior to those of carbon materials. For hexagonal boron nitride, it has a very low coefficient of friction, excellent high-temperature stability, excellent thermal shock resistance, high strength, high thermal conductivity, low coefficient of expansion, high resistivity, corrosion resistance, and is transparent to microwaves or infrared rays. Boron nitride requires a twin-screw extruder for processing.

[0003] When using existing twin-screw extruders, the screw assembly cannot simultaneously guarantee the processing quality of boron nitride while reducing the energy consumption ratio of boron nitride processing. This means that twin-screw extruders cannot process high-proportion boron nitride products with the same energy consumption, increasing the cost of processing high-proportion boron nitride products and thus affecting market competitiveness to some extent.

[0004] To address this issue, we propose a screw assembly suitable for high-content, low-bulk-density boron nitride. Utility Model Content

[0005] The purpose of this application is to address the problem in the prior art that twin-screw extruders cannot process high-proportion boron carbide products under the same energy consumption, which increases the cost of processing high-proportion boron carbide products by twin-screw extruders and affects market competitiveness. The application proposes a screw combination suitable for high-content, low-bulk-density boron nitride.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A screw assembly suitable for high-content, low-bulk-density boron nitride includes several housings. A feeding hood is fixedly connected to the upper surface of one housing, an extruder metering pump is fixedly mounted on the upper surface of another housing, and an extrusion head is fixedly connected to the right side of the other housing. Two screws are rotatably connected inside the housings, and the two screws engage with each other. The two screws have the same helical direction. Each screw consists of a single-head SF threaded element in the feeding section, a multi-segment shearing and mixing section in the mixing section, and a small-lead conveying element in the metering section.

[0008] Preferably, each of the housings has multiple fixing bolts threaded inside, and the outer surface of each fixing bolt is threaded to the inner wall of two of the housings.

[0009] Preferably, the upper surface of the feeding cover is movably hinged with a cover plate, and the upper surface of the cover plate is fixedly connected with a handle.

[0010] Preferably, the left end of each of the two screw rods is fixedly connected with a gear, and the outer surfaces of the two gears are in mesh with each other.

[0011] Preferably, the lower portions of the plurality of housings are jointly provided with two support plates, and the bottom surfaces of the two support plates are jointly fixedly connected with a plurality of supporting legs.

[0012] Preferably, the side surfaces of the two support plates, away from each other, are fixedly connected with a plurality of limiting frames, and the inner walls of the plurality of limiting frames are in contact with the outer surfaces of the housings.

[0013] Preferably, the bottom surfaces of the plurality of supporting legs are fixedly connected with positioning plates, and the upper surfaces of the positioning plates are provided with two positioning grooves.

[0014] In summary, the present application has the following technical effects and advantages:

[0015] By setting the screw rod and the housing, the special thread on the screw rod and other structures can be used to better cooperate with the general length-diameter ratio, same-direction kneading double-screw extruder, and the strong conveying capacity of the single-head SF forward conveying thread element introduced by the screw rod feeding section can make it very suitable for conveying low-bulk-density powder materials. For high-content boron nitride, it is especially suitable, thereby preventing backflow caused by air brought in due to low bulk density of the material. The multi-section shear mixing section of the screw rod mixing section can help improve mixing uniformity and reduce energy consumption ratio, prevent material degradation and high torque caused by intensive shear mixing section, and the small lead conveying element of the screw rod metering section can build pressure, which can improve the compactness of the material and the stability of the extrusion discharge pressure under the condition that the vacuum area does not overflow, which helps to feed low-bulk-density boron nitride, thereby processing high-proportion boron carbide products without increasing energy consumption, making the proportion of boron nitride between 13% and 14.5%, effectively reducing the cost of double-screw extruder processing high-proportion boron nitride, and improving the market competitiveness of the product. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic view of the housing of the present application.

[0017] Figure 2 It is a right-side three-dimensional structural schematic view of the feeding cover of the present application.

[0018] Figure 3 It is a three-dimensional structural schematic view of the screw rod of the present application.

[0019] Figure 4The utility model discloses a support plate three-dimensional structure schematic diagram.

[0020] In the figure: 1, shell; 2, feeding cover; 3, extruder metering pump; 4, extrusion head; 5, screw rod; 6, fixed bolt; 7, cover plate; 8, handle; 9, gear; 10, support plate; 11, support leg; 12, positioning plate; 13, positioning groove; 14, limiting frame. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0022] Referring to Figures 1-4 A screw rod combination suitable for high-content low-bulk-density boron nitride includes a plurality of housings 1, a plurality of fixed bolts 6 are threadedly connected in the housings 1, the outer surfaces of the fixed bolts 6 are threadedly connected with the inner walls of two housings 1, the fixed bolts 6 can connect the housings 1 in series, and the direct cooperation firmness and tightness of the housings 1 are ensured.

[0023] The upper surface of one of the housings 1 is fixedly connected with a feeding cover 2, the upper surface of the feeding cover 2 is movably hinged with a cover plate 7, the upper surface of the cover plate 7 is fixedly connected with a handle 8, the cover plate 7 can close the feeding cover 2 when the feeding cover 2 is not used, dust and impurities in the external environment are prevented from entering the feeding cover 2, and the handle 8 can increase the opening and closing convenience of the feeding cover 2.

[0024] The upper surface of one of the housings 1 is fixedly connected with an extruder metering pump 3, the right side of another housing 1 is fixedly connected with an extrusion head 4, two screw rods 5 are rotatably connected in the housings 1, the left ends of the screw rods 5 are fixedly connected with gears 9, the outer surfaces of the gears 9 are meshed with each other, the gears 9 can assist the two screw rods 5 to better keep the same speed, and the cooperation precision of the two screw rods 5 is increased.

[0025] The two screw rods 5 are meshed with each other, the screw directions of the two screw rods 5 are the same, the two screw rods 5 are composed of a feeding section single-head SF threaded element, a mixing section multi-section shear mixing section and a metering section small lead conveying element, two support plates 10 are arranged below the housings 1, the bottom surfaces of the support plates 10 are fixedly connected with a plurality of support legs 11, the support plates 10 and the support legs 11 can support and stabilize the positions of the housings 1, and the use stability of the housings 1 is further improved.

[0026] The two support plates 10 are fixedly connected with a plurality of limiting racks 14 on the sides away from each other, the inner walls of the limiting racks 14 are in contact with the outer surface of the shell 1, and the limiting racks 14 can limit the position of the shell 1 on the support plate 10, so that the shell 1 is not easy to slide relative to the support plate 10 during use.

[0027] The bottom surface of each supporting leg 11 is fixedly connected with a positioning plate 12, and the upper surface of each positioning plate 12 is provided with two positioning grooves 13.

[0028] The working principle of the utility model is that: because two screw rods 5 are provided with spline shafts, connectors, threaded elements on the spline shafts and various kneading elements, and the threaded elements on the two screw rods 5 are provided with a plurality of forward conveying threaded elements and neutral threaded elements distributed along the length direction of the spline shafts, meanwhile, the kneading elements on the two screw rods 5 are also provided with a plurality of forward kneading elements and neutral kneading elements distributed along the length direction of the spline shafts, the combination of the two screw rods 5 forcibly conveys high-content low-bulk-density boron nitride through single-head SF threaded elements, and then when the material is added into the shell 1 through the feeding cover 2, the single-head SF forward conveying threaded elements are introduced in the feeding section of the screw rod 5, under the condition of the same pitch, the single-head SF threaded element is deeper than the ordinary double-head threaded element, has large conveying capacity and is very suitable for conveying low-bulk-density powder materials, especially for high-content boron nitride, thereby preventing backflow caused by air brought in due to low-bulk-density material, in the mixing section of the screw rod 5, a multi-section shearing mixing section is adopted to help improve mixing uniformity and reduce energy consumption ratio, prevent material degradation and high torque caused by intensive shearing mixing section, in the metering section of the screw rod 5, under the condition of ensuring that the vacuum area does not overflow, small lead conveying elements are adopted to build pressure, ensure the compactness of the material and the stability of the extrusion discharge pressure, so that the extruder metering pump 3 can more accurately measure the material quantity, so that the double-screw extruder is helpful for feeding low-bulk-density boron nitride during use, and can process high-proportion boron carbide products without increasing energy consumption, so that the proportion of boron nitride is between 13% and 14.5%, and the cost of the double-screw extruder for processing high-proportion boron nitride is effectively reduced.

[0029] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0030] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0031] The above is only the preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, and it should be covered in the protection scope of the utility model.

Claims

1. A screw combination suitable for high content low bulk density boron nitride comprising a number of housings (1), characterized in that: The upper surface of one of the shell (1) is fixedly connected with a feeding cover (2), the upper surface of one of the shell (1) is fixedly installed with an extruder metering pump (3), the right side of another shell (1) is fixedly connected with an extrusion head (4), the inside of several shell (1) is jointly and rotatably connected with two screw rods (5), two screw rods (5) are mutually pinched, two screw rods (5) have the same screw direction, and two screw rods (5) are both composed of a feeding section single-head SF threaded element, a mixing section multi-section shear mixing section and a metering section small lead conveying element.

2. A screw combination suitable for high content low bulk density boron nitride according to claim 1, characterized in that: The inside of several shell (1) is threadedly connected with a plurality of fixed bolts (6), the outer surface of each fixed bolt (6) is threadedly connected with the inner wall of two shell (1).

3. A screw combination suitable for high content low bulk density boron nitride according to claim 1, characterized in that: The upper surface of the feeding cover (2) is movably hinged with a cover plate (7), and the upper surface of the cover plate (7) is fixedly connected with a handle (8).

4. A screw combination suitable for high content low bulk density boron nitride according to claim 1, characterized in that: The left end of two screw rods (5) is fixedly connected with a gear (9), and the outer surface of two gears (9) is mutually meshed.

5. A screw combination suitable for high content low bulk density boron nitride according to claim 1, characterized in that: The lower side of several shell (1) is jointly provided with two support plates (10), and the bottom surface of two support plates (10) is jointly fixedly connected with several support legs (11).

6. A screw combination suitable for high content low bulk density boron nitride according to claim 5, characterized in that: The side of two support plates (10) away from each other is fixedly connected with several limiting frames (14), and the inner wall of several limiting frames (14) is in contact with the outer surface of the shell (1).

7. A screw combination suitable for high content low bulk density boron nitride according to claim 5, characterized in that: The bottom surface of several support legs (11) is fixedly connected with a positioning plate (12), and the upper surface of each positioning plate (12) is provided with two positioning grooves (13).

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