A cylinder liner piston surface crack detection device

Abstract

The application relates to a cylinder liner piston surface crack detection device, and relates to the field of cylinder liner piston crack detection equipment.The device comprises a workbench, a feeding device, a material taking device, a detection device and a feeding device, wherein the feeding device, the material taking device, the detection device and the feeding device are all installed on the workbench, the feeding device, the detection device and the feeding device are sequentially installed on the workbench in the horizontal direction, the material taking device comprises a horizontal driving element, a material taking cylinder, a material taking table and material taking suction cups, the horizontal driving element is installed on the workbench, the material taking cylinder is installed on the horizontal driving element, the material taking cylinder is driven to move in the horizontal direction by the horizontal driving element, the material taking table is fixedly connected with a piston rod of the material taking cylinder, and the material taking suction cups are provided with two groups and are installed on the two sides of the material taking table respectively and are respectively used for discharging and feeding work.The application has the effects of further improving positioning accuracy and improving detection efficiency.

Description

Technical Field

[0001] This application relates to the field of cylinder liner and piston crack detection equipment, and in particular to a cylinder liner and piston surface crack detection device. Background Technology

[0002] The piston surface crack detector is a precision instrument specifically designed to detect minute cracks, defects, or fatigue damage on the surface of engine cylinder liners and pistons. Its core function is to prevent engine failures and ensure safe equipment operation. It is primarily used in the manufacturing and maintenance of internal combustion engines or hydraulic systems in the automotive, shipbuilding, aviation, and construction machinery industries.

[0003] In existing crack detection technologies, various pressure roller devices are typically used to achieve positioning and guiding functions in order to ensure stable contact and uniform scanning motion between the workpiece and the sensor. These devices mainly include simple spring-loaded structures, manually adjustable mechanical pressure rollers, and pneumatically driven single-bar mechanisms.

[0004] The aforementioned conventional methods still have certain limitations in practical applications, especially in multi-station collaborative operations. Achieving precise transfer and positioning of workpieces between different processes is a pressing issue. Current technologies lack a complete solution that efficiently integrates loading, unloading, inspection, and feeding processes, resulting in low inspection efficiency and a tendency for positioning errors, thus affecting the accuracy of the final inspection results. Summary of the Invention In order to further improve positioning accuracy and detection efficiency, this application provides a cylinder liner piston surface crack detection device.

[0005] The cylinder liner piston surface crack detection device provided in this application adopts the following technical solution: A cylinder liner piston surface crack detection device includes a workbench, a loading device, a picking device, a detection device, and a feeding device. The loading device, picking device, detection device, and feeding device are all mounted on the workbench. The loading device, detection device, and feeding device are sequentially mounted on the workbench in a horizontal direction. The picking device includes a horizontal drive component, a picking cylinder, a picking platform, and picking suction cups. The horizontal drive component is mounted on the workbench, and the picking cylinder is mounted on the horizontal drive component. The horizontal drive component drives the picking cylinder to move in a horizontal direction. The picking platform is fixedly connected to the piston rod of the picking cylinder. Two sets of picking suction cups are provided, respectively mounted on both sides of the picking platform, for unloading and loading operations.

[0006] By adopting the above technical solution, the automated loading and unloading function of the cylinder liner piston surface crack detection device was realized. The workbench, as the basic platform of the entire device, ensures the stable installation and coordinated operation of all components. The loading device, detection device, and feeding device are arranged sequentially along the horizontal direction, optimizing the workpiece flow path and improving detection efficiency. The picking device, driven by a horizontal drive component, moves the picking cylinder horizontally, enabling precise control of the picking position and ensuring accurate workpiece positioning. Two sets of picking suction cups are installed on the picking platform, used for unloading and loading respectively, effectively improving the device's operational flexibility and production cycle time.

[0007] In one specific implementation scheme, the feeding device includes a feeding conveyor belt, positioning components, and measuring rulers. The feeding conveyor belt is installed on a workbench. Two sets of limiting components are provided and are respectively installed on both sides of the feeding conveyor belt near the detection device. The limiting components include limiting cylinders and limiting plates. The limiting cylinders are installed on the feeding conveyor belt, and the moving direction of the limiting cylinders is set perpendicular to the feeding direction of the feeding conveyor belt. The limiting plates are fixedly connected to the piston rods of the limiting cylinders. The measuring rulers are installed on both sides of the feeding conveyor belt at one end of the limiting cylinders.

[0008] By adopting the above technical solutions, the feeding conveyor belt can automatically complete the transfer of workpieces to be inspected, improving work efficiency. The limiting cylinder and limiting plate in the limiting components work together to achieve precise positioning of the workpieces to be inspected, ensuring that the workpieces are in the correct position before inspection, thereby improving inspection accuracy. The measuring ruler facilitates operators to verify the dimensions of the workpieces, further ensuring the accuracy of the inspection.

[0009] In one specific implementation scheme, the system also includes sensors, which are provided in two sets. The two sensors are respectively installed at one end of the feeding conveyor belt near the detection device and at the middle part of the feeding conveyor belt. The number of workpieces to be detected on the feeding conveyor belt is determined by the two sensors.

[0010] By adopting the above technical solution, the sensor configuration enables accurate determination of the number of workpieces to be inspected on the feeding conveyor belt. Specifically, two sets of sensors are installed at different positions on the feeding conveyor belt, which can monitor the distribution of workpieces in real time, thereby effectively avoiding detection interruptions or equipment failures caused by abnormal workpiece quantities, and improving detection efficiency and reliability.

[0011] In one specific implementation, the detection device includes a positioning component, a lifting cylinder, a lifting seat, a sliding cylinder, a sliding seat, a detection motor, and a detection head. The positioning component is installed between the loading device and the feeding device. The lifting cylinder is installed on the workbench. The lifting seat is connected to the piston rod of the lifting cylinder. The sliding cylinder is installed on the lifting seat. The sliding seat is connected to the piston rod of the sliding cylinder. The detection motor is installed on the sliding seat. The detection head is installed on the output shaft of the sliding cylinder.

[0012] By adopting the above technical solutions, the positioning components ensure stable positioning of the workpiece during the inspection process, improving inspection accuracy; the combined use of the lifting cylinder and the lifting seat allows the inspection head to be flexibly adjusted in the vertical direction to adapt to the inspection needs of workpieces of different heights; the combination of the sliding cylinder and the sliding seat enables the inspection head to move in the horizontal direction, ensuring comprehensive coverage of the inspection range; the inspection motor drives the inspection head to perform efficient and stable inspection operations, improving inspection efficiency and accuracy.

[0013] In one specific implementation, the positioning component includes a positioning seat, a rotary motor, and positioning rollers. The positioning seat is mounted on a workbench. Two sets of rotary motors and positioning rollers are provided. The rotary motors are mounted side by side on the positioning seat. The two positioning rollers are respectively positioned corresponding to the rotary motors and are fixedly connected to the output shaft of the rotary motors. The workpiece to be inspected is mounted between the two positioning rollers and can be driven to rotate by the rotation of the positioning rollers.

[0014] By adopting the above technical solution, the positioning component includes a positioning seat, a rotary motor, and positioning rollers. Two sets of rotary motors drive the corresponding positioning rollers to rotate. The workpiece to be inspected is installed between the two positioning rollers, which enables stable clamping and precise rotation of the workpiece. This design allows the inspection device to scan the workpiece surface from all directions, improving the coverage and accuracy of crack detection, while reducing manual intervention and improving inspection efficiency.

[0015] In one specific implementation, a side positioning assembly is also included, which includes a mounting bracket, a limiting cylinder, a linkage mechanism, and a limiting rod. The mounting bracket is mounted on a workbench, the limiting cylinder is mounted on the mounting bracket, and the limiting rod is mounted on the piston rod of the limiting cylinder via the linkage mechanism. A limiting roller is mounted on the limiting rod.

[0016] By adopting the above technical solution, the side positioning component effectively limits the radial displacement of the workpiece during the inspection process, improving inspection accuracy and stability. The mounting bracket provides a stable base for the limiting cylinder, which drives the limiting rod through a linkage mechanism, enabling the limiting roller to accurately contact the workpiece, thereby achieving lateral positioning. This structural design not only ensures the workpiece's position is fixed during inspection but also avoids surface damage caused by direct contact, while simultaneously improving inspection efficiency and reliability.

[0017] In one specific implementation scheme, the linkage mechanism includes a first link and a second link, a support plate is mounted on the limiting cylinder, a support block is mounted on the support plate, one end of the first link is hinged to the support block, the other end of the first link is hinged to the limiting rod, one end of the second link is hinged to the piston rod of the limiting cylinder, and the other end of the second link is hinged to one end of the limiting rod.

[0018] By adopting the above technical solution, a stable linkage mechanism is formed through the cooperation of the first and second linkages. This mechanism can convert the linear motion of the limit cylinder into precise position adjustment of the limit rod, improving the reliability of lateral positioning of the workpiece. The support plate and support block provide a stable hinge point for the first linkage, enhancing the overall stability of the mechanism and avoiding positioning deviations caused by external forces. The linkage mechanism is compact in design, occupies little space, and facilitates complex motion conversion in a narrow working area, thus improving the space utilization of the equipment.

[0019] In one specific implementation scheme, it further includes a first axis positioning cylinder, a second axis positioning cylinder, a first positioning rod, and a second positioning rod. The first positioning cylinder and the second positioning cylinder are respectively installed on both sides of the axis of the workpiece to be tested. The first positioning rod is installed on the piston rod of the first axis positioning cylinder, and the second positioning rod is installed on the piston rod of the second axis positioning cylinder. A positioning plate is installed on the first positioning rod, and a positioning roller is installed on the second positioning rod.

[0020] By adopting the above technical solution, the first and second axis positioning cylinders are respectively installed on both sides of the axis of the workpiece to be inspected, enabling precise axial positioning of the workpiece. The positioning disc on the first positioning rod and the positioning roller on the second positioning rod contact the workpiece from different directions, effectively preventing the workpiece from shifting or shaking during the inspection process, thereby improving inspection accuracy and stability. This design is particularly suitable for crack inspection scenarios requiring high-precision positioning, ensuring the reliability of the inspection results.

[0021] In one specific implementation, the positioning roller is provided with a keyway, which is used to increase the friction between the workpiece to be inspected and the positioning roller.

[0022] By adopting the above technical solution, the keyway increases the friction between the workpiece to be tested and the positioning roller, thereby improving the stability and transmission efficiency between the workpiece and the positioning roller during the testing process, effectively avoiding the problem of workpiece slippage or positional deviation, and ensuring the accuracy and reliability of the test results.

[0023] In one specific implementation, a recycling rack is also included, which is installed between the feeding device and the detection device, and the recycling rack is inclined downward along the side adjacent to the feeding device to the side away from the feeding device.

[0024] By adopting the above technical solution, the recycling rack can effectively collect waste or defective products generated during the testing process, preventing them from scattering inside the equipment and causing pollution or damage. The downward-sloping recycling rack utilizes gravity to allow waste or defective products to automatically slide into the designated collection area, improving the cleaning efficiency and maintenance convenience of the equipment while reducing the workload of manual cleaning.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. Through the coordinated operation of the loading device, unloading device, detection device and feeding device, the entire process of workpiece loading, detection and feeding is automated, which significantly improves detection efficiency and reduces errors caused by manual intervention; 2. The material handling device adopts a combination of horizontal drive components and material handling cylinders, which can accurately control the material handling position, ensure the stable transfer of workpieces between different processes, and effectively avoid positioning deviation problems; 3. The lifting cylinder and sliding cylinder in the detection device are used in conjunction with the detection head to achieve all-round, high-precision scanning and detection of the workpiece surface, thereby improving the accuracy and reliability of crack detection. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the structure of an embodiment of this application that is not installed on the workbench.

[0028] Figure 3 for Figure 1 Enlarged view of part A in the middle.

[0029] Figure 4 This is a schematic diagram of the side positioning component.

[0030] Explanation of reference numerals in the attached drawings: 1. Workbench; 2. Feeding device; 21. Feeding conveyor belt; 22. Limiting component; 221. Limiting cylinder; 222. Limiting plate; 23. Measuring ruler; 24. Sensor; 3. Picking device; 31. Horizontal drive component; 32. Picking cylinder; 33. Picking platform; 34. Picking suction cup; 4. Detection device; 41. Positioning component; 47. Positioning seat; 412. Rotary motor; 413. Positioning roller; 42. Lifting cylinder; 43. Lifting seat; 44. Sliding cylinder; 45. Sliding seat; 46. Detection motor; 47. Detection head; 5. Feeding device; 6. Side positioning assembly; 61. Mounting bracket; 62. Positioning cylinder; 63. Linkage mechanism; 64. Limiting rod; 7. Recycling rack. Detailed Implementation

[0031] This application discloses a device for detecting surface cracks in cylinder liners and pistons.

[0032] like Figure 1-2 As shown, the cylinder liner piston surface crack detection device 4 includes a workbench 1, a loading device 2, a picking device 3, and a feeding device 5. The loading device 2, detection device 4, and feeding device 5 are sequentially mounted horizontally on the workbench 1. The picking device 3 includes a horizontal drive component 31, a picking cylinder 32, a picking platform 33, and a picking suction cup 34. The horizontal drive component 31 is mounted on the workbench 1, and the picking cylinder 32 is mounted on the horizontal drive component 31, driving the picking cylinder 32 to move horizontally. The picking platform 33 is fixedly connected to the piston rod of the picking cylinder 32. Two sets of picking suction cups 34 are provided, installed on both sides of the picking platform 33, for unloading and loading respectively. This structural design makes the transfer of workpieces between different processes more stable and efficient, avoiding positioning deviation problems and significantly improving the stability and accuracy of the detection process. The feeding mechanism can adopt a general conveyor belt mechanism.

[0033] The feeding device 2 includes a feeding conveyor belt 21, limiting components 22, and measuring scales 23. The feeding conveyor belt 21 is installed on the workbench 1. Two sets of limiting components 22 are symmetrically installed on both sides of the feeding conveyor belt 21 adjacent to the detection device 4. Each limiting component 22 includes a positioning cylinder 221 and a limiting plate 222. The positioning cylinder 221 is installed on the feeding conveyor belt 21, and its movement direction is perpendicular to the feeding direction of the feeding conveyor belt 21. The limiting plate 222 is fixedly connected to the piston rod of the positioning cylinder 221. Two sets of measuring scales 23 are symmetrically installed on both sides of the feeding conveyor belt 21 at one end of the positioning cylinder 221. The positioning cylinder 221 can be a single-acting cylinder or a double-acting cylinder. The limiting plate 222 can be made of metal materials such as aluminum alloy or stainless steel, and its surface is anodized to improve wear resistance. The measuring scale 23 can be a ruler or a laser rangefinder, used to accurately measure the size and position of the workpiece to be inspected. The design of the positioning component 41 not only enables precise positioning of the workpiece, but also adapts to the needs of workpieces of different sizes, thus improving the versatility of the device.

[0034] like Figure 3 As shown in the embodiment of this application, sensors 24 are also included. Two sets of sensors 24 are provided, one at the end of the feeding conveyor belt 21 adjacent to the detection device 4 and the other in the middle of the feeding conveyor belt 21. The two sensors 24 determine the number of workpieces to be detected on the feeding conveyor belt 21. Sensors 24 can be photoelectric sensors or ultrasonic sensors, and their sensitivity can be adjusted according to actual needs. Photoelectric sensors are suitable for detecting transparent or semi-transparent workpieces, while ultrasonic sensors are more suitable for detecting opaque workpieces. This design allows for real-time monitoring of the feeding process, ensuring the smooth progress of the detection process and preventing overloading that could cause workpieces to fall off.

[0035] The detection device 4 includes a positioning component 41, a lifting cylinder 42, a lifting seat 43, a sliding cylinder 44, a sliding seat 45, a detection motor 46, and a detection head 47. The positioning component 41 is installed between the loading device 2 and the feeding device 5. The lifting cylinder 42 is installed on the workbench 1. The lifting seat 43 is connected to the piston rod of the lifting cylinder 42. The sliding cylinder 44 is installed on the lifting seat 43. The sliding seat 45 is connected to the piston rod of the sliding cylinder 44. The detection motor 46 is installed on the sliding seat 45. The detection head 47 is installed on the output shaft of the sliding cylinder 44. The lifting cylinder 42 and the sliding cylinder 44 can be standard cylinders or custom cylinders, and their strokes can be adjusted according to actual needs. The detection motor 46 can be a stepper motor or a servo motor. Stepper motors are suitable for low-speed, high-precision detection scenarios, while servo motors are more suitable for high-speed dynamic detection. The detection head 47 can be an optical probe or an ultrasonic probe, used for detecting surface cracks and internal defects, respectively. This modular design allows the detection device 4 to flexibly adapt to various detection needs, improving the comprehensiveness and accuracy of the detection.

[0036] The positioning component 41 includes a positioning seat 47, a rotary motor 412, and positioning rollers 413. The positioning seat 47 is mounted on the workbench 1. Two sets of rotary motors 412 and positioning rollers 413 are provided. The rotary motors 412 are mounted side-by-side on the positioning seat 47, and the two positioning rollers 413 are respectively positioned corresponding to the rotary motors 412 and fixedly connected to the output shaft of the rotary motors 412. The workpiece to be inspected is mounted between the two positioning rollers 413, and can be rotated by the rotation of the positioning rollers 413. The positioning seat 47 can be made of cast iron or welded steel plate, possessing good rigidity and stability. The rotary motor 412 can be a DC motor or an AC motor, and its speed can be adjusted by a frequency converter. Keyways can be formed on the surface of the positioning rollers 413. The keyways can be rectangular or dovetail-shaped to increase the friction between the workpiece to be inspected and the positioning rollers 413, preventing slippage. This design not only achieves stable clamping of the workpiece but also meets the requirements of different inspection speeds.

[0037] like Figure 4As shown in the embodiment of this application, a side positioning component 6 is also included. The side positioning component 6 includes a mounting bracket 61, a limiting cylinder 62, a linkage mechanism 63, and a limiting rod 64. The mounting bracket 61 is mounted on the workbench 1, the limiting cylinder 62 is mounted on the mounting bracket 61, and the limiting rod 64 is mounted on the piston rod of the limiting cylinder 62 through the linkage mechanism 63. A limiting roller is mounted on the limiting rod 64. The mounting bracket 61 can be made of aluminum profile or steel frame, which has good strength and lightweight characteristics. The limiting cylinder 62 can be a compact cylinder, which saves space while ensuring sufficient driving force. The linkage mechanism 63 includes a first connecting rod and a second connecting rod. A support plate is mounted on the limiting cylinder 62, and a support block is mounted on the support plate. One end of the first connecting rod is hinged to the support block, and the other end of the first connecting rod is hinged to the limiting rod 64. One end of the second connecting rod is hinged to the piston rod of the limiting cylinder 62, and the other end of the second connecting rod is hinged to one end of the limiting rod 64. This lever design allows the limit rod 64 to move over a wide range of motion, thus adapting to the lateral positioning requirements of workpieces of different diameters.

[0038] Further design optimization includes a first-axis positioning cylinder, a second-axis positioning cylinder, a first positioning rod, and a second positioning rod. The first and second positioning cylinders are respectively installed on both sides of the axis of the workpiece to be inspected. The first positioning cylinder is mounted on a first lifting assembly, and the second positioning cylinder is mounted on a second lifting assembly. The first lifting assembly drives the first positioning cylinder to rise and fall, and the second lifting assembly drives the second positioning cylinder to rise and fall, thus adapting to workpieces of different sizes. The first positioning rod is mounted on the piston rod of the first-axis positioning cylinder, and the second positioning rod is mounted on the piston rod of the second-axis positioning cylinder. A positioning plate is mounted on the first positioning rod, and a positioning roller is mounted on the second positioning rod. The first and second-axis positioning cylinders can be guide cylinders to ensure the linear motion accuracy of the positioning rods. The positioning plate can be made of rubber or polyurethane material, which has good elasticity and can effectively protect the workpiece surface. The positioning rollers can adopt a bearing structure to reduce frictional resistance and improve positioning stability.

[0039] In this embodiment, a recycling rack 7 is also included. The recycling rack 7 is installed between the feeding device 5 and the detection device 4, and the recycling rack 7 is inclined downwards along the side adjacent to the feeding device 5 to the side away from the feeding device 5, with the inclination angle typically set to 5°~15°. The recycling rack 7 can be formed by bending steel plate, which has good structural strength and stability, and can realize automatic collection of waste materials, avoiding the accumulation of waste materials from affecting the normal detection process.

[0040] The implementation principle of the cylinder liner piston surface crack detection device 4 in this application embodiment is as follows: by integrating the loading device 2, the unloading device 3, the detection device 4, and the feeding device 5 onto the workbench 1, multi-station collaborative operation is realized, significantly improving detection efficiency and positioning accuracy. The loading device 2 achieves precise positioning of the workpiece through the positioning component 41 and the measuring ruler 23, and the sensor 24 monitors the loading process in real time; the unloading device 3 achieves smooth transfer of the workpiece through the horizontal drive component 31 and the unloading cylinder 32; the detection device 4 achieves multi-degree-of-freedom movement through the lifting cylinder 42, the sliding cylinder 44, and the detection motor 46, ensuring that the detection head 47 can fully cover the surface of the workpiece to be detected; the side positioning component 6 and the shaft positioning component work together to achieve all-round clamping of the workpiece, avoiding displacement of the workpiece during the detection process; the recycling rack 7 is responsible for the automatic collection of waste materials, ensuring a clean detection environment. The overall design is scientific and reasonable, fully considering the coordination between the components, significantly improving the practicality and reliability of the crack detection device 4.

[0041] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for detecting surface cracks in cylinder liners and pistons, characterized in that: The device includes a workbench (1), a feeding device (2), a picking device (3), a detection device (4), and a feeding device (5). The feeding device (2), picking device (3), detection device (4), and feeding device (5) are all installed on the workbench (1). The feeding device (2), detection device (4), and feeding device (5) are installed sequentially on the workbench (1) in a horizontal direction. The picking device (3) includes a horizontal drive component (31) and a picking cylinder (32). The material handling platform (33) and the material handling suction cup (34) are provided. The horizontal drive component (31) is installed on the workbench (1), and the material handling cylinder (32) is installed on the horizontal drive component (31). The horizontal drive component (31) drives the material handling cylinder (32) to move in the horizontal direction. The material handling platform (33) is fixedly connected to the piston rod of the material handling cylinder (32). There are two sets of material handling suction cups (34), which are installed on both sides of the material handling platform (33) and are used for unloading and loading respectively. The detection device (4) includes a positioning component (41), a lifting cylinder (42), a lifting seat (43), a sliding cylinder (44), a sliding seat (45), a detection motor (46), and a detection head (47). The positioning component (41) is installed between the loading device (2) and the feeding device (5). The lifting cylinder (42) is installed on the workbench (1). The lifting seat (43) is connected to the piston rod of the lifting cylinder (42). The sliding cylinder (44) is installed on the lifting seat (43). The sliding seat (45) is connected to the piston rod of the sliding cylinder (44). The detection motor (46) is installed on the sliding seat (45). The detection head (47) is installed on the output shaft of the detection motor (46). The positioning component (41) includes a positioning seat (47), a rotary motor (412), and a positioning roller (413). The positioning seat (47) is installed on the workbench (1). The rotary motor (412) and the positioning roller (413) are each provided in two sets. The rotary motor (412) is installed side by side on the positioning seat (47). The two positioning rollers (413) are respectively provided corresponding to the rotary motor (412) and are fixedly connected to the output shaft of the rotary motor (412). The workpiece to be tested is installed between the two positioning rollers (413) and can be driven to rotate by the rotation of the positioning rollers (413). It also includes a side positioning component (6), which includes a mounting bracket (61), a positioning cylinder (62), a linkage mechanism (63), and a limiting rod (64). The mounting bracket (61) is mounted on the workbench (1), the positioning cylinder (62) is mounted on the mounting bracket (61), and the limiting rod (64) is mounted on the piston rod of the positioning cylinder (62) through the linkage mechanism (63). A limiting roller is mounted on the limiting rod (64). The linkage mechanism (63) includes a first link and a second link. A support plate is installed on the positioning cylinder (62), and a support block is installed on the support plate. One end of the first link is hinged to the support block, and the other end of the first link is hinged to the limiting rod (64). One end of the second link is hinged to the piston rod of the positioning cylinder (62), and the other end of the second link is hinged to one end of the limiting rod (64).

2. The cylinder liner piston surface crack detection device according to claim 1, characterized in that: The feeding device (2) includes a feeding conveyor belt (21), a limiting member (22), and a measuring ruler (23). The feeding conveyor belt (21) is installed on the workbench (1). Two sets of limiting members (22) are provided and are respectively installed on both sides of the feeding conveyor belt (21) near the detection device (4). The limiting member (22) includes a limiting cylinder (221) and a limiting plate (222). The positioning cylinder (62) is installed on the feeding conveyor belt (21), and the moving direction of the limiting cylinder (221) is set perpendicular to the feeding direction of the feeding conveyor belt (21). The limiting plate (222) is fixedly connected to the piston rod of the limiting cylinder (221). The measuring ruler (23) is installed on both sides of the feeding conveyor belt (21) at one end of the limiting cylinder (221).

3. The cylinder liner piston surface crack detection device according to claim 2, characterized in that: It also includes sensors (24), which are provided in two sets. The two sets of sensors (24) are respectively installed at one end of the feeding conveyor belt (21) near the detection device (4) and at the middle part of the feeding conveyor belt (21). The number of workpieces to be detected on the feeding conveyor belt (21) is determined by the two sensors (24).

4. The cylinder liner piston surface crack detection device according to claim 1, characterized in that: It also includes a first-axis positioning cylinder, a second-axis positioning cylinder, a first positioning rod, and a second positioning rod. The first and second positioning cylinders are respectively installed on both sides of the axis of the workpiece to be tested. The first positioning rod is installed on the piston rod of the first-axis positioning cylinder, and the second positioning rod is installed on the piston rod of the second-axis positioning cylinder. A positioning plate is installed on the first positioning rod, and a positioning roller is installed on the second positioning rod.

5. The cylinder liner piston surface crack detection device according to claim 1, characterized in that: The positioning roller (413) is provided with a keyway, which is used to increase the friction between the workpiece to be tested and the positioning roller (413).

6. The cylinder liner piston surface crack detection device according to claim 1, characterized in that: It also includes a recycling rack (7), which is installed between the feeding device (5) and the detection device (4), and the recycling rack (7) is inclined downward along the side adjacent to the feeding device (5) to the side away from the feeding device (5).

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