JPH05138078A - Jet speed adjustable slit nozzle - Google Patents

Abstract

PURPOSE:To make adjustable the velocity of a liquid spewed from a slit nozzle with a linear jet slit gap at any position in a nozzle longitudinal direction. CONSTITUTION:A movable plate 13 is arranged in a uniflux chamber R consisting of an upper nozzle member 11 and a lower nozzle member 12 as well as a jet orifice gap G. A slender straining plate 21 is installed in the middle of the movable plate 13 through a screw 18 and a pressing spring 22 is attached way deep in a lower nozzle member 12 at the backward part. Further, the rear end part of the movable plate 13 has a roller 23 which pressed down the movable plate 13 partially, moving in a nozzle longitudinal direction. If the movable plate 13 is locally pressed down to become bent by moving the roller 23 in the nozzle longitudinal direction, the sector spread degree of the jet nozzle gap G is adjusted, and subsequently, the velocity of a liquid can be changed locally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slit nozzle for injecting a fluid, and more specifically, it forms an elongated ejection orifice gap in a straight line, and the velocity of an ejection flow ejected from the slit nozzle is arbitrary in the nozzle longitudinal direction. The present invention relates to a jet nozzle capable of adjusting the ejection speed, which can be adjusted in the section.

[0002]

2. Description of the Related Art Slit nozzles that form a long and narrow jet opening gap are for cleaning a wide surface of a plate-like object,
Alternatively, when this surface is subjected to a chemical treatment, or a treatment such as surface property improvement, it is widely applied. In such a case, the jet pressure ejected from the slit nozzle impinges on the object surface, or Often, it is necessary to partially differ the speed at which the object surface is impacted.

For example, in the case of continuously applying hot-dip galvanizing to a strip-shaped steel sheet, the steel sheet 2 to be plated is first drawn into the hot-dip zinc bath 1 and then placed in the hot-dip zinc bath 1, as shown in FIG. In the bath, a pair of slit nozzles 3 are provided to face the upper surface of the steel plate 2 by turning the roll 4 to change the direction of the roll 4 and pull up the melted zinc in excess. Equipment is generally used that is blown off by the force of pressurized air or a fluid such as nitrogen ejected from the device to finish the required amount of adhesion, that is, the plating thickness.

In such hot dip galvanizing equipment,
The slit nozzle 3 is one of the most important devices, and its performance directly affects the uniformity of the plating film thickness and the beauty of the plated surface. Therefore, pay close attention to the structure of the slit nozzle 3. Have to pay. The structure of the tip of the slit nozzle 3 that has been generally used so far is shown in FIG.
In the cross-sectional view, there is a jet port 5 which is a slit-like jet port gap that is uniformly developed in the longitudinal direction of the nozzle 3, and the gap G of this jet port is set to 0.5 to 3 mm.

In such a case, if the gap G of the ejection port is constant in the longitudinal direction of the nozzle, the width direction of the steel plate 2 to be plated, that is, the slit nozzle 3 is larger than the surface of the steel plate 2 to be plated.
It is considered at first glance that a uniform plating thickness can be obtained because the excessively adhered zinc can be uniformly blown off by injecting a uniform jet flow in the longitudinal direction.
However, in reality, even if the fluid is jetted uniformly from the slit nozzle 3, the jet flow after jetting is non-steady and non-uniform at both edges of the steel sheet 2 to be plated, Also, the amount of molten zinc adhering to both edges of the steel sheet to be plated 2 and rising is larger than that of other portions, and further, it is difficult to blow off due to the temperature decrease of both edges. It is widely known that, as a result, the plating thickness within the range of 100 mm on both edges ends up being thicker than the other inner parts, resulting in a serious problem of significantly impairing quality and yield. ing.

In order to prevent such inconvenience, for example,
As shown in FIG. 13, the slit nozzle 3 having a length that covers a range wider than the width of the steel plate 2 to be plated, and the width above the slit nozzle 3 and at both edges of the steel plate 2 to be plated are provided. There is known a means for obtaining a uniform plating thickness by using a slit nozzle 4 which is a narrow subordinate of the above in combination, and performing two-stage blowoff of zinc at both edge portions. Fig. 14
As shown in FIG.
Is formed in a taper shape such that the gaps are gradually expanded from the inner side in the width direction to the outer sides at the portions located at both edges of the steel sheet 2 to be plated, and the amount of fluid ejected near both ends is changed. There is known a means for increasing the blow-off force of zinc at the edges to obtain a uniform plating thickness.

However, in the former means, the zinc scattered mainly due to the collision of the jet flow jetted from the subordinate slit nozzle 4 having a narrow width on the surface of the steel sheet 2 to be plated becomes the main downward portion. Not only does this impinge on the slit nozzle 3 and adhere to it, which hinders the stable ejection of the slit nozzle 3, but also after the jet flow ejected from the slit nozzle 3 and the slit nozzle 4 collides with the steel sheet 2 to be plated. And the descending component flow of the jet flow from the slit nozzle 4 and the ascending component flow of the jet flow from the slit nozzle 3 collide and interfere with each other, which makes adjustment and maintenance extremely complicated, and Is a boundary portion located at the end of the upper slit nozzle 4, that is, a boundary between a portion blown down in two steps and a portion blown down in one step. In it will drop conditions are different blowing clearly a disadvantage such as it is impossible to obtain a uniform plating thickness, especially in this part.

Further, in the latter means, the width of the steel sheet 2 to be plated, which is frequently changed, cannot be dealt with at any time. Therefore, the slit nozzle 3 must be replaced every time the width is changed. In addition to having the disadvantage of having to keep the same, and reducing the production efficiency due to replacement work, it is almost impossible to match the taper of the gap to make the plating thickness uniform. Is so difficult,
Therefore, there is a drawback that it is difficult to obtain a plating thickness with high uniformity.

Further, the major problem of the latter means is that even if the gap between the jet outlets is widened, the force for blowing off zinc is not so strong, so that the amount of jetted fluid is increased unnecessarily. Not only does it increase the energy cost, but the amount of jetted fluid at both edges is very large, so the amount of fluid that flows downward along the surface of the steel sheet 2 to be plated inevitably increases. This increases the force of tapping the surface of the molten zinc in the molten zinc bath 1, resulting in a large amount of scattered molten zinc on the surface of the molten zinc, for example, at a high speed when the supply fluid pressure must be increased. Or, there is a drawback that the operation for obtaining a thin plating thickness is impossible.

In order to solve such a problem, it is effective to change the gap between the respective portions of the fluid ejection port. As an attempt for this, for example, Japanese Patent Laid-Open No. 51-87435 has been proposed.
Japanese Patent Publication No. 60-43909, etc. have been proposed. Among the prior arts proposed in the above publication, the former variable jet nozzle slit nozzle is an upper flexible lip made of a thin flexible member and a lower fixed lip having a thick fixed reference surface. The nozzle opening is formed by and the nozzle opening is deformed in the longitudinal direction by adjusting the flexible lip to adjust the plating thickness.

In the prior art, the gap between the gas ejection ports is adjusted by moving the upper flexible lip up and down with a rack. However, in such a technique, since the flexible lip is thin, this is not possible. There are problems that it is easily affected by thermal deformation due to the ambient temperature, that the flexible lips are easily vibrated by the ejection of gas, and that it is difficult to make smooth gaps in the nozzle longitudinal direction. Therefore, there is a drawback in that accurate and stable adjustment of the ejection amount cannot be easily performed.

The latter variable jet nozzle slit nozzle proposed to eliminate such drawbacks is a combination of an upper block and a lower block of a long member to form a gas blowing slit along the plate width direction. In the slit nozzle, the lower block is a fixed side and the upper block is a movable side and both are made of a rigid body, and the nozzle upper block is pressed upward or downward by a power cylinder at a plurality of positions in the longitudinal direction of the rigid upper block. The gap of the gas blowing slit is variable in the plate width direction.

However, in this prior art, the upper horizontal frame and the lower horizontal frame for receiving the reaction force of the cylinder are extremely large in view of the force because the positions of their fulcrums are outside the entire length of the nozzle. In addition to requiring a strength member having a cross-sectional area, it is extremely difficult to accommodate them in terms of space. In addition, the large lower horizontal frame means that the secondary air flow along the lower surface of the nozzle is smooth. It has the drawbacks that it hinders the smooth flow, hinders uniform blow-down, and causes abnormal splash generation and splash adhesion.

Further, the common problems of both the above-mentioned techniques are that the upper flexible lip or the nozzle upper block is
These racks or cylinders are placed above and below to raise and lower, but in general, it is necessary to place a support roll for holding the position of the steel sheet to be plated in the immediate vicinity above the nozzle. The structure in which the rack or the cylinder is arranged above is difficult to be practically applied in a space condition.

As described above, the variable nozzle slit nozzle also has drawbacks, and since no other reliable means has been put to practical use, the nozzle opening 3a of the slit nozzle 3 described with reference to FIG. 14 is unsatisfactory. In reality, it is necessary to rely on a taper shape in which both edges are gradually expanded from the inner side in the width direction toward the outer sides, and an effective means is desired.

[0016]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and provides an ejection speed adjusting type slit nozzle capable of adjusting the slit-like gap of the slit nozzle at any position in the longitudinal direction of the nozzle. The purpose is that.

[0017]

FIG. 11 shows the relationship between the gap G at the ejection port of the slit nozzle 3, the pressure P of the fluid supplied to the slit nozzle, the finish plating thickness T, etc.
This is an example of actual measurement with other conditions kept constant and displaying the result in a graph. From this graph, it is apparent that the plating thickness T hardly changes even when the gap G at the ejection port of the slit nozzle changes, in other words, when the ejection amount of the fluid increases or decreases. On the other hand, when the pressure P of the fluid supplied to the slit nozzle changes, in other words, when the ejection speed of the fluid (determined by the pressure of the supplied fluid) changes, the plating thickness T surely changes accordingly. It is clear. That is, it is effective to control the speed of the fluid ejected from the slit nozzle, rather than controlling the gap G of the ejection port of the slit nozzle, in order to obtain the required finished plating thickness T.

Needless to say, the velocity of the jet flow ejected from the slit nozzle can be easily changed by changing the pressure of the fluid supplied to the slit nozzle.
It is actually extremely difficult to make the supply pressure different at a smooth change rate in view of the structure of the slit nozzle.

Therefore, the present inventor has paid attention to the above-mentioned actual measurement results and studied based on the above-mentioned problems, and as a result, has developed a new slit nozzle capable of partially changing the velocity of the jet flow. succeeded in. According to the present invention, an upper nozzle piece and a lower nozzle piece having a rear end portion fastened so as to tie to the upper nozzle piece and a lower nozzle piece that forms a straight elongated slender outlet gap that serves as a fluid discharge passage are formed. In the slit nozzle, the degree of divergence of the jet gap from the fluid rectifying chamber side toward the outlet can be partially adjusted in each portion in the nozzle longitudinal direction perpendicular to the jet direction, and the jet speed of the fluid is changed in each portion in the nozzle longitudinal direction. It is a jet nozzle for adjusting the ejection speed, which is characterized in that it is configured so as to be possible.

According to the present invention, between the upper nozzle piece and the lower nozzle piece, the upper surface forms the ejection opening gap with the lower surface of the upper nozzle piece, and the lower surface is provided at the tip of the lower nozzle piece. A movable plate supported by the fulcrum projection and extending from the front end of the ejection opening gap to the rear end of the flow regulating chamber,
By tilting the movable plate with the fulcrum protrusion as a fulcrum, the degree of the divergence toward the outlet from the flow straightening chamber side can be partially adjusted in each part in the nozzle longitudinal direction.

The movable plate has a structure in which a cutout is formed in the rear portion of the flow regulating chamber at a required pitch in the longitudinal direction of the nozzle, and the cutout portion of the movable plate is partially bent and deformed to tilt. Is preferred. Further, between the upper nozzle piece and the movable plate, the rear end portion of the movable plate is arranged to be partially pushed down from the upper surface at an arbitrary set position in the nozzle longitudinal direction by the movement from the lateral outside through the rod. It can be equipped with rollers, and further, the middle of each notch of the movable plate and the lower nozzle piece are connected via a screw, and a push spring is provided between the rear end of each notch and the lower nozzle piece. It is preferable to have a structure in which

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 7 is a perspective view showing the slit nozzle of the present invention. 8 is a plan view of FIG. 7 viewed from the direction of arrow A, and FIG. 9 is a plan view of FIG. 7 viewed from the direction of arrow B. As shown in FIGS. 7 to 9, the slit nozzle of the present invention mainly comprises a slit nozzle body 10 and a header 16. Reference numeral 29 denotes a rod inserted from the outside of the nozzle body 10 to the inside, and 16a denotes a fluid supply pipe.

FIG. 3 is a horizontal cross sectional view taken along the line CC of FIG. 9, and FIG. 4 is a vertical cross sectional view taken along the line DD of FIG. 1 is a vertical sectional view taken along the line EE of FIG. 8, and FIG. 2 is a vertical sectional view taken along the line FF of FIG. As shown in FIGS. 1 and 2, the slit nozzle body 10 is composed of main components such as an upper nozzle piece 11, a lower nozzle piece 12, a movable plate 13, and the like. The upper nozzle piece 11 and the lower nozzle piece 12 are fastened to each other by bolts 14 at their rear ends in a state of facing each other so as to be entangled.
11, the lower nozzle piece 12 and the header 16 are integrally connected by a bolt 15. Between the upper nozzle piece 11 and the lower nozzle piece 12, a rectifying chamber R for adjusting the flow of fluid is arranged.
Is formed, and a linear elongated jet outlet gap G that serves as a fluid discharge passage is formed.

As described above, the header 16 for receiving the fluid supplied from the outside and uniformly distributing the fluid in the longitudinal direction of the nozzle is attached to the upper surface of the upper nozzle piece 11 by the bolt 15. The fluid supplied through the supply port 16a therein has a plurality of vent holes 16b formed in the lower surface portion thereof and at a required pitch and diameter in the longitudinal direction,
And the upper nozzle piece 11 provided so as to communicate with this.
The air is introduced into the rectification chamber R through the ventilation holes 11a and the like. Rectifying room R
A movable plate 13 is provided in the inside of this, at a required pitch and at the front (left) so that it can be easily bent to partially make different states in the longitudinal direction. A notch 13a having a length to leave a part is provided. Also,
On the lower surface of the movable plate 13 near the tip, the lower nozzle piece 12
Groove that fits on the fulcrum protrusion 12a protruding on the upper surface of the tip of the
13b is engraved, and the movable plate 13 can perform a tilting motion substantially with the fitted portion as a fulcrum. Further, the movable plate 13 is arranged such that the front upper surface thereof forms a required gap G between the tip upper surface portion and the tip lower surface portion 11b of the upper nozzle piece 11 for the fluid to pass therethrough.

Female screws 17 are provided in the up-down direction corresponding to the movable plates 13 divided by notches near the tip of the lower nozzle piece 12, and the base screw 19 of the screw 18 is provided there through a seal seat 32. It is screwed and fixed. Further, a tip screw 20 is provided at the tip of the screw 18, and this tip screw 20 portion penetrates loosely into a tap hole 30 provided in each movable plate 13.

The tip screw 20 of the screw 18 is an elongated restraint plate.
It is screwed into a female screw 31 arranged in the longitudinal direction of 21. How much the screw 18 is screwed into the female screw 31 is the movable plate 13
The rear end portion 13c is adjusted so as to slightly contact the corner portion 11c of the upper nozzle piece 11. In the vicinity of the rear (right side) of the movable plate 13, each of the pieces separated by the notch 13a always exerts a push-up force by the push springs 22 provided in the respective holes 12d formed in the lower nozzle piece 12. And therefore the rear end of the movable plate 13 unless there is a pressing force.
13c is held in a fixed position in contact with the lower surface of the corner portion 11c of the upper nozzle piece 11 (see FIG. 2). Thus, the surface 11b of the tip of the upper nozzle piece 11 facing the movable plate 13 is
When the rear end portion 13c of the movable plate 13 is in contact with the corner portion 11c of the upper nozzle 11, when the rear end portion 13c is pushed down when the rear end portion 13c is pushed down as shown in FIG. As shown in FIG. 6, the required angle is set so as to be parallel to the outlet, and the fluid has a gap G formed between the surface 11b of the upper nozzle piece 11 and the upper surface of the movable plate 13.
It is jetted out from the rectification chamber R through the.

The movable plate 13 tilts around the fulcrum projection 12a, and the position of the fulcrum projection 12a is the starting point 11d of the surface 11b.
Since it is positioned between the end point 11e and the end point 11e, the dimension H1 of the entrance side portion, the dimension H2 of the exit side portion of the gap G in the state shown in FIG. There is a relationship of H2>H3> H1 between the dimensions H3 and the like of the gap G. When the fluid is ejected from the rectifying chamber R to the outside, its flow rate is
In the state shown in FIG. 5, it is determined by the dimension H1, and in the state shown in FIG. 6, it is determined by the dimension H3. In any state, if the pressure of the supplied fluid is the same, the dimensions H1 and H3 are passed. The fluid flow velocities at the same time are the same. However, in the case of the state of FIG. 5, since the gap G gradually and smoothly expands toward the outlet side, the velocity of the fluid passing through the gap G becomes slower in inverse proportion to the gap size as it goes to the outlet side. .. Such a phenomenon is a phenomenon that occurs because the amount of fluid passing through the gap G must be constant in any other portion and the product of the flow path area and the velocity must be constant. It is well known.

That is, at the outlet of the slit nozzle body 10, the ejection speed of the fluid is slower in the state of FIG. 5 than in the state of FIG. 6 even if the fluid pressure in the flow regulating chamber R is the same. .. The relationship is that when the flow velocity at H1 is V1, the flow velocity V2 at H2 is approximately H1 / H2 times. From this, it is clear that the ejection speed of the fluid can be arbitrarily changed by tilting the movable plate 13.

As shown in FIGS. 3 and 4, the movable plate 13 is
The rear portion 13c is tilted by being pressed by the rollers 23, 24, 25. Colo 23 here
Directly contacts the rear upper surface of the movable plate 13, and the rollers 24,
And the roller 25 are in contact with the lower surface 11f of the upper nozzle piece 11, and by appropriately selecting the dimensions from the upper end to the lower end when these three rollers are combined,
The movable plate 13 is tilted by a required amount by widening the gap between the lower surface 11f and the rear upper surface of the movable plate 13.

In this case, in the portion where the movable plate 13 is pushed down by the roller 23, the movable plate 13 is separated from the lower surface of the elongated plate 21 supported by the screw 18, but the movable plate 13 which is not pushed down is adjacent to the movable plate 13. At 13, the action of the push spring 22 brings the movable plate 13 into contact with the elongated plate 21 and receives the pushing force. Therefore, the fulcrum protrusion 12a of the lower nozzle piece 12 does not come off from the groove 13b of the movable plate 13.

The rollers 23, 24, 25 and the like are integrally combined in a state of being rotatably supported by pins 27 fixed to a support frame 26. Then, the nozzle plate 10 is penetrated through the support plate 26 through a closing plate 28 provided to prevent the fluid from leaking from the end portion in the longitudinal direction of the pressure regulating chamber R.
One end of a rod 29 inserted along the longitudinal direction is fixed inside, and by inserting and removing this rod 29, the rollers 23, 24, 25, etc. are arranged along the longitudinal direction inside the nozzle body 10. Moving. The other outer end of the rod 29 is transmission-coupled to an appropriate actuator (not shown) so that the roller 23 or the like automatically matches the position where the movable plate 13 should tilt, that is, the edge of the steel plate to be plated. It is like this.

In the slit nozzle body 10 having such a structure, in the embodiment, the gap G is defined by the dimensions H1, H2 at both ends.
The other H3s were set to 0.8 mm, 1.6 mm and 1.2 mm and used. 10 and 11 are graphs showing the plating thickness distribution in the width direction of the steel sheet to be plated obtained as a result of manufacturing a plated product in a continuous hot-dip galvanizing line, and FIG. That is, as shown in FIG. 14, a method in which the gap G of the slit-shaped ejection port of the slit nozzle 3 is tapered so that the portions located at both edges of the steel plate 2 to be plated gradually expand from the central portion toward both sides. And the results obtained by the examples of the present invention are shown in FIG.

As is clear from these results, when the slit nozzle body 10 of the present invention is used, it is apparent that a product having a uniform plating thickness in the width direction can be obtained.
In the embodiment of the present invention, the example in which the ejection speed of a part of the slit nozzle in the longitudinal direction is adjusted has been described.
If the movable plate 13 is tilted uniformly in the longitudinal direction, it is possible to adjust the ejection speed uniformly in the longitudinal direction without changing the fluid supply pressure.

[0034]

As described above, by adopting the present invention, not only a high-quality plated steel sheet with an extremely uniform plating thickness can be obtained, but also the amount of fluid to be supplied can be reduced. Cost reduction can be achieved, and further, a product having a thin plating film thickness can be produced at a high speed, which can greatly contribute to an increase in productivity, and its industrial value is great.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a slit nozzle structure of the present invention as viewed in the direction of arrows EE in FIG.

FIG. 2 is a cross-sectional view showing the slit nozzle structure of the present invention as seen from the arrow FF of FIG.

FIG. 3 is a cross-sectional view showing the slit nozzle structure of the present invention as seen in the direction of arrows CC in FIG.

FIG. 4 is a cross-sectional view showing the slit nozzle structure of the present invention as viewed in the direction of arrows D-D in FIG.

FIG. 5 is an explanatory view showing in cross section the situation when the gap in the slit nozzle of the present invention is tapered.

FIG. 6 is an explanatory view showing in cross section the situation when the gap in the slit nozzle of the present invention is made parallel.

FIG. 7 is a perspective view showing a slit nozzle of the present invention.

FIG. 8 is a plan view showing the direction of arrow A in FIG.

9 is a front view showing the arrow B of FIG. 7. FIG.

FIG. 10 is a line graph showing the distribution of plating thickness in the width direction of the steel sheet according to the conventional means and the present invention.

FIG. 11 is a line graph showing the relationship between the ejection opening gap G and the plating thickness.

FIG. 12 is a perspective view showing a conventional example.

FIG. 13 is a perspective view showing another conventional example.

FIG. 14 is a perspective view showing still another conventional example.

FIG. 15 is a partial cross-sectional view showing a tip portion of a conventional slit nozzle body.

[Explanation of symbols]

 10 Slit nozzle body 11 Upper nozzle piece 12 Lower nozzle piece 13 Movable plate 14 Bolt 15 Bolt 16 Header 17 Female screw 18 Screw 19 Root screw 20 Tip screw 21 Slender plate 22 Push spring 23 Roller 24 Roller 25 Roller 26 Support frame 27 Pin 28 Closed Plate 29 Rod 30 Tap hole 31 Female thread 32 Seal seat

Claims (5)

[Claims] 1. A fluid flow straightening chamber and a linear elongated jet opening gap serving as a fluid discharge passage are formed by an upper nozzle piece and a lower nozzle piece having a rear end portion fastened so as to be wrapped around the upper nozzle piece. In the slit nozzle to be formed, the degree of divergence of the ejection opening gap from the fluid flow rectifying chamber side toward the outlet is partially adjustable in each portion in the nozzle longitudinal direction perpendicular to the ejection direction, and the ejection speed of the fluid in each portion in the nozzle longitudinal direction. A jet nozzle with adjustable ejection speed, characterized in that it can be changed. 2. A fulcrum protrusion between the upper nozzle piece and the lower nozzle piece, the upper surface of which forms an ejection opening gap between the upper nozzle piece and the lower surface of the upper nozzle piece, and the lower surface of which is provided at the tip of the lower nozzle piece. A movable plate which is supported by the movable plate and extends from the front end portion of the ejection opening gap to the rear end portion of the flow regulating chamber, the ejection opening gap is inclined from the flow regulating chamber side by tilting the movable plate with a fulcrum projection as a fulcrum. 2. The ejection velocity adjusting slit nozzle according to claim 1, wherein the degree of divergence toward the end is partially adjustable in each part in the nozzle longitudinal direction. 3. The movable plate has a structure in which a notch is formed at a rear end of the flow regulating chamber at a predetermined pitch in the nozzle longitudinal direction, and the notch of the movable plate is partially bent and deformed to tilt. The jet nozzle with adjustable ejection speed according to claim 2, which is configured. 4. The rear end portion of the movable plate is partially pushed down from the upper surface at an arbitrary set position in the nozzle longitudinal direction by a movement between the upper nozzle piece and the movable plate via a rod from the lateral outside. 2. The rollers arranged as described above.
Alternatively, the ejection speed adjusting type slit nozzle according to claim 3. 5. A push spring is installed between the rear end of each cutout portion of the movable plate and the lower nozzle piece, and a screw is passed upward in the middle of the lower nozzle, and the screw is passed through each screw of the movable plate. While penetrating loosely in the tap hole provided in the notch,
The ejection speed adjusting slit nozzle according to claim 4, wherein an elongated constraining plate is screwed to the tip of the screw.