Sprinkling device for cold recycling machine of asphalt pavement with self-cleaning function

Abstract

The present invention discloses a sprinkling device for an asphalt pavement cold recycling machine with a self-cleaning function, which includes a rotor cover and a sprinkling device. The sprinkling device is installed above the rotor cover. The sprinkling device includes a sprinkling oil cylinder, a water spraying box and a reversing valve. There is a water outlet below the water spraying box, and there is a through hole on the rotor cover. When the piston rod of the sprinkling oil cylinder extends, it sequentially penetrates through the water outlet and the through hole. The reversing valve is connected to the sprinkling oil cylinder. A push plate is arranged inside the rotor cover, and the push plate is movably connected to the rotor cover through a reset assembly. There is a push plate through hole on the push plate, and the push plate through hole is communicated with the through hole on the rotor cover. The piston rod of the sprinkling oil cylinder pushes the push plate to move downward. Beneficial effects: The present invention can expand the cleaning area inside the rotor cover, effectively improving the cleaning effect; it can be cleaned in time without stopping the pavement cold recycling machine, effectively improving the working efficiency and ensuring the mixing effect.

Description

Technical Field

[0001] The present invention relates to a water spraying device for material mixing in an asphalt pavement cold recycler, and particularly to a water spraying device for an asphalt pavement cold recycler with a self-cleaning function, belonging to the technical field of road surface equipment. Background Art

[0002] An asphalt pavement cold recycler is a multi-functional construction machine. It is mainly used for the upgrading and transformation of old asphalt pavements, that is, cold recycling of the base layer. Its construction process is to add a certain amount of additives to the old asphalt pavement at normal temperature, use the asphalt pavement cold recycler to mill, crush the old pavement, mix the milled waste materials with the newly added mixture evenly, and pave it in place. After being compacted by a roller, the base layer or sub-base layer of the renovated pavement is formed. Its additives are mainly powdered cement, and an appropriate amount of water is added during the milling process. The amount of water content directly affects the regeneration quality of the road surface structure layer. If the water content is too small, the cement cannot be fully dissolved and solidified, and the bonding strength of the mixture is low, seriously affecting the strength of the road surface base layer; if the water content is too large, it is difficult to be rolled into shape, and even causes shrinkage cracks in the structural layer. Therefore, strictly controlling the total amount of water sprayed by the water pump of the cold recycler and the uniform spraying of the water spraying system of the water spraying box to ensure that the mixture evenly reaches the optimal water content is of great significance to the regeneration quality of the asphalt pavement. Among them, the spraying uniformity is achieved by evenly arranged spray holes with the same diameter on the water spraying box, and the opening and closing of the spray holes are controlled by a water spraying oil cylinder. During the process of the working rotor of the recycler milling and mixing to form a new mixture, due to the mixture having a certain viscosity and moving at a high speed, it is extremely easy to adhere to the inner side of the working cavity (rotor cover), often blocking the spray holes. Especially during half-width construction, some water holes are extremely easy to be blocked due to not spraying water for a long time, resulting in uneven water spraying. Moreover, manual cleaning is time-consuming, laborious and unsafe, seriously affecting the construction efficiency and quality.

[0003] Chinese Patent CN203569426 discloses an anti-blocking cold recycling spraying pipe. This invention patent uses a double-stroke oil cylinder. When it is found that there is coagulated material blockage at the material outlet during use, the piston rod of the oil cylinder can extend outside the valve seat to clean the material near the spray port. However, the diameter of the piston rod is small, and only a sunken hole with the diameter of the piston rod can be formed after extending out of the spraying port, and the material originally adhered to the inside of the rotor cover still cannot fall off, so the cleaning effect is not good. And for the situation of finding material blockage at the water outlet, it is only found when the blockage is relatively serious. Therefore, the blockage of the water outlet cannot be discovered and processed in time, there is a lag, which will directly affect the effect of material mixing. Summary of the Invention

[0004] Object of the Invention: The object of the present invention is to provide a water spraying device for an asphalt pavement cold recycler with a self-cleaning function in view of the problems of poor cleaning effect and inability to clean in time at the water spraying port in the prior art.

[0005] Technical solution: A sprinkler device for an asphalt pavement cold recycling machine with a self-cleaning function, including a rotor cover and a spraying device. The spraying device is installed above the rotor cover. The spraying device includes a sprinkler cylinder, a water spraying box, and a reversing valve. The sprinkler cylinder is installed above the water spraying box. The water spraying box is fixed on the rotor cover. There is a water outlet below the water spraying box. There is a through hole on the rotor cover that communicates with the water outlet. When the piston rod of the sprinkler cylinder extends, it sequentially passes through the water outlet and the through hole on the rotor cover. The reversing valve is connected to the sprinkler cylinder. There is a push plate inside the rotor cover. There are reset components at both ends of the push plate. The push plate is movably connected to the rotor cover through the reset components. The push plate is tightly attached to the inner side of the rotor cover under the action of the reset components. There is a push plate through hole on the push plate. The push plate through hole communicates with the through hole on the rotor cover. The piston rod of the sprinkler cylinder pushes the push plate to move downward.

[0006] In the present invention, the piston rod of the sprinkler cylinder pushes the push plate to move downward, which can expand the cleaning area inside the rotor cover. It can not only clean the sticky materials at the water outlet, but also clean the sticky materials around the water outlet. Even the sticky materials around the water outlet will fall off as a whole, effectively improving the cleaning effect. And when the piston rod of the sprinkler cylinder retracts, it does not affect the spraying effect.

[0007] Priority item. In order to achieve the effect of repeated cleaning, and simplify the structure and reduce costs, the reset component includes a reset spring, a connecting bolt, and a connecting nut. The connecting bolt sequentially passes through the push plate, the rotor cover, and the reset spring from bottom to top and is connected to the connecting nut. When the piston rod of the sprinkler cylinder retracts, the push plate returns to the state of being tightly attached to the inner side wall of the rotor cover under the action of the reset spring. And the pre-tightening force of the reset spring can be adjusted through the connecting nut. Under the action of the pre-tightening force of the reset spring and the water pressure, the materials entering between the push plate and the rotor cover can be squeezed and cleaned.

[0008] Preferred item. In order to realize the switching function of the sprinkler cylinder sprinkler device and the cleaning function of the water spraying port at the same time, the sprinkler cylinder includes a piston rod, a cylinder barrel, and a piston. The piston rod is fixedly connected to the piston. The piston is installed inside the cylinder barrel and can move up and down. The piston divides the cylinder barrel into an upper chamber and a lower chamber.

[0009] There is an oil port A on the cylinder barrel that communicates with the upper chamber and an oil port B that communicates with the lower chamber. The oil port A and the oil port B are respectively connected to the reversing valve.

[0010] There is an upper chamber spring inside the upper chamber. Both ends of the upper chamber spring are respectively connected to the upper part of the piston and the inner top wall of the cylinder barrel. There is a lower chamber spring inside the lower chamber. Both ends of the lower chamber spring are respectively connected to the lower part of the piston and the inner wall of the bottom of the cylinder barrel. The piston rod passes through the lower chamber spring and then extends out of the cylinder barrel.

[0011] When the oil pressures in the upper cavity and the lower cavity are equal, the piston is in the initial position under the combined action of the upper cavity spring and the lower cavity spring. When the piston is in the initial position, the piston rod is inserted into the water outlet. At this time, the sprinkler device is in the closed state, and the high-pressure water in the water box cannot enter the inner side of the rotor cover.

[0012] When the hydraulic oil enters the lower cavity from the oil port B, and at the same time the hydraulic oil in the upper cavity flows out from the oil port A, the hydraulic oil overcomes the pressure of the upper cavity spring and pushes the piston together with the piston rod upward. The piston rod is pulled out of the water outlet, and the water in the water spraying box is sprayed into the inner side of the rotor cover in sequence through the water outlet, the through hole and the push plate through hole. At this time, the sprinkler device is in the open state.

[0013] When the hydraulic oil enters the upper cavity from the oil port A, and at the same time the hydraulic oil in the lower cavity flows out from the oil port B, the hydraulic oil overcomes the pressure of the lower cavity spring and pushes the piston together with the piston rod downward. The piston rod passes through the water outlet and pushes the push plate downward. The push plate separates or even detaches the material adhering near the push plate from the inner wall of the rotor cover, and the milling drum of the road cold recycler will take away the protruding material, achieving a better cleaning effect.

[0014] Preferred option, in order to be able to detect the blockage of the water outlet in time and clean it, the reversing valve is controlled by a controller. A pressure sensor is arranged in the water spraying box, and the signal of the pressure sensor is transmitted to the controller. When the milling drum of the road cold recycler is working, it needs to continuously spray water. When the spraying pressure increases, it means that there is a blockage in the water outlet; a critical pressure value is set in the controller. When the detected pressure value is greater than the set critical pressure value, it will affect the water spraying amount and further affect the mixing effect. At this time, the controller controls the sprinkler cylinder to drive the push plate to clean through the reversing valve.

[0015] Preferred option, in order to be able to detect the blockage of the water outlet in time and clean it, the reversing valve is controlled by a controller. A flow sensor is arranged at the water inlet of the water spraying box, and the signal of the flow sensor is transmitted to the controller. When the milling drum of the road cold recycler is working, it needs to continuously spray water. When the water spraying amount decreases, it means that there is a blockage in the water outlet; a critical flow value is set in the controller. When the detected flow value is less than the set critical flow value, it will affect the water spraying amount and further affect the mixing effect. At this time, the controller controls the sprinkler cylinder to drive the push plate to clean through the reversing valve.

[0016] Preferred option: In order to detect and clean the blockage of the water outlet in a more timely manner, the reversing valve is controlled by a controller. A pressure sensor is provided inside the water spraying box, and the signal of the pressure sensor is transmitted to the controller; a flow sensor is provided at the water inlet of the water spraying box, and the signal of the flow sensor is transmitted to the controller. When the milling drum of the cold in-place recycling machine is operating, water spraying needs to be continuously carried out. When the water spraying pressure increases while the water spraying volume decreases, it indicates that a water outlet is blocked; critical pressure values and critical flow values are respectively set in the controller, and the detected pressure value and flow value are comprehensively judged with the set critical pressure value and critical flow value, so as to more accurately and timely detect the problem of water outlet blockage. At this time, the controller controls the sprinkler oil cylinder through the reversing valve to drive the push plate to clean up.

[0017] Preferred option: In order to detect and clean the blocked water outlet in a timely and accurate manner without affecting the water spraying of other water outlets, the water spraying boxes are independently installed above the rotor cover, and at least two sprinkler oil cylinders are installed on each water spraying box. This solution is to install all the sprinkler oil cylinders in a water spraying box divided into multiple independent water spraying boxes, and at least two sprinkler oil cylinders are installed on each water spraying box. Then, according to the water flow or pressure or both in the water spraying box where it is located, it is judged whether the water outlet of this water spraying box is blocked. If it is judged to be blocked, only the sprinkler oil cylinder installed on this water spraying box needs to be controlled to clean up, which has no impact on other water spraying boxes, and the cold in-place recycling machine can work normally; and the judgment structure based on flow and pressure is more accurate and reliable; the working efficiency and mixing effect of the cold in-place recycling machine are improved.

[0018] Preferred option: In order to further improve the cleaning effect, a connecting plate is provided between adjacent push plates driven by the sprinkler oil cylinders on the same water spraying box. Connecting the adjacent push plates driven by the sprinkler oil cylinders on the same water spraying box through the connecting plate can effectively expand the cleaning range and improve the cleaning efficiency.

[0019] Beneficial effects: The piston rod of the sprinkler oil cylinder of the present invention pushes the push plate to move downward, which can expand the cleaning area inside the rotor cover. It can not only clean the sticky materials at the water outlet, but also clean the sticky materials around the water outlet, and even make the sticky materials around the water outlet fall off as a whole, effectively improving the cleaning effect; by monitoring the water pressure and flow in the water spraying box to judge the blockage of the water outlet and cleaning it in time, it can be cleaned in time without stopping the cold in-place recycling machine, effectively improving the working efficiency and ensuring the mixing effect. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0021] Figure 1 Schematic diagram of the installation position of the sprinkler device of the present invention;

[0022] Figure 2 Schematic diagram of the structure of the water outlet spraying state of the present invention;

[0023] Figure 3 Schematic diagram of the structure of the water outlet cleaning state of the present invention;

[0024] Figure 4 Schematic diagram of the structure of the water outlet closed state of the present invention;

[0025] Figure 5 Schematic diagram of the structure of the integral water spraying box of the present invention;

[0026] Figure 6 Control principle diagram of the sprinkler oil cylinder of the present invention;

[0027] Figure 7 Schematic diagram of the structure of the split water spraying box of the present invention;

[0028] Figure 8 Bottom view of the installation of three sprinkler oil cylinders on the water spraying box of the present invention. Detailed implementation manners

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are 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 thus should not be construed as a limitation to the present invention.

[0031] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly under and obliquely under the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0032] As Figure 1 , 2 , 3, and 4 show, a sprinkler device for an asphalt pavement cold recycling machine with a self-cleaning function, including a rotor cover 1 and a sprinkling device 2, wherein the sprinkling device 2 is installed above the rotor cover 1; the sprinkling device 2 includes a sprinkler cylinder 21, a water spraying box 22, and a reversing valve 23. The sprinkler cylinder 21 is installed above the water spraying box 22. The water spraying box 22 is fixed on the rotor cover 1. A water outlet 221 is provided below the water spraying box 22. A through hole 11 communicating with the water outlet 221 is provided on the rotor cover 1. When the piston rod 211 of the sprinkler cylinder 21 extends, it sequentially penetrates through the water outlet 221 and the through hole 11 on the rotor cover 1; the reversing valve 23 is connected to the sprinkler cylinder 21; a push plate 3 is provided inside the rotor cover 1. Reset components 4 are respectively provided at both ends of the push plate 3. The push plate 3 is movably connected to the rotor cover 1 through the reset components 4. The push plate 3 closely adheres to the inner side of the rotor cover 1 under the action of the reset components 4; a push plate through hole 31 is provided on the push plate 3. The push plate through hole 31 communicates with the through hole 11 on the rotor cover 1. The piston rod 211 of the sprinkler cylinder 21 pushes the push plate 3 to move downward.

[0033] In the present invention, the piston rod 211 of the sprinkler cylinder 21 pushes the push plate 3 to move downward, which can expand the cleaning area inside the rotor cover 1. It can not only clean the sticky materials at the water outlet 221, but also clean the sticky materials around the water outlet 221, and even make the sticky materials around the water outlet 221 fall off as a whole, effectively improving the cleaning effect; and when the piston rod 211 of the sprinkler cylinder 21 retracts, it does not affect the spraying effect.

[0034] In order to achieve the effect of repeated cleaning, simplify the structure and reduce costs, the reset component 4 includes a reset spring 41, a connecting bolt 42 and a connecting nut 43. The connecting bolt 42 passes through the push plate 3, the rotor cover 1 and the reset spring 41 from bottom to top in sequence and is connected to the connecting nut 43. When the piston rod 211 of the sprinkler oil cylinder 21 retracts, the push plate 3 returns to the state of being closely attached to the inner wall of the rotor cover 1 under the action of the reset spring 41, and the pre-tightening force of the reset spring 41 can be adjusted through the connecting nut 43. Under the action of the pre-tightening force of the reset spring 41 and the impact of water flow, the materials entering between the push plate 3 and the rotor cover 1 can be squeezed and cleaned up.

[0035] In order to realize the switching function of the sprinkler oil cylinder 21 for the sprinkler device and at the same time realize the cleaning function of the sprinkler orifice, the sprinkler oil cylinder 21 includes a piston rod 211, a cylinder barrel 212 and a piston 213. The piston rod 211 is fixedly connected to the piston 213; the piston 213 is installed in the cylinder barrel 212 and can move up and down. The piston 213 divides the cylinder barrel 212 into an upper chamber 214 and a lower chamber 215;

[0036] The cylinder barrel 212 is provided with an oil port A communicating with the upper chamber 214 and an oil port B communicating with the lower chamber 215. The oil port A and the oil port B are respectively communicated with the reversing valve 23;

[0037] An upper chamber spring 216 is arranged in the upper chamber 214. Both ends of the upper chamber spring 216 are connected to the upper part of the piston 213 and the inner top wall of the cylinder barrel 212 respectively; a lower chamber spring 217 is arranged in the lower chamber 215. Both ends of the lower chamber spring 217 are connected to the lower part of the piston 213 and the inner wall of the bottom of the cylinder barrel 212 respectively. The piston rod 211 passes through the lower chamber spring 217 and then extends out of the cylinder barrel 212;

[0038] When the oil pressures in the upper chamber 214 and the lower chamber 215 are equal, the piston 213 is in the initial position under the combined action of the upper chamber spring 216 and the lower chamber spring 217. When the piston 213 is in the initial position, the piston rod 211 is inserted into the water outlet 221; at this time, as Figure 4 shown, the sprinkler device is in the closed state, and the high-pressure water in the water spraying box 22 cannot enter the inside of the rotor cover 1;

[0039] When the hydraulic oil enters the lower chamber 215 from the oil port B, and at the same time the hydraulic oil in the upper chamber 214 flows out from the oil port A, the hydraulic oil overcomes the pressure of the upper chamber spring 216 and pushes the piston 213 together with the piston rod 211 to move upward. The piston rod 211 is pulled out from the water outlet 221, and the water in the water spraying box 22 is sprayed into the inside of the rotor cover 1 in sequence through the water outlet 221, the through hole 11 and the push plate through hole 31; at this time, as Figure 2 shown, the sprinkler device is in the water spraying open state;

[0040] As Figure 3As shown, when the hydraulic oil enters the upper chamber 214 from the oil port A, and at the same time the hydraulic oil in the lower chamber 215 flows out from the oil port B, the hydraulic oil overcomes the pressure of the lower chamber spring 217 and pushes the piston 213 together with the piston rod 211 downward. The piston rod 211 passes through the water outlet 221 and pushes the push plate 3 downward. The push plate 3 separates the materials adhered to the vicinity of the push plate 3 from the inner wall of the rotor cover 1, and the adhered materials even fall off. The milling drum of the road cold recycler will take away the protruding or fallen-off materials, achieving a better cleaning effect.

[0041] Embodiment 1

[0042] As Figure 5 and 6 shown, in order to be able to detect the blockage of the water outlet in time and clean it, the reversing valve 23 is controlled by the controller 5. A pressure sensor 6 is provided in the water spraying box 22, and the signal of the pressure sensor 6 is transmitted to the controller 5. When the milling drum of the road cold recycler is operating, continuous water spraying is required. When the water spraying pressure increases, it indicates that there is a blockage in the water outlet; a critical pressure value is set in the controller. When the detected pressure value is greater than the set critical pressure value, it will affect the water spraying amount and further affect the mixing effect. At this time, the controller 5 controls the sprinkler cylinder 21 through the reversing valve 23 to drive the push plate 3 to clean.

[0043] Embodiment 2

[0044] As Figure 5 and 6 shown, in order to be able to detect the blockage of the water outlet in time and clean it, the reversing valve 23 is controlled by the controller 5. A flow sensor 7 is provided at the water inlet of the water spraying box 22, and the signal of the flow sensor 7 is transmitted to the controller 5. When the milling drum of the road cold recycler is operating, continuous water spraying is required. When the water spraying amount decreases, it indicates that there is a blockage in the water outlet; a critical flow value is set in the controller 5. When the detected flow value is less than the set critical flow value, it will affect the water spraying amount and further affect the mixing effect. At this time, the controller 5 controls the sprinkler cylinder 21 through the reversing valve 23 to drive the push plate 3 to clean.

[0045] Embodiment 3

[0046] As Figure 5 and 6As shown in the figure, in order to detect the blockage of the water outlet in a more timely manner and clean it, the reversing valve 23 is controlled by the controller 5. A pressure sensor 6 is provided in the water spraying box 22, and the signal of the pressure sensor 6 is transmitted to the controller 5. A flow sensor 7 is provided at the water inlet of the water spraying box 22, and the signal of the flow sensor 7 is transmitted to the controller 5. When the milling drum of the road cold recycler is operating, water spraying needs to be continuously carried out. When the water spraying pressure increases while the water spraying volume decreases, it indicates that a water outlet is blocked. Critical pressure values and critical flow values are respectively set in the controller 5. By comprehensively judging the detected pressure value and flow value with the set critical pressure value and critical flow value, the problem of water outlet blockage can be detected more accurately and timely. At this time, the controller 5 controls the sprinkler cylinder 21 through the reversing valve 23 to drive the push plate 3 to clean.

[0047] Embodiment 4

[0048] As Figure 7 shown in the figure, in order to detect and clean the blocked water outlet in a timely and accurate manner, the water spraying boxes 22 are independently installed above the rotor cover 1, and at least two sprinkler cylinders 21 are installed on the water spraying boxes 22. In this embodiment, the scheme of installing all the sprinkler cylinders 21 on one water spraying box 22 is divided into a scheme of multiple independently installed water spraying boxes 22, and two sprinkler cylinders 21 are installed on each water spraying box. Then, according to the water flow or pressure or both in the water spraying box 22 where it is located, it is determined whether the water outlet of this water spraying box 22 is blocked. If it is determined to be blocked, only the sprinkler cylinder 21 installed on this water spraying box 22 needs to be controlled to clean, which has no impact on other water spraying boxes 22, and the road cold recycler can work normally. And the determination structure based on flow and pressure is more accurate and reliable, improving the working efficiency and mixing effect of the road cold recycler.

[0049] Embodiment 5

[0050] As Figure 8 shown in the figure, in order to further improve the cleaning effect, a connecting plate 8 is provided between adjacent push plates 3 driven by the sprinkler cylinder 21 on the same water spraying box 22. By connecting the adjacent push plates 3 driven by the sprinkler cylinder 21 on the same water spraying box 22 through the connecting plate 8, and connecting three push plates 3 with two connecting plates 8 to form a larger push plate, the cleaning range can be effectively expanded and the cleaning efficiency can be improved.

[0051] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and reference can be made to the description of the method part for related parts.

[0052] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sprinkler device for an asphalt pavement cold recycling machine with self-cleaning function, comprising a rotor cover (1) and a spraying device (2), wherein the spraying device (2) is installed above the rotor cover (1); the spraying device (2) includes a sprinkler oil cylinder (21), a water spraying box (22) and a reversing valve (23), the sprinkler oil cylinder (21) is installed above the water spraying box (22), the water spraying box (22) is fixed on the rotor cover (1), a water outlet (221) is arranged below the water spraying box (22), a through hole (11) communicated with the water outlet (221) is arranged on the rotor cover (1), and when the piston rod (211) of the sprinkler oil cylinder (21) extends, it sequentially penetrates through the water outlet (221) and the through hole (11) on the rotor cover (1); the reversing valve (23) is connected with the sprinkler oil cylinder (21). It is characterized in that: A push plate (3) is arranged inside the rotor cover (1), reset components (4) are respectively arranged at both ends of the push plate (3), the push plate (3) is movably connected with the rotor cover (1) through the reset components (4), and the push plate (3) is tightly attached to the inner side of the rotor cover (1) under the action of the reset components (4); a push plate through hole (31) is arranged on the push plate (3), the push plate through hole (31) is communicated with the through hole (11) on the rotor cover (1), and the piston rod (211) of the sprinkler oil cylinder (21) pushes the push plate (3) to move downward.

2. The sprinkler device for an asphalt pavement cold recycling machine with self-cleaning function according to claim 1, It is characterized in that: The reset component (4) includes a reset spring (41), a connecting bolt (42) and a connecting nut (43), and the connecting bolt (42) sequentially passes through the push plate (3), the rotor cover (1) and the reset spring (41) from bottom to top and then is connected with the connecting nut (43).

3. The sprinkler device for an asphalt pavement cold recycling machine with self-cleaning function according to claim 1, It is characterized in that: The sprinkler oil cylinder (21) includes a piston rod (211), a cylinder barrel (212) and a piston (213), and the piston rod (211) is fixedly connected with the piston (213); the piston (213) is installed inside the cylinder barrel (212) and can move up and down, and the piston (213) divides the cylinder barrel (212) into an upper chamber (214) and a lower chamber (215); An oil port A communicated with the upper chamber (214) and an oil port B communicated with the lower chamber (215) are arranged on the cylinder barrel (212), and the oil port A and the oil port B are respectively communicated with the reversing valve (23); An upper chamber spring (216) is arranged inside the upper chamber (214), and both ends of the upper chamber spring (216) are respectively connected with the upper part of the piston (213) and the inner top wall of the cylinder barrel (212); a lower chamber spring (217) is arranged inside the lower chamber (215), and both ends of the lower chamber spring (217) are respectively connected with the lower part of the piston (213) and the inner bottom wall of the cylinder barrel (212), and the piston rod (211) extends out of the cylinder barrel (212) after passing through the lower chamber spring (217). When the hydraulic pressures in the upper chamber (214) and the lower chamber (215) are equal, the piston (213) is in the initial position under the combined action of the upper chamber spring (216) and the lower chamber spring (217). When the piston (213) is in the initial position, the piston rod (211) is inserted into the water outlet (221). When hydraulic oil enters the lower chamber (215) from the oil port B, and at the same time the hydraulic oil in the upper chamber (214) flows out from the oil port A, the hydraulic oil overcomes the pressure of the upper chamber spring (216) and pushes the piston (213) together with the piston rod (211) to move upward. The piston rod (211) is pulled out from the water outlet (221), and the water in the water spraying box (22) is sprayed into the inner side of the rotor cover (1) successively through the water outlet (221), the through hole (11) and the push plate through hole (31). When hydraulic oil enters the upper chamber (214) from the oil port A, and at the same time the hydraulic oil in the lower chamber (215) flows out from the oil port B, the hydraulic oil overcomes the pressure of the lower chamber spring (217) and pushes the piston (213) together with the piston rod (211) to move downward. The piston rod (211) passes through the water outlet (221) and pushes the push plate (3) to move downward.

4. The water spraying device for an asphalt pavement cold recycling machine with a self-cleaning function according to claim 3, characterized in that: the reversing valve (23) is controlled by the controller (5), a pressure sensor (6) is arranged in the water spraying box (22), and the signal of the pressure sensor (6) is transmitted to the controller (5).

5. The water spraying device for an asphalt pavement cold recycling machine with a self-cleaning function according to claim 3, characterized in that: the reversing valve (23) is controlled by the controller (5), a flow sensor (7) is arranged at the water inlet of the water spraying box (22), and the signal of the flow sensor (7) is transmitted to the controller (5).

6. The water spraying device for an asphalt pavement cold recycling machine with a self-cleaning function according to claim 3, characterized in that: the reversing valve (23) is controlled by the controller (5), a pressure sensor (6) is arranged in the water spraying box (22), and the signal of the pressure sensor (6) is transmitted to the controller (5); a flow sensor (7) is arranged at the water inlet of the water spraying box (22), and the signal of the flow sensor (7) is transmitted to the controller (5).

7. The water spraying device for an asphalt pavement cold recycling machine with a self-cleaning function according to claim 4 or 5 or 6, characterized in that: the water spraying boxes (22) are independently installed above the rotor cover (1), and at least two water spraying oil cylinders (21) are installed on the water spraying boxes (22).

8. The water spraying device for an asphalt pavement cold recycling machine with a self-cleaning function according to claim 6, characterized in that: a connecting plate (8) is arranged between adjacent push plates (3) driven by the water spraying oil cylinders (21) on the same water spraying box (22).

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