Scrap-free precise injection mold

Abstract

The utility model provides a waste-free precise injection mold which comprises an upper mold assembly and a lower mold assembly, and the upper mold assembly comprises an upper mold base, an injection molding pipe, a temperature sensor, a flow velocity sensor, a pressure sensor and an electric heating wire; the injection molding pipe is installed in the upper mold base, the temperature sensor, the flow speed sensor and the pressure sensor are all installed on the upper portion of the outer side wall of the injection molding pipe, and the electric heating wire is installed on the lower portion of the outer side wall of the injection molding pipe. In the injection molding process, the injection molding temperature, the injection molding speed and the injection molding pressure are monitored through the temperature sensor, the flow speed sensor and the pressure sensor respectively, then monitored data are sent to the controller, and the controller adjusts injection molding parameters of the injection molding machine in real time according to the injection molding temperature, the injection molding speed and the injection molding pressure parameters. And therefore, the injection molding quality can be improved, the injection molding precision is guaranteed, and waste materials are reduced.

Description

Technical Field

[0001] The utility model relates to an injection mold, specifically a waste-free precision injection mold, belonging to the technical field of injection molds. Background Technique

[0002] An injection mold is a tool that injects molten plastic material into the mold and forms the required shape of the product through pressurization and cooling. It is one of the core equipment in the production of plastic products, and its quality and performance directly affect the production efficiency and product quality. A waste-free injection mold refers to a mold that, through optimizing the mold structure and injection process during the injection molding process, enables the molten plastic to completely fill the mold cavity and hardly generates or only generates a very small amount of waste after molding.

[0003] It is known that the Chinese publicly authorized utility model (publication number: CN214926568U) discloses a waste-free injection mold for plastic sofa feet. By installing heating wires inside the injection pipe and connecting the power supply of the heating wires during the next injection, the heating wires can heat the cooled injection plastic inside the injection pipe, facilitating the melting of the cooled injection plastic and re-injecting it into the mold, effectively avoiding the generation of waste and eliminating the need for waste recycling. Moreover, electric pushers are installed inside the installation grooves, and push plates are fixed at the front ends of the electric pushers. When the upper mold and the lower mold are separated after injection cooling, the power supply of the electric telescopic device is connected, and the electric telescopic device drives the push plates to push forward. By pushing with the push plates, it is convenient to push the injection parts inside the mold forward, enabling the rapid separation between the injection parts and the mold and reducing the product damage rate.

[0004] It avoids the generation of waste by heating the injection pipeline, but during the injection process, the fluidity and filling property of the plastic in the mold will affect the working accuracy of the waste-free injection mold, thereby leading to the generation of waste. Moreover, when the injection parts are pushed by the push plates, the injection parts are prone to damage when receiving the thrust. Therefore, a waste-free precision injection mold is proposed. Content of the Utility Model

[0005] In view of this, the utility model provides a waste-free precision injection mold to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0006] The technical solution of the embodiment of the utility model is realized as follows: A waste-free precision injection mold includes an upper mold assembly and a lower mold assembly. The upper mold assembly includes an upper mold base, an injection pipe, a temperature sensor, a flow rate sensor, a pressure sensor, and a heating wire.

[0007] The injection pipe is installed inside the upper mold base. The temperature sensor, the flow rate sensor, and the pressure sensor are all installed on the upper part of the outer side wall of the injection pipe, and the heating wire is installed on the lower part of the outer side wall of the injection pipe.

[0008] The lower die assembly includes a lower die base, a sliding sleeve, a sliding column, a lifting seat, four guide rods, springs, four guide grooves and an inflation tube;

[0009] The sliding sleeve is fixedly connected to the outer side wall of the lifting seat. The sliding columns are equidistantly and fixedly connected to the upper surface of the lifting seat. The tops of the four guide rods are symmetrically and fixedly connected to the lower surface of the lifting seat. The springs are sleeved on the outer side walls of the guide rods. The inflation tube is installed inside the lower die base. The four guide grooves are symmetrically formed in the inner bottom wall of the lower die base.

[0010] Further preferably, a cavity is provided inside the lower die base, and the lifting seat is slidably connected to the inner side wall of the lower die base through the sliding sleeve.

[0011] Further preferably, a die cavity is formed on the upper surface of the lower die base. A through groove is formed in the inner bottom wall of the die cavity. The sliding column is slidably connected to the inner side wall of the through groove. The upper surface of the sliding column is in the same plane as the inner bottom wall of the die cavity.

[0012] Further preferably, the top end of the spring abuts against the lower surface of the lifting seat, and the bottom end of the spring abuts against the inner bottom wall of the guide groove.

[0013] Further preferably, the inflation tube is located above the lifting seat. Two limiting blocks are symmetrically and fixedly connected to both sides of the inner wall of the lower die base. The lower surface of the limiting block abuts against the upper surface of the sliding sleeve.

[0014] Further preferably, a die core is installed on the lower surface of the upper die base. An injection hole is formed inside the die core. The injection hole communicates with an injection tube. A controller is installed on the upper surface of the upper die base.

[0015] Further preferably, four guide posts are symmetrically and fixedly connected to the lower surface of the upper die base. Four guide sleeves are symmetrically installed on the upper surface of the lower die base.

[0016] Further preferably, the guide posts are slidably connected to the inside of the guide sleeves. The lower surface of the upper die base abuts against the upper surface of the lower die base.

[0017] Due to the adoption of the above technical solutions in the embodiments of the present utility model, the following advantages are achieved:

[0018] First, during the injection molding process of the present utility model, the injection molding temperature, injection molding speed and injection molding pressure are respectively monitored by a temperature sensor, a flow rate sensor and a pressure sensor, and then the monitored data is sent to the controller. The controller adjusts the injection molding parameters of the injection molding machine in real time according to the injection molding temperature, injection molding speed and injection molding pressure parameters, so as to improve the injection molding quality, ensure the injection molding accuracy and reduce the generation of waste materials.

[0019] Second, after the injection molding of the present utility model is completed and cooled, the upper mold base and the lower mold base are separated. At this time, the air charging pipe inflates the lower mold base. As the pressure difference between the upper and lower parts of the lifting seat increases, the lifting seat moves downward along the guide rod. At the same time, the lifting seat drives the sliding column to move downward. When the sliding column disengages from the through groove, the gas in the lower mold base flows out through the through groove. The high-pressure gas flowing out blows the injection molded part upward from below the injection molded part, and thus the demolding of the injection molded part can be realized, solving the problem that the injection molded part is easily damaged during demolding in the prior art.

[0020] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present utility model will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a structural diagram of the present utility model;

[0023] Figure 2 It is a structural diagram of the injection molding pipe of the present utility model;

[0024] Figure 3 It is a structural diagram of the upper mold assembly of the present utility model;

[0025] Figure 4 It is a structural diagram of the lower mold assembly of the present utility model;

[0026] Figure 5 It is a structural diagram of the lifting seat of the present utility model;

[0027] Figure 6 It is a structural diagram of the lower mold base of the present utility model.

[0028] Reference numerals: 101, upper mold assembly; 11, upper mold base; 12, mold core; 13, guide post; 14, injection hole; 15, injection molding pipe; 16, temperature sensor; 17, flow rate sensor; 18, pressure sensor; 19, heating wire; 20, controller; 301, lower mold assembly; 31, lower mold base; 32, mold cavity; 33, through groove; 34, sliding sleeve; 35, sliding column; 36, lifting seat; 37, guide rod; 38, spring; 39, guide groove; 40, limit block; 41, air charging pipe; 42, guide sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In the following text, only some exemplary embodiments are briefly described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present utility model. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0030] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0031] As Figure 1-6 shown, the embodiments of the present utility model provide a waste-free precision injection mold, which includes an upper mold assembly 101 and a lower mold assembly 301. The upper mold assembly 101 includes an upper mold base 11, an injection pipe 15, a temperature sensor 16, a flow rate sensor 17, a pressure sensor 18, and a heating wire 19.

[0032] The injection pipe 15 is installed inside the upper mold base 11. The temperature sensor 16, the flow rate sensor 17, and the pressure sensor 18 are all installed on the upper part of the outer side wall of the injection pipe 15. The heating wire 19 is installed on the lower part of the outer side wall of the injection pipe 15.

[0033] The lower mold assembly 301 includes a lower mold base 31, a sliding sleeve 34, a sliding column 35, a lifting seat 36, four guide rods 37, a spring 38, four guide grooves 39, and an inflation pipe 41.

[0034] The sliding sleeve 34 is fixedly connected to the outer side wall of the lifting seat 36. The sliding columns 35 are equidistantly and fixedly connected to the upper surface of the lifting seat 36. The tops of the four guide rods 37 are symmetrically and fixedly connected to the lower surface of the lifting seat 36. The spring 38 is sleeved on the outer side wall of the guide rod 37. The inflation pipe 41 is installed inside the lower mold base 31. The four guide grooves 39 are symmetrically opened on the inner bottom wall of the lower mold base 31.

[0035] In one embodiment, a cavity is provided inside the lower mold base 31. The lifting seat 36 is slidably connected to the inner side wall of the lower mold base 31 through the sliding sleeve 34. Thus, when the lifting seat 36 slides, it can drive the sliding column 35 to move simultaneously.

[0036] In one embodiment, a mold cavity 32 is opened on the upper surface of the lower mold base 31. A through groove 33 is opened on the inner bottom wall of the mold cavity 32. The sliding column 35 is slidably connected to the inner side wall of the through groove 33. The upper surface of the sliding column 35 is in the same plane as the inner bottom wall of the mold cavity 32. The top end of the spring 38 abuts against the lower surface of the lifting seat 36, and the bottom end of the spring 38 abuts against the inner bottom wall of the guide groove 39. By pushing the lifting seat 36 with the spring 38, the lifting seat 36 drives the sliding column 35 to insert into the through groove 33, and thus the mold cavity 32 can be closed to carry out the injection work.

[0037] In one embodiment, the charging pipe 41 is located above the lifting seat 36. On both sides of the inner wall of the lower mold base 31, two limiting blocks 40 are symmetrically and fixedly connected. The lower surface of the limiting block 40 is attached to the upper surface of the sliding sleeve 34. The charging pipe 41 is connected to an external air pump. When the charging pipe 41 inflates the lower mold base 31, the lifting seat 36 drives the sliding column 35 to move downward. When the sliding column 35 disengages from the through groove 33, the gas in the lower mold base 31 flows out through the through groove 33, and the gas blows the injection molded part, thereby realizing the demolding of the injection molded part and avoiding damage to the injection molded part during demolding.

[0038] In one embodiment, a mold core 12 is installed on the lower surface of the upper mold base 11. An injection hole 14 is formed inside the mold core 12. The injection hole 14 is communicated with an injection pipe 15. A controller 20 is installed on the upper surface of the upper mold base 11. The electrical output end of the controller 20 is electrically connected to the electrical input ends of a temperature sensor 16, a flow rate sensor 17, a pressure sensor 18, and a heating wire 19 through relays respectively. The signal sending ends of the temperature sensor 16, the flow rate sensor 17, and the pressure sensor 18 are all connected to the signal receiving end of the controller 20;

[0039] The model of the controller 20 is: OHR-PR10, the model of the temperature sensor 16 is: pt100, the model of the flow rate sensor 17 is: GS I N-LZ-DNXXX, and the model of the pressure sensor 18 is: PCM3051-W-DP.

[0040] In one embodiment, four guide posts 13 are symmetrically and fixedly connected to the lower surface of the upper mold base 11. Four guide sleeves 42 are symmetrically installed on the upper surface of the lower mold base 31. The guide posts 13 are slidably connected inside the guide sleeves 42. The lower surface of the upper mold base 11 is attached to the upper surface of the lower mold base 31. Through the cooperation of the guide posts 13 and the guide sleeves 42, the mold closing action of the upper mold base 11 and the lower mold base 31 can be guided, improving the mold closing accuracy.

[0041] When the utility model works: the upper die base 11 and the lower die base 31 are respectively installed on an injection molding machine. The injection molding machine is used to control the upper die base 11 and the lower die base 31 to close the mold. After the mold is closed, plastic is injected into the mold cavity 32 through the injection pipe 15. During the process of injecting plastic, the injection temperature, injection speed and injection pressure are respectively monitored by the temperature sensor 16, the flow rate sensor 17 and the pressure sensor 18, and then the monitored data is sent to the controller 20. The controller 20 adjusts the injection parameters of the injection molding machine in real time according to the injection temperature, injection speed and injection pressure parameters. When the injection is completed and cooled, the upper die base 11 and the lower die base 31 are separated. At this time, the air charging pipe 41 fills the lower die base 31 with air. As the pressure difference between the upper and lower parts of the lifting seat 36 increases, the lifting seat 36 drives the sliding column 35 to move downward. When the sliding column 35 disengages from the through groove 33, the gas in the lower die base 31 flows out through the through groove 33, and the gas blows the injection molded part upward from the lower part of the injection molded part, so that the demolding of the injection molded part can be realized, and damage to the injection molded part during demolding can be avoided.

[0042] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of various changes or substitutions thereof, and these should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A waste-free precision injection mold, comprising an upper mold assembly (101) and a lower mold assembly (301), characterized in that: The upper die assembly (101) includes an upper die base (11), an injection pipe (15), a temperature sensor (16), a flow rate sensor (17), a pressure sensor (18), and a heating wire (19); The injection pipe (15) is installed inside the upper die base (11). The temperature sensor (16), the flow rate sensor (17), and the pressure sensor (18) are all installed on the upper part of the outer side wall of the injection pipe (15), and the heating wire (19) is installed on the lower part of the outer side wall of the injection pipe (15); The lower die assembly (301) includes a lower die base (31), a sliding sleeve (34), a sliding column (35), a lifting seat (36), four guide rods (37), a spring (38), four guide grooves (39), and an inflation pipe (41); The sliding sleeve (34) is fixedly connected to the outer side wall of the lifting seat (36). The sliding columns (35) are equidistantly and fixedly connected to the upper surface of the lifting seat (36). The tops of the four guide rods (37) are symmetrically and fixedly connected to the lower surface of the lifting seat (36). The spring (38) is sleeved on the outer side wall of the guide rod (37). The inflation pipe (41) is installed inside the lower die base (31), and the four guide grooves (39) are symmetrically formed on the inner bottom wall of the lower die base (31).

2. The waste-free precision injection mold according to claim 1, wherein: A cavity is provided inside the lower die base (31), and the lifting seat (36) is slidably connected to the inner side wall of the lower die base (31) through the sliding sleeve (34).

3. The waste-free precision injection mold according to claim 2, characterized in that: A mold cavity (32) is formed on the upper surface of the lower die base (31). A through groove (33) is formed on the inner bottom wall of the mold cavity (32). The sliding column (35) is slidably connected to the inner side wall of the through groove (33), and the upper surface of the sliding column (35) is coplanar with the inner bottom wall of the mold cavity (32).

4. The waste-free precision injection mold according to claim 2, characterized in that: The top end of the spring (38) abuts against the lower surface of the lifting seat (36), and the bottom end of the spring (38) abuts against the inner bottom wall of the guide groove (39).

5. The waste-free precision injection mold according to claim 4, characterized in that: The inflation pipe (41) is located above the lifting seat (36). Two limiting blocks (40) are symmetrically and fixedly connected to both sides of the inner wall of the lower die base (31), and the lower surface of the limiting block (40) abuts against the upper surface of the sliding sleeve (34).

6. The waste-free precision injection mold according to claim 1, characterized in that: A mold core (12) is installed on the lower surface of the upper die base (11). An injection hole (14) is formed inside the mold core (12). The injection hole (14) communicates with the injection pipe (15). A controller (20) is installed on the upper surface of the upper die base (11).

7. The waste-free precision injection mold according to claim 6, wherein: Four guide posts (13) are symmetrically and fixedly connected to the lower surface of the upper die base (11). Four guide sleeves (42) are symmetrically installed on the upper surface of the lower die base (31).

8. The waste-free precision injection mold according to claim 7, wherein: The guide posts (13) are slidably connected to the inside of the guide sleeves (42), and the lower surface of the upper die base (11) abuts against the upper surface of the lower die base (31).

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