Extrusion device for producing silicone rubber

Abstract

The utility model relates to rubber production technical field, and disclose a kind of extrusion device for silicone rubber production, including extrusion cylinder, and extrusion cylinder bottom surface is connected with extrusion die head, and extrusion cylinder top is provided with extrusion subassembly, and extrusion cylinder front end top surface is provided with feed pipe, and preheating subassembly is provided on feed pipe, and extrusion cylinder outer surface is provided with heat uniform annular plate, and heat uniform annular plate is evenly provided with three, and extrusion cylinder front side is provided with the temperature monitoring panel of control heat uniform annular plate.The utility model can carry out axial segmented temperature control to rubber in extrusion cylinder by setting multiple heat uniform annular plates and temperature monitoring panel, avoid local overheating or cooling, avoid bubble thus appearing in silicone rubber;By setting the extrusion subassembly of double screw rod, and using different pitch symmetrical screw rod, realize difference shear reinforced mixing effect, ensure rubber uniform dispersion;Extrusion die head is provided with heat preservation heat plate, can cooperate with heat uniform annular plate, ensure that the temperature change of silicone rubber in extrusion die head is stable.

Description

Technical Field

[0001] This utility model relates to the field of rubber production technology, specifically to an extrusion device for silicone rubber production. Background Technology

[0002] Silicone rubber is a special synthetic rubber whose molecular backbone is composed of alternating silicon and oxygen atoms, with organic groups attached to the side chains. This structure endows silicone rubber with unique properties, giving it excellent resistance to high and low temperatures. It maintains elasticity within a temperature range of -73℃ to 300℃, and maintains stable resistivity over a wide temperature and frequency range. This resistance to corona and arcing also makes it an ideal material for high-voltage insulators and cable accessories. Furthermore, silicone rubber has high air permeability and physiological inertness, thus finding wide application in medical devices and food-grade products.

[0003] The patent with publication number CN222178620U discloses a discharge device for an extruder used in rubber production. It includes a base, with a screw extrusion cylinder fixedly mounted on the top of the base. An extrusion head is located at one end of the screw extrusion cylinder. A fixing component and a labyrinth sealing structure are provided between the screw extrusion cylinder and the extrusion head. By setting the fixing component, during use, the extrusion head is fitted onto one end of the screw extrusion cylinder. Then, one end of a locking rod is locked onto the outside of one end of the extrusion head, with the locking block inserted into a slot. Then, one end of a movable lever is moved so that 1 / 5 of the lever's length pulls the locking rod. Under the action of a high-elasticity spring, the locking rod pulls the extrusion head, causing it to lock tightly against the screw extrusion cylinder. A fixing ring is then fitted onto the movable lever to fix it. During disassembly, the movable lever is pulled up to release the locking rod, allowing for quick assembly and disassembly of the extrusion head, improving the portability of extrusion head replacement.

[0004] While the above-mentioned device improves the portability of changing the extruder head, it still has the following shortcomings:

[0005] In the extrusion production of silicone rubber, the presence of air bubbles can significantly affect the quality and performance of the product. The causes of air bubble formation are varied, with temperature being a crucial factor. If the temperature is too low, the rubber compound will not vulcanize sufficiently, and the internal gas will not be able to escape. If the temperature is too high, the surface of the rubber compound will solidify rapidly, trapping the internal air and forming air bubbles. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides an extrusion device for silicone rubber production that avoids the formation of bubbles due to temperature changes.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an extrusion device for silicone rubber production, comprising an extrusion cylinder, an extrusion die connected to the bottom surface of the extrusion cylinder, an extrusion assembly provided at the top of the extrusion cylinder, a feed pipe provided at the top front surface of the extrusion cylinder, a preheating assembly provided on the feed pipe, a heat equalization annular plate provided on the outer surface of the extrusion cylinder, three heat equalization annular plates being evenly arranged, and a temperature monitoring panel for controlling the heat equalization annular plates being provided on the front side of the extrusion cylinder.

[0008] Furthermore, the extrusion assembly includes an extrusion motor. A differential gearbox is provided on the bottom surface of the extrusion motor and connected to two symmetrically arranged driven gears via a drive gear. The drive gear is located at the top of the extrusion cylinder. The bottom surfaces of the driven gears are respectively connected to screw one and screw two with different pitches. The ends of screw one and screw two are rotatably connected to a fixed ring, which is located at the end of the extrusion cylinder.

[0009] Furthermore, the preheating component includes a preheating plate wrapped around the lower end of the feed pipe. The preheating plate is connected to the temperature monitoring panel via a cable. Inclined feed plates are symmetrically arranged inside the feed pipe, with openings between the feed plates.

[0010] Furthermore, the feed plate is provided with a closable baffle at the opening, and a push rod extending beyond the top surface of the extrusion cylinder is provided at the front end of the baffle. The closing plate rotates around the axis of the extrusion cylinder under the push of the push rod. A push groove for the push rod to rotate is provided at the front end of the closing plate. A fixing buckle is provided at the push groove of the closing plate. The two ends of the fixing buckle span across the upper and lower parts of the push groove. The fixing buckle limits and fixes the push rod in the closed state.

[0011] Furthermore, shredding rods are symmetrically arranged inside the upper end of the feed pipe, and a shredding motor is connected to the bottom surface of the shredding rods through a drive shaft. The shredding motor is located outside the feed pipe.

[0012] Furthermore, a heat-insulating plate is provided on the outer surface of the extrusion die, and the heat-insulating plate is connected to the temperature monitoring panel via a cable.

[0013] Furthermore, the hollow part of the fixing ring is equipped with a removable filter screen, and the extrusion cylinder behind the fixing ring is equipped with an air pump on its top surface.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] By setting up multiple homogenizing annular plates and a temperature monitoring panel, the rubber inside the extrusion cylinder can be axially segmented for temperature control, avoiding local overheating or cooling and reducing abnormal vulcanization or surface defects caused by temperature fluctuations in silicone rubber. By using a twin-screw extrusion assembly with symmetrical screws of different pitches, differential shearing enhances the mixing effect, ensuring uniform rubber dispersion and eliminating air bubbles. Integrating a preheating plate outside the feed pipe ensures the raw material reaches a suitable temperature before entering the extrusion cylinder. With the cooperation of inclined baffles and push rods, the feed rate can be dynamically adjusted by controlling the opening size, preventing blockages or insufficient supply. A crushing rod breaks up agglomerated silicone rubber or premixes, preventing large particles from entering the extrusion cylinder and affecting extrusion quality, thus improving raw material uniformity. A heat-insulating homogenizing plate on the extrusion die, working in conjunction with the homogenizing annular plates, ensures stable temperature changes for the silicone rubber within the extrusion die. An exhaust pump, combined with a filter, removes volatile gases or residual air generated during mixing, reducing internal air bubbles in the silicone rubber and improving product density. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the entire utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the present invention after the outer shell has been partially cut open.

[0018] Figure 3 This is a three-dimensional structural diagram of the extrusion cylinder and outer component of this utility model;

[0019] Figure 4 This is a three-dimensional structural diagram of the extrusion component of this utility model after disassembly;

[0020] Figure 5 This is a three-dimensional structural diagram of the preheating component of this utility model after it has been cut open.

[0021] In the diagram: 1. Extrusion cylinder; 101. Feed pipe; 102. Fixing ring; 103. Push groove; 104. Fixing buckle; 105. Filter screen; 106. Air pump; 2. Extrusion die; 201. Insulating heat spreader plate; 3. Extrusion assembly; 301. Extrusion motor; 302. Differential gearbox; 303. Drive gear; 304. Driven gear; 305. Screw one; 306. Screw two; 4. Preheating assembly; 401. Preheating plate; 402. Feed plate; 403. Baffle; 404. Push rod; 5. Heat spreader ring plate; 6. Temperature monitoring panel; 7. Crushing rod; 8. Crushing motor. Detailed Implementation

[0022] 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.

[0023] like Figures 1 to 5 As shown, an extrusion device for producing silicone rubber includes an extrusion cylinder 1, with an extrusion die 2 connected to the bottom surface of the extrusion cylinder 1. The device is characterized in that an extrusion assembly 3 is provided at the top of the extrusion cylinder 1, a feed pipe 101 is provided on the top surface of the front end of the extrusion cylinder 1, a preheating assembly 4 is provided on the feed pipe 101, a heat equalization annular plate 5 is provided on the outer surface of the extrusion cylinder 1, three heat equalization annular plates 5 are evenly arranged, and a temperature monitoring panel 6 for controlling the heat equalization annular plate 5 is provided on the front side of the extrusion cylinder 1.

[0024] like Figure 1 As shown, the extrusion device for silicone rubber production in this utility model is structurally similar to existing extrusion devices. For example, patent CN222178620U discloses an extruder discharge device for rubber production. The main improvement of this utility model is that it can stabilize temperature changes and avoid the formation of bubbles. Figures 1 to 5 As shown, in this utility model, an extrusion device for silicone rubber production first preheats the homogenizing ring plate 5, the heat-insulating homogenizing plate 201, and the preheating plate 401 via the temperature monitoring panel 6 to ensure that the temperature of each part of the device is within a suitable range, thus completing the preparation work. Then, raw materials are added from the feed pipe 101. The rubber raw materials are separated into small particles by the crushing rod 7 and then fall onto the feed plate 402, where they are preheated by the preheating plate 401 to raise their temperature. Next, the opening and closing of the baffle 403 is controlled by the push rod 404 to send the preheated raw materials into the extrusion cylinder 1. The rubber is extruded and moved backward by the cooperation of the screw 1 305 and the screw 2 306. Then, the rubber passes through the filter screen 105 to filter impurities and stabilize the extrusion pressure, reducing air bubbles and extrusion fluctuations. Finally, the rubber is shaped by the extrusion die 2 and extruded from the output end of the extrusion die 2, completing the rubber extrusion process.

[0025] like Figure 2 and Figure 4 As shown, the extrusion assembly 3 includes an extrusion motor 301. A differential gearbox 302 is provided on the bottom surface of the extrusion motor 301 and is connected to two symmetrically arranged driven gears 304 through a drive gear 303. The drive gear 303 is located at the top of the extrusion cylinder 1. The bottom surfaces of the driven gears 304 are respectively connected to a screw 1 305 and a screw 2 306 with different pitches. The ends of the screw 1 305 and the screw 2 306 are rotatably connected to a fixed ring 102, which is located at the end of the extrusion cylinder 1.

[0026] Specifically, with the cooperation of the extrusion motor 301 and the differential gearbox 302, the extrusion motor 301 will drive two symmetrical driven gears 304 through the drive gear 303, and the screw on the driven gear 304 will rotate to extrude the rubber; at the same time, the screws 305 and 306 with different pitches can enhance the mixing effect through differential shearing, ensuring the uniform dispersion of silicone rubber.

[0027] like Figure 2 and Figure 5 As shown, the preheating component 4 includes a preheating plate 401 wrapped around the lower end of the feed pipe 101. The preheating plate 401 is connected to the temperature monitoring panel 6 via a cable. Inclined feed plates 402 are symmetrically arranged inside the feed pipe 101, and openings for feeding are left between the feed plates 402.

[0028] like Figure 2 and Figure 5 As shown, the feed plate 402 is provided with a closable baffle 403 at the opening. The front end of the baffle 403 is provided with a push rod 404 extending beyond the top surface of the extrusion cylinder 1. The baffle 403 rotates around the axis of the extrusion cylinder 1 under the push of the push rod 404. The front end of the extrusion cylinder 1 is provided with a push groove 103 for the push rod 404 to rotate. The top of the extrusion cylinder 1 is provided with a fixing buckle 104 at the push groove 103. The two ends of the fixing buckle 104 span across the upper and lower parts of the push groove 103. The fixing buckle 104 limits and fixes the push rod 404 in the closed state.

[0029] Specifically, the preheating plate 401 wrapped around the lower end of the feed pipe 101 ensures that the raw material reaches a suitable temperature before entering the extrusion cylinder 1, reducing extrusion resistance caused by cold material. At the same time, with the cooperation of the inclined feed plate 402 and the baffle 403, the opening size can be controlled by pulling the push rod 404 to achieve dynamic adjustment of the feeding rate, preventing blockage or insufficient supply. The fixing buckle 104 set at the push groove 103 ensures that the baffle 403 is in a stable closed state, avoiding accidental opening and closing due to vibration or pressure fluctuations, and improving the reliability of equipment operation.

[0030] like Figure 1 and Figure 2 As shown, 7 crushing rods are symmetrically arranged inside the upper end of the feed pipe 101. The bottom surface of the crushing rods 7 is connected to the crushing motor 8 through the drive shaft. The crushing motor 8 is located outside the feed pipe 101.

[0031] Specifically, by setting a crushing rod 7 on the feed pipe 101, the crushing rod 7 will break up the agglomerated silicone rubber or premix before the raw material enters the device, thereby preventing large particles from entering the extrusion cylinder 1 and improving the uniformity of the raw material.

[0032] like Figure 1 and Figure 3As shown, a heat-insulating and heat-spreading plate 201 is provided on the outer surface of the extrusion die 2, and the heat-insulating and heat-spreading plate 201 is connected to the temperature monitoring panel 6 via a cable.

[0033] Specifically, under the precise control of the temperature monitoring panel 6, the heat insulation and heat distribution plate 201 will cooperate with the heat distribution ring plate 5 to perform axial segmented temperature control on the rubber in the extrusion cylinder 1, avoiding local overheating or cooling, and reducing abnormal vulcanization or surface defects of silicone rubber caused by temperature fluctuations.

[0034] like Figure 2 As shown, a removable filter screen 105 is provided in the hollow part of the fixing ring 102, and an air pump 106 is provided on the top surface of the extrusion cylinder 1 behind the fixing ring 102.

[0035] Specifically, by setting a removable filter screen 105, it is convenient for staff to clean. At the same time, the filter screen 105 can filter the passing rubber, allowing residual air bubbles in the rubber to escape. Subsequently, the volatile gases or residual air generated during the mixing process in these extrusion cylinders 1 will be sent out of the device by the exhaust pump 106 to reduce air bubbles inside the silicone rubber and improve the density of the product.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An extrusion device for producing silicone rubber, comprising an extrusion cylinder (1) having an extrusion die (2) connected to the bottom surface of the extrusion cylinder (1), characterized in that, The top of the extrusion cylinder (1) is provided with an extrusion assembly (3), the front end of the extrusion cylinder (1) is provided with a feed pipe (101), the feed pipe (101) is provided with a preheating assembly (4), the outer surface of the extrusion cylinder (1) is provided with a heat equalization ring plate (5), three heat equalization ring plates (5) are evenly arranged, and the front side of the extrusion cylinder (1) is provided with a temperature monitoring panel (6) for controlling the heat equalization ring plate (5).

2. The extrusion device for producing silicone rubber according to claim 1, characterized by The extrusion assembly (3) includes an extrusion motor (301), a differential gearbox (302) is provided on the bottom surface of the extrusion motor (301), and two symmetrically arranged driven gears (304) are connected through a drive gear (303). The drive gear (303) is located at the top of the extrusion cylinder (1). The bottom surface of the driven gear (304) is respectively connected to a screw one (305) and a screw two (306) with different pitches. The ends of the screw one (305) and the screw two (306) are rotatably connected to a fixing ring (102). The fixing ring (102) is located at the end of the extrusion cylinder (1).

3. The extrusion apparatus for silicone rubber production according to claim 2, characterized in that, The preheating component (4) includes a preheating plate (401) wrapped around the lower outer side of the feed pipe (101). The preheating plate (401) is connected to the temperature monitoring panel (6) via a cable. Inclined feed plates (402) are symmetrically arranged inside the feed pipe (101), and openings for feeding are left between the feed plates (402).

4. The extrusion apparatus for silicone rubber production according to claim 3, characterized in that, The feed plate (402) is provided with a closable baffle (403) at the opening. The front end of the baffle (403) is provided with a push rod (404) extending to the top surface of the extrusion cylinder (1). The baffle (403) rotates around the axis of the extrusion cylinder (1) under the push of the push rod (404). The front end of the extrusion cylinder (1) is provided with a push groove (103) for the push rod (404) to rotate. The top of the extrusion cylinder (1) is provided with a fixing buckle (104) at the push groove (103). The two ends of the fixing buckle (104) span across the upper and lower parts of the push groove (103). The fixing buckle (104) limits and fixes the push rod (404) in the closed state.

5. An extrusion apparatus for producing silicone rubber according to claim 4, characterized in that, The feed pipe (101) is symmetrically provided with crushing rods (7) inside the upper end. The bottom surface of the crushing rods (7) is connected to a crushing motor (8) through a transmission shaft. The crushing motor (8) is located outside the feed pipe (101).

6. An extrusion apparatus for producing silicone rubber according to claim 5, characterized in that, The outer surface of the extrusion die (2) is provided with a heat-insulating and heat-spreading plate (201), and the heat-insulating and heat-spreading plate (201) is connected to the temperature monitoring panel (6) via a cable.

7. An extrusion apparatus for producing silicone rubber according to claim 2, characterized in that, The hollow part of the fixing ring (102) is provided with a removable filter screen (105), and the extrusion cylinder (1) behind the fixing ring (102) is provided with an air pump (106) at the top surface.

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