Cylinder size detection method

Abstract

The invention discloses a cylinder size detection method, which is characterized by comprising the following steps of: placing a cylinder at a cylinder placement position, and limiting and fixing the cylinder; dividing the outer surface of the cylinder body into a plurality of sampling sections, taking a plurality of sampling points along the circumference of each sampling section, and acquiring position coordinates of the sampling points by a detection assembly; calculating circle center coordinates of each sampling section according to the position coordinates of the sampling points, and jointly calculating the circle center coordinates of all the sampling sections to obtain the cylinder axis of the cylinder body; a plurality of detection sections are divided in the cylinder body, a plurality of detection points are taken from each detection section along the circumference, and the position coordinates of the detection points are obtained by the detection assembly; and calculating size parameters of the cylinder body by combining the position coordinates of the detection point with the cylindrical axis of the cylinder body, and judging whether the size of the cylinder body is qualified or not. The detection method has the advantages that the detection method is provided for internal dimension detection of the brake cylinder body and similar products, the external dimension of the cylinder body serves as calibration, the internal dimension of the cylinder body is detected, the method is simple, and detection is accurate.

Description

Technical Field

[0001] The present application belongs to the technical field of detection equipment, and specifically relates to a cylinder size detection device. Background Art

[0002] The internal dimensions of the railway brake spinning cylinder are critical. Currently, manual inspection is performed using a dial indicator. Different sizes of cylinders require different special calibration blocks for calibration. However, due to the large inner diameter and depth of the cylinder, manual measurement takes a long time. In addition, due to the small number of manual measurement points, the measurement results are prone to deviations. The cylinder is heavy, so it is difficult to carry it during manual measurement. In addition, the production environment of the cylinder is relatively harsh, and the cylinder is often attached with oil during production. The working environment is not good during manual measurement, and the working environment of the detection tool is required to be high. Summary of the invention

[0003] The purpose of this application is to provide a cylinder size detection method, which solves the problem of automatic detection of the internal size of the cylinder.

[0004] The purpose of this application is achieved through the following technical solutions:

[0005] A cylinder size detection method comprises the following steps:

[0006] The first step is to place the cylinder: place the cylinder in the cylinder placement position and fix it in position;

[0007] The second step is position sampling: the cylinder body is divided into several sampling sections, and each sampling section is selected along the circumference. The detection component obtains the position coordinates of the sampling points;

[0008] The third step is spatial calibration: the coordinates of the center of each sampling section are calculated from the sampling point position coordinates, and the coordinates of the center of all sampling sections are calculated jointly to obtain the cylindrical axis of the cylinder body;

[0009] Step 4: Sampling for detection: several detection sections are located inside the cylinder body, and several detection points are taken along the circumference of each detection section. The detection component obtains the position coordinates of the detection points;

[0010] Step 5: Size determination: Calculate the size parameters of the cylinder based on the position coordinates of the detection point and the cylindrical axis of the cylinder to determine whether the cylinder size is qualified.

[0011] Furthermore, the dimensional parameters of the cylinder body include inner wall diameter, inner wall roundness and inner wall straightness.

[0012] Furthermore, the cylinder body is placed as follows: the cylinder body is placed on the cylinder body placement position of the load-bearing component. After being placed in place, the rear limit assembly is started, and the rear limit assembly pushes the cylinder body forward until the cylinder body contacts the front limit assembly, and the cylinder body is clamped between the front limit assembly and the rear limit assembly.

[0013] Furthermore, the detection method includes a detection device, which includes a stand assembly, a load-bearing assembly is provided on the stand assembly, a front limit assembly is provided on the stand assembly, the front limit assembly is located at the front end of the cylinder placement position, a movable rear limit assembly is provided on the stand assembly, the rear limit assembly is located at the rear end of the cylinder placement position and moves between a limit position and a release position, and a detection assembly is provided on the stand assembly.

[0014] Furthermore, the platform assembly includes a platform frame, the feet of the platform frame are provided with universal pulleys and vertically adjustable legs, and the shoulders of the platform frame are provided with lifting ears.

[0015] Furthermore, the bearing assembly includes a bearing base plate, which is detachably mounted on the platform assembly, and bearing brackets are disposed on both sides of the bearing base plate, and the bearing inclined surfaces of the bearing brackets on both sides are arranged opposite to each other.

[0016] Furthermore, two sets of front and rear bearing brackets are arranged on the bearing bottom plate.

[0017] Furthermore, handles are provided on both sides of the load-bearing bottom plate.

[0018] Furthermore, an L-shaped limiting angle or limiting step is formed on the front limiting assembly, and the front limiting assembly can be detachably arranged on the stand assembly or the bearing assembly.

[0019] Furthermore, the front limit assembly is an integral limit block or a split limit block, the split limit block includes a horizontal limit block and a vertical limit block, and the front end of the horizontal limit block is connected to the vertical limit block.

[0020] Furthermore, the rear limit assembly includes a mounting plate that slides along the front-rear direction, the mounting plate is connected to the limit plate, and a limit vertical surface is formed on the limit plate.

[0021] Furthermore, the rear limit assembly includes a slide rail, which is arranged on the stand assembly or the bearing assembly. The slide rail is provided with a sliding slider, which is connected to the mounting plate, and the mounting plate is connected to the stand assembly or the bearing assembly through a telescopic cylinder.

[0022] Furthermore, a paint spraying assembly is provided on the stand assembly or the rear limit assembly, and the paint spraying assembly is positioned toward the cylinder body; after the overall inspection process is completed, if the cylinder body size does not meet the production requirements, the paint spraying assembly is started to spray paint on the cylinder body to make a mark.

[0023] Furthermore, the paint spraying assembly includes a spray head arranged on the rear limiting assembly, the spray head is arranged toward the cylinder body, the spray head is connected to the paint bucket, and the paint bucket is connected to the cylinder.

[0024] Furthermore, the detection component includes a mechanical arm, and a contact sensor is provided at the end of the mechanical arm. The mechanical arm carries the contact sensor for detection and moves to various points inside and outside the cylinder body, and the mechanical arm cooperates with the contact sensor to obtain the position coordinates. The contact sensor extends the main shaft of the sensor head to contact the cylinder body in a low-pressure manner. At this time, the contact sensor can capture the relative distance between it and the point, and at the same time, combined with the position moved by the mechanical arm, the relative spatial position coordinates of the point can be calculated.

[0025] Furthermore, the detection component also includes an in-place sensor, which is opposite to the cylinder placement position and is used to detect whether the cylinder is placed at the cylinder placement position.

[0026] Furthermore, the bench assembly is provided with a human-machine interaction component, and the rear limit component, the paint spraying component and the detection component are all electrically connected to the human-machine interaction component; the human-machine interaction component is used to control the overall detection process, and the operator selects and configures the size of the cylinder to be tested, configures the detection points, starts the detection process, and generates and views the detection report in the human-machine interaction component.

[0027] Furthermore, after the overall testing process is completed, the human-computer interaction component generates a test report and stores it in the hard disk. The test report includes the test time, test order number, material number, test data and test results.

[0028] Furthermore, the human-computer interaction component includes a temperature sensor, which is used to correct the test results. After collecting data in the early stage, the impact of temperature changes on the test is obtained. Before the test, a calibration test is performed using a standard cylinder and a correction value is calculated. The correction value is used to correct subsequent test results, and the correction value is reduced as the temperature rises until the impact of the external environment on the test results is negligible.

[0029] Beneficial effects of this application:

[0030] 1. A detection method is provided for the internal dimension detection of brake cylinder and similar products. The internal dimension of the cylinder is detected by calibrating the external dimension of the cylinder. The method is simple and the detection is accurate.

[0031] 2. Use contact sensors instead of traditional measuring tools to measure the inside of the cylinder, which reduces the impact of the working environment on the measurement results and improves the measurement accuracy.

[0032] 3. Most of the tooling is in the form of detachable and replaceable. Through different tooling, the dimensions of workpieces of various specifications can be measured, and compatible detection of products of different specifications can be achieved.

[0033] 4. The automation of the measurement process is realized. The automation of the measurement process can be realized by combining a collaborative robot arm with a contact sensor, reducing the labor intensity of operators.

[0034] 5. The automation of process connection is realized. By combining with the loading and unloading manipulator in the production line, manual loading and unloading can be realized, reducing the waste of loading and unloading time.

[0035] 6. Reduce the impact of the working environment on the measurement. Use a temperature sensor to record the real-time temperature during detection. By analyzing the test results, the impact of temperature on the detection can be extracted and compensated to improve the accuracy of the detection.

[0036] 7. Automatic screening of defective products is realized. By setting up the paint spraying component, when defective products are detected, it starts working and sprays paint on the bottom of the cylinder to make marks, thus realizing the selection and prompting of defective products.

[0037] The aforementioned main scheme of the present application and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection in the present application; and in the present application, (non-conflicting options) can also be freely combined with each other and with other options. After understanding the scheme of the present application, those skilled in the art can understand that there are many combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present application, and they are not exhaustively listed here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural stereogram of the present application (the first type of load-bearing component).

[0039] Figure 2 It is a structural stereogram of the stand assembly of the present application.

[0040] Figure 3 It is a structural stereogram of the bearing, limiting and painting components of the present application (the first bearing component).

[0041] Figure 4 It is a structural stereogram of the detection component of the present application.

[0042] Figure 5 It is a structural stereogram of the present application (second type of bearing assembly, first type of cylinder body).

[0043] Figure 6 It is a structural stereogram of the present application (second type of bearing assembly, second type of cylinder body).

[0044] In the figure: 1-bench assembly, 2-bearing assembly, 3-front limit assembly, 4-rear limit assembly, 5-painting assembly, 6-detection assembly, 7-cylinder body; 101-bench frame, 102-universal pulley, 103-leg, 104-lifting ear; 201-bearing base plate, 202-bearing bracket, 203-handle; 301-integral limit block, 302-split limit block, 303-horizontal limit block, 304-vertical limit block; 401-slide rail, 402-slider, 403-mounting plate, 404-limit plate, 405-telescopic cylinder; 501-cylinder, 502-paint bucket, 503-spray head; 601-mechanical arm, 602-contact sensor, 603-in-place sensor. DETAILED DESCRIPTION

[0045] The following non-limiting examples are provided to illustrate the present application.

[0046] Example 1

[0047] refer to Figure 1 to Figure 6 As shown, a cylinder size detection method includes the following steps: the first step is cylinder placement: the cylinder 7 is placed in the cylinder placement position and fixed by limiting. Specifically, the cylinder 7 is placed on the cylinder placement position of the bearing assembly 2. After being placed in place, the rear limit assembly 4 is started, and the rear limit assembly 4 pushes the cylinder 7 forward until the cylinder 7 contacts the front limit assembly 3, and the cylinder 7 is clamped between the front limit assembly 3 and the rear limit assembly 4.

[0048] The second step is position sampling: a plurality of sampling sections (at least three) are divided on the outer surface of the cylinder body 7 , and a plurality of sampling points are taken along the circumference of each sampling section, and the position coordinates of the sampling points are obtained by the detection component 6 .

[0049] The third step is spatial calibration: the center coordinates and outer wall radius of each sampling section are calculated from the sampling point position coordinates, and the center coordinates of all sampling sections are jointly calculated to obtain the cylindrical axis of the cylinder body 7, thereby realizing the calibration of the spatial position of the cylinder body.

[0050] The fourth step is detection sampling: a number of detection sections (at least three) are divided inside the cylinder body 7, and a number of detection points (at least six and evenly distributed) are taken along the circumference of each detection section, and the detection component 6 obtains the position coordinates of the detection points.

[0051] The fifth step is size judgment: the size parameters of the cylinder body 7 are calculated by combining the position coordinates of the detection point with the cylindrical axis of the cylinder body 7. The size parameters of the cylinder body 7 include the inner wall diameter, inner wall roundness and inner wall straightness, and then it is judged whether the size of the cylinder body 7 is qualified.

[0052] Through the above combined measurement method, the detection process can be carried out with high accuracy, and high-precision measurement values ​​are obtained for result calculation, thereby ensuring the detection accuracy. After the overall detection process is completed, if the cylinder size does not meet the production requirements, the paint spraying component 5 is started to spray paint on the cylinder 7 to make a mark.

[0053] The detection component 6 includes a robotic arm 601 and a contact sensor 602. The contact sensor 602 is provided at the arm end of the robotic arm 601. The robotic arm 601 carries the contact sensor 602 for detection and moves to various points inside and outside the cylinder body. The robotic arm 601 cooperates with the contact sensor 602 to obtain position coordinates.

[0054] The contact sensor 602 uses low pressure to extend the sensor head main shaft until it contacts the cylinder 7. At this time, the contact sensor 602 can capture the relative distance between it and the point, and at the same time, combined with the position moved by the robot arm 601, the relative spatial position coordinates of the point can be calculated.

[0055] The bench assembly 1 is provided with a human-machine interaction assembly, which is equipped next to the bench and has a touch screen, so that the operator can manually click and control to operate the human-machine interaction software. The human-machine interaction assembly is used to control the overall detection process. The operator can select and configure the size of the cylinder to be tested, configure the detection points, start the detection process, generate and view the detection report, etc. in the human-machine interaction assembly.

[0056] After the overall testing process is completed, the human-computer interaction component generates a test report and stores it in the hard disk. The test report includes the test time, test order number, material number, test data and test results (whether qualified).

[0057] The human-computer interaction component includes a temperature sensor, which is used to correct the test results. After collecting data in the early stage, the impact of temperature changes on the test is obtained. Before the test, a calibration test is carried out with a standard cylinder and the correction value is calculated. The correction value is used to correct the subsequent test results, and the correction value is reduced proportionally as the temperature rises until the impact of the external environment on the test results is negligible.

[0058] The detection method includes a detection device, which includes a stand component 1, a bearing component 2, a front limit component 3, a rear limit component 4, a paint component 5 and a detection component 6, and the rear limit component 4, the paint component 5 and the detection component 6 are all electrically connected to the human interaction component.

[0059] The stand assembly 1 is the main body of the device, and is used to realize the placement and fixation of other components. The stand assembly 1 is provided with a bearing assembly 2, a front limit assembly 3, a rear limit assembly 4, a painting assembly 5 and a detection assembly 6. A cylinder placement position is formed on the bearing assembly 2, and a cylinder 7 can be placed thereon.

[0060] The front limit assembly 3 is located at the front end of the cylinder placement position, and the rear limit assembly 4 is located at the rear end of the cylinder placement position. The rear limit assembly 4 is movably arranged on the platform assembly 1 and moves between the limit position and the release position. When the cylinder 7 is placed on the bearing assembly 2, the rear limit assembly 4 moves from the release position to the limit position, and the cylinder 7 can be clamped between the front and rear limit assemblies. When the rear limit assembly 4 moves from the limit position to the release position, the limit of the cylinder 7 is released, and the cylinder 7 can be taken and placed on the bearing assembly 2.

[0061] The detection component 6 is used to detect the size of the cylinder 7 to determine whether the cylinder 7 is qualified. The paint spraying component 5 can be arranged on the stand component 1, or it can be arranged on the rear limit component 4 to move with it. The paint spraying component 5 is placed toward the cylinder. When the data obtained by the detection component 6 determines that the size of the cylinder 7 is unqualified, the paint spraying component 5 is used to spray paint on the cylinder 7 for marking.

[0062] The platform assembly 1 includes a platform frame 101, a universal pulley 102, a leg 103, a lifting lug 104 and a top plate. The platform frame 101 is a rectangular parallelepiped frame welded from rectangular tubes, and the four legs of the platform frame 101 are provided with universal pulleys 102 to facilitate the movement and transfer of the entire device. A top plate is provided on the top of the platform frame 101, and other components are placed and fixed on the top plate.

[0063] The four feet of the platform frame 101 are provided with vertically adjustable legs 103, which are used to fix the platform frame 101 on the ground. The specific vertical position adjustment method is to pass the screws through the oblong holes to meet the fine adjustment of the fixed height position. The four shoulders of the platform frame 101 are provided with lifting ears 104 to facilitate the lifting of the entire device.

[0064] The bearing assembly 2 includes a bearing bottom plate 201, a bearing bracket 202 and a handle 203. The bearing bottom plate 201 is detachably mounted on the top plate of the stand assembly 1 by screws, and the bearing bottom plates 201 and the bearing brackets 202 of different specifications can be replaced to meet the placement of cylinder bodies 7 of different specifications.

[0065] The two sides of the bearing bottom plate 201 are fixed with bearing brackets 202, and the bearing inclined surfaces of the bearing brackets 202 on both sides are arranged oppositely to form a V-shaped lifting structure, which can lift the cylindrical cylinder body 7. Two sets of front and rear bearing brackets 202 are arranged on the bearing bottom plate 201 to ensure the stable placement of the cylinder body 7 in front and back, and meet the placement requirements of a large span. Handles 203 are welded on both sides of the bearing bottom plate 201 to facilitate the taking of the bearing bottom plate 201.

[0066] An L-shaped limit angle or limit step is formed on the front limit assembly 3, and the vertical limit surface of the limit angle or limit step is used to block the front end of the cylinder body 7. The front limit assembly 3 is detachably arranged on the stand assembly 1 or the bearing assembly 2 by screws, and is specifically fixed on the top plate. By replacing the front limit assemblies 3 of different specifications, the limit blocking of cylinder bodies 7 of different specifications can be met.

[0067] The front limit assembly 3 is in two forms: an integral limit block 301 or a split limit block 302. The integral limit block 301 is manufactured in one piece. The split limit block 302 is manufactured in blocks, including a horizontal limit block 303 and a vertical limit block 304. The front end of the horizontal limit block 303 is connected to the vertical limit block 304 by screws. The limit angle or limit step can be designed on a single block or formed by combining two blocks.

[0068] The rear limit assembly 4 includes a slide rail 401, a slider 402, a mounting plate 403, a limit plate 404 and a telescopic cylinder 405. The slide rail 401 is arranged on the platform assembly 1 or the bearing assembly 2. Specifically, two parallel slide rails 401 are arranged and fixed on the top plate. The slide rail 401 is provided with a sliding slider 402. The two sliders 402 are respectively connected to the two sides of the mounting plate 403 to realize the horizontal sliding movement of the mounting plate 403.

[0069] The mounting plate 403 is fixedly connected to one end of the telescopic cylinder 405, and the other end of the telescopic cylinder 405 is fixedly connected to the platform assembly 1 or the bearing assembly 2. Specifically, the telescopic cylinder 405 is fixed on the top plate. The telescopic cylinder 405 is an air cylinder or an oil cylinder, and the mounting plate 403 is slidable in the front-rear direction by the power of the telescopic cylinder 405.

[0070] The mounting plate 403 is fixedly connected to the limit plate 404 by screws. The limit plate 404 is an L-shaped structure. A limit vertical surface is formed on the limit plate 404. When the limit plate 404 slides back and forth following the mounting plate 403, the limit vertical surface contacts the rear end of the cylinder body 7 and pushes the cylinder body 7 until the front end of the cylinder body 7 contacts the front limit assembly 3, thereby clamping the cylinder body 7 and avoiding movement of the cylinder body during the size detection process, thereby affecting the accuracy of the final result.

[0071] The paint spraying assembly 5 includes a cylinder 501, a paint bucket 502, and a spray head 503. The cylinder 501 is fixed on the limiting plate 404, and the paint bucket 502 is connected to the cylinder 501, and air and pressure are supplied to the paint bucket 502 through the cylinder 501. The paint bucket 502 is fixed on the limiting plate 404, and the spray head 503 is connected to the paint bucket 502, and the paint inside the paint bucket 502 is sprayed out through the spray head 503.

[0072] The nozzle 503 is also fixed on the limit plate 404 and passes through the limit plate 404. The nozzle 503 is placed toward the cylinder body. When the cylinder body 7 fails the inspection, the paint is sprayed toward the rear end (bottom surface) of the cylinder body 7 through the nozzle 503 to mark and remind, so as to facilitate subsequent operators to screen defective products.

[0073] The detection assembly 6 includes a mechanical arm 601, a contact sensor 602 and an in-position sensor 603. The mechanical arm 601 is fixed on the top plate of the platform assembly 1, and a contact sensor 602 (model GT-H10) is provided at the arm end of the mechanical arm 601. Preferably, the mechanical arm 601 is a three-axis six-degree-of-freedom mechanical arm, which can control the contact sensor 602 to move to any position in the cylinder.

[0074] After the cylinder body 7 to be inspected is placed, the robot arm 601 can carry the contact sensor 602 for inspection and move to various test points inside and outside the cylinder body, and cooperate with the contact sensor 602 to perform cylinder body position space calibration and size inspection.

[0075] The in-place sensor 603 is arranged on the top plate of the stand assembly 1 . The in-place sensor 603 is opposite to the cylinder body placement position. The in-place sensor 603 is used to determine whether the cylinder body 7 is placed on the bearing assembly 2 .

[0076] The device has two detection modes: automatic detection and manual detection. In the automatic detection mode, the cylinder body on the production line is automatically grabbed by an external robot and placed on the carrying component of the device. In the manual mode, the product is manually placed on the carrying component.

[0077] The aforementioned basic examples and their further selected examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed for protection in this application. In the scheme of this application, each selected example can be arbitrarily combined with any other basic examples and selected examples.

[0078] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A cylinder size detection method, characterized in that: The steps include: The first step is to place the cylinder: place the cylinder (7) in the cylinder placement position and fix it in position; The second step is position sampling: the outer surface of the cylinder (7) is divided into several sampling sections, and several sampling points are taken along the circumference of each sampling section. The position coordinates of the sampling points are obtained by the detection component (6); The third step is spatial calibration: the coordinates of the center of each sampling section are calculated from the sampling point position coordinates, and the coordinates of the center of all sampling sections are calculated jointly to obtain the cylindrical axis of the cylinder body (7); Step 4: detection sampling: a number of detection sections are divided inside the cylinder (7), and a number of detection points are taken along the circumference of each detection section, and the detection component (6) obtains the position coordinates of the detection points; The fifth step is to judge the size: the size parameters of the cylinder (7) are calculated by combining the position coordinates of the detection points with the cylindrical axis of the cylinder (7) to judge whether the size of the cylinder (7) is qualified.

2. The cylinder size detection method according to claim 1, characterized in that: The size parameters of the cylinder body (7) include inner wall diameter, inner wall roundness and inner wall straightness.

3. The cylinder size detection method according to claim 1, characterized in that: The cylinder body is placed as follows: the cylinder body (7) is placed on the cylinder body placement position of the bearing assembly (2). After being placed in place, the rear limit assembly (4) is started, and the rear limit assembly (4) pushes the cylinder body (7) forward until the cylinder body (7) contacts the front limit assembly (3), and the cylinder body (7) is clamped between the front limit assembly (3) and the rear limit assembly (4).

4. The cylinder size detection method according to claim 3, characterized in that: The detection method comprises a detection device, which comprises a platform assembly (1), a bearing assembly (2) being provided on the platform assembly (1), a front limit assembly (3) being provided on the platform assembly (1), the front limit assembly (3) being located at the front end of a cylinder body placement position, a movable rear limit assembly (4) being provided on the platform assembly (1), the rear limit assembly (4) being located at the rear end of the cylinder body placement position and being movable between a limit position and a release position, and a detection assembly (6) being provided on the platform assembly (1).

5. The cylinder size detection method according to claim 3 or 4, characterized in that: The bearing assembly (2) comprises a bearing base plate (201), which is detachably mounted on the platform assembly (1), and bearing brackets (202) are arranged on both sides of the bearing base plate (201), and the bearing inclined surfaces of the bearing brackets (202) on both sides are arranged opposite to each other.

6. The cylinder size detection method according to claim 3 or 4, characterized in that: An L-shaped limiting angle or limiting step is formed on the front limiting assembly (3), and the front limiting assembly (3) can be detachably mounted on the stand assembly (1) or the supporting assembly (2); the rear limiting assembly (4) includes a mounting plate (403) that slides along the front-rear direction, the mounting plate (403) is connected to the limiting plate (404), and a limiting vertical surface is formed on the limiting plate (404).

7. The cylinder size detection method according to claim 3 or 4, characterized in that: It also includes a paint spraying assembly (5), which is positioned toward the cylinder body; after the overall inspection process is completed, if the cylinder body size does not meet the production requirements, the paint spraying assembly (5) is started to spray paint on the cylinder body (7) to make a mark.

8. The cylinder size detection method according to claim 1, characterized in that: The detection component (6) includes a mechanical arm (601), and a contact sensor (602) is provided at the end of the mechanical arm (601). The mechanical arm (601) carries the contact sensor (602) for detection and moves to various points inside and outside the cylinder body. The mechanical arm (601) cooperates with the contact sensor (602) to obtain position coordinates; the contact sensor (602) extends the main axis of the sensor head to contact the cylinder body (7) in a low-pressure manner. At this time, the contact sensor (602) can capture the relative distance between it and the point, and at the same time, combined with the position moved by the mechanical arm (601), the relative spatial position coordinates of the point can be calculated.

9. The cylinder size detection method according to claim 3 or 4, characterized in that: The apparatus further comprises a human-machine interaction component, wherein the rear limit component (4), the paint spraying component (5) and the detection component (6) are all electrically connected to the human-machine interaction component; the human-machine interaction component is used to control the overall detection process, and the operator selects and configures the size of the cylinder to be tested, configures the detection points, starts the detection process, and generates and views the detection report in the human-machine interaction component; after the overall detection process is completed, the human-machine interaction component generates a detection report and stores it in the hard disk, and the detection report includes the detection time, test order number, material number, detection data and detection results.

10. The cylinder size detection method according to claim 9, characterized in that: The human-computer interaction component includes a temperature sensor, which is used to correct the test results. After collecting data in the early stage, the impact of temperature changes on the test is obtained. Before the test, a calibration test is performed with a standard cylinder and the correction value is calculated. The correction value is used to correct the subsequent test results and the correction value is reduced as the temperature rises until the impact of the external environment on the test results is negligible.

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