Plastic molding device and plastic molding method

Abstract

The present invention discloses a plastic molding device and a plastic molding method, including a device base, a fixed mold, a movable mold and an injection molding mechanism. The fixed mold and the movable mold are molded together to form a molding cavity. An injection molding pipe A is arranged on the side of the fixed mold away from the movable mold. An adding mechanism is arranged inside the fixed mold. The adding mechanism includes a sealing material box, a mold release agent pipeline and a material replenishing material box. The injection molding mechanism includes an injection molding pipe B. A locking mechanism is symmetrically arranged outside the device base. The locking mechanism includes a locking block. The fixed mold and the movable mold are respectively provided with a fixed mold ejector rod group and a movable mold ejector rod group inside. The present invention can autonomously add a mold release agent to the inside of the molding cavity before injection molding to reduce the demoulding resistance and avoid damage to the product caused by subsequent demoulding; it can make two locking blocks slide and lock on the outside of the movable mold in the mold closing state to prevent the mold from expanding in the mold closing state and causing flash on the product. Autonomous demoulding can be performed during the mold opening process.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic molding, and in particular to a plastic molding device and a plastic molding method. Background Art

[0002] Plastic parts are made of a mixture of synthetic resin and various additives, using injection, extrusion, blow molding, vacuum forming, molding or calendering. Among them, injection molding, also known as injection molding, is the main method for thermoplastic molding. Injection molding is divided into plunger injection molding and screw injection molding. Screw injection molding is the most commonly used method for mass production of plastic parts. The working process of screw injection molding is to feed the granular plastic from the hopper of the injection molding machine into the heated barrel, so that the granular plastic is heated and melted in the barrel to become a viscous melt, and then the high pressure of the screw of the injection molding machine pushes the melt through the nozzle to inject it into the mold cavity. After a certain period of pressure holding and cooling, the melt will maintain the shape given by the mold cavity, and then the mold can be opened and ejected to obtain the molded plastic parts.

[0003] After searching, the invention patent with Chinese patent number CN 114919123 B discloses an injection molding device, including an injection device, a cylinder, a screw, a molding mold, a demoulding mechanism and a support guide seat. A heating device is arranged outside the cylinder, one end of the cylinder is a cylinder nozzle, the cylinder nozzle is connected to the molding mold, the molding mold is connected to the demoulding mechanism, the molding mold is also connected to a cooling system, a preheating pipe is wound inside the support guide seat, the preheating pipe is connected to the cooling system, the preheating pipe is connected to a circulation pipe, the circulation pipe is wound inside the heating device, a heat conducting wire is wound on the screw, one end of the heat conducting wire is fixed, and the other end extends to the cylinder material port and the inner wall of the injection device. Compared with the prior art, the invention patent with Chinese patent number CN 114919123 B can prevent the material port from being blocked through pipeline circulation and heat conducting wire, and can avoid the situation where the molten material is suddenly cooled and causes poor molding quality, that is, it has the effect of improving the quality of the finished product.

[0004] However, during the demoulding process, the demoulding mechanism in the above-mentioned injection molding device relies on the ejector rod in the demoulding mechanism to mechanically eject the workpiece, which is easy to cause damage to the workpiece, and manually wiping the demoulding agent before injection molding will seriously affect the work efficiency; and the dynamic mold in the demoulding mechanism in the injection and pressure holding stages The mold tensioning force that separates the mold and the maintenance of the closing force applied to the mold both rely on the locking force of the hydraulic rod, and the fluctuation of the oil pressure inside the hydraulic rod or the pressure relief phenomenon will affect the locking force of the dynamic mold, thereby affecting the quality of the workpiece; and after the mold is opened, the workpiece may remain on the inside of the fixed mold due to the existence of demoulding resistance and is difficult to demould independently. Therefore, a plastic molding device that can add a demoulding agent to the inside of the mold to reduce damage, mechanically lock the dynamic mold, and can demould independently is needed. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art that manual wiping of the release agent will seriously affect the work efficiency, the hydraulic locking of the movable mold will affect the locking force of the movable mold, and the inner side of the fixed mold is difficult to demold independently, and to propose a plastic molding device and a plastic molding method.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A plastic molding device, comprising a device base, a fixed mold, a movable mold and an injection molding mechanism arranged on the top of the device base, wherein the fixed mold and the movable mold are molded together to form a molding cavity, an injection molding pipe A is arranged on the side of the fixed mold away from the movable mold, an adding mechanism for adding a mold release agent to the molding cavity through the injection molding pipe A is arranged inside the fixed mold, the adding mechanism comprises a sealed material box embedded in the fixed mold, a mold release agent pipe fixedly connected to the bottom of the sealed material box, and a feeding material box fixedly connected to the top of the fixed mold, a pushing piston is arranged inside the sealed material box, and the sealed material box and the feeding material box are fixedly connected to each other. A feeding pipe is provided, and a docking groove is provided at the connection point between the release agent pipeline and the injection molding pipeline A, and a sealing ring plate and an inner bias sealing plate are provided inside the docking groove. The injection molding mechanism includes an injection molding pipeline B fixedly connected to the outside of the heating barrel, and the injection molding pipeline B can be tightly inserted into the injection molding pipeline A; two locking mechanisms for locking the movable mold are symmetrically provided on the outside of the device base, and the locking mechanism includes a locking block symmetrically slidably connected to the top of the device base; a fixed mold ejector rod group and a movable mold ejector rod group are respectively provided inside the fixed mold and the movable mold, and connecting parts are provided outside the fixed mold ejector rod group and the movable mold ejector rod group.

[0008] The above technical solution further includes:

[0009] A mold hydraulic rod is arranged outside the movable mold, and cooling pipe groups are arranged inside the fixed mold and the movable mold; water can be continuously supplied to the interior of the cooling pipe group through a water pump to achieve the purpose of cooling the workpiece inside the molding cavity and assisting molding.

[0010] The injection molding mechanism also includes an advance and retreat hydraulic rod installed on the inner side of the device base and a sliding base slidably connected to the top of the device base, the output end of the advance and retreat hydraulic rod is fixedly connected to the sliding base, the heating barrel is fixedly connected to the top of the sliding base, a hopper is arranged on the top of the heating barrel, an injection molding hydraulic rod is installed on the inner side of the sliding base, the output end of the injection molding hydraulic rod is fixedly connected to a pushing motor, the output shaft of the pushing motor is fixedly connected to a pushing screw, and an injection molding nozzle is arranged at the end of the pushing screw; by telescoping the advance and retreat hydraulic rod, the sliding base can drive the injection molding pipe B to be plugged in or out of the injection molding pipe A to avoid cooling and blockage at the end of the injection molding pipe B; by starting the pushing motor, the pushing screw can push the granular plastic falling from the hopper into the heating zone for heating, and by telescoping the injection molding hydraulic rod, the injection molding nozzle and the pushing screw can be moved forward for injection molding, stopped for pressure maintenance, and moved backward for loading in the heating barrel.

[0011] An electromagnet block A and an iron connecting block A are installed opposite to each other on the inner side of the sealing material box and the outer side of the pushing piston, respectively. When the electromagnet block A is energized, the iron connecting block A is adsorbed. A return spring group A is fixedly connected between the pushing piston and the sealing material box, and a one-way valve is arranged on the outside of the feeding pipe. A sealing slide groove is connected to the bottom of the docking groove, and the sealing ring plate is slidably connected to the inside of the sealing slide groove. An electromagnet block B and an iron connecting block B are installed opposite to each other on the inside of the sealing slide groove and the bottom of the sealing ring plate, respectively. A return spring group B is fixedly connected between the sealing ring plate and the sealing slide groove. When the electromagnet block A is energized, the release agent can enter the inside of the molding cavity through the injection pipe A. When the electromagnet block A is de-energized, the release agent pipe can suck out the release agent from the inside of the molding cavity.

[0012] A touch switch A connected to the power circuit of the electromagnet block A and a touch switch B connected to the power circuit of the electromagnet block B are installed on the inner side of the injection molding pipe A. A through groove is provided on the outer side of the injection molding pipe B, and an outer biased abutment plate is provided inside the through groove. An abutment groove is also provided on the outer side of the injection molding pipe B. When the injection molding pipe B is inserted into the interior of the injection molding pipe A, the touch switch A can be short-touched and the touch switch B can be long-touched, so that the release agent enters the interior of the molding cavity and the injection molding pipe A is opened.

[0013] The locking mechanism also includes a fixing frame A fixedly connected to the top of the device base and a damping rod that rotates in a damping manner on the top of the device base, the fixing frame A is symmetrically slidably connected to the outside of the locking block with a meshing toothed rod A fixedly connected, the damping rod is symmetrically fixedly connected to the outside of the meshing gear A meshing with the meshing toothed rod A, the middle of the damping rod is fixedly connected to a meshing gear B, the meshing gear B is provided with a meshing toothed rod B on the outside, and the meshing toothed rod B is fixedly connected to the heating barrel and the sliding base through the connecting frame A; when the sliding base drives the injection pipe B to be plugged into the inside of the injection pipe A by extending the advance and retreat hydraulic rod, the locking block can be slidably locked on the outside of the movable mold in the mold closing state.

[0014] The connecting member includes a fixing frame B fixedly connected to the outside of the fixed mold or the movable mold, a limiting frame fixedly connected to the outside of the fixed mold ejector rod group or the movable mold ejector rod group, and an abutting frame fixedly connected to the end of the fixed mold ejector rod group or the movable mold ejector rod group. The abutting frame outside the fixed mold is symmetrically fixedly connected to the outside of the connecting frame pushed and pulled by the movable mold, and the abutting frame outside the movable mold is squeezed by the inner side of the device base. By shortening the mold hydraulic rod, when the movable mold and the fixed mold are opened, the movable mold can use the connecting member to make the fixed mold ejector rod group and the movable mold ejector rod group close to each other for ejection and demolding.

[0015] A plastic molding method, using the above-mentioned plastic molding device, comprises the following steps:

[0016] Step 1: First, extend the mold hydraulic rod to close the movable mold and the fixed mold to form a molding cavity, and then extend the advance and retreat hydraulic rod to connect the injection pipe B with the injection pipe A. In this way, the connecting frame A can first drive the locking block to slide and lock on the outside of the movable mold in the mold closing state, and then the injection pipe B can be short-touched to touch the switch A and long-touched to touch the switch B. The short-touching of the switch A makes the release agent adhere to the inner wall of the molding cavity, and the long-touching of the switch B makes the sealing ring plate retract into the sealing slide groove;

[0017] Step 2: After the injection molding pipe B completely enters the injection molding pipe A, start the push motor to make the push screw rotate to push the melt into the front end of the heating barrel and the front end of the injection nozzle, and then extend the injection molding hydraulic rod to make the injection nozzle and the push screw move forward inside the heating barrel for injection molding, so that the melt enters the molding cavity through the injection molding pipe A. During the injection molding process, water is continuously supplied to the cooling pipe group to cool the melt inside the molding cavity to assist in the molding of the part. After the injection molding is completed, the injection molding hydraulic rod stops extending to make the injection molding nozzle and the push screw stop and maintain pressure;

[0018] Step 3: After the workpiece inside the molding cavity is cooled and formed, shorten the advance and retreat hydraulic rod to separate the injection pipe B from the inside of the injection pipe A, and then start the push motor and shorten the injection hydraulic rod to make the injection nozzle and the push screw rotate and retreat to perform backward loading;

[0019] Step 4: After the injection molding mechanism is reset, shorten the mold hydraulic rod to open the movable mold and the fixed mold, so that the fixed mold ejector rod group first extends out of the fixed mold for ejection and demolding, and then the movable mold ejector rod group extends out of the movable mold for ejection and demolding, so that the injection molding of the part can be completed.

[0020] The present invention has the following beneficial effects:

[0021] 1. The present invention extends the hydraulic rod to connect the injection pipe B with the injection pipe A so that before injection molding, the injection pipe B can short-touch the switch A to first allow the release agent inside the sealed material box to enter the molding cavity through the release agent pipe and the injection pipe A and fill the molding cavity, and then reset the push piston to generate suction inside the release agent pipe and suck the release agent inside the molding cavity into the sealed material box, so that the inner wall of the molding cavity is adhered to the release agent, that is, the present invention can autonomously add the release agent to the inside of the molding cavity before injection molding to reduce the demoulding resistance and avoid damage to the product caused by subsequent demoulding.

[0022] 2. The present invention extends the hydraulic rod to allow the injection pipe B to be internally plugged into the injection pipe A before injection molding. The symmetrical connecting frame A can drive the two symmetrical locking blocks to slide and lock on the outside of the movable mold in the mold closing state through the meshing gear rod B, the meshing gear B, the damping rod, the meshing gear A and the meshing gear rod A. At this time, the unlocking direction of the two symmetrical locking blocks is opposite to the opening direction of the movable mold, so as to prevent the mold hydraulic rod from independently resisting the opening force in the subsequent injection molding and pressure holding stages and maintaining the closing force applied to the movable mold, that is, it can prevent the expansion of the mold in the mold closing state from causing flash on the product.

[0023] 3. The present invention shortens the hydraulic rod of the mold to open the mold, so that the fixed mold ejector rod group can be extended out of the fixed mold first and then the movable mold ejector rod group can be extended out of the movable mold for demolding. That is, the workpiece attached to the fixed mold can be ejected and demolded by the extended fixed mold ejector rod group, and the movable mold ejector rod group can be ejected empty. The workpiece attached to the movable mold can be ejected and demolded by the extended movable mold ejector rod group, and the fixed mold ejector rod group can be ejected empty. That is, autonomous demolding can be performed during the mold opening process, and the double-sided ejector mold can be prevented from affecting the appearance of the workpiece during the demolding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of a plastic molding device proposed by the present invention;

[0025] Figure 2This is a first structural schematic diagram of Embodiment 1 of the present invention;

[0026] Figure 3 for Figure 2 A schematic diagram of the structure enlargement in the middle;

[0027] Figure 4 It is a second structural schematic diagram of the first embodiment of the present invention;

[0028] Figure 5 for Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0029] Figure 6 for Figure 4 A magnified schematic diagram of the structure at C in the middle;

[0030] Figure 7 It is a third structural schematic diagram of the first embodiment of the present invention;

[0031] Figure 8 for Figure 6 A magnified schematic diagram of the structure at D in the middle;

[0032] Fig. 9 This is a first structural diagram of Embodiment 2 of the present invention;

[0033] Fig.10 for Fig. 9 The enlarged schematic diagram of the structure at E in the middle;

[0034] Fig.11 This is a second structural diagram of Embodiment 2 of the present invention;

[0035] Fig.12 for Fig.11 The enlarged schematic diagram of the structure at F in the middle;

[0036] Fig.13 This is a first structural diagram of Embodiment 3 of the present invention;

[0037] Fig.14 This is a second structural diagram of Embodiment 3 of the present invention.

[0038] In the figure: 1. Device base; 2. Fixed mold; 3. Moving mold; 4. Injection mechanism; 401. Heating barrel; 402. Injection pipe B; 4021. Through slot; 4022. Outer biased abutment plate; 4023. Abutment slot; 403. Advance and retreat hydraulic rod; 404. Sliding base; 405. Hopper; 406. Injection hydraulic rod; 407. Pushing motor; 408. Pushing screw; 409. Injection nozzle; 5. Molding cavity; 6. Injection pipe A; 7. Adding mechanism; 701. Sealing box; 702. Release agent pipeline; 703. Refilling box; 704. Pushing piston; 705. Refilling pipe; 706. Docking slot; 707. Sealing ring plate; 708. Inner biased sealing plate; 709. Electromagnet block A; 7 10. Connecting iron block A; 711. Return spring group A; 712. One-way valve; 713. Sealing slide; 714. Electromagnetic iron block B; 715. Connecting iron block B; 716. Return spring group B; 717. Touch switch A; 718. Touch switch B; 8. Locking mechanism; 801. Locking block; 802. Fixed frame A; 803. Damping rod; 804. Engaging gear rod A; 805. Engaging gear A; 806. Engaging gear B; 807. Engaging gear rod B; 808. Connecting frame A; 9. Fixed mold ejector rod group; 10. Moving mold ejector rod group; 11. Connecting piece; 111. Fixed frame B; 112. Limiting frame; 113. Abutting frame; 114. Connecting frame B; 12. Mold hydraulic rod; 13. Cooling pipe group. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1

[0041] like Figure 1-Figure 8As shown, a plastic molding device proposed by the present invention comprises a device base 1, a fixed mold 2, a movable mold 3 and an injection molding mechanism 4 arranged on the top of the device base 1, the fixed mold 2 is fixedly connected to the top of the device base 1, the movable mold 3 is slidably connected to the top of the device base 1, a mold hydraulic rod 12 is arranged outside the movable mold 3, and a cooling pipe group 13 is arranged inside the fixed mold 2 and the movable mold 3, and the inside of the cooling pipe group 13 can continuously flow water through a water pump to achieve the purpose of cooling the workpiece inside the molding cavity 5 to assist molding, the fixed mold 2 and the movable mold 3 are molded together to form the molding cavity 5, an injection molding pipe A6 is arranged on the side of the fixed mold 2 away from the movable mold 3, the injection molding mechanism 4 comprises an injection molding pipe B402 fixedly connected to the outside of the heating barrel 401, the injection molding pipe B402 can be tightly plugged into the inside of the injection molding pipe A6, and the outside of the heating barrel 401 is provided with a heating material for heating and melting the granular plastic inside the heating barrel 401 into a viscous melt;

[0042] The injection molding mechanism 4 also includes an advance and retreat hydraulic rod 403 installed on the inner side of the device base 1 and a sliding base 404 slidably connected to the top of the device base 1. The output end of the advance and retreat hydraulic rod 403 is fixedly connected to the sliding base 404. The heating barrel 401 is fixedly connected to the top of the sliding base 404. A hopper 405 is arranged on the top of the heating barrel 401. The sliding base 404 can drive the injection molding pipe B402 to be plugged in or out of the injection molding pipe A6 by telescoping the advance and retreat hydraulic rod 403. The inner side of the sliding base 404 is installed with an injection molding hydraulic rod 406. The output end of the hydraulic rod 406 is fixedly connected to a push motor 407, the output shaft of the push motor 407 extends to the inside of the heating barrel 401 and is fixedly connected to a push screw 408, and the end of the push screw 408 is provided with an injection nozzle 409. By starting the push motor 407, the push screw 408 can push the granular plastic dropped from the inside of the hopper 405 into the heating zone for heating, and by retracting the injection hydraulic rod 406, the injection nozzle 409 and the push screw 408 can be moved forward for injection molding, stopped for pressure maintenance, and moved backward for loading in the heating barrel 401;

[0043] The interior of the fixed mold 2 is provided with an adding mechanism 7 for adding a mold release agent to the interior of the molding cavity 5 through the injection molding pipe A6. The adding mechanism 7 includes a sealed material box 701 embedded in the interior of the fixed mold 2, a mold release agent pipe 702 fixedly connected to the bottom of the sealed material box 701, and a feeding material box 703 fixedly connected to the top of the fixed mold 2. A pushing piston 704 is provided inside the sealed material box 701. A feeding pipe 705 is fixedly connected between the sealed material box 701 and the feeding material box 703. The outside of the feeding pipe 705 is provided with a feeding piston 704. A one-way valve 712 is provided, and the release agent in the feeding box 703 can enter the sealed box 701 through the feeding pipe 705 for feeding. A docking groove 706 is provided at the connection between the release agent pipeline 702 and the injection pipeline A6. A sealing ring plate 707 and an inner-biased sealing plate 708 are provided inside the docking groove 706. A sealing slide groove 713 is connected to the bottom of the docking groove 706. The sealing ring plate 707 is slidably connected to the inside of the sealing slide groove 713, and the inner-biased sealing plate 708 can only be deflected inwards.

[0044] The inner side of the sealed material box 701 and the outer side of the push piston 704 are respectively installed with an electromagnet block A709 and an iron connecting block A710 in opposite positions. The electromagnet block A709 is energized to attract the iron connecting block A710. When the electromagnet block A709 is energized, the push piston 704 can squeeze the release agent inside the sealed material box 701 into the release agent pipeline 702. The release agent entering the release agent pipeline 702 enters the interior of the molding cavity 5 through the injection pipeline A6. A reset spring group A711 is fixedly connected between the push piston 704 and the sealed material box 701. When the electromagnet block A709 is de-energized, the reset spring group A711 can drive the push piston 704 to push the release agent into the release agent pipeline 702. The material piston 704 is reset, so that the demoulding agent pipe 702 sucks the demoulding agent inside the molding cavity 5 into the inside of the sealed material box 701. The inside of the sealing slide groove 713 and the bottom of the sealing ring plate 707 are respectively installed with an electromagnet block B714 and a connecting iron block B715 in opposite positions. When the electromagnet block B714 is energized, the sealing ring plate 707 can enter the inside of the sealing slide groove 713 and no longer abut against the inner biased sealing plate 708. A reset spring group B716 is fixedly connected between the sealing ring plate 707 and the sealing slide groove 713. When the electromagnet block B714 is de-energized, the reset spring group B716 can drive the sealing ring plate 707 to reset.

[0045] A touch switch A717 connected to the power circuit of the electromagnet block A709 and a touch switch B718 connected to the power circuit of the electromagnet block B714 are installed on the inner side of the injection molding pipe A6. A through groove 4021 is provided on the outer side of the injection molding pipe B402. An outer biased abutment plate 4022 is provided inside the through groove 4021. An abutment groove 4023 is also provided on the outer side of the injection molding pipe B402. When the injection molding pipe B402 is inserted into the interior of the injection molding pipe A6, the touch switch A717 can be short-touched and the touch switch B718 can be long-touched, so that the release agent enters the interior of the molding cavity 5 and the injection molding pipe A6 is opened.

[0046] In this embodiment: first, the mold hydraulic rod 12 is extended to close the movable mold 3 and the fixed mold 2 to form a molding cavity 5, and then the sliding base 404 drives the injection molding pipe B402 to be plugged into the inside of the injection molding pipe A6 by extending the advance and retreat hydraulic rod 403. During this process, the injection molding pipe B402 can short-touch the touch switch A717 and long-touch the touch switch B718. During the short-touch touch switch A717, the outer biased abutment plate 4022 that follows the injection molding pipe B402 into the injection molding pipe A6 abuts against the touch switch. The switch A717 makes the electromagnet block A709 energized, and the electromagnet block A709 energized attracts the connecting iron block A710 and drives the pushing piston 704 to compress the return spring group A711, so that the release agent inside the sealed material box 701 is squeezed into the release agent pipeline 702, and the release agent inside the release agent pipeline 702 enters the molding cavity 5 through the injection pipeline A6 and fills the molding cavity 5. When the switch A717 is triggered, it is separated from the outer biased contact plate 4022 and enters the interior of the groove 4021. The electromagnet block A 709 is powered off, so that the compressed return spring group A711 drives the push piston 704 to reset. Since the sealing ring plate 707 is in contact with the inner biased sealing plate 708, the end of the injection pipe A6 away from the molding cavity 5 is blocked. Therefore, the reset push piston 704 can generate suction inside the release agent pipe 702 and suck the release agent inside the molding cavity 5 into the sealed material box 701, so that the inner wall of the molding cavity 5 is adhered to the release agent. At the same time, the release agent inside the feeding box 703 is discharged through the feeding pipe 705. Enter the sealed material box 701 to fill the material, so that the release agent inside the cavity 5 can be added. In the process of long-touch trigger switch B718, the electromagnet block B714 is energized to make the sealing ring plate 707 enter the sealing slide groove 713 and compress the reset spring group B716, so that the sealing ring plate 707 no longer abuts against the inner biased sealing plate 708, and follows the injection pipe B402 to enter the abutment groove 4023 inside the injection pipe A6 to abut against the inner biased sealing plate 708 to block the release agent pipe 702;

[0047] After the injection molding pipe B402 completely enters the interior of the injection molding pipe A6, and the push motor 407 rotates to make the push screw 408 rotate to push the melt into the front end of the heating barrel 401 and the front end of the injection nozzle 409, the injection molding hydraulic rod 406 is extended to make the injection nozzle 409 and the push screw 408 move forward in the heating barrel 401 to perform high-pressure and high-speed injection molding, so that the melt enters the interior of the molding cavity 5 through the injection molding pipe A6. After the injection molding is completed, the injection molding hydraulic rod 406 stops extending to make the injection nozzle 409 and the push screw 408 stop and maintain pressure, and at the same time, water is continuously introduced into the cooling pipe group 13 to cool the melt in the molding cavity 5 to assist in the molding of the product;

[0048] After the workpiece inside the molding cavity 5 is cooled and formed, the sliding base 404 drives the injection pipe B402 to be separated from the inside of the injection pipe A6 by shortening the advance and retreat hydraulic rod 403, and then the injection nozzle 409 and the push screw 408 are rotated and retreated by starting the push motor 407 and shortening the injection hydraulic rod 406 to perform backward loading, and then the mold hydraulic rod 12 is shortened to open the movable mold 3 and the fixed mold 2, and the subsequent demolding can be performed to perform the injection molding of the next workpiece;

[0049] Before injection molding, the plastic molding device can autonomously add a mold release agent into the interior of the molding cavity 5 to reduce the mold release resistance and avoid damage to the product caused by subsequent mold release.

[0050] Embodiment 2

[0051] like Figure 1 and Figure 9-12 As shown, based on the first embodiment, two locking mechanisms 8 for locking the movable mold 3 are symmetrically arranged outside the device base 1, and the locking mechanism 8 includes a locking block 801 symmetrically slidably connected to the top of the device base 1, and the locking block 801 can be locked on the outer side of the movable mold 3 in the mold closing state to prevent the mold hydraulic rod 12 from maintaining the closing force applied to the movable mold 3 alone;

[0052] The clamping mechanism 8 also includes a fixing frame A802 fixedly connected to the top of the device base 1 and a damping rod 803 that rotates at the top of the device base 1 in a damping manner. The fixing frame A802 is symmetrically slidably connected to the outside of a meshing toothed rod A804 fixedly connected to the locking block 801. The damping rod 803 is symmetrically fixedly connected to the outside of a meshing gear A805 meshing with the meshing toothed rod A804. The middle of the damping rod 803 is fixedly connected to a meshing gear B806. The outside of B806 is provided with an engaging gear rod B807, which is fixedly connected to the heating barrel 401 and the sliding base 404 through the connecting frame A808. When the sliding base 404 drives the injection pipe B402 to be plugged into the inside of the injection pipe A6 by extending the advance and retreat hydraulic rod 403, the connecting frame A808 can drive the engaging gear rod B807 to move, so that the locking block 801 can slide and lock on the outside of the movable mold 3 in the mold closing state.

[0053] In this embodiment: by extending the hydraulic rod 403 to advance and retreat so that the sliding base 404 drives the injection pipe B402 to be plugged into the inside of the injection pipe A6, the symmetrical connecting frame A808 that moves with the heating barrel 401 and the sliding base 404 can drive the meshing gear rod B807 to move, so that the two symmetrical meshing gears B806 rotate and drive the two symmetrical meshing gears A805 to rotate through the symmetrical damping rod 803, so that the two symmetrical meshing gear rods A804 slide outside the fixed frame A802 and drive the two symmetrical locking blocks 801 to slide and lock on the outside of the movable mold 3 in the mold closing state, so as to prevent the mold hydraulic rod 12 from independently resisting the mold stretching force in the subsequent injection and pressure holding stages and maintaining the closing force applied to the movable mold 3;

[0054] Before injection molding, the plastic molding device can drive two symmetrical locking blocks 801 to slide and lock on the outer side of the movable mold 3 in the mold closing state, so as to prevent the mold hydraulic rod 12 from independently resisting the mold stretching force in the subsequent injection molding and pressure holding stages and maintaining the closing force applied to the movable mold 3, that is, it can prevent the expansion of the mold in the mold closing state from causing flash on the product.

[0055] Embodiment 3

[0056] like Figure 1 and Figure 13-14 As shown, based on the first and second embodiments, a fixed mold ejector rod group 9 and a movable mold ejector rod group 10 are respectively provided inside the fixed mold 2 and the movable mold 3, and the fixed mold ejector rod group 9 and the movable mold ejector rod group 10 move in a direction close to each other to realize ejection and demoulding;

[0057] The fixed mold ejector rod group 9 and the movable mold ejector rod group 10 are both provided with connecting parts 11 on the outside. The connecting parts 11 include a fixing frame B111 fixedly connected to the outside of the fixed mold 2 or the movable mold 3, a limiting frame 112 fixedly connected to the outside of the fixed mold ejector rod group 9 or the movable mold ejector rod group 10, and a contact frame 113 fixedly connected to the end of the fixed mold ejector rod group 9 or the movable mold ejector rod group 10. When the limiting frame 112 contacts the fixing frame B111, the injection tension during the injection molding process can be avoided. The fixed mold ejector pin group 9 or the movable mold ejector pin group 10 retreats, thus affecting the molding quality of the product. The abutment frame 113 outside the fixed mold 2 is symmetrically fixedly connected to the connecting frame B114 pushed and pulled by the movable mold 3. The abutment frame 113 outside the movable mold 3 is squeezed by the inner side of the device base 1. By shortening the mold hydraulic rod 12, when the movable mold 3 and the fixed mold 2 are opened, the movable mold 3 can make the fixed mold ejector pin group 9 and the movable mold ejector pin group 10 close to each other through the connecting piece 11 for ejection and demolding.

[0058] In this embodiment: by shortening the mold hydraulic rod 12, when the movable mold 3 and the fixed mold 2 are opened, the movable mold 3 drives the external connecting piece 11 away from the fixed mold 2 and abuts against the connecting frame B114 outside the fixed mold 2, so that the connecting frame B114 drives the fixed mold ejector rod group 9 to extend out of the fixed mold 2 through the abutting frame 113, and when the movable mold 3 drives the external abutting frame 113 to squeeze with the inner side of the device base 1, the external abutting frame 113 can drive the movable mold ejector rod group 10 to extend out of the movable mold 3, that is, in the process of opening the mold, the fixed mold ejector rod group 9 can be extended out of the fixed mold 2 first, and then the movable mold ejector rod group 10 can be extended out of the movable mold 3 for demolding;

[0059] When the plastic molding device is opening the mold, the workpiece attached to the fixed mold 2 can be ejected and demolded by the extended fixed mold ejector group 9, and the movable mold ejector group 10 performs empty ejection. The workpiece attached to the movable mold 3 can be ejected and demolded by the extended movable mold ejector group 10, and the fixed mold ejector group 9 performs empty ejection. That is, the mold can be demolded independently during the mold opening process, and the double-sided ejector can be prevented from affecting the appearance of the workpiece during the demolding process.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plastic molding device, comprising a device base (1), a fixed mold (2) arranged on the top of the device base (1), a movable mold (3) and an injection molding mechanism (4), characterized in that: The fixed mold (2) and the movable mold (3) are molded together to form a molding cavity (5), an injection molding pipe A (6) is provided on the side of the fixed mold (2) away from the movable mold (3), and an adding mechanism (7) is provided inside the fixed mold (2) for adding a mold release agent to the inside of the molding cavity (5) through the injection molding pipe A (6), the adding mechanism (7) comprises a sealed material box (701) embedded in the fixed mold (2), a mold release agent pipe (702) fixedly connected to the bottom of the sealed material box (701), and a feeding material box (703) fixedly connected to the top of the fixed mold (2), the sealed material box (701) is provided with a pushing piston (704) inside, a feeding pipe (705) is fixedly connected between the sealing material box (701) and the feeding material box (703), a docking groove (706) is provided at the connection point between the release agent pipeline (702) and the injection pipeline A (6), a sealing ring plate (707) and an inner bias sealing plate (708) are provided inside the docking groove (706), and the injection molding mechanism (4) includes an injection molding pipeline B (402) fixedly connected to the outside of the heating barrel (401), and the injection molding pipeline B (402) can be tightly inserted into the injection molding pipeline A (6); Two mold locking mechanisms (8) for locking the movable mold (3) are symmetrically arranged outside the device base (1), and the mold locking mechanisms (8) include locking blocks (801) symmetrically slidably connected above the device base (1); A fixed mold ejector rod group (9) and a movable mold ejector rod group (10) are respectively arranged inside the fixed mold (2) and the movable mold (3), and a connecting piece (11) is arranged outside the fixed mold ejector rod group (9) and the movable mold ejector rod group (10); A mold hydraulic rod (12) is arranged outside the movable mold (3), and cooling pipeline groups (13) are arranged inside the fixed mold (2) and the movable mold (3); The injection molding mechanism (4) further comprises an advance and retreat hydraulic rod (403) mounted on the inner side of the device base (1) and a sliding base (404) slidably connected to the top of the device base (1); the output end of the advance and retreat hydraulic rod (403) is fixedly connected to the sliding base (404); the heating barrel (401) is fixedly connected to the top of the sliding base (404); a hopper (405) is arranged on the top of the heating barrel (401); an injection molding hydraulic rod (406) is mounted on the inner side of the sliding base (404); the output end of the injection molding hydraulic rod (406) is fixedly connected to a push motor (407); the output shaft of the push motor (407) is fixedly connected to a push screw (408); and an injection molding nozzle (409) is arranged at the end of the push screw (408); The inner side of the sealed material box (701) and the outer side of the pushing piston (704) are respectively installed with an electromagnet block A (709) and an iron connecting block A (710) in opposite positions; the bottom of the docking groove (706) is connected with a sealed slide groove (713); the sealing ring plate (707) is slidably connected to the inside of the sealed slide groove (713); the inside of the sealed slide groove (713) and the bottom of the sealing ring plate (707) are respectively installed with an electromagnet block B (714) and an iron connecting block B (715) in opposite positions; A touch switch A (717) connected to the power circuit of the electromagnet block A (709) and a touch switch B (718) connected to the power circuit of the electromagnet block B (714) are installed on the inner side of the injection molding pipe A (6); a through groove (4021) is provided on the outer side of the injection molding pipe B (402); an outer biased abutment plate (4022) is provided inside the through groove (4021); and an abutment groove (4023) is also provided on the outer side of the injection molding pipe B (402).

2. A plastic molding device according to claim 1, characterized in that: The electromagnet block A (709) is energized to adsorb the connecting iron block A (710); a return spring group A (711) is fixedly connected between the pushing piston (704) and the sealed material box (701); and a one-way valve (712) is arranged outside the feeding pipe (705); A return spring assembly B (716) is fixedly connected between the sealing ring plate (707) and the sealing sliding groove (713).

3. A plastic molding device according to claim 1, characterized in that: The clamping mechanism (8) further comprises a fixing frame A (802) fixedly connected to the top of the device base (1) and a damping rod (803) which is rotated in a damping manner at the top of the device base (1); the fixing frame A (802) is symmetrically and slidably connected to a meshing toothed rod A (804) fixedly connected to the locking block (801) on the outside; the damping rod (803) is symmetrically and fixedly connected to a meshing gear A (805) meshing with the meshing toothed rod A (804) on the outside; a meshing gear B (806) is fixedly connected to the middle of the damping rod (803); a meshing toothed rod B (807) is arranged on the outside of the meshing gear B (806); and the meshing toothed rod B (807) is fixedly connected to the heating barrel (401) and the sliding base (404) via a connecting frame A (808).

4. A plastic molding device according to claim 3, characterized in that: The connecting member (11) comprises a fixing frame B (111) fixedly connected to the outside of the fixed mold (2) or the movable mold (3), a limiting frame (112) fixedly connected to the outside of the fixed mold ejector rod group (9) or the movable mold ejector rod group (10), and an abutting frame (113) fixedly connected to the end of the fixed mold ejector rod group (9) or the movable mold ejector rod group (10), the abutting frame (113) outside the fixed mold (2) is symmetrically fixedly connected to the outside with a connecting frame B (114) pushed and pulled by the movable mold (3), and the abutting frame (113) outside the movable mold (3) is squeezed by the inner side of the device base (1).

5. A plastic molding method, using a plastic molding device according to claim 4, characterized in that: The following steps are involved: Step 1: First, extend the mold hydraulic rod (12) so that the movable mold (3) and the fixed mold (2) are molded together to form a molding cavity (5), and then extend the advance and retreat hydraulic rod (403) so that the injection pipe B (402) is plugged into the injection pipe A (6), and first the connecting frame A (808) drives the locking block (801) to slide and lock on the outer side of the movable mold (3) in the mold-closing state, and then the injection pipe B (402) is made to short-touch the touch switch A (717) and long-touch the touch switch B (718), the touch switch A (717) is short-touched so that the inner wall of the molding cavity (5) adheres to the mold release agent, and the touch switch B (718) is long-touched so that the sealing ring plate (707) is retracted into the sealing slide groove (713); Step 2: After the injection molding pipe B (402) completely enters the injection molding pipe A (6), the push motor (407) is started to rotate the push screw (408) to push the melt into the front end of the heating barrel (401) and the front end of the injection nozzle (409), and then the injection molding hydraulic rod (406) is extended to make the injection nozzle (409) and the push screw (408) move forward inside the heating barrel (401) for injection molding, so that the melt passes through the injection molding pipe A (6) and enters the molding cavity (5). During the injection molding process, water is continuously supplied to the cooling pipe group (13) to cool the melt inside the molding cavity (5) to assist in the molding of the product. After the injection molding is completed, the injection molding hydraulic rod (406) stops extending to make the injection nozzle (409) and the push screw (408) stop and maintain pressure; Step 3: After the workpiece inside the molding cavity (5) is cooled and formed, the advance and retreat hydraulic rod (403) is shortened to separate the injection pipe B (402) from the inside of the injection pipe A (6), and then the push motor (407) is started and the injection hydraulic rod (406) is shortened, so that the injection nozzle (409) and the push screw (408) rotate and retreat to perform backward loading; Step 4: After the injection molding mechanism (4) is reset, the mold hydraulic rod (12) is shortened to open the movable mold (3) and the fixed mold (2), so that the fixed mold ejector rod assembly (9) first extends out of the fixed mold (2) to eject and demould, and then the movable mold ejector rod assembly (10) extends out of the movable mold (3) to eject and demould, thereby completing the injection molding of the product.

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