PVDF sensor for high-load vibration detection

Abstract

The invention provides a PVDF (Polyvinylidene Fluoride) sensor for high-load vibration detection. The PVDF sensor comprises a polyimide sleeve and a PVDF film, the polyimide sleeve comprises a detection part and a connection part which are integrally formed, one side of the connection part is fixedly connected with a lead wire end, one side of the connection part is symmetrically provided with hollow riveting pieces, one side of the detection part is integrally formed with a lockrand, the inner part of the lockrand is fixedly connected with an inner filling ring, and the inner filling ring is internally provided with an outer filling ring. Anti-skid grooves are formed in the two sides of the detection part at equal intervals; the PVDF film is arranged in the detection part, and an insulating rubber sleeve is fixedly connected to the interior of the polyimide sleeve; the first electrode and the second electrode are mounted by arranging the insulating rubber sleeve, the first electrode and the second electrode are separately fixed in the polyimide sleeve, and the PVDF film is clamped with the insulating rubber sleeve, so that the first electrode and the second electrode are connected with the PVDF film through the conductive silver adhesive and the limiting groove, and the first electrode and the second electrode are prevented from being separated from the PVDF film.

Description

Technical Field

[0001] The invention relates to a vibration detection sensor, in particular to a PVDF sensor for high-load vibration detection, belonging to the technical field of flexible sensors. Background Art

[0002] The excellent flexibility and formability of PVDF film make it easy to be applied to many sensor products. Compared with semiconductor piezoresistive sensors, PVDF sensors are more adaptable to dynamic modal testing and have certain advantages over piezoelectric ceramic transducers in terms of structural integration.

[0003] A Chinese patent application (CN202010201290.1) discloses a flexible vibration sensor based on PVDF film and a preparation method thereof. The sensor proposed in the application has good flexibility and ductility, can be freely bent or even folded, and has a flexible and diverse structure. It can be arbitrarily arranged according to the requirements of the surface conditions of the measured object, and can very conveniently detect the complex surface of the measured object. However, the application still has the following technical problems when used:

[0004] 1. When used for high-load vibration detection of heavy equipment, since the sensor is placed between the base and the equipment, the equipment presses on the sensor, which can easily cause the sensor to shift and misalign due to vibration, affecting the detection accuracy;

[0005] Second, there is a lack of protective measures for the PVDF film. The overall deformation range of the sensor is not limited. When under pressure, it is easy to cause the PVDF film to wear due to vibration, or cause the electrode to separate from the PVDF film;

[0006] In order to solve the above technical problems, a PVDF sensor for high-load vibration detection is proposed. Summary of the invention

[0007] In view of this, the present invention provides a PVDF sensor for high-load vibration detection to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0008] The technical solution of the present invention is implemented as follows: a PVDF sensor for high-load vibration detection comprises a polyimide sleeve and a PVDF film;

[0009] The polyimide sleeve comprises an integrally formed detection part and a connection part, one side of the connection part is fixedly connected to a lead end, one side of the connection part is symmetrically installed with a hollow rivet, one side of the detection part is integrally formed with a lock edge, the inside of the lock edge is fixedly connected with an inner filling ring, both sides of the detection part are equidistantly provided with anti-slip grooves, both sides of the detection part are provided with grooves, and the inside of the grooves is fixedly connected with a hot melt adhesive ring;

[0010] The PVDF film is arranged inside the detection part, the inside of the polyimide sleeve is fixedly connected to an insulating rubber sleeve, the inside of the insulating rubber sleeve is provided with two installation grooves, the insides of the installation grooves are respectively fixedly connected to a first electrode and a second electrode, both sides of the PVDF film are integrally formed with limiting grooves, and the first electrode and the second electrode are engaged with the PVDF film through the limiting grooves.

[0011] Further preferably, the interior of the limiting groove is coated with conductive silver paste.

[0012] Further preferably, a memory alloy film is fixedly connected inside the detection part of the polyimide sleeve.

[0013] Further preferably, through holes are evenly distributed inside the memory alloy film.

[0014] Further preferably, a slot is integrally formed on one side of the insulating rubber sleeve, and a raised edge is integrally formed on one side of the PVDF film, and the raised edge is engaged with the insulating rubber sleeve via the slot.

[0015] Further preferably, both sides of the PVDF film are fixedly connected with a hydrogel layer.

[0016] Further preferably, the materials of the first electrode and the second electrode are platinum, silver, copper or gold.

[0017] Further preferably, the PVDF film is in a rounded rectangular shape, and the first electrode and the second electrode are in an L-shape.

[0018] Further preferably, the area of ​​the first electrode and the second electrode close to the PVDF film is smaller than the area of ​​the PVDF film.

[0019] The embodiment of the present invention has the following advantages due to the adoption of the above technical solution:

[0020] 1. The present invention installs the first electrode and the second electrode by providing an insulating rubber sleeve, separates and fixes the first electrode and the second electrode in the polyimide sleeve, and engages the PVDF film with the insulating rubber sleeve, so that the first electrode and the second electrode are connected to the PVDF film through the conductive silver glue and the limit groove, so as to prevent the first electrode and the second electrode from being separated from the PVDF film, and provides a locking edge on one side of the polyimide sleeve, and fills the locking edge with an inner filling ring, so as to limit the stress deformation amplitude of the polyimide sleeve, and prevent the PVDF film from being worn due to excessive pressure;

[0021] 2. The present invention prevents the polyimide sleeve from sliding and causing dislocation by providing an anti-slip groove in combination with a hot-melt rubber ring, thereby enhancing the friction between the polyimide sleeve and the contact surface between the device and the base, and preventing the position of the present invention from shifting due to vibration.

[0022] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural diagram of the present invention;

[0025] Figure 2 This is a diagram of the installation structure of the hot melt adhesive ring in the present invention;

[0026] Figure 3 It is a cross-sectional structural diagram of the edge locking in the present invention;

[0027] Figure 4 The internal structure diagram of the polyimide sleeve in the present invention;

[0028] Figure 5 is a cross-sectional structural diagram of the polyimide sleeve in the present invention;

[0029] Figure 6 This is a connection structure diagram of the insulating rubber sleeve in the present invention;

[0030] Figure 7 It is a connection structure diagram of the PVDF film in the present invention;

[0031] Figure 8 It is a structural diagram of the insulating rubber sleeve in the present invention.

[0032] Figure numerals: 11, polyimide sleeve; 12, hot-melt adhesive ring; 13, anti-slip groove; 14, lock edge; 15, hollow rivet; 16, lead end; 17, groove; 18, inner filling ring; 19, insulating rubber sleeve; 21, hydrogel layer; 22, memory alloy film; 23, through hole; 24, PVDF film; 25, first electrode; 26, second electrode; 27, limit groove; 28, conductive silver glue; 29, raised edge; 31, card slot; 32, installation slot. DETAILED DESCRIPTION

[0033] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0034] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] like Figure 1-8 As shown, an embodiment of the present invention provides a PVDF sensor for high-load vibration detection, which is composed of a polyimide sleeve 11, a PVDF film 24, a first electrode 25, a second electrode 26 and a lead terminal 16.

[0036] The polyimide sleeve 11 is integrally formed with a detection part and a connection part, the lead end 16 is fixedly connected to the connection part, and a hollow rivet 15 is symmetrically installed at the connection between the lead end 16 and the connection part, and the hollow rivet 15 is fixedly connected to the lead end 16. A lock edge 14 is integrally formed on one side of the detection part, and an inner filling ring 18 is fixedly connected to the inside of the lock edge 14. The inner filling ring 18 limits the compression deformation amplitude of the polyimide sleeve 11 to prevent excessive pressure from causing wear of the internal PVDF film 24. In order to increase the friction between the polyimide sleeve 11 and the contact surface of the equipment and the base, anti-skid grooves 13 are equidistantly provided on both sides of the detection part, and grooves 17 are provided on both sides of the detection part. A hot-melt adhesive ring 12 is fixedly connected to the inside of the groove 17. The hot-melt adhesive ring 12 is slightly melted by the friction heat generated during high-frequency vibration, and the polyimide sleeve 11 is adhered to the base or equipment to prevent the polyimide sleeve 11 from being dislocated due to vibration.

[0037] The PVDF film 24 is arranged inside the detection part, and the insulating rubber sleeve 19 is fixedly connected inside the polyimide sleeve 11. Two installation grooves 32 are provided inside the insulating rubber sleeve 19. The first electrode 25 and the second electrode 26 are fixedly connected inside the installation grooves 32 respectively. The limiting grooves 27 are integrally formed on both sides of the PVDF film 24. The first electrode 25 and the second electrode 26 are engaged with the PVDF film 24 through the limiting grooves 27. The first electrode 25 and the second electrode 26 are connected to the PVDF film 24 through the limiting grooves 27 to prevent the first electrode 25 and the second electrode 26 from being misaligned and separated from the PVDF film 24, and the installation positions of the first electrode 25 and the second electrode 26 are limited so that the PVDF film 24 is located between the first electrode 25 and the second electrode 26, and the first electrode 25 and the second electrode 26 are not in contact with each other, while the first electrode 25 and the second electrode 26 are in contact with the PVDF film 24.

[0038] In one embodiment, the interior of the limiting groove 27 is coated with a conductive silver paste 28 , and the first electrode 25 and the second electrode 26 are connected and fixed to the PVDF film 24 by electroplating through the conductive silver paste 28 .

[0039] In one embodiment, a memory alloy film 22 is fixedly connected to the inside of the detection part of the polyimide sleeve 11, and through holes 23 are evenly distributed inside the memory alloy film 22. The through holes 23 reduce the weight of the memory alloy film 22, making the whole body lighter, and make the memory alloy film 22 more easily deformed, thereby improving the fit between the sensor and the base and the equipment. After use, the memory alloy film 22 is used to assist in resetting, thereby preventing the sensor from being unable to be reset due to excessive deformation during use.

[0040] Optionally, the material of the first electrode 25 and the second electrode 26 is platinum, silver, copper or gold.

[0041] Optionally, the PVDF film 24 is in a rounded rectangular shape, and the first electrode 25 and the second electrode 26 are in an L-shape.

[0042] In one embodiment, in order to prevent the PVDF film 24 from shifting, a card slot 31 is integrally formed on one side of the insulating rubber sleeve 19, and a raised edge 29 is integrally formed on one side of the PVDF film 24. The raised edge 29 is engaged with the insulating rubber sleeve 19 through the card slot 31. The card slot 31 cooperates with the raised edge 29 to limit the PVDF film 24 and facilitate the installation of the PVDF film 24.

[0043] In one embodiment, both sides of the PVDF film 24 are fixedly connected with a hydrogel layer 21. The hydrogel layer 21 acts as a dispersion medium when bearing force to decompose friction and shear force, so that the PVDF film 24 can bear force in an accurate direction and improve the sensitivity of vibration detection.

[0044] In one embodiment, the area of ​​the first electrode 25 and the second electrode 26 close to the PVDF film 24 is smaller than the area of ​​the PVDF film 24 , so as to prevent the first electrode 25 and the second electrode 26 from contacting each other.

[0045] In one embodiment, the polyimide sleeve 11 is directly integrally formed on the assembly of the insulating rubber sleeve 19 and the PVDF film 24 , so that the polyimide sleeve 11 completely covers the assembly.

[0046] The present invention is in operation: during processing, the insulating rubber sleeve 19 and the PVDF film 24 are first assembled, the first electrode 25 and the second electrode 26 are installed in the insulating rubber sleeve 19, and the first electrode 25 and the second electrode 26 are symmetrically arranged, so that the PVDF film 24 is engaged with the slot 31 of the insulating rubber sleeve 19 through the raised edge 29, and the PVDF film 24 is located between the first electrode 25 and the second electrode 26, and the conductive silver glue 28 is coated in the limiting groove 27 of the PVDF film 24, and the first electrode 25 and the second electrode 26 are connected and fixed to the PVDF film 24 by electroplating, so that the first electrode 25 and the second electrode 26 are both located in the limiting groove 27, and the hydrogel layer 21 is fixed on both sides of the PVDF film 24, so that the hydrogel layer 21 and the insulating rubber sleeve 19 are attached, and the memory alloy film 22 is placed on one side of the hydrogel layer 21, and the polyimide sleeve 11 is directly integrally formed on the combination of the insulating rubber sleeve 19 and the PVDF film 24 On the component, the polyimide sleeve 11 is used to cover the assembly, and the lead end 16 is connected. The hollow rivet 15 is installed at the connection between the polyimide sleeve 11 and the lead end 16, and the lead end 16 is connected to the first electrode 25 and the second electrode 26. Then, the hot melt adhesive ring 12 is fixed at the groove 17 of the polyimide sleeve 11. When in use, the part with the PVDF film 24 is placed between the base and the device, so that it fits with the device and the base for vibration detection. During the detection process, the hydrogel layer 21 is used as a dispersion medium when bearing force to decompose friction and shear force, so that the bearing direction of the PVDF film 24 is accurate, and the sensitivity of vibration detection is improved. When vibrating, the hot melt adhesive ring 12 is slightly melted by the frictional heat generated, and the polyimide sleeve 11 is adhered to the specified position, and the anti-slip groove 13 is used to prevent displacement and dislocation. After use, the sensor is smoothed and reset, and the memory alloy film 22 is used to smooth the whole, and the damaged hot melt adhesive ring 12 can be replaced.

[0047] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A PVDF sensor for high load vibration detection, characterized in that: It comprises a polyimide sleeve (11) and a PVDF film (24); The polyimide sleeve (11) comprises an integrally formed detection part and a connection part, a lead end (16) is fixedly connected to one side of the connection part, a hollow rivet (15) is symmetrically installed on one side of the connection part, a locking edge (14) is integrally formed on one side of the detection part, an inner filling ring (18) is fixedly connected inside the locking edge (14), anti-slip grooves (13) are evenly distributed on both sides of the detection part, grooves (17) are opened on both sides of the detection part, and a hot melt adhesive ring (12) is fixedly connected inside the groove (17); The PVDF film (24) is arranged inside the detection part, the inside of the polyimide sleeve (11) is fixedly connected to an insulating rubber sleeve (19), the inside of the insulating rubber sleeve (19) is provided with two installation grooves (32), the inside of the installation grooves (32) are respectively fixedly connected to a first electrode (25) and a second electrode (26), both sides of the PVDF film (24) are integrally formed with limiting grooves (27), and the first electrode (25) and the second electrode (26) are engaged with the PVDF film (24) through the limiting grooves (27).

2. A PVDF sensor for high load vibration detection according to claim 1, characterized in that: The interior of the limiting groove (27) is coated with conductive silver glue (28).

3. A PVDF sensor for high load vibration detection according to claim 1, characterized in that: A memory alloy film (22) is fixedly connected inside the detection part of the polyimide sleeve (11).

4. A PVDF sensor for high load vibration detection according to claim 3, characterized in that: The memory alloy film (22) is provided with through holes (23) distributed evenly inside.

5. A PVDF sensor for high load vibration detection according to claim 1, characterized in that: A clamping groove (31) is integrally formed on one side of the insulating rubber sleeve (19), and a raised edge (29) is integrally formed on one side of the PVDF film (24), wherein the raised edge (29) is clamped with the insulating rubber sleeve (19) via the clamping groove (31).

6. A PVDF sensor for high load vibration detection according to claim 1, characterized in that: The two sides of the PVDF film (24) are fixedly connected with a hydrogel layer (21).

7. A PVDF sensor for high load vibration detection according to claim 1, characterized in that: The materials of the first electrode (25) and the second electrode (26) are platinum, silver, copper or gold.

8. A PVDF sensor for high load vibration detection according to claim 1, characterized in that: The PVDF film (24) is in the shape of a rounded rectangle, and the first electrode (25) and the second electrode (26) are in the shape of an L.

9. A PVDF sensor for high load vibration detection according to claim 1, characterized in that: The area of ​​the first electrode (25) and the second electrode (26) close to the PVDF film (24) is smaller than the area of ​​the PVDF film (24).

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