A method and system for detecting inner hole shape of multi-oil blade

Abstract

The present invention relates to the technical field of multi-oil blade detection, and discloses a multi-oil blade inner hole shape line detection method and detection system. The detection system includes a placement tube, and the multi-oil blade is placed on the outside of the placement tube in a sleeve, and also includes a detection cylinder, a telescopic arm, a rotating motor and a control unit. The detection cylinder is arranged in the upper part of the placement tube for lateral translation, and the telescopic arm is translated radially along the detection cylinder. The rotating motor drives the detection cylinder to rotate. The pressurization chamber and the detection chamber are both provided with pressure sensors. The telescopic arm includes an arm body, a detection head and a piezoelectric sensor. The detection method includes the following steps: S1, centering and positioning, S2, measuring the radius of the inner hole circle segment, S3, measuring the radius of the inner hole, and S4, obtaining the inner hole shape line. The purpose of the present invention is to solve or at least alleviate the problem of complex operation and the need for recalibration and positioning when using a three-coordinate measuring instrument to detect the inner hole shape line of multi-oil blades, while ensuring the accuracy of the measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-oil blade detection, and in particular to a multi-oil blade inner hole shape line detection method and detection system. Background Art

[0002] The bearing is the part where the sliding bearing and the shaft neck contact. It is in the shape of a cylindrical surface in the shape of a tile and is generally made of alloy wear-resistant materials. There are two types of bearings: integral and split. The integral bearing is usually called a sleeve. The integral bearing has two types: oil-free and oil-free. The bearing and the shaft neck are matched with clearance and generally do not rotate with the shaft. When the sliding bearing is working, a very thin oil film is required between the bearing and the shaft for lubrication. The inner hole shape of the multi-oil blade bearing affects the thickness of the oil film. If the inner hole shape is small, the oil film is thin, and direct friction is easy to occur between the bearing and the shaft. Friction will generate very high temperatures. Although the bearing is made of a special high-temperature resistant alloy material, the high temperature generated by direct friction is still enough to burn it. The bearing may also burn due to factors such as excessive load, high temperature, impurities in the lubricating oil, or abnormal viscosity. If the inner hole shape is larger, the oil film is thicker, which not only causes inaccurate shaft positioning, but also makes it easy for the lubricating oil to seep out of the gap between the bearing and the shaft, reducing the service life of the lubricating oil. When the lubricating oil is insufficient, direct friction will also occur.

[0003] At present, three-coordinate measuring instruments are mostly used to detect the inner hole shape of multi-oil blades. For example, the invention patent with announcement number CN114136184 discloses a method and equipment for measuring the taper and size of the inner diameter oil guide groove of the bearing ring based on three-coordinate measurement. First, the Z-axis and X-axis directions of the workpiece coordinate system are determined by the end face of the ring, and the workpiece coordinate system is established. In the workpiece coordinate system, a cone is generated. The cone angle of the cone needs to be inferred from the taper on the drawing. The cone angle of the corresponding cone is then called. The cone and plane intersection command is then called to make the end face of the ring intersect with the oil guide groove cone to obtain the size of the inner diameter oil guide groove; the two cross-sectional circles corresponding to the height difference are measured in the inner diameter groove cone, and then the taper of the inner diameter oil guide groove is calculated. It is mainly used for measuring the inner diameter oil guide groove of the bearing ring.

[0004] Although the three-coordinate measuring machine can accurately measure the inner hole shape line, the measurement path planning is time-consuming when using the three-coordinate measuring machine for inspection. Since the probe needs to make mechanical movement during the measurement process, it takes a lot of time to plan the measurement path. When the three-coordinate measuring machine measures different multi-oil blades, the multi-oil blades need to be repositioned, so the probe needs to be recalibrated for positioning. The operation is relatively cumbersome and complicated, and requires specialized technicians to operate. Compared with other measuring instruments, the price and maintenance cost of the three-coordinate measuring machine are relatively high, so its general applicability is poor. Summary of the invention

[0005] The present invention provides a method and system for detecting the inner hole shape line of a multi-oil blade, aiming to overcome the deficiencies in the prior art and solve or at least alleviate the problem of complex operation and the need for recalibration and positioning when using a three-coordinate measuring instrument to detect the inner hole shape line of a multi-oil blade.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multi-oil blade inner hole shape line detection system, comprising a placement cylinder, the multi-oil blade is placed on the outside of the placement cylinder, and also comprises a detection cylinder, a telescopic arm, a rotating motor and a control unit, the detection cylinder is a vertically arranged cylindrical shell, the detection cylinder is arranged in the upper part of the placement cylinder for transverse translation, the telescopic arm is translated radially along the detection cylinder, the number of telescopic arms is equal to the number of oil blades of the multi-oil blade, and the rotating motor drives the detection cylinder to rotate;

[0007] The detection cylinder includes a pressurizing chamber and a plurality of detection chambers. The number of the detection chambers is equal to the number of the telescopic arms and is arranged one by one. The volumes of all the detection chambers are equal. The pressurizing chamber is connected to each detection chamber separately. Both the pressurizing chamber and the detection chamber are provided with a pressure sensor. The pressure sensor outputs the pressure signal in the pressurizing chamber or the detection chamber to the outside. A solenoid valve is provided at the connection between the pressurizing chamber and each detection chamber.

[0008] The telescopic arm comprises an arm body, a detection head and a piezoelectric sensor. The rear end of the arm body is sealed and slidably disposed in the detection cavity. The detection head is disposed at the head end of the arm body. The detection head extends outward from the detection cavity and abuts against the inner hole wall of the multi-oil blade. The piezoelectric sensor is disposed between the detection head and the arm body. The piezoelectric sensor outputs a voltage signal according to the pressure of the detection head abutting against the inner hole wall of the multi-oil blade.

[0009] The control unit calculates the diameter value of the inner hole of the multi-oil blade at the telescopic arm according to the pressure signal and the voltage signal, and obtains the shape line of the inner hole of the multi-oil blade at the height position of the telescopic arm.

[0010] In order to further realize the present invention, the following technical solutions may be preferably selected:

[0011] Preferably, a transverse partition is transversely arranged in the middle of the detection cylinder, a longitudinal partition is arranged at the lower part of the detection cylinder, the cross section of the longitudinal partition is cross-shaped, four guide sleeves are arranged along the radial direction of the lower part of the detection cylinder, and the four guide sleeves and the four straight line segments of the longitudinal partition are arranged alternately;

[0012] The space above the transverse partition in the detection cylinder forms a pressurized chamber, and the top of the detection cylinder is connected to the air source.

[0013] Preferably, a piston plate is provided at the rear end of the arm body, and the piston plate is sealingly slidably sleeved in the guide sleeve. The space at the lower part of the detection cylinder and between two adjacent plates of the longitudinal partition and the space in the guide sleeve and located on the side of the piston plate facing the detection cylinder together form a detection chamber.

[0014] Preferably, it also includes a positioning component, which includes a positioning plate and a lower base plate. The lower base plate is in the shape of a circular flat plate and is laterally fixed in the middle of the placement cylinder. The positioning plate is slidably arranged on the upper surface of the lower base plate. The rotating motor is coaxially installed above the positioning plate. The output shaft of the rotating motor is embedded in the bottom of the detection cylinder and is coaxially arranged with the detection cylinder.

[0015] Preferably, the positioning assembly also includes an upper ring plate and a piston ring. The upper ring plate is in the shape of an annular flat plate. The upper ring plate is laterally fixed in the placement tube and is located above the positioning plate. An annular guide cavity is coaxially arranged in the positioning plate. The piston ring is longitudinally sealed and slidably arranged in the guide cavity. The upper part of the piston ring extends upward from the positioning plate and abuts against the upper ring plate. The bottom of the guide cavity is connected to the air source.

[0016] Preferably, it further comprises a connecting assembly, wherein the connecting assembly comprises an upper connecting seat and a lower connecting seat, and the upper connecting seat and the lower connecting seat are hinged to each other;

[0017] The rotating motor is fixedly arranged on the upper part of the upper connecting seat, an integrally formed connecting block is arranged at the center of the lower side of the upper connecting seat, and a spherical segment-shaped connecting groove is arranged at the center of the connecting block;

[0018] The upper connecting seat is located at the center of the upper side of the positioning plate. An upwardly protruding connecting ball is arranged at the center of the upper connecting seat. The connecting ball is rotatably embedded in the connecting groove.

[0019] Preferably, a section of the connecting ball located in the connecting groove is provided with a plurality of push rods, the push rods are sealingly and slidably arranged in the connecting ball, the heads of the push rods extend outward from the connecting ball and abut against the connecting groove, and the bottom of the internal space of the connecting ball is connected to the bottom of the guide cavity of the positioning plate.

[0020] Preferably, a placement plate is sleeved on the outer side of the placement tube, and the placement plate is lifted and lowered along the height direction of the placement tube.

[0021] A method for detecting the inner hole shape of a multi-oil blade comprises the following steps:

[0022] S1. Centering and positioning, placing the multi-oil blade. Direct the end of the telescopic arm toward the circular section of the inner hole of the multi-oil blade, start the air source, and ventilate and pressurize the pressurized chamber. At this time, the pressurized chamber and the detection chamber are in a connected state, and the pressure of the detection chamber and all the detection chambers are consistent and increase at the same time. As the pressure in the detection chamber increases, the telescopic arm extends outward and reaches the multi-oil blade. Since the pressure in all the detection chambers is the same, the extension amount of all telescopic arms will tend to be consistent, driving the detection cylinder to translate in the placement cylinder. When the voltage signals output by the piezoelectric sensors of all telescopic arms are equal, the axis of the detection cylinder coincides with the axis of the multi-oil blade.

[0023] S2, measure the radius of the inner hole circle segment, the air source continues to ventilate and pressurize the pressurized chamber until the control unit monitors that the voltage signal output by the piezoelectric sensor reaches the set value U0, closes the solenoid valve between the pressurized chamber and the detection chamber and turns off the air source, the pressure sensor in the detection chamber transmits the pressure P0 at this time to the control unit, the control unit pre-stores the voltage signal output by the piezoelectric sensor at different pressures at U0, and the extension L of the telescopic arm at the pressure P0 is retrieved, because the detection cylinder and the telescopic arm are both fixed shapes, the radius value R0 of the circle segment at this location of the multi-oil blade inner hole can be calculated;

[0024] S3, measure the radius of the inner hole, rotate the motor to drive the detection cylinder and telescopic arm to rotate along the inner hole of the multi-oil blade for one circle, the quality of the gas in the detection chamber is constant, and the pressure sensor in the detection chamber monitors the pressure P in the detection chamber in real time n , through the pressure P n The change of relative pressure P0 is compared with the extension L0 to obtain the instantaneous extension L n , thus calculating the radius R of the inner hole at different positions of the multi-oil blade n ;

[0025] S4, obtain the inner hole shape line, establish a coordinate system, and according to the radius value R of different positions of the inner hole of the multi-oil blade in step S3 n , and obtain the inner hole shape data.

[0026] Preferably, in step S3, when the pressure in the detection chamber is P0, the volume of the detection chamber is V0, and the pressure in the detection chamber is P n When the volume of the detection chamber is V n , the following formula can be obtained from Boyle's law:

[0027] P0×V0=P n ×V n (1.0)

[0028] The volume of the detection chamber includes a fixed volume part and a variable part that changes with the extension and retraction of the telescopic arm, which is expressed by the following formula:

[0029] V0=A+αL0 (2.1)

[0030] V n =A+αL n (2.2)

[0031] Among them, A is the volume of the fixed volume part in the detection chamber, α is the cross-sectional coefficient of the telescopic arm, and when the shapes of the detection cylinder and the telescopic arm are fixed, A and α are both constant values;

[0032] Substituting formula 2.1 and formula 2.2 into formula 1.0 and deriving, we get the following formula:

[0033] (3.0)

[0034] Since the detection cylinder and telescopic arm are both fixed in shape, the extension L is obtained by formula 3.0 n , the radius R of the inner hole of the multi-oil blade can be calculated n .

[0035] The beneficial effects of the present invention are:

[0036] 1. The present invention adjusts the position of the detection cylinder by extending multiple telescopic arms outward. All telescopic arms are extended outward under the same pressure. When the pressure between all telescopic arms and the inner hole wall of the multi-oil blade is consistent, the extension amount of all telescopic arms is equal. At this time, the detection cylinder and the multi-oil blade are in a coaxial state, and there is no need to re-center and position each time the detection is performed, thereby simplifying the detection steps.

[0037] 2. The present invention uses pressure sensors, piezoelectric sensors, etc. to automatically center the practice detection cylinder, and calculates the extension amount of the telescopic arm at different positions based on the signals detected by the pressure sensors and piezoelectric sensors, thereby obtaining the inner hole shape of the multi-oil blade. It has a simple structure and low production cost, which increases its applicability.

[0038] 3. The present invention also locks the detection cylinder when it moves to the axial position of the multi-oil blade through the positioning component, so as to avoid changes in the position state of the detection cylinder when it rotates, which affects the measurement result. The positioning component and the telescopic arm are positioned using the same air source. After the air source completes the centering positioning of the detection cylinder, the output end of the air source automatically switches from the detection cylinder to the positioning disk, thereby simplifying the structure while ensuring the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of the detection system of the present invention.

[0040] Figure 2 This is a structural cross-sectional view of the detection system of the present invention in use.

[0041] Figure 3 For the present invention Figure 2 Cross-sectional view at AA in the middle.

[0042] Figure 4 For the present invention Figure 2 Enlarged view of point B in the middle.

[0043] Figure 5 For the present invention Figure 2 Enlarged view of point C in the middle.

[0044] Figure 6 It is a schematic diagram of the assembly of the detection cylinder, telescopic arm and rotating motor of the present invention.

[0045] Figure 7This is one of the structural cross-sectional views of the detection cylinder of the present invention.

[0046] Figure 8 This is the second structural sectional view of the detection cylinder of the present invention.

[0047] Fig. 9 It is a structural cross-sectional view of the telescopic arm of the present invention.

[0048] Fig.10 It is a structural cross-sectional view of the placement tube of the present invention.

[0049] Fig.11 It is a schematic diagram of the structure of the positioning component and the connecting component of the present invention.

[0050] Fig.12 It is a structural cross-sectional view of the positioning component and the connecting component of the present invention.

[0051] The accompanying drawings are marked as follows:

[0052] 1-placing cylinder; 2-detection cylinder; 3-telescopic arm; 4-rotating motor; 5-pressurizing chamber; 6-detection chamber; 7-transverse partition; 8-longitudinal partition; 9-positioning plate; 10-lower bottom plate; 11-upper ring plate; 12-piston ring; 13-upper connecting seat; 14-lower connecting seat; 15-connecting block; 16-connecting ball; 17-thrust rod; 18-placing plate; 19-guide sleeve; 301-arm body; 302-detection head; 303-piezoelectric sensor; 304-piston plate. DETAILED DESCRIPTION

[0053] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0055] Embodiment 1

[0056] At present, three-coordinate measuring machines are mostly used to detect the inner hole shape lines of multi-oil blades. However, when using three-coordinate measuring machines for detection, measurement path planning is time-consuming. Since the probe needs to make mechanical movements during the measurement process, a lot of time is needed to plan the measurement path. When the three-coordinate measuring machine measures different multi-oil blades, the probe needs to be recalibrated for positioning due to the repositioning of the multi-oil blades. The operation is relatively cumbersome and complicated, and requires specialized technicians to operate. Compared with other measuring instruments, the price and maintenance cost of the three-coordinate measuring machine are relatively high, so its general applicability is poor. This embodiment is specially invented to solve the above problems.

[0057] Reference Figure 1-Figure 6 A multi-oil blade inner hole shape line detection system includes a placement tube 1, and the multi-oil blade is placed on the outside of the placement tube 1. It also includes a detection cylinder 2, a telescopic arm 3, a rotating motor 4 and a control unit. The detection cylinder 2 is a vertically arranged cylindrical shell, and the detection cylinder 2 is arranged in the upper part of the placement tube 1 for transverse translation. The telescopic arm 3 translates radially along the detection cylinder 2. The number of telescopic arms 3 is equal to the number of oil blades of the multi-oil blade. The rotating motor 4 drives the detection cylinder 2 to rotate.

[0058] The detection cylinder 2 includes a pressurizing chamber 5 and four detection chambers 6. The number of detection chambers 6 is equal to the number of telescopic arms 3 and is arranged one-to-one. The volumes of all detection chambers 6 are equal. The pressurizing chamber 5 is connected to each detection chamber 6 separately. Both the pressurizing chamber 5 and the detection chamber 6 are provided with pressure sensors. The pressure sensors output the pressure signals in the pressurizing chamber 5 or the detection chamber 6. Solenoid valves are provided at the connection points between the pressurizing chamber 5 and each detection chamber 6.

[0059] The telescopic arm 3 includes an arm body 301, a detection head 302 and a piezoelectric sensor 303. The rear end of the arm body 301 is sealed and slidably arranged in the detection cavity 6. The detection head 302 is arranged at the head end of the arm body 301. The detection head 302 extends outward from the detection cavity 6 and abuts against the inner hole wall of the multi-oil blade. The piezoelectric sensor 303 is fixedly embedded in the head end of the arm body 301. The piezoelectric sensor 303 outputs a voltage signal outward according to the pressure of the detection head 302 abutting against the inner hole wall of the multi-oil blade. The detection head 302 is conical in shape, and a rotating ball is embedded at the end of the detection head 302. The rear end of the detection head 302 is axially slidably fitted on the head end of the arm body 301 and the middle of the rear end of the detection head 302 abuts against the piezoelectric sensor 303.

[0060] The control unit calculates the diameter value of the inner hole of the multi-oil blade at the telescopic arm 3 according to the pressure signal and the voltage signal, and obtains the shape line of the inner hole of the multi-oil blade at the height position of the telescopic arm 3.

[0061] Reference Figure 7 and Figure 8In this embodiment, a transverse partition 7 is laterally arranged in the middle of the detection cylinder 2, and a longitudinal partition 8 is arranged at the lower part of the detection cylinder 2. The cross section of the longitudinal partition 8 is cross-shaped, and four guide sleeves 19 are arranged along the radial direction of the lower part of the detection cylinder 2. The four guide sleeves 19 and the four straight sections of the longitudinal partition 8 are staggered with each other; the space above the transverse partition 7 in the detection cylinder 2 forms a pressurized chamber 5, and the top of the detection cylinder 2 is connected to the air source.

[0062] Reference Figure 2 and Fig. 9 A piston plate 304 is provided at the rear end of the arm body 301, and the piston plate 304 is sealingly slidably sleeved in the guide sleeve 19. The space at the lower part of the detection cylinder 2 and between two adjacent plates of the longitudinal partition 8 and the space in the guide sleeve 19 and located on the side of the piston plate 304 facing the detection cylinder 2 together form a detection chamber 6.

[0063] In order to facilitate the placement of the multi-oil blade and to detect the shape lines of the multi-oil blade inner holes at different height positions, a placement plate 18 is sleeved on the outside of the placement tube 1, and the placement plate 18 is raised and lowered along the height direction of the placement tube 1.

[0064] The position of the detection cylinder 2 is adjusted by extending multiple telescopic arms 3 outward. All telescopic arms 3 are extended and retracted outward under the same pressure. When the pressure between all telescopic arms 3 and the inner hole wall of the multi-oil blade is consistent, the extension amount of all telescopic arms 3 is equal. At this time, the detection cylinder 2 and the multi-oil blade are in a coaxial state, and there is no need to re-center and position each time detection is performed, thereby simplifying the detection steps.

[0065] Embodiment 2

[0066] During use, it was found that when the detection cylinder 2 rotates to detect the shape line of the inner hole of the multi-oil blade, when the radius of the position of the two relative telescopic arms 3 changes, especially when the head end of the telescopic arm 3 rotates to the oil blade section of the inner hole, the telescopic arm 3 extends and retracts, and the detection cylinder 2 is prone to change its position state due to the extension and retraction of the telescopic arm 3. At this time, the detection cylinder 2 and the multi-oil blade are in an eccentric state. Deviations will occur when using the measurement results at this time to calculate the shape line. In order to avoid changes in the position state of the detection cylinder 2 during measurement, this embodiment is specially invented.

[0067] Reference Figure 4 , Fig.10 , Fig.11 and Fig.12 The present invention also includes a positioning component, which includes a positioning disk 9 and a lower base plate 10. The lower base plate 10 is in a circular flat plate shape and is laterally fixedly arranged in the middle of the placement cylinder 1. The positioning disk 9 is slidably arranged on the upper surface of the lower base plate 10. The rotating motor 4 is coaxially installed above the positioning disk 9. The output shaft of the rotating motor 4 is embedded in the bottom of the detection cylinder 2 and is coaxially arranged with the detection cylinder 2. A plurality of bull's eye balls in the same height state are fixed on the lower surface of the positioning disk 9 to facilitate the sliding of the positioning disk 9 on the lower base plate 10.

[0068] The positioning assembly also includes an upper ring plate 11 and a piston ring 12. The upper ring plate 11 is in the shape of an annular flat plate. The upper ring plate 11 is fixedly arranged horizontally in the placing tube 1 and is located above the positioning disk 9. An annular guide cavity is coaxially arranged in the positioning disk 9. The piston ring 12 is longitudinally sealed and slidably arranged in the guide cavity. The upper part of the piston ring 12 extends upward from the positioning disk 9 and abuts against the upper ring plate 11. An air intake pipe is installed at the center of the lower surface of the positioning disk 9. The upper end of the air intake pipe is connected to the bottom of the guide cavity, and the lower end extends downward from the lower base plate 10. The air source is provided with a three-way pipe. The three ends of the three-way pipe are respectively connected to the pressurized chamber 5, the air intake pipe and the air outlet end of the air source. Solenoid valves are provided at the connecting points of the pressurized chamber 5 and the air intake pipe and the three-way pipe.

[0069] After the detection cylinder 2 is centered and positioned, the solenoid valves at the connection between the pressurizing chamber 5, the detection chamber 6 and the three-way pipe are closed, and the solenoid valve at the connection between the intake pipe and the three-way pipe is opened. The gas enters the guide chamber through the intake pipe, driving the piston ring 12 to move upward and against the upper ring plate 11, thereby generating downward pressure on the positioning plate 9 to prevent the detection cylinder 2 from changing its position when the telescopic arm 3 is extended or retracted.

[0070] Embodiment 3

[0071] During use, it was also found that the multi-oil blade shoe would tilt when placed. At this time, the inner hole of the multi-oil blade shoe was also tilted. When the detection cylinder 2 was in a vertical state, the axis of the detection cylinder 2 could not coincide with the axis of the inner hole of the multi-oil blade shoe, which would affect the detection result. In order to ensure that the axis of the detection cylinder 2 coincides with the axis of the inner hole of the multi-oil blade shoe, this embodiment is specially invented.

[0072] Reference Figure 5 , Fig.11 and Fig.12 The present invention further includes a connecting assembly, which includes an upper connecting seat 13 and a lower connecting seat 14, and the upper connecting seat 13 and the lower connecting seat 14 are hinged to each other;

[0073] The rotating motor 4 is fixedly arranged on the upper part of the upper connecting seat 13. An integrally formed connecting block 15 is arranged at the center of the lower side of the upper connecting seat 13. A spherical segment-shaped connecting groove is arranged at the center of the connecting block 15.

[0074] The upper connecting seat 13 is located at the center of the upper side of the positioning plate 9. An upwardly protruding connecting ball 16 is provided at the center of the upper connecting seat 13. The connecting ball 16 is rotatably engaged in the connecting groove.

[0075] The rotating motor 4 and the detection cylinder 2 can both be universally rotated relative to the positioning plate 9, so that the axis center of the detection cylinder 2 coincides with the axis center of the inner hole of the multi-oil blade.

[0076] In order to maintain the current position after the axis of the detection cylinder 2 coincides with the axis of the inner hole of the multi-oil blade: a section of the connecting ball 16 located in the connecting groove is provided with a plurality of push rods 17, the push rods 17 are sealingly slidably arranged in the connecting ball 16, the head end of the push rod 17 extends outward from the connecting ball 16 and abuts against the connecting groove, and the bottom of the internal space of the connecting ball 16 is connected to the bottom of the guide cavity of the positioning plate 9.

[0077] When the detection cylinder 2 is centered and positioned, the detection cylinder 2 together with the rotating motor 4 can rotate relative to the positioning plate 9 through the hinge of the connecting block 15 and the connecting ball 16, so that the detection cylinder 2 can be in a coaxial state with the tilted multi-oil blade; after the detection cylinder 2 is centered and positioned, the gas enters the connecting ball 16 through the air inlet pipe, drives the push rod 17 to move outward and reach the connecting block 15, ensuring that the detection cylinder 2 is in the current position after rotation.

[0078] Embodiment 4

[0079] A method for detecting the inner hole shape of a multi-oil blade comprises the following steps:

[0080] S1, centering and positioning, placing the multi-oil blade, pointing the end of the telescopic arm 3 toward the circular section of the inner hole of the multi-oil blade, starting the air source, ventilating and pressurizing the pressurizing chamber 5, at which time the pressurizing chamber 5 and the detection chamber 6 are in a connected state, the pressure of the detection chamber 6 and all the detection chambers 6 are consistent and increase at the same time, as the pressure in the detection chamber 6 increases, the telescopic arm 3 extends outward and reaches the multi-oil blade, because the pressure in all the detection chambers 6 is the same, the extension amount of all the telescopic arms 3 will tend to be consistent, driving the detection cylinder 2 to translate in the placement tube 1, when the voltage signals output by the piezoelectric sensors 303 of all the telescopic arms 3 are equal, the axis of the detection cylinder 2 coincides with the axis of the multi-oil blade;

[0081] S2, measure the radius of the inner hole circle segment, the air source continues to ventilate and pressurize the pressurized chamber 5 until the control unit monitors that the voltage signal output by the piezoelectric sensor 303 reaches the set value U0, closes the solenoid valve between the pressurized chamber 5 and the detection chamber 6 and turns off the air source, the pressure sensor in the detection chamber 6 transmits the pressure P0 at this time to the control unit, the control unit pre-stores the extension L of the telescopic arm 3 under different pressures at U0 of the voltage signal output by the piezoelectric sensor 303, retrieves the extension L0 at the pressure P0, because the detection cylinder 2 and the telescopic arm 3 are both fixed shapes, the radius R0 of the circle segment at this location of the multi-oil blade inner hole can be calculated;

[0082] S3, measure the radius of the inner hole, rotate the motor 4 to drive the detection cylinder 2 and the telescopic arm 3 to rotate along the inner hole of the multi-oil blade for one circle, the mass of the gas in the detection chamber 6 is constant, and the pressure sensor in the detection chamber 6 monitors the pressure P in the detection chamber 6 in real time n , through the pressure P n The change of relative pressure P0 is compared with the extension L0 to obtain the instantaneous extension L n, thus calculating the radius R of the inner hole at different positions of the multi-oil blade n ;

[0083] S4, obtain the inner hole shape line, establish a coordinate system, and according to the radius value R of different positions of the inner hole of the multi-oil blade in step S3 n , and obtain the inner hole shape data.

[0084] In step S3, when the pressure in the detection chamber 6 is P0, the volume of the detection chamber 6 is V0, and the pressure in the detection chamber 6 is P n When the volume of the detection chamber 6 is V n , the following formula can be obtained from Boyle's law:

[0085] P0×V0=P n ×V n (1.0)

[0086] The volume of the detection chamber 6 includes a fixed volume portion and a variable portion that changes with the extension and contraction of the telescopic arm 3, which is expressed by the following formula:

[0087] V0=A+αL0 (2.1)

[0088] V n =A+αL n (2.2)

[0089] Wherein, A is the volume of the fixed volume part in the detection chamber 6, α is the cross-sectional coefficient of the telescopic arm 3, and when the shapes of the detection cylinder 2 and the telescopic arm 3 are fixed, A and α are both constant values;

[0090] Substituting formula 2.1 and formula 2.2 into formula 1.0 and deriving, we get the following formula:

[0091] (3.0)

[0092] Since the detection cylinder 2 and the telescopic arm 3 are both fixed in shape, the extension L is obtained by formula 3.0: n , the radius R of the inner hole of the multi-oil blade can be calculated n .

[0093] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-oil blade inner hole shape line detection system, comprising a placement tube, and the multi-oil blade is sleeved and placed outside the placement tube, characterized in that: It also includes a detection cylinder, a telescopic arm, a rotating motor and a control unit. The detection cylinder is a vertically arranged cylindrical shell. The detection cylinder is arranged in the upper part of the placement cylinder for transverse translation. The telescopic arm translates radially along the detection cylinder. The number of telescopic arms is equal to the number of oil blades of the multi-oil blade. The rotating motor drives the detection cylinder to rotate. The detection cylinder includes a pressurizing chamber and a plurality of detection chambers. The number of the detection chambers is equal to the number of the telescopic arms and is arranged one by one. The volumes of all the detection chambers are equal. The pressurizing chamber is connected to each detection chamber separately. Both the pressurizing chamber and the detection chamber are provided with a pressure sensor. The pressure sensor outputs the pressure signal in the pressurizing chamber or the detection chamber to the outside. A solenoid valve is provided at the connection between the pressurizing chamber and each detection chamber. The telescopic arm comprises an arm body, a detection head and a piezoelectric sensor. The rear end of the arm body is sealed and slidably disposed in the detection cavity. The detection head is disposed at the head end of the arm body. The detection head extends outward from the detection cavity and abuts against the inner hole wall of the multi-oil blade. The piezoelectric sensor is disposed between the detection head and the arm body. The piezoelectric sensor outputs a voltage signal according to the pressure of the detection head abutting against the inner hole wall of the multi-oil blade. The control unit calculates the diameter value of the inner hole of the multi-oil blade at the telescopic arm according to the pressure signal and the voltage signal, and obtains the shape line of the inner hole of the multi-oil blade at the height position of the telescopic arm; A transverse partition is disposed transversely in the middle of the detection cylinder, a longitudinal partition is disposed at the lower part of the detection cylinder, the cross section of the longitudinal partition is cross-shaped, four guide sleeves are disposed radially at the lower part of the detection cylinder, and the four guide sleeves and the four straight line segments of the longitudinal partition are arranged in an interlaced manner; The space above the transverse partition in the detection cylinder forms a pressurized chamber, and the top of the detection cylinder is connected to the air source.

2. A multi-oil blade inner hole shape detection system according to claim 1, characterized in that: A piston plate is provided at the tail end of the arm body, and the piston plate is sealingly slidably sleeved in the guide sleeve. The sum of the space between two adjacent straight sections of the longitudinal partition at the lower part of the detection cylinder and the space in the guide sleeve on the side of the piston plate facing the detection cylinder forms a detection cavity.

3. A multi-oil blade inner hole shape detection system according to claim 1, characterized in that: It also includes a positioning component, which includes a positioning plate and a lower base plate. The lower base plate is in the shape of a circular flat plate and is laterally fixed in the middle of the placement cylinder. The positioning plate is slidably arranged on the upper surface of the lower base plate. The rotating motor is coaxially installed above the positioning plate. The output shaft of the rotating motor is embedded in the bottom of the detection cylinder and is coaxially arranged with the detection cylinder.

4. A multi-oil blade inner hole shape detection system according to claim 3, characterized in that: The positioning assembly also includes an upper ring plate and a piston ring. The upper ring plate is in the shape of an annular flat plate. The upper ring plate is transversely fixed in the placement tube and is located above the positioning plate. An annular guide cavity is coaxially arranged in the positioning plate. The piston ring is longitudinally sealed and slidably arranged in the guide cavity. The upper part of the piston ring extends upward from the positioning plate and abuts against the upper ring plate. The bottom of the guide cavity is connected to the air source.

5. A multi-oil blade inner hole shape detection system according to claim 4, characterized in that: It also includes a connecting assembly, the connecting assembly includes an upper connecting seat and a lower connecting seat, and the upper connecting seat and the lower connecting seat are hinged to each other; The rotating motor is fixedly arranged on the upper part of the upper connecting seat, an integrally formed connecting block is arranged at the center of the lower side of the upper connecting seat, and a spherical segment-shaped connecting groove is arranged at the center of the connecting block; The upper connecting seat is located at the center of the upper side of the positioning plate. An upwardly protruding connecting ball is arranged at the center of the upper connecting seat. The connecting ball is rotatably embedded in the connecting groove.

6. A multi-oil blade inner hole shape detection system according to claim 5, characterized in that: A section of the connecting ball located in the connecting groove is provided with a plurality of push rods, the push rods are sealingly and slidably arranged in the connecting ball, the heads of the push rods extend outward from the connecting ball and abut against the connecting groove, and the bottom of the internal space of the connecting ball is connected to the bottom of the guide cavity of the positioning plate.

7. The multi-oil blade inner hole shape detection system according to claim 1, characterized in that: A placing plate is sleeved on the outer side of the placing tube, and the placing plate is lifted and lowered along the height direction of the placing tube.

8. A method for detecting the inner hole shape of multiple oil blades, according to a system for detecting the inner hole shape of multiple oil blades according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Centering and positioning, placing the multi-oil blade. Direct the end of the telescopic arm toward the circular section of the inner hole of the multi-oil blade, start the air source, and ventilate and pressurize the pressurized chamber. At this time, the pressurized chamber and the detection chamber are in a connected state, and the pressure of the detection chamber and all the detection chambers are consistent and increase at the same time. As the pressure in the detection chamber increases, the telescopic arm extends outward and reaches the multi-oil blade. Since the pressure in all the detection chambers is the same, the extension amount of all telescopic arms will tend to be consistent, driving the detection cylinder to translate in the placement cylinder. When the voltage signals output by the piezoelectric sensors of all telescopic arms are equal, the axis of the detection cylinder coincides with the axis of the multi-oil blade. S2, measure the radius of the inner hole circle segment, the air source continues to ventilate and pressurize the pressurized chamber until the control unit monitors that the voltage signal output by the piezoelectric sensor reaches the set value U0, closes the solenoid valve between the pressurized chamber and the detection chamber and turns off the air source, the pressure sensor in the detection chamber transmits the pressure P0 at this time to the control unit, the control unit pre-stores the voltage signal output by the piezoelectric sensor at different pressures at U0, and the extension L of the telescopic arm at the pressure P0 is retrieved, because the detection cylinder and the telescopic arm are both fixed shapes, the radius value R0 of the circle segment at this location of the multi-oil blade inner hole can be calculated; S3, measure the radius of the inner hole, rotate the motor to drive the detection cylinder and telescopic arm to rotate along the inner hole of the multi-oil blade for one circle, the quality of the gas in the detection chamber is constant, and the pressure sensor in the detection chamber monitors the pressure P in the detection chamber in real time n , through the pressure P n The change of relative pressure P0 is compared with the extension L0 to obtain the instantaneous extension L n , thus calculating the radius R of the inner hole at different positions of the multi-oil blade n ; S4, obtain the inner hole shape line, establish a coordinate system, and according to the radius value R of different positions of the inner hole of the multi-oil blade in step S3 n , and obtain the inner hole shape data.

9. A method for detecting the inner hole shape of a multi-oil blade according to claim 8, characterized in that: In step S3, when the pressure in the detection chamber is P0, the volume of the detection chamber is V0, and the pressure in the detection chamber is P n When the volume of the detection chamber is V n , the following formula can be obtained from Boyle's law: P0×V0=P n ×V n (1.0) The volume of the detection chamber includes a fixed volume part and a variable part that changes with the extension and retraction of the telescopic arm, which is expressed by the following formula: V0=A+αL0 (2.1) V n =A+αL n (2.2) Among them, A is the volume of the fixed volume part in the detection chamber, α is the cross-sectional coefficient of the telescopic arm, and when the shapes of the detection cylinder and the telescopic arm are fixed, A and α are both constant values; Substituting formula 2.1 and formula 2.2 into formula 1.0 and deriving, we get the following formula: （3.0） Since the detection cylinder and telescopic arm are both fixed in shape, the extension L is obtained by formula 3.0 n , the radius R of the inner hole of the multi-oil blade can be calculated n .

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