Injection mold

Abstract

The utility model discloses an injection mold. The injection mold comprises a main mold plate, a push plate, a bottom plate, an inclined guide column, a sliding block and a first ejector rod. After the main mold plate is opened, the push plate is pushed towards the main mold plate, so that the sliding block pushes the first ejector rod, the top end of the first ejector rod pushes a workpiece, the sliding block slides towards the top end of the inclined guide column to be away from the first ejector rod, and when the sliding block is separated from the first ejector rod, the first ejector rod stops moving. After the push plate is pushed by a certain distance, the sliding block can be separated from the first ejector rod, the push plate continues to push forwards and cannot drive the first ejector rod to move forwards, the push plate can drive other ejector rods in the injection mold to continue to eject a workpiece out to demold the workpiece, and therefore the workpiece and the first ejector rod can also be away from each other to demold the workpiece. The injection mold solves the problem that complex parts of workpieces are difficult to demold, and is simple in structure and easy to improve on the basis of an existing injection mold.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to an injection mold. Background Technology

[0002] In the field of mold forming technology, the process involves injecting raw materials into the mold, holding pressure, cooling, opening the mold to remove the part, and polishing the finished product. During the mold opening and part removal process, a lifting mechanism is often designed within the mold to eject the molded workpiece. This lifting mechanism then retracts to await the next demolding attempt. For workpieces with complex shapes and large contact areas with the ejector elements, there are technical problems such as long ejection time and distance for the ejector elements during demolding, and tight connections between the ejector elements and the workpiece, making it difficult for the workpiece to separate from the ejector elements during demolding. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an injection mold that makes it easier to demold the workpiece.

[0004] An injection mold according to an embodiment of the present invention includes a main mold plate, a push plate, a base plate, an inclined guide post, a slider, and a first ejector rod. The main mold plate has a cavity for molding a workpiece. The push plate is spaced apart from the main mold plate. The base plate is disposed on the side of the push plate away from the main mold plate. The bottom end of the inclined guide post is fixedly installed on the base plate, and the top end of the inclined guide post extends relative to the end face of the base plate facing the push plate. The slider is sleeved on the inclined guide post and slidably installed on the side of the push plate facing the base plate. The bottom end of the first ejector rod abuts against the slider, and the top end of the first ejector rod abuts against the workpiece. From bottom to top, the inclined guide post moves away from the first ejector rod along a horizontal plane. When the main mold plate is opened, the push plate pushes towards the main mold plate, thereby causing the slider to push the first ejector rod, so that the top end of the first ejector rod pushes the workpiece. The slider slides towards the top end of the inclined guide post, thereby moving away from the first ejector rod. When the slider disengages from the first ejector rod, the first ejector rod stops moving.

[0005] The injection mold according to the embodiment of this utility model has at least the following beneficial effects: The first ejector pin of this utility model is used to eject complex parts of the workpiece. By adding a set of sliders and inclined guide pins to the bottom end of the first ejector pin, the inclined guide pins are installed on a fixed base plate, and the sliders are sleeved on the inclined guide pins and abut against the first ejector pin. When the main mold plate opens, the push plate pushes forward, causing the sliders to slide relative to the inclined guide pins. Since the inclined guide pins gradually move away from the first ejector pin from bottom to top, the sliders will also gradually move away from the first ejector pins while sliding forward. When the push plate pushes a certain distance, the sliders will disengage from the first ejector pins. At this time, the push plate will not drive the first ejector pins to move forward when it continues to push forward. Instead, the push plate will drive other ejector pins in the injection mold to continue ejecting the workpiece and demolding it. Therefore, the workpiece and the first ejector pins will also move away from each other and demold, solving the problem of difficult demolding of complex parts of the workpiece. Moreover, there is no need to set up an additional core-pulling structure. The structure is simple and easy to improve on existing injection molds.

[0006] According to some embodiments of the present invention, the injection mold further includes a second ejector pin, one end of which is mounted on the push plate and the other end of which is located in the cavity. The push plate can push the second ejector pin to move, thereby causing the second ejector pin to abut against the workpiece for demolding.

[0007] According to some embodiments of the present invention, the injection mold includes a positioning post, which is installed on the base plate. The positioning post is retractable relative to the upper surface of the base plate. The slider has a positioning hole on the side facing the base plate. When the first push rod abuts against the slider, the top end of the positioning post is located in the positioning hole.

[0008] According to some embodiments of the present invention, the injection mold further includes an installation part, which is fixedly installed on the side surface of the push plate facing the base plate. The installation part has a groove in the horizontal direction, and the slider is slidably disposed in the groove.

[0009] According to some embodiments of the present invention, the first push rod includes a first abutting surface, and the slider includes a second abutting surface. The first abutting surface is located above the second abutting surface. When the first push rod abuts against the slider, the first abutting surface abuts against the second abutting surface. From the slider toward the first push rod, the first abutting surface and the second abutting surface gradually slope downward relative to the horizontal plane.

[0010] According to some embodiments of the present invention, the first push rod includes a first section and a second section, the first section and the second section are detachably connected, the first section passes through the push plate, and the second section passes through the main template.

[0011] According to some embodiments of this utility model, the inclination angle of the inclined guide post relative to the vertical plane is α, where 15°≤α≤25°.

[0012] According to some embodiments of this utility model, the maximum length of the contact surface between the slider and the first push rod along the sliding direction is L, where 2mm≤L≤5mm.

[0013] According to some embodiments of the present invention, the injection mold further includes a limiting block, which is fixedly installed on the main template and abuts against the first ejector rod. The limiting block is used to restrict the first ejector rod from rotating around its own central axis.

[0014] According to some embodiments of the present invention, the injection mold includes a molding block, which is installed on the top of the first ejector pin. A molding groove is formed on the outer peripheral surface of the molding block in the vertical direction, and the molding groove is used to form the reinforcing ribs of the workpiece.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a partial top view of the injection mold in one embodiment of the present invention;

[0018] Figure 2 for Figure 1 Sectional view of section line AA in the middle;

[0019] Figure 3 for Figure 2 Enlarged view of region B in the middle;

[0020] Figure 4 for Figure 3 Enlarged view of region D in the middle;

[0021] Figure 5 for Figure 2 Enlarged view of region C in the middle;

[0022] Figure 6 This is a partial three-dimensional view of the injection mold in one embodiment of the present invention;

[0023] Figure 7 This is a perspective view of the molding block of an injection mold in one embodiment of the present invention;

[0024] Figure 8This is a partial perspective view of a workpiece molded by an injection mold in one embodiment of the present invention.

[0025] Reference numerals: Injection mold 100, base plate 101, push plate 102, main template 201, workpiece 202, inclined guide post 203, slider 204, first ejector rod 205, first section 206, second section 207, molding block 208, second ejector rod 209, cavity 210, positioning post 301, slide groove 302, first abutment surface 401, second abutment surface 402, limiting block 501, mounting part 601, molding groove 701, reinforcing rib 801. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] refer to Figures 1 to 3 According to an embodiment of the present invention, an injection mold 100 includes a main template 201, a push plate 102, a base plate 101, an inclined guide post 203, a slider 204, and a first ejector rod 205. The main template 201 has a cavity 210 for molding a workpiece 202. The push plate 102 is spaced apart from the main template 201. The base plate 101 is disposed on the side of the push plate 102 away from the main template 201. The bottom end of the inclined guide post 203 is fixedly installed on the base plate 101, and the top end of the inclined guide post 203 extends out from the end face of the base plate 101 facing the push plate 102. The slider 204 is sleeved on the inclined guide post 203 and is slidably installed on the side of the push plate 102 facing the base plate 101. The bottom end of the first ejector rod 205 abuts against the slider 204, and the top end of the first ejector rod 205 abuts against the workpiece 202. From bottom to top, the inclined guide post 203 moves away from the first ejector rod 205 along the horizontal plane. When the main mold plate 201 is opened, the push plate 102 pushes towards the main mold plate 201, thereby causing the slider 204 to push the first ejector rod 205, so that the top of the first ejector rod 205 pushes the workpiece 202. The slider 204 slides towards the top of the inclined guide post 203, thereby moving away from the first ejector rod 205. When the slider 204 disengages from the first ejector rod 205, the first ejector rod 205 stops moving.

[0032] In this embodiment of the invention, the first ejector pin 205 is used to eject complex parts of the workpiece 202, such as reinforcing ribs 801. By adding a set of sliders 204 and inclined guide posts 203 to the bottom end of the first ejector pin 205, the inclined guide posts 203 are mounted on a fixed base plate 101, and the sliders 204 are fitted onto the inclined guide posts 203 and abut against the first ejector pin 205. When the main mold plate 201 opens, the push plate 102 pushes forward, causing the sliders 204 to slide relative to the inclined guide posts 203. Since the inclined guide posts 203 gradually move away from the first ejector pin 205 from bottom to top, the sliders 204 slide forward... At the same time, it will gradually move away from the first ejector pin 205. After the pusher plate 102 pushes a certain distance, the slider 204 will disengage from the first ejector pin 205. At this time, the pusher plate 102 will no longer drive the first ejector pin 205 forward when it continues to push forward. Instead, the pusher plate 102 will drive other ejector pins in the injection mold 100 to continue to eject the workpiece 202 to demold it. Therefore, the workpiece 202 and the first ejector pin 205 will also move away from each other and demold, which solves the problem of difficult demolding of complex parts of the workpiece 202. Moreover, there is no need to set up an additional core-pulling structure. The structure is simple and easy to improve on the existing injection mold 100.

[0033] It should be noted that, Figure 1 , Figure 2 This is a partial schematic diagram of injection mold 100. Figure 2 Only the lower half of the main template 201 is shown. Furthermore, in some embodiments of this invention, the injection mold 100 also includes multiple ejector pins, push cylinders, and other structures. Figure 1 and Figure 2 Only the first ejector rod 205 and the parts connected to its two ends are shown in the illustration. The purpose is to better highlight the key points and illustrate the main improvements. In some embodiments of this utility model, there are multiple combinations of the first ejector rod 205, the slider 204, and the inclined guide post 203 to assist in the forming and demolding of multiple parts of the workpiece 202. Only one combination is shown in the figure for reference.

[0034] refer to Figure 2 In some embodiments of this utility model, the injection mold 100 further includes a second ejector pin 209. One end of the second ejector pin 209 is mounted on the push plate 102, and the other end of the second ejector pin 209 is located in the cavity 210. The push plate 102 can push the second ejector pin 209 to move, thereby causing the second ejector pin 209 to abut against the workpiece 202 for demolding. The first ejector pin 205 is mainly used for complex parts of the workpiece 202, such as... Figure 8The ejection of the reinforcing rib 801 at the end shown needs to be stopped after being pushed a certain distance. Therefore, the overall demolding of the workpiece 202 requires the push plate 102 to drive the second ejector rod 209 to continue to push forward. The second ejector rod 209 plays the main role in promoting the demolding of the workpiece 202. In some embodiments of this utility model, multiple second ejector rods 209 are provided, and multiple second ejector rods 209 abut against multiple positions of the workpiece 202 for ejection.

[0035] refer to Figure 2 , Figure 3 and Figure 6 In some embodiments of this utility model, the injection mold 100 includes a positioning post 301, which is mounted on the base plate 101. The positioning post 301 is retractable relative to the upper surface of the base plate 101. The slider 204 has a positioning hole on the side facing the base plate 101. When the first ejector rod 205 abuts against the slider 204, the top end of the positioning post 301 is located in the positioning hole. The positioning post 301 allows the first ejector rod 205 and the slider 204 to be positioned... Figure 2 In its initial state, the slider 204 exhibits reduced looseness and better stability. Its expandable nature also prevents the pusher plate 102 from sliding horizontally, pushing it downwards. Specifically, in some embodiments of this invention, the positioning post 301 is a ball-head plunger. A ball-head plunger typically consists of a ball head, a plunger, and a spring. Its overall structure is compact, occupies little space, and can be adjusted by changing the screw-in depth to adapt to different working conditions and positioning requirements. In some embodiments, spring plungers or other components can also be used as the positioning post 301.

[0036] refer to Figure 3 and Figure 6 In some embodiments of this utility model, the injection mold 100 further includes a mounting part 601, which is fixedly mounted on the side surface of the push plate 102 facing the base plate 101. The mounting part 601 has a groove 302 in the horizontal direction, and the slider 204 is slidably disposed in the groove 302. This design allows the slider 204 to be stably mounted on the push plate 102, making it less likely to fall off. The design of the groove 302 further guides the sliding of the slider 204, making it less likely to rotate horizontally during sliding, and allowing it to slide more smoothly. Figure 3 and Figure 4 The state shown slides to the left and then disengages from the first push rod 205.

[0037] refer to Figure 4In some embodiments of this utility model, the first push rod 205 includes a first abutting surface 401, and the slider 204 includes a second abutting surface 402. The first abutting surface 401 is located above the second abutting surface 402. When the first push rod 205 abuts against the slider 204, the first abutting surface 401 abuts against the second abutting surface 402. From the slider 204 toward the first push rod 205, the first abutting surface 401 and the second abutting surface 402 gradually tilt downward relative to the horizontal plane. In embodiments of this utility model, when the push plate 102 pushes upward, the slider 204 will move to the left. Therefore, the first abutting surface 401 and the second abutting surface 402 are designed as follows: Figure 4 As shown, the slider 204 gradually tilts downwards from left to right, making its leftward sliding process smoother and facilitating disengagement from the first ejector pin 205. During mold closing, the first abutment surface 401 guides the second abutment surface 402, ensuring it slides accurately below the first abutment surface 401. Furthermore, the tilted design reduces friction between the first ejector pin 205 and the slider 204 during mold opening and closing, extending the component's lifespan. In some embodiments of this invention, the edges of the first abutment surface 401 and the second abutment surface 402 are rounded to further reduce wear and extend service life.

[0038] refer to Figure 2 and Figure 6 In some embodiments of this utility model, the first push rod 205 includes a first segment 206 and a second segment 207, the first segment 206 and the second segment 207 are detachably connected, the first segment 206 passes through the push plate 102, and the second segment 207 passes through the main template 201. (Reference) Figure 2 The lower end of the first push rod 205 abuts against the slider 204 and is also provided with many corresponding parts. The upper end of the first push rod 205 is connected to the forming block 208. Therefore, the first push rod 205 is designed as a detachable first section 206 and a second section 207 to facilitate the disassembly and assembly of the first push rod 205, the main template 201, and the push rod. The first section 206 passes through the push plate 102 from bottom to top, and the second section 207 passes through the main template 201 from top to bottom for installation.

[0039] refer to Figure 3In some embodiments of this utility model, the inclination angle of the inclined guide post 203 relative to the vertical plane is α, where 15°≤α≤25°. The inclined guide post 203 is designed with a suitable slope to take into account the size and stroke requirements of the slider 204, inclined guide post 203, etc. in the injection mold 100. If the inclination angle of the inclined guide post 203 relative to the vertical plane is less than 15°, the inclination angle is too small, and the slider 204 needs to push upward for a large stroke before it has enough displacement in the horizontal direction, which is not conducive to timely disengagement from the first ejector pin 205. As a result, the first ejector pin 205 cannot disengage from the workpiece 202 well. If α is greater than 25°, the inclination angle is too large, and the slider 204 will disengage from the first ejector pin 205 in the horizontal direction when the upward stroke is relatively small. Therefore, the first ejector pin 205 cannot push the workpiece 202 upward for a sufficient distance, which may affect the demolding of the workpiece 202.

[0040] refer to Figure 4 In some embodiments of this utility model, the maximum length of the contact surface between the slider 204 and the first ejector 205 along the sliding direction is L, where 2mm ≤ L ≤ 5mm. Similarly, the length of the contact surface between the slider 204 and the first ejector 205 along the sliding direction can also determine the timing of the separation of the slider 204 and the first ejector 205. When L is less than 2mm, the length is too short, and the first ejector 205 separates too early, resulting in an insignificant pushing effect on the workpiece 202, which may affect the smooth demolding of the workpiece 202. When L is greater than 5mm, the length is too long, and the first ejector 205 separates too late, which is not conducive to the separation between the first ejector 205 and the workpiece 202.

[0041] refer to Figure 2 , Figure 5 and Figure 6 In some embodiments of this utility model, the injection mold 100 further includes a limiting block 501, which is fixedly installed on the main template 201. The limiting block 501 abuts against the first ejector rod 205 and is used to restrict the first ejector rod 205 from rotating around its own central axis. The limiting block 501 can prevent the first ejector rod 205 from rotating when moving within the main template 201, thereby preventing the upper molding block 208 from damaging the structure within the cavity 210 when resetting, effectively protecting the components from damage.

[0042] refer to Figure 2 , Figures 6 to 8In some embodiments of this utility model, the injection mold 100 includes a molding block 208, which is mounted on the top of a first ejector pin 205. A molding groove 701 is formed on the outer circumferential surface of the molding block 208 along a vertical direction. The molding groove 701 is used to form the reinforcing rib 801 of the workpiece 202. The outer surface of the molding block 208 can be well-defined with complex molding grooves 701, which then form complex parts such as the reinforcing rib 801 of the workpiece 202. The first ejector pin 205 pushes the molding block 208 upwards a certain distance and then stops moving, while other components such as the second ejector pin 209 continue to push the workpiece 202 out of the mold. Therefore, the reinforcing rib 801 of the workpiece 202 can also be smoothly ejected from the molding groove 701. It should be noted that in some embodiments of this utility model, the molding block 208 can also be defined with other types of molding grooves 701, and the forming part is not limited to the reinforcing rib 801 of the workpiece 202; it can also be other longer or more complex parts.

[0043] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. An injection mold, characterized in that, include: A main template having a cavity for forming a workpiece; Push plates, which are spaced apart from the main template; A base plate, wherein the base plate is disposed on the side of the push plate opposite to the main template; An inclined guide post, the bottom end of which is fixedly installed on the base plate, and the top end of which extends out of the end face of the base plate toward the push plate. A slider, which is sleeved on the inclined guide post and slidably mounted on the side of the push plate facing the bottom plate; The first push rod has its bottom end abutting against the slider and its top end abutting against the workpiece. From bottom to top, the inclined guide post moves away from the first push rod along the horizontal plane. When the main mold plate is opened, the push plate pushes towards the main mold plate, thereby causing the slider to push the first ejector rod, so that the top end of the first ejector rod pushes the workpiece. The slider slides towards the top end of the inclined guide post to move away from the first ejector rod. When the slider disengages from the first ejector rod, the first ejector rod stops moving.

2. The injection mold according to claim 1, characterized in that, The injection mold also includes a second ejector pin, one end of which is mounted on the push plate and the other end of which is located in the cavity. The push plate can push the second ejector pin to move, thereby causing the second ejector pin to press against the workpiece for demolding.

3. The injection mold according to claim 1, characterized in that, The injection mold includes a positioning post, which is mounted on the base plate. The positioning post is retractable relative to the upper surface of the base plate. The slider has a positioning hole on the side facing the base plate. When the first ejector rod abuts against the slider, the top of the positioning post is located in the positioning hole.

4. The injection mold according to claim 1, characterized in that, The injection mold also includes a mounting part, which is fixedly mounted on the side surface of the push plate facing the base plate. The mounting part has a groove in the horizontal direction, and the slider is slidably disposed in the groove.

5. The injection mold according to claim 1, characterized in that, The first push rod includes a first abutting surface, and the slider includes a second abutting surface. The first abutting surface is located above the second abutting surface. When the first push rod abuts against the slider, the first abutting surface abuts against the second abutting surface. From the slider toward the first push rod, the first abutting surface and the second abutting surface gradually slope downward relative to the horizontal plane.

6. The injection mold according to claim 1, characterized in that, The first push rod includes a first section and a second section, the first section and the second section are detachably connected, the first section passes through the push plate, and the second section passes through the main template.

7. The injection mold according to claim 1, characterized in that, The angle of inclination of the inclined guide post relative to the vertical plane is α, where 15°≤α≤25°.

8. The injection mold according to claim 7, characterized in that, The maximum length of the contact surface between the slider and the first push rod along the sliding direction is L, where 2mm ≤ L ≤ 5mm.

9. The injection mold according to claim 1, characterized in that, The injection mold also includes a limiting block, which is fixedly installed on the main template. The limiting block abuts against the first ejector rod and is used to restrict the first ejector rod from rotating around its own central axis.

10. The injection mold according to claim 1, characterized in that, The injection mold includes a molding block, which is installed at the top of the first ejector pin. A molding groove is formed on the outer peripheral surface of the molding block in the vertical direction. The molding groove is used to form the reinforcing ribs of the workpiece.

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