Elastic needle back-off demolding mechanism of plastic turnover box mold

Abstract

The utility model belongs to the technical field of molds, and particularly relates to an elastic needle back-off demolding mechanism of a plastic turnover box mold. The turnover box forming die comprises a turnover box forming lower die and a turnover box forming upper die, and a turnover box forming convex seat is arranged on the turnover box forming lower die. In the injection molding process, molten materials are injected into the mold cavity through the injection molding flow dividing piece, the mold is opened after injection molding is completed, and the turnover box forming convex base is drawn out from the space between the turnover box forming concave cavity and the turnover box side end wall forming inverted buckle demolding assembly in an inverted buckle mode; then, the turnover box side end wall forming inverted buckle demolding assembly is moved to the end away from the turnover box forming upper mold, the formed turnover box plastic part is subjected to inverted buckle demolding along the peripheral side walls, the turnover box plastic part can be stably demolded from top to bottom, an ejector rod structure does not need to be adopted, the internal structure of the mold is greatly simplified, and the mold cost is reduced. A point ejection form is replaced by a surface demolding form, so that the surface of the plastic part is prevented from being sunken, and the surface quality of the plastic part is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to a spring-pin inverted demoulding mechanism of a plastic turnover box mold. Background Art

[0002] Plastic turnover boxes can be widely used to transport foods such as fruits and vegetables, as well as to store auto parts and industrial components. They bring convenience to transportation and storage, so they are widely used. The structure of the turnover box mainly includes the surrounding box walls and the bottom box bottom. At present, plastic turnover boxes are injection molded using injection molds. In order to make it more convenient to put things in, the opening shape of the plastic turnover box generally gradually increases from bottom to top. After injection molding, when the ejector rod is used for ejection and demoulding, on the one hand, it will cause jamming between the template, and on the other hand, the ejector rod is a point ejection type, which is easy to cause dents on the surface of the plastic part, affecting the surface quality of the plastic part. At the same time, the structure inside the mold is complicated. Therefore, it is urgent to design a pin-type inverted demoulding mechanism for the plastic turnover box mold that can overcome the above defects.

[0003] In order to overcome the shortcomings of the existing technology, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses a demoulding mechanism for a plastic turnover box mold [application number: 200910152491.0], which includes a mold cavity composed of a fixed mold core, a movable mold insert and a large slider. The mold cavity contains a turnover box, and the turnover box has a handle hole demoulding mechanism, a snap demoulding mechanism and an ejection mechanism. The handle hole demoulding mechanism includes a reset rod installed in the slider pad, one end of the reset rod is connected to the handle hole slider, the handle hole slider passes through the large slider and cooperates with the handle hole, and the other end is connected to the reset rod bundle block. A reset spring is installed between the reset rod bundle block and the slider pad, and cooperates with the movable mold bevel block; the clip demoulding mechanism includes a lower clip and a side clip demoulding mechanism, the lower clip demoulding mechanism includes a lower clip oblique slider that cooperates with the lower clip, connecting the lower clip guide rod and the clip bundle block, and a clip spring is installed between the clip bundle block and the large slider; the side clip demoulding mechanism includes a side oblique slider that cooperates with the side clip of the turnover box, and connects the side guide rod and the clip bundle block; the ejection mechanism includes an ejection cylinder diagonally installed in the movable mold plate, the ejection cylinder drives the push plate, the push plate is installed with an ejection block, and the ejection block is in contact with the edge of the turnover box. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and provide a spring-pin undercut demoulding mechanism for a plastic turnover box mold.

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

[0006] A spring-pin inverted demolding mechanism for a plastic turnover box mold comprises a turnover box molding lower mold and a turnover box molding upper mold, the turnover box molding lower mold is provided with a turnover box molding boss, the turnover box molding upper mold is provided with a turnover box molding cavity, the turnover box molding boss corresponds to the position of the turnover box molding cavity and is matched in shape, a boss limiter is provided between the turnover box molding lower mold and the turnover box molding upper mold, the turnover box molding boss passes through the boss limiter, a turnover box side end wall molding inverted demolding assembly is provided in the turnover box molding cavity, the turnover box side end wall molding inverted demolding assembly is matched in shape with the turnover box molding boss, and an injection molding diverter is provided above the turnover box molding upper mold.

[0007] In the above-mentioned elastic pin flip-down demolding mechanism of the plastic turnover box mold, the turnover box side end wall molding flip-down demolding assembly includes two side wall molding slides and two end wall molding slides arranged in the turnover box molding cavity, and the two side wall molding slides and the two end wall molding slides enclose a side end wall molding chamber that passes through from top to bottom.

[0008] In the above-mentioned elastic pin inverted demolding mechanism of the plastic turnover box mold, the inner side of the side wall molding slide has a turnover box side groove molding protrusion, and the turnover box side groove molding protrusion corresponds to the side position of the turnover box molding boss.

[0009] In the above-mentioned elastic pin inverted demolding mechanism of the plastic turnover box mold, the inner side of the end wall molding slide is provided with a turnover box end protrusion molding groove, and the two ends of the turnover box molding boss are provided with turnover box end molding protrusions, and the turnover box end protrusion molding groove corresponds to the position of the turnover box end molding protrusion and the shape is matched.

[0010] In the above-mentioned elastic pin inverted demoulding mechanism of the plastic turnover box mold, the protruding molding groove at the end of the turnover box opens downward, and the width of the protruding molding groove at the end of the turnover box gradually increases from top to bottom.

[0011] In the above-mentioned elastic needle inverted demoulding mechanism of the plastic turnover box mold, a slide limiting elastic needle part is provided in the turnover box molding upper mold, and the side wall molding slide and the end wall molding slide are respectively slidably matched with the slide limiting elastic needle part.

[0012] In the above-mentioned elastic needle inverted demolding mechanism of the plastic turnover box mold, the slide limiting elastic needle part includes a plurality of slide limiting elastic needle strips arranged in the turnover box forming upper mold, and the slide limiting elastic needle strips are fixed to the turnover box forming upper mold by a plurality of bolts.

[0013] In the above-mentioned elastic needle inverted demoulding mechanism of the plastic turnover box mold, the side wall forming slide and the end wall forming slide are respectively slidably matched with the slide limiting elastic needle strips, and the slide limiting elastic needle strips are arranged at an angle.

[0014] In the above-mentioned elastic pin inverted demoulding mechanism of the plastic turnover box mold, the top of the turnover box forming protrusion is provided with a plurality of mutually parallel turnover box bottom surface groove forming convex strips.

[0015] In the above-mentioned elastic needle inverted demoulding mechanism of the plastic turnover box mold, the injection molding diverter includes an injection molding main board and an injection molding diverter plate arranged above the turnover box molding upper mold.

[0016] Compared with the existing technology, the advantages of this utility model are:

[0017] 1. In the injection molding process, the utility model brings the turnover box molding lower mold and the turnover box molding upper mold close to each other, so that the turnover box molding convex seat fits with the turnover box molding cavity, the turnover box molding convex seat, the turnover box molding cavity and the turnover box side end wall molding undercut demoulding assembly cooperate with each other to form a complete cavity, the convex seat limiter is used to limit the turnover box molding convex seat, the molten material is injected into the cavity through the injection molding diverter, and the mold is opened after the injection molding is completed, and the turnover box molding convex seat is removed from the turnover box molding cavity. The cavity and the side end wall molding undercut demoulding component of the turnover box are first undercut and pulled out, and then the side end wall molding undercut demoulding component of the turnover box is moved to the end away from the turnover box molding upper mold, and the molded turnover box plastic part is undercut and demoulded along the four side walls. The turnover box plastic part can be demoulded smoothly from top to bottom without the need for a push rod structure, which greatly simplifies the internal structure of the mold. The surface demoulding form is used instead of the point ejection form, which avoids dents on the surface of the plastic part and improves the surface quality of the plastic part.

[0018] 2. When the utility model is demoulded by inverted buckling after the injection molding is completed, the raised molding groove at the end of the turnover box opens downward, and the width of the raised molding groove at the end of the turnover box gradually increases from top to bottom, which can better demould the turnover box plastic parts by inverted buckling without getting stuck.

[0019] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the present utility model.

[0021] Figure 2 It is a partial structural diagram of the utility model.

[0022] Figure 3 It is a partial structural diagram of the utility model in another direction.

[0023] Figure 4 It is a partial structural diagram of the utility model in another direction.

[0024] Figure 5 It is a structural diagram of the upper die for forming a turnover box.

[0025] Figure 6 It is a schematic diagram of the local structure in another direction.

[0026] In the figure: turnover box molding lower mold 1, turnover box molding upper mold 2, turnover box molding protrusion 3, turnover box molding cavity 4, protrusion limiter 5, turnover box side end wall molding undercut demoulding component 6, injection molding diverter 7, side wall molding slide 8, end wall molding slide 9, turnover box side groove molding protrusion 10, turnover box end protrusion molding groove 11, turnover box end molding protrusion 12, slide limit elastic needle part 13, slide limit elastic needle strip 14, turnover box bottom groove molding protrusion 15, injection molding main board 16, injection molding diverter plate 17. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] like Figure 1-6 As shown, a spring-pin inverted demolding mechanism of a plastic turnover box mold includes a turnover box molding lower mold 1 and a turnover box molding upper mold 2. The turnover box molding lower mold 1 is provided with a turnover box molding protrusion 3, and the turnover box molding upper mold 2 is provided with a turnover box molding cavity 4. The turnover box molding protrusion 3 corresponds to the position of the turnover box molding cavity 4 and the shape is matched. A protrusion limiter 5 is provided between the turnover box molding lower mold 1 and the turnover box molding upper mold 2. The turnover box molding protrusion 3 passes through the protrusion limiter 5. A turnover box side end wall molding inverted demolding component 6 is provided in the turnover box molding cavity 4. The turnover box side end wall molding inverted demolding component 6 is matched with the shape of the turnover box molding protrusion 3. An injection molding diverter 7 is provided above the turnover box molding upper mold 2.

[0029] In this embodiment, during the injection molding process, the turnover box molding lower mold 1 and the turnover box molding upper mold 2 are brought close to each other, so that the turnover box molding protrusion 3 is fitted with the turnover box molding cavity 4, the turnover box molding protrusion 3, the turnover box molding cavity 4 and the turnover box side end wall molding undercut demoulding component 6 cooperate with each other to form a complete cavity, the protrusion limiter 5 is used to limit the turnover box molding protrusion 3, the molten material is injected into the cavity through the injection molding diverter 7, and the mold is opened after the injection molding is completed, and the turnover box molding protrusion 3 is removed from the mold. The turnover box molding cavity 4 and the turnover box side end wall molding inverted demoulding component 6 are first inverted and pulled out, and then the turnover box side end wall molding inverted demoulding component 6 is moved to the end away from the turnover box molding upper mold 2, and the molded turnover box plastic part is inverted and demoulded along the four side walls. The turnover box plastic part can be demoulded smoothly from top to bottom without the need for a push rod structure, which greatly simplifies the internal structure of the mold, and uses surface demoulding instead of point ejection to avoid causing depression on the surface of the plastic part and improve the surface quality of the plastic part.

[0030] Combine Figure 1-6 As shown, the turnover box side end wall forming undercut demolding assembly 6 includes two side wall forming slides 8 and two end wall forming slides 9 arranged in the turnover box forming cavity 4. The two side wall forming slides 8 and the two end wall forming slides 9 enclose a side end wall forming chamber that passes through from top to bottom.

[0031] Specifically, during the injection molding process, the turnover box molding protrusion 3, the turnover box molding cavity 4, the two side wall molding slides 8 and the two end wall molding slides 9 cooperate with each other to form a complete cavity. After the injection molding is completed, the mold is opened, and the turnover box molding protrusion 3 is first inverted and pulled out from between the turnover box molding cavity 4 and the two side wall molding slides 8 and the two end wall molding slides 9, and then the two side wall molding slides 8 and the two end wall molding slides 9 are moved away from the end of the turnover box molding upper mold 2, and the molded turnover box plastic part is inverted and demolded along the four side walls. The turnover box plastic part can be demolded smoothly from top to bottom without the need for a push rod structure, which greatly simplifies the internal structure of the mold. The surface demolding form is used instead of the point ejection form to avoid causing depressions on the surface of the plastic part and improve the surface quality of the plastic part.

[0032] The inner side of the side wall forming slide 8 is provided with a turnover box side groove forming protrusion 10 , and the turnover box side groove forming protrusion 10 corresponds to the side position of the turnover box forming boss 3 .

[0033] In this embodiment, during injection molding, the turnover box side groove molding protrusion 10 is used to simultaneously mold the turnover box side groove structure, and no secondary processing is required.

[0034] Combine Figure 4 、 Figure 6 As shown, the inner side of the end wall forming slide 9 has a turnover box end protrusion forming groove 11, and the two ends of the turnover box forming boss 3 are provided with turnover box end forming protrusions 12, and the turnover box end protrusion forming groove 11 corresponds to the position of the turnover box end forming protrusion 12 and the shape is matched.

[0035] In this embodiment, during the injection molding process, the convex molding groove 11 at the end of the turnover box cooperates with the convex molding 12 at the end of the turnover box to form the convex structure at the end of the turnover box, and no secondary processing is required.

[0036] The protruding groove 11 at the end of the turnover box opens downward, and the width of the protruding groove 11 at the end of the turnover box gradually increases from top to bottom.

[0037] In this embodiment, when the turnover box is demolded by inverted molding after the injection molding is completed, the raised molding groove 11 at the end of the turnover box opens downward, and the width of the raised molding groove 11 at the end of the turnover box gradually increases from top to bottom, which can better demold the turnover box plastic parts by inverted molding without getting stuck.

[0038] Combine Figure 3 As shown, a slide limiting elastic needle member 13 is provided in the turnover box forming upper die 2, and the side wall forming slide 8 and the end wall forming slide 9 are slidably matched with the slide limiting elastic needle member 13 respectively.

[0039] In this embodiment, when the side wall forming slide 8 and the end wall forming slide 9 are moved for inverted demoulding, the slide limiting spring pin 13 limits the side wall forming slide 8 and the end wall forming slide 9 to ensure the angle and position of demoulding.

[0040] The slide limiting elastic needle member 13 includes a plurality of slide limiting elastic needle strips 14 arranged in the turnover box forming upper mold 2, and the slide limiting elastic needle strips 14 are fixed to the turnover box forming upper mold 2 by a plurality of bolts.

[0041] In this embodiment, when the side wall forming slide 8 and the end wall forming slide 9 are moved for inverted demoulding, the slide limit spring pin strip 14 limits the side wall forming slide 8 and the end wall forming slide 9 to ensure the angle and position of demoulding.

[0042] Combine Figure 1-6 As shown, the side wall forming slide 8 and the end wall forming slide 9 are respectively slidably matched with the slide limiting elastic needle strip 14, and the slide limiting elastic needle strip 14 is set at an angle.

[0043] In this embodiment, the slide limiting elastic needle strip 14 is arranged at an angle to limit the sliding angles of the side wall forming slide 8 and the end wall forming slide 9 .

[0044] Combine Figure 1-6 As shown, the top of the turnover box forming protrusion 3 has a plurality of turnover box bottom surface groove forming ridges 15 parallel to each other.

[0045] In this embodiment, the groove forming ridges 15 on the bottom surface of the turnover box are used to simultaneously form the groove structure on the bottom surface of the turnover box.

[0046] Combine Figure 1-6 As shown, the injection molding diverter 7 includes an injection molding main plate 16 and an injection molding diverter plate 17 which are arranged above the turnover box molding upper mold 2.

[0047] In this embodiment, during the injection molding process, the molten material is injected through the injection molding main plate 16 and then diverted through the injection molding diverter plate 17 .

[0048] The working principle of this utility model is:

[0049] After the moulding is complete, the cam 3 is pulled out from between the moulding cavity 4 and the two side wall moulding slides 8 and the two end wall moulding slides 9. Then the two side wall moulding slides 8 and the two end wall moulding slides 9 are moved away from the upper mould 2 of the turnover box. The formed plastic part of the turnover box is demoulded along the four side walls. The plastic part of the turnover box can be demoulded smoothly from top to bottom without the need for a push rod structure. The internal structure of the mould is greatly simplified. The surface demoulding is replaced by the point ejection form to avoid depression on the surface of the plastic part and improve the surface quality of the plastic part.

[0050] During injection molding, the groove forming protrusion 10 on the side of the turnover box is used to simultaneously form the groove structure on the side of the turnover box, without the need for secondary processing.

[0051] During the injection molding process, the convex molding groove 11 at the end of the turnover box cooperates with the convex molding 12 at the end of the turnover box to form the convex structure at the end of the turnover box, without the need for secondary processing.

[0052] When the inverted mold is released after the injection molding is completed, the raised molding groove 11 at the end of the turnover box opens downward, and the width of the raised molding groove 11 at the end of the turnover box gradually increases from top to bottom, which can better release the turnover box plastic parts by inverting without getting stuck.

[0053] When the side wall forming slide 8 and the end wall forming slide 9 are moved for demoulding, the slide limit spring pin 13 limits the side wall forming slide 8 and the end wall forming slide 9 to ensure the angle and position of demoulding.

[0054] When the side wall forming slide 8 and the end wall forming slide 9 are moved for demoulding, the slide limit spring pin strip 14 limits the side wall forming slide 8 and the end wall forming slide 9 to ensure the angle and position of demoulding.

[0055] The slide limit spring pin strip 14 is tilted to limit the sliding angle of the side wall forming slide 8 and the end wall forming slide 9.

[0056] The groove forming ridges 15 on the bottom surface of the turnover box are used to synchronously form the groove structure on the bottom surface of the turnover box.

[0057] During the injection molding process, the molten material is injected through the injection molding main plate 16 and then diverted through the injection molding diverter plate 17 .

[0058] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods, without departing from the spirit of the present invention.

[0059] Although this article frequently uses terms such as turnover box molding lower mold 1, turnover box molding upper mold 2, turnover box molding protrusion 3, turnover box molding cavity 4, protrusion stopper 5, turnover box side end wall molding undercut demoulding assembly 6, injection molding diverter 7, side wall molding slide 8, end wall molding slide 9, turnover box side groove molding protrusion 10, turnover box end protrusion molding groove 11, turnover box end molding protrusion 12, slide stopper elastic needle 13, slide stopper elastic needle strip 14, turnover box bottom surface groove molding protrusion 15, injection molding main board 16, injection molding diverter plate 17, etc., it does not exclude the possibility of using other terms. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the utility model. Interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A pin-type undercut demoulding mechanism for a plastic turnover box mold, comprising a turnover box molding lower mold (1) and a turnover box molding upper mold (2), characterized in that: The turnover box molding lower mold (1) is provided with a turnover box molding protrusion (3), and the turnover box molding upper mold (2) is provided with a turnover box molding cavity (4). The positions of the turnover box molding protrusion (3) and the turnover box molding cavity (4) correspond and the shapes are matched. A protrusion stopper (5) is provided between the turnover box molding lower mold (1) and the turnover box molding upper mold (2). The turnover box molding protrusion (3) passes through the protrusion stopper (5). A turnover box side end wall molding undercut demoulding component (6) is provided in the turnover box molding cavity (4). The turnover box side end wall molding undercut demoulding component (6) is matched with the shape of the turnover box molding protrusion (3). An injection molding diverter (7) is provided above the turnover box molding upper mold (2).

2. The elastic pin undercut demoulding mechanism of the plastic turnover box mold according to claim 1 is characterized in that: The turnover box side end wall forming undercut demoulding assembly (6) comprises two side wall forming slides (8) and two end wall forming slides (9) arranged in the turnover box forming cavity (4); the two side wall forming slides (8) and the two end wall forming slides (9) enclose a side end wall forming chamber that passes through from top to bottom.

3. The elastic pin undercut demoulding mechanism of the plastic turnover box mold according to claim 2 is characterized in that: The inner side of the side wall forming slide (8) is provided with a turnover box side groove forming protrusion (10), and the turnover box side groove forming protrusion (10) corresponds to the side position of the turnover box forming convex seat (3).

4. The elastic pin undercut demoulding mechanism of the plastic turnover box mold according to claim 3 is characterized in that: The inner side of the end wall forming slide (9) is provided with a turnover box end protrusion forming groove (11), and both ends of the turnover box forming convex seat (3) are provided with turnover box end protrusions (12), and the turnover box end protrusion forming groove (11) corresponds to the position of the turnover box end protrusion (12) and the shape is matched.

5. The elastic pin undercut demoulding mechanism of the plastic turnover box mold according to claim 4 is characterized in that: The protruding forming groove (11) at the end of the turnover box opens downward, and the width of the protruding forming groove (11) at the end of the turnover box gradually increases from top to bottom.

6. The elastic pin undercut demoulding mechanism of the plastic turnover box mold according to claim 5, characterized in that: A slide limiting elastic needle component (13) is provided in the turnover box forming upper die (2), and the side wall forming slide (8) and the end wall forming slide (9) are respectively slidably matched with the slide limiting elastic needle component (13).

7. The elastic pin undercut demoulding mechanism of the plastic turnover box mold according to claim 6, characterized in that: The slide limiting elastic needle component (13) includes a plurality of slide limiting elastic needle strips (14) arranged in the turnover box forming upper mold (2), and the slide limiting elastic needle strips (14) are fixed to the turnover box forming upper mold (2) by a plurality of bolts.

8. The elastic pin undercut demoulding mechanism of the plastic turnover box mold according to claim 7, characterized in that: The side wall forming slide (8) and the end wall forming slide (9) are respectively slidably matched with the slide limit elastic needle strip (14), and the slide limit elastic needle strip (14) is arranged in an inclined manner.

9. The elastic pin undercut demoulding mechanism of the plastic turnover box mold according to claim 8, characterized in that: The top of the turnover box forming convex seat (3) is provided with a plurality of turnover box bottom surface groove forming convex strips (15) which are parallel to each other.

10. The elastic pin undercut demoulding mechanism of the plastic turnover box mold according to claim 9, characterized in that: The injection molding diverter (7) comprises an injection molding main plate (16) and an injection molding diverter plate (17) arranged above the turnover box molding upper mold (2).

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