Rotor dynamic balance measurement and automatic correction system and process flow method

Abstract

The invention relates to the technical field of oil pump rotors, in particular to a rotor dynamic balance measurement and automatic correction system and a technological process method.The system comprises a marble platform, the marble platform is provided with a rotor positioning unit, and an oil pump rotor is installed on the rotor positioning unit; the dynamic balance measuring unit is matched with the rotor positioning unit to measure the unbalance size and phase of the oil pump rotor; a size measuring unit is arranged on the laser material reducing unit, and laser material reducing machining and laser polishing treatment are carried out according to data measured by the dynamic balance measuring unit in cooperation with the rotor positioning unit; a negative pressure dust removal unit; and the workpiece cooling unit is used for cooling the subtractive machining part of the oil pump rotor. Dynamic balance detection, laser correction and machining area size measurement of the oil pump rotor can be achieved, full automation in the treatment process is achieved, the precision and efficiency of dynamic balance of the rotor are improved, and meanwhile the surface quality of the rotor workpiece after material reduction machining can be effectively controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of oil pump rotors, and in particular to a rotor dynamic balance measurement and automatic correction system and a process method. Background Art

[0002] When the oil pump rotor in the oil pump rotates at high speed, the uneven distribution of the rotor mass will reduce the life of the rotor support shaft, and bring vibration problems and interference torque, aggravate the wear of bearings and other parts, and affect the working performance of the oil pump. Therefore, the oil pump rotor needs to be dynamically balanced during the overhaul of the oil pump. The oil pump rotor with the remaining unbalance exceeding the specified requirements needs to be measured on the specified weight-removing surface (such as Figure 1 Subtractive machining is performed on the rotor (shown on surfaces C and D) to ensure that the residual unbalance of the rotor meets the requirements for use. At the same time, the metal material removal depth, surface roughness of the subtractive machining, and chamfer dimensions of the transition area of ​​the subtractive machining should meet the specified requirements.

[0003] The oil pump rotor also needs to be dynamically balanced before it is manufactured and shipped out of the factory. Some metal material on the surface of the rotor impeller is removed as appropriate to ensure that the remaining imbalance meets the requirements. After a life cycle of use, the oil pump rotor needs to be disassembled again, the necessary parts such as the stop gasket are replaced, and it needs to be reassembled and undergo dynamic balancing inspection and material reduction processing.

[0004] The conventional dynamic balancing process is as follows: 1. Use a dynamic balancing machine to detect the magnitude and phase of the oil pump rotor's imbalance; 2. Determine and mark the area of ​​the part's surface to be reduced and the depth of material removal by applying plasticine to the rotor surface (generally avoiding the original machine's reduced material processing area); 3. Remove the oil pump rotor from the dynamic balancing machine and remove excess metal material from the marked area through machining; 4. Use the dynamic balancing machine again to detect the magnitude and phase of the oil pump rotor's imbalance. If the remaining imbalance still does not meet the specified requirements, repeat steps 2 to 4 until the rotor's remaining imbalance meets the requirements; 5. Remove the oil pump rotor from the dynamic balancing machine and use measuring tools such as a depth gauge, surface roughness gauge, and chamfering fixture to measure the depth of metal material removed from the oil pump rotor surface, the surface roughness of the reduced material, and the chamfer dimensions of the transition area of ​​the reduced material processing. Because the reduced material area of ​​the oil pump rotor must be determined by the operator by applying plasticine to the rotor surface, the operator's repair experience has a significant impact on the accuracy of the rotor's reduced material processing area, potentially raising the risk of product repair quality. In addition, the oil pump rotor imbalance measurement process, mechanical subtractive processing process, and dimension measurement process are independent of each other. During the mechanical deweighting process, there is a risk of damage to the substrate due to mechanical stress, vibration, debris, etc.

[0005] In summary, the traditional oil pump rotor dynamic balancing detection and subtractive machining process has problems such as low efficiency, long cycle, and high dependence on the operator's skill level, which has a great impact on the oil pump repair cycle and repair quality. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention proposes a rotor dynamic balance measurement and automatic correction system and process method.

[0007] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0008] A rotor dynamic balance measurement and automatic correction system includes a steel frame, a marble platform arranged on the steel frame, and the marble platform is provided with:

[0009] Rotor positioning unit, the oil pump rotor is installed on the rotor positioning unit;

[0010] The dynamic balancing measurement unit is located in front of the rotor positioning unit and works with the rotor positioning unit to measure the imbalance size and phase of the oil pump rotor;

[0011] A laser subtractive unit is located at the rear side of the rotor positioning unit and is provided with a dimension measuring unit. The laser subtractive unit cooperates with the rotor positioning unit to perform laser subtractive processing and laser polishing according to the data measured by the dynamic balancing measuring unit.

[0012] A negative pressure dust removal unit is located on the right side of the rotor positioning unit and is used to collect particles generated when the laser subtractive unit is working;

[0013] The workpiece cooling unit is located on the left side of the rotor positioning unit and is used to cool the subtractive processing part of the oil pump rotor.

[0014] As a further improvement of the present invention, the rotor positioning unit includes a vibration measuring stand and a driving servo motor arranged on a marble platform, a support stand arranged on the vibration measuring stand, a rotor positioning ejector mechanism located on the right side of the support stand, and a pulley connected to the driving servo motor. The oil pump rotor is installed on the support stand, and a drive belt is connected between the pulley and the rotating shaft of the oil pump rotor.

[0015] As a further improvement of the present invention, the dynamic balancing measurement unit includes a vibration sensor and a wheel speed sensor arranged on a marble platform. The vibration sensor is located on the front side of the vibration measuring platform. A wheel speed sensor mounting bracket is provided on the marble platform. The wheel speed sensor is installed on the wheel speed sensor mounting bracket and is located on the rear side of the oil pump rotor.

[0016] As a further improvement of the present invention, the laser subtractive unit includes a guide stand arranged on a marble platform, a fixed-focus displacement stand installed on the guide stand, and a laser head installed on the fixed-focus displacement stand.

[0017] As a further improvement of the present invention, the dimension measuring unit is an image measuring instrument, and the image measuring instrument is arranged on a fixed-focus displacement stage.

[0018] As a further improvement of the present invention, the negative pressure dust removal unit includes a dust removal contact head close to the machined surface of the oil pump rotor, a dust suction pipeline connected to the dust removal contact head, and a dust collection box connected to the dust suction pipeline.

[0019] As a further improvement of the present invention, the workpiece cooling unit is a turbine air duct.

[0020] A rotor dynamic balance measurement and automatic correction process method, using the above-mentioned rotor dynamic balance measurement and automatic correction system, includes the following steps:

[0021] Step 1: The operator uses a black marker to mark the surface of the oil pump rotor after subtractive machining;

[0022] Step 2: Place the rotating shaft of the oil pump rotor on the support stand, position it with the rotor positioning ejector mechanism, and connect the drive belt to the rotating shaft of the oil pump rotor;

[0023] Step 3: Use an image measuring instrument to measure the fan-shaped area where the original oil pump rotor has been subtracted, and mark the fan-shaped area as "occupied". Laser subtractive processing cannot be repeated in the future.

[0024] Step 4: The vibration sensor and wheel speed sensor in the dynamic balancing measurement unit measure the dynamic balance of the oil pump rotor, obtain the remaining imbalance of the oil pump rotor and make a qualified judgment. The surface of the unqualified oil pump rotor is laser subtractive processed to correct the rotor;

[0025] Step 5: Drive the servo motor to rotate the surface to be subtracted on the oil pump rotor to the laser processing area through the pulley and drive belt. The laser head in the laser subtractive unit performs subtractive processing on the surface to be subtracted on the oil pump rotor. The particles generated during the processing are collected by the dust removal contact head in the negative pressure dust removal unit and cooled by the cooling unit.

[0026] Step 6: After laser subtractive processing, restart the dynamic balancing measurement unit twice to measure the residual imbalance of the oil pump rotor. The residual imbalance should meet the technical requirements and output the dynamic balancing test report.

[0027] Step 7: Use an image measuring instrument to measure the size of the oil pump rotor laser subtractive processing area, material removal depth, subtractive processing surface roughness, and subtractive processing transition area chamfer size, which should meet the technical requirements, and output a dimensional measurement test report;

[0028] Step 8: Remove the oil pump rotor.

[0029] The beneficial effects of the present invention are:

[0030] The present invention provides a rotor dynamic balancing measurement and automatic correction system and process flow method, capable of performing dynamic balancing detection, laser correction, and machining area dimension measurement on oil pump rotors. This system effectively achieves full automation of the process, eliminating manual operations, improving the accuracy and efficiency of rotor dynamic balancing while effectively controlling the surface quality of the rotor workpiece after subtractive machining. A negative pressure dust removal unit effectively removes dust generated during subtractive machining, while a workpiece cooling unit effectively reduces the risk of temperature rise-induced deformation of the oil pump rotor structure. The present invention can be applied to rotor dynamic balancing detection and correction measurement processes in the repair field, offering promising application prospects and significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0032] Figure 1 Schematic diagram of the oil pump rotor structure. Surfaces A and B are the rotating support surfaces, and surfaces C and D are the weight-removing surfaces.

[0033] Figure 2 Schematic diagram of the system structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the oil pump rotor machining surface area division. The C surface is divided into M sectors. The marker mark is used as the starting point. The sector where the original machine has been subtracted is marked as "occupied" and cannot be repeatedly laser subtracted in the future.

[0035] Figure 4 This is a schematic diagram of the oil pump rotor machining surface area division. The D surface is divided into N sectors. The marker pen mark is used as the starting point. The sector where the original machine has been subtracted is marked as "occupied" and cannot be repeatedly laser subtracted in the future.

[0036] Figure 5 Schematic diagram of the effect of beam shaping on the surface morphology of laser subtractive machining.

[0037] In the figure: 1. Steel frame; 2. Marble platform; 3. Guide frame; 4. Fixed-focus displacement frame; 5. Dust removal contact head; 6. Vibration sensor; 7. Dust suction pipe; 8. Dust collection box; 9. Laser head; 10. Image measuring instrument; 11. Rotor positioning ejector mechanism; 12. Support frame; 13. Oil pump rotor; 14. Drive servo motor; 15. Wheel speed sensor; 16. Drive belt; 17. Pulley; 18. Vibration frame; 19. Turbine air duct; 20. Wheel speed sensor mounting bracket. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0039] like Figure 2 As shown, a rotor dynamic balance measurement and automatic correction system includes a steel stand 1, a marble platform 2, a rotor positioning unit, a dynamic balance measurement unit, a laser material reduction unit, a negative pressure dust removal unit and a workpiece cooling unit.

[0040] The steel frame 1 supports the marble platform 2, which is used to house the rotor positioning unit, dynamic balancing measurement unit, laser subtraction unit, negative pressure dust removal unit, and workpiece cooling unit. The marble platform 2 has excellent vibration damping properties. The rotor positioning unit, mounted on the marble platform 2, drives the oil pump rotor 13 in directional rotation and positioning, rotating the portion of the oil pump rotor 13 to be subtracted into the working area of ​​the laser subtraction unit. The dynamic balancing measurement unit, located in front of the rotor positioning unit, works in conjunction with the rotor positioning unit to measure the magnitude and phase of the imbalance of the oil pump rotor 13. The laser subtraction unit, located behind the rotor positioning unit, performs laser subtraction and polishing on the unbalanced surface of the oil pump rotor 13 based on the data measured by the dynamic balancing measurement unit and in conjunction with the rotor positioning unit. The negative pressure dust removal unit and the workpiece cooling unit, located on the right and left sides of the rotor positioning unit, respectively, collect particles generated during the laser subtraction process and cool the processed surface.

[0041] As a further improvement of this embodiment, the rotor positioning unit includes a rotor positioning ejector mechanism 11 , a support stand 12 , a drive servo motor 14 , a drive belt 16 , a pulley 17 and a vibration measuring stand 18 .

[0042] The support stand 12 is set on the vibration test stand 18, the oil pump rotor 13 is installed on the support stand 12, the driving servo motor 14 is located on the rear side of the vibration test stand 18 and is connected to the pulley 17, and the two ends of the driving belt 16 are respectively connected to the pulley 17 and the rotating shaft on the oil pump rotor 13. Through the pulley 17 and the driving belt 16, the driving belt 16 can drive the oil pump rotor 13 to rotate for positioning and rotation to the laser processing area and dynamic balance measurement.

[0043] As a further improvement of this embodiment, the dynamic balance measurement unit includes a vibration sensor 6 , a wheel speed sensor 15 , and a wheel speed sensor mounting bracket 20 .

[0044] The wheel speed sensor mounting bracket 20 is located on the front side of the vibration test stand 18. The wheel speed sensor 15 is mounted on the wheel speed sensor mounting bracket 20. The mounting position of the wheel speed sensor 15 can be moved horizontally or adjusted vertically. The vibration sensor 6 is located on the rear side of the vibration test stand 18 and is used to measure the vibration generated by the rotation of the oil pump rotor 13.

[0045] As a further improvement to this embodiment, the laser subtractive unit includes a guide stage 3, a fixed-focus displacement stage 4, and a laser head 9. The fixed-focus displacement stage 4 is mounted on the guide stage 3 and can be adjusted in height up and down; the laser head 9 is mounted on the fixed-focus displacement stage 4. Two sets of laser heads 9 are provided and symmetrically mounted on the fixed-focus displacement stage 4. The laser heads 9 can move horizontally.

[0046] Furthermore, a dimension measuring unit is also provided on the fixed-focus displacement stage 4 in the laser subtractive unit. In this embodiment, the dimension measuring unit is an image measuring instrument 10, which can accurately measure the subtractive processing area size, material removal depth, subtractive processing surface roughness, and subtractive processing transition area chamfer size of the oil pump rotor 13.

[0047] As a further improvement of this embodiment, the negative pressure dust removal unit includes a dust removal contact head 5, a dust suction line 7, and a dust collection box 8. The dust removal contact head 5 is close to the processed surface of the oil pump rotor 13 and is contoured according to the surface shape of the oil pump rotor 13 to ensure that it fits more closely with the processed surface of the oil pump rotor 13. Considering that the residue generated by laser subtractive processing may splash and damage the dust removal contact head 5, the dust removal contact head can be made of high-temperature resistant materials such as polytetrafluoroethylene. The dust suction line 7 is connected to the dust removal contact head 5 and is used to transport the particles generated by laser subtraction; the dust collection box 8 is connected to the dust suction line 7 and is used to store the particles. It has a built-in filter element and a detachable dust collection box for easy cleaning and maintenance.

[0048] As a further improvement to this embodiment, the workpiece cooling unit is a turbine duct 19. The turbine duct 19 is used to continuously blow cold air to cool the subtractive processing area of ​​the oil pump rotor 13. The principle of high-speed eddy current is used to convert room temperature compressed air into cold air. The principle of air convection is used to remove the heat generated during the processing, thereby preventing local overheating of the oil pump rotor 13. To ensure that the local temperature rise of the oil pump rotor 13 does not exceed the specified temperature, the air outlet volume and cold air temperature of the turbine duct can be determined through simulation calculations. The cooling effect can be monitored in real time by an infrared thermometer. If there is an abnormal temperature rise, a warning signal can be fed back to the control system, automatically stopping the laser subtractive processing and issuing an alarm prompt to prevent abnormal temperature rise from damaging the oil pump rotor 13.

[0049] A rotor dynamic balance measurement and automatic correction process method, using the above-mentioned rotor dynamic balance measurement and automatic correction system, includes the following steps:

[0050] Step 1: The operator uses a black marker to mark the surface of the oil pump rotor 13 that has been processed.

[0051] Specifically, such as Figure 3 and Figure 4 As shown, the C and D surfaces of the oil pump rotor 13 processed by subtractive machining are evenly divided into M and N sector-shaped areas, and numbered in a clockwise direction starting from the black marker mark (C surface i=1~M, D surface i=1~N).

[0052] Step 2: Place the rotating shaft of the oil pump rotor 13 on the support stand 12 , position it using the rotor positioning ejector mechanism 11 , and connect the drive belt 16 to the rotating shaft of the oil pump rotor 13 .

[0053] Step 3: Use the image measuring device 10 to measure the fan-shaped area of ​​the oil pump rotor 13 where the material has been removed. This fan-shaped area is marked as "occupied," and subsequent laser subtractive machining is prohibited. This method prevents the rotor from re-machining the material removal area, which may result in excessive material removal depth.

[0054] Step 4: The vibration sensor 6 and wheel speed sensor 15 in the dynamic balancing unit perform dynamic balancing on the oil pump rotor 13, obtaining the residual imbalance of the oil pump rotor 13 and determining whether it is acceptable. Laser subtractive machining is performed on the surface of any unacceptable oil pump rotor 13 to correct the rotor. If the rotor passes, the corresponding data is recorded, and laser subtractive machining is not required.

[0055] Step 5: Drive the servo motor 14 to rotate the surface to be reduced on the oil pump rotor 13 to the laser processing area through the pulley 17 and the drive belt 16. The laser head 9 in the laser subtraction unit performs subtraction processing on the surface to be reduced on the oil pump rotor 13. The particles generated during the processing are collected by the dust removal contact head 5 in the negative pressure dust removal unit and cooled by the cooling unit.

[0056] Specifically, during the laser subtraction process of the laser head 9, the surface material removal of the specified area is achieved by planning the galvanometer scanning shape and adjusting the filling trajectory planning method: the galvanometer scanning trajectory is set to a vertical line, and while the laser subtractive processing is being performed, the servo motor is controlled to drive the workpiece to rotate synchronously, performing on-the-go subtractive processing, expanding the subtractive processing area, and achieving surface subtractive processing in a larger range.

[0057] In view of the large surface roughness value of laser subtractive processing, the beam shaping and polishing adjustment methods are adopted. Through beam shaping, the pointed light spot is adjusted to a flat-top light spot so that the light intensity is evenly distributed on the subtractive processing surface. In the process of laser subtractive processing, a polishing adjustment process is added. Through low-power adjustment of the laser, the burrs and remelting layer structures remaining in the subtractive processing are vaporized, so that the subtractive processing surface is smooth and flat, and the surface roughness of the subtractive processing is reduced. A rotor processing model is established, the model is layered and sliced, and the laser path is planned layer by layer. Through laser layered processing, smooth chamfers in the processing transition area are achieved and the depth of metal material removal is guaranteed. Using the "high-frequency and low-energy" laser scanning strategy, the metal material of the protruding part of the processing step is melted by accumulating laser energy and re-solidified, making the processing step part smoother. The comparison effect is as follows. Figure 5 shown.

[0058] Step 6: After laser subtractive processing, the dynamic balancing measurement unit is restarted twice to measure the residual unbalance of the oil pump rotor 13. The residual unbalance should meet the technical requirements, and a dynamic balancing test report is output.

[0059] Step 7: Use the image measuring instrument 10 to measure the laser subtractive processing area size, material removal depth, subtractive processing surface roughness, and subtractive processing transition area chamfer size of the oil pump rotor 13, which should meet the technical requirements, and output a dimensional measurement test report;

[0060] Step 8: Remove the oil pump rotor 13.

[0061] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and description merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotor dynamic balance measurement and automatic correction system, characterized by: The invention comprises a steel frame (1), a marble platform (2) arranged on the steel frame (1), and the marble platform (2) is provided with: A rotor positioning unit, on which the oil pump rotor (13) is mounted; A dynamic balancing measurement unit is located in front of the rotor positioning unit and cooperates with the rotor positioning unit to measure the imbalance size and phase of the oil pump rotor (13); A laser subtractive unit is located at the rear side of the rotor positioning unit and is provided with a dimension measuring unit. The laser subtractive unit cooperates with the rotor positioning unit to perform laser subtractive processing and laser polishing according to the data measured by the dynamic balancing measuring unit. A negative pressure dust removal unit is located on the right side of the rotor positioning unit and is used to collect particles generated when the laser subtractive unit is working; The workpiece cooling unit is located on the left side of the rotor positioning unit and is used to cool the subtractive processing part of the oil pump rotor (13).

2. A rotor dynamic balance measurement and automatic correction system according to claim 1, characterized in that: The rotor positioning unit comprises a vibration test stand (18) and a driving servo motor (14) arranged on a marble platform (2), a support stand (12) arranged on the vibration test stand (18), a rotor positioning ejector mechanism (11) located on the right side of the support stand (12), and a pulley (17) connected to the driving servo motor (14); an oil pump rotor (13) is mounted on the support stand (12), and a driving belt (16) is connected between the pulley (17) and the rotating shaft of the oil pump rotor (13).

3. The rotor dynamic balance measurement and automatic correction system according to claim 1, characterized in that: The dynamic balance measurement unit comprises a vibration sensor (6) and a wheel speed sensor (15) arranged on a marble platform (2); the vibration sensor (6) is located on the front side of a vibration measuring stand (18); a wheel speed sensor mounting frame (20) is provided on the marble platform (2); and the wheel speed sensor (15) is mounted on the wheel speed sensor mounting frame (20) and is located on the rear side of an oil pump rotor (13).

4. The rotor dynamic balance measurement and automatic correction system according to claim 1, characterized in that: The laser material reduction unit comprises a guide stand (3) arranged on a marble platform (2), a fixed-focus displacement stand (4) mounted on the guide stand (3), and a laser head (9) mounted on the fixed-focus displacement stand (4).

5. A rotor dynamic balance measurement and automatic correction system according to claim 4, characterized in that: The dimension measuring unit is an image measuring instrument (10), and the image measuring instrument (10) is arranged on a fixed-focus displacement stage (4).

6. The rotor dynamic balance measurement and automatic correction system according to claim 1, characterized in that: The negative pressure dust removal unit comprises a dust removal contact head (5) close to the machining surface of the oil pump rotor (13), a dust suction pipeline (7) connected to the dust removal contact head (5), and a dust collection box (8) connected to the dust suction pipeline (7).

7. The rotor dynamic balance measurement and automatic correction system according to claim 1, characterized in that: The workpiece cooling unit is a turbine air duct (19).

8. A rotor dynamic balance measurement and automatic correction process method, characterized by: A rotor dynamic balancing measurement and automatic correction system according to any one of claims 1 to 7 comprises the following steps: Step 1: The operator uses a black marker pen to mark the surface of the oil pump rotor (13) after material reduction processing; Step 2: Place the rotating shaft of the oil pump rotor (13) on the support stand (12), position it using the rotor positioning ejector mechanism (11), and connect the drive belt (16) to the rotating shaft of the oil pump rotor (13); Step 3: Use the image measuring instrument (10) to measure the fan-shaped area of ​​the oil pump rotor (13) where the original material reduction part is located, and mark the fan-shaped area as "occupied". The laser material reduction processing cannot be repeated in the future. Step 4: The vibration sensor (6) and the wheel speed sensor (15) in the dynamic balancing measurement unit perform dynamic balancing measurement on the oil pump rotor (13), obtain the residual unbalance amount of the oil pump rotor (13) and make a qualified judgment, and perform laser subtractive processing on the surface of the unqualified oil pump rotor (13) to correct the rotor; Step 5: driving the servo motor (14) to rotate the surface to be reduced on the oil pump rotor (13) to the laser processing area via the pulley (17) and the drive belt (16); the laser head (9) in the laser reduction unit performs reduction processing on the surface to be reduced on the oil pump rotor (13); particles generated during the processing are collected by the dust removal contact head (5) in the negative pressure dust removal unit and cooled by the cooling unit; Step 6: After laser subtractive processing, the dynamic balance measurement unit is repeatedly started twice to measure the remaining unbalance of the oil pump rotor (13) to meet the technical requirements, and a dynamic balance detection report is output; Step 7: Using an image measuring instrument (10), the laser subtractive processing area size, material removal depth, subtractive processing surface roughness, and subtractive processing transition area chamfer size of the oil pump rotor (13) should meet the technical requirements, and a dimensional measurement inspection report should be output; Step 8: Remove the oil pump rotor (13).

Images