WO2024019237A1

WO2024019237A1 - Air knife system having angle-adjusting device

Info

Publication number: WO2024019237A1
Application number: PCT/KR2022/019295
Authority: WO
Inventors: 허기복; 김윤자; 강법성; 백경철; 허숭
Original assignee: 주식회사 삼우에코
Priority date: 2022-07-21
Filing date: 2022-11-30
Publication date: 2024-01-25
Also published as: CN117431489A; EP4309803A1; KR102444541B1

Abstract

The present invention provides an air knife system having an angle-adjusting device. The present invention is such that, when a screw shaft (112) rotates, a moving body (113) moves vertically, and an angle-adjusting lever (118) rotates about a pipe center (15c) by receiving the moving force of the moving body by means of a shaft member (115), a rotating body (116) and a movable rail (117). In this process, the rotating body moves together with the moving body to rotate about the shaft member, and the movable rail rotates together with the rotating body to be away from, or closer to, the pipe center. Thus, the angle-adjusting lever rotates a first air supply pipe (15A) to change the vertical angle of an air knife (10) relative to a plated steel sheet.

Description

Air knife system with angle adjustment device

Embodiments of the present invention relate to an air knife system including an air knife and a device for adjusting its vertical angle.

In general, the air knife can spray high-pressure gas to control the plating amount (plating thickness) of the galvanized steel sheet, and the angle can be adjusted in the vertical direction depending on operating conditions and processes.

The prior art has a structural problem in that the installation location of the air knife is narrow and interference with surrounding equipment occurs, making it impossible to smoothly adjust the angle of the air knife. Additionally, the vertical angle of the air knife cannot be accurately measured during the operation process, which may reduce production efficiency.

Related patent documents include KR 20-1992-0012105 U (1992.07.25), JP 2001-131724 A (2001.05.15), KR 20-0382147 Y1 (2005.04.18), KR 10-2013-0044970 A (2013.05.03) ) and KR 10-1866313 B1 (2018.06.14) may be referenced.

Embodiments of the present invention seek to smoothly adjust the vertical angle of the air knife. In addition, we want to accurately measure the angle of the adjusted air knife.

The problem to be solved is not limited to this, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, an air knife for spraying gas onto a plated steel sheet; a first air supply pipe and a second air supply pipe protruding along the left and right directions from corresponding positions on both sides of the air knife; a main body installed above the air knife and including a first bracket and a second bracket for rotatably supporting the first air supply pipe and the second air supply pipe, respectively, about the center of the pipe; By rotating the first air supply pipe, the air knife rotates with respect to the center of the pipe to adjust the vertical angle of the air knife with respect to the plated steel plate. The angle adjustment device includes: 1 A fixing body provided on a bracket and located in front or behind the first air supply pipe; a screw shaft rotatably provided on the fixed body about a vertical axis and rotated by a shaft drive unit; a movable body that is screw-coupled with the screw shaft and can move up and down according to the rotation direction of the screw shaft; and an angle manipulation lever having a first end coupled to the first air supply pipe and a second end connected to the movable body through a power transmission unit, wherein the power transmission unit provides a moving force of the movable body. An air knife system may be provided that transmits to the angle control lever and rotates the angle control lever.

The power transmission unit includes a shaft member provided to the moving body to be rotatable about a left and right axis; a rotating body provided on the shaft member and rotating together with the shaft member; It may be provided on the rotating body to be movable along a radial direction of the center of the pipe, and may include a slider coupled to the second end of the angle adjustment lever.

The air knife system may further include a first angle measuring device. The first angle measuring device is provided on the angle adjustment lever and has a gear tooth of a pinion provided along an outer circumference based on the center of the pipe, and the gear tooth is disposed at the front or rear of the first air supply pipe. 1 gear member; a second gear member extending in the vertical direction, the upper part of which is located on the side of the main body, and the gear teeth of the rack that engage with the gear teeth of the first gear member are provided at the lower part; a guide module connected to the fixed body and supporting the second gear member to be movable in an upward and downward direction; a scale body provided on the main body to be located near the upper part of the second gear member and having a scale for indicating a rotation angle of the air knife; It is provided at the upper part of the second gear member and may include a scale indicator that moves in an upward and downward direction according to rotation of the angle adjustment lever and indicates the scale.

The guidance module includes an auxiliary body connected to the fixed body; a support member supporting the second gear member to be movable up and down; It may include at least one elastic member between the auxiliary body and the support member that provides elastic force to the support member toward the first gear member.

The air knife system according to an embodiment of the present invention may further include a second angle measuring device. The second angle measuring device includes a measuring jig provided to the second air supply pipe and having first gear teeth along an outer circumference based on the center of the pipe; A second gear gear engaged with the first gear tooth includes a rotation element provided on the outer periphery, and a measurement module that detects a rotation amount of the rotation element; a module holder that holds the measurement module and is rotatable about a hinge axis parallel to the center of the tube to space the rotation element away from or approach the measurement jig according to the direction of rotation; a mounting block provided on the second bracket, holding the hinge axis, and positioned so that the module holder is positioned between the measurement jig; It may include at least one elastic member between the module holder and the mounting block that provides elastic force to the module holder toward the measurement jig.

The means of solving the problem will become more specific and clear through the examples and drawings described below. In addition, various solution methods other than those mentioned below may be additionally presented.

According to an embodiment of the present invention, the angle of the air knife can be smoothly adjusted in the vertical direction. Additionally, the rotation angle of the air knife can be accurately measured.

The effect of the invention is not limited to this, and other effects not mentioned can be clearly understood by those skilled in the art from this specification and the attached drawings.

1 is a front view showing an air knife system according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1.

Figure 3 is a cross-sectional view taken along line B-B of Figure 2.

4 and 5 are conceptual diagrams showing the operation of the angle adjustment device in the air knife system according to an embodiment of the present invention.

Figure 6 is a cross-sectional view taken along line C-C of Figure 1.

Figure 7 is a cross-sectional view taken along line D-D in Figure 1.

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

An air knife system according to an embodiment of the present invention is shown in FIGS. 1 to 7. The air knife system according to an embodiment of the present invention may include an angle adjustment device 110, a first angle measurement device 120, and a second angle measurement device 130. Figure 1 shows the overall configuration of an air knife system according to an embodiment of the present invention. Figures 2 and 3 mainly show the configuration of the angle adjustment device 110. Figures 4 and 5 conceptually show the operation of the angle adjustment device 110 based on Figure 2. FIG. 6 mainly shows the first angle measuring device 120, and FIG. 7 mainly shows the second angle measuring device 130.

Referring to FIG. 1, the air knife system according to an embodiment of the present invention includes an air knife 10 that sprays gas (eg, air) onto a plated steel sheet (not shown); a first air supply pipe (15A) extending along the left and right directions from corresponding positions on both sides of the air knife (10) and protruding to the left, and a second air supply pipe (15B) protruding to the right; A first bracket (21A) installed above the air knife (10) and rotatably supporting the first air supply pipe (15A) and the second air supply pipe (15B), respectively, about the pipe center (15c). and a main body 20 having a second bracket 21B; By rotating the first air supply pipe 15A, the air knife 10 is rotated based on the pipe center 15c, thereby increasing the vertical angle (i.e., gas injection angle) of the air knife 10 with respect to the plated steel plate. ) may include the angle adjustment device 110 that adjusts the angle.

In a hot dip plating process, the air knife 10 may be positioned at the rear end of a plating bath (not shown). A steel sheet (not shown) may be immersed in molten metal (eg, zinc (Zn), etc.) in the plating bath to form the plated steel sheet with the molten metal attached to the surface. The air knife 10 sprays the gas at high pressure on the plated steel sheet that has passed through the plating bath to adjust the amount (plating amount) of the molten metal attached to the plated steel sheet.

The first air supply pipe 15A and the second air supply pipe 15B may be straight, and may be coupled to both sides of the air knife 10, respectively, and rotate together with the air knife 10. The center of the first air supply pipe 15A and the center of the second air supply pipe 15B coincide with each other when viewed from the side, thereby providing the pipe center 15c.

The main body 20 may be configured to have a flow path for transporting the gas, and the flow path may be connected to a high-pressure gas supply source (not shown) that provides the gas. The main body 20 may include a frame with a duct structure that provides the flow path. The position of the frame of the duct structure may be fixed by a mounting frame (not shown).

In Figure 1, reference numeral 30 is a gas transfer pipe. The gas transfer pipe 30 connects the first air supply pipe 15A and the second air supply pipe 15B with the flow path, respectively, so as to introduce the gas supplied into the flow path from the high-pressure gas park, respectively. It can flow out to the first air supply pipe (15A) and the second air supply pipe (15B). The gas may be introduced into the air knife 10 through the first air supply pipe 15A and the second air supply pipe 15B, and may be injected into the plated steel sheet through the air knife 10.

The gas transfer pipe 30 is a pipe connected to the end of the first air supply pipe 15A and the end of the second air supply pipe 15B, respectively, and may include an elbow. The end of the first air supply pipe (15A) and the end of the second air supply pipe (15B) may be fitted with the elbow so as to be rotatable about the center of the pipe (15c).

2 to 5, the angle adjustment device 110 is a left first side of both sides of the first bracket 21A (or a right second side facing the air knife 10). ) and a fixed body 111 located in front (or rear) of the first air supply pipe 15A; a screw shaft (112) rotatably provided on the fixing body (111) about a vertical axis (A1) and having a male screw (112t) formed on its outer circumference; It is provided with a female thread (113t) corresponding to the male thread (112t) of the screw shaft (112) and is screw-coupled with the screw shaft (112), and is capable of moving up and down according to the rotation direction of the screw shaft (112). A moving body 113; a shaft drive unit 114 that rotates the screw shaft 112 forward and backward; a shaft member 115 provided on the left side of the moving body 113 to be rotatable about a left-right axis A2; a rotating body 116 provided on the shaft member 115 and rotated together with the shaft member 115; A straight movable rail (slider, 117) provided on the rotating body 116 to be movable along a radial direction of the tube center 15c; It may include an angle control lever 118 in which first ends 118a and second ends 118b on both sides are coupled to the first air supply pipe 15A and the movable rail 117, respectively.

Referring to FIG. 3, the fixing body 111 may be formed so that its size in the vertical direction is similar to the length of the screw axis 112. The fixed body 111 may be provided with a rotation support element 111b, such as a bearing, at the upper portion of the screw shaft 112 to rotatably support the upper head of the screw shaft 112.

The screw shaft 112 may have a lower body having the male thread 112t, and the moving body 113 may have a screw hole penetrating in the vertical direction and having the female thread 113t formed therein. The movable body 113 may be formed in a shape in which rotation with the screw axis 112 is limited by contact with the fixed body 111, etc.

Referring to FIGS. 1 and 2, the shaft drive unit 114 includes a drive motor 114a that provides rotational force; a reducer (114b) that reduces the rotational speed of the driving motor (114a) and outputs the output; It may include a power transmission shaft (114c) that transmits the rotational force output from the reducer (114b) to the screw shaft (112).

For example, the drive motor 114a may be mounted on the frame of the duct structure of the main body 20. The reducer 114b may include an input shaft connected to the drive motor 114a and an output shaft connected to the transmission shaft 114c, and reduces the rotational speed of the drive motor 114a. For this purpose, a plurality of gears may be provided between the input shaft and the output shaft. Depending on the positional relationship between the reducer 114b and the screw shaft 112, the transmission shaft 114c may include a universal joint, etc.

In the shaft drive unit 114, the drive motor 114a and the reducer 114b may be controlled by a clutch, etc., and the input shaft of the reducer 114b may be connected with a handle for manual operation ( handle) may be connected. Accordingly, when necessary, power transmission between the drive motor 114a and the reducer 114b may be blocked and then the screw shaft 112 may be rotated using the handle.

Referring to FIG. 3 and the like, the shaft member 115, the rotating body 116, and the movable rail 117 constitute a power transmission unit. That is, the shaft member 115, the rotating body 116, and the movable rail 117 operate the movable body 113 between the movable body 113 and the angle manipulation lever 118 to manipulate the angle. It is connected to the second end 118b of the lever 118, and transmits the vertical moving force of the moving body 113 to the angle manipulation lever 118 to rotate the angle manipulation lever 118. there is. Referring to FIGS. 1 and 4 , the angle control lever 118 is connected to the second surface on the right (or the second surface on the left) of the first surface on the left and the second surface on the right of the second end 118b. first surface) may be connected to the movable rail 117.

The movable rail 117 may have a base portion and a rail portion on the base portion. The base portion of the movable rail 117 may be coupled to the second end 118b of the angle manipulation lever 118, and the rail portion of the movable rail 117 may be connected to the rotating body 116. It can be combined to enable sliding movement. The rotating body 116 may have a sliding groove (116g, see FIG. 5) in which the rail portion of the movable rail 117 is slidably coupled. Referring to FIGS. 4 and 5 , the sliding groove 116g of the rotating body 116 may be formed to be perpendicular to the left and right axis A2.

As shown in FIGS. 4 and 5, the angle control lever 118 is fixed with the first end 118a inserted into the outer periphery of the first air supply pipe 15A. ) can be rotated together. The angle control lever 118 may penetrate the first end 118a in the left and right directions and may be formed with an insertion hole 118h (see FIG. 6) into which the first air supply pipe 15A is inserted.

Referring to FIG. 4 and the like, the angle control lever 118 is positioned at the center of the insertion hole 118h (see the pipe center 15c) for easy coupling with the first air supply pipe 15A. As a reference, a first unit 118-1 including a portion of the first end 118a and a second unit 118-2 including the remainder of the first end 118a and the second end 118b. ), and the first unit 118-1 and the second unit 118-2 can be assembled together by bolts 118-3 (see FIG. 6) to provide the insertion hole 118h. there is. The first unit 118-1 and the second unit 118-2 press the first air supply pipe 15A inserted into the insertion hole 118h by tightening the bolt 118-3. You can. As shown in FIG. 6, the angle control lever 118 has at least one fixing protrusion 118p protruding from the inner periphery of the insertion hole 118h to increase the coupling force with the first air supply pipe 15A. ) can have.

When the screw shaft 112 is rotated about the vertical axis A1 by the shaft drive unit 114, the moving body 113 moves upward or downward along the vertical axis A1. It can be moved, and the angle manipulation lever 118 receives the moving force of the moving body 113 through the shaft member 115, the rotating body 116, and the movable rail 117 to It can be rotated upward or downward based on the center 15c. In this process, in the power transmission unit interposed between the moving body 113 capable of linear movement and the angle manipulation lever 118 capable of rotary movement, the shaft member 115 and the rotating body 116 are moved to the left and right sides. By rotating about the axis of direction A2, the movable rail 117 is moved along the radial direction of the tube center 15c to connect the second end 118b to the rotating body 116. By changing the position, rotation according to the rotation radius of the angle control lever 118 can be allowed.

Specifically, when the moving body 113 moves upward or downward, the shaft member 115 and the rotating body 116 move together with the moving body 113 and move along the left and right axis A2. It can be rotated upward or downward about the center, and the movable rail 117 moves with the moving body 113 and rotates with the rotating body 116 (i.e., the movable rail 117 is positioned in an up and down position). Depending on the variation, the longitudinal direction is rotated to coincide with the radial direction of the tube center 15c) and can be moved along the radial direction of the tube center 15c to be spaced apart from or closer to the tube center 15c ( 4 and 5). At this time, the angle control lever 118 is rotated upward or downward based on the pipe center 15c, thereby rotating the first air supply pipe 15A upward or downward based on the pipe center 15c. The air knife 10 can be rotated upward or downward based on the pipe center 15c. Accordingly, the air knife system according to an embodiment of the present invention can change the vertical angle of the air knife 10 with respect to the plated steel sheet to the required angle.

4 shows that the moving body 113 is moved downward, the shaft member 115 and the rotating body 116 are rotated downward, and the movable rail 117 approaches the pipe center 15c. By moving in the direction, the first air supply pipe 15A is rotated downward with respect to the pipe center 15c, and the angle of the air knife 10 with respect to the plated steel plate is adjusted downward. On the contrary, in Figure 5, the moving body 113 is moved upward, the shaft member 115 and the rotating body 116 are rotated upward, and the movable rail 117 is centered at the pipe center 15c. By moving in a direction away from the first air supply pipe (15A), the first air supply pipe (15A) is rotated upward with respect to the pipe center (15c), and the angle of the air knife (10) with respect to the plated steel plate is adjusted upward. represents.

The first angle measuring device 120 may display the rotation angle of the air knife 10 adjusted by the angle adjusting device 110 so that a worker, etc. can visually check it.

Referring to Figures 1 and 6, the first angle measuring device 120 is provided on the angle adjustment lever 118 and is provided along the outer circumference of the pipe center 15c as a reference. a first gear member 122 having gear teeth, the gear teeth being disposed in front or behind the first air supply pipe 15A; A second gear member 123 extends in the vertical direction so that its upper part is positioned close to the main body 20, and gear teeth of a rack that engage with the gear teeth of the first gear member 122 are provided at the lower part. )and; A guide module (see

reference numerals

121, 126, and 127) connected to the fixed body 111 and supporting the second gear member 123 to be movable in the vertical direction; A scale body 125 provided on the main body 20, disposed close to the upper part of the second gear member 123, and having a scale for indicating the rotation angle of the air knife 10; ; A scale is provided at the upper part of the second gear member 123 and moves in the up and down direction as the angle adjustment lever 118 rotates to indicate the scale corresponding to the rotation angle of the air knife 10. It may include an indicator 124.

According to the first angle measuring device 120, when the angle adjustment device 110 is operated to rotate the angle control lever 118 to adjust the angle of the air knife 10, the first gear The member 122 is rotated with the angle control lever 118 with respect to the pipe center 15c, the second gear member 123 is moved upward or downward, and the scale indicator 124 is Since it moves together with the second gear member 123 and indicates the scale corresponding to the rotation angle of the air knife 10, an operator, etc. can use the scale indicated by the scale indicator 124 to use the air knife ( 10) You can check the rotation angle.

The first gear member 122 may be disposed on the first surface on the left (or the second surface on the right) of the angle manipulation lever 118 and rotated together with the angle manipulation lever 118. .

The guide module may be located opposite the fixed body 111 with respect to the angle manipulation lever 118. Accordingly, the angle manipulation lever 118 may be located between the fixed body 111 and the guide module.

Referring to FIG. 6, the guidance module includes an auxiliary body 121 connected to the fixed body 111 and having a fixed position; a support member 126 having a guide hole for supporting the second gear member 123 to be movable up and down; Between the auxiliary body 121 and the support member 126, an elastic force is applied to the support member 126 toward the first gear member 122 to form the gear teeth of the first gear member 122 and the second gear member 122. 2 It may include at least one elastic member 127 that brings the gear teeth of the gear member 122 into close contact.

The elastic member 127 may be a spring or the like. The elastic member 127 elastically pushes the second gear member 122 toward the first gear member 122 through the support member 126, thereby moving the gear of the first gear member 122. Backlash that may occur between the teeth and the gear teeth of the second gear member 122 can be prevented. According to this, the rotation angle measurement of the air knife 10 using the first gear member 122 and the second gear member 122 can be more accurately measured.

Meanwhile, as shown in FIG. 6, an insertion groove 123a may be formed in the second gear member 123 in the vertical direction, and the insertion groove 123a may slide along the insertion groove 123a. An insertion protrusion 126a that can be inserted may be formed in the guide hole of the support member 126. The insertion groove 123a and the insertion protrusion 126a can guide the second gear member 123 to move more stably in the vertical direction without shaking.

The second angle measuring device 130 can measure the rotation angle of the air knife 10 adjusted by the angle adjusting device 110 and provide the measurement to the driver's cab.

Referring to FIG. 7, the second angle measuring device 130 is provided in the second air supply pipe 15B, and has a first gear tooth 131a along the outer circumference based on the pipe center 15c. A measuring jig 131 provided; The second gear tooth 132b engaged with the first gear tooth 131a has a rotation element provided on the outer periphery, and detects the rotation amount of the rotation element to measure the rotation angle of the air knife 10, a measurement module 132 that transmits the detected value to the cab wirelessly or wired; Holds the measurement module 132 and is rotatable about a hinge axis 136 parallel to the tube center 15c to space the rotation element from the measurement jig 131 according to the rotation direction. A module holder 135 for accessing or accessing; a mounting block 137 provided on the second bracket 21B, holding the hinge axis 136, and positioned so that the module holder 135 is positioned between the measuring jig 131; Between the module holder 135 and the mounting block 137, an elastic force is applied to the module holder 135 toward the measuring jig 131 to form the first gear teeth 131a and the second gear teeth 132b. It may include at least one elastic member 138 that comes into close contact with the.

The measurement jig 131 may be placed on the right (or left) side of the second bracket 21B, and accordingly, the mounting block 137 is located on the right side of both sides of the second bracket 21B. It may be coupled to the second side (or the first side on the left side facing the air knife 10).

The measurement module 132 may be equipped with an encoder, etc. to detect the rotation amount of the rotating element. The rotation element of the measurement module 132 may be a spur gear, and accordingly, the first gear tooth 131a may be a gear tooth of a spur gear. The rotation element may have a smaller rotation radius than the measurement jig 131.

Meanwhile, the measurement jig 131 may be fixed while being inserted into the outer circumference of the second air supply pipe 15B and rotate together with the second air supply pipe 15B. For easy coupling with the second air supply pipe 15B, the measuring jig 131 is divided into two parts based on the center of the pipe 15c, assembled together with bolts, and connected to the second air supply pipe 15B. It can be compressed by tightening the bolt.

The elastic member 138 of the second angle measuring device 130 may be a spring or the like. The elastic member 138 elastically pushes the rotation element (spur gear) of the measurement module 132 toward the first gear tooth 131a of the measurement jig 131 through the module holder 135. By doing so, it is possible to prevent backlash that may occur between the first gear tooth (131a) and the second gear tooth (132b). According to this, the rotation angle of the air knife 10 is measured using the measurement jig 131 having the first gear teeth 131a and the measurement module 132 having the second gear teeth 132b. It can be implemented accurately.

In FIG. 7,

reference numerals

133, 134A, and 134B denote sensing modules for detecting the upper and lower limit rotation angles of the air knife 10. The sensing module can be used to prevent the air knife 10 from being rotated beyond an allowable range by the angle adjustment device 110.

Reference numeral 133 denotes a reference member provided to the measuring jig 131, and

reference numerals

134A and 134B indicate that the reference member 133 rotated together with the measuring jig 131 has the upper limit rotation angle of the air knife 10. The first sensor and the second sensor detect whether each sensor is positioned at a position corresponding to the lower limit rotation angle.

The first sensor 134A and the second sensor 134B may be contact sensors such as limit switches. Alternatively, the first sensor 134A and the second sensor 134B may be non-contact sensors such as optical sensors. When using an optical sensor, for example, the reference member 133 may be configured to reflect light from each of the first sensor 134A and the second sensor 134B.

Although the present invention has been described above, the present invention is not limited to the disclosed embodiments and the accompanying drawings, and various modifications may be made by those skilled in the art without departing from the technical spirit of the present invention.

Claims

an air knife (10) for spraying gas onto the plated steel sheet; a first air supply pipe (15A) and a second air supply pipe (15B) protruding along the left and right directions from corresponding positions on both sides of the air knife (10); A first bracket (21A) installed above the air knife (10) and rotatably supporting the first air supply pipe (15A) and the second air supply pipe (15B), respectively, about the pipe center (15c). and a main body 20 having a second bracket 21B; By rotating the first air supply pipe (15A), the air knife (10) is rotated about the pipe center (15c) to adjust the vertical angle of the air knife (10) with respect to the plated steel plate. Contains (110),

The angle adjustment device 110,

a fixing body 111 provided on the first bracket 21A and located in front or behind the first air supply pipe 15A;

a screw shaft 112 provided to the fixed body 111 to be rotatable about a vertical axis A1 and rotated by a shaft drive unit 114;

a moving body 113 that is screw-coupled with the screw shaft 112 and can move up and down according to the rotation direction of the screw shaft 112;

An angle manipulation lever 118 having a first end 118a coupled to the first air supply pipe 15A and a second end 118b connected to the moving body 113 through a power transmission unit. Includes,

The power transmission unit transmits the moving force of the moving body 113 to the angle manipulation lever 118 to rotate the angle manipulation lever 118,

Air knife system.
In claim 1,

The power transmission unit is,

an axis member 115 provided to the moving body 113 to be rotatable about a left-right axis A2;

a rotating body 116 provided on the shaft member 115 and rotated together with the shaft member 115;

A slider 117 is provided on the rotating body 116 to be movable along the radial direction of the tube center 15c and coupled to the second end 118b of the angle adjustment lever 118.

Air knife system.
In claim 1 or claim 2,

The shaft drive unit 114 is,

a drive motor 114a;

a reducer (114b) that reduces the rotational speed of the driving motor (114a);

Comprising a transmission shaft (114c) that transmits the rotational force output from the reducer (114b) to the screw shaft (112),

Air knife system.
In claim 1 or claim 2,

The air knife system further includes a first angle measuring device 120,

The first angle measuring device 120,

It is provided on the angle adjustment lever 118 and has gear teeth of a pinion provided along the outer circumference based on the pipe center 15c, and the gear teeth are disposed in the front or rear of the first air supply pipe 15A. a first gear member 122;

a second gear member 123 extending in the vertical direction, the upper part of which is located on the side of the main body 20, and the gear teeth of the rack engaging with the gear teeth of the first gear member 122 are provided at the lower part;

a guide module connected to the fixed body 111 and supporting the second gear member 123 to be movable in an upward and downward direction;

a scale body 125 provided on the main body 20 to be located near the upper part of the second gear member 123 and having a scale for indicating the rotation angle of the air knife 10;

Characterized in that it is provided at the upper part of the second gear member 123 and includes a scale indicator 124 that moves in the vertical direction according to the rotation of the angle adjustment lever 118 and indicates the scale.

Air knife system.
In claim 4,

The guidance module is,

an auxiliary body 121 connected to the fixed body 111;

a support member 126 supporting the second gear member 123 so as to be movable up and down;

Characterized in that it includes at least one elastic member 127 between the auxiliary body 121 and the support member 126, which provides elastic force to the support member 126 toward the first gear member 122. ,

Air knife system.
In claim 1 or claim 2,

The air knife system further includes a second angle measuring device 130,

The second angle measuring device 130,

A measuring jig (131) provided to the second air supply pipe (15B) and provided with first gear teeth (131a) along the outer circumference based on the pipe center (15c);

A second gear tooth (132b) engaged with the first gear tooth (131a) has a rotation element provided on the outer periphery, and a measurement module 132 that detects the rotation amount of the rotation element;

It holds the measurement module 132 and is rotatable about a hinge axis 136 parallel to the tube center 15c to space the rotation element from the measurement jig 131 according to the rotation direction. A module holder 135 for accessing or accessing;

a mounting block 137 provided on the second bracket 21B, holding the hinge axis 136, and positioned so that the module holder 135 is positioned between the measuring jig 131;

Characterized in that it includes at least one elastic member 138 between the module holder 135 and the mounting block 137 that provides elastic force to the module holder 135 toward the measurement jig 131.

Air knife system.