Multi-purpose turbine drill thrust bearing service life test bench

Abstract

The invention relates to a multipurpose turbodrill thrust bearing service life test bench, which adopts a vertical structure, and comprises a test tool used for detachably clamping a test bearing; comprising a tool body, a main shaft is arranged in the tool body, the main shaft is sleeved with a test bearing, the main shaft can abut against an inner ring of the test bearing and can drive the test bearing to rotate, and the tool body abuts against the inner ring of the test bearing from the other axial end; the tool body fixes an outer ring of a test bearing. The driving system is in transmission connection with the main shaft and drives the inner ring of the test bearing to rotate through the main shaft; the driving system can adjust the rotating speed of the spindle; the loading system is used for loading an axial load to the inner ring of the test bearing through the main shaft; and the circulating system is used for circulating the test medium into the test tool. Modular design is adopted, the test tool, the driving system, the loading system and the circulating system are clear in division of labor, and the test tool can be disassembled and assembled at any time according to the test requirements and the characteristics of different test bearings, so that the test requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of oil bearing performance test systems, in particular to a multi-purpose turbine drill tool thrust bearing life test bench, belonging to downhole tool simulation experimental equipment in the field of petroleum and natural gas. Background Art

[0002] Turbodrills are key downhole power drills for high-temperature deep well coiled tubing drilling and drilling and grinding operations, and the thrust bearing design for turbodrills is its key core component. As a key component of turbodrills to withstand hydraulic loads and drilling pressure, thrust bearing groups are usually composed of thrust ball bearings or PDC thrust bearings in rows.

[0003] When the turbodrill is working, the thrust bearing group is usually in an abrasive medium and is subjected to the combined effects of a large axial load and high speed, which makes it prone to wear failure, and is the main factor restricting the service life of the turbodrill. In the design and manufacturing process of turbodrill thrust bearings, on the one hand, a large number of scientific experiments on bearing performance tests need to be carried out to explore the fatigue and wear laws of turbodrill thrust bearings of different types and specifications, so as to propose wear-resistant and long-life thrust bearing solutions. On the other hand, the thrust bearing group of the newly developed turbodrill products needs to be tested for life to verify whether it meets the design requirements. In addition, it is necessary to establish a life prediction model for the thrust bearing group under different axial loads and speed conditions, so as to predict the failure of the turbodrill in advance during use, reduce the risk of turbodrill drilling or grinding, and ensure the reliability of turbodrill working underground.

[0004] However, there are currently few test devices specifically for testing the performance of turbodrill thrust bearings, especially a lack of multi-purpose test benches that can simultaneously meet the performance testing requirements of multiple bearings such as thrust ball bearings and PDC thrust bearings.

[0005] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes a multi-purpose turbodrill thrust bearing life test bench to overcome the defects of the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-purpose turbodrill thrust bearing life test bench, which adopts modular design to meet the needs of turbodrill wear-resistant bearing design, turbodrill new product life inspection and turbodrill on-site service life prediction, and the four sections of test fixture, drive system, loading system and circulation system have clear division of labor and can be disassembled and installed at any time. According to the requirements of the experiment and the characteristics of different test bearings, the bench components can be quickly replaced to meet the experimental requirements.

[0007] The object of the present invention is achieved by providing a multi-purpose turbodrill thrust bearing life test bench, which adopts a vertical structure and comprises:

[0008] A test fixture is used for detachably clamping a test bearing; it comprises a hollow fixture body, a main shaft with a vertical central axis is arranged in the fixture body, a test bearing is sleeved on the main shaft, the main shaft can abut against the inner ring of the test bearing from one axial end and can drive the inner ring to rotate, and the fixture body abuts against the inner ring of the test bearing from the other axial end; the fixture body fixes the outer ring of the test bearing;

[0009] A driving system is connected to the main shaft and drives the inner ring of the test bearing to rotate through the main shaft; the driving system can adjust the rotation speed of the main shaft;

[0010] A loading system connected to one end of the main shaft, for applying an axial load to the inner ring of the test bearing through the main shaft;

[0011] A circulation system is communicated with the tool body and is used for circulating the test medium into the test tool.

[0012] In a preferred embodiment of the present invention, the drive system includes a variable frequency speed regulating motor, the central axis of the output shaft of the variable frequency speed regulating motor is vertically arranged; the output shaft is connected to the high-speed shaft through a speed increasing belt transmission structure; the high-speed shaft is coaxially connected to the main shaft.

[0013] In a preferred embodiment of the present invention, the loading system includes a load-bearing seat that can slide vertically, and the load-bearing seat is rotated inward from the bottom end to penetrate the loading shaft, and the loading shaft is sleeved with a load-bearing bearing. The top end of the load-bearing seat is abutted and connected to a loading hydraulic cylinder, and the bottom end of the loading shaft can be coaxial with the main shaft and abutted, and the loading hydraulic cylinder applies an axial load to the main shaft through the load-bearing seat, the load-bearing bearing and the loading shaft.

[0014] In a preferred embodiment of the present invention, a test bench is further included, wherein the test bench includes a lower base, the lower base is supported and connected to an upper base, and the upper base is connected to a column structure extending vertically upward;

[0015] The variable frequency speed regulating motor is arranged on the upper base; the two ends of the high-speed shaft are respectively hinged on the lower base and the upper base; the tooling body can be disassembled and fixedly connected to the column structure; the load-bearing bearing seat is located above the tooling body and can be slidably connected to the column structure, and the loading hydraulic cylinder can be disassembled and fixedly connected to the column structure and is located above the load-bearing bearing seat.

[0016] In a preferred embodiment of the present invention, the bottom end of the tooling body is fixedly connected to the tooling base, and the tooling base is connected to the column structure; a first step portion is provided on the outer wall of the main shaft, and the first step portion presses against the inner ring of the test bearing from the top end; a first sleeve is sleeved on the main shaft below the test bearing, and the first sleeve presses against the inner ring of the test bearing from the bottom end; a first nut is connected to the main shaft below the tooling base, and the first nut axially fixes the first sleeve.

[0017] In a preferred embodiment of the present invention, the top end of the tooling body can be detachably connected to the test bearing cover, a second step portion is provided on the inner wall of the tooling body, the second step portion presses against the outer ring of the test bearing from the bottom end, and the test bearing cover presses against the outer ring of the test bearing from the top end.

[0018] In a preferred embodiment of the present invention, a first rotating lip-type sealing ring is arranged between the test bearing cover and the main shaft, and an upper sealing end cover is arranged at the top end of the test bearing cover; a second rotating lip-type sealing ring is arranged between the first sleeve and the inner wall of the tooling body, and a lower sealing end cover is arranged at the bottom end of the tooling base.

[0019] In a preferred embodiment of the present invention, a load-bearing blind hole is arranged inwardly at the bottom end of the loading shaft, and the top end of the main shaft can be sleeved in the load-bearing blind hole and can axially press against the top surface of the load-bearing blind hole; the outer wall of the main shaft and the inner wall of the load-bearing blind hole are connected by a spline.

[0020] In a preferred embodiment of the present invention, the top end of the load-bearing seat is detachably connected to a hydraulic loading sleeve, and the loading hydraulic cylinder is connected to the hydraulic loading sleeve; the bottom end of the load-bearing seat is detachably connected to a loading bearing end cover; the hydraulic loading sleeve and the loading bearing end cover respectively press against the two ends of the outer ring of the load-bearing bearing.

[0021] In a preferred embodiment of the present invention, a third step portion is provided on the loading shaft, and the third step portion axially presses against the inner ring of the load-bearing bearing from the bottom end; a locking sleeve is sleeved on the loading shaft above the load-bearing bearing, and the top end of the loading shaft is connected to a second nut, and the second nut axially presses against the inner ring of the load-bearing bearing from the top end through the locking sleeve.

[0022] In a preferred embodiment of the present invention, the loading hydraulic cylinder includes a cylinder base, a cylinder barrel and a cylinder rod, the cylinder barrel is connected to the cylinder base, and the cylinder rod is sealed and slidably penetrated into the cylinder barrel from the bottom end; a loading sleeve connecting hole is provided on the hydraulic loading sleeve, and the bottom end of the cylinder rod is sleeved and connected to the loading sleeve connecting hole.

[0023] In a preferred embodiment of the present invention, the load-bearing bearing is a four-point contact ball bearing.

[0024] In a preferred embodiment of the present invention, there are two load-bearing bearings, an inner sleeve and an outer sleeve are arranged between the two load-bearing bearings, two ends of the inner sleeve respectively press against the inner rings of the two load-bearing bearings, and two ends of the outer sleeve respectively press against the outer rings of the two load-bearing bearings.

[0025] In a preferred embodiment of the present invention, the speed increasing belt transmission structure comprises a large pulley sleeved on the output shaft and a small pulley sleeved on the high speed shaft, and a transmission belt is sleeved on the large pulley and the small pulley.

[0026] In a preferred embodiment of the present invention, the high-speed shaft is a hollow shaft, and the top end of the high-speed shaft is connected to the main shaft via a spline.

[0027] In a preferred embodiment of the present invention, an electromagnetic speed sensor is disposed on one side of the high-speed shaft.

[0028] In a preferred embodiment of the present invention, the circulation system includes a mud pump and a water tank; a first joint is arranged on the tooling body above the test bearing, and a second joint is arranged on the tooling body below the test bearing, the mud pump is connected to the first joint through an inlet pipe, and the second joint is connected to the water tank through an outlet pipe.

[0029] As described above, the multi-purpose turbodrill thrust bearing life test bench of the present invention has the following beneficial effects:

[0030] The present invention adopts a vertical structure to better simulate the working conditions of the bearings. It mainly takes thrust ball bearings and PDC bearings as test objects. According to the analysis of the working environment of the test bearings and the calculation of relevant parameters, the mechanical part of the turbodrill thrust ball bearing and PDC bearing test bench is designed more completely. The test fixture adopts a detachable structure. The specifications of the fixture body and the main shaft can be adjusted according to the test bearings to meet the requirements of different characteristics of the test bearings; the drive system is used to adjust the spindle speed so that the speed required by the experiment is achieved; the loading system can realize the precise loading of the drilling pressure (axial load), and the medium environment of the test bearing is simulated by the circulation system. The loading system and the circulation system are used to simulate the real working conditions, which provides real and reliable conditions for testing turbodrill thrust ball bearings and PDC bearings, and provides a strong guarantee for the reliability of experimental test data.

[0031] The present invention adopts modular design, and the four sections of test fixture, drive system, loading system and circulation system have clear division of labor and can be disassembled and installed at any time. According to the requirements of the experiment and the characteristics of different test bearings, the bench parts can be quickly replaced to meet the experimental requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0033] in:

[0034] Figure 1 : It is the front view of the multi-purpose turbodrill thrust bearing life test bench of the present invention.

[0035] Figure 2 : It is a side view of the multi-purpose turbodrill thrust bearing life test bench of the present invention.

[0036] Figure 3 :for Figure 1 Enlarged view of point I in the middle.

[0037] Figure 4 :When the test bearing is a thrust ball bearing Figure 1 Enlarged view of point II in the middle.

[0038] Figure 5 :When the test bearing is a PDC bearing Figure 1 Enlarged view of point II in the middle.

[0039] Figure 6 : It is the schematic diagram of the circulation system of the present invention.

[0040] In the figure:

[0041] 1. Test tooling;

[0042] 11. Tool body;

[0043] 121, first main axis; 122, second main axis;

[0044] 13. Tooling base;

[0045] 14. First sleeve;

[0046] 15. First nut;

[0047] 16. Test bearing cap;

[0048] 171, a first rotating lip seal ring; 172, a second rotating lip seal ring;

[0049] 181, upper sealing end cover; 182, lower sealing end cover;

[0050] 191, first joint; 192, second joint;

[0051] 2. Drive system;

[0052] 21. Variable frequency speed regulating motor; 22. High speed shaft; 23. Electromagnetic speed sensor; 24. Large pulley; 25. Small pulley; 26. Transmission belt;

[0053] 3. Loading system;

[0054] 31. Load bearing seat; 311. Hydraulic loading sleeve; 312. Load bearing end cover; 313. Sliding sleeve;

[0055] 32. Loading shaft; 321. Load-bearing blind hole;

[0056] 33. Load bearing;

[0057] 34. Loading hydraulic cylinder; 341. Cylinder base; 342. Cylinder barrel; 343. Cylinder rod;

[0058] 35. Locking sleeve;

[0059] 36. Second nut;

[0060] 37. Inner bushing;

[0061] 38. Outer sleeve;

[0062] 4. Circulation system; 41. Mud pump; 42. Water tank;

[0063] 51. Thrust ball bearing; 52. PDC bearing;

[0064] 6. Test bench; 61. Lower base; 62. Upper base; 631. Support rod; 632. Sliding shaft. DETAILED DESCRIPTION

[0065] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0066] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0068] like Figures 1 to 6 As shown, the present invention provides a multi-purpose turbodrill thrust bearing life test bench, which adopts a vertical structure and the same arrangement as the turbodrill bearing group, and mainly includes:

[0069] The test fixture 1 is used for detachably clamping the test bearing; it comprises a hollow fixture body 11, a main shaft with a vertical central axis is arranged in the fixture body 11, a test bearing is sleeved on the main shaft, the main shaft can abut against the inner ring of the test bearing from one axial end and can drive it to rotate, and the fixture body 11 abuts against the inner ring of the test bearing from the other axial end; the fixture body 11 fixes the outer ring of the test bearing; the axial force on the main shaft will be borne by the bottom end of the fixture body 11 and will not be transmitted to the drive system;

[0070] The specifications of the fixture body and the main shaft can be adjusted according to the test bearing; the present invention mainly takes thrust ball bearings (four-point bearing group) and PDC bearings as test objects, and designs the mechanical parts of the turbodrill thrust ball bearing and PDC bearing test bench in a relatively complete manner according to the analysis of the working environment of the test bearing and the calculation of relevant parameters. The test fixture 1 adopts a detachable structure setting, and the overall modular design is designed. Different test fixtures and main shafts are designed according to the different characteristics of the thrust ball bearing and PDC thrust bearing. While facilitating operation and loading and unloading, in the specific embodiment of the present invention, the main shaft can select the first main shaft 121 suitable for the thrust ball bearing 51 (four-point bearing group), or select the second main shaft 122 suitable for the PDC bearing 52.

[0071] The driving system 2 is connected to the main shaft transmission, and drives the inner ring of the test bearing to rotate through the main shaft; the driving system 2 can adjust the rotation speed of the main shaft to meet the simulation of high-speed rotation of the turbodrill.

[0072] The loading system 3 is connected to one end of the main shaft and loads the axial load to the inner ring of the main shaft test bearing through the main shaft. The axial load simulates the drilling pressure, and the loading system 3 can realize the accurate loading of the drilling pressure (axial load), realize the simulation of the operating condition of the turbodrill thrust bearing, and realize the accurate simulation and control of the axial load of the turbodrill thrust bearing.

[0073] The circulation system 4 is connected to the tool body 11 and is used to circulate the test medium into the test tool 1. The test medium is clean water or prepared mud. On the one hand, it can simulate the downhole mud environment and interact with the test bearing; on the other hand, it can lubricate the test bearing through the medium and take away most of the heat in the test bearing. Through the circulation system 4, the working conditions of the downhole turbodrill thrust ball bearing and PDC bearing can be more closely simulated to ensure the accuracy of the test data.

[0074] The multi-purpose turbodrill thrust bearing life test bench of the present invention adopts a vertical structure, which better simulates the working conditions of the bearings. The thrust ball bearings and PDC bearings are mainly used as test objects. According to the analysis of the working environment of the test bearings and the calculation of relevant parameters, the mechanical parts of the turbodrill thrust ball bearings and PDC bearing test benches are designed relatively completely. The test fixture adopts a detachable structure, and the specifications of the fixture body and the main shaft can be adjusted according to the test bearings to meet the requirements of different characteristics of the test bearings; the drive system is used to adjust the main shaft speed so as to reach the speed required by the experiment; the loading system can realize the precise loading of the drilling pressure (axial load), and the medium environment of the test bearing is simulated by the circulation system. The loading system and the circulation system are used to simulate the real working conditions, which provides real and reliable conditions for testing turbodrill thrust ball bearings and PDC bearings, and provides a strong guarantee for the reliability of experimental test data.

[0075] The present invention adopts modular design, and the four sections of test fixture, drive system, loading system and circulation system have clear division of labor and can be disassembled and installed at any time. According to the requirements of the experiment and the characteristics of different test bearings, the bench parts can be quickly replaced to meet the experimental requirements.

[0076] Further, if Figure 1 , Figure 2 As shown, the drive system 2 includes a variable frequency speed regulating motor 21, the central axis of the output shaft of the variable frequency speed regulating motor 21 is vertically arranged; the output shaft is connected to the high-speed shaft 22 through a speed increasing belt transmission structure, and the speed reaches the required speed of the working condition after the speed increasing belt transmission structure; the high-speed shaft 22 is coaxially connected to the main shaft. The variable frequency speed regulating motor 21 can adjust the speed, and the speed increasing transmission through the speed increasing belt transmission structure makes the maximum speed reach 5000 rpm, which can meet the simulation of high-speed rotation of the turbodrill.

[0077] The motor output shaft is arranged in parallel with the main shaft, and the drilling pressure cannot be transmitted to the motor output shaft, which protects the motor. The friction transmission and speed increase of the speed increase belt transmission structure avoids the periodic impact vibration caused by the gear transmission, so that the test bearing can rotate smoothly at high speed. It can protect the motor when the test bearing fails and is overloaded.

[0078] Further, if Figure 1As shown, the speed increasing belt transmission structure includes a large pulley 24 sleeved on the output shaft and a small pulley 25 sleeved on the high speed shaft 22 , and a transmission belt 26 is sleeved on the large pulley 24 and the small pulley 25 .

[0079] In a specific embodiment, the transmission belt 26 adopts an SPZ type narrow V-belt. When overloaded, slippage will occur between the transmission belt 26 and the large pulley 24 and the small pulley 25, which can avoid damage to the variable frequency speed regulation motor 21. The flexible transmission has good flexibility and can effectively reduce impact, absorb vibration, and ensure the stability of the high-speed shaft 22 and the test fixture 1.

[0080] Further, if Figure 1 As shown, the high-speed shaft 22 is a hollow shaft, and the top of the high-speed shaft 22 is connected to the main shaft through a spline. The high-speed shaft 22 is connected to the main shaft through a spline, driving the main shaft to rotate at high speed. The inner hole of the high-speed shaft 22 is a spline hole, and a protruding spline is set on the outer wall of the main shaft. The two are axially fixedly connected through the spline. The circumferential positioning of the small pulley 25 and the high-speed shaft 22 is achieved by an A-type flat key.

[0081] The high-speed shaft 22 transmits the rotation speed of the small pulley 25 to the main shaft. The main shaft and the high-speed shaft 22 are connected by splines, and the two can slide relative to each other. The axial force on the main shaft is borne by the test fixture and will not be transmitted to the high-speed shaft 22, while the high-speed shaft 22 will transfer the torque to the main shaft.

[0082] Further, if Figure 1 As shown, an electromagnetic speed sensor 23 is provided on one side of the high-speed shaft 22. The electromagnetic speed sensor 23 can monitor the speed of the high-speed shaft 22 in real time, thereby measuring the spindle speed, and adjusting the frequency of the variable frequency speed regulating motor 21 to adjust the test set speed, thereby achieving precise control of the speed.

[0083] Further, if Figure 1 , Figure 2 , Figure 3 As shown, the loading system 3 includes a load-bearing seat 31 that can slide vertically. The load-bearing seat 31 rotates inward from the bottom end to penetrate a loading shaft 32. A load-bearing bearing 33 is sleeved on the loading shaft 32. The top end of the load-bearing seat 31 is abutted and connected to a loading hydraulic cylinder 34. The bottom end of the loading shaft 32 can be coaxial with the main shaft and abutted. The loading hydraulic cylinder 34 applies an axial load to the main shaft through the load-bearing seat 31, the load-bearing bearing 33 and the loading shaft 32.

[0084] The loading hydraulic cylinder 34 transmits the axial load to the load-bearing seat 31, and the load-bearing seat 31 transmits it to the loading shaft 32. The loading shaft 32, the load-bearing bearing 33 and the load-bearing seat 31 are arranged between the main shaft and the loading hydraulic cylinder 34. The loading shaft 32 can rotate with the main shaft relative to the load-bearing seat 31, and the torque of the main shaft will not be transferred to the loading hydraulic cylinder 34.

[0085] Further, if Figure 3 As shown, the bottom end of the loading shaft 32 is provided with a bearing blind hole 321 inwardly, and the bearing blind hole 321 is provided in a stepped hole; the top end of the main shaft can be sleeved in the bearing blind hole 321 and can axially abut against the top surface of the bearing blind hole; the outer wall of the main shaft and the inner wall of the bearing blind hole 321 are connected by splines. The loading shaft 32 is connected to the main shaft by splines, which avoids relative rotation between the shafts.

[0086] The top of the main shaft is connected to the loading shaft 32, and the loading shaft 32 applies axial force to the main shaft in a stepped form. At the same time, the main shaft transfers torque to the loading shaft 32 through the spline. The top of the main shaft adopts a conical surface design, and the spline is rounded on both sides to facilitate automatic rotation and docking when the loading hydraulic cylinder 34 is loaded.

[0087] Further, if Figure 3 As shown, the top end of the load-bearing seat 31 can be detachably connected to the hydraulic loading sleeve 311, and the loading hydraulic cylinder 34 is connected to the hydraulic loading sleeve 311; the bottom end of the load-bearing seat 31 can be detachably connected to the loading bearing end cover 312; the hydraulic loading sleeve 311 and the loading bearing end cover 312 respectively press against the two ends of the outer ring of the load-bearing 33.

[0088] Further, if Figure 3 As shown, a third step portion is provided on the loading shaft 32, and the third step portion axially presses against the inner ring of the load-bearing bearing 33 from the bottom end; a locking sleeve 35 is sleeved on the loading shaft 32 above the load-bearing bearing 33, and the top end of the loading shaft 32 is connected to the second nut 36, and the second nut 36 presses against the inner ring of the load-bearing bearing 33 from the top end axially through the locking sleeve 35.

[0089] Further, if Figure 1 , Figure 2 , Figure 3 As shown, the loading hydraulic cylinder 34 includes a cylinder base 341, a cylinder barrel 342 and a cylinder rod 343. The cylinder barrel 342 is connected to the cylinder base 341. In a specific embodiment, the cylinder barrel 342 is connected to the cylinder base 341 by a bolt M12×45; the cylinder rod 343 is sealed and slidably penetrated into the cylinder barrel 342 from the bottom end; a loading sleeve connecting hole is provided on the hydraulic loading sleeve 311, and the bottom end of the cylinder rod 343 is sleeved and connected to the loading sleeve connecting hole. The cylinder rod 343 is connected to the loading sleeve connecting hole by a thread.

[0090] Furthermore, the load-bearing bearing 33 adopts a four-point contact ball bearing.

[0091] In a specific embodiment, there are two load-bearing bearings 33, and an inner sleeve 37 and an outer sleeve 38 are arranged between the two load-bearing bearings 33. The two ends of the inner sleeve 37 respectively press against the inner rings of the two load-bearing bearings, and the two ends of the outer sleeve 38 respectively press against the outer rings of the two load-bearing bearings.

[0092] The four-point contact ball bearing can adapt to very large rotation speed and axial load. In order to ensure the concentricity of the loading shaft 32 and the main shaft, two four-point contact ball bearings are selected for use in combination to play a role in radial alignment.

[0093] Further, if Figure 1 , Figure 2 As shown, the present invention further includes a test bench 6, the test bench 6 includes a lower base 61, the lower base 61 is supported and connected to an upper base 62, and the upper base 62 is connected to a column structure extending vertically upward;

[0094] The variable frequency speed regulating motor 21 is arranged on the upper base 62; the two ends of the high speed shaft 22 are respectively hinged on the lower base 61 and the upper base 62, the minimum diameter of the high speed shaft 22 appears at the upper and lower ends where the bearings are installed, the inner diameter of the bearing is consistent with the minimum shaft diameter, and the outer ring of the bearing is fixed on the lower base 61 and the upper base 62;

[0095] The tooling body 11 can be disassembled and fixedly connected to the column structure; the bearing seat 31 is located above the tooling body 11 and can be slidably connected to the column structure, and the loading hydraulic cylinder 34 can be disassembled and fixedly connected to the column structure and is located above the bearing seat 31.

[0096] In a specific embodiment, the column structure includes a support rod 631 and a sliding shaft 632. The tool body 11 can be detached and fixedly installed on the support rod 631. The bearing seat 31 is slidably connected to the sliding shaft 632.

[0097] A flange ring plate is provided at the top of the bearing seat 31, and a sliding sleeve 313 is connected to the flange ring plate. The sliding sleeve 313 is slidingly sleeved on the sliding shaft 632. Under the push of the loading hydraulic cylinder 34, the bearing seat 31 can slide on the sliding shaft 632. After the loading hydraulic cylinder 34 drives the bearing seat 31 to lift, the work of disassembling and assembling the test fixture 1 can be realized.

[0098] Further, if Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, the bottom end of the tooling body 11 is fixedly connected to the tooling base 13, the tooling base 13 is connected to the support rod 631 of the column structure, and the sliding shaft 632 is detachably connected to the tooling base 13; the test tooling 1 is fixed by using the support rod 631 and bolts to ensure the stability of the test tooling 1 and the internal bearings during the test.

[0099] A first step portion is provided on the outer wall of the main shaft, and the first step portion presses against the inner ring of the test bearing from the top end. A first sleeve 14 is sleeved on the main shaft below the test bearing, and the first sleeve 14 presses against the inner ring of the test bearing from the bottom end. A first nut 15 is connected to the main shaft below the tooling base 13, and the first nut 15 fixes the first sleeve 14 axially.

[0100] Furthermore, the top of the tool body 11 can be detachably connected to the test bearing cover 16, and a second step portion is provided on the inner wall of the tool body 11, and the second step portion presses against the outer ring of the test bearing from the bottom end, and the test bearing cover 16 presses against the outer ring of the test bearing from the top end.

[0101] Furthermore, a first rotating lip seal ring 171 is arranged between the test bearing cover 16 and the main shaft, and an upper sealing end cover 181 is arranged at the top of the test bearing cover 16; a second rotating lip seal ring 172 is arranged between the first sleeve 14 and the inner wall of the tooling body 11, and a lower sealing end cover 182 is arranged at the bottom end of the tooling base 13.

[0102] The test fixture 1 adopts a modular design to simulate the state of the downhole thrust ball bearing group or PDC bearing group of the turbodrill. Figure 4 As shown, the thrust ball bearing 51 is placed vertically and coaxially in a tooling body 11 (sleeve), the two ends of the outer ring of the thrust ball bearing 51 are fixed by the test bearing cover 16 and the second step portion of the tooling body 11 respectively, the top end of the inner ring of the thrust ball bearing 51 is fixed by the first step portion of the first main shaft 121, and the bottom end of the inner ring of the thrust ball bearing 51 is axially fixed by the first sleeve 14 and the first nut 15. Figure 5 As shown, the PDC bearing 52 is fixed by a PDC-specific test spindle, namely, a second spindle 122, to form a test fixture.

[0103] To facilitate disassembly and assembly, the test fixture 1 is separated from the drive system 2 and the loading system 3. The power is transmitted through splines at both ends of the main shaft, and the axial force is transmitted through the shoulder at one end. When testing different bearing groups, only the test fixture needs to be replaced.

[0104] Further, if Figure 6 As shown, the circulation system 4 includes a mud pump 41 and a water tank 42; a first joint 191 is provided on the tool body 11 above the test bearing, and a second joint 192 is provided on the tool body 11 below the test bearing. The mud pump 41 is connected to the first joint 191 through an inlet pipe, and the second joint 192 is connected to the water tank 42 through an outlet pipe. The circulation system 4 also includes a control valve to control the flow of the test medium.

[0105] The test medium is clean water or prepared mud. On the one hand, it can simulate the downhole mud environment and interact with the test bearing; on the other hand, it can lubricate the test bearing through the medium and take away most of the heat in the test bearing. Through the circulation system, the working conditions of the downhole turbodrill thrust ball bearing 51 and the PDC bearing 52 can be more closely simulated to ensure the accuracy of the test data.

[0106] Embodiment 1:

[0107] The load bearing seat 31 is lifted to a certain height by providing power through the loading hydraulic cylinder 34, and the test bearing (thrust ball bearing 51 or PDC bearing 52) to be tested is installed in the test fixture 1.

[0108] The thrust ball bearing 51 is placed vertically and coaxially in a fixture body 11 (sleeve). The two ends of the outer ring of the thrust ball bearing 51 are fixed by the test bearing cover 16 and the second step of the fixture body 11 respectively. The top of the inner ring of the thrust ball bearing 51 is fixed by the first step of the first spindle 121. The bottom of the inner ring of the thrust ball bearing 51 is axially fixed by the first sleeve 14 and the first nut 15. The PDC bearing 52 is fixed by the PDC special test spindle, that is, the second spindle 122, to complete the assembly of the test fixture. The test fixture is installed on the support rod 631 of the test bench, and the test fixture 1 is fixed to ensure the stability of the test fixture and the internal bearing during the test.

[0109] After the installation of the test fixture 1 is completed, the cylinder rod 343 of the loading hydraulic cylinder 34 is extended to push the load-bearing bearing seat 31 downward, and the load-bearing blind hole 321 of the loading shaft 32 is sleeved on the top of the main shaft. The loading hydraulic cylinder 34 applies pressure through the loading shaft 32 to fix the test fixture 1. At the same time, it can provide axial pressure to the test bearing in the test fixture 1 to simulate the actual working conditions.

[0110] The bottom end of the main shaft is connected to the high-speed shaft 22 through a spline, and the high-speed shaft 22 transfers the torque to the main shaft, while the axial force applied by the loading system is not loaded on the high-speed shaft 22. The top end of the main shaft is connected to the loading shaft 32, and the loading shaft 32 applies axial force to the main shaft in the form of a stepped shaft. The top end of the main shaft adopts a conical shape, and the spline is rounded on both sides to facilitate automatic rotation and docking when the loading hydraulic cylinder 34 is loaded, so as to ensure the stability of the turbodrill thrust bearing and the PDC bearing test bench during the entire test process.

[0111] After the test bearing is loaded with axial force, the circulation system 4 is opened, and a medium (clean water or prepared mud) is injected from the first joint 191 to simulate the downhole mud environment, interact with the test bearing, and lubricate the test bearing through the medium at the same time, taking away most of the heat in the test bearing to ensure the accuracy of the test results. After the test simulates the actual working conditions, the variable frequency speed regulating motor 21 is turned on, and power is transmitted to the high-speed shaft 22 through the large pulley 24, the small pulley 25, and the transmission belt 26. The high-speed shaft 22 then transmits the power to the main shaft to drive the test bearing to rotate. The electromagnetic speed sensor 23 can measure the speed of the high-speed shaft 22 and adjust the speed to meet the test requirements.

[0112] As described above, the multi-purpose turbodrill thrust bearing life test bench of the present invention has the following beneficial effects:

[0113] The present invention adopts a vertical structure to better simulate the working conditions of the bearings. It mainly takes thrust ball bearings and PDC bearings as test objects. According to the analysis of the working environment of the test bearings and the calculation of relevant parameters, the mechanical part of the turbodrill thrust ball bearing and PDC bearing test bench is designed more completely. The test fixture adopts a detachable structure. The specifications of the fixture body and the main shaft can be adjusted according to the test bearings to meet the requirements of different characteristics of the test bearings; the drive system is used to adjust the spindle speed so that the speed required by the experiment is achieved; the loading system can realize the precise loading of the drilling pressure (axial load), and the medium environment of the test bearing is simulated by the circulation system. The loading system and the circulation system are used to simulate the real working conditions, which provides real and reliable conditions for testing turbodrill thrust ball bearings and PDC bearings, and provides a strong guarantee for the reliability of experimental test data.

[0114] The present invention adopts modular design, and the four sections of test fixture, drive system, loading system and circulation system have clear division of labor and can be disassembled and installed at any time. According to the requirements of the experiment and the characteristics of different test bearings, the bench parts can be quickly replaced to meet the experimental requirements.

[0115] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A multi-purpose turbodrill thrust bearing life test bench, characterized in that: It adopts vertical structure, including: A test fixture is used for detachably clamping a test bearing; it comprises a hollow fixture body, a main shaft with a vertical central axis is arranged in the fixture body, a test bearing is sleeved on the main shaft, the main shaft can abut against the inner ring of the test bearing from one axial end and can drive the inner ring to rotate, and the fixture body abuts against the inner ring of the test bearing from the other axial end; the fixture body fixes the outer ring of the test bearing; A driving system is connected to the main shaft and drives the inner ring of the test bearing to rotate through the main shaft; the driving system can adjust the rotation speed of the main shaft; A loading system connected to one end of the main shaft, for applying an axial load to the inner ring of the test bearing through the main shaft; A circulation system is communicated with the tool body and is used for circulating the test medium into the test tool.

2. The multi-purpose turbodrill thrust bearing life test bench according to claim 1, characterized in that: The driving system comprises a variable frequency speed regulating motor, the central axis of the output shaft of the variable frequency speed regulating motor is vertically arranged; the output shaft is connected to a high-speed shaft via a speed increasing belt transmission structure; the high-speed shaft is coaxially connected to the main shaft.

3. The multi-purpose turbodrill thrust bearing life test bench according to claim 2, characterized in that: The loading system includes a load-bearing seat that can slide vertically, and the load-bearing seat is rotated inward from the bottom end to penetrate a loading shaft, and a load-bearing bearing is sleeved on the loading shaft. The top end of the load-bearing seat is abutted and connected to a loading hydraulic cylinder, and the bottom end of the loading shaft can be coaxial with the main shaft and abutted, and the loading hydraulic cylinder applies an axial load to the main shaft through the load-bearing seat, the load-bearing bearing and the loading shaft.

4. The multi-purpose turbodrill thrust bearing life test bench according to claim 3, characterized in that: It also includes a test bench, the test bench includes a lower base, the lower base is supported and connected to an upper base, and the upper base is connected to a column structure extending vertically upward; The variable frequency speed regulating motor is arranged on the upper base; the two ends of the high-speed shaft are respectively hinged on the lower base and the upper base; the tooling body can be disassembled and fixedly connected to the column structure; the load-bearing bearing seat is located above the tooling body and can be slidably connected to the column structure, and the loading hydraulic cylinder can be disassembled and fixedly connected to the column structure and is located above the load-bearing bearing seat.

5. The multi-purpose turbodrill thrust bearing life test bench according to claim 4, characterized in that: The bottom end of the tooling body is fixedly connected to the tooling base, and the tooling base is connected to the column structure; a first step portion is arranged on the outer wall of the main shaft, and the first step portion presses against the inner ring of the test bearing from the top end; a first sleeve is sleeved on the main shaft below the test bearing, and the first sleeve presses against the inner ring of the test bearing from the bottom end; a first nut is connected to the main shaft below the tooling base, and the first nut axially fixes the first sleeve.

6. The multi-purpose turbodrill thrust bearing life test bench according to claim 5, characterized in that: The top end of the tool body is detachably connected to the test bearing cover, a second step portion is arranged on the inner wall of the tool body, the second step portion abuts against the outer ring of the test bearing from the bottom end, and the test bearing cover abuts against the outer ring of the test bearing from the top end.

7. The multi-purpose turbodrill thrust bearing life test bench according to claim 6, characterized in that: A first rotating lip-shaped sealing ring is arranged between the test bearing cover and the main shaft, and an upper sealing end cover is arranged at the top end of the test bearing cover; a second rotating lip-shaped sealing ring is arranged between the first sleeve and the inner wall of the tooling body, and a lower sealing end cover is arranged at the bottom end of the tooling base.

8. The multi-purpose turbodrill thrust bearing life test bench according to claim 3, characterized in that: A bearing blind hole is arranged inwardly at the bottom end of the loading shaft, and the top end of the main shaft can be sleeved in the bearing blind hole and can axially abut against the top surface of the bearing blind hole; the outer wall of the main shaft and the inner wall of the bearing blind hole are connected by splines.

9. The multi-purpose turbodrill thrust bearing life test bench according to claim 3, characterized in that: The top end of the load-bearing seat is detachably connected to a hydraulic loading sleeve, and the loading hydraulic cylinder is connected to the hydraulic loading sleeve; the bottom end of the load-bearing seat is detachably connected to a loading bearing end cover; the hydraulic loading sleeve and the loading bearing end cover respectively press against the two ends of the outer ring of the load-bearing bearing.

10. The multi-purpose turbodrill thrust bearing life test bench according to claim 9, characterized in that: A third step portion is provided on the loading shaft, and the third step portion axially presses against the inner ring of the load-bearing bearing from the bottom end; a locking sleeve is sleeved on the loading shaft above the load-bearing bearing, and the top end of the loading shaft is connected to a second nut, and the second nut axially presses against the inner ring of the load-bearing bearing from the top end through the locking sleeve.

11. The multi-purpose turbodrill thrust bearing life test bench according to claim 9, characterized in that: The loading hydraulic cylinder includes a cylinder base, a cylinder barrel and a cylinder rod, the cylinder barrel is connected to the cylinder base, and the cylinder rod is sealed and slidably penetrated into the cylinder barrel from the bottom end; a loading sleeve connecting hole is provided on the hydraulic loading sleeve, and the bottom end of the cylinder rod is sleeved and connected to the loading sleeve connecting hole.

12. The multi-purpose turbodrill thrust bearing life test bench according to claim 3, characterized in that: The load-bearing bearing is a four-point contact ball bearing.

13. The multi-purpose turbodrill thrust bearing life test bench according to claim 3, characterized in that: There are two load-bearing bearings, an inner sleeve and an outer sleeve are arranged between the two load-bearing bearings, two ends of the inner sleeve respectively press against the inner rings of the two load-bearing bearings, and two ends of the outer sleeve respectively press against the outer rings of the two load-bearing bearings.

14. The multi-purpose turbodrill thrust bearing life test bench according to claim 2, characterized in that: The speed increasing belt transmission structure comprises a large pulley sleeved on the output shaft and a small pulley sleeved on the high speed shaft, and a transmission belt is sleeved on the large pulley and the small pulley.

15. The multi-purpose turbodrill thrust bearing life test bench according to claim 2, characterized in that: The high-speed shaft is a hollow shaft, and the top end of the high-speed shaft is connected to the main shaft via a spline.

16. The multi-purpose turbodrill thrust bearing life test bench according to claim 2, characterized in that: An electromagnetic speed sensor is arranged on one side of the high-speed shaft.

17. The multi-purpose turbodrill thrust bearing life test bench according to claim 1, characterized in that: The circulation system includes a mud pump and a water tank; a first joint is arranged on the tool body above the test bearing, and a second joint is arranged on the tool body below the test bearing. The mud pump is connected to the first joint through an inlet pipe, and the second joint is connected to the water tank through an outlet pipe.

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