Pipe fitting torsion testing machine

Abstract

The utility model relates to the technical field of detection and testing, and provides a pipe fitting torsion testing machine. The pipe fitting torsion testing machine comprises a base, a driven mechanism, a driving mechanism and a vertical loading mechanism, a groove is formed in the upper surface of the base, a sliding groove is further formed in the upper surface of the base, and the driven mechanism is connected into the groove. According to the pipe fitting torsion testing machine provided by the utility model, a torsion load loading system, an axial pressure load loading system and a transverse pressure load loading system are highly integrated, so that torsion, axial and bending three-axis composite loading can be realized on single equipment unprecedentedly; the real stress environment of pipe fittings such as geological drill rods under extreme working conditions is reproduced to the maximum extent, compared with a traditional single-axis or two-dimensional loading test, the test result can more accurately predict the actual service performance and failure mode of the pipe fittings, and the applicability is wider.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of detection test technology especially relates to a pipe fitting torsion testing machine. BACKGROUND

[0002] The torsion testing machine as the key equipment of material test plays the indispensable role in material science, engineering design and manufacturing industry, and its core function is to evaluate the various mechanical properties of material under torsion load, in the field of mechanical transmission and large structure engineering, the safety and reliability of pipe fitting as the core load bearing component are very important, therefore need to carry out torsion test.

[0003] The basic structure of traditional pipe fitting torsion testing machine usually includes a base, and the fixed clamping device and the rotating clamping device respectively arranged at both ends of the base, and its working principle is to drive the rotating clamping device through the motor to apply torque to the test piece fixed by both end clamps to test its torsional performance, however, in many actual working conditions, the load borne by the pipe fitting is far from single torsion load, such as geological drill rod when operating in the well, not only has to bear huge torque, but also has to bear axial pressure from the upper drill string and lateral force caused by well wall friction or stratum change, therefore there is great limitation.

[0004] Therefore, it is necessary to provide a new pipe fitting torsion testing machine to solve the above technical problems. UTILITY MODEL CONTENT

[0005] In order to solve the above technical problems, the utility model provides a pipe fitting torsion testing machine.

[0006] The utility model provides a pipe fitting torsion testing machine, it includes: base, driven mechanism, driving mechanism and vertical loading mechanism, the upper surface of base is provided with recess, the upper surface of base is also provided with the sliding slot, be connected with driven mechanism in the recess, and driven mechanism includes axial servo cylinder, push board, axial force sensor, T shaped sliding block, driven frame board, torque sensor and driven three jaw chuck, the inner side surface of recess installs axial servo cylinder, and the output end of axial servo cylinder installs push board, and the side surface of push board installs axial force sensor, and the side surface of axial force sensor installs T shaped sliding block matched with recess, and the upper surface of T shaped sliding block is fixedly connected with driven frame board, and the side surface of driven frame board installs torque sensor, and the input end of torque sensor installs driven three jaw chuck, the upper surface of base is connected with driving mechanism, and driving mechanism includes driving frame board, torque motor, speed reducer and driving three jaw chuck, and the upper surface of base is fixedly connected with driving frame board, and the side surface of driving frame board is equipped with torque motor, and the output end of torque motor installs speed reducer, and speed reducer installs on driving frame board, and the output end of speed reducer penetrates driving frame board and is fixedly connected with driving three jaw chuck through the shaft coupling, and vertical loading mechanism is installed in the sliding slot, and vertical loading mechanism includes servo motor, screw rod, T shaped nut block, beam frame, transverse servo cylinder, fixed plate, transverse force sensor and V shaped pressure block, the inner side surface of sliding slot installs servo motor, and the output end of servo motor is fixedly connected with screw rod through the shaft coupling, and the other end of screw rod is rotatably connected with the inner side surface of sliding slot, and T shaped nut block is screwed on screw rod, and the upper surface of T shaped nut block is fixedly connected with beam frame, and the lower surface of beam frame installs transverse servo cylinder, and the output end of transverse servo cylinder installs fixed plate, and the lower surface of fixed plate installs transverse force sensor, and the lower surface of transverse force sensor installs V shaped pressure block.

[0007] Preferably, the side surface of the driven frame board is provided with a torque display instrument, and the torque display instrument is electrically connected with the torque sensor.

[0008] Preferably, the side surface of the driven frame board is provided with an axial force display instrument, and the axial force display instrument is electrically connected with the axial force sensor.

[0009] Preferably, the side surface of the driven frame board is fixedly connected with the upper surface of the T-shaped sliding block through a driven rib block.

[0010] Preferably, the side surface of the driving frame board is fixedly connected with the upper surface of the base through a driving rib block.

[0011] Preferably, the side surface of the beam frame is provided with a transverse force display instrument, and the transverse force display instrument is electrically connected with the transverse force sensor.

[0012] Preferably, mounting holes are formed in the four corners of the base.

[0013] Compared with the related art, the pipe twisting testing machine has the following beneficial effects:

[0014] The pipe twisting testing machine highly integrates the twisting load, axial pressure load and transverse pressure load into one, can realize three-axis composite loading of twisting, shaft and bending on a single device, maximally reproduces the real stress environment of the pipe such as the geological drill pipe under extreme working conditions, and can more accurately predict the actual service performance and failure mode of the pipe, and has wider applicability. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic view of the utility model;

[0016] Figure 2 is a structural schematic view of the utility model from another angle;

[0017] Figure 3 is a structural schematic view of the utility model from the top.

[0018] Reference signs in the drawing: 1, base; 2, mounting hole; 3, groove; 4, sliding groove; 5, driving rack plate; 6, torque motor; 7, speed reducer; 8, driving three-jaw chuck; 9, driving rib block; 10, T-shaped nut block; 11, beam frame; 12, transverse servo electric cylinder; 13, fixed plate; 14, transverse force sensor; 15, V-shaped pressing block; 16, T-shaped sliding block; 17, driven rack plate; 18, torque sensor; 19, driven three-jaw chuck; 20, driven rib block; 21, torque display instrument; 22, axial force display instrument; 23, axial servo electric cylinder; 24, push plate; 25, axial force sensor; 26, servo motor; 27, screw rod; 28, transverse force display. DETAILED DESCRIPTION

[0019] The utility model will be further described below in combination with the drawings and embodiments.

[0020] Please refer to Figure 1 , Figure 2 and Figure 3 , among which, Figure 1 is a structural schematic view of the utility model; Figure 2 is a structural schematic view of the utility model from another angle; Figure 3 is a structural schematic view of the utility model from the top. It comprises a base 1, a driven mechanism, a driving mechanism and a vertical loading mechanism.

[0021] Reference Figure 1 and Figure 3As shown, the upper surface of the base 1 is provided with a groove 3, and the upper surface of the base 1 is also provided with a sliding groove 4, the groove 3 is connected with a driven mechanism, the driven mechanism comprises an axial servo cylinder 23, a push plate 24, an axial force sensor 25, a T-shaped sliding block 16, a driven rack plate 17, a torque sensor 18 and a driven three-jaw chuck 19, an inner side of the groove 3 is provided with the axial servo cylinder 23, an output end of the axial servo cylinder 23 is provided with the push plate 24, one side of the push plate 24 is provided with the axial force sensor 25, one side of the axial force sensor 25 is provided with the T-shaped sliding block 16 matched with the groove 3, an upper surface of the T-shaped sliding block 16 is fixedly connected with the driven rack plate 17, one side of the driven rack plate 17 is provided with the torque sensor 18, an input end of the torque sensor 18 is provided with the driven three-jaw chuck 19, the upper surface of the base 1 is connected with a driving mechanism, the driving mechanism comprises a driving rack plate 5, a torque motor 6, a speed reducer 7 and a driving three-jaw chuck 8, the upper surface of the base 1 is fixedly connected with the driving rack plate 5, one side of the driving rack plate 5 is provided with the torque motor 6, an output end of the torque motor 6 is provided with the speed reducer 7, the speed reducer 7 is installed on the driving rack plate 5, and an output end of the speed reducer 7 penetrates through the driving rack plate 5 and is fixedly connected with the driving three-jaw chuck 8 through a shaft coupling.

[0022] It should be noted that the two ends of the pipe to be tested (such as a geological drill rod) are clamped between the driving three-jaw chuck 8 of the fixed driving mechanism and the driven three-jaw chuck 19 which can move in the groove 3, the torque motor 6 fixed on the driving rack plate 5 is started, the strong torque output by the torque motor 6 is reduced in speed and increased in torque through the speed reducer 7, and then drives the driving three-jaw chuck 8 to rotate through the shaft coupling, since the driven three-jaw chuck 19 at the other end of the pipe is constrained on the driven rack plate 17 through the torque sensor 18, the rotation of the driving end will exert a pure torsional load (simulating drilling torque) on the pipe, the torque sensor 18 measures the reaction torque of the pipe resisting the torsion in real time, and the axial servo cylinder 23 installed in the inner side of the groove 3 is started, the output end of the axial servo cylinder 23 pushes the push plate 24, the pushing force passes through the axial force sensor 25 and the T-shaped sliding block 16 in series in its path in turn, and finally acts on the driven rack plate 17 and the driven three-jaw chuck 19, the T-shaped sliding block 16 slides smoothly in the groove 3, so as to exert an axial pressure (simulating the drilling string pressure) on the clamped pipe, and the axial force sensor 25 detects the pressure value in real time.

[0023] Reference Figure 1 and Figure 3As shown, the chute 4 is provided with a vertical loading mechanism, which comprises a servo motor 26, a lead screw 27, a T-shaped nut block 10, a beam frame 11, a transverse servo cylinder 12, a fixed plate 13, a transverse force sensor 14 and a V-shaped pressing block 15. The servo motor 26 is mounted on the inner side of the chute 4. The output end of the servo motor 26 is fixedly connected with the lead screw 27 through a shaft coupling. The other end of the lead screw 27 is rotatably connected with the inner side of the chute 4. The T-shaped nut block 10 is threadedly sleeved on the lead screw 27. The beam frame 11 is fixedly connected to the upper surface of the T-shaped nut block 10. The transverse servo cylinder 12 is mounted on the lower surface of the beam frame 11. The output end of the transverse servo cylinder 12 is provided with the fixed plate 13. The fixed plate 13 is provided with the transverse force sensor 14 on the lower surface. The transverse force sensor 14 is provided with the V-shaped pressing block 15 on the lower surface.

[0024] It should be noted that the servo motor 26 drives the lead screw 27 to rotate, so that the T-shaped nut block 10 drives the entire beam frame 11 to move to a preset loading position along the chute 4 on the upper surface of the base 1. The transverse servo cylinder 12 mounted below the beam frame 11 is started. The output end of the transverse servo cylinder 12 pushes the fixed plate 13 and drives the transverse force sensor 14 and the V-shaped pressing block 15 below the fixed plate 13 to vertically press downward. The V-shaped pressing block 15 acts on the middle of the span of the pipe or other specified positions, so as to exert a transverse shear force (simulating the well wall support or bending force) on the pipe. The transverse force sensor 14 detects the pressure value in real time.

[0025] Reference Figure 2 As shown, the side surface of the driven frame plate 17 is provided with a torque display instrument 21. The torque display instrument 21 is electrically connected with the torque sensor 18, so as to facilitate the digital display of the torque force detected by the torque sensor 18.

[0026] Reference Figure 2 As shown, the side surface of the driven frame plate 17 is provided with an axial force display instrument 22. The axial force display instrument 22 is electrically connected with the axial force sensor 25, so as to facilitate the digital display of the axial force detected by the axial force sensor 25.

[0027] Reference Figure 1 As shown, the side surface of the driven frame plate 17 is fixedly connected with the upper surface of the T-shaped sliding block 16 through the driven rib block 20, so as to make the structure of the driven frame plate 17 more stable.

[0028] Reference Figure 1 As shown, the side surface of the driven frame plate 17 is fixedly connected with the upper surface of the T-shaped sliding block 16 through the driven rib block 20, so as to make the structure of the driven frame plate 17 more stable.

[0029] Reference Figure 2As shown, one side of the beam frame 11 is provided with a lateral force display 28 which is electrically connected with the lateral force sensor 14, so as to display the lateral force detected by the lateral force sensor 14 in digital form.

[0030] With reference to Figure 1 As shown, the base 1 is provided with mounting holes 2 at four corners, so as to facilitate the mounting and fixing of the base 1.

[0031] The working principle of the utility model is as follows: the two ends of the pipe to be tested (such as a geological drill rod) are respectively clamped between the driving three-jaw chuck 8 of the driving mechanism which is fixed and the driven three-jaw chuck 19 of the driven mechanism which can move in the groove 3, the torque motor 6 fixed on the driving frame plate 5 is started, the strong torque output by the torque motor 6 is reduced and the torque is increased through the speed reducer 7, then the driving three-jaw chuck 8 is driven to rotate through the shaft coupling, since the driven three-jaw chuck 19 at the other end of the pipe is constrained on the driven frame plate 17 through the torque sensor 18, the rotation of the driving end will exert a pure torsional load (simulating drilling torque) on the pipe, the torque sensor 18 measures the reaction torque of the pipe resisting the torsion in real time, and the axial servo cylinder 23 installed in the inner side of the groove 3 is started, the output end of the axial servo cylinder 23 pushes the push plate 24, the pushing force sequentially passes through the axial force sensor 25 and the T-shaped sliding block 16 which are connected in series in the path, and finally acts on the driven frame plate 17 and the driven three-jaw chuck 19, the T-shaped sliding block 16 smoothly slides in the groove 3, so that an axial pressure (simulating the drilling string pressure) is exerted on the clamped pipe, the axial force sensor 25 detects the pressure value in real time, in the use process, the servo motor 26 drives the lead screw 27 to rotate, so that the T-shaped nut block 10 drives the whole beam frame 11 to move to the preset loading position along the sliding groove 4 on the upper surface of the base 1, the transverse servo cylinder 12 installed below the beam frame 11 is started, the output end of the transverse servo cylinder 12 pushes the fixed plate 13, and drives the transverse force sensor 14 and the V-shaped pressing block 15 below the fixed plate 13 to vertically press down, the V-shaped pressing block 15 acts on the middle part of the span of the pipe or other specified positions, so that a transverse shear force (simulating the well wall support or bending force) is exerted on the pipe, the transverse force sensor 14 detects the pressure value in real time, the three kinds of loading processes are decoupled by the controller which is independently controlled outside, so that the load interaction interference is avoided (this is the conventional control technology, and details are not repeated here), for example, the axial servo cylinder 23 and the transverse servo cylinder 12 establish and maintain a constant basic stress environment, in the stable state, the torque motor 6 is independently commanded to exert a dynamic or static torsional load on the pipe for fatigue test, in the whole test process, the operator can directly monitor the real-time changes of the torque, the axial force and the transverse force through the three independent display instruments, and the above-mentioned, the device highly integrates the torsional load, the axial pressure load and the transverse pressure load into one, and can realize the torsion, the shaft and the bending three-axis composite loading on a single device for the first time, and the real stress environment of the pipe such as the geological drill rod under the extreme working condition is maximally reproduced, the test result is more accurate than the traditional single-axis or two-dimensional loading test, the actual service performance and the failure mode of the pipe can be more accurately predicted, and the applicability is wider.

[0032] The circuit and the control involved in the utility model are prior art, and details are not repeated here.

[0033] The above merely illustrates the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which are made by using the content of the present application specification and drawings, are also included in the patent protection scope of the present application.

Claims

1. A pipe torsion testing machine, characterized in that: include: A base (1), wherein a groove (3) is provided on the upper surface of the base (1), and a slide groove (4) is also provided on the upper surface of the base (1); A driven mechanism is connected to the groove (3), and the driven mechanism includes an axial servo electric cylinder (23), a push plate (24), an axial force sensor (25), a T-shaped slider (16), a driven frame plate (17), a torque sensor (18) and a driven three-jaw chuck (19). An inner side surface of the groove (3) is mounted with the axial servo electric cylinder (23), an output end of the axial servo electric cylinder (23) is mounted with the push plate (24), a side surface of the push plate (24) is mounted with the axial force sensor (25), a side surface of the axial force sensor (25) is mounted with a T-shaped slider (16) matching the groove (3), an upper surface of the T-shaped slider (16) is fixedly connected with the driven frame plate (17), a side surface of the driven frame plate (17) is mounted with the torque sensor (18), and an input end of the torque sensor (18) is mounted with the driven three-jaw chuck (19); An active mechanism, wherein the upper surface of the base (1) is connected to the active mechanism, and the active mechanism comprises an active frame plate (5), a torque motor (6), a reducer (7) and an active three-jaw chuck (8); the upper surface of the base (1) is fixedly connected to the active frame plate (5); a torque motor (6) is provided on one side of the active frame plate (5); a reducer (7) is installed at the output end of the torque motor (6); the reducer (7) is installed on the active frame plate (5); the output end of the reducer (7) passes through the active frame plate (5) and is fixedly connected to the active three-jaw chuck (8) through a coupling; A vertical loading mechanism is installed in the chute (4), and the vertical loading mechanism includes a servo motor (26), a screw rod (27), a T-shaped nut block (10), a beam (11), a transverse servo electric cylinder (12), a fixing plate (13), a transverse force sensor (14) and a V-shaped pressure block (15). A servo motor (26) is installed on an inner side surface of the chute (4), and the output end of the servo motor (26) is fixedly connected to the screw rod (27) through a coupling. The other end of the screw rod (27) is fixedly connected to the One end is rotatably connected to the inner side surface of the slide groove (4), a T-shaped nut block (10) is provided on the threaded sleeve of the screw rod (27), the upper surface of the T-shaped nut block (10) is fixedly connected to the beam frame (11), the lower surface of the beam frame (11) is mounted with a transverse servo electric cylinder (12), the output end of the transverse servo electric cylinder (12) is mounted with a fixed plate (13), the lower surface of the fixed plate (13) is mounted with a transverse force sensor (14), and the lower surface of the transverse force sensor (14) is mounted with a V-shaped pressure block (15).

2. The pipe torsion testing machine according to claim 1, characterized in that: A torque display (21) is installed on one side of the driven frame plate (17), and the torque display (21) is electrically connected to the torque sensor (18).

3. The pipe torsion testing machine according to claim 1, characterized in that: An axial force display instrument (22) is installed on one side of the driven frame plate (17), and the axial force display instrument (22) is electrically connected to the axial force sensor (25).

4. The pipe torsion testing machine according to claim 1, characterized in that: One side surface of the driven frame plate (17) is fixedly connected to the upper surface of the T-shaped slider (16) via a driven rib (20).

5. The pipe torsion testing machine according to claim 1, characterized in that: One side surface of the active frame plate (5) is fixedly connected to the upper surface of the base (1) via an active rib (9).

6. The pipe torsion testing machine according to claim 1, characterized in that: A lateral force display (28) is installed on one side of the beam frame (11), and the lateral force display (28) is electrically connected to the lateral force sensor (14).

7. The pipe torsion testing machine according to claim 1, characterized in that: The four corners of the base (1) are each provided with mounting holes (2).

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