Mould ejection structure with product protection function

Abstract

The utility model discloses a mold ejection structure with a product protection function, which comprises an ejection structure arranged in a mold, the ejection structure comprises a sleeve rod and an ejection rod, the top of the sleeve rod is concavely provided with a rotatable ball body, the ejection rod is connected in the sleeve rod through a piston, the outer surface of the ejection rod is arranged in a mold cavity through a reset spring, and the ejection rod is connected with the ball body. According to the utility model, the ball body is in contact with the surface of a plastic part and is ejected out, gas is discharged from the periphery of the ball body in the process, the viscosity of the plastic part and a mold is reduced, the ball body is in contact with the plastic part in a rolling manner, and the ejection force is buffered through gas discharge until the gas in the gas storage cavity is emptied; the ejection mode is beneficial to local cooling and hardening of ejection of the plastic part, and obvious deformation and scratch are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a mold ejection structure capable of protecting and demoulding plastic parts. Background Art

[0002] Since plastic parts are formed by thermoplastic molding, the initial temperature of the molded plastic parts is high and the texture is soft. When demolding with the ejection structure in the mold, it is easy to cause scratches on the plastic parts. For some plastic parts with thin thickness and more shapes and structures, there may even be obvious deformation of the plastic parts during demolding and even after ejection. Utility Model Content

[0003] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract and title of the utility model to avoid obscuring the purpose of this section, the abstract and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0004] In order to solve the above-mentioned problems, the present invention provides the following technical solutions: A mold ejection structure with product protection includes: the ejection structure is arranged in the mold;

[0005] The ejection structure includes a sleeve rod and a push rod. A rotatable sphere is recessed on the top of the sleeve rod. The sleeve rod is connected to the push rod through a piston. The outer surface of the push rod is arranged in the mold cavity through a reset spring. The air storage cavity between the piston and the sphere is connected through micropores.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] As a preferred solution of the mold ejection structure with product protection described in the utility model, a ball cavity is opened on the top of the sleeve rod, and the ball part is rolled and arranged in the ball cavity.

[0008] As a preferred solution of the mold ejection structure with product protection described in the utility model, the ball cavity is provided with a through hole connected to the air storage cavity, and the through hole is provided with an air valve.

[0009] As a preferred solution of the mold ejection structure with product protection described in the utility model, the air valve includes a main shell, a sub-shell and a reset member, the main shell is arranged in the through hole, and the outer surface of the main shell is provided with a sub-shell cavity through the reset member, and part of the sub-shell cavity is placed in the shell cavity of the main shell.

[0010] As a preferred solution of the mold ejection structure with product protection described in the utility model, wherein: a pressure-maintaining hole is provided on the auxiliary shell body to connect the shell cavity with the auxiliary shell cavity of the auxiliary shell body.

[0011] As a preferred solution of the mold ejection structure with product protection described in the utility model, the auxiliary shell body is in a pointed cone shape, and the bottom cross-section is larger than the shell cavity cross-section.

[0012] As a preferred solution of the mold ejection structure with product protection described in the present invention, the mold includes an upper mold body and a lower mold body, and the upper mold body and the lower mold body are spliced ​​to form a molding groove.

[0013] As a preferred solution of the mold ejection structure with product protection described in the present invention, the upper mold body and the lower mold body are both provided with a mold cavity, and the ejection structure is arranged in the mold cavity of the lower mold body.

[0014] As a preferred solution of the mold ejection structure with product protection described in the utility model, the bottom of the lower mold body is provided with an ejection hole connected to the mold cavity of the lower mold body, and the bottom pin is arranged at the bottom of the ejector rod between the ejection hole and the mold cavity.

[0015] The beneficial effects of the present invention are as follows: the sphere contacts the surface of the plastic part and ejects it, and during the process, gas is discharged from the surrounding areas of the sphere, reducing the stickiness between the plastic part and the mold. The sphere contacts the plastic part in a rolling manner, and the gas discharge buffers the ejection force until the gas in the gas storage chamber is emptied. This softer ejection method helps to locally cool and harden the plastic part during ejection, avoiding obvious deformation and scratches. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. Among them:

[0017] Figure 1 It is a schematic diagram of the whole embodiment.

[0018] Figure 2 It is a three-dimensional diagram of the ejection structure of this embodiment.

[0019] Figure 3 It is a sectional perspective view of the ejection structure of this embodiment.

[0020] Figure 4 For this embodiment Figure 3 A partial schematic diagram and a three-dimensional diagram of the air valve.

[0021] Figure 5 2 is a cross-sectional view of the gas valve of this embodiment.

[0022] Figure 6 Schematic diagram of the gas valve in this embodiment.

[0023] In the figure; mold 100, upper mold body 101, lower mold body 102, mold cavity 102a, ejection hole 102b, groove 103, bottom pin 104;

[0024] Ejector structure 200, sleeve rod 201, air storage chamber 201a, ball chamber 201b, through hole 201b-1, exhaust port 201-1, ball 202, ejector rod 203, piston 203a, rib 203b, return spring 204;

[0025] The air valve 300 , the main housing 301 , the housing cavity 301 a , the flow area 301 - 1 , the auxiliary housing 302 , the auxiliary housing cavity 302 a , the pressure-maintaining hole 302 b , and the reset member 303 . DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Example

[0030] Reference Figures 1 to 6 , is an embodiment of the present utility model, which provides a mold ejection structure with product protection, including an ejection structure 200 disposed in a mold 100;

[0031] The ejection structure 200 includes a sleeve rod 201 and a push rod 203. A rotatable sphere 202 is recessed on the top of the sleeve rod 201. The sleeve rod 201 is connected to the push rod 203 through a piston 203a. The outer surface of the push rod 203 is set in the mold cavity 102a through a return spring 204. The air storage chamber 201a between the piston 203a and the sphere 202 is connected through micropores.

[0032] Specifically, ejector structure 200 is installed inside mold 100. It consists of a sleeve rod 201 and a push rod 203. A rotatable sphere 202 is located at the top of sleeve rod 201. Sleeve rod 201 is connected to push rod 203 via a piston 203a, while the outer surface of push rod 203 is secured within mold cavity 102a by a return spring 204. Furthermore, an air storage chamber 201a is located between piston 203a and sphere 202. This chamber is connected to the outside world via micropores.

[0033] When push rod 203 is driven by the drive mechanism, piston 203a squeezes gas storage chamber 201a. Due to the presence of micropores, a high pressure is generated inside the gas storage chamber, causing sleeve rod 201 to move upward. At this point, sphere 202 at the top of sleeve rod 201 contacts the thermoformed plastic part in the mold and ejects the plastic part. During this process, sphere 202 rolls against the surface of the plastic part, and gas is expelled around the sphere to reduce the adhesion between the plastic part and the mold surface. The force applied by the sphere during ejection is largely buffered by the gas exhaust until the gas in gas storage chamber 201a is emptied.

[0034] During the entire ejection process, this softer ejection method not only cools the ejection area of ​​the plastic part to a certain extent, but also prevents obvious deformation of the plastic part after ejection. At the same time, the rolling friction contact method of the ball also effectively prevents the plastic part from being scratched.

[0035] For example, Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 As shown, the top of the sleeve 201 is provided with a spherical cavity 201b. The sphere 202 can partially roll within the cavity 201b, leaving its exposed surface acting as a ejection surface. Spherical cavity 201b is connected to the air storage cavity 201a via a through hole 201b-1. A gas valve 300 is mounted on through hole 201b-1, serving as a micropore for the air storage cavity 201a. The gas valve 300 comprises a main housing 301, a secondary housing 302, and a reset member 303. The main housing 301 is mounted within the through hole 201b-1, and its outer surface is connected to the secondary housing 302 via the reset member 303. A portion of the secondary housing 302 is located within the housing cavity 301a of the main housing 301. A pressure-maintaining hole 302b is provided on the secondary housing 302, so that the housing cavity 301a communicates with the secondary housing cavity 302a of the secondary housing 302. The pressure-maintaining hole 302b is also provided to prevent the secondary housing 302 from completely covering the main housing 301, thereby blocking the flow of gas. This would prevent the gas from being discharged, resulting in excessive ejection force and unsatisfactory cushioning effect.

[0036] Here, when the piston 203a squeezes the air storage chamber 201a, the gas flows from the secondary housing chamber 302a and the circulation area 301-1. However, the secondary housing 302 only has a small pressure-maintaining hole 302b. Therefore, the gas will move toward the main housing 301 due to the kinetic energy of the air, thereby reducing the circulation area 301-1. This increases the gas flow rate at the exhaust port 201-1 and reduces the air temperature, accelerating the local cooling of the plastic part. The higher exhaust air flow also expands the range of adhesion between the plastic part and the mold, improving the demolding efficiency. In this way, the length of time that the rib 203b of the ejector pin 203 is in rigid contact with the sleeve rod 201 can be extended, thereby ensuring that even the thinnest plastic part can be ejected with a longer buffer time and extending the gas cooling time, thereby preventing damage to the plastic part during the ejection process.

[0037] For example, Figure 4 、 Figure 5 As shown, the auxiliary housing 302 is in a pointed cone shape, and the bottom cross-section is larger than the cross-section of the housing cavity 301a. This corresponds to the above-mentioned structure of the air valve 300 being simpler and more stable.

[0038] For example, Figure 1 As shown, the mold 100 includes an upper mold body 101 and a lower mold body 102, which are spliced ​​to form a molding groove 103. The upper mold body 101 and the lower mold body 102 are both provided with a mold cavity 102a. The ejection structure 200 is disposed in the mold cavity 102a of the lower mold body 102. The bottom of the lower mold body 102 is provided with an ejection hole 102b that is connected to the mold cavity 102a of the lower mold body 102. The bottom pin 104 is disposed at the bottom of the ejector pin 203 between the ejection hole 102b and the mold cavity 102a.

[0039] The mold 100 consists of an upper mold body 101 and a lower mold body 102, which are spliced ​​together to form a mold groove 103, which determines the shape of the plastic part. There is a mold cavity 102a inside the upper mold body 101 and the lower mold body 102. The ejection structure 200 is installed in the mold cavity 102a of the lower mold body 102. There is an ejection hole 102b at the bottom of the lower mold body 102, which communicates with the mold cavity 102a. The bottom pin 104 is located between the ejection hole 102b and the mold cavity 102a and is installed at the bottom of the ejector rod 203. If a hydraulic rod is used to contact the bottom pin 104 to provide power, the sleeve rod 201 and the ejector rod 203 can be driven to move.

[0040] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, directional changes, etc.) without departing substantially from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also an equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0041] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A mold ejection structure with product protection, characterized by: The ejection structure (200) is arranged in the mold (100); The ejection structure (200) comprises a sleeve rod (201) and a push rod (203); a rotatable sphere (202) is recessed on the top of the sleeve rod (201); the sleeve rod (201) is connected to the push rod (203) via a piston (203a); the outer surface of the push rod (203) is arranged in the mold cavity (102a) via a return spring (204); and the air storage cavity (201a) between the piston (203a) and the sphere (202) is connected via a micropore.

2. The mold ejection structure for protecting a product according to claim 1, wherein: A ball cavity (201b) is provided on the top of the sleeve rod (201), and the ball (202) is partially rolled and arranged in the ball cavity (201b).

3. The mold ejection structure for protecting a product according to claim 2, wherein: The ball cavity (201b) is provided with a through hole (201b-1) connected to the air storage cavity (201a), and an air valve (300) is provided on the through hole (201b-1).

4. The mold ejection structure for protecting a product according to claim 3, wherein: The air valve (300) comprises a main housing (301), a sub-housing (302) and a reset member (303); the main housing (301) is arranged in a through hole (201b-1); the outer surface of the main housing (301) is provided with a sub-housing cavity (302a) via the reset member (303); a portion of the sub-housing cavity (302a) is placed in the housing cavity (301a) of the main housing (301).

5. The mold ejection structure for protecting a product according to claim 4, characterized in that: The auxiliary shell (302) is provided with a pressure-maintaining hole (302b) to enable the shell cavity (301a) to communicate with the auxiliary shell cavity (302a) of the auxiliary shell (302).

6. The mold ejection structure for protecting a product according to claim 5, characterized in that: The auxiliary shell (302) is in a pointed cone shape, and the bottom cross-section is larger than the cross-section of the shell cavity (301a).

7. The mold ejection structure for protecting a product according to claim 1, wherein: The mold (100) comprises an upper mold body (101) and a lower mold body (102), and the upper mold body (101) and the lower mold body (102) are spliced ​​to form a molding groove (103).

8. The mold ejection structure for protecting a product according to claim 7, wherein: The upper mold body (101) and the lower mold body (102) are both provided with a mold cavity (102a), and the ejection structure (200) is arranged in the mold cavity (102a) of the lower mold body (102).

9. The mold ejection structure for protecting a product according to claim 8, wherein: The bottom of the lower mold body (102) is provided with an ejection hole (102b) which is connected to the mold cavity (102a) of the lower mold body (102); the bottom pin (104) is arranged at the bottom of the ejector rod (203) between the ejection hole (102b) and the mold cavity (102a).

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