Alignment method and alignment device for lathe chuck

Abstract

The invention discloses a lathe chuck alignment method, which comprises the following steps: S1, when each clamping jaw of a lathe chuck rotates to be axially opposite to a distance detection unit, arranging a plurality of detection points which are axially opposite to all clamping jaws one by one on a to-be-detected surface of a drill rod; s2, acquiring actual radial distances of all detection points fed back by the distance detection unit; s3, whether the actual radial distance corresponding to any two detection points oppositely arranged in the radial direction meets a preset corresponding relation or not is judged; if yes, judging that the product is qualified; and if not, the clamping jaw adjusting unit is controlled to adjust the positions of the two clamping jaws corresponding to the two detection points oppositely arranged in the radial direction in the radial direction, and the step S2 is executed again till the deviation between the central axis of the drill rod and the central axis of the lathe chuck is within the set deviation range. The radial position of the corresponding clamping jaw of the lathe chuck is automatically adjusted according to the actual radial distance of each detection point of the to-be-detected face of the drill rod, and the repairing efficiency and the repairing precision are both high.

Description

Technical Field

[0001] This invention relates to the field of rotary parts machining technology, and in particular to a lathe chuck alignment method and alignment device. Background Technology

[0002] Oil drilling projects require a large number of drill pipes for drilling. Drill pipes are steel pipes with threads at both ends, connected to the drilling rig drive and the drill bit at the bottom of the well via tapered threads, used to transport drilling mud to the drill bit. Because drill pipes are subjected to very strong alternating loads and high temperatures during drilling, coupled with the scouring and friction of high-pressure drilling mud, the shoulder surface and thread profile of the drill pipe are easily worn and deformed, even resulting in localized damage. To prevent drill pipes from becoming unusable, they need to be processed and repaired to improve their reusability and extend their actual service life.

[0003] Pipe threading lathes, as important equipment for drill pipe thread repair, are characterized by high machining accuracy, high machining efficiency, and good stability. When threading is required, the spindle chuck of the pipe threading lathe first clamps the drill pipe and rotates it. After the X-axis coordinate position of the tool post is adjusted, the tool post is then controlled to move along the Z-axis, thus cutting the desired thread on the drill pipe. To ensure the machining quality of the drill pipe, it must be aligned before the drill pipe rotates synchronously with the chuck. This ensures that the deviation between the drill pipe's central axis and the spindle's central axis is within a controlled range, guaranteeing that the machined male or female thread is symmetrical around the drill pipe's central axis.

[0004] Most existing pipe threading lathes use electric four-jaw chucks with automatic clamping. However, the joints of drill rods are prone to uneven wear due to environmental factors. The wear degree varies among each drill rod, and the deviation between the center axis of each drill rod and the center axis of the spindle chuck is uncertain. Each drill rod repair requires adjustment of the spindle chuck for alignment. However, existing electric four-jaw chucks cannot achieve automatic alignment; automatic alignment can only be achieved through manual measurement and adjustment. This results in long repair times and significant repair errors, compromising both the efficiency and accuracy of drill rod repair. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides a lathe chuck alignment method and alignment device, which automatically adjusts the radial position of the corresponding jaws of the lathe chuck based on the actual radial distance of each detection point on the drill rod test surface, so that the deviation between the central axis of the drill rod and the central axis of the lathe chuck is within a set deviation range, resulting in high repair efficiency and repair accuracy.

[0006] The lathe chuck alignment method provided by this invention includes the following steps:

[0007] S1. When each jaw of the lathe chuck rotates to be axially opposite to the distance detection unit, several detection points are set on the test surface of the drill rod that are axially opposite to all the jaws.

[0008] S2. Obtain the actual radial distance of all detection points fed back by the distance detection unit;

[0009] S3. Determine whether the actual radial distance between any two radially opposite detection points meets the preset correspondence. If yes, it is considered qualified. If no, control the jaw adjustment unit to adjust the position of the two jaws corresponding to the two radially opposite detection points, and repeat step S2 until the deviation between the center axis of the drill rod and the center axis of the lathe chuck is within the set deviation range.

[0010] Preferably, the axial projection of the detection probe of the distance detection unit falls on the central axis of the lathe chuck.

[0011] Preferably, the detection points include a first detection point and a third detection point arranged radially opposite to each other, and the actual radial distance includes a first actual radial distance between the first detection point and the distance detection unit and a third actual radial distance between the third detection point and the distance detection unit; the preset correspondence includes a first preset correspondence relationship established based on the first actual radial distance and the third actual radial distance, and the first preset correspondence relationship is as follows: ,in, This is the first actual radial distance, in mm; This is the third actual radial distance, in mm; for and The absolute difference between the two is expressed in mm.

[0012] Preferably, the jaws include a first jaw opposite to a first detection point along the axial direction and a third jaw opposite to a third detection point along the axial direction; the jaw adjustment unit is controlled to adjust the positions of the two jaws corresponding to the two detection points arranged radially opposite each other, specifically including the following steps:

[0013] judge If the condition is met, then the control jaw adjustment unit will drive the first jaw and the third jaw to move radially towards the center axis of the lathe chuck, respectively. ;

[0014] Or, judge If the condition is met, then the control jaw adjustment unit will drive the first jaw and the third jaw to move radially towards the first jaw away from the central axis of the lathe chuck. .

[0015] Preferably, the detection points include a second detection point and a fourth detection point arranged radially opposite to each other, and the actual radial distance includes a second actual radial distance between the second detection point and the distance detection unit and a fourth actual radial distance between the fourth detection point and the distance detection unit; the preset correspondence includes a second preset correspondence relationship established based on the second actual radial distance and the fourth actual radial distance, and the second preset correspondence relationship is as follows: ,in, This is the second actual radial distance, in mm; This is the fourth actual radial distance, in mm; for and The absolute difference between the two is expressed in mm.

[0016] Preferably, the jaws include a second jaw opposite to the second detection point along the axial direction and a fourth jaw opposite to the fourth detection point along the axial direction; the jaw adjustment unit is controlled to adjust the position of the two jaws corresponding to the two detection points arranged radially opposite each other, specifically including the following steps:

[0017] judge If the condition is met, then the control jaw adjustment unit will drive the second jaw and the fourth jaw to move radially towards the center axis of the lathe chuck. ;

[0018] Or, judge If the condition is met, then the control jaw adjustment unit will drive the second jaw and the fourth jaw to move radially away from the center axis of the lathe chuck. .

[0019] Preferably, the surface to be tested is the external thread stop surface of the drill pipe joint or the internal thread boring surface of the drill pipe joint.

[0020] Preferably, the chuck adjustment unit:

[0021] An adjusting rod is used to be detachably fixed to the opposing jaws in the radial direction so that the jaws connected in the radial direction can move.

[0022] A transmission mechanism, which connects the adjusting rod to the lathe gearbox, is used to transmit the torque provided by the lathe gearbox to the adjusting rod.

[0023] The lathe chuck alignment device provided by the present invention includes:

[0024] The distance detection unit is used to detect the actual radial distance of all detection points when each jaw of the lathe chuck is axially opposite to the chuck, and several detection points on the test surface of the drill rod are axially opposite to all jaws.

[0025] The signal receiving unit acquires the actual radial distance of all detection points fed back by the distance detection unit;

[0026] The judgment execution unit is used to determine whether the actual radial distance between any two radially opposite detection points meets the preset correspondence; if yes, it is judged as qualified; if no, it controls the jaw adjustment unit to adjust the position of the two jaws corresponding to the two radially opposite detection points in the radial direction, and executes step S2 again until the deviation between the center axis of the drill rod and the center axis of the lathe chuck is within the set deviation range.

[0027] Preferably, the distance detection unit is fixed to the detection bracket, and the detection bracket is fixed to the lathe body.

[0028] Compared to the prior art, the lathe chuck alignment method provided by the present invention includes the following steps: S1, when each jaw of the lathe chuck rotates to be axially opposite to the distance detection unit, several detection points are set on the test surface of the drill rod, which are axially opposite to all the jaws; S2, the actual radial distance of all the detection points fed back by the distance detection unit is obtained; S3, it is determined whether the actual radial distances corresponding to any two radially opposite detection points meet the preset correspondence; if yes, it is judged as qualified; if no, the jaw adjustment unit is controlled to adjust the position of the two jaws corresponding to the two radially opposite detection points radially, and step S2 is repeated until the deviation between the central axis of the drill rod and the central axis of the lathe chuck is within the set deviation range.

[0029] This invention adds a distance detection unit and a jaw adjustment unit to automatically adjust the radial position of the corresponding jaws according to the actual radial distance of each detection point on the drill rod surface to be measured, so that the deviation between the central axis of the drill rod and the central axis of the lathe chuck is within the set deviation range, and the lathe chuck is aligned. The entire alignment process has a high degree of automation and low manual intervention, and the repair efficiency and repair accuracy are improved.

[0030] The technical solution of the lathe chuck alignment device provided by this invention is the same as the alignment method, and has the same beneficial effects. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 This is a flowchart illustrating a lathe chuck alignment method according to a specific embodiment of the present invention.

[0033] Figure 2 This is a structural diagram of a lathe chuck alignment device provided in a specific embodiment of the present invention;

[0034] Figure 3 for Figure 2 Side view of the chuck and jaw adjustment unit of a medium lathe after assembly;

[0035] Figure 4 for Figure 3 The main view;

[0036] Figure 5 This is a detection state diagram showing the actual radial distance of the first detection point of the drill rod when the distance detection unit is axially opposite to the first chuck.

[0037] Figure 6 This is a diagram showing the state when the distance detection unit is outside the drill pipe.

[0038] Figure 7 This is a diagram showing the state of the distance detection unit inside the drill pipe.

[0039] The attached figures are labeled as follows:

[0040] 1. Lathe chuck; 2. Distance detection unit; 3. Drill rod; 4. Chuck adjustment unit; 5. Lathe gearbox; 6. Controller; 7. Detection bracket; and 8. Lathe body.

[0041] First chuck 11, second chuck 12, third chuck 13 and fourth chuck 14;

[0042] Detection probe 21;

[0043] External thread white stop surface 31 and internal thread boring surface 32;

[0044] Adjusting rod 41 and transmission mechanism 42. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] First, it should be noted that the axial direction in this article refers to the direction parallel to the central axis of the lathe chuck, and the radial direction refers to the direction parallel to the radial direction of the lathe chuck.

[0048] An embodiment of the present invention discloses an alignment method for a lathe chuck, which is used to align a drill pipe 3 before repairing the drill pipe 3 on a pipe thread lathe. It should be noted that the lathe chuck 1 in the text has an even number of jaws, and any two jaws are radially opposite to each other. Specifically, in this specific embodiment, the lathe chuck 1 is a four-jaw chuck with four jaws, and the four jaws are arranged in pairs along the radial direction of the lathe chuck 1.

[0049] As shown in the appendix Figure 1 The steps of the alignment method include:

[0050] S1. When each jaw of the lathe chuck 1 rotates to be axially opposite to the distance detection unit 2, a plurality of detection points are arranged on the待测 surface of the drill pipe 3 along the axis and opposite to all the jaws one by one.

[0051] It should be noted that the distance detection unit 2 is fixedly arranged, specifically it can be a laser rangefinder, but its type is not limited to this. As shown in the appendix Figures 2 to 5 When each jaw of the lathe chuck 1 rotates to be axially opposite to the distance detection unit 2, it can be understood that all the jaws rotate synchronously with the lathe chuck 1. When the lathe chuck 1 rotates one week, each jaw can be axially aligned with the distance detection unit 2 along the axis of the lathe chuck 1. The number of detection points arranged on the待测 surface of the drill pipe 3 is the same as the number of jaws. When one of the jaws rotates to be axially opposite to the distance detection unit 2, one of the detection points on the待测 surface of the drill pipe 3 is axially opposite to this jaw along the axis of the lathe chuck 1 and radially opposite to the distance detection unit 2, providing conditions for the distance detection unit 2 to detect the actual radial distance of this detection point. [[ID=1�]]

[0052] S2. Obtain the actual radial distances of all the detection points fed back by the distance detection unit 2.

[0053] When the distance detection unit 2 detects the actual radial distance of each detection point, the distance detection unit 2 sends the detected distance signal to the signal receiving unit, and the signal receiving unit then obtains the actual radial distances of each detection point. It should be noted that the actual radial distance in the text refers to the radial distance between the detection point and the detection probe 21 of the distance detection unit 2 when one of the detection points is axially opposite to one of the jaws along the axis of the lathe chuck 1 and radially opposite to the detection probe 21 of the distance detection unit 2.

[0054] S3. Judge whether the actual radial distances corresponding to any two radially opposite detection points meet the preset corresponding relationship; if so, it is judged as qualified; if not, as shown in the appendix Figure 4As shown, the control jaw adjustment unit 4 adjusts the position of the two jaws corresponding to the two detection points set radially opposite each other in the radial direction, and performs step S2 again until the deviation between the central axis of the drill rod 3 and the central axis of the lathe chuck 1 is within the set deviation range.

[0055] The signal receiving unit sends all acquired actual radial distances to the judgment execution unit. The judgment execution unit groups all actual radial distances into pairs, and then compares the two actual radial distances in each group according to a preset correspondence. Finally, based on the judgment results, it analyzes whether it is necessary to control the jaw adjustment unit 4 to adjust the position of each jaw along the radial direction of the lathe chuck 1. It should be noted that whether two radially opposite jaws need radial adjustment depends on whether the absolute difference of the actual radial distance between the two radially opposite detection points is within the set deviation range. Here, the jaws and detection points are relative to each other along the axial direction of the lathe chuck 1. The set deviation range mentioned in this article can be set according to the specifications and repair accuracy of the repair drill rod 3, and is not specifically limited here.

[0056] The present invention adds a distance detection unit 2 and a jaw adjustment unit 4 to automatically adjust the radial position of the corresponding jaw according to the actual radial distance of each detection point, so that the deviation between the central axis of the drill rod 3 and the central axis of the lathe chuck 1 is within the set deviation range, and the lathe chuck 1 is aligned. The entire alignment process has a high degree of automation and low manual intervention, and the repair efficiency and repair accuracy are improved.

[0057] The key point is, as attached Figure 6 and 7 As shown, the axial projection of the detection probe 21 of the distance detection unit 2 falls on the central axis of the lathe chuck 1, so that the detection probe 21 can be opposite to each jaw in the axial direction of the lathe chuck 1. Thus, the distance detection unit 2 can use the central axis of the lathe chuck 1 as a reference to detect the drill rod 3. The special setting of the distance detection unit 2 can reduce the detection deviation to a certain extent, making the distance between the central axis of the lathe chuck 1 and the central axis of the drill rod 3 smaller, which is beneficial to improving the detection accuracy.

[0058] The detection points include a first detection point and a third detection point arranged radially opposite each other. The actual radial distance includes the first actual radial distance between the first detection point and the distance detection unit 2 and the third actual radial distance between the third detection point and the distance detection unit 2. The preset correspondence includes a first preset correspondence relationship established based on the first actual radial distance and the third actual radial distance. The first preset correspondence relationship is as follows: ,in, This is the first actual radial distance, in mm; This is the third actual radial distance, in mm; for and The absolute difference between the two is expressed in mm.

[0059] The jaws include a first jaw 11 opposite to a first detection point along the axial direction and a third jaw 13 opposite to a third detection point along the axial direction; the jaw adjustment unit 4 is controlled to adjust the positions of the two jaws corresponding to the two radially opposite detection points in the radial direction, specifically including the following steps:

[0060] judge If the condition is met, then the control jaw adjustment unit 4 will drive the first jaw 11 and the third jaw 13 to move radially toward the first jaw 11 towards the central axis of the lathe chuck 1. ;

[0061] Or, judge If the condition is met, then the control jaw adjustment unit 4 will drive the first jaw 11 and the third jaw 13 to move radially toward the first jaw 11 away from the central axis of the lathe chuck 1. .

[0062] The detection points include a second detection point and a fourth detection point arranged radially opposite each other. In the circumferential direction of the lathe chuck 1, the first detection element, the second detection element, the third detection point, and the fourth detection point are arranged sequentially. The actual radial distance includes the second actual radial distance between the second detection point and the distance detection unit 2, and the fourth actual radial distance between the fourth detection point and the distance detection unit 2; the preset correspondence includes a second preset correspondence relationship established based on the second and fourth actual radial distances, the second preset correspondence relationship being: ,in, This is the second actual radial distance, in mm; This is the fourth actual radial distance, in mm; for and The absolute difference between the two is expressed in mm.

[0063] The jaws include a second jaw 12 opposite to the second detection point along the axial direction and a fourth jaw 14 opposite to the fourth detection point along the axial direction; the jaw adjustment unit 4 is controlled to adjust the position of the two jaws corresponding to the two detection points that are arranged radially opposite each other in the radial direction, and the specific steps include:

[0064] judge If the condition is met, then the control jaw adjustment unit 4 will drive the second jaw 12 and the fourth jaw 14 to move radially toward the center axis of the lathe chuck 1. ;

[0065] Or, judge If the condition is met, then the control jaw adjustment unit 4 will drive the second jaw 12 and the fourth jaw 14 to move radially away from the central axis of the lathe chuck 1. .

[0066] In other words, the jaw adjustment unit 4 can adaptively adjust the radial distance of the corresponding jaw according to the absolute difference between two relatively set detection points, resulting in higher repair accuracy.

[0067] As attached Figure 6 As shown, the surface to be measured on drill pipe 3 can be the external thread stop surface 31 of the drill pipe joint, in which case the distance detection unit 2 is located outside drill pipe 3. (See attached diagram) Figure 7 As shown, the surface to be measured on drill rod 3 can also be the internal thread boring surface 32 of the drill rod joint, in which case the distance detection unit 2 is located inside drill rod 3. That is to say, the distance detection unit 2 can be used to detect the inner and outer surfaces of drill rod 3, eliminating the need for frequent replacement of the distance detection unit 2 and thus providing better adaptability.

[0068] The jaw adjustment unit 4 includes an adjusting rod 41 and a transmission mechanism 42. When one of the jaws of the lathe chuck 1 is aligned with the adjusting screw of the adjusting rod 41, the adjusting rod 41 moves radially downward along the lathe chuck 1 until it is detachably and fixedly connected to the adjusting screw of the opposite jaw. The adjusting rod 41 then drives the connected jaws radially towards or away from the central axis of the lathe chuck 1, thereby adjusting the position of the jaws radially and thus adjusting the position of the central axis of the drill rod 3. The transmission mechanism 42 connects the adjusting rod 41 and the lathe gearbox 5, and transmits the torque provided by the lathe gearbox 5 to the adjusting rod 41. The lathe gearbox 5 provides power to the adjusting rod 41, eliminating the need for a separate driving component and reducing costs. Specifically, the lathe gearbox 5 drives the transmission mechanism 42 to rotate, and the transmission mechanism 42 drives the adjusting rod 41 to move. The transmission mechanism 42 can be a belt drive mechanism, but its type is not limited to this.

[0069] This invention discloses a lathe chuck alignment device, comprising:

[0070] The distance detection unit 2 is used to detect the actual radial distance of all detection points when each jaw of the lathe chuck 1 is axially opposite to the other jaws and several detection points on the test surface of the drill rod 3 are axially opposite to all jaws.

[0071] The signal receiving unit acquires the actual radial distance of all detection points fed back by the distance detection unit 2;

[0072] A judgment and execution unit, which is used to judge whether the actual radial distance corresponding to any two radially opposite detection points meets a preset corresponding relationship; if so, it is judged as qualified; if not, it controls the jaw adjustment unit 4 to adjust the positions of the two jaws corresponding to the two radially opposite detection points along the radial direction, and then executes step S2 again until the deviation between the central axis of the drill pipe 3 and the central axis of the lathe chuck 1 is within the set deviation range. Among them, the alignment device is equipped with a controller 6, and the controller 6 includes a signal receiving unit and a judgment and execution unit. The judgment and execution unit is connected to the jaw adjustment unit 4 through a data transmission line.

[0073] The alignment method and the technical solution of the alignment device for the lathe chuck provided by the present invention are the same and have the same beneficial effects, which will not be elaborated here.

[0074] The above alignment device further includes a data display unit, which is connected to the signal receiving unit and is used to display in real time the actual radial distance of each detection point of the drill pipe 3 or the radial movement distance of the jaw connected to the adjustment of the adjustment rod 41. The above alignment device further includes an early warning reminder unit, which is connected to the judgment and execution unit. When it is judged as qualified, the judgment and execution unit sends a signal to the early warning reminder unit to start the early warning reminder unit to remind the processing personnel that the drill pipe 3 has been aligned.

[0075] The distance detection unit 2 is fixedly arranged on the detection bracket 7, and the detection bracket 7 is fixedly arranged on the lathe body 8, ensuring that the distance detection unit 2 is fixed and reliable during the detection process, avoiding the position change of the distance detection unit 2 from affecting the accuracy of the detection result, and being beneficial to improving the repair accuracy.

[0076] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0077] Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A method for aligning a lathe chuck, characterized in that the steps include... include: S1. When each jaw of the lathe chuck rotates to be axially opposite to the distance detection unit, several detection points are set on the test surface of the drill rod that are axially opposite to all the jaws. S2. Obtain the actual radial distance of all the detection points fed back by the distance detection unit; S3. Determine whether the actual radial distance between any two radially opposite detection points satisfies the preset correspondence. If yes, it is considered qualified. If no, control the jaw adjustment unit to adjust the position of the two jaws corresponding to the two radially opposite detection points, and repeat step S2 until the deviation between the central axis of the drill rod and the central axis of the lathe chuck is within the set deviation range.

2. The lathe chuck alignment method according to claim 1, characterized in that, The axial projection of the detection probe of the distance detection unit falls on the central axis of the lathe chuck.

3. The lathe chuck alignment method according to claim 1, characterized in that, The detection points include a first detection point and a third detection point arranged radially opposite each other. The actual radial distance includes a first actual radial distance between the first detection point and the distance detection unit, and a third actual radial distance between the third detection point and the distance detection unit. The preset correspondence includes a first preset correspondence relationship established based on the first actual radial distance and the third actual radial distance. The first preset correspondence relationship is as follows: ,in, This is the first actual radial distance, in mm; This is the third actual radial distance, in mm; for and The absolute difference between the two is expressed in mm.

4. The lathe chuck alignment method according to claim 3, characterized in that, The jaws include a first jaw opposite to the first detection point along the axial direction and a third jaw opposite to the third detection point along the axial direction; the control jaw adjustment unit adjusts the positions of the two jaws corresponding to the two detection points arranged radially opposite each other along the radial direction, specifically including the following steps: judge If the condition is met, then control the jaw adjustment unit to move the first jaw and the third jaw radially toward the center axis of the lathe chuck. ; Or, judge If the condition is met, then control the jaw adjustment unit to move the first jaw and the third jaw radially toward the first jaw away from the central axis of the lathe chuck. .

5. The lathe chuck alignment method according to claim 1, characterized in that, The detection points include a second detection point and a fourth detection point arranged radially opposite each other. The actual radial distance includes a second actual radial distance between the second detection point and the distance detection unit, and a fourth actual radial distance between the fourth detection point and the distance detection unit. The preset correspondence includes a second preset correspondence relationship established based on the second actual radial distance and the fourth actual radial distance. The second preset correspondence relationship is as follows: ,in, This is the second actual radial distance, in mm; This is the fourth actual radial distance, in mm; for and The absolute difference between the two is expressed in mm.

6. The lathe chuck alignment method according to claim 5, characterized in that, The jaws include a second jaw opposite to the second detection point along the axial direction and a fourth jaw opposite to the fourth detection point along the axial direction; the control jaw adjustment unit adjusts the positions of the two jaws corresponding to the two detection points arranged radially opposite each other along the radial direction in the radial direction, specifically including the following steps: judge If the condition is met, then control the jaw adjustment unit to move the second jaw and the fourth jaw radially toward the center axis of the lathe chuck. ; Or, judge If the condition is met, then control the jaw adjustment unit to move the second jaw and the fourth jaw radially away from the central axis of the lathe chuck. .

7. The lathe chuck alignment method according to any one of claims 1 to 6, characterized in that, The surface to be tested is the external thread stop surface of the drill pipe joint or the internal thread boring surface of the drill pipe joint.

8. The lathe chuck alignment method according to any one of claims 1 to 6, characterized in that, The claw adjustment unit: An adjusting rod is used for radially and detachably fixed to the opposing jaws to move the jaws in a radially connected manner. A transmission mechanism is connected to the adjusting rod and the lathe gearbox, and is used to transmit the torque provided by the lathe gearbox to the adjusting rod.

9. A lathe chuck alignment device, characterized in that, include: A distance detection unit is used to detect the actual radial distance of all the detection points when each jaw of the lathe chuck is axially opposite to the chuck, and several detection points on the test surface of the drill rod are axially opposite to all the jaws. A signal receiving unit acquires the actual radial distance of all the detection points fed back by the distance detection unit; The judgment execution unit is used to determine whether the actual radial distance between any two radially opposite detection points meets the preset correspondence relationship; if yes, it is judged as qualified; if no, it controls the jaw adjustment unit to adjust the position of the two jaws corresponding to the two radially opposite detection points in the radial direction, and executes step S2 again until the deviation between the central axis of the drill rod and the central axis of the lathe chuck is within the set deviation range.

10. The lathe chuck alignment device according to claim 9, characterized in that, The distance detection unit is fixed to the detection bracket, and the detection bracket is fixed to the lathe body.

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