A hydraulic cylinder bore measuring system

Abstract

The present application relates to a kind of hydraulic cylinder bore measuring system, including base, column, rotary chuck assembly fixed on base and vertical sliding seat on column, rotary chuck assembly clamps the lower end of cylinder, the vertical support tube is fixed on the lower end of vertical sliding seat, measuring mechanism is mounted on support tube and moves up and down along support tube, the measuring mechanism includes sliding sleeve on support tube and multiple swing arms along the uniform distribution of sliding sleeve circumference, the upper end of swing arm is hinged with sliding sleeve, and roller is mounted on the lower end of swing arm, the measuring mechanism further includes sliding ring vertically sliding on sliding sleeve, swing arm is hinged with sliding ring by connecting arm, spring that drives sliding ring to move upwards is also mounted on sliding sleeve, the measuring mechanism further includes first laser ranging sensor for detecting the up and down position of sliding sleeve and second laser ranging sensor for detecting the up and down position of sliding ring.

Description

Technical Field

[0001] This invention relates to the field of measurement technology, specifically to a hydraulic cylinder bore measurement system. Background Technology

[0002] Hydraulic cylinders are core power actuators in engineering machinery, industrial equipment, and transportation. The machining accuracy, geometry (roundness, cylindricity), and wear condition of their inner bore (cylinder barrel) directly determine the cylinder's sealing performance, working efficiency, service life, and the reliability of the entire hydraulic system. Therefore, accurate and comprehensive measurement of the inner bore dimensions and morphology is crucial during the cylinder manufacturing process (such as precision boring and honing followed by inspection), pre-assembly inspection, and maintenance during service.

[0003] However, existing technologies have significant limitations and numerous technical challenges in measuring the inner bore of hydraulic cylinders:

[0004] 1. Traditional measurement methods (internal micrometer, three-point internal diameter gauge, etc.) can usually only measure the internal diameter of the cylinder end or near a limited depth (usually no more than a few hundred millimeters) at the port. For the middle section of the inner wall of a long-stroke cylinder, the measuring tool cannot reach or cannot operate stably.

[0005] 2. Continuous full-stroke measurement is not possible. Existing methods (such as using plug gauges or partial contact measurement) can only perform discrete point sampling measurements, and cannot obtain continuous dimensional change information of the cylinder inner bore along the entire axial length. This makes it difficult to accurately assess the pass rate of the cylinder inner diameter. For example, invention patents CN107131820B ("An Inner Hole Measuring Instrument") and CN102175117B ("An Inner Concave Hole Measuring Tool") can both measure the inner bore, but they are both measurements at a single location point.

[0006] 3. The measurement is inefficient and reliant on manual labor. When multi-point measurements are required, the process involves segmented measurements, repeated disassembly and assembly, and manual reading, which is time-consuming and labor-intensive. This is especially true for large or long-stroke hydraulic cylinders, resulting in long inspection cycles and high costs. Manual operation is prone to subjective errors, making it difficult to guarantee the repeatability and consistency of measurement results.

[0007] Therefore, the industry urgently needs a measurement technology that can overcome the above-mentioned defects and quickly, accurately and continuously acquire the dimensional and morphological information of the hydraulic cylinder bore along its entire axial length, so as to provide reliable data support for the quality control, condition monitoring and life assessment of the cylinder. Summary of the Invention

[0008] This invention addresses the shortcomings of existing technologies by providing a hydraulic cylinder bore measurement system.

[0009] This invention is achieved through the following technical solution: a hydraulic cylinder bore measurement system is provided, comprising a base, a column, a rotary chuck assembly fixed to the base, and a lifting seat slidably mounted vertically on the column. The rotary chuck assembly clamps the lower end of the cylinder. A vertical support tube is fixed to the lower end of the lifting seat. A measuring mechanism that moves up and down along the support tube is mounted on the support tube. The measuring mechanism includes a sliding sleeve fitted on the support tube and multiple swing arms evenly distributed along the circumference of the sliding sleeve. The upper end of each swing arm is hinged to the sliding sleeve, and a roller is mounted on the lower end of each swing arm. The measuring mechanism also includes a sliding ring slidably mounted vertically on the sliding sleeve. The swing arms are hinged to the sliding ring via connecting arms. A spring that drives the sliding ring to move upward is also mounted on the sliding sleeve. The measuring mechanism further includes a first laser ranging sensor for detecting the vertical position of the sliding sleeve and a second laser ranging sensor for detecting the vertical position of the sliding ring.

[0010] In this solution, the hydraulic cylinder to be measured is vertically fixed on a rotating chuck assembly, clamping its lower end. A lifting seat lowers the cylinder so that a support tube is inserted into it. During measurement, a spring drives the sliding ring to move upward relative to the sliding sleeve, and the swing arm swings outward until the roller at the lower end of the swing arm contacts the inner wall of the cylinder. A first laser rangefinder detects the vertical position of the sliding sleeve, and a second laser rangefinder detects the vertical position of the sliding ring. The difference in distance between these two sensors determines the vertical position of the sliding ring relative to the sliding sleeve, which corresponds to the swing angle of the swing arm and thus the diameter of the cylinder's inner bore. The measuring mechanism moves downward, thus determining the inner diameter of the cylinder at various positions during the movement, achieving the measurement of the cylinder's inner diameter at each location.

[0011] As an optimization, the system also includes a clamping sleeve vertically slidable on the support tube and a clamping cylinder for driving the clamping sleeve to rise and fall. A limiting tube is fixed to the lower end of the clamping sleeve. When the support tube is inserted into the cylinder, the upper end of the measuring mechanism moves into the limiting tube, and the inner hole of the limiting tube clamps the swing arm, causing it to swing towards the sliding sleeve, so that the lower end of the swing arm enters the cylinder. In this design, when the upper end of the measuring mechanism is in the limiting tube, the inner hole of the limiting tube clamps the swing arm, causing it to swing towards the sliding sleeve. The outer diameter formed by the multiple rollers is smaller than the inner diameter of the cylinder, thus allowing the rollers at the lower end of the swing arm to smoothly enter the cylinder.

[0012] As an optimization, both the first laser rangefinder and the second laser rangefinder are located at the upper end inside the limiting tube.

[0013] As an optimization, a rotating disk is rotatably connected to the outer ring of the clamping sleeve. The lower end of the rotating disk is tapered. After the support tube is inserted into the hydraulic cylinder, the upper end of the hydraulic cylinder rests against the tapered surface of the rotating disk. The rotating chuck assembly drives the hydraulic cylinder and the rotating disk to rotate, achieving coaxiality between the hydraulic cylinder and the support tube. In this solution, the lifting seat descends, pressing the tapered surface of the rotating disk against the upper end of the hydraulic cylinder. The lifting seat stops, and a clamping force is provided by the clamping cylinder. Then, the rotating chuck assembly drives the hydraulic cylinder and the rotating disk to rotate together. Through the clamping force of the clamping cylinder, the hydraulic cylinder is adjusted to a state where its axis is coaxial with the rotation axis.

[0014] As an optimization, the swing arm is provided with three arms, which are hinged to the upper end of the connecting arm and to the sliding ring at the lower end.

[0015] As an optimization, a convex ring is fixedly connected to the outer ring of the lower end of the sliding sleeve, and the spring is sleeved on the sliding sleeve and located between the convex ring and the sliding ring. The spring is installed through the convex ring.

[0016] As an optimization, a first laser receiving plate adapted to the first laser rangefinder is fixedly connected to the upper end of the sliding sleeve, and a second laser receiving plate adapted to the second laser rangefinder is fixedly connected to the upper end of the sliding ring. The first laser receiving plate receives the laser light from the first laser rangefinder, and the second laser receiving plate receives the laser light from the second laser rangefinder.

[0017] As an optimization, the support tube has a vertical guide groove, and a boss that inserts into the guide groove is fixedly connected to the inner ring of the sliding sleeve. A drive screw is rotatably connected inside the support tube, and the boss is threadedly connected to the drive screw. A drive motor that drives the drive screw to rotate is mounted on the lifting seat. In this solution, the vertical sliding of the sliding sleeve is achieved by the vertical sliding of the boss in the guide groove, and the lifting operation of the sliding sleeve is achieved by the threaded connection between the drive screw and the boss.

[0018] As an optimization, a lifting motor is fixedly connected to the lifting base, a gear is fixedly connected to the shaft of the lifting motor, and a rack that meshes with the gear is fixedly connected to the column.

[0019] As an optimization, the rotary chuck assembly includes a support housing fixed to the base, a rotary tube axially connected within the support housing, and a chuck rotary motor that drives the rotary tube to rotate. A chuck is fixed to the upper end of the rotary tube, and the chuck has a through hole coaxial with the rotary tube at its center. In this design, the rotary tube drives the chuck to rotate, and the through hole in the center of the chuck facilitates the passage of the support tube. Therefore, when inspecting shorter hydraulic cylinders, the support tube can pass downwards through the rotary chuck assembly.

[0020] The beneficial effects of this invention are as follows:

[0021] By moving the measuring mechanism up and down inside the cylinder, precise measurement at any position throughout the entire stroke is achieved, completely solving the pain points of limited depth and position measurement in existing technologies. A single installation completes the scanning measurement of the entire stroke, significantly shortening the inspection time. A high-precision laser rangefinder sensor ensures high accuracy of the measurement results.

[0022] It breaks through the limitations of existing technologies in terms of depth and continuity, and achieves efficient, accurate and comprehensive evaluation of internal hole dimensions and morphology, providing a powerful technical tool for improving the manufacturing quality of hydraulic cylinders, ensuring the reliability of equipment operation, and optimizing maintenance strategies. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a front view of the present invention;

[0025] Figure 3 This is a right view of the present invention;

[0026] Figure 4 This is a top view of the present invention;

[0027] Figure 5 When in the preparation state for the present invention Figure 2 Sectional view of plane AA;

[0028] Figure 6 For the present invention Figure 5 A magnified view of the location of the measuring mechanism in the middle;

[0029] Figure 7 For the present invention Figure 6 Sectional view of the middle BB surface;

[0030] Figure 8 For the present invention Figure 6 Sectional view of the C-plane;

[0031] Figure 9 This is a schematic diagram of the measuring mechanism of the present invention;

[0032] Figure 10 This is a front view of the measuring mechanism of the present invention;

[0033] Figure 11 This is a top view of the measuring mechanism of the present invention;

[0034] Figure 12 When the rotary disc clamping cylinder end state of the present invention Figure 2 Sectional view of plane AA;

[0035] Figure 13 For the present invention Figure 12 A magnified view of the location of the measuring mechanism in the middle;

[0036] Figure 14 When the measurement state of the present invention is Figure 2 Sectional view of plane AA;

[0037] Figure 15 For the present invention Figure 14 A magnified view of the location of the measuring mechanism in the middle;

[0038] Figure 16 For the present invention Figure 14 A partial enlarged view of the rotary chuck assembly;

[0039] As shown in the figure:

[0040] 1. Base, 2. Column, 3. Hydraulic cylinder, 4. Rotary chuck assembly, 41. Chuck, 42. Support housing, 43. Rotary tube, 44. Transmission belt, 45. Chuck rotary motor, 5. Measuring mechanism, 51. Sliding sleeve, 52. Swing arm, 53. Connecting arm, 54. Roller, 55. Sliding ring, 56. Spring, 57. First laser receiving plate, 58. Second laser receiving plate, 59. Boss, 6. Lifting seat, 7. Lifting motor, 8. Support tube, 9. Drive screw, 10. Drive motor, 11. Clamping sleeve, 12. Clamping cylinder, 13. Rotary disk, 14. Limiting tube, 15. First laser ranging sensor, 16. Second laser ranging sensor, 17. Gear, 18. Rack. Detailed Implementation

[0041] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0042] like Figures 1-16 As shown, a hydraulic cylinder bore measurement system of the present invention includes a base 1, a column 2, a rotary chuck assembly 4 fixed on the base 1, and a lifting seat 6 vertically slidably connected to the column 2. The rotary chuck assembly 4 clamps the lower end of the cylinder 3. The base 1 is fixed on the ground. Two columns 2 are provided and arranged side by side. The lower end of the columns is welded to the base 1 to achieve column fixation.

[0043] The rotary chuck assembly 4 is used to clamp the hydraulic cylinder 3 and can drive the hydraulic cylinder 3 to rotate, such as Figure 16 As shown, the rotary chuck assembly 4 includes a support housing 42 fixed to the base 1, a rotary tube 43 axially connected to the support housing 42, and a chuck rotary motor 45 that drives the rotary tube 43 to rotate. The axis of the rotary tube 43 is vertically arranged, and the chuck rotary motor 45 drives the rotary tube 43 to rotate through a transmission belt 44.

[0044] The upper end of the rotating tube 43 is fixedly connected to a chuck 41. The chuck is a purchased finished chuck, generally a three-jaw chuck or a four-jaw chuck. In this embodiment, the chuck 41 has a through hole in the center that is coaxial with the rotating tube 43, so that the support tube can pass through. Thus, when testing a shorter hydraulic cylinder, the support tube can pass downward through the rotating chuck assembly.

[0045] The lifting platform 6 has four sliders mounted on its side, and the column 2 has corresponding slide rails on its side, thus guiding the lifting platform 6. To achieve the automatic lifting action of the lifting platform 6, as follows... Figure 4 As shown, a lifting motor 7 is fixedly connected to the lifting base 6, a gear 17 is fixedly connected to the shaft of the lifting motor 7, and a rack 18 that meshes with the gear 17 is fixedly connected to the column 2. The rack 18 is vertically fixed to one of the supports 2, so that the lifting base 6 is driven to lift by the rotation of the gear.

[0046] The lower end of the lifting seat 6 is fixedly connected to a vertical support tube 8, and a measuring mechanism 5 that moves up and down along the support tube 8 is mounted on the support tube 8. The reason for setting the lifting seat 6 to be able to lift is to insert the support rod 8 into the upper end of the oil cylinder 3, so that the measuring mechanism 5 can measure the inner diameter of the oil cylinder 3 at various positions inside the oil cylinder 3.

[0047] like Figure 9-11 As shown, the measuring mechanism 5 includes a sliding sleeve 51 sleeved on the support tube 8 and multiple swing arms 52 evenly distributed around the sliding sleeve 51. The sliding sleeve 51 is vertically slidable on the support tube 8, and the lifting and lowering of the entire measuring mechanism 5 is achieved by the lifting and lowering of the sliding sleeve 51.

[0048] like Figure 10 As shown, the upper end of the swing arm 52 is hinged to the sliding sleeve 51, allowing it to swing towards or away from the sliding sleeve 51. The lower end of the swing arm 52 is equipped with a roller 54, the purpose of which is to allow the roller 54 to adhere to the inner wall of the cylinder. Figure 11 As can be seen, the cross-section of the roller 54 in this embodiment is circular, and its radius is smaller than that of the oil cylinder, so that the contact between the roller 54 and the inside of the oil cylinder is a point contact, which can achieve accurate measurement.

[0049] like Figure 10As shown, the measuring mechanism 5 also includes a sliding ring 55 vertically slidable on the sliding sleeve 51. In this embodiment, three swing arms 52 are provided. The swing arms 52 are hinged to the sliding ring 55 via connecting arms 53. Specifically, the upper end of the connecting arm 53 is hinged to the swing arm 52, and the lower end of the connecting arm 53 is hinged to the sliding ring 55. Thus, the swing of the swing arm 52 can drive the sliding ring 55 to slide up and down relative to the sliding sleeve 51. Therefore, by detecting the vertical position of the sliding ring 55 relative to the sliding sleeve 51, the swing angle of the swing arm 52 can be obtained, which corresponds to the inner diameter of the hydraulic cylinder.

[0050] The sliding sleeve 51 is also equipped with a spring 56 that drives the sliding ring 55 to move upward. In this embodiment, a convex ring is fixed to the outer ring at the lower end of the sliding sleeve 51. The spring 56 is sleeved on the sliding sleeve 51 and located between the convex ring and the sliding ring 55. Thus, the spring 56 drives the sliding ring 55 to move upward, which in turn drives the swing arm 52 to swing outward. On the one hand, the roller 54 is made to fit against the inner wall of the oil cylinder to achieve accurate measurement. On the other hand, by nailing the three rollers 54 to the inner wall of the oil cylinder, the sliding sleeve 51 and the oil cylinder can be made to be precisely coaxial, thereby improving the accuracy of the measurement.

[0051] The measuring mechanism 5 also includes a first laser rangefinder 15 for detecting the vertical position of the sliding sleeve 51 and a second laser rangefinder 16 for detecting the vertical position of the sliding ring 55. Both the first laser rangefinder 15 and the second laser rangefinder 16 are high-precision laser sensors, ensuring high detection accuracy.

[0052] The upper end of the sliding sleeve 51 is fixedly connected to a first laser receiving plate 57 adapted to the first laser rangefinder 15, which receives the laser light from the first laser rangefinder. The upper end of the sliding ring 55 is fixedly connected to a second laser receiving plate 58 adapted to the second laser rangefinder 16, which receives the laser light from the second laser rangefinder.

[0053] To achieve the sliding and lifting movements of the support tube 8, such as Figure 8 As shown, the support tube 8 has a vertical guide groove, and the inner ring of the sliding sleeve 51 is fixed with a boss 59 that is inserted into the guide groove. The support tube 8 is rotatably connected with a drive screw 9, and the boss 59 is threadedly connected to the drive screw 9. The lifting seat 6 is equipped with a drive motor 10 that drives the drive screw 9 to rotate. Therefore, the vertical sliding of the sliding sleeve is realized by the vertical sliding of the boss in the guide groove, and the lifting operation of the sliding sleeve is realized by the threaded connection between the drive screw and the boss.

[0054] like Figure 6As shown, it also includes a clamping sleeve 11 that slides vertically on the support tube 8 and a clamping cylinder 12 that drives the clamping sleeve 11 to rise and fall. The clamping sleeve 11 is fitted at the upper end of the support tube 8. There are two clamping cylinders 12, which are symmetrically arranged on both sides of the clamping sleeve 11. The clamping sleeve 11 is driven to rise and fall by the two clamping cylinders 12.

[0055] The inner diameter of the clamping sleeve 11 is equal to the outer diameter of the support tube 8. The lower end of the clamping sleeve 11 is fixedly connected to the limiting tube 14. The outer diameter of the limiting tube 14 is equal to the outer diameter of the clamping sleeve 11, and the inner diameter of the limiting tube 14 is greater than the outer diameter of the support tube 8. More specifically, the inner diameter of the limiting tube 14 is greater than the outer diameter of the sliding sleeve 51.

[0056] When the support tube 8 is inserted into the oil cylinder 3, the upper end of the measuring mechanism 5 moves into the limiting tube 14. The inner diameter of the limiting tube 14 presses the swing arm 52, causing it to swing towards the sliding sleeve 51. The outer diameter formed by multiple rollers is smaller than the inner diameter of the oil cylinder, thus allowing the lower end of the swing arm 52 to smoothly enter the oil cylinder 3.

[0057] In this embodiment, both the first laser rangefinder 15 and the second laser rangefinder 16 are located at the upper end of the limiting tube 14.

[0058] The outer ring of the clamping sleeve 11 is rotatably connected to a rotating disk 13. The lower end of the rotating disk 13 is a conical surface. After the support tube 8 is inserted into the oil cylinder 3, the upper end of the oil cylinder 3 rests on the conical surface of the rotating disk 13. The rotating chuck assembly 4 drives the oil cylinder 3 and the rotating disk 13 to rotate, thereby achieving coaxiality between the oil cylinder 3 and the support tube 8.

[0059] Method of using this invention:

[0060] During measurement, such as Figure 1-6 As shown, the cylinder 3 to be measured is vertically fixed on the rotating chuck assembly 4, and the lower end of the cylinder 3 is clamped. The drive motor 10 rotates, and the lifting seat 6 is driven to descend through the gear 17 and rack 18, so that the support tube 8 is inserted into the cylinder 3. At this time, since the upper end of the measuring mechanism 5 is located in the limiting tube 14, the inner hole of the limiting tube 14 presses the swing arm 52, causing it to swing towards the sliding sleeve 51. The outer diameter of the multiple rollers 54 is smaller than the inner diameter of the cylinder 3, so that the rollers 54 at the lower end of the swing arm 52 can smoothly enter the cylinder 3. During this process, the clamping cylinder 12 remains in an extended state. The lowering of the lifting seat 6 causes the conical surface of the rotating disk 13 to press against the upper end of the cylinder 3. The lifting seat 6 stops, and the clamping force is provided by the clamping cylinder 12. Then the rotating chuck assembly 4 drives the cylinder 3 and the rotating disk 13 to rotate together. Through the clamping force of the clamping cylinder 12, the cylinder 3 is adjusted to a state where the axis is coaxial with the rotation axis. At this time, the cylinder 3 is coaxial with the support tube 8. Figure 12 , 13 As shown, then proceed to the formal measurement.

[0061] During formal measurements, such as Figure 14 , 15 As shown, the drive motor 10 drives the drive screw 9 to rotate. Through the threaded connection between the drive screw 9 and the inner ring boss 59 of the sliding sleeve 51, and the guiding effect of the guide groove on the support tube 8 on the boss 59, the sliding sleeve 51 moves downward, the swing arm 52 separates from the inner hole of the limiting tube 14, and the spring 56 drives the sliding ring 55 to move upward relative to the sliding sleeve 51. The swing arm 52 swings outward until the roller 54 at the lower end of the swing arm 52 is in contact with the inner wall of the oil cylinder 3. Then the clamping cylinder 12 drives the rotating disk 13 to move upward and separate from the oil cylinder 3, so that the upper end of the oil cylinder 3 is in a floating state.

[0062] Because the coaxial accuracy between the hydraulic cylinder 3 and the support tube 8 is low, a very precise coaxial state cannot be achieved. Therefore, three swing arms 52 are pressed against the inner wall of the hydraulic cylinder 3 to achieve better coaxiality between the hydraulic cylinder 3 and the support tube 8. Since the upper end of the support tube 8 is fixed and the lower end is floating, and the lower end of the hydraulic cylinder 3 is fixed and the upper end is floating, the hydraulic cylinder 3 achieves precise coaxiality with the support tube 8 through elastic deformation near the upper part of the hydraulic cylinder 3, and the hydraulic cylinder 3 achieves precise coaxiality with the support tube 8 through elastic deformation near the lower part of the hydraulic cylinder 3. This achieves precise coaxiality and better measurement results.

[0063] After the rollers 54 of the three swing arms 52 are in contact with the inner wall of the cylinder 3, the upper and lower positions of the sliding sleeve 51 are detected by the first laser rangefinder 15 and the upper and lower positions of the sliding ring 55 are detected by the second laser rangefinder 16. The upper and lower positions of the sliding ring 55 relative to the sliding sleeve 51 can be obtained by the distance difference between the two, which corresponds to the swing angle of the swing arm 52, and thus corresponds to the diameter of the inner hole of the cylinder 3. The correspondence between the upper and lower position difference of the sliding ring 55 relative to the sliding sleeve 51 and the inner diameter of the cylinder 3 is preset in the control system (the specific correspondence can be obtained through multiple experiments and stored in the control system). Thus, the inner diameter of the cylinder 3 at this position can be automatically obtained. Then, the drive screw 9 is rotated by the drive motor 10, causing the measuring mechanism 5 to move downward, thereby obtaining the inner diameter of the cylinder at each position during the movement, realizing the measurement of the inner diameter of the cylinder at each position.

[0064] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A hydraulic cylinder bore measurement system, characterized in that: The system includes a base (1), a column (2), a rotary chuck assembly (4) fixed to the base (1), and a lifting seat (6) vertically slidably connected to the column (2). The rotary chuck assembly (4) clamps the lower end of the hydraulic cylinder (3). The lower end of the lifting seat (6) is fixedly connected to a vertical support tube (8). A measuring mechanism (5) that moves up and down along the support tube (8) is mounted on the support tube (8). The measuring mechanism (5) includes a sliding sleeve (51) sleeved on the support tube (8) and multiple swing arms (52) evenly distributed around the circumference of the sliding sleeve (51). The upper end of the swing arms (52) is connected to the sliding sleeve (51). The movable sleeve (51) is hinged, and the lower end of the swing arm (52) is equipped with a roller (54). The measuring mechanism (5) also includes a sliding ring (55) that slides vertically on the sliding sleeve (51). The swing arm (52) is hinged to the sliding ring (55) through a connecting arm (53). The sliding sleeve (51) is also equipped with a spring (56) that drives the sliding ring (55) to move upward. The measuring mechanism (5) also includes a first laser ranging sensor (15) that detects the vertical position of the sliding sleeve (51) and a second laser ranging sensor (16) that detects the vertical position of the sliding ring (55). It also includes a clamping sleeve (11) that slides vertically on the support tube (8) and a clamping cylinder (12) that drives the clamping sleeve (11) to rise and fall. The lower end of the clamping sleeve (11) is fixedly connected to a limit tube (14). When the support tube (8) is inserted into the oil cylinder (3), the upper end of the measuring mechanism (5) moves into the limit tube (14). The inner hole of the limit tube (14) clamps the swing arm (52) so that it swings towards the sliding sleeve (51) so that the lower end of the swing arm (52) enters the oil cylinder (3). The outer ring of the clamping sleeve (11) is rotatably connected to a rotating disk (13). The lower end of the rotating disk (13) is a conical surface. After the support tube (8) is inserted into the oil cylinder (3), the upper end of the oil cylinder (3) rests on the conical surface of the rotating disk (13). The rotating chuck assembly (4) drives the oil cylinder (3) and the rotating disk (13) to rotate, thereby achieving the coaxiality of the oil cylinder (3) and the support tube (8).

2. The hydraulic cylinder bore measurement system according to claim 1, characterized in that: The first laser rangefinder (15) and the second laser rangefinder (16) are both located at the upper end of the limiting tube (14).

3. The hydraulic cylinder bore measurement system according to claim 1, characterized in that: The swing arm (52) is provided in three parts, which are hinged to the upper end of the connecting arm (53) and hinged to the sliding ring (55) at the lower end.

4. The hydraulic cylinder bore measurement system according to claim 1, characterized in that: The outer ring of the lower end of the sliding sleeve (51) is fixedly connected to a convex ring, and the spring (56) is sleeved on the sliding sleeve (51) and located between the convex ring and the sliding ring (55).

5. The hydraulic cylinder bore measurement system according to claim 1, characterized in that: The upper end of the sliding sleeve (51) is fixedly connected to a first laser receiving plate (57) adapted to the first laser ranging sensor (15), and the upper end of the sliding ring (55) is fixedly connected to a second laser receiving plate (58) adapted to the second laser ranging sensor (16).

6. The hydraulic cylinder bore measurement system according to claim 1, characterized in that: The support tube (8) has a vertical guide groove, and the inner ring of the sliding sleeve (51) is fixed with a boss (59) that is inserted into the guide groove. The support tube (8) is rotatably connected with a drive screw (9). The boss (59) is threadedly connected to the drive screw (9). The lifting seat (6) is equipped with a drive motor (10) that drives the drive screw (9) to rotate.

7. The hydraulic cylinder bore measurement system according to claim 1, characterized in that: A lifting motor (7) is fixedly connected to the lifting seat (6), a gear (17) is fixedly connected to the shaft of the lifting motor (7), and a rack (18) that meshes with the gear (17) is fixedly connected to the column (2).

8. The hydraulic cylinder bore measurement system according to claim 1, characterized in that: The rotary chuck assembly (4) includes a support housing (42) fixed to the base (1), a rotary tube (43) axially connected to the support housing (42), and a chuck rotary motor (45) that drives the rotary tube (43) to rotate. A chuck (41) is fixed to the upper end of the rotary tube (43), and a through hole coaxial with the rotary tube (43) is opened in the center of the chuck.

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