Two Speed ​​Mining Drill Bits

Abstract

The invention discloses a two-speed mining drill bit. A coaxial drill bit group is provided with a central spindle, the front end of the central spindle is connected with a disc-shaped cutting piece with gear teeth, the rear end of the central spindle penetrates through a transmission case to be fixed on a shell of the transmission case by virtue of a bearing, a coaxial hollow blanking drill bit is arranged outside the central spindle, the outer diameter of the blanking drill bit is smaller than that of the cutting piece, the hollow part of the blanking drill bit is connected with the central spindle by virtue of a bearing, the blanking drill bit is connected with a hollow connecting sleeve coaxial to the blanking drill bit, the tail end of the sleeve extends into the transmission case, and the sleeve is connected with the body of the transmission case by virtue of a bearing; the transmission case is connected with a transmission shaft extending into the transmission case by virtue of a bearing, the inner end of the transmission shaft is connected with a driving bevel gear, the central spindle in the transmission case is connected with a driven central spindle bevel gear, the tail end of the sleeve is connected with a driven sleeve bevel gear, and number of teeth of the driven sleeve bevel gear is larger than that of the teeth of the driven central spindle bevel gear, and the driving bevel gear is meshed with the driven sleeve bevel gear and the driven central spindle bevel gear. The two-speed mining drill bit is simple and compact in structure and applicable to popularization and application.

Description

technical field [0001] The invention relates to a shearer cutter, in particular to a two-speed mining drill bit. Background technique [0002] Coal is one of the most important energy sources in China. It plays an important role in the development of the national economy and has a huge demand. The rapid development of China's coal mining industry has also brought about the great development of coal mining equipment, among which the coal mining machine is a key equipment. At present There are many types of coal shearers. Generally, the cutters are driven by mechanical transmission to drill the coal seam, so that the coal blocks are peeled off to realize coal seam mining. Therefore, the cutters play a vital role in the mining efficiency. Most of the existing cutters are It is an integrated structure. When mining, it is necessary to drill into the coal seam and advance as a whole to separate the cutting layer from the ore body layer by layer. Since the cutting layer is connecte...

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Problems solved by technology

[0002] Coal is one of the most important energy sources in China. It plays an important role in the development of the national economy and has a huge demand. The rapid development of China's coal mining industry has also brought about the great development of coal mining equipment, among which the coal shearer is a key equipment. At present There are many types of coal shearers. Generally, the cutters are driven by mechanical transmission to drill the coal seam, so that the coal blocks are peeled off to realize coal seam mining. Therefore, the cutters play a vital role in the mining efficiency. Most of the existing cutters are It is an integrated structure. When mining, it is necessary to drill into the coal seam and advance as a whole to separate the cutting layer from the ore body layer by layer. Since the cutting layer is connected to the ore body through the minerals in the body on the layered surface, when When the connected minerals are hard and large in size, not only does it require a large separation power, it is easy to damage the equipment, but also after the whole piece of connected minerals is peeled off, the large minerals will be further fragmented, and the remaining ore body surface will be damaged. If there are pits, if the texture around the pits is relatively loose, it will cause landslides, and serious accidents will result, which still needs technical improvement

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