Transmission shaft assembly and screw drill

Abstract

The invention relates to the technical field of screw drilling tools, in particular to a transmission shaft assembly and a screw drilling tool, and aims to relieve the technical problem that a series bearing and a TC bearing are prone to failure in the related technology. The transmission shaft assembly comprises a transmission shaft, a transmission shell and a bearing assembly. The bearing assembly comprises an upper TC bearing, an upper PDC bearing set, a conical string bearing, a lower PDC bearing set and a lower TC bearing. The bearing assembly is provided with a lubricating oil channel, and the lubricating oil channel sequentially penetrates through the upper PDC bearing set, the conical string bearing and the lower PDC bearing set from the upper TC bearing and extends to the lower TC bearing. The opposite ends of the upper TC bearing and the lower TC bearing are arranged in a sealed mode. The bearing assembly is sleeved with the transmission shell, and the two ends of the transmission shell are fixedly connected with the upper TC bearing and the lower TC bearing respectively. According to the transmission shaft assembly, the transmission speed and the bearing capacity of the screw drilling tool are increased through the combined action of the PDC bearing set and the conical string bearing; and the lubricating design is additionally arranged, so that the probability of wear failure of the bearing is reduced, and the service life of the transmission shaft assembly is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of screw drill tools, and in particular to a transmission shaft assembly and a screw drill tool. Background Art

[0002] At present, screw drill tools are widely used in drilling projects at home and abroad. Screw drill tools are mainly composed of four major assemblies. During use, the movements of each component are closely connected. Failure of any component will affect the service life of the screw drill tool, especially the drive shaft assembly, which has the highest frequency of failure during use.

[0003] The drive shaft assembly has the most structural parts and the most complex connections. Experts and scholars at home and abroad have made corresponding structural design improvements to the drive shaft assembly, but there are still many faults. In particular, the string bearings are usually overloaded and rolled to wear and fail early, affecting the transmission efficiency of the drive shaft. In addition, the rotation between the TC bearings of conventional screw drilling tools is sliding friction. The drilling fluid and mud contain solid particles, which often penetrate into the contact surfaces of the TC bearings, causing the TC bearings to get stuck and unable to rotate, and finally causing the drive shaft to be unable to rotate or overload and break. Summary of the invention

[0004] The object of the present invention is to provide a transmission shaft assembly and a screw drill to alleviate the technical problem that the string bearing and the TC bearing are prone to failure in the related art.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] In a first aspect, the transmission shaft assembly provided by the present invention comprises: a transmission shaft, a transmission housing and a bearing assembly;

[0007] The bearing assembly includes an upper TC bearing, an upper PDC bearing group, a tapered string bearing, a lower PDC bearing group and a lower TC bearing, which are sequentially arranged on the transmission shaft along the axial direction of the transmission shaft;

[0008] The bearing assembly is provided with a lubricating oil passage for flowing lubricating oil, and the lubricating oil passage extends from the upper TC bearing through the upper PDC bearing group, the tapered string bearing, the lower PDC bearing group in sequence to the lower TC bearing;

[0009] The ends of the upper TC bearing and the lower TC bearing facing away from each other are both sealed;

[0010] The transmission housing is sleeved on the bearing assembly, and two ends of the transmission housing are fixedly connected to the upper TC bearing and the lower TC bearing respectively.

[0011] Further, the upper TC bearing comprises an upper TC static sleeve and an upper TC dynamic sleeve;

[0012] The upper TC static sleeve is sleeved on the upper TC dynamic sleeve, and the inner wall of the upper TC static sleeve and the outer wall of the upper TC dynamic sleeve are both inlaid with a first wear-resistant alloy layer and are mounted in cooperation through the first wear-resistant alloy layer.

[0013] Furthermore, the upper TC static sleeve is provided with a first oil hole penetrating through its side wall, the first oil hole is communicated with the lubricating oil passage, and is blocked by a screw plug threadedly connected to the upper TC static sleeve;

[0014] A first rectangular sealing ring is provided between the upper TC static sleeve and the upper TC dynamic sleeve, and the first rectangular sealing ring is located at one end of the lubricating oil passage.

[0015] Furthermore, a piston is provided between the upper TC static sleeve and the upper TC dynamic sleeve, and the piston can slide along the axial direction of the upper TC bearing.

[0016] Furthermore, the bearing assembly also includes a middle spacer sleeve, an upper pressure ring and an upper stop sleeve;

[0017] The intermediate spacer sleeve is sleeved on the upper TC bearing and is located in a cavity formed by the upper TC bearing and the transmission housing;

[0018] The two ends of the upper pressure ring are respectively in contact with the upper TC bearing and the upper PDC bearing group;

[0019] The upper stopper sleeve is sleeved on the upper pressure ring, and two ends thereof are also respectively in contact with the upper TC bearing and the upper PDC bearing group.

[0020] Further, the bearing assembly also includes a lower pressure ring, a lower stopper sleeve and an adjustment ring located between the lower PDC bearing group and the lower TC bearing;

[0021] The lower pressure ring and the lower stop sleeve are both in contact between the lower PDC bearing group and the adjustment ring, and one end of the adjustment ring away from the lower stop sleeve is in contact with the lower TC bearing.

[0022] Further, the lower TC bearing includes a lower TC static sleeve and a lower TC dynamic sleeve;

[0023] The lower TC static sleeve is sleeved on the lower TC dynamic sleeve, and the inner wall of the lower TC static sleeve and the outer wall of the lower TC dynamic sleeve are both inlaid with a second wear-resistant alloy layer and are mounted in cooperation through the second wear-resistant alloy layer.

[0024] Furthermore, the lower TC static sleeve is provided with a second oil hole penetrating through its side wall, the second oil hole is communicated with the lubricating oil passage, and is blocked by a plug threadedly connected to the lower TC static sleeve;

[0025] A mud guard ring and a second rectangular sealing ring are provided between the lower TC static sleeve and the lower TC dynamic sleeve. The mud guard ring and the second rectangular sealing ring are sequentially distributed from the lower TC bearing to the lower PDC bearing assembly.

[0026] Furthermore, the transmission shaft assembly also includes a water cap, and the water cap is connected to the end of the transmission shaft close to the upper TC bearing through a straight thread.

[0027] In summary, the technical effects that can be achieved by the transmission shaft assembly provided by the present invention are:

[0028] The transmission shaft assembly provided by the present invention includes a transmission shaft, a transmission housing and a bearing assembly; the bearing assembly includes an upper TC bearing, an upper PDC bearing group, a tapered string bearing, a lower PDC bearing group and a lower TC bearing, and the five are sequentially arranged on the transmission shaft along the axial direction of the transmission shaft; a lubricating oil channel is provided on the bearing assembly for flowing lubricating oil, and the lubricating oil channel extends from the upper TC bearing through the upper PDC bearing group, the tapered string bearing, the lower PDC bearing group to the lower TC bearing in sequence; the opposite ends of the upper TC bearing and the lower TC bearing are both sealed; the transmission housing is sleeved on the bearing assembly, and its two ends are fixedly connected to the upper TC bearing and the lower TC bearing respectively.

[0029] In the drive shaft assembly, the upper PDC bearing group, the tapered string bearing and the lower PDC bearing group cooperate to withstand strong loads; the opposite ends of the upper TC bearing and the lower TC bearing are sealed to prevent related solid particles from penetrating between the bearing contact surfaces; the bearing assembly is provided with a lubricating oil channel, and the lubricating oil flowing in the lubricating oil channel can lubricate the upper TC bearing, the upper PDC bearing group, the tapered string bearing, the lower PDC bearing group and the lower TC bearing, thereby reducing wear, thereby ensuring its effectiveness and also increasing its service life.

[0030] It can be seen that compared with the existing technology, the drive shaft assembly utilizes the combined effect of the PDC bearing group and the tapered string bearing, which is beneficial to increase the transmission speed and load-bearing capacity of the screw drill bit; and the additional lubrication design helps to reduce the probability of bearing wear failure, thereby extending the service life of the drive shaft assembly.

[0031] In a second aspect, the present invention provides a screw drill including the transmission shaft assembly.

[0032] The beneficial effects of a screw drill provided by the present invention are:

[0033] The screw drill provided by the present invention includes a transmission shaft assembly. Therefore, the technical advantages and effects achieved by the screw drill also include the technical advantages and effects achieved by the above-mentioned transmission shaft assembly, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A cross-sectional view of a transmission shaft assembly provided by an embodiment of the present invention;

[0036] Figure 2 for Figure 1 The enlarged view of point Ⅰ;

[0037] Figure 3 for Figure 1 The enlarged view of the II;

[0038] Figure 4 Figure 1 Schematic diagram of the upper section;

[0039] Figure 5 Figure 1 Schematic diagram of the lower section.

[0040] Icons: 1-drive shaft; 2-drive housing; 3-upper PDC bearing group; 4-tapered string bearing; 5-lower PDC bearing group; 6-lubricating oil channel; 7-upper TC static sleeve; 8-upper TC dynamic sleeve; 9-first wear-resistant alloy layer; 10-first oil hole; 11-thread plug; 12-first rectangular sealing ring; 13-piston; 14-middle spacer sleeve; 15-upper pressure ring; 16-upper stopper sleeve; 17-lower pressure ring; 18-lower stopper sleeve; 19-adjusting ring; 20-lower TC static sleeve; 21-lower TC dynamic sleeve; 22-second wear-resistant alloy layer; 23-second oil hole; 24-plug; 25-mud retaining ring; 26-second rectangular sealing ring; 27-water cap; 28-O-ring. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0044] The drive shaft assembly has the most structural parts and the most complex connections. Experts and scholars at home and abroad have made corresponding structural design improvements to the drive shaft assembly, but there are still many faults. In particular, the string bearings are usually overloaded and rolled to wear and fail early, affecting the transmission efficiency of the drive shaft. In addition, the rotation between the TC bearings of conventional screw drilling tools is sliding friction. The drilling fluid and mud contain solid particles, which often penetrate into the contact surfaces of the TC bearings, causing the TC bearings to get stuck and unable to rotate, and finally causing the drive shaft to be unable to rotate or overload and break.

[0045] In view of this, the present invention provides a transmission shaft assembly, including a transmission shaft 1, a transmission housing 2 and a bearing assembly; the bearing assembly includes an upper TC bearing, an upper PDC bearing group 3, a tapered string bearing 4, a lower PDC bearing group 5 and a lower TC bearing, and the five are sequentially arranged on the transmission shaft 1 along the axial direction of the transmission shaft 1; a lubricating oil channel 6 is provided on the bearing assembly for flowing lubricating oil, and the lubricating oil channel 6 extends from the upper TC bearing through the upper PDC bearing group 3, the tapered string bearing 4, the lower PDC bearing group 5 to the lower TC bearing in sequence; the opposite ends of the upper TC bearing and the lower TC bearing are both sealed; the transmission housing 2 is sleeved on the bearing assembly, and its two ends are fixedly connected to the upper TC bearing and the lower TC bearing respectively.

[0046] In the transmission shaft assembly, the upper PDC bearing group 3, the tapered string bearing 4, and the lower PDC bearing group 5 cooperate to withstand strong loads; the opposite ends of the upper TC bearing and the lower TC bearing are sealed to prevent related solid particles from penetrating between the bearing contact surfaces; a lubricating oil channel 6 is provided on the bearing assembly, and the lubricating oil flowing in the lubricating oil channel 6 can lubricate the upper TC bearing, the upper PDC bearing group 3, the tapered string bearing 4, the lower PDC bearing group 5 and the lower TC bearing to reduce wear, thereby ensuring its effectiveness and also increasing its service life.

[0047] It can be seen that compared with the prior art, the transmission shaft assembly utilizes the combined effect of the PDC bearing group and the tapered string bearing 4, which is beneficial to increasing the transmission speed and load-bearing capacity of the screw drill; and the additional lubrication design helps to reduce the probability of bearing wear failure, thereby extending the service life of the transmission shaft assembly.

[0048] The following combination Figures 1 to 5 The structure and shape of the transmission shaft assembly provided in this embodiment are described in detail:

[0049] refer to Figures 1 to 5 The transmission shaft assembly also includes a water cap 27, which is processed with a water hole. The water cap 27 is connected to the transmission shaft 1 with a straight thread; the upper TC bearing includes an upper TC static sleeve 7 and an upper TC dynamic sleeve 8, and the sealing assembly is installed between the upper TC static sleeve 7 and the upper TC dynamic sleeve 8. The upper TC static sleeve 7 and the upper TC dynamic sleeve 8 are both inlaid with a first wear-resistant alloy layer 9, and the upper TC static sleeve 7 and the upper TC dynamic sleeve 8 are installed in conjunction with the first wear-resistant alloy layer 9 inlaid; the upper stopper sleeve 16 is installed in conjunction with the end face of the upper TC static sleeve 7, the upper pressure ring 15 is installed in conjunction with the end face of the upper PDC bearing group 3, and is pressed and matched with the upper PDC bearing group 3 and the end face of the tapered string bearing 4, and is installed in the transmission housing 2, and the upper pressure ring 15 is processed in the middle of the upper PDC bearing group 3 There is a lubricating oil passage 6; the lower PDC bearing group 5 is respectively pressed and fitted with the end faces of the lower stop sleeve 18 and the lower pressure ring 17, and a lubricating oil passage 6 is processed between the lower PDC bearing group 5 and the lower stop sleeve 18. The lower end face of the lower stop sleeve 18 is pressed and fitted with the upper end face of the adjusting ring 19, and the upper end face of the lower TC static sleeve 20 is pressed and fitted with the lower end face of the adjusting ring 19, and a lubricating oil passage 6 is processed between the lower TC static sleeve 20 and the adjusting ring 19; the lower TC static sleeve 20 and the lower TC moving sleeve 21 are installed in cooperation through the second wear-resistant alloy layer 22 of the insert sleeve, and an O-ring 28 is installed in the sealing groove processed by the lower TC moving sleeve 21, and the lower TC moving sleeve 21 is installed on the outer cylindrical surface of the lower end of the transmission shaft 1, and the upper end of the lower TC static sleeve 20 is connected with the lower end of the transmission housing 2 through a straight thread.

[0050] In continuation of the above, the upper TC static sleeve 7 is provided with a first oil hole 10 penetrating through its side wall, the first oil hole 10 is communicated with the lubricating oil passage 6, and is blocked by a plug 11 threadedly connected to the upper TC static sleeve 7; the lower TC static sleeve 20 is provided with a second oil hole 23 penetrating through its side wall, the second oil hole 23 is communicated with the lubricating oil passage 6, and is blocked by a plug 24 threadedly connected to the lower TC static sleeve 20. Lubricating oil can be added or replaced through the first oil hole 10 and the second oil hole 23.

[0051] Continuing with the above, the sealing assembly includes a piston 13, a first rectangular sealing ring 12 and a spacer ring. The piston 13 is installed in the middle space between the upper TC static sleeve 7 and the upper TC dynamic sleeve 8. The spacer ring is installed between the two first rectangular sealing rings 12. The first rectangular sealing ring 12 and the spacer ring are combined and connected in series in the middle space between the upper TC static sleeve 7 and the upper TC dynamic sleeve 8. A rectangular sealing groove is processed in the inner hole of the lower end surface of the lower TC static sleeve 20, and the second rectangular sealing ring 26 and the mud guard ring 25 are installed in the rectangular sealing groove.

[0052] In the above design, the piston 13 of the sealing assembly in the space filled with silicone oil will have a buffering effect on the entire sealing structure as the drill tool vibrates, reducing damage to the drill tool bearing; the combined effect of the PDC bearing group and the tapered string bearing 4 is beneficial to increasing the transmission speed and load-bearing capacity of the screw drill tool; the lubrication design and shortening of the TC bearing length, and the design of the sealing assembly as a dynamic and static combination, help reduce the probability of TC bearing wear failure and extend the service life of the screw drill tool drive shaft assembly.

[0053] The present invention also provides a screw drill tool, including a transmission shaft assembly. The technical advantages and effects achieved by the screw drill tool also include the technical advantages and effects achieved by the above-mentioned transmission shaft assembly, which will not be repeated here.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transmission shaft assembly, characterized in that: include: A transmission shaft (1), a transmission housing (2) and a bearing assembly; The bearing assembly comprises an upper TC bearing, an upper PDC bearing group (3), a tapered string bearing (4), a lower PDC bearing group (5) and a lower TC bearing, which are sequentially arranged on the transmission shaft (1) along the axial direction of the transmission shaft (1); The bearing assembly is provided with a lubricating oil passage (6) for flowing lubricating oil, and the lubricating oil passage (6) extends from the upper TC bearing through the upper PDC bearing group (3), the tapered string bearing (4), the lower PDC bearing group (5) in sequence to the lower TC bearing; The ends of the upper TC bearing and the lower TC bearing facing away from each other are both sealed; The transmission housing (2) is sleeved on the bearing assembly, and its two ends are respectively fixedly connected to the upper TC bearing and the lower TC bearing.

2. The transmission shaft assembly according to claim 1, characterized in that: The upper TC bearing comprises an upper TC static sleeve (7) and an upper TC dynamic sleeve (8); The upper TC static sleeve (7) is sleeved on the upper TC dynamic sleeve (8); the inner wall of the upper TC static sleeve (7) and the outer wall of the upper TC dynamic sleeve (8) are both inlaid with a first wear-resistant alloy layer (9) and are mounted in coordination with the first wear-resistant alloy layer (9).

3. The transmission shaft assembly according to claim 2, characterized in that: The upper TC static sleeve (7) is provided with a first oil hole (10) penetrating through its side wall, the first oil hole (10) is communicated with the lubricating oil passage (6) and is blocked by a threaded plug (11) threadedly connected to the upper TC static sleeve (7); A first rectangular sealing ring (12) is provided between the upper TC static sleeve (7) and the upper TC dynamic sleeve (8), and the first rectangular sealing ring (12) is located at one end of the lubricating oil passage (6).

4. The transmission shaft assembly according to claim 3, characterized in that: A piston (13) is also provided between the upper TC static sleeve (7) and the upper TC dynamic sleeve (8), and the piston (13) can slide along the axial direction of the upper TC bearing.

5. The transmission shaft assembly according to claim 1, characterized in that: The bearing assembly also includes a middle spacer sleeve (14), an upper pressure ring (15) and an upper stop sleeve (16); The intermediate spacer sleeve (14) is sleeved on the upper TC bearing and is located in a cavity formed by the upper TC bearing and the transmission housing (2); The two ends of the upper pressure ring (15) are respectively in contact with the upper TC bearing and the upper PDC bearing group (3); The upper stopper sleeve (16) is sleeved on the upper pressure ring (15), and its two ends are also respectively in contact with the upper TC bearing and the upper PDC bearing group (3).

6. The transmission shaft assembly according to claim 5, characterized in that: The bearing assembly further comprises a lower pressure ring (17), a lower stopper sleeve (18) and an adjustment ring (19) located between the lower PDC bearing group (5) and the lower TC bearing; The lower pressure ring (17) and the lower stop sleeve (18) are both in contact between the lower PDC bearing group (5) and the adjustment ring (19), and one end of the adjustment ring (19) away from the lower stop sleeve (18) is in contact with the lower TC bearing.

7. The transmission shaft assembly according to claim 1, characterized in that: The lower TC bearing comprises a lower TC static sleeve (20) and a lower TC dynamic sleeve (21); The lower TC static sleeve (20) is sleeved on the lower TC dynamic sleeve (21); the inner wall of the lower TC static sleeve (20) and the outer wall of the lower TC dynamic sleeve (21) are both inlaid with a second wear-resistant alloy layer (22) and are mounted in coordination with the second wear-resistant alloy layer (22).

8. The transmission shaft assembly according to claim 7, characterized in that: The lower TC static sleeve (20) is provided with a second oil hole (23) penetrating through its side wall, the second oil hole (23) is communicated with the lubricating oil passage (6) and is blocked by a plug (24) threadedly connected to the lower TC static sleeve (20); A mud retaining ring (25) and a second rectangular sealing ring (26) are provided between the lower TC static sleeve (20) and the lower TC dynamic sleeve (21), and the mud retaining ring (25) and the second rectangular sealing ring (26) are distributed in sequence from the lower TC bearing to the lower PDC bearing group (5).

9. The transmission shaft assembly according to any one of claims 1 to 8, characterized in that: The transmission shaft assembly also includes a water cap (27), and the water cap (27) is connected to the end of the transmission shaft (1) close to the upper TC bearing through a straight thread.

10. A screw drill, characterized in that: Comprising a transmission shaft assembly as claimed in any one of claims 1 to 9.

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