A marine crankshaft polishing machine

Abstract

The present invention discloses a marine crankshaft polishing machine, comprising a bed, a first guide rail and a second guide rail are arranged on the bed, the first guide rail and the second guide rail are parallel; a tailstock moving plate is arranged at one end of the first guide rail, a tailstock is fixedly arranged on the tailstock moving plate, and a fixed tailstock is arranged at the other end of the first guide rail; a driving device is fixedly arranged above the fixed tailstock; a moving platform is arranged on the second guide rail, and a polishing arm is arranged on the moving platform; the advantages of the present invention are: 1. By adjusting the tailstock, crankshafts of different lengths can be applied, and the radial adjustment structure of the moving platform also adapts to the adjustment of crankshafts of different diameters; 2. The tailstock and the driving device are integrated, and the crankshaft is driven to rotate by a lever, instead of arranging a large-volume driving device at the end of the crankshaft, so the structure is simple and the centering effect is better. 3. The stroke adjustment device is used to ensure the up and down movement of the bearing below the tailstock moving plate, and then the crankshaft can be transported through the tailstock moving plate.

Description

Technical Field

[0001] The invention relates to the field of machinery, in particular to a polishing machine, and more particularly to a crankshaft polishing machine. Background Art

[0002] The marine crankshaft is the main rotating part in the marine engine. After the connecting rod is installed, it can transform the up and down (reciprocating) motion of the connecting rod into a circular (rotating) motion. There is a high-load relative rotation between the connecting rod bearing and the crankshaft journal. In addition to the high surface roughness requirements, the crankshaft journal surface also has high geometric tolerance requirements. After grinding, the crankshaft journal surface has vibration marks, which cannot meet the required geometric tolerance requirements. Polishing must be used to remove the vibration marks to meet the geometric tolerance requirements of the crankshaft.

[0003] The crankshaft polishing machine is an important mechanical equipment in crankshaft processing. The crankshaft outer surface is polished by the crankshaft polishing machine to improve the surface roughness of the crankshaft while meeting the shape and position tolerance requirements of the crankshaft. Most of the existing polishing machines are developed for automotive engine crankshafts. However, there is no special polishing machine for marine crankshafts with axial dimensions greater than 2m. The existing processing method is to directly use sandpaper to manually polish the journal. The polishing quality during the polishing process depends entirely on the operator's experience. This polishing method is laborious and laborious, with low polishing efficiency and no quality assurance. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a polishing machine that can be adjusted according to the size of the crankshaft, and use a counterweight to set the pressure of the polishing belt on the crankshaft to ensure the polishing accuracy. The specific technical solution is as follows:

[0005] A marine crankshaft polishing machine comprises a bed, characterized in that: a first guide rail and a second guide rail are arranged on the bed, the first guide rail and the second guide rail are parallel; a tailstock moving plate is arranged at one end of the first guide rail, a tailstock is fixedly arranged on the tailstock moving plate, and a fixed tailstock is arranged at the other end of the first guide rail; a driving device is fixedly arranged above the fixed tailstock; a moving platform is arranged on the second guide rail, and a polishing arm is arranged on the moving platform;

[0006] The tailstock moving plate is provided with a stroke adjustment device, the stroke adjustment device comprises a bearing, the bearing is fixed on a bearing support plate, one end of the bearing support plate is axially connected to the bottom plate, the other end of the bearing support plate is abutted against an adjustment bolt, and the adjustment bolt is screwed into a screw hole on the bottom plate; the tailstock is fixed to the bottom plate by bolts;

[0007] A positioning hole is provided at the lower side of the tailstock moving plate facing away from the fixed tailstock, a positioning block is inserted into the positioning hole, a screw hole is provided on the positioning block, a positioning bolt is tightened in the screw hole and abuts against the tailstock moving plate;

[0008] The driving device includes a rotating motor and a reducer, the rotating motor is connected to the reducer, the output shaft of the reducer is connected to the dial through a gear, a lever is installed on the surface of the dial, and the lever is embedded in the end of the crankshaft to drive the crankshaft to rotate;

[0009] A roller is arranged on the support plate below the movable platform, and the roller rolls on the second guide rail; the cross section of the second guide rail is a U-shape with the opening facing outward, the inner side of the second guide rail abuts against the eccentric wheel, and the eccentric wheel is fixed on the support plate; the upper side of the movable platform is connected to the polishing arm by bolts;

[0010] The polishing arm includes a frame, and the frame includes a rotating arm. The rotating arm is axially connected to a bracket fixed on a mobile platform. An L-shaped support arm is fixed above the rotating arm. A tensioning wheel is arranged in the middle position of the support arm, a driven wheel is arranged at the lower end of the support arm, and a counterweight block is arranged at the upper end of the support arm. The polishing motor is fixed on the rotating arm, and the output shaft of the polishing motor is connected to the driving wheel. The polishing belt passes around the tensioning wheel, the driven wheel and the driving wheel. Part of the outer side surface of the polishing belt abuts against the outer side surface of the crankshaft.

[0011] A deep groove ball bearing is arranged on the outer side of the eccentric wheel, and the deep groove ball bearing abuts against the inner side of the second guide rail.

[0012] The rotating shaft of the tension wheel is arranged on a slide block, a vertical T-slot is arranged on the slide block, the upper ends of the upper and lower adjusting bolts are screwed to the hand wheel, and the lower ends of the upper and lower adjusting bolts are screwed to the T-slot.

[0013] The counterweight blocks are multiple pieces, which are fixed into one piece by bolts.

[0014] The reducer is a cycloidal reducer, and a pinion is installed at the output end of the cycloidal reducer, and the pinion is meshed with the outer gear of the dial.

[0015] The mobile platform also includes a brake device, which includes a clamping block. A bolt hole is arranged on one side of the clamping block. The brake bolt is rotated through the bolt hole and abuts against the second track.

[0016] The advantages of the present invention are:

[0017] 1. The tailstock can be adjusted to accommodate crankshafts of different lengths, while the radial adjustment structure of the mobile platform can also accommodate crankshafts of different diameters;

[0018] 2. The tailstock and the driving device are integrated, and the crankshaft is driven to rotate by a lever, instead of setting a large driving device at the end of the crankshaft. Therefore, the structure is simple and the centering effect is better.

[0019] 3. A stroke adjustment device is provided by using the tailstock moving plate to ensure the up and down movement of the bearing under the tailstock moving plate, so that the crankshaft can be transported by the tailstock moving plate; in addition, the processing height of the crankshaft can also be adjusted by the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 for Figure 1 Left view of;

[0022] Figure 3-1 It is a schematic diagram of the height adjustment device of the tailstock moving plate;

[0023] Figure 3-2 It is a structural schematic diagram of the stroke adjustment device;

[0024] Figure 4 is a schematic diagram of the structure of the driving device;

[0025] Figure 5 for Figure 4 Left view of;

[0026] Figure 6-1 It is a structural diagram of the mobile platform;

[0027] Figure 6-2 is a schematic diagram of the structure of the brake device;

[0028] Figure 7 is a schematic diagram of the structure of the polishing arm;

[0029] Figure 8-1 It is a structural schematic diagram of the tensioner adjustment device;

[0030] Figure 8-2 for Figure 8-1 Cross-sectional view along the axis of the adjusting bolt. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the accompanying drawings. As shown in the figure, the present invention includes a bed 1, on which a first guide rail 101 and a second guide rail 102 are arranged, and the first guide rail and the second guide rail are parallel; a tailstock moving plate 31 is arranged at one end of the first guide rail, a tailstock 3 is fixedly arranged on the tailstock moving plate, and a driving device 6 is fixedly arranged above the fixed tailstock at the other end; a moving platform 4 is arranged on the second guide rail, and a polishing arm 5 is arranged on the moving platform; and a stabilizing device is arranged on both the tailstock moving plate 31 and the moving platform 4;

[0032] The tailstock movable plate 34 is provided with a stroke adjustment device, and the stroke adjustment device includes a plurality of groups of bearings 32 rolling on the first track, and the bearings are fixed on the bearing support plate 33, one end of the bearing support plate 33 is axially connected to the bottom plate 34, and the other end of the bearing support plate is abutted against the adjustment bolt 35, and the adjustment bolt 35 is screwed into the screw hole on the bottom plate 34; the tailstock 3 is fixed to the bottom plate by bolts; when the adjustment bolt is rotated, the end of the adjustment bolt abuts against the bearing support plate, so that the bearing support plate rotates around the axis connected to the bottom plate, thereby adjusting the height of the tailstock movable plate 34 in the up and down directions, thereby ensuring that the bearing is exposed below the tailstock movable plate, so that it can be adjusted in the first guide The tailstock moving plate 34 is provided with a screw hole, and the positioning block 36 is provided with a screw hole, and the positioning bolt 37 is tightened in the screw hole and abuts against the bottom plate 34 of the tailstock moving plate; in this way, an axial force can be applied to the crankshaft through the tailstock moving plate to ensure that both ends of the crankshaft are clamped; when the processing is completed, the adjusting bolt is rotated again to expose the bearing from the tailstock moving plate so that the bearing can be moved out using the tailstock moving plate.

[0033] The driving device includes a rotary motor 65 and a reducer 61, the rotary motor is connected to the reducer, the output shaft of the reducer is connected to a dial 63 through a gear, a lever 64 is installed on the surface of the dial, and the lever is embedded in the end of the crankshaft to drive the crankshaft to rotate;

[0034] A roller 43 is provided on the support plate 41 below the mobile platform 4, and the roller rolls on the second guide rail 102; the cross section of the second guide rail is a U-shaped opening facing outward, and the inner side of the second guide rail abuts against the eccentric wheel, and the eccentric wheel 45 is fixed on the support plate 41; the upper bracket 42 of the mobile platform is connected to the polishing arm 5 by bolts;

[0035] The polishing arm includes a frame, and the frame includes a rotating arm 51. The rotating arm is axially connected to the bracket 46 fixed on the mobile platform 4 through an axis 54. An L-shaped support arm 56 is fixed above the rotating arm 51. A tensioning wheel 55 is set in the middle position of the support arm 56, a driven wheel 57 is set at the lower end of the support arm, and a counterweight block 52 is set at the upper end of the support arm; the polishing motor 57 is fixed on the rotating arm 51, and the output shaft of the polishing motor is connected to the driving wheel 53. The polishing belt 50 passes around the tensioning wheel 55, the driven wheel 57 and the driving wheel 53; part of the outer side surface of the polishing belt abuts against the outer side surface of the crankshaft.

[0036] A deep groove ball bearing 44 is disposed on the outer side of the eccentric wheel 45, and the deep groove ball bearing abuts against the inner side of the second guide rail 102; thus, the position of the mobile platform 4 perpendicular to the direction of the second guide rail can be adjusted by rotating the eccentric wheel;

[0037] like Figure 8-1 and Figure 8-2 As shown, the rotating shaft 551 of the tensioning wheel 55 is arranged on the slider 58, the slider is arranged in the slide seat 583, and the slide seat 583 is fixed on the support arm 56;

[0038] The slide block 58 is provided with a vertical T-slot 582 , the upper end of the upper and lower adjustment bolts 581 are screwed to the hand wheel 59 , and the lower end of the upper and lower adjustment bolts 581 are screwed to the T-slot 582 .

[0039] The counterweight blocks are multiple pieces, which are fixed into one piece by bolts.

[0040] The reducer 61 is a cycloidal reducer, and a pinion 62 is installed at the output end of the cycloidal reducer. The pinion 62 is meshed with the outer gear of the dial 63 .

[0041] In order to ensure the fixation of the mobile platform, a braking device is also included, which includes a clamping block 48, which is fixed to the end of the mobile platform, and the clamping block is provided with a groove 481, which is provided on the outer side of the second guide rail 102, and a bolt hole is provided on one side of the clamping block, and the brake bolt 47 is rotated through the bolt hole and abuts against the second rail.

[0042] The present invention utilizes the centers of the tailstock at both ends to position the center of the crankshaft and tighten it to be suspended in the air, and uses a dial transmission method to rotate the crankshaft. Therefore, compared with a method in which one end of the crankshaft is clamped by a chuck and the other end is centered, the structure is simple and the centering effect is good, avoiding the need to configure an additional rotation drive device.

[0043] In order to realize automatic operation, a PLC is also provided, and the PLC is connected to each motor so that the rotation speed of the polishing belt can be automatically controlled; the present invention can adjust the pressure applied to the crankshaft surface during the polishing process by pre-adjusting the counterweight block.

[0044] The rotating shaft of the eccentric wheel can also be connected to the output shaft of the servo motor, and the radial position of the mobile platform along the crankshaft is adjusted by the rotation of the servo motor, thereby adjusting the polishing pressure; and the servo motor is also connected to the PLC.

Claims

1. A marine crankshaft polishing machine, comprising a bed, characterized in that: A first guide rail and a second guide rail are arranged on the bed, and the first guide rail and the second guide rail are parallel; a tailstock moving plate is arranged at one end of the first guide rail, a tailstock is fixedly arranged on the tailstock moving plate, and a fixed tailstock is arranged at the other end of the first guide rail; a driving device is fixedly arranged above the fixed tailstock; a moving platform is arranged on the second guide rail, and a polishing arm is arranged on the moving platform; The tailstock moving plate is provided with a stroke adjustment device, the stroke adjustment device comprises a bearing, the bearing is fixed on a bearing support plate, one end of the bearing support plate is axially connected to the bottom plate, the other end of the bearing support plate is abutted against an adjustment bolt, and the adjustment bolt is screwed into a screw hole on the bottom plate; the tailstock is fixed to the bottom plate by bolts; A positioning hole is provided at the lower side of the tailstock moving plate facing away from the fixed tailstock, a positioning block is inserted into the positioning hole, a screw hole is provided on the positioning block, a positioning bolt is tightened in the screw hole and abuts against the tailstock moving plate; The driving device includes a rotating motor and a reducer, the rotating motor is connected to the reducer, the output shaft of the reducer is connected to the dial through a gear, a lever is installed on the surface of the dial, and the lever is embedded in the end of the crankshaft to drive the crankshaft to rotate; A roller is arranged on the support plate below the movable platform, and the roller rolls on the second guide rail; the cross section of the second guide rail is a U-shape with the opening facing outward, the inner side of the second guide rail abuts against the eccentric wheel, and the eccentric wheel is fixed on the support plate; the upper side of the movable platform is connected to the polishing arm by bolts; The polishing arm includes a frame, and the frame includes a rotating arm. The rotating arm is axially connected to a bracket fixed on a mobile platform. An L-shaped support arm is fixed above the rotating arm. A tensioning wheel is arranged in the middle position of the support arm, a driven wheel is arranged at the lower end of the support arm, and a counterweight block is arranged at the upper end of the support arm. The polishing motor is fixed on the rotating arm, and the output shaft of the polishing motor is connected to the driving wheel. The polishing belt passes around the tensioning wheel, the driven wheel and the driving wheel. Part of the outer side surface of the polishing belt abuts against the outer side surface of the crankshaft.

2. The marine crankshaft polishing machine according to claim 1, characterized in that: A deep groove ball bearing is arranged on the outer side of the eccentric wheel, and the deep groove ball bearing abuts against the inner side of the second guide rail.

3. The marine crankshaft polishing machine according to claim 1, characterized in that: The rotating shaft of the tension wheel is arranged on a slide block, a vertical T-slot is arranged on the slide block, the upper ends of the upper and lower adjusting bolts are screwed to the hand wheel, and the lower ends of the upper and lower adjusting bolts are screwed to the T-slot.

4. The marine crankshaft polishing machine according to claim 1, characterized in that: The counterweight blocks are multiple pieces, which are fixed into one piece by bolts.

5. The marine crankshaft polishing machine according to claim 1, characterized in that: The reducer is a cycloidal reducer, and a pinion is installed at the output end of the cycloidal reducer, and the pinion is meshed with the outer gear of the dial.

6. The marine crankshaft polishing machine according to claim 1, characterized in that: The mobile platform also includes a brake device, which includes a clamping block. A bolt hole is arranged on one side of the clamping block. The brake bolt is rotated through the bolt hole and abuts against the second track.

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