Funnel-shaped rubber extrusion device

Abstract

This utility model relates to the field of rubber extruder technology, specifically a funnel-shaped rubber extrusion device. The device includes a barrel for connecting to the rubber extruder hopper, a discharge head detachably connected to the end of the barrel, and a plunger head slidably connected inside the barrel. A mandrel is disposed inside the discharge head, and a funnel-shaped extrusion orifice is formed at the rear end of the mandrel. A conical head that mates with the inclined surface of the extrusion orifice is fixedly connected to the front end of the plunger head. The funnel-shaped mandrel design of this device improves the utilization rate of rubber in a single extrusion, reduces the amount of rubber remaining in the die head, and minimizes material loss and energy consumption caused by secondary extrusion. The device also features a high sealing strength between the discharge head and the barrel, preventing rubber residue from remaining in the gap between them. Furthermore, the device allows for the replacement of the central mandrel, enabling the processing of rubber of corresponding sizes according to different product dimensions.

Description

Technical Field

[0001] This utility model relates to the field of rubber extruder technology, specifically a funnel-shaped rubber extrusion device. Background Technology

[0002] Perfluoroelastomer (PFE) is a high-performance elastomer material with excellent high-temperature and corrosion resistance. It maintains good elasticity and sealing properties even under extreme temperature conditions, making it an indispensable material in semiconductor manufacturing processes. Furthermore, PFE exhibits excellent chemical resistance, resisting the attack of various strong acids, strong alkalis, and organic solvents, ensuring stability and safety during use.

[0003] Currently, perfluoroelastomer (PFE) preforms are produced using rubber extruders. The PFE is fed into the extruder's hopper, and high pressure between the die head and plunger extrudes the rubber into a cylindrical strip, facilitating subsequent vulcanization. However, existing rubber extruders have low primary extrusion utilization. The plunger head in these extruders has a flat front end, which doesn't fully align with the extrusion port after insertion, leaving a significant gap. This results in a large amount of residual rubber in the die head, approximately 20%. During secondary extrusion, the material's flowability and shape stability may be affected, leading to relatively poor product precision. Furthermore, secondary extrusion can cause material degradation due to shear forces and heat, further degrading material properties and increasing material loss. The large amount of residual PFE increases waste during secondary extrusion, raising production costs. Utility Model Content

[0004] To address the problems of the prior art, this invention provides a funnel-shaped rubber extrusion device that improves the utilization rate of rubber in a single extrusion, reduces the amount of rubber remaining in the die head, and minimizes material loss and energy consumption caused by secondary extrusion.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a funnel-shaped rubber extrusion device, comprising a barrel for connecting to the hopper of a rubber extruder, a discharge head detachably connected to the end of the barrel, and a plunger head slidably connected inside the barrel. The discharge head is provided with a mandrel inside, and a funnel-shaped extrusion port is opened at the rear end of the mandrel. The front end of the plunger head is fixedly connected to a conical head that cooperates with the inclined surface of the extrusion port.

[0006] The above structural design ensures parallel extrusion and avoids mutual interference, improves the utilization rate of rubber in the first extrusion, reduces the amount of rubber remaining in the die head, and reduces material loss and energy consumption caused by secondary extrusion.

[0007] Preferably, the core mold includes a front core mold embedded inside the discharge head, a middle core mold embedded on the front core mold, and a rear core mold engaged with the middle core mold. The extrusion port is opened on the rear core mold, the middle core mold has an opening communicating with the extrusion port, and the front core mold has an discharge port communicating with the opening.

[0008] The above structural design allows for the replacement of the central core mold according to different products, and the processing of rubber of corresponding sizes according to different product dimensions.

[0009] Preferably, a sealing ring is provided between the rear core mold and the barrel, a sealing groove matching the sealing ring is formed on the rear core mold, an O-ring is provided in the sealing groove, an annular groove matching the O-ring is formed on the front side of the sealing ring, and the rear end face of the sealing ring extends beyond the rear end face of the rear core mold.

[0010] With the above structural design, after the discharge head is installed on the barrel, it squeezes the sealing ring and O-ring, thereby ensuring the sealing strength between the discharge head and the barrel.

[0011] Preferably, the central core mold and the sealing ring are both made of high-temperature resistant non-metallic materials.

[0012] By adopting the above structural design, during the rubber extrusion process, the mutual wear between the central core mold and the plunger head, and between the plunger head and the rear core mold, can be avoided to prevent metal particles from contaminating the rubber.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The mandrel of this device adopts a funnel-shaped design, which improves the utilization rate of rubber in the first extrusion, reduces the amount of rubber remaining in the die head, and reduces material loss and energy consumption caused by secondary extrusion. The device has a high sealing strength between the discharge head and the barrel, which prevents rubber from remaining in the gap between the discharge head and the barrel. The device can replace the middle mandrel and can process rubber of corresponding sizes according to different product sizes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention when the barrel and the discharge head are not connected;

[0016] Figure 2 This is a schematic diagram of the structure of the present invention after the barrel and the discharge head are connected; Detailed Implementation

[0017] Please see Figure 1 , Figure 2This utility model provides a technical solution: a funnel-shaped rubber extrusion device, including a barrel 1 for connecting to the hopper of a rubber extruder, a discharge head 2 detachably connected to the end of the barrel 1, and a plunger head 3 slidably connected inside the barrel 1. A core mold 4 is provided inside the discharge head 2 and is embedded in the inner side wall of the discharge head 2. A funnel-shaped extrusion port 5 is opened at the rear end of the core mold 4. A conical head 31 is fixedly connected to the front end of the plunger head 3 and matches the inclined surface of the extrusion port 5. The inclination angle of the inclined surface of the conical head 31 is the same as the inclination angle of the inclined surface of the extrusion port 5.

[0018] To facilitate the connection of the discharge head 2 to the barrel 1, the flange of the discharge head 2 is connected to the barrel 1, and flange rings are fixedly connected to both the discharge head 2 and the outer wall of the barrel 1.

[0019] The core mold 4 includes a front core mold 41 embedded inside the discharge head 2, a middle core mold 42 embedded in the front core mold 41, and a rear core mold 43 engaged with the middle core mold 42. The extrusion port 5 is opened on the rear core mold 43. A slot is opened inside the discharge head 2. The front core mold 41, the middle core mold 42, and the rear core mold 43 are sequentially engaged into the slot of the discharge head 2. The front end of the middle core mold 42 passes through the front core mold 41, and the rear end of the middle core mold 42... The edges are stepped. The rear end of the central core mold 42 is fixedly connected to the first retaining ring 429 and the second retaining ring 428. The diameter of the first retaining ring 429 is different from that of the second retaining ring 428. The first retaining ring 429 is engaged with the front core mold 41. The rear end of the front core mold 41 has a first retaining groove that matches the first retaining ring 429. The second retaining ring 428 is engaged with the rear core mold 43. The front end of the rear core mold 43 has a second retaining groove that matches the second retaining ring 428.

[0020] The central core mold 42 has an opening 421 that communicates with the extrusion port 5, and the front core mold 41 has an outlet 411 that communicates with the opening 421. The extrusion port 5, the opening 421, and the outlet 411 are all on the same axis. The outlet 411 is a trumpet-shaped opening facing forward, and the rear end of the outlet 411 is connected to the front end of the central core mold 42. Multiple central core molds 42 are provided, and the diameter of the opening 421 of each central core mold 42 is different, so that the central core mold 42 can be replaced according to the product size.

[0021] In this embodiment, the rear end face of the rear core mold 43 is flush with the rear end face of the discharge head 2.

[0022] A sealing ring 6 is provided between the rear core mold 43 and the barrel 1. A sealing groove 61 matching the sealing ring 6 is provided on the rear core mold 43. An O-ring 62 is provided in the sealing groove 61. An annular groove matching the O-ring 62 is provided on the front side of the sealing ring 6. The rear end face of the sealing ring 6 extends beyond the rear end face of the rear core mold 43.

[0023] The central core mold 42 and the sealing ring 6 are both made of high-temperature resistant non-metallic material, and the central core mold 42 and the sealing ring 6 are both made of PI (polyimide).

[0024] When the conical head 31 moves forward to a predetermined position and stops, the distance between the conical head 31 and the inclined surface of the extrusion port 5 is about 1mm. This greatly reduces the amount of rubber residue in the gap between the plunger head 3 and the extrusion port 5, and avoids the conical head 31 and the extrusion port 5 from coming into contact with each other and causing wear.

[0025] Working principle: The operator first installs the front core mold 41, the middle core mold 42, and the rear core mold 43 sequentially from front to back. The operator first inserts the front core mold 41 into the inside of the discharge head 2, then inserts the middle core mold 42 onto the front core mold 41, and then inserts the rear core mold 43 onto the middle core mold 42. Next, an O-ring 62 is installed in the sealing groove 61 on the rear core mold 43, and a sealing ring 6 is installed on the O-ring 62. Finally, the operator connects the flange of the discharge head 2 to the barrel 1. After the operator feeds the rubber into the hopper, the rubber extruder is started. The plunger head 3 squeezes the rubber from the hopper into the funnel-shaped extrusion port 5, and then squeezes it into a cylindrical strip through the middle core mold 42. Finally, the conical head 31 moves forward to the limit position and stops. The distance between the beveled surfaces of the conical head 31 and the extrusion port 5 is about 1mm, which greatly reduces the amount of rubber residue in the gap between the conical head 31 and the extrusion port 5.

[0026] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the scope of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this utility model's implementation.

[0027] The present invention has been described above with reference to preferred embodiments, but the scope of protection of the present invention is not limited thereto. All technical solutions falling within the scope of the claims are within the scope of protection of the present invention. Various modifications can be made to the present invention, and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A funnel-shaped rubber extrusion device, comprising a barrel (1) for connecting a rubber extruder bin, a discharge head (2) detachably connected to the end of the barrel (1), and a plunger head (3) slidingly connected inside the barrel (1), characterized in that: The core mold (4) is internally provided with a funnel-shaped extrusion opening (5) at the rear end, and the front end of the plunger head (3) is fixedly connected with a conical head (31) matched with the slope of the extrusion opening (5).

2. A funnel-like rubber extrusion device according to claim 1, characterized in that: The core mold (4) comprises a front core mold (41) clamped in the inside of the discharge head (2), a middle core mold (42) clamped on the front core mold (41), and a rear core mold (43) clamped with the middle core mold (42), wherein the extrusion opening (5) is arranged on the rear core mold (43), the middle core mold (42) is provided with a through opening (421) communicated with the extrusion opening (5), and the front core mold (41) is provided with a discharge opening (411) communicated with the through opening (421).

3. A funnel-like rubber extrusion device according to claim 2, characterized in that: A sealing ring (6) is arranged between the rear core mold (43) and the barrel (1), the rear core mold (43) is provided with a sealing groove (61) matched with the sealing ring (6), the sealing groove (61) is provided with an O-ring (62), the front side of the sealing ring (6) is provided with a ring groove matched with the O-ring (62), and the rear end surface of the sealing ring (6) exceeds the rear end surface of the rear core mold (43).

4. A funnel-like rubber extrusion device according to claim 3, characterized in that: The middle core mold (42) and the sealing ring (6) are made of non-metallic materials with high temperature resistance.

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