Mixing valve for polyurea waterproof coating AB liquid double-pipe mixing spray gun

Abstract

The invention relates to the technical field of mixing valves, in particular to a mixing valve for a polyurea waterproof coating AB liquid double-pipe mixing spray gun. According to the technical scheme, aiming at the problem that matching control is difficult due to mutual interference of two paths of liquid inlet pressure of a traditional T-shaped three-way valve, an anti-pressure-interference connecting part is arranged between a liquid inlet pipe and a connecting valve, and the anti-pressure-interference connecting part utilizes a working mode that an elastic pipe is controlled to extrude and convey materials and the materials are discharged through a one-way valve; and complete isolation of double-path pressure is realized. The high-efficiency mixing characteristic of the T-shaped structure is maintained, meanwhile, the pressure coupling phenomenon is thoroughly eliminated, the accuracy and stability of AB liquid proportion adjustment are remarkably improved, and the spraying quality and the operation reliability are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of mixing valve technology, and in particular to a mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid. Background Technology

[0002] In the high-pressure spraying technology of two-component polyurea waterproof coating (AB liquid), the core component for achieving instantaneous and uniform mixing of materials is the mixing valve located at the front end of the spray gun. Currently, a common basic structure in this field involves connecting two pipelines conveying materials A and B at a 180° angle through a traditional "T"-type three-way valve. The mixing mechanism primarily relies on the head-on collision of two high-pressure liquid streams within the valve chamber, utilizing the resulting intense turbulence to achieve initial mixing of the materials.

[0003] However, this simple "T"-shaped symmetrical structure has an inherent technical drawback: it constitutes a highly coupled pressure system. In this structure, the mixing chamber acts as a shared pressure field, causing the fluid pressures in the two input pipes to be closely related and mutually influential. In actual operation, when the opening of the regulating valve on either pipe is changed to adjust the ratio, not only will the flow rate and pressure in that pipe be changed, but the pressure balance within the mixing chamber will also be instantly disturbed, and this disturbance will be directly transmitted to the other pipe.

[0004] This mutual interference of pressures poses a significant challenge to the precise control of the system. It inevitably causes fluctuations in the pressure of component B when the operator adjusts the flow rate of component A, and vice versa, making the final pressure and flow balance difficult to achieve and extremely unstable. This problem forces the equipment to rely on highly precise pressure regulation mechanisms and skilled operation to barely maintain a stable mixing ratio, severely limiting the reliability and reproducibility of the spraying process. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background art by proposing a mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid, which structurally decouples two input pressures, eliminates mutual interference between them, and improves the performance of such mixing valves.

[0006] The technical solution of the present invention: a mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid, comprising: Two inlet pipes, a connecting valve connected to the two inlet pipes, a static mixer fixedly mounted on the connecting valve, a hose fixedly mounted on the static mixer, and a spray gun fixedly mounted on the other end of the hose; A pressure gauge, a regulating valve, and a flow meter are sequentially fixedly installed on the inlet pipe. Two pressure interference prevention connection components are provided, which connect the inlet pipe and the connecting valve. Each pressure interference prevention connection component includes a connecting box and a one-way pressure transmission module installed inside the connecting box. The one-way pressure transmission module includes an elastic tube fixedly installed inside the connecting box and a compression component for compressing the elastic tube. A one-way valve is fixedly installed on the connecting box and is connected to the connecting valve and the elastic tube.

[0007] Optionally, the extrusion assembly includes two rotating shafts rotatably mounted inside the connecting box, two sliding sleeves fixedly mounted on the rotating shafts, a sliding rod slidably mounted inside the sliding sleeves, and a spring fixedly mounted between the sliding rod and the sliding sleeves, with an extrusion wheel rotatably mounted at one end of the sliding rod.

[0008] Optionally, the two rotating shafts and two pairs of sliding sleeves located inside the same connecting box are symmetrical and parallel, and the two pairs of sliding sleeves located on the same rotating shaft are kept in a coaxial position.

[0009] Optionally, a linkage component is installed on the connecting box, which drives multiple rotating shafts to rotate synchronously and causes two rotating shafts located inside the same connecting box to rotate in opposite directions.

[0010] Optionally, the linkage component includes a first gear rotatably mounted on a connecting box, the first gear being coaxially and fixedly connected to one of the rotating shafts inside the connecting box, a second gear rotatably mounted on the connecting box and meshing with the first gear, a first transmission belt mounted on the connecting box, one pulley of the first transmission belt being coaxially and fixedly connected to another of the rotating shafts inside the connecting box, and the other pulley of the first transmission belt being coaxially and fixedly connected to the second gear.

[0011] Optionally, a second transmission belt is installed on two connecting boxes located on the same anti-pressure interference connecting component, and the two pulleys of the second transmission belt are respectively coaxially and fixedly connected to one of the pulleys on the first transmission belt on the two connecting boxes.

[0012] Optionally, the two coaxially arranged rotating shafts on the two anti-pressure interference connecting components are fixedly connected by a transmission shaft, and a power source is fixedly installed on one of the connecting boxes. The power source includes an output shaft that outputs power, and the output shaft is coaxially fixedly connected to one of the rotating shafts.

[0013] Optionally, the power source is either an electric motor or a pneumatic motor.

[0014] Optionally, one end of the elastic tube is connected to an output tube that is fixedly connected to the connecting box. An electrically controlled valve is fixedly installed on the output tube. The two output tubes are connected to a connector, which is fixedly connected to the inlet tube.

[0015] Optionally, an on / off valve is fixedly installed at the connection between the static mixer and the hose.

[0016] In summary, this application includes at least one of the following beneficial technical effects: This application, through a unique design of anti-pressure interference connection components, utilizes elastic tube volumetric conveying and one-way valve isolation to achieve complete decoupling of the pressure of the two inlet pipes, fundamentally eliminating the problem of ratio fluctuation caused by mutual pressure interference. While retaining the advantages of efficient collision mixing of the T-type connection valve, it ensures the accuracy and stability of the ratio adjustment, effectively improves the molding quality and uniformity of the polyurea coating, and reduces the operational risk of blockage caused by pressure imbalance. Attached Figure Description

[0017] Figure 1 Schematic diagram of the mixing valve Figure 1 ; Figure 2 Schematic diagram of the mixing valve Figure 2 ; Figure 3 Schematic diagram of the connecting components to prevent pressure interference Figure 1 ; Figure 4 Schematic diagram of the connecting components to prevent pressure interference Figure 2 ; Figure 5 Schematic diagram of the connecting components to prevent pressure interference Figure 3 ; Figure 6 for Figure 2 A magnified view of a section at point A in the middle; Figure 7 for Figure 4 A magnified view of a section at point B in the middle; Figure 8 for Figure 5 A magnified view of a section at point C; Figure 9 This is a schematic diagram of the structure of a Y-shaped connection valve; Figure 10 This is a schematic diagram of a T-shaped connection valve.

[0018] Reference numerals: 1. Inlet pipe; 11. Pressure gauge; 12. Regulating valve; 13. Flow meter; 2. Connecting valve; 3. Static mixer; 31. On / off valve; 4. Hoses; 5. Spray gun; 6. Pressure interference prevention connection components; 61. Connecting box; 62. One-way pressure transmission module; 621. Elastic tube; 622. Rotating shaft; 623. Sliding sleeve; 624. Sliding rod; 625. Extrusion wheel; 626. Spring; 63. One-way valve; 64. Output pipe; 65. Electrically controlled valve; 66. Connector; 67. Linkage assembly; 671. First gear; 672. Second gear; 673. First transmission belt; 674. Second transmission belt; 675. Drive shaft; 7. Storage box. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] Example: Figure 1 and Figure 2 As shown, the present invention proposes a mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid, comprising two inlet pipes 1, a connecting valve 2 connected to the two inlet pipes 1, a static mixer 3 fixedly installed on the connecting valve 2, a hose 4 fixedly installed on the static mixer 3, and a spray gun 5 fixedly installed at the other end of the hose 4. The two components are conveyed under high pressure through the inlet pipes 1, and after initial mixing at the connecting valve 2, they enter the static mixer 3 to achieve microscopic uniformity, and are then flexibly transferred to the spray gun 5 through the hose 4, and finally atomized and covered on the substrate to form a continuous and dense waterproof coating.

[0021] One end of the spray gun 5 is fixedly equipped with a storage tank 7. The storage tank 7 is used to store the solution after it has been mixed by the static mixer 3, which can ensure that the solution sprayed by the spray gun 5 remains uniform and prevent the flow from interrupted.

[0022] Furthermore, a pressure gauge 11, a regulating valve 12, and a flow meter 13 are sequentially fixedly installed on the inlet pipe 1. An on / off valve 31 is fixedly installed at the connection between the static mixer 3 and the hose 4. The flow meter 13 provides the current flow rate of the liquid and is used in conjunction with the control system. The operation is performed through the regulating valve 12 to achieve the target. The pressure gauge 11 ensures that the system operates in a stable state, while the on / off valve 31 provides a safety guarantee at the end of the process. Together, they ensure the accuracy, stability, and reliability of the polyurea spraying operation. The flow rate can be adjusted by the regulating valve 12 to meet the requirements for adjusting the liquid ratio.

[0023] refer to Figure 9 If the connecting valve 2 is configured as a Y-shaped structure, this oblique arrangement will reduce the direct impact force between the two fluid streams and effectively reduce the pressure interference inside the two inlet pipes 1. However, it will reduce the initial mixing effect of the three-way valve itself. In this embodiment, the following is adopted: Figure 10The T-shaped structure in the middle, supplemented by the anti-pressure interference connection component 6, can ensure that the pressure inside the two liquid inlet pipes 1 will not interfere with each other, and can also ensure the initial mixing effect of the three-way valve itself.

[0024] like Figures 3 to 8 As shown, the mixing valve in this embodiment also includes two pressure interference prevention connection components 6. These components connect the inlet pipe 1 and the connecting valve 2. The pressure interference prevention connection components 6 can isolate the pressure inside the two inlet pipes 1, preventing mutual interference. Each pressure interference prevention connection component 6 includes a connecting box 61, and a one-way pressure transmission module 62 installed inside the connecting box 61. The one-way pressure transmission module 62 allows the pressure inside the two inlet pipes 1 to be independent. The one-way pressure transmission module 62 includes an elastic tube 621 fixedly installed inside the connecting box 61 and a compression assembly that compresses the elastic tube 621. The coating will enter the elastic tube 621 through the inlet pipe 1. 21, and expand the elastic tube 621. The degree of expansion of the elastic tube 621 depends on the flow rate inside the liquid inlet pipe 1. That is, by controlling the flow rate of the liquid inlet pipe 1, the mass of liquid entering the elastic tube 621 per unit time can be controlled. The liquid entering the elastic tube 621 is discharged by the squeezing component. A one-way valve 63 is fixedly installed on the connecting box 61. The liquid discharged from the elastic tube 621 by the squeezing component will be discharged through the one-way valve 63. The one-way valve 63 can prevent the liquid from flowing backward. Finally, the liquid discharged through the one-way valve 63 will enter the connecting valve 2 and finally be sprayed out by the spray gun 5. The one-way valve 63 is connected to the connecting valve 2 and the elastic tube 621.

[0025] Furthermore, one end of the elastic tube 621 is connected to an output tube 64 that is fixedly connected to the connecting box 61. An electrically controlled valve 65 is fixedly installed on the output tube 64. The two output tubes 64 are connected to a connector 66, which is fixedly connected to the inlet tube 1. The liquid passing through the inlet tube 1 will enter the connector 66 and then pass through the electrically controlled valve 65 and the output tube 64 in sequence into the elastic tube 621. In order to prevent the liquid inside the elastic tube 621 from being squeezed out and generating suction inside the inlet tube 1, the electrically controlled valve 65 is set. When the elastic tube 621 is squeezed, the electrically controlled valve 65 connected to it is closed, which can prevent the liquid inside the inlet tube 1 from being generated and ensure the accuracy of the ratio. The alternating liquid inlet and outlet of the two elastic tubes 621 can ensure the stability of the liquid output.

[0026] like Figure 5 and Figure 8As shown, in this embodiment, the extrusion assembly includes two rotating shafts 622 rotatably mounted inside the connecting box 61, two sliding sleeves 623 fixedly mounted on the rotating shafts 622, a sliding rod 624 slidably mounted inside the sliding sleeves 623, and a spring 626 fixedly mounted between the sliding rod 624 and the sliding sleeves 623. An extrusion wheel 625 is rotatably mounted on one end of the sliding rod 624. The sliding arrangement of the sliding rod 624, under the elastic force of the spring 626, allows the extrusion wheel 625 to flatten the elastic tube 621 when it comes into contact with it, and gradually pushes it along the elastic tube 621, so that the liquid inside the elastic tube 621 can be completely discharged.

[0027] It should be noted that the two rotating shafts 622 and the two pairs of sliding sleeves 623 located inside the same connecting box 61 are symmetrical and parallel, and the two sliding sleeves 623 on the same rotating shaft 622 are coaxial. This allows the extrusion rollers 625 on both sides of the elastic tube 621 to extrude the elastic tube 621 simultaneously. In addition, the sliding rods 624 inside the two connecting boxes 61 located inside the same anti-pressure interference connecting component 6 are vertically arranged, which can extrude the two elastic tubes 621 sequentially.

[0028] like Figure 3 and Figure 7 As shown, in this embodiment, a linkage component 67 is installed on the connecting box 61. The linkage component 67 drives multiple rotating shafts 622 to rotate synchronously, and causes two rotating shafts 622 located inside the same connecting box 61 to rotate in opposite directions. The opposite rotation of the two rotating shafts 622 inside the same connecting box 61 can compress the elastic tube 621 through the compression wheel 625. The linkage component 67 includes a first gear 671 rotatably mounted on the connecting box 61. The first gear 671 is coaxially and fixedly connected to one of the rotating shafts 622 inside the connecting box 61. A linkage component 671 is rotatably mounted on the connecting box 61. The first gear 671 meshes with the second gear 672. The rotation of the second gear 672 drives the first gear 671 to rotate. The rotation directions of the first gear 671 and the second gear 672 are opposite. A first transmission belt 673 is installed on the connecting box 61. One pulley of the first transmission belt 673 is coaxially and fixedly connected to another rotating shaft 622 inside the connecting box 61. The other pulley of the first transmission belt 673 is coaxially and fixedly connected to the second gear 672. The two rotating shafts 622 inside the same connecting box 61 can rotate simultaneously through the first transmission belt 673.

[0029] It is worth noting that a second transmission belt 674 is installed on two connecting boxes 61 located on the same anti-pressure interference connecting component 6. The two pulleys of the second transmission belt 674 are coaxially and fixedly connected to one of the pulleys on the first transmission belt 673 on the two connecting boxes 61. The four rotating shafts 622 in the same anti-pressure interference connecting component 6 can be rotated synchronously through the second transmission belt 674.

[0030] Two coaxially arranged rotating shafts 622 on the two anti-pressure interference connection components 6 are fixedly connected by a transmission shaft 675. The transmission shaft 675 connects the rotating shafts 622 inside the two anti-pressure interference connection components 6, allowing the rotating shafts 622 inside the two anti-pressure interference connection components 6 to rotate synchronously. A power source is fixedly installed on one of the connection boxes 61. The power source includes an output shaft that outputs power. The output shaft is coaxially fixedly connected to one of the rotating shafts 622. The power source can be either an electric motor or a pneumatic motor. By driving one of the rotating shafts 622 to rotate through the electric motor or pneumatic motor, multiple rotating shafts 622 can rotate synchronously through the transmission of the linkage component 67. Combined with the periodic opening and closing of multiple electrically controlled valves 65, the pressure inside the two liquid inlet pipes 1 can be prevented from interfering with each other, and the squeezing group can be prevented from having a suction effect on the inside of the liquid inlet pipe 1, ensuring the accuracy and adjustability of the AB liquid ratio.

[0031] Working principle: The material enters the elastic tube 621 through the inlet pipe 1, connector 66 and open electric control valve 65, causing it to expand. The power source drives the rotating shaft 622 to rotate, and through the linkage component 67, all rotating shafts 622 rotate synchronously in opposite directions. The extrusion wheel 625 presses the elastic tube 621 under the action of spring 626 and pushes it along it, extruding the material. At this time, the corresponding electric control valve 65 closes to prevent suction on the inlet pipe 1. The extruded material pushes open the one-way valve 63 and enters the connecting valve 2 for collision and mixing. After being fully mixed by the static mixer 3, it passes through the on / off valve 31 and hose 4, and is finally sprayed out by the spray gun 5.

[0032] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid, characterized in that, include: Two inlet pipes (1), a connecting valve (2) connected to the two inlet pipes (1), a static mixer (3) fixedly installed on the connecting valve (2), a hose (4) fixedly installed on the static mixer (3), and a spray gun (5) fixedly installed on the other end of the hose (4). A pressure gauge (11), a regulating valve (12), and a flow meter (13) are fixedly installed on the inlet pipe (1) in sequence. Two pressure interference prevention connection components (6) are provided. The pressure interference prevention connection components (6) connect the inlet pipe (1) and the connecting valve (2). The pressure interference prevention connection components (6) include a connecting box (61) and a one-way pressure transmission module (62) installed in the connecting box (61). The one-way pressure transmission module (62) includes an elastic tube (621) fixedly installed inside the connecting box (61) and a compression assembly for squeezing the elastic tube (621). A one-way valve (63) is fixedly installed on the connecting box (61). The one-way valve (63) is connected to the connecting valve (2) and the elastic tube (621).

2. The mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid according to claim 1, characterized in that, The extrusion assembly includes two rotating shafts (622) rotatably mounted inside the connecting box (61), two sliding sleeves (623) fixedly mounted on the rotating shafts (622), a sliding rod (624) slidably mounted inside the sliding sleeves (623), and a spring (626) fixedly mounted between the sliding rod (624) and the sliding sleeves (623). An extrusion wheel (625) is rotatably mounted at one end of the sliding rod (624).

3. The mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid according to claim 2, characterized in that, The two rotating shafts (622) and two pairs of sliding sleeves (623) located inside the same connecting box (61) are symmetrical and parallel, and the two sliding sleeves (623) located on the same rotating shaft (622) are coaxial.

4. The mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid according to claim 3, characterized in that, The connecting box (61) is equipped with a linkage component (67), which drives multiple rotating shafts (622) to rotate synchronously and causes two rotating shafts (622) located inside the same connecting box (61) to rotate in opposite directions.

5. A mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid according to claim 4, characterized in that, The linkage component (67) includes a first gear (671) rotatably mounted on a connecting box (61), the first gear (671) being coaxially and fixedly connected to one of the rotating shafts (622) inside the connecting box (61), a second gear (672) rotatably mounted on the connecting box (61) meshing with the first gear (671), a first transmission belt (673) mounted on the connecting box (61), one of the pulleys of the first transmission belt (673) being coaxially and fixedly connected to another of the rotating shafts (622) inside the connecting box (61), and the other pulley of the first transmission belt (673) being coaxially and fixedly connected to the second gear (672).

6. A mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid according to claim 5, characterized in that, A second transmission belt (674) is installed on two connecting boxes (61) located on the same anti-pressure interference connecting component (6). The two pulleys of the second transmission belt (674) are respectively coaxially and fixedly connected to one of the pulleys on the first transmission belt (673) on the two connecting boxes (61).

7. A mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid according to claim 6, characterized in that, Two coaxially arranged rotating shafts (622) on the two anti-pressure interference connection components (6) are fixedly connected by a transmission shaft (675). A power source is fixedly installed on one of the connection boxes (61). The power source includes an output shaft that outputs power. The output shaft is coaxially fixedly connected to one of the rotating shafts (622).

8. A mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid according to claim 7, characterized in that, The power source is either an electric motor or a pneumatic motor.

9. A mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid according to claim 8, characterized in that, One end of the elastic tube (621) is connected to an output tube (64) that is fixedly connected to the connecting box (61). An electric control valve (65) is fixedly installed on the output tube (64). The two output tubes (64) are connected to a connector (66), which is fixedly connected to the inlet tube (1).

10. A mixing valve for a dual-pipe mixing spray gun for polyurea waterproof coating AB liquid according to claim 9, characterized in that, An on / off valve (31) is fixedly installed at the connection between the static mixer (3) and the hose (4).

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