CN114480995A - Airflow nozzle shielding device - Google Patents
Airflow nozzle shielding device Download PDFInfo
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- CN114480995A CN114480995A CN202011273483.4A CN202011273483A CN114480995A CN 114480995 A CN114480995 A CN 114480995A CN 202011273483 A CN202011273483 A CN 202011273483A CN 114480995 A CN114480995 A CN 114480995A
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 158
- 239000010959 steel Substances 0.000 claims abstract description 158
- 229910052751 metal Inorganic materials 0.000 claims description 49
- 239000002184 metal Substances 0.000 claims description 49
- 230000001681 protective effect Effects 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 25
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052725 zinc Inorganic materials 0.000 abstract description 13
- 239000011701 zinc Substances 0.000 abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 5
- 238000005507 spraying Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention relates to an airflow nozzle shielding device which is distributed on two sides of a knife beam of an air knife and comprises two micro motors and a gear box, wherein the two micro motors are respectively connected with the gear box to be used as driving, the gear box is divided into a box seat and a box cover, box seat screws are fixed on the side wall of the knife beam, and the micro motors are arranged in the knife beam; through the airflow shielding device and the control method, nitrogen is saved, cost is reduced, and the distance between the steel needles on two sides and the edge of the strip steel is kept at 50mm, so that the spraying of the airflow does not influence the zinc layer on the edge of the strip steel, and the quality of the zinc layer on the edge of the strip steel is ensured.
Description
Technical Field
The invention relates to a shielding device, in particular to an airflow nozzle shielding device, and belongs to the technical field of machinery.
Background
When the cold rolling aluminum-zinc plating unit produces thin strip steel with the specification of 0.28mm, the strip steel passes through a zinc liquid coating, and in order to ensure the surface quality of the strip steel, an air knife on a zinc pot is blown by nitrogen to reduce the oxidation phenomenon of a zinc layer and reduce patterns on the zinc layer. Because the width of the air knife nozzle is 1600mm, the maximum specification width of the strip steel is 1250mm, the minimum width of the strip steel is 700mm, and the cost of nitrogen is higher than that of air, in order to save nitrogen and reduce cost, after the nitrogen is put into use, a shielding device capable of automatically moving needs to be installed in the air knife airflow nozzle, the device is arranged along the long and narrow airflow nozzle, the shielding device is attached between the upper knife lip and the lower knife lip of the air knife by utilizing airflow, and the part of the air knife nozzle, which is larger than the width of the strip steel, can be shielded, so that the consumption of nitrogen is reduced.
By search, chinese patent CN202010097361.8 "an air knife control device and method for hot dip galvanizing unit" describes that the thickness of the galvanized layer is controlled by spraying heated nitrogen from the air knife nozzle, and the nitrogen flow scrapes off the excess zinc on the surface of the strip steel. The technical scheme provides an airflow nozzle shielding device and a method, wherein a PLC is used for controlling different strip steel width values sent by an upper computer to set the walking distance of the airflow nozzle shielding device, the shielding device is driven by two micro motors which are respectively connected with a gear box, a spring is sleeved outside a steel wire rope, the spring and the steel wire rope are installed in a groove of the gear box, the gear rotates to drive the spring to move, the steel wire rope is wrapped by the spring and also moves along, the foremost end of the steel wire rope is connected with a steel needle, the steel wire rope and the steel needle can move forwards and backwards in a gap of an air knife nozzle, and the airflow pressure is blown to enable the shielding device to be attached between an upper knife lip and a lower knife lip of an air knife so as to achieve the purpose of shielding the airflow. Therefore, the technical scheme is different from the technical scheme of the case in structure and use method.
Disclosure of Invention
The invention aims at the problems in the prior art, and provides an airflow nozzle shielding device, which overcomes the defects in the prior art and comprises two micro motors arranged on two sides of a knife beam of an air knife and respectively connected with a gear box for driving, a spring sleeved outside a steel wire rope, the spring and the steel wire rope are arranged in a groove of the gear box, a gear rotates to drive the spring to move, the steel wire rope is wrapped by the spring to move along with the spring, the foremost end of the steel wire rope is connected with a steel needle, the steel wire rope and the steel needle can move forwards and backwards in a nozzle gap of the air knife, the PLC controls different strip steel widths issued by an upper computer, the traveling distance of the shielding device is set, a motor encoder carries out position feedback, the end part of the steel needle and the edge part of the strip steel are ensured to keep a fixed distance, and the steel wire rope of the shielding device and the connected steel needle are attached between an upper knife lip and a lower knife lip of the air knife under the pressure of the air knife so as to achieve the purpose of shielding device The purpose of blocking the air flow. Through the airflow shielding device and the control method, nitrogen is saved, cost is reduced, and the distance between the steel needles on two sides and the edge of the strip steel is kept at 50mm, so that the spraying of the airflow does not influence the zinc layer on the edge of the strip steel, and the quality of the zinc layer on the edge of the strip steel is ensured.
In order to achieve the purpose, the technical scheme of the invention is that the airflow shielding devices are distributed on two sides of the knife beam of the air knife, two micro motors are respectively connected with a gear box for driving, the gear box is disc-shaped and is vertically arranged, the gear box is divided into a box cover and a box seat, box seat screws are fixed on the side wall of the knife beam, the micro motors are arranged in the knife beam, and a motor shaft extends out of the wall of the knife beam and passes through a central hole of the box seat of the gear box; a first gear is connected to the motor shaft, the diameter of the first gear is 26mm, the first gear penetrates through the central hole of the middle disc, the first gear is provided with 9 teeth, the tooth pitch is 5mm, and the tooth height is 5 mm; a gap is reserved between the first gear and a central hole of the middle disc, the middle disc falls in the gear box base, the thickness of the middle disc is 12mm, the diameter of the disc is 110mm, an arc-shaped groove with the depth of 7mm is formed in the side vertical face of the circular edge of the middle disc, a spiral groove is formed in the groove, the spiral direction of the spiral groove is the same as that of a spiral steel wire spring with the diameter of 7mm, and the steel wire spring falls on the spiral groove in the arc-shaped groove; three upright columns are fixed on the circumference of which the center on the surface of the middle disc takes 40mm as the radius of the circle, the three upright columns are arranged in an equilateral triangle, a second gear is sleeved on each upright column, the diameter of the second gear is 60mm, the second gear is provided with 27 teeth, the tooth pitch is 5mm, and the tooth height is 5 mm; the height of the gear connected on the motor shaft is higher than that of the middle disc, and the gear is meshed with the two gears mounted on the upright post of the middle disc.
The depth of the inner part of the gear box cover is 15mm, 63 teeth are arranged on the circumference of the inner part of the gear box cover, the gear box cover is ensured to be covered on the box base, and the three second gears on the middle disc in the box base are fully meshed with the teeth in the box cover.
A steel wire spring is arranged in the arc-shaped groove of the side vertical surface of the round edge of the middle disc, and the spring falls on the spiral groove in the arc-shaped groove; the steel wire spring is wound along the arc-shaped groove of the middle disc in the gear box and then enters and exits in the upper and lower circumferential tangential directions of the middle disc; a guide protecting sleeve is respectively arranged in the gear box in the upper and lower circumferential tangential directions of the middle disc, and the steel wire spring penetrates out of the gear box along the guide protecting sleeve and enters into a protecting sleeve outside the gear box; the protective sleeve at the upper end of the gear box in the horizontal direction is 1100mm, and the end part of the sleeve is provided with a hoop fixed on the knife beam; the protective sleeve at the lower end of the gear box in the horizontal direction is 1800mm m, and the end part of the sleeve is connected and fixed on the side surface of the air knife nozzle cavity through a quick connector.
The steel wire spring is internally penetrated with a steel wire rope with the diameter of 4mm, the steel wire spring is 1500mm in length, the steel wire rope is 2700mm in length, the front end part of the steel wire rope close to the side of the air knife nozzle is welded with a threaded sleeve, a stainless steel metal strip with the diameter of 3mm is screwed into the threaded sleeve, and the stainless steel metal strip is adopted.
The shielding device of the air nozzle adopts a steel wire rope flexible body penetrating in a steel wire spring as a driving main body, and aims to realize small occupied volume of the device, installation can be carried out by utilizing a three-dimensional space position, over a zinc pot, fixation of an over-sized facility is not allowed, particularly, the size of an air knife beam body is small, the transmission side and the working side of the air knife beam are not fixed in position and are too close to the zinc pot downwards, and high-temperature radiation is large, so that the steel wire rope flexible body is adopted.
The metal strip is cylindrical, the length of the metal strip is 500mm, the air knife is 1600mm, the minimum width of the strip steel specification is 800mm, and the air knife lips on two sides of the strip steel are 400mm, so that the metal strip moves along with the steel wire rope, the maximum distance of the metal strip entering the cavity of the air knife is 400mm, the metal strip does not completely enter the cavity of the air knife, and friction caused by the fact that the steel wire rope enters the inner side of the knife lip of the cavity or foreign matters are brought into the cavity is reduced.
The head of the metal strip is conical, the gap between the conical tip and the upper surface of the lower knife lip of the inner cavity of the knife lip is 1mm, when the head of the metal strip connected with the steel wire rope is adjusted and positioned at the zero position of the shielding device, the head of the metal strip is positioned at the position which penetrates out of the side vertical surface of the cavity of the air knife by 2mm, and the purpose is that the head of the metal strip of the shielding device penetrates out of the side vertical surface of the cavity of the air knife by 2mm because the head of the metal strip of the shielding device with the thickness of 0.5mm stays at the leftmost end or the rightmost end of the cavity of the air knife and is better inserted into the inner cavity of the air knife when the head of the metal strip is stopped, the head of the metal strip just falls on the upper part of the cleaning device, the conical tip of the metal strip and the upper surface of the lower knife lip have a gap, so that the metal strip can effectively avoid the thickness of a thin steel sheet cleaned by the knife lip cleaning device arranged between the upper knife lip and the lower knife lip of the air knife when moving along with the steel wire rope, the metal strip is ensured to pass in and out between the upper knife lip and the lower knife lip without being blocked.
The lower knife lip of the inner cavity of the air knife is horizontally arranged, the inner side of the lip of the upper knife lip is arc-shaped, and when the gap between the upper knife lip and the lower knife lip is adjusted, the gap between the edges of the upper knife lip and the lower knife lip, namely the opening degree of the knife lip, is 1.4mm at most and 1.1mm at least; a stainless steel metal strip with the diameter of 3mm clings to a space formed by the inner sides of the upper and lower knife lips to move back and forth under the pressure of air jet;
the steel wire spring is sleeved on the steel wire rope, the end parts of the steel wire spring and the steel wire rope are aligned, the steel wire spring and the steel wire rope penetrate into a protective sleeve in the horizontal direction at the upper end of the gear box and are aligned with the end part of the sleeve, the sleeve is fixed on the knife beam by the clamp, the positions of the steel wire spring and the steel wire rope at the moment are the original positions of the shielding device, when the shielding device is withdrawn for use, the PLC controls the motor to run, a gear on a motor shaft in the gear box drives three gears to run simultaneously, the steel wire rope and the steel wire spring synchronously move due to the fact that internal teeth on the gear box cover are fixed, the middle disc is driven to rotate by the rotation of the three gear teeth, the spring groove in the middle disc groove drives the steel wire spring to move, and when the steel wire rope moves to a fixed port, the PLC calculates the distance to a stop position, and the motor stops running; when the shielding device is put into use, the PLC controls the motor to operate in the forward direction, the gear on the motor shaft in the gear box drives the three gears to operate simultaneously, the spring groove in the groove of the middle disc drives the steel wire spring to move, the three gears drive the middle disc to rotate, the middle disc drives the steel wire rope to move, the purpose of the movement of the three gears is the simultaneous rotation of the three gears, the simultaneous stress can ensure the synchronous and stable rotation of the middle disc, the middle disc drives the spring to operate more stably, the phenomenon of speed inconsistency can not occur, the spring and the steel wire rope can keep synchronous consistency, the spring and the steel wire rope can not be staggered, one long inconsistent phenomenon occurs when the gear is stopped; at this moment, the steel wire rope and the metal strip at the end part of the steel wire rope move in the air knife nozzle cavity in the protective sleeve in the horizontal direction of the lower end of the gear box, when the PLC detects that the end part of the metal strip is away from the strip steel width by 50mm, the motor stops running, the metal strip stops at the position, strong air flow presses the metal strip between the inner sides of the upper knife lip and the lower knife lip, and the purpose of shielding nitrogen injection is achieved, the strip steel width is away from the strip steel width by 50mm, so that the distance between the shielding device and the strip steel can be kept by 50mm, the stability of the air flow at the edge part of the strip steel can be ensured, the phenomenon that the deviation of the strip steel plate shape occurs occasionally is reduced, the quality of a coating layer is influenced, the strip steel width is the specification and size issued by an upper computer, and 50mm is the distance which can be set by the PLC and can be adjusted according to needs.
Compared with the prior art, the invention has the advantages that the air flow nozzle shielding devices in the technical scheme are arranged on two sides of the air knife beam, when in production and operation, strip steel passes through the middle of the air knife, the two sides of the air knife beam on the upper surface of the strip steel and the two sides of the air knife beam on the lower surface of the strip steel are respectively provided with the air flow shielding devices, and the shielding distances are controlled by the PLC according to the width of the strip steel for synchronous use. The shielding device for the air flow nozzle is simple in structure and convenient to operate, reduces consumption of nitrogen, and can ensure that the quality of the edge of the strip steel is not influenced.
Drawings
Fig. 1 is a schematic view of a gear box.
Fig. 2 is a schematic view of a gear box installation.
In the figure: 1-a gear box base; 2-motor shaft; 3-gear one; 4-middle disc; 5-a wire spring; 6-upright post; 7-gear two; 8-guiding sheath pipes; 9-a casing card; 10-a sleeve clamp seat; 11-protective sleeve at upper end of gear box; 111-a clamp; 12-a protective sleeve at the lower end of the gear box; 121-a quick coupling; 13-gearbox cover; 14-internal teeth; 15-fixing the lug; 16-air knife beam; 17-air knife lip cavity.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1, as shown in fig. 1-2, the technical solution of the air flow nozzle shielding device of this embodiment is that an air flow shielding device is distributed on both sides of a knife beam 16 of an air knife, and two micro motors are respectively connected to a gear box for driving, the gear box is disc-shaped in appearance and is vertically placed, the gear box is divided into two parts, namely a box base 1 and a box cover 13, a box base screw is fixed on the side wall of the knife beam 16, the micro motor is installed inside the knife beam, and a motor shaft 2 extends out of the knife beam wall and passes through a central hole of the box base of the gear box; a gear 3 is connected on the motor shaft 2, the diameter of the gear is 26mm, the gear penetrates through a central hole of the middle disc 4, the gear 3 is provided with 9 teeth, the tooth pitch is 5mm, and the tooth height is 5 mm; a gap is reserved between the gear and a central hole of the middle disc, the middle disc 4 falls in the gear box base 1, the thickness of the middle disc is 12mm, the diameter of the disc is 110mm, an arc-shaped groove (not shown in the figure) with the depth of 7mm is formed in the side vertical surface of the circular edge of the middle disc, a spiral groove (not shown in the figure) is formed in the groove, the spiral direction of the spiral groove is the same as the spiral direction of a spiral steel wire spring 5 with the diameter of 7mm, and the steel wire spring falls on the spiral groove in the arc-shaped groove; three upright posts 6 are fixed on the circumference of which the center on the surface of the middle disc 4 takes 40mm as the radius of a circle, the three upright posts are arranged in an equilateral triangle, a gear 7 is sleeved on each upright post, the diameter of the gear is 60mm, the gear is provided with 27 teeth, the tooth pitch is 5mm, and the tooth height is 5 mm; the gear 3 connected with the motor shaft 2 is higher than the middle disc 4 and is meshed with three gears 7 arranged on a middle disc upright post 6;
the depth of the inside of the gearbox cover 13 is 15mm, 63 teeth are arranged on the circumference of the inside of the gearbox cover, the gearbox cover is ensured to be covered on the box base, and three gears 7 on a middle disc in the box base are fully meshed with the internal teeth 14 in the box cover;
a steel wire spring 5 is arranged in the arc-shaped groove of the side vertical surface of the round edge of the middle disc, and falls on a spiral groove (not shown in the figure) in the arc-shaped groove; the steel wire spring 5 is wound along the arc-shaped groove of the middle disc in the gear box and then enters and exits in the upper and lower circumferential tangential directions of the middle disc; the upper and lower circumferential tangential directions of the middle disc 4 in the gear box are respectively provided with a guide protecting sleeve 8, and the steel wire spring penetrates out of the gear box along the guide protecting sleeve and enters into a protecting sleeve outside the gear box; the protective sleeve 11 at the upper end of the gear box in the horizontal direction is 1100mm, and the end part of the sleeve is provided with a hoop 111 fixed on the knife beam; the protective sleeve 12 at the lower end of the gear box in the horizontal direction is 1800mm m, and the end part of the sleeve is provided with a quick connector 121 which is connected and fixed on the side surface of the air knife nozzle cavity;
the steel wire spring is internally penetrated with a steel wire rope (not shown in the figure) with the diameter of 4mm, the steel wire spring 5 is 1500mm, the steel wire rope is 2700mm, the front end part of the steel wire rope close to the side of the air knife nozzle is welded with a threaded sleeve (not shown in the figure), a stainless steel metal strip (not shown in the figure) with the diameter of 3mm is screwed into the threaded sleeve, and the stainless steel metal strip is adopted.
The shielding device of the air nozzle adopts a steel wire rope flexible body penetrating in a steel wire spring as a driving main body, and aims to realize small occupied volume of the device, installation can be carried out by utilizing a three-dimensional space position, over a zinc pot, fixation of an over-sized facility is not allowed, particularly, the size of an air knife beam body is small, the transmission side and the working side of the air knife beam are not fixed in position and are too close to the zinc pot downwards, and high-temperature radiation is large, so that the steel wire rope flexible body is adopted.
The metal strip is cylindrical (not shown in the figure) and 500mm in length, and aims to achieve the purposes that the length of the air knife is 1600mm, the minimum width of the strip steel specification is 800mm, and the air knife lips on two sides of the strip steel are 400mm, so that the maximum distance of the metal strip entering the cavity of the air knife is 400mm along with the movement of the steel wire rope, the metal strip does not completely enter the cavity of the air knife, and the friction caused by the steel wire rope entering the inner side of the knife lip of the cavity or the foreign matters brought into the cavity are reduced.
The head of the metal strip is conical, the gap between the conical tip and the upper surface of the lower knife lip of the inner cavity of the knife lip is 1mm, when the head of the metal strip connected with the steel wire rope is adjusted and positioned at the zero position of the shielding device, the head of the metal strip is positioned at the position which penetrates out of the side vertical surface of the cavity of the air knife by 2mm, and the purpose is that the head of the metal strip of the shielding device penetrates out of the side vertical surface of the cavity of the air knife by 2mm because the head of the metal strip of the shielding device with the thickness of 0.5mm stays at the leftmost end or the rightmost end of the cavity of the air knife and is better inserted into the inner cavity of the air knife when the head of the metal strip is stopped, the head of the metal strip just falls on the upper part of the cleaning device, the conical tip of the metal strip and the upper surface of the lower knife lip have a gap, so that the metal strip can effectively avoid the thickness of a thin steel sheet cleaned by the knife lip cleaning device arranged between the upper knife lip and the lower knife lip of the air knife when moving along with the steel wire rope, the metal strip is ensured to pass in and out between the upper knife lip and the lower knife lip without being blocked.
The lower knife lip of the inner cavity of the air knife is horizontally arranged, the inner side of the lip of the upper knife lip is arc-shaped, and when the gap between the upper knife lip and the lower knife lip is adjusted, the gap between the edges of the upper knife lip and the lower knife lip, namely the opening degree of the knife lip, is 1.4mm at most and 1.1mm at least; a stainless steel metal strip with the diameter of 3mm clings to a space formed by the inner sides of the upper and lower knife lips to move back and forth under the pressure of air jet;
the steel wire spring is sleeved on a steel wire rope (not shown in the figure), the end parts of the steel wire spring and the steel wire rope are aligned, the steel wire spring 5 and the steel wire rope penetrate into an upper end protective sleeve 11 of the gear box and are aligned with the end part of the sleeve, the sleeve is fixed on the cutter beam by the clamp 111, the steel wire spring and the steel wire rope are at the original position of the shielding device at the moment, when the shielding device is withdrawn for use, the PLC controls the motor to operate, the gear 3 on the motor shaft 2 in the gear box drives the three gears 7 to operate simultaneously, the middle disc 4 is driven to rotate by the rotation of the three gears 7, the spring groove in the middle disc groove drives the steel wire spring 5 to move, and when the steel wire spring 5 is wrapped on the steel wire rope (not shown in the figure), the steel wire rope and the steel wire spring synchronously move, namely, when the PLC calculates the distance to the stop position, the motor stops running;
when the shielding device is put into use, the PLC controls the motor to operate in the forward direction, the gear 3 on the motor shaft 2 in the gear box drives the three gears 7 to operate simultaneously, the spring groove in the groove of the middle disc 4 drives the steel wire spring to move, the three gears 7 are adopted to drive the middle disc 4 to rotate, the middle disc 4 drives the steel wire spring 5 and the steel wire rope to move, the three gears 7 rotate simultaneously, the stress uniformity and the rotation stability can be ensured when the middle disc 4 rotates, the middle disc drives the steel wire rope wrapped by the steel wire spring to operate more stably, the steel wire rope wrapped by the steel wire spring cannot have the phenomenon of speed inconsistency, the spring and the steel wire rope can keep the synchronous consistency, the spring and the steel wire rope cannot be dislocated, one long and one short inconsistency occur when the stopping position is set;
when the spring groove in the groove of the middle disc 4 drives the steel wire spring 5 to move, the steel wire rope and the metal strip at the end part move in the air knife nozzle cavity in the protective sleeve 12 at the lower end of the gear box 1, when the PLC detects that the end part of the metal strip is away from the strip steel width and is 50mm away from the strip steel, the motor stops running, the metal strip stays at the position, strong air flow presses the metal strip between the inner sides of the upper and lower knife lips, the purpose of shielding nitrogen gas injection is achieved, the strip steel width and the position of 50mm are added, the purpose of keeping the distance of 50mm between the shielding device and the strip steel is achieved, the air flow at the edge part of the strip steel can be guaranteed to be stable, the defect of the strip steel plate is reduced, the coating quality is affected, the strip steel width is the specification size issued by the upper computer, and 50mm is the distance which can be set by the PLC and can be adjusted according to needs.
An airflow nozzle shielding device is arranged on two sides of an air knife beam, when in production and operation, strip steel passes through the middle of an air knife, two sides of the air knife beam on the upper surface of the strip steel and two sides of the air knife beam on the lower surface of the strip steel are respectively provided with an airflow shielding device, and a PLC controls shielding distance according to the width of the strip steel and is synchronously used.
The shielding device for the air flow nozzle is simple in structure and convenient to operate, reduces consumption of nitrogen, and can ensure that the quality of the edge of the strip steel is not influenced.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (9)
1. The air flow nozzle shielding device is characterized in that the air flow shielding device is distributed on two sides of an air knife beam (16), the device comprises two micro motors and a gear box, wherein the two micro motors are respectively connected with the gear box to be used as driving, the gear box is divided into a box seat (1) and a box cover (13), box seat screws are fixed on the side wall of the knife beam (16), and the micro motors are installed inside the knife beam.
2. The airflow nozzle shielding device according to claim 1, wherein the micro motor comprises a motor shaft (2), a gear (3), a middle disc (4), a wire spring (5), a column (6) and a gear (7), the motor shaft (2) extends out of the cutter beam wall and penetrates through a central hole of a gear box base; a first gear (3) is connected to the motor shaft (2), the first gear penetrates through a central hole of the middle disc (4), a gap is reserved between the first gear and the central hole of the middle disc, the middle disc (4) falls in the gear box base (1), an arc-shaped groove is formed in the vertical surface of the side of the round edge of the middle disc, a spiral groove is formed in the groove, the spiral direction of the spiral groove is the same as the spiral direction of the spiral steel wire spring (5), and the steel wire spring falls on the spiral groove in the arc-shaped groove; three upright columns (6) are fixed on the circumference of the middle disc (4), the three upright columns are arranged in an equilateral triangle shape, two spur gears (7) are respectively sleeved on the upright columns, and a first gear (3) connected to the motor shaft (2) is higher than the middle disc (4) and is meshed with the three gears (7) arranged on the middle disc upright columns (6).
3. A gas flow nozzle shielding device according to claim 2, wherein the inner depth of the gearbox cover (13) is 15mm, and the inner circumference is provided with 63 teeth, so that the gearbox cover is ensured to be covered on the box base, and three gear wheels (7) on the middle disk in the box base are fully meshed with the inner teeth (14) in the box cover.
4. The airflow nozzle shielding device according to claim 3, wherein a steel wire spring (5) is installed in the arc-shaped groove of the side vertical surface of the round edge of the middle disc, and the spring falls on a spiral groove in the arc-shaped groove; the steel wire spring (5) is wound along the arc-shaped groove of the middle disk in the gear box and then enters and exits in the upper and lower circumferential tangential directions of the middle disk; a guide protecting sleeve (8) is respectively arranged in the gear box in the upper and lower circumferential tangential directions of the middle disc (4), and the steel wire spring penetrates out of the gear box along the guide protecting sleeve and enters into a protecting sleeve outside the gear box; the protective sleeve (11) at the upper end of the gear box in the horizontal direction is 1100mm, and the end part of the sleeve is provided with a clamp (111) fixed on the knife beam; the protective sleeve (12) at the lower end of the gear box in the horizontal direction is 1800mm in length, and the end part of the sleeve is provided with a quick connector (121) which is connected and fixed on the side surface of the air knife nozzle cavity.
5. The air nozzle shielding device according to claim 4, wherein a steel wire rope with a diameter of 4mm penetrates through the steel wire spring, the length of the steel wire spring (5) is 1500mm, the length of the steel wire rope is 2700mm, a threaded sleeve is welded at the front end part of the steel wire rope close to the side of the air knife nozzle, and a stainless steel metal strip with a diameter of 3mm is screwed into the threaded sleeve.
6. The airflow nozzle shielding device according to claim 5, wherein a flexible body of a steel wire rope is inserted into the steel wire spring to serve as the driving body.
7. The airflow nozzle shielding device according to claim 6, wherein the metal strip is cylindrical, the length of the metal strip is 500mm, the head of the metal strip is conical, the gap between the tip of the cone and the upper surface of the lower knife lip of the inner cavity of the knife lip is 1mm, and when the metal strip head connected with the steel wire rope is adjusted and positioned in the zero position of the shielding device, the head of the metal strip is positioned at a position which penetrates out of the side vertical surface of the cavity of the air knife by a distance of 2 mm.
8. The airflow nozzle shielding device according to claim 7, wherein the lower knife lip of the inner cavity of the air knife is horizontally arranged, the inner side of the lip of the upper knife lip is arc-shaped, and when the gap between the upper knife lip and the lower knife lip is adjusted, the gap between the edges of the upper knife lip and the lower knife lip, namely the opening degree of the knife lip, is 1.4mm at most and 1.1mm at least; the stainless steel metal strip with the diameter of 3mm is tightly attached to the space formed by the inner sides of the upper and lower knife lips under the pressure of air jet to move back and forth.
9. The airflow nozzle shielding device according to claim 7, wherein the wire spring is sleeved on the wire rope, the wire spring and the wire rope are aligned, the wire spring (5) and the wire rope penetrate into a protective sleeve (11) at the upper end of the gear box and are aligned with the end of the sleeve, the sleeve is fixed on the knife beam by a clamping ring (111), the position of the wire spring and the wire rope at this time is the original position of the shielding device, when the shielding device is removed from use, the PLC controls the motor to run, a first gear (3) on a motor shaft (2) in the gear box drives three second gears (7) to run simultaneously, as internal teeth (14) on the gear box cover (13) are fixed, the rotation of the three second gears (7) drives the middle disk (4) to rotate, a spring groove in the middle disk groove drives the wire spring (5) to move, and the wire spring (5) is wrapped on the wire rope, the steel wire rope and the steel wire spring also move synchronously, and when the steel wire rope and the steel wire spring move to the fixed clamping port on the air knife beam, namely the PLC calculates the distance to the stop position, the motor stops running.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011273483.4A CN114480995B (en) | 2020-11-13 | 2020-11-13 | Air current nozzle shelters from device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011273483.4A CN114480995B (en) | 2020-11-13 | 2020-11-13 | Air current nozzle shelters from device |
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| CN114480995A true CN114480995A (en) | 2022-05-13 |
| CN114480995B CN114480995B (en) | 2023-12-05 |
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| GB1422228A (en) * | 1972-11-27 | 1976-01-21 | Italsider Spa | Device for adjusting the thickness of a zinc coating on a metal sheet |
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|---|---|
| CN114480995B (en) | 2023-12-05 |
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