A mold base demolding and ejection structure

Abstract

The utility model relates to a die technology field especially relates to a die blank stripping ejection structure, include: mounting bracket, set below mounting bracket's lower mould shell and set above mounting bracket's drive arrangement, the drive end of drive arrangement is provided with upper mould shell, the top wall middle part of upper mould shell is provided with the ejection groove, the ejection groove is annular groove, and inside is provided with ejection assembly, the ejection assembly includes ejection ring and a plurality of spout holes, the upper end of ejection ring is sealed and is slid in the inside of ejection groove, the bottom end section of ejection groove and ejection ring all are provided as trapezoidal, the inside of ejection ring is provided with gas guide ring cavity, a plurality of spout holes annularly open in the inside and outside of ejection ring bottom, and communicate with gas guide ring cavity, the upper mould shell is provided with gas guide assembly, the utility model forms the propelling force between mould and mould piece through the gas, completes the ejection effect to mould piece, and the gas will not cause the rigid extrusion to mould piece.

Description

Technical Field

[0001] This utility model relates to the field of demolding technology, and in particular to a mold blank demolding and ejection structure. Background Technology

[0002] During the demolding process, the mold blank ejection structure is an important component of the mold. Its core function is to separate and eject the cooled and solidified plastic product from the mold core or cavity at the end of the injection molding cycle.

[0003] Patent CN221736818U discloses a rapid demolding and ejection structure for a mold blank, including a base and a demolding unit. The demolding unit includes a lower mold, a demolding template, a top plate, a support frame, two sets of abutment components, multiple sets of top mold components, two sets of limiting components, a lifting component, and a pressing component. Each set of abutment components includes a spring, a round rod, a stop block, and a fixing block. The demolding template is located inside the lower mold. The multiple sets of top mold components are located between the demolding template and the top plate. The fixing block is fixedly connected to the top plate. The round rod passes through the fixing block, and one end of the round rod is fixedly connected to the demolding template. This structure can separate the plastic product from the demolding template, thereby preventing the plastic product from sticking to the demolding template and improving demolding efficiency.

[0004] The ejection structure described above is suitable for injection molding, but cannot be used in low-pressure casting equipment. Furthermore, during the ejection and demolding process, the molded part will be forcibly extruded, resulting in deformation of the molded part and reducing the yield of the molded part. Utility Model Content

[0005] The purpose of this invention is to solve the problem that in the existing technology, the molded part is subjected to hard extrusion during the ejection process, which leads to deformation of the mold part and reduces the yield of the mold part. Therefore, a mold blank ejection structure is proposed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A mold blank ejection structure includes: a mounting frame, a lower mold shell disposed below the mounting frame, and a driving device disposed above the mounting frame. The driving end of the driving device is provided with an upper mold shell, and an ejection groove is provided in the middle of the top wall of the upper mold shell. The ejection groove is an annular groove and an ejection assembly is provided inside it.

[0008] The ejection assembly includes an ejection ring and multiple ejection holes. The upper end of the ejection ring is sealed and slidably disposed inside the ejection groove. The bottom cross-sections of both the ejection groove and the ejection ring are trapezoidal. An air guide ring cavity is provided inside the ejection ring. The multiple ejection holes are annularly opened on the inner and outer sides of the bottom of the ejection ring and communicate with the air guide ring cavity.

[0009] An air guide assembly is provided above the upper mold shell, which is used to drive the ejector ring to move.

[0010] Preferably, a push plate is provided above the upper mold shell, and the push plate has sliding openings at its four corners, and the push plate is slidably mounted on the mounting frame.

[0011] Preferably, the space between the ejector groove and the ejector ring is configured as an air guiding space, an air guiding port communicating with the air guiding assembly is provided above the air guiding space, and two air inlets communicating with the air guiding space are provided above the air guiding ring cavity.

[0012] Preferably, a control valve is provided inside the air inlet, which is used to control the gas entering the air guide ring cavity.

[0013] Preferably, the air guiding assembly includes a connecting pipe, a control module, and an external connecting pipe. The connecting pipe is fixedly connected to the air guiding port, the control module is fixedly connected to the upper end of the connecting pipe, and the external connecting pipe is fixedly connected above the control module.

[0014] Preferably, the area of ​​one end of the plurality of ejector holes near the air guide ring cavity is larger than the area of ​​the other end, and the ejector holes are inclined downward.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] The annular ejection ring can push the mold part from multiple extrusion positions. After the extrusion ring pushes the mold part, creating a gas guiding space between the mold part and the upper mold shell, the gas guiding ring cavity is connected to the ejection groove. The gas cylinder exits the ring cavity and is ejected from multiple ejection holes, thereby guiding the gas into the gap between the mold part and the upper mold shell. Through the continuous introduction of gas, the volume of gas inside the gap is continuously increased, thereby strengthening the pushing force on the mold part and completing the ejection of the mold part. This utility model uses the introduction of gas to form a pushing force between the mold and the mold part to complete the ejection of the mold part, and the gas does not cause hard extrusion of the mold part, ensuring the integrity of the mold part. Attached Figure Description

[0017] Figure 1 This is a front view of the mold blank ejection structure proposed in this utility model;

[0018] Figure 2 This is a schematic diagram of the bottom surface structure of a mold blank ejection structure proposed in this utility model;

[0019] Figure 3 This is a schematic diagram of the upper mold shell structure of a mold blank ejection structure proposed in this utility model;

[0020] Figure 4This is a schematic diagram of the ejection assembly structure of a mold blank demolding and ejection structure proposed in this utility model;

[0021] Figure 5 This is a schematic diagram of the internal cross-sectional structure of the upper mold shell of the mold blank ejection structure proposed in this utility model;

[0022] Figure 6 This is a schematic diagram of the air vent structure of the mold blank ejection structure proposed in this utility model.

[0023] In the diagram: 1. Mounting bracket; 2. Lower mold shell; 3. Drive unit; 4. Upper mold shell; 5. Ejection assembly; 51. Ejection ring; 52. Spray hole; 6. Air guide assembly; 61. Connecting pipe; 62. Control module; 63. External pipe; 7. Push plate; 8. Air guide port; 9. Control valve. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] The terms used in this utility model, such as "upper", "lower", "left", "right", "middle" and "one", are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0026] Reference Figures 1-6 A mold blank ejection structure includes: a mounting frame 1, a lower mold shell 2 disposed below the mounting frame 1, and a driving device 3 disposed above the mounting frame 1. The driving end of the driving device 3 is provided with an upper mold shell 4. An ejection groove is provided in the middle of the top wall of the upper mold shell 4. The ejection groove is an annular groove and an ejection assembly 5 is provided inside it.

[0027] The ejection assembly 5 includes an ejection ring 51 and a plurality of ejection holes 52. The upper end of the ejection ring 51 is sealed and slidably disposed inside the ejection groove. The bottom cross-section of both the ejection groove and the ejection ring 51 is trapezoidal. An air guide ring cavity is provided inside the ejection ring 51. The plurality of ejection holes 52 are annularly opened on the inner and outer sides of the bottom of the ejection ring 51 and communicate with the air guide ring cavity.

[0028] An air guide assembly 6 is provided above the upper mold shell 4, and the air guide assembly 6 is used to drive the ejector ring 51 to move.

[0029] In the embodiments applying the above technical solution, after the low-pressure casting is completed, the mold part moves upward with the upper mold shell 4. It is necessary to eject the casting from the upper mold shell 4. Gas is introduced into the ejection groove through the gas guiding component 6. The gas guiding ring cavity is sealed. The gas first enters the ejection groove. As the gas accumulates in the ejection groove, the pressure inside the ejection groove increases, which squeezes the ejection ring 51, causing the ejection ring 51 to slide out from the ejection groove. The annular ejection ring 51 can squeeze and push the mold part from multiple squeezing positions. After the squeezing ring has pushed the mold part, and there is a gas guiding space between the mold part and the upper mold shell 4, the gas guiding ring cavity is connected to the ejection groove. The gas cylinder exits the ring cavity and is ejected from multiple ejection holes 52, thereby introducing the gas into the gap between the mold part and the upper mold shell 4. Through the continuous introduction of gas, the volume of gas in the gap is continuously increased, thereby strengthening the pushing force on the mold part and completing the ejection of the mold part.

[0030] This invention uses gas to create a pushing force between the mold and the mold part, thereby ejecting the mold part without causing hard compression of the mold part, thus ensuring the integrity of the mold part.

[0031] The preferred technical solution in this embodiment is:

[0032] Reference Figure 1-2 A push plate 7 is provided above the upper mold shell 4. The push plate 7 has sliding openings at its four corners and is slidably mounted on the mounting frame 1.

[0033] The push plate 7 can bear the weight of the upper mold shell 4, ensuring that the mold moves upward with the upper mold shell 4, and at the same time, the push plate 7 is limited and pushed through multiple sliding ports.

[0034] Reference Figure 4-5 The space between the ejector groove and the ejector ring 51 is set as an air guide space. An air guide port 8 communicating with the air guide assembly 6 is provided above the air guide space. Two air inlets communicating with the air guide space are provided above the air guide ring cavity.

[0035] The air inlet is equipped with a control valve 9, which is used to control the gas entering the air guide ring cavity.

[0036] The air guiding assembly 6 includes a connecting pipe 61, a control module 62, and an external pipe 63. The connecting pipe 61 is fixedly connected to the air guiding port 8, the control module 62 is fixedly connected to the upper end of the connecting pipe 61, and the external pipe 63 is fixedly connected above the control module 62.

[0037] The opening and closing of the air inlet is controlled by two control valves 9. When the ejector ring 51 needs to be ejected, the control valve 9 closes, sealing the air inlet and allowing all the gas introduced by the air guide assembly 6 to enter the air guide space. The continuously increasing pressure inside the air guide space squeezes and ejects the ejector ring 51. After the ejector ring 51 is ejected, the control valve 9 opens, connecting the air inlet with the air guide ring cavity. The gas enters the air guide ring cavity and is ejected through multiple side nozzles. This allows the gas to be quickly and evenly introduced into the gap between the casting and the upper mold shell 4, ensuring that the extrusion force at different locations is similar and preventing tearing between the casting and the upper mold shell 4 due to different extrusion forces in different directions.

[0038] Since different molds have different temperatures after casting, in order to ensure that the molds will not be deformed due to their high temperature during demolding, cold air of different low temperatures can be introduced through the external pipe 63. The opening and closing of the valves inside the control module 62 are controlled to introduce the gas inside the external pipe 63 into the connecting pipe 61 to complete the ejection of the casting.

[0039] Reference Figure 5-6 The area of ​​one end of the plurality of ejector holes 52 near the air guide ring cavity is larger than the area of ​​the other end, and the ejector holes 52 are inclined downward.

[0040] The area of ​​the air inlet is larger than that of the air outlet, which ensures that the ejected gas will generate a certain impact force and quickly diffuse into the gap between the mold part and the upper mold shell 4, thereby improving the efficiency of ejection and demolding.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A blank stripper-ejection structure comprising: The mounting bracket (1), the lower mold shell (2) disposed below the mounting bracket (1) and the driving device (3) disposed above the mounting bracket (1) are characterized in that the driving end of the driving device (3) is provided with an upper mold shell (4), and the upper mold shell (4) is provided with an ejection groove in the middle of the top wall, the ejection groove being an annular groove, and an ejection assembly (5) is provided inside it. The ejection assembly (5) includes an ejection ring (51) and multiple ejection holes (52). The upper end of the ejection ring (51) is sealed and slidably disposed inside the ejection groove. The bottom cross-section of the ejection groove and the ejection ring (51) is both set as trapezoidal. The ejection ring (51) is provided with a gas guide ring cavity inside. The multiple ejection holes (52) are annularly opened on the inner and outer sides of the bottom of the ejection ring (51) and communicate with the gas guide ring cavity. An air guide assembly (6) is provided above the upper mold shell (4), and the air guide assembly (6) is used to drive the ejector ring (51) to move.

2. A blank stripper-ejection structure according to claim 1, characterized in that A push plate (7) is provided above the upper mold shell (4). The push plate (7) has sliding openings at its four corners and is slidably mounted on the mounting frame (1).

3. A blank stripper-ejection structure according to claim 1, wherein The space between the ejector groove and the ejector ring (51) is set as an air guide space. An air guide port (8) communicating with the air guide assembly (6) is provided above the air guide space. Two air inlets communicating with the air guide space are provided above the air guide ring cavity.

4. A blank stripper-ejection structure according to claim 3, wherein The air inlet is equipped with a control valve (9), which is used to control the gas entering the air guide ring cavity.

5. A blank stripper-ejection structure according to claim 3, wherein The air guiding assembly (6) includes a connecting pipe (61), a control module (62), and an external pipe (63). The connecting pipe (61) is fixedly connected to the air guiding port (8), the control module (62) is fixedly connected to the upper end of the connecting pipe (61), and the external pipe (63) is fixedly connected above the control module (62).

6. The mold blank ejection structure according to claim 1, characterized in that, The area of ​​one end of the plurality of ejector holes (52) near the air guide ring cavity is larger than the area of ​​the other end, and the ejector holes (52) are inclined downward.

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