Self-cleaning foaming gun

Abstract

The utility model discloses a self-cleaning foaming gun, and relates to the technical field of polyurethane foam high-pressure pouring and spraying equipment. Comprising an oil cylinder, a piston, a gun barrel and a gun head body, a gun barrel tail end center piston is arranged in the oil cylinder in the center of the gun barrel tail end, and a lock nut is arranged in a groove, located above the gun barrel tail end center piston, of the gun barrel tail end center; the center of the gun barrel tail end center piston and one end of the gun barrel tail end center gun barrel are connected in a penetrating mode and fixed through a gun barrel tail end center lock nut, a gun barrel containing hole for containing the other end of the gun barrel is formed in the center of the gun head body, and the gun head body is sequentially provided with a material returning unit, a correlation unit and a cleaning air hole in the longitudinal direction. The correlation unit is connected with a feeding hole located in the back face of the gun head body, a mixing hole and a discharging hole are formed in the center of the tail end of the gun barrel in the gun barrel containing hole, and the mixing hole is formed in the gun barrel at the same horizontal position as the correlation unit. By adopting the self-cleaning foaming gun, the problems of frequent gun head replacement, environmental pollution and the like are effectively solved.

Description

Technical Field

[0001] This utility model relates to the technical field of high-pressure casting and spraying equipment for polyurethane foam, and in particular to a self-cleaning foaming gun. Background Technology

[0002] High-pressure polyurethane foam mixing and spraying machines are used to rapidly mix isocyanate and polyether compounds and spray the mixture onto a predetermined object. The mixture undergoes a chemical reaction, forming polyurethane foam on the sprayed surface. The spray gun head is a key component in these machines. However, existing spray gun heads, due to structural limitations, must be removed after each application and cleaned with chemical solvents such as dichloromethane, leading to complex operation and serious environmental pollution.

[0003] In addition, the existing casting gun head and spray gun head are two different components with different functions and structures. Each of the two gun heads can only complete the corresponding casting or spraying work, which limits the scope of application of polyurethane foaming equipment. Therefore, a self-cleaning spray and casting gun head that does not require the addition of external chemical solvents is urgently needed. Utility Model Content

[0004] The purpose of this invention is to provide a self-cleaning foam gun that effectively solves the problems of frequent gun head replacement and environmental pollution, enabling the foam gun to have self-cleaning and integrated spraying and pouring functions.

[0005] To achieve the above objectives, this utility model provides a self-cleaning foaming gun, including a cylinder, a piston, a gun rod, and a gun head body. The piston is disposed inside the cylinder. A lock nut is disposed in a groove above the piston on the gun rod. The center of the piston is connected to one end of the gun rod through the cylinder and fixed by the lock nut. A gun rod placement hole is provided at the center of the gun head body for placing the other end of the gun rod. A material return unit, a counter-firing unit, and a cleaning air hole are arranged sequentially along the longitudinal direction of the gun head body. The counter-firing unit is connected to a feed hole located on the back of the gun head body. A mixing hole and a discharge hole are respectively disposed in the center of the end of the gun rod in the gun rod placement hole. The mixing hole is disposed in the gun rod at the same horizontal position as the counter-firing unit. The counter-firing unit is connected to both sides of the mixing hole. The discharge hole is longitudinally connected to the mixing hole.

[0006] Preferably, the material return unit includes a material return hole and a material return groove. The material return holes are symmetrically distributed on both sides of the gun rod placement hole, and the material return grooves are symmetrically arranged on both sides of the gun rod located in the gun rod placement hole. The material return holes are connected to the material return grooves.

[0007] Preferably, the through-fire unit includes through-fire holes and a pressure regulating valve symmetrically distributed on both sides of the gun barrel placement hole. The pressure regulating valve is connected to the through-fire holes, the back side of the through-fire holes is connected to the feed hole, and both sides of the mixing hole are connected to the through-fire holes.

[0008] Preferably, when the piston moves upward, the return groove is connected to the return hole; when the piston moves downward, the return groove is connected to both the return hole and the through hole.

[0009] Preferably, the cleaning vent is closed when the piston moves upward; and the cleaning vent is connected to the mixing vent when the piston moves downward.

[0010] Preferably, the stroke distance of the piston is equal to the longitudinal distance between the return hole and the through hole, the longitudinal length of the return groove, and the distance between the through hole and the cleaning air hole.

[0011] Preferably, an oil inlet and an oil outlet are respectively provided on one side of the oil cylinder, with the oil inlet located at the upper end of the oil cylinder and the oil outlet located at the lower end of the oil cylinder.

[0012] Therefore, the self-cleaning foam gun of this invention, with the above-described structure, has the following advantages compared with the prior art:

[0013] 1. It effectively avoids the need to frequently replace the gun head due to structural limitations and clean the gun head with chemical solvents such as dichloromethane. It also avoids the chemical solvents and viscous adhesives that may be encountered during manual cleaning, reduces environmental pollution generated during chemical solvent cleaning, and improves safety during use.

[0014] 2. It can automatically clean itself during or after use, reducing maintenance costs and material waste. Timely cleaning can prevent adhesive residue from clogging the gun body and extend the service life of the foam gun.

[0015] 3. Automatic cleaning ensures smooth operation and consistent foaming effect every time it is used, making operation simpler, reducing cleaning time, and thus guaranteeing construction quality and efficiency.

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a diagram showing the liquid circulation preparation state of an embodiment of a self-cleaning foaming gun according to the present invention;

[0018] Figure 2 This is a diagram showing the mixing and discharging state of a self-cleaning foaming gun according to an embodiment of the present invention; reference numerals are also provided.

[0019] 1. Hydraulic cylinder; 2. Piston; 3. Gun rod; 4. Gun head body; 5. Lock nut; 6. Gun rod placement hole; 7. Feed return unit; 8. Through-firing unit; 9. Cleaning air hole; 10. Feed inlet; 11. Mixing hole; 12. Discharge hole; 13. Oil inlet; 14. Oil outlet; 71. Feed return hole; 72. Feed return trough; 81. Through-firing hole; 82. Pressure regulating valve. Detailed Implementation

[0020] Example

[0021] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] like Figures 1-2 As shown, this utility model discloses a self-cleaning foaming gun, comprising a cylinder 1, a piston 2, a gun rod 3, and a gun head body 4. The piston 2 is housed inside the cylinder 1. A locking nut 5 is installed in a groove above the piston 2 on the gun rod 3. The center of the piston 2 is connected to one end of the gun rod 3 through-hole and fixed by the locking nut 5. The center of the gun head body 4 has a gun rod placement hole 6 for placing the other end of the gun rod 3. The gun head body 4 has a return material unit 7, a firing unit 8, and a cleaning air hole 9 arranged longitudinally. The firing unit 8 is connected to a feed hole 10 located on the back of the gun head body 4. A mixing hole 11 and a discharge hole 12 are respectively provided in the center of the end of the gun rod 3 in the mounting hole 6. The mixing hole 11 is located in the gun rod 3 at the same horizontal position as the anti-shooting unit 8. The anti-shooting unit 8 is connected to both sides of the mixing hole 11, and the discharge hole 12 is longitudinally connected to the mixing hole 11. An oil inlet 13 and an oil outlet 14 are respectively provided on one side of the oil cylinder 1. The oil inlet 13 is located at the upper end of the oil cylinder 1, and the oil outlet 14 is located at the lower end of the oil cylinder 1. When the piston 2 moves upward, the cleaning air hole 9 is closed. When the piston 2 moves downward, the cleaning air hole 9 is connected to the mixing hole 11.

[0023] The return unit 7 includes a return hole 71 and a return groove 72. The return holes 71 are symmetrically distributed on both sides of the gun rod placement hole 6, and the return groove 72 is symmetrically arranged on both sides of the gun rod 3 located in the gun rod placement hole 6. The return holes 71 and the return groove 72 are connected. When the piston 2 moves upward, the return groove 72 is connected to the return hole 71. When the piston 2 moves downward, the return groove 72 is connected to both the return hole 71 and the firing hole 81.

[0024] The through-fire unit 8 includes through-fire holes 81 symmetrically distributed on both sides of the gun barrel placement hole 6 and a pressure regulating valve 82. The pressure regulating valve 82 is connected to the through-fire holes 81. The back of the through-fire holes 81 is connected to the feed hole 10. The two sides of the mixing hole 11 are connected to the through-fire holes 81.

[0025] The stroke distance of piston 2 is equal to the longitudinal distance between return hole 71 and through hole 81, the longitudinal length of return groove 72, and the distance between through hole 81 and cleaning air hole.

[0026] This invention has two working states: liquid material circulation preparation state and mixed discharge state. The specific implementation process is as follows:

[0027] 1. Liquid material circulation preparation status:

[0028] Hydraulic oil enters through the inlet 13 at the upper end of cylinder 1, pushing piston 2 downwards. Hydraulic oil in the lower chamber of cylinder 1 flows out through the return port. The lower end of piston 2 stops contacting the upper surface of the gun head body 4. The gun rod 3, fastened to piston 2, moves with piston 2 to the lower dead center. The return groove 72 on the gun rod 3 aligns with the firing holes 81 on the lower end of the gun head body 4, while the upper end of the return groove 72 aligns with the return holes 71. At this time, materials A and B are respectively fed by the hydraulic feeding system through their respective pipelines to... The feed hole 10 on the gun head body 4 enters the return groove 72 of the gun rod 3 through the respective interconnected injection holes 81, and then flows back to the respective material tank through the respective interconnected return holes 71 into the pipelines connected to the two return holes 71, realizing liquid material circulation; at the same time, the two ends of the mixing hole 11 on the gun rod 3 are respectively aligned and connected to the cleaning air hole 9 at the bottom of the gun head body 4. Compressed air enters the cleaning air hole 9 through the air passage, and then simultaneously enters the mixing hole 11 and is ejected through the discharge hole 12 to clean the mixing hole 11;

[0029] 2. Mixed discharge state:

[0030] Hydraulic oil enters from the return port at the lower end of cylinder 1, pushing piston 2 upward. Hydraulic oil in the upper chamber of cylinder 1 flows out from inlet 13. The upper end of piston 2 contacts the inner bottom of cylinder 1 and stops. The gun rod 3, fastened to piston 2, moves with piston 2 to the top dead center. The two ends of the mixing hole 11 on the gun rod 3 are aligned with the firing holes 81 on the gun head body 4. At this time, materials A and B are respectively fed by the hydraulic feeding system through their respective pipelines to the feed holes 10 on the gun head body 4, and then enter the two ends of the mixing hole 11 on the gun rod 3 through their respective interconnected firing holes 81. Materials A and B collide and mix in the mixing hole 11. The mixed liquid of materials A and B then flows through the gun rod. The material is ejected from the discharge hole 12 at the center of the lower end of the gun 3. At this time, the pressure of the A and B materials can be adjusted by adjusting the pressure regulating valves 82 at the outer ends of the injection holes 81 to ensure the best mixing and spraying effect. Excess A and B materials are returned to their respective material tanks on the equipment through the return channels of the pressure regulating valves 82. When the equipment is used for spraying, the appropriate nozzle can be connected to the external threaded spray nozzle interface at the lower end of the gun rod 3 to make the mixture spray out a liquid flow or spray of appropriate shape. After the spraying is completed, it enters the aforementioned liquid circulation preparation state. A and B materials circulate along their respective pipelines. At the same time, two compressed air lines enter the cleaning air holes 9 to clean the mixing holes 11, completing one working cycle.

[0031] Therefore, the self-cleaning foam gun of this invention, which adopts the above-mentioned structure, effectively solves the problems of frequent gun head replacement and environmental pollution, and enables the foam gun to have self-cleaning and integrated spraying and pouring functions.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A self-cleaning foam gun, characterized in that: The device includes a hydraulic cylinder, a piston, a gun rod, and a gun head body. The piston is located inside the hydraulic cylinder. A lock nut is installed in a groove above the piston on the gun rod. The center of the piston is connected to one end of the gun rod through the piston and fixed by the lock nut. The center of the gun head body has a gun rod placement hole for placing the other end of the gun rod. The gun head body has a return unit, a firing unit, and a cleaning air hole arranged longitudinally. The firing unit is connected to a feed hole located on the back of the gun head body. A mixing hole and a discharge hole are respectively arranged in the center of the end of the gun rod in the gun rod placement hole. The mixing hole is located in the gun rod at the same horizontal position as the firing unit. The firing unit is connected to both sides of the mixing hole. The discharge hole is longitudinally connected to the mixing hole.

2. The self-cleaning foam gun according to claim 1, characterized in that: The material return unit includes a material return hole and a material return groove. The material return holes are symmetrically distributed on both sides of the gun rod placement hole, and the material return grooves are symmetrically arranged on both sides of the gun rod located in the gun rod placement hole. The material return holes are connected to the material return grooves.

3. The self-cleaning foam gun according to claim 2, characterized in that: The firing unit includes firing ports and a pressure regulating valve symmetrically distributed on both sides of the gun barrel placement hole. The pressure regulating valve is connected to the firing ports. The back of the firing ports is connected to the feed hole. The two sides of the mixing hole are connected to the firing ports.

4. A self-cleaning foam gun according to claim 3, characterized in that: When the piston moves upward, the return groove is connected to the return hole; when the piston moves downward, the return groove is connected to both the return hole and the through hole.

5. A self-cleaning foam gun according to claim 4, characterized in that: When the piston moves upward, the cleaning vent is closed; when the piston moves downward, the cleaning vent connects to the mixing vent.

6. A self-cleaning foam gun according to claim 5, characterized in that: The piston's stroke distance is equal to the longitudinal distance between the return hole and the through hole, the longitudinal length of the return groove, and the distance between the through hole and the cleaning air hole.

7. A self-cleaning foam gun according to claim 6, characterized in that: The oil cylinder has an oil inlet and an oil outlet on one side, with the oil inlet located at the upper end of the oil cylinder and the oil outlet located at the lower end of the oil cylinder.

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