An automatic testing device for machining oilfield centralizers on a lathe

Abstract

This invention relates to the field of lathe machining technology for oilfield centralizers, and discloses an automatic inspection device for lathe machining of oilfield centralizers. The device includes a lathe and a centralizer component machined by the lathe. It also includes an automatic inspection component located on one side of the lathe. After the centralizer component is machined, the automatic inspection component automatically inspects the outer diameter and airtightness of the component. This invention has the following advantages and effects: After the centralizer component is machined, it can be conveyed by a conveyor belt and quickly cooperates with the inspection cylinder to simultaneously achieve outer diameter and airtightness inspection. No additional preparation steps are required. The inspection accuracy is high and the efficiency is high. The inspection component has a practical structure, and the inspection and response process is rapid and simple. It can meet the inspection and subsequent conveying needs of the centralizer component, allowing for connection to different subsequent inspection equipment, and has high adaptability.

Description

Technical Field

[0001] This invention relates to the field of centralizer lathe machining technology, and in particular to an automatic testing device for oilfield centralizer lathe machining. Background Technology

[0002] Centralizer casing machining is a common process in petroleum equipment manufacturing. By machining the outer diameter, the problem of uneven cement sheath thickness caused by eccentricity is reduced, making the centralizer support reliable and avoiding accidents such as blowouts and stuck drill bits.

[0003] Chinese Patent CN209495630U discloses a centralizer outer diameter testing machine, including a worktable and a gantry frame mounted on the worktable. A cylinder is vertically mounted on the gantry frame, and a detection ring is connected to the piston rod of the cylinder. A guiding device is provided on the gantry frame, comprising a guide tube vertically fixed to the gantry frame, a guide rod slidably connected to the guide tube, and a crossbeam fixed to the lower end of the guide rod. The piston rod of the cylinder is hinged to the crossbeam, and the detection ring is mounted on the crossbeam. A flat plate is welded to the top of the crossbeam, and a detection hole is formed in the flat plate. The detection ring is fixed to the bottom surface of the flat plate. This machine is used for testing the outer diameter of centralizers, enabling it to detect whether the outer diameter meets the upper and lower limits.

[0004] Based on the above, the inventors believe that the current testing process for the finished products of the centralizer components after machining is quite complicated. After the outer diameter test is completed, a cumbersome air tightness test is also required. Existing testing equipment is not able to complete the two tests at the same time, which makes the testing process cumbersome and time-consuming, affecting production efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic testing device for oilfield centralizer lathe machining, which can quickly test the outer diameter and airtightness of centralizer components.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an automatic detection device for oilfield centralizer lathe machining, including a lathe and a centralizer component machined by the lathe, the detection device also includes an automatic detection component disposed on one side of the lathe, after the centralizer component is machined, the automatic detection component completes the automatic detection of the outer diameter and airtightness of the centralizer component;

[0007] The automatic detection assembly includes a conveyor belt, a detection placement piece, a detection component, and an adapter component. The detection placement piece is installed on the conveyor belt. After the centralizer component to be detected is placed on the detection placement piece, it is conveyed towards the detection component via the conveyor belt. The detection component is located above the conveyor belt, and the detection component adjusts its lateral and vertical positions through the adapter component to cooperate with the detection placement piece, thereby realizing the adaptation and detection of centralizer components of different sizes and specifications.

[0008] A further feature of the present invention is that the detection placement component is provided at two or more equidistant locations on the conveyor belt, and the detection placement component includes a pad fixed at the bottom end on the conveyor belt, a placement plate fixedly connected at the bottom end to the pad, and placement grooves equidistantly opened on the placement plate, and a leakage detection component is provided on the placement plate.

[0009] By adopting the above technical solution, a supporting and fixing force is provided for the placement plate.

[0010] A further feature of the present invention is that there are two or more placement slots, and the inner diameter of each placement slot matches the outer diameter of the centralizer components of different sizes. During testing, the centralizer components are coaxially inserted into the placement slots.

[0011] By adopting the above technical solution, testing costs are reduced, procedures are simplified, and testing needs are met.

[0012] A further feature of the present invention is that there is a gap between the bottom end of the placement plate and the surface of the conveyor belt, and the air leakage detection component includes a detection hole with its top end communicating with the placement groove and a gas flow meter with its input end coaxially connected to the detection hole.

[0013] By adopting the above technical solution, installation space is provided for the gas flow meter through intervals to facilitate airtightness testing.

[0014] A further embodiment of the present invention is that the detection assembly includes a detection cylinder that can be coaxial with the centralizer component, a mounting bracket fixedly connected to the outside of the detection cylinder, a sealing assembly disposed on the detection cylinder, and a synchronous detection component disposed on the detection cylinder for detecting the airtightness and outer diameter of the centralizer component.

[0015] By adopting the above technical solution, when the centralizer component is sent under the detection cylinder and kept coaxial, it can be quickly detected by the detection cylinder.

[0016] A further feature of the present invention is that the detection cylinder is in the form of a cylindrical tube, and the mounting frame includes a fixing claw that is fixedly fitted to the outer wall of the detection cylinder, a synchronization block that is fixedly connected to the fixing claw on the outside, and an L-shaped support fixed above the synchronization block. The synchronization block is connected to the adapter component.

[0017] By adopting the above technical solution, the detection cylinder can be kept coaxial with the centralizer component.

[0018] A further provision of the present invention is that the inner wall of the detection cylinder is provided with a light-absorbing coating, and the synchronous detection component includes a laser detector embedded in the detection cylinder.

[0019] By adopting the above technical solution, the laser beam of the laser detector is concentric with the center of the detection cylinder.

[0020] A further feature of the present invention is that the synchronous detection component includes an airtightness detection component, which includes a compressor and a precision pressure regulating valve fixed on an L-shaped support. An air inlet pipe is embedded and fixed in the outer wall of the detection cylinder. The input and output ends of the precision pressure regulating valve are respectively connected to the compressor and the air inlet pipe through pipes.

[0021] By adopting the above technical solution, compressed air for airtightness testing is generated by a compressor.

[0022] A further provision of the present invention is that the sealing assembly includes a cylinder fixedly mounted on an L-shaped support and a sealing disc whose periphery slides in contact with the inner wall of the detection cylinder.

[0023] By adopting the above technical solution, the detection cylinder moves downward while the sealing components remain synchronized.

[0024] A further provision of the present invention is that the adapter component includes a horizontal axis slider and a vertical axis slider, the sliding part of the horizontal axis slider is fixedly connected to the synchronization block, and the horizontal axis slider is fixedly installed on the sliding part of the vertical axis slider.

[0025] By adopting the above technical solution, the bottom end of the longitudinal axis sliding component remains fixed to the conveyor belt.

[0026] The beneficial effects of this invention are:

[0027] 1. After the centering device components are machined, they can be conveyed by the conveyor belt and quickly cooperate with the testing cylinder to simultaneously achieve outer diameter and airtightness testing. This optimizes the cumbersome preparation process and combines the two processes into one, shortening the time required for traditional testing steps. It also reduces light interference, thereby improving the accuracy of laser testing and ensuring testing efficiency.

[0028] 2. The detection component has a practical structure, and the detection and response process is fast and simple. It can meet the detection and subsequent transportation needs of the centralizer components, so as to connect with the detection equipment of different subsequent projects and has high adaptability.

[0029] 3. It can adapt to the testing of centralizer components of different specifications. One machine can meet the testing of the outer diameter and airtightness of the centralizer. The required manufacturing and use costs are relatively low. It has a high degree of automation, is easy for workers to control, and helps to reduce the labor intensity of workers and improve processing efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of an automatic testing device for oilfield centralizer lathe machining, provided in an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the structure of the automatic detection component in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the detection placement component in an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the detection component in an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the working state of the detection cylinder in an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the internal structure of the detection cylinder in an embodiment of the present invention.

[0037] In the diagram, 1. Lathe; 11. Centralizer component; 2. Automatic detection assembly; 3. Conveyor belt; 4. Detection placement component; 5. Detection assembly; 6. Adapter assembly; 41. Pad; 42. Placement plate; 43. Placement slot; 44. Detection hole; 45. Gas flow meter; 51. Detection cylinder; 52. Mounting bracket; 53. Sealing assembly; 54. Laser detector; 55. Air tightness detection component; 511. Light-absorbing coating; 521. Fixing claw; 522. Synchronizing block; 523. L-shaped support; 531. Cylinder; 532. Sealing disc; 55. Air supply assembly; 551. Compressor; 552. Precision pressure regulating valve; 553. Inlet pipe; 61. Horizontal axis sliding component; 62. Vertical axis sliding component. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] This invention specifically provides an automatic testing device for oilfield centralizer lathe machining. Please refer to [link / reference]. Figures 1-6 It includes a lathe 1, a centralizer component 11 machined by the lathe 1, and an automatic detection component 2 disposed on one side of the lathe 1. After the centralizer component 11 is machined, the automatic detection component 2 automatically detects the outer diameter and airtightness of the centralizer component 11.

[0040] The automatic detection component 2 includes a conveyor belt 3, a detection placement component 4, a detection component 5, and an adapter component 6. The conveyor belt 3 is located on one side of the lathe 1, preferably in a direction that is convenient for placing the centralizer component 11 into the conveyor belt 3 after it has been machined. The centralizer component 11 is a cylindrical sleeve after its external shape has been machined. The detection process is to detect the outer diameter and airtightness of the centralizer component 11 after it has been machined into a finished product.

[0041] Specifically, the testing placement piece 4 is installed on the conveyor belt 3. After the centralizer component 11 to be tested is placed on the testing placement piece 4, it is conveyed towards the testing assembly 5 via the conveyor belt 3. The testing assembly 5 is located above the conveyor belt 3, and the testing assembly 5 is adjusted in the horizontal and vertical positions by the adapter component 6 to cooperate with the testing placement piece 4, so as to realize the adaptation testing of centralizer components 11 of different sizes and specifications.

[0042] Furthermore, there are two or more detection placement pieces 4 equidistantly arranged on the conveyor belt 3. The conveyor belt 3 is intermittently started and stopped, and the travel distance of each conveying is consistent, which is the spacing distance of each detection placement piece 4. This allows the next detection placement piece 4 to be accurately placed into the detection position after the detection placement piece 4 sends the straightener component 11 under the detection assembly 5 for detection, so as to cooperate with the detection assembly 5 for detection and achieve accurate and continuous automatic detection.

[0043] Specifically, the detection placement component 4 includes a pad 41 fixed at the bottom end on the conveyor belt 3, a placement plate 42 fixedly connected at the bottom end to the pad 41, and placement grooves 43 equidistantly opened on the placement plate 42. The placement plate 42 is provided with an air leakage detection component. There are two pads 41, located at both ends of the bottom surface of the placement plate 42, thereby providing support and fixing force for the placement plate 42, so that the placement plate 42 can be moved with the conveyor belt 3.

[0044] In practice, the type of placement groove 43 is a circular groove, and there are more than two placement grooves 43. The inner diameter of each placement groove 43 matches the outer diameter of the centralizer component 11 of different sizes. The size matching between the two is allowed to have tolerance, and the tolerance is ±1% of the outer diameter.

[0045] During testing, the centralizer component 11 is coaxially inserted into the placement slot 43. The commonly processed centralizer components 11 have external dimensions of 73.02mm, 88.9mm, 114.3mm, 139.7mm, 177.8mm, and even other customized sizes. The inner diameter of each placement slot 43 corresponds to the maximum tolerance value of the above specifications according to actual production needs. This allows for the airtightness and outer diameter testing of centralizer components 11 of different specifications to be directly achieved through the placement plate 42 during processing, thereby saving testing costs and processes while meeting testing requirements.

[0046] Specifically, there is a gap between the bottom end of the placement plate 42 and the surface of the conveyor belt 3. The air leakage detection component includes a detection hole 44 with its top end communicating with the placement groove 43 and a gas flow meter 45 with its input end coaxially connected to the detection hole 44. The detection hole 44 communicates with the middle cavity of the centralizer component 11 and provides installation space for the gas flow meter 45 through the gap to facilitate air tightness testing.

[0047] Furthermore, the testing assembly 5 includes a testing cylinder 51 that can be coaxial with the centralizer component 11, a mounting bracket 52 that is fixedly connected to the outside of the testing cylinder 51, a sealing assembly 53 provided on the testing cylinder 51, and a synchronous testing component provided on the testing cylinder 51 to test the airtightness and outer diameter of the centralizer component 11, so that when the centralizer component 11 is sent into the lower part of the testing cylinder 51 and remains coaxial, it can be quickly tested through the testing cylinder 51.

[0048] It is worth noting that the standard for the travel of each conveyor belt 3 is: the travel required for the placement plate 42 to send the centering component 11 into the bottom of the detection cylinder 51 and make the two coaxial.

[0049] Specifically, the detection cylinder 51 has a cylindrical tubular structure, and the mounting frame 52 includes a fixing claw 521 that is fixedly attached to the outer wall of the detection cylinder 51, a synchronization block 522 that is fixedly connected to the fixing claw 521 on the outside, and an L-shaped support 523 fixed above the synchronization block 522. The synchronization block 522 is connected to the adapter component 6.

[0050] By adopting the above technical solution, for the centralizer component 11 with different outer diameter specifications, the position of the matching placement groove 43 is different. Therefore, the detection cylinder 51 needs to move in the left and right directions through the adapter component 6. The stroke of the detection cylinder 51 moving left and right each time is the distance between the centers of the placement grooves 43, so that the detection cylinder 51 can keep coaxial with the centralizer component 11.

[0051] During testing, the inner wall of the testing cylinder 51 is provided with a light-absorbing coating 511. The preferred material is a metal-ceramic coating, which has a high light absorption rate and good wear resistance, and can reduce reflection, so that the inside of the testing cylinder 51 is kept at a low level of darkness, thereby improving the detection accuracy of the laser detector 54 and reducing light interference. The synchronous detection component includes a laser detector 54 embedded in the testing cylinder 51. There are at least two laser detectors 54, which are located in the front and rear directions of the testing cylinder 54, respectively. The laser beams of the laser detectors 54 are concentric with the center of the testing cylinder 51.

[0052] When the centralizer component 11 is conveyed to the bottom of the detection cylinder 51 and stops, the detection cylinder 51 is moved vertically downward through the conveying of the adapter component 6, so that the detection cylinder 51 is gradually fitted into the outside of the centralizer component 11 from top to bottom in a coaxial manner. At this time, the inner wall of the detection cylinder 51 is closed and the brightness is extremely low, so that the laser detector 54 can detect the distance between the laser detector 54 and the outer diameter of the centralizer component 11 to see if it meets the preset standard and improve the laser detection accuracy.

[0053] It is worth noting that, due to the existence of tolerances, the centralizer component 11 may be slightly off-center when it is placed in the placement slot 43. Therefore, in order to ensure the accuracy of subsequent outer diameter detection, the centralizer component 11 can be placed with the aid of an alignment device when it is placed in the placement slot 43.

[0054] The aligner includes a handle 7 for handheld use, with an alignment disc 8 fixedly attached below the handle 7. Each size of the centralizer component 11 corresponds to a specific size of aligner. An alignment post 9 is coaxially fixed at the bottom of the alignment disc 8. The outer side of the alignment post 9 is inserted into and fits into the detection hole 44. The outer diameter of the alignment disc 8 and the alignment post 9 is consistent with the inner diameter of the corresponding size of the centralizer component 11 and the inner diameter of the detection hole 44. Thus, when the centralizer component 11 is placed, the inner wall can fit against the alignment disc 8. Then, the alignment disc 8 is pulled out through the handle 7 to facilitate the placement of the next centralizer component 11. This ensures that the centralizer component 11 can be placed coaxially with the placement slot 45, reducing detection errors.

[0055] During implementation, hand tremors may cause the alignment plate 8 to sway left and right when it is moved upward out of the straightener component 11, causing the straightener component 11 to become eccentric on the placement slot 43. Therefore, the material of the alignment device is preferably hard plastic, which has a low cost and a hollow internal structure, resulting in a small overall mass. Due to the weight of the straightener component 11, the pushing force on the straightener component 11 when it is pulled out is generally small, and the force can be controlled when the hand pulls it out to reduce the occurrence of this situation.

[0056] To ensure accuracy, as another feasible implementation method, the preferred method is that the top of the handle 7 can be vertically connected to the output end of the cylinder or the robotic arm, and the alignment plate 8 can be vertically driven to disengage from the straightener component 11 through mechanical drive. The installation is also the same.

[0057] At the same time, the conveying speed of the conveyor belt 3 must also be limited. The conveyor belt 3 is equipped with a gradual deceleration function. When the conveyor belt 3 transports the centralizer component 11 to the bottom of the detection cylinder 51 under its own weight, it can slowly decelerate to avoid the centralizer component 11 from inertial displacement and eccentricity with the placement groove 43. The above-mentioned gradual deceleration function is a common technology of existing conveyor belts 3, so it will not be described in detail here.

[0058] Furthermore, the synchronous testing component includes an airtightness testing component 55, which includes a compressor 551 and a precision pressure regulating valve 552 fixed on an L-shaped support 523. An air inlet pipe 553 is embedded and fixed in the outer wall of the testing cylinder 51. The input and output ends of the precision pressure regulating valve 552 are connected to the compressor 551 and the air inlet pipe 553 respectively through pipes. The compressor 551 generates compressed air for airtightness testing, and the precision pressure regulating valve 552 controls the gas pressure to meet the pressure value required for the corresponding test, so that the testing gas can be input into the interior of the testing cylinder 51.

[0059] The sealing assembly 53 includes a cylinder 531 fixedly mounted on an L-shaped support 523 and a sealing disc 532 that slides in contact with the inner wall of the detection cylinder 51. The sealing disc 532 is coaxially arranged with the detection cylinder 51. When the centralizer component 11 is conveyed to the bottom of the detection cylinder 51, the detection cylinder 51 moves downward and its bottom surface fits against the placement plate 42. The sealing assembly 53 remains synchronized. Then, the cylinder 531 drives the sealing disc 532 to move downward, so that the sealing disc 532 fits tightly against the top of the centralizer component 11 and the bottom surface of the centralizer component 11 fits tightly against the placement groove 43, thereby forming a sealed detection cavity between the inner wall of the detection cylinder 51 and the outer wall of the centralizer component 11.

[0060] When the detection gas is sent into the detection chamber, if the airtightness of the centralizer component 11 is qualified, the flow rate of the gas flow meter 45 will not change. If there are cracks or gaps on the periphery of the centralizer component 11, the detection gas will rush into the detection hole 44, be detected by the gas flow meter 45 and discharged, and the airtightness related data will be obtained.

[0061] Furthermore, the adapter component 6 includes a horizontal axis slider 61 and a vertical axis slider 62. Both the horizontal axis slider 61 and the vertical axis slider 62 are electric lead screw guides. The sliding part of the horizontal axis slider 61 is fixedly connected to the synchronization block 522, and the horizontal axis slider 61 is fixedly installed on the sliding part of the vertical axis slider 62. The bottom end of the vertical axis slider 62 is fixed to the conveyor belt 3 so that the vertical axis slider 62 drives the horizontal axis slider 61 to achieve vertical displacement, thereby driving the detection cylinder 51 to achieve vertical displacement, and the horizontal axis slider 61 drives the detection cylinder 51 to achieve horizontal displacement.

[0062] It is worth noting that the travel distance settings of the centralizer component 11 and the detection cylinder 51 can be accurately positioned using existing laser rangefinders, encoders, or other existing methods. These methods are all existing and mature, and can be customized during implementation, so they will not be described in detail here.

[0063] The above description shows and illustrates the basic principles, main features, and advantages of the present invention. Standard parts used in the present invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment adopt conventional models in the prior art, which will not be described in detail here.

[0064] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic detection device for oilfield centralizer lathe machining, comprising a lathe (1) and a centralizer component (11) machined by the lathe (1), characterized in that, Further comprising an automatic detection assembly (2) arranged on one side of the lathe (1), which is used to automatically detect the outer diameter size and air tightness of the centralizer component (11) after the turning of the centralizer component (11) is completed. The automatic detection assembly (2) comprises a conveying belt (3), a detection placing piece (4), a detection assembly (5) and an adaptive assembly (6). The detection placing piece (4) is installed on the conveying belt (3). After the centralizer component (11) to be detected is placed on the detection placing piece (4), it is conveyed to the direction of the detection assembly (5) through the conveying belt (3). The detection assembly (5) is arranged above the conveying belt (3), and the detection assembly (5) adjusts the horizontal and vertical positions through the adaptive assembly (6) to cooperate with the detection placing piece (4) to realize adaptive detection of the centralizer component (11) of different sizes. The detection assembly (5) comprises a detection cylinder (51) coaxial with the centralizer component (11), a mounting bracket (52) fixedly connected with the outer side of the detection cylinder (51), a sealing assembly (53) arranged on the detection cylinder (51), and a synchronous detection piece arranged on the detection cylinder (51) to detect the air tightness and outer diameter size of the centralizer component (11). The detection cylinder (51) is in the form of a cylindrical tube. The mounting bracket (52) comprises a fixed jaw (521) fixedly attached to the outer wall of the detection cylinder (51), a synchronous block (522) fixedly connected with the outer side of the fixed jaw (521), and an L-shaped support table (523) fixedly arranged above the synchronous block (522). The synchronous block (522) is connected with the adaptive assembly (6). The sealing assembly (53) comprises a gas cylinder (531) fixedly installed on the L-shaped support table (523) and a sealing disc (532) in sliding contact with the inner wall of the detection cylinder (51). The adaptive assembly (6) comprises a horizontal shaft sliding piece (61) and a vertical shaft sliding piece (62). The sliding part of the horizontal shaft sliding piece (61) is fixedly connected with the synchronous block (522), and the horizontal shaft sliding piece (61) is fixedly installed on the sliding part of the vertical shaft sliding piece (62).

2. The automatic detection equipment for lathe machining of an oilfield centralizer according to claim 1, characterized in that: The detection placing piece (4) is equidistantly arranged on the conveying belt (3) in two or more places. The detection placing piece (4) comprises a pad (41) fixedly arranged at the bottom of the conveying belt (3), a placing plate (42) fixedly connected with the pad (41) at the bottom, and placing grooves (43) equidistantly arranged on the placing plate (42). The placing plate (42) is provided with a gas leakage detection piece.

3. The automatic detection equipment for lathe processing of an oilfield centralizer according to claim 2, characterized in that: The number of the placing grooves (43) is two or more, and the inner diameter size of each placing groove (43) matches the outer diameter size of the centralizer component (11) of different sizes. During detection, the centralizer component (11) is coaxially inserted into the placing groove (43).

4. The automatic detection equipment for lathe machining of oilfield centralizer according to claim 3, characterized in that: The bottom of the placing plate (42) is spaced apart from the surface of the conveying belt (3). The gas leakage detection piece comprises a detection hole (44) in communication with the placing groove (43) and a gas flow meter (45) coaxially connected with the detection hole (44) at the input end.

5. The automatic detection equipment for lathe processing of oilfield centralizer according to claim 4, characterized in that: The inner wall of the detection cylinder (51) is provided with a light-absorbing coating (511). The synchronous detection piece comprises a laser detector (54) embedded in the detection cylinder (51).

6. The automatic detection equipment for lathe processing of an oilfield centralizer according to claim 5, characterized in that: The synchronous detection member comprises an air tightness detection member (55), the air tightness detection member (55) comprises a compressor (551) and a precision pressure regulating valve (552) fixed on the L-shaped support (523), the outer wall of the detection cylinder (51) is embedded with an air inlet pipe (553), and the input end and the output end of the precision pressure regulating valve (552) are connected with the compressor (551) and the air inlet pipe (553) through pipelines respectively.

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