An inclined top demolding mold and demolding process for a toilet lid

Abstract

The present invention relates to an inclined top demolding mold and a demolding process for a toilet lid, including a fixed mold and a movable mold. The movable mold includes a bottom plate, a first top plate disposed on the bottom plate, a second top plate disposed on the first top plate, two mold feet disposed on the bottom plate, a core plate disposed on the two mold feet. Two forming inserts and two stoppers are provided on the core plate. First sliding holes are respectively formed on both sides of the core plate along the mold opening direction. A ejector rod is slidably connected in each of the two first sliding holes. The top ends of the two ejector rods are respectively fixedly connected to the two stoppers, and the bottom ends are both fixedly connected to the second top plate. Two second sliding holes are formed on the core plate, and a first sliding rod is slidably connected in each of the two second sliding holes. The two first sliding rods are respectively connected to the two forming inserts. Two driving mechanisms for respectively driving the two first sliding rods to slide are further provided on the second top plate. The present invention not only ensures the smooth demolding of the lid body but also realizes the automatic cutting of the injection gate of the lid body.

Description

Technical Field

[0001] The present invention relates to the field of molds, and particularly to an inclined ejector die and an ejection process for a toilet lid. Background Art

[0002] There is a conventional toilet lid as Figure 1 shown, which includes a lid body 9. Two lugs 91 are provided at the rear end of the lid body 9, and two clamping posts 92 are provided at the front end. Since the opening directions of the two lugs 91 conflict with the ejection direction of the lid body 9, when the lid body 9 is ejected, the two forming inserts 3 for forming the two lugs 91 will form an undercut structure with the two lugs 91, thus affecting the smooth ejection of the lid body 9. Summary of the Invention

[0003] The present application provides an inclined ejector die for a toilet lid, which can ensure the formation of the two lugs while avoiding the forming inserts from affecting the ejection of the lid body.

[0004] The inclined ejector die for a toilet lid provided by the present application adopts the following technical solutions:

[0005] An inclined ejector die for a toilet lid includes a fixed die and a moving die. The moving die includes a bottom plate, a first top plate provided on the bottom plate, a second top plate provided on the first top plate, two die feet provided on the bottom plate, and a core plate provided on the two die feet. Two forming inserts for respectively forming the two lugs and two stoppers for respectively resisting against the opposite sides of the two lugs are provided on the core plate. The two forming inserts are located between the two stoppers. First sliding holes are respectively opened on both sides of the core plate along the mold opening direction. A ejector rod is slidably connected in each of the two first sliding holes. The top ends of the two ejector rods are respectively fixedly connected to the two stoppers, and the bottom ends are both fixedly connected to the second top plate. Two second sliding holes are opened on the core plate. The distance between the two second sliding holes gradually increases from the top ends of the two second sliding holes to the bottom ends of the two second sliding holes. First sliding rods are respectively slidably connected in the two second sliding holes along their respective lengths. The two first sliding rods are respectively connected to the two forming inserts. Two driving mechanisms for respectively driving the two first sliding rods to slide are further provided on the second top plate.

[0006] By adopting the above technical solution, after the mold is opened, the injection molding machine drives the first top plate and the second top plate to slide toward the fixed mold, and the synchronous driving mechanism drives the two first sliding rods to slide toward the fixed mold. When the first top plate and the second top plate slide, they will drive the two top rods and the two stoppers to slide toward the fixed mold, and when the two first sliding rods slide, they will drive the two molding inserts to slide toward the fixed mold, thereby ejecting the cover body from the core plate. During the sliding process of the two molding inserts and the two stoppers, the two molding inserts will gradually approach the two stoppers. Since the two stoppers are respectively supported on the opposite sides of the two lugs, during the sliding process of the two molding inserts, they will gradually slide out of the two lugs and finally completely detach from the two lugs, thereby releasing the undercut structure between the molding inserts and the lugs, so that the cover body can be demolded smoothly.

[0007] Preferably, the bottom of the fixed mold is provided with two pressing blocks for respectively pressing the two forming inserts.

[0008] By adopting the above technical solution, when the mold is closed, the two pressing blocks will respectively press the two forming pressing blocks so that the two forming inserts can be effectively prevented from failing to return to their proper positions.

[0009] Preferably, first sliding grooves are respectively provided on both sides of the second top plate perpendicular to the mold opening direction, and the two driving mechanisms include two sliding blocks respectively slidably connected in the two first sliding grooves, and four limit blocks respectively arranged on both sides of the two sliding blocks, and limit grooves are provided on both side walls of the two first sliding grooves along the direction perpendicular to the mold opening direction of the mold, and the four limit blocks are respectively slidably connected in the four limit grooves.

[0010] By adopting the above technical solution, after the mold is opened, the injection molding machine will drive the first top plate and the second top plate to slide toward the upper mold plate. When the second top plate slides, the two sliders will push the two first slide bars to slide respectively. During the sliding process of the first slide bars, the two sliders will also approach each other, so that the first slide bars can slide smoothly in the first slide holes. Therefore, by setting the two sliders, the direction of the force is transformed, so that the two first slide bars can slide smoothly.

[0011] Preferably, two guide rods are fixedly connected to both sides of the bottom of the core plate, the axes of the two guide rods are parallel to the axes of the two first sliding rods, the two sliding blocks are respectively provided with a third sliding hole, the first top plate is provided with two through grooves, the two through grooves are respectively connected to the two first sliding grooves, and the bottom ends of the two guide rods are respectively provided with two third sliding holes and two through grooves and fixedly connected to the bottom plate.

[0012] By adopting the above technical solution, two guide rods are provided to assist in guiding the sliding of the two sliders, so that the sliding of the sliders is smoother.

[0013] Preferably, a receiving cavity is formed on one side of the forming insert away from the adjacent stopper. A first rack is slidably connected in the receiving cavity along a direction perpendicular to the mold opening direction. A second rack is slidably connected to the upper edge of the first rack along the length direction of the first rack. A first rotating shaft is rotatably connected to the second rack. A cutter for cutting the injection gate of the cover body and a torsion spring are provided on the first rotating shaft. The torsion spring is used to drive the first rotating shaft to rotate, thereby driving the cutter to rotate towards the center of the mold. A second rotating shaft is also rotatably provided in the receiving cavity. A first gear meshing with the first rack and a second gear meshing with the second rack are provided on the second rotating shaft. A control assembly for controlling the sliding of the first rack is further provided in the cavity.

[0014] By adopting the above technical solution, during the process of the forming insert sliding away from the lug, the control assembly drives the first rack to slide. During the sliding process of the first rack, it will drive the first gear to rotate. The rotation of the first gear will drive the first rotating shaft to rotate. The rotation of the first rotating shaft will drive the second gear to rotate. When the second gear rotates, it will drive the second rack to slide away from the first rack. During the sliding process of the second rack, the cutter will gradually extend out of the receiving cavity. During this period, without the obstruction of the side wall of the receiving cavity, the cutter will rotate towards the cover body under the action of the torsion spring. Finally, during the displacement of the forming insert, the cutter will collide with the gate of the cover body and cut off the gate, completing the automatic cutting of the cover body gate.

[0015] Preferably, the control assembly includes a third rotating shaft rotatably connected in the receiving cavity, a third gear provided on the third rotating shaft, a third rack provided on one side of the first rack, and a fourth rack slidably connected in the receiving cavity along a direction perpendicular to the mold opening direction. The third rack and the fourth rack are respectively located on both sides of the third gear and respectively mesh with the third gear. One end of the fourth rack close to the stopper is fixedly connected to the stopper.

[0016] By adopting the above technical solution, when the forming insert moves away from the stopper, the fourth rack will slide relative to the forming insert, thereby driving the third gear to rotate. The rotation of the third gear will drive the third rack and the first rack to slide, so that the gate cutter slides out of the forming insert.

[0017] The present application also provides a demolding process, adopting the following technical solution: applying an inclined ejector demolding mold for a toilet cover, including the following steps;

[0018] S1: The fixed mold and the moving mold are closed for cover body injection molding;

[0019] S2: The injection molding machine controls the separation of the fixed mold and the moving mold;

[0020] S3: The injection molding machine controls the first top plate and the second top plate to slide toward the moving mold side, so that the two ejector pins, the two ejector rods and the two forming inserts slide toward the fixed mold to eject the cover body from the core plate. During the sliding process of the two forming inserts, they will move away from the two stoppers respectively and gradually disengage from the two lugs; when the forming insert moves away from the stopper, the cutter extends out of the accommodating cavity and its cutting edge faces the gate of the cover body;

[0021] S4: During the displacement process of the forming insert, the cutter cuts off the gate of the cover body;

[0022] S5: The first top plate and the second top plate are displaced to the designated positions, and the two forming inserts are completely disengaged from the two lugs, and the cover body is successfully demolded.

[0023] By adopting the above technical solution, the successful demolding of the cover body is realized.

[0024] The technical effects of the present invention are mainly reflected in the following aspects:

[0025] 1. The present invention provides stoppers to assist the forming inserts to disengage from the lugs;

[0026] 2. The present invention utilizes the relative movement between the forming insert and the stopper to prompt the gate cutter to slide out of the forming insert and automatically cut off the gate on the cover body;

[0027] 3. The present invention can effectively prevent the forming insert from not retracting in place by providing a pressing block. Description of the Drawings

[0028] Figure 1 It is a schematic structural view of a toilet cover.

[0029] Figure 2 It is a schematic structural view of the mold in this embodiment.

[0030] Figure 3 It is Figure 2 The schematic structural view of the fixed mold in

[0031] Figure 4 It is Figure 2 The schematic structural view of the moving mold in

[0032] Figure 5 It is Figure 4 The partial cross-sectional view along the A-A line in

[0033] Figure 6 It is Figure 4 The partial cross-sectional view along the B-B line in

[0034] Figure 7 It is Figure 2 The schematic structural view of the core plate in the top view state in

[0035] Figure 8It is a schematic structural diagram of the second embodiment of the present application.

[0036] Reference numerals: 1, fixed mold; 2, moving mold; 21, bottom plate; 22, first top plate; 221, through groove; 23, second top plate; 231, first sliding groove; 232, limiting groove; 24, mold feet; 25, core plate; 251, first sliding hole; 252, second sliding hole; 3, forming insert; 31, accommodating cavity; 4, driving mechanism; 41, slider; 411, third sliding hole; 42, limiting block; 51, first sliding rod; 52, stopper; 53, ejector rod; 54, guiding rod; 55, ejector pin; 61, first rack; 62, second rack; 63, first rotating shaft; 64, cutter; 65, coil spring; 66, second rotating shaft; 67, first gear; 68, second gear; 7, control component; 71, third rotating shaft; 72, third gear; 73, third rack; 74, fourth rack; 8, pressing block; 9, cover body; 91, lug; 92, clamping post. Detailed implementation manners

[0037] The following further describes the present application in detail with reference to the drawings, so that the technical solutions of the present application are easier to understand and master. Embodiment

[0038] An inclined ejector demolding mold for a toilet cover in this embodiment includes a fixed mold 1 and a moving mold 2. The moving mold 2 includes a bottom plate 21, a first top plate 22 arranged on the bottom plate 21, a second top plate 23 fixed to the first top plate 22 by bolts, two mold feet 24 fixed to the bottom plate 21, and a core plate 25 fixed to the two mold feet 24. The first top plate 22 and the second top plate 23 are located between the two mold feet 24. Four guiding columns are fixedly connected between the bottom plate 21 and the core plate 25. The first top plate 22 and the second top plate 23 are slidably connected to the four guiding columns along the mold opening direction. Two ejector pins 55 for forming two clamping posts 92 are also fixed on the second top plate 23. The ejector post on the injection molding machine penetrates the bottom plate 21 and is fixedly connected to the first top plate 22 by bolts.

[0039] Two forming inserts 3 for respectively forming two lugs 91 and two stoppers 52 for respectively resisting against the opposite sides of the two lugs 91 are movably connected to the core plate 25. The two forming inserts 3 are located between the two stoppers 52. When the mold is closed, the two forming inserts 3 are respectively in contact with the two stoppers 52. After the cover body 9 is injection molded, the opposite sides of the two lugs 91 are respectively in contact with the opposite sides of the two stoppers 52 that are away from each other. First sliding holes 251 are respectively opened on both sides of the core plate 25 along the mold opening direction. Two ejector rods 53 are slidably connected in the two first sliding holes 251. The tops of the two ejector rods 53 are respectively fixedly connected to the two stoppers 52, and the bottoms are both fixedly connected to the second top plate 23. Two pressing blocks 8 for respectively pressing the two forming inserts 3 are fixedly connected to the bottom of the fixed mold 1.

[0040] On both sides of the top surface of the second top plate 23, first sliding grooves 231 are respectively formed perpendicular to the mold opening direction of the mold, and both of the two first sliding grooves 231 penetrate through the second top plate 23. The second top plate 23 is further provided with two driving mechanisms 4 for respectively driving the two first sliding rods 51 to slide. The two driving mechanisms 4 include two sliders 41 respectively slidingly connected in the two first sliding grooves 231 along the direction perpendicular to the mold opening direction of the mold, and four limiting blocks 42 respectively fixedly connected to both sides of the two sliders 41. On both side walls of the two first sliding grooves 231, limiting grooves 232 are respectively formed along the direction perpendicular to the mold opening direction of the mold, and the four limiting blocks 42 are respectively slidingly connected in the four limiting grooves 232.

[0041] On both sides of the bottom of the core plate 25, two guiding rods 54 are respectively fixedly connected. The axes of the two guiding rods 54 are respectively parallel to the axes of the two first sliding rods 51. Third sliding holes 411 are respectively formed in the two sliders 41. Two through grooves 221 are formed in the first top plate 22 along the direction. The two through grooves 221 respectively communicate with the two first sliding grooves 231. The bottom ends of the two guiding rods 54 respectively pass through the two third sliding holes 411 and the two through grooves 221 and are fixedly connected to the bottom plate 21.

[0042] Embodiment 2: On the basis of Embodiment 1, the following structural features are added.

[0043] On one side of one of the forming inserts 3 away from the adjacent stop block 52, a receiving cavity 31 is formed along the direction perpendicular to the mold opening direction of the mold. A first rack 61 is slidingly connected in the receiving cavity 31 along the direction perpendicular to the mold opening direction of the mold. A sliding groove is formed on the upper edge of the first rack 61 along the length direction of the first rack 61. A second rack 62 is slidingly connected in the sliding groove. A first rotating shaft 63 is rotatably connected to the second rack 62. A cutter 64 for cutting the injection gate of the cover body 9 is fixedly connected to the top of the first rotating shaft 63. A torsion spring 65 is fixedly connected to the first rotating shaft 63. The torsion spring 65 is sleeved outside the first rotating shaft 63 and is used to drive the first rotating shaft 63 to rotate so as to drive the cutter 64 to rotate towards the center side of the mold. The axis of the first rotating shaft 63 is parallel to the mold opening direction. In the initial state, the cutter 64 will abut against the side wall of the receiving cavity 31. A second rotating shaft 66 is also rotatably provided in the receiving cavity 31. The second rotating shaft 66 is located above the first rack 61. The axis of the second rotating shaft 66 is perpendicular to the mold opening direction of the mold and also perpendicular to the length direction of the first rack 61. A first gear 67 meshing with the first rack 61 and a second gear 68 meshing with the second rack 62 are coaxially fixed to the second rotating shaft 66. The second gear 68 is located between the movement track of the cutter 64 and the first gear 67. The diameter of the second gear 68 is larger than the diameter of the first gear 67. The first rotating shaft 63 is located below the cutter 64.

[0044] A control assembly 7 for driving the first rack 61 to slide is also provided in the cavity. The control assembly 7 includes a third rotating shaft 71 rotatably connected to the accommodating cavity 31, a third gear 72 coaxially fixedly connected to the third rotating shaft 71, a third rack 73 fixedly connected to the first rack 61 on the side away from the center of the core plate 25, and a fourth rack 74 slidably connected to the accommodating cavity 31 along a direction perpendicular to the mold opening direction. The axis of the third rotating shaft 71 is parallel to the axis of the second rotating shaft 66. The third rack 73 and the fourth rack 74 are respectively located on both sides of the third gear 72 and mesh with the third gear 72 respectively. One end of the fourth rack 74 close to the stopper 52 is fixedly connected to the stopper 52.

[0045] The demoulding process of the mold of the present invention is as follows:

[0046] When the mold is closed, the fixed mold 1 and the movable mold 2 are closed, and the two pressing blocks 8 are pressed against the two molding inserts 3 respectively to ensure that the molding inserts 3 are retracted into place. Then the main machine starts to inject plastic into the mold to form the cover body 9. After the cover body 9 is formed, the two lugs 91 face each other and contact with the two stoppers 52 away from each other, and the two inserts are located between the two lugs 91.

[0047] Then the mold is opened, the injection molding machine drives the movable mold 2 away from the fixed mold 1, and then the first top plate 22 and the second top plate 23 of the injection molding machine slide toward the fixed mold 1. When the second top plate 23 slides, it drives the two ejector pins 55, the two ejector rods 53 and the two molding inserts 3 to slide toward the fixed mold 1, thereby ejecting the cover 9 from the core plate 25. During the sliding process of the two molding inserts 3 and the two stoppers 52, the two molding inserts 3 will gradually approach the two stoppers 52. Since the two stoppers 52 are respectively abutted on the opposite sides of the two lugs 91, the two molding inserts 3 will gradually slide out from the two lugs 91 during the sliding process.

[0048] When the molding insert 3 is away from the stopper 52, the fourth rack 74 will slide relative to the molding insert 3, thereby driving the third gear 72 to rotate. The rotation of the third gear 72 will drive the third rack 73 and the first rack 61 to slide out of the accommodating cavity 31. During the sliding process of the first rack 61, the first gear 67 will be driven to rotate. The rotation of the first gear 67 will drive the first rotating shaft 63 to rotate. The rotation of the first rotating shaft 63 will drive the second gear 68 to rotate. When the second gear 68 rotates, it will drive the second rack 62 to slide away from the first rack 61. During the sliding process of the second rack 62, the cutter 64 will gradually extend out of the accommodating cavity 31 and move toward the gate of the cover body 9. During this period, without the obstruction of the side wall of the accommodating cavity 31, the cutter 64 will rotate toward the side of the cover body 9 under the action of the coil spring 65, so that the blade of the cutter 64 faces the gate of the cover body 9. Finally, during the movement of the molding insert 3, the cutter 64 will collide with the gate of the cover body 9 and cut off the gate, thereby completing the automatic cutting of the gate of the cover body 9.

[0049] Finally, the two formed inserts 3 will completely separate from the two lugs 91, so that the reverse buckling structure between the formed insert 3 and the lug 91 is released, and the cover body 9 can be smoothly demolded.

[0050] Of course, the above are only typical examples of this application. In addition, this application can also have many other specific implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by this application.

Claims

1. A toilet lid inclined top demolding mold, comprising a fixed mold and a movable mold. The movable mold includes a bottom plate, a first top plate disposed on the bottom plate, a second top plate disposed on the first top plate, two mold feet disposed on the bottom plate, and a core plate disposed on the two mold feet, characterized in that: The core plate is provided with two forming inserts for respectively forming two lugs and two stoppers for respectively resisting against the opposite sides of the two lugs. The two forming inserts are located between the two stoppers. On both sides of the core plate, first sliding holes are respectively opened along the mold opening direction of the mold. In both of the two first sliding holes, ejector rods are slidably connected. The top ends of the two ejector rods are respectively fixedly connected to the two stoppers, and the bottom ends are both fixedly connected to the second top plate. Two second sliding holes are opened on the core plate. The distance between the two second sliding holes gradually increases from the top ends of the two second sliding holes to the bottom ends of the two second sliding holes. In the two second sliding holes, first sliding rods are respectively slidably connected along their respective length directions. The two first sliding rods are respectively connected to the two forming inserts. On the second top plate, two driving mechanisms are further provided for respectively driving the two first sliding rods to slide; on one side of a forming insert away from the adjacent stopper, a receiving cavity is opened. In the receiving cavity, a first rack is slidably connected along a direction perpendicular to the mold opening direction. On the first rack, a second rack is slidably connected along the length direction of the first rack. A first rotating shaft is rotatably connected to the second rack. On the first rotating shaft, a cutter for cutting the injection gate of the cover body and a torsion spring are provided. The torsion spring is used for driving the first rotating shaft to rotate so as to drive the cutter to rotate towards the center side of the mold. In the receiving cavity, a second rotating shaft is further rotatably provided. On the second rotating shaft, a first gear meshing with the first rack and a second gear meshing with the second rack are provided. In the cavity, a control component for controlling the sliding of the first rack is further provided; the control component includes a third rotating shaft rotatably connected in the receiving cavity, a third gear provided on the third rotating shaft, a third rack provided on one side of the first rack, and a fourth rack slidably connected in the receiving cavity along a direction perpendicular to the mold opening direction. The third rack and the fourth rack are respectively located on both sides of the third gear and respectively mesh with the third gear. One end of the fourth rack close to the stopper is fixedly connected to the stopper.

2. A toilet lid inclined ejection mold according to claim 1, characterized in that: At the bottom of the fixed mold, two pressing blocks for respectively pressing the two forming inserts are provided.

3. A toilet lid inclined ejection mold according to claim 1, characterized in that: On both sides of the second top plate, first sliding grooves are respectively opened along a direction perpendicular to the mold opening direction. The two driving mechanisms include two sliders respectively slidably connected in the two first sliding grooves and four limiting blocks respectively provided on both sides of the two sliders. On the side walls of both sides of the two first sliding grooves, limiting grooves are respectively opened along a direction perpendicular to the mold opening direction. The four limiting blocks are respectively slidably connected in the four limiting grooves.

4. A toilet lid inclined ejection mold according to claim 2, characterized in that: On both sides of the bottom of the core plate, two guiding rods are respectively fixedly connected. The axes of the two guiding rods are respectively parallel to the axes of the two first sliding rods. Third sliding holes are respectively opened on the two sliders. On the first top plate, two through grooves are opened. The two through grooves respectively communicate with the two first sliding grooves. The bottom ends of the two guiding rods respectively pass through the two third sliding holes and the two through grooves and are fixedly connected to the bottom plate.

5. A demolding process, characterized in that: Applying the toilet cover inclined ejection mold according to any one of claims 1-4, includes the following steps; S1: The fixed mold and the moving mold are closed for injection molding of the cover body; S2: The injection molding machine controls the separation of the fixed mold and the moving mold; S3: The injection molding machine controls the first top plate and the second top plate to slide toward the moving mold side, so that the two ejector pins, the two ejector rods and the two forming inserts slide toward the fixed mold to eject the cover body from the core plate. During the sliding process of the two forming inserts, they will respectively move away from the two stoppers and gradually disengage from the two lugs; when the forming inserts move away from the stoppers, the cutter extends out of the receiving cavity and its blade faces the gate of the cover body; S4: During the displacement process of the forming inserts, the cutter cuts off the gate of the cover body; S5: The first top plate and the second top plate are displaced to the designated positions, the two forming inserts are completely disengaged from the two lugs, and the cover body is successfully demolded.

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