A rubber injection device and rubber injection machine with injection and pressure maintaining separated

Abstract

The utility model discloses a kind of injection and pressure maintaining separation type rubber injection device and rubber injection machine, including the plasticizing module for plasticizing rubber and the injection module for injecting rubber into mould, also include independent booster module;The plasticizing module injects the rubber after plasticizing into the injection module, the injection module is configured to be injected with first pressure, the booster module is configured to be filled in mould cavity after, the second pressure higher than the first pressure is applied to the rubber in mould and pressure maintaining is carried out.The injection and pressure maintaining separation type rubber injection device and rubber injection machine provided by the utility model adopt low-pressure injection and high-pressure pressure maintaining separation type structure, significantly save the material of injection device and reduce structural design strength;Moreover, since booster plunger area is small, pressure maintaining precision is more accurate, more easily controlled.

Description

Technical Field

[0001] This utility model relates to the technical field of rubber injection machines, specifically a rubber injection device and a rubber injection machine with separate injection and holding pressure. Background Technology

[0002] Currently, the market demand for high-volume (over 50,000cc) high-pressure (injection pressure greater than 180 MPa) rubber injection molding is increasing. Traditional injection structures, to meet high-pressure requirements, need to increase the area ratio of the injection cylinder to the plunger, leading to larger dimensions in the cylinder inner diameter, plunger diameter, and barrel wall thickness, resulting in material waste, high energy consumption, and large oil usage. However, during injection, the injection resistance is low when the mold is not fully filled with rubber, requiring only lower pressure to complete the injection. Existing technologies, however, use high-pressure injection throughout, resulting in low efficiency and high cost.

[0003] Therefore, the aforementioned technical problems need to be solved. Utility Model Content

[0004] This utility model addresses the above-mentioned technical problems by providing a rubber injection device and a rubber injection machine with separate injection and holding pressure. It adopts a structure that separates low-pressure injection and high-pressure holding pressure, which significantly saves materials for the injection device and reduces the structural design strength. Moreover, due to the small area of ​​the pressure booster plunger, the pressure holding accuracy is more precise and easier to control.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A rubber injection device with separate injection and holding pressure, comprising a plasticizing module for plasticizing rubber material and an injection module for injecting the rubber material into a mold, characterized in that it further comprises an independent pressure boosting module; the plasticizing module injects the plasticized rubber material into the injection module, the injection module is configured to inject at a first pressure, and the pressure boosting module is configured to apply a second pressure higher than the first pressure to the rubber material in the mold after the mold cavity is filled for holding pressure.

[0007] This injection and holding pressure separation rubber injection unit adopts a low-pressure injection and high-pressure holding pressure separation structure. When using an injection cylinder, compared with a conventional high-pressure injection unit, under the same injection volume and rubber pressure, the inner diameter of the injection cylinder is smaller, and the corresponding wall thickness is also smaller; the power of the oil supply motor is also reduced. Therefore, it significantly saves materials for the injection unit, reduces structural design strength, and saves energy. Moreover, because the pressure boosting area of ​​the high-pressure holding and boosting module is small, the pressure holding accuracy is more precise and easier to control, thus improving product quality.

[0008] A further optimized solution includes an injection module comprising an injection cylinder and an injection plunger. The area ratio of the piston in the injection cylinder to the injection plunger is configured to generate the first pressure. By adjusting the area ratio of the piston in the injection cylinder to the injection plunger, the first pressure, i.e., the injection pressure, is accurately generated.

[0009] In a further optimized scheme, the booster module includes a booster cylinder and a booster plunger, wherein the area ratio of the piston of the booster cylinder to the booster plunger is configured to generate the second pressure;

[0010] The area ratio of the piston to the booster plunger in the booster cylinder is greater than the area ratio of the piston to the injection plunger in the injection cylinder.

[0011] By adjusting the area ratio of the piston to the booster plunger in the booster cylinder, the second pressure, i.e. the holding pressure, can be accurately generated; it is easy to make the second pressure greater than the first pressure.

[0012] A further optimized solution includes a central connector, on which the plasticizing module, injection module, and pressurization module are respectively connected. By setting up the central connector to link the plasticizing module, injection module, and pressurization module into a single unit, they can easily achieve orderly and coordinated operation.

[0013] In a further optimized design, the central connecting body is equipped with a nozzle assembly that docks with the mold;

[0014] The centerline of the nozzle assembly is arranged at 90° with the centerline of the injection module, the plasticizing module and the injection module are coaxially arranged, and the nozzle assembly and the pressurizing module are located on the same centerline.

[0015] The plasticizing module, injection module, nozzle assembly, and pressurization module are rationally arranged on the central connector, which facilitates installation and use and makes the structure more compact.

[0016] To further optimize the design, a check valve is installed at the connection between the plasticizing module and the central connector. This check valve prevents the rubber compound from flowing back into the plasticizing module during the injection and holding pressure stages. The check valve facilitates functional switching between the plasticizing module, injection module, and pressurization module, enabling each module to perform its function independently.

[0017] The plasticizing module is further optimized to include a plasticizing connection flange, a plasticizing barrel, a plasticizing screw, and a plasticizing drive assembly.

[0018] The plasticizing connecting flange is disposed at one end of the plasticizing cylinder, and the plasticizing connecting flange is connected to the central connecting body;

[0019] The plasticizing cylinder is equipped with a glue inlet for inputting the glue;

[0020] The plasticizing screw is located inside the plasticizing barrel, and its end is connected to the plasticizing drive assembly;

[0021] The plasticizing drive assembly rotates, causing the plasticizing screw to rotate inside the plasticizing barrel, plasticizing the rubber material input from the inlet and injecting it into the injection module.

[0022] The solution is further optimized so that the injection module includes an injection cylinder, an injection plunger, an injection barrel, and an injection connection flange.

[0023] The piston rod of the injection cylinder is connected to the injection plunger, and the injection plunger is located inside the injection barrel;

[0024] One end of the injection cylinder is connected to the cylinder body of the injection cylinder, and the other end is provided with the injection connection flange, which is connected to the central connecting body through the injection connection flange;

[0025] The plasticizing module injects the plasticized rubber material into the injection cylinder;

[0026] The action of the injection cylinder drives the injection plunger to move back and forth inside the injection barrel, injecting the rubber material inside the injection barrel into the mold.

[0027] The optimized design further includes a booster cylinder, a booster connecting rod, a booster plunger, and a booster connecting flange.

[0028] The piston rod of the booster cylinder is connected to the booster plunger, the booster connecting rod connects the cylinder body of the booster cylinder to the booster connecting flange, and the booster connecting flange is connected to the central connecting body;

[0029] The booster cylinder drives its piston rod to extend outward, which in turn drives the booster plunger to act on the rubber material flow channel of the central connector, applying pressure to the rubber material inside and thus maintaining pressure on the rubber material in the mold.

[0030] A rubber injection machine includes any of the above-described injection and pressure-holding separated rubber injection devices.

[0031] Compared with the prior art, the injection and holding pressure separation type rubber injection device and rubber injection machine of this utility model have the following technical advantages:

[0032] 1. Energy saving and consumption reduction: The inner diameter of the injection cylinder is reduced, and the power of the hydraulic motor is reduced;

[0033] 2. Improved product quality: Precise pressure control during pressure holding results in increased product density;

[0034] 3. Lightweight structure: The dimensions of the barrel, cylinder and related connecting structures are optimized, and the amount of material used is reduced. Attached Figure Description

[0035] Figure 1 This is a cross-sectional view of a specific embodiment of the injection and pressure holding type rubber injection device of this utility model;

[0036] Figure 2 yes Figure 1 The left view;

[0037] Figure 3 yes Figure 1 Top view;

[0038] Figure 4 yes Figure 1 Enlarged view of part A in the middle.

[0039] In the diagram: Plasticizing module 10, plasticizing connecting flange 11, plasticizing barrel 12, inlet 12a, plasticizing screw 13, plasticizing drive assembly 14, bearing body 14a, connecting shaft 14b, hydraulic motor 14c, injection module 20, injection cylinder 21, injection plunger 22, injection barrel 23, injection connecting flange 24, injection connecting frame 25, injection connecting rod 26, pressurizing module 30, pressurizing cylinder 31, pressurizing connecting rod 32, pressurizing plunger 33, pressurizing connecting flange 34, retaining ring 35, central connecting body 40, nozzle assembly 50, nozzle body 51, nozzle 52, check valve 60. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0041] like Figures 1 to 4 As shown, this invention relates to a specific embodiment of a rubber injection device with separate injection and pressure holding mechanisms.

[0042] like Figure 1 As shown, the injection and holding pressure separated rubber injection device of this embodiment includes a plasticizing module 10 for plasticizing rubber material and an injection module 20 for injecting rubber material into a mold, and also includes an independent pressure boosting module 30; the plasticizing module 10 injects the plasticized rubber material into the injection module 20, the injection module 20 is configured to inject at a first pressure, and the pressure boosting module 30 is configured to apply a second pressure higher than the first pressure to the rubber material in the mold after the mold cavity is filled to hold the pressure.

[0043] This injection and holding pressure separation rubber injection unit adopts a low-pressure injection and high-pressure holding pressure separation structure. When using an injection cylinder, compared with a conventional high-pressure injection unit, under the same injection volume and rubber pressure, the inner diameter of the injection cylinder is smaller, and the corresponding wall thickness is also smaller; the power of the oil supply motor is also reduced. Therefore, it significantly saves materials for the injection unit, reduces structural design strength, and saves energy. Moreover, because the pressure boosting area of ​​the high-pressure holding and boosting module is small, the pressure holding accuracy is more precise and easier to control, thus improving product quality.

[0044] like Figure 1 and Figure 4 As shown, the injection and pressure-holding separated rubber injection device also includes a central connector 40, on which the plasticizing module 10, injection module 20, and pressure boosting module 30 are respectively connected. By setting the central connector 40 to connect the plasticizing module 10, injection module 20, and pressure boosting module 30 into one unit, they can easily achieve orderly and coordinated operation.

[0045] like Figure 1 and Figure 3 As shown, the central connecting body 40 is provided with a nozzle assembly 50 that docks with the mold; the center line of the nozzle assembly 50 is arranged at 90° with the center line of the injection module 20, the plasticizing module 10 and the injection module 20 are coaxially arranged, and the nozzle assembly 50 and the pressurizing module 30 are located on the same center line.

[0046] The plasticizing module 10, injection module 20, nozzle assembly 50 and pressurization module 30 are arranged on the central connector 40 in a reasonable manner, which facilitates installation and use and makes the structure more compact.

[0047] like Figure 1 and Figure 4 As shown, a check valve 60 is provided at the connection between the plasticizing module 10 and the central connecting body 40. The check valve 60 prevents the rubber material from flowing back into the plasticizing module 10 during the injection and holding pressure stages. The check valve 60 realizes the function switching between the plasticizing module 10, the injection module 20 and the pressurizing module 30, so that each module can complete its function independently.

[0048] like Figure 1 and Figure 2 As shown, the plasticizing module 10 includes a plasticizing connecting flange 11, a plasticizing barrel 12, a plasticizing screw 13, and a plasticizing drive assembly 14; the plasticizing connecting flange 11 is located at one end of the plasticizing barrel 12 and is connected to the central connecting body 40; the plasticizing barrel 12 is provided with a glue inlet 12a for inputting glue; the plasticizing screw 13 is located inside the plasticizing barrel 12, and its end is connected to the plasticizing drive assembly 14.

[0049] The plasticizing drive assembly 14 rotates, causing the plasticizing screw 13 to rotate inside the plasticizing barrel 12, which plasticizes the rubber material input from the inlet 12a and injects it into the injection module 20.

[0050] The plasticizing drive assembly 14 includes a bearing body 14a, a connecting shaft 14b, and a hydraulic motor 14c. One end of the plasticizing cylinder 12 is connected to the bearing body 14a, and one end of the bearing body 14a is connected to the hydraulic motor 14c. The connecting shaft 14b is supported by the bearing body 14a and connects the hydraulic motor 14c to the plasticizing screw 13. The hydraulic motor 14c drives the connecting shaft 14b and the plasticizing screw 13 to rotate. The rubber material enters through the inlet 12a, is squeezed by the rotating plasticizing screw 13, passes through the check valve 60, and reaches the injection module 20 via the central connector 40, thus achieving the plasticizing function.

[0051] like Figure 1 and Figure 2 As shown, the injection module 20 includes an injection cylinder 21, an injection plunger 22, an injection barrel 23, and an injection connecting flange 24; the piston rod of the injection cylinder 21 is connected to the injection plunger 22, and the injection plunger 22 is located inside the injection barrel 23; one end of the injection barrel 23 is connected to the cylinder body of the injection cylinder 21, and the other end is provided with the injection connecting flange 24, and is connected to the central connecting body 40 through the injection connecting flange 24; the plasticizing module 10 injects the plasticized rubber into the injection barrel 23.

[0052] The action of the injection cylinder 21 drives the injection plunger 22 to move back and forth in the injection barrel 23, and injects the rubber material in the injection barrel 23 into the mold.

[0053] like Figure 1 and Figure 2 As shown, in a further specific embodiment, the injection module 20 also includes an injection connecting frame 25 and an injection connecting rod 26. The piston rod end of the injection cylinder 21 is connected to the injection connecting rod 26, and the injection connecting rod 26 is connected to the injection plunger 22. The injection connecting frame 25 connects the cylinder body of the injection cylinder 21 and the end of the injection barrel 23.

[0054] The nozzle assembly 50 includes a nozzle body 51 and a nozzle 52. The nozzle 52 is connected to one end of the nozzle body 51 and is connected to the mold. The injection cylinder 21 drives the injection plunger 22 to move back and forth in the injection barrel 23 via the injection connecting rod 26, so that the rubber material entering the injection barrel 23 is injected into the mold through the central connecting body 40, the nozzle body 51 and the nozzle 52, thereby realizing the injection function.

[0055] like Figure 1 and Figure 3As shown, the booster module 30 includes a booster cylinder 31, a booster connecting rod 32, a booster plunger 33, and a booster connecting flange 34; the piston rod of the booster cylinder 31 is connected to the booster plunger 33, the booster connecting rod 32 connects the cylinder body of the booster cylinder 31 to the booster connecting flange 34, and the booster connecting flange 34 is connected to the central connecting body 40.

[0056] The pressure boosting module 30 also includes a retaining ring 35, through which the piston rod of the pressure boosting cylinder 31 is connected to the pressure boosting plunger 33. The pressure boosting cylinder 31 drives its piston rod to extend outward, thereby driving the pressure boosting plunger 33 to act on the material flow channel of the central connecting body 40, applying pressure to the material inside, and thus maintaining pressure on the material inside the mold.

[0057] like Figure 1 As shown, the area ratio of the piston of the injection cylinder 21 to the injection plunger 22 in the injection module 20 is configured to generate a first pressure. The first pressure, i.e., the injection pressure, is accurately generated by adjusting the area ratio of the piston of the injection cylinder 21 to the injection plunger 22.

[0058] like Figure 1 As shown, the area ratio of the piston to the pressure plunger 33 in the pressure boosting cylinder 31 of the pressure boosting module 30 is configured to generate a second pressure.

[0059] The area ratio of the piston to the booster plunger 33 in the booster cylinder 31 is greater than the area ratio of the piston to the injection plunger 22 in the injection cylinder 21.

[0060] The second pressure, i.e. the holding pressure, is accurately generated by adjusting the area ratio of the piston of the booster cylinder 31 to the booster plunger 33; it is easy to make the second pressure greater than the first pressure.

[0061] Specifically, the piston and injection plunger area ratio of injection cylinder 21 is 5:1. Under the hydraulic system pressure of 21MPa, an injection pressure of 110MPa is generated, which is responsible for injecting the rubber material into the mold. When the mold is full, the pressure boosting module 30, whose piston and pressure booster plunger area ratio of booster cylinder 31 is 10:1, increases the pressure of the rubber material in the mold cavity to a holding pressure of 210MPa, meeting the process requirements. In this way, the inner diameter of injection cylinder 21 and the design strength of injection barrel 23 only need to meet the design strength of 110MPa, which greatly saves energy and materials.

[0062] This utility model also discloses a rubber injection machine, including the above-mentioned injection and pressure holding separate rubber injection device.

[0063] This rubber injection device and rubber injection machine with separate injection and holding pressure features a structure that separates low-pressure injection and high-pressure holding pressure, significantly saving materials and reducing structural design strength. Moreover, due to the small area of ​​the pressure booster plunger, the holding pressure accuracy is more precise and easier to control.

[0064] In summary, as described in the specification and figures, this utility model has been manufactured into actual samples and subjected to multiple use tests. The test results demonstrate that this utility model achieves its intended purpose, and its practicality is beyond doubt. The embodiments described above are merely for illustrative purposes and are not intended to limit the scope of this utility model. Any equivalent embodiments made by those with common knowledge in the relevant technical field, utilizing the technical content disclosed in this utility model, without departing from the scope of the technical features and similar features disclosed in this utility model, are all within the protection scope of this utility model.

Claims

1. A rubber injection device with separate injection and holding pressure, comprising a plasticizing module (10) for plasticizing rubber material and an injection module (20) for injecting the rubber material into a mold, characterized in that, It also includes an independent pressure boosting module (30); the plasticizing module (10) injects the plasticized rubber into the injection module (20), the injection module (20) is configured to inject at a first pressure, and the pressure boosting module (30) is configured to apply a second pressure higher than the first pressure to the rubber in the mold after the mold cavity is filled to maintain pressure.

2. The injection and pressure holding separation type rubber injection device according to claim 1, characterized in that, The injection module (20) includes an injection cylinder (21) and an injection plunger (22), wherein the area ratio of the piston of the injection cylinder (21) to the area of ​​the injection plunger (22) is configured to generate the first pressure.

3. The injection and pressure-holding separated rubber injection device according to claim 2, characterized in that, The booster module (30) includes a booster cylinder (31) and a booster plunger (33), wherein the area ratio of the piston of the booster cylinder (31) to the area of ​​the booster plunger (33) is configured to generate the second pressure; The area ratio of the piston to the booster plunger (33) of the booster cylinder (31) is greater than the area ratio of the piston to the injection plunger (22) of the injection cylinder (21).

4. The injection and pressure-holding separated rubber injection device according to claim 1, characterized in that, It also includes a central connector (40), on which the plasticizing module (10), injection module (20) and pressurizing module (30) are respectively connected.

5. The injection and pressure holding separation type rubber injection device according to claim 4, characterized in that, The central connector (40) is provided with a nozzle assembly (50) that docks with the mold. The centerline of the nozzle assembly (50) is arranged at 90° with the centerline of the injection module (20), the plasticizing module (10) and the injection module (20) are coaxially arranged, and the nozzle assembly (50) and the pressurizing module (30) are located on the same centerline.

6. The injection and pressure holding separation type rubber injection device according to claim 4, characterized in that, A check valve (60) is provided at the connection between the plasticizing module (10) and the central connector (40). The check valve (60) prevents the rubber material from flowing back into the plasticizing module (10) during the injection and pressure holding stages.

7. The injection and holding pressure separation type rubber injection device according to claim 4, characterized in that, The plasticizing module (10) includes a plasticizing connection flange (11), a plasticizing barrel (12), a plasticizing screw (13), and a plasticizing drive assembly (14). The plasticizing connecting flange (11) is disposed at one end of the plasticizing cylinder (12), and the plasticizing connecting flange (11) is connected to the central connecting body (40); The plasticizing cylinder (12) is provided with a rubber inlet (12a) for inputting rubber material. The plasticizing screw (13) is located inside the plasticizing barrel (12), and its end is connected to the plasticizing drive assembly (14). The plasticizing drive assembly (14) rotates to drive the plasticizing screw (13) to rotate inside the plasticizing barrel (12), plasticizing the rubber material input from the inlet (12a) and injecting it into the injection module (20).

8. The injection and holding pressure separation type rubber injection device according to claim 4, characterized in that, The injection module (20) includes an injection cylinder (21), an injection plunger (22), an injection barrel (23), and an injection connection flange (24). The piston rod of the injection cylinder (21) is connected to the injection plunger (22), and the injection plunger (22) is located inside the injection barrel (23); One end of the injection cylinder (23) is connected to the cylinder body of the injection cylinder (21), and the other end is provided with the injection connection flange (24), which is connected to the central connector (40) through the injection connection flange (24). The plasticizing module (10) injects the plasticized rubber into the injection cylinder (23); The injection cylinder (21) moves the injection plunger (22) back and forth in the injection barrel (23) and injects the rubber material in the injection barrel (23) into the mold.

9. The injection and pressure holding separation type rubber injection device according to claim 4, characterized in that, The booster module (30) includes a booster cylinder (31), a booster connecting rod (32), a booster plunger (33), and a booster connecting flange (34). The piston rod of the booster cylinder (31) is connected to the booster plunger (33), the booster connecting rod (32) connects the cylinder body of the booster cylinder (31) to the booster connecting flange (34), and the booster connecting flange (34) is connected to the central connecting body (40); The booster cylinder (31) drives its piston rod to extend outward, which in turn drives the booster plunger (33) to act on the rubber material flow channel of the central connector (40) to apply pressure to the rubber material inside, thereby achieving pressure retention of the rubber material in the mold.

10. A rubber injection molding machine, characterized in that: Includes the injection and pressure holding separate rubber injection device as described in any one of claims 1 to 9.

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