Demolding device and method for aluminum alloy casting part

Abstract

The invention relates to the technical field of profile casting, and discloses an aluminum alloy casting part demolding device and method.The aluminum alloy casting part demolding device comprises a base, a first support, a second support and a third support are fixedly installed on the base, a rotating plate is rotatably installed on the base, and a rotating motor is fixedly installed on the first support; according to the device, a heat exchanger is firstly started to drive cooling water to pass through a water inlet pipe and an annular pipe to form closed-loop circulation, the attaching adhesive force of an aluminum alloy bar and a cylindrical die cavity is weakened by means of thermal expansion and cold contraction, then a knocking assembly is started to drive a knocking plate to periodically rebound to impact the outer wall of a cylinder, and therefore the outer wall of the cylinder is knocked; residual adhesion between the bar and the mold cavity is scattered through high-frequency vibration, the demolding mode that a traditional ejector rod forcibly pushes is avoided, demolding stress is soft and uniform in distribution, the problems of bar demolding deflection, clamping stagnation and surface scraping abrasion are solved fundamentally, and the finished product yield and surface quality of the aluminum alloy casting bar are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of profile casting technology, specifically to a demolding device and method for aluminum alloy castings. Background Technology

[0002] Generally speaking, the demolding device is an indispensable key piece of equipment in the aluminum alloy bar casting production process. The core process of aluminum alloy bar casting mainly includes accurately injecting molten aluminum alloy metal into a special mold cavity. After the molten metal has cooled and solidified into a regular bar in the mold cavity, the demolding device is used to smoothly remove the formed bar from the mold cavity, thus completing a single round of casting and ensuring the orderly progress of subsequent bar processing and production flow.

[0003] Most existing demolding processes use ejector pins to forcefully push the solidified bar material out of the mold cavity. However, during the solidification of the molten aluminum alloy within the mold cavity, the outer wall of the bar material adheres to the inner wall of the mold cavity. When the ejector pins forcefully push, the force distribution is extremely uneven, which can cause the bar material to deviate or get stuck during demolding. This not only prevents smooth demolding but also exacerbates the scraping and wear between the bar material and the inner wall of the mold cavity, further deteriorating the surface quality of the bar material. On the other hand, the reaction force from the ejector pins for long-term forced demolding will continuously act on the inner wall of the mold cavity and the ejector pin mounting base. Long-term repeated high-intensity stress impacts can cause deformation and cracks in the inner wall of the mold cavity, damaging the regular structure of the mold cavity. At the same time, the ejector pins themselves may bend, wear, or even break, requiring frequent replacement of ejector pins and mold repair. This not only delays normal production progress but also significantly increases the cost of mold repair and parts replacement, reducing the overall operating efficiency of the casting production line. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a demolding device and method for aluminum alloy castings, thereby solving the technical problems in the prior art.

[0005] The objective of this invention can be achieved through the following technical solutions: A demolding device for aluminum alloy castings, comprising: A base is provided, on which a first bracket, a second bracket, and a third bracket are fixedly mounted. A rotating plate is rotatably mounted on the base. A rotary motor is fixedly mounted on the first bracket. A rotating column is fixedly mounted on the output shaft of the rotary motor. The rotary motor is used to drive the rotating column to rotate 180 degrees. A cylinder is sleeved on the outer circular surface of the top of the rotating column. The rotating column is fixedly connected to the cylinder. A top rod is slidably mounted inside the rotating column. The top rod is driven by a first drive source to move up and down. A lifting frame is slidably mounted on a second support. The lifting frame is driven to rise and fall by a second drive source. Multiple rings are fixedly installed on the lifting frame, and the rings are evenly spaced along the vertical direction. An annular pipe is fixedly installed below each ring. A heat exchanger is fixedly installed at the bottom of the lifting frame. A water inlet pipe and a water outlet pipe are connected to the heat exchanger. The two ends of the annular pipe are connected to the water inlet pipe and the water outlet pipe, respectively. A striking component is provided at the top of each ring. When the rotating column rotates 180 degrees so that the open end of the cylinder faces down, the cylinder is located above the ring, and the cylinder and the ring are coaxially arranged. At this time, the second drive source drives the lifting frame to rise so that the ring fits onto the outer surface of the cylinder. There is a gap between the ring and the annular pipe and the outer surface of the cylinder. At this time, the striking component is used to strike the outer surface of the cylinder.

[0006] As a further aspect of the present invention: each of the annular tubes is provided with a solenoid valve at both ends, and the inner ring of each annular tube is composed of an elastic membrane. When the solenoid valves on half of the annular tubes are closed, the flow rate in the other half of the annular tubes increases, causing the elastic membrane to expand. At this time, the elastic membrane adheres to the outer surface of the cylinder.

[0007] As a further aspect of the present invention: each of the striking components includes a gear ring, a striking plate, a protrusion, a gear, and a servo motor. The gear ring is rotatably mounted on a circular ring. Multiple circumferentially arranged striking plates are rotatably mounted on the circular ring, and the striking plates are connected to the circular ring via torsion springs. The preload of the torsion springs causes one end of the striking plate to rotate toward the outer surface of the cylinder. Multiple circumferentially arranged protrusions are fixedly mounted on the inner wall of the gear ring, and the protrusions slide against the other end of the striking plates. The gear is rotatably mounted on the circular ring and meshes with the gear ring. The gear is driven to rotate by a servo motor fixedly mounted on the circular ring. When the gear ring rotates counterclockwise, the sliding engagement between the protrusions and the striking plates causes the striking plates to overcome the preload of the torsion springs and move away from the outer surface of the cylinder.

[0008] As a further aspect of the present invention: the rotating plate is driven to rotate by a third drive source. A fixed column is fixedly installed at one end of the rotating plate. A lifting rod is slidably installed inside the fixed column. The lifting rod is driven to rise and fall by a fourth drive source built into the fixed column. A rotating disk is provided at the top of the lifting rod. An outer annular cotton is fixedly installed on the top of the rotating disk. An infusion tube is fixedly installed on the third support. The infusion tube is connected to an external liquid supply device. In the initial state of the rotating plate, the fixed column is located below the third support. At this time, the infusion tube faces the outer annular cotton, and the infusion tube delivers the release agent to the outer annular cotton. When the lifting frame rises, the third drive source drives the rotating plate to rotate so that the fixed column is located below the cylinder. The fourth drive source drives the lifting rod to rise. At this time, the outer circular surface of the outer annular cotton slides in contact with the inner wall of the cylinder.

[0009] As a further embodiment of the present invention: an inner annular cotton is fixedly installed on the top of the rotating disk, the inner annular cotton is located inside the outer annular cotton, the inner wall of the inner annular cotton slides in fit with the outer circular surface of the top rod, and there are two infusion tubes, one infusion tube delivers the release agent to the outer annular cotton, and the other infusion tube delivers lubricating oil to the inner annular cotton.

[0010] As a further aspect of the present invention: an annular plate is fixedly installed on the top of the rotating disk, and the annular plate is located between the inner annular cotton and the outer annular cotton.

[0011] As a further embodiment of the present invention: the rotating disk is rotatably mounted on the top of the lifting rod, and a rotating wheel is rotatably mounted on the third bracket. The rotating wheel is driven to rotate by a stepper motor fixedly mounted on the third bracket. In the initial state, the outer circular surface of the rotating disk abuts against the outer circular surface of the rotating wheel.

[0012] A method for demolding aluminum alloy castings, the method being applied to an aluminum alloy casting demolding device as described above, the method comprising the following steps: Step S1: Inject molten aluminum alloy into the cylinder, cool and solidify to form an aluminum alloy rod. At this time, the device is in the initial state, the rotary motor stops, the rotating column is vertically arranged, the cylinder opening faces upward, the top rod is stored at the bottom of the rotating column, the lifting frame is in the low position of the second support, the ring and annular tube are misaligned and separated from the cylinder, and the striking component and heat exchanger are in standby state. Step S2: Start the rotary motor to drive the rotating column to rotate 180 degrees, driving the cylinder to rotate synchronously until the opening is vertically downward, and keep the cylinder, ring and annular tube coaxially arranged to complete the demolding station switching; Step S3: Start the second drive source to drive the lifting frame to rise, so that the ring is fitted outside the cylinder, and the ring, the annular tube and the outer wall of the cylinder are kept in a gap. Start the heat exchanger, and the cooling water flows into the annular tube through the water inlet pipe. After absorbing the residual heat of the bar and the cylinder, it flows back through the drain pipe. The adhesion between the bar and the inner wall of the cylinder is weakened by the principle of thermal expansion and contraction, and the demolding resistance is reduced. Step S4: After cooling is complete, activate the striking component at the top of the ring to strike the outer wall of the cylinder evenly and intermittently. The vibration breaks up the adhesive structure between the rod and the cylinder, achieving flexible loosening of the rod and avoiding damage to the components and defects in the rod caused by hard pushing. Step S5: After the bar is released, the first drive source is started to drive the push rod to move, pushing the bar out of the cylinder to complete the discharge.

[0013] The beneficial effects of this invention are: 1. In this invention, the heat exchanger is first activated to drive the cooling water to form a closed loop circulation through the inlet pipe and the annular pipe. The adhesion between the aluminum alloy rod and the cylindrical mold cavity is weakened by the thermal expansion and contraction. Then, the striking component is activated to drive the striking plate to periodically rebound and hit the outer wall of the cylinder. The high-frequency vibration breaks up the residual adhesion between the rod and the mold cavity, avoiding the traditional demolding method of forcibly pushing with the ejector rod. The demolding force is gentle and evenly distributed, which solves the problems of rod demolding deviation, jamming, and surface scratching and wear from the root, and greatly improves the finished product qualification rate and surface quality of aluminum alloy casting rods.

[0014] 2. In this invention, the cooling water flow rate is controlled by alternating on and off of the solenoid valve at the end of the annular pipe. In the initial stage of cooling, the solenoid valve is fully open to achieve full-area water flow and rapid overall cooling of the cylinder. In the later stage, the solenoid valve is partially closed to increase the water pressure in the water circuit, which pushes the elastic membrane in the inner ring of the annular pipe to expand and stick to the outer wall of the cylinder, achieving close-range and precise enhanced cooling. After cooling is completed, the water pressure drops and the elastic membrane automatically contracts and resets. This not only solves the problems of the single cooling method and high demolding resistance of traditional demolding devices, but also adapts to the cooling and demolding requirements of aluminum alloy bars of different specifications, without interfering with subsequent demolding and coating operations.

[0015] 3. In this invention, the rotating plate switches the work position to achieve the application of release agent to the inner wall of the cylinder and the application of lubricating oil to the ejector rod. The outer annular cotton slides against the inner wall of the cylinder as the rotating plate rises, and the release agent is applied evenly to reduce the subsequent stick adhesion resistance. The inner annular cotton slides against the outer wall of the ejector rod at the same time, and the lubricating oil is applied precisely to reduce the friction loss during lifting. The annular plate prevents the release agent and lubricating oil from mixing, which effectively alleviates the problem of ejector rod wear and jamming and assists in the demolding inside the cylinder. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the rotating column and the cylinder in this invention; Figure 3 This is a schematic diagram of the lifting frame in this invention; Figure 4 This is a schematic diagram of the annular tube structure in this invention; Figure 5 This is a schematic diagram of the elastic membrane expansion structure in this invention; Figure 6 This is a schematic diagram of the rotating column flipping structure in this invention; Figure 7 This is a schematic diagram of the lifting frame structure in this invention; Figure 8 This is a schematic diagram of the structure in which the rotating wheel and the rotating disk abut against each other in this invention; Figure 9This is a schematic diagram of the structure in which the fixed column and the cylinder are aligned in this invention; Figure 10 This is a schematic diagram of the lifting rod rising in this invention.

[0018] In the diagram: 1. Base; 101. First support; 102. Second support; 103. Third support; 2. Rotary motor; 3. Rotating column; 4. Cylinder; 5. Top rod; 6. Lifting frame; 7. Ring; 8. Annular tube; 801. Elastic membrane; 9. Inlet pipe; 10. Drain pipe; 11. Heat exchanger; 12. Solenoid valve; 13. Gear ring; 14. Striking plate; 15. Torsion spring; 16. Protrusion; 17. Gear; 18. Servo motor; 19. Rotating plate; 20. Fixed column; 21. Rotating disk; 22. Lifting rod; 23. Annular plate; 24. Inner annular cotton; 25. Outer annular cotton; 26. Infusion tube; 27. Rotating wheel; 28. Stepper motor. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1-10 As shown, the present invention is a demolding device for aluminum alloy castings, comprising: A base 1 is provided, on which a first bracket 101, a second bracket 102, and a third bracket 103 are fixedly mounted. A rotating plate 19 is rotatably mounted on the base 1. A rotary motor 2 is fixedly mounted on the first bracket 101. A rotating column 3 is fixedly mounted on the output shaft of the rotary motor 2. The rotary motor 2 is used to drive the rotating column 3 to rotate 180 degrees. A cylinder 4 is sleeved on the outer circular surface of the top end of the rotating column 3. The rotating column 3 and the cylinder 4 are fixedly connected. A top rod 5 is slidably mounted inside the rotating column 3. The top rod 5 is driven by a first drive source to lift and lower. A lifting frame 6 is slidably mounted on a second support 102. The lifting frame 6 is driven to rise and fall by a second drive source. Multiple rings 7 are fixedly mounted on the lifting frame 6, and the multiple rings 7 are arranged at equal intervals along the vertical direction. An annular pipe 8 is fixedly mounted below each ring 7. A heat exchanger 11 is fixedly mounted at the bottom of the lifting frame 6. A water inlet pipe 9 and a drain pipe 10 are connected to the heat exchanger 11. The two ends of the annular pipe 8 are respectively connected to the water inlet pipe 9 and the drain pipe 10. A striking component is provided at the top of each ring 7. When the rotating column 3 is rotated 180 degrees so that the open end of the cylinder 4 faces downward, the cylinder 4 is located above the ring 7, and the cylinder 4 and the ring 7 are arranged coaxially. At this time, the second drive source drives the lifting frame 6 to rise so that the ring 7 fits onto the outer surface of the cylinder 4. There is a gap between the ring 7 and the annular pipe 8 and the outer surface of the cylinder 4. At this time, the striking component is used to strike the outer surface of the cylinder 4.

[0021] In one embodiment, the first driving source and the second driving source can be components such as electric cylinders and electric telescopic rods, or other mechanisms capable of lifting and lowering. This embodiment does not impose specific limitations on these components.

[0022] The working principle of this invention: The device is in initial standby mode, the rotary motor 2 is stopped, the rotating column 3 is vertically positioned, the cylinder 4 is open and facing upwards, the top rod 5 is stored at the bottom of the rotating column 3, and the lifting frame 6 is in the low position of the second support 102. During operation, molten aluminum alloy is first precisely injected into the mold cavity of the cylinder 4. After the aluminum alloy rod has completely solidified, the rotary motor 2 is started, driving the rotating column 3 to precisely rotate 180 degrees, causing the cylinder 4 to rotate synchronously until the open end is vertically downwards. Simultaneously, the position is calibrated to ensure that the cylinder 4 is coaxially positioned with the ring 7 and annular tube 8 on the lifting frame 6, thus completing the casting process. The process involves switching from the molding station to the demolding station; then, the second drive source is activated, driving the lifting frame 6 to rise smoothly along the second support 102, so that the ring 7 is fitted onto the outside of the cylinder 4, and the ring 7, the annular tube 8 and the outer wall of the cylinder 4 are kept in a suitable gap to avoid rigid contact that could damage the mold cavity. Then, the heat exchanger 11 is activated, and the cooling water is diverted to each annular tube 8 through the water inlet pipe 9. After fully absorbing the residual heat of the bar and the cylinder 4, it flows back through the drain pipe 10, forming a closed-loop circulating cooling water path. The principle of thermal expansion and contraction is used to weaken the adhesion between the bar and the inner wall of the cylinder 4, greatly reducing the demolding resistance. After the cooling operation is completed, keep the lifting frame 6 in the same position and turn off the heat exchanger 11. Simultaneously start the striking component at the top of the ring 7 to perform uniform intermittent high-frequency striking on the outer wall of the cylinder 4. The vibration force completely breaks up the residual adhesion structure between the bar and the inner wall of the cylinder 4, realizing the flexible loosening of the bar and avoiding component damage and bar defects caused by hard pushing. After the bar is completely loosened, start the first drive source to drive the push rod 5 to move smoothly upward along the rotating column 3, gently pushing the bar to make it smoothly get out of the cylinder 4, completing the automated material discharge. After the material discharge is completed, each drive source runs in reverse, and each component of the device is reset to the initial state in sequence, waiting for the next round of casting demolding cycle. The whole process takes into account demolding efficiency and product and component protection. Through the dual assistance of cooling and de-adhesion and vibration loosening, the demolding process is gentle and without rigid impact, effectively solving the problems of bar demolding deviation, jamming, and surface scratching and wear, and greatly improving the quality of aluminum alloy castings. At the same time, it reduces the impact of the pushing reaction force on the cylinder 4.

[0023] like Figures 1-5 As shown, in a preferred embodiment of the present invention, each of the annular tubes 8 is provided with a solenoid valve 12 at both ends, and the inner ring of each annular tube 8 is composed of an elastic membrane 801. When the solenoid valves 12 on half of the annular tubes 8 are closed, the flow rate in the other half of the annular tubes 8 increases, causing the elastic membrane 801 to expand. At this time, the elastic membrane 801 adheres to the outer surface of the cylinder 4.

[0024] In one embodiment of this invention, it should be noted that the solenoid valve 12 described in this invention is prior art. This invention does not improve upon it. Therefore, it is not necessary to disclose its specific mechanical and circuit structures, and this does not affect the integrity of this invention.

[0025] In practical application, during the initial cooling stage, all solenoid valves 12 are opened, and cooling water circulates within all annular pipes 8, achieving rapid overall cooling of the cylinder 4 and initially reducing the adhesion between the rod and the mold cavity. Once the overall temperature of the cylinder 4 drops to a preset threshold, the water supply to half of the annular pipes 8 is alternately cut off by the solenoid valves 12, causing the water pressure in the other half of the annular pipes 8 to increase, and the elastic membrane 801 to expand and adhere tightly to the cylinder 4. This allows the cooling water to act on the mold cavity at close range, achieving precise and enhanced cooling and further weakening the adhesion between the rod and the mold cavity. Alternating the on / off states of the solenoid valves 12 ensures that the elastic membranes 801 of all annular pipes 8 complete expansion and adhesion, achieving comprehensive and deep cooling of the cylinder 4 and reducing the rod's demolding resistance from the root. After the cooling operation is completed, the water supply to all annular pipes 8 is restored or the main water circuit is cut off. The elastic membrane 801 contracts and resets as the water pressure decreases, detaching from the outer wall of the cylinder 4 without affecting the movement of subsequent components.

[0026] like Figures 1-3As shown, in a preferred embodiment of the present invention, each of the striking components includes a gear ring 13, a striking plate 14, a protrusion 16, a gear 17, and a servo motor 18. The gear ring 13 is rotatably mounted on the ring 7. Multiple circumferentially arranged striking plates 14 are rotatably mounted on the ring 7, and the striking plates 14 are connected to the ring 7 via torsion springs 15. The preload of the torsion springs 15 causes one end of the striking plate 14 to rotate toward the outer surface of the cylinder 4. Multiple circumferentially arranged protrusions 16 are fixedly mounted on the inner wall of the gear ring 13, and the protrusions 16 and the other end of the striking plates 14 are slidably engaged. The gear 17 is rotatably mounted on the ring 7 and meshes with the gear ring 13. The gear 17 is driven to rotate by the servo motor 18 fixedly mounted on the ring 7. When the gear ring 13 rotates counterclockwise, the protrusions 16 and the striking plates 14 are slidably engaged, causing the striking plates 14 to overcome the preload of the torsion springs 15 and move away from the outer surface of the cylinder 4.

[0027] In practical application, the servo motor 18 is started, driving the gear 17 to rotate at a constant speed. The gear 17 meshes and drives the gear ring 13 to rotate counterclockwise. The protrusions 16 on the inner wall of the gear ring 13 move synchronously in a circular motion. When the protrusions 16 slide to the end of the striking plate 14, they push the striking plate 14 to rotate around the hinge point, compressing the torsion spring 15 to store force. When the end of the striking plate 14 passes the protrusions 16, the torsion spring 15 releases its preload, driving the striking plate 14 to rebound quickly and impact the outer surface of the cylinder 4, generating high-frequency vibration, which loosens and separates the rod from the mold cavity. It should be noted that the servo motor 18 adopts... With periodic operation, a single striking plate 14 can complete the displacement from one protrusion 16 to the next protrusion 16 within one operating cycle, ensuring that when the striking stops, the striking plate 14 is stably stationary away from the outer surface of the cylinder 4, avoiding rigid interference with the cylinder 4, and ensuring the smooth lifting of the lifting frame 6. In this way, through periodic vibration striking, combined with the cooling and viscosity reduction effect, the bar can be easily demolded, avoiding the technical problems of bar skewing, surface scratching, and mold cavity deformation and cracking caused by the forced pushing of the existing ejector pin 5. At the same time, it reduces the force loss of the ejector pin 5 and extends the service life of the component.

[0028] like Figures 1-10As shown, in a preferred embodiment of the present invention, the rotating plate 19 is driven to rotate by a third drive source. A fixed column 20 is fixedly installed at one end of the rotating plate 19. A lifting rod 22 is slidably installed inside the fixed column 20. The lifting rod 22 is driven to rise and fall by a fourth drive source built into the fixed column 20. A rotating disk 21 is provided at the top of the lifting rod 22. An outer annular cotton 25 is fixedly installed on the top of the rotating disk 21. An infusion tube 26 is fixedly installed on the third support 103. The infusion tube 26 is connected to an external liquid supply device. In the initial state of the rotating plate 19, the fixed column 20 is located below the third support 103. At this time, the infusion tube 26 faces the outer annular cotton 25 and delivers the release agent to the outer annular cotton 25. When the lifting frame 6 rises, the third drive source drives the rotating plate 19 to rotate so that the fixed column 20 is located below the cylinder 4. The fourth drive source drives the lifting rod 22 to rise. At this time, the outer circular surface of the outer annular cotton 25 slides in cooperation with the inner wall of the cylinder 4.

[0029] Specifically, an inner annular cotton 24 is fixedly installed on the top of the rotating disk 21. The inner annular cotton 24 is located inside the outer annular cotton 25. The inner wall of the inner annular cotton 24 slides in fit with the outer circular surface of the top rod 5. There are two infusion tubes 26. One infusion tube 26 delivers the release agent to the outer annular cotton 25, and the other infusion tube 26 delivers lubricating oil to the inner annular cotton 24.

[0030] Specifically, an annular piece 23 is fixedly installed on the top of the rotating disk 21, and the annular piece 23 is located between the inner annular cotton 24 and the outer annular cotton 25.

[0031] In one embodiment, the third driving source can be a motor, electric motor or other components, or other mechanisms capable of rotational motion. The fourth driving source can be an electric cylinder, electric telescopic rod or other components, or other mechanisms capable of lifting motion. This embodiment does not impose specific limitations on these components.

[0032] In practical application, after the push rod 5 inside the cylinder 4 extends and completes the demolding of the aluminum alloy rod, the rotating plate 19 is in the initial position. Demolding agent is injected into the outer annular cotton 25 through the corresponding infusion pipe 26 until the outer annular cotton 25 is fully saturated with the demolding agent. Then, the rotating plate 19 is rotated to move the fixed column 20 directly below the cylinder 4, and the lifting rod 22 is driven to rise, causing the rotating disk 21 and the outer annular cotton 25 to move upwards. The outer annular cotton 25 slides tightly against the inner wall of the cylinder 4, thus evenly coating the inner wall of the cylinder 4 with the demolding agent. The isolation effect of the demolding agent significantly reduces the adhesion between the subsequent rod and the mold cavity, facilitating smooth demolding. The rotating plate 19 adopts a rotatable design, which serves two purposes: firstly, to provide space for the cylinder 4 during casting and demolding operations to avoid interference; and secondly, to facilitate the injection of demolding agent into the outer annular cotton 25 at the initial position, making operation convenient. The ejector rod 5 repeatedly rises and falls within the rotating column 3 to complete the demolding operation. Long-term operation can easily lead to jamming and wear problems. Therefore, an inner annular cotton 24 is installed on the inner side of the rotating disk 21. Lubricating oil is injected into the inner annular cotton 24 through another infusion pipe 26. When the lifting rod 22 rises, the inner annular cotton 24 slides tightly against the outer wall of the ejector rod 5, coating the surface of the ejector rod 5 with lubricating oil. Only the front end of the ejector rod 5 needs to be lubricated. When the ejector rod 5 retracts, the lubricating oil can be carried into the mating gap of the rotating column 3 to achieve all-round lubrication and reduce wear and jamming. In addition, to prevent the lubricating oil and the release agent from mixing and failing, an annular plate 23 is installed on the rotating disk 21. The annular plate 23 isolates the inner annular cotton 24 and the outer annular cotton 25, completely blocking the mutual penetration of the two additives and ensuring that the release agent and the lubricating oil can each play their respective roles.

[0033] like Figures 1-8 As shown, in a preferred embodiment of the present invention, the rotating disk 21 is rotatably mounted on the top of the lifting rod 22, and the rotating wheel 27 is rotatably mounted on the third bracket 103. The rotating wheel 27 is driven to rotate by the stepper motor 28 fixedly mounted on the third bracket 103. In the initial state, the outer circular surface of the rotating disk 21 abuts against the outer circular surface of the rotating wheel 27.

[0034] In practical application, since the outer surface of the rotating disk 21 abuts against the outer surface of the rotating wheel 27, the rotating wheel 27 is driven to rotate at a constant speed by the stepper motor 28. The rotating wheel 27 drives the rotating disk 21 to rotate synchronously through friction. At this time, the infusion tube 26 delivers the release agent and lubricating oil to the outer annular cotton 25 and the inner annular cotton 24 respectively. The rotation of the rotating disk 21 can make the two additives penetrate evenly into the cotton body, avoiding the problem of excessive or insufficient local adsorption, and ensuring that the release agent and lubricating oil are evenly distributed during subsequent coating. After the cotton body has fully adsorbed the additives, the stepper motor 28 stops, the rotating disk 21 stops rotating, and the rotating plate 19 can drive the fixed column 20 to move to the demolding station.

[0035] Please see Figures 1-10 As shown, the present invention provides a method for demolding aluminum alloy castings. This method is applied to an aluminum alloy casting demolding device as described in the above embodiments, and includes the following steps: Step S1: Molten aluminum alloy is injected into cylinder 4 and cooled and solidified to form aluminum alloy rod. At this time, the device is in the initial state, the rotary motor 2 is stopped, the rotating column 3 is vertically arranged, the cylinder 4 is open and facing upward, the top rod 5 is stored at the bottom of the rotating column 3, the lifting frame 6 is in the low position of the second support 102, the ring 7 and the annular tube 8 are misaligned and separated from the cylinder 4, and the striking component and the heat exchanger 11 are both in standby state. Step S2: Start the rotary motor 2 to drive the rotating column 3 to rotate 180 degrees, which will drive the cylinder 4 to rotate synchronously until the opening is vertically downward, and keep the cylinder 4, ring 7, and annular tube 8 coaxially arranged to complete the demolding station switching; Step S3: Start the second drive source to drive the lifting frame 6 to rise, so that the ring 7 is fitted on the outside of the cylinder 4, and the ring 7, the annular tube 8 and the outer wall of the cylinder 4 are kept in a gap. Start the heat exchanger 11, and the cooling water flows into the annular tube 8 through the water inlet pipe 9. After absorbing the residual heat of the bar and the cylinder 4, it flows back through the drain pipe 10. The adhesion between the bar and the inner wall of the cylinder 4 is weakened by the principle of thermal expansion and contraction, and the demolding resistance is reduced. Step S4: After cooling is complete, start the striking component at the top of the ring 7 to strike the outer wall of the cylinder 4 evenly and intermittently. The vibration breaks up the adhesive structure between the rod and the cylinder 4, so as to achieve flexible loosening of the rod and avoid damage to the parts and defects in the rod caused by hard pushing. Step S5: After the bar is released, the first drive source is started to drive the push rod 5 to move, pushing the bar out of the cylinder 4 to complete the discharge.

[0036] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A demolding device for aluminum alloy castings, characterized in that, include: A base (1) is fixedly mounted with a first bracket (101), a second bracket (102) and a third bracket (103). A rotating plate (19) is rotatably mounted on the base (1). A rotary motor (2) is fixedly mounted on the first bracket (101). A rotating column (3) is fixedly mounted on the output shaft of the rotary motor (2). The rotary motor (2) is used to drive the rotating column (3) to rotate 180 degrees. A cylinder (4) is sleeved on the outer circular surface of the top of the rotating column (3). The rotating column (3) is fixedly connected to the cylinder (4). A top rod (5) is slidably mounted inside the rotating column (3). The top rod (5) is driven by a first driving source to lift and lower. A lifting frame (6) is slidably mounted on a second support (102). The lifting frame (6) is driven to lift by a second drive source. Multiple rings (7) are fixedly mounted on the lifting frame (6). The multiple rings (7) are arranged at equal intervals along the vertical direction. An annular pipe (8) is fixedly mounted below each ring (7). A heat exchanger (11) is fixedly mounted at the bottom of the lifting frame (6). A water inlet pipe (9) and a drain pipe (10) are connected to the heat exchanger (11). The two ends of the annular pipe (8) are connected to the heat exchanger (11). Each ring (7) is connected to the inlet pipe (9) and the drain pipe (10) respectively. Each ring (7) is equipped with a striking component at the top. When the rotating column (3) is rotated 180 degrees so that the open end of the cylinder (4) faces down, the cylinder (4) is located above the ring (7) and the cylinder (4) and the ring (7) are coaxially arranged. At this time, the second drive source drives the lifting frame (6) to rise so that the ring (7) is sleeved on the outer surface of the cylinder (4). Both the ring (7) and the annular tube (8) have gaps with the outer surface of the cylinder (4). At this time, the striking component is used to strike the outer surface of the cylinder (4).

2. The aluminum alloy casting demolding device according to claim 1, characterized in that, Each of the annular tubes (8) is provided with a solenoid valve (12) at both ends. The inner ring of each annular tube (8) is composed of an elastic membrane (801). When the solenoid valve (12) on half of the annular tubes (8) is closed, the flow rate in the other half of the annular tubes (8) increases, causing the elastic membrane (801) to expand. At this time, the elastic membrane (801) fits against the outer surface of the cylinder (4).

3. The aluminum alloy casting demolding device according to claim 1, characterized in that, Each of the aforementioned striking components includes a gear ring (13), a striking plate (14), a protrusion (16), a gear (17), and a servo motor (18). The gear ring (13) is rotatably mounted on a ring (7). Multiple circumferentially arranged striking plates (14) are rotatably mounted on the ring (7), and the striking plates (14) are connected to the ring (7) via torsion springs (15). The preload of the torsion springs (15) causes one end of the striking plate (14) to rotate toward the outer surface of the cylinder (4). Multiple circumferentially arranged protrusions (16) The protrusion (16) is fixedly installed on the inner wall of the gear ring (13), and the other end of the striking plate (14) is slidably engaged. The gear (17) is rotatably installed on the ring (7), and the gear (17) meshes with the gear ring (13). The gear (17) is driven to rotate by the servo motor (18) fixedly installed on the ring (7). When the gear ring (13) rotates counterclockwise, the protrusion (16) and the striking plate (14) are slidably engaged, causing the striking plate (14) to overcome the preload of the torsion spring (15) and move away from the outer surface of the cylinder (4).

4. The aluminum alloy casting demolding device according to claim 1, characterized in that, The rotating plate (19) is driven to rotate by a third drive source. A fixed column (20) is fixedly installed at one end of the rotating plate (19). A lifting rod (22) is slidably installed inside the fixed column (20). The lifting rod (22) is driven to rise and fall by a fourth drive source built into the fixed column (20). A rotating disk (21) is provided at the top of the lifting rod (22). An outer annular cotton (25) is fixedly installed at the top of the rotating disk (21). An infusion tube (26) is fixedly installed on the third bracket (103). 26) Connected to the external liquid supply equipment, in the initial state of the rotating plate (19), the fixed column (20) is located below the third support (103). At this time, the infusion pipe (26) faces the outer ring cotton (25). The infusion pipe (26) delivers the release agent to the outer ring cotton (25). When the lifting frame (6) rises, the third drive source drives the rotating plate (19) to rotate so that the fixed column (20) is located below the cylinder (4). The fourth drive source drives the lifting rod (22) to rise. At this time, the outer circle of the outer ring cotton (25) slides with the inner wall of the cylinder (4).

5. The aluminum alloy casting demolding device according to claim 4, characterized in that, The rotating disk (21) is fixedly installed with an inner ring cotton (24), which is located inside the outer ring cotton (25). The inner wall of the inner ring cotton (24) slides with the outer surface of the top rod (5). There are two infusion tubes (26). One infusion tube (26) delivers the release agent to the outer ring cotton (25), and the other infusion tube (26) delivers the lubricating oil to the inner ring cotton (24).

6. The aluminum alloy casting demolding device according to claim 5, characterized in that, An annular piece (23) is fixedly installed on the top of the rotating disk (21), and the annular piece (23) is located between the inner annular cotton (24) and the outer annular cotton (25).

7. A demolding device for aluminum alloy castings according to claim 6, characterized in that, The rotating disk (21) is rotatably mounted on the top of the lifting rod (22), and the rotating wheel (27) is rotatably mounted on the third bracket (103). The rotating wheel (27) is driven to rotate by the stepper motor (28) fixedly mounted on the third bracket (103). In the initial state, the outer surface of the rotating disk (21) abuts against the outer surface of the rotating wheel (27).

8. A method for demolding aluminum alloy castings, characterized in that, The method is applied to a demolding device for aluminum alloy castings as described in any one of claims 1-7, and the method includes the following steps: Step S1: Molten aluminum alloy is injected into the cylinder (4), cooled and solidified to form an aluminum alloy rod. At this time, the device is in the initial state, the rotary motor (2) is stopped, the rotating column (3) is vertically arranged, the cylinder (4) is open and facing upward, the top rod (5) is stored at the bottom of the rotating column (3), the lifting frame (6) is in the low position of the second support (102), the ring (7) and the annular tube (8) are misaligned and separated from the cylinder (4), and the striking component and the heat exchanger (11) are in standby state. Step S2: Start the rotary motor (2) to drive the rotating column (3) to rotate 180 degrees, and drive the cylinder (4) to rotate synchronously until the opening is vertically downward, and keep the cylinder (4) coaxial with the ring (7) and the annular tube (8) to complete the demolding station switching; Step S3: Start the second drive source to drive the lifting frame (6) to rise, so that the ring (7) is fitted on the outside of the cylinder (4), and the ring (7), the annular tube (8) and the outer wall of the cylinder (4) are kept in a gap. Start the heat exchanger (11), and the cooling water flows into the annular tube (8) through the water inlet pipe (9). After absorbing the residual heat of the bar and the cylinder (4), it flows back through the drain pipe (10). The adhesion between the bar and the inner wall of the cylinder (4) is weakened by the principle of thermal expansion and contraction, and the demolding resistance is reduced. Step S4: After cooling is complete, start the striking component at the top of the ring (7) to strike the outer wall of the cylinder (4) evenly and intermittently. The vibration breaks up the adhesive structure between the rod and the cylinder (4), so as to achieve flexible loosening of the rod and avoid damage to the parts and defects of the rod caused by hard pushing. Step S5: After the bar is released, start the first drive source to drive the push rod (5) to move and push the bar out of the cylinder (4) to complete the discharge.

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