A floating device for testing the sliding force of a mechanical tubular column

Abstract

This utility model proposes a floating device for testing the sliding force of a mechanical tubing column, relating to the field of tubing column measuring devices. The device includes a frame; a floating cylinder with its body connected to the frame and the end of its piston rod facing downwards, with the tubing column positioned along the piston rod's pushing path; a clamping assembly comprising several clamping units that approach each other from the side and clamp the tubing column; and a sensor connected to the piston rod end of the floating cylinder and in contact with the end face of the tubing column. The sensor is electrically connected to an external controller to transmit data to the controller. This application significantly improves the stable clamping and thrust application accuracy of the tubing column through the closed-loop controllable thrust output of the floating cylinder and the adaptive clamping design of the multi-shaped grippers. Combined with the real-time dynamic capture of the sliding critical force value by a high-sensitivity Kistler sensor, it achieves precise measurement with millisecond-level response and micro-Newton-level resolution. Furthermore, the modular grippers can be quickly replaced to adapt to different sizes, effectively expanding the applicable scenarios of the equipment.

Description

Technical Field

[0001] This utility model relates to the field of measuring devices for tubular columns, and more particularly to a floating device for testing the sliding force of mechanical tubular columns. Background Technology

[0002] Accurate measurement of the sliding force of the tubing string is crucial for ensuring assembly quality and reliability. Traditional measurement methods often employ fixed clamping mechanisms with static thrust devices, which suffer from insufficient clamping stability and low thrust adjustment precision. This is particularly problematic when dealing with tubing strings of varying specifications or surface conditions, where uneven clamping force distribution or delayed capture of the critical slip point can easily lead to measurement errors. Furthermore, current technologies for monitoring the critical force value at the moment of sliding typically rely on indirect calculations or offline analysis, lacking real-time dynamic feedback capabilities, thus limiting measurement efficiency and data reliability. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the embodiments of this utility model provide a floating device for testing the sliding force of a mechanical tubing column. The technical problem to be solved by this utility model is that the existing tubing column sliding force measurement technology has problems such as insufficient clamping stability, low thrust control accuracy, weak real-time monitoring capability of critical force, and poor adaptability of the gripper, resulting in low reliability of measurement results and difficulty in meeting the requirements of complex working conditions.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a floating device for testing the sliding force of a mechanical tube column, comprising a frame connected to a workbench; a floating cylinder with its cylinder body connected to the frame, the end of its piston rod facing downwards, and the tube column located on the pushing path of the piston rod; a clamping assembly comprising several clamping units, the clamping units approaching each other from the side and clamping the tube column; and a sensor connected to the end of the piston rod of the floating cylinder and in contact with the end face of the tube column, the sensor being electrically connected to an external controller to transmit data to the controller.

[0005] In a preferred embodiment, the clamping assembly includes a wedge block one and a wedge block two. The wedge block one can move vertically, and the wedge block two is horizontally elastically slidably connected to the frame. The wedge block two is located on the moving path of the downward-moving wedge block one, and a clamping element is connected to the wedge block two.

[0006] In a preferred embodiment, auxiliary cylinders are installed on both sides of the frame, and the piston rod of the auxiliary cylinder and the corresponding wedge block are fixed.

[0007] In a preferred embodiment, the clamping assembly further includes a clamping member one and a clamping member two. The clamping member one is horizontally slidably connected to the wedge block two, and the sliding direction is perpendicular to the movement direction of the wedge block two. The clamping member two passes through the clamping member one and abuts against the wedge block two. The clamping member two and the clamping member one are threadedly connected.

[0008] In a preferred embodiment, the clamping assembly includes a positioning plate and locking bolts. The frame has a hole for the tube column to pass through, and a U-shaped positioning plate is placed in the hole. The two arms of the positioning plate are connected to the upper and lower end faces of the hole by locking bolts. The assembly also includes a magnetic chuck and a magnetic rod. The magnetic chuck is connected to the positioning plate, the magnetic rod is connected to the end of the movable rod, and the magnetic rod and the magnetic chuck are magnetically connected.

[0009] In a preferred embodiment, the two arms of the positioning plate are provided with adjustment grooves, and the threaded section of the locking bolt can pass through the adjustment grooves and connect to the frame.

[0010] In a preferred embodiment, the magnetic rod, made of an electromagnetic material, is electrically connected to a power source and a transformer.

[0011] In a preferred embodiment, a limiting groove is formed on the positioning plate, and a retaining edge is fixed on the groove wall of the limiting groove, with the magnetic clamp placed in the corresponding retaining edge.

[0012] In a preferred embodiment, the diameter of the portion where the magnetic chuck and the clamp edge connect is smaller than the width of the limiting groove.

[0013] In a preferred embodiment, the sensor is a Kistler sensor.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] This application significantly improves the stable clamping and thrust application accuracy of the coiled tubing by utilizing the closed-loop controllable thrust output of a floating cylinder and the adaptive clamping design of multi-shaped grippers. Combined with the real-time dynamic capture of the sliding critical force value by a high-sensitivity Kistler sensor, it achieves precise measurement with millisecond-level response and microsecond-level resolution. Furthermore, the modular grippers can be quickly replaced to adapt to coiled tubing of different sizes, shapes, and surface characteristics, effectively expanding the applicable scenarios of the equipment. Attached Figure Description

[0016] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0017] Figure 1 This is a structural diagram of the testing device of this utility model.

[0018] Figure 2 This is a structural diagram of one type of clamping assembly in this utility model.

[0019] Figure 3 for Figure 2 A magnified view of part A in the image.

[0020] Figure 4This is a cross-sectional view of one of the clamping assemblies in this utility model.

[0021] Figure 5 This is a view of the card edge of the present invention placed in the limiting groove.

[0022] The attached figures are labeled as follows: 10, frame; 20, floating cylinder; 30, clamping assembly; 31, position adjusting component; 311, wedge block one; 312, wedge block two; 313, positioning plate; 314, locking bolt; 32, clamping component; 321, clamping component one; 322, clamping component two; 323, magnetic chuck; 324, magnetic rod; 40, sensor. Detailed Implementation

[0023] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0024] Example

[0025] like Figures 1-5 This product consists of several main parts, including frame 10, floating cylinder 20, clamping assembly 30, and sensor 40.

[0026] The frame 10 is fixed to the workbench. The upper part of the frame 10 is used to install the floating cylinder 20, and the lower part is used to install the clamping assembly 30.

[0027] The floating cylinder 20 is a specially designed pneumatic actuator. Its core feature is adaptive compliance. Through internal springs, air pressure buffers or mechanical floating structures, the floating cylinder 20 is allowed to automatically adjust its attitude or stroke according to external resistance or position deviation while applying thrust, so as to avoid rigid collisions or overloads. All of the above are existing technologies. This embodiment does not make any improvements to the floating cylinder 20 itself.

[0028] The floating cylinder 20 includes a cylinder seat and a piston rod. The cylinder seat is detachably connected to the frame 10 via a flange. The piston rod is slidably connected inside the cylinder seat. The cylinder seat drives the piston rod to slide within the cylinder seat via a control unit. The so-called control unit varies depending on the type of floating cylinder 20 selected. Since the method of driving the piston rod to move within the floating cylinder 20 is the same as existing technology, it will not be described in detail in this embodiment.

[0029] The clamping assembly 30 is used to clamp the test tube string and includes a position adjustment component 31 and a clamping component 32.

[0030] The first case in this embodiment.

[0031] The position adjustment component 31 includes a first wedge block 311 and a second wedge block 312. The first wedge block 311 moves up and down along a straight line, and the second wedge block 312 is located on the moving path of the first wedge block 311. When the second wedge block 312 is squeezed by the first wedge block 311, it will move. When the second wedge block 312 is not squeezed by the first wedge block 311, it will reset under the action of elastic force.

[0032] A secondary cylinder capable of pushing a downward telescopic rod is installed on the frame 10. Any commercially available cylinder can be used for this purpose, and its structure is existing technology and will not be described in detail. The secondary cylinders are arranged in pairs on both sides of the frame 10, and the end of the piston rod of each secondary cylinder is fixed to a corresponding wedge block 311. A second wedge block 312 is elastically slidably connected to the frame 10. In terms of the movement path, the first wedge block 311 moves up and down along the Z-axis, while the second wedge block 312 moves left and right along the X-axis.

[0033] The clamping member 32 includes a first clamping member 321 and a second clamping member 322. The first clamping member 321 is slidably connected to the lower end of the second wedge block 312 along the Y-axis direction. The second clamping member 322 passes through the first clamping member 321 and is screwed into the first clamping member 321 by means of a threaded connection. The end of the second clamping member 322 can be pressed onto the second wedge block 312 after passing through the first clamping member 321 to limit the position of the first clamping member 321.

[0034] Through the design of the clamping assembly 30, the position of a pair of clamping members 321 can be moved freely, thereby clamping tubular columns of different sizes.

[0035] It should be noted that the clamping side of clamping component 321 is provided with a V-groove, which is particularly suitable for rotating workpieces.

[0036] The second scenario in this embodiment.

[0037] The position adjustment component 31 includes a positioning plate 313 and a locking bolt 314. A cylindrical or frustum-shaped hole is provided in the frame 10. The positioning plate 313 is arranged in a U-shape inside the hole, and the two arms of the U-shape are respectively limited to the upper and lower end faces of the hole by the locking bolt 314.

[0038] Preferably, both walls of the positioning plate 313 are provided with adjustment grooves, and the threaded section of the locking bolt 314 can move relative to the adjustment grooves. When the locking bolt 314 is screwed into the threaded hole in the frame 10, the upper part of the locking bolt 314 presses against the positioning plate 313 and fixes it. In this way, by moving the two arms of the positioning plate 313, the position and tilt of the positioning plate 313 in the hole can be changed to adapt to rotating workpieces of different sizes.

[0039] The clamping component 32 includes a magnetic chuck 323 and a magnetic rod 324. A limiting groove is formed in the middle of the positioning plate 313. One side of the magnetic chuck 323 is inserted into the limiting groove and can slide within the limiting groove along the opening direction of the groove without falling out. The magnetic rod 324 is detachably threaded to the end of the movable rod of the floating cylinder 20. In use, the magnetic rod 324 is inserted into the center of the tube column but does not contact the tube column. Because the magnetic chuck 323 and the magnetic rod 324 are magnetically attracted, the tube column located in the hole can be clamped by magnetic force. The magnitude of the clamping force depends on the magnetic attraction.

[0040] Furthermore, in order to make the clamping force adjustable, a magnetic rod 324 is made of electromagnetic material. When in use, the terminal of the wire is inserted into the magnetic rod 324, and the wire transmits the current from the power supply to the magnetic rod 324. The power supply can control the magnitude of the current flowing into the magnetic rod 324 through a transformer. The greater the current, the stronger the magnetism carried by the magnetic rod 324. At this time, the magnetic clamp 323 exerts a greater clamping force on the column from the outside.

[0041] To elaborate further, when an electric current passes through a coil made of electromagnetic material, according to Ampere's circuital law, the directional movement of the charge will create a ring-shaped magnetic field around it. If a soft magnetic material such as iron, nickel, or cobalt is added inside the coil, the iron core will be strongly magnetized by the magnetic field generated by the current. The originally disordered magnetic domains within the core will align in the same direction under the influence of the external magnetic field, forming a superimposed magnetic field that significantly enhances the strength of the total magnetic field.

[0042] like Figure 5 Preferably, the groove wall of the limiting groove is provided with clamping edges, and each magnetic chuck 323 is placed on one side of the corresponding clamping edge and limited by the upper and lower clamping edges. This can achieve the purpose of arranging several magnetic chucks 323 at intervals and expand the clamping range of the magnetic chucks 323.

[0043] Preferably, the magnetic chuck 323 can swing between the upper and lower edges, that is, the diameter of the portion of the magnetic chuck 323 that passes through the limiting groove is smaller than the width of the groove. The swingable magnetic chuck 323 can be adjusted up and down to adapt to different rotating workpieces, such as frustums, cylinders, cones, etc.

[0044] It is known that there are at least two positioning plates 313, and there can be three or four.

[0045] In addition, multiple magnetic chucks 323 simultaneously clamp the tubing. If there are uneven processing defects on the tubing, the clamping stability of this design is better than that of the first design.

[0046] The sensor 40 is mounted on the piston rod end of the floating cylinder 20 and is used to make contact with the upper end face of the tubing.

[0047] Preferably, sensor 40 is a Kistler sensor used to monitor the peak change of force value when it changes from static friction to dynamic friction.

[0048] The core of using the Kistler sensor lies in its direct mounting at the contact interface between the end of the piston rod of the floating cylinder 20 and the test tubing. It can be connected via an adapter or clamp, or directly, to accurately capture the axial thrust applied to the tubing in real time. The data exhibits the following pattern: the thrust initially increases linearly (static friction stage), then surges to its peak value (maximum static friction) at the critical sliding moment, subsequently decreasing rapidly and stabilizing as the friction state transitions to kinetic friction. This dynamic process, through high sampling rate and real-time signal processing such as peak detection and filtering, accurately pinpoints the critical sliding force, providing crucial quantitative data for assessing the clamping stability of the tubing string. Since the method of using the Kistler sensor is existing technology, it will not be elaborated further.

[0049] In addition, if the second type of clamping group 30 is adopted, it is appropriate to expand the bandwidth of direct sequence spread spectrum when the Kistler sensor wirelessly transmits data to the controller through the protocol, so as to reduce the impact of electromagnetic interference on data generation. Alternatively, other common techniques are also applicable, such as frequency hopping spread spectrum, adaptive frequency selection, etc. Since these signal processing techniques are existing technologies and are not improvements of this application, they will not be described in detail here.

[0050] In summary, this embodiment designs two clamping methods to handle tubes of different sizes. One is that the clamping assembly 30 uses an adjustable clamping method with three degrees of freedom to reliably clamp the cylindrical tube. The other is that the clamping assembly 30 uses a swingable clamping end to clamp the rotating tube, which is more versatile.

[0051] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A floating device for testing the sliding force of a mechanical tubular column, characterized in that, include: Frame (10), connected to the workbench; A floating cylinder (20) has its cylinder body connected to a frame (10), with the end of the piston rod facing downwards and the tubing located on the pushing path of the piston rod. The clamping assembly (30) includes several clamping units that approach each other from the side and clamp the tubing. The sensor (40) is connected to the piston end of the floating cylinder (20) and contacts the end face of the tube column. The sensor (40) is electrically connected to an external controller to transmit data to the controller.

2. The floating device for testing the sliding force of a mechanical tubular column according to claim 1, characterized in that, The clamping assembly (30) includes a wedge block one (311) and a wedge block two (312). The wedge block one (311) can move vertically, and the wedge block two (312) is horizontally elastically slidably connected to the frame (10). The wedge block two (312) is located on the moving path of the downward-moving wedge block one (311), and a clamping member (32) is connected to the wedge block two (312).

3. The floating device for testing the sliding force of a mechanical tubular column according to claim 2, characterized in that, Auxiliary cylinders are installed on both sides of the frame (10), and the piston rod of the auxiliary cylinder and the corresponding wedge block (311) are fixed.

4. The floating device for testing the sliding force of a mechanical tubular column according to claim 2, characterized in that, The clamping assembly (30) further includes a clamping member one (321) and a clamping member two (322). The clamping member one (321) is horizontally slidably connected to the wedge block two (312), and the sliding direction is perpendicular to the movement direction of the wedge block two (312). The clamping member two (322) passes through the clamping member one (321) and abuts against the wedge block two (312). The clamping member two (322) and the clamping member one (321) are threadedly connected.

5. The floating device for testing the sliding force of a mechanical tubing column according to claim 1, characterized in that, The clamping assembly (30) includes a positioning plate (313) and a locking bolt (314). The frame (10) has a hole for the tube column to pass through. A U-shaped positioning plate (313) is placed in the hole. The two arms of the positioning plate (313) are connected to the upper and lower end faces of the hole by the locking bolt (314). It also includes a magnetic chuck (323) and a magnetic rod (324). The magnetic chuck (323) is connected to the positioning plate (313). The magnetic rod (324) is connected to the end of the movable rod. The magnetic rod (324) and the magnetic chuck (323) are magnetically connected.

6. The floating device for testing the sliding force of a mechanical tubing column according to claim 5, characterized in that, The positioning plate (313) has adjustment slots on its two arms, and the threaded section of the locking bolt (314) can pass through the adjustment slots and connect to the frame (10).

7. The floating device for testing the sliding force of a mechanical tubing column according to claim 5, characterized in that, The magnetic rod (324) made of electromagnetic material is electrically connected to the power supply and the transformer.

8. The floating device for testing the sliding force of a mechanical tubular column according to claim 5, characterized in that, The positioning plate (313) has a limiting groove, and a retaining edge is fixed on the groove wall of the limiting groove. The magnetic chuck (323) is placed in the corresponding retaining edge.

9. A floating device for testing the sliding force of a mechanical tubing column according to claim 5, characterized in that, The diameter of the portion where the magnetic chuck (323) and the chuck edge are connected is smaller than the width of the limiting groove.

10. A floating device for testing the sliding force of a mechanical tubular column according to claim 1, characterized in that, The sensor (40) is a Kistler sensor.

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