A self-separating device for sprue of injection mold

Abstract

The application discloses a self-separating device for a sprue of an injection mold, comprising a base and a top plate; a cutting assembly for cutting the sprue, the cutting assembly comprising a plurality of first slide rods, the plurality of first slide rods corresponding to the mold cavity one by one, and each of the plurality of first slide rods being provided with a cutting edge; and a transmission assembly for driving the cutting edge on the first slide rod to cut the sprue when demolding, so that when the upper mold and the lower mold are separated, the transmission assembly drives the first slide rod in the cutting assembly, the cutting edge on the first slide rod cuts the sprue, the sprue is separated without the need of pulling force between the molds, the product that has not completely cooled is prevented from being deformed, the problem that marks are easily left on the product when the sprue is cut and then demolded is avoided, the product is prevented from being damaged in the process of separating the sprue and demolding, and the quality of the product is improved.

Description

Technical Field

[0001] This invention relates to the field of injection molding product manufacturing technology, and specifically to a self-separating device for the gate of an injection mold. Background Technology

[0002] Injection molding is a processing method used for mass production of certain complex-shaped parts. Specifically, it refers to injecting molten material under high pressure into a mold cavity, which then cools and solidifies to obtain a molded product. However, after the product has been injection molded and cooled, the gate needs to be separated after demolding.

[0003] For example, the Chinese patent with authorization announcement number "CN114474570A" and title "A Mechanical Gate Cut-off Structure" includes a stripper plate and a mother template. A male mold for the sprue head is provided on the side of the stripper plate facing the mother template, and a female mold for the sprue head is provided on the side of the mother template facing the stripper plate. The gap between the male mold for the sprue head and the female mold for the sprue head forms a cavity. A coarse runner is provided on the stripper plate, extending from the side of the stripper plate away from the mother template to the cavity. A product mother mold is provided on the side of the mother template away from the stripper plate. A narrow runner is provided on the mother template, penetrating the mother template and connecting the outside of the product mother mold to the cavity. The mechanical gate cut-off structure also includes an undercut provided between the stripper plate and the mother template. The execution end of the undercut fits against the sprue head mother mold and is inserted into the cavity. This application solves the technical problem of how to automatically pull the sprue head and the product apart when the mold is opened, and at the same time separate the sprue head from the stripper plate and the mother template, so that the sprue head automatically detaches from the mold.

[0004] The shortcomings of the existing technology are: when using a three-plate mold for injection molding, although the gate can be automatically separated during demolding, the separation force comes from the tension between the mold plates, which is simply a tear. This leaves gate separation marks on the product surface. For some products with thin sidewalls that have just cooled and solidified, it may even cause deformation, affecting product quality. Summary of the Invention

[0005] The purpose of this invention is to provide a self-separating device for injection mold gates to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A self-separating device for the gate of an injection mold includes a base and a top plate, wherein a support plate is provided between the base and the top plate, and both ends of the support plate are fixedly connected to the base and the top plate respectively.

[0008] It also includes an upper mold and a lower mold, with multiple mold cavities formed between the upper mold and the lower mold;

[0009] A cutting assembly for cutting the gate, the cutting assembly includes a plurality of first slide rods, each of which corresponds to a mold cavity, and each of the plurality of first slide rods is provided with a cutting edge;

[0010] It also includes a transmission assembly that drives the blades on the first slide to cut the gate during demolding.

[0011] Preferably, a push rod is slidably disposed on the lower mold, and a connecting rod is disposed between the push rod and the first slide rod, with the two ends of the connecting rod being rotatably connected to the push rod and the first slide rod, respectively.

[0012] Preferably, the transmission assembly includes a second slide rod slidably disposed on the lower mold, a trapezoidal block fixedly disposed on the second slide rod, and a roller rotatably disposed on the push rod, wherein the roller contacts the trapezoidal block.

[0013] Preferably, an inclined block is fixedly provided on the support plate, and the inclined block is in contact with one end of the second sliding rod;

[0014] A first spring is provided between the second slide bar and the lower mold, and the two ends of the first spring are fixedly connected to the second slide bar and the lower mold, respectively.

[0015] Preferably, a scroll is rotatably mounted on the lower mold, and a torsion spring is provided between the scroll and the lower mold. A connecting rope is provided between the scroll and the push rod, and the two ends of the connecting rope are fixedly connected to the scroll and the push rod respectively, and are wound on the scroll.

[0016] Preferably, a nozzle is fixedly provided on the top plate, and a sprue is formed between the top plate and the upper mold. The sprue is connected to the cutting edge, and the cutting edge is connected to the mold cavity.

[0017] Preferably, a pressure block and a third sliding rod are slidably disposed on the top plate, and both the pressure block and the third sliding rod are provided with inclined surfaces and contact each other through the inclined surfaces;

[0018] An extrusion rod is fixedly installed on the lower mold, and the extrusion rod is provided with an inclined surface, which contacts the third sliding rod through the inclined surface;

[0019] A push plate is fixedly installed on the push rod.

[0020] Preferably, a third spring is provided between the pressure block and the top plate, and the two ends of the third spring are fixedly connected to the pressure block and the top plate respectively.

[0021] Preferably, a top plate is slidably provided on the lower mold, and a plurality of ejector pins are provided on the lifting plate. A second spring is provided between the ejector pins and the lower mold, and the two ends of the second spring are fixedly connected to the ejector pins and the lifting plate, respectively.

[0022] A top column is fixedly installed on the base, and the top column is slidably connected to the lower mold.

[0023] Preferably, a drive motor is fixedly mounted on the top plate, a first screw is fixedly mounted on the motor shaft of the drive motor, a second screw is fixedly mounted on the first screw, a first connecting block is threadedly connected to the first screw and the first connecting block is fixedly connected to the upper mold, and the second screw is threadedly connected to the second connecting block and the second connecting block is fixedly connected to the lower mold.

[0024] The pitch of the first screw is smaller than the pitch of the second screw.

[0025] In the above technical solution, the self-separation device for injection mold gate provided by the present invention has the following beneficial effects:

[0026] 1. In this embodiment, by setting a cutting component and a transmission component, during demolding, while the upper mold separates from the lower mold, the transmission component drives the first slide rod in the cutting component to cut the gate with the cutting edge on the first slide rod. This avoids the need to use the tension between the molds to separate the gate, which would cause the product to deform before it has fully cooled. It also avoids the problem of leaving marks on the product when cutting the gate before demolding. This avoids damage to the product during the gate separation and demolding process, thus improving the quality of the product.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0028] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0030] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the overall internal structure provided in an embodiment of the present invention;

[0032] Figure 3 This is an overall cross-sectional view provided for an embodiment of the present invention;

[0033] Figure 4This is an enlarged view of point A provided in an embodiment of the present invention;

[0034] Figure 5 This is an enlarged view of section B provided in an embodiment of the present invention;

[0035] Figure 6 This is an enlarged view of point C provided in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the transmission component structure provided in an embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of the cutting component structure provided in an embodiment of the present invention;

[0038] Figure 9 This is a schematic diagram of the pressing block structure provided in an embodiment of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Base; 11. Top plate; 12. Support plate; 13. Top column; 14. Nozzle; 15. Inclined block; 2. Upper mold; 21. Extrusion rod; 3. Lower mold; 4. Push rod; 41. First slide rod; 42. Cutting edge; 43. Connecting rod; 44. Push plate; 45. Roller; 5. Second slide rod; 51. First spring; 52. Trapezoidal block; 6. Roller; 61. Connecting rope; 7. Lifting plate; 71. Ejector pin; 72. Second spring; 8. Pressure block; 81. Third slide rod; 82. Third spring; 9. Drive motor; 91. First screw; 92. First connecting block; 93. Second screw; 94. Second connecting block. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0042] Please refer to 1-9. A self-separating device for injection mold gates includes a base 1 and a top plate 11, with a support plate 12 disposed between the base 1 and the top plate 11, and both ends of the support plate 12 being fixedly connected to the base 1 and the top plate 11 respectively; it also includes an upper mold 2 and a lower mold 3, forming multiple mold cavities between the upper mold 2 and the lower mold 3; a cutting assembly for cutting the gate, the cutting assembly including multiple first slide rods 41, each of the multiple first slide rods 41 corresponding to a mold cavity, and each of the multiple first slide rods 41 being provided with a cutting edge 42; and a transmission assembly for driving the first slide rods 42 during demolding. The cutting edge 42 on the rod 41 cuts the gate. In this embodiment, by setting a cutting component and a transmission component, when demolding, while the upper mold 2 and the lower mold 3 are separated, the transmission component drives the first slide rod 41 in the cutting component, so that the cutting edge 42 on the first slide rod 41 cuts the gate. This avoids the need to use the tension between the molds to separate the gate, which would cause the product to deform before it has fully cooled. It also avoids the problem of leaving marks on the product when the gate is cut before demolding. This avoids damage to the product during the gate separation and demolding process and improves the quality of the product.

[0043] Specifically, a push rod 4 is slidably mounted on the lower mold 3, and a connecting rod 43 is provided between the push rod 4 and the first slide rod 41. The two ends of the connecting rod 43 are rotatably connected to the push rod 4 and the first slide rod 41, respectively. In this embodiment, by setting the push rod 4 and connecting it to the first slide rod 41 through the connecting rod 43, when the push rod 4 slides upward, it can push the first slide rod 41 through the connecting rod 43, causing the first slide rod 41 to slide and use the cutting edge 42 on the first slide rod 41 to cut the gate. It should be noted that during injection molding, the cutting edge 42 keeps the gate and the mold cavity in a connected state.

[0044] In a further embodiment of the present invention, the transmission assembly includes a second slide rod 5 slidably disposed on the lower mold 3, a trapezoidal block 52 fixedly disposed on the second slide rod 5, and a roller 45 rotatably disposed on the push rod 4, with the roller 45 in contact with the trapezoidal block 52. In this embodiment, by setting the trapezoidal block 52 and cooperating with the roller 45, the roller 45 can be resisted by the trapezoidal block 52 when the second slide rod 5 slides laterally. When the second slide rod 5 slides, the roller 45 rotates and reduces friction, allowing the second slide rod 5 to continue sliding. As the roller 45 gradually rolls onto the trapezoidal block 52, the push rod 4 slides upward, driving the cutting assembly.

[0045] Furthermore, a wedge block 15 is fixedly installed on the support plate 12, and the wedge block 15 contacts one end of the second slide rod 5; a first spring 51 is installed between the second slide rod 5 and the lower mold 3, and the two ends of the first spring 51 are fixedly connected to the second slide rod 5 and the lower mold 3 respectively. By setting the wedge block 15, the end of the second slide rod 5 that contacts the wedge block 15 is provided with a slope, so that the slope contacts the wedge block 15, so that when the lower mold 3 moves, the wedge block 15 better abuts against the second slide rod 5, so that the second slide rod 5 slides to drive the push rod 4.

[0046] Furthermore, a scroll 6 is rotatably mounted on the lower mold 3, and a torsion spring is provided between the scroll 6 and the lower mold 3. A connecting rope 61 is provided between the scroll 6 and the push rod 4. The two ends of the connecting rope 61 are fixedly connected to the scroll 6 and the push rod 4 respectively, and are wound around the scroll 6. In this embodiment, by setting the scroll 6 and providing the connecting rope 61 between the scroll 6 and the push rod 4, after the push rod 4 slides upward, the scroll 6 can reset the push rod 4 through the connecting rope 61 by the force of the torsion spring between the scroll 6 and the lower mold 3.

[0047] In a further embodiment of the present invention, a nozzle 14 is fixedly provided on the top plate 11, and a sprue is formed between the top plate 11 and the upper mold 2. The sprue is connected to the cutting edge 42, and the cutting edge 42 is connected to the mold cavity. In this embodiment, during injection molding, the sprue is connected to the mold cavity through the cutting edge 42, and the cutting edge 42 is an annular cutting edge 42, so that during injection molding, the injection material is prevented from seeping into the gap between the first slide rod 41 and the upper mold 2. After injection molding, the sprue can be directly cut by sliding the first slide rod 41.

[0048] In the embodiments provided by the present invention, a pressure block 8 and a third slide rod 81 are slidably disposed on the top plate 11, and both the pressure block 8 and the third slide rod 81 are provided with inclined surfaces and contact each other through the inclined surfaces; an extrusion rod 21 is fixedly disposed on the lower mold 3, and the extrusion rod 21 is provided with inclined surfaces and contacts the third slide rod 81 through the inclined surfaces; a push plate 44 is fixedly disposed on the push rod 4. In this embodiment, the extrusion rod 21 fixedly disposed on the upper mold 2 allows the upper mold 2 to separate from the lower mold 3. The extrusion rod 21 fixedly disposed on the upper mold 2 can push the third slide rod 81, and at the same time the third slide rod 81 pushes the pressure block 8 downward, so that the pressure block 8 presses the gate and separates the gate from the top plate 11.

[0049] Specifically, a third spring 82 is provided between the pressure block 8 and the top plate 11, and the two ends of the third spring 82 are fixedly connected to the pressure block 8 and the top plate 11 respectively. In this embodiment, by providing a third spring 82 between the pressure block 8 and the top plate 11, the third spring 82 is compressed when the pressure block 8 slides downward. After the pressing rod 21 disengages from the third sliding rod 81 and the pressure block 8 loses the thrust aligned with the third sliding rod 81, the pressure block 8 resets under the restoring force of the third spring 82.

[0050] In a further embodiment of the present invention, a lifting plate 7 is slidably mounted on the lower mold 3, and a plurality of ejector pins 71 are mounted on the lifting plate 7. A second spring 72 is mounted between the ejector pins 71 and the lower mold 3, and the two ends of the second spring 72 are fixedly connected to the ejector pins 71 and the lifting plate 7, respectively. A top post 13 is fixedly mounted on the base 1, and the top post 13 is slidably connected to the lower mold 3. By mounting the top post 13, when the lifting plate 7 slides down to a specific position with the lower mold 3, the lifting plate 7 contacts the top post 13. At this time, the lower mold 3 continues to slide down, the second spring 72 is compressed, and the ejector pins 71 on the lifting plate 7 push the solidified product, causing it to detach from the lower mold 3.

[0051] In this invention, a drive motor 9 is fixedly mounted on the top plate 11. A first screw 91 is fixedly mounted on the motor shaft of the drive motor 9, and a second screw 93 is fixedly mounted on the first screw 91. A first connecting block 92 is threadedly connected to the first screw 91, and the first connecting block 92 is fixedly connected to the upper mold 2. A second connecting block 94 is threadedly connected to the second screw 93, and the second connecting block 94 is fixedly connected to the lower mold 3. The pitch of the first screw 91 is smaller than the pitch of the second screw 93. In this embodiment, by setting a fixed connection of the first screw 91... The screws 91 and 93 facilitate the sliding of the upper mold 2 and lower mold 3 via the drive motor 9, and synchronize the sliding of the upper mold 2 and lower mold 3. Furthermore, the pitch of the first screw 91 is less than the pitch of the second screw 93. This allows the lower mold 3 to move a greater distance than the upper mold 2 after the drive motor 9 has rotated a fixed number of times, thus increasing the distance between the upper mold 2 and lower mold 3 and facilitating demolding of the cured product.

[0052] Working principle: During injection molding, the raw material is first injected through nozzle 14 and then enters the mold cavity through the sprue. After injection, it is cooled and solidified. After solidification, the drive motor 9 starts, driving the first screw 91 and the second screw 93 to rotate simultaneously. The upper mold 2 and the lower mold 3 move downwards simultaneously. Because the pitch of the first screw 91 is smaller than that of the second screw 93, the displacement of the lower mold 3 is longer than the movement path of the upper mold 2 in the same amount of time. Therefore, the upper mold 2 and the lower mold 3 will also separate. While the upper mold 2 and the lower mold 3 are moving downwards... Under the action of the inclined surface on the extrusion rod 21, the third slide rod 81 slides inward, pushing the pressure block 8 to compress the third spring 82. The pressure block 8 slides down to press the gate, causing the gate to detach from the top plate 11. At the same time, the second slide rod 5 moves down with the lower mold 3. The inclined end of the second slide rod 5 contacts the inclined block 15 on the support plate 12, causing the second slide rod 5 to slide inward. While sliding, the first spring 51 is compressed, and the trapezoidal block 52 contacts the roller 45, causing the push rod 4 to slide upward. Under the action of the push rod 4, the connecting rod 43 pushes the first slide rod 41 to both sides, causing the cutter... The gate 42 cuts the gate, and at the same time, the solidified product separates from the upper mold 2 under the action of the first sliding action. As the push rod 4 slides, the push plate 44 pushes the gate away from the upper mold 2, thus completing the demolding of the gate. Then, the drive motor 9 continues to rotate. As the lower mold 3 continues to slide downward, the ejector pin 13 abuts against the lifting plate 7. At this time, the lifting plate 7 stops moving downward. As the lower mold 3 continues to slide downward, the second spring 72 is compressed, and the ejector pin 71 on the lifting plate 7 abuts against the solidified product on the lower mold 3, causing it to separate from the lower mold 3. Demolding can then be completed; while the upper mold 2 continues to slide downwards, the roller 6 overcomes the force of the torsion spring, loosens the connecting rope 61, and causes the push rod 4 to move upwards relative to the lower mold 3. When the distance between the upper mold 2 and the lower mold 3 decreases, the roller 6 reverses under the action of the torsion spring, pulling the push rod 4 to reset it; after the above-mentioned cutting of the gate and demolding of the solidified product, the drive motor 9 reverses to reset the overall shape during injection molding, so that the next injection molding can be performed. The principle of resetting the overall shape by reversing the drive motor 9 is the opposite of the principle of the drive motor 9 rotating forward.

[0053] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A self-separating device for the gate of an injection mold, comprising a base (1) and a top plate (11), characterized in that, A support plate (12) is provided between the base (1) and the top plate (11), and the two ends of the support plate (12) are fixedly connected to the base (1) and the top plate (11) respectively. It also includes an upper mold (2) and a lower mold (3), wherein multiple mold cavities are formed between the upper mold (2) and the lower mold (3); A cutting assembly for cutting the gate, the cutting assembly includes a plurality of first slide rods (41), each of the plurality of first slide rods (41) corresponding to a mold cavity, and each of the plurality of first slide rods (41) is provided with a cutting edge (42). It also includes a transmission assembly for driving the blade (42) on the first slide bar (41) to cut the gate during demolding; A push rod (4) is slidably provided on the lower mold (3), and a connecting rod (43) is provided between the push rod (4) and the first slide rod (41). The two ends of the connecting rod (43) are rotatably connected to the push rod (4) and the first slide rod (41) respectively. The transmission assembly includes a second slide rod (5) slidably disposed on the lower mold (3), a trapezoidal block (52) fixedly disposed on the second slide rod (5), and a roller (45) rotatably disposed on the push rod (4), and the roller (45) is in contact with the trapezoidal block (52); An inclined block (15) is fixedly installed on the support plate (12), and the inclined block (15) is in contact with one end of the second slide rod (5); A first spring (51) is provided between the second slide bar (5) and the lower mold (3), and the two ends of the first spring (51) are fixedly connected to the second slide bar (5) and the lower mold (3) respectively; A pressure block (8) and a third slide rod (81) are slidably arranged on the top plate (11), and both the pressure block (8) and the third slide rod (81) are provided with inclined surfaces and are in contact through the inclined surfaces; An extrusion rod (21) is fixedly provided on the lower mold (3), and an inclined surface is provided on the extrusion rod (21), which contacts the third slide rod (81) through the inclined surface; A push plate (44) is fixedly installed on the push rod (4).

2. The self-separation device for the injection mold gate according to claim 1, characterized in that, A spool (6) is rotatably mounted on the lower mold (3), and a torsion spring is provided between the spool (6) and the lower mold (3). A connecting rope (61) is provided between the spool (6) and the push rod (4). The two ends of the connecting rope (61) are fixedly connected to the spool (6) and the push rod (4) respectively, and are wound around the spool (6).

3. The self-separation device for the injection mold gate according to claim 1, characterized in that, A nozzle (14) is fixedly provided on the top plate (11), and a sprue is formed between the top plate (11) and the upper mold (2). The sprue is connected to the cutting edge (42), and the cutting edge (42) is connected to the mold cavity.

4. The self-separation device for the injection mold gate according to claim 1, characterized in that, A third spring (82) is provided between the pressure block (8) and the top plate (11), and the two ends of the third spring (82) are fixedly connected to the pressure block (8) and the top plate (11) respectively.

5. The self-separation device for the gate of an injection mold according to claim 1, characterized in that, A lifting plate (7) is slidably arranged on the lower mold (3), and a plurality of ejector pins (71) are arranged on the lifting plate (7). A second spring (72) is arranged between the ejector pins (71) and the lower mold (3), and the two ends of the second spring (72) are fixedly connected to the ejector pins (71) and the lifting plate (7) respectively. A top column (13) is fixedly installed on the base (1), and the top column (13) is slidably connected to the lower mold (3).

6. The self-separation device for the injection mold gate according to claim 1, characterized in that, A drive motor (9) is fixedly installed on the top plate (11). A first screw (91) is fixedly installed on the motor shaft of the drive motor (9). A second screw (93) is fixedly installed on the first screw (91). A first connecting block (92) is threadedly connected to the first screw (91), and the first connecting block (92) is fixedly connected to the upper mold (2). A second connecting block (94) is threadedly connected to the second screw (93), and the second connecting block (94) is fixedly connected to the lower mold (3). The pitch of the first screw (91) is smaller than the pitch of the second screw (93).

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