A combined sucker rod fatigue test clamping device

Abstract

The present invention relates to the field of sucker rod detection technology, and specifically to a combined sucker rod fatigue test clamping device, comprising a circular ring seat, a circular ring block is fixedly connected to the side wall of the circular ring seat, a circular ring cavity is opened on the inner wall of the circular ring block, a plurality of tooth plates are uniformly penetrated and slidably connected to the inner wall of the circular ring cavity, a rectangular cavity is opened on the inner wall of the tooth plate, a sliding plug is sealed and slidably connected to the inside of the rectangular cavity, a buffer groove is uniformly opened on the inner wall of the circular ring cavity, and each of the inner walls of the buffer groove is elastically connected to an extension rod through a reset spring, and the extension rod is fixedly connected to the side wall of the sliding plug after penetrating the inner wall of the adjacent tooth plate, and a rubber-plastic clamping plate is fixedly connected to one end of the tooth plate. The present invention provides structures such as tooth plates, synchronous racks and cleaning plates, and when the combined sucker rod is subjected to fatigue testing, the surface of the combined sucker rod is first cleaned to prevent impurities such as oil stains from affecting the detection effect of subsequent crack detectors and the clamping effect of the rubber-plastic clamping plate.

Description

Technical Field

[0001] The invention relates to the technical field of sucker rod detection, and in particular to a combined sucker rod fatigue test clamping device. Background Art

[0002] The sucker rod fatigue test is to test the limit of the sucker rod under long-term stress. The test is mainly carried out under different loads, frequencies, amplitudes, working cycles, etc. The test results can determine whether the structural design of the sucker rod is reasonable and reliable, and provide a theoretical basis for improving and formulating new production standards and technologies.

[0003] At present, when a fatigue test is performed on a combined sucker rod, it is often necessary to clamp and fix it to a fatigue testing machine. The clamping device in the current fatigue testing machine is often clamped and fixed by a coupling. Therefore, for combined sucker rods of different models, since the rod diameters of the combined sucker rods are different, couplings of different specifications need to be replaced, which is cumbersome. In addition, when the combined sucker rod is clamped and fixed, if there are impurities such as oil on the combined sucker rod, the clamping effect will be affected, thereby affecting the results of the fatigue test of the sucker rod.

[0004] Therefore, we proposed a combined sucker rod fatigue test clamping device. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to propose a combined sucker rod fatigue test clamping device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A combined sucker rod fatigue test clamping device comprises an annular seat, a side wall of the annular seat is fixedly connected with an annular block, an inner wall of the annular block is provided with an annular cavity, the inner wall of the annular cavity is uniformly penetrated and slidably connected with a plurality of tooth plates, the inner wall of the tooth plate is provided with a rectangular cavity, a sliding plug is sealingly and slidably connected inside the rectangular cavity, buffer grooves are uniformly provided on the inner wall of the annular cavity, each of the inner walls of the buffer grooves is elastically connected with an extension rod through a reset spring, the extension rod is fixedly connected to the side wall of the sliding plug after penetrating the inner wall of the adjacent tooth plate, one end of the tooth plate is fixedly connected with a rubber-plastic clamping plate, a plurality of inner cavities are provided on the inner wall of the rubber-plastic clamping plate, each of the inner cavities is fixedly connected to the inner wall of the rectangular cavity through a first connecting pipe, a balancing cavity is provided on the inner wall of the tooth plate, a balancing plate is sealingly and slidably connected to the inner wall of the balancing cavity, the balancing plate is elastically connected to the inner wall of the balancing cavity through a tension spring, the inner cavity is fixedly connected to the inner wall of the balancing cavity through a second connecting pipe, and an electric field generator is embedded and installed on the inner wall of the tooth plate.

[0008] Preferably, the bottom wall of the rubber-plastic clamping plate is provided with a plurality of empty grooves, the inner wall of each of the empty grooves is fixedly connected with a first conductive block, the inner wall of the empty groove is fixedly connected with a buffer spring, the other end of the buffer spring is fixedly connected with a sliding column, and one end of the sliding column is fixedly connected with a second conductive block.

[0009] Preferably, the inner wall of the annular cavity is slidably connected with an annular rack, the inner wall of the annular cavity is rotatably connected with a plurality of driving gears, the tooth plate is meshingly connected with the driving gear, the driving gear is meshingly connected with the annular rack, and the annular rack and the tooth plate are staggered.

[0010] Preferably, the inner side walls of the circular ring block are evenly fixedly connected to multiple groups of parallel support plates, and the inner side walls of two adjacent support plates are rotatably connected to a rotating rod, one of the side walls of the support plates is rotatably connected to a circular tube, the side wall of the rotating rod is fixedly connected to a first connecting rod, the side wall of the first connecting rod is fixedly connected to a first protrusion, the side wall of the circular tube is fixedly connected to a second connecting rod, and the side wall of the second connecting rod is fixedly connected to a second protrusion.

[0011] Preferably, the side wall of the rotating rod is fixedly connected with a first gear, the side wall of the toothed plate is fixedly connected with a synchronous rack, the first gear and the synchronous rack are meshingly connected, the side wall of the circular tube is fixedly connected with a second gear, the side wall of the circular tube is fixedly connected with a clockwork spring, and the other end of the clockwork spring is fixedly connected to the adjacent side wall of the support plate.

[0012] Preferably, the inner wall of the circular ring block is evenly and fixedly connected with a plurality of sliding plates, each of the sliding plate side walls is slidably connected with a first rack and a second rack, the inner wall of the first rack is provided with a first groove, the inner wall of the first groove is elastically connected with a first sliding rod via a first spring, and the end of the first sliding rod away from the first spring is fixedly connected with a cleaning plate.

[0013] Preferably, the first gear is meshingly connected to the first rack, and the second gear is meshingly connected to the second rack.

[0014] Preferably, a second groove is formed in the inner wall of the second rack, a second spring is fixedly connected to the inner wall of the second groove, a second slide bar is fixedly connected to the other end of the second spring, and a crack detector is fixedly connected to one end of the second slide bar away from the second spring.

[0015] Preferably, a micro motor is fixedly mounted on the inner wall of the annular cavity, and an output end of the micro motor is fixedly connected to a gear shaft portion of one of the driving gears.

[0016] Preferably, the side wall of the circular ring seat is symmetrically fixedly connected with a mounting frame.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. By setting structures such as toothed plates, synchronous racks and cleaning plates, when fatigue testing is performed on the combined sucker rod, the micro motor is turned on to first make the first rack drive the cleaning plate and the side wall of one end of the combined sucker rod to contact each other, and the annular seat is driven to rotate by external traction equipment. Then, the annular seat will drive multiple cleaning plates to move along the circumference of the combined sucker rod through the annular block, thereby cleaning the surface of the combined sucker rod, and preventing impurities such as oil from affecting the detection effect of the subsequent crack detector and the clamping effect of the rubber-plastic clamping plate;

[0019] 2. By arranging the first protrusion, the second protrusion and the crack detector and other structures, after the surface of the combined sucker rod is cleaned, the crack detector is brought into contact with the side of the combined sucker rod, and then the annular seat is driven to rotate by external traction equipment, so that the crack detector performs contact detection along the circumference of the side wall of the combined sucker rod, thereby avoiding inaccurate test results due to quality defects of the combined sucker rod itself during fatigue testing;

[0020] 3. After the above operation is completed, the output end of the micro motor drives the driving gear fixedly connected thereto to rotate counterclockwise. By setting structures such as the annular cavity, the rubber-plastic clamping plate and the driving gear, each tooth plate drives the rubber-plastic clamping plate fixed at one end thereof to contact the side wall of one end of the combined sucker rod. Since the rubber-plastic clamping plate is made of rubber-plastic material and can be deformed, after the rubber-plastic clamping plate and the side wall of one end of the combined sucker rod contact each other, the rubber-plastic clamping plate can be deformed to completely fit the side wall of one end of the combined sucker rod of different models, thereby increasing the scope of application of the clamping device;

[0021] 4. During the outward movement of the tooth plate, the extension rod will also drive the sliding plug to slide in a sealed manner inside the rectangular cavity. By setting up structures such as the inner cavity, the empty slot and multiple conductive blocks, the inner cavity is filled with electrorheological fluid, and the electric field generator is triggered to generate an electric field, so as to fix the rubber-plastic clamping plate after the curvature is changed, so as to facilitate the clamping of the side wall of one end of the combined sucker rod, thereby better completing the fatigue test of the combined sucker rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a combined sucker rod fatigue test clamping device proposed by the present invention;

[0023] Figure 2 for Figure 1 A magnified schematic diagram of the structure of part A;

[0024] Figure 3 for Figure 1 A magnified schematic diagram of the structure of part B;

[0025] Figure 4A schematic diagram of the positional relationship between a tooth plate, a first gear and a first rack in a combined sucker rod fatigue test clamping device proposed by the present invention;

[0026] Figure 5 for Figure 4 A magnified schematic diagram of the structure of part C in the middle;

[0027] Figure 6 A schematic diagram of the positional relationship between a support plate and a slide plate in a combined sucker rod fatigue test clamping device proposed by the present invention;

[0028] Figure 7 A schematic diagram of the structure inside the first rack and the second rack in a combined sucker rod fatigue test clamping device proposed by the present invention;

[0029] Figure 8 The present invention provides a schematic diagram of the appearance of a combined sucker rod fatigue test clamping device.

[0030] In the figure: 1, annular seat; 2, annular block; 3, annular cavity; 4, driving gear; 5, tooth plate; 6, rectangular cavity; 7, sliding plug; 8, buffer groove; 9, reset spring; 10, extension rod; 11, rubber and plastic clamping plate; 12, inner cavity; 13, first connecting pipe; 14, second connecting pipe; 15, balance cavity; 16, tension spring; 17, balance plate; 18, electric field generator; 19, empty slot; 20, buffer spring; 21, sliding column; 22, second conductive block; 23, first conductive block; 24, support plate; 25, synchronous gear 1. a toothed bar; 26. a rotating rod; 27. a first gear; 28. a round tube; 29. ​​a clockwork spring; 30. a second gear; 31. a first connecting rod; 32. a first protrusion; 33. a second connecting rod; 34. a second protrusion; 35. a first rack; 36. a sliding plate; 37. a first slide bar; 38. a cleaning plate; 39. a second rack; 40. a second slide bar; 41. a crack detector; 42. a first groove; 43. a first spring; 44. a second groove; 45. a second spring; 49. a mounting bracket; 50. a ring rack; 51. a micro motor. DETAILED DESCRIPTION

[0031] 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.

[0032] Reference Figure 1 - Figure 8A combined sucker rod fatigue test clamping device comprises a circular ring seat 1, a circular ring block 2 is fixedly connected to the side wall of the circular ring seat 1, a circular ring cavity 3 is opened on the inner wall of the circular ring block 2, a plurality of tooth plates 5 are uniformly penetrated and slidably connected to the inner wall of the circular ring cavity 3, a rectangular cavity 6 is opened on the inner wall of the tooth plate 5, the rectangular cavity 6 is filled with electrorheological fluid, a sliding plug 7 is sealed and slidably connected to the inside of the rectangular cavity 6, a buffer groove 8 is uniformly opened on the inner wall of the circular ring block 2 located on the circular ring cavity 3, a reset spring 9 is fixedly connected to the inner wall of each buffer groove 8, an extension rod 10 is fixedly connected to the other end of the reset spring 9, the extension rod 10 is slidably connected to the corresponding buffer groove 8, the extension rod 10 penetrates the inner wall of the adjacent tooth plate 5 and is fixedly connected to the side wall of the sliding plug 7, and a rubber-plastic clamping plate 11 (such as Figure 8 As shown), the rubber-plastic clamping plate 11 is an arc-shaped structure, and the rubber-plastic clamping plate 11 is made of rubber-plastic material and can produce deformations of different curvatures. A plurality of inner cavities 12 are provided on the inner wall of the rubber-plastic clamping plate 11, and each inner cavity 12 is fixedly connected to the inner wall of the rectangular cavity 6 through a first connecting tube 13. A balancing cavity 15 is provided on the inner wall of the tooth plate 5, and a balancing plate 17 is sealingly and slidably connected to the inner wall of the balancing cavity 15. The balancing plate 17 is elastically connected to the inner wall of the balancing cavity 15 through a tension spring 16. The inner cavity 12 is fixedly connected to the inner wall of the balancing cavity 15 through a second connecting tube 14, and the inner wall of the balancing cavity 15 away from the second connecting tube 14 is connected to the outside world. An electric field generator 18 is embedded and installed on the inner wall of the tooth plate 5. The electric field generator 18 is a prior art and will not be described in detail here.

[0033] A plurality of slots 19 are provided on the bottom wall of the rubber-plastic clamping plate 11, and a first conductive block 23 is fixedly connected to the inner wall of each slot 19, a buffer spring 20 is fixedly connected to the inner wall of the slot 19, a sliding column 21 is fixedly connected to the other end of the buffer spring 20, and a second conductive block 22 is fixedly connected to one end of the sliding column 21. The electric field generator 18 is electrically connected to the first conductive block 23 and the second conductive block 22. When each first conductive block 23 and the corresponding second conductive block 22 are in contact with each other, the circuit composed of the plurality of first conductive blocks 23, the plurality of second conductive blocks 22 and the electric field generator 18 is closed, and the electric field generator 18 is powered on and started.

[0034] An annular rack 50 is slidably connected to the inner wall of the annular cavity 3, and a plurality of driving gears 4 are rotatably connected to the inner wall of the annular cavity 3. The toothed plate 5 is meshed with the driving gear 4, and the driving gear 4 is meshed with the annular rack 50. The annular rack 50 and the toothed plate 5 are staggered.

[0035] The inner side wall of the circular ring block 2 is evenly fixedly connected with a plurality of parallel support plates 24 (combined with Figure 1 and Figure 6 ), the inner side walls of two adjacent support plates 24 are connected to a rotating rod 26 (combined with Figure 5 and Figure 6), a round tube 28 is rotatably connected to the side wall of one of the support plates 24, the round tube 28 is sleeved on the side of the rotating rod 26, the first connecting rod 31 is fixedly connected to the side wall of the rotating rod 26, the first connecting rod 31 is fixedly connected to the side wall with a first protrusion 32, the round tube 28 is fixedly connected to the side wall with a second connecting rod 33, and the second connecting rod 33 is fixedly connected to the side wall with a second protrusion 34.

[0036] A first gear 27 is fixedly connected to the side wall of the rotating rod 26, a synchronous rack 25 is fixedly connected to the side wall of the toothed plate 5, the first gear 27 and the synchronous rack 25 are meshingly connected, a second gear 30 is fixedly connected to the side wall of the circular tube 28, a clockwork spring 29 is fixedly connected to the side wall of the circular tube 28, the other end of the clockwork spring 29 is fixedly connected to the side wall of the adjacent support plate 24, and the clockwork spring 29 can restore the circular tube 28 to its initial state when no external force is applied.

[0037] The inner wall of the ring block 2 is evenly fixedly connected with a plurality of slide plates 36, and the side wall of each slide plate 36 is slidably connected with a first rack 35 and a second rack 39. The inner wall of the first rack 35 is provided with a first groove 42 (such as Figure 7 As shown in the figure, the inner wall of the first groove 42 is elastically connected to the first slide bar 37 through the first spring 43, and the cleaning plate 38 is fixedly connected to one end of the first slide bar 37 away from the first spring 43.

[0038] The first gear 27 is meshedly connected to the first rack 35 , and the second gear 30 is meshedly connected to the second rack 39 .

[0039] A second groove 44 is formed on the inner wall of the second rack 39, a second spring 45 is fixedly connected to the inner wall of the second groove 44, a second slide bar 40 is fixedly connected to the other end of the second spring 45, and a crack detector 41 is fixedly connected to one end of the second slide bar 40 away from the second spring 45. The crack detector 41 is a prior art and can detect the metal material of the combined sucker rod through ultrasonic and other technologies to avoid inaccurate subsequent fatigue tests due to quality defects of the combined sucker rod itself.

[0040] A micro motor 51 is fixedly mounted on the inner wall of the annular cavity 3 , and the output end of the micro motor 51 is fixedly connected to the gear shaft portion of one of the driving gears 4 . A mounting frame 49 is symmetrically fixedly connected to the side wall of the annular seat 1 .

[0041] In the present invention, when the fatigue test of the combined sucker rod is performed, the annular seat 1 is firstly sleeved on the side of one end of the combined sucker rod, and then the micro motor 51 is turned on. The micro motor 51 is a forward and reverse motor. When the output end of the micro motor 51 drives the driving gear 4 fixedly connected to it to rotate forward, the driving gear 4 will drive the annular rack 50 meshing with it to slide to produce a rotation effect, and then the annular rack 50 will drive the other multiple driving gears 4 to rotate synchronously, so that each driving gear 4 drives the toothed plate 5 meshing with it to move a distance away from the center of the annular block 2, and the toothed plate 5 will drive the synchronous rack 25 fixedly connected to its side wall to rotate. The first gear 27 meshing with it rotates, and the first gear 27 drives the first rack 35 meshing with it to move in the opposite direction for a distance, then the first rack 35 will drive the cleaning plate 38 and the side wall of one end of the combined sucker rod to contact, and make them tightly contact under the elastic force of the first spring 43. At this time, the micro motor 51 is turned off, and the annular seat 1 is driven to rotate by external traction equipment, then the annular seat 1 will drive multiple cleaning plates 38 to move circumferentially along the combined sucker rod through the annular block 2, and then clean the surface of the combined sucker rod to prevent impurities such as oil from affecting the detection effect of the subsequent crack detector 41 and the clamping effect of the rubber-plastic clamping plate 11.

[0042] Then, the micro motor 51 is restarted, and the first gear 27 continues to rotate by a certain angle. During the rotation of the first gear 27, the first gear 27 also drives the rotating rod 26 to rotate, and the rotating rod 26 drives the first protrusion 32 to move through the first connecting rod 31, until the rotating rod 26 drives the first connecting rod 31 and the first protrusion 32 to rotate nearly a full circle angle, the first protrusion 32 will come into contact with the second protrusion 34, and the first protrusion 32 will drive the round tube 28 to rotate synchronously through the second protrusion 34 and the second connecting rod 33, and at this time the round tube 28 will drive the round tube 28 fixedly connected to it to rotate synchronously. The second gear 30 rotates a certain angle, so that the second gear 30 drives the second rack 39 meshing with it to move a distance toward the side of the combined sucker rod, so that the second rack 39 drives the crack detector 41 to contact the side of the combined sucker rod through the second spring 45 and the second slide rod 40, and then drives the annular seat 1 to rotate through external traction equipment, so that the crack detector 41 performs contact detection along the circumference of the side wall of the combined sucker rod, thereby avoiding inaccurate fatigue test results due to quality defects of the combined sucker rod itself during fatigue test.

[0043] After the above operation is completed, when the output end of the micro motor 51 drives the driving gear 4 fixedly connected thereto to rotate counterclockwise, the crack detector 41 and the cleaning plate 38 are out of contact with the side of the combined sucker rod, and the driving gear 4 will drive the annular rack 50 meshing with it to slide to produce a rotation effect, then the annular rack 50 will drive the other multiple driving gears 4 to rotate synchronously, so that each driving gear 4 drives the toothed plate 5 meshing with it to move a distance in the direction close to the center of the circular ring block 2, then the toothed plate 5 will drive the rubber-plastic clamping plate 11 fixed at one end thereof to contact the side wall of one end of the combined sucker rod, because the rubber-plastic clamping plate 11 is made of rubber-plastic material and can be deformed, then after the rubber-plastic clamping plate 11 and the side wall of one end of the combined sucker rod are in contact, the rubber-plastic clamping plate 11 can be deformed to completely fit the side wall of one end of the combined sucker rod of different models, thereby increasing the scope of application of the clamping device.

[0044] During the outward movement of the tooth plate 5, the extension rod 10 will also drive the sliding plug 7 to slide in a sealed manner inside the rectangular cavity 6, thereby squeezing the electrorheological fluid inside the rectangular cavity 6 into the multiple inner cavities 12 through the first connecting tube 13, so that the inner cavity 12 is filled with electrorheological fluid, and the excess electrorheological fluid in the inner cavity 12 will enter the balance cavity 15 through the second connecting tube 14 and push the balance plate 17 to squeeze the tension spring 16. When the rubber-plastic clamping plate 11 and the side wall of the combined sucker rod are completely fitted and clamped, the multiple sliding columns 21 arranged on the side wall of the rubber-plastic clamping plate 11 will be pressed against the side wall of the combined sucker rod to slide into the empty groove 19, and then the second guide fixedly connected at one end of each sliding column 21 The electric block 22 will come into contact with the corresponding first conductive block 23, thereby causing the electric field generator 18 to be powered on and generate an electric field. The electrorheological fluid inside the inner cavity 12 is a suspension under normal conditions, consisting of solid particles with a high dielectric constant uniformly dispersed in insulating oil with a low dielectric constant. When the external electric field strength is lower than a certain critical value, the electrorheological fluid is in liquid form; when the electric field strength is higher than this critical value, it will become solid. Then, under the action of the electric field of the electric field generator 18, the electrorheological fluid becomes solid, and the rubber-plastic clamping plate 11 with the changed curvature is fixed, which is convenient for clamping the side wall of one end of the combined sucker rod, thereby better completing the fatigue test of the combined sucker rod.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A combined sucker rod fatigue test clamping device, comprising a circular ring seat (1), characterized in that: The side wall of the annular seat (1) is fixedly connected to an annular block (2), the inner wall of the annular block (2) is provided with an annular cavity (3), the inner wall of the annular cavity (3) is uniformly penetrated by a plurality of tooth plates (5) in sliding connection, the inner wall of the tooth plates (5) is provided with a rectangular cavity (6), the interior of the rectangular cavity (6) is filled with electrorheological fluid, the interior of the rectangular cavity (6) is sealingly and slidingly connected to a sliding plug (7), the inner wall of the annular cavity (3) is uniformly provided with buffer grooves (8), the inner wall of each buffer groove (8) is elastically connected to an extension rod (10) via a reset spring (9), the extension rod (10) penetrates the inner wall of the adjacent tooth plate (5) and is fixedly connected to the side wall of the sliding plug (7), One end of the tooth plate (5) is fixedly connected to a rubber-plastic clamping plate (11), and the inner wall of the rubber-plastic clamping plate (11) is provided with a plurality of inner cavities (12), each of the inner cavities (12) is fixedly connected to the inner wall of the rectangular cavity (6) via a first connecting tube (13), a balancing cavity (15) is provided on the inner wall of the tooth plate (5), and a balancing plate (17) is sealingly and slidably connected to the inner wall of the balancing cavity (15), and the balancing plate (17) is elastically connected to the inner wall of the balancing cavity (15) via a tension spring (16), and the inner cavity (12) is fixedly connected to the inner wall of the balancing cavity (15) via a second connecting tube (14), and an electric field generator (18) is embedded and installed on the inner wall of the tooth plate (5); The inner side wall of the circular ring block (2) is evenly and fixedly connected to a plurality of groups of support plates (24) arranged in parallel, the inner side walls of two adjacent support plates (24) are rotatably connected to a rotating rod (26), the side wall of one of the support plates (24) is rotatably connected to a circular tube (28), the side wall of the rotating rod (26) is fixedly connected to a first connecting rod (31), the side wall of the first connecting rod (31) is fixedly connected to a first protrusion (32), the side wall of the circular tube (28) is fixedly connected to a second connecting rod (33), and the side wall of the second connecting rod (33) is fixedly connected to a second protrusion (34); The side wall of the rotating rod (26) is fixedly connected to a first gear (27), the side wall of the toothed plate (5) is fixedly connected to a synchronous rack (25), the first gear (27) and the synchronous rack (25) are meshingly connected, the side wall of the circular tube (28) is fixedly connected to a second gear (30), the side wall of the circular tube (28) is fixedly connected to a spring (29), and the other end of the spring (29) is fixedly connected to the side wall of an adjacent support plate (24); The inner wall of the annular block (2) is evenly and fixedly connected with a plurality of slide plates (36); the side wall of each slide plate (36) is slidably connected with a first rack (35) and a second rack (39); the inner wall of the first rack (35) is provided with a first groove (42); the inner wall of the first groove (42) is elastically connected with a first slide bar (37) via a first spring (43); and the end of the first slide bar (37) away from the first spring (43) is fixedly connected with a cleaning plate (38); The first gear (27) is meshedly connected to the first rack (35), and the second gear (30) is meshedly connected to the second rack (39); A second groove (44) is formed on the inner wall of the second rack (39); a second spring (45) is fixedly connected to the inner wall of the second groove (44); the other end of the second spring (45) is fixedly connected to a second slide bar (40); and one end of the second slide bar (40) away from the second spring (45) is fixedly connected to a crack detector (41).

2. The combined sucker rod fatigue test clamping device according to claim 1, characterized in that: The bottom wall of the rubber-plastic clamping plate (11) is provided with a plurality of empty slots (19), the inner wall of each of the empty slots (19) is fixedly connected to a first conductive block (23), the inner wall of the empty slot (19) is fixedly connected to a buffer spring (20), the other end of the buffer spring (20) is fixedly connected to a sliding column (21), and one end of the sliding column (21) is fixedly connected to a second conductive block (22).

3. The combined sucker rod fatigue test clamping device according to claim 1, characterized in that: The inner wall of the annular cavity (3) is slidably connected to an annular rack (50), the inner wall of the annular cavity (3) is rotatably connected to a plurality of driving gears (4), the toothed plate (5) and the driving gears (4) are meshingly connected, the driving gears (4) and the annular rack (50) are meshingly connected, and the annular rack (50) and the toothed plate (5) are staggered.

4. The combined sucker rod fatigue test clamping device according to claim 3, characterized in that: A micro motor (51) is fixedly mounted on the inner wall of the annular cavity (3), and an output end of the micro motor (51) is fixedly connected to a gear shaft portion of one of the driving gears (4).

5. The combined sucker rod fatigue test clamping device according to claim 2, characterized in that: The side wall of the annular seat (1) is symmetrically fixedly connected with a mounting frame (49), and the electric field generator (18) is electrically connected to the first conductive block (23) and the second conductive block (22).

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