Arc-shaped piezoelectric thin film flatness gauge

Abstract

The application relates to an arc-shaped piezoelectric film plate shape instrument, which comprises a transmission side bearing seat, a transmission side shaft head, a roller, a detection unit, a prestress adjusting assembly, a plug, an operation side bearing seat, an operation side shaft head, a signal amplifier, a connector and a chip board card; the transmission side shaft head and the operation side shaft head are coaxially arranged at the two ends of the roller and are supported by the bearing seats; the inner circumferences of the side walls of the roller are uniformly provided with a plurality of axial through holes; the side edge, which is connected with the roller, of the operation side shaft head is provided with an axial through slot corresponding to the through hole and a central through hole; the detection units are uniformly arranged in the axial through holes and are fixed between the roller inner wall and the prestress adjusting assembly through the inner ends; the plug is fixed in the axial through slot; the detection unit is connected with the signal amplifier through the connector; and the signal amplifier is connected with the chip board card. The application can effectively solve the signal deviation problems caused by the structural rigidity of the detection unit, installation precision, transient temperature change and local prestress.

Description

Technical Field

[0001] This invention relates to the field of metallurgical equipment automation technology, and in particular to an arc-shaped piezoelectric thin film plate shaper. Background Technology

[0002] The thinner the strip, the more prominent the shape defects become, and they are difficult to observe and evaluate with the naked eye. Currently, hidden shape defects have become a common problem affecting various ultra-thin strips. Therefore, accurately detecting and identifying these hidden shape defects will become a core research direction for improving strip quality. Traditional shape testing instruments are mainly contact-type, offering high precision, good stability, and strong anti-interference capabilities. However, contact-type shape testing instruments generally suffer from complex structures, difficult installation, and are easily affected by dynamic factors in the field (such as vibration, temperature, installation errors, and changes in wrap angle). Considering these factors, when designing new shape testing instruments, it is necessary to consider structural stiffness, stability, ease of installation, and minimal signal drift, while also taking into account the effects of local prestress, transient thermal stress, and channel coupling. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an arc-shaped piezoelectric thin film plate shape meter, which can effectively solve the signal deviation problems caused by structural stiffness, installation accuracy, transient temperature changes, and local prestress of the detection unit.

[0004] The technical solution adopted in this invention is as follows:

[0005] The present invention discloses an arc-shaped piezoelectric thin film shape measuring instrument, comprising a transmission-side bearing seat, a transmission-side shaft head, a roller, a detection unit, a prestress adjustment component, a plug, an operating-side bearing seat, an operating-side shaft head, a signal amplifier, a connector, and a chip board. The transmission-side shaft head and the operating-side shaft head are coaxially mounted at both ends of the roller. The outer side of the transmission-side shaft head is connected to the transmission-side bearing seat. The outer side of the operating-side shaft head is connected to the operating-side bearing seat. The inner circumference of the roller sidewall is evenly distributed with several axial through holes. The circumferential edge of the operating-side shaft head connected to the roller is provided with an axial through groove corresponding to the through holes, and a central through hole is provided at the shaft center. The detection units are evenly distributed in the axial through holes inside the roller sidewall, and their inner ends are fixed to the inner wall of the roller through the prestress adjustment component. The plug is fixed in the corresponding axial through groove. The output end of the detection unit passes through the central through hole of the operating-side shaft head and is connected to the input end of the signal amplifier through the connector. The output end of the signal amplifier is connected to the chip board.

[0006] Furthermore, the detection unit includes a piezoelectric thin film sensor, a base, and a support strip; the base is radially disposed inside the through hole and perpendicular to the side wall of the roller; the piezoelectric thin film sensor and the support strip are respectively disposed on the outer and inner sides of the base and respectively attached to the roller wall; a threaded hole is provided in the middle of the support strip, and the prestress adjustment component is attached to the base through the threaded hole.

[0007] Furthermore, the piezoelectric thin film sensor includes a cable, an arc-shaped piezoelectric thin film, an arc-shaped heat-insulating ceramic sheet, a PI insulating film, and a high-conductivity dielectric electrode sheet; the high-conductivity dielectric electrode sheet is respectively attached to the inner and outer surfaces of the arc-shaped piezoelectric thin film; the PI insulating film covers the outer side of the high-conductivity dielectric electrode sheet; the arc-shaped heat-insulating ceramic sheet is correspondingly attached to the outer surface of the outer PI insulating film and contacts the roller wall; one end of the cable is connected to the high-conductivity dielectric electrode sheet, and the other end is connected to the signal amplifier through a connector.

[0008] Furthermore, the arc-shaped piezoelectric film is a PVDF piezoelectric film.

[0009] Furthermore, the prestress adjustment assembly includes a high-strength bolt, an arc-shaped pad, and an elastic pad; the high-strength bolt is tightened from the inner wall of the roller through the threaded hole in the middle of the support bar to the bottom of the base, and locked by a nut; the arc-shaped pad is disposed between the nut and the inner wall of the roller; the elastic pad is disposed between the arc-shaped pad and the inner wall of the roller.

[0010] Furthermore, a disc spring is provided between the outer end of the high-strength bolt and the bottom of the base.

[0011] Furthermore, spacers are provided between the bases of each detection unit located in the same axial through hole inside the roller sidewall.

[0012] Furthermore, the signal amplifier, connector, and chip board are provided with a protective shell on their outer side.

[0013] Furthermore, the inside of the roller and the inside of the axial through hole are filled with heat-insulating, insulating, and high-temperature resistant adhesive.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. This invention uses an arc-shaped piezoelectric thin film as the sensitive element of the detection unit. It has the characteristics of wide frequency response, large dynamic range, high force-to-electric conversion sensitivity, high mechanical strength, and easy acoustic impedance matching. Compared with quartz and thermal insulation ceramics, it has the characteristics of large piezoelectric constant, wide frequency response, good mechanical strength, impact resistance, light weight, flexibility, easy acoustic impedance matching, easy processing into large area, less susceptible to water and general chemical pollution, and low price.

[0016] 2. The arc-shaped piezoelectric film can maximize overall deformation, improving the signal's adaptability to various working conditions. The detection unit is fixed using a support strip manufactured as a single unit, ensuring high positioning accuracy and reducing signal deviation caused by installation errors. It is also easy to assemble within the roller. Prestress is adjusted using supported butterfly-shaped elastic pads, elastic pads, arc-shaped pads, and high-strength screws. Aging treatment is performed before and after assembly to eliminate processing prestress. After aging, anaerobic sealant or welding screws are used to stabilize the prestress or internal stress state.

[0017] 3. After accurate signal verification, heat-insulating and high-temperature resistant adhesive is injected into the roller to facilitate cable fixing and thermal insulation. This high-stability arc-shaped piezoelectric film shaper fixes the signal amplifier and chip board to the operating side shaft head, quickly converting the pressure electrical signal into a digital signal, which is then transmitted wirelessly to the industrial control computer or rolling mill control system via 5G or WIFI for further processing, identification, and control of the shape signal. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the plate shape detection process of the present invention;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the roller of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the operating side shaft head of the present invention;

[0022] Figure 5 This is a schematic diagram of the detection unit and prestress adjustment assembly of the present invention;

[0023] Figure 6 This is a side view of the detection unit of the present invention;

[0024] Figure 7 This is a schematic diagram of the support strip of the present invention;

[0025] Figure 8 This is a schematic diagram of the structure of the piezoelectric thin film sensor of the present invention.

[0026] In the attached drawings, the following reference numerals are used: 1-Transmission side bearing seat; 2-Transmission side shaft head; 3-Roller; 4-Base; 5-High-strength bolt; 6-Arc-shaped washer; 7-Elastic pad; 8-Cable; 9-Plug; 10-Operating side shaft head; 11-Operating side bearing seat; 12-Protective housing; 13-Connector; 14-Signal amplifier; 15-Chip board; 16-Wireless antenna; 17-Strip; 18-Arc-shaped piezoelectric film; 19-Spacer; 20-Butterfly spring; 21-Arc-shaped heat-insulating ceramic sheet; 22-PI insulating film; 23-High conductivity dielectric electrode sheet; 24-Support bar. Detailed Implementation

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] It should be noted that in the description of this invention, the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not mean that the device or element must have a specific orientation, or be constructed and operated in a specific orientation.

[0029] See appendix Figures 1 to 8 This paper presents a specific structure of an embodiment of the arc-shaped piezoelectric film plate shaper proposed in this invention. The plate shaper includes a transmission-side bearing seat 1, a transmission-side shaft head 2, a roller 3, a detection unit, a prestress adjustment assembly, a plug 9, an operation-side shaft head 10, an operation-side bearing seat 11, a connector 13, a signal amplifier 14, and a chip board 15.

[0030] The transmission-side shaft head 2 and the operating-side shaft head 10 are coaxially mounted at the left and right ends of the roller 3, respectively. The outer side of the transmission-side shaft head 10 is connected to the transmission-side bearing seat rotating pair; the outer side of the operating-side shaft head 10 is connected to the operating-side bearing seat 11 rotating pair. Several axial through holes are evenly distributed around the inner circumference of the side wall of the roller 3. In this embodiment, the number of axial through holes is four. The circumferential edges of the transmission-side shaft head 2 and the operating-side shaft head 10 connected to the roller 3 are each provided with axial through grooves corresponding to the axial through holes. Furthermore, the operating-side shaft head 10 has a central through hole at its axis and a cylindrical cavity between it and the end of the roller 3. The detection unit is respectively... The detection units are evenly distributed in the axial through holes inside the sidewall of the roller 3, and the inner ends of the detection units are fixed to the inner wall of the roller 3 through prestress adjustment components. The plugs 9 are fixed in the axial through slots. The output end of the detection unit passes through the central through hole of the operating side shaft head 10 and is connected to the input end of the signal amplifier 14 through the connector 13. The output end of the signal amplifier 14 is connected to the chip board 15. The signal amplifier 14 and the chip board 15 are connected to the connector 13 and rotate synchronously with the roller 3. The signal can be transmitted to the industrial control computer or the rolling mill control system through the wireless antenna 16 for further signal processing, compensation, identification and control. The inside of the roller 3 and the inside of the axial through holes are filled with heat-insulating, insulating and high-temperature resistant glue to fix the wire bundle, and at the same time to provide heat insulation, moisture protection, shock protection, insulation and heat preservation, and improve the stability of the detection signal.

[0031] The detection unit includes a piezoelectric thin film sensor, a base 4, and a support bar 24. The base 4 is radially disposed within an axial through hole inside the roller 3 and is perpendicular to the roller wall. The piezoelectric thin film sensor and the support bar 24 are respectively disposed at the outer and inner ends of the base 4, and the piezoelectric thin film sensor and the support bar 24 are respectively attached to the roller wall. A threaded hole is provided in the middle of the support bar 24, and the prestress adjustment component is attached to the base 4 through the threaded hole.

[0032] In this embodiment, the piezoelectric thin-film sensor includes a cable 8, an arc-shaped piezoelectric thin film 18, an arc-shaped heat-insulating ceramic sheet 21, a PI insulating film 22, and a high-conductivity dielectric electrode sheet 23. The arc-shaped piezoelectric thin film 18 is a PVDF piezoelectric thin film. The high-conductivity dielectric electrode sheet 23 is respectively attached to the inner and outer surfaces of the arc-shaped piezoelectric thin film 18. The PI insulating film 22 covers the outer surface of the high-conductivity dielectric electrode sheet 23. The arc-shaped heat-insulating ceramic sheet 21 is correspondingly attached to the outer surface of the outer PI insulating film 22 and contacts the roller wall. One end of the cable 8 is connected to the high-conductivity dielectric electrode sheet 23, and the other end passes through the center hole of the operating side shaft head 10 and is connected to the input terminal of the signal amplifier 14 via a connector 13. The arc-shaped piezoelectric thin film 18 and the arc-shaped heat-insulating ceramic sheet 21 are bonded together and fixed in the axial through hole of the roller 3 by a butterfly spring 20 and a support bar 24. The advantage of the arc-shaped structure is that when the roller rotates, if it were a flat surface and the sensing element were a piezoelectric crystal, the radial pressure would change or there would be instantaneous off-center loading. This would cause a significant change in the prestress of the detection unit. The structure of the arc-shaped piezoelectric film 18 and the arc-shaped insulating ceramic sheet 21, on the one hand, improves the overall deformation stiffness due to the high-strength arc-shaped insulating ceramic sheet 21, and on the other hand, reduces signal errors caused by local off-center loading due to the highly flexible piezoelectric film. Furthermore, the structure using a supporting disc spring 20 and high-strength bolts 5 facilitates the sequential adjustment of the initial signal value or zero position of the detection units, achieving consistency in the signal range of each detection unit, and improving the detection accuracy and stability of the plate shape analyzer.

[0033] During operation, the arc-shaped insulating ceramic sheet 21 contacts the roller 3. When the corresponding position of the through hole in the roller 3 is subjected to force, the arc-shaped insulating ceramic sheet 21 transmits radial pressure, causing the arc-shaped piezoelectric film 18 to deform, thereby generating an electric charge. This arc-shaped structure can maximize the uniform force distribution. When the roller 3 rotates, the force distribution on one side of the arc-shaped insulating ceramic sheet 21 or the arc-shaped piezoelectric film 18 transitions from localized to full force distribution, and then to localized force distribution on the other side. The force distribution on the piezoelectric film is relatively smooth, which can reduce the signal deviation caused by dynamic changes in the wrap angle, thereby improving the detection accuracy and stability of the plate shape analyzer.

[0034] The prestress adjustment assembly includes a high-strength bolt 5, an arc-shaped washer 6, and an elastic washer 7. The high-strength bolt 5 is tightened from the inner wall of the roller 3 through a threaded hole in the middle of the support bar 24 towards the bottom of the base 4 and locked with a nut. The arc-shaped washer 6 is disposed between the nut and the inner wall of the roller 3. The elastic washer 7 is disposed between the arc-shaped washer 6 and the inner wall of the roller 3. In this embodiment, a disc spring 20 with support is also provided between the outer end of the high-strength bolt 5 and the bottom of the base 4. The prestress adjustment assembly applies a certain prestress to the detection unit, precisely adjusting each detection unit to its optimal initial value or signal range.

[0035] Spacers 19 are provided between the bases 4 of each detection unit located in the same axial through hole inside the side wall of the roller 3. The support bar 24 is used to ensure the spacing between each detection unit and to position it with the spacers 19. After positioning, the detection unit is sent as a whole into the axial through hole of the roller 3, thereby ensuring the accurate position of each detection unit and avoiding signal deviation caused by the installation error of each detection unit.

[0036] The connector 13, signal amplifier 14 and chip board 5 are provided with a protective shell 12 on their outer sides.

[0037] During installation, high-strength bolts 5, arc-shaped washers 6, and elastic pads 7 are used to fix the detection unit inside the roller 3, and the prestress is adjusted sequentially to obtain consistent sensitivity and signal range. After assembly, heat-insulating, high-temperature resistant adhesive is injected into the inside of the roller 3 to fix the cable 8, and the drive-side shaft head 2, the operating-side shaft head 10, and the plug 9 are welded to the roller 3 to seal and improve strength. During operation, the shape meter is mounted on the drive-side bearing seat 1 and the operating-side bearing seat 11. The detection unit receives the radial pressure on the surface of the roller 3, and transmits it through the cable 8 via the operating-side shaft head 10, using connector 13 to connect to the signal amplifier 14 and the chip board 15. After converting the electrical signal into a digital signal, it is transmitted to the industrial control computer or rolling mill control system via the wireless antenna 16 in the form of 5G or WIFI wireless signal.

[0038] like Figure 2 As shown, the strip shape detection process is as follows: when the strip 17 passes around the shape measuring instrument or roller 3, the tension is converted into radial pressure in a certain proportion, thereby generating different degrees of charge signals to the detection units inside the roller 3. Before assembly, the prestress or zero-point position of each detection unit must be calibrated using high-strength bolts 5, arc-shaped shims 6, and elastic pads 7. The prestress or zero-point position is adjusted by finely adjusting the high-strength bolts 5 with displacement, and the oscilloscope signal of the detection unit is used to determine whether the adjustment is in place. One, two, or four small through holes are usually arranged on the circumference of the roller 3 to obtain faster detection speeds or smoother, more stable signal values.

[0039] like Figure 3 As shown, the roller 3 must be aged before and after processing. Short rollers can be processed by wire cutting, while long rollers can be processed by first drilling deep holes symmetrically and then milling.

[0040] like Figure 4 As shown, the end face of the operating side shaft head 10 is milled with a through groove to facilitate the bundled cable 8 of the detection unit to be connected to the connector 13 through the center hole.

[0041] All matters not covered in this invention are common knowledge.

[0042] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An arc-shaped piezoelectric thin film flatness gauge, characterized by: The plate-shaped instrument comprises a driving-side bearing seat, a driving-side shaft head, a roller, a detection unit, a prestress adjusting assembly, a plug, an operating-side bearing seat, an operating-side shaft head, a signal amplifier, a connector and a chip board card; the driving-side shaft head and the operating-side shaft head are coaxially installed at two ends of the roller respectively; the outer side of the driving-side shaft head is connected with the driving-side bearing seat; the outer side of the operating-side shaft head is connected with the operating-side bearing seat; the inner side wall of the roller is uniformly provided with a plurality of axial through holes; the circumferential edge of the side of the operating-side shaft head connected with the roller is provided with an axial through slot corresponding to the through hole, and a central through hole is arranged at the shaft center; the detection unit is arranged in the axial through hole in the inner side wall of the roller respectively, and the inner end is fixed between the inner wall of the roller and the prestress adjusting assembly respectively; the plug is fixed in the axial through slot; the output end of the detection unit is connected with the input end of the signal amplifier through the connector after passing through the central through hole of the operating-side shaft head; the output end of the signal amplifier is connected with the chip board card; The detection unit comprises a piezoelectric film sensor, a base and a support strip; the base is radially arranged in the through hole and is perpendicular to the side wall of the roller; the piezoelectric film sensor and the support strip are arranged on the outer side and the inner side of the base respectively and are attached to the roller wall respectively; a threaded hole is arranged in the middle of the support strip, and the prestress adjusting assembly is attached to the base through the threaded hole; The piezoelectric film sensor comprises a cable, an arc-shaped piezoelectric film, an arc-shaped heat insulation ceramic sheet, a PI insulating film and a high-conductivity medium electrode sheet; the high-conductivity medium electrode sheet is attached to the inner surface and the outer surface of the arc-shaped piezoelectric film respectively; the PI insulating film is covered on the outer side of the high-conductivity medium electrode sheet respectively; the arc-shaped heat insulation ceramic sheet is attached to the outer surface of the PI insulating film on the outer side and is in contact with the roller wall; one end of the cable is connected with the high-conductivity medium electrode sheet, and the other end is connected with the signal amplifier through the connector; The prestress adjusting assembly comprises a high-strength bolt, an arc-shaped pad and an elastic pad; the high-strength bolt is tightened from the inner wall of the roller to the bottom of the base through the threaded hole in the middle of the support strip and is locked by a nut; the arc-shaped pad is arranged between the nut and the inner wall of the roller; the elastic pad is arranged between the arc-shaped pad and the inner wall of the roller.

2. An arc-shaped piezoelectric thin film flatness gauge according to claim 1, characterized in that: The arc-shaped piezoelectric film is a PVDF piezoelectric film.

3. An arc-shaped piezoelectric thin film flatness gauge according to claim 1, characterized in that: A disc spring is arranged between the outer end of the high-strength bolt and the bottom of the base.

4. An arc-shaped piezoelectric thin film flatness gauge according to claim 1, characterized in that: A spacing sheet is arranged between the bases of the detection units in the same axial through hole in the inner side wall of the roller.

5. An arc-shaped piezoelectric thin film flatness gauge according to claim 1, characterized in that: The outer sides of the signal amplifier, the connector and the chip board card are provided with a protective shell.

6. An arc-shaped piezoelectric thin film flatness gauge according to claim 1, characterized in that: The inner part of the roller and the inner part of the axial through hole are filled with heat insulation and insulation high-temperature resistant glue.

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