Telescopic drill rod and drilling machine

Abstract

The utility model discloses a telescopic drill rod and a drilling machine, comprising: an outer pipe, the inner side wall of which is provided with a first inner key; the inner pipe is sleeved with the outer pipe, a pressurizing part is arranged on the outer side wall of the inner pipe, and the upper end face of the pressurizing part is used for abutting against the lower end face of the first inner key; the first end is connected with the lower end face of the outer pipe and provided with an inner arc face used for being matched with the outer side face of the pressurizing part, and a gap between the inner arc face and the outer side face of the pressurizing part is smaller than a gap between the first inner key and the outer side face of the inner pipe. The inner arc face is matched with the outer side face of the pressurizing part, the outer side face of the pressurizing part is restrained, the relative deflection amount of the outer pipe and the inner pipe is reduced, stress is dispersed to the side face of the pressurizing part, the first inner key does not make contact with the inner pipe, and the sharp corner of the first inner key is prevented from extruding and scraping the inner pipe. And the swing amount between the inner pipe and the outer pipe is reduced, so that the guide precision during drilling can be improved, and the overall hole forming perpendicularity is good. The friction distance between the first inner key and the pressurizing part is small, and the service life of the pressurizing part can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery equipment, and more specifically, to a telescopic drill rod. In addition, the utility model also relates to a drilling rig comprising the telescopic drill rod. Background Art

[0002] In the process of engineering construction, telescopic drill rods are widely used. In the prior art, the telescopic drill rod includes several drill rod sections, each of which is a hollow tubular member. Any two adjacent drill rod sections are slidably connected. For the convenience of description, one of any two adjacent drill rod sections is called an outer tube, and the other is called an inner tube. The inner tube can be slidably mounted in the outer tube, and an inner key is provided on the inner side of the outer tube. A plurality of pressurizing parts are provided on the outer periphery of the inner tube. When the inner tube slides to a preset position of the outer tube, the lower end face of the inner key abuts against the upper end face of the pressurizing part, and the downward pressure is transmitted to the pressurizing part by the lower end face of the inner key. At the same time, when the telescopic drill rod is working, the side face of the inner key is subjected to torque.

[0003] However, due to manufacturing errors or wear and tear of several pressurizing parts, it is easy for multiple pressurizing parts to be not in the same plane, resulting in relative deviation between the outer tube and the inner tube. In this case, when the telescopic drill rod rotates, the sharp corner of the inner key will hit the outside of the inner tube, squeezing and scratching the outside of the inner tube. Since the inner tube is thin, as the position of the outer side of the inner tube corresponding to the sharp corner of the inner key continues to wear, the outer side of the inner tube corresponding to the sharp corner of the inner key becomes thinner and easier to be damaged.

[0004] Therefore, how to prevent the inner key of the outer tube from causing wear to the outer side of the inner tube is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a telescopic drill rod and a drilling rig to prevent the inner key of the outer tube from causing wear to the outer side of the inner tube.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A telescopic drill rod, comprising:

[0008] an outer tube, the inner side wall of which is provided with a first inner key;

[0009] An inner tube is sleeved in the outer tube, and a pressurizing portion is provided on an outer side wall thereof, wherein an upper end surface of the pressurizing portion is used to abut against a lower end surface of the first inner key;

[0010] The first end is connected to the lower end surface of the outer tube and is provided with an inner arc surface for matching with the outer side surface of the pressurizing part. The gap between the inner arc surface and the outer side surface of the pressurizing part is smaller than the gap between the first inner key and the outer side surface of the inner tube.

[0011] Optionally, the inner side wall of the first end head is provided with a second inner key, the upper end face of the second inner key abuts against the lower end face of the first inner key, the lower end face of the second inner key is used to abut against the upper end face of the pressurizing part, and the gap between the second inner key and the outer side face of the inner tube is larger than the gap between the inner arc surface and the outer side face of the pressurizing part.

[0012] Optionally, it also includes:

[0013] The second end head is connected between the lower end face of the outer tube and the upper end face of the first end head, and the inner side wall of the second end head is provided with a third inner key, the upper end face of the third inner key abuts against the lower end face of the first inner key, and the lower end face of the third inner key is used to abut against the upper end face of the pressurizing part, and the gap between the third inner key and the outer side face of the inner tube is larger than the gap between the inner arc surface and the outer side face of the pressurizing part.

[0014] Optionally, an outer side wall of the outer tube is provided with an outer key, and the lower end of the outer key extends out of the lower end surface of the outer tube; and the first end is provided with a keyway for connecting with the outer key.

[0015] Optionally, the first end cap is welded to the outer tube.

[0016] Optionally, the second end head is welded to the outer tube and the first end head respectively.

[0017] Optionally, the external key is welded to the keyway.

[0018] A drilling rig comprises any one of the above-mentioned telescopic drill rods.

[0019] The telescopic drill rod provided by the utility model is provided with a first end head at the bottom of the outer tube. After the inner tube and the outer tube are fitted, the inner arc surface of the first end head cooperates with the outer side surface of the pressurizing part to constrain the outer side surface of the pressurizing part. Since the gap between the inner arc surface and the outer side surface of the pressurizing part is smaller than the gap between the first inner key and the outer side surface of the inner tube, even if the multiple pressurizing parts are not in the same plane due to manufacturing errors or wear and tear, when the first inner key abuts against the upper end surface of the pressurizing part, causing the outer tube and the inner tube to be relatively deflected, the constraint of the inner arc surface on the outer side surface of the pressurizing part will reduce the relative deflection of the outer tube and the inner tube, and the stress will be dispersed to the side surface of the pressurizing part, so that the first inner key does not contact the inner tube, and the sharp corner of the first inner key is avoided from squeezing and scratching the inner tube, which can greatly reduce the wear on the surface of the inner tube and make the inner tube not easy to crack. In addition, under the constraint of the inner arc surface to the outer side surface of the pressurizing part, the swing amount between the inner tube and the outer tube is reduced, thereby improving the guiding accuracy of the telescopic drill rod during drilling, so that the overall verticality of the hole is good. Furthermore, since the swing amount between the inner tube and the outer tube is small, the friction distance between the lower end surface of the first inner key and the upper end surface of the pressurizing part is small, thereby improving the service life of the pressurizing part.

[0020] The drilling rig provided by the utility model comprises the telescopic drill rod and has the same beneficial effects as the telescopic drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 A cross-sectional view of an outer tube (with a first end) of a telescopic drill rod provided in a specific embodiment of the utility model;

[0023] Figure 2 for Figure 1 a bottom view of the outer tube shown;

[0024] Figure 3 for Figure 1 A cross-sectional view of the first end;

[0025] Figure 4 for Figure 1 A bottom view of the first end;

[0026] Figure 5 A cross-sectional view of an outer tube (with a first end) of a telescopic drill rod provided in another specific embodiment of the utility model;

[0027] Figure 6 for Figure 5 a bottom view of the outer tube shown;

[0028] Figure 7 for Figure 5 A cross-sectional view of the first end;

[0029] Figure 8 for Figure 5 A bottom view of the first end;

[0030] Fig. 9 A cross-sectional view of an outer tube (with a first end and a second end) of a telescopic drill rod provided in another specific embodiment of the utility model;

[0031] Fig.10 for Fig. 9 a bottom view of the outer tube shown;

[0032] Fig.11 for Fig. 9 A cross-sectional view of the first end;

[0033] Fig.12 for Fig. 9 A bottom view of the first end;

[0034] Fig.13 for Fig. 9 A cross-sectional view of the second end;

[0035] Fig.14 for Fig. 9 A bottom view of the second end;

[0036] Fig.15 A cross-sectional view of an outer tube (with a first end) of a telescopic drill rod provided in another specific embodiment of the utility model;

[0037] Fig.16 for Fig.15 a bottom view of the outer tube shown;

[0038] Fig.17 for Fig.15 A cross-sectional view of the first end;

[0039] Fig.18 for Fig.15 A bottom view of the first end;

[0040] Fig.19 A cross-sectional view of an outer tube (with a first end) of a telescopic drill rod provided in another specific embodiment of the utility model;

[0041] Fig. 20 for Fig.19 a bottom view of the outer tube shown;

[0042] Fig.21 for Fig.19 A cross-sectional view of the first end;

[0043] Fig. 22 for Fig.19 A bottom view of the first end;

[0044] Fig.23 A cross-sectional view of an outer tube (with a first end and a second end) of a telescopic drill rod provided in another specific embodiment of the utility model;

[0045] Fig.24 for Fig.23 a bottom view of the outer tube shown;

[0046] Fig.25 for Fig.23 A cross-sectional view of the first end;

[0047] Fig.26 for Fig.23 A bottom view of the first end;

[0048] Fig. 27 for Fig.23 A cross-sectional view of the second end;

[0049] Fig.28 for Fig.23 A bottom view of the second end;

[0050] Fig.29 It is a cross-sectional view of the inner tube being lowered when the inner tube and the outer tube are assembled;

[0051] Fig.30 A cross-sectional view when the pressurizing portion reaches a preset distance below the first inner key when the inner tube and the outer tube are assembled;

[0052] Fig.31 It is a cross-sectional view when the inner tube is rotated until the pressurizing portion is aligned with the first inner key during assembly of the inner tube and the outer tube;

[0053] Fig.32 It is a cross-sectional view when the lower end surface of the first inner key is in contact with the upper end surface of the pressurizing portion when the inner tube and the outer tube are assembled;

[0054] Fig.33 for Fig.32 A partial enlarged view of middle A.

[0055] Figures 1 to 33 The reference numerals in the figures are as follows:

[0056] 1 is an outer tube, 11 is a first inner key, 12 is an outer key, 2 is an inner tube, 21 is a pressurizing portion, 3 is a first end head, 31 is an inner arc surface, 32 is a second inner key, 33 is a keyway, 4 is a second end head, and 41 is a third inner key. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0058] The core of the utility model is to provide a telescopic drill rod to prevent the inner key of the outer tube 1 from wearing the outer side of the inner tube 2. Another core of the utility model is to provide a drilling rig including the telescopic drill rod, which has the same beneficial effects as the telescopic drill rod.

[0059] Please combine Figures 1 to 33The embodiment of the utility model provides a telescopic drill rod, including an inner tube 2, an outer tube 1 and a first end head 3, the inner tube 2 is sleeved in the outer tube 1, and the outer side wall of the inner tube 2 is provided with a pressurizing portion 21; the inner side wall of the outer tube 1 is provided with a first inner key 11, and the lower end surface of the first inner key 11 is used to abut against the upper end surface of the pressurizing portion 21; the first end head 3 is connected to the lower end surface of the outer tube 1, and the first end head 3 is provided with an inner arc surface 31, which is used to cooperate with the outer side surface of the pressurizing portion 21, and the gap between the inner arc surface 31 and the outer side surface of the pressurizing portion 21 is smaller than the gap between the first inner key 11 and the outer side surface of the inner tube 2.

[0060] That is to say, in the embodiment of the utility model, a first end head 3 is added to the bottom of the outer tube 1. After the inner tube 2 and the outer tube 1 are fitted, the inner arc surface 31 of the first end head 3 cooperates with the outer side surface of the pressurizing portion 21 to constrain the outer side surface of the pressurizing portion 21. Since the gap between the inner arc surface 31 and the outer side surface of the pressurizing portion 21 is smaller than the gap between the first inner key 11 and the outer side surface of the inner tube 2, even if the multiple pressurizing portions 21 are not in the same plane due to manufacturing errors or wear and tear, when the first inner key 11 abuts against the upper end surface of the pressurizing portion 21, causing the outer tube 1 and the inner tube 2 to be relatively deflected, the constraint of the inner arc surface 31 on the outer side surface of the pressurizing portion 21 will reduce the relative deflection of the outer tube 1 and the inner tube 2, and disperse the stress to the side surface of the pressurizing portion 21, so that the first inner key 11 does not contact the inner tube 2, and the sharp corners of the first inner key 11 are prevented from squeezing and scratching the inner tube 2, which can greatly reduce the surface wear of the inner tube 2 and make the inner tube 2 less likely to crack. In addition, under the constraint of the inner arc surface 31 on the outer side surface of the pressurizing part 21, the swing amount between the inner tube 2 and the outer tube 1 is reduced, thereby improving the guiding accuracy of the telescopic drill rod during drilling, so that the overall verticality of the hole is good. Furthermore, since the swing amount between the inner tube 2 and the outer tube 1 is small, the friction distance between the lower end surface of the first inner key 11 and the upper end surface of the pressurizing part 21 is small, thereby improving the service life of the pressurizing part 21.

[0061] It should be noted that, in the embodiment of the utility model, the telescopic drill rod may include multiple outer tubes 1 and multiple inner tubes 2, any adjacent outer tubes 1 and inner tubes 2 form a telescopic unit, and the telescopic drill rod includes at least one such telescopic unit. In addition, the outer tube 1 and the inner tube 2 are relative concepts, that is, in two adjacent telescopic units, the outer tube 1 of the first telescopic unit may be the inner tube 2 of the second telescopic unit.

[0062] During construction, add outer pipe 1 and / or inner pipe 2 as needed, such as Figure 29-Figure 32 , shows the installation process of the outer tube 1 and the inner tube 2. First, as Fig.29As shown, the inner tube 2 is lowered so that the inner tube 2 falls into the outer tube 1. At this time, the pressurizing portion 21 is staggered with the first inner key 11 to avoid interference between the first inner key 11 and the pressurizing portion 21, so that the inner tube 2 cannot be lowered into the outer tube 1. When the pressurizing portion 21 reaches a preset distance below the first inner key 11 (such as Fig.30 Then, the inner tube 2 is rotated to a certain angle so that the pressurizing portion 21 is aligned with the first inner key 11 (as shown in FIG. Fig.31 Then, the outer tube 1 is lowered by a preset distance so that the lower end surface of the first inner key 11 fits with the upper end surface of the pressurizing portion 21 (as shown in FIG. Fig.32 and 33 shown).

[0063] In addition, since the lower end surface of the first inner key 11 is in contact with the upper end surface of the pressurizing part 21, and the first inner key 11 and the inner wall of the outer tube 1 are usually welded, stress concentration is likely to occur at the connection. When the telescopic drill rod rotates, the friction between the first inner key 11 and the pressurizing part 21 is likely to cause the first inner key 11 to crack. To solve this technical problem, please refer to Figures 5 to 8 In some embodiments, a second inner key 32 is provided on the inner wall of the first end head 3, the upper end surface of the second inner key 32 abuts against the lower end surface of the first inner key 11, the lower end surface of the second inner key 32 is used to abut against the upper end surface of the pressurizing part 21, and the gap between the second inner key 32 and the outer side surface of the inner tube 2 is larger than the gap between the inner arc surface 31 and the outer side surface of the pressurizing part 21.

[0064] That is to say, in this embodiment, a second inner key 32 is added to the inner side wall of the first end 3, so that the second inner key 32 plays the role of connecting the first inner key 11 and the pressurizing part 21, that is, to avoid the lower end face of the first inner key 11 directly contacting the upper end face of the pressurizing part 21, and the second inner key 32 transmits the downward pressure to the pressurizing part 21, so that the force of the first inner key 11 can be optimized and the risk of cracking can be reduced. In addition, since the second inner key 32 is shorter than the first inner key 11 and is easy to process, the second inner key 32 can be directly processed on the inner wall of the first end 3, which can reduce stress concentration and avoid cracking of the second inner key 32 compared to welding. Of course, if the second inner key 32 is welded to the first end 3, when the second inner key 32 cracks, the reliability of the first end 3 can also be determined by replacing the first end 3. It can be understood that the gap between the second inner key 32 and the outer side surface of the inner tube 2 is larger than the gap between the inner arc surface 31 and the outer side surface of the pressurizing portion 21, which can prevent the sharp corners of the second inner key 32 from squeezing and scratching the outer side surface of the inner tube 2.

[0065] It can be seen that in this embodiment, the inner arc surface 31 and the second inner key 32 are both provided on the first end 3, so that the first end 3 has more structural features and the processing is slightly complicated. In order to facilitate the processing, in other embodiments, it can also be such a scheme: Figures 9 to 14As shown, the telescopic drill rod also includes a second end head 4, which is connected between the lower end face of the outer tube 1 and the upper end face of the first end head 3, and the inner side wall of the second end head 4 is provided with a third inner key 41, the upper end face of the third inner key 41 abuts against the lower end face of the first inner key 11, and the lower end face of the third inner key 41 is used to abut against the upper end face of the pressurizing part 21, and the gap between the third inner key 41 and the outer side face of the inner tube 2 is larger than the gap between the inner arc surface 31 and the outer side face of the pressurizing part 21.

[0066] That is to say, in this embodiment, by adding the second end head 4, the second end head 4 plays the role of connecting the first end head 3 and the outer tube 1, that is, the upper end face of the second end head 4 is connected to the lower end face of the outer tube 1, and the lower end face of the second end head 4 is connected to the upper end face of the first end head 3; at the same time, a third inner key 41 is provided on the inner side wall of the second end head 4, so that the third inner key 41 plays the role of connecting the first inner key 11 and the pressurizing part 21, that is, the lower end face of the first inner key 11 is prevented from directly contacting the upper end face of the pressurizing part 21, and the downward pressure is transmitted to the pressurizing part 21 by the third inner key 41, so that the force of the first inner key 11 can be optimized and the risk of cracking can be reduced. In addition, since the third inner key 41 is shorter than the first inner key 11 and is easy to process, the third inner key 41 can be directly processed on the inner wall of the second end head 4, which can reduce stress concentration and avoid cracking of the third inner key 41 compared with welding. Of course, if the third inner key 41 is welded to the second end 4, when the third inner key 41 is cracked, the reliability of the second end 4 can be determined by replacing the second end 4. It can be understood that the gap between the third inner key 41 and the outer side of the inner tube 2 is larger than the gap between the inner arc surface 31 and the outer side of the pressurizing portion 21, which can prevent the sharp corner of the third inner key 41 from squeezing and scraping the outer side of the inner tube 2.

[0067] In addition, if Figures 15 to 28 As shown, in some embodiments, the outer wall of the outer tube 1 is provided with an outer key 12, and the lower end of the outer key 12 extends out of the lower end surface of the outer tube 1; the first end head 3 is provided with a key groove 33 for connecting with the outer key 12. That is to say, in this embodiment, the outer key 12 is not only provided on the outer wall of the outer tube 1, but also connected to the key groove 33 of the first end head 3, and the key groove 33 of the first end head 3 and the outer tube 1 simultaneously limit the outer key 12, which can reduce the risk of the outer key 12 being torn at the lower end of the outer tube 1.

[0068] It should be noted that, when the telescopic drill rod further includes the second end 4, in order to enable the external key 12 to be connected to the keyway 33 of the first end 3, the outer diameter of the second end 4 must be less than or equal to the outer diameter of the outer tube 1, so as to avoid the external key 12 and enable the external key 12 to extend to the keyway 33 of the first end 3. Of course, in other embodiments, the outer side of the second end 4 may also be provided with a keyway 33 for connecting the external key 12, that is, the external key 12 is not only provided on the outer side wall of the outer tube 1, but also connected to the keyways 33 of the second end 4 and the first end 3, so that the external key 12 is fixed more firmly and reliably, and prevented from being torn.

[0069] It should be noted that, in the above-mentioned embodiments, the connection method between the first end head 3 and the outer tube 1 is not limited. Considering the reliability of the connection, in some embodiments, the first end head 3 is welded to the outer tube 1. It can be understood that the welding of the first end head 3 and the outer tube 1 can ensure that the connection between the first end head 3 and the outer tube 1 has a higher connection strength, thereby improving the reliability of the connection between the two.

[0070] In addition, when the telescopic drill rod further includes a second end 4, the above embodiment does not limit the connection method of the second end 4 with the outer tube 1 and the first end 3, respectively. In some embodiments, the second end 4 is welded to the outer tube 1 and the first end 3. That is, the second end 4 is connected to the outer tube 1 and the first end 3 by welding, which can improve the connection strength between the second end 4 and the outer tube 1 and the second end 4 and the first end 3, and improve the structural reliability.

[0071] Furthermore, in order to ensure the connection strength between the outer key 12 and the key slot 33 , in some embodiments, the outer key 12 and the key slot 33 are welded.

[0072] In addition to the telescopic drill rod, the utility model also provides a drilling rig including the telescopic drill rod disclosed in the above embodiment. For the structures of other parts of the drilling rig, please refer to the prior art and will not be described in detail herein.

[0073] The key point of this embodiment is that the telescopic drill rod disclosed in the above embodiment has the same beneficial effects as the above telescopic drill rod.

[0074] It should also be noted that, in this specification, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0075] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0076] The telescopic drill rod and drilling rig provided by the utility model are introduced in detail above. The principle and implementation method of the utility model are explained in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A telescopic drill rod, characterized in that: include: An outer tube (1) having an inner wall provided with a first inner key (11); An inner tube (2) is sleeved inside the outer tube (1), and an outer side wall thereof is provided with a pressurizing portion (21), and an upper end surface of the pressurizing portion (21) is used to abut against a lower end surface of the first inner key (11); The first end head (3) is connected to the lower end surface of the outer tube (1) and is provided with an inner arc surface (31) for matching with the outer side surface of the pressurizing portion (21), and the gap between the inner arc surface (31) and the outer side surface of the pressurizing portion (21) is smaller than the gap between the first inner key (11) and the outer side surface of the inner tube (2).

2. The telescopic drill rod according to claim 1, characterized in that: The inner side wall of the first end head (3) is provided with a second inner key (32), the upper end surface of the second inner key (32) abuts against the lower end surface of the first inner key (11), the lower end surface of the second inner key (32) is used to abut against the upper end surface of the pressurizing portion (21), and the gap between the second inner key (32) and the outer side surface of the inner tube (2) is larger than the gap between the inner arc surface (31) and the outer side surface of the pressurizing portion (21).

3. The telescopic drill rod according to claim 1, characterized in that: Also includes: The second end head (4) is connected between the lower end face of the outer tube (1) and the upper end face of the first end head (3); the inner side wall of the second end head (4) is provided with a third inner key (41); the upper end face of the third inner key (41) abuts against the lower end face of the first inner key (11); the lower end face of the third inner key (41) is used to abut against the upper end face of the pressurizing portion (21); the gap between the third inner key (41) and the outer side face of the inner tube (2) is larger than the gap between the inner arc surface (31) and the outer side face of the pressurizing portion (21).

4. The telescopic drill rod according to any one of claims 1 to 3, characterized in that: The outer wall of the outer tube (1) is provided with an external key (12), the lower end of the external key (12) protruding from the lower end surface of the outer tube (1); the first end head (3) is provided with a keyway (33) for connecting with the external key (12).

5. The telescopic drill rod according to claim 1 or 2, characterized in that: The first end cap (3) is welded to the outer tube (1).

6. The telescopic drill rod according to claim 3, characterized in that: The second end cap (4) is welded to the outer tube (1) and the first end cap (3) respectively.

7. The telescopic drill rod according to claim 4, characterized in that: The external key (12) is welded to the keyway (33).

8. A drilling rig, characterized in that: The invention comprises the telescopic drill rod as described in any one of claims 1 to 7.

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