Fatigue life testing equipment for corrugated pipe for oil field drill bit

Abstract

The invention relates to the technical field of corrugated pipe testing, and discloses corrugated pipe fatigue life testing equipment for an oil field drill bit, the corrugated pipe fatigue life testing equipment comprises a motor and a to-be-tested corrugated pipe assembly, an initial angle is formed between one end, far away from the motor, of the to-be-tested corrugated pipe assembly and the axis direction of the motor, and the to-be-tested corrugated pipe assembly is driven by the motor to test the fatigue life of the to-be-tested corrugated pipe assembly. The to-be-tested corrugated pipe assembly performs conical swing around the axial lead direction of the output shaft of the motor, one end, far away from the motor, of the to-be-tested corrugated pipe assembly is provided with a valve and a pressure sensor, and the valve is used for inflating the interior of the to-be-tested corrugated pipe assembly. The corrugated pipe fatigue testing device can well simulate the actual application working condition of the corrugated pipe for the oil field drill bit, is compact in overall structure, small in occupied area, convenient to maintain, high in automation degree, low in operation intensity, capable of testing corrugated pipes of different specifications in a fatigue mode and good in universality.

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] In the process of deep well oilfield exploitation, the bellows in the drill bit mainly plays the role of transmitting torque and needs to have a certain angular compensation effect. As the drilling depth of the drill bit increases, the internal pressure of the bellows continues to increase, and fatigue failure is more likely to occur, resulting in frequent replacement of the drill bit bellows, which increases the cost of using the product.

[0003] In order to develop a bellows suitable for this working condition, it is necessary to simulate the actual working condition to perform fatigue test on the designed bellows. The bellows can be assembled and used only after the test is qualified. At present, the bellows fatigue test platform for oilfield drill bits is still in the development stage, and the market urgently needs such testing equipment to verify the performance of bellows. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a fatigue life testing device 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 applications, replacement is frequent, and the overall cost of use is increased.

[0006] (II) 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 comprises a motor and a bellows assembly to be tested, wherein one end of the bellows assembly to be tested away from the motor has an initial angle with the axial direction of the motor, and the bellows assembly to be tested, driven by the motor, makes a conical swing around the axial direction of the motor output shaft, and one end of the bellows assembly to be tested away from the motor is provided with a valve and a pressure sensor, respectively, wherein 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, and a Hall sensor for detecting the number of rotations is arranged on the outer side 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 fixedly arranged 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 by a working 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 fasteners, and the driven shaft passes through the lower cover and is fixedly connected 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 surface of the left end cover, the upper pressure cover and the lower pressure cover.

[0012] Preferably, the driving shaft is rotatably connected with a first seat bearing, and the first seat bearing is fixedly arranged on the base plate through a left stand, and the end of the driven shaft away from the lower pressure cover is rotatably connected with a second seat bearing, and the second seat bearing is fixedly arranged on the base plate through a right stand, and the right stand is processed 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] (III) Beneficial effects

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

[0017] The fatigue life test equipment for bellows used in oilfield drill bits drives the bellows assembly to be tested to make a conical swing through a motor. 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 test 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 fatigue failure, and cooperates with the Hall sensor to obtain 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 overall structure of the main view 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 splitting structure of the present invention;

[0021] Figure 4 It 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 schematic 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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 test 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, driven by the motor 1, makes a conical swing around the axis direction of the output shaft of the motor 1, and 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 inside 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 make a 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 a similar actual state; 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 arranged on the bottom plate 2 through the motor support 3, the output shaft end of the motor 1 is fixedly connected to the driving shaft 5 through the coupling 4, one end of the driving shaft 5 is fixedly connected to the three-jaw chuck 8, and one end of the bellows assembly 9 to be tested is fixedly connected to the three-jaw chuck 8. The three-jaw chuck 8 is provided to facilitate the rapid clamping or replacement of the bellows assembly 9 to be tested of different specifications of the entire test equipment, thereby improving the detection 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 fixedly arranged at both ends, one end of the bellows 92 to be tested is fixedly connected to a left end cover 91 by means of a top screw, the left end cover 91 is clamped and fixed in the three-jaw chuck 8, the left end cover 91 is located at one end of the inner cavity of the bellows 92 to be tested, and is movably connected to a driven shaft 94 by a working spherical hinge 93, the flange of the end of the bellows 92 to be tested away from the left end cover 91 is pressed and fixed to one side of a lower pressure cover 96 by an upper pressure cover 95 with fasteners, and the driven shaft 94 passes through the lower pressure cover 96 and is fixedly connected to the lower pressure cover 96. The left end cover 91 of the bellows assembly 9 to be tested is connected to the motor 1 through the driving shaft 5, the lower pressure cover 96 is connected to the support through the driven shaft 94, and the driving shaft 5 and the driven shaft 94 are connected through a spherical hinge 93. During the initial installation, since the driving end and the driven end axis of the bellows assembly 9 to be tested form a certain angle, the intersection of the two axes is located at the center of the bellows assembly 9 to be tested. When the motor 1 is started, the driving end of the bellows assembly 9 to be tested rotates around the driving end, and at the same time drives the driven end to rotate around the driven shaft 94. Since the driven shaft 94 and the driving shaft 5 of the motor 1 have a certain angle, the driven end of the bellows assembly 9 to be tested performs a conical motion around the swing center when swinging, and tries to fit the actual motion trajectory.

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

[0030] In this embodiment, the driving shaft 5 is rotatably connected to a first seat bearing 6, which 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, which 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. The sensor bracket 14 is fixed to the base plate 2 by screws. The magnet is fixedly arranged on the radial edge of the end face of the lower pressure cover 96. 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 circumferentially fixed by screws.

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

[0034] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bellows fatigue life test device 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 makes a conical swing 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 outer side of one end of the bellows assembly to be tested.

2. The fatigue life testing equipment for bellows used in oilfield drill bits according to claim 1, characterized in that: The motor is fixedly mounted on a bottom plate via a motor support, an output shaft end of the motor is fixedly connected to a 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.

3. The fatigue life testing equipment for bellows used in oilfield drill bits according to claim 2, characterized in that: The bellows assembly to be tested includes a bellows to be tested with flanges fixedly arranged 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, one end of the left end cover located in the inner cavity of the bellows to be tested is movably connected to a driven shaft by a working spherical hinge, 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 fasteners, and the driven shaft passes through the lower cover and is fixedly connected to the lower cover.

4. The fatigue life testing equipment for bellows used in oilfield drill bits according to claim 3 is characterized by: Sealing rings are arranged at the joints between the upper flange of the bellows to be tested and the end surface of the left end cover, the upper gland and the lower gland.

5. The fatigue life testing equipment for bellows used in oilfield drill bits according to claim 4, characterized in that: The driving shaft is rotatably connected with a first bearing seat, and the first bearing seat is fixed on the base plate through a left stand. The driven shaft is rotatably connected with a second bearing seat at one end away from the lower pressure cover, and the second bearing seat is fixed on the base plate through a right stand. The right stand is processed with an inclined surface, and the driving shaft and the driven shaft are installed at a certain angle.

6. The fatigue life testing equipment for bellows used in oilfield drill bits according to claim 5, characterized in that: The Hall sensor is used in conjunction with a magnet. The Hall sensor is fixed to a sensor bracket by screws. The sensor bracket is fixed to a base plate by screws. The magnet is fixed to a radial edge on the end face of the lower pressure cover. The probe of the Hall sensor should be close to the radial edge of the lower pressure cover.

7. The fatigue life testing equipment for bellows used in oilfield drill bits according to claim 6, 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 shaft, and the upper pressure cover and the lower pressure cover are circumferentially fixed by screws.

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