JPH0312028B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention suctions and captures yarn at high speed, and transfers the suctioned yarn to another location where it is moving at high speed, such as a high-speed rotating machine in a spinning process. The present invention relates to a yarn threading method for threading thread onto a godet roller, a high-speed rotating bobbin, etc. used in a winding process. [Prior Art] Conventionally, in order to thread the running yarn onto a desired location, such as a godet roller, a bobbin of a winder, or a thread guide, a movable suction gun that captures and threads the running yarn has been used. It is widely known that there are. It is also known that pressurized air or pressurized water is used as a working fluid in this suction gun to suck the yarn. On the other hand, the development of high-speed winders has recently progressed, and machines with yarn speeds exceeding 4,500 m/min have entered the stage of practical use. Therefore, in such a high-speed yarn processing device,
In order to thread yarn onto a yarn processing element having a circumferential speed exceeding 4500 m/min, such as a Godet roller or a winder bobbin, the yarn suction capacity of the above-mentioned movable suction gun is required to thread the yarn at a speed of 4500 m/min or higher. It is required to be able to suction and maintain this state continuously. However, the yarn suction speed that can be created with a conventional practical movable suction gun for threading is
It is up to 4000 m/min at most, and this value is widely accepted in this industry. Therefore, when introducing the above-mentioned high-speed winder to the production site, we decided to increase the speed of each yarn processing element to 4000.
This is done by threading the captured yarn using a conventional suction gun at a speed of less than m/min, and after threading is completed, the speed is increased to full-fledged high-speed operation of the high-speed winder. The day came. Although this method is a method of threading using a conventional suction gun, it reduces the performance of the high-speed winder that has been painstakingly developed during threading, and cannot be said to fully demonstrate its performance. Therefore, there was a need to develop a freely movable suction gun for thread threading with a suction speed of 4,500 m/min or more. As will be described in detail later, the present invention uses a liquid (specifically, water) as the working fluid of the suction gun, but a device that uses water as the working fluid of the suction gun is disclosed in Japanese Utility Model Publication No. 51-28424. has been done. However, this document suggests that increasing the liquid pressure may be considered in order to improve the suction force of the yarn, but increasing the liquid pressure increases the impact force on the yarn, and on the contrary, may cause yarn breakage. This is stated (column 2, lines 5 to 7 of the same publication), suggesting that means for increasing the hydraulic pressure is not a practical means. In order to confirm this point, the inventor made an attempt to
Fluid pressure 80Kg/ ^cm2 . Using a suction gun with G water as the working fluid, the yarn was suctioned at a circumferential speed of 4500.
m/min Godet roller and hydraulic pressure 100Kg/cm ² .
Using a suction gun with G's water as the working fluid, the yarn was suctioned and threaded onto Godet rollers at a circumferential speed of 5000 m/min. Despite the extremely high fluid pressure, a surprising result occurred. The thread was successfully threaded without any thread breakage. [Problems to be Solved by the Invention] Based on the above-mentioned findings, the present invention provides technical means to satisfy the above-mentioned requirements, that is, a speed of 4500 m/min.
To provide a thread threading method using a movable suction gun capable of threading a thread at a thread threading location of min or more. [Means for Solving the Problems] The yarn threading method according to the present invention that achieves the above object is as follows. A suction gun, which is supplied with and spraying pressurized water, approaches the running yarn, and the yarn is sucked in through the suction port of the suction gun, and while maintaining this suction state, the suction gun is moved for 4500 m. The pressure of pressurized water supplied to the suction gun in the yarn suction state when threading the yarn suctioned by the suction gun onto an object having a moving speed of /min or more.
P ₀ Kg/cm ² . G is V ₁ ² /8.82×10 ⁴ ＞P ₀ ≧V ₁ ² /25.4×10 ⁴ However, V ₁ is the moving speed of the threaded object (m/
min). The traveling speed of the thread in the suction state is within the range of
A thread threading method comprising threading the thread onto the object to be threaded while suctioning the thread at a speed of 4500 m/min or more. The gist of the present invention is the above-described configuration, and the conditional expressions in the configuration will be explained. Now, if the flow velocity at the outlet of the nozzle in the suction gun from which high-pressure liquid is jetted is V ₀ m/min, and the speed of the threading object is V ₁ m/min, then the relationship between V ₀ and V ₁ is (V ₁ /0.6)≦V ₀ ≦(V ₁ /0.5) ......(a) It was found that satisfying the following relationship allows threading to be carried out with minimal breakage of the yarn during threading. . Here, V ₀ is as follows when the nozzle outlet pressure is atmospheric pressure and potential theory is used. However, g: Gravitational acceleration (=9.8m/sec ² ) r: Specific weight of liquid (Kg/m ³ ) P ₀ : Liquid pressure (gauge pressure) (Kg/cm ²・G) Also, equation (b) and From Figure 4, V _nio /V ₀ ,
V _nax /V ₀ is calculated as shown in Table 1.

[Table] However, V ₀ : Value calculated using formula (b). V _nio , V _nax : Yarn speed V ₁ corresponding to the hydraulic pressure in Figure 4
minimum and maximum values. V _nio /V ₀ , V _nax /V ₀ : Calculated values. From Table 1, V _nio /V ₀ = 0.5 is the lower limit value, therefore V ₁ /V ₀ ≧0.5 ………○a, V _nax /V ₀ = 0.6 is the upper limit value, therefore V ₁ /V ₀ ≦0.6 ………○ (b), and equation (a) can be obtained from equations ○a and ○b. Here, if C _D = V ₁ /V ₀ , then from equation (a), 0.5≦C _D ≦0.6 ......(c), and from equation (b), P ₀ = (V ₁ /C _D ) ²・γ/60 ² ×2g×10 ⁴ ………(d) is derived. Now, the maximum value of the hydraulic pressure in Fig. 4, which corresponds to the yarn speed.
Table 2 shows a comparison between P ₀₄ and the maximum value P ₀₅ of the hydraulic pressure in FIG.

[Table] However, P ₀₄ : Maximum value of hydraulic pressure P ₀ corresponding to yarn speed V ₁ in Figure 4. P ₀₅ : Value of yarn breakage generation hydraulic pressure P ₀ corresponding to yarn speed V ₁ in FIG. α: Magnification of P ₀₅ relative to P ₀₄ . In other words, the hydraulic pressure P ₀₅ at which yarn breakage occurs when threading is
As shown in a in Table 2, it is twice that of P ₀₄ . Therefore, the preferred hydraulic pressure conditions under which thread breakage during threading is minimal are the upper limit twice that of formula (d) and the lower limit of formula (d), which is expressed by the hydraulic pressure P ₀ as follows: 2 ( V ₁ /C _D ) ²・γ/60 ² ×2g×10 ⁴ ＞P ₀ ≧ (V ₁ /C _D ) ²・γ/60 ² ×2g×10 ⁴ ………(e), and (e) By substituting C _D = 0.5 of equation (c) to the left-most side of the equation and C _D = 0.6 of equation (c) to the right-most side of the equation, the preferred hydraulic pressure P ₀ to be used in the present invention and the threaded material can be calculated. The relationship with the speed V ₁ of the threaded object is as follows. 2 (V ₁ /0.5) ²・γ/60 ² ×2g×10 ₄ >P ₀ ≧ (V ₁ /0.6) ²・γ/60 ₂ ×2g×10 ⁴ ………(f) In formula (f) By substituting the specific weight of water r=1000Kg/m ³ and rearranging it, we get the following. V ₁ ² /8.82×10 ⁴ ＞P ₀ ≧V ₁ ² /25.4×10 ₄ ………(g) Then, in equation (g), the thread speed is expressed as the speed of the threaded object.
Substituting V ₁ = 4500 m/min, the preferred hydraulic pressure P ₀ Kg/cm ²・G at which thread breakage is minimal during threading is 229.5>P ₀ ≧79.7 (h), which is approximately 80 Kg/cm. It can be seen that it is between cm ² ·G and 230Kg/cm ² ·G. [Example] Hereinafter, the present invention will be explained with reference to Examples shown in the drawings. In this specification, "suction force" refers to the force that sucks the yarn into the suction tube (thread guide tube) through the yarn guide port at the tip of the suction gun, and "suction force" refers to the force that sucks the yarn into the suction tube (thread guide tube) through the yarn guide port at the tip of the suction gun. This refers to the force that attracts the yarn by the working fluid. Now, FIG. 1 is a schematic sectional view showing an example of a suction gun used in the threading method of the present invention. This suction gun 1 is provided with a suction tube 3 and a thread guide tube 3' following the suction tube 3 at the front part of the main body 2.
A thread guiding port 3a is provided at the tip of the suction tube 3. Further, in the middle part of the main body 2, there are provided an inlet 4 connected to a supply hose 9 for pumping high-pressure liquid with a liquid pressure of 80 kg/cm ² ·G or higher, and an inlet 5 connected to a supply hose 10 for compressed air. . The former inlet 4 communicates with the pressure liquid chamber 6 in the main body 2, and the latter inlet 5
communicates with a pressure chamber 8 at the tip via a conduit 7. The pressure liquid chamber 6 is provided with an injection port 11 so as to surround the rear end of the thread guide tube 3' to form a liquid jet mechanism, and the pressure chamber 8 at the tip is also provided with the suction tube 3. The injection port 12 surrounds the rear end.
is provided to form an ejector mechanism. The injection ports 11 and 12 may be annular slits or may have a plurality of holes arranged in an annular manner. There is a discharge port 1 at the rear end of the main body 2.
3 is provided, and a discharge hose 14 is connected to its discharge port 13.
are connected. In order to suction the running yarn with the suction gun 1, first, the fluid pressure from the supply hose 9 is 80 kg/
^cm2 ． The high-pressure liquid of G or higher is kept in a stopped state, and compressed air is temporarily supplied from the supply hose 10. As a result, a strong suction force is generated at the yarn guide port 3a due to the ejector effect of the compressed air ejected from the injection port 12 of the pressure chamber 8, and the running yarn is sucked into the yarn guide port 3a.
It reaches the rear end via the thread guide tube 3'. Then,
Fluid pressure from supply hose 9 is 80Kg/cm ² . A high pressure liquid of G or more is supplied and ejected from the injection port 11 of the pressure liquid chamber 6. The waterjet effect caused by the jetting of this high-pressure liquid creates a speed of 4500 m/min or more for the traveling yarn, and the yarn is sucked by the strong accompanying force and discharged to the discharge hose 14 together with the high-pressure liquid. As shown in FIG. 2, the high pressure liquid supply hose 9
is connected to the discharge port of the high pressure pump 20 via a pressure regulating valve 21. This pressure regulating valve 21 allows the necessary pressure to be set, and the pressure fed to the supply hose 9 can be arbitrarily changed by setting the pressure. Reference numeral 22 is a pressure gauge, which allows the set pressure to be confirmed. On the other hand, the discharge hose 14 is connected to the waste yarn processing tank 2.
It is connected to 3. The waste thread processing tank 23, which is a thread liquid processing tank, is provided with a mesh 24 at an intermediate position on the inside, and a liquid storage tank 25 is formed below the mesh 24. The mixture of working fluid and yarn sent from the discharge hose 9 is separated in the net 24, and the separated liquid flows down into the liquid storage tank 25. The liquid once stored in the liquid storage tank 25 is transferred to the liquid sending pipe 26.
The liquid is sucked into the high-pressure pump 20 via the filter 27, and then sent to the suction gun 1 via the supply hose 9 at a pressure of 80 kg/cm ² . It is pumped at G or more. At this time, the excess liquid that overflowed due to the throttle of the pressure regulating valve 21 is returned to the liquid storage tank 25 side from the liquid sending pipe 29. In this way, the liquid in the liquid storage tank 25 is transferred to the high pressure pump 2.
0, the suction gun 1, and the waste yarn processing tank 23 are used for suctioning the yarn while circulating it. 30 is a supply port for initially supplying liquid to the ring system, and 31
is the outlet for final drainage. The circulating fluid in the liquid storage tank 25 described above is not entirely circulated, but is partially supplied and partially drained using the supply port 30 and the discharge port 31, so that a portion of the circulating fluid is replaced with new fluid. It is also possible to circulate it while doing so. In addition, the liquid separated in the waste thread processing tank 23 is not reused, but is completely discarded, a separate liquid storage tank is provided to which new liquid is constantly supplied, and the liquid is sent from the separate liquid storage tank to the high-pressure pump. You can do it like this. The high-pressure pump 20 and the waste yarn processing tank 23 are provided on a moving cart 37 and can be moved to any desired location. In this case, only one of them may be placed. In this way, moving trolley 3
Although it is not necessarily necessary to provide the suction gun 1 on top of the spinning machine 7, by using such a movable configuration, one suction gun 1 can be used for multiple spindle spinning machines, and the workability of threading at the site is further improved. This is advantageous because it can be made more efficient. In FIG. 2, 32 is a spinning head of a high speed melt spinning machine. An oil applying device 33, godet rollers 34, 35, and a winding device 36 are provided below the spinning head 32. When threading this melt-spinning process, the initial yarn Y spun from the spinning head 32 is sucked into the yarn guide port 3a of the suction gun 1 and drawn around the godet rollers 34 and 35 while being suctioned. Finally, it is wound around the bobbin 36a of the winding device 36. Now, the suction gun 1 mentioned above has a hydraulic pressure of 80Kg/
A high-pressure liquid of cm ² ·G or more is used as a working fluid to suction the yarn. Water is most suitable as this high-pressure liquid because it is inert to the yarn and can be obtained at low cost. The suction gun 1 according to the present invention has a pressure of 80 kg/cm ² . Since the working fluid is a high-pressure liquid of G or more, the force accompanying the yarn is high, and the suction force is extremely large. Therefore, after using this suction gun to thread the yarn around a Godet roller with a circumferential speed of 4500 m/min or more, a high suction tension is continuously applied to the high-speed yarn that is fed out according to the circumferential speed of the Godet roller, resulting in an extremely stable yarn. Allows for hanging. In addition, since the liquid is incompressible, depending on the structure of the suction gun, the liquid jet effect of ejecting it from the injection port 11 of the pressure liquid chamber 6 may not be enough to suck the initial running yarn into the yarn guide port 3a. It may be difficult to generate force (high vacuum). In this case, since the ejector mechanism consisting of the pressure chamber 8 and the injection port 12 is provided at the tip of the suction gun 1 described above as an auxiliary mechanism,
It is preferable that the initial yarn is sucked in by this mechanism. Further, the high pressure liquid for the suction gun 1 can be obtained by a high pressure pump driven by a motor with a relatively small power capacity. Additionally, since the working fluid is an incompressible liquid, extremely quiet threading of less than 80 dB is possible. FIG. 3 is a flow sheet showing another embodiment of the high pressure liquid supply device for the suction gun. In the apparatus shown in FIG. 3, the supply hose 9 of the suction gun 1 is removably connected to the supply end 56 of the high-pressure liquid supply side via a push-in joint 57, and the discharge hose 14 is connected to the supply end 56 of the waste yarn processing tank 23.
It is detachably connected to via a one-touch joint 59. The liquid (water) separated in the waste yarn processing tank 23 can be discharged to the pit 61 via the discharge pipe 60, and is also transferred to the liquid storage tank 2 on the high-pressure liquid supply side via the liquid supply pipe 64.
5 and is designed to be recycled and reused in the same way as the embodiment shown in FIG. Further, the waste threads separated in the waste thread processing tank 23 are transferred to a dehydrator 62 to be dehydrated. The water separated by the dehydration process is discharged into the pit 61. Dehydrator 62
is turned on and off by a switch 63.
In this embodiment, the waste yarn processing tank 23 and the dehydrator 62 are separated and independent, but they may be integrated into one. A liquid supply pipe 50 communicating with a water supply source is connected to the liquid storage tank 25 on the high-pressure liquid supply side via a valve 51 . Water in the liquid storage tank 25 is pressurized and pumped by a high-pressure pump 20, pressure fluctuations are leveled by an accumulator 52, and then the pressure is adjusted to a predetermined pressure by a pressure regulating valve 21. The water that has exited the pressure regulating valve 21 is further adjusted for fluctuation by an accumulator 53 if necessary, and then reaches the valve 54. The excess water that overflowed due to the restriction of the pressure regulating valve 21 is returned to the liquid storage tank 2.
5 and refluxed. The high-pressure pump 20 can be turned on and off by remote control using a switch 55. Similar to the embodiment shown in FIG. 2, this device also circulates high-pressure liquid and can be used effectively without waste. Example 1 A 40D-10f x 8 yarn nylon filament was subjected to high-speed melt spinning at a yarn speed _V1 of 5500 m/min, and threading was carried out using the suction gun 1 shown in FIG. The conditions for suction gun 1 are:
On the outer periphery of the thread guide tube 3' having an inner diameter of 3 mm, injection ports 11 having a hole diameter of 1 mm, 4 holes, and an injection angle of 10 degrees (with respect to the central axis) were arranged in an annular manner. In addition, the working fluid used is water, and the high-pressure pump 20 has low power consumption.
I used one with a capacity of 22KW/H. The initial yarn is reliably sucked in by the auxiliary ejector mechanism, and subsequent suction is performed by increasing the pressure of high-pressure water to ₂₀₀
Kg/ ^cm2 . By setting it to G, a high tension was developed and extremely stable threading was possible. Furthermore, the noise generated during threading was less than 80 dB and did not bother the ears. Example 2 For a nylon filament in the range of 17 to 140D x 6 to 48F, the conditions of the suction gun 1 of the present invention were as follows: the inner diameter of the injection port 11 was 1 mm, the number of holes in the injection port 11 was 4, and the injection angle of the injection port 11 was 10. degree (relative to the central axis), minimum diameter of discharge port 13 4 mm, discharge hose 14
The inner diameter of the thread guide tube 3' is 8 mm, the inner diameter of the thread guide tube 3' is 3 mm, the working fluid is water (water temperature 18℃), and the injection water pressure P ₀ is 60 to 180.
Kg/ ^cm2 . A yarn suction experiment was conducted when the yarn was changed to G, and the results are shown in FIG. From this figure, in order to suction yarn with a running speed V ₁ of 4500 m/min or more, the jetting water pressure P ₀ must be 80 Kg/cm ² . G or more is required, and it can be seen that this agrees well with the above-mentioned equation (h). In this table, the ◯ marks indicate the suction experiment points, and the shaded area indicates the application area of the present invention. Example 3 Next, in order to confirm the presence or absence of yarn breakage when using the threading method of the present invention, the suction gun 1 shown in Example 2 was used to test the yarn on a 70D x 24f nylon filament. Speed V ₁ m/min
The suction tension Tg acting on the traveling yarn is changed every 500 m/min from 45000 to 6500 m/min, and the water pressure P ₀ Kg/cm ² is injected by the high-pressure pump 20. Figure 5 shows the relationship between G and curves A to H in the figure when the yarn speed V ₁ m/min is 4500, 5000, 5500, and 5500, respectively.
This is a curve showing the above relationship at 6000 and 6500 m/min. In the figure, the x mark indicates the yarn breakage point, which was obtained by substituting the yarn speed V ₁ of each curve into the left side of equation (g) shown on page 9 on the curves A to E. Injection water pressure P ₀ Kg/cm ² . It can be seen that it almost coincides with the line X connecting the plot points of the upper limit value of G. On the other hand, the line Y is the injection water pressure P ₀ Kg/cm ² . obtained by substituting the yarn speed V ₁ in each curve into the right side of the above equation (g) on the curves A to E. This is a line connecting the plot points of the lower limit value of G, and in the area below this line the suction force is weak, so threading is impossible. That is, from this Fig. 5, the preferred yarn speed V ₁ m/min that allows yarn threading without causing yarn breakage.
and injection water pressure P ₀ Kg/cm ² . It can be seen that the relationship with G almost coincides with equation (g). [Effect of the invention] The threading method of the present invention has the advantage that the threading method of the present invention reduces the moving speed of the object
For threaded objects whose V ₁ is 4500 m/min or more,
Pressurized water pressure of the suction gun when the yarn is being suctioned P ₀ Kg/cm ² . By supplying pressurized water within the range that satisfies V ₁ ² /8.82×10 ⁴ >P ₀ ≧V ₁ ² /25.4×10 ⁴ as G, the running speed of the thread in the suction state is 4500.
Since threading is performed by creating a condition where the thread speed is over 4,500 m/min, threading can be carried out stably without any thread breakage at high speeds of over 4,500 m/min, which could not be achieved with conventional suction guns. It has the excellent effect of being able to

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an example of a suction gun used in the threading method of the present invention, and FIG. 2 is a schematic diagram of the entire apparatus for carrying out the threading method.
FIG. 3 is a schematic flow sheet showing another example of the apparatus corresponding to FIG. 2, FIG. 4 is a graph showing the relationship between the liquid pressure supplied to the suction gun and the yarn speed, and FIG. It is a graph showing the relationship between strip tension and hydraulic pressure. Explanation of symbols in the drawings, 1... Suction gun,
6... Pressure liquid chamber, 9... Supply hose (of high pressure liquid), 11... Injection port, 14... Discharge hose, 20
... High pressure pump, 22 ... Pressure regulating valve, 23 ... Waste thread processing tank, 25 ... Liquid storage tank.

Claims (1)

[Scope of Claims] 1. A suction gun, which is supplied with and spraying pressurized water, approaches the running yarn, and the yarn is sucked in through the suction port of the suction gun, and is suctioned, while maintaining this suction state. When the suction gun is moved to thread the yarn being sucked by the suction gun onto an object having a moving speed of 4500 m/min or more, the pressure P of pressurized water supplied to the suction gun in the yarn suction state is ₀ Kg/ ^cm2 . G is V ₁ ² /8.82×10 ⁴ ＞P ₀ ≧V ₁ ² /25.4×10 ⁴ However, V ₁ is the moving speed of the threaded object (m/
min). The traveling speed of the thread in the suction state is within the range of
A thread threading method comprising threading the thread onto the object to be threaded while suctioning the thread at a speed of 4500 m/min or more.