A method and device for hot pressing carbon fiber prepreg

Abstract

The present invention belongs to the technical field of carbon fiber production, and provides a hot pressing method and device for carbon fiber prepreg. The device includes a base, on which a lower mold is arranged. A plurality of groups of ball bearings are arranged on the surface of the lower mold close to the base. The base is fixedly installed with a top plate through a plurality of groups of guide columns. A first telescopic member pointing to the base is fixedly installed on the top plate. The output end of the first telescopic member is fixedly connected to a lifting plate slidably installed on the guide columns. An upper mold is fixedly installed on the lifting plate. Compared with the prior art, the beneficial effects of the present invention are as follows: Positioning and adjustment are carried out separately from the four side surfaces of the lower mold. The lower mold remains stationary under the action of four groups of thrust forces, realizing the precise positioning of the lower mold and the upper mold. It can be used for positioning lower molds of different sizes, improving the flexibility of equipment use. Moreover, when positioning the lower mold, the positioning reference is the upper mold, avoiding the situation that the upper mold and the lower mold cannot be aligned due to the movement of the upper mold.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon fiber production, and particularly relates to a hot pressing method and device for carbon fiber prepreg. Background Art

[0002] Carbon fiber compression molding is a widely used high-performance composite material molding process. This process uses carbon fiber as the reinforcing material. Through the pressure and temperature of the mold, after the resin and carbon fiber are fully mixed, they are pressed and formed in the mold. The carbon fiber compression molding process has the advantages of fast molding speed, high molding accuracy, and good product quality, and has been widely used in the fields of aviation, aerospace, automobiles, sports equipment, etc.

[0003] In the existing hot pressing device, the upper mold is directly driven by a hydraulic cylinder to press and close the mold. During the movement of the mold, the guide sleeve is worn due to the influence of friction, which will also cause the mold to be misaligned when closing the mold. It is difficult for the upper mold and the lower mold to be aligned up and down. This requires frequent inspection and adjustment of the mold, thereby affecting the forming efficiency of the carbon fiber prepreg. For the above technical problems, the Chinese patent with the patent publication number CN118514362A restricts the lower mold from the surrounding by the first clamping plate and the second clamping plate that move synchronously when in use. However, since the first clamping plate and the second clamping plate move simultaneously, if the lower mold is not square, after the first clamping plate or the second clamping plate contacts the lower mold, it will limit the movement of the other set of clamping plates. The lower mold will interfere with the movement of the first clamping plate or the second clamping plate, thereby making it impossible to accurately position the position of the lower mold in the other direction, reducing the positioning accuracy, and increasing the restriction of equipment use. Summary of the Invention

[0004] The purpose of the present invention is to provide a hot pressing method and device for carbon fiber prepreg, aiming to solve the technical problem that the position of the lower mold cannot be accurately positioned in the prior art, which increases the restriction of equipment use.

[0005] The present invention is implemented as follows. A hot pressing device for carbon fiber prepreg includes a base. A lower mold is arranged on the base. A plurality of groups of ball bearings are arranged on the surface of the lower mold close to the base. The base is fixedly installed with a top plate through a plurality of groups of guide columns. A first telescopic member pointing to the base is fixedly installed on the top plate. The output end of the first telescopic member is fixedly connected to a lifting plate slidably installed on the guide columns. An upper mold is fixedly installed on the lifting plate.

[0006] On the surface of the lifting plate close to the base, a plurality of first support plates are fixedly installed, which are distributed in a circumferential array around the axis of the first telescopic member. A second telescopic member is fixedly installed on the first support plate. The output end of the second telescopic member is fixedly installed with a second support plate. A first electromagnet is fixedly installed on the side of the second support plate away from the upper die. A third support plate is fixedly installed on the second support plate. A vertical plate is slidably installed on the third support plate. A first sliding plate and a second sliding plate are slidably installed on the vertical plate in parallel distribution. The first sliding plate and the second sliding plate move synchronously and in opposite directions. A fourth support plate is fixedly installed at one end of the first sliding plate close to the upper die. A permanent magnet is fixedly installed on the surface of the fourth support plate away from the vertical plate. An installation frame is fixedly installed at one end of the second sliding plate close to the upper die. A plurality of rollers are rotatably installed in the installation frame. A plurality of first through grooves for the vertical plate to pass through are formed on the lifting plate.

[0007] Further technical solution: A guiding plate is fixedly installed on the first support plate. The guiding plate is distributed along the length direction of the second telescopic member. The guiding plate is slidably connected with the second support plate.

[0008] Further technical solution: Grooves are formed on the surfaces of the first sliding plate and the second sliding plate close to each other, and racks are fixedly installed in the grooves. A gear is rotatably installed on the vertical plate. The gear is simultaneously engaged with the racks on the first sliding plate and the second sliding plate.

[0009] Further technical solution: A second elastic member is fixedly installed on the side of the vertical plate away from the upper die. One end of the second elastic member away from the vertical plate is fixedly connected with a tension sensor fixedly installed on the first sliding plate.

[0010] Further technical solution: An installation groove is formed on the base. A third telescopic member is fixedly installed in the installation groove. The output end of the third telescopic member is fixedly installed with a pressure sensor. A support plate is fixedly installed on the pressure sensor.

[0011] Further technical solution: A second through groove is formed at one end of the vertical plate close to the base. A guiding groove located in the second through groove is formed on the side wall of the vertical plate. A first substrate and a second substrate are slidably installed in the guiding groove. The first substrate and the second substrate are connected by a first elastic member. A fixing plate for cooperating with the second sliding plate is fixedly installed on the second substrate.

[0012] Further technical solution: Support bars are fixedly installed around the support plate. When the support bars move upward, they contact the first substrate and push the first substrate to move upward. A second electromagnet is fixedly installed at one end of the vertical plate close to the base. The base is made of a magnetic material, and the second electromagnet is energized to adsorb and fix with the base.

[0013] The present invention also provides a method for hot pressing carbon fiber prepreg, which is applied to the above-mentioned carbon fiber prepreg hot pressing device, and includes the following steps:

[0014] Step S1: Place the lower mold in the middle of the base, fixedly install the upper mold on the middle of the lower surface of the lifting plate, place the carbon fiber prepreg to be hot-pressed in the lower mold, and drive the second support plate to move towards the upper mold by the second telescopic member until the second support plate contacts the side surface of the upper mold;

[0015] Step S2: Drive the lifting plate to move downward by the first telescopic member until the vertical plate contacts the base, then energize the first electromagnet and make the lifting plate continue to descend while the vertical plate remains stationary. When the first electromagnet descends to the area where the permanent magnet is located, the first slide plate moves away from the upper mold under the repulsion of the magnetic force;

[0016] Step S3: When the first slide plate moves, it drives the second slide plate to move closer. The second slide plate drives the roller to move towards the lower mold until the roller contacts the lower mold. Then the roller can push the lower mold to move along the length direction of the second slide plate until the roller on the corresponding side also contacts the side surface of the lower mold. Finally, the rollers on the four groups of vertical plates respectively contact the four side edges of the lower mold and the lower mold remains stationary;

[0017] Step S4: The lifting plate continues to move downward to make the upper mold contact and seal with the lower mold, and then perform hot pressing. After the hot pressing is completed, the lifting plate resets, and the hot-pressed carbon fiber prepreg is taken out. Repeat the above steps to continue the hot pressing operation.

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

[0019] 1. During the descent of the upper mold, the magnetic force between the first electromagnet and the permanent magnet enables the roller to always apply a thrust force to the side edge of the lower mold, and the positioning adjustment is carried out separately from the four side surfaces of the lower mold. The lower mold remains stationary under the action of the four groups of thrust forces, realizing the precise positioning of the lower mold and the upper mold. It can be used for positioning lower molds of different sizes, improving the flexibility of equipment use. Moreover, when positioning the lower mold, the positioning reference is the upper mold, avoiding the misalignment of the upper mold and the lower mold caused by the movement of the upper mold, and further improving the positioning accuracy of the upper mold and the lower mold.

[0020] 2. It can detect whether the lower mold is accurately positioned according to the reading of the tension sensor. Subsequently, the current of the corresponding first electromagnet can be adjusted according to the reading of the tension sensor, thereby changing the magnetic force of the first electromagnet on the permanent magnet, so as to realize the further fine adjustment of the position of the lower mold. Finally, the current magnitudes of the first electromagnets on the same straight line are made the same, realizing the inspection of the positioning of the lower mold, ensuring the accurate positioning of the lower mold, and avoiding the problem that the roller cannot push the lower mold.

[0021] 3. After the lower mold is positioned and before the upper mold contacts the lower mold, the third telescopic member drives the support plate to move upward so that the support plate contacts and presses against the bottom of the lower mold. The pressure sensors detect the pressure exerted by the lower mold and the first elastic member on the support plate. When the pressure detected by the pressure sensors reaches the set value, the movement stops. At this time, the support plate exerts a supporting force on the lower mold and keeps the lower mold from leaving the base. The lower mold is fixed by the cooperation of its own gravity and the support plate, ensuring that the lower mold does not move after the positioning is completed and improving the accuracy of positioning.

[0022] 4. When the support plate moves upward, the support bar contacts the first substrate and drives the first substrate to move upward. The first substrate pushes the second substrate and the fixing plate upward through the first elastic member, causing the fixing plate to contact the second slide plate. By compressing the first elastic member, pressure is exerted on the second substrate, and further, the fixing plate exerts pressure on the second slide plate, making the second slide plate in a fixed state. At this time, the rollers around the lower mold are all in a fixed state, further restricting the lower mold and preventing it from moving, and further improving the accuracy of the lower mold positioning. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the structure of the lifting plate in the present invention.

[0025] Figure 3 It is a schematic cross-sectional view of the base in the present invention.

[0026] Figure 4 It is a schematic diagram of the structure of the lower mold in the present invention.

[0027] Figure 5 It is a schematic diagram of the structure of the second support plate in the present invention.

[0028] Figure 6 It is a schematic diagram of the structure of the vertical plate in the present invention.

[0029] Figure 7 is Figure 6 an enlarged schematic view of area A in

[0030] In the attached drawings: 1. Base; 2. Lower die; 3. Ball; 4. Guide post; 5. Top plate; 6. First telescopic member; 7. Lifting plate; 8. First through groove; 9. First support plate; 10. Second telescopic member; 11. Second support plate; 12. First electromagnet; 13. Guide plate; 14. Third support plate; 15. Vertical plate; 16. First sliding plate; 17. Fourth support plate; 18. Permanent magnet; 19. Second sliding plate; 20. Mounting bracket; 21. Roller; 22. Rack; 23. Gear; 24. Second through groove; 25. Guide groove; 26. First substrate; 27. First elastic member; 28. Second substrate; 29. Fixed plate; 30. Second electromagnet; 31. Second elastic member; 32. Tensile sensor; 33. Mounting groove; 34. Third telescopic member; 35. Pressure sensor; 36. Support plate; 37. Support bar; 38. Upper die. Detailed implementation manners

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the attached drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The following describes in detail the specific implementation of the present invention in conjunction with specific embodiments.

[0033] As Figures 1-7 shown, a carbon fiber prepreg hot pressing device provided by the present invention includes a base 1, a lower die 2 is arranged on the base 1, a plurality of groups of balls 3 are arranged on the surface of the lower die 2 close to the base 1, a top plate 5 is fixedly installed on the base 1 through a plurality of groups of guide posts 4, a first telescopic member 6 pointing to the base 1 is fixedly installed on the top plate 5, the output end of the first telescopic member 6 is fixedly connected to a lifting plate 7 slidably installed on the guide posts 4, and an upper die 38 is fixedly installed on the lifting plate 7;

[0034] On the surface of the lifting plate 7 close to the base 1, a plurality of first support plates 9 are fixedly installed, which are distributed in a circumferential array around the axis of the first telescopic member 6. A second telescopic member 10 is fixedly installed on the first support plate 9. The output end of the second telescopic member 10 is fixedly installed with a second support plate 11. A first electromagnet 12 is fixedly installed on the side surface of the second support plate 11 away from the upper die 38. A guide plate 13 is fixedly installed on the first support plate 9. The guide plate 13 is distributed along the length direction of the second telescopic member 10. The guide plate 13 is slidably connected with the second support plate 11. A third support plate 14 is fixedly installed on the second support plate 11. A vertical plate 15 is slidably installed on the third support plate 14. A first sliding plate 16 and a second sliding plate 19 which are parallelly distributed are slidably installed on the vertical plate 15. The first sliding plate 16 and the second sliding plate 19 move synchronously and in opposite directions. Grooves are formed on the surfaces of the first sliding plate 16 and the second sliding plate 19 close to each other, and racks 22 are fixedly installed in the grooves. A gear 23 is rotatably installed on the vertical plate 15. The gear 23 is simultaneously engaged with the racks 22 on the first sliding plate 16 and the second sliding plate 19. One end of the first sliding plate 16 close to the upper die 38 is fixedly installed with a fourth support plate 17. A permanent magnet 18 is fixedly installed on the surface of the fourth support plate 17 away from the vertical plate 15. One end of the second sliding plate 19 close to the upper die 38 is fixedly installed with a mounting frame 20. A plurality of rollers 21 are rotatably installed in the mounting frame 20. A plurality of first through grooves 8 for the vertical plate 15 to pass through are formed on the lifting plate 7.

[0035] In practical application of this embodiment, the lower die 2 is placed in the middle of the base 1, the upper die 38 is fixedly installed in the middle of the lower surface of the lifting plate 7, the carbon fiber prepreg to be hot-pressed is placed in the lower die 2, the second telescopic member 10 drives the second support plate 11 to move towards the upper die 38 until the second support plate 11 contacts the side surface of the upper die 38. At this time, the four second support plates 11 respectively contact the four side surfaces of the upper die 38. Then, the first telescopic member 6 drives the lifting plate 7 to move downward until the vertical plate 15 contacts the base 1. At this time, the lower die 2 is located within the four vertical plates 15. Then, the first electromagnet 12 is energized and the lifting plate 7 continues to descend while the vertical plate 15 remains stationary. At this time, the roller 21 is located within the height range of the side wall height distribution of the lower die 2. After the first electromagnet 12 is energized, the polarities of the surfaces approaching the permanent magnet 18 are the same. When the first electromagnet 12 descends to the area where the permanent magnet 18 is located, under the repulsive force of the magnetic force, the first sliding plate 16 moves in a direction away from the upper die 38. When the first sliding plate 16 moves, it drives the gear 23 to rotate. The gear 23 drives the second sliding plate 19 to move closer. The second sliding plate 19 drives the roller 21 to move closer to the lower die 2 until the roller 21 contacts the lower die 2. Then, the roller 21 can push the lower die 2 to move along the length direction of the second sliding plate 19 until the roller 21 on the corresponding side also contacts the side surface of the lower die 2, completing the position adjustment of the lower die 2 in one direction. The position adjustment of the lower die 2 in the other direction is the same. Since multiple second support plates 11 are symmetrically distributed close to the side surface of the upper die 38, finally, the rollers 21 on the four vertical plates 15 respectively contact the four side edges of the lower die 2 and the lower die 2 remains stationary. At this time, the lower die 2 is aligned with the upper die 38. By using the rollers 21, the friction with the lower die 2 is reduced, and by using the balls 3, the friction with the base 1 is reduced, enabling the lower die 2 to move smoothly and adjust its position. Then, the lifting plate 7 continues to move downward to make the upper die 38 contact and seal with the lower die 2, and then hot pressing can be carried out. During hot pressing, the first electromagnet 12 is powered off, and under the magnetic force of the permanent magnet 18, the roller 21 is separated from the lower die 2. After hot pressing is completed, the lifting plate 7 returns to its original position, and the hot-pressed carbon fiber prepreg is taken out. Then, repeating the above steps can continue the hot pressing operation. During the descent of the upper die 38, due to the magnetic force between the first electromagnet 12 and the permanent magnet 18, the roller 21 can always apply a thrust to the side edge of the lower die 2, and the positioning adjustment is carried out separately from the four side surfaces of the lower die 2. The lower die 2 remains stationary under the action of the four thrusts, realizing the precise positioning of the lower die 2 and the upper die 38, enabling the positioning and use of lower dies 2 of different sizes, improving the flexibility of equipment use, and when positioning the lower die 2, the positioning reference is the upper die 38, avoiding misalignment between the upper die 38 and the lower die 2 caused by the movement of the upper die 38, and further improving the positioning accuracy between the upper die 38 and the lower die 2.

[0036] In an example of this embodiment, the first telescopic member 6 and the second telescopic member 10 are respectively a first electric telescopic rod and a second electric telescopic rod. Of course, they can also be other components such as hydraulic cylinders that can actively change their lengths. The lifting plate 7 is driven to move up and down by the first electric telescopic rod.

[0037] As Figure 6 shown, a carbon fiber prepreg hot pressing device provided by the present invention. A second elastic member 31 is fixedly installed on the side of the vertical plate 15 away from the upper die 38. One end of the second elastic member 31 away from the vertical plate 15 is fixedly connected to a tension sensor 32 fixedly installed on the first sliding plate 16.

[0038] In the actual application of this embodiment, when the first electromagnet 12 is energized to push the first sliding plate 16 to move, the first sliding plate 16 drives the tension sensor 32 to move and stretch the second elastic member 31. After the subsequent positioning is completed, a reading will be displayed on the tension sensor 32. If the position of the lower die 2 is aligned with the position of the upper die 38, the readings of the two groups of tension sensors 32 on the same straight line will be the same and in a balanced state. Thus, it is possible to detect whether the lower die 2 is accurately positioned according to the reading of the tension sensor 32. Subsequently, the current magnitude of the corresponding first electromagnet 12 can be adjusted according to the reading magnitude of the tension sensor 32, thereby changing the magnitude of the magnetic force of the first electromagnet 12 on the permanent magnet 18, so as to realize further fine adjustment of the position of the lower die 2. Finally, the current magnitudes of the first electromagnets 12 on the same straight line are made the same, realizing the inspection of the positioning of the lower die 2, ensuring the accurate positioning of the lower die 2, and avoiding the problem that the roller 21 cannot push the lower die 2.

[0039] In an example of the present invention, the second elastic member 31 is a second spring. Of course, it can also be other elastic components such as elastic balls. A tension is applied to the tension sensor 32 by stretching the second spring.

[0040] As Figure 3 、 Figure 6 、 Figure 7 shown, a carbon fiber prepreg hot pressing device provided by the present invention. An installation groove 33 is opened on the base 1. A third telescopic member 34 is fixedly installed in the installation groove 33. The output end of the third telescopic member 34 is fixedly installed with a pressure sensor 35. A support plate 36 is fixedly installed on the pressure sensor 35.

[0041] Specifically, a second through groove 24 is opened at one end of the vertical plate 15 close to the base 1. A guide groove 25 located in the second through groove 24 is opened on the side wall of the vertical plate 15. A first substrate 26 and a second substrate 28 are slidably installed in the guide groove 25. The first substrate 26 and the second substrate 28 are connected by a first elastic member 27. A fixing plate 29 for cooperating with the second sliding plate 19 is fixedly installed on the second substrate 28.

[0042] Specifically, support bars 37 are fixedly installed on all four sides of the support plate 36. When the support bars 37 move upward, they contact the first substrate 26 and push the first substrate 26 to move upward. A second electromagnet 30 is fixedly installed on one end of the vertical plate 15 close to the base 1. The base 1 is made of magnetic material and the second electromagnet 30 is energized and adsorbed and fixed to the base 1.

[0043] In actual application of this embodiment, after the vertical plate 15 contacts the base 1, the second electromagnet 30 is energized and absorbs the base 1, so that the vertical plate 15 is in a fixed state. After the positioning of the lower mold 2 is completed, the upper mold 38 is located before the contact with the lower mold 2, and the third telescopic member 34 drives the support plate 36 to move upward so that the support plate 36 contacts and presses the bottom of the lower mold 2. The pressure sensor 35 detects the pressure of the lower mold 2 and the first elastic member 27 on the support plate 36. When the pressure detected by the pressure sensor 35 reaches the set value, it stops. At this time, the support plate 36 has a supporting force on the lower mold 2 and keeps the lower mold 2 from leaving the base 1. The lower mold 2 is fixed by the gravity of the lower mold 2 itself and the support plate 36. It is ensured that the lower mold 2 does not move after the positioning is completed, thereby improving the accuracy of positioning.

[0044] At the same time, when the support plate 36 moves upward, the support bar 37 contacts the first substrate 26 and drives the first substrate 26 to move upward. The first substrate 26 pushes the second substrate 28 and the fixed plate 29 to move upward through the first elastic member 27, so that the fixed plate 29 contacts the second slide plate 19, and the first elastic member 27 compresses the second substrate 28 to apply pressure, and then the fixed plate 29 applies pressure to the second slide plate 19, so that the second slide plate 19 is in a fixed state. At this time, the rollers 21 around the lower mold 2 are all in a fixed state, which further restricts the lower mold 2, prevents the lower mold 2 from moving, and further improves the accuracy of positioning the lower mold 2.

[0045] In one example of the present invention, the third telescopic member 34 is a third electric telescopic rod, and of course it can also be other components that can actively change the length, such as a hydraulic cylinder. The support plate 36 is driven up and down by the third electric telescopic rod. The first elastic member 27 is a first spring, and of course it can also be other elastic components such as an elastic ball. The first spring is compressed to apply pressure to the fixed plate 29.

[0046] like Figures 1-7 As shown, a carbon fiber prepreg hot pressing method provided by the present invention is applied to the carbon fiber prepreg hot pressing device described above, and comprises the following steps:

[0047] Step S1: placing the lower mold 2 in the middle of the base 1, fixing the upper mold 38 in the middle of the lower surface of the lifting plate 7, placing the carbon fiber prepreg to be hot-pressed in the lower mold 2, and the second telescopic member 10 drives the second support plate 11 to move toward the upper mold 38 until the second support plate 11 contacts the side of the upper mold 38;

[0048] Step S2: The first telescopic member 6 drives the lifting plate 7 to move downward until the vertical plate 15 contacts the base 1. Then, the first electromagnet 12 is energized and the lifting plate 7 continues to descend while the vertical plate 15 remains stationary. When the first electromagnet 12 descends to the area where the permanent magnet 18 is located, the first sliding plate 16 moves away from the upper die 38 under the repulsion of the magnetic force.

[0049] Step S3: When the first sliding plate 16 moves, it drives the second sliding plate 19 to move closer. The second sliding plate 19 drives the roller 21 to move closer to the lower die 2 until the roller 21 contacts the lower die 2. Then, the roller 21 can push the lower die 2 to move along the length direction of the second sliding plate 19 until the roller 21 on the corresponding side also contacts the side surface of the lower die 2. Finally, the rollers 21 on the four vertical plates 15 respectively contact the four side edges of the lower die 2 and the lower die 2 remains stationary.

[0050] Step S4: The lifting plate 7 continues to move downward to make the upper die 38 contact and seal with the lower die 2. Then, hot pressing is carried out. After the hot pressing is completed, the lifting plate 7 resets, and the carbon fiber prepreg after hot pressing is taken out. Repeat the above steps to continue the hot pressing operation.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0052] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hot pressing device for carbon fiber prepreg, comprising a base (1), characterized in that, A lower die (2) is arranged on the base (1), and a plurality of groups of balls (3) are arranged on the surface of the lower die (2) close to the base (1). A top plate (5) is fixedly installed on the base (1) through a plurality of groups of guide posts (4). A first telescopic member (6) pointing to the base (1) is fixedly installed on the top plate (5). The output end of the first telescopic member (6) is fixedly connected to a lifting plate (7) slidably installed on the guide posts (4). An upper die (38) is fixedly installed on the lifting plate (7). A plurality of groups of first support plates (9) arranged in a circumferential array around the axis of the first telescopic member (6) are fixedly installed on the surface of the lifting plate (7) close to the base (1). A second telescopic member (10) is fixedly installed on the first support plate (9). The output end of the second telescopic member (10) is fixedly installed with a second support plate (11). A first electromagnet (12) is fixedly installed on the side of the second support plate (11) away from the upper die (38). A third support plate (14) is fixedly installed on the second support plate (11). A vertical plate (15) is slidably installed on the third support plate (14). A first sliding plate (16) and a second sliding plate (19) are slidably installed on the vertical plate (15) in parallel distribution. The first sliding plate (16) and the second sliding plate (19) move synchronously and in opposite directions. A fourth support plate (17) is fixedly installed at one end of the first sliding plate (16) close to the upper die (38). A permanent magnet (18) is fixedly installed on the surface of the fourth support plate (17) away from the vertical plate (15). An installation frame (20) is fixedly installed at one end of the second sliding plate (19) close to the upper die (38). A plurality of groups of rollers (21) are rotatably installed in the installation frame (20). A plurality of groups of first through grooves (8) for the vertical plate (15) to pass through are formed on the lifting plate (7).

2. The hot pressing device for carbon fiber prepreg according to claim 1, wherein, A guide plate (13) is fixedly installed on the first support plate (9). The guide plate (13) is distributed along the length direction of the second telescopic member (10). The guide plate (13) is slidably connected to the second support plate (11).

3. A hot pressing device for carbon fiber prepreg according to claim 1, characterized in that, Grooves are formed on the surfaces of the first sliding plate (16) and the second sliding plate (19) close to each other, and racks (22) are fixedly installed in the grooves. A gear (23) is rotatably installed on the vertical plate (15). The gear (23) is simultaneously engaged with the racks (22) on the first sliding plate (16) and the second sliding plate (19).

4. A hot pressing device for carbon fiber prepreg according to claim 1, characterized in that, A second elastic member (31) is fixedly installed on the side of the vertical plate (15) away from the upper die (38). One end of the second elastic member (31) away from the vertical plate (15) is fixedly connected to a tension sensor (32) fixedly installed on the first sliding plate (16).

5. A carbon fiber prepreg hot pressing device according to claim 1, characterized in that, An installation groove (33) is formed on the base (1). A third telescopic member (34) is fixedly installed in the installation groove (33). The output end of the third telescopic member (34) is fixedly installed with a pressure sensor (35). A support plate (36) is fixedly installed on the pressure sensor (35).

6. The hot pressing device for carbon fiber prepreg according to claim 5, characterized in that, One end of the vertical plate (15) close to the base (1) is provided with a second through groove (24). A guide groove (25) is provided on the side wall of the vertical plate (15) and located within the second through groove (24). A first substrate (26) and a second substrate (28) are slidably mounted within the guide groove (25). The first substrate (26) and the second substrate (28) are connected by a first elastic member (27). A fixing plate (29) used in cooperation with the second sliding plate (19) is fixedly mounted on the second substrate (28).

7. A hot pressing device for carbon fiber prepreg according to claim 6, characterized in that, Supporting bars (37) are fixedly mounted around the supporting plate (36). When the supporting bars (37) move upward, they contact the first substrate (26) and push the first substrate (26) to move upward. A second electromagnet (30) is fixedly mounted at one end of the vertical plate (15) close to the base (1). The base (1) is made of a magnetic material and the second electromagnet (30) is energized to adsorb and fix to the base (1).

8. A hot pressing method for carbon fiber prepreg, characterized in that, Applied to a carbon fiber prepreg hot pressing device as described in any one of claims 1-7, it includes the following steps: Step S1: Place the lower mold (2) in the middle of the base (1). Fix the upper mold (38) to the middle of the lower surface of the lifting plate (7). Place the carbon fiber prepreg to be hot pressed in the lower mold (2). The second telescopic member (10) drives the second support plate (11) to move towards the upper mold (38) until the second support plate (11) contacts the side surface of the upper mold (38). Step S2: The first telescopic member (6) drives the lifting plate (7) to move downward until the vertical plate (15) contacts the base (1). Then, energize the first electromagnet (12) and continue to lower the lifting plate (7). The vertical plate (15) remains stationary. When the first electromagnet (12) descends to the area where the permanent magnet (18) is located, under the repulsion of the magnetic force, the first sliding plate (16) moves in a direction away from the upper mold (38). Step S3: When the first sliding plate (16) moves, it drives the second sliding plate (19) to move closer. The second sliding plate (19) drives the roller (21) to move towards the lower mold (2) until the roller (21) contacts the lower mold (2). Then, the roller (21) can push the lower mold (2) to move along the length direction of the second sliding plate (19) until the roller (21) on the corresponding side also contacts the side surface of the lower mold (2). Finally, the rollers (21) on the four groups of vertical plates (15) respectively contact the four side edges of the lower mold (2) and the lower mold (2) remains stationary. Step S4: The lifting plate (7) continues to move downward to make the upper mold (38) contact and seal with the lower mold (2). Then, perform hot pressing. After the hot pressing is completed, the lifting plate (7) resets. Take out the hot pressed carbon fiber prepreg and repeat the above steps to continue the hot pressing operation.

Images