Road marking device

Abstract

The present invention discloses a road marking device, which belongs to the technical field of road construction, and comprises a frame and a nozzle arranged on one side of the frame, a shielding cover is arranged on one side of the frame, the nozzle is located at the rear end of the inner cavity of the shielding cover, and three inner air ducts are arranged in the shielding cover; the front half of the inner air duct is a blowing cavity, and an air outlet is arranged on the front side of the blowing cavity; the rear half of the inner air duct is a suction cavity, and an air inlet is arranged on the rear side of the suction cavity; the outer rotating sleeve of the inner air duct is provided with an outer air duct, and two adjacent outer air ducts rotate synchronously in opposite directions, and a plurality of channel openings are arranged on the outer air duct at equal intervals, and swingable wind shields are arranged on both sides of the channel openings. The present invention sets a shielding cover to surround the road surface part and the nozzle to be sprayed with markings, and relatively isolates them from the external environment, which can effectively reduce the interference and repeated pollution of external impurities and dust, improve the road cleaning effect and ensure the marking effect.

Description

Technical Field

[0001] The invention relates to the technical field of road construction, and in particular to a road marking device. Background Art

[0002] In the process of road marking construction, it is usually necessary to use a blower to clean the road surface to be sprayed with markings. After cleaning, the road marking vehicle is used to spray the road markings. In the actual operation process, after the road surface cleaning work is carried out, the dust and impurities in the environment will quickly fall onto the cleaned road surface before the nozzle sprays the markings, which will have an adverse effect on the marking effect. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a road marking device, which at least achieves the purpose of better road cleaning effect and better road marking effect.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a road marking device, comprising a frame and a nozzle arranged on one side of the frame, a shielding cover is arranged on one side of the frame, the nozzle is located at the rear end of the inner cavity of the shielding cover, and three inner air ducts are arranged in the shielding cover;

[0005] The front half of the inner air duct is a blowing cavity, and an air outlet is arranged on the front side of the blowing cavity; the rear half of the inner air duct is a suction cavity, and an air inlet is arranged on the rear side of the suction cavity;

[0006] The outer rotating sleeve of the inner air duct is provided with an outer air duct, and two adjacent outer air ducts rotate synchronously in opposite directions. A plurality of channel openings are arranged on the outer air duct at equal intervals, and swingable wind shields are arranged on both sides of the channel openings. The two wind shields swing relative to or away from each other at the outer ends so that the outer end size of the channel opening is in the minimum state or the maximum state. The channel opening is in the minimum state and the maximum state respectively when passing through the air outlet or the air inlet, and the channel openings on the two adjacent outer air ducts are in the reverse rotating state.

[0007] Furthermore, the three blowing chambers are connected in sequence through a first air duct, and the first air duct located at the most upstream of the wind flow movement direction is connected to a blower; the three suction chambers are connected in sequence through a second air duct, and the second air duct located at the most downstream of the wind flow movement direction is connected to an exhaust fan, the exhaust end of the exhaust fan and the air inlet end of the blower are connected through a third air duct, and a filter tube is arranged in the third air duct.

[0008] Furthermore, the side surfaces of the shielding cover are rotatably mounted with external gear rings corresponding to each external air duct, and two adjacent external gear rings are meshed via a first gear set, and the end of the external air duct is fixedly mounted to an internal gear ring located inside the external gear ring, and the outer side surface of the inner gear ring is meshed with the inner surface of the external gear ring via a circular gear.

[0009] Furthermore, running wheels are rotatably mounted on both sides of the shielding cover, a second gear set is fixedly mounted on the inner side of the running wheel, and the second gear set is meshed with the outer gear ring on the rearmost side.

[0010] Furthermore, the widths of the air outlet and the air inlet are both greater than the width of the road marking, the length of the passage opening is greater than the widths of the air outlet and the air inlet, and the length of the wind shield is adapted to the length of the passage opening.

[0011] Furthermore, an inner rotating shaft is provided at the inner end of the wind shield, and the inner rotating shaft is rotatably installed on the inner wall of the channel opening. External hinge joints are provided on the outer sides of both side ends of the wind shield, and a pull rod is sleeved on the external hinge joint. The inner end of the pull rod is rotatably connected with a pull block, and the pull block is slidably installed on the end of the outer side surface of the inner air duct, and the pull block drives the wind shield to swing through the pull rod and controls the channel opening to switch between the maximum state and the minimum state.

[0012] Furthermore, annular grooves are provided at both ends of the outer side of the inner air duct, guide grooves are provided on the side walls of the annular grooves, guide rods are rotatably installed on both sides of the pull block, and the guide rods are slidably arranged in the guide grooves, and the pull block is located in the annular groove.

[0013] Furthermore, the guide groove includes a front part and a rear part distributed front to back, and an upper part and a lower part connecting the upper and lower ends of the front part and the rear part; wherein the front part and the rear part are both arc-shaped, and the diameter of the front part is larger than the diameter of the rear part.

[0014] Furthermore, an arc-shaped guide surface is provided in a region of the inner top wall of the shielding cover between two adjacent outer air ducts.

[0015] Furthermore, the external fixed sleeve of the external air duct is provided with a cleaning brush, and the cleaning brush is provided with an opening at a position corresponding to the passage opening.

[0016] According to the technical solution provided by the present invention, the present invention has the following beneficial effects:

[0017] (1) The present invention provides a shielding cover to surround the road surface portion to be sprayed with markings and the nozzle, and relatively isolate them from the external environment, which can effectively reduce the interference and repeated pollution of external impurities and dust, improve the road surface cleaning effect and ensure the marking effect.

[0018] (2) The present invention sets three sets of internal and external air ducts to cooperate with each other, which can achieve the effect of blowing and exhausting air at the same time, greatly improving the road cleaning effect and ensuring the effect of road marking. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings herein are used to provide further explanation of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their description are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 It is an overall schematic diagram of the present invention;

[0021] Figure 2 is an overall schematic diagram of the shielding cover of the present invention;

[0022] Figure 3 is a schematic diagram of three external air ducts of the present invention;

[0023] Figure 4 The present invention Figure 3 Enlarged view of point A in the middle;

[0024] Figure 5 It is an overall schematic diagram of the windshield, the pull rod and the pull block of the present invention;

[0025] Figure 6 is a schematic diagram of the internal air duct of the present invention;

[0026] Figure 7 is a schematic diagram of a guide groove of the present invention;

[0027] Figure 8 It is a schematic diagram of the blowing chamber and the suction chamber of the present invention;

[0028] Fig. 9 is a schematic diagram of an outer gear ring, an inner gear ring, a first gear set and a second gear set of the present invention;

[0029] Fig.10 is a schematic diagram of the arc-shaped guide surface of the present invention;

[0030] Fig.11 It is a schematic diagram of the inner rotating shaft in the passage opening of the present invention.

[0031] In the figure: 1, frame; 2, shielding cover; 3, inner air duct; 4, blowing chamber; 5, air outlet; 6, suction chamber; 7, air inlet; 8, outer air duct; 9, passage opening; 10, wind shield; 11, first air duct; 12, blower; 13, second air duct; 14, exhaust fan; 15, third air duct; 16, filter tube; 17, outer gear ring; 18, first gear set; 19, inner gear ring; 20, round gear Wheel; 21, walking wheel; 22, second gear set; 23, inner rotating shaft; 24, outer hinge joint; 25, pull rod; 26, pull block; 27, annular groove; 28, guide groove; 28.1, front part; 28.2, rear part; 28.3, upper part; 28.4, lower part; 29, guide rod; 30, lower closed area; 31, upper closed area; 32, arc-shaped guide surface; 33, cleaning brush; 34, open mouth. DETAILED DESCRIPTION

[0032] In order to make those skilled in the art better understand the present invention, the present invention is further clearly and completely described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the features in the embodiments and examples of this application can be combined with each other.

[0033] This embodiment provides a road marking device, including a frame 1 and a nozzle arranged on one side of the frame 1, the nozzle is used to spray the marking slurry. On this basis, Figure 1 , Figure 2 As shown, in this embodiment, a shielding cover 2 is further provided on one side of the vehicle frame 1, and the nozzle is located at the rear end of the inner cavity of the shielding cover 2. In order to facilitate the determination of the nozzle position, a scale line for marking the nozzle position can be provided on the outer surface of the shielding cover 2. The shielding cover 2 is used to relatively separate the nozzle from the external environment, which can reduce the interference of the external environment on the slurry sprayed from the nozzle, and improve the effect of road marking spraying.

[0034] like Figure 6 As shown, three inner air ducts 3 are arranged in the shielding cover 2, and the front half of the inner air duct 3 is a blowing cavity 4 ( Figure 8 ), an air outlet 5 is provided on the front side of the blowing chamber 4, and the air flow in the blowing chamber 4 is blown out from the air outlet 5, and the blown air flow is directly blown to the road surface in front of the nozzle to clean the road surface that is about to be sprayed with markings.

[0035] like Figure 8 As shown, the rear half of the inner air duct 3 is a suction chamber 6, and an air inlet 7 is provided on the rear side of the suction chamber 6. The air in the shielding cover 2 enters the suction chamber 6 from the air inlet 7, and the dust in the shielding cover 2 is sucked into the suction chamber 6 and then discharged, thereby reducing the impurities and dust generated by the air flow sweeping of the air outlet 5 from falling into the marking area again, thereby improving the road marking effect.

[0036] like Figure 3 As shown, an outer rotating sleeve of the inner air duct 3 is provided with an outer air duct 8, and two adjacent outer air ducts 8 rotate synchronously in opposite directions. At this time, the middle outer air duct 8 rotates in the opposite direction to the two outer air ducts 8 on its two sides.

[0037] like Figure 3 As shown, in this embodiment, four passage openings 9 are arranged at equal intervals on the outer air duct 8, and the passage openings 9 on the outer air duct 8 at the front and rear ends of the shielding cover 2 sequentially pass through the air outlet 5 on the front side of the inner air duct 3 from bottom to top (clockwise direction). The passage opening 9 on the outer air duct 8 located in the middle of the shielding cover 2 sequentially passes through the air outlet 5 on the inner air duct 3 in the middle position from top to bottom (counterclockwise direction).

[0038] like Figure 4 , Figure 5As shown, wind shields 10 are provided on both sides of the channel opening 9. The two wind shields 10 swing relative to or away from each other at the outer ends so that the outer end size of the channel opening 9 is in the minimum state or the maximum state. The channel opening 9 is in the minimum state and the maximum state respectively when passing through the air outlet 5 or the air inlet 7, and the channel openings 9 on the two adjacent external air ducts 8 are in the reverse rotation state.

[0039] The airflow blown out from the channel opening 9 on the middle external air duct 8 through the air outlet 5 can quickly enter the channel opening 9 on the front external air duct 8 through the air inlet 7 after sweeping the road surface; the airflow blown out from the channel opening 9 on the external air duct 8 at the rear end through the air outlet 5 can quickly enter the channel opening 9 on the middle external air duct 8 through the air inlet 7 after sweeping the road surface. Through the above arrangement, the airflow blown out from the air outlet 5 can be sucked into the air inlet 7 more quickly after sweeping the ground, thereby improving the cleaning effect of impurities and dust in the shielding cover 2.

[0040] In a preferred embodiment, Figure 3 , Figure 6 As shown, the three blowing chambers 4 are connected in sequence through the first air duct 11, and the first air duct 11 located upstream of the wind flow direction is connected to a blower 12 ( Figure 2 ).like Figure 3 As shown, the three suction chambers 6 are connected in sequence through the second air duct 13, and the second air duct 13 located at the most downstream of the wind flow direction is connected to the exhaust fan 14 ( Figure 2 ), the exhaust end of the exhaust fan 14 is connected to the air inlet end of the blower 12 through a third air duct 15, and a filter tube 16 is provided on the third air duct 15.

[0041] Through the above arrangement, the air flow circulation in the shielding cover 2 can form a relatively closed loop state. On the one hand, the filter tube 16 is used to remove impurities and dust from the extracted air. On the other hand, the filter tube 16 is used to ensure that the air entering the blowing chamber 4 is relatively clean air with low dust content.

[0042] In this embodiment, the first air duct 11 and the second air duct 13 are provided with a protective tube outside the shielding cover 2. In order to increase the air intake, an air intake branch pipe can be opened on the third air duct 15 near the air intake end of the blower 12, and a valve can be provided on the air intake branch pipe.

[0043] In a relatively specific embodiment, Fig. 9As shown, the side of the shielding cover 2 is rotatably mounted with an outer gear ring 17 corresponding to each outer air duct 8, and two adjacent outer gear rings 17 are meshed through a first gear set 18, and the end of the outer air duct 8 is fixedly mounted with an inner gear ring 19 located inside the outer gear ring 17, and the outer side surface of the inner gear ring 19 is meshed with the inner surface of the outer gear ring 17 through a circular gear 20. The outer end of the outer gear ring 17 extends out of the shielding cover 2, the first gear set 18 is rotatably mounted on the outer side of the shielding cover 2, and the inner gear ring 19 is rotatably mounted inside the shielding cover 2.

[0044] The outer gear ring 17 cooperates with the first gear set 18 to effectively connect the three outer air ducts 8 and realize synchronous reverse rotation of the three outer gear rings 17. During the rotation of the outer gear ring 17, the outer air duct 8 is driven to rotate by the circular gear 20 and the inner gear ring 19.

[0045] In another relatively specific embodiment, Figure 2 As shown, both sides of the shielding cover 2 are rotatably mounted with running wheels 21, and a second gear set 22 is fixedly mounted on the inner side of the running wheel 21, and the second gear set 22 is meshed with the outer gear ring 17 at the rear end. When the frame 1 moves forward, the running wheels 21 support the shielding cover 2 and roll on the ground. While the running wheels 21 roll, they drive the second gear set 22 to drive the outer gear ring 17 at the rear end to rotate, thereby making the rotation direction of the outer air duct 8 at the rear end opposite to the rolling direction of the running wheels 21. At this time, the rotation direction of the outer air duct 8 in the middle is the same as the rotation direction of the running wheels 21, while the rotation direction of the outer air duct 8 at the front end is opposite to the rotation direction of the running wheels 21.

[0046] Through the above arrangement, when the channel openings 9 in the frontmost and rearmost external air ducts 8 pass through the air outlet 5, the road surface is swept forward in turn, and the rear air is drawn in when the channel openings 9 in the middle external air duct 8 passes through the air inlet 7; when the channel openings 9 in the middle external air duct 8 pass through the air outlet 5, they are swept forward, and air is drawn in when the channel openings 9 in the frontmost and rearmost external air ducts 8 pass through the air inlet 7; the mutual coordination of the sweeping and suction processes between adjacent external air ducts 8 is achieved to improve the road cleaning effect.

[0047] The width of the air outlet 5 and the air inlet 7 are both greater than the width of the road markings, the length of the passage 9 is greater than the width of the air outlet 5 and the air inlet 7, and the length of the wind shield 10 is adapted to the length of the passage 9. In this way, the airflow blown out from the air outlet 5 can cover the width of the road markings, thereby improving the road cleaning effect.

[0048] In a relatively specific implementation manner, Figure 5 , Fig.11As shown, the inner end of the wind shield 10 is provided with an inner rotating shaft 23, and the inner rotating shaft 23 is rotatably installed on the inner wall of the passage opening 9. The outer sides of the two side ends of the wind shield 10 are provided with outer hinge joints 24, and a pull rod 25 is sleeved on the outer hinge joint 24. The inner end of the pull rod 25 is rotatably connected with a pull block 26, and the pull block 26 is slidably installed on the end of the outer side surface of the inner air duct 3. The pull block 26 drives the wind shield 10 to swing through the pull rod 25 and controls the passage opening 9 to switch between the maximum state and the minimum state.

[0049] According to this embodiment, when the wind shield 10 is installed on the passage opening 9 through the inner rotating shaft 23, the outer end of the wind shield 10 can swing around the inner rotating shaft 23. When the pull rod 25 moves inward, the angle between the two pull rods 25 will become smaller. At this time, the outer ends of the two wind shields 10 will swing relative to each other to reduce the distance between the passage opening 9, increase the pressure of the wind flow when it is blown out, and improve the sweeping accuracy after the wind flow is blown out.

[0050] During the rotation of the outer air duct 8, the pull block 26 is driven to make a circular motion through the wind shield 10 and the pull rod 25. Figure 7 As shown, an annular groove 27 is provided at both ends of the outer side surface of the inner air duct 3, a guide groove 28 is provided on the side wall of the annular groove 27, and guide rods 29 are rotatably installed on both sides of the pull block 26, and the guide rods 29 are slidably arranged in the guide groove 28, and the pull block 26 is located in the annular groove 27. When the pull block 26 makes a circular motion, it will move in the annular groove 27, and drive the guide rod 29 to move in the guide groove 28. The guide groove 28 guides the pull block 26, and then uses the pull block 26 and the pull rod 25 to control the swing of the windshield 10.

[0051] Specifically, if Figure 7 As shown, the guide groove 28 includes a front portion 28.1 and a rear portion 28.2 distributed front to back, and an upper portion 28.3 and a lower portion 28.4 connecting the upper and lower ends of the front portion 28.1 and the rear portion 28.2, wherein the front portion 28.1 and the rear portion 28.2 are both arc-shaped, and the diameter of the front portion 28.1 is larger than the diameter of the rear portion 28.2, and a lower closed area 30 is provided between the bottom of the air inlet 7 and the bottom end of the air outlet 5, and the width of the lower closed area 30 is larger than the width of the channel opening 9.

[0052] When the guide rod 29 moves in the front part 28.1, the outer ends of the two wind deflectors 10 are in a state of facing each other, at this time, the passage opening 9 is in a maximum state. When the guide rod 29 moves in the rear part 28.2, the outer ends of the two wind deflectors 10 are in a state of facing each other, at this time, the passage opening 9 is in a minimum state. When the guide rod 29 moves from the front part 28.1 through the upper part 28.3 to the rear part 28.2, the outer ends of the two wind deflectors 10 swing in opposite directions, so that the passage opening 9 switches from the maximum state to the minimum state. When the guide rod 29 moves from the rear part 28.2 through the lower part 28.4 to the front part 28.1, the outer ends of the two wind deflectors 10 swing in opposite directions, so that the passage opening 9 switches from the minimum state to the maximum state.

[0053] The channel opening 9 on the frontmost and rearmost external air duct 8 passes through the lower closed area 30 in a clockwise direction. As the channel opening 9 approaches the edge of the lower closed area 30, the opening area of ​​the channel opening 9 gradually becomes smaller, which can improve the suction effect, improve the road cleaning effect and efficiency, and at the same time, improve the effect of marking spraying.

[0054] An upper closed area 31 is provided between the air inlet 7 and the top of the air outlet 5 to reduce the inflow and outflow at the upper part. Fig.10 As shown, the inner top wall of the shielding cover 2 is provided with an arc-shaped guide surface 32 in the area between two adjacent external air ducts 8, and the two ends of the arc-shaped guide surface 32 can respectively connect with two adjacent channel openings 9 in an upward state. With such a configuration, for two adjacent external air ducts 8, when the channel opening 9 corresponding to the air inlet 7 located at the front side is in an inclined upward state, the channel opening 9 corresponding to the air outlet 5 located at the rear side is also in an inclined upward state. At this time, the upper airflow can be more effectively sucked into the air inlet 7 through the guiding effect of the arc-shaped guide surface 32, which helps to improve the dust suction effect.

[0055] In another preferred embodiment, Figure 3 As shown, the external fixed sleeve of the outer air duct 8 is provided with a cleaning brush 33, and the cleaning brush 33 is provided with an opening 34 at the position corresponding to the channel opening 9. The cleaning brush 33 can effectively clean the road surface and the inner top wall of the shielding cover 2 during the rotation of the outer air duct 8, thereby improving the cleaning effect of impurities and dust. At the same time, during the process of blowing the channel opening 9 toward the ground, the cleaning brush 33 can separate the road surface, preventing the airflow blown out of the rear channel opening 9 from blowing impurities and dust to the area between the front outer air duct 8 and the middle outer air duct 8, thereby reducing interference and improving the road surface cleaning effect.

[0056] In summary, the road marking device provided in the embodiment of the present invention, on the one hand, uses the shielding cover 2 to relatively separate the road surface to be sprayed with markings from the external environment, reducing the interference of dust in the external environment with the effect of spraying markings; on the other hand, the relatively closed-loop circulation of the airflow is used to cooperate with filtration to achieve the collection and filtration of impurities and dust while ensuring that the purged air contains less impurities and dust, thereby improving the pavement purging effect. In addition, the coordination of purging and suction is used to timely collect the dust and impurities generated in the shielding cover 2 after purging.

[0057] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A road marking device, comprising a frame (1) and a nozzle arranged on one side of the frame (1), characterized in that: A shielding cover (2) is provided on one side of the vehicle frame (1); the nozzle is located at the rear end of the inner cavity of the shielding cover (2); and three inner air ducts (3) are provided in the shielding cover (2); The front half of the cavity of the inner air duct (3) is a blowing cavity (4), and an air outlet (5) is arranged on the front side of the blowing cavity (4); the rear half of the cavity of the inner air duct (3) is a suction cavity (6), and an air inlet (7) is arranged on the rear side of the suction cavity (6); The outer rotating sleeve of the inner air duct (3) is provided with an outer air duct (8), and two adjacent outer air ducts (8) rotate synchronously in opposite directions. A plurality of passage openings (9) are arranged on the outer air duct (8) at equal intervals, and swingable wind shields (10) are arranged on both sides of the passage opening (9). The two wind shields (10) swing relative to or away from each other at their outer ends so that the outer end size of the passage opening (9) is in a minimum state or a maximum state. When the passage opening (9) passes through the air outlet (5) or the air inlet (7), it is in a minimum state and a maximum state respectively, and the passage openings (9) on the two adjacent outer air ducts (8) are in a state of counter-rotation.

2. The road marking device according to claim 1, characterized in that: The three blowing chambers (4) are connected in sequence via a first air duct (11), and the first air duct (11) located at the most upstream in the direction of air flow movement is connected to a blower (12); the three suction chambers (6) are connected in sequence via a second air duct (13), and the second air duct (13) located at the most downstream in the direction of air flow movement is connected to an exhaust fan (14); the exhaust end of the exhaust fan (14) and the air inlet end of the blower (12) are connected via a third air duct (15), and a filter tube (16) is provided in the third air duct (15).

3. The road marking device according to claim 1 or 2, characterized in that: An outer toothed ring (17) is rotatably mounted on the side surface of the shielding cover (2) corresponding to each outer air duct (8), two adjacent outer toothed rings (17) are meshed with each other via a first gear set (18), the end of the outer air duct (8) is fixedly mounted with an inner toothed ring (19) located inside the outer toothed ring (17), and the outer side surface of the inner toothed ring (19) is meshed with the inner surface of the outer toothed ring (17) via a circular gear (20).

4. The road marking device according to claim 3, characterized in that: Travel wheels (21) are rotatably mounted on both sides of the shielding cover (2), a second gear set (22) is fixedly mounted on the inner side of the travel wheel (21), and the second gear set (22) is meshed with the outer gear ring (17) at the rearmost side.

5. The road marking device according to claim 1 or 4, characterized in that: The widths of the air outlet (5) and the air inlet (7) are both greater than the width of the road marking, the length of the passage opening (9) is greater than the widths of the air outlet (5) and the air inlet (7), and the length of the wind shield (10) is compatible with the length of the passage opening (9).

6. The road marking device according to claim 5, characterized in that: An inner rotating shaft (23) is provided at the inner end of the wind shield (10), and the inner rotating shaft (23) is rotatably mounted on the inner wall of the passage opening (9). External hinge joints (24) are provided on the outer sides of both side ends of the wind shield (10), and a pull rod (25) is sleeved on the external hinge joint (24). The inner end of the pull rod (25) is rotatably connected to a pull block (26), and the pull block (26) is slidably mounted on the end of the outer side surface of the inner air duct (3). The pull block (26) drives the wind shield (10) to swing through the pull rod (25) and controls the passage opening (9) to switch between a maximum state and a minimum state.

7. The road marking device according to claim 6, characterized in that: Both ends of the outer side surface of the inner air duct (3) are provided with annular grooves (27), and the side walls of the annular groove (27) are provided with guide grooves (28). Guide rods (29) are rotatably mounted on both side surfaces of the pull block (26), and the guide rods (29) are slidably arranged in the guide grooves (28). The pull block (26) is located in the annular groove (27).

8. The road marking device according to claim 7, characterized in that: The guide groove (28) comprises a front portion (28.1) and a rear portion (28.2) distributed front to back, and an upper portion (28.3) and a lower portion (28.4) connecting the upper and lower ends of the front portion (28.1) and the rear portion (28.2); wherein the front portion (28.1) and the rear portion (28.2) are both arc-shaped, and the diameter of the front portion (28.1) is greater than the diameter of the rear portion (28.2).

9. A road marking device according to claim 8, characterized in that: An arc-shaped guide surface (32) is provided in a region of the inner top wall of the shielding cover (2) located between two adjacent outer air ducts (8).

10. A road marking device according to claim 1 or 9, characterized in that: The external fixed sleeve of the external air duct (8) is provided with a cleaning brush (33), and the cleaning brush (33) is provided with an opening (34) at a position corresponding to the channel opening (9).

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