Injection mold for plastic rear cover plate of mainboard

Abstract

The utility model belongs to the technical field of injection molds, and particularly relates to an injection mold for a plastic rear cover plate of a mainboard, which comprises a bottom plate, square iron is fixedly connected to the upper surface of the bottom plate, a lower mold frame is fixedly connected to the upper surface of the square iron, and a lower mold core is fixedly connected to the inner wall of the lower mold frame. An upper mold frame is attached to the upper surface of the lower mold frame, an upper mold core is fixedly connected to the inner wall of the upper mold frame, and a top plate is fixedly connected to the upper surface of the upper mold frame. According to the injection mold for the plastic rear cover plate of the main board, the top end of the spring can move upwards or downwards by rotating the adjusting bolt on the adjusting bracket, and when the ejection bracket upwards ejects the plastic rear cover plate of the main board on the lower mold core, the pulling force of the spring on the ejection bracket is changed, so that the ejection force of the injection mold can be adjusted according to the materials of raw materials; therefore, the defects of fracture, deformation or scratch and the like of the molded plastic rear cover plate of the mainboard caused by overlarge ejection force are prevented.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to an injection mold for a motherboard plastic back cover. Background Technology

[0002] Injection molds are tools used to produce plastic products; they also give plastic products their complete structure and precise dimensions. Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it refers to injecting molten plastic into a mold cavity under high pressure using an injection molding machine, and then cooling and solidifying it to obtain the molded product.

[0003] Currently, when using injection molds to manufacture motherboard plastic back covers, the raw material is usually injected into the mold cavity, which is composed of an upper mold core and a lower mold core, through the runner on the injection mold. After the raw material cools and solidifies, the motherboard plastic back cover is obtained. At the same time, after the injection mold opens, the molded motherboard plastic back cover can be separated from the lower mold core by the ejector pin on the injection mold, making it easier for workers to remove the molded motherboard plastic back cover. However, since the ejection force and ejection position of the injection mold are fixed, after changing the raw material, the molded motherboard plastic back cover often suffers from defects such as cracks, deformation, or scratches due to excessive ejection force or unsuitable ejection position. Utility Model Content

[0004] The purpose of this utility model is to provide an injection mold for a motherboard plastic back cover, which solves the problem that after changing the raw material, the molded motherboard plastic back cover often has defects such as cracks, deformation or scratches due to excessive ejection force of the injection mold or improper ejection position.

[0005] The specific technical solution adopted by this utility model is as follows:

[0006] A motherboard plastic back cover injection mold includes a base plate. A square iron is fixedly connected to the upper surface of the base plate. A lower mold frame is fixedly connected to the upper surface of the square iron. A lower mold core is fixedly connected to the inner wall of the lower mold frame. An upper mold frame is fitted to the upper surface of the lower mold frame. An upper mold core is fixedly connected to the inner wall of the upper mold frame. A top plate is fixedly connected to the upper surface of the upper mold frame. Ejection holes are provided inside the lower mold frame and the lower mold core. The upper surface of the base plate, the inner wall of the ejection holes, and the upper surface of the upper mold frame are all fitted to the lower mold frame. An ejector bracket is provided, with a spring fixedly connected to the upper surface of the ejector bracket. A cylinder is fixedly connected to the surface of the spring. A third ring is fitted onto the surface of the cylinder. A third connecting post is fixedly connected to the upper surface of the third ring and the bottom of the lower mold frame. Slotted holes are provided on both the left and right sides of the cylinder. Cylinders are fixedly connected to the front and rear sides of the inner wall of the cylinder. An adjusting bracket is fixedly connected to the bottom of the lower mold frame. The inner wall of the slotted hole and the surface of the cylinder are both fitted onto the surface of the adjusting bracket.

[0007] This utility model is further configured such that the ejector bracket includes an ejector rod, a threaded column, a first ring, a first connecting column, a second ring, a second connecting column, a horizontal plate, an adjusting nut, a circular hole, and a pressing column. The surface of the ejector rod is in contact with the inner wall of the ejector hole, the bottom end of the ejector rod is fixedly connected to the top end of the threaded column, the surface of the threaded column is in contact with the inner wall of the first ring, the upper and lower ends of the first connecting column are fixedly connected to the upper surface of the first ring and the bottom of the lower mold frame, respectively, the inner wall of the adjusting nut is threadedly connected to the surface of the threaded column, the surface of the threaded column is in contact with the inner wall of the second ring, the upper and lower ends of the second connecting column are fixedly connected to the bottom of the second ring and the upper surface of the horizontal plate, the circular hole is opened in the horizontal plate, the inner wall of the circular hole and the upper surface of the bottom plate are both in contact with the surface of the threaded column, the bottom of the spring and the bottom of the pressing column are both fixedly connected to the upper surface of the horizontal plate, and the inner wall of the lower mold frame and the upper surface of the upper mold frame are both in contact with the surface of the pressing column.

[0008] The present invention is further configured such that the axis of the threaded column and the axis of the ejector rod are on the same vertical line, and the diameter of the threaded column is equal to the diameter of the ejector rod.

[0009] The present invention is further configured such that the adjusting bracket includes a hollow square column, a threaded cylinder, an adjusting bolt, a bearing, a connecting block, and a trapezoidal block. The front and rear sides of the hollow square column are both in contact with the inner wall of the strip hole. The inner wall of the hollow square column is fixedly connected to the surface of the threaded cylinder. The inner wall of the threaded cylinder is threadedly connected to the surface of the adjusting bolt. The surface of the adjusting bolt is fixedly connected to the inner ring of the bearing. The outer ring of the bearing is fixedly connected to the inner wall of the connecting block. The upper surface of the connecting block is fixedly connected to the bottom of the lower mold frame. The upper surface of the hollow square column is fixedly connected to the bottom of the trapezoidal block. The inclined surface of the trapezoidal block is in contact with the surface of the cylinder.

[0010] The present invention is further configured such that the height of the strip hole is greater than the height of the hollow square column, and the width of the strip hole is equal to the width of the hollow square column.

[0011] The present invention is further configured such that a guide cylinder is fixedly connected to the inner wall of the lower mold frame, a guide post is fitted to the inner wall of the guide cylinder, and the surface of the guide post is fixedly connected to the inner wall of the upper mold frame.

[0012] The technical effects achieved by this utility model are as follows:

[0013] This utility model discloses a motherboard plastic back cover injection mold. By rotating the adjusting bolt on the adjusting bracket, the trapezoidal block can be moved to the left or right. At the same time, when the trapezoidal block moves, the top of the spring can be moved up or down through the cooperation of the trapezoidal block and the cylinder. When the ejector bracket pushes the motherboard plastic back cover on the upper mold core, the tension of the spring on the ejector bracket changes. Thus, the ejection force of the injection mold can be adjusted according to the material of the raw material, thereby preventing defects such as cracking, deformation or scratches on the molded motherboard plastic back cover due to excessive ejection force.

[0014] This utility model discloses a motherboard plastic back cover injection mold, which includes an ejector rod, a threaded post, a first ring, a first connecting post, a second ring, a second connecting post, a horizontal plate, an adjusting nut, and a circular hole. When the user rotates the adjusting nut, the position of the adjusting nut on the threaded post changes through the thread. At the same time, when the adjusting bolt contacts the second ring, the upward-moving horizontal plate causes the ejector rod to move upward. When the adjusting bolt contacts the first ring, the upward-moving horizontal plate no longer causes the ejector rod to move upward. Thus, the injection mold can adjust the ejection position according to the material of the raw material. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 This is a side view of the structure of this utility model;

[0018] Figure 4 This is a top view of the lower mold frame in this utility model;

[0019] Figure 5 This is a front view of the ejector bracket in this utility model;

[0020] Figure 6 yes Figure 5 Sectional view at point BB;

[0021] Figure 7 This is a top view of the horizontal plate in this utility model;

[0022] Figure 8 This is a side view of the cylinder in this utility model;

[0023] Figure 9 This is a top view of the cylinder in this utility model;

[0024] Figure 10 This is a top view of the adjusting bracket in this utility model;

[0025] Figure 11 yes Figure 10 Sectional view at CC;

[0026] Figure 12 This is a side view of the hollow square column in this utility model.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Base plate; 2. Square iron; 3. Lower mold frame; 4. Lower mold core; 5. Upper mold frame; 6. Upper mold core; 7. Top plate; 8. Ejection hole; 9. Ejection bracket; 901. Ejection rod; 902. Threaded column; 903. First ring; 904. First connecting column; 905. Second ring; 906. Second connecting column; 907. Horizontal plate; 908. Adjusting nut; 909. Round hole; 910. Pressing column; 10. Spring; 11. Cylinder; 12. Third ring; 13. Third connecting column; 14. Strip hole; 15. Cylinder; 16. Adjusting bracket; 1601. Hollow square column; 1602. Threaded cylinder; 1603. Adjusting bolt; 1604. Bearing; 1605. Connecting block; 1606. Trapezoidal block; 17. Guide cylinder; 18. Guide column. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] like Figures 1 to 12As shown, the injection mold for the motherboard plastic back cover includes a base plate 1. A square iron 2 is fixedly connected to the upper surface of the base plate 1. A lower mold base 3 is fixedly connected to the upper surface of the square iron 2. A lower mold core 4 is fixedly connected to the inner wall of the lower mold base 3. An upper mold base 5 is fitted onto the upper surface of the lower mold base 3. An upper mold core 6 is fixedly connected to the inner wall of the upper mold base 5. A top plate 7 is fixedly connected to the upper surface of the upper mold base 5. Ejection holes 8 are provided inside the lower mold base 3 and the lower mold core 4. Ejection supports are fitted onto the upper surface of the base plate 1, the inner wall of the ejection holes 8, and the upper surface of the upper mold base 5. A spring 10 is fixedly connected to the upper surface of the ejector bracket 9. A cylinder 11 is fixedly connected to the surface of the spring 10. A third ring 12 is attached to the surface of the cylinder 11. A third connecting post 13 is fixedly connected to the upper surface of the third ring 12 and the bottom of the lower mold frame 3. A strip hole 14 is opened on both the left and right sides of the cylinder 11. A cylinder 15 is fixedly connected to the front and rear sides of the inner wall of the cylinder 11. An adjusting bracket 16 is fixedly connected to the bottom of the lower mold frame 3. The inner wall of the strip hole 14 and the surface of the cylinder 15 are attached to the surface of the adjusting bracket 16.

[0032] The ejector bracket 9 includes an ejector rod 901, a threaded post 902, a first ring 903, a first connecting post 904, a second ring 905, a second connecting post 906, a horizontal plate 907, an adjusting nut 908, a circular hole 909, and a pressing post 910. The surface of the ejector rod 901 is in contact with the inner wall of the ejector hole 8. The bottom end of the ejector rod 901 is fixedly connected to the top end of the threaded post 902. The axis of the threaded post 902 is on the same vertical line as the axis of the ejector rod 901. The diameter of the threaded post 902 is equal to the diameter of the ejector rod 901. The surface of the threaded post 902 is in contact with the inner wall of the first ring 903. The upper and lower ends of the first connecting post 904 are respectively connected to the first ring 905, the second connecting post 906, the first ring 907, the second connecting post 908, the second connecting post 909, and the first connecting post 900. The upper surface of the ring 903 is fixedly connected to the bottom of the lower mold frame 3. The inner wall of the adjusting nut 908 is threadedly connected to the surface of the threaded column 902. The surface of the threaded column 902 is in contact with the inner wall of the second ring 905. The upper and lower ends of the second connecting column 906 are fixedly connected to the bottom of the second ring 905 and the upper surface of the horizontal plate 907, respectively. The round hole 909 is opened in the horizontal plate 907. The inner wall of the round hole 909 and the upper surface of the base plate 1 are both in contact with the surface of the threaded column 902. The bottom of the spring 10 and the bottom of the pressing column 910 are both fixedly connected to the upper surface of the horizontal plate 907. The inner wall of the lower mold frame 3 and the upper surface of the upper mold frame 5 are both in contact with the surface of the pressing column 910.

[0033] The adjusting bracket 16 includes a hollow square column 1601, a threaded cylinder 1602, an adjusting bolt 1603, a bearing 1604, a connecting block 1605, and a trapezoidal block 1606. The front and rear sides of the hollow square column 1601 are fitted against the inner wall of the slotted hole 14. The height of the slotted hole 14 is greater than the height of the hollow square column 1601, and the width of the slotted hole 14 is equal to the width of the hollow square column 1601. The inner wall of the hollow square column 1601 is fixedly connected to the surface of the threaded cylinder 1602. Then, the inner wall of the threaded cylinder 1602 is threadedly connected to the surface of the adjusting bolt 1603, the surface of the adjusting bolt 1603 is fixedly connected to the inner ring of the bearing 1604, the outer ring of the bearing 1604 is fixedly connected to the inner wall of the connecting block 1605, the upper surface of the connecting block 1605 is fixedly connected to the bottom of the lower mold frame 3, the upper surface of the hollow square column 1601 is fixedly connected to the bottom of the trapezoidal block 1606, and the inclined surface of the trapezoidal block 1606 is in contact with the surface of the cylinder 15.

[0034] It should be noted that when the upper mold frame 5 and the lower mold frame 3 are joined together, the upper mold frame 5 can press the pressing column 910 and stretch the spring 10. When the upper mold frame 5 and the lower mold frame 3 are separated, the tension of the spring 10 on the horizontal plate 907 can cause the ejector rod 901 to move upward. The upward-moving ejector rod 901 separates the molded main plastic back cover from the lower mold core 4. Through the cooperation of the third ring 12 and the third connecting column 13, the cylinder 11 can only move upward. When the user rotates the adjusting bolt 1603, the hollow square column 1601 can move to the left or right through the cooperation of the adjusting bolt 1603 and the threaded cylinder 1602. At the same time, when the hollow square column 1601 moves horizontally, the top of the spring 10 can move up or down through the cooperation of the inclined surface of the trapezoidal block 1606 and the cylinder 15. When the ejector bracket 9 is on the main plastic back cover plate of the upper and lower mold core 4, the tension of the spring 10 on the ejector bracket 9 changes.

[0035] like Figure 4 As shown, a guide cylinder 17 is fixedly connected to the inner wall of the lower mold frame 3, and a guide post 18 is fitted to the inner wall of the guide cylinder 17. The surface of the guide post 18 is fixedly connected to the inner wall of the upper mold frame 5.

[0036] It should be noted that the movement trajectory of the upper mold frame 5 can be positioned by the cooperation of the guide cylinder 17 and the guide column 18.

[0037] The working principle of this utility model is as follows: First, the injection mold is installed on the injection molding machine. Then, the upper mold frame 5 and the lower mold frame 3 are combined together. The upper mold frame 5 presses the pressing column 910 so that the top of the ejector rod 901 is at the lowest point. Then, the raw material is injected into the space between the upper mold core 6 and the lower mold core 4 through the flow channel on the top plate 7 and the upper mold frame 5.

[0038] After the raw material is formed, the upper mold frame 5 is separated from the lower mold frame 3, and the ejector rod 901 is moved upward by the pulling force of the spring 10 on the horizontal plate 907. At this time, the molded main plastic back cover plate is separated from the lower mold core 4 by the upward ejector rod 901.

[0039] When the ejection position needs to be adjusted, first rotate the adjusting nut 908 on the designated threaded post 902 to make the adjusting nut 908 contact the first ring 903. At this time, the horizontal plate 907 will not drive the ejection rod 901 to move upward when it moves upward. Then, rotate the adjusting nut 908 on the designated threaded post 902 to make the adjusting nut 908 contact the second ring 905. At this time, the adjusting nut 908 will enable the horizontal plate 907 to drive the ejection rod 901 to move upward when it moves upward.

[0040] When it is necessary to adjust the pushing force of the ejector rod 901 on the plastic back cover of the main board, first rotate the adjusting bolt 1603 to make the hollow square column 1601 move to the left or right under the action of the threaded cylinder 1602 and the adjusting bolt 1603. At the same time, when the hollow square column 1601 moves horizontally, the top of the spring 10 can be moved up or down through the cooperation of the inclined surface of the trapezoidal block 1606 and the cylinder 15. When the top of the spring 10 moves up, the pushing force of the ejector rod 901 on the plastic back cover of the main board will increase, and when the top of the spring 10 moves down, the pushing force of the ejector rod 901 on the plastic back cover of the main board will decrease.

[0041] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A motherboard plastic back cover injection mold, characterized in that: The system includes a base plate (1), a square iron (2) fixedly connected to the upper surface of the base plate (1), a lower mold frame (3) fixedly connected to the upper surface of the square iron (2), a lower mold core (4) fixedly connected to the inner wall of the lower mold frame (3), an upper mold frame (5) fitted to the upper surface of the lower mold frame (3), an upper mold core (6) fixedly connected to the inner wall of the upper mold frame (5), a top plate (7) fixedly connected to the upper surface of the upper mold frame (5), ejection holes (8) are provided inside the lower mold frame (3) and the lower mold core (4), and ejection brackets (9) are fitted to the upper surface of the base plate (1), the inner wall of the ejection holes (8), and the upper surface of the upper mold frame (5). A spring (10) is fixedly connected to the upper surface of the ejector bracket (9). A cylinder (11) is fixedly connected to the surface of the spring (10). A third ring (12) is attached to the surface of the cylinder (11). A third connecting column (13) is fixedly connected to the upper surface of the third ring (12) and the bottom of the lower mold frame (3). A strip hole (14) is opened on both the left and right sides of the cylinder (11). A cylinder (15) is fixedly connected to the front and rear sides of the inner wall of the cylinder (11). An adjusting bracket (16) is fixedly connected to the bottom of the lower mold frame (3). The inner wall of the strip hole (14) and the surface of the cylinder (15) are attached to the surface of the adjusting bracket (16).

2. The injection mold for the motherboard plastic back cover plate according to claim 1, characterized in that: The ejector bracket (9) includes an ejector rod (901), a threaded post (902), a first ring (903), a first connecting post (904), a second ring (905), a second connecting post (906), a horizontal plate (907), an adjusting nut (908), a circular hole (909), and a pressing post (910). The surface of the ejector rod (901) is in contact with the inner wall of the ejector hole (8). The bottom end of the ejector rod (901) is fixedly connected to the top end of the threaded post (902). The surface of the threaded post (902) is in contact with the inner wall of the first ring (903). The upper and lower ends of the first connecting post (904) are fixedly connected to the upper surface of the first ring (903) and the bottom of the lower mold frame (3), respectively. The adjusting nut (908) is a horizontal plate (907), an adjusting nut (908), a circular hole (909), and a pressing post (910). The inner wall of the nut (908) is threadedly connected to the surface of the threaded post (902). The surface of the threaded post (902) is in contact with the inner wall of the second ring (905). The upper and lower ends of the second connecting post (906) are fixedly connected to the bottom of the second ring (905) and the upper surface of the horizontal plate (907), respectively. The circular hole (909) is opened in the horizontal plate (907). The inner wall of the circular hole (909) and the upper surface of the bottom plate (1) are in contact with the surface of the threaded post (902). The bottom of the spring (10) and the bottom of the pressing post (910) are fixedly connected to the upper surface of the horizontal plate (907). The inner wall of the lower mold frame (3) and the upper surface of the upper mold frame (5) are in contact with the surface of the pressing post (910).

3. The injection mold for the motherboard plastic back cover plate according to claim 2, characterized in that: The axis of the threaded rod (902) is on the same vertical line as the axis of the ejector rod (901), and the diameter of the threaded rod (902) is equal to the diameter of the ejector rod (901).

4. The injection mold for the motherboard plastic back cover plate according to claim 1, characterized in that: The adjusting bracket (16) includes a hollow square column (1601), a threaded cylinder (1602), an adjusting bolt (1603), a bearing (1604), a connecting block (1605), and a trapezoidal block (1606). The front and rear sides of the hollow square column (1601) are in contact with the inner wall of the strip hole (14). The inner wall of the hollow square column (1601) is fixedly connected to the surface of the threaded cylinder (1602). The inner wall of the threaded cylinder (1602) is connected to the adjusting bolt (1603). The surface of the adjusting bolt (1603) is fixedly connected to the inner ring of the bearing (1604), the outer ring of the bearing (1604) is fixedly connected to the inner wall of the connecting block (1605), the upper surface of the connecting block (1605) is fixedly connected to the bottom of the lower mold frame (3), the upper surface of the hollow square column (1601) is fixedly connected to the bottom of the trapezoidal block (1606), and the inclined surface of the trapezoidal block (1606) is in contact with the surface of the cylinder (15).

5. The injection mold for the motherboard plastic back cover plate according to claim 4, characterized in that: The height of the strip hole (14) is greater than the height of the hollow square column (1601), and the width of the strip hole (14) is equal to the width of the hollow square column (1601).

6. The injection mold for the motherboard plastic back cover plate according to claim 1, characterized in that: The inner wall of the lower mold frame (3) is fixedly connected to a guide cylinder (17), and a guide post (18) is attached to the inner wall of the guide cylinder (17). The surface of the guide post (18) is fixedly connected to the inner wall of the upper mold frame (5).

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