A plastic secondary foaming molding machine

Abstract

This invention discloses a plastic secondary foaming molding machine, belonging to the technical field of plastic processing equipment. It includes a worktable, a bottom mold fixedly installed on the top wall of the worktable, a mold cavity formed on the bottom mold, a feed pipe inserted into the side wall of the mold cavity, a top mold on the top wall of the worktable, and a fixing component that cooperates with the top mold on the bottom mold. The fixing component includes a first groove and a second groove respectively formed on the bottom mold. This design uses a buoyancy plate. After the plastic raw material enters the mold cavity, the buoyancy plate moves upward, and the first fixing rod disengages from the fixing groove through a control component. Then, after the top mold reaches the position for the second foaming molding, the second fixing rod automatically inserts into the fixing groove and fixes the top mold. This eliminates the need for frequent adjustments to the volume within the mold cavity by the user, thus improving the foaming molding efficiency.

Description

Technical Field

[0001] This invention relates to the field of plastic processing equipment technology, and more specifically, to a plastic secondary foaming molding machine. Background Art

[0002] Plastic foaming molding involves mixing, open mixing, and first molding of rubber and plastic raw materials such as PE and EVA, followed by secondary foaming molding in a steam molding machine to become the final product.

[0003] Most existing plastic secondary foaming molding methods are two-step foaming methods, also known as intermittent methods. In this method, after the plastic raw materials are mixed, they are first pre-foamed or pre-foamed. At this time, the foam or beads have not fully expanded and have a high density. The resulting beads are expandable beads. Then, post-foaming or secondary foaming is carried out. In this process, fully expanded, low-density final foam products are produced, such as polystyrene and polyethylene foam. However, in the actual foaming process, it is generally composed of two sets of molds and injection molding machines. After the injection process is completed, secondary foaming is carried out by directly increasing the foaming space. This foaming method is prone to forming wrinkles and depressions on the surface of the foamed material, making it difficult to guarantee the quality of foam molding. It may even require remelting and foaming, which seriously affects the foam molding efficiency.

[0004] To address the aforementioned issues, some solutions have been proposed in the prior art. For example, patent application CN112318806A discloses a plastic secondary foaming molding machine. During the secondary foaming process, the movable template can be slowly pushed upward by the foaming material, thereby meeting the space requirements of the foamed plastic. The foaming material remains in close contact with the inner wall of the mold cavity, resulting in good shaping effect and effectively avoiding the occurrence of foam voids and wrinkles on the surface of the foamed plastic, thus avoiding rework and effectively improving foaming molding efficiency. However, in actual use, it is necessary for personnel to manually fix the movable template during the primary foaming stage. After the primary foaming stage, the movable template needs to be released first, and then fixed again during the secondary foaming stage. After the secondary foaming stage, it is necessary for personnel to release the movable template again, repeating the process of fixing the movable template repeatedly, which seriously affects the foaming efficiency. Furthermore, it is impossible for personnel to accurately control the time of the primary foaming stage. If the personnel release the fixation of the template after the primary foaming stage too early or too late, it will affect the foaming molding quality, so there is still a risk of rework, which in turn seriously affects the foaming molding efficiency. Summary of the Invention

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide a plastic secondary foaming molding machine that can improve the foaming molding efficiency.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A plastic secondary foaming molding machine includes a worktable, a bottom mold fixedly installed on the top wall of the worktable, a mold cavity opened on the bottom mold, a feed pipe inserted into the side wall of the mold cavity, a top mold provided on the top wall of the worktable, and a fixing component that cooperates with the top mold on the bottom mold.

[0008] The fixing component includes a first groove and a second groove respectively formed on the bottom mold. A first fixing rod is slidably installed in the first groove, and one end of the first fixing rod, which is made of a first spring, is inclined. The top mold has a fixing groove that cooperates with the first fixing rod. A first spring is fixedly installed between the first fixing rod and the first groove. A second fixing rod is slidably installed in the second groove. A second spring is installed between the second fixing rod and the second groove. The top mold is provided with a driving component that cooperates with the first fixing rod and the second fixing rod.

[0009] Furthermore, the driving component includes a vertical groove formed on the top mold, a buoyancy plate slidably installed in the vertical groove, an elastic airbag jointly installed between the top wall of the buoyancy plate and the vertical groove, a first air pipe inserted into the first sliding groove, and a control component provided on the top mold, the first air pipe communicating with the elastic airbag through the control component, a second air pipe connected to the first air pipe inserted into the second sliding groove, a mounting frame fixedly installed on the top wall of the worktable, an electric telescopic rod fixedly installed on the mounting frame, a connecting plate fixedly installed on the output end of the electric telescopic rod, and first elastic telescopic rods whose output ends are fixedly connected to the top mold evenly fixedly installed on the bottom wall of the connecting plate.

[0010] Furthermore, the control component includes a sealing rod that is vertically and slidably installed on the top mold, and a return spring is installed between the top wall of the sealing rod and the top mold. A third air tube is inserted into the elastic airbag, and a communication hole is opened on the sealing rod to communicate with the third air tube. The first air tube is connected to the third air tube through the communication hole.

[0011] Furthermore, a pressure relief hole is provided on the bottom wall of the top mold, and a fourth air pipe is inserted into the side wall of the pressure relief hole. A horizontal groove communicating with the fourth air pipe is provided on the bottom mold. An installation plate is slidably and sealed in the horizontal groove, and a third spring is installed between the installation plate and the horizontal groove. Elastic rods extending into the horizontal groove are uniformly fixedly installed on the bottom wall of the mold cavity. Impact rods for impacting the elastic rods are uniformly fixedly installed on the top wall of the installation plate. An anti-blocking component that cooperates with the pressure relief hole is provided on the top mold.

[0012] Furthermore, the anti-blocking component includes an installation groove on the top mold, a gear is rotatably installed in the installation groove, a second elastic telescopic rod is vertically slidably installed in the installation groove, a first rack that meshes with the gear is fixedly installed on the second elastic telescopic rod, a second rack that meshes with the gear is fixedly installed on the buoyancy plate, and a linkage component that cooperates with the output end of the second elastic telescopic rod is provided on the top mold.

[0013] Furthermore, the linkage assembly includes a linkage groove formed on the top mold, a horizontal plate for sealing the pressure relief hole is slidably installed in the linkage groove, a fourth spring is installed between the horizontal plate and the linkage groove, a first magnet is embedded in the horizontal plate, a second magnet is embedded in the buoyancy plate, and the first magnet and the second magnet attract each other.

[0014] Furthermore, the bottom mold has an installation cavity, the top wall of the installation cavity has an insertion hole extending into the mold cavity, a connecting plate is slidably installed in the vertical groove of the installation cavity, and a fifth spring is installed between the connecting plate and the installation cavity. A sealing rod with sliding fit due to the insertion hole is inserted into the top wall of the connecting plate, an exhaust pipe extending into the installation cavity is inserted into the side wall of the horizontal groove, and a temperature control component for controlling the movement of the connecting plate is provided on the bottom mold.

[0015] Furthermore, the temperature control component includes a push plate that is slidably installed in the mounting cavity, and the side wall of the push plate near the connecting plate is inclined. A push rod is fixedly installed on the connecting plate, and an elastic pad and a shape memory alloy wire are installed together between the push rod and the bottom mold. A heat-conducting rod that contacts the shape memory alloy wire is fixedly installed on the mold cavity.

[0016] Furthermore, the bottom mold has an exhaust hole communicating with the first air pipe, and the bottom mold has a groove communicating with the exhaust hole. A sealing plate for sealing the exhaust hole is slidably installed in the groove. The elastic pad has a cavity, and a fifth air pipe communicating with the groove is inserted into the cavity.

[0017] Furthermore, an air inlet valve with its input end connected to the first air tube is inserted into the top wall of the elastic airbag.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] (1) By setting up a buoyancy plate, after the plastic raw material enters the mold cavity, the buoyancy plate will move upward and the first fixing rod will be disengaged from the fixing groove by the control component. Then, after the top mold reaches the position of the second foaming molding, the second fixing rod can be automatically inserted into the fixing groove and the top mold can be fixed. Therefore, the user does not need to spend time frequently adjusting the volume in the mold cavity, which improves the foaming molding efficiency.

[0020] (2) By setting pressure relief holes, this solution can remove residual air in the mold cavity after the raw material enters the mold cavity, avoid leaving gaps in the mold cavity, which would affect the quality of foaming and molding and require time for rework. At the same time, after the airflow flows to the pressure relief holes, the airflow will flow to the horizontal groove through the fourth air pipe and drive the impact rod to hit the elastic rod through the mounting plate. Then the elastic rod vibrates under its own elastic force, and the elastic rod can transmit the vibration to the mold cavity, so that the raw material can fill the entire mold cavity, avoid leaving gaps in the mold cavity, which would affect the quality of foaming and molding and require time for rework, and further improve the efficiency of foaming and molding.

[0021] (3) By setting a memory alloy wire, after the plastic raw material returns to normal temperature, the pusher can drive the push plate to disengage from the connecting plate. At this time, the connecting plate drives the sealing rod to disengage from the insertion hole, so that the airflow in the horizontal groove can flow through the insertion hole on the mounting cavity to the gap between the molded plastic and the bottom wall of the mold cavity. This can avoid the negative pressure between the molded plastic and the mold cavity, which would require the user to spend a long time to take out the molded plastic, and further improve the foaming molding efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the bottom mold and top mold of the present invention;

[0024] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 For the present invention Figure 2 Enlarged view at point B in the middle;

[0026] Figure 5 For the present invention Figure 2 Enlarged view at point C;

[0027] Figure 6 For the present invention Figure 2 Enlarged view at point D;

[0028] Figure 7 This is a diagram showing the combination of the push plate, push rod, shape memory alloy wire, and elastic pad of the present invention.

[0029] Figure 8 This is a schematic diagram of the mounting plate and impact rod of the present invention.

[0030] Explanation of the labels in the diagram:

[0031] 1. Workbench; 2. Bottom mold; 3. Mold cavity; 4. Feed pipe; 5. Mounting bracket; 6. Electric telescopic rod; 7. Connecting plate; 8. First elastic telescopic rod; 9. Top mold;

[0032] 10. Fixing component; 101. First slide rail; 102. Second slide rail; 103. First fixing rod; 104. Fixing groove; 105. First spring; 106. Second fixing rod; 107. Second spring;

[0033] 11. Drive assembly; 1102. Buoyancy plate; 1103. Elastic airbag; 1104. First air tube; 1105. Second air tube;

[0034] 12. Control component; 1203. Sealing rod; 1204. Return spring; 1205. Third air pipe; 1206. Connecting hole;

[0035] 1301, Pressure relief hole; 1302, Fourth air pipe; 1303, Horizontal groove; 1304, Mounting plate; 1305, Third spring; 1306, Elastic rod; 1307, Impact rod;

[0036] 14. Anti-blocking component; 1401. Gear; 1402. Second elastic telescopic rod; 1403. First rack; 1404. Second rack;

[0037] 15. Linkage assembly; 1501. First magnet; 1502. Horizontal plate; 1503. Fourth spring; 1504. Second magnet;

[0038] 1601. Insertion hole; 1602. Connecting plate; 1603. Fifth spring; 1604. Sealing rod; 1605. Exhaust pipe;

[0039] 17. Temperature control assembly; 1701. Push plate; 1702. Push rod; 1703. Shape memory alloy wire; 1704. Heat conduction rod; 1705. Elastic pad;

[0040] 1801, Exhaust port; 1802, Groove; 1803, Sealing plate; 1804, Cavity; 1805, Fifth air pipe; 1806, Intake valve. Detailed Implementation

[0041] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] Please see Figures 1 to 8A plastic secondary foaming molding machine includes a workbench 1, a bottom mold 2 fixedly installed on the top wall of the workbench 1, a mold cavity 3 opened on the bottom mold 2, a feed pipe 4 inserted on the side wall of the mold cavity 3, a top mold 9 provided on the top wall of the workbench 1, and a fixing component 10 that cooperates with the top mold 9 on the bottom mold 2.

[0043] The fixing component 10 includes a first sliding groove 101 and a second sliding groove 102 respectively formed on the bottom mold 2. A first fixing rod 103 is slidably installed in the first sliding groove 101, and one end of the first fixing rod 103 is inclined. The top mold 9 has a fixing groove 104 that cooperates with the first fixing rod 103. The first fixing rod 103 and the first sliding groove 101 are fixedly installed together with the first spring 105. A second fixing rod 106 is slidably installed in the second sliding groove 102. The second fixing rod 106 and the second sliding groove 102 are installed together with the second spring 107. The top mold 9 is provided with a driving component 11 that cooperates with the first fixing rod 103 and the second fixing rod 106.

[0044] The drive assembly 11 includes a vertical groove formed on the top mold 9. A buoyancy plate 1102 is slidably installed in the vertical groove. An elastic airbag 1103 is installed between the top wall of the buoyancy plate 1102 and the vertical groove. A first air pipe 1104 is inserted into the first slide groove 101. A control assembly 12 is provided on the top mold 9. The first air pipe 1104 is connected to the elastic airbag 1103 through the control assembly 12. A second air pipe 1105 connected to the first air pipe 1104 is inserted into the second slide groove 102. A mounting frame 5 is fixedly installed on the top wall of the worktable 1. An electric telescopic rod 6 is fixedly installed on the mounting frame 5. A connecting plate 7 is fixedly installed on the output end of the electric telescopic rod 6. A first elastic telescopic rod 8 whose output end is fixedly connected to the top mold 9 is evenly fixedly installed on the bottom wall of the connecting plate 7.

[0045] The control component 12 includes a sealing rod 1203 that is vertically and slidably installed on the top mold 9, and a return spring 1204 is installed between the top wall of the sealing rod 1203 and the top mold 9. A third air tube 1205 is inserted into the elastic airbag 1103. A connecting hole 1206 is opened on the sealing rod 1203 to communicate with the third air tube 1205, and the first air tube 1104 is connected to the third air tube 1205 through the connecting hole 1206.

[0046] In use, the output end of the electric telescopic rod 6 extends and drives the connecting plate 7 to move downward. During the downward movement of the connecting plate 7, the first elastic rod 1306 drives the top mold 9 to move downward. As the top mold 9 moves downward, it gradually contacts the inclined surface of the first fixed rod 103 and applies a pushing force to the inclined surface of the first fixed rod 103. Under the action of the pushing force, the first fixed rod 103 moves along the first slide groove 101 and compresses the first spring 105. After the top mold 9 reaches the first foaming position, the first fixed rod 103 contacts the fixed groove 104. At this time, the first spring 105 extends and drives the first... The fixing rod 103 is inserted into the fixing groove 104 to fix the top mold 9. Then, the plastic raw material after internal mixing flows into the mold cavity 3 through the feed pipe 4. As the raw material in the mold cavity 3 increases, it gradually comes into contact with the buoyancy plate 1102 and drives the buoyancy plate 1102 to move upward. During the upward movement of the buoyancy plate 1102, it will compress the elastic air bladder 1103. After the buoyancy plate 1102 is completely inserted into the vertical groove, the elastic air bladder 1103 reaches its maximum compression. Then, the user can stop supplying raw material into the mold cavity 3. At this time, the first foaming ends, and the elastic air bladder 1103 stops compressing. The airflow within the airbag 1103 flows through the control component 12 and the first air tube 1104 into the first slide groove 101, causing the first fixed rod 103 to move away from the fixed groove 104. At this time, the first spring 105 is compressed and has a tendency to recover. During the movement of the first fixed rod 103, it gradually disengages from the fixed groove 104. At this time, secondary foaming begins. As the raw material in the mold cavity 3 undergoes secondary foaming, the volume of the raw material in the raw material cavity gradually expands and causes the top mold 9 to move upward. At this time, the first elastic telescopic rod 8 is compressed and has a tendency to recover. Due to the second air tube 1105 and the first... Since the air pipe 1104 is connected, some airflow will flow into the second slide groove 102 through the second air pipe 1105, causing the second fixed rod 106 to tend to move towards the top mold 9. Then, as the top mold 9 moves upward, the top mold 9 drives the fixed groove 104 to gradually contact the second fixed rod 106. Then, the airflow drives the second fixed rod 106 to insert into the fixed groove 104 and stretch the second spring 107. This can limit the volume of plastic in the second foaming molding process, so that the user does not need to spend time frequently adjusting the volume in the mold cavity 3, which improves the foaming molding efficiency.

[0047] Initially, the return spring 1204 is in a freely extended state. Then, as the buoyancy block moves upward, it gradually contacts the sealing rod 1203 and drives the sealing rod 1203 to move upward. After the buoyancy block is fully inserted into the vertical groove, the sealing rod 1203 drives the connecting hole 1206 to connect with the first air pipe 1104. At this time, the airflow in the elastic airbag 1103 flows through the third air pipe 1205, the connecting hole 1206, and the first air pipe 1104 to the first slide groove 101 and the second slide groove 102. This can prevent the airflow from flowing into the first slide groove 101 in advance, which would prevent the first fixing rod 103 from fixing the top mold 9 in the first foaming process through the fixing groove 104, affecting the foaming molding quality and even causing rework, thus further improving the foaming molding efficiency.

[0048] like Figure 2 , Figure 5 As shown, the top mold 9 has a pressure relief hole 1301 on its bottom wall, and a fourth air pipe 1302 is inserted into the side wall of the pressure relief hole 1301. The bottom mold 2 has a horizontal groove 1303 that communicates with the fourth air pipe 1302. An installation plate 1304 is slidably and sealed in the horizontal groove 1303, and a third spring 1305 is installed between the installation plate 1304 and the horizontal groove 1303. Elastic rods 1306 extending into the horizontal groove 1303 are uniformly fixedly installed on the bottom wall of the mold cavity 3. Impact rods 1307 for impacting the elastic rods 1306 are uniformly fixedly installed on the top wall of the installation plate 1304. The top mold 9 has an anti-blocking component 14 that cooperates with the pressure relief hole 1301.

[0049] The anti-blocking component 14 includes a mounting groove on the top mold 9, in which a gear 1401 is rotatably mounted, and a second elastic telescopic rod 1402 is vertically slidably mounted. A first rack 1403 that meshes with the gear 1401 is fixedly mounted on the second elastic telescopic rod 1402. A second rack 1404 that meshes with the gear 1401 is fixedly mounted on the buoyancy plate 1102. The top mold 9 is provided with a linkage component 15 that cooperates with the output end of the second elastic telescopic rod 1402.

[0050] The linkage assembly 15 includes a linkage groove formed on the top mold 9. A horizontal plate 1502 for sealing the pressure relief hole 1301 is slidably installed in the linkage groove. A fourth spring 1503 is installed between the horizontal plate 1502 and the linkage groove. A first magnet 1501 is embedded in the horizontal plate 1502, and a second magnet 1504 is embedded in the buoyancy plate 1102. The first magnet 1501 and the second magnet 1504 attract each other.

[0051] By adopting the above technical solution, after the raw material flows into the mold cavity 3, the original airflow in the mold cavity 3 flows to the outside through the pressure relief hole 1301, thereby avoiding residual airflow in the mold cavity 3 and affecting the molding quality, thus reducing the risk of rework. At the same time, after the airflow flows to the outside, the airflow flows into the horizontal groove 1303 through the pressure relief hole 1301 and the fourth air pipe 1302, which increases the pressure in the horizontal groove 1303. Then, under the action of pressure, the mounting plate 1304 drives the impact rod 1307 to move and stretches and compresses the third spring 13. 05. During the movement of the impact rod 1307, it gradually comes into contact with the elastic rod 1306, causing the elastic rod 1306 to deform. Then, when the impact rod 1307 and the elastic rod 1306 separate, the elastic rod 1306 vibrates under its own elastic force. The elastic rod 1306 can then transmit the vibration to the mold cavity 3, thereby allowing the raw material to fill the entire mold cavity 3, avoiding gaps in the mold cavity 3 that would affect the foaming molding quality and require time for rework, thus further improving the foaming molding efficiency.

[0052] Initially, the fourth spring 1503 is in a freely extended state, and the horizontal plate 1502 is in contact with the pressure relief hole 1301. During the process of the plastic material driving the buoyancy plate 1102 completely into the vertical groove, some plastic material enters the pressure relief hole 1301. As the buoyancy plate 1102 moves upward, it drives the second rack 1404 upward. During the upward movement of the second rack 1404, the gear 1401 drives the first rack 1403 downward. Then, during the downward movement of the first rack 1403, it drives the second elastic telescopic rod 1402 downward. During the downward movement of the second elastic telescopic rod 1402, its output end gradually contacts the horizontal plate 1502. Due to the obstruction of the horizontal plate 1502, as the second elastic telescopic rod 1402 moves downward, its output end gradually contracts and returns to its original position. The trend is such that, as the buoyancy plate 1102 moves upward, it drives the second magnet 1504 to move upward and gradually approaches the first magnet 1501. After the buoyancy plate 1102 is fully inside the vertical groove, the distance between the second magnet 1504 and the first magnet 1501 reaches its closest point. At this time, the attraction between the first magnet 1501 and the second magnet 1504 reaches its maximum. Then, under the action of attraction, the first magnet 1501 drives the horizontal plate 1502 to approach the second magnet 1504. As the horizontal plate 1502 moves, it gradually disengages from the output end of the second elastic telescopic rod 1402. At this time, the output end of the second elastic telescopic rod 1402 extends and can push out the plastic material in the pressure relief hole 1301, thereby avoiding the residual plastic material in the pressure relief hole 1301 and foaming, which would require users to spend a long time cleaning the pressure relief hole 1301. This improves the foaming molding efficiency.

[0053] like Figure 2 , Figure 6 , Figure 7 As shown, the bottom mold 2 has an installation cavity, and the top wall of the installation cavity has an insertion hole 1601 extending into the mold cavity 3. A connecting plate 1602 is slidably installed in the vertical groove of the installation cavity, and a fifth spring 1603 is installed between the connecting plate 1602 and the installation cavity. A sealing rod 1604 is inserted into the top wall of the connecting plate 1602 due to the sliding fit of the insertion hole 1601. An exhaust pipe 1605 extending into the installation cavity is inserted into the side wall of the horizontal groove 1303. The bottom mold 2 is provided with a temperature control component 17 for controlling the movement of the connecting plate 1602.

[0054] The temperature control component 17 includes a push plate 1701 that is slidably installed in the mounting cavity, and the side wall of the push plate 1701 near the connecting plate 1602 is inclined. A push rod 1702 is fixedly installed on the connecting plate 1602. An elastic pad 1705 and a shape memory alloy wire 1703 are installed together between the push rod 1702 and the bottom mold 2. A heat-conducting rod 1704 that contacts the shape memory alloy wire 1703 is fixedly installed on the mold cavity 3.

[0055] By adopting the above technical solution, after the raw material enters the mold cavity 3, the raw material first contacts the guide rod, and then the heat-conducting rod 1704 transfers heat to the shape memory alloy wire 1703, causing the shape memory alloy wire 1703 to stretch due to heat. At this time, during the stretching process of the shape memory alloy wire 1703, the elastic pad 1705 stretches and drives the push rod 1702 to move. During the movement of the push rod 1702, it drives the push plate 1701 to move. Then, during the movement of the push plate 1701, the inclined surface of the push plate 1701 applies pressure to the connecting plate 1602. The component force on the upper part, and then under the action of the component force, the connecting plate 1602 drives the sealing rod 1604 to move upward and seal the insertion hole 1601. At this time, the fifth spring 1603 is compressed and has a tendency to recover. After the secondary foaming of the plastic material is completed, the plastic material gradually cools down. At this time, the shape memory alloy wire 1703 gradually returns to normal temperature. Then the shape memory alloy wire 1703 contracts and drives the push plate 1701 to move through the push rod 1702, and compresses the elastic pad 1705. Then, during the movement of the push plate 1701, it gradually... The fifth spring 1603 extends and, through the connecting plate 1602, drives the sealing rod 1604 downwards. As the sealing rod 1604 moves, it gradually disengages from the insertion hole 1601. At this point, the mounting cavity connects to the horizontal groove 1303 via the exhaust pipe 1605. Then, the third spring 1305 extends and resets the mounting plate 1304. During the reset process, the airflow within the horizontal groove 1303 flows through the exhaust pipe 1605 into the mounting cavity. The plastic flows through the insertion hole 1601 on the mounting cavity to the gap between the molded plastic and the bottom wall of the mold cavity 3, thereby avoiding negative pressure between the molded plastic and the mold cavity 3, which would otherwise require a long time for the user to remove the molded plastic. At the same time, during the resetting process of the mounting plate 1304, the impact rod 1307 can be reset and shaken again. Then the impact rod 1307 transmits the vibration to the mold cavity 3, which further facilitates the removal of the molded plastic and further improves the foaming molding efficiency.

[0056] like Figure 2 , Figure 3 , Figure 7 As shown, the bottom mold 2 has an exhaust hole 1801 that communicates with the first air pipe 1104, and a groove 1802 that communicates with the exhaust hole 1801. A sealing plate 1803 for sealing the exhaust hole 1801 is slidably installed in the groove 1802. A cavity 1804 is formed on the elastic pad 1705, and a fifth air pipe 1805 that communicates with the groove 1802 is inserted into the cavity 1804.

[0057] An air intake valve 1806 with its input end connected to the first air tube 1104 is inserted into the top wall of the elastic airbag 1103.

[0058] By adopting the above technical solution, during the extension of the elastic pad 1705, the cavity 1804 draws air from the groove 1802 through the fifth air pipe 1805, creating a negative pressure within the groove 1802. Under this pressure, the sealing plate 1803 moves upward and seals the exhaust port 1801. During the extension of the elastic pad 1705 and the repositioning of the push rod 1702, the airflow within the cavity 1804 flows into the groove 1802 through the fifth air pipe 1805, causing the sealing plate 1803 to move downward. 3. As it moves downwards, it gradually disengages from the exhaust port 1801. At this time, the airflow in the first slide groove 101 flows to the outside through the first air pipe 1104 and the exhaust port 1801. Simultaneously, the airflow in the second slide groove 102 flows to the outside through the second air pipe 1105, the first air pipe 1104, and the exhaust port 1801. At this time, the second spring 107 contracts and drives the second fixed rod 106 to disengage from the fixed groove 104. At this time, the user can restart the electric telescopic rod 6 and cause the output end of the electric telescopic rod 6 to retract. During the retraction of the output end of rod 6, the top mold 9 moves upward through the connecting plate 7 and the first elastic telescopic rod 8. As the top mold 9 moves upward, it gradually disengages from the molded plastic inside the mold cavity 3. At this time, the elastic airbag 1103 extends and drives the buoyancy plate 1102 to reset. During the extension of the elastic airbag 1103, air is drawn from the outside through the air inlet valve 1806, the first air pipe 1104, and the air inlet. During the downward reset of the buoyancy plate 1102, it gradually disengages from the sealing rod 1203. At this time, the reset spring 1204 extends and... The sealing rod 1203 is reset. At the same time, as the buoyancy plate 1102 moves downward, the second rack 1404, gear 1401, and first rack 1403 drive the second elastic telescopic rod 1402 to reset upward. Simultaneously, as the buoyancy plate 1102 moves downward, the second magnet 1504 gradually moves away from the first magnet 1501. At this time, the fourth spring 1503 drives the horizontal plate 1502 to reset and contact the pressure relief hole 1301. That is, after the secondary foaming is completed, the top mold 9 is automatically released from fixation, which improves the foaming molding efficiency.

[0059] Instructions for use: During use, the output end of the electric telescopic rod 6 extends and drives the connecting plate 7 to move downward. As the connecting plate 7 moves downward, the first elastic rod 1306 drives the top mold 9 to move downward. During this downward movement, the top mold 9 gradually contacts the inclined surface of the first fixed rod 103, applying a pushing force to the inclined surface. Under this pushing force, the first fixed rod 103 moves along the first slide groove 101 and compresses the first spring 105. After the top mold 9 reaches the first foaming position, the first fixed rod 103 contacts the fixed groove 104. The first spring 105 extends and drives the first fixing rod 103 to insert into the fixing groove 104, thereby fixing the top mold 9. Then, the plastic raw material after internal mixing flows into the mold cavity 3 through the feed pipe 4. As the raw material in the mold cavity 3 increases, the raw material gradually contacts the buoyancy plate 1102 and drives the buoyancy plate 1102 to move upward. During the upward movement of the buoyancy plate 1102, it will compress the elastic airbag 1103. After the buoyancy plate 1102 is completely inserted into the vertical groove, the elastic airbag 1103 reaches its maximum compression degree, and then the user can stop feeding. Raw material is supplied into mold cavity 3, marking the end of the first foaming. Simultaneously, airflow from the elastic airbag 1103 flows through control component 12 and the first air pipe 1104 into the first slide groove 101, driving the first fixed rod 103 to move away from the fixed groove 104. At this time, the first spring 105 is compressed and tends to recover. As the first fixed rod 103 moves, it gradually disengages from the fixed groove 104, and the second foaming begins. With the second foaming of the raw material in mold cavity 3, the volume of the raw material in the raw material cavity gradually expands, driving the top mold 9 to move upward. An elastic telescopic rod 8 is compressed and has a tendency to recover. Since the second air pipe 1105 is connected to the first air pipe 1104, some airflow will flow through the second air pipe 1105 into the second slide groove 102, and the second fixed rod 106 will tend to move towards the top mold 9. Then, as the top mold 9 moves upward, the top mold 9 drives the fixed groove 104 to gradually contact the second fixed rod 106. Then, the airflow drives the second fixed rod 106 to insert into the fixed groove 104 and stretch the second spring 107, thereby limiting the volume of plastic in the second foaming molding process.After the raw material flows into the mold cavity 3, the original airflow in the mold cavity 3 flows to the outside through the pressure relief hole 1301, thereby avoiding residual airflow in the mold cavity 3 and affecting the molding quality, thus reducing the risk of rework. At the same time, after the airflow flows to the outside, the airflow flows into the horizontal groove 1303 through the pressure relief hole 1301 and the fourth air pipe 1302, increasing the pressure in the horizontal groove 1303. Then, under the action of pressure, the mounting plate 1304 drives the impact rod 1307 to move and stretches and compresses the third spring 1305. During the movement of the impact rod 1307, it gradually comes into contact with the elastic rod 1306, causing the elastic rod 1306 to deform. Then, when the impact rod 1307 disengages from the elastic rod 1306, the elastic rod 1306... Vibration occurs due to its own elasticity, and the elastic rod 1306 can transmit the vibration to the mold cavity 3. During the extension of the elastic pad 1705, the cavity 1804 draws air from the groove 1802 through the fifth air pipe 1805, creating a negative pressure in the groove 1802. Under the pressure, the sealing plate 1803 moves upward and blocks the exhaust hole 1801. During the extension of the elastic pad 1705 and the resetting of the push rod 1702, the airflow in the cavity 1804 flows into the groove 1802 through the fifth air pipe 1805, and moves the sealing plate 1803 downward. During the downward movement of the sealing plate 1803, it gradually loses contact with the exhaust hole 1801. At this time, the airflow in the first slide groove 101 passes through the first... Air pipe 1104 and exhaust port 1801 flow to the outside. At the same time, the airflow in the second slide groove 102 flows to the outside through the second air pipe 1105, the first air pipe 1104, and the exhaust port 1801. At this time, the second spring 107 contracts and drives the second fixed rod 106 to disengage from the fixed groove 104. At this time, the user can restart the electric telescopic rod 6 and cause the output end of the electric telescopic rod 6 to retract. During the retraction of the output end of the electric telescopic rod 6, the top mold 9 is moved upward through the connecting plate 7 and the first elastic telescopic rod 8. During the upward movement of the top mold 9, it gradually disengages from the molded plastic in the mold cavity 3. At this time, the elastic airbag 1103 extends and drives the buoyancy plate 1102 to return to its original position. During the extension of the elastic airbag 1103... During the process, air is drawn in from the outside through the air inlet valve 1806, the first air pipe 1104, and the air inlet. As the buoyancy plate 1102 returns to its downward position, it gradually disengages from the sealing rod 1203. At this time, the return spring 1204 extends and drives the sealing rod 1203 to return to its original position. Simultaneously, as the buoyancy plate 1102 moves downward, the second rack 1404, gear 1401, and first rack 1403 drive the second elastic telescopic rod 1402 to return to its original position. At the same time, as the buoyancy plate 1102 moves downward, it drives the second magnet 1504 to gradually move away from the first magnet 1501. At this time, the fourth spring 1503 drives the horizontal plate 1502 to return to its original position and contact the pressure relief hole 1301. That is, after the secondary foaming is completed, the top mold 9 automatically releases its fixation.

[0060] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A plastic secondary foaming molding machine, comprising a workbench (1), a bottom mold (2) fixedly installed on the top wall of the workbench (1), a mold cavity (3) opened on the bottom mold (2), a feed pipe (4) inserted on the side wall of the mold cavity (3), a top mold (9) provided on the top wall of the workbench (1), and a fixing component (10) cooperating with the top mold (9) provided on the bottom mold (2). Its features are: The fixing component (10) includes a first slide groove (101) and a second slide groove (102) respectively opened on the bottom mold (2). A first fixing rod (103) is slidably installed in the first slide groove (101), and the end of the first fixing rod (103) away from the first spring (105) is an inclined surface. The top mold (9) has a fixing groove (104) that cooperates with the first fixing rod (103). The first spring (105) is fixedly installed between the first fixing rod (103) and the first slide groove (101). A second fixing rod (106) is slidably installed in the second slide groove (102). A second spring (107) is installed between the second fixing rod (106) and the second slide groove (102). The top mold (9) is provided with a driving component (11) that cooperates with the first fixing rod (103) and the second fixing rod (106). The drive assembly (11) includes a vertical groove on the top mold (9), a buoyancy plate (1102) is slidably installed in the vertical groove, an elastic airbag (1103) is installed between the top wall of the buoyancy plate (1102) and the vertical groove, a first air pipe (1104) is inserted into the first slide groove (101), and a control assembly (12) is provided on the top mold (9). The first air pipe (1104) is connected to the elastic airbag (1103) through the control assembly (12). A second air pipe (1105) connected to the first air pipe (1104) is inserted into the second slide groove (102). A mounting frame (5) is fixedly installed on the top wall of the workbench (1). An electric telescopic rod (6) is fixedly installed on the mounting frame (5). A connecting plate (7) is fixedly installed on the output end of the electric telescopic rod (6). A first elastic telescopic rod (8) whose output end is fixedly connected to the top mold (9) is evenly fixedly installed on the bottom wall of the connecting plate (7). The control component (12) includes a sealing rod (1203) that is vertically and slidably sealed on the top mold (9), and a return spring (1204) is installed between the top wall of the sealing rod (1203) and the top mold (9). A third air tube (1205) is inserted into the elastic airbag (1103). A connecting hole (1206) is opened on the sealing rod (1203) to communicate with the third air tube (1205). The first air tube (1104) is connected to the third air tube (1205) through the connecting hole (1206). The top mold (9) has a pressure relief hole (1301) on its bottom wall. A fourth air pipe (1302) is inserted into the side wall of the pressure relief hole (1301). The bottom mold (2) has a horizontal groove (1303) that communicates with the fourth air pipe (1302). An installation plate (1304) is slidably and sealed in the horizontal groove (1303). A third spring (1305) is installed between the installation plate (1304) and the horizontal groove (1303). Elastic rods (1306) extending into the horizontal groove (1303) are uniformly fixed on the bottom wall of the mold cavity (3). Impact rods (1307) for impacting the elastic rods (1306) are uniformly fixed on the top wall of the installation plate (1304). The top mold (9) has an anti-blocking component (14) that cooperates with the pressure relief hole (1301).

2. The plastic secondary foaming molding machine according to claim 1, characterized in that: The anti-blocking component (14) includes an installation groove on the top mold (9), in which a gear (1401) is rotatably installed, and a second elastic telescopic rod (1402) is vertically slidably installed. A first rack (1403) meshing with the gear (1401) is fixedly installed on the second elastic telescopic rod (1402), and a second rack (1404) meshing with the gear (1401) is fixedly installed on the buoyancy plate (1102). The top mold (9) is provided with a linkage component (15) that cooperates with the output end of the second elastic telescopic rod (1402).

3. The plastic secondary foaming molding machine according to claim 2, characterized in that: The linkage assembly (15) includes a linkage groove formed on the top mold (9), and a horizontal plate (1502) for sealing the pressure relief hole (1301) is slidably installed in the linkage groove. A fourth spring (1503) is installed between the horizontal plate (1502) and the linkage groove. A first magnet (1501) is embedded in the horizontal plate (1502), and a second magnet (1504) is embedded in the buoyancy plate (1102). The first magnet (1501) and the second magnet (1504) attract each other.

4. A plastic secondary foaming molding machine according to claim 3, characterized in that: The bottom mold (2) has an installation cavity, and the top wall of the installation cavity has an insertion hole (1601) extending into the mold cavity (3). A connecting plate (1602) is slidably installed in the vertical groove of the installation cavity, and a fifth spring (1603) is installed between the connecting plate (1602) and the installation cavity. A sealing rod (1604) is inserted into the top wall of the connecting plate (1602) due to the sliding cooperation of the insertion hole (1601). An exhaust pipe (1605) extending into the installation cavity is inserted into the side wall of the horizontal groove (1303). The bottom mold (2) has a temperature control component (17) for controlling the movement of the connecting plate (1602).

5. A plastic secondary foaming molding machine according to claim 4, characterized in that: The temperature control component (17) includes a push plate (1701) that is slidably installed in the mounting cavity, and the side wall of the push plate (1701) near the connecting plate (1602) is inclined. A push rod (1702) is fixedly installed on the connecting plate (1602). An elastic pad (1705) and a shape memory alloy wire (1703) are installed together between the push rod (1702) and the bottom mold (2). A heat-conducting rod (1704) that contacts the shape memory alloy wire (1703) is fixedly installed on the mold cavity (3).

6. A plastic secondary foaming molding machine according to claim 5, characterized in that: The bottom mold (2) is provided with an exhaust hole (1801) that communicates with the first air pipe (1104). The bottom mold (2) is provided with a groove (1802) that communicates with the exhaust hole (1801). A sealing plate (1803) for sealing the exhaust hole (1801) is slidably installed in the groove (1802). A cavity (1804) is provided on the elastic pad (1705). A fifth air pipe (1805) that communicates with the groove (1802) is inserted into the cavity (1804).

7. A plastic secondary foaming molding machine according to claim 6, characterized in that: An air inlet valve (1806) with its input end connected to the first air tube (1104) is inserted into the top wall of the elastic airbag (1103).

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