CN211941867U - Plastic mold structure with fixed mold taper pin - Google Patents
Plastic mold structure with fixed mold taper pin Download PDFInfo
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- CN211941867U CN211941867U CN202020343474.7U CN202020343474U CN211941867U CN 211941867 U CN211941867 U CN 211941867U CN 202020343474 U CN202020343474 U CN 202020343474U CN 211941867 U CN211941867 U CN 211941867U
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Abstract
The utility model discloses a plastic mould structure with cover half taper pin includes, goes up the cover half benevolence, goes up cover half benevolence, lower movable mould board and lower movable mould benevolence, works as go up cover half benevolence with lower movable mould benevolence is closed mutually, go up cover half benevolence with both define out the injection moulding cavity down jointly, the injection moulding cavity is used for shaping convex plastic part. The injection molding cavity is provided with a lateral opening, and the plastic mold structure further comprises a spring pressing plate, a fixed mold inclined pin, a spring guide pillar and a fixed mold spring. The beneficial effects of the utility model reside in that: under the elastic action of the fixed die spring, the fixed die taper pin drives the convex plastic part to move downwards through the lateral convex part, so that the convex plastic part is separated from the upper fixed die core, and the fixed die spring has the characteristics of simple structure, low processing cost, short demolding period and convenience in disassembly and assembly.
Description
Technical Field
The utility model relates to a field of moulding plastics, especially, a plastic mould structure with cover half taper pin.
Background
At present, the following problems exist in the injection molding of convex plastic parts: the demoulding structure of the convex rubber part and the upper fixed mould core is designed to be more complex, and the demoulding process time is longer, so that the production efficiency is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the demoulding problem among the prior art, and provide a novel plastic mould structure with cover half taper pin.
In order to realize the purpose, the technical scheme of the utility model is as follows: the utility model provides a plastic mould structure with cover half taper pin includes, goes up the fixed die plate, goes up the cover half benevolence, lower movable mould board and lower movable mould benevolence, go up the fixed die plate arrange directly over the movable mould board down, go up the cover half benevolence arrange in the bottom surface recess of going up the fixed die plate, lower movable mould benevolence arrange in the top surface recess of movable mould board down, go up the fixed mould benevolence with movable mould benevolence is relative from top to bottom down, works as go up the fixed mould benevolence with lower movable mould benevolence closes mutually, go up the fixed mould benevolence with both define out the injection moulding cavity down jointly in the movable mould benevolence, the injection moulding cavity is used. The injection molding cavity is provided with a lateral opening, the plastic mold structure further comprises a spring pressing plate, a fixed mold inclined pin, a spring guide column and a fixed mold spring, the spring pressing plate is arranged in a groove on the top surface of the upper fixed die plate and is fixedly connected with the upper fixed die plate through a screw, the fixed die inclined pin is obliquely arranged in the upper fixed die core and is positioned at the side of the injection molding cavity, when the upper fixed die core and the lower movable die core are matched, the bottom surface of the fixed die inclined pin is propped against the top surface of the lower movable die core, and the bottom of the fixed die inclined pin just seals the lateral opening, an inclined pin groove is formed on the bottom of the fixed die inclined pin, the angle pin groove faces the lateral opening, so that a lateral convex part arranged in the angle pin groove can be integrally connected to the convex plastic part in the injection molding process; the spring guide pillar is arranged in the upper fixed die plate, the spring guide pillar and the fixed die taper pin have a common axis, the spring guide pillar is located between the spring pressing plate and the fixed die taper pin, the top end of the spring guide pillar extends to the spring pressing plate and abuts against the bottom surface of the spring pressing plate, the bottom end of the spring guide pillar extends downwards to the inside of the fixed die taper pin, the fixed die spring surrounds the periphery of the spring guide pillar, the fixed die spring is provided with an upper spring section and a lower spring section, the upper spring section is arranged in a space defined by the spring guide pillar and the upper fixed die plate, the lower spring section is arranged in a space defined by the spring guide pillar and the fixed die taper pin, and the fixed die spring is always in a compressed state.
As an optimal scheme of a plastic mould structure with a fixed mould taper pin, an taper pin limiting groove is further formed in the upper fixed mould core, a taper pin limiting block is formed on the fixed mould taper pin and is located in the taper pin limiting groove, the fixed mould taper pin moves downwards, the taper pin limiting block can move downwards along the taper pin limiting groove, and when the taper pin limiting block is abutted to the bottom of the taper pin limiting groove, the fixed mould taper pin is prevented from further moving downwards to be separated from the upper fixed mould core.
As a preferable aspect of the plastic mold structure having the stationary mold taper pin, only one of the lateral openings is formed at the bottom of the injection molding chamber.
The utility model also provides another technical scheme, a plastic mould structure with cover half taper pin, include, upper fixed die plate, upper cover half benevolence, lower movable mould board and lower movable mould benevolence, upper fixed die plate arranges in under the movable mould board, upper cover half benevolence arranges in the bottom surface recess of upper fixed die plate, lower movable mould benevolence arranges in the top surface recess of lower movable mould board, upper fixed mould benevolence and lower movable mould benevolence are relative from top to bottom, when upper fixed mould benevolence and lower movable mould benevolence coincide, upper fixed mould benevolence and lower movable mould benevolence both define the injection moulding cavity together, the injection moulding cavity is used for the shaping convex plastic part, its characterized in that, the injection moulding cavity has the side opening, plastic mould structure still includes hexagon socket head screw, cover half taper pin, spring guide pillar, cover half spring and taper pin spacer pin, the inner hexagonal screw is arranged in a groove on the top surface of the upper fixed die plate, the inner hexagonal screw is directly and fixedly connected with the upper fixed die plate, the fixed die taper pin is obliquely arranged in the upper fixed die core and is positioned beside the injection molding cavity, when the upper fixed die core is matched with the lower movable die core, the bottom surface of the fixed die taper pin is abutted against the top surface of the lower movable die core, the bottom of the fixed die taper pin just seals the lateral opening, moreover, a taper pin groove is formed on the bottom of the fixed die taper pin, the taper pin groove faces the lateral opening, so that a lateral convex part arranged in the taper pin groove can be integrally connected on the convex plastic part in the injection molding process, the spring guide pillar is arranged in the upper fixed die plate, and the spring guide pillar and the fixed die taper pin have a common axis, the spring guide pillar is located between the inner hexagonal screw and the fixed die taper pin, the top end of the spring guide pillar extends to the inner hexagonal screw and abuts against the bottom surface of the inner hexagonal screw, the bottom end of the spring guide pillar extends downwards to the inside of the fixed die taper pin, the fixed die spring surrounds the periphery of the spring guide pillar, the fixed die spring is arranged in a space defined by the spring guide pillar and the upper fixed die plate, the fixed die spring is always in a compression state, the top end of the fixed die spring is a fixed end, and the bottom end of the fixed die spring is a movable end.
As an optimal scheme of a plastic mould structure with a fixed mould taper pin, an taper pin limiting groove is further formed in the upper fixed mould core, a taper pin limiting block is formed on the fixed mould taper pin and is located in the taper pin limiting groove, the fixed mould taper pin moves downwards, the taper pin limiting block can move downwards along the taper pin limiting groove, and when the taper pin limiting block is abutted to the bottom of the taper pin limiting groove, the fixed mould taper pin is prevented from further moving downwards to be separated from the upper fixed mould core.
As a preferable aspect of the plastic mold structure having the stationary mold taper pin, only one of the lateral openings is formed at the bottom of the injection molding chamber.
Compared with the prior art, the beneficial effects of the utility model reside in at least: under the elastic action of the fixed die spring, the fixed die angle pin drives the convex plastic part to move downwards through the lateral convex part, so that the convex plastic part is separated from the upper fixed die core, and the fixed die angle pin has the characteristics of simple structure, low cost, short demolding period and convenience in disassembly and assembly.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is the structural schematic diagram of the taper pin limiting block in an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of another embodiment of the present invention.
Fig. 4 is a schematic structural view of a taper pin limiting pin according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Example 1:
referring to fig. 1 to 2, a plastic mold structure with a stationary mold taper pin is shown.
The plastic mold structure belongs to the field of injection molding and is used for molding a convex plastic part 11. The longitudinal section of the convex plastic part 11 is in a shape like a Chinese character 'tu' or a shape like a Chinese character 'tu'.
The plastic mold structure comprises an upper fixed mold plate 2, an upper fixed mold core 3, a lower movable mold plate 4, a lower movable mold core 5, a spring pressing plate 6, a fixed mold taper pin 7, a spring guide pillar 8, a fixed mold spring 9, a taper pin limiting block 10 and the like.
The upper fixed template 2 is arranged right above the lower movable template 4. The upper fixed die core 3 is arranged in a groove on the bottom surface of the upper fixed die plate 2. The lower movable die core 5 is arranged in a groove on the top surface of the lower movable die plate 4. The upper fixed die core 3 is opposite to the lower movable die core 5 up and down. When the upper fixed die core 3 is matched with the lower movable die core 5, the upper fixed die core 3 and the lower movable die core 5 define an injection molding cavity together. The injection molding cavity is used for molding the convex plastic part 11 in the injection molding cavity. Furthermore, the injection molding chamber has a lateral opening. In this embodiment, only one lateral opening is formed in the lower right corner of the injection molding cavity.
The spring pressing plate 6 is arranged in a groove on the top surface of the upper fixed die plate 2. And the spring pressing plate 6 is fixedly connected with the upper fixed template 2 through screws.
The fixed die inclined pin 7 is obliquely arranged in the upper fixed die core 3. The oblique direction is an inward oblique direction. In the present embodiment, the slant direction is a left slant direction, and the fixed mold slanting pin 7 is located at the right side of the injection molding chamber. When the upper fixed die core 3 is matched with the lower movable die core 5, the bottom surface of the fixed die inclined pin 7 is abutted against the top surface of the lower movable die core 5, and the bottom of the fixed die inclined pin 7 just seals the lateral opening. An inclined pin groove 60 is formed in the bottom of the fixed die inclined pin 7, the inclined pin groove 60 faces the lateral opening, so that in the injection molding process, the convex plastic part 11 can be integrally connected with a lateral convex part 12 arranged in the inclined pin groove 60, and the whole body 1 is formed.
The spring guide post 8 is arranged in the upper fixed die plate 2. The spring guide post 8 and the fixed die inclined pin 7 have a common axis. The spring guide post 8 is positioned between the spring pressing plate 6 and the fixed die inclined pin 7. The top end of the spring guide post 8 extends to the spring pressing plate 6 and is abutted against the bottom surface of the spring pressing plate 6. The bottom end of the spring guide post 8 extends downwards to the inside of the fixed die inclined pin 7.
The fixed die spring 9 surrounds the periphery of the spring guide post 8. The fixed die spring 9 is provided with an upper spring section and a lower spring section. The upper spring section is arranged in a space defined by the spring guide post 8 and the upper fixed die plate 2. The lower spring section is arranged in a space defined by the spring guide post 8 and the fixed die inclined pin 7. The fixed die spring 9 is always in a compressed state. The top end of the fixed die spring 9 is a fixed end, the bottom end of the fixed die spring 9 is a movable end, and therefore the fixed die spring 9 exerts downward force on the fixed die inclined pin 7.
An inclined pin limiting groove 30 is formed in the upper fixed die core 3. And an inclined pin limiting block 10 is formed on the fixed die inclined pin 7. The angle pin limiting block 10 is located inside the angle pin limiting groove 30. The fixed die angle pin 7 is moved downwards, and the angle pin limiting block 10 can move downwards along the angle pin limiting groove 30. When the angle pin limiting block 10 abuts against the bottom of the angle pin limiting groove, the fixed die angle pin 7 is prevented from moving downwards further and being separated from the upper fixed die core 3.
The injection molding process of the plastic mold structure is approximately as follows:
step S1, the injection molding machine injects the molten plastic material to fill the injection molding cavity and the taper pin groove 60.
Step S2, cooling the plastic material to obtain the convex plastic part 11 and the lateral protrusion 12, and integrally connecting the convex plastic part 11 and the lateral protrusion 12.
Step S3, the lower moving die plate 4 is moved down, and the lower moving die core 5 moves down along with the lower moving die plate 4. Under the action of the elastic force of the fixed die spring 9, the fixed die inclined pin 7 also moves downwards, and the fixed die inclined pin 7 drives the convex plastic part 11 to move downwards through the lateral convex part 12, so that the convex plastic part 11 is separated from the upper fixed die core 3.
Step S4, when the angle pin limiting block 10 reaches the bottom of the angle pin limiting groove, the fixed die angle pin 7 stops moving downwards; and the lower moving die plate 4 continues to move downwards until reaching a set position, and the convex plastic part 11 is separated from the lower moving die core 5 by an ejection mechanism, so that the demoulding is realized.
And step S5, resetting the above parts and waiting for the next injection molding.
Example 2:
referring to fig. 3 to 4, a plastic mold structure with a fixed mold taper pin is shown.
The plastic mold structure belongs to the field of injection molding and is used for molding a convex plastic part 11.
The plastic mold structure comprises an upper fixed mold plate 2, an upper fixed mold core 3, a lower movable mold plate 4, a lower movable mold core 5, an inner hexagonal screw 6, a fixed mold taper pin 7, a spring guide pillar 8, a fixed mold spring 9, a taper pin limit pin 10 and the like.
The upper fixed template 2 is arranged right above the lower movable template 4. The upper fixed die core 3 is arranged in a groove on the bottom surface of the upper fixed die plate 2. The lower movable die core 5 is arranged in a groove on the top surface of the lower movable die plate 4. The upper fixed die core 3 is opposite to the lower movable die core 5 up and down. When the upper fixed die core 3 is matched with the lower movable die core 5, the upper fixed die core 3 and the lower movable die core 5 define an injection molding cavity together. The injection molding cavity is used for molding the convex plastic part 11 in the injection molding cavity. Furthermore, the injection molding chamber has a lateral opening. In this embodiment, only one lateral opening is formed in the lower right corner of the injection molding cavity.
The inner hexagonal screw is arranged in a groove on the top surface of the upper fixed die plate 2. The inner hexagonal screw 6 is directly and fixedly connected with the upper fixed template 2.
The fixed die inclined pin 7 is obliquely arranged in the upper fixed die core 3. The oblique direction is an inward oblique direction. In the present embodiment, the oblique direction is a left oblique direction. The fixed die inclined pin 7 is arranged at the side of the injection molding cavity. When the upper fixed die core 3 is matched with the lower movable die core 5, the bottom surface of the fixed die taper pin 7 is abutted against the top surface of the lower movable die core 5, and the bottom of the fixed die taper pin 7 just seals the lateral opening. And, an angle pin groove 60 is formed on the bottom of the fixed die angle pin 7, and the angle pin groove 60 faces the lateral opening, so that a lateral convex part 12 arranged inside the angle pin groove 60 can be integrally connected to the convex plastic part 11 in the injection molding process, thereby forming the whole 1.
The spring guide post 8 is arranged in the upper fixed die plate 2. The spring guide post 8 and the fixed die inclined pin 7 have a common axis. The spring guide post 8 is positioned between the inner hexagonal screw 6 and the fixed die taper pin 7. The top end of the spring guide post 8 extends to the inner hexagonal screw 6 and abuts against the bottom surface of the inner hexagonal screw 6. The bottom end of the spring guide post 8 extends downwards to the inside of the fixed die inclined pin 7.
The fixed die spring 9 surrounds the periphery of the spring guide post 8. The fixed die spring 9 is arranged in a space defined by the spring guide post 8 and the upper fixed die plate 2. The fixed die spring 9 is always in a compressed state. The top end of the fixed die spring 9 is a fixed end, the bottom end of the fixed die spring 9 is a movable end, and therefore the fixed die spring 9 exerts downward force on the fixed die inclined pin 7.
An inclined pin limiting groove 30 is formed in the upper fixed die core 3. And an inclined pin limiting pin 10 is formed on the fixed die inclined pin 7. The angle pin limiting pin 10 is located inside the angle pin limiting groove 30. The fixed die inclined pin 7 is moved downwards, and the inclined pin limiting pin 10 can move downwards along the inclined pin limiting groove 30. When the angle pin limiting pin 10 is abutted against the bottom of the angle pin limiting groove, the fixed die angle pin 7 is prevented from moving downwards further and being separated from the upper fixed die core 3.
The injection molding process of the plastic mold structure is approximately as follows:
step S1, the injection molding machine injects the molten plastic material to fill the injection molding cavity and the taper pin groove 60.
Step S2, cooling the plastic material to obtain the convex plastic part 11 and the lateral protrusion 12, and integrally connecting the convex plastic part 11 and the lateral protrusion 12.
Step S3, the lower moving die plate 4 is moved down, and the lower moving die core 5 moves down along with the lower moving die plate 4. Under the action of the elastic force of the fixed die spring 9, the fixed die inclined pin 7 also moves downwards, and the fixed die inclined pin 7 drives the convex plastic part 11 to move downwards through the lateral convex part 12, so that the convex plastic part 11 is separated from the upper fixed die core 3.
Step S4, when the angle pin limiting pin 10 reaches the bottom of the angle pin limiting groove, the fixed die angle pin 7 stops moving downwards; and the lower moving die plate 4 continues to move downwards until reaching a set position, and the convex plastic part 11 on the lower moving die core 5 is ejected out by the ejection mechanism, so that the product is demoulded.
And step S5, resetting the above parts and waiting for the next injection molding.
The above description is only intended to illustrate embodiments of the present invention, and the description is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. A plastic mould structure with a fixed mould taper pin comprises an upper fixed mould plate, an upper fixed mould core, a lower movable mould plate and a lower movable mould core, wherein the upper fixed mould plate is arranged right above the lower movable mould plate, the upper fixed mould core is arranged in a bottom surface groove of the upper fixed mould plate, the lower movable mould core is arranged in a top surface groove of the lower movable mould plate, the upper fixed mould core and the lower movable mould core are opposite up and down, when the upper fixed mould core and the lower movable mould core are matched, an injection molding cavity is defined by the upper fixed mould core and the lower movable mould core together, the injection molding cavity is used for molding a convex plastic part, and the plastic mould structure is characterized in that the injection molding cavity is provided with a lateral opening, the plastic mould structure further comprises a spring pressing plate, a fixed mould taper pin, a spring guide pillar and a spring, and the spring pressing plate is arranged in the top surface groove of the upper fixed mould plate, the spring pressing plate is fixedly connected with the upper fixed template through a screw, the fixed die inclined pin is obliquely arranged in the upper fixed die core and is positioned beside the injection molding cavity, when the upper fixed die core is matched with the lower movable die core, the bottom surface of the fixed die inclined pin is abutted against the top surface of the lower movable die core, the bottom of the fixed die inclined pin just seals the lateral opening, an inclined pin groove is formed in the bottom of the fixed die inclined pin, and the inclined pin groove faces the lateral opening, so that a lateral convex part arranged in the inclined pin groove can be integrally connected to the convex plastic part in the injection molding process; the spring guide pillar is arranged in the upper fixed die plate, the spring guide pillar and the fixed die taper pin have a common axis, the spring guide pillar is located between the spring pressing plate and the fixed die taper pin, the top end of the spring guide pillar extends to the spring pressing plate and abuts against the bottom surface of the spring pressing plate, the bottom end of the spring guide pillar extends downwards to the inside of the fixed die taper pin, the fixed die spring surrounds the periphery of the spring guide pillar, the fixed die spring is provided with an upper spring section and a lower spring section, the upper spring section is arranged in a space defined by the spring guide pillar and the upper fixed die plate, the lower spring section is arranged in a space defined by the spring guide pillar and the fixed die taper pin, and the fixed die spring is always in a compressed state.
2. The plastic mold structure with the fixed mold taper pin as claimed in claim 1, wherein the upper fixed mold core is further formed with a taper pin limiting groove, the fixed mold taper pin is formed with a taper pin limiting block, the taper pin limiting block is located inside the taper pin limiting groove, the fixed mold taper pin is moved downwards, the taper pin limiting block can move downwards along the taper pin limiting groove, and when the taper pin limiting block abuts against the bottom of the taper pin limiting groove, the fixed mold taper pin is prevented from moving downwards further and being separated from the upper fixed mold core.
3. The plastic mold structure with a stationary mold tilt pin according to claim 1, wherein only one of the lateral openings is formed at the bottom of the injection molding chamber.
4. A plastic mould structure with a fixed mould taper pin comprises an upper fixed mould plate, an upper fixed mould core, a lower movable mould plate and a lower movable mould core, wherein the upper fixed mould plate is arranged right above the lower movable mould plate, the upper fixed mould core is arranged in a bottom surface groove of the upper fixed mould plate, the lower movable mould core is arranged in a top surface groove of the lower movable mould plate, the upper fixed mould core and the lower movable mould core are opposite up and down, when the upper fixed mould core and the lower movable mould core are matched, an injection molding cavity is defined by the upper fixed mould core and the lower movable mould core together, the injection molding cavity is used for molding a convex plastic part, and the plastic mould structure is characterized in that the injection molding cavity is provided with a lateral opening, the plastic mould structure further comprises an inner hexagonal screw, a fixed mould taper pin, a spring guide pillar, a spring and a taper pin, and the inner hexagonal screw is arranged in the top surface groove of the upper fixed mould plate, the inner hexagonal screw is directly and fixedly connected with the upper fixed die plate, the fixed die taper pin is obliquely arranged in the upper fixed die core, the fixed die taper pin is arranged at the side of the injection molding cavity, when the upper fixed die core is matched with the lower movable die core, the bottom surface of the fixed die taper pin is abutted against the top surface of the lower movable die core, the bottom of the fixed die taper pin just seals the lateral opening, in addition, a taper pin groove is formed on the bottom of the fixed die taper pin, the taper pin groove faces the lateral opening, so that a lateral convex part arranged in the taper pin groove can be integrally connected on the convex plastic part in the injection molding process, the spring guide pillar is arranged in the upper fixed die plate, the spring guide pillar and the fixed die taper pin have a common axis, and the spring guide pillar is arranged between the inner hexagonal screw and the fixed die taper pin, the top end of the spring guide column extends to the inner hexagonal screw and abuts against the bottom surface of the inner hexagonal screw, the bottom end of the spring guide column extends downwards to the inside of the fixed die taper pin, the fixed die spring surrounds the periphery of the spring guide column, the fixed die spring is arranged in a space defined by the spring guide column and the upper fixed die plate, the fixed die spring is always in a compression state, the top end of the fixed die spring is a fixed end, and the bottom end of the fixed die spring is a movable end.
5. The plastic mold structure with the fixed mold taper pin as claimed in claim 4, wherein the upper fixed mold core is further formed with a taper pin limiting groove, the fixed mold taper pin is formed with a taper pin limiting block, the taper pin limiting block is located inside the taper pin limiting groove, the fixed mold taper pin is moved downwards, the taper pin limiting block can move downwards along the taper pin limiting groove, and when the taper pin limiting block abuts against the bottom of the taper pin limiting groove, the fixed mold taper pin is prevented from moving downwards further and being separated from the upper fixed mold core.
6. The plastic mold structure with a stationary mold tilt pin according to claim 4, wherein only one of the lateral openings is formed at the bottom of the injection molding chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020343474.7U CN211941867U (en) | 2020-03-18 | 2020-03-18 | Plastic mold structure with fixed mold taper pin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020343474.7U CN211941867U (en) | 2020-03-18 | 2020-03-18 | Plastic mold structure with fixed mold taper pin |
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| Publication Number | Publication Date |
|---|---|
| CN211941867U true CN211941867U (en) | 2020-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020343474.7U Active CN211941867U (en) | 2020-03-18 | 2020-03-18 | Plastic mold structure with fixed mold taper pin |
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| CN (1) | CN211941867U (en) |
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- 2020-03-18 CN CN202020343474.7U patent/CN211941867U/en active Active
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