A smart machining device for crane crankshaft journals

Abstract

This invention relates to the field of intelligent manufacturing technology for high-end equipment, and discloses an intelligent machining device for crane crankshaft journals. It includes a CNC machine tool, and a control panel, positioning mechanism, cooling mechanism, power mechanism, machining mechanism, and CNC mechanism disposed on the CNC machine tool. It also includes a machining unit disposed on the CNC machine tool. This invention achieves adaptive precision machining: through a constant force floating head and multi-sensor feedback, the system can automatically compensate for geometric errors and physical interference, maintaining optimal cutting conditions in fluctuating environments, significantly improving the dimensional accuracy, roundness, and surface integrity of the journal; it constructs an active vibration suppression and stabilization system: through a distributed limit mechanism and a closed loop of vibration sensors, it achieves real-time monitoring and active control of the workpiece-tool system vibration, effectively solving the chatter problem in large crankshaft machining, and improving machining quality and tool life.

Description

Technical Field

[0001] This invention relates to the field of intelligent manufacturing technology for high-end equipment, specifically to an intelligent machining device for crane crankshaft journals. Background Technology

[0002] As a core heavy-duty transmission component, the dimensional accuracy, geometric accuracy (roundness, cylindricity), and surface quality of the crankshaft journals of a crane directly affect the load-bearing capacity, service life, and operational reliability of the entire machine. Traditional crankshaft journal machining mainly relies on high-precision CNC grinding machines or lathes, with operators setting process parameters based on experience.

[0003] Currently, the machining process for crane crankshaft journals suffers from the following significant defects: The machining process is uncontrollable, operating in a "black box" state, making it impossible to perceive changes in critical states such as cutting force, vibration, and temperature in real time. This makes it difficult to avoid dimensional deviations or surface damage caused by tool wear, thermal deformation, and uneven workpiece material, relying on post-processing compensation. Machining errors must be detected offline after the process is completed, resulting in high rework or scrap costs and an inability to achieve proactive intervention and closed-loop correction during the machining process. Furthermore, there is a lack of systematic coordination: the machine tool body, auxiliary supports, and cooling systems often operate independently, lacking coordinated linkage based on the machining status, which restricts further improvement in overall machining accuracy and efficiency.

[0004] Therefore, there is an urgent need for an intelligent machining device that can sense the machining status in real time, make autonomous decisions and adjustments, and coordinate multiple mechanisms to achieve stable, reliable and efficient machining quality of crane crankshaft journals. To this end, we propose an intelligent machining device for crane crankshaft journals. Summary of the Invention

[0005] The purpose of this invention is to provide an intelligent machining device for crane crankshaft journals, addressing the significant defects in the current machining process for crane crankshaft journals mentioned in the background: uncontrollable process; machining is in a "black box" state, unable to perceive changes in key states such as cutting force, vibration, and temperature in real time, making it difficult to avoid dimensional deviations or surface damage caused by tool wear, thermal deformation, and uneven workpiece material, relying on post-processing compensation; machining errors need to be detected offline after the process is completed, resulting in high rework or scrap costs and the inability to achieve proactive intervention and closed-loop correction during the machining process; lack of systematic coordination; the machine tool body, auxiliary support, cooling system, etc., often work independently, lacking coordinated linkage based on the machining state, which restricts further improvement in overall machining accuracy and efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an intelligent machining device for crane crankshaft journals, comprising a CNC machine tool, and a control panel, a positioning mechanism, a cooling mechanism, a power mechanism, a machining mechanism, and a CNC mechanism disposed on the CNC machine tool, further comprising:

[0007] A machining unit is disposed on the CNC machine tool, and the machining unit includes:

[0008] A vertical plate is fixedly connected to the CNC machine tool; a machining plate is fixedly connected to the vertical plate; an integrated module is fixedly connected to the far end of the machining plate; a pressure sensor is fixedly connected to the front of the integrated module; a pneumatic rod is fixedly connected to the lower end of the integrated module; a floating rod is movably disposed at the end of the machining plate and corresponds to the lower part of the pneumatic rod; a high-response servo motor is fixedly connected to the lower end of the floating rod; a protective thread rod is connected to the output end of the high-response servo motor; a constant-force floating head is rotatably connected to the lower end of the protective thread rod; and a cutting wheel is connected to the constant-force floating head.

[0009] As a further preferred embodiment of this technical solution, the CNC mechanism includes: a CNC table, fixedly connected to the CNC machine tool; a displacement plate, slidably disposed on the CNC table; a CNC machining chamber, fixedly connected to the distal end of the displacement plate; a displacement rod, connected between the CNC table and the CNC machining chamber; an opposing block, fixedly connected between the displacement rod and the CNC table; a connecting ring, fixedly connected to the front of the CNC table; a CNC platform, fixedly connected to the distal end of the connecting ring; and a position sensor, disposed above the CNC platform.

[0010] As a further preferred embodiment of this technical solution, the positioning mechanism includes: a load-bearing base plate, fixedly connected to the CNC machine tool; a positioning bracket, fixedly connected to the load-bearing base plate; a slider, slidably disposed within the positioning bracket; a threaded rod, rotatably disposed on the front side of the slider; a lifting platform, disposed on the front side of the threaded rod; a rotary valve, rotatably disposed within the lifting platform; a lifting mating plate, fixedly connected to the lower end of the rotary valve; and a processing module, disposed on the front side of the lifting mating plate.

[0011] As a further preferred embodiment of this technical solution, the power mechanism includes: a cylinder, mounted on the processing module; a docking plate, mounted on the upper and lower ends of the cylinder; an accompanying rod and a hydraulic rod, both fixedly connected to the lower end of the docking plate; and a pressure plate, fixedly connected to the distal end of the hydraulic rod.

[0012] As a further preferred embodiment of this technical solution, the floating grinding head is fixedly connected to the processing module; the bearing block is slidably disposed within the processing module; the limiting block is fixedly connected to the bearing block; the sliding plate is disposed on both sides of the limiting block; the vibration accelerometer is fixedly connected to the front of the bearing block; and the positioning column is fixedly connected to the lower end of the bearing block.

[0013] As a further preferred embodiment of this technical solution, the processing mechanism includes: a support plate, fixedly connected to the back of the processing module; a motor, fixedly connected to the front connecting shaft of the support plate, and fixedly connected to the output end of the motor; a connecting bolt, fixedly connected to the distal end of the connecting shaft; a docking shaft, fixedly connected to the front of the connecting bolt; a processing rod, fixedly connected to the distal end of the docking shaft; and a milling block, fixedly connected to the front of the processing rod.

[0014] As a further preferred embodiment of this technical solution, the cooling mechanism includes: a fixed plate, fixedly connected to the surface of the positioning bracket; a cooling box, fixedly connected to the upper end of the fixed plate; a drive motor, disposed inside the cooling box; a conveying pipe, connected to the output end of the drive motor; and a nozzle, rotatably connected to the far end of the conveying pipe and located above the milling block.

[0015] As a further preferred embodiment of this technical solution, the limiting mechanism includes: a movable block slidably disposed within the CNC machining chamber; a movable plate rotatably disposed on both sides of the movable block; a rotating shaft rotatably disposed within the movable block; a limiting arm fixedly connected to the front of the rotating shaft; and a retaining ring fixedly connected to the lower end of the limiting arm and engaging with the surface of the CNC machining chamber.

[0016] As a further preferred embodiment of this technical solution, the limiting platform is fixedly connected to the CNC machining room; the lifting plate is rotatably disposed at both ends of the limiting platform; the electric telescopic rod is fixedly connected to the lower part of the lifting plate; the baffle is fixedly connected to the upper part of the limiting platform; the tilting plate is disposed between the limiting platform and the baffle; the vibration sensor is fixedly connected to the CNC machining room; the adjusting rod is fixedly connected to the side end of the CNC machining room; and the limiting ring is fixedly connected to the lower end of the adjusting rod.

[0017] As a further preferred embodiment of this technical solution, the lower end of the CNC machine tool is fixedly connected to multiple adjustable legs, and the upper end is fixedly connected to a laser sensor.

[0018] This invention provides an intelligent machining device for crane crankshaft journals, which has the following beneficial effects:

[0019] (1) The present invention realizes adaptive precision machining: Through constant force floating head and multi-sensor feedback, the system can automatically compensate for geometric errors and physical interference, maintain the best cutting state in the fluctuating environment, and significantly improve the dimensional accuracy, roundness and surface integrity of the journal; an active vibration suppression and stabilization system is constructed: through the closed loop of distributed limit mechanism and vibration sensor, the real-time monitoring and active control of the vibration of the workpiece-tool system is realized, which effectively solves the chatter problem in the machining of large crankshafts and improves the machining quality and tool life.

[0020] (2) This invention uses a numerical control mechanism as an intelligent hub, so that the subsystems such as positioning, power, processing, limit, and cooling are no longer information islands, but a whole that performs collaborative operations based on unified state perception, thereby improving the certainty and efficiency of the process; enhancing the flexibility and intelligence of the process: the device can adapt to changes in workpieces and processes within a certain range, and continuously improve itself through data accumulation and algorithm optimization, providing key unit technologies for realizing unmanned and intelligent workshops. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the cooling mechanism of the present invention.

[0023] Figure 3 This is a schematic cross-sectional view of the longitudinal structure of the present invention.

[0024] Figure 4 This is a cross-sectional view of the CNC machining room of the present invention.

[0025] Figure 5 This is a schematic diagram of the processing mechanism of the present invention.

[0026] Figure 6 This is a schematic diagram of the processing unit structure of the present invention.

[0027] Figure 7 This is a schematic diagram of the CNC mechanism structure of the present invention.

[0028] Figure 8 This is a schematic diagram of the processing unit structure of the present invention.

[0029] In the diagram: 1. CNC machine tool; 101. Control panel; 102. Adjustable support leg; 103. Laser sensor; 2. Positioning mechanism; 201. Positioning bracket; 202. Slider; 203. Threaded rod; 204. Machining module; 205. Lifting platform; 206. Lifting mating plate; 207. Rotary valve; 208. Load-bearing base plate; 3. Cooling mechanism; 301. Fixing plate; 302. Cooling chamber; 303. Drive motor; 304. Conveying pipe; 305. Nozzle; 4. Power mechanism; 401. Connecting plate; 402. Cylinder; 403. Accompanying rod; 404. Hydraulic rod; 405. Floating grinding head; 406. Pressure plate; 407. Bearing block; 408. Sliding plate; 409. Limiting block; 410. Positioning column; 411. Vibration accelerometer; 5. Limiting mechanism; 501. Moving block; 502. Movable plate; 503. Rotating shaft; 504. Limiting arm; 505. Snap ring; 506. 507. Limiting platform; 508. Baffle; 509. Inclined plate; 510. Electric telescopic rod; 511. Lifting plate; 512. Adjusting rod; 513. Limiting ring; 514. Vibration sensor; 6. Machining mechanism; 601. Support plate; 602. Motor; 603. Connecting shaft; 604. Connecting bolt; 605. Connecting shaft; 606. Machining rod; 607. Milling block; 7. Machining unit; 701. Vertical plate; 702. Machining plate; 703. Collection... Modules; 704, Pressure sensor; 705, Pneumatic rod; 706, Floating rod; 707, High-response servo motor; 708, Protective threaded rod; 709, Constant force floating head; 710, Cutting wheel; 8, CNC mechanism; 801, CNC platform; 802, Connecting ring; 803, Position sensor; 804, Opposing block; 805, CNC table; 806, Displacement plate; 807, Displacement rod; 808, CNC machining room; 809, Connecting block. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] This invention provides a technical solution: such as Figures 1 to 8 As shown in this embodiment, an intelligent machining device for crane crankshaft journals is provided. It includes a CNC machine tool 1, and a control panel 101, a positioning mechanism 2, a cooling mechanism 3, a power mechanism 4, a machining mechanism 6, and a CNC mechanism 8, all mounted on the CNC machine tool 1. It also includes:

[0032] Machining unit 7 is mounted on CNC machine tool 1, and machining unit 7 includes:

[0033] A vertical plate 701 is fixedly connected to the CNC machine tool 1; a machining plate 702 is fixedly connected to the vertical plate 701; an integrated module 703 is fixedly connected to the far end of the machining plate 702; a pressure sensor 704 is fixedly connected to the front of the integrated module 703; a pneumatic rod 705 is fixedly connected to the lower end of the integrated module 703; a floating rod 706 is movably disposed at the end of the machining plate 702 and corresponds to the lower part of the pneumatic rod 705; a high-response servo motor 707 is fixedly connected to the lower end of the floating rod 706; and a thread protection rod 708 is connected to the high-response servo motor. The output end of 707; constant force floating head 709, rotatably connected to the lower end of the protective thread rod 708; and cutting wheel 710, connected to constant force floating head 709; wherein the constant force floating head 709 is linked to the end of the power mechanism 4 through a high-response servo motor 707, and the pressure sensor 704 monitors the radial cutting force in real time during the machining process. The CNC mechanism 8 controls the high-response servo motor 707 to move according to the feedback signal of the pressure sensor 704, driving the constant force floating head 709 to perform radial micro-compensation in order to maintain a constant preset cutting force.

[0034] Positioning mechanism 2 is installed on the main body of CNC machine tool 1 and is used for positioning and clamping workpieces;

[0035] The power mechanism 4 is located on one side of the positioning mechanism 2 and is used to provide processing power and feed motion;

[0036] The machining unit 7, connected to the power mechanism 4, is used to perform cutting and grinding processes. It includes a drive component, a cutting component, and a constant force floating head 709 that integrates a pressure sensor 704 and a high-response servo motor 707.

[0037] The limiting mechanism 5 is located around the processing area and is used to provide dynamic auxiliary support for the workpiece. It includes movable support components and vibration sensor 513.

[0038] The CNC mechanism 8 is integrated into the main body of the CNC machine tool 1 and is electrically connected to the positioning mechanism 2, the power mechanism 4, the machining unit 7 and the limit mechanism 5. It is used to receive sensor signals and coordinate the actions of each mechanism.

[0039] The CNC mechanism 8 includes: a CNC table 805, fixedly connected to the CNC machine tool 1; a displacement plate 806, slidably disposed on the CNC table 805; a CNC machining chamber 808, fixedly connected to the far end of the displacement plate 806; a displacement rod 807, connected between the CNC table 805 and the CNC machining chamber 808; an opposing block 804, fixedly connected between the displacement rod 807 and the CNC table 805; a connecting ring 802, fixedly connected to the front of the CNC table 805; a CNC platform 801, fixedly connected to the far end of the connecting ring 802; and a position sensor 803, disposed above the CNC platform 801. The CNC mechanism 8, comprising a CNC platform, a multi-axis motion controller, a data acquisition card, and an industrial computing unit, constitutes an edge intelligent node capable of performing multi-sensor information fusion, real-time optimization of process parameters, and equipment status monitoring and analysis.

[0040] The positioning mechanism 2 includes: a load-bearing base plate 208, fixedly connected to the CNC machine tool 1; a positioning bracket 201, fixedly connected to the load-bearing base plate 208; a slider 202, slidably disposed within the positioning bracket 201; a threaded rod 203, rotatably disposed on the front side of the slider 202; a lifting platform 205, disposed on the front side of the threaded rod 203; a rotary valve 207, rotatably disposed within the lifting platform 205; a lifting mating plate 206, fixedly connected to the lower end of the rotary valve 207; and a processing module 204, disposed on the front side of the lifting mating plate 206. The positioning mechanism 2, including the lifting platform 205, the positioning bracket 201, and the load-bearing base plate 208, is used to accommodate the clamping and positioning of crankshafts of different sizes.

[0041] The power mechanism 4 includes: a cylinder 402, which is mounted on the processing module 204; a docking plate 401, which is mounted on the upper and lower ends of the cylinder 402; an accompanying rod 403 and a hydraulic rod 404, both of which are fixedly connected to the lower end of the docking plate 401; and a pressure plate 406, which is fixedly connected to the far end of the hydraulic rod 404.

[0042] The floating grinding head 405 is fixedly connected to the processing module 204; the bearing block 407 is slidably disposed within the processing module 204; the limiting block 409 is fixedly connected to the bearing block 407; the sliding plate 408 is disposed on both sides of the limiting block 409; the vibration accelerometer 411 is fixedly connected to the front of the bearing block 407; and the positioning column 410 is fixedly connected to the lower end of the bearing block 407.

[0043] The processing mechanism 6 includes: a support plate 601, fixedly connected to the back of the processing module 204; a motor 602, fixedly connected to the front of the support plate 601; a connecting shaft 603, fixedly connected to the output end of the motor 602; a connecting bolt 604, fixedly connected to the far end of the connecting shaft 603; a docking shaft 605, fixedly connected to the front of the connecting bolt 604; a processing rod 606, fixedly connected to the far end of the docking shaft 605; and a milling block 607, fixedly connected to the front of the processing rod 606.

[0044] The cooling mechanism 3 includes: a fixed plate 301, fixedly connected to the surface of the positioning bracket 201; a cooling box 302, fixedly connected to the upper end of the fixed plate 301; a drive motor 303, disposed inside the cooling box 302; a delivery pipe 304, connected to the output end of the drive motor 303; and a nozzle 305, rotatably connected to the far end of the delivery pipe 304 and located above the milling block 607. The cooling mechanism 3 includes a coolant source, a delivery pipe 304, and a nozzle 305 pointing towards the machining area; the CNC mechanism 8 controls the start and stop of the cooling mechanism 3 and the coolant flow rate according to the machining status information.

[0045] This includes a limiting mechanism 5, which comprises: a moving block 501, slidably disposed within the CNC machining chamber 808; a movable plate 502, rotatably disposed on both sides of the moving block 501; a rotating shaft 503, rotatably disposed within the moving block 501; a limiting arm 504, fixedly connected to the front of the rotating shaft 503; and a retaining ring 505, fixedly connected to the lower end of the limiting arm 504 and engaging with the surface of the CNC machining chamber 808.

[0046] The limiting platform 506 is fixedly connected to the CNC machining room 808; the lifting plate 510 is rotatably mounted at both ends of the limiting platform 506; the electric telescopic rod 509 is fixedly connected to the lower part of the lifting plate 510; the baffle 507 is fixedly connected to the upper part of the limiting platform 506; the tilting plate 508 is located between the limiting platform 506 and the baffle 507; the vibration sensor 513 is fixedly connected to the CNC machining room 808; the adjusting rod 511 is fixedly connected to the side end of the CNC machining room 808; and the limiting ring 512 is fixedly connected to the lower end of the adjusting rod 511. The limiting platform 506 is provided at the end of the support component of the limiting mechanism 5, and the vibration sensor 513 is integrated on the limiting platform 506; the limiting platform 506 receives the signal from the vibration sensor 513, and when the vibration amplitude exceeds the preset threshold, it controls the limiting mechanism 5 to adjust the support state, and controls the power mechanism 4 to adjust the feed parameters. The limiting ring 512 can complete the first step of limiting and fixing the crankshaft journal. At the same time, when the crankshaft journal needs to be processed on multiple sides, the electric telescopic rod 509 can be activated. The electric telescopic rod 509 will drive the lifting plate 510 above it to lift the crankshaft journal that needs to be processed. Since the baffle 507 and the tilting plate 508 are provided, the crankshaft journal can only move up to the position of the baffle 507 to complete the flipping, thus making it suitable for more processing scenarios.

[0047] The lower end of the CNC machine tool 1 is fixedly connected with multiple adjustable legs 102, and the upper end is fixedly connected with a laser sensor 103.

[0048] This invention provides an intelligent machining device for crane crankshaft journals, the specific working principle of which is as follows:

[0049] The device uses a high-rigidity CNC machine tool 1 as its base. The positioning mechanism 2 is fixed to the machine tool's worktable via its load-bearing base plate 208. The crankshaft blank is aligned and initially clamped via the positioning bracket 201 and lifting platform 205 on it. The power mechanism 4 is connected to the machine tool's guide rail via its sliding plate 408, and can move precisely in the X, Y, and Z directions under CNC commands; its front-end floating grinding head 405 outputs the main rotary motion. The machining unit 7 is rigidly connected to the end of the power mechanism 4 via a vertical plate 701. Its internal motor 602 drives the cutting wheel 710 to rotate via a connecting shaft 603, etc. The key constant force floating head 709 is connected to the floating rod 706 via a protective threaded rod 708. The internally integrated pressure sensor 704 detects the cutting force in real time, and the high-response servo motor 707 can drive it to perform radial micro-motion compensation. Multiple moving blocks 501 of the limiting mechanism 5 can be arranged along the machining area. The limiting platform 506 at the top of its limiting arm 504 can be raised and lowered by an electric telescopic rod 509 to provide nearby support when machining different journals. A vibration sensor 513 on it is used to monitor workpiece vibration. The nozzle 305 of the cooling mechanism 3 is aligned with the grinding arc area. The CNC mechanism 8 is integrated into the machine tool body and connected to all motors, sensors, and actuators via cables.

[0050] The operator calls the machining program through the control panel 101. The positioning mechanism 2, in conjunction with the CNC mechanism 8, adjusts the crankshaft blank to the machining position. The device first performs tool setting, and auxiliary measurement systems such as the laser sensor 103 help establish the workpiece coordinate system. Machining begins, and the power mechanism 4 drives the machining unit 7 to move to the target journal. The cutting wheel 710 contacts the workpiece, and the pressure sensor 704 reads the radial force signal in real time and transmits it to the CNC mechanism 8.

[0051] If the measured force deviates from the preset optimal value, the CNC mechanism 8 immediately calculates the compensation amount and instructs the high-response servo motor 707 to drive the constant force floating head 709 to perform micro-advance or micro-retraction, so that the cutting force remains constant, effectively dealing with workpiece roundness errors or minor machine tool crawling. During processing, the vibration sensor 513 on the limit stage 506 continuously monitors. If the vibration amplitude at a certain measuring point exceeds the safety threshold, the CNC mechanism 8 judges that chatter may occur. On the one hand, it can finely adjust the height of the lifting plate 510 of the limit mechanism at that point to change the system stiffness; on the other hand, it can adjust the feed speed or spindle speed of the power mechanism 4 in conjunction with the system to suppress vibration through multiple measures. The CNC mechanism 8 estimates the temperature rise in the grinding zone based on parameter models such as spindle load current and feed rate, or it may directly integrate infrared temperature measurement in the future. When it is judged that there is a risk of the temperature exceeding the standard, the drive motor 303 of the cooling mechanism 3 is automatically started, and the coolant is precisely sprayed into the grinding arc zone through the nozzle 305 to achieve on-demand cooling. Throughout the entire machining process, data such as position, pressure, vibration, and system status are recorded by the CNC mechanism 8 and stored in the storage unit of the CNC machining room 808. This data can be used for quality traceability of the current machining operation, and can also be analyzed through background algorithms to optimize the machining parameters of the next crankshaft, or generate equipment health status reports to achieve predictive maintenance.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An intelligent machining device for crane crankshaft journals, characterized in that, The system includes a CNC machine tool (1), and a control panel (101), a positioning mechanism (2), a cooling mechanism (3), a power mechanism (4), a machining mechanism (6), and a CNC mechanism (8) disposed on the CNC machine tool (1), characterized in that it further includes: A machining unit (7) is disposed on the CNC machine tool (1), and the machining unit (7) includes: A vertical plate (701) is fixedly connected to the CNC machine tool (1); a machining plate (702) is fixedly connected to the vertical plate (701); an integrated module (703) is fixedly connected to the far end of the machining plate (702); a pressure sensor (704) is fixedly connected to the front of the integrated module (703); a pneumatic rod (705) is fixedly connected to the lower end of the integrated module (703); a floating rod (706) is movably disposed at the end of the machining plate (702) and corresponds to the lower part of the pneumatic rod (705); a high-response servo motor (707) is fixedly connected to the lower end of the floating rod (706); a protective thread rod (708) is connected to the output end of the high-response servo motor (707); a constant force floating head (709) is rotatably connected to the lower end of the protective thread rod (708); and a cutting wheel (710) is connected to the constant force floating head (709). The CNC mechanism (8) includes: a CNC table (805), fixedly connected to the CNC machine tool (1); a displacement plate (806), slidably disposed on the CNC table (805); a CNC machining chamber (808), fixedly connected to the far end of the displacement plate (806); a displacement rod (807), connected between the CNC table (805) and the CNC machining chamber (808); an opposing block (804), fixedly connected between the displacement rod (807) and the CNC table (805); a connecting ring (802), fixedly connected to the front of the CNC table (805); a CNC platform (801), fixedly connected to the far end of the connecting ring (802); and a position sensor (803), disposed above the CNC platform (801). It also includes a limiting mechanism (5), which includes: a moving block (501) slidably disposed in the CNC machining room (808); a movable plate (502) rotatably disposed on both sides of the moving block (501); a rotating shaft (503) rotatably disposed in the moving block (501); a limiting arm (504) fixedly connected to the front of the rotating shaft (503); a retaining ring (505) fixedly connected to the lower end of the limiting arm (504) and engaging with the surface of the CNC machining room (808); and a limiting platform (506) fixedly connected in the CNC machining room (808). A lifting plate (510) is rotatably mounted at both ends of the limiting platform (506); an electric telescopic rod (509) is fixedly connected to the lower part of the lifting plate (510); a baffle (507) is fixedly connected to the upper part of the limiting platform (506); an inclined plate (508) is disposed between the limiting platform (506) and the baffle (507); a vibration sensor (513) is fixedly connected to the CNC machining room (808); an adjusting rod (511) is fixedly connected to the side end of the CNC machining room (808); and a limiting ring (512) is fixedly connected to the lower end of the adjusting rod (511).

2. The intelligent machining device for crane crankshaft journals according to claim 1, characterized in that: The positioning mechanism (2) includes: a load-bearing base plate (208) fixedly connected to the CNC machine tool (1); a positioning bracket (201) fixedly connected to the load-bearing base plate (208); a slider (202) slidably disposed within the positioning bracket (201); a threaded rod (203) rotatably disposed on the front side of the slider (202); a lifting platform (205) disposed on the front side of the threaded rod (203); a rotary valve (207) rotatably disposed within the lifting platform (205); a lifting mating plate (206) fixedly connected to the lower end of the rotary valve (207); and a processing module (204) disposed on the front side of the lifting mating plate (206).

3. The intelligent machining device for crane crankshaft journals according to claim 2, characterized in that: The power mechanism (4) includes: a cylinder (402) disposed on the processing module (204); a docking plate (401) disposed at the upper and lower ends of the cylinder (402); an accompanying rod (403) and a hydraulic rod (404) both fixedly connected to the lower end of the docking plate (401); and a pressure plate (406) fixedly connected to the far end of the hydraulic rod (404).

4. The intelligent machining device for crane crankshaft journals according to claim 3, characterized in that: The assembly includes a floating grinding head (405) fixedly connected to the processing module (204); a bearing block (407) slidably disposed within the processing module (204); a limiting block (409) fixedly connected to the bearing block (407); a sliding plate (408) disposed on both sides of the limiting block (409); a vibration accelerometer (411) fixedly connected to the front of the bearing block (407); and a positioning column (410) fixedly connected to the lower end of the bearing block (407).

5. The intelligent machining device for crane crankshaft journals according to claim 4, characterized in that: The processing mechanism (6) includes: a support plate (601) fixedly connected to the back of the processing module (204); a motor (602) fixedly connected to the front connecting shaft (603) of the support plate (601) and fixedly connected to the output end of the motor (602); a connecting bolt (604) fixedly connected to the far end of the connecting shaft (603); a docking shaft (605) fixedly connected to the front of the connecting bolt (604); a processing rod (606) fixedly connected to the far end of the docking shaft (605); and a milling block (607) fixedly connected to the front of the processing rod (606).

6. The intelligent machining device for crane crankshaft journals according to claim 5, characterized in that: The cooling mechanism (3) includes: a fixed plate (301) fixedly connected to the surface of the positioning bracket (201); a cooling box (302) fixedly connected to the upper end of the fixed plate (301); a drive motor (303) disposed inside the cooling box (302); a conveying pipe (304) connected to the output end of the drive motor (303); and a nozzle (305) rotatably connected to the far end of the conveying pipe (304) and located above the milling block (607).

7. The intelligent machining device for crane crankshaft journals according to claim 1, characterized in that: The lower end of the CNC machine tool (1) is fixedly connected with multiple adjustable legs (102), and the upper end is fixedly connected with a laser sensor (103).

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