Air knife system with angle adjustment device

Abstract

The present invention provides an air knife system with an angle adjustment device. In the present invention, if the screw shaft (112) is rotated, the moving body (113) moves in the up-down direction, and the angle adjustment lever (118) rotates with the pipe center (15c) as a reference by receiving the moving force of the moving body through the shaft member (115), the rotating body (116), and the slide rail (117). In this process, the rotating body rotates with the shaft member as the center while moving together with the moving body, and the slide rail rotates together with the rotating body while being spaced apart from or approaching the pipe center. Therefore, the angle adjustment lever rotates the first air inlet pipe (15A) to change the up-down angle of the air knife (10) with respect to the plated steel sheet.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to an air knife and an air knife system including a device for adjusting the up-and-down angle of the air knife. BACKGROUND

[0002] Generally, the air knife can spray high-pressure gas in order to control the plating amount (plating thickness) of a galvanized steel sheet, and can adjust the angle in the up-and-down direction according to the operating conditions and the process.

[0003] The conventional art has a problem in configuration in that the setting position of the air knife is narrow and interferes with the surrounding equipment, so that the angle of the air knife cannot be smoothly adjusted. In addition, the up-and-down angle of the air knife cannot be accurately measured during the operation, and the production efficiency can be decreased.

[0004] As related patent documents, reference can be made to 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). SUMMARY

[0005] Embodiments of the present application aim to smoothly adjust the up-and-down angle of the air knife. In addition, it aims to accurately measure the angle of the air knife adjusted.

[0006] The problems to be solved are not limited thereto, and the skilled person can clearly understand other problems not mentioned from the following description.

[0007] According to an embodiment of the present application, there can be provided a gas knife system including a gas knife that sprays gas toward a plated steel sheet; first and second gas inlet pipes that protrude in a left-right direction from each of positions corresponding to each other on both side surfaces of the gas knife; a main body that is disposed above the gas knife and has first and second supports that rotatably support the first and second gas inlet pipes, respectively, with a pipe center as a reference; and an angle adjusting device that adjusts an up-down angle of the gas knife with respect to the plated steel sheet by rotating the first gas inlet pipe so that the gas knife rotates with the pipe center as the reference, the angle adjusting device including a fixed body that is provided to the first support and is located in front of or behind the first gas inlet pipe; a screw shaft that is rotatably provided to the fixed body with an up-down direction shaft as a center and is rotated by a shaft driving unit; a moving body that is threadedly coupled to the screw shaft and is movable in the up-down direction according to a rotation direction of the screw shaft; and an angle adjusting lever that has a first end portion coupled to the first gas inlet pipe and has a second end portion connected to the moving body by a power transmission unit, the power transmission unit transmitting a moving force of the moving body to the angle adjusting lever to rotate the angle adjusting lever.

[0008] The power transmission unit can include a shaft member rotatably provided to the moving body with a left-right direction shaft as a center; a rotating body provided to the shaft member to rotate together with the shaft member; and a slider movably provided to the rotating body in a radial direction of the pipe center and coupled to the second end portion of the angle adjusting lever.

[0009] The shaft driving unit can include a driving motor; a speed reducer that reduces a rotation speed of the driving motor; and a transmission shaft that transmits a rotation force output from the speed reducer to the screw shaft.

[0010] The gas knife system can further include a first angle measuring device. The first angle measuring device can include a first gear member provided to the angle adjusting lever and having gear teeth of a pinion gear provided along an outer circumference with the pipe center as a reference, the gear teeth being disposed in front of or behind the first gas inlet pipe; a second gear member extending in the up-down direction with an upper end portion located at the main body side and having gear teeth of a rack provided at a lower end portion engaged with the gear teeth of the first gear member; a guide module connected to the fixed body and supporting the second gear member to be movable in the up-down direction; a scale body provided at the main body at the upper end portion side of the second gear member and having a scale for showing a rotation angle of the gas knife; and a scale indicator provided at the upper end portion of the second gear member and moved in the up-down direction according to rotation of the angle adjusting lever to indicate the scale.

[0011] The guide module can include an auxiliary body connected to the fixed body, a support member movably supporting the second gear member in the up and down direction, and at least one elastic member applying an elastic force to the support member toward the first gear member side between the auxiliary body and the support member.

[0012] The gas knife system can further include a second angle measuring device. The second angle measuring device can include a measuring jig provided to the second intake pipe and provided with first gear teeth along the outer periphery with reference to the pipe center, a measuring module provided with a rotating member provided with second gear teeth engaged with the first gear teeth in the outer periphery and detecting the rotation amount of the rotating member, a module holder holding the measuring module and provided to be rotatable about a hinge shaft parallel to the pipe center to separate or approach the rotating member with respect to the measuring jig according to the rotation direction, a mounting bracket provided to the second bracket and holding the hinge shaft and provided such that the module holder is located between the mounting bracket and the measuring jig, and at least one elastic member applying an elastic force to the module holder toward the measuring jig side between the module holder and the mounting bracket 137.

[0013] The means for solving the problem will become more specific and clear through the embodiments, drawings, etc. described below. In addition, various means for solving the problem other than the means mentioned below will be disclosed below.

[0014] According to the embodiment of the present application, the angle of the gas knife can be smoothly adjusted in the up and down direction. In addition, the rotation angle of the gas knife can be accurately measured.

[0015] The effects of the invention are not limited to the above, and a person skilled in the art can clearly understand other effects not mentioned from the present specification and the attached drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a front view showing a gas knife system according to an embodiment of the present application.

[0017] Figure 2 is Figure 1 A-A line cross-sectional view of

[0018] Figure 3 is Figure 2 B-B line cross-sectional view of

[0019] Figure 4 and Figure 5 is a schematic view showing the operation of an angle adjusting device in a gas knife system according to an embodiment of the present application.

[0020] Figure 6 isFigure 1 CC line cross-section diagram.

[0021] Figure 7 yes Figure 1 DD line cross-sectional view.

[0022] (Explanation of Reference Numerals)

[0023] 10: Air Knife

[0024] 15A, 15B: Intake pipe

[0025] 15c: Tube center

[0026] 20: Main body

[0027] 110: Angle adjustment device

[0028] 120: First angle measuring device

[0029] 130: Second angle measuring device DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0031] An air knife system according to an embodiment of the present invention is shown in Figures 1 to 7 The air knife system according to the 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 The overall structure of the air knife system according to an embodiment of the present invention is shown. Figure 2 as well as Figure 3 Mainly shown is the structure of the angle adjustment device 110 . Figure 4 as well as Figure 5 based on Figure 2 The operation of the angle adjustment device 110 is schematically illustrated. Figure 6 The first angle measuring device 120 is mainly shown. Figure 7 Mainly shown is the second angle determination device 130 .

[0032] Reference Figure 1The gas knife system according to the embodiment of the present application can include: a gas knife 10 that sprays a gas (e.g., air) toward a plated steel sheet (not shown); a first gas inlet pipe 15A that protrudes to the left side and extends along the left-right direction from each of positions corresponding to each other on both side surfaces of the gas knife 10, and a second gas inlet pipe 15B that protrudes to the right side; a main body 20 that is disposed above the gas knife 10 and has a first support 21A and a second support 21B that rotatably support the first gas inlet pipe 15A and the second gas inlet pipe 15B, respectively, with a pipe center 15c as a reference; and the angle adjusting device 110 that adjusts the up-down angle (i.e., gas spraying angle) of the gas knife 10 with respect to the plated steel sheet by rotating the first gas inlet pipe 15A so that the gas knife 10 rotates with the pipe center 15c as a reference.

[0033] In a molten plating process, the gas knife 10 can be located at the rear end of a plating bath (not shown). A steel sheet (not shown) can be immersed in a molten metal (e.g., zinc (Zn), etc.) in the plating bath to become the plated steel sheet on which the molten metal is attached to the surface. The gas knife 10 can spray the gas at high pressure toward the plated steel sheet passing through the plating bath to adjust the amount of the molten metal (plating amount) attached to the plated steel sheet.

[0034] The first gas inlet pipe 15A and the second gas inlet pipe 15B can be linear and can be coupled to both side surfaces of the gas knife 10 to rotate together with the gas knife 10. The center of the first gas inlet pipe 15A and the center of the second gas inlet pipe 15B can coincide with each other when viewed from the side to provide the pipe center 15c.

[0035] The main body 20 can be configured to have a flow path for delivering the gas, and the flow path can be connected with a high-pressure gas supply source (not shown) that supplies the gas. The main body 20 can include a frame of a pipe structure that provides the flow path. The frame of the pipe structure can be fixed in position by a mounting frame (not shown).

[0036] In Figure 1 , reference numeral 30 is a gas delivery pipe. The gas delivery pipe 30 connects the first gas inlet pipe 15A and the second gas inlet pipe 15B with the flow path, respectively, so that the gas supplied from the high-pressure gas supply source to the flow path can flow into and out of the first gas inlet pipe 15A and the second gas inlet pipe 15B, respectively. The gas can be introduced to the gas knife 10 through the first gas inlet pipe 15A and the second gas inlet pipe 15B and sprayed toward the plated steel sheet by the gas knife 10.

[0037] The gas delivery pipe 30, which is a pipe connected to the end of the first gas inlet pipe 15A and the end of the second gas inlet pipe 15B, respectively, can include an elbow. The end of the first gas inlet pipe 15A and the end of the second gas inlet pipe 15B can be rotatably coupled to the elbow with the pipe center 15c as a reference, respectively.

[0038] Referring to Figures 2 to 5 , the angle adjusting device 110 can include a fixed body 111 provided at a first side (or, a second side facing the right side of the gas knife 10) of the left side of the first bracket 21A and located in front of (or, behind) the first gas inlet pipe 15A, a screw shaft 112 rotatably provided at the fixed body 111 with an axis Al in the up-down direction as a center and having an external thread 112t formed on the outer circumference, a moving body 113 having an internal thread 113t corresponding to the external thread 112t of the screw shaft 112 to be threadedly coupled to the screw shaft 112 and being movable in the up-down direction according to the rotation direction of the screw shaft 112, a shaft driving unit 114 rotating the screw shaft 112 in the forward and reverse directions, a shaft member 115 rotatably provided at the left side of the moving body 113 with an axis A2 in the left-right direction as a center, a rotating body 116 provided on the shaft member 115 to rotate together with the shaft member 115, a linear slide rail (slider) 117 movably provided at the rotating body 116 in the radial direction of the pipe center 15c, and an angle adjusting rod 118 having first and second end portions 118a and 118b coupled to the first gas inlet pipe 15A and the slide rail 117, respectively.

[0039] Referring to Figure 3 , the fixed body 111 can be formed to have a size in the up-down direction approximately equal to the length of the screw shaft 112. The fixed body 111 can be provided at the upper end portion with a rotation support member 111b such as a bearing rotatably supporting the upper head of the screw shaft 112.

[0040] The screw shaft 112 can have the external thread 112t at the lower body, and the moving body 113 can have a threaded hole passing through in the up-down direction and having the internal thread 113t. The moving body 113 can be formed to be rotated together with the screw shaft 112 to be restricted by contact with the fixed body 111, etc.

[0041] Referring to Figure 1 , Figure 2The shaft driving unit 114 can include a driving motor 114a that provides a rotational force, a speed reducer 114b that outputs the rotational speed of the driving motor 114a after reducing the rotational speed, and a power transmission shaft 114c that transmits the rotational force output from the speed reducer 114b to the screw shaft 112.

[0042] The driving motor 114a can be mounted to the frame of the duct structure of the main body 20. The speed reducer 114b can have an input shaft connected to the driving motor 114a and an output shaft connected to the power transmission shaft 114c, and can have a plurality of gears provided between the input shaft and the output shaft in order to reduce the rotational speed of the driving motor 114a. The power transmission shaft 114c can include a universal joint or the like, according to the positional relationship between the speed reducer 114b and the screw shaft 112, or the like.

[0043] The shaft driving unit 114 can be intermittently connected by a clutch or the like, or the input shaft of the speed reducer 114b can be connected to a handle for manual operation. Therefore, if necessary, the power transmission between the driving motor 114a and the speed reducer 114b can be cut off, and the screw shaft 112 can be rotated using the handle.

[0044] Referring to Figure 3 The shaft member 115, the rotating body 116, and the slide rail 117 constitute a power transmission unit. That is, the shaft member 115, the rotating body 116, and the slide rail 117 can connect the mobile body 113 and the second end portion 118b of the angle adjustment lever 118 between the mobile body 113 and the angle adjustment lever 118, and transmit the upward and downward movement force of the mobile body 113 to the angle adjustment lever 118 to rotate the angle adjustment lever 118. Referring to Figure 1 、 Figure 4 The angle adjustment lever 118 can be connected to the second face (or the first face) on the right side of the first face and the second face on the left side of the second face of the second end portion 118b.

[0045] The slide rail 117 can have a base portion and a rail portion on the base portion. The base portion of the slide rail 117 can be coupled to the second end portion 118b of the angle adjustment lever 118, and the rail portion of the slide rail 117 can be slidably coupled to the rotating body 116. The rotating body 116 can have a slide groove 116g (refer to Figure 5 ) to which the rail portion of the slide rail 117 is slidably coupled. As shown in Figure 4 and Figure 5 , the slide groove 116g of the rotating body 116 can be formed orthogonal to the axis A2 in the left-right direction.

[0046] As shown in Figure 4 and Figure 5 , the angle adjustment lever 118 can be fixed to the outer circumference of the first intake pipe 15A in a nested state with the first end portion 118a at the first end portion 118a to rotate together with the first intake pipe 15A. The angle adjustment lever 118 can have an insertion hole 118h (refer to Figure 6 ) formed through in the left-right direction and embedded in the first intake pipe 15A at the first end portion 118a.

[0047] As shown in Figure 4 and the like, the angle adjustment lever 118 can be divided into a first unit body 118-1 including a portion of the first end portion 118a and a second unit body 118-2 including the remaining portion of the first end portion 118a and the second end portion 118b, with reference to the center of the insertion hole 118h (refer to the pipe center 15c), in order to easily couple with the first intake pipe 15A, and the first unit body 118-1 and the second unit body 118-2 are assembled to each other by a bolt 118-3 (refer to Figure 6 ) to provide the insertion hole 118h. The first unit body 118-1 and the second unit body 118-2 can press the first intake pipe 15A embedded in the insertion hole 118h by tightening the bolt 118-3. As shown in Figure 6 , in order to improve the coupling force with the first intake pipe 15A, the angle adjustment lever 118 can have at least one fixing protrusion 118p protruding from the inner circumference of the insertion hole 118h.

[0048] If the screw shaft 112 is rotated by the shaft driving unit 114 with the up-and-down direction shaft Al as the center, the moving body 113 can move upward or downward along the up-and-down direction shaft Al, and the angle adjusting lever 118 can rotate upward or downward with the pipe center 15c as the reference by receiving the moving force of the moving body 113 through the shaft member 115, the rotating body 116, and the slide rail 117. In this process, in the power transmission unit between the moving body 113 capable of linear motion and the angle adjusting lever 118 capable of rotational motion, the shaft member 115 and the rotating body 116 rotate with the left-and-right direction shaft A2 as the center, and the slide rail 117 moves along the radial direction of the pipe center 15c to change the connection position of the second end portion 118b with respect to the rotating body 116, thereby allowing the angle adjusting lever 118 to rotate based on the rotational radius.

[0049] Specifically, if the moving body 113 moves upward or downward, the shaft member 115 and the rotating body 116 can rotate upward or downward with the left-and-right direction shaft A2 as the center while moving together with the moving body 113, and the slide rail 117 can move along the radial direction of the pipe center 15c to be spaced apart from or close to the pipe center 15c (see FIG. 6) while moving together with the moving body 113 and rotating together with the rotating body 116 (i.e., the slide rail 117 rotates such that the length direction thereof coincides with the radial direction of the pipe center 15c as the up-and-down position changes). Figure 4 and Figure 5 At this time, the angle adjusting lever 118 can rotate upward or downward with the pipe center 15c as the reference to rotate the first air inlet pipe 15A upward or downward with the pipe center 15c as the reference, thereby rotating the air knife 10 upward or downward with the pipe center 15c as the reference. Therefore, the air knife system according to the embodiment of the present application can change the up-and-down angle of the air knife 10 with respect to the plated steel sheet to a desired angle.

[0050] Figure 4 The state in which the moving body 113 moves downward, the shaft member 115 and the rotating body 116 rotate downward, and the slide rail 117 moves in the direction close to the pipe center 15c, thereby rotating the first air inlet pipe 15A downward with the pipe center 15c as the reference and adjusting the angle of the air knife 10 with respect to the plated steel sheet to be downward, is shown. In contrast thereto, Figure 5The following states are shown: the mobile body 113 moves upward, the shaft member 115 and the rotating body 116 rotate upward, the slide rail 117 moves in a direction away from the pipe center 15c, and thus the first intake pipe 15A rotates upward with the pipe center 15c as a reference, and the angle of the air knife 10 with respect to the plated steel sheet is adjusted to be upward.

[0051] The first angle measuring device 120 can display the rotation angle of the air knife 10 adjusted by the angle adjusting device 110 so that it can be visually confirmed by an operator or the like.

[0052] Referring to Figure 1 and Figure 6 , the first angle measuring device 120 can include: a first gear member 122 provided to the angle adjusting lever 118 and having gear teeth of a pinion provided along an outer periphery with the pipe center 15c as a reference, the gear teeth being disposed in front of or behind the first intake pipe 15A; a second gear member 123 disposed as a rack extending in the up-down direction with the upper end portion adjacent to the main body 20, and having gear teeth of the rack disposed at the lower end portion engaged with the gear teeth of the first gear member 122; a guide module (see reference numerals 121, 126, and 127) connected to the fixed body 111 and supporting the second gear member 123 so as to be movable in the up-down direction; a scale body 125 provided to the main body 20 and disposed adjacent to the upper end portion of the second gear member 123, and having a scale for showing the rotation angle of the air knife 10; and a scale indicator 124 disposed at the upper end portion of the second gear member 123 and moved in the up-down direction according to the rotation of the angle adjusting lever 118 to indicate the scale corresponding to the rotation angle of the air knife 10.

[0053] According to such a first angle measuring device 120, if the angle adjusting device 110 is operated to rotate the angle adjusting lever 118 in order to adjust the angle of the air knife 10, the first gear member 122 rotates with the pipe center 15c as a reference together with the angle adjusting lever 118, the second gear member 123 moves upward or downward, and the scale indicator 124 moves together with the second gear member 123 to indicate the scale corresponding to the rotation angle of the air knife 10, so that an operator or the like can confirm the rotation angle of the air knife 10 through the scale indicated by the scale indicator 124.

[0054] The first gear member 122 can be disposed at the first surface (or the second surface on the right side) of the angle adjusting lever 118 and rotate together with the angle adjusting lever 118.

[0055] The guide module can be located opposite the fixed body 111 with the angle adjustment rod 118 as a reference. Therefore, the angle adjustment rod 118 can be located between the fixed body 111 and the guide module.

[0056] Referring to Figure 6 , the guide module can include an auxiliary body 121 connected to the fixed body 111 to be fixed in position, a support member 126 having a guide hole to support the second gear member 123 to be movable up and down, and at least one elastic member 127 to impart an elastic force to the support member 126 toward the first gear member 122 between the auxiliary body 121 and the support member 126, so that the gear teeth of the first gear member 122 and the gear teeth of the second gear member 123 are in close contact.

[0057] The elastic member 127 can be a spring or the like. The elastic member 127 elastically pushes the second gear member 123 toward the first gear member 122 through the support member 126, thereby being able to prevent backlash that can occur between the gear teeth of the first gear member 122 and the gear teeth of the second gear member 123. Thus, the rotation angle measurement of the air knife 10 using the first gear member 122 and the second gear member 123 can be more accurately achieved.

[0058] On the other hand, as Figure 6 shown, it can be that an insertion groove 123a is formed in the second gear member 123 in the up-and-down direction, and an insertion protrusion 126a that is slidable along the insertion groove 123a and inserted into the insertion groove 123a is 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 be more stably moved in the up-and-down direction without shaking.

[0059] The second angle measurement device 130 can measure the rotation angle of the air knife 10 adjusted by the angle adjustment device 110 and provide it to the cab.

[0060] Referring to Figure 7The second angle measuring device 130 can include a measuring jig 131 provided to the second intake pipe 15B and provided with first gear teeth 131a along the outer periphery with reference to the pipe center 15c, a measuring module 132 provided with a rotating member provided with second gear teeth 132a engaged with the first gear teeth 131a, and detecting the rotation amount of the rotating member for the rotation angle measurement of the air knife 10 and transmitting the detected value to the cab wirelessly or by wire, a module holder 135 holding the measuring module 132 and provided so as to be rotatable about a hinge shaft 136 parallel to the pipe center 15c to separate or approach the rotating member with respect to the measuring jig 131 according to the rotation direction, a mounting bracket 137 provided to the second support 21B and holding the hinge shaft 136, and configured such that the module holder 135 is located between the mounting bracket 137 and the measuring jig 131, and at least one elastic member 138 imparting an elastic force to the module holder 135 toward the measuring jig 131 between the module holder 135 and the mounting bracket 137 to make the first gear teeth 131a and the second gear teeth 132a close.

[0061] The measuring jig 131 can be disposed on the right side (or the left side) with reference to the second support 21B, and the mounting bracket 137 can be coupled to the second face (or the first face toward the left side of the air knife 10) of the two side faces of the second support 21B.

[0062] The measuring module 132 can be provided with an encoder or the like for detecting the rotation amount of the rotating member. The rotating member of the measuring module 132 can be a spur gear, and the first gear teeth 131a can be gear teeth of the spur gear. The rotating member can have a smaller radius of rotation than the measuring jig 131.

[0063] On the other hand, the measuring jig 131 can be fixed in a state of being nested in the outer periphery of the second intake pipe 15B and rotated together with the second intake pipe 15B. The measuring jig 131 can be divided into two parts with reference to the pipe center 15c and assembled to each other by a bolt for easy coupling with the second intake pipe 15B, and the second intake pipe 15B can be compressed by tightening the bolt.

[0064] The elastic member 138 of the second angle measuring device 130 can be a spring or the like. The elastic member 138 elastically pushes the rotating member (a flat gear) of the measuring module 132 to the side of the first gear teeth 131a of the measuring jig 131 through the module holder 135, thereby being able to prevent backlash that can occur between the first gear teeth 131a and the second gear teeth 132a. Thus, the rotation angle measurement of the air knife 10 using the measuring jig 131 having the first gear teeth 131a and the measuring module 132 having the second gear teeth 132a can be more accurately performed.

[0065] In Figure 7 , reference numerals 133, 134A, 134B are sensing modules for sensing upper and lower limit rotation angles of the air knife 10. The sensing modules can be used to prevent the air knife 10 from being rotated beyond the rotation allowance range by the angle adjusting device 110.

[0066] Reference numeral 133 is a reference member provided to the measuring jig 131, and reference numerals 134A, 134B are first and second sensors that sense whether the reference member 133 rotating together with the measuring jig 131 is located at positions corresponding to the upper and lower limit rotation angles of the air knife 10, respectively.

[0067] The first and second sensors 134A, 134B can be contact-type sensors such as limit switches. Alternatively, the first and second sensors 134A, 134B can be non-contact-type sensors such as optical sensors. When optical sensors are used, for example, the reference member 133 can be configured to be able to reflect light from each of the first and second sensors 134A, 134B.

[0068] The present application has been described above, but the present application is not limited to the disclosed embodiments and the accompanying drawings, and various modifications can be made by those skilled in the art without departing from the technical idea of the present application.

Claims

1. An air knife system, comprising: A gas knife (10) that sprays gas toward a plated steel sheet; first and second gas inlet pipes (15A and 15B) that protrude in a left-right direction from each of positions corresponding to each other on both side surfaces of the gas knife (10); a main body (20) that is provided above the gas knife (10) and has first and second supports (21A and 21B) that rotatably support the first and second gas inlet pipes (15A and 15B) about pipe centers (15c), respectively; and an angle adjustment device (110) that adjusts an up-down angle of the gas knife (10) with respect to the plated steel sheet by rotating the gas knife (10) about the pipe centers (15c) by rotating the first gas inlet pipe (15A), The angle adjustment device (110) includes: a fixed body (111) that is provided to the first support (21A) and is located in front of or behind the first gas inlet pipe (15A); a screw shaft (112) that is rotatably provided to the fixed body (111) about an up-down axis (A1) and is rotated by an axis drive unit (114); a moving body (113) that is threadedly coupled to the screw shaft (112) and is movable in the up-down direction according to a rotation direction of the screw shaft (112); an angle adjustment lever (118) that has a first end portion (118a) coupled to the first gas inlet pipe (15A) and has a second end portion (118b) connected to the moving body (113) by a power transmission unit, the power transmission unit transmits a moving force of the moving body (113) to the angle adjustment lever (118) to rotate the angle adjustment lever (118), the power transmission unit includes: a shaft member (115) that is rotatably provided to the moving body (113) about a left-right axis (A2); a rotating body (116) that is provided to the shaft member (115) to rotate together with the shaft member (115); and a slider (117) that is movably provided to the rotating body (116) in a radial direction of the pipe center (15c) and is coupled to the second end portion (118b) of the angle adjustment lever (118).

2. The gas knife system according to claim 1, wherein the axis drive unit (114) includes: a drive motor (114a); a speed reducer (114b) that reduces a rotation speed of the drive motor (114a); and a transmission shaft (114c) that transmits a rotation force output from the speed reducer (114b) to the screw shaft (112).

3. The gas knife system according to claim 1, further comprising first angle measurement means (120), the first angle measurement means (120) includes: ​ ​ A first gear member (122) is provided to the angle adjustment lever (118) and has gear teeth of a pinion gear provided along an outer periphery with the pipe center (15c) as a reference, the gear teeth being disposed in front of or behind the first intake pipe (15A); A second gear member (123) extends in the up-down direction with an upper end portion on the main body (20) side and has gear teeth of a rack gear engaged with the gear teeth of the first gear member (122) provided to a lower end portion; A guide module is connected to the fixed body (111) and supports the second gear member (123) so as to be movable in the up-down direction; A scale body (125) is provided to the main body (20) on the upper end portion side of the second gear member (123) and has a scale for showing the rotation angle of the air knife (10); and A scale indicator (124) is provided to the upper end portion of the second gear member (123) and moves in the up-down direction according to the rotation of the angle adjustment lever (118) to indicate the scale.

4. The air knife system according to claim 3, wherein the guide module includes: 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; and at least one elastic member (127) imparting an elastic force to the support member (126) toward the first gear member (122) side between the auxiliary body (121) and the support member (126).

5. The air knife system according to claim 1, wherein the air knife system further includes a second angle measuring device (130), the second angle measuring device (130) includes: a measuring jig (131) provided to the second intake pipe (15B) and having first gear teeth (131a) provided along an outer periphery with the pipe center (15c) as a reference; a measuring module (132) having a rotating element with second gear teeth (132a) provided to an outer periphery so as to be engaged with the first gear teeth (131a) and detecting the amount of rotation of the rotating element; a module holder (135) holding the measuring module (132) and disposed so as to be rotatable about a hinge shaft (136) parallel to the pipe center (15c) to separate or approach the rotating element with respect to the measuring jig (131) according to the direction of rotation; a mounting bracket (137) provided to the second bracket (21B) and holding the hinge shaft (136) and disposed so that the module holder (135) is located between the mounting bracket (137) and the measuring jig (131); and at least one elastic member (138) imparting an elastic force to the module holder (135) toward the measuring jig (131) side between the module holder (135) and the mounting bracket (137).

Images