JPH0147566B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for dispensing layers of fiber flock, and more particularly to an apparatus for dispensing layers of fiber flock for preparing a spinning machine such as a card.

The device of the invention has a feed tube with an upper open take-in end and a lower open take-off end, and is a device for delivering layers of fiber flock for preparation of spinning machines such as cards. The inlet end is provided with a member for introducing the fiber flock, and the outlet end is provided with a member for sending out a layer of fiber flock, so that the fiber flock introduced into the inlet end is An adjustment member is provided for adjusting the amount, and this adjustment member is provided with an air circulation device constituting a closed system for maintaining the air flow in the supply tube towards the outlet end;
This air circulation device includes an air outlet disposed between the intake end and the outlet end of the supply tube, a first open end disposed outside the supply tube on the air outlet side, and a first open end disposed outside the supply tube on the air outlet side. an air duct having a second open end attached to the area of the intake end of the air duct, and further arranged within the air duct to supply air through the air duct from an air outlet of the cylinder on a partially closed circuit; and a ventilation fan for supplying air to the intake end area of the vent.

In the case of the device disclosed in German Patent No. 28 04 413, the air circulating in the closed air circulation system is used in particular to compress the floes deposited in the supply cylinder. The degree of compaction determines the amount of product removed from the draw roller. If the degree of compression is constant over time, the amount of product is also constant over time. In other words, uniformity can be obtained in terms of time. The degree of compression is related to the speed of air at which the floc is swept by the air.
The velocity of the air is related to the pressure differential created by the ventilation fan and the flow resistance of the floes deposited in the feed tube. Flow resistance is related to the height of the deposited floc, all else being constant. The fluctuations in the amount of floc create different flow resistances and therefore different air velocities, and also pressure differences in front and behind the deposited floc, ie before and after the ventilation fan. This results in compression unevenness and variations in the uniformity of the drawn fiber flock layer. On the one hand, pressure is extracted in the supply cylinder for regulating the amount of floc (supplied from the reserve cylinder). During operation, therefore, within the range of regulation, the above-mentioned fluctuations in the inflow amount occur.

It is therefore an object of the present invention to reduce the influence of variations in the inflow amount, in particular in the amount of floc in the feed tube, on the compression of the fiber flocs.

This object is solved by the features indicated in claim 1.

By providing an air branching means in the air circulation device, the circle consisting of the air duct and the supply cylinder is structurally opened, so that a branch of air from the atmosphere can be introduced into the circulation or removed from the circulation. A diversion of air is allowed to escape into the atmosphere to maintain balance. A particular advantage of this feature is that the effects of machine-specific flow resistance are significantly reduced. This is important since many devices (flock feeders) are arranged in a common device and equal flow conditions are required inside all feed tubes. According to the present invention, since the air circulation systems of all cylinders are in communication with the atmosphere, that is, the air holes serving as air branching means are in communication, and the air circulation systems are also partial and incomplete closed circuits. In that respect, the same standard pressure prevails in both cases. In this way, the amount of floc in the feed tube (height of accumulated flocs) has less of an effect on the degree of compaction, so variations in floc height have less of an effect on the dispersion of compaction. . If the air openings are arranged on the suction side of the ventilation fan, there is no longer any throttling, for example on the suction side, as opposed to known devices. Ventilation fans can take in more air from outside to accommodate variations. Due to the reduced aperture,
The flow velocity of the air passing through the floes accumulated in the supply tube is less affected. The influence of variations in the deposited flocs on the degree of compaction and thus also on the temporal uniformity of the layer of fiber floes introduced onto the card is thereby reduced.

Preferably, the air holes are provided on the suction side and the outlet side of the ventilation fan in the air duct, or on the suction side or the outlet side. According to a further preferred embodiment, the air hole is arranged above the air outlet of the supply tube.

The air flowing out from the air outlet contains dust. However, this is not really a problem. This is because only a relatively small stream of air enters and leaves the air vent, and only the air stream that exits from the vent contains dust. In order to ensure that the air in the textile mill is kept clean even with respect to small outgoing air streams, according to a particularly preferred embodiment, a filter is provided in the air distribution means, ie in the air holes.

Preferably, a regulating element is provided for regulating the flow of air through the air distribution means, preferably a throttle valve, for example a slider, a valve plate or a disc. This element is fixed directly or indirectly to the air duct and works together with the air holes. Adjustment of this member changes the size of the air holes and therefore the amount of air passing therethrough. In particular, in this way the air flow in the supply cylinders of several card supply devices is harmonized in succession. This member is adjusted in relation to the pressure or air velocity in the air circuit. This can be done mechanically, e.g. by the elasticity of a spring, or by a measuring element (e.g. for pressure or speed), a regulator and an adjusting element (e.g. a servomotor or a cylinder in an adjustable opening). This is done by an adjustment system.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

What is shown in FIG. 1 is a card feeding device having an upper reserve cylinder 1 and a lower supply cylinder 2. As shown in FIG. The supply cylinder 2 is provided with an upper open intake end 2a and a lower open takeout end 2b. Attached to the intake end 2a is a floc feeding device consisting of a intake roller 3 and an open roller 4. Two drawing rollers 5a, 5b are arranged below the removal end 2b, by means of which the layer of fiber flock is guided into a known card. Further, an electronic pressure switch 6 is disposed on the side wall of the supply cylinder 2 between the intake end 2a and the air outlet 7a, and this electronic pressure switch 6 is connected to a regulator (not shown) and the intake roller 3. drive motor (not shown)
In conjunction with this, the amount of fiber floc introduced into the intake end 2a is adjusted. Further, an air circulation device constituting a closed system is provided to maintain the flow of air within the supply tube 2 toward the takeout end 2b. This air circulation device includes air outlets 7a and 7b and an air duct 8 disposed outside the supply tube 2.
a, 7b are disposed on the wall between the intake end 2a and the outlet end 2b of the supply cylinder 2, and the air duct 8 has a first open end 8a on the air outlet 7a, 7b side. and an open end 8b of Magoichi on the intake end 2a side of the supply tube 2. A ventilation fan 9 is disposed inside the air duct 8, and carries air in a closed circuit from the supply pipe 2 to the air outlet 7.
a, 7b, the air duct 8, and the supply tube 2.
into the intake end 2a. As air branching means, a ventilation fan 9 in an air pipe duct and an air duct 8 are used.
An air hole 10 is provided between the first open end 8a of the
is provided. The air hole 10 is connected to the air duct 8
It may be a simple notch formed in the a wall,
A protrusion 10a may also be provided. The black arrows indicate the fiber flocks 11a (inside the reserve tube 1) and 11b (inside the supply tube 2), the white arrows indicate the air flow, and the half-black and half-white arrows indicate the flow of air. Showing fiber flock. Above the spare cylinder 1, there is a transfer pipe 12 for pneumatically transporting the fiber flock from minute openings (not shown) to a large number of spare cylinders.
is extending. Between the ventilation fan 9 and the end 8b in the air duct 8, air distribution devices 13a, 13b are arranged to distribute the air evenly over the entire width. Reference numeral 14 indicates the tin case of the device.

When the pressure inside the supply tube 2 decreases, the pressure switch 6
Via the drive (not shown) of the feed roller (take-in roller) 3 is switched on or the rotational speed is increased, so that the fiber flock is fed from the reserve cylinder 1 to the feed cylinder 2. As a result, the amount of fiber flock 11b in the supply tube 2 increases,
As a result, the ventilation fan 9 experiences greater resistance to suction. In other words, the ventilation fan 9 takes in less air. Correspondingly, less air is supplied by the ventilation fan and, as a result, less air is available for compression. At the same time, a lower underpressure occurs between the end 8a of the air duct 8 and the ventilation fan 9. As a result, air flows into the air duct 8 from the outside (atmosphere) through the air holes 10, and as a result, the amount of air increases. Then, the ventilation fan 9
From b, a large amount of air can again be introduced into the supply cylinder 2 for compression. When the pressure in the supply cylinder increases, the air in the air duct 8 flows out (into the atmosphere) through the air holes 10, in a manner opposite to the previous case, so that the ventilation fan 9 removes the end 8b. The amount of compressed air introduced into the supply tube 2 through the compressed air is reduced.

According to FIG. 2, a ventilation fan 9 is disposed on the side of the supply cylinder 2, and the ventilation fan 9 sends an air flow into the supply cylinder 2 from the end 8b of the air duct 8. The end portion 8b is disposed as a side opening in the wall of the supply cylinder 2, and is located above the air outlet ports 7a, 7b and above the open roller 4.
It is below. Air flow is provided at the end 8 by a ventilation fan 9.
The air is blown into the supply tube 2 from the air outlet 7b, flows between the fiber flocs housed therein, compresses the fiber flock, and then exits the supply tube from the air outlet ports 7a and 7b. Above the air outlets 7a, 7b and below the open roller 4, air holes 10 are provided in the wall of the supply tube at approximately the height of the end 8b and opposite thereto.
is installed. This air hole 10 has an end portion 8b
It may be provided above. The air hole 10 is provided with a protrusion 10a that communicates with the outside air (atmosphere). The air outlets 7a, 7b communicate with a common, schematically illustrated connecting pipe, to which an air duct 8 is connected. Figures 1 and 2
The figure shows that one air hole is provided upstream or downstream of the ventilation fan 9, respectively, but at the same time one air hole 10 is provided upstream (i.e. near the first open end) and downstream (i.e. near the first open end) of the ventilation fan. , near the second open end).

According to FIG. 3, the air duct 8 has a protrusion 10
a is connected, and there is a filter 15 in it.
, the incoming and outgoing air, especially the outgoing air, is purified.

In FIG. 4, a slider 16 is shown as a throttle valve, and this slider 16 is connected to a bolt 17.
It is fixed to the air duct 8 through the elongated hole 18 in such a manner that all or part of the air hole 10 can be opened or closed. The strength of the airflow is thereby adjusted.

5a and 5b show a rotatable disk 19 as a throttle valve, which disk 19 is fixed to the air duct 8 via a projection 10a. By rotating the disc 19, the air hole 10 changes from the open state (FIG. 5a) to the half-open state (FIG. 5a).
Figure b).

What is shown in FIGS. 6a and 6b is a valve plate 21 that is suspended from a rotating shaft 20 as a throttle valve, and both sides of this valve plate 21 are biased by leaf springs 22 and 23, respectively. These leaf springs 22 and 23 are
It is fixed to the inner wall of the protrusion 10a. Projection part 10
A projection 2 is provided on the wall facing the free end of the valve plate 21 of a.
4 is arranged, and this protrusion 24 is, for example, a valve plate 21.
It has the function of blocking. FIG. 6a shows the state of the valve plate 21 when air from the outside air flows into the air duct 8 from the air hole 10;
According to figure b, air flows from air duct 8 to air hole 1.
It flows outward through 0. Leaf spring 22,2
3 is adjusted to weaken the force of the incoming or outgoing air moving the valve plate 21 in one direction or the other.

The airflow through the air holes 10 is adjusted by manually adjusting the position of the slider 16 or disc 19. It is also possible to automatically adjust the position of the slide 16, the disc 19 or the valve plate 21, for example in relation to the inflow of fiber material or the like.

In explaining the present invention, an example of a floc feeder having two tubes (an upper reserve tube and a lower supply tube) was shown, but the present invention is not limited to the form of this embodiment. do not have. It is also possible to use the invention in fiber feeding devices having only one feeding tube. This is because the fiber flock is guided by the air in the fine openings extending in the upstream direction of the flow.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the present invention device having an air hole between the air outlet of the air duct and the ventilation fan, and Fig. 2 is an explanatory diagram of the present invention device having the air hole above the floc filling area of the supply duct. , Figure 3 is an explanatory diagram of the air hole with a filter connected to the front stage, Figure 14 is an explanatory diagram of the slider added to the air hole, and Figures 5 a and b are the fully open state of the rotatable disk attached to the air hole. (Fig. 5a) and an explanatory diagram showing the half-open state (Fig. 5b). Figs. 6a and b show air flowing through a disk biased by a suspended spring attached to the air hole. FIG. 6 is an explanatory diagram showing the state in which air flows out (FIG. 6a) and the state in which air flows out (FIG. 6b). 1... Spare tube, 2... Supply tube, 3... Take-in roller, 4... Open roller, 5a, 5b...
...Drawer roller, 6...Press switch, 7a,
7b...Air outlet, 8...Air duct, 9...
Ventilation fan, 10...Air hole, 11a, 11b...Fiber flock, 12...Transfer pipe, 13a, 13b...
...Air distribution device, 14...Tin case, 15...
... Filter, 16 ... Slider, 17 ... Bolt, 18 ... Long hole, 19 ... Disk, 20 ... Air hole, 21 ... Valve plate, 22, 23 ... Leaf spring, 24
……protrusion.

Claims (1)

[Claims] 1. A supply tube 2 through which the fiber flock passes, the supply tube 2 having an open intake end 2a and air outlet ports 7a, 7b downstream of the end 2a; 2
a and the outlet 7a, 7b are connected together by an air duct 8 having a first open end 8a and a second open end 8b and a supply tube, the air outlet 7a, 7b, the duct 8 and the end 2a together define an air circulation path, within which a ventilation fan 9 is disposed to generate an air flow that circulates around the circulation path, and the circulation path Apparatus for delivering a layer of fiber flock, characterized in that it is a partially closed circuit with air branching means for allowing partial passage of air into or out of the channel, both at one location. 2. The air branching means consists of an air hole 10, which connects the ventilation fan 9 in the air duct 8 and the air duct 8.
A device for delivering a layer of fiber flock according to claim 1, characterized in that it is arranged between the first open end 8a of the fiber flock. 3. The air branching means consists of an air hole 10, which connects the ventilation fan 9 in the air duct 8 and the air duct 8.
A device for delivering a layer of fiber flock according to claim 1, characterized in that it is arranged between the second end 8b of the fiber flock. 4. The air branching means consists of a first air hole and a second air hole, the first air hole connecting the ventilation fan 9 of the air duct 8 and the first open end 8a of the air duct 8.
The patent is characterized in that the second air hole is arranged between the ventilation fan 9 in the air duct 8 and the second open end 8b of the air duct 8. An apparatus for delivering a fiber flock according to any one of claims 1 to 3. 5. Claims 1 to 4, characterized in that the air branching means comprises an air hole 10, which is arranged above the air outlet ports 7a, 7b in the supply tube 2. A device for delivering a layer of fiber flock according to any one of the preceding paragraphs. 6. A device for delivering a layer of fiber flock according to any one of claims 1 to 5, characterized in that a filter 15 is connected to the front stage of the air branching means 10, 10a. . 7. A device for delivering a layer of fiber flock according to any one of claims 1 to 6, characterized in that it is provided with a regulating member for regulating the flow of air through the air branching means. . 8. The control member according to any one of claims 1 to 7, characterized in that the adjustment member is provided with a variable throttle valve for changing the flow cross-sectional area of the air port 10. A device that delivers layers of fiber flock. 9. Any one of claims 1 to 8, characterized in that the throttle valve is provided with a slider 16 that is directly or indirectly fixed to the air duct 8 and cooperates with the air hole 10. A device for delivering the fiber flock according to item 1. 10. The throttle valve is provided with a suspended valve plate 21 which is fixed directly or indirectly to the air duct 8 and cooperates with the air hole 10. An apparatus for delivering the fiber flock according to any one of item 8. 11. Claims 1 to 8, characterized in that the throttle valve is provided with a rotatable disc 19 that is fixed directly or indirectly to the air duct 8 and cooperates with the air port 10. A device for dispensing a layer of fiber flock according to any one of the preceding paragraphs.