Special adjustable center frame for large crankshaft
By designing a dedicated adjustable center rest for large crankshafts and employing a hydraulic center rest and a servo motor-driven eccentric shaft, the problem of the inability to adjust the center position of large crankshafts was solved, thereby improving machining accuracy and machine tool stability.
Patent Information
- Application Number
- CN202520040333.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-08
AI Technical Summary
Large crankshafts cannot be freely adjusted in center position before machining, resulting in insufficient final machining accuracy and stability, which affects the working accuracy, stability and reliability of the machine tool.
A large crankshaft-specific adjustable center support was designed, which consists of a hydraulic center support body, base, support frame, cam adjustment mechanism, servo motor, reducer and locking cylinder, etc. The center support is finely adjusted by driving the eccentric shaft through the servo motor, and precision feed is achieved by combining CNC control.
It enables precise micro-adjustment of the center position of large crankshafts, improving machining accuracy and stability, and ensuring the working accuracy and reliability of machine tools.
Smart Images
Figure CN223749033U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to mechanical manufacturing field, concretely relates to a large -scale crankshaft special adjustable center stand. BACKGROUND
[0002] The crankshaft is the most important component in the engine, it bears the force from the connecting rod, and changes it into the torque through the crankshaft output and drives other accessories on the engine to work, the crankshaft is acted on by the centrifugal force of rotating mass, the periodic change gas inertial force and the reciprocating inertia force, makes the crankshaft bear the bending torsional load, therefore requires that the crankshaft has enough strength and rigidity, the journal surface needs wear resistance, uniform work, good balance.
[0003] In the prior art, when the crankshaft is processed, in order to facilitate the processing and fixing of the crankshaft, the crankshaft is fixed by using the machine tool center stand, and then the processing of the crankshaft can be facilitated through the fixing of the machine tool center stand.
[0004] However, due to the machining size of the large crankshaft, the weight of the crankshaft, deformation and other problems, the center of the multiple self-centering hydraulic center stands is difficult to position, and the free expansion required before the machining of the large crankshaft cannot be realized, thereby affecting the final machining precision and stability of the large crankshaft, greatly damaging the geometric precision of high-end crankshaft turning and milling combination, and affecting the working precision, stability, reliability and precision retention of the machine tool. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a large -scale crankshaft special adjustable center stand, which aims at solving the problem of insufficient final machining precision and stability caused by the inability to freely adjust before the machining of the large crankshaft in the above background technology.
[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a large -scale crankshaft special adjustable center stand, including hydraulic center stand body, still including base, the support frame is fixedly installed on the base through the position locking mechanism, the top of support frame is equipped with cam adjusting mechanism, the cam adjusting mechanism includes eccentric shaft, servo motor, speed reducer and first locking oil cylinder, the eccentric shaft is horizontally arranged and is rotatably connected on the support frame through the bearing, the servo motor and the speed reducer are all fixedly installed on the support frame through the mounting seat, the output shaft of servo motor connects the speed reducer, the power output shaft of speed reducer is fixedly connected with one end of eccentric shaft, the hydraulic center stand body is fixedly connected with the other end of eccentric shaft, the first locking oil cylinder that locks the hydraulic center stand body is equipped on the support frame.
[0007] Further, the position adjusting and locking mechanism comprises a moving plate, a moving oil cylinder for driving the moving plate to move and a locking mechanism, the moving plate is slidably arranged on the base, the locking mechanism comprises a T-shaped nut and a second locking oil cylinder, a T-shaped sliding groove is formed in the base, the T-shaped nut is slidably arranged in the T-shaped sliding groove, the second locking oil cylinder is fixedly arranged on the moving plate, a through hole is formed in the moving plate, and the output end of the second locking oil cylinder passes through the through hole and is fixedly connected with the T-shaped nut.
[0008] Further, the hydraulic center frame body is provided with a T-shaped groove, the piston rod end of the first locking oil cylinder is fixedly connected with a T-shaped nut, and the T-shaped groove of the hydraulic center frame body is locked by driving the piston rod to lock the T-shaped groove of the hydraulic center frame body by the first locking oil cylinder, so that the hydraulic center frame body can be fixedly locked.
[0009] The utility model has the advantages that the utility model provides a special adjustable center frame for large -scale crank shaft, according to the center position of each supporting axle diameter of typical parts such as crank shaft and the processing technology requirement of large -scale crank shaft parts, calculates each center frame theoretical center position, adopts trace precision feed structure, through numerical control control each center frame adjustment servo motor drives eccentric shaft through big reduction gear and realizes each center frame supporting center position accurate trace adjustment, has the characteristics such as big reduction range, trace feed precision is high, power torque characteristic is excellent, transmission is stable, compact structure, realizes each center frame trace adjustable function when crank shaft processes. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1 It is whole structural schematic diagram of the utility model;
[0011] Figure 2 It is front view structural schematic diagram in the utility model;
[0012] Figure 3 It is Figure 1 Enlarged structural schematic diagram of A place in;
[0013] In the drawing: 1, hydraulic center frame body;2, base 2;3, support frame;4, eccentric shaft;5, servo motor;6, speed reducer;7, first locking oil cylinder;8, moving plate;9, moving oil cylinder;10, T-shaped nut;11, second locking oil cylinder;12, T-shaped sliding groove. DETAILED DESCRIPTION
[0014] As Figures 1 to 3As shown, a large special adjustable center frame of crankshaft, including hydraulic center frame body 1, still including base 2, support frame 3 is fixedly installed on base 2 through position locking mechanism, cam adjusting mechanism is arranged on the top of support frame 3, and the cam adjusting mechanism includes eccentric shaft 4, servo motor 5, speed reducer 6 and first locking cylinder 7, the eccentric shaft 4 is horizontally arranged and is rotatably connected on the support frame 3 by bearing, the servo motor 5 and the speed reducer 6 are fixedly installed on the support frame 3 by mounting seat, the output shaft of servo motor 5 is connected with speed reducer 6, the power output shaft of speed reducer 6 is fixedly connected with one end of eccentric shaft 4, two high-density copper alloy material oil-free bearings are arranged on eccentric shaft 4, hydraulic center frame body 1 is fixedly connected with the other end of eccentric shaft 4, and the first locking cylinder 7 for locking hydraulic center frame body 1 is arranged on support frame 3;The eccentricity of eccentric shaft 4 is determined according to the size of crankshaft and processing technology requirements;Speed reducer 6 is high-rigidity helical tooth right-angle type speed reducer with brake, the low-speed rotation of eccentric shaft 4 and the slight feeding of hydraulic center frame body 1 are realized.
[0015] The position locking mechanism includes moving plate 8, moving cylinder 9 for driving moving plate 8 to move and locking mechanism, the moving plate 8 is slidably installed on the base 2, the locking mechanism includes T-shaped nut 10 and second locking cylinder 11, the T-shaped sliding slot 12 is formed in the base 2, the T-shaped nut 10 is slidably arranged in the T-shaped sliding slot 12, the second locking cylinder 11 is fixedly installed on the moving plate 8, and the through hole is formed in the moving plate 8, and the output end of the second locking cylinder 11 passes through the through hole and is fixedly connected with the T-shaped nut 10.
[0016] The T-shaped groove is arranged on the hydraulic center frame body 1, the piston rod end of the first locking cylinder 7 is fixedly connected with the T-shaped nut, and the T-shaped groove of the hydraulic center frame body 1 is locked by driving the piston rod of the first locking cylinder 7, so that the hydraulic center frame body 1 can be fixedly locked.
[0017] The specific operation process of the utility model is as follows:
[0018] The mobile plate 8 drives the hydraulic center frame body 1 on the support frame 3 to move horizontally on the base 2, and after moving to a proper position, the second locking oil cylinder 11 is opened, so that the mobile plate 8 is locked on the base 2. The eccentric shaft 4 is driven by the servo motor 5 through the speed reducer 6 for adjustment. The servo motor 5 is set as a servo shaft and an absolute value shaft in the control system of the machine tool, adopts a rotation mode control, the rotation degree is 0° to 359.999°, and the control step distance is 0.001° at least. The eccentric shaft 4 can adjust the clamping center of the hydraulic center frame body 1 in four directions of up, down, left and right. The definitions of the four directions in the adjustment value are that the up is a positive value, the down is a negative value, the left is a positive value, and the right is a negative value. For example, the adjustment value in the up direction of the clamping is 0.06mm on the basis of the original zero position, and the adjustment value in the left direction of the clamping is-0.05mm on the basis of the original zero position. According to the eccentric amount 0.1mm, the rotation angle of the eccentric shaft 4 is calculated as 307.34°, and the output shaft of the servo motor 5 is rotated to the position of 307.34°, so as to achieve the adjustment value;
[0019] When the hydraulic center frame body 1 is adjusted, the first locking oil cylinder 7 is opened first, the hydraulic center frame body 1 is moved to the position needed to be clamped, and then the first locking oil cylinder 7 is started to be locked. According to the calculation of the form and position error of the rough machining of each main journal of the large crankshaft, the adjustment value of the adjustable center frame corresponding to each main journal clamping is determined. The first locking oil cylinder 7 is opened, the first adjustment is performed and then locked, the large crankshaft is clamped, and then the precise measuring head of the five-axis turning and milling combined machine tool is used for measurement. According to the installation error value calculated according to the process requirement value of the machining of the large crankshaft, the adjustment value of the hydraulic center frame body 1 corresponding to each main journal clamping is determined. The first locking oil cylinder 7 is opened, the second adjustment is performed and then locked, and the whole adjustment link is completed. The machining of the large crankshaft can be performed.
Claims
1. A large crankshaft special adjustable center stand, comprising a hydraulic center stand body (1), characterized in that, Also include the base (2), the base (2) is fixedly installed with support frame (3) through the position locking mechanism, the top of support frame (3) is equipped with cam adjusting mechanism, the cam adjusting mechanism includes eccentric shaft (4), servo motor (5), speed reducer (6) and first locking cylinder (7), the eccentric shaft (4) is horizontally arranged and is rotatably connected on support frame (3) through bearing, the servo motor (5) and speed reducer (6) are both fixedly installed on support frame (3) through mounting seat, the output shaft of servo motor (5) is connected with speed reducer (6), the power output shaft of speed reducer (6) is fixedly connected with one end of eccentric shaft (4), the hydraulic center frame body (1) is fixedly connected with the other end of eccentric shaft (4), the support frame (3) is equipped with the first locking cylinder (7) for locking hydraulic center frame body (1).
2. A centering device according to claim 1, characterized in that The position locking mechanism includes moving plate (8), moving cylinder (9) for driving moving plate (8) to move and locking mechanism, the moving plate (8) is slidably installed on base (2), the locking mechanism includes T-shaped nut (10) and second locking cylinder (11), the T-shaped slide groove (12) is formed in base (2), the T-shaped nut (10) is slidably arranged in T-shaped slide groove (12), the second locking cylinder (11) is fixedly installed on moving plate (8), the through hole is formed in moving plate (8), the output end of second locking cylinder (11) passes through the through hole and is fixedly connected with T-shaped nut (10).
3. The adjustable centering support for large crankshafts according to claim 1, characterized in that, The hydraulic center frame body (1) is equipped with T-shaped groove, the piston rod end of first locking cylinder (7) is fixedly connected with T-shaped nut, the T-shaped groove of hydraulic center frame body (1) is locked by driving piston rod of first locking cylinder (7), so that the hydraulic center frame body (1) can be fixedly locked.