A municipal road marking device

Abstract

This invention discloses a municipal road marking device, including a glass microbead spreading unit on a hot-melt road marking vehicle. The glass microbead spreading unit can spread glass microbeads along the direction of travel onto the surface of the newly formed straight road marking that is still in a molten state. The downward spreading rate of the glass microbeads by the glass microbead spreading unit is adapted to the forward speed of the hot-melt road marking vehicle, thus avoiding the problem of uneven spreading.

Description

Technical Field

[0001] This invention belongs to the field of road markings. Background Technology

[0002] Glass microspheres have excellent light scattering properties, so a certain amount of glass microspheres are added to road marking paint to enhance the light reflection effect of road markings, so that the markings can be clearly displayed on the road at night, thus making it easier for drivers to identify them.

[0003] Since the reflection effect is limited to the surface of the road marking, in order to enhance its reflection effect, glass microsphere powder is additionally spread on the surface of the newly formed molten road marking during the construction process. Since the speed of the road marking construction vehicle is not always constant, and the device for uniformly spreading glass microsphere powder runs synchronously with the road marking construction vehicle, for example, if the speed of the road marking construction vehicle is high, and the spreading speed of glass microsphere powder does not increase accordingly, it will cause the spreading to be too sparse.

[0004] Therefore, it is necessary to design a device or system in which the rate at which the glass microspheres are dispersed downward by the glass microsphere dispersing unit is adapted to or mutually restrained by the forward speed of the lane marking vehicle. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a municipal road marking device and working method, which can make the downward spreading rate of glass microbeads by the glass microbead spreading unit adapt to the forward speed of the marking vehicle.

[0006] Technical Solution: To achieve the above objectives, the present invention provides a municipal road marking device, comprising a hot-melt road marking vehicle. The hot-melt road marking vehicle includes a hot-melt paint coating unit and a glass microbead spreading unit, which are arranged front and rear. The glass microbead spreading unit can spread glass microbeads along the direction of travel onto the surface of the newly formed, still molten, straight road marking. The downward spreading rate of the glass microbeads by the glass microbead spreading unit is adapted to the forward speed of the hot-melt road marking vehicle.

[0007] Furthermore, the glass microsphere dispensing unit includes a structural arm fixed to the frame of a hot-melt road marking vehicle, on which a vertical glass microsphere container is fixedly installed. The glass microsphere container contains a vertically penetrating glass microsphere cavity. Below the glass microsphere container is a dispensing roller, and two rollers are coaxially and synchronously arranged on both sides of the dispensing roller. The two rollers roll on both sides of the road straight marking that has been formed and is waiting to solidify.

[0008] Furthermore, the bearing sleeves of both rollers are coaxially mounted on the central shaft; both ends of the central shaft are fixed to one side of the glass microsphere container via fixed arms; the lower end of the glass microsphere container is an upper concave arc surface, which is adapted to and slides in cooperation with the outer wall surface of the dispensing roller.

[0009] Furthermore, a side-notched iron column with a notched circular cross-section is coaxially arranged inside the batching drum. The side-notched iron column is coaxially and integrally connected with the middle section of the central shaft. A non-magnetic arc plate is coaxially fixed at the side notch in front of the side-notched iron column. The outer arc surface of the arc plate and the outer arc surface of the side-notched iron column are just spliced ​​together to form a complete cylindrical surface.

[0010] Furthermore, the dispensing roller has several rows of dispensing holes arranged in a circular array. The dispensing holes in each row are equidistantly distributed along the axis of the dispensing roller. A permanent magnet column moves through each dispensing hole coaxially. Several permanent magnet columns in the same row of dispensing holes are fixedly connected to each other by several connecting strips to form a row of permanent magnet columns.

[0011] Furthermore, each permanent magnet column has a cover plate fixedly connected to the end away from the axis of the dispensing roller via a connecting column, forming a powder transfer gap between the cover plate and the permanent magnet column; the end of each permanent magnet column near the axis of the dispensing roller is set as an arc protrusion. When the arc protrusion of the permanent magnet column slides tangentially to the complete cylindrical surface, the cover plate connected to the other end of the permanent magnet column just seals the end of the dispensing hole away from the axis of the dispensing roller, thus sealing the powder transfer gap inside the dispensing hole; when the permanent magnet column is below the side-notched iron column, the outer arc surface of the iron side-notched iron column has a sufficient upward magnetic attraction force to overcome gravity, so that the arc protrusion of the permanent magnet column below the side-notched iron column remains tangentially to the complete cylindrical surface.

[0012] Furthermore, a longitudinal powder descent tube is installed below the front of the batching roller, with the lower end of the powder descent tube maintaining a distance from the straight road markings that have formed and are waiting to solidify directly below; the inside of the powder descent tube is a powder descent channel.

[0013] Furthermore, from the perspective of the feed roller's axis, a first virtual ray, a second virtual ray, a third virtual ray, and a fourth virtual ray are defined with the feed roller's axis as the ray endpoint;

[0014] The first virtual ray is vertically upward, the second virtual ray is deviated 36° clockwise from the first virtual ray along its endpoint; the third virtual ray is deviated 72° counterclockwise from the first virtual ray along its endpoint, and the fourth virtual ray is deviated 36° counterclockwise from the third virtual ray along its endpoint.

[0015] On the inner side of the arc plate: a first group of electromagnets is arranged in the direction of the second virtual ray, a second group of electromagnets is arranged in the direction of the first virtual ray, a third group of electromagnets is arranged in the direction of the third virtual ray, and a fourth group of electromagnets is arranged in the direction of the fourth virtual ray; the first group of electromagnets, the second group of electromagnets, the third group of electromagnets and the fourth group of electromagnets are fixed to the side notch iron column by their respective supports;

[0016] As the batching drum rotates counterclockwise along its axis, each permanent magnet column will successively align with the first group of electromagnets, the second group of electromagnets, the third group of electromagnets, and the fourth group of electromagnets.

[0017] Furthermore, when the permanent magnet column is coaxially aligned with the first set of electromagnets, the energization of the first set of electromagnets causes the first set of electromagnets to generate a repulsive force on the permanent magnet column.

[0018] When the permanent magnet column is coaxially aligned with the second set of electromagnets, the energization of the second set of electromagnets causes the second set of electromagnets to form a magnetic attraction force on the permanent magnet column.

[0019] When the permanent magnet column is coaxially aligned with the third set of electromagnets, the energization of the third set of electromagnets causes the third set of electromagnets to generate a repulsive force on the permanent magnet column.

[0020] When the permanent magnet column is aligned with the fourth set of electromagnets on the same axis, the energization of the fourth set of electromagnets causes the fourth set of electromagnets to exert a magnetic attraction force on the permanent magnet column.

[0021] Beneficial effects: During the counterclockwise rotation of the mixing roller of the present invention, when any permanent magnet column reaches the front position of the mixing roller, the powder transfer gap filled with glass microsphere powder at one end of the permanent magnet column will be exposed on the front side of the mixing roller and fall into the powder descent channel once; the faster the mixing roller rotates, the more glass microsphere powder falls into the powder descent channel per unit time; and the rotation speed of the mixing roller is consistent with the rotation speed of the roller, thus achieving the purpose of synchronously increasing or decreasing the downward spreading rate of glass microspheres by the glass microsphere spreading unit and the forward speed of the glass microsphere spreading unit, so that the downward spreading rate of glass microspheres by the glass microsphere spreading unit is adapted to the forward speed of the hot melt road marking vehicle, achieving the purpose of uniform spreading of glass microsphere powder. Attached Figure Description

[0022] Appendix Figure 1 This is a schematic diagram of the overall scheme;

[0023] Appendix Figure 2 Schematic diagram of the glass microsphere dispensing unit moving forward;

[0024] Appendix Figure 3 A side sectional view of the glass microsphere dispensing unit;

[0025] Appendix Figure 4 For the appendix Figure 3 A schematic diagram of direction A;

[0026] Appendix Figure 5 An explosion diagram of a glass microsphere dispensing unit;

[0027] Appendix Figure 6 For the appendix Figure 5 An enlarged view of mark 13;

[0028] Appendix Figure 7 For the appendix Figure 5 An enlarged view of mark 6;

[0029] Appendix Figure 8 For the appendix Figure 5 An enlarged view of mark 12;

[0030] Appendix Figure 9 This is a schematic diagram of a side-notch iron column structure. Detailed Implementation

[0031] The invention will now be further described with reference to the accompanying drawings.

[0032] As attached Figures 1 to 9 A type of municipal road marking device, such as Figure 1 and Figure 2 The system includes a hot-melt road marking vehicle capable of traveling in a straight line along the road. The hot-melt road marking vehicle includes a hot-melt paint coating unit 16 and a glass microsphere spreading unit 14. The hot-melt paint coating unit 16 and the glass microsphere spreading unit 14 are arranged one after the other and move forward synchronously with the hot-melt road marking vehicle. As the hot-melt paint coating unit 16 moves forward with the hot-melt road marking vehicle, it applies hot-melt paint to the surface of the road 17 in the direction of travel, forming a straight road marking 18 that is waiting to solidify. At the same time, the glass microsphere spreading unit 14, which moves synchronously with the hot-melt paint coating unit 16, spreads glass microspheres in the direction of travel onto the surface of the newly formed straight road marking 18 that is still in a molten state.

[0033] The main objective of this solution is to ensure that the downward dispersal rate of glass microspheres by the glass microsphere dispersing unit 14 is compatible with the forward speed of the hot-melt road marking vehicle; the specific solution is as follows:

[0034] like Figure 2 The glass microsphere dispensing unit 14 includes a structural arm 15 fixed on the frame of a hot-melt road marking vehicle. A vertical glass microsphere container 23 is fixedly installed on the structural arm 15. The glass microsphere container 23 contains a glass microsphere cavity 5 that runs vertically through the interior. Below the glass microsphere container 23 is a dispensing roller 9. Two rollers 37 are coaxially and synchronously arranged on both sides of the dispensing roller 9. The two rollers 37 roll on both sides of the road straight marking 18 that has been formed and is waiting to solidify. The dispensing roller 9 is located directly above the road straight marking 18 that has been formed and is waiting to solidify.

[0035] like Figure 6 Inside the roller 37, bearing sleeves 39 are coaxially fixedly connected to several spokes 38. One side of each spoke 38 is fixed to the side end of the dispensing roller 9 via a connector 36, thereby achieving synchronization between the dispensing roller 9 and the two rollers 37. The bearing sleeves 39 of both rollers 37 are coaxially rotatably mounted on the central shaft 24 via bearings. Both ends of the central shaft 24 are fixed to one side of the glass microsphere container 23 via fixing arms 21. Figure 7 The lower end of the glass microsphere container 23 is an upper concave arc surface 22, which is adapted to and slides in conjunction with the outer cylinder wall surface 9.1 of the dispensing roller 9.

[0036] like Figure 3 , 4 9; Inside the feeding roller 9, there is a side-notched iron column 10 with a notched circular cross-section. The side-notched iron column 10 is coaxially and integrally connected with the middle section of the central shaft 24. A non-magnetic arc plate 7 is coaxially fixed at the side notch in front of the side-notched iron column 10. The outer arc surface of the arc plate 7 and the outer arc surface of the side-notched iron column 10 are just spliced ​​together to form a complete cylindrical surface 8.

[0037] like Figure 4 and 6 The dispensing roller 9 has several rows of dispensing holes 35 arranged in a circular array. The dispensing holes 35 in each row are equidistantly distributed along the axial direction of the dispensing roller 9. A permanent magnet column 31 moves through each dispensing hole 35 coaxially. The permanent magnet columns 31 in the same row of dispensing holes 35 are fixedly connected to each other by several connecting strips 30 to form a row of permanent magnet columns 25.

[0038] like Figure 8 Each permanent magnet column 31 has a cover plate 28 coaxially fixed at one end away from the axis of the dispensing roller 9 via a connecting column 27, forming a powder transfer gap 26 between the cover plate 28 and the permanent magnet column 31; each permanent magnet column 31 has an arc protrusion 29 at one end near the axis of the dispensing roller 9, and when the arc protrusion 29 of the permanent magnet column 31 slides tangentially to the complete cylindrical surface 8, the cover plate 28 connected to the other end of the permanent magnet column 31 just seals the end of the dispensing hole 35 away from the axis of the dispensing roller 9, thus sealing the powder transfer gap 26 within the dispensing hole 35; Figure 4 When the permanent magnet column 31 is below the side-notched iron column 10, the outer arc surface of the iron side-notched iron column 10 has an upward magnetic attraction force sufficient to overcome gravity on the permanent magnet column 31, so that the arc protrusion 29 of the permanent magnet column 31 below the side-notched iron column 10 remains tangential to the complete cylindrical surface 8.

[0039] like Figure 3 , 47; A longitudinal powder descending pipe 1 is provided below the front of the batching roller 9. The lower end of the powder descending pipe 1 is spaced from the straight road marking 18 that has been formed and is waiting to solidify directly below. The powder descending pipe 1, which has a rectangular cross section, contains a powder descending channel 3. Three descending vibrating screens 2 are provided from top to bottom in the powder descending channel 3. Each descending vibrating screen 2 has descending screen holes 64 evenly distributed on it. The powder descending pipe 1 is fixedly connected to the side wall of the glass microsphere container 23 through the vibrating wall 20. The vibrating wall 20 is equipped with a vibrator 19.

[0040] like Figure 4 From the perspective of the axis of the batching roller 9, the first virtual ray 4.1, the second virtual ray 4.2, the third virtual ray 4.3 and the fourth virtual ray 4.4 are defined with the axis of the batching roller 9 as the ray endpoint;

[0041] The first virtual ray 4.1 is oriented vertically upwards; the second virtual ray 4.2 is deviated clockwise by 36° relative to the first virtual ray 4.1 along its endpoint; the third virtual ray 4.3 is deviated counterclockwise by 72° relative to the first virtual ray 4.1 along its endpoint; and the fourth virtual ray 4.4 is deviated counterclockwise by 36° relative to the third virtual ray 4.3 along its endpoint.

[0042] On the inner side of the arc plate 7: a first group of electromagnets 11a is provided in the direction of the second virtual ray 4.2, a second group of electromagnets 11b is provided in the direction of the first virtual ray 4.1, a third group of electromagnets 11c is provided in the direction of the third virtual ray 4.3, and a fourth group of electromagnets 11d is provided in the direction of the fourth virtual ray 4.4; the first group of electromagnets 11a, the second group of electromagnets 11b, the third group of electromagnets 11c and the fourth group of electromagnets 11d are fixed to the inner side of the side notch of the side notch iron column 10 through their respective supports 41;

[0043] During the counterclockwise rotation of the feeding drum 9 along the axis, each permanent magnet column 31 will successively correspond to the first group of electromagnets 11a, the second group of electromagnets 11b, the third group of electromagnets 11c and the fourth group of electromagnets 11d.

[0044] When the permanent magnet column 31 is coaxially aligned with the first set of electromagnets 11a, the energization of the first set of electromagnets 11a causes the first set of electromagnets 11a to generate a repulsive force on the permanent magnet column 31, causing the permanent magnet column 31 to move away from the first set of electromagnets 11a. This causes the cover plate 28 at one end of the permanent magnet column 31 to be pushed out of the feeding hole 35 to the bottom of the glass microsphere cavity 5, and the powder transfer gap 26 to connect with the glass microsphere cavity 5.

[0045] When the permanent magnet column 31 is coaxially aligned with the second set of electromagnets 11b, the energization of the second set of electromagnets 11b causes the second set of electromagnets 11b to form a magnetic attraction force on the permanent magnet column 31, causing the permanent magnet column 31 to move closer to the second set of electromagnets 11b. This causes the cover plate 28 at one end of the permanent magnet column 31 to retract from the bottom of the glass microsphere cavity 5 back into the feeding hole 35, until the arc protrusion 29 of the permanent magnet column 31 slides tangentially to the complete cylindrical surface 8 again.

[0046] When the permanent magnet column 31 is coaxially aligned with the third set of electromagnets 11c, the energization of the third set of electromagnets 11c causes the third set of electromagnets 11c to generate a repulsive force on the permanent magnet column 31, causing the permanent magnet column 31 to move away from the first set of electromagnets 11a. This causes the cover plate 28 at one end of the permanent magnet column 31 to be pushed out of the feeding hole 35 to the front side of the feeding roller 9, and exposes the powder transfer gap 26 to the front side of the feeding roller 9. The glass microspheres in the powder transfer gap 26 fall into the powder slow descent channel 3 under the action of gravity.

[0047] When the permanent magnet column 31 is coaxially aligned with the fourth set of electromagnets 11d, the energization of the fourth set of electromagnets 11d causes the fourth set of electromagnets 11d to form a magnetic attraction force on the permanent magnet column 31, causing the permanent magnet column 31 to move closer to the fourth set of electromagnets 11d. This causes the cover plate 28 at one end of the permanent magnet column 31 to retract from the bottom of the glass microsphere cavity 5 back into the feeding hole 35, until the arc protrusion 29 of the permanent magnet column 31 slides tangentially to the complete cylindrical surface 8 again.

[0048] Working principle:

[0049] As the hot melt paint coating unit 16 moves forward, it applies hot melt paint to the surface of the road 17 in the direction of travel, forming a molten road straight line marking 18 that is waiting to solidify. At the same time, the glass microsphere spreading unit 14, which moves synchronously with the hot melt paint coating unit 16, spreads glass microspheres along the direction of travel onto the surface of the newly formed road straight line marking 18 that is still in a molten state, thereby enhancing the reflective effect of the surface of the road straight line marking 18.

[0050] The dispersing process of the glass microsphere dispersing unit 14, and the principle by which the downward dispersing rate of the glass microspheres adapts to the forward speed of the hot-melt road marking vehicle, are as follows:

[0051] Initial settings: The first group of electromagnets 11a, the second group of electromagnets 11b, the third group of electromagnets 11c and the fourth group of electromagnets 11d are always energized, and at the same time, the vibration output from each vibrator 19 is continuously transmitted to each slow-falling vibrating screen 2.

[0052] Work process:

[0053] During the forward movement of the glass microsphere spreading unit 14, the two rollers 37 on the glass microsphere spreading unit 14 roll on both sides of the road straight marking 18 that has been formed and is waiting to solidify. The faster the glass microsphere spreading unit 14 moves forward, the faster the counterclockwise rotation speed of the two rollers 37 is.

[0054] During the counterclockwise rotation of the two rollers 37, the batching roller 9 will be driven to rotate counterclockwise in sync. During the counterclockwise rotation of the batching roller 9, the permanent magnet columns 31 on the batching roller 9 will periodically and successively correspond to the relatively stationary first group of electromagnets 11a, the second group of electromagnets 11b, the third group of electromagnets 11c, and the fourth group of electromagnets 11d.

[0055] Taking one of the permanent magnet columns 31 as the analysis target, during one cycle of the counterclockwise rotation of the feeding drum 9, this permanent magnet column 31 first aligns with the first set of electromagnets 11a. The first set of electromagnets 11a exerts a repulsive force on this permanent magnet column 31, causing the permanent magnet column 31 to move away from the first set of electromagnets 11a. This causes the cover plate 28 at one end of the permanent magnet column 31 to be pushed upward from the feeding hole 35 to the bottom of the glass microsphere cavity 5, and the powder transfer gap 26 to connect with the glass microsphere cavity 5. The glass microspheres in the glass microsphere cavity 5 automatically enter the powder transfer gap 26.

[0056] As the dispensing roller 9 continues to rotate counterclockwise, the permanent magnet column 31 begins to align with the second set of electromagnets 11b on the same axis. The second set of electromagnets 11b exerts a magnetic attraction on the permanent magnet column 31, causing the permanent magnet column 31 to move closer to the second set of electromagnets 11b. This causes the cover plate 28 at one end of the permanent magnet column 31 to retract from the bottom of the glass microsphere cavity 5 back into the dispensing hole 35, until the arc protrusion 29 of the permanent magnet column 31 slides tangentially to the complete cylindrical surface 8. At this point, the powder transfer gap 26 filled with glass microspheres retracts into the dispensing hole 35.

[0057] As the batching drum 9 continues to rotate counterclockwise, the permanent magnet column 31 begins to align with the third set of electromagnets 11c. The third set of electromagnets 11c exerts a repulsive force on the permanent magnet column 31, causing it to move away from the first set of electromagnets 11a. This pushes the cover plate 28 at one end of the permanent magnet column 31 out of the batching hole 35 to the front of the batching drum 9, exposing the powder transfer gap 26 to the front of the batching drum 9. The glass microspheres filled in the powder transfer gap 26 fall into the powder slow-falling channel 3 under the action of gravity. The glass microsphere powder falling into the powder slow-falling channel 3 is evenly dispersed in the powder slow-falling channel 3 under the high-frequency vibration of the three-layer slow-falling vibrating screen 2, and falls evenly onto the upper surface of the road straight line marking 18, which is still in a molten state, below the powder slow-falling tube 1.

[0058] As the dispensing roller 9 continues to rotate counterclockwise, when the permanent magnet column 31 begins to align with the fourth set of electromagnets 11d, the fourth set of electromagnets 11d exerts a magnetic attraction on the permanent magnet column 31, causing the permanent magnet column 31 to move closer to the fourth set of electromagnets 11d. This causes the cover plate 28 at one end of the permanent magnet column 31 to retract from the bottom of the glass microsphere cavity 5 back into the dispensing hole 35, until the arc protrusion 29 of the permanent magnet column 31 slides tangentially to the complete cylindrical surface 8 again.

[0059] Finally, as the batching roller 9 continues to rotate counterclockwise, the permanent magnet column 31 reaches below the side-notched iron column 10. The outer arc surface of the iron side-notched iron column 10 has a strong upward magnetic attraction force to overcome gravity, so that the arc protrusion 29 of the permanent magnet column 31 below the side-notched iron column 10 remains tangential to the complete cylindrical surface 8.

[0060] Referring to the above process, if all permanent magnet columns 31 are taken as the analysis target, during the counterclockwise rotation of the dispensing roller 9, when any permanent magnet column 31 reaches the front position of the dispensing roller 9, the powder transfer gap 26 filled with glass microsphere powder at one end of the permanent magnet column 31 will be exposed on the front side of the dispensing roller 9 and fall into the powder descent channel 3 once; the faster the dispensing roller 9 rotates, the more glass microsphere powder falls into the powder descent channel 3 per unit time; and the rotation speed of the dispensing roller 9 is consistent with the rotation speed of the roller 37, thus achieving the purpose of synchronously increasing or decreasing the downward dispensing rate of glass microspheres by the glass microsphere dispensing unit 14 and the forward speed of the glass microsphere dispensing unit 14, so that the downward dispensing rate of glass microspheres by the glass microsphere dispensing unit 14 is adapted to the forward speed of the hot melt road marking vehicle, achieving the purpose of uniform dispensing of glass microsphere powder.

[0061] Additionally, if it is necessary to pause the dispensing of glass microsphere powder without changing the forward displacement of the glass microsphere dispensing unit 14, it is only necessary to de-energize the first set of electromagnets 11a. In this way, in each cycle, there will be no situation where the cover plate 28 at one end of the permanent magnet column 31 is pushed upward from the feeding hole 35 to the bottom of the glass microsphere cavity 5, thus preventing the transfer of glass microsphere powder. This allows the dispensing process to be paused without stopping the hot-melt road marking vehicle from traveling along the road.

[0062] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A municipal road marking apparatus characterized by: The application relates to a hot-melt type road marking vehicle, which comprises a hot-melt paint coating unit (16) and a glass microsphere scattering unit (14), the hot-melt paint coating unit (16) and the glass microsphere scattering unit (14) are arranged in front of and behind each other, the glass microsphere scattering unit (14) can scatter glass microspheres on the upper surface of a straight road marking (18) which is just formed and is in a molten state along the advancing direction; the scattering speed of the glass microspheres by the glass microsphere scattering unit (14) is adapted to the advancing speed of the hot-melt type road marking vehicle. The application further comprises a glass microsphere container (23), the glass microsphere container (23) is internally provided with a glass microsphere containing cavity (5) which penetrates through the upper and lower portions; a dosing roller (9) is arranged below the glass microsphere container (23), and two rollers (37) are coaxially and synchronously arranged on the two sides of the dosing roller (9); the lower end of the glass microsphere container (23) is provided with an upper concave arc surface (22), the upper concave arc surface (22) is adapted to and slidably matched with the outer cylinder wall surface (9.1) of the dosing roller (9); a side notch iron column (10) with a notch circle section is coaxially arranged in the dosing roller (9), and a circular arc plate (7) made of non-magnetic material is coaxially and fixedly arranged at the front side notch of the side notch iron column (10); a plurality of dosing holes (35) are hollowed out in a circular array on the dosing roller (9), and a plurality of dosing holes (35) in each column of dosing holes (35) are equidistantly distributed along the axis direction of the dosing roller (9); each dosing hole (35) is coaxially movably penetrated by a permanent magnetic column (31), and a plurality of permanent magnetic columns (31) in the same column of dosing holes (35) are fixedly connected to form a column of permanent magnetic column groups (25) through a plurality of connecting strips (30); the end of each permanent magnetic column (31) away from the axis of the dosing roller (9) is coaxially fixedly connected with a cover disc (28) through a connecting column (27), and a powder transfer gap (26) is formed between the cover disc (28) and the permanent magnetic column (31); the end of each permanent magnetic column (31) close to the axis of the dosing roller (9) is provided with a circular arc protrusion (29), when the circular arc protrusion (29) of the permanent magnetic column (31) is slidably tangent to the complete cylindrical surface (8), the cover disc (28) connected to the other end of the permanent magnetic column (31) just seals the end of the dosing hole (35) away from the axis of the dosing roller (9), so that the powder transfer gap (26) is sealed in the dosing hole (35); under the axis visual angle of the dosing roller (9), a first virtual ray (4.1), a second virtual ray (4.2), a third virtual ray (4.3) and a fourth virtual ray (4.4) are defined with the axis center of the dosing roller (9) as the ray end point; on the inner side of the circular arc plate (7): a first group of electromagnets (11a) are arranged in the direction of the second virtual ray (4.2), a second group of electromagnets (11b) are arranged in the direction of the first virtual ray (4.1), a third group of electromagnets (11c) are arranged in the direction of the third virtual ray (4.3), and a fourth group of electromagnets (11d) are arranged in the direction of the fourth virtual ray (4.4). When the permanent magnet column (31) is coaxial with the first group of electromagnets (11a), the energization of the first group of electromagnets (11a) causes the first group of electromagnets (11a) to form a repulsive force on the permanent magnet column (31); When the permanent magnet column (31) is coaxial with the second group of electromagnets (11b), the energization of the second group of electromagnets (11b) causes the second group of electromagnets (11b) to form a magnetic attraction force on the permanent magnet column (31); When the permanent magnet column (31) is coaxial with the third group of electromagnets (11c), the energization of the third group of electromagnets (11c) causes the third group of electromagnets (11c) to form a repulsive force on the permanent magnet column (31); When the permanent magnet column (31) is coaxial with the fourth group of electromagnets (11d), the energization of the fourth group of electromagnets (11d) causes the fourth group of electromagnets (11d) to form a magnetic attraction force on the permanent magnet column (31).

2. The municipal road marking apparatus of claim 1, wherein: The glass bead scattering unit (14) further comprises a structural arm (15) fixed on the hot melt type road marking vehicle frame, a vertical glass bead container (23) is fixedly installed on the structural arm (15), and two rollers (37) roll on both sides of the formed road surface straight line marking (18) waiting to solidify.

3. The municipal road marking apparatus of claim 2, wherein: The bearing sleeves (39) of the two rollers (37) are coaxially rotatably installed on the center shaft (24) through bearings; the two ends of the center shaft (24) are fixed to one side of the glass bead container (23) through the fixed arms (21).

4. The municipal road marking apparatus of claim 3, wherein: The side notched iron column (10) is coaxially and integrally connected with the middle section of the center shaft (24), and the outer arc surface of the side notched iron column (10) is just spliced with the outer arc surface of the circular arc plate (7) to form a complete cylindrical surface (8).

5. The municipal road marking apparatus of claim 4, wherein: When the permanent magnet column (31) is below the side notched iron column (10), the outer arc surface of the iron material side notched iron column (10) has a sufficient upward magnetic attraction force to overcome the gravity of the permanent magnet column (31), so that the circular arc protrusion (29) of the permanent magnet column (31) below the side notched iron column (10) remains tangent to the complete cylindrical surface (8).

6. The municipal road marking apparatus of claim 5, wherein: A longitudinal powder slow descending pipe (1) is arranged below the front of the dosing roller (9), the lower end of the powder slow descending pipe (1) is spaced apart from the road surface straight line marking (18) formed below and waiting to solidify, and the powder slow descending pipe (1) is a powder slow descending channel (3).

7. A municipal road marking apparatus as claimed in claim 6, wherein: The first virtual ray (4.1) is vertically upward, the second virtual ray (4.2) is deviated by 36° clockwise along the ray end point relative to the first virtual ray (4.1), the third virtual ray (4.3) is deviated by 72° counterclockwise along the ray end point relative to the first virtual ray (4.1), and the fourth virtual ray (4.4) is deviated by 36° counterclockwise along the ray end point relative to the third virtual ray (4.3); The first group of electromagnets (11a), the second group of electromagnets (11b), the third group of electromagnets (11c) and the fourth group of electromagnets (11d) are fixed through respective supports (41) and the side notched iron column (10). During the rotation of the ingredient cylinder (9) along the axis counterclockwise, each permanent magnet column (31) is coaxially corresponded to the first group of electromagnets (11a), the second group of electromagnets (11b), the third group of electromagnets (11c) and the fourth group of electromagnets (11d) in turn.

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