Structure of large diameter press roller

The structure of the large diameter squeezing rubber roller is different from that of ordinary squeezing rollers. The roller shaft head no longer uses the steel drying shaft head of ordinary squeezing, but adopts a flange type steel shaft head structure. This not only simplifies the overall structure of the roller and reduces processing costs, but also allows the cooling water to be evenly distributed throughout the roller body, which is beneficial for protecting the adhesive layer.

      During the operation of the large roll diameter press, due to the high line pressure, the deformation of the adhesive layer is also significant, resulting in a higher temperature of the adhesive layer. The maximum temperature of the roller surface increases with the increase of the thickness of the roller bread layer. For example, under the same conditions, when the thickness of the adhesive layer increases from 13mm to 23mm, the maximum temperature of the roll bread adhesive layer increases from 53 ℃ to 63 ℃. Therefore, it is necessary to equip the press roller with a cooling device to prevent damage to the rubber layer when the temperature is too high. For this purpose, the operating side of the stick is a hollow shaft head, and the end of the shaft head is equipped with a water inlet head, which is cooled by circulating water inside the roller body. The inlet head rotates together with the roller body to discharge the circulating water.

       Due to the high line pressure between the rollers and the high bearing load, the bearings should be lubricated with thin oil circulation. The installation of bearings no longer uses a pull-out sleeve, but a taper is directly machined on the shaft head of the stick, and the bearing is fixed directly on the taper surface with a round nut. In order to improve installation accuracy and ensure proper fit between the tapered inner hole of the bearing and the tapered shaft, specialized hydraulic tools can also be used to install the bearing. The dismantling of bearings is carried out using hydraulic devices. Install an annular groove on the conical surface of the shaft head, drill a long hole at the end of the shaft head to communicate with it, and the end of the long hole has a tapered pipe thread. When the bearing needs to be disassembled, inject high-pressure oil into the conical annular groove through the long hole with a high-pressure oil pump, causing the inner ring of the bearing to expand and retreat along the conical surface. This structure requires the cone surface of the shaft head to be precisely machined, tightly matched with the bearing cone hole, and without any leakage parts, otherwise the bearing is difficult to retract.