CN112857777A - Fatigue performance experiment platform for polished pumping rod under stretching and bending superposition deformation working conditions - Google Patents
Fatigue performance experiment platform for polished pumping rod under stretching and bending superposition deformation working conditions Download PDFInfo
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Abstract
The invention discloses a fatigue performance experiment platform of a polished sucker rod under the working condition of stretching and bending superimposed deformation, which comprises a main body frame, a loading system, a measuring system and a control system, wherein the loading system further comprises a lateral extrusion device, a plurality of groups of camera units are arranged on the main body frame opposite to the lateral extrusion device, an extrusion arc plate is arranged at the end part of the lateral extrusion device, the outer surface of the extrusion arc plate is attached to the outer circular surface of a polished sucker rod sample, and the extrusion arc plate can automatically adjust the contact position with the outer surface of the polished sucker rod sample. The fatigue performance test platform of the polished pumping rod under the working condition of stretching and bending superposition deformation can well simulate the fatigue performance of the polished pumping rod under the actual stretching and bending superposition deformation under the experimental conditions and the strictly controllable and adjustable experimental process, and provides a reliable test platform for selection, service life prediction and well site management of the polished pumping rod.
Description
Technical Field
The invention relates to a fatigue performance test device for a polished pumping rod, in particular to a fatigue performance test platform for a polished pumping rod under the working conditions of stretching and bending superposition deformation.
Background
As the main oil extraction mode at home and abroad at present, the oil pumping polished rod which is a key part for artificial lift oil extraction faces increasingly complex service environments. For the oil pumping polished rod, due to the problems of deep wells, ultra-deep wells and inclined wells, undesirable well mouth centering and the like, the oil pumping polished rod needs to bear axial tension-tension alternating load and bending alternating load simultaneously in the service process, the failure stress of the oil pumping polished rod is mainly tensile stress, particularly the side of the polished rod with the convex and bent surface bears more severe superimposed tensile stress, and the oil pumping polished rod is the priority position for fatigue failure.
However, in the aspect of the fatigue performance detection and evaluation equipment of the polished pumping rod, the problems existing at present are serious: the standard fatigue testing machine is mainly used in a laboratory environment, the standard fatigue testing machine generally comprises a main body frame, a loading system, a measuring system and a control system, the loading system can be used for loading a material sample under different cyclic load conditions, the measuring system can be used for obtaining the load, displacement and other variables born by the material sample in real time, the control system can be used for realizing the accurate operation of the whole fatigue testing machine under the set conditions, thereby obtaining fatigue performance indexes such as fatigue life, fatigue limit and the like of the oil pumping polished rod under different conditions, but there are still simpler situations in the fatigue performance detection of the sucker rod, such as single evaluation of the axial pull-pull fatigue performance of the sucker rod, or singly evaluating the rotary bending fatigue performance of the steel, or comprehensively carrying out certain theoretical analysis and calculation on the results obtained by the two; in the field experiment aspect, the fatigue performance of the sucker rod is evaluated mainly by carrying out later analysis statistics and induction on the failed sucker rod sample, and a small amount of field experiments can be carried out in a small number of cases. The difference between the data obtained by the existing standard fatigue testing machine and the fatigue of the actual pumping polished rod under the condition of pull-bend superposition deformation is large, so that the actual requirements are difficult to meet by the very limited field experiments or the statistical analysis of the actual failure samples, no matter the quantity or the control of the working conditions. Therefore, the fatigue performance test of the polished pumping rod under the working conditions of stretching and bending superposition deformation has larger difference with the actual working conditions of the polished pumping rod.
Therefore, an experimental platform for testing the fatigue performance of the polished pumping rod based on the tensile and bending superposition deformation working conditions of the polished pumping rod under the condition that the experimental conditions can be strictly controlled and adjusted is to be developed so as to effectively monitor and test the fatigue performance of the polished pumping rod under different materials and process conditions.
Disclosure of Invention
The invention aims to provide a fatigue performance test platform of a sucker rod under the working conditions of stretching and bending superposition deformation, which well simulates the fatigue performance of the actual stretching and bending superposition deformation of the sucker rod under the conditions of strict, controllable and adjustable test conditions and test processes, and provides a reliable test platform for the selection, service life prediction and well site management of the sucker rod.
According to the fatigue performance test platform of the polished pumping rod under the working condition of stretching and bending superposition deformation, the invention adopts the main technical scheme that:
comprises a main body frame, a loading system, a measuring system and a control system, wherein the upper part of the main body frame is provided with a movable beam, the lower part of the main body frame is provided with a fixed beam, an upper clamping assembly connected with the polished pumping rod sample is fixedly arranged below the movable cross beam, the loading system also comprises a lateral extrusion device, the lateral extrusion device which can move up and down in the vertical direction is arranged on the side surface of the main body frame, a plurality of groups of camera units are arranged on the main body frame opposite to the lateral extrusion device, a first servo loading mechanism is arranged between the movable cross beam and the upper clamping component of the polished pumping rod sample, the lateral extrusion device is internally provided with a second servo loading mechanism, the end part of the lateral extrusion device is provided with an extrusion arc plate, the outer surface of the extrusion arc plate is attached to the outer circular surface of the polished pumping rod sample, and the contact position of the extrusion arc plate and the outer surface of the polished pumping rod can be automatically adjusted. The lateral extrusion device can move up and down in the vertical direction, so that the bent part of the polished pumping rod can be adjusted as required; the first servo loading mechanism and the second servo loading mechanism can realize the application of corresponding alternating stress on the polished pumping rod test sample according to set conditions.
The invention also adopts the following subsidiary technical proposal:
preferably, the extrusion arc plate is a half cylinder which is vertically placed and can rotate around an axis, a concave semicircular groove is formed in the outer surface of the cylinder, the outer surface of the cylinder is in contact with the surface of the polished pumping rod, a supporting body is arranged between the middle of the back of the cylinder and the end part of the lateral extrusion device, and the middle of the back of the cylinder is connected with the supporting body through a first rotating shaft.
Preferably, the extrusion arc plate is an arc groove with an outward convex outer surface, and the arc groove is a single continuous body or is composed of a plurality of arc groove blocks.
The continuous body is characterized in that a main supporting rod is arranged between the middle of the back face of the continuous body and the end part of the lateral extrusion device, an auxiliary supporting rod is arranged between the edge of the back face of the circular arc groove of the continuous body and the end part of the lateral extrusion device, the main supporting rod is fixedly connected with the end part of the lateral extrusion device, a second rotating shaft is arranged between the main supporting rod and the middle of the back face of the continuous body, the continuous body freely rotates around the second rotating shaft in a plane formed by the axis of the oil pumping polished rod and the perpendicular line of the second rotating shaft, and an elastic body is arranged in the middle section of the auxiliary.
The supporting column is arranged between the middle of the back face of any one of the arc groove blocks and the end of the lateral extrusion device, the supporting column is fixedly connected with the end of the lateral extrusion device, a third rotating shaft is arranged between the supporting column and the middle of the back face of the arc groove block, and the arc groove block rotates freely around the third rotating shaft in a plane formed by the axis of the polished pumping rod and the perpendicular line of the third rotating shaft.
The clamp of the upper clamping assembly at least comprises two parts, wherein any part of the clamp is divided into a clamping section and a protecting section from top to bottom, when viewed from the direction parallel to the axis of the polished pumping rod sample, the teeth of the clamping section adopt sharp teeth threads with inverted V-shaped cross sections, the cross section of the teeth of the protecting section is in an outer convex arc shape or a rectangular shape, and the tooth density of the clamping section is greater than that of the protecting section in the unit length direction of the axis.
The middle part of the oil pumping polished rod sample is a rod body, the rod body is a slender straight rod, the length-diameter ratio of the rod body is not lower than 50, clamping ends are arranged at two ends of the oil pumping polished rod sample, the length of each clamping end and the diameter ratio of the rod body are not lower than 5, the diameter ratio of each clamping end to the rod body is not lower than 1.5:1, smooth arc transition processing is carried out at the joint of each clamping end and the rod body, and the bottom end of a clamp of the upper clamping assembly exceeds the clamping end of the oil pumping polished rod sample when the sample is clamped and fixed.
And a lower clamping assembly connected with the polished pumping rod sample is fixedly arranged above the fixed cross beam.
Preferably, in another scheme, a counterweight assembly connected with the polished pumping rod sample is arranged above the fixed cross beam, the counterweight assembly is in non-fixed connection with the fixed cross beam, and the counterweight assembly can swing in a horizontal plane parallel to the fixed cross beam.
And a load adjusting device is arranged on the side surface of the counterweight component and used for dynamically adjusting the weight and the position of the counterweight component.
Compared with the prior art, the fatigue performance test platform of the polished pumping rod under the working condition of stretching and bending superposition deformation has the following beneficial effects:
firstly, the technical scheme of the invention is based on the mature functional structure of the existing fatigue testing machine, ensures the controllability and adjustability of the testing conditions and the reliability of the result, simultaneously realizes the fatigue test of the polished pumping rod under the condition of stretching and bending superposition deformation in a laboratory environment, and considers the actual working condition of the polished pumping rod and the parameter controllability of the standard fatigue testing machine.
Secondly, the technical scheme of the invention can well realize the fatigue test of the polished pumping rod under the working conditions of actual stretching and bending superposition deformation by introducing the lateral extrusion device and specially designing the structure of the lateral extrusion device. The lateral extrusion device is internally provided with a second servo loading mechanism, so that the dynamic adjustment of parameters such as the circulation ratio and the like of the bending load can be realized as required; particularly, in the technical scheme of the invention, the end part of the lateral extrusion device is provided with at least one independently working extrusion arc plate capable of automatically adjusting the contact position of the outer surface, and in the preferred scheme, the special structural design of a semi-cylinder or a continuum is adopted, so that the contact position of the outer surface of the arc plate can be adaptively and automatically adjusted according to the bending deformation degree and the profile of the sucker rod body, and the contact joint and the effective support with the largest area as possible are realized between the extrusion arc plate and the sucker rod body. Furthermore, the effect of the design scheme of the arc groove block body is better, and the integral effect of extruding the arc surface of the arc plate can be realized through the combination of the plurality of arc groove block bodies; and through the separation design of each circular arc groove block, can be used for different contact position departments to utilize the self-adjustment of single circular arc groove block position again, realize contact and laminating between the at utmost and the complete body of rod to utilize the design of same group circular arc groove block just can satisfy the deformation curve of the body of rod under the different conditions, realize more excellent laminating and supporting effect.
Thirdly, the technical scheme of the invention adopts two technical schemes of a fixed end and a free end at the lower clamping section of the polished pumping rod, so that the practical working condition of the polished pumping rod can be better simulated. The lower clamping end is designed by adopting a fixed end of a lower clamping assembly fixedly connected with the fixed cross beam, so that the experimental conditions can be more strictly controlled from the perspective of a standard fatigue testing machine; and the lower clamping end adopts the free end design of the counterweight component movably connected with the fixed cross beam, so that the counterweight component can swing in a certain range in a horizontal plane parallel to the fixed cross beam, and the bending deformation of the polished pumping rod body can be adjusted through the change of the bottom position. The two schemes have trends and can be combined with each other to simulate the actual service working condition of the oil pumping polished rod more comprehensively according to actual conditions.
Fourthly, in the technical scheme of the invention, the sample of the polished pumping rod is specially designed. The design of the length and diameter proportion of the oil pumping polished rod enables the rod body to be a slender rod, the rod body is easy to bend under the action of radial external force, and meanwhile, too large stress concentration cannot be generated on the clamping ends at two ends, so that smooth experiment is ensured.
Fifthly, in the technical scheme of the invention, the clamp is specially designed, so that the influence of preferential fatigue damage possibly brought to the clamping end of the polished pumping rod by bending deformation is avoided. Through the appearance and the density distribution design to the anchor clamps tooth, divide anchor clamps into card section of stinging and protection section, when guaranteeing effective centre gripping sucker rod exposed core, effectively alleviate the influence of the stress concentration that bending deformation leads to the exposed core. Under the condition of tensile and bending superposition deformation, the stress on the part of the clamping end of the sucker rod sample close to the rod body is more complex, the V-shaped sharp tooth threads can generate higher stress concentration on the surface of the clamping end, the clamping mark position is easy to become a fatigue source, and once the clamping end is subjected to fatigue fracture, the service life condition of the rod body part cannot be normally inspected, so that the experiment cannot be normally carried out, therefore, convex arc-shaped or rectangular teeth are adopted to replace the protective section, the tooth density of the protective section is reduced, and the probability of local cracks is effectively reduced by the clamping.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the experimental platform of the present invention.
Fig. 2 is a schematic view of the structure of the outer surface of the extrusion arc plate of the invention which is a cylinder.
Fig. 3 is a front view of the extrusion arc plate of the present invention as a cylinder.
Fig. 4 is a schematic view of the connection structure of the extrusion arc plate of the present invention as a cylinder.
FIG. 5 is a schematic view of the connection structure of the extrusion arc plate of the present invention as a continuous body.
Fig. 6 is a schematic view of the connection structure of the extrusion arc plate of the invention as a circular arc groove block.
Fig. 7 is a schematic diagram showing the position structure of the clamp and the sample holding end of the polished sucker rod according to the present invention.
FIG. 8 is a schematic view of one configuration of the teeth of the inner surface of the clamp of the present invention.
FIG. 9 is another structural schematic of the teeth of the inner surface of the clamp of the present invention.
Fig. 10 is a schematic view of the connection structure of the weight assembly of the present invention.
FIG. 11 is a schematic view showing the contact state of the pressing arc plate of the present invention with the polished sucker rod specimen.
Detailed Description
Referring to fig. 1, the platform for testing fatigue performance of a polished sucker rod under the working condition of stretching and bending superimposed deformation according to the present invention comprises a main frame 1, a loading system, a measuring system and a control system, wherein a movable beam 11 is arranged at the upper part of the main frame 1, a fixed beam 12 is arranged at the lower part of the main frame 1, an upper clamping assembly 111 connected with a polished sucker rod sample 2 is fixedly arranged below the movable beam 11, the loading system further comprises a lateral extrusion device 3, the lateral extrusion device 3 capable of moving up and down in the vertical direction is arranged on the side surface of the main frame 1, a plurality of groups of camera units 4 are arranged on the frame opposite to the lateral extrusion device 3, a first servo loading mechanism is arranged between the movable beam 11 and the upper clamping assembly 111 of the polished sucker rod sample 2, and a second servo loading mechanism is arranged in the lateral extrusion device 3, the end part 31 of the lateral extrusion device 3 is provided with an extrusion arc plate 32, the outer surface of the extrusion arc plate 32 is attached to the outer circular surface of the polished pumping rod sample 2, and the contact position of the extrusion arc plate 32 and the outer surface of the polished pumping rod sample 2 can be automatically adjusted. The design of the lateral extrusion device 3 is a key part for realizing the bending deformation of the polished sucker rod sample, and the design of the extrusion arc plate can automatically adjust the contact position of the outer surface, so that the bending part of the polished sucker rod is not acted by concentrated force, and the contact position of the outer surface can be adaptively and automatically adjusted according to the bending deformation degree and the profile of the polished sucker rod body, so that the bending part of the polished sucker rod body is more tightly attached to the outer surface of the extrusion arc plate, the supporting length is longer, the bending deformation is smoother and more coordinated, and the bending deformation working condition of the polished sucker rod is better met.
Referring to fig. 2 to 4, as a preferred scheme, the pressing arc plate 32 is a half cylinder 321 transversely placed and rotatable around an axis, the outer surface of the cylinder 321 contacting the surface of the sucker rod has a recessed semicircular groove 3210, a support body 3211 is arranged between the middle of the back surface of the cylinder 321 and the end 31 of the lateral pressing device 3, the middle of the back surface of the cylinder 321 is connected with the support body 3211 through a first rotating shaft 3212, and the first rotating shaft 3212 penetrates through the cross section of the support body 3211 and the cylinder 321. The design of the semi-circular groove 3210 enables the rod body at the bent part of the polished pumping rod to be sunk into the semi-circular groove, so that large-area fit between the contact surfaces of the rod body and the polished pumping rod is realized, the loading process of load is stabilized, and the local stress of the rod body is reduced; the cylinder 321 can rotate around its axis through the first rotating shaft 3212, so that the contact position with the outer surface of the rod body can be adjusted automatically, and the maximum effective support can be realized.
Referring to fig. 5 and 6, as another preferable scheme, the pressing arc plate 32 is an arc groove with an outwardly convex outer surface, and the arc groove is formed by a continuous body 322 or a multi-segment arc groove block 323. The back is the design of plane in order to realize the easy installation of axis of rotation, and then realizes that the extrusion arc board is to the self adjustment of contact position. The back of the extrusion arc plate 32 can be selected to be a plane, and the design that the back is a non-plane can also be selected according to the actual situation.
Referring to fig. 5, a main supporting rod 3221 is disposed between a middle portion of the back surface of the continuous body 322 and the end portion 31 of the lateral pressing device 3, an auxiliary supporting rod 3222 is disposed between an edge of the back surface of the circular arc groove of the continuous body 322 and the end portion 31 of the lateral pressing device 3, the main supporting rod 3221 is fixedly connected to the end portion 31 of the lateral pressing device 3, a second rotating shaft 3223 is disposed between the main supporting rod 3221 and the middle portion of the back surface of the continuous body, the circular arc groove of the continuous body 322 freely rotates around the second rotating shaft 3223 in a plane which contains the axis of the polish rod 2 and is perpendicular to the second rotating shaft, and an elastic body 3224 is disposed in the middle portion of the auxiliary supporting rod 3222. The main supporting rod 3221 can also realize the adjustment of the position of the arc groove of the continuous body through the second rotating shaft 3223 in addition to the transmission of the load, and the auxiliary supporting rod 3222 can also realize the adjustment of the length of the auxiliary supporting rod through the elastic body 3224 while transmitting the load, so as to realize the self-adjustment of the contact position by the pressing arc plate in cooperation with the main supporting rod 3221. The number of the main supporting rods and the auxiliary supporting rods can be increased according to needs.
Referring to fig. 6, a support column 3231 is disposed between a middle portion of a back surface of any one of the arc groove blocks 323 and an end portion of the lateral extrusion device 3, the support column 3231 is fixedly connected to the end portion 31 of the lateral extrusion device 3, a third rotation shaft 3232 is disposed between the support column 3231 and a middle portion of a back surface of the arc groove block 323, and the arc groove block 323 freely rotates around the third rotation shaft 3232 in a plane that includes an axis of the polish rod 2 and is perpendicular to the third rotation shaft. The design of arc groove block 323 is the improvement to the continuum scheme, the arc surface effect of continuum extrusion arc board can be realized to the combination through a plurality of arc groove blocks, and through the separate design of each arc groove block, make the arc surface effect of extrusion arc board more superior to the continuum again, specially adapted body of rod is when bending deformation under different loads, same group of arc groove block design can be applicable to different body of rod deformation curves, thereby it is bigger to obtain contact length, the better extrusion arc board of laminating, and then realize better support.
Referring to fig. 7 to 9, the clamp 112 of the upper clamping assembly 111 includes at least two parts, where any part of the clamp 112 is divided into a clamping section 1121 and a protection section 1122 from top to bottom, when viewed in a direction parallel to an axis of the polished pumping rod sample, teeth of the clamping section 1121 are formed by a thread with a cross section of an inverted V-shaped sharp tooth, teeth of the protection section 1122 are formed by a thread with a cross section of an outer convex arc shape or a rectangular shape, and a tooth density of the clamping section 1121 is greater than a tooth density of the protection section 1122 in a unit length direction of the axis. The design is that under the condition of stretching and bending superposition deformation, the stress on the part of the clamping end of the sucker rod sample, which is close to the rod body, is more complex, the V-shaped sharp tooth threads can generate higher stress concentration on the surface of the clamping end, the clamping mark position is easy to become a fatigue source, and once the clamping end is subjected to fatigue fracture, the service life condition of the rod body part cannot be normally inspected, so that the experiment cannot be normally performed.
The middle part of the polished pumping rod sample 2 is a rod body 21, the rod body 21 is a slender straight rod, the length-diameter ratio of the rod body 21 is not lower than 50, clamping ends 22 are arranged at two ends of the polished pumping rod sample 2, the length of each clamping end 22 and the diameter ratio of the rod body 21 are not lower than 5, the diameter ratio of each clamping end 22 and the diameter ratio of the rod body 21 is not lower than 1.5:1, smooth arc transition processing is carried out at the joint of each clamping end 22 and the rod body 21, and the bottom end of a clamp 112 of an upper clamping assembly 111 exceeds the clamping end 22 of the polished pumping rod sample 2 during clamping and fixing. The length and diameter ratio of the sucker rod body is designed to enable the rod body to be a slender rod, and the slender rod is easy to bend under the action of radial external force and cannot generate too large stress concentration on the clamping ends at two ends. On the other hand, if the end of the clamp 112 is shorter than the clamping end 22, the contact end surface between the sample clamping end and the clamp end will be broken too early due to stress concentration caused by bending deformation, which will affect the smooth progress of the experiment, and the end of the clamp 112 is beyond the clamping end 22 of the polished sucker rod sample 2, which ensures the smooth progress of the experiment.
Referring to fig. 1, a lower clamping assembly 113 connected with the polished pumping rod sample 2 is fixedly mounted above the fixed beam 12.
Referring to fig. 10, as a preferred scheme, a counterweight assembly 121 connected with the polished sucker rod sample 2 is arranged above the fixed cross beam 12, the counterweight assembly 121 is movably or indirectly connected with the fixed cross beam 12, and the counterweight assembly 121 can swing left and right in a direction perpendicular to the axis of the polished sucker rod sample 2.
The side of the weight assembly 121 is provided with a load adjusting device 122, and the load adjusting device 122 is used for dynamically adjusting the weight and the position of the weight assembly 121. According to the preferable technical scheme of the balance weight component below the oil pumping polished rod, the load of the balance weight component can be adjusted through the load adjusting device 122, and meanwhile, the balance weight component can swing left and right in the direction perpendicular to the axis of the oil pumping polished rod sample 2, so that the bending deformation of the rod body of the oil pumping polished rod can be adjusted, and the actual service working condition of the oil pumping polished rod is further simulated according to actual conditions.
In the actual service process of the oil pumping polished rod, the bending deformation of the oil pumping polished rod is caused by the fact that a horsehead and a wellhead of the oil pumping machine are not moderate, but is not caused by the fact that an external force is concentrated when the horsehead and the wellhead of the oil pumping machine directly act on the bending position of the rod body, therefore, in the fatigue test process of the oil pumping polished rod, the local influence of lateral extrusion load on the rod body is reduced to the greatest extent, for example, the plastic deformation such as obvious indentation and the like is generated on the pressed contact position of the surface of the rod body, or the large stress concentration is caused by the too small contact area, the stress concentration is inconsistent with the actual condition. Therefore, in the technical solution of the present invention, the contact and the attachment with the largest area as possible are adopted between the extrusion arc plate and the rod body, taking the bending deformation condition shown in fig. 11 as an example, the edges of the extrusion arc plate 32 are all solid lines, and the edge line of the left side portion of the rod body 21 of the polished sucker rod sample 2 is a dotted line, which represents that the two form a partial shielding relationship. In the experimental process, the contact surfaces of the extrusion arc plate 32 of the lateral extrusion device 3 and the rod body 21 of the polished sucker rod sample 2 are mutually attached and contacted, at the contact position, a small section of the left side of the rod body 21 of the polished sucker rod sample 2 is sunk into the arc groove of the extrusion arc plate 32, so that the partial arc groove of the extrusion arc plate 32 is attached and grabbed to the local part of the rod body 21, and the shielding effect in fig. 11 appears. Therefore, the contact of the arc groove surface and the outer circular surface of the oil pumping polished rod in a large area can be utilized, so that the stress of the oil pumping polished rod cannot be locally too concentrated, the obvious plastic deformation cannot occur in the stress process of the rod body of the oil pumping polished rod, the large contact length of the arc plate 32 and the rod body 21 is extruded, the rod body of a bending section can be effectively supported in a large range, the local bending of the actual oil pumping polished rod caused by the stress at the far positions of the two ends can be better simulated, and the actual bending deformation working condition of the oil pumping polished rod can be better simulated.
The use process of the experimental platform comprises the following main steps: (1) fixing the sample: the sample of the polished pumping rod is fixed by using the clamp of the upper clamping assembly, the bottom end of the clamp of the upper clamping assembly exceeds the clamping end of the sample of the polished pumping rod when the sample is clamped and fixed, and the lower clamping assembly is determined to be fixedly connected with the fixed cross beam or movably connected with the fixed cross beam by using the counterweight assembly according to the actual service condition; (2) selection of lateral extrusion device: according to the conditions of actual service load, deformation degree and the like, the extrusion arc plate is selected to be a semi-cylinder or a continuum or an arc groove block in advance; (3) loading of the load: designing and loading an axial load and a lateral extrusion device load according to the simulation condition of the polished pumping rod based on a loading system and a control system of a standard fatigue testing machine; (4) the experiment was carried out: in the process of applying load, a measuring system and a plurality of groups of camera units are adopted to observe the shape of the curved convex surface of the sucker rod in the experimental process, and the fatigue cycle times under different stress strain conditions are measured and recorded.
It should be noted that the main frame, the loading system, the measuring system and the control system in the technical scheme of the invention are all based on the mature functional structure of the existing standard fatigue testing machine, thereby ensuring the controllability and adjustability of the testing conditions and the reliability of the result. The servo motor, the actuator, the sensor and other parts are all necessary parts for meeting the operation of the standard material fatigue testing machine, the specific model selection, the corresponding composition structure and the accessories of the parts, and the connection and the control among the parts are all conventional settings in the technical field, and are not specially mentioned and explained one by one in the technical scheme of the invention.
Claims (10)
1. The platform for testing the fatigue performance of the polished sucker rod under the working conditions of stretching and bending superimposed deformation comprises a main body frame, a loading system, a measuring system and a control system, wherein a movable cross beam is arranged at the upper part of the main body frame, a fixed cross beam is arranged at the lower part of the main body frame, the platform is characterized in that an upper clamping assembly connected with a polished sucker rod sample is arranged below the movable cross beam, the loading system further comprises a lateral extrusion device, the lateral extrusion device capable of moving up and down in the vertical direction is arranged on the side surface of the main body frame, a plurality of groups of camera units are arranged on the main body frame opposite to the lateral extrusion device, a first servo loading mechanism is arranged between the movable cross beam and the upper clamping assembly of the polished sucker rod sample, a second servo loading mechanism is arranged in the lateral extrusion device, and an extrusion arc plate is arranged at the, the outer surface of the extrusion arc plate is attached to the outer circular surface of the polished pumping rod sample, and the contact position of the extrusion arc plate and the outer surface of the polished pumping rod sample can be automatically adjusted.
2. The platform for testing the fatigue performance of the polished sucker rod under the condition of stretching and bending superimposed deformation as claimed in claim 1, wherein the extrusion arc plate is a vertically placed and rotatable half cylinder, the outer surface of the cylinder is provided with a recessed semicircular groove, a support body is arranged between the middle part of the back surface of the cylinder and the end part of the lateral extrusion device, and the middle part of the back surface of the cylinder is connected with the support body through a first rotating shaft.
3. The experimental platform for testing the fatigue performance of the polished pumping rod under the working condition of stretching and bending superposition deformation according to claim 1, wherein the extrusion arc plate is an arc groove with an outward convex outer surface, and the arc groove is a continuous body or consists of a plurality of segments of arc groove blocks.
4. The platform for testing fatigue performance of a polished sucker rod under the working condition of stretching and bending superimposed deformation as claimed in claim 3, wherein a main support rod is arranged between the middle of the back surface of the continuum and the end of the lateral extrusion device, an auxiliary support rod is arranged between the edge of the back surface of the continuum and the end of the lateral extrusion device, the main support rod is fixedly connected with the end of the lateral extrusion device, a second rotating shaft is arranged between the main support rod and the middle of the back surface of the circular arc groove, and the auxiliary support rod is provided with an elastic body.
5. The platform for testing the fatigue performance of the polished sucker rod under the working conditions of stretching and bending superposition deformation according to claim 3, wherein a support column is arranged between the middle part of the back surface of any one of the arc groove blocks and the end part of the lateral extrusion device, the support column is fixedly connected with the end part of the lateral extrusion device, and a third rotating shaft is arranged between the support column and the middle part of the back surface of the arc groove block.
6. The platform for testing the fatigue performance of the polished sucker rod under the condition of tensile and bending superimposed deformation according to claim 1, wherein the clamp of the upper clamping assembly comprises at least two parts, the two parts of the clamp are divided into a clamping section and a protecting section from top to bottom, the cross section of the teeth of the protecting section is in the shape of an outward convex circular arc or a rectangle, and the tooth density of the clamping section in the unit length direction of the axis is greater than that of the protecting section.
7. The platform for testing fatigue of the polished sucker rod under the working conditions of stretching and bending superimposed deformation as claimed in claim 1, wherein the middle of the polished sucker rod sample is a rod body, the rod body is an elongated straight rod, the length-diameter ratio of the rod body is not less than 50, the two ends of the polished sucker rod sample are provided with clamping ends, the length of each clamping end and the diameter ratio of the rod body are not less than 5, the diameter ratio of each clamping end and the rod body is not less than 1.5:1, the joint of each clamping end and the rod body is subjected to smooth arc transition treatment, and the bottom end of the clamp of the upper clamping assembly exceeds the clamping end of the polished sucker rod sample when the polished sucker rod sample is clamped and fixed.
8. The experimental platform for testing the fatigue performance of the polished sucker rod under the working condition of stretching and bending superposition deformation according to claim 1, wherein a lower clamping assembly connected with the polished sucker rod sample is fixedly arranged above the fixed cross beam.
9. The platform for testing fatigue of polished sucker rod under the working condition of stretching and bending superimposed deformation according to claim 1, wherein a counterweight assembly connected with the polished sucker rod sample is arranged above the fixed cross beam, the counterweight assembly is in non-fixed connection with the fixed cross beam, and the counterweight assembly can swing left and right in the direction perpendicular to the axis of the polished sucker rod sample.
10. The experimental platform for testing the fatigue performance of the polished pumping rod under the condition of the tensile and bending superimposed deformation of claim 9, wherein a load adjusting device is arranged on the side surface of the counterweight assembly and used for dynamically adjusting the weight and the position of the counterweight assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110175748.5A CN112857777B (en) | 2021-02-06 | 2021-02-06 | Fatigue performance experiment platform for polished pumping rod under stretching and bending superposition deformation working conditions |
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| CN115266356A (en) * | 2022-08-12 | 2022-11-01 | 哈尔滨工业大学 | Tension-bending coupling static strength testing device and testing method |
| CN117490947A (en) * | 2024-01-03 | 2024-02-02 | 胜利油田东强机电设备制造有限公司 | Polished rod sealing effect pressure measuring device |
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| CN117490947A (en) * | 2024-01-03 | 2024-02-02 | 胜利油田东强机电设备制造有限公司 | Polished rod sealing effect pressure measuring device |
| CN117490947B (en) * | 2024-01-03 | 2024-03-12 | 胜利油田东强机电设备制造有限公司 | Polished rod sealing effect pressure measuring device |
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