Assembly method of disc cutter

Abstract

The invention provides a method for assembling a disc cutter, which comprises the following steps of: 1) heating a closed end cover, and assembling the closed end cover on a cutter body to be compacted; 2) mounting a cutter ring on the cutter body, preheating the cutter ring, immediately assembling after the inner circle of the part is heated and expanded, and welding a split ring for fixing after the part is cooled; (3) a floating seal is clamped between the closed end cover and the cutter body; cylindrical rollers are loaded into the rectangular ring cavities in the inner wall of the cutter body one by one, and the sealing ring seats are pressed into the cutter body; (4) the cutter shaft is assembled, the spherical rollers are loaded into the circular ring cavity in the cutter body one by one along the cutter shaft through hole, and the cutter shaft through hole is blocked and sealed through a shaft hole blocking piece; the method comprises the steps of (1) placing a torque ring on a hob ring, (2) placing the torque ring on the hob ring, and checking the torque of the hob on a pressing machine or by using a shaft wrench, (6) testing the air tightness by using a sealing test tool, and (7) refilling lubricating oil by using a funnel or refilling lubricating grease and silica gel to fill a gap position among a wrench hole, a plug and a nut, and is suitable for being used as an assembly method of the hob.

Description

technical field [0001] The invention relates to an excavating tool in the field of geotechnical excavation, in particular to a method for assembling a disc-shaped hob. Background technique [0002] Disc hob is a kind of excavation tool for breaking hard rock. It is installed on the head of large trenchless construction equipment such as shield, TBM and pipe jacking. Its function is to cut the rock on the face and remove the rock from the face. peel off. Widely used in subway tunnels, railway tunnels, diversion tunnels and urban underground pipe network construction workers. [0003] Disc hob is a kind of cutter with replaceable cutter ring, which usually has single edge, double edge and multi-edge, and is often installed on the shield machine cutter head in a radial or spiral distribution. The shield machine drives forward under the pressure of the jack, and at the same time, the cutter head of the shield machine rotates. The cutting edge of the cutter ring is used to pro...

AI Technical Summary

Problems solved by technology

Among them, the disc-shaped hob drives the cutter ring to rotate through the tapered roller bearing. When the disc-shaped hob is working, it not only bears the positive pressure in the circumferential direction of the cutter ring, but also receives the tangential friction force of the cutter ring and the lateral direction. The action of alternating stress, complex force

However, the inventor found the following problems during the construction process: 1. The load capacity of the bearing directly affects the load capacity of the disc hob. When the rock hardness is high, the shield machine cannot continue to work because the load that the bearing can bear is small. Pushing the hob with high thrust, the hob can only grind the cutter ring on this basis, which not only cannot effectively break the rock but also causes the wear of the cutter ring and easily leads to early failure of the cutter; 2. The internal bearing of the hob is overloaded and the bearing Damage to the disc hob will cause the disc hob to fail to work normally, affect the rock breaking effect, and delay the construction progress; 3. The service life of the internal bearing of the hob is limited. When the bearing reaches the limit operating time, it needs to be replaced regularly, which is time-consuming and labor-intensive, increasing the cost

4. When the hob rotates passively, the contact surface between the cutter ring and the rock is large, the friction force is large, and the resistance is large. The rotation of the internal bearing of the hob is not smooth enough, the excavation efficiency is low, and it is easy to cause the hob cutter ring to collapse and wear too fast. The situation occurs, which greatly reduces the service life of the hob

5. When replacing the internal bearing of the hob, the disassembly and assembly process is cumbersome, and the inner ring of the bearing needs to be pressed out by a special desktop press. The construction process requires high requirements, and it is difficult to replace it while ensuring sealing and smooth rotation.

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