Positioning and locking mechanism of double-color injection mold
By using locking gears and racks in a mechanical structure design, automatic positioning and locking of two-color injection molds is achieved, solving the problems of high labor costs and complex equipment in existing technologies, improving the stability and precision of the mold, and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-03-31
AI Technical Summary
Existing two-color injection molds rely on manual operation or electric equipment for positioning and locking, resulting in high labor costs, low efficiency, high equipment costs, and complex maintenance, which affects product accuracy and quality.
The mechanical structure design includes locking gears, locking racks, and hydraulic cylinders, which achieve automatic positioning and locking through mechanical cooperation, reducing manpower and power consumption, and enhancing mold stability and precision.
It achieves automatic positioning and locking without the need for manpower and electricity, reduces production costs, improves mold stability and precision, and conforms to the concept of green production.
Smart Images
Figure CN224060331U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of injection molds, and particularly to a positioning and locking mechanism for a two-color injection mold. Background Technique
[0002] Two-color injection molds are widely used in the production of plastic products. They can inject two different colors or materials of plastic into the same product, greatly enriching the appearance and performance of plastic products.
[0003] However, currently, most two-color injection molds rely mainly on additional manual operations or electric auxiliary equipment for positioning and locking. The manual positioning and locking method not only consumes manpower but also has low efficiency. It requires a high level of technical proficiency from the operators.稍有不慎便会导致定位偏差,影响产品的尺寸精度与外观质量。而电动定位锁紧虽在一定程度上提高了效率,但设备成本高昂,且需要复杂的电气控制系统支持,增加了维护难度与运行成本。
[0004] Therefore, we designed a positioning and locking mechanism for a two-color injection mold to solve the above problems. Content of the Utility Model
[0005] The purpose of the utility model is to provide a positioning and locking mechanism for a two-color injection mold to solve the problems raised in the above background technique.
[0006] To solve the above technical problems, a positioning and locking mechanism for a two-color injection mold provided by the utility model includes a base. A fixed mold is fixedly connected to the bottom plate of the base. A moving mold is movably arranged at the top end of the fixed mold. A first locking rack is fixedly connected to the bottom end of the moving mold. Semicircular grooves are opened on the side walls where the fixed mold and the moving mold contact each other. A rotating shaft is fixedly connected in the semicircular groove of the fixed mold. A locking gear is rotatably connected to the rotating shaft. Rectangular grooves are opened at both ends of the locking gear. A second locking rack is arranged in one of the rectangular grooves. One side of the second locking rack is meshed with the locking gear, and the other side is slidably connected in the rectangular groove. The first locking rack is adapted to the rectangular groove on the side away from the second locking rack.
[0007] Furthermore, a rectangular groove is opened at the bottom end of the moving mold, and the second locking rack is adapted to the rectangular groove at the bottom end of the moving mold.
[0008] Furthermore, the base is in the shape of an "I" with two horizontal plates on the top and bottom and a side plate in the middle.
[0009] Furthermore, the number of the locking gears, the first locking racks and the second locking racks is four groups, and the four groups of locking gears, first locking racks and second locking racks are respectively arranged on the four contact surfaces at the top end of the fixed mold and the bottom end of the moving mold.
[0010] Furthermore, a hydraulic cylinder is fixedly connected to the top plate of the base, and the bottom drive shaft of the hydraulic cylinder passes through the top plate of the base and is fixedly connected to the moving mold.
[0011] Furthermore, positioning rods are fixedly connected to the four corners of the top of the moving mold. The top of the positioning rods is movably connected to the top plate of the base, and the bottom of the positioning rods penetrates the moving mold and extends to the bottom of the moving mold.
[0012] Furthermore, positioning holes are provided at the four corners of the top of the fixed mold, and the positioning rod is adapted to the positioning holes.
[0013] Furthermore, a positioning block is fixedly connected to the top end of the positioning rod, and the shape of the positioning block is larger than that of the positioning rod.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] In this invention, during the mold closing process of the moving mold to the fixed mold, the positioning and locking actions are automatically completed by the ingenious cooperation between the mechanical structures. This eliminates the need for additional manpower and power resources, significantly reducing labor costs and energy consumption in the production process, improving energy efficiency, and aligning with the concept of green production. Attached Figure Description
[0016] Figure 1 This is a three-dimensional structural diagram of the exterior of this utility model;
[0017] Figure 2 This is a front view of the external structure of this utility model;
[0018] Figure 3 This is a schematic diagram of the structure of the present invention in the mold-closed state;
[0019] Figure 4 This is a cross-sectional structural diagram of the fixed mold and the moving mold during mold closing in this utility model.
[0020] In the diagram: 1. Base; 2. Fixed mold; 3. Moving mold; 4. Rotating shaft; 5. Locking gear; 6. First locking rack; 7. Second locking rack; 8. Semicircular groove; 9. Rectangular groove; 10. Hydraulic cylinder; 11. Positioning rod; 12. Positioning hole; 13. Positioning block. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] Please see Figures 1-4 This utility model provides a technical solution: a positioning and locking mechanism for a two-color injection mold, including a base 1. The base 1 is shaped like an "I" with two horizontal plates on the top and bottom and a side plate in the middle. A fixed mold 2 is fixedly connected to the bottom plate of the base 1. A movable mold 3 is movably arranged at the top of the fixed mold 2. A first locking rack 6 is fixedly connected to the bottom of the movable mold 3. Semicircular grooves 8 are opened on the side walls of the fixed mold 2 and the movable mold 3 that are in contact. A rotating shaft 4 is fixedly connected in the semicircular groove 8 on the fixed mold 2. A locking gear 5 is rotatably connected to the rotating shaft 4. Rectangular grooves 9 are opened at both ends of the locking gear 5. A second locking rack 7 is arranged in one rectangular groove 9. One side of the second locking rack 7 is meshed with the locking gear 5, and the other side is slidably connected in the rectangular groove 9. The first locking rack 6 is adapted to the rectangular groove 9 on the side away from the second locking rack 7. A rectangular groove 9 is also opened at the bottom of the movable mold 3. The second locking rack 7 is adapted to the rectangular groove 9 at the bottom of the movable mold 3.
[0023] In practice, as the moving mold 3 moves toward the fixed mold 2, the first locking rack 6, fixedly connected to its bottom end, gradually approaches the locking gear 5 on the fixed mold 2. As the moving mold 3 continues to move, the first locking rack 6 inserts into the rectangular groove 9 on one side of the top of the fixed mold 2. During insertion, it pushes the locking gear 5 to rotate around the shaft 4. As the locking gear 5 rotates, the second locking rack 7, originally located in the rectangular groove 9 on the other side, is gradually pushed out of the rectangular groove 9 by the meshing action of the gears and moves toward the rectangular groove 9 at the bottom of the moving mold 3 until the second locking rack 7 is fully inserted into the rectangular groove 9 at the bottom of the moving mold 3. At this point, the moving mold 3 and the fixed mold 2 achieve a tight locking connection in the horizontal direction through the mutual cooperation of the first locking rack 6, the locking gear 5, and the second locking rack 7, effectively preventing horizontal displacement of the mold during injection molding.
[0024] See Figure 1 There are four sets of locking gears 5, first locking rack 6 and second locking rack 7, and the four sets of locking gears 5, first locking rack 6 and second locking rack 7 are respectively set on the four contact surfaces at the top of the fixed mold 2 and the bottom of the moving mold 3.
[0025] In practice, during the mold closing process, the first locking racks 6 on the four contact surfaces will simultaneously move closer to the corresponding locking gears 5 and insert into the rectangular grooves 9 on one side. This method of multiple structures working simultaneously greatly enhances the stability and reliability of the locking between the moving mold 3 and the fixed mold 2. Compared with a single locking structure, it can better resist pressure from all directions during the injection molding process, further ensuring the stability of the mold during the injection molding process and effectively avoiding injection molding defects caused by mold loosening.
[0026] See Figure 1 and Figure 2 A hydraulic cylinder 10 is fixedly connected to the top plate of the base 1. The bottom drive shaft of the hydraulic cylinder 10 passes through the top plate of the base 1 and is fixedly connected to the moving mold 3. A positioning rod 11 is fixedly connected to the four corners of the top of the moving mold 3. The top of the positioning rod 11 is movably connected to the top plate of the base 1. The bottom of the positioning rod 11 passes through the moving mold 3 and extends to the bottom of the moving mold 3. A positioning hole 12 is opened at the four corners of the top of the fixed mold 2. The positioning rod 11 is adapted to the positioning hole 12.
[0027] In practice, during the process of moving mold 3 towards fixed mold 2 and closing the mold, the bottom drive shaft of hydraulic cylinder 10 extends downwards, pushing moving mold 3 closer to fixed mold 2. Simultaneously, positioning rods 11, fixedly connected to the four corners of the top of moving mold 3, also move downwards along with moving mold 3. As moving mold 3 approaches fixed mold 2, the bottom of positioning rods 11 gradually approaches the positioning holes 12 at the four corners of the top of fixed mold 2. When moving mold 3 and fixed mold 2 are about to fully fit together, the bottom of positioning rods 11 precisely inserts into the positioning holes 12. The tight fit between positioning rods 11 and positioning holes 12 provides precise positioning in the vertical direction of mold closing, further improving the accuracy of mold closing, ensuring the relative position of the mold is fixed during injection molding, and preventing product quality from being affected by vertical deviations.
[0028] See Figure 2 A positioning block 13 is fixedly connected to the top of the positioning rod 11, and the shape of the positioning block 13 is larger than that of the positioning rod 11.
[0029] In practical implementation, during the downward movement of the moving mold 3 driven by the hydraulic cylinder 10, the positioning block 13 plays a crucial role in limiting and guiding the movement. When the positioning rod 11 is inserted into the positioning hole 12, the positioning block 13 contacts the top plate of the base 1. Due to its larger area, the positioning block 13 can maintain more stable contact with the top plate, preventing the positioning rod 11 from tilting or shifting during insertion, ensuring that the positioning rod 11 is accurately inserted into the positioning hole 12. Simultaneously, the positioning block 13 can also, to a certain extent, distribute the pressure generated during the movement of the moving mold 3, protecting the connection between the positioning rod 11 and the top plate of the base 1, and extending the service life of the entire positioning structure.
[0030] Working Principle: When the moving mold 3 begins to move towards the fixed mold 2 for mold closing, the first locking rack 6, fixedly connected to the bottom of the moving mold 3, gradually approaches the locking gear 5 on the fixed mold 2 during the movement. As the moving mold 3 continues to move, the first locking rack 6 is precisely inserted into the rectangular groove 9 on one side of the top of the fixed mold 2. Due to the special fit structure between the first locking rack 6 and the rectangular groove 9, the insertion process will push the locking gear 5 to rotate around the rotating shaft 4. As the locking gear 5 rotates, the second locking rack 7, originally located in the rectangular groove 9 on the other side, is gradually pushed out of the rectangular groove 9 by the meshing action of the gears and moves towards the rectangular groove 9 pre-cut at the bottom of the moving mold 3 until the second locking rack 7 is fully inserted into the rectangular groove 9 at the bottom of the moving mold 3. At this time, the moving mold 3 and the fixed mold 2 achieve a tight locking connection in the horizontal direction through the mutual cooperation of the first locking rack 6, the locking gear 5, and the second locking rack 7, effectively preventing horizontal displacement of the mold during injection molding.
Claims
1. A positioning and locking mechanism of a two-color injection mold comprising a base (1), characterized in that, The bottom plate of the base (1) is fixedly connected with a fixed mold (2), the top end of the fixed mold (2) is movably provided with a movable mold (3), the bottom end of the movable mold (3) is fixedly connected with a first locking rack (6), the side wall of the fixed mold (2) and the movable mold (3) is provided with a semicircular groove (8), the semicircular groove (8) of the fixed mold (2) is fixedly connected with a rotating shaft (4), the rotating shaft (4) is rotatably connected with a locking gear (5), the both ends of the locking gear (5) are provided with a rectangular groove (9), the rectangular groove (9) on one side is provided with a second locking rack (7), one side of the second locking rack (7) is meshedly connected with the locking gear (5), and the other side is slidably connected in the rectangular groove (9); the first locking rack (6) is matched with the rectangular groove (9) away from the second locking rack (7).
2. The positioning and locking mechanism of a two-color injection mold according to claim 1, characterized in that: The bottom end of the movable mold (3) is provided with a rectangular groove (9), and the second locking rack (7) is matched with the rectangular groove (9) at the bottom end of the movable mold (3).
3. The positioning and locking mechanism of a two-color injection mold according to claim 2, wherein: The base (1) is in the shape of a "H" type with two upper and lower horizontal plates and a middle side plate.
4. The positioning and locking mechanism of a two-color injection mold according to claim 3, wherein: The number of the locking gear (5), the first locking rack (6) and the second locking rack (7) is four groups, and the four groups of the locking gear (5), the first locking rack (6) and the second locking rack (7) are arranged on the four contact surfaces at the top end of the fixed mold (2) and the bottom end of the movable mold (3) respectively.
5. A locating and locking mechanism for a two-color injection mold as defined in claim 4, wherein: The top plate of the base (1) is fixedly connected with a hydraulic cylinder (10), and the bottom end driving shaft of the hydraulic cylinder (10) penetrates the top plate of the base (1) and is fixedly connected with the movable mold (3).
6. A locating and locking mechanism for a two-color injection mold as defined in claim 5, wherein: The top end of the movable mold (3) is fixedly connected with a positioning rod (11), the top of the positioning rod (11) is movably connected with the top plate of the base (1), and the bottom end of the positioning rod (11) penetrates the movable mold (3) and extends to the bottom end of the movable mold (3).
7. A locating and locking mechanism for a two-color injection mold as defined in claim 6, wherein: The top end of the movable mold (3) is fixedly connected with a positioning rod (11), the top of the positioning rod (11) is movably connected with the top plate of the base (1), and the bottom end of the positioning rod (11) penetrates the movable mold (3) and extends to the bottom end of the movable mold (3).
8. The locating and locking mechanism of a two-color injection mold according to claim 7, wherein: The top end of the movable mold (3) is fixedly connected with a positioning rod (11), the top of the positioning rod (11) is movably connected with the top plate of the base (1), and the bottom end of the positioning rod (11) penetrates the movable mold (3) and extends to the bottom end of the movable mold (3). The top end of the movable mold (3) is fixedly connected with a positioning rod (11), the top of the positioning rod (11) is movably connected with the top plate of the base (1), and the bottom end of the positioning rod (11) penetrates the movable mold (3) and extends to the bottom end of the movable mold (3). The top end of the movable mold (3) is fixedly connected with a positioning rod (11), the top of the positioning rod (11) is movably connected with the top plate of the base (1), and the bottom end of the positioning rod (11) penetrates the movable mold (3) and extends to the bottom end of the movable mold (3).