A small-volume plastic mold easy to demold

Abstract

The application discloses a small-size plastic mold easy to demold, which comprises an upper mold and a lower mold, the upper mold and the lower mold are connected movably in the up-down direction, and a cavity for forming a workpiece is defined between the upper mold and the lower mold; the lower mold comprises a male mold plate and a male mold core, the male mold core is movably connected with the male mold plate in the up-down direction, the male mold core and the upper mold define the cavity, and a slider assembly and an ejection assembly are movably arranged in the male mold core; the slider assembly is suitable for a reverse buckle part of the workpiece, and a top of the ejection assembly is suitable for abutting against the workpiece; in a first ejection process, the male mold core moves relative to the male mold plate, the slider assembly is separated from the reverse buckle part, the ejection assembly moves synchronously with the male mold core and remains relatively static; in a second ejection process, the ejection assembly moves relative to the male mold core, the top of the ejection assembly drives the workpiece to move, and the workpiece is separated from the male mold core.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mold, in particular to a small volume plastic mold easy to demold. BACKGROUND

[0002] At present, plastic workpieces are usually produced by injection molding through plastic molds. For some workpieces with many reverse buckles and complex structures, multiple direction different inclined top assemblies need to be arranged on the mold to facilitate the action of each inclined top assembly during ejection, so as to realize the demolding of the reverse buckle part on the workpiece, and then realize the ejection of the workpiece.

[0003] However, the existing plastic mold has the problems of difficult demolding, slow ejection speed, large volume, etc., which is difficult to adapt to the production of multi-cavity products, and is a problem to be solved by those skilled in the art. SUMMARY

[0004] One object of the present application is to provide a small volume plastic mold easy to demold and fast in demolding speed.

[0005] To achieve the above object, the technical scheme adopted by the present application is as follows: a small volume plastic mold easy to demold, comprising an upper mold and a lower mold, the upper mold and the lower mold defining a mold cavity for a molded workpiece, the lower mold comprising a male mold plate and a male mold core, the male mold core being movably connected with the male mold plate in the up-down direction, the male mold core and the upper mold defining the mold cavity, a sliding block assembly and an ejection assembly being movably arranged in the male mold core, the sliding block assembly being adapted to mold a reverse buckle part of the workpiece, the top of the ejection assembly being adapted to abut against the workpiece, in a first ejection process, the male mold core moves relative to the male mold plate, and the sliding block assembly is separated from the reverse buckle part, while the ejection assembly moves synchronously with the male mold core and remains relatively stationary; in a second ejection process, the ejection assembly moves relative to the male mold core, the top of the ejection assembly drives the workpiece to move, and the workpiece is separated from the male mold core.

[0006] It is worth mentioning that in the first ejection process, the ejection assembly moves synchronously with the male mold core and remains relatively stationary, which can make the bottom of the workpiece always abut against the top of the male mold core and the ejection assembly in the first ejection process, thereby increasing the contact area between the workpiece and the male mold core and the ejection assembly, and avoiding problems such as pin marks or deformation during ejection. In the second ejection process, the ejection assembly moves relative to the male mold core, which can facilitate the separation of the workpiece from the male mold core, thereby achieving the effect of fast demolding, and also effectively avoiding the problem of workpiece deformation.

[0007] The inventor further analyzes the reasons why the existing plastic mold has the problems of difficult demolding, slow ejection speed, large volume, etc.

[0008] (1)The inclined ejection assembly is generally driven by an inclined slider arranged on the ejection plate (the driving of the inclined ejection assembly by the inclined slider is prior art and will not be described here), and for a workpiece with multiple different direction reverse buckling parts, multiple inclined sliders need to be arranged on the ejection plate, in order to avoid interference, the volume of the ejection plate needs to be increased, thereby increasing the volume of the overall plastic mold.

[0009] (2)The inclined slider is connected with the inclined ejection assembly through a long ejector rod, and under a relatively fast ejection speed, the ejector rod is prone to bending or breaking, thereby limiting the ejection speed and demolding speed of the plastic mold, causing slow ejection speed and slow demolding speed.

[0010] The plastic mold of the present application movably connects the male die core and the male die plate, and sequentially adopts a primary ejection process and a secondary ejection process, and finally ejects the workpiece, which has the following advantages:

[0011] (1)Since no inclined slider assembly is arranged on the ejection plate, the volume of the required ejection plate is greatly reduced, thereby effectively reducing the volume of the plastic mold of the present application, thereby reducing the production and processing cost of the mold, and in the subsequent injection molding production process, a smaller injection molding machine can be selected for production, thereby further reducing the processing and manufacturing cost of the final product, and the arrangement of the slidable slider assembly in the male die core can fully utilize the volume of the male die core, thereby making the structure of the plastic mold of the present application more compact and further reducing the volume.

[0012] (2)And by directly driving the male die core to move, the slider assembly is driven to move, thereby separating the slider assembly from the reverse buckling part on the workpiece, compared with the method of separating the inclined ejection assembly from the reverse buckling part, the present application does not use an ejector rod, thereby increasing the ejection speed and effectively increasing the response speed, improving the ejection efficiency, and increasing the durability and reliability of the plastic mold of the present application;

[0013] (3)By arranging the ejection assembly, the demolding of the workpiece can be more conveniently and quickly achieved, specifically, by the primary ejection process, the slider assembly is separated from the reverse buckling part, by the secondary ejection process, the workpiece is separated from the male die core, in addition, during the primary ejection process, the workpiece is arranged on the top of the male die core and the ejection assembly, the contact area is large, and the ejector pin mark is not easy to produce, which affects the surface precision of the final molding; and during the primary ejection process, the workpiece and the male die core are not separated, preventing the demolding angle from changing due to gravity, causing product deformation and other problems.

[0014] Further preferably, the lower mold comprises a first ejection plate and a second ejection plate arranged in sequence from top to bottom, one end of the ejection assembly is mounted on the first ejection plate, the other end of the ejection assembly is movably connected with the male mold core in the up-down direction, a mold rod is upwardly protruding arranged on the second ejection plate, the mold rod sequentially passes through the first ejection plate and the male mold plate, and the top end of the mold rod abuts against the male mold core and pushes the male mold core to move relative to the male mold plate, a movable buckle assembly is arranged on the first ejection plate, a buckle seat is arranged on the second ejection plate, the buckle assembly is adapted to cooperate with the buckle seat and realize the separation or connection of the first ejection plate and the second ejection plate, an ejection rod of an injection molding machine is connected to the first ejection plate and is adapted to push the first ejection plate to move, when a one-time ejection process is performed, the buckle assembly and the buckle seat are in a connected state, at this time, the ejection rod pushes the first ejection plate and the second ejection plate to move upward together, and pushes the mold rod to move upward, and in turn pushes the male mold core to move relative to the male mold plate; when a two-time ejection process is performed, the buckle assembly and the buckle seat are in a separated state, at this time, the ejection rod can only push the first ejection plate to move upward, in turn causing the ejection assembly to move relative to the male mold core, and causing the workpiece to separate from the male mold core.

[0015] Further preferably, the buckle assembly is movably connected with the first ejection plate in the left-right direction, a locking spring is arranged between the buckle assembly and the first ejection plate, a locking groove adapted to accommodate the buckle assembly is arranged on the buckle seat in the left-right direction, a limiting assembly is downwardly protruding arranged on the lower part of the male mold plate, the limiting assembly is adapted to abut against the upper part of the buckle seat and limit the maximum distance of upward movement of the buckle seat; when it is needed to control the buckle assembly and the buckle seat to be in a connected state, the buckle assembly invades the locking groove under the driving of the locking spring, thereby causing the first ejection plate and the second ejection plate to move synchronously; when it is needed to control the buckle assembly and the buckle seat to be in a separated state, the first ejection plate is driven to move upward until the limiting assembly abuts against the upper part of the buckle seat and limits the buckle seat from continuing to move upward, at this time, the first ejection plate is further driven to move upward, thereby causing the buckle seat to press the buckle assembly and causing the buckle assembly to separate from the locking groove, thereby causing the first ejection plate and the second ejection plate to separate.

[0016] Further preferably, the lower part of the first ejection plate is provided with a ejection rod seat, the lower part of the ejection rod seat is downwardly protruding provided with a connecting part, the lower part of the connecting part is adapted to abut against the ejection rod of the injection molding machine, and the connecting part penetrates through the second ejection plate.

[0017] Further preferably, the male die stem is provided with a receiving groove, the sliding block assembly is slidably arranged in the receiving groove, and the side wall of the sliding block assembly is adapted to abut against the inner wall of the receiving groove, the receiving groove is adapted to drive the sliding block assembly to move when the male die stem moves upward, and the sliding block assembly is separated from the undercut portion.

[0018] Further preferably, the sliding block assembly comprises a first sliding block, the moving direction of the first sliding block forms an angle a with the opening and closing direction, 0°<a<90° is satisfied, the inner wall of the receiving groove is adapted to abut against the outer wall of the first sliding block and drive the first sliding block to move relative to the workpiece when the male die stem moves upward, and the male die plate is further provided with a first shovel base, the first shovel base is adapted to abut against the lower part of the first sliding block and limit the sliding distance of the first sliding block.

[0019] Further preferably, the sliding block assembly comprises a second sliding block, the moving direction of the second sliding block forms an angle β with the opening and closing direction, 0°<β<90° is satisfied, the inner wall of the receiving groove is adapted to abut against the outer wall of the second sliding block and drive the second sliding block to move relative to the workpiece when the male die stem moves upward, the male die stem is provided with a limiting block, the second sliding block is provided with a limiting groove matched with the limiting block, the limiting block is adapted to abut against the upper inner wall of the limiting groove and limit the maximum distance of downward movement of the second sliding block, and the male die plate is further provided with a second shovel base, the second shovel base is adapted to abut against the lower part of the second sliding block and limit the position of the second sliding block in the closed die state.

[0020] Further preferably, a driving spring is arranged between the second sliding block and the receiving groove, the arrangement direction of the driving spring is the same as the moving direction of the second sliding block, and the driving spring is in a compressed state when in the closed die state.

[0021] Further preferably, the male die plate is provided with a pulling block, the second sliding block is provided with a pulling block movable groove matched with the pulling block, the arrangement direction of the pulling block movable groove is the same as the moving direction of the second sliding block, the pulling block is adapted to abut against the lower inner wall of the pulling block movable groove and limit the displacement of the second sliding block when in the closed die state, and the pulling block is adapted to press the lower inner wall of the pulling block movable groove and gradually separate from the pulling block movable groove when in the first ejection state.

[0022] Further preferably, the ejection assembly has multiple groups and is arranged on the outer side of the inner wall of the cavity in a circumferential direction, and the ejection assembly is adapted to abut against the outside of the workpiece and eject the workpiece after the workpiece is formed.

[0023] Compared with the prior art, the application has the following beneficial effects:

[0024] (1) Since no inclined sliding block assembly is arranged on the ejection plate, the volume of the required ejection plate is greatly reduced, thereby effectively reducing the volume of the plastic mold of the present application, thereby reducing the production and processing cost of the mold, and in the subsequent injection molding production process, a smaller injection molding machine can be selected for production, thereby further reducing the processing and manufacturing cost of manufacturing the final product, and the slidable sliding block assembly arranged in the male core can fully utilize the volume of the male core, thereby making the structure of the plastic mold of the present application more compact and further reducing the volume;

[0025] (2) And by directly driving the male core to move, thereby driving the sliding block assembly to move, thereby separating the sliding block assembly from the undercut portion on the workpiece, compared with the method of separating the inclined ejector pin assembly from the undercut portion, the present application does not use the ejector pin, so that the ejection speed can be increased, and the response speed can be effectively increased, the ejection efficiency can be improved, and the durability and reliability of the plastic mold of the present application can be increased;

[0026] (3) By arranging the ejection assembly, the demolding of the workpiece can be more convenient and fast, specifically, the separation of the sliding block assembly and the undercut portion is realized by one-time ejection process, the separation of the workpiece and the male core is realized by two-time ejection process, in addition, in the one-time ejection process, the workpiece is arranged on the top of the male core and the ejection assembly, the contact area is large, and the ejector pin mark is not easy to produce, which affects the surface precision of the final molding; and in the one-time ejection process, the workpiece and the male core are not separated, so that the demolding angle change caused by gravity is prevented, and problems such as product deformation are caused. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic view of an embodiment of the mold of the present application, which shows the upper mold and the lower mold;

[0028] Figure 2 It is a schematic view of a workpiece produced by an embodiment of the mold of the present application, which shows that the cavity number is four;

[0029] Figure 3 It is a schematic view of a workpiece produced by an embodiment of the mold of the present application, which shows the undercut portion;

[0030] Figure 4 It is a schematic view of an embodiment of the mold of the present application, which shows the male core and the male plate;

[0031] Figure 5 It is a schematic view of an embodiment of the mold of the present application, which shows that the male core moves upward and separates from the male plate;

[0032] Figure 6 It is a schematic view of an embodiment of the mold of the present application, Figure 5 It is a partial enlarged view of position A, which shows that the ejection assembly and the male core are relatively static;

[0033] Figure 7 Partial enlarged view of position A in the middle of the embodiment of the mold of the present application, showing the ejection assembly and the male core in a relative displacement state; Figure 5

[0034] Figure 8 Schematic view of an embodiment of the mold of the present application, showing the first ejection plate and the second ejection plate;

[0035] Figure 9 Exploded view of an embodiment of the mold of the present application, showing the ejection assembly and the ejector rod;

[0036] Figure 10 Partial enlarged view of position B in the middle of the embodiment of the mold of the present application; Figure 9

[0037] Partial enlarged view of position C in the middle of the embodiment of the mold of the present application; Figure 11 Figure 9 Schematic view of an embodiment of the mold of the present application, showing the buckle assembly and the buckle seat in a connected state;

[0038] Figure 12 Cross-sectional view of an embodiment of the mold of the present application, showing the first ejection plate and the second ejection plate in a connected state;

[0039] Figure 13 Cross-sectional view of an embodiment of the mold of the present application, showing the buckle seat resisting and limiting assembly;

[0040] Figure 14 Cross-sectional view of an embodiment of the mold of the present application, showing the first ejection plate and the second ejection plate in a separated state;

[0041] Figure 15 Schematic view of an embodiment of the mold of the present application, showing the ejection assembly and the ejector rod;

[0042] Figure 16 Schematic view of an embodiment of the mold of the present application, showing the ejection assembly;

[0043] Figure 17 Cross-sectional view of an embodiment of the mold of the present application, showing the ejector rod seat;

[0044] Figure 18 Cross-sectional view of an embodiment of the mold of the present application, showing the ejection assembly;

[0045] Figure 19 Cross-sectional view of an embodiment of the mold of the present application, showing the ejection assembly;

[0046] Figure 20 ​​A sectional view of an embodiment of the mold of the present application, showing the ejector rod;

[0047] Figure 21 A schematic view of an embodiment of the mold of the present application, showing the first slider;

[0048] Figure 22 A schematic view of an embodiment of the mold of the present application, showing the second slider;

[0049] Figure 23 A schematic view of an embodiment of the mold of the present application, showing the second slider separated from the male core;

[0050] Figure 24 A schematic view of an embodiment of the mold of the present application, showing the second slider further separated from the male core;

[0051] Figure 25 A schematic view of an embodiment of the mold of the present application, showing the limiting block and the limiting slot;

[0052] Figure 26 A schematic view of an embodiment of the mold of the present application, showing the pull block and the pull block movable slot.

[0053] In the figure: 1, upper mold; 2, lower mold; 21, male core; 211, accommodating slot; 212, limiting block; 22, ejector assembly; 23, slider assembly; 231, first slider; 232, second slider; 2321, limiting slot; 2322, driving spring; 2323, pull block movable slot; 24, male mold plate; 241, limiting assembly; 242, first shovel base; 243, second shovel base; 244, pull block; 25, first ejector plate; 251, buckle assembly; 252, ejector rod seat; 2521, connecting part; 253, locking spring; 26, second ejector plate; 261, buckle seat; 2611, locking slot; 262, ejector rod; 3, cavity; 100, workpiece; 101, undercut portion. DETAILED DESCRIPTION

[0054] Hereinafter, the present application will be further described in conjunction with specific embodiments, and it should be noted that the following described embodiments or technical features can be combined in any manner to form new embodiments, without conflict.

[0055] In the description of the present application, it should be noted that for orientation words, such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0057] The terms "include" and "have" in the specification and claims of the present application, as well as any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0058] The inventor further analyzes the reasons for the existing plastic mold having the problems of difficult demolding, slow ejection speed, large volume, etc.:

[0059] (1) The inclined ejector assembly is usually driven by an inclined slider provided on the ejection plate (the inclined slider driving the inclined ejector assembly is prior art, which is not described here), and for the workpiece 100 having multiple different direction undercut portions 101, multiple inclined sliders need to be provided on the ejection plate. In order to avoid interference, the volume of the ejection plate needs to be increased, thereby increasing the volume of the overall plastic mold;

[0060] (2) The inclined slider is connected to the inclined ejector assembly through a top rod, and the length of the top rod is relatively long. At a faster ejection speed, the top rod is prone to bending or breaking, etc. Therefore, the ejection speed and demolding speed of the plastic mold are limited, causing the problems of slow ejection speed and slow demolding speed.

[0061] Therefore, the inventor of the present application has developed a small-volume, easy-to-demold plastic mold, and one embodiment thereof is as follows: Figures 1 to 26As shown, the mold includes an upper mold 1 and a lower mold 2, the upper mold 1 and the lower mold 2 define a cavity 3 for forming a workpiece 100, the lower mold 2 includes a male mold plate 24 and a male mold core 21, the male mold core 21 is movably connected with the male mold plate 24 in the up-down direction, the male mold core 21 and the upper mold 1 define the cavity 3, the male mold core 21 movably has a slider assembly 23 and an ejection assembly 22 arranged therein, the slider assembly 23 is suitable for a reverse buckle part 101 of the workpiece 100, a top of the ejection assembly 22 is suitable for abutting against the workpiece 100, when a first ejection process is performed, the male mold core 21 moves relative to the male mold plate 24, and the slider assembly 23 is separated from the reverse buckle part 101, while the ejection assembly 22 moves synchronously with the male mold core 21 and remains relatively static; when a second ejection process is performed, the ejection assembly 22 moves relative to the male mold core 21, so that the top of the ejection assembly 22 drives the workpiece 100 to move, and the workpiece 100 is separated from the male mold core 21.

[0062] It is worth mentioning that, as shown in Figure 2 and Figure 3 , the mold is a four-cavity mold, that is, four workpieces 100 are formed at one time, the workpiece 100 is provided with a plurality of reverse buckle parts 101 in different directions, the mold structure is large and the demolding speed is slow by using the design structure of the traditional plastic mold; while by using the plastic mold of the present application, the volume is greatly reduced, and the demolding speed is obviously improved. For the convenience of observation, only two male mold cores 21 are shown in the subsequent schematic diagrams to simplify the drawings, and four male mold cores 21 are actually needed to form four cavities 3 and simultaneously form four workpieces 100.

[0063] As shown in Figure 4 and Figure 5 , when the male mold core 21 is pushed upward in the arrow direction to move, the ejection assembly 22 on the male mold core 21 moves synchronously with the male mold core 21 and remains relatively static, as shown in Figure 5 and Figure 6 , the partial enlarged view of Figure 6 shows that the top of the ejection assembly 22 and the top of the male mold core 21 are in a relatively static state in the first ejection state, and there is no relative displacement between the two; as shown in Figure 7 , when the second ejection process is performed, the ejection assembly 22 is further driven to move upward, so that the top of the ejection assembly 22 protrudes from the top of the male mold core 21, so that the ejection assembly 22 can effectively eject the workpiece 100. It is easy to understand that the first ejection process is set to facilitate the movement of the male mold core 21, so as to force the slider assembly 23 in the male mold core 21 to move, so as to realize the separation of the slider assembly 23 and the reverse buckle part 101, as shown in Figures 21 to 24 .

[0064] It is worth mentioning that, in the first ejection process, keeping the ejection assembly 22 and the male die stem 21 in synchronous movement and maintaining relative static state can make the bottom of the workpiece 100 always contact the top of the male die stem 21 and the ejection assembly 22 in the first ejection process, thereby increasing the contact area of the workpiece 100 and the male die stem 21 and the ejection assembly 22, and avoiding problems such as pin marks or deformation during ejection. In the second ejection process, the ejection assembly 22 moves relative to the male die stem 21, which can facilitate the separation of the workpiece 100 and the male die stem 21, thereby achieving the effect of rapid demolding, and can also effectively avoid problems such as deformation of the workpiece 100.

[0065] The plastic mold of the present application has the following advantages:

[0066] (1) Since no inclined slide block assembly is provided on the ejection plate, the volume of the ejection plate required is greatly reduced, thereby effectively reducing the volume of the plastic mold of the present application, thereby reducing the production and processing cost of the mold, and in the subsequent injection molding production process, a smaller injection molding machine can be selected for production, thereby further reducing the processing and manufacturing cost of the final product, and the slidable slide block assembly 23 provided inside the male die stem 21 can make full use of the volume of the male die stem 21, thereby making the structure of the plastic mold of the present application more compact and further reducing the volume;

[0067] (2) And by directly driving the male die stem 21 to move, the slide block assembly 23 is driven to move, thereby separating the slide block assembly 23 from the undercut portion 101 on the workpiece 100. Compared with the demolding method of the inclined ejector assembly and the undercut portion 101, the present application does not use a ejector rod, so the ejection speed can be increased, the response speed can be effectively increased, the ejection efficiency can be improved, and the durability and reliability of the plastic mold of the present application can be increased;

[0068] (3) By providing the ejection assembly 22, the demolding of the workpiece 100 can be more convenient and efficient. Specifically, by the first ejection process, the slide block assembly 23 is separated from the undercut portion 101, and by the second ejection process, the workpiece 100 is separated from the male die stem 21. In addition, in the first ejection process, the workpiece 100 is arranged on the top of the male die stem 21 and the ejection assembly 22, and the contact area is large, so that pin marks are not easy to occur, and the surface precision of the final molding is not affected. In the first ejection process, the workpiece 100 and the male die stem 21 are not separated, which prevents the demolding angle from changing due to the action of gravity, causing the product to deform and other problems.

[0069] Further preferably, as Figure 17As shown, the ejection assembly 22 has multiple sets and is arranged on the outside of the inner wall of the cavity 3. When the workpiece 100 is formed, the ejection assembly 22 is suitable for abutting against the outside of the workpiece 100 and ejecting the workpiece 100. Multiple sets of ejection assemblies 22 are arranged, and the positions of the ejection assemblies 22 are located on the outside of the inner wall of the cavity 3. This can more conveniently make the top of the ejection assembly 22 abut against the outer periphery of the workpiece 100 in the secondary ejection process, and avoid forming a pin mark in the middle of the workpiece 100, affecting the appearance and flatness of the final product, and avoiding the problem of excessive deformation caused by middle ejection.

[0070] Further preferably, as Figure 8 、 Figure 9 、 Figure 18 、 Figure 19 、 Figure 20 As shown, the lower mold 2 includes a first ejection plate 25 and a second ejection plate 26 arranged in sequence from top to bottom. One end of the ejection assembly 22 is mounted on the first ejection plate 25, and the other end of the ejection assembly 22 is movably connected with the male mold core 21 in the up-down direction. The second ejection plate 26 is provided with a ejector rod 262 protruding upward. The ejector rod 262 sequentially passes through the first ejection plate 25 and the male mold plate 24, and the top end of the ejector rod 262 abuts against the male mold core 21 and pushes the male mold core 21 to move relative to the male mold plate 24. The first ejection plate 25 is provided with a movable buckle assembly 251, and the second ejection plate 26 is provided with a buckle seat 261. The buckle assembly 251 is suitable for cooperating with the buckle seat 261 to realize the separation or connection of the first ejection plate 25 and the second ejection plate 26. The ejector rod of the injection molding machine is connected to the first ejection plate 25 and is suitable for pushing the first ejection plate 25 to move. When the primary ejection process is performed, the buckle assembly 251 and the buckle seat 261 are in a connected state. At this time, the ejector rod pushes the first ejection plate 25 and the second ejection plate 26 to move upward together, and pushes the ejector rod 262 to move upward, and in turn pushes the male mold core 21 to move relative to the male mold plate 24. When the secondary ejection process is performed, the buckle assembly 251 and the buckle seat 261 are in a separated state. At this time, the ejector rod can only push the first ejection plate 25 to move upward, in turn making the ejection assembly 22 move relative to the male mold core 21, and making the workpiece 100 separate from the male mold core 21.

[0071] The first ejection plate 25 and the second ejection plate 26 are arranged in sequence from top to bottom, the ejection assembly 22 is arranged on the first ejection plate 25, the ejector rod 262 is arranged on the second ejection plate 26, and the ejector rod of the injection molding machine directly pushes the first ejection plate 25, so that the first ejection plate 25 and the second ejection plate 26 move together (both are in a connected state) in a one-time ejection process, at this time, the ejection assembly 22 and the ejector rod 262 move synchronously and maintain relative static state, thereby facilitating synchronous movement of the male die stem 21 and the ejection assembly 22 and relative static state, facilitating driving only the slider assembly 23 in this process to separate the slider assembly 23 from the undercut portion 101; in a two-time ejection process, the first ejection plate 25 can continue to move under the driving of the ejector rod, while the second ejection plate 26 is separated from the first ejection plate 25, the second ejection plate 26 cannot continue to move, thereby causing relative movement of the ejection assembly 22 and the ejector rod 262, so that the male die stem 21 and the ejection assembly 22 move relatively, and finally the ejection assembly 22 ejects the workpiece 100. This control mode makes the structure of the mold of the application more compact, the control is simpler, and multiple driving components do not need to be added, further reducing the cost of the mold of the application, and the movement of the first ejection plate 25 and the second ejection plate 26 is driven by the ejector rod on the injection molding machine, the control is simple, and the principle is also simple.

[0072] As shown in Figure 19 , one set of ejection assemblies 22 is shown, one end of which is mounted on the first ejection plate 25, and the other end is movably connected with the male die stem 21 in the up-down direction. When the first ejection plate 25 is driven to move upward, the ejection assembly 22 connected with the first ejection plate 25 will also move upward. Figure 20 As shown in Figure 20 , the ejector rod 262 is shown, one end of which is mounted on the second ejection plate 26, and the other end is connected to the bottom of the male die stem 21. When the second ejection plate 26 is driven to move upward, the ejector rod 262 connected with the second ejection plate 26 will also move upward, thereby pushing the male die stem 21 to move upward. When the movement speed of the first ejection plate 25 and the second ejection plate 26 is the same, the movement speed of the ejection assembly 22 and the ejector rod 262 is the same, and they maintain a relative static state. The same movement speed of the first ejection plate 25 and the second ejection plate 26 is realized by the buckle assembly 251 and the buckle seat 261. When the first ejection plate 25 and the second ejection plate 26 are connected with each other, the movement speed of the two is the same; when the first ejection plate 25 and the second ejection plate 26 are separated from each other, the two move relatively.

[0073] In addition, the locking and separation of the first ejection plate 25 and the second ejection plate 26 is realized by the buckle assembly 251 and the buckle seat 261. There are many different ways to realize this mechanical structure, and a preferred embodiment is disclosed below:

[0074] As shown in Figures 12 to 15As shown, the buckle assembly 251 is movably connected with the first ejection plate 25 in the left-right direction, and a locking spring 253 is arranged between the buckle assembly 251 and the first ejection plate 25. The buckle seat 261 is provided with a locking groove 2611 adapted to accommodate the buckle assembly 251 in the left-right direction. The lower part of the male die plate 24 is provided with a limiting assembly 241 protruding downward, which is adapted to abut against the upper part of the buckle seat 261 and limit the maximum distance of upward movement of the buckle seat 261. When it is required to control the buckle assembly 251 and the buckle seat 261 to be in the connected state, the buckle assembly 251 invades the locking groove 2611 under the driving of the locking spring 253, so as to make the first ejection plate 25 and the second ejection plate 26 move synchronously. When it is required to control the buckle assembly 251 and the buckle seat 261 to be in the separated state, the first ejection plate 25 is driven to move upward until the limiting assembly 241 abuts against the upper part of the buckle seat 261 and limits the buckle seat 261 from continuing to move upward. At this time, the first ejection plate 25 is further driven to move upward, so as to make the buckle seat 261 press the buckle assembly 251, and make the buckle assembly 251 separate from the locking groove 2611, thereby making the first ejection plate 25 and the second ejection plate 26 separate.

[0075] Figure 13 As shown, the buckle assembly 251 and the buckle seat 261 are in the connected state, wherein the end of the buckle assembly 251 invades the locking groove 2611 under the driving of the locking spring 253. At this time, the first ejection plate 25 is driven to move upward in the arrow direction, thereby making the first ejection plate 25 and the second ejection plate 26 move together. When the top of the buckle seat 261 abuts against the limiting assembly 241, the first ejection plate 25 is further driven to move upward. Figure 14 As shown, at this time, the buckle seat 261 will press the buckle assembly 251, and further press the locking spring 253, so as to make the end of the buckle assembly 251 separate from the locking groove 2611, thereby making the buckle assembly 251 and the buckle seat 261 separate. The first ejection plate 25 and the second ejection plate 26 are in the separated state. At this time, the second ejection plate 26 will not continue to move with the first ejection plate 25, so as to make the ejection assembly 22 and the ejector rod 262 relatively displace, thereby making the ejection assembly 22 relatively displace with the male die core 21, and realize the ejection and demolding of the workpiece 100.

[0076] Further preferably, as shown in Figure 18As shown, the lower part of the first ejection plate 25 is provided with a ejector pin seat 252, the lower part of the ejector pin seat 252 is provided with a connecting part 2521 protruding downward, the lower part of the connecting part 2521 is suitable for abutting against the ejector pin of the injection molding machine, and the connecting part 2521 penetrates the second ejection plate 26. By providing the ejector pin seat 252 and the protruding connecting part 2521 and making the connecting part 2521 penetrate the second ejection plate 26, the structure of the mold of the present application is more compact, and the connecting position of the ejector pin does not need to be arranged outside the first ejection plate 25 or arranged in the circumferential direction, so that the structure of the mold of the present application is more compact.

[0077] Further preferably, as Figures 21 to 24 shown, the male die stem 21 is provided with a receiving groove 211, the receiving groove 211 is slidably provided with a slider assembly 23, and the side wall of the slider assembly 23 is suitable for abutting against the inner wall of the receiving groove 211. When the male die stem 21 moves upward, the receiving groove 211 is suitable for driving the slider assembly 23 to move and separate the slider assembly 23 from the undercut part 101.

[0078] The slider assembly 23 has various different embodiments to meet the arrangement of the undercut part 101 in different directions, different sizes and different positions on the workpiece 100. The following gives several embodiments:

[0079] Embodiment one: as Figure 21 shown, the slider assembly 23 includes a first slider 231, the movement direction of the first slider 231 forms an angle a with the opening and closing direction, satisfying 0° < a < 90°. When the male die stem 21 moves upward, the inner wall of the receiving groove 211 is suitable for abutting against the outer wall of the first slider 231 and driving the first slider 231 to move relative to the workpiece 100. The male die plate 24 is further provided with a first shovel base 242, which is suitable for abutting against the lower part of the first slider 231 and limiting the sliding distance of the first slider 231.

[0080] It is worth mentioning that the movement direction of the first slider 231 forms an angle a with the opening and closing direction, and the above-mentioned movement direction refers to the movement direction relative to the male die stem 21. Since the male die stem 21 also moves in the vertical direction, the movement direction of the first slider 231 relative to the male die plate 24 is different from the movement direction relative to the male die stem 21. When the male die stem 21 moves upward in the direction of the arrow, the inner wall of the receiving groove 211 arranged inside the male die stem 21 will abut against the first slider 231 and drive the first slider 231 to move, so that the end of the first slider 231 is separated from the undercut part 101 on the workpiece 100 (not shown in the figure). Figure 21 In addition to limiting the sliding distance of the first slider 231, the first shovel base 242 can also limit the sliding direction of the first slider 231, and can effectively control the position of the first slider 231 in the closed state, so as to realize the resetting of the first slider 231.

[0081] Example 2: Figures 22 to 24 As shown, the slider assembly 23 includes a second slider 232. The movement direction of the second slider 232 forms an angle β with the mold opening and closing direction, satisfying 0° < β < 90°. When the male mold core 21 moves upward, the inner wall of the receiving groove 211 is adapted to abut against the outer wall of the second slider 232, driving the second slider 232 to move relative to the workpiece 100. A limiting block 212 is provided on the male mold core 21, and a limiting groove 2321 matching the limiting block 212 is provided on the second slider 232. The limiting block 212 is adapted to abut against the upper inner wall of the limiting groove 2321, limiting the maximum downward movement distance of the second slider 232. A second shovel base 243 is also provided on the male mold plate 24. The second shovel base 243 is adapted to abut against the lower part of the second slider 232, limiting the position of the second slider 232 in the mold closing state. It should be noted that the downward movement of the second slider 232 refers to the oblique downward direction, that is, the β direction.

[0082] When the male mold core 21 moves upward, the inner wall of the receiving groove 211 inside it will abut against the second slider 232, thereby driving the second slider 232 to move along the groove wall of the receiving groove 211. When the limiting block 212 has not yet abutted against the upper inner wall of the limiting groove 2321, as Figure 23 As shown, at this time, the second slider 232 will abut against the second shovel base 243 and move along the top of the second shovel base 243; when the limiting block 212 abuts against the upper inner wall of the limiting groove 2321, as shown... Figure 24 As shown, if the male mold core 21 continues to move upward, it will cause the second slider 232 to separate from the second shovel base 243. At this time, due to the setting of the limit block 212, the second slider 232 and the male mold core 21 can move together.

[0083] Further optimization, such as Figure 25 and Figure 26 As shown, a drive spring 2322 is provided between the second slider 232 and the receiving groove 211. The drive spring 2322 is positioned in the same direction as the movement direction of the second slider 232. When the mold is closed, the drive spring 2322 is in a compressed state. The drive spring 2322 makes the movement of the second slider 232 more stable and can share some of the influence of gravity, making the movement trajectory of the second slider 232 more stable. Additionally, it can increase the initial acceleration of the second slider 232, resulting in a faster demolding speed.

[0084] Further optimization, such as Figures 22 to 26As shown, the pull block 244 is arranged on the male die plate 24, and the second slide block 232 is arranged with a pull block movable slot 2323 matched with the pull block 244, the setting direction of the pull block movable slot 2323 is the same as the movement direction of the second slide block 232, when in the mold closing state, the pull block 244 is suitable to abut against the lower inner wall of the pull block movable slot 2323, and limit the displacement of the second slide block 232; when in the first ejection state, the pull block 244 is suitable to press the lower inner wall of the pull block movable slot 2323, and gradually separate from the pull block movable slot 2323. The arrangement of the pull block 244 and the pull block movable slot 2323 can keep the second slide block 232 moving and abutting against the second shank 243, through the pull block 244 suitable to press the lower inner wall of the pull block movable slot 2323, so that the second slide block 232 always presses the second shank 243, thereby avoiding the second slide block 232 moving towards other directions, and effectively realizing the separation of the second slide block 232 and the male die stem 21 (since the pull block 244 is installed on the male die plate 24, during the first ejection process, the male die plate 24 and the male die stem 21 will move relatively).

[0085] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, the above-mentioned embodiments and descriptions in the specification are only the principles of the present application, various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A small-volume, easily demolded plastic mold, comprising an upper mold and a lower mold, wherein a cavity for forming a workpiece is defined between the upper mold and the lower mold, characterized in that: The lower mold includes a male mold plate and a male mold core. The male mold core is movably connected to the male mold plate in the vertical direction. The cavity is defined between the male mold core and the upper mold. A slider assembly and an ejection assembly are movably disposed within the male mold core. The slider assembly is adapted to form the undercut portion of the workpiece. The top of the ejection assembly is adapted to abut against the workpiece. During the first ejection process, the male mold core moves relative to the male mold plate, causing the slider assembly to separate from the undercut portion, while maintaining the synchronous movement of the ejection assembly and the male mold core and keeping them relatively stationary. During the second ejection process, the ejection assembly moves relative to the male mold core, causing the top of the ejection assembly to drive the workpiece to move and separate the workpiece from the male mold core. The male mold core is provided with a receiving groove, and the slider assembly is slidably disposed in the receiving groove. The side wall of the slider assembly is adapted to abut against the inner wall of the receiving groove. When the male mold core moves upward, the receiving groove is adapted to drive the slider assembly to move and separate the slider assembly from the undercut portion. The slider assembly includes a first slider, the movement direction of the first slider forms an angle α with the mold opening and closing direction, satisfying 0° < α < 90°. When the male mold core moves upward, the inner wall of the receiving groove is adapted to abut against the outer wall of the first slider and drive the first slider to move relative to the workpiece. The male mold core is also provided with a first shovel base, the first shovel base is adapted to abut against the lower part of the first slider and limit the sliding distance of the first slider. The slider assembly includes a second slider, the movement direction of the second slider forming an angle β with the mold opening and closing direction, satisfying 0° < β < 90°. When the male mold core moves upward, the inner wall of the receiving groove is adapted to abut against the outer wall of the second slider and drive the second slider to move relative to the workpiece. A limiting block is provided on the male mold core, and a limiting groove matching the limiting block is provided on the second slider. The limiting block is adapted to abut against the upper inner wall of the limiting groove and limit the maximum distance of the second slider moving downward. A second shovel base is also provided on the male mold core. The second shovel base is adapted to abut against the lower part of the second slider and limit the position of the second slider in the mold closing state.

2. The small-volume, easily demolded plastic mold as described in claim 1, characterized in that: The lower mold includes a first ejector plate and a second ejector plate arranged sequentially from top to bottom. One end of the ejector assembly is mounted on the first ejector plate, and the other end of the ejector assembly is movably connected to the male mold core in a vertical direction. An ejector rod protrudes upward from the second ejector plate, passing through the first ejector plate and the male mold core sequentially. The top end of the ejector rod abuts against the male mold core and pushes the male mold core to move relative to the male mold core. A movable snap-fit ​​assembly is provided on the first ejector plate, and a snap-fit ​​seat is provided on the second ejector plate. The snap-fit ​​assembly is adapted to cooperate with the snap-fit ​​seat to realize the movement of the first ejector plate and the second ejector plate. The ejector rod of the injection molding machine is connected to the first ejector plate and is adapted to push the first ejector plate to move. During the first ejection process, the latching assembly and the latching seat are in a connected state. At this time, the ejector rod pushes the first ejector plate and the second ejector plate to move upward together, and pushes the ejector rod to move upward, thereby pushing the male mold core to move relative to the male mold plate. When the second ejection process is performed, the latching assembly and the latching seat are in a separated state. At this time, the ejector rod can only push the first ejector plate to move upward, thereby causing the ejector assembly to move relative to the male mold core and separating the workpiece from the male mold core.

3. A small-volume, easily demolded plastic mold as described in claim 2, characterized in that: The latching assembly is movably connected to the first ejector plate in the left-right direction. A locking spring is provided between the latching assembly and the first ejector plate. A locking groove suitable for accommodating the latching assembly is provided on the latching seat in the left-right direction. A limiting component is provided with a downward protrusion at the lower part of the male template. The limiting component is adapted to abut against the upper part of the latching seat and limit the maximum upward movement distance of the latching seat. When it is necessary to control the latching assembly and the latching seat to be in a connected state, the latching assembly enters the locking groove under the drive of the locking spring, thereby causing the first ejector plate and the second ejector plate to move synchronously. When it is necessary to control the latching assembly and the latching seat to be in a separated state, the first ejector plate is driven to move upward until the limiting component abuts against the upper part of the latching seat and limits the latching seat from continuing to move upward. At this time, the first ejector plate is further driven to move upward, thereby causing the latching seat to press the latching assembly and separate the latching assembly from the locking groove, thereby causing the first ejector plate and the second ejector plate to separate.

4. A small-volume, easily demolded plastic mold as described in claim 2, characterized in that: The lower part of the first ejector plate is provided with an ejector rod seat, and the lower part of the ejector rod seat is provided with a connecting part protruding downward. The lower part of the connecting part is adapted to abut against the ejector rod of the injection molding machine, and the connecting part passes through the second ejector plate.

5. A small-volume, easily demolded plastic mold as described in claim 1, characterized in that: A drive spring is provided between the second slider and the receiving groove. The drive spring is positioned in the same direction as the movement direction of the second slider. When the mold is closed, the drive spring is in a compressed state.

6. A small-volume, easily demolded plastic mold as described in claim 5, characterized in that: The male template is provided with a pull block, and the second slider is provided with a pull block movable groove that matches the pull block. The direction of the pull block movable groove is the same as the direction of movement of the second slider. When the mold is closed, the pull block is adapted to abut against the lower inner wall of the pull block movable groove and restrict the displacement of the second slider. When the mold is ejected once, the pull block is adapted to press against the lower inner wall of the pull block movable groove and gradually separate from the pull block movable groove.

7. A small-volume, easily demolded plastic mold as described in claim 1, characterized in that: The ejection assembly has multiple sets arranged circumferentially on the outer side of the inner wall of the cavity. After the workpiece is formed, the ejection assembly is adapted to abut against the outside of the workpiece and eject the workpiece.

Images