CN223904472U - An automatic demolding structure for plastic products with an inverted design. - Google Patents
An automatic demolding structure for plastic products with an inverted design.Info
- Publication number
- CN223904472U CN223904472U CN202520361278.5U CN202520361278U CN223904472U CN 223904472 U CN223904472 U CN 223904472U CN 202520361278 U CN202520361278 U CN 202520361278U CN 223904472 U CN223904472 U CN 223904472U
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- CN
- China
- Prior art keywords
- rear mold
- mounting cavity
- positioning
- plastic products
- undercut
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
本实用新型公开了一种具有倒扣结构的塑胶产品自动脱模结构，包括后模座和推杆，后模座上设有至少一个后模镶件安装空腔，后模镶件安装空腔的中部设有镶件安装孔，其特征在于，镶件安装孔内间隔设置有多个后模镶件，相邻的两个后模镶件之间设有内缩让位推块，多个后模镶件和内缩让位推块围成一个内缩让位孔，推杆的端部伸入在内缩让位孔内。本实用新型采用其机构，能够有效的解决现有技术中注塑模具的脱膜结构对于含内圈倒扣结构的塑件制品，采用强制顶出的方式容易出现变形或者倒扣断裂的问题。通过推杆来控制后模镶件和内缩让位推块的收缩和张开的运动，使后模镶件收缩后能够使有倒扣的产品自动脱模。
This utility model discloses an automatic demolding structure for plastic products with an undercut structure, including a rear mold base and a push rod. The rear mold base has at least one rear mold insert mounting cavity, and the center of the rear mold insert mounting cavity has an insert mounting hole. The key feature is that multiple rear mold inserts are spaced apart within the insert mounting hole, and an inward retraction ejector block is provided between two adjacent rear mold inserts. The multiple rear mold inserts and the inward retraction ejector block form an inward retraction hole, and the end of the push rod extends into the inward retraction hole. This utility model, using this mechanism, can effectively solve the problem in the prior art where the demolding structure of injection molds easily leads to deformation or undercut breakage when using forced ejection for plastic products with an inner undercut structure. The push rod controls the contraction and opening movements of the rear mold inserts and the inward retraction ejector block, allowing the undercut product to be automatically demolded after the rear mold inserts contract.
Description
Technical Field
The utility model relates to an injection mold, in particular to an automatic demolding structure for a plastic product with a back-off structure.
Background
In the injection mold process, the demolding step belongs to a key step affecting the product yield, and for a plastic product with an inner back-off, at least one circle of inner back-off is arranged on the inner surface wall of the inner back-off plastic product, and the injection molded inner back-off plastic product is arranged in a cavity of the injection mold.
After the internal back-off plastic product is injection molded by the existing injection mold, the movable mold push rod is adopted to forcedly push out, but deformation or back-off fracture of the forcedly pushed out plastic product is easy to occur, the product setting standard cannot be met, defective products with a certain proportion are caused, and the manufacturing cost is increased.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model aims to provide an automatic demolding structure for a plastic product with a back-off structure.
The automatic demolding structure for the plastic product with the back-off structure comprises a back mold seat and a push rod, wherein at least one back mold insert installation cavity is formed in the back mold seat, an insert installation hole is formed in the middle of the back mold insert installation cavity, a plurality of back mold inserts are arranged in the insert installation hole at intervals, an inward shrinkage yielding push block is arranged between two adjacent back mold inserts, an inward shrinkage yielding hole is formed by surrounding the plurality of back mold inserts and the inward shrinkage yielding push block, and the end part of the push rod stretches into the inward shrinkage yielding hole. The push rod is used for controlling the shrinkage and the expansion of the rear mold insert and the inward shrinkage abdication push block, so that the product with the back-off can be automatically demolded after the rear mold insert is shrunk, and the problem that the back-off is damaged due to the fact that the product is ejected by external force is avoided.
As an improvement of the automatic demolding structure of the plastic product with the back-off structure, the cross section of the inward shrinkage yielding push block is in an equilateral trapezoid, the cross section of the rear mold insert is in a D shape, and the inclined planes at two sides of the inward shrinkage yielding push block are respectively contacted with the inner side surfaces of two adjacent rear mold inserts. When the inward shrinkage abdication push block is shrunk inwards, the inclined planes at two sides can slide along the inner side surfaces of the rear mold inserts, so that the gap between two adjacent rear mold inserts is reduced to achieve shrinkage of the rear mold inserts.
As an improvement of the automatic demolding structure of the plastic product with the back-off structure, when the push rod moves downwards, the inward shrinkage yielding push blocks shrink towards the center of the inward shrinkage yielding hole, and the gap between two adjacent back mold inserts is reduced;
When the gap between two adjacent rear mold inserts is reduced, a plurality of rear mold inserts shrink towards the center of the shrinkage-in abdication hole at the same time.
As an improvement of the automatic demolding structure of the plastic product with the back-off structure, the rear mold insert is provided with a first shrinkage part and a first positioning part, a first positioning block is arranged at the bottom edge of the first positioning part, a first back-off forming protrusion is arranged on the outer side surface of the first shrinkage part, the thickness from one end to the other end of the first positioning part is gradually reduced, and the bottom of the first shrinkage part is connected with one end with small thickness of the first positioning part.
As an improvement of the automatic demolding structure of the plastic product with the back-off structure, the inward shrinkage yielding push block is provided with a second shrinkage part and a second positioning end, a second positioning block is arranged at the bottom edge of the second positioning end, a second back-off forming protrusion is arranged on the outer side face of the second shrinkage part, the thickness from one end of the second positioning end to the other end of the second positioning end is gradually reduced, the bottom of the second shrinkage part is connected with one end with small thickness at the second positioning end, and the second back-off forming protrusion is aligned with the first back-off forming protrusion.
As an improvement of the automatic demolding structure of the plastic product with the back-off structure, the inner side surfaces of the back mold insert and the inward shrinkage yielding push block are provided with dovetail grooves, the outer side surface of the end part of the push rod is provided with a dovetail block, and the dovetail block is matched with the dovetail grooves.
As an improvement of the automatic demolding structure of the plastic product with the back-off structure, the rear mold insert mounting cavity comprises 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 formed in the partition plate, the first shrinkage part and the second shrinkage part extend out of the upper mounting cavity, and the first positioning part and the second positioning end are located in the lower mounting cavity.
As an improvement of the automatic demolding structure of the plastic product with the back-off structure, an upper pressing plate is arranged in the upper mounting cavity and is fixed through screws, and a lower pressing plate is arranged in the lower mounting cavity and is fixed through screws.
As an improvement of the automatic demolding structure of the plastic product with the back-off 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 inward shrinkage abdication hole.
The mechanism has the beneficial effects that the mechanism can effectively solve the problem that the demoulding structure of the injection mould in the prior art is easy to deform or break the back-off for a plastic part product with the inner ring back-off structure by adopting a forced ejection mode. The push rod is used for controlling the shrinkage and expansion movements of the rear mold insert and the shrinkage abdication push block, so that the product with the back-off can be automatically demolded after the rear mold insert is shrunk.
Drawings
FIG. 1 is a perspective view of the present utility model;
FIG. 2 is a schematic view of the bottom perspective of the present utility model with the lower platen removed;
FIG. 3 is a front perspective view of the present utility model with the front film structure removed;
FIG. 4 is a schematic view of the structure of the rear mold insert, the retraction relief block and the push rod of the present utility model;
The reference numerals are: 1, a rear die holder, 2, a push rod, 3, a rear die insert, 4, an inward shrinkage abdicating push block, 5, an inward shrinkage abdicating hole, 6, a dovetail groove, 7, an upper mounting cavity, 8, a lower mounting cavity, 9, a partition plate, 10, an insert mounting hole, 31, a first shrinkage part, 32, a first positioning part, 33, a first positioning block, 34, a first back-off forming protrusion, 41, a second shrinkage part, 42, a second positioning end, 43, a second positioning block, 44, a second back-off forming protrusion, 71, an upper pressing plate, 81 and a lower pressing plate.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used only to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present utility model.
As shown in fig. 1-4, an automatic demolding structure for plastic products with a back-off structure comprises a back mold base 1 and a push rod 2, wherein at least one back mold insert installation cavity is arranged on the back mold base 1, an insert installation hole 10 is formed in the middle of the back mold insert installation cavity, a plurality of back mold inserts 3 are arranged in the insert installation hole 10 at intervals, an inward shrinkage yielding push block 4 is arranged between two adjacent back mold inserts 3, a plurality of back mold inserts 3 and the inward shrinkage yielding push block 4 enclose an inward shrinkage yielding hole 5, and the end part of the push rod 2 stretches into the inward shrinkage yielding hole 5. The push rod 2 is used for controlling the shrinkage and expansion movements of the rear mold insert 3 and the shrinkage abdication push block 4, so that the product with the back-off can be automatically demolded after the rear mold insert 3 is shrunk, and the problem that the back-off is damaged due to the fact that the product is ejected by external force is avoided.
Preferably, the cross section of the retraction yielding push block 4 is in an equilateral trapezoid, the cross section of the rear mold insert 3 is in a D shape, and the inclined planes at two sides of the retraction yielding push block 4 are respectively contacted with the inner side surfaces of the two adjacent rear mold inserts 3. When the inward shrinkage abdication push block 4 is shrunk inwards, the inclined planes at two sides can slide along the inner side surface of the rear mold insert 3, so that the gap between two adjacent rear mold inserts 3 is reduced to achieve shrinkage of the rear mold insert 3.
Preferably, when the push rod 2 moves downwards, the plurality of inward shrinkage yielding push blocks 4 shrink inwards at the center of the inward shrinkage yielding holes 5, and the gap between two adjacent rear mold inserts 3 is reduced;
When the gap between two adjacent rear mold inserts 3 is reduced, the plurality of rear mold inserts 3 simultaneously shrink inwardly to the center of the relief hole 5.
Preferably, the rear mold insert 3 has a first shrinkage portion 31 and a first positioning portion 32, a first positioning block 33 is provided at a bottom edge of the first positioning portion, a first inverted molding protrusion 34 is provided on an outer side surface of the first shrinkage portion 31, a thickness from one end to the other end of the first positioning portion 32 is gradually reduced, and a bottom of the first shrinkage portion 31 is connected to one end of the first positioning portion 32 having a small thickness.
Preferably, the retraction yielding push block 4 is provided with a second contraction part 41 and a second positioning end 42, a second positioning block 43 is arranged at the bottom edge of the second positioning end 42, a second back-off forming protrusion 44 is arranged on the outer side surface of the second contraction part 41, the thickness from one end to the other end of the second positioning end 42 is gradually reduced, the bottom of the second contraction part 41 is connected with one end with small thickness at the second positioning end 42, and the second back-off forming protrusion 44 is aligned with the first back-off forming protrusion 34.
Preferably, the inner side surfaces of the rear mold insert 3 and the inward shrinkage abdication pushing block 4 are provided with a dovetail groove 6, the outer side surface of the end part of the pushing rod 2 is provided with a dovetail block 21, and the dovetail block 21 is matched with the dovetail groove 6.
Preferably, the rear mold insert mounting cavity comprises 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 9, an insert mounting hole 10 is formed in the partition 9, a first shrinkage portion 31 and a second shrinkage portion 41 extend from the upper mounting cavity 7, and a first positioning portion 32 and a second positioning end 42 are located in the lower mounting cavity 8.
Preferably, an upper pressing plate 71 is arranged in the upper mounting cavity 7, the upper pressing plate 71 is fixed by a screw, a lower pressing plate 81 is arranged in the lower mounting cavity 8, and the lower pressing plate 81 is fixed by a screw.
Preferably, the bottom of the push rod 2 is connected with a drive (not shown), the drive can be an air cylinder, the end part of a piston rod of the air cylinder is connected with the bottom of the push rod 2, and the drive drives the push rod 2 to move up and down in the retraction abdication hole 5.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations may be made therein without departing from the principles and structure of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202520361278.5U CN223904472U (en) | 2025-03-04 | 2025-03-04 | An automatic demolding structure for plastic products with an inverted design. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202520361278.5U CN223904472U (en) | 2025-03-04 | 2025-03-04 | An automatic demolding structure for plastic products with an inverted design. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN223904472U true CN223904472U (en) | 2026-02-13 |
Family
ID=98723095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202520361278.5U Active CN223904472U (en) | 2025-03-04 | 2025-03-04 | An automatic demolding structure for plastic products with an inverted design. |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN223904472U (en) |
-
2025
- 2025-03-04 CN CN202520361278.5U patent/CN223904472U/en active Active
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