Dry ice cleaning spray gun

Abstract

The utility model relates to the technical field of circuit board cleaning equipment, in particular to a dry ice cleaning spray gun which comprises a gun body, the gun body is provided with a gas channel, and the gun body is provided with a gas inlet connector and a nozzle which are connected with a gas inlet channel; the gun body is provided with a switch valve used for opening and closing the gas channel, and an anti-blocking filtering piece is arranged in the gas channel. And an extending spray head is detachably arranged on the nozzle. The device has the effects that dry ice blockage can be prevented, and the cleaning effect of the residual glue at the break angle can be guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit board cleaning equipment, in particular to a dry ice cleaning spray gun. BACKGROUND

[0002] At present, the radio frequency antenna circuit board used in the field of aerospace usually adopts a multi-layer stepped circuit board design, so as to ensure that the weight and volume of the circuit board will not be too large, and at the same time, the stepped design can ensure that a terminal can be arranged on each layer of the board for external wiring.

[0003] The processing method of the radio frequency antenna circuit board processed by our company at present is: first, a single board is produced independently, and then the boards are placed in a semi-cured sheet, and then a hot pressing process is used to melt the semi-cured sheet to form glue to bond the two boards together. In order to prevent the glue from overflowing from the gap between the two boards during the pressing process, our company adopts a processing mold plate to block the side wall between the two boards to prevent the glue from overflowing.

[0004] At present, due to the processing tolerance and the processing tolerance of the board itself, the mold cannot be tightly attached to the board, so that when the pressure between the two boards increases during the hot pressing process, the glue flows out from the gap under the action of the pressure, and then cools and condenses on the terminal. Therefore, our company often uses a dry ice gun to spray a low-temperature jet to remove the glue. However, because the circuit board is a stepped circuit board, the opening of the current dry ice gun nozzle is large in order to prevent dry ice from blocking, which causes the jet to be not concentrated, and the residual glue at the corner is not easy to be removed. CONTENT OF THE INVENTION

[0005] In order to solve the above technical problems, the present application provides a dry ice cleaning spray gun, which has the advantages of being able to prevent dry ice from blocking and ensuring the cleaning effect of the residual glue at the corner.

[0006] In order to achieve the above purpose, the technical scheme of the present application is as follows:

[0007] A dry ice cleaning spray gun, comprising a gun body, a gas passage is arranged on the gun body, a gas inlet joint connected with the gas passage and a nozzle are arranged on the gun body;

[0008] A switch valve for opening and closing the gas passage is arranged on the gun body, and a blocking prevention filter is arranged in the gas passage;

[0009] An extension nozzle is detachably arranged on the nozzle.

[0010] To achieve the above technical solution, a low-temperature CO2 gas mixed with fine dry ice fragments is supplied into the gas channel of the gun body through an air inlet connector. The gas is then sprayed out through the nozzle, thereby achieving the effect of blowing away residual adhesive and burrs on the PCB board. The dry ice fragments are filtered through an anti-clogging filter so that they are broken into smaller pieces, pass through the anti-clogging filter, and then through the nozzle before exiting through the extension nozzle. At this point, the extension nozzle can be made long and thin to meet the adhesive removal treatment at the corners of the PCB board steps without being blocked by dry ice fragments.

[0011] As a preferred embodiment of this application, the anti-clogging filter element is a conical filter barrel, which has filter holes, expansion joints on its side walls, a retaining rib at its large end, and a retaining groove on its gas passage.

[0012] The above technical solution involves squeezing the entire conical filter barrel, causing it to shrink along the expansion joint so that it can be automatically inserted into the gas channel after the retaining ferrule contacts the slot, thus completing the assembly. At the same time, because it is conical, the filtration area is increased within the same space, thereby preventing blockage and ensuring the smooth supply of dry ice.

[0013] As a preferred embodiment of this application, the gun body is provided with a handle, and the handle is provided with a switch for controlling the opening and closing of the switching valve.

[0014] The above technical solution is implemented so that personnel can hold the handle and press the quick-close button with their fingers to open and close the entire dry ice cleaning spray gun, thus making it easier for personnel to use.

[0015] As a preferred embodiment of this application, the extended nozzle includes a spiral seat screwed to the gun body, and a conical nozzle is provided on the spiral seat, wherein the minimum diameter of the outer wall of the conical nozzle is 1-5mm.

[0016] The above technical solution enables the entire extended nozzle to be detachably configured into different specifications to meet different usage needs, and the conical design can further improve the dry ice injection pressure, thereby ensuring the adhesive removal effect.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. through the air inlet joint with dry ice supply equipment, so that the gun body into the gas channel mixed with fine dry ice powder low temperature CO2 gas, and then through the nozzle to the outside, so that the low temperature gas blowing PCB board residue and burr effect; through the anti-blocking filter piece filter dry ice powder, so that the dry ice powder into smaller volume through the anti-blocking filter piece after the nozzle after from the extension nozzle, at this time can be made of extension nozzle long, to meet the PCB board ladder corner of the glue processing, and will not be dry ice powder block. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0020] Figure 1 is the overall structure of the embodiment of the present application.

[0021] Figure 2 is the cross-sectional view of the embodiment of the present application.

[0022] Figure 3 is the schematic diagram of the conical filter barrel in the embodiment of the present application.

[0023] Reference signs: 1, gun body; 11, gas channel; 2, air inlet joint; 3, nozzle; 4, on-off valve; 5, handle; 6, switch; 7, extension nozzle; 71, spiral seat; 72, conical nozzle; 8, conical filter barrel; 81, filter hole; 82, expansion joint; 83, locking lug. DETAILED DESCRIPTION

[0024] The following will be described in detail in combination with the drawings Figures 1-3 The present application will be further described in detail.

[0025] The embodiment of the present application discloses a dry ice cleaning spray gun. Referring to Figure 1 , the dry ice cleaning spray gun comprises a gun body 1, the gun body 1 is provided with a gas channel 11, and the gun body 1 is provided with an air inlet joint 2 and a nozzle 3 connected with the air inlet channel. That is, through the air inlet joint 2 with the dry ice supply equipment, so that the gun body 1 into the gas channel 11 mixed with fine dry ice powder low temperature CO2 gas, and then through the nozzle 3 to the outside, so that the low temperature gas blowing PCB board residue and burr effect.

[0026] The gun body 1 is provided with a switch 6 valve 4 for opening and closing the gas passage 11, wherein the switch 6 valve 4 can be manually or electrically arranged, and the valve core can be arranged as a ball valve or a butterfly valve, etc. The gun body 1 is provided with a handle 5, and the handle 5 is provided with a switch 6 for controlling the opening and closing of the switch 6 valve 4. In order to facilitate personnel to hold the handle 5, the fingers press the quick closing to realize the opening and closing of the whole dry ice cleaning spray gun, thereby facilitating personnel to use.

[0027] The gas passage 11 is provided with an anti-blocking filter, and the nozzle 3 is detachably provided with an extension nozzle 7, that is, the dry ice fragments are filtered through the anti-blocking filter, and then the dry ice fragments are passed through the nozzle 3 and then from the extension nozzle 7, at this time the extension nozzle 7 can be made slender to meet the glue cleaning treatment of the stepped corner of the PCB board, and the dry ice fragments will not be blocked. The extension nozzle 7 includes a screw seat 71 screwed with the gun body 1, and the screw seat 71 is provided with a conical nozzle 72, and the outer wall of the conical nozzle 72 has a minimum diameter of 1-5 mm. So that the whole extension nozzle 7 can be detachably arranged in different specifications to meet different use requirements, and the conical arrangement can further improve the dry ice jet pressure to ensure the glue removal effect.

[0028] The anti-blocking filter is a conical filter barrel 8, the conical filter barrel 8 is provided with a filter hole 81, the side wall of the conical filter barrel 8 is provided with a telescopic joint 82, and the large end of the conical filter barrel 8 is provided with a clamping lug 83, and the gas passage 11 is provided with a clamping groove. That is, the whole conical filter barrel 8 can be squeezed, so that it is shrunk along the telescopic joint 82, so that it can be inserted into the gas passage 11 and the clamping lug 83 contacts the clamping groove to automatically insert, thereby completing its assembly. At the same time, because it is conical, the filtering area is increased in the same space, thereby preventing blockage and ensuring smoothness of dry ice supply.

[0029] The implementation principle of the dry ice cleaning spray gun of the embodiment of the application is that: the gas inlet joint 2 is communicated with the dry ice supply device, so as to supply the low-temperature CO2 gas mixed with small dry ice fragments into the gas passage 11 in the gun body 1, and then sprayed outward through the nozzle 3, so as to realize the effect of blowing off the residual glue and burrs on the PCB board by the low-temperature gas; the dry ice fragments are filtered through the anti-blocking filter, so that the dry ice fragments are passed through the nozzle 3 and then from the extension nozzle 7 after the dry ice fragments are made into smaller volumes, at this time the extension nozzle 7 can be made slender to meet the glue cleaning treatment of the stepped corner of the PCB board, and the dry ice fragments will not be blocked.

[0030] The above are the preferred embodiments of the application, which do not limit the protection scope of the application, therefore: any equivalent changes made on the basis of the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A dry ice cleaning lance characterized by: The utility model relates to a kind of airless spray gun, including gun body (1), gas passage (11) is provided on the gun body (1), inlet joint (2) and nozzle (3) are provided on the gun body (1) and connect with gas inlet passage; Switch (6) valve (4) for opening and closing gas passage (11) is provided on the gun body (1), and anti-blocking filter is provided in the gas passage (11); Nozzle (3) is detachably provided with extension spray head (7).

2. A dry ice cleaning lance according to claim 1, characterized in that: The anti-blocking filter is conical filter barrel (8), filter hole (81) is provided on the conical filter barrel (8), expansion joint (82) is provided on the sidewall of the conical filter barrel (8), and large end of the conical filter barrel (8) is provided with clamping lug (83), and the gas passage (11) is provided with clamping groove.

3. A dry ice cleaning lance according to claim 1, wherein: Handle (5) is provided on the gun body (1), and switch (6) for controlling opening and closing of switch (6) valve (4) is provided on the handle (5).

4. A dry ice cleaning lance according to claim 1, wherein: The extension spray head (7) includes a threaded seat (71) that is screwed to the gun body (1), and a conical spray head (72) is provided on the threaded seat (71). The outer wall of the conical spray head (72) has a minimum diameter of 1-5 mm.

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