A vacuum forming apparatus for a resin film composite

Abstract

The present application relates to a kind of resin film composite vacuum forming equipment applied to film vacuum forming field, by the setting of secondary regulating unit, the change of gas flow rate at multiple air extraction holes can be monitored in real time, and the inner diameter of pipeline can be adjusted to adjust gas flow rate, in turn, the flow rate at multiple air extraction holes tends to be consistent, compared with prior art, effectively improve the uniformity of composite material in vacuum forming process, not prone to unplanned local over-thickness or over-thin situation, simultaneously with the setting of fluctuation sensing unit, after the pipe diameter adjustment of two-face pipe, in the air extraction process, the vibration condition at each place of two-face pipe can be sensed in real time, in turn, the excessive fluctuation of two-face pipe can be detected in time, so that staff can intervene in time, further improve the forming quality of composite material.

Description

Technical Field

[0001] This invention relates to a vacuum forming apparatus, and more particularly to a vacuum forming apparatus for a resin film composite material applied in the field of film vacuum forming. Background Technology

[0002] Currently, the mainstream processes in the field of composite materials include: autoclave molding, PCM prepreg molding, WCM wet molding, and HP-RTM molding. The raw materials used in these processes are mostly prepregs, which themselves require frozen storage. Due to the wide variety of products and the different prepregs required for each product, the sheer number of materials leads to increased material management costs, occupies significant cold storage space, and results in high energy consumption.

[0003] In the cost structure of prepregs, fiber cloth accounts for the majority. When there are many types of materials, the problem of material obsolescence and expiration is inevitable, especially for imported prepregs. This situation is particularly serious, and obsolescence and expiration can lead to significant cost losses. Furthermore, since the mold cavity space is fixed and the thickness of a single layer of prepreg is fixed, the thickness of the part can only be adjusted according to a multiple of the thickness of a single layer of prepreg, with limited adjustment space. Often, adding too much material results in an excessively thick product wall, while removing a layer makes the part difficult to compact, leading to severe pinholes and high porosity. At the same time, it is also easy for resin penetration to be incomplete. If resin penetration backflow occurs, it may locally cover the area, forming dry spots, and in severe cases, it may even lead to mold scrapping.

[0004] Therefore, the molding of the above-mentioned prepreg composite material has significant drawbacks. To address these issues, a non-prepreg composite material molding method is proposed. This method involves stacking a resin film and a limiting cloth layer on a mold, covering it with a vacuum film, applying suction to create a vacuum compression stack, and simultaneously heating to cure the resin. For example, the method and apparatus for forming a composite stack using a breathable polyethylene vacuum film disclosed in Chinese Patent Specification No. CN106132673A are examples of such methods.

[0005] However, in the vacuum forming process, there are usually more than one vacuum hole, often multiple ones. For example, the vacuum forming device and method disclosed in Chinese Patent Specification No. CN119217622A, where the vacuuming of multiple air holes is controlled by the same air pump, the vacuuming speed of multiple air holes will vary when the tube length, angle, etc. are different. This often leads to uneven local forming and affects the quality of the finished composite material. Summary of the Invention

[0006] The technical problem to be solved by the present invention in view of the above-mentioned prior art is that the pumping rate at multiple pumping holes is inconsistent during vacuum molding, which will affect the quality of the finished composite material.

[0007] To address the aforementioned problems, this invention provides a vacuum forming device for resin film composite materials, comprising a device body, a lower mold fixedly embedded inside the upper end of the device body, the opening of the lower mold being flush with the upper surface of the device body, an inner groove being chiseled at the upper end of the lower mold, two symmetrical slide rails fixedly connected to the upper end of the device body about the lower mold, and the slide rails extending horizontally into the device body, a movable module being connected to both slide rails, the effective sliding stroke of the movable module being not less than twice that of the lower mold, an upper mold being slidably installed inside the movable module, and multiple electric cylinders being fixedly installed at the upper end of the movable module, the extended ends of the multiple electric cylinders being movablely penetrating the movable module and fixedly connected to the upper mold, and the upper mold and the lower mold being matched with each other;

[0008] An air pump is installed at the bottom of the equipment body. Multiple air extraction holes are drilled at the lower end of the lower mold. An air tube bundle is connected between the air pump inlet and the multiple air extraction holes. The air tube bundle includes a main air extraction pipe, a homogenizing hollow plate, and multiple air extraction branch pipes that are respectively connected to the openings of the multiple air extraction holes. The main air extraction pipe and the multiple air extraction branch pipes are fixed and connected to the lower and upper ends of the homogenizing hollow plate, respectively. The end of the main air extraction pipe is connected to the air pump inlet. A secondary adjustment unit is provided at the end of the multiple air extraction branch pipes near the air extraction holes. The secondary adjustment unit includes a gas flow rate sensor installed at the lower end of the lower mold, two tubes fixed in series on the air extraction branch pipes, and a diameter adjustment component fixedly sleeved outside the two tubes. The diameter adjustment component completely covers the two tubes, and the upper and lower ends of the diameter adjustment component are fixedly connected to the air extraction branch pipes. The detection end of the gas flow rate sensor extends to the air extraction branch pipe.

[0009] In the vacuum forming equipment for the above-mentioned resin film composite material, the gas flow rate changes at multiple extraction holes can be monitored in real time by setting a secondary adjustment unit, and the inner diameter of the pipe can be adjusted to adjust the gas flow rate, thereby making the flow rate at multiple extraction holes more consistent. Compared with the existing technology, this effectively improves the uniformity of the composite material in the vacuum forming process and makes it less likely for unplanned local over-thickness or under-thinness to occur.

[0010] As a further improvement of this application, a rectangular sealing ring is fixedly connected to the bottom of the lower mold, the length and width of the upper mold are larger than the length and width of the rectangular sealing ring, and multiple air extraction holes are located inside the rectangular sealing ring.

[0011] As a further improvement of this application, a rectangular pressure frame is rotatably connected to the upper end of the equipment body near the step transition point. A sealing ring is fixedly connected to the end of the rectangular pressure frame facing the inner groove. The sealing ring matches the inner groove. Two L-shaped limiting blocks are rotatably connected to the upper end of the equipment body away from the step. The L-shaped limiting blocks match the rectangular pressure frame.

[0012] As a further improvement of this application, the diameter adjustment assembly includes an outer casing, two semicircular plates fixedly embedded at the upper and lower ends of the outer casing, a plurality of radial rods located between the two semicircular plates, and a diameter-changing unit disposed between the plurality of radial rods and the two-sided tube. The diameter-changing unit corresponds to the two-sided tube. Multiple pairs of electric slide rails are installed at the ends of the two semicircular plates that are close to each other, and the plurality of radial rods are respectively matched with the plurality of pairs of electric slide rails.

[0013] As a further improvement of this application, the two-sided pipe includes a diameter-changing valve and an air passage valve fixed to the air extraction branch pipe. The ends of the diameter-changing valve and the air passage valve that are close to each other are fixed and sealed to each other, and the diameter-changing unit is directly opposite the diameter-changing valve. The air passage valve is a rigid structure, and the diameter-changing valve is an elastic structure.

[0014] As a further improvement of this application, the variable diameter unit includes multiple bundle tubes fixedly embedded in the outer end of the variable diameter flap, multiple bundle tube strips fixedly connected to the outside of the multiple bundle tubes, and multiple connecting tubes connected between the bundle tube strips and the radial movement rod.

[0015] As a further improvement of this application, the bundle tube strip is an elastic semi-ring structure, and the two ends of the bundle tube strip bypass the diameter-changing valve and are fixedly connected to the air-passing valve. All bundle surface tubes are rigid structures.

[0016] As a further improvement of this application, an electromagnetic plate is fixedly embedded inside the air valve, the valve is modified into a double-layer structure, and the interlayer of the double-layer valve is saturated with magnetorheological fluid.

[0017] As another improvement of this application, the bundled tube is a hollow structure, and at least three bundled tubes are provided with wave sensing units. The wave sensing unit includes a tension sensor fixedly connected to the center of the inside of the bundled tube and two sensing ropes fixedly connected to the two ends of the tension sensor and the corresponding semicircular plates.

[0018] As a further improvement to this application, the sensing rope is an elastic structure and is always taut.

[0019] In summary, by setting up a secondary adjustment unit, the changes in gas flow rate at multiple extraction holes can be monitored in real time, and the inner diameter of the pipe can be adjusted to regulate the gas flow rate, thereby making the flow rate at multiple extraction holes more consistent. Compared with existing technologies, this effectively improves the uniformity of composite materials during vacuum forming, making it less likely for unplanned local over-thickness or under-thinness to occur. At the same time, with the addition of a fluctuation sensing unit, after the pipe diameters of the two tubes are adjusted, the vibration of each part of the two tubes can be sensed in real time during the extraction process, making it easier to detect excessive fluctuations in the two tubes in a timely manner. This allows for timely intervention by staff, further improving the forming quality of composite materials. Attached Figure Description

[0020] Figure 1This is a perspective view of the first embodiment of this application;

[0021] Figure 2 This is a schematic diagram illustrating the process of using the first embodiment of this application;

[0022] Figure 3 This is a perspective view of the first embodiment of this application from a bottom angle;

[0023] Figure 4 This is a diagram showing the changes of the heating module in the first embodiment of this application before and after mold closing;

[0024] Figure 5 This is a perspective view of the bottom portion of the lower mold according to the first embodiment of this application;

[0025] Figure 6 This is a schematic diagram of the first embodiment of this application during mold closing;

[0026] Figure 7 This is a perspective view of the diameter adjustment assembly according to the first embodiment of this application;

[0027] Figure 8 This is a perspective view of the diameter adjustment component portion according to the first embodiment of this application;

[0028] Figure 9 This is a schematic diagram of the diameter adjustment component according to the first embodiment of this application during diameter reduction;

[0029] Figure 10 This is a schematic diagram of the diameter adjustment component according to the first embodiment of this application during diameter expansion;

[0030] Figure 11 This is a schematic diagram of the double-sided tube in the first embodiment of this application when its diameter is expanded or reduced.

[0031] Figure 12 This is a cross-sectional schematic diagram of the wave sensing unit according to the second embodiment of this application.

[0032] Explanation of the labels in the diagram:

[0033] 1 Equipment body, 2 Lower mold, 201 Rectangular sealing ring, 3 Heating module, 31 Upper mold, 32 Electric cylinder, 301 Slide rail, 4 Rectangular pressure frame, 401 L-shaped limit block, 5 Air pump, 51 Main extraction pipe, 52 Homogenizing hollow plate, 53 Extraction branch pipe, 6 Diameter adjustment assembly, 601 Electric slide rail, 602 Gas flow rate sensor, 61 Outer casing, 62 Semicircular plate, 63 Radial rod, 501 Air valve, 502 Diameter adjustment valve, 71 Bundle surface tube, 72 Bundle tube strip, 73 Connecting pipe, 701 Tension sensor, 702 Sensing rope. Detailed Implementation

[0034] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0035] First implementation method:

[0036] Figure 1 The diagram illustrates a vacuum forming apparatus for resin film composite materials, comprising an apparatus body 1, wherein the apparatus body 1 is L-shaped and stepped. A lower mold 2 is fixedly embedded inside the upper end of the apparatus body 1, the opening of the lower mold 2 being flush with the upper surface of the apparatus body 1. An inner groove is chiseled at the upper opening of the lower mold 2. Two slide rails 301 symmetrical about the lower mold 2 are fixedly connected to the upper end of the apparatus body 1, and the slide rails 301 extend horizontally into the apparatus body 1. A moving module 3 is connected to both slide rails 301. The effective sliding stroke of the moving module 3 is not less than twice that of the lower mold 2. An upper mold 31 is slidably installed inside the moving module 3. Multiple electric cylinders 32 are fixedly installed on the upper end of the moving module 3, and the extended ends of the multiple electric cylinders 32 movably penetrate the moving module 3 and are fixedly connected to the upper mold 31. The upper mold 31 and the lower mold 2 are matched with each other. Figure 2 In the diagram, 'a' represents the stacked resin film and fiber cloth, allowing the moving module 3 to move laterally along the slide rail 301. When laying the fiber cloth and resin film, the moving module 3 can be moved into the equipment body 1, thus completely misaligning with the lower mold 2. Then, the resin film and fiber cloth are cut according to the dimensions of the inner groove and laid crosswise. After laying, the rectangular pressure frame 4 is rotated to press down on the fiber cloth and resin film and limit their movement. Then, the moving module 3 is pulled to directly above the lower mold 2. Figure 4 The upper mold 31 is controlled to move down and close with the lower mold 2. Then the resin film is heated and a vacuum operation is performed to achieve the molding of the composite material.

[0037] A rectangular pressure frame 4 is rotatably connected to the upper end of the equipment body 1 near the step transition. A sealing ring is fixedly connected to the end of the rectangular pressure frame 4 facing the inner groove. The sealing ring matches the inner groove. Two L-shaped limiting blocks 401 are rotatably connected to the upper end of the equipment body 1 away from the step. The L-shaped limiting blocks 401 match the rectangular pressure frame 4. After the resin film and fiber cloth are laid, the rectangular pressure frame 4 limits the two. The L-shaped limiting blocks 401 can be rotated to press against the upper end of the rectangular pressure frame 4, thereby achieving the positioning of the rectangular pressure frame 4 and thus limiting the resin film and fiber cloth below it.

[0038] A rectangular sealing ring 201 is fixedly connected to the bottom inner end of the lower mold 2. The length and width dimensions of the upper mold 31 are larger than the length and width dimensions of the rectangular sealing ring 201, and multiple air extraction holes are located inside the rectangular sealing ring 201. Figure 6 When the mold is closed, the bottom of the upper mold 31 can be pressed against the rectangular sealing ring 201, thereby effectively maintaining the seal of the vacuum cavity and facilitating the molding of composite materials.

[0039] like Figure 3and Figure 5 The bottom of the equipment body 1 is also equipped with an air pump 5. The lower end of the lower mold 2 has multiple air extraction holes. The air pump 5 is connected to the multiple air extraction holes by an air tube bundle. The air tube bundle includes an air extraction main pipe 51, a homogenizing hollow plate 52, and multiple air extraction branch pipes 53 that are respectively connected to the openings of the multiple air extraction holes. The air extraction main pipe 51 and the multiple air extraction branch pipes 53 are respectively fixed to and connected to the lower end and the upper end of the homogenizing hollow plate 52. The end of the air extraction main pipe 51 is connected to the air inlet of the air pump 5.

[0040] like Figure 6-7 Each of the multiple extraction branch pipes 53 near the extraction port is equipped with a secondary adjustment unit. The secondary adjustment unit includes a gas flow rate sensor 602 installed at the lower end of the lower mold 2, two tubes fixed in series on the extraction branch pipes 53, and a diameter adjustment component 6 fixedly sleeved on the two tubes. The diameter adjustment component 6 completely covers the two tubes, and the upper and lower ends of the diameter adjustment component 6 are fixedly connected to the extraction branch pipes 53. The detection end of the gas flow rate sensor 602 extends to the extraction branch pipes 53. Through the setting of the secondary adjustment unit, the gas flow rate changes at multiple extraction ports can be monitored in real time, and the inner diameter of the pipe can be adjusted to adjust the gas flow rate, thereby making the flow rate at multiple extraction ports tend to be consistent. Compared with the prior art, this effectively improves the uniformity of the composite material in the vacuum forming process and makes it less likely for unplanned local over-thickness or under-thinness to occur.

[0041] like Figure 7-8 The diameter adjustment assembly 6 includes an outer casing 61, two semicircular plates 62 fixedly embedded at the upper and lower ends of the outer casing 61, multiple radial rods 63 located between the two semicircular plates 62, and a diameter-changing unit disposed between the multiple radial rods 63 and the two-sided tube. The diameter-changing unit corresponds to the two-sided tube. Multiple pairs of electric slide rails 601 are installed at the ends of the two semicircular plates 62 that are close to each other. The multiple radial rods 63 are respectively matched with the multiple pairs of electric slide rails 601, such as... Figure 8 The variable diameter unit includes multiple bundle tubes 71 fixedly embedded in the outer end of the diameter-changing valve 502, multiple bundle tube strips 72 fixedly connected to the outside of the multiple bundle tubes 71, and multiple connecting tubes 73 connected between the bundle tube strips 72 and the radial rod 63. The bundle tube strips 72 are elastic semi-ring structures, and both ends of the bundle tube strips 72 bypass the diameter-changing valve 502 and are fixedly connected to the air valve 501. The multiple bundle tubes 71 are all rigid structures.

[0042] The double-sided pipe includes a reducing valve 502 and an air passage valve 501 fixed to the extraction branch pipe 53. The ends of the reducing valve 502 and the air passage valve 501 that are close to each other are fixed and sealed. The reducing unit faces the reducing valve 502. The air passage valve 501 is a rigid structure, while the reducing valve 502 is an elastic structure. Figure 11The variable diameter unit can control the compression or stretching of the elastic diameter-changing flap 502, thereby achieving the expansion or contraction of the overall diameter of the two-sided tube, thus adapting to the differences in air extraction speed at multiple air extraction ports. Specifically, for example... Figure 9 During the diameter reduction process, the radial actuator 63 can be controlled to move along the electric slide rail 601 toward the axis of the extraction branch pipe 53, thereby pushing multiple bundled surface pipes 71 to move toward the axis, causing the diameter reduction flaps 502 to simultaneously shrink toward the axis, thus achieving the diameter reduction effect. Figure 10 During the expansion process, the control rod 63 moves in the opposite direction, causing the bundle tube 72 to move away from the axis along with multiple bundle surface tubes 71. The diameter-changing valve 502 deforms accordingly, thereby achieving the effect of diameter expansion.

[0043] It is worth noting that during the change of diameter, multiple radial rods 63 can be controlled to move synchronously at the same time, or only one radial rod 63 can be controlled to move. The specific operation mode can be selected according to actual needs.

[0044] An electromagnetic plate is fixedly embedded inside the air valve 501. The diameter-changing valve 502 has a double-layer structure, and the interlayer of the double-layer diameter-changing valve 502 is saturated with magnetorheological fluid. After diameter adjustment, the electromagnetic plate can be energized to harden the corresponding magnetorheological fluid, thus making the shape of the diameter-changing valve 502 stable and less prone to excessive fluctuations during air extraction. This effectively maintains the consistency of the air extraction speed at multiple air extraction holes and effectively ensures the quality of the finished product.

[0045] In summary, by setting up a secondary adjustment unit, the changes in gas flow rate at multiple extraction holes can be monitored in real time, and the inner diameter of the pipe can be adjusted to regulate the gas flow rate, thereby making the flow rate at multiple extraction holes more consistent. Compared with existing technologies, this effectively improves the uniformity of composite materials during vacuum forming, making it less likely for unplanned local over-thickness or under-thinness to occur. At the same time, with the addition of a fluctuation sensing unit, after the pipe diameters of the two tubes are adjusted, the vibration of each part of the two tubes can be sensed in real time during the extraction process, making it easier to detect excessive fluctuations in the two tubes in a timely manner. This allows for timely intervention by staff, further improving the forming quality of composite materials.

[0046] Second implementation method:

[0047] This embodiment adds a wave sensing unit to the first embodiment, while the rest remains the same as the first embodiment.

[0048] Figure 12As shown, the beam tube 71 has a hollow structure, and at least three beam tubes 71 are equipped with wave sensing units. The wave sensing unit includes a tension sensor 701 fixedly connected to the center of the beam tube 71 and two sensing ropes 702 respectively fixedly connected to the two ends of the tension sensor 701 and the corresponding semicircular plate 62. The sensing ropes 702 are elastic structures and are always taut, effectively ensuring that the sensing ropes 702 are stretched when the valve 502 fluctuates, thereby causing the tension sensor 701 to generate force data. The greater the fluctuation, the greater the tensile force and the larger the data. Based on this, although the valve 502 hardens during the evacuation process, it is not completely rigid, that is, its hardness is relatively low. If the gas fluctuation is large, it will also undergo a certain deformation, causing the tension sensor 701 to change data. Based on this, the stability during evacuation can be effectively monitored, making it easy to detect unstable factors in time and carry out maintenance, so as to reduce the impact on the quality of the composite material product.

[0049] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A vacuum forming device for resin film composite materials, characterized in that: The device includes a main body (1), a lower mold (2) is fixedly embedded inside the upper end of the main body (1), the opening of the lower mold (2) is flush with the upper surface of the main body (1), the upper end of the lower mold (2) has an inner groove, the upper end of the main body (1) is fixedly connected to two slide rails (301) symmetrical about the lower mold (2), and the slide rails (301) extend horizontally into the main body (1), the two slide rails (301) are connected to a moving module (3), the effective sliding stroke of the moving module (3) is not less than twice that of the lower mold (2), the upper mold (31) is slidably installed inside the moving module (3), and multiple electric cylinders (32) are fixedly installed on the upper end of the moving module (3), the extended ends of the multiple electric cylinders (32) move through the moving module (3) and are fixedly connected to the upper mold (31), and the upper mold (31) and the lower mold (2) are matched with each other; An air pump (5) is also installed at the bottom of the equipment body (1). Multiple air extraction holes are drilled at the lower end of the lower mold (2). An air tube bundle is connected between the air inlet end of the air pump (5) and the multiple air extraction holes. The air tube bundle includes a main air extraction pipe (51), a homogenizing hollow plate (52), and multiple air extraction branch pipes (53) that are respectively connected to the openings of the multiple air extraction holes. The main air extraction pipe (51) and the multiple air extraction branch pipes (53) are fixed and connected to the lower end and the upper end of the homogenizing hollow plate (52), respectively. The end of the main air extraction pipe (51) is connected to the air inlet of the air pump (5). The multiple exhaust branch pipes (53) are connected to the exhaust port and are equipped with a secondary adjustment unit at the end near the exhaust port. The secondary adjustment unit includes a gas flow rate sensor (602) installed at the lower end of the lower mold (2), a two-sided pipe fixed in series on the exhaust branch pipe (53), and a diameter adjustment component (6) fixedly sleeved on the two-sided pipe. The diameter adjustment component (6) completely covers the two-sided pipe, and the upper and lower ends of the diameter adjustment component (6) are fixedly connected to the exhaust branch pipe (53). The detection end of the gas flow rate sensor (602) extends to the exhaust branch pipe (53). The diameter adjustment assembly (6) includes an outer shell (61), two semicircular plates (62) fixedly embedded at the upper and lower ends of the outer shell (61), a plurality of radial rods (63) located between the two semicircular plates (62), and a diameter-changing unit disposed between the plurality of radial rods (63) and the two-sided tube. The diameter-changing unit corresponds to the two-sided tube. A plurality of electric slide rails (601) are installed at the ends of the two semicircular plates (62) that are close to each other. The plurality of radial rods (63) are respectively matched with the plurality of electric slide rails (601). The two-sided pipe includes a diameter-changing valve (502) and an air passage valve (501) fixed to the air extraction branch pipe (53). The diameter-changing valve (502) and the air passage valve (501) are fixed and sealed to each other at their close ends, and the diameter-changing unit is directly opposite the diameter-changing valve (502). The air passage valve (501) is a rigid structure, and the diameter-changing valve (502) is an elastic structure. The variable diameter unit includes multiple bundle tubes (71) fixedly embedded in the outer end of the variable diameter flap (502), multiple bundle tube strips (72) fixedly connected to the outside of the multiple bundle tubes (71), and multiple connecting tubes (73) connected between the bundle tube strips (72) and the radial rod (63).

2. The vacuum forming equipment for resin film composite materials according to claim 1, characterized in that: A rectangular sealing ring (201) is fixedly connected to the bottom of the lower mold (2). The length and width of the upper mold (31) are larger than the length and width of the rectangular sealing ring (201), and multiple air extraction holes are located inside the rectangular sealing ring (201).

3. The vacuum forming equipment for resin film composite materials according to claim 1, characterized in that: A rectangular pressure frame (4) is rotatably connected to the upper end of the device body (1) near the step turning point. A sealing ring is fixedly connected to the end of the rectangular pressure frame (4) facing the inner groove. The sealing ring matches the inner groove. Two L-shaped limiting blocks (401) are rotatably connected to the upper end of the device body (1) away from the step. The L-shaped limiting blocks (401) match the rectangular pressure frame (4).

4. The vacuum forming equipment for resin film composite materials according to claim 1, characterized in that: The bundle tube strip (72) is an elastic semi-ring structure, and the two ends of the bundle tube strip (72) bypass the diameter-changing valve (502) and are fixedly connected to the air valve (501). All of the bundle surface tubes (71) are rigid structures.

5. The vacuum forming equipment for resin film composite materials according to claim 4, characterized in that: The air passage valve (501) is internally embedded with an electromagnetic plate, and the re-diameter valve (502) has a double-layer structure, with the interlayer of the double-layer re-diameter valve (502) saturated with magnetorheological fluid.

6. The vacuum forming equipment for resin film composite materials according to claim 5, characterized in that: The bundle tube (71) is a hollow structure, and at least three of the bundle tubes (71) are provided with wave sensing units. The wave sensing unit includes a tension sensor (701) fixedly connected to the center inside the bundle tube (71) and two sensing ropes (702) fixedly connected to the two ends of the tension sensor (701) and the corresponding semicircular plate (62).

7. The vacuum forming equipment for resin film composite materials according to claim 6, characterized in that: The sensing rope (702) is an elastic structure and is always taut.

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