Permeability testing system and fiber object surface permeability testing method

Abstract

The invention discloses a permeability testing system and a fiber object surface permeability testing method, and relates to the technical field of composite material liquid forming. The permeability testing system comprises a liquid storage tank, an in-plane permeability testing module, a thickness-direction permeability testing module and a first reversing valve; the fiber object surface permeability testing method comprises the following steps: acquiring a current permeability testing type; when the in-plane permeability is tested, the first reversing valve is adjusted to a first preset gear; on the basis of an in-plane permeability testing module, the pressure value of a liquid inlet of the in-plane permeability testing module and the flow peak position of the testing liquid are obtained in real time, and the in-plane permeability of the fiber object plane is calculated; when the thickness-direction permeability is tested, the first reversing valve is adjusted to a second preset gear; on the basis of the thickness-direction permeability testing module, pressure values of a liquid inlet and a liquid outlet of the thickness-direction permeability testing module are obtained in real time, the flow of liquid is tested, and the thickness-direction permeability of the fiber object surface is calculated. According to the invention, the flexibility and accuracy of permeability testing are improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of composite material liquid forming, in particular to a permeability testing system and a fiber surface permeability testing method. BACKGROUND

[0002] In the composite material liquid forming process, the permeability of the fiber surface is characterized by in-plane permeability and thickness permeability. Permeability data is the core input for simulating resin flow front, optimizing mold injection scheme and process parameters, and directly determines whether the forming process produces defects such as dry spots and air holes. Accurate permeability testing helps to improve forming quality and production efficiency.

[0003] The permeability testing method in the prior art mainly relies on a single way to measure in-plane permeability and thickness permeability, for example, by pressure measurement and flow measurement to calculate in-plane permeability and thickness permeability. However, the single way of measuring in-plane permeability and thickness testing rate is not specific enough, and it is difficult to adapt to the diversified needs of different permeability testing types. At the same time, the single way of measuring in-plane permeability and thickness testing rate is prone to unstable test results and low accuracy, which is difficult to meet the high-precision and rapid feedback requirements of permeability testing in industrial production. SUMMARY

[0004] The present application provides a permeability testing system and a fiber surface permeability testing method, which realizes in-plane permeability and thickness permeability testing in a double measurement mode by independently setting in-plane permeability testing module and thickness permeability testing module, and improves the flexibility and accuracy of permeability testing.

[0005] The first aspect of the present application provides a fiber surface permeability testing method based on a permeability testing system, the permeability testing system comprising a liquid storage tank, an in-plane permeability testing module, a thickness permeability testing module, and a first reversing valve; the in-plane permeability testing module comprises an in-plane liquid inlet and an in-plane liquid outlet; the thickness permeability testing module comprises a thickness liquid inlet and a thickness liquid outlet; the liquid outlet of the liquid storage tank is in communication with the first end of the first reversing valve, the second end of the first reversing valve is in communication with the in-plane liquid inlet, and the third end of the first reversing valve is in communication with the thickness liquid inlet; the liquid storage tank is used to provide test liquid for the in-plane permeability testing module or the thickness permeability testing module; the fiber surface permeability testing method comprises:

[0006] obtaining a current permeability testing type; the permeability testing type includes in-plane permeability testing and thickness permeability testing;

[0007] when the current permeability test type is the in-plane permeability test, adjusting the first switching valve to a first preset gear position, so that the test liquid flows into the in-plane permeability test module through the first switching valve; based on the in-plane permeability test module, the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid are obtained in real time; according to the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid, the in-plane permeability of the fiber surface is calculated;

[0008] when the current permeability test type is the in-plane permeability test, adjusting the first switching valve to a first preset gear position, so that the test liquid flows into the in-plane permeability test module through the first switching valve; based on the in-plane permeability test module, the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid are obtained in real time; according to the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid, the in-plane permeability of the fiber surface is calculated;

[0009] Optionally, the permeability test system further comprises a constant flow valve; the liquid outlet of the liquid storage tank is communicated with the first end of the first switching valve through the constant flow valve; the gas inlet of the liquid storage tank is communicated with a compressed air end, and the liquid storage tank further comprises a pressure valve; the fiber surface permeability test method further comprises:

[0010] obtaining a current permeability test glue injection mode; the permeability test glue injection mode comprises constant pressure glue injection and constant flow glue injection;

[0011] when the current permeability test glue injection mode is the constant pressure glue injection, controlling the constant flow valve to be closed, and controlling the liquid storage tank to provide the test liquid to the in-plane permeability test module or the thickness permeability test module at a constant injection pressure through the pressure valve;

[0012] when the current permeability test glue injection mode is the constant flow glue injection, controlling the constant flow valve to be opened, so that the test liquid flows into the in-plane permeability test module or the thickness permeability test module at a constant injection flow rate.

[0013] Optionally, the permeability test system further comprises a recovery tank and a second switching valve; the in-plane liquid outlet is communicated with the first end of the second switching valve, the thickness liquid outlet is communicated with the second end of the second switching valve, and the third end of the second switching valve is communicated with the liquid inlet of the recovery tank; the fiber surface permeability test method further comprises:

[0014] when the current permeability test type is the in-plane permeability test, adjusting the second switching valve to a first preset gear position, so that the test liquid flows into the recovery tank through the second switching valve;

[0015] In the current permeability test injection mode is the constant flow injection, the second reversing valve is adjusted to the second preset gear, so that the test liquid flows into the recovery tank through the second reversing valve.

[0016] Optionally, the in-plane permeability test module further comprises an upper mold, a lower mold, a gasket, a camera unit, and a first pressure test valve; the upper mold and the lower mold are used to fix the fiber surface on the gasket; the upper mold comprises a hollow structure, and a transparent cover plate is arranged in the hollow structure; the camera unit is arranged on the side of the upper mold away from the gasket; the first pressure test valve is arranged at the in-plane liquid inlet;

[0017] Based on the in-plane permeability test module, the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid are obtained in real time, comprising:

[0018] During the flow of the test liquid on the surface of the fiber surface, based on the first pressure test valve, the pressure value of the in-plane liquid inlet at each time is obtained;

[0019] During the flow of the test liquid on the surface of the fiber surface, based on the image captured by the camera unit, the flow peak position of the test liquid at each time is obtained.

[0020] Optionally, according to the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid, the in-plane permeability of the fiber surface is calculated, comprising:

[0021] The viscosity of the test liquid and the volume fraction of the fiber surface are obtained;

[0022] According to the pressure value of the in-plane liquid inlet at each time, the average pressure drop value of the in-plane liquid inlet during the flow of the test liquid is calculated;

[0023] According to the flow peak position of the test liquid at each time, the proportion value of the square of the flow peak position of the test liquid changing with time during the flow of the test liquid is calculated;

[0024] According to the flow peak position of the test liquid at each time, the viscosity of the test liquid, the volume fraction of the fiber surface, and the average pressure drop value of the in-plane liquid inlet, the in-plane permeability of the fiber surface is calculated based on the first calculation formula; the first calculation formula is:

[0025] ;

[0026] Wherein, is the in-plane permeability, a proportional value of a square of a flow peak position of the test liquid with respect to time, an average pressure drop value of the in-plane liquid inlet, a volume fraction of the fibrous surface, a viscosity of the test liquid.

[0027] Optionally, the thickness permeability test module comprises an upper support sleeve, a lower support sleeve, an upper porous plate, a lower porous plate, a second pressure test valve, a third pressure test valve, and a flow meter; the upper support sleeve and the lower support sleeve are used to fix the fibrous surface between the upper porous plate and the lower porous plate; the second pressure test valve and the flow meter are arranged at the thickness liquid inlet; the third pressure test valve is arranged at the thickness liquid outlet;

[0028] Based on the thickness permeability test module, the pressure value of the thickness liquid inlet, the pressure value of the thickness liquid outlet, and the flow of the test liquid are acquired in real time, comprising:

[0029] During the flow process of the test liquid through the lower porous plate, the fibrous surface, and the upper porous plate in sequence, the pressure value of the thickness liquid inlet is acquired in real time based on the second pressure test valve;

[0030] During the flow process of the test liquid through the lower porous plate, the fibrous surface, and the upper porous plate in sequence, the pressure value of the thickness liquid outlet is acquired in real time based on the third pressure test valve;

[0031] During the flow process of the test liquid through the lower porous plate, the fibrous surface, and the upper porous plate in sequence, the flow of the test liquid is acquired in real time based on the flow meter.

[0032] Optionally, the thickness permeability of the fibrous surface is calculated according to the pressure value of the thickness liquid inlet, the pressure value of the thickness liquid outlet, and the flow of the test liquid, comprising:

[0033] The flow area of the test liquid is acquired according to the upper porous plate and the lower porous plate;

[0034] The viscosity of the test liquid and the thickness of the fibrous surface are acquired;

[0035] The thickness inlet and outlet pressure difference value is calculated according to the pressure value of the thickness liquid inlet and the pressure value of the thickness liquid outlet;

[0036] According to the flow rate of the test liquid, the flow area of the test liquid, the viscosity of the test liquid, the thickness of the fibrous surface, and the thickness-direction in-out liquid pressure difference value, a thickness-direction permeability of the fibrous surface is calculated based on a second calculation formula:

[0037] ;

[0038] wherein, is the thickness-direction permeability of the fibrous surface, is the flow rate of the test liquid, is the flow area of the test liquid, is the thickness of the fibrous surface, is the thickness-direction in-out liquid pressure difference value, is the viscosity of the test liquid.

[0039] Optionally, the liquid storage tank further comprises a first temperature control unit, the in-plane permeability test module further comprises a second temperature control unit, and the thickness-direction permeability test module further comprises a third temperature control unit; the fibrous surface permeability test method further comprises:

[0040] when the current permeability test type is the in-plane permeability test, the first temperature control unit and the second temperature control unit are controlled to adjust the liquid storage tank and the in-plane permeability test module to a first preset temperature, respectively;

[0041] when the current permeability test injection mode is the constant flow injection, the first temperature control unit and the third temperature control unit are controlled to adjust the liquid storage tank and the thickness-direction permeability test module to a second preset temperature, respectively.

[0042] The second aspect of the present application provides a permeability test system, which comprises a liquid storage tank, an in-plane permeability test module, a thickness-direction permeability test module, a first reversing valve, and a controller.

[0043] The in-plane permeability test module comprises an in-plane liquid inlet and an in-plane liquid outlet; the thickness-direction permeability test module comprises a thickness-direction liquid inlet and a thickness-direction liquid outlet.

[0044] The liquid outlet of the liquid storage tank is in communication with the first end of the first reversing valve, the second end of the first reversing valve is in communication with the in-plane liquid inlet, and the third end of the first reversing valve is in communication with the thickness-direction liquid inlet.

[0045] The liquid storage tank is used to provide test liquid for the in-plane permeability test module or the thickness-direction permeability test module.

[0046] The controller is connected with the in-plane permeability test module, the thickness permeability test module and the first reversing valve respectively, and is used for executing the fiber surface permeability test method based on the permeability test system as described above.

[0047] Optionally, the permeability test system further comprises a constant flow valve.

[0048] The liquid outlet of the liquid storage tank is communicated with the first end of the first reversing valve through the constant flow valve.

[0049] The gas inlet of the liquid storage tank is communicated with a compressed air end, and the liquid storage tank further comprises a pressure valve.

[0050] The controller is further connected with the constant flow valve and the pressure valve respectively, and is further used for controlling the working state of the constant flow valve and / or the pressure valve according to the current permeability test glue injection mode.

[0051] The technical scheme of the present application can perform in-plane permeability test or thickness permeability test based on the in-plane permeability test module or the thickness permeability test module as needed by acquiring the current permeability test type. When the current permeability test type is in-plane permeability test, the first reversing valve is adjusted to the first preset gear, so that the test liquid can flow into the in-plane permeability test module through the first reversing valve, and the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid can be acquired in real time based on the in-plane permeability test module. Therefore, the in-plane permeability of the fiber surface can be calculated according to the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid. When the current permeability test type is thickness permeability test, the first reversing valve is adjusted to the second preset gear, so that the test liquid can flow into the thickness permeability test module through the first reversing valve, and the pressure value of the thickness liquid inlet, the pressure value of the thickness liquid outlet and the flow of the test liquid can be acquired in real time based on the thickness permeability test module. Therefore, the thickness permeability of the fiber surface can be calculated according to the pressure value of the thickness liquid inlet, the pressure value of the thickness liquid outlet and the flow of the test liquid. By dynamically adjusting the gear of the first reversing valve, the permeability test system can flexibly adapt to different permeability test requirements, realize permeability test by using the corresponding test method based on the current permeability test type, improve the accuracy and efficiency of permeability test, and provide strong technical support for the optimization and quality control of the liquid forming process of composite materials.

[0052] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0054] Figure 1 is a structural schematic diagram of a permeability test system provided by an embodiment of the present application;

[0055] Figure 2 is a flow schematic diagram of a fiber surface permeability test method based on a permeability test system provided by an embodiment of the present application;

[0056] Figure 3 is a flow schematic diagram of a fiber surface permeability test method based on a permeability test system provided by an embodiment of the present application;

[0057] Figure 4 is a flow schematic diagram of a fiber surface permeability test method based on a permeability test system provided by an embodiment of the present application;

[0058] Figure 5 is a flow schematic diagram of a fiber surface permeability test method based on a permeability test system provided by an embodiment of the present application;

[0059] Figure 6 is a flow schematic diagram of a fiber surface permeability test method based on a permeability test system provided by an embodiment of the present application. DETAILED DESCRIPTION

[0060] In order to make the person skilled in the art better understand the present application, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort should belong to the scope of protection of the present application.

[0061] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, unless the context clearly indicates otherwise. It will be further understood that the use of relational terms such as first and second, and the like are used solely to distinguish one from another entity without necessarily implying a relationship or order between such entities. Much of the detail of the embodiments described in this detailed description is conventional or well understood in the art and is not described in detail to avoid obscuring the description of the embodiments of the application. Moreover, the terminology used in the description is for the purpose of describing the particular versions or embodiments only and is not intended to be limiting, as the scope of the application will be limited only by the appended claims.

[0062] Embodiment One

[0063] Figure 1 is a structural schematic diagram of a permeability testing system provided by Embodiment One of the application, as shown in Figure 1 The permeability testing system comprises a liquid storage tank 1, an in-plane permeability testing module 2, a thickness-direction permeability testing module 3, a first reversing valve 4, and a controller 5. The in-plane permeability testing module 2 comprises an in-plane liquid inlet 21 and an in-plane liquid outlet 22. The thickness-direction permeability testing module 3 comprises a thickness-direction liquid inlet 31 and a thickness-direction liquid outlet 32. The liquid outlet 11 of the liquid storage tank 1 is in communication with the first end 41 of the first reversing valve 4. The second end 42 of the first reversing valve 4 is in communication with the in-plane liquid inlet 21. The third end 43 of the first reversing valve 4 is in communication with the thickness-direction liquid inlet 31. The liquid storage tank 1 is configured to provide testing liquid for the in-plane permeability testing module 2 or the thickness-direction permeability testing module 3. The controller 5 is connected to the in-plane permeability testing module 2, the thickness-direction permeability testing module 3, and the first reversing valve 4, respectively.

[0064] The liquid storage tank 1 is configured to store testing liquid, which can be resin for example, so as to directly reflect the actual use medium in the liquid molding process of the composite material. The in-plane permeability testing module 2 comprises the in-plane liquid inlet 21 and the in-plane liquid outlet 22. The thickness-direction permeability testing module 3 comprises the thickness-direction liquid inlet 31 and the thickness-direction liquid outlet 32. The liquid outlet 11 of the liquid storage tank 1 is in communication with the first end 41 of the first reversing valve 4. The second end 42 of the first reversing valve 4 is in communication with the in-plane liquid inlet 21. The third end 43 of the first reversing valve 4 is in communication with the thickness-direction liquid inlet 31. In this way, the liquid storage tank 1 can provide testing liquid for the in-plane permeability testing module 2 through the liquid outlet 11, the first end 41, the second end 42, and the in-plane liquid inlet 21 in sequence, and provide testing liquid for the thickness-direction permeability testing module 3 through the liquid outlet 11, the first end 41, the third end 43, and the thickness-direction liquid inlet 31 in sequence. Thus, the in-plane permeability testing module 2 can be used to perform in-plane permeability testing, and the thickness-direction permeability testing module 3 can be used to perform thickness-direction permeability testing.

[0065] Specifically, the in-plane permeability test module 2 can support the flow of the test liquid on the surface of the fibrous object, and the thickness permeability test module 3 can support the vertical permeation of the test liquid through the fibrous object, so as to realize accurate measurement of the in-plane permeability and the thickness permeability. The fibrous object can be specifically understood as a dry fibrous preform, which is a base material in a liquid molding process of a composite material, so as to be able to use the fibrous object as a sample for resin permeation in the permeability test. The in-plane permeability can be specifically understood as the permeation ability of the resin in the plane direction of the fibrous object, and the in-plane permeability reflects the flow resistance of the resin along the fibrous object. A higher in-plane permeability is suitable for filling a large-area component, but the in-plane permeability needs to be controlled to avoid defects caused by too fast flow. The thickness permeability can be specifically understood as the permeation ability of the resin in the thickness direction of the fibrous object, and the thickness permeability is used to measure the resistance of the resin to pass through the fibrous layer. A higher thickness permeability is suitable for thick-section components, but a too high thickness permeability can cause air holes or uneven filling. The in-plane permeability test and the thickness permeability test of the fibrous object can guide the mold design and process optimization of the composite material molding process, so as to prevent defects such as dry spots or air holes in the composite material molding process.

[0066] It can also be understood that by adjusting the gear position of the first reversing valve 4, the flow direction of the test liquid can be switched, so that the test liquid provided by the liquid storage tank 1 can flow into the in-plane permeability test module 2 or the thickness permeability test module 3, thereby realizing quick switching of the permeability test type and improving the flexibility of the permeability test.

[0067] Optionally, with reference to Figure 1 , the permeability test system further comprises a constant flow valve 61; the liquid outlet 11 of the liquid storage tank 1 is communicated with the first end 41 of the first reversing valve 4 through the constant flow valve 61; the gas inlet 12 of the liquid storage tank 1 is communicated with the compressed air end, and the liquid storage tank 1 further comprises a pressure valve 62.

[0068] Specifically, the injection mode of the permeability test can include a constant flow injection mode and a constant pressure injection mode. The constant flow injection mode can ensure accurate control of the test liquid flow and good data repeatability, and is suitable for low permeability test scenarios. The constant pressure injection mode can ensure stable pressure difference and accelerate the test liquid permeation speed, and is suitable for high permeability test scenarios. The constant flow valve 61 is arranged between the liquid outlet 11 of the liquid storage tank 1 and the first end 41 of the first switching valve 4, so that the constant flow injection mode can be realized through the constant flow valve 61. The constant flow valve 61 is specifically used for accurately controlling the flow of the test liquid, so as to control the test liquid to be injected into the in-plane permeability test module 2 or the thickness permeability test module 3 at a constant flow rate. At the same time, the gas inlet 12 of the liquid storage tank 1 is in communication with the compressed air end, and the liquid storage tank 1 further comprises a pressure valve 62, so that the constant pressure injection mode can be realized through the pressure valve 62. The pressure valve 62 is specifically used for controlling the air pressure in the liquid storage tank 1, so as to keep the inside of the liquid storage tank 1 at a constant pressure, thereby enabling the test liquid to be stably injected into the in-plane permeability test module 2 or the thickness permeability test module 3 in a constant pressure mode.

[0069] Optionally, with reference back to Figure 1 , the permeability test system further comprises a recovery tank 7 and a second switching valve 8. The in-plane liquid outlet 21 is in communication with the first end 81 of the second switching valve 8, the thickness liquid outlet 32 is in communication with the second end 82 of the second switching valve 8, and the third end 83 of the second switching valve 8 is in communication with the liquid inlet 71 of the recovery tank 7.

[0070] The recovery tank 7 is specifically used for collecting and storing the test liquid discharged from the in-plane permeability test module 2 or the thickness permeability test module 3 during the test. After the test liquid is collected and recovered by the recovery tank 7, it can be reused or conveniently disposed of, thereby avoiding waste and pollution caused by direct discharge of the test liquid. Specifically, the in-plane liquid outlet 22 is in communication with the first end 81 of the second switching valve 8, the thickness liquid outlet 32 is in communication with the second end 82 of the second switching valve 8, and the third end 83 of the second switching valve 8 is in communication with the liquid inlet 71 of the recovery tank 7, so that the flow direction of the test liquid can be switched by adjusting the gear position of the second switching valve 8, thereby realizing quick switching of the flow direction of the test liquid under different test rate test types and ensuring uniform recovery of the test liquid under different test rate test types.

[0071] Optionally, with reference back to Figure 1 , the in-plane permeability test module 2 further comprises an upper mold 23, a lower mold 24, a gasket 25, a camera unit 26, and a first pressure test valve 27. The upper mold 23 and the lower mold 24 are used to fix the fiber surface on the gasket 25. The upper mold 23 comprises a hollow structure 201, and a transparent cover plate 202 is arranged in the hollow structure 201. The camera unit 26 is arranged on the side of the upper mold 23 away from the gasket 25. The first pressure test valve 27 is arranged at the in-plane liquid inlet 21.

[0072] Specifically, the upper die 23 and the lower die 24 of the in-plane permeability testing module 2 can be adjusted in position by an electric sliding group, and the gasket 25 is arranged between the upper die 23 and the lower die 24, so that the fiber material surface can be fixed on the gasket 25 by the upper die 23 and the lower die 24, thereby enabling the in-plane permeability testing module 2 to support the flow of the test liquid on the surface of the fiber material. The first pressure testing valve 27 is arranged at the in-plane liquid inlet 21, so that the pressure value of the in-plane liquid inlet 21 during the flow of the test liquid can be obtained through the first pressure testing valve 27. The upper die 23 comprises a hollow structure 201, and a transparent cover plate 202 is arranged in the hollow structure 201. The camera unit 26 is arranged on the side of the upper die 23 away from the gasket 25, so that the real-time image of the flow of the test liquid on the surface of the fiber material can be captured by the camera unit 26, and the flow peak position of the test liquid at each moment can be obtained. Thus, the permeability testing system can accurately calculate the in-plane permeability of the fiber material based on the pressure value of the in-plane liquid inlet 21 and the flow peak position of the test liquid obtained by the in-plane permeability testing module 2.

[0073] Optionally, with reference back to Figure 1 , the thickness permeability testing module 3 comprises an upper support sleeve 33, a lower support sleeve 34, an upper porous plate 35, a lower porous plate 36, a second pressure testing valve 37, a third pressure testing valve 37, and a flow meter 38; the upper support sleeve 33 and the lower support sleeve 34 are used to fix the fiber material surface between the upper porous plate 35 and the lower porous plate 36; the second pressure testing valve 37 and the flow meter 38 are both arranged at the thickness liquid inlet 31; and the third pressure testing valve 39 is arranged at the thickness liquid outlet 32.

[0074] Specifically, the upper support sleeve 33, the upper porous plate 35, the lower porous plate 36, and the lower support sleeve 34 are sequentially arranged from top to bottom in the thickness permeability testing module 3, so that the fiber material surface can be fixed between the upper porous plate 35 and the lower porous plate 36 by the upper support sleeve 33 and the lower support sleeve 34, thereby enabling the thickness permeability testing module 3 to support the vertical permeation of the test liquid through the fiber material surface. The second pressure testing valve 37 and the flow meter 38 are both arranged at the thickness liquid inlet 31, and the third pressure testing valve 39 is arranged at the thickness liquid outlet 32, so that the pressure value of the thickness liquid inlet 31 during the permeation of the test liquid obtained by the second pressure testing valve 37 and the pressure value of the thickness liquid outlet 32 during the permeation of the test liquid obtained by the third pressure testing valve 39 can be used to determine the thickness liquid inlet and outlet pressure difference, and the flow of the test liquid during the permeation of the test liquid can be obtained by the flow meter 38. Thus, the permeability testing system can accurately calculate the thickness permeability of the fiber material based on the thickness liquid inlet and outlet pressure difference and the flow of the test liquid obtained by the thickness permeability testing module 3.

[0075] Optionally, with reference back toFigure 1 The liquid storage tank 1 further comprises a first temperature control unit 91, the in-plane permeability test module 2 further comprises a second temperature control unit 92, and the thickness permeability test module 3 further comprises a third temperature control unit 93.

[0076] The first temperature control unit 91, the second temperature control unit 92, and the third temperature control unit 93 can be heating plate structures, and can be attached to the outer surfaces of the liquid storage tank 1, the in-plane permeability test module 2, and the thickness permeability test module 3, respectively, so that the liquid storage tank 1, the in-plane permeability test module 2, and the thickness permeability test module 3 can be respectively temperature-regulated by the first temperature control unit 91, the second temperature control unit 92, and the third temperature control unit 93. By providing the first temperature control unit 91, the second temperature control unit 92, and the third temperature control unit 93, the temperature consistency between the liquid storage tank 1 and each test module can be ensured, and the permeability test system can be enabled to perform permeability tests under different temperature conditions.

[0077] The controller 5 can include a microprocessor, such as a central processing unit (CPU), and can further include other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The controller 5 can be controlled by an upper computer, so that an operator can remotely control the permeability test type and the permeability test glue injection mode of the permeability test system, thereby achieving flexibility and automation of the permeability test process. It can also be understood that the controller 5 in the permeability test system can be connected to the in-plane permeability test module 2, the thickness permeability test module 3, the first reversing valve 4, the constant flow valve 61, the pressure valve 62, the camera unit 26, the first pressure test valve 27, the second pressure test valve 37, the flow meter 38, the third pressure test valve 39, the first temperature control unit 91, the second temperature control unit 92, and the third temperature control unit 93, respectively. The controller 5 can execute the fiber surface permeability test method based on the permeability test system provided in the embodiments, has the corresponding function modules and beneficial effects of the execution method, and the technical details not described in detail in the embodiments can be referred to the fiber surface permeability test method based on the permeability test system described in the embodiments below.

[0078] Embodiment Two

[0079] Figure 2is a flowchart of a fiber surface permeability test method based on a permeability test system provided by Embodiment Two of the present application. The present embodiment can realize fiber surface permeability test based on the permeability test system of the above-mentioned embodiments. The method can be executed by a fiber surface permeability test device based on a permeability test system. The device can be realized by software and / or hardware, and can generally be integrated in the controller of the permeability test system. Accordingly, as shown in Figure 2 the fiber surface permeability test method based on a permeability test system can include:

[0080] S101, obtain the current permeability test type.

[0081] The permeability test type includes in-plane permeability test and thickness-direction permeability test.

[0082] Specifically, the controller can obtain the current permeability test type set by the operator through the upper computer, so as to adjust the gear of the first reversing valve according to the in-plane permeability test type or the thickness-direction permeability test type selected by the operator, thereby laying a foundation for subsequent in-plane permeability test or thickness-direction permeability test based on the in-plane permeability test module or the thickness-direction permeability test module as needed, and improving the flexibility of permeability test.

[0083] It can also be understood that the in-plane permeability reflects the flow resistance of the test liquid along the fiber surface. Higher in-plane permeability is suitable for filling large-area components, but the in-plane permeability needs to be controlled to avoid defects caused by too fast flow. The thickness-direction permeability can be specifically understood as the permeability of the test liquid along the thickness direction of the fiber surface. The thickness-direction permeability is used to measure the resistance of the resin passing through the fiber layer. Higher thickness-direction permeability is suitable for thick-section components, but too high thickness-direction permeability may cause air holes or uneven filling. In addition, the in-plane permeability can be represented by By respectively testing the in-plane permeability of the fiber surface along 0°, 45°, and 90° directions , the maximum in-plane permeability and the minimum in-plane permeability of the fiber surface can be determined. The thickness-direction permeability can be represented by The thickness-direction permeability is coincident with the thickness direction of the fiber surface.

[0084] The in-plane permeability test and the thickness-direction permeability test of the fiber surface can guide the mold design and process optimization of the composite material forming process to prevent defects such as dry spots or air holes in the composite material forming process.

[0085] S102, when the current permeability test type is the in-plane permeability test, adjusting the first reversing valve to a first preset gear position, so that the test liquid flows into the in-plane permeability test module through the first reversing valve; based on the in-plane permeability test module, the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid are obtained in real time; and according to the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid, the in-plane permeability of the fiber surface is calculated.

[0086] Specifically, when the controller determines that the current permeability test type is the in-plane permeability test through the upper computer, the first reversing valve is adjusted to the first preset gear position, so that the liquid outlet of the liquid storage tank is communicated with the in-plane liquid inlet of the in-plane permeability test module through the first reversing valve, so that the test liquid can flow into the in-plane permeability test module through the first reversing valve, thereby laying a foundation for realizing the in-plane permeability test based on the in-plane permeability test module.

[0087] After adjusting the first reversing valve to the first preset gear position, the controller can obtain the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid in real time based on the in-plane permeability test module, so that the controller can calculate the in-plane permeability of the fiber surface according to the change of the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid at each moment during the flow of the test liquid on the surface of the fiber surface in the in-plane permeability test module. It can be understood that the change of the pressure value of the in-plane liquid inlet reflects the flow resistance of the test liquid in the fiber surface, the greater the change of the pressure value of the in-plane liquid inlet, the weaker the permeability of the test liquid, and the in-plane permeability decreases accordingly; the change of the flow peak position of the test liquid with time reflects the permeation speed of the test liquid in the plane direction, the faster the flow peak position moves, the higher the in-plane permeability. By monitoring the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid in real time, the permeability test system can dynamically evaluate the flow characteristics of the test liquid on the surface of the fiber surface and accurately calculate the in-plane permeability of the fiber surface.

[0088] S103, when the current permeability test type is the in-plane permeability test, adjusting the first reversing valve to a first preset gear position, so that the test liquid flows into the in-plane permeability test module through the first reversing valve; based on the in-plane permeability test module, the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid are obtained in real time; and according to the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid, the in-plane permeability of the fiber surface is calculated.

[0089] Specifically, when the controller determines that the current permeability test type is the thick direction permeability test through the host computer, the first switching valve is adjusted to the second preset gear position, so that the liquid outlet of the liquid storage tank is communicated with the thick direction liquid inlet of the thick direction permeability test module through the first switching valve, so that the test liquid can flow into the thick direction permeability test module through the first switching valve, and the foundation for realizing the thick direction permeability test based on the thick direction permeability test module is laid.

[0090] After adjusting the first switching valve to the second preset gear position, the controller can obtain the pressure value of the thick direction liquid inlet, the pressure value of the thick direction liquid outlet, and the flow of the test liquid based on the thick direction permeability test module in real time, so that the controller can calculate the thick direction permeability of the fiber surface according to the pressure difference between the thick direction liquid inlet and the thick direction liquid outlet and the flow of the test liquid in the process of the test liquid penetrating the fiber surface vertically. It can be understood that a larger pressure difference between the thick direction liquid inlet and the thick direction liquid outlet may cause the fiber surface to deform under pressure, resulting in a decrease in the thick direction permeability; the flow of the test liquid reflects the permeability of the fiber surface in the vertical direction, and a larger flow of the test liquid indicates a higher porosity and a higher thick direction permeability of the fiber surface. By obtaining the pressure value of the thick direction liquid inlet, the pressure value of the thick direction liquid outlet, and the flow of the test liquid in real time, the permeability test system can dynamically evaluate the permeation characteristics of the test liquid penetrating the fiber surface vertically and accurately calculate the thick direction permeability of the fiber surface.

[0091] By dynamically adjusting the first switching valve to the first preset gear position or the second preset gear position based on the current permeability test type, the flow direction of the test liquid to the in-plane permeability test module or the thick direction permeability test module is controlled, so that the permeability test system can flexibly adapt to different permeability test requirements, and the in-plane permeability test of the fiber surface is performed using the in-plane permeability test module, and the thick direction permeability test of the fiber surface is performed using the thick direction permeability test module. Compared with the traditional single measurement method, the permeability test system realizes permeability test based on the current permeability test type by modular design, uses the corresponding test method for permeability test, improves the accuracy and efficiency of permeability test, and provides strong technical support for optimization and quality control of liquid forming process of composite materials.

[0092] In the embodiment, the in-plane permeability test or the thickness permeability test can be performed based on the in-plane permeability test module or the thickness permeability test module as needed by obtaining the current permeability test type. When the current permeability test type is the in-plane permeability test, the first reversing valve is adjusted to the first preset gear, so that the test liquid can flow into the in-plane permeability test module through the first reversing valve, and the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid can be obtained in real time based on the in-plane permeability test module. Therefore, the in-plane permeability of the fiber surface can be calculated according to the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid. When the current permeability test type is the thickness permeability test, the first reversing valve is adjusted to the second preset gear, so that the test liquid can flow into the thickness permeability test module through the first reversing valve, and the pressure value of the thickness liquid inlet, the pressure value of the thickness liquid outlet, and the flow of the test liquid can be obtained in real time based on the thickness permeability test module. Therefore, the thickness permeability of the fiber surface can be calculated according to the pressure value of the thickness liquid inlet, the pressure value of the thickness liquid outlet, and the flow of the test liquid. By dynamically adjusting the gear of the first reversing valve, the permeability test system can flexibly adapt to different permeability test requirements, realize permeability test based on the current permeability test type by using the corresponding test method, improve the accuracy and efficiency of the permeability test, and provide strong technical support for the optimization and quality control of the liquid forming process of the composite material.

[0093] Embodiment three

[0094] Figure 3 is a flowchart of a fiber surface permeability test method based on a permeability test system provided by the third embodiment of the present application. Based on the above-mentioned embodiments, the fiber surface permeability test method is supplemented, and accordingly, as shown in Figure 3 the fiber surface permeability test method based on the permeability test system of the present embodiment can include:

[0095] S201, obtaining a current permeability test glue injection mode.

[0096] The permeability test glue injection mode includes constant pressure glue injection and constant flow glue injection.

[0097] Specifically, the controller can also obtain the current permeability test glue injection mode set by the operator through the upper computer, so as to adjust the working state of the constant flow valve and / or the pressure valve according to the constant pressure glue injection mode or the constant flow glue injection mode selected by the operator, thereby laying a foundation for subsequent permeability test by using the constant pressure glue injection mode or the constant flow glue injection mode as needed, and improving the flexibility of the permeability test.

[0098] It can also be understood that the constant flow injection method can ensure accurate control of test liquid flow and good data repeatability, and is suitable for low permeability test scenarios; the constant pressure injection method can ensure stable pressure difference and accelerate the permeation speed of the test liquid, and is suitable for high permeability test scenarios.

[0099] S202, when the current injection method for permeability test is constant pressure injection, the constant flow valve is closed, and the liquid tank is controlled by the pressure valve to provide the test liquid to the in-plane permeability test module or the thickness permeability test module at a constant injection pressure.

[0100] Specifically, when the controller determines through the upper computer that the current injection method for permeability test is constant pressure injection, the constant flow valve is closed to ensure that the flow of the test liquid is no longer controlled by the constant flow valve, but completely relies on pressure regulation. At the same time, the external compressed air pressurizes the liquid tank through the metal hose, and the controller can also accurately control the injection pressure of the liquid tank through the pressure valve, so that the liquid tank can provide the test liquid to the in-plane permeability test module or the thickness permeability test module according to the current permeability test type at a preset constant injection pressure. Thus, the permeability test under the constant pressure injection method can be realized, and the permeability test system can simulate different application scenarios of the liquid forming process.

[0101] S203, when the current injection method for permeability test is constant flow injection, the constant flow valve is opened to make the test liquid flow into the in-plane permeability test module or the thickness permeability test module at a constant injection flow rate.

[0102] Specifically, when the controller determines through the upper computer that the current injection method for permeability test is constant flow injection, the constant flow valve is opened to be able to adjust the flow of the test liquid to a preset constant value through the constant flow valve, so that the test liquid can flow into the in-plane permeability test module or the thickness permeability test module at a stable injection flow rate according to the current permeability test type. Thus, the permeability test under the constant flow injection method can be realized, and the permeability test system can simulate different application scenarios of the liquid forming process.

[0103] By dynamically adjusting the working state of the constant flow valve and / or the pressure valve based on the current injection method for permeability test, the permeability test system can flexibly adapt to different requirements of the injection method for permeability test, and accordingly control the test liquid to flow into the in-plane permeability test module or the thickness permeability test module at a constant injection pressure or a constant injection flow rate, which improves the accuracy and efficiency of the permeability test, and provides strong technical support for the optimization and quality control of the liquid forming process of composite materials.

[0104] The embodiment can adopt the constant pressure glue injection mode or the constant flow glue injection mode for permeability testing according to the current glue injection mode of permeability testing. When the current glue injection mode of permeability testing is the constant pressure glue injection mode, the constant flow valve is controlled to be closed, so that the liquid storage tank can be controlled by the pressure valve to provide the test liquid to the in-plane permeability test module or the thickness permeability test module at a constant injection pressure. When the current glue injection mode of permeability testing is the constant flow glue injection mode, the constant flow valve is controlled to be opened, so that the test liquid flows into the in-plane permeability test module or the thickness permeability test module at a constant injection flow rate. By dynamically adjusting the working state of the constant flow valve and / or the pressure valve based on the current glue injection mode of permeability testing, the permeability testing system can flexibly adapt to different glue injection mode requirements of permeability testing, improve the accuracy and efficiency of permeability testing, and provide strong technical support for the optimization and quality control of the liquid forming process of the composite material.

[0105] Embodiment four

[0106] Figure 4 is a flowchart of a fiber surface permeability testing method based on a permeability testing system provided by Embodiment Four of the present application. Based on the above-mentioned embodiments, the fiber surface permeability testing method is supplemented, and accordingly, as shown in Figure 4 the fiber surface permeability testing method based on the permeability testing system of the present embodiment can include:

[0107] S301, obtaining the current permeability testing type.

[0108] The permeability testing type includes in-plane permeability testing and thickness permeability testing.

[0109] S302, when the current permeability testing type is in-plane permeability testing, respectively control the first temperature control unit and the second temperature control unit to adjust the liquid storage tank and the in-plane permeability test module to the first preset temperature.

[0110] The first temperature control unit and the second temperature control unit can be heating plate structures and can be attached to the outer surfaces of the liquid storage tank and the in-plane permeability test module, respectively. After the controller determines that the current permeability testing type is in-plane permeability testing through the upper computer, the liquid storage tank and the in-plane permeability test module can be respectively temperature-adjusted through the first temperature control unit and the second temperature control unit. Thus, the temperature consistency between the liquid storage tank and the in-plane permeability test module can be ensured, the accuracy of permeability testing can be improved, and the permeability testing system can perform permeability testing under different temperature conditions.

[0111] S303, when the current permeability test type is an in-plane permeability test, adjusting the first reversing valve to a first preset gear position, so that the test liquid flows into the in-plane permeability test module through the first reversing valve; based on the in-plane permeability test module, the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid are obtained in real time; according to the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid, the in-plane permeability of the fiber surface is calculated.

[0112] S304, when the current permeability test type is an in-plane permeability test, adjusting the second reversing valve to a first preset gear position, so that the test liquid flows into the recovery tank through the second reversing valve.

[0113] Specifically, when the controller determines through the upper computer that the current permeability test type is an in-plane permeability test, the second reversing valve is adjusted to the first preset gear position, so that the in-plane liquid inlet of the in-plane permeability test module is communicated with the liquid inlet of the recovery tank through the second reversing valve, so that the test liquid discharged through the in-plane permeability test module can flow into the recovery tank. After the test liquid is collected in the recovery tank, it can be reused or conveniently processed, avoiding waste and pollution caused by direct discharge of the test liquid. In addition, the outer surface of the recovery tank can also be correspondingly provided with a fourth temperature control unit, so that the controller can also realize temperature adjustment of the recovery tank through the fourth temperature control unit. Thus, the temperature consistency of the whole permeability test system can be ensured.

[0114] S305, when the current permeability test type is a thickness permeability test, the first temperature control unit and the third temperature control unit are controlled respectively to adjust the liquid storage tank and the thickness permeability test module to a second preset temperature.

[0115] The first temperature control unit and the third temperature control unit can be heating plate structures, and can be attached to the outer surfaces of the liquid storage tank and the thickness permeability test module respectively, so that after the controller determines through the upper computer that the current permeability test type is a thickness permeability test, the first temperature control unit and the third temperature control unit can be used to adjust the temperature of the liquid storage tank and the thickness permeability test module respectively. Thus, the temperature consistency between the liquid storage tank and the thickness permeability test module can be ensured, the accuracy of the permeability test is improved, and the permeability test system can realize permeability test under different temperature conditions.

[0116] S306, when the current permeability test type is a thickness permeability test, adjusting the first reversing valve to a second preset gear position, so that the test liquid flows into the thickness permeability test module through the first reversing valve; based on the thickness permeability test module, the pressure value of the thickness liquid inlet, the pressure value of the thickness liquid outlet, and the flow of the test liquid are obtained in real time; according to the pressure value of the thickness liquid inlet, the pressure value of the thickness liquid outlet, and the flow of the test liquid, the thickness permeability of the fiber surface is calculated.

[0117] S307、in the current permeability test type is thick permeability test, the second reversing valve is adjusted to the second preset gear, so that the test liquid flows into the recovery tank through the second reversing valve.

[0118] Specifically, when the controller determines that the current permeability test type is thick permeability test through the upper computer, the second reversing valve is adjusted to the second preset gear, so that the thick liquid inlet of the thick permeability test module is communicated with the liquid inlet of the recovery tank through the second reversing valve, so that the test liquid discharged through the thick permeability test module can flow into the recovery tank. After the test liquid is collected in the recovery tank, it can be reused or conveniently processed, avoiding waste and pollution caused by direct discharge of the test liquid.

[0119] By dynamically adjusting the second reversing valve to the first preset gear or the second preset gear based on the current permeability test type, the test liquid discharged through the in-plane permeability test module or the thick permeability test module can flow into the recovery tank, so that the permeability test system can flexibly adapt to different permeability test requirements, and the accuracy of the permeability test and the resource utilization rate are improved.

[0120] In the embodiment, when the current permeability test type is in-plane permeability test, the first temperature control unit and the second temperature control unit are controlled to adjust the liquid storage tank and the in-plane permeability test module to the first preset temperature, respectively, and when the current permeability test type is thick permeability test, the first temperature control unit and the third temperature control unit are controlled to adjust the liquid storage tank and the thick permeability test module to the second preset temperature, respectively, so that the temperature consistency between the liquid storage tank and the in-plane permeability test module or the thick permeability test module can be ensured, the accuracy of the permeability test is improved, and the permeability test system can realize permeability test under different temperature conditions. In addition, when the current permeability test type is in-plane permeability test, the second reversing valve is adjusted to the first preset gear, so that the test liquid flows into the recovery tank through the second reversing valve; when the current permeability test type is thick permeability test, the second reversing valve is adjusted to the second preset gear, so that the test liquid flows into the recovery tank through the second reversing valve, thereby realizing the reuse of the test liquid, facilitating subsequent processing, improving the accuracy of the permeability test and the resource utilization rate.

[0121] Embodiment five

[0122] Figure 5 It is a flowchart of a fiber surface permeability test method based on a permeability test system provided by the embodiment five of the present application. Based on the above-mentioned embodiments, the method for calculating the in-plane permeability of the fiber surface is described in detail, and accordingly, as shown in Figure 5 the fiber surface permeability test method based on the permeability test system of the present embodiment can include:

[0123] S401, obtaining the pressure value of the in-plane liquid inlet at each time based on the first pressure test valve during the flow of the test liquid on the surface of the fibrous material.

[0124] The upper mold and the lower mold of the in-plane permeability test module can adjust the position through the electric slide group, and the gasket is arranged between the upper mold and the lower mold, so that the fibrous material can be fixed on the gasket through the upper mold and the lower mold, so that the in-plane permeability test module can support the flow of the test liquid on the surface of the fibrous material. It can be understood that for fibrous materials of different thicknesses, the thickness of the gasket can be adjusted accordingly to ensure that the upper mold and the lower mold can stably fix the fibrous material on the gasket. The first pressure test valve is arranged at the in-plane liquid inlet, so that the controller can obtain the pressure value of the in-plane liquid inlet at each time based on the first pressure test valve during the flow of the test liquid on the surface of the fibrous material.

[0125] S402, obtaining the flow peak position of the test liquid at each time based on the image captured by the camera unit during the flow of the test liquid on the surface of the fibrous material.

[0126] The upper mold of the in-plane permeability test module includes a hollow structure, and a transparent cover plate is arranged in the hollow structure. The camera unit is arranged on the side of the upper mold away from the gasket, so that the camera unit can capture real-time images of the flow of the test liquid on the surface of the fibrous material. The upper mold can be equipped with a scale, so that the controller can obtain the flow peak position of the test liquid at each time based on the image captured by the camera unit.

[0127] S403, obtaining the viscosity of the test liquid and the volume fraction of the fibrous material.

[0128] Specifically, the controller can also measure the viscosity of the test liquid and the volume fraction of the fibrous material before performing the in-plane permeability test, that is, the proportion of the volume of the fibers in the fibrous material, to provide a data basis for subsequent calculation of the in-plane permeability of the fibrous material. In addition, after adjusting the liquid storage tank and the in-plane permeability test module to the first preset temperature by controlling the first temperature control unit and the second temperature control unit, the influence of the first preset temperature on the viscosity of the test liquid needs to be considered. The viscosity of the test liquid can be the average viscosity value of the viscosity of the test liquid over time.

[0129] S404, calculating the average pressure drop value of the in-plane liquid inlet during the flow of the test liquid based on the pressure value of the in-plane liquid inlet at each time.

[0130] Specifically, after the controller obtains the pressure value of the in-plane liquid inlet at each time, the average pressure drop value of the in-plane liquid inlet during the flow of the test liquid is also calculated. For example, the controller can first obtain the pressure drop value of the in-plane liquid inlet during each time interval during the flow of the test liquid on the surface of the fibrous material, so as to calculate the weighted sum of the change of the pressure drop value of the in-plane liquid inlet in each time interval multiplied by the time span thereof, and calculate the average pressure drop value of the in-plane liquid inlet by dividing the weighted sum by the total time of the flow of the test liquid on the surface of the fibrous material, so as to provide a data basis for subsequent calculation of the in-plane permeability of the fibrous material.

[0131] S405, according to the flow peak position of the test liquid at each time, calculate the proportional value of the square of the flow peak position of the test liquid changing with time during the flow of the test liquid.

[0132] Specifically, after the controller obtains the flow peak position of the test liquid at each time, the square value of the flow peak position at each time can also be calculated. The square of the flow peak position of the test liquid has a linear relationship with time, so the proportional value of the square of the flow peak position of the test liquid changing with time can be determined by determining the slope of the linear relationship between the square of the flow peak position of the test liquid and time, which reflects the rate of change of the square of the flow peak position of the test liquid with time, so as to provide a data basis for subsequent calculation of the in-plane permeability of the fibrous material.

[0133] S406, according to the flow peak position of the test liquid at each time, the viscosity of the test liquid, the volume fraction of the fibrous material, and the average pressure drop value of the in-plane liquid inlet, calculate the in-plane permeability of the fibrous material based on the first calculation formula.

[0134] The first calculation formula is:

[0135] ;

[0136] wherein, is the in-plane permeability, is the proportional value of the square of the flow peak position of the test liquid changing with time, is the average pressure drop value of the in-plane liquid inlet, is the volume fraction of the fibrous material, is the viscosity of the test liquid.

[0137] Specifically, after the controller determines the viscosity of the test liquid, the volume fraction of the fibrous material, the average pressure drop value of the in-plane liquid inlet, and the proportional value of the square of the flow peak position of the test liquid changing with time, the in-plane permeability of the fibrous material is accurately calculated based on the first calculation formula. It can be understood that the greater the viscosity of the test liquid, the higher the in-plane permeability; the greater the volume fraction of the fibrous material, the higher the in-plane permeability; the greater the average pressure drop value of the in-plane liquid inlet, the higher the in-plane permeability; the greater the proportional value of the square of the flow peak position of the test liquid changing with time, the higher the in-plane permeability. The greater the permeable space is reduced, resulting in a decrease in the in-plane permeability, i.e., the in-plane permeability is proportional to ; the change in the average pressure value of the in-plane inlet port reflects the flow resistance of the test liquid in the fiber surface, the greater the decrease in the average pressure value of the in-plane inlet port, the weaker the permeability of the test liquid, and the in-plane permeability is reduced accordingly; the square of the flow peak position of the test liquid changes over time reflects the permeation speed of the test liquid in the plane direction, and the faster the flow peak position moves, the higher the in-plane permeability. By monitoring the flow peak position of the test liquid at each time, the viscosity of the test liquid, the volume fraction of the fiber surface, and the decrease in the average pressure value of the in-plane inlet port in real time, the permeability testing system can dynamically evaluate the flow characteristics of the test liquid on the surface of the fiber surface and accurately calculate the in-plane permeability of the fiber surface.

[0138] In this embodiment, the pressure value of the in-plane inlet port at each time is obtained based on the first pressure testing valve during the flow of the test liquid on the surface of the fiber surface, so that the average pressure drop of the in-plane inlet port during the flow of the test liquid can be calculated according to the pressure value of the in-plane inlet port at each time. The flow peak position of the test liquid at each time is obtained based on the image captured by the camera unit, so that the square of the flow peak position of the test liquid over time during the flow of the test liquid can be calculated according to the flow peak position of the test liquid at each time. And by obtaining the viscosity of the test liquid and the volume fraction of the fiber surface, the in-plane permeability of the fiber surface can be calculated based on the first calculation formula according to the flow peak position of the test liquid at each time, the viscosity of the test liquid, the volume fraction of the fiber surface, and the average pressure drop of the in-plane inlet port, so that the permeability testing system can dynamically evaluate the flow characteristics of the test liquid on the surface of the fiber surface and accurately calculate the in-plane permeability of the fiber surface.

[0139] Embodiment six

[0140] Figure 6 is a flowchart of a fiber surface permeability testing method based on a permeability testing system provided by the embodiment six of the present application. Based on the above-mentioned embodiments, the method for calculating the thickness-wise permeability of the fiber surface is described in detail, and accordingly, as shown in Figure 6 , the fiber surface permeability testing method based on the permeability testing system of the present embodiment can include:

[0141] S501, during the flow of the test liquid through the lower porous plate, the fiber surface, and the upper porous plate in turn, the pressure value of the thickness-wise inlet port is obtained in real time based on the second pressure testing valve.

[0142] The thickness-direction permeability testing module is sequentially provided with an upper support sleeve, an upper porous plate, a lower porous plate, and a lower support sleeve from top to bottom, so that the fiber object surface can be fixed between the upper porous plate and the lower porous plate through the upper support sleeve and the lower support sleeve, so that the thickness-direction permeability testing module can support the vertical penetration of the test liquid through the fiber object surface. It can be understood that for fiber object surfaces of different thicknesses, the thicknesses of the upper support sleeve and the lower support sleeve can be adjusted accordingly to ensure that the fiber object surface can be stably fixed between the upper porous plate and the lower porous plate. The second pressure testing valve is arranged at the thickness-direction liquid inlet, so that the controller can obtain the pressure value of the thickness-direction liquid inlet in real time based on the second pressure testing valve during the flow process of the test liquid through the lower porous plate, the fiber object surface, and the upper porous plate in turn.

[0143] S502, during the flow process of the test liquid through the lower porous plate, the fiber object surface, and the upper porous plate in turn, the pressure value of the thickness-direction liquid outlet is obtained in real time based on the third pressure testing valve.

[0144] The third pressure testing valve is arranged at the thickness-direction liquid outlet, so that the controller can obtain the pressure value of the thickness-direction liquid outlet in real time based on the third pressure testing valve during the flow process of the test liquid through the lower porous plate, the fiber object surface, and the upper porous plate in turn.

[0145] S503, during the flow process of the test liquid through the lower porous plate, the fiber object surface, and the upper porous plate in turn, the flow of the test liquid is obtained in real time based on the flowmeter.

[0146] The flowmeter is arranged at the thickness-direction liquid inlet, so that the controller can obtain the flow of the test liquid in real time based on the flowmeter during the flow process of the test liquid through the lower porous plate, the fiber object surface, and the upper porous plate in turn.

[0147] S504, the flow area of the test liquid is obtained according to the upper porous plate and the lower porous plate.

[0148] The flow area of the test liquid can be specifically understood as the total area of the pores actually penetrated by the test liquid when the test liquid penetrates the upper porous plate and the lower porous plate vertically. For example, the sum of the areas of the pores in the upper porous plate and the lower porous plate can be the same, and the controller can calculate the sum of the areas of the pores in the upper porous plate or the lower porous plate to determine the flow area of the test liquid.

[0149] S505, the viscosity of the test liquid and the thickness of the fiber object surface are obtained.

[0150] Specifically, the controller is further capable of measuring the viscosity of the test liquid by using a rotational viscometer or a capillary viscometer and measuring the thickness of the fibrous surface by using a vernier caliper or a thickness gauge before the in-plane permeability test is performed, so as to provide a data basis for subsequent calculation of the in-plane permeability of the fibrous surface. In addition, after the liquid storage tank and the thickness permeability test module are adjusted to the second preset temperature by controlling the first temperature control unit and the third temperature control unit, the influence of the second preset temperature on the viscosity of the test liquid needs to be considered, and the viscosity of the test liquid can be the viscosity value averaged over time.

[0151] S506, calculate the thickness inlet and outlet pressure difference value according to the pressure value of the thickness inlet and the pressure value of the thickness outlet.

[0152] Specifically, after the controller obtains the pressure value of the thickness inlet and the pressure value of the thickness outlet, the thickness inlet and outlet pressure difference value can also be calculated by calculating the difference between the pressure value of the thickness inlet and the pressure value of the thickness outlet, so as to provide a data basis for subsequent calculation of the in-plane permeability of the fibrous surface.

[0153] S507, calculate the thickness permeability of the fibrous surface according to the flow rate of the test liquid, the flow area of the test liquid, the viscosity of the test liquid, the thickness of the fibrous surface, and the thickness inlet and outlet pressure difference value, based on the second calculation formula.

[0154] The second calculation formula is:

[0155] ;

[0156] wherein, is the thickness permeability of the fibrous surface, is the flow rate of the test liquid, is the flow area of the test liquid, is the thickness of the fibrous surface, is the thickness inlet and outlet pressure difference value, is the viscosity of the test liquid.

[0157] Specifically, after the controller determines the flow rate, flow area, viscosity, fiber surface thickness, and thickness-direction inlet / outlet pressure difference of the test liquid, it accurately calculates the thickness-direction permeability of the fiber surface based on the second calculation formula. It can be understood that a larger flow area of ​​the test liquid indicates a lower thickness-direction permeability per unit area of ​​the fiber surface; higher viscosity and greater fiber surface thickness result in a correspondingly higher thickness-direction permeability; a large thickness-direction inlet / outlet pressure difference may cause the fiber surface to deform under pressure, thus reducing the thickness-direction permeability; the flow rate of the test liquid reflects the vertical permeability of the fiber surface, with a larger flow rate indicating higher porosity and higher thickness-direction permeability. By real-time monitoring of the test liquid flow rate, flow area, viscosity, fiber surface thickness, and thickness-direction inlet / outlet pressure difference, the permeability testing system can dynamically evaluate the vertical permeation characteristics of the test liquid through the fiber surface and accurately calculate the thickness-direction permeability of the fiber surface.

[0158] In this embodiment, during the flow of the test liquid through the lower perforated plate, the fiber surface, and the upper perforated plate, the pressure value at the thick-side inlet is acquired in real time using a second pressure testing valve, and the pressure value at the thick-side outlet is acquired in real time using a third pressure testing valve. This allows the thick-side inlet and outlet pressure difference to be calculated. Furthermore, during the flow of the test liquid through the lower perforated plate, the fiber surface, and the upper perforated plate, the flow rate of the test liquid is acquired in real time using a flow meter. The flow area of ​​the test liquid is acquired based on the upper and lower perforated plates, and the viscosity of the test liquid and the thickness of the fiber surface are also acquired. Based on the flow rate, flow area, viscosity, fiber surface thickness, and the thick-side inlet and outlet pressure difference, the thick-side permeability of the fiber surface is calculated using a second calculation formula. This allows the permeability testing system to dynamically evaluate the permeability characteristics of the test liquid vertically penetrating the fiber surface and accurately calculate the thick-side permeability of the fiber surface.

[0159] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this invention can be achieved, and this is not limited herein.

[0160] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A fiber surface permeability test method based on a permeability test system, characterized by, The permeability test system comprises a liquid storage tank, an in-plane permeability test module, a thickness-direction permeability test module, and a first reversing valve; the in-plane permeability test module comprises an in-plane liquid inlet and an in-plane liquid outlet; the thickness-direction permeability test module comprises a thickness-direction liquid inlet and a thickness-direction liquid outlet; the liquid outlet of the liquid storage tank is in communication with the first end of the first reversing valve, the second end of the first reversing valve is in communication with the in-plane liquid inlet, and the third end of the first reversing valve is in communication with the thickness-direction liquid inlet; the liquid storage tank is used to provide test liquid for the in-plane permeability test module or the thickness-direction permeability test module; The fiber surface permeability test method comprises: acquiring a current permeability test type; the permeability test type comprises in-plane permeability test and thickness-direction permeability test; when the current permeability test type is the in-plane permeability test, adjusting the first reversing valve to a first preset gear position, so that the test liquid flows into the in-plane permeability test module through the first reversing valve; based on the in-plane permeability test module, acquiring a pressure value of the in-plane liquid inlet and a flow peak position of the test liquid in real time; according to the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid, calculating the in-plane permeability of the fiber surface; when the current permeability test type is the thickness-direction permeability test, adjusting the first reversing valve to a second preset gear position, so that the test liquid flows into the thickness-direction permeability test module through the first reversing valve; based on the thickness-direction permeability test module, acquiring a pressure value of the thickness-direction liquid inlet, a pressure value of the thickness-direction liquid outlet, and a flow rate of the test liquid in real time; according to the pressure value of the thickness-direction liquid inlet, the pressure value of the thickness-direction liquid outlet, and the flow rate of the test liquid, calculating the thickness-direction permeability of the fiber surface.

2. The fiber surface permeability test method based on a permeability test system according to claim 1, characterized by, The permeability test system further comprises a constant flow valve; the liquid outlet of the liquid storage tank is in communication with the first end of the first reversing valve through the constant flow valve; the gas inlet of the liquid storage tank is in communication with a compressed air end, and the liquid storage tank further comprises a pressure valve; the fiber surface permeability test method further comprises: acquiring a current permeability test injection mode; the permeability test injection mode comprises constant pressure injection and constant flow injection; when the current permeability test injection mode is the constant pressure injection, controlling the constant flow valve to be closed, and providing the test liquid to the in-plane permeability test module or the thickness-direction permeability test module at a constant injection pressure through the pressure valve; when the current permeability test injection mode is the constant flow injection, controlling the constant flow valve to be opened, so that the test liquid flows into the in-plane permeability test module or the thickness-direction permeability test module at a constant injection flow rate.

3. The fiber surface permeability test method based on a permeability test system according to claim 1, characterized by, The permeability test system further comprises a recovery tank and a second reversing valve; the in-plane liquid outlet is in communication with the first end of the second reversing valve, the thickness-direction liquid outlet is in communication with the second end of the second reversing valve, and the third end of the second reversing valve is in communication with the liquid inlet of the recovery tank; the fiber surface permeability test method further comprises: When the current permeability test type is the in-plane permeability test, the second switching valve is adjusted to a first preset gear to make the test liquid flow into the recovery tank through the second switching valve; When the current permeability test injection mode is the constant flow injection, the second switching valve is adjusted to a second preset gear to make the test liquid flow into the recovery tank through the second switching valve.

4. The fiber surface permeability test method based on a permeability test system according to claim 1, characterized by, The in-plane permeability test module further comprises an upper mold, a lower mold, a gasket, a camera unit, and a first pressure test valve; the upper mold and the lower mold are used to fix the fiber surface on the gasket; the upper mold comprises a hollow structure, and a transparent cover plate is arranged in the hollow structure; the camera unit is arranged on the side of the upper mold away from the gasket; the first pressure test valve is arranged at the in-plane liquid inlet; Based on the in-plane permeability test module, the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid are obtained in real time, comprising: During the flow of the test liquid on the surface of the fiber surface, the pressure value of the in-plane liquid inlet at each time is obtained based on the first pressure test valve; During the flow of the test liquid on the surface of the fiber surface, the flow peak position of the test liquid at each time is obtained based on the image shot by the camera unit.

5. The fiber surface permeability test method based on the permeability test system according to claim 4, characterized by, According to the pressure value of the in-plane liquid inlet and the flow peak position of the test liquid, the in-plane permeability of the fiber surface is calculated, comprising: The viscosity of the test liquid and the volume fraction of the fiber surface are obtained; According to the pressure value of the in-plane liquid inlet at each time, the average pressure drop value of the in-plane liquid inlet during the flow of the test liquid is calculated; According to the flow peak position of the test liquid at each time, the proportional value of the square of the flow peak position of the test liquid changing with time during the flow of the test liquid is calculated; According to the flow peak position of the test liquid at each time, the viscosity of the test liquid, the volume fraction of the fiber surface, and the average pressure drop value of the in-plane liquid inlet, the in-plane permeability of the fiber surface is calculated based on a first calculation formula; the first calculation formula is: ； wherein, is the in-plane permeability, is a proportional value of the square of the flow front position of the test liquid as a function of time, is the average pressure drop value of the in-plane inlet, is the volume fraction of the fibrous surface, is the viscosity of the test liquid.

6. The fiber surface permeability test method based on a permeability test system according to claim 1, characterized by, The thickness permeability test module comprises an upper support sleeve, a lower support sleeve, an upper porous plate, a lower porous plate, a second pressure test valve, a third pressure test valve, and a flow meter; the upper support sleeve and the lower support sleeve are used to fix the fiber surface between the upper porous plate and the lower porous plate; the second pressure test valve and the flow meter are both arranged at the thickness liquid inlet; the third pressure test valve is arranged at the thickness liquid outlet; Based on the thickness permeability test module, the pressure value of the thickness liquid inlet, the pressure value of the thickness liquid outlet, and the flow of the test liquid are obtained in real time, comprising: During the flow of the test liquid through the lower porous plate, the fiber surface, and the upper porous plate in turn, the pressure value of the thickness liquid inlet is obtained in real time based on the second pressure test valve; The pressure value of the thick-direction outlet is acquired in real time based on the third pressure test valve during the flow of the test liquid through the lower porous plate, the fibrous surface, and the upper porous plate in sequence; The flow of the test liquid is acquired in real time based on the flow meter during the flow of the test liquid through the lower porous plate, the fibrous surface, and the upper porous plate in sequence.

7. The fiber surface permeability test method based on a permeability test system according to claim 6, characterized by, The thick-direction permeability of the fibrous surface is calculated according to the pressure value of the thick-direction inlet, the pressure value of the thick-direction outlet, and the flow of the test liquid, including: The flow area of the test liquid is acquired according to the upper porous plate and the lower porous plate; The viscosity of the test liquid and the thickness of the fibrous surface are acquired; The thick-direction inlet and outlet pressure difference value is calculated according to the pressure value of the thick-direction inlet and the pressure value of the thick-direction outlet; The thick-direction permeability of the fibrous surface is calculated based on a second calculation formula according to the flow of the test liquid, the flow area of the test liquid, the viscosity of the test liquid, the thickness of the fibrous surface, and the thick-direction inlet and outlet pressure difference value; the second calculation formula is: ； wherein, is the thickness permeability of the fibrous surface, is the flow rate of the test liquid, is the flow area of the test liquid, is the thickness of the fibrous surface, is the difference in pressure between the inlet and outlet of the thickness, is the viscosity of the test liquid.

8. The fiber surface permeability test method based on a permeability test system according to claim 1, characterized by, The liquid storage tank further comprises a first temperature control unit, the in-plane permeability test module further comprises a second temperature control unit, and the thick-direction permeability test module further comprises a third temperature control unit; the fibrous surface permeability test method further comprises: When the current permeability test type is the in-plane permeability test, the first temperature control unit and the second temperature control unit are controlled to adjust the liquid storage tank and the in-plane permeability test module to a first preset temperature, respectively; When the current permeability test injection mode is the constant flow injection, the first temperature control unit and the third temperature control unit are controlled to adjust the liquid storage tank and the thick-direction permeability test module to a second preset temperature, respectively.

9. A permeability testing system characterized by, including: a liquid storage tank, an in-plane permeability test module, a thick-direction permeability test module, a first reversing valve, and a controller; The in-plane permeability test module comprises an in-plane inlet and an in-plane outlet; the thick-direction permeability test module comprises a thick-direction inlet and a thick-direction outlet; The outlet of the liquid storage tank is in communication with the first end of the first reversing valve; the second end of the first reversing valve is in communication with the in-plane inlet; and the third end of the first reversing valve is in communication with the thick-direction inlet; The liquid storage tank is used to provide test liquid for the in-plane permeability test module or the thick-direction permeability test module; The controller is connected with the in-plane permeability test module, the thick-direction permeability test module, and the first reversing valve, respectively; and the controller is used to execute the fibrous surface permeability test method based on the permeability test system according to any one of claims 1-8.

10. The permeability testing system of claim 9, wherein, further comprising: a constant flow valve; The outlet of the liquid storage tank is in communication with the first end of the first reversing valve through the constant flow valve; The gas inlet of the liquid storage tank is in communication with a compressed air end; and the liquid storage tank further comprises a pressure valve; The controller is also connected with the constant flow valve and the pressure valve respectively, and the controller is further used for controlling the working state of the constant flow valve and / or the pressure valve according to the current permeability test glue injection mode.

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