Silicate modified polyurethane two-component spray gun

Abstract

The utility model discloses a silicate modified polyurethane two-component spray gun which comprises a spray gun switching mechanism, a feeding and discharging cleaning mechanism and a stirring and mixing mechanism, the spray gun switching mechanism comprises a fixed handle, a movable handle and a piston pull rod; the piston pull rod comprises a spring and a piston; the feeding and discharging cleaning mechanism comprises a feeding block and a discharging block; a material runner is arranged in the feeding block, a material runner and an air runner are arranged in the discharging block, and the feeding block is connected with the discharging block; the pull rod penetrates into a material runner of the feeding block from the outside of the feeding block, the piston is located in the material runner of the feeding block, and the spring is arranged between the piston and the end wall of the material runner in the feeding block; and the discharging block is connected with the stirring and mixing mechanism. The technology is a spray gun of a two-component rapid reaction material, the two-component material is fully mixed in the spray gun according to the proportion and then sprayed to a working face, the spray gun can be rapidly cleaned after operation is finished, and blockage is prevented; foaming spraying and non-foaming spraying of silicate modified polyurethane double components can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of spraying equipment, and relates to a special spray gun device for a pneumatic two-component spraying machine used in coal mines, specifically a silicate-modified polyurethane two-component spray gun, which is a multi-functional special spray gun capable of realizing the foaming spraying and non-foaming spraying of silicate-modified polyurethane two components. Background Art

[0002] In the operation of coal mine roadway driving, there are "fragmentation" problems in the processes of roadway surrounding rock sealing and air leakage plugging, which hinder the development of intelligent rapid driving technology and equipment. As the main solution, the spraying and plugging technology of spraying materials has the advantages of low cost, simple transportation and construction, and effective control of surrounding rock deformation.

[0003] However, common polyurethane spraying materials have defects such as large reaction heat, high cost, and easy pipe blockage. Although silicate-modified polyurethane has improved the reaction heat problem to a certain extent, its production process needs to meet the requirements of simplicity, high efficiency, high safety, and low cost. In practical applications, when traditional spray guns spray silicate-modified polyurethane two-component materials, there are problems such as uneven mixing, poor spraying effect, and material waste. In addition, the special two-component spraying spray guns on the market generally have disadvantages such as poor accuracy of mixing ratio, difficult cleaning, cumbersome operation, high price, strict requirements for operators, high maintenance cost, and limited application range. The aqueous phase of the silicate-modified polyurethane two-component spraying material is alkaline, with a density of 1.3 - 1.5 g / cm3; the oil phase is an isocyanate component, with a density of 1.1 - 1.3 g / cm3. Due to the physical property differences and rapid reaction characteristics of the aqueous phase and the oil phase, higher requirements are put forward for the performance of the spraying spray gun.

[0004] In order to meet the requirements of rapid mixing and reaction of the aqueous phase and oil phase two-component materials, it is necessary to invent a silicate-modified polyurethane two-component spray gun. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a silicate-modified polyurethane two-component spray gun aiming at the above-mentioned deficiencies of the prior art. The silicate-modified polyurethane two-component spray gun of the utility model enables the two-component materials to be fully mixed in the spray gun and then sprayed onto the working surface. After the operation is completed, the spray gun can be quickly cleaned to prevent blockage; this technology can realize the foaming spraying and non-foaming spraying of silicate-modified polyurethane two components; achieve rapid and uniform mixing, with good spraying effect; simple operation and low requirements for operators.

[0006] In order to achieve the above technical purpose, the technical solution adopted by the utility model is as follows:

[0007] A silicate-modified polyurethane two-component spray gun includes a spray gun switch mechanism, a feeding, discharging and cleaning mechanism, and a stirring and mixing mechanism;

[0008] The spray gun switch mechanism includes a fixed handle, a movable handle, and a piston pull rod; the movable handle is rotatably connected to the fixed handle, and the piston pull rod includes a spring and a piston fixedly connected to the pull rod; one end of the pull rod is connected to the movable handle; the fixed handle is connected to the feed block in the feeding and discharging and cleaning mechanism;

[0009] The feeding and discharging and cleaning mechanism includes a feed block and a discharge block; a material flow channel is provided in the feed block, and a material flow channel and an air flow channel are provided in the discharge block. The outlet of the material flow channel in the feed block is connected to the inlet of the material flow channel in the discharge block; the pull rod penetrates from the outside of the feed block into the material flow channel of the feed block, the piston is located in the material flow channel of the feed block, and the spring is provided between the piston and the end wall of the material flow channel in the feed block; the outlet of the air flow channel and the outlet of the material flow channel in the discharge block are both connected to the mixing agitator in the mixing mechanism.

[0010] As a further improved technical solution of the present invention, the mixing mechanism includes a mixing agitator and a nozzle. The mixing agitator is connected to the nozzle. The mixing agitator includes a mixer sleeve and a static mixer. The static mixer is located in the mixer sleeve and is composed of a plurality of left-handed blocks and right-handed blocks connected alternately.

[0011] As a further improved technical solution of the present invention, the feeding and discharging and cleaning mechanism further includes an A feed interface, a B feed interface, and an air inlet interface connected to the air flow channel inlet in the discharge block;

[0012] There are 2 material flow channels in the feed block, which are respectively denoted as A material flow channel 1 and B material flow channel 1; the inlet of A material flow channel 1 is connected to the A feed interface, and the inlet of B material flow channel 1 is connected to the B feed interface;

[0013] There are 2 material flow channels in the discharge block, which are respectively denoted as A material flow channel 2 and B material flow channel 2; the outlet of A material flow channel 1 is connected to the inlet of A material flow channel 2, and the outlet of B material flow channel 1 is connected to the inlet of B material flow channel 2;

[0014] There are 2 piston pull rods; the pull rods in the 2 piston pull rods are arranged in parallel, and one end of the pull rods in the 2 piston pull rods is simultaneously connected to the movable handle;

[0015] The pull rod in one piston pull rod penetrates from a reserved through hole on the front end face of the feed block into A material flow channel 1, the piston is located in A material flow channel 1, the spring is sleeved on the pull rod, and the spring is provided between the piston and the front end wall of A material flow channel 1;

[0016] The pull rod in the other piston pull rod penetrates from another reserved through hole on the front end face of the feed block into B material flow channel 1, the piston is located in B material flow channel 1, the spring is sleeved on the pull rod, and the spring is provided between the piston and the front end wall of B material flow channel 1.

[0017] As a further improved technical solution of the present utility model, a fixed rod is connected to the movable handle, and the threaded ends of the pull rods in the two piston pull rods are simultaneously locked and connected to the mounting holes on the fixed rod through nuts;

[0018] The feeding block and the discharging block are fixedly connected by bolts, and the outlet of the A material flow channel I of the feeding block is hermetically connected to the inlet of the A material flow channel II of the discharging block through a sealing ring, and the outlet of the B material flow channel I of the feeding block is hermetically connected to the inlet of the B material flow channel II of the discharging block through a sealing ring.

[0019] As a further improved technical solution of the present utility model, the A feeding interface and the B feeding interface have the same structure, and both include a feeding ball valve, a tee, a cleaning liquid ball valve and a feeding adapter. One end of the tee is threadedly connected to the feeding ball valve, the other end is threadedly connected to the cleaning liquid ball valve, and the other end is threadedly connected to the feeding block through the feeding adapter;

[0020] An A feeding port communicating with the inlet of the A material flow channel I and a B feeding port communicating with the inlet of the B material flow channel I are provided on the upper surface of the feeding block; the top of the piston in the A material flow channel I can block the inlet of the A material flow channel I when the spring is in a free state, so that the inlet of the A material flow channel I is not communicated with the A feeding port; the top of the piston in the B material flow channel I can block the inlet of the B material flow channel I when the spring is in a free state, so that the inlet of the B material flow channel I is not communicated with the B feeding port; the A feeding port is threadedly connected to the feeding adapter in the A feeding interface; the B feeding port is threadedly connected to the feeding adapter in the B feeding interface.

[0021] As a further improved technical solution of the present utility model, after the feeding block and the discharging block are fixedly connected, when the spring in the A material flow channel I is in a free state, the rear end of the piston in the A material flow channel I extends out of the outlet of the A material flow channel I and can block the inlet of the A material flow channel II of the discharging block;

[0022] After the feeding block and the discharging block are fixedly connected, when the spring in the B material flow channel I is in a free state, the rear end of the piston in the B material flow channel I extends out of the outlet of the B material flow channel I and can block the inlet of the B material flow channel II of the discharging block.

[0023] As a further improved technical solution of the present utility model, the air inlet interface includes an air inlet ball valve and an air inlet adapter, and the air inlet ball valve is threadedly connected to the air inlet adapter; an air inlet communicating with the air flow channel inlet is provided on the upper surface of the discharging block, and the air inlet adapter is threadedly connected to the air inlet of the discharging block.

[0024] As a further improved technical solution of the present utility model, the stirring and mixing mechanism includes a plurality of stirring mixers, and the mixer sleeves in the plurality of stirring mixers are sequentially connected through connecting pipes.

[0025] As a further improved technical solution of the utility model, the connecting pipe includes a male connecting pipe and a female connecting pipe;

[0026] The air flow channel outlet of the discharge block, the second outlet of the A material flow channel, and the second outlet of the B material flow channel are all located on the end face of the outlet end of the discharge block. The outlet end of the discharge block is threadedly connected to a female connecting pipe, and this female connecting pipe is threadedly connected to one end of the mixer sleeve in the first stirring mixer. The other end of the mixer sleeve in the first stirring mixer is threadedly connected to a male connecting pipe, and this male connecting pipe is threadedly connected to another female connecting pipe. Another female connecting pipe is threadedly connected to one end of the mixer sleeve in the second stirring mixer. The other end of the mixer sleeve in the second stirring mixer is threadedly connected to another male connecting pipe. Another male connecting pipe is threadedly connected to the nozzle cap, and the nozzle cap is connected to the nozzle.

[0027] As a further improved technical solution of the utility model, 2 drainage ribs are provided on the end face of the outlet end of the discharge block, and the 2 drainage ribs are respectively located between the second outlet of the A material flow channel and the air flow channel outlet and between the second outlet of the B material flow channel and the air flow channel outlet. Drainage ribs are added at the outlet, which are integrally formed by milling. The function of the drainage ribs is to delay the premature mixing reaction of the outlet materials, resulting in the problem of pipe blockage caused by material solidification.

[0028] As a further improved technical solution of the utility model, the nozzle is a fan-shaped nozzle or a conical nozzle.

[0029] As a further improved technical solution of the utility model, the feed ball valve in the A feed interface is connected to the liquid material A through a plunger pump, the feed ball valve in the B feed interface is connected to the liquid material B through another plunger pump, the intake ball valve in the air intake interface is connected to the air pressure source, the cleaning liquid ball valve in the A feed interface is connected to the cleaning liquid, and the cleaning liquid ball valve in the B feed interface is connected to the cleaning liquid;

[0030] The liquid material A is a silicate solution, and the liquid material B is a modified polyurethane solution.

[0031] When the two-component spray gun of the utility model sprays the foaming two-component AB material, the air pressure source of the air pipe is opened, and when it sprays the non-foaming two-component AB material, the air pressure source is closed.

[0032] The beneficial effects of the utility model are:

[0033] The two-component spray gun of the present utility model can, under the condition of the same formula, realize the foaming spraying and non-foaming spraying of silicate-modified polyurethane two-component through a unique design. Fully considering the physical property differences between the aqueous phase and the oil phase, rapid and uniform mixing is achieved. The air pressure source provides auxiliary power for the spraying process, and the air pressure and air flow can be adjusted according to the requirements of foaming or non-foaming. The spray head is optimized in design to achieve good atomization effect and ensure the spraying quality. The opening and closing of the inlet ball valve in the air inlet interface is the key to realizing the switching between foaming and non-foaming spraying. By adjusting parameters such as the liquid material flow rate (the feed ball valves in the A feed interface and the B feed interface can appropriately adjust the opening according to the liquid material flow rate, and the opening size controls the flow rate. The flow rate per unit time is different, and the ratio entering the mixing blender is different), the mixing ratio (the feed ball valves in the A feed interface and the B feed interface can appropriately adjust the opening according to the liquid material mixing ratio to meet the requirements of the liquid material mixing ratio), and the hydraulic pressure (the plunger pump can adjust the hydraulic pressure), different spraying requirements can be met. The cleaning structure is the key to achieving non-clogging of the gun and efficient, stable and continuous spraying.

[0034] The mixing blender in the two-component spray gun of the present utility model includes a mixer sleeve and a static mixer. The static mixer is located inside the mixer sleeve. The static mixer is composed of a plurality of left-handed blocks and right-handed blocks connected alternately. The left-handed blocks and right-handed blocks are connected alternately into an integral structure. The left-handed blocks and right-handed blocks have different rotation directions and both belong to the static mixer. The static mixer is integrally formed to fully mix the liquid materials, and the static mixer can be freely disassembled and cleaned. The mixer sleeve and the static mixer are resistant to high temperature and fire. A small amount of liquid material A and liquid material B will solidify and remain in the mixing blender during the mixing process. Liquid material A and liquid material B are non-metallic and not resistant to high temperature and fire. After the construction is completed, if the two-component AB material remaining in the mixing blender is not cleaned clean under the action of the cleaning liquid, it will adhere to the static mixer or the mixer sleeve. Putting the mixer sleeve and the static mixer together into a high-temperature furnace for baking or putting the static mixer alone into a high-temperature furnace for baking can make the cured two-component AB material break into powder, achieving the purpose of cleaning the mixer and prolonging the service life of the mixer.

[0035] The two-component spray gun of the present utility model can continuously convey the two-component material into the spray gun mixer. The rapid conveyance of the liquid materials is realized through the plunger pump, which can enable liquid material A and liquid material B to be rapidly mixed and react, and be sprayed onto the working surface before the material reaction and curing, and the spray gun pipeline can be cleaned in time to prevent pipe blockage. After the spraying is completed, quickly change the ball valve switches on the A feed interface and the B feed interface to make the cleaning liquid enter the spray gun pipeline and the mixer discharge the reaction liquid material, and the inlet ball valve of the air inlet interface can be opened to use air pressure purging to achieve the purpose of quickly cleaning the spray gun and preventing pipe blockage.

[0036] The two-component spray gun of the present utility model can appropriately adjust the mixing ratio of liquid materials according to the mixing effect of different materials. The opening sizes of the feed ball valves in the A feed interface and the B feed interface can be adjusted to meet the requirements of the liquid material mixing ratio. By increasing or shortening the number of mixing agitators or the distance between the mixing agitators, the mixing agitators are threadedly connected through male connecting pipes and female connecting pipes, which is convenient for free combination, disassembly and cleaning. The static mixer is directly inserted into the mixer sleeve, which is also convenient for the disassembly and cleaning of the static mixer.

[0037] The present utility model can freely match the length of the mixing agitators according to the mixing degree of the two-component materials. The mixing agitator is made of high-temperature resistant stainless steel material, which can withstand repeated high-temperature baking within 800 °C. If the mixer is blocked due to human operation factors, it can be placed in a high-temperature muffle furnace for baking to carbonize the blocked substances, thereby realizing the cleaning of the mixer.

[0038] The fixed handle, feed block and discharge block of the present utility model are connected by bolts and are all detachable components. Each pipeline (i.e., the mixing agitator) works independently, which is convenient for disassembly and replacement, and reduces the maintenance and use costs. An annular sealing ring is added at the joint between the feed block and the discharge block to prevent liquid leakage.

[0039] The present utility model is designed for a two-component rapid reaction material spray gun, which enables the two-component materials to be fully mixed in proportion in the spray gun and then sprayed onto the working surface. After the operation is completed, the spray gun can be quickly cleaned to prevent blockage. This technology can realize the foaming spraying and non-foaming spraying of silicate-modified polyurethane two components. The static mixer can quickly and evenly mix liquid material A and liquid material B, and the spraying effect is good; the structure is simple, the operation is simple, the requirements for operators are low, the disassembly and assembly are convenient, and the maintenance cost is low.

[0040] The second outlets of the A material flow path, the second outlets of the B material flow path and the air flow path outlet of the discharge block are arranged in parallel. The two sides are liquid outlets, and the middle is a gas outlet. Drainage ribs are also designed on the end face of the outlet end of the discharge block to prevent premature blockage of the outlet when the liquid material stops being transported.

[0041] The air pressure source of the present utility model can adopt an air compressor, which provides 0.4 MPa of gas for transportation. The liquid materials A and B are transported by a plunger pump. The air compressor provides air pressure to transport the cleaning liquid. The liquid materials A and B and the cleaning liquid can be stored in special storage tanks respectively.

[0042] In this utility model, liquid material A and liquid material B are silicate solution and modified polyurethane solution respectively. One is an oil-phase solution and the other is an aqueous-phase solution. The spray gun of this utility model is modified from a two-component AB material spray gun for rapid chemical reactions. The key point is to enable rapid cleaning to prevent pipe blockage. The mixing agitator has different lengths and can be freely combined. Also, the combined length is determined according to the reaction time of liquid material A and liquid material B. If the mixing agitator is too short, liquid material A and liquid material B may not be fully mixed, resulting in poor chemical reaction effect. If the mixing agitator is too long, liquid material A and liquid material B will solidify after the reaction and block the nozzle. This utility model can be rapidly cleaned with a cleaning liquid. Meanwhile, the air inlet can be opened to make the cleaning liquid contain bubbles, which is beneficial to the friction between the cleaning liquid and the mixing agitator. The function of adding gas can make the cleaning liquid form bubbles, making it easier to remove dirt. Description of the Drawings

[0043] Figure 1 Structural schematic diagram of a two-component spray gun for silicate-modified polyurethane Figure 1 。

[0044] Figure 2 Structural schematic diagram of a two-component spray gun for silicate-modified polyurethane Figure 2 。

[0045] Figure 3 Structural schematic diagram of a two-component spray gun for silicate-modified polyurethane Figure 3 。

[0046] Figure 4 Structural schematic diagram of a two-component spray gun for silicate-modified polyurethane Figure 4 。

[0047] Figure 5 Structural schematic diagram of a two-component spray gun for silicate-modified polyurethane after hiding the air inlet interface, A feed interface, and B feed interface.

[0048] Figure 6 Cross-sectional view of the A feed interface of a two-component spray gun for silicate-modified polyurethane

[0049] Figure 7 Cross-sectional view of the B feed interface of a two-component spray gun for silicate-modified polyurethane

[0050] Figure 8 Cross-sectional view of the air inlet interface and mixing agitator of a two-component spray gun for silicate-modified polyurethane

[0051] Figure 9 Cross-sectional view of the feed block, discharge block, and mixing agitator of a two-component spray gun for silicate-modified polyurethane

[0052] Figure 10 Structural schematic diagram of the discharge block of a two-component spray gun for silicate-modified polyurethane

[0053] Figure 11 It is a sectional view of the stirring mixer and the conical nozzle of a two-component spray gun of silicate-modified polyurethane.

[0054] Figure 12 It is a sectional view of the stirring mixer and the fan-shaped nozzle of a two-component spray gun of silicate-modified polyurethane.

[0055] Figure 13 It is a sectional view of the static mixer of a two-component spray gun of silicate-modified polyurethane. Specific embodiments

[0056] The following further describes the specific embodiments of the present invention with reference to the accompanying drawings:

[0057] A two-component spray gun of silicate-modified polyurethane includes a spray gun switch mechanism, a feeding, discharging and cleaning mechanism, and a stirring and mixing mechanism. The feeding, discharging and cleaning mechanism is made of aluminum alloy and is light in weight.

[0058] As Figures 1-4 shown, the spray gun switch mechanism includes a fixed handle 1, a movable handle 2 and a piston pull rod 6. The movable handle 2 is rotationally connected to the fixed handle 1 through a pin. A limit block 15 is fixedly connected to the fixed handle 1, and the limit block 15 is used to limit the displacement of the movable handle 2 moving towards the direction where the fixed handle 1 is located. As Figure 6 shown, the piston pull rod 6 includes a spring 602 and a piston 603 fixedly connected to a pull rod 601; one end of the pull rod 601 is connected to the movable handle 2; the fixed handle 1 is connected to a feeding block 7 in the feeding, discharging and cleaning mechanism through a bolt.

[0059] As Figures 1-4 shown, the feeding, discharging and cleaning mechanism includes a feeding block 7 and a discharging block 8; a material flow channel is provided in the feeding block 7, and a material flow channel and an air flow channel 804 are provided in the discharging block 8. The outlet of the material flow channel in the feeding block 7 is connected to the inlet of the material flow channel in the discharging block 8; the pull rod 601 penetrates from the outside of the feeding block 7 into the material flow channel of the feeding block 7, the piston 603 is located in the material flow channel of the feeding block 7, and the spring 602 is arranged between the piston 603 and the end wall of the material flow channel in the feeding block 7; the outlet of the air flow channel 804 and the outlet of the material flow channel in the discharging block 8 are both connected to a stirring mixer 11 in the stirring and mixing mechanism.

[0060] In this embodiment, the feeding, discharging and cleaning mechanism further includes an A feeding interface 3, a B feeding interface 4, and an air inlet interface 5 connected to the inlet of the air flow channel 804 in the discharging block 8.

[0061] There are 2 material flow channels in the feeding block 7, which are respectively denoted as an A material flow channel one 703 as Figure 6 shown and an Figure 7The shown first B material flow channel 704; The inlet of the first A material flow channel 703 is connected to the A feed interface 3, and the inlet of the first B material flow channel 704 is connected to the B feed interface 4.

[0062] There are 2 material flow channels in the discharge block 8, which are respectively recorded as Figure 6 the shown second A material flow channel 802 and Figure 7 the shown second B material flow channel 803; The outlet of the first A material flow channel 703 is connected to the inlet of the second A material flow channel 802, and the outlet of the first B material flow channel 704 is connected to the inlet of the second B material flow channel 803.

[0063] There are 2 piston pull rods 6; The pull rods 601 in the 2 piston pull rods 6 are arranged in parallel, and one end of the pull rods 601 in the 2 piston pull rods 6 is simultaneously connected to the movable handle 2.

[0064] As Figure 6 shown, the pull rod 601 in one piston pull rod 6 penetrates through a reserved through hole on the front end face of the feed block 7 into the first A material flow channel 703. The piston 603 is located in the first A material flow channel 703. The spring 602 is sleeved on the pull rod 601, and the spring 602 is arranged between the piston 603 and the front end wall of the first A material flow channel 703.

[0065] As Figure 7 shown, the pull rod 601 in the other piston pull rod 6 penetrates through another reserved through hole on the front end face of the feed block 7 into the first B material flow channel 704. The piston 603 is located in the first B material flow channel 704. The spring 602 is sleeved on the pull rod 601, and the spring 602 is arranged between the piston 603 and the front end wall of the first B material flow channel 704.

[0066] In this embodiment, a fixed rod 14 is connected to the movable handle 2, and the threaded ends of the pull rods 601 in the 2 piston pull rods 6 are simultaneously locked and connected to the mounting holes on the fixed rod 14 through nuts.

[0067] The feed block 7 and the discharge block 8 are fixedly connected by bolts, and the outlet of the first A material flow channel 703 of the feed block 7 and the inlet of the second A material flow channel 802 of the discharge block 8 are sealed and connected through a sealing ring. The outlet of the first B material flow channel 704 of the feed block 7 and the inlet of the second B material flow channel 803 of the discharge block 8 are sealed and connected through a sealing ring.

[0068] In this embodiment, the A feed interface 3 and the B feed interface 4 have the same structure. As Figure 2 shown, both include a feed ball valve 301, a tee 303, a cleaning liquid ball valve 302, and a feed adapter 304. One end of the tee 303 is threadedly connected to the feed ball valve 301, the other end is threadedly connected to the cleaning liquid ball valve 302, and the other end is threadedly connected to the feed block 7 through the feed adapter 304.

[0069] As shown Figure 5 in the figure, an A feed port 701 communicating with the inlet of the first A material flow channel 703 and a B feed port 702 communicating with the inlet of the first B material flow channel 704 are provided on the upper surface of the feed block 7; the top of the piston 603 in the first A material flow channel 703 can block the inlet of the first A material flow channel 703 in the free state of the spring 602, so that the inlet of the first A material flow channel 703 is not communicated with the A feed port 701; the top of the piston 603 in the first B material flow channel 704 can block the inlet of the first B material flow channel 704 in the free state of the spring 602, so that the inlet of the first B material flow channel 704 is not communicated with the B feed port 702; the A feed port 701 is threadedly connected to the feed adapter 304 in the A feed interface 3; the B feed port 702 is threadedly connected to the feed adapter 304 in the B feed interface 4.

[0070] In this embodiment, when the feed block 7 and the discharge block 8 are fixedly connected, as Figure 6 shown in the figure, in the free state of the spring 602 in the first A material flow channel 703, the rear end of the piston 603 in the first A material flow channel 703 extends out from the outlet of the first A material flow channel 703 and can block the inlet of the second A material flow channel 802 of the discharge block 8. As Figure 7 shown in the figure, when the feed block 7 and the discharge block 8 are fixedly connected, in the free state of the spring 602 in the first B material flow channel 704, the rear end of the piston 603 in the first B material flow channel 704 extends out from the outlet of the first B material flow channel 704 and can block the inlet of the second B material flow channel 803 of the discharge block 8.

[0071] In this embodiment, as Figure 8 shown in the figure, the air inlet interface 5 includes an air inlet ball valve 501 and an air inlet adapter 502, and the air inlet ball valve 501 is threadedly connected to the air inlet adapter 502; an air inlet 801 communicating with the inlet of the air flow channel 804 is provided on the upper surface of the discharge block 8, and the air inlet adapter 502 is threadedly connected to the air inlet 801 of the discharge block 8.

[0072] In this embodiment, the stirring and mixing mechanism includes a stirring mixer 11 and a nozzle 13, and the stirring mixer 11 is connected to the nozzle 13. As Figure 8 , Figure 9 , Figures 11-12 shown in the figure, the stirring mixer 11 includes a mixer sleeve 1101 and a static mixer 1102, and the static mixer 1102 is located inside the mixer sleeve 1101. As Figure 13 shown in the figure, the static mixer 1102 is composed of a plurality of left-handed blocks 11022 and right-handed blocks 11021 connected alternately, and the mixer sleeve 1101 is coaxially arranged with the static mixer 1102. The end 11023 is one end of the left-handed block 11022.

[0073] The stirring and mixing mechanism includes a plurality of stirring mixers 11, and the mixer sleeves 1101 in the plurality of stirring mixers 11 are sequentially connected through connecting pipes. The stirring mixers include two lengths of 110 mm and 200 mm, and the mixer lengths are freely matched according to the mixing effect of the two-component material. There are 3 matching methods (when the mixing property of the two-component material is good, only the shorter section is used; when the mixing property of the two-component material is average, the longer section is used; when the mixing property of the two-component material is poor, the short and long mixers are used in combination). The lengths for foaming and non-foaming are different, and the length is adjusted according to the actual situation.

[0074] In this embodiment, the connecting pipe includes a male connecting pipe 10 and a female connecting pipe 9.

[0075] As Figures 10-12 shown, the outlet of the air flow channel 804, the outlet of the A material flow channel two 802, and the outlet of the B material flow channel two 803 of the discharge block 8 are all located on the end face of the outlet end of the discharge block 8. The outlet end of the discharge block 8 is threadedly connected to a female connecting pipe 9, and this female connecting pipe 9 is threadedly connected to one end of the mixer sleeve 1101 in the first stirring mixer 11. The other end of the mixer sleeve 1101 in the first stirring mixer 11 is threadedly connected to a male connecting pipe 10, and this male connecting pipe 10 is threadedly connected to another female connecting pipe 9. Another female connecting pipe 9 is threadedly connected to one end of the mixer sleeve 1101 in the second stirring mixer 11. The other end of the mixer sleeve 1101 in the second stirring mixer 11 is threadedly connected to another male connecting pipe 10. Another male connecting pipe 10 is threadedly connected to the nozzle cover 12, and the nozzle cover 12 is connected to the nozzle 13.

[0076] In this embodiment, as Figure 10 shown, there are 2 drainage ribs 805 provided on the end face of the outlet end of the discharge block 8. The 2 drainage ribs 805 are respectively located between the outlet of the A material flow channel two 802 and the outlet of the air flow channel 804, and between the outlet of the B material flow channel two 803 and the outlet of the air flow channel 804. The drainage ribs 805 prevent the reaction from prematurely blocking the outlet when the liquid material stops being transported. The outlet of the A material flow channel two 802, the outlet of the air flow channel 804, and the outlet of the B material flow channel two 803 are parallel and do not interfere with each other.

[0077] In this embodiment, the nozzle 13 is a fan-shaped nozzle 13B as Figure 12 shown or a conical nozzle 13A as Figure 11 shown.

[0078] In this embodiment, as Figure 1As shown, the feed ball valve 301 in the A feed interface 3 is connected to the liquid material A through a plunger pump, the feed ball valve 301 in the B feed interface 4 is connected to the liquid material B through another plunger pump, the intake ball valve 501 in the intake interface 5 is connected to a pneumatic source, the cleaning liquid ball valve 302 in the A feed interface 3 is connected to the cleaning liquid, and the cleaning liquid ball valve 302 in the B feed interface 4 is connected to the cleaning liquid.

[0079] In this embodiment, the liquid material A is a silicate solution, and the liquid material B is a modified polyurethane solution.

[0080] The spray gun of this embodiment has the following innovative points:

[0081] 1. Achieve multiple spraying effects: Equipped with a precise pneumatic control system, it is applicable to various silicate-modified polyurethane two-component materials. By optimizing the structure and parameters, it can adapt to materials with different physical properties and mixing ratios, expanding the application range. It can switch between foaming and non-foaming spraying according to actual needs, ensuring construction quality and efficiency while increasing application flexibility. 2. Precise mixing system: A high-precision mixing device is designed to accurately control the mixing ratio of the aqueous phase and the oil phase according to the characteristics of the silicate-modified polyurethane two-component materials, ensuring the accuracy and uniformity of mixing, thereby improving the stability of the coating quality. 3. Anti-sticking technology: The mixer can carbonize the internal curing material through high-temperature baking to achieve the purpose of cleaning and reuse. 4. Self-cleaning and convenient cleaning structure: Through pneumatic circulation design, it can automatically or assist in cleaning the nozzle and pipeline when blocked, reducing blockage situations. Equipped with a safe discharge system to ensure that residual paint or pressure can be quickly and safely discharged during pipe blockage, creating conditions for cleaning and maintenance. At the same time, it adopts a structure design that is easy to disassemble and clean, facilitating operators to quickly and thoroughly clean the spray gun after use, effectively reducing material residue, reducing the risk of blockage, reducing maintenance costs and time. 5. Lightweight design: By selecting lightweight materials and optimizing the structure of the spray gun, the overall weight of the spray gun is reduced, reducing the labor intensity of operators, reducing production costs and maintenance costs. Through optimization design, the requirements for operators' professional knowledge and skills can be reduced, operation errors can be reduced, work efficiency and spraying quality can be improved, which is conducive to popularization and application. 6. The gun body (feeding and cleaning mechanism) is made of aluminum alloy material, with a smooth flow channel inside to reduce material resistance and ensure smooth material flow. The gun body (feeding and cleaning mechanism) is provided with a feeding interface and an air interface. 7. The feeding system includes two feeding pipes respectively connected to the A component and the B component of the silicate-modified polyurethane two-component materials. The feeding pipes are provided with feeding valves (ball valves) to accurately control the feeding ratio of the two materials. The mixer is located outside the gun body and can be directly connected to the gun body. It includes a static mixer with adjustable length, which can fully mix the aqueous phase and the oil phase materials. The structure of this mixer can generate strong turbulence, improving the mixing effect and ensuring that the two components fully react within seconds. 8. The spraying system includes a replaceable and easily detachable nozzle arranged at the rear end of the mixer. The nozzle is provided with an atomization device. The nozzle is made of stainless steel material. By replacing nozzles of different specifications and shapes, foaming and non-foaming of the product can be achieved. 9. The cleaning system sets a cleaning interface (i.e., cleaning ball valve) on the gun body, which can access the cleaning liquid. The cleaning liquid enters the inside of the spray gun through a specially designed cleaning channel to wash parts such as the mixing chamber and the nozzle, facilitating quick and thorough cleaning when the use is stopped.

[0082] Advantages of the spray gun in this embodiment:

[0083] By setting a static mixer with adjustable length, the two-component silicate-modified polyurethane material can be fully mixed in the mixing chamber, improving the mixing uniformity and thus ensuring the spraying quality. By using a nozzle with atomization function, the mixed material can be atomized into fine particles, improving the spraying effect and reducing material waste. It can meet the requirements of foaming and non-foaming of silicate-modified polyurethane spraying products, improving the construction quality and efficiency. There is a cleaning interface, namely a cleaning ball valve. This spray gun can achieve stable and efficient spraying, is not easy to clog, and is easy to clean.

[0084] Spraying operation: Connect all components tightly with threads or bolts without leakage. According to the requirements of the spraying material, adjust the ball valve of the feed interface and set the feeding ratio of the aqueous phase and oil phase materials. Open the material transfer pump and transfer the materials into the spray gun. Press the movable handle 2 of the spray gun, keep the distance and angle between the spray gun and the spraying surface appropriate, and perform the spraying operation.

[0085] Cleaning operation after stopping use: Stop the material transfer pump (such as a plunger pump), close the ball valve of the feed interface; Connect the cleaning liquid transfer pipeline to the cleaning ball valve interface of the spray gun; Open the cleaning liquid transfer pump (such as a pneumatic source or a plunger pump, etc.), so that the cleaning liquid can circulate inside the spray gun and rinse parts such as the mixing chamber and nozzle for no less than 5 minutes. Close the cleaning liquid transfer pump and remove the cleaning liquid transfer pipeline. Disassemble the spray gun, thoroughly clean each component, and remove the residual materials. After drying or wiping the cleaned components, assemble them for the next use.

[0086] The foaming spraying process of the above two-component spray gun for silicate-modified polyurethane specifically includes the following steps:

[0087] Step 1a: Connect the feed ball valve 301 in the A feed interface 3 to the liquid material A through a plunger pump and pipeline, and connect the feed ball valve 301 in the B feed interface 4 to the liquid material B through another plunger pump and pipeline; Connect the air inlet ball valve 501 in the air inlet interface 5 to the pneumatic source; Close the cleaning liquid ball valve 302 in the A feed interface 3 and the cleaning liquid ball valve 302 in the B feed interface 4;

[0088] Step 1b: Start the plunger pump and the plunger pump starts to work; Open the pneumatic source and the pneumatic source starts to generate and transfer gas;

[0089] Step 1c: Open the feed ball valve 301 in the A feed interface 3, the feed ball valve 301 in the B feed interface 4, and the air inlet ball valve 501 in the air inlet interface 5. The plunger pump transfers the liquid material A to the A feed port 701 of the feed block 7, and the plunger pump transfers the liquid material B to the B feed port 702 of the feed block 7; The pneumatic source transfers gas to the air inlet 801 and the air flow channel 804 of the discharge block 8;

[0090] Step 1d: Manually press the movable handle 2. Stop pressing when the movable handle 2 touches the limit block 15. At this time, the movable handle 2 pulls the two piston rods 6. The pistons 603 in the two piston rods 6 both move in the direction of the movable handle 2, compressing the springs 602. The pistons 603 in the two piston rods 6 simultaneously open the inlets of the A material flow channel 703 and the B material flow channel 704 of the feeding block 7. At this time, the liquid material A enters the A material flow channel 703 in the feeding block 7 through the A feeding port 701 of the feeding block 7, and then enters the A material flow channel 802 in the discharging block 8 through the A material flow channel 703. The liquid material B enters the B material flow channel 704 in the feeding block 7 through the B feeding port 702 of the feeding block 7, and enters the B material flow channel 803 in the discharging block 8 through the B material flow channel 704;

[0091] Step 1e: The liquid material A enters the stirrer 11 in the stirring and mixing mechanism through the outlet of the A material flow channel 802 in the discharging block 8, and the liquid material B enters the stirrer 11 in the stirring and mixing mechanism through the outlet of the B material flow channel 803 in the discharging block 8 at the same time. The gas enters the stirrer 11 in the stirring and mixing mechanism through the outlet of the air flow channel 804 in the discharging block 8. The gas, the liquid material A and the liquid material B are fully and quickly mixed under the action of the static mixer 1102 to form a mixed two-component AB material with bubbles, and finally the foamed two-component AB material is sprayed out through the conical nozzle 13A;

[0092] Step 1f: After the spraying is completed, release the movable handle 2. The movable handle 2 resets under the action of the spring 602, and the pistons 603 in the two piston rods 6 reset. The top of one piston 603 blocks the inlet of the A material flow channel 703 under the action of the spring 602, so that the inlet of the A material flow channel 703 is not communicated with the A feeding port 701; the top of the other piston 603 blocks the inlet of the B material flow channel 704 under the action of the spring 602, so that the inlet of the B material flow channel 704 is not communicated with the B feeding port 702, and the spray gun stops spraying;

[0093] Step 1g: Close the inlet ball valves 301 in the A feeding interface 3, the inlet ball valves 301 in the B feeding interface 4 and the inlet ball valve 501 in the air inlet interface 5; close the plunger pump and the air pressure source. The plunger pump and the air pressure source are both electric devices and are connected to a power supply. The air pressure source can adopt an air compressor. The ball valves in this embodiment are all manual ball valves.

[0094] The non-foaming spraying process of the above-mentioned silicate-modified polyurethane two-component spray gun specifically includes the following steps:

[0095] Step 2a: Connect the feed ball valve 301 in the A feed interface 3 to the liquid material A through a plunger pump and a pipeline; connect the feed ball valve 301 in the B feed interface 4 to the liquid material B through a plunger pump and a pipeline; close the intake ball valve 501 in the intake interface 5, the cleaning liquid ball valve 302 in the A feed interface 3, and the cleaning liquid ball valve 302 in the B feed interface 4.

[0096] Step 2b: Start the plunger pump, and the plunger pump starts to work.

[0097] Step 2c: Open the feed ball valve 301 in the A feed interface 3 and the feed ball valve 301 in the B feed interface 4. The plunger pump transports the liquid material A to the A feed port 701 of the feed block 7, and the plunger pump transports the liquid material B to the B feed port 702 of the feed block 7.

[0098] Step 2d: Manually press the movable handle 2. When the movable handle 2 touches the limit block 15, stop pressing. At this time, the movable handle 2 pulls the 2 piston rods 6, and the pistons 603 in the 2 piston rods 6 both move in the direction of the movable handle 2, compressing the spring 602. The pistons 603 in the 2 piston rods 6 simultaneously open the inlets of the A material flow channel 703 and the B material flow channel 704 of the feed block 7. At this time, the liquid material A enters the A material flow channel 703 through the A feed port 701 of the feed block 7, and then enters the A material flow channel 802 of the discharge block 8 through the A material flow channel 703. The liquid material B enters the B material flow channel 704 through the B feed port 702 of the feed block 7, and then enters the B material flow channel 803 of the discharge block 8 through the B material flow channel 704.

[0099] Step 2e: The liquid material A passes through the outlet of the A material flow channel 802 of the discharge block 8 and the liquid material B passes through the outlet of the B material flow channel 803 of the discharge block 8 and simultaneously enter the mixing blender 11 in the mixing mechanism. The liquid material A and the liquid material B are fully and quickly mixed under the action of the static mixer 1102 to form a mixed two-component AB material, and finally the non-foaming two-component AB material is sprayed out through the fan-shaped nozzle 13B.

[0100] Step 2f: After spraying, release the movable handle 2. The movable handle 2 resets under the action of the spring 602, and the pistons 603 in the 2 piston rods 6 reset. The top of one piston 603 blocks the inlet of the A material flow channel 703 under the action of the spring 602, so that the inlet of the A material flow channel 703 is not connected to the A feed port 701; the top of the other piston 603 blocks the inlet of the B material flow channel 704 under the action of the spring 602, so that the inlet of the B material flow channel 704 is not connected to the B feed port 702, and the spray gun stops spraying.

[0101] Step 2g: Close the feed ball valve 301 in the A feed interface 3 and the feed ball valve 301 in the B feed interface 4; turn off the plunger pump.

[0102] The cleaning process of the above-mentioned silicate-modified polyurethane two-component spray gun specifically includes the following steps:

[0103] Step 3a: Connect the inlet ball valve 501 in the air inlet interface 5 to a pneumatic source. The cleaning liquid ball valve 302 in the A feed interface 3 is connected to the cleaning liquid through a pipeline, and the cleaning liquid ball valve 302 in the B feed interface 4 is connected to the cleaning liquid through a pipeline. Close the feed ball valve 301 in the A feed interface 3 and the feed ball valve 301 in the B feed interface 4;

[0104] Step 3b: Turn on the pneumatic source, and the pneumatic source starts to generate and convey gas;

[0105] Step 3c: Open the inlet ball valve 501 in the air inlet interface 5, the cleaning liquid ball valve 302 in the A feed interface 3, and the cleaning liquid ball valve 302 in the B feed interface 4. The pneumatic source conveys gas to the air inlet 801 and the air flow channel 804 of the discharge block 8. The pneumatic source also conveys the cleaning liquid to the A feed port 701 of the feed block 7 by pneumatic means, and the pneumatic source also conveys the cleaning liquid to the B feed port 702 of the feed block 7 by pneumatic means;

[0106] Step 3d: Manually press the movable handle 2. When the movable handle 2 touches the limit block 15, stop pressing. At this time, the movable handle 2 pulls the 2 piston pull rods 6, and the pistons 603 in the 2 piston pull rods 6 both move in the direction of the movable handle 2, compressing the spring 602. The pistons 603 in the 2 piston pull rods 6 simultaneously open the inlets of the A material flow channel 703 and the B material flow channel 704 of the feed block 7. At this time, the cleaning liquid will enter the A material flow channel 703 through the A feed port 701 of the feed block 7, and then enter the A material flow channel 802 of the discharge block 8 through the A material flow channel 703. The cleaning liquid will enter the B material flow channel 704 through the B feed port 702 of the feed block 7, and then enter the B material flow channel 803 of the discharge block 8 through the B material flow channel 704;

[0107] Step 3e: The cleaning liquid exits through the A material flow channel 802 of the discharge block 8, the cleaning liquid exits through the B material flow channel 803 of the discharge block 8, and the gas exits through the air flow channel 804 of the discharge block 8 and enters the stirrer 11 in the stirring and mixing mechanism together. The cleaning liquid and the gas are mixed to generate bubbles in the cleaning liquid. The cleaning liquid with bubbles generates friction on the stirrer 11 during the conveying process, thereby fully cleaning the internal structure of the stirrer 11. The cleaning liquid with bubbles is finally sprayed out through the fan-shaped nozzle 13B or the conical nozzle 13A; achieving rapid cleaning of the feed block 7, the discharge block 8, and the stirring and mixing mechanism;

[0108] Step 3f: After the cleaning is completed, release the movable handle 2. The movable handle 2 resets under the action of the spring 602, and the pistons 603 in the two piston rods 6 reset. The piston 603 at the top of one piston blocks the inlet of the first A material flow channel 703 under the action of the spring 602, so that the inlet of the first A material flow channel 703 is not communicated with the A feed port 701; the piston 603 at the top of the other piston blocks the inlet of the first B material flow channel 704 under the action of the spring 602, so that the inlet of the first B material flow channel 704 is not communicated with the B feed port 702, and the spray gun stops cleaning;

[0109] Step 3g: Close the inlet ball valve 501 in the air inlet interface 5, the cleaning liquid ball valve 302 in the A feed interface 3, and the cleaning liquid ball valve 302 in the B feed interface 4; close the air pressure source.

[0110] In step 3f, the cleaning liquid sprayed through the sector nozzle 13B or the conical nozzle 13A can be transported through the pipeline to the liquid storage tank for storing the cleaning liquid, so as to realize recycling.

[0111] After the spray gun of this embodiment completes the spraying operation, the ball valve of the feed interface can be quickly switched to stop the transportation of the liquid material and inject the cleaning liquid into the mixer, so as to achieve rapid cleaning and prevent pipe blockage. The air inlet interface of this embodiment can be opened and closed as needed to realize the foaming spraying and non-foaming spraying of the two-component silicate-modified polyurethane. The movable handle 2 of the spray gun can control the feeding of the plunger pump, that is, press the movable handle 2, the piston opens the inlet of the material flow channel, and the plunger pump feeds the material. Release the movable handle 2, the piston blocks the inlet of the material flow channel, and the plunger pump stops feeding and enters the standby state.

[0112] Operation process: The opening and closing of the movable handle of the spray gun control the entry and exit of the two-component material. According to the material mixing ratio, adjust the ball valve to reach the required material mixing ratio. According to the actual mixing degree of the two-component material, adjust the length of the mixer. The conical nozzle makes the liquid material evenly spray onto the working surface. The sector nozzle is used when the nozzle performs non-foaming spraying, and the conical nozzle is used when the nozzle performs foaming spraying. The nozzle is connected by threads and can be freely disassembled and replaced. The nozzle is optimized in design to achieve a good atomization effect and ensure the spraying quality. The feeding and discharging cleaning mechanism includes an air inlet interface and two feed interfaces, which do not interfere with each other. The feeding and discharging cleaning mechanism can respectively transport the water-phase and oil-phase materials to the mixer to ensure the mixing of the two materials in proportion. The air inlet can provide auxiliary power during the spraying process and can adjust the air pressure and air flow according to the requirements of foaming or non-foaming. The stirring mixer 11 is made of high-temperature resistant stainless steel material, which can withstand repeated high-temperature baking within 800 °C. If the mixer is blocked due to human operation factors, it can be placed in a high-temperature muffle furnace for baking to carbonize the blocked substances, thereby realizing the cleaning of the mixer.

[0113] In the present utility model, the cleaning liquid is an inert liquid, such as a plasticizer (i.e., it does not react with isocyanate nor with sodium silicate). After cleaning, the mixing blender can be simply purged with a pneumatic source without the need for drying. After each construction, the mixing blender does not need to be disassembled, but the nozzle needs to be disassembled. Before the next use, it is necessary to check whether there are impurities inside the nozzle before installation. When constructing and using in the same environment and temperature, the foaming mixing blender has one more section (using 2 or 3 sections) than the non-foaming mixing blender. At the same time, the nozzle for foaming needs to be changed to a conical shape; the length of the mixing mechanism of the non-foaming one is small, that is, the number of sections of the mixing blender is small (1 or 2 sections), and the nozzle for non-foaming should be a fan-shaped nozzle. The present utility model is equipped with a safety discharge system, that is, when the two-component liquid material spraying is completed, the ball valve on the direct air inlet interface is opened to purge the inside of the mixing blender and discharge impurities. The present utility model has three forms of impurity discharge: 1. Purging with a pneumatic source, 2. Cleaning with the cleaning liquid, 3. Cleaning with the cleaning liquid and purging the cleaning liquid with a pneumatic source. The feeding and discharging cleaning mechanism of the present utility model has a smooth flow channel inside. The flow channel inside the mixer sleeve 1101 outside the static mixer 1102 is smooth, and the surface roughness Ra is above 0.8, to avoid the situation that there is remaining material in the equipment exactly at the concave and convex places due to the rough surface.

[0114] The content not elaborated in detail in this technology are all conventional technical means in the prior art.

[0115] The protection scope of the present utility model includes but is not limited to the above embodiments. The protection scope of the present utility model is subject to the claims. Any replacement, deformation, and improvement that are easily conceivable by those skilled in the art to this technology fall within the protection scope of the present utility model.

Claims

1. A silicate-modified polyurethane two-component spray gun, characterized in that: It includes a spray gun switch mechanism, a material inlet and outlet cleaning mechanism, and a stirring and mixing mechanism; The spray gun switch mechanism comprises a fixed handle (1), a movable handle (2) and a piston pull rod (6); the movable handle (2) is rotatably connected to the fixed handle (1), and the piston pull rod (6) comprises a spring (602) and a piston (603) fixedly connected to the pull rod (601); one end of the pull rod (601) is connected to the movable handle (2); the fixed handle (1) is connected to a feed block (7) in the feed and discharge cleaning mechanism; The inlet and outlet cleaning mechanism comprises a feed block (7) and a discharge block (8); a material flow channel is provided in the feed block (7), a material flow channel and an air flow channel (804) are provided in the discharge block (8), and the material flow channel outlet in the feed block (7) is connected to the material flow channel inlet in the discharge block (8); a pull rod (601) extends from the outside of the feed block (7) into the material flow channel of the feed block (7), a piston (603) is located in the material flow channel of the feed block (7), and a spring (602) is provided between the piston (603) and the end wall of the material flow channel in the feed block (7); the air flow channel (804) outlet and the material flow channel outlet in the discharge block (8) are both connected to the stirring mixer (11) in the stirring and mixing mechanism.

2. The silicate-modified polyurethane two-component spray gun according to claim 1, characterized in that: The stirring and mixing mechanism comprises a stirring mixer (11) and a nozzle (13); the stirring mixer (11) is connected to the nozzle (13); the stirring mixer (11) comprises a mixer sleeve (1101) and a static mixer (1102); the static mixer (1102) is located in the mixer sleeve (1101); and the static mixer (1102) is composed of a plurality of left-handed blocks (11022) and right-handed blocks (11021) that are alternately connected.

3. The silicate-modified polyurethane two-component spray gun according to claim 1, characterized in that: The inlet and outlet cleaning mechanism further comprises an A feed interface (3), a B feed interface (4), and an air inlet interface (5) connected to the inlet of the air flow channel (804) in the outlet block (8); There are two material flow channels in the feed block (7), which are respectively denoted as A material flow channel 1 (703) and B material flow channel 1 (704); the inlet of A material flow channel 1 (703) is connected to the A feed interface (3), and the inlet of B material flow channel 1 (704) is connected to the B feed interface (4); There are two material flow channels in the discharge block (8), which are respectively marked as material flow channel A 2 (802) and material flow channel B 2 (803); the outlet of material flow channel A 1 (703) is connected to the inlet of material flow channel A 2 (802), and the outlet of material flow channel B 1 (704) is connected to the inlet of material flow channel B 2 (803); There are two piston pull rods (6); the pull rods (601) in the two piston pull rods (6) are arranged in parallel, and one end of the pull rods (601) in the two piston pull rods (6) is simultaneously connected to the movable handle (2); A pull rod (601) in a piston pull rod (6) passes through a reserved through hole on the front end surface of the feed block (7) into the A material flow channel 1 (703), the piston (603) is located in the A material flow channel 1 (703), the spring (602) is sleeved on the pull rod (601), and the spring (602) is arranged between the piston (603) and the front end wall of the A material flow channel 1 (703); The pull rod (601) in the other piston pull rod (6) passes through another reserved through hole on the front end surface of the feed block (7) to the B material flow channel 1 (704), the piston (603) is located in the B material flow channel 1 (704), the spring (602) is sleeved on the pull rod (601), and the spring (602) is arranged between the piston (603) and the front end wall of the B material flow channel 1 (704).

4. The silicate-modified polyurethane two-component spray gun according to claim 3, characterized in that: The movable handle (2) is connected to a fixed rod (14), and the threaded ends of the pull rods (601) in the two piston pull rods (6) are simultaneously locked and connected to the mounting holes on the fixed rod (14) through nuts; The feed block (7) and the discharge block (8) are fixedly connected by bolts, and the outlet of the A material flow channel 1 (703) of the feed block (7) and the inlet of the A material flow channel 2 (802) of the discharge block (8) are sealed by a sealing ring, and the outlet of the B material flow channel 1 (704) of the feed block (7) and the inlet of the B material flow channel 2 (803) of the discharge block (8) are sealed by a sealing ring.

5. The silicate-modified polyurethane two-component spray gun according to claim 3, characterized in that: The A feed interface (3) and the B feed interface (4) have the same structure, both comprising a feed ball valve (301), a tee (303), a cleaning liquid ball valve (302) and a feed adapter (304); one end of the tee (303) is threadedly connected to the feed ball valve (301), the other end is threadedly connected to the cleaning liquid ball valve (302), and the other end is threadedly connected to the feed block (7) via the feed adapter (304); The upper surface of the feed block (7) is provided with an A feed port (701) connected to the inlet of the A material flow channel 1 (703) and a B feed port (702) connected to the inlet of the B material flow channel 1 (704); the top of the piston (603) in the A material flow channel 1 (703) can block the inlet of the A material flow channel 1 (703) when the spring (602) is in a free state, so that the inlet of the A material flow channel 1 (703) is not connected to the A feed port (701); The top of the piston (603) in the B material flow channel 1 (704) can block the inlet of the B material flow channel 1 (704) when the spring (602) is in a free state, thereby disconnecting the inlet of the B material flow channel 1 (704) from the B feed port (702); the A feed port (701) is threadedly connected to the feed adapter (304) in the A feed interface (3); and the B feed port (702) is threadedly connected to the feed adapter (304) in the B feed interface (4).

6. The silicate-modified polyurethane two-component spray gun according to claim 5, characterized in that: When the feed block (7) and the discharge block (8) are fixedly connected, when the spring (602) in the A material flow channel 1 (703) is in a free state, the rear end of the piston (603) in the A material flow channel 1 (703) extends from the outlet of the A material flow channel 1 (703) and can block the inlet of the A material flow channel 2 (802) of the discharge block (8); When the feed block (7) and the discharge block (8) are fixedly connected, when the spring (602) in the B material flow channel 1 (704) is in a free state, the rear end of the piston (603) in the B material flow channel 1 (704) extends out from the outlet of the B material flow channel 1 (704) and can block the inlet of the B material flow channel 2 (803) of the discharge block (8).

7. The silicate-modified polyurethane two-component spray gun according to claim 5, characterized in that: The air inlet interface (5) comprises an air inlet ball valve (501) and an air inlet adapter (502), the air inlet ball valve (501) being threadedly connected to the air inlet adapter (502); an air inlet (801) communicating with an inlet of an air flow channel (804) is formed on the upper surface of the discharge block (8), and the air inlet adapter (502) is threadedly connected to the air inlet (801) of the discharge block (8).

8. The silicate-modified polyurethane two-component spray gun according to claim 1, characterized in that: The stirring and mixing mechanism comprises a plurality of stirring mixers (11), and the mixer sleeves (1101) in the plurality of stirring mixers (11) are connected in sequence via connecting pipes.

9. The silicate-modified polyurethane two-component spray gun according to claim 8, characterized in that: The connecting pipe comprises a male connecting pipe (10) and a female connecting pipe (9); The outlet of the air flow channel (804), the outlet of the second material flow channel (802) of the material A and the outlet of the second material flow channel (803) of the material B are all located on the end surface of the outlet end of the material discharge block (8). The outlet end of the material discharge block (8) is threadedly connected to a female connecting pipe (9), and the female connecting pipe (9) is threadedly connected to one end of a mixer sleeve (1101) in the first stirring mixer (11). The other end of the mixer sleeve (1101) in the first stirring mixer (11) is connected to a male connector. The tube (10) is threadedly connected and the male connecting tube (10) is threadedly connected to another female connecting tube (9), the other female connecting tube (9) is threadedly connected to one end of a mixer sleeve (1101) in a second stirring mixer (11), the other end of the mixer sleeve (1101) in the second stirring mixer (11) is threadedly connected to another male connecting tube (10), the other male connecting tube (10) is threadedly connected to a nozzle cover (12), and the nozzle cover (12) is connected to the nozzle (13).

10. The silicate-modified polyurethane two-component spray gun according to claim 9, characterized in that: Two drainage ribs (805) are provided on the end surface of the outlet end of the discharge block (8), and the two drainage ribs (805) are respectively located between the outlet of the second A material flow channel (802) and the outlet of the air flow channel (804), and between the outlet of the second B material flow channel (803) and the outlet of the air flow channel (804).

11. The silicate-modified polyurethane two-component spray gun according to claim 2, characterized in that: The nozzle (13) is a fan-shaped nozzle (13B) or a conical nozzle (13A).

12. The silicate-modified polyurethane two-component spray gun according to claim 7, characterized in that: The feed ball valve (301) in the A feed interface (3) is connected to liquid material A via a plunger pump, the feed ball valve (301) in the B feed interface (4) is connected to liquid material B via another plunger pump, the feed ball valve (501) in the air feed interface (5) is connected to an air pressure source, the cleaning liquid ball valve (302) in the A feed interface (3) is connected to cleaning liquid, and the cleaning liquid ball valve (302) in the B feed interface (4) is connected to cleaning liquid; The liquid material A is a silicate solution, and the liquid material B is a modified polyurethane solution.

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