Tensile strength testing tool for carbon fiber sucker rod
Through the self-swelling tightening form composed of a conical tightening ring and outer sleeve, combined with hydraulic cylinder and tensile sensor, the fixing and tensile strength testing problems of carbon fiber suction rod in harsh environments is solved, achieving simple and reliable test results.
Patent Information
- Application Number
- CN202421898489.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-08-07
AI Technical Summary
The carbon fiber suction rod cannot be effectively fixed and tested in a harsh downhole environment, and the traditional threaded connection method is not suitable.
The self-swelling tightening form consisting of a conical tightening ring and an outer sleeve is combined with a hydraulic cylinder and a tension sensor, and the carbon fiber suction rod is tightened by a conical tightening, and the tensioning strength is measured by the tension sensor.
It realizes stable fixation and tensile strength testing of carbon fiber suction rods, which is easy to install, good repeatability, does not damage the tooling, and the test results are reliable.
Smart Images
Figure CN223154699U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical design, in particular to a tensile strength test tooling for a carbon fiber sucker rod. Background Technique
[0002] Sucker rods are mainly used in oil extraction to connect the pumping unit and the oil pump, and transmit power to pump crude oil from underground to the ground.
[0003] Due to the different depths and geological conditions of oil wells, the working environments of sucker rods are also different, but they generally face harsh downhole conditions.
[0004] Traditional sucker rod materials are generally made of carbon steel, alloy steel or stainless steel. However, no matter which metal material is used to make sucker rods, it is impossible to meet the requirements of lightweight, low cost, corrosion resistance, high temperature resistance and electromagnetic interference resistance in the face of harsh working environments. Based on the above situation, carbon fiber sucker rods have been developed in China through the composite material pultrusion process.
[0005] When the sucker rod is in the working state, it mainly bears tensile force. Although the carbon fiber sucker rod has the advantages of low density, corrosion resistance, good elasticity, reduced failure frequency, high specific modulus, high specific strength, good fatigue resistance and smooth surface. However, due to its material characteristics, the carbon fiber sucker rod cannot be connected to each other by threads like a metal sucker rod. Therefore, how to design a joint to fix the carbon fiber sucker rod and test the tensile strength of the carbon fiber sucker rod has become an urgent problem to be solved in the industry development. Content of the Utility Model
[0006] The purpose of the utility model is to make up for the defects of the existing technology and provide a tensile strength test tooling for a carbon fiber sucker rod.
[0007] The utility model is realized by the following technical solutions:
[0008] A tensile strength test tooling for a carbon fiber sucker rod, comprising a carbon fiber sucker rod, a mounting frame, a hydraulic cylinder fixing plate, a hydraulic cylinder, a tensile force sensor, a tensile seat, a pin, an adapter block and a joint assembly. The two ends of the carbon fiber sucker rod are respectively connected with a joint assembly. The joint assembly includes a tapered clamping ring, an outer sleeve and a set screw. One end of the inner hole of the outer sleeve is an internal thread hole, and the other end is a tapered hole. The aperture of the tapered hole near the internal thread hole is larger than that of the other end. The outer shape of the tapered clamping ring is a cone with the same taper ratio as the tapered hole of the outer sleeve. The tapered clamping ring is placed into the tapered hole of the outer sleeve, and the end of the carbon fiber sucker rod extends into the tapered clamping ring. The set screw is screwed into the outer sleeve from one end of the internal thread hole of the outer sleeve and presses the tapered clamping ring forward, so that the tapered clamping ring tightly clamps the carbon fiber sucker rod. One end of the adapter block is provided with an external thread section matching the internal thread hole of the outer sleeve. The outer sleeves at both ends of the carbon fiber sucker rod are respectively threadedly connected with the adapter blocks, and the other ends of the two adapter blocks are respectively connected with two tensile seats through pins. One tensile seat is fixed on the mounting frame, and the other tensile seat is fixedly connected with the tensile force sensor. The tensile force sensor is screwed onto the hydraulic cylinder, and the hydraulic cylinder is fixedly installed on the hydraulic cylinder fixing plate, and the hydraulic cylinder fixing plate is fixed on the mounting frame. By the tensile force provided by the hydraulic cylinder, it is verified whether the tensile strength of the carbon fiber is sufficient.
[0009] The tapered hole of the outer sleeve is a tapered hole with a taper of 1:80, and the internal thread hole is provided with a thread of M27.
[0010] A nylon gasket is provided between the set screw and the tapered clamping ring to prevent the set screw from directly contacting during the process of pressing the tapered clamping ring into the outer sleeve, thereby avoiding mutual wear between them.
[0011] An external thread of M40×1.5 is provided on the cylinder diameter of the hydraulic cylinder, and it is connected with the tensile force sensor through the external thread. The hydraulic cylinder is externally connected with a high-pressure manual pump, and the elongation and contraction of the cylinder diameter can be manually controlled.
[0012] Open slots are provided at both ends of the tapered clamping ring in the length direction, which can be more easily deformed towards the axis under the extrusion of the outer sleeve to clamp the carbon fiber sucker rod.
[0013] Knurling is provided on the inner wall of the tapered clamping ring to increase the friction force with the carbon fiber sucker rod.
[0014] The mounting frame is a steel beam assembly, which is welded by steel plates with a thickness of 10 mm to 25 mm, and is drilled with a plurality of connection holes with a diameter of 22 mm for fixing each part.
[0015] A counterbore hole with a diameter of 13 mm is drilled in the hydraulic cylinder fixing plate, and 4 M12 threaded holes are drilled at the bottom of the hydraulic cylinder. The hydraulic cylinder is connected to the hydraulic cylinder fixing plate by M12 screws.
[0016] The tension sensor is a spoke-type sensor. There is an M40×1.5 threaded hole in the middle of the tension sensor and it is externally connected to a tension display instrument.
[0017] The tension seat is a welded part. It has 8 M10 threaded holes at one end connected to the tension sensor, and a through hole at the other end, and is connected to the adapter block through a pin.
[0018] The advantages of the present utility model are as follows: The fixing form of the joint assembly of the present utility model and the carbon fiber sucker rod completely abandons the threaded connection form. The self-tightening form adopted has a simple structure, is convenient for installation, gets tighter as it is pulled, and will not damage the tooling, and has good repeatability of operation. Description of the Drawings
[0019] Figure 1 It is a schematic structural diagram of the present utility model.
[0020] Figure 2 It is Figure 1 sectional view A-A in
[0021] Figure 3 Schematic structural diagram of the tapered clamping ring in the present utility model;
[0022] Figure 4 It is Figure 3 sectional view B-B in
[0023] The marks in the drawings are: 1 steel beam assembly, 2 hydraulic cylinder fixing plate, 3 hydraulic cylinder, 4 tension sensor, 5 tension seat, 6 adapter block, 7 pin, 8 carbon fiber sucker rod, 9 set screw, 10 nylon gasket, 11 outer sleeve, 12 tapered clamping ring, 13 opening groove. Detailed Embodiment
[0024] The following provides a detailed embodiment of a tensile strength test tooling for a carbon fiber sucker rod with a diameter of 16 mm and a length of 9 m of the present utility model. The tensile force for this test is 24 tons. Embodiment
[0025] Put the tapered clamping ring 12 into the outer sleeve 11. When putting it in, it should be noted that the taper directions of the two should not be misaligned. Insert one end of the carbon fiber sucker rod 8 into the tapered clamping ring 12, put in the nylon gasket 10, and push the tapered clamping ring 12 towards one end of the outer sleeve through the set screw 9, so that the tapered clamping ring 12 shrinks inward to clamp the carbon fiber sucker rod 8 through the tapered surface between the two. The other end of the carbon fiber sucker rod 8 is installed with a joint assembly in the same way. After installing the joint assembly, asFigure 2 As shown, the adapter block 6 is screwed onto one end of the outer sleeve 11, and the installation of the carbon fiber sucker rod 8 and the joint assembly is now completed.
[0026] like Figure 3 , 4 As shown, open grooves 13 are provided at both ends of the conical clamping ring 12 in the length direction, so that it can be more easily deformed toward the axis under the extrusion of the outer sleeve 11 to clamp the carbon fiber sucker rod 8.
[0027] Next, the steel beam assembly 1 is installed. According to the measured length of the carbon fiber sucker rod 8, Figure 1 As shown, the steel beams of different lengths are adjusted in position and connected via M20 screws, the hydraulic cylinder fixing plate 2 and the hydraulic cylinder 3 are connected via M12 screws, and then the hydraulic cylinder fixing plate 2 is connected to the steel beam assembly 1 via M20 screws, and then the tension sensor 4 is screwed into the cylinder bore of the hydraulic cylinder 3, and finally the tension sensor 4 is connected to the tension seat 5 via 8 M10 screws, and at the same time, the tension seat at the other end is also connected to the other end of the steel beam assembly 1 via M20 screws.
[0028] The hydraulic cylinder 3 is pushed out to a suitable length by an external high-pressure manual pump, and the adapter block 6 is connected to the tension seat 5 by a pin 7. At the same time, the adapter block 6 at the other end is also connected to the tension seat by a pin 7. At this point, the entire carbon fiber sucker rod tensile strength test tooling has been installed. Before the experiment, strain gauges are attached to the carbon fiber sucker rod 8 at every 3 meters to detect the deformation of the carbon fiber sucker rod during the process of increasing tension, and the two ends of the carbon fiber sucker rod are marked with a paint pen at a position 100mm away from the end face of the outer sleeve 11. After the experiment is over, the distance between the mark 1 and the end face of the outer sleeve 11 is measured again to observe whether the carbon fiber sucker rod is displaced with the joint assembly to verify whether the connection between this joint assembly and the sucker rod is firm and reliable. After the experiment begins, the cylinder diameter of the hydraulic cylinder 3 is retracted by an external high-pressure manual pump, thereby giving the carbon fiber sucker rod a tension, and the strain gauge displacement is recorded at 5 tons, 10 tons, 15 tons, 20 tons, and 24 tons of tension respectively to analyze the experimental results.
[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as the present invention.
Claims
1. A tensile strength test tooling for carbon fiber sucker rods, characterized in that: It includes a carbon fiber sucker rod, a mounting bracket, a hydraulic cylinder fixing plate, a hydraulic cylinder, a tensile force sensor, a tensile force seat, a pin, an adapter block and a joint assembly. The two ends of the carbon fiber sucker rod are respectively connected with a joint assembly. The joint assembly includes a tapered clamping ring, an outer sleeve and a set screw. One end of the inner hole of the outer sleeve is an internal thread hole, and the other end is a tapered hole. The aperture of the tapered hole near the internal thread hole is larger than that of the other end. The tapered clamping ring has a tapered shape with the same taper ratio as the tapered hole of the outer sleeve. The tapered clamping ring is placed into the tapered hole of the outer sleeve, and the end of the carbon fiber sucker rod extends into the tapered clamping ring. The set screw is screwed into the outer sleeve from one end of the internal thread hole of the outer sleeve and presses the tapered clamping ring forward, so that the tapered clamping ring clamps the carbon fiber sucker rod tightly. One end of the adapter block is provided with an external thread section matching the internal thread hole of the outer sleeve. The outer sleeves at both ends of the carbon fiber sucker rod are respectively thread-connected with the adapter blocks, and the other ends of the two adapter blocks are respectively connected with two tensile force seats through pins. One tensile force seat is fixed on the mounting bracket, and the other tensile force seat is fixedly connected with the tensile force sensor. The tensile force sensor is screwed tightly on the hydraulic cylinder, the hydraulic cylinder is fixedly installed on the hydraulic cylinder fixing plate, and the hydraulic cylinder fixing plate is fixed on the mounting bracket.
2. The tensile strength testing tooling for a carbon fiber sucker rod according to claim 1, characterized in that: The tapered hole of the outer sleeve is a tapered hole with a taper of 1:80, and the internal thread hole is provided with a thread of M27.
3. The tensile strength testing tooling for a carbon fiber sucker rod according to claim 1, characterized in that: A nylon gasket is provided between the set screw and the tapered clamping ring.
4. A tensile strength test tooling for a carbon fiber sucker rod according to claim 1, characterized in that: An external thread of M40×1.5 is provided on the cylinder diameter of the hydraulic cylinder and is connected with the tensile force sensor through the external thread. The hydraulic cylinder is externally connected with a high-pressure manual pump.
5. The tensile strength test tooling for a carbon fiber sucker rod according to claim 1, wherein: Open slots are provided at both ends of the tapered clamping ring in the length direction.
6. The tensile strength testing tooling for a carbon fiber sucker rod according to claim 1, characterized in that: Knurling is provided on the inner wall of the tapered clamping ring.
7. A tensile strength testing tooling for a carbon fiber sucker rod according to claim 1, characterized in that: The mounting bracket is a steel beam assembly, and the steel beam assembly is welded by steel plates with a thickness of 10 mm to 25 mm, and a plurality of connecting holes with a diameter of 22 mm are drilled thereon.
8. The tensile strength testing tooling for a carbon fiber sucker rod according to claim 1, characterized in that: A counterbore with a diameter of 13 mm is opened on the hydraulic cylinder fixing plate, and 4 threaded holes of M12 are opened at the bottom of the hydraulic cylinder. The hydraulic cylinder is connected with the hydraulic cylinder fixing plate through M12 screws.
9. A tensile strength test tooling for a carbon fiber sucker rod according to claim 1, characterized in that: The tensile force sensor is a spoke-type sensor, and a threaded hole of M40×1.5 is provided in the middle of the tensile force sensor and is externally connected with a tensile force display instrument.
10. A tensile strength test tooling for a carbon fiber sucker rod according to claim 1, characterized in that: The tensile force seat is a welded part. One end is provided with 8 threaded holes of M10 and is connected with the tensile force sensor, and the other end is provided with a through hole and is connected with the adapter block through a pin.