A cold runner microporous injection molding mold and micro-mold opening method thereof

Abstract

A cold runner microporous injection molding mold includes a support plate, a flow channel floating block, an ejection assembly, a floating flow channel, a fixed mold plate embedded with a cavity insert, and a movable mold plate embedded with a core insert. When the fixed mold plate and the movable mold plate are closed, two or more mold cavities are formed between the cavity insert and the core insert; the movable mold plate and the flow channel floating block are both located between the support plate and the fixed mold plate, the movable mold plate is fixedly connected to the support plate, the flow channel floating block is slidably connected to the support plate, and an elastic element is connected between the flow channel floating block and the support plate. The floating flow channel includes a main flow channel and a branch flow channel. The main flow channel passes through the fixed mold plate, and the main flow channel is connected to the mold cavity through the branch flow channel. The branch flow channel is located between the flow channel floating block and the cavity insert. It also relates to a micro-mold opening method for a cold runner microporous injection molding mold, which uses the above mold. The present invention can avoid the problem of material leakage when using a two-plate mold in the case of a multi-cavity mold through the design of a floating flow channel, and can smoothly perform micro-mold opening, belonging to the field of molding mold technology.

Description

Technical Field

[0001] The invention relates to the technical field of molding molds, and in particular to a cold runner microporous injection molding mold and a micro-mold opening method thereof. Background Art

[0002] The injection preparation technology of foam plastics can be divided into two categories: chemical injection molding foaming and physical injection molding foaming according to the different pore-forming agents.

[0003] Among them, the chemical foaming technology pre-mixes the foaming agent with the material in a certain proportion, and injects it into the mold cavity after being melted and plasticized by the screw. The foaming agent decomposes under heat to release gas, thus forming a porous structure. Physical foaming molding uses gas as a pore-forming agent for foaming. Taking the Mucell technology, which is currently the most widely used commercial technology, as an example, nitrogen or carbon dioxide in a supercritical state is injected into the front and rear check valves of a special plasticizing screw through a gas injection device. Through the plasticization of the screw, it is evenly mixed with the plastic melt to form a gas-rich melt, which is finally injected into the mold cavity. The huge pressure drop during the injection process increases the thermodynamic instability of the system, thereby inducing the nucleation and growth of the foam cells. Because the bubble size of the final product is smaller and the density is higher, it is also called microporous injection molding technology.

[0004] Microcellular injection molding technology uses green and environmentally friendly gas as a pore-forming agent, which is environmentally friendly; there is no need for a pressure holding process, which shortens the molding cycle; the foaming of the melt can compensate for shrinkage, and the product has good dimensional stability and high precision; the addition of supercritical fluid can reduce the melt viscosity and significantly reduce the injection pressure. Therefore, microcellular injection molding is a highly promising injection foaming technology.

[0005] There are two commonly used microporous injection molding processes, namely the short-shot method and the micro-opening method. The short-shot method only fills the mold cavity with a certain proportion during the filling stage, but does not fill the mold cavity completely. This method is simple and easy to implement, but the product uniformity is poor and it is difficult to form complex structural parts. The micro-opening method first fills the mold cavity during the filling stage, and then slightly opens the mold to expand the mold cavity to provide the space required for physical foaming. The products produced by this method have good uniformity and are easy to control the foaming ratio. It is currently the most commonly used technology in the industry.

[0006] However, the micro-opening method is more suitable for hot runner microporous foaming molds and three-plate cold runner microporous foaming molds. Since the runners of these molds are isolated from the parting surface of the mold cavity, the retreat of the movable template during the micro-opening of the mold only expands the mold cavity without affecting the pouring system. However, hot runner microporous foaming molds and three-plate cold runner microporous foaming molds have more templates, complex processing design, and high cost. For parts with simpler structures and relatively smaller sizes, it is a more economical choice to use a two-plate cold runner mold and design it as a multi-cavity mold. However, two-plate molds are often used in traditional injection molding. Since the runner is designed on the parting surface of the mold cavity, the retreat of the movable template not only expands the mold cavity, but also causes the upper and lower surfaces of the runner to separate. At this time, the runner material has not solidified, and serious leakage will occur, polluting the mold, affecting continuous production, and limiting its application. Summary of the invention

[0007] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a cold runner microporous injection molding mold and a micro-mold opening method thereof, which can smoothly perform micro-mold opening under the cold runner design of a multi-cavity mold and a two-plate mold.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a cold runner microporous injection molding mold, comprising a support plate, a runner floating block, an ejection assembly, a floating runner, a fixed mold plate embedded with a cavity insert and a movable mold plate embedded with a core insert, two or more mold cavities are formed between the cavity insert and the core insert when the fixed mold plate and the movable mold plate are closed; the movable mold plate and the runner floating block are both located between the support plate and the fixed mold plate, the movable mold plate is rigidly connected to the support plate, the runner floating block is slidably connected to the support plate, and an elastic element is connected between the runner floating block and the support plate, the floating runner comprises a main runner and a branch runner, the main runner passes through the fixed mold plate, the main runner is connected to the mold cavity via the branch runner, and the branch runner is located between the runner floating block and the cavity insert; the ejection assembly is used to eject the runner condensate and the workpiece.

[0009] After adopting this structure, through the design of floating runner, as the design of two-plate mold cold runner microporous injection molding mold, the multi-cavity mold layout can still smoothly perform micro-opening. Micro-opening technology refers to the additional pre-opening of the mold after injection filling to provide foaming space for the part.

[0010] Since the device is provided with a floating runner, when the mold is slightly opened to expand the mold cavity to provide space for material foaming, the runner floating block elastically supports the side of the fixed mold plate, so that the runner, gate and cold material well are adaptively fitted to the side of the fixed mold plate, thereby meeting the requirements of micro-opening the mold while avoiding the problem of runner leakage when using a two-plate mold in the case of a multi-cavity mold.

[0011] As a preferred embodiment, the movable template and the runner floating block are both located behind the fixed template, a gate sleeve is provided in the main runner, the front end of the fixed template is fixedly connected to the mold working surface, a positioning ring is fixed on the mold working surface, the ejection assembly includes a needle plate and a push rod for ejecting the condensate and the workpiece, the rear end of the push rod is connected to the needle plate, the needle plate is located behind the support plate, and the rear end of the needle plate is fixedly connected to the mold working bottom.

[0012] As a preferred embodiment, a cold runner microporous injection molding mold also includes a runner fixing block, the elastic element is a spiral spring, the runner fixing block is fixedly connected to the support plate, the runner fixing block includes a runner fixing seat, one end of the spring is connected to the runner fixing seat, and the other end of the spring is connected to the runner floating block. When the fixed mold plate and the movable mold plate are closed, the elastic force direction of the spring on the runner floating block is toward the fixed mold plate.

[0013] As a preference, the flow channel fixing block further comprises a boss, one end of which is fixedly connected to the flow channel fixing seat, a spring is sleeved on the outside of the boss, a groove is formed on the flow channel floating block, and the other end of the boss can be slidably inserted into the groove.

[0014] As a preferred embodiment, a flow channel groove is opened on the surface of the flow channel floating block, a branch flow channel is formed between the flow channel groove and the cavity insert, the end of the main flow channel faces the flow channel groove, and a cold material well is provided at the bottom of the flow channel; the push rod includes a first push rod and a second push rod, the first push rod can slide through the support plate, the movable template and the core insert, the front end of the first push rod is located at the bottom of the mold cavity, the second push rod can slide through the support plate, the flow channel fixed block and the flow channel floating block, and the front end of the second push rod is located at the bottom of the cold material well; the needle plate includes a face needle plate and a bottom needle plate, the bottom of the face needle plate is provided with a plurality of mounting grooves, the rear end of the first push rod and the rear end of the second push rod are both embedded in the mounting groove, and the bottom needle plate is fixedly connected to the face needle plate and supports the opening of the mounting groove.

[0015] As a preferred embodiment, the material of the flow channel floating block includes aluminum alloy, and the materials of the flow channel fixed block, the movable mold plate and the fixed mold plate all include steel.

[0016] As a preferred embodiment, a cold runner microporous injection molding mold also includes a locking assembly and a locking control system. The locking assembly includes an exciter and a magnet. The magnet is fixed on the runner floating block, and the exciter is fixed on a corresponding position on the cavity insert. The locking control system is electrically connected to the exciter.

[0017] As a preferred embodiment, a cold runner microporous injection molding mold also includes a displacement sensor, which is a contact digital displacement sensor. A sensor support is fixed to the side of the fixed mold plate, and a contact seat is fixed to the side of the movable mold plate. The displacement sensor is installed on the sensor support. The displacement sensor includes a contact, and the contact faces the surface of the contact seat, so that the relative displacement between the movable mold plate and the fixed mold plate is measured by the displacement sensor.

[0018] A micro-mold opening method for a cold runner microporous injection molding mold, using the above-mentioned cold runner microporous injection molding mold, the cold runner microporous injection molding mold is installed on an all-electric injection molding machine;

[0019] During the filling stage, the flow channel floating block is tightly attached to the cavity insert under the elastic action of the elastic element, and the excitation body is energized to lock the locking assembly;

[0020] After the filling stage, the all-electric injection molding machine controls the rear template to move backward, driving the movable template, core insert and runner fixed block to move backward, so that the mold cavity is slightly opened. At this time, the runner floating block is adaptively close to the cavity insert under the action of the elastic element and the locking assembly.

[0021] After the part foams in the mold cavity and reaches the ejection temperature, the excitation magnet is powered off to release the locking assembly. The all-electric injection molding machine drives the moving mold plate, core insert, runner fixing block, support plate, needle plate and mold bottom to continue moving backward until they reach the designated mold opening position. The needle plate drives the push rod to move forward to eject the condensate and the part.

[0022] The microcellular injection molding uses physical pore-forming agents such as carbon dioxide and nitrogen in a supercritical state for foaming.

[0023] In general, the present invention has the following advantages:

[0024] (1) The floating runner, locking assembly and control method involved in the method of the present invention solve the problem of material leakage in the runner when a cold runner multi-cavity mold with a two-plate mold design is applied with a micro-opening process, thereby affecting continuous production.

[0025] (2) The inventive method can be applied to a multi-cavity mold structure, and the flow channel floating block and the flow channel fixed block can be freely designed according to the flow channel layout.

[0026] (3) The structure and method are simple and easy to implement, suitable for continuous production, and have high potential economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A cross-sectional view of a cold runner microporous injection molding mold during the filling stage.

[0028] Figure 2 This is a cross-sectional view of a cold runner microporous injection molding mold when it is slightly opened.

[0029] Figure 3 It is a three-dimensional diagram of the flow channel floating block.

[0030] Figure 4 It is a cross-sectional view of the cooperation between the flow channel floating block and the fixed template.

[0031] Figure 5 The figure is a flow chart of the mold control method.

[0032] Among them, 001 is the mold surface, 002 is the flow channel floating block, 003 is the positioning ring, 004 is the gate sleeve, 005 is the fixed plate, 006 is the cavity insert, 007 is the mold cavity, 008 is the core insert, 009 is the moving plate, 010 is the support plate, 011 is the surface needle plate, 012 is the bottom needle plate, 013 is the mold bottom, 014 is the push rod, 015 is the flow channel fixed block, 016 is the spring, and 017 is the displacement sensor. 101 is the magnet, 102 is the flow channel groove, 103 is the limit step, 104 is the avoidance gap, 201 is the injection molding machine control system, 202 is the locking control system, and 203 is the locking component. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0034] Embodiment 1

[0035] like Figure 1 to Figure 4 As shown, a cold runner microporous injection molding mold includes a support plate, a runner floating block, an ejection assembly, a floating runner, a fixed mold plate embedded with a cavity insert and a movable mold plate embedded with a core insert, two or more mold cavities are formed between the cavity insert and the core insert when the fixed mold plate and the movable mold plate are closed; the movable mold plate and the runner floating block are both located between the support plate and the fixed mold plate, the movable mold plate is rigidly connected to the support plate, the runner floating block is slidably connected to the support plate, and an elastic element is connected between the runner floating block and the support plate, the floating runner includes a main runner and a branch runner, the main runner passes through the fixed mold plate, the main runner is connected to the mold cavity through the branch runner, and the branch runner is located between the runner floating block and the cavity insert; the ejection assembly is used to eject the runner condensate and the workpiece.

[0036] The gate can be in the form of a side gate, or a fan gate, a latent gate, a thin film gate, or other gate forms used in two-plate molds.

[0037] The movable template and the runner floating block are both located behind the fixed template, a gate sleeve is provided in the main runner, the front end of the fixed template is fixedly connected to the mold working surface, a positioning ring is fixed on the mold working surface, the ejection assembly includes a needle plate and a push rod for ejecting the condensate and the workpiece, the rear end of the push rod is connected to the needle plate, the needle plate is located behind the support plate, and the rear end of the needle plate is fixedly connected to the mold working bottom.

[0038] The main channel can be in the form of a bushing or can be directly machined on the fixed template.

[0039] A cold runner microporous injection molding mold also includes a runner fixing block, the elastic element is a spiral spring, the runner fixing block is fixedly connected to the support plate, the runner fixing block includes a runner fixing seat, one end of the spring is connected to the runner fixing seat, and the other end of the spring is connected to the runner floating block. When the fixed mold plate and the movable mold plate are closed, the elastic force direction of the spring on the runner floating block is toward the fixed mold plate.

[0040] The flow channel fixing block also includes a convex column, one end of which is fixedly connected to the flow channel fixing seat, a spring sleeve is arranged on the outer side of the convex column, a groove is formed on the flow channel floating block, and the other end of the convex column can be slidably inserted into the groove.

[0041] The flow channel floating block is provided with a limiting step, so that the flow channel floating block and the movable template are matched through the step surface. The clearance gap generated when the limiting step and the movable template are matched limits the floating stroke of the floating flow channel block.

[0042] A flow channel groove is opened on the surface of the flow channel floating block, and a branch flow channel is formed between the flow channel groove and the cavity insert, the end of the main flow channel faces the flow channel groove, and a cold material well is provided at the bottom of the flow channel; the push rod includes a first push rod and a second push rod, the first push rod can slide through the support plate, the movable template and the core insert, the front end of the first push rod is located at the bottom of the mold cavity, the second push rod can slide through the support plate, the flow channel fixed block and the flow channel floating block, and the front end of the second push rod is located at the bottom of the cold material well; the needle plate includes a face needle plate and a bottom needle plate, and a plurality of mounting grooves are provided at the bottom of the face needle plate, the rear end of the first push rod and the rear end of the second push rod are both embedded in the mounting groove, and the bottom needle plate is fixedly connected to the face needle plate and supports the opening of the mounting groove.

[0043] The cold material well adopts a cone-shaped structure, and can also adopt a Z-shaped, spherical, and ring-groove-shaped structure.

[0044] The material of the flow channel floating block includes aluminum alloy, and the materials of the flow channel fixed block, the movable template and the fixed template all include steel.

[0045] Microporous injection molding can significantly reduce the injection pressure, so the flow channel floating block is made of aluminum alloy, while the moving and fixed templates are still made of mold steel.

[0046] The cold runner microporous injection molding mold is suitable for a standard mold frame and a fully electric injection molding machine capable of accurately controlling the position of a mold plate.

[0047] A cold runner microporous injection molding mold also includes a locking component and a locking control system. The locking component includes an exciter and a magnet. The magnet is fixed on the runner floating block, and the exciter is fixed on the corresponding position on the cavity insert. The locking control system is electrically connected to the exciter.

[0048] The exciter is used to excite the magnetic field and is used together with the receiving magnet to lock the device.

[0049] A cold runner microporous injection molding mold also includes a displacement sensor, which is a contact digital displacement sensor. A sensor support is fixed to the side of the fixed mold plate, and a contact seat is fixed to the side of the movable mold plate. The displacement sensor is installed on the sensor support. The displacement sensor includes a contact, and the contact faces the surface of the contact seat, so that the relative displacement between the movable mold plate and the fixed mold plate is measured by the displacement sensor.

[0050] The sensor support and the contact platform are fixed to the fixed template and the movable template respectively by bolts.

[0051] A micro-mold opening method for a cold runner microporous injection molding mold, using the above-mentioned cold runner microporous injection molding mold, the cold runner microporous injection molding mold is installed on an all-electric injection molding machine;

[0052] During the filling stage, the flow channel floating block is tightly attached to the cavity insert under the elastic action of the elastic element, and the excitation body is energized to lock the locking assembly;

[0053] After the filling stage, the all-electric injection molding machine controls the rear template to move backward, driving the movable template, core insert and runner fixed block to move backward, so that the mold cavity is slightly opened. At this time, the runner floating block is adaptively close to the cavity insert under the action of the elastic element and the locking assembly.

[0054] After the part foams in the mold cavity and reaches the ejection temperature, the excitation magnet is powered off to release the locking assembly. The all-electric injection molding machine drives the moving mold plate, core insert, runner fixing block, support plate, needle plate and mold bottom to continue moving backward until they reach the designated mold opening position. The needle plate drives the push rod to move forward to eject the condensate and the part.

[0055] The specific steps of the micro-mold opening method of the above-mentioned cold runner micro-porous injection molding mold are as follows.

[0056] 1) If Figure 1 As shown, during the filling stage, the mold is in a completely closed state, the locking device is locked, the movable template is fitted with the fixed template, the volume of the mold cavity is the original volume, and the runner floating block is forced to sink under the action of the clamping force to support the fixed template. At this time, the spring is in a compressed state.

[0057] 2) The filling stage continues, the various parts of the mold remain in their original state, and the spring and locking device make the runner floating block fit stably on the cavity insert.

[0058] 3) If Figure 2As shown, after the filling stage is over, the rear template of the injection molding machine retreats in the direction of the arrow, driving the movable template, core insert, runner fixing block, support plate, face needle plate, bottom needle plate and mold bottom to move backward, realizing a slight opening of the mold cavity. At this time, the volume of the mold cavity is expanded to an extended volume, and the runner floating block is still adaptively attached to the cavity insert due to the upward thrust of the spring and the action of the locking device. Therefore, the runner, gate and cold material well designed on the runner floating block still maintain the state before the slight opening of the mold, and no leakage will occur.

[0059] 4) After the part is foamed in the mold cavity and reaches the ejection temperature, the rear template of the injection molding machine continues to retreat in the direction of the arrow, while continuing to drive the movable template, core insert, runner fixing block, support plate, face needle plate, bottom needle plate and mold bottom to move backward, and the locking device is unlocked. During this process, the core insert is pulled out of the cavity insert, and the spring gradually stretches from the compressed state until it reaches the natural state. At this time, the runner floating block reaches the limit floating position, and then moves out with the rear template of the injection molding machine together with the movable template, core insert, runner fixing block, support plate, face needle plate, bottom needle plate and mold bottom. At the same time, the cold material well will bring out the casting system condensate. After the injection molding machine reaches the specified mold opening position, the needle plate drives the push rod to move in the opposite direction of the arrow to eject the casting system condensate and the part.

[0060] 5) After the part is ejected, the mold is closed again and process 1) is repeated to prepare for the next injection cycle.

[0061] like Figure 5 The control method of the present mold is shown in the figure. The arrows in the figure represent the transmission of electrical signals between the various components. After the mold is closed, the displacement sensor of the injection molding machine control system is in the initial position. The injection molding machine control system applies a first control signal to the locking control system. After the locking control system receives the control signal, it applies a second control signal to the locking assembly. The exciter on the cavity insert generates a magnetic field. The magnetic field attracts the floating runner block with a magnet to the cavity insert, ensuring that the gating system does not leak materials during the subsequent micro-opening process. After the filling stage is over, the injection molding machine control system drives the injection molding machine template to move slightly in the mold opening direction. The displacement sensor reads the micro-opening distance and feeds back the distance signal to the injection molding machine control system and the locking control system in real time. After the micro-opening, the displacement sensor is in the holding position. When the micro-opening holding stage is over, the injection molding machine control system drives the template to continue to move in the mold opening direction. When the locking control system reads that the position of the displacement sensor reaches the critical position, it sends a control signal to the electromagnetic device to disconnect the exciter circuit and release the floating runner block with a magnet. Subsequently, the floating runner mechanism reaches the maximum floating value, and the moving template retreats together, and the mold is opened.

[0062] The above embodiments are preferred implementation modes of the invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A cold runner microporous injection molding mold, characterized in that: It includes a support plate, a flow channel floating block, an ejector assembly, a floating flow channel, a fixed mold plate embedded with a cavity insert, and a movable mold plate embedded with a core insert. When the fixed mold plate and the movable mold plate are closed, two or more mold cavities are formed between the cavity insert and the core insert. The movable mold plate and the flow channel floating block are both located between the support plate and the fixed mold plate, the movable mold plate is rigidly connected to the support plate, the flow channel floating block is slidably connected to the support plate, and an elastic element is connected between the flow channel floating block and the support plate, the floating flow channel includes a main flow channel and a branch flow channel, the main flow channel passes through the fixed mold plate, the main flow channel is connected to the mold cavity through the branch flow channel, and the branch flow channel is located between the flow channel floating block and the cavity insert; A flow channel groove is provided on the surface of the flow channel floating block, and a branch flow channel is formed between the flow channel groove and the cavity insert; The ejector assembly is used to eject the runner condensate and the workpiece; It also includes a locking assembly and a locking control system. The locking assembly includes an exciter and a magnetized body. The magnetized body is fixed on the flow channel floating block, and the exciter is fixed on the corresponding position on the cavity insert. The locking control system is electrically connected to the exciter.

2. A cold runner microporous injection molding mold according to claim 1, characterized in that: The movable template and the runner floating block are both located behind the fixed template, a gate sleeve is provided in the main runner, the front end of the fixed template is fixedly connected to the mold working surface, a positioning ring is fixed on the mold working surface, the ejection assembly includes a needle plate and a push rod for ejecting the condensate and the workpiece, the rear end of the push rod is connected to the needle plate, the needle plate is located behind the support plate, and the rear end of the needle plate is fixedly connected to the mold working bottom.

3. A cold runner microporous injection molding mold according to claim 1, characterized in that: It also includes a flow channel fixing block, the elastic element is a spiral spring, the flow channel fixing block is fixedly connected to the support plate, the flow channel fixing block includes a flow channel fixing seat, one end of the spring is connected to the flow channel fixing seat, and the other end of the spring is connected to the flow channel floating block. When the fixed mold plate and the movable mold plate are closed, the elastic force direction of the spring on the flow channel floating block is toward the fixed mold plate.

4. A cold runner microporous injection molding mold according to claim 3, characterized in that: The flow channel fixing block also includes a convex column, one end of which is fixedly connected to the flow channel fixing seat, a spring sleeve is arranged on the outer side of the convex column, a groove is formed on the flow channel floating block, and the other end of the convex column can be slidably inserted into the groove.

5. A cold runner microporous injection molding mold according to claim 2, characterized in that: The end of the main channel faces the channel groove, and a cold material well is provided at the bottom of the channel groove; The push rod includes a first push rod and a second push rod. The first push rod can slide through the support plate, the movable mold plate and the core insert. The front end of the first push rod is located at the bottom of the mold cavity. The second push rod can slide through the support plate, the flow channel fixing block and the flow channel floating block. The rear end of the second push rod is located at the bottom of the cold material well. The needle plate includes a face needle plate and a bottom needle plate. The bottom of the face needle plate is provided with multiple mounting grooves. The rear end of the first push rod and the front end of the second push rod are both embedded in the mounting grooves. The bottom needle plate is fixedly connected to the face needle plate and supports the opening of the mounting groove.

6. A cold runner microporous injection molding mold according to claim 1, characterized in that: The material of the flow channel floating block includes aluminum alloy, and the material of the flow channel fixed block, the movable template and the fixed template includes steel.

7. A cold runner microporous injection molding mold according to claim 2, characterized in that: It also includes a displacement sensor, which is a contact digital displacement sensor. A sensor support is fixed on the side of the fixed template, and a contact platform is fixed on the side of the movable template. The displacement sensor is installed on the sensor support. The displacement sensor includes a contact, and the contact faces the surface of the contact platform, so that the relative displacement between the movable template and the fixed template is measured by the displacement sensor.

8. A micro-mold opening method for a cold runner microporous injection molding mold, using the cold runner microporous injection molding mold according to claim 7, characterized in that: The cold runner microporous injection molding mold is installed on an all-electric injection molding machine; During the filling stage, the flow channel floating block is tightly attached to the cavity insert under the elastic action of the elastic element, and the excitation body is energized to lock the locking assembly; After the filling stage, the all-electric injection molding machine controls the rear template to move backward, driving the movable template, core insert and runner fixed block to move backward, so that the mold cavity is slightly opened. At this time, the runner floating block is adaptively close to the cavity insert under the action of the elastic element and the locking assembly. After the part foams in the mold cavity and reaches the ejection temperature, the excitation magnet is powered off to release the locking assembly. The all-electric injection molding machine drives the moving mold plate, core insert, runner fixing block, support plate, needle plate and mold bottom to continue moving backward until they reach the designated mold opening position. The needle plate drives the push rod to move forward to eject the condensate and the part.

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