Injection molding machine for plastic processing

Abstract

The present invention discloses an injection molding machine for plastic processing, which relates to the technical field of injection molding machines and includes a frame, an injection component for extruding raw materials, the frame being sequentially provided with a driving component, an injection component, a hopper, and a molding component, and a control mechanism for removing bubbles present in the injection component, the driving component including a driving motor and a transmission gear set, the transmission gear set being connected to the driving motor. By improving the injection component in an existing injection molding machine, the injection molding machine does not need to be vented during use, so that the injection site is maintained in a relatively vacuum state, and bubbles generated during the subsequent addition of raw materials to melt, mix, stir, and promote the raw materials can be effectively removed, ensuring that the raw materials injected into the mold are bubble-free, effectively avoiding defects in the injection molded product caused by bubbles in the liquid.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding machines, in particular to an injection molding machine for plastic processing. Background Art

[0002] An injection molding machine, also known as an injection molding machine or injection molding machine, is the primary molding equipment used to create various shapes of plastic products from thermoplastics or thermosetting plastics using plastic molding molds. It is available in vertical, horizontal, and all-electric models. The machine heats the plastic and applies high pressure to the molten plastic, ejecting it and filling the mold cavity. It typically consists of an injection system, a mold clamping system, a hydraulic transmission system, an electrical control system, a lubrication system, a heating and cooling system, a safety monitoring system, and a frame.

[0003] However, when the existing injection molding machine is in use, the material is pushed and mixed by the screw component therein. However, when the screw stirs the material, some gas will be stirred into the injection component. Another phenomenon is that when the raw material is placed in the injection system, the raw material will carry some air into the barrel, but the existing injection molding machine is unable to remove the gas that enters later, causing this part of the gas to be directly injected into the mold. If this part of the gas is located on the surface of the product, it will cause serious defects on the surface of the product. If it is located inside the product, although there are no defects on the surface, it will cause the product to be partially hollow, which greatly reduces the performance of the product. Summary of the Invention

[0004] The technical solution of the present invention addresses the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technology. An embodiment of the present invention provides an injection molding machine for plastic processing to solve the technical problem that when the existing injection molding machine injects molten liquid, there may be bubbles in the liquid, and the injection molding machine cannot solve the bubbles.

[0005] An embodiment of the present invention adopts the following technical solution: an injection molding machine for plastic processing, comprising a frame, an injection component for extruding raw materials, a driving component, an injection component, a hopper and a molding component arranged on the frame in sequence, and a control mechanism for removing bubbles in the injection component, the driving component comprising a driving motor and a transmission gear group, and the transmission gear group is connected to the driving motor.

[0006] Furthermore, the injection component includes a cylinder, a connecting rod is provided in the cylinder, the connecting rod is connected to the transmission gear group, the end of the connecting rod is movably connected to the extrusion block, a matching groove is provided in the extrusion block, the connecting rod is hollow, an electric telescopic rod is provided in the connecting rod, the end of the electric telescopic rod is connected to the extrusion block through a T-block, a connecting spring is provided outside the T-block, a screw leaf is provided outside the connecting rod, a protrusion is provided at the end of the extrusion block, an injection port is provided on the outside of the cylinder, and an exhaust hole is provided in the cylinder on the side where the extrusion block is located.

[0007] Furthermore, the screw blade gap gradually decreases from the feeding position to the extrusion position.

[0008] Furthermore, the position of the feed port of the extrusion block changes from large to small, and the raised portion is an arc surface.

[0009] Furthermore, the control mechanism includes a connecting ring and several connecting boxes, the connecting ring includes a first connecting ring and a second connecting ring, the connecting box passes through the cylinder and is inside the cylinder, the connecting box is hollow, a contact block is provided at the bottom of the connecting box, and a pressure sensor is provided between the contact block, the connecting box and the contact block.

[0010] Furthermore, the plurality of connection boxes form an annular ring.

[0011] Furthermore, the first connecting ring and the second connecting ring have the same connection structure, and a number of connecting tubes are arranged inside each of the connecting tubes, a limiting block is arranged inside each of the connecting tubes, an insertion tube is arranged outside each of the connecting tubes, the insertion tube passes through the cylinder body, a matching block is arranged inside the connecting tube, a connecting frame is arranged outside the insertion tube, an electric-controlled telescopic rod is arranged between the connecting frame and the outer wall of the cylinder, the pressure sensor is electrically connected to the electric-controlled telescopic rod, the first connecting ring and the second connecting ring are connected to the first connecting tube and the second connecting tube in sequence below, the end of the first connecting tube is connected to a suction box that provides suction, and the end of the second connecting box is connected to a feeding box that provides thrust.

[0012] Furthermore, the connecting tube and the insertion tube are slidably connected, and the matching block and the limiting block are both provided with flow holes, and the flow holes on the matching block and the limiting block are staggered.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] First, when using the injection device for injection, by adding an extrusion block in the barrel, and in the initial state, the extrusion block and the inner wall of the barrel are in contact with each other, so that there is no gap between the barrel and the extrusion block, so that when injecting in the later stage, there is no need to perform exhaust treatment first, avoiding the generation of waste during the initial injection molding. Because there is a large amount of gas at the exhaust port of the injection molding machine during the injection molding, the initial injection stage is more likely to perform exhaust treatment, resulting in the injected raw material containing a large amount of gas. When the raw material containing a large amount of gas is molded, a large number of defects will appear on the surface, resulting in ineffective molding. For this reason, this part of the raw material needs to be discharged, but after using the injection molding part, there is no need for exhaust treatment;

[0015] At the same time, the extrusion block can also be used to extrude the raw materials before discharge (because when the raw materials are squeezed in through the screw blades, the gap between the extrusion block and the barrel is small, so when the raw materials are squeezed from a larger gap to a smaller gap, the raw materials will be stronger). At this time, if there are bubbles in the raw materials, the raw materials containing bubbles will be squeezed and compressed to merge together (similar to the bubbles when the film is applied, the bubbles are rolled together by rolling, and then merged). If the bubbles are too large, they will be separated to prevent them from being too large. In order to cooperate with the extrusion block, the screw blades are set gradually. In the initial state, the gap is larger to increase the pushing speed, and the gap becomes smaller towards the end, which reduces the pushing amount, but the pushing force becomes greater, so that the raw materials can better enter the gap between the extrusion block and the barrel.

[0016] Secondly, the control mechanism of the present invention can detect whether the solution squeezed into the gap between the extrusion block and the cylinder contains bubbles. If the solution contains bubbles, the control mechanism can be used to extract the solution to avoid mixing the bubble-containing solution into the bubble-free solution, which greatly reduces the possibility of bubbles in the solution. At the same time, after the material is extracted by the mechanism, in order to avoid the formation of cavities in the raw material, which may lead to insufficient material quantity when mixed with the subsequent viscous solution, the melted solution without air is additionally added to avoid the reduction of material and the resulting unqualified injection molded products.

[0017] In summary, by improving the injection components in the existing injection molding machine, the injection molding machine does not need to be vented during use, so that the injection site is kept in a relatively vacuum state, and the bubbles generated during the subsequent addition of raw materials to melt, mix, and stir the raw materials can be effectively removed, ensuring that the raw materials injected into the mold are bubble-free raw materials, effectively avoiding defects in the injection molded products caused by bubbles in the liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the main structure of the present invention from a first perspective;

[0020] Figure 2 This is a schematic diagram of the structure of the main body of the present invention from a second viewing angle;

[0021] Figure 3 This is a schematic structural diagram of the injection molded component of the present invention;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the cylinder of the present invention;

[0023] Figure 5 This is a schematic structural diagram of the cylinder of the present invention from a second viewing angle;

[0024] Figure 6 For the present invention Figure 5 A in the middle is an enlarged structural diagram;

[0025] Figure 7 Schematic diagram of the control mechanism structure of the present invention;

[0026] Figure 8 Schematic diagram of the connecting ring structure of the present invention;

[0027] Figure 9 This is a schematic cross-sectional view of the connection structure between the insertion tube and the connecting tube of the present invention.

[0028] Reference numerals:

[0029] 1. Injection component; 11. Connecting rod; 12. Screw blade; 13. Cylinder; 14. Electric telescopic rod; 15. Matching groove; 16. Extrusion block; 17. Raised part; 18. Injection port; 2. Molded component; 3. Frame; 4. Driving component; 5. Hopper; 6. Control mechanism; 61. First connecting pipe; 62. Second connecting pipe; 63. Suction box; 64. Feed box; 65. Connecting cylinder; 66. Connecting frame; 67. Electric telescopic rod; 68. Insertion tube; 69. Limiting block; 610. Matching block; 611. Contact block; 612. Connecting box; 613. Pressure sensor; 614. First connecting ring; 615. Second connecting ring. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention.

[0032] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] The following combination Figures 1 to 9 As shown, an embodiment of the present invention provides an injection molding machine for plastic processing, including a frame 3, an injection component 1 for extruding raw materials, a driving component 4, an injection component 1, a hopper 5 and a molding component 2 are sequentially arranged on the frame 3, and a control mechanism 6 for removing bubbles in the injection component 1, the driving component 4 includes a driving motor and a transmission gear set, and the transmission gear set is connected to the driving motor.

[0036] During operation, by improving the injection component 1 in the existing injection molding machine, the injection molding machine does not need to be vented during use, so that the injection site is kept in a relatively vacuum state, and the bubbles generated during the subsequent addition of raw materials to melt, mix, and stir the raw materials can be effectively removed, ensuring that the raw materials injected into the mold are bubble-free raw materials, effectively avoiding defects in the injection molded products caused by bubbles in the liquid.

[0037] Specifically, the injection component 1 includes a barrel 13, a connecting rod 11 is provided in the barrel 13, the connecting rod 11 is connected to the transmission gear set, the end of the connecting rod 11 is movably connected to the extrusion block 16, the extrusion block 16 is provided with a matching groove 15, the connecting rod 11 is hollow, an electric telescopic rod 14 is provided in the connecting rod 11, the end of the electric telescopic rod 14 is connected to the extrusion block 16 through a T-block, a connecting spring is provided outside the T-block, a screw leaf 12 is provided outside the connecting rod 11, a protrusion 17 is provided at the end of the extrusion block 16, an injection port 18 is provided on the outside of the barrel 13, and an exhaust hole is provided in the barrel 13 on the side where the extrusion block 16 is located.

[0038] Specifically, the gap between the screw blades 12 gradually decreases from the feeding position to the extrusion position.

[0039] During operation, in the initial state, due to the relatively large gap, the material can be pushed quickly when the screw blades 12 rotate. As the gap between the screw blades 12 becomes smaller and smaller, the pushing amount becomes smaller and smaller, making it easier for the molten liquid to enter the gap between the extrusion block 16 and the barrel 13.

[0040] Specifically, the position of the feed port of the extrusion block 16 changes from large to small, and the raised portion 17 is an arc surface.

[0041] During operation, the diameter changes from large to small in the process of use. First, it is convenient for the molten liquid to enter. At this time, it can have a rolling effect on the molten liquid. First, it can increase the pressure on the melt. Second, it can make the bubbles inside gather together.

[0042] Specifically, the control mechanism 6 includes a connecting ring and several connecting boxes 612, the connecting ring includes a first connecting ring 614 and a second connecting ring 615, the connecting box 612 passes through the cylinder 13 and is inside the cylinder 13, the connecting box 612 is hollow, and a contact block 611 is provided at the bottom of the connecting box 612, and a pressure sensor 613 is provided between the contact block 611, the connecting box 612 and the contact block 611.

[0043] Specifically, the plurality of connection boxes 612 form an annular ring.

[0044] Specifically, the first connecting ring 614 and the second connecting ring 615 have the same connection structure, and a plurality of connecting tubes 65 are arranged inside each of the connecting tubes 65, and a limiting block 69 is arranged inside each of the connecting tubes 65. An insertion tube 68 is arranged outside each of the connecting tubes 65, and the insertion tube 68 passes through the cylinder 13. A matching block 610 is arranged inside the connecting tube 65, and a connecting frame 66 is provided on the outer sleeve of the insertion tube 68. An electrically controlled telescopic rod 67 is arranged between the connecting frame 66 and the outer wall of the cylinder 13, and the pressure sensor 613 is electrically connected to the electrically controlled telescopic rod 67. The first connecting ring 614 and the second connecting ring 615 are connected to the first connecting tube 61 and the second connecting tube 62 in sequence below. The end of the first connecting tube 61 is connected to a suction box 63 that provides suction, and the end of the second connecting box 612 is connected to a feeding box 64 that provides thrust.

[0045] Specifically, the connecting tube 65 and the insertion tube 68 are slidingly connected, and the matching block 610 and the limiting block 69 are both provided with flow holes, and the flow holes on the matching block 610 and the limiting block 69 are staggered. The first connecting ring 614 and the second connecting ring 615 have the same structure but different functions, one is used for sucking material and the other is used for spraying material to achieve the effect of replenishing material.

[0046] Working principle: First, the plastic particles are placed into the barrel 13 through the hopper 5. The plastic particles are gradually transformed into a molten state under the action of the heating component in the barrel 13. The viscosity of the melted plastic is relatively high. At this time, the connecting rod 11 rotates under the action of the drive motor and the drive gear set. The rotation of the connecting rod 11 drives the screw blades 12 to rotate. The rotation of the screw blades 12 drives the molten liquid to change its position, which has a propulsion effect on the liquid. The extrusion block 16 and the barrel 13 are in contact with each other in the initial state, so that there is no gap between the extrusion block 16 and the barrel 13 in the initial state. When the liquid is driven to move by the screw blades 12, the molten plastic will first be moved. The molten liquid is squeezed into the gap between the extrusion block 16 and the cylinder 13 from the opening which gradually becomes smaller. During the process of squeezing the solution in, the liquid is squeezed at this time. Secondly, since the gap is small, when the raw materials are squeezed in, the molten liquid can be rolled at this time. Firstly, the pressure on the melt can be increased, and secondly, the bubbles inside can be gathered together. When the squeezed solution passes through the contact block 611, the pressure of the solution with bubbles and without bubbles will be different (the presence of bubbles will form discontinuous areas in the molten liquid, and the compressibility and elasticity of these areas are higher than those of the molten liquid itself).When the molten liquid passes through a narrow space, the compression and recovery of bubbles will cause pressure fluctuations, which may produce higher pressure peaks locally. The molten liquid without bubbles is a more uniform medium. When passing through a narrow space, its pressure distribution is more uniform, and the pressure peak is usually lower, unless there are other factors such as viscosity or flow rate that cause pressure accumulation). At this time, the pressure sensor 613 connected to the contact block 611 will sense the pressure change at this location, which means that bubbles have appeared. The pressure sensor 613 sends a signal to control the electric telescopic rod 67 at the corresponding position to work (the reaction time of the electric telescopic rod 67 is the time it takes for the liquid in the detection area to flow to the insertion of the first connecting ring 614). The electric telescopic rod 14 contracts and drives the insertion tube 68 to be inserted into the molten liquid with bubbles. When the position of the insertion tube 68 changes, the through hole between the matching block 610 in the insertion tube 68 and the limiting block 69 in the connecting tube 65 forms a flow channel, and the suction machine in the suction box 63 supplies the entire first connecting tube 61 to the first connecting tube 61. A connecting ring 614 provides suction, and the insertion tube 68 that forms a circulation channel can exert suction, thereby sucking away the raw material there. The insertion tube 68 that does not form a circulation channel will not provide suction, so that only the raw material at the bubble will be sucked away. Then, when the solution in the cavity formed after being sucked away passes through the second connecting ring 615, the missing raw material will be sprayed out under the action of the material replenishment box 64 and the second connecting tube 62 to fill the cavity (after the electric-controlled telescopic rod 67 in the first connecting ring 614 works, the electric-controlled telescopic rod 67 at the corresponding position of the second connecting ring 615 will also work synchronously at a relative interval, thereby achieving the effect of one sucking and one spraying). At this time, the electric telescopic rod 14 is working synchronously, and the electric telescopic rod 14 pulls the extrusion block to move. At this time, a gap appears between the extrusion block and the cylinder 13, and the solution for removing bubbles enters the gap. As the treated solution continues to enter, when the solution accumulates to a certain extent, it is sprayed into the molded component 2 through the injection port.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection molding machine for plastic processing, comprising a frame (3), characterized in that: It also includes an injection component (1) for extruding a raw material, a driving component (4), an injection component (1), a hopper (5) and a molding component (2) arranged on the frame (3) in sequence, and a control mechanism (6) for removing bubbles in the injection component (1), wherein the driving component (4) includes a driving motor and a transmission gear set, and the transmission gear set is connected to the driving motor; The injection component (1) includes a barrel (13), a connecting rod (11) is provided in the barrel (13), the connecting rod (11) is connected to the transmission gear set, the end of the connecting rod (11) is movably connected to the extrusion block (16), the extrusion block (16) is provided with a matching groove (15), the connecting rod (11) is hollow, an electric telescopic rod (14) is provided in the connecting rod (11), the end of the electric telescopic rod (14) is connected to the extrusion block (16) through a T-shaped block, the T-shaped block is provided with a connecting spring, the connecting rod (11) is provided with a screw leaf (12), the end of the extrusion block (16) is provided with a protrusion (17), the outer side of the barrel (13) is provided with an injection port (18), and the barrel (13) on the side where the extrusion block (16) is located is provided with an exhaust hole; The control mechanism (6) includes a connecting ring and a plurality of connecting boxes (612), wherein the connecting ring includes a first connecting ring (614) and a second connecting ring (615), and the connecting box (612) penetrates the cylinder (13) to the interior of the cylinder (13), and the connecting box (612) is in a hollow state. A contact block (611) is provided at the bottom of the connecting box (612), and a pressure sensor (613) is provided between the contact block (611) and the connecting box (612); The first connecting ring (614) and the second connecting ring (615) have the same structure, and are both provided with a plurality of connecting tubes (65) inside. Each connecting tube (65) is provided with a limiting block (69) inside. Each connecting tube (65) is provided with an insertion tube (68) outside. The insertion tube (68) passes through the cylinder (13). A matching block (610) is provided inside the insertion tube (68). A connecting frame (66) is provided on the outer shell of the insertion tube (68). An electric telescopic rod (67) is provided between the connecting frame (66) and the outer wall of the cylinder (13). The pressure sensor (613) is electrically connected to the electric telescopic rod (67). The first connecting ring (614) and the second connecting ring (615) are connected to the first connecting tube (61) and the second connecting tube (62) in sequence below. The end of the first connecting tube (61) is connected to a suction box (63) for providing suction force, and the end of the second connecting tube (62) is connected to a feeding box (64) for providing thrust force. The connecting tube (65) and the inserting tube (68) are slidably connected, and the matching block (610) and the limiting block (69) are both provided with flow holes, and the flow holes on the matching block (610) and the limiting block (69) are staggered.

2. The plastics processing injection molding machine according to claim 1, characterized in that: The gap between the screw blades (12) gradually decreases from the feeding position to the extrusion position.

3. The plastics processing injection molding machine according to claim 1, characterized in that: The position of the feed opening of the extrusion block (16) changes from large to small, and the raised portion (17) is an arc surface.

4. The plastics processing injection molding machine according to claim 1, characterized in that: The plurality of connection boxes (612) form an annular ring.

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