A slit type quantitative spray head structure for three-proofing paint spraying

Abstract

The present application belongs to the technical field of spraying structure, and discloses a kind of slit formula quantitative spray head structure for three-proof paint spraying, including spraying rack, and spray head assembly is provided on spraying rack, and the bottom of spray head assembly is rotatably provided with slit marking roller assembly, various different specifications of spraying slit are integrated on marking roller in the present application, when the specification of spraying slit changes, only need to rotate marking roller, only when the through slot and marking roller slit directly below spraying hole are rotated in the present application slit marking roller assembly in spray head assembly, only in the passage use state, other through slot and marking roller slit on marking roller are in the plugging idle state at the periphery of central roller, one-way fixed-point driving arm assembly and fixed-angle conversion arm assembly form one-way power transmission structure between them, through this structure, realize power transmission when forward rotation and power failure when reverse rotation, and further solve the problem that spraying slit will reset due to reverse rotation of slit marking roller assembly when electromagnetic push disc assembly resets.

Description

Technical Field

[0001] This invention belongs to the field of spraying structure technology, specifically relating to a slit-type metering nozzle structure for conformal coating spraying. Background Technology

[0002] During the conformal coating process, the specifications of the spray slits directly determine the coating width, uniformity, and film thickness. Therefore, the size of the spray slits needs to be adjusted quickly and accurately according to different PCB board sizes and coating requirements.

[0003] Currently, most common slit spray nozzles employ a fixed slit structure. When changing the slit size, it is usually necessary to disassemble the nozzle, replace the slit plate, or adjust mechanical components. This method is cumbersome, time-consuming, and prone to introducing errors during replacement, affecting spraying accuracy and consistency. Furthermore, while adjustable slit structures exist in existing technologies, they often rely on complex mechanical adjustment mechanisms or electronic control systems, which are not only costly but also structurally complex, difficult to maintain, and lack reliability in continuous production environments.

[0004] On high-precision, high-efficiency automated production lines, frequent changes in slit specifications can lead to production interruptions and reduce overall production efficiency. Furthermore, traditional slit-changing mechanisms often lack an effective positioning and retention mechanism after slit changes, making them prone to slit misalignment due to vibration or resetting actions, thus affecting coating quality.

[0005] Therefore, there is an urgent need for a slit-type quantitative spray head that is simple in structure, quick in slit switching, precise in positioning, and does not require a complex control system, so as to achieve rapid and reliable switching of slit specifications during the conformal coating process and improve the automation level and production efficiency of the spraying operation. Summary of the Invention

[0006] To address the problems mentioned in the background section, this invention provides a slit-type metering nozzle structure for conformal coating, which features precise positioning and eliminates the need for a complex control system.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a slit-type quantitative spray head structure for conformal coating, comprising a spray frame, a spray head assembly mounted on the spray frame, a slit label changing roller assembly rotatably mounted at the bottom of the spray head assembly, and, through the rotation of the slit label changing roller assembly within the spray head assembly, a structure in which the spray slit specifications can be changed is formed at the bottom of the spray head assembly. A one-way fixed-point drive arm assembly is rotatably mounted on one side of the bottom of the spray head assembly, and a fixed-angle conversion arm assembly is mounted on the side of the one-way fixed-point drive arm assembly away from the slit label changing roller assembly. An electromagnetic pusher assembly is fitted on one side of the component. A one-way fixed-point drive arm assembly and a fixed-angle conversion arm assembly form a one-way power transmission structure. By energizing the electromagnetic pusher assembly, the electromagnetic pusher assembly drives the one-way fixed-point drive arm assembly to rotate one revolution through the fixed-angle conversion arm assembly. This drives the slit label changing roller assembly to rotate and stop at a fixed point within the nozzle assembly. During the de-energization and reset process of the electromagnetic pusher assembly, the one-way power transmission structure between the one-way fixed-point drive arm assembly and the fixed-angle conversion arm assembly prevents the slit label changing roller assembly from resetting in the slit position within the nozzle assembly.

[0008] In a preferred embodiment of a slit-type metering nozzle structure for conformal coating, the nozzle assembly includes a frame nozzle with a spray hole at its bottom. A slit chamber is fixedly disposed below the spray hole. An end chamber is fixedly disposed at one end of the slit chamber. A slit roller groove is formed inside the slit chamber. A center roller is fixedly disposed on one side of the inner wall of the slit roller groove. A vertical groove is formed inside the center roller. A first vertical plate and a second vertical plate are fixedly disposed inside the end chamber. A strong magnet is fixedly disposed on the side of the second vertical plate away from the first vertical plate. A guide slide is fixedly disposed between the second vertical plate and the end chamber.

[0009] In a preferred embodiment of a slit-type metering nozzle structure for conformal coating, the slit label-changing roller assembly includes a label roller shaft, a label roller drive wheel fixedly mounted at one end of the label roller shaft, and a label-changing roller fixedly mounted at the other end of the label roller shaft. The label-changing roller has multiple through slots and multiple label roller slits, and a rotating seat groove is formed at the center of the label-changing roller. The label roller drive wheel has a drive wheel straight groove and a drive wheel arc groove. The label roller shaft is rotatably mounted on the slit seat chamber via bearings. The label-changing roller rotates within the slit roller groove, and the label roller drive wheel rotates within the gap between the first vertical plate and the slit seat chamber.

[0010] In a preferred embodiment of a slit-type metering nozzle structure for conformal coating, the unidirectional fixed-point drive arm assembly includes a drive main arm rod, one end of which is fixedly provided with a drive sleeve, and the other end of which is fixedly provided with an incomplete wheel. An actuating arm is fixedly provided on the incomplete wheel, and one end of the actuating arm is fixedly provided with an actuating lever. A pawl is rotatably provided on the inner wall of the drive sleeve, and a contact spring is fixedly provided between the pawl and the inner wall of the drive sleeve. The drive main arm rod is rotatably mounted on a first vertical plate via a bearing. The incomplete wheel and the actuating arm are rotatably positioned within the gap between the first vertical plate and the slit housing. The drive sleeve is rotatably positioned within the gap between the first vertical plate and the second vertical plate.

[0011] In a preferred embodiment of a slit-type metering nozzle structure for conformal coating, the fixed-angle conversion arm assembly includes a conversion arm shaft, one end of which is fixedly provided with a conversion arm pivot, and the other end of which is fixedly provided with a ratchet. A spiral groove is provided on the conversion arm pivot. The conversion arm shaft is rotatably mounted on a second vertical plate via a bearing. The ratchet is rotatably mounted in the gap between the first and second vertical plates. The conversion arm pivot is rotatably mounted in the gap between the second vertical plate and the end chamber.

[0012] In a preferred embodiment of a slit-type metering nozzle structure for conformal coating, the electromagnetic pusher assembly includes an annular pusher. A pusher electromagnet is fixedly mounted on one side of the annular pusher, and a pusher spring is fixedly mounted on the other side of the annular pusher. A pusher protrusion is fixedly mounted on the inner wall of the annular pusher, and a pusher side groove is formed on the edge of the annular pusher. The electromagnetic pusher assembly is disposed in the gap between the second vertical plate and the end chamber. The annular pusher is sleeved on the conversion arm shaft platform, and the annular pusher slides on the guide slide rod through the pusher side groove.

[0013] In a preferred embodiment of a slit-type metering nozzle structure for conformal coating, the push plate protrusion is inserted into a spiral groove, the two ends of the push spring abut against the annular push plate and the end chamber respectively, the push plate electromagnet is positioned opposite to the powerful magnet, and the annular push plate is pushed by the push spring, causing the push plate electromagnet to move closer to the powerful magnet.

[0014] In a preferred embodiment of a slit-type metering nozzle structure for conformal coating, the ratchet and the drive sleeve are both disposed in the gap between the first vertical plate and the second vertical plate. The drive sleeve is sleeved on the outside of the ratchet. Through the push of the pawl by the abutment spring, a one-way meshing structure is formed between the pawl and the ratchet.

[0015] In a preferred embodiment of a slit-type metering nozzle structure for conformal coating, the incomplete wheel and the standard roller drive wheel are both disposed in the gap between the first vertical plate and the slit roller groove, the incomplete wheel and the standard roller drive wheel are on the same longitudinal plane, the label changing roller is rotatably sleeved on the outside of the central roller through a rotating seat groove, and a sealing gasket is provided between the label changing roller and the central roller.

[0016] In a preferred embodiment of a slit-type metering nozzle structure for conformal coating, the multiple slits on the label changing roller have different specifications, and the multiple through slots and multiple slits on the label changing roller are arranged one-to-one. The spraying hole is connected to the slits through the through slots and vertical slots.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. This invention integrates various spray slits of different specifications onto a label-changing roller. When the specifications of the spray slits change, only the label-changing roller needs to be rotated. At the same time, in order to ensure that only the spray channel directly opposite the spray hole is unobstructed during use, this invention has a central roller rotatably installed inside the label-changing roller. The central roller has a vertical groove. When the slit label-changing roller assembly rotates inside the nozzle assembly, only the through groove and the label roller slit directly below the spray hole are in the channel usage state. The other through grooves and label roller slits on the label-changing roller are in a blocked and idle state around the central roller.

[0019] 2. A one-way fixed-point drive arm assembly is rotatably provided on one side of the bottom of the nozzle assembly of the present invention. The one-way fixed-point drive arm assembly drives the slit label changing roller assembly to a fixed point, so that the one-way fixed-point drive arm assembly drives the spraying slits of different specifications on the slit label changing roller assembly to perform fixed-point repositioning and fixed-point stopping within the nozzle assembly. Through the above structure, the precise repositioning and rotation of multiple label roller slits on the label changing roller below the spraying hole and the position holding after repositioning and rotation are realized.

[0020] 3. In this invention, a fixed-angle conversion arm assembly is provided on the side of the unidirectional fixed-point drive arm assembly away from the slit label changing roller assembly. An electromagnetic push plate assembly is sleeved on the side of the fixed-angle conversion arm assembly away from the unidirectional fixed-point drive arm assembly. By energizing the electromagnetic push plate assembly, the electromagnetic push plate assembly drives the unidirectional fixed-point drive arm assembly to rotate precisely one revolution through the fixed-angle conversion arm assembly. This drives the slit label changing roller assembly to rotate and stop at a fixed point within the nozzle assembly. Through mechanical and electromagnetic drive structures, the precise rotation of the unidirectional fixed-point drive arm assembly and the slit label changing roller assembly is achieved without using a control module and complex sensors.

[0021] 4. The present invention forms a unidirectional power transmission structure between the unidirectional fixed-point drive arm assembly and the fixed-angle conversion arm assembly. Through this structure, power transmission during forward rotation and power failure during reverse rotation are realized, thereby solving the problem that the slit label changing roller assembly will reset due to reverse rotation when the electromagnetic push plate assembly is de-energized and reset. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a slit-type metering nozzle structure for conformal coating spraying according to the present invention;

[0023] Figure 2 This is a cross-sectional view of the internal structure of the nozzle assembly of the present invention;

[0024] Figure 3 This is a cross-sectional view of the nozzle assembly of the present invention;

[0025] Figure 4 This is a perspective view of the slit label-changing roller assembly of the present invention;

[0026] Figure 5 This is a cross-sectional view of the slit label-changing roller assembly of the present invention;

[0027] Figure 6 This is a perspective view of the unidirectional fixed-point drive arm assembly of the present invention;

[0028] Figure 7 This is a perspective view of the fixed angle conversion arm assembly and the electromagnetic push plate assembly of the present invention.

[0029] Explanation of reference numerals in the attached drawings: 100, Spraying frame; 200, Sprayer head assembly; 201, Frame sprayer head; 202, Spraying orifice; 203, Slit seat; 204, Slit roller groove; 205, Vertical groove; 206, Center roller; 207, First vertical plate; 208, Second vertical plate; 209, Strong magnet; 210, End compartment; 211, Guide slide bar; 300, Slit label changing roller assembly; 301, Label changing roller; 302, Through groove; 303, Label roller shaft; 304, Label roller drive wheel; 305, Drive wheel straight groove; 306, Drive wheel arc groove; 307, Label roller narrow groove. 308. Rotating seat groove; 400. One-way fixed-point drive arm assembly; 401. Drive main arm rod; 402. Incomplete wheel; 403. Actuating arm; 404. Actuating rod; 405. Drive sleeve; 406. Abutment spring; 407. Pawl; 500. Fixed angle conversion arm assembly; 501. Conversion arm shaft; 502. Ratchet; 503. Conversion arm axle; 504. Spiral slide groove; 600. Electromagnetic push plate assembly; 601. Annular push plate; 602. Push plate side groove; 603. Push plate electromagnet; 604. Push plate protrusion; 605. Push spring. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figures 1-7 As shown, this invention provides a slit-type quantitative spray head structure for conformal coating spraying, including a spray frame 100, a spray head assembly 200 mounted on the spray frame 100, a slit label-changing roller assembly 300 rotatably mounted at the bottom of the spray head assembly 200, the slit label-changing roller assembly 300 having spray slits of different specifications. Through the rotation of the slit label-changing roller assembly 300 within the spray head assembly 200, the bottom of the spray head assembly 200 forms a structure where the spray slit specifications can be changed. A one-way fixed-point drive arm assembly 400 is rotatably mounted on one side of the bottom of the spray head assembly 200. Through the fixed-point drive arm assembly 400 driving the slit label-changing roller assembly 300, the one-way fixed-point drive arm assembly 400 drives the spray slits of different specifications on the slit label-changing roller assembly 300 to perform fixed-point repositioning and fixed-point stopping within the spray head assembly 200. The one-way fixed-point drive arm assembly 400 is located away from the slits. A fixed-angle conversion arm assembly 500 is provided on one side of the slit label changing roller assembly 300. An electromagnetic pusher assembly 600 is sleeved on the side of the fixed-angle conversion arm assembly 500 away from the one-way fixed-point drive arm assembly 400. A one-way power transmission structure is formed between the one-way fixed-point drive arm assembly 400 and the fixed-angle conversion arm assembly 500. By energizing the electromagnetic pusher assembly 600, the electromagnetic pusher assembly 600 drives the one-way fixed-point drive arm assembly 400 to rotate precisely one revolution through the fixed-angle conversion arm assembly 500. This drives the slit label changing roller assembly 300 to rotate and stop at a fixed point within the nozzle assembly 200. During the de-energization and reset process of the electromagnetic pusher assembly 600, the one-way power transmission structure between the one-way fixed-point drive arm assembly 400 and the fixed-angle conversion arm assembly 500 prevents the reverse reset of the slit label changing roller assembly 300 during slit repositioning within the nozzle assembly 200.

[0032] In a preferred embodiment, please refer to Figure 3The nozzle assembly 200 includes a frame nozzle 201. The bottom of the frame nozzle 201 is provided with a spray hole 202. A slit chamber 203 is fixedly provided below the spray hole 202. An end chamber 210 is fixedly provided at the rear end of the slit chamber 203. A slit roller groove 204 is provided inside the slit chamber 203. A center roller 206 is fixedly provided on one side of the inner wall of the slit roller groove 204. A vertical groove 205 is provided inside the center roller 206. A first vertical plate 207 and a second vertical plate 208 are fixedly provided inside the end chamber 210. A strong magnet 209 is fixedly provided on the side of the second vertical plate 208 away from the first vertical plate 207. A guide slide rod 211 is fixedly provided between the second vertical plate 208 and the end chamber 210.

[0033] In this embodiment, the spray hole 202 is connected to the standard roller slit 307 through the through groove 302 and the vertical groove 205.

[0034] In a preferred embodiment, please refer to Figure 4 and Figure 5 The slit label changing roller assembly 300 includes a label roller shaft 303. A label roller drive wheel 304 is fixedly installed at one end of the label roller shaft 303, and a label changing roller 301 is fixedly installed at the other end of the label roller shaft 303. The label changing roller 301 has multiple through grooves 302 and multiple label roller slits 307, and a rotating seat groove 308 is opened at the center of the label changing roller 301. The label roller drive wheel 304 has a drive wheel straight groove 305 and a drive wheel arc groove 306.

[0035] In this embodiment, the standard roller shaft 303 is rotatably mounted on the slit housing 203 via bearings. The standard roller 301 rotates within the slit roller groove 204. The standard roller drive wheel 304 rotates within the gap between the first vertical plate 207 and the slit housing 203. Furthermore, the incomplete wheel 402 and the standard roller drive wheel 304 are on the same longitudinal plane.

[0036] In this embodiment, the label-changing roller 301 is rotatably mounted on the outside of the center roller 206 via a rotating seat groove 308. A sealing gasket is provided between the label-changing roller 301 and the center roller 206. The specifications of the multiple label roller slits 307 on the label-changing roller 301 are different. The multiple through slots 302 and multiple label roller slits 307 on the label-changing roller 301 are arranged one-to-one facing each other.

[0037] In a preferred embodiment, please refer to Figure 6 The one-way fixed-point drive arm assembly 400 includes a drive main arm 401, a drive sleeve 405 is fixedly installed at one end of the drive main arm 401, and an incomplete wheel 402 is fixedly installed at the other end of the drive main arm 401. A toggle arm 403 is fixedly installed on the incomplete wheel 402, and a toggle lever 404 is fixedly installed at the distal end of the toggle arm 403. A pawl 407 is rotatably installed on the inner wall of the drive sleeve 405, and a contact spring 406 is fixedly installed between the pawl 407 and the inner wall of the drive sleeve 405.

[0038] In this embodiment, the drive boom 401 is rotatably mounted on the first vertical plate 207 via bearings. The incomplete wheel 402 and the actuating arm 403 are rotatably mounted in the gap between the first vertical plate 207 and the slit seat 203. The drive sleeve 405 is rotatably mounted in the gap between the first vertical plate 207 and the second vertical plate 208.

[0039] In this embodiment, the drive sleeve 405 is fitted onto the outside of the ratchet 502. A one-way meshing structure is formed between the pawl 407 and the ratchet 502 by the pushing action of the abutment spring 406 against it. Both the incomplete wheel 402 and the standard roller drive wheel 304 are disposed within the gap between the first vertical plate 207 and the slit roller groove 204.

[0040] In a preferred embodiment, please refer to Figure 7 The fixed angle conversion arm assembly 500 includes a conversion arm shaft 501, a conversion arm axle 503 fixedly mounted at one end of the conversion arm shaft 501, and a ratchet 502 fixedly mounted at the other end of the conversion arm shaft 501. A spiral groove 504 is provided on the conversion arm axle 503.

[0041] In this embodiment, the conversion arm shaft 501 is rotatably mounted on the second vertical plate 208 via bearings. A ratchet 502 is rotatably mounted within the gap between the first vertical plate 207 and the second vertical plate 208. The conversion arm pivot 503 is rotatably mounted within the gap between the second vertical plate 208 and the end chamber 210. The helical groove 504 lies on a closed circle when projected onto the conversion arm pivot 503.

[0042] In this embodiment, both the ratchet 502 and the drive sleeve 405 are disposed in the gap between the first vertical plate 207 and the second vertical plate 208.

[0043] In a preferred embodiment, please refer to Figure 7 The electromagnetic push plate assembly 600 includes an annular push plate 601. A push plate electromagnet 603 is fixedly installed on one side of the annular push plate 601, and a push spring 605 is fixedly installed on the other side of the annular push plate 601. A push plate protrusion 604 is fixedly installed on the inner wall of the annular push plate 601, and a push plate side groove 602 is opened on the edge of the annular push plate 601.

[0044] In this embodiment, the electromagnetic pusher assembly 600 is disposed within the gap between the second vertical plate 208 and the end chamber 210. An annular pusher 601 is sleeved on the conversion arm pivot 503. The annular pusher 601 slides on the guide slide rod 211 via the pusher side groove 602. The pusher protrusion 604 is inserted into the spiral groove 504. The two ends of the push spring 605 abut against the annular pusher 601 and the end chamber 210, respectively. The pusher electromagnet 603 is positioned opposite the powerful magnet 209. Through the push of the pusher spring 605 against the annular pusher 601, the annular pusher 601 drives the pusher electromagnet 603 closer to the powerful magnet 209.

[0045] The working principle of this invention is as follows: During the application of conformal coating to PCB boards, different specifications of spray slits will produce different coating widths and uniformities. For example, the width of the slits. Existing technologies mostly change the slit specifications through mechanical structures. This requires the cooperation of various components, and to ensure the accuracy of the slit specification change, inspection is also required, which is time-consuming and labor-intensive. To overcome the above problems, this invention provides a slit label changing roller assembly 300 rotatably mounted at the bottom of the nozzle assembly 200. The slit label changing roller assembly 300 is provided with spray slits of different specifications. Through the rotation of the slit label changing roller assembly 300 within the nozzle assembly 200, a structure for changing the specifications of the spray slits is formed at the bottom of the nozzle assembly 200. Specifically, the label changing roller 301 has multiple through grooves 302 and multiple label roller slits 307, and the center of the label changing roller 301 has a rotating seat groove 308. The standard roller slits 307 have different specifications. Multiple through slots 302 and multiple standard roller slits 307 on the label changing roller 301 are arranged one-to-one. The spraying holes 202 are connected to the standard roller slits 307 through the through slots 302 and vertical slots 205. This invention integrates multiple spraying slits of different specifications on the label changing roller 301. When the specifications of the spraying slits change, only the label changing roller 301 needs to be rotated. At the same time, to ensure that only the spraying holes directly facing the spraying holes 202 are sprayed during use... The coating channel is unobstructed. In this invention, a central roller 206 is rotatably arranged inside the label changing roller 301. A vertical groove 205 is opened in the central roller 206. When the slit label changing roller assembly 300 rotates in the nozzle assembly 200, only the through groove 302 and the label roller slit 307 directly below the spray hole 202 are in the channel usage state. The other through grooves 302 and label roller slits 307 on the label changing roller 301 are in a blocked and idle state around the central roller 206.

[0046] It should be noted that the spray head 201 of the frame is equipped with a spraying structure that sprays out a metered amount of conformal paint and sprays it into the spraying hole 202. This structure is existing technology and will not be described in detail.

[0047] Based on the above, the slit label changing roller assembly 300 rotates to drive multiple label roller slits 307 to rotate below the spraying hole 202 for label changing operations on the spraying slits. In actual use, it is essential to ensure that after each rotation of the slit label changing roller assembly 300, the label roller slits 307 must rotate to below the spraying hole 202 and remain there. If there is a rotational deviation, it will cause misalignment between the spraying hole 202 and the label roller slits 307, thus affecting the application of the conformal coating. To solve this problem, a one-way fixed-point drive arm assembly 400 is rotatably provided on one side of the bottom of the spray head assembly 200. Through the one-way fixed-point drive arm assembly 400, the slit label changing roller assembly 300 is driven to rotate, so that the different specifications of the spraying slits on the slit label changing roller assembly 300 are rotated. The nozzle assembly 200 performs fixed-point repositioning and stationary positioning. In actual use, each time the incomplete wheel 402 rotates one revolution, the incomplete wheel 402 drives the standard roller shaft 303 and the label changing roller 301 to rotate a certain angle through the toggle lever 404 and the drive wheel groove 305. At this time, the multiple standard roller slits 307 on the label changing roller 301 are precisely repositioned and rotated below the spray hole 202. After the repositioning is completed, the incomplete wheel 402 rotates again in the standard roller drive wheel 304 through the drive wheel arc groove 306. Through the rotation of the incomplete wheel 402 in the drive wheel arc groove 306, the standard roller shaft 303 and the label changing roller 301 remain stationary. Through the above structure, the precise repositioning and rotation of the multiple standard roller slits 307 on the label changing roller 301 below the spray hole 202 and the positional maintenance after the repositioning and rotation are achieved.

[0048] Based on the above, in order to solve the angle problem of the unidirectional fixed-point drive arm assembly 400 during each rotation, i.e., the problem of one revolution as described above, the present invention provides a fixed-angle conversion arm assembly 500 on the side of the unidirectional fixed-point drive arm assembly 400 away from the slit label-changing roller assembly 300. An electromagnetic pusher assembly 600 is sleeved on the side of the fixed-angle conversion arm assembly 500 away from the unidirectional fixed-point drive arm assembly 400. By energizing the electromagnetic pusher assembly 600, the electromagnetic pusher assembly 600 drives the unidirectional fixed-point drive arm assembly 400 through the fixed-angle conversion arm assembly 500. The boom assembly 400 rotates precisely one revolution, thereby driving the slit label-changing roller assembly 300 to rotate and stop at a fixed point within the nozzle assembly 200. Specifically, the conversion arm pivot 503 is rotatably positioned within the gap between the second vertical plate 208 and the end chamber 210. The spiral groove 504 is positioned on a closed circle when projected onto the conversion arm pivot 503. The push plate protrusion 604 is inserted into the spiral groove 504. The push plate electromagnet 603 is positioned opposite the strong magnet 209. When it is necessary to change to a different label roller slit 307, the push plate is pushed... When the electromagnet 603 is energized, the magnetic force generated by the electromagnet 603 repulses the strong magnet 209. At this time, the annular push plate 601 overcomes the force of the push spring 605, causing the annular push plate 601 to slide towards the end of the conversion arm axle 503 away from the ratchet 502. During this process, the cooperation of the push plate protrusion 604 and the spiral groove 504 causes the conversion arm axle 503 and the conversion arm shaft 501 to rotate. It should be noted that the spiral groove 504 of this invention forms a closed circle when projected onto the conversion arm axle 503. The sliding of the push plate protrusion 604 within the spiral groove 504 ensures that when the annular push plate 601 moves, the conversion arm axle 503 and the conversion arm shaft 501 rotate only one revolution. The conversion arm shaft 501, through its power rotation with the unidirectional fixed-point drive arm assembly 400, further ensures that the unidirectional fixed-point drive arm assembly 400 rotates only one revolution each time. Through this mechanical and electromagnetic drive structure, precise rotation of the unidirectional fixed-point drive arm assembly 400 and the slit label changing roller assembly 300 is achieved without using a control module and complex sensors.

[0049] Based on the above, each time the electromagnetic pusher assembly 600 is energized, the electromagnetic pusher assembly 600, the fixed angle conversion arm assembly 500, and the one-way fixed point drive arm assembly 400 work together to drive the slit-changing label roller assembly 300 to rotate at a fixed point within the nozzle assembly 200 for slit changing. By controlling the number of times the electromagnetic pusher assembly 600 is energized, the rotational slit changing process for different specifications of spraying slits can be achieved. However, after each energization, when it is necessary to de-energize, the electromagnetic pusher assembly 600 will inevitably rotate at a fixed angle... The conversion arm assembly 500 and the one-way fixed-point drive arm assembly 400 drive the slit label-changing roller assembly 300 to rotate in the opposite direction. At this time, the spraying slit on the slit label-changing roller assembly 300 will reset, resulting in invalid slit replacement processing of the spraying slit. In order to solve the above problem and avoid invalid slit replacement processing of the spraying slit, the one-way fixed-point drive arm assembly 400 and the fixed-angle conversion arm assembly 500 of the present invention form a one-way power transmission structure. Specifically, the drive sleeve 405 is sleeved on the outside of the ratchet 502, and through abutment... Spring 406 pushes against pawl 407, forming a one-way meshing structure between pawl 407 and ratchet 502. When the electromagnetic pusher assembly 600 is energized, ratchet 502 drives the main boom rod 401 to rotate via pawl 407, which is recorded as forward rotation. When the electromagnetic pusher assembly 600 is de-energized and resets, the switching arm shaft 501 and ratchet 502 rotate in opposite directions, which is recorded as reverse rotation. Since pawl 406 can only pass through pawl 407 during forward rotation, ratchet 502 can only move through pawl 407 during forward rotation. 7 drives the main drive arm 401 to rotate. When it reverses, the teeth of the ratchet 502 and the pawl 407 cannot effectively engage. At this time, when the fixed angle conversion arm assembly 500 reverses, the power of the fixed angle conversion arm assembly 500 is no longer transmitted to the unidirectional fixed point drive arm assembly 400. Through this structure, the power transmission during forward rotation and the power failure during reverse rotation are realized, thereby solving the problem that when the electromagnetic push plate assembly 600 is de-energized and reset, the slit label changing roller assembly 300 will reset due to reverse rotation.

[0050] It should be noted that when the label changing roller 301 rotates within the slit roller groove 204, a sealed friction-increasing rubber pad is provided between the label changing roller 301 and the inner wall of the slit roller groove 204.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A slit-type metering nozzle structure for conformal coating spraying, comprising a spraying frame (100), characterized in that: A spray head assembly (200) is provided on the spraying frame (100). A slit marking roller assembly (300) is rotatably mounted on the bottom of the spray head assembly (200). By rotating the slit marking roller assembly (300) within the spray head assembly (200), the bottom of the spray head assembly (200) forms a structure where the spraying slit specifications can be changed. A one-way fixed-point drive arm assembly (400) is rotatably mounted on one side of the bottom of the spray head assembly (200). A fixed-angle conversion arm assembly (500) is provided on the side of the one-way fixed-point drive arm assembly (400) away from the slit marking roller assembly (300). An electromagnetic pusher assembly (600) is sleeved on the side of the fixed-angle conversion arm assembly (500) away from the one-way fixed-point drive arm assembly (400). A one-way power transmission structure is formed between the fixed-point drive arm assembly (400) and the fixed-angle conversion arm assembly (500). By energizing the electromagnetic push plate assembly (600), the electromagnetic push plate assembly (600) drives the one-way fixed-point drive arm assembly (400) to rotate one revolution through the fixed-angle conversion arm assembly (500), thereby driving the slit label changing roller assembly (300) to perform fixed-point rotation and stop at a fixed point within the nozzle assembly (200). During the de-energization and reset process of the electromagnetic push plate assembly (600), the one-way power transmission structure between the one-way fixed-point drive arm assembly (400) and the fixed-angle conversion arm assembly (500) prevents the slit label changing roller assembly (300) from reversing during slit repositioning within the nozzle assembly (200). The nozzle assembly (200) includes a frame nozzle (201), a spray hole (202) is provided at the bottom of the frame nozzle (201), a slit chamber (203) is fixedly provided below the spray hole (202), an end chamber (210) is fixedly provided at one end of the slit chamber (203), a slit roller groove (204) is provided inside the slit chamber (203), a center roller (206) is fixedly provided on one side of the inner wall of the slit roller groove (204), a vertical groove (205) is provided inside the center roller (206), a first vertical plate (207) and a second vertical plate (208) are fixedly provided inside the end chamber (210), a strong magnet (209) is fixedly provided on the side of the second vertical plate (208) away from the first vertical plate (207), and a guide slide rod (211) is fixedly provided between the second vertical plate (208) and the end chamber (210). The slit label changing roller assembly (300) includes a label roller shaft (303), a label roller drive wheel (304) is fixedly installed at one end of the label roller shaft (303), and a label changing roller (301) is fixedly installed at the other end of the label roller shaft (303). The label changing roller (301) has multiple through grooves (302) and multiple label roller slits (307) and a rotating seat groove (308) is opened at the center of the label changing roller (301). The label roller drive wheel (304) has a drive wheel straight groove (305) and a drive wheel arc groove (306). The standard roller shaft (303) is rotatably mounted on the slit housing (203) via a bearing, the standard changing roller (301) rotates in the slit roller groove (204), and the standard roller drive wheel (304) rotates in the gap between the first vertical plate (207) and the slit housing (203). The unidirectional fixed-point drive arm assembly (400) includes a drive main arm (401), a drive sleeve (405) is fixedly provided at one end of the drive main arm (401), and an incomplete wheel (402) is fixedly provided at the other end of the drive main arm (401). A toggle arm (403) is fixedly provided on the incomplete wheel (402), and a toggle lever (404) is fixedly provided at one end of the toggle arm (403). A pawl (407) is rotatably provided on the inner wall of the drive sleeve (405), and a contact spring (406) is fixedly provided between the pawl (407) and the inner wall of the drive sleeve (405). The fixed angle conversion arm assembly (500) includes a conversion arm shaft (501), one end of which is fixedly provided with a conversion arm axle platform (503), and the other end of which is fixedly provided with a ratchet (502). A spiral groove (504) is provided on the conversion arm axle platform (503). The electromagnetic push plate assembly (600) includes an annular push plate (601), a push plate electromagnet (603) is fixedly provided on one side of the annular push plate (601), and a push spring (605) is fixedly provided on the other side of the annular push plate (601). A push plate protrusion (604) is fixedly provided on the inner wall of the annular push plate (601), and a push plate side groove (602) is provided on the edge of the annular push plate (601).

2. The slit-type metering nozzle structure for conformal coating as described in claim 1, characterized in that: The drive boom (401) is rotatably mounted on the first vertical plate (207) via a bearing. The incomplete wheel (402) and the actuating arm (403) are rotatably mounted in the gap between the first vertical plate (207) and the slit seat (203). The drive sleeve (405) is rotatably mounted in the gap between the first vertical plate (207) and the second vertical plate (208).

3. The slit-type metering nozzle structure for conformal coating as described in claim 1, characterized in that: The conversion arm shaft (501) is rotatably mounted on the second vertical plate (208) via a bearing, the ratchet (502) is rotatably mounted in the gap between the first vertical plate (207) and the second vertical plate (208), and the conversion arm axle (503) is rotatably mounted in the gap between the second vertical plate (208) and the end chamber (210).

4. The slit-type metering nozzle structure for conformal coating as described in claim 1, characterized in that: The electromagnetic push plate assembly (600) is disposed in the gap between the second vertical plate (208) and the end compartment (210). The annular push plate (601) is sleeved on the conversion arm axle (503). The annular push plate (601) slides on the guide slide rod (211) through the push plate side groove (602).

5. The slit-type metering nozzle structure for conformal coating as described in claim 1, characterized in that: The push plate protrusion (604) is inserted into the spiral groove (504). The two ends of the push spring (605) abut against the annular push plate (601) and the end chamber (210) respectively. The push plate electromagnet (603) and the strong magnet (209) are arranged opposite each other. Through the push spring (605) pushing the annular push plate (601), the annular push plate (601) drives the push plate electromagnet (603) to move closer to the strong magnet (209).

6. The slit-type metering nozzle structure for conformal coating as described in claim 1, characterized in that: The ratchet (502) and the drive sleeve (405) are both located in the gap between the first vertical plate (207) and the second vertical plate (208). The drive sleeve (405) is sleeved on the outside of the ratchet (502). Through the push of the pawl (407) by the abutment spring (406), a one-way meshing structure is formed between the pawl (407) and the ratchet (502).

7. The slit-type metering nozzle structure for conformal coating as described in claim 1, characterized in that: The incomplete wheel (402) and the standard roller drive wheel (304) are both located in the gap between the first vertical plate (207) and the slit roller groove (204). The incomplete wheel (402) and the standard roller drive wheel (304) are on the same longitudinal plane. The label changing roller (301) is rotatably sleeved on the outside of the center roller (206) through the rotating seat groove (308). A sealing gasket is provided between the label changing roller (301) and the center roller (206).

8. The slit-type metering nozzle structure for conformal coating as described in claim 1, characterized in that: The specifications of the multiple standard roller slits (307) on the label changing roller (301) are different. The multiple through grooves (302) and multiple standard roller slits (307) on the label changing roller (301) are arranged one-to-one. The spraying hole (202) is connected to the standard roller slit (307) through the through groove (302) and the vertical groove (205).

Images