An automatic docking device for internal and external power output shafts and double-wall drill pipes

Abstract

The invention discloses an automatic docking device for an internal and external power output shaft and a double-wall drill pipe, comprising an internal and external power output shaft and a dual-drive power head, wherein the internal and external power output shaft comprises an internal rotating main shaft, a hexagonal head inner sleeve, an elastic body is arranged between the inner cavity end face of the hexagonal head inner sleeve and the top end of the internal rotating main shaft, and an outer sleeve is arranged outside the hexagonal head inner sleeve; the dual-drive power head comprises gears one to four, gear one is connected to an external rotating reducer, the external rotating reducer is connected to an external rotating drive motor, gear two is provided with an external rotating main shaft, one end of the external rotating main shaft is connected to an adapter, the internal rotating main shaft is inserted into the external rotating main shaft, gear three is arranged on one end of the internal rotating main shaft, and gear four is connected to the internal rotating drive motor; one end of the outer sleeve is connected to the adapter, and the other end is connected to the double-wall drill pipe. The device has a simple and compact structure, high efficiency, low cost, can accurately dock the internal and external power output shaft with the double-wall drill pipe, has a high degree of automation, and reduces labor intensity.

Description

Technical Field

[0001] The invention relates to a docking device, in particular to an automatic docking device for an inner and outer power output shaft and a double-wall drill pipe, which is applied to the field of horizontal directional drilling. Background Art

[0002] Horizontal directional drilling rig is a kind of construction machinery that lays various underground utilities (pipelines, cables, etc.) without excavating the surface of the ground. It is widely used in the laying of pipelines for water supply, electricity, telecommunications, natural gas, coal gas, oil, etc. It is suitable for sand, clay, pebbles and other conditions. It can be constructed in most non-hard rock areas in my country. The working environment temperature is -15℃~+45℃. Horizontal directional drilling technology is a new construction technology that combines the directional drilling technology of the petroleum industry with the traditional pipeline construction method. It has the advantages of fast construction speed, high construction accuracy and low cost. It is widely used in the laying of pipelines for water supply, coal gas, electricity, telecommunications, natural gas, oil, etc. Horizontal directional drilling equipment has also achieved rapid development in the past decade and has become an emerging industry in developed countries. At present, its development trend is moving towards large-scale and miniaturization, adaptation to hard rock operations, self-contained anchoring system, automatic stacking and extraction of drill rods, automatic lubrication of drill rod connections, anti-electric shock system and other automated operation functions, ultra-deep guidance monitoring, and a wide range of applications. This equipment is generally suitable for pipe The maximum laying length of steel pipes and PE pipes can reach 1500m, which is suitable for various soil conditions from soft soil to hard rock and has broad application prospects.

[0003] However, in the current horizontal directional drilling rig, the inner and outer power output shafts are connected to the double-wall drill pipe manually, which has too many influencing factors, is difficult to operate, has poor precision, is time-consuming, and is prone to damage to parts, resulting in increased costs. Therefore, developing an automatic docking device that can overcome the above-mentioned defects has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic docking device for internal and external power output shafts and double-wall drill pipes, which has a simple and compact structure, high efficiency, low cost, can accurately dock the internal and external power output shafts with the double-wall drill pipe, has a high degree of automation, and reduces labor intensity.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] An automatic docking device for an internal and external power output shaft and a double-wall drill pipe comprises an internal and external power output shaft and a dual-drive power head, wherein the dual-drive power head is connected to one end of the internal and external power output shaft;

[0007] The inner and outer power output shafts include an inner rotating main shaft, the outer sleeve of the inner rotating main shaft is sleeved with a hexagonal head inner sleeve, one end of the hexagonal head inner sleeve is a hexagonal head, and an accommodating cavity is formed between the inner cavity of the hexagonal head inner sleeve and the inner cavity of the top end of the inner rotating main shaft, and an elastic body is arranged in the accommodating cavity; the outer sleeve of the hexagonal head is sleeved with an outer sleeve, and the inner wall of the outer sleeve is provided with a third limiting step, and the third limiting step abuts against the surface of the hexagonal head inner sleeve;

[0008] The dual-drive power head includes a double-layer gear box, in which gear one, gear two, gear three and gear four are arranged, wherein gear two is meshed with gear one and is arranged below gear one, two gear fours are symmetrically arranged on both sides of gear three and meshed with gear three, and gear three is coaxially and parallelly arranged with gear two; the gear one is connected to an external rotation reducer arranged on one side of the double-layer gear box, and the side of the external rotation reducer away from the double-layer gear box is connected to an external rotation drive motor; an external rotation main shaft is arranged in gear two, one end of the external rotation main shaft extends out of the double-layer gear box and is connected to an adapter through threads, the adapter is connected to the outer sleeve, the inner rotation main shaft in the inner and outer power output shafts is inserted into the outer rotation main shaft, and a gear three is arranged on the end of the inner rotation main shaft away from the hexagonal head inner sleeve, and the two gears four on both sides of the gear three are respectively connected to the inner rotation drive motor arranged on one side of the double-layer gear box;

[0009] One end of the outer sleeve is connected to the adapter in the dual-drive power head, and the other end is connected to the double-wall drill pipe.

[0010] The end surface of the inner cavity of the hexagonal head inner sleeve is concave to form a first limiting step, and a second limiting step is provided on the inner cavity wall at the top end of the inner rotating spindle. The first limiting step and the second limiting step form a accommodating cavity adapted to the elastomer.

[0011] Limiting washers are respectively arranged between the elastic body and the first limiting step and the second limiting step, and the two ends of the elastic body are against the two limiting washers.

[0012] The elastic body is a spring.

[0013] The hexagonal head inner sleeve and the inner rotating main shaft are connected through spline matching.

[0014] The outer drill rod in the double-wall drill rod is provided with a male buckle, and the outer sleeve is provided with a female buckle matched with the male buckle.

[0015] The outer sleeve is matched with the adapter and connected by bolts.

[0016] The second gear is connected to the outer rotating main shaft via a key; the third gear is connected to the inner rotating main shaft via a key.

[0017] After adopting the above scheme, the beneficial effects of the present invention are:

[0018] (1) The inner cavity end face of the hexagonal head inner sleeve of the present invention is matched with the outer end face of the inner rotating main shaft. The rightward sliding of the hexagonal head inner sleeve is limited by the inner cavity end face of the hexagonal head inner sleeve and the outer end face of the inner rotating main shaft. The hexagonal head inner sleeve does not slide infinitely to the right. If it is not limited, the spring is easily compressed and fails. The spring is protected and the hexagonal head inner sleeve is not allowed to slide infinitely to the right.

[0019] (2) The present invention provides a first limiting step and a second limiting step in the inner rotating main shaft and the hexagonal head inner sleeve to form a receiving cavity adapted to the elastic body. The end faces of the limiting steps at both ends of the receiving cavity are provided with limiting washers. The inner cavity diameter of the hexagonal head inner sleeve is relatively large, and the spring has poor stability after being compressed, and is easily distorted and deformed, which affects the operation of the work. In addition, if the limiting washers are not provided, the difference between the middle diameter of the elastic body and the diameter of the mud channel is small. When the elastic body is compressed, one side of the elastic body is easy to sink into the mud channel, causing the elastic body to tilt. The elastic body receiving cavity at the right end is very shallow, and the space outside the receiving cavity is relatively large. The spring is easy to lose stability and distort into the large space, causing the spring to fail.

[0020] (3) A third limiting step is provided on the inner wall of the outer sleeve of the present invention, and a spring is provided between the hexagonal inner sleeve and the inner rotating spindle. The third limiting step abuts against the surface of the hexagonal inner sleeve to ensure that the hexagonal inner sleeve is not pushed out by the inner rotating spindle when the spring is compressed, thereby preventing the hexagonal inner sleeve from being separated from the inner rotating spindle and failing to transmit torque;

[0021] (4) In the present invention, limiting washers are respectively provided at both ends of the elastic body to ensure the stability of the elastic body.

[0022] In summary, in the prior art, the docking of double-wall drill pipes depends entirely on manual hand-held observation for docking operations, which is difficult to operate. When they are not aligned, it is easy to damage parts, resulting in increased costs. The present invention adopts a dual-drive power head to provide power, and the rotating inner shaft uses a spring to directly push the hexagonal head into the hexagonal sleeve of the inner drill pipe. It has a high degree of automation, good accuracy, and improved results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the dual-drive power head in the present invention;

[0024] Figure 2 yes Figure 1 sectional view of

[0025] Figure 3 It is a structural schematic diagram of the automatic docking device between the inner and outer power output shafts and the double-wall drill pipe in the present invention;

[0026] Figure 4 It is a structural schematic diagram of the internal and external power output shafts and the double-wall drill pipe automatic docking device in the present invention.

[0027] Reference numerals:

[0028] 1. External rotary drive motor; 2. External rotary reducer; 3. Double-layer gear box;

[0029] 4. Gear 1; 5. Gear 2; 6. External rotating spindle; 7. Internal rotating spindle;

[0030] 8. Gear three; 9. Internal rotation drive motor; 10. Gear four; 11. Adapter;

[0031] 12. Outer sleeve; 13. Hexagonal head inner sleeve; 14. Limit washer; 15. Elastomer;

[0032] 16. External drill rod; 17. Hexagonal head; 18. End face; 19. First limit step;

[0033] 20. Second limiting step; 21. Third limiting step; 22. Hexagonal sleeve for inner drill rod. DETAILED DESCRIPTION

[0034] The technical solutions and beneficial effects of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] like Figures 1 to 4 As shown, the present invention provides an automatic docking device for an internal and external power output shaft and a double-wall drill pipe, comprising an internal and external power output shaft and a dual-drive power head, wherein the dual-drive power head is connected to one end of the internal and external power output shaft, wherein:

[0036] The inner and outer power output shafts include an inner rotating main shaft 7, the outer sleeve of the inner rotating main shaft 7 is provided with a hexagonal head inner sleeve 13, one end of the hexagonal head inner sleeve 13 is a hexagonal head 17 designed with an outer hexagonal design using the prior art, the hexagonal head inner sleeve 13 slides rightward through the inner cavity end face of the hexagonal head inner sleeve 13 and the outer end face of the inner rotating main shaft 7 to limit, and an accommodating cavity is formed between the inner cavity of the hexagonal head inner sleeve 13 and the inner cavity at the top of the inner rotating main shaft 7, and an elastic body 15 is provided in the accommodating cavity, and the end face 18 of the inner cavity of the hexagonal head inner sleeve 13 is concave to form a first limiting step 1 9, a second limiting step 20 is provided on the inner wall of the top end of the inner rotating main shaft 7, the first limiting step 19 and the second limiting step 20 form a receiving cavity adapted to the elastic body 15, limiting washers 14 are provided between the elastic body 15 and the first limiting step 19 and the second limiting step 20, respectively, the two ends of the elastic body 15 are respectively against the limiting washers 14 at the two ends, the outer sleeve 12 is sleeved on the outside of the hexagonal head inner sleeve 13, the inner wall of the outer sleeve 12 is provided with a third limiting step 21, and the third limiting step 21 is against the surface of the hexagonal head inner sleeve 13;

[0037] The double-drive power head includes a double-layer gear box 3, in which gear one 4, gear two 5, gear three 8 and gear four 10 are arranged. Gear two 5 meshes with gear one 4 and is arranged below gear one 4. Two gear fours are symmetrically arranged on both sides of gear three and mesh with gear three. Gear three 8 is coaxially and parallelly arranged with gear two 5. Gear one 4 is connected to an external rotation reducer 2 arranged on one side of the double-layer gear box 3. The side of the external rotation reducer 2 away from the double-layer gear box 3 is connected to an external rotation drive motor 1. An external rotation main shaft 6 is arranged in gear two 5. One end of the external rotation main shaft 6 extends out of the double-layer gear box 3 and is connected to an adapter 11 by threading. The adapter 11 is connected to an outer sleeve 12. An inner rotation main shaft 7 in the inner and outer power output shafts is inserted into the outer rotation main shaft 6. A gear three 8 is arranged on the end of the inner rotation main shaft 7 away from the hexagonal head inner sleeve 13. Two gears four 10 on both sides of gear three 8 are respectively connected to an inner rotation drive motor 9 arranged on one side of the double-layer gear box 3.

[0038] One end of the outer sleeve 12 is connected to the adapter in the dual-drive power head, and the other end is connected to the double-wall drill pipe;

[0039] The double-wall drill rod comprises an outer drill rod 16 and an inner drill rod. The outer drill rod 16 is partially sleeved on the inner drill rod. The other end of the inner drill rod is sleeved with an inner drill rod hexagonal sleeve 22 (the head of the inner drill rod is an outer hexagonal sleeve, on which the inner drill rod hexagonal sleeve 22 is fixed). The inner drill rod hexagonal sleeve 22 is matched with the hexagonal head 17 of the hexagonal head inner casing 13. When docking, the hexagonal head of the hexagonal head inner casing 13 is inserted into the inner drill rod hexagonal sleeve 22. Half of the outer hexagonal sleeve is inserted, and the other half is left for the hexagonal head 17 of the hexagonal head inner casing 13 to be inserted. When docking, the male buckle of the outer drill rod 16 contacts the female buckle of the outer casing 12 and is tightened to complete the rod docking.

[0040] As a preferred embodiment of the present invention, the elastic body 15 is a spring.

[0041] As a preferred embodiment of the present invention, the hexagonal head inner sleeve 13 is provided with an internal spline, and the inner rotating main shaft 7 is provided with an external spline that is compatible with the internal spline. The hexagonal head inner sleeve 13 and the inner rotating main shaft 7 are connected by spline matching to achieve horizontal left and right sliding and torque transmission.

[0042] As a preferred embodiment of the present invention, the outer drill rod 16 in the double-wall drill rod is provided with a male buckle, and the outer sleeve 12 is provided with a female buckle matched with the male buckle.

[0043] As a preferred embodiment of the present invention, the outer sleeve 12 is adapted to the adapter 11 and connected by bolts without relative movement.

[0044] As a preferred embodiment of the present invention, gear 2 5 is connected to the outer rotating main shaft 6 via a key; gear 3 8 is connected to the inner rotating main shaft 7 via a key.

[0045] The dual-drive power head has dual power output when working, specifically:

[0046] The first power device: the torque is input to the external rotating reducer 2 through the external rotating drive motor 1, and the gear 4 is driven after the external rotating reducer 2 reduces the speed and increases the torque, and the gear 4 drives the gear 4 5, and the torque is further reduced and increased and transmitted to the external rotating main shaft 6 through the key, and the external rotating main shaft 6 is connected with the adapter 11 through a threaded connection, and finally the torque and speed are transmitted to the external drill rod through the docking device.

[0047] The second power device: two inner rotating drive motors 9 are distributed on both sides of the inner rotating main shaft 7. The power is input to gear four 10 through the inner rotating drive motor 9. Gear four 10 drives gear three 8 to rotate. Gear three 8 is connected to the inner rotating main shaft 7 through a key to output the power.

[0048] Automatic alignment process: Figure 4 With the left double-wall drill pipe in place (coaxial with the outer casing 12), Figure 1 and Figure 2 The entire dual drive power head moves left until Figure 4 After the left inner drill pipe hexagonal sleeve enters the outer casing 12, Figure 1 and Figure 2 The first and second power devices of the dual-drive power head are turned on, the outer sleeve 12 rotates slowly forward, and the inner rotating spindle 7 drives the hexagonal head inner sleeve 13 to automatically rotate forward and reverse 70°. The dual-drive power head continues to move left, and the right end face of the hexagonal sleeve 22 of the inner drill rod contacts the left end face of the hexagonal head 17 of the hexagonal head inner sleeve 13 and pushes the hexagonal head inner sleeve 13 to slide to the right, and the elastomer 15 is compressed. Since the hexagonal head inner sleeve 13 has been rotating forward and reverse at 70°, when it turns to a certain angle, the hexagonal head 17 of the hexagonal head inner sleeve 13 just matches the hexagonal sleeve 22 of the inner drill rod, and the compressed elastomer 15 (spring) quickly pushes the hexagonal head inner sleeve 13 to the left into the hexagonal sleeve 22 of the inner drill rod. At this time, the outer sleeve rotates the outer drill rod male buckle to contact and tighten the outer sleeve 12 female buckle to complete the entire rod alignment process.

[0049] The double-wall drill rod includes an outer drill rod and an inner drill rod. The outer drill rod is sleeved on one end of the inner drill rod, and the other end of the inner drill rod is sleeved with an inner drill rod hexagonal sleeve. The inner drill rod hexagonal sleeve is matched with the hexagonal head of the hexagonal head inner casing 13. The inner drill rod hexagonal sleeve extends into the outer casing. The head of the inner drill rod is an outer hexagonal with an inner drill rod hexagonal sleeve arranged on it. The outer hexagonal is inserted halfway, and the other half is left for the hexagonal head of the hexagonal head inner casing 13 to be inserted. At this time, the outer drill rod male buckle contacts the outer casing 12 female buckle and is tightened to complete the entire rod alignment process.

[0050] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.

Claims

1. An automatic docking device for internal and external power output shafts and double-wall drill pipes, characterized in that: It includes an inner and outer power output shaft and a dual-drive power head, wherein the dual-drive power head is connected to one end of the inner and outer power output shaft; The inner and outer power output shafts comprise an inner rotating main shaft (7), the outer portion of the inner rotating main shaft (7) is sleeved with a hexagonal inner sleeve (13), one end of the hexagonal inner sleeve (13) is a hexagonal head (17), and an accommodating cavity is formed between the inner cavity of the hexagonal inner sleeve (13) and the inner cavity of the top end of the inner rotating main shaft (7), and an elastic body (15) is arranged in the accommodating cavity; the outer portion of the hexagonal inner sleeve (13) is sleeved with an outer sleeve (12), and the inner wall of the outer sleeve (12) is provided with a third limiting step (21), and the third limiting step (21) abuts against the surface of the hexagonal inner sleeve (13); The dual-drive power head comprises a double-layer gear box (3), in which a first gear (4), a second gear (5), a third gear (8) and a fourth gear (10) are arranged, wherein the second gear (5) meshes with the first gear (4) and is arranged below the first gear (4), two fourth gears are symmetrically arranged on both sides of the third gear and mesh with the third gear (8), and the third gear (8) and the second gear (5) are arranged coaxially and in parallel; the first gear (4) is connected to an external rotation reducer (2) arranged on one side of the double-layer gear box (3), and the external rotation reducer (2) is away from the double-layer gear box (3). One side is connected to an external rotating drive motor (1); an external rotating main shaft (6) is arranged inside the second gear (5); one end of the external rotating main shaft (6) extends out of the double-layer gear box (3) and is connected to an adapter (11) via a thread; the adapter (11) is connected to an outer sleeve (12); an internal rotating main shaft (7) in the internal and external power output shafts is inserted into the external rotating main shaft (6); a third gear (8) is arranged on one end of the internal rotating main shaft (7) away from the hexagonal head inner sleeve (13); two fourth gears (10) on both sides of the third gear (8) are respectively connected to an internal rotating drive motor (9) arranged on one side of the double-layer gear box (3); One end of the outer sleeve (12) is connected to the adapter in the dual-drive power head, and the other end is connected to the double-wall drill pipe; The end surface (18) of the inner cavity of the hexagonal head inner sleeve (13) is concave to form a first limiting step (19), and a second limiting step (20) is provided on the inner cavity wall at the top end of the inner rotating main shaft (7), and the first limiting step (19) and the second limiting step (20) form a receiving cavity adapted to the elastic body (15); Limiting washers (14) are respectively provided between the elastic body (15) and the first limiting step (19) and the second limiting step (20), and the two ends of the elastic body (15) abut against the two limiting washers (14); The elastic body (15) is a spring; The hexagonal head inner sleeve (13) and the inner rotating spindle (7) are connected via a spline fit; The outer drill rod (16) in the double-wall drill rod is provided with a male buckle, and the outer sleeve (12) is provided with a female buckle matched with the male buckle; The outer sleeve (12) is adapted to the adapter (11) and is connected via bolts; The second gear (5) is connected to the outer rotating main shaft (6) via a key; the third gear (8) is connected to the inner rotating main shaft (7) via a key; The inner drill rod hexagonal sleeve (22) is matched with the hexagonal head (17) of the hexagonal head inner casing (13). When docking, a dual-drive power head is used to provide power, and the inner rotating main shaft (7) uses the spring to directly push the hexagonal head (17) into the inner drill rod hexagonal sleeve (22).

Images