With the development of industrialization, the rubber-sheathed flexible cable has been the main equipment installation cable used for various mobile occasions due to its stable electrical performance, excellent mechanical and physical properties, especially the soft characteristics. Large-scale open-pit mines and metal mines currently have large hit-and-run cables that often carry large amounts of gravel and sharp objects. Cables are often subject to significant drag forces as they move through large mining equipment, so towed Rubber cables rely on special structural design to reduce the impact of external torsional force on the sheath material, thereby increasing the service life of the cable as a drag the occasion of the installation and use of equipment.
In the often drag, friction occasions, the reduction of cable life is often caused by the wear and tear of the sheath from the outside to the inside of the damage caused to the insulated core, so the life of the sheath directly affects the service life of the cable. Trailing cable adopts the traditional sheath thickness is divided into two, increase the structure of the braid between two layers of sheath to increase the binding force of the inner and outer sheath, the braid uses the material with a certain elastic force to buffer the cable sheath Set in the reaction of the reaction process, thereby enhancing the life of the cable.
Will be realized once the jacket is divided into two to achieve, naturally, the thickness of each layer of the jacket will be thin, greatly increasing the difficulty of the process to achieve, therefore, the rubber material in the extrusion mold selection is particularly important. Under normal circumstances, the production of ordinary rubber sleeve cable, through the ratio of mold core and mold to provide greater pressure will be filled into the cable core to achieve, the general core will choose a larger angle, reducing the angle of die sets (See Figure 1). The difference between the mandrel and the die sleeve is generally controlled at about 15 ° C. The extrusion pressure of the rubber material is controlled by the angle difference, and the material is extruded on the surface of the cable core under compaction. The thickness of the inner and outer sheaths of the towing cable is relatively thin, and the production of the rubber material is squeezed production. When the outer protection is produced, the rubber material acts on the core in the extrusion die. When the pressure is too high, it is easy to cause the inner Jacket stacking and extrusion die card phenomenon.
To solve the above-mentioned mold, we have many theoretical designs and practical demonstration, by improving the mold core and mold sets of poor angle, can be a very good solution to the pressure caused by the pressure on the internal protection caused by the accumulation of clamping, greatly Improve the continuous production capacity of this kind of cable.
Improved body as shown in Figure 2:
Before the improvement of the mold parameters: α = 110 ℃, β angle is generally 89 ℃, the angle difference (α-β) is generally 21 ℃,
The improved alpha angle is generally at 89 DEG C, the beta angle is generally 68 DEG C, and the angle difference (alpha-beta) is generally 21 DEG C. The mode of the moderation is to reduce the alpha angle and decrease the beta angle. According to the mechanical analysis, With this perspective, the pressure on the inner jacket can be reduced when the outer jacket is extruded, which can well ensure the extrusion of the jacket.
After practice verification, can be well extruded, and the rubber sheath jacket smooth surface, no bamboo and so on, effectively solve the problem of the mold.
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