Teaching plastic mold frame with replaceable core

Abstract

The utility model discloses a kind of fast replaceable mould core type plastic mould frame for teaching, it is related to plastic mould frame technical field, including upper die and lower die, upper die covers in lower die top, lower die includes core fixing plate and the core installed in its inner side, core fixing plate is equipped with core installation slot at middle position, core fixing plate inside is provided with the ejection mechanism extending into core installation slot, and the ejection mechanism drives core and moves up along vertical direction and exits core installation slot, the utility model designs the bottom surface of core fixing plate into openwork shape, and bottom countersunk screw hole is designed into thread hole, to install core into core fixing plate from parting surface, realize fast replacement effect, simultaneously, core fixing plate is designed as openwork structure with through-hole, avoid interference with ejector pin, in addition, mould cavity is also installed into mould cavity fixing plate from parting surface in the same way.

Description

Technical Field

[0001] This utility model relates to the field of plastic mold frame technology, specifically a quick-change mold core type plastic mold frame for teaching purposes. Background Technology

[0002] The plastic mold frame is the basic framework of a plastic mold, used to fix and support the mold's core components such as the cavity, core, and guiding mechanism, ensuring stable mold operation. It is the mold's "skeleton," determining its overall structure and assembly precision.

[0003] Mold frames used in vocational school mold-making programs are primarily used to test students' ability to manufacture plastic mold working parts, namely cores and cavities. During teaching, students need to install the processed mold working parts into the mold and perform injection molding to check the processing effect of the mold working parts by evaluating the quality of the plastic parts. Traditional mold frames are designed based on the shape of the parts and the mold working parts together, resulting in poor interchangeability and inconvenient assembly and disassembly. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a quick-change mold core plastic mold frame for teaching.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a quick-change mold core plastic mold frame for teaching, comprising an upper mold and a lower mold, wherein the upper mold covers the top of the lower mold, and the lower mold includes a core fixing plate and a core installed inside it. A core mounting groove is provided in the middle position of the core fixing plate, and an ejection mechanism extending into the core mounting groove is provided inside the core fixing plate, and the ejection mechanism drives the core to move vertically out of the core mounting groove.

[0006] The ejection mechanism described above includes an ejector, a rotating component, a telescopic rod, and a pressure block. The ejector penetrates the core fixing plate and abuts against one end of the rotating component. The telescopic rod is fixed inside the core fixing plate, and its telescopic end is connected to the pressure block. The end of the pressure block away from the telescopic rod abuts against the other end of the rotating component. The middle part of the rotating component is rotatably connected to the core fixing plate.

[0007] As described above, the telescopic rod includes an inner rod and an outer rod. The outer rod is sleeved outside the inner rod, and a spring is sleeved on one end of the inner rod that extends out of the outer rod. The spring is located between the pressure block and the outer rod.

[0008] As described above, the core is mounted circumferentially in the core mounting slot by at least two countersunk screws.

[0009] As described above, the lower mold also includes two equal-height shims, an ejector pin fixing plate, an ejector pin pad, and a lower mold fixing plate. The two equal-height shims, the ejector pin fixing plate, and the ejector pin pad are all located between the core fixing plate and the lower mold fixing plate. The ejector pin fixing plate and the ejector pin pad are both located between the two equal-height shims, and the ejector pin fixing plate is located above the ejector pin pad.

[0010] As described above, the bottom of the core fixing plate is provided with a through hole communicating with the core mounting groove, and the top of the ejector pin fixing plate is provided with an ejector pin, which penetrates the core.

[0011] As described above, the upper mold includes an upper mold fixing plate and a cavity fixing plate. The cavity fixing plate is fixed to the bottom of the upper mold fixing plate, and a cavity matching the core is installed on the end of the cavity fixing plate away from the upper mold fixing plate by countersunk screws.

[0012] Compared with existing technologies, this quick-change mold core plastic mold frame for teaching has the following advantages:

[0013] I. This utility model designs the bottom surface of the core fixing plate as a hollow shape and the bottom countersunk screw hole as a threaded hole, so that the core can be installed into the core fixing plate from the parting surface, achieving a quick change effect. At the same time, the core fixing plate is designed as a hollow structure with through holes to avoid interference with the ejector pin. In addition, the cavity is also installed into the cavity fixing plate from the parting surface in the same way, thereby realizing the replacement of mold core and cavity without disassembling the mold frame, improving the utilization rate of the core, and also significantly shortening the core replacement time.

[0014] Second, this utility model is equipped with an ejection mechanism, which can automatically eject the core from the core fixing plate after the countersunk screw is removed, thereby facilitating the removal and replacement of the core from the core fixing plate, further improving the core replacement efficiency and making operation easier.

[0015] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is an exploded view of the present invention;

[0018] Figure 3 This is a three-dimensional cross-sectional view of the lower mold of this utility model;

[0019] Figure 4for Figure 3 Enlarged structural diagram at point A;

[0020] Figure 5 This is a bottom view of the upper mold of this utility model.

[0021] In the diagram: 1. Upper mold; 101. Upper mold fixing plate; 102. Cavity fixing plate; 103. Cavity; 2. Lower mold; 21. Core; 22. Core fixing plate; 221. Core mounting groove; 23. Equal height shim; 24. Ejector pin fixing plate; 25. Ejector pin pad; 26. Lower mold fixing plate; 3. Ejector component; 4. Rotating component; 5. Telescopic rod; 6. Pressure block. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1-5 As shown, this utility model provides a technical solution: a quick-change mold core plastic mold frame for teaching, including an upper mold 1 and a lower mold 2. The upper mold 1 covers the top of the lower mold 2. The lower mold 2 includes a core fixing plate 22 and a core 21 installed inside it. A core mounting groove 221 is provided in the middle position of the core fixing plate 22. An ejection mechanism is provided inside the core fixing plate 22, extending into the core mounting groove 221. The ejection mechanism drives the core 21 to move vertically and exit the core mounting groove 221.

[0024] like Figure 4 As shown, the ejection mechanism includes an ejector 3, a rotating member 4, a telescopic rod 5, and a pressure block 6. The ejector 3 penetrates the core fixing plate 22 and abuts against one end of the ejector 3 and the rotating member 4. The telescopic rod 5 is fixed inside the core fixing plate 22, and the telescopic end of the telescopic rod 5 is connected to the pressure block 6. The end of the pressure block 6 away from the telescopic rod 5 abuts against the other end of the rotating member 4. The middle part of the rotating member 4 is rotatably connected to the core fixing plate 22.

[0025] The telescopic rod 5 includes an inner rod and an outer rod. The outer rod is sleeved outside the inner rod. A spring is sleeved on one end of the inner rod that extends out of the outer rod. The spring is located between the pressure block 6 and the outer rod. In the initial state of the spring, the inner rod extends out of the outer rod and drives the pressure block 6 to press down the rotating part 4 to the bottom. The rotating part 4 is a lever structure. Its middle part is rotatably connected to the core fixing plate 22 through a rotating shaft. The elastic force of the spring helps the inner rod to return to its original position.

[0026] like Figure 3As shown, the core 21 is installed circumferentially in the core mounting groove 221 by at least two countersunk screws. The countersunk screws are threadedly connected to the core fixing plate 22, which facilitates the installation of the core 21 into the core fixing plate 22 from the parting surface, achieving a quick change effect.

[0027] like Figure 2 As shown, the lower mold 2 also includes two equal-height shims 23, an ejector pin fixing plate 24, an ejector pin pad 25, and a lower mold fixing plate 26. The two equal-height shims 23, the ejector pin fixing plate 24, and the ejector pin pad 25 are all located between the core fixing plate 22 and the lower mold fixing plate 26. The ejector pin fixing plate 24 and the ejector pin pad 25 are both located between the two equal-height shims 23. The ejector pin fixing plate 24 is located above the ejector pin pad 25.

[0028] The bottom of the core fixing plate 22 is provided with a through hole that communicates with the core mounting groove 221. The core fixing plate 22 is designed with a hollow structure with through holes to avoid interference with the ejector pin. The top of the ejector pin fixing plate 24 is provided with an ejector pin, and the ejector pin passes through the core 21.

[0029] like Figure 5 As shown, the upper mold 1 includes an upper mold fixing plate 101 and a cavity fixing plate 102. The cavity fixing plate 102 is fixed to the bottom of the upper mold fixing plate 101, and a cavity 103 matching the core 21 is installed on the end of the cavity fixing plate 102 away from the upper mold fixing plate 101 by countersunk screws, which facilitates the disassembly and replacement of the cavity 103 from the parting surface. The side of the cavity 103 is provided with a protective ear-type gate.

[0030] The top of the upper mold 1 is connected to the external cylinder drive structure. The upper mold 1 is driven by the external cylinder drive structure to achieve mold closing and mold opening. The bottom of the lower mold fixing plate 26 has a through hole. The telescopic end of the external pusher cylinder passes through the through hole and is connected to the ejector pin pad 25. The ejector pin pad 25 is fixedly connected to the ejector pin fixing plate 24.

[0031] Working principle: The upper mold 1 is driven by an external cylinder to move the lower mold 2, so that the cavity 103 covers the outside of the core 21. Molten liquid is then injected into the cavity 103 through the ear-type gate. After cooling and forming, the upper mold 1 is driven by an external cylinder to move away from the lower mold 2, thereby separating the upper mold 1 from the lower mold 2. The ejector plate 25 and the ejector fixing plate 24 are driven by an external pusher cylinder to move synchronously, thereby driving the ejector to push the formed workpiece upward and separate it from the core 21, thus realizing the automatic demolding of the formed workpiece.

[0032] When it is necessary to replace the core 21 and the cavity 103, unscrew the countersunk screws on the core 21 and the cavity 103 from the parting surface. After the countersunk screws on the cavity 103 are removed, the cavity 103 will separate from the cavity fixing plate 102 under the action of gravity. After the countersunk screws on the core 21 are removed, the core 21 is released from its limit position. The spring returns to its original position, causing the inner rod and the pressure block 6 to press down on one end of the rotating part 4, thereby causing the other end of the rotating part 4 to tilt upward, causing the ejector part 3 to move upward and eject the core 21. The core fixing plate 22 facilitates the removal and replacement of the core 21. The new core 21 is placed into the core mounting slot 221 and fixed to the core fixing plate 22 with countersunk screws. Due to the limiting effect of the countersunk screws, the bottom of the core 21 is pressed against the ejector 3. The ejector 3 moves down and presses down one end of the rotating part 4, thereby causing the other end of the rotating part 4 to tilt upward and drive the pressure block 6 to compress the spring. At the same time, the inner rod retracts into the outer rod, thus preparing for the ejection when the core 21 is replaced next time.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick-change mold core type plastic mold frame for teaching, comprising an upper mold (1) and a lower mold (2), wherein the upper mold (1) covers the top of the lower mold (2), characterized in that: The lower mold (2) includes a core fixing plate (22) and a core (21) installed inside it. A core mounting groove (221) is provided at the middle position of the core fixing plate (22). An ejection mechanism is provided inside the core fixing plate (22) extending into the core mounting groove (221), and the ejection mechanism drives the core (21) to move vertically out of the core mounting groove (221).

2. The quick-change mold core plastic mold frame for teaching purposes according to claim 1, characterized in that: The ejection mechanism includes an ejector (3), a rotating component (4), a telescopic rod (5), and a pressure block (6). The ejector (3) penetrates the core fixing plate (22), and one end of the ejector (3) abuts against the rotating component (4). The telescopic rod (5) is fixed inside the core fixing plate (22), and the telescopic end of the telescopic rod (5) is connected to the pressure block (6). One end of the pressure block (6) away from the telescopic rod (5) abuts against the other end of the rotating component (4). The middle part of the rotating component (4) is rotatably connected to the core fixing plate (22).

3. A quick-change mold core plastic mold frame for teaching purposes according to claim 2, characterized in that: The telescopic rod (5) includes an inner rod and an outer rod. The outer rod is sleeved outside the inner rod. A spring is sleeved on one end of the inner rod that extends out of the outer rod, and the spring is located between the pressure block (6) and the outer rod.

4. A quick-change mold core plastic mold frame for teaching purposes according to claim 2, characterized in that: The core (21) is mounted circumferentially in the core mounting groove (221) by at least two countersunk screws.

5. A quick-change mold core plastic mold frame for teaching purposes according to claim 1, characterized in that: The lower mold (2) also includes two equal-height pads (23), an ejector pin fixing plate (24), an ejector pin pad (25), and a lower mold fixing plate (26). The two equal-height pads (23), the ejector pin fixing plate (24), and the ejector pin pad (25) are all located between the core fixing plate (22) and the lower mold fixing plate (26). The ejector pin fixing plate (24) and the ejector pin pad (25) are both located between the two equal-height pads (23). The ejector pin fixing plate (24) is located above the ejector pin pad (25).

6. A quick-change mold core plastic mold frame for teaching purposes according to claim 5, characterized in that: The bottom of the core fixing plate (22) is provided with a through hole that communicates with the core mounting groove (221), and the top of the ejector pin fixing plate (24) is provided with an ejector pin that penetrates the core (21).

7. A quick-change mold core plastic mold frame for teaching purposes according to claim 1, characterized in that: The upper mold (1) includes an upper mold fixing plate (101) and a cavity fixing plate (102). The cavity fixing plate (102) is fixed to the bottom of the upper mold fixing plate (101), and a cavity (103) matching the core (21) is installed on the end of the cavity fixing plate (102) away from the upper mold fixing plate (101) by countersunk screws.

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