A magnetic rubber product injection molding process and its molding device

Abstract

This invention discloses an injection molding process and apparatus for magnetic rubber products, relating to the field of magnetic rubber product injection molding technology. The magnetic rubber product injection molding apparatus includes: a worktable; during equipment operation, it achieves stable pushing and conveying of magnetic rubber material inside a heating cylinder; and is equipped with an extrusion block, L-shaped block, semi-circular block, spring sheet, transmission rod, piston plate, air inlet pipe, and air outlet pipe to continuously inject gas into the internal cavity of a copper sheet. Based on the principle of gas compression and heat generation, the temperature of the gas inside the cavity rises rapidly after compression, thereby causing the entire copper sheet to heat up synchronously. This allows for all-round heating of the magnetic rubber raw material flowing inside the feed pipe, effectively compensating for the heat loss during the feeding and conveying process of the raw material. It completely solves the problems of heat loss and sudden temperature drop during raw material conveying in traditional equipment, and avoids the situation where the viscosity of the magnetic rubber material increases significantly and its fluidity deteriorates due to cooling.

Description

Technical Field

[0001] This invention relates to the field of magnetic rubber product injection molding technology, specifically to a magnetic rubber product injection molding process and molding apparatus. Background Technology

[0002] Magnetic rubber products are functional rubber-plastic products made by doping magnetic powder into conventional rubber base materials. They combine the excellent elasticity and sealing properties of rubber with the magnetic adsorption properties of magnetic materials, and are widely used in many fields such as electronic equipment, precision instruments, smart homes, and sealed transmission. At present, magnetic rubber products are mostly mass-produced using injection molding. The molten and mixed magnetic rubber material is injected into the mold cavity through an injection device, and the finished product is obtained after vulcanization and cooling. This process has the advantages of high molding efficiency, good product consistency, and adaptability to the production of complex shapes, and is the mainstream production process for magnetic rubber products at present.

[0003] Existing magnetic rubber injection molding equipment suffers from problems. Due to the presence of a large amount of magnetic powder in the magnetic rubber material, it has a higher overall viscosity and poorer flowability compared to ordinary rubber materials, exhibiting significant viscous characteristics. Conventional molding equipment relies solely on the front-end heating cylinder to heat and plasticize the raw material. During the process of the material being transported from the heating cylinder to the feed pipe and flowing into the stationary mold cavity, heat is rapidly dissipated, causing the material temperature to drop and the viscosity to increase further. This increased viscosity directly leads to slow feed flow rate and uneven feeding, which not only significantly reduces the production efficiency of injection molding but also easily results in incomplete feeding into the mold cavity, and molding defects such as voids, material shortages, and uneven texture in the product. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an injection molding process and apparatus for magnetic rubber products, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a magnetic rubber product injection molding device, comprising: a worktable, a control panel fixed on the front of the worktable, a fixed seat fixed on the top of the worktable, a stationary mold fixed on the top of the fixed seat, a movable mold slidably mounted on the top of the fixed seat, and a cylinder detachably mounted on the top of the worktable, the output end of the cylinder being fixedly connected to the side wall of the movable mold. An injection assembly is disposed on the top of a worktable. The injection assembly includes: a support, a heating cylinder, a motor, a rotating rod, an auger, and a feed pipe. The support is fixed to the top of the worktable, the heating cylinder is fixed to the outer wall of the support, a feed cover is fixed to the top of the heating cylinder, the motor is fixed to the side wall of the heating cylinder, the rotating rod is fixed to the output end of the motor, the auger is fixed to the outer wall of the rotating rod, and the feed pipe is fixed to the side wall of the heating cylinder. The end of the feed pipe away from the heating cylinder is fixed to a stationary mold. An air storage tank is fixed to the top of the support, and a compression block is fixed to the outer wall of the rotating rod; An L-shaped block, the L-shaped block passing through the top of the heating cylinder and the gas storage tank, and slidingly connected at the passage, a semi-circular block fixed to the bottom of the L-shaped block, a spring sheet fixed to the outer wall of the L-shaped block, and the bottom of the spring sheet fixed to the top of the gas storage tank; A transmission rod is fixed to the outer wall of the L-shaped block. A piston plate is slidably installed on the inner side of the air storage box. The top of the piston plate is fixedly connected to the bottom of the transmission rod. An air inlet pipe is fixed on the left side of the air storage box, and an air outlet pipe is fixed on the bottom of the air storage box. One-way valves are provided at the air inlet pipe and the air outlet pipe. A copper sheet is fixed to the outer wall of the feed pipe. A cavity is formed on the copper sheet. The bottom of the vent pipe is fixed to the top of the copper sheet and the vent pipe is connected to the inside of the copper sheet. The copper sheet is used to heat the feed pipe.

[0006] According to the above technical solution, a movable block is slidably installed on the side wall of the heating cylinder, an inclined groove is opened on the side wall of the movable block, a bending block is fixed on the side wall of the L-shaped block, and an extrusion rod is fixed on the side wall of the bending block. The end of the extrusion rod is in contact with the inner wall of the inclined groove.

[0007] According to the above technical solution, a striking block is fixed to the side wall of the moving block. The striking block is used to strike the outer wall of the feed pipe to remove air bubbles from the material in the feed pipe.

[0008] According to the above technical solution, a cooling device is provided on the copper sheet, which is used to cool the stationary mold to facilitate demolding. A clamping device is provided on the stationary mold.

[0009] According to the above technical solution, the cooling device includes: a flow rate sensor, which is fixed at the top of the feed pipe and the probe of the flow rate sensor extends into the feed pipe; a thin tube is fixed at the top of the copper sheet, which communicates with the inside of the copper sheet, and the diameter of the thin tube is smaller than the diameter of the outlet pipe; a solenoid valve is fixed on the outer wall of the thin tube; the flow rate sensor is electrically connected to the control panel; and the control panel is electrically connected to the solenoid valve. A thick tube is fixed to the top of a thin tube. The end of the thick tube away from the thin tube is fixed to the top of a stationary mold. A cooling groove is provided on the stationary mold. The thick tube is connected to the cooling groove, and cold air can be discharged into the cooling groove through the thick tube. A push block is fixed to the side wall of the moving mold.

[0010] According to the above technical solution, an exhaust pipe is fixed to the side wall of the stationary mold, and the exhaust pipe is connected to the cooling tank. A sealing block is slidably installed on the side wall of the stationary mold, and a connecting spring is fixed to the outer wall of the sealing block. The end of the connecting spring is fixed to the inner side of the outer wall of the stationary mold. The sealing block is used to block the exhaust pipe, so that the cold air stays in the cooling tank for a longer time.

[0011] According to the above technical solution, the clamping device includes: a transmission spring, the bottom of which is fixed to the inner side of the top of the stationary mold, and a bending rod is slidably installed on the inner side of the top of the stationary mold; A sliding rod is slidably mounted on the inside of a bent rod, and a compression spring is fixed to the top of the sliding rod, with the top of the compression spring fixed to the inside of the bent rod. A fixing plate is fixed to the bottom of the slide bar, and a pressure roller is rotatably installed on the inner side of the fixing plate.

[0012] According to the above technical solution, a long plate is fixed to the outer wall of the bending rod, a connecting plate is fixed to the bottom of the long plate, an oblique hole is opened on the outer wall of the connecting plate, a push rod is fixed to the outer wall of the sealing block, and the end of the push rod is in contact with the inner wall of the oblique hole.

[0013] An injection molding process for magnetic rubber products, comprising the following steps: Step 1: During the molding process, the cylinder is activated to move the moving mold closer to the stationary mold, so that the punch of the moving mold is inserted into the cavity of the stationary mold. Step 2: The raw material injected into the heating cylinder is heated through the feed hood. By starting the motor, the rotating rod can be driven to rotate, thereby rotating the auger. The auger pushes the raw material towards the feed tube, and the feed tube injects the raw material into the mold cavity. Step 3: After the raw material injection is completed, the molding operation can be carried out through the moving mold and the stationary mold. After molding, the cylinder is activated to move the moving mold away from the stationary mold, so that the molded material is exposed for demolding.

[0014] This invention provides an injection molding process and apparatus for magnetic rubber products. It offers the following advantages: 1. During equipment operation, this invention relies on a rotating rod to drive the auger to rotate continuously, achieving stable pushing and conveying of magnetic rubber material inside the heating cylinder. Simultaneously, the matching extrusion block, L-shaped block, semi-circular block, spring plate, transmission rod, piston plate, inlet pipe, and outlet pipe continuously and uninterruptedly inject gas into the internal cavity of the copper sheet. Under continuous operation, gas accumulates inside the copper sheet. Even when the internal gas filling approaches saturation, gas continues to be supplied to the copper sheet. The continuously entering gas compresses and pressurizes the existing gas within the copper sheet cavity. Based on the principle of gas compression generating heat, the temperature of the gas inside the cavity rises rapidly after compression, causing the entire copper sheet to heat up synchronously. This heats and compensates for the magnetic rubber material flowing inside the feed pipe, effectively making up for the heat loss during feeding and conveying. It completely solves the problems of heat loss and sudden temperature drops during material conveying in traditional equipment, preventing a significant increase in viscosity and decreased fluidity of the magnetic rubber material due to cooling.

[0015] 2. This invention performs de-air bubble removal simultaneously with the feeding and conveying operation of the equipment. By incorporating bending blocks, moving blocks, extrusion rods, and striking blocks, the feed pipe experiences high-frequency, micro-amplitude vibration. Through vibration transmission, the vibrational force is transferred to the magnetic rubber material flowing inside the feed pipe, effectively breaking up tiny air bubbles generated during material mixing and conveying, achieving real-time de-air bubble removal. This effectively prevents a large number of air bubbles from remaining inside the raw material, preventing quality problems such as porosity, voids, looseness, surface defects, and non-dense structure in the molded magnetic rubber products due to excessive air content and residual air bubbles in the raw material during subsequent injection molding.

[0016] 3. This invention, through the installation of a flow rate sensor, a thin tube, a solenoid valve, a thick tube, a cooling tank, and an exhaust pipe, allows the flow rate sensor to send an electrical signal to the control panel after injection when it can no longer detect the raw material flow signal. The control panel then opens the solenoid valve, releasing the blockage of the thin tube. At this point, the high-pressure gas stored inside the copper plate cavity can be rapidly discharged through the thin tube. Based on the Venturi principle, the gas velocity increases sharply and the pressure decreases rapidly as it flows through the narrow channel of the thin tube, achieving instantaneous depressurization, expansion, and cooling. The cooled gas then flows into the thick tube and is quickly introduced into the cooling tank inside the stationary mold. The low-temperature gas can fully exchange heat with the mold cavity wall, providing rapid and uniform cooling of the molded raw material and the mold from all directions. This rapid cooling accelerates the solidification of the magnetic rubber material inside the mold, shortens the material cooling and molding cycle, and reduces the adhesion between the product and the mold cavity, greatly facilitating subsequent demolding and effectively improving production efficiency.

[0017] 4. By incorporating an exhaust pipe, a sealing block, a pusher block, and a connecting spring, this invention allows the pusher block to press and move the sealing block when the moving mold and the stationary mold are in contact, thus blocking the exhaust pipe. This allows the cold air to remain in the cooling tank for a longer period when the thicker pipe discharges cold air into the cooling tank. Furthermore, after molding is complete, the moving mold moves away from the stationary mold, and the connecting spring allows the sealing block to return to its original position, preventing it from blocking the exhaust pipe. This allows the used gas in the cooling tank to be discharged, facilitating the next discharge of cold air.

[0018] 5. This invention, through the arrangement of components such as a bending rod, transmission spring, long plate, connecting plate, push rod, clamping spring, sliding rod, fixed plate, and clamping roller, ensures that during operation, when the moving mold needs to be bonded to the stationary mold, the push block squeezes the sealing block and causes it to move. This, in turn, allows the sealing block to drive the sliding rod to slide stably in the inclined hole. This sliding action further drives the long plate and fixed plate to move downwards synchronously, thus ensuring that the clamping roller tightly presses against the moving mold. Throughout the bonding and molding process between the moving and stationary molds, reliable clamping and positioning of the moving mold is achieved, preventing displacement or skewing during bonding and ensuring stable and reliable mold bonding. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the internal structure of the heating cylinder of the present invention; Figure 4 This is a partial structural diagram of the present invention; Figure 5 For the present invention Figure 3 Enlarged schematic diagram of structure A; Figure 6 This is a schematic diagram of the pressing device structure of the present invention.

[0020] In the diagram: 1. Workbench; 2. Control panel; 3. Fixed base; 4. Static mold; 5. Moving mold; 6. Cylinder; 7. Bracket; 8. Heating cylinder; 9. Motor; 10. Rotating rod; 11. Screwdriver; 12. Feed pipe; 13. Air tank; 14. Extrusion block; 15. L-shaped block; 16. Semicircular block; 17. Spring plate; 18. Transmission rod; 19. Piston plate; 20. Air inlet pipe; 21. Air outlet pipe; 22. Copper sheet; 23. Bending block; 24. Moving block 25. Extrusion rod; 26. Striking block; 301. Flow sensor; 302. Thin tube; 303. Solenoid valve; 304. Thick tube; 305. Cooling tank; 306. Exhaust pipe; 307. Sealing block; 308. Push block; 309. Connecting spring; 401. Bending rod; 402. Transmission spring; 403. Long plate; 404. Connecting plate; 405. Push rod; 406. Compression spring; 407. Slide rod; 408. Fixing plate; 409. Compression roller. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-6 One embodiment of the present invention is: a magnetic rubber product injection molding device, comprising: a worktable 1, an air storage box 13, an L-shaped block 15, a transmission rod 18 and a copper sheet 22; a control panel 2 is fixed on the front of the worktable 1, a fixed seat 3 is fixed on the top of the worktable 1, a stationary mold 4 is fixed on the top of the fixed seat 3, a movable mold 5 is slidably installed on the top of the fixed seat 3, and a cylinder 6 is detachably installed on the top of the worktable 1, the output end of the cylinder 6 being fixedly connected to the side wall of the movable mold 5; The injection assembly is located on the top of the workbench 1. The injection assembly includes: a support 7, a heating cylinder 8, a motor 9, a rotating rod 10, an auger 11, and a feed pipe 12. The support 7 is fixed to the top of the workbench 1, the heating cylinder 8 is fixed to the outer wall of the support 7, a feed cover is fixed to the top of the heating cylinder 8, the motor 9 is fixed to the side wall of the heating cylinder 8, the rotating rod 10 is fixed to the output end of the motor 9, the auger 11 is fixed to the outer wall of the rotating rod 10, and the feed pipe 12 is fixed to the side wall of the heating cylinder 8. The end of the feed pipe 12 away from the heating cylinder 8 is fixed to the stationary mold 4. The gas storage tank 13 is fixed to the top of the bracket 7. A compression block 14 is fixed to the outer wall of the rotating rod 10. An L-shaped block 15 passes through the top of the heating cylinder 8 and the gas storage tank 13, and is slidably connected at the point of penetration. A semi-circular block 16 is fixed to the bottom of the L-shaped block 15. A spring plate 17 is fixed to the outer wall of the L-shaped block 15, and the bottom of the spring plate 17 is fixed to the top of the gas storage tank 13. A transmission rod 18 is fixed to the outer wall of the L-shaped block 15. A piston plate 19 is slidably installed on the inner side of the gas storage tank 13, and the top of the piston plate 19 is fixedly connected to the bottom of the transmission rod 18. An air inlet pipe 20 is fixed to the left side of the gas storage tank 13, and an air outlet pipe 21 is fixed to the bottom of the gas storage tank 13. The air inlet pipe 20 and the air outlet pipe 21 are connected at... A one-way valve is provided. A copper sheet 22 is fixed to the outer wall of the feed pipe 12. A cavity is opened on the copper sheet 22. The bottom of the air outlet pipe 21 is fixed to the top of the copper sheet 22 and the air outlet pipe 21 is connected to the inside of the copper sheet 22. The copper sheet 22 is used to heat the feed pipe 12. A moving block 24 is slidably installed on the side wall of the heating cylinder 8. A slanted groove is opened on the side wall of the moving block 24. A bending block 23 is fixed on the side wall of the L-shaped block 15. A pressing rod 25 is fixed on the side wall of the bending block 23. The end of the pressing rod 25 is in contact with the inner wall of the slanted groove. A striking block 26 is fixed on the side wall of the moving block 24. The striking block 26 is used to strike the outer wall of the feed pipe 12 to remove air bubbles from the material in the feed pipe 12.

[0023] During equipment operation, the rotating rod 10 drives the auger 11 to rotate continuously, achieving stable pushing and conveying of the magnetic rubber material inside the heating cylinder 8. While the rotating rod 10 rotates, the matching extrusion block 14, L-shaped block 15, semi-circular block 16, spring plate 17, transmission rod 18, piston plate 19, air inlet pipe 20, and air outlet pipe 21 continuously and uninterruptedly inject gas into the internal cavity of the copper sheet 22. Under continuous operation, the gas inside the copper sheet 22 continuously accumulates. When the internal gas filling approaches saturation, the system continues to inject gas into the copper sheet 22. Gas is continuously introduced into the copper sheet 22, which will compress and pressurize the original gas in the cavity of the copper sheet 22. According to the principle of gas compression generating heat, the temperature of the gas inside the cavity rises rapidly after being compressed, thereby causing the entire copper sheet 22 to heat up synchronously. This can provide all-round and continuous constant temperature heating compensation for the magnetic rubber material flowing inside the feed pipe 12, effectively making up for the heat lost by the material during the feeding and conveying process. This completely solves the problem of heat loss and sudden temperature drop during the material conveying process of traditional equipment, and avoids the situation where the viscosity of the magnetic rubber material increases significantly and the fluidity deteriorates due to cooling. During the simultaneous feeding and conveying operation of the equipment, a de-bubbling process is performed. This is achieved by using a bending block 23, a moving block 24, an extrusion rod 25, and a striking block 26 to induce high-frequency, micro-amplitude vibration in the feed pipe 12. Through vibration transmission, the vibrational force is transferred to the magnetic rubber material flowing inside the feed pipe 12, effectively breaking up tiny air bubbles generated during material mixing and conveying, thus achieving real-time de-bubbling. This effectively prevents a large number of air bubbles from remaining inside the material, preventing quality problems such as porosity, voids, looseness, surface defects, and non-dense structure in the molded magnetic rubber products due to excessive air content and residual air bubbles in the material during subsequent injection molding.

[0024] An injection molding process for magnetic rubber products, comprising the following steps: Step 1: During the molding operation, the cylinder 6 is activated to move the moving mold 5 closer to the stationary mold 4, so that the punch of the moving mold 5 is inserted into the mold cavity of the stationary mold 4. Step 2: The raw material injected into the heating cylinder 8 is heated through the feeding hood. By starting the motor 9, the rotating rod 10 can be rotated, thereby rotating the auger 11. The auger 11 pushes the raw material to the feeding pipe 12, so that the feeding pipe 12 injects the raw material into the mold cavity. Step 3: After the raw material injection is completed, the molding operation can be carried out through the moving mold 5 and the stationary mold 4. After molding, the moving mold 5 is moved away from the stationary mold 4 by activating the cylinder 6, so that the molded material is exposed for demolding.

[0025] In this embodiment, during operation: when raw material is injected into the stationary mold 4 through the feed pipe 12, the rotating rod 10 rotates, causing the extrusion block 14 to rotate. When the extrusion block 14 rotates to contact the bottom of the semi-circular block 16, it causes the extrusion block 14 to press the semi-circular block 16 upward. When the semi-circular block 16 moves upward, it causes the L-shaped block 15 to move upward. When the L-shaped block 15 moves upward, it causes the spring sheet 17 to stretch and deform. Simultaneously, when the L-shaped block 15 moves upward, it causes the transmission rod 18 to move upward, thereby causing the transmission rod 18 to drive the piston plate 19 upward. Because the outer walls of the air inlet pipe 20 and the air outlet pipe 21 are both equipped with one-way valves, and the one-way valve on the outer wall of the air inlet pipe 20 allows the air inlet pipe 20 to only allow air to enter and not exit, and the one-way valve on the air outlet pipe 21 allows the air outlet pipe 21 to only allow air to exit and not enter the air storage tank 13, when the piston plate 19 moves upward, it can... External gas is drawn into the gas storage tank 13 through the air inlet pipe 20. When the extrusion block 14 rotates to a position where it does not contact the semicircular block 16, the spring plate 17 is in a stretched and deformed state, which allows the spring plate 17 to drive the L-shaped block 15 to return to its original position. When the L-shaped block 15 returns to its original position, it can drive the transmission rod 18 to move downward, which in turn drives the piston plate 19 to move downward. This allows the gas in the gas storage tank 13 to be squeezed into the cavity of the copper sheet 22 through the air outlet pipe 21. When the rotating rod 10 rotates, the piston plate 19 continuously injects gas into the copper sheet 22. When the copper sheet 22 is full of gas, continuing to inject air into the copper sheet 22 will pressurize the gas in the copper sheet 22. The pressurized gas will generate heat, which will raise the temperature of the copper sheet 22. The heated copper sheet 22 will then heat the feed pipe 12, thereby heating the raw material flowing through the feed pipe 12 and preventing heat loss during the flow of the raw material. When the L-shaped block 15 moves upward, it drives the bending block 23 to move upward. When the bending block 23 moves upward, it drives the extrusion rod 25 to move upward, thereby causing the extrusion rod 25 to extrude the inclined groove. This causes the inner side of the inclined groove to be subjected to extrusion force, which in turn drives the moving block 24 to move towards the feed pipe 12. The moving block 24 then drives the striking block 26 to move, causing the striking block 26 to strike the outer wall of the feed pipe 12, causing the outer wall of the feed pipe 12 to vibrate and remove air bubbles from the raw material in the feed pipe 12. When the L-shaped block 15 moves downward, it drives the bending block 23 to move downward, causing the extrusion rod 25 to extrude the moving block 24 away from the feed pipe 12, and causing the striking block 26 to move away from the feed pipe 12 for the next striking operation.

[0026] Please see Figures 1-6 Based on the above embodiments, in another embodiment of the present invention, a cooling device is provided on the copper sheet 22. The cooling device is used to cool the static mold 4 to facilitate demolding. The cooling device includes: a flow rate sensor 301, a thin tube 302, a solenoid valve 303, a thick tube 304, a cooling tank 305, an exhaust pipe 306, a sealing block 307, a push block 308, and a connecting spring 309. The flow rate sensor 301 is fixed to the top of the feed pipe 12, and the probe of the flow rate sensor 301 extends into the feed pipe 12. The thin tube 302 is fixed to the top of the copper sheet 22, and the thin tube 302 communicates with the inside of the copper sheet 22. The diameter of the thin tube 302 is smaller than the diameter of the exhaust pipe 21. The solenoid valve 303 is fixed to the outer wall of the thin tube 302. The flow rate sensor 301 is electrically connected to the control panel 2, and the control panel 2 is electrically connected to the solenoid valve 303. The thick tube 304 is fixed to the top of the thin tube 302. The thick pipe 304, with one end away from the thin pipe 302, is fixed to the top of the stationary mold 4. The stationary mold 4 has a cooling groove 305. The thick pipe 304 is connected to the cooling groove 305, allowing cold air to be discharged into the cooling groove 305 through the thick pipe 304. A push block 308 is fixed to the side wall of the moving mold 5. An exhaust pipe 306 is fixed to the side wall of the stationary mold 4, and the exhaust pipe 306 is connected to the cooling groove 305. A sealing block 307 is slidably installed on the side wall of the stationary mold 4. A connecting spring 309 is fixed to the outer wall of the sealing block 307, and the end of the connecting spring 309 is fixed to the inner side of the outer wall of the stationary mold 4. The sealing block 307 is used to block the exhaust pipe 306, allowing the cold air to stay in the cooling groove 305 for a longer time.

[0027] By configuring a flow rate sensor 301, a thin tube 302, a solenoid valve 303, a thick tube 304, a cooling tank 305, and an exhaust pipe 306, when the injection operation stops, the solenoid valve 303 opens, releasing the blockage limit of the thin tube 302. At this time, the high-pressure gas stored inside the cavity of the copper sheet 22 can be quickly discharged outward through the thin tube 302. Based on the Venturi principle, the gas velocity increases sharply and the gas pressure decreases rapidly when flowing through the narrow channel of the thin tube 302, achieving instantaneous depressurization, expansion, and cooling of the gas. The cooled low-temperature gas then flows into the interior of the thick tube 304 and is quickly introduced into the cooling tank 305 inside the stationary mold 4. The low-temperature gas can fully exchange heat with the cavity wall of the stationary mold 4, providing rapid and uniform cooling of the molded raw material and the mold from all directions. Rapid cooling can accelerate the shaping and curing speed of the magnetic rubber material inside the mold, shorten the material cooling and molding cycle, and reduce the adhesion between the product and the mold cavity, greatly facilitating subsequent demolding operations and effectively improving production efficiency. By setting up an exhaust pipe 306, a sealing block 307, a push block 308, and a connecting spring 309, when the moving mold 5 and the stationary mold 4 are in contact, the push block 308 will press the sealing block 307 to move, causing the sealing block 307 to block the exhaust pipe 306. This allows the cold air to stay in the cooling tank 305 for a longer time when the thick pipe 304 discharges cold air into the cooling tank 305. After molding is completed, the moving mold 5 will move away from the stationary mold 4, and the connecting spring 309 can reset the sealing block 307, preventing it from blocking the exhaust pipe 306. This allows the used gas in the cooling tank 305 to be discharged, facilitating the discharge of cold air next time.

[0028] A clamping device is provided on the stationary mold 4, which includes: a bending rod 401, a transmission spring 402, a long plate 403, a connecting plate 404, a push rod 405, a clamping spring 406, a slide rod 407, and a fixing plate 408. The bottom of the transmission spring 402 is fixed to the inner top of the stationary mold 4. The bending rod 401 is slidably installed on the inner top of the stationary mold 4. The slide rod 407 is slidably installed on the inner side of the bending rod 401. The top of the slide rod 407 is fixed with a clamping spring. Spring 406, the top of the compression spring 406 is fixed to the inner side of the bending rod 401, the fixing plate 408 is fixed to the bottom of the slide rod 407, and the inner side of the fixing plate 408 is rotatably mounted with a pressure roller 409; the outer wall of the bending rod 401 is fixed with a long plate 403, the bottom of the long plate 403 is fixed with a connecting plate 404, the outer wall of the connecting plate 404 is provided with an oblique hole, and the outer wall of the sealing block 307 is fixed with a push rod 405, the end of the push rod 405 is in contact with the inner wall of the oblique hole.

[0029] By setting up a series of components such as a bending rod 401, a transmission spring 402, a long plate 403, a connecting plate 404, a push rod 405, a clamping spring 406, a sliding rod 407, a fixed plate 408, and a clamping roller 409, the moving mold 5 can be bonded to the stationary mold 4 during operation. The push block 308 will squeeze the sealing block 307 and cause it to move. The sealing block 307 can then drive the sliding rod 407 to slide stably in the inclined hole. This sliding action further drives the long plate 403 and the fixed plate 408 to move downward synchronously, so that the clamping roller 409 is tightly pressed against the moving mold 5. During the entire bonding and molding process of the moving mold 5 and the stationary mold 4, the moving mold 5 can be reliably clamped and positioned, preventing displacement or skewing of the moving mold 5 during the bonding and molding process, and ensuring stable and reliable mold bonding.

[0030] In this embodiment, during normal injection operation, magnetic rubber material continuously flows inside the feed pipe 12. The flow rate sensor 301 monitors the material flow rate signal inside the feed pipe 12 in real time and continuously transmits real-time monitoring data to the control panel 2. When the material injection and filling inside the stationary mold 4 is completed, and the feed pipe 12 stops conveying material into the stationary mold 4, the material flow inside the feed pipe 12 terminates. The flow rate sensor 301 can no longer detect the material flow signal and immediately sends a no-flow-rate feedback electrical signal to the control panel 2. After receiving the signal, panel 2 immediately controls the solenoid valve 303 to open, releasing the blockage limit of the thin tube 302. At this time, the high-pressure gas stored inside the cavity of copper sheet 22 can be quickly discharged outward through the thin tube 302. Through the Venturi principle, the gas flow velocity increases sharply and the gas pressure decreases rapidly when it flows through the narrow channel of the thin tube 302, realizing the instantaneous decompression expansion and cooling of the gas. The cooled low-temperature gas then flows into the interior of the thick tube 304 and is quickly introduced into the cooling tank 305 inside the stationary mold 4 through the thick tube 304 to perform cooling operation on the stationary mold 4. Once formed, the cylinder 6 can move the moving mold 5 away from the stationary mold 4, and also move the push block 308 away from the stationary mold 4. This prevents the push block 308 from pressing the sealing block 307. Furthermore, because the connecting spring 309 is in a stretched state, it causes the sealing block 307 to reset, preventing it from blocking the exhaust pipe 306 and allowing the exhaust pipe 306 to be exposed, thus venting the used gas from the cooling tank 305. When the moving mold 5 moves closer to the stationary mold 4, the push block 308 will press against the sealing block 307, further sealing the seal. When the sealing block 307 moves, it will stretch the connecting spring 309. When the sealing block 307 moves, it will block the exhaust pipe 306, so that when the thick pipe 304 adds cold gas to the cooling tank 305, the cold air will not be discharged from the exhaust pipe 306, and the cold air can stay in the cooling tank 305 for a longer time. When the raw material in the feed pipe 12 flows again for injection, the flow rate sensor 301 will sense the flow rate and transmit an electrical signal to the controller, which can then control the solenoid valve 303 to close. When the moving mold 5 approaches the stationary mold 4, the push block 308 will press the sealing block 307. When the sealing block 307 moves under the pressure, it can drive the slide rod 407 to move in the inclined hole, so that the inclined hole will be subjected to the pressure, which can drive the connecting plate 404 to move downward. When the connecting plate 404 moves downward, it can drive the long plate 403 to move downward, causing the bending rod 401 to move downward. The bending rod 401 can compress the transmission spring 402. When the bending rod 401 moves downward, it can drive the fixed plate 408 to move downward, so that the pressing roller 409 presses against the top of the moving mold 5, so that the moving mold 5 remains stable during the molding operation with the stationary mold 4.

[0031] 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. An injection molding apparatus for magnetic rubber products, characterized in that, include: A workbench (1) is provided with a control panel (2) fixed on the front side of the workbench (1), a fixed seat (3) fixed on the top of the workbench (1), a stationary mold (4) fixed on the top of the fixed seat (3), a moving mold (5) slidably mounted on the top of the fixed seat (3), and a cylinder (6) detachably mounted on the top of the workbench (1). The output end of the cylinder (6) is fixedly connected to the side wall of the moving mold (5). An injection assembly is set on the top of a workbench (1). The injection assembly includes: a bracket (7), a heating cylinder (8), a motor (9), a rotating rod (10), an auger (11), and a feed pipe (12). The bracket (7) is fixed on the top of the workbench (1). The heating cylinder (8) is fixed on the outer wall of the bracket (7). A feed cover is fixed on the top of the heating cylinder (8). The motor (9) is fixed on the side wall of the heating cylinder (8). The rotating rod (10) is fixed on the output end of the motor (9). The auger (11) is fixed on the outer wall of the rotating rod (10). The feed pipe (12) is fixed on the side wall of the heating cylinder (8). One end of the feed pipe (12) away from the heating cylinder (8) is fixed on a stationary mold (4). Gas storage box (13), the gas storage box (13) is fixed on the top of the bracket (7), and the outer wall of the rotating rod (10) is fixed with a compression block (14). L-shaped block (15), the L-shaped block (15) penetrates the top of the heating cylinder (8) and the gas storage box (13), and is slidably connected at the penetration point. A semi-circular block (16) is fixed to the bottom of the L-shaped block (15), and a spring sheet (17) is fixed to the outer wall of the L-shaped block (15). The bottom of the spring sheet (17) is fixed to the top of the gas storage box (13). A transmission rod (18) is fixed to the outer wall of an L-shaped block (15). A piston plate (19) is slidably installed on the inner side of the gas storage box (13). The top of the piston plate (19) is fixedly connected to the bottom of the transmission rod (18). An air inlet pipe (20) is fixed on the left side of the gas storage box (13). An air outlet pipe (21) is fixed on the bottom of the gas storage box (13). One-way valves are provided at the air inlet pipe (20) and the air outlet pipe (21). A copper sheet (22) is fixed to the outer wall of the feed pipe (12). A cavity is provided on the copper sheet (22). The bottom of the air outlet pipe (21) is fixed to the top of the copper sheet (22), and the air outlet pipe (21) is connected to the inside of the copper sheet (22). The copper sheet (22) is used to heat the feed pipe (12).

2. The magnetic rubber product injection molding apparatus according to claim 1, characterized in that, The heating cylinder (8) has a sliding block (24) slidably installed on its side wall. The side wall of the sliding block (24) has an inclined groove. The side wall of the L-shaped block (15) has a bending block (23) fixed on it. The side wall of the bending block (23) has an extrusion rod (25) fixed on it. The end of the extrusion rod (25) is in contact with the inner wall of the inclined groove.

3. The magnetic rubber product injection molding apparatus according to claim 2, characterized in that, The side wall of the moving block (24) is fixed with a striking block (26), which is used to strike the outer wall of the feed pipe (12) to remove air bubbles from the material in the feed pipe (12).

4. The magnetic rubber product injection molding apparatus according to claim 3, characterized in that, A cooling device is provided on the copper sheet (22) to cool the stationary mold (4) for easy demolding. A pressing device is provided on the stationary mold (4).

5. The magnetic rubber product injection molding apparatus according to claim 4, characterized in that, The cooling device includes: a flow rate sensor (301), which is fixed at the top of the feed pipe (12) and the probe of the flow rate sensor (301) extends into the feed pipe (12); a thin tube (302) is fixed at the top of the copper sheet (22), which communicates with the inside of the copper sheet (22), and the diameter of the thin tube (302) is smaller than the diameter of the air outlet pipe (21); a solenoid valve (303) is fixed on the outer wall of the thin tube (302); the flow rate sensor (301) is electrically connected to the control panel (2); and the control panel (2) is electrically connected to the solenoid valve (303). A thick tube (304) is fixed to the top of a thin tube (302). The end of the thick tube (304) away from the thin tube (302) is fixed to the top of a stationary mold (4). A cooling groove (305) is provided on the stationary mold (4). The thick tube (304) is connected to the cooling groove (305). Cold air can be discharged into the cooling groove (305) through the thick tube (304). A push block (308) is fixed to the side wall of the moving mold (5).

6. The magnetic rubber product injection molding apparatus according to claim 5, characterized in that, An exhaust pipe (306) is fixed to the side wall of the stationary mold (4). The exhaust pipe (306) is connected to the cooling tank (305). A sealing block (307) is slidably installed on the side wall of the stationary mold (4). A connecting spring (309) is fixed to the outer wall of the sealing block (307). The end of the connecting spring (309) is fixed to the inner side of the outer wall of the stationary mold (4). The sealing block (307) is used to block the exhaust pipe (306) so that the cold air stays in the cooling tank (305) for a longer time.

7. The magnetic rubber product injection molding apparatus according to claim 6, characterized in that, The clamping device includes: a transmission spring (402), the bottom of which is fixed to the inner side of the top of the stationary mold (4), and a bending rod (401) is slidably installed on the inner side of the top of the stationary mold (4). A slide rod (407) is slidably mounted on the inner side of a bent rod (401). A compression spring (406) is fixed to the top of the slide rod (407). The top of the compression spring (406) is fixed to the inner side of the bent rod (401). A fixing plate (408) is fixed to the bottom of the slide bar (407), and a pressure roller (409) is rotatably installed on the inner side of the fixing plate (408).

8. The magnetic rubber product injection molding apparatus according to claim 7, characterized in that, The outer wall of the bent rod (401) is fixed with a long plate (403), the bottom of the long plate (403) is fixed with a connecting plate (404), the outer wall of the connecting plate (404) is provided with an oblique hole, the outer wall of the sealing block (307) is fixed with a push rod (405), and the end of the push rod (405) is in contact with the inner wall of the oblique hole.

9. A magnetic rubber product injection molding process, based on the magnetic rubber product injection molding apparatus according to any one of claims 1-8, characterized in that, The injection molding process includes the following steps: Step 1: During the molding operation, the cylinder (6) is started to move the moving mold (5) closer to the stationary mold (4), so that the punch of the moving mold (5) is inserted into the mold cavity of the stationary mold (4); Step 2: The raw material injected into the heating cylinder (8) is heated through the feed hood. By starting the motor (9), the rotating rod (10) can be driven to rotate, thereby causing the auger (11) to rotate. The auger (11) pushes the raw material to the feed pipe (12), and the feed pipe (12) injects the raw material into the mold cavity. Step 3: After the raw material injection is completed, the molding operation can be carried out through the moving mold (5) and the stationary mold (4). After molding, the moving mold (5) is moved away from the stationary mold (4) by starting the cylinder (6), so that the molded material is exposed and demolding is carried out.

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