Silicone rubber cable extruding and vulcanizing device

Abstract

The utility model provides a silicone rubber cable extruding and vulcanizing device, which comprises an extruding main machine, a vulcanizing box group, a cooling unit and a conveying line, and is characterized in that the extruding main machine is used for extruding and molding silicone rubber onto a wire core to obtain a silicone rubber wire; the vulcanization box group comprises at least one high-temperature vulcanization box and one low-temperature vulcanization box, and the high-temperature vulcanization box is used for performing high-temperature vulcanization on the silicone rubber wire at 700-800 DEG C; the cooling unit is used for cooling the silicone rubber wire subjected to high-temperature vulcanization; the conveying line is used for conveying the silicone rubber line to the cooling unit through the vulcanization box set. According to the utility model, through rapid high-temperature vulcanization at the temperature of 700-800 DEG C and active cooling after high-temperature vulcanization, the quality problems such as foaming and bulging in the vulcanization process are avoided, the product quality is improved, the production cost is reduced, and the production delivery time is met.

Description

Technical Field

[0001] The utility model relates to the technical field of cable processing equipment, in particular to a silicone rubber cable extrusion vulcanization device. Background Art

[0002] In the silicone rubber extrusion and vulcanization process of cables, organic peroxides are currently used as vulcanizing agents to mix with silicone rubber, and then the extruded silicone rubber containing the vulcanizing agent is subjected to high-temperature vulcanization. The conventional vulcanization method is that the extruded silicone rubber cores are sequentially placed into an online high-temperature oven for vulcanization (the temperature of the high-temperature oven is first increased and then decreased in sequence, forming a parabolic temperature curve, such as the temperature curve rising from 200°C to about 400°C and then slowly decreasing). During the vulcanization process, quality problems such as foaming, bulging, and empty tubes are prone to occur. The emergence of these problems seriously affects the continuous production of silicone rubber cables. The segmented and reworked processing methods increase the company's production costs and production delivery time. Utility Model Content

[0003] One purpose of the utility model is to solve the quality problems of blistering, bulging and the like occurring in the wire core during the vulcanization process, and to provide a silicone rubber cable extrusion vulcanization device.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] Silicone rubber cable extrusion vulcanization device, including:

[0006] Extrusion machine, used to extrude silicone rubber onto the wire core to obtain silicone rubber wire;

[0007] A vulcanization box group, comprising at least one high-temperature vulcanization box and one low-temperature vulcanization box, wherein the high-temperature vulcanization box is used to perform high-temperature vulcanization on the silicone rubber wire at 700°C to 800°C;

[0008] Cooling unit, used to cool the silicone rubber wire after high temperature vulcanization;

[0009] The conveyor line is used to transport the silicone rubber line to the cooling unit through the vulcanization box group.

[0010] Furthermore, the low-temperature vulcanization box is arranged between the high-temperature vulcanization box and the cooling unit, and the low-temperature vulcanization box is used to perform low-temperature vulcanization of the silicone rubber wire at 170° C. to 230° C.

[0011] Furthermore, the number of the high-temperature vulcanization boxes is two, and the low-temperature vulcanization box is arranged between the high-temperature vulcanization box away from the extrusion main machine and the cooling unit.

[0012] Furthermore, the cooling unit is a water cooling tank.

[0013] Furthermore, a pay-off rack and a front tractor are provided on the front side of the extruder main unit, and a take-up rack and a take-up tractor are provided on the rear side of the cooling unit.

[0014] Furthermore, the extrusion host is also connected to a vacuum unit, and the vacuum unit is used to perform a vacuum operation on the interior of the extrusion host.

[0015] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0016] In the present invention, rapid high-temperature vulcanization at 700°C to 800°C and active cooling after high-temperature vulcanization are performed to eliminate quality problems such as foaming and bulging during the vulcanization process, thereby improving product quality, reducing production costs and meeting production delivery dates. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of a conventional vulcanizing device in an embodiment of the present utility model.

[0018] Figure 2 This is a structural diagram of the vulcanizing device of the present utility model. DETAILED DESCRIPTION

[0019] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention is capable of various variations in different embodiments without departing from the scope of the present invention, and that the descriptions and illustrations herein are intended to be illustrative in nature and not to limit the present invention.

[0020] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0021] The reasons for the foaming and bulging of silicone rubber cables during the vulcanization process are as follows: the gas generated during the vulcanization of silicone rubber and the moisture in the core are vaporized and expanded by heat, and cannot be discharged through the vulcanized silicone rubber layer. Figure 1 As shown, a 10-section vulcanization box 100 is used, and the vulcanization temperature curve is from 200°C to about 400°C and then slowly decreased to about 200°C. This conventional vulcanization method is to gradually vulcanize from the outer layer to the inner layer by high-temperature baking in stages. During the vulcanization process, the strength of the outer vulcanized layer cannot withstand the pressure generated by the thermal expansion of the inner layer gas (the expansion coefficient of the internal gas is much greater than the expansion coefficient of the silicone rubber), so it is "expanded by the gas", resulting in problems such as foaming and bulging. Therefore, the following embodiments avoid foaming and bulging through innovations in the vulcanization process and vulcanization equipment.

[0022] The embodiment of the present invention also provides a silicone rubber cable extrusion vulcanization device, such as Figure 2 As shown, the vulcanization apparatus includes an extruder 2, which is used to extrude silicone rubber onto a wire core to produce silicone rubber wire. The extruder 2 is connected upstream to the pay-off frame and front tractor 1. The extruder is also connected to a vacuum unit, which acts on the interior of the extruder to evacuate the interior.

[0023] Downstream of the extruder is a vulcanization tank group 3, which includes a high-temperature vulcanization tank 31 for vulcanizing the silicone rubber cord at 700°C to 800°C. A low-temperature vulcanization tank 32 is located downstream of the high-temperature vulcanization tank 31, for vulcanizing the silicone rubber cord at 170°C to 230°C. This serves as a buffer between high-temperature vulcanization and cooling. The number of high-temperature vulcanization tanks is greater than that of low-temperature vulcanization tanks, meaning that high-temperature vulcanization takes longer. As shown in the figure, there are two high-temperature vulcanization tanks 31 and one low-temperature vulcanization tank 32.

[0024] Downstream of the low-temperature vulcanization chamber is a cooling unit, which actively cools the silicone rubber strands after both high-temperature and low-temperature vulcanization. As mentioned above, active cooling is the opposite of natural cooling. The cooling unit is preferably designed as a water-cooling tank 4, which actively cools the silicone rubber strands by providing cooling water.

[0025] The downstream of the cooling unit is designed as a wire take-up rack and a wire take-up traction machine 5, which are used to provide power for the movement of the wire core.

[0026] The vulcanizing device further includes a conveyor line (not shown) for providing a passage for conveying the silicone rubber wire to the cooling unit and the wire take-up rack via the high-temperature vulcanizing box and the low-temperature vulcanizing box. The conveyor line can be, for example, a track passing through the high-temperature vulcanizing box and the low-temperature vulcanizing box.

[0027] In addition to reducing blistering and bulging and improving product quality, this vulcanization device also reduces the number of high-temperature vulcanization boxes, thereby reducing production energy consumption, shortening the length of the entire production line, reducing the space occupied by production equipment, and increasing the utilization rate of the production site.

[0028] The vulcanization method using the aforementioned silicone rubber cable extrusion vulcanization device comprises:

[0029] S10, extruding the silicone rubber onto the wire core to obtain a silicone rubber wire;

[0030] S20, high-temperature vulcanizing the silicone rubber wire until the extruded layer is completely vulcanized, and the high-temperature vulcanization temperature is 700° C. to 800° C.;

[0031] S30, actively cooled silicone rubber wire.

[0032] Among them, the silicone rubber can be extruded and formed using an extruder, and the extruded silicone rubber can be extruded onto the wire core to obtain a silicone rubber wire. For example, the wire core is placed on a pay-off frame, and a front tractor is configured downstream of the pay-off frame. The extruder is set downstream of the tractor. When the wire core passes through the extruder, it can receive the outer silicone rubber extrusion layer. At the end of the entire process, a take-up tractor is set to control the movement of the wire core, and the movement of the wire core drives the movement of the silicone rubber wire.

[0033] The silicone rubber wire is then vulcanized at high temperature until the extruded silicone rubber layer is completely vulcanized. During this process, due to the rapid and intense high-temperature vulcanization, the extruded layer is completely vulcanized, and the entire extruded layer becomes a single unit. Its strength can overcome the expansion pressure of the wire core and the gas inside the silicone rubber wire, so individual points will not bulge or foam.

[0034] In this embodiment, the high-temperature vulcanization temperature is controlled between 700°C and 800°C. Under these temperature conditions, the extruded layer can be completely vulcanized in a short period of time, and the mechanical strength and other indicators of the extruded layer are rapidly and evenly improved, which has a certain "resistance" to the expansion of internal gas. In addition, compared to vulcanization temperatures below 700°C, the high temperature of this embodiment can also completely release the gas derivatives generated during the vulcanization of the internal material, while the gas originally in the space is fully expanded, thus preventing further gas generation in certain locations when the temperature is subsequently lowered, and preventing the gas expansion from causing foaming and bulging.

[0035] Afterward, the silicone rubber wire is actively cooled. Active cooling involves providing a medium for contact heat exchange with the silicone rubber wire. As you can easily understand, active cooling is the opposite of natural cooling. During this process, the actively supplied medium causes the expanding air inside to contract rapidly due to the cooling, with both the speed and magnitude of the contraction greater than that of the extruded layer. This ensures a tight fit between the wire core and the extruded silicone rubber layer, achieving an ideal state. Natural cooling, of course, does not achieve this effect.

[0036] In this way, through the rapid high-temperature vulcanization at 700°C to 800°C in the implementation method, and the active cooling after high-temperature vulcanization, quality problems such as foaming and bulging during the vulcanization process are eliminated, product quality is improved, production costs are reduced, and production delivery time is met.

[0037] Furthermore, after extrusion molding, high-temperature vulcanization at 700°C to 800°C is directly performed without other process steps involving heating, so as to reduce the impact of thermal expansion of the gas inside the silicone rubber line on the extruded layer.

[0038] Furthermore, in the high-temperature vulcanization process, the high-temperature vulcanization time can also be controlled to allow the air inside the silicone rubber wire to fully expand due to the heat. After the air inside the silicone rubber wire is fully expanded due to the heat, the internal gas pressure causes a gap to exist between the inner surface of the silicone rubber layer (extrusion layer) and the outer surface of the wire core, which is in an "empty tube state" to a certain extent. In this empty tube state, the internal gas occupies the above-mentioned gap, and because it is fully heated, the internal gas is evenly distributed in the gap, and the pressure on the inner wall of the extrusion layer is almost equal everywhere; at the same time, the high-temperature rapid vulcanization mechanism also makes the extrusion layer strength and other indicators uniformly and rapidly improve, which has a good resistance to the expansion of the internal gas; further, in the subsequent active cooling, the shrinkage amplitude and shrinkage speed of the extrusion layer are relatively uniform, so it is also beneficial to improve product quality.

[0039] Furthermore, after high-temperature vulcanization, the silicone rubber wire is subjected to low-temperature vulcanization at 170° C. to 230° C., and then actively cooled.

[0040] Furthermore, in order to minimize the impact of moisture in the conductor or cable core on the appearance of the vulcanization process, the wire core is dried and preheated before the silicone rubber is extruded, thereby avoiding the impact of the semi-finished material itself on the vulcanization process.

[0041] In this embodiment, an extruder is used to extrude silicone rubber threads. During this process, the degree of vacuum during the extrusion process is controlled to maintain a certain vacuum level within the extrusion equipment (extruder). Specifically, a vacuum pump assembly can be used to evacuate the interior of the extruder to prevent the extrusion layer material, such as liquid silicone, from being entrained with air and other impurities when it adheres to the thread core.

[0042] Furthermore, in the step of actively cooling the silicone rubber wire, the cooling rate is controlled so that the cooling volume change of the extruded layer is smaller than the cooling volume change of the air inside the silicone rubber wire. As a result, the amplitude of the sudden decrease in the cooling volume of the internal gas is much greater than that of the silicone rubber layer, so that the cooled wire core and the silicone rubber extruded layer are released from the "empty tube state", and the cable core and the extruded silicone rubber layer fit tightly together to achieve an ideal state. It is easy to understand that controlling the cooling rate can be achieved by using different cooling media and different cooling temperatures. For example, liquid cooling generally has a faster cooling rate than air cooling, and it is easier to achieve the above-mentioned effect. It is easy to imagine that lower cooling temperatures can also be achieved.

[0043] To this end, in some preferred embodiments, active cooling involves liquid cooling of the silicone rubber wire. Liquid cooling allows for full contact between the liquid and the silicone rubber wire, improving cooling efficiency. A preferred liquid cooling medium is water. For example, the silicone rubber wire is drawn through a water tank, where the water maintains a relatively constant temperature and is actively cooled.

[0044] While the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. Silicone rubber cable extrusion vulcanization device, characterized in that: include: Extrusion machine, used to extrude silicone rubber onto the wire core to obtain silicone rubber wire; A vulcanization box group, comprising at least one high-temperature vulcanization box and one low-temperature vulcanization box, wherein the high-temperature vulcanization box is used to perform high-temperature vulcanization on the silicone rubber wire at 700°C to 800°C; Cooling unit, used to cool the silicone rubber wire after high temperature vulcanization; The conveyor line is used to transport the silicone rubber line to the cooling unit through the vulcanization box group.

2. The silicone rubber cable extrusion vulcanization device according to claim 1, characterized in that: The low-temperature vulcanization box is arranged between the high-temperature vulcanization box and the cooling unit, and the low-temperature vulcanization box is used to perform low-temperature vulcanization of the silicone rubber wire at 170° C. to 230° C.

3. The silicone rubber cable extrusion vulcanization device according to claim 2, characterized in that: The number of the high-temperature vulcanization boxes is 2, and the low-temperature vulcanization box is arranged between the high-temperature vulcanization box and the cooling unit away from the extrusion main machine.

4. The silicone rubber cable extrusion vulcanization device according to claim 1, characterized in that: The cooling unit is a water cooling tank.

5. The silicone rubber cable extrusion vulcanization device according to claim 1, characterized in that: A pay-off rack and a front tractor are provided on the front side of the extruder main unit, and a take-up rack and a take-up tractor are provided on the rear side of the cooling unit.

6. The silicone rubber cable extrusion vulcanization device according to claim 1, 2, 3, 4 or 5, characterized in that: The extrusion host is further connected to a vacuum unit, and the vacuum unit is used to perform a vacuum operation on the interior of the extrusion host.

Images