A method for preventing spray gun from clogging and a multi-component spray gun for spraying fast-solidifying materials

Abstract

The present invention relates to a method for preventing a spray gun from being blocked and a multi-component spray gun for spraying fast-setting materials, such as polyurethane foam, polyurea, etc., which react quickly after their components are mixed and usually solidify within a few seconds. The present invention aims to solve the problem of blockage of an air-cleaning multi-component spray gun when spraying fast-setting materials. In order to achieve this purpose, an air passage for leaking fast-setting materials to be discharged is designed in the front end chamber of the spray gun. When the spray gun trigger is pulled to spray the fast-setting materials, if the fast-setting materials leak to the front end chamber in the area where the side seal contacts the mixing chamber, the leaked fast-setting materials will be blown out of the spray gun from the air passage along with the passing compressed air, so that they will not accumulate in the front end chamber to react and solidify and block the spray gun, thus completely solving the problem of spray gun blockage.

Description

Technical Field

[0001] The present invention relates to a method for preventing a spray gun from being blocked and a multi-component spray gun for spraying fast-setting materials, and the present invention aims to solve the problem of blockage of an air-cleaning multi-component spray gun when spraying fast-setting materials. Fast-setting materials such as polyurethane foam and polyurea react quickly after their components are mixed and usually solidify within a few seconds. Background Art

[0002] The well-known air-cleaned multi-component spray guns for spraying fast-setting materials often leak fast-setting materials from the contact area between the side seal and the mixing chamber to the front chamber of the spray gun. If the leakage occurs when the spray gun trigger is pulled to spray the fast-setting materials, not only can the leakage not be found, but the leaked fast-setting materials accumulate in the front chamber and react and solidify, blocking the front chamber and causing the spray gun to fail to work. Severe leakage may even cause the fast-setting materials to enter the gun body from the front chamber, causing the front chamber and the gun body to be blocked at the same time. Since the solidified materials are very strong, it usually takes a long time to clean up these solidified materials. Improper cleaning may even cause the spray gun to be damaged and scrapped, which greatly affects the construction efficiency of the fast-setting materials. Summary of the invention

[0003] In order to achieve the purpose of preventing an air-cleaning multi-component spray gun from being blocked when spraying a rapidly solidifying material, the present invention provides a method for preventing a spray gun from being blocked and a multi-component spray gun for spraying a rapidly solidifying material.

[0004] In a first aspect, the present invention provides a method for preventing a spray gun from being clogged, wherein an air passage for discharging leaked fast-solidifying materials is designed in the front end chamber of the spray gun, and the air passage guides the compressed air entering the front end chamber to be blown out to the outside of the spray gun through the area where the side seal and the mixing chamber are in contact; when the spray gun trigger is pulled to spray the fast-solidifying material, if the fast-solidifying material leaks into the front end chamber in the area where the side seal and the mixing chamber are in contact, the leaked fast-solidifying material will be blown out to the outside of the spray gun from the air passage along with the passing compressed air, and will not accumulate in the front end chamber to react and solidify to clog the spray gun.

[0005] The direction of the air blown out of the air channel to the outside of the spray gun is different from the direction in which the mixing chamber sprays the rapid solidification material. Regardless of the size of the air blown out of the air channel, the pattern of the rapid solidification material sprayed out of the mixing chamber is not affected.

[0006] By observing whether the air blown out of the air passage contains fast-solidifying materials, it can be determined whether fast-solidifying materials have leaked into the front chamber. If the air blown out of the air passage is clean air, it means that no fast-solidifying materials have leaked into the front chamber; if the air blown out of the air passage contains fast-solidifying materials, it means that fast-solidifying materials have leaked into the front chamber.

[0007] By blowing out the amount of fast-solidifying material in the air from the air passage, it can be roughly determined whether it is a small amount of leakage or a serious leakage. For the case where a small amount of fast-solidifying material leaks into the front chamber, since the leaked fast-solidifying material is continuously blown out from the air passage, it will not accumulate in the front chamber to react and solidify and block the spray gun, so that it can be achieved without stopping the gun for maintenance and continuing to spray. The spray gun can be maintained after work, which can save a lot of working time, which is impossible to achieve with traditional spray guns. For the case where a large amount of fast-solidifying material leaks into the front chamber, since the leaked fast-solidifying material is continuously blown out from the air passage, it will not accumulate in the front chamber to react and solidify and block the spray gun, and the spray gun can be quickly disassembled to replace consumables. This changes the way that traditional spray guns only spend a lot of time and considerable labor intensity to repair the spray gun when it is blocked. The present invention makes the working state of the spray gun visible, and completely solves the most troublesome clogging problem of multi-component spray guns that spray fast-solidifying materials, which greatly improves the construction efficiency of fast-solidifying materials and reduces the risk of damage to the spray gun.

[0008] In a second aspect, the present invention provides a multi-component spray gun for spraying rapidly solidifying materials, wherein the front end chamber of the spray gun of the present invention utilizes the method for preventing the spray gun from being blocked provided by the present invention, and an air passage is designed in the front end chamber for discharging leaked rapidly solidifying materials, and the air passage guides the compressed air entering the front end chamber to be blown out to the outside of the spray gun through the area where the side seal contacts the mixing chamber.

[0009] The leakage discharge valve is located in the front chamber. By rotating the leakage discharge valve, the size of the air blown out of the leakage discharge nozzle can be adjusted. The direction of the air blown out of the leakage discharge nozzle to the outside of the spray gun is different from the direction of the rapid solidification material sprayed from the mixing chamber. Regardless of the size of the air blown out of the leakage discharge nozzle, it will not affect the pattern of the rapid solidification material sprayed out by the spray gun.

[0010] The grease fitting is located on the gun body, and several air channels inside the gun body connect the grease fitting, air piston, trigger piston, and front end chamber. Without disassembling the spray gun, grease can be added through the grease fitting, and the grease can be blown into the chambers of the gun body and the front end chamber along several air channels by compressed air to lubricate the O-rings and metal parts in the chamber, reduce wear, and extend the working time of the spray gun as much as possible. The maintenance and lubrication of the spray gun can be completed without disassembling the spray gun, thereby avoiding the crystallization and curing problem of the components of the fast-setting materials such as resins or isocyanates when exposed to the air.

[0011] The side seal box, filter check valve, and shutoff valve are fixed in the A housing and the B housing by threads. The side seal box, filter check valve, and shutoff valve each have an O-ring to seal with the A housing and the B housing. The installation position of the O-ring is closer to the fluid than the thread, so that the fluid will not contact the threads of the side seal box, filter check valve, and shutoff valve at the fixed position with the A housing and the B housing. Therefore, the resin or isocyanate component will not crystallize at the thread, causing the thread to stick, and the thread will not be disassembled with considerable labor intensity and damaged.

[0012] The side seal box includes a shell and a side seal. The inner hole of the shell is a through hole, and the diameter of any position of the inner hole is greater than the maximum diameter of the side seal. When the O-ring on the side seal needs to be replaced, a tool can be used to contact the non-sealing surface of the side seal to push the side seal toward the other end of the shell. The tool used will not contact the sealing surface of the side seal and will not damage the sealing surface of the side seal. Therefore, unlike the existing spray gun, the side seal can only be taken out from one end of the shell, and the tool used will contact the sealing surface of the side seal. Since the sealing surface of the side seal is similar to a very smooth mirror surface, the tool used can easily damage the sealing surface of the side seal. Once the sealing surface of the side seal is damaged, not only will the sealing surface of the mixing chamber in contact with the side seal be damaged, the sealing surface of the mixing chamber is also similar to a very smooth mirror surface, and the rapid solidification material will also leak into the spray gun, causing a great hidden danger of spray gun clogging.

[0013] These and other objects of the present invention will become more fully apparent from the following description taken in conjunction with the accompanying drawings, in which like reference numerals designate the same or similar parts throughout the several views. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 It is a schematic diagram of the working principle of the method for preventing spray gun clogging of the present invention when no rapid solidification material leaks into the front end chamber.

[0015] Attached Figure 2 The present invention is a method for preventing spray guns from being blocked, and is a schematic diagram of the working principle when rapid solidification material leaks into the front end chamber.

[0016] Attached Figure 3 It is a side perspective view of the spray gun of the present invention.

[0017] Attached Figure 4 It is another side perspective view of the spray gun of the present invention.

[0018] Attached Figure 5 It is a partial cross-sectional view of a spray gun of the present invention.

[0019] Attached Figure 6 It is an exploded view of the A side block of the spray gun of the present invention.

[0020] Attached Figure 7 It is the B side block exploded view of the spray gun of the present invention.

[0021] Attached Figure 8 A partial cross-sectional view of the A side block of the spray gun of the present invention is shown.

[0022] Attached Fig. 9 A partial cross-sectional view of the B side block of the spray gun of the present invention is shown.

[0023] Attached Fig.10 The side seal box of the spray gun of the present invention is shown in an exploded view. Figure 1 .

[0024] Attached Fig.11 The side seal box of the spray gun of the present invention is shown in an exploded view. Figure 2 .

[0025] Attached Fig.12 A partial cross-sectional view and exploded view of a side seal box of a spray gun of the present invention are shown.

[0026] Attached Fig.13 An exploded view of a filter check valve of a spray gun of the present invention is shown.

[0027] Attached Fig.14 An exploded view of a shutoff valve of a spray gun according to the present invention is shown.

[0028] Attached Fig.15 Exploded view of the spray gun of the present invention. DETAILED DESCRIPTION

[0029] The method for preventing spray gun from being blocked of the present invention is as follows: Figure 1 and 2 As fully shown in the figure, the front end chamber 16 of the spray gun is designed with an air passage 16b for discharging the leaked fast-solidifying material. The air passage 16b guides the compressed air 44 entering the front end chamber 16 to be blown out to the outside of the spray gun through the area where the side seal 30 contacts the mixing chamber 18; the direction of the air blown out of the spray gun by the air passage 16b is different from the direction in which the mixing chamber 18 sprays the fast-solidifying material, and the pattern of the mixing chamber 18 spraying the fast-solidifying material is not affected regardless of the size of the air blown out by the air passage 16b.

[0030] As attached Figure 1 As shown, when the spray gun trigger is pulled to spray the fast-solidifying material, during the process of the fast-solidifying material and its component fluids 45 and 46 being transported from the side seal 30 to the mixing chamber 18, there is no leakage into the front end chamber 16 in the area where the side seal 30 contacts the mixing chamber 18, and the compressed air 44 that enters the front end chamber 16 passes through the area where the side seal 30 contacts the mixing chamber 18, and clean air 44 is blown out from the air passage 16b.

[0031] As attached Figure 2 As shown, when the trigger of the spray gun is pulled to spray the fast-solidifying material, the fast-solidifying material and its component fluids 45 and 46 are transported from the side seal 30 to the mixing chamber 18. In the process, the side seal 30 and the mixing chamber 18 are in contact with each other and leak into the front end chamber 16. The compressed air 44 that enters the front end chamber 16 passes through the side seal 30 and the mixing chamber 18. The air 44, fluid 45 and fluid 46 are blown out from the air passage 16b, so that the fluids 45 and 46 will not accumulate in the front end chamber 16 to react and solidify to clog the spray gun.

[0032] The multi-component spray gun for spraying the rapid solidification material of the present invention is attached Figure 3 , 4 , 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15 are fully shown.

[0033] As attached Figure 5 As shown, the front end chamber 16 of the spray gun of the present invention utilizes the method for preventing the spray gun from being blocked provided by the present invention, and an air passage 16b is designed in the front end chamber 16 for discharging leaked fast-solidifying materials, and the air passage 16b guides the compressed air entering the front end chamber 16 to be blown out to the outside of the spray gun through the area where the side seal 30 contacts the mixing chamber 18.

[0034] As attached Figure 5 As shown, the leakage discharge valve 23 is installed in the front chamber 16 and is sealed with the front chamber 16 through an O-ring 26. The leakage discharge nozzle 41 is fixed on the air passage 16b in the front chamber 16. The conical surface on the top of the leakage discharge valve 23 can completely seal the air passage 16b. The size of the air blown out of the leakage discharge nozzle 41 can be adjusted by rotating the leakage discharge valve 23. The direction of the air blown out of the leakage discharge nozzle 41 to the outside of the spray gun is different from the direction of the mixing chamber 18 spraying the rapid solidification material. Regardless of the size of the air blown out by the leakage discharge nozzle 41, the pattern of the rapid solidification material sprayed out of the mixing chamber 18 is not affected.

[0035] As attached Figure 5 As shown, the spray gun is connected to the compressed air source through the air interface 11, the grease nipple 14 is located on the gun body 1, and several air channels 1a, 1b, 1c located inside the gun body 1 connect the grease nipple 14, the air piston 2, the trigger piston 7, and the front chamber 16. Without disassembling the spray gun, grease is added through the grease nipple 14. The grease can enter the chambers 1d and 1e of the gun body 1 along the air channel 1a in the gun body 1, and enter the chamber 16a of the front chamber 16 along the air channels 1b and 1c, so as to lubricate the O-rings and metal parts in the chambers and extend the working time of the spray gun as much as possible. The maintenance and lubrication of the spray gun can be completed without disassembling the spray gun, thereby avoiding the crystallization and curing problems of the components of the fast-solidifying materials, such as resins or isocyanates, when they are exposed to the air.

[0036] As attached Figure 6 As shown, the A side block includes an A housing 28 , a side sealing box 47 , a filter check valve 48 , a shutoff valve 49 and a screw 42 .

[0037] As attached Figure 7 As shown, the B side block includes a B housing 40 , a side sealing box 47 , a filter check valve 48 , a shutoff valve 49 and a screw 42 .

[0038] As attached Figure 3 and 4 As shown, the A side block and the B side block are fixed to the two sides of the front end chamber 16 by two screws 19 respectively.

[0039] As attached Fig.10 As shown, the side seal box 47 is composed of a housing 31 , a side seal 30 , a spring 29 and O-rings 8 and 38 .

[0040] As attached Fig.13 As shown, the filter check valve 48 is composed of a main body 32 , an O-ring 38 , a filter screen 43 , a spring 33 , a steel ball 39 and a valve seat 34 .

[0041] As attached Fig.14 As shown, the shut-off valve 49 is composed of a valve stem 35 , a nut 36 , an O-ring 8 and a gasket 37 .

[0042] As attached Figure 8 As shown, the side seal box 47, the filter check valve 48, and the shut-off valve 49 are fixed to the A housing 28 by threads. The O-ring 38 on the side seal box 47 cooperates with the A housing 28 for sealing, and the installation position of the O-ring 38 on the side seal box 47 is closer to the fluid than the thread 31a on the side seal box 47, so that the fluid will not contact the thread 31a on the side seal box 47 and the thread 28a on the A housing 28. The O-ring 38 on the filter check valve 48 cooperates with the A housing 28 for sealing, and the installation position of the O-ring 38 on the filter check valve 48 is closer to the fluid than the thread 32a on the filter check valve 48, so that the fluid will not contact the thread 32a on the filter check valve 48 and the thread 28b on the A housing 28. The O-ring 8 on the shutoff valve 49 cooperates with the A housing 28 for sealing, and the installation position of the O-ring 8 on the shutoff valve 49 is closer to the fluid than the thread 35a on the shutoff valve, so that the fluid does not contact the thread 35a on the shutoff valve 49 and the thread 28c on the A housing 28. Therefore, the resin or isocyanate component will not crystallize at the thread, causing the thread to stick, and it will not be disassembled with considerable labor intensity and damage the thread.

[0043] As attached Fig. 9As shown, the side seal box 47, the filter check valve 48, and the shut-off valve 49 are fixed to the B housing 40 by threads. The O-ring 38 on the side seal box 47 cooperates with the B housing 40 for sealing, and the installation position of the O-ring 38 on the side seal box 47 is closer to the fluid than the thread 31a on the side seal box 47, so that the fluid will not contact the thread 31a on the side seal box 47 and the thread 40a on the B housing 40. The O-ring 38 on the filter check valve 48 cooperates with the B housing 40 for sealing, and the installation position of the O-ring 38 on the filter check valve 48 is closer to the fluid than the thread 32a on the filter check valve 48, so that the fluid will not contact the thread 32a on the filter check valve 48 and the thread 40b on the B housing 40. The O-ring 8 on the shutoff valve 49 cooperates with the B housing 40 for sealing, and the installation position of the O-ring 8 on the shutoff valve 49 is closer to the fluid than the thread 35a on the shutoff valve 49, so that the fluid does not contact the thread 35a on the shutoff valve 49 and the thread 40c on the B housing 40. Therefore, the resin or isocyanate component will not crystallize at the thread, causing the thread to stick, and it will not be disassembled with considerable labor intensity and damage the thread.

[0044] As attached Fig.10 , 11 As shown in FIG. 12 , the inner hole of the housing 31 of the side seal box 47 is a through hole, and the diameter d2 of any position of the inner hole is greater than the maximum diameter d1 of the side seal 30. When the O-ring 8 on the side seal 30 needs to be replaced, the side seal 30 can be pushed out toward the other end of the housing 31 by contacting the non-sealing surface 30b of the side seal 30 with a tool, and the tool used will not contact the sealing surface 30a of the side seal 30, and will not damage the sealing surface 30a of the side seal 30.

[0045] Various changes and modifications may be made to the method without departing from the spirit and scope as defined by the following claims.

Claims

1. A method for preventing a spray gun from being blocked, characterized in that: The spray gun comprises: a gun body and a front end chamber; The method for preventing the spray gun from being blocked comprises: An air passage is designed in the front chamber of the spray gun for discharging leaked rapid solidification materials. The air passage guides the compressed air entering the front chamber to be blown out to the outside of the spray gun through the area where the side seal contacts the mixing chamber. The direction of the air blown out of the spray gun by the air passage is different from the direction of the rapid solidification materials sprayed from the mixing chamber. When the spray gun trigger is pulled to spray the fast-solidifying material, if the fast-solidifying material leaks into the front chamber in the area where the side seal contacts the mixing chamber, the leaked fast-solidifying material will be blown out of the spray gun from the air passage along with the passing compressed air; The degree of leakage in the area where the side seal contacts the mixing chamber is judged by blowing out the amount of the fast-solidifying material contained in the compressed air from the air passage; when a small amount of the fast-solidifying material leaks into the front end chamber, the leaked fast-solidifying material is continuously blown out from the air passage, and will not accumulate in the front end chamber to clog the spray gun; after the work is completed, the regional leakage of the spray gun is repaired; when a large amount of the fast-solidifying material leaks into the front end chamber, the leaked fast-solidifying material is continuously blown out from the air passage, and will not accumulate in the front end chamber to clog the spray gun; the spray gun can be quickly disassembled to replace consumables.

2. A method for preventing spray gun from being blocked according to claim 1, characterized in that: By observing whether the air blown out of the air passage contains fast-solidifying materials, it can be determined whether fast-solidifying materials have leaked into the front end chamber; if the air blown out of the air passage is clean air, it means that no fast-solidifying materials have leaked into the front end chamber; If the air blown out of the air passage contains fast-solidifying material, it indicates that fast-solidifying material has leaked into the front end chamber.

3. The method for preventing spray gun from being blocked according to claim 1, characterized in that: The spray gun also includes a plurality of air passages located inside the gun body, wherein the plurality of air passages are connected to a grease nozzle, an air piston, a trigger piston, and a front end chamber.

4. The method for preventing spray gun from being blocked according to claim 1, characterized in that: The spray gun also includes: a leakage discharge nozzle located in the front end chamber; A leakage discharge valve is located in the front chamber; the size of the air blown out of the leakage discharge nozzle can be adjusted by rotating the leakage discharge valve; the direction of the air blown out of the leakage discharge nozzle to the outside of the spray gun is different from the direction of the mixing chamber spraying the fast-solidifying material.

5. The method for preventing spray gun from being blocked according to claim 1, characterized in that: The spray gun also includes an A side block and a B side block fixed on both sides of the front end chamber by screws, the A side block includes an A shell, a side sealing box, a filter check valve and a shut-off valve; the B side block includes a B shell, a side sealing box, a filter check valve and a shut-off valve; the side sealing box, the filter check valve and the shut-off valve are fixed in the A shell and the B shell by threads, and the side sealing box, the filter check valve and the shut-off valve each have an O-ring that cooperates with the A shell and the B shell to seal, and the installation position of the O-ring is closer to the fluid than the thread, so that the fluid will not contact the threads of the side sealing box, the filter check valve, the shut-off valve and the A shell and the B shell at the fixed position.

6. The method for preventing a spray gun from being clogged according to claim 5, wherein the side sealing box comprises a shell and a side sealing member, the inner hole of the shell is a through hole, and the diameter of the inner hole at any position is greater than the maximum diameter of the side sealing member.

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