JPS5836226A - Automatic controller of suction pressure in pneumatic clearer - Google Patents

Abstract

PURPOSE:When the amount of the air which flows into the filter box and goes out and the amount of fiber flowing into the fiber-collecting box reduce less than the prescribed ones, the detectors operate to make the air-volume controller act toward closing, thus the fluctuation is reduced in the suction pressure. CONSTITUTION:The detectors 11a and 11b are provided to detect the amount and pressure of the air flowing into the filter box 1 or the amount of the fiber flowing into the fiber-collecting chamber 4. The damper controller 11 joined to the detectors is connected to the motor for the damper MD on the side of air inlet or outlet of the filter box 1. When the amount of fiber piling up on the net 2 in the pneumatic box, the consumption of energy is reduced for driving the motor Mp of the suction fan 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an automatic suction pressure adjustment device for a pneumatic clearer in a spinning machine, particularly a spinning machine.

Conventional technology A pneumatic clearer, which has been commonly used in the past, uses a net stretched at a fixed position inside a filter box to collect fibers that are sucked through a duct along with air from the intake port of a flute by the suction action of an intake fan. was adsorbed to. The large suction fan disposed within the filter box is set so that the power of its drive motor can provide sufficient suction pressure even when a large amount of fibers are deposited on the net. Therefore, if the amount of fibers deposited on the net of the pneuma box is small, the suction pressure will be higher than necessary, requiring a large amount of power, which not only wastes the energy consumed, but also increases the suction pressure. If the length is too high, there is a risk that fine fibers may be sucked into the flute or the thread may become slack, causing thread breakage.

The purpose of this invention is to reduce the energy consumed by the intake fan drive motor even when the amount of fibers deposited on the pneuma box net is small, and to reduce the range of fluctuations in suction pressure to increase the suction pressure. To provide an automatic suction pressure adjustment device for a pneumatic clearer that does not increase the suction pressure of good fibers and does not have thread cutting force due to yarn slack.

EXAMPLE An example embodying the present invention will be described below with reference to FIGS. 1 to 3.

Reference numeral 1 denotes a filter box of a pneumatic clarifier, which is divided by a net 2 fixed therein into an intake chamber 3 and a collection chamber 4 in which fibers W are deposited. Reference numeral 5 denotes an intake fan disposed inside the intake chamber 3 and connected to a drive motor MP. Reference numeral 7 denotes an air outlet for discharging air from the intake chamber 3 of the filter box 1 to the outside.

A flute 8 is disposed along the bottom front roller (not shown) of the spinning machine, and is connected to the suction hole 4aK formed on the cotton collection chamber 4 side of the filter box 1 via a duct 9. An intake port 8a is provided on the curved surface in correspondence with the fiber spinning section of the front roller. Said flute 8° duct 9. Cotton collection room 4. An air flow path is formed by the intake chamber 3 and the air discharge lower. Reference numeral 1o denotes a damper disposed with respect to the suction hole 4a of the filter box 1, and is connected to the damper motor MD via a cam mechanism (not shown) as a reciprocating mechanism. When it is rotated or reversed, it reciprocates in the closing direction or opening direction, respectively. A dog lea is protruded from the base end of the damper 1o, and when the damper 10 moves in the closing direction as shown in FIG. 1, a limit switch LSC that sets the minimum opening amount is activated.

Further, as shown in FIG. 2, when the damper 10 moves in the opening direction, a limit switch L80 for setting the maximum opening amount can be operated.

The damper 10. The cam mechanism and the damper motor MD constitute an air amount adjusting device. 11 is a differential pressure switch as a damper operating device.

Air pressure detectors 11&, 11b arranged in the suction chamber 3 and the cotton collection chamber 4 are connected, and the difference in air pressure between the suction chamber 3 and the cotton collection chamber 4 is detected when the fibers are in the cotton collection chamber 4. When t exceeds the predetermined value indicated by a certain amount of accumulation, the normally open contact P8a
is closed, and normally closed contact PSb is opened.

Further, when the temperature falls below the predetermined value, the normally open contact P8a is opened and the normally closed contact PSb is closed. The differential pressure switch 11 and the atmospheric pressure detectors 11a and 11b constitute a detection device.

Next, the circuit configurations of the drive motor MP and the damper motor MD will be explained with reference to FIG.

Normally open contacts MOa 1 , M Ca 2 , and M Ca8 of a magnetic contactor MO described later are inserted in series in each phase line connecting the drive motor MP of the intake fan 5 and a three-phase power source (not shown). At the same time, an overcurrent relay OCR is inserted in series with any two-phase line.

The first circuit connected to the arbitrary two phases includes a normally closed stop pushbutton switch PBl, a normally open pushbutton switch PB2, and a normally closed contact 0CR of the overcurrent relay OCR.
b, and an electromagnetic contactor MO are connected in series, and a normally open contact MCa4 for self-holding of the contactor MO is connected in parallel with the push button switch PB2.

Further, in parallel to the series circuit of the push button switch FB2, the normally closed contact OC assistant, and the electromagnetic contactor MO.

Normally open contact PSa of differential pressure switch 11 and magnetic contactor M8
0, and a series circuit between the normally closed contact PSb of the differential pressure switch 11, which is interlocked with the normally open contact PSa, and the electromagnetic contactor M8C are connected, respectively.

Further, the other circuit connected in parallel with the first circuit is formed with an operation circuit for the damper motor, and the normally open contact MS10a of the magnetic contactor M8C is connected to the forward rotation terminal of the damper motor MD. The series circuit with the limit switch L8C (normally closed contact) is connected, and the damper motor MD
The normally open contact MS of the electromagnetic contactor M80 is connected to the reverse terminal of
A series circuit of Oa and the two-way switch L80 (normally closed contact) is connected.

Note that a capacitor C is bridged between the forward rotation terminal and the reverse rotation terminal of the damper motor MD.

Now, the operation of the pneumatic clearer configured as above will be explained.

As shown in Fig. 2, when the push button switch PB2 is pressed when the damper 10 has completely opened the suction hole 4a of the cotton collection chamber 4 and the inside of the cotton collection chamber 4 is empty, the electromagnetic contactor MC is excited. , closes the self-holding contact MCa4 and closes each contact MCat, MCa2 . MOa8 is closed and drive motor MP is rotated.

As a result, the intake fan 5 is driven and rotated, and air and fibers are drawn into the cotton collection chamber 4 through the intake hole 8a of the flute 8 and the duct 9.
Only the air is discharged from the discharge old T via the net 2 and the intake chamber 3.

Also, at this time, since the difference in atmospheric pressure between the inside of the cotton collection chamber 4 and the inside of the suction chamber 3 is less than a predetermined value, the atmospheric pressure detectors 11a and 11b
As a result, the differential pressure switch 11 maintains its normally open contact PSa in an open state and its normally closed contact PSb in a closed state. Therefore, the electromagnetic contactor MSC is excited to close the contact MSCa and rotate the damper motor MD in the forward direction. The redamper 10 operates in the closing direction by normal rotation of the damper motor MD. Then, the dog 10a of the damper 10 is set to the limit switch L.
When SC is activated, its contacts are opened and the damper motor MD is stopped. At this time, the damper 10 is in the minimum opening position with respect to the suction hole 4a as shown in FIG.

Since the amount of air flowing into the cotton collection chamber 4 through the duct 9 in the minimum opening state of the damper 10 is reduced, the energy consumed by the drive motor MP of the intake fan 5 is reduced compared to the conventional device. The suction pressure of the intake hole 8a of No. 3 does not become large.

Over time, the fibers W sucked in accumulate on the net 2t of the cotton collecting chamber 4 to some extent, and the amount of air flowing into the suction chamber 3 through the accumulated fibers W decreases. The difference in air pressure between the air pressure and the air intake chamber 3 increases, and the suction pressure at the air intake hole 8a of the flute 8 also decreases. When the difference in atmospheric pressure between the inside of the cotton collection chamber 4 and the inside of the suction chamber 3 exceeds a predetermined value, the differential pressure switch 11 is activated by the atmospheric pressure detectors 11a and 11b to close the normally open contact Pea. Open the closed contact Pub. Therefore.

The electromagnetic contactor MSO is energized to close the contact MSOa and reverse the damper motor MD. The damper 10 moves in the opening direction by reversing the damper motor MD. Then, the dog 10a of the damper 10 is set to the limit switch L.
When 80 is activated, its contacts are opened and the damper motor MD is stopped.

At this time, the damper 10 is at its maximum opening position with respect to the suction hole 4a, as shown in FIG.

In this state, as the amount of air flowing into the cotton collection chamber 4 through the duct 9 increases, the amount of air flowing into the suction chamber 3 through the fibers W deposited in the net 2J: increases. The difference in atmospheric pressure between the cotton collecting chamber 4 and the suction chamber 3 decreases, and the suction pressure at the suction hole 8a of the flute 8 increases.

Note that when the difference in air pressure between the cotton collection chamber 4 and the suction chamber 3 becomes less than a predetermined value and the damper 10 moves in the closing direction, the dog 1
When the difference in atmospheric pressure between the cotton collection chamber 4 and the suction chamber 3 exceeds a predetermined value before 0a operates the limit switch L8C, the differential pressure switch 11 is activated by the atmospheric pressure detector 118.11b.

The normally open contact PSa is closed and the normally closed contact psb is opened. As a result, the magnetic contactor MSO is energized to close the contact MSOa, and the magnetic contactor M8C is demagnetized to open the contact MSCa, and the damper motor MD
is reversed from normal rotation to move the damper 10 in the opening direction.

Conversely, when the difference in air pressure between the cotton collection chamber 4 and the suction chamber 3 exceeds a predetermined value and the damper 10 moves in the opening direction, the cotton collection chamber 4 When the difference in air pressure between the interior and the intake chamber 3 becomes less than a predetermined value, the air pressure detectors 11a and 11b activate the differential pressure switch 11, opening its normally open contact PSa and closing its normally closed contact PSb. let As a result, the magnetic contactor M
SO is demagnetized to open contact MSOa, and magnetic contactor MSC is excited to close contact MSCa.

The damper motor MD is rotated from reverse to normal to move the damper 10 in the closing direction.

In this embodiment, the energy consumed by the drive motor MP of the intake fan 5 can be reduced by sensing the difference in air pressure between the intake chamber 3 and the cotton collection chamber 4 and moving the damper 10 in the direction of closing or opening. can.

Next, a second embodiment will be described with reference to FIG.

In this embodiment, a differential pressure switch 11 and an atmospheric pressure detector 11a are used as the detection devices of the previous embodiment.

The difference is that zb is omitted and instead, an air volume detector 13 is provided as a detection device on the discharge lower, and the air volume detectors 1 and 3 are connected to the damper motor MD via an amplifier 14 etc. . Then, when the amount of air discharged from the discharge lower reaches a predetermined amount or less, a detection signal is output from the air volume detector 13, and the detection signal is used to control each damper motor MD via an amplifier 14 or the like. I am trying to rotate it forward or reverse. The damper 10 is operated in the closing direction or the opening direction by rotating the damper motor MD in the normal or reverse direction.

In this embodiment, the intake fan 5 is moved by detecting the air volume of the discharge lower and moving the damper 10 in the closing or opening direction.
The energy consumed by the motor MP can be reduced.

Next, a third embodiment will be explained according to FIG.

This embodiment differs from the first embodiment in that the air pressure detector 11a disposed in the intake chamber 3 is disposed outside the filter box 1.

The effects of this embodiment are similar to those of the first embodiment.

Note that the present invention is not limited to the above-mentioned embodiments; for example, a light emitting device in which a detection device is disposed on the side of the cotton collection chamber 4 or the suction chamber 3, and a light emitting device in which the detection device is disposed on the side of the cotton collection chamber 4 or the suction chamber 3; Fibers W composed of arranged photocells and deposited on the net 2t
The damper 10 detects the thickness of the layer from the amount of light transmitted through the fiber W layer and when the thickness reaches a predetermined limit t or less than the predetermined amount.
may be operated in the closing direction or opening direction, respectively. In this way, the amount of lIA pongee W can be directly detected and the air amount adjusting device can be operated. Also, the suction hole 4a
A mechanical detection device using a spring or the like may be used to operate in response to fluctuations in suction pressure near the same location. Furthermore, the air amount adjusting device of the first to third embodiments may be provided on the air outlet side opposite to the suction hole 4a side of the filter box 1, and in this case also, It exhibits the same effect as when provided on the suction hole 4a side.

As described in detail in the Effects section, this invention uses a net to divide the inside of the filter box into an intake chamber and a cotton collection chamber.

Air flow in a pneumatic clearer of a spinning machine in which fibers are sucked together with air from the intake port of a flute by the suction action of an intake fan installed in the intake chamber, and the fibers are guided into the collection chamber through a duct. A detection device for detecting the amount or pressure of the air flowing into the filter box and being discharged, or the amount of fibers flowing into the cotton collection chamber is installed on the airway, and the amount of air connected to the detection device is installed. A regulating device is provided on the air suction side or the discharge side of the filter box, and the amount or pressure of air flowing into the filter box and being discharged, or the amount of fibers flowing into the cotton collection chamber becomes less than a predetermined amount. When the detection device is activated, the air amount adjustment device is operated in the closing direction, and when the amount of air, pressure, or fiber amount exceeds a predetermined value, the air amount adjustment device is opened by the activation of the detection device. Even when the amount of #a fibers deposited on the pneuma box net is small, the energy consumed by the intake fan drive motor can be reduced by operating the fan in the direction of the fan, and the range of fluctuations in suction pressure can be reduced. This has the effect of eliminating causes of thread breakage due to suction of long fibers and slack of threads without increasing the suction pressure.

[Brief explanation of the drawing]

FIG. 1 is an overall road body diagram showing an embodiment embodying the present invention, FIG. 2 is a road body diagram with the damper in an open state, and FIG.
4 is a circuit diagram of the same circuit, FIG. 4 is a road diagram of the main parts showing the second embodiment, and FIG. 5 is a road diagram of the main parts showing the third embodiment. Filter box 1, net 2, suction chamber 3゜cotton collection chamber 4
．． Intake fan 5. Damper (air volume adjustment device) 10. Damper motor (air volume adjustment device) MD, differential pressure switch (detection device) 11, atmospheric pressure detector (detection device) 11a, llb
, air volume detector (detection device) 13°

Claims (1)

[Claims] l The inside of the filter box is divided into an intake chamber and a cotton collection chamber by a net, and fibers are sucked together with air from the flute's intake port by the suction action of an intake fan disposed in the intake chamber, and the fibers are collected. For the air flow path in the pneumatic clearer of a spinning machine, which leads the air into the cotton collection chamber through a duct, the amount or pressure of air flowing into the filter box and being discharged, or the amount of air flowing into the cotton collection chamber. A detection device for detecting the amount of fibers is provided, and an air volume adjustment device connected to the detection device is provided on the air suction side or the air discharge side of the filter box, so that the fibers flow into the filter box and are discharged. When the amount or pressure of air or the amount of fibers flowing into the cotton collection chamber becomes less than a predetermined amount, the air amount adjustment device is operated in the closing direction by the activation of the detection device, and the amount or pressure of air or the amount of fibers is 1. An automatic suction pressure adjustment device for a pneumatic clearer, characterized in that when the amount of air reaches a predetermined amount t, an air amount adjustment device is operated in the opening direction by the activation of a detection device. 2. The detection device according to claim 1, wherein the detection device is composed of a pair of atmospheric pressure detectors respectively disposed in the intake chamber and the cotton collection chamber of the filter box, and a damper actuating device connected to the atmospheric pressure detectors. Pneumatic clearer suction pressure automatic adjustment device. 8. The automatic suction pressure adjustment device for a pneumatic clearer according to claim 1, wherein the detection device is an airflow detector provided in a flow path on the suction side or the discharge side of the filter box. 4. The detection device consists of a phototube placed on the cotton collection chamber side or the suction chamber side, and a light emitting device placed facing the chamber on the opposite side of the phototube, in order to determine the thickness of the fiber layer deposited on the fiber layer. An automatic suction pressure adjustment device for a pneumatic clearer according to claim 1, characterized in that: 5. According to any one of claims 1 to 4, the air amount adjusting device is comprised of a damper and a damper motor connected via a reciprocating mechanism that reciprocates the damper. The automatic suction pressure adjustment device for the pneumatic clearer described above.