Ball head locking pin type air knife structure and coating machine

Abstract

The utility model discloses a ball head locking pin type air knife structure and a coating machine. The ball head locking pin type air knife structure comprises a support assembly, an air knife assembly and two ball head locking pins. The support assembly comprises two supporting blocks, and hole channels are formed in the supporting blocks and arranged in the thickness direction of the supporting blocks. The air knife assembly comprises two air knife fixing blocks and an air knife, each air knife fixing block comprises a fixing part and a butt joint part which are connected, the air knife is fixedly connected with the fixing part, the butt joint part laterally protrudes out of the outer end face of the air knife in the length direction of the air knife, and a through hole is formed in the butt joint part and right faces the hole channel; the head portion of the ball head locking pin sequentially penetrates out of the through hole and the hole channel downwards, so that the ball head arranged at the bottom end of the head portion is located below the supporting block, the ball head locking pin comprises a locking state and an unlocking state, in the locking state, the outer wall of the ball head laterally exceeds the hole wall of the hole channel, and in the unlocking state, the ball head retracts into the head portion. And the outer wall of the ball head can avoid the hole wall of the hole channel. The processing cost can be reduced and the assembling convenience can be improved.

Description

Technical Field

[0001] This utility model relates to the field of coating technology, specifically to a ball-head locking pin type air knife structure and a coating machine. Background Technology

[0002] Chinese patent document CN118179881A discloses a quick-release structure for an air knife used in coating equipment. This quick-release structure includes a fixed base assembly and a movable assembly. The fixed base assembly includes a fixed block and a connecting block. The fixed block is adapted to be fixed to the air knife, and the connecting block is adapted to be connected to a coating machine. The fixed block and the connecting block are adjacent to each other and have four corresponding insertion holes. The movable assembly is adapted to be fixed to the air knife and includes a control component, a transmission mechanism, and four insertion parts. The control component and the insertion parts are connected through the transmission mechanism. The control component is used to adjust the position of the insertion parts, switching them between a first position and a second position. In the first position, the four insertion parts are respectively inserted into the four insertion holes to connect and fix the fixed block and the connecting block. In the second position, the four insertion parts are respectively disengaged from the insertion holes to separate the fixed block and the connecting block. This quick-release structure improves the installation structure of the air knife used in coating equipment, greatly enhancing the convenience of air knife assembly and disassembly.

[0003] However, the aforementioned quick-release air knife structure has several drawbacks. First, during the manufacturing process, four insertion holes need to be machined on both the fixing block and the connecting block. This increases the number of processing steps and consequently the manufacturing cost. Furthermore, since the four insertion holes need to be respectively inserted into four connectors, the machining accuracy requirements for the insertion holes will also increase, further increasing the manufacturing cost. Second, during the installation of the air knife, the four connectors need to be aligned with the four insertion holes for assembly, which reduces the ease of assembly.

[0004] In view of the above-mentioned shortcomings, it is necessary to improve the quick-release structure of the air knife. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is that the quick-insertion structure of the air knife in the existing coating equipment will lead to increased processing costs and reduced assembly convenience, so as to provide a ball-head locking pin type air knife structure and coating machine.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] A ball-head locking pin type air knife structure includes a bracket assembly, an air knife assembly, and two ball-head locking pins;

[0008] The support assembly includes two support blocks, and the support blocks have channels that extend along the thickness direction of the support blocks.

[0009] The air knife assembly includes two air knife fixing blocks and an air knife. The air knife fixing block includes a fixed part and a docking part connected together. The air knife is fixedly connected to the fixed part. The docking part protrudes laterally from the outer end face of the air knife along the length direction of the air knife. A through hole is opened on the docking part facing the channel.

[0010] The head of the ball-head locking pin passes downward through the through hole and the channel in sequence, so that the ball head located at the bottom end of the head is below the support block. The ball-head locking pin includes a locked state and an unlocked state. In the locked state, the outer wall of the ball head extends laterally beyond the wall of the channel. In the unlocked state, the ball head retracts inward into the head, so that the outer wall of the ball head can avoid the wall of the channel.

[0011] Furthermore, the bottom surface of the docking part protrudes towards the support block to form a rib, or the bottom surface of the docking part is recessed inward to form a groove, and the top surface of the support block is provided with a groove / rib corresponding to the rib / groove, and the rib and the groove are fitted together.

[0012] Furthermore, the through hole extends through the rib / groove on the mating portion, and the center line of the through hole lies on a plane of symmetry on the rib / groove parallel to its length direction; and / or,

[0013] The channel extends through the groove / rib on the support block, and the center line of the channel is located on the symmetry plane of the groove / rib, parallel to the length direction of the groove / rib.

[0014] Furthermore, it also includes a pressure block, which includes a connecting end and a free end connected together. The connecting end is fixedly connected to the fixing part, and the free end protrudes laterally from the outer end face of the air knife. A through hole is provided on the free end, which is directly opposite to the through hole. The tail of the ball head locking pin is clamped between the mating part and the free end, and the button of the ball head locking pin is located in the through hole.

[0015] Furthermore, the top surface of the free end is recessed inward to form a recessed portion, the recessed portion is arranged around the perforation, and the recessed portion stops at the wall of the perforation.

[0016] Furthermore, the bracket assembly also includes a retainer, which includes a side plate and two opposing limiting blocks. The two limiting blocks are respectively connected to both sides of the side plate. In the width direction of the air knife, the support block is located between the two limiting blocks and connected to the bottom end of the side plate. The two limiting blocks, the support block, and the side plate together form a receiving groove for accommodating the docking portion. The two limiting blocks are located outside the docking portion and are used to limit the docking portion along the width direction of the air knife.

[0017] Furthermore, the bracket assembly also includes a rotating shaft and a bracket plate, and the card holder is rotatably connected to the bracket plate via the rotating shaft.

[0018] Furthermore, the support plate is provided with a dial, and the side plate is provided with a pointer.

[0019] Furthermore, the support plate is provided with a connecting hole / waist hole, and the side plate is provided with a corresponding waist hole / connecting hole. The waist hole and the connecting hole are adapted for fasteners to pass through, so as to restrict the rotation of the side plate relative to the support plate.

[0020] The technical solution of this utility model has the following advantages:

[0021] 1. The ball-head locking pin type air knife structure provided by this utility model has a ball-head locking pin installed on the mating part of the air knife fixing block, which can connect the air knife fixing block and the support block together, realizing the quick assembly and disassembly of the air knife. Specifically, when installing the air knife assembly, press the button of the ball-head locking pin to retract the ball head of the ball-head locking pin. After the ball head of the ball-head locking pin passes through the hole on the support block, release the button, and the ball head is exposed. The outer wall of the ball head extends laterally beyond the hole wall of the hole, thus locking the air knife assembly on the bracket assembly. When disassembling the air knife assembly, press the button of the ball-head locking pin again to retract the ball head of the ball-head locking pin. The ball head avoids the hole wall of the hole. At this time, simply pull up the air knife assembly to remove it from the bracket assembly. In addition, since only one hole structure needs to be opened on the support block and the fixed block to cooperate with the ball head locking pin, the number of holes is reduced, thereby reducing the processing cost. Furthermore, since each end of the air knife structure is equipped with a ball head locking pin, the difficulty of aligning the ball head locking pin with the hole structure can be reduced, thereby improving the convenience of air knife assembly.

[0022] 2. The ball-head locking pin type air knife structure provided by this utility model has a rib protruding from the bottom surface of the docking part towards the support block, or a groove formed by the bottom surface of the docking part being recessed inward. The support block is provided with grooves / ribs corresponding to the ribs / grooves. Since the ribs and grooves fit together, the air knife assembly and the bracket assembly can be quickly positioned, further improving the installation efficiency of the air knife.

[0023] 3. The ball-head locking pin type air knife structure provided by this utility model has a through hole that passes through the protruding rib / groove on the mating part, and the center line of the through hole is located on the symmetrical plane of the protruding rib / groove parallel to the length direction of the protruding rib / groove; and / or, the channel passes through the groove / protruding rib on the support block, and the center line of the channel is located on the symmetrical plane of the groove / protruding rib parallel to the length direction of the groove / protruding rib. In this way, it is convenient to process the air knife fixing block and the support block.

[0024] 4. The ball-head locking pin type air knife structure provided by this utility model has a recessed part formed by the top surface of the free end being recessed inward. The recessed part is arranged around the through hole and stops at the hole wall of the through hole. This recessed part design can provide a larger operating space for the button to be pressed, which is conducive to the complete retraction of the ball head, and thus can ensure that the ball-head locking pin can smoothly enter and exit the channel.

[0025] 5. The ball-head locking pin type air knife structure provided by this utility model includes a rotating shaft and a support plate in the bracket assembly. The card seat is rotatably connected to the support plate through the rotating shaft. In this way, the angle of the air knife assembly can be easily adjusted as needed, that is, the angle of the air knife can be easily adjusted.

[0026] 6. The ball-head locking pin type air knife structure provided by this utility model has a scale on the bracket plate and a pointer on the side plate. In this way, it is possible to quickly confirm whether the angle of the air knife assembly is appropriate, thereby improving the efficiency of the angle adjustment of the air knife assembly.

[0027] 7. The ball-head locking pin type air knife structure provided by this utility model has a connecting hole / waist hole on the bracket plate and a corresponding waist hole / connecting hole on the side plate. The waist hole and connecting hole are suitable for fasteners to pass through, so as to limit the rotation of the side plate relative to the bracket plate, ensure that the air knife assembly is kept at a suitable angle, and the waist hole can meet the adjustment and limiting of the air knife assembly relative to the bracket assembly at multiple rotation angles.

[0028] A coating machine includes the aforementioned ball-head locking pin type air knife structure.

[0029] The technical solution of this utility model has the following advantages:

[0030] The coating machine provided by this utility model has all the advantages of the aforementioned ball-head locking pin type air knife structure. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a three-dimensional schematic diagram of the ball-head locking pin type air knife structure in the embodiment of this utility model;

[0033] Figure 2 This is a front view schematic diagram of the ball-head locking pin type air knife structure in the embodiment of this utility model;

[0034] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0035] Figure 4 This is another perspective view of the ball-head locking pin type air knife structure in the embodiment of this utility model;

[0036] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0037] Figure 6 This is a three-dimensional schematic diagram of the air knife assembly in an embodiment of this utility model;

[0038] Figure 7 This is a three-dimensional schematic diagram of the card holder, support block, and bracket plate in an embodiment of this utility model;

[0039] Figure 8 This is a three-dimensional schematic diagram of the air knife fixing block in an embodiment of this utility model;

[0040] Figure 9 This is another perspective view of the air knife fixing block in an embodiment of this utility model;

[0041] Figure 10 This is a front view of the ball head locking pin in an embodiment of this utility model;

[0042] Figure 11 This is a three-dimensional schematic diagram of the bracket assembly, air knife fixing block, pressure block, and ball head locking pin in the embodiment of this utility model.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Bracket assembly; 11. Support block; 111. Channel; 112. Groove; 12. Card seat; 121. Side plate; 1211. Waist hole; 1212. Pointer; 122. Limiting block; 13. Bracket plate; 131. Dial; 132. Connecting hole; 14. Rotating shaft; 2. Air knife assembly; 21. Air knife fixing block; 211. Fixing part; 212. Connecting part; 2121. Through hole; 2122. Protruding rib; 22. Air knife; 23. Pressure block; 231. Connecting end; 232. Free end; 2321. Through hole; 2322. Recess; 3. Ball head locking pin; 31. Button; 32. Tail; 321. First column; 322. Second column; 33. Head; 331. Ball head; A. Receiving groove. Detailed Implementation

[0045] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0046] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0049] Example 1

[0050] like Figures 1 to 11 This embodiment provides a ball-head locking pin type air knife structure, including a bracket assembly 1, an air knife assembly 2, and two ball-head locking pins 3. The bracket assembly 1 includes two support blocks 11, and the support blocks 11 are provided with channels 111 (e.g., ...). Figure 7 As shown), the channel 111 extends along the thickness direction of the support block 11. The air knife assembly 2 includes two air knife fixing blocks 21 and an air knife 22. The air knife fixing block 21 includes a fixed part 211 and a docking part 212 connected together. The air knife 22 is fixedly connected to the fixed part 211. The docking part 212 protrudes laterally from the outer end face of the air knife 22 along the length direction of the air knife 22. A through hole 2121 is opened on the docking part 212 opposite to the channel 111 (e.g., Figure 8 and Figure 9As shown), the head 33 of the ball head locking pin 3 (as shown) Figure 3 and Figure 10 As shown) it passes downwards through the through hole 2121 and the channel 111, so that the ball head 331 (as shown) located at the bottom end of the head 33 passes through the through hole 2121 and the channel 111 in sequence, so that the ball head 331 located at the bottom end of the head 33 passes through the channel 2121 and the channel 111 in sequence. Figure 3 and Figure 10 As shown, located below the support block 11, the ball head locking pin 3 has a locked state and an unlocked state. In the locked state, the outer wall of the ball head 331 extends laterally beyond the hole wall of the channel 111. In the unlocked state, the ball head 331 retracts inward to the head 33, so that the outer wall of the ball head 331 can avoid the hole wall of the channel 111.

[0051] In this embodiment, the ball-head locking pin 3 installed on the air knife fixing block 21 can connect the air knife fixing block 21 to the support block 11, realizing the quick assembly and disassembly of the air knife 22. Specifically, when installing the air knife assembly 2, press the button 31 of the ball-head locking pin 3 to retract the ball head 331 on the head 33 of the ball-head locking pin 3. After the head 33 of the ball-head locking pin 3 passes through the hole 111 on the support block 11, release the button 31. The ball head 331 is exposed, and its outer wall extends laterally beyond the hole wall of the channel 111, thus locking the air knife assembly 2 on the bracket assembly 1. When disassembling the air knife assembly 2, press the button 31 of the ball head locking pin 3 again, causing the ball head 331 on the head 33 of the ball head locking pin 3 to retract into the head 33, and the outer wall of the ball head 331 to avoid the hole wall of the channel 111. At this time, simply pull up the air knife assembly 2 to remove it from the bracket assembly 1. In addition, since only one hole structure needs to be opened on the support block 11 and the fixing block 21 respectively to cooperate with the ball head locking pin, the number of holes is reduced, thereby reducing the processing cost. Furthermore, since each end of the air knife structure is equipped with a ball head locking pin 3, the difficulty of inserting and aligning the ball head locking pin 3 with the hole structure can be reduced, thereby improving the convenience of air knife assembly.

[0052] It should be noted that ball head locking pin 3 is a standard part. For ease of understanding, a brief introduction to ball head locking pin 3 is provided below:

[0053] The ball-head locking pin 3 includes a button 31, a tail 32, and a head 33. The button 31 protrudes from the top surface of the tail 32. The tail 32 includes a first post 321 and a second post 322. The ball head 331 is located at the bottom end of the head 33. When the button 31 is pressed, the ball head 331 retracts into the head 33. When the button 31 is released, the ball head 331 automatically pops out. The internal structure and working principle of the ball-head locking pin 3 are existing technologies and will not be described in detail here.

[0054] In this embodiment, the air knife fixing block 21 is generally L-shaped, and the bottom surface of the docking part 212 protrudes towards the support block 11 to form a rib 2122 (e.g., Figure 8 and Figure 9As shown), a groove 112 is provided on the top surface of the support block 11 corresponding to the protruding rib 2122 (as shown). Figure 7 As shown, the rib 2122 engages with the groove 112, and both the rib 2122 and the groove 112 extend along the length of the air knife 22. Alternatively, the bottom surface of the mating portion 212 can be recessed inward to form the groove 112, and correspondingly, the top surface of the support block 11 protrudes towards the mating portion 212 to form the rib 2122. Preferably, the cross-section of the rib 2122 on the bottom surface of the mating portion 212 is V-shaped, and the cross-section of the groove 112 on the support block 11 is also V-shaped. This cross-sectional shape of the rib 2122 and the groove 112 facilitates rapid engagement between the mating portion 212 and the support block 11. Of course, the cross-sectional shape of the rib 2122 and the groove 112 can also be semi-circular or rectangular. By engaging the rib 2122 with the groove 112, rapid positioning of the air knife assembly 2 and the bracket assembly 1 can be achieved, further improving the installation efficiency of the air knife assembly 2.

[0055] Furthermore, the through hole 2121 penetrates the protruding rib 2122 on the mating portion 212, and the center line of the through hole 2121 is located on the symmetry plane of the protruding rib 2122 (this symmetry plane is a plane on the protruding rib 2122 that is parallel to its own length direction); and / or, the channel 111 penetrates the groove 112 on the support block 11, and the center line of the channel 111 is located on the symmetry plane of the groove 112 (this symmetry plane is a plane on the groove 112 that is parallel to its own length direction). On the surface of the air knife fixing block 21, it is convenient to process the air knife fixing block 21 and / or to process the support block 11. Specifically, through holes 2121 can be processed on the processing path of the protruding rib 2122, and holes 111 can be processed on the processing path of the groove 112, without having to move the air knife fixing block 21 along the length direction perpendicular to the protruding rib 2122 to process through holes 2121, and without having to move the support block 11 along the direction perpendicular to the groove 112 to process holes 111. Similarly, when a groove 112 is provided on the mating part 212, and the center line of the through hole 2121 coincides with the symmetry plane of the groove 112 (this symmetry plane is the plane on the groove 112 that is parallel to the length direction of the groove 112 itself), and / or when a rib 2122 is provided on the support block 11, and the center line of the channel 111 coincides with the symmetry plane of the rib 2122 (this symmetry plane is the plane on the rib 2122 that is parallel to the length direction of the rib 2122 itself), it is also convenient to process the air knife fixing block 21, and / or to process the support block 11.

[0056] Furthermore, it also includes a pressure block 23, which is L-shaped in general. The pressure block 23 includes a connecting end 231 and a free end 232. The connecting end 231 is fixedly connected to the fixing part 211, and the free end 232 protrudes laterally from the outer end face of the air knife 22. A through hole 2321 is provided on the free end 232, which is directly opposite to the through hole 2121. The tail 32 of the ball head locking pin 3 is clamped between the mating part 212 and the free end 232, and the button 31 of the ball head locking pin 3 is located in the through hole 2321. In this embodiment, the pressure block 23 can be used in conjunction with the air knife fixing block 21 to easily fix the ball head locking pin 3 without machining an external thread on the outer wall of the ball head locking pin 3 to connect with the air knife fixing block 21.

[0057] Furthermore, the top surface of the free end 232 is recessed inward to form a recessed portion 2322 (e.g., Figure 5 As shown, the recess 2322 is provided around the through hole 2321, and the recess 2322 stops at the hole wall of the through hole 2321. This recess 2322 design provides a larger operating space for the button 31 to be pressed, which is conducive to the complete retraction of the ball head 331, and thus ensures that the ball head locking pin 3 can smoothly enter and exit the channel 111.

[0058] Furthermore, such as Figure 7 As shown, the bracket assembly 1 also includes a retainer 12, which includes a side plate 121 and two opposing limiting blocks 122. The two limiting blocks 122 are respectively connected to the two sides of the side plate 121. A support block 11 is located between the two limiting blocks 122 and connected to the bottom end of the side plate 121. The two limiting blocks 122, the support block 11, and the side plate 121 form a receiving groove A, which is used to receive the docking part 212. The two limiting blocks 122 are located outside the docking part 212 and are used to accommodate the air knife 22 along its width direction (e.g., ...). Figure 6 (In the direction indicated by the middle arrow) Limiting docking part 212.

[0059] Furthermore, the support assembly 1 also includes a rotating shaft 14 and a support plate 13. The mounting bracket 12 is rotatably connected to the support plate 13 via the rotating shaft 14. In this way, the angle of the air knife assembly 2 can be adjusted as needed, that is, the angle of the air knife 22 can be easily adjusted. Figure 7 As shown, in this embodiment, the two extreme angles of rotation of the card holder 12 relative to the support plate 13 are -45° and +45°. The positive and negative signs here are only to indicate two opposite directions. Of course, the extreme angles of rotation of the card holder 12 relative to the support plate 13 can also be set to other angles as needed, and are not specifically limited here.

[0060] Furthermore, the support plate 13 is provided with a dial 131 and the side plate 121 is provided with a pointer 1212. In this way, it is possible to quickly confirm whether the angle of the air knife assembly 2 is appropriate and improve the efficiency of the angle adjustment of the air knife assembly 2.

[0061] In this embodiment, a connecting hole 132 is provided on the support plate 13, and a corresponding waist hole 1211 is provided on the side plate 121. The waist hole 1211 and the connecting hole 132 are adapted to allow fasteners (not shown) to pass through, thereby restricting the rotation of the side plate 121 relative to the support plate 13, ensuring that the air knife assembly 2 is maintained at a suitable angle, and the waist hole 1211 can meet the adjustment and limiting of multiple rotation angles of the air knife assembly 2 relative to the support assembly 1. Of course, a connecting hole 132 can also be provided on the side plate 121, and a corresponding waist hole 1211 can be provided on the support plate 13.

[0062] Example 2

[0063] This embodiment provides a coating machine, including the ball-head locking pin type air knife structure of embodiment 1 (such as...). Figures 1 to 11 As shown, the support plate 13 of the ball-head locking pin type air knife structure is fixedly connected to the gantry of the coating machine. The other parts of the coating machine are existing technologies and will not be described in detail here.

[0064] The coating machine provided in this embodiment has all the advantages of the ball-head locking pin type air knife structure in the embodiment.

[0065] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A ball-head locking pin type air knife structure, characterized in that, Includes a bracket assembly (1), an air knife assembly (2), and two ball-head locking pins (3); The support assembly (1) includes two support blocks (11), and the support blocks (11) are provided with channels (111) that extend along the thickness direction of the support blocks (11). The air knife assembly (2) includes two air knife fixing blocks (21) and an air knife (22). The air knife fixing block (21) includes a fixed part (211) and a docking part (212) connected together. The air knife (22) is fixedly connected to the fixed part (211). The docking part (212) protrudes laterally from the outer end face of the air knife (22) along the length direction of the air knife (22). A through hole (2121) is provided on the docking part (212) facing the channel (111). The head (33) of the ball head locking pin (3) passes downward through the through hole (2121) and the channel (111) in sequence, so that the ball head (331) located at the bottom end of the head (33) is below the support block (11). The ball head locking pin (3) includes a locked state and an unlocked state. In the locked state, the outer wall of the ball head (331) extends laterally beyond the hole wall of the channel (111). In the unlocked state, the ball head (331) retracts inward into the head (33), so that the outer wall of the ball head (331) can avoid the hole wall of the channel (111).

2. The ball-head locking pin type air knife structure according to claim 1, characterized in that, The bottom surface of the docking part (212) protrudes towards the support block (11) to form a rib (2122), or the bottom surface of the docking part (212) is recessed inward to form a groove (112). The top surface of the support block (11) is provided with a groove (112) / rib (2122) corresponding to the rib (2122) / groove (112), and the rib (2122) and the groove (112) are fitted together.

3. The ball-head locking pin type air knife structure according to claim 2, characterized in that, The through hole (2121) penetrates the rib (2122) / groove (112) on the mating part (212), and the center line of the through hole (2121) is located on the symmetry plane of the rib (2122) / groove (112) parallel to the length direction of the rib (2122) / groove (112); and / or, The channel (111) passes through the groove (112) / rib (2122) on the support block (11), and the center line of the channel (111) is located on the symmetry plane of the groove (112) / rib (2122) parallel to the length direction of the groove (112) / rib (2122).

4. The ball-head locking pin type air knife structure according to claim 1, characterized in that, It also includes a pressure block (23), which includes a connecting end (231) and a free end (232). The connecting end (231) is fixedly connected to the fixing part (211). The free end (232) protrudes laterally from the outer end face of the air knife (22). The free end (232) has a through hole (2321) that is directly opposite to the through hole (2121). The tail (32) of the ball head locking pin (3) is sandwiched between the docking part (212) and the free end (232). The button (31) of the ball head locking pin (3) is located in the through hole (2321).

5. The ball-head locking pin type air knife structure according to claim 4, characterized in that, The top surface of the free end (232) is recessed inward to form a recess (2322), the recess (2322) is arranged around the perforation (2321), and the recess (2322) ends at the wall of the perforation (2321).

6. The ball-head locking pin type air knife structure according to any one of claims 1-5, characterized in that, The bracket assembly (1) further includes a card holder (12), which includes a side plate (121) and two opposing limiting blocks (122). The two limiting blocks (122) are respectively connected to the two sides of the side plate (121). In the width direction of the air knife (22), the support block (11) is located between the two limiting blocks (122) and connected to the bottom end of the side plate (121). The two limiting blocks (122), the support block (11), and the side plate (121) enclose a receiving groove (A). The receiving groove (A) is used to receive the docking part (212). The two limiting blocks (122) are located outside the docking part (212) and are used to limit the docking part (212) along the width direction of the air knife (22).

7. The ball-head locking pin type air knife structure according to claim 6, characterized in that, The bracket assembly (1) further includes a rotating shaft (14) and a bracket plate (13), and the card holder (12) is rotatably connected to the bracket plate (13) through the rotating shaft (14).

8. The ball-head locking pin type air knife structure according to claim 7, characterized in that, The support plate (13) is provided with a dial (131), and the side plate (121) is provided with a pointer (1212).

9. The ball-head locking pin type air knife structure according to claim 7, characterized in that, The support plate (13) is provided with a connecting hole (132) / waist hole (1211), and the side plate (121) is provided with a corresponding waist hole (1211) / connecting hole (132). The waist hole (1211) and the connecting hole (132) are adapted to allow fasteners to pass through, so as to restrict the rotation of the side plate (121) relative to the support plate (13).

10. A coating machine, characterized in that, The structure includes the ball-head locking pin type air knife structure as described in any one of claims 1-9.

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