Injection mold

Abstract

The injection mold comprises a fixed mold plate and a movable mold plate, through holes are formed in the fixed mold plate and close to four corners, guide columns corresponding to the through holes are arranged on one side, facing the fixed mold plate, of the movable mold plate, the movable mold plate can abut against the fixed mold plate so that the guide columns can be inserted into the through holes, and protruding blocks are fixed to the ends, facing the fixed mold plate, of the guide columns. The protruding block is connected with the guide column through a bolt, and the guide column is connected with the movable mold plate through a bolt. According to the utility model, the replaceable convex block is arranged at the end part of the guide pillar, so that after the die is used for many times, only the worn convex block needs to be replaced, the whole guide pillar does not need to be replaced, and the service life of the guide pillar can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of mold manufacturing, and more specifically, to an injection mold. Background Art

[0002] The manufacture of plastic products requires injection molding. For example, the plastic parts of baby carriages are made of a fixed mold and a movable mold. The fixed mold is fixed on the injection molding machine. A gate is set in the fixed mold. When injection molding is performed, the injection molding machine pushes the movable mold toward the fixed mold and abuts against the fixed mold. Then, the glue is injected through the injection molding machine. After the plastic in the mold is cooled and formed, the movable mold is moved and separated from the fixed mold to complete the injection molding of the plastic parts.

[0003] The quality of injection molds will directly affect the quality of plastic parts. During the multiple mold closing and opening processes, the current molds are prone to mold surface wear due to repeated collisions between the movable mold and the fixed mold, which reduces the mold closing effect and causes flash and burrs on the edges of plastic parts, greatly affecting the quality of plastic parts. In addition, the guide pins of the movable mold will also wear, and the wear of the guide pins starts from the ends of the guide pins, thereby reducing the positioning accuracy and requiring frequent replacement of the guide pins. However, the existing guide pins are inconvenient to replace, which is not conducive to mold maintenance, so there is an urgent need for improvement. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the above-mentioned prior art and to provide an injection mold. By installing a replaceable protrusion at the end of a guide column, after the mold has been used many times, only the worn protrusion needs to be replaced without replacing the entire guide column, thereby increasing the service life of the guide column.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses an injection mold, comprising a fixed mold plate and a movable mold plate, wherein through holes are arranged near four corners inside the fixed mold plate, a guide column corresponding to the through holes is arranged on a side of the movable mold plate facing the fixed mold plate, the movable mold plate can abut against the fixed mold plate so that the guide column is inserted into the through hole, a convex block is fixed on one end of the guide column facing the fixed mold plate, the convex block is connected to the guide column by bolts, and the guide column is connected to the movable mold plate by bolts.

[0007] Furthermore, the through hole includes a coaxially arranged positioning groove, a positioning hole and a guide hole, the diameter of the positioning groove is larger than the diameter of the positioning hole, the diameter of the positioning hole is larger than the diameter of the guide hole, the guide column includes a first positioning platform, a second positioning platform is provided on the side of the first positioning platform, a guide platform is provided on the side of the second positioning platform, the end of the guide platform is connected to the protrusion, the first positioning platform can be inserted into the positioning groove, the second positioning platform can be inserted into the positioning hole, and the guide platform and the protrusion can be inserted into the guide hole.

[0008] Furthermore, the first positioning platform abuts against the side of the movable template, and a connecting platform is provided on the side of the first positioning platform away from the second positioning platform. The connecting platform is inserted into the movable template and fixed to the movable template by bolts.

[0009] Furthermore, the hardness of the protrusion is smaller than the hardness of the guide post, and the hardness of the guide post is smaller than the hardness of the fixed template.

[0010] Furthermore, it also includes a buffer mechanism, the fixed template is provided with a first notch on the circumferential side, the movable template is provided with a second notch corresponding to the first notch on the circumferential side, the buffer mechanism includes a first buffer block and a second buffer block, the first buffer block is inserted into the first notch and fixed, the second buffer block is inserted into the second notch and fixed, and the second buffer block can abut against the first buffer block.

[0011] Furthermore, a guide groove connected to the first notch is provided in the fixed template, and a spring and a striker capable of moving along the guide groove are provided in the guide groove, one end of the spring abuts against the striker and the other end abuts against the end face of the guide groove, one end of the striker passes through a first buffer block, and the second buffer block can abut against the striker and push the striker to move to compress the spring.

[0012] Furthermore, the striker includes a limiting section and a collision section, the first buffer block includes a limiting hole, the limiting section is located in the guide groove, the end of the limiting section can abut against the side of the first buffer block, and the collision section passes through the limiting hole.

[0013] Furthermore, a base plate is provided on the side of the movable template away from the fixed template, and two connecting plates are fixed on the side of the base plate facing the movable template. The connecting plates abut against the side surfaces of the movable template, and the movable template, base plate and connecting plates are fixed by bolts.

[0014] Furthermore, a plurality of guide shafts are fixed to the side of the base plate, an end of the guide shaft away from the base plate is fixed to the movable template, a top plate is provided between the movable template and the base plate, the guide shaft passes through the top plate, a plurality of ejector rods are provided on the side of the top plate facing the movable template, the ejector rods are inserted into the movable template, a driver is connected to the side of the base plate away from the movable template, and the driver can drive the top plate to move along the guide shaft so that the ejector rods pass through the movable template.

[0015] Furthermore, a fixing plate is provided on a side of the fixed template away from the movable template, and the fixing plate and the fixed template are fixed by a connecting block.

[0016] The beneficial effects of the utility model are:

[0017] 1. When the movable platen moves toward the fixed platen, the convex block first penetrates into the through hole, and then the guide post penetrates into the through hole. Therefore, the convex block will be worn first. When the convex block is excessively worn, the convex block can be directly replaced, which can not only effectively reduce the replacement frequency of the guide post and increase the service life of the guide post, but also effectively ensure the mold closing accuracy of the movable platen and the fixed platen, and improve the injection molding quality of plastic parts. The guide post and the movable platen are connected by bolts, which is convenient for the disassembly and assembly of the guide post;

[0018] 2. By setting positioning grooves, positioning holes and guide holes to form holes of different steps, it can not only effectively reduce the convex device fixed platen when the fixed platen and the movable platen are slightly offset, thus improving the reliability of the structure, but also greatly improve the positioning accuracy during mold closing, thus realizing the design of high-precision molds;

[0019] 3. The hardness of the first buffer block and the second buffer block is greater than that of the fixed mold plate and the movable mold plate. When the fixed mold plate abuts against the movable mold plate, the first buffer block also abuts against the second buffer block. By setting the first buffer block and the second buffer block, the wear of the fixed mold plate and the movable mold plate during mold closing collision can be reduced, thereby increasing the service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A structural diagram of this embodiment;

[0021] Figure 2 is an exploded view of this embodiment;

[0022] Figure 3 is a plan view of this embodiment;

[0023] Figure 4 It is a partial cross-sectional view of the matching part between the guide column and the fixed template;

[0024] Figure 5 A partial cross-sectional view of the buffer mechanism.

[0025] 1. Fixed template; 11. Connecting block; 12. Fixed plate; 13. Through hole; 131. Positioning groove; 132. Positioning hole; 133. Guide hole; 14. First notch; 15. Guide groove; 2. Moving template; 21. Guide column; 211. Connecting platform; 212. First positioning platform; 213. Second positioning platform; 214. Guide platform; 22. Second notch; 3. Base plate; 31. Connecting plate; 32. Guide shaft; 4. Ejector plate; 41. Ejector rod; 5. Driver; 6. Bump; 7. Buffer mechanism; 71. First buffer block; 711. Limiting hole; 72. Second buffer block; 8. Strike pin; 81. Limiting section; 82. Collision section; 9. Spring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] like Figures 1 to 5 As shown, an injection mold includes a fixed mold plate 1 and a movable mold plate 2, a fixed plate 12 is provided on the side of the fixed mold plate 1 away from the movable mold plate 2, the fixed plate 12 and the fixed mold plate 1 are fixed by a connecting block 11, the fixed plate 12 is fixed on the injection molding machine, and a gate is provided in the middle of the fixed plate 12. During injection molding, the movable mold plate 2 abuts against the fixed mold plate 1, and a cavity of a plastic part is formed between the fixed mold plate 1 and the movable mold plate 2. The colloid enters the cavity through the gate to realize the injection molding operation of the plastic part.

[0028] The fixed template 1 is provided with through holes 13 near the four corners, and the movable template 2 is provided with guide columns 21 corresponding to the through holes 13 on the side facing the fixed template. The guide columns 21 are connected to the movable template 2 by bolts. Specifically, the first positioning platform 212 abuts against the side of the movable template 2, and the first positioning platform 212 is provided with a connecting platform 211 on the side away from the second positioning platform 213. The connecting platform 211 is inserted into the movable template 2 and fixed to the movable template 2 by bolts. The guide columns 21 and the movable template 2 are connected by bolts, which facilitates the disassembly and assembly of the guide columns 21.

[0029] The guide post 21 can be inserted into the through hole 13, and a protrusion 6 is fixed to one end of the guide post 21 facing the fixed template 1. The protrusion 6 is connected to the guide post 21 by bolts. The hardness of the protrusion 6 is less than that of the guide post 21. The protrusion 6 is a copper part. The hardness of the guide post 21 is less than that of the fixed template 1. When the movable template 2 moves toward the fixed template 1, the protrusion 6 first penetrates into the through hole 13, and then the guide post 21 penetrates into the through hole 13. Therefore, the protrusion 6 will be worn first. When the protrusion 6 is excessively worn, the protrusion 6 can be directly replaced, which can not only effectively reduce the replacement frequency of the guide post 21 and increase the service life of the guide post 21, but also effectively ensure the mold closing accuracy of the movable template 2 and the fixed template 1, and improve the injection molding quality of plastic parts.

[0030] The through hole 13 includes a coaxially arranged positioning groove 131, a positioning hole 132 and a guide hole 133, the diameter of the positioning groove 131 is larger than the diameter of the positioning hole 132, the diameter of the positioning hole 132 is larger than the diameter of the guide hole 133, the guide column 21 includes a first positioning platform 212, a second positioning platform 213 is provided on the side of the first positioning platform 212, a guide platform 214 is provided on the side of the second positioning platform 213, the end of the guide platform 214 is connected to the protrusion 6, the side wall of the guide platform 214 is flush with the side wall of the protrusion 6, the first positioning platform 212 can be inserted into the positioning groove 131, and the second positioning platform 213 can be inserted into the positioning hole 132, the guide platform 214 and the protrusion 6 can be inserted into the guide hole 133, wherein the gap size between the inner wall of the guide hole 133 and the side wall of the guide platform 214 is larger than the gap size between the positioning hole 132 and the second positioning platform 213, and also larger than the gap size between the positioning groove 131 and the first positioning platform. In this embodiment, by setting the positioning groove 131, the positioning hole 132 and the guide hole 133, holes of different steps are formed, which can not only effectively reduce the protrusion 6 device of the fixed template 1 when the fixed template 1 and the movable template 2 are slightly offset, thereby improving the reliability of the structure, but also can greatly improve the positioning accuracy during mold closing, thereby realizing the design of high-precision molds.

[0031] It also includes a buffer mechanism 7, wherein the fixed template 1 is provided with a first notch 14 on its circumferential side, and the movable template 2 is provided with a second notch 22 corresponding to the first notch 14 on its circumferential side, and the buffer mechanism 7 includes a first buffer block 71 and a second buffer block 72, wherein the first buffer block 71 is inserted into the first notch 14 and fixed, and the second buffer block 72 is inserted into the second notch 22 and fixed, and the second buffer block 72 can abut against the first buffer block 71, and the hardness of the first buffer block 71 and the second buffer block 72 is greater than that of the fixed template 1 and the movable template 2, and when the fixed template 1 abuts against the movable template 2, the first buffer block 71 also abuts against the second buffer block 72, and by providing the first buffer block 71 and the second buffer block 72, the wear of the fixed template 1 and the movable template 2 during mold closing collision can be reduced, thereby improving the service life of the mold.

[0032] The fixed template 1 is provided with a guide groove 15 connected with the first notch 14, and the guide groove 15 is provided with a spring 9 and a striker 8 that can move along the guide groove 15, one end of the spring 9 abuts the striker 8 and the other end abuts the end face of the guide groove 15, one end of the striker 8 passes through the first buffer block 71, and the second buffer block 72 can abut the striker 8 and push the striker 8 to move so that the spring 9 is compressed. Specifically, the striker 8 includes a limiting section 81 and a collision section 82, and the first buffer block 71 includes a limiting hole 711, and the limiting section 81 is located in the guide groove 15. The end of the limiting section 81 can abut the side of the first buffer block 71, and the collision section 82 passes through the limiting hole 711. By arranging the striker 8 and the spring 9, the fixed template 1 and the movable template 2 play a buffering role when they are about to be molded, and effectively prevent the movable template 2 from quickly colliding with the fixed template 1, which can not only improve the reliability during mold closing, but also effectively reduce the wear of the end faces of the fixed template 1 and the movable template 2.

[0033] A base plate 3 is provided on the side of the movable plate 2 away from the fixed plate 1, two connecting plates 31 are fixed on the side of the base plate 3 facing the movable plate 2, the connecting plates 31 abut against the side of the movable plate 2, the movable plate 2, the base plate 3 and the connecting plates 31 are fixed by bolts, a plurality of guide shafts 32 are fixed on the side of the base plate 3, one end of the guide shaft 32 away from the base plate 3 is fixed to the movable plate 2, a top plate 4 is provided between the movable plate 2 and the base plate 3, the guide shaft 32 penetrates the top plate 4, and a plurality of ejector rods 41 are provided on the side of the top plate 4 facing the movable plate 2 The ejector rod 41 is inserted into the movable template 2, and a driver 5 is connected to the side of the base plate 3 away from the movable template 2. The driver 5 can drive the ejector plate 4 to move along the guide shaft 32 so that the ejector rod 41 passes through the movable template 2. The driver 5 is a cylinder. After the injection molding of the plastic part is completed, the plastic part will be moved out of the fixed template 1 along with the movable template 2 and attached to the surface of the movable template 2. At this time, the ejector plate 4 is driven to move by the driver 5, and the plastic part can be pushed by multiple ejector rods 41, so that the plastic part can be separated from the movable template 2, which is convenient for unloading of the plastic part.

[0034] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An injection mold, characterized in that: The invention comprises a fixed die plate (1) and a movable die plate (2), wherein the fixed die plate (1) is provided with through holes (13) near four corners, and the movable die plate (2) is provided with guide posts (21) corresponding to the through holes (13) on the side facing the fixed die plate, and the movable die plate (2) can abut against the fixed die plate (1) so that the guide posts (21) are inserted into the through holes (13), and a convex block (6) is fixed to one end of the guide post (21) facing the fixed die plate (1), and the convex block (6) is connected to the guide post (21) by bolts, and the guide post (21) is connected to the movable die plate (2) by bolts.

2. An injection mold according to claim 1, characterized in that: The through hole (13) comprises a coaxially arranged positioning groove (131), a positioning hole (132) and a guide hole (133); the diameter of the positioning groove (131) is larger than the diameter of the positioning hole (132); the diameter of the positioning hole (132) is larger than the diameter of the guide hole (133); the guide column (21) comprises a first positioning platform (212); a second positioning platform (213) is provided on the side of the first positioning platform (212); a guide platform (214) is provided on the side of the second positioning platform (213); an end of the guide platform (214) is connected to a protrusion (6); the first positioning platform (212) can be inserted into the positioning groove (131); the second positioning platform (213) can be inserted into the positioning hole (132); the guide platform (214) and the protrusion (6) can be inserted into the guide hole (133).

3. An injection mold according to claim 2, characterized in that: The first positioning platform (212) abuts against the side of the movable platen (2); a connecting platform (211) is provided on the side of the first positioning platform (212) away from the second positioning platform (213); the connecting platform (211) is inserted into the movable platen (2) and fixed to the movable platen (2) by bolts.

4. The injection mold according to claim 1, characterized in that: The hardness of the protrusion (6) is smaller than the hardness of the guide column (21), and the hardness of the guide column (21) is smaller than the hardness of the fixed template (1).

5. The injection mold according to claim 1, characterized in that: The invention also comprises a buffer mechanism (7), wherein a first notch (14) is provided on the circumferential side of the fixed template (1), and a second notch (22) corresponding to the first notch (14) is provided on the circumferential side of the movable template (2), and the buffer mechanism (7) comprises a first buffer block (71) and a second buffer block (72), wherein the first buffer block (71) is inserted into the first notch (14) and fixed, and the second buffer block (72) is inserted into the second notch (22) and fixed, and the second buffer block (72) can abut against the first buffer block (71).

6. An injection mold according to claim 5, characterized in that: The fixed template (1) is provided with a guide groove (15) connected to the first notch (14), the guide groove (15) is provided with a spring (9) and a striker (8) capable of moving along the guide groove (15), one end of the spring (9) abuts against the striker (8) and the other end abuts against the end surface of the guide groove (15), one end of the striker (8) passes through a first buffer block (71), and the second buffer block (72) can abut against the striker (8) and push the striker (8) to move, so as to compress the spring (9).

7. An injection mold according to claim 6, characterized in that: The striker (8) comprises a limiting section (81) and a collision section (82); the first buffer block (71) comprises a limiting hole (711); the limiting section (81) is located in the guide groove (15); the end of the limiting section (81) can abut against the side of the first buffer block (71); and the collision section (82) passes through the limiting hole (711).

8. The injection mold according to claim 1, characterized in that: A base plate (3) is provided on the side of the movable plate (2) away from the fixed plate (1); two connecting plates (31) are fixed on the side of the base plate (3) facing the movable plate (2); the connecting plates (31) abut against the side of the movable plate (2); and the movable plate (2), the base plate (3) and the connecting plates (31) are fixed by bolts.

9. An injection mold according to claim 8, characterized in that: A plurality of guide shafts (32) are fixed to the side of the base plate (3); one end of the guide shaft (32) away from the base plate (3) is fixed to the movable plate (2); a top plate (4) is provided between the movable plate (2) and the base plate (3); the guide shaft (32) passes through the top plate (4); a plurality of ejector rods (41) are provided on the side of the top plate (4) facing the movable plate (2); the ejector rods (41) are inserted into the movable plate (2); a driver (5) is connected to the side of the base plate (3) away from the movable plate (2); the driver (5) can drive the top plate (4) to move along the guide shaft (32) so that the ejector rods (41) pass through the movable plate (2).

10. The injection mold according to claim 1, characterized in that: A fixing plate (12) is provided on the side of the fixed mold plate (1) away from the movable mold plate (2), and the fixing plate (12) and the fixed mold plate (1) are fixed via a connecting block (11).

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