Injection molding machine with an injection molding mechanism

Abstract

The application relates to the technical field of plastic processing equipment, in particular to an injection mechanism for an injection molding machine, which comprises a base, a vertical supporting rod is installed on the upper surface of the base, a feeding pipe is installed on one side of the top of the supporting rod through a cross brace, an extrusion rod is slidably connected in the feeding pipe, and the up-and-down movement of the extrusion rod is realized through a linkage assembly connected with the extrusion rod; a notch is formed in one side of the upper part of the feeding pipe, and a feeding hopper is installed at the notch; a heating assembly is installed on the outer wall of the lower part of the feeding pipe; an injection nozzle is detachably connected to the bottom of the feeding pipe; a limiting plate is installed on the upper surface of the base, a recess for installing a mold set is arranged in the middle of the limiting plate, the bottom outlet of the injection nozzle corresponds to an injection port of the mold set, and a limiting piece for avoiding the movement of the mold set is arranged on one side of the limiting plate. The injection mechanism is simple and reliable in transmission, accurate in mold positioning, easy to replace, convenient to disassemble and assemble, safe to operate, capable of improving product quality and production efficiency, and reducing maintenance cost.

Description

Technical Field

[0001] This application relates to the field of plastic processing equipment technology, and in particular to an injection molding mechanism for an injection molding machine. Background Technology

[0002] In the plastics processing industry, injection molding machines are one of the core production equipment, and the injection molding mechanism, as a key component of the injection molding machine, directly affects the molding quality, production efficiency, and ease of operation of the product. Currently, the injection molding mechanisms commonly used in injection molding machines on the market have many shortcomings and are difficult to meet the needs of modern production.

[0003] First, the feeding and extrusion transmission structure of traditional injection molding mechanisms is complex. They often use motor drive in conjunction with multiple gears, chains and other transmission components to move the extrusion rod. This not only results in high manufacturing costs and a large footprint, but also makes the equipment prone to frequent failures due to wear of transmission components, increasing maintenance difficulty and costs. At the same time, the energy loss during the transmission process is significant, reducing energy utilization efficiency.

[0004] Secondly, regarding mold installation and fixing, the existing injection molding mechanism's mold positioning structure is not precise enough, and the fixing method is cumbersome. Most mechanisms only use simple clips or pressure plates to fix the mold. During the injection process, the mold is easily affected by the injection pressure and may shift, leading to quality problems such as flash and dimensional deviations in the product. Moreover, changing to different specifications of molds involves complicated procedures, consumes a lot of time, and seriously affects production efficiency.

[0005] In addition, as a key component connecting the injection molding mechanism and the mold, the injection nozzle in existing injection molding mechanisms is mostly connected to the feed tube by fixed welding or complex flange connection. When the injection nozzle wears out or needs to be replaced with a different specification injection nozzle according to different products, the disassembly and installation process is very difficult, requiring professional tools and technicians to operate, which increases production interruption time and maintenance costs. Utility Model Content

[0006] This utility model addresses the aforementioned problems in the existing technology by providing an injection molding mechanism for an injection molding machine.

[0007] The objective of this utility model is mainly achieved through the following solution:

[0008] An injection molding mechanism for an injection molding machine includes a base. A vertical support rod is installed on the rear side of the upper surface of the base. A feed tube is installed on one side of the top of the support rod via a horizontal brace. An extrusion rod is slidably connected inside the feed tube, and the extrusion rod can move up and down through a linkage assembly connected to the extrusion rod. A notch is opened on one side of the upper part of the feed tube, and a feed hopper is installed at the notch. A heating assembly is installed on the lower outer wall of the feed tube. An injection nozzle is detachably connected to the bottom of the feed tube. A limiting plate is installed on the upper surface of the base. A notch for installing a mold assembly is provided in the middle of the limiting plate. The bottom outlet of the injection nozzle corresponds to the injection port of the mold assembly, and a limiting component is provided on one side of the limiting plate to prevent the mold assembly from moving.

[0009] Preferably, the linkage assembly includes a first linkage rod and a second linkage rod, wherein the bottom of the first linkage rod is rotatably connected to the top of the support rod, the top of the first linkage rod is rotatably connected to one end of the second linkage rod, and the middle of the second linkage rod is rotatably connected to the top of the extrusion rod.

[0010] Preferably, mounting plates extend outward from both sides of the notch, the sidewall of the hopper is connected to the mounting plates, and the western outlet of the hopper corresponds to the bottom of the notch.

[0011] Preferably, the mold assembly includes two mating first molds and second molds, with an injection port formed between the tops of the first molds and the second molds, and the bottom of the injection nozzle extending into the injection port.

[0012] Preferably, the limiting plate has a U-shaped structure, and the first mold and the second mold are inserted into the recess of the limiting plate.

[0013] Preferably, the limiting member is a locking bolt, which is threaded into the threaded hole on the side wall of the limiting plate, and the threaded end of the locking bolt can extend into the recess and abut against the side wall of the first mold or the second mold.

[0014] Preferably, the heating assembly includes multiple annular heating coils, which are spaced apart along the length of the feed tube, and the inner wall of the heating coils is in contact with the outer wall of the feed tube.

[0015] Preferably, the injection nozzle and the bottom of the feed tube are detachably connected by a threaded structure, and a high-temperature resistant sealing gasket is provided at the connection between the injection nozzle and the feed tube.

[0016] Preferably, the end of the second linkage rod away from the first linkage rod is provided as a grip portion, and the surface of the grip portion is provided with anti-slip texture.

[0017] In summary, compared with the prior art, the present invention has the following beneficial technical effects:

[0018] (1) This utility model realizes the up and down movement of the extrusion rod through the linkage assembly composed of the first linkage rod and the second linkage rod, which replaces the traditional complex motor and gear transmission system, reduces the number of transmission parts, and lowers the manufacturing cost; at the same time, the linkage transmission structure is not easy to wear, has a low failure rate, and only requires simple inspection and lubrication of the linkage connection during subsequent maintenance, which greatly reduces the maintenance difficulty and cost, and the energy loss during transmission is small and the energy utilization rate is high.

[0019] (2) The U-shaped limiting plate in this utility model can play a good circumferential limiting role for the first mold and the second mold. With the tight fixing of the limiting parts, it can effectively prevent the mold assembly from shifting during the injection process, ensure the accurate positioning of the mold, thereby ensuring the dimensional accuracy of the injection molded product and reducing quality problems such as flash. In addition, the mold can be quickly fixed and loosened by rotating the locking bolt. When changing molds of different specifications, the operation is simple and there is no need for complicated disassembly steps, which significantly shortens the production preparation time and improves the production efficiency.

[0020] (3) In this utility model, the injection nozzle and the feed tube are connected by a threaded structure. Operators do not need professional tools and can complete the disassembly and installation of the injection nozzle by simply rotating it manually. When the injection nozzle is worn or needs to be replaced with different specifications to adapt to different products, the operation is very convenient, reducing equipment downtime and maintenance time and reducing maintenance costs. At the same time, the high temperature resistant sealing gasket at the connection can effectively prevent the leakage of high temperature raw materials, ensuring the sealing and safety of the injection molding process. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 This is the front view of this utility model;

[0023] Figure 3 This is an exploded view of the present invention.

[0024] Reference numerals in the attached drawings: 1-base; 2-support rod; 3-cross brace; 4-feed tube; 5-extrusion rod; 6-notch; 7-feed hopper; 8-injection nozzle; 9-limiting plate; 10-notch; 11-limiting component; 12-first linkage rod; 13-second linkage rod; 14-mounting plate; 15-first mold; 16-second mold; 17-injection port; 18-screw hole; 19-annular heating coil. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0026] like Figure 1-3 As shown, this utility model discloses a technical solution for an injection molding machine, including a base 1. The base 1 is made of cast iron and has good load-bearing capacity and stability. Its size is set according to actual production needs. A vertical support rod 2 is bolted to the rear side of the upper surface of the base 1. The support rod 2 is made of stainless steel to ensure that it has sufficient support strength. A cross brace 3 is fixedly connected to the top side of the support rod 2 by welding. The cross brace 3 is also made of stainless steel. The end of the cross brace 3 away from the support rod 2 is fixedly connected to the feed tube 4 by bolts. The feed tube 4 is a cylindrical tube made of stainless steel, and the axis of the feed tube 4 is set in a vertical direction.

[0027] Specifically, an extrusion rod 5 is slidably connected inside the feeding tube 4. The extrusion rod 5 is made of high-strength alloy steel, and its diameter is adapted to the inner diameter of the feeding tube 4. The extrusion rod 5 moves up and down through a linkage assembly connected to it. Specifically, the linkage assembly includes a first linkage rod 12 and a second linkage rod 13. Both the first linkage rod 12 and the second linkage rod 13 are made of stainless steel. The bottom of the first linkage rod 12 is rotatably connected to the top of the support rod 2 through a pin. One end of the second linkage rod 13 is rotatably connected to the top of the first linkage rod 12 through a pin, and the middle part is rotatably connected to the top of the extrusion rod 5 through a pin. The end of the second linkage rod 13 away from the first linkage rod 12 is provided as a grip, and its surface is provided with diamond-shaped anti-slip texture.

[0028] Specifically, a notch 6 is provided on one side of the upper part of the feeding pipe 4, and mounting plates 14 extend outward from both sides of the notch 6. The mounting plates 14 are made of stainless steel and are integrally formed with the feeding pipe 4. There are 4 mounting holes on the mounting plates 14. A feeding hopper 7 is installed at the notch 6. The feeding hopper 7 is made of stainless steel. Its upper part is funnel-shaped and its lower part is a cylindrical discharge pipe. The diameter of the discharge pipe is adapted to the width of the notch 6. The side wall of the feeding hopper 7 is connected to the mounting holes of the mounting plate 14 by bolts, and the bottom outlet of the feeding hopper 7 is aligned with the bottom of the notch 6 to ensure that the raw materials can smoothly enter the feeding pipe 4.

[0029] Specifically, a heating assembly is installed on the lower outer wall of the feed tube 4. The heating assembly includes three annular heating coils 19, each using electric heating with a power of 1500W, which are commercially available. The inner diameter of the heating coils is compatible with the outer diameter of the feed tube 4. The three heating coils are spaced apart along the length of the feed tube 4, and their inner walls are tightly fitted to the outer walls of the feed tube 4. The heating coils are fixed to the feed tube 4 by clamps. Various compatible models of the annular heating coils 19 can be selected, and the specific selection depends on the size of the feed tube and the heating requirements in actual production. Taking common injection molding machine heating coil products as an example, if the outer diameter of the feed tube is 9cm, the inner diameter of the compatible heating coil should be 9cm. In this case, the following models can be considered: stainless steel heating coils from TKG, ceramic heating coils from TR-TC JR Q, and brass strip heaters from ZX YA, etc. Their specific structures, principles, and control methods are not within the scope of protection of this application and will not be elaborated here.

[0030] Specifically, the bottom of the feed tube 4 is detachably connected to an injection nozzle 8 via a threaded structure. The injection nozzle 8 is made of high-temperature resistant alloy steel, and its upper part is a connecting part with an internal thread that matches the external thread at the bottom of the feed tube 4. The lower part of the injection nozzle 8 is a tapered discharge port, and the diameter of the discharge port is set according to product requirements. A high-temperature resistant sealing gasket is provided at the connection between the injection nozzle 8 and the feed tube 4. The sealing gasket is made of graphite material and has a thickness of 2mm to ensure the sealing of the connection.

[0031] Specifically, a limiting plate 9 is fixedly installed on the upper surface of the base 1 by bolts. The limiting plate 9 is made of stainless steel and has a U-shaped structure. The opening of the U-shaped structure faces one side, and the width of the recess 10 in the middle is adapted to the width of the mold assembly. The mold assembly includes two cooperating first molds 15 and second molds 16. Both the first molds 15 and the second molds 16 are made of mold steel. After the two molds are closed, a product cavity is formed inside. An injection port 17 is formed between the tops. The diameter of the injection port 17 is adapted to the diameter of the discharge port at the bottom of the injection nozzle 8. The bottom of the injection nozzle 8 extends into the injection port 17.

[0032] Specifically, a limiting member 11 is provided on one side of the limiting plate 9 to prevent the mold assembly from moving. The limiting member 11 is a locking bolt, and the locking bolt is of type M12×50. A screw hole 18 is provided on the side wall of the limiting plate 9. The specification of the screw hole 18 is compatible with the locking bolt. The locking bolt is threaded into the screw hole 18, and the threaded end of the locking bolt can extend into the recess 10 and abut against the side wall of the second mold 16. The mold assembly can be fixed by rotating the locking bolt.

[0033] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An injection molding mechanism for an injection molding machine, comprising a base (1), characterized in that: A vertical support rod (2) is installed on the rear side of the upper surface of the base (1). A feed tube (4) is installed on one side of the top of the support rod (2) via a cross brace (3). An extrusion rod (5) is slidably connected inside the feed tube (4), and the extrusion rod (5) moves up and down through a linkage assembly connected to the extrusion rod (5). A notch (6) is opened on one side of the upper part of the feed tube (4), and a feed hopper (7) is installed at the notch (6). A heating assembly is installed on the lower outer wall of the feed tube (4). An injection nozzle (8) is detachably connected to the bottom of the feed tube (4). A limiting plate (9) is installed on the upper surface of the base (1). A notch (10) for installing a mold assembly is provided in the middle of the limiting plate (9). The bottom outlet of the injection nozzle (8) corresponds to the injection port (17) of the mold assembly. A limiting component (11) is provided on one side of the limiting plate (9) to prevent the mold assembly from moving.

2. The injection molding mechanism for an injection molding machine according to claim 1, characterized in that: The linkage assembly includes a first linkage rod (12) and a second linkage rod (13). The bottom of the first linkage rod (12) is rotatably connected to the top of the support rod (2). The top of the first linkage rod (12) is rotatably connected to one end of the second linkage rod (13). The middle part of the second linkage rod (13) is rotatably connected to the top of the extrusion rod (5).

3. The injection molding mechanism for an injection molding machine according to claim 1, characterized in that: Mounting plates (14) extend outward from both sides of the notch (6). The side wall of the hopper (7) is connected to the mounting plates (14), and the western outlet of the hopper (7) corresponds to the bottom of the notch (6).

4. The injection molding mechanism for an injection molding machine according to claim 1, characterized in that: The mold assembly includes two cooperating first molds (15) and second molds (16), with an injection port (17) formed between the tops of the first molds (15) and the second molds (16), and the bottom of the injection nozzle (8) extending into the injection port (17).

5. The injection molding mechanism for an injection molding machine according to claim 4, characterized in that: The limiting plate (9) has a U-shaped structure, and the first mold (15) and the second mold (16) are inserted into the recess (10) of the limiting plate (9).

6. The injection molding mechanism for an injection molding machine according to claim 5, characterized in that: The limiting member (11) is a locking bolt, which is threaded into the side wall screw hole (18) of the limiting plate (9), and the threaded end of the locking bolt can extend into the recess (10) and abut against the side wall of the first mold (15) or the second mold (16).

7. The injection molding mechanism for an injection molding machine according to claim 1, characterized in that: The heating assembly includes multiple annular heating coils (19), which are spaced apart along the length of the feed tube (4), and the inner sidewall of the heating coil is attached to the outer sidewall of the feed tube (4).

8. The injection molding mechanism for an injection molding machine according to claim 1, characterized in that: The injection nozzle (8) and the bottom of the feed tube (4) are detachably connected by a threaded structure, and a high-temperature resistant sealing gasket is provided at the connection between the injection nozzle (8) and the feed tube (4).

9. The injection molding mechanism for an injection molding machine according to claim 2, characterized in that: The end of the second linkage rod (13) away from the first linkage rod (12) is provided as a grip part, and the surface of the grip part is provided with anti-slip texture.

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