Molding apparatus for producing a laminate based on a thermoplastic resin and a molding method thereof

Abstract

The application relates to the technical field of plastic forming processing, in particular to a mold pressing forming device for producing laminated boards based on thermoplastic resin and a forming method thereof. The mold pressing forming device for producing laminated boards based on thermoplastic resin comprises a support and a support frame arranged on the support, further comprises: a pressing plate which is slidably arranged on the support frame and can be driven to ascend and descend by a first hydraulic cylinder arranged on the support frame, a through hole is arranged on the pressing plate along the length direction of the support, and a cross arm is slidably arranged in the through hole; an upper mold and a lower mold, the upper mold is connected with the cross arm through a plurality of elastic structures, and the lower mold is movably arranged on the support frame; and the cooperative movement generated by a first reciprocating mechanism and a second reciprocating mechanism can make the molten material receive dynamic forces in a three-dimensional space, helps the material to be more evenly distributed in the mold, makes the material better fill each part of the mold, significantly improves the filling effect, and reduces the generation of pores and defects.

Description

Technical Field

[0001] This invention relates to the field of plastic molding and processing technology, specifically to a molding apparatus and molding method for producing laminates based on thermoplastic resin. Background Technology

[0002] Thermoplastic resins are a class of plastic materials that soften when heated and solidify when cooled, possessing excellent plasticity, mechanical properties, and chemical resistance. In industrial applications, thermoplastic resins, along with other fibrous fabrics, are commonly used in compression molding to produce laminates. Compression molding involves melting materials within a mold, applying pressure, and allowing the molten material to solidify to form a laminate, meeting the demands of industries such as aerospace, automotive, and electronics for high-performance composite materials.

[0003] Different products require different mold shapes. For example, some products require the presence of fine grooves, protrusions, text, or patterns in the mold to achieve the desired appearance of the molded laminate.

[0004] However, in existing compression molding machines, the mold remains stationary after closing. The flow and filling of the melted material within the mold relies solely on the pressure applied by the upper mold. For materials with poor flowability or high viscosity, it is difficult to quickly and fully fill some of the smaller grooves in the mold, resulting in insufficient filling of the material within the mold. Poor molding effect can easily lead to product defects. Moreover, although existing molds are equipped with venting channels, it is difficult for the air inside the material to be directly discharged, which may lead to defects such as pores and bubbles in the finished product. Summary of the Invention

[0005] The purpose of this invention is to provide a molding apparatus and molding method for producing laminates based on thermoplastic resin, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A molding apparatus for producing laminates based on thermoplastic resin includes a support and a bracket mounted on the support, and further includes:

[0008] The pressure plate is slidably mounted on the support and can be driven to rise and fall by the first hydraulic cylinder mounted on the support. The pressure plate has a guide port along the length of the support, and a cross arm is slidably mounted in the guide port.

[0009] The upper mold and the lower mold are connected to the cross arm through multiple sets of elastic structures. The lower mold is movably mounted on the support. When the upper mold and the lower mold are closed, the cross arm can be driven by the first reciprocating mechanism mounted on the support to drive the upper mold and the lower mold to reciprocate along the length direction of the support. The support arm mounted on the side of the upper mold can be driven by the second reciprocating mechanism mounted on the support to make the upper mold and the lower mold move relative to each other in the vertical direction.

[0010] The positioning mechanism, located on the pressure plate, can cause the upper mold to move relative to the pressure plate and cooperate with the horizontal arm.

[0011] As a further embodiment of the present invention: the elastic structure includes a column fixed to the support arm and a spring sleeved on the outer periphery of the column, the column being slidably connected to the cross arm, and the two ends of the spring being respectively connected to the support arm and the cross arm;

[0012] The second reciprocating mechanism includes a vertical shaft rotatably mounted on the support and a drive motor mounted on the support with its output end connected to the vertical shaft. The vertical shaft is connected to the first reciprocating mechanism and is also connected to the support arm through a drive assembly. The drive assembly can cause the spring to reciprocate by compressing and rebounding.

[0013] As a further embodiment of the present invention: the drive assembly includes an assembly plate fixed to the pressure plate and a sleeve rotatably mounted on the assembly plate and slidably fitted with the vertical shaft, the sleeve being connected to the support arm through an intermittent fit structure;

[0014] The outer wall of the vertical shaft has a strip-shaped protrusion, and the inner wall of the sleeve has a strip-shaped groove. The strip-shaped groove is adapted to the strip-shaped protrusion, and both are parallel to the central axis of the vertical shaft and the sleeve.

[0015] As a further embodiment of the present invention: the intermittent fit structure includes an incomplete gear rotatably mounted on the assembly plate and a toothed plate that fits with the toothed portion of the incomplete gear. The toothed plate is arranged in an "L" shape and is slidably connected to the support arm through a guide groove provided at the end of the support arm.

[0016] The rotating shaft of the incomplete gear is connected to the sleeve through a transmission component. A guide block is provided on the side of the assembly plate. A groove adapted to the guide block is provided on the side of the toothed plate facing the guide block. The guide block is slidably fitted into the groove.

[0017] As a further embodiment of the present invention: the first reciprocating mechanism includes a drive disk rotatably mounted on the support and a connecting rod hinged to the eccentric part of the drive disk. The end of the connecting rod away from the drive disk is hinged to the side of the lower mold, and the rotation shaft of the drive disk is connected to the vertical shaft through a chain.

[0018] As a further embodiment of the present invention: the positioning mechanism includes two drive arms movably mounted on the support and capable of sliding along the length direction of the support, and two second hydraulic cylinders are also hinged to the side of the support, with the movable ends of the two second hydraulic cylinders respectively hinged to the two drive arms.

[0019] It also includes a sliding engagement assembly disposed on the pressure plate and connected to the two drive arms. The sliding engagement assembly is connected to a locking structure. When the two drive arms approach each other, the locking structure can perform a locking action on the horizontal arm. The sliding engagement assembly causes the upper mold to move up relative to the pressure plate.

[0020] As a further embodiment of the present invention: the sliding fit assembly includes a guide frame disposed at the bottom of the pressure plate, and two follower arms slidably connected to the guide frame and symmetrically arranged, wherein the follower arms are slidably connected to the drive arm;

[0021] The follower arm has an L-shaped follower block at one end away from the drive arm. The follower block cooperates with a driven block on the upper mold. The driven block is in the shape of an inverted trapezoid, with its upper part slidably connected to the bottom of the pressure plate. The follower block has an inclined surface on the side facing the driven block that cooperates with the driven block. A gap is reserved between the driven block and the upper mold.

[0022] As a further embodiment of the present invention: the locking structure includes two positioning plates symmetrically and movably disposed on the side of the pressure plate and capable of moving in the vertical direction, and two limiting blocks respectively fixedly connected to both ends of the horizontal arm. A connecting member is provided between the positioning plate and the follower arm. The bottom of the positioning plate is arranged in a "V" shape. The limiting block is provided with a V-shaped channel and a rectangular channel. The rectangular channel is adapted to the positioning plate.

[0023] As a further embodiment of the present invention: the connecting member includes a guide arm disposed on the side of the pressure plate, a sleeve plate that is slidably connected to the positioning plate and fixedly connected to the guide arm, and the sleeve plate is also fixedly connected to a driven plate, the driven plate being provided with a through groove;

[0024] The follower arm has a protruding post provided through the vertical arm. The protruding post is adapted to the through groove. The protruding post passes through the through groove and is slidably connected to the driven plate. The through groove includes two symmetrically arranged inclined grooves and a straight groove connecting the two inclined grooves.

[0025] The compression molding method for producing laminates based on thermoplastic resin, using the aforementioned compression molding apparatus, includes the following steps:

[0026] Step 1: Stack the thermoplastic resin sheet and fiber fabric to form the blank to be formed. Place the blank into the lower mold, and the positioning mechanism moves forward to correct the deviation of the upper mold.

[0027] Step two: The first hydraulic cylinder drives the pressure plate and the upper mold to move down until the mold is closed. The mold heats up, softening and melting the blank.

[0028] Step 3: The positioning mechanism moves in the opposite direction, and the first reciprocating mechanism and the second reciprocating mechanism move, driving the upper mold to reciprocate in the vertical direction, and the upper mold and the lower mold to reciprocate in the horizontal direction.

[0029] Step four: The mold stops moving, the positioning mechanism moves forward again, and the first hydraulic cylinder increases the pressure to press the blank into shape;

[0030] Step 5: Separate the molds and remove the laminate formed in the lower mold.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] This application, by setting up a first reciprocating mechanism and a second reciprocating mechanism, allows the first reciprocating mechanism to drive the lower and upper molds to reciprocate synchronously in the horizontal direction after mold closing. This facilitates the diffusion of molten material in the mold and ensures the integrity of the die. The second reciprocating mechanism drives the upper mold to reciprocate relative to the lower mold in the vertical direction. The upper mold can then generate a gentle tapping action on the molten material. This tapping action can generate a certain shear force and disturbance on the material, making it easier for the molecular chain segments inside the material to slide, thereby reducing the apparent viscosity, improving its fluidity, and avoiding product defects caused by material accumulation or uneven distribution, such as inconsistent local density and dimensional deviations. At the same time, in conjunction with the mold's venting design, it can more effectively expel the gas in the mold cavity, reduce the generation of pores, and improve the quality of the product. For multi-layer laminates, the tapping action of the upper mold can enhance the bonding force between the layers, making the interface between the layers tighter and improving the overall performance and reliability of the product.

[0033] Specifically, the coordinated motion generated by the first and second reciprocating mechanisms allows the molten material to be subjected to dynamic forces in three-dimensional space. This helps the material to be distributed more evenly within the mold, enabling it to better fill all parts of the mold. This is particularly beneficial for molds with complex shapes, fine structures, or thin walls, significantly improving filling efficiency and reducing porosity and defects. Furthermore, this composite motion mode makes the stress on the material within the mold more uniform, reducing localized stress concentration. For areas prone to stress concentration, such as corners, edges, and joints of the mold, the composite motion can alleviate stress concentration and reduce the risk of cracking or failure during use.

[0034] In addition, during the reciprocating motion of the upper mold, its downward movement is powered by the instantaneous rebound of the spring, which enables the rapid patting of the molten material in the mold. Furthermore, due to the rapid rebound of the spring, it is possible to achieve the effect of instantaneous energy injection, breaking the internal viscous constraints of the material, making the filling process smoother, and optimizing the molding process. Attached Figure Description

[0035] Figure 1 An isometric view of one embodiment of a molding apparatus for producing laminates based on thermoplastic resin.

[0036] Figure 2 This is a schematic diagram of one embodiment of a molding apparatus for producing laminates based on thermoplastic resin.

[0037] Figure 3 This is a schematic diagram of another aspect of an embodiment of a molding apparatus for producing laminates based on thermoplastic resin.

[0038] Figure 4 This is a schematic diagram of another aspect of an embodiment of a molding apparatus for producing laminates based on thermoplastic resin.

[0039] Figure 5 for Figure 3 Enlarged view of the structure at point A in the middle.

[0040] Figure 6 for Figure 4 Enlarged view of the structure at point B in the middle.

[0041] Figure 7 This is a schematic diagram showing the connection relationship between the first reciprocating mechanism and the second reciprocating mechanism in one embodiment of a molding apparatus for producing laminates based on thermoplastic resin.

[0042] Figure 8 for Figure 7 A structural diagram from another angle.

[0043] Figure 9 This is a schematic diagram of the connection state between the pressure plate and the upper mold in one embodiment of a molding apparatus for producing laminates based on thermoplastic resin.

[0044] Figure 10 for Figure 9 A structural diagram from another angle.

[0045] Figure 11 for Figure 10 The front view.

[0046] In the diagram: 1. Support; 2. Bracket; 201. Guide pin; 3. Pressure plate; 301. Guide port; 4. Upper mold; 401. Support arm; 402. Guide groove; 5. Lower mold; 6. First hydraulic cylinder; 7. Horizontal arm; 8. Column; 9. Spring; 10. Limiting block; 1001. V-shaped channel; 1002. Rectangular channel; 11. Guide frame; 12. Follower arm; 13. Vertical arm; 1301. Protruding column; 14. Guide arm; 15. Sleeve plate; 6. Positioning plate; 17. Driven plate; 1701. Inclined groove; 1702. Straight groove; 18. Second hydraulic cylinder; 19. Drive arm; 20. Follower block; 2001. Inclined surface; 21. Driven block; 22. Assembly plate; 23. Drive motor; 24. Vertical shaft; 2401. Strip protrusion; 25. Sleeve; 2501. Strip groove; 26. Incomplete gear; 27. Gear plate; 28. Guide block; 29. ​​Drive disc; 30. Connecting rod. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0049] Please see Figures 1-11 In this embodiment of the invention, the molding apparatus for producing laminates based on thermoplastic resin includes a support 1 and a bracket 2 disposed on the support 1, and further includes:

[0050] The pressure plate 3 is slidably mounted on the support 2 and can be driven to rise and fall by the first hydraulic cylinder 6 mounted on the support 2. The pressure plate 3 is provided with a guide port 301 along the length direction of the support 1, and a cross arm 7 is slidably mounted in the guide port 301.

[0051] The upper mold 4 and the lower mold 5 are connected to the cross arm 7 through multiple sets of elastic structures. The lower mold 5 is movably mounted on the support 2. When the upper mold 4 and the lower mold 5 are closed, the cross arm 7 can be driven by the first reciprocating mechanism mounted on the support 1 to drive the upper mold 4 and the lower mold 5 to reciprocate along the length direction of the support 1. The support arm 401 mounted on the side of the upper mold 4 can be driven by the second reciprocating mechanism mounted on the support 1 to make the upper mold 4 and the lower mold 5 move relative to each other in the vertical direction.

[0052] The positioning mechanism, located on the pressure plate 3, can cause the upper mold 4 to move upward relative to the pressure plate 3 and cooperate with the horizontal arm 7.

[0053] Furthermore, during actual processing, the blank is placed in the lower mold 5. Subsequently, the positioning mechanism works. First, it cooperates with the horizontal arm 7 to lock the horizontal arm 7, preventing the upper mold 4 from deviating in position due to the relative sliding between the horizontal arm 7 and the pressure plate 3 during the mold closing process, which could lead to problems with mold closing accuracy or even mold damage. Then, the positioning mechanism drives the upper mold 4 to move upward relative to the pressure plate 3, so that the pressure provided by the first hydraulic cylinder 6 to the pressure plate 3 can be directly transmitted to the blank through the upper mold 4 to meet the pressure required for processing.

[0054] After the mold is closed, the upper mold 4 and lower mold 5 are heated (electric heating can be used) to melt the thermoplastic resin. The positioning mechanism releases the lock on the horizontal arm 7, and the first and second reciprocating mechanisms operate. Specifically, the first reciprocating mechanism drives the lower mold 5 to reciprocate along the length of the support 1 on the bracket 2 (the bracket 2 is provided with a guide pin 201, and the lower mold 5 is slidably connected to the guide pin 201, which is used to guide the lower mold 5). Consequently, the upper mold 4 can reciprocate horizontally along with the lower mold 5. At the same time, the second reciprocating mechanism drives the upper mold 4 to reciprocate vertically relative to the pressure plate 3. 4 can exert a gentle tapping effect on the molten material in the mold. This tapping effect can generate a certain shear force and disturbance on the material, making it easier for the molecular chain segments inside the material to slide, thereby reducing the apparent viscosity, improving its fluidity, and avoiding product defects caused by material accumulation or uneven distribution, such as local density inconsistencies and dimensional deviations. At the same time, in conjunction with the mold's venting design, it can more effectively expel the gas in the mold cavity, reduce the generation of pores, and improve the quality of the product. For multi-layer laminates, the tapping effect of the upper mold 4 can enhance the bonding force between the layers, making the interface between the layers tighter, and improving the overall performance and reliability of the product.

[0055] Please refer to it again. Figure 7 and Figure 9The elastic structure includes a column 8 fixed to the support arm 401 and a spring 9 sleeved on the outer periphery of the column 8. The column 8 is slidably connected to the cross arm 7. The two ends of the spring 9 are respectively connected to the support arm 401 and the cross arm 7. The second reciprocating mechanism includes a vertical shaft 24 rotatably mounted on the support 1 and a drive motor 23 mounted on the support 1 and whose output end is connected to the vertical shaft 24. The vertical shaft 24 is connected to the first reciprocating mechanism and is also connected to the support arm 401 through a drive assembly. The drive assembly can cause the spring 9 to reciprocate by compressing and rebounding.

[0056] It should be noted that the column 8 is arranged in a stepped shaft shape, that is, the end of the column 8 away from the support arm 401 is fixedly provided with a boss to attach... Figure 9 Taking the state as an example, at this time, the boss abuts against the cross arm 7.

[0057] The drive assembly includes an assembly plate 22 fixed to the pressure plate 3 and a sleeve 25 rotatably mounted on the assembly plate 22 and slidably fitted with the vertical shaft 24. The sleeve 25 is connected to the support arm 401 through an intermittent fit structure. The outer wall of the vertical shaft 24 has a strip-shaped protrusion 2401, and the inner wall of the sleeve 25 has a strip-shaped groove 2501. The strip-shaped groove 2501 is adapted to the strip-shaped protrusion 2401, and both are parallel to the central axis of the vertical shaft 24 and the sleeve 25.

[0058] Please refer to it again. Figure 2 , Figure 5 , Figure 7 as well as Figure 9 The intermittent fit structure includes an incomplete gear 26 rotatably mounted on the assembly plate 22 and a toothed plate 27 that engages with the toothed portion of the incomplete gear 26. The toothed plate 27 is L-shaped and is slidably connected to the support arm 401 via a guide groove 402 located at the end of the support arm 401. The rotation shaft of the incomplete gear 26 is connected to the sleeve 25 via a transmission component. A guide block 28 is provided on the side of the assembly plate 22. The toothed plate 27 has a sliding groove on the side facing the guide block 28 that is adapted to the guide block 28. The guide block 28 is slidably fitted into the sliding groove.

[0059] In detail, the transmission component includes a belt and a bevel gear set. The bevel gear set includes a first bevel gear rotatably mounted on the mounting plate 22 and a second bevel gear disposed on the rotating shaft of the incomplete gear 26. The second bevel gear meshes with the first bevel gear, and the belt is used to connect the rotating shaft of the first bevel gear to the sleeve 25.

[0060] During mold closing or opening, the downward or upward movement of the pressure plate 3 drives the sleeve 25 to move synchronously. The sleeve 25 slides downward or upward on the vertical shaft 24. The drive motor 23 drives the vertical shaft 24 to rotate. The vertical shaft 24 can drive the sleeve 25 to rotate through the strip-shaped protrusion 2401 and the strip-shaped groove 2501. The sleeve 25 then drives the incomplete gear 26 to rotate through the transmission component. When the toothed part of the incomplete gear 26 meshes with the toothed plate 27, under the guidance of the guide block 28, the toothed plate 27 will move upward. Correspondingly, the toothed plate 27 drives the upper mold 4 to move relative to the support arm 401. When the pressure plate 3 moves upward, the spring 9 is compressed. After the toothed part on the incomplete gear 26 disengages from the teeth on the toothed plate 27, the spring 9 rebounds, causing the upper mold 4 to quickly move downward and reset. Therefore, the upper mold 4 can produce a gentle tapping effect on the molten material. During the reciprocating motion of the upper mold 4, its downward movement is powered by the instantaneous rebound of the spring 9, realizing the function of quickly tapping the molten material in the mold. Moreover, due to the rapid rebound of the spring 9, the effect of instantaneous energy injection can be achieved, breaking the internal viscous constraints of the material, making the filling process smoother, and optimizing the molding process.

[0061] It should be emphasized that after the mold is closed, the upper mold 4 moves up and down with appropriate amplitude, and the upper mold 4 does not separate from the lower mold 5 throughout the process.

[0062] Please refer to it again. Figure 2 and Figure 7 The first reciprocating mechanism includes a drive disk 29 rotatably mounted on the support 1 and a connecting rod 30 hinged to the eccentric part of the drive disk 29. The end of the connecting rod 30 away from the drive disk 29 is hinged to the side of the lower mold 5. The rotation shaft of the drive disk 29 is connected to the vertical shaft 24 via a chain.

[0063] When the drive motor 23 drives the vertical shaft 24 to rotate, the vertical shaft 24 will drive the drive disk 29 to rotate via the chain. Then, under the guidance of the guide pin 201, the drive disk 29 will drive the lower mold 5 to reciprocate along the length direction of the support 1 on the bracket 2 via the connecting rod 30. Correspondingly, the upper mold 4 will reciprocate along with the lower mold 5. The horizontal arm 7 and the pressure plate 3 slide relative to each other. The setting of the guide groove 402 effectively ensures the connection state between the toothed plate 27 and the support arm 401, realizing the synchronization of the reciprocating striking function of the upper mold 4 and the horizontal reciprocating function of the mold.

[0064] Therefore, based on the vertical reciprocating motion of the upper mold 4, the horizontal reciprocating motion of the upper mold 4 and the lower mold 5 allows the molten material to be subjected to dynamic forces in three-dimensional space, further enhancing the fluidity of the molten material and improving the molding effect. Specifically, the vertical reciprocating motion promotes material flow and venting, while the horizontal reciprocating motion helps the material to be distributed more evenly within the mold, allowing the material to better fill all parts of the mold. Especially for molds with complex shapes, fine structures, or thin walls, this significantly improves the filling effect and reduces the generation of pores and defects. Moreover, this composite motion mode makes the stress on the material within the mold more uniform, reducing the phenomenon of local stress concentration. For some areas prone to stress concentration, such as corners, edges, and joints of the mold, the composite motion can alleviate stress concentration and reduce the risk of cracking or failure of the product during use.

[0065] Please refer to it again. Figure 3 , Figure 6 , Figure 10 as well as Figure 11 The positioning mechanism includes two drive arms 19 movably mounted on the support 1 and capable of sliding along the length of the support 1. Two second hydraulic cylinders 18 are also hinged to the side of the support 1, and the movable ends of the two second hydraulic cylinders 18 are respectively hinged to the two drive arms 19. It also includes a sliding engagement assembly mounted on the pressure plate 3 and connecting the two drive arms 19. The sliding engagement assembly is connected to a locking structure. When the two drive arms 19 approach each other, the locking structure can perform a locking action on the horizontal arm 7. The sliding engagement assembly causes the upper mold 4 to move upward relative to the pressure plate 3. The sliding engagement assembly includes a guide frame 11 disposed at the bottom of the pressure plate 3, and two follower arms 12 slidably connected to the guide frame 11 and symmetrically arranged. The follower arms 12 are slidably connected to the drive arm 19. An "L"-shaped follower block 20 is disposed at the end of the follower arm 12 away from the drive arm 19. The follower block 20 engages with a driven block 21 disposed on the upper mold 4. The driven block 21 is inverted trapezoidal in shape, with its upper part slidably connected to the bottom of the pressure plate 3. The follower block 20 has an inclined surface 2001 on the side facing the driven block 21 that engages with the driven block 21. A gap is reserved between the driven block 21 and the upper mold 4.

[0066] Before mold closing, driven by the second hydraulic cylinder 18, the two drive arms 19 move closer to each other. Then, under the guidance of the guide frame 11, the two follower arms 12 and the two follower blocks 20 move closer to each other. Before the follower block 20 contacts the driven block 21, the locking structure is triggered. The locking structure can lock the horizontal arm 7, so that the upper mold 4 and the lower mold 5 can be effectively aligned to avoid the mold closing deviation caused by the horizontal arm 7 being in a free state during the mold closing process, which may lead to mold damage.

[0067] After the horizontal arm 7 is locked, the follower block 20 will contact the driven block 21. Specifically, the inclined surface 2001 contacts the side inclined surface of the driven block 21, which can cause the driven block 21 to give way to the upper mold 4. After the inclined surface 2001 separates from the side inclined surface of the driven block 21, the upper part of the upper mold 4 abuts against the bottom of the follower block 20, and the gap reserved between the driven block 21 and the upper mold 4 is filled. Thus, during the mold heating process, the pressure provided by the first hydraulic cylinder 6 to the pressure plate 3 can be directly transmitted to the blank through the upper mold 4, which can accelerate the melting of the material. After the material melts, the two drive arms 19 move away from each other and reset, so that the follower block 20 is pulled out from the gap reserved between the driven block 21 and the upper mold 4. Then the drive motor 23 is started to make the mold perform compound movement. After the material is evenly filled in the mold, the follower block 20 cooperates with the driven block 21 again, and then the first hydraulic cylinder 6 increases the pressure, so that the material is pressed into shape.

[0068] Generally, during compression molding, the pressure needs to be controlled according to the performance requirements of different types of thermoplastic resins and laminates. By setting follower block 20 and driven block 21, it can be ensured that the pressure provided by the first hydraulic cylinder 6 to the pressure plate 3 can be directly transmitted to the blank through the upper mold 4 during pressurization, thus avoiding a series of problems caused by excessive compression of the spring 9.

[0069] Please refer to it again. Figure 11 The locking structure includes two positioning plates 16 symmetrically and movably disposed on the side of the pressure plate 3 and capable of moving in the vertical direction, and two limiting blocks 10 respectively fixedly connected to both ends of the horizontal arm 7. A connecting member is provided between the positioning plate 16 and the follower arm 12. The bottom of the positioning plate 16 is arranged in a "V" shape. The limiting block 10 is provided with a V-shaped channel 1001 and a rectangular channel 1002. The rectangular channel 1002 is adapted to the positioning plate 16.

[0070] Please refer to it again. Figure 9The connecting component includes a guide arm 14 disposed on the side of the pressure plate 3, and a sleeve plate 15 that is slidably sleeved and fixedly connected to the positioning plate 16. The sleeve plate 15 is also fixedly connected to a driven plate 17, which has a through groove. A protruding post 1301 is disposed on the follower arm 12 through the vertical arm 13. The protruding post 1301 is adapted to the through groove, penetrates the through groove, and is slidably connected to the driven plate 17. The through groove includes two symmetrically arranged inclined grooves 1701 and a straight groove 1702 connecting the two inclined grooves 1701.

[0071] As the two follower arms 12 approach each other, the protrusion 1301 will first slide along the inclined groove 1701 and slide with the driven plate 17. The guide arm 14 and the sleeve 15 act as guides, thereby causing the driven plate 17, sleeve 15, and positioning plate 16 to move downwards. Then, the positioning plate 16 will insert into the limiting block 10. Specifically, if there is a deviation in the horizontal position of the cross arm 7 at this time, the bottom side of the positioning plate 16 will contact the side wall of the V-shaped channel 1001, causing... The limiting block 10 is moved to correct the horizontal position of the horizontal arm 7 and the upper mold 4, so as to avoid the problem of deviation between the upper mold 4 and the lower mold 5 when the mold is closed. Then, the positioning plate 16 is inserted into the rectangular channel 1002. Since the positioning plate 16 is compatible with the rectangular channel 1002, the positioning plate 16 can effectively lock the horizontal arm 7 and the upper mold 4 through the limiting block 10. When the protrusion 1301 moves along the straight groove 1702, the follower block 20 will cooperate with the driven block 21.

[0072] As another embodiment of the present invention, a compression molding method for producing laminates based on thermoplastic resin is also proposed, which uses the aforementioned compression molding apparatus and includes the following steps:

[0073] Step 1: Stack the thermoplastic resin sheet and fiber fabric to form the blank to be formed. Place the blank into the lower mold 5. The positioning mechanism moves forward to correct the deviation of the upper mold 4.

[0074] Step 2: The first hydraulic cylinder 6 drives the pressure plate 3 and the upper mold 4 to move down until the mold is closed. The mold heats up, softening and melting the blank.

[0075] Step 3: The positioning mechanism moves in the opposite direction, the first reciprocating mechanism and the second reciprocating mechanism move, driving the upper mold 4 to reciprocate in the vertical direction, and the upper mold 4 and the lower mold 5 to reciprocate in the horizontal direction.

[0076] Step four: The mold stops moving, the positioning mechanism moves forward again, and the first hydraulic cylinder 6 increases the pressure to press the blank into shape;

[0077] Step 5: Separate the molds and remove the laminate formed in the lower mold 5.

[0078] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0079] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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 molding apparatus for producing laminates based on thermoplastic resin, comprising a support and a bracket disposed on the support; Its features are, Also includes: The pressure plate is slidably mounted on the support and can be driven to rise and fall by the first hydraulic cylinder mounted on the support. The pressure plate has a guide port along the length of the support, and a cross arm is slidably mounted in the guide port. The upper mold and the lower mold are connected to the cross arm through multiple sets of elastic structures. The lower mold is movably mounted on the support. When the upper mold and the lower mold are closed, the cross arm can be driven by the first reciprocating mechanism mounted on the support to drive the upper mold and the lower mold to reciprocate along the length direction of the support. The support arm mounted on the side of the upper mold can be driven by the second reciprocating mechanism mounted on the support to make the upper mold and the lower mold move relative to each other in the vertical direction. The positioning mechanism, located on the pressure plate, can cause the upper mold to move relative to the pressure plate and cooperate with the cross arm; The positioning mechanism includes two drive arms movably mounted on the support and capable of sliding along the length of the support. Two second hydraulic cylinders are also hinged to the side of the support, and the movable ends of the two second hydraulic cylinders are respectively hinged to the two drive arms. It also includes a sliding engagement assembly disposed on the pressure plate and connected to the two drive arms. The sliding engagement assembly is connected to a locking structure. When the two drive arms approach each other, the locking structure can perform a locking action on the horizontal arm. The sliding engagement assembly causes the upper mold to move up relative to the pressure plate. The sliding engagement assembly includes a guide frame disposed at the bottom of the pressure plate and two follower arms symmetrically arranged and slidably connected to the guide frame, wherein the follower arms are slidably connected to the drive arm; The follower arm has an "L"-shaped follower block at one end away from the drive arm. The follower block cooperates with a driven block on the upper mold. The driven block is in the shape of an inverted trapezoid, with its upper part slidably connected to the bottom of the pressure plate. The follower block has an inclined surface on the side facing the driven block that cooperates with the driven block. A gap is reserved between the driven block and the upper mold.

2. The molding apparatus for producing laminates based on thermoplastic resin according to claim 1, characterized in that, The elastic structure includes a column fixed to the support arm and a spring sleeved on the outer periphery of the column. The column is slidably connected to the cross arm, and the two ends of the spring are respectively connected to the support arm and the cross arm. The second reciprocating mechanism includes a vertical shaft rotatably mounted on the support and a drive motor mounted on the support with its output end connected to the vertical shaft. The vertical shaft is connected to the first reciprocating mechanism and is also connected to the support arm through a drive assembly. The drive assembly can cause the spring to reciprocate by compressing and rebounding.

3. The molding apparatus for producing laminates based on thermoplastic resin according to claim 2, characterized in that, The drive assembly includes an assembly plate fixed to the pressure plate and a sleeve rotatably mounted on the assembly plate and slidably fitted with the vertical shaft. The sleeve is connected to the support arm through an intermittent fit structure. The outer wall of the vertical shaft has a strip-shaped protrusion, and the inner wall of the sleeve has a strip-shaped groove. The strip-shaped groove is adapted to the strip-shaped protrusion, and both are parallel to the central axis of the vertical shaft and the sleeve.

4. The molding apparatus for producing laminates based on thermoplastic resin according to claim 3, characterized in that, The discontinuous fit structure includes an incomplete gear rotatably mounted on the assembly plate and a toothed plate that engages with the toothed portion of the incomplete gear. The toothed plate is L-shaped and is slidably connected to the support arm through a guide groove located at the end of the support arm. The rotating shaft of the incomplete gear is connected to the sleeve through a transmission component. A guide block is provided on the side of the assembly plate. A groove adapted to the guide block is provided on the side of the toothed plate facing the guide block. The guide block is slidably fitted into the groove.

5. The molding apparatus for producing laminates based on thermoplastic resin according to claim 2, characterized in that, The first reciprocating mechanism includes a drive disk rotatably mounted on the support and a connecting rod hinged to the eccentric part of the drive disk. The end of the connecting rod away from the drive disk is hinged to the side of the lower mold. The rotation shaft of the drive disk is connected to the vertical shaft via a chain.

6. The molding apparatus for producing laminates based on thermoplastic resin according to claim 1, characterized in that, The locking structure includes two positioning plates symmetrically and movably disposed on the side of the pressure plate and capable of moving in the vertical direction, and two limiting blocks respectively fixedly connected to both ends of the horizontal arm. A connecting piece is provided between the positioning plate and the follower arm. The bottom of the positioning plate is set in a "V" shape. The limiting block is provided with a V-shaped channel and a rectangular channel. The rectangular channel is adapted to the positioning plate.

7. The molding apparatus for producing laminates based on thermoplastic resin according to claim 6, characterized in that, The connector includes a guide arm disposed on the side of the pressure plate, a sleeve plate that is slidably connected to the positioning plate and fixedly connected to the guide arm, and a driven plate that is fixedly connected to the sleeve plate, the driven plate being provided with a through groove; The follower arm has a protruding post provided through the vertical arm. The protruding post is adapted to the through groove. The protruding post passes through the through groove and is slidably connected to the driven plate. The through groove includes two symmetrically arranged inclined grooves and a straight groove connecting the two inclined grooves.

8. A compression molding method for producing laminates based on thermoplastic resin, using the compression molding apparatus as described in claim 1, characterized in that, Includes the following steps: Step 1: Stack the thermoplastic resin sheet and fiber fabric to form the blank to be formed. Place the blank into the lower mold, and the positioning mechanism moves forward to correct the deviation of the upper mold. Step two: The first hydraulic cylinder drives the pressure plate and the upper mold to move down until the mold is closed. The mold heats up, softening and melting the blank. Step 3: The positioning mechanism moves in the opposite direction, and the first reciprocating mechanism and the second reciprocating mechanism move, driving the upper mold to reciprocate in the vertical direction, and the upper mold and the lower mold to reciprocate in the horizontal direction. Step four: The mold stops moving, the positioning mechanism moves forward again, and the first hydraulic cylinder increases the pressure to press the blank into shape; Step 5: Separate the molds and remove the laminate formed in the lower mold.

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