Marking equipment for road traffic planning

Abstract

The invention discloses marking equipment for road traffic planning, and relates to the technical field of road marking. The marking equipment for road traffic planning comprises a spray head pipe, and a gas pipe and a material injection pipe are arranged on one side of the spray head pipe and used for gas injection and material injection respectively; the needle valve rod is located in the spray head pipe, a blocking ball is arranged at the lower end of the needle valve rod and used for blocking or not blocking the spray hole, a piston plate is fixed to the upper end of the needle valve rod, and a reset spring is arranged between the piston plate and the inner top end of the spray head pipe. The movable valve plate is jacked to open the pressure relief pipe while the three-way valve cuts off the material injection pipe, so that the air pressure in the nozzle pipe is reduced, the paint spraying inertia caused by sudden pressure drop is effectively eliminated through the stepped reduction of the air pressure, and the blocking ball is pushed to block the spraying hole through the synergistic effect of the reset spring and the air pressure difference, so that physical secondary sealing is formed. Mechanical-pneumatic double-drive sealing is achieved, so that paint leakage is reduced, and paint point accumulation caused by sudden pressure increase or sudden pressure drop at the starting end and the stopping end of the marking line is avoided.

Description

Technical Field

[0001] The 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, elevation markings, raised road signs and contour signs to convey traffic information such as guidance, restrictions and warnings to traffic participants. Since road markings cover a wide area, special road marking equipment is required for marking work.

[0003] A Chinese patent with publication number CN118516900A discloses a road marking machine, which uses three restraining rings to restrain multiple nozzles. The restraining rings are arranged in a ring shape, and the power component drives the nozzles to move in the ring-shaped restraining rings. Since the three restraining rings are arranged concentrically, multiple nozzles can form straight lines of various angles in the plane, so that the marking line of the required width can be drawn, allowing the marking machine to complete a wider line drawing work in one marking work.

[0004] However, in actual use, we found that due to the unstable pressure at the beginning and end of the spray gun, such as the sudden change in pressure at the moment of opening and closing, excess paint is 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 causes a waste of paint and affects the quality of the marking. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a road marking device for road traffic planning, which solves the problem of paint spot residues at the starting and ending ends of the road 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 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; a three-way valve, the three-way valve is provided at one end of the injection pipe, a pressure relief pipe is provided between the air pipe and the three-way valve, a fixed valve plate and a moving valve plate are provided in the pressure relief pipe, and when the three-way valve cuts off the injection pipe, the moving 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 pipe.

[0008] Further, a valve core is provided inside the three-way valve. A lifting valve rod is fixedly provided at the upper end of the valve core. The upper end of the lifting valve rod extends into the pressure relief pipe and is fixedly connected to the moving valve plate. When the moving valve plate moves to the lowermost end, the fixed valve plate is docked with the moving valve plate. The coating input end of the three-way valve is connected to the injection pipe, and the connecting pipe is in a closed state. When the moving valve plate moves to the uppermost end, the fixed valve plate is misaligned with the moving valve plate. Both the connecting pipe and the injection pipe are in a semi-open state, and the coating input end of the three-way valve is in a fully open state.

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

[0010] Further, a lining pipe is installed inside the spray head insertion pipe. A conical cavity is provided inside the lining pipe, and spiral grooves are provided on the inner wall of the conical cavity.

[0011] Further, the air pipe includes two parts: an air inlet pipe and a buffer chamber. One end of the buffer chamber is communicated with the air inlet pipe, and the other end of the buffer chamber is communicated with the spray head sleeve through a first air inlet hole. The periphery of the buffer chamber is communicated with the upper end of the pressure relief pipe.

[0012] Further, a buffer balloon is fixed inside the buffer chamber opposite to the output end of the air inlet pipe. The buffer balloon is made of elastic rubber material, and damping liquid is filled inside the buffer balloon. A flow guide plate is provided on the surface of the buffer balloon.

[0013] Further, it further includes a side bracket. One end of the side bracket is fixed on the moving carrier, and a guiding slide rail is provided on one side of the side bracket. A moving platform is provided on one side of the side bracket, and the moving platform is slidably connected to the side bracket. An installation seat for installing the spray head pipe is fixed on the moving platform.

[0014] Further, a rack is installed on one side of the guiding slide rail. A through groove is opened on one side of the moving platform. A gear meshing with the rack is rotatably installed in the through groove. A servo motor for driving the gear to rotate is fixed on the moving platform. An installation frame is provided at one end of the side bracket. A horizontal displacement sensor and a controller are installed on the installation frame. The horizontal displacement sensor is used to detect the horizontal speed of the side bracket perpendicular to the marking line direction and feed the detection result back to the controller. The controller controls the servo motor to work to compensate for the horizontal speed of the moving platform perpendicular to the marking line direction.

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

[0016] The present invention has the following beneficial effects: (1) The road marking equipment for traffic planning cuts off the injection pipe through the three-way valve and lifts the movable valve plate to open the pressure relief pipe, 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 air 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 line due to a sudden increase or drop in pressure.

[0017] (2) The road marking equipment for traffic planning can prevent paint leakage by setting the feed channel and the annular channel in an inclined manner, and is conducive to the backflow of gas inside the nozzle pipe into the injection pipe, 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 pipe can be recycled, which not only saves paint but also avoids the paint solidifying in the pipe, which makes the equipment maintenance more difficult.

[0018] (3) The road 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 static, eliminating the marking distortion, wavy or broken line problems caused by the shaking of the mobile carrier, and ensuring that the straightness of the marking meets the road construction standards.

[0019] (4) The road marking equipment used for traffic planning uses a conical spiral cavity to generate a greater rotational shear force, improve the paint atomization effect, and reduce the particle size of the paint.

[0020] (5) The road marking equipment for road 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, the high-pressure gas can be diverted after input, thereby reducing the sudden increase or decrease in pressure caused by air flow fluctuations, and further improving the quality of the marking.

[0021] 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

[0022] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the installation structure of the mobile platform in the present invention; Figure 3 For the present inventionFigure 2 Another perspective view; Figure 4 Schematic diagram of the installation structure of the gear and the rack in the present invention; Figure 5 Schematic diagram of the internal structure of the nozzle sleeve in the present invention; Figure 6 In the present invention Figure 5 Another perspective view; Figure 7 Schematic diagram of the internal structure of the nozzle pipe in the present invention; Figure 8 In the present invention Figure 7 Front view; Figure 9 Position relationship diagram of the fixed valve plate and the moving valve plate in the present invention; Figure 10 In the present invention Figure 9 Front view; Figure 11 In the present invention Figure 10 Enlarged view of part A in; Figure 12 Schematic diagram of the connection structure of the three-way valve in the present invention.

[0023] In the figure, 1, mobile carrier; 2, hot melt spray material storage tank; 3, waste recycling tank; 4, high-pressure air pump; 5, high-pressure pump; 6, side bracket; 7, mobile platform; 8, mounting seat; 9, horizontal displacement sensor; 10, mounting frame; 11, guiding slide rail; 12, rack; 13, servo motor; 14, gear; 15, fixed lifting ring; 16, air inlet pipe; 17, pressure relief pipe; 18, material conveying pipe; 19, three-way valve; 20, injection pipe; 21, connecting pipe; 22, nozzle sleeve; 23, nozzle insertion pipe; 24, nozzle guard; 25, convex platform; 26, second air inlet hole; 27, first air inlet hole; 28, needle valve rod; 29, cylinder block; 30, piston plate; 31, return spring; 32, buffer chamber; 33, buffer balloon; 34, annular channel; 35, feed channel; 36, inner liner pipe; 37, conical cavity; 38, spiral groove; 39, blocking ball; 40, spray hole; 41, Venturi tube; 42, annular tube; 43, fixed valve plate; 44, moving valve plate; 45, lifting valve rod; 46, valve core; 47, connecting through hole; 48, thin pipe; 49, return pipe. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc., indicating the 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 referred components or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0026] Please refer to Figure 1 - Figure 12 , an embodiment of the present invention provides a technical solution: a marking device for road traffic planning, including a spray head pipe. One side of the spray head pipe is provided with an air pipe and a material injection pipe 20, which are respectively used for injecting air and material into the spray head pipe. The air pipe is located at a position close to the upper end on the outer side of the spray head pipe, and the material injection pipe 20 is located at a position close to the lower end on the outer side of the spray head pipe.

[0027] The marking device for road traffic planning provided in this embodiment further includes a needle valve rod 28. The needle valve rod 28 is located inside the spray head pipe, and a plug 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 plug ball 39 to reduce paint adhesion, and the maximum diameter of the plug ball 39 is larger than the inner diameter of the spray hole 40 to prevent the plug ball 39 from completely falling into the spray hole 40. The upper end of the needle valve rod 28 is fixed with a piston plate 30, and a return spring 31 is provided between the piston plate 30 and the inner top end of the spray head pipe. The return spring 31 is mainly used to drive the piston plate 30 to reset, so that the needle valve rod 28 drives the plug ball 39 to move towards the spray hole 40.

[0028] In addition, the marking device for road traffic planning provided in this embodiment further includes a three-way valve 19. The three-way valve 19 is provided at one end of the material injection pipe 20. A pressure relief pipe 17 is provided between the air pipe and the three-way valve 19. A fixed valve plate 43 and a movable valve plate 44 are provided inside the pressure relief pipe 17. When the three-way valve 19 cuts off the material 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, so that the air pressure injected into the spray head pipe drops, and further the return spring 31 expands, thereby pushing the piston plate 30 to move. It should be noted that a cylinder body 29 is installed at the inner top end of the spray head pipe. The return spring 31 is provided between the top end 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 limiting ring is provided at the lower end of the cylinder body 29 to prevent the piston plate 30 from moving excessively.

[0029] In this solution, the injection pipe 20 is cut off by the three-way valve 19, so that the coating input end is cut off, thus avoiding the continuous input of coating from the source and preventing coating leakage. At this time, the three-way valve 19 lifts the moving valve plate 44, so that the pressure relief pipe 17 is opened, thereby realizing the air pressure relief of the air pipe. Further, the air pressure in the injection nozzle pipe decreases. 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. Then, the needle valve rod 28 drives the plug ball 39 to move towards the spray hole 40 until the plug ball 39 blocks the spray hole 40 to achieve secondary leakage prevention, effectively avoiding the paint point accumulation formed at the start and end of the marking due to sudden increase or decrease in pressure.

[0030] As Figure 12 shown, a Venturi tube 41 is provided at one end of the pressure relief pipe 17 away from the air pipe. 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 communicated with 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 the end of the return pipe 49 is located on the moving carrier 1 where a waste paint recovery tank 3 is provided for recovering the paint in the pipe, which not only saves the paint but also avoids the increase in the equipment maintenance difficulty caused by the solidification of the paint in the pipe.

[0031] It should be noted that when the air flow passes through the Venturi tube 41, due to its special structural design, after the air flow smoothly enters the inlet section, it gradually accelerates in the contraction section. During this process, the cross-sectional area continuously decreases. According to the continuity equation, the volume of the air flow passing through each cross-sectional area is equal at the same time, so the flow velocity increases. According to Bernoulli's equation, the kinetic energy of the air flow increases, and the potential energy and pressure energy decrease accordingly, so that the flow velocity reaches the maximum at the throat and the pressure drops to the lowest. This creates a pressure difference between the inlet and the throat of the Venturi tube 41. The greater the fluid flow rate, the higher the acceleration degree in the contraction section, the greater the flow velocity at the throat, the lower the pressure, and the greater the pressure difference generated, so that the paint inside the thin tube 48 is adsorbed at the throat of the Venturi tube 41, thus avoiding the solidification of the paint in the pipe and realizing the recovery of the paint.

[0032] As Figure 9 - Figure 11 shown, to realize the linkage between the three-way valve 19 and the moving valve plate 44, the three-way valve 19 in this embodiment has a valve core 46. A lifting valve rod 45 is fixedly provided at the upper end of the valve core 46. The upper end of the lifting valve rod 45 extends into the pressure relief pipe 17 and is fixedly connected to the moving valve plate 44. Preferably, the lifting valve rod 45 is driven by an externally provided electric telescopic cylinder or cylinder, etc. This driving method is relatively common and will not be elaborated in this embodiment. Preferably, the valve core 46 is of a sleeve type structure, and a connecting through hole 47 is opened outside the valve core 46. The connecting through hole 47 is adapted to the inlet end of the injection pipe 20 for communicating the feed end of the three-way valve 19 with the injection pipe 20.

[0033] Specifically, when the moving valve plate 44 moves to the lowermost end, the fixed valve plate 43 is butted against the moving valve plate 44 at this time, the pressure relief pipe 17 is closed, and the gas is completely injected into the inside of the nozzle pipe. The air pressure inside the nozzle pipe 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, and then the needle valve rod 28 drives the plug ball 39 to move away from the spray hole 40, realizing the opening of the spray hole 40. Synchronously, the coating 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, realizing the injection of the coating. When the moving valve plate 44 moves to the uppermost end, the fixed valve plate 43 is misaligned with the moving valve plate 44 at this time, the pressure relief pipe 17 is opened, so that the air pressure in the nozzle pipe decreases. 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 rod 28 drives the plug ball 39 to move towards the spray hole 40 until the plug ball 39 blocks the spray hole 40 to realize the secondary anti-leakage of the coating, effectively avoiding the paint point accumulation formed at the start and end of the marking due to sudden increase or decrease of pressure. At the same time, the connecting pipe 21 and the injection pipe 20 are both in a semi-open state, the coating input end of the three-way valve 19 is in a fully open state, and the gas inside the nozzle pipe passes through the injection pipe 20, so that the internal coating of the injection pipe 20 can be cleaned. It should be noted that mutually matching stepped grooves or bevels can be provided at the connection between the moving valve plate 44 and the fixed valve plate 43, and a gasket can be installed at the connection to improve the sealing effect.

[0034] As Figure 6 - Figure 9 As shown, the nozzle pipe provided in this embodiment is composed of a nozzle sleeve 22, a nozzle insert 23, and a nozzle guard 24. The upper end of the nozzle insert 23 is inserted into the nozzle sleeve 22 and is communicated with the nozzle sleeve 22 through a second air inlet hole 26. The upper end of the nozzle sleeve 22 is a spherical structure for guiding the air flow. The lower end of the nozzle insert 23 is fixedly connected to the nozzle guard 24 for restricting the coating spraying direction and spraying area.

[0035] In addition, a boss 25 is provided on the nozzle insert 23. The boss 25 is integrally cast with the nozzle insert 23, and an annular channel 34 is opened inside the boss 25. The annular channel 34 is communicated with the injection pipe 20, and a feed channel 35 is opened between the annular channel 34 and the inner wall of the nozzle insert 23. The feed channel 35 is inclined towards the upper end inside the nozzle insert 23, and the annular channel 34 is inclined towards the injection pipe 20. When spraying stops, the coating remaining in the feed channel 35 flows into the annular channel 34, and the remaining coating in the annular channel 34 flows towards the injection pipe 20, which can not only prevent coating leakage but also improve the cleaning effect of the annular channel 34 and the feed channel 35 in the later stage.

[0036] As Figure 7 - Figure 9As shown, in order to make the coating diffuse more evenly inside the high-pressure gas, a lining tube 36 is installed inside the nozzle insertion tube 23. A conical cavity 37 is provided inside the lining tube 36 to converge the high-pressure air flow and the coating. A spiral groove 38 is provided on the inner wall of the conical cavity 37, thereby accelerating the diffusion efficiency of the coating inside the air flow.

[0037] As Figure 5 - Figure 8 As shown, the air tube provided in this embodiment includes two parts: an air inlet tube 16 and a buffer chamber 32. One end of the buffer chamber 32 is communicated with the air inlet tube 16, and the other end of the buffer chamber 32 is communicated with the nozzle sleeve 22 through a first air inlet hole 27. The periphery of the buffer chamber 32 is communicated with the upper end of the pressure relief tube 17.

[0038] As Figure 5 - Figure 8 As shown, a buffer balloon 33 is fixed inside the buffer chamber 32 provided in this embodiment relative to the output end of the air inlet tube 16. The buffer balloon 33 is made of elastic rubber material, and the inside of the buffer balloon 33 is filled with damping liquid. A flow guide plate is provided on the surface of the buffer balloon 33. Through the combination of the buffer balloon 33 and the damping liquid, high-frequency pressure fluctuations are absorbed. Under the setting of the flow guide plate, the diversion of the high-pressure gas after input is realized.

[0039] As Figure 1 - Figure 4 As shown, the marking device for road traffic planning provided in this embodiment further includes a side bracket 6 and a moving platform 7. One end of the side bracket 6 is fixed to the moving carrier 1 through a mounting bracket 10. A liftable roller is installed below the other end of the side bracket 6 for the stability of the side bracket 6 during road marking. A guide slide rail 11 is provided on one side of the side bracket 6. The moving platform 7 is arranged on one side of the side bracket 6 and is slidably connected to the side bracket 6. A mounting seat 8 for installing the nozzle tube is fixed on the moving platform 7.

[0040] As Figure 1 - Figure 4 As shown, a rack 12 is installed on one side of the guide slide rail 11 provided in this embodiment. A through groove is opened on one side of the moving platform 7. A gear 14 meshing with the rack 12 is rotatably installed in the through groove. A servo motor 13 for driving the gear 14 to rotate is fixed on the moving platform 7. A mounting bracket 10 is provided at one end of the side bracket 6. A horizontal displacement sensor 9 and a controller are installed on the mounting bracket 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 the detection result back to the controller. The controller controls the servo motor 13 to work to compensate for the horizontal speed of the moving platform 7 perpendicular to the marking direction.

[0041] In this solution, the horizontal displacement sensor 9 can be a vision sensor. Since it is necessary to pop up a lime line on the road surface for auxiliary correction of the marking during the marking process, the distance from the moving carrier 1 to the lime line can be detected by the vision sensor. The road image is captured by the vision sensor, and the edge detection or deep learning algorithm is used to identify the marking position. The lateral distance and lateral speed are calculated in combination with the calibration parameters. This is relatively common in the prior art and has a low 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 meshing between the gear 14 and the rack 12, the moving platform 7 slides on the guiding slide rail 11, thereby compensating for the horizontal displacement of the moving carrier 1 in the direction perpendicular to the marking, making the moving platform 7 relatively stationary with respect to the marking position, thus avoiding the marking from being skewed due to the left and right inclination of the moving carrier 1, and eliminating the problems of marking distortion, waviness or broken lines caused by the shaking of the moving carrier 1, ensuring that the straightness of the marking meets the road construction standards.

[0042] As Figure 1 - Figure 4 shown, a hot melt paint storage tank 2 is further installed on the moving carrier 1 provided in this embodiment. The output end of the hot melt paint storage tank 2 is connected to a high-pressure pump 5. The high-pressure pump 5 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, a heat preservation layer is provided on the surface of the feed pipe 18 for heat preservation of the paint in a molten state. A high-pressure air pump 4 is also fixed on the moving carrier 1. The output end of the high-pressure air pump 4 is communicated with the air inlet pipe 16, which is mainly used to output a stable high-pressure air flow during the spraying process. A fixed hanging ring 15 is also slidably installed on the side bracket 6. The fixed hanging ring 15 is in an "8" shape and 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 prevent excessive bending from affecting the conveying effect.

[0043] During use (during operation), the side bracket 6 is fixed on the moving carrier 1 through the mounting bracket 10, and each pipeline is connected.

[0044] During spraying, by controlling the lifting valve rod 45 to adjust the position of the valve core 46, the material delivery pipe 18 is connected to the injection pipe 20. At this time, when the moving valve plate 44 moves to the lowermost end, the fixed valve plate 43 is butted against the moving valve plate 44, the pressure relief pipe 17 is closed, and high-pressure gas is input into the buffer chamber 32 through the air inlet pipe 16. Through the cooperation of the buffer balloon 33 and the damping liquid, the high-frequency pressure fluctuation absorption of the high-pressure gas is realized. Under the setting of the guide plate, the diversion of the high-pressure gas after input is realized, and it is completely injected into the inside of the nozzle sleeve 22 through the first air inlet hole 27, increasing the air pressure inside the nozzle sleeve 22. 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 plug ball 39 to move away from the spray hole 40, realizing the opening of the spray hole 40. The high-pressure gas is input into the inside of the nozzle insert 23 through the second air inlet hole 26. During this process, the paint enters the inside of the nozzle insert 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 conical cavity 37. Through the setting of the spiral groove 38, the paint is more evenly diffused in the high-pressure gas, thus ensuring the marking spraying quality. Further, the paint is atomized and output from the spray hole 40. Under the setting of the nozzle guard 24, the spraying range is limited, thus realizing the road marking.

[0045] When spraying stops, by controlling the lifting valve rod 45, the position of the valve core 46 is adjusted to make the material conveying pipe 18, the material injection pipe 20 and the connecting pipe 21 form a tee. At this time, the moving valve plate 44 is jacked up by the lifting valve rod 45 to the uppermost end, the fixed valve plate 43 is misaligned with the moving valve plate 44, 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, part of the high-pressure gas is completely injected into the inside of the nozzle sleeve 22 through the first air inlet hole 27, and the other part flows out through the pressure relief pipe 17, so that the air pressure inside the nozzle sleeve 22 drops. 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 rod 28 drives the plug ball 39 to move towards the spray hole 40 until the spray hole 40 is closed to achieve paint leakage prevention, effectively avoiding the paint spot accumulation formed at the start and end of the marking due to sudden increase or decrease in pressure, and further enabling the gas inside the nozzle pipe to enter the material injection pipe 20 through the feed channel 35 and the annular channel 34, making the remaining paint inside flow into the annular channel 34. The remaining paint inside the annular channel 34 flows towards the material injection pipe 20, which can not only prevent paint leakage but also improve the cleaning effect of the annular channel 34 and the feed channel 35 in the later stage. And the high-pressure gas inside the pressure relief pipe 17 enters the Venturi tube 41. Through the adsorption effect of the Venturi tube 41 and the reflux effect of the high-pressure gas inside the material injection pipe 20, the remaining paint inside the material conveying pipe 18 and the material injection pipe 20 enters the Venturi tube 41 through the connecting pipe 21, the annular pipe 42 and the thin pipe 48, and further enables the paint to flow back to the waste recycling tank 3 through the return pipe 49, which not only saves paint but also avoids the increase in equipment maintenance difficulty caused by the solidification of paint in the pipe.

[0046] In addition, when the vehicle deviates, based on the horizontal speed information perpendicular to the marking direction feedback by the horizontal displacement sensor 9, the controller controls the servo motor 13 to work. Thus, the servo motor 13 drives the gear 14, and through the meshing between the gear 14 and the rack 12, the moving platform 7 slides on the guiding slide rail 11, thereby compensating for the horizontal displacement of the moving carrier 1 perpendicular to the marking direction, making the moving platform 7 and the marking position relatively stationary, thus avoiding the marking skew caused by the left and right inclination of the moving carrier 1, and eliminating the problems of marking distortion, waviness or broken lines caused by the shaking of the moving carrier 1, ensuring that the straightness of the marking meets the road construction standards.

[0047] It should be noted that in this document, relational terms such as first and second are only used 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 term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0048] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited 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) for respectively injecting air and injecting materials; A needle valve stem (28), the 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 at 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 arranged at one end of the injection pipe (20), and a pressure relief pipe (17) is arranged 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) in it. When the three-way valve (19) cuts off the injection pipe (20), the movable valve plate (44) can be lifted up to open, thereby releasing pressure from the air pipe.

2. A road traffic planning marking device according to claim 1, characterized in that: A venturi tube (41) is provided at one end of the pressure relief tube (17) away from the air pipe, 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).

3. A road traffic planning marking device according to claim 2, characterized in that: The three-way valve (19) has a valve core (46) therein, and a lifting valve stem (45) is fixedly disposed 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) is connected to the movable valve plate (44), 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) is misaligned with the movable valve plate (44), 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.

4. A road traffic planning marking device according to claim 3, characterized in that: The nozzle pipe is composed of three parts: a nozzle sleeve (22), a nozzle insert pipe (23), and a nozzle shield (24); the upper end of the nozzle insert pipe (23) is inserted into the nozzle sleeve (22) and communicates with the nozzle sleeve (22) through a second air inlet hole (26); the lower end of the nozzle insert pipe (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).

5. A road traffic planning marking device according to claim 4, characterized in that: An inner liner tube (36) is installed inside the nozzle cannula (23), a conical cavity (37) is provided inside the inner liner tube (36), and a spiral groove (38) is provided on the inner wall of the conical cavity (37).

6. A road traffic planning marking device according to claim 5, characterized in that: The air pipe comprises an air inlet pipe (16) and a buffer chamber (32); one end of the buffer chamber (32) is in communication with the air inlet pipe (16), and the other end of the buffer chamber (32) is in communication with the nozzle sleeve (22) via a first air inlet hole (27); the peripheral side of the buffer chamber (32) is in communication with the upper end of the pressure relief pipe (17).

7. A road traffic planning marking device according to claim 6, characterized in that: A buffer balloon (33) is fixed in the buffer chamber (32) at 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).

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

9. A road traffic planning marking device according to claim 8, 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 mounted 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 line 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 line direction.

10. A road traffic planning marking device according to claim 9, 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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