Thread thickness measuring instrument based on buttress thread root measurement

Abstract

The utility model discloses a tooth thickness measuring instrument based on buttress thread root measurement. The tooth thickness measuring instrument comprises a shell, the measurement result display assembly is arranged at one end of the shell; the measuring assembly is arranged in the middle of the shell and is movably connected with the measuring result display assembly; and the measuring distance adjusting assembly is arranged at the other end of the shell. The measuring instrument comprises a measuring result display assembly, a measuring assembly and a measuring distance adjusting assembly, accurate adjustment of measuring distance can be achieved by operating the measuring distance adjusting assembly in the process of measuring the thickness of the buttress thread root through the measuring assembly, operation does not need to be conducted by means of the experience of an operator, and the measuring accuracy is improved. The accuracy of a measurement result and the precision of measurement result data are improved; and secondly, the three components of the measuring instrument are detachably connected with the shell, so that the measuring instrument is convenient for an operator to carry, has higher flexibility, and is higher in flexibility compared with a three-coordinate measuring machine, thereby being suitable for rapid detection of pipe threads in production and installation sites.

Description

Technical Field

[0001] The utility model belongs to the technical field of thread detection, and in particular relates to a thread thickness measuring instrument based on the measurement of the thread bottom of a partial trapezoidal thread. Background Art

[0002] Most of my country's oil resources are distributed in very complex and harsh geographical environments such as oceans, deserts, mountains, plateaus and swamps. Under such an environment, my country's oil extraction is becoming increasingly difficult, and the service conditions of oil pipes are becoming increasingly harsh, which puts higher requirements on the connection firmness of oil pipes.

[0003] In the production, use and maintenance of oil pipes, the threaded connection of the pipe is the weakest link in the pipe, and more than 80% of failure accidents occur at the threaded connection. Therefore, on the one hand, the threaded connection must have the structural integrity of the pipeline, that is, the threaded connection must have sufficient connection strength after meshing to avoid the structure being damaged under the action of external forces; on the other hand, the threaded connection must also have sealing properties, that is, the pipe body structure at the threaded connection can function for a long time without failure and leakage when subjected to internal and external pressure differences.

[0004] Therefore, in order to ensure that special oil pipeline products meet the needs of mining and transportation, in addition to exploring innovations in pipeline materials, processing technology, etc., innovations in thread detection means and methods are also an important part of preventing unqualified products from entering the mining and transportation links and preventing product failures from causing production accidents.

[0005] In the process of thread detection, in addition to the appearance detection of the thread (black buckle, broken teeth, burr and corrugation detection, etc.), thread tightening (torque, number of turns, position and J value, etc.), the design parameter detection of the thread is also an important part of the production and installation of oil pipes. The detection of the tooth thickness deviation of the trapezoidal thread is an important part of all the design parameter detection of the thread. It can determine whether the thread meets the design requirements after production and use wear. At present, the measurement methods of thread tooth thickness deviation are mainly divided into absolute measurement and relative measurement. The absolute measurement mainly adopts micrometer measurement and three-coordinate measurement. The micrometer is based on the operator's experience and is manually performed by the operator during the measurement process. In the adjustment of the measuring distance, due to the different work experience of each operator, the distance adjustment is prone to errors, resulting in uncertainty in the measuring position, making the measurement results more volatile. The three-coordinate measurement belongs to precision measurement. Since the three-coordinate measuring machine has high environmental requirements on the one hand and the measured length of the oil pipe is long on the other hand, it is not suitable for rapid detection of pipe threads at the production and installation site. Utility Model Content

[0006] The utility model provides a thread thickness measuring instrument based on the measurement of the thread bottom of a partial trapezoidal thread, which is used to solve the problems of large fluctuations and low accuracy of the measurement results using a micrometer in the prior art, and on the other hand, solves the technical defect that the existing three-dimensional coordinate measuring machine is not suitable for rapid detection of pipe threads at production and installation sites.

[0007] In order to achieve the purpose of the utility model, the utility model is implemented through the following technical solutions:

[0008] A thread thickness measuring instrument based on the measurement of the thread bottom of a partial trapezoidal thread, comprising:

[0009] case;

[0010] A measurement result display component is disposed on one end of the housing;

[0011] A measuring component, disposed in the middle of the housing and movably connected to the measuring result display component;

[0012] The measuring distance adjustment component is arranged on the other end of the shell.

[0013] Further, the measurement result display assembly includes a measuring instrument, which is arranged on one end of the housing and connected to the housing via a locking screw and an instrument locking block;

[0014] The measuring instrument is provided with an extension rod, one end of the extension rod is connected to the measuring instrument, and the other end of the extension rod is movably connected to the measuring component.

[0015] Further, the measuring assembly comprises a measuring force arm lever, a first fixed probe, a reset push rod and a second fixed probe, the measuring force arm lever is movably connected to the end of the extension rod, the end of the measuring force arm lever is connected to a rotating shaft, and a movable probe is provided at the bottom of the rotating shaft;

[0016] One end of the reset push rod is movably connected to the rotating shaft, and the other end is connected to the adjusting screw through an elastic member;

[0017] The first fixed probe and the second fixed probe are arranged at the bottom of the housing and are spaced apart from each other and are located on one side of the movable probe. A measuring distance adjustment component is connected to the top of the second fixed probe.

[0018] Furthermore, the measuring distance adjustment component comprises a fine-tuning nut, an outer side of the fine-tuning nut is connected to an adjusting rod, and a limiting pin is provided on the adjusting rod.

[0019] Furthermore, the first fixed probe, the movable probe and the second fixed probe are all cylindrical probes.

[0020] Furthermore, the extension rod is axially perpendicular to the measuring force arm lever.

[0021] Furthermore, the rotation axis and the reset push rod are axially perpendicular to each other.

[0022] Furthermore, the first fixed measuring head and the second fixed measuring head are vertically arranged at the bottom of the shell.

[0023] Furthermore, the measuring distance adjustment assembly also includes an adjusting rod bracket, and the adjusting rod bracket cooperates with the adjusting rod.

[0024] Furthermore, two adjusting rod brackets are provided, and the two adjusting rod brackets have the same structure and are arranged at intervals.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] 1. The measuring instrument includes a measurement result display component, a measuring component and a measuring distance adjustment component. When measuring the bottom tooth thickness of the eccentric trapezoidal thread by using the measuring component, the measuring distance adjustment component can be precisely adjusted without relying on the operator's experience, thereby improving the accuracy of the measurement result and the accuracy of the measurement result data; secondly, the measuring instrument consists of three components, and the three components are detachably connected to the shell, which is convenient for the operator to carry and has strong flexibility. Compared with a three-coordinate measuring machine, it has strong flexibility and is suitable for rapid detection of pipe threads at production and installation sites.

[0027] 2. The measuring instrument is connected to the housing through locking screws and instrument locking blocks, which ensures the stability of the measuring instrument, reduces shaking and deviation during the measurement process, and thus improves the accuracy of the measurement results; one end of the extension rod is connected to the measuring instrument, and the other end is movably connected to the measuring component, which increases the flexibility of the measurement.

[0028] 3. By connecting the measuring arm lever and the rotating shaft, the measuring assembly can sensitively respond to the contact between the movable probe and the measured thread root, thereby ensuring the accuracy of the measurement. The combination of the reset push rod and the elastic member allows the initial state of the measuring assembly or the size of the measuring force to be adjusted by adjusting the screw, which can adapt to the measurement of thread roots of different sizes or types, thereby improving the scope of application of the measuring instrument. The setting of the first fixed probe and the second fixed probe provides a stable reference point, while the movable probe can contact and displace the measured thread root, thereby performing accurate measurement. By connecting the measuring distance adjustment assembly to the second fixed probe, the distance between the measuring assembly and the measured thread root can be easily adjusted, so that the measuring instrument can adapt to the measurement of thread roots of different depths, thereby improving the flexibility and convenience of measurement.

[0029] 4. By rotating the fine-tuning nut, the distance between the measuring component and the bottom of the measured thread can be accurately controlled to ensure the accuracy of the measurement; the adjusting rod is connected to the fine-tuning nut, and the current measuring distance can be intuitively understood by observing the position of the adjusting rod, making the adjustment process more intuitive and easy to understand, reducing the difficulty of operation; the setting of the limit pin ensures the stability of the adjusting rod during the adjustment process, and by limiting the moving range of the adjusting rod, it prevents damage to the measuring component or inaccurate measurement caused by excessive adjustment, thereby improving the stability and reliability of the measurement.

[0030] 5. Cylindrical probes can provide more accurate and stable measurements due to their smooth surface and uniform contact points. When in contact with the bottom of the thread being measured, they can evenly transmit the measuring force and reduce the measurement error caused by uneven contact.

[0031] 6. The lever arm rotates counterclockwise around the connecting shaft. The horizontal displacement of the movable probe can accurately display the pointer offset through the cooperation between the lever arm and the extension rod.

[0032] 7. The axial vertical design enables the reset push rod to directly and accurately act on the rotating shaft when pushing the rotating shaft to reset, avoiding the problem of inaccurate or incomplete reset caused by the deviation of the force direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A first cross-sectional schematic diagram of a thread thickness measuring instrument based on the measurement of the thread bottom of a partial trapezoidal thread provided by the utility model;

[0035] Figure 2 A schematic diagram of a second cross-section of the thread thickness measuring instrument based on the measurement of the thread bottom of a partial trapezoidal thread provided by the utility model;

[0036] Figure 3 A schematic diagram of determining thread parameters in a thread thickness measuring instrument based on the measurement of the bottom of a partial trapezoidal thread provided by the utility model;

[0037] Among them: 1. Measuring instrument; 2. Locking screw; 3. Instrument locking block; 4. Extension rod; 5. Lever; 6. Rotating shaft; 7. Housing; 8. Fine-tuning nut; 9. Screw; 10. Adjustment rod bracket; 11. Adjustment rod; 12. Limit pin; 13. First fixed probe; 14. Movable probe; 15. Reset push rod; 16. Elastic part; 17. Adjustment screw; 18. Second fixed probe. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0041] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invented product is usually placed when in use, it is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0042] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0044] The present embodiment is described in detail below with reference to the accompanying drawings.

[0045] This embodiment provides a thread thickness measuring instrument based on the measurement of the thread root of a partial trapezoidal thread, comprising a housing 7; a measurement result display assembly, arranged at one end of the housing 7; a measurement assembly, arranged at the middle of the housing 7 and movably connected to the measurement result display assembly; and a measurement distance adjustment assembly, arranged at the other end of the housing 7. Figure 1-Figure 2As shown, the measuring instrument includes a measurement result display component, a measurement component and a measurement distance adjustment component. In the process of measuring the bottom thickness of the eccentric trapezoidal thread, the measurement distance adjustment component can be operated to achieve precise adjustment of the measurement distance, without relying on the operator's experience to operate, thereby improving the accuracy of the measurement result and the accuracy of the measurement result data; secondly, the measuring instrument is composed of three components, and the three components are detachably connected to the housing 7, which is convenient for the operator to carry and has strong flexibility. Compared with the three-coordinate measuring machine, it has strong flexibility and is suitable for rapid detection of pipe threads at production and installation sites. The measurement result display component includes a measuring instrument 1, which is arranged on one end of the housing 7 and is connected to the housing 7 by a locking screw 2 and an instrument locking block 3; an extension rod 4 is provided on the measuring instrument 1, one end of the extension rod 4 is connected to the measuring instrument 1, and the other end is movably connected to the measuring component. The measuring instrument 1 is connected to the housing 7 by means of the locking screw 2 and the instrument locking block 3, thereby ensuring the stability of the measuring instrument 1 and reducing shaking and deviation during the measurement process, thereby improving the accuracy of the measurement result; one end of the extension rod 4 is connected to the measuring instrument 1, and the other end is movably connected to the measuring component, thereby increasing the flexibility of the measurement. The measuring assembly includes a measuring force arm lever 5, a first fixed probe 13, a reset push rod 15 and a second fixed probe 18. The measuring force arm lever 5 is movably connected to the end of the extension rod 4, and the extension rod 4 and the measuring force arm lever 5 are axially perpendicular. The end of the measuring force arm lever 5 is connected to a rotating shaft 6, and a movable probe 14 is provided at the bottom of the rotating shaft 6; one end of the reset push rod 15 is movably connected to the rotating shaft 6, and the other end is connected to an adjusting screw 17 through an elastic member 16, and the rotating shaft 6 and the reset push rod 15 are axially perpendicular. The elastic member 16 is preferably a spring; the first fixed probe 13 and the second fixed probe 18 are arranged at the bottom of the housing 7, and are arranged at intervals, and are located on one side of the movable probe 14. The top of the second fixed probe 18 is connected to a measuring distance adjustment assembly, and the first fixed probe 13, the movable probe 14 and the second fixed probe 18 are all cylindrical probes. Through the connection between the measuring force arm lever 5 and the rotating shaft 6, the measuring assembly can sensitively respond to the contact between the movable probe 14 and the bottom of the measured thread, thereby ensuring the accuracy of the measurement. The combination of the reset push rod 15 and the elastic member 16 allows the initial state of the measuring assembly or the size of the measuring force to be adjusted by adjusting the screw 17, which can adapt to the measurement of thread roots of different sizes or types, thereby improving the scope of application of the measuring instrument. The setting of the first fixed probe 13 and the second fixed probe 18 provides a stable reference point, while the movable probe 14 can contact and displace the thread root to be measured, thereby performing accurate measurement. By connecting the measuring distance adjustment assembly to the second fixed probe 18, the distance between the measuring assembly and the thread root to be measured can be easily adjusted, so that the measuring instrument can adapt to the measurement of thread roots of different depths, thereby improving the flexibility and convenience of measurement.

[0046] In this embodiment, the measuring distance adjustment component includes a fine-tuning nut 8, an adjusting rod 11 is connected to the outer side of the fine-tuning nut 8, and a limit pin 12 is provided on the adjusting rod 11; the measuring distance adjustment component also includes an adjusting rod bracket 10, the adjusting rod bracket 10 cooperates with the adjusting rod 11, and there are two adjusting rod brackets 10, the two adjusting rod brackets 10 have the same structure and are arranged at intervals, and the two adjusting rod brackets 10 are fixed to the housing 7 by screws 9. During the specific operation, confirm the design parameters of the measured thread, such as Figure 3 As shown in the figure, the parameters include the measured thread tooth height H, the load-bearing surface tooth profile angle β, the guide surface tooth profile angle α, the thread top diameter taper half angle θ, and the distance h1 from the middle diameter line to the tooth bottom perpendicular to the thread axis; then, a tooth thickness standard template is designed and manufactured, the spherical measuring contact geometric dimensions R1 and R2 values ​​of the fixed probe and the movable probe are calculated, and the fixed probe and movable probe diameters and the probe handle structure are designed according to the R1 and R2 values.

[0047]

[0048]

[0049] The structure of the first fixed probe 13, the second fixed probe 18 and the movable probe 14 is designed. The first fixed probe 13, the second fixed probe 18 and the movable probe 14 adopt a cylindrical probe handle structure. The movable probe 14 is connected to the lever arm 5 by a thread and is located at the lower end of the measuring instrument. The upper end of the lever arm 5 contacts the instrument 1 through the extension rod 4 to achieve a pre-compression of the instrument 1 by 2-2.5mm. The first fixed probe 13 is connected to the housing 7 by a thread and is kept vertical at the lower end of the housing 7. The second fixed probe 18 is connected to the adjustment rod 11 by a thread, and is fixed to the lower end of the housing 7 by the adjustment rod bracket 10 through a screw 9 to keep it vertical, and a micro-adjustment is achieved through a fine-tuning nut 8. The locking block 3 and the adjusting screw 17 are fixed by the instrument to adjust the initial position of the movable probe 14. The initial position of the fixed contact 18 is determined by adjusting the threaded hole 11 on the measuring rod and the fine-tuning nut 8. Then, the thread thickness measuring instrument is zeroed using the thread standard thread thickness block. The thread thickness deviation of the measured thread is measured using the zeroed thread thickness measuring instrument. The instrument value is read to obtain the actual thread thickness deviation of the measured thread.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thread thickness measuring instrument based on the measurement of the thread bottom of a partial trapezoidal thread, characterized in that: include: Housing (7); A measurement result display component is arranged on one end of the housing (7); A measuring component, arranged in the middle of the housing (7) and movably connected to the measuring result display component; The measuring distance adjustment component is arranged on the other end of the housing (7).

2. The measuring instrument according to claim 1, characterized in that: The measurement result display assembly comprises a measuring instrument (1), wherein the measuring instrument (1) is arranged on one end of a housing (7) and connected to the housing (7) via a locking screw (2) and an instrument locking block (3); The measuring instrument (1) is provided with an extension rod (4), one end of the extension rod (4) is connected to the measuring instrument (1), and the other end is movably connected to the measuring component.

3. The measuring instrument according to claim 2, characterized in that: The measuring assembly comprises a measuring force arm lever (5), a first fixed probe (13), a reset push rod (15) and a second fixed probe (18); the measuring force arm lever (5) is movably connected to the end of the extension rod (4); the end of the measuring force arm lever (5) is connected to a rotating shaft (6); and a movable probe (14) is provided at the bottom of the rotating shaft (6); One end of the reset push rod (15) is movably connected to the rotating shaft (6), and the other end is connected to the adjusting screw (17) through an elastic member (16); The first fixed probe (13) and the second fixed probe (18) are arranged at the bottom of the housing (7) and are spaced apart and located on one side of the movable probe (14); the top of the second fixed probe (18) is connected to a measuring distance adjustment component.

4. The measuring instrument according to claim 3, characterized in that: The measuring distance adjustment component comprises a fine-tuning nut (8), the outer side of the fine-tuning nut (8) is connected to an adjustment rod (11), and a limit pin (12) is provided on the adjustment rod (11).

5. The measuring instrument according to claim 3, characterized in that: The first fixed probe (13), the movable probe (14) and the second fixed probe (18) are all cylindrical probes.

6. The measuring instrument according to claim 3, characterized in that: The extension rod (4) and the measuring force arm lever (5) are axially perpendicular to each other.

7. The measuring instrument according to claim 3, characterized in that: The rotating shaft (6) and the reset push rod (15) are axially perpendicular to each other.

8. The measuring instrument according to claim 3, characterized in that: The first fixed measuring head (13) and the second fixed measuring head (18) are vertically arranged at the bottom of the housing (7).

9. The measuring instrument according to claim 4, characterized in that: The measuring distance adjustment assembly further comprises an adjustment rod bracket (10), and the adjustment rod bracket (10) cooperates with the adjustment rod (11).

10. The measuring instrument according to claim 9, characterized in that: Two adjusting rod brackets (10) are provided, and the two adjusting rod brackets (10) have the same structure and are arranged at intervals.

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