Fabric permeability testing device for composite material wet molding process

Abstract

The utility model discloses a fabric permeability testing device for a composite material wet molding process, and relates to the technical field of permeability testing equipment, and the fabric permeability testing device specifically comprises a testing platform and a liquid feeding assembly, the test platform comprises a first pressing part and a second pressing part; the upper end surface of the first pressing part is a bearing surface for placing a test material, and the second pressing part can reciprocate along a first direction to apply a pressing force to the bearing surface; the liquid feeding assembly is adjacent to the test platform, and the liquid feeding assembly comprises a longitudinal driving part and a coating part; the coating part comprises a liquid flow pipe, one end of the liquid flow pipe is inserted into the resin storage tank, and the other end of the liquid flow pipe is used for conveying liquid to a test material placed on the bearing surface; the longitudinal driving part comprises a sliding guide rail; the sliding guide rail is in sliding connection with the liquid flow pipe through a supporting seat; and under the driving of the longitudinal driving part, the liquid flow pipe can reciprocate along the extending direction of the sliding guide rail. The device can be used for quickly and accurately testing the permeability of the test material.

Description

Technical Field

[0001] The present disclosure generally relates to the technical field of permeability testing equipment, and in particular to a composite material wet molding process fabric permeability testing device. Background Art

[0002] The wet compression molding process for composite materials has the characteristics of high efficiency, simple operation and low cost. It has been widely used in automobile products abroad, but there are few parts made by wet compression molding in China, and there are relatively few related studies. The wet compression molding process has fewer theoretical process parameters, and the relevant fabric permeability is a vacuum infusion process, which has low adaptability to wet compression molding.

[0003] Therefore, it is necessary to build a wet molding process fabric permeability test device and construct a wet molding process related model. Most of the existing process fabric permeability test devices have complex structures and low levels of automation. Therefore, designing a permeability test device that can accurately predict the wetting defects of wet molded composite materials is a key issue that needs to be solved urgently. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a composite material wet molding process fabric permeability testing device.

[0005] In a first aspect, the present application provides a composite material wet molding process fabric permeability test device, comprising: a test platform, the test platform comprising a first pressing part and a second pressing part; the upper end surface of the first pressing part is a bearing surface for placing a test material, and the second pressing part can reciprocate along a first direction to apply a pressing force to the bearing surface;

[0006] An upper liquid component, the upper liquid component is disposed adjacent to the test platform, and the upper liquid component comprises: a longitudinal drive portion and a coating portion;

[0007] The coating part includes a liquid flow tube, one end of which is inserted into the resin storage tank, and the other end of which is used to transport liquid to the test material placed on the bearing surface; the longitudinal driving part includes a sliding guide rail; the sliding guide rail is slidably connected to the liquid flow tube through a support seat;

[0008] Driven by the longitudinal driving portion, the liquid flow tube can reciprocate along the extension direction of the sliding guide rail.

[0009] According to the technical solution provided in the embodiment of the present application, the first pressing part and the second pressing part are made of a transparent material, and a first image acquisition device is disposed inside each of them;

[0010] The bearing surface is provided with a circumferentially distributed edge strip near the edge thereof, and the end surface of the second pressing portion close to the bearing surface is provided with a pressing frame corresponding to the edge strip.

[0011] According to the technical solution provided in the embodiment of the present application, a plurality of pressure sensing devices are arranged on the bearing surface;

[0012] A plurality of pressure sensing devices are evenly distributed on the bearing surface, and one of the pressure sensing devices is disposed in the middle of the bearing surface.

[0013] According to the technical solution provided in the embodiment of the present application, a glue coating head is provided at one end of the liquid flow tube for conveying liquid, and a second image acquisition device is also provided on the tube wall on the side close to the glue coating head.

[0014] According to the technical solution provided in the embodiment of the present application, the longitudinal driving part includes: first racks arranged on both sides of the sliding guide rail and first gears arranged at the bottom of the support seat and corresponding to the two first racks, and the first gear is meshed with the first racks;

[0015] A first drive motor is also disposed on the support seat, and an output shaft of the first drive motor is transmission-connected to the first gear.

[0016] According to the technical solution provided in the embodiment of the present application, the upper liquid assembly further includes: a lateral driving part;

[0017] The lateral driving unit comprises:

[0018] a second rack, the second rack being disposed at the bottom of the liquid flow tube;

[0019] A second gear, the second gear is disposed on the top of the support seat and is meshed with the second rack;

[0020] A second drive motor is also disposed on the support seat, and an output shaft of the second drive motor is transmission-connected to the second gear.

[0021] According to the technical solution provided in the embodiment of the present application, a liquid flow pump is provided on the liquid flow tube, and the liquid flow pump is used to assist the liquid flow tube in transporting liquid to the test material on the carrying surface.

[0022] According to the technical solution provided in the embodiment of the present application, the test platform further includes: a driving member, which is used to drive the second pressing part to move back and forth along the first direction to apply a pressing force to the bearing surface.

[0023] In summary, the technical scheme specifically discloses a composite material wet molding process fabric permeability testing device, specifically comprising: a test platform and an upper liquid assembly; the test platform comprises a first pressing part and a second pressing part; the upper end surface of the first pressing part is a bearing surface for placing the test material, and the second pressing part can reciprocate along the first direction to apply a pressing force to the bearing surface; the upper liquid assembly is arranged adjacent to the test platform, and the upper liquid assembly comprises: a longitudinal driving part and a coating part; the coating part comprises a liquid flow tube, one end of the liquid flow tube is inserted into the resin storage tank, and the other end thereof is used to transport liquid to the test material placed on the bearing surface; the longitudinal driving part comprises a sliding guide rail; the sliding guide rail is slidably connected to the liquid flow tube through a support seat; driven by the longitudinal driving part, the liquid flow tube can reciprocate along the extension direction of the sliding guide rail.

[0024] Most of the existing process fabric permeability testing devices have complex structures and low levels of automation. In the present application, through the mutual cooperation of the longitudinal drive part and the coating part in the upper liquid component, the coating part can be controlled to plan the dripping path according to the process requirements, so that the permeability test results are more accurate and the overall dripping process is also faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0026] Figure 1 It is a structural schematic diagram of a composite material wet molding process fabric permeability testing device.

[0027] Figure 2 It is a structural schematic diagram of a composite material wet molding process fabric permeability testing device under another working condition.

[0028] Figure 3 The present invention is a top view of the structure of the first pressing part in a composite material wet molding process fabric permeability testing device.

[0029] Figure 4 It is a structural top view of a composite material wet molding process fabric permeability testing device (excluding the second pressing part).

[0030] Numbers in the figure: 1. test platform; 11. first pressing part; 12. second pressing part; 13. first image acquisition device; 14. edge pressing groove; 15. edge pressing strip; 16. pressure sensor; 2. upper liquid assembly; 21. liquid flow tube; 22. sliding guide rail; 23. support seat; 24. glue coating head; 25. second image acquisition device; 26. first rack; 27. first gear; 28. second rack; 29. ​​second gear; 3. resin storage tank; 30. liquid flow pump; 4. stand. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the inventions. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] Please refer to Figure 1 and Figure 2 The structural schematic diagram of a composite material wet molding process fabric permeability testing device provided in this embodiment and the structural schematic diagram under another working condition include:

[0034] A test platform 1, the test platform 1 comprising a first pressing portion 11 and a second pressing portion 12; the upper end surface of the first pressing portion 11 is a bearing surface for placing a test material, and the second pressing portion 12 can reciprocate along a first direction to apply a pressing force to the bearing surface;

[0035] An upper liquid component 2, the upper liquid component 2 is arranged adjacent to the test platform 1, and the upper liquid component 2 includes: a longitudinal driving part and a coating part;

[0036] The coating part includes a liquid flow tube 21, one end of which is inserted into the resin storage tank 3, and the other end of which is used to transport liquid to the test material placed on the bearing surface; the longitudinal driving part includes a sliding guide rail 22; the sliding guide rail 22 is slidably connected to the liquid flow tube 21 through a support seat 23;

[0037] Driven by the longitudinal driving part, the liquid flow tube 21 can reciprocate along the extending direction of the sliding guide rail 22 .

[0038] First, the permeability test is based on Darcy's law, which is specifically the following formula (1):

[0039]

[0040] Explanation of each physical symbol: In the fiber composite molding process, the flow model of the resin in the reinforcement material usually adopts Darcy's law. This law can be expressed as follows: the volume flow rate Q of the resin flowing through the cross section of the sample per unit time is proportional to the cross-sectional area A and the pressure difference P on the sample, and inversely proportional to the length L in the flow direction of the fluid and the viscosity μ. The constant K is defined as the permeability.

[0041] In this embodiment, the test device comprises: a test platform 1, which further comprises a first pressing part 11 and a second pressing part 12, wherein the upper end surface of the first pressing part 11 is used to place a test material (sample), and the test material is generally a technical fabric; the second pressing part 12 is used to apply a pressing force to the first pressing part 11, thereby forming an extrusion on the test material;

[0042] In a preferred embodiment, the pressing force of the second pressing part 12 is provided by a driving member on the test platform 1, and the driving member is used to drive the second pressing part 12 to reciprocate along the first direction to apply the pressing force to the bearing surface, wherein the type of the driving member can be selected as a cylinder, and the pushing end of the cylinder is fixedly connected to the second pressing part 12, thereby driving the second pressing part 12 to move and extrude toward the bearing surface, see for details Figure 2 Schematic diagram of extrusion working conditions.

[0043] A liquid application component 2 is also provided beside the test platform 1, and the liquid application component 2 is used to drip liquid onto the test material, and the liquid is selected to be resin, for example;

[0044] The upper liquid component 2 includes: a longitudinal driving part and a coating part; wherein the coating part includes a liquid flow tube 21 for transmitting liquid, one end of the liquid flow tube 21 is inserted into the resin storage tank 3, and the other end thereof is used to transport liquid to the test material placed on the supporting surface. Since the permeability test also includes the length in the direction of fluid flow, the upper liquid component 2 also includes a longitudinal driving part, which can drive the liquid flow tube 21 to move in the extension direction of the sliding guide rail 22, and then drip the liquid according to the trajectory required by the process.

[0045] In a preferred embodiment, see Figure 1 The first pressing part 11 and the second pressing part 12 are made of a transparent material, and a first image acquisition device 13 is disposed inside each of them;

[0046] The transparent material is selected for the first lamination part 11 and the second lamination part 12 so that the first image acquisition device 13 in the two lamination parts can normally acquire images, and can acquire information such as the degree to which the test material is covered by the liquid and the length of the resin in the flow direction.

[0047] Exemplarily, the type of the first image acquisition device 13 may be an industrial camera.

[0048] See also Figure 2 The bearing surface is provided with edge pressing grooves 14 distributed circumferentially near its edge, and the end surface of the second pressing portion 12 close to the bearing surface is provided with edge pressing strips 15 corresponding to the edge pressing grooves 14.

[0049] The edge pressing groove 14 is in the shape of an annular groove on the bearing surface, and the edge pressing strip 15 is in the shape of an annular protrusion on the end surface of the second pressing part 12 close to the bearing surface. When the second pressing part 12 applies pressure to the bearing surface, the edge pressing strip 15 and the edge pressing groove 14 are pressed correspondingly to ensure the stability and accuracy of the pressing process.

[0050] In a preferred embodiment, see Figure 3 In order to collect the pressure difference on the test material, a plurality of pressure sensing devices 16 are arranged on the bearing surface; the plurality of pressure sensing devices 16 are evenly distributed on the bearing surface, and one of the pressure sensing devices 16 is arranged in the middle of the bearing surface.

[0051] The distribution of the multiple pressure sensing devices 16 is to ensure the accuracy of pressure data collection. When the permeability needs to be calculated based on the data in the later stage, the average value of the multiple pressure sensing devices can be used as a parameter involved in the calculation to ensure the accuracy of the permeability calculation result.

[0052] In a preferred embodiment, a glue coating head 24 is disposed at one end of the liquid flow tube 21 for conveying liquid, and a second image acquisition device 25 is also disposed on the tube wall on a side close to the glue coating head 24 .

[0053] The glue coating head 24 is used to drip resin onto the test material on the bearing surface. At the same time, in order to obtain the volume flow rate of the fluid flowing through the cross section of the fiber fabric per unit time, it can be measured by a resin flow meter at the glue coating head 24.

[0054] In addition, in order to ensure that the resin in the liquid flow tube 21 can drip out from the glue coating head 24, a liquid flow pump 30 is also provided on the liquid flow tube 21. The liquid flow pump 30 is used to assist the liquid flow tube 21 in conveying liquid to the test material on the carrying surface.

[0055] Next, the embodiment of the present application also adopts a combination of a transverse driving unit and a longitudinal driving unit to realize dripping path planning according to process requirements, realize glue coating on multiple paths, and try to simulate the glue coating path in product production, so that the permeability test results are more accurate.

[0056] Specifically, Figure 1 , 2 As shown in FIG. 4 , the longitudinal driving part includes: first racks 26 arranged on both sides of the sliding guide rail 22 and first gears 27 arranged at the bottom of the support seat 23 and corresponding to the two first racks 26 , and the first gears 27 are meshed with the first racks 26 ;

[0057] A first driving motor is also disposed on the support seat 23 , and an output shaft of the first driving motor is drivingly connected to the first gear 27 .

[0058] Based on the above connection relationship, when the first drive motor drives the first gear 27 to rotate, the two first gears 27 at the bottom of the support seat 23 can rotate on the corresponding first racks 26. Since the first racks 26 are distributed along the length direction of the sliding guide rail 22 (the length direction is the extension direction), the support seat 23 can drive the liquid flow tube 21 to move along the extension direction (longitudinal direction) of the sliding guide rail 22 through the rotation of the first gear 27 on the first rack 26. By switching the direction of the output shaft of the first drive motor, the liquid flow tube 21 can move back and forth along the extension direction of the sliding guide rail 22.

[0059] In addition, the upper liquid assembly 2 also includes: a transverse driving part;

[0060] The lateral driving unit comprises:

[0061] A second rack 28, wherein the second rack 28 is disposed at the bottom of the liquid flow tube 21;

[0062] The second rack 28 is arranged at the bottom of the liquid flow tube 21, which can not only support the liquid flow tube 21, but also realize the lateral movement of the liquid flow tube 21. It should be noted that since the liquid flow tube 21 needs to move, its material cannot be too hard and needs a certain amount of deformability. However, since the liquid flow tube 21 is used to transport liquid to the test material placed on the bearing surface, a glue coating head 24 and a second image acquisition device 25 are provided at one end, in order to avoid one side of the liquid flow tube 21 being too heavy, the second rack 28 is required to provide a certain supporting effect.

[0063] a second gear 29, the second gear 29 being disposed on the top of the support seat 23 and meshing with the second rack 28;

[0064] There can be multiple second gears 29 on the top of the support seat 23. In order to ensure the stability of one end of the liquid flow tube 2, the length of the second rack 28 needs to be set according to actual conditions. Accordingly, the number of second gears 29 can also be adjusted without any special limitation.

[0065] A second driving motor is also disposed on the support seat 23 , and an output shaft of the second driving motor is drivingly connected to the second gear 29 .

[0066] Based on the above connection relationship, when the second drive motor drives the second gear 29 to rotate, the first rack 28 on the top of the support seat 23 can move laterally in the horizontal direction when the second rack 29 rotates accordingly, thereby driving the liquid flow tube 21 to move laterally in the horizontal direction. By switching the direction of the output shaft of the second drive motor, the liquid flow tube 21 can move back and forth in the horizontal direction.

[0067] For the stable operation of the longitudinal driving part and the transverse driving part, the entire upper liquid assembly 2 is set on a stand 4, and the stand 4 needs to be set at the height of the first pressing part 11 in the test platform 1, and cannot affect the liquid flow tube 21 dripping resin onto the bearing surface;

[0068] Specifically, the stand 4 is C-shaped (see Figure 2 ), a main board and two side panels arranged in parallel at both ends of the main board, the space formed between the two side panels can be used to place the upper liquid component 2, in order to stabilize the transmission relationship between the first gear 27 and the first rack 26 and the transmission relationship between the second rack 28 and the second gear 29, the sliding guide rail 22 can be fixed to the corresponding side panel surface, and at the same time, the other side panel will contact the top of the liquid flow tube 21, and can also stabilize the movement process of the second rack 28 driving the liquid flow tube 21 to move.

[0069] In summary, the specific working principle of the composite material wet molding process fabric permeability testing device proposed in the embodiment of the present application is as follows:

[0070] First, the fabric to be tested is placed on the bearing surface formed by the first lamination part 11. According to the process requirements, the lateral driving part and the longitudinal driving part in the upper liquid component 2 are controlled to drive the liquid flow tube 21 to drip resin according to the set trajectory. After the resin dripping is completed, the second lamination part 12 is controlled to be released to the target position. The target position here is to obtain the cross-sectional area A. The cross-sectional area is obtained by the gap between the first lamination part 11 and the second lamination part 12. Therefore, the cross-sectional area A can be obtained by controlling the release position of the second lamination part 12. During the entire test process, the volume flow rate Q of the fluid flowing through the fabric cross section per unit time can be measured by the resin flow meter of the glue coating head; the length L in the flow direction of the resin fluid is recorded by the first image acquisition device 13 and the second image acquisition device 25; and the fluid viscosity μ is obtained according to the temperature measured by the thermometer during the test and the basic data table of the fluid commodity; the pressure difference P on the fiber fabric is taken as the average value of the fluid pressure measured by multiple pressure sensors installed on the bearing surface, and the permeability K is calculated according to the above cross-sectional area A, the resin volume flow rate Q, the length L in the flow direction of the resin fluid, the fluid viscosity μ, the pressure difference P on the fiber fabric and the formula (1).

[0071] It should be noted that the acquisition of the above-mentioned physical quantities and the subsequent penetration rate need to rely on the host computer for collection and calculation. The host computer needs to communicate with each sensor and other driving parts, which will not be elaborated here.

[0072] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A composite material wet molding process fabric permeability testing device, characterized in that: include: A test platform (1), the test platform (1) comprising a first pressing portion (11) and a second pressing portion (12); the upper end surface of the first pressing portion (11) is a bearing surface for placing a test material, and the second pressing portion (12) is capable of reciprocating along a first direction to apply a pressing force to the bearing surface; A liquid upper component (2), the liquid upper component (2) being arranged adjacent to the test platform (1), and the liquid upper component (2) comprising: a longitudinal drive part and a coating part; The coating unit comprises a liquid flow tube (21), one end of which is inserted into the resin storage tank (3), and the other end of which is used to transport liquid to the test material placed on the bearing surface; the longitudinal drive unit comprises a sliding guide rail (22); the sliding guide rail (22) is slidably connected to the liquid flow tube (21) via a support seat (23); Driven by the longitudinal driving portion, the liquid flow tube (21) can move back and forth along the extension direction of the sliding guide rail (22).

2. A composite material wet molding process fabric permeability testing device according to claim 1, characterized in that: The first pressing part (11) and the second pressing part (12) are made of a transparent material, and a first image acquisition device (13) is disposed inside each of them; The bearing surface is provided with edge pressing grooves (14) distributed circumferentially near its edge, and the second pressing portion (12) is provided with edge pressing strips (15) corresponding to the edge pressing grooves (14) on the end surface close to the bearing surface.

3. A composite material wet molding process fabric permeability testing device according to claim 2, characterized in that: A plurality of pressure sensing devices (16) are arranged on the bearing surface; A plurality of pressure sensing devices (16) are evenly distributed on the bearing surface, and one of the pressure sensing devices (16) is arranged in the middle of the bearing surface.

4. The composite material wet molding process fabric permeability testing device according to claim 1, characterized in that: A glue coating head (24) is arranged at one end of the liquid flow tube (21) for conveying liquid, and a second image acquisition device (25) is also arranged on the tube wall on the side close to the glue coating head (24).

5. The composite material wet molding process fabric permeability testing device according to claim 1, characterized in that: The longitudinal driving part comprises: first racks (26) arranged on both sides of the sliding guide rail (22) and first gears (27) arranged at the bottom of the support seat (23) and corresponding to the two first racks (26), and the first gears (27) are meshed with the first racks (26); A first drive motor is also disposed on the support seat (23), and an output shaft of the first drive motor is drivingly connected to the first gear (27).

6. A composite material wet molding process fabric permeability testing device according to claim 5, characterized in that: The upper liquid component (2) further comprises: a transverse driving part; The lateral driving unit comprises: A second rack (28), the second rack (28) being arranged at the bottom of the liquid flow tube (21); A second gear (29), the second gear (29) is arranged on the top of the support seat (23) and is meshed with the second rack (28); A second drive motor is also provided on the support seat (23), and an output shaft of the second drive motor is drivingly connected to the second gear (29).

7. The composite material wet molding process fabric permeability testing device according to claim 4, characterized in that: The liquid flow tube (21) is provided with a liquid flow pump (30), and the liquid flow pump (30) is used to assist the liquid flow tube (21) in conveying liquid to the test material on the carrying surface.

8. The composite material wet molding process fabric permeability testing device according to claim 1, characterized in that: The test platform (1) also includes a driving member, which is used to drive the second pressing part (12) to move back and forth along the first direction to apply a pressing force to the bearing surface.

Images