Method and device for measuring pulling-out smoothness of push-in type tubular fabrics

[0043] Example 1

[0044] Such as figure 1 As shown, a jack-in type tubular fabric extraction smoothness measuring device is composed of a heat pipe mechanism 1, a plug cylinder mechanism 2, a plug cylinder jack mechanism 3 and a fixing mechanism 4.

[0045] The fixing mechanism 4 includes a bottom plate 41, a left fixed rod 42, a right fixed rod 43, a middle beam 44, and an upper beam 45. The left fixed rod 42 and the right fixed rod 43 are both fixed to the bottom plate 41, and the upper beam 45 is fixed to the left The fixed rod 42 and the right fixed rod 43 are on. The plug barrel pushing mechanism 3 includes a stepping motor 31, a transmission mechanism, a left screw 34 and a right screw 37. The stepping motor 31 is fixed on the bottom plate 41, and the left screw 34 is sleeved In the left fixed rod 42, the right screw rod 37 is sleeved in the right fixed rod 43; the middle beam 44 is sleeved on the left screw rod 34 and the right screw rod 37. The transmission mechanism includes a left driving gear 32, a left driven gear 33, a right driving gear 35 and a right driven gear 36. The left driving gear 32 meshes with the left driven gear 33, and the right driving gear 35 meshes with the right driven gear 36 , The left screw rod 34 is fixed with the left driven gear 33, the right screw rod 37 is fixed with the right driven gear 36; the stepping motor 31 drives the left driving gear 32 to drive the left driven gear 33 to drive the left screw 34 rotates, the stepping motor 31 also drives the right driving gear 35 to drive the right driven gear 36 to drive the right screw 37 to rotate.

[0046] The heat pipe mechanism 1 includes a heat pipe 11, a contact pressure sensor 12, and a T-shaped connecting block 13. The tubular fabric 5 can be sleeved on the outer wall of the heat pipe 11, and the upper end of the T-shaped connecting block 13 is fixedly connected to the upper beam 45. The lower end is connected with the heat pipe 11; the touch pressure sensor 12 is fixed on the side wall of the heat pipe 11. The range of the corner radius r at the head end of the heat pipe 11 is 0.5-5 mm. The inner diameter D of the cavity of the heat pipe 11 ranges from 6 to 30 mm. The heat pipe 11 can control the ambient temperature range of the tubular fabric 5 sleeved on the wall of the heat pipe 11 to be 0°C to 300°C.

[0047] The plug cylinder mechanism 2 includes a cover clamp 21, a fastening screw 22, a plug cylinder 23, a heat insulating block 24 and a pressure sensor 25. The upper end of the pressure sensor 25 is fixed to the thermal insulation block 24, the lower end is fixed on the center beam 44, the lower end of the plug tube 23 is connected to the thermal insulation block 24, and the upper side of the plug tube 23 is provided with a cover clamp 21, and the cover clamp 21 is connected with The plug tube 23 is fixedly connected by a fastening screw 22, and one end of the tubular fabric 5 can be placed between the cover clamp 21 and the plug tube 23 and clamped by the fastening screw 22. The cover clip 21 can be placed inside the heat pipe 11.

[0048] The stepping motor 31 can drive the left screw rod 34 and the right screw rod 37 to rotate synchronously through the transmission mechanism to drive the middle beam 44 to move vertically upward, so that the tubular fabric 5 is sleeved on the outer wall of the heat pipe 11 Fold back and pull out into the inside of the heat pipe 11.

[0049] Example 2: Measurement of drawing smoothness of high-performance tubular woven fabric at 20°C (normal temperature)

[0050] A jack-in type tubular fabric extraction smoothness measurement method adopts the jack-in type tubular fabric extraction smoothness measurement device described in Example 1, and the specific steps are:

[0051] ① A heat pipe with a corner radius r of 1mm at the head end and a cavity diameter D of 15mm is selected; fine-denier PBO weakly twisted filament yarn is selected as the raw material to design a high-performance tubular woven fabric with a diameter of 16mm.

[0052] ② One end of the high-performance tubular woven fabric is sleeved on the outer wall of the temperature-controlled heat pipe 11, and the other end is placed between the clamp cover 21 and the plug tube 23 and clamped by the fastening screw 22.

[0053] ③Start the heat pipe 11 and control the temperature of the wall of the heat pipe 11 to 20°C (normal temperature).

[0054] ④Start the stepping motor 31 to drive the left driving gear 32 to drive the left driven gear 33 to drive the left screw 34 to rotate, and the step motor 31 also drives the right drive gear 35 to drive the right driven gear 36 to drive the right screw 37 to rotate , The left screw 34 and the right screw 37 rotate synchronously to drive the middle beam 44 to move vertically upwards, so that the high-performance tubular woven fabric is folded back from the outer wall of the heat pipe 11 and pushed into the inside of the heat pipe 11, touching the sensor 12 The sensing force value is the contact pressure between the high-performance tubular woven fabric and the wall of the heat pipe 11 when the high-performance tubular woven fabric is sleeved on the wall of the heat pipe 11; the sensing force value of the pressure sensor 25 is the drawing force F combined with the movement of the center beam 44 Displacement and the temperature value of the wall of the heat pipe 11 to obtain the drawing force-displacement curve of the high-performance tubular woven fabric at 20℃ (normal temperature) (see figure 2 ).

[0055] ⑤Calculate the smoothness S and axial friction f a , Wherein, the formula for calculating the smoothness S is:

[0056] S = 1 - F max F b

[0057] Where, F max -Maximum extraction force, obtained by the extraction force-displacement curve, the value is 190N, F b -The breaking strength of the tubular fabric, measured by a fabric breaking tenacity meter, the value is 359N, S-smoothness, the calculated result is 0.47;

[0058] Said axial friction f a The calculation formula is:

[0059] f a =x·πD·Δf a

[0060] Where f a -Axial friction, D- the inner diameter of the heat pipe cavity, the value is 15mm, Δf a -The axial friction force per unit area of ​​the tubular fabric is equal to the extraction force F.

[0061] Example 3: Measurement of drawing smoothness of high-performance tubular woven fabric at 300°C (high temperature)

[0062] A jack-in type tubular fabric extraction smoothness measurement method adopts the jack-in type tubular fabric extraction smoothness measurement device described in Example 1, and the specific steps are:

[0063] ① A heat pipe with a corner radius r of 1mm at the head end and a cavity diameter D of 15mm is selected; fine-denier PBO weakly twisted filament yarn is selected as the raw material to design a high-performance tubular woven fabric with a diameter of 16mm.

[0064] ② One end of the high-performance tubular woven fabric is sleeved on the outer wall of the temperature-controlled heat pipe 11, and the other end is placed between the clamp cover 21 and the plug tube 23 and clamped by the fastening screw 22.

[0065] ③Start the heat pipe 11 and control the temperature of the wall of the heat pipe 11 to 300°C (high temperature).

[0066] ④Start the stepping motor 31 to drive the left driving gear 32 to drive the left driven gear 33 to drive the left screw 34 to rotate, and the step motor 31 also drives the right drive gear 35 to drive the right driven gear 36 to drive the right screw 37 to rotate , The left screw 34 and the right screw 37 rotate synchronously to drive the middle beam 44 to move vertically upwards, so that the high-performance tubular woven fabric is folded back from the outer wall of the heat pipe 11 and pushed into the inside of the heat pipe 11, touching the sensor 12 The sensing force value is the contact pressure between the high-performance tubular woven fabric and the wall of the heat pipe 11 when the high-performance tubular woven fabric is sleeved on the wall of the heat pipe 11; the sensing force value of the pressure sensor 25 is the drawing force F combined with the movement of the center beam 44 Displacement and the temperature value of the wall of the heat pipe 11 to obtain the extraction force-displacement curve of the high-performance tubular woven fabric at 300℃ (high temperature) (see figure 2 )

[0067] ⑤Calculate the smoothness S and axial friction f a , Wherein, the formula for calculating the smoothness S is:

[0068] S = 1 - F max F b

[0069] Where, F max -Maximum extraction force, obtained from the extraction force-displacement curve, the value is 219N, F b -The breaking strength of the tubular fabric, measured by a fabric breaking tenacity meter, the value is 359N, S-smoothness, the calculated result is 0.39;

[0070] Said axial friction f a The calculation formula is:

[0071] f a =x·πD·Δf a

[0072] Where f a -Axial friction, D- the inner diameter of the heat pipe cavity, the value is 15mm, Δf a -The axial friction force per unit area of ​​the tubular fabric is equal to the extraction force F.

[0073] ⑥Calculate the smooth attenuation rate δ S , The smooth attenuation rate δ S The calculation formula is:

[0074] δ S = S n - S h S n

[0075] Where δ S -Smooth decay rate, the calculated result is 0.17, S n The smoothness under the condition of -20°C (normal temperature), obtained from Example 2, S h The smoothness under the condition of -300℃ (high temperature) is calculated from step ⑤.