Special accessories for 47-25 straight column cutting teeth high wear-resistant alloy layer coal mining machine and tunneling machine

Description :

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47-25 straight column cutters are key non-standard vulnerable parts in coal mining and tunnel excavation projects, mainly used to be installed on the drums of coal mining machines, tunneling machines, or rotary drilling machines, directly cutting and crushing coal seams and rock layers. This model of tooth adopts a straight column structure design, which can effectively resist high-strength impact loads and wear, and solve the problem of traditional tooth breakage and detachment in hard rock working conditions. Its core function is to invade the rock mass through the hard alloy body at the head, and to achieve efficient rock breaking by cooperating with the rotation of the cylinder. It is suitable for mining operations of medium hard to hard rocks and is the core consumable to ensure the efficiency of mechanized mining.

  The specifications of this 47-25 straight column cutting tooth strictly follow the industry standard, with a total length of usually around 250mm. The handle diameter is compatible with the 47mm series tooth seat, ensuring stability and coaxiality after installation. In terms of material, the tooth body is made of high-quality high-strength alloy structural steel, which has undergone overall quenching and tempering treatment to ensure that the matrix has sufficient toughness to absorb impact energy; The tooth head is embedded with YG11C or higher grade tungsten carbide hard alloy, with a uniform wear-resistant layer thickness and a bonding strength higher than industry standards. The production process includes high-frequency induction heating brazing to ensure that there are no pores or slag inclusions at the joint between the alloy head and the steel body. The heat treatment hardness is controlled between HRC45-50, and the hardness of the hard alloy reaches HRA88 or above, meeting the requirements for use under complex geological conditions.

  In the selection and application, the 47-25 straight column cutter is particularly suitable for the excavation of layered rocks, semi coal rock tunnels, and stripping operations in open-pit mines. When purchasing, it is necessary to focus on checking whether the tooth seat aperture is 47mm and whether the installation hole depth of the machine drum matches the length specification of 250mm. If the working condition is extremely hard granite or quartz sandstone, it is recommended to evaluate whether a higher cobalt content alloy head is needed to improve impact resistance; If it is soft coal or soil layer, the model may have excess performance, and lower cost ordinary cutters can be considered. Compared with conical cutters, straight column cutters have better stability under axial force, are less prone to eccentric wear, and are suitable for use in high-speed, high traction heavy machinery equipment.

  Before installing the 47-25 straight column tooth cutter, it is necessary to clean the coal powder, rust, and residue inside the tooth seat, apply an appropriate amount of lubricating grease or anti biting agent, and use a special hydraulic tool or hammer to push the tooth cutter into the tooth seat until the spring groove is completely exposed, and ensure that the protective ring or spring is installed in place to prevent it from falling off during operation. In daily maintenance, the wear of the cutting teeth should be regularly checked. When the alloy head wears down to 2/3 of the original diameter or cracks or breaks appear, it must be replaced immediately to avoid damaging the tooth seat or causing the drum to become unbalanced. Common failures include early fall off of alloy head, which is mostly caused by poor welding quality or abnormal lateral force. It is necessary to check whether the equipment traction speed and cutting angle are reasonable, and maintain a reasonable cooling water spray to reduce the working temperature and extend the service life.

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