Metering injection mechanism, injection molding raw material extrusion method and injection molding equipment

Abstract

According to the metering injection mechanism and the injection molding equipment, a downward pressing mechanism is additionally arranged in a feeding cylinder, a pushing rod is matched with the downward pressing mechanism to extrude an injection molding raw material towards the output end of an injection material pipe, and therefore the situation that glass fibers are broken due to spiral stirring of the injection molding raw material is avoided; the structural strength of an injection molding finished product is improved, the output dosage of injection molding raw materials is accurate, and the production and processing efficiency is higher; the injection molding raw material extrusion method comprises the steps that injection molding raw materials meeting multiple times of injection molding are injected into a material supply cylinder, an internal pipeline of an injection material pipe is filled with the injection molding raw materials, and then the injection cylinder drives a material pushing rod to move with a first thrust value so as to exhaust gas among the injection molding raw materials from an exhaust structure; and the injection cylinder drives the material pushing rod to move by the preset stroke or the preset duration according to the second thrust value, and then the injection cylinder repeatedly acts according to the second thrust value to quantitatively extrude the injection molding raw materials for multiple times, so that multiple injections are carried out after one-time feeding, and the injection molding machining efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding production, and in particular to a metering injection mechanism, an injection molding raw material extrusion method and injection molding equipment. Background Art

[0002] When producing injection molded products, an injection mechanism is usually used to inject the raw materials required for injection molding into the mold for molding. The current injection mechanism uses a moving cylinder to drive the injection mechanism as a whole to move toward the mold to support the mold, and then the hydraulic motor rotates to drive the screw to rotate. The outside of the screw is sleeved with a material tube along its length, and the upper side of the material tube is provided with a feed port for inputting injection molding raw materials. As the screw rotates, the thread on the screw can push the injection molding raw materials into the front end of the material tube to store materials, and the thrust formed by the shooting cylinder pushes the screw forward to send the injection molding raw materials into the mold.

[0003] The screw teeth on the screw have the functions of stirring, pushing and squeezing, so they are widely used in the injection mechanism of current injection molding equipment with good effects. However, in order to improve the mechanical strength of parts, some existing injection molding products often add glass fiber to the plastic. The glass fiber is in the form of long filaments. When the screw rotates, the glass fiber will be cut or twisted off, resulting in a decrease in the strength of the plastic product.

[0004] In addition, in the injection mechanism using a screw, the screw rotates a certain number of turns to realize the feeding action, and then the fed part is extruded. Due to the different densities of the injection molding materials and the unstable degree of extrusion of the injection molding materials when the screw rotates, the quality of the product formed by each injection is also unstable, and the screw pushing also has a certain delay characteristic, resulting in low work efficiency. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one of the purposes of the present invention is to propose a metering injection mechanism that can avoid spiral stirring of injection molding materials to improve the strength of the finished product, output accurate dosage, and have high working efficiency; the second purpose is to propose an injection molding material extrusion method using the above-mentioned metering injection mechanism; the third purpose is to propose an injection molding device using the above-mentioned metering injection mechanism.

[0006] A metering injection mechanism according to an embodiment of the first aspect of the present invention includes: a mounting seat; a cylinder body slidably arranged on the mounting seat, and an injection tube extending along its sliding direction is provided on the cylinder body; a moving cylinder, one end of which is connected to the cylinder body and the other end is fixedly installed on the injection mold plate, and is used to drive the output end of the injection tube to press against the input port of the injection mold; a feeding cylinder, which is arranged on the upper side wall of the injection tube in the vertical direction and is connected to the interior of the injection tube; a pressing mechanism, which is lifted and lowered on the feeding cylinder and presses the injection material in the feeding cylinder downward into the injection tube; a pushing rod, one end of which is slidably penetrated through the injection tube, and the other end of the pushing rod is connected to a shooting cylinder that drives it to move close to the injection mold to output the injection material.

[0007] The metering injection mechanism according to the embodiment of the present invention has at least the following beneficial effects:

[0008] The metered injection mechanism of the above structure adds a downward pressure mechanism in the feeding cylinder, and uses a push rod in cooperation with the downward pressure mechanism to extrude the injection molding material toward the output end of the injection material tube, thereby avoiding the spiral stirring of the injection molding material and breaking the glass fiber, thereby improving the structural strength of the injection molded product. Moreover, compared with the traditional method of the screw, the output dosage of the injection molding material is accurate and the production and processing efficiency is higher.

[0009] In some embodiments of the present invention, two parallel slide rails are arranged on the mounting seat, and the extension direction of the slide rails is consistent with the sliding direction of the cylinder body. The cylinder body has sliders that slide on the two slide rails respectively, the injection pipe is horizontally arranged in the middle position between the two slide rails, and the feeding cylinder is vertically arranged in the middle position between the two slide rails.

[0010] In some embodiments of the present invention, support frames are provided on both sides of the cylinder body respectively corresponding to the two slide rails, the sliding block is installed on the support frame, a first installation channel for installing the injection pipe is horizontally penetrated through the cylinder body, the cylinder body is provided with a second installation channel connected to the first installation channel and extending upward, the feeding cylinder is installed in the second installation channel, and the first installation channel and the second installation channel are both located in the middle position between the two support frames.

[0011] In some embodiments of the present invention, the second mounting channel includes a feed port connected to the upper side of the first mounting channel and a conical guide surface formed on the outer peripheral edge of the feed port and being wider at the top and narrower at the bottom. The feed port is in the shape of a long strip parallel to the first mounting channel, and the lower end of the feeding cylinder is sealed and connected to the outer peripheral edge of the conical guide surface.

[0012] In some embodiments of the present invention, the pressing mechanism includes two pressing cylinders arranged vertically upward, the cylinder bodies of the two pressing cylinders are respectively fixedly connected to the opposite sides of the second mounting channel, a lifting beam is connected between the upper ends of the output rods of the two pressing cylinders, a pressing rod extending downward into the feeding cylinder is provided in the middle part of the lifting beam, the pressing rod is provided with a cylinder piston matching the inner circumferential wall of the feeding cylinder, and the cylinder piston is a cone that matches the conical guide surface and is wide at the top and narrow at the bottom.

[0013] In some embodiments of the present invention, the cylinder body is provided with a third mounting channel on both sides of the first mounting channel, the third mounting channel is arranged parallel to the slide rail and is located directly above the corresponding supporting foot, the cylinder bodies of the two shooting cylinders are respectively installed in the two third mounting channels, the output rods of the two shooting cylinders extend out of one end of the cylinder body and are connected with a gantry, the two sides of the gantry are respectively slidably arranged on the two slide rails, and the end of the push rod away from the injection pipe is fixedly connected to the middle of the gantry.

[0014] In some embodiments of the present invention, one end of the injection tube has a discharge nozzle extending from the cylinder body, and the discharge nozzle is used to connect to the input port of the injection mold. The other end of the injection tube is provided with a scraper sleeve that can contact the outer peripheral wall of the push rod to prevent the injection molding material from overflowing.

[0015] In some embodiments of the present invention, the outer peripheral wall of the push rod is radially recessed to form a spiral groove, and the spiral groove extends along the length direction of the push rod. A spiral gas channel that can only allow gas to be discharged outward can be defined between the spiral groove and the scraper sleeve.

[0016] According to a second aspect of the present invention, a method for extruding raw materials for injection molding is provided. The metering injection mechanism of any of the above technical solutions is applied, and the injection tube is connected to an exhaust structure, comprising the following steps: the moving cylinder drives the output end of the injection tube to press against the input port of the injection mold, and injects the injection raw materials into the feeding cylinder. The amount of the injection raw materials satisfies the injection mold for multiple injection molding. The shooting cylinder drives the push rod to move away from the injection mold so that the internal pipeline of the injection tube is connected to the feeding cylinder. The pressing mechanism drives the injection raw materials to fill the internal pipeline of the injection tube. Then, the shooting cylinder drives the push rod to move close to the injection mold with a first thrust value to discharge the gas between the injection raw materials in the injection tube from the exhaust structure. Then, the shooting cylinder drives the push rod to move close to the injection mold with a second thrust value for a preset stroke or a preset time. The second thrust value is greater than the first thrust value. Then, the shooting cylinder repeatedly drives the push rod to move close to the injection mold for a preset stroke or a preset time with the second thrust value, thereby realizing multiple quantitative extrusion of the injection raw materials. The above injection molding raw material extrusion method can meet the needs of multiple injections after one feeding, further improve the efficiency of the injection molding process, avoid the interruption of glass fiber by spiral stirring of the injection molding raw materials, and improve the structural strength of the injection molded product. Moreover, compared with the traditional method of the screw, the output dosage of the injection molding raw material is accurate, which is conducive to improving the quality stability of the injection molded product.

[0017] According to an embodiment of the third aspect of the present invention, an injection molding device includes a metering injection mechanism of any of the above technical solutions. The injection molding device can avoid the interruption of glass fibers by spiral stirring of injection molding materials, improve the structural strength of the injection molded product, and compared with the traditional method of the screw, the output dosage of the injection molding materials is accurate and the production and processing efficiency is higher.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the metering injection mechanism of the present invention;

[0021] Figure 2 for Figure 1 A structural schematic diagram of another perspective of the embodiment;

[0022] Figure 3 for Figure 1 A schematic cross-sectional view of an embodiment;

[0023] Figure 4 for Figure 1 A schematic structural diagram of the cylinder body of an embodiment.

[0024] Reference numerals:

[0025] Mounting seat 100; slide rail 110; cylinder body 200; slider 210; first mounting channel 220; second mounting channel 230; feed port 231; conical guide surface 232; third mounting channel 240; support frame 250; injection tube 300; discharge nozzle 310; scraper sleeve 320; moving cylinder 400; feeding cylinder 500; pressing mechanism 600; pressing cylinder 610; lifting beam 620; pressing rod 630; cylinder piston 640; pushing rod 700; shooting cylinder 710; gantry 720. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention 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 therefore should not be understood as a limitation on the present invention.

[0028] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] See also Figures 1 to 4 A metering injection mechanism of the present invention comprises: a mounting seat 100; a cylinder body 200, which is slidably arranged on the mounting seat 100, and an injection tube 300 extending along its sliding direction is arranged on the cylinder body 200; a moving cylinder 400, one end of which is connected to the cylinder body 200 and the other end is fixedly installed on the injection mold plate, and is used to drive the output end of the injection tube 300 to press against the input port of the injection mold; a feeding cylinder 500, which is arranged on the upper side wall of the injection tube 300 in the vertical direction and is connected to the interior of the injection tube 300; a pressing mechanism 600, which is lifted and lowered on the feeding cylinder 500 to press the injection material in the feeding cylinder 500 downward into the injection tube 300; a push rod 700, one end of which is slidably penetrated in the injection tube 300, and the other end of which is connected to a shot cylinder 710 that drives it to move close to the injection mold to output the injection material.

[0031] The metered injection mechanism of the above structure adds a pressing mechanism 600 in the feeding cylinder 500, and utilizes the push rod 700 to cooperate with the pressing mechanism 600 to extrude the injection molding material toward the output end of the injection tube 300, thereby avoiding the spiral stirring of the injection molding material and breaking the glass fiber, thereby improving the structural strength of the injection molded product. Moreover, compared with the traditional method of the screw, the output dosage of the injection molding material is accurate, and the production and processing efficiency is higher.

[0032] See also Figure 1 and Figure 2In some embodiments of the present invention, in order to achieve smooth sliding of the cylinder body 200 relative to the mounting seat 100, two parallel slide rails 110 are arranged on the mounting seat 100, and the extension direction of the slide rails 110 is consistent with the sliding direction of the cylinder body 200. The cylinder body 200 has a slider 210 that slides on the two slide rails 110 respectively, and the injection tube 300 is horizontally arranged at the middle position between the two slide rails 110, and the feeding cylinder 500 is vertically arranged at the middle position between the two slide rails 110. It can be understood that the pressing mechanism 600 acts vertically downward on the feeding cylinder 500 to push the injection molding material into the injection tube 300. The above layout of the feeding cylinder 500 and the injection tube 300 is conducive to force balance and can avoid tilting.

[0033] See also Figure 1 and Figure 4 In some embodiments of the present invention, support frames 250 are provided on both sides of the cylinder body 200 corresponding to the two slide rails 110, the slider 210 is installed on the support frame 250, the cylinder body 200 is horizontally penetrated with a first installation channel 220 for installing the injection tube 300, the cylinder body 200 is provided with a second installation channel 230 connected to the first installation channel 220 and extending upward, the feeding cylinder 500 is installed in the second installation channel 230, and the first installation channel 220 and the second installation channel 230 are both located in the middle position between the two support frames 250. Specifically, the first installation channel 220 and the second installation channel 230 of the cylinder body 200 are integrally formed on the cylinder body 200, and the injection tube 300 and the feeding cylinder 500 are respectively installed on the first installation channel 220 and the second installation channel 230, which is convenient for the production and manufacturing of the metering injection mechanism.

[0034] See also Figure 3 and Figure 4 In some embodiments of the present invention, the second installation channel 230 includes a feed port 231 connected to the upper side of the first installation channel 220 and a conical guide surface 232 formed on the outer peripheral edge of the feed port 231 and wide at the top and narrow at the bottom. The feed port 231 is in a long strip parallel to the first installation channel 220, and the lower end of the feeding cylinder 500 is sealed and connected to the outer peripheral edge of the conical guide surface 232. It can be understood that when the injection molding material in the feeding cylinder 500 is pushed downward by the pressing mechanism 600, the injection molding material can enter the feed port 231 along the conical guide surface 232, which can reduce the risk of jamming. Moreover, since the feed port 231 is parallel to the first installation channel 220, the injection molding material entering the feed port 231 from the conical guide surface 232 can flow along the length direction of the injection tube 300, further improving the smoothness of the injection molding material supply.

[0035] See also Figures 1 to 3 In some embodiments of the present invention, the pressing mechanism 600 includes two pressing cylinders 610 arranged vertically upward, the cylinder bodies of the two pressing cylinders 610 are respectively fixedly connected to the opposite sides of the second mounting channel 230, and a lifting beam 620 is connected between the upper ends of the output rods of the two pressing cylinders 610. The middle part of the lifting beam 620 is provided with a pressing rod 630 extending downward into the feeding cylinder 500, and the pressing rod 630 is provided with a cylinder piston 640 that cooperates with the inner circumferential wall of the feeding cylinder 500. The cylinder piston 640 is a cone that matches the conical guide surface 232 and is wide at the top and narrow at the bottom. It is understandable that when the output rods of the two pressing cylinders 610 are retracted, the lifting beam 620 is driven to move downward, thereby driving the cylinder piston 640 of the lower pressing rod 630 to move downward along the inner peripheral wall of the feeding cylinder 500, until the outer peripheral wall of the cylinder piston 640 is tightly matched with the conical guide surface 232, thereby pushing the injection molding material downward into the injection material tube 300 and forming a good sealing effect. Since the force of the ejection cylinder 710 driving the push rod 700 to extrude the injection molding material is relatively large, the pressing mechanism 600 must maintain a relatively large downward force to ensure that the injection molding material does not overflow, and the driving mode of the two pressing cylinders 610 and the lifting beam 620 can achieve a good driving force effect.

[0036] See also Figure 2 and Figure 4 In some embodiments of the present invention, the cylinder body 200 is provided with a third installation channel 240 on both sides of the first installation channel 220, the third installation channel 240 is arranged parallel to the slide rail 110 and is located directly above the corresponding support foot, the cylinder bodies of the two shooting cylinders 710 are respectively installed in the two third installation channels 240, the output rods of the two shooting cylinders 710 extend out of one end of the cylinder body 200 and a gantry 720 is connected between them, the two sides of the gantry 720 are respectively slidably arranged on the two slide rails 110, and the end of the push rod 700 away from the injection pipe 300 is fixedly connected to the middle of the gantry 720. It can be understood that the third installation channel 240 is used to install the shooting cylinder 710, and the two shooting cylinders 710 are distributed on both sides of the push rod 700, which is conducive to the push rod 700 receiving the thrust along its axial direction, and can avoid the problem of bulky volume caused by arranging the shooting cylinder 710 along the extension direction of the push rod 700.

[0037] See also Figure 3In some embodiments of the present invention, one end of the injection tube 300 has a discharge nozzle 310 extending from the cylinder body 200, and the discharge nozzle 310 is used to connect to the input port of the injection mold, and the other end of the injection tube 300 is provided with a scraper sleeve 320 that can contact the outer peripheral wall of the push rod 700 to prevent the injection material from overflowing. It can be understood that the relative sliding between the push rod 700 and the injection tube 300 may cause the injection material to overflow, and the provision of the scraper sleeve 320 can solve or improve this situation.

[0038] In some embodiments of the present invention, the outer peripheral wall of the push rod 700 is recessed along its radial direction to form a spiral groove, and the spiral groove is extended along the length direction of the push rod 700. The spiral groove and the scraper sleeve 320 can define a spiral gas channel that can only allow gas to be discharged outward. It should be noted that when the push rod 700 moves toward the discharge nozzle 310, the injection molding material is squeezed and discharged from the discharge nozzle 310. At the same time, since the interior of the injection tube 300 is in a sealed state, the gas between the injection molding materials cannot be discharged, resulting in bubbles in the injection molded product. The spiral gas channel can be used to make the gas discharge outward along the spiral gas channel away from the discharge nozzle 310, and the shape of the spiral gas channel makes it difficult for the injection molding material to be discharged with the gas, that is, the spiral gas channel can only discharge gas but not the injection molding material.

[0039] The present invention also discloses a method for extruding raw materials for injection molding, which uses a metering injection mechanism of any of the above technical solutions, wherein the injection material tube 300 is connected to an exhaust structure, and comprises the following steps: the moving cylinder 400 drives the output end of the injection material tube 300 to press against the input port of the injection mold, and injects the injection material into the feeding cylinder 500, and the amount of the injection material meets the injection mold for multiple injection molding. When the injection material in the injection material tube cannot meet the next injection molding, the ejection cylinder 710 drives the push rod 700 to move away from the injection mold so that the internal pipeline of the injection material tube 300 is connected to the feeding cylinder 500, and the pressing mechanism 600 drives the ejection rod 700 to move away from the injection mold. The injection molding material fills the internal pipe of the injection tube 300, and then the shooting cylinder 710 drives the push rod 700 to move close to the injection mold with a first thrust value to discharge the gas between the injection molding materials in the injection tube 300 from the exhaust structure to the outside, and then the shooting cylinder 710 drives the push rod 700 to move close to the injection mold for a preset stroke or a preset time with a second thrust value, and the second thrust value is greater than the first thrust value. Then the shooting cylinder 710 repeatedly drives the push rod 700 to move close to the injection mold for a preset stroke or a preset time with the second thrust value, thereby realizing multiple quantitative extrusion of the injection molding material. The above injection molding material extrusion method can meet the needs of multiple injections after one feeding, further improve the efficiency of the injection molding process, avoid spiral stirring of the injection molding material and break the glass fiber, and improve the structural strength of the injection molded product. Compared with the traditional method of the screw, the output dosage of the injection molding material is accurate, which is conducive to improving the quality stability of the injection molded product.

[0040] Among them, the exhaust structure is the spiral gas channel in the above embodiment. The first thrust value can be appropriately adjusted according to the hardness of different injection molding materials. For example, the gas gap of softer injection molding materials is generally smaller, and the first thrust value needs to be appropriately reduced at this time. The gas gap of harder injection molding materials is generally larger, and the first thrust value needs to be appropriately increased at this time. In some embodiments of the present invention, a pressure sensor can also be connected to the end of the spiral gas channel. By adjusting the size of the first thrust value, the ejection cylinder 710 drives the ejector rod 700 to press against the injection molding material with the first thrust value for a certain period of time. If the pressure sensor detects that the discharged gas is almost 0, the first thrust value can be set to the set value. If the pressure sensor detects that the discharged gas is greater than a certain flow rate, the first thrust value needs to be increased to meet the exhaust situation without excessive pressure and easily damaging the internal structure of the injection molding material.

[0041] The present invention also discloses an injection molding device, including a metering injection mechanism of any of the above technical solutions. The injection molding device can avoid the interruption of glass fibers by spiral stirring of the injection molding raw materials, improve the structural strength of the injection molding product, and, compared with the traditional method of the screw, the output dosage of the injection molding raw materials is accurate, and the production and processing efficiency is higher.

[0042] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A metering injection mechanism, characterized in that: include: Mounting seat (100); A material cylinder body (200) is slidably mounted on the mounting seat (100), and an injection pipe (300) is provided on the material cylinder body (200) and extends along the sliding direction thereof; A movable cylinder (400), one end of which is connected to the cylinder body (200) and the other end of which is fixedly mounted on the injection mold plate, and is used to drive the output end of the injection tube (300) to press against the input port of the injection mold; A feeding cylinder (500) is vertically arranged on the upper side wall of the injection pipe (300) and communicated with the interior of the injection pipe (300); A pressing mechanism (600) is lifted and lowered on the feeding cylinder (500) to press the injection molding material in the feeding cylinder (500) downward into the injection pipe (300); A push rod (700), one end of which is slidably disposed in the injection tube (300), and the other end of which is connected to a shot cylinder (710) that drives the push rod (700) to move close to the injection mold to output the injection material.

2. A metering injection mechanism according to claim 1, characterized in that: Two parallel slide rails (110) are arranged on the mounting seat (100), and the extension direction of the slide rails (110) is consistent with the sliding direction of the cylinder body (200). The cylinder body (200) has a slider (210) that slides on the two slide rails (110) respectively. The injection tube (300) is horizontally arranged at a middle position between the two slide rails (110), and the feeding cylinder (500) is vertically arranged at a middle position between the two slide rails (110).

3. A metering injection mechanism according to claim 2, characterized in that: Support frames (250) are provided on both sides of the cylinder body (200) corresponding to the two slide rails (110), and the slider (210) is installed on the support frame (250). The cylinder body (200) is horizontally penetrated by a first installation channel (220) for installing the injection tube (300). The cylinder body (200) is provided with a second installation channel (230) which is connected to the first installation channel (220) and extends upward. The feeding cylinder (500) is installed on the second installation channel (230). The first installation channel (220) and the second installation channel (230) are both located in the middle position between the two support frames (250).

4. A metering injection mechanism according to claim 3, characterized in that: The second installation channel (230) comprises a feed port (231) connected to the upper side of the first installation channel (220) and a conical guide surface (232) formed on the outer peripheral edge of the feed port (231) and wider at the top and narrower at the bottom. The feed port (231) is in the shape of a long strip parallel to the first installation channel (220), and the lower end of the feeding cylinder (500) is sealed and connected to the outer peripheral edge of the conical guide surface (232).

5. A metering injection mechanism according to claim 4, characterized in that: The pressing mechanism (600) includes two pressing cylinders (610) arranged vertically upward, the cylinder bodies of the two pressing cylinders (610) are respectively fixedly connected to the opposite sides of the second mounting channel (230), and a lifting beam (620) is connected between the upper ends of the output rods of the two pressing cylinders (610). The middle part of the lifting beam (620) is provided with a pressing rod (630) extending downward into the feeding cylinder (500), and the pressing rod (630) is provided with a cylinder piston (640) that matches the inner circumferential wall of the feeding cylinder (500), and the cylinder piston (640) is a cone that matches the conical guide surface (232) and is wide at the top and narrow at the bottom.

6. A metering injection mechanism according to claim 3, characterized in that: The cylinder body (200) is provided with a third mounting channel (240) on both sides of the first mounting channel (220), respectively. The third mounting channel (240) is arranged parallel to the slide rail (110) and is located directly above the corresponding supporting foot. The cylinder bodies of the two shooting cylinders (710) are respectively installed in the two third mounting channels (240), and a gantry (720) is connected between the output rods of the two shooting cylinders (710) extending out of one end of the cylinder body (200). Both sides of the gantry (720) are respectively slidably arranged on the two slide rails (110), and one end of the push rod (700) away from the injection pipe (300) is fixedly connected to the middle of the gantry (720).

7. A metering injection mechanism according to claim 1, characterized in that: One end of the injection tube (300) is provided with a discharge nozzle (310) extending from the cylinder body (200), and the discharge nozzle (310) is used to connect to the input port of the injection mold. The other end of the injection tube (300) is provided with a scraper sleeve (320) capable of contacting the outer peripheral wall of the push rod (700) to prevent the injection molding material from overflowing.

8. A metering injection mechanism according to claim 7, characterized in that: The outer peripheral wall of the push rod (700) is recessed along its radial direction to form a spiral groove, and the spiral groove is extended along the length direction of the push rod (700). A spiral gas channel that can only allow gas to be discharged outward can be defined between the spiral groove and the scraper sleeve (320).

9. A method for extruding raw materials for injection molding, using the metering injection mechanism according to any one of claims 1 to 8, wherein the injection pipe (300) is connected to an exhaust structure, characterized in that: The following steps are involved: The moving cylinder (400) drives the output end of the injection tube (300) to press against the input port of the injection mold, and injects the injection material into the feeding cylinder (500). The amount of the injection material is sufficient for the injection mold to perform multiple injections. The shooting cylinder (710) drives the push rod (700) to move away from the injection mold so that the internal pipeline of the injection tube (300) is connected to the feeding cylinder (500). The pressing mechanism (600) drives the injection material to fill the internal pipeline of the injection tube (300). Then, the shooting cylinder (710) pushes the first thrust value to push the push rod (700) away from the injection mold. The push rod (700) is driven to move closer to the injection mold to discharge the gas between the injection molding materials in the injection tube (300) from the exhaust structure, and then the shooting cylinder (710) drives the push rod (700) to move closer to the injection mold for a preset stroke or a preset time with a second thrust value, and the second thrust value is greater than the first thrust value. Then, the shooting cylinder (710) repeatedly drives the push rod (700) to move closer to the injection mold for a preset stroke or a preset time with the second thrust value, thereby realizing multiple quantitative extrusion of the injection molding materials.

10. An injection molding device, characterized in that: Comprising a metered injection mechanism according to any one of claims 1-8.

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