A bellows fatigue life testing device for oilfield drill bits

Abstract

The present invention relates to the field of bellows testing technology, and discloses a bellows fatigue life testing device for oilfield drill bits, comprising a motor and a bellows assembly to be tested, wherein the end of the bellows assembly to be tested away from the motor has an initial angle with the axis of the motor, and the bellows assembly to be tested, driven by the motor, swings in a conical shape around the axis of the motor output shaft, and the end of the bellows assembly to be tested away from the motor is provided with a valve and a pressure sensor, and the valve is used to inflate the interior of the bellows assembly to be tested. The present invention can well simulate the actual application conditions of bellows for oilfield drill bits, has a compact overall structure, occupies a small area, is easy to maintain, has a high degree of automation, has low operating intensity, can fatigue test bellows of different specifications, and has good versatility.

Description

Technical Field

[0001] The invention relates to the technical field of bellows testing, in particular to a bellows fatigue life testing device for oilfield drill bits. Background Art

[0002] During deep-well oilfield production, the bellows in the drill bit primarily transmits torque and requires a certain degree of angular compensation. As the drill bit penetrates deeper, the internal pressure on the bellows increases, making fatigue failure more likely. This leads to frequent replacement of the bellows, increasing product costs.

[0003] To develop a bellows suitable for these working conditions, fatigue testing must be performed on the designed bellows under simulated working conditions. Only after passing the test can the bellows be assembled and used. Currently, the fatigue testing platform for bellows used in oilfield drill bits is still under development, and there is an urgent need for such testing equipment to verify the performance of bellows. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides a fatigue life testing equipment for bellows used in oilfield drill bits, which solves the problem that the existing transmission bellows used in oilfield drill bits lack a dedicated fatigue testing platform, fatigue failure is easy to occur in actual application, replacement is frequent, and the overall cost of use is increased.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A bellows fatigue life testing device for oilfield drill bits includes a motor and a bellows assembly to be tested, wherein the end of the bellows assembly to be tested away from the motor has an initial angle with the axis direction of the motor. Driven by the motor, the bellows assembly to be tested swings in a conical shape around the axis direction of the motor output shaft. The end of the bellows assembly to be tested away from the motor is respectively provided with a valve and a pressure sensor. The valve is used to inflate the interior of the bellows assembly to be tested, and the pressure sensor is used to detect the internal pressure of the bellows assembly to be tested. A Hall sensor for detecting the number of rotations is arranged on the outside of one end of the bellows assembly to be tested.

[0009] Preferably, the motor is fixedly mounted on the base plate via a motor support, the output shaft end of the motor is fixedly connected to the driving shaft via a coupling, one end of the driving shaft is fixedly connected to a three-jaw chuck, and one end of the bellows assembly to be tested is fixedly connected to the three-jaw chuck.

[0010] Preferably, the bellows assembly to be tested includes a bellows to be tested with flanges fixed at both ends, one end of the bellows to be tested is fixedly connected to a left end cover by means of a top screw, the left end cover is clamped and fixed in the three-jaw chuck, the left end cover is located at one end of the inner cavity of the bellows to be tested and is movably connected to a driven shaft through a spherical hinge connection, the flange of the end of the bellows to be tested away from the left end cover is pressed and fixed to one side of the lower cover by an upper cover and a fastener, and the driven shaft passes through the lower cover and is fixed to the lower cover.

[0011] Preferably, sealing rings are provided at the joints between the upper flange of the bellows to be tested and the end face of the left end cover, the upper gland and the lower gland.

[0012] Preferably, the driving shaft is rotatably connected to a first seat bearing, the first seat bearing is fixedly arranged on the base plate through a left stand, the driven shaft is rotatably connected to an end thereof away from the lower pressure cover with a second seat bearing, the second seat bearing is fixedly arranged on the base plate through a right stand, the right stand is machined with an inclined surface, and the driving shaft and the driven shaft are installed at a certain angle.

[0013] Preferably, the Hall sensor is used in conjunction with a magnet, the Hall sensor is fixed to the sensor bracket by screws, the sensor bracket is fixed to the base plate by screws, the magnet is fixedly arranged on the radial edge of the end face of the lower pressure cover, and the probe of the Hall sensor should be close to the radial edge of the lower pressure cover.

[0014] Preferably, the movable end of the spherical hinge is threadedly connected to the driven shaft, the driven shaft passes through the hole of the lower pressure cover and is axially limited by a pin, and the upper pressure cover and the lower pressure cover are circumferentially fixed by screws.

[0015] (3) Beneficial effects

[0016] The present invention has the following beneficial effects:

[0017] The fatigue life testing equipment for bellows used in oilfield drill bits uses a motor to drive the bellows assembly to be tested to perform conical swing. The initial installation angle is to make the bellows assembly to be tested move in a conical trajectory when in motion, so as to fit the actual motion trajectory as much as possible, thereby achieving fatigue life testing of the bellows used in oilfield drill bits under similar actual conditions; through the provided valves and pressure sensors, the bellows assembly to be tested is ventilated in advance to form a certain pressure. When the bellows assembly to be tested is broken or leaking, the pressure sensor detects the pressure change, thereby judging that the bellows has fatigued and failed. The Hall sensor is used to determine the number of rotations of the bellows to be tested at this time, and the fatigue service life of the bellows assembly to be tested is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic diagram of the main overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the AA-direction cross-section structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the component disassembly structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the overall structure of the right vertical plate of the present invention;

[0022] Figure 5 It is a front view structural diagram of the right vertical plate of the present invention.

[0023] In the figure: 1. Motor; 2. Base plate; 3. Motor support; 4. Coupling; 5. Driving shaft; 6. First bearing seat; 7. Left stand; 8. Three-jaw chuck; 9. Bellows assembly to be tested; 91. Left end cover; 92. Bellows to be tested; 93. Spherical hinge; 94. Driven shaft; 95. Upper pressure cover; 96. Lower pressure cover; 97. Sealing ring; 10. Valve; 11. Right stand; 12. Second bearing seat; 13. Pressure sensor; 14. Sensor bracket; 15. Hall sensor. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1 The present invention provides a technical solution: a bellows fatigue life testing device for oilfield drill bits, comprising a motor 1 and a bellows assembly to be tested, wherein the end of the bellows assembly 9 to be tested away from the motor 1 has an initial angle with the axis direction of the motor 1, and the bellows assembly to be tested is driven by the motor 1 and swings in a conical shape around the axis direction of the output shaft of the motor 1. The end of the bellows assembly 9 to be tested away from the motor 1 is respectively provided with a valve 10 and a pressure sensor 13, the valve 10 is used to inflate the interior of the bellows assembly 9 to be tested, the pressure sensor 13 is used to detect the internal pressure of the bellows assembly 9 to be tested, and a Hall sensor 15 for detecting the number of rotations is arranged on the outer side of one end of the bellows assembly 9 to be tested.

[0026] In the present invention, the motor 1 drives the bellows assembly 9 to be tested to perform conical swing. The initial installation angle is to make the bellows assembly 9 to be tested move in a conical trajectory when it is in action, so as to fit the actual motion trajectory as much as possible, thereby achieving a fatigue life test of the bellows for oil field drill bits under similar actual conditions; the valve 10 and the pressure sensor 13 are set to ventilate the bellows assembly 9 to be tested in advance to form a certain pressure. When the bellows assembly 9 to be tested is broken or leaked, the pressure sensor 13 detects the pressure change, thereby judging that the bellows has fatigue failure, and cooperates with the Hall sensor 15 to obtain the number of rotations of the bellows 92 to be tested at this time, and the fatigue service life of the bellows assembly 9 to be tested is obtained.

[0027] Reference Figure 1 and 3 As shown, in this embodiment, the motor 1 is fixedly mounted on the base plate 2 via a motor support 3. The output shaft end of the motor 1 is fixedly connected to the driving shaft 5 via a coupling 4. One end of the driving shaft 5 is fixedly connected to a three-jaw chuck 8. One end of the bellows assembly 9 to be tested is fixedly connected to the three-jaw chuck 8. The provision of the three-jaw chuck 8 facilitates the rapid installation and replacement of bellows assemblies 9 to be tested of different specifications throughout the test equipment, thereby improving testing efficiency.

[0028] Reference Figure 2 As shown, in this embodiment, the bellows assembly 9 to be tested includes a bellows 92 to be tested with flanges fixed at both ends. One end of the bellows 92 to be tested is fixedly connected to a left end cap 91 by means of a top screw. The left end cap 91 is clamped and fixed in the three-jaw chuck 8. The left end cap 91 is located in the inner cavity of the bellows 92 to be tested and is movably connected to a driven shaft 94 by a spherical hinge 93. The flange of the end of the bellows 92 to be tested away from the left end cap 91 is pressed and fixed to one side of the lower pressure cap 96 by an upper pressure cap 95 with fasteners. The driven shaft 94 passes through the lower pressure cap 96 and is fixedly connected to the lower pressure cap 96. The left end cap 91 of the bellows assembly 9 to be tested is connected to the motor 1 through the driving shaft 5, the lower pressure cap 96 is connected to the support through the driven shaft 94, and the driving shaft 5 and the driven shaft 94 are connected by a spherical hinge 93. During initial installation, the axes of the driving and driven ends of the bellows assembly 9 under test form a predetermined angle, with the intersection of these two axes located at the center of the bellows assembly 9. When the motor 1 is started, the driving end of the bellows assembly 9 under test rotates around the driving end, simultaneously driving the driven end to rotate around the driven shaft 94. Because the driven shaft 94 forms a predetermined angle with the driving shaft 5 of the motor 1, the driven end of the bellows assembly 9 under test swings in a conical motion around the center of the swing, closely matching the actual motion trajectory.

[0029] Reference Figure 2As shown, in this embodiment, sealing rings 97 are provided at the joints between the upper flange of the tested bellows 92 and the end surface of the left end cap 91, the upper gland 95, and the lower gland 96. To ensure airtightness within the tested bellows 92, the connections between the left end cap 91, the upper gland 95, the lower gland 96, the driven shaft 94, and the tested bellows 92 are all sealed with sealing rings 97.

[0030] In this embodiment, the driving shaft 5 is rotatably connected to a first seat bearing 6, and the first seat bearing 6 is fixedly set on the base plate 2 through a left stand 7. The end of the driven shaft 94 away from the lower pressure cover 96 is rotatably connected to a second seat bearing 12, and the second seat bearing 12 is fixedly set on the base plate 2 through a right stand 11. The right stand 11 is processed with an inclined surface, and the driving shaft 5 and the driven shaft 94 are installed at a certain angle.

[0031] In this embodiment, the Hall sensor 15 is used in conjunction with a magnet. The Hall sensor 15 is fixed to the sensor bracket 14 by screws, and the sensor bracket 14 is fixed to the base plate 2 by screws. The magnet is fixed to the radial edge of the end face of the lower pressure cover 96, and the probe of the Hall sensor 15 should be close to the radial edge of the lower pressure cover 96.

[0032] In this embodiment, the movable end of the spherical hinge 93 is threadedly connected to the driven shaft 94, the driven shaft 94 passes through the hole of the lower pressure cover 96 and is axially limited by a pin, and the upper pressure cover 95 and the lower pressure cover 96 are fixed circumferentially by screws.

[0033] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations. The phrase "includes an element defined by..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0034] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A bellows fatigue life tester for oilfield drill bits, comprising a motor and a bellows assembly to be tested, characterized in that: The end of the bellows assembly to be tested away from the motor has an initial angle with the axis direction of the motor. Driven by the motor, the bellows assembly to be tested swings in a conical shape around the axis direction of the motor output shaft. The end of the bellows assembly to be tested away from the motor is provided with a valve and a pressure sensor. The valve is used to inflate the interior of the bellows assembly to be tested, and the pressure sensor is used to detect the internal pressure of the bellows assembly to be tested. A Hall sensor for detecting the number of rotations is arranged on the outside of one end of the bellows assembly to be tested. The motor is fixedly mounted on the bottom plate through a motor support, and the output shaft end of the motor is fixedly connected to the bottom plate through a coupling. It is connected to a driving shaft, one end of the driving shaft is fixedly connected to a three-jaw chuck, and one end of the bellows assembly to be tested is fixedly connected to the three-jaw chuck; the bellows assembly to be tested includes a bellows to be tested with flanges fixedly provided at both ends, one end of the bellows to be tested is fixedly connected to a left end cover by means of a top screw, the left end cover is clamped and fixed in the three-jaw chuck, and the end of the left end cover located in the inner cavity of the bellows to be tested is movably connected to a driven shaft through a spherical hinge connection, the flange of the bellows to be tested away from the left end cover is pressed and fixed to one side of the lower cover by the upper cover and fasteners, and the driven shaft passes through the lower cover and is fixed to the lower cover.

2. The fatigue life testing equipment for bellows used in oilfield drill bits according to claim 1, characterized in that: Sealing rings are provided at the joints between the upper flange of the bellows to be tested and the end face of the left end cover, the upper gland and the lower gland.

3. The fatigue life testing equipment for bellows used in oilfield drill bits according to claim 2, characterized in that: The driving shaft is rotatably connected to a first seat bearing, and the first seat bearing is fixedly arranged on the base plate through a left stand. The driven shaft is rotatably connected to an end of the driven shaft away from the lower pressure cover with a second seat bearing, and the second seat bearing is fixedly arranged on the base plate through a right stand. The right stand is machined with an inclined surface, and the driving shaft and the driven shaft are installed at a certain angle.

4. The fatigue life testing equipment for bellows used in oilfield drill bits according to claim 3, characterized in that: The Hall sensor is used in conjunction with a magnet. The Hall sensor is fixed to the sensor bracket by screws, and the sensor bracket is fixed to the base plate by screws. The magnet is fixedly arranged on the radial edge of the end face of the lower pressure cover, and the probe of the Hall sensor should be close to the radial edge of the lower pressure cover.

5. The fatigue life testing equipment for bellows used in oilfield drill bits according to claim 4, characterized in that: The movable end of the spherical hinge is threadedly connected to the driven shaft, the driven shaft passes through the hole of the lower pressure cover and is axially limited by a pin, and the upper pressure cover and the lower pressure cover are fixed circumferentially by screws.

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