A droplet device for dynamic marking of vehicle driving trajectories

Abstract

The application relates to the technical field of automobile testing devices, and discloses a liquid drop device for dynamically marking vehicle driving tracks, which comprises a water bag, a connecting head and a liquid delivery pipe, one end of the liquid delivery pipe is communicated with the water bag, the other end of the liquid delivery pipe is communicated with a liquid drop needle after passing through the connecting head, liquid in the water bag can be output from the liquid drop needle through the liquid delivery pipe, a liquid delivery mechanism is arranged in the connecting head, the liquid delivery mechanism comprises a motor and a plurality of squeezing rollers, the squeezing rollers have a gap with the connecting head, the liquid delivery pipe passes through the gap, the motor can drive the squeezing rollers to rotate, and the squeezing rollers can squeeze the liquid delivery pipe to output the liquid in the water bag, a controller is electrically connected with the motor, and the controller can control the motor to be turned on or turned off, one end of a universal arm is connected with a vehicle, and the liquid drop needle is arranged at the other end of the universal arm. The liquid drop device has the advantages of convenient control, clear marking, good marking stability and wide application range.

Description

Technical Field

[0001] This invention relates to the field of automotive testing equipment technology, and in particular to a dripping device for dynamic marking of vehicle driving trajectories. Background Technology

[0002] When conducting car tests, it is sometimes necessary to trace the vehicle's driving trajectory.

[0003] The simplest existing method for tracing a vehicle's trajectory is to place a water / paint bottle on the vehicle, with a corresponding drip hole at the bottle opening, and hang the bottle upside down under the car. When the vehicle moves, the water / paint in the bottle drips from the drip hole at the bottle opening, leaving water / paint marks on the ground for easy inspection by test personnel.

[0004] While the drip bottle method is the simplest, it has several drawbacks. For example, the dripping dots are clear at low speeds, but become unclear or even interrupted at high speeds. The dripping speed is uncontrollable and lacks automation. Furthermore, it cannot effectively control the dripping speed based on the viscosity of the paint in the bottle; when the paint is viscous, the dripping is too slow. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide a dripping device for dynamic marking of vehicle driving trajectory that is easy to control, provides clear marking, has good stability, and has a wide range of applications.

[0006] The technical solution adopted by this invention to solve its technical problem is to propose a dripping device for dynamic marking of vehicle driving trajectory, comprising:

[0007] A water bag is provided with a connector and an infusion tube. One end of the infusion tube is connected to the water bag, and the other end of the infusion tube is connected to a drip needle after passing around the connector. The liquid in the water bag can be output from the drip needle through the infusion tube.

[0008] An infusion mechanism is provided in the connector. The infusion mechanism includes a motor and several squeezing rollers. There is a gap between the squeezing rollers and the connector. The infusion tube passes through the gap. The motor can drive the squeezing rollers to rotate. The squeezing rollers can squeeze the infusion tube to output the liquid in the water bag.

[0009] A controller, electrically connected to the motor, is capable of controlling the motor to turn on or off.

[0010] A universal arm, one end of which is connected to the vehicle, and a drip needle is located at the other end of the universal arm.

[0011] Furthermore, the plurality of extrusion rollers include a first extrusion roller, a second extrusion roller, and a third extrusion roller, all of which are mounted between two mounting plates, and the output shaft of the motor is connected to one of the mounting plates;

[0012] When the motor drives the mounting plate to rotate, the first, second, and third extrusion rollers can all squeeze the infusion tube.

[0013] Furthermore, the first extrusion roller, the second extrusion roller, and the third extrusion roller are each mounted between the two mounting plates via a central shaft. The mounting plates are provided with a first mounting hole and a second mounting hole for mounting the central shaft. The first mounting hole and the second mounting hole are connected, and the central shaft can be switched between the first mounting hole and the second mounting hole.

[0014] When the central shaft passes through the first mounting hole, there is a first gap between the extrusion roller and the connector. When the central shaft passes through the second mounting hole, there is a second gap between the extrusion roller and the connector. The first gap is larger than the second gap.

[0015] Furthermore, the output shaft of the motor is connected to the center of the mounting plate, and the first extrusion roller, the second extrusion roller, and the third extrusion roller are evenly distributed along the circumference of the mounting plate.

[0016] Furthermore, there is a limiting wall between the first mounting hole and the second mounting hole, and the central shaft moves against the limiting wall. When the force acting on the central shaft reaches a preset value, the central shaft can switch between the first mounting hole and the second mounting hole along the limiting wall.

[0017] Furthermore, it also includes a follower vehicle linked to the vehicle, and the dripping needle is also mounted on the follower vehicle, with the dripping needle at a preset height from the ground.

[0018] Furthermore, the predetermined height of the dripping needle from the ground is between 5 mm and 10 mm.

[0019] Furthermore, the universal arm includes a support rod, a connecting rod, and a universal joint. The support rod and the connecting rod are connected through the universal joint, and both the support rod and the connecting rod can rotate along the universal joint.

[0020] The end of the connecting rod away from the universal joint is provided with a connecting joint, and the dripping needle is disposed on the connecting joint.

[0021] Furthermore, both the support rod and the connecting rod have ball heads at their ends near the universal joint, forming a first spherical pair between the support rod and the universal joint, and a second spherical pair between the connecting rod and the universal joint.

[0022] Furthermore, the controller, the water bag, and the universal arm are all equipped with connection structures that can be connected to the vehicle; the water bag is a flexible water bag, and its volume decreases when the liquid in the water bag decreases.

[0023] The water bag includes a first inner cavity and a second inner cavity that are adjacent to each other; the infusion tube includes a first branch section, a second branch section and a main section, one end of the first branch section and the second branch section are respectively connected to the first inner cavity and the second inner cavity, and the other end of the first branch section and the second branch section are both connected to the main section, and the drip needle is connected to the main section; wherein, the connector is provided with a first switch and a second switch for controlling the first branch section and the second branch section to be open or closed respectively.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] In this invention, the liquid in the water bag is dripped from the drip needle along the infusion tube by the infusion mechanism. The dripping is controlled by turning the motor on or off, resulting in a high degree of automation. Specifically, when the vehicle speed is slow or the required dotting interval is long, the motor can be controlled at a low speed; when the vehicle speed is fast or the required dotting interval is short, the motor can be controlled at a high speed to ensure clear dotting and convenient control of the dripping device. A universal arm controls the dotting position of the drip needle, ensuring omnidirectional dotting. Furthermore, when dotting with high-viscosity paint in the water bag, the slow flow rate of the paint can be controlled by adjusting the motor speed and switching the mounting position of the central shaft on the extrusion roller from the first mounting hole to the second mounting hole, ensuring that the high-viscosity paint can drip quickly from the drip needle along the infusion tube. This wide range of applications makes the dripping device suitable for various applications.

[0026] In this invention, a following vehicle is installed, linked to the vehicle, and the dripping needle is mounted on the following vehicle. During vehicle movement, the dripping needle is kept approximately 5 to 10 millimeters above the ground. This ensures the needle does not touch the ground and maintains a low height, resulting in clear and accurate dotting without drip drift. The dripping device produces clear and stable dotting. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the dripping device of the present invention;

[0028] Figure 2 This is an assembly diagram of the connector, infusion tubing, and infusion mechanism;

[0029] Figure 3 for Figure 2 A schematic diagram of the structure after removing the connector;

[0030] Figure 4 This is a schematic diagram of the assembly of the extrusion roller and the mounting plate;

[0031] Figure 5 This is an assembly diagram of the drip needle, universal arm, and follow-up vehicle;

[0032] Figure 6 for Figure 5 A plan view;

[0033] Figure 7 This is a schematic diagram of the universal joint structure;

[0034] Figure 8 This is a schematic diagram of the water bag structure in Example 2;

[0035] Figure 9 This is a half-sectional view of the water bag after the connector has been removed in Example 2;

[0036] Figure 10 This is a schematic diagram of the assembly of the first switch, the second switch, and the infusion tube in Embodiment 2.

[0037] In the picture:

[0038] 1. Water bag; 10. Connector; 11. Infusion tube; 12. Drip needle; 13. First switch; 14. Second switch; 101. First inner cavity; 102. Second inner cavity; 110. Main pipe section; 111. First branch pipe section; 112. Second branch pipe section;

[0039] 2. Infusion mechanism; 20. Motor; 21A. First squeeze roller; 21B. Second squeeze roller; 21C. Third squeeze roller; 22. Mounting plate; 23. Central shaft; 220. Limiting wall; 221. First mounting hole; 222. Second mounting hole;

[0040] 3. Controller;

[0041] 4. Universal arm; 41. Support rod; 42. Connecting rod; 43. Universal joint; 44. Connecting joint; 412. Ball head; 431. First clamp; 432. Second clamp; 433. Screw;

[0042] 5. Follow the vehicle. Detailed Implementation

[0043] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0045] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0048] Example 1:

[0049] like Figure 1 As shown, a dripping device for dynamic marking of vehicle driving trajectory mainly includes: a water bag 1, an infusion mechanism 2, a controller 3, a universal arm 4, and a following vehicle 5. Water in the water bag 1 is drawn out through an infusion tube 11 and dripped out through a dripping needle 12 to form dot marks on the ground.

[0050] The water bag 1 is equipped with a connector 10 and an infusion tube 11. The connector 10 is detachably connected to the water bag 1, for example, by a threaded connection, to facilitate the injection of liquid into the water bag 1 and the disassembly and reassembly of the connector 10. One end of the infusion tube 11 is connected to the water bag 1, and the other end of the infusion tube 11 passes around the connector 10 and is connected to a drip needle 12. The connector 10 has a hollow cylindrical structure, and the infusion tube 11 runs approximately around the inner wall of the connector 10. Preferably, a shallow groove is formed on the inner wall of the connector 10 to facilitate the positioning of the infusion tube 11. The liquid in the water bag 1 can be output from the drip needle 12 through the infusion tube 11. Depending on the experimental needs, water, paint, or other liquids can be placed in the water bag 1. Specifically, the water bag 1 is a flexible water bag 1. When the liquid in the water bag 1 decreases, the volume of the water bag 1 decreases, and the flexible water bag 1 facilitates the complete discharge or expulsion of the liquid in the water bag 1.

[0051] like Figures 1-4 As shown, the infusion mechanism 2 is disposed in the connector 10. The infusion mechanism 2 includes a motor 20 and several squeezing rollers. There is a gap between the squeezing rollers and the connector 10, specifically a gap between the squeezing rollers and the inner wall of the connector 10, to prevent the connector 10 from interfering with the rotation of the squeezing rollers. The infusion tube 11 passes through the gap. The motor 20 drives the squeezing rollers to rotate, and the squeezing rollers squeeze the infusion tube 11 to output the liquid from the water bag 1. The squeezing rollers output water from the water bag 1 by squeezing the infusion tube 11. For a single squeezing roller, the squeezing roller is eccentrically positioned relative to the output shaft of the motor 20. When there is only one squeezing roller, the intermittent time during liquid delivery is relatively long.

[0052] Preferably, in this embodiment, the plurality of squeezing rollers include a first squeezing roller 21A, a second squeezing roller 21B, and a third squeezing roller 21C. The first squeezing roller 21A, the second squeezing roller 21B, and the third squeezing roller 21C are all mounted between two mounting plates 22. The output shaft of the motor 20 is connected to one of the mounting plates 22. The mounting plates 22 are circular, and the output shaft of the motor 20 is connected to the center of the mounting plate 22. The first squeezing roller 21A, the second squeezing roller 21B, and the third squeezing roller 21C are evenly distributed along the circumference of the mounting plate 22. When the motor 20 drives the mounting plate 22 to rotate, the first squeezing roller 21A, the second squeezing roller 21B, and the third squeezing roller 21C can all squeeze the infusion tube 11. During use, the motor 20 rotates, causing the mounting plate 22 to rotate. The three squeezing rollers are evenly arranged along the circumference of the mounting plate 22, with a phase angle difference of 120 degrees between adjacent squeezing rollers. The three squeezing rollers take turns squeezing the infusion tube 11. For every revolution of the motor 20, the three squeezing rollers squeeze the infusion tube 11 at least once to ensure delivery efficiency.

[0053] The first extrusion roller 21A, the second extrusion roller 21B, and the third extrusion roller 21C are each mounted between two mounting plates 22 via a central shaft 23. Each mounting plate 22 has a first mounting hole 221 and a second mounting hole 222 for mounting the central shaft 23; that is, one mounting plate 22 has three first mounting holes 221 and three second mounting holes 222. The center distance between the first mounting hole 221 and the mounting plate 22 is smaller than the center distance between the second mounting hole 222 and the mounting plate 22. Furthermore, the first mounting hole 221 and the second mounting hole 222 are connected, and the central shaft 23 can switch between the first mounting hole 221 and the second mounting hole 222. In other words, when the central shaft 23 passes through the first mounting hole 221, there is a first gap between the extrusion roller and the connector 10; when the central shaft 23 passes through the second mounting hole 222, there is a second gap between the extrusion roller and the connector 10. The first gap is larger than the second gap. Under otherwise identical conditions, switching the center shaft 23 on the three extrusion rollers to the second mounting hole 222 results in higher conveying efficiency and is suitable for high-viscosity liquids compared to switching the center shaft 23 on the three extrusion rollers to the first mounting hole 221.

[0054] A limiting wall 220 is provided between the first mounting hole 221 and the second mounting hole 222. The central shaft 23 abuts against the limiting wall 220. When the force acting on the central shaft 23 reaches a preset value, the central shaft 23 can switch between the first mounting hole 221 and the second mounting hole 222 along the limiting wall 220. The limiting wall 220 is arc-shaped, which ensures that the central shaft 23 can work normally whether it is in the first mounting hole 221 or the second mounting hole 222, and will not spontaneously shift. It also allows the central shaft 23 to be switched between the first mounting hole 221 and the second mounting hole 222 under the action of manually applied external force, making operation convenient.

[0055] In practical use, the liquid in the water bag 1, under the action of the infusion mechanism 2, can drip from the drip needle 12 along the infusion tube 11. The dripping or non-drip function can be controlled by turning the motor 20 on or off, resulting in a high degree of automation. Specifically, when the vehicle speed is slow or the required dotting interval is long, the motor 20 can be controlled at a low speed; when the vehicle speed is fast or the required dotting interval is short, the motor 20 can be controlled at a high speed to ensure clear dotting and convenient control of the dripping device. Furthermore, when using high-viscosity paint in the water bag 1 for dotting, since the high-viscosity paint has a slow flow rate, the speed of the motor 20 can be controlled, and the mounting position of the central shaft 23 on the extrusion roller can be switched from the first mounting hole 221 to the second mounting hole 222 to ensure that the high-viscosity paint can drip quickly from the drip needle 12 along the infusion tube 11. The dripping device has a wide range of applications.

[0056] The controller 3 is electrically connected to the motor 20, and this connection can be made via, but is not limited to, a wire. The controller 3 can control the motor 20 to turn on or off, and can also control the speed of the motor 20. The controller 3 can be remotely controlled, allowing the operator to control it at any time.

[0057] One end of the universal arm 4 is connected to the vehicle, and the drip needle 12 is located at the other end of the universal arm 4. Specifically, the controller 3, the water bag 1, and the universal arm 4 are all equipped with a connection structure that can be connected to the vehicle for quick installation on the bottom of the vehicle. The controller 3 and the water bag 1 can be suspended from the bottom of the vehicle, for example, using hooks; while the universal arm 4 needs to be fixedly connected to the chassis, for example, by bolts, screws, or magnets.

[0058] like Figures 5-7As shown, the universal arm 4 includes a support rod 41, a connecting rod 42, and a universal joint 43. The support rod 41 and the connecting rod 42 are connected by the universal joint 43, and both the support rod 41 and the connecting rod 42 can rotate along the universal joint 43. A connecting joint 44 is provided at the end of the connecting rod 42 away from the universal joint 43. The drip needle 12 is disposed on the connecting joint 44. One end of the connecting head 10 is connected to the connecting rod 42, and the other end of the connecting rod 42 clamps the drip needle 12. Both the support rod 41 and the connecting rod 42 have ball heads 412 at the ends near the universal joint 43. A first spherical joint is formed between the support rod 41 and the universal joint 43, and a second spherical joint is formed between the connecting rod 42 and the universal joint 43. The universal joint 43 includes a first clamp 431 and a second clamp 432. A screw 433 connects the first clamp 431 and the second clamp 432. Rotating the screw 433 clockwise brings the two closer together to clamp the ball head 412, while rotating the screw 433 counterclockwise moves them apart to remove the ball head 412 from the universal joint 43, making disassembly and assembly convenient. The universal arm 4 allows for control of the dotting position of the drip needle 12, ensuring that the dripping device can perform dotting from all directions.

[0059] Preferably, the dripping device further includes a following vehicle 5 that is linked to the vehicle. The following vehicle 5 moves with the vehicle, and the dripping needle 12 is also mounted on the following vehicle 5, with the dripping needle 12 at a preset height from the ground. Specifically, the preset height of the dripping needle 12 from the ground is between 5 mm and 10 mm.

[0060] In practical use, this dripping device is equipped with a following vehicle 5 that is linked to the vehicle, and the dripping needle 12 is installed on the following vehicle 5. During vehicle movement, the dripping needle 12 is kept at a distance of approximately 5 to 10 millimeters from the ground. This ensures that the dripping needle 12 does not touch the ground and that the height of the dripping needle 12 from the ground is low, resulting in clear and accurate dotting without drip drift. The dripping device produces clear and stable dotting.

[0061] Example 2:

[0062] like Figures 8-10 As shown, another embodiment of the present invention is different from the first embodiment in that: in this embodiment, the single-cavity water bag 1 is changed to a double-cavity water bag 1. The first inner cavity 101 and the second inner cavity 102 can respectively hold water and paint, and a first switch 13 and a second switch 14 are respectively provided on the connector 10. The first switch 13 and the second switch 14 are used to control the output of water and paint, respectively.

[0063] Specifically, the water bag 1 includes a first inner cavity 101 and a second inner cavity 102 that are adjacent to each other. A water-separating plate can be installed in the water bag 1 to divide the single cavity into two cavities. The infusion tube 11 includes a first branch section 111, a second branch section 112, and a main section 110. One end of the first branch section 111 and the second branch section 112 are respectively connected to the first inner cavity 101 and the second inner cavity 102, and the other end of the first branch section 111 and the second branch section 112 are both connected to the main section 110. The drip needle 12 is connected to the main section 110. The connector 10 is provided with a first switch 13 and a second switch 14 for controlling the opening or closing of the first branch section 111 and the second branch section 112.

[0064] In actual use, the first branch pipe section 111 and the second branch pipe section 112 converge at the main pipe section 110. The first switch 13 controls the opening or closing of the first branch pipe section 111; the second switch 14 controls the opening or closing of the second branch pipe section 112. Both the first switch 13 and the second switch 14 can be screw-type switches, with a knob on the screw for easy rotation. By rotating the knob, the adjustment knob can be extended or retracted, thereby controlling the amount of fluid squeezed from the first branch pipe section 111 or the second branch pipe section 112. Since the infusion tube 11 is entirely made of flexible tubing, the degree of compression of the first branch pipe section 111 or the second branch pipe section 112 by the screw on the first switch 13 or the second switch 14 can also control the output of liquid in the first inner cavity 101 and the second inner cavity 102, making control convenient.

[0065] In this design, the dripping device is easy to control, produces clear drips, has good drip stability, and is widely applicable.

Claims

1. A dripping device for dynamic marking of vehicle trajectory, characterized in that, include: A water bag is provided with a connector and an infusion tube. One end of the infusion tube is connected to the water bag, and the other end of the infusion tube is connected to a drop needle after passing around the connector. The liquid in the water bag can be output from the drop needle through the infusion tube. An infusion mechanism is disposed in the connector. The infusion mechanism includes a motor and several squeezing rollers. There is a gap between the squeezing rollers and the connector. The infusion tube passes through the gap. The motor can drive the squeezing rollers to rotate. The squeezing rollers can squeeze the infusion tube to output the liquid in the water bag. A controller, electrically connected to the motor, is capable of controlling the motor to turn on or off. A universal arm, one end of which is connected to the vehicle, and a drip needle is disposed at the other end of the universal arm; The universal arm includes a support rod, a connecting rod, and a universal joint. The support rod and the connecting rod are connected through the universal joint, and both the support rod and the connecting rod can rotate along the universal joint. The connecting rod is provided with a connecting joint at the end away from the universal joint, and the dripping needle is disposed on the connecting joint; Both the support rod and the connecting rod have ball heads at one end near the universal joint, forming a first spherical joint between the support rod and the universal joint, and a second spherical joint between the connecting rod and the universal joint. The universal joint includes a first clamp and a second clamp, and a screw connecting the two clamps is provided between the first clamp and the second clamp. Rotating the screw clockwise can bring the two clamps closer together to clamp the ball head, and rotating the screw counterclockwise can move the two clamps apart to remove the ball head from the universal joint. The universal arm controls the dotting position of the dispensing needle, enabling the dispensing device to perform dotting from all directions.

2. The dripping device for dynamic marking of vehicle driving trajectory according to claim 1, characterized in that, The plurality of extrusion rollers include a first extrusion roller, a second extrusion roller, and a third extrusion roller, all of which are mounted between two mounting plates, and the output shaft of the motor is connected to one of the mounting plates; When the motor drives the mounting plate to rotate, the first, second, and third extrusion rollers can all squeeze the infusion tube.

3. The dripping device for dynamic marking of vehicle driving trajectory according to claim 2, characterized in that, The first extrusion roller, the second extrusion roller, and the third extrusion roller are each mounted between the two mounting plates via a central shaft. The mounting plates are provided with a first mounting hole and a second mounting hole for mounting the central shaft. The first mounting hole and the second mounting hole are connected, and the central shaft can switch between the first mounting hole and the second mounting hole. When the central shaft passes through the first mounting hole, there is a first gap between the extrusion roller and the connector. When the central shaft passes through the second mounting hole, there is a second gap between the extrusion roller and the connector. The first gap is larger than the second gap.

4. The dripping device for dynamic marking of vehicle driving trajectory according to claim 2 or 3, characterized in that, The mounting plate is circular, and the output shaft of the motor is connected to the center of the mounting plate. The first extrusion roller, the second extrusion roller, and the third extrusion roller are evenly distributed along the circumference of the mounting plate.

5. The dripping device for dynamic marking of vehicle driving trajectory according to claim 3, characterized in that, There is a limiting wall between the first mounting hole and the second mounting hole. The central shaft moves against the limiting wall. When the force acting on the central shaft reaches a preset value, the central shaft can switch between the first mounting hole and the second mounting hole along the limiting wall.

6. The dripping device for dynamic marking of vehicle driving trajectory according to claim 1, characterized in that, It also includes a follower vehicle that is linked to the vehicle, and the dripping needle is also mounted on the follower vehicle, with the dripping needle at a preset height from the ground.

7. The dripping device for dynamic marking of vehicle driving trajectory according to claim 6, characterized in that, The distance between the dripping needle and the ground is a preset height of 5 mm to 10 mm.

8. The dripping device for dynamic marking of vehicle driving trajectory according to claim 1, characterized in that, The controller, the water bag, and the universal arm are all equipped with connection structures that can be connected to the vehicle; the water bag is a flexible water bag, and its volume decreases when the liquid in the water bag decreases. The water bag includes a first inner cavity and a second inner cavity that are adjacent to each other; the infusion tube includes a first branch section, a second branch section and a main section, one end of the first branch section and the second branch section are respectively connected to the first inner cavity and the second inner cavity, and the other end of the first branch section and the second branch section are both connected to the main section, and the drip needle is connected to the main section; wherein, the connector is provided with a first switch and a second switch for controlling the first branch section and the second branch section to be open or closed respectively.

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