The invention relates to the field of percussive rock drilling equipment, in particular to a composite rock drilling tool and a rock drilling method.
Background technique:
The development of the mining industry in my country is very rapid. In recent years, the output value of mining and the investment in mining equipment have been increasing at a rate of 40%, of which the scale of investment in open-pit ferrous metal mines and non-ferrous metal mines has exceeded 100 billion yuan..Mine mining mainly includes three parts: open-pit mining, underground mining and ocean mining. The output of open-pit mining accounts for more than 60% of the total mining volume..
In the mining of large open-pit mines, the drilling and blasting method is commonly used to crush the ore.Now mine drilling and rock drilling equipment mainly includes top hammer hydraulic rock drilling rigs, down-the-hole drilling rigs and roller rigs.The parameters of the blast hole determine the operating efficiency and energy consumption of the drilling rig. For the same blasting area, if the diameter of the blast hole increases, the blast hole spacing can be increased, which can reduce the energy loss caused by the frequent displacement of the drilling rig; With the same blast hole diameter and blast hole spacing, increasing the blast hole depth will rapidly increase the blasting volume of a drilling rig, which also reduces the energy consumption of the rig and improves the drilling efficiency..Increasing the diameter and depth of the hole poses new challenges for drilling and rock drilling equipment.
Therefore, there is a need for a composite rock drilling tool and rock drilling method that can achieve large diameter and deep rock drilling, thereby improving the efficiency of drilling and rock drilling equipment and reducing its mining energy consumption to promote the development of key technologies for drilling and drilling in large mines.
Technical realization elements:
The purpose of the present invention is to provide a composite rock drilling tool and a rock drilling method. The specific technical solutions are as follows:
The composite rock drilling tool includes a drill pipe, a down-the-hole impactor, and a roller cone bit. One end of the drill pipe is a bit end, and the down-the-hole impactor is sleeved on the bit end along the center axis of the drill pipe A plurality of the roller cone bits are arranged circumferentially on the drill bit end around the center axis of the drill rod, the impactor bit is provided on the down-the-hole impactor, and the working surface of the impactor bit is The working surfaces of the roller cone bits are all facing the working direction of the drill rod, and the protruding length of the working surface of the impactor bit along the working direction of the drill rod is greater than the length of the working surface of the roller bit. The protruding length of the drill rod in the working forward direction.
Preferably, the working surface of the roller cone bit is inclined toward the center axis of the drill rod, and the angle between the axis of the roller cone bit and the center axis of the drill rod is 30 to 45.
Preferably, the drill rod includes a transition drill rod and a drill bit holder fixedly connected in series along the center axis of the drill rod, the drill bit holder is arranged at the end of the drill bit, and a plurality of roller cone bits are arranged on the drill bit holder.
Preferably, a first limit sleeve and a second limit sleeve are provided along the central axis inside the drill rod for sleeve setting the down-the-hole impactor, and the first limit sleeve is provided with a distance away from the down-the-hole impactor. One end of the impactor bit is provided, and the second limit sleeve is provided close to the end of the down-the-hole impactor where the impactor bit is provided.
Preferably, one end of the down-the-hole impactor is provided with an impactor bit, and the other end of the down-the-hole impactor is provided with a connector for connecting a drill tool to drive the rotation of the down-the-hole impactor.
The method of using the above composite rock drilling tool to perform rock drilling operations specifically includes the following steps:
Step 1. The impactor bit provided on the down-the-hole impactor contacts the rock surface and drills a small-diameter central hole;
Step 2: Push the composite rock drilling tool, the cone bit starts to contact the rock surface and drills, forming a large-diameter borehole around the center hole.
Preferably, an external power mechanism is connected to the composite rock drilling tool and pushed to the working point to rotate the drill rod and drive the roller cone bit and the down-the-hole impactor to rotate
The application of the technical solution of the present invention has at least the following beneficial effects:
(1) The present invention is equipped with a roller bit and a down-the-hole impactor on the drill rod at the same time, and the down-the-hole impactor and the roller bit are arranged one after the other, the impactor bit on the down-the-hole impactor is positioned forward, and the roller bit Later, in the drilling operation, the impactor bit first contacts the working rock formation and drills a small-diameter center hole. By drilling the center hole, a free surface is formed inside the drilled rock, which is beneficial to the cone bit for further reaming and drilling. , Improve the efficiency of rock breaking. At the same time, due to the impact drilling of the impactor, the rock around the center hole is pre-damaged, which reduces the torque of the subsequent roller cone bit when drilling the rock, greatly improves the drilling efficiency, reduces the wear of the drilling tool, and significantly Reduced mining energy consumption
(2) The angle between the axis of the roller cone bit and the center axis of the drill rod in the present invention is 30 to 45, which maximizes the work of drilling and reaming the roller cone; meanwhile, the drill rod in the present invention is divided into transition drills. Rod and rock drill bit holder, easy to produce and assemble the product.
(3) The present invention uses a limit sleeve to stabilize the down-the-hole impactor, which is sleeved inside the drill rod, and the structure is simple and reliable; at the same time, the down-the-hole impactor of the present invention is provided with a connector at one end to facilitate the external power mechanism to drive the drill to rotate.
Description of the drawings
The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention..In the attached picture:
Fig. 1 is a schematic structural diagram of a composite rock drilling tool according to embodiment 1 of the present invention;
Among them, 1, cone bit, 2, drill rod, 2.1. Transition drill pipe, 2.2. Drill bit holder, 3. Down-the-hole impactor, 3.1. Connector, 3.2. Impactor bit, 4. The first limit sleeve, 5. The second limit sleeve, 6. The center hole.
detailed description
The following describes the embodiments of the present invention in detail with reference to the accompanying drawings, but the present invention can be implemented in a variety of different ways defined and covered by the claims..
Example 1:
A composite rock drilling tool, see Figure 1, includes a drill rod 2, a down-the-hole impactor 3, and a roller cone bit 1. One end of the drill rod 2 is a bit end, and the down-the-hole impactor 3 runs along the drill rod 2 is sleeved on the drill bit end, a plurality of roller cone bits 1 are arranged circumferentially on the drill bit end around the center axis of the drill rod 2, and the down-the-hole impactor 3 is provided with Impactor bit 3.2. The impactor bit 3.The working surface of 2 and the working surface of the roller cone bit 1 both face the working forward direction of the drill rod 2, and the impactor bit 3.The protruding length of the working surface of the drill rod 2 in the working forward direction of the drill rod 2 is greater than the protruding length of the working surface of the roller bit 1 in the working forward direction of the drill rod 2.
The working surface of the roller cone bit 1 is inclined toward the center axis of the drill rod 2, and the included angle between the axis of the roller cone bit 1 and the center axis of the drill rod 2 is 30 to 45.
The drill rod 2 includes a transition drill rod 2 fixedly connected in series along the central axis of the drill rod 2.1 and drill bit holder 2.2. The drill bit holder 2.2 is arranged at the end of the drill bit, and a plurality of the roller cone bits 1 are arranged on the wholesale rock drill bit holder 2.2 on.
The drill rod 2 is provided with a first limit sleeve 4 and a second limit sleeve 5 along the central axis for the sleeve of the down-the-hole impactor 3, and the first limit sleeve 4 is far away from the down-the-hole impact is provided with the impactor bit 3.2 is set at one end, and the second limit sleeve 5 is close to the down-the-hole impactor 3 and is provided with the impactor bit 3.Set at one end of 2.
An impactor bit 3 is provided at one end of the down-the-hole impactor 3.2. The other end of the down-the-hole impactor 3 is provided with a connector 3.1 Used to drive the DTH impactor 3 to rotate with an external drilling tool.
When the above-mentioned composite rock drilling tool is working, firstly connect an external power mechanism to the composite rock drilling tool and push it to the working point, so that the drill rod 2 is rotated and drives the roller cone bit 1 and the down-the-hole impact rotates; then pushes the compositeThe rock drilling tool is moving forward, and the impactor bit 3 provided on the down-the-hole impactor 3.2 First contact the rock surface and drill a small-diameter central hole 6; finally, continue to advance the composite rock drilling tool, and the cone bit 1 starts to contact the rock surface and drills, forming a large hole around the central hole 6. Bore hole.
The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes..Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.