Air knife opening and closing transmission device

Abstract

The utility model relates to the technical field of metal surface treatment devices, and provides an air knife opening and closing transmission device which comprises an outer beam, the length direction of the outer beam is defined as the longitudinal direction, the direction perpendicular to the length direction of the beam in the horizontal direction is defined as the transverse direction, an inner beam is transversely arranged on the outer beam in a sliding mode, and a knife body is arranged on the inner beam in a swinging mode. The second rotation driving part is arranged on the outer beam, the first lead screw is rotationally arranged on the outer beam, the rotating shaft drives the first lead screw to rotate in the transverse direction, the first nut is arranged on the inner beam, and the first nut is in threaded fit with the first lead screw. According to the technical scheme, the problem that in the prior art, the opening and closing distance and precision of the air knife are difficult to adjust accurately is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal surface treatment devices, and more specifically, to a pneumatic knife opening and closing transmission device. Background Art

[0002] A pneumatic knife is an industrial device widely used in various applications that require directional and high-speed airflows. Its working principle is to convert compressed air into a thin and powerful airflow, which can be used to remove moisture, dust, or other impurities on the surface of an object, or to control the coating or the thickness of a metal coating in a coating process. The pneumatic knife beam is a component of the pneumatic knife, usually referring to the structure that supports the pneumatic knife and ensures its correct position and angle. In the prior art, the opening and closing of the pneumatic knife usually refer to the distance between the pneumatic knife and the workpiece. When it is close, it is in a closed state. Among them, in the process of determining the thickness of zinc or other metals plated on the surface of a metal plate, since it is necessary to always maintain the fluidity of the surface coating metal material, the overall pneumatic knife thickness determination process needs to be carried out at a temperature of 300-500°C. The pneumatic knife is prone to position deviation under high temperature and high airflow conditions, thus affecting the accuracy of the final coating thickness determination. And after the position of the pneumatic knife in the opening and closing state deviates, it is difficult to achieve precise adjustment with the simple cooperation of the beam and the pneumatic knife in the prior art. Summary of the Utility Model

[0003] The utility model provides a pneumatic knife opening and closing transmission device, which solves the problem that it is difficult to accurately adjust the opening and closing distance and accuracy of the pneumatic knife in the related art.

[0004] The technical solution of the utility model is as follows:

[0005] A pneumatic knife opening and closing transmission device for determining the thickness of the surface coating of a galvanized sheet, comprising:

[0006] An outer beam, defining the length direction of the outer beam as the longitudinal direction and the direction perpendicular to the length direction of the beam in the horizontal direction as the transverse direction.

[0007] An inner beam, the inner beam is slidably arranged transversely on the outer beam.

[0008] A knife body, the knife body is swingably arranged on the inner beam.

[0009] A second rotation driving member, the second rotation driving member is arranged on the outer beam.

[0010] A first lead screw, the first lead screw is rotatably arranged on the outer beam, and the axis of rotation is along the transverse direction. The output end of the second rotation driving member drives the first lead screw to rotate.

[0011] A first lead nut, the first lead nut is arranged on the inner beam, and the first lead nut is in threaded cooperation with the first lead screw.

[0012] As a further technical solution, it further includes:

[0013] A worm, the worm is rotatably arranged on the outer beam, and its axis is perpendicular to the axis of the first lead screw.

[0014] A worm gear, the worm gear is arranged on the first lead screw and meshes with the worm.

[0015] As a further technical solution, there are two first lead screws, which are respectively rotatably arranged at both ends of the outer beam. Both of the two first lead screws are connected with the worm gear and the worm. It further includes:

[0016] A transmission rod, both ends of the transmission rod are respectively in transmission connection with the two worms.

[0017] As a further technical solution, a tool body is swingably arranged at one end of the inner beam, and the tool body has an arc-shaped rack portion. It further includes:

[0018] A first rotation driving member, the first rotation driving member is arranged on the outer beam, and its output end is in transmission connection with the tool body to drive the tool body to swing.

[0019] A rotating transmission shaft, the rotating transmission shaft is rotatably arranged on the inner beam and has a gear portion. The output end of the first rotation driving member is in transmission connection with the rotating transmission shaft, and the gear portion meshes with the arc-shaped rack portion to drive the tool body to rotate after the rotating transmission shaft rotates.

[0020] As a further technical solution, one end of the inner beam has an arc-shaped scale groove, the arc-shaped scale groove is concentrically arranged with the rotation shaft of the tool body, and the rotation shaft of the tool body has an indicating portion, and the indicating portion points to the arc-shaped scale groove.

[0021] As a further technical solution, it further includes:

[0022] A longitudinal baffle slide carriage, the longitudinal baffle slide carriage is slidably arranged along the longitudinal direction on the outer beam.

[0023] A transverse baffle slide carriage, the transverse baffle slide carriage is slidably arranged transversely and longitudinally on the longitudinal baffle slide carriage.

[0024] A third nut, the third nut is arranged on the transverse baffle slide carriage.

[0025] A third lead screw, the third lead screw is rotatably arranged on the longitudinal baffle slide carriage and is used to drive the third nut to slide transversely after rotation.

[0026] As a further technical solution, it further includes:

[0027] The material guiding member is longitudinally slidably arranged on the transverse baffle slide.

[0028] The baffle member moves along with the longitudinal baffle slide. The baffle member has a blocking portion for blocking the galvanized sheet. A material guiding space is formed between two groups of the baffle members.

[0029] The material guiding roller is rotatably arranged on the material guiding member and is located on one side of the material guiding space.

[0030] One end of the first elastic member is arranged on the material guiding member, and the other end is arranged on the transverse baffle slide, providing a force for the material guiding member to slide into the material guiding space.

[0031] As a further technical solution, the tool body has a gas outlet facing the material guiding space, and further includes:

[0032] The cleaning and scraping member is longitudinally slidably arranged on the tool body. The cleaning and scraping member has a scraping portion, and one end of the scraping portion extends into the gas outlet.

[0033] As a further technical solution, the second rotation driving member and the first lead screw are connected by a universal joint.

[0034] The working principle and beneficial effects of the present utility model are as follows:

[0035] In the present utility model, there is a fixed outer beam and an inner beam that is horizontally slidably arranged on the outer beam. The tool body is connected to the inner beam through a hinge point to form a swinging structure, allowing the tool body to swing within a certain angle range to adjust the contact angle between the air knife and the surface of the galvanized sheet. The front end of the tool body is provided with a flat air flow ejection port for converting compressed air into a high-speed and uniform air flow sheet. The second rotation driving member uses a servo motor. The axis of the first lead screw is arranged horizontally, passing through the outer beam and rotatably connected thereto. The pitch of the lead screw is precisely designed to ensure that the horizontal movement distance of the inner beam can be accurately controlled during rotation. The thread on the surface of the lead screw has high precision and forms a stable thread fit with the first lead nut, ensuring the smoothness and accuracy of the movement of the inner beam. Through the combination of the second rotation driving member, the first lead screw, and the first lead nut, the precise position adjustment of the inner beam in the horizontal direction is achieved, improving the precision and stability of the coating thickness control, and being applicable to industrial production environments with high requirements for coating uniformity and thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following will further illustrate the above characteristics, technical features, advantages and their implementation manners of the present utility model in a clear and understandable manner in combination with the drawings of the preferred embodiments.

[0037] Figure 1 It is a schematic structural diagram of the present utility model.

[0038] Figure 2 is Figure 1 Schematic diagram of the partial enlarged structure of C in

[0039] Figure 3 Schematic diagram of the structure at the first lead screw in the present utility model;

[0040] Figure 4 is Figure 3 Schematic diagram of the partial enlarged structure in

[0041] Figure 5 is Figure 1 Schematic diagram of the partial enlarged structure of B in

[0042] Figure 6 is Figure 1 Schematic diagram of the partial enlarged structure of D in

[0043] Figure 7 is Figure 1 Schematic diagram of the partial enlarged structure of E in

[0044] In the figure: outer beam - 1, inner beam - 2, arc scale groove - 201, tool body - 3, arc rack part - 301, indicating part - 302, gas outlet - 303, second rotation driving member - 4, first lead screw - 5, first lead nut - 6, worm - 7, worm gear - 8, transmission rod - 9, first rotation driving member - 10, rotation transmission shaft - 11, gear part - 1101, longitudinal baffle carriage - 12, transverse baffle carriage - 13, third lead nut - 14, third lead screw - 15, material guiding member - 16, baffle member - 17, material guiding space - 1701, material guiding roller - 18, first elastic member - 19, cleaning scraping member - 20, scraping part - 2001. Specific embodiments

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the specific embodiments of the present utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, and other embodiments can also be obtained.

[0046] To make the drawings concise, only the parts related to the utility model are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, components with the same structure or function are only schematically shown for one of them, or only one of them is marked. In this article, "one" not only means "only this one", but also can mean "more than one" situation, and "several" includes "two" and "more than two".

[0047] In this text, it should be noted that unless otherwise clearly stipulated and defined, the terms "installation", "connection", and "linkage" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific situations.

[0048] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0049] Referring to Figures 1 to 7 , an embodiment of the present utility model provides an air knife opening and closing transmission device, which includes an outer beam 1. The length direction of the outer beam 1 is defined as the longitudinal direction, and the direction perpendicular to the length direction of the beam in the horizontal direction is defined as the transverse direction. An inner beam 2 is slidably arranged transversely on the outer beam 1. A knife body 3 is swingably arranged on the inner beam 2. A second rotation driving member 4 is arranged on the outer beam 1. A first lead screw 5 is rotatably arranged on the outer beam 1, and the axis of the rotating shaft is along the transverse direction. The output end of the second rotation driving member 4 drives the first lead screw 5 to rotate. A first nut 6 is arranged on the inner beam 2, and the first nut 6 is in threaded cooperation with the first lead screw 5.

[0050] In this embodiment, considering that the process of determining the thickness of the surface coating of a galvanized sheet needs to be carried out at a certain high temperature. In the prior art, a single air knife is arranged on the overall frame. High temperature and air flow are likely to cause an angular deviation between the air knife and the galvanized sheet, making it difficult to perform precise corresponding adjustment, thus affecting the final thickness determination effect. This solution is provided with a fixedly arranged outer beam 1 and an inner beam 2 slidably arranged transversely on the outer beam 1. The knife body 3 is connected to the inner beam 2 through a hinge point to form a swing structure, allowing the knife body 3 to swing within a certain angle range to adjust the contact angle between the air knife and the surface of the galvanized sheet. The front end of the knife body 3 is provided with a flat air flow ejection port for converting compressed air into a high-speed and uniform air flow sheet. The second rotation driving member 4 adopts a servo motor. The axis of the first lead screw 5 is arranged along the transverse direction, passing through the outer beam 1 and rotatably connected thereto. The pitch of the lead screw is precisely designed to ensure that the transverse movement distance of the inner beam 2 can be accurately controlled during rotation. The thread on the surface of the lead screw has high precision and forms a stable threaded cooperation with the first nut 6 to ensure the smoothness and accuracy of the movement of the inner beam 2. Through the combination of the second rotation driving member 4, the first lead screw 5, and the first nut 6, the precise position adjustment of the inner beam 2 in the transverse direction is realized, improving the precision and stability of the coating thickness control, and being applicable to industrial production environments with high requirements for coating uniformity and thickness.

[0051] Further, it further includes that a worm 7 is rotatably arranged on the outer beam 1, and its axis is perpendicular to the axis of the first lead screw 5, and a worm wheel 8 is arranged on the first lead screw 5 and meshes with the worm 7.

[0052] In this embodiment, a worm 7 and a worm wheel 8 cooperating therewith are additionally provided. The worm 7 is designed to be rotatably arranged on the outer beam 1, and its axis is perpendicular to the axis of the first lead screw 5. This vertical layout enables the rotation of the worm 7 to be effectively converted into the rotation of the worm wheel 8, thereby indirectly affecting the position change of the first lead screw 5. The worm wheel 8 is fixed on the first lead screw 5 and forms a good meshing relationship with the worm 7. When the worm 7 rotates, through the transmission between gears, the worm wheel 8 rotates accordingly, and then drives the first lead screw 5 to displace, ultimately achieving the purpose of adjusting the angle of the air knife. The worm 7 - worm wheel 8 mechanism has a self - locking function, and even after the driving stops, it can maintain the current adjustment position, ensuring the stability of the air knife angle. In addition, since the transmission ratio of the worm 7 - worm wheel 8 is usually large, only a relatively small force is required to achieve a large - angle adjustment, improving the convenience and efficiency of operation.

[0053] Further, there are two first lead screws 5, which are respectively rotatably arranged at both ends of the outer beam 1. Both of the two first lead screws 5 are connected with a worm wheel 8 and a worm 7. It further includes a transmission rod 9, and both ends of the transmission rod 9 are respectively in transmission connection with the two worms 7.

[0054] In this embodiment, the first lead screws 5 are designed to be two, and are respectively rotatably arranged at both ends of the outer beam 1. Such a layout can ensure that when the air knife adjusts the angle, both ends can move synchronously, avoiding the imbalance problem caused by single - point adjustment, and ensuring the overall stability and adjustment accuracy of the air knife. Each first lead screw 5 is connected with a worm wheel 8, and these two worm wheels 8 are respectively meshed with the two worms 7. Moreover, the two worms 7 are not symmetrically arranged, but are arranged side by side with the same thread direction, which can make the transmission directions at both ends the same. In order to make the rotation of the two worms 7 synchronous, this embodiment also introduces a transmission rod 9. Both ends of the transmission rod 9 are respectively in transmission connection with the two worms 7. In this way, when the operator rotates the transmission rod 9, the two worms 7 will be simultaneously subjected to the same driving force, ensuring that the worm wheels 8 on the two first lead screws 5 rotate synchronously, and then enabling the two first lead screws 5 to move synchronously, realizing the uniform adjustment of the air knife angle. This design of double lead screws + transmission rod 9 can not only improve the accuracy of air knife angle adjustment, but also effectively reduce the vibration and noise during the adjustment process, improving the stability and reliability of the entire system.

[0055] Further, a cutter body 3 is swingably arranged at one end of the inner beam 2. The cutter body 3 has an arc-shaped rack portion 301. The device further includes a first rotation driving member 10 which is arranged on the outer beam and whose output end is in transmission connection with the cutter body 3 to drive the cutter body 3 to swing. A rotation transmission shaft 11 is rotatably arranged on the inner beam 2 and has a gear portion 1101. The output end of the first rotation driving member 10 is in transmission connection with the rotation transmission shaft 11, and the gear portion 1101 meshes with the arc-shaped rack portion 301 to drive the cutter body 3 to rotate after the rotation transmission shaft 11 rotates.

[0056] In this embodiment, the arc-shaped rack portion 301 is arranged on one side of the rotation shaft of the cutter body 3 and is driven to rotate by the gear portion 1101 rotatably arranged on the inner beam 2. By introducing the cooperation of the rotation transmission shaft 11 with the gear portion 1101 and the arc-shaped rack portion 301, precise control of the angle of the cutter body 3 and stable transmission are achieved. The misaligned arrangement of the rotation shaft and the driving position of the cutter body 3 makes the position of the transmission connection point between the output end of the rotation driving device and the cutter body 3 more stable, not prone to breakage or deformation, and can also drive the swing of the cutter body 3 more labor-saving and smoothly.

[0057] Further, one end of the inner beam 2 has an arc-shaped scale groove 201 which is concentric with the rotation shaft of the cutter body 3. The rotation shaft of the cutter body 3 has an indicating portion 302 which points to the arc-shaped scale groove 201.

[0058] In this embodiment, an arc-shaped scale groove 201 is formed at one end of the inner beam 2 at a position concentric with the rotation shaft of the cutter body 3. This scale groove can ensure a perfect match with the swing track of the cutter body 3. Angle scales are evenly distributed on the scale groove, usually from 0° to ±15°, and each scale represents a specific angle value, which is convenient for the operator to quickly identify the current angle of the cutter body 3. The operator can monitor the angle of the cutter body 3 in real time by observing the cooperation between the indicating portion 302 and the arc-shaped scale groove 201 to ensure precise control of the coating thickness. Through the intuitive indicating system, the operation convenience and the controllability of the production process are improved, which is suitable for industrial production environments with high-precision requirements for coating thickness.

[0059] Further, the device further includes a longitudinal baffle slide carriage 12 which is slidably arranged on the outer beam 1 longitudinally. A transverse baffle slide carriage 13 is slidably arranged on the longitudinal baffle slide carriage 12 both transversely and longitudinally. A third wire nut 14 is arranged on the transverse baffle slide carriage 13. A third lead screw 15 is rotatably arranged on the longitudinal baffle slide carriage 12 and is used to drive the third wire nut 14 to slide transversely after rotation.

[0060] In this embodiment, the device is newly equipped with a transverse baffle carriage 13, a third lead nut 14, and a third lead screw 15, aiming to achieve precise control of the transverse position of the plate, thereby further enhancing the versatility and flexibility of the device. During the adjustment of the air knife angle, it ensures that plates of different shapes and sizes can receive comprehensive stable support and precise positioning. The third lead nut 14 is fixedly installed on the transverse baffle carriage 13 and forms a lead screw-nut pair with the third lead screw 15. The third lead screw 15 is rotatably arranged on the longitudinal baffle carriage 12, and its axial direction is consistent with the width direction of the plate. When it is necessary to adjust the transverse position of the transverse baffle carriage 13, only need to drive the third lead screw 15 to rotate through an external driving device such as a motor or a handwheel. The rotation of the third lead screw 15 will be converted into the transverse movement of the transverse baffle carriage 13 through the engaged third lead nut 14. This lead screw-nut transmission mechanism not only ensures the smoothness and precision of the adjustment process, but also greatly simplifies the operation process and improves work efficiency. By introducing the transverse baffle carriage 13, the third lead nut 14, and the third lead screw 15, the air knife angle adjustment device in this embodiment not only enhances the control ability of the plate position, but also broadens the applicable range, especially suitable for high-precision application occasions that require multi-dimensional positioning and adjustment of the plate, improving the production quality and production efficiency of the product.

[0061] Furthermore, it further includes a guiding member 16. The guiding member 16 is longitudinally slidably arranged on the transverse baffle carriage 13. The baffle member 17 moves along with the longitudinal baffle carriage. The baffle member 17 has a blocking portion for blocking the galvanized plate. A guiding space 1701 is formed between the two groups of baffle members 17. The guiding roller 18 is rotatably arranged on the guiding member 16 and is located on one side of the guiding space 1701. One end of the first elastic member 19 is arranged on the guiding member 16, and the other end is arranged on the transverse baffle carriage 13, providing a force for the guiding member 16 to slide into the guiding space 1701.

[0062] In this embodiment, the material guiding member 16 is designed to be longitudinally slidably disposed on the transverse baffle carriage 13. This design enables the material guiding member 16 to be flexibly adjusted according to the width of the plate, ensuring that the plate can obtain correct guiding and positioning before entering the action area of the air knife. The material guiding roller 18 is rotatably disposed on the material guiding member 16 and is located on one side of the material guiding space 1701. When the plate enters the material guiding space 1701, the material guiding roller 18 will contact the plate and guide it to move forward. The rotational design of the material guiding roller 18 reduces the friction between the plate and the material guiding member 16, ensuring that the plate can smoothly pass through the material guiding space 1701, avoiding the plate from shifting or jittering before entering the action area of the air knife, and improving the stability and accuracy of processing. One end of the first elastic member 19 is disposed on the material guiding member 16, and the other end is fixed to the transverse baffle carriage 13, providing a force for the material guiding member 16 to slide into the material guiding space 1701. This elastic pre-tightening force ensures that the material guiding roller 18 can always be in contact with the plate. Even when processing plates with different thicknesses, through the automatic adjustment of the first elastic member 19, the appropriate pressure between the material guiding roller 18 and the plate can be maintained, avoiding excessive friction or poor contact, thereby ensuring the smooth introduction and stable guiding of the plate. It not only optimizes the process of plate introduction and guiding but also improves the adaptability to plates of different sizes and thicknesses.

[0063] Furthermore, the tool body 3 has a gas outlet 303, and the gas outlet 303 faces the material guiding space 1701. It further includes a cleaning scraping member 20. The cleaning scraping member 20 is longitudinally slidably disposed on the tool body 3, and the cleaning scraping member 20 has a scraping portion 2001. One end of the scraping portion 2001 extends into the gas outlet 303.

[0064] In this embodiment, the gas outlet 303 of the tool body 3 faces the material guiding space 1701, which is the main channel for jetting high-pressure gas during the operation of the air knife and is used for thickness determination of the coating on the surface of the sheet. However, during long-term use or when processing specific materials, dust, impurities or residues may accumulate at the gas outlet 303, resulting in blocked air flow, affecting the normal operation of the air knife and the processing quality of the sheet. This solution is provided with a cleaning scraping member 20, which is longitudinally slidably arranged on the tool body 3 and has a scraping portion 2001 extending into the gas outlet 303. The design of the cleaning scraping member 20 enables the operator to conveniently slide the scraping portion 2001 inside the gas outlet 303 through manual or automatic control to remove the impurities adhering to the inner wall of the gas outlet 303. The design of the scraping portion 2001 ensures that it can effectively scrape off the deposits without damaging the inner surface of the gas outlet 303 and maintaining its smoothness and smooth air flow. The use of the cleaning scraping member 20 not only simplifies the maintenance process of the air knife, reduces the maintenance cost, but also improves the reliability and service life of the air knife. Especially in a processing environment with high dust or high humidity, regular cleaning of the cleaning scraping member 20 can ensure that the air knife is always in the best working state, avoid processing quality problems caused by blockage of the gas outlet 303, and improve production efficiency and product quality.

[0065] Furthermore, the second rotation driving member 4 and the first lead screw 5 are connected by a universal joint.

[0066] In this embodiment, a universal joint is used for the connection between the first rotation driving member 10 and the rotation transmission shaft 11. The universal joint can allow the two shafts to transmit torque at different angles, and it can compensate for the misalignment of the axes caused by assembly errors, motion deviations or structural deformations, thereby avoiding the resulting additional stress and vibration. This design ensures that the power of the first rotation driving member 10 can be smoothly and efficiently transmitted to the rotation transmission shaft 11, and even if there are slight angular changes during the angle adjustment of the air knife, the continuity and stability of the transmission can be maintained.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An air knife opening and closing transmission device, characterized in that: Used to determine the thickness of the coating on the galvanized sheet surface, including: An outer beam (1), wherein the length direction of the outer beam (1) is defined as a longitudinal direction, and a horizontal direction perpendicular to the length direction of the beam is defined as a transverse direction. An inner beam (2), wherein the inner beam (2) is laterally slidably arranged on the outer beam (1), a knife body (3), wherein the knife body (3) is swingably arranged on the inner beam (2), a second rotation driving member (4), wherein the second rotation driving member (4) is arranged on the outer beam (1), a first screw rod (5), the first screw rod (5) being rotatably arranged on the outer beam (1), with the rotation axis being in a transverse direction, and the output end of the second rotation driving member (4) driving the first screw rod (5) to rotate, A first nut (6), wherein the first nut (6) is arranged on the inner beam (2), and the first nut (6) is threadably matched with the first screw rod (5).

2. The air knife opening and closing transmission device according to claim 1, characterized in that: Also includes: a worm (7), the worm (7) being rotatably disposed on the outer beam (1), and having an axis perpendicular to an axis of the first screw rod (5), A worm wheel (8), wherein the worm wheel (8) is arranged on the first screw rod (5) and meshes with the worm rod (7).

3. The air knife opening and closing transmission device according to claim 2, characterized in that: There are two first screw rods (5), which are rotatably arranged at two ends of the outer beam (1), and the two first screw rods (5) are both connected to the worm wheel (8) and the worm (7), and further include: A transmission rod (9), wherein two ends of the transmission rod (9) are respectively transmission-connected to the two worm gears (7).

4. The air knife opening and closing transmission device according to claim 1, characterized in that: The knife body (3) is swingably disposed at one end of the inner beam (2), the knife body (3) having an arc-shaped rack portion (301), and further comprising: a first rotating driving member (10), wherein the first rotating driving member (10) is arranged on the outer beam (1), and an output end of the first rotating driving member (10) is transmission-connected to the blade body (3) to drive the blade body (3) to swing; A rotating transmission shaft (11), the rotating transmission shaft (11) is rotatably arranged on the inner beam (2) and has a gear portion (1101), the output end of the first rotating drive member (10) is drivingly connected to the rotating transmission shaft (11), and the gear portion (1101) is meshed with the arc-shaped rack portion (301) to enable the rotating transmission shaft (11) to rotate and drive the knife body (3) to rotate.

5. The air knife opening and closing transmission device according to claim 1, characterized in that: One end of the inner beam (2) has an arc-shaped scale groove (201), the arc-shaped scale groove (201) is arranged concentrically with the rotation axis of the knife body (3), the rotation axis of the knife body (3) has an indicating portion (302), and the indicating portion (302) points to the arc-shaped scale groove (201).

6. The air knife opening and closing transmission device according to claim 1, characterized in that: Also includes: A longitudinal baffle slide (12), wherein the longitudinal baffle slide (12) is slidably arranged on the outer beam (1) in the longitudinal direction, a transverse baffle slide (13), wherein the transverse baffle slide (13) is arranged on the longitudinal baffle slide (12) in a transverse and longitudinal sliding manner, a third nut (14), the third nut (14) being arranged on the transverse baffle slide (13), A third screw rod (15), the third screw rod (15) is rotatably disposed on the longitudinal baffle slide (12), and is used to drive the third screw nut (14) to slide horizontally after rotation.

7. The air knife opening and closing transmission device according to claim 6, characterized in that: Also includes: a material guide member (16), the material guide member (16) being longitudinally slidably disposed on the transverse baffle slide (13), baffle member (17), the baffle member (17) moves following the longitudinal baffle slide, the baffle member (17) has a blocking portion for blocking the galvanized sheet, and a material guide space (1701) is formed between two groups of the baffle members (17), a material guide roller (18), the material guide roller (18) being rotatably disposed on the material guide member (16) and being located on one side of the material guide space (1701), A first elastic member (19), wherein one end of the first elastic member (19) is arranged on the material guide member (16), and the other end is arranged on the transverse baffle slide (13), providing a force for the material guide member (16) to slide into the material guide space (1701).

8. The air knife opening and closing transmission device according to claim 7, characterized in that: The blade body (3) has a gas outlet (303), the gas outlet (303) faces the material guiding space (1701), and further comprises: A cleaning scraper (20), the cleaning scraper (20) being longitudinally slidably disposed on the knife body (3), the cleaning scraper (20) comprising a scraping portion (2001), one end of the scraping portion (2001) extending into the gas outlet (303).

9. The air knife opening and closing transmission device according to claim 1, characterized in that: The second rotation driving member (4) and the first screw rod (5) are connected via a universal joint.

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