Impact-resistant down-the-hole drill head and down-the-hole drill using the floating head

Abstract

This invention provides an impact-resistant floating head for down-the-hole (DH) drills and a DH drill using the floating head. The floating head includes a rotary head and a floating head. The floating head comprises a flange joint, an internal gear ring, an external spline shaft, and a floating hollow tube. One end of the flange joint has a tapered external thread, which is screwed into the output shaft of the rotary head for connection. The other end has a flange mounting plate, which is integrally connected to the internal gear ring. The internal gear ring is hollow, and the external spline shaft slides inside it. The floating hollow tube is installed in the inner holes of the flange joint and the external spline shaft to prevent high-pressure gas from leaking out from the flange mating surface. This invention provides bidirectional buffering, and the spline drive also offers advantages such as high torque transmission and long service life. Installing a floating head on the rotary head significantly protects it from damage caused by strong impacts.

Description

Technical Field

[0001] This utility model relates to the field of down-the-hole drilling rigs, specifically an impact-resistant floating head for down-the-hole drilling rigs. Background Technology

[0002] Down-the-hole (DH) drills are currently the most widely used drilling machines in open-pit mining both domestically and internationally. The DH rig's feed beam mainly consists of the beam body, chain drive system, slewing head, and rod changing system. The slewing head is fixed to the feed beam, and its movement provides the rotational power required for drilling operations.

[0003] The rotary head output shaft is directly connected to the drill rod, transmitting torque. When changing drill rods on a down-the-hole drill rig, the rotary head reverses and slowly lifts until the threads are completely disengaged. During this process, if the relative speeds of the reverse and slow lifting actions are not matched, significant friction and pushing / pulling forces will occur between the internal threads of the output shaft and the external threads of the drill rod. Over time, this will damage both the internal threads of the rotary head output shaft and the external threads of the drill rod. Under these conditions, even with the addition of an adapter (i.e., an intermediate threaded shaft between the rotary head and the drill rod), only the threads of the rotary head output shaft can be protected; the negative impact of speed mismatch on the drill rod threads during disassembly cannot be eliminated. Furthermore, during drilling, the reaction force generated by the impact load on the drill bit is transmitted to the drill rig body through the impactor, drill rod, rotary head, and feed beam. This massive impact load will affect the service life of the rotary head and increase maintenance costs.

[0004] The impact loads experienced by down-the-hole drills during drilling reduce the service life of the rotary head and other structural components. A simple rigid connection adapter (the hollow connecting shaft between the rotary head and the drill rod) only protects the internal threads of the rotary head's output shaft. Therefore, a floating device connecting the rotary head and the drill rod needs to be designed to eliminate the impact of speed mismatch on the threads during rod disassembly, and simultaneously reduce the reaction force of impact loads during drilling operations, thus protecting the rotary head. Utility Model Content

[0005] To address the problems of existing technologies, this invention provides a design combining spline drive and end-face shock absorber, offering bidirectional buffering. The spline drive also boasts advantages such as high torque transmission and long service life. Installing a floating head on the rotary head significantly protects it from damage caused by strong impacts. Furthermore, the design considers the overall dimensions and installation interface requirements of the floating head, achieving practicality and versatility.

[0006] This utility model provides an impact-resistant floating head for a down-the-hole drill rig, comprising a down-the-hole drill rig, a rotary head, and a floating head. One end of the floating head is connected to the rotary head, and the other end is connected to the drill rod of the down-the-hole drill rig. The floating head includes a flange joint, an internal gear ring, an external gear spline shaft, and a floating hollow tube. One end of the flange joint has a tapered external thread, which is screwed into the output shaft of the rotary head to connect with the rotary head. The other end has a flange mounting plate, which is integrated with the internal gear ring of the floating head. The internal gear ring of the floating head has a hollow structure, and the external gear spline shaft slides inside the internal gear ring. Both ends of the external gear spline shaft are limited by a first damping pad and a second damping pad, respectively. The floating hollow tube is installed in the inner holes of the flange joint and the external gear spline shaft, and passes through the center of the first damping pad. The outer end face of the floating hollow tube and the inner end face of the flange joint and the external gear spline shaft are equipped with bidirectional pneumatic sealing rings, allowing high-pressure gas in the floating head to leak out from the flange mating surface.

[0007] In a further improvement, the flange mounting plate of the flange joint is connected to the internal gear ring of the floating head as a whole by mounting bolts, spring washers and nuts.

[0008] In a further improvement, the external spline shaft is connected to the internal gear ring of the floating head via an external spline, and the spline width of the external spline shaft is shorter than the spline width of the internal gear ring of the floating head, with the extra width representing the floating distance of the floating head. When the external spline shaft slides within the internal gear ring of the floating head, its two extreme positions are respectively the first damping pad and the second damping pad. As the spline shaft slides up and down along the internal gear ring of the floating head, the first damping pad at the left end and the second damping pad at the right end can effectively reduce the rigid contact and impact generated during this process.

[0009] Further improvements include the following: From the inside to the outside, a support ring, a sealing ring, and a dustproof ring are sequentially installed on the left end mating ring surface of the floating head's internal gear ring and external gear spline shaft. The two support rings provide support to the right end of the spline shaft while preventing direct contact and friction between the spline shaft and the internal gear ring, thus providing protection. The sealing ring is installed outside the support rings to prevent grease from leaking along the outer end face of the spline shaft from the spline cavity and support rings. The outermost dustproof ring prevents external dust, sand, and other contaminants from entering the oil seal, thus avoiding damage. Grease fittings are provided on the outer edges of the spline, support rings, and oil seal for easy grease application and maintenance.

[0010] This utility model also provides a down-the-hole drill rig, including a drill rod and the aforementioned impact-resistant down-the-hole drill rig floating head, wherein the drill rod is connected to the floating head in the impact-resistant down-the-hole drill rig floating head.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. It solves the problem that the output end of the current domestic rotary head only has an adapter and cannot buffer and reduce shock. The shock-absorbing pad at the extreme position of the bidirectional floating end of the spline can effectively reduce the reaction force of the impact load generated during drilling operations, and at the same time protect the drill rod thread during the disassembly process.

[0013] 2. The floating head is installed between the drill rod and the rotary head, which effectively protects the rotary head, extends its service life, enhances the stability of the whole machine during drilling operations, and improves drilling accuracy.

[0014] 3. The floating head can directly replace the original adapter on the drilling rig, making it convenient for installation, disassembly, maintenance and upkeep. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the floating head installation;

[0017] Figure 2 A schematic diagram of the floating head assembly;

[0018] Figure 3 This is an exploded view of the floating head.

[0019] In the diagram, 1-rotary head, 2-floating head, 3-flange joint, 4-floating head internal gear ring, 5-first damping pad, 6-external gear spline shaft, 7-second damping pad, 8-mounting bolt, 9-spring washer, 10-nut, 11-grease nipple, 12-dust cap, 13-floating hollow tube, 14-bidirectional pneumatic seal ring, 15-support ring, 16-seal ring, 17-dust ring, 18-washer, 19-plug. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] This utility model provides an impact-resistant floating head for down-the-hole drills, such as... Figure 1As shown, the system includes a down-the-hole drill rig, a rotary head 1, and a floating head 2. One end of the floating head is connected to the rotary head, and the other end is connected to the drill rod of the down-the-hole drill rig. When connecting and disconnecting the drill rod on the down-the-hole drill rig, the floating head 2 protects the drill rod threads through the spline sliding mechanism in the middle. During drilling, the shock-absorbing pads at both ends of the spline inside the floating head reduce the impact load on the rotary head, effectively improving the service life of the rotary head.

[0022] The floating head is as follows Figure 2 and Figure 3 As shown, the device includes a flange connector 3, a floating head internal gear ring 4, an external gear spline shaft 6, and a floating hollow tube 13. One end of the flange connector 3 is a tapered tube with an external thread, which is screwed into the output shaft of the rotary head 1 to connect with the rotary head 1. The other end is a flange mounting plate, which is connected to the floating head internal gear ring 4 as a whole through a washer 18 and a plug 19. The floating head internal gear ring 4 is a hollow structure, and the external gear spline shaft 6 slides inside the floating head internal gear ring. The two ends of the external gear spline shaft are limited by a first damping pad 5 and a second damping pad 7, respectively. The floating hollow tube 13 is installed in the inner holes of the flange connector 3 and the external gear spline shaft 6, and passes through the center of the first damping pad 5. The outer end face of the floating hollow tube 13 and the inner end faces of the flange connector 3 and the external gear spline shaft 6 are both equipped with bidirectional pneumatic sealing rings 14 to prevent high-pressure gas in the floating head from leaking out from the flange mating surface. The grease nipple 11 is installed on the internal gear ring 4 of the floating head via a threaded connection. The positions on number 4 are the outer edges of the spline, support ring, and oil seal, respectively. Grease is added to the external gear spline shaft 6, support ring 15, and plug 19 through the grease nipple 11 to lubricate and maintain them. The dust cap 12 is installed on the outer end of the grease nipple to protect it from external contamination.

[0023] The flange mounting plate of the flange joint 3 is connected to the floating head internal gear ring 6 as a whole by mounting bolts 8, spring washers 9 and nuts 10.

[0024] The external spline shaft 6 is connected to the internal gear ring 4 of the floating head via an external spline. The spline width of the external spline shaft 6 is shorter than the spline width of the internal gear ring 4 of the floating head, and the extra width is the floating distance of the floating head. When the external spline shaft slides in the internal gear ring of the floating head, the extreme positions at both ends are the first damping pad 5 and the second damping pad 7, respectively. When the spline shaft slides up and down along the internal gear ring of the floating head, the first damping pad 5 at the left end and the second damping pad 7 at the right end can effectively reduce the rigid contact and impact generated during this process.

[0025] From the inside to the outside, a support ring 15, a sealing ring 16, and a dustproof ring 17 are sequentially installed on the left end mating ring surface of the floating head internal gear ring 4 and the external gear spline shaft 6. The two support rings 15 support the right end of the spline shaft and prevent direct contact and friction between the spline shaft and the internal gear ring, thus providing protection. The sealing ring 16 is installed outside the support rings to prevent grease from leaking along the outer end face of the spline shaft from the spline cavity and support rings. The outermost dustproof ring 17 prevents external dust, sand, and other contaminants from entering the oil seal, thus avoiding damage. Grease fittings are provided on the outer edges of the spline, support rings, and oil seal for easy grease application and maintenance.

[0026] This utility model also provides a down-the-hole drill rig, including a drill rod and an impact-resistant floating head, wherein the drill rod is connected to the floating head in the impact-resistant down-the-hole drill rig floating head.

[0027] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, for the device embodiments, the above descriptions are merely preferred embodiments of this utility model. Since they are fundamentally similar to the method embodiments, the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments. The above descriptions are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model, without departing from the principle of this utility model, should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A percussion-resistant roof bolter floating head, characterized by: The system includes a down-the-hole drill rig, a rotary head, and a floating head. One end of the floating head is connected to the rotary head, and the other end is connected to the drill rod of the down-the-hole drill rig. The floating head includes a flange joint, an internal gear ring, an external spline shaft, and a floating hollow tube. One end of the flange joint has a tapered external thread, which is screwed into the output shaft of the rotary head to connect with it. The other end has a flange mounting plate, which is integrated with the internal gear ring of the floating head. The internal gear ring of the floating head has a hollow structure, and the external spline shaft slides inside the internal gear ring. Both ends of the external spline shaft are limited by a first damping pad and a second damping pad, respectively. The floating hollow tube is installed in the inner holes of the flange joint and the external spline shaft, and passes through the center of the first damping pad. The outer end face of the floating hollow tube and the inner end face of the flange joint and the external spline shaft are equipped with bidirectional pneumatic sealing rings to prevent high-pressure gas in the floating head from leaking out from the flange mating surface.

2. A percussion-resistant roof bolter floating head as claimed in claim 1, characterized in that: The flange mounting plate of the flange joint is connected to the internal gear ring of the floating head as a whole by mounting bolts, spring washers and nuts.

3. The impact-resistant roof bolter floating head of claim 1, wherein: The external spline shaft is connected to the internal gear ring of the floating head via an external spline, and the spline width of the external spline shaft is shorter than the spline width of the internal gear ring of the floating head, with the extra width being the floating distance of the floating head.

4. The impact-resistant roof bolter floating head of claim 1, wherein: The floating head internal gear ring and the left end of the external gear spline shaft are fitted with a support ring, a sealing ring and a dustproof ring in sequence from the inside to the outside.

5. A raise boring machine characterized by: It includes a drill pipe and an impact-resistant down-the-hole drill floating head as described in any one of claims 1-4, wherein the drill pipe is connected to the floating head in the impact-resistant down-the-hole drill floating head.

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