A positioning mechanism of a petroleum pipe external thread top diameter measuring instrument

Abstract

The application discloses a positioning mechanism of a petroleum pipe external thread top diameter measuring instrument, which is installed on the external thread top diameter measuring instrument and used, two rollers of the positioning mechanism are in contact with the inner hole of the pipe body to form V-shaped groove positioning, the centering principle of the V-shaped groove positioning is utilized to make the line connecting the two contacts of the external thread top diameter measuring instrument pass through the center of the pipe body, and when measuring, only one circle of the pipe body rotation (or the rotation of the measuring tool around the pipe body) is needed to find the diameter deviation of the external thread top, and the measuring instrument does not need to swing at different positions to find the inflection point to read the diameter deviation of the external thread top, so that the artificial measurement error is reduced, the labor intensity is lowered, and the measurement is more convenient and accurate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of thread detection instrument, and relates to a positioning mechanism of an external thread top diameter measuring instrument for oil pipes. BACKGROUND

[0002] At present, the external thread top diameter measuring instrument is widely used in the processing and measuring industry of the oil pipe thread. This measuring method is to first calibrate the measuring instrument with a gauge block, and find the deviation of the external thread top diameter by comparison measurement. When measuring, the two contact points should pass through the center of the pipe body, and the pipe body should be measured at different positions. The skill requirement for the operator is high, the labor intensity is large, and the efficiency is low.

[0003] A large number of oil pipes are used in the oil and gas industry, and these pipes are mainly connected by threads. At present, the Processing and Measuring of Thread for Casing, Tubing and Line Pipe (API 5B) and the Processing and Measuring of Rotary Shouldered Thread (API 7-2) widely used in the world have clear provisions for the processing and measuring method of the thread on the oil pipe. Since the working environment of the oil pipe is harsh, some pipes work in the environment of several thousand meters or even ten thousand meters underground. In addition to bearing its own weight, the pipe also bears high temperature, high pressure and even harmful substances. Therefore, the oil thread not only needs to ensure sufficient connection strength, but also needs to ensure certain sealing performance. Otherwise, once the thread connection fails, the oil well may be scrapped or oil may leak, which will cause huge losses.

[0004] Oil and gas as the main energy occupies an important position in the national economy. Several large steel plants in China produce a large number of oil pipes every year. In the past, the oil thread single parameter measuring instrument used by domestic enterprises was mainly imported. In recent years, domestic enterprises can independently produce the measuring instrument through research and development, and improve the measuring instrument according to the actual use in production. The external thread top diameter measuring instrument is widely used in the processing and measuring industry of the oil pipe thread. This measuring method is to first calibrate the measuring instrument with a gauge block, and find the deviation of the external thread top diameter by comparison measurement. When measuring, the two contact points should pass through the center of the pipe body, and the pipe body should be measured at different positions. The skill requirement for the operator is high, the labor intensity is large, and the efficiency is low. SUMMARY

[0005] The purpose of the present application is to provide a positioning mechanism of an external thread top diameter measuring instrument for oil pipes. The mechanism is installed on the external thread top diameter measuring instrument for use. The two rollers of the positioning mechanism are in contact with the inner hole of the pipe body to form a V-shaped groove positioning. The line connecting the two contact heads of the external thread top diameter measuring instrument passes through the center of the pipe body. When measuring, only one rotation of the pipe body (or the measuring tool rotating around the pipe body) is needed to find the diameter deviation of the external thread top. It is not necessary to swing the measuring instrument at different positions to find the inflection point to read the diameter deviation of the external thread top. The measurement is more convenient and accurate.

[0006] To achieve the above object, the present application adopts the following technical solutions:

[0007] A positioning mechanism of an external thread top diameter measuring instrument of a petroleum pipe, the positioning mechanism is installed and positioned based on two guide rail arms of the external thread top diameter measuring instrument, two rollers of the positioning mechanism are in contact with the cylindrical surface of the inner hole of the pipe body to form a V-shaped groove positioning, then the symmetry center plane of the two guide rail arms passes through the center of the pipe body. As the two contacts of the measuring instrument are on the symmetry center plane of the two guide rail arms, as long as the positioning mechanism can ensure that the symmetry center plane of the two guide rail arms passes through the center of the pipe body, the two contacts of the measuring instrument can pass through the center of the pipe body.

[0008] The positioning mechanism comprises a deep groove ball bearing, a pressing plate, a fixed seat, a sliding block, a connecting shaft, an adjusting shaft, a tension spring and a handle. The fixed seat is the basis of the whole positioning mechanism, and has a linear guide rail on the top, and the linear guide rail has a sliding block on the top, and the sliding block has a connecting shaft, an adjusting shaft, a round gasket, an internal hexagonal cylindrical head screw, a round nut at two ends, and has a tension spring and a handle in the middle.

[0009] Further, the fixed seat is installed on the guide rail arm of the external thread top diameter measuring instrument, the positioning mechanism is adjusted to an appropriate position, the deep groove ball bearing is in contact with the inner hole of the pipe body, and the sliding block is moved to the right side of the fixed seat by 3-5mm, so as to generate a certain pre-pressing amount, and then the pressing plate is used to lock the positioning mechanism;

[0010] Further, the sliding block slides through the linear guide rail installed on the fixed seat, and the deep groove ball bearing is in contact with the inner hole of the pipe body under the tension of the tension spring;

[0011] Further, according to the measurement position of the thread top diameter, the adjusting shaft can be adjusted to an appropriate length size on the connecting shaft, so that the deep groove ball bearing is basically aligned with the two contacts of the external thread top diameter measuring instrument, and the force balance is ensured;

[0012] Further, the left end of the tension spring is installed on the fixed seat, and the right end is installed on the sliding block, after the fixed seat is locked on the guide rail arm of the external thread top diameter measuring instrument, the tension spring always maintains a left tension on the sliding block, so that the deep groove ball bearing is in contact with the inner hole of the pipe body;

[0013] Further, the handle can be used to pull the sliding block to move to the right, when the external thread top diameter measuring instrument starts to measure and enters the pipe body or measures and exits the pipe body, the handle is used to pull the sliding block to move to the right, so that the measuring instrument enters or exits, and the friction between the deep groove ball bearing and the inner hole of the pipe body is reduced;

[0014] Further, the outer circle of the connecting shaft has symmetrical long waist type grooves on both sides, so that the adjusting shaft can be adjusted to a certain length, the adjusting shaft has a through hole through which a screw can pass, and after adjustment, the round gasket, the internal hexagonal cylindrical head screw and the round nut can be conveniently locked;

[0015] Further, the outer circle surface of the connecting shaft has scale lines indicating the size of the outer thread measurement position, and the adjusting shaft is adjusted to a proper length according to the length size of the outer thread measurement position, and the scale lines on the side surface of the round nut are aligned with the scale lines on the outer circle surface of the connecting shaft to lock.

[0016] Compared with the prior art, the present application has the following beneficial technical effects:

[0017] The present application is a positioning mechanism for an oil pipe outer thread top diameter measuring instrument, characterized in that the mechanism is installed on the outer thread top diameter measuring instrument for use, two rollers of the positioning mechanism are in contact with the inner hole of the pipe body to form a V-shaped groove positioning, and the connecting line of the two contacts of the outer thread top diameter measuring instrument passes through the center of the pipe body.

[0018] The fixed seat is the basis of the entire positioning mechanism, and the positioning mechanism is installed on the guide rail arm of the outer thread top diameter measuring instrument by the fixed seat, and then the positioning mechanism is locked by the pressing plate, so that the overall installation is convenient.

[0019] The positioning mechanism is adjusted to a proper position according to the inner hole size of the outer thread pipe body, the deep groove ball bearing is in contact with the inner hole of the pipe body, and the slider is moved to the right side of the fixed seat by 3-5mm, so as to generate a certain pre-pressing amount, so that a set of positioning mechanism can be used for pipe body measurement of different inner hole diameters, the application range is wide, the specification of the positioning mechanism can be reduced, and the cost of the measuring instrument can be reduced.

[0020] The slider slides through the linear guide rail installed on the fixed seat, and under the tension of the tension spring, the deep groove ball bearing can be in contact with the inner hole of the pipe body, and a proper measuring force can be ensured, so that the measurement is accurate and reliable.

[0021] The handle can be used to pull the slider to the right, and when the outer thread top diameter measuring instrument starts to measure and enters the pipe body or measures and exits the pipe body, the handle is used to pull the slider to the right, so that the measuring instrument enters or exits, the friction force between the deep groove ball bearing and the inner hole of the pipe body is reduced, and the service life of the positioning mechanism is improved.

[0022] The outer circle of the connecting shaft has symmetrical long waist type grooves on both sides, and scale lines indicating the size of the outer thread measurement position. The adjusting shaft has a through hole through which a screw can pass, and the two ends of the inner hexagonal cylindrical head screw have round washers and round nuts, respectively. According to the length size of the outer thread measurement position, the adjusting shaft can be adjusted to a proper length, and locking is convenient.

[0023] The two rollers of the positioning mechanism adopt deep groove ball bearings, so that the deep groove ball bearings are in contact with the inner hole of the pipe body to form rolling friction, and the friction resistance is reduced, so that the operation is convenient during measurement.

[0024] The pressure plate, fixed base, and slider parts are all made of aluminum alloy, which effectively reduces the weight of the measuring tool while ensuring mechanical strength, making it more convenient to use. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the installation and use of the present invention.

[0026] Figure 2 This is the front view of the positioning mechanism of the external thread top diameter measuring instrument.

[0027] Figure 3 Left view of the positioning mechanism of the external thread top diameter measuring instrument.

[0028] Figure 4 This is a schematic diagram illustrating the measurement principle of the present invention.

[0029] Among them, 1. Screw; 2. Washer; 3. Deep groove ball bearing; 4. Connecting shaft; 5. Adjusting shaft; 6. Round nut; 7. Slider; 8. Locking nut; 9. Flat key; 10. Screw; 11. Screw; 12. Linear guide rail; 13. Handle; 14. Screw; 15. Fixing seat; 16. Lower pressure plate; 17. Set screw; 18. Screw; 19. Tension spring; 20. Round washer; 21. Screw. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings:

[0031] like Figures 1 to 4 As shown, a positioning mechanism for an external thread diameter measuring instrument for oil pipes includes a deep groove ball bearing, a lower pressure plate, a fixed base, a slider, a connecting shaft, an adjusting shaft, a tension spring, and a handle. The fixed base is the foundation of the entire positioning mechanism, with a linear guide rail on it. A slider is mounted on the linear guide rail, and at both ends of the slider are a connecting shaft, an adjusting shaft, a round washer, an internal hexagonal head screw, a round nut, and a deep groove ball bearing. A tension spring and a handle are located in the middle.

[0032] The fixed seat is installed on the guide arm of the external thread top diameter measuring instrument. Adjust the positioning mechanism to the appropriate position so that the deep groove ball bearing contacts the inner hole of the tube, and move the slider 3-5mm to the right of the fixed seat to generate a certain preload. Then, use the lower pressure plate to lock the positioning mechanism.

[0033] The slider slides along a linear guide rail mounted on a fixed base, ensuring contact between the deep groove ball bearing and the inner bore of the tube under the tension of the tension spring. The adjusting shaft can be adjusted to an appropriate length on the connecting shaft according to the measurement position of the thread top diameter, so that the deep groove ball bearing is basically aligned with the two contacts of the external thread top diameter measuring instrument, ensuring force balance. The left end of the tension spring is mounted on the fixed base, and the right end is mounted on the slider. When the fixed base is locked onto the guide rail arm of the external thread top diameter measuring instrument, the tension spring maintains a leftward tension on the slider, ensuring contact between the deep groove ball bearing and the inner bore of the tube. The handle can be used to pull the slider to the right, when the external thread top diameter is measured... When the measuring instrument begins to enter the tube or exits the tube after measurement, use the handle to pull the slider to the right to facilitate the entry or exit of the measuring instrument and reduce the friction between the deep groove ball bearing and the inner hole of the tube. The outer circle of the connecting shaft has symmetrical elongated grooves on both sides to adjust the length of the adjusting shaft. The adjusting shaft has through holes through which screws can pass. After adjustment, it can be easily locked with round washers, hexagon socket head cap screws, or round nuts. The outer circle surface of the connecting shaft has scale lines indicating the measurement position of the external thread. Adjust the adjusting shaft to the appropriate length according to the length of the external thread measurement position. After aligning the scale lines on the side of the round nut with the scale lines on the outer circle surface of the connecting shaft, lock it in place.

[0034] The structural principle and usage steps of the present invention will be further explained below with reference to the accompanying drawings:

[0035] First, calibrate the top diameter measuring instrument using the normal calibration method and zero the indicator.

[0036] Then press Figure 1 The positioning mechanism is installed on the external thread diameter measuring instrument. During operation, loosen the locking screw, place the upper part on the guide arm first, and then use the locking screw to slightly lock the lower part.

[0037] Place the measuring instrument on the tube and adjust the positioning mechanism to the appropriate position. Slightly tilt the measuring instrument and pull the slider of the positioning mechanism to the right so that the moving probe contacts the thread crest, while the roller enters the tube. Then apply a slight force to the measuring instrument in the opposite direction to the indicator to compress the moving contact, and the stationary contact subsequently contacts the thread crest. Place the measuring instrument base plate firmly against the tube end of the product being measured, adjust the positioning mechanism to ensure the roller contacts the inner hole, and move the fixed seat 3-5 mm to the left to create a certain preload on the slider. Then lock the positioning mechanism.

[0038] Adjust the axial position of the roller. Loosen the screws on the connecting shaft, adjust the adjusting shaft to the corresponding scale value according to the measured position of the thread top diameter (align the scale line on the edge of the round nut with the scale line on the connecting shaft), and then tighten it.

[0039] Place the entire set of measuring instruments with the positioning mechanism installed on the calibration block to check if the zero position is accurate. If there is a deviation, recalibrate the zero position until it is calibrated.

[0040] Position the zeroed gauge on the end of the externally threaded product, the gauge is slightly tilted and the positioning mechanism slider is pulled to the right so that the active probe and the thread crest are in contact and the rollers are in the tube, then a slight force is applied to the gauge in the opposite direction to the dial to compress the active probe, the active probe then contacts the thread crest.

[0041] The gauge base is pressed against the end of the product being measured.

[0042] As the tube is rotated one revolution (or the gauge is rotated around the tube), the dial will show the deviation of the thread crest diameter.

Claims

1. A positioning mechanism for a top diameter gauge for an external petroleum pipe thread, characterized by, The positioning mechanism comprises a deep groove ball bearing (3), a lower pressing plate (16), a fixing base (15), a sliding block (7), a connecting shaft (4), an adjusting shaft (5), a tension spring (19) and a handle (13), wherein the fixing base (15) is the base of the whole positioning mechanism, and has a linear guide rail (12) on the top, the linear guide rail (12) has the sliding block (7) on the top, the sliding block (7) has the connecting shaft (4), the adjusting shaft (5), a round washer (20), a inner hexagonal head screw (21), a round nut (6) and the deep groove ball bearing (3) on both ends, and has the tension spring (19) and the handle (13) in the middle. The fixing base (15) is installed on the guide rail arm of the external thread top diameter measuring instrument, the sliding block (7) slides through the linear guide rail (12) installed on the fixing base (15), and the deep groove ball bearing (3) is ensured to be in contact with the inner hole of the pipe body under the tension of the tension spring (19); the left end of the tension spring (19) is installed on the fixing base (15), the right end is installed on the sliding block (7), after the fixing base (15) is locked on the guide rail arm of the external thread top diameter measuring instrument, the tension spring (19) always keeps a left tension on the sliding block (7), so that the deep groove ball bearing (3) is in contact with the inner hole of the pipe body; the handle (13) is connected with the sliding block to pull the sliding block (7) to move rightwards, the adjusting shaft (5) has a through hole passing through a screw, the connecting shaft (4) has a scale line indicating the measured position size of the external thread on the outer circular surface, the adjusting shaft (5) is adjusted to a proper length according to the length size of the measured position of the external thread, and the scale line on the side of the round nut (6) is aligned with the scale line on the outer circular surface of the connecting shaft (4) and then locked.

2. A positioning mechanism for a top diameter measuring instrument for external threads of oil country tubular goods according to claim 1, characterized in that The fixing base (15) is installed on the guide rail arm of the external thread top diameter measuring instrument, and then the positioning mechanism is locked by the lower pressing plate (16), so that the whole installation is convenient.

3. A positioning mechanism for a top diameter measuring instrument for petroleum pipe external threads according to claim 1, characterized in that, The positioning mechanism is adjusted to a proper position according to the inner hole size of the measured external thread pipe body, so that the deep groove ball bearing (3) is in contact with the inner hole of the pipe body, and the sliding block (7) moves 3-5 mm rightwards to the fixing base (15), so that a pre-pressing amount is generated.

4. A positioning mechanism for a top diameter gauge for an external petroleum pipe thread, according to claim 1, characterized in that The sliding block (7) slides through the linear guide rail (12) installed on the fixing base (15), and can ensure that the deep groove ball bearing (3) is in contact with the inner hole of the pipe body and that a proper measuring force is ensured under the tension of the tension spring (19).

5. A positioning mechanism for a top diameter gauge for an external petroleum pipe thread, according to claim 1, wherein The connecting shaft (4) has symmetrical long waist type grooves on both sides of the outer circle, and a scale line indicating the measured position size of the external thread.

6. A positioning mechanism for a top diameter gauge for an external petroleum pipe thread, according to claim 1, wherein The adjusting shaft (5) has a through hole passing through a screw, the inner hexagonal head screw (21) has a round washer (20) and a round nut (6) on both ends, and the adjusting shaft (5) is adjusted to a proper length according to the length size of the measured position of the external thread.

7. A positioning mechanism for a top diameter gauge for an external petroleum pipe thread, according to claim 1, wherein The two rollers of the positioning mechanism adopt the deep groove ball bearing (3).

8. A positioning mechanism for a top diameter gauge for an external petroleum pipe thread, according to claim 1, wherein The lower pressing plate (16), the fixing base (15) and the sliding block (7) are made of aluminum alloy material.

9. A positioning mechanism for a top diameter gauge for an external petroleum pipe thread, according to claim 1, wherein The adjusting shaft (5) has a through hole passing through a screw, and is locked by the round washer (20), the inner hexagonal head screw (21) and the round nut (6) after adjustment.

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