A negative pressure integrated vacuum forming machine and method

Abstract

This invention relates to the field of vacuum forming machine technology, and proposes a negative pressure integrated vacuum forming machine and method. The machine includes a support platform, a mounting frame fixedly connected to the top of the support platform, a material feeding frame on the inner side of the mounting frame, a lifting mechanism on the inner side of the mounting frame, an infrared heater fixedly connected to the top of the inner side of the mounting frame, and a vacuum forming mechanism below the material feeding frame. The vacuum forming mechanism includes a mold, with an air cavity at the bottom of the inner side of the mold. A three-way pipe communicating with the interior of the air cavity is fixedly connected to the bottom of the mold. One end of the three-way pipe is fixedly connected to an air outlet pipe, and the other end is fixedly connected to an air inlet pipe. A dual-axis motor is fixedly installed inside the support platform. An air extraction component is provided at the outlet end of the air outlet pipe, and an air inlet component is provided at the inlet end of the air inlet pipe. This invention effectively solves the technical defects of traditional vacuum forming machines through uniform negative pressure adsorption in the air cavity, rapid cooling in the annular cavity, non-destructive positive pressure demolding, and integrated power transmission.

Description

Technical Field

[0001] This invention relates to the field of vacuum forming machine technology, specifically to a negative pressure integrated vacuum forming machine and method. Background Technology

[0002] Vacuum forming is a widely used plastic processing technology. It involves heating and softening a plastic sheet, then using negative pressure to adhere it to the surface of a mold. After cooling and solidification, the desired product shape is obtained. This technology is applied in packaging, automotive parts, and appliance housings, offering advantages such as low cost, high efficiency, and strong adaptability. Traditional vacuum forming machines typically include a heating system, a mold, and a vacuum suction device. However, with industry development, the requirements for product precision, production efficiency, and automation are constantly increasing.

[0003] Existing technologies are gradually revealing many limitations, including the following technical defects:

[0004] First, existing vacuum forming machines rely on simple vacuum pump systems for air extraction, which may lead to uneven distribution of negative pressure in the mold air chamber, making it impossible for the plastic sheet to fit tightly to the mold contour. This not only affects the accuracy of replicating product details, but also easily produces air bubbles or wrinkles. For example, in the existing technology, unreasonable pore layout or slow air extraction speed will reduce the adsorption effect.

[0005] Secondly, existing vacuum forming machines often rely on natural cooling or simple air cooling, which has low cooling efficiency, prolongs the product setting time, reduces production efficiency, and uneven cooling may also lead to product deformation or internal stress concentration.

[0006] Third, existing vacuum forming machines rely heavily on mechanical ejectors or manual operation for demolding, which can easily scratch the product surface. Especially for thin-walled or complex structural parts, the lack of a positive pressure-assisted demolding mechanism can cause products to stick to the mold and increase the scrap rate.

[0007] In view of this, the present invention proposes a negative pressure integrated vacuum forming machine and method. Summary of the Invention

[0008] This invention proposes a negative pressure integrated vacuum forming machine and method, which solves the problem in the prior art that plastic sheets cannot be tightly fitted to the mold contour and are prone to bubbles or wrinkles.

[0009] The technical solution of the present invention is as follows: A negative pressure integrated vacuum forming machine includes a support platform, a mounting frame fixedly connected to the top of the support platform, a feeding frame for placing plastic sheets provided on the inner side of the mounting frame, a lifting mechanism for driving the feeding frame to move vertically provided on the inner side of the mounting frame, a positioning mechanism for fixing the plastic sheets provided on the mounting frame, an infrared heater for heating the plastic sheets fixedly connected to the top of the inner side of the mounting frame, and a vacuum forming mechanism provided below the feeding frame;

[0010] The vacuum forming mechanism includes a mold fixedly connected to the top of a support platform. An air chamber is formed at the bottom of the inner side of the mold. Several air holes communicating with the groove of the mold are formed on the top wall of the air chamber. A three-way pipe communicating with the interior of the air chamber is fixedly connected to the bottom of the mold. One end of the three-way pipe is fixedly connected to an air outlet pipe, and the other end is fixedly connected to an air inlet pipe. A dual-axis motor is fixedly installed inside the support platform. The outlet end of the air outlet pipe is equipped with an air extraction component that, by cooperating with the forward rotation of the output shaft of the dual-axis motor, draws air out of the air chamber. Preferably, the inlet end of the air inlet pipe is equipped with an inflation component that, by cooperating with the reverse rotation of the output shaft of the dual-axis motor, inflates the air chamber.

[0011] Preferably, a first solenoid valve is fixedly connected to the air outlet pipe, and a second solenoid valve is fixedly connected to the air inlet pipe.

[0012] Preferably, the inner side of the mold has an annular cavity, and the side wall of the annular cavity preferably has a plurality of heat dissipation holes communicating with the groove of the mold. Preferably, the outer side of the mold is fixedly connected to an air supply pipe communicating with the interior of the annular cavity, and the inlet end of the air supply pipe preferably has a blower that blows air into the interior of the air supply pipe when the air extraction component is activated.

[0013] Preferably, the lifting mechanism includes two lugs fixedly connected to both ends of the feeding frame, one end of the mounting frame is fixedly connected to a vertically arranged guide rod, and the other end of the mounting frame is rotatably connected to a lead screw arranged parallel to the guide rod. One lug is slidably connected to the guide rod, and the other lug is threadedly connected to the lead screw. A drive motor is fixedly installed on the top of the mounting frame, and the output shaft of the drive motor is fixedly connected to the lead screw.

[0014] Preferably, the positioning mechanism includes two fixed seats that are respectively fixedly connected to the top ends of the feeding frame. A cylinder is fixedly connected to the top of each of the two fixed seats. A mounting plate is fixedly connected to the output end of each of the two cylinders. Elastic members are provided at both ends of the mounting plate. A pressure plate is fixedly connected to the bottom end of each of the two elastic members.

[0015] Preferably, the elastic element includes a slide rod that passes through the mounting plate, a limit block is fixedly connected to the top of the slide rod, the bottom of the slide rod is fixedly connected to the pressure plate, and a spring is sleeved on the slide rod, with the two ends of the spring abutting against the mounting plate and the pressure plate respectively.

[0016] Preferably, the air extraction component includes a vacuum pump body fixedly installed inside the support platform. The air inlet of the vacuum pump body is connected to the outlet end of the air outlet pipe. A first ratchet is fixedly connected to the end of the impeller shaft of the vacuum pump body. A first wheel is fixedly connected to one output shaft of the dual-shaft motor. A plurality of first pawls arranged in a ring are rotatably connected to the outer edge of the first wheel. All of the first pawls are engaged with the first ratchet.

[0017] Preferably, the inflation component includes an air pump fixedly installed inside the support platform, the air pump's outlet being connected to the inlet end of the air inlet pipe, the end of the air pump's impeller shaft being fixedly connected to a second ratchet, the other output shaft of the dual-shaft motor being fixedly connected to a second wheel, and the outer edge of the second wheel being rotatably connected to a plurality of second pawls arranged in a ring, all of which engage with the second ratchet.

[0018] Preferably, the blower component preferably includes a blower body fixedly installed inside the support platform, preferably the air outlet of the blower body preferably is connected to the inlet end of the air supply pipe preferably, preferably the end of the impeller shaft of the blower body preferably is fixedly connected to a first bevel gear preferably, and preferably the impeller shaft of the vacuum pump body is fixedly connected to a second bevel gear preferably meshing with the first bevel gear preferably.

[0019] This invention also provides a method for using a direct negative pressure integrated vacuum forming machine, comprising the following steps:

[0020] S1: Place the plastic sheet into the feeding frame, and then use the positioning mechanism to stably fix the plastic sheet in the feeding frame;

[0021] S2: Start the lifting mechanism to drive the feeding frame to move the plastic sheet upwards, so that the feeding frame moves to the heating area of ​​the infrared heater;

[0022] S3: Activate the infrared heater to uniformly heat the plastic sheet inside the feeding frame, softening it to a state with good plasticity. The heating time and temperature can be precisely set according to the material and thickness.

[0023] S4: After heating is complete, turn off the infrared heater and start the lifting mechanism to drive the feeding frame to move downwards, so that the softened plastic sheet covers the mold. Then control the positioning mechanism to release the plastic sheet, and at the same time start the output shaft of the dual-axis motor to rotate in the forward direction, so that the air extraction component draws out the air inside the air chamber to form a negative pressure state, so that the air holes tightly adhere the softened plastic sheet to the mold surface, perfectly replicating the mold's outline and details.

[0024] S5: When the exhaust component is working, the blower blows cold air into the air supply pipe, and then guides it into the annular cavity through the air supply pipe. Then, it is evenly blown onto the upper surface of the plastic sheet in the mold through each heat dissipation hole, so that the plastic sheet can be cooled and shaped quickly.

[0025] S6: After molding, the output shaft of the dual-axis motor is started to rotate in the opposite direction, causing the inflation component to introduce air into the air inlet pipe, which fills the air chamber with gas and increases the pressure. This causes the air pores to exert an upward air thrust on the molded plastic sheet and separate it from the mold, thus making the plastic sheet automatically demolded.

[0026] The working principle and beneficial effects of this invention are as follows:

[0027] 1. The suction component creates a stable negative pressure by rapidly suctioning air, allowing the plastic sheet to fit tightly against the mold contour, perfectly replicating details and avoiding bubbles or wrinkles caused by slow suction or unreasonable pore layout in traditional technologies; the dual-axis motor drives the suction component in the forward direction and the inflation component in the reverse direction, combined with the first and second solenoid valves, to achieve precise switching between suction and inflation, reducing manual intervention.

[0028] 2. The cold air is distributed through the annular cavity and heat dissipation holes and blown evenly onto the upper surface of the plastic sheet, avoiding deformation or internal stress concentration caused by natural cooling or simple air cooling, shortening the setting time, improving production efficiency, and the power of the blowing and exhaust components is reused to reduce energy consumption, which is in line with the concept of green manufacturing.

[0029] 3. Positive pressure demolding replaces mechanical ejector pins, avoiding scratches on the product surface. It is especially suitable for thin-walled or complex structural parts, reducing the scrap rate. The inflatable parts adopt a ratchet and pawl mechanism to ensure unidirectional transmission and a fast and stable demolding process. Attached Figure Description

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Figure 1 This is a schematic diagram of the structure of a negative pressure integrated vacuum forming machine according to the present invention;

[0032] Figure 2 This is a schematic diagram of the vacuum forming mechanism of the present invention;

[0033] Figure 3 This is a schematic diagram of the lifting mechanism of the present invention;

[0034] Figure 4 This is a schematic diagram of the positioning mechanism of the present invention;

[0035] Figure 5 for Figure 4 Enlarged structural diagram at point A;

[0036] Figure 6This is a schematic diagram of the structure of the air extraction component of the present invention;

[0037] Figure 7 for Figure 6 Enlarged structural diagram at point B;

[0038] Figure 8 This is a schematic diagram of the structure of the inflatable component of the present invention;

[0039] Figure 9 for Figure 7 Enlarged structural diagram at point C;

[0040] Figure 10 This is a schematic diagram of the structure of the blower component of the present invention.

[0041] In the diagram: 1. Support platform; 2. Mounting frame; 3. Feeding frame; 4. Lifting mechanism; 41. Ear block; 42. Guide rod; 43. Lead screw; 44. Drive motor; 5. Positioning mechanism; 51. Fixed seat; 52. Cylinder; 53. Mounting plate; 54. Elastic element; 541. Slide rod; 542. Spring; 543. Limiting block; 55. Pressure plate; 6. Infrared heater; 7. Vacuum forming mechanism; 71. Mold; 72. Air chamber; 73. Air hole; 74. T-pipe; 75. Air outlet pipe; 76. 77. Solenoid valve; 78. Inlet pipe; 79. Second solenoid valve; 70. Dual-axis motor; 71. Air extraction component; 72. Vacuum pump body; 73. First ratchet; 74. First pawl; 75. Inflation component; 76. Air pump; 77. Second ratchet; 78. Second pawl; 79. Second pawl; 70. Annular cavity; 71. Heat dissipation hole; 72. Air supply pipe; 73. Blower component; 74. Blower body; 75. First bevel gear; 76. Second bevel gear. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] like Figures 1 to 10As shown, this embodiment proposes a negative pressure integrated vacuum forming machine, including a support platform 1, a mounting frame 2 fixedly connected to the top of the support platform 1, a feeding frame 3 for placing plastic sheets provided on the inner side of the mounting frame 2, a lifting mechanism 4 for driving the feeding frame 3 to move vertically provided on the inner side of the mounting frame 2, a positioning mechanism 5 for fixing the plastic sheets provided on the mounting frame 2, an infrared heater 6 for heating the plastic sheets fixedly connected to the top of the inner side of the mounting frame 2, and a vacuum forming mechanism 7 provided below the feeding frame 3.

[0044] The vacuum forming mechanism 7 includes a mold 71 fixedly connected to the top of the support platform 1. An air cavity 72 is formed at the bottom of the inner side of the mold 71. Several air holes 73 communicating with the groove of the mold 71 are formed on the top wall of the air cavity 72. A three-way pipe 74 communicating with the interior of the air cavity 72 is fixedly connected to the bottom of the mold 71. One end of the three-way pipe 74 is fixedly connected to an air outlet pipe 75, and the other end is fixedly connected to an air inlet pipe 77. A first solenoid valve 76 is fixedly connected to the air outlet pipe 75, and a second solenoid valve 78 is fixedly connected to the air inlet pipe 77. A dual-axis motor 79 is fixedly installed inside the support platform 1, and the outlet of the air outlet pipe 75... The mold 71 is provided with an air extraction component 70 that extracts air from the air chamber 72 by cooperating with the forward rotation of the output shaft of the dual-axis motor 79. The inlet end of the air inlet pipe 77 is provided with an air filling component 7a that inflates the air chamber 72 by cooperating with the reverse rotation of the output shaft of the dual-axis motor 79. The inner side of the mold 71 is provided with an annular cavity 7b. The side wall of the annular cavity 7b is provided with several heat dissipation holes 7c that communicate with the groove of the mold 71. The outer side of the mold 71 is fixedly connected with an air supply pipe 7d that communicates with the inside of the annular cavity 7b. The inlet end of the air supply pipe 7d is provided with a blower component 7e that blows air into the air supply pipe 7d by cooperating with the activation of the air extraction component 70.

[0045] In this embodiment, the vacuum forming machine is based on a support platform 1, with a mounting frame 2 fixed on it. A feeding frame 3 is used to place plastic sheets and is vertically moved by a lifting mechanism 4. A positioning mechanism 5 fixes the plastic sheet at the top of the feeding frame to prevent displacement. An infrared heater 6 is installed at the top inner side of the mounting frame to uniformly heat the plastic sheet. The vacuum forming mechanism 7 is located below the feeding frame and includes a mold 71, an air chamber 72, air holes 73, a three-way pipe 74, an air outlet pipe 75, an air inlet pipe 77, and a dual-axis motor 79. During operation, the dual-axis motor 79 drives the suction component 70 and the inflation component 7a respectively by rotating the output shaft in either the forward or reverse direction, achieving negative pressure adsorption and positive pressure demolding of the air chamber 72. The air chamber 72 and air holes 73 are evenly distributed, ensuring that the plastic sheet is tightly adsorbed onto the surface of the mold 71, perfectly replicating the contour details and improving product accuracy.

[0046] In a further preferred embodiment of the present invention, the lifting mechanism 4 includes two lugs 41 respectively fixedly connected to both ends of the feeding frame 3. One end of the mounting frame 2 is fixedly connected to a vertically arranged guide rod 42, and the other end of the mounting frame 2 is rotatably connected to a lead screw 43 arranged parallel to the guide rod 42. One lug 41 is slidably connected to the guide rod 42, and the other lug 41 is threadedly connected to the lead screw 43. A drive motor 44 is fixedly installed on the top of the mounting frame 2, and the output shaft of the drive motor 44 is fixedly connected to the lead screw 43.

[0047] In this embodiment, the lifting mechanism 4 is used to drive the material feeding frame 3 to move vertically, and the specific implementation process is as follows:

[0048] By starting the drive motor 44, the lead screw 43 is driven to rotate, so that the lead screw 43 and the corresponding lug 41 rotate relative to each other, thereby driving the feeding frame 3 to move up and down along the guide rod 42; the combination of the lead screw 43 and the guide rod 42 ensures that the feeding frame 3 moves smoothly and avoids deviation, so that the plastic sheet accurately enters the heating area or covers the mold.

[0049] In a further preferred embodiment of the present invention, the positioning mechanism 5 includes two fixed seats 51 respectively fixedly connected to the top ends of the feeding frame 3. A cylinder 52 is fixedly connected to the top of each of the two fixed seats 51. A mounting plate 53 is fixedly connected to the output end of each of the two cylinders 52. Elastic members 54 are provided at both ends of the mounting plate 53. A pressure plate 55 is fixedly connected to the bottom end of each of the two elastic members 54. The elastic member 54 includes a slide rod 541 that passes through the mounting plate 53. A limit block 543 is fixedly connected to the top of the slide rod 541. The bottom of the slide rod 541 is fixedly connected to the pressure plate 55. A spring 542 is sleeved on the slide rod 541. The two ends of the spring 542 abut against the mounting plate 53 and the pressure plate 55 respectively.

[0050] In this embodiment, the cylinder 52 pushes the mounting plate 53 down, and the spring 542 is compressed, so that the pressure plate 55 flexibly contacts the plastic sheet through the slide rod 541 to provide buffer pressure; the spring 542 buffers and prevents the pressure plate 55 from excessively squeezing the plastic sheet, preventing material deformation or damage, which is especially suitable for thin-walled or fragile materials.

[0051] In a further preferred embodiment of the present invention, the air extraction component 70 includes a vacuum pump body 701 fixedly installed inside the support platform 1. The air inlet of the vacuum pump body 701 is connected to the outlet end of the air outlet pipe 75. A first ratchet 702 is fixedly connected to the end of the impeller shaft of the vacuum pump body 701. A first rotating wheel 703 is fixedly connected to one output shaft of the dual-shaft motor 79. A plurality of first pawls 704 arranged in a ring are rotatably connected to the outer edge of the first rotating wheel 703. The plurality of first pawls 704 are all engaged with the first ratchet 702.

[0052] In this embodiment, when the output shaft of the dual-axis motor 79 rotates in the forward direction, the first rotating wheel 703 drives the first pawl 704 to engage the first ratchet 702, driving the impeller shaft of the vacuum pump body 701 to rotate, drawing the air in the air chamber 72 out through the air outlet pipe 75 to form a negative pressure. The air outlet pipe 75 is equipped with a first solenoid valve 76 to control the airflow. The ratchet and pawl mechanism ensures unidirectional transmission, avoids reverse rotation, has a fast air extraction speed, stable negative pressure, and improves adsorption reliability.

[0053] In a further preferred embodiment of the present invention, the inflation component 7a includes an air pump 7a1 fixedly installed inside the support platform 1. The air outlet of the air pump 7a1 is connected to the inlet end of the air inlet pipe 77. A second ratchet 7a2 is fixedly connected to the end of the impeller shaft of the air pump 7a1. A second rotating wheel 7a3 is fixedly connected to the other output shaft of the dual-shaft motor 79. A plurality of second pawls 7a4 arranged in a ring are rotatably connected to the outer edge of the second rotating wheel 7a3. The plurality of second pawls 7a4 are all engaged with the second ratchet 7a2. The tooth groove opening direction of the second ratchet 7a2 is opposite to that of the first ratchet 702.

[0054] In this embodiment, when the output shaft of the dual-axis motor 79 rotates in the opposite direction, the second wheel 7a3 drives the second pawl 7a4 to mesh with the second ratchet 7a2, whose tooth groove opening direction is opposite to that of the first ratchet. This drives the air pump 7a1 to inflate the air inlet pipe 77. The air inlet pipe 77 is equipped with a second solenoid valve 78 to regulate the airflow. Positive pressure inflation causes the air hole 73 to apply an upward pushing force to the molded part, achieving non-destructive demolding and reducing product adhesion or damage.

[0055] In a further preferred embodiment of the present invention, the blower 7e includes a blower body 7e1 fixedly installed inside the support platform 1. The air outlet of the blower body 7e1 is connected to the inlet end of the air supply pipe 7d. A first bevel gear 7e2 is fixedly connected to the end of the impeller shaft of the blower body 7e1. A second bevel gear 7e3 that meshes with the first bevel gear 7e2 is fixedly connected to the impeller shaft of the vacuum pump body 701.

[0056] In this embodiment, when the vacuum pump 70 is working, the impeller shaft of the vacuum pump body 701 meshes with the first bevel gear 7e2 via the second bevel gear 7e3, driving the blower body 7e1 to blow air into the air supply pipe 7d. The airflow enters the annular cavity 7b of the mold 71 and is evenly blown onto the upper surface of the plastic sheet through the heat dissipation holes 7c. The cooling system is driven by the power of the vacuum pump 70, requiring no additional energy and achieving energy-saving integration. The annular cavity 7b and the heat dissipation holes 7c are reasonably distributed to avoid uneven cooling that could lead to deformation and improve product consistency.

[0057] A further preferred embodiment of the present invention provides a method for using a negative pressure integrated vacuum forming machine, comprising the following steps:

[0058] S1: Place the plastic sheet into the feeding frame 3, and then fix the plastic sheet stably in the feeding frame 3 by the positioning mechanism 5;

[0059] S2: Start the lifting mechanism 4 to drive the feeding frame 3 to move the plastic sheet upward, so that the feeding frame 3 moves to the heating area of ​​the infrared heater 6;

[0060] S3: Start the infrared heater 6 to uniformly heat the plastic sheet inside the feeding frame 3, softening it to a state with good plasticity. The heating time and temperature can be precisely set according to the material and thickness.

[0061] S4: After heating is completed, turn off the infrared heater 6 and start the lifting mechanism 4 to drive the feeding frame 3 to move downward, so that the softened plastic sheet covers the mold 71. Then control the positioning mechanism 5 to release the plastic sheet, and at the same time start the output shaft of the dual-axis motor 79 to rotate in the forward direction, so that the air extraction component 70 extracts the air inside the air chamber 72 to form a negative pressure state, so that the air hole 73 tightly adheres the softened plastic sheet to the surface of the mold 71, perfectly replicating the contour and details of the mold.

[0062] S5: When the exhaust component 70 is working, the blower component 7e blows cold air into the air supply pipe 7d, and then guides it into the annular cavity 7b through the air supply pipe 7d. Then, it is evenly blown onto the upper surface of the plastic sheet in the mold 71 by the heat dissipation holes 7c, so that the plastic sheet can be cooled and shaped quickly.

[0063] S6: After molding, the output shaft of the dual-axis motor 79 is started to rotate in the opposite direction, so that the inflator 7a introduces air into the air inlet pipe 77, so that the air chamber 72 is filled with gas and the pressure increases, so that the air hole 73 applies an upward air thrust to the molded plastic sheet and separates it from the mold 71, thus making the plastic sheet automatically demolded.

[0064] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A negative pressure integrated vacuum forming machine, comprising a support platform (1), wherein a mounting frame (2) is fixedly connected to the top of the support platform (1), a feeding frame (3) for placing plastic sheets is provided on the inner side of the mounting frame (2), a lifting mechanism (4) for driving the feeding frame (3) to move vertically is provided on the inner side of the mounting frame (2), and a positioning mechanism (5) for fixing the plastic sheets is provided on the mounting frame (2), characterized in that, An infrared heater (6) for heating plastic sheets is fixedly connected to the top of the inner side of the mounting frame (2), and a vacuum forming mechanism (7) is provided below the feeding frame (3). The vacuum forming mechanism (7) includes a mold (71) fixedly connected to the top of the support platform (1). An air cavity (72) is provided at the bottom of the inner side of the mold (71). Several air holes (73) communicating with the groove of the mold (71) are provided on the top wall of the air cavity (72). A three-way pipe (74) communicating with the interior of the air cavity (72) is fixedly connected to the bottom of the mold (71). One end of the three-way pipe (74) is fixedly connected to an air outlet pipe (75). The other end of the 74) is fixedly connected to an air inlet pipe (77). A dual-axis motor (79) is fixedly installed on the inner side of the support platform (1). The outlet end of the air outlet pipe (75) is provided with an air extraction component (70) that extracts air from the air chamber (72) by cooperating with the forward rotation of the output shaft of the dual-axis motor (79). The inlet end of the air inlet pipe (77) is provided with an air filling component (7a) that fills the air chamber (72) with air by cooperating with the reverse rotation of the output shaft of the dual-axis motor (79).

2. The negative pressure integrated vacuum forming machine according to claim 1, characterized in that, A first solenoid valve (76) is fixedly connected to the air outlet pipe (75), and a second solenoid valve (78) is fixedly connected to the air inlet pipe (77).

3. The negative pressure integrated vacuum forming machine according to claim 2, characterized in that, The mold (71) has an annular cavity (7b) on its inner side. The side wall of the annular cavity (7b) has several heat dissipation holes (7c) that communicate with the groove of the mold (71). The outer side of the mold (71) is fixedly connected to an air supply pipe (7d) that communicates with the inside of the annular cavity (7b). The inlet end of the air supply pipe (7d) is provided with a blower (7e) that blows air into the air supply pipe (7d) by cooperating with the activation of the air extraction component (70).

4. The negative pressure integrated vacuum forming machine according to claim 1, characterized in that, The lifting mechanism (4) includes two lugs (41) fixedly connected to both ends of the feeding frame (3). One end of the mounting frame (2) is fixedly connected to a vertically arranged guide rod (42). The other end of the mounting frame (2) is rotatably connected to a lead screw (43) arranged parallel to the guide rod (42). One lug (41) is slidably connected to the guide rod (42), and the other lug (41) is threadedly connected to the lead screw (43). A drive motor (44) is fixedly installed on the top of the mounting frame (2). The output shaft of the drive motor (44) is fixedly connected to the lead screw (43).

5. The negative pressure integrated vacuum forming machine according to claim 1, characterized in that, The positioning mechanism (5) includes two fixed seats (51) that are fixedly connected to the top ends of the feeding frame (3). A cylinder (52) is fixedly connected to the top of each of the two fixed seats (51). A mounting plate (53) is fixedly connected to the output end of each of the two cylinders (52). Elastic members (54) are provided at both ends of the mounting plate (53). A pressure plate (55) is fixedly connected to the bottom end of each of the two elastic members (54).

6. The negative pressure integrated vacuum forming machine according to claim 5, characterized in that, The elastic element (54) includes a slide rod (541) that passes through the mounting plate (53). A limit block (543) is fixedly connected to the top of the slide rod (541), and the bottom of the slide rod (541) is fixedly connected to the pressure plate (55). A spring (542) is sleeved on the slide rod (541), and the two ends of the spring (542) abut against the mounting plate (53) and the pressure plate (55) respectively.

7. The negative pressure integrated vacuum forming machine according to claim 3, characterized in that, The vacuum pump (70) includes a vacuum pump body (701) fixedly installed inside the support platform (1). The air inlet of the vacuum pump body (701) is connected to the outlet end of the air outlet pipe (75). A first ratchet (702) is fixedly connected to the end of the impeller shaft of the vacuum pump body (701). A first wheel (703) is fixedly connected to one output shaft of the dual-shaft motor (79). A plurality of first pawls (704) arranged in a ring are rotatably connected to the outer edge of the first wheel (703). The plurality of first pawls (704) are all engaged with the first ratchet (702).

8. The negative pressure integrated vacuum forming machine according to claim 7, characterized in that, The inflation component (7a) includes an air pump (7a1) fixedly installed inside the support platform (1). The air outlet of the air pump (7a1) is connected to the inlet end of the air inlet pipe (77). A second ratchet (7a2) is fixedly connected to the end of the impeller shaft of the air pump (7a1). A second wheel (7a3) is fixedly connected to the other output shaft of the dual-shaft motor (79). A plurality of second pawls (7a4) arranged in a ring are rotatably connected to the outer edge of the second wheel (7a3). The plurality of second pawls (7a4) are all engaged with the second ratchet (7a2).

9. A negative pressure integrated vacuum forming machine according to claim 8, characterized in that, The blower (7e) includes a blower body (7e1) fixedly installed inside the support platform (1). The air outlet of the blower body (7e1) is connected to the inlet end of the air supply pipe (7d). A first bevel gear (7e2) is fixedly connected to the end of the impeller shaft of the blower body (7e1). A second bevel gear (7e3) that meshes with the first bevel gear (7e2) is fixedly connected to the impeller shaft of the vacuum pump body (701).

10. A method of using the negative pressure integrated vacuum forming machine according to claim 3, characterized in that, Includes the following steps: S1: Place the plastic sheet inside the feeding frame (3), and then fix the plastic sheet stably inside the feeding frame (3) through the positioning mechanism (5); S2: Start the lifting mechanism (4) to drive the feeding frame (3) to move the plastic sheet upward, so that the feeding frame (3) moves to the heating area of ​​the infrared heater (6); S3: Start the infrared heater (6) to heat the plastic sheet inside the feeding frame (3) evenly, so that it softens to a state with good plasticity. The heating time and temperature can be precisely set according to the material and thickness. S4: After heating is completed, turn off the infrared heater (6) and start the lifting mechanism (4) to drive the feeding frame (3) to move downwards, so that the softened plastic sheet covers the mold (71). Then control the positioning mechanism (5) to release the plastic sheet, and at the same time start the output shaft of the dual-axis motor (79) to rotate in the forward direction, so that the air extraction component (70) extracts the air inside the air chamber (72) to form a negative pressure state, so that the air hole (73) tightly adheres the softened plastic sheet to the surface of the mold (71), perfectly replicating the contour and details of the mold; S5: When the exhaust component (70) is working, the blower (7e) blows cold air into the air supply pipe (7d), and then guides it into the annular cavity (7b) through the air supply pipe (7d). Then, it is evenly blown onto the upper surface of the plastic sheet in the mold (71) through each heat dissipation hole (7c), so that the plastic sheet can be cooled and shaped quickly. S6: After molding, start the output shaft of the dual-axis motor (79) to rotate in the opposite direction, so that the inflation component (7a) introduces air into the air inlet pipe (77), so that the air chamber (72) is filled with gas and the pressure increases, so that the air hole (73) applies an upward air thrust to the molded plastic sheet and separates from the mold (71), thus making the plastic sheet automatically demolded.

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