Automatic plastic product demolding structure with inverted buckle structure

Abstract

The utility model discloses a plastic product automatic demoulding structure with a back-off structure, which comprises a rear mould base and a push rod, at least one rear mould insert mounting cavity is arranged on the rear mould base, an insert mounting hole is arranged in the middle of the rear mould insert mounting cavity, and the plastic product automatic demoulding structure is characterized in that a plurality of rear mould inserts are arranged in the insert mounting hole at intervals; an inward shrinkage receding push block is arranged between every two adjacent rear mold inserts, an inward shrinkage receding hole is defined by the multiple rear mold inserts and the inward shrinkage receding push blocks, and the end of the push rod extends into the inward shrinkage receding hole. By the adoption of the mechanism, the problem that in the prior art, a demolding structure of an injection mold is prone to deformation or reverse buckle breakage when used for a plastic part product with an inner ring reverse buckle structure in a forced ejection mode can be effectively solved. The push rod is used for controlling the contraction and expansion movement of the rear mold insert and the inward contraction receding push block, so that a product with an inverted buckle can be automatically demolded after the rear mold insert is contracted.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold especially a plastic product automatic stripping structure with reverse buckle structure. BACKGROUND

[0002] In the process of injection mold, the stripping step is the key step affecting the yield of products. For the plastic product with inner reverse buckle, the inner surface wall of the inner reverse buckle plastic product is provided with at least one inner reverse buckle. The inner reverse buckle plastic product is provided in the cavity of the injection mold.

[0003] The existing injection mold forcibly ejects the inner reverse buckle plastic product after injection molding. However, the plastic product after forced ejection is prone to deformation or reverse buckle fracture, which cannot meet the product standard and causes a certain proportion of defective products, thereby increasing the production cost. SUMMARY

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the utility model aims at providing a plastic product automatic stripping structure with reverse buckle structure.

[0005] The utility model discloses a plastic product automatic stripping structure with reverse buckle structure, including rear mould seat and push rod, be equipped with at least one rear mould insert installation cavity on the rear mould seat, the middle part of rear mould insert installation cavity is equipped with insert installation hole, the insert installation hole is equipped with a plurality of rear mould inserts in interval, be equipped with the inner shrink allowance pusher between two adjacent rear mould inserts, a plurality of rear mould inserts and the inner shrink allowance pusher surround an inner shrink allowance hole, the end of push rod extends in the inner shrink allowance hole. The shrinkage and opening movement of the rear mould insert and the inner shrink allowance pusher are controlled by the push rod, so that the product with reverse buckle can be automatically stripped after the shrinkage of the rear mould insert, and the problem of reverse buckle damage caused by the external force ejection of the product is avoided.

[0006] As an improvement of the plastic product automatic stripping structure with reverse buckle structure of the utility model, the cross section of the inner shrink allowance pusher is an isosceles trapezoid, the cross section of the rear mould insert is a D shape, and the two side slopes of the inner shrink allowance pusher are in contact with the inner side surfaces of the two adjacent rear mould inserts. When the inner shrink allowance pusher shrinks inward, the two side slopes will slide along the inner side surfaces of the rear mould insert, so that the gap between the two adjacent rear mould inserts is reduced to achieve the shrinkage of the rear mould insert.

[0007] As an improvement of the plastic product automatic stripping structure with reverse buckle structure of the utility model, when the push rod moves downward, the plurality of inner shrink allowance pushers shrink toward the center of the inner shrink allowance hole and reduce the gap between the two adjacent rear mould inserts.

[0008] The gap between two adjacent rear mold inserts is reduced, and the plurality of rear mold inserts are simultaneously contracted towards the center of the inner contraction hole.

[0009] As an improvement of the automatic demolding structure of the plastic product with the inverted buckle structure, the rear mold insert has a first contraction part and a first positioning part, the bottom edge of the first positioning part is provided with a first positioning block, the outer side surface of the first contraction part is provided with a first inverted buckle forming protrusion, the thickness of the first positioning part gradually decreases from one end to the other end, and the bottom of the first contraction part is connected to the end with small thickness of the first positioning part.

[0010] As an improvement of the automatic demolding structure of the plastic product with the inverted buckle structure, the inner contraction allowing space push block has a second contraction part and a second positioning end, the bottom edge of the second positioning end is provided with a second positioning block, the outer side surface of the second contraction part is provided with a second inverted buckle forming protrusion, the thickness of the second positioning end gradually decreases from one end to the other end, the bottom of the second contraction part is connected to the end with small thickness of the second positioning end, and the second inverted buckle forming protrusion is aligned with the first inverted buckle forming protrusion.

[0011] As an improvement of the automatic demolding structure of the plastic product with the inverted buckle structure, the inner side surfaces of the rear mold insert and the inner contraction allowing space push block are provided with dovetail grooves, the end part of the push rod is provided with a dovetail block, and the dovetail block is matched with the dovetail groove.

[0012] As an improvement of the automatic demolding structure of the plastic product with the inverted buckle structure, the rear mold insert mounting cavity includes an upper mounting cavity and a lower mounting cavity, the upper mounting cavity and the lower mounting cavity are separated by a partition plate, the insert mounting hole is arranged on the partition plate, the first contraction part and the second contraction part extend from the upper mounting cavity, and the first positioning part and the second positioning end are located in the lower mounting cavity.

[0013] As an improvement of the automatic demolding structure of the plastic product with the inverted buckle structure, an upper pressing plate is arranged in the upper mounting cavity and fixed through screws, and a lower pressing plate is arranged in the lower mounting cavity and fixed through screws.

[0014] As an improvement of the automatic demolding structure of the plastic product with the inverted buckle structure, the bottom of the push rod is connected with a drive, and the drive drives the push rod to move up and down in the inner contraction allowing space hole.

[0015] The utility model discloses an advantageous effect lies in: the utility model discloses its mechanism can effectively solve the demoulding structure of injection mold in the prior art for the plastic product containing the inner ring reverse buckle structure, adopts the forced ejection mode and is easy to appear the problem of deformation or reverse buckle fracture. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the perspective view of the utility model;

[0017] Figure 2 It is the bottom perspective structure schematic diagram of the utility model after removing the lower pressing plate;

[0018] Figure 3 It is the front perspective view of the utility model after removing the front film structure;

[0019] Figure 4 It is the structure schematic diagram of the rear mould insert, inner shrink let -by -push block and push rod of the utility model;

[0020] The figure mark is: 1, rear mould seat, 2, push rod, 3, rear mould insert, 4, inner shrink let -by -push block, 5, inner shrink let -by -hole, 6, swallow -tail groove, 7, upper installation cavity, 8, lower installation cavity, 9, baffle, 10, insert installation hole, 31, first contraction part, 32, first positioning part, 33, first positioning block, 34, first reverse buckle forming protruding, 41, second contraction part, 42, second positioning end, 43, second positioning block, 44, second reverse buckle forming protruding, 71, upper pressing plate, 81, lower pressing plate. DETAILED DESCRIPTION

[0021] The technical schemes in the embodiments of the utility model will be described clearly and completely in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by the person skilled in the art without making creative efforts fall within the protection scope of the utility model.

[0022] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0023] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0024] As shown in Figures 1-4 A plastic product automatic demolding structure with reverse buckle structure, comprising a rear mold base 1 and a push rod 2, the rear mold base 1 is provided with at least one rear mold insert installation cavity, the middle part of the rear mold insert installation cavity is provided with an insert installation hole 10, a plurality of rear mold inserts 3 are arranged in the insert installation hole 10 at intervals, an inner shrinkage displacement push block 4 is arranged between the two adjacent rear mold inserts 3, the plurality of rear mold inserts 3 and the inner shrinkage displacement push block 4 surround an inner shrinkage displacement hole 5, and the end of the push rod 2 extends into the inner shrinkage displacement hole 5. The contraction and expansion movement of the rear mold insert 3 and the inner shrinkage displacement push block 4 is controlled by the push rod 2, so that the rear mold insert 3 can be contracted to automatically demold the product with reverse buckle, avoiding the problem that the reverse buckle is damaged due to the external force to push out the product.

[0025] Preferably, the cross section of the inner shrinkage displacement push block 4 is an isosceles trapezoid, the cross section of the rear mold insert 3 is a D shape, and the two side slopes of the inner shrinkage displacement push block 4 are in contact with the inner side surfaces of the two adjacent rear mold inserts 3 respectively. When the inner shrinkage displacement push block 4 is contracted inward, the two side slopes will slide along the inner side surfaces of the rear mold insert 3, so that the gap between the two adjacent rear mold inserts 3 is reduced to achieve the contraction of the rear mold insert 3.

[0026] Preferably, when the push rod 2 moves downward, the plurality of inner shrinkage displacement push blocks 4 are contracted toward the center of the inner shrinkage displacement hole 5 and the gap between the two adjacent rear mold inserts 3 is reduced.

[0027] When the gap between the two adjacent rear mold inserts 3 is reduced, the plurality of rear mold inserts 3 are simultaneously contracted toward the center of the inner shrinkage displacement hole 5.

[0028] Preferably, the rear mold insert 3 has a first contraction part 31 and a first positioning part 32, the bottom edge of the first positioning part is provided with a first positioning block 33, the outer side surface of the first contraction part 31 is provided with a first reverse buckle forming protrusion 34, the thickness of the first positioning part 32 gradually decreases from one end to the other end, and the bottom of the first contraction part 31 is connected to the end with small thickness of the first positioning part 32.

[0029] Preferably, the inner retraction and displacement push block 4 has a second contraction part 41 and a second positioning end 42, the bottom edge of the second positioning end 42 is provided with a second positioning block 43, the outer side of the second contraction part 41 is provided with a second reverse-shaped protrusion 44, the thickness of the second positioning end 42 gradually decreases from one end to the other end, the bottom of the second contraction part 41 is connected to the end with small thickness of the second positioning end 42, and the second reverse-shaped protrusion 44 is aligned with the first reverse-shaped protrusion 34.

[0030] Preferably, the inner side of the rear mold insert 3 and the inner retraction and displacement push block 4 is provided with a dovetail groove 6, the end of the push rod 2 is provided with a dovetail block 21, and the dovetail block 21 is matched with the dovetail groove 6.

[0031] Preferably, the rear mold insert mounting cavity includes an upper mounting cavity 7 and a lower mounting cavity 8, the upper mounting cavity 7 and the lower mounting cavity 8 are separated by a partition plate 9, the insert mounting hole 10 is arranged on the partition plate 9, the first contraction part 31 and the second contraction part 41 extend from the upper mounting cavity 7, and the first positioning part 32 and the second positioning end 42 are located in the lower mounting cavity 8.

[0032] Preferably, the upper mounting cavity 7 is provided with an upper pressing plate 71, the upper pressing plate 71 is fixed by screws, the lower mounting cavity 8 is provided with a lower pressing plate 81, and the lower pressing plate 81 is fixed by screws.

[0033] Preferably, the bottom of the push rod 2 is connected to a drive (not shown in the figure), the drive can be a pneumatic cylinder, the piston rod end of the pneumatic cylinder is connected to the bottom of the push rod 2, and the drive drives the push rod 2 to move up and down in the inner retraction and displacement hole 5.

[0034] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and structures of the utility model, and the scope of the utility model is defined by the appended claims and their equivalent ranges.

Claims

1. An automatic demolding structure of a plastic product with an undercut structure, comprising a rear mold base and a push rod, wherein the rear mold base is provided with at least one rear mold insert mounting cavity, and a middle part of the rear mold insert mounting cavity is provided with an insert mounting hole, characterized in that, A plurality of back mold inserts are arranged in the insert mounting hole at intervals, and an inner shrinkage clearance block is arranged between two adjacent back mold inserts, and the plurality of back mold inserts and the inner shrinkage clearance block enclose an inner shrinkage clearance hole, and the end of the push rod extends into the inner shrinkage clearance hole.

2. The automatic demolding structure of a plastic product with an undercut structure according to claim 1, wherein The cross section of the inner shrinkage clearance block is an isosceles trapezoid, and the cross section of the back mold insert is a D shape, and the two side slopes of the inner shrinkage clearance block are in contact with the inner side surfaces of the two adjacent back mold inserts, respectively.

3. The automatic demolding structure of a plastic product with an undercut structure according to claim 2, characterized in that, When the push rod moves downward, the plurality of inner shrinkage clearance blocks shrink toward the center of the inner shrinkage clearance hole and reduce the gap between the two adjacent back mold inserts. When the gap between the two adjacent back mold inserts is reduced, the plurality of back mold inserts simultaneously shrink toward the center of the inner shrinkage clearance hole.

4. The automatic demolding structure for plastic products with an undercut structure according to claim 1, characterized in that, The back mold insert has a first shrinkage part and a first positioning part, the bottom edge of the first positioning part is provided with a first positioning block, the outer side surface of the first shrinkage part is provided with a first reverse-shaped raised part, the thickness of the first positioning part gradually decreases from one end to the other end, and the bottom of the first shrinkage part is connected to the end with small thickness of the first positioning part.

5. The automatic demolding structure of a plastic product with an undercut structure according to claim 4, characterized in that, The inner shrinkage clearance block has a second shrinkage part and a second positioning end, the bottom edge of the second positioning end is provided with a second positioning block, the outer side surface of the second shrinkage part is provided with a second reverse-shaped raised part, the thickness of the second positioning end gradually decreases from one end to the other end, the bottom of the second shrinkage part is connected to the end with small thickness of the second positioning end, and the second reverse-shaped raised part is aligned with the first reverse-shaped raised part.

6. The automatic demolding structure for plastic products with an undercut structure according to claim 1, characterized in that, The inner side surfaces of the back mold insert and the inner shrinkage clearance block are provided with dovetail grooves, the end of the push rod is provided with a dovetail block, and the dovetail block cooperates with the dovetail groove.

7. The automatic demolding structure of a plastic product with an undercut structure according to claim 5, wherein The back mold insert mounting cavity includes an upper mounting cavity and a lower mounting cavity, the upper mounting cavity and the lower mounting cavity are separated by a partition plate, the insert mounting hole is arranged on the partition plate, the first shrinkage part and the second shrinkage part extend from the upper mounting cavity, and the first positioning part and the second positioning end are located in the lower mounting cavity.

8. The automatic demolding structure of a plastic product with an undercut structure according to claim 7, characterized in that, An upper pressing plate is arranged in the upper mounting cavity and fixed by a screw, and a lower pressing plate is arranged in the lower mounting cavity and fixed by a screw.

9. The automatic demolding structure of a plastic product with an undercut structure according to claim 1, wherein The bottom of the push rod is connected to a drive, and the drive drives the push rod to move up and down in the inner shrinkage clearance hole.

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