Papermaking felt and monitoring system thereof

Abstract

The invention provides a papermaking felt and a monitoring system thereof, the papermaking felt comprises a monitoring bottom net layer and two outer surface layers, the monitoring bottom net layer is clamped between the two outer surface layers, the monitoring bottom net layer comprises sensing yarns and weaving yarns, the sensing yarns and the weaving yarns are mutually woven, and the sensing yarns and the weaving yarns are mutually woven. The sensing yarn comprises a yarn main body and a detection main body wound on the yarn main body, the detection main body comprises a bearing base body and a detection element, and the detection element is borne on the bearing base body and is used for monitoring the stress of the papermaking felt. Therefore, the detection element is borne by the bearing base body to form a detection body, the detection element can sense the borne pressure, the detection body is wound around the yarn body to form sensing yarn, the sensing yarn and the weaving yarn are woven to form a monitoring bottom net layer, and the monitoring bottom net layer is connected between the two outer surface layers to form the papermaking felt. Therefore, the sensing yarn can detect pressure caused by fatigue of the papermaking felt or external pressure outside the papermaking felt.

Description

Technical Field

[0001] The present application relates to the technical field of papermaking felts, and particularly to a papermaking felt and its monitoring system. Background Art

[0002] Papermaking felts are used in paper machines for dewatering, pressing, and conveying wet paper webs. It not only transports wet paper sheets but also enhances the paper strength and surface smoothness through functions such as dewatering by pressing, leveling the paper surface, and improving the surface characteristics of the paper. However, during use, papermaking felts will experience structural fatigue due to repeated compression, which affects the performance of the paper and the service life of the papermaking felt itself.

[0003] In the prior art, the fatigue state of papermaking felts can only be tested indirectly. For example, indirect tests are carried out through wear resistance testing equipment or through the dewatering efficiency of papermaking felts, rather than directly monitoring the pressure and strain of papermaking felts. Summary of the Invention

[0004] The main purpose of the present application is to provide a papermaking felt and its monitoring system, aiming to solve the above-mentioned technical problems existing in the prior art.

[0005] To solve the above problems, the present application provides a papermaking felt, which includes a monitoring base net layer and two outer surface layers. The monitoring base net layer is sandwiched between the two outer surface layers. The monitoring base net layer includes sensing yarns and weaving yarns, and the sensing yarns and the weaving yarns are woven with each other. The sensing yarns include yarn bodies and detection bodies wound around the yarn bodies. The detection bodies include bearing substrates and detection elements, and the detection elements are carried on the bearing substrates. The detection elements are used to monitor the force on the papermaking felt.

[0006] In some embodiments, the detection elements include communication elements, connecting wires, and induction elements. The communication elements are electrically connected to the induction elements through the connecting wires, and the induction elements are used to sense pressure.

[0007] In some embodiments, the number of the connecting wires and the induction elements is two. The two connecting wires are spaced apart in the winding direction of the detection body. The communication element is located between the two connecting wires and is electrically connected to the two connecting wires. The two induction elements are respectively located at one end of a connecting wire away from the communication element.

[0008] In some embodiments, the induction elements include conductive fillers and flexible substrates, and the conductive fillers are evenly distributed in the flexible substrates.

[0009] In some embodiments, the induction elements and the bearing substrates are flat-shaped, and the induction elements are arranged opposite to the bearing substrates.

[0010] In some embodiments, the bearing substrate extends in the winding direction of the detection body, and one side of the bearing substrate facing away from the detection element is attached to the outer side wall of the braided yarn.

[0011] In some embodiments, the two connection wires, the communication element, and the two induction elements are all embedded in the bearing substrate.

[0012] In some embodiments, the number of detection elements is multiple, and the multiple detection elements are spaced apart on the bearing substrate in the winding direction of the detection body.

[0013] In some embodiments, the radial dimensions of the braided yarn and the sensing yarn are the same.

[0014] To solve the above problems, the present application provides a monitoring system, which includes a communication terminal and the above-mentioned papermaking felt, and the communication terminal is used for wireless communication with the papermaking felt.

[0015] Compared with the prior art, the papermaking felt provided by the present application includes a monitoring base layer and two outer surface layers. The monitoring base layer is sandwiched between the two outer surface layers. The monitoring base layer includes a sensing yarn and a braided yarn. The sensing yarn and the braided yarn are woven with each other. The sensing yarn includes a yarn body and a detection body wound around the yarn body. The detection body includes a bearing substrate and a detection element. The detection element is carried on the bearing substrate, and the detection element is used for force detection of the papermaking felt. Through the above implementation manner, the papermaking felt includes a detection element and a bearing substrate. The detection element is carried on the bearing substrate to form a detection body. The detection element is used to detect the force condition of the papermaking felt. The detection body is wound around the yarn body to form a sensing yarn. The sensing yarn and the braided yarn are woven with each other to form a monitoring base layer. The monitoring base layer is connected between the two outer surface layers to form a papermaking felt, so that the sensing yarn can detect the pressure due to the fatigue of the papermaking felt or the external pressure other than the papermaking felt. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a schematic structural diagram of an embodiment of the monitoring system provided by the present application;

[0018] Figure 2 is Figure 1 a cross-sectional view of an embodiment of the papermaking felt shown;

[0019] Figure 3 isFigure 2 Schematic structural diagram of an embodiment of the monitored bottom net layer;

[0020] Figure 4 is Figure 3 Schematic structural diagram of an embodiment of the sensing yarn shown;

[0021] Figure 5 is Figure 4 Schematic structural diagram of an embodiment of the detection main body shown;

[0022] Figure 6 is Figure 5 Schematic structural diagram of an embodiment of the detection element shown;

[0023] Figure 7 is the relationship curve graph of the power and frequency of the second electromagnetic signal provided by this application;

[0024] Figure 8 is the relationship curve graph of the resonance frequency and strain of the second electromagnetic signal provided by this application;

[0025] Figure 9 is Figure 6 Schematic structural diagram of an embodiment of the induction element shown.

[0026] Reference numerals: papermaking felt 1; monitored bottom net layer 10; sensing yarn 100; detection main body 110; detection element 111; communication element 1111; connecting wire 1112; induction element 1113; conductive filler 1114; flexible matrix 1115; bearing matrix 112; yarn main body 120; braided yarn 200; outer surface layer 20; communication terminal 2. Detailed implementation manners

[0027] Hereinafter, embodiments of the technical solutions of this application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of this application more clearly, and thus are only examples and cannot be used to limit the protection scope of this application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0029] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features.

[0030] Reference to "embodiment" in this text means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0032] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0033] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the embodiments of the present application.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may also be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0035] In the papermaking process, the papermaking equipment includes a papermaking felt and transmission roller wheels. The wet paper sheet is laid on the papermaking felt, and the papermaking felt can dewater the wet paper sheet. The papermaking felt is usually arranged on the transmission roller wheels to act as a conveyor belt, so that the papermaking felt can convey and transfer the wet paper sheet. The papermaking equipment also includes a pair of pressure roller wheels, which can be arranged opposite to some of the transmission roller wheels, so that the papermaking felt conveying the wet paper sheet is located between the transmission roller wheels and the pair of pressure roller wheels to squeeze and dewater the wet paper sheet and the papermaking felt.

[0036] However, during the use of the papermaking felt, the structure will be fatigued due to repeated pressure, which will affect the performance of the paper and the service life of the papermaking felt itself. In the prior art, only an indirect method can be used to test the fatigue state of the papermaking felt. For example, through wear resistance testing equipment or through the dehydration efficiency of the papermaking felt for indirect testing, rather than directly monitoring the pressure and strain of the papermaking felt.

[0037] To solve the related technical problems, this application provides a monitoring system. For details, please refer to Figure 1 , Figure 1 which is a schematic structural diagram of an embodiment of the monitoring system provided by this application.

[0038] The monitoring system includes a communication terminal 2 and the following papermaking felt 1. The communication terminal 2 is used for wireless communication with the papermaking felt 1.

[0039] The monitoring system includes a communication terminal 2 and a papermaking felt 1 with a sensing function. The communication terminal 2 can perform wireless communication with the papermaking felt 1. When the papermaking felt 1 is under pressure to dewater the wet paper sheet, the papermaking felt 1 can transmit the detected data information to the communication terminal 2. Specifically, the communication terminal 2 can include a radio frequency reader-writer and a host computer. The radio frequency reader-writer is electrically connected to the host computer. The radio frequency reader-writer transmits the data information received from the papermaking felt 1 to the host computer, and the data information is processed by the host computer, and then the force-bearing condition of the papermaking felt 1 can be displayed in real time. Furthermore, according to the force-bearing condition of the papermaking felt 1, it can be judged whether the force on the papermaking felt 1 is uniform, whether the papermaking felt 1 has compression fatigue, hardening or local wear, and also according to the monitored pressure and dehydration efficiency, the pressure applied to the papermaking felt 1 can be adjusted to achieve the best dehydration efficiency and optimize energy consumption.

[0040] To solve the above problems, this application also provides a papermaking felt. For details, please refer to Figures 2 to 5 , Figure 2 which is Figure 1 a cross-sectional view of an embodiment of the papermaking felt shown. Figure 3 which is Figure 2 a schematic structural diagram of an embodiment of the monitoring base net layer shown. Figure 4 which is Figure 3Schematic structural diagram of an embodiment of the sensing yarn shown. Figure 5 is Figure 4 Schematic structural diagram of an embodiment of the detection body shown.

[0041] The papermaking felt 1 includes a monitoring base net layer 10 and two outer surface layers 20. The monitoring base net layer 10 is clamped between the two outer surface layers 20. The monitoring base net layer 10 includes a sensing yarn 100 and a knitting yarn 200. The sensing yarn 100 and the knitting yarn 200 are woven with each other. The sensing yarn 100 includes a yarn body 120 and a detection body 110 wound around the yarn body 120. The detection body 110 includes a bearing matrix 112 and a detection element 111. The detection element 111 is carried on the bearing matrix 112. The detection element 111 is used to monitor the force on the papermaking felt 1.

[0042] The monitoring base net layer 10 has the function of monitoring pressure. The monitoring base net layer 10 is clamped between the two outer surface layers 20, so that the monitoring base net layer 10 can be protected. The monitoring base net layer 10 can be combined with the outer surface layer 20 through knitting threads, thereby increasing the service life of the monitoring base net layer 10. The monitoring base net layer 10 includes a sensing yarn 100 with a sensing function and a knitting yarn 200. The sensing yarn 100 and the knitting yarn 200 are woven with each other to form the monitoring base net layer 10. The sensing yarn 100 and the knitting yarn can be woven in the weft direction and the warp direction respectively. The weft direction can be understood as the direction of weaving the weft yarn in the weaving process, and the warp direction can be understood as the direction of weaving the warp yarn in the weaving process. The sensing yarn 100 can be embedded in the knitting yarn 200 by a knitting machine according to a preset path. When the sensing yarn 100 is introduced each time, it is necessary to adjust the weft insertion tension and the beating force of the knitting machine, so as to reduce the risk of damage to the sensing yarn 100 during the weaving process. The sensing yarn 100 can include a yarn body 120 and a detection body 110. Both the detection body 110 and the yarn body 120 can be understood as linear structures. The detection body 110 is wound around the yarn body 120. The yarn body 120 can be aramid and polyester. Aramid and polyester have good elasticity, so that when the sensing yarn 100 is deformed under pressure, it has a high elongation rate, which can reduce the risk of excessive deformation of the sensing yarn 100 caused by excessive force and damage to the sensing yarn 100. The detection body 110 can include a detection element 111 and a bearing matrix 112. The detection element 111 can detect the force on the papermaking felt 1. The detection element 111 is carried on the bearing matrix 112, so that the detection element 111 is wound around the yarn body 120 through the bearing matrix 112, so that the papermaking felt 1 can monitor its own force condition through the sensing yarn 100.

[0043] In this embodiment, after the detection body 110 is wound around the yarn body 120, a protective layer can be coated on the surface of the whole of the two. The protective layer has the functions of insulation and waterproofing, which can reduce the risk of damage to the sensing yarn 100 caused by foreign objects invading the sensing yarn 100. Specifically, the protective layer can be formed by coaxially scraping and coating one or more layers of polytetrafluoroethylene materials on the surface of the whole of the detection body 110 and the yarn body 120, so that the detection body 110 has a relatively long service life. The weft direction of the braided sensing yarn 100 can be the same as the length direction of the papermaking felt 1. It can be understood that the length direction of the papermaking felt 1 is consistent with the conveying direction of the papermaking felt 1 on the roller, and the warp direction can be understood as the direction perpendicular to the length of the papermaking felt 1. Moreover, the number of the sensing yarns 100 can be multiple, and the multiple sensing yarns 100 can be arranged in the warp direction. Specifically, the multiple sensing yarns 100 can be evenly spaced in the warp direction, so that the detection elements 111 are evenly distributed on the papermaking felt 1 in the warp direction, and thus the force distribution of the papermaking felt 1 can be monitored in the warp direction. The sensing yarns 100 can also be arranged at intervals in the warp direction according to actual needs, and the number of the sensing yarns 100 can be appropriately increased at the positions with large detection requirements. Of course, the sensing yarn 100 and the braided yarn 200 can also be braided in other directions, as long as the braiding directions of the sensing yarn 100 and the braided yarn 200 intersect. The sensing yarn 100 and the braided yarn 200 can have different braiding directions and methods to change the tissue structure of the monitoring base layer 10. For example, the monitoring base layer 10 can have tissue structures such as plain weave, twill weave and broken twill weave, and the water filtration performance of the monitoring base layer 10 is affected by these tissue structures to be applicable to different types of paper machines and types of wet paper sheets. In addition, the papermaking felt 1 can also include a fiber layer, and the fiber layer is located on the side of the outer surface layer 20 close to the wet paper sheet and far from the monitoring base layer 10. The fiber layer can dehydrate the wet paper sheet. The fiber layer can be formed by laying cotton polyamide staple fibers with different diameters in layers, and thus can have a better dehydration effect on the wet paper sheet. The fiber layer and the outer surface layer 20 can be combined together by needling process.

[0044] Through the above implementation manner, the papermaking felt 1 includes a detection element 111 and a bearing matrix 112. The detection element 111 is carried on the bearing matrix 112 to form a detection body 110. The detection element 111 is used to detect the force condition of the papermaking felt 1. The detection body 110 is wound around the yarn body 120 to form a sensing yarn 100. The sensing yarn 100 and the braided yarn 200 are woven with each other to form a monitoring base layer 10. The monitoring base layer 10 is connected between two outer surface layers 20 to form the papermaking felt 1, so that the sensing yarn 100 can detect the pressure caused by the fatigue of the papermaking felt 1 or the external pressure outside the papermaking felt 1.

[0045] See Figure 6 ,Figure 6 is Figure 5 A schematic structural diagram of an embodiment of the detection element shown in the figure.

[0046] In some embodiments, the detection element 111 includes a communication element 1111, a connecting wire 1112, and a sensing element 1113. The communication element 1111 is electrically connected to the sensing element 1113 through the connecting wire 1112, and the sensing element 1113 is used to sense pressure.

[0047] The communication element 1111 is electrically connected to the sensing element 1113 through the connecting wire 1112. The sensing element 1113 is used to sense the external pressure applied. The external pressure may be caused by the pressure generated on the sensing element 1113 due to the aging or fatigue of various wires used for weaving. When the sensing element 1113 is subjected to pressure, its resistance changes. The communication element 1111 is electrically connected to the sensing element 1113 through the connecting wire 1112, so that the communication element 1111 can receive different electrical signals due to the resistance change of the sensing element 1113. Furthermore, the communication element 1111 can send the data information of the different electrical signals received to the communication terminal 2 to realize the monitoring of the pressure of the papermaking felt 1. In this embodiment, the radio frequency reader / writer of the communication terminal 2 can transmit a first electromagnetic signal to the detection element 111. The connecting wire 1112 is within the range of the first electromagnetic signal and generates an alternating induced current, thereby realizing wireless power supply for the communication element 1111. The first electromagnetic signal can be understood as an electromagnetic wave signal. The communication element 1111 can be an FRID chip to process the electrical signal and transmit the data information carried by the electrical signal to the communication terminal 2. To improve the stability of the connection interface between the communication element 1111 and the connecting wire 1112 and reduce the risk of damage during embedding, ultraviolet-cured polyurethane can be used to envelope and harden the area of the communication element 1111.

[0048] In some embodiments, the number of connection wires 1112 and induction elements 1113 is two. The two connection wires 1112 are arranged at intervals in the winding direction of the detection body 110. The communication element 1111 is located between the two connection wires 1112 and is electrically connected to the two connection wires 1112. The two induction elements 1113 are respectively located at one end of a connection wire 1112 away from the communication element 1111. The detection element 111 may include two connection wires 1112, two induction elements 1113 and a communication element 1111. The two connection wires 1112 are connected to both ends of the communication element 1111 in the winding direction. The winding direction can be understood as the direction in which the detection body 110 is spirally wound on the yarn body 120. The communication element 1111 can set an alternating electric field for the two connection wires 1112, so that the communication element 1111 can control the two connection wires 1112 to transmit a second electromagnetic signal to the communication terminal 2. The second electromagnetic signal can be understood as an electromagnetic wave signal. Thus, the function of wireless information transmission of the communication element 1111 can be realized through the connection wire 1112, and further the size of the communication element 1111 can be made smaller. The two induction elements 1113 are respectively located at one end of their corresponding connection wires 1112 away from the communication element 1111, so that the two induction elements 1113 are arranged at intervals on the detection element 111. Thus, one detection element 111 can simultaneously monitor the pressures at two different points in the winding direction, so as to increase the number of pressure monitoring points of the detection element 111 in the winding direction. In this embodiment, the end of the connection wire 1112 away from the communication element 1111 covers the induction element 1113 in the winding direction. Thus, on the premise that the size of the detection element 111 in the winding direction remains unchanged, the effective length of the connection wire 1112 is longer, so that the connection wire 1112 can generate enough induced current for the communication element 1111 to work. In addition, since the detection body 110 is wound on the yarn body 120, the connection wire 1112 also has a spiral structure, so that the connection wire 1112 can emit the second electromagnetic signal from different angles. Thus, the RF reader of the communication terminal 2 can receive the second electromagnetic signal at any angle with the papermaking felt 1, and the placement position of the RF reader has a high degree of freedom. The frequency at which the communication element 1111 controls the connection wire 1112 to emit the second electromagnetic signal can be in the range of 865 MHz to 925 MHz.

[0049] See Figure 7 and Figure 8 , Figure 7 is a relationship curve graph of the power and frequency of the second electromagnetic signal provided by the present application. Figure 8 is a relationship curve graph of the resonance frequency and strain of the second electromagnetic signal provided by the present application.

[0050] In this application, the working principle of using the sensing yarn 100 to monitor the deformation state of the papermaking felt 1 is as follows:

[0051] When the papermaking felt 1 is compressed or undergoes plastic deformation due to long-term use, the sensing yarn 100 deforms, squeezing the induction element 1113. Thus, after the communication terminal 2 transmits the first electromagnetic signal to the communication element 1111 of the papermaking felt 1 and powers the communication element 1111 through the connecting wire 1112, the communication element 1111 can receive the change in the electrical signal generated by the induction element 1113 due to the change in resistance. The communication element 1111 then transmits the data information carried by the electrical signal to the communication terminal 2 through the second electromagnetic signal (which can be understood as a backscattered electromagnetic wave signal). Furthermore, the communication terminal 2 can record the change curve of the power and frequency of the corresponding first electromagnetic signal, as Figure 7 shown. Furthermore, the communication terminal 2 can also extract the resonance frequency of the second electromagnetic signal and the strain magnitude of the papermaking felt 1, and establish a relationship diagram between the strain and the resonance frequency of the second electromagnetic signal, as Figure 8 shown. Finally, the dynamic acquisition and transmission of the pressure or strain data of the papermaking felt 1 are realized, so as to monitor the usage condition of the papermaking felt 1, and an early warning can be issued when the pressure or strain exceeds the preset value.

[0052] In some embodiments, the two connecting wires 1112, the communication element 1111, and the two induction elements 1113 are all embedded in the bearing matrix 112. The two connecting wires 1112, the two induction elements 1113, and the communication element 1111 are all embedded on the bearing matrix 112 to divide the detection element 111 into multiple sub-elements and disperse them on the bearing matrix 112. Furthermore, the thickness of the detection element 111 can be reduced, so that the sensing yarn 100 composed of the detection main body 110 and the yarn main body 120 is more uniform, more convenient for weaving, and the risk of inaccurate detection results of the detection main body 110 due to the large structure of the detection main body 110 is reduced. Specifically, the detection main body 110 can carry the two induction elements 1113, the two connecting wires 1112, and the communication element 1111 on the bearing matrix 112 in the order of induction element 1113 - connecting wire 1112 - communication element 1111 - connecting wire 1112 - induction element 1113 along the winding direction.

[0053] See Figure 9 , Figure 9 is Figure 6 a schematic structural diagram of an embodiment of the induction element shown.

[0054] In some embodiments, the sensing element 1113 includes a conductive filler 1114 and a flexible matrix 1115, and the conductive filler 1114 is uniformly distributed in the flexible matrix 1115. The sensing element 1113 includes a conductive filler 1114 and a flexible matrix 1115. The conductive filler 1114 is used for conducting electricity, and the flexible matrix 1115 is used for accommodating the conductive material, and the flexible matrix 1115 has the function of undergoing large deformations without breaking. The conductive filler 1114 is dispersed in the flexible matrix 1115 such that when the sensing element 1113 is subjected to pressure causing deformation of the sensing element 1113, the spacing distance between the conductive particles in the conductive filler 1114 changes due to the deformation, thereby causing a change in the resistance of the sensing element 1113. When the papermaking felt 1 is deformed by an external force or due to fatigue, the resistance of the sensing element 1113 changes accordingly, and the change in resistance can cause a change in the electrical signal received by the communication element 1111, so that the communication terminal 2 can monitor the force distribution of the papermaking felt 1, or the papermaking felt 1 itself is in an abnormal state such as fatigue, causing the sensing yarn 100 to be subjected to pressure and resulting in a change in the electrical signal, so that the communication terminal 2 can monitor the force distribution of the papermaking felt 1 in the abnormal state. Compared with using traditional varistors, the sensing element 1113 including the conductive filler 1114 and the flexible matrix 1115 is more suitable for use in an environment where the papermaking felt 1 undergoes repeated deformations, and has a smaller volume and a longer lifespan. The conductive filler 1114 may include one or more of materials such as graphene, carbon nanotubes, carbon black, metal nanoparticles, or metal nanowires. The flexible matrix 1115 may be one or more of materials such as polyurethane, polydimethylsiloxane, or hydrogel. Among them, the mass ratio of the conductive filler 1114 to the flexible matrix 1115 may be in the range of 0.1 - 0.3, and the mass ratio of the conductive filler 1114 to the flexible matrix 1115 may be 0.1, 0.2, 0.3, etc., or a range composed of any two of the above values, such as 0.1 - 0.2, 0.2 - 0.3, etc. In this embodiment, the conductive filler 1114 is carbon nanotubes, and the flexible matrix 1115 is polyurethane. Due to the high aspect ratio of carbon nanotubes, a three-dimensional conductive network can be formed in polyurethane, and a small deformation can cause the fracture or reorganization of the conductive network, resulting in a significant change in resistance and a high sensitivity of the sensing element 1113. Moreover, polyurethane has good mechanical properties and wear resistance, making the sensing element 1113 more durable in use.

[0055] In some embodiments, the sensing element 1113 and the carrier substrate 112 are flat, and the sensing element 1113 is disposed opposite to the carrier substrate 112. The carrier substrate 112 may be in the form of a thin film to make the detection body 110 fit more closely to the yarn body 120. The sensing element 1113 can be prepared by thoroughly mixing the conductive filler 1114 with the fluid flexible matrix 1115, and then coating the mixed fluid on one end of the connecting wire 1112 away from the communication element 1111. At the connection between the connecting wire 1112 and the sensing element 1113, the connecting wire 1112 is located between the sensing element 1113 and the carrier substrate 112. After the fluid dries, the sensing element 1113 can be formed. Further, the sensing element 1113 can be in full contact with the connecting wire 1112, the sensing element 1113 is disposed opposite to the carrier substrate 112, and is adhered to the connecting wire 1112 and the carrier substrate 112, finally making the sensing element 1113 flat, increasing the surface area of the sensing element 1113. When the sensing element 1113 is wound around the yarn body 120 through the detection body 110, the sensing element 1113 can be in full contact with the yarn body 120, thereby increasing the contact area of the sensing element 1113 and improving the sensitivity of the sensing element 1113. The size of the sensing element 1113 in the winding direction can be in the range of 0.5 cm to 2 cm, and the sensing element 1113 can have better sensitivity within the above range in the winding direction. The size of the sensing element 1113 in the winding direction can be 0.5 cm, 1 cm, 1.5 cm, 2 cm, etc., or a range composed of any two of the above values. For example, 0.5 cm to 1 cm, 1 cm to 1.5 cm, 1.5 cm to 2 cm, etc. In addition, the size of the detection element 111 in the winding direction does not exceed 10 cm, and the sensing element 1113 is disposed at both ends of the detection element 111. Therefore, the distance between the two sensing elements 1113 also does not exceed 10 cm, so that in the length direction of the papermaking felt 1, the sensing element 1113 has a suitable distribution density, and thus the force distribution on a certain area of the surface of the papermaking felt 1 can be effectively monitored.

[0056] Further, the number of the detection elements 111 is multiple, and the multiple detection elements 111 are spaced apart in the winding direction of the detection body 110 on the carrier substrate 112. The number of the detection elements 111 is multiple, and the multiple detection elements 111 are spaced apart from each other in the winding direction and are disposed on the carrier substrate 112, so that the detection elements 111 are evenly distributed on the papermaking felt 1 to simultaneously monitor the pressure distribution on the entire surface of the papermaking felt 1.

[0057] In some embodiments, the carrier substrate 112 extends in the winding direction of the detection body 110, and one side of the carrier substrate 112 facing away from the detection element 111 is attached to the outer sidewall of the braided yarn 200. The detection body 110 includes the detection element 111 and the carrier substrate 112. The detection body 110 relies on the carrier substrate 112 to wind the detection element 111 around the surface of the yarn body 120. The material of the carrier substrate 112 can be a film formed of polyimide material. The detection element 111 can be connected to one side surface of the carrier substrate 112, and the side surface of the carrier substrate 112 facing away from the detection element 111 is attached to and wound around the outer sidewall of the braided yarn 200, so that the detection element 111 is located on the side of the carrier substrate 112 facing away from the yarn body 120. Compared with fixing the detection element 111 between the carrier substrate 112 and the outer sidewall of the yarn body 120, the limitation on the deformation of the sensing element 1113 can be reduced, and further the range of resistance change of the sensing element 1113 can be increased, so that the sensing element 1113 is more sensitive.

[0058] In some embodiments, the radial dimensions of the braided yarn 200 and the sensing yarn 100 are the same. The braided yarn 200 and the sensing yarn 100 are woven with each other to form the monitoring bottom layer 10. The radial dimensions of the braided yarn 200 and the sensing yarn 100 can be the same, so that the surface of the monitoring bottom layer 10 has a high flatness, and the risk that some detection elements 111 in the monitoring bottom layer 10 are blocked due to the uneven surface of the monitoring bottom layer 10 can be reduced, and the accuracy of monitoring the pressure distribution of the papermaking felt 1 can be improved.

[0059] In summary, the papermaking felt 1 includes the detection element 111 and the carrier substrate 112. The detection element 111 is carried on the carrier substrate 112 to form the detection body 110. The detection element 111 is used to detect the force condition of the papermaking felt 1. The detection body 110 is wound around the yarn body 120 to form the sensing yarn 100. The sensing yarn 100 and the braided yarn 200 are woven with each other to form the monitoring bottom layer 10. The monitoring bottom layer 10 is connected between two outer surface layers 20 to form the papermaking felt 1, so that the sensing yarn 100 can detect the pressure caused by the fatigue of the papermaking felt 1 or the external pressure outside the papermaking felt 1.

[0060] The beneficial effects of the present application are further described below in conjunction with embodiments.

[0061] In order to make the technical problems, technical solutions and beneficial effects solved by the embodiments of the present application clearer, the following will be further described in detail in conjunction with the embodiments and the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present application and its application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0062] Embodiment 1

[0063] The papermaking felt includes a fiber layer, a monitoring base net layer, and outer surface layers on both sides of the monitoring base net layer. The diameter of the yarn in the fiber layer is up to 0.2 × 4 ply yarns, the warp and weft density is 93×118 per 10 cm. The yarns in the middle layer and on the side close to the roll surface are nylon monofilaments with a diameter of 0.4 mm, and the warp and weft densities are 78×95 and 100×80 respectively. The base net structure is 3 / 1 broken twill, the base net thickness is 4.7 mm, the areal density is 1550 g / m2, and the air permeability is 54 cfm.

[0064] Among them, the width of the sensing element is 2 mm, and the dimension in the winding direction is 1 cm. When the roll pressure of the papermaking felt is 0 - 10 MPa, the strain range of the papermaking felt is 0.5% - 10%, the response time is less than 10 ms, and the air permeability of the papermaking felt is greater than 200 L / m 2 ·s, and the papermaking equipment is connected to work for 500 h. The roll pressure refers to the pressure applied to roll the papermaking felt, the strain range refers to the range of the change in the amount of deformation when the papermaking felt is rolled, and the response time refers to the time when the papermaking felt per unit area is rolled.

[0065] Under the above conditions, the attenuation rate of the second electromagnetic signal of the papermaking felt is less than 5%. It shows that the change in the cumulative deformation of the papermaking felt before and after the test is less than 5%, which proves that by setting a monitoring base net layer in the papermaking felt, the pressure received by the papermaking felt can be effectively monitored, and then the abnormal states such as the fatigue degree and caking degree of the papermaking felt can be judged, reducing the risk that the quality of the paper manufactured due to the fatigue or caking of the papermaking felt becomes poor.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A papermaking felt, characterized in that, The papermaking felt includes a monitoring base net layer and two outer surface layers. The monitoring base net layer is sandwiched between the two outer surface layers. The monitoring base net layer includes sensing yarns and weaving yarns. The sensing yarns and the weaving yarns are woven with each other. The sensing yarns include yarn bodies and detection bodies wound around the yarn bodies. The detection bodies include bearing substrates and detection elements. The detection elements are carried on the bearing substrates. The detection elements are used for force monitoring of the papermaking felt.

2. The papermaking felt according to claim 1, wherein The detection elements include communication elements, connecting wires and induction elements. The communication elements are electrically connected to the induction elements through the connecting wires. The induction elements are used for sensing pressure.

3. The papermaking felt according to claim 2, wherein, The number of the connecting wires and the induction elements is two. The two connecting wires are spaced in the winding direction of the detection body. The communication element is located between the two connecting wires and is electrically connected to the two connecting wires. The two induction elements are respectively located at one end of one connecting wire away from the communication element.

4. The papermaking felt according to claim 1, characterized in that, The induction elements include conductive fillers and flexible substrates. The conductive fillers are uniformly distributed in the flexible substrates.

5. The papermaking felt according to claim 4, wherein The induction elements and the bearing substrates are flat-shaped. The induction elements are arranged opposite to the bearing substrates.

6. The papermaking felt according to claim 5, wherein, The bearing substrates extend in the winding direction of the detection body. The surface of the bearing substrates facing away from the detection elements is attached to the outer side walls of the weaving yarns.

7. The papermaking felt according to claim 3, characterized in that, The two connecting wires, the communication element and the two induction elements are all embedded in the bearing substrates.

8. The papermaking felt according to claim 1, wherein The number of the detection elements is multiple. The multiple detection elements are spaced in the winding direction of the detection body on the bearing substrates.

9. The papermaking felt according to claim 1, wherein The radial dimensions of the weaving yarns and the sensing yarns are the same.

10. A monitoring system, characterized in that, The monitoring system includes a communication terminal and the papermaking felt as claimed in claims 1 to 9. The communication terminal is used for wireless communication with the papermaking felt.

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