Real-time high-precision hybrid curing polyurethane spraying device and method

Abstract

The application discloses a kind of real-time high-precision mixed curing polyurethane spraying device and spraying method, including at least two sets of feeding system, and air compressor, cold dryer, air pipeline, spray gun, integrated control system;One set of two sets of feeding system is used for polyurethane material, and one set is used for curing agent material;The application adopts the collocation of electric flow control valve and overflow valve to realize the accurate control of polyurethane raw material flow and pressure, and the real-time feedback of raw material pressure and flow data in pipeline is realized by pressure sensor and mass flowmeter, and the temperature of raw material can be adjusted in real time from barrel to spray gun whole course, in addition, polyurethane mixed curing is designed outside gun body. Through the design of structure, the proportion of polyurethane raw material and curing agent can be controlled with high precision, and the mixed curing proportion is adjusted in real time, and the raw material temperature and curing time are adjusted quickly.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of surface technology and protection, and particularly relates to a real-time high-precision mixed curing polyurethane spraying device and method. BACKGROUND

[0002] Polyurethane material is a multifunctional organic polymer material, which is widely used in many industries. In the water conservancy industry, the elastic polyurethane wear-resistant and corrosion-resistant coating has great advantages in solving the problems of erosion, corrosion and cavitation of the core components of water conservancy machinery such as water turbines, water pumps and spiral casings. In practical applications, the performance of polyurethane coating is affected by many factors, such as the mixing ratio of polyurethane raw materials and curing agent, mixing and curing time, and raw material temperature during spraying. At present, the pressure and flow of polyurethane raw materials and curing agent in the pipeline are usually controlled by controlling the power or revolutions of the hydraulic pump. However, the working state of the hydraulic pump is a dynamic process with a delay in control and low precision. Moreover, when the hydraulic pump is working tired and worn, the ability to control the stable output of raw materials will be greatly reduced, resulting in unstable and uneven coating quality. Therefore, in order to solve the above problems, there is an urgent need for a device and process method that can accurately control the process parameters and provide real-time feedback and adjustment during construction. SUMMARY

[0003] To solve the above technical problems, the present application provides a polyurethane spraying device and process method that can accurately control the ratio of polyurethane raw materials and curing agent, provide real-time feedback and adjustment of the mixing and curing ratio, and quickly adjust the raw material temperature and curing time. The present application adopts the following technical solutions:

[0004] A real-time high-precision mixed curing polyurethane spraying device, comprising at least two sets of feeding systems, an air compressor, a cold dryer, an air pipeline, a spray gun and an integrated control system. One set of the two sets of feeding systems is used for polyurethane material, and the other set is used for curing agent. Each feeding system comprises a barrel, a discharge pipe and a return pipe. The bottom of the barrel is provided with a discharge hole, and the upper side is provided with a backflow inlet. The outer sides of the barrel, the discharge pipe and the return pipe are wrapped with heating tapes. One end of the discharge pipe is connected to the discharge hole, and the other end is connected to the spray gun. From the barrel to the spray gun, a stop valve, a filter, a hydraulic pump, an electric flow control valve and a mass flow meter are sequentially arranged on the discharge pipe. One end of the return pipe is connected to the backflow inlet, and the other end is connected to the discharge pipe between the hydraulic pump and the electric flow control valve. An overflow valve is arranged on the return pipe, and a pressure sensor is arranged between the overflow valve and the hydraulic pump. The hydraulic pump is driven by a motor. The air compressor is connected to the cold dryer, and then connected to the spray gun through the air pipeline. An air solenoid valve is arranged on the air pipeline.

[0005] The motor, electric flow control valve, overflow valve, air solenoid valve, pressure sensor, and mass flow meter are all connected to the integrated control system. The integrated control system adjusts the operating parameters of the motor and overflow valve in real time based on the feedback data from the pressure sensor, thereby precisely controlling the pressure of the discharge pipeline. At the same time, the integrated control system controls the parameters of the electric flow control valve in real time based on the feedback data from the mass flow meter, so that the flow rate of the raw material can be precisely adjusted and controlled.

[0006] In the above technical solution, the spray gun further includes a nozzle, an air cap, a gun handle, and a spray gun body; one end of the nozzle is fixedly connected to the spray gun body, and the other end is fixedly connected to the air cap. The spray gun body has at least two channels, each connected to a discharge pipe for conveying polyurethane material and curing agent material respectively. The two raw materials enter the nozzle through the channels. The nozzle is used to mix the polyurethane and curing agent. The air cap is a hollow structure with several holes drilled from the side leading to the hollow part of the shaft. The holes are connected to the air pipeline through air quick connectors. The material at the nozzle outlet is refined and the shape of the sprayed beam is changed by the collision of multiple compressed air beams.

[0007] Furthermore, the nozzle has two channels inside, one channel is connected to the polyurethane material and the other channel is connected to the curing agent material. The two channels continuously converge and separate within the nozzle, eventually converging at the nozzle outlet.

[0008] Furthermore, the gun handle is fixedly connected to the spray gun body. Two switches are designed on the gun handle: one switch controls the air solenoid valve, and the other switch controls the motor, thereby controlling the opening and closing of the hydraulic pump.

[0009] In one embodiment of the present invention:

[0010] The polyurethane and curing agent cylinders can be designed to be wider at the top and narrower at the bottom, allowing the polyurethane and curing agent raw materials to flow out under gravity. The cylinders can be made of materials with good thermal conductivity, durability, corrosion resistance, and wear resistance, such as aluminum alloy or stainless steel.

[0011] The heating band for the material cylinder can be heated by common electric heating methods, wrapped around the polyurethane material cylinder and the curing agent material cylinder, and can heat and keep them warm.

[0012] It may also be equipped with a polyurethane cylinder cover and a curing agent cylinder cover, which are respectively placed on the polyurethane cylinder and the curing agent cylinder. The cover has a vent and a handle. The cover and the cylinder can be pressed together by a clamping device on the side of the cylinder.

[0013] The polyurethane discharge pipe refers to the entire liquid pipeline that connects one end to the bottom outlet of the polyurethane cylinder and the other end to the spray gun. A hydraulic pump, an electric flow control valve, and a mass flow meter are installed in the middle of the polyurethane discharge pipeline.

[0014] The curing agent outlet pipe refers to one end connected to the bottom outlet of the curing agent cartridge, one end connected to the liquid pipe of the spray gun, and the middle of the curing agent outlet pipe equipped with a hydraulic pump, an electric flow control valve, and a mass flow meter.

[0015] The polyurethane return pipe and the curing agent return pipe refer to one end connected between the hydraulic pump and the electric flow control valve that controls the outlet flow, and one end connected to the liquid pipe of the return inlet on the side of the cartridge.

[0016] The raw material pipe heating band wraps the outlet pipe and the return pipe, which serves to heat and keep warm.

[0017] The hydraulic pump serves to extract polyurethane and curing agent raw materials from the cartridge.

[0018] The motor is connected to the hydraulic pump through a common coupling, and the motor drives the hydraulic pump to work.

[0019] The stop valve is installed between the outlet pipe between the cartridge and the hydraulic pump, which serves as an on-off switch for the outlet pipe.

[0020] The filter is installed between the stop valve and the hydraulic pump, which serves to filter out particulate impurities in the cartridge, purify the raw materials, and protect the hydraulic pump.

[0021] The electric flow control valve can be controlled by the integrated control system, which serves to control the flow of the outlet pipe.

[0022] The mass flow meter serves to monitor and display the raw material flow of the outlet pipe and feedback to the integrated control system.

[0023] The overflow valve is installed on the return pipe between the hydraulic pump and the return inlet, and the overflow pressure of the overflow valve can be adjusted by the integrated control system, which serves to stabilize the pressure in the outlet pipe.

[0024] The pressure sensor is installed between the overflow valve and the hydraulic pump, which serves to feedback the pressure data in the pipe to the integrated control system.

[0025] The air compressor and the cold dryer serve to provide dry compressed air at a certain pressure.

[0026] The air solenoid valve is installed in the air pipe between the spray gun and the air compressor, which serves to electrically control the on-off of the compressed air and is controlled by the integrated control system.

[0027] The integrated control system mainly controls the motor, the electric flow control valve, the overflow valve, the air electromagnetic valve, collects and displays pressure data of the pressure sensor and data of the mass flow meter.Further, the integrated control system can adjust working parameters of the motor and the overflow valve in real time according to feedback data of the pressure sensor, so that the pressure of the discharge pipeline is accurately controlled; meanwhile, the integrated control system controls parameters of the electric flow control valve in real time according to feedback data of the mass flow meter, so that the flow of the raw material can be accurately adjusted and controlled.

[0028] According to a specific example of the present application, the nozzle functions to mix polyurethane and curing agent, and the nozzle can be designed with a double helix staggered structure or other two interlaced structures. The double helix staggered structure refers to two channels distributed in the nozzle cavity in a helical and smooth manner, and the two channels converge, separate and then converge many times during the process from the nozzle inlet to the nozzle outlet. This structure allows the polyurethane and the curing agent to collide and mix many times in the nozzle cavity, thereby achieving good mixing effect. The design length of the nozzle and the internal staggered structure affect the mixing and curing time and effect of the polyurethane and the curing agent, and the optimal parameters can be determined through tests; the nozzle root is sealingly connected to the main body of the spray gun through threads, and the nozzle opening is threadedly connected to the air cap, facilitating disassembly and replacement.

[0029] According to a specific example of the present application, the air cap is a hollow structure, and several holes are drilled in the side to communicate with the hollow center, which can be connected to the compressed air pipe through an air quick connector. The air cap functions to collide multiple compressed air beams, which can finely spray the raw material and achieve good atomization effect. In addition, the hollow structure of the air cap is designed in a horn shape, which can change the size and shape of the spray beam of the atomized polyurethane, and can adapt to the selection of coating spraying of various parts.

[0030] According to a specific example of the present application, the gun handle is screw-connected to the main body of the spray gun, and two switches are designed on the gun handle, one of which controls the air electromagnetic valve, and the other controls the motor, thereby controlling the opening and closing of the hydraulic pump and the delivery of the raw material. The gun handle is designed to cope with some manual spraying scenarios, so that manual spraying is more convenient, faster and labor-saving. If manual spraying is not required, the spray gun can be fixed on a mechanical hand through positioning screw holes on the main body of the spray gun for automatic spraying. The air electromagnetic valve switch and the motor switch can be opened and closed through the button panel of the integrated control system, or can be controlled through the switches on the gun handle.

[0031] The present application also provides a real-time high-precision mixing and curing polyurethane spraying process method, which is realized based on the above device and includes the following steps.

[0032] 1) Add the polyurethane raw material and curing agent raw material into their respective barrels. At this time, close the shut-off valve and turn on the heating belt to heat. Set the temperature of the polyurethane barrel to 60-80 degrees Celsius and the temperature of the curing agent barrel to 30-50 degrees Celsius.

[0033] 2) Before opening the shut-off valve, first disassemble the filter to clean impurities, then open the shut-off valve, set the overflow pressure of the relief valve, set the value of the electric flow control valve, set the parameters of the air compressor, and turn on the air compressor and refrigerated dryer.

[0034] 3) Turn on the motor to drive the hydraulic pump to extract raw materials. Check whether there is raw material flowing back into the material cylinder at the return inlet. Check whether the pressure sensor and mass flow meter are working properly. Once material flows out of the spray gun nozzle, open the air solenoid valve to start spraying.

[0035] 4) The spraying trajectory adopts a "well" pattern, that is, it alternates between horizontal back-and-forth spraying and vertical back-and-forth spraying. During the spraying process, if there are multiple different surfaces to be sprayed and different parameters are required, the parameters of the electric flow control valve, the parameters of the overflow valve, and the pressure of the compressed air can be changed at any time. The electric flow control valve can be adjusted according to the data of the real-time mass flow meter, and the mixing and curing time can also be adjusted by quickly changing nozzles of different lengths.

[0036] 5) After all the spraying is completed, disconnect the spray gun from the discharge pipe, align the polyurethane material discharge pipe end and the curing agent material discharge pipe end with the corresponding recycling cylinders, and turn on the hydraulic pump to discharge the raw materials from the polyurethane material cylinder and the curing agent material cylinder.

[0037] 6) After all the raw materials are discharged, pour the special cleaning agent into the barrel, turn on the hydraulic pump, and make the cleaning agent circulate and clean in the whole circuit. After cleaning is completed, discharge the cleaning agent to prepare for the next spraying.

[0038] The beneficial effects of this invention are:

[0039] The application provides a polyurethane spraying device and process capable of high-precision control of the proportion of polyurethane raw materials and curing agents, real-time feedback adjustment of the mixing and curing proportion, rapid adjustment of the raw material temperature and curing time, and the like. Compared with the traditional existing polyurethane spraying device, the application abandons the traditional control of the flow and pressure of polyurethane raw materials by controlling a metering hydraulic pump, and innovatively adopts the combination of an electric flow control valve and an overflow valve to realize the accurate control of the flow and pressure of polyurethane raw materials, and the real-time feedback of the real pressure and flow data of the raw materials in the pipeline to the computer through a pressure sensor and a mass flow meter, so that the computer can real-time fine-tune the parameters of the electric flow control valve and the overflow valve, thereby real-time fine-tuning the flow and pressure of polyurethane raw materials. In addition, the hydraulic pump only bears the function of providing sufficient raw material conveying power, and when the hydraulic pump is fatigued or worn after long-time work, and the ability of providing raw materials fluctuates, the mixing proportion of polyurethane raw materials will not be affected. In addition, compared with the traditional mixing and curing method of polyurethane, i.e., mixing and curing in the main body of the spray gun, the application innovatively designs the mixing and curing of polyurethane outside the gun body, and combines the mixing and curing with the nozzle, which can be conveniently disassembled and replaced. Moreover, the mixing time of polyurethane can be determined by the length of the mixing and curing cavity and the flow rate of the raw materials, and compared with the traditional mixing in the spray gun, which only relies on the flow rate of the raw materials to determine the mixing time, the time selection of the mixing and curing of polyurethane of the application is wider, and can be suitable for various polyurethane spraying processes. The temperature of the polyurethane raw materials can be real-time adjusted from the barrel to the spray gun, the initial temperature before mixing of polyurethane is strictly controlled, the mixing quality of polyurethane is ensured, and the quality of the polyurethane coating is ensured.

[0040] In summary, the device of the application can accurately control the mixing proportion, the raw material temperature and the curing time in real time, is suitable for spraying various polyurethane raw materials, greatly improves the spraying efficiency, saves the spraying raw materials, uniformly discharges the materials, realizes the collision and atomization of multiple compressed air, ensures the uniformity of the coating, and is very suitable for complex construction conditions on site. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 A real-time high-precision mixing and curing polyurethane spraying device schematic diagram;

[0042] Figure 2 A nozzle structure schematic diagram;

[0043] Figure 3 An air cap structure schematic diagram;

[0044] 1-polyurethane cartridge cover, 2-polyurethane cartridge, 3-cartridge heating belt, 4-stop valve, 5-filter, 6-cold dryer, 7-air compressor, 8-polyurethane return pipe, 9-motor, 10-hydraulic pump, 11-overflow valve, 12-pressure sensor, 13-electric flow control valve, 14-mass flow meter, 15-polyurethane discharge pipe, 16-polyurethane pipeline heating belt, 17-curing agent return pipe, 18-curing agent discharge pipe, 19-curing agent pipeline heating belt, 20-spray gun body, 21-nozzle, 22-air cap, 23-spray gun handle, 24-air solenoid valve switch, 25-discharge switch, 26-compressed air pipeline, 27-curing agent cartridge, 28-curing agent cartridge cover, 29-air solenoid valve, 30-integrated control system. DETAILED DESCRIPTION

[0045] The purposes and effects of the present application will become more apparent from the following description of the present application in conjunction with the accompanying drawings and specific embodiments, and it should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0046] A real-time high-precision mixed curing polyurethane spraying device of the present application, as shown in the drawings, comprises at least two sets of feeding systems, an air compressor, a cold dryer, an air pipeline, a spray gun, and an integrated control system. Figure 1 The two sets of feeding systems are used for polyurethane material and curing agent material respectively.

[0047] The polyurethane cartridge 2 and the curing agent cartridge 27 have an overall trend of being large at the top and small at the bottom, with an outlet hole at the bottom and a reflux inlet on the upper side, and a pressing device on the side. The polyurethane raw material and the curing agent raw material can flow into the discharge pipeline under the action of gravity. The cartridge can be made of aluminum alloy or stainless steel, which has good heat conduction performance, is firm and durable, and is corrosion and wear resistant.

[0048] The cartridge heating belt 3 can adopt a common electric heating method and is wrapped around the polyurethane cartridge 2 and the curing agent cartridge 27 to heat and insulate them.

[0049] The polyurethane cartridge cover 1 and the curing agent cartridge cover 28 are respectively covered on the polyurethane cartridge 2 and the curing agent cartridge 27, and the cover has an exhaust port and a handle. The cover and the cartridge can be pressed by the pressing device on the side of the cartridge.

[0050] The polyurethane discharge pipe 15 is connected to the bottom outlet of the polyurethane cartridge 2 and the liquid pipeline of the spray gun body 20. The polyurethane discharge pipe 15 is provided with a hydraulic pump 10, an electric flow control valve 13, and a mass flow meter 14.

[0051] The curing agent outlet pipe 18 refers to one end of the curing agent tank 27 bottom outlet, one end of the liquid pipe connected to the spray gun body, the curing agent outlet pipe 18 is also equipped with the same hydraulic pump, electric flow control valve, mass flow meter as the polyurethane outlet pipe 15.

[0052] The polyurethane return pipe 8 and the curing agent return pipe 17 refer to one end connected between the hydraulic pump 10 and the electric flow control valve 13 for controlling the outlet flow, and one end connected to the liquid pipe of the return inlet on the side of the tank.

[0053] The polyurethane pipe heating belt 16 and the curing agent pipe heating belt 19 wrap the outlet pipe and the return pipe, which functions to heat and keep warm.

[0054] The motor 9 is connected with the hydraulic pump 10 through a common shaft coupling, the motor 9 drives the hydraulic pump 10 to work, and extracts the polyurethane and curing agent raw materials in the tank.

[0055] The stop valve 4 is installed between the two tanks and the outlet pipe of the hydraulic pump 10, which is a switch of the outlet pipe, and the filter 5 is installed between the stop valve 4 and the hydraulic pump 10, which functions to filter out particulate impurities in the tank, purify the raw materials, and protect the hydraulic pump 10.

[0056] The raw material electric flow control valve 13 is installed on the outlet pipe between the hydraulic pump 10 and the spray gun body 20, the opening degree of the raw material electric flow control valve 13 is controlled by the integrated control system 30, and the function is to control the flow of the outlet pipe. The mass flow meter 14 is installed on the outlet pipe between the electric flow control valve 13 and the spray gun body 20, which functions to monitor and display the raw material flow of the outlet pipe and feedback to the integrated control system.

[0057] The overflow valve 11 is installed on the return pipe between the hydraulic pump 10 and the return inlet, the overflow pressure of the overflow valve 11 can be adjusted by the integrated control system, and the function is to stabilize the pressure in the outlet pipe.

[0058] The pressure sensor 12 is installed between the overflow valve 11 and the hydraulic pump 10, which functions to feedback the pressure data in the pipe to the integrated control system.

[0059] The air compressor 7 and the cold dryer 6 function to provide dry compressed air with a certain pressure.

[0060] The air electromagnetic valve 29 is installed in the air pipe 26 between the air cap 22 and the cold dryer 6, which functions to electrically control the opening and closing of the compressed air and is controlled by the integrated control system 30.

[0061] The integrated control system 30 mainly controls the motor 9, the electric flow control valve 13, the overflow valve 11, the air electromagnetic valve 29, collects and displays the pressure data of the pressure sensor 12 and the data of the mass flow meter 14. According to the feedback data of the pressure sensor 12, the integrated control system 30 can adjust the working parameters of the motor 9 and the overflow valve 11 in real time, so as to accurately control the pressure of the discharge pipeline. At the same time, according to the feedback data of the mass flow meter 14, the integrated control system 30 can control the parameters of the electric flow control valve 13 in real time, so that the flow of the raw material can be accurately adjusted and controlled.

[0062] Referring to the drawings Figure 2 The nozzle 21 is used for mixing polyurethane and curing agent. The nozzle 21 is designed in a double helix staggered structure. One helix is distributed upwards around the axis of the nozzle 21 and divides the cavity in the nozzle 21 into a helical channel. Another helix is distributed in a staggered manner and divides the cavity in the nozzle 21 into another helical channel. The two helical channels intersect many times in the cavity of the nozzle 21. The polyurethane and the curing agent enter the two channels respectively, collide and mix many times in the cavity of the nozzle 21, so as to achieve good mixing effect. The design length and the helical structure of the nozzle 21 directly affect the mixing and curing time and effect of the polyurethane and the curing agent. The root of the nozzle 21 is connected to the main body 20 of the spray gun through a threaded sealing connection, and the nozzle port is connected to the air cap 22 through a threaded connection, so as to facilitate disassembly and replacement.

[0063] Referring to the drawings Figure 3 The air cap 22 is a hollow structure. Several holes are drilled in the side surface to the hollow part of the axis. The air cap 22 can be connected to the compressed air pipe 26 through an air quick connector. The air cap 22 is used for collision of multiple compressed air beams, so as to finely spray the raw material and achieve good atomization effect. In addition, the horn-shaped hollow structure of the air cap 22 can change the size and shape of the spray beam of the atomized polyurethane, so as to adapt to the selection of coating spraying of various parts, and facilitate disassembly and replacement.

[0064] The main body 20 of the spray gun has two channels for transmitting polyurethane raw material and curing agent raw material respectively. The two kinds of raw materials enter the nozzle 21 after passing through the channel outlets and are mixed and cured.

[0065] The spray gun handle 23 can be connected to the main body 20 of the spray gun through a screw. Two switches are designed on the spray gun handle 23. One switch is used for controlling the air electromagnetic valve 29, and the other switch is used for controlling the motor 9, so as to control the opening and closing of the hydraulic pump 10 and the conveying of the raw material. The design of the spray gun handle 23 makes the spraying process more convenient, faster and labor-saving. The switches of the air electromagnetic valve 29 and the motor 9 can also be opened and closed through the button of the operation panel of the integrated control system 30, or can be controlled through the switches on the spray gun handle 23.

[0066] The present invention provides a real-time, high-precision, mixed-curing polyurethane spraying process as follows:

[0067] 1) Add the polyurethane raw material and curing agent raw material into their respective barrels. At this time, the shut-off valve 4 is closed, and the barrel heating belt 3, the polyurethane pipeline heating belt 16 and the curing agent pipeline heating belt 19 are turned on for heating. The polyurethane barrel 2 can be set to a temperature of 60-80 degrees Celsius, and the curing agent barrel 27 can be set to a temperature of 30-50 degrees Celsius.

[0068] 2) Before opening the shut-off valve 4, first disassemble the filter 5 to clean impurities (if there are impurities), then open the shut-off valve 4, set the overflow pressure of the overflow valve 4, set the value of the flow control valve 13, set the parameters of the air compressor 7 to appropriate values, and turn on the air compressor 7 and the refrigerated dryer 6.

[0069] 3) Turn on the motor 9 to drive the hydraulic pump 10 to draw raw materials. Check if there is raw material flowing back into the barrel at the return port. Check if the pressure sensor 12 and the mass flow meter 14 are working properly. When the mixture flows out of the nozzle 21 outlet, open the air solenoid valve 29 to spray.

[0070] 4) The spraying trajectory is suitable for the "grid" pattern, that is, if the first coat is sprayed horizontally back and forth, the second coat is sprayed vertically back and forth, and so on.

[0071] During the spraying process, if multiple different surfaces need to be sprayed and different parameters are required, the parameters of the electric flow control valve 13, the overflow valve 4, and the compressed air pressure can be changed at any time. Furthermore, the electric flow control valve 13 will be adjusted according to the data from the real-time mass flow meter 14. The air solenoid valve 13 and the motor 9 can also be temporarily shut off, and then nozzles 21 of different lengths can be quickly replaced to adjust the mixing and curing time.

[0072] 5) After all the spraying is completed, disassemble the mixing and curing nozzle 21 of the spray gun, align the polyurethane outlet and the curing agent outlet with the corresponding recycling cylinders, and start the hydraulic pump to discharge and recycle the raw materials in the polyurethane cylinder and the curing agent cylinder.

[0073] 6) After all the raw materials are discharged, pour the special cleaning agent into the barrel, turn on motor 9 to make the cleaning agent circulate and clean in the whole circuit. After cleaning is completed, discharge the cleaning agent to prepare for the next spraying.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, or alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A real-time high-precision hybrid-cured polyurethane spraying device, characterized in that, The polyurethane material and the curing agent material are respectively added into the respective material barrels, at this time, the stop valve is closed, the heating belts are opened for heating, the polyurethane material barrel is set to a temperature of 60-80 degrees Celsius, and the curing agent material barrel is set to a temperature of 30-50 degrees Celsius. The nozzle is internally provided with two passages, one of which is connected with the polyurethane material, and the other of which is connected with the curing agent material, the two passages continuously intersect, separate, intersect and separate in the nozzle, and finally intersect at the nozzle outlet. The motor, the electric flow control valve, the overflow valve, the air electromagnetic valve, the pressure sensor and the mass flowmeter are connected with the integrated control system, the integrated control system adjusts the working parameters of the motor and the overflow valve in real time according to the feedback data of the pressure sensor, so that the pressure of the discharge pipe is accurately controlled, and at the same time, the integrated control system controls the parameters of the electric flow control valve in real time according to the feedback data of the mass flowmeter, so that the flow of the raw materials is accurately adjusted and controlled.

2. The real-time high-precision hybrid-cured polyurethane spray device according to claim 1, wherein, The gun handle is fixedly connected with the spray gun body, two switches are designed on the gun handle, one switch controls the air electromagnetic valve, and the other switch is used for controlling the motor, so as to control the opening and closing of the hydraulic pump.

3. The real-time high-precision hybrid-cured polyurethane spray device according to claim 1, wherein, The device is realized based on any one of claims 1-3, and includes the following steps:

4. A real-time high-precision hybrid-cured polyurethane spray method, characterized by, 1) polyurethane raw materials and curing agent raw materials are respectively added into the respective material barrels, at this time, the stop valve is closed, the heating belts are opened for heating, the polyurethane material barrel is set to a temperature of 60-80 degrees Celsius, and the curing agent material barrel is set to a temperature of 30-50 degrees Celsius; 2) before opening the stop valve, the filter is disassembled and impurities are cleaned, then the stop valve is opened, the overflow pressure of the overflow valve is set, the value of the electric flow control valve is set, the parameters of the air compressor are set, the air compressor and the cold dryer are opened; ​ 3) Turn on the motor to drive the hydraulic pump to extract raw materials, check whether there is raw material flowing back into the material cylinder at the return inlet, and whether the pressure sensor and mass flow meter are working properly. Once material flows out of the spray gun nozzle, open the air solenoid valve to start spraying. 4) The spraying trajectory adopts a "well" pattern, that is, it alternates between horizontal back-and-forth spraying and vertical back-and-forth spraying. During the spraying process, if there are multiple different surfaces to be sprayed and different parameters are required, the parameters of the electric flow control valve, the parameters of the overflow valve, and the pressure of the compressed air can be changed at any time. The electric flow control valve can be adjusted according to the data of the mass flow meter in real time, and the mixing and curing time can also be adjusted by quickly changing nozzles of different lengths. 5) After all the spraying is completed, disconnect the spray gun from the discharge pipe, align the polyurethane material discharge pipe end and the curing agent material discharge pipe end with the corresponding recycling cylinders, and turn on the hydraulic pump to discharge the raw materials from the polyurethane material cylinder and the curing agent material cylinder. 6) After all the raw materials are discharged, pour the special cleaning agent into the barrel, turn on the hydraulic pump, and make the cleaning agent circulate and clean in the whole circuit. After cleaning is completed, discharge the cleaning agent to prepare for the next spraying.

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