A plastic processing forming die

Abstract

This invention relates to the field of plastic production technology, and more particularly to a molding die for plastic processing, comprising a support base, a support frame fixed to the top of the support base, symmetrically distributed telescopic rods fixed to the top of the support frame, an mounting plate fixed to the bottom of the telescopic rods, an upper mold fixed to the bottom of the mounting plate, an upper mold cavity at the bottom of the upper mold, an anti-jamming mechanism inside the upper mold cavity to prevent the molded plastic part from getting stuck inside the upper mold cavity, a lower mold below the upper mold, a lower mold cavity at the top of the lower mold, an ejection mechanism inside the lower mold cavity, a support plate fixed to one side of the bottom of the lower mold, and a rotating mechanism on the side of the bottom of the lower mold away from the support plate; after the mold is opened, the rotating mechanism drives the lower mold to rotate, while the ejection mechanism automatically ejects the product, and the anti-jamming mechanism ensures that the product does not remain stuck in the upper mold, realizing a continuous automated cycle of plastic production and effectively improving plastic production efficiency.

Description

Technical Field

[0001] This invention relates to the field of plastic production technology, specifically a molding die for plastic processing. Background Technology

[0002] Plastic processing refers to the process of turning synthetic resins or plastic raw materials into plastic products with specific shapes and properties through a series of physical or chemical methods. Its main processes include extrusion, injection molding, blow molding, calendering, foaming, and thermoforming. First, the raw materials are pretreated, such as drying, mixing, and plasticizing, to make them processable. Then, under the action of heating and pressure, the plastic melt goes through stages such as flow, filling, molding, and solidification to obtain the desired shape. The whole process involves the precise control of parameters such as temperature, pressure, and time to ensure the dimensional stability and mechanical properties of the product. Plastic processing molds are the core equipment for realizing these processes. Their design and manufacturing level directly determines the precision, efficiency, and quality of the product. For example, injection molds accurately replicate complex parts through cavity structures and are a key technological foundation for the mass production of high-performance plastic products.

[0003] In existing technologies, to facilitate the removal of molded plastic from the lower mold cavity, an ejection mechanism is often provided inside the lower mold cavity. For example, patent number 202221725289.X discloses a high-efficiency molding die for plastic processing. This high-efficiency molding die for plastic processing uses a drive assembly. After the plastic is molded, a hydraulic rod is first activated to move the upper mold base upward, and then an electric push rod is activated. The electric push rod moves the rack plate towards the side closer to the mounting block. The limiting rod and limiting block can improve the stability of the rack plate during movement. The rack plate drives the rotating rod that meshes with it through gears to rotate. The left rotating rod rotates counterclockwise, and the right rotating rod rotates clockwise, causing the rotating rod to drive the drive rod to rotate. The drive rod drives the lifting rod upward through the lifting shaft, and the lifting rod drives the lifting plate upward, thereby pushing the molded plastic on the lifting plate out of the lower mold cavity, achieving the purpose of automated unloading and improving the processing efficiency of plastic.

[0004] However, this type of plastic processing mold has certain defects. Due to the lack of an active anti-jamming structure in the upper mold, the molded plastic often gets stuck inside the upper mold cavity due to unreasonable demolding angle, surface adsorption, or plastic shrinkage and tightness. This makes it impossible for the subsequent ejection mechanism to execute reliably, ultimately leading to the interruption of automated production, reduced efficiency, and increased risk of product damage. Summary of the Invention

[0005] The purpose of this invention is to provide a molding die for plastic processing 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 die for plastic processing includes a support base, a support frame fixed to the top of the support base, symmetrically distributed telescopic rods fixed to the top of the support frame, an installation plate fixed to the bottom of the telescopic rods, an injection molding mechanism mounted on the top of the installation plate, an upper mold fixed to the bottom of the installation plate, an upper cavity provided at the bottom of the upper mold, an anti-jamming mechanism provided inside the upper cavity to prevent the molded plastic part from getting stuck inside the upper cavity, a lower mold provided below the upper mold, a lower cavity provided at the top of the lower mold, an ejection mechanism provided inside the lower cavity, a support plate fixed to one side of the bottom of the lower mold, and a rotating mechanism provided on the side of the bottom of the lower mold away from the support plate. After the plastic is molded, the rotating mechanism drives the lower mold to rotate, and during the rotation of the lower mold, the ejection mechanism ejects the molded plastic part from inside the lower cavity.

[0008] Preferably, the anti-jamming mechanism includes a first groove at the top of the upper mold cavity, a pressure plate inside the first groove, the pressure plate being adapted to the first groove, a sliding rod fixed to the top of the pressure plate, and a guide cylinder fixed to the top of the support frame. The sliding rod passes through the upper mold, the mounting plate, the top of the support frame, and the guide cylinder. A pressure block is fixed to the top of the sliding rod, and the pressure block is connected to the top of the guide cylinder through a first spring. A fixing component is provided inside the guide cylinder. When the upper mold and the lower mold are fitted together, the fixing component is used to fix the sliding rod.

[0009] Preferably, the fixing assembly includes a positioning rod penetrating the side wall of the guide cylinder, wherein the side wall of the slide rod is provided with a positioning groove adapted to the positioning rod, a fixing block is fixed to the end of the positioning rod, the fixing block is connected to the side wall of the guide cylinder by a second spring, the fixing block is provided with a trapezoidal groove inside, the trapezoidal groove penetrates the top and bottom of the fixing block, and the lower end of the side wall away from the positioning rod of the trapezoidal groove is inclined in the direction away from the positioning rod, wherein a stop plate capable of pressing the trapezoidal groove is fixed to the top of the mounting plate.

[0010] Preferably, the rotating mechanism includes a vertical plate fixedly connected to the top of the support base, a rotating rod passing through the inside of the vertical plate, the end of the rotating rod being rotatably connected to the bottom of the lower mold, a pneumatic cylinder fixed to the top of the support base, a pneumatic rod passing through the top of the pneumatic cylinder, the top of the pneumatic rod being in contact with the bottom of the lower mold, a baffle fixed to the outside of the pneumatic rod, the baffle being connected to the top of the pneumatic cylinder via a third spring, wherein the pneumatic cylinder is connected to an air inlet assembly, the air inlet assembly being used to inflate the pneumatic cylinder.

[0011] Preferably, the air intake assembly includes an airbag fixedly connected to the top of the support frame, a compression column is provided below the airbag, the compression column is fixedly connected to the top of the mounting plate, the airbag is connected to an air pipe, and the other end of the air pipe is connected to an air cylinder.

[0012] Preferably, the ejection mechanism includes a second groove at the bottom of the lower mold cavity, a top plate inside the second groove, the top plate being adapted to the second groove, a push rod fixed at the bottom of the top plate, and an extrusion assembly connected to the lower end of the push rod. During the rotation of the lower mold, the extrusion assembly is used to extrude the push rod.

[0013] Preferably, the extrusion assembly includes a movable rod rotatably connected to the bottom of the top rod, and a push rod rotatably connected to the other end of the movable rod. The push rod passes through the support plate and is slidably connected to the support plate. A push block is fixed to the end of the push rod. The push block is connected to the side wall of the support plate through a fourth spring. A wedge-shaped block capable of extruding the push block is fixed to the top of the support base.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the mold realizes the integrated operation of injection molding and automatic unloading through the anti-jamming mechanism, the ejection mechanism and the rotation mechanism. After the mold is opened, the rotation mechanism drives the lower mold to flip, while the ejection mechanism automatically ejects the product. The anti-jamming mechanism ensures that the product does not get stuck in the upper mold, realizing the continuous automated cycle of plastic production and effectively improving the efficiency of plastic production. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the molding die in an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the upper mold connection structure in an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the pressure plate connection structure in an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the trapezoidal groove structure in an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the top plate connection structure in an embodiment of the present invention.

[0020] In the diagram: 1-Support base; 2-Support frame; 3-Anti-jamming mechanism; 31-Pressure plate; 32-Slide rod; 33-Guide cylinder; 34-First spring; 35-Pressure block; 36-Positioning groove; 37-Positioning rod; 38-Fixing block; 39-Trapezoidal groove; 310-Bottoming plate; 311-Second spring; 4-Rotating mechanism; 41-Rotating rod; 42-Upright plate; 43-Pneumatic rod; 44-Baffle; 45-Third spring; 46-Pneumatic cylinder; 47-Air pipe; 48-Airbag; 49-Extrusion column; 5-Ejection mechanism; 51-Top plate; 52-Ejector rod; 53-Moving rod; 54-Push rod; 55-Fourth spring; 56-Push block; 57-Wedge block; 6-Upper mold; 7-Lower mold; 8-Upper mold cavity; 9-Lower mold cavity; 10-Injection mechanism; 11-Telescopic rod; 12-Mounting plate; 13-Support plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0023] In one embodiment, see Figure 1 and Figure 2 A molding die for plastic processing includes a support base 1, a support frame 2 fixed to the top of the support base 1, telescopic rods 11 symmetrically distributed fixed to the top of the support frame 2, an mounting plate 12 fixed to the bottom of the telescopic rods 11, an injection molding mechanism 10 mounted on the top of the mounting plate 12, an upper mold 6 fixed to the bottom of the mounting plate 12, an upper mold cavity 8 provided at the bottom of the upper mold 6, an anti-jamming mechanism 3 provided inside the upper mold cavity 8 to prevent the molded plastic part from getting stuck inside the upper mold cavity 8, a lower mold 7 provided below the upper mold 6, a lower mold cavity 9 provided at the top of the lower mold 7, an ejection mechanism 5 provided inside the lower mold cavity 9, a support plate 13 fixed to one side of the bottom of the lower mold 7, and a rotating mechanism 4 provided on the side of the bottom of the lower mold 7 away from the support plate 13. After the plastic is molded, the rotating mechanism 4 is used to drive the lower mold 7 to rotate, and during the rotation of the lower mold 7, the ejection mechanism 5 is used to eject the molded plastic part from inside the lower mold cavity 9.

[0024] In this embodiment, during the plastic production process, the telescopic rod 11 drives the mounting plate 12 to move downwards, and the mounting plate 12 drives the upper mold 6 to move downwards until the upper mold 6 and the lower mold 7 are tightly fitted together. Then, molten plastic is injected into the upper mold cavity 8 through the injection molding mechanism 10. After the plastic molding and cooling are complete, the telescopic rod 11 drives the upper mold 6 to move upwards through the mounting plate 12, thereby separating the upper mold 6 from the lower mold 7. The upper mold cavity 8 is equipped with an anti-jamming mechanism 3, which effectively prevents the molded plastic from getting stuck inside the upper mold cavity 8. When the upper mold 6 and the lower mold 7 separate... Subsequently, as the mounting plate 12 continues to move upward, the rotating mechanism 4 drives the lower mold 7 to rotate. During the rotation of the lower mold 7, the ejection mechanism 5 automatically ejects the molded plastic from the lower mold cavity 9, thereby achieving automatic material unloading. That is, this mold realizes the integrated operation of injection molding and automatic material unloading through the anti-jamming mechanism 3, the ejection mechanism 5 and the rotating mechanism 4. After the mold is opened, the rotating mechanism 4 drives the lower mold 7 to rotate, and at the same time the ejection mechanism 5 automatically ejects the product. The anti-jamming mechanism 3 ensures that the product does not remain in the upper mold, realizing the continuous automated cycle of plastic production and effectively improving the efficiency of plastic production.

[0025] Please see Figure 3 The anti-jamming mechanism 3 includes a first groove at the top of the upper mold cavity 8. A pressure plate 31 is provided inside the first groove. The pressure plate 31 is adapted to the first groove. A sliding rod 32 is fixed to the top of the pressure plate 31. A guide cylinder 33 is fixed to the top of the support frame 2. The sliding rod 32 passes through the upper mold 6, the mounting plate 12, the top of the support frame 2, and the guide cylinder 33. A pressure block 35 is fixed to the top of the sliding rod 32. The pressure block 35 is connected to the top of the guide cylinder 33 through a first spring 34. A fixing component is provided inside the guide cylinder 33. When the upper mold 6 and the lower mold 7 are fitted together, the fixing component is used to fix the sliding rod 32.

[0026] During the plastic production process, the telescopic rod 11 drives the mounting plate 12 to move downwards, which in turn drives the upper mold 6 to move downwards until the upper mold 6 and the lower mold 7 are tightly fitted together. During the downward movement of the upper mold 6, the pressure plate 31 is also driven downwards. The pressure plate 31 is always located inside the first groove. After the upper mold 6 and the lower mold 7 are tightly fitted together, the fixing component inside the guide cylinder 33 automatically fixes the sliding rod 32. After the plastic is molded, the telescopic rod 11 drives the upper mold 6 to move upwards through the mounting plate 12. The pressure plate 31 remains stationary under the action of the fixing component. That is, when the upper mold 6 and the lower mold 7 are initially separated, the pressure plate 31 does not move upwards with the upper mold 6. In other words, the pressure plate 31 plays a holding role for the molded plastic part, thereby effectively preventing the molded plastic from getting stuck inside the upper mold cavity 8. When the mounting plate 12 moves upwards to a certain position, the fixing component automatically releases the fixing of the sliding rod 32. The pressure plate 31 automatically resets under the action of the sliding rod 32, the pressure block 35, and the first spring 34, and then re-enters the first groove.

[0027] Please see Figure 1 , Figure 3 and Figure 4 The fixing assembly includes a positioning rod 37 that penetrates the side wall of the guide cylinder 33. The side wall of the slide rod 32 is provided with a positioning groove 36 that is adapted to the positioning rod 37. A fixing block 38 is fixed to the end of the positioning rod 37. The fixing block 38 is connected to the side wall of the guide cylinder 33 through a second spring 311. The fixing block 38 is provided with a trapezoidal groove 39 inside. The trapezoidal groove 39 penetrates the top and bottom of the fixing block 38. The lower end of the side wall of the trapezoidal groove 39 away from the positioning rod 37 is inclined in a direction away from the positioning rod 37. The top of the mounting plate 12 is fixed with a stop plate 310 that can squeeze the trapezoidal groove 39.

[0028] During the plastic production process, the telescopic rod 11 drives the mounting plate 12 to move downwards, which in turn drives the upper mold 6 to move downwards. When the upper mold 6 and the lower mold 7 are tightly fitted together, the positioning rod 37 and the positioning groove 36 are perfectly aligned. Under the action of the fixing block 38 and the second spring 311, the positioning rod 37 automatically enters the positioning groove 36. At this time, the positioning rod 37 fixes the sliding rod 32 through the positioning groove 36, thus preventing the pressure plate 31 from moving upwards with the upper mold 6 when the upper mold 6 and the lower mold 7 are initially separated. When the mounting plate 12 moves upwards to a certain position, the upper end of the abutment plate 310 at the top of the mounting plate 12 enters the trapezoidal groove 39 inside the fixing block 38. At this time, the abutment plate 310 presses against the inclined surface of the trapezoidal groove 39, and the pressure plate 310 is subjected to pressure. The compression causes the fixing block 38 to move the positioning rod 37 away from the slide rod 32, thereby causing the fixing block 38 to move the positioning rod 37 to the outside of the positioning groove 36. Without the fixing of the positioning rod 37, the pressure plate 31 automatically resets under the action of the slide rod 32, the pressure block 35 and the first spring 34, and then re-enters the first groove.

[0029] Please see Figure 5 The rotating mechanism 4 includes a vertical plate 42 fixedly connected to the top of the support base 1. A rotating rod 41 passes through the interior of the vertical plate 42. The end of the rotating rod 41 is rotatably connected to the bottom of the lower mold 7. A pneumatic cylinder 46 is fixed to the top of the support base 1. A pneumatic rod 43 passes through the top of the pneumatic cylinder 46. The top of the pneumatic rod 43 abuts against the bottom of the lower mold 7. A baffle 44 is fixed to the outside of the pneumatic rod 43. The baffle 44 is connected to the top of the pneumatic cylinder 46 through a third spring 45. The pneumatic cylinder 46 is connected to an air inlet assembly, which is used to inflate the pneumatic cylinder 46.

[0030] After the upper mold 6 separates from the lower mold 7, as the mounting plate 12 continues to move upward, the air intake component inflates the air cylinder 46. The increased air pressure inside the air cylinder 46 drives the air rod 43 to move upward. During the upward movement of the air rod 43, it squeezes the bottom of the lower mold 7, causing the lower mold 7 to rotate around the rotating rod 41, thus facilitating the demolding of the molded plastic. When the upper mold 6 moves downward, the air intake component stops inflating the air cylinder 46, the air pressure inside the air cylinder 46 decreases, and the air rod 43 automatically resets under the action of the baffle 44 and the third spring 45. The air rod 43 no longer supports the lower mold 7, and the lower mold 7 automatically resets under the action of gravity until the support plate 13 at the bottom of the lower mold 7 falls on the top of the support base 1. In order to ensure that the air rod 43 can move stably, a piston block is fixed at one end of the air rod 43 inside the air cylinder 46, and the piston block is slidably connected to the inner wall of the air cylinder 46.

[0031] Please see Figure 2 and Figure 5The air intake assembly includes an airbag 48 fixedly connected to the top of the support frame 2, and a compression column 49 is provided below the airbag 48. The compression column 49 is fixedly connected to the top of the mounting plate 12. The airbag 48 is connected to an air pipe 47, and the other end of the air pipe 47 is connected to an air cylinder 46.

[0032] After the upper mold 6 separates from the lower mold 7, as the mounting plate 12 continues to move upward, the extrusion column 49 at the top of the mounting plate 12 will extrude the airbag 48. After the airbag 48 is extruded, the gas inside it will enter the air cylinder 46 through the air pipe 47, thereby increasing the air pressure inside the air cylinder 46 and driving the air rod 43 to move upward.

[0033] Please see Figure 5 The ejection mechanism 5 includes a second groove at the bottom of the lower mold cavity 9. A top plate 51 is provided inside the second groove. The top plate 51 is adapted to the second groove. A push rod 52 is fixed at the bottom of the top plate 51. An extrusion assembly is connected to the lower end of the push rod 52. During the rotation of the lower mold 7, the extrusion assembly is used to extrude the push rod 52.

[0034] After the upper mold 6 separates from the lower mold 7, as the mounting plate 12 continues to move upward, the lower mold 7 begins to rotate. During the rotation of the lower mold 7, the extrusion assembly extrudes the ejector rod 52, and the ejector rod 52 drives the top plate 51 to move upward. The top plate 51 then ejects the molded plastic from the lower mold cavity 9, thereby achieving automatic demolding.

[0035] Please see Figure 5 The extrusion assembly includes a movable rod 53 rotatably connected to the bottom of the top rod 52, and a push rod 54 rotatably connected to the other end of the movable rod 53. The push rod 54 passes through the support plate 13 and is slidably connected to the support plate 13. A push block 56 is fixed to the end of the push rod 54. The push block 56 is connected to the side wall of the support plate 13 through a fourth spring 55. A wedge block 57 that can extrude the push block 56 is fixed to the top of the support base 1.

[0036] After the upper mold 6 separates from the lower mold 7, the lower mold 7 begins to rotate as the mounting plate 12 continues to move upward. During the rotation of the lower mold 7, the support plate 13 drives the push block 56 to move via the push rod 54. During the movement of the push block 56, the wedge block 57 squeezes the push block 56, so that the push block 56 can drive the push rod 54 to move during the rotation of the lower mold 7. The push rod 54 then drives the ejector rod 52 to move via the movable rod 53, so that the ejector rod 52 can push the molded plastic out of the lower mold cavity 9 through the top plate 51. When the lower mold 7 is reset, the wedge block 57 no longer squeezes the push block 56, and the push block 56 automatically resets under the action of the fourth spring 55. The top plate 51 then re-enters the second groove.

[0037] Working Principle: During the plastic production process, the telescopic rod 11 drives the mounting plate 12 downward, which in turn drives the upper mold 6 downward until the upper mold 6 and lower mold 7 are tightly fitted together. During the downward movement of the upper mold 6, the pressure plate 31 also moves downward. The pressure plate 31 remains inside the first groove. After the upper mold 6 and lower mold 7 are tightly fitted, the positioning rod 37 aligns perfectly with the positioning groove 36. Under the action of the fixing block 38 and the second spring 311, the positioning rod 37 automatically enters the positioning groove 36. At this point, the positioning rod 37 fixes the sliding rod 32 through the positioning groove 36. After the plastic is molded, the telescopic rod 11 drives the upper mold 6 upward via the mounting plate 12. The pressure plate 31 does not move upward with the upper mold 6. Therefore, when the upper mold 6 and lower mold 7 initially separate, the pressure plate 31 holds the molded plastic, effectively preventing the molded plastic from getting stuck inside the upper mold cavity 8. When the mounting plate 12 moves upward to a certain position, as the mounting plate 12 continues to move upward, the extrusion column 49 at the top of the mounting plate 12 will extrude the airbag 48. After the airbag 48 is extruded, the gas inside it will enter the air cylinder 46 through the air pipe 47. The air pressure inside the air cylinder 46 increases, causing the air rod 43 to move upward. During the upward movement of the air rod 43, it extrudes the bottom of the lower mold 7, causing the lower mold 7 to rotate around the rotating rod 41. During the rotation of the lower mold 7, the support plate 13 drives the push block 56 to move through the push rod 54. During the movement of the push block 56, the wedge block 57 extrudes the push block 56, so that the push block 56 can drive the push rod 54 to move during the rotation of the lower mold 7. The push rod 54 then drives the ejector rod 52 to move through the movable rod 53. The ejector rod 52 drives the top plate 51 to move upward, and the top plate 51 ejects the molded plastic from the lower mold cavity 9, thereby achieving automatic demolding.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A molding die for plastic processing, comprising a support base; characterized in that, A support frame is fixed to the top of the support base, and symmetrically distributed telescopic rods are fixed to the top of the support frame. An installation plate is fixed to the bottom of the telescopic rods. An injection molding mechanism is installed on the top of the installation plate, and an upper mold is fixed to the bottom of the installation plate. An upper mold cavity is provided at the bottom of the upper mold, and an anti-jamming mechanism is provided inside the upper mold cavity to prevent the molded plastic part from getting stuck inside the upper mold cavity. A lower mold is provided below the upper mold, and a lower mold cavity is provided at the top of the lower mold. An ejection mechanism is provided inside the lower mold cavity. A support plate is fixed to one side of the bottom of the lower mold, and a rotating mechanism is provided on the side of the bottom of the lower mold away from the support plate. After the plastic is molded, the rotating mechanism is used to drive the lower mold to rotate, and during the rotation of the lower mold, the ejection mechanism is used to eject the molded plastic part from inside the lower mold cavity. The anti-jamming mechanism includes a first groove at the top of the upper mold cavity, a pressure plate inside the first groove, the pressure plate being adapted to the first groove, a sliding rod fixed to the top of the pressure plate, a guide cylinder fixed to the top of the support frame, the sliding rod passing through the upper mold, the mounting plate, the top of the support frame and the guide cylinder, a pressure block fixed to the top of the sliding rod, the pressure block being connected to the top of the guide cylinder by a first spring, wherein a fixing component is provided inside the guide cylinder, and when the upper mold and the lower mold are fitted together, the fixing component is used to fix the sliding rod; The fixing assembly includes a positioning rod that penetrates the side wall of the guide cylinder, wherein the side wall of the slide rod is provided with a positioning groove adapted to the positioning rod, a fixing block is fixed to the end of the positioning rod, the fixing block is connected to the side wall of the guide cylinder by a second spring, the fixing block is provided with a trapezoidal groove inside, the trapezoidal groove penetrates the top and bottom of the fixing block, and the lower end of the side wall away from the positioning rod of the trapezoidal groove is inclined in the direction away from the positioning rod, wherein a backing plate that can squeeze the trapezoidal groove is fixed to the top of the mounting plate; When the upper mold and lower mold are initially separated, the pressure plate will not move upward with the upper mold. When the mounting plate moves upward to a certain position, the upper end of the abutment plate at the top of the mounting plate enters the trapezoidal groove inside the fixing block. At this time, the abutment plate squeezes the inclined surface of the trapezoidal groove, causing the fixing block to move the positioning rod to the outside of the positioning groove. The pressure plate automatically resets under the action of the sliding rod, the pressure block and the first spring, and then re-enters the first groove.

2. The molding die for plastic processing according to claim 1, characterized in that, The rotating mechanism includes a vertical plate fixedly connected to the top of the support base, a rotating rod passing through the inside of the vertical plate, the end of the rotating rod being rotatably connected to the bottom of the lower mold, a pneumatic cylinder fixed to the top of the support base, a pneumatic rod passing through the top of the pneumatic cylinder, the top of the pneumatic rod being in contact with the bottom of the lower mold, a baffle fixed to the outside of the pneumatic rod, the baffle being connected to the top of the pneumatic cylinder via a third spring, wherein the pneumatic cylinder is connected to an air inlet assembly, the air inlet assembly being used to inflate the pneumatic cylinder.

3. A molding die for plastic processing according to claim 2, characterized in that, The air intake assembly includes an airbag fixedly connected to the top of the support frame, a compression column is provided below the airbag, the compression column is fixedly connected to the top of the mounting plate, the airbag is connected to an air pipe, and the other end of the air pipe is connected to an air cylinder.

4. A molding die for plastic processing according to claim 1, characterized in that, The ejection mechanism includes a second groove at the bottom of the lower mold cavity, a top plate inside the second groove, the top plate being adapted to the second groove, a push rod fixed at the bottom of the top plate, and an extrusion assembly connected to the lower end of the push rod. During the rotation of the lower mold, the extrusion assembly is used to extrude the push rod.

5. A molding die for plastic processing according to claim 4, characterized in that, The extrusion assembly includes a movable rod rotatably connected to the bottom of the top rod, and a push rod rotatably connected to the other end of the movable rod. The push rod passes through the support plate and is slidably connected to the support plate. A push block is fixed to the end of the push rod. The push block is connected to the side wall of the support plate through a fourth spring. A wedge-shaped block capable of extruding the push block is fixed to the top of the support base.

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