Three-head microwave-assisted rock breaking hydraulic breaking hammer
A hydraulic breaker and microwave-assisted technology, which is applied in the field of hard rock roadway excavation in coal mines, can solve problems such as uneven thermal stress and reduce rock strength, and achieve the effects of reducing compressive strength, reducing wear and improving rock breaking efficiency.
Pending Publication Date: 2021-05-28
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology
Microwave heating assisted rock crushing mainly utilizes the difference in microwave activity of rock-forming minerals to introduce temperature gradients into the interior of rocks, resulting in uneven thermal stress. When these thermal stresses exceed the viscosity of some minerals in the rock or between different minerals Micro-cracks will occur when the bond strength is reduced, thereby reducing the strength of the rock
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[0027] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The specific embodiments described here are only used to illustrate and explain the present invention, not to limit the present invention.
[0028] refer to Figure 1-Figure 3 , a rock-breaking method using a three-head microwave-assisted rock-breaking hydraulic hammer, comprising the following steps:
[0029] S1. By selecting appropriate fixing bolt holes (20) and fixing bolts (8), three hydraulic breakers and three microwave-assisted rock-breaking devices are alternately installed in the housing (7), so that the distance between the hydraulic breakers and the microwave The distance between the auxiliary rock-breaking device and the rock mass is in an appropriate position;
[0030] S2. Start the supporting roadheader, and send the entire three-head microwave-assisted rock-breaking hydraulic breaker to a certain distance in front of the rock; ...
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The invention discloses a three-head microwave-assisted rock breaking hydraulic breaking hammer, belongs to the technical field of comprehensive mechanized heading machines for coal mine underground hard rock roadway development operation. The hammer solves the problem that mechanical rock breaking of a coal mine hard rock roadway is currently difficult. The hammer comprises three hydraulic breaking hammer bodies which are used for mechanical rock breaking and comprise drill rods, pistons and hydraulic cylinders, three microwave-assisted rock breaking devices which are used for microwave heating of rock mass and comprise waveguide tubes, microwave emitting devices, microwave emitting heads and cooling liquid, and a shell for protecting the hydraulic breaking hammer bodies and the microwave-assisted rock breaking devices; the first microwave-assisted rock breaking device is installed on the right side of the first hydraulic breaking hammer body through a bolt, the second hydraulic breaking hammer body is installed on the right side of the first microwave-assisted rock breaking device through a bolt, the second microwave-assisted rock breaking device is installed on the right side of the second hydraulic breaking hammer body through a bolt, the third hydraulic breaking hammer body is installed on the right side of the second microwave-assisted rock breaking device through a bolt, the third microwave-assisted rock breaking device is installed on the right side of the third hydraulic breaking hammer body through a bolt, and the shell wraps the hydraulic breaking hammer bodies and the microwave-assisted rock breaking devices. The hammer utilizes the microwave rock breaking principle of forming a temperature gradient by rock mass and the stress wave superposition principle of three-point synchronous impact to greatly reduce the compressive strength of rock, improve the rock breaking efficiency of the breaking hammer and reduce the abrasion of the drill rods, thus realizing breaking of hard rock with f exceeding 10.
Description
technical field [0001] The invention relates to a three-headed microwave-assisted rock-breaking hydraulic breaker in the technical field of rock breaking, which is mainly used in cooperation with roadheaders for driving hard rock roadways in coal mines. Background technique [0002] With the development of the economy and the needs of national strategic development, the number of underground space development projects is increasing. At present, drilling and blasting, shield tunneling and cutting are often used to break rocks in underground space engineering. The traditional drilling and blasting method has complex procedures, poor controllability, and produces a large amount of rock dust, which is harmful to health; the shield method is expensive and has limitations in application scenarios; the cutting method is not effective in hard rock roadways; and the roadheader loaded The hydraulic breaker is widely used in hard rock roadways because of its small rock dust, low cost ...
Claims
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IPC IPC(8): E21C27/28E21C37/16
CPCE21C27/28E21C37/16
Inventor 岳中文王鹏岳小磊李阿康周俊王煦彭麟智
Owner CHINA UNIV OF MINING & TECH (BEIJING)