Paint can pressure applying device of road marking vehicle

Abstract

The invention relates to the technical field of press machines, in particular to a paint can pressure applying device of a road marking vehicle, which is used for solving the problem that an existing device is not easy to automatically and accurately adjust paint spraying flow according to the moving speed of the marking vehicle. The pressure control mechanism comprises a vehicle body, a transmission shaft and moving wheels connected to the transmission shaft, the vehicle body is connected with a paint spraying mechanism, the paint spraying mechanism comprises a connecting frame connected to the vehicle body, and the connecting frame is connected with a lower support through a hydraulic rod; the connecting frame is connected with an oil pump driven by the transmission shaft, the oil pump is communicated with an oil box through an oil pumping pipe and an oil return pipe, the oil pump is connected with the oil pumping pipe, and when the rotating speed of the transmission shaft is increased, the pump speed of the oil pump is increased, so that the oil outlet speed of the hydraulic rod is higher than the oil inlet speed, and the hydraulic rod is shortened to increase the paint spraying flow of the marking paint tank; the device can adaptively change the paint spraying flow of the marking paint tank according to the moving speed of the vehicle body.

Description

Technical Field

[0001] The present invention relates to the technical field of presses, belonging to B30B12, and particularly relates to a paint tank pressurizing device for a road marking vehicle. Background Art

[0002] In modern road traffic construction, the precise drawing of road markings plays a crucial role in ensuring traffic safety and regulating traffic order. As the core equipment for marking drawing, the performance of road marking vehicles directly affects the quality of markings. With the continuous growth of traffic flow and the improvement of requirements for the aesthetics and durability of road markings.

[0003] Currently, many problems have emerged in the practical application of traditional road marking vehicles. In terms of paint spraying flow control, existing devices are not easy to accurately automatically adjust the paint spraying amount according to the vehicle moving speed, and the situation of uneven paint layer thickness on the road surface often occurs. This not only reduces the visibility and service life of the markings, but also may lead to potential traffic safety hazards and increase road maintenance costs.

[0004] When the existing road marking vehicles use pressure to control the paint spraying flow, the technical means are relatively backward. Most devices apply a constant pressure to the paint spraying tank and cannot achieve precise regulation of the paint spraying flow. Summary of the Invention

[0005] The present invention provides a paint tank pressurizing device for a road marking vehicle to solve the problem that existing devices are not easy to automatically and accurately adjust the paint spraying flow according to the moving speed of the line marking vehicle.

[0006] To alleviate the above technical problems, the technical solution provided by the present invention lies in:

[0007] A paint tank pressurizing device for a road marking vehicle, including a pressure control mechanism. The pressure control mechanism includes a vehicle body, a transmission shaft, and moving wheels connected to the transmission shaft. A paint spraying mechanism is connected to the vehicle body. The paint spraying mechanism includes a connecting frame connected to the vehicle body. A lower support is connected to the connecting frame through a hydraulic rod. An upper support is connected to the connecting frame. A marking paint tank is jointly installed on the upper support and the lower support. The lower support abuts against the switch of the marking paint tank;

[0008] An oil pump driven by the transmission shaft is connected to the connecting frame. The oil pump is communicated with an oil box through a suction pipe and a return pipe. The oil pump is connected to the suction pipe. When the rotational speed of the transmission shaft increases, the pumping speed of the oil pump increases. Thus, the oil outlet speed of the hydraulic rod is higher than the oil inlet speed, and thus the hydraulic rod shortens, so that the paint spraying flow of the marking paint tank increases.

[0009] Further, a control box is connected to the oil return pipe. A blocking block is slidably connected inside the control box. The blocking block can slide vertically inside the control box to control the flux of the oil return pipe.

[0010] Further, an N-shaped frame is fixedly connected to the connecting frame. A small cylinder is connected to the N-shaped frame. The output end of the small cylinder is connected to the blocking block. When the pump speed of the oil pump changes from high to low, the small cylinder gradually shortens, so that the flux of the oil return pipe gradually increases, so as to reduce the shortening force of the hydraulic rod.

[0011] Further, a margin sensing mechanism is further included. The margin sensing mechanism includes a detection pipe. One end of the detection pipe is close to the nozzle of the marking paint can, and the other end is communicated with a spherical shell. An air flow sensor is connected inside the spherical shell, and through holes are formed in the shell wall.

[0012] Further, a windshield is connected in the moving direction of the lower support towards the vehicle body.

[0013] Further, the margin sensing mechanism further includes a gear connected to the rectangular block and a rack connected to the connecting frame. The rack is engaged with the gear. An installation rod is connected to the gear. The detection pipe is connected to the end of the installation rod. When the rack slides down, the gear rotates to make the port of the detection pipe close to the nozzle of the marking paint can.

[0014] Further, the margin sensing mechanism further includes a mounting plate connected to the rectangular block. A pressure-sensitive switch for controlling the air flow sensor is arranged on the mounting plate. A swing rod is connected to the installation rod. When the hydraulic rod is shortened to the shortest state, the opening of the marking paint can is the largest, and the swing rod presses the pressure-sensitive switch to turn on the air flow sensor.

[0015] Further, a pressurizing mechanism is further included. The pressurizing mechanism includes an electric telescopic rod. The output end of the electric telescopic rod is connected with a sleeve. The sleeve is sleeved on the bottom of the marking paint can, and a sealing ring is arranged on the inner wall of the sleeve. A puncture needle is connected to the middle of the sleeve. A pressure transmission hole is arranged inside the puncture needle. After the air flow sensor detects that the painting pressure decreases, the electric telescopic rod extends, so that the sleeve slides down on the marking paint can, so that the puncture needle penetrates the bottom wall of the marking paint can, and the air between the sleeve and the marking paint can enters the marking paint can through the pressure transmission hole.

[0016] Further, the pressurizing mechanism further includes a rotating frame rotatably connected to the connecting frame. The electric telescopic rod is connected to the rotating frame. A piston cylinder is connected to the rotating frame. A piston plate is slidably connected in the piston cylinder. A piston rod is connected between the piston plate and the sleeve. An air pipe communicates the lower space of the piston cylinder below the piston plate with the inner space of the sleeve. A pressure stabilizing hole is formed in the top wall of the piston cylinder.

[0017] Further, a heating wire is connected to the inner wall of the sleeve, and the heating wire operates when the electric telescopic rod extends.

[0018] The beneficial effects of the present invention are analyzed as follows:

[0019] A paint tank pressurizing device for a road marking vehicle includes a pressure control mechanism. The pressure control mechanism includes a vehicle body, a transmission shaft, and moving wheels connected to the transmission shaft. A painting mechanism is connected to the vehicle body. The painting mechanism includes a connecting frame connected to the vehicle body. A lower support is connected to the connecting frame through a hydraulic rod. An upper support is connected to the connecting frame. A marking paint tank is jointly installed on the upper support and the lower support. The lower support abuts against the switch of the marking paint tank. A fuel pump driven by the transmission shaft is connected to the connecting frame. The fuel pump is communicated with an oil box through a suction pipe and a return pipe. The fuel pump is connected to the suction pipe. When the rotational speed of the transmission shaft increases, the pumping speed of the fuel pump increases. As a result, the oil outlet speed of the hydraulic rod is higher than the oil inlet speed, so that the hydraulic rod shortens, so as to increase the painting flow rate of the marking paint tank.

[0020] When the transmission shaft rotates, it can drive the fuel pump to operate. When the fuel pump operates, it extracts the hydraulic oil in the hydraulic rod into the oil box through the suction pipe. The negative pressure generated in the hydraulic rod extracts the hydraulic oil in the oil box into the hydraulic rod through the return pipe. The inner diameter of the suction pipe is larger than that of the return pipe, so that the speed of the hydraulic oil discharged from the hydraulic rod through the suction pipe is higher than the speed of the hydraulic oil entering through the return pipe under the same pressure. And the operating speed of the fuel pump is positively correlated with the rotational speed of the transmission shaft. When the rotational speed of the transmission shaft increases, the moving speed of the vehicle body increases, and the pumping speed of the fuel pump increases. At this time, the suction pipe extracts the hydraulic oil in the hydraulic rod, and the speed of the hydraulic oil flowing out of the hydraulic rod through the suction pipe is lower than the speed of the hydraulic oil entering the hydraulic rod through the return pipe. Therefore, the hydraulic rod can shorten at this time. When the hydraulic rod shortens, it drives the lower support to move upward and squeeze the switch of the marking paint tank to spray paint on the road surface. And the faster the moving speed of the vehicle body, the more the painting amount of the marking paint tank, ensuring that it is adapted to the moving speed of the vehicle body. Description of the Drawings

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of the overall structure of the present invention;

[0023] Figure 2 Schematic diagram of the structure at the connecting frame of the present invention;

[0024] Figure 3 For the present invention Figure 2 Schematic diagram of the structure of part A in;

[0025] Figure 4 For the present invention Figure 2 Schematic diagram of the structure of part B in;

[0026] Figure 5 Schematic diagram of the structure at the air flow sensor of the present invention;

[0027] Figure 6 Schematic diagram of the structure at the oil pump of the present invention;

[0028] Figure 7 Schematic diagram of the structure at the sleeve of the present invention;

[0029] Figure 8 Schematic diagram of the structure at the pressure transmission hole of the present invention.

[0030] Icon:

[0031] 100, pressure control mechanism; 110, vehicle body; 120, transmission shaft; 130, moving wheel; 140, oil box; 150, oil suction pipe; 160, oil return pipe; 170, control box; 171, block; 180, N-shaped frame; 181, small cylinder; 200, painting mechanism; 210, connecting frame; 220, oil pump; 230, hydraulic rod; 240, rectangular block; 250, lower support; 260, width limiting plate; 270, wind shield; 280, marking paint can; 290, upper support; 300, remaining amount sensing mechanism; 310, gear; 320, mounting rod; 330, rack; 340, detection tube; 350, spherical shell; 351, through hole; 360, air flow sensor; 370, swing rod; 380, mounting plate; 390, pressure sensitive switch; 400, pressurizing mechanism; 410, rotating frame; 420, electric telescopic rod; 430, sleeve; 440, heating wire; 450, puncture needle; 451, pressure transmission hole; 460, piston cylinder; 470, piston rod; 480, piston plate; 490, air pipe; 491, pressure stabilizing hole. Detailed implementation manners

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] An embodiment is as Figures 1 - 8 shown. A paint tank pressing device for a road marking vehicle includes a pressure control mechanism 100. The pressure control mechanism 100 includes a vehicle body 110, a transmission shaft 120, and a moving wheel 130 connected to the transmission shaft 120. A painting mechanism 200 is connected to the vehicle body 110. The painting mechanism 200 includes a connecting frame 210 connected to the vehicle body 110. A lower support 250 is connected to the connecting frame 210 through a hydraulic rod 230. An upper support 290 is connected to the connecting frame 210. A marking paint tank 280 is jointly installed on the upper support 290 and the lower support 250. The lower support 250 abuts against the switch of the marking paint tank 280. An oil pump 220 driven by the transmission shaft 120 is connected to the connecting frame 210. The oil pump 220 is communicated with an oil box 140 through a suction pipe 150 and a return pipe 160. The oil pump 220 is connected to the suction pipe 150. When the rotational speed of the transmission shaft 120 increases, the pumping speed of the oil pump 220 increases, so that the oil outlet speed of the hydraulic rod 230 is higher than the oil inlet speed, and thus the hydraulic rod 230 shortens, so that the painting flow rate of the marking paint tank 280 increases.

[0036] The working mechanism of the paint can pressing device of the road marking vehicle provided in this embodiment:

[0037] The vehicle body 110 moves along a predetermined trajectory relying on existing satellite positioning technology. The marking paint can 280 is inverted so that the paint spraying port faces the road surface. The lower support 250 supports the paint spraying port part of the marking paint can 280, and the upper support 290 fixes the bottle body of the marking paint can 280. The upper support 290 can be two arc-shaped clamping blocks cooperating with nuts to lock the marking paint can 280, or an existing hoop structure can be adopted. The transmission shaft 120 rotates and drives the moving wheels 130 to roll on the road surface, so that the vehicle body 110 moves. The pump shaft of the oil pump 220 is connected to the transmission shaft 120, and when the transmission shaft 120 rotates, it can drive the oil pump 220 to operate. When the oil pump 220 operates, it extracts the hydraulic oil in the hydraulic rod 230 into the oil box 140 through the suction pipe 150. The negative pressure generated in the hydraulic rod 230 extracts the hydraulic oil in the oil box 140 into the hydraulic rod 230 through the return pipe 160. The inner diameter of the suction pipe 150 is larger than that of the return pipe 160, so that the speed at which the hydraulic oil in the hydraulic rod 230 is discharged through the suction pipe 150 is higher than the speed at which the hydraulic oil enters through the return pipe 160 under the same pressure. And the operating speed of the oil pump 220 is positively correlated with the rotation speed of the transmission shaft 120. When the rotation speed of the transmission shaft 120 increases, the moving speed of the vehicle body 110 increases and the pump speed of the oil pump 220 increases. At this time, the suction pipe 150 extracts the hydraulic oil in the hydraulic rod 230, and the speed at which the hydraulic oil in the hydraulic rod 230 flows out through the suction pipe 150 is lower than the speed at which the hydraulic oil enters the hydraulic rod 230 through the return pipe 160. Thus, the hydraulic rod 230 can shorten at this time. When the hydraulic rod 230 shortens, it drives the lower support 250 to move upward and squeeze the switch of the marking paint can 280 to spray paint on the road surface. And the faster the vehicle body 110 moves, the more paint is sprayed from the marking paint can 280, ensuring that it is adapted to the moving speed of the vehicle body 110.

[0038] In an alternative embodiment of this example, preferably:

[0039] A control box 170 is connected to the return pipe 160. A plug 171 is slidably connected in the control box 170, and the plug 171 can slide vertically in the control box 170 to control the flux of the return pipe 160.

[0040] When the plug 171 in the control box 170 slides, it can control the flux of the return pipe 160, so that the elongation resistance of the hydraulic rod 230 increases, and further the contraction force of the hydraulic rod 230 can be maintained to apply sufficient pressure to the marking paint can 280.

[0041] In an alternative embodiment of this example, preferably:

[0042] A N-shaped frame 180 is fixedly connected to the connecting frame 210. A small cylinder 181 is connected to the N-shaped frame 180. The output end of the small cylinder 181 is connected to the plug 171. When the pump speed of the oil pump 220 changes from high to low, the small cylinder 181 gradually shortens, so that the flux of the return oil pipe 160 gradually increases, reducing the shortening force of the hydraulic rod 230.

[0043] When the control system detects a decrease in the rotational speed of the transmission shaft 120, it controls the small cylinder 181 to gradually shorten, causing the plug 171 to be driven to slide away from the control box 170. At this time, the opening of the return oil pipe 160 increases, making it easier for the hydraulic oil in the oil box 140 to enter the hydraulic rod 230, reducing the elongation resistance of the hydraulic rod 230, thereby reducing the button pressure of the hydraulic rod 230 on the marking paint can 280, and enabling the spraying amount of the marking paint can 280 to be reduced in a timely manner when the moving speed of the vehicle body 110 decreases.

[0044] In an alternative embodiment of the present example, preferably:

[0045] A rectangular block 240 is connected to the output end of the hydraulic rod 230, and the lower support 250 is connected to the rectangular block 240.

[0046] The rectangular block 240 is connected to the output end of the hydraulic rod 230, and the lower support 250 is connected to the hydraulic rod 230 through the rectangular block 240, increasing the stability of the connection of the lower support 250.

[0047] In an alternative embodiment of the present example, preferably:

[0048] Two width-limiting plates 260 are symmetrically hinged to the lower surface of the lower support 250.

[0049] The width-limiting plates 260 can swing relative to the lower support 250, and nuts are threadedly connected to the hinge shafts of the width-limiting plates 260. Tightening the nuts causes the nuts to abut against the lower support 250, thereby fixing the angles of the width-limiting plates 260. The two width-limiting plates 260 are symmetrically arranged on both sides of the spraying port of the marking paint can 280. By adjusting the angles of the two width-limiting plates 260, the marking width of the road can be adjusted.

[0050] Regarding the structure of the margin sensing mechanism 300, specifically:

[0051] The margin sensing mechanism 300 includes a detection tube 340. One end of the detection tube 340 is close to the nozzle of the marking paint can 280, and the other end is communicated with a spherical shell 350. An air flow sensor 360 is connected inside the spherical shell 350, and through holes 351 are opened on the shell wall.

[0052] When the line painting paint can 280 sprays paint on the road surface, when the amount of paint in the line painting paint can 280 is large, the paint spraying flow rate at its paint spraying port is large, so the air flow at the paint spraying port is strong. The port of the detection tube 340 is close to the paint spraying port of the line painting paint can 280, so the air flow generated during painting can disturb the air flow in the detection tube 340. Furthermore, the air flow sensor 360 connected to the spherical shell 350 can detect the intensity of the air flow, and then the remaining amount of paint in the line painting paint can 280 can be obtained. The through hole 351 on the spherical shell 350 ensures the flow of the air flow, so that the air flow movement generated during painting can be transmitted to the air flow sensor 360;

[0053] The air flow sensor 360 can adopt a microelectromechanical system (MEMS) sensor. This kind of sensor has a small volume and high precision, and can monitor the weak changes of the air flow in real time.

[0054] In an optional manner of this embodiment, a more preferred one is:

[0055] A wind shield 270 is connected in the moving direction of the lower support 250 towards the vehicle body 110.

[0056] The setting of the wind shield 270 enables the line painting paint can 280 to block the wind that may be generated in the moving direction of the vehicle body 110 when painting the road for line marking, ensuring that the paint sprayed by the line painting paint can 280 can fall on the required position. And the setting of the wind shield 270 greatly reduces the influence of other possible air flows on the air flow sensor 360 except for the air flow generated during the painting of the line painting paint can 280.

[0057] In an optional manner of this embodiment, a more preferred one is:

[0058] The remaining amount induction mechanism 300 further includes a gear 310 connected to the rectangular block 240 and a rack 330 connected to the connecting frame 210. The rack 330 meshes with the gear 310. An installation rod 320 is connected to the gear 310, and the detection tube 340 is connected to the end of the installation rod 320. When the rack 330 slides down, the gear 310 rotates to make the port of the detection tube 340 close to the nozzle of the line painting paint can 280.

[0059] When the hydraulic rod 230 shortens, the rectangular block 240 approaches the connecting frame 210. At this time, the gear 310 moves down and drives the gear 310 to rotate. The gear 310 drives the detection tube 340 to swing through the installation rod 320, so that the end of the detection tube 340 approaches the paint spraying port of the line painting paint can 280. On the contrary, the end of the detection tube 340 moves away from the paint spraying port of the line painting paint can 280, making it not easy to collide with the detection tube 340 when disassembling and assembling the line painting paint can 280 later, thus avoiding the situation that the detection tube 340 may be deformed due to being collided, resulting in the port of the detection tube 340 being difficult to transmit the paint spraying air flow.

[0060] In an optional manner of this embodiment, a more preferred one is:

[0061] The remaining amount sensing mechanism 300 further includes a mounting plate 380 connected to the rectangular block 240. A pressure-sensitive switch 390 for controlling the air flow sensor 360 is provided on the mounting plate 380. A swing rod 370 is connected to the mounting rod 320. When the hydraulic rod 230 is shortened to the shortest state, the opening of the marking paint can 280 is the largest, and the swing rod 370 presses the pressure-sensitive switch 390 to turn on the air flow sensor 360.

[0062] Since the painting flow rate of the marking paint can 280 is low when the vehicle body 110 moves at a low speed, the air flow sensor 360 does not need to be started at this time. When the vehicle body 110 moves at the fastest speed, the hydraulic rod 230 is shortened to the shortest distance. At this time, the painting flow rate of the marking paint can 280 reaches the maximum. At the same time, the rack 330 drives the gear 310 to rotate, so that the swing rod 370 presses the pressure-sensitive switch 390. At this time, the air flow sensor 360 is turned on to detect the painting air flow of the fully opened marking paint can 280. When the air flow sensor 360 detects that the air flow speed decreases, it means that the paint in the marking paint can 280 is about to be exhausted.

[0063] Regarding the structure of the pressurizing mechanism 400, specifically:

[0064] The pressurizing mechanism 400 includes an electric telescopic rod 420. The output end of the electric telescopic rod 420 is connected with a sleeve 430. The sleeve 430 is sleeved on the bottom of the marking paint can 280, and a sealing ring is provided on the inner wall of the sleeve 430. A puncture needle 450 is connected to the middle of the sleeve 430. A pressure transmission hole 451 is opened inside the puncture needle 450. After the air flow sensor 360 detects that the painting pressure decreases, the electric telescopic rod 420 extends, so that the sleeve 430 slides down on the marking paint can 280, so that the puncture needle 450 penetrates the bottom wall of the marking paint can 280, and the air between the sleeve 430 and the marking paint can 280 enters the marking paint can 280 through the pressure transmission hole 451.

[0065] The setting of the pressurizing mechanism 400 enables the paint in the marking paint can 280 to be emptied as much as possible. When the air flow sensor 360 detects that the air flow becomes weak, the electric telescopic rod 420 shortens, so that the sleeve 430 moves downward, so that the puncture needle 450 in the sleeve 430 pierces the bottom wall of the marking paint can 280. Thus, the internal space of the sleeve 430 is communicated with the internal space of the marking paint can 280 through the pressure transmission hole 451 on the puncture needle 450. Subsequently, the electric telescopic rod 420 continues to move downward relative to the marking paint can 280, so that the total internal space of the two is reduced, and then the pressure in the marking paint can 280 is increased, so that the remaining paint in the marking paint can 280 is discharged as much as possible;

[0066] The sealing ring on the inner wall of the sleeve 430 fits against the outer wall of the marking paint can 280 to ensure airtightness and reduce air flow leakage.

[0067] In an alternative embodiment of the present embodiment, a more preferred one is:

[0068] The pressing mechanism 400 further includes a rotating frame 410, the rotating frame 410 is rotatably connected to the connecting frame 210, the electric telescopic rod 420 is connected to the rotating frame 410, a piston cylinder 460 is connected to the rotating frame 410, a piston plate 480 is slidably connected in the piston cylinder 460, a piston rod 470 is connected between the piston plate 480 and the sleeve 430, an air pipe 490 is communicated between the lower space of the piston cylinder 460 located below the piston plate 480 and the inner space of the sleeve 430, and a pressure stabilizing hole 491 is formed in the top wall of the piston cylinder 460.

[0069] The rotating frame 410 can rotate relative to the connecting frame 210. Manually pulling the rotating frame 410 out of the upper part of the upper support 290 enables the disassembly and assembly of the marking paint can 280. After installing the marking paint can 280, manually rotating the rotating frame 410 to directly above the marking paint can 280, and then controlling the electric telescopic rod 420 to slightly extend, so that the sleeve 430 is sleeved on the marking paint can 280 and the puncture needle 450 does not contact the marking paint can 280;

[0070] In addition, when the sleeve 430 moves downward, it can drive the piston plate 480 to move downward through the piston rod 470. Thus, the air in the piston cylinder 460 enters the sleeve 430 through the air pipe 490, further increasing the air pressure in the sleeve 430. The setting of the pressure stabilizing hole 491 enables the downward movement of the piston plate 480 not to be affected by the negative pressure in the upper part of the piston cylinder 460.

[0071] In an alternative embodiment of the present embodiment, a more preferred one is:

[0072] A heating wire 440 is connected to the inner wall of the sleeve 430, and the heating wire 440 operates when the electric telescopic rod 420 extends.

[0073] The heating wire 440 is arranged inside the inner wall of the sleeve 430 and does not directly contact the inner space of the sleeve 430. When the control system detects that the electric telescopic rod 420 extends, it controls the heating wire 440 to operate. When the heating wire 440 operates, it can heat the air in the sleeve 430, causing the air in the sleeve 430 to expand due to heat, further increasing the air pressure in the sleeve 430;

[0074] In addition, the heat of the heating wire 440 is not too high, thus avoiding the situation where the paint may be ignited and its components may be damaged.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A paint can pressure device for a road marking vehicle, comprising a pressure control mechanism (100), wherein the pressure control mechanism (100) comprises a vehicle body (110), a transmission shaft (120) and a moving wheel (130) connected to the transmission shaft (120), characterized in that: The vehicle body (110) is connected to a paint spraying mechanism (200), the paint spraying mechanism (200) comprises a connecting frame (210) connected to the vehicle body (110), a lower support (250) is connected to the connecting frame (210) via a hydraulic rod (230), an upper support (290) is connected to the connecting frame (210), a marking paint can (280) is mounted on both the upper support (290) and the lower support (250), and the lower support (250) abuts against a switch of the marking paint can (280); The connecting frame (210) is connected to an oil pump (220) driven by the transmission shaft (120). The oil pump (220) is connected to an oil box (140) via an oil extraction pipe (150) and an oil return pipe (160). The oil pump (220) is connected to the oil extraction pipe (150). When the rotation speed of the transmission shaft (120) increases, the pumping speed of the oil pump (220) increases, so that the oil outlet speed of the hydraulic rod (230) is higher than the oil inlet speed, so that the hydraulic rod (230) is shortened, so that the paint spraying flow of the marking paint can (280) increases.

2. The paint can pressure applying device for a road marking vehicle according to claim 1, characterized in that: The oil return pipe (160) is connected to a control box (170), and a block (171) is slidably connected inside the control box (170). The block (171) can vertically slide inside the control box (170) to control the flux of the oil return pipe (160).

3. The paint can pressure applying device for a road marking vehicle according to claim 2, characterized in that: The connecting frame (210) is fixedly connected to an N-shaped frame (180), the N-shaped frame (180) is connected to a small cylinder (181), the output end of the small cylinder (181) is connected to the block (171), and when the pump speed of the oil pump (220) changes from high to low, the small cylinder (181) gradually shortens, so that the flux of the oil return pipe (160) gradually increases, so that the shortening force of the hydraulic rod (230) is reduced.

4. The paint can pressure applying device for a road marking vehicle according to claim 3, characterized in that: The invention also comprises a residual amount sensing mechanism (300), wherein the residual amount sensing mechanism (300) comprises a detection tube (340), one end of the detection tube (340) is close to the nozzle of the marking paint can (280), and the other end is connected to a spherical shell (350), an airflow sensor (360) is connected inside the spherical shell (350), and a through hole (351) is opened on the shell wall.

5. The paint can pressure applying device for a road marking vehicle according to claim 4, characterized in that: The lower support (250) is connected to a windshield plate (270) in the moving direction toward the vehicle body (110).

6. The paint can pressure applying device for a road marking vehicle according to claim 5, characterized in that: The remaining amount sensing mechanism (300) further comprises a gear (310) connected to the rectangular block (240) and a rack (330) connected to the connecting frame (210); the rack (330) is meshed with the gear (310); a mounting rod (320) is connected to the gear (310); the detection tube (340) is connected to the end of the mounting rod (320); when the rack (330) slides down, the gear (310) rotates so that the end of the detection tube (340) is close to the nozzle of the marking paint can (280).

7. The paint can pressure applying device for a road marking vehicle according to claim 6, characterized in that: The remaining amount sensing mechanism (300) further comprises a mounting plate (380) connected to the rectangular block (240), a pressure-sensitive switch (390) for controlling the airflow sensor (360) being arranged on the mounting plate (380), a swing arm (370) being connected to the mounting rod (320), and when the hydraulic rod (230) is shortened to the shortest state, the marking paint can (280) is opened to the maximum, and the swing arm (370) presses the pressure-sensitive switch (390) to turn on the airflow sensor (360).

8. The paint can pressure applying device for a road marking vehicle according to claim 7, characterized in that: The device further comprises a pressurizing mechanism (400), wherein the pressurizing mechanism (400) comprises an electric telescopic rod (420), wherein the output end of the electric telescopic rod (420) is connected to a sleeve (430), wherein the sleeve (430) is sleeved on the bottom of the marking paint can (280), and a sealing ring is provided on the inner wall of the sleeve (430), wherein a puncture needle (450) is connected to the middle of the sleeve (430), and a pressure transmission hole is provided inside the puncture needle (450). (451), after the airflow sensor (360) detects that the paint spraying pressure is reduced, the electric telescopic rod (420) is extended to allow the sleeve (430) to slide down under the marking paint can (280), so that the puncture needle (450) penetrates the bottom wall of the marking paint can (280), and the air between the sleeve (430) and the marking paint can (280) enters the marking paint can (280) through the pressure transmission hole (451).

9. The paint can pressure applying device for a road marking vehicle according to claim 8, characterized in that: The pressurizing mechanism (400) further comprises a rotating frame (410), wherein the rotating frame (410) is rotatably connected to the connecting frame (210), the electric telescopic rod (420) is connected to the rotating frame (410), a piston cylinder (460) is connected to the rotating frame (410), a piston plate (480) is slidably connected inside the piston cylinder (460), a piston rod (470) is connected between the piston plate (480) and the sleeve (430), an air pipe (490) is connected between the space below the piston plate (480) in the piston cylinder (460) and the internal space of the sleeve (430), and a pressure stabilizing hole (491) is provided on the top wall of the piston cylinder (460).

10. The paint can pressure applying device for a road marking vehicle according to claim 9, characterized in that: The inner wall of the sleeve (430) is connected to a heating wire (440), and the heating wire (440) operates when the electric telescopic rod (420) is extended.

Images