CN218238303U - Air knife and drying device - Google Patents

Abstract

The application belongs to the technical field of drying devices, and particularly relates to an air knife and a drying device. The air knife comprises a main pipe and a plurality of knife mouths, wherein the main pipe is provided with an air inlet; a plurality of sword mouths are arranged on the outer peripheral face of the main body pipe side by side along the axial direction of the main body pipe, each sword mouth is detachably connected with the main body pipe, each sword mouth coats the side wall on one side of the main body pipe and is communicated with the main body pipe, and an air outlet is formed in each sword mouth. When a new type of PCB needs to be dried, only the knife nozzles on the main body pipe need to be replaced by the knife nozzles matched with the PCB, the whole air knife does not need to be redesigned and manufactured, only the corresponding knife nozzles need to be opened, and the processing cost of the PCB is reduced.

Description

Air knife and drying device

Technical Field

The application belongs to the technical field of drying devices, and particularly relates to an air knife and a drying device.

Background

In the process of processing a workpiece, taking a Printed Circuit Board (PCB) as an example, the PCB needs to be subjected to liquid medicine treatment and water washing, and the liquid medicine treatment and the washed PCB need to be dried. During the drying process, a high-speed air flow is provided by the fan and ejected by the air knife. When the PCB passes through the air knife under the driving of the conveying mechanism, residual liquid medicine and dirt on the PCB can be removed by air sprayed from the air knife.

At present, the air knife comprises an air inlet and a plurality of air outlets respectively communicated with the air inlet, and when the air inlet is filled with air, the air can flow out of each air outlet of the air knife. However, when a new type of PCB needs to be dried, the air knife matched with the PCB needs to be redesigned to meet the air blowing requirement of the PCB, which increases the processing cost of the PCB.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of this application is to provide an air knife and drying device, when the PCB panel of new type need carry out the drying, will redesign make with this PCB assorted air knife to adapt to this PCB's the demand of blowing, increased PCB's processing cost's problem.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in one aspect, there is provided an air knife comprising:

the main pipe is provided with an air inlet; and

the plurality of knife mouths are arranged on the outer peripheral surface of the main body pipe side by side along the axial direction of the main body pipe, each knife mouth is detachably connected with the main body pipe, each knife mouth covers the side wall on one side of the main body pipe and is communicated with the main body pipe, and an air outlet is formed in each knife mouth.

In one embodiment, the air knife further comprises a plurality of connecting pieces and a plurality of fastening assemblies, the connecting pieces are arranged at intervals along the axial direction of the main body pipe, each connecting piece covers one side of the outer peripheral surface of the main body pipe, and two ends of each connecting piece are locked on the corresponding knife mouth through the fastening assemblies respectively.

In one embodiment, two sides of the knife tip are respectively provided with a connecting part, the two connecting parts of the knife tip cover the other side of the outer peripheral surface of the main pipe, and two ends of the connecting piece are respectively locked on the two connecting parts of the knife tip through fastening components.

In one embodiment, the air knife further comprises a support plate clamped between the end portion of the connecting member and the connecting portion, and the fastening assembly is used for locking the end portion of the connecting member, the support plate and the connecting portion.

In one embodiment, the cross-sectional area of each air outlet is gradually reduced along the air outlet direction.

In one embodiment, each cutter nozzle is provided with a plurality of air outlets, the air outlets on each cutter nozzle are distributed in a plurality of rows in the direction parallel to the axial direction of the main tube, and the air outlets in two adjacent rows are staggered in the direction perpendicular to the axial direction of the main tube.

In one embodiment, the main tube is provided with a plurality of positioning holes, and one side of each knife nozzle facing the main tube is provided with a protrusion in an outward protruding manner, and each protrusion extends into the corresponding positioning hole.

In one embodiment, the main tube comprises a tube body and two blocking units for respectively blocking two ends of the tube body, the blocking units comprise an end cover and a locking member, the end cover and the locking member are arranged at the end part of the tube body in a covering mode, the locking member penetrates through the end cover and the end part of the tube body respectively, and the plurality of knife mouths are arranged on the outer peripheral surface of the tube body side by side and are communicated with the tube body.

In one embodiment, two opposite sides of each knife edge are respectively provided with a limiting part, and one end of each limiting part, which is far away from the main pipe, extends to one end of each knife edge, which is far away from the main pipe.

On the other hand, provide a drying device, including fan, transport mechanism and the air knife that any above-mentioned embodiment provided, transport mechanism is used for driving and treats the motion of dry work piece, and the air knife is installed in the position just to transport mechanism, and the fan communicates with the air intake of main part pipe.

The air knife and the drying device provided by any of the above embodiments of the present application have at least the following beneficial effects: this air knife sets up the air intake on the main part pipe, and a plurality of sword mouths are arranged side by side on the outer peripheral face of main part pipe along the axial of main part pipe, and each sword mouth all coats one side lateral wall of main part pipe and communicates with the main part pipe respectively to every sword mouth all can dismantle with the main part pipe and be connected. When a new type of PCB needs to be dried, only the knife nozzles on the main body pipe need to be replaced by the knife nozzles matched with the PCB, the whole air knife does not need to be redesigned and manufactured, only the corresponding knife nozzles need to be opened, and the processing cost of the PCB is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or exemplary technical descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an air knife provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a side of an air knife facing a workpiece to be dried according to an embodiment of the present disclosure;

FIG. 3 is a partial cross-sectional view of a main tube provided in accordance with an embodiment of the present application;

FIG. 4 is a first schematic structural diagram of a knife tip according to an embodiment of the present disclosure;

fig. 5 is a second schematic structural view of a knife tip according to an embodiment of the present application;

FIG. 6 is a cross-sectional view of an air knife provided in accordance with an embodiment of the present application;

fig. 7 is a partially enlarged schematic view of a portion a of fig. 6.

Wherein, in the drawings, the reference numerals are mainly as follows:

1. a main body tube; 11. an air inlet; 12. positioning holes; 13. a through hole; 14. a pipe body; 15. an end cap;

2. a knife mouth; 21. an air outlet; 22. a connecting portion; 23. a protrusion; 24. a limiting part;

3. a connecting member;

4. a support plate;

5. and (4) a joint.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first", "second", "third", "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third", "fourth" may explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present application, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As described in the background art, in the prior art, when a new type of PCB board needs to be dried, an air knife matched with the PCB needs to be redesigned and manufactured to meet the air blowing requirement of the PCB, thereby increasing the processing cost of the PCB.

In order to solve the above problems, an embodiment of the present invention provides an air knife, please refer to fig. 1 to 3, the air knife includes a main tube 1 and a plurality of knife nozzles 2, and an air inlet 11 is formed in the main tube 1. A plurality of sword mouth 2 are arranged side by side on the outer peripheral face of main part pipe 1 along the axial of main part pipe 1, and each sword mouth 2 all can dismantle with main part pipe 1 and be connected, and each sword mouth 2 all coats the lateral wall of main part pipe 1 one side and communicates with main part pipe 1, has all seted up air outlet 21 on each sword mouth 2.

In this application embodiment, when the PCB of new type need carry out the drying, only need with each sword mouth 2 on the main part pipe 1 change into with this PCB assorted sword mouth 2, the air knife is whole need not redesign and manufacturing, only needs the corresponding sword mouth 2 of die sinking, has reduced PCB's processing cost.

The knife edge 2 can be an injection molding part and is formed by injection molding, so that the knife edge 2 is convenient to modularize, different knife edges 2 can be spliced on the main pipe 1 according to different blowing requirements of PCBs, the air knife is matched with the PCB to be dried, and the universality of the air knife is improved. Present air knife forms through the sheet metal welding, and its production process is comparatively troublesome, and the cost of labor is higher, and corresponding hole site is seted up to the air knife that this embodiment provided on main part pipe 1, with suitable sword mouth 2 splice to main part pipe 1 on can, the production process is comparatively easy, has reduced the cost of labor.

In addition, by setting the length of the main body tube 1, the length of the air knife can be matched with the size of the PCB to be dried by installing a proper number of knife nozzles 2 on the main body tube 1.

The metal pipe can be used as the main body pipe 1, the two ends of the main body pipe 1 are sealed, and the length of the main body pipe 1 can be set according to the size of the drying device and the PCB. The number of the knife tips 2 on the main tube 1 is not limited, and those skilled in the art can set the number according to the length of the main tube 1 and the size of each knife tip 2, which is not limited herein. The air inlet 11 may be formed in the middle of the side wall of the main tube 1 away from the tool tip 2, and for example, the air inlet 11 may be cut in the main tube 1 by a laser tube cutting machine. It can be understood that the main pipe 1 can be provided with a connector 5 at the position of the air inlet 11, the connector 5 is communicated with the air inlet 11, one end of an air inlet pipeline is connected through the connector 5, and the other end of the air inlet pipeline is connected with a fan. A plurality of through holes 13 may be formed in a side wall of the main tube 1 facing the knife tip 2, the through holes 13 are arranged side by side along an axial direction of the main tube 1, and each knife tip 2 corresponds to at least one through hole 13, so as to communicate each knife tip 2 with the main tube 1. By setting the size of the space between the adjacent through holes 13, for example, the space between two adjacent through holes 13 close to the air inlet 11 is larger, and the space between two adjacent through holes 13 far away from the air inlet 11 is smaller, the main body tube 1 can uniformly distribute the introduced air to each of the knife tips 2.

Schematically, a filtering mechanism can be arranged between the fan and the air inlet pipeline, air entering the air knife is filtered through the filtering mechanism, and impurities in the air are prevented from being attached to the surface of the PCB. A heating mechanism can be arranged between the fan and the air inlet pipeline, and air entering the air knife is heated through the heating mechanism, so that hot air is sprayed out of the air outlet 21 of the air knife, and the drying effect of the air knife on the PCB is improved.

In an embodiment, referring to fig. 1-2, as a specific implementation manner of the air knife provided by the embodiment of the present application, the air knife further includes a plurality of connecting members 3 and a plurality of fastening assemblies (not shown), the plurality of connecting members 3 are arranged at intervals along an axial direction of the main tube 1, each connecting member 3 covers one side of an outer circumferential surface of the main tube 1, and two ends of each connecting member 3 are locked to the corresponding knife tip 2 through the fastening assemblies respectively.

Fig. 2 shows that each connecting piece 3 forms an arc-shaped strip-shaped structure, and each knife nozzle 2 can be fixed with the main pipe 1 through a plurality of connecting pieces 3. The skilled person can set the specific number of the connecting members 3 according to actual needs, and the number is not limited herein. The number of the fastening components is twice that of the connecting pieces 3, and each connecting piece 3 can be coated on one side of the peripheral surface of the main tube 1, which is far away from the PCB.

In a possible implementation manner, the fastening assembly includes a bolt, and after each connecting piece 3 is coated on the outer peripheral surface of the main tube 1, the bolt can be used to penetrate through the end part of the connecting piece 3 and be locked on the tool bit 2.

In this embodiment, the tool bit 2 is mounted on the main body tube 1 through the connecting member 3 and the fastening member, so that the reliability of connection between each tool bit 2 and the main body tube 1 can be ensured, and the air knife can be easily assembled. Meanwhile, a structure for installing the cutter nozzle 2 is not required to be arranged on the main body pipe 1, the main body pipe 1 is convenient to process, and the production efficiency of the air knife is improved.

In other embodiments, a connecting seat may be provided on the main tube 1, and a bolt may be used to pass through the connecting seat and lock on the tool bit 2. Or, each knife edge 2 also can be connected with main part pipe 1 through the mode of block, and is specific, and each knife edge 2 all is provided with the trip towards one side of main part pipe 1, offers the draw-in hole with trip cooperation block on main part pipe 1, does not only limit here.

In a specific embodiment, referring to fig. 4-6, as a specific implementation manner of the air knife provided by the embodiment of the present application, two sides of the knife tip 2 are respectively provided with a connecting portion 22, two connecting portions 22 of the knife tip 2 cover the other side of the outer circumferential surface of the main tube 1, and two ends of the connecting member 3 are respectively locked on two connecting portions 22 of the knife tip 2 by fastening assemblies.

Wherein, each knife mouth 2 is provided with an air inlet cavity, the air inlet cavity is arranged right opposite to the through hole 13 on the main body pipe 1, and each connecting part 22 can be an arc-shaped sheet structure arranged on the side surface of the air inlet cavity. The fastening assembly comprises a bolt and a nut matched with the bolt, the tool bit 2 can respectively penetrate through the end part of the connecting piece 3 and one end of the connecting part 22 far away from the air inlet cavity by using the bolt in the assembling process, and the nut is arranged on the bolt so as to clamp the end part of the connecting piece 3 and the end part of the connecting part 22 between the head part of the bolt and the nut.

In this embodiment, the two ends of the connecting member 3 are locked to the two connecting portions 22 of the knife tip 2 by the fastening members, so as to facilitate the installation of the knife tips 2, and meanwhile, when the fastening members lock the connecting portions 22 to the connecting member 3, the connecting portions 22 of the knife tips 2 can be tightly attached to the outer peripheral surface of the main body pipe 1, so that the air tightness between the knife tips 2 and the main body pipe 1 is improved, and the air is not easy to overflow from the space between the knife tips 2 and the main body pipe 1.

In a more specific embodiment, referring to fig. 1, fig. 2 and fig. 6, as a specific implementation of the air knife provided by the embodiment of the present application, the air knife further includes a supporting plate 4, the supporting plate 4 is clamped between the end of the connecting member 3 and the connecting portion 22, and the fastening assembly is used for locking the end of the connecting member 3, the supporting plate 4 and the connecting portion 22. Illustratively, the support plate 4 is assembled by placing a bolt of a fastening assembly through the end of the attachment member 3, the support plate 4, and the end of the support member in that order, and mounting a nut on the bolt to clamp the end of the attachment member 3, the support plate 4, and the end of the support member between the head of the bolt and the nut.

Fig. 2 and 6 show that the main tube 1 is provided with support plates 4 on both sides. Wherein, the number of the support plates 4 may be plural, so that the total length of the plural support plates 4 can be matched with the length of the main body pipe 1 by adjusting the number of the support plates 4.

It can be understood that when the air knife is used for being hot-blast to PCB spun, drying device is provided with the baffle that glass or stainless steel material made, and the baffle is just to drying device's transport mechanism setting, and when air knife spun is hot-blastly when by PCB bounce-back, the baffle can play the effect that blocks to the hot-blast of bounce-back, and then reduces thermal loss. In this embodiment, can play the effect of support to the baffle through setting up backup pad 4, the tip lid of baffle is established on backup pad 4 promptly, the fixed of baffle of being convenient for.

In an embodiment, referring to fig. 6 and fig. 7, as a specific implementation manner of the air knife provided in the embodiment of the present application, the cross-sectional area of each air outlet 21 gradually decreases along the air outlet direction, that is, the air outlet 21 of the knife tip 2 is disposed in a tapered and inclined manner. The cross section of the air outlet 21 may be a long round hole with the length direction parallel to the axial direction of the main body pipe 1. Through the above arrangement, when the air flows out from each air outlet 21 of the knife nozzle 2, the air outlet 21 can increase the flow rate and pressure of the air, and the water dispelling and drying effects of the air knife on the PCB are improved.

In a specific embodiment, referring to fig. 2 and fig. 4, as a specific implementation manner of the air knife provided by the embodiment of the present application, each of the knife nozzles 2 is provided with a plurality of air outlets 21, the air outlets 21 on each knife nozzle 2 are distributed in a plurality of rows in a direction parallel to the axial direction of the main tube 1, and the air outlets 21 in two adjacent rows are staggered in a direction perpendicular to the axial direction of the main tube 1. It is worth mentioning that, drying device is when carrying out the drying to PCB, is driven PCB by transport mechanism and passes through the air knife along the axial direction of perpendicular to main part pipe 1. Above-mentioned setting can improve from air knife spun air current to PCB's coverage, guarantees that the air knife catches up with water and weathers the effect to PCB. Correspondingly, each knife edge 2 is obliquely arranged along two axial side surfaces of the main body pipe 1, the oblique angle is matched with the staggered angle of the two adjacent rows of air outlets 21, and a blind area formed between the two adjacent knife edge 2 when the PCB passes through the air knife is avoided.

In an embodiment, referring to fig. 3, fig. 4 and fig. 6, as a specific implementation manner of the air knife provided by the embodiment of the present application, the main tube 1 is provided with a plurality of positioning holes 12, a protrusion 23 is convexly provided on a side of each knife tip 2 facing the main tube 1, and each protrusion 23 extends into the corresponding positioning hole 12. Illustratively, the positioning hole 12 may be a waist-shaped hole extending along the circumferential direction of the main body tube 1, and each of the two protrusions 23 may be disposed on each of the two tool bits 2, and in the assembling process of the tool bit 2, the two protrusions 23 all extend into the waist-shaped hole and respectively abut against two ends of the waist-shaped hole.

Through the arrangement, the mutual positioning between the knife nozzle 2 and the main body pipe 1 can be realized through the bulge 23 and the positioning hole 12, the movement of the knife nozzle 2 relative to the main body pipe 1 is avoided, and the alignment precision and efficiency between the knife nozzle 2 and the main body pipe 1 are improved.

In an embodiment, referring to fig. 1, 2 and 6, as a specific implementation of the air knife provided by the embodiment of the present application, the main tube 1 includes a tube body 14 and two blocking units for respectively blocking two ends of the tube body 14, each of the blocking units includes an end cap 15 and a locking member (not shown) which are respectively disposed through the end cap 15 and the end of the tube body 14, the locking members are respectively disposed through the end cap 15 and the end of the tube body 14, and the plurality of blades 2 are disposed side by side on the outer circumferential surface of the tube body 14 and are communicated with the tube body 14. Wherein, can use the tubular metal resonator as body 14, end cover 15 can be the injection molding, and it includes the diapire and encircles the side wall that the diapire set up, can use the bolt as the retaining member, and after end cover 15 lid was established at the tip of body 14, use the bolt to pass the side wall and the body 14 setting of end cover 15 respectively, avoid end cover 15 to drop from the tip of body 14. It will be appreciated that each of the tips 2 is mounted on the tube 14 and communicates with the tube 14, respectively. Above-mentioned setting can use the laser pipe cutting machine to process body 14, through setting up the both ends shutoff of shutoff unit with body 14, avoids spilling over from the both ends of letting in the air in body 14 from body 14.

In an embodiment, referring to fig. 1, fig. 5 and fig. 6, as a specific implementation manner of the air knife provided by the embodiment of the present application, two opposite sides of each knife tip 2 are respectively provided with a limiting portion 24, and specifically, two opposite sides of each knife tip 2 along a PCB moving direction are respectively provided with a limiting portion 24. One end of the limiting part 24 far away from the main body pipe 1 extends to one end of the knife nozzle 2 far away from the main body pipe 1. The position-limiting portion 24 may be formed as a sheet structure, which may be formed as a single piece with the tool tip 2 through a one-step molding process. Illustratively, a plurality of limiting parts 24 may be respectively disposed on both sides of the tool tip 2, and the plurality of limiting parts 24 are disposed at intervals along the axial direction of the main body tube 1.

When using the gyro wheel that a plurality of parallel intervals set up as drying device's transport mechanism, transport mechanism if drive when thinner PCB passes through the air knife, under the wind-force effect of air knife, PCB takes place the upset easily and blocks between two adjacent gyro wheels. In this embodiment, can play spacing effect to the PCB of process through setting up spacing portion 24, thereby spacing portion 24 can carry on spacingly to this PCB by this PCB of butt when PCB takes place to overturn, card when avoiding PCB to pass through the air knife between two adjacent gyro wheels.

The embodiment of the application also provides a drying device, which comprises a fan, a conveying mechanism and the air knife provided by any one of the embodiments. The conveying mechanism is used for driving the workpiece to be dried to move, wherein the workpiece to be dried can be a PCB or a glass plate and other plate-shaped pieces, the air knife is arranged at the position right facing the conveying mechanism, and the fan is communicated with the air inlet 11 of the main pipe 1. This structure adopts the drying device of above-mentioned air knife, treats the dry work piece when needs are to the slabby of different grade type and dry, only needs to change each sword mouth 2 on the main part pipe 1 into with this treat dry work piece assorted sword mouth 2, and the air knife wholly need not redesign and manufacturing, and drying device's cost is lower.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims (10)

1. Air knife, its characterized in that includes:

the main pipe is provided with an air inlet; and

the plurality of knife mouths are arranged on the outer peripheral surface of the main body pipe side by side along the axial direction of the main body pipe, each knife mouth is detachably connected with the main body pipe, each knife mouth covers the side wall of one side of the main body pipe and is communicated with the main body pipe, and an air outlet is formed in each knife mouth.

2. The air knife according to claim 1, further comprising a plurality of connectors and a plurality of fastening assemblies, wherein the connectors are arranged at intervals along the axial direction of the main tube, each connector covers one side of the outer circumferential surface of the main tube, and two ends of each connector are locked to the corresponding knife mouths through the fastening assemblies.

3. The air knife according to claim 2, wherein two sides of the knife mouth are respectively provided with a connecting part, the two connecting parts of the knife mouth cover the other side of the outer circumferential surface of the main tube, and two ends of the connecting part are respectively locked on the two connecting parts of the knife mouth through the fastening components.

4. The air knife of claim 3 further comprising a support plate clamped between the end of the connector and the connector, the fastening assembly for locking the end of the connector, the support plate and the connector.

5. The air knife according to any one of claims 1-4, wherein the cross-sectional area of each air outlet is gradually reduced along the air outlet direction.

6. The air knife of claim 5, wherein each of the blades has a plurality of air outlets, the air outlets of each blade are arranged in a plurality of rows in a direction parallel to the axial direction of the main tube, and the air outlets of two adjacent rows are staggered in a direction perpendicular to the axial direction of the main tube.

7. The air knife according to any one of claims 1-4, wherein the main tube has a plurality of positioning holes, each of the knife tips has a protrusion protruding outward from a side of the main tube, and each of the protrusions extends into the corresponding positioning hole.

8. The air knife according to any one of claims 1 to 4, wherein the main tube comprises a tube body and two blocking units for blocking both ends of the tube body, the blocking units comprise an end cap for covering an end of the tube body and a locking member for passing through the end cap and the end of the tube body, respectively, and a plurality of the tips are arranged side by side on an outer circumferential surface of the tube body and communicate with the tube body.

9. The air knife according to any one of claims 1-4, wherein two opposite sides of each knife mouth are respectively provided with a limiting part, and one end of each limiting part far away from the main tube extends to one end of each knife mouth far away from the main tube.

10. The drying device is characterized by comprising a fan, a conveying mechanism and the air knife according to any one of claims 1 to 9, wherein the conveying mechanism is used for driving a workpiece to be dried to move, the air knife is arranged at a position opposite to the conveying mechanism, and the fan is communicated with the air inlet of the main pipe.

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