A plastic injection molding machine
By combining a servo motor-driven bidirectional threaded rod and a guide hydraulic rod, the problem of cumbersome mold changing in traditional injection molding machines is solved, enabling rapid and accurate mold alignment and automated mold changing, thereby improving production efficiency and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING YUFENGHE TECH CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-05-26
AI Technical Summary
Traditional injection molding machines involve cumbersome and time-consuming mold changes, making it difficult to quickly switch between producing products of different specifications or types.
A servo motor drives a bidirectional threaded rod, which in turn drives a clamping block to engage with a clamping slot on the fixed mold via a clamping plate. This ensures accurate alignment between the fixed mold and the base plate. Combined with the design of guide rods and hydraulic rods, it enables accurate opening and closing of the moving mold and automated mold replacement.
It enables rapid and accurate mold alignment and stable clamping, improves the convenience of mold replacement and production efficiency, and ensures the dimensional accuracy and shape consistency of molded products.
Smart Images
Figure CN224275946U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection molding machine technology, and in particular to a plastic injection molding machine. Background Technology
[0002] A plastic injection molding machine, or injection molding machine for short, is a machine that uses pressure to inject thermoplastic or thermosetting plastic into a closed mold through a nozzle. After cooling and solidification, the mold is opened to obtain the product of the desired shape. It is an important piece of equipment in the plastics processing industry and can be used to produce various plastic products, such as toys, appliance casings, and automotive parts. An injection molding machine is usually composed of an injection system, a mold clamping system, a hydraulic transmission system, and an electrical control system.
[0003] Because traditional injection molding machines typically use fixed molds that need to be fixed to the injection molding machine template by means of bolts, pressure plates, etc., changing molds is cumbersome and time-consuming, usually taking several hours or even longer, making it difficult to quickly switch to producing products of different specifications or types.
[0004] Therefore, those skilled in the art have provided a plastic injection molding machine to solve the problems mentioned in the background art. Utility Model Content
[0005] The purpose of this invention is to address the shortcomings of existing technologies and provide a plastic injection molding machine. A servo motor drives a bidirectional threaded rod, causing the clamping plate to engage with the locking block in the locking groove on the fixed mold. This ensures accurate alignment between the fixed mold and the base plate, preventing mold displacement during injection. The automated design makes mold replacement more convenient and faster, improving production efficiency.
[0006] To achieve the above objectives, this utility model provides a plastic injection molding machine, including a base plate, a top plate, and a mounting plate. A protective shell is fixedly connected to the middle of one side of the outer wall of the base plate. A servo motor is installed inside the protective shell. A mounting groove is opened in the middle of the upper surface of the base plate. A bidirectional threaded rod is installed inside the mounting groove. The output end of the servo motor passes through the base plate to the inside of the mounting groove and is fixedly connected to the middle of one side of the bidirectional threaded rod. Clamping plates are threadedly connected to both sides of the outer wall of the protective shell. Multiple snap-fit blocks are fixedly connected to the outer walls of adjacent sides of the clamping plates. A fixed mold is tightly fitted to the upper surface of the base plate. Multiple snap-fit grooves are opened on the outer walls of both sides of the lower end of the fixed mold. The outer walls of the snap-fit blocks are snap-fitted into the inner walls of the snap-fit grooves.
[0007] The above technical solution uses a servo motor to drive a bidirectional threaded rod, which causes the clamping plate to engage with the locking block on the fixed mold, ensuring accurate alignment between the fixed mold and the base plate. This design ensures accurate alignment between the fixed mold and the base plate, preventing displacement of the mold during injection. The automated design makes mold replacement more convenient and faster, improving production efficiency.
[0008] Furthermore, guide rods are fixedly connected to the four corners of the upper surface of the base plate, and the upper ends of the guide rods are fixedly connected to the four corners of the lower surface of the top plate. A hydraulic rod is fixedly connected to the middle of the upper surface of the top plate. A moving mold is fixedly connected to the lower surface of the mounting plate. A connecting pipe is connected through the middle of the upper surface of the mounting plate. The lower end of the connecting pipe is connected through the interior of the moving mold. The output end of the hydraulic rod passes through the top plate to the lower end of the top plate and is fixedly connected to the middle of the upper surface of the connecting pipe. The inner walls of the four corners of the mounting plate are slidably fitted with the outer walls of the guide rods.
[0009] The above technical solution provides accurate linear guidance between the bottom plate and the top plate through the guide rod. The inner wall of the four corners of the mounting plate slides and fits against the outer wall of the guide rod, ensuring that the moving mold can move accurately up and down along the guide rod during the mold opening and closing process, avoiding lateral offset and misalignment. In addition, the hydraulic rod serves as a power source, and its output end is directly connected to the mounting plate, which can provide a smooth and controllable driving force to realize the accurate opening and closing action of the moving mold.
[0010] Furthermore, a material cylinder is fixedly connected to the middle of the other side of the upper surface of the top plate, and a pump is fixedly connected to the upper surface of the material cylinder. The suction port of the pump is connected to the inside of the material cylinder through a pipe, and a corrugated hose is connected to the discharge port of the pump. The lower end of the corrugated hose is connected to the inside of the connecting pipe.
[0011] Through the above technical solution, by using a pump to extract molten plastic from the barrel and transport it to the mold, the use of a corrugated hose provides a flexible connection, which allows the connection between the injection head and the connecting pipe 301 on the moving mold to move within a certain range.
[0012] Furthermore, positioning rods are fixedly connected to the four corners of the lower surface of the mounting plate, and positioning holes are opened at the four corners of the upper surface of the fixed mold. The outer walls of the positioning rods slide against the inner walls of the positioning holes.
[0013] The above technical solution ensures that the moving mold and the fixed mold can be accurately and quickly aligned when the mold is closed by inserting the positioning rod into the positioning hole. This avoids damage to the mold due to misalignment and ensures the dimensional accuracy and shape consistency of the final molded product.
[0014] Furthermore, a PLC control panel is fixedly connected to the outer wall of the front end of the guide rod on one side of the front end;
[0015] The above technical solution uses a PLC control panel to control the operation of the entire device.
[0016] Furthermore, one side of the servo motor is fixedly connected to the inner wall of one side of the protective shell;
[0017] The above technical solution uses a protective shell to protect the internal servo motor from external factors.
[0018] Furthermore, the other side of the bidirectional threaded rod is rotatably connected to the middle of the other side of the mounting groove, the outer wall of the lower end of the clamping plate is slidably attached to the inner wall of the mounting groove, and the outer walls of the adjacent two sides of the upper end of the clamping plate are tightly attached to the outer walls of the lower end of the fixed mold.
[0019] The above technical solution and design make the clamping plate more stable in clamping the fixed mold.
[0020] This utility model has the following beneficial effects:
[0021] This utility model proposes a plastic injection molding machine that uses a servo motor to drive a bidirectional threaded rod, causing the clamping plate to engage with the locking block on the fixed mold, ensuring accurate alignment between the fixed mold and the base plate. This design ensures accurate alignment between the fixed mold and the base plate, preventing displacement of the mold during injection. The automated design makes mold replacement more convenient and faster, improving production efficiency. Attached Figure Description
[0022] Figure 1 This is an isometric view of a plastic injection molding machine proposed in this utility model;
[0023] Figure 2 This is a front view of a plastic injection molding machine proposed in this utility model;
[0024] Figure 3 This is an exploded view of a portion of the structure of a plastic injection molding machine proposed in this utility model;
[0025] Figure 4 This is an isometric view of a portion of the structure of a plastic injection molding machine proposed in this utility model.
[0026] Explanation of reference numerals in the attached figures:
[0027] 1. Base plate; 101. Protective shell; 102. Mounting slot; 103. Guide rod; 104. PLC control panel; 2. Top plate; 201. Hydraulic rod; 3. Mounting plate; 301. Connecting pipe; 302. Moving mold; 303. Positioning rod; 4. Fixed mold; 401. Positioning hole; 402. Snap-fit groove; 5. Servo motor; 501. Bidirectional threaded rod; 502. Clamping plate; 503. Snap-fit block; 6. Material cylinder; 601. Pump; 602. Corrugated hose. Detailed Implementation
[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0029] Reference Figure 1 and Figure 3 This utility model provides a specific embodiment: a plastic injection molding machine, including a base plate 1, a top plate 2, and a mounting plate 3. A protective shell 101 is fixedly connected to the middle of one side of the outer wall of the base plate 1. A servo motor 5 is installed inside the protective shell 101. A mounting groove 102 is opened in the middle of the upper surface of the base plate 1. A bidirectional threaded rod 501 is installed inside the mounting groove 102. The output end of the servo motor 5 passes through the base plate 1 to the inside of the mounting groove 102 and is fixedly connected to the middle of one side of the bidirectional threaded rod 501. Clamping plates 502 are threadedly connected to both sides of the outer wall of the protective shell 101. The outer walls of adjacent sides of the clamping plates 502 are fixed. Multiple snap-fit blocks 503 are connected. The upper surface of the base plate 1 is tightly fitted with the fixed mold 4. Multiple snap-fit grooves 402 are opened on the outer walls of both sides of the lower end of the fixed mold 4. The outer walls of the snap-fit blocks 503 are engaged with the inner walls of the snap-fit grooves 402. The bidirectional threaded rod 501 is driven by the servo motor 5, so that the clamping plate 502 drives the snap-fit blocks 503 to engage with the snap-fit grooves 402 on the fixed mold 4, ensuring accurate alignment between the fixed mold 4 and the base plate 1. This design ensures accurate alignment between the fixed mold 4 and the base plate 1, preventing displacement of the mold during injection. The automated design makes the replacement of the fixed mold 4 more convenient and faster, improving production efficiency.
[0030] Reference Figure 1 , Figure 3 and Figure 4Guide rods 103 are fixedly connected to the four corners of the upper surface of the base plate 1. The upper ends of the guide rods 103 are fixedly connected to the four corners of the lower surface of the top plate 2. A hydraulic rod 201 is fixedly connected to the middle of the upper surface of the top plate 2. A moving mold 302 is fixedly connected to the lower surface of the mounting plate 3. A connecting pipe 301 is connected through the middle of the upper surface of the mounting plate 3. The lower end of the connecting pipe 301 is connected through the interior of the moving mold 302. The output end of the hydraulic rod 201 passes through the top plate 2 to the lower end of the top plate 2 and is fixedly connected to the middle of the upper surface of the connecting pipe 301. The inner walls of the four corners of the mounting plate 3 slide against the outer walls of the guide rods 103. The guide rods 103 provide accurate linear guidance between the base plate 1 and the top plate 2. The sliding contact between the inner walls of the four corners of the mounting plate 3 and the outer walls of the guide rods 103 ensures that the moving mold 302 is properly aligned during mold opening and closing. During the process, it can move accurately up and down along the guide rod 103, avoiding lateral offset and misalignment. In addition, the hydraulic rod 201 serves as a power source, and its output end is directly connected to the mounting plate 3, which can provide a stable and controllable driving force to realize the accurate opening and closing action of the moving mold 302. A material cylinder 6 is fixedly connected to the middle of the other side of the upper surface of the top plate 2. A pump 601 is fixedly connected to the upper surface of the material cylinder 6. The suction port of the pump 601 is connected to the inside of the material cylinder 6 through a pipe. The discharge port of the pump 601 is connected to a corrugated hose 602. The lower end of the corrugated hose 602 is connected to the inside of the connecting pipe 301. The pump 601 is used to draw molten plastic from the material cylinder 6 and transport it to the mold. The use of the corrugated hose 602 provides a flexible connection, which allows the connection between the injection head and the connecting pipe 301 on the moving mold 302 to move within a certain range.
[0031] Reference Figure 1 , Figure 2 and Figure 4Positioning rods 303 are fixedly connected to the four corners of the lower surface of the mounting plate 3, and positioning holes 401 are opened at the four corners of the upper surface of the fixed mold 4. The outer wall of the positioning rods 303 slides against the inner wall of the positioning holes 401. By inserting the positioning rods 303 into the positioning holes 401, it is ensured that the moving mold 302 and the fixed mold 4 can be accurately and quickly aligned when the mold is closed. This avoids damage to the mold due to misalignment and ensures the dimensional accuracy and shape consistency of the final molded product. A PLC control panel 104 is fixedly connected to the outer wall of the front end of the guide rod 103 on one side. The control panel 104 is used to control the operation of the entire device. One side of the servo motor 5 is fixedly connected to the inner wall of the protective shell 101. The protective shell 101 is used to protect the internal servo motor 5 from external factors. The other side of the bidirectional threaded rod 501 is rotatably connected to the middle of the other side of the mounting groove 102. The outer wall of the lower end of the clamping plate 502 is slidably attached to the inner wall of the mounting groove 102. The outer walls of the adjacent two sides of the upper end of the clamping plate 502 are tightly attached to the outer walls of the lower two sides of the fixed mold 4. This design makes the clamping plate 502 clamp the fixed mold 4 more stably.
[0032] Working principle: First, the moving mold 302 and the fixed mold 4 achieve rapid and preliminary alignment through the positioning rod 303 and the positioning hole 401. Then, the servo motor 5 drives the bidirectional threaded rod 501 to rotate, causing the clamping plate 502 to move downward. The snap-fit block 503 on the clamping plate 502 precisely engages with the snap-fit groove 402 on the fixed mold 4, ensuring accurate alignment and stable clamping of the fixed mold 4 and the base plate 1. At the same time, the lower end of the clamping plate 502 slides against the inner wall of the mounting groove 102, and the upper end engages with the fixed mold 4. The outer walls on both sides of the lower end fit tightly together, further enhancing the stability of the clamping. Then, the hydraulic rod 201 serves as the power source, and its output end pushes the mounting plate 3 downward. The mounting plate 3 slides against the outer wall of the guide rod 103 through the inner wall at the four corners, ensuring that the moving mold 302 moves accurately downward along the guide rod 103, avoiding lateral offset and misalignment. The moving mold 302 and the fixed mold 4 gradually close, finally achieving complete mold closing. After mold closing, the plastic raw material in the barrel 6 is heated and melted. Pump 601 draws molten plastic from barrel 6 and delivers it to injection head through corrugated hose 602. The flexible connection of corrugated hose 602 allows the injection head and connecting pipe 301 on moving mold 302 to move within a certain range, ensuring the reliability of the connection. Molten plastic enters the gate of moving mold 302 through connecting pipe 301 and fills the mold cavity. The molten plastic in the mold is cooled and solidified by the cooling system to form the desired plastic product. Subsequently, hydraulic rod 201 retracts, pulling mounting plate 3 downward, and moving mold 302 downward, separating from fixed mold 4. If mold replacement is required, servo motor 5 can reverse drive bidirectional threaded rod 501 to move clamping plate 502 upward, thereby releasing the clamping block 503 from the fixed mold 4. The operation of the entire device is controlled by PLC control panel 104 to achieve automated operation. Protective shell 101 is used to protect the internal servo motor 5 from external factors and ensure the normal operation of the equipment.
[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A plastic injection molding machine, comprising a base plate (1), a top plate (2), and a mounting plate (3), characterized in that: A protective shell (101) is fixedly connected to the middle of one side of the outer wall of the base plate (1). A servo motor (5) is installed inside the protective shell (101). An installation groove (102) is opened in the middle of the upper surface of the base plate (1). A bidirectional threaded rod (501) is installed inside the installation groove (102). The output end of the servo motor (5) passes through the base plate (1) to the inside of the installation groove (102) and is fixedly connected to the middle of one side of the bidirectional threaded rod (501). Clamping plates (502) are threadedly connected to both sides of the outer wall of the protective shell (101). Multiple snap-fit blocks (503) are fixedly connected to the outer walls of adjacent sides of the clamping plates (502). A fixed mold (4) is tightly attached to the upper surface of the base plate (1). Multiple snap-fit grooves (402) are opened on the outer walls of both sides of the lower end of the fixed mold (4). The outer walls of the snap-fit blocks (503) are snap-fitted with the inner walls of the snap-fit grooves (402).
2. The plastic injection molding machine according to claim 1, characterized in that: Guide rods (103) are fixedly connected to the four corners of the upper surface of the base plate (1). The upper ends of the guide rods (103) are fixedly connected to the four corners of the lower surface of the top plate (2). A hydraulic rod (201) is fixedly connected to the middle of the upper surface of the top plate (2). A moving mold (302) is fixedly connected to the lower surface of the mounting plate (3). A connecting pipe (301) is connected through the middle of the upper surface of the mounting plate (3). The lower end of the connecting pipe (301) is connected through the interior of the moving mold (302). The output end of the hydraulic rod (201) passes through the top plate (2) to the lower end of the top plate (2) and is fixedly connected to the middle of the upper surface of the connecting pipe (301). The inner walls of the four corners of the mounting plate (3) are slidably attached to the outer walls of the guide rods (103).
3. A plastic injection molding machine according to claim 2, characterized in that: A material cylinder (6) is fixedly connected to the middle of the other side of the upper surface of the top plate (2). A pump (601) is fixedly connected to the upper surface of the material cylinder (6). The suction port of the pump (601) is connected to the inside of the material cylinder (6) through a pipe. A corrugated hose (602) is connected to the discharge port of the pump (601). The lower end of the corrugated hose (602) is connected to the inside of the connecting pipe (301).
4. A plastic injection molding machine according to claim 2, characterized in that: Positioning rods (303) are fixedly connected to the four corners of the lower surface of the mounting plate (3), and positioning holes (401) are opened at the four corners of the upper surface of the fixed mold (4). The outer wall of the positioning rod (303) slides against the inner wall of the positioning hole (401).
5. A plastic injection molding machine according to claim 2, characterized in that: A PLC control panel (104) is fixedly connected to the outer wall of the front end of the guide rod (103) on one side of the front end.
6. A plastic injection molding machine according to claim 1, characterized in that: One side of the servo motor (5) is fixedly connected to the inner wall of one side of the protective shell (101).
7. A plastic injection molding machine according to claim 1, characterized in that: The other side of the bidirectional threaded rod (501) is rotatably connected to the middle of the other side of the mounting groove (102). The outer wall of the lower end of the clamping plate (502) is slidably attached to the inner wall of the mounting groove (102). The outer walls of the upper end of the clamping plate (502) on both adjacent sides are tightly attached to the outer walls of the lower end of the fixed mold (4).