Demolding mechanism for three-plate mold and three-plate mold

Abstract

The invention provides a demolding mechanism for a three-plate mold and the three-plate mold. The demolding mechanism for the three-plate mold comprises a movable insert group and a driving assembly. The movable insert set comprises a fixed insert and a movable insert. The fixed end of the fixed insert is connected with the base plate, the forming end of the fixed insert sequentially penetrates through the rear mold fixing plate and the rear mold forming core in a sliding mode, the fixed insert is provided with a stroke limiting hole and an inner sliding hole which are sequentially communicated, and the inner sliding hole penetrates through the end face of the fixed end of the fixed insert to the end face of the forming end of the fixed insert. The forming end of the movable insert is arranged in the inner sliding hole in a sliding mode, and a sliding limiting part is formed at the end, away from the forming end of the movable insert, of the movable insert. According to the mold, the multiple demolding actions are used for conducting segmented demolding on the cylindrical plastic part, the multiple demolding actions are ingeniously used for replacing the one-time demolding action in the traditional technology, the wrapping force of the cylindrical plastic part is well reduced, and therefore the cylindrical plastic part is easy to demold, and the problem that the cylindrical plastic part is pulled is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of a demoulding mechanism for a three-plate mold of an injection mold, in particular to a demoulding mechanism for a three-plate mold and the three-plate mold. Background Art

[0002] When injection molding a product, if the product cannot be separated from the mold cavity normally, the edges or inner walls of the product and other parts will be pulled by the resistance inside the mold cavity, resulting in a pull defect in the product.

[0003] Generally speaking, during the demolding process of plastic parts, the plastic parts that are prone to the above-mentioned mold pulling situation are mostly cylindrical structures. This is because the cavity of such cylindrical plastic parts needs to adhere to the back mold, which will cause the plastic to form a large clamping force on the back mold core or insert. Therefore, the plastic parts will be affected by the clamping force during the demolding process and easily cause the plastic parts to pull the mold, especially for plastic parts with a more complex cavity structure and a longer longitudinal length of the cavity; Figure 1 and Figure 2 As shown, a cylindrical plastic part 11 (which is the outer shell of a certain projection device) has a cavity 101 formed on its back, and an inner hole 102 formed in the middle of cavity 101 that runs through the front of the plastic part. This means that cavity 101 and inner hole 102 can simultaneously exert a strong clamping force on the mold core or insert. However, the existing practice is to directly eject the plastic part using the rear mold's ejection mechanism after the mold is opened. This ejection method is often difficult to demold. Even if the ejection force of the ejection mechanism is adjusted to force demolding, even if the ejection force is far greater than the clamping force of cavity 101 and inner hole 102, it can easily cause strain defects in the plastic part. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a demolding mechanism and a three-plate mold for a three-plate mold that can demold a cylindrical plastic part in sections, thereby effectively reducing the clamping force of the cylindrical plastic part, making the cylindrical plastic part easy to demold, and thus avoiding the occurrence of tensile defects in the cylindrical plastic part.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A demoulding mechanism for a three-plate mold comprises a rear mold fixing plate, a backing plate, two supporting square irons, a bottom plate, and an ejection assembly; the rear mold fixing plate is embedded with a rear mold forming core, the two supporting square irons are spaced apart between the backing plate and the bottom plate, the ejection assembly is located between the two supporting square irons, and the ejection assembly is used to eject a cylindrical plastic part; the rear mold fixing plate is movably arranged on the backing plate, and the demoulding mechanism for a three-plate mold further comprises:

[0007] The cam is connected to the rear mold fixing plate and the rear mold fixing plate, and the molding end of the rear mold fixing plate is slidably connected to the rear mold fixing plate and the rear mold forming core. The rear mold fixing plate is provided with a stroke limiting hole and an inner sliding hole that are connected in sequence. The stroke limiting hole is located on the fixed end surface of the rear mold fixing plate, and the inner sliding hole passes through the fixed end surface of the rear mold fixing plate to the molding end surface of the rear mold fixing plate. The molding end of the rear mold movable insert is slidably arranged in the inner sliding hole, and the end of the rear mold movable insert away from the molding end of the rear mold movable insert is formed with a sliding limiting portion, and the sliding limiting portion is slidably arranged in the stroke limiting hole; the molding end of the rear mold fixed insert is used to be located in the concave cavity of the cylindrical plastic part during injection molding, and the rear mold forming core is used to adhere to the outer peripheral wall of the cylindrical plastic part during injection molding;

[0008] The driving assembly includes at least two telescopic driving members; each of the telescopic driving members is embedded in the corresponding supporting square iron, and the power output end of each telescopic driving member passes through the pad and is connected to the rear mold fixed plate; after the mold is opened, the power output ends of the two telescopic driving members drive the rear mold fixed plate to move away from the pad, so as to drive the concave cavity of the cylindrical plastic part to be demolded from the molding end of the rear mold fixed insert, and at the same time, the inner hole of the cylindrical plastic part drags the molding end of the rear mold movable insert to slide relative to the inner sliding hole; when the molding end of the rear mold movable insert slides to a preset distance relative to the inner sliding hole, the ejection assembly ejects the cylindrical plastic part.

[0009] In one embodiment, the height of the sliding limit portion is smaller than the depth of the travel limit hole.

[0010] In one embodiment, the backing plate is provided with a fool-proof mounting groove;

[0011] The fixed end of the rear mold fixing insert is convexly provided with an anti-foolproof positioning portion, the anti-foolproof positioning portion is arranged in the anti-foolproof installation groove, and the anti-foolproof positioning portion is detachably connected to the pad.

[0012] In one embodiment, the fool-proof positioning portion is connected or clamped to the backing plate screw.

[0013] In one embodiment, each of the telescopic driving components is a cylinder driving component.

[0014] In one embodiment, the demoulding mechanism for the three-plate mold further includes at least two auxiliary guide slides; the two auxiliary guide slides are respectively fixedly mounted on two symmetrical side surfaces of the rear mold fixing plate;

[0015] The two symmetrical sides of the pad are both provided with alignment grooves, and the two auxiliary guide slides are arranged in a one-to-one correspondence with the two alignment grooves, so that the end side of each auxiliary guide slide is slid into the corresponding alignment groove.

[0016] In one embodiment, the ejection assembly includes a plurality of ejector parts and an ejector fixing plate and an ejector push plate sequentially arranged between the two supporting square irons; the ejector fixing plate is used to fix one end of the plurality of ejector parts, and the other ends of the plurality of ejector parts are sequentially slid through the pad and the rear mold fixed insert to the molding end of the rear mold fixed insert, and the ejector push plate is used to push the ejector fixing plate to move.

[0017] In one embodiment, the demoulding mechanism for the three-plate mold also includes a plurality of the stroke limiters; one end of each of the stroke limiters passes through the pad and is connected to the bottom surface of the rear mold fixing plate, and the other end of the stroke limiter forms a limited hanging platform.

[0018] In one embodiment, the rear mold fixed insert and the rear mold movable insert are both an integrally formed structure.

[0019] A three-plate mold comprises the demoulding mechanism for the three-plate mold described in any one of the above embodiments.

[0020] Compared with the prior art, the present invention has at least the following advantages:

[0021] After the mold is opened, the two telescopic driving parts drive the rear mold fixed plate to move away from the pad, so that the outer peripheral wall of the cylindrical plastic part can be attached to the molding core of the rear mold to drive the concave cavity of the cylindrical plastic part to be demoulded from the molding end of the rear mold fixed insert. Since the inner hole of the cylindrical plastic part is covered by the molding end of the rear mold movable insert, the inner hole of the cylindrical plastic part can drag the molding end of the rear mold movable insert to slide relative to the inner sliding hole, and limit the sliding of the sliding limit part through the stroke limit hole, that is, after the molding end of the rear mold movable insert slides to a preset distance relative to the inner sliding hole, the cylindrical plastic part is ejected by the ejection assembly. Specifically, during the demolding process, the concave cavity of the cylindrical plastic part is first demolded from the molding end of the rear mold fixed insert, so that the concave cavity of the cylindrical plastic part has a tendency to deform toward the center of the inner hole and a deformation space after demolding, and then the ejection assembly is used to eject the cylindrical plastic part, and finally the inner hole of the cylindrical plastic part is demolded from the molding end of the rear mold movable insert, thereby better dispersing the demolding strength of the cylindrical plastic part, thereby reducing the large clamping force of the concave cavity and the inner hole of the cylindrical plastic part on the rear mold fixed insert and the rear mold movable insert. The demolding mechanism for the three-plate mold of the present invention uses multiple demolding actions to demold the cylindrical plastic part in sections, that is, cleverly using multiple demolding actions to replace the single demolding action of the traditional technology, so as to better reduce the clamping force of the cylindrical plastic part, thereby making the cylindrical plastic part easy to demold, thus avoiding the problem of strain defects on the cylindrical plastic part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a structural diagram of a cylindrical plastic part;

[0024] Figure 2 It is a structural diagram of a cylindrical plastic part;

[0025] Figure 3 Schematic diagram of the structure of a demoulding mechanism for a three-plate mold in one embodiment;

[0026] Figure 4 for Figure 3 An exploded schematic diagram of a portion of the structure of a demoulding mechanism for a three-plate mold is shown;

[0027] Figure 5 for Figure 3 The schematic diagram of the structure of the demoulding mechanism for the three-plate mold is shown;

[0028] Figure 6This is a schematic diagram of the state of the inner hole of the cylindrical plastic part before the molding end of the rear mold movable insert moves;

[0029] Figure 7 This is a schematic diagram of the state after the inner hole of the cylindrical plastic part drags the molding end of the rear mold movable insert to move;

[0030] Figure 8 Figure 3 A schematic diagram of a portion of the structure of a demoulding mechanism for a three-plate mold is shown;

[0031] Figure 9 Schematic diagram of the structure of a demoulding mechanism for a three-plate mold in one embodiment;

[0032] Figure 10 for Figure 9 The schematic diagram of the structure of the demoulding mechanism for the three-plate mold is shown;

[0033] Figure 11 Schematic diagram of the structure of a demoulding mechanism for a three-plate mold in one embodiment;

[0034] Figure 12 for Figure 9 A schematic diagram of a portion of the structure of a demoulding mechanism for a three-plate mold is shown;

[0035] Figure 13 for Figure 9 An exploded schematic diagram of a portion of the structure of a demoulding mechanism for a three-plate mold is shown;

[0036] Figure 14 for Figure 9 An exploded schematic diagram of a portion of the structure of a demoulding mechanism for a three-plate mold is shown;

[0037] Figure 15 for Figure 9 An exploded and enlarged schematic diagram of a portion of the structure of a demoulding mechanism for a three-plate mold is shown;

[0038] Figure 16 for Figure 9 A schematic diagram of a portion of the structure of a demoulding mechanism for a three-plate mold is shown;

[0039] Reference numerals: demoulding mechanism 10 for three-plate mold; cylindrical plastic part 11; concave cavity 101; inner hole 102; inner buckle position 103; backing plate 13; foolproof mounting groove 131; alignment slide 132; supporting square iron 14; bottom plate 15; ejector assembly 16; top plate 17; gate plate 18; front mold fixing plate 19; front mold forming core 191; limiting slide 1911; ejector pin 161; ejector fixing plate 162; ejector push plate 163; movable insert assembly 100; rear mold fixing insert 110; travel limiting hole 1101; inner slide Hole 1102; anti-foolproof positioning part 1110; rear mold movable insert 120; sliding limit part 1210; drive assembly 200; telescopic drive part 210; guide slide 300; travel limit part 400; elastic assembly 500; T-shaped guide column 510; elastic part 520; buckle demolding group 600; sliding molding insert 610; drive shovel base 620; elastic pressure plate 630; spring part 640; pressure block part 650; front mold fixed insert 700; sliding avoidance position 701; buckle glue hole 702; limit block 800. DETAILED DESCRIPTION

[0040] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0041] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] The present disclosure provides a demolding mechanism for a three-plate mold, comprising a rear mold fixing plate, a backing plate, two supporting square irons, a bottom plate, and an ejector assembly. The rear mold fixing plate is embedded with a rear mold forming core, the two supporting square irons are spaced between the backing plate and the bottom plate, and the ejector assembly is located between the two supporting square irons. The ejector assembly is used to eject a cylindrical plastic part. The rear mold fixing plate is movably mounted on the backing plate. The demolding mechanism for a three-plate mold also includes a movable insert assembly and a drive assembly. The movable insert group includes a rear mold fixed insert and a rear mold movable insert; the fixed end of the rear mold fixed insert is connected to the pad, and the molding end of the rear mold fixed insert slides through the rear mold fixed plate and the rear mold molding core in sequence, and the rear mold fixed insert is provided with a stroke limiting hole and an inner sliding hole that are connected in sequence, the stroke limiting hole is located at the fixed end face of the rear mold fixed insert, and the inner sliding hole passes through the fixed end face of the rear mold fixed insert to the molding end face of the rear mold fixed insert, the molding end of the rear mold movable insert is slidably arranged in the inner sliding hole, and the end of the rear mold movable insert away from the molding end of the rear mold movable insert is formed with a sliding limiting portion, and the sliding limiting portion is slidably arranged in the stroke limiting hole; the molding end of the rear mold fixed insert is used to be located in the fixed end face of the rear mold fixed insert during injection molding. In the concave cavity of the cylindrical plastic part, the rear mold forming core is used to adhere to the outer peripheral wall of the cylindrical plastic part during injection molding; the driving assembly includes at least two telescopic driving members; each of the telescopic driving members is embedded in the corresponding supporting square iron, and the power output end of each telescopic driving member passes through the pad and is connected to the rear mold fixed plate; after the mold is opened, the power output ends of the two telescopic driving members drive the rear mold fixed plate to move away from the pad, so as to drive the concave cavity of the cylindrical plastic part to be demolded from the forming end of the rear mold fixed insert, and at the same time, the inner hole of the cylindrical plastic part drags the forming end of the rear mold movable insert to slide relative to the inner sliding hole; when the forming end of the rear mold movable insert slides to a preset distance relative to the inner sliding hole, the ejection assembly ejects the cylindrical plastic part.

[0044] See also Figures 1 to 16 In order to better understand the demoulding mechanism 10 for a three-plate mold disclosed herein, the demoulding mechanism 10 for a three-plate mold is further explained below:

[0045] A demolding mechanism 10 for a three-plate mold in one embodiment includes a rear mold fixing plate 12, a backing plate 13, two supporting square irons 14, a bottom plate 15, and an ejector assembly 16. The rear mold fixing plate 12 is embedded with a rear mold forming core 121. The two supporting square irons 14 are spaced apart between the backing plate 13 and the bottom plate 15. The ejector assembly 16 is located between the two supporting square irons 14 and is used to eject the cylindrical plastic part 11. The rear mold fixing plate 12 is movably mounted on the backing plate 13. The demolding mechanism 10 for a three-plate mold also includes a movable insert assembly 100 and a drive assembly 200. The movable insert assembly 100 includes a rear mold fixed insert 110 and a rear mold movable insert 120; the fixed end of the rear mold fixed insert 110 is connected to the backing plate 13, and the molding end of the rear mold fixed insert 110 slides through the rear mold fixed plate 12 and the rear mold molding core 121 in sequence. The rear mold fixed insert 110 is provided with a stroke limit hole 1101 and an inner sliding hole 1102 that are connected in sequence. The stroke limit hole 1101 is located on the fixed end face of the rear mold fixed insert 110. The inner sliding hole 1102 passes through the fixed end surface of the rear mold fixed insert 110 to the molding end surface of the rear mold fixed insert 110, and the molding end of the rear mold movable insert 120 is slidably arranged in the inner sliding hole 1102. The end of the rear mold movable insert 120 away from the molding end of the rear mold movable insert 120 is formed with a sliding limit portion 1210, and the sliding limit portion 1210 is slidably arranged in the stroke limit hole 1101; the molding end of the rear mold fixed insert 110 is used for injection molding. The rear mold core 121 is located in the concave cavity 101 of the cylindrical plastic part 11 during injection molding, and the rear mold forming core 121 is used to adhere to the outer peripheral wall of the cylindrical plastic part 11 during injection molding; the driving assembly 200 includes at least two telescopic driving members 210; each of the telescopic driving members 210 is embedded in the corresponding supporting square iron 14, and the power output end of each telescopic driving member 210 passes through the pad 13 and is connected to the rear mold fixing plate 12; after the mold is opened, the two telescopic driving members 210 are The power output end drives the rear mold fixed plate 12 to move away from the pad 13, so as to drive the concave cavity 101 of the cylindrical plastic part 11 to be demolded from the molding end of the rear mold fixed insert 110. At the same time, the inner hole 102 of the cylindrical plastic part 11 drags the molding end of the rear mold movable insert 120 to slide relative to the inner sliding hole 1102. When the molding end of the rear mold movable insert 120 slides to a preset distance relative to the inner sliding hole 1102, the ejection assembly 16 ejects the cylindrical plastic part 11.

[0046] In this embodiment, after the mold is opened, the two telescopic driving members 210 drive the rear mold fixed plate 12 to move away from the pad 13, so that the outer peripheral wall of the cylindrical plastic part 11 can be attached to the rear mold forming core 121 to drive the concave cavity 101 of the cylindrical plastic part 11 to be demolded from the forming end of the rear mold fixed insert 110. Since the inner hole 102 of the cylindrical plastic part 11 is covered by the forming end of the rear mold movable insert 120, the inner hole 102 of the cylindrical plastic part 11 can drag the forming end of the rear mold movable insert 120 to slide relative to the inner sliding hole 1102, and limit the sliding of the sliding limit part 1210 through the stroke limit hole 1101, that is, after the forming end of the rear mold movable insert 120 slides to a preset distance relative to the inner sliding hole 1102, the cylindrical plastic part 11 is ejected by the ejection assembly 16. Specifically, during the demolding process, the concave cavity 101 of the cylindrical plastic part 11 is first demolded from the molding end of the rear mold fixed insert 110, so that the concave cavity 101 of the cylindrical plastic part 11 has a tendency and deformation space to deform toward the center of the inner hole 102 after demolding, and then the ejection assembly 16 is used to eject the cylindrical plastic part 11, and finally the inner hole 102 of the cylindrical plastic part 11 is demolded from the molding end of the rear mold movable insert 120, thereby better dispersing the demolding strength of the cylindrical plastic part 11, and thereby reducing the large clamping force generated by the concave cavity 101 and the inner hole 102 of the cylindrical plastic part 11 on the rear mold fixed insert 110 and the rear mold movable insert 120. The demoulding mechanism 10 for the three-plate mold of the present invention utilizes multiple demoulding actions to demould the cylindrical plastic part 11 in sections, that is, multiple demoulding actions are cleverly used to replace the single demoulding action of the traditional technology, so as to better reduce the clamping force of the cylindrical plastic part 11, thereby making the cylindrical plastic part 11 easy to demould, thus avoiding the problem of tensile defects of the cylindrical plastic part 11.

[0047] like Figure 1 、 Figure 3 、 Figure 4 、 Figure 6 and Figure 7 As shown, in one embodiment, the height of the sliding limiter 1210 is less than the depth of the travel limiter hole 1101. In this way, the travel limiter hole 1101 can provide a preset sliding distance for the sliding limiter 1210, and the maximum sliding distance is specifically the maximum distance that the inner hole 102 of the cylindrical plastic part 11 can drag the molding end of the rear mold movable insert 120 to slide relative to the inner sliding hole 1102. That is, the sliding limiter 1210 limits the sliding distance of the rear mold movable insert 120. It can be understood that when the rear mold movable insert 120 slides to the maximum distance, the inner hole 102 of the cylindrical plastic part 11 continues to move for demolding, and the inner hole 102 of the cylindrical plastic part 11 will be demolded from the molding end of the rear mold movable insert 120.

[0048] Among them, Figure 6Where a is the depth of the stroke limit hole 1101, b is the height of the sliding limit part 1210, and the value of a minus the value of b is the distance that the inner hole 102 of the cylindrical plastic part 11 can drag the molding end of the rear mold movable insert 120 to slide relative to the inner sliding hole 1102.

[0049] like Figure 3 、 Figure 5 and Figure 8 As shown, in one embodiment, the pad 13 is provided with an anti-foolproof installation groove 131; the fixed end of the rear mold fixing insert 110 is protruding with an anti-foolproof positioning portion 1110, and the anti-foolproof positioning portion 1110 is arranged in the anti-foolproof installation groove 131, and the anti-foolproof positioning portion 1110 is detachably connected to the pad 13.

[0050] It can be understood that by placing the foolproof positioning portion 1110 within the foolproof mounting groove 131 and connecting the foolproof positioning portion 1110 to the backing plate 13, after the mold is opened, the power output ends of the two telescopic drive members 210 drive the rear mold fixing plate 12 to move away from the backing plate 13, thereby driving the cavity 101 of the cylindrical plastic part 11 to be demolded from the molding end of the rear mold fixing insert 110. That is, the rear mold fixing insert 110 remains stationary, and the rear mold fixing plate 12 drives the cylindrical plastic part 11 on the rear mold molding core 121 to move away from the backing plate 13, thereby causing relative movement between the cylindrical plastic part 11 and the molding end of the rear mold fixing insert 110, thereby causing the cavity 101 of the cylindrical plastic part 11 to be demolded from the molding end of the rear mold fixing insert 110. The foolproof positioning portion 1110 and the foolproof mounting groove 131, by adding a foolproof structure, can effectively improve the positioning accuracy of the rear mold fixing insert 110 when the mold assembler is installing the rear mold fixing insert 110.

[0051] like Figure 8 As shown, in one embodiment, the foolproof positioning portion 1110 is screwed or clamped to the backing plate 13. This facilitates mold assemblers to assemble the rear mold fixing insert 110 onto the backing plate 13, thereby securing the rear mold fixing insert 110 to the backing plate 13 and improving the structural stability of the rear mold fixing insert 110 after assembly.

[0052] like Figure 3 、 Figure 5 and Figure 8As shown, in one embodiment, each of the telescopic drive members 210 is a cylinder drive member. In this way, the rear mold fixing plate 12 is driven to move away from the pad 13 by at least two cylinders to ensure the stability of the movement of the rear mold fixing plate 12. Specifically, in this embodiment, there are four cylinders, which are respectively arranged adjacent to the four corners of the mold, thereby providing sufficient thrust for pushing the rear mold fixing plate 12, so that the process of the rear mold fixing plate 12 moving away from the pad 13 is relatively smooth, thereby ensuring that the rear mold fixing plate 12 can effectively drive the rear mold forming core 121 and the cylindrical plastic part 11 attached to the rear mold forming core 121 to perform preliminary demolding, that is, the concave cavity 101 of the cylindrical plastic part 11 is demolded from the molding end of the rear mold fixed insert 110.

[0053] like Figure 3 、 Figure 5 and Figure 8 As shown, in one embodiment, the demoulding mechanism 10 for the three-plate mold also includes at least two auxiliary guide slides 300; the two auxiliary guide slides 300 are respectively fixedly installed on the two symmetrical side surfaces of the rear mold fixing plate 12; the two symmetrical side surfaces of the pad 13 are provided with alignment grooves 132, and the two auxiliary guide slides 300 are arranged in a one-to-one correspondence with the two alignment grooves 132, so that the end side of each auxiliary guide slide 300 slides into the corresponding alignment groove 132.

[0054] like Figures 3 to 5 As shown, in one embodiment, the ejector assembly 16 includes a plurality of ejector parts 161 and an ejector fixing plate 162 and an ejector push plate 163 sequentially arranged between the two supporting square irons 14; the ejector fixing plate 162 is used to fix one end of the plurality of ejector parts 161, and the other ends of the plurality of ejector parts 161 sequentially pass through the pad 13 and the rear mold fixing insert 110 to the molding end of the rear mold fixing insert 110, and the ejector push plate 163 is used to push the ejector fixing plate 162 to move.

[0055] It can be understood that since the projections of the cylindrical plastic part 11 on the parting surface all fall on the molding end of the rear mold fixed insert 110, in this embodiment, by using the other ends of multiple ejector parts 161 to slide through the pad 13 and the rear mold fixed insert 110 in sequence, and making the other ends of the multiple ejector parts 161 reach the molding end of the rear mold fixed insert 110, it is possible to set an exhaust gap in the sliding hole between each ejector part 161 and the rear mold fixed insert 110, thereby not only ensuring the mold cavity exhaust effect, which is beneficial to the molding quality of the concave cavity 101 and the inner hole 102 of the cylindrical plastic part 11, but also enabling the ejector push plate 163 to push the ejector fixing plate 162 to move, and through the ejector fixing plate 162, drive multiple ejectors to eject the cylindrical plastic part 11 at the same time to perform a secondary demolding action.

[0056] like Figure 5 As shown, in one embodiment, the demoulding mechanism 10 for the three-plate mold also includes a plurality of the stroke limit members 400; one end of the plurality of the stroke limit members 400 passes through the pad 13 and is connected to the bottom surface of the rear mold fixing plate 12, and the other end of the stroke limit member 400 forms a limited hanging platform.

[0057] It can be understood that one end of the stroke limiter 400 passes through the pad 13 and is connected to the bottom surface of the rear mold fixing plate 12, so that when the rear mold fixing plate 12 moves away from the pad 13, the stroke limiter 400 is synchronously driven to move, that is, when the rear mold fixing plate 12 moves away from the pad 13 beyond the maximum value of the movement stroke, the limit hanger will abut against the pad 13, thereby limiting the further movement of the rear mold fixing plate 12. In this way, the movement stroke of the rear mold fixing plate 12 can be effectively limited to ensure the structural rationality and structural coordination of the demolding action of the cylindrical plastic part 11.

[0058] like Figure 4 As shown, in one embodiment, the rear mold fixed insert 110 and the rear mold movable insert 120 are both integrally formed. In this way, while ensuring the injection molding quality of the cylindrical plastic part 11, the rear mold fixed insert 110 and the rear mold movable insert 120 have good structural connection strength.

[0059] like Figures 8 to 12 As shown, in one embodiment, the demolding mechanism 10 for a three-plate mold further includes a plurality of elastic components 500; the plurality of elastic components 500 are evenly distributed between the rear mold fixing plate 12 and the backing plate 13. In this way, when the telescopic driving member 210 drives the rear mold fixing plate 12 to move away from the backing plate 13, the elastic restoring force of the plurality of elastic components 500 can assist the telescopic driving member 210 in pushing the rear mold fixing plate 12 away from the backing plate 13, thereby effectively improving the stability and smoothness of the movement of the rear mold fixing plate 12.

[0060] Furthermore, in one embodiment, each of the elastic components 500 includes a T-shaped guide column 510 and an elastic member 520, wherein the elastic member 520 is movably mounted on the small end of the T-shaped guide column 510, the large end of the T-shaped guide column 510 abuts against the rear mold fixing plate 12, and the small end of the T-shaped guide column 510 slides through the pad 13. In this way, when the telescopic driving member 210 drives the rear mold fixing plate 12 to move away from the pad 13, due to the presence of the elastic reset force, one end of the elastic member 520 abuts against the pad 13, and the other end of the elastic member 520 abuts against the large end face of the T-shaped guide column 510, thereby driving the large end of the T-shaped guide column 510 to push the rear mold fixing plate 12 away from the pad 13.

[0061] Furthermore, in one embodiment, the elastic member 520 may be a spring member or an elastic rubber member.

[0062] like Figures 9 to 16 As shown, an inner buckle position 103 is also provided on the inner wall of the front side of the cylindrical plastic part 11. Therefore, in order to ensure that the inner buckle position 103 is formed during the injection molding stage and that the inner buckle position 103 can be effectively demolded during the demolding stage, the problem of structural interference of the cylindrical plastic part 11 during the demolding process is avoided. In one embodiment, the demolding mechanism 10 for the three-plate mold further includes a top plate 17, a sprue plate 18, a front mold fixing plate 19 and a buckle demolding group 600 connected in sequence; the front mold fixing plate 19 is embedded with a front mold forming core 191, and the front mold forming core 191 is used to fix the front mold fixing insert 700, wherein, when the mold is closed, the front mold forming core 191, the front mold fixing insert 700, the rear mold forming core 121, the rear mold fixing insert 110 and the rear mold movable insert 120 together form an injection molding cavity (not shown in the figure), and the injection molding cavity is used to injection mold the cylindrical plastic part 11, the molding end of the buckle demolding group 600 is slidably connected to the front mold fixing insert 700, and the molding end of the buckle demolding group 600 is used to mold the inner buckle position 103, and when the mold is opened, it slides away from the inner buckle position 103 relative to the front mold fixing insert 700. In this way, the inner buckle position 103 can be formed by the molding end of the buckle demolding group 600, and at the same time as the mold is opened, the molding end of the buckle demolding group 600 slides relative to the front mold fixed insert 700 to disengage from the inner buckle position 103, thereby realizing the demolding action of the inner buckle position 103, and finally making the cylindrical plastic part 11 adhere to the rear mold molding core 121.

[0063] like Figures 13 to 16As shown, in one embodiment, one end of the molding end away from the front mold fixed insert 700 is penetrated and set at the top of the front mold molding core 191, and is provided with a sliding avoidance position 701 and a buckle sealing hole 702; the buckle demoulding group 600 includes a sliding molding insert 610, a driving shovel base 620 and an elastic pressure plate 630; the sliding molding insert 610 and the driving shovel base 620 are arranged between the elastic pressure plate 630 and the front mold molding core 191, and the driving shovel base 620 is fixedly connected to the elastic The pressure plate 630, the sliding molding insert 610 is slidingly connected to the driving shovel base 620, and the sliding molding insert 610 and the driving shovel base 620 slidingly connected portion are arranged in the sliding avoidance position 701, and the molding end of the sliding molding insert 610 is arranged in the buckle sealing hole 702, and the elastic pressure plate 630 is used to drive the driving shovel base 620 to move away from the front mold molding core 191, so that the driving shovel base 620 drives the molding end of the sliding molding insert 610 to disengage from the inner buckle position 103.

[0064] It can be understood that in this embodiment, when the forming end of the sliding molding insert 610 is disposed in the buckle position sealing hole 702, the forming end of the sliding molding insert 610 is used to form the inner buckle position 103. The elastic pressure plate 630 is embedded in the back of the front mold forming core 191. When the mold is opened, the elastic pressure plate 630 drives the driving shovel base 620 to move away from the front mold forming core 191. Furthermore, because the sliding molding insert 610 is slidably connected to the driving shovel base 620, the driving shovel base 620 can drive the forming end of the sliding molding insert 610 to slide away from the inner buckle position 103, thereby achieving the demolding action of the inner buckle position 103, thereby effectively avoiding the problem of structural interference of the inner buckle position 103 of the cylindrical plastic part 11 during the demolding process.

[0065] like Figure 12 and Figure 14 As shown, in one embodiment, there is an angle between the sliding direction of the driving shovel base 620 and the mold opening direction, that is, the angle gradually increases in the direction from the front mold forming core 191 to the elastic pressure plate 630, so that when the driving shovel base 620 drives the sliding forming insert 610 to slide, the forming end of the sliding forming insert 610 can slide out of the inner buckle position 103, that is, the oblique movement of the driving shovel base 620 is converted into the horizontal demolding movement of the forming end of the sliding forming insert 610. The structure is ingenious and improves the overall structural compactness of the buckle demolding group 600 while ensuring the structural rationality of the buckle demolding group 600.

[0066] like Figure 12As shown, in one embodiment, a plurality of spring members 640 are provided on the side of the elastic pressure plate 630 facing the front mold core 191. The elastic restoring force of the spring members 640 can be used to push the elastic pressure plate 630 away from the front mold core 191, thereby ensuring that the driving shovel base 620 can drive the sliding molding insert 610 to slide. Specifically, the spring members 640 are fixedly mounted by being sheathed on a screw member, which is simple and reliable. The threaded end of the screw member is connected to the elastic pressure plate 630.

[0067] like Figure 14 As shown, in one embodiment, the sliding molding insert 610 and the driving shovel base 620 are connected by a dovetail groove sliding connection structure. In this way, the stability and smoothness of the sliding connection between the sliding molding insert 610 and the driving shovel base 620 are better ensured.

[0068] like Figures 12 to 16 As shown, in one embodiment, a limiting slide groove 1911 connected to the sliding avoidance position 701 is provided at the top of the front mold forming core 191, and one end of the sliding forming insert 610 away from the forming end of the sliding forming insert 610 is slidably set in the limiting slide groove 1911; the buckling demolding group 600 also includes a pressing block 650, and the pressing block 650 is set in the limiting slide groove 1911, and the pressing block 650 is used to prevent the sliding forming insert 610 from falling out of the limiting slide groove 1911.

[0069] like Figure 16 As shown, in one embodiment, the snap-in demolding group 600 further includes at least two limit blocks 800, and the two limit blocks 800 are relatively arranged on the back of the front mold fixing plate 19, and the two limit blocks 800 are used to limit the movement stroke of the elastic pressure plate 630. In this way, the elastic pressure plate 630 is effectively prevented from escaping from the back of the front mold fixing plate 19, thereby ensuring the subsequent reset action of the elastic pressure plate 630. It should be noted that the basic mold opening action principle of the three-plate mold is the existing technology, and the demolding mechanism of the present application is based on the demolding action performed after the basic mold opening action of the three-plate mold is completed or during the mold opening action. As Figure 10 As shown, this is the state after the top plate 17, the sprue plate 18 and the front mold fixing plate 19 have completed the mold opening action, wherein there is a mold opening gap between the top plate 17 and the front mold fixing plate 19 adjacent to the two sides of the sprue plate 18, so that the snap-in demolding group 600 has movement space.

[0070] The present application also provides a three-plate mold, comprising the demoulding mechanism 10 for the three-plate mold described in any of the above embodiments.

[0071] In this embodiment, the three-plate mold adopts the above-mentioned demolding mechanism for the three-plate mold, so that after the mold is opened, the two telescopic driving members drive the rear mold fixed plate to move away from the pad, so that the outer peripheral wall of the cylindrical plastic part can be attached to the molding core of the rear mold to drive the concave cavity of the cylindrical plastic part to be demolded from the molding end of the rear mold fixed insert. Since the inner hole of the cylindrical plastic part is covered by the molding end of the rear mold movable insert, the inner hole of the cylindrical plastic part can drag the molding end of the rear mold movable insert to slide relative to the inner sliding hole, and limit the sliding of the sliding limit part through the stroke limit hole, that is, after the molding end of the rear mold movable insert slides to a preset distance relative to the inner sliding hole, the cylindrical plastic part is ejected by the ejection assembly. Specifically, during the demolding process, the concave cavity of the cylindrical plastic part is first demolded from the molding end of the rear mold fixed insert, so that the concave cavity of the cylindrical plastic part has a tendency to deform toward the center of the inner hole and a deformation space after demolding, and then the ejection assembly is used to eject the cylindrical plastic part, and finally the inner hole of the cylindrical plastic part is demolded from the molding end of the rear mold movable insert, thereby better dispersing the demolding strength of the cylindrical plastic part, thereby reducing the large clamping force of the concave cavity and the inner hole of the cylindrical plastic part on the rear mold fixed insert and the rear mold movable insert. The demolding mechanism for the three-plate mold of the present invention uses multiple demolding actions to demold the cylindrical plastic part in sections, that is, cleverly using multiple demolding actions to replace the single demolding action of the traditional technology, so as to better reduce the clamping force of the cylindrical plastic part, thereby making the cylindrical plastic part easy to demold, thus avoiding the problem of strain defects on the cylindrical plastic part.

[0072] Compared with the prior art, the present disclosure has at least the following advantages:

[0073] After the mold is opened, the two telescopic driving parts drive the rear mold fixed plate to move away from the pad, so that the outer peripheral wall of the cylindrical plastic part can be attached to the molding core of the rear mold to drive the concave cavity of the cylindrical plastic part to be demoulded from the molding end of the rear mold fixed insert. Since the inner hole of the cylindrical plastic part is covered by the molding end of the rear mold movable insert, the inner hole of the cylindrical plastic part can drag the molding end of the rear mold movable insert to slide relative to the inner sliding hole, and limit the sliding of the sliding limit part through the stroke limit hole, that is, after the molding end of the rear mold movable insert slides to a preset distance relative to the inner sliding hole, the cylindrical plastic part is ejected by the ejection assembly. Specifically, during the demolding process, the concave cavity of the cylindrical plastic part is first demolded from the molding end of the rear mold fixed insert, so that the concave cavity of the cylindrical plastic part has a tendency to deform toward the center of the inner hole and a deformation space after demolding, and then the ejection assembly is used to eject the cylindrical plastic part, and finally the inner hole of the cylindrical plastic part is demolded from the molding end of the rear mold movable insert, thereby better dispersing the demolding strength of the cylindrical plastic part, thereby reducing the large clamping force of the concave cavity and the inner hole of the cylindrical plastic part on the rear mold fixed insert and the rear mold movable insert. The demolding mechanism for the three-plate mold of the present invention uses multiple demolding actions to demold the cylindrical plastic part in sections, that is, cleverly using multiple demolding actions to replace the single demolding action of the traditional technology, so as to better reduce the clamping force of the cylindrical plastic part, thereby making the cylindrical plastic part easy to demold, thus avoiding the problem of strain defects on the cylindrical plastic part.

[0074] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A demoulding mechanism for a three-plate mold, comprising a rear mold fixing plate, a pad, two supporting square irons, a bottom plate and an ejector assembly; the rear mold fixing plate is embedded with a rear mold forming core, the two supporting square irons are spaced between the pad and the bottom plate, the ejector assembly is located between the two supporting square irons, the ejector assembly is used to eject the cylindrical plastic part, the rear mold fixing plate is movably arranged on the pad, and is characterized in that: The demoulding mechanism for the three-plate mold further includes: The cam is connected to the rear mold fixing plate and the rear mold fixing plate, and the molding end of the rear mold fixing plate is slidably connected to the rear mold fixing plate and the rear mold forming core. The rear mold fixing plate is provided with a stroke limiting hole and an inner sliding hole that are connected in sequence. The stroke limiting hole is located on the fixed end surface of the rear mold fixing plate, and the inner sliding hole passes through the fixed end surface of the rear mold fixing plate to the molding end surface of the rear mold fixing plate. The molding end of the rear mold movable insert is slidably arranged in the inner sliding hole, and the end of the rear mold movable insert away from the molding end of the rear mold movable insert is formed with a sliding limiting portion, and the sliding limiting portion is slidably arranged in the stroke limiting hole; the molding end of the rear mold fixed insert is used to be located in the concave cavity of the cylindrical plastic part during injection molding, and the rear mold forming core is used to adhere to the outer peripheral wall of the cylindrical plastic part during injection molding; The driving assembly includes at least two telescopic driving members; each of the telescopic driving members is embedded in the corresponding supporting square iron, and the power output end of each telescopic driving member passes through the pad and is connected to the rear mold fixed plate; after the mold is opened, the power output ends of the two telescopic driving members drive the rear mold fixed plate to move away from the pad, so as to drive the concave cavity of the cylindrical plastic part to be demolded from the molding end of the rear mold fixed insert, and at the same time, the inner hole of the cylindrical plastic part drags the molding end of the rear mold movable insert to slide relative to the inner sliding hole; when the molding end of the rear mold movable insert slides to a preset distance relative to the inner sliding hole, the ejection assembly ejects the cylindrical plastic part.

2. The demoulding mechanism for a three-plate mold according to claim 1, characterized in that: The height of the sliding limiting portion is smaller than the depth of the stroke limiting hole.

3. The demoulding mechanism for a three-plate mold according to claim 1, characterized in that: The pad is provided with a foolproof installation groove; The fixed end of the rear mold fixing insert is convexly provided with an anti-foolproof positioning portion, the anti-foolproof positioning portion is arranged in the anti-foolproof installation groove, and the anti-foolproof positioning portion is detachably connected to the pad.

4. The demoulding mechanism for a three-plate mold according to claim 3, characterized in that: The foolproof positioning portion is screw-connected or clamped to the backing plate.

5. The demoulding mechanism for a three-plate mold according to claim 3, characterized in that: Each of the telescopic driving components is a cylinder driving component.

6. The demoulding mechanism for a three-plate mold according to claim 1, characterized in that: The demoulding mechanism for the three-plate mold further includes at least two auxiliary guide slides; the two auxiliary guide slides are respectively fixedly mounted on two symmetrical side surfaces of the rear mold fixing plate; The two symmetrical sides of the pad are both provided with alignment grooves, and the two auxiliary guide slides are arranged in a one-to-one correspondence with the two alignment grooves, so that the end side of each auxiliary guide slide is slid into the corresponding alignment groove.

7. The demoulding mechanism for a three-plate mold according to claim 1, characterized in that: The ejector assembly includes a plurality of ejector parts and an ejector fixing plate and an ejector push plate sequentially arranged between the two supporting square irons; the ejector fixing plate is used to fix one end of the plurality of ejector parts, and the other ends of the plurality of ejector parts are sequentially slid through the pad and the rear mold fixed insert to the molding end of the rear mold fixed insert, and the ejector push plate is used to push the ejector fixing plate to move.

8. The demoulding mechanism for a three-plate mold according to claim 1, characterized in that: The demoulding mechanism for the three-plate mold also includes multiple stroke limiters; one end of each of the stroke limiters passes through the pad and is connected to the bottom surface of the rear mold fixing plate, and the other end of the stroke limiter forms a limited hanging platform.

9. The demoulding mechanism for a three-plate mold according to claim 1, characterized in that: The rear mold fixed insert and the rear mold movable insert are both an integrally formed structure.

10. A three-plate mold, characterized in that: The demoulding mechanism for a three-plate mold comprises the demoulding mechanism according to any one of claims 1 to 9.

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