A device for measuring the major diameter of a tool joint

Abstract

The application discloses a device for measuring the large-end diameter of a drill tool external thread joint, and relates to the technical field of oil drilling. An operator only needs to operate the first clamping arm and the second clamping arm of the clamp body, and the first probe and the second probe can be quickly clamped on both sides of the large end of the drill tool external thread joint, so that the large-end diameter of the external thread joint can be measured by the distance detection sensor, the measurement time is shortened, and the measurement efficiency is improved. The display directly displays the large-end diameter measured by the distance detection sensor, and the accuracy of obtaining the large-end diameter is improved. Due to the design of the elastic component and the hinged structure of the clamp body, whether the drill tool external thread joint is large or small in diameter, the clamp body can be clamped by adjusting the position of the clamping arm and the elastic deformation of the elastic component, the application range is expanded, and the accuracy, efficiency and wide application range of determining the drill tool thread type based on the large-end diameter are ensured.

Description

Technical Field

[0001] This application relates to the field of oil drilling technology, and in particular to a measuring device for the large end diameter of an external threaded joint of a drill bit. Background Technology

[0002] Different thread types of drill bits have different dimensions. Incorrect thread type matching may cause the drill bit to not fit tightly during connection, resulting in loosening or slippage. This may cause the drill bit to suddenly break or separate when subjected to tension, torque and pressure during drilling, leading to serious downhole accidents. This will not only cause huge economic losses, but may also endanger the lives of personnel on site.

[0003] Currently, the main methods for determining the thread type of drill bits include manual visual inspection, thread comparison gauge measurement, and vernier caliper measurement. Manual visual inspection relies on operator experience and has an error rate as high as 12%, easily leading to misjudgments due to lighting and angle issues. Thread comparison gauges only cover a limited range of thread specifications, limiting their applicability. Using vernier calipers to manually measure relevant data of the drill bit threads (such as the large end diameter of the external thread) and then comparing it with a standard table to determine the thread type requires high cleanliness. Oil and metal shavings mixed into the sliding parts of the calipers can cause them to slide unevenly or even jam, preventing proper adjustment of the measuring jaws and affecting measurement efficiency and accuracy. Vernier caliper readings require reading both the main scale and the vernier scale, demanding a certain level of reading ability from the operator; inexperienced operators are prone to misreading, and readings are also easily made in poor lighting or unclear scale conditions. Therefore, none of the above methods of measuring drill bit thread type can simultaneously achieve accuracy, high efficiency, and a wide range of applicability.

[0004] Therefore, how to ensure that the determination of the drill bit thread type can take into account accuracy, efficiency and wide applicability is a problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide a measuring device for the large end diameter of the external threaded joint of a drill bit, in order to solve the problem that current drill bit thread type measurements cannot simultaneously achieve accuracy, high efficiency, and wide applicability.

[0006] To solve the above-mentioned technical problems, this application provides a measuring device for the large end diameter of the external threaded joint of a drill bit, comprising: a clamp body, a probe, an elastic component, a distance detection sensor, and a display;

[0007] The clamp body includes a first clamping arm and a second clamping arm, with the middle portions of the first clamping arm and the second clamping arm hinged together. The probe includes a first probe and a second probe, with the first probe located at the head of the first clamping arm and the second probe located at the head of the second clamping arm. The two ends of the elastic member are respectively connected to the first clamping arm and the second clamping arm. The distance detection sensor is mounted on the clamp body and is used to detect the distance between the first probe and the second probe when they abut against both sides of the large end of the external threaded joint of the drill bit. The display is connected to the distance detection sensor and is used to display the distance.

[0008] Based on the above embodiments, in one feasible embodiment, both the first clamping arm and the second clamping arm include a first straight arm, a first arc-shaped transition portion, a connecting arm, a second arc-shaped transition portion, and a second straight arm that are smoothly connected in sequence. The arc of the first arc-shaped transition portion and the second arc-shaped transition portion is an obtuse angle. The middle part of the connecting arm of the first clamping arm is hinged to the middle part of the connecting arm of the second clamping arm. The first probe is located at the head of the first straight arm of the first clamping arm, and the second probe is located at the head of the first straight arm of the second clamping arm.

[0009] Based on the above embodiments, in one feasible embodiment, the second straight arm of the first clamping arm is connected to a first handle, and the second straight arm of the second clamping arm is connected to a second handle. The first handle is a ring handle, and the second handle is an arc handle. The surfaces of the ring handle and the arc handle are both covered with an anti-slip layer and an anti-static layer.

[0010] Based on the above embodiments, in one feasible embodiment, the heads of the first clamping arm and the second clamping arm are both provided with magnetic slots. The probe includes a contact, a limiting block and a magnetic plug. The contact and the magnetic plug are respectively connected to both sides of the limiting block, and the magnetic plug is inserted into the magnetic slot.

[0011] Based on the above embodiments, in one feasible embodiment, the surface of the contact is a plane that fits with the stepped surface of the large end of the external threaded connector, and the end of the contact is an arc-shaped portion that matches the side of the large end of the external threaded connector. The arc-shaped portion of the first probe is oriented opposite to the arc-shaped portion of the second probe.

[0012] Based on the above embodiments, in one feasible embodiment, the display includes a housing, an integrated circuit board, and a display screen connected to the integrated circuit board. The integrated circuit board is disposed inside the housing, the display screen is disposed on the front of the housing, and a locking hole is provided on the back of the housing. A pin hole is provided in the middle of the first clamping arm and the second clamping arm. A bushing is sleeved in the pin hole, and a locking pin passes through the bushing and is inserted into the locking hole to install the display at the hinge of the first clamping arm and the second clamping arm.

[0013] Based on the above embodiments, in one feasible embodiment, the distance detection sensor is a capacitive grating sensor, which includes a main grating and a sub-grating. The main grating is mounted on the integrated circuit board and located inside the housing. The main grating has a through hole in the middle for the locking pin to pass through. The sub-grating is disposed on the first clamping arm or the second clamping arm. The back of the housing has an arc-shaped contact hole, and the sub-grating abuts against the main grating through the arc-shaped contact hole.

[0014] Based on the above embodiments, in one feasible embodiment, the side wall of the locking pin is provided with a spring block, and the inside of the locking hole is provided with a groove that matches the spring block.

[0015] Based on the above embodiments, in one feasible embodiment, the back of the box is further provided with a card slot for storing the probe.

[0016] Based on the above embodiments, in one feasible embodiment, the display further includes an audible and visual alarm device and a button connected to the integrated circuit board, both of which are located on the front of the housing.

[0017] This application provides a measuring device for the large end diameter of a drill string's external threaded connector. Under the action of an elastic component, the first and second clamping arms quickly clamp the large end of the connector. The distance between the first and second clamping arms and the distance sensor detects is the large end diameter of the external threaded connector. Compared to traditional methods using thread comparator rulers or vernier calipers, this eliminates the need for complex preparatory work such as ruler selection, caliper cleaning, and adjustment. The operator only needs to clamp the device body on both sides of the large end of the external threaded connector, and the distance sensor can measure the large end diameter, significantly shortening the time required for measurement. The measurement time is reduced, improving measurement efficiency. Furthermore, the display shows the large-end diameter measured by the distance detection sensor, unaffected by factors such as light, scale clarity, or the operator's reading ability, thus improving the accuracy of large-end diameter acquisition. Due to the design of the elastic components and hinge structure of the clamp body, the first and second clamping arms can be adaptively adjusted according to the large-end diameter of the drill string's external thread joint. Whether the drill string's external thread joint has a large or small diameter, it can be clamped and measured by adjusting the position of the clamping arms and the elastic deformation of the elastic components. This solves the problem that thread comparison rulers only cover a portion of thread specifications, expanding the scope of application. In summary, based on the high accuracy, high efficiency, and wide applicability of large-end diameter measurement, the accuracy, efficiency, and broad applicability of determining the drill string thread type based on the large-end diameter can be guaranteed. Attached Figure Description

[0018] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A structural diagram of a measuring device for measuring the large end diameter of an external threaded joint of a drill bit, provided in an embodiment of this application;

[0020] Figure 2 A schematic diagram of a measuring device clamping the large end of an external threaded connector of a drill bit, provided as an embodiment of this application;

[0021] Figure 3 A schematic diagram of a clamp body provided in an embodiment of this application;

[0022] Figure 4 A schematic diagram of a clamping arm provided for an embodiment of this application;

[0023] Figure 5 A schematic diagram of a probe provided for an embodiment of this application;

[0024] Figure 6A schematic diagram of an embodiment of this application, including a display and a clamp body;

[0025] Figure 7 An exploded view of a display provided in an embodiment of this application;

[0026] Figure 8 A front view of the first type of display provided in an embodiment of this application;

[0027] Figure 9 This is a front view of a second type of display provided in an embodiment of this application.

[0028] The reference numerals in the attached figures are as follows: 1-First clamping arm, 2-Second clamping arm, 3-First probe, 4-Second probe, 5-Elastic component, 6-Display, 7-Step surface, 8-First straight arm, 9-First arc-shaped transition part, 10-Connecting arm, 11-Second arc-shaped transition part, 12-Second straight arm, 13-Annular handle, 14-Arc-shaped handle, 15-Magnetic slot, 16-Contact, 17-Limiting block, 18-Magnetic plug, 19-Pin hole, 20-Sleeve, 21-Main grid, 22-Sub-grid, 601-Box body, 602-Integrated circuit board, 603-Display screen, 604-Locking pin, 605-Button, 606-Indicator light, 607-Buzzer, 6011-Locking hole, 6012-Arc-shaped contact hole, 6013-Slot. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0030] The core of this application is to provide a measuring device for the large end diameter of the external threaded joint of a drill bit, which can ensure that the determination of the drill bit thread type can take into account accuracy, efficiency and a wide range of applications.

[0031] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Figure 1 This application provides a structural diagram of a device for measuring the large end diameter of a drill bit's external threaded connector, as an embodiment of the present application. Figure 2 This is a schematic diagram of a measuring device clamping the large end of a drill bit's external threaded connector, provided in an embodiment of this application. Figure 1 and Figure 2As shown, the measuring device for the large end diameter of the external threaded joint of the drill bit includes: a clamp body, a probe, an elastic component 5, a distance detection sensor, and a display 6; the clamp body includes a first clamping arm 1 and a second clamping arm 2, with the middle of the first clamping arm 1 and the middle of the second clamping arm 2 hinged together; the probe includes a first probe 3 and a second probe 4, with the first probe 3 located at the head of the first clamping arm 1 and the second probe 4 located at the head of the second clamping arm 2; the two ends of the elastic component 5 are respectively connected to the first clamping arm 1 and the second clamping arm 2; the distance detection sensor is mounted on the clamp body and is used to detect the distance between the first probe 3 and the second probe 4 when they abut against both sides of the large end of the external threaded joint of the drill bit; the display 6 is connected to the distance detection sensor and is used to display the distance.

[0033] The large end of an external threaded connector refers to the end of the drill bit with the larger diameter of the external threaded connector, as opposed to the small end. The large end diameter is one of the important parameters for distinguishing different thread types. The uniqueness of the large end diameter: Different specifications of thread types have a unique large end diameter, possessing a unique correspondence. For example, in API standard threads, the large end diameter of the NC50 thread type is 133.3 mm, and the large end diameter of the NC46 thread type is 101.6 mm. By utilizing the uniqueness of the large end diameter, the measured large end diameter can be directly matched with a preset thread type database to accurately identify the thread type.

[0034] This application embodiment does not specifically limit the shape and specifications of the first clamping arm 1 and the second clamping arm 2 of the clamp body. The middle part of the first clamping arm 1 and the middle part of the second clamping arm 2 are hinged to form a scissor-type opening and closing structure. This hinge structure allows the clamp to open and close flexibly, making it convenient to abut the first probe 3 and the second probe 4 against both sides of the large end of the drill string's external threaded connector. It can adapt to drill string connectors of different sizes and shapes, and has good versatility and operability. The elastic component 5 can be a helical spring with an elastic coefficient k=50N / m, so that the single-handed operating force is ≤10N. When the elastic component 5 is not under force, the first probe 3 at the head of the first clamping arm 1 and the second probe 4 at the head of the second clamping arm 2 maintain an initial distance. When the operator separates the two clamping arms to place the drill string's external threaded connector, the elastic component 5 can automatically generate a pulling force or elastic force, causing the clamping arms to return to the initial position after the measurement is completed, which is convenient for the next measurement. At the same time, it also ensures an appropriate clamping force during the measurement process, so that the probe can stably contact both sides of the large end of the drill string's external threaded connector. This application does not specifically limit the manner in which the first probe 3 and the second probe 4 are respectively mounted on the first clamping arm 1 and the second clamping arm 2. The first probe 3 and the second probe 4 are used to abut against both sides of the large end of the external threaded joint of the drill bit. Since the distance detection sensor is located on the clamp body, in order for the distance detection sensor to directly measure the distance between the first probe 3 and the second probe 4, a calibrated distance detection sensor can be used. The specific calibration method is as follows: using a standard block of known length as a reference, the two probes are placed at both ends of the standard block, and the output value of the distance detection sensor is recorded. Then, the standard block of different lengths is replaced, and the above steps are repeated multiple times to establish the correspondence between the sensor output value and the known distance, thereby completing the calibration. This calibration method is prior art and will not be described in detail here. This application does not specifically limit the type of distance detection sensor, which can be an optical distance sensor, an ultrasonic distance sensor, or a capacitive distance sensor, etc. The display 6 is used to show the distance between the first probe 3 and the second probe 4 detected by the displacement detection sensor when they abut against the two sides of the large end of the external threaded joint of the drill bit. This distance is the large end diameter of the external threaded joint of the drill bit. The display 6 makes it easy for the operator to quickly read the measurement results so that they can refer to the standard table to determine the thread type of the external threaded joint based on the large end diameter.

[0035] like Figure 2 As shown, when the first probe 3 and the second probe 4 abut against both sides of the large end of the external threaded joint of the drill bit, the elastic component 5 is in a stretched state. The elastic component 5 can provide a uniform clamping force, so that the probe can stably fit against both sides of the large end of the external threaded joint of the drill bit, thereby reducing measurement error.

[0036] This application provides a device for measuring the large end diameter of a drill string's external threaded connector. Under the action of an elastic component 5, the first clamping arm 1 and the second clamping arm 2, along with the first probe 3 and the second probe 4, quickly clamp the large end of the drill string's external threaded connector. The distance between the first probe 3 and the second probe 4, detected by a distance sensor, is the large end diameter of the external threaded connector. Compared to traditional methods using a thread comparator or vernier caliper, this eliminates the need for complex preparatory work such as selecting a ruler, cleaning and adjusting the caliper. The operator only needs to clamp the clamp body on both sides of the large end of the drill string's external threaded connector, and the distance sensor can measure the large end diameter, significantly reducing the time required for measurement. The measurement time is shortened, improving measurement efficiency. Furthermore, the display 6 shows the large-end diameter measured by the distance detection sensor, unaffected by factors such as light, scale clarity, or the operator's reading ability, thus improving the accuracy of large-end diameter acquisition. Due to the design of the elastic component 5 and hinge structure of the clamp body, the first clamping arm 1 and the second clamping arm 2 can be adaptively adjusted according to the large-end diameter of the drill string's external thread joint. Whether the drill string's external thread joint has a large or small diameter, it can be clamped and measured by adjusting the position of the clamping arms and the elastic deformation of the elastic component 5. This solves the problem that thread comparison rulers only cover a portion of thread specifications, expanding the scope of application. In summary, based on the high accuracy, high efficiency, and wide applicability of large-end diameter measurement, the accuracy, efficiency, and wide applicability of determining the drill string thread type based on the large-end diameter can be guaranteed.

[0037] Based on the above embodiments, Figure 3 This is a schematic diagram of a clamp body provided in an embodiment of this application. Figure 4 This is a schematic diagram of a clamping arm provided in an embodiment of this application, as shown below. Figure 3 and Figure 4 As shown, in this embodiment of the application, both the first clamping arm 1 and the second clamping arm 2 include a first straight arm 8, a first arc-shaped transition portion 9, a connecting arm 10, a second arc-shaped transition portion 11, and a second straight arm 12, which are smoothly connected in sequence. The arc of the first arc-shaped transition portion 9 and the second arc-shaped transition portion 11 is an obtuse angle. The middle part of the connecting arm 10 of the first clamping arm 1 is hinged to the middle part of the connecting arm 10 of the second clamping arm 2. The first probe 3 is disposed at the head of the first straight arm 8 of the first clamping arm 1, and the second probe 4 is disposed at the head of the first straight arm 8 of the second clamping arm 2. Figure 3 and Figure 4 As shown, the arc opening of the first arc-shaped transition portion 9 on each clamping arm faces opposite directions to the arc opening of the second arc-shaped transition portion 11. The first probe 3 is perpendicular to the first straight arm 8, and the second probe 4 is perpendicular to the second straight arm 12. The heads of the first probe 3 and the second probe 4 are positioned opposite each other. The surfaces of the first clamping arm 1 and the second clamping arm 2 are anodized to enhance corrosion resistance and insulation performance.

[0038] Furthermore, the second straight arm 12 of the first clamping arm 1 is connected to a first handle, and the second straight arm 12 of the second clamping arm 2 is connected to a second handle. The first handle is a ring handle 13, and the second handle is an arc-shaped handle 14. Both the ring handle 13 and the arc-shaped handle 14 are covered with an anti-slip layer and an anti-static layer. The ring handle 13 has a through hole in the middle for fingers to pass through, and the arc of the arc-shaped handle 14 faces the ring handle 13.

[0039] In this embodiment, the second straight arm 12 of the first clamping arm 1 is constructed to give the clamp body a streamlined "frog jumping" shape, with the center of gravity shifted rearward to improve operational stability. The streamlined back of the frog and the curved design of the handle conform to the natural curvature of the palm, providing a comfortable grip and reducing hand fatigue during prolonged operation. The scissor-type spring opening and closing structure (similar to the jumping mechanism of a frog's hind legs) allows for single-handed operation, with uniform opening and closing force that conforms to human hand application habits, making operation convenient. The design mimicking the frog jumping posture shifts the center of gravity rearward, improving the stability of the measuring device during measurement and avoiding errors caused by shaking. In addition, the surfaces of the ring handle 13 and the curved handle 14 are covered with anti-slip material (friction coefficient μ≥0.8) and integrated with an anti-static copper wire braided layer, providing good grip and eliminating the hazards of static electricity. The curved handle 14 and the ring handle 13 are easy to adapt to different hand shapes.

[0040] Based on the above embodiments, Figure 5 This is a schematic diagram of a probe provided in an embodiment of this application, as shown below. Figure 4 and Figure 5 As shown, the heads of the first clamping arm 1 and the second clamping arm 2 are both provided with magnetic slots 15. The probe includes a contact 16, a limiting block 17 and a magnetic plug 18. The contact 16 and the magnetic plug 18 are respectively connected to the two sides of the limiting block 17, and the magnetic plug 18 is inserted into the magnetic slot 15.

[0041] In this embodiment, the diameter of the limiting block 17 is larger than the inner diameter of the magnetic slot 15. The magnetic plug 18 can be made of neodymium iron boron magnet (magnetic force ≥12N), which can be quickly attracted and separated from the magnetic slot 15, making it easy to replace the probe.

[0042] Based on the above embodiments, in this application embodiment, the surface of the contact 16 is a plane that fits with the stepped surface 7 of the large end of the external threaded connector, and the end of the contact 16 is an arc-shaped part that matches the side of the large end of the external threaded connector. The arc-shaped part of the first probe 3 is oriented opposite to the arc-shaped part of the second probe 4.

[0043] In this embodiment, the contact 16 is flat and 2mm thick, ensuring that its surface fits snugly against the stepped surface 7 of the large end of the external threaded connector. The head of the contact 16 is machined into an arc shape to match the arc surface of the external threaded connector. The probe and the clamping arm are detachably connected, allowing for the selection of a probe that matches the arc surface of the external threaded connector, so that the arc part of the probe can better fit against the side of the external threaded connector, thereby improving the accuracy of the large end diameter measurement.

[0044] Based on the above embodiments, Figure 6 This is a schematic diagram illustrating an embodiment of the present application that includes a display and a fixture body. Figure 7 An exploded view of a display provided in an embodiment of this application, such as... Figure 6 and Figure 7 As shown, the display 6 in this embodiment includes a housing 601, an integrated circuit board 602, and a display screen 603 connected to the integrated circuit board 602. The integrated circuit board 602 is disposed inside the housing 601, and the display screen 603 is disposed on the front of the housing 601. The back of the housing 601 is provided with a locking hole 6011. The middle part of the first clamping arm 1 and the second clamping arm 2 is provided with a pin hole 19. A bushing 20 is sleeved inside the pin hole 19. A locking pin 604 passes through the bushing 20 and is inserted into the locking hole 6011 to install the display 6 at the hinge of the first clamping arm and the second clamping arm 2.

[0045] In this embodiment, the display 6 supports IP67 protection and can operate in rainy or foggy environments. The integrated circuit board 602 includes a processing unit that stores a thread type database. The database is updatable and contains a correspondence between the large end diameter and the thread type. The processing unit has data processing capabilities and can quickly query and match the thread type in the database based on the large end diameter detected by the distance sensor. The thread type is then displayed on the display screen 603. Based on this, there is no need to manually consult a standard table containing the correspondence between the large end diameter and the thread type, further improving the accuracy and efficiency of thread type identification.

[0046] Based on the above embodiments, the distance detection sensor in this application embodiment is a capacitive grating sensor. The capacitive grating sensor includes a main grating 21 and a secondary grating 22. The main grating 21 is mounted on an integrated circuit board 602 and located inside a housing 601. The main grating 21 has a through hole in the middle for the locking pin 604 to pass through. The secondary grating 22 is disposed on a first clamping arm 1 or a second clamping arm 2. The back of the housing 601 has an arc-shaped contact hole 6012, and the secondary grating 22 abuts against the main grating 21 through the arc-shaped contact hole 6012.

[0047] The processing unit on the integrated circuit board 602 automatically matches the thread type database based on the detection signal output by the capacitive grating sensor, and the display screen 603 displays the measured value (such as the large end diameter Φ133.3mm) and the matching result (such as "NC50") in real time.

[0048] In this embodiment, the main gate 21 is fixed to the integrated circuit board 602 with conductive adhesive to ensure direct conductivity with the circuit traces on the integrated circuit board 602. The main gate 21, mounted on the integrated circuit board 602 and located within the housing 601, serves as a static electrode. The secondary gate 22, located on the first clamping arm 1 or the second clamping arm 2, serves as a movable electrode. It moves relative to the main gate 21 as the clamping arms open and close, changing the capacitance between them to reflect changes in distance. The dynamic capacitance signal of the secondary gate 22 forms a closed loop with the main gate 21 through the contact grooves of the main and secondary gates 22, and the signal is ultimately transmitted to the integrated circuit board 602. The main gate 21 has a through hole in its center for the locking pin 604 to pass through. This design facilitates precise positioning and fixing of the main gate 21 to the integrated circuit board 602 during assembly using the locking pin 604, ensuring the stability of the main gate 21 within the housing 601 and preventing displacement or shaking, thereby guaranteeing measurement accuracy and reliability. The secondary grid 22 is mounted on either the first clamping arm 1 or the second clamping arm 2. An arc-shaped contact hole 6012 is provided on the back of the housing 601. The secondary grid 22 abuts against the main grid 21 through the arc-shaped contact hole 6012. This contact method ensures that the secondary grid 22 maintains good contact with the main grid 21 throughout the movement of the clamping arm, guaranteeing the continuity and accuracy of capacitance changes even during the swinging of the clamping arm. The arc-shaped contact hole 6012 is designed to accommodate the movement trajectory of the secondary grid 22, allowing it to move freely within a certain range and maintain stable contact with the main grid 21, thus improving measurement accuracy and stability. The capacitive grating sensor measures distance based on the principle of capacitance change. When the secondary grid 22 moves relative to the main grid 21 with the opening and closing of the clamping arm, the capacitance between them changes. By detecting this capacitance change, the distance between the first probe 3 and the second probe 4 can be determined, which is the diameter of the large end of the drill bit's external thread connector. Specifically, the main grid 21 and the secondary grid 22 constitute the two electrodes of the capacitive grating sensor. As the secondary grid 22 rotates, the relative position between the primary grid 21 and the secondary grid 22 changes, resulting in a change in capacitance. This change in capacitance is the basis for measuring angular displacement θ. There is a certain mathematical relationship between the change in capacitance and the angular displacement θ. By detecting the change in capacitance, the magnitude of the angular displacement θ can be indirectly measured. When the first clamping arm 1 and the second clamping arm 2 open and close around the hinge point, the secondary grid 22 will make a circular motion around the primary grid 21, generating an angular displacement θ. The magnitude of the angular displacement θ is related to the distance between the first probe 3 and the second probe 4. Therefore, the large end diameter of the external threaded joint can be detected using a capacitive grid sensor.

[0049] This application employs a capacitive grating sensor, which boasts high measurement accuracy, achieving micron-level resolution to meet the requirements for precise measurement of the large end diameter of the external threaded joint of the drill bit. Furthermore, since its working principle is primarily based on capacitance changes, it exhibits relatively low sensitivity to electromagnetic interference, demonstrating good anti-interference capabilities and enabling stable operation under certain levels of electromagnetic interference.

[0050] Based on the above embodiments, the side wall of the locking pin 604 in this application is provided with a spring block, and the inside of the locking hole 6011 is provided with a groove that matches the spring block. The spring block and the groove cooperate with each other. When the locking pin 604 is inserted into the locking hole 6011, the spring block is engaged in the groove, which can accurately position and fix the position of the locking pin 604, so that the locking pin 604 cannot easily move axially or rotate, thereby stably fixing the display 6 on the fixture body, and also ensuring that the main grid 21 is stable in position during operation and will not be displaced or shaken. The design of the spring block and the groove makes the disassembly and assembly of the locking pin 604 more convenient and quick; when the main grid 21 needs to be disassembled for maintenance, replacement or adjustment, only a certain force needs to be applied to compress the spring block, and the locking pin 604 can be pulled out from the locking hole 6011; when installing, the locking pin 604 is aligned with the locking hole 6011 and inserted, and the spring block automatically engages in the groove under the action of elasticity, completing the locking, without complicated tools and operation steps.

[0051] Based on the above embodiments, the back of the housing 601 in this application embodiment is further provided with a slot 6013 for storing the probe. When the measuring device needs to be carried or transported, storing the probe in the slot 6013 can keep the entire device compact and intact, prevent the probe from being separated from other components, and facilitate the carrying and transportation of the device; the presence of the slot 6013 provides the probe with a clear storage location, making it convenient for operators to put the probe back in its original position after use and avoid losing the probe.

[0052] Based on the above embodiments, Figure 8 This is a front view of the first type of display 6 provided in the embodiments of this application. Figure 9 This is a front view of the second type of display 6 provided in the embodiments of this application, as shown in the figure. Figure 8 and Figure 9 As shown, the display 6 also includes an audible and visual alarm device and a button 605 connected to the integrated circuit board 602. Both the audible and visual alarm device and the button 605 are located on the front of the housing 601. The audible and visual alarm device includes an indicator light 606 and a buzzer 607.

[0053] In this embodiment, button 605 can be used to control the start, stop, and pause operations of the measuring device. During measurement, the operator can use button 605 to control the start and end of the measurement process, facilitating convenient and flexible measurement operations. When the integrated circuit board 602 receives the large end diameter detected by the distance detection sensor, it compares it with its built-in thread type database. If a matching thread type corresponding to the large end diameter is successfully found, a green light illuminates continuously along with a short beep; if the matching fails, a red light flashes and a long beep occurs.

[0054] The foregoing has provided a detailed description of a measuring device for the large end diameter of a drill bit external threaded connector. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims.

[0055] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A measuring device for the large end diameter of a drill bit external threaded joint, characterized in that, include: The fixture body, probe, elastic component (5), distance detection sensor and display (6); The clamp body includes a first clamping arm (1) and a second clamping arm (2), the middle part of the first clamping arm (1) and the middle part of the second clamping arm (2) are hinged together. The probe includes a first probe (3) and a second probe (4), the first probe (3) is located at the head of the first clamping arm (1), and the second probe (4) is located at the head of the second clamping arm (2). The two ends of the elastic member (5) are respectively connected to the first clamping arm (1) and the second clamping arm (2). The distance detection sensor is assembled on the clamp body and is used to detect the distance between the first probe (3) and the second probe (4) when the first probe (3) and the second probe (4) abut against both sides of the large end of the external threaded joint of the drill bit. The display (6) is connected to the distance detection sensor and is used to display the distance.

2. The measuring device for the large end diameter of the external threaded joint of the drill bit according to claim 1, characterized in that, Both the first clamping arm (1) and the second clamping arm (2) include a first straight arm (8), a first arc-shaped transition part (9), a connecting arm (10), a second arc-shaped transition part (11), and a second straight arm (12) that are smoothly connected in sequence. The arc of the first arc-shaped transition part (9) and the second arc-shaped transition part (11) is an obtuse angle. The middle part of the connecting arm (10) of the first clamping arm (1) is hinged to the middle part of the connecting arm (10) of the second clamping arm (2). The first probe (3) is located at the head of the first straight arm (8) of the first clamping arm (1), and the second probe (4) is located at the head of the first straight arm (8) of the second clamping arm (2).

3. The measuring device for the large end diameter of the external threaded joint of the drill bit according to claim 2, characterized in that, The second straight arm (12) of the first clamping arm (1) is connected to a first handle, and the second straight arm (12) of the second clamping arm (2) is connected to a second handle. The first handle is a ring handle (13), and the second handle is an arc handle (14). The surfaces of the ring handle (13) and the arc handle (14) are covered with an anti-slip layer and an anti-static layer.

4. The measuring device for the large end diameter of the external threaded joint of the drill bit according to claim 1, characterized in that, The heads of the first clamping arm (1) and the second clamping arm (2) are provided with magnetic slots (15). The probe includes a contact (16), a limiting block (17) and a magnetic plug (18). The contact (16) and the magnetic plug (18) are respectively connected to both sides of the limiting block (17), and the magnetic plug (18) is inserted into the magnetic slot (15).

5. The measuring device for the large end diameter of the external threaded joint of the drill bit according to claim 4, characterized in that, The surface of the contact (16) is a plane that fits with the stepped surface (7) of the large end of the external threaded connector. The end of the contact (16) is an arc-shaped part that matches the side of the large end of the external threaded connector. The arc-shaped part of the first probe (3) is oriented opposite to the arc-shaped part of the second probe (4).

6. The measuring device for the large end diameter of the external threaded joint of the drill bit according to claim 1, characterized in that, The display (6) includes a housing (601), an integrated circuit board (602), and a display screen (603) connected to the integrated circuit board (602). The integrated circuit board (602) is located inside the housing (601), and the display screen (603) is located on the front of the housing (601). The back of the housing (601) is provided with a locking hole (6011). The middle part of the first clamping arm (1) and the second clamping arm (2) is provided with a pin hole (19). A bushing (20) is sleeved inside the pin hole (19). A locking pin (604) passes through the bushing (20) and is inserted into the locking hole (6011) to install the display (6) at the hinge of the first clamping arm (1) and the second clamping arm (2).

7. The measuring device for the large end diameter of the external threaded joint of the drill bit according to claim 6, characterized in that, The distance detection sensor is a capacitive grating sensor, which includes a main grating (21) and a sub-grating (22). The main grating (21) is mounted on the integrated circuit board (602) and located inside the housing (601). The main grating (21) has a through hole in the middle for the locking pin (604) to pass through. The sub-grating (22) is located on the first clamping arm (1) or the second clamping arm (2). The back of the housing (601) has an arc-shaped contact hole (6012). The sub-grating (22) abuts against the main grating (21) through the arc-shaped contact hole (6012).

8. The measuring device for the large end diameter of the external threaded joint of the drill bit according to claim 6, characterized in that, The side wall of the locking pin (604) is provided with a spring block, and the inside of the locking hole (6011) is provided with a groove that matches the spring block.

9. The measuring device for the large end diameter of the external threaded joint of the drill bit according to claim 6, characterized in that, The back of the box (601) is also provided with a card slot (6013), which is used to store the probe.

10. The measuring device for the large end diameter of the external threaded joint of a drill bit according to any one of claims 6 to 9, characterized in that, The display (6) also includes an audible and visual alarm device and a button (605) connected to the integrated circuit board (602), and the audible and visual alarm device and the button (605) are both located on the front of the housing (601).

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