Reverse circulation drilling deslagging rotary connection structure

Abstract

The utility model relates to a reverse circulation drilling deslagging rotary connecting structure which comprises a drill rod and a deslagging pipe, and the deslagging pipe comprises a vertical pipe section and an elbow pipe section. The drill rod is rotationally communicated with the vertical pipe section; the periphery of the lower end face of the vertical pipe section is provided with a circle of horizontal protruding edge in a protruding mode. A circle of horizontal lower flange ring is arranged on the periphery of the upper end face of the drill rod in a protruding mode, a plurality of inner threaded holes are vertically formed in the lower flange ring in a penetrating mode, lower bead screws are connected into the inner threaded holes in a one-to-one mode, and a circle of lower ring groove is formed in the lower surface of the horizontal protruding edge in a concave mode. A ball of the lower ball screw protrudes out of the upper surface of the lower flange ring and abuts against the interior of the lower ring groove in a rolling mode; a pressing ring is further arranged above the lower flange ring, the horizontal protruding edge is located between the lower flange ring and the pressing ring, the pressing ring is in threaded connection with a plurality of penetrating upper bead screws, a circle of upper ring groove is formed in the upper surface of the horizontal protruding edge in a concave mode, and beads of the upper bead screws protrude out of the lower surface of the pressing ring and abut against the interior of the upper ring groove in a rolling mode. The rotary connection structure is simple, low in cost and low in noise.

Description

Technical Field

[0001] This utility model belongs to the field of drilling technology for soil or rock in mining, and specifically relates to a rotary connection structure for reverse circulation drilling and slag removal. Background Technology

[0002] Traditional down-the-hole (DH) impactors, as disclosed in CN218912801U, involve airflow from top to bottom through the drill rod and drill bit, then flowing outwards through a hole at the bottom of the drill bit, and finally flowing upwards in the opposite direction to remove gravel and soil. Reverse circulation DH impactors, as disclosed in CN116591593A and CN2043268U, involve a main drill rod, extension drill rod, and drill bit connected vertically from top to bottom. A power head transmits torque to the main drill rod, causing the entire drill string to rotate. High-pressure gas is delivered downwards through a gas pipe on the outside of the drill rod, driving the drill bit to break rock and flow into the drill bit through a hole at the bottom of the drill bit. The gas then flows upwards through the inner holes of the drill bit and drill rod, removing gravel and soil. The upper end of the active drill rod is usually equipped with a lifting device and a slag discharge bend. During the rotation of the active drill rod driven by the power head, the lifting device and slag discharge bend remain stationary relative to the base frame of the reverse circulation drilling equipment where the power head is connected, facilitating operation and ensuring the orientation of the discharged slag. This requires a sealed rotational connection between the upper part of the drill rod and the slag discharge bend. In applications with low loads and low speeds, there are generally two solutions: using custom-made bearings or a sliding friction connection. However, both have drawbacks. Using custom bearings significantly increases the weight of the connection and is costly; while the simpler sliding friction connection typically results in less smooth rotation, generates noise, and has a shorter service life. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a rotary connection structure for reverse circulation drilling and slag discharge, so as to avoid the problem of poor rotary connection between the drill rod and the slag discharge bend in the current reverse circulation drilling, and achieve the effects of convenient manufacturing connection, ensuring the rotary connection effect and effectively controlling cost.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A reverse circulation drilling and slag removal rotary connection structure includes a drill rod and a slag removal pipe. The slag removal pipe includes a vertical pipe section and an elbow pipe section extending and bending at the upper end of the vertical pipe section. The drill rod has a vertically penetrating central slag removal through hole, and the upper end of the drill rod is rotatably connected to the lower end of the vertical pipe section. A horizontal flange protrudes around the lower end face of the vertical pipe section. A horizontal lower flange ring protrudes around the upper end face of the drill rod. Several internally threaded holes are vertically penetrating on the lower flange ring. The several internally threaded holes are circumferentially spaced on the lower flange ring. Each internally threaded hole is connected to a lower ball screw one-to-one, with the ball end of the lower ball screw facing upward. A lower ring groove is recessed on the lower surface of the horizontal flange, and the balls of all the lower ball screws protrude from the upper surface of the lower flange ring and roll against the lower ring groove.

[0006] A pressure ring is also provided above the lower flange ring. The horizontal flange is located between the lower flange ring and the pressure ring. The pressure ring is fixedly connected to the lower flange ring. Several upper ball screws are threaded onto the pressure ring. The several upper ball screws penetrate the pressure ring vertically and are arranged circumferentially. The ball ends of the upper ball screws face downward. An upper ring groove is recessed on the upper surface of the horizontal flange. The balls of all the upper ball screws protrude from the lower surface of the pressure ring and roll against the upper ring groove.

[0007] To further improve the above technical solution, the diameter of the lower flange ring and the pressure ring is larger than the diameter of the horizontal flange. The outer edges of the lower flange ring and the pressure ring are respectively raised with a ring of abutting steps that abut against each other. A connecting bolt is provided vertically through the lower flange ring, the abutting step and the pressure ring, and the pressure ring is fixedly connected to the lower flange ring by bolting.

[0008] Furthermore, there is a gap between the upper surface of the lower flange ring and the lower surface of the horizontal flange, a gap between the lower surface of the pressure ring and the upper surface of the horizontal flange, a gap between the abutting step and the outer side of the horizontal flange, and a gap between the inner wall of the pressure ring and the outer side of the vertical pipe section.

[0009] Furthermore, the number of connecting bolts corresponds to the number of upper ball screws and is circumferentially spaced, with each connecting bolt and each upper ball screw being staggered circumferentially.

[0010] Furthermore, an extension pipe section coaxial with the vertical pipe section is connected to the lower surface of the horizontal flange. The extension pipe section is inserted into the central slag discharge through hole of the drill rod, and a dynamic sealing ring is provided between the outer wall of the extension pipe section and the inner wall of the central slag discharge through hole of the drill rod.

[0011] Furthermore, the upper end of the drill rod is recessed and has a platform coaxial with the central slag discharge through hole, and the extension pipe section is inserted into and sealed in the platform for rotation.

[0012] Furthermore, the inner diameter of the vertical pipe section, the horizontal flange, and the extension pipe section shall not be less than the diameter of the central slag discharge through hole of the drill pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This utility model's reverse circulation drilling and slag discharge rotary connection structure has a gap between the upper surface of the lower flange ring and the lower surface of the horizontal flange, and a gap between the lower surface of the pressure ring and the upper surface of the horizontal flange. The lower flange ring and the pressure ring do not directly contact the horizontal flange; instead, they are all abutted by the rolling of the ball bearings in the ball screws. During use, the circumferential position of the slag discharge pipe remains unchanged, while the drill rod, lower flange ring, and pressure ring rotate relative to the slag discharge pipe, effectively maintaining the rotary connection. The rotary contact noise is low, and the service life is long. During manufacturing, the lower flange ring, pressure ring, and horizontal flange can all be cut from steel plates and welded to the drill rod and slag discharge pipe. After drilling and tapping, the required effective connection can be achieved by connecting the purchased standard ball bearings. Compared with custom-made special bearings, the manufacturing cost is low, and it can be prepared by using ordinary on-site steel reinforcement. Attached Figure Description

[0015] Figure 1 A schematic diagram of the reverse circulation drilling slag removal rotary connection structure connected to the power head in an embodiment;

[0016] Figure 2 for Figure 1 An enlarged schematic diagram of the reverse circulation drilling slag removal rotary connection structure in this embodiment;

[0017] Figure 3 Figure 2 A bottom view;

[0018] The components include: drill rod 1, lower flange ring 11, central slag discharge through hole 12, countersunk platform 13, slag discharge pipe 2, elbow pipe section 21, vertical pipe section 22, horizontal flange 23, extension pipe section 24, lower ball screw 3, pressure ring 4, upper ball screw 5, external hexagonal 51, tightening nut 52, abutment step 6, connecting bolt 7, and dynamic sealing ring 8. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0020] Please see Figures 1-3The reverse circulation drilling and slag discharge rotary connection structure of a specific embodiment includes a drill rod 1 and a slag discharge pipe 2. The slag discharge pipe 2 includes a vertical pipe section 22 and an elbow pipe section 21 extending and bending at the upper end of the vertical pipe section 22. The drill rod 1 has a vertically penetrating central slag discharge through hole 12, and the upper end of the drill rod 1 is rotatably connected to the lower end of the vertical pipe section 22. A horizontal flange 23 is raised around the lower end face of the vertical pipe section 22. A horizontal lower flange ring 11 is raised around the upper end face of the drill rod 1. A plurality of internal threaded holes are vertically penetrating on the lower flange ring 11. The plurality of internal threaded holes are circumferentially spaced on the lower flange ring 11. A lower ball screw 3 is connected one-to-one in each internal threaded hole, with the ball end of the lower ball screw 3 facing upward. A lower ring groove is recessed on the lower surface of the horizontal flange 23, and the balls of all the lower ball screws 3 protrude from the upper surface of the lower flange ring 11 and roll against the lower ring groove.

[0021] A pressure ring 4 is also provided above the lower flange ring 11. The horizontal protrusion 23 is located between the lower flange ring 11 and the pressure ring 4. The pressure ring 4 is fixedly connected to the lower flange ring 11. Several upper ball screws 5 are threaded onto the pressure ring 4. The several upper ball screws 5 penetrate the pressure ring 4 vertically and are arranged at circumferential intervals. The ball ends of the upper ball screws 5 face downward. An upper ring groove is recessed on the upper surface of the horizontal protrusion 23. The balls of all the upper ball screws 5 protrude from the lower surface of the pressure ring 4 and roll against the upper ring groove.

[0022] Understandably, the cross-section of the upper and lower annular grooves is of a minor arc shape, which matches the arc shape of the corresponding protruding spherical part of the bead. The vertical pipe section 22, the horizontal flange 23 (with its upper and lower ring grooves), the drill rod 1, the lower flange ring 11, and the pressure ring 4 are all coaxial. There is a gap between the upper surface of the lower flange ring 11 and the lower surface of the horizontal flange 23, and a gap between the lower surface of the pressure ring 4 and the upper surface of the horizontal flange 23. The lower flange ring 11 and the pressure ring 4 are not in direct contact with the horizontal flange 23, but are all in contact by the rolling contact of the ball bearings of the ball bearing screws. During use, the circumferential position of the slag discharge pipe 2 remains unchanged, while the drill rod 1, the lower flange ring 11, and the pressure ring 4 rotate relative to the slag discharge pipe 2, effectively maintaining the rotational connection. The rotational contact noise is low, and the service life is long. During manufacturing, the lower flange ring 11, the pressure ring 4, and the horizontal flange 23 are all cut from steel plates and welded to the drill rod 1 and the slag discharge pipe 2. After drilling and tapping, the purchased standard ball bearing screws are connected to achieve the required effective connection. Compared with custom-made special bearings, the manufacturing cost is low, and it can be prepared by the usual on-site steel reinforcement.

[0023] Please see Figure 2The diameters of the lower flange ring 11 and the pressure ring 4 are larger than the diameter of the horizontal flange 23. The outer edges of the lower flange ring 11 and the pressure ring 4 have abutting steps 6 that abut against each other. A connecting bolt 7 runs vertically through the lower flange ring 11, the abutting step 6, and the pressure ring 4, and the pressure ring 4 is fixedly connected to the lower flange ring 11 by bolting (the connecting bolt 7 passes through, is connected to a nut, and tightened). There is also a gap between the abutting step 6 and the outer surface of the horizontal flange 23, and a gap between the inner wall of the pressure ring 4 and the outer surface of the vertical pipe section 22, to avoid abnormal noise from sliding friction and to prevent impact on service life.

[0024] See also Figure 3 The number of connecting bolts 7 corresponds to the number of upper ball screws 5 and is circumferentially spaced, with each connecting bolt 7 and each upper ball screw 5 staggered circumferentially. In implementation, the number of lower ball screws 3 also corresponds to the number of upper ball screws 5, with a one-to-one correspondence in the vertical direction. This maintains the rolling clamping effect and ensures structural strength. In this embodiment, the number of connecting bolts 7, upper ball screws 5, and lower ball screws 3 are each six, evenly distributed.

[0025] The lower surface of the horizontal flange 23 is connected to an extension pipe section 24 coaxial with the vertical pipe section 22. The extension pipe section 24 is inserted into the central slag discharge through hole 12 of the drill rod 1. A dynamic sealing ring 8 is provided between the outer wall of the extension pipe section 24 and the inner wall of the central slag discharge through hole 12 of the drill rod 1.

[0026] Please continue reading Figure 2 In this embodiment, the upper end of the drill rod 1 is recessed and has a countersunk platform 13 coaxial with the central slag discharge through hole 12. The extension pipe section 24 is inserted into and rotatably connected to the countersunk platform 13. The dynamic sealing ring 8 is located between the outer wall of the extension pipe section 24 and the inner wall of the countersunk platform 13. The diameters of the vertical pipe section 22, the horizontal flange 23, and the inner hole of the extension pipe section 24 are all not less than the diameter of the central slag discharge through hole 12 of the drill rod 1, ensuring smooth slag discharge.

[0027] During assembly, the outer shell of the lower ball screw 3 is fully threaded and has a slotted groove at the tail end for tightening. The tail end of the lower ball screw 3 enters the internal threaded hole of the lower flange ring 11 without being exposed, thus avoiding abnormal contact that could alter the pre-adjusted rolling contact height. The tail end of the outer shell of the upper ball screw 5 is fixedly connected to an external hexagonal 51 for tightening, facilitating the adjustment of the rolling contact height of the upper ball screw 5 and the rolling contact tightness of the upper and lower ball screws 3 against the horizontal flange 23. The outer shell of the upper ball screw 5 is threaded with a tightening nut 52. After adjusting the height of the upper ball screw 5, the tightening nut 52 is rotated to tighten it against the upper surface of the pressure ring 4, thus fixing the installation height of the upper ball screw 5 relative to the pressure ring 4.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A reverse circulation drilling slag discharge rotary connection structure, comprising a drill rod and a slag discharge pipe, wherein the slag discharge pipe includes a vertical pipe section and an elbow pipe section extending and bending at the upper end of the vertical pipe section; the drill rod has a vertically penetrating central slag discharge through hole, and the upper end of the drill rod is rotatably connected to the lower end of the vertical pipe section; characterized in that: A horizontal raised edge is provided around the lower end face of the vertical pipe section; a horizontal lower flange ring is provided around the upper end face of the drill pipe, and several internal threaded holes are vertically penetrating the lower flange ring. The several internal threaded holes are arranged circumferentially on the lower flange ring, and a lower ball screw is connected to each internal threaded hole one-to-one, with the ball end of the lower ball screw facing upward; a lower ring groove is recessed on the lower surface of the horizontal raised edge, and the balls of all the lower ball screws protrude from the upper surface of the lower flange ring and roll against the lower ring groove. A pressure ring is also provided above the lower flange ring. The horizontal flange is located between the lower flange ring and the pressure ring. The pressure ring is fixedly connected to the lower flange ring. Several upper ball screws are threaded onto the pressure ring. The several upper ball screws penetrate the pressure ring vertically and are arranged circumferentially. The ball ends of the upper ball screws face downward. An upper ring groove is recessed on the upper surface of the horizontal flange. The balls of all the upper ball screws protrude from the lower surface of the pressure ring and roll against the upper ring groove.

2. The reverse circulation drilling slag removal rotary connection structure according to claim 1, characterized in that: The diameters of the lower flange ring and the pressure ring are larger than the diameter of the horizontal flange. The outer edges of the lower flange ring and the pressure ring have a ring of abutting steps that abut against each other. A connecting bolt is provided vertically through the lower flange ring, the abutting steps and the pressure ring, and the pressure ring is fixedly connected to the lower flange ring by bolting.

3. The reverse circulation drilling slag removal rotary connection structure according to claim 2, characterized in that: There is a gap between the upper surface of the lower flange ring and the lower surface of the horizontal flange, a gap between the lower surface of the pressure ring and the upper surface of the horizontal flange, a gap between the abutting step and the outer side of the horizontal flange, and a gap between the inner wall of the pressure ring and the outer side of the vertical pipe section.

4. The reverse circulation drilling slag removal rotary connection structure according to claim 2, characterized in that: The number of connecting bolts corresponds to the number of upper ball screws and is circumferentially spaced. Each connecting bolt and each upper ball screw is staggered circumferentially.

5. The rotary connection structure for reverse circulation drilling and slag removal according to claim 1, characterized in that: The lower surface of the horizontal flange is connected to an extension pipe section coaxial with the vertical pipe section. The extension pipe section is inserted into the central slag discharge through hole of the drill rod. A dynamic sealing ring is provided between the outer wall of the extension pipe section and the inner wall of the central slag discharge through hole of the drill rod.

6. The reverse circulation drilling slag removal rotary connection structure according to claim 5, characterized in that: The upper end of the drill rod is recessed and has a platform coaxial with the central slag discharge through hole. The extension pipe section is inserted into and sealed and rotatably connected to the platform.

7. The reverse circulation drilling slag removal rotary connection structure according to claim 6, characterized in that: The inner diameter of the vertical pipe section, the horizontal flange, and the extension pipe section shall not be less than the diameter of the central slag discharge through hole of the drill pipe.

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