Automatic reducing borehole-enlarging drilling tool
A reaming and automatic technology, which is applied to drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of poor practicability, unguaranteed hole diameter, long reaming time, etc., and achieves simple structure and fully guaranteed hole diameter. , Reliable effect of reaming action
Inactive Publication Date: 2011-11-02
CHINA COAL RES INST
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Problems solved by technology
[0006] In order to overcome the shortcomings of the existing automatic variable-diameter reaming drilling tool, such as long reaming time, unguaranteed drilling aperture, and poor practicability, the present invention provides a four-bar linkage automatic variable-diameter reaming drilling tool with a new principle and a new structure. The reaming drilling tool can automatically carry out the reaming operation as the drilling machine advances and retreats without other auxiliary operations.
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[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0014] figure 1 It is a schematic diagram of the variable diameter reaming drilling tool structure and the working state of normal drilling operations. An ordinary drill bit with a diameter of 75-90mm is installed at the front end of the automatic variable diameter reaming drill. During normal drilling, the rear drill body 2 is deeply inserted into the front drill body 1 under the thrust of the drilling rig, and the front part of the rear drill body 2 locks the support tool rest 6, and the support tool rest is tightly hugged on the front drill body 1. And the support tool rest 6 tightly hugs the cutting tool rest 5 on the rear drill body 1 through the connecting pin 7, and now the connecting rod mechanism cannot be opened, and the drilling diameter at this time is the mechanical design of the variable diameter reaming drill The diameter is 75-90mm. D...
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An automatic diameter changing and hole enlarging drilling tool, which is used for the outburst prevention measures for constructing the large-diameter drilling holes and the gas drainage drilling holes in a coal seam, can eliminate the induced outburst risk for the one-time large-diameter drilling hole construction and further improve the effect of the outburst prevention measures and the gas drainage effect. The automatic diameter changing and hole enlarging drilling tool is composed of a front drill body, a rear drill body, a connecting nut, a sliding sleeve, a cutting tool carrier and a supporting tool carrier in (figure 1). When normal drilling is performed, the supporting tool carrier and the cutting tool carrier are respectively fixed on the front and the rear drill bodies, and thesmall-diameter holes are drilled by a common drill bit; when the hole enlarging operation is performed, the rear drill body is drawn out of the front drill body for a certain distance under the action of the extraction pulling force, the supporting tool carrier is unlocked; and under the actions of the resistance force of the hole wall of the drilling hole and the rotating centrifugal force, the sliding sleeve is moved backwards, the supporting tool carrier and the cutting tool carrier are propped open, and then drilling and hole enlarging operations can be performed. At the hole sealing section of the gas drainage drilling hole, the drilling machine stops rotating, the drilling tool is directly pulled out, and a hole opening with a small diameter is formed, thereby conducing to the hole sealing.
Description
technical field [0001] The invention relates to an automatic variable-diameter and variable-diameter drilling tool, which is used in coal mines to construct large-diameter outburst prevention measure drilling holes in outburst dangerous coal seams and large-diameter gas drainage drilling holes in gas-containing coal seams, eliminating the need for direct construction of large-diameter drilling holes to induce coal Highlight the danger with gas, improve the anti-burst effect and gas drainage effect. Background technique [0002] At present, the variable-diameter reaming drills used in my country's coal mine gas prevention and control field mainly include the "variable-diameter reaming drill" with the application number of 96226431.8 and the "automatic variable-diameter reamer" with the application number of 03245809.6. [0003] The inventors of "Variable Diameter Reaming Drilling Tool" are Wang Kuijun, Cai Chenggong, Xin Xinping and Xu Zhaoze. The purpose of this drilling to...
Claims
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IPC IPC(8): E21B10/32E21F7/00
Inventor 蔡成功马丕梁
Owner CHINA COAL RES INST