CN114214911B - An automatic equidistant marking device for roads - Google Patents

Abstract

The invention relates to an automatic equidistant marking device for a road, which comprises a first shell and is characterized in that a wheel is arranged on the left side of the first shell, a second shell is fixed at the right lower end of a cavity of the first shell, a first cavity is formed at the left upper end of the second shell, a first piston plate is arranged in the first cavity, the wheel can drive the first piston plate to move up and down, a second cavity is formed at the right upper end of the second shell, a third cavity is formed at the lower end of the second shell, the third cavity is communicated with the first cavity, a baffle is arranged at the lower end of a communication port, the lower end of the third cavity is communicated with the outside and is provided with an smearing head, a vertical rod is fixed at the lower end of the first piston plate, a tension spring is fixed between the lower end of the vertical rod and the upper end face of the smearing head, a discharge opening is formed at the lower end face of the smearing head, and the discharge opening is formed when the lower end face of the smearing head contacts the ground; according to the invention, the first piston plate can periodically move downwards and reset through the cooperation of the grooved pulley mechanism, equidistant scribing can be realized without manual measurement, and the scribing efficiency is greatly improved.

Description

An automatic equidistant marking device for roads

technical field

The invention relates to the field of road construction, in particular to an automatic equidistant marking device for roads.

Background technique

During the construction of municipal roads, it is often necessary to mark the road surface. Because the marking time is long and the marking interval is not easy to ensure that it is completely consistent, the amount of man-hours is large, and the marking efficiency is low. Therefore, marking equipment is usually used to assist marking. However, due to the auxiliary The spraying speed of the scribing equipment is constant, and it is impossible to achieve an absolutely uniform spraying speed by artificially pushing the device forward. The spraying is shallow at a fast moving speed, and the spraying is deep at a fast moving speed. It is difficult to achieve uniform spraying, which affects the appearance and quality of the scribing finished product.

Contents of the invention

In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an automatic equidistant marking device for roads, which solves the problem of uneven spraying and low efficiency when marking roads.

The technical solution is to include a first casing, the first casing is a rectangular casing, a wheel is fixed on the first casing, and a dial is arranged in the middle of the first casing, and the rotation of the wheel can drive the dial The wheel rotates, there is a grooved wheel above the dial, a short rod is fixed on the front side of the dial, and a through groove is opened in the radial direction on the grooved wheel. When the dial rotates, the short rod is inserted into the through groove to drive the grooved wheel to rotate at a certain angle. After the short rod breaks away from the through groove, the sheave resets. The lower right end of the first housing cavity is fixed with the second housing, and the upper left end of the second housing is provided with a first cavity. There is a first piston in the first cavity that can slide up and down. The rotation of the groove wheel can drive the first piston plate to move up and down; the upper right end of the second housing is provided with a second cavity, which communicates with the lower end of the first cavity, and the position of the communication port is fixed with a one-way valve. The directional valve allows the material in the second chamber to flow into the first chamber only in one direction;

The lower end of the second housing is provided with a third cavity, the upper end of the third cavity communicates with the bottom of the first cavity, and there is a baffle at the lower end of the communication port between the first cavity and the third cavity, the baffle can move up and down and is always protected With upward pulling force, the upward movement of the baffle can block the communication port between the first cavity and the third cavity. The lower end of the third cavity communicates with the outside of the first housing. There is a smear head at the lower end of the third cavity, and the smear head is the upper end The shell is open and can slide up and down along the third cavity. The lower end of the first piston plate is fixed with a vertical rod passing through the baffle plate and the upper surface of the applicator head. The lower end of the vertical rod is fixed with a stopper. The stopper and the applicator head A tension spring is fixed between the upper ends, and the lower end of the applicator head is provided with a discharge port, when the lower end face of the applicator head touches the ground, the discharge port is opened, and when the lower end face of the applicator head is separated from the ground, the discharge port is closed;

The right end of the third cavity is provided with a fourth cavity which communicates with the third cavity. There is a second piston plate which can slide left and right in the fourth cavity. The right end of the second piston plate is fixed with a spring, and the other end of the spring is fixed at the Four-cavity right end face;

The discharge port is a straight notch opened along the front and rear directions, and there is a slider that can slide up and down in the discharge port. The lower end of the block is provided with a blind hole, and the bottom of the blind hole is provided with a horizontal hole that runs through the left and right end faces of the slider. The lower end of the slider is fixed with a spring, and the other end of the spring is fixed on the lower end of the applicator head. The spring keeps the slider relative to the applicator head. Under the lower force, the front and rear ends of the slider are located under the smear head and respectively rotated to connect with a pulley, and the lower end surface of the pulley is lower than the lower end surface of the slider;

A stirring rod is rotatably connected in the second cavity, the stirring rod is placed vertically and the outer edge surface is fixed with several horizontal straight rods, the upper end of the stirring rod extends out of the second housing and the upper end of the stirring rod has a horizontal front and back direction The fourth rotating shaft is meshed with the stirring rod through a bevel gear, a second pulley is fixed on the second rotating shaft and the fourth rotating shaft, and a second belt is meshed on the outer edge of the two second pulleys, the second rotating shaft and the second rotating shaft The four rotating shafts rotate synchronously through the second belt.

The invention cooperates with the groove wheel mechanism to make the first piston plate move downward and reset periodically, which can realize equidistant marking without manual measurement, and the vertical rod drives the smear head to move so that the smear head is only under the first piston plate Time-shifted marking ensures marking accuracy.

Description of drawings

Fig. 1 is a front appearance view of the present invention.

Fig. 2 is a front sectional view of the present invention.

Fig. 3 is a partial front sectional view when the first piston plate of the present invention moves downward.

Fig. 4 is a partial front sectional view of the first piston plate moved to the lowermost end of the first cavity in the present invention.

Fig. 5 is a partial enlarged view of A in Fig. 2 of the present invention.

Fig. 6 is a partially enlarged view of B in Fig. 3 of the present invention.

Fig. 7 is a part diagram of the second casing of the present invention.

Fig. 8 is a front view of the first pulley, the first belt, the second pulley and the second belt of the present invention.

Fig. 9 is a top view of the first rotating shaft, the second rotating shaft and the fourth rotating shaft of the present invention.

Fig. 10 is a top view of the third rotating shaft of the present invention.

Fig. 11 is a perspective view of the slider of the present invention.

Implementation

The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

From Figures 1 to 11, the present invention includes a first housing 1, the first housing 1 is a rectangular housing, the first housing 1 is fixed with a wheel 2, and there is a dial 10 in the middle of the first housing 1, The rotation of wheel 2 can drive the dial wheel 10 to rotate. There is a grooved wheel 11 above the dial 10. The front side of the dial 10 is fixed with a short rod 15. The grooved wheel 11 is provided with a through groove 16 radially. When the dial 10 rotates, Insert the short rod 15 into the through groove 16 to drive the sheave 11 to rotate at a certain angle. After the short rod 15 breaks away from the through groove 16, the sheave 11 resets. The lower right end of the first housing 1 cavity is fixed with the second housing 4. The upper left end of the housing 4 is provided with a first cavity 6, in which there is a first piston plate 9 that can slide up and down, and the rotation of the sheave 11 can drive the first piston plate 9 to move up and down; the upper right of the second housing 4 The end is provided with a second cavity 7, the second cavity 7 communicates with the lower end of the first cavity 6, and the position of the communication port is fixed with a check valve 27, which makes the material in the second cavity 7 only one-way. flow into the first cavity 6;

The lower end of the second housing 4 is provided with a third cavity 8, the upper end of the third cavity 8 communicates with the bottom of the first cavity 6, and there is a baffle plate 17 at the lower end of the communication port between the first cavity 6 and the third cavity 8. The plate 17 can move up and down and is always subject to an upward pull. The upward movement of the baffle plate 17 can block the communication port between the first cavity 6 and the third cavity 8. The lower end of the third cavity 8 communicates with the outside of the first housing 1. There is a smear head 20 at the lower end of the three chambers 8, the smear head 20 is a shell with an upper end opening, and can slide up and down along the third cavity 8, and a penetrating baffle plate 17 and the upper end of the smear head 20 are fixed on the lower end of the first piston plate 9. The vertical rod 31 on the end surface, the lower end of the vertical rod 31 is fixed with a stopper 32, and a tension spring is fixed between the stopper 32 and the upper surface of the applicator head 20, and the lower end surface of the applicator head 20 is provided with a discharge port 21, when the applicator head 20 When the lower end surface touches the ground, the discharge port 21 is opened, and when the lower end surface of the applicator head 20 is separated from the ground, the discharge port 21 is closed;

The right end of the third cavity 8 is provided with a fourth cavity 19 communicated with the third cavity 8, a second piston plate 18 that can slide left and right is arranged in the fourth cavity 19, and a spring is fixed at the right end of the second piston plate 18. , the other end of the spring is fixed on the right end surface of the fourth cavity 19 .

The left side of the first casing 1 is rotatably connected with a first rotating shaft 3 placed horizontally front and rear. , the middle part of the first housing 1 has a second rotating shaft 5 placed horizontally forward and backward, the dial wheel 10 is coaxially fixed on the second rotating shaft 5, and a first pulley 29 is fixed on the first rotating shaft 3 and the second rotating shaft 5, A first belt 30 is meshed with the outer edges of the two first pulleys 29 , and the first rotating shaft 3 and the second rotating shaft 5 rotate synchronously through the first belt 30 .

There is a parallel third rotating shaft 13 above the second rotating shaft 5, the front and rear ends of the third rotating shaft 13 are rotationally connected to the first housing 1, the sheave 11 is coaxially fixed on the third rotating shaft 13, and the first piston The upper end of the plate 9 is fixed with a U-shaped bar 14 with an opening facing downwards. The left end vertical bar of the U-shaped bar 14 is located outside the second housing 4. A first gear 12 is fixed on the third rotating shaft 13. The left end vertical bar of the U-shaped bar 14 The left end surface of the gear is toothed and meshes with the first gear 12.

The upper end of the first piston plate 9 is fixed with a spring, and the other end of the spring is fixed on the upper end surface of the first cavity 6, and the spring always gives the first piston plate 9 an upward pulling force.

The discharge opening 21 is a straight notch opened along the front and rear direction, and there is a slider 22 that can slide up and down in the discharge opening 21. Larger than the discharge port 21, the lower end surface of the slider 22 is provided with a blind hole 23, and the bottom of the blind hole 23 is provided with a horizontal hole 24 that runs through the left and right end surfaces of the slider 22. The lower end of the slider 22 is fixed with a spring, and the other end of the spring is fixed on the applicator head 20 On the lower end surface, the spring makes the slider 22 always receive a downward force relative to the applicator head 20. The front and rear ends of the slider 22 are located below the applicator head 20 and are respectively connected to a pulley 28. The lower end surface of the pulley 28 is lower than the slider 22. end face.

The lower end surface of the communication port between the first cavity 6 and the third cavity 8 is provided with a relief hole 33, and the cross section of the baffle plate 17 is larger than the size of the communication port between the first cavity 6 and the third cavity 8, and the baffle plate 17 upper end surface is fixed with sliding rod 34, and sliding rod 34 is placed in the relief hole 33, and the upper end of sliding rod 34 is fixed with spring, and the other end of spring is fixed on the bottom of relief hole 33, and spring makes baffle plate 17 fit the lower end face of communication port all the time.

A stirring rod 25 is rotatably connected in the second cavity 7, the stirring rod 25 is placed vertically and the outer edge surface is fixed with several horizontal straight rods, the upper end of the stirring rod 25 extends out of the second housing 4 and stirs The fourth rotating shaft 26 of horizontal front and back direction is arranged at the rod 25 upper end, and the fourth rotating shaft 26 meshes with the stirring rod 25 by a bevel gear, and a second pulley 35 is fixed on the second rotating shaft 5 and the fourth rotating shaft 26, two second pulleys 35 A second belt 36 is engaged with the outer edge surface, and the second rotating shaft 5 and the fourth rotating shaft 26 rotate synchronously through the second belt 36 .

It is worth mentioning that the capacity of the second cavity 7 is relatively large to facilitate the storage of spare scribing paint, and the upper end of the second cavity 7 is provided with a feed port 37 communicating with the outside, which is convenient for replenishing the scribing paint;

The flow rate of line paint from the first cavity 6 into the third cavity 8 is affected by the rotation speed of the wheel 2, which may cause the liquid intake of the third cavity 8 to be greater than the liquid output of the discharge port 21 so that the third cavity Overall positive pressure, the elastic force of the spring at the right end of the second piston plate 18 is always greater than the rightward thrust provided by the positive pressure;

In order to ensure that the first housing 1 maintains balance as a whole when marking lines, a supporting wheel 38 is fixed below the right end of the housing 1 , and the lower end surface of the supporting wheel 38 is located at the same level as the lower end surface of the wheel 2 .

Before the use of the present invention, the first piston plate 9 is located at the uppermost end, and the baffle plate 17 is pulled down to open the communication port between the first cavity 6 and the third cavity 8, and the check valve 27 is opened to make the second cavity The line paint in the body 7 fills the first cavity 6, the second cavity 7 and the third cavity 8 and releases the baffle plate 17. The second piston plate 18 is positioned at the middle part of the fourth cavity 19 and the second piston plate 18 is on the right side. The side spring is not stressed, and the lower end surface of the pulley 28 is higher than the lower end surface of the wheel 2;

When the present invention is in use, the first casing 1 is pushed forward, the wheel 2 rotates to drive the first rotating shaft 3 to rotate, the first rotating shaft 3 drives the second rotating shaft 5 to rotate through the first belt 30, and the second rotating shaft 5 passes through the second belt 36 drives the fourth rotating shaft 26 to rotate, and the fourth rotating shaft 26 drives the stirring rod 25 to rotate through the bevel gear to fully stir the line paint in the second cavity 7 to prevent it from solidifying and agglomerating;

The second rotating shaft 5 drives the dial 10 to rotate. When the dial 10 rotates to the upper half, the short rod 15 is inserted into the through groove 16 to intermittently drive the sheave 11 to rotate at a certain angle. When the sheave 11 rotates, it passes through the third rotating shaft 13 drives the U-shaped rod 14 meshing with the first gear 12 to move downward, and the U-shaped rod 14 drives the first piston plate 9 to press the first cavity 6 downward, the first cavity 6 is compressed, and the first cavity 6 The line paint in the interior gives a downward impulse to the baffle plate 17 when it flows into the third cavity 8 so that the baffle plate 17 moves downwards to open the communication port between the first cavity 6 and the third cavity 8, and the line paint is formed by The first cavity 6 enters the third cavity 8, and at the same time the vertical rod 31 moves downwards to drive the smear head 20 to move downward under the tension of the spring at the lower end, and the smear head 20 expands the third cavity 8 when moving downward. , the second piston plate 18 slides to the left to make up for the negative pressure caused by the expansion of the cavity, so that the applicator head 20 can slide down smoothly until the pulley 28 touches the ground, the slider 22 moves up relative to the applicator head 20, and the horizontal hole 24 is in contact with the applicator The cavity of the head 20 is connected, and the line paint can be discharged along the blind hole 23 through the horizontal hole 24 for marking. Due to the tension of the spring at the right end of the second piston plate 18, the third cavity 8 communicates with the outside through the blind hole 23 When the pressure decreases, the second piston plate 18 can slide to the right and return to the middle of the fourth cavity 19;

After the second piston plate 18 is reset, due to the supporting effect of the spring at the right end of the second piston plate 18, the second piston plate 18 will not slide to the right under the influence of the pressure change when the third cavity 8 enters the liquid until the short rod 15 breaks away. Through the groove 16, the first piston plate 9 stops sliding and starts to reset upward under the action of the spring, the baffle plate 17 closes the communication port between the first cavity 6 and the third cavity 8 upward, and the applicator head 20 is under the action of the stopper 32 With the upward reset of the vertical rod 31, the volume of the third cavity 8 is compressed during the upward reset of the applicator head 20, and the second piston plate 18 slides to the right, so that the applicator head 20 can be reset upward smoothly, and the slider 22 is separated from the ground by the spring. Under the action, the horizontal hole 24 is blocked again. During the upward movement of the first piston plate 9, the first cavity 6 is under negative pressure, the check valve 27 is opened, and the spare marking paint in the second cavity 7 passes through the one-way valve. The valve 27 enters the first cavity 6 to make up the pressure, wait for the dial 10 to re-engage with the sheave 11, and then repeat the above process;

Due to the use of the spring at the right end of the second piston plate 18 in the first marking cycle, the applicator head 20 moves down to move the second piston plate 18 to the left, the spring stretches, and then the third cavity 8 communicates with the outside through the blind hole 23 When the pressure decreases, the second piston plate 18 can slide to the right and return to the middle of the fourth cavity 19. After the first scribing cycle ends, the volume of the third cavity 8 is compressed due to the upward movement of the smear head 20. The second piston plate 18 moves to the right, and the spring at the right end of the second piston plate 18 is in a compressed state. When the next cycle or even each new cycle begins, the second piston plate can reset to the left after the smear head 20 moves down, without The situation that the spring at the right end of the second piston plate 18 is stretched occurs again.

The device provides the power source through the rotation of the wheel 2, and uses the grooved wheel mechanism to realize the intermittent extrusion of the first piston plate 9 on the first cavity 6, and squeeze the line paint in the first cavity 6 to the third cavity After the body 8 is reset, the second cavity 7 lines of paint are extracted through the check valve 15 to make up for the lack of the first cavity 6. Since the rolling distance of the wheel 2 is determined, the length of the marking line and the interval length each time are also determined, and the device is realized. The equally spaced marking lines, utilize the movement of the first piston plate 9 to make the line paint in the first cavity 6 enter the third cavity 8 after providing a downward impulse to the baffle plate 17, and the wheel 2 moves fast. The first piston plate 9 just slides down fast, and the liquid output is just more, and similarly the wheel 2 moves slowly, and the liquid output is just little, guarantees that the liquid output in the unit distance that the wheel 2 walks is constant, and the paint output of the device is only It is related to the moving speed, which avoids the uneven marking caused by the unstable moving speed. It adopts a purely mechanical structure instead of the equal interval marking realized by the circuit sensor in the prior art, and can realize the alignment of the center of the road without power supply. Equal interval scribing of lines reduces the transportation cost of avoiding power supply during long-distance scribing operations and improves scribing efficiency;

In the process of moving down with the first piston plate 9 through the vertical rod 31, the smear head 20 is moved down by the extension spring and always gives a downward force to the smear head 20, so that the smear head 20 can adapt to the uneven road surface and always be in line with it. In contact with the ground, use the pulley 28 to contact the ground to move the slider 22 upward relative to the smear head 20, so that the horizontal hole 24 communicates with the cavity of the smear head 20, and the scribing paint in the smear head 20 can be discharged along the blind hole 23 for scribing. After the applicator head 20 is moved up and off the ground, the horizontal hole 24 is blocked, which greatly improves the marking accuracy and ensures that the marking end is neat and not dragged;

The change of the pressure in the third cavity 8 caused by the movement of the smear head 20 is compensated by the left and right movement of the second piston plate 18, so that the smear head 20 can move up and down smoothly;

The flow rate of line paint from the first cavity 6 into the third cavity 8 is affected by the rotation speed of the wheel 2, which may cause the liquid intake of the third cavity 8 to be greater than the liquid output of the discharge port 21 so that the third cavity Overall positive pressure, the elastic force of the spring at the right end of the second piston plate 18 is always greater than the rightward thrust provided by the positive pressure, preventing the second piston plate 18 from moving to the right after receiving the positive pressure to buffer the positive pressure when marking the line. If the discharge port 21 is sprayed at a constant speed all the time, it is impossible to ensure that the liquid output in the unit distance traveled by the wheel 2 is constant, and the purpose of uniform marking cannot be achieved;

Through the belt drive, the wheel 2 drives the stirring rod 25 to continuously stir the second cavity 7, and the second cavity 7 continuously provides the first cavity 6 with line paint while preventing long-term scribing. coagulation or agglomeration.

Claims (5)

1. An automatic equidistant marking device for roads, comprising a first housing (1), characterized in that the first housing (1) is a rectangular housing, and the first housing (1) is fixed There are wheels (2), a dial (10) in the middle of the first housing (1), the rotation of the wheel (2) can drive the dial (10) to rotate, and there is a slotted wheel (11) above the dial (10), The front side of the dial (10) is fixed with a short rod (15), and the sheave (11) is provided with a through groove (16) in the radial direction. When the dial (10) rotates, the short rod (15) is inserted into the through groove ( 16) Drive the sheave (11) to rotate at a certain angle, after the short rod (15) breaks away from the through groove (16), the sheave (11) resets, and the second housing is fixed at the lower right end of the cavity of the first housing (1) (4), the upper left end of the second housing (4) is provided with a first cavity (6), in which there is a first piston plate (9) that can slide up and down, and the sheave (11) rotates It can drive the first piston plate (9) to move up and down; the upper right end of the second housing (4) is provided with a second cavity (7), and the second cavity (7) communicates with the lower end of the first cavity (6). A one-way valve (27) is fixed at the communication port, and the one-way valve (27) allows the material in the second cavity (7) to flow into the first cavity (6) only in one direction; The lower end of the second housing (4) is provided with a third cavity (8), the upper end of the third cavity (8) communicates with the bottom of the first cavity (6), and the first cavity (6) is connected to the third cavity ( 8) There is a baffle (17) at the lower end of the communication port. The baffle (17) can move up and down and is always pulled upwards. The upward movement of the baffle (17) can block the first cavity (6) and the third cavity ( 8), the lower end of the third cavity (8) communicates with the outside of the first housing (1), and there is a smear head (20) at the lower end of the third cavity (8), and the smear head (20) is open at the upper end housing, and can slide up and down along the third cavity (8), the lower end of the first piston plate (9) is fixed with a vertical rod (31) that runs through the baffle plate (17) and the upper end surface of the applicator head (20), the vertical The lower end of the straight rod (31) is fixed with a stopper (32), and a tension spring is fixed between the stopper (32) and the upper surface of the applicator head (20), and the lower end surface of the applicator head (20) is provided with a discharge port (21), When the lower end surface of the applicator head (20) touches the ground, the discharge port (21) is opened, and when the lower end surface of the applicator head (20) is separated from the ground, the discharge port (21) is closed; The right end of the third cavity (8) is provided with a fourth cavity (19) communicating with the third cavity (8), and there is a second piston plate (18) that can slide left and right in the fourth cavity (19) , the right end of the second piston plate (18) is fixed with a spring, and the other end of the spring is fixed on the right end surface of the fourth cavity (19); The discharge port (21) is a straight notch opened along the front and rear directions, and there is a slider (22) in the discharge port (21) that can slide up and down. The length of the slider (22) is longer than that of the discharge port. length and the upper and lower ends of the slider (22) are larger than the discharge port (21), the lower end surface of the slider (22) is provided with a blind hole (23), and the bottom of the blind hole (23) is provided with a hole that runs through the left and right end surfaces of the slider (22). The horizontal hole (24), the lower end of the slider (22) is fixed with a spring, and the other end of the spring is fixed on the lower end surface of the applicator head (20), the spring makes the slider (22) always receive a downward force relative to the applicator head (20), The front and rear ends of the slider (22) are respectively rotated and connected with a pulley (28) at the position below the applicator head (20), and the lower end surface of the pulley (28) is lower than the lower end surface of the slider (22); A stirring rod (25) is rotatably connected in the second cavity (7). The stirring rod (25) is placed vertically and has several horizontal straight rods fixed on the outer edge surface. The upper end of the stirring rod (25) extends Out of the second casing (4) and the upper end of the stirring rod (25) has a fourth rotating shaft (26) in the horizontal front and rear direction, the fourth rotating shaft (26) meshes with the stirring rod (25) through a bevel gear, and the second rotating shaft (5) and the fourth rotating shaft (26) are fixed with a second pulley (35), the outer edge surfaces of the two second pulleys (35) are engaged with the second belt (36), the second rotating shaft (5) and the fourth rotating shaft (26 ) rotate synchronously through the second belt (36). 2. An automatic equidistant marking device for roads according to claim 1, characterized in that the left side of the first housing (1) is rotatably connected with a first rotating shaft (3) placed horizontally front and rear, The front and rear ends of the first rotating shaft (3) run through the front and rear end faces of the first housing (1). The wheels (2) are fixed on the front and rear ends of the first rotating shaft (3). The second rotating shaft (5), the thumb wheel (10) is coaxially fixed on the second rotating shaft (5), and a first pulley (29) is fixed on the first rotating shaft (3) and the second rotating shaft (5). A first belt (30) is meshed on the outer surface of the first pulley (29), and the first rotating shaft (3) and the second rotating shaft (5) realize synchronous rotation through the first belt (30). 3. A road automatic equidistant marking device according to claim 2, characterized in that there is a parallel third rotating shaft (13) above the second rotating shaft (5), and the third rotating shaft (13) The front and rear ends are rotatably connected to the first casing (1), the sheave (11) is coaxially fixed on the third rotating shaft (13), and the upper end of the first piston plate (9) is fixed with a U-shaped bar with the opening facing downward. (14), the vertical bar at the left end of the U-shaped bar (14) is located outside the second housing (4), and a first gear (12) is fixed on the third rotating shaft (13), and the vertical bar at the left end of the U-shaped bar (14) The left end surface is a toothed surface and meshes with the first gear (12), and the vertical rod at the right end is fixed on the first piston plate (9). (9) can move down to the bottom of the first cavity (6). 4. A road automatic equidistant marking device according to claim 3, characterized in that, the upper end of the first piston plate (9) is fixed with a spring, and the other end of the spring is fixed in the first cavity (6) On the upper end face, the spring always gives an upward pulling force to the first piston plate (9). 5. An automatic equidistant marking device for roads according to claim 1, characterized in that the lower end surface of the communication port between the first cavity (6) and the third cavity (8) is provided with a relief The hole (33), the baffle plate (17) cross section is larger than the size of the communication port between the first cavity (6) and the third cavity (8), the upper end surface of the baffle plate (17) is fixed with a sliding rod (34), and the sliding rod (34 ) is placed in the relief hole (33), the upper end of the sliding rod (34) is fixed with a spring, and the other end of the spring is fixed at the bottom of the relief hole (33), and the spring makes the baffle (17) always fit the lower end surface of the communication port.