Plastic secondary foaming forming machine

Abstract

The invention discloses a plastic secondary foaming forming machine, and belongs to the technical field of plastic processing equipment, the plastic secondary foaming forming machine comprises a workbench, a bottom die is fixedly mounted on the top wall of the workbench, a die cavity is formed in the bottom die, a feeding pipe is inserted into the side wall of the die cavity, a top die is arranged on the top wall of the workbench, and a feeding pipe is arranged on the side wall of the top die. The bottom die is provided with a fixing assembly matched with the top die. The fixing assembly comprises a first sliding groove and a second sliding groove which are formed in the bottom die. According to the scheme, by arranging a buoyancy plate, after a plastic raw material enters the mold cavity, the buoyancy plate can be driven to move upwards, a first fixing rod is separated from a fixing groove through a control assembly, then after the top mold reaches the position of second foaming forming, a second fixing rod can be automatically inserted into the fixing groove, and the top mold is fixed; therefore, a user does not need to spend time on frequently adjusting the volume in the mold cavity, and the effect of improving the foaming forming efficiency is achieved.

Description

Technical Field

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

[0002] Plastic foam molding is a process in which PE, EVA and other rubber and plastic raw materials are subjected to internal mixing, open mixing, primary compression molding, and then placed in a secondary foam molding machine for steam molding to become the final product.

[0003] Existing secondary foaming of plastics is mostly a two-step foaming method, also known as an intermittent method. In this method, the plastic raw materials are first pre-foamed or front-foamed after being mixed. At this time, the foam or beads have not yet fully expanded and the density is relatively high. The obtained beads are expandable beads; then post-foaming or secondary foaming is carried out. In this process, fully expanded and low-density final foam products such as polystyrene and polyethylene foam plastics are obtained. However, in the actual foaming process, it is generally composed of two sets of molds and injection molding machines. After completing the injection process, secondary foaming is carried out by directly increasing the foaming space. This foaming method is prone to form wrinkles and depressions on the surface of the foaming material, making it difficult to ensure the quality of foaming molding, and even requires re-melting and foaming molding, which seriously affects the foaming molding efficiency.

[0004] In view of the above problems, some solutions are also provided in the prior art. For example, the invention patent application with the announcement number CN112318806A discloses a plastic secondary foaming molding machine. During the secondary foaming process of the device, the movable template can be slowly pushed up by the foaming material to meet the space requirements of the foamed plastic. The foaming material is always in close contact with the inner wall of the mold cavity, and the shaping effect is good, which effectively avoids the occurrence of foaming cavities and surface wrinkles of the foamed plastic, thereby avoiding rework and effectively improving the foaming molding efficiency; however, in actual use, the user needs to manually fix the movable template in the primary foaming, and after the primary foaming is completed, the movable template needs to be released first, and then the movable template in the secondary foaming is fixed, and after the secondary foaming is completed, the user needs to release the movable template again, and reciprocate to fix the movable template, which seriously affects the foaming efficiency, and the user cannot accurately grasp the time of the primary foaming. If the user releases the fixation of the template after the primary foaming in advance or delays, it will affect the foaming molding quality, so there is still a risk of rework, which seriously affects the foaming molding efficiency. Summary of the invention

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a plastic secondary foaming molding machine, which can achieve the purpose of improving the foaming molding efficiency.

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

[0007] A plastic secondary foaming molding machine, including a workbench, a bottom mold is fixedly installed on the top wall of the workbench, a mold cavity is opened on the bottom mold, a feed pipe is inserted on the side wall of the mold cavity, a top mold is arranged on the top wall of the workbench, and a fixing component for cooperating with the top mold is arranged on the bottom mold; The fixing component includes a first chute and a second chute respectively opened on the bottom mold. A first fixing rod is slidably installed in the first chute, and one end of the first fixing rod where the first spring is located is a slope. A fixing groove for cooperating with the first fixing rod is opened on the top mold. A first spring is fixedly installed between the first fixing rod and the first chute. A second fixing rod is slidably installed in the second chute, and a second spring is installed between the second fixing rod and the second chute. A driving component for cooperating with the first fixing rod and the second fixing rod is arranged on the top mold.

[0008] Further, the driving component includes a vertical groove opened on the top mold. A buoyancy plate is slidably installed in the vertical groove. An elastic airbag is installed between the top wall of the buoyancy plate and the vertical groove. A first air pipe is inserted into the first chute, and a control component is arranged on the top mold. The first air pipe is communicated with the elastic airbag through the control component. A second air pipe communicated with the first air pipe is inserted into the second chute. An installation frame is fixedly installed on the top wall of the workbench. An electric telescopic rod is fixedly installed on the installation frame. A connecting plate is fixedly installed on the output end of the electric telescopic rod. A first elastic telescopic rod with an output end fixedly connected to the top mold is uniformly fixedly installed on the bottom wall of the connecting plate.

[0009] Further, the control component includes a sealing rod slidably and hermetically installed on the top mold vertically. A return spring is installed between the top wall of the sealing rod and the top mold. A third air pipe is inserted into the elastic airbag. A communication hole communicated with the third air pipe is opened on the sealing rod, and the first air pipe is communicated with the third air pipe through the communication hole.

[0010] Further, a pressure relief hole is opened on the bottom wall of the top mold. A fourth air pipe is inserted on the side wall of the pressure relief hole. A horizontal groove communicated with the fourth air pipe is opened on the bottom mold. A mounting plate is slidably and hermetically installed in the horizontal groove, and a third spring is installed between the mounting 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 hitting the elastic rods are uniformly fixedly installed on the top wall of the mounting plate. An anti-blocking component for cooperating with the pressure relief hole is arranged on the top mold.

[0011] Further, the anti-blocking component includes an installation groove formed in 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 engaged with the gear is fixedly installed on the second elastic telescopic rod. A second rack engaged with the gear is fixedly installed on the buoyancy plate. A linkage component cooperating with the output end of the second elastic telescopic rod is provided on the top mold.

[0012] Further, the linkage component includes a linkage groove formed in the top mold. A horizontal plate for blocking the pressure relief hole is slidably installed in the linkage groove. A fourth spring is jointly 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.

[0013] Further, an installation cavity is formed in the bottom mold. A jack extending into the mold cavity is formed in the top wall of the installation cavity. A linkage plate is vertically slidably installed in the installation cavity. A fifth spring is jointly installed between the linkage plate and the installation cavity. A plugging rod slidably matched with the jack is inserted on the top wall of the linkage plate. An exhaust pipe extending into the installation cavity is inserted on the side wall of the horizontal groove. A temperature control component for controlling the movement of the linkage plate is provided on the bottom mold.

[0014] Further, the temperature control component includes a push plate slidably installed in the installation cavity. The side wall of the push plate close to the linkage plate is inclined. A push rod is fixedly installed on the linkage plate. An elastic pad and a shape memory alloy wire are jointly installed between the push rod and the bottom mold. A heat conducting rod in contact with the shape memory alloy wire is fixedly installed on the mold cavity.

[0015] Further, an exhaust hole communicated with the first air pipe is formed in the bottom mold. A groove communicated with the exhaust hole is formed in the bottom mold. A sealing plate for blocking the exhaust hole is slidably installed in the groove. A cavity is formed in the elastic pad. A fifth air pipe communicated with the groove is inserted into the cavity.

[0016] Further, an air inlet valve with an input end communicated with the first air pipe is inserted into the top wall of the elastic airbag.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By arranging the buoyancy plate in this solution, after the plastic raw material enters the mold cavity, it will drive the buoyancy plate to move upward, and through the control component, the first fixed rod is separated from the fixed groove. Then, after the top mold reaches the position for the second foaming and forming, the second fixed rod can be automatically inserted into the fixed groove to fix the top mold, so that the user does not need to spend time frequently adjusting the volume in the mold cavity, which improves the foaming and forming efficiency. (2) By setting a pressure relief hole in this solution, after the raw material enters the mold cavity, the residual air in the mold cavity can be removed, avoiding voids in the mold cavity, which may affect the quality of foam molding and lead to the need for time-consuming rework. At the same time, after the air flow reaches the pressure relief hole, the air flow will flow through the fourth air pipe to the horizontal groove, and drive the impact rod to strike the elastic rod through the mounting plate. Then, the elastic rod vibrates under the action of 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, avoiding voids in the mold cavity, which may affect the quality of foam molding and lead to the need for time-consuming rework, and further improving the foam molding efficiency; (3) By setting the shape memory alloy wire in this solution, after the plastic raw material returns to normal temperature, the push rod can drive the push plate to disengage from the linkage plate. At this time, the linkage plate drives the plugging rod to disengage from the jack, and further enables the air flow in the horizontal groove to flow through the jack on the mounting cavity to the gap between the molded plastic and the bottom wall of the mold cavity, thereby avoiding negative pressure between the molded plastic and the mold cavity, which may cause the user to take a long time to remove the molded plastic, and further improving the foam molding efficiency. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a cross-sectional view of the bottom mold and the top mold of the present invention; Figure 3 For the present invention Figure 2 the enlarged view at A; Figure 4 For the present invention Figure 2 the enlarged view at B; Figure 5 For the present invention Figure 2 the enlarged view at C; Figure 6 For the present invention Figure 2 the enlarged view at D; Figure 7 is a combined view of the push plate, push rod, shape memory alloy wire, and elastic pad of the present invention; Figure 8 is a schematic structural diagram of the mounting plate and the impact rod of the present invention.

[0019] Explanation of the reference numerals in the drawings: 1, workbench; 2, bottom mold; 3, mold cavity; 4, feed pipe; 5, mounting frame; 6, electric telescopic rod; 7, connecting plate; 8, first elastic telescopic rod; 9, top mold; 10, fixing assembly; 101, first chute; 102, second chute; 103, first fixing rod; 104, fixing groove; 105, first spring; 106, second fixing rod; 107, second spring; 11. Driving component; 1102. Buoyancy plate; 1103. Elastic airbag; 1104. First air pipe; 1105. Second air pipe; 12. Control component; 1203. Sealing rod; 1204. Return spring; 1205. Third air pipe; 1206. Communication hole; 1301. Pressure relief hole; 1302. Fourth air pipe; 1303. Horizontal groove; 1304. Mounting plate; 1305. Third spring; 1306. Elastic rod; 1307. Impact rod; 14. Anti-blocking component; 1401. Gear; 1402. Second elastic telescopic rod; 1403. First rack; 1404. Second rack; 15. Linkage component; 1501. First magnet; 1502. Horizontal plate; 1503. Fourth spring; 1504. Second magnet; 1601. Jack; 1602. Linkage plate; 1603. Fifth spring; 1604. Plugging rod; 1605. Exhaust pipe; 17. Temperature control component; 1701. Push plate; 1702. Push rod; 1703. Shape memory alloy wire; 1704. Heat conducting rod; 1705. Elastic pad; 1801. Exhaust hole; 1802. Groove; 1803. Sealing plate; 1804. Cavity; 1805. Fifth air pipe; 1806. Intake valve. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figures 1 to 8 , a plastic secondary foaming molding machine, including a workbench 1, a bottom mold 2 is fixedly installed on the top wall of the workbench 1, a mold cavity 3 is opened on the bottom mold 2, a feed pipe 4 is inserted into the side wall of the mold cavity 3, a top mold 9 is arranged on the top wall of the workbench 1, and a fixing component 10 matched with the top mold 9 is arranged on the bottom mold 2; The fixed component 10 includes a first sliding groove 101 and a second sliding groove 102 respectively formed on the bottom die 2. A first fixing rod 103 is slidably installed in the first sliding groove 101, and one end of the first fixing rod 103 where the first spring 105 is located is beveled. A fixing groove 104 cooperating with the first fixing rod 103 is formed on the top die 9. A first spring 105 is fixedly installed between the first fixing rod 103 and the first sliding groove 101. A second fixing rod 106 is slidably installed in the second sliding groove 102. A second spring 107 is installed between the second fixing rod 106 and the second sliding groove 102. A driving component 11 cooperating with the first fixing rod 103 and the second fixing rod 106 is provided on the top die 9.

[0022] The driving component 11 includes a vertical groove formed on the top die 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 sliding groove 101, and a control component 12 is provided on the top die 9. The first air pipe 1104 is communicated with the elastic airbag 1103 through the control component 12. A second air pipe 1105 communicated with the first air pipe 1104 is inserted into the second sliding groove 102. An installation frame 5 is fixedly installed on the top wall of the workbench 1. An electric telescopic rod 6 is fixedly installed on the installation 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 with an output end fixedly connected to the top die 9 is uniformly fixedly installed on the bottom wall of the connecting plate 7.

[0023] The control component 12 includes a sealing rod 1203 vertically and slidably and sealingly installed on the top die 9. A return spring 1204 is installed between the top wall of the sealing rod 1203 and the top die 9. A third air pipe 1205 is inserted into the elastic airbag 1103. A communication hole 1206 communicated with the third air pipe 1205 is formed on the sealing rod 1203, and the first air pipe 1104 is communicated with the third air pipe 1205 through the communication hole 1206.

[0024] During 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 top mold 9 is driven to move downward by the first elastic rod 1306. During the downward movement of the top mold 9, it gradually contacts the inclined surface of the first fixed rod 103 and applies a thrust to the inclined surface of the first fixed rod 103. Then, under the action of the thrust, the first fixed rod 103 moves along the first chute 101 and compresses the first spring 105. After the top mold 9 reaches the first foaming position, the first fixed rod 103 contacts the fixing groove 104. At this time, the first spring 105 extends and drives the first fixed rod 103 to insert into the fixing groove 104, thereby fixing the top mold 9. Then, the plastic raw material after kneading 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, the elastic airbag 1103 is squeezed. After the buoyancy plate 1102 completely enters the vertical groove, the elastic airbag 1103 reaches the maximum compression degree. Then, the user can stop supplying raw material into the mold cavity 3, that is, the first foaming ends at this time. At the same time, the air flow in the elastic airbag 1103 flows into the first chute 101 through the control assembly 12 and the first air pipe 1104, and drives the first fixed rod 103 to move away from the fixing 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 fixing groove 104. At this time, the secondary foaming starts. 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 drives the top mold 9 to move upward. At this time, the first 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, part of the air flow will flow into the second chute 102 through the second air pipe 1105, making the second fixed rod 106 tend to move towards the top mold 9. Then, as the top mold 9 moves upward, the top mold 9 drives the fixing groove 104 to gradually contact the second fixed rod 106. Then, the air flow drives the second fixed rod 106 to insert into the fixing groove 104 and stretches the second spring 107, thereby limiting the volume of the plastic during the secondary foaming process, that is, there is no need for the user to spend time frequently adjusting the volume in the mold cavity 3, which improves the foaming and forming efficiency.

[0025] In the initial state, the reset spring 1204 is in a free extended state. Then, as the buoyancy block moves upward, the buoyancy block gradually contacts the sealing rod 1203 and drives the sealing rod 1203 to move upward. After the buoyancy block completely enters the vertical groove, the sealing rod 1203 drives the communication hole 1206 to communicate with the first air pipe 1104. At this time, the air flow in the elastic airbag 1103 flows through the third air pipe 1205, the communication hole 1206, and the first air pipe 1104 into the first chute 101 and the second chute 102, thereby avoiding the premature flow of the air flow into the first chute 101, which may cause the first fixing rod 103 to be unable to fix the top mold 9 during the first foaming process, affecting the foaming molding quality or even resulting in rework, and further improving the foaming molding efficiency.

[0026] As Figure 2 , Figure 5 shown, a pressure relief hole 1301 is formed in the bottom wall of the top mold 9, a fourth air pipe 1302 is inserted into the side wall of the pressure relief hole 1301, a horizontal groove 1303 communicating with the fourth air pipe 1302 is formed in the bottom mold 2, a mounting plate 1304 is slidably and sealingly installed in the horizontal groove 1303, and a third spring 1305 is jointly installed between the mounting plate 1304 and the horizontal groove 1303. Elastic rods 1306 extending into the horizontal groove 1303 are uniformly and fixedly installed on the bottom wall of the mold cavity 3, and impact rods 1307 for impacting the elastic rods 1306 are uniformly and fixedly installed on the top wall of the mounting plate 1304. An anti-blocking component 14 cooperating with the pressure relief hole 1301 is provided on the top mold 9.

[0027] The anti-blocking component 14 includes a mounting groove formed in the top mold 9, a gear 1401 is rotatably installed in the mounting groove, a second elastic telescopic rod 1402 is vertically slidably installed in the mounting groove, a first rack 1403 meshing with the gear 1401 is fixedly installed on the second elastic telescopic rod 1402, a second rack 1404 meshing with the gear 1401 is fixedly installed on the buoyancy plate 1102, and a linkage component 15 cooperating with the output end of the second elastic telescopic rod 1402 is provided on the top mold 9.

[0028] The linkage component 15 includes a linkage groove formed in the top mold 9, a horizontal plate 1502 for blocking the pressure relief hole 1301 is slidably installed in the linkage groove, a fourth spring 1503 is jointly installed between the horizontal plate 1502 and the linkage groove, a first magnet 1501 is embedded in the horizontal plate 1502, a second magnet 1504 is embedded in the buoyancy plate 1102, and the first magnet 1501 and the second magnet 1504 attract each other.

[0029] By adopting the above technical solution, after the raw material flows into the mold cavity 3, the original air flow in the mold cavity 3 flows to the outside through the pressure relief hole 1301, thereby avoiding the residual air flow in the mold cavity 3 and affecting the molding quality, thus reducing the risk of rework. At the same time, after the air flow flows to the outside, the air flow flows into the horizontal groove 1303 through the pressure relief hole 1301 and the fourth air pipe 1302, and increases the pressure in the horizontal groove 1303. Then, under the action of the pressure, the mounting plate 1304 drives the impact rod 1307 to move and stretches the compression third spring 1305. During the movement of the impact rod 1307, it gradually contacts the elastic rod 1306 and causes the elastic rod 1306 to deform. Then, when the impact rod 1307 disengages from the elastic rod 1306, the elastic rod 1306 vibrates under the action of its own elastic force. Then, the elastic rod 1306 can transmit the vibration into the mold cavity 3, so that the raw material can fill the entire mold cavity 3, avoiding voids in the mold cavity 3, affecting the foaming molding quality, and resulting in the need to spend time on rework treatment, further improving the foaming molding efficiency.

[0030] In the initial state, the fourth spring 1503 is in a free extension state, and at this time, the horizontal plate 1502 contacts the pressure relief hole 1301. During the process of the plastic raw material driving the buoyancy plate 1102 to completely enter the vertical groove, part of the plastic raw material enters the pressure relief hole 1301. During the upward movement of the buoyancy plate 1102, it drives the second rack 1404 to move upward. During the upward movement of the second rack 1404, it drives the first rack 1403 to move downward through the gear 1401. Then, during the downward movement of the first rack 1403, it drives the second elastic telescopic rod 1402 to move downward. During the downward movement of the second elastic telescopic rod 1402, the output end of the second elastic telescopic rod 1402 gradually contacts the horizontal plate 1502. Due to the obstruction of the horizontal plate 1502 at this time, as the second elastic telescopic rod 1402 moves downward, the output end of the second elastic telescopic rod 1402 gradually contracts and has a tendency to recover. At the same time, during the upward movement of the buoyancy plate 1102, it drives the second magnet 1504 to move upward and gradually approaches the first magnet 1501. After the buoyancy plate 1102 completely enters the vertical groove, the distance between the second magnet 1504 and the first magnet 1501 reaches the closest, and at this time, the gravitational force between the first magnet 1501 and the second magnet 1504 reaches the maximum. Then, under the action of the gravitational force, the first magnet 1501 drives the horizontal plate 1502 to approach the second magnet 1504. During the movement of the horizontal plate 1502, 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 raw material in the pressure relief hole 1301, thereby avoiding the residual plastic raw material in the pressure relief hole 1301 from foaming, resulting in the need for the user to spend a long time cleaning the pressure relief hole 1301, which plays a role in improving the foaming molding efficiency.

[0031] As Figure 2 , Figure 6 , Figure 7 shown, an installation cavity is formed in the bottom mold 2, a jack 1601 extending into the mold cavity 3 is formed in the top wall of the installation cavity, a linkage plate 1602 is slidably installed in a vertical groove in the installation cavity, and a fifth spring 1603 is jointly installed between the linkage plate 1602 and the installation cavity. A plugging rod 1604 slidably engaged with the jack 1601 is inserted into the top wall of the linkage plate 1602. An exhaust pipe 1605 extending into the installation cavity is inserted into the side wall of the horizontal groove 1303. A temperature control assembly 17 for controlling the movement of the linkage plate 1602 is provided on the bottom mold 2.

[0032] The temperature control assembly 17 includes a push plate 1701 slidably installed in the installation cavity. The side wall of the push plate 1701 close to the linkage plate 1602 is an inclined surface. A push rod 1702 is fixedly installed on the linkage plate 1602. An elastic pad 1705 and a shape memory alloy wire 1703 are jointly installed between the push rod 1702 and the bottom mold 2. A heat conducting rod 1704 in contact with the shape memory alloy wire 1703 is fixedly installed on the mold cavity 3.

[0033] By adopting the above technical solution, after the raw material enters the mold cavity 3, the raw material first contacts the guiding 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 expand when heated. At this time, during the expansion process of the shape memory alloy wire 1703, the elastic pad 1705 expands and drives the push rod 1702 to move. During the movement of the push rod 1702, the push plate 1701 is driven to move. Then, during the movement of the push plate 1701, the inclined surface of the push plate 1701 exerts an upward component force on the linkage plate 1602. Then, under the action of the component force, the linkage plate 1602 drives the plugging rod 1604 to move upward and plug the jack 1601. At this time, the fifth spring 1603 is compressed and has a tendency to recover. When the secondary foaming of the plastic raw material ends, the plastic raw material gradually cools. At this time, the shape memory alloy wire 1703 gradually returns to its normal temperature, and then the shape memory alloy wire 1703 contracts and drives the push plate 1701 to move through the push rod 1702, compressing the elastic pad 1705. Then, during the movement of the push plate 1701, it gradually disengages from the linkage plate 1602. At this time, the fifth spring 1603 expands and drives the plugging rod 1604 to move downward through the linkage plate 1602. During the movement of the plugging rod 1604, it gradually disengages from the jack 1601. At this time, the installation cavity is communicated with the horizontal groove 1303 through the exhaust pipe 1605. Then, the third spring 1305 expands and drives the mounting plate 1304 to reset. During the reset process of the mounting plate 1304, the air flow in the horizontal groove 1303 is driven to flow into the installation cavity through the exhaust pipe 1605 and flows through the jack 1601 on the installation cavity into the gap between the molded plastic and the bottom wall of the mold cavity 3, so as to avoid the occurrence of negative pressure between the molded plastic and the mold cavity 3, which causes the user to spend a long time to take out the molded plastic. At the same time, during the reset process of the mounting plate 1304, the impact rod 1307 can be driven to reset and the impact rod 1307 is driven to vibrate again. Then, the impact rod 1307 transfers the vibration into the mold cavity 3, further facilitating the taking out of the molded plastic and further improving the foaming molding efficiency.

[0034] As Figure 2 , Figure 3 , Figure 7 shown, the bottom mold 2 is provided with an exhaust hole 1801 communicated with the first air pipe 1104, the bottom mold 2 is provided with a groove 1802 communicated with the exhaust hole 1801, a sealing plate 1803 for plugging the exhaust hole 1801 is slidably installed in the groove 1802, a cavity 1804 is formed in the elastic pad 1705, and a fifth air pipe 1805 communicated with the groove 1802 is inserted into the cavity 1804.

[0035] An air inlet valve 1806 with an input end communicated with the first air pipe 1104 is inserted into the top wall of the elastic airbag 1103.

[0036] By adopting the above technical solution, during the stretching process of the elastic pad 1705, the cavity 1804 sucks air from the groove 1802 through the fifth trachea 1805, making the pressure in the groove 1802 negative. Then, under the action of pressure, the sealing plate 1803 moves upward to block the exhaust hole 1801. During the stretching of the elastic pad 1705 and the resetting of the push rod 1702, the air flow in the cavity 1804 flows through the fifth trachea 1805 into the groove 1802, driving the sealing plate 1803 to move downward. During the downward movement of the sealing plate 1803, it gradually disengages from the exhaust hole 1801. At this time, the air flow in the first chute 101 flows to the outside through the first trachea 1104 and the exhaust hole 1801. At the same time, the air flow in the second chute 102 flows to the outside through the second trachea 1105, the first trachea 1104, and the exhaust hole 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 start the electric telescopic rod 6 again, and the output end of the electric telescopic rod 6 contracts. During the contraction of the output end of the electric telescopic rod 6, the top mold 9 is driven to move 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 plastic formed in the mold cavity 3. At this time, the elastic airbag 1103 stretches and drives the buoyancy plate 1102 to reset. During the stretching of the elastic airbag 1103, it sucks air from the outside through the intake valve 1806, the first trachea 1104, and the intake hole. During the downward resetting of the buoyancy plate 1102, it gradually disengages from the sealing rod 1203. At this time, the reset spring 1204 stretches and drives the sealing rod 1203 to reset. At the same time, during the downward movement of the buoyancy plate 1102, the second rack 1404, the gear 1401, and the first rack 1403 drive the second elastic telescopic rod 1402 to reset upward. At the same time, during the downward movement of the buoyancy plate 1102, 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 reset and contact the pressure relief hole 1301. That is, after the secondary foaming is completed, the fixation of the top mold 9 is automatically released, improving the foaming molding efficiency.

[0037] Usage method: During 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 top mold 9 is driven to move downward through the first elastic rod 1306. During the downward movement of the top mold 9, it gradually contacts the inclined surface of the first fixed rod 103 and applies a thrust to the inclined surface of the first fixed rod 103. Then, under the action of the thrust, the first fixed rod 103 moves along the first chute 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 slot 104. At this time, the first spring 105 extends and drives the first fixed rod 103 to insert into the fixed slot 104, so as to fix the top mold 9. Then, the plastic raw material after kneading 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 squeeze the elastic airbag 1103. After the buoyancy plate 1102 completely enters the vertical groove, the elastic airbag 1103 reaches the maximum compression degree. Then, the user can stop supplying raw material to the mold cavity 3, that is, the first foaming ends at this time. At the same time, the air flow in the elastic airbag 1103 flows into the first chute 101 through the control component 12 and the first air pipe 1104, and drives the first fixed rod 103 to move away from the fixed slot 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 slot 104. At this time, the 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 drives the top mold 9 to move upward. At this time, the first 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, part of the air flow will flow into the second chute 102 through the second air pipe 1105, and make the second fixed rod 106 tend to move towards the top mold 9. Then, as the top mold 9 moves upward, the top mold 9 drives the fixed slot 104 to gradually contact the second fixed rod 106. Then, the air flow drives the second fixed rod 106 to insert into the fixed slot 104 and stretch the second spring 107, so as to limit the plastic volume during the secondary foaming process;After the raw material flows into the cavity 3, the original air flow in the cavity 3 flows to the outside through the pressure relief hole 1301, so as to avoid the residual air flow in the cavity 3 and affect the molding quality, thereby reducing the risk of rework. At the same time, after the air flow flows to the outside, the air flow flows into the horizontal groove 1303 through the pressure relief hole 1301 and the fourth air pipe 1302, and increases the pressure in the horizontal groove 1303. Then, under the action of the pressure, the mounting plate 1304 drives the impact rod 1307 to move and stretches the compression third spring 1305. During the movement of the impact rod 1307, it gradually contacts the elastic rod 1306 and causes the elastic rod 1306 to deform. Then, when the impact rod 1307 is separated from the elastic rod 1306, the elastic rod 1306 vibrates under the action of its own elastic force, and then the elastic rod 1306 can transmit the vibration into the cavity 3; During the extension of the elastic pad 1705, the cavity 1804 sucks air from the groove 1802 through the fifth air pipe 1805, making the pressure in the groove 1802 negative. Then, under the action of the pressure, the sealing plate 1803 moves upward and blocks the exhaust hole 1801. During the process of the elastic pad 1705 extending and driving the push rod 1702 to reset, the air flow in the cavity 1804 flows into the groove 1802 through the fifth air pipe 1805, driving the sealing plate 1803 to move downward. During the downward movement of the sealing plate 1803, it gradually separates from the exhaust hole 1801. At this time, the air flow in the first chute 101 flows to the outside through the first air pipe 1104 and the exhaust hole 1801. At the same time, the air flow in the second chute 102 flows to the outside through the second air pipe 1105, the first air pipe 1104, and the exhaust hole 1801. At this time, the second spring 107 contracts and drives the second fixed rod 106 to separate from the fixed groove 104. At this time, the user can start the electric telescopic rod 6 again, and the output end of the electric telescopic rod 6 contracts. During the contraction of the output end of the electric telescopic rod 6, the top mold 9 is driven to move upward through the connecting plate 7 and the first elastic telescopic rod 8. During the upward movement of the top mold 9, it gradually separates from the plastic molded in the 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, it sucks air from the outside through the air inlet valve 1806, the first air pipe 1104, and the air inlet hole. During the downward reset of the buoyancy plate 1102, it gradually separates from the sealing rod 1203. At this time, the reset spring 1204 extends and drives the sealing rod 1203 to reset. At the same time, during the downward movement of the buoyancy plate 1102, the second rack 1404, the gear 1401, and the first rack 1403 drive the second elastic telescopic rod 1402 to reset upward. At the same time, during the downward movement of the buoyancy plate 1102, 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 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.;

[0038] The above are only the preferred specific embodiments of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A plastic secondary foaming molding machine, comprising a workbench (1), a bottom mold (2) fixedly mounted on the top wall of the workbench (1), a mold cavity (3) formed on the bottom mold (2), a feed pipe (4) inserted into the side wall of the mold cavity (3), a top mold (9) formed on the top wall of the workbench (1), and a fixing component (10) cooperating with the top mold (9) formed on the bottom mold (2); Features: The fixing assembly (10) comprises a first slide groove (101) and a second slide groove (102) respectively provided on the bottom mold (2); a first fixing rod (103) is slidably installed in the first slide groove (101), and one end of a first spring (105) of the first fixing rod (103) is an inclined surface; a fixing groove (104) cooperating with the first fixing rod (103) is provided on the top mold (9); a 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); and a driving assembly (11) cooperating with the first fixing rod (103) and the second fixing rod (106) is provided on the top mold (9).

2. A plastic secondary foaming molding machine according to claim 1, characterized in that: The driving assembly (11) comprises a vertical groove opened on the top mold (9), a buoyancy plate (1102) is slidably mounted in the vertical groove, an elastic air bag (1103) is installed between the top wall of the buoyancy plate (1102) and the vertical groove, a first air pipe (1104) is inserted on 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 air bag (1103) through the control assembly (12), and a second air pipe (1105) connected to the first air pipe (1104) is inserted on the second slide groove (102), a mounting frame (5) is fixedly mounted on the top wall of the workbench (1), an electric telescopic rod (6) is fixedly mounted on the mounting frame (5), a connecting plate (7) is fixedly mounted on the output end of the electric telescopic rod (6), and a first elastic telescopic rod (8) whose output end is fixedly connected to the top mold (9) is evenly fixedly mounted on the bottom wall of the connecting plate (7).

3. A plastic secondary foaming molding machine according to claim 2, characterized in that: The control component (12) comprises a sealing rod (1203) which is vertically slidably sealed and 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 pipe (1205) is inserted into the elastic air bag (1103), a connecting hole (1206) which is connected to the third air pipe (1205) is opened on the sealing rod (1203), and the first air pipe (1104) is connected to the third air pipe (1205) through the connecting hole (1206).

4. A plastic secondary foaming molding machine according to claim 3, characterized in that: A pressure relief hole (1301) is provided on the bottom wall of the top mold (9), a fourth air pipe (1302) is inserted on the side wall of the pressure relief hole (1301), a horizontal groove (1303) in communication with the fourth air pipe (1302) is provided on the bottom mold (2), a mounting plate (1304) is slidably sealed in the horizontal groove (1303), and a third spring (1305) is installed between the mounting plate (1304) and the horizontal groove (1303), an elastic rod (1306) extending into the horizontal groove (1303) is evenly fixedly installed on the bottom wall of the mold cavity (3), an impact rod (1307) for impacting the elastic rod (1306) is evenly fixedly installed on the top wall of the mounting plate (1304), and an anti-blocking component (14) cooperating with the pressure relief hole (1301) is provided on the top mold (9).

5. A plastic secondary foaming molding machine according to claim 4, characterized in that: The anti-blocking component (14) comprises a mounting groove provided on the top mold (9), a gear (1401) being rotatably mounted in the mounting groove, a second elastic telescopic rod (1402) being vertically slidably mounted in the mounting groove, a first rack (1403) meshing with the gear (1401) being fixedly mounted on the second elastic telescopic rod (1402), a second rack (1404) meshing with the gear (1401) being fixedly mounted on the buoyancy plate (1102), and a linkage component (15) cooperating with an output end of the second elastic telescopic rod (1402) being provided on the top mold (9).

6. A plastic secondary foaming molding machine according to claim 5, characterized in that: The linkage assembly (15) comprises a linkage groove formed on the top mold (9), a horizontal plate (1502) for blocking the pressure relief hole (1301) being slidably mounted in the linkage groove, a fourth spring (1503) being mounted between the horizontal plate (1502) and the linkage groove, a first magnet (1501) being embedded in the horizontal plate (1502), a second magnet (1504) being embedded in the buoyancy plate (1102), and the first magnet (1501) and the second magnet (1504) being attracted to each other.

7. A plastic secondary foaming molding machine according to claim 6, characterized in that: The bottom mold (2) is provided with an installation cavity, the top wall of the installation cavity is provided with a socket (1601) extending into the mold cavity (3), a linkage plate (1602) is slidably installed in the vertical groove in the installation cavity, and a fifth spring (1603) is installed between the linkage plate (1602) and the installation cavity, a blocking rod (1604) is inserted into the top wall of the linkage plate (1602) for slidingly matching with the socket (1601), an exhaust pipe (1605) extending into the installation cavity is inserted into the side wall of the horizontal groove (1303), and a temperature control component (17) for controlling the movement of the linkage plate (1602) is provided on the bottom mold (2).

8. A plastic secondary foaming molding machine according to claim 7, characterized in that: The temperature control component (17) comprises a push plate (1701) slidably mounted in the mounting cavity, and the side wall of the push plate (1701) close to the linkage plate (1602) is an inclined surface, a push rod (1702) is fixedly mounted on the linkage plate (1602), an elastic pad (1705) and a memory alloy wire (1703) are installed between the push rod (1702) and the bottom mold (2), and a heat conducting rod (1704) in contact with the memory alloy wire (1703) is fixedly mounted on the mold cavity (3).

9. A plastic secondary foaming molding machine according to claim 8, characterized in that: The bottom mold (2) is provided with an exhaust hole (1801) connected to the first air pipe (1104), the bottom mold (2) is provided with a groove (1802) connected to the exhaust hole (1801), a sealing plate (1803) for sealing the exhaust hole (1801) is slidably installed in the groove (1802), the elastic pad (1705) is provided with a cavity (1804), and a fifth air pipe (1805) connected to the groove (1802) is inserted into the cavity (1804).

10. A plastic secondary foaming molding machine according to claim 2, characterized in that: An air inlet valve (1806) whose input end is connected to the first air pipe (1104) is inserted on the top wall of the elastic airbag (1103).

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