Foil pneumatic flatness detection device with built-in measurement module and measurement method

Abstract

The present invention relates to the field of plate shape detection, and provides a pneumatic plate shape detection device and a measurement method for foil with an embedded measurement module. The pneumatic plate shape detection device includes a hollow mandrel, a roller ring and an embedded measurement module. The roller ring is located outside the hollow mandrel, the embedded measurement module is located inside the hollow mandrel, the axial pneumatic control module is located on both sides of the hollow mandrel, the hollow mandrel is fixed on a supporting positioning module, the differential pressure transmitter is evenly distributed along the inside of the hollow mandrel, the number of measurement areas on the differential pressure transmitter and the hollow mandrel corresponds, and the differential pressure monitoring nozzles are symmetrically distributed at the upper and lower ends of the differential pressure transmitter. The measurement method is to obtain the plate shape of the foil through data post-processing according to the standard voltage signal corresponding to the pressure difference obtained by the differential pressure monitoring nozzles on both sides of the differential pressure transmitter. The present invention can solve the problems of long gas transmission process, large occupied space and low detection accuracy, and solve the problem of lagging plate shape control by real-time monitoring of the pressure difference.

Description

Technical Field

[0001] The invention relates to the field of plate shape detection, and in particular to a foil material pneumatic plate shape detection device with an embedded measurement module and a measurement method. Background Art

[0002] Shapemeter is a key equipment in metal strip rolling production. Its measurement accuracy of strip shape and other parameters determines the control accuracy of the entire rolling production line and is the key to ensuring strip quality. At present, shapemeters can be divided into two categories: contact shapemeters and non-contact shapemeters according to the contact method with the strip.

[0003] The shape signal of non-contact shape meter is not direct signal, signal processing is easy to be distorted, signal processing technology is high, difficult, software writing and debugging costs are high, so it is not suitable for foil shape detection. Contact shape meter has the advantages of direct signal detection, easy signal processing and high detection accuracy. There are mainly four types: ABB piezomagnetic shape meter, BFI piezoelectric shape meter, whole roll inlaid shape meter and pneumatic shape meter. Among them, the first three shape meters have a large range and are suitable for shape detection of strips with a thickness of more than 0.1mm. They are not sensitive and are also not suitable for foil shape detection.

[0004] The pneumatic flatness meter uses air pressure micrometer technology and is mainly used for flatness detection of precision metal rolled foil with small contact tension. The obvious characteristics of the equipment are: the friction between the precision foil and the floating roller ring is very small, and the foil will not be scratched during operation; multiple floating roller rings that contact the foil are used to detect the flatness using the principle of air pressure difference sensing transformation. However, due to the external differential pressure transmitter, the current pneumatic flatness meter has a long gas flow and changes in pressure during transmission, which makes it impossible to accurately detect the flatness of the precision foil and cannot meet the requirements of the flatness control of the precision foil. Patent CN2544853Y discloses a pneumatic flatness meter structure, which uses an air pipe to connect the differential pressure monitoring nozzle to transport the gas to the differential pressure transmitter in the rear electric control room to detect the flatness. However, the gas flow is long and occupies space, and it is impossible to detect the flatness in real time, which not only reduces the detection accuracy but also affects the timely control of the flatness.

[0005] Therefore, the present invention proposes a pneumatic flatness detection device and a measurement method for strips with an embedded measurement module to solve the technical problems of low integration, long gas flow, slow response speed and low detection accuracy of the above-mentioned device. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a pneumatic flatness detection device and a measuring method for foil with an embedded measuring module. The differential pressure monitoring nozzles symmetrically distributed on both sides of the differential pressure transmitter are installed inside the hollow core shaft, and the gear shaft drives the gear to mesh with the gear end on the movable joint, so that the movable joint connected to the differential pressure transmitter moves inside the differential pressure monitoring nozzle, and the pressure of the gas between the hollow core shaft and the roller ring is measured in real time, thereby reducing the occupied space of the embedded measuring module and reducing the process of gas transmission. The exhaust nozzles with deflection angles uniformly distributed circumferentially on the hollow core shaft can quickly fill the gas entering from the air inlet end cover into the hollow core shaft and the roller ring, thereby reducing the friction between the precision foil and the floating roller ring. The number of differential pressure transmitters and measuring areas on the hollow core shaft corresponds one to one, and the pressure value between the hollow core shaft and the roller ring is monitored in real time, thereby improving the detection accuracy and providing timely feedback, and finally solving the problem of plate shape control lag.

[0007] The present invention provides a pneumatic foil shape detection device with an embedded measurement module, which comprises a hollow mandrel, a support positioning module, an axial pneumatic control module, a roller ring and an embedded measurement module, wherein the roller ring is located outside the hollow mandrel, the embedded measurement module is located inside the hollow mandrel, the axial pneumatic control module is located on both sides of the hollow mandrel, and the hollow mandrel is fixed on the support positioning module.

[0008] The axial direction of the hollow core shaft is a stepped structure, and M groups of measuring areas are evenly arranged in the axial direction of the hollow core shaft, where M is a positive integer, and two differential pressure monitoring nozzles and N exhaust nozzles are arranged in each group of measuring areas, where N is a positive integer greater than or equal to 4, and the differential pressure monitoring nozzles and the exhaust nozzles are symmetrically and evenly distributed along the circumference of the hollow core shaft, and the central hole of the exhaust nozzle has a deflection angle, and the angle of the deflection angle is 0-10°;

[0009] The embedded measuring module includes a rear support ring, a movable joint, a gear, a sleeve, a front support ring, a gear shaft, a differential pressure transmitter and an outer frame. The movable joint, the gear and the sleeve are symmetrically distributed at the upper end and the lower end of the differential pressure transmitter. The differential pressure transmitter is distributed along the axial direction of the outer frame. The bottom fixed end of the differential pressure transmitter is connected to the positioning block on the outer frame. The guard plate is located on the side of the differential pressure transmitter, and the guard plate is connected to the first fixed end on both sides of the outer frame. The inside of the movable joint is connected to the input end of the differential pressure transmitter through a sealing ring, and the outside of the movable joint is connected to the differential pressure transmitter through a sealing ring. The sealing ring is connected to the inside of the pressure difference monitoring nozzle, the gear end of the movable joint is meshed with the gear, the fixed end of the gear is connected to the gear shaft, the sleeve is located between two adjacent gears, the rear support ring is connected to the second fixed end of the outer frame through a fixing pin, the front support ring is connected to the third fixed end of the outer frame through a spring, and a mounting hole for installing a top screw is provided in the middle of the front support ring. The first side end of the outer frame is connected to the fixed end of the air intake end cover of the axial pneumatic control module, and the second side end of the outer frame is connected to the fixed end of the plug end cover of the axial pneumatic control module.

[0010] Preferably, the exhaust port size of the exhaust nozzle is 0.1-1 mm, and the air inlet size of the pressure difference monitoring nozzle is 0.5-5 mm.

[0011] Preferably, the supporting positioning module includes a base, a roller seat and a locking nut, the base is located at the bottom of the hollow core shaft, and the fixed ends on both sides of the hollow core shaft pass through the locking nut and are connected to the fixed ends of the base through the roller seat.

[0012] Preferably, the axial pneumatic control module includes a pressure cover, an axial thrust air ring, an air inlet end cover, a plug and a plug end cover, the circumferential array of the axial thrust air ring has multiple air outlets, the first end of the plug end cover is connected to the inner mounting end of the hollow core shaft, the air inlet end of the air inlet end cover is connected to the air inlet end of the hollow core shaft, the first mounting end of the axial thrust air ring is connected to the outer first mounting end of the hollow core shaft, the first mounting end of the pressure cover is connected to the outer second mounting end of the hollow core shaft, the second mounting end of the axial thrust air ring is connected to the second mounting end of the pressure cover, the second end of the plug end cover is connected to the fixed end of the plug, and the connecting end of the plug is connected to the line end of the differential pressure transmitter.

[0013] Preferably, the distance between the inside of the roller ring and the outside of the hollow core shaft is 5~100μm, the roller rings are evenly distributed along the axial direction of the hollow core shaft, the gap between two adjacent roller rings is 10~100μm, and the number of roller rings, the number of differential pressure transmitters and the number of measuring areas correspond.

[0014] Preferably, the number of the gland and the number of the axial thrust ring are both two, and the gland and the axial thrust ring are symmetrically distributed on both sides of the hollow core shaft.

[0015] Preferably, the spring, the front support ring, the gear shaft and the rear support ring are symmetrically mounted on the upper and lower ends of both sides of the outer frame, and a wire collecting groove is provided on the inner side of the guard plate.

[0016] A second aspect of the present invention provides a method for measuring a foil pneumatic flatness detection device with a built-in measurement module. The method is based on the above-mentioned foil pneumatic flatness detection device with a built-in measurement module, and the method comprises the following steps:

[0017] S1. Let the compressed air enter the hollow mandrel through the air inlet cover, and then enter the annular detection gap formed by the hollow mandrel and the roller ring through the exhaust nozzle located in the circumferential direction of the measuring area on the hollow mandrel to float the roller ring:

[0018] S2. When the foil passes through the first end of the roller ring, under the action of the foil tension, the The annular detection gap at the first end of the roller ring contacting the foil in the group measurement area is reduced, resulting in an increase in the pressure of the differential pressure monitoring nozzle at the first end, while the annular detection gap at the second end of the roller ring not contacting the foil is increased, resulting in a decrease in the pressure of the differential pressure monitoring nozzle at the second end, thereby obtaining the pressure of the second end of the roller ring on the hollow core shaft. Detection gap pressure difference within the group measurement area , =1,2…, M, where M is the number of measuring areas on the hollow mandrel and M is a positive integer:

[0019] S3, according to the detection gap pressure difference obtained in step S2 The corresponding standard voltage signal is used to obtain the shape of the foil through data post-processing , the specific calculation process is:

[0020] S31, detecting the gap pressure difference obtained in step S2 , the first The radial pressure on the roller ring corresponding to the group measurement area and the corresponding Residual stress of foil in the measuring area ;

[0021] S32: radial pressure obtained according to step S31 , and get the corresponding Foil tensile stress in the measuring area , the specific expression is:

[0022] ;

[0023] in, For the The radial pressure on the roller ring corresponding to the group measurement area; For the corresponding The foil tensile stress in the group measurement area; For the corresponding Foil thickness in the group measurement area; For the corresponding Roller ring width of the group measuring area; The foil wraps around half of the roll ring wrap angle;

[0024] S33. Based on step S32, obtain the coverage Foil tension in the group measuring area With coverage Foil tensile stress in the measuring area The relationship is:

[0025] ;

[0026] in, For the corresponding Foil tension in the group measuring area; For the corresponding The foil tensile stress in the group measurement area; For the corresponding Foil thickness in the group measurement area; For the corresponding Foil width of the group measurement area;

[0027] S34: Foil tensile stress obtained according to step S32 , and get the corresponding Foil tension in the group measuring area and the total tension of the foil in the entire measuring area , the specific expression is:

[0028] ;

[0029] S35: The total tension of the foil in all the measuring areas obtained in step S34 , and get the corresponding Average tensile stress of foil in the group measurement area , the specific expression is:

[0030] ;

[0031] in, is the total tension of the foil in the entire measuring area; is the foil width of the entire measuring area; is the foil thickness of the entire measurement area;

[0032] S36: Foil tensile stress obtained according to step S32 and the average tensile stress of the foil obtained in step S35 , and get the corresponding Residual stress of foil in the measuring area , the specific expression is:

[0033] ;

[0034] S37, based on steps S31 to S36, obtain the plate shape according to the elastic modulus of the foil and the Poisson's ratio of the foil , the specific expression is:

[0035] ;

[0036] in, It is in plate shape; is the length difference between other points of the foil and the reference point; is the reference point length; is the maximum residual stress of the foil; is the minimum residual stress of the foil; is the elastic modulus of the foil; is the Poisson's ratio of the foil.

[0037] Preferably, in step S2, the annular detection gap at the first end and the annular detection gap at the second end are spaced apart at an angle of 180°.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] 1. The pneumatic flatness detection device for foil with an embedded measuring module of the present invention embeds the measuring module into the interior of the pneumatic flatness device, significantly improving the integration of the system. This design reduces the demand for air pipes and cables inside and outside the hollow core shaft, making the device structure more compact and the appearance more concise. The absence of air pipes, cables and interfaces not only reduces the failure rate caused by wiring problems, but also makes the equipment easier to maintain. The differential pressure transmitter in the embedded pneumatic flatness detection device is tightly integrated with the main body of the device, which enhances the coordination between components, shortens the signal transmission path, and speeds up the response speed. In addition, the simplified structure also means lower maintenance procedures and higher reliability, resulting in sustained and stable performance.

[0040] 2. Data real-time performance of the present invention is better than that of the traditional pneumatic flatness meter. The close connection between the embedded differential pressure transmitter and the device body helps to improve the real-time performance of data collection. The distance for data to be transmitted from the differential pressure transmitter to the processing unit is shorter, which means that the signal transmission time is shorter, the data update speed is faster, and a quick response can be achieved.

[0041] 3. Compared with the traditional pneumatic flatness meter, the measurement accuracy of the present invention is better. Since the temperature inside the hollow mandrel is not easily affected by the outside world, the embedded differential pressure transmitter can reduce the impact of external temperature changes on the measurement results, but it will cause measurement errors in the external differential pressure transmitter. The embedded design can not only be directly installed at the key position of the pneumatic flatness meter, but its integrated design with the main body of the device can also better control the environmental conditions around the differential pressure transmitter.

[0042] 4. Compared with the traditional pneumatic flatness meter, the anti-interference ability of the present invention is better than that of the traditional pneumatic flatness meter. The embedded design can better protect the differential pressure transmitter from external electromagnetic interference. Through physical isolation, the sensor can work in a relatively pure environment to ensure the quality of signal transmission. Reducing the signal attenuation problem caused by poor external electrical connection can improve the reliability of data acquisition.

[0043] 5. Durability and protection of the present invention Compared with traditional pneumatic flatness gauges, the embedded differential pressure transmitter design provides better protection to prevent pollutants from the external environment from entering the sensor. This design improves the durability of the equipment, extends its service life, and ensures long-term stable working performance. Higher integration means that the equipment has better sealing, can better resist the adverse effects of humid or dusty environments, and enhances the overall protection of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is an overall diagram of the foil pneumatic flatness detection device with a built-in measurement module of the present invention;

[0045] Figure 2 It is a cross-sectional view of a foil pneumatic flatness detection device with a built-in measurement module according to the present invention;

[0046] Figure 3 It is a right side view of the foil pneumatic flatness detection device with a built-in measurement module of the present invention;

[0047] Figure 4 It is an axial side view of the foil pneumatic flatness detection device with a built-in measurement module of the present invention;

[0048] Figure 5 The invention relates to a foil pneumatic flatness detection device with a built-in measurement module. Figure 4 A partial cross-sectional enlarged view of position B in the middle;

[0049] Figure 6 It is a structural diagram of a movable joint in a foil pneumatic flatness detection device with a built-in measurement module of the present invention;

[0050] Figure 7 It is a top view of the hollow mandrel in the foil pneumatic flatness detection device with a built-in measurement module of the present invention;

[0051] Figure 8 The invention relates to a foil pneumatic flatness detection device with a built-in measurement module. Figure 7 Middle AA section view;

[0052] Fig. 9 The invention relates to a foil pneumatic flatness detection device with a built-in measurement module. Figure 8 A partial enlarged view of point C in the middle;

[0053] Fig.10 It is an embedded diagram of the embedded measuring module in the foil pneumatic flatness detection device with the embedded measuring module of the present invention;

[0054] Fig.11 It is a structural diagram of an embedded measuring module in a foil pneumatic flatness detection device with an embedded measuring module according to the present invention;

[0055] Fig.12 It is an exploded view of the embedded measuring module in the foil pneumatic flatness detection device with the embedded measuring module of the present invention;

[0056] Fig.13 It is a structural diagram of a front support ring of an embedded measuring module in a foil pneumatic flatness detection device with an embedded measuring module according to the present invention;

[0057] Fig.14 The present invention is a flow chart of a measuring method of a foil pneumatic flatness detection device with a built-in measuring module.

[0058] Main reference numerals:

[0059] 1. Plug end cover; 101. Plug 101; 2. Hollow core shaft; 201. Pressure difference monitoring nozzle; 202. Exhaust nozzle; 3. Roller seat; 4. Locking nut; 5. Pressure cover; 6. Axial thrust gas ring; 7. Roller ring; 8. Inlet end cover; 9. Embedded measuring module; 901. Fixing pin; 902. Rear support ring; 903. Sealing ring; 904. Moving joint; 905. Gear; 906. Sleeve; 907. Front support ring; 908. Top screw; 909. Gear shaft; 910. Differential pressure transmitter; 911. Guard plate; 912. Spring; 913. Outer frame; 10. Base. DETAILED DESCRIPTION

[0060] The exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0061] Pneumatic foil flatness detection device with built-in measuring module, such as Figures 1 to 3 As shown, it includes a hollow mandrel 2, a support and positioning module, an axial pneumatic control module, a roller ring 7 and an embedded measurement module 9. The roller ring 7 is located outside the hollow mandrel 2. The finish of the inner surface of the roller ring 7 and the outer surface of the hollow mandrel 2 is ≤Ra0.4, and the total runout is ≤0.02. The embedded measurement module 9 is located inside the hollow mandrel 2. The axial pneumatic control module is located on both sides of the hollow mandrel 2. The hollow mandrel 2 is fixed on the support and positioning module. The pneumatic plate shape detection device directly connects the differential pressure monitoring nozzle 201 set on the hollow mandrel 2 with the differential pressure transmitter 910 set inside the hollow mandrel 2 through a movable joint 904, which significantly shortens the gas flow, speeds up the detection response speed, and significantly improves the detection accuracy.

[0062] Since the roller ring 7 is floated by compressed air, during the working process of the foil dragging the roller ring 7 to rotate, the friction between the roller ring 7 and the hollow core shaft 2 is almost zero. Therefore, the pneumatic flatness detection device will not scratch the foil during normal operation. The device of the present invention continues the high precision feature of the pneumatic detection instrument and is suitable for the detection of precision foil flatness.

[0063] like Figure 7 As shown, the axial direction of the hollow core shaft 2 is a stepped structure, which is conducive to the positioning and installation of parts. The axial direction of the hollow core shaft 2 is evenly provided with M groups of measuring areas, M is a positive integer greater than or equal to 1, and each group of measuring areas is provided with two pressure difference monitoring nozzles 201 and N exhaust nozzles 202, N is a positive integer greater than or equal to 4. The pressure difference monitoring nozzle 201 has a thread on the upper side and a circular groove on the bottom. The pressure difference monitoring nozzle 201 and the exhaust nozzle 202 are symmetrically and evenly distributed along the circumference of the hollow core shaft 2, as shown in FIG. Figure 8 and Fig. 9 As shown, the central hole of the exhaust nozzle 202 has a deflection angle, and the deflection angle is 0~10°, which is beneficial to the self-rotation of the roller ring 7 when the pneumatic flatness detection device is working, reducing the friction between the roller ring 7 and the foil material, thereby ensuring the flatness quality of the foil material; the exhaust port size of the exhaust nozzle 202 is 0.1~1mm, and the air inlet size of the pressure difference monitoring nozzle 201 is 0.5~5mm.

[0064] like Fig.11 and Fig.12 As shown, the embedded measuring module 9 includes a fixing pin 901, a rear support ring 902, a sealing ring 903, a movable joint 904, a gear 905, a sleeve 906, a front support ring 907, a top screw 908, a gear shaft 909, a differential pressure transmitter 910, a guard plate 911, a spring 912 and an outer frame 913. The upper side of the movable joint 904 is processed with a groove for placing the sealing ring 903, the bottom has a circular groove, and the side is processed with evenly distributed teeth. The inner side of the guard plate 911 is opened with a collection groove for collecting and arranging the lines of the differential pressure transmitter 910. The cable collection groove covers the entire differential pressure transmitter 910; the rear support ring 902, the movable joint 904, the gear 905, the sleeve 906, the front support ring 907, the gear shaft 909 and the spring 912 are symmetrically distributed at the upper and lower ends of the differential pressure transmitter 910. The front support ring 907 is limited by the top screw 908. The front support ring 907 contacts the inner wall surface of the hollow core shaft 2, and the rear support ring 902 does not contact the inner wall surface of the hollow core shaft 2. This can not only ensure the stability of the embedded measurement module 9 inside the hollow core shaft 2, but also facilitate installation and maintenance. The pressure difference detected by the pressure difference monitoring nozzle 201 symmetrically distributed at the upper and lower ends of the differential pressure transmitter 910 is related to the tension exerted by the foil on the roller ring 7. Since the roller ring 7 is floated by compressed air, the friction between the roller ring 7 and the hollow core shaft 2 is almost zero during the working process of the foil dragging the roller ring 7 to rotate.

[0065] The differential pressure transmitter 910 is distributed along the axial direction of the outer frame 913. The bottom fixed end of the differential pressure transmitter 910 is connected to the positioning block on the outer frame 913. The guard plate 911 is located on the side of the differential pressure transmitter 910 and is connected to the first fixed ends on both sides of the outer frame 913. Figure 5 and Figure 6 As shown, the interior of the movable joint 904 is connected to the output end of the differential pressure transmitter 910 through the sealing ring 903, the exterior of the movable joint 904 is connected to the interior of the differential pressure monitoring nozzle 201 through the sealing ring 903, the gear end of the movable joint 904 is meshed with the gear 905, the fixed end of the gear 905 is connected to the gear shaft 909, the gear shaft 909 controls all the gears 905 to rotate synchronously, the sleeve 906 is located between two adjacent gears 905, the rear support ring 902 is connected to the second fixed end of the outer frame 913 through the fixing pin 901, and the front support ring 907 is connected to the third fixed end of the outer frame 913 through the spring 912, as shown in FIG. Fig.10 and Fig.13 As shown, a mounting hole for mounting a top screw 908 is provided in the middle of the front support ring 907, a first side end of the outer frame 913 is threadedly connected to a fixed end of the air intake end cover 8, and a second side end of the outer frame 913 is connected to a fixed end of the plug end cover 1.

[0066] like Fig.12 As shown, the front support ring 907 and the rear support ring 902 are symmetrically installed at the upper and lower ends of both sides of the outer frame 913, respectively, the movable joint 904 is symmetrically installed at the upper and lower ends of the differential pressure transmitter 913, and the gear shaft 909 is symmetrically installed at the upper and lower ends of the outer frame 913.

[0067] Support positioning modules, such as Figure 2 As shown, it includes a base 10, a roller seat 3 and a locking nut 4. The base 10 is located at the bottom of the hollow core shaft 2. The fixed ends on both sides of the hollow core shaft 2 pass through the locking nut 4 and are connected to the fixed ends of the base 10 through the roller seat 3.

[0068] like Figure 2 and Figure 4As shown, the axial pneumatic control module includes a pressure cover 5, an axial thrust air ring 6, an air inlet end cover 8, a plug 101 and a plug end cover 1. The circumferential array of the axial thrust air ring 6 has multiple air outlets, which are conducive to the axial fixation of the roller ring 7 array. The first end of the plug end cover 1 is connected to the internal mounting end of the hollow core shaft 2, the air inlet end of the air inlet end cover 8 is connected to the air inlet end of the hollow core shaft 2, the first mounting end of the axial thrust air ring 6 is connected to the first mounting end outside the hollow core shaft 2, the first mounting end of the pressure cover 5 is connected to the second mounting end outside the hollow core shaft 2, the second mounting end of the axial thrust air ring 6 is connected to the second mounting end of the pressure cover 5, the second mounting end of the pressure cover 5 is installed with a sealing ring and is sealed and connected to the second mounting end of the axial thrust air ring 6 to ensure that the air pressure in the axial thrust air ring 6 is sufficient, the second end of the plug end cover 1 is connected to the fixed end of the plug 101, and the connecting end of the plug 101 is connected to the line end of the differential pressure transmitter 910. Specifically, the number of the gland 5 and the number of the axial thrust ring 6 are both two, and the gland 5 and the axial thrust ring 6 are symmetrically distributed on both sides of the hollow core shaft 2 .

[0069] The distance between the inside of the roller ring 7 and the outside of the hollow core shaft 2 is 5~100μm, the roller rings 7 are evenly distributed along the axial direction of the hollow core shaft 2, the gap between two adjacent roller rings 7 is 10~100μm, and the number of roller rings 7, differential pressure transmitters 910 and measuring areas corresponds one to one.

[0070] The following is a further description of a foil pneumatic flatness detection device and a measurement method with a built-in measurement module according to the present invention in conjunction with an embodiment:

[0071] A method for measuring a foil pneumatic flatness detection device having an embedded measuring module, such as Fig.14 As shown, the specific steps include:

[0072] S1. Compressed air is introduced into the hollow core shaft 2 through the air inlet end cover 8, and enters the annular detection gap formed by the hollow core shaft 2 and the roller ring 7 through the circumferential exhaust nozzle 202 located in the measuring area on the hollow core shaft 2, so as to float the roller ring 7. A pressure difference monitoring nozzle 201 is installed on the hollow core shaft 2 corresponding to each section of the roller ring 7.

[0073] S2. In the pneumatic plate shape detection device, the pressure difference monitoring nozzle 201 is connected to the two ends of the differential pressure transmitter 910 on the embedded measuring module 9 fixed in the hollow core shaft 2 through the movable joint 904 to detect the pressure difference formed by the two relative pressure difference monitoring nozzles 201 in the detection gap formed by the roller ring 7 and the hollow core shaft 2 under different foils. The specific process is as follows: the foil is placed on the roller ring 7. At this time, under the action of the tension applied to the foil, the first The annular detection gap at the first end of the roller ring 7 in contact with the foil in the group measurement area is reduced, resulting in an increase in the pressure of the differential pressure monitoring nozzle 201 at the first end of the group, while the annular detection gap at the second end of the roller ring 7 not in contact with the foil is increased, resulting in a decrease in the pressure of the differential pressure monitoring nozzle 201 at the second end of the group, thereby obtaining the pressure of the first end of the hollow core shaft 2. Detection gap pressure difference within the group measurement area , =1, 2, 3...M. Specifically, the annular detection gap at the first end and the annular detection gap at the second end are spaced at an angle of 180°.

[0074] S3, according to the detection gap pressure difference related to the foil obtained in step S2 The corresponding standard voltage signal is sent to the computer through the data acquisition board, and the corresponding developed software performs data processing to give the plate shape signal and plate shape control signal obtained by integrating each segment signal. The specific calculation process is as follows:

[0075] S31, detecting the gap pressure difference obtained in step S2 , the first The radial pressure on the roller ring 7 corresponding to each measuring area and the corresponding Residual stress in foil in each measuring area , =1, 2, 3...M.

[0076] S32: radial pressure obtained according to step S31 , and get the corresponding Foil tensile stress in the measuring area , the specific expression is:

[0077] ;

[0078] in, For the The radial pressure exerted on the roller ring 7 corresponding to the group measuring area; For the corresponding The foil tensile stress in the group measurement area; For the corresponding Foil thickness in the group measurement area; For the corresponding The width of the roller ring 7 in the group measuring area; The foil wraps around half of the angle of roller ring 7.

[0079] S33. Based on step S32, obtain the coverage Foil tension in the group measuring area With coverage Foil tensile stress in the measuring area The relationship is:

[0080] ;

[0081] in, For the corresponding Foil tension in the group measuring area; For the corresponding The foil tensile stress in the group measurement area; For the corresponding Foil thickness in the group measurement area; For the corresponding Foil width in the group measuring area.

[0082] S34: Foil tensile stress obtained according to step S32 , and get the corresponding Foil tension in the group measuring area and the total tension of the foil in the entire measuring area , the specific expression is:

[0083] .

[0084] S35: The total tension of the foil in all the measuring areas obtained in step S34 , and get the corresponding Average tensile stress of foil in the group measurement area , the specific expression is:

[0085] ;

[0086] in, is the total tension of the foil in the entire measuring area; is the foil width of the entire measuring area; is the foil thickness of the entire measuring area.

[0087] S36: Foil tensile stress obtained according to step S32 and the average tensile stress of the foil obtained in step S35 , and get the corresponding Residual stress of foil in the measuring area , the specific expression is:

[0088] .

[0089] S37, based on steps S31 to S36, obtain the plate shape according to the elastic modulus of the foil and the Poisson's ratio of the foil , the specific expression is:

[0090] ;

[0091] in, It is in plate shape; is the length difference between other points of the foil and the reference point; is the reference point length; is the maximum residual stress of the foil; is the minimum residual stress of the foil; is the elastic modulus of the foil; is the Poisson's ratio of the foil; The unit is the international I unit.

[0092] The embodiments described above are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A pneumatic foil shape detection device with an embedded measurement module, comprising a hollow mandrel, a support and positioning module, an axial pneumatic control module, a roller ring and an embedded measurement module, wherein the roller ring is located outside the hollow mandrel, the embedded measurement module is located inside the hollow mandrel, the axial pneumatic control module is located on both sides of the hollow mandrel, and the hollow mandrel is fixed on the support and positioning module, characterized in that: The axial direction of the hollow core shaft is a stepped structure, and M groups of measuring areas are evenly arranged in the axial direction of the hollow core shaft, where M is a positive integer, and two differential pressure monitoring nozzles and N exhaust nozzles are arranged in each group of measuring areas, where N is a positive integer greater than or equal to 4, and the differential pressure monitoring nozzles and the exhaust nozzles are symmetrically and evenly distributed along the circumference of the hollow core shaft, and the central hole of the exhaust nozzle has a deflection angle, and the angle of the deflection angle is 0-10°; The embedded measuring module includes a rear support ring, a movable joint, a gear, a sleeve, a front support ring, a gear shaft, a differential pressure transmitter and an outer frame. The movable joint, the gear and the sleeve are symmetrically distributed at the upper end and the lower end of the differential pressure transmitter. The differential pressure transmitter is distributed along the axial direction of the outer frame. The bottom fixed end of the differential pressure transmitter is connected to the positioning block on the outer frame. The guard plate is located on the side of the differential pressure transmitter, and the guard plate is connected to the first fixed end on both sides of the outer frame. The inside of the movable joint is connected to the input end of the differential pressure transmitter through a sealing ring, and the outside of the movable joint is connected to the differential pressure transmitter through a sealing ring. The sealing ring is connected to the inside of the pressure difference monitoring nozzle, the gear end of the movable joint is meshed with the gear, the fixed end of the gear is connected to the gear shaft, the sleeve is located between two adjacent gears, the rear support ring is connected to the second fixed end of the outer frame through a fixing pin, the front support ring is connected to the third fixed end of the outer frame through a spring, and a mounting hole for installing a top screw is provided in the middle of the front support ring. The first side end of the outer frame is connected to the fixed end of the air intake end cover of the axial pneumatic control module, and the second side end of the outer frame is connected to the fixed end of the plug end cover of the axial pneumatic control module.

2. The foil pneumatic flatness detection device with built-in measurement module according to claim 1, characterized in that: The exhaust port size of the exhaust nozzle is 0.1~1mm, and the air inlet size of the pressure difference monitoring nozzle is 0.5~5mm.

3. The pneumatic foil shape detection device with built-in measurement module according to claim 1, characterized in that: The supporting positioning module comprises a base, a roller seat and a locking nut. The base is located at the bottom of the hollow mandrel. The fixed ends on both sides of the hollow mandrel pass through the locking nut and are connected to the fixed ends of the base through the roller seat.

4. The foil pneumatic flatness detection device with built-in measurement module according to claim 1, characterized in that: An axial pneumatic control module includes a pressure cover, an axial thrust air ring, an air inlet end cover, a plug and a plug end cover. The circumferential array of the axial thrust air ring has multiple air outlets. The first end of the plug end cover is connected to the mounting end inside the hollow core shaft, the air inlet end of the air inlet end cover is connected to the air inlet end of the hollow core shaft, the first mounting end of the axial thrust air ring is connected to the first mounting end outside the hollow core shaft, the first mounting end of the pressure cover is connected to the second mounting end outside the hollow core shaft, the second mounting end of the axial thrust air ring is connected to the second mounting end of the pressure cover, the second end of the plug end cover is connected to the fixed end of the plug, and the connecting end of the plug is connected to the line end of the differential pressure transmitter.

5. The pneumatic foil shape detection device with built-in measurement module according to claim 1, characterized in that: The distance between the inside of the roller ring and the outside of the hollow core shaft is 5~100μm, the roller rings are evenly distributed along the axial direction of the hollow core shaft, the gap between two adjacent roller rings is 10~100μm, and the number of roller rings, the number of differential pressure transmitters and the number of measuring areas correspond.

6. The foil pneumatic flatness detection device with built-in measurement module according to claim 4, characterized in that: The number of the gland and the number of the axial thrust ring are both two, and the gland and the axial thrust ring are symmetrically distributed on both sides of the hollow core shaft.

7. The pneumatic foil shape detection device with built-in measurement module according to claim 1, characterized in that: The spring, the front supporting ring, the gear shaft and the rear supporting ring are symmetrically installed on the upper end and the lower end of both sides of the outer frame respectively, and a wire collecting groove is opened on the inner side of the guard plate.

8. A method for measuring a foil pneumatic flatness detection device with a built-in measurement module, the method being based on the foil pneumatic flatness detection device with a built-in measurement module according to any one of claims 1 to 7, characterized in that: The measuring method comprises the following steps: S1. Compressed air is introduced into the hollow mandrel through the air inlet cover, and enters the annular detection gap formed by the hollow mandrel and the roller ring through the exhaust nozzle located in the circumferential direction of the measuring area on the hollow mandrel, so as to float the roller ring; S2. When the foil passes through the first end of the roller ring, under the action of the foil tension, the The annular detection gap at the first end of the roller ring contacting the foil in the group measurement area is reduced, resulting in an increase in the pressure of the differential pressure monitoring nozzle at the first end, while the annular detection gap at the second end of the roller ring not contacting the foil is increased, resulting in a decrease in the pressure of the differential pressure monitoring nozzle at the second end, thereby obtaining the pressure of the second end of the roller ring on the hollow core shaft. Detection gap pressure difference within the group measurement area , =1,2…, M, M is the number of measuring areas on the hollow mandrel, M is a positive integer; S3, according to the detection gap pressure difference obtained in step S2 The corresponding standard voltage signal is used to obtain the shape of the foil through data post-processing , the specific calculation process is: S31, detecting the gap pressure difference obtained in step S2 , the first The radial pressure on the roller ring corresponding to the group measurement area and the corresponding Residual stress of foil in the measuring area ; S32: radial pressure obtained according to step S31 , and get the corresponding Foil tensile stress in the measuring area , the specific expression is: ； in, For the The radial pressure on the roller ring corresponding to the group measurement area; For the corresponding The foil tensile stress in the group measurement area; For the corresponding Foil thickness in the group measurement area; For the corresponding Roller ring width of the group measuring area; The foil wraps around half of the roll ring wrap angle; S33. Based on step S32, obtain the coverage Foil tension in the measuring area With coverage Foil tensile stress in the measuring area The relationship is: ； in, For the corresponding Foil tension in the group measuring area; For the corresponding The foil tensile stress in the group measurement area; For the corresponding Foil thickness in the group measurement area; For the corresponding Foil width of the group measurement area; S34: Foil tensile stress obtained according to step S32 , and get the corresponding Foil tension in the measuring area and the total tension of the foil in the entire measuring area , the specific expression is: ； S35: The total tension of the foil in all the measuring areas obtained in step S34 , and get the corresponding Average tensile stress of foil in the group measurement area , the specific expression is: ； in, is the total tension of the foil in the entire measuring area; is the foil width of the entire measuring area; is the foil thickness of the entire measurement area; S36: Foil tensile stress obtained according to step S32 and the average tensile stress of the foil obtained in step S35 , and get the corresponding Residual stress of foil in the measuring area , the specific expression is: ； S37, based on steps S31 to S36, obtain the plate shape according to the elastic modulus of the foil and the Poisson's ratio of the foil , the specific expression is: ； in, It is in plate shape; is the length difference between other points of the foil and the reference point; is the reference point length; is the maximum residual stress of the foil; is the minimum residual stress of the foil; is the elastic modulus of the foil; is the Poisson's ratio of the foil.

9. The measuring method of the foil pneumatic flatness detection device with built-in measuring module according to claim 8, characterized in that: In step S2, the annular detection gap at the first end and the annular detection gap at the second end are spaced at an angle of 180°.

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