An improved centrifugal casting device

Abstract

This application belongs to the field of pipe manufacturing technology, specifically relating to an improved centrifugal casting apparatus. The apparatus includes a main body comprising a pipe mold, a heating coil assembly fitted inside the pipe mold, and a base material pipe fitted inside the heating coil assembly. The pipe mold has a first opening and a second opening at both ends. The outlet end of the molten metal from the casting container extends into the base material pipe through the first opening. A hard particle layer is laid on the inner surface of the base material pipe. The casting container is used to input molten metal onto the surface of the hard particle layer of the base material pipe when the pipe mold is rotated by a driving mechanism. The second opening serves as the inlet and outlet of the base material pipe. This application realizes a composite pipe of hard particles and metal materials. The base material pipe is part of the structure of the molded pipe. After fabrication, the base material pipe can be removed from the pipe mold without the need for a release agent. The process is simple, production efficiency is high, and it meets the personalized pipe requirements of various engineering fields.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline manufacturing technology, and more specifically, relates to an improved centrifugal casting device. Background Technology

[0002] Centrifugal casting is a technique and method that involves injecting molten metal into a high-speed rotating mold, causing the molten metal to fill the mold and form a casting through centrifugal motion. The centrifugal motion ensures that the molten metal effectively fills the mold radially, forming the free surface of the casting. Existing centrifugal casting devices use only one mold. Molten metal is poured into the mold and then centrifugally combined. Alternatively, a graphite tube with an opening in the middle connected to the mold is installed in the mold. The molten metal enters the graphite tube for preheating before flowing into the mold through the opening, thus slowing down the solidification process. However, these existing structures still have the following problems: the formed pipe hierarchy is limited, the pipe material is limited, demolding is difficult after forming, requiring the use of release agents, the overall process is complex, production efficiency is low, manufacturing costs are high, it is not suitable for large-scale industrial production, and it cannot meet the high requirements of various engineering fields for pipes.

[0003] Therefore, a centrifugal casting device that can solve the above problems is needed. Utility Model Content

[0004] To address the aforementioned issues, this invention provides an improved centrifugal casting device that enables the creation of composite pipes from hard particles and metal materials. The base material pipe is an integral part of the formed pipe structure. Once the pipe is completed, it can be directly removed from the mold without the need for a release agent. The process is simple, easy to operate, streamlines the workflow, and offers high production efficiency. It is suitable for large-scale industrial production and application, meeting the customized pipe requirements of various engineering fields.

[0005] This utility model provides an improved centrifugal casting device, including a centrifugal casting device body, a casting container for pouring molten metal into the centrifugal casting device body, and a drive mechanism for rotating the centrifugal casting device body; the centrifugal casting device body includes a tube mold, a heating coil assembly sleeved inside the tube mold, and a base material tube sleeved inside the heating coil assembly; the tube mold has a first opening and a second opening at both ends, the molten metal outlet end of the casting container extends into the interior of the base material tube through the first opening, the inner surface of the base material tube is covered with a hard particle layer, and the casting container is used to input molten metal into the surface of the hard particle layer of the base material tube when the driving mechanism drives the tube mold to rotate; the second opening is the inlet and outlet of the base material tube.

[0006] Furthermore, the centrifugal casting device body 1 also includes baffle assemblies; each end of the tube mold is fastened together by one of the baffle assemblies, and the two baffle assemblies respectively abut against the two ends of the base material tube.

[0007] Furthermore, the centrifugal casting device body 1 also includes connecting rings; there are two connecting rings, which are respectively installed on the inner sides of both ends of the tube mold and sleeved on both ends of the base material tube.

[0008] Furthermore, the heating coil assembly also includes a heating coil and a fixing frame; the heating coil is wound in a spiral shape on the fixing frame, and the fixing frame is connected to the tube mold.

[0009] Furthermore, the winding range of the heating coil covers at least two-thirds of the length of the substrate tube.

[0010] Furthermore, the baffle assembly includes a baffle body; both ends of the tube mold are provided with flange faces that cooperate and connect with the baffle body; one end face of the baffle body is provided with a limiting protrusion ring; the flange face of the tube mold is provided with an annular groove; and the protrusion ring of the baffle body is embedded in the annular groove of the flange face of the tube mold.

[0011] Furthermore, the baffle body has a central hole smaller than the inner diameter of the substrate tube.

[0012] Furthermore, the casting container includes a conduit; the conduit extends into the interior of the substrate tube through the central hole of the baffle body.

[0013] Furthermore, the main body of the baffle is made of mica, ceramic, or gypsum materials.

[0014] The beneficial effects of this utility model are:

[0015] First, this utility model introduces a base material tube structure. Before the base material tube is inserted into the tube mold, a layer of hard particles and metal materials is composited inside the base material tube to form a hard particle layer inside the pipe. Then, the base material tube containing the hard particle layer is inserted into the tube mold. Through centrifugal casting, molten metal is poured onto the inner surface of the hard particle layer of the base material tube to realize a composite pipe of hard particles and metal materials. The base material tube is part of the structure of the prepared pipe. After preparation, the base material tube can be directly removed from the tube mold without the need for a release agent. The process is simple, easy to operate, simplifies the process, and has high production efficiency. It is suitable for large-scale industrial production and application, and meets the personalized needs of various engineering fields for pipes.

[0016] Secondly, in the preferred implementation, the winding range of the heating coil of this utility model covers at least two-thirds of the length of the substrate tube, so that the heating coil can quickly preheat the substrate tube and ensure that the substrate tube is heated evenly. When the molten metal is introduced, the uniform temperature ensures good fluidity of the molten metal during the casting process, resulting in high quality of the molded product and shortening the product production cycle.

[0017] Third, in the preferred implementation, the baffle body of this utility model has a central hole smaller than the inner diameter of the substrate tube, which facilitates the casting container to input the metal solution into the substrate tube through the central hole, while preventing the metal solution from splashing to the outside under the centrifugal action of the centrifugal casting device body rotating.

[0018] Fourth, in the preferred implementation, the present invention uses baffles at both ends of the tube mold to tighten both ends of the base material tube, which facilitates the assembly and disassembly of the base material tube;

[0019] Fifth, in the preferred embodiment, a connecting ring is fitted at each end of the substrate tube of this utility model, and the annular outer wall of the connecting ring is connected to the inner wall of the tube mold, so that the connecting ring can provide stable support for the substrate tube.

[0020] Sixth, in the preferred implementation, each side of the tube mold of this utility model is provided with two driving mechanisms along the length direction to ensure the stability of the tube mold's rotational movement. Attached Figure Description

[0021] Figure 1 This is a perspective structural diagram of the centrifugal casting apparatus according to an embodiment of the present invention;

[0022] Figure 2 This is a front view of a centrifugal casting apparatus according to an embodiment of the present invention;

[0023] Figure 3 yes Figure 2 A sectional view of AA;

[0024] Figure 4 This is a three-dimensional structural diagram of the tube mold, substrate tube, and conductive slip ring in an assembly state according to an embodiment of the present invention;

[0025] Figure 5 This is a perspective structural diagram of the heating coil assembly according to an embodiment of the present invention;

[0026] Figure 6 This is a perspective structural diagram of the connecting ring according to an embodiment of the present invention;

[0027] Figure 7 This is a perspective structural diagram of the baffle assembly according to an embodiment of the present invention;

[0028] Figure 8 This is a three-dimensional structural diagram of the driving mechanism according to an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the structure of a formed pipe prepared using the centrifugal casting apparatus and preparation method of the present invention.

[0030] Among them, 1-Centrifugal casting device body; 10-Pipe mold; 11-Base material tube; 12-Heating coil assembly; 120-Heating coil; 121-Fixing frame; 13-Conductive slip ring; 14-Connecting ring; 15-Baffle assembly; 150-Baffle body; 1500-First limiting protrusion ring; 1501-Second limiting protrusion ring; 151-Locking mechanism; 2-Casting container; 20-Conduit; 3-Drive mechanism; 30-Roller; 31-Bearing seat; 32-Rotating shaft; 33-Motor; A-Hard particle layer; B-Metal layer. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of this application, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] The directional terms such as above, below, left, right, front, and back used in this application are based on the positional relationships shown in the attached drawings. Different attached drawings may result in different positional relationships, therefore they should not be interpreted as limitations on the scope of protection.

[0033] In this application, the terms "installation," "connection," "interlocking," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, or a connection that allows communication between components. They can also refer to a direct connection or an indirect connection through an intermediate medium. They can refer to the internal connection of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0034] This utility model describes an improved centrifugal casting device, which includes a centrifugal casting device body 1, a drive mechanism 3 for rotating the centrifugal casting device body, and a casting container 2 for pouring molten metal into the centrifugal casting device body. The centrifugal casting device body 1 includes a base material tube 11, a heating element 12 sleeved around the base material tube 11, and a tube mold 10 sleeved around the heating element 12. The preparation process begins by treating the inner side of the substrate tube 11 to form a slurry coating. The substrate tube 11 coated with the slurry is then cured at high temperature to obtain a substrate tube 11 with a hard particle layer on the inner surface. The cured substrate tube 11 is then inserted into the clamp inside the tube mold 10 to restrict the axial movement of the substrate tube 11. Using centrifugal casting, the heating element 12 preheats the substrate tube 11 at high temperature. The tube mold 10 is driven to rotate by the driving mechanism 3. The substrate tube 11 and the heating element 12 rotate together with the tube mold 10, and high-temperature molten metal liquid is introduced into the inner surface of the hard particle layer of the substrate tube 11 to form a metal coating. After cooling and solidification, a substrate tube 11 containing hard particles and metal matrix composite material is obtained. Finally, the substrate tube 11 is removed from the tube mold 10 to complete the pipe preparation.

[0035] Example 1

[0036] Refer to the instruction manual appendix Figure 1-4 A centrifugal casting apparatus includes a centrifugal casting apparatus body 1, a casting container 2, and a drive mechanism 3. The centrifugal casting apparatus body 1 is mounted on the drive mechanism 3 and is driven to rotate by the drive mechanism 3. The centrifugal casting apparatus body 1 has a first opening and a second opening at both ends. The first opening is connected to the outlet of the casting container 2 and is the inlet for the molten metal in the casting container 2 to enter the inner wall of the centrifugal casting apparatus body 1. The second opening is the inlet and outlet of the base material tube.

[0037] The centrifugal casting device body 1 includes a tube mold 10, a base material tube 11, a heating coil assembly 12, a conductive slip ring 13, a connecting ring 14, and a baffle assembly 15.

[0038] A heating coil assembly 12 is fitted inside the tube mold 10 and connected to it. Two connecting rings 14 are installed on the inner sides of both ends of the tube mold 10. A base material tube 11 is fitted inside the heating coil assembly 12 and the two connecting rings 14. The connecting rings 14 are used to stably support the base material tube 11. Both ends of the tube mold 10 have openings (i.e., the first and second openings of the centrifugal casting device body 1), and each opening is connected by a baffle assembly 15. The baffle assemblies 15 at both ends of the tube mold 10 abut against the ends of the base material tube 11, clamping the ends of the base material tube 11 to achieve a secure connection between the base material tube 11 and the tube mold 10. A hard particle layer is laid on the inner surface of the base material tube. The casting container 2 is used to input molten metal onto the surface of the hard particle layer of the base material tube 11 when the driving mechanism 3 drives the tube mold 10 to rotate.

[0039] It should be noted that the hard particle layer laid on the inner surface of the substrate tube is formed by coating a mixture of viscous metal slurry and hard particles onto the inner surface of the substrate tube and then curing it.

[0040] The conductive slip ring 13 is sleeved on the outer wall of the tube mold 10. The stator of the conductive slip ring 13 is connected to an external power source through a connecting wire, and the rotor of the conductive slip ring 13 is connected to the heating coil assembly 12 through a connecting wire passing through the through hole of the tube mold 10.

[0041] The central axes of the tube mold 10, the base tube 11, the heating coil assembly 12, the conductive slip ring 13, the connecting ring 14, and the baffle assembly 15 are collinear. The baffle assembly 15 has a central hole smaller than the inner diameter of the base tube 11. The casting container 2 includes a conduit 20, which extends into the base tube 11 through the central hole of the baffle assembly 15 to pour molten metal, preventing the molten metal from splashing to the outside under the centrifugal action of the centrifugal casting device body 1 rotating.

[0042] The structure of this embodiment involves introducing a base tube, forming a hard particle layer on its inner surface, and then inserting the base tube containing the hard particle layer into a pipe mold. A metal layer is then formed on the inner surface of the hard particle layer. This not only produces a pipe with high hardness, high wear resistance, and high temperature resistance through the hard particle layer, but the composite metal layer also improves the structural stability of the hard particle layer. Through multiple composite processes, it can meet the personalized pipe requirements of various engineering fields. The base tube and the pipe mold are connected by a clamping mechanism and are part of the structure of the formed pipe. Compared with existing centrifugal casting devices where the pipe mold and the formed pipe need to be demolded with a release agent, the base tube can be directly removed from the pipe mold after preparation. The process is simple, convenient, and streamlined, with high production efficiency, making it suitable for large-scale industrial production and application.

[0043] Example 2

[0044] Refer to the instruction manual appendix Figure 5This embodiment includes all the structures of Embodiment 1. The heating coil assembly 12 uses an electromagnetic induction heating coil and includes a heating coil 120 and a fixing frame 121. The fixing frame 121 is connected to the inner side of the tube mold 10 and is provided with four arc-shaped support columns, four support rods located inside the four arc-shaped support columns, and fixing rings connected to both sides of the four arc-shaped support columns and four support rods. There is a gap between the four arc-shaped support columns and four support rods. The heating coil 120 is wound in a spiral form between the four arc-shaped support columns and four support rods.

[0045] Preferably, matching threaded holes are made on the arc-shaped support columns of the tube mold 10 and the fixing frame 121, and the tube mold 10 and the fixing frame 121 are connected by fasteners to prevent the heating coil assembly 12 from moving axially inside the tube mold 10 during the rotation of the tube mold 10.

[0046] It should be noted that in this embodiment, the substrate tube 11 is formed by coating the inner layer of the pipe with slurry and curing it to form a hard particle layer, and then it is placed in the heating coil assembly 12 and fixedly connected to the tube mold 10.

[0047] With the structure of this embodiment, the winding range of the heating coil 120 covers at least two-thirds of the length of the substrate tube 11, so that the heating coil 120 can quickly preheat the substrate tube 11 and ensure that the substrate tube 11 is heated evenly. When the molten metal is introduced, the uniform temperature ensures that the molten metal has good fluidity during the casting process, the quality of the molded product is high, and the product production cycle is shortened.

[0048] Example 3

[0049] Based on Embodiment 2, the connection method between the connecting ring 14 and the tube mold 10 is the same as the connection method between the heating coil assembly 12 and the tube mold 10. Matching threaded holes are opened on the connecting ring 14 and the tube mold 10, and the connecting ring 14 and the tube mold 10 are connected by fasteners.

[0050] Refer to the instruction manual appendix Figure 6 The connecting ring 14 has multiple weight-reducing holes or grooves.

[0051] The structure of this embodiment enables a detachable connection between the connecting ring and the tube mold, facilitating assembly and disassembly and achieving stable support for the substrate tube within the tube membrane.

[0052] Example 4

[0053] Refer to the instruction manual appendix Figure 7 Based on Embodiment 2, the baffle assembly 15 includes a baffle body 150 and a locking mechanism 151.

[0054] The tube mold 10 has flange faces at both ends that mate with the baffle body 150. One end face of the baffle body 150 has a first limiting protrusion ring 1500, and the flange face of the tube mold 10 has a limiting groove. The other end face of the baffle body 150 has multiple locking mechanisms 151. Each locking mechanism 151 includes a locking hook, a bracket, and a telescopic cylinder. The locking hook and the telescopic cylinder are mounted on the bracket, and the locking hook is connected to the bracket by a pin. The telescopic rod of the telescopic cylinder is connected to the locking hook by a pin. The locking hook can be controlled manually, pneumatically, or hydraulically. When installing the baffle assembly 15, the first limiting protrusion ring 1500 is inserted into the limiting groove on the flange face of the tube mold 10, so that the baffle body 150 and the two ends of the tube mold 10 are fastened together. When the telescopic rod of the telescopic cylinder extends, the locking hook is in a relaxed state. When the telescopic rod of the telescopic cylinder retracts, the locking hook locks the other side of the flange face of the baffle body and the tube mold 10.

[0055] Optionally, the baffle body 150 may be made of materials such as mica, ceramic, or gypsum.

[0056] In this embodiment, the baffle body 150 has a central hole smaller than the inner diameter of the substrate tube 11, which facilitates the casting container 2 to input the molten metal into the substrate tube 11 through the central hole, while preventing the molten metal from splashing to the outside under the centrifugal action of the centrifugal casting device body 1 rotating.

[0057] Example 5

[0058] Based on embodiment 4, the two connecting rings 14 are located inside the two end faces of the substrate tube 11, that is, a certain distance is maintained from the two end faces of the substrate tube 11. The end face of the baffle body 150, which is provided with the first limiting protrusion 1500, is also provided with a second limiting protrusion 1501. The second limiting protrusion 1501 is concentrically arranged inside the first limiting protrusion 1500. The inner diameter of the second limiting protrusion 1501 matches the outer diameter of the substrate tube 11. During assembly, the substrate tube 11 can be embedded in the second limiting protrusion 1501, and the end face of the substrate tube 11 abuts against the baffle body 150. The second limiting protrusion 1501 and the connecting ring 14 have the same function, further playing a role in providing stable support for the substrate tube 11.

[0059] Example 6

[0060] In another implementation, the baffle body 150 and the tube mold 10 are bolted together, and matching threaded holes are provided on the mounting surfaces of the baffle body 150 and the tube mold 10.

[0061] Example 7

[0062] Refer to the instruction manual appendix Figure 8Based on Embodiment 2, the drive mechanism 3 has at least four components, with two drive mechanisms 3 arranged along the length of each side of the tube mold 10. Each drive mechanism 3 includes a roller 30, a bearing housing 31, a rotating shaft 32, a motor 33, and a mounting bracket. Two bearing housings 31 are spaced apart on the mounting bracket, each housing a bearing. The roller 30 is located between the two bearing housings 31, and is coaxial with the central holes of the two bearings. The rotating shaft 32 passes through the central holes of the two bearings and the roller 30. Each end of the rotating shaft 32 is connected to the output shaft of a motor 33. The motor 33 drives the roller 30 to rotate, which in turn drives the tube mold 10, the substrate tube 11, and the baffle assembly 15 to rotate as a whole.

[0063] In this embodiment, two drive mechanisms 3 are provided on each side of the tube mold 10 along the length direction to ensure the stability of the rotational motion of the tube mold 10.

[0064] Example 8

[0065] Refer to the instruction manual appendix Figure 9 The formed pipe is a shaped pipe prepared using the centrifugal casting apparatus and preparation method of the present invention. The shaped pipe includes a base pipe 11, a hard particle layer A, and a metal layer B.

[0066] The working principle of the improved centrifugal casting device of this utility model:

[0067] First, a metal slurry and hard particles are thoroughly mixed in a specific ratio to prepare the inner layer slurry for the pipe. This inner layer slurry is then coated onto the inside of the base pipe. Next, the base pipe with the hard particle layer on its inner surface is inserted into the heating element inside the pipe mold. Connecting rings are installed at both ends of the base pipe, ensuring they fit against the limiting surfaces of the arc-shaped bosses on the pipe mold. The convex rings of the two baffle bodies are then embedded into the annular grooves on the flange surface of the pipe mold. The baffle body is fastened to both ends of the tube mold by means of locking mechanism, screw connection or welding, so that the two baffle bodies abut against the connecting ring and both ends of the base tube; then the conduit of the casting container extends into the base tube through the central hole of the baffle body at one end of the tube mold, and the prepared metal solution is introduced into the base tube through the conduit of the casting container. The driving mechanism drives the tube mold, base tube and heating coil assembly to rotate as a whole, so that the liquid metal is evenly coated on the inner side of the hard particle layer of the base tube. After cooling and solidification, a molded pipe with hard particles and metal composite material on the inner surface of the base tube is obtained.

[0068] The above description is merely an embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An improved centrifugal casting apparatus, comprising a centrifugal casting apparatus body (1), a casting container (2) for pouring molten metal into the centrifugal casting apparatus body (1), and a drive mechanism (3) for rotating the centrifugal casting apparatus body (1); characterized in that, The centrifugal casting device body (1) includes a tube mold (10), a heating coil assembly (12) sleeved inside the tube mold (10), and a base material tube (11) sleeved inside the heating coil assembly (12). The tube mold (10) has a first opening and a second opening at both ends. The metal solution outlet end of the casting container (2) extends into the interior of the base material tube (11) through the first opening. The inner surface of the base material tube (11) is covered with a hard particle layer. The casting container (2) is used to input metal solution onto the surface of the hard particle layer of the base material tube (11) when the driving mechanism (3) drives the tube mold (10) to rotate. The second opening is the inlet and outlet of the base material tube (11).

2. The improved centrifugal casting apparatus according to claim 1, characterized in that, The centrifugal casting device body (1) also includes a baffle assembly (15); the two ends of the tube mold (10) are fastened together by one of the baffle assemblies (15), and the two baffle assemblies (15) respectively abut against the two ends of the base material tube (11).

3. The improved centrifugal casting apparatus according to claim 1, characterized in that, The centrifugal casting device body (1) also includes connecting rings (14); there are two connecting rings (14), which are respectively installed on the inner sides of both ends of the tube mold (10) and sleeved on both ends of the base material tube (11).

4. The improved centrifugal casting apparatus according to claim 3, characterized in that, The heating coil assembly (12) further includes a heating coil (120) and a fixing frame (121); the heating coil (120) is wound in a spiral on the fixing frame (121), and the fixing frame (121) is connected to the tube mold (10).

5. The improved centrifugal casting apparatus according to claim 4, characterized in that, The winding range of the heating coil (120) covers at least two-thirds of the length of the substrate tube (11).

6. The improved centrifugal casting apparatus according to claim 2, characterized in that, The baffle assembly (15) includes a baffle body (150); the two ends of the tube mold (10) are provided with flange surfaces that cooperate with and connect with the baffle body (150); one end face of the baffle body (150) is provided with a limiting protrusion ring; the flange surface of the tube mold (10) is provided with an annular groove; and the protrusion ring of the baffle body (150) is embedded in the annular groove of the flange surface of the tube mold (10).

7. The improved centrifugal casting apparatus according to claim 6, characterized in that, The baffle body (150) has a central hole smaller than the inner diameter of the substrate tube (11).

8. The improved centrifugal casting apparatus according to claim 6, characterized in that, The casting container (2) includes a conduit (20); the conduit (20) extends into the interior of the substrate tube (11) through the central hole of the baffle body (150).

9. The improved centrifugal casting apparatus according to claim 6, characterized in that, The main body of the baffle (150) is made of mica, ceramic and gypsum materials.

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