Dual-density foam tray forming mold

Abstract

The utility model provides a dual-density foam tray forming mold, and belongs to the technical field of molds. The problems that an existing dual-density foam tray needs two sets of molds, the cost is high, and the forming efficiency is low are solved. The dual-density foam tray forming mold comprises a fixed mold and a movable mold, a first forming cavity used for forming a tray body is formed between the fixed mold and the movable mold, a first injection hole communicated with the first forming cavity is formed in the movable mold, a core pulling body is arranged in the movable mold in a penetrating mode, and when the tray body is formed, the core pulling body is in a push-out state and stretches into the first forming cavity; a second forming cavity is formed between the core-pulling body in the retreating state and the tray body, and a second injection hole communicated with the second forming cavity is formed in the core-pulling body. The tray bodies and the buffer plates with different densities are molded together in the same mold, and the molding efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to die technical field relates to a double density foam tray forming die. BACKGROUND

[0002] With the rapid development of logistics industry and the improvement of intelligent and automatic technology, the demand for transfer trays is gradually increasing, especially the transfer of computers and other electronic products will use trays. For this reason, the applicant has invented a double density foam tray structure [authorized publication number CN217023301U], which comprises a tray body, an inwardly recessed cavity is arranged on the upper end face of the tray body, a buffer plate is arranged in the cavity, the upper end face of the buffer plate is flush with the upper end face of the tray body, and the material density of the buffer plate is less than that of the tray body. The buffer plate is made of low-density foam material, which can reduce the vibration impact of the goods on the tray during transportation; the tray body is made of high-density foam material, which is dense and hard, and has strong anti-collision function.

[0003] The existing processing method for the above-mentioned tray is to first form the tray body in the first set of molds, and then move the tray body to the second set of molds, and form the buffer plate on the tray body in the second set of molds, which has low forming efficiency and low precision. UTILITY MODEL CONTENTS

[0004] The utility model aims at the above-mentioned problems existing in the prior art, and provides a double density foam tray forming die with high forming efficiency.

[0005] The purpose of the utility model can be realized by the following technical schemes:

[0006] The double density foam tray forming die comprises a fixed mold and a movable mold, a first forming cavity for forming a tray body is formed between the fixed mold and the movable mold, a first injection hole communicating with the first forming cavity is arranged on the movable mold, a core pulling body is arranged in the movable mold, the core pulling body is in a pushed-out state and extends into the first forming cavity when the tray body is formed, a second forming cavity is formed between the core pulling body in a retracted state and the tray body, and a second injection hole communicating with the second forming cavity is arranged on the core pulling body.

[0007] When forming, the fixed mold and the movable mold are closed, and the core pulling body is in a pushed-out state, high-density foam material is injected into the first forming cavity through the first injection hole to form the tray body, and then the core pulling body is retracted, low-density foam material is injected into the second forming cavity through the second injection hole to form the buffer plate, and since the tray body does not need to be transferred, the finished tray can be formed by twice injection in the same mold, thereby effectively improving the efficiency.

[0008] In the double-density foam tray forming die, a plurality of guide cavities are arranged on the movable die, the plurality of core-pulling bodies are arranged one by one corresponding to the guide cavities, the guide cavities are slidingly fitted in the guide cavities arranged opposite thereto, and the core-pulling body in the retracted state is flush with the side of the movable die close to the fixed die.

[0009] In the double-density foam tray forming die, a plurality of guide cavities are arranged on the movable die, the plurality of core-pulling bodies are arranged one by one corresponding to the guide cavities, the guide cavities are slidingly fitted in the guide cavities arranged opposite thereto, and the core-pulling body in the retracted state is flush with the side of the movable die close to the fixed die.

[0010] In the double-density foam tray forming die, a plurality of guide cavities are arranged on the movable die, the plurality of core-pulling bodies are arranged one by one corresponding to the guide cavities, the guide cavities are slidingly fitted in the guide cavities arranged opposite thereto, and the core-pulling body in the retracted state is flush with the side of the movable die close to the fixed die.

[0011] In the double-density foam tray forming die, a plurality of guide cavities are arranged on the movable die, the plurality of core-pulling bodies are arranged one by one corresponding to the guide cavities, the guide cavities are slidingly fitted in the guide cavities arranged opposite thereto, and the core-pulling body in the retracted state is flush with the side of the movable die close to the fixed die.

[0012] In the double-density foam tray forming die, a plurality of guide cavities are arranged on the movable die, the plurality of core-pulling bodies are arranged one by one corresponding to the guide cavities, the guide cavities are slidingly fitted in the guide cavities arranged opposite thereto, and the core-pulling body in the retracted state is flush with the side of the movable die close to the fixed die.

[0013] Compared with the prior art, the double-density foam tray forming die has the following advantages:

[0014] In the same die, the tray body and the buffer plate of different densities are formed together, and the forming efficiency is high; when the tray body is formed, the second injection hole is in a blocked state, and waste of high-density foam material is avoided; the core-pulling body is retracted together with the core-pulling body when the plug is retracted, and the structure is designed ingeniously. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a sectional view of the mold provided in Example 1.

[0016] Figure 2 This is a cross-sectional view of the mold forming the tray body provided in Embodiment 2.

[0017] Figure 3 This is a cross-sectional view of the mold forming buffer plate provided in Embodiment 2.

[0018] In the diagram, a) tray body; b) buffer plate; 1) fixed mold; 2) moving mold; 3) core pulling body; 31) second injection hole; 4) moving template; 5) annular limiting groove; 6) limiting ring; 7) guide post; 8) connecting pipe; 9) plug; 10) limiting stop. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] Example 1

[0021] like Figure 1 The dual-density foam tray molding die shown includes a fixed mold 1 and a moving mold 2. A first molding cavity for molding the tray body a is formed between the fixed mold 1 and the moving mold 2. The moving mold 2 is provided with a first injection hole (not shown in the figure) that communicates with the first molding cavity. Four evenly distributed core-pulling bodies 3 are inserted into the moving mold 2. The core-pulling bodies 3 have an extended state and a retracted state. When molding the tray body a, the core-pulling bodies 3 are in the extended state and extend into the first molding cavity. When the core-pulling bodies 3 are in the retracted state, a second molding cavity is formed between the core-pulling bodies 3 and the tray body a. The core-pulling bodies 3 are provided with a second injection hole 31 that communicates with the second molding cavity.

[0022] In order to guide the core-pulling body 3, four guide cavities are provided on the moving mold 2, and the core-pulling body 3 is set in a one-to-one correspondence with the guide cavities. The guide cavities slide and fit in the guide cavities that are opposite to them. When the core-pulling body 3 is in the retracted state, the side of the core-pulling body 3 that is close to the fixed mold 1 is flush with the side of the moving mold 2 that is close to the fixed mold 1.

[0023] During molding, the fixed mold 1 and the moving mold 2 are closed, and the core-pulling body 3 is in the ejection state. High-density foam material is injected into the first molding cavity through the first injection hole to form the tray body a. Then, the core-pulling body 3 is retracted, and low-density foam material is injected into the second molding cavity through the second injection hole to form the buffer plate b. Since there is no need to transfer the tray body a, the finished tray can be formed by two injections in the same mold, which effectively improves efficiency.

[0024] Example 2

[0025] The structural principle of this embodiment is basically the same as that of Embodiment 1, except that, as Figure 2As shown in the drawings, the movable die 2 is provided with a movable die plate 4 on the side away from the fixed die 1, and the movable die plate 4 is provided with four positioning cavities corresponding to the guide cavities, and the core pulling body 3 extends into the corresponding positioning cavity, and the movable die plate 4 and the core pulling body 3 are provided with a first limiting structure for limiting the core pulling body 3.

[0026] As shown in the drawings, Figure 2 The first limiting structure includes an annular limiting groove 5 provided on the inner wall of the positioning cavity and a limiting ring 6 provided on the core pulling body 3, and the limiting ring 6 is clamped in the annular limiting groove 5 by the fiber, and when the limiting ring 6 abuts against the side of the annular limiting groove 5 close to the fixed die 1, the core pulling body 3 is in the pushed-out state, and when the limiting ring 6 abuts against the side of the annular limiting groove 5 away from the fixed die 1, the core pulling body 3 is in the retracted state.

[0027] As shown in the drawings, Figure 2 and Figure 3 The side of the core pulling body 3 away from the fixed die 1 is provided with a guide column 7, the guide column 7 is provided with a connecting pipe 8, the second injection hole 31 is provided in the connecting pipe 8, the guide column 7 is provided with a guide hole, one end of the guide hole penetrates through the side of the core pulling body 3 close to the fixed die 1, the guide hole is provided with a plug 9 and a second limiting structure for limiting the plug 9, the plug 9 in the pushed-out state blocks the guide hole, and the end of the plug 9 close to the fixed die 1 is flush with the side of the core pulling body 3 close to the fixed die 1, and when the plug 9 is in the retracted state, the connecting pipe 8 is communicated with the guide hole.

[0028] As shown in the drawings, Figure 2 and Figure 3 The second limiting structure includes a limiting stop 10 provided at the end of the guide hole away from the fixed die 1, and when the plug 9 abuts against the limiting stop 10, the plug 9 is in the retracted state, the plug 9 is in the form of a circular truncated cone, and the outer diameter thereof decreases as it is closer to the fixed die 1, the guide hole is in the form of a circular cone, and the hole diameter thereof decreases as it is closer to the fixed die 1, and when the outer surface of the plug 9 is in close contact with the inner surface of the guide hole, the plug 9 is in the pushed-out state.

[0029] In this embodiment, the plug 9 is limited at the outer end by the limiting stop 10, and is limited at the inner end by the guide hole in the form of a circular cone and the plug 9 in the form of a circular cone, so that the plug 9 cannot be pulled out of the guide hole.

[0030] In operation, the fixed die 1 and the movable die 2 are closed, the plug 9 is moved to the pushed-out state under the action of the external hydraulic cylinder, and the core pulling body 3 is also moved to the pushed-out state, and then high-density foam material is injected into the first forming cavity through the first injection hole to form the tray body a, and in this process, the second injection hole is blocked by the plug 9. Subsequently, the plug 9 is moved away from the fixed die 1 under the action of the external hydraulic cylinder to the retracted state, and the core pulling body 3 is also moved to the retracted state, and then low-density foam material can be injected into the second forming cavity through the second injection hole to form the buffer plate b.

[0031] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A dual density foam pallet forming mold characterized by, The application relates to a moulding device for moulding a tray body (a), which comprises a fixed mould (1) and a movable mould (2), a first moulding cavity is formed between the fixed mould (1) and the movable mould (2) for moulding the tray body (a), a first injection hole is arranged on the movable mould (2) and communicates with the first moulding cavity, a core pulling body (3) is arranged in the movable mould (2), the core pulling body (3) is in a pushing-out state and extends into the first moulding cavity when the tray body (a) is moulded, a second moulding cavity is formed between the core pulling body (3) in a retracted state and the tray body (a), and a second injection hole (31) is arranged on the core pulling body (3) and communicates with the second moulding cavity.

2. The dual density foam pallet forming mold of claim 1, wherein, A plurality of guide cavities are arranged on the movable mould (2), the core pulling body (3) is in one-to-one correspondence with the guide cavities, the guide cavities are slidably matched in the guide cavities arranged oppositely, and the core pulling body (3) in the retracted state is flush with the side of the movable mould (2) close to the fixed mould (1).

3. The dual density foam pallet forming mold of claim 2, wherein, A movable mould plate (4) is arranged on the side of the movable mould (2) away from the fixed mould (1), the movable mould plate (4) has a plurality of accommodating cavities arranged oppositely with the guide cavities, the core pulling body (3) extends into the accommodating cavity oppositely arranged, and a first limiting structure is arranged between the movable mould plate (4) and the core pulling body (3) for limiting the core pulling body (3).

4. The dual density foam pallet forming mold of claim 3, wherein, The first limiting structure comprises an annular limiting groove (5) arranged on the inner wall of the accommodating cavity and a limiting ring (6) arranged on the core pulling body (3), when the limiting ring (6) abuts against the side of the annular limiting groove (5) close to the fixed mould (1), the core pulling body (3) is in the pushing-out state, and when the limiting ring (6) abuts against the side of the annular limiting groove (5) away from the fixed mould (1), the core pulling body (3) is in the retracted state.

5. The dual density foam pallet forming mold of claim 1 wherein, A guide column (7) is arranged on the side of the core pulling body (3) away from the fixed mould (1), a connecting pipe (8) is arranged on the guide column (7), the second injection hole (31) is arranged in the connecting pipe (8), a guide hole is arranged in the guide column (7), one end of the guide hole penetrates through the side of the core pulling body (3) close to the fixed mould (1), a plug (9) and a second limiting structure for limiting the plug (9) are arranged in the guide hole, the plug (9) in the pushing-out state blocks the guide hole, and the end of the plug (9) close to the fixed mould (1) is flush with the side of the core pulling body (3) close to the fixed mould (1), and the connecting pipe (8) communicates with the guide hole only when the plug (9) is in the retracted state.

6. The dual density foam pallet forming mold of claim 5, wherein, The second limiting structure comprises a limiting stop (10) arranged at the end of the guide hole away from the fixed mould (1), the plug (9) is in the retracted state when the plug (9) abuts against the limiting stop (10), the plug (9) is in the shape of a circular truncated cone, the outer diameter of the plug (9) is smaller when the plug (9) is closer to the fixed mould (1), the guide hole is in the shape of a circular cone, the hole diameter of the guide hole is smaller when the guide hole is closer to the fixed mould (1), and the plug (9) is in the pushing-out state when the outer surface of the plug (9) is close to the inner surface of the guide hole.

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