Internal suction vacuumizing structure for connection ejector pin of BMC (bulk molding compound) mold and injection molding machine

Abstract

The utility model provides a BMC mold and injection molding machine connecting ejector pin internal suction vacuumizing structure which comprises a forming plate, a mounting plate is arranged at the rear end of the forming plate, a back plate is arranged at the rear end of the mounting plate, and transverse plates are fixedly connected to the top surfaces and the bottom surfaces of the forming plate, the mounting plate and the back plate. The injection mold has the advantages that during injection molding, an external air extractor and an air suction structure are respectively connected with the air extraction pipe and the air suction hole and are started, and air in the forming cavity enters the air collection box through the cavity of the hollow ejector pin and then flows out through the air extraction pipe and the air suction hole, so that a vacuum structure is formed in the forming cavity. Due to the fact that the interior of the forming cavity is of a vacuum structure, when injection molding slurry is injected into the forming cavity, gas cannot be wrapped in the slurry, and bubbles cannot be formed in a product. And gas does not exist on the outer side of the product, so that the surface of the product is smoother, the workload of selecting defective products by operators can be reduced, and the practicability is very high.

Description

Technical Field

[0001] The utility model relates to the technical field of BMC molds, in particular to a structure for internal suction and vacuum pumping of a thimble connecting a BMC mold and an injection molding machine. Background Art

[0002] BMC molds have excellent electrical insulation performance, mechanical strength and chemical resistance, and are an ideal choice for manufacturing high-performance plastic products. It can adapt to various different product shape and size requirements, from small parts to large structural parts, and can meet the needs of industrial production.

[0003] In the existing BMC molds, a forming cavity is provided for the product through a moving mold and a fixed mold, and thimbles are used to assist the product in demolding. However, when the existing molds are in use, due to the presence of gas in the forming cavity, pores may be formed in the product, affecting the injection time and the appearance of the product. For this reason, a structure for internal suction and vacuum pumping of a thimble connecting a BMC mold and an injection molding machine is proposed for improvement. Summary of the Utility Model

[0004] The purpose of the utility model aims to solve at least one of the technical defects.

[0005] For this reason, an object of the utility model is to propose a structure for internal suction and vacuum pumping of a thimble connecting a BMC mold and an injection molding machine to solve the problems mentioned in the background art and overcome the deficiencies existing in the prior art.

[0006] To achieve the above object, an embodiment of one aspect of the utility model provides a structure for internal suction and vacuum pumping of a thimble connecting a BMC mold and an injection molding machine, including a forming plate, an installation plate is arranged at the rear end of the forming plate, a back plate is arranged at the rear end of the installation plate, horizontal plates are fixedly connected to the top and bottom surfaces of the forming plate, the installation plate and the back plate, a forming cavity is opened on the front surface of the forming plate, a plurality of first thimble holes and a plurality of second thimble holes are arranged in the forming cavity, a plurality of hollow thimbles are arranged between the forming plate and the installation plate, a waterproof breathable membrane is arranged at the end of the hollow thimble, the cavity inside the hollow thimble is communicated with the internal space of a gas collecting box, a gas collecting box is arranged inside the installation plate, a connecting groove is opened on the back plate, an exhaust pipe is fixedly connected to the rear end of the gas collecting box, and an air suction hole is opened on the side surface of the installation plate.

[0007] Preferably, any of the above solutions, the forming plate, the installation plate and the back plate all adopt a rectangular structure.

[0008] Preferably, any of the above solutions, the cross-sectional dimensions of the forming plate, the installation plate and the back plate are the same, and the horizontal plates are fixedly connected to the forming plate, the installation plate and the back plate through bolts.

[0009] Adopting the above technical solution: The forming plate provides a platform for the forming cavity, enabling the injection molding material to cool and form within the forming cavity. The mounting plate provides a mounting space for structures such as hollow ejector pins and air collecting boxes. The back plate provides a platform for the connecting grooves. The cross plate is used to tie the forming plate, mounting plate, and back plate together to ensure their stability. The cross plate is fixedly connected to the forming plate, mounting plate, and back plate by bolts, facilitating disassembly when needed.

[0010] Preferably, according to any of the above solutions, a plurality of the first ejector pin holes and a plurality of the second ejector pin holes are uniformly arranged within the forming cavity.

[0011] Preferably, according to any of the above solutions, the hollow ejector pin is arranged within the second ejector pin hole, and a through hole communicating with the air suction hole is provided on the side surface of the air collecting box.

[0012] Adopting the above technical solution: The first ejector pin hole and the second ejector pin hole provide a moving space for the ejector pin, and the hollow ejector pin is inserted into the second ejector pin hole. The hollow ejector pin is used to push the formed product to move, enabling the product to be separated from the forming cavity. The hollow ejector pin adopts a hollow structure to provide a flow channel for air. The second ejector pin holes are uniformly arranged within the forming cavity, facilitating the uniform extraction of gas within the forming cavity. A waterproof and breathable membrane is provided at the end of the hollow ejector pin to block the injection molding slurry and prevent the slurry from entering the hollow ejector pin along with the gas.

[0013] Preferably, according to any of the above solutions, there are a plurality of the connecting grooves, which are uniformly arranged on the back plate.

[0014] Preferably, according to any of the above solutions, the suction pipe is arranged within the connecting groove, and there are a plurality of the air suction holes, which are uniformly arranged on the side surface of the mounting plate.

[0015] Adopting the above technical solution: The connecting groove is an installation space for the suction pipe, facilitating the connection between an external air extraction device and the suction pipe, so that the external air extraction device can extract the gas within the forming cavity through the suction pipe, air collecting box, and hollow ejector pin, forming a vacuum structure within the forming cavity. The air suction holes can also cooperate with external structures to suck air and assist the suction pipe in extracting air.

[0016] Compared with the prior art, the advantages and beneficial effects of the present utility model are as follows:

[0017] The BMC mold is connected to the ejector pin of the injection molding machine with an internal suction and vacuum structure. By setting up structures such as the second ejector pin hole, hollow ejector pin, air collection box, connection groove, and suction pipe, during the injection molding process, an external air extraction device and an air suction structure are respectively connected to the suction pipe and the air suction hole and started. The gas in the forming cavity enters the air collection box through the cavity of the hollow ejector pin, and then flows out through the suction pipe and the air suction hole, forming a vacuum structure in the forming cavity. Since the forming cavity is a vacuum structure, when the injection molding slurry is injected into it, no gas will be wrapped in the slurry, and no bubbles will be formed in the product. There is also no gas outside the product, and the surface of the product is smoother and flatter. Thus, the workload of workers selecting defective products can be reduced, and the practicability is very strong.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a schematic structural view of the first perspective of the present invention;

[0021] Figure 2 is a schematic structural view of the second perspective of the present invention;

[0022] Figure 3 is a schematic sectional view of the present invention.

[0023] In the figure: 1 - forming plate, 2 - mounting plate, 3 - back plate, 4 - cross plate, 5 - forming cavity, 6 - first ejector pin hole, 7 - second ejector pin hole, 8 - hollow ejector pin, 9 - air collection box, 10 - connection groove, 11 - suction pipe, 12 - air suction hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0025] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] As Figures 1 to 3 shown, the present utility model includes a forming plate 1. A mounting plate 2 is provided at the rear end of the forming plate 1. A back plate 3 is provided at the rear end of the mounting plate 2. Horizontal plates 4 are fixedly connected to the top and bottom surfaces of the forming plate 1, the mounting plate 2 and the back plate 3. A forming cavity 5 is formed on the front surface of the forming plate 1. A number of first ejector pin holes 6 and a number of second ejector pin holes 7 are provided in the forming cavity 5. A number of hollow ejector pins 8 are provided between the forming plate 1 and the mounting plate 2. A waterproof and breathable film is provided at the end of the hollow ejector pin 8. The cavity inside the hollow ejector pin 8 is communicated with the internal space of the air collecting box 9. An air collecting box 9 is provided inside the mounting plate 2. A connecting groove 10 is formed on the back plate 3. An exhaust pipe 11 is fixedly connected to the rear end of the air collecting box 9. An air suction hole 12 is formed on the side surface of the mounting plate 2.

[0027] Embodiment 1: The forming plate 1, the mounting plate 2 and the back plate 3 all adopt rectangular structures. The cross-sectional dimensions of the forming plate 1, the mounting plate 2 and the back plate 3 are the same. The horizontal plates 4 are fixedly connected to the forming plate 1, the mounting plate 2 and the back plate 3 by bolts. The forming plate 1 provides a platform for the forming cavity 5, enabling the injection molding material to be cooled and formed in the forming cavity 5. The mounting plate 2 provides an installation space for structures such as the hollow ejector pins 8 and the air collecting box 9. The back plate 3 provides a platform for the connecting groove 10. The horizontal plates 4 are used to tie the forming plate 1, the mounting plate 2 and the back plate 3 together to ensure the stability of the three. The horizontal plates 4 are fixedly connected to the forming plate 1, the mounting plate 2 and the back plate 3 by bolts, which is convenient for disassembly when needed.

[0028] Embodiment 2: A number of first ejector pin holes 6 and a number of second ejector pin holes 7 are uniformly arranged in the forming cavity 5. The hollow ejector pins 8 are arranged in the second ejector pin holes 7. A through hole communicating with the air suction hole 12 is formed on the side surface of the air collecting box 9. The first ejector pin holes 6 and the second ejector pin holes 7 provide a moving space for the ejector pins. The hollow ejector pins 8 are inserted into the second ejector pin holes 7. The hollow ejector pins 8 are used to push the formed product to move, so that the product can be separated from the forming cavity 5. The hollow ejector pins 8 adopt a hollow structure to provide a flow channel for air. The second ejector pin holes 7 are uniformly arranged in the forming cavity 5, which is convenient for the gas in the forming cavity 5 to be uniformly extracted. A waterproof and breathable film is provided at the end of the hollow ejector pins 8, which can block the injection molding slurry and prevent the slurry from entering the hollow ejector pins 8 along with the gas.

[0029] Embodiment 3: There are several connecting grooves 10 which are evenly arranged on the back plate 3. The air extraction pipe 11 is arranged in the connecting groove 10, and there are several air suction holes 12 which are evenly arranged on the side surface of the mounting plate 2. The connecting groove 10 serves as the installation space for the air extraction pipe 11, facilitating the connection between the external air extraction device and the air extraction pipe 11, so that the external air extraction device can extract the gas in the forming cavity 5 through the air extraction pipe 11, the air collecting box 9, and the hollow ejector pin 8, forming a vacuum structure in the forming cavity 5. The air suction holes 12 can also cooperate with the external structure to suck air, assisting the air extraction pipe 11 in extracting air.

[0030] The working principle of the present utility model is as follows:

[0031] S1. Connect the external air extraction device and the air suction structure to the air extraction pipe 11 and the air suction holes 12 respectively and start them;

[0032] S2. The gas in the forming cavity 5 enters the air collecting box 9 through the cavity of the hollow ejector pin 8, and then flows out through the air extraction pipe 11 and the air suction holes 12, forming a vacuum structure in the forming cavity 5;

[0033] S3. Start the injection molding machine to inject the slurry into the forming cavity 5. Since the forming cavity 5 is in a vacuum structure, no gas will be wrapped in the slurry when the injection molding slurry is injected into it, and no bubbles will be formed in the product. There is also no gas outside the product, and the surface of the product is smoother and flatter.

[0034] Compared with the prior art, the present utility model has the following beneficial effects compared with the prior art:

[0035] This BMC mold is connected with an internal suction and vacuum extraction structure of the ejector pin of the injection molding machine. By setting structures such as the second ejector pin hole 7, the hollow ejector pin 8, the air collecting box 9, the connecting groove 10, and the air extraction pipe 11, during the injection molding operation, the external air extraction device and the air suction structure are connected to the air extraction pipe 11 and the air suction holes 12 respectively and started. The gas in the forming cavity 5 enters the air collecting box 9 through the cavity of the hollow ejector pin 8, and then flows out through the air extraction pipe 11 and the air suction holes 12, forming a vacuum structure in the forming cavity 5. Since the forming cavity 5 is in a vacuum structure, no gas will be wrapped in the slurry when the injection molding slurry is injected into it, and no bubbles will be formed in the product. There is also no gas outside the product, and the surface of the product is smoother and flatter. Thus, the workload of the operators for selecting defective products can be reduced, and the practicability is very strong.

Claims

1. A BMC mold and an injection molding machine connected ejector internal suction vacuum structure, comprising a molding plate (1); characterized in that: A mounting plate (2) is provided at the rear end of the molding plate (1), a back plate (3) is provided at the rear end of the mounting plate (2), a cross plate (4) is fixedly connected to the top and bottom surfaces of the molding plate (1), the mounting plate (2) and the back plate (3), a molding cavity (5) is provided at the front of the molding plate (1), a plurality of first ejector holes (6) and a plurality of second ejector holes (7) are provided in the molding cavity (5), a plurality of hollow ejector pins (8) are provided between the molding plate (1) and the mounting plate (2), a waterproof breathable membrane is provided at the end of the hollow ejector pin (8), the cavity inside the hollow ejector pin (8) is connected to the internal space of the gas collecting box (9), a gas collecting box (9) is provided in the mounting plate (2), a connecting groove (10) is provided on the back plate (3), a gas extraction pipe (11) is fixedly connected to the rear end of the gas collecting box (9), and a suction hole (12) is provided on the side of the mounting plate (2).

2. A BMC mold and an injection molding machine connected ejector internal suction vacuum pumping structure as claimed in claim 1, characterized in that: The forming plate (1), the mounting plate (2) and the back plate (3) all have a rectangular structure.

3. A BMC mold and an injection molding machine connected to an ejector pin internal suction vacuum pumping structure as claimed in claim 2, characterized in that: The cross-sectional dimensions of the forming plate (1), the mounting plate (2) and the back plate (3) are the same, and the transverse plate (4) is fixedly connected to the forming plate (1), the mounting plate (2) and the back plate (3) by means of bolts.

4. A BMC mold and injection molding machine connected ejector internal suction vacuum structure as claimed in claim 3, characterized in that: A plurality of the first ejector pin holes (6) and a plurality of the second ejector pin holes (7) are evenly arranged in the forming cavity (5).

5. A BMC mold and an injection molding machine connected ejector internal suction vacuum pumping structure as claimed in claim 4, characterized in that: The hollow ejector pin (8) is arranged in the second ejector pin hole (7), and a through hole communicating with the air suction hole (12) is opened on the side of the air collecting box (9).

6. A BMC mold and injection molding machine connected ejector internal suction vacuum structure as claimed in claim 5, characterized in that: There are a plurality of connection grooves (10) which are evenly arranged on the back plate (3).

7. A BMC mold and injection molding machine connected ejector internal suction vacuum structure as claimed in claim 6, characterized in that: The air extraction pipe (11) is arranged in the connection groove (10), and there are a plurality of air suction holes (12) which are evenly arranged on the side of the mounting plate (2).

Images