A wool fabric waterproof performance testing device

Abstract

The application discloses a kind of wool fabric waterproof performance testing device, device includes test table, pressure cylinder, pressure cylinder top end is formed with through opening, through opening position detachably connected with fixed part, fixed part includes ring body, and be located in the limiting net of ring body inner circle, water-permeable hydrophobic net and light-transmitting plate, limiting net with ring body lower end surface flush, water-permeable hydrophobic net covers on limiting net upper surface, light-transmitting plate is located water-permeable hydrophobic net above and leave gap between both, light-transmitting plate is coated with water discoloration layer on the side towards water-permeable hydrophobic net;Device further includes image collector and controller, image collector is used to collect the image information of water discoloration layer on light-transmitting plate when testing, controller is used to control stop testing and record real-time water pressure value when image information meets set standard.The whole testing process of the application is high in degree of automation, and when water bead is identified, it does not need to rely on the experience judgment of operator, the uniformity of process and the accuracy of result are obviously improved.

Description

Technical Field

[0001] The invention relates to the technical field of fabric detection, and in particular to a device for testing the waterproof performance of wool fabric. Background Art

[0002] Wool fabrics are widely used in the clothing industry due to their excellent warmth retention and comfort. For outdoor enthusiasts and those who frequently face adverse weather conditions, waterproofing is an important consideration in addition to its warmth retention. Therefore, testing the waterproofness of wool fabrics is essential.

[0003] The commonly used wool fabric waterproof performance test equipment is based on the principle of hydrostatic pressure resistance test, namely: cut a wool fabric sample, fix the sample and seal it on the end face of a container, add water into the container, and observe the water seepage on the back of the sample at a certain pressure increase rate (such as 6kPa / min). When the third drop of water appears on the back of the fabric (the water droplets seeping out from the edge are not counted), stop the test, record the pressure value at this time, and evaluate the waterproof performance of the wool fabric based on the pressure value. The larger the pressure value, the better the waterproof performance of the wool fabric.

[0004] However, the existing wool fabric waterproof performance test device has the following two major defects when in use: (1) It requires personnel to continuously observe the water seepage on the back of the sample, which is time-consuming and labor-intensive, and the operator cannot accurately control the identification of water droplets (the water droplets need to reach a certain size or height to meet the counting standard), and the pressure value is constantly changing, so the operator's error in identification will lead to different real-time pressure values, and ultimately make the test results less uniform; (2) As the water pressure gradually increases, the wool fabric may be squeezed and deformed, or even partially cracked, resulting in inaccurate test results. Summary of the Invention

[0005] The purpose of the present invention is to provide a wool fabric waterproof performance testing device, which solves the problem of poor test result uniformity and accuracy in the hydrostatic pressure resistance test of the existing wool fabric waterproof performance testing device.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A wool fabric waterproof performance testing device, comprising a test bench and a pressure cylinder disposed on the test bench for providing water pressure. A through hole is formed at the top of the pressure cylinder for placing the wool fabric. A fixing portion for fixing the wool fabric is detachably connected to the through hole. The fixing portion comprises a ring body that matches the size of the through hole, and a limiting net, a water-permeable and hydrophobic net, and a light-transmitting plate disposed on the inner ring body in a direction perpendicular to the ring body axis. The limiting net is flush with the lower end surface of the ring body. The water-permeable and hydrophobic net covers the upper surface of the limiting net. The light-transmitting plate is located above the water-permeable and hydrophobic net with a gap therebetween. The light-transmitting plate is coated with a water-discoloring layer on a side facing the water-permeable and hydrophobic net.

[0008] The device also includes an image collector and a controller. The image collector is used to collect image information of the water-discoloring layer on the transparent plate during the test. The controller is used to control the test to stop and record the real-time water pressure value when the image information meets the set standard.

[0009] A further improvement is that the fixing portion further includes a press-fit locking piece provided on the outer ring of the annulus, for locking the fixing portion at the opening position of the pressure cylinder.

[0010] A further improvement is that the limiting net is made of vertically interwoven carbide wires, the wire diameter is 80-120 μm, and the mesh size is 1-1.5 cm.

[0011] A further improvement is that the water-permeable and hydrophobic mesh is made of hydrophobic fibers vertically interwoven, with a wire diameter of 5-10 μm and a mesh size of 10-12 μm.

[0012] A further improvement is that the width of the gap between the light-transmitting plate and the water-permeable and hydrophobic net is 2.5-3.5 mm.

[0013] A further improvement is that the image collector is located directly above the pressure cylinder, and the device also includes a driving member for adjusting the height of the image collector.

[0014] A further improvement is that the pressure cylinder is provided with a circle of sealing gasket at the edge of the opening.

[0015] A further improvement is that the setting standard is: three color change sites appear in the image information of the water-color change layer.

[0016] The beneficial effects of the present invention lie in its use of a specially designed fixing portion. Its built-in limiting mesh prevents wool fabric from deforming and cracking under water pressure, while the permeable and hydrophobic mesh allows water to immediately pass through the fabric without wetting or adhering to it, forming neat water droplets. Through sensing by the water-discoloring layer on the translucent plate and real-time data acquisition by an image sensor, water pressure data can be immediately obtained when the set standards are met. The entire testing process is highly automated, and the identification of water droplets does not rely on the operator's experience and judgment, significantly improving the uniformity of the process and the accuracy of the results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 2 It is the front view of the present invention;

[0019] Figure 3 is a cross-sectional schematic diagram of the fixing portion;

[0020] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0021] In the figure: 1. test bench; 2. pressure cylinder; 21. sealing gasket; 3. fixing part; 31. ring body; 32. limiting net; 33. water-permeable and hydrophobic net; 34. light-transmitting plate; 341. water-discoloring layer; 35. pressing and locking part; 4. image acquisition device; 5. controller; 6. driving part; M, wool fabric. DETAILED DESCRIPTION

[0022] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0023] Combine Figure 1-4As shown, a wool fabric waterproof performance testing device, the device includes a test bench 1, and a pressure cylinder 2 provided on the test bench 1 for providing water pressure, the pressure cylinder 2 is preferably cylindrical, and a through hole is formed on the top of the pressure cylinder 2 for placing the wool fabric, which just blocks the through hole after being placed, and a fixing part 3 for fixing the wool fabric is detachably connected to the through hole, the fixing part 3 includes a ring body 31 matching the size of the through hole, and a limiting net 32, a water-permeable and hydrophobic net 33 and a light-transmitting plate 34 provided on the inner circle of the ring body 31 in a direction perpendicular to the axis of the ring body 31, the limiting net 32 ​​is flush with the lower end surface of the ring body 31, the water-permeable and hydrophobic net 33 covers the upper surface of the limiting net 32, the light-transmitting plate 34 is located above the water-permeable and hydrophobic net 33 with a gap between the two, and the light-transmitting plate 34 is coated with a water-discoloring layer 341, such as water-discoloring ink, on the side facing the water-permeable and hydrophobic net 33;

[0024] The device also includes an image collector 4 and a controller 5. The image collector 4 is used to collect image information of the water-discoloring layer 341 on the light-transmitting plate 34 during the test. The controller 5 is used to control the test to stop and record the real-time water pressure value when the image information meets the set standard.

[0025] During the test, first cut the wool fabric into a shape slightly larger than the opening of the pressure cylinder 2, such as a circle, and then Figure 4 The opening is covered with a retaining member (shown in Figure 2) and the retaining member 3 is pressed and fixed to the surface of the wool fabric, flattening the fabric and sealing the opening. The retaining mesh 32 and the permeable and hydrophobic mesh 33 are now in close contact with the fabric's upper surface. The retaining mesh 32, with its high strength and hardness, prevents the fabric from protruding upward and deforming. Next, the water pressure supply to the pressure cylinder 2 is activated, gradually increasing the water pressure within the pressure cylinder 2. During this process, the image collector 4 captures real-time image information of the hydrochromic layer 341 on the light-transmitting plate 34.

[0026] When water seeps into the fabric, the water will immediately pass through the permeable hydrophobic mesh 33 under pressure and will not wet the permeable hydrophobic mesh 33, avoiding adhesion and dispersion. Therefore, the water will form a relatively regular water drop shape (with a large contact angle) and gradually grow larger. The transparent plate 34 is spaced a certain distance away from the permeable hydrophobic mesh 33. When the water drop grows to a height that reaches the gap width, the water drop will contact the hydrochromic layer 341 and cause the hydrochromic layer 341 to immediately change color, forming a color change site that is captured by the image collector 4. The captured image information is sent to the controller 5. When the controller 5 determines that the image information meets the set standard, it controls to stop the test and record the real-time water pressure value. At this time, the water pressure value can be used to evaluate the waterproof performance of the wool fabric. It should be noted that the standard set in the present invention is: the appearance of three color change sites in the image information of the hydrochromic layer 341. The image recognition of each color change site belongs to the existing technology and will not be repeated here.

[0027] In the present invention, the fixing part 3 also includes a press-fit locking piece 35 provided on the outer ring of the ring body 31, which is used to lock the fixing part 3 at the opening position of the pressure cylinder 2. The press-fit locking piece 35 provides sufficient extrusion force after locking to prevent the fabric from moving and the formation of gaps.

[0028] In the present invention, the requirement for the limiting net 32 ​​is to have sufficient tensile strength and hardness to avoid breakage and obvious stretching under the test pressure. Here, hard alloy wires (such as commonly used tungsten-cobalt alloys) can be vertically interwoven, and the wire diameter is 80-120 μm, preferably 100 μm; in addition, the mesh size of the limiting net 32 ​​should not be too large or too small. If it is too large, the limiting effect will be reduced, and if it is too small, it will affect the fit between the fabric and the water-permeable and hydrophobic net 33. The mesh size here can be 1-1.5 cm, preferably 1 cm.

[0029] In the present invention, the requirements of the permeable hydrophobic mesh 33 are that it can ensure the smooth passage of seepage water and have a certain hydrophobic effect itself to avoid being wetted. Here, the permeable hydrophobic mesh 33 can be made of hydrophobic fibers (such as nylon fibers or some nanofibers) vertically woven together, and the wire diameter is 5-10μm and the mesh size is 10-12μm.

[0030] In the present invention, the gap width between the light-transmitting plate 34 and the water-permeable hydrophobic net 33 is 2.5-3.5 mm, preferably 2.5 mm. This gap width is determined according to the requirements for the size of water droplets during testing. The larger the width, the higher the water droplets need to be in order to contact the water-discoloring layer 341 on the light-transmitting plate 34.

[0031] In the present invention, the image collector 4 is located directly above the pressure cylinder 2. The device also includes a driving member 6 for adjusting the height of the image collector 4. The driving member 6 can be a servo motor and some necessary transmission mechanisms. The setting of the driving member 6 can lower the image collector 4 to a suitable height during the test to increase the accuracy of image acquisition, and reset the image collector 4 before and after the test to avoid affecting operations such as fabric clamping.

[0032] In the present invention, in order to improve the sealing performance of the pressure cylinder 2 after the fabric is clamped and to avoid water seepage gaps at the edge of the fabric, a circle of sealing gasket 21 can be provided at the edge of the opening of the pressure cylinder 2.

[0033] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A wool fabric waterproof performance testing device, comprising a test bench (1), and a pressure cylinder (2) provided on the test bench (1) for providing water pressure, wherein a through opening for placing wool fabric is formed at the top of the pressure cylinder (2), and the device is characterized in that: The through-hole position is detachably connected to a fixing portion (3) for fixing the wool fabric, the fixing portion (3) comprising a ring body (31) matching the size of the through-hole, and a limiting net (32), a water-permeable and hydrophobic net (33) and a light-transmitting plate (34) arranged on the inner circle of the ring body (31) along the vertical direction of the axis of the ring body (31), the limiting net (32) is flush with the lower end surface of the ring body (31), the water-permeable and hydrophobic net (33) covers the upper surface of the limiting net (32), the light-transmitting plate (34) is located above the water-permeable and hydrophobic net (33) with a gap between the two, and the light-transmitting plate (34) is coated with a water-discoloring layer (341) on the side facing the water-permeable and hydrophobic net (33); When water seepage occurs in the fabric, the seepage water passes through the water-permeable hydrophobic mesh (33) under pressure without wetting the water-permeable hydrophobic mesh (33), thereby avoiding adhesion and dispersion. As a result, the seepage water forms a water droplet shape and gradually grows larger. When the water droplet grows to a height that reaches the gap width, the water droplet contacts the water-discoloring layer (341), causing the water-discoloring layer (341) to change color immediately. The device further comprises an image collector (4) and a controller (5), wherein the image collector (4) is used to collect image information of the water-discoloring layer (341) on the light-transmitting plate (34) during testing, and the controller (5) is used to stop the test and record the real-time water pressure value when the image information meets a set standard.

2. A wool fabric waterproof performance testing device according to claim 1, characterized in that: The fixing portion (3) further comprises a press-fit locking piece (35) provided on the outer ring of the ring body (31) and used for locking the fixing portion (3) at the opening position of the pressure cylinder (2).

3. A wool fabric waterproof performance testing device according to claim 1, characterized in that: The limiting net (32) is made of hard alloy wires vertically interwoven, and the wire diameter is 80-120 μm, and the mesh size is 1-1.5 cm.

4. A wool fabric waterproof performance testing device according to claim 1, characterized in that: The water-permeable and hydrophobic net (33) is made of hydrophobic fibers vertically interwoven, with a wire diameter of 5-10 μm and a mesh size of 10-12 μm.

5. A wool fabric waterproof performance testing device according to claim 1, characterized in that: The width of the gap between the light-transmitting plate (34) and the water-permeable and hydrophobic net (33) is 2.5-3.5 mm.

6. A wool fabric waterproof performance testing device according to claim 1, characterized in that: The image collector (4) is located directly above the pressure cylinder (2), and the device further comprises a driving member (6) for adjusting the height of the image collector (4).

7. A wool fabric waterproof performance testing device according to claim 1, characterized in that: The pressure cylinder (2) is provided with a sealing gasket (21) at the edge of the opening.

8. A wool fabric waterproof performance testing device according to claim 1, characterized in that: The setting standard is that three color change sites appear in the image information of the water-changing layer (341).

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