A light full-hydraulic drilling rig for underground drilling in coal mines

Abstract

The invention discloses a light full-hydraulic drilling rig for underground drilling in coal mines, which includes a frame, a drill pipe, a braid, a guide rail, a propulsion hydraulic cylinder, a hydraulic clamp and a drill power head, and the hydraulic clamp includes a clamp base , support seat, clamping hydraulic cylinder and clamper slips; water braid includes water braid housing, water braid shaft, water braid hollow shaft, two wear rings, isolation ring, front end cover, rear end cover and wear resistance Sealing ring, drilling rig power head includes reduction box body, connecting frame, gear shaft, hollow stepped shaft, hydraulic motor, spring mounting seat, spring limit seat, end face retaining ring, gear, disc spring group, power head slips and clips Tighten the hydraulic cylinder. The invention is compact in structure, easy to implement and low in cost, reduces energy consumption, improves power transmission efficiency, has stable and reliable clamping force on the drill pipe, can prolong the service life of the wear-resistant sealing ring and the braided shaft, and reduces the trouble of replacement , to ensure the construction progress and safe production, reduce the vibration of the drilling rig, and avoid the drill pipe from being broken.

Description

technical field [0001] The invention belongs to the technical field of drilling rigs, and in particular relates to a light full-hydraulic drilling rig for underground drilling in coal mines. Background technique [0002] With the further mining of coal in my country, the characteristics of thin coal seam and deep occurrence are becoming more and more obvious, coupled with the regional differences in the distribution of coal resources in my country, the problem of gas drainage has become increasingly prominent. The gas drainage drilling rig is mainly used for drilling gas drainage holes, outburst prevention and pressure relief holes, coal seam water injection holes and other underground holes in coal mines. At present, the fully hydraulic drilling rigs used in small and medium cross-section gas drainage tunnels are mainly composed of four major parts: pump station, main engine, column frame and console. The main engine includes power head, supporting plate device, frame, wate...

AI Technical Summary

Problems solved by technology

[0003] 1. The overall structure of the main engine of the drilling rig is complex, which is not easy to install; the reliability is low, and the maintenance workload is heavy, which affects the work efficiency; work efficiency;

[0004] 2. The structure of the limit mechanism of the power head of the drilling rig is too complicated. The power head is limited on the guide rail of the frame through the supporting plate. At the same time, there are intermediate seats, copper plates and other parts between the supporting plate and the guide rail. The weight of the drilling rig affects the positioning accuracy of the drilling and reduces the drilling efficiency of the drilling rig; the guide rail structure is a U-shaped channel steel opening to the right, which is symmetrically arranged on the frame. The disadvantage of this structure is that during use It is prone to elastic deformation, which makes the guiding accuracy worse, increases the vibration of the drilling rig, and even causes the breakage of the drill pipe, causing accidents and affecting the work efficiency;

[0005] 3. The drilling rig completes the drilling task through the cooperative work of the propulsion cylinder and the power head. The piston rod of the propulsion cylinder is fixed on the supporting plate, and the hydraulic thrust acts on the drill pipe through the supporting plate. This structure results in the distance between the hydraulic thrust and the drilling resistance If it is too large, a large force couple will act on the supporting plate, resulting in elastic bending deformation of the supporting plate, which will affect the guiding accuracy of the power head and even break the drill pipe; the structure of the power transmission mechanism of the drilling rig is complicated, and the power input shaft It is connected to the slip hollow shaft through the key, and the slip hollow shaft transmits the power to the drill pipe in the slip hollow shaft through the slips, the power transmission efficiency is low, and the length of the whole machine is long;

[0006] 4. The full hydraulic clamping mechanism of the slips has a complex structure and high sealing requirements. In actual work, the sealing ring is prone to failure under the strong vibration of the drilling process, so that the clamping force on the drill pipe becomes smaller; moreover, The clamping slips are not lubricated and exposed. When the drilling rig is operating at an elevation angle, impurities such as mud and coal powder will be stuck in the moving groove of the slips, making it difficult to clamp and loosen the drill pipe and affect work efficiency;

[0007] 5. The slips are a completely closed structure. Inside the slips, the output shaft of the power head transmits the power from the power head to the drill pipe through a rigid threaded connection. During the drilling process, how much damage will occur due to improper operation or geological changes? The torque causes the threaded connection to be glued, making it difficult to disassemble the drill pipe, and even the output shaft is twisted at the threaded connection, and it is difficult to remove it stuck inside the slip;

[0008] 6. Due to the high-speed rotation and radial vibration of the water braided shaft, the sealing ring between the shell and the water braided shaft is often worn or crushed. The service life of the sealing ring is short and it needs to be replaced frequently. If the replacement is not timely, it will cause Water leaks, and it is easy to cause damage to the water braided shaft. After the water braided shaft is damaged, it is troublesome to replace and the cost is high. The replacement of the sealing ring and the water braided shaft will affect the construction progress and affect the user's safe production.

[0009] 7. The hydraulic clamp is composed of three steel plates arranged in an equilateral triangle and welded together. In order to ensure the accuracy of drilling, the three steel plates must be strictly 60° to each other, but it is difficult to guarantee in the actual welding process; Moreover, since the entire bracket is a welded structure, long-term vibration and hydraulic reaction force will cause cracks at the weld; in addition, affected by the welding bracket, the position of the guide hole of the cover plate fixed on the bracket will change; under the action of the above factors, The slip center of the gripper is inconsistent with the center of the drilling rig power head, and the added drill pipe is inconsistent with the center of the drill pipe clamped by the gripper, resulting in difficulty in centering, damage to the threaded connection between the drill pipes, and increased vibration of the drilling rig , and even break the drill pipe

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