Plastic package material preheating device

Abstract

The invention relates to the technical field of semiconductor processing equipment, in particular to a plastic package material preheating device which comprises a tank body, an electric heating pipe is installed in the tank body, a preheating cylinder is installed in the tank body, a cover body is hinged to the top end of the tank body, and a stirring mechanism is arranged in the preheating cylinder. The stirring mechanism comprises a rotating shaft rotating in the preheating cylinder, a vent groove is formed in the rotating shaft, and a stirring rod is rotationally arranged in the vent groove. The rotating shaft drives an eccentric wheel to enable a piston to push nitrogen to be sprayed out through a through hole of a stirring piece, so that the plastic packaging material is prevented from being oxidized and degraded, and the nitrogen transfers heat and is matched with the stirring piece to make the temperature uniform; the pressure intensity in the cylinder is increased through nitrogen, stirring blades are driven to synchronously revolve and rotate, the preheating efficiency is improved, meanwhile, fan blades are driven by a rotating shaft to suck the nitrogen and form spiral airflow, the heat conduction efficiency is improved in combination with fixed airflow, nitrogen is recycled, and energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] This invention relates to the field of semiconductor processing equipment technology, and in particular to a molding compound preheating device. Background Technology

[0002] Semiconductors are materials whose conductivity at room temperature is between that of conductors and insulators. Semiconductors are used in integrated circuits, consumer electronics, communication systems, photovoltaic power generation, lighting, high-power power conversion and other fields. For example, diodes are devices made of semiconductors. The use of semiconductor chips can directly or indirectly improve the energy efficiency of other components in the system. In the entire process of energy transfer and use, semiconductor chips can usually play a role in monitoring, regulating, optimizing and controlling, which can reduce energy waste.

[0003] However, existing devices cannot completely remove air from the preheating cylinder during the process of adding molding compound to the preheating cylinder. This results in residual oxygen coming into direct contact with the molding compound. At the preheating temperature, the oxygen accelerates the oxidative degradation reaction of the polymer in the molding compound, severely reducing the performance of the molding compound.

[0004] In view of this, this paper studies and improves the existing problems, and provides a preheating device for molding compound, aiming to solve the problems and improve the practical value through this technology. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and propose a preheating device for molding compound. This invention uses a rotating shaft to drive an eccentric wheel, which in turn drives a piston to push nitrogen gas through the through-hole of a stirring plate, thus preventing the molding compound from oxidizing and degrading. The nitrogen gas transfers heat and, together with the stirring plate, ensures uniform temperature and improves preheating efficiency. The nitrogen gas increases the pressure inside the cylinder, causing the stirring plate to rotate synchronously, further improving preheating efficiency. At the same time, the rotating shaft drives the fan blades to draw in nitrogen gas and form a spiral airflow, which, combined with a fixed airflow, improves heat transfer efficiency. The nitrogen gas is recycled, making it energy-saving and environmentally friendly.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a preheating device for molding compound, comprising a tank, an electric heating tube installed inside the tank, a preheating cylinder installed inside the tank, and a cover hinged to the top of the tank; The preheating cylinder is equipped with a stirring mechanism, which includes a rotating shaft that rotates inside the preheating cylinder. The rotating shaft has a ventilation groove inside, and a stirring rod rotates inside the ventilation groove. A stirring blade is installed on the outer wall of the stirring rod. The tank is equipped with an inflation mechanism at the bottom of its interior. The inflation mechanism includes an air storage plate installed at the bottom of the tank. The preheating cylinder is equipped with a cylinder at its bottom. An air supply pipe A is connected between the air storage plate and the cylinder. An air extraction component is provided on one side of the air supply pipe A. The interior of the air storage plate is connected to the interior of the ventilation groove. Multiple sets of heat conduction pipes are installed at the top of the air storage plate. The cylinder is equipped with an adjustment mechanism for the tilting stirring rod; The tank body is provided with a circulation mechanism on its side wall. The circulation mechanism includes a shell installed on the side wall of the tank body. A drive shaft rotates inside the shell. A fan blade is installed on the outer wall of the drive shaft. A transmission assembly is provided between the rotating shaft and the drive shaft. A magnetic block A rotates at the bottom end of the cover. A connecting pipe is connected to the outer wall of the magnetic block A. A diverter pipe is connected to one end of the connecting pipe. A gas supply pipe B is connected between the magnetic block A and the shell.

[0007] Preferably, a motor is installed at the bottom end of the rotating shaft, the stirring rod and the stirring plate are hollow, and a through hole is opened on one side of the stirring plate.

[0008] Preferably, the air extraction assembly includes a horizontal pipe connected to the outer wall of the air supply pipe A, a piston sliding inside the horizontal pipe, a push rod fixedly connected to one side of the piston, a gear A sleeved on the outer wall of the rotating shaft, an eccentric wheel rotating at the top of the air storage plate via a bearing, a grooved plate installed at the top of the eccentric wheel, and one side of the grooved plate fixedly connected to one end of the push rod.

[0009] Preferably, the adjusting mechanism includes a circular plate that slides inside the cylinder, a connecting rod is installed on the top of the circular plate, a magnet is installed at one end of the connecting rod, the magnet is magnetically connected to the circular plate, a symmetrical sliding plate is installed inside the ventilation groove, a rack is installed between the two sets of sliding plates, and a gear B that meshes with the rack is sleeved on one end of the stirring rod.

[0010] Preferably, a spring A is sleeved on the outer wall of the connecting rod, one end of the spring A is fixedly connected to the bottom end of the circular plate, and the other end of the spring A is fixedly connected to the bottom end of the magnet.

[0011] Preferably, the outer wall of the rotating shaft has multiple sets of through holes, and the air storage plate is connected to the through holes.

[0012] Preferably, a one-way valve is installed at the connection between the gas supply pipe A and the gas storage pan, a nitrogen tank is installed on one side of the tank body, and the gas storage pan is connected to the nitrogen tank.

[0013] Preferably, the transmission assembly includes a transmission wheel A, a transmission wheel B, and a belt. The transmission wheel A is sleeved on the outer wall of the rotating shaft, the transmission wheel B is sleeved on the outer wall of the transmission shaft, and the transmission wheel A and the transmission wheel B are connected by a belt.

[0014] Preferably, a nozzle is installed at the bottom of the diversion pipe, the nozzle is inclined, a return pipe is connected between the outer shell and the air storage plate, and a one-way valve is installed at the connection between the air storage plate and the return pipe.

[0015] Preferably, a magnetic block B is installed at the top of the rotating shaft, and the magnetic block A is magnetically connected to the magnetic block B. The magnetic block A is configured as a hollow structure.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes the rotation of a rotating shaft to drive gear A, which in turn drives an eccentric wheel. The eccentric wheel then causes a grooved plate to reciprocate, which in turn pushes a piston within a horizontal tube via a push rod. This reciprocating movement of the piston delivers nitrogen from the gas storage pan through gas pipe A into the cylinder, then through a venting groove into the stirring plate, and finally out through the through-holes on the surface of the stirring plate. This prevents the high-molecular polymers and additives such as curing agents and fillers in the molding compound from oxidizing and degrading upon contact with oxygen, thus preventing yellowing, embrittlement, or performance degradation. It ensures the bonding strength and electrical insulation of the molding compound during subsequent encapsulation. Simultaneously, the flowing nitrogen acts as a heat transfer medium, rapidly transferring heat generated by the heating element. Combined with the stirring plate, this ensures uniform temperature distribution throughout the molding compound, reducing localized overheating areas and improving preheating efficiency.

[0017] 2. This invention activates an electric heating element, which generates heat to heat the molding compound. Simultaneously, a portion of the heat generated by the heating element is transferred to the interior of the gas storage pan through a heat-conducting pipe, preheating the nitrogen gas. This ensures that the temperature of the ejected gas is close to the preheating temperature of the molding compound, preventing the molding compound from cracking or experiencing performance degradation due to uneven thermal stress caused by low-temperature gas. Furthermore, when the nitrogen temperature rises to a certain level, a motor drives a rotating shaft, which in turn drives a stirring rod and stirring blades to rotate, causing the molding compound to tumble within the preheating cylinder and ensuring a uniform temperature distribution.

[0018] 3. In this invention, when nitrogen gas is delivered into the cylinder through gas pipe A, the internal pressure of the cylinder increases, causing the nitrogen gas to push the circular plate to slide upward along the inner wall of the cylinder. This causes the circular plate to drive the connecting rod to push the magnet upward synchronously, which in turn causes the magnet to drive the sliding plate upward. The sliding plate then drives the rack to move, which in turn drives the gear B to rotate. In turn, gear B drives the stirring rod and the stirring blade to rotate around their own axis. This achieves synchronous revolution and rotation of the stirring blade, causing the material to be disturbed in both the radial and circumferential directions, breaking the flow boundary layer, eliminating physical dead zones, and ensuring that the edge and center areas are heated synchronously, further improving the preheating efficiency of the molding compound.

[0019] 4. This invention utilizes the rotation of a rotating shaft, which, through the action of transmission wheels A and B, drives the transmission shaft to rotate. This rotation of the transmission shaft, in turn, drives the fan blades to rotate. The fan blades generate negative pressure, drawing nitrogen gas from the tank into the outer shell. The nitrogen gas is then transported to magnetic block A via gas supply pipe B. It then enters the distribution pipe through a connecting pipe and is uniformly sprayed onto the top of the preheating cylinder by an inclined nozzle. Simultaneously, when the cover is closed, magnetic block A rotates synchronously with the rotating shaft, causing the nozzle to rotate. This creates a spiral airflow of nitrogen gas that blows downwards. The rotational motion of this spiral airflow creates turbulence within the preheating cylinder, increasing the contact area and frequency between the gas and the molding compound, thereby improving heat transfer efficiency. Furthermore, the combination of the spiral airflow and the fixed airflow ejected from the stirring plate further enhances the heat transfer efficiency of the molding compound, reduces preheating time, and increases production efficiency. Simultaneously, nitrogen recycling reduces production costs, resulting in energy-saving and environmentally friendly effects. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the tank body of the present invention; Figure 3 This is a schematic diagram of the stirring mechanism of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram of section A; Figure 5 For the present invention Figure 3 Enlarged structural diagram of section B; Figure 6 This is a schematic diagram of the circulation mechanism structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram of section C.

[0021] Legend: 1. Tank body; 2. Nitrogen tank; 3. Heating element; 4. Preheating cylinder; 5. Stirring mechanism; 501. Motor; 502. Rotating shaft; 503. Ventilation slot; 504. Stirring rod; 505. Stirring blade; 6. Gas filling mechanism; 601. Gas storage pan; 602. Gas supply pipe A; 603. Cylinder body; 604. Horizontal pipe; 605. Piston; 606. Push rod; 607. Gear A; 608. Eccentric wheel; 609. Slot plate; 610. Heat conduction pipe; 7. Adjustment mechanism; 701. 702. Circular plate; 703. Connecting rod; 704. Magnet; 705. Spring A; 706. Slide plate; 707. Rack; 708. Gear B; 809. Circulation mechanism; 800. Housing; 801. Drive shaft; 802. Fan blade; 803. Drive wheel A; 804. Drive wheel B; 805. Drive wheel B; 806. Belt; 807. Magnetic block A; 808. Connecting pipe; 809. Diverter pipe; 810. Nozzle; 811. Magnetic block B; 812. Air supply pipe B; 813. Return pipe; 9. Cover. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] See Figures 1 to 7 As shown, the present invention provides a preheating device for molding compound, including a tank 1, an electric heating tube 3 installed inside the tank 1, a preheating cylinder 4 installed inside the tank 1, and a cover 9 hinged to the top of the tank 1. The preheating cylinder 4 is equipped with a stirring mechanism 5. The stirring mechanism 5 includes a rotating shaft 502 that rotates inside the preheating cylinder 4. A ventilation groove 503 is opened inside the rotating shaft 502. A stirring rod 504 rotates inside the ventilation groove 503. A stirring blade 505 is installed on the outer wall of the stirring rod 504. It should be noted that when preheating the molding compound is required, first open the cover 9 on the surface of the can 1, then put the molding compound into the preheating cylinder 4. At the same time, fill the gas storage pan 601 with a portion of the nitrogen from the nitrogen can 2. Then start the electric heating tube 3 to generate heat to heat the molding compound. Meanwhile, a portion of the heat generated by the electric heating tube 3 is transferred to the gas storage pan 601 through the heat conduction tube 610, so that the heat conduction tube 610 preheats the nitrogen and makes the temperature of the sprayed gas close to the preheating temperature of the molding compound. This prevents the molding compound from cracking or degrading due to uneven thermal stress caused by low-temperature gas. Meanwhile, when the nitrogen temperature rises to a certain level, the motor 501 is started. The motor 501 drives the rotating shaft 502 to rotate, which in turn drives the stirring rod 504 and the stirring plate 505 to rotate, thereby causing the molding compound to tumble in the preheating cylinder 4, ensuring a uniform temperature distribution.

[0024] An inflation mechanism 6 is provided at the bottom of the tank body 1. The inflation mechanism 6 includes an air storage plate 601 installed at the bottom of the tank body 1, a cylinder 603 installed at the bottom of the preheating cylinder 4, an air supply pipe A602 connecting the air storage plate 601 and the cylinder 603, an air extraction component on one side of the air supply pipe A602, the interior of the air storage plate 601 is connected to the interior of the ventilation groove 503, and multiple sets of heat conduction pipes 610 are installed at the top of the air storage plate 601. The interior of the cylinder 603 is equipped with an adjustment mechanism 7 for the tilting stirring rod 504; It should be noted that while the rotating shaft 502 rotates, it drives the gear A607 to rotate. Since the gear A607 is meshed with the eccentric wheel 608, the gear A607 drives the eccentric wheel 608 to rotate. As a result, the eccentric wheel 608 drives the groove plate 609 to move back and forth. The groove plate 609 pushes the piston 605 to move back and forth inside the horizontal tube 604 via the push rod 606. Thus, the reciprocating movement of the piston 605 transports the nitrogen from the gas storage plate 601 to the inside of the cylinder 603 through the gas delivery pipe A602, and then through the venting groove. 503 is delivered into the interior of the mixing plate 505 and finally sprayed out from the through holes on the surface of the mixing plate 505. This prevents the polymers and additives such as curing agents and fillers in the molding compound from oxidizing and degrading when they come into contact with oxygen, thus preventing the material from yellowing, becoming brittle, or experiencing performance degradation. This ensures the bonding strength and electrical insulation of the molding compound during subsequent encapsulation. At the same time, the flowing nitrogen gas, as a heat conduction medium, can quickly transfer the heat generated by the heating tube 3. In conjunction with the mixing plate 505, it ensures that the temperature of the molding compound is evenly distributed throughout the material, reducing local overheating areas and improving preheating efficiency. In addition, when nitrogen is delivered into the interior of cylinder 603 through gas pipe A602, the internal pressure of cylinder 603 increases, causing the nitrogen to push the circular plate 701 to slide upward along the inner wall of cylinder 603. As a result, the circular plate 701 drives the connecting rod 702 to push the magnet 703 to move upward synchronously. Since the magnet 703 is magnetically connected to the sliding plate 705, the magnet 703 drives the sliding plate 705 to move upward. Furthermore, the sliding plate 705 drives the rack 706 to move. Since the rack 706 is meshed with the gear B707, the rack 706 drives the gear B707 to rotate. In turn, the gear B707 drives the stirring rod 504 and the stirring blade 505 to rotate around their own axis, thereby realizing the synchronous revolution and rotation of the stirring blade 505. This causes the material to be disturbed in both the radial and circumferential directions, breaking the flow boundary layer, eliminating physical dead zones, and ensuring that the edge and center areas are heated synchronously, further improving the preheating efficiency of the molding compound.

[0025] The side wall of the tank body 1 is provided with a circulation mechanism 8. The circulation mechanism 8 includes a shell 801 installed on the side wall of the tank body 1. A drive shaft 802 rotates inside the shell 801. A fan blade 803 is installed on the outer wall of the drive shaft 802. A transmission assembly is provided between the rotating shaft 502 and the drive shaft 802. A magnetic block A807 rotates at the bottom end of the cover 9. A connecting pipe 808 is connected to the outer wall of the magnetic block A807. One end of the connecting pipe 808 is connected to a diversion pipe 809. A gas supply pipe B812 is connected between the magnetic block A807 and the shell 801.

[0026] It should be noted that when the rotating shaft 502 rotates, it drives the transmission shaft 802 to rotate through the action of the transmission wheels A804 and B805. This, in turn, drives the fan blade 803 to rotate. The rotation of the fan blade 803 generates negative pressure, drawing nitrogen from the tank 1 into the outer shell 801. A portion of the nitrogen enters the gas storage pan 601 through the return pipe 813 for recycling, while the remaining nitrogen is transported to the magnetic block A807 via the gas delivery pipe B812. The nitrogen then enters the distribution pipe 809 through the connecting pipe 808 and is then evenly sprayed onto the top of the preheating cylinder 4 by the inclined nozzle 810. Simultaneously, when the cover 9 is closed, the magnetic block B811... The magnetic block A807 is magnetically attracted to the rotating shaft 502, causing it to rotate synchronously. This, in turn, drives the nozzle 810 to rotate, resulting in a spiral airflow of nitrogen gas ejected from the nozzle 810 blowing downwards. The rotational motion of this spiral airflow creates turbulence within the preheating cylinder 4, increasing the contact area and frequency between the gas and the molding compound, thereby improving heat transfer efficiency. Furthermore, the combination of the spiral airflow and the fixed airflow ejected from the stirring plate 505 further enhances the heat transfer efficiency of the molding compound, reduces preheating time, and increases production efficiency. Simultaneously, nitrogen recycling reduces production costs, resulting in energy-saving and environmentally friendly benefits.

[0027] As described above, by activating the heating element 3 to heat the molding compound, the heat from the heating element 3 preheats the nitrogen gas via the heat conduction pipe 610, preventing damage to the molding compound due to uneven thermal stress. After the nitrogen gas is heated, the motor 501 drives the rotating shaft 502 to rotate, causing the stirring rod 504 and stirring blade 505 to tumble the molding compound, ensuring a uniform temperature field. The rotating shaft 502 also drives the piston 605 to reciprocate through the eccentric wheel 608, spraying the preheated nitrogen gas through the stirring blade 505 to prevent oxidation and degradation of the molding compound, and the nitrogen gas assists in heat conduction. In addition, the nitrogen gas delivery causes pressure changes inside the cylinder 603, driving the relevant components to make the stirring blade 505 revolve and rotate, improving preheating efficiency. At the same time, the rotating shaft 502 drives the fan blade 803 to rotate, drawing in the nitrogen gas from the tank. Part of the nitrogen gas is recycled, and the other part is blown downwards through the nozzle 810 in the form of a spiral airflow, which combines with the airflow sprayed out by the stirring blade 505 to further improve heat conduction efficiency, shorten preheating time, reduce costs, and achieve energy-saving and environmental protection effects.

[0028] See Figures 3 to 5 As shown, a motor 501 is installed at the bottom of the rotating shaft 502, and the stirring rod 504 and stirring plate 505 are hollow, with a through hole on one side of the stirring plate 505.

[0029] See Figures 3 to 4 As shown, the air extraction assembly includes a horizontal pipe 604 connected to the outer wall of the air supply pipe A602. A piston 605 slides inside the horizontal pipe 604. A push rod 606 is fixedly connected to one side of the piston 605. A gear A607 is sleeved on the outer wall of the rotating shaft 502. An eccentric wheel 608 rotates at the top of the air storage plate 601 through a bearing. A groove plate 609 is installed at the top of the eccentric wheel 608. One side of the groove plate 609 is fixedly connected to one end of the push rod 606.

[0030] See Figures 3 to 5 As shown, the adjusting mechanism 7 includes a circular plate 701 that slides inside the cylinder 603. A connecting rod 702 is installed on the top of the circular plate 701. A magnet 703 is installed at one end of the connecting rod 702. The magnet 703 is magnetically connected to the circular plate 701. A symmetrical sliding plate 705 is installed inside the ventilation groove 503. A rack 706 is installed between the two sets of sliding plates 705. A gear B707 that meshes with the rack 706 is sleeved on one end of the stirring rod 504.

[0031] See Figure 4 As shown, a spring A704 is sleeved on the outer wall of the connecting rod 702. One end of the spring A704 is fixedly connected to the bottom end of the circular plate 701, and the other end of the spring A704 is fixedly connected to the bottom end of the magnet 703. When the nitrogen pressure decreases, the elastic restoring force of the spring A704 can restore the circular plate 701, the connecting rod 702 and the magnet 703 to their initial positions.

[0032] See Figure 4 As shown, the outer wall of the rotating shaft 502 has multiple sets of through holes, and the gas storage plate 601 is connected to the through holes, so that nitrogen can be evenly sprayed into the molding compound through these through holes.

[0033] See Figure 4 As shown, a one-way valve is installed at the connection between the gas supply pipe A602 and the gas storage pan 601. A nitrogen tank 2 is installed on one side of the tank body 1. The gas storage pan 601 is connected to the nitrogen tank 2. The one-way valve ensures that the gas can only flow from the gas storage pan 601 to the cylinder 603 and cannot flow in the opposite direction.

[0034] See Figure 6 As shown, the transmission assembly includes a transmission wheel A804, a transmission wheel B805, and a belt 806. The transmission wheel A804 is sleeved on the outer wall of the rotating shaft 502, and the transmission wheel B805 is sleeved on the outer wall of the transmission shaft 802. The transmission wheel A804 and the transmission wheel B805 are connected by the belt 806.

[0035] See Figure 6 As shown, a nozzle 810 is installed at the bottom of the distributor pipe 809. The nozzle 810 is set at an angle. The nitrogen gas sprayed by the angled nozzle 810 can form turbulence in the preheating cylinder 4, which further enhances the heat transfer between the gas and the molding compound, making the temperature of each part of the molding compound more uniform.

[0036] See Figures 6 to 7 As shown, a magnetic block B811 is installed at the top of the rotating shaft 502. Magnetic block A807 is magnetically connected to magnetic block B811. Magnetic block A807 is set as a hollow structure. A return pipe 813 is connected between the outer shell 801 and the gas storage plate 601. A one-way valve is installed at the connection between the gas storage plate 601 and the return pipe 813. The hollow structure can serve as a gas channel, allowing nitrogen to enter the diversion pipe 809 and the nozzle 810 through the hollow channel inside the magnetic block A807.

[0037] Working principle: When preheating the molding compound is required, first open the cover 9 on the surface of the can 1, then put the molding compound into the preheating cylinder 4. At the same time, fill the gas storage plate 601 with a portion of the nitrogen from the nitrogen can 2. Then start the electric heating tube 3 to generate heat to heat the molding compound. At the same time, part of the heat generated by the electric heating tube 3 is transferred to the gas storage plate 601 through the heat conduction tube 610, so that the heat conduction tube 610 preheats the nitrogen and makes the temperature of the sprayed gas close to the preheating temperature of the molding compound. This prevents the molding compound from cracking or degrading due to uneven thermal stress caused by low temperature gas. Meanwhile, when the nitrogen temperature rises to a certain level, the motor 501 is started. The motor 501 drives the rotating shaft 502 to rotate, which in turn drives the stirring rod 504 and the stirring plate 505 to rotate, thereby causing the molding compound to tumble in the preheating cylinder 4 to ensure a uniform temperature distribution. Furthermore, as the rotating shaft 502 rotates, it drives the gear A607 to rotate. Since the gear A607 is meshed with the eccentric wheel 608, the gear A607 drives the eccentric wheel 608 to rotate. As a result, the eccentric wheel 608 drives the groove plate 609 to reciprocate. The groove plate 609 pushes the piston 605 to reciprocate inside the horizontal tube 604 via the push rod 606. Thus, the reciprocating movement of the piston 605 transports the nitrogen from the gas storage plate 601 to the inside of the cylinder 603 through the gas delivery pipe A602, and then through the venting groove 50. 3. The material is conveyed into the interior of the mixing plate 505 and finally sprayed out from the through holes on the surface of the mixing plate 505. This avoids the oxidative degradation of the polymers and additives such as curing agents and fillers in the molding compound when they come into contact with oxygen, preventing the material from yellowing, becoming brittle, or experiencing performance degradation. This ensures the bonding strength and electrical insulation of the molding compound during subsequent encapsulation. At the same time, the flowing nitrogen gas, as a heat conduction medium, can quickly transfer the heat generated by the heating tube 3. In conjunction with the mixing plate 505, it ensures that the temperature of each part of the molding compound is evenly distributed, reducing local overheating areas and improving preheating efficiency. In addition, when nitrogen is delivered into the interior of cylinder 603 through gas pipe A602, the internal pressure of cylinder 603 increases, causing the nitrogen to push the circular plate 701 to slide upward along the inner wall of cylinder 603. As a result, the circular plate 701 drives the connecting rod 702 to push the magnet 703 to move upward synchronously. Since the magnet 703 is magnetically connected to the sliding plate 705, the magnet 703 drives the sliding plate 705 to move upward. Furthermore, the sliding plate 705 drives the rack 706 to move. Since the rack 706 is meshed with the gear B707, the rack 706 drives the gear B707 to rotate. In turn, the gear B707 drives the stirring rod 504 and the stirring blade 505 to rotate around their own axis, thereby realizing the synchronous revolution and rotation of the stirring blade 505. This causes the material to be disturbed in both the radial and circumferential directions, breaking the flow boundary layer, eliminating physical dead zones, and ensuring that the edge and center areas are heated synchronously, further improving the preheating efficiency of the molding compound. Furthermore, as the rotating shaft 502 rotates, it drives the transmission shaft 802 to rotate via the action of the transmission wheels A804 and B805. This, in turn, drives the fan blade 803 to rotate. The rotation of the fan blade 803 generates negative pressure, drawing nitrogen gas from the tank 1 into the outer shell 801. A portion of the nitrogen gas enters the gas storage pan 601 through the return pipe 813 for recycling, while the remaining nitrogen gas is transported to the magnetic block A807 via the gas delivery pipe B812. The nitrogen gas then enters the distribution pipe 809 through the connecting pipe 808 and is then evenly sprayed onto the top of the preheating cylinder 4 by the inclined nozzle 810. Simultaneously, when the cover 9 is closed, the magnetic block B811 interacts with the magnetic... Block A807 is magnetically attracted, causing it to rotate synchronously with the rotating shaft 502. This, in turn, drives the nozzle 810 to rotate, creating a spiral airflow from the nozzle 810 that blows downwards. The rotational motion of this spiral airflow creates turbulence within the preheating cylinder 4, increasing the contact area and frequency between the gas and the molding compound, thereby improving heat transfer efficiency. Furthermore, the combination of the spiral airflow and the fixed airflow ejected from the stirring plate 505 further enhances the heat transfer efficiency of the molding compound, reduces preheating time, and increases production efficiency. Simultaneously, nitrogen recycling reduces production costs, resulting in energy conservation and environmental protection.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A preheating device for molding compound, comprising a tank (1), characterized in that: The tank (1) is equipped with an electric heating tube (3) and a preheating cylinder (4). The top of the tank (1) is hinged with a cover (9). The preheating cylinder (4) is equipped with a stirring mechanism (5). The stirring mechanism (5) includes a rotating shaft (502) that rotates inside the preheating cylinder (4). A ventilation groove (503) is opened inside the rotating shaft (502). A stirring rod (504) rotates inside the ventilation groove (503). A stirring blade (505) is installed on the outer wall of the stirring rod (504). The tank (1) is provided with an inflation mechanism (6) at the bottom of its interior. The inflation mechanism (6) includes an air storage plate (601) installed at the bottom of the tank (1). The preheating cylinder (4) is provided with a cylinder (603) at its bottom. An air supply pipe A (602) is connected between the air storage plate (601) and the cylinder (603). An air extraction component is provided on one side of the air supply pipe A (602). The interior of the air storage plate (601) is connected to the interior of the ventilation groove (503). Multiple sets of heat conduction pipes (610) are installed at the top of the air storage plate (601). The cylinder (603) is equipped with an adjustment mechanism (7) for the tilting stirring rod (504). The tank (1) has a circulation mechanism (8) on its side wall. The circulation mechanism (8) includes a shell (801) installed on the side wall of the tank (1). A drive shaft (802) rotates inside the shell (801). A fan blade (803) is installed on the outer wall of the drive shaft (802). A transmission assembly is provided between the rotating shaft (502) and the drive shaft (802). A magnetic block A (807) rotates at the bottom of the cover (9). A connecting pipe (808) is connected to the outer wall of the magnetic block A (807). A diversion pipe (809) is connected to one end of the connecting pipe (808). A gas supply pipe B (812) is connected between the magnetic block A (807) and the shell (801).

2. The molding compound preheating device according to claim 1, characterized in that: The bottom end of the rotating shaft (502) is equipped with a motor (501), the stirring rod (504) and the stirring plate (505) are hollow, and a through hole is opened on one side of the stirring plate (505).

3. The molding compound preheating device according to claim 1, characterized in that: The air extraction assembly includes a horizontal pipe (604) connected to the outer wall of the air supply pipe A (602). A piston (605) slides inside the horizontal pipe (604). A push rod (606) is fixedly connected to one side of the piston (605). A gear A (607) is sleeved on the outer wall of the rotating shaft (502). An eccentric wheel (608) rotates at the top of the air storage plate (601) through a bearing. A groove plate (609) is installed at the top of the eccentric wheel (608). One side of the groove plate (609) is fixedly connected to one end of the push rod (606).

4. The molding compound preheating device according to claim 1, characterized in that: The adjusting mechanism (7) includes a circular plate (701) that slides inside the cylinder (603). A connecting rod (702) is installed on the top of the circular plate (701). A magnet (703) is installed at one end of the connecting rod (702). The magnet (703) is magnetically connected to the circular plate (701). A symmetrical sliding plate (705) is installed inside the ventilation groove (503). A rack (706) is installed between the two sets of sliding plates (705). A gear B (707) meshing with the rack (706) is sleeved on one end of the stirring rod (504).

5. The molding compound preheating device according to claim 4, characterized in that: The outer wall of the connecting rod (702) is fitted with a spring A (704), one end of the spring A (704) is fixedly connected to the bottom end of the circular plate (701), and the other end of the spring A (704) is fixedly connected to the bottom end of the magnet (703).

6. The molding compound preheating device according to claim 1, characterized in that: The outer wall of the rotating shaft (502) has multiple sets of through holes, and the gas storage plate (601) is connected to the through holes.

7. The molding compound preheating device according to claim 1, characterized in that: A one-way valve is installed at the connection between the gas supply pipe A (602) and the gas storage pan (601). A nitrogen tank (2) is installed on one side of the tank body (1). The gas storage pan (601) is connected to the nitrogen tank (2).

8. The molding compound preheating device according to claim 1, characterized in that: The transmission assembly includes a transmission wheel A (804), a transmission wheel B (805), and a belt (806). The transmission wheel A (804) is sleeved on the outer wall of the rotating shaft (502), and the transmission wheel B (805) is sleeved on the outer wall of the transmission shaft (802). The transmission wheel A (804) and the transmission wheel B (805) are connected by the belt (806).

9. The molding compound preheating device according to claim 1, characterized in that: A nozzle (810) is installed at the bottom of the diversion pipe (809). The nozzle (810) is set at an angle. A return pipe (813) is connected between the outer shell (801) and the air storage plate (601). A one-way valve is installed at the connection between the air storage plate (601) and the return pipe (813).

10. A molding compound preheating device according to claim 1, characterized in that: A magnetic block B (811) is installed at the top of the rotating shaft (502), and the magnetic block A (807) is magnetically connected to the magnetic block B (811). The magnetic block A (807) is set as a hollow structure.

Images