Male die for forming plastic foam box
By setting up an intake passage and a plug-in pillar in the molding of the plastic foam box, the front mold and the rear mold are driven by the pneumatic cylinder to separate the front mold and inflate the bottom of the foam box, the damage problem during the molding of the plastic foam box is solved, and the effect of flat mold release and labor saving is achieved.
Patent Information
- Application Number
- CN202422440514.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-10-10
AI Technical Summary
Plastic foam boxes are prone to damage when they are demolded, especially the foam boxes are more likely to be damaged. The contact area of the existing ejection structure is small and uneven, which leads to difficulty in demolding.
A mould for plastic foam box forming is designed, including a front mold and a rear mold. An air intake channel is provided in the front mold, and a plug cylinder and an air pressure cylinder are provided on the rear mold. The front mold and the rear mold are driven to separate the front mold and the rear mold through the air intake channel, and the bottom of the foam box is inflated to achieve uniform mold release.
The flat mold release of the foam box is achieved, avoiding damage, and the mold release process is more labor-saving.
Smart Images
Figure CN223211838U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a mold for rubber and plastic molding, in particular to a convex mold for molding plastic foam boxes, belonging to a plastic machinery component. Background Art
[0002] Plastic foam boxes are made by injection molding on an injection molding machine using a mold. The mold consists of a punch and a die. The punch is used to form the cavity, while the die is used to support the outer contour. Together, the two form the molded cavity, and the plastic component is injected to form the box. After the box is formed, due to the cooling effect, the box will get stuck on the punch during demolding and will not fall off. How to remove the box from the punch is a problem that has plagued the industry. To solve this problem, an ejector structure has been developed. This ejector structure is set in the punch to push the plastic box down. However, due to the small contact area and uneven contact surface, it is easy to be damaged, especially for foam boxes. Utility Model Content
[0003] The utility model aims to provide a convex die for forming a plastic foam box, so as to solve the problem in the prior art that the plastic foam box is easily damaged during demoulding.
[0004] In order to solve the above problems, the punch for forming a plastic foam box involved in the utility model adopts the following technical solution: a punch for forming a plastic foam box, characterized in that it includes a front mold and a rear mold, the front mold and the rear mold are spliced at the contact surface, an air intake channel is opened in the front mold, a sealing column is convexly provided on the rear mold, the sealing column and the air intake channel are gap-fitted, a sealing surface facing rearward is provided in the air intake channel, the front end of the sealing column has a mating surface, the sealing surface and the mating surface are sealed and fitted when the front mold and the rear mold are spliced together, a pneumatic cylinder for driving the front mold and the rear mold to be spliced and separated is provided on the rear mold, the piston rod of the pneumatic cylinder is fixed to the front mold, and an air intake hole extending to the contact surface is opened on the rear mold.
[0005] The front end of the sealing column is provided with a sealing head extending to the front end surface of the front mold, and the sealing head is matched with the peripheral surface of the air inlet channel.
[0006] The cylinder body of the pneumatic cylinder is fixed on the rear surface of the rear mold, and the piston rod extends out from a through hole opened on the rear mold.
[0007] The air inlet passage is a stepped hole, and the sealing surface is the step surface of the stepped hole.
[0008] The contact surface is a plane.
[0009] The four sides of the front mold are all provided with demoulding angles.
[0010] The front mold of the utility model is provided with an air inlet channel. During molding, the air inlet channel is blocked by the sealing column. During demoulding, the pneumatic cylinder pushes the front mold away from the rear mold, and a gap appears between the two. The matching surface of the sealing column leaves the sealing surface, and air is inflated from the air inlet hole. The gas reaches the bottom of the foam box through the air inlet channel, and demoulding is performed by uniform air pressure, which is not easy to damage the foam box.
[0011] The front end of the sealing column of the utility model is provided with a sealing head extending to the front end surface of the front mold, and the sealing head is matched with the peripheral surface of the air inlet channel, so that the bottom of the foam box has no bulge and is more flat.
[0012] The four sides of the front mold of the utility model are all provided with demoulding angles, which makes demoulding more labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] 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:
[0014] Figure 1 A three-dimensional diagram of an embodiment of the present invention in one direction;
[0015] Figure 2 A three-dimensional diagram of an embodiment of the present invention in another direction;
[0016] Figure 3 This is a three-dimensional diagram of the front mold and the rear mold of an embodiment of the utility model after being separated;
[0017] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure of the rear mold;
[0018] Figure 5 for Figure 1 Schematic diagram of the three-dimensional structure of the front mold. DETAILED DESCRIPTION
[0019] In order to make the technical objectives, technical solutions, and beneficial effects of the present invention more clear, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in a variety of different configurations.
[0020] The specific embodiment of the punch for forming the plastic foam box involved in the utility model is as follows: Figure 1-Figure 5In the figure, the front mold 1 and the rear mold 2 are joined at the contact surface, which is a plane. The front mold 1 is provided with two air inlet channels 3. The air inlet channels 3 are stepped holes with a stepped surface facing the rear mold, i.e., facing the rear. This stepped surface is a sealing surface 4. Two sealing columns 5 are convexly provided on the front surface of the rear mold 2, i.e., the contact surface of the rear mold 2. The sealing columns 5 extend into the air inlet channels 3, and the two are clearance-fitted. The sealing columns 5 have a forward-facing mating surface 6. Specifically, the sealing column 5 is a stepped shaft with a head 7 at the front end. The stepped surface of the sealing column 5 is the mating surface 6. When the front mold 1 and the rear mold 2 are joined, the mating surface 6 and the sealing surface 4 are sealed and the two are contact-sealed. The head 7 extends into the air inlet channel 3 and is flush with the front surface of the front mold 1. In addition, the head 7 is matched with the circumferential surface of the air inlet channel 3. A pneumatic cylinder 9 is fixed to the rear mold 2. Its cylinder body 10 is fixed to the rear surface of the rear mold 2. A piston rod 11 extends through a through-hole in the rear mold 2. The front end of the piston rod 11 is fixed to the front mold 1. When the pneumatic cylinder 9 is in operation, it drives the front and rear molds together and apart. The rear mold 2 also has an air inlet 8, which extends to the contact surface of the rear mold 2. During use, the air inlet is equipped with an air inlet pipe for air intake.
[0021] Draft angles are provided on all four sides of the front mold 1 .
[0022] A sealing head is provided in this embodiment, but it may not be provided in other embodiments, and the mating surface is the front end surface of the sealing column.
[0023] The contact surface in this embodiment is a plane, and may also be a curved surface.
[0024] The mold of the foam box is the existing technology. When in use, the concave mold adopts the existing concave mold. When the mold is opened, the concave mold moves away and the foam box remains on the punch. The piston of the pneumatic cylinder extends, the front mold and the rear mold are separated, and the foam box moves relative to the rear mold and does not leave the rear mold. The sealing column and the rear mold move backward relative to each other, the sealing surface and the mating surface are separated, and air is inflated through the air inlet hole. The gas enters the bottom of the foam box through the gas channel, pushes the foam box, and realizes demolding.
[0025] Finally, it should be noted that the above embodiments are only used to illustrate and not to limit the technical solutions of the present invention. Any equivalent replacement of the present invention and any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.
Claims
1. A plastic foam box molding punch, characterized in that: It includes a front mold and a rear mold, which are assembled at the contact surface. An air intake channel is provided in the front mold, and a sealing column is convexly provided on the rear mold. The sealing column is gap-fitted with the air intake channel. A sealing surface facing rearward is provided in the air intake channel, and the front end of the sealing column has a fitting surface. The sealing surface and the fitting surface are sealed and fitted when the front mold and the rear mold are assembled. A pneumatic cylinder for driving the front mold and the rear mold to be assembled and separated is provided on the rear mold, and the piston rod of the pneumatic cylinder is fixed to the front mold. An air intake hole extending to the contact surface is provided on the rear mold.
2. The punch for forming a plastic foam box according to claim 1, wherein: The front end of the sealing column is provided with a sealing head extending to the front end surface of the front mold, and the sealing head is matched with the peripheral surface of the air inlet channel.
3. The punch for forming a plastic foam box according to claim 2, wherein: The cylinder body of the pneumatic cylinder is fixed on the rear surface of the rear mold, and the piston rod extends out from a through hole opened on the rear mold.
4. The punch for forming a plastic foam box according to claim 3, wherein: The air inlet passage is a stepped hole, and the sealing surface is the step surface of the stepped hole.
5. The punch for forming a plastic foam box according to claim 2, wherein: The contact surface is a plane.
6. The punch for forming a plastic foam box according to claim 5, wherein: The four sides of the front mold are all provided with demoulding angles.