An injection mold for PET boxes

Abstract

The utility model relates to the technical field of shell injection molding device, and provides an injection mold for PET boxes, including: a fixed mold base, a movable mold base, a cavity block and a cavity push block are arranged on the movable mold base, and the cavity block protrudes from the end surface of the movable mold base; a slider assembly, which has two sliders, an elastic member arranged between the slider and the fixed mold base, and a driving block fixed on the fixed mold base; an ejection assembly, which has: a plurality of ejector rods, one end of which is connected to the cavity push block; a driving member, which is cross-shaped and used to reduce the width of the moving channel. Compared with the prior art, the advantage of the utility model is that the driving member responsible for pushing the ejector rod is designed to be cross-shaped, and a moving groove that accurately matches the shape of the driving member is configured on the movable mold base, so as to reduce the width of the moving groove. Without increasing the size and thickness of the mold, the overall structural strength of the mold is improved to ensure that it is competent for the injection molding production process of PET products.

Description

Technical Field

[0001] The utility model relates to the technical field of shell injection molding devices, in particular to an injection molding mold for PET boxes. Background Art

[0002] PET material is a thermoplastic polyester, the full name is polyethyleneterephthalate (PET). It is made by condensation polymerization of terephthalic acid and ethylene glycol. It is a crystalline saturated polyester with a milky white or light yellow appearance. It is a highly crystalline polymer with a smooth and glossy surface. PET material has many advantages, such as excellent mechanical properties, heat resistance, chemical corrosion resistance, good electrical insulation, easy processing, excellent barrier properties and high recyclability. Its upper temperature limit can reach 120°C, and its electrical insulation performance is excellent. It can maintain good electrical properties even under high temperature and high frequency conditions.

[0003] In the food packaging industry, PET material performs outstandingly because it meets food-grade safety standards and is widely used in the manufacture of materials that come into direct contact with food, such as mineral water bottles, cling film, and plastic boxes. When producing PET plastic boxes, in order to meet specific molding requirements, the required pressure is higher than that of ordinary plastic raw materials, which means that the mold used to manufacture PET boxes must be able to withstand this higher molding pressure. Traditionally, in order to withstand the high-pressure injection molding of PET boxes, injection molds often adopt a design strategy of enlarging and thickening the mold. Although this approach can ensure the strength of the mold, it often increases the size and manufacturing cost of the mold. In addition, the sliders of traditional molds are driven by cylinders. In order to fix the cylinders on the mold, it is also necessary to add a structure to the mold to fix the cylinders, which also increases the size of the mold. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an injection mold for a PET box in view of the current status of the prior art.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: to propose an injection mold for PET boxes, comprising: a fixed mold base;

[0006] A movable mold seat, which is movably matched with the fixed mold seat, the movable mold seat is provided with a cavity block for molding the inner cavity structure of the PET box, and a cavity push block movably sleeved on the outside of the cavity block, the cavity block protrudes from the end surface of the movable mold seat facing the fixed mold seat, and the end surface of the cavity push block is flush with the end surface of the movable mold seat;

[0007] A slider assembly, comprising two sliders movably arranged on the fixed die seat, an elastic member arranged between the sliders and the fixed die seat, and a driving block fixed on the fixed die seat, wherein the driving block is used to drive the two sliders to move toward or away from each other;

[0008] The ejector assembly comprises: a plurality of ejector rods movably inserted in the movable mold base, one end of each ejector rod being connected to the cavity push block; a driving member, wherein the movable mold base is provided with a moving channel adapted to the shape of the driving member, the driving member is movably arranged in the moving channel, the other end of each ejector rod is connected to the driving member and is used to push the ejector rod to move in the movable mold base, and the driving member is cross-shaped and is used to reduce the width of the moving channel.

[0009] In the above-mentioned injection mold for PET boxes, a mounting hole connected to the moving channel is provided on the movable mold base, the push rod is inserted into the mounting hole and the diameter of the push rod is smaller than the diameter of the mounting hole, and a spring is provided in the mounting hole, one end of the spring abuts against the top wall of the mounting hole, and the other end abuts against the driving member.

[0010] In the above-mentioned injection mold for PET boxes, a first limiting portion is provided at one end of the driving member away from the push rod, and a first limiting block is provided on the moving channel. The first limiting block movably abuts against the first limiting portion to prevent the end face of the driving member from being higher than the end face of the movable mold base.

[0011] In the above-mentioned injection mold for PET boxes, a parting surface is formed between the two sliders, and the diagonal line of the PET box is located within the parting surface.

[0012] In the above-mentioned injection mold for PET boxes, a T-slot is provided at one end of the two sliders away from each other, a first inclined surface is provided in the T-slot, the driving block has a driving part inserted in the T-slot, and a second inclined surface is provided on the driving part to movably abut against the first inclined surface.

[0013] In the above-mentioned injection mold for PET boxes, a plurality of second limit blocks are arranged on the side of the fixed mold base facing the movable mold base, and the two sliding blocks are each provided with a second limit portion corresponding to the second limit blocks one by one, and the second limit blocks movably abut against the second limit portion.

[0014] Compared with the prior art, the utility model has the advantage that the driving member responsible for pushing the ejector pin is designed to be in a cross shape, and a moving groove that precisely matches the shape of the driving member is configured on the movable mold base, thereby reducing the width of the moving groove. Without increasing the size and thickness of the mold, the overall structural strength of the mold is improved to ensure that it is competent for the injection molding production process of PET products. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of this scheme;

[0016] Figure 2 This is the floor plan of this scheme;

[0017] Figure 3 yes Figure 2 Sectional view along AA direction;

[0018] Figure 4 yes Figure 1 The three-dimensional diagram after the movable mold base and the ejector assembly are omitted;

[0019] Figure 5 yes Figure 4 The stereogram after the slider is omitted;

[0020] Figure 6 It is a stereogram of the slider;

[0021] Figure 7 It is a three-dimensional diagram of the movable mold base;

[0022] Figure 8 It is a three-dimensional view of the ejector assembly.

[0023] In the figure, 1, fixed mold base; 2, movable mold base; 3, cavity block; 4, cavity push block; 5, slider assembly; 6, slider; 7, drive block; 8, ejector assembly; 9, ejector rod; 10, drive member; 11, moving channel; 12, mounting hole; 13, first limit part; 14, first limit block; 15, T-slot; 16, first inclined surface; 17, second inclined surface; 18, second limit block; 19, second limit part. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] An injection mold for a PET box, comprising: a fixed mold base 1; a movable mold base 2, which is movably matched with the fixed mold base 1, and a cavity block 3 for molding the inner cavity structure of the PET box is arranged on the movable mold base 2, and a cavity push block 4 is movably sleeved on the outer side of the cavity block 3, the cavity block 3 protrudes from the end surface of the movable mold base 2 facing the fixed mold base 1, and the end surface of the cavity push block 4 is flush with the end surface of the movable mold base 2; a slider assembly 5, which has two sliders 6 movably arranged on the fixed mold base 1, an elastic member arranged between the sliders 6 and the fixed mold base 1, and a drive block fixed on the fixed mold base 1. The movable block 7 is used to drive the two sliders 6 to move closer to or away from each other; the ejector assembly 8 comprises: a plurality of ejector rods 9 movably inserted in the movable mold base 2, one end of the ejector rod 9 is connected to the cavity push block 4; the driving member 10, the movable mold base 2 is provided with a moving channel 11 adapted to the shape of the driving member 10, the driving member 10 is movably arranged in the moving channel 11, the other end of the ejector rod 9 is connected to the driving member 10, and is used to push the ejector rod 9 to move in the movable mold base 2, and the driving member 10 is cross-shaped and is used to reduce the width of the moving channel 11.

[0026] Based on the above embodiments, an exemplary structure of this solution is as follows: Figures 1 to 8 As shown, two sliders 6 are installed on the fixed mold base 1, and the fixed mold base 1 also integrates four drive blocks 7. Each slider 6 corresponds to two drive blocks 7, and the elastic member is preferably a spring. During the closing process of the injection mold, the movable mold base 2 is close to the two sliders 6 and applies thrust. The function of the drive block 7 is to cause the two sliders 6 to approach each other while moving toward the fixed mold base 1, so as to successfully complete the closing operation of the mold. At this moment, the elastic member is in a compressed state. When the injection mold is opened and the movable mold base 2 moves away from the fixed mold base 1, the elastic member returns to its original length and drives the two sliders 6 to move backward, that is, away from the fixed mold base 1. Thanks to the design of the drive block 7, the two sliders 6 separate from each other when moving, and are separated from the molded PET container. Subsequently, the drive member 10 arranged in the internal moving track of the movable mold base 2 drives the ejector 9 to move, thereby driving the cavity push block 4 to push the PET box to separate from the cavity block 3, and successfully completes the demoulding step of the PET box.

[0027] In this solution, the driving member 10 responsible for pushing the ejector 9 is designed to be cross-shaped, and a moving groove that precisely matches the shape of the driving member 10 is configured on the movable mold base 2, so as to reduce the width of the moving groove. Without increasing the size and thickness of the mold, the overall structural strength of the mold is improved to ensure that it is competent for the injection molding production process of PET products, and the driving block 7 replaces the traditional oil cylinder to push the slider 6 to move, without adding a fixed structure of the oil cylinder, further reducing the volume of the mold.

[0028] A mounting hole 12 connected to the moving channel 11 is provided on the movable mold base 2, and the push rod 9 is inserted into the mounting hole 12 and the diameter of the push rod 9 is smaller than the diameter of the mounting hole 12. A spring is provided in the mounting hole 12, one end of the spring abuts against the top wall of the mounting hole 12, and the other end abuts against the driving member 10.

[0029] Specifically, the driving member 10 is pushed by the power rod on the injection molding machine to move in the movable mold base 2. When the driving member 10 pushes the ejector rod 9 to move toward the fixed mold base 1, the spring is gradually compressed. After the power rod removes the power applied to the driving member 10, the spring returns to the extended state and pushes the driving member 10 to reset. When the driving member 10 is reset, it drives the ejector rod 9 and the cavity push block 4 to reset.

[0030] A first limiting portion 13 is provided at one end of the driving member 10 away from the ejector rod 9 , and a first limiting block 14 is provided on the moving channel 11 . The first limiting block 14 movably abuts against the first limiting portion 13 to prevent the end face of the driving member 10 from being higher than the end face of the movable mold base 2 .

[0031] When the spring drives the driving member 10 to move and reset the driving member 10 , the first limiting block 14 abuts against the first limiting portion 13 to stop the driving member 10 from moving, so that the driving member 10 can accurately move to the initial position.

[0032] A parting surface is formed between the sliders 6, and the diagonal line of the PET box is located within the parting surface, so as to reduce the clamping force between the sliders 6 and the PET box, so that the PET box can be taken out of the mold more easily.

[0033] The ends of the sliders 6 that are away from each other are each provided with a T-slot 15 , and a first inclined surface 16 is provided in the T-slot 15 . The driving block 7 has a driving portion inserted in the T-slot 15 , and a second inclined surface 17 that movably abuts against the first inclined surface 16 is provided on the driving portion.

[0034] When the slider 6 moves under the push of the spring or the movable mold base 2 , the second inclined surface 17 on the driving part pushes the first inclined surface 16 to drive the two sliders 6 to move closer to or farther from each other.

[0035] A plurality of second limit blocks 18 are provided on the side of the fixed mold base 1 facing the movable mold base 2, and the two sliders 6 are provided with second limit parts 19 corresponding to the second limit blocks 18 one by one. The second limit blocks 18 and the second limit parts 19 are movably abutted against each other, and the second limit blocks 18 and the second limit parts 19 are used to limit the two sliders 6 on the fixed mold base 1 to prevent the sliders 6 from separating from the fixed mold base 1.

[0036] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the scope defined by the spirit of the present invention.

Claims

1. An injection mold for a PET box, characterized in that: include: Fixed mold base; A movable mold seat, which is movably matched with the fixed mold seat, the movable mold seat is provided with a cavity block for molding the inner cavity structure of the PET box, and a cavity push block movably sleeved on the outside of the cavity block, the cavity block protrudes from the end surface of the movable mold seat facing the fixed mold seat, and the end surface of the cavity push block is flush with the end surface of the movable mold seat; A slider assembly, comprising two sliders movably arranged on the fixed die seat, an elastic member arranged between the sliders and the fixed die seat, and a driving block fixed on the fixed die seat, wherein the driving block is used to drive the two sliders to move toward or away from each other; The ejector assembly comprises: a plurality of ejector rods movably inserted in the movable mold base, one end of each ejector rod being connected to the cavity push block; a driving member, wherein the movable mold base is provided with a moving channel adapted to the shape of the driving member, the driving member is movably arranged in the moving channel, the other end of each ejector rod is connected to the driving member and is used to push the ejector rod to move in the movable mold base, and the driving member is cross-shaped and is used to reduce the width of the moving channel.

2. An injection mold for a PET box as claimed in claim 1, characterized in that: The movable mold base is provided with a mounting hole connected with the movable channel, the push rod is inserted into the mounting hole and the diameter of the push rod is smaller than the diameter of the mounting hole, and a spring is provided in the mounting hole, one end of the spring abuts against the top wall of the mounting hole, and the other end abuts against the driving member.

3. An injection mold for a PET box as claimed in claim 1, characterized in that: A first limiting portion is provided at one end of the driving member away from the push rod, and a first limiting block is provided on the moving channel. The first limiting block movably abuts against the first limiting portion to prevent the end face of the driving member from being higher than the end face of the movable mold seat.

4. An injection mold for a PET box as claimed in claim 1, characterized in that: A parting surface is formed between the two sliding blocks, and the diagonal line of the PET box is located within the parting surface.

5. An injection mold for a PET box as claimed in claim 1, characterized in that: The ends of the two sliders away from each other are both provided with T-shaped slots, and the T-shaped slots are both provided with first inclined surfaces. The driving block has a driving part inserted in the T-shaped slots, and the driving part is provided with a second inclined surface that movably abuts against the first inclined surface.

6. An injection mold for PET boxes as claimed in claim 1, characterized in that: The fixed mold base is provided with a plurality of second limit blocks on one side facing the movable mold base, and the two sliding blocks are both provided with second limit parts corresponding to the second limit blocks one by one, and the second limit blocks are movably abutted against the second limit parts.

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