A dual-output-shaft trenchless directional drilling rig power device and a matching drill rod

Abstract

The present invention discloses a dual-output-shaft trenchless directional drilling rig power device and a drill rod used in conjunction therewith, and relates to the field of drilling rigs. The technical solution thereof mainly comprises a housing, a first driving device arranged inside the housing, a second driving device arranged inside the housing, a first output shaft driven to rotate by the first driving device, and a second output shaft driven to rotate by the second driving device; the second output shaft is arranged inside the first output shaft, the axes of the two coincide and can rotate relative to each other; it comprises an outer rod and a connecting rod, the connecting rod passes through the outer rod and can rotate inside the outer rod; an inclined portion is arranged at one end of the outer rod away from the power device, and an angle is formed between the inclined portion and the outer rod; an end of the connecting rod close to the inclined portion extends out of the inclined portion and is fixed with a roller drill bit. The present invention has the effect of facilitating drilling of relatively hard soil layers or soil layers with more stones.

Description

Technical Field

[0001] The invention relates to the field of drilling rigs, and in particular to a power device for a double-output-shaft trenchless directional drilling rig and a matching drill rod. Background Art

[0002] Trenchless horizontal directional drilling rigs use directional drill rods to carry out underground construction while excavating a very small part of the ground. This type of construction equipment will not hinder traffic, damage green spaces and vegetation, or affect the normal life and work order of shops, hospitals, schools and residents, thus solving the problem of interference of traditional excavation construction with residents' lives.

[0003] In the prior art, the frontmost drill rod of a general trenchless horizontal drilling rig adopts an asymmetric drill bit, and the working principle is: when the drill bit rotates at a constant speed, the soil pressure on the drill bit changes evenly along the circumference, so the trajectory is basically straight drilling; when the drill rod only feeds and does not rotate, the soil pressure on the drill bit slope is relatively large, and the trajectory is usually along the direction of the drill bit slope, changing the forward trajectory. However, when this drill rod encounters a relatively hard soil layer or there are many stones in the soil layer, it is difficult for traditional drilling rigs and drill rods to drill holes in this situation. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a dual-output shaft trenchless directional drilling rig power device, which is convenient for driving the rotation of the drill rod for drilling holes in hard soil layers or soil layers with many stones.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a dual-output shaft trenchless directional drilling rig power unit, comprising a housing, a first drive device arranged inside the housing, a second drive device arranged inside the housing, a first output shaft driven for rotation by the first drive device, and a second output shaft driven for rotation by the second drive device; the second output shaft is arranged inside the first output shaft, the axes of the two coincide and can rotate relative to each other.

[0006] By adopting the above technical solution, the first output shaft is driven to rotate by the first driving device and is threadedly connected to the outer rod of the drill rod, and the second output shaft is driven to rotate by the second driving device and is threadedly connected to the connecting rod; the first output shaft and the second output shaft rotate independently, which is convenient for driving the drill rod to rotate.

[0007] The present invention is further configured as follows: the second output shaft includes a fixed part driven to rotate by a second driving device, a sliding part slidably connected to the fixed part, and an elastic member driving the sliding part to move in a direction away from the fixed part; an outer wall of the fixed part close to one end of the sliding part is provided with an external spline, and an inner wall of the sliding part close to one end of the fixed part is provided with an internal spline meshing with the external spline.

[0008] By adopting the above technical solution, when encountering a harder soil layer or a soil layer with more stones during the forward process, the forward speed will suddenly slow down, and the buffer component provides a buffer stroke to drive the sliding part to slide toward the fixed part, thereby reducing the stress on the second output shaft and protecting the second output shaft.

[0009] The present invention is further configured as follows: a limiting block is fixed on the outer side of the sliding portion close to one end of the fixed portion, and a sliding groove for the limiting block to slide is provided on the inner wall of the first output shaft.

[0010] By adopting the above technical solution, the sliding of the limit block in the slide groove can prevent the sliding part from being too far away from the fixed part, thereby increasing the working stability of the second output shaft.

[0011] The present invention is further configured as follows: the first driving device and the second driving device are driven by gears, and the gears used are helical gears.

[0012] By adopting the above technical solution, the helical gear has the advantages of smooth transmission, less impact, vibration and noise, and is suitable for high-speed and heavy-load occasions.

[0013] The present invention is further configured as follows: two sides of the gears of the first drive device and the second drive device are abutted with radial bearings, and the other side of the radial bearing is abutted with the housing.

[0014] By adopting the above technical solution, the radial bearing limits the gear to prevent the gear from sliding during rotation, thereby increasing the stability of the gear rotation.

[0015] Another object of the present invention is to provide a drill rod that is convenient for drilling holes in harder soil layers or soil layers with more stones.

[0016] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a drill rod, comprising an outer rod and a connecting rod, the connecting rod passes through the outer rod and can rotate inside the outer rod; an inclined portion is provided at one end of the outer rod away from the power device, and an angle is formed between the inclined portion and the outer rod; an end of the connecting rod close to the inclined portion extends out of the inclined portion and is fixed with a roller drill bit.

[0017] By adopting the above technical solution, the outer rod and the connecting rod rotate at the same time, the outer rod rotates at a constant speed, and the soil pressure on the roller drill bit changes evenly along the circumference, so the trajectory is basically straight drilling. When the outer rod stops rotating, the roller drill bit is subjected to greater soil pressure along the inclined portion, and the roller drill bit moves forward in the direction of the inclined portion; when moving forward in a straight line, the roller drill bit can break the hard soil layer or the soil layer with more stones in front, thereby facilitating its advancement.

[0018] The present invention is further configured as follows: a probe cavity is formed on the outer wall of the outer rod, and a probe is placed in the probe cavity.

[0019] By adopting the above technical solution, the probe can emit radio waves and cooperate with the detection equipment on the ground to understand the position of the drill bit in real time.

[0020] The present invention is further configured as follows: a cover plate is provided on the probe cavity, the cover plate is connected to the outer rod by bolts, and the probe cavity can be sealed.

[0021] By adopting the above technical solution, the cover plate protects the probe cavity and the probe, reducing damage during the drilling process.

[0022] In summary, the beneficial technical effects of the present invention are:

[0023] 1. The outer rod and the connecting rod rotate at the same time, the outer rod rotates at a constant speed, and the soil pressure on the roller drill bit changes evenly along the circumference, so the trajectory is basically straight drilling. When the outer rod stops rotating, the roller drill bit is subjected to greater soil pressure along the inclined part, and the roller drill bit moves forward in the direction of the inclined part; when moving forward in a straight line, the roller drill bit can break the hard soil layer or the soil layer with more stones in front, thereby facilitating its advancement;

[0024] 2. The first output shaft is driven to rotate by the first driving device and is threadedly connected to the outer rod of the drill rod. The second output shaft is driven to rotate by the second driving device and is threadedly connected to the connecting rod. The first output shaft and the second output shaft rotate independently, which is convenient for driving the drill rod to rotate.

[0025] 3. When encountering a harder soil layer or a soil layer with more stones during the forward movement, the forward speed will suddenly slow down. The buffer member provides a buffer stroke to drive the sliding part to slide toward the fixed part, thereby reducing the stress on the second output shaft and protecting the second output shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the power device of the embodiment;

[0027] Figure 2 is a cross-sectional view of a power device of an embodiment;

[0028] Figure 3 A schematic diagram showing the structure of the first driving device;

[0029] Figure 4 A schematic diagram showing the structure of the second driving device;

[0030] Figure 5 for Figure 2 A magnified view of part A;

[0031] Figure 6 is an exploded view of the second output shaft;

[0032] Figure 7It is a structural schematic diagram of a drill rod according to an embodiment.

[0033] In the figure: 1. housing; 2. first driving device; 21. first gear; 211. spline; 22. second gear; 23. third gear; 24. first rotating shaft; 3. second driving device; 31. fourth gear; 32. fifth gear; 33. second rotating shaft; 4. first output shaft; 41. slide groove; 5. second output shaft; 51. fixing part; 511. external spline; 52. sliding part; 521. internal spline; 522. limit block; 53. spring; 54. placement cavity; 6. radial bearing; 7. outer rod; 71. probe rod cavity; 72. probe rod; 73. cover plate; 74. inclined part; 8. connecting rod; 81. roller drill bit. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0035] Embodiment: A dual output shaft trenchless directional drilling rig power unit, see Figure 1 , comprising a housing 1, a first driving device 2 disposed inside the housing 1, a second driving device 3 disposed inside the housing 1, a first output shaft 4 driven to rotate by the first driving device 2, and a second output shaft 5 driven to rotate by the second driving device 3. The second output shaft 5 is disposed inside the first output shaft 4, the axes of the two coincide, and they can rotate relative to each other.

[0036] See also Figure 2 and Figure 3 The first driving device 2 includes a first gear 21 rotatably connected to the inside of the housing 1, a second gear 22 rotatably connected to the inside of the housing 1 and meshing with the first gear 21, a third gear 23 rotatably connected to the inside of the housing 1 and meshing with the second gear 22, and a first rotating shaft 24 passing through the third gear 23 and having an axis coinciding with the third gear 23.

[0037] A spline 211 is fixed on one side of the first gear 21, and the spline 211 is connected to the driving device (generally a motor and a reducer), thereby driving the first gear 21 to rotate. The first rotating shaft 24 is fixedly connected to the first output shaft 4, and the splines between the third gear 23 and the first rotating shaft 24 are matched, so that the transmission of the third gear 23 can be transmitted to the first rotating shaft 24, thereby realizing that the first driving device 2 drives the first output shaft 4 to rotate.

[0038] The first gear 21, the second gear 22 and the third gear 23 are all helical gears, which have the advantages of stable transmission, low impact, vibration and noise, and are suitable for high-speed and heavy-load occasions. The first gear 21, the second gear 22 and the third gear 23 are both abutted with radial bearings 6 on both sides, and the other side of the radial bearings 6 is abutted with the housing 1 to increase the stability of the gear placement.

[0039] join Figure 2 and Figure 4 The second driving device 3 includes a fourth gear 31 rotatably connected to the inside of the housing 1, a fifth gear 32 rotatably connected to the inside of the housing 1 and meshing with the fourth gear 31, and a second rotating shaft 33 that passes through the fifth gear 32 and coincides with the axis of the fifth gear 32.

[0040] The fourth gear 31 is connected to a driving device (generally a motor and a reducer), thereby driving the fourth gear 31 to rotate. The second rotating shaft 33 is fixedly connected to the second output shaft 5, and the fifth gear 32 and the second rotating shaft 33 are splined, so that the rotation of the fifth gear 32 is transmitted to the second output shaft 5, thereby realizing that the second driving device 3 drives the second output shaft 5 to rotate.

[0041] The fourth gear 31 and the fifth gear 32 are both helical gears, which have the advantages of smooth transmission, low impact, vibration and noise, and are suitable for high-speed and heavy-load occasions. Both sides of the fourth gear 31 and the fifth gear 32 are abutted with radial bearings 6, and the other side of the radial bearings 6 is abutted with the housing 1 to increase the stability of the gear placement.

[0042] See also Figure 5 and Figure 6 The second output shaft 5 includes a fixed portion 51 fixedly connected to the second rotating shaft 33, a sliding portion 52 slidably connected to the fixed portion, and a spring 53 disposed between the fixed portion 51 and the sliding portion 52. An end of the fixed portion 51 close to the sliding portion 52 and an end of the sliding portion 52 close to the fixed portion 51 are both provided with a placement cavity 54 for placing the spring 53 and abutting against the spring 53.

[0043] An outer wall of the fixed portion 51 near one end of the sliding portion 52 is provided with an outer spline 511, and an inner wall of the sliding portion 52 near one end of the fixed portion 51 is provided with an inner spline 521 meshing with the outer spline 511. The cooperation between the inner spline 521 and the outer spline 511 enables the sliding portion 52 and the fixed portion 51 to rotate together. A limit block 522 is fixed on the outer side of the sliding portion 52 near one end of the fixed portion 51, and a slide groove 41 is provided on the inner wall of the first output shaft 4 for the limit block 522 to slide. When the limit block 522 slides to the end of the slide groove 41, the sliding portion 52 cannot continue to interact in the direction away from the fixed portion 51, thereby preventing the fixed portion 51 and the sliding portion 52 from separating.

[0044] See also Figure 7 A drill rod comprises an outer rod 7 and a connecting rod 8 , wherein the connecting rod 8 passes through the outer rod 7 and can rotate inside the outer rod 7 .

[0045] The outer wall of the outer rod 7 is provided with a probe cavity 71, in which a probe 72 is placed, and a cover plate 73 is provided on the probe cavity 71. The cover plate 73 is bolted to the outer rod 7 and can seal the probe cavity 71. The probe 72 can emit radio waves and cooperate with the detection equipment on the ground to understand the position of the drill bit 81 in real time. An inclined portion 74 is provided at one end of the outer rod 7 away from the power device, and an angle is formed between the inclined portion 74 and the outer rod 7. The end of the connecting rod 8 close to the inclined portion 74 extends out of the inclined portion 74 and is fixed with a roller drill bit 81.

[0046] When connected, the outer rod 7 is threadedly connected to the first output shaft 4, and the first output shaft 4 transmits rotation to the outer rod 7; the connecting rod 8 is threadedly connected to the second output shaft 5, and the second output shaft 5 transmits rotation to the connecting rod 8 and drives the roller drill bit 81 to rotate.

[0047] When in use, the outer rod 7 and the connecting rod 8 rotate simultaneously, the outer rod 7 rotates at a constant speed, and the soil pressure on the roller drill bit 81 changes uniformly along the circumference, so the trajectory is basically straight drilling. When the outer rod 7 stops rotating, the roller drill bit 81 is subjected to a greater soil pressure along the inclined portion 74, and the roller drill bit 81 moves forward along the inclined portion 74.

[0048] When the roller drill bit 81 encounters a relatively hard soil layer or a soil layer with many rocks during its advancement, the advancement speed will suddenly slow down, and the spring 53 provides a buffer stroke to reduce the stress on the connecting rod of the roller drill bit 81. Then, the sliding part 52 is reset under the action of the spring 53, and a buffer stroke is reserved for the next buffer. In this process, the spring 53 absorbs the impact force and releases it slowly, reducing the damage to the equipment.

[0049] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual output shaft trenchless directional drilling rig power unit, characterized in that: It comprises a housing (1), a first driving device (2) arranged inside the housing (1), a second driving device (3) arranged inside the housing (1), a first output shaft (4) driven to rotate by the first driving device (2), and a second output shaft (5) driven to rotate by the second driving device (3); the second output shaft (5) is arranged inside the first output shaft (4), the axes of the two coincide with each other and can rotate relative to each other; The second output shaft (5) comprises a fixed portion (51) driven to rotate by the second driving device (3), a sliding portion (52) slidably connected to the fixed portion (51), and an elastic member driving the sliding portion (52) to move in a direction away from the fixed portion (51); an outer wall of the fixed portion (51) close to one end of the sliding portion (52) is provided with an external spline (511), and an inner wall of the sliding portion (52) close to one end of the fixed portion (51) is provided with an internal spline (521) meshing with the external spline (511); The invention comprises an outer rod (7) and a connecting rod (8), wherein the connecting rod (8) passes through the outer rod (7) and is capable of rotating inside the outer rod (7); an inclined portion (74) is provided at one end of the outer rod (7) away from the power device, and an angle is formed between the inclined portion (74) and the outer rod (7); an end of the connecting rod (8) close to the inclined portion (74) extends out of the inclined portion (74) and is fixed with a roller drill bit (81); When in use, the outer rod (7) and the connecting rod (8) rotate simultaneously, the outer rod (7) rotates at a constant speed, and the soil pressure on the roller drill bit (81) changes uniformly along the circumference, so that the trajectory is basically straight drilling; when the outer rod (7) stops rotating, the roller drill bit (81) is subjected to a greater soil pressure along the inclined portion (74), and the roller drill bit (81) moves forward in the direction of the inclined portion (74); when the roller drill bit (81) encounters a harder soil layer or a soil layer with more stones during its advancement, the advancement speed will suddenly slow down, and the spring (53) provides a buffer stroke to reduce the stress on the roller drill bit (81) and the connecting rod, and then the sliding portion (52) is reset under the action of the spring (53), reserving a buffer stroke for the next buffer; during this process, the spring (53) absorbs the impact force and releases it slowly, reducing damage to the equipment.

2. The dual output shaft trenchless directional drilling rig power device according to claim 1, characterized in that: A limiting block (522) is fixed on the outer side of the sliding portion (52) close to one end of the fixing portion (51), and a sliding groove (41) for the limiting block (522) to slide is provided on the inner wall of the first output shaft (4).

3. The dual output shaft trenchless directional drilling rig power device according to claim 1, characterized in that: The first driving device (2) and the second driving device (3) are driven by gears, and the gears used are helical gears.

4. The dual output shaft trenchless directional drilling rig power device according to claim 3, characterized in that: Both sides of the gears of the first drive device (2) and the second drive device (3) are in contact with radial bearings (6), and the other side of the radial bearing (6) is in contact with the housing (1).

5. The dual output shaft trenchless directional drilling rig power device according to claim 1, characterized in that: The outer wall of the outer rod (7) is provided with a probe cavity (71), and a probe (72) is placed in the probe cavity (71).

6. The dual output shaft trenchless directional drilling rig power device according to claim 5, characterized in that: The probe cavity (71) is provided with a cover plate (73), the cover plate (73) and the outer rod (7) are connected by bolts and are capable of sealing the probe cavity (71).

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