Disc type double-edge hob bin and material for same

Abstract

The invention relates to a disc type double-edge hob bin and a material for the same. The hob bin is composed of a first hob bin plate, a second hob bin plate, a third hob bin plate, a connecting plate, a fixed wedge block, a locking wedge block and a stop block. The fixed wedge block, the locking wedge block and the stop block are all made of materials containing the following chemical elements in percentage by weight: 0.36-0.43% of C; 0.9-1.15% of Si; less than or equal to 0.6% of Mn; less than or equal to 0.025% of P; less than or equal to 0.005% of S; 3.5-4.3% of Cr; 1.8-2.3% of Mo; 0.3-0.6% of V; 1.3-1.8% of Co; and the balance of Fe. The first hob bin plate, the second hob bin plate and the third hob bin plate can be repeatedly used, in the using process, the wedge blocks and the stop block are parts making direct contact with a center hob, the wedge blocks and the stop block can be directly replaced after being abraded, the wedge blocks and the stop block are matched with the hob bin plates through fasteners, the wedge blocks and the stop block are subjected to overall heat treatment, the abrasion resistance is improved, the service life is prolonged, the replacement time isgreatly shortened, the utilization rate of the hob bin is increased, and meanwhile the safety risk of hob bin replacement is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel development, in particular to a disc-shaped double-edged hob cutter bin and materials used for the cutter bin. Background technique [0002] The disc-type double-edged hob is the main tool in the tunnel development project. It is fixed on the cutter bin by locking parts and bolts, and fixed on the cutter head with the cutter bin as the carrier. Due to the continuous change of the geological environment, the disc-type double-edged hob will bear great impact and vibration during the rock-breaking process, and these external forces will be applied to the knife chamber, so the knife chamber not only needs to disperse the force It is also necessary to firmly fasten the disc-shaped double-edged hob, so the knife warehouse plays an extremely important role in the tunnel construction project. [0003] Existing knife storehouse structure overall can be regarded as a rectangle, is made up of knife storehous...

AI Technical Summary

Problems solved by technology

There is a negative angle surface 15 in the knife compartment plate 11, and a 90-degree vertical plane 16 in the knife compartment plate 2 12 (see Figure 1), these two angled surfaces are the working surfaces that directly cooperate with the disc-type double-edged hob, so their shape and position tolerance requirements are relatively high. When the knife compartment plate 11 and the knife compartment plate 2 12 are respectively welded with the knife compartment plate 3 13 and the connecting plate 14, since they belong to dissimilar steel materials, they need to be preheated before welding and kept warm after welding. , the negative angle surface 15 on the tool magazine plate 11 is a non-connected processing surface. During the processing, this intermittent milling will affect the processing accuracy

After the assembly welding is completed, the negative angle surface 15 and the 90-degree vertical surface 16 need to be subjected to high-frequency surface treatment. The depth of the hardened layer can only reach about 10mm, and the hardness is between 50-55HRC. If the temperature is too high, it will affect the surface of the processed surface. quality and precision

[0005](2) The disc-shaped double-edged hob will generate a lot of vibration and bear a large force load during the working process. The wear of the contact surface between the double-edged hob and the knife box will cause the knife to loosen, and in severe cases, the knife will fall off and cause an accident

[0006](3) In addition to the above reasons, it is very time-consuming and difficult to maintain and replace the integral knife magazine plate on site. The bin is welded to the cutter head, and the weld seam is deep and the welding area is large. Therefore, carbon arc gouging is generally used for forced destructive dismantling when replacing the cutter bin. Each dismantling takes 5-6 hours. On-site construction environment impact, time may increase

After dismantling the tool box, the hole of the tool box needs to be re-grinded, and the follow-up welding process is more time-consuming

When installing a new knife magazine, since the knife magazine hole on the cutter head is already used for the second time, it will greatly increase the installation time and difficulty of the new knife magazine

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