Fabric friction sound testing device

Abstract

The invention relates to a fabric friction sound testing device which comprises a noise reduction box, an auxiliary friction table, an objective table, a weight increasing weight, a drafting device and a traction rope. One side of the noise reduction box extends outwards to form a noise elimination channel; the auxiliary friction table is fixed to the inner bottom of the noise reduction box. The objective table is placed on the auxiliary friction table; the weight increasing weight is used for being placed in the objective table. The drafting device is arranged outside the noise reduction box; the traction rope penetrates through the silencing channel, one end of the traction rope is connected with the objective table, and the other end of the traction rope is connected with the drafting device; and the sound acquisition device is fixed in the noise reduction box. The traction device is arranged outside the noise reduction box, the bottom noise can be effectively reduced fundamentally, the accuracy of a test result is improved, one side of the noise reduction box extends outwards to form the noise elimination channel, the traction rope penetrates through the noise elimination channel, and the noise elimination channel is arranged, so that the noise reduction effect is improved. The noise reduction box can effectively reduce the influence of holes formed in the path of the traction rope on the noise reduction box on the sound insulation effect, avoids external noise interference, and ensures the accuracy of a test result.

Description

Technical Field

[0001] The present invention belongs to the technical field of textiles, and particularly relates to a fabric friction sound testing device. Background Art

[0002] Frictional abnormal noise refers to when two objects with uneven contact surfaces generate relative displacement, elastic deformation occurs microscopically until the maximum static friction is reached, and then relative movement occurs. During this period, unstable vibrations are generated at the contact interface, and the energy generated by the vibrations is radiated into the external environment in the form of frictional noise. For automotive interior materials, especially textiles, there is currently no complete and unified set of equipment and standards to evaluate the degree of frictional abnormal noise. Based on the understanding of frictional abnormal noise corresponding to the stick-slip effect, the VDA 230-206 stick-slip test standard in 2005 is generally used to measure the risk priority number (RPN). When the RPN value is between 1 and 3, it indicates that there is basically no risk of stick-slip. When the RPN value is greater than 6, it indicates that the stick-slip noise is obvious. The friction stick-slip abnormal noise testing machine SSP-04 of ZIEGLER abroad is mainly used for the testing of leather in practice and is not suitable for the evaluation of fabrics.

[0003] In view of the above problems, some domestic and foreign enterprises and individuals independently build testing equipment to evaluate the frictional noise of materials by directly collecting sounds. For example, placing the friction stick-slip abnormal noise testing machine in a large noise reduction box and cooperating with a microphone to collect sounds to collect the fabric friction sound, or placing a sliding friction type machine in it for testing, or using a large and expensive integrated machine. Most of the testing devices used for scientific research at present are large machines, and there is generally a problem of high price, which hinders the fabric development research of non-professional testing institutions. Moreover, the background noise of the machine that generates frictional movement is relatively large, and it is impossible to eliminate the background noise and collect the complete fabric friction sound at the same time. Summary of the Invention

[0004] The main purpose of the present invention is to propose a fabric friction sound testing device, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] A fabric friction sound testing device, comprising

[0007] A noise reduction box, with a sound absorption channel extending outward on one side;

[0008] A secondary friction table, fixed on the inner bottom of the noise reduction box, and the top thereof is used to fix the counter member that rubs against the fabric to be tested;

[0009] A loading table, placed on the secondary friction table, and the bottom thereof is used to fix the fabric to be tested;

[0010] Increment weights, for placement on the load platform;

[0011] Drafting device, arranged outside the noise reduction box;

[0012] Pulling rope, threaded through the sound absorption channel, with one end connected to the load platform and the other end connected to the drafting device;

[0013] Sound acquisition device, fixed inside the noise reduction box, for acquiring the sound generated by the friction between the fabric to be tested and the counterpiece.

[0014] Preferably, the noise reduction box is composed of an aluminum alloy layer, a polyester fiber board layer, and a sound insulation cotton layer adhesively bonded in sequence from outside to inside.

[0015] Preferably, the noise reduction box includes a box body and a door panel. The box body has an open front side structure, and the door panel is connected to the top of the front side of the box body through a hinge.

[0016] Preferably, a glass window is embedded in the door panel.

[0017] Preferably, the glass window has a hollow double - layer glass structure.

[0018] Preferably, the load platform is wrapped with a wide strap, and both ends of the wide strap are fixedly connected to the pulling rope.

[0019] Preferably, the periphery of the auxiliary friction platform is adhesively bonded with a first nano - glue; the load platform is a box - like structure with an open top, and the load platform includes a polyester fiber board shell. A rubber layer is adhesively bonded to the inner wall of the polyester fiber board shell, and a second nano - glue is adhesively bonded to the lower half of the outer wall of the polyester fiber board shell.

[0020] Preferably, the drafting device is a stepless variable - speed stepping motor, and its rotating shaft has a spiral groove bayonet. The rotating shaft is fixedly connected to the pulling rope.

[0021] Preferably, a tension sensor is arranged in the pulling rope.

[0022] Preferably, the sound acquisition device is a shotgun microphone, and its sound - receiving part is sealed inside the noise reduction box and is adjacent to the junction of the load platform and the auxiliary friction platform.

[0023] The present invention provides a fabric friction sound testing device, having the following beneficial effects:

[0024] 1. Compared with traditional large - scale machines, the overall volume of this device is small and the manufacturing cost is low.

[0025] 2. By arranging the drafting device outside the noise reduction box, the present invention can effectively reduce the background noise fundamentally and improve the accuracy of test results. One side of the noise reduction box extends outward to form a sound absorption channel, and the pulling rope is arranged in the sound absorption channel. By setting the sound absorption channel, the influence of the holes opened in the path of the pulling rope on the noise reduction box on its sound insulation effect can be effectively reduced, external noise interference can be avoided, and the accuracy of test results can be guaranteed.

[0026] 3. An additional weight is placed on the loading platform of the present invention. By placing additional weights with different gravities, different pressures can be provided to the fabric to be tested. The drafting device drives the loading platform to move through the pulling rope. The drafting device can provide a uniform pulling force and variable test speeds, so that this device can simulate test scenarios under different pressures and different speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the fabric friction sound testing device of the present invention;

[0028] Figure 2 is a cross-sectional view of the noise reduction box of the present invention;

[0029] Figure 3 is a cross-sectional view of the loading platform of the present invention.

[0030] In the figure: 1. Noise reduction box; 101. Sound absorption channel; 102. Glass window; 111. Aluminum alloy layer; 112. Polyester fiber board layer; 113. Sound insulation cotton layer; 2. Secondary friction table; 21. First nano glue; 3. Loading platform; 31. Polyester fiber board housing; 32. Rubber layer; 33. Second nano glue; 4. Additional weight; 5. Drafting device; 6. Pulling rope; 7. Sound collection device; 8. Hinge; 9. Wide belt; 10. Tensile sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the drawings of the present invention.

[0032] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

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

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "a plurality of" is two or more unless otherwise specifically defined. In addition, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Referring to Figures 1-3 , a fabric friction sound testing device, comprising

[0036] A noise reduction box 1, with a sound absorption channel 101 extending outward on one side;

[0037] A secondary friction table 2, fixed to the inner bottom of the noise reduction box 1, and the top thereof is used to fix the counter member that rubs against the fabric to be tested;

[0038] A loading table 3, placed on the secondary friction table 2, and the bottom thereof is used to fix the fabric to be tested;

[0039] A weight 4, used to be placed in the loading table 3;

[0040] A drafting device 5, arranged outside the noise reduction box 1;

[0041] A pulling rope 6, passing through the sound absorption channel 101, with one end connected to the loading table 3 and the other end connected to the drafting device 5;

[0042] A sound collection device 7, fixed inside the noise reduction box 1, and used to collect the sound generated by the friction between the fabric to be tested and the counter member.

[0043] When the present invention is in use, first fix the counter part on the top of the secondary friction table 2, then fix the fabric to be tested on the bottom of the loading table 3, and then place the loading table 3 on the secondary friction table 2. At this time, the fabric to be tested is in contact with the counter part, and a weight 4 is placed on the loading table 3. By placing weights 4 with different gravities, different pressures can be provided to the fabric to be tested. Finally, the drafting device 5 pulls the loading table 3 to move through the pulling rope 6. The drafting device 5 can provide a uniform pulling force and a variable test speed. When the loading table 3 moves, the fabric to be tested and the counter part slide against each other to generate noise, and the sound collection device 7 collects the sound for subsequent analysis and processing.

[0044] Compared with traditional large machines, the overall volume of this device is small and the manufacturing cost is low. By arranging the drafting device 5 outside the noise reduction box 1, the present invention can effectively reduce the background noise fundamentally and improve the accuracy of test results. One side of the noise reduction box 1 extends outward to form a sound absorption channel 101, and the pulling rope 6 is threaded through the sound absorption channel 101. By setting the sound absorption channel 101, the influence of the holes opened on the noise reduction box 1 along the path of the pulling rope 6 on its sound insulation effect can be effectively reduced, avoiding external noise interference and ensuring the accuracy of test results.

[0045] A weight 4 is placed on the loading table 3 of the present invention. By placing weights 4 with different gravities, different pressures can be provided to the fabric to be tested. The drafting device 5 pulls the loading table 3 to move through the pulling rope 6. The drafting device 5 can provide a uniform pulling force and a variable test speed. Thus, this device can simulate test scenarios under different pressures and different speeds.

[0046] In a specific embodiment, the noise reduction box 1 is composed of an aluminum alloy layer 111, a polyester fiber board layer 112, and a sound insulation cotton layer 113 that are adhesively bonded in sequence from the outside to the inside. The aluminum alloy layer 111 provides a good effect of reflecting external sound waves with its dense structure, and the polyester fiber board layer 112 and the sound insulation cotton layer 113 consume the sound wave energy passing through the aluminum alloy layer 111 with their porous structures, achieving a good effect of isolating external sounds.

[0047] In a specific embodiment, the noise reduction box 1 includes a box body and a door panel. The box body has an open front side structure, and the door panel is connected to the top of the front side of the box body through a hinge 8. The door panel can be opened for replacing test materials.

[0048] In a specific embodiment, a glass window 102 is embedded in the door panel to provide a visible space and ensure the linear friction movement of the material during the test.

[0049] In a specific embodiment, the glass window 102 is a hollow double-glass structure. Specifically, an organic glass plate can be pasted on each of the front and back, and a vacuum state is formed in the middle to form a hollow double-glass structure, improving the noise reduction effect.

[0050] In a specific embodiment, the loading platform 3 is wrapped with a wide drawstring 9, and both ends of the wide drawstring 9 are fixedly connected to the pulling rope 6. The wide drawstring 9 wrapping the loading platform 3 can increase the force-bearing area and force uniformity of the loading platform 3, thereby ensuring the linear motion of the loading platform 3.

[0051] In a specific embodiment, the auxiliary friction platform 2 is bonded with a first nano-glue 21 around it, and the opponent can be bonded to the auxiliary friction platform 2 through the first nano-glue 21; the loading platform 3 is a box structure with an open top, which is convenient for placing the weight 4, and the loading platform 3 includes a polyester fiber board shell 31. The inner wall of the polyester fiber board shell 31 is bonded with a rubber layer 32, which can reduce the noise generated by the vibration of the weight 4 during movement. The lower half of the outer wall of the polyester fiber board shell 31 is bonded with a second nano-glue 33. The area of the fabric to be tested is larger than the bottom area of the loading platform 3. When the fabric to be tested is fixed, the excess part is bonded to the second nano-glue 33 to ensure that the surface of the fabric to be tested is flat and reduce the interference caused by wrinkles.

[0052] In a specific embodiment, the stretching device 5 is a stepping motor with a continuously variable speed, and a spiral groove snap-in is provided on the rotating shaft. The rotating shaft is fixedly connected to the pulling rope 6. The provision of the spiral groove snap-in can reduce the winding radius error.

[0053] In a specific embodiment, a tension sensor 10 is provided in the pulling rope 6. During the test, tension data can be obtained through the tension sensor 10, and then the friction coefficient can be calculated.

[0054] In a specific embodiment, the sound collecting device 7 is a gun-type microphone, the sound receiving part of which is sealed inside the noise reduction box 1 and is close to the junction of the stage 3 and the auxiliary friction table 2. The accuracy of the gun-type microphone is not less than 1dB, ensuring that the tiny friction sound between the fabric to be tested and the opponent is collected.

[0055] The following is a further description with reference to more specific embodiments.

[0056] Example 1

[0057] When the present invention is used for testing between automotive interior fabrics, when the length, width and height of the loading platform 3 are 15 cm × 15 cm × 17 cm, the size of the auxiliary friction platform 2 is 15 cm × 40 cm. On the premise of not including the mass of the loading platform 3, the selection range of the weight 4 is 90 N - 250 N. The pressure on the automotive interior fabric during the test is 4 - 11 kPa. If a pressure of 250 N is to be selected, two 100 N and one 50 N weights 4 are selected. They have similar sizes, and a thin layer of foam is laid in the weights 4 to reduce the noise generated by the displacement of the weights 4 during the test. The pulling rope 6 is fixed alone on the rotating shaft of the drafting device 5, and the rotation speed is changed so that the pulling rope 6 can bypass 10 mm and 40 mm within 10 s, and the rotation speeds of the drafting device 5 under the conditions of 1 mm / s and 4 mm / s are obtained.

[0058] In this embodiment, after the test parameters are determined, a sample of 20 cm × 20 cm and a counterpart of 20 cm × 40 cm are cut. Squares of 2.5 cm × 2.5 cm are subtracted from each of the four corners of the sample, and the excess part is pasted on the second nano - adhesive 33 at the lower part of the side of the loading platform 3. The counterpart is pasted around on the first nano - adhesive 21 outside the auxiliary friction platform 2. The pulling rope 6 is fixed on the rotating shaft of the drafting device 5, the target load and the test speed are selected, and then the drafting device 5 is started to drive the loading platform 3 to slide. After testing for 10 s, the friction sound of the sample is collected by the sound collection device 7 and imported into the audio analysis software to obtain the amplitude and frequency.

[0059] Embodiment 2

[0060] When the present invention is used for the friction test between fabrics and rigid materials, the rigid material needs to be a material with a flat surface, and the rest of the steps are the same as those in Embodiment 1.

[0061] Embodiment 3

[0062] When the present invention is used for testing other fabrics and there are other test pressure requirements, the selection range of the weights 4 needs to be recalculated. It is preferred to splice the weights 4 with similar sizes for testing. At the same time, the height of the loading platform 3 is changed as required. If it is not advisable to change the height of the loading platform 3, the length - width area of the loading platform 3 can be changed to meet the test pressure requirements.

[0063] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fabric friction sound testing device, characterized in that: including a noise reduction box with a muffler channel extending outward on one side; a secondary friction table fixed to the inner bottom of the noise reduction box, and the top thereof is used to fix the counter part that rubs against the fabric to be tested; a loading table placed on the secondary friction table, and the bottom thereof is used to fix the fabric to be tested; a weight for placing in the loading table; a drafting device arranged outside the noise reduction box; a pulling rope threaded through the muffler channel, with one end connected to the loading table and the other end connected to the drafting device; a sound collection device fixed inside the noise reduction box for collecting the sound generated by the friction between the fabric to be tested and the counter part; 2. The fabric friction sound testing device according to claim 1, characterized in that: The noise reduction box is composed of an aluminum alloy layer, a polyester fiber board layer and a sound insulation cotton layer adhesively bonded in sequence from outside to inside.

3. The fabric friction sound testing device according to claim 1, characterized in that: The noise reduction box includes a box body and a door panel. The box body has an open front side structure, and the door panel is connected to the top of the front side of the box body through a hinge.

4. The fabric friction sound testing device according to claim 3, wherein: A glass window is embedded in the door panel.

5. The fabric friction sound testing device according to claim 4, wherein: The glass window is a hollow double-glass structure.

6. The fabric friction sound testing device according to claim 1, characterized in that: The loading table is wrapped with a wide strap, and both ends of the wide strap are fixedly connected to the pulling rope.

7. The fabric friction sound testing device according to claim 1, characterized in that: The periphery of the secondary friction table is adhesively bonded with a first nano glue; the loading table is a box body structure with an open top, and the loading table includes a polyester fiber board shell. A rubber layer is adhesively bonded to the inner wall of the polyester fiber board shell, and a second nano glue is adhesively bonded to the lower half of the outer wall of the polyester fiber board shell.

8. The fabric friction sound testing device according to claim 1, wherein: The drafting device is a stepless variable speed stepping motor, and its rotating shaft has a spiral groove bayonet, and the rotating shaft is fixedly connected to the pulling rope.

9. The fabric friction sound testing device according to claim 1, wherein: A tension sensor is arranged in the pulling rope.

10. A fabric friction sound testing device according to claim 1, characterized in that: The sound collection device is a shotgun microphone, and its sound receiving part is sealed inside the noise reduction box and is adjacent to the connection between the loading table and the secondary friction table.

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