A bushing centrifugal casting apparatus

Abstract

The application discloses a bushing centrifugal casting equipment. The equipment comprises a base, a fixed frame and a winding assembly, a casting assembly is rotatably installed on the top of the base, a driving motor is arranged at the bottom of the base and is in transmission connection with the casting assembly through a speed reducer, a plurality of equidistant guide wheels are rotatably installed outside the fixed frame, a pull rope connected with the winding assembly passes through the guide wheels and penetrates through the fixed frame and is connected with an adsorption electromagnet, the casting assembly comprises an outer sleeve, a sleeve cover, an inner sleeve, a heat preservation silica gel layer, a limiting bolt and a limiting hole, the inner sleeve is positioned and fitted with the limiting hole of the outer sleeve through a positioning block, and the heat preservation silica gel layer is arranged between the outer sleeve and the inner sleeve. Through optimization of the structure of the casting assembly, the positioning precision and the temperature stability of the bushing casting are improved, the adsorption electromagnet driven by the winding assembly is matched, the automation of the opening and closing of the casting and the taking and placing of the workpiece is realized, the manual intervention is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of centrifugal casting equipment technology, specifically to a bushing centrifugal casting equipment. Background Technology

[0002] Centrifugal casting is a casting method that uses centrifugal force to shape molten metal within a rotating mold. Because it allows the molten metal to distribute evenly under centrifugal force, reducing defects such as porosity and shrinkage cavities in the casting, it is widely used in the production of rotating parts such as bushings and pipe fittings. Bushings, as key components in mechanical transmission systems, require high dimensional accuracy, surface quality, and uniformity of internal structure; therefore, this places stringent demands on the performance of centrifugal casting equipment.

[0003] Existing centrifugal casting equipment for bushings has several shortcomings: First, the mold components are mostly integral structures, resulting in low positioning accuracy between the inner and outer sleeves. This leads to relative misalignment during high-speed rotation, causing uneven bushing wall thickness and affecting product quality. Second, the mold lacks effective insulation, causing the molten metal to cool too quickly during casting, leading to defects such as cold shuts and cracks, particularly impacting the casting quality of thin-walled bushings. Third, the opening and closing of the mold and the handling of castings rely heavily on manual operation, which is not only labor-intensive but also prone to mold positioning errors due to human intervention. Furthermore, the timing of handling is difficult to control precisely, further affecting production efficiency and product consistency. Fourth, the drive mechanism lacks stability and has low precision in adjusting rotation speed, making it impossible to accurately adjust the speed according to the casting requirements of bushings of different materials and specifications, thus limiting the equipment's applicability. Summary of the Invention

[0004] The purpose of this invention is to provide a bushing centrifugal casting device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a bushing centrifugal casting device, comprising a base, a fixed frame, and a winding assembly. A casting mold assembly is rotatably mounted on the top of the base, and a drive motor is provided at the bottom of the base. The drive motor is connected to the casting mold assembly in a transmission connection. The fixed frame and the winding assembly are located on the top of the base. Several guide wheels are rotatably mounted on the outside of the fixed frame. A pull rope is connected to the winding assembly. One end of the pull rope passes around the guide wheels and through the fixed frame, connecting to an electromagnet. The casting mold assembly includes an outer sleeve, a sleeve cover, an inner mold sleeve, a thermal insulation silicone layer, a limiting bolt, and a limiting hole. The sleeve cover is located on the top of the outer sleeve. The inner mold sleeve is located inside the outer sleeve. The thermal insulation silicone layer is located between the outer sleeve and the inner mold sleeve. The limiting bolt is threaded through the outer sleeve. A limiting hole is provided on the outside of the inner mold sleeve, and the limiting hole is adapted to the outer sleeve.

[0006] Preferably, the bottom of the inner sleeve is provided with two positioning blocks, and the bottom of the outer sleeve is provided with two positioning holes, the positioning holes being adapted to the positioning blocks.

[0007] Preferably, the thermal insulation silicone layer is made of high-temperature resistant silicone material, the outer wall of the thermal insulation silicone layer is fixed to the inner wall of the outer sleeve by adhesive, and the inner wall of the thermal insulation silicone layer is in contact with the inner sleeve.

[0008] Preferably, a reduction gearbox is provided at the bottom of the base, the drive motor is located at the bottom of the reduction gearbox, the output shaft of the drive motor is connected to the reduction gearbox, and the drive shaft of the reduction gearbox passes through the base and is connected to the outer sleeve.

[0009] Preferably, the base is provided with support legs at each of the four corners at its bottom.

[0010] Preferably, the winding assembly includes a winding bracket, a winding roller, and a winding motor. The winding roller is rotatably mounted inside the winding bracket, and the winding motor is located outside the winding bracket. The output shaft of the winding motor passes through the winding bracket and is connected to the winding roller. The length of the pull rope portion is wound around the outside of the winding roller.

[0011] Preferably, the outer surface of the guide wheel is provided with anti-slip texture.

[0012] Preferably, one end of the cap is hinged to the outer sleeve, and the other end of the cap is connected to the outer sleeve via a locking structure.

[0013] Preferably, the fixed frame has a through hole inside, and one end of the pull rope passes through the through hole and is connected to the electromagnet.

[0014] Preferably, both the drive motor and the winding motor are servo motors.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Precise and stable positioning: Through the initial positioning of the positioning block and positioning hole, and the further fixation of the limiting bolt and limiting hole, the inner sleeve and outer sleeve are precisely positioned, avoiding relative offset during rotation, ensuring uniform wall thickness of the cast bushing, and improving the dimensional accuracy of the product. 2. A high-temperature resistant silicone insulation layer is set between the outer sleeve and the inner sleeve, which can effectively slow down the cooling rate of the liquid metal, avoid defects such as cold shuts and cracks, and improve the uniformity of the internal structure and surface quality of the casting. 3. By using the pull rope driven by the winding assembly in conjunction with the adsorption electromagnet, the automatic opening and closing of the cylinder cover and the automatic picking and placing of castings are realized, reducing manual intervention, reducing labor intensity, and improving production efficiency and product consistency. 4. It adopts a servo motor as the drive motor and winding motor, and works with a gearbox to achieve precise speed adjustment, ensuring the stability of mold rotation and rope winding. It can adapt to the casting needs of bushings of different materials and specifications, and has a wide range of applications. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall device of the present invention; Figure 2 In this invention Figure 1 Another perspective view; Figure 3 This is a schematic diagram of the winding assembly in this invention; Figure 4 This is a schematic diagram of the internal structure of the outer sleeve in this invention; Figure 5 This is a split view of the inner sleeve and outer sleeve in this invention; Figure 6 This is a schematic diagram of the external structure of the inner sleeve in this invention; Figure 7 This is a top view of the outer sleeve in this invention.

[0017] In the diagram: 1. Base; 2. Casting assembly; 21. Outer sleeve; 211. Positioning hole; 22. Sleeve cover; 23. Inner sleeve; 231. Positioning block; 24. Thermal insulation silicone layer; 25. Limiting bolt; 26. Limiting hole; 3. Drive motor; 4. Gearbox; 5. Fixing frame; 6. Guide wheel; 7. Pull rope; 8. Adsorption electromagnet; 9. Winding assembly; 91. Winding bracket; 92. Winding roller; 93. Winding motor; 10. Support leg. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-7 The present invention provides a technical solution: Example: A bushing centrifugal casting device: A bushing centrifugal casting device includes a base 1, a fixed frame 5, and a winding assembly 9. A mold assembly 2 is rotatably mounted on the top of the base 1, and a drive motor 3 is provided at the bottom of the base 1. The drive motor 3 is connected to the mold assembly 2. The fixed frame 5 and the winding assembly 9 are located on the top of the base 1. Several guide wheels 6 are rotatably mounted on the outside of the fixed frame 5 at equal intervals. A pull rope 7 is connected to the winding assembly 9. One end of the pull rope 7 passes around the guide wheel 6 and through the fixed frame 5 and is connected to an electromagnet 8. The mold assembly 2 includes an outer sleeve 21, a sleeve cover 22, an inner mold sleeve 23, a thermal insulation silicone layer 24, a limiting bolt 25, and a limiting hole 26. The sleeve cover 22 is located on the top of the outer sleeve 21. The inner mold sleeve 23 is located inside the outer sleeve 21. The thermal insulation silicone layer 24 is located between the outer sleeve 21 and the inner mold sleeve 23. The limiting bolt 25 is threaded through the outer sleeve 21. The inner mold sleeve 23 is provided with a limiting hole 26 on its outside, which is adapted to the outer sleeve 21.

[0020] The inner sleeve 23 has two positioning blocks 231 at its bottom, and the outer sleeve 21 has two positioning holes 211 at its inner bottom, which are adapted to the positioning blocks 231.

[0021] The thermal insulation silicone layer 24 is made of high-temperature resistant silicone material. The outer wall of the thermal insulation silicone layer 24 is fixed to the inner wall of the outer sleeve 21 by adhesive, and the inner wall of the thermal insulation silicone layer 24 is in contact with the inner sleeve 23.

[0022] A reduction gearbox 4 is provided at the bottom of the base 1, and a drive motor 3 is provided at the bottom of the reduction gearbox 4. The output shaft of the drive motor 3 is connected to the reduction gearbox 4 for transmission. The drive shaft of the reduction gearbox 4 passes through the base 1 and is connected to the outer sleeve 21.

[0023] The base 1 has four support legs 10 at its bottom corners.

[0024] The winding assembly 9 includes a winding bracket 91, a winding roller 92, and a winding motor 93. The winding roller 92 is rotatably mounted inside the winding bracket 91, and the winding motor 93 is located outside the winding bracket 91. The output shaft of the winding motor 93 passes through the winding bracket 91 and is connected to the winding roller 92. A portion of the length of the pull rope 7 is wound around the outside of the winding roller 92.

[0025] The outer surface of the guide wheel 6 is provided with anti-slip texture.

[0026] One end of the cap 22 is hinged to the outer sleeve 21, and the other end of the cap 22 is connected to the outer sleeve 21 through a locking structure.

[0027] The fixed frame 5 has a through hole inside, and one end of the pull rope 7 passes through the through hole and is connected to the electromagnet 8.

[0028] Both drive motor 3 and winding motor 93 are servo motors.

[0029] The installation method of each component is as follows: First, the four support legs 10 are fixed to the four corners of the bottom of the base 1. They are made of high-quality carbon steel forging and equipped with anti-slip rubber pads and level adjustment bolts at the bottom to adjust the level of the equipment, enhance the stability of the equipment operation, and adapt to different ground conditions. The base 1 is welded from Q235 steel plate and the whole is subjected to aging treatment to eliminate internal stress, which has the characteristics of high strength and high stability, providing a foundation for the installation of each component of the equipment. The gearbox 4 is installed at the center of the bottom of the base 1, and the drive motor 3 is fixed at the bottom of the gearbox 4, so that the output shaft of the drive motor 3 is connected to the input end of the gearbox 4. The drive shaft of the gearbox 4 passes through the base 1 and is fixed to the bottom of the outer sleeve 21 of the casting component 2 to realize power transmission. The gearbox 4 adopts a hardened cylindrical gear gearbox with a transmission efficiency of ≥95%. It works with the drive motor to realize speed regulation, providing stable rotational power for the casting component, and the output speed is precise and controllable.

[0030] Assembly of casting component 2: Two positioning blocks 231 are installed at the bottom of the inner sleeve 23, and two positioning holes 211 are opened at the bottom of the outer sleeve 21. The heat-insulating silicone layer 24 is fixed to the inner wall of the outer sleeve 21 with adhesive. Then, the inner sleeve 23 is placed into the outer sleeve 21, so that the positioning blocks 231 are embedded in the positioning holes 211. The limiting bolt 25 is rotated so that it passes through the outer sleeve 21 and is locked into the limiting hole 26 of the inner sleeve 23, thus completing the fixing of the inner sleeve 23. One end of the cylinder cover 22 is hinged to the outer sleeve 21, and the other end is opened and closed through a locking structure, which facilitates feeding and removing parts.

[0031] Drive motor 3: Utilizing a servo motor, it features fast response, high speed accuracy, and strong overload capacity. With a power output of 5.5kW, it allows for stepless speed adjustment, meeting the casting process requirements of bushings made of different materials. The output shaft of drive motor 3 is connected to the input end of gearbox 4 via a coupling. The output shaft of gearbox 4 passes through base 1 and is fixedly connected to outer sleeve 21, ensuring smooth and reliable power transmission.

[0032] Outer sleeve 21: Made of heat-resistant alloy steel with a wall thickness of 20mm, it has good high temperature resistance and rigidity. The inner bottom is provided with two positioning holes 211 for positioning with the positioning block of the inner sleeve. The side wall is provided with threaded holes for installing limit bolts.

[0033] Inner sleeve 23: Customized according to bushing specifications, made of graphite or heat-resistant alloy, with two positioning blocks 231 and limiting holes 26 on the outside. The positioning blocks are precisely matched with the positioning holes of the outer sleeve, and the limiting holes are matched with the limiting bolts to achieve the fixing and positioning of the inner sleeve.

[0034] Thermal insulation silicone layer 24: Made of high-temperature resistant silicone material, 5mm thick. The outer wall is fixed to the inner wall of the outer sleeve by high-temperature adhesive, and the inner wall is in close contact with the inner mold sleeve. It has good thermal insulation performance, which can slow down the cooling rate of liquid metal and reduce casting defects.

[0035] Cylinder cover 22: Made of steel plate by stamping, one end is hinged to the outer sleeve, and the other end is connected to the outer sleeve through a locking structure. When closed, it has good sealing performance, prevents liquid metal from splashing, and facilitates feeding and removing parts.

[0036] Limiting bolt 25: Made of high-strength alloy steel, with threads penetrating the side wall of the outer sleeve. After tightening, the end is embedded in the limiting hole of the inner sleeve to lock and fix the inner sleeve, preventing the inner sleeve from shifting during high-speed rotation.

[0037] The winding assembly 9 includes a winding bracket 91, a winding roller 92, and a winding motor 93. The winding bracket is made of welded carbon steel, the winding roller is made of seamless steel pipe, and the winding motor is a 1.5kW servo motor. The output shaft is connected to the winding roller, which can realize the winding and unwinding control of the rope.

[0038] Guide wheels 6: There are 3 in total, which are evenly distributed and installed on the outside of the fixed frame. They are made of wear-resistant rubber and have anti-slip texture on the outer surface. They are used to change the direction of the pull rope, reduce the wear of the pull rope, and ensure a smooth picking process.

[0039] Pull rope 7: Made of high-strength steel wire rope with a diameter of 5mm and a breaking tensile strength of ≥5000N. One end is wound around the take-up roller, and the other end passes through the guide wheel, passes through the through hole of the fixed frame, and is connected to the adsorption electromagnet for lifting the casting.

[0040] Adsorption Electromagnet 8: A DC electromagnet with a suction force of 500kg and an input voltage of 24V is used. It is connected to the power control box through a wire. When powered on, it generates a strong magnetic force to attract the casting. When the power is turned off, the magnetic force disappears, making it easy to place the casting.

[0041] The fixed frame 5 is made of carbon steel and is fixed to the top of the base. It is used to install guide wheels and support pull ropes. It has through holes inside to facilitate the pull ropes to pass through. It has good rigidity and stability to ensure that the frame does not deform during the part retrieval process.

[0042] Installation of the fixed frame 5 and the winding assembly 9: The fixed frame 5 is fixed to one side of the top of the base 1, and several guide wheels 6 are rotatably installed on its exterior. The outer surface of the guide wheels 6 is provided with anti-slip texture to prevent the pull rope 7 from slipping. The winding bracket 91 of the winding assembly 9 is fixed to the other side of the top of the base 1. The winding roller 92 is rotatably installed inside the winding bracket 91. The winding motor 93 is fixed to the outside of the winding bracket 91, and its output shaft passes through the winding bracket 91 and is connected to the winding roller 92. One end of the pull rope 7 is wrapped around the winding roller 92, and the other end passes around the guide wheel 6, passes through the through hole of the fixed frame 5, and is connected to the adsorption electromagnet 8. The adsorption electromagnet 8 is used to adsorb the cast parts after they have been formed.

[0043] The working process of this embodiment is as follows: 1. Preparation stage: According to the specifications of the bushing to be cast, select the corresponding inner mold sleeve 23, align the positioning block 231 at the bottom of the inner mold sleeve 23 with the positioning hole 211 at the bottom of the outer sleeve 21, tighten the limiting bolt 25 on the outer sleeve 21 so that the end of the limiting bolt 25 is embedded in the limiting hole 26 of the inner mold sleeve 23, and complete the fixing of the inner mold sleeve 23; open the cylinder cover 22, inject molten metal such as aluminum alloy liquid into the cavity between the inner mold sleeve 23 and the outer sleeve 21, close the cylinder cover 22 and lock the locking structure.

[0044] 2. Centrifugal casting stage: Start the drive motor 3 and adjust the speed to a preset value such as 800 r / min through the gearbox 4. Drive the outer sleeve 21 and the inner mold sleeve 23 to rotate synchronously. Under the action of centrifugal force, the molten metal is evenly distributed on the inner wall of the cavity and gradually cools and forms.

[0045] 3. Removal Stage: After casting is completed, turn off the drive motor 3. After the mold assembly 2 stops rotating, start the winding motor 93 to drive the winding roller 92 to rotate forward and release the pull rope 7, causing the adsorption electromagnet 8 to descend above the cylinder cover 22. Electrify the adsorption electromagnet 8 to adsorb the cylinder cover 22. Control the winding motor 93 to rotate in the reverse direction to wind up the pull rope 7, causing the cylinder cover 22 to flip and open around the hinge point. Adjust the cooperation between the winding assembly 9 and the guide wheel 6 to move the adsorption electromagnet 8 above the forming bushing. After adsorbing the bushing, control the winding motor 93 to wind up the pull rope 7 to remove the bushing. Turn off the adsorption electromagnet 8, remove the bushing, and complete one casting process.

[0046] The aluminum alloy bushings cast by the equipment in this embodiment have a wall thickness tolerance controlled within ±0.2mm, a surface roughness Ra≤1.6μm, and are free from defects such as cold shuts and cracks. The production efficiency is increased by more than 60% compared with traditional manual operation equipment, meeting the needs of mass precision production.

[0047] Working principle: In use, the base 1 serves as the supporting foundation. The servo drive motor 3, with its speed precisely adjusted via the reduction gearbox 4, drives the outer sleeve 21 and inner sleeve 23 of the casting assembly 2 to rotate synchronously at high speed. The inner sleeve 23 achieves initial positioning through the fit between the bottom positioning block 231 and the positioning hole 211 of the outer sleeve 21, and then completes precise fixation through the cooperation of the limiting bolt 25 and the limiting hole 26, preventing relative displacement during rotation. After liquid metal is injected into the cavity of the casting assembly 2, the liquid metal adheres evenly to the inner wall of the cavity under the action of centrifugal force. The high-temperature resistant silicone insulation layer 24 between the outer sleeve 21 and the inner sleeve 23 can slow down the melting of the liquid metal. The cooling rate is high to avoid defects such as cold shuts and cracks, ensuring the uniformity of the internal structure of the casting. After the casting has cooled and formed, the servo winding motor 93 drives the winding roller 92 to rotate, which drives the pull rope 7 around the anti-slip guide wheel 6 to wind up and down, thereby controlling the lifting and moving of the adsorption electromagnet 8. After the adsorption electromagnet 8 is energized, it adsorbs the cylinder cover 22 of the casting assembly 2. The pull rope 7 winds up and drives the cylinder cover 22 to flip and open around the hinge point. Then, the position of the adsorption electromagnet 8 is adjusted to adsorb the formed bushing, completing the automated picking and placing. The whole process achieves efficient and precise centrifugal casting of the bushing through the precise control of the servo motor and the coordinated cooperation of each component.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bushing centrifugal casting device, characterized in that: The system includes a base (1), a fixed frame (5), and a winding assembly (9). A casting assembly (2) is rotatably mounted on the top of the base (1), and a drive motor (3) is provided at the bottom of the base (1). The drive motor (3) is connected to the casting assembly (2) via a transmission. The fixed frame (5) and the winding assembly (9) are located on the top of the base (1). Several guide wheels (6) are rotatably mounted on the outside of the fixed frame (5). A pull rope (7) is connected to the winding assembly (9). One end of the pull rope (7) passes around the guide wheel (6) and through the fixed frame (5) to connect to an electromagnet (8). The casting assembly (2) includes an outer sleeve (21), a sleeve cover (22), an inner sleeve (23), a thermal insulation silicone layer (24), a limiting bolt (25), and a limiting hole (26). The sleeve cover (22) is located at the top of the outer sleeve (21). The inner sleeve (23) is located inside the outer sleeve (21). The thermal insulation silicone layer (24) is located between the outer sleeve (21) and the inner sleeve (23). The limiting bolt (25) is threaded through the outer sleeve (21). The inner sleeve (23) is provided with a limiting hole (26) on its outside. The limiting hole (26) is adapted to the outer sleeve (21).

2. The bushing centrifugal casting equipment according to claim 1, characterized in that: The inner sleeve (23) has two positioning blocks (231) at its bottom, and the outer sleeve (21) has two positioning holes (211) at its bottom, which are adapted to the positioning blocks (231).

3. The bushing centrifugal casting equipment according to claim 1, characterized in that: The thermal insulation silicone layer (24) is made of high temperature resistant silicone material. The outer wall of the thermal insulation silicone layer (24) is fixed to the inner wall of the outer sleeve (21) by adhesive. The inner wall of the thermal insulation silicone layer (24) is in contact with the inner sleeve (23).

4. The bushing centrifugal casting equipment according to claim 1, characterized in that: The base (1) is provided with a reduction gearbox (4) at the bottom. The drive motor (3) is located at the bottom of the reduction gearbox (4). The output shaft of the drive motor (3) is connected to the reduction gearbox (4) in a transmission manner. The drive shaft of the reduction gearbox (4) passes through the base (1) and is connected to the outer sleeve (21).

5. A bushing centrifugal casting device according to claim 1, characterized in that: The base (1) is provided with legs (10) at the four corners of its bottom.

6. The bushing centrifugal casting equipment according to claim 1, characterized in that: The winding assembly (9) includes a winding bracket (91), a winding roller (92), and a winding motor (93). The winding roller (92) is rotatably mounted inside the winding bracket (91), and the winding motor (93) is located outside the winding bracket (91). The output shaft of the winding motor (93) passes through the winding bracket (91) and is connected to the winding roller (92). A portion of the pull rope (7) is wound around the outside of the winding roller (92).

7. A bushing centrifugal casting device according to claim 1, characterized in that: The outer surface of the guide wheel (6) is provided with anti-slip texture.

8. A bushing centrifugal casting device according to claim 1, characterized in that: One end of the cap (22) is hinged to the outer sleeve (21), and the other end of the cap (22) is connected to the outer sleeve (21) through a locking structure.

9. A bushing centrifugal casting device according to claim 1, characterized in that: The fixed frame (5) has a through hole inside, and one end of the pull rope (7) passes through the through hole and is connected to the electromagnet (8).

10. A bushing centrifugal casting device according to claim 6, characterized in that: Both the drive motor (3) and the winding motor (93) are servo motors.

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