Injection molding machine

Abstract

The invention discloses an injection molding machine, belongs to the technical field of plastic processing equipment, and provides an injection molding machine which is simpler in structure and faster in demolding, the injection molding machine comprises a base, the base is provided with a pipeline arrangement box, a hydraulic control box, an electric control box, an injection mechanism, a mold assembly, an air exhaust pressure storage mechanism and an injection cut-off mechanism, and the mold assembly comprises a fixed mold; one side of the fixed mold is fixedly connected with an injection mechanism, the other side of the fixed mold is fixedly connected with a mounting plate through a guide column, a mold opening and closing drive is arranged on the mounting plate, and the movable end of the mold opening and closing drive is connected with a movable mold. The air exhaust and pressure storage mechanism is arranged to be matched with the tail end cut-off assembly to vacuumize the interior of the mold cavity before injection, it is guaranteed that all tiny corners in the mold cavity can be filled with raw material liquid, high-pressure airflow is returned into the mold cavity after raw material forming and before mold splitting, a formed part can be separated from the mold cavity instantly at the moment of mold splitting of the movable mold and the fixed mold, and the mold cavity is prevented from being damaged. Not only is the demolding efficiency improved, but also the structural complexity of the whole injection molding machine is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of plastic processing equipment, and in particular to an injection molding machine. Background Art

[0002] Since air will remain in the mold cavity after mold closing, the air pressure in the mold cavity will increase during the pressurized injection process. Poor exhaust will form bubbles on the surface of the molded part, especially for flat molded parts with fine edge structures. The impact will be more obvious. Although the vacuum extraction method is used in the prior art to solve the problem of insufficient cavity filling, after mold separation, the air pressure between the outer side of the molded part and the inner wall of the mold cavity may still be lower than the atmospheric pressure, which is a negative pressure suction state. Therefore, it is necessary to set an ejection structure inside the mold body or an active gripping structure outside the mold body, which not only increases the structural complexity of the injection molding machine, but also the demolding efficiency will not be very high. Summary of the invention

[0003] The purpose of the present application is to provide an injection molding machine with a simpler structure and faster demoulding.

[0004] In order to achieve the above purpose, the present application provides an injection molding machine: comprising a base, on which a pipeline arrangement box, a hydraulic control box, an electric control box, an injection mechanism, a mold assembly, an air extraction and pressure storage mechanism, and an injection cut-off mechanism are arranged; the mold assembly comprises a fixed mold, one side of the fixed mold is fixedly connected to the injection mechanism, and the other side is fixedly connected to a mounting plate through a guide column; a split-and-close mold drive is arranged on the mounting plate, and the movable end of the split-and-close mold drive is connected to a movable mold, which is suitable for cooperating with the guide column to form a sliding pair; the fixed mold is provided with a first cavity on the side opposite to the movable mold, and the movable mold is provided with a first cavity on the side opposite to the fixed mold There is a second cavity, and a head end cut-off assembly is provided at the bottom of the fixed mold, which is suitable for controlling the on-off state of the first cavity and the inside of the injection mechanism. The air extraction and pressure storage mechanism includes an air extraction pump and a pressure storage tank. The air inlet end of the air extraction pump is connected with the inside of the second cavity through an air extraction pipe, and the exhaust end of the air extraction pump is connected with the pressure storage tank. The pressure storage tank is also connected with the air extraction pipe through an exhaust pipe. An electric-controlled ball valve is provided on the exhaust pipe. The bottom of the movable mold is provided with a tail end cut-off assembly, which is suitable for controlling the on-off state of the second cavity and the air extraction pipe, and can return the gas extracted from the mold cavity at a higher pressure.

[0005] Preferably, the injection mechanism comprises a storage compartment, the lower end of which is connected to a syringe, a push-pull rod is movably connected inside the syringe, one end of the push-pull rod located outside the syringe is connected to a rotary drive, and a telescopic drive is provided between the rotary drive and the fixed mold, so that the pressure change in the syringe can be more flexibly and controllable.

[0006] Preferably, the rotary driver comprises a traction frame, to which an electric motor and a reducer are fixedly connected, the main part of the push-pull rod is a screw, a piston is connected between the screw and the output end of the reducer, the main part of the injection cylinder is a storage barrel, the inner wall of the storage barrel is in close contact with the outer side surface of the piston, the end of the storage barrel has a shrinking ring, an optical axis is connected between the piston and the reducer, and is suitable for being inserted with the shrinking ring to form a sliding pair and a rotating pair, and a heating ring is provided on the outer side surface of the storage barrel for maintaining the molten state of the raw material in the storage barrel.

[0007] As a preferred embodiment, the main part of the storage compartment is an insulation bin, which is connected to the interior of the storage barrel through a feed pipe, an electric control valve is provided between the insulation bin and the feed pipe, and the telescopic drive includes a mounting frame fixedly connected to the fixed mold, a hydraulic cylinder is connected between the mounting frame and the traction frame, and is connected to the pipeline inside the hydraulic control box to obtain hydraulic power.

[0008] As a preferred embodiment, the upper surface of the base is fixedly connected to a frame, the insulation bin is fixedly connected to the frame, the frame is also fixedly connected to a pallet and a platform, the fixed mold is fixedly connected to the platform, the mounting plate is fixedly connected to the pallet, a clearance frame is also fixedly connected between the pallet and the platform, the base is provided with a feed opening passing through the upper and lower surfaces below the clearance frame, the pipeline layout box and the hydraulic control box are both located between the pallet and the base, and the electric control box is located above the pallet; a shell is also provided on the base, the shell includes a transparent cover for shielding the fixed mold and the movable mold, and a protective cover and an inspection cover for shielding the splitting and closing mold drive, so as to facilitate subsequent inspection and maintenance work.

[0009] Preferably, a sealing strip is fixedly connected to the side of the fixed mold facing the movable mold, the sealing strip surrounds the first cavity, a sealing groove is provided on the side of the movable mold facing the fixed mold, the sealing groove surrounds the second cavity, and the sealing strip is suitable for being embedded in the sealing groove and fitting tightly; a guide hole is provided in the movable mold, which is suitable for cooperating with the guide column to form a sliding pair to ensure the smooth movement of the movable mold.

[0010] As a preferred embodiment, a first slot is provided on the bottom surface of the fixed mold, a coarse channel connecting the first slot and the inside of the storage barrel is provided on the fixed mold, and a fine channel connecting the first cavity and the first slot is provided on the fixed mold; the head end truncation assembly includes a first electric telescopic rod connected to the base, the movable end of the first electric telescopic rod is connected to a first plug plate through a limit plate, which is suitable for being plugged into the first slot to form a sliding pair, and a tapered hole is provided on the first plug plate, and the two ends of the tapered hole are suitable for being aligned with the coarse channel and the fine channel respectively at the same time, so as to play the role of introducing and cutting off the raw materials.

[0011] As a preferred embodiment, a convection channel connected to the second cavity is provided on the side of the movable mold facing away from the fixed mold, and a second slot connected to the convection channel is provided on the bottom surface of the movable mold. The tail end truncation assembly includes a second electric telescopic rod connected to the bottom surface of the movable mold, and the movable end of the second electric telescopic rod is connected to a second plug plate through a traction plate, which is suitable for being plugged into the second slot to form a sliding pair. A convection flow hole is provided on the second plug plate, which is suitable for being aligned with the convection channel to form a complete airflow channel.

[0012] As a preferred embodiment, the electric control valve, the motor, the vacuum pump, the electric control ball valve, the first electric telescopic rod and the second electric telescopic rod are all electrically connected to the controller in the electric control box; the mold opening and closing drive is powered by a hydraulic system, and is connected to the pipeline in the hydraulic control box through the pipeline in the pipeline layout box, so as to well shield and protect the pipeline structure in the injection molding machine.

[0013] As a preferred embodiment, a one-way valve is further provided on the air extraction pipe, and the portion of the air extraction pipe located between the one-way valve and the movable mold is connected to the exhaust pipe to avoid reversal when the air extraction pump is shut down, thereby improving the safety of the use of the air extraction pump.

[0014] Compared with the prior art, the beneficial effects of this application are: (1) By setting up an air extraction and pressure storage mechanism, the vacuum in the mold cavity is evacuated in cooperation with the tail end cut-off component before injection, ensuring that the raw material liquid can fill every tiny corner in the mold cavity, reducing the defects of the molded parts. After the raw material is molded and before the mold is separated, a higher pressure airflow is returned to the mold cavity, so that a positive pressure greater than the external atmospheric pressure is formed between the molded part and the inner wall of the mold cavity. At the moment of separation between the movable mold and the fixed mold, the molded part will instantly separate from the mold cavity. There is no need to set up an additional demolding structure inside the mold body or a grabbing mechanism outside the mold body. This not only improves the demolding efficiency, but also reduces the structural complexity of the entire injection molding machine. (2) By setting a head-end cut-off component between the mold cavity and the injection mechanism, the raw materials entering the mold cavity can be completely isolated from the raw materials in the injection mechanism, avoiding the problem of wire drawing and adhesion during demoulding, further improving the demoulding effect, reducing the waste of raw materials, and avoiding the pollution of the injection molding machine by raw materials; (3) By configuring the push-pull rod with two types of drives, rotation and telescopic, the degree of freedom of the push-pull rod in the syringe is improved, making the pressure adjustment of the raw material in the syringe by the push-pull rod more flexible and controllable; (4) The design has a simple structure, is easy to use and maintain, has a reasonable layout of mechanisms and pipelines, good safety, and a high degree of automation, stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the first stereoscopic schematic diagram of the overall structure of the injection molding machine.

[0016] Figure 2 It is the second stereoscopic schematic diagram of the overall structure of the injection molding machine.

[0017] Figure 3 This is the first stereoscopic schematic diagram of the internal structure of the injection molding machine.

[0018] Figure 4 This is a second stereoscopic schematic diagram of the internal structure of the injection molding machine.

[0019] Figure 5 It is a schematic diagram of the first three-dimensional structure of the main part of the injection molding machine.

[0020] Figure 6 This is a schematic diagram of the second three-dimensional structure of the main part of the injection molding machine.

[0021] Figure 7 It is a schematic diagram of the three-dimensional structure of the movable mold and its matching parts of the injection molding machine.

[0022] Figure 8 It is a three-dimensional structural cross-sectional view of the movable mold of the injection molding machine and its matching parts.

[0023] Fig. 9 For the injection molding machine Figure 8 A partial enlarged view of point A.

[0024] Fig.10 It is a three-dimensional structural schematic diagram of the air extraction and pressure storage mechanism of the injection molding machine.

[0025] Fig.11 It is a schematic diagram of the three-dimensional structure of the tail end truncation component of the injection molding machine.

[0026] Fig.12 It is a three-dimensional structural cross-sectional view of the movable mold of the injection molding machine.

[0027] Fig.13 It is a first three-dimensional structural schematic diagram of the fixed mold and its matching parts of the injection molding machine.

[0028] Fig.14 This is a second three-dimensional structural schematic diagram of the fixed mold and its matching parts of the injection molding machine.

[0029] Fig.15 It is a three-dimensional structural sectional view of the injection cylinder and injection cut-off mechanism of the injection molding machine cooperating with the mold assembly.

[0030] Fig.16 For the injection molding machine Fig.15 A partial enlarged view of point B.

[0031] Fig.17 For the injection molding machine Fig.15 A partial enlarged view of point C.

[0032] Fig.18 It is a three-dimensional structural cross-sectional view of the fixed mold of the injection molding machine.

[0033] Fig.19 It is a schematic diagram of the three-dimensional structure of a partial cutaway of the head end truncation component of the injection molding machine.

[0034] Fig. 20 For the injection molding machine Fig.19 A partial enlarged view of point D.

[0035] Fig.21 It is a schematic diagram of the first three-dimensional structure of the push-pull rod and the driver of the injection molding machine.

[0036] Fig. 22 This is a second three-dimensional structural schematic diagram of the connection between the push-pull rod and the driver of the injection molding machine.

[0037] In the figure: 1. base; 101. feeding port; 102. frame; 103. support plate; 104. clearance frame; 105. support platform; 2. shell; 201. transparent cover; 202. protective cover; 203. inspection cover; 3. pipeline layout box; 4. hydraulic control box; 5. electric control box; 6. injection mechanism; 610. storage cabin; 611. insulation cabin; 612. electric control valve; 620. injection cylinder ;621, storage barrel; 622, heating ring; 623, shrink ring; 624, feed pipe; 630, rotation drive; 631, motor; 632, reducer; 633, traction frame; 640, telescopic drive; 641, mounting frame; 642, hydraulic cylinder; 650, push-pull rod; 651, screw; 652, piston; 7, mold assembly; 710, fixed mold; 711, sealing strip; 712, first cavity; 713, coarse channel; 714, thin channel; 715, first slot; 720, movable mold; 721, sealing groove; 722, second cavity; 723, convection channel; 724, second slot; 725, guide hole; 703, mounting plate; 704, split and close mold drive; 705, guide column; 8, air extraction and pressure storage mechanism; 801, air extraction pump; 802, pressure storage tank; 803, one-way valve; 804, electric control ball valve; 805, air extraction pipe; 806, exhaust pipe; 9, injection cut-off mechanism; 910, head end cut-off assembly; 911, first electric telescopic rod; 912, first plug plate; 913, tapered hole; 914, limit plate; 920, tail end cut-off assembly; 921, second plug plate; 922, second electric telescopic rod; 923, convection flow hole; 924, traction plate. DETAILED DESCRIPTION

[0038] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0039] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0040] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0041] The terms "including" and "having" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0042] like Figure 1-22 The injection molding machine shown includes a base 1 that can be placed directly on the ground, and main components such as a pipeline layout box 3, a hydraulic control box 4, an electric control box 5, an injection mechanism 6, a mold assembly 7, an air extraction and pressure storage mechanism 8 and an injection cut-off mechanism 9 are arranged on the base 1. The injection cut-off mechanism 9 is divided into two parts, a head end cut-off assembly 910 and a tail end cut-off assembly 920. The two parts can work independently of each other under the control of the same controller.

[0043] The specific structure of the mold assembly 7 includes a fixed mold 710, one side of the fixed mold 710 is fixedly connected to the injection mechanism 6, and the injection mechanism 6 includes a storage compartment 610 for storing raw materials for injection molding. The lower end of the storage compartment 610 is connected to an injection cylinder 620 for melting the solid raw materials and pressurizing or decompressing them. A push-pull rod 650 is movably connected inside the injection cylinder 620 for pushing the liquid raw materials. The push-pull rod 650 is located outside the injection cylinder 620. One end is connected to a rotary driver 630 for driving the push-pull rod 650 to rotate. The rotary driver 630 is connected to the fixed mold 710. A telescopic driver 640 is arranged between the two ends of the push-pull rod 650, which is used to drive the push-pull rod 650 to translate along the inner wall of the injection barrel 620. The rotation driver 630 includes a traction frame 633, and a motor 631 and a reducer 632 are fixedly connected to the traction frame 633. The motor 631 generally uses a servo motor. The output end of the motor 631 is connected to the input end of the reducer 632, taking into account high precision and high torque. The main part of the push-pull rod 650 is a screw 651. The spiral plate structure on the outer surface of the screw 651 can push the raw material to flow forward. The screw 651 and the reducer 632 are connected. The output end is connected with a piston 652. The main part of the injection cylinder 620 is a storage barrel 621. The inner wall of the storage barrel 621 is in close contact with the outer side of the piston 652, which can effectively prevent the liquid raw material from overflowing from the end of the storage barrel 621. On the other hand, the piston 652 that moves along the axis can directly change the pressure inside the storage barrel 621. The end of the storage barrel 621 is also fixedly connected with a shrink ring 623. An optical axis is connected between the piston 652 and the reducer 632, which is used to be inserted with the shrink ring 623 to form a sliding pair and a rotating pair, thereby improving the push-pull rod 650. In order to ensure the movement stability, a heating ring 622 is arranged on the outer side of the storage barrel 621 for maintaining the high-temperature molten state of the raw materials in the storage barrel 621. The main part of the storage compartment 610 is the insulation bin 611. A heating component is usually also arranged on the outer side of the storage compartment 610 to melt the raw materials in the insulation bin 611 into a liquid state from the beginning. The insulation bin 611 is connected to the inside of the storage barrel 621 through a feeding pipe 624, and an electric control valve 612 is also arranged between the insulation bin 611 and the feeding pipe 624 for controlling the connection and separation state between the storage barrel 621 and the insulation bin 611.

[0044] The telescopic drive 640 includes a mounting frame 641 fixedly connected to the fixed mold 710, a hydraulic cylinder 642 is connected between the mounting frame 641 and the traction frame 633, and there are at least two combinations of the mounting frame 641 and the hydraulic cylinder 642. The injection cylinder 620 is evenly arranged to ensure the smooth movement of the traction frame 633. The hydraulic cylinder 642 is connected to the pipeline inside the hydraulic control box 4. The hydraulic control box 4 also has a hydraulic oil pump as the power source of the entire hydraulic system. The upper surface of the base 1 is fixedly connected to the frame 102, the insulation chamber 611 is fixedly connected to the frame 102, and the injection cylinder 620 is fixedly connected to the fixed mold 710.

[0045] The other side of the fixed mold 710 is fixedly connected to a longitudinal mounting plate 703 through a guide column 705, and a split-mold driving 704 is arranged on the mounting plate 703. The movable end of the split-mold driving 704 is connected to a movable mold 720. The movable mold 720 and the fixed mold 710 are both in a vertical direction and parallel to each other. The movable mold 720 cooperates with the guide column 705 to form a sliding pair. For this purpose, a guide hole 725 is provided on the movable mold 720, which is just for the guide column 705 to pass through and cooperate to form a sliding pair. The side of the fixed mold 710 facing the movable mold 720 is provided with a first cavity 712, and the side of the movable mold 720 facing the fixed mold 710 is provided with a second cavity 72 2. The edges of the first cavity 712 and the second cavity 722 can be aligned to form a complete cavity. The fixed mold 710 is fixedly connected to the side of the movable mold 720 with a sealing strip 711. The sealing strip 711 completely surrounds the first cavity 712. The movable mold 720 is provided with a sealing groove 721 on the side of the fixed mold 710. The sealing groove 721 completely surrounds the second cavity 722. The sealing strip 711 is just embedded in the sealing groove 721 and fits tightly to form a closed sealing surface to ensure the airtightness inside the cavity after the mold is closed. The frame 102 is also fixedly connected to a horizontal support plate 103 and a support platform 105, and the fixed mold 710 is fixedly connected to the support platform 105, the mounting plate 703 is fixedly connected to the support plate 103, and a clearance frame 104 is also fixedly connected between the support plate 103 and the support platform 105. The movable mold 720 is located above the clearance frame 104 and does not contact the clearance frame 104. The base 1 is provided with a discharge port 101 that passes through the upper and lower surfaces below the clearance frame 104. The molded injection molded part leaves the injection molding machine after leaving the mold cavity. The pipeline layout box 3 and the hydraulic control box 4 are both located between the support plate 103 and the base 1. The support plate 103 directly contacts the upper surfaces of the pipeline layout box 3 and the hydraulic control box 4, so that the support plate 103 can be subjected to additional supporting force, and the electric control box 5 It is located in an empty position above the support plate 103 and will not interfere with the injection mechanism 6; a shell 2 is also provided on the base 1, and the shell 2 includes a transparent machine cover 201 for shielding the fixed mold 710 and the movable mold 720. The main body of the transparent machine cover 201 is still made of metal material, but a large part of the side is made of transparent material, which can not only avoid human contact when the injection molding machine is working, ensuring safety, but also facilitate the staff to observe the working status of the injection molding machine, as well as the protective machine cover 202 and the inspection cover 203 for shielding the splitting and closing mold drive 704. The inspection cover 203 is an easily detachable structure, which is convenient for inspection and maintenance of the components in the shell 2.

[0046] The bottom of the fixed mold 710 is provided with a head end cut-off assembly 910, which is used to control the on-off state of the first cavity 712 and the inside of the injection mechanism 6. Specifically: the bottom surface of the fixed mold 710 is provided with a first slot 715 extending upward, the fixed mold 710 is provided with a coarse channel 713 connecting the first slot 715 and the inside of the storage barrel 621, and the fixed mold 710 is also provided with a fine channel 714 connecting the first cavity 712 and the first slot 715. The axes of the coarse channel 713 and the fine channel 714 are colinear, but the inner diameter of the fine channel 714 is obviously smaller than that of the coarse channel 713; the head end cut-off assembly 910 also includes a first electric telescopic rod 911 connected to the base 1, which can realize precise position control. The first electric telescopic rod The movable end of 911 is connected to a vertical first plug plate 912 through a limit plate 914, which is tightly inserted into the first slot 715 to form a sliding pair. A sealing structure is usually arranged between the first plug plate 912 and the first slot 715 to ensure the air tightness when the first plug plate 912 separates and connects the coarse channel 713 and the thin channel 714. A conical hole 913 is provided on the first plug plate 912, and both ends of the conical hole 913 are suitable for being aligned with the coarse channel 713 and the thin channel 714 at the same time, so that the molten raw material can be gradually converged from the coarse channel 713 to the thin channel 714, and the narrow inner edge of the conical hole 913 can also easily separate the thin channel 714 from the continuous liquid raw material in the coarse channel 713.

[0047] The air extraction and pressure storage mechanism 8 includes an air extraction pump 801 and a pressure storage tank 802. The air extraction pump 801 and the pressure storage tank 802 both have two connecting ends, wherein the air inlet end of the air extraction pump 801 is connected to the inside of the second cavity 722 through an air extraction pipe 805, the exhaust end of the air extraction pump 801 is connected to one end of the pressure storage tank 802, and the other end of the pressure storage tank 802 is also connected to the air extraction pipe 805 through an exhaust pipe 806. An electrically controlled ball valve 804 is provided on the exhaust pipe 806 to control the connection and disconnection inside the exhaust pipe 806. A one-way valve 803 is provided on the air extraction pipe 805 to further prevent the air extraction pump 801 from reversing after shutdown. The air extraction pipe 805 is located between the one-way valve 803 and the movable mold 720 and is connected to the exhaust pipe 806. The high-pressure balloon in the pressure storage tank 802 can inject high-pressure gas into the mold cavity before mold separation, thereby helping the injection molded parts to be demolded.

[0048] The bottom of the movable mold 720 is provided with a tail end cut-off assembly 920, which is used to control the on-off state of the second cavity 722 and the exhaust pipe 805. The side of the movable mold 720 facing away from the fixed mold 710 is provided with a convection channel 723 connected to the second cavity 722, and the bottom surface of the movable mold 720 is provided with a second slot 724 connected to the convection channel 723. The tail end cut-off assembly 920 includes a second electric telescopic rod 922 connected to the bottom surface of the movable mold 720, which also has high control accuracy. The movable end of the second electric telescopic rod 922 is connected to a second plug plate 921 through a traction plate 924, which is used to tightly fit with the second slot 724 to form a sliding pair. Similarly, in order to ensure such tightness, a sealing structure is also provided between the second plug plate 921 and the second slot 724 to prevent the fluid in the convection channel 723 from overflowing from the second slot 724. The second plug plate 921 is provided with a convection flow hole 923, which can be aligned with the convection channel 723 to form a continuous space for exhaust and pressure.

[0049] The electric control valve 612, the motor 631, the vacuum pump 801, the electric control ball valve 804, the first electric telescopic rod 911 and the second electric telescopic rod 922 are all electrically connected to the controller in the electric control box 5, which is convenient for centralized wiring and control. The split mold drive 704 is powered by the hydraulic system and is connected to the pipeline in the hydraulic control box 4 through the pipeline in the pipeline layout box 3. In addition, the power lines and signal lines of the vacuum pump 801, the electric control ball valve 804, the first electric telescopic rod 911 and the second electric telescopic rod 922 also pass through the interior of the pipeline layout box 3 and can be well shielded and protected. The wires and pipes in the pipeline layout box 3 are not easy to collect dust or be scratched.

[0050] Working principle: In the initial state, the tapered hole 913 is completely offset from the coarse channel 713, the fine channel 714 is completely separated from the coarse channel 713 by the first plug plate 912, and the molten raw material liquid in the injection cylinder 620 cannot pass through the second plug plate 921. When injection molding is required, the mold separation and closing drive 704 pushes the movable mold 720 to move closer to the fixed mold 710 until the sealing strip 711 and the sealing groove 721 are completely matched, the convection hole 923 and the convection channel 723 are aligned, and the electric control ball valve 804 is in a closed state. The vacuum pump 801 is started to pump all the air in the mold cavity into the pressure storage tank 802 through the vacuum pipe 805, and the air pressure in the pressure storage tank 802 increases. After the mold cavity becomes vacuum, the convection holes 923 and the convection channels 723 are completely offset, and the vacuum pump 801 can be turned off. Then the screw 651 rotates under the drive of the rotary driver 630 to pressurize the molten raw material in the storage barrel 621. Then the first plug plate 912 moves under the drive of the first electric telescopic rod 911 to align the tapered hole 913 with the coarse channel 713 and the thin channel 714. Due to the strong pressure difference, the molten raw material liquid will instantly enter the mold cavity and fill every tiny corner in the mold cavity. Then the electric control valve 612 is closed to maintain the pressure. Then the first plug plate 912 moves again to align the tapered hole 913 with the coarse channel 713 and the thin channel 714. The thin channel 714 is completely offset, but remains connected with the thick channel 713. The telescopic driver 640 drives the piston 652 to reduce the pressure in the storage barrel 621 until the raw material in the tapered hole 913 is completely extracted. The first plug plate 912 will continue to move to completely offset the tapered hole 913 from the thick channel 713. At this time, the raw material in the mold cavity is completely separated from the raw material in the storage barrel 621. The raw material in the mold cavity can be quickly cooled and fixed, and the raw material in the storage barrel 621 can remain in a liquid state. After the molten raw material is cooled and solidified, the electric control ball valve 804 opens, and the second plug plate 921 moves to connect the convection hole 923 with the convection hole 923. The flow channel 723 is aligned again, and the high-pressure gas in the pressure storage tank 802 will instantly be filled into the space between the inner wall of the mold cavity and the outer side of the molded part through the exhaust pipe 806 and the exhaust pipe 805, forming a larger gap, and the air pressure in the gap is also greater than the external atmospheric pressure. At the moment when the movable mold 720 and the fixed mold 710 are separated, this air pressure difference will quickly allow the injection molded part to separate from the mold cavity and then be discharged from the discharge port 101. The entire demolding process is neat and tidy, and there are no problems such as wire drawing and adhesion. The demolding process of the injection molding machine does not require a moving demolding mechanism to be set inside the mold body, nor does it require a material-taking robot to be set outside the mold body. The structure is simpler and the demolding is more efficient.

[0051] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. The above embodiments and the description only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. An injection molding machine, characterized in that: The invention comprises a base (1), on which a pipeline arrangement box (3), a hydraulic control box (4), an electric control box (5), an injection mechanism (6), a mold assembly (7), an air extraction and pressure storage mechanism (8) and an injection cut-off mechanism (9) are arranged, the mold assembly (7) comprising a fixed mold (710), one side of the fixed mold (710) is fixedly connected to the injection mechanism (6), and the other side is fixedly connected to a mounting plate (703) via a guide column (705), the mounting plate (703) is provided with a mold separation and closing drive (704), the movable end of the mold separation and closing drive (704) is connected to a movable mold (720) and is suitable for cooperating with the guide column (705) to form a sliding pair, the fixed mold (710) is provided with a first cavity (712) on the side facing the movable mold (720), and the movable mold (720) is provided with a first cavity (712) on the side facing the fixed mold (710). A second cavity (722) is provided. A head end cut-off assembly (910) is provided at the bottom of the fixed mold (710) and is suitable for controlling the on-off state between the first cavity (712) and the inside of the injection mechanism (6). The air extraction and pressure storage mechanism (8) comprises an air extraction pump (801) and a pressure storage tank (802). The air inlet end of the air extraction pump (801) is connected to the inside of the second cavity (722) through an air extraction pipe (805). The air exhaust end of the air extraction pump (801) is connected to the pressure storage tank (802). The pressure storage tank (802) is also connected to the air extraction pipe (805) through an exhaust pipe (806). An electric control ball valve (804) is provided on the exhaust pipe (806). A tail end cut-off assembly (920) is provided at the bottom of the movable mold (720) and is suitable for controlling the on-off state between the second cavity (722) and the air extraction pipe (805).

2. The injection molding machine according to claim 1, characterized in that: The injection mechanism (6) comprises a material storage compartment (610), the lower end of the material storage compartment (610) is connected to an injection cylinder (620), a push-pull rod (650) is movably connected inside the injection cylinder (620), one end of the push-pull rod (650) located outside the injection cylinder (620) is connected to a rotary driver (630), and a telescopic driver (640) is provided between the rotary driver (630) and the fixed mold (710).

3. The injection molding machine according to claim 2, characterized in that: The rotary driver (630) comprises a traction frame (633), to which a motor (631) and a reducer (632) are fixedly connected; the main part of the push-pull rod (650) is a screw (651), and a piston (652) is connected between the screw (651) and the output end of the reducer (632); the main part of the injection cylinder (620) is a material storage barrel (621), the inner wall of the material storage barrel (621) is in close contact with the outer side surface of the piston (652), and the end of the material storage barrel (621) is provided with a shrink ring (623); an optical axis is connected between the piston (652) and the reducer (632), and is suitable for being inserted into the shrink ring (623) to form a sliding pair and a rotating pair; and a heating ring (622) is provided on the outer side surface of the material storage barrel (621).

4. The injection molding machine according to claim 3, characterized in that: The main part of the material storage cabin (610) is a heat preservation bin (611), the heat preservation bin (611) is connected to the interior of the material storage barrel (621) via a feed pipe (624), an electric control valve (612) is provided between the heat preservation bin (611) and the feed pipe (624), the telescopic drive (640) comprises a mounting frame (641) fixedly connected to the fixed mold (710), a hydraulic cylinder (642) is connected between the mounting frame (641) and the traction frame (633), and is connected to a pipeline inside the hydraulic control box (4).

5. The injection molding machine according to claim 4, characterized in that: The upper surface of the base (1) is fixedly connected to a frame (102), the heat preservation chamber (611) is fixedly connected to the frame (102), the frame (102) is also fixedly connected to a support plate (103) and a support platform (105), the fixed mold (710) is fixedly connected to the support platform (105), the mounting plate (703) is fixedly connected to the support plate (103), a clearance frame (104) is also fixedly connected between the support plate (103) and the support platform (105), and the base (1) is fixedly connected to the clearance frame (104). A material discharge port (101) penetrating the upper and lower surfaces is provided below the support plate (103), the pipeline arrangement box (3) and the hydraulic control box (4) are both located between the support plate (103) and the base (1), and the electric control box (5) is located above the support plate (103); a shell (2) is also provided on the base (1), and the shell (2) includes a transparent machine cover (201) for shielding the fixed mold (710) and the movable mold (720), and a protective machine cover (202) and an inspection cover (203) for shielding the split and close mold drive (704).

6. The injection molding machine according to any one of claims 1 to 5, characterized in that: A sealing strip (711) is fixedly connected to the side of the fixed mold (710) facing the movable mold (720), and the sealing strip (711) surrounds the first cavity (712). A sealing groove (721) is provided on the side of the movable mold (720) facing the fixed mold (710), and the sealing groove (721) surrounds the second cavity (722). The sealing strip (711) is suitable for being embedded in the sealing groove (721) and fitting tightly. The movable mold (720) is provided with a guide hole (725) suitable for cooperating with the guide column (705) to form a sliding pair.

7. The injection molding machine according to any one of claims 4 to 5, characterized in that: The bottom surface of the fixed mold (710) is provided with a first slot (715), the fixed mold (710) is provided with a coarse channel (713) connecting the first slot (715) and the inside of the storage barrel (621), and the fixed mold (710) is further provided with a fine channel (714) connecting the first cavity (712) and the first slot (715); the head end truncation component (910) comprises a first electric telescopic rod (911) connected to the base (1), the movable end of the first electric telescopic rod (911) is connected to a first plug plate (912) through a limit plate (914), and is suitable for being plugged into the first slot (715) to form a sliding pair, and the first plug plate (912) is provided with a tapered hole (913), and the two ends of the tapered hole (913) are suitable for being respectively aligned with the coarse channel (713) and the fine channel (714) at the same time.

8. The injection molding machine according to claim 7, characterized in that: A convection channel (723) connected to the second cavity (722) is provided on the side of the movable mold (720) facing away from the fixed mold (710); a second slot (724) connected to the convection channel (723) is provided on the bottom surface of the movable mold (720); the tail end truncation component (920) comprises a second electric telescopic rod (922) connected to the bottom surface of the movable mold (720); the movable end of the second electric telescopic rod (922) is connected to a second plug plate (921) via a traction plate (924) and is suitable for being plugged into the second slot (724) to form a sliding pair; and a convection flow hole (923) is provided on the second plug plate (921) and is suitable for being aligned with the convection channel (723).

9. The injection molding machine according to claim 7, characterized in that: The electric control valve (612), the electric motor (631), the air pump (801), the electric control ball valve (804), the first electric telescopic rod (911) and the second electric telescopic rod (922) are all electrically connected to a controller in the electric control box (5); the mold opening and closing drive (704) is powered by a hydraulic system and is connected to a pipeline in the hydraulic control box (4) through a pipeline in the pipeline arrangement box (3).

10. The injection molding machine according to any one of claims 1 to 5, characterized in that: The exhaust pipe (805) is also provided with a one-way valve (803), and the exhaust pipe (805) is connected to the exhaust pipe (806) at a location between the one-way valve (803) and the movable mold (720).

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