Directional drilling and reaming device of trenchless drilling machine

Abstract

The directional drilling and reaming device of the trenchless drilling machine comprises a reamer body, a cutter shaft is installed in the middle of the reamer body, the front end and the rear end of the cutter shaft are fixed to the peripheral face of the reamer body, a spiral blade is fixedly arranged on the peripheral face of the cutter shaft, and a cutter relieving groove is formed in the peripheral face of the middle of the reamer body. A reinforcing rib plate is arranged on the peripheral surface of the cutter shaft, a soil crushing inclined surface facing the front end of the reamer body is arranged on the outer side surface of the reinforcing rib plate, and a plurality of crushing teeth are fixedly arranged on the soil crushing inclined surface; the fixed type composite cone structure composed of the cutter shaft and the crushing teeth is adopted, due to the fact that the fixed type composite cone structure cannot move autonomously, fine control requirements are not needed, the fixed type composite cone can correctly cut into a bottom layer and keep stable in the drilling period along with a drill bit, and compared with an existing movable cone, the requirement for control precision of operators is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of trenchless drilling rigs, in particular to a directional drilling and hole expanding device for a trenchless drilling rig. Background Art

[0002] Trenchless directional drilling rig is a conventional equipment used in underground drilling operations. It can drill without damaging the ground, especially in pipeline laying, geological exploration and other construction purposes;

[0003] However, at present, when the reamer is used in conjunction with the drill rod to drill and expand the hole, the drilling angle may be offset due to the influence of various factors such as soil resistance and stratum changes during the drilling process. This not only affects the drilling accuracy and efficiency, but may also cause safety hazards. Therefore, it is very important to enhance the structural stability of the reamer, improve the reaming efficiency, and optimize the drilling angle control, especially when drilling and expanding the hole in relatively hard strata, so that the drill rod equipped with the reamer can avoid the deviation of the drilling angle to the greatest extent. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a trenchless drilling rig directional drilling and hole enlarging device with reasonable structural design and the auxiliary hole enlarging effect when making holes.

[0005] The technical problem to be solved by the utility model is achieved through the following technical scheme: a trenchless drilling rig directional drilling reaming device, comprising a reamer body, a front end of the reamer body being used for threaded connection with a drill bit and being arranged as the front end of the reamer body, and a rear end of the reamer body being used for threaded connection with a drill rod and being arranged as the rear end of the reamer body;

[0006] A plurality of cutter shafts are installed in the middle of the reamer body, the axes of the cutter shafts are parallel to the axes of the reamer body, the front and rear ends of the cutter shafts are fixed on the outer circumference of the reamer body, a spiral blade for reaming is fixed on the outer circumference of the cutter shaft, and a cutter groove facing the spiral blade is opened on the outer circumference of the middle of the reamer body;

[0007] Reinforcing ribs are fixedly provided on the outer circumferential surfaces of both axial ends of the cutter shaft, one end side surface of the reinforcing ribs is fixedly connected to the outer circumferential surface of the axial end of the cutter shaft, and the other end side surface is fixedly connected to the outer circumferential surface of the front end of the reamer body or the rear end of the reamer body, and a soil crushing slope facing the front end of the reamer body is opened on the outer side surface of the reinforcing ribs, and a plurality of crushing teeth are fixedly provided on the soil crushing slope.

[0008] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned trenchless drilling rig directional drilling and reaming device, there are 6 cutter shafts arranged at intervals, and the 6 cutter shafts are evenly distributed on the outer circumferential surface of the reamer body, and the installation angles between two adjacent cutter shafts are the same.

[0009] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned trenchless drilling rig directional drilling and reaming device, the reinforcing ribs are welded and fixed on the outer peripheral surfaces of the reamer body and the cutter shaft.

[0010] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned trenchless drilling rig directional drilling and reaming device, a chamfer is provided on the vertical surface of the knife groove close to the reamer body, and the angle between the inclined surface formed by the chamfer and the axis of the reamer body is 50°~60°.

[0011] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned trenchless drilling rig directional drilling and reaming device, the length of the knife groove accounts for 50% to 60% of the length of the reamer body.

[0012] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned trenchless drilling rig directional drilling and reaming device, the crushing teeth are fixed on the crushing slope at intervals, and two crushing teeth are arranged on each reinforcing rib plate.

[0013] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned trenchless drilling rig directional drilling and reaming device, the angle between the soil crushing slope and the axis of the reamer body is 20°~30°.

[0014] Compared with the prior art, the beneficial technical effects of the utility model are:

[0015] (1) The hole expansion device abandons the previous movable cone and adopts a fixed composite cone structure composed of a cutter shaft and a crushing tooth. Compared with the previous movable cone, which may be displaced or shaken due to factors such as formation changes and vibrations during drilling, resulting in the problem of instability or instability in the drilling direction, the fixed structure can avoid these problems as much as possible. In addition, the fixed cone is less prone to damage or wear, which reduces the frequency of replacement and maintenance and reduces the maintenance cost of the equipment.

[0016] (2) The fixed composite cone structure consisting of the cutter shaft and the crushing teeth does not move autonomously, so it does not require precise control. It can correctly cut into the bottom layer and maintain stability during the drilling process. Compared with the previous movable cone, it requires lower control accuracy for the operator;

[0017] (3) The previous movable cones cannot work effectively in hard rock or special formations because they need to achieve autonomous rotation. However, the fixed cutter shaft and crushing teeth used in this device will not be affected by factors within the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the full cross-section structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the utility model when viewed from above.

[0020] In the figure, 1. reamer body; 2. front end of reamer body; 3. rear end of reamer body; 4. drill bit; 5. drill rod; 6. cutter shaft; 7. spiral blade; 8. cutter groove; 9. reinforcing ribs; 10. soil crushing slope; 11. crushing teeth. DETAILED DESCRIPTION

[0021] The specific technical solutions of the present invention are further described below with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and do not constitute any limitation to the rights thereof.

[0022] Example 1, reference Figure 1-2 A trenchless drilling rig directional drilling and reaming device includes a reamer body 1, which is formed into a roughly hollow cylindrical structure, and its size specifications can be selected according to the use requirements. The front end of the reamer body 1 is used to be threadedly connected with a drill bit 4 and is set as the front end 2 of the reamer body, and the rear end of the reamer body 1 is used to be threadedly connected with a drill rod 5 and is set as the rear end 3 of the reamer body;

[0023] In order to facilitate the reaming operation when the drill rod 5 is drilled, a plurality of cutter shafts 6 are installed in the middle of the reamer body 1. The cutter shafts 6 are arranged at intervals, and the number is not limited thereto. The six cutter shafts 6 are evenly distributed on the outer peripheral surface of the reamer body 1 in the circumferential direction, and the installation angles between two adjacent cutter shafts 6 are the same. The axis of the cutter shaft 6 is parallel to the axis of the reamer body 1, and the front and rear ends of the cutter shaft 6 are fixed on the outer peripheral surface of the reamer body 1.

[0024] In order to enable the cutter shaft 6 to expand the deep hole during the drilling of the drill bit 4, a spiral blade 7 for expanding the hole is fixed on the outer circumference of the cutter shaft 6. The thickness of the spiral blade 7 can be selected according to the use requirements. When the drill bit 4 rotates for drilling, the spiral blade 7 also rotates with the drill bit 4, so as to spirally expand the inner circumference of the deep hole. Because the cutter shaft 6 and the spiral blade 7 are fixed on the outer circumference of the reamer body 1, that is, they are designed as an integral part of the reamer body 1, compared with the transmission movable gear, there will be no displacement or shaking due to factors such as formation changes or vibrations, and the failure rate is low, and the maintenance cost is low;

[0025] In order to avoid the problem that the radial dimension of the reamer body 1 is too large after the knife shaft 6 and the spiral blade 7 are installed, a knife groove 8 facing the spiral blade 7 is opened on the central outer peripheral surface of the reamer body 1. The knife groove 8 is an annular groove, and its design purpose is only to accommodate the edge of the spiral blade 7. The length of the knife groove 8 accounts for 50% to 60% of the length of the reamer body 1, for example, 50%. The vertical surface of the knife groove 8 close to the reamer body 1 is provided with a chamfer, and the angle between the inclined surface formed by the chamfer and the axis of the reamer body 1 is 50° to 60°, for example, 55°;

[0026] In order to improve the structural stability between the cutter shaft 6 and the reamer body 1, we have fixedly provided reinforcing ribs 9 on the outer peripheral surfaces of both axial ends of the cutter shaft 6. The reinforcing ribs 9 are formed into a roughly trapezoidal structure, and the thickness thereof can be selected according to the use requirements. The reinforcing ribs 9 are welded and fixed on the outer peripheral surfaces of the reamer body 1 and the cutter shaft 6. The side surface of one end of the reinforcing rib 9 is fixedly connected to the outer peripheral surface of the axial end of the cutter shaft 6, and the side surface of the other end is fixedly connected to the outer peripheral surface of the front end 2 or the rear end 3 of the reamer body.

[0027] In order to make it easier for the front end 2 of the reamer body to contact the deep hole and expand the hole during the drilling of the drill bit 4, a soil crushing slope 10 facing the front end 2 of the reamer body is provided on the outer surface of the reinforcing rib plate 9. The angle between the soil crushing slope and the axis of the reamer body 1 is 20° to 30°, for example, 20°.

[0028] In addition, in order to make it easier for the soil crushing slope 10 to crush and excavate the soil layer, we also fixedly set a number of crushing teeth 11 on the soil crushing slope 10. The crushing teeth 11 can adopt a trapezoidal structure. The crushing teeth 11 are fixed on the soil crushing slope 10 at intervals. Two crushing teeth 11 are set on each reinforcing rib plate 9, and the number is not limited to this.

[0029] When the trenchless drilling rig directional drilling and reaming device is used, it only needs to be threadedly connected between the drill bit 4 and the drill rod 5 for use. After use, we only need to remove the rock and soil attached to the cutter shaft 6 and the spiral blade 7, and remove the sludge in the cutter groove 8 to complete the maintenance of the reamer body 1, and the maintenance cost is low.

Claims

1. A directional drilling and hole enlarging device for a trenchless drilling rig, characterized in that: It comprises a reamer body, the front end of which is used to be threadedly connected to the drill bit and is arranged as the front end of the reamer body, and the rear end of which is used to be threadedly connected to the drill rod and is arranged as the rear end of the reamer body; A plurality of cutter shafts are installed in the middle of the reamer body, the axes of the cutter shafts are parallel to the axes of the reamer body, the front and rear ends of the cutter shafts are fixed on the outer circumference of the reamer body, a spiral blade for reaming is fixed on the outer circumference of the cutter shaft, and a cutter groove facing the spiral blade is opened on the outer circumference of the middle of the reamer body; Reinforcing ribs are fixedly provided on the outer circumferential surfaces of both axial ends of the cutter shaft, one end side surface of the reinforcing ribs is fixedly connected to the outer circumferential surface of the axial end of the cutter shaft, and the other end side surface is fixedly connected to the outer circumferential surface of the front end of the reamer body or the rear end of the reamer body, and a soil crushing slope facing the front end of the reamer body is opened on the outer side surface of the reinforcing ribs, and a plurality of crushing teeth are fixedly provided on the soil crushing slope.

2. A trenchless drilling rig directional drilling and hole enlarging device according to claim 1, characterized in that: There are 6 knife shafts spaced apart from each other, and the 6 knife shafts are evenly distributed on the outer peripheral surface of the reamer body in the circumferential direction, and the installation angles between two adjacent knife shafts are the same.

3. The trenchless drilling rig directional drilling and hole enlarging device according to claim 1, characterized in that: The reinforcing ribs are welded and fixed on the outer peripheral surfaces of the reamer body and the cutter shaft.

4. The trenchless drilling rig directional drilling and hole enlarging device according to claim 1, characterized in that: The vertical surface of the knife groove close to the reamer body is provided with a chamfer, and the angle between the inclined surface formed by the chamfer and the axis of the reamer body is 50°~60°.

5. The trenchless drilling rig directional drilling and hole enlarging device according to claim 1, characterized in that: The length of the cutter groove accounts for 50% to 60% of the length of the reamer body.

6. The trenchless drilling rig directional drilling and hole enlarging device according to claim 1, characterized in that: The crushing teeth are fixed on the soil crushing slope at intervals, and two crushing teeth are arranged on each reinforcing rib plate.

7. The trenchless drilling rig directional drilling and hole enlarging device according to claim 1, characterized in that: The angle between the soil crushing slope and the axis of the reamer body is 20°~30°.

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