A marking device for road traffic planning

Abstract

The present invention discloses a road marking device for traffic planning, which relates to the technical field of road marking. The road marking device for traffic planning includes a nozzle tube, an air pipe and an injection pipe are provided on one side of the nozzle tube, which are used for air injection and injection respectively; a needle valve rod, the needle valve rod is located in the nozzle tube, and a blocking ball is provided at the lower end of the needle valve rod, which is used to block or not block the spray hole, a piston plate is fixed to the upper end of the needle valve rod, and a reset spring is provided between the piston plate and the top end of the nozzle tube. The injection pipe is cut off by a three-way valve, and the valve plate is lifted to open the pressure relief pipe, so that the air pressure inside the nozzle tube drops. The step-by-step drop in air pressure effectively eliminates the inertia of paint injection caused by the sudden drop in pressure. The reset spring and the air pressure difference work together to push the blocking ball to block the spray hole, forming a physical secondary seal, realizing a mechanical-pneumatic dual-drive seal, thereby reducing paint leakage and avoiding the accumulation of paint spots at the starting and ending ends of the marking due to a sudden increase or drop in pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of road markings, in particular to a road marking device for road traffic planning. Background Art

[0002] Traffic markings refer to signs on the road surface that use lines, arrows, text, facade markings, raised road signs and contour marks to convey traffic information such as guidance, restrictions, and warnings to traffic participants. Since road markings cover a relatively wide area, special road marking equipment is required for marking work.

[0003] The Chinese patent publication number CN118516900A discloses a road marking machine. The device uses three binding rings to bind multiple nozzles. The binding rings are arranged in an annular shape. The power assembly drives the nozzles to move in the annular binding rings. Since the three binding rings are arranged concentrically, the multiple nozzles can form straight lines of various angles in a plane, so that the required width of the marking line can be drawn, allowing the road marking machine to complete a wider line marking task in one marking operation.

[0004] However, in actual use, we found that due to unstable pressure at the beginning and end of the spray gun, such as at the moment of opening and closing, the sudden change in pressure causes excess paint to be sprayed out, resulting in paint spots accumulating at the starting and ending ends of the marking due to a sudden increase or decrease in pressure, which not only causes paint waste but also affects the quality of the marking. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a road marking device for road traffic planning, which solves the problem of paint residue at the starting and ending ends of the marking machine.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a road traffic planning marking device, including a nozzle tube, an air pipe and an injection tube are provided on one side of the nozzle tube, which are used for air injection and material injection respectively; a needle valve rod, the needle valve rod is located in the nozzle tube, and a blocking ball is provided at the lower end of the needle valve rod, which is used to block or not block the spray hole, a piston plate is fixed to the upper end of the needle valve rod, and a reset spring is provided between the piston plate and the top end of the nozzle tube; a three-way valve, the three-way valve is provided at one end of the injection tube, a pressure relief tube is provided between the air pipe and the three-way valve, a fixed valve plate and a movable valve plate are provided in the pressure relief tube, and when the three-way valve cuts off the injection tube, the movable valve plate can be lifted to open to relieve the pressure in the air pipe.

[0007] Furthermore, a venturi tube is provided at one end of the pressure relief pipe away from the trachea, an annular tube is provided outside the venturi tube, a thin tube is provided between the annular tube and the throat of the venturi tube, and the annular tube is connected to the three-way valve through a connecting tube.

[0008] Furthermore, the three-way valve has a valve core, and a lifting valve stem is fixedly provided at the upper end of the valve core, and the upper end of the lifting valve stem extends to the inside of the pressure relief pipe and is fixedly connected to the movable valve plate; when the movable valve plate moves to the lowermost end, the fixed valve plate is docked with the movable valve plate, and the paint input end of the three-way valve is connected to the injection pipe, and the connecting pipe is in a closed state; when the movable valve plate moves to the uppermost end, the fixed valve plate and the movable valve plate are misaligned, and the connecting pipe and the injection pipe are both in a semi-open state, and the paint input end of the three-way valve is in a fully open state.

[0009] Furthermore, the nozzle pipe is composed of three parts: a nozzle sleeve, a nozzle insert tube, and a nozzle guard. The upper end of the nozzle insert tube is inserted into the nozzle sleeve and connected to the nozzle sleeve through the second air inlet hole. The lower end of the nozzle insert tube is fixedly connected to the nozzle guard. A boss is provided on the nozzle insert tube, and an annular channel is opened inside the boss. The annular channel is connected with the injection pipe, and a feed channel is opened between the annular channel and the inner wall of the nozzle insert tube. The feed channel is inclined toward the upper end of the nozzle insert tube, and the annular channel is inclined toward the direction of the injection pipe.

[0010] Furthermore, an inner lining tube is installed inside the nozzle cannula, a conical cavity is provided in the inner lining tube, and a spiral groove is provided on the inner wall of the conical cavity.

[0011] Furthermore, the air pipe includes an air inlet pipe and a buffer chamber. One end of the buffer chamber is connected to the air inlet pipe, and the other end of the buffer chamber is connected to the nozzle sleeve through a first air inlet hole. The peripheral side of the buffer chamber is connected to the upper end of the pressure relief pipe.

[0012] Furthermore, a buffer balloon is fixed in the buffer chamber relative to the output end of the air intake pipe. The buffer balloon is made of elastic rubber and is filled with damping liquid. A guide plate is provided on the surface of the buffer balloon.

[0013] Furthermore, it also includes a side bracket, one end of which is fixed on the mobile carrier, and a guide slide rail is provided on one side of the side bracket; a mobile platform, which is provided on one side of the side bracket, and the mobile platform is slidably connected to the side bracket, and a mounting base for installing the nozzle pipe is fixed on the mobile platform.

[0014] Furthermore, a rack is installed on one side of the guide slide rail, and a through slot is opened on one side of the mobile platform. A gear meshing with the rack is rotatably installed in the through slot, and a servo motor for driving the gear rotation is fixed on the mobile platform; a mounting bracket is provided at one end of the side bracket, and a horizontal displacement sensor and a controller are installed on the mounting bracket. The horizontal displacement sensor is used to detect the horizontal speed of the side bracket perpendicular to the direction of the marking line, and feed back the detection result to the controller. The controller controls the operation of the servo motor to compensate for the horizontal speed of the mobile platform perpendicular to the direction of the marking line.

[0015] Furthermore, a fixed lifting ring is slidably mounted on the side bracket, and the fixed lifting ring is in the shape of an "8".

[0016] The present invention has the following beneficial effects:

[0017] (1) The marking equipment for road traffic planning cuts off the injection pipe through the three-way valve and lifts the valve plate to open the pressure relief pipe at the same time, so that the air pressure inside the nozzle pipe drops. The step-by-step drop in air pressure effectively eliminates the inertia of paint spraying caused by the sudden drop in pressure. The return spring and the pressure difference work together to push the blocking ball to block the spray hole, forming a physical secondary seal and realizing a mechanical-pneumatic dual-drive seal, thereby reducing paint leakage and avoiding the accumulation of paint spots at the starting and ending ends of the marking due to a sudden increase or drop in pressure.

[0018] (2) The marking equipment for road traffic planning can prevent paint leakage by setting the feed channel and the annular channel in an inclined manner, and can also facilitate the backflow of gas inside the nozzle tube into the injection tube, thereby improving the cleaning effect of the annular channel and the feed channel in the later stage. By setting the Venturi tube and utilizing the backflow of gas, the residual paint in the tube can be recycled, which not only saves paint but also avoids the paint solidifying in the tube, which makes the equipment maintenance more difficult.

[0019] (3) The marking equipment for road traffic planning uses the horizontal speed information perpendicular to the marking direction fed back by the horizontal displacement sensor to enable the controller to control the servo motor to work, and adjust the position of the mobile platform on the guide rail through the coordination of the gear and rack, thereby compensating for the horizontal displacement of the mobile carrier perpendicular to the marking direction, so that the mobile platform and the marking position are relatively stationary, eliminating the problems of marking distortion, wavy or broken lines caused by the shaking of the mobile carrier, and ensuring that the straightness of the marking meets the road construction standards.

[0020] (4) The road marking equipment used for traffic planning uses a conical spiral cavity to generate a greater rotational shear force, improve the atomization effect of the paint, and reduce the particle size of the paint.

[0021] (5) The road marking equipment used for traffic planning can absorb the high-frequency pressure fluctuations of the input high-pressure gas through the buffer balloon. Under the setting of the guide plate, it can guide the high-pressure gas after input, thereby reducing the sudden increase or decrease in pressure caused by air flow fluctuations and further improving the quality of the marking.

[0022] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 Schematic diagram of the installation structure of the mobile platform in the present invention;

[0025] Figure 3 For the present invention Figure 2 Another perspective of the picture;

[0026] Figure 4 Schematic diagram of the installation structure of the gear and rack in the present invention;

[0027] Figure 5 Schematic diagram of the internal structure of the nozzle sleeve in the present invention;

[0028] Figure 6 For the present invention Figure 5 Another perspective of the picture;

[0029] Figure 7 Schematic diagram of the internal structure of the nozzle pipe in the present invention;

[0030] Figure 8 For the present invention Figure 7 The main view;

[0031] Figure 9 This is a positional relationship diagram of the fixed valve plate and the movable valve plate in the present invention;

[0032] Figure 10 For the present invention Figure 9 The main view;

[0033] Figure 11 For the present invention Figure 10 Enlarged view of point A in the middle;

[0034] Figure 12 Schematic diagram of the connection structure of the three-way valve in the present invention.

[0035] In the figure, 1. mobile carrier; 2. hot melt spray material storage tank; 3. waste material recovery tank; 4. high-pressure air pump; 5. high-pressure pump; 6. side bracket; 7. mobile platform; 8. mounting base; 9. horizontal displacement sensor; 10. mounting frame; 11. guide rail; 12. rack; 13. servo motor; 14. gear; 15. fixed lifting ring; 16. air inlet pipe; 17. pressure relief pipe; 18. material delivery pipe; 19. three-way valve; 20. injection pipe; 21. connecting pipe; 22. nozzle sleeve; 23. nozzle cannula; 24. nozzle guard; 25. Boss; 26. Second air inlet hole; 27. First air inlet hole; 28. Needle valve stem; 29. ​​Cylinder body; 30. Piston plate; 31. Return spring; 32. Buffer chamber; 33. Buffer balloon; 34. Annular channel; 35. Feed channel; 36. Liner tube; 37. Conical cavity; 38. Spiral groove; 39. Ball plug; 40. Spray hole; 41. Venturi tube; 42. Annular tube; 43. Fixed valve plate; 44. Moving valve plate; 45. Lifting valve stem; 46. Valve core; 47. Connecting through hole; 48. Capillary tube; 49. Return pipe. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] See also Figure 1 - Figure 12 An embodiment of the present invention provides a technical solution: a road marking device for traffic planning, including a nozzle tube, an air pipe and an injection pipe 20 are provided on one side of the nozzle tube, which are respectively used for injecting air and material into the nozzle tube, wherein the air pipe is located at the outer side of the nozzle tube near the upper end, and the injection pipe 20 is located at the outer side of the nozzle tube near the lower end.

[0039] The road traffic planning marking equipment provided in this embodiment also includes a needle valve rod 28, which is located in the nozzle tube, and a blocking ball 39 is provided at the lower end of the needle valve rod 28 for blocking or not blocking the spray hole 40. Preferably, a self-cleaning coating is provided on the surface of the blocking ball 39 to reduce paint adhesion, and the maximum diameter of the blocking ball 39 is larger than the inner diameter of the spray hole 40 to avoid the blocking ball 39 from being completely sunk into the spray hole 40. A piston plate 30 is fixed to the upper end of the needle valve rod 28, and a reset spring 31 is provided between the piston plate 30 and the top end of the nozzle tube. The reset spring 31 is mainly used to drive the piston plate 30 to reset, so that the needle valve rod 28 drives the blocking ball 39 to move toward the spray hole 40.

[0040] In addition, the road traffic planning marking equipment provided in this embodiment also includes a three-way valve 19, which is arranged at one end of the injection pipe 20, and a pressure relief pipe 17 is provided between the air pipe and the three-way valve 19. The pressure relief pipe 17 has a fixed valve plate 43 and a movable valve plate 44. When the three-way valve 19 cuts off the injection pipe 20, it can lift the movable valve plate 44, so that the pressure relief pipe 17 is opened, the air pipe is depressurized, and the air pressure in the injection nozzle pipe is reduced, and the reset spring 31 is further relaxed, thereby pushing the piston plate 30 to move. It should be noted that a cylinder body 29 is installed at the top of the nozzle pipe, and the reset spring 31 is provided between the top of the cylinder body 29 and the piston plate 30, and the inner wall of the cylinder body 29 is slidably connected to the piston plate 30, and a limit ring is provided at the lower end of the cylinder body 29 to prevent the piston plate 30 from excessive movement.

[0041] In this solution, the injection pipe 20 is cut off by the three-way valve 19, so that the paint input end is cut off, thereby avoiding continuous input of paint from the source and preventing paint leakage. At this time, the three-way valve 19 lifts the valve plate 44, so that the pressure relief pipe 17 is opened, thereby realizing air pipe pressure relief, and further reducing the air pressure injected into the nozzle pipe. Under the pressure difference on both sides of the piston plate 30 and the relaxation effect of the return spring 31, the piston plate 30 is pushed to move, and then the needle valve rod 28 drives the blocking ball 39 to move toward the spray hole 40 until the blocking ball 39 blocks the spray hole 40, so as to achieve secondary leak prevention and effectively avoid the accumulation of paint spots at the starting and ending ends of the marking line due to a sudden increase or decrease in pressure.

[0042] like Figure 12 As shown, a venturi tube 41 is provided at one end of the pressure relief pipe 17 away from the trachea, an annular tube 42 is provided on the outside of the venturi tube 41, a thin tube 48 is provided between the annular tube 42 and the throat of the venturi tube 41, and the annular tube 42 is connected to the three-way valve 19 through a connecting pipe 21. It should be noted that a return pipe 49 is installed at the other end of the venturi tube 41, and a waste recovery tank 3 is provided at the end of the return pipe 49 on the mobile carrier 1 for recycling the paint in the pipe, which not only saves the paint, but also avoids the paint solidifying in the pipe, which makes the equipment maintenance more difficult.

[0043] It should be noted that when the airflow flows through the venturi tube 41, due to its special structural design, the airflow enters smoothly at the inlet section and gradually accelerates in the contraction section. During this process, the cross-sectional area continues to decrease. According to the continuity equation, the volume of airflow flowing through each cross-sectional area at the same time is equal, so the flow rate increases. According to the Bernoulli equation, the kinetic energy of the airflow increases, and the potential energy and pressure energy decrease accordingly, so that the flow rate reaches the maximum at the throat and the pressure drops to the minimum. This creates a pressure difference between the inlet and throat of the venturi tube 41. The greater the fluid flow rate, the higher the degree of acceleration in the contraction section, the greater the flow rate at the throat, the lower the pressure, and the greater the pressure difference generated, so that the throat of the venturi tube 41 absorbs the paint inside the capillary 48, thereby preventing the paint from solidifying in the tube and achieving paint recovery.

[0044] like Figure 9 - Figure 11 As shown, in order to realize the linkage between the three-way valve 19 and the movable valve plate 44, the three-way valve 19 provided in this embodiment has a valve core 46, and a lifting valve stem 45 is fixedly provided on the upper end of the valve core 46. The upper end of the lifting valve stem 45 extends to the inside of the pressure relief pipe 17 and is fixedly connected to the movable valve plate 44. Preferably, the lifting valve stem 45 is driven by an external electric telescopic cylinder or an air cylinder. This driving method is relatively common and will not be described in detail in this embodiment. Preferably, the valve core 46 is a sleeve-type structure, and a connecting through hole 47 is opened on the outside of the valve core 46. The connecting through hole 47 is adapted to the inlet end of the injection pipe 20 for connecting the feed end of the three-way valve 19 with the injection pipe 20.

[0045] Specifically, when the movable valve plate 44 moves to the lowermost end, the fixed valve plate 43 is docked with the movable valve plate 44, the pressure relief pipe 17 is closed, and the gas is completely injected into the nozzle tube. The air pressure inside the nozzle tube increases, and under the action of the air pressure difference on both sides of the piston plate 30, the piston plate 30 is pushed to move, and then the needle valve rod 28 drives the blocking ball 39 to move away from the spray hole 40, thereby opening the spray hole 40. At the same time, the paint input end of the three-way valve 19 is connected to the injection pipe 20, and the connecting pipe 21 is in a closed state, thereby realizing the injection of paint. When the movable valve plate 44 moves to the uppermost end, the fixed valve plate 43 is misaligned with the movable valve plate 44, and the pressure relief pipe 17 is opened, so that the air pressure injected into the nozzle tube decreases. Under the action of the pressure difference and the relaxation of the return spring 31, the piston plate 30 is pushed to move, and then the needle valve stem 28 drives the blocking ball 39 to move toward the spray hole 40 until the blocking ball 39 blocks the spray hole 40, so as to achieve secondary leakage prevention of the paint, and effectively avoid the accumulation of paint spots at the starting and ending ends of the marking line due to a sudden increase or decrease in pressure. At the same time, the connecting pipe 21 and the injection pipe 20 are both in a semi-open state, and the paint input end of the three-way valve 19 is in a fully open state. The gas inside the nozzle pipe passes through the injection pipe 20, which can be used to clean the internal paint of the injection pipe 20. It should be noted that mutually matching stepped grooves or beveled edges can be provided at the connection between the movable valve plate 44 and the fixed valve plate 43, and a sealing gasket can be installed at the connection to improve the sealing effect.

[0046] like Figure 6 - Figure 9 As shown, the nozzle pipe provided in this embodiment consists of three parts: a nozzle sleeve 22, a nozzle insert tube 23, and a nozzle guard 24. The upper end of the nozzle insert tube 23 is inserted into the nozzle sleeve 22 and is connected to the nozzle sleeve 22 through the second air inlet 26. The upper end of the nozzle sleeve 22 is a spherical structure for guiding the airflow. The lower end of the nozzle insert tube 23 is fixedly connected to the nozzle guard 24 for limiting the spraying direction and spraying area of ​​the paint.

[0047] In addition, a boss 25 is provided on the nozzle tube 23, and the boss 25 and the nozzle tube 23 are cast as one piece, and an annular channel 34 is opened inside the boss 25, and the annular channel 34 is connected with the injection tube 20, and a feed channel 35 is opened between the annular channel 34 and the inner wall of the nozzle tube 23, and the feed channel 35 is inclined toward the upper end of the nozzle tube 23, and the annular channel 34 is inclined toward the injection tube 20, so that when spraying stops, the residual paint in the feed channel 35 flows into the annular channel 34, and the residual paint in the annular channel 34 flows toward the injection tube 20, which can prevent the paint from leaking and improve the cleaning effect of the annular channel 34 and the feed channel 35 in the later stage.

[0048] like Figure 7 - Figure 9As shown, in order to make the paint diffuse more evenly inside the high-pressure gas, an inner lining tube 36 is installed inside the nozzle tube 23. A conical cavity 37 is provided in the inner lining tube 36 to converge the high-pressure airflow and the paint. A spiral groove 38 is provided on the inner wall of the conical cavity 37 to accelerate the diffusion efficiency of the paint in the airflow.

[0049] like Figure 5 - Figure 8 As shown, the air pipe provided in this embodiment includes an air inlet pipe 16 and a buffer chamber 32. One end of the buffer chamber 32 is connected to the air inlet pipe 16, and the other end of the buffer chamber 32 is connected to the nozzle sleeve 22 through the first air inlet hole 27. The peripheral side of the buffer chamber 32 is connected to the upper end of the pressure relief pipe 17.

[0050] like Figure 5 - Figure 8 As shown, a buffer balloon 33 is fixed in the buffer chamber 32 provided in this embodiment relative to the output end of the air inlet pipe 16. The buffer balloon 33 is made of elastic rubber material and is filled with damping liquid. A guide plate is provided on the surface of the buffer balloon 33. The buffer balloon 33 and the damping liquid are combined to achieve high-frequency pressure fluctuation absorption. With the setting of the guide plate, the diversion of high-pressure gas after input is achieved.

[0051] like Figure 1 - Figure 4 As shown, the road traffic planning marking equipment provided in this embodiment also includes a side bracket 6 and a mobile platform 7. One end of the side bracket 6 is fixed to the mobile carrier 1 through a mounting frame 10, and a liftable roller is installed below the other end of the side bracket 6 to stabilize the side bracket 6 when marking the road, and a guide rail 11 is provided on one side of the side bracket 6. The mobile platform 7 is provided on one side of the side bracket 6, and the mobile platform 7 is slidably connected to the side bracket 6. A mounting base 8 for installing a nozzle pipe is fixed on the mobile platform 7.

[0052] like Figure 1 - Figure 4 As shown, a rack 12 is installed on one side of the guide rail 11 provided in this embodiment, a through slot is opened on one side of the mobile platform 7, and a gear 14 meshing with the rack 12 is rotatably installed in the through slot. A servo motor 13 for driving the gear 14 to rotate is fixed on the mobile platform 7, and a mounting frame 10 is provided at one end of the side bracket 6. A horizontal displacement sensor 9 and a controller are installed on the mounting frame 10. The horizontal displacement sensor 9 is used to detect the horizontal speed of the side bracket 6 perpendicular to the direction of the marking line, and feed back the detection result to the controller. The controller controls the servo motor 13 to work to compensate for the horizontal speed of the mobile platform 7 perpendicular to the direction of the marking line.

[0053] In this solution, the horizontal displacement sensor 9 can be a visual sensor. Since a lime line needs to be popped out on the road surface when marking the line for auxiliary correction of the line marking, the distance from the mobile carrier 1 to the lime line can be detected by the visual sensor, the road image can be captured by the visual sensor, the line marking position can be identified by edge detection or deep learning algorithm, and the lateral distance and lateral speed can be calculated in combination with the calibration parameters. This is more common in the prior art and has lower cost. Through the feedback speed information, the controller controls the servo motor 13 to work, so that the servo motor 13 drives the gear 14. Through the engagement between the gear 14 and the rack 12, the mobile platform 7 slides on the guide rail 11, thereby compensating for the horizontal displacement of the mobile carrier 1 perpendicular to the line marking direction, so that the mobile platform 7 and the line marking position are relatively stationary, thereby avoiding the mobile carrier 1 tilting left and right to cause the line marking to be skewed, eliminating the line marking distortion, wavy or broken problems caused by the shaking of the mobile carrier 1, and ensuring that the straightness of the line marking meets the road construction standards.

[0054] like Figure 1 - Figure 4 As shown, the mobile carrier 1 provided in this embodiment is also equipped with a hot melt spray material storage tank 2, and the output end of the hot melt spray material storage tank 2 is connected to a high-pressure pump 5, which can be a pneumatic diaphragm pump. A feed pipe 18 is provided between the output end of the high-pressure pump 5 and the paint input end of the three-way valve 19. Preferably, an insulation layer is provided on the surface of the feed pipe 18 to keep the paint in a molten state warm. A high-pressure air pump 4 is also fixed on the mobile carrier 1, and the output end of the high-pressure air pump 4 is connected to the air inlet pipe 16, which is mainly used to output a stable high-pressure airflow during the spraying process. A fixed lifting ring 15 is also slidably installed on the side bracket 6, and the fixed lifting ring 15 is in the shape of an "8". The fixed lifting ring 15 is mainly used for hanging the return pipe 49 and the feed pipe 18 to pull the return pipe 49 and the feed pipe 18 to avoid excessive bending that affects the conveying effect.

[0055] When in use (operating), the side bracket 6 is fixed to the mobile carrier 1 through the mounting frame 10, and the pipelines are connected.

[0056] During spraying, the position of the valve core 46 is adjusted by controlling the lifting valve stem 45 to connect the feed pipe 18 with the injection pipe 20. At this time, when the movable valve plate 44 moves to the lowermost end, the fixed valve plate 43 docks with the movable valve plate 44, the pressure relief pipe 17 is closed, and the high-pressure gas is input into the buffer chamber 32 through the intake pipe 16. The high-frequency pressure fluctuation of the high-pressure gas is absorbed by the buffer balloon 33 and the damping liquid. Under the setting of the guide plate, the high-pressure gas is guided after input and is completely injected into the nozzle sleeve 22 through the first air inlet hole 27, so that the air pressure inside the nozzle sleeve 22 increases. Under the action of the air pressure difference on both sides of the piston plate 30, the piston plate 30 is pushed to move. Then the needle valve stem 28 drives the blocking ball 39 to move away from the nozzle hole 40, thereby opening the nozzle hole 40, and the high-pressure gas is input into the nozzle tube 23 through the second air inlet 26. In this process, the paint enters the nozzle tube 23 through the injection pipe 20, the annular channel 34, and the feed channel 35, so that the paint is impacted by the high-pressure gas and enters the tapered cavity 37. The setting of the spiral groove 38 makes the paint diffuse more evenly in the high-pressure gas, thereby ensuring the quality of the marking spraying, and further makes the paint be atomized and output from the nozzle hole 40. Under the setting of the nozzle guard 24, the spraying range is limited, thereby realizing road marking.

[0057] When spraying is stopped, the position of the valve core 46 is adjusted by controlling the lifting valve stem 45, so that the material feeding pipe 18, the material injection pipe 20 and the connecting pipe 21 are three-way. At this time, the movable valve plate 44 is lifted to the upper end by the lifting valve stem 45, the fixed valve plate 43 and the movable valve plate 44 are misaligned, the pressure relief pipe 17 is opened, and the high-pressure gas is input into the buffer chamber 32 through the air inlet pipe 16. At this time, a part of the high-pressure gas is completely injected into the interior of the nozzle sleeve 22 through the first air inlet hole 27, and the other part flows out of the pressure relief pipe 17, thereby reducing the air pressure inside the nozzle sleeve 22. Under the action of the air pressure difference on both sides of the piston plate 30 and the relaxation of the return spring 31, the piston plate 30 is pushed to move, and then the needle valve stem 28 drives the blocking ball 39 to move toward the spray hole 40 until the spray hole 40 is closed, so as to prevent the paint from leaking and effectively avoid the paint spots formed at the starting and ending ends of the marking line due to the sudden increase or decrease in pressure. The accumulation further allows the gas inside the nozzle tube to enter the injection tube 20 through the feed channel 35 and the annular channel 34, so that the residual paint inside flows to the inside of the annular channel 34, and the residual paint inside the annular channel 34 flows toward the injection tube 20, which can not only prevent the paint from leaking, but also improve the cleaning effect of the annular channel 34 and the feed channel 35 in the later stage. The high-pressure gas inside the pressure relief pipe 17 enters the venturi tube 41, and through the adsorption effect of the venturi tube 41 and the reflux effect of the high-pressure gas inside the injection tube 20, the residual paint inside the feed pipe 18 and the injection tube 20 enters the venturi tube 41 through the connecting pipe 21, the annular tube 42, and the thin tube 48, and further allows the paint to flow back to the waste recovery tank 3 through the reflux pipe 49, which not only saves paint, but also avoids the paint solidifying in the tube, which makes the equipment maintenance more difficult.

[0058] In addition, when the vehicle deviates, the horizontal speed information perpendicular to the marking direction is fed back by the horizontal displacement sensor 9, so that the controller controls the servo motor 13 to work, so that the servo motor 13 drives the gear 14, and the engagement between the gear 14 and the rack 12 causes the mobile platform 7 to slide on the guide rail 11, thereby compensating for the horizontal displacement of the mobile carrier 1 perpendicular to the marking direction, so that the mobile platform 7 and the marking position are relatively stationary, thereby avoiding the mobile carrier 1 tilting left and right to cause the marking to be skewed, eliminating the marking distortion, wavy or broken problems caused by the shaking of the mobile carrier 1, and ensuring that the straightness of the marking meets the road construction standards.

[0059] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0060] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A road marking device for road traffic planning, characterized in that: include: A nozzle pipe, one side of which is provided with an air pipe and an injection pipe (20), which are used for air injection and material injection respectively; A needle valve stem (28) is located in the nozzle tube, and a blocking ball (39) is provided at the lower end of the needle valve stem (28) for blocking or not blocking the spray hole (40). A piston plate (30) is fixed to the upper end of the needle valve stem (28), and a return spring (31) is provided between the piston plate (30) and the top end of the nozzle tube; A three-way valve (19) is provided at one end of the injection pipe (20). A pressure relief pipe (17) is provided between the air pipe and the three-way valve (19). The pressure relief pipe (17) has a fixed valve plate (43) and a movable valve plate (44). When the three-way valve (19) cuts off the injection pipe (20), the movable valve plate (44) can be lifted to open, thereby releasing pressure from the air pipe. A venturi tube (41) is provided at one end of the pressure relief tube (17) away from the trachea, an annular tube (42) is provided outside the venturi tube (41), a thin tube (48) is provided between the annular tube (42) and the throat of the venturi tube (41), and the annular tube (42) is connected to the three-way valve (19) via a connecting tube (21); The three-way valve (19) has a valve core (46) therein, and a lifting valve stem (45) is fixedly provided at the upper end of the valve core (46). The upper end of the lifting valve stem (45) extends into the interior of the pressure relief pipe (17) and is fixedly connected to the movable valve plate (44); When the movable valve plate (44) moves to the lowermost end, the fixed valve plate (43) and the movable valve plate (44) are docked, the paint input end of the three-way valve (19) is connected to the injection pipe (20), and the connecting pipe (21) is in a closed state. When the movable valve plate (44) moves to the uppermost end, the fixed valve plate (43) and the movable valve plate (44) are dislocated, the connecting pipe (21) and the injection pipe (20) are both in a half-open state, and the paint input end of the three-way valve (19) is in a fully open state. The air pipe comprises an air inlet pipe (16) and a buffer chamber (32). One end of the buffer chamber (32) is connected to the air inlet pipe (16), and the other end of the buffer chamber (32) is connected to the nozzle sleeve (22) through a first air inlet hole (27). The peripheral side of the buffer chamber (32) is connected to the upper end of the pressure relief pipe (17).

2. A road traffic planning marking device according to claim 1, characterized in that: The nozzle pipe is composed of three parts: a nozzle sleeve (22), a nozzle insert (23), and a nozzle shield (24); the upper end of the nozzle insert (23) is inserted into the nozzle sleeve (22) and communicates with the nozzle sleeve (22) through the second air inlet (26); the lower end of the nozzle insert (23) is fixedly connected to the nozzle shield (24); A boss (25) is provided on the nozzle insert tube (23), an annular channel (34) is provided inside the boss (25), the annular channel (34) is communicated with the injection tube (20), and a feed channel (35) is provided between the annular channel (34) and the inner wall of the nozzle insert tube (23), the feed channel (35) is inclined toward the upper end of the nozzle insert tube (23), and the annular channel (34) is inclined toward the injection tube (20).

3. A road traffic planning marking device according to claim 2, characterized in that: An inner lining tube (36) is installed inside the nozzle cannula (23), a tapered cavity (37) is provided in the inner lining tube (36), and a spiral groove (38) is provided on the inner wall of the tapered cavity (37).

4. A road traffic planning marking device according to claim 3, characterized in that: A buffer balloon (33) is fixed in the buffer chamber (32) relative to the output end of the air inlet pipe (16). The buffer balloon (33) is made of elastic rubber and is filled with damping liquid. A guide plate is provided on the surface of the buffer balloon (33).

5. A road traffic planning marking device according to any one of claims 1 to 4, characterized in that: Also includes: A side bracket (6), one end of the side bracket (6) is fixed to the mobile carrier (1), and a guide rail (11) is provided on one side of the side bracket (6); A movable platform (7) is provided on one side of the side bracket (6), and the movable platform (7) is slidably connected to the side bracket (6), and a mounting seat (8) for mounting the nozzle pipe is fixed on the movable platform (7).

6. A road traffic planning marking device according to claim 5, characterized in that: A rack (12) is installed on one side of the guide rail (11), a through slot is opened on one side of the mobile platform (7), a gear (14) meshing with the rack (12) is rotatably installed in the through slot, and a servo motor (13) for driving the gear (14) to rotate is fixed on the mobile platform (7); A mounting frame (10) is provided at one end of the side bracket (6), and a horizontal displacement sensor (9) and a controller are installed on the mounting frame (10). The horizontal displacement sensor (9) is used to detect the horizontal speed of the side bracket (6) perpendicular to the marking direction and feed back the detection result to the controller. The controller controls the servo motor (13) to work so as to compensate for the horizontal speed of the mobile platform (7) perpendicular to the marking direction.

7. A road traffic planning marking device according to claim 6, characterized in that: A fixed lifting ring (15) is also slidably mounted on the side bracket (6), and the fixed lifting ring (15) is in the shape of an "8".

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