Wool fabric waterproof performance testing device

Abstract

The invention discloses a wool fabric waterproof performance testing device which comprises a testing table and a pressure cylinder, a through opening is formed in the top end of the pressure cylinder, a fixing part is detachably connected to the position of the through opening, the fixing part comprises a ring body, a limiting net, a water-permeable hydrophobic net and a light-transmitting plate, and the limiting net is flush with the lower end face of the ring body. The water-permeable hydrophobic net covers the upper surface of the limiting net, the light-transmitting plate is located above the water-permeable hydrophobic net, a gap is reserved between the light-transmitting plate and the water-permeable hydrophobic net, and the surface, facing the water-permeable hydrophobic net, of the light-transmitting plate is coated with a water-discoloring layer; the device further comprises an image collector and a controller, the image collector is used for collecting image information of the water color-changing layer on the light-transmitting plate during testing, and the controller is used for controlling to stop testing and recording a real-time water pressure value when the image information meets a set standard. The whole testing process is high in automation degree, water drop determination does not need to depend on experience judgment of operators, and the uniformity of the process and the accuracy of the 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 have excellent warmth retention and comfort, and are widely used in the clothing field. For outdoor sports enthusiasts and people who often face adverse weather conditions, in addition to warmth retention, waterproofness is also an important consideration for wool fabrics. Therefore, it is necessary to test the waterproof performance of wool fabrics.

[0003] The commonly used wool fabric waterproof performance test equipment is based on the principle of hydrostatic pressure resistance test, that is: cut a wool fabric sample, fix and seal the sample on the end face of the container, add water to 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 testing 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 laborious, 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 uniformity and accuracy of test results in the existing wool fabric waterproof performance testing device when performing hydrostatic pressure resistance test.

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

[0007] A wool fabric waterproof performance testing device, the device comprises a test bench, and a pressure cylinder arranged on the test bench for providing water pressure, a through hole for placing the wool fabric is formed at the top of the pressure cylinder, a fixing part for fixing the wool fabric is detachably connected to the through hole, the fixing part comprises a ring body matching the size of the through hole, and a limiting net, a water-permeable and hydrophobic net and a light-transmitting plate arranged in the inner circle of the ring body in a direction perpendicular to the axis of the ring body, 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 between the two, and 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 light-transmitting plate during the test, and 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 part further comprises a press-fit locking piece arranged on the outer ring of the annulus, which is used to lock the fixing part at the through-port position of the pressure cylinder.

[0010] A further improvement is that the limiting net is made of vertically interwoven carbide wires, and 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 net is made of hydrophobic fibers vertically interwoven, and the diameter of the fibers is 5-10 μm and the mesh size is 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 drive 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-changeable color layer.

[0016] The beneficial effect of the present invention is that the present invention adopts a special fixing part, and its built-in limiting net can make the wool fabric basically not deform under the action of water pressure, avoiding cracking, and the water-permeable hydrophobic net can make the fabric seepage immediately pass through the water-permeable hydrophobic net without wetting and adhering, thereby forming regular water drops, and then through the induction of the water-discoloring layer on the light-transmitting plate and the real-time collection of the image sensor, the water pressure data can be obtained immediately when the set standard is met. The entire test process has a high degree of automation, and there is no need to rely on the operator's experience and judgment when identifying water drops, and the uniformity of the process and the accuracy of the results are significantly improved. 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 a front view of the present invention;

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

[0020] Figure 4 for Figure 3 The 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 collector; 5. controller; 6. driving part; M, wool fabric. DETAILED DESCRIPTION

[0022] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here 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. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0023] Combination Figure 1-4As shown, a wool fabric waterproof performance testing device, the device includes a test bench 1, and a pressure cylinder 2 arranged on the test bench 1 for providing water pressure, the pressure cylinder 2 is preferably cylindrical, a through hole for placing the wool fabric is formed at the top of the pressure cylinder 2, the wool fabric is placed to just block the through hole, the through hole is detachably connected to a fixing part 3 for fixing the wool fabric, 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 arranged 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 on the side facing the water-permeable and hydrophobic net 33, such as water-discoloring ink;

[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, and 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, the wool fabric is first cut into a shape slightly larger than the opening of the pressure cylinder 2, such as a circle, and then the wool fabric ( Figure 4 M in the figure) covers the opening, and presses and fixes the fixing part 3 on the surface of the wool fabric, so that the fabric is laid flat and the opening is blocked. At this time, the limiting net 32 ​​and the water-permeable and hydrophobic net 33 will be closely attached to the upper surface of the fabric, wherein the limiting net 32 ​​has high strength and hardness, which can prevent the fabric from protruding upward and deforming. Next, the water pressure supply of the pressure cylinder 2 is started, so that the water pressure in the pressure cylinder 2 gradually increases. During the rising process, the image information of the water-discoloring layer 341 on the light-transmitting plate 34 is collected in real time through the image collector 4.

[0026] When water seepage occurs in the fabric, the water seepage will immediately pass through the water-permeable hydrophobic net 33 under squeezing, and will not wet the water-permeable hydrophobic net 33, avoiding the phenomenon of attachment and dispersion, so the water seepage will form a relatively regular (with a large contact angle) water drop shape and gradually become larger, and the light-transmitting plate 34 and the water-permeable hydrophobic net 33 are spaced a certain distance apart, when the water drop becomes large to a height reaching the gap width, the water drop will contact the water-contacting color-changing layer 341, and the water-contacting color-changing layer 341 will immediately change color, forming a color-changing site and being collected by the image collector 4, and the collected image information is sent to the controller 5, and when the controller 5 determines that the image information meets the set standard, the control stops the test and records the real-time water pressure value, and the waterproof performance of the wool fabric can be evaluated according to the water pressure value. It should be noted that the standard set in the present invention is: three color-changing sites appear in the image information of the water-contacting color-changing layer 341, and the image recognition of each color-changing site belongs to the prior art, which will not be repeated here.

[0027] In the present invention, the fixing part 3 also includes a compression locking piece 35 arranged 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 compression locking piece 35 provides sufficient squeezing force after locking to prevent the fabric from moving and also avoid the appearance 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 80-120μm, preferably 100μm; 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 1-1.5cm, preferably 1cm.

[0029] In the present invention, the requirement of the water-permeable hydrophobic net 33 is to ensure the smooth passage of seepage water and to have a certain hydrophobic effect to avoid being wetted. Here, the water-permeable hydrophobic net 33 can be made of hydrophobic fibers (such as nylon fibers or some nanofibers) vertically interwoven, 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. The gap width is determined according to the requirements for the size of water droplets during testing. The larger the width, the higher the height of the water droplets must 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, and 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 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-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A wool fabric waterproof performance testing device, comprising a test bench (1), and a pressure cylinder (2) arranged on the test bench (1) for providing water pressure, wherein a through hole for placing wool fabric is formed at the top of the pressure cylinder (2), characterized in that: The through-port position is detachably connected with a fixing part (3) for fixing the wool fabric, the fixing part (3) comprising a ring body (31) matching the size of the through-port, 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) and a gap is left 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); The device also includes 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 control the test to stop 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) arranged 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 also includes 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 circle of 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-changeable color layer (341).

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